Merge pull request #11229 from anlancs/fix/zebra-nb-remove-checknode

[mirror_frr.git] / zebra / zebra_dplane.c

/*
 * Zebra dataplane layer.
 * Copyright (c) 2018 Volta Networks, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "lib/libfrr.h"
#include "lib/debug.h"
#include "lib/frratomic.h"
#include "lib/frr_pthread.h"
#include "lib/memory.h"
#include "lib/queue.h"
#include "lib/zebra.h"
#include "zebra/netconf_netlink.h"
#include "zebra/zebra_router.h"
#include "zebra/zebra_dplane.h"
#include "zebra/zebra_vxlan_private.h"
#include "zebra/zebra_mpls.h"
#include "zebra/rt.h"
#include "zebra/debug.h"
#include "zebra/zebra_pbr.h"
#include "printfrr.h"

/* Memory types */
DEFINE_MTYPE_STATIC(ZEBRA, DP_CTX, "Zebra DPlane Ctx");
DEFINE_MTYPE_STATIC(ZEBRA, DP_INTF, "Zebra DPlane Intf");
DEFINE_MTYPE_STATIC(ZEBRA, DP_PROV, "Zebra DPlane Provider");
DEFINE_MTYPE_STATIC(ZEBRA, DP_NETFILTER, "Zebra Netfilter Internal Object");
DEFINE_MTYPE_STATIC(ZEBRA, DP_NS, "DPlane NSes");

#ifndef AOK
#  define AOK 0
#endif

/* Control for collection of extra interface info with route updates; a plugin
 * can enable the extra info via a dplane api.
 */
static bool dplane_collect_extra_intf_info;

/* Enable test dataplane provider */
/*#define DPLANE_TEST_PROVIDER 1 */

/* Default value for max queued incoming updates */
const uint32_t DPLANE_DEFAULT_MAX_QUEUED = 200;

/* Default value for new work per cycle */
const uint32_t DPLANE_DEFAULT_NEW_WORK = 100;

/* Validation check macro for context blocks */
/* #define DPLANE_DEBUG 1 */

#ifdef DPLANE_DEBUG

#  define DPLANE_CTX_VALID(p)   \
                assert((p) != NULL)

#else

#  define DPLANE_CTX_VALID(p)

#endif  /* DPLANE_DEBUG */

/*
 * Nexthop information captured for nexthop/nexthop group updates
 */
struct dplane_nexthop_info {
        uint32_t id;
        uint32_t old_id;
        afi_t afi;
        vrf_id_t vrf_id;
        int type;

        struct nexthop_group ng;
        struct nh_grp nh_grp[MULTIPATH_NUM];
        uint8_t nh_grp_count;
};

/*
 * Optional extra info about interfaces used in route updates' nexthops.
 */
struct dplane_intf_extra {
        vrf_id_t vrf_id;
        uint32_t ifindex;
        uint32_t flags;
        uint32_t status;

        TAILQ_ENTRY(dplane_intf_extra) link;
};

/*
 * Route information captured for route updates.
 */
struct dplane_route_info {

        /* Dest and (optional) source prefixes */
        struct prefix zd_dest;
        struct prefix zd_src;

        afi_t zd_afi;
        safi_t zd_safi;

        int zd_type;
        int zd_old_type;

        route_tag_t zd_tag;
        route_tag_t zd_old_tag;
        uint32_t zd_metric;
        uint32_t zd_old_metric;

        uint16_t zd_instance;
        uint16_t zd_old_instance;

        uint8_t zd_distance;
        uint8_t zd_old_distance;

        uint32_t zd_mtu;
        uint32_t zd_nexthop_mtu;

        /* Nexthop hash entry info */
        struct dplane_nexthop_info nhe;

        /* Nexthops */
        uint32_t zd_nhg_id;
        struct nexthop_group zd_ng;

        /* Backup nexthops (if present) */
        struct nexthop_group backup_ng;

        /* "Previous" nexthops, used only in route updates without netlink */
        struct nexthop_group zd_old_ng;
        struct nexthop_group old_backup_ng;

        /* Optional list of extra interface info */
        TAILQ_HEAD(dp_intf_extra_q, dplane_intf_extra) intf_extra_q;
};

/*
 * Pseudowire info for the dataplane
 */
struct dplane_pw_info {
        int type;
        int af;
        int status;
        uint32_t flags;
        uint32_t nhg_id;
        union g_addr dest;
        mpls_label_t local_label;
        mpls_label_t remote_label;

        /* Nexthops that are valid and installed */
        struct nexthop_group fib_nhg;

        /* Primary and backup nexthop sets, copied from the resolving route. */
        struct nexthop_group primary_nhg;
        struct nexthop_group backup_nhg;

        union pw_protocol_fields fields;
};

/*
 * Bridge port info for the dataplane
 */
struct dplane_br_port_info {
        uint32_t sph_filter_cnt;
        struct in_addr sph_filters[ES_VTEP_MAX_CNT];
        /* DPLANE_BR_PORT_XXX - see zebra_dplane.h*/
        uint32_t flags;
        uint32_t backup_nhg_id;
};

/*
 * Interface/prefix info for the dataplane
 */
struct dplane_intf_info {

        uint32_t metric;
        uint32_t flags;

        bool protodown;
        bool pd_reason_val;

#define DPLANE_INTF_CONNECTED   (1 << 0) /* Connected peer, p2p */
#define DPLANE_INTF_SECONDARY   (1 << 1)
#define DPLANE_INTF_BROADCAST   (1 << 2)
#define DPLANE_INTF_HAS_DEST    DPLANE_INTF_CONNECTED
#define DPLANE_INTF_HAS_LABEL   (1 << 4)

        /* Interface address/prefix */
        struct prefix prefix;

        /* Dest address, for p2p, or broadcast prefix */
        struct prefix dest_prefix;

        char *label;
        char label_buf[32];
};

/*
 * EVPN MAC address info for the dataplane.
 */
struct dplane_mac_info {
        vlanid_t vid;
        ifindex_t br_ifindex;
        struct ethaddr mac;
        struct in_addr vtep_ip;
        bool is_sticky;
        uint32_t nhg_id;
        uint32_t update_flags;
};

/*
 * Neighbor info for the dataplane
 */
struct dplane_neigh_info {
        struct ipaddr ip_addr;
        union {
                struct ethaddr mac;
                struct ipaddr ip_addr;
        } link;
        uint32_t flags;
        uint16_t state;
        uint32_t update_flags;
};

/*
 * Neighbor Table
 */
struct dplane_neigh_table {
        uint8_t family;
        uint32_t app_probes;
        uint32_t ucast_probes;
        uint32_t mcast_probes;
};

/*
 * Policy based routing rule info for the dataplane
 */
struct dplane_ctx_rule {
        uint32_t priority;

        /* The route table pointed by this rule */
        uint32_t table;

        /* Filter criteria */
        uint32_t filter_bm;
        uint32_t fwmark;
        uint8_t dsfield;
        struct prefix src_ip;
        struct prefix dst_ip;
        uint8_t ip_proto;

        uint8_t action_pcp;
        uint16_t action_vlan_id;
        uint16_t action_vlan_flags;

        uint32_t action_queue_id;

        char ifname[INTERFACE_NAMSIZ + 1];
};

struct dplane_rule_info {
        /*
         * Originating zclient sock fd, so we can know who to send
         * back to.
         */
        int sock;

        int unique;
        int seq;

        struct dplane_ctx_rule new;
        struct dplane_ctx_rule old;
};

struct dplane_gre_ctx {
        uint32_t link_ifindex;
        unsigned int mtu;
        struct zebra_l2info_gre info;
};


/*
 * Network interface configuration info - aligned with netlink's NETCONF
 * info. The flags values are public, in the dplane.h file...
 */
struct dplane_netconf_info {
        ns_id_t ns_id;
        ifindex_t ifindex;
        enum dplane_netconf_status_e mpls_val;
        enum dplane_netconf_status_e mcast_val;
};

/*
 * The context block used to exchange info about route updates across
 * the boundary between the zebra main context (and pthread) and the
 * dataplane layer (and pthread).
 */
struct zebra_dplane_ctx {

        /* Operation code */
        enum dplane_op_e zd_op;

        /* Status on return */
        enum zebra_dplane_result zd_status;

        /* Dplane provider id */
        uint32_t zd_provider;

        /* Flags - used by providers, e.g. */
        int zd_flags;

        bool zd_is_update;

        uint32_t zd_seq;
        uint32_t zd_old_seq;

        /* Some updates may be generated by notifications: allow the
         * plugin to notice and ignore results from its own notifications.
         */
        uint32_t zd_notif_provider;

        /* TODO -- internal/sub-operation status? */
        enum zebra_dplane_result zd_remote_status;
        enum zebra_dplane_result zd_kernel_status;

        vrf_id_t zd_vrf_id;
        uint32_t zd_table_id;

        char zd_ifname[INTERFACE_NAMSIZ];
        ifindex_t zd_ifindex;

        /* Support info for different kinds of updates */
        union {
                struct dplane_route_info rinfo;
                struct zebra_lsp lsp;
                struct dplane_pw_info pw;
                struct dplane_br_port_info br_port;
                struct dplane_intf_info intf;
                struct dplane_mac_info macinfo;
                struct dplane_neigh_info neigh;
                struct dplane_rule_info rule;
                struct zebra_pbr_iptable iptable;
                struct zebra_pbr_ipset ipset;
                struct {
                        struct zebra_pbr_ipset_entry entry;
                        struct zebra_pbr_ipset_info info;
                } ipset_entry;
                struct dplane_neigh_table neightable;
                struct dplane_gre_ctx gre;
                struct dplane_netconf_info netconf;
        } u;

        /* Namespace info, used especially for netlink kernel communication */
        struct zebra_dplane_info zd_ns_info;

        /* Embedded list linkage */
        TAILQ_ENTRY(zebra_dplane_ctx) zd_q_entries;
};

/* Flag that can be set by a pre-kernel provider as a signal that an update
 * should bypass the kernel.
 */
#define DPLANE_CTX_FLAG_NO_KERNEL 0x01


/*
 * Registration block for one dataplane provider.
 */
struct zebra_dplane_provider {
        /* Name */
        char dp_name[DPLANE_PROVIDER_NAMELEN + 1];

        /* Priority, for ordering among providers */
        uint8_t dp_priority;

        /* Id value */
        uint32_t dp_id;

        /* Mutex */
        pthread_mutex_t dp_mutex;

        /* Plugin-provided extra data */
        void *dp_data;

        /* Flags */
        int dp_flags;

        int (*dp_start)(struct zebra_dplane_provider *prov);

        int (*dp_fp)(struct zebra_dplane_provider *prov);

        int (*dp_fini)(struct zebra_dplane_provider *prov, bool early_p);

        _Atomic uint32_t dp_in_counter;
        _Atomic uint32_t dp_in_queued;
        _Atomic uint32_t dp_in_max;
        _Atomic uint32_t dp_out_counter;
        _Atomic uint32_t dp_out_queued;
        _Atomic uint32_t dp_out_max;
        _Atomic uint32_t dp_error_counter;

        /* Queue of contexts inbound to the provider */
        struct dplane_ctx_q dp_ctx_in_q;

        /* Queue of completed contexts outbound from the provider back
         * towards the dataplane module.
         */
        struct dplane_ctx_q dp_ctx_out_q;

        /* Embedded list linkage for provider objects */
        TAILQ_ENTRY(zebra_dplane_provider) dp_prov_link;
};

/* Declare types for list of zns info objects */
PREDECL_DLIST(zns_info_list);

struct dplane_zns_info {
        struct zebra_dplane_info info;

        /* Request data from the OS */
        struct thread *t_request;

        /* Read event */
        struct thread *t_read;

        /* List linkage */
        struct zns_info_list_item link;
};

/*
 * Globals
 */
static struct zebra_dplane_globals {
        /* Mutex to control access to dataplane components */
        pthread_mutex_t dg_mutex;

        /* Results callback registered by zebra 'core' */
        int (*dg_results_cb)(struct dplane_ctx_q *ctxlist);

        /* Sentinel for beginning of shutdown */
        volatile bool dg_is_shutdown;

        /* Sentinel for end of shutdown */
        volatile bool dg_run;

        /* Update context queue inbound to the dataplane */
        TAILQ_HEAD(zdg_ctx_q, zebra_dplane_ctx) dg_update_ctx_q;

        /* Ordered list of providers */
        TAILQ_HEAD(zdg_prov_q, zebra_dplane_provider) dg_providers_q;

        /* List of info about each zns */
        struct zns_info_list_head dg_zns_list;

        /* Counter used to assign internal ids to providers */
        uint32_t dg_provider_id;

        /* Limit number of pending, unprocessed updates */
        _Atomic uint32_t dg_max_queued_updates;

        /* Control whether system route notifications should be produced. */
        bool dg_sys_route_notifs;

        /* Limit number of new updates dequeued at once, to pace an
         * incoming burst.
         */
        uint32_t dg_updates_per_cycle;

        _Atomic uint32_t dg_routes_in;
        _Atomic uint32_t dg_routes_queued;
        _Atomic uint32_t dg_routes_queued_max;
        _Atomic uint32_t dg_route_errors;
        _Atomic uint32_t dg_other_errors;

        _Atomic uint32_t dg_nexthops_in;
        _Atomic uint32_t dg_nexthop_errors;

        _Atomic uint32_t dg_lsps_in;
        _Atomic uint32_t dg_lsp_errors;

        _Atomic uint32_t dg_pws_in;
        _Atomic uint32_t dg_pw_errors;

        _Atomic uint32_t dg_br_port_in;
        _Atomic uint32_t dg_br_port_errors;

        _Atomic uint32_t dg_intf_addrs_in;
        _Atomic uint32_t dg_intf_addr_errors;

        _Atomic uint32_t dg_macs_in;
        _Atomic uint32_t dg_mac_errors;

        _Atomic uint32_t dg_neighs_in;
        _Atomic uint32_t dg_neigh_errors;

        _Atomic uint32_t dg_rules_in;
        _Atomic uint32_t dg_rule_errors;

        _Atomic uint32_t dg_update_yields;

        _Atomic uint32_t dg_iptable_in;
        _Atomic uint32_t dg_iptable_errors;

        _Atomic uint32_t dg_ipset_in;
        _Atomic uint32_t dg_ipset_errors;
        _Atomic uint32_t dg_ipset_entry_in;
        _Atomic uint32_t dg_ipset_entry_errors;

        _Atomic uint32_t dg_neightable_in;
        _Atomic uint32_t dg_neightable_errors;

        _Atomic uint32_t dg_gre_set_in;
        _Atomic uint32_t dg_gre_set_errors;

        _Atomic uint32_t dg_intfs_in;
        _Atomic uint32_t dg_intf_errors;

        /* Dataplane pthread */
        struct frr_pthread *dg_pthread;

        /* Event-delivery context 'master' for the dplane */
        struct thread_master *dg_master;

        /* Event/'thread' pointer for queued updates */
        struct thread *dg_t_update;

        /* Event pointer for pending shutdown check loop */
        struct thread *dg_t_shutdown_check;

} zdplane_info;

/* Instantiate zns list type */
DECLARE_DLIST(zns_info_list, struct dplane_zns_info, link);

/*
 * Lock and unlock for interactions with the zebra 'core' pthread
 */
#define DPLANE_LOCK() pthread_mutex_lock(&zdplane_info.dg_mutex)
#define DPLANE_UNLOCK() pthread_mutex_unlock(&zdplane_info.dg_mutex)


/*
 * Lock and unlock for individual providers
 */
#define DPLANE_PROV_LOCK(p)   pthread_mutex_lock(&((p)->dp_mutex))
#define DPLANE_PROV_UNLOCK(p) pthread_mutex_unlock(&((p)->dp_mutex))

/* Prototypes */
static void dplane_thread_loop(struct thread *event);
static enum zebra_dplane_result lsp_update_internal(struct zebra_lsp *lsp,
                                                    enum dplane_op_e op);
static enum zebra_dplane_result pw_update_internal(struct zebra_pw *pw,
                                                   enum dplane_op_e op);
static enum zebra_dplane_result intf_addr_update_internal(
        const struct interface *ifp, const struct connected *ifc,
        enum dplane_op_e op);
static enum zebra_dplane_result mac_update_common(
        enum dplane_op_e op, const struct interface *ifp,
        const struct interface *br_ifp,
        vlanid_t vid, const struct ethaddr *mac,
        struct in_addr vtep_ip, bool sticky, uint32_t nhg_id,
        uint32_t update_flags);
static enum zebra_dplane_result
neigh_update_internal(enum dplane_op_e op, const struct interface *ifp,
                      const void *link, int link_family,
                      const struct ipaddr *ip, uint32_t flags, uint16_t state,
                      uint32_t update_flags, int protocol);

/*
 * Public APIs
 */

/* Obtain thread_master for dataplane thread */
struct thread_master *dplane_get_thread_master(void)
{
        return zdplane_info.dg_master;
}

/*
 * Allocate a dataplane update context
 */
struct zebra_dplane_ctx *dplane_ctx_alloc(void)
{
        struct zebra_dplane_ctx *p;

        /* TODO -- just alloc'ing memory, but would like to maintain
         * a pool
         */
        p = XCALLOC(MTYPE_DP_CTX, sizeof(struct zebra_dplane_ctx));

        return p;
}

/* Enable system route notifications */
void dplane_enable_sys_route_notifs(void)
{
        zdplane_info.dg_sys_route_notifs = true;
}

/*
 * Clean up dependent/internal allocations inside a context object
 */
static void dplane_ctx_free_internal(struct zebra_dplane_ctx *ctx)
{
        struct dplane_intf_extra *if_extra, *if_tmp;

        /*
         * Some internal allocations may need to be freed, depending on
         * the type of info captured in the ctx.
         */
        switch (ctx->zd_op) {
        case DPLANE_OP_ROUTE_INSTALL:
        case DPLANE_OP_ROUTE_UPDATE:
        case DPLANE_OP_ROUTE_DELETE:
        case DPLANE_OP_SYS_ROUTE_ADD:
        case DPLANE_OP_SYS_ROUTE_DELETE:
        case DPLANE_OP_ROUTE_NOTIFY:

                /* Free allocated nexthops */
                if (ctx->u.rinfo.zd_ng.nexthop) {
                        /* This deals with recursive nexthops too */
                        nexthops_free(ctx->u.rinfo.zd_ng.nexthop);

                        ctx->u.rinfo.zd_ng.nexthop = NULL;
                }

                /* Free backup info also (if present) */
                if (ctx->u.rinfo.backup_ng.nexthop) {
                        /* This deals with recursive nexthops too */
                        nexthops_free(ctx->u.rinfo.backup_ng.nexthop);

                        ctx->u.rinfo.backup_ng.nexthop = NULL;
                }

                if (ctx->u.rinfo.zd_old_ng.nexthop) {
                        /* This deals with recursive nexthops too */
                        nexthops_free(ctx->u.rinfo.zd_old_ng.nexthop);

                        ctx->u.rinfo.zd_old_ng.nexthop = NULL;
                }

                if (ctx->u.rinfo.old_backup_ng.nexthop) {
                        /* This deals with recursive nexthops too */
                        nexthops_free(ctx->u.rinfo.old_backup_ng.nexthop);

                        ctx->u.rinfo.old_backup_ng.nexthop = NULL;
                }

                /* Optional extra interface info */
                TAILQ_FOREACH_SAFE(if_extra, &ctx->u.rinfo.intf_extra_q,
                                   link, if_tmp) {
                        TAILQ_REMOVE(&ctx->u.rinfo.intf_extra_q, if_extra,
                                     link);
                        XFREE(MTYPE_DP_INTF, if_extra);
                }

                break;

        case DPLANE_OP_NH_INSTALL:
        case DPLANE_OP_NH_UPDATE:
        case DPLANE_OP_NH_DELETE: {
                if (ctx->u.rinfo.nhe.ng.nexthop) {
                        /* This deals with recursive nexthops too */
                        nexthops_free(ctx->u.rinfo.nhe.ng.nexthop);

                        ctx->u.rinfo.nhe.ng.nexthop = NULL;
                }
                break;
        }

        case DPLANE_OP_LSP_INSTALL:
        case DPLANE_OP_LSP_UPDATE:
        case DPLANE_OP_LSP_DELETE:
        case DPLANE_OP_LSP_NOTIFY:
        {
                struct zebra_nhlfe *nhlfe;

                /* Unlink and free allocated NHLFEs */
                frr_each_safe(nhlfe_list, &ctx->u.lsp.nhlfe_list, nhlfe) {
                        nhlfe_list_del(&ctx->u.lsp.nhlfe_list, nhlfe);
                        zebra_mpls_nhlfe_free(nhlfe);
                }

                /* Unlink and free allocated backup NHLFEs, if present */
                frr_each_safe(nhlfe_list,
                              &(ctx->u.lsp.backup_nhlfe_list), nhlfe) {
                        nhlfe_list_del(&ctx->u.lsp.backup_nhlfe_list,
                                       nhlfe);
                        zebra_mpls_nhlfe_free(nhlfe);
                }

                /* Clear pointers in lsp struct, in case we're caching
                 * free context structs.
                 */
                nhlfe_list_init(&ctx->u.lsp.nhlfe_list);
                ctx->u.lsp.best_nhlfe = NULL;
                nhlfe_list_init(&ctx->u.lsp.backup_nhlfe_list);

                break;
        }

        case DPLANE_OP_PW_INSTALL:
        case DPLANE_OP_PW_UNINSTALL:
                /* Free allocated nexthops */
                if (ctx->u.pw.fib_nhg.nexthop) {
                        /* This deals with recursive nexthops too */
                        nexthops_free(ctx->u.pw.fib_nhg.nexthop);

                        ctx->u.pw.fib_nhg.nexthop = NULL;
                }
                if (ctx->u.pw.primary_nhg.nexthop) {
                        nexthops_free(ctx->u.pw.primary_nhg.nexthop);

                        ctx->u.pw.primary_nhg.nexthop = NULL;
                }
                if (ctx->u.pw.backup_nhg.nexthop) {
                        nexthops_free(ctx->u.pw.backup_nhg.nexthop);

                        ctx->u.pw.backup_nhg.nexthop = NULL;
                }
                break;

        case DPLANE_OP_ADDR_INSTALL:
        case DPLANE_OP_ADDR_UNINSTALL:
        case DPLANE_OP_INTF_ADDR_ADD:
        case DPLANE_OP_INTF_ADDR_DEL:
                /* Maybe free label string, if allocated */
                if (ctx->u.intf.label != NULL &&
                    ctx->u.intf.label != ctx->u.intf.label_buf) {
                        XFREE(MTYPE_DP_CTX, ctx->u.intf.label);
                        ctx->u.intf.label = NULL;
                }
                break;

        case DPLANE_OP_MAC_INSTALL:
        case DPLANE_OP_MAC_DELETE:
        case DPLANE_OP_NEIGH_INSTALL:
        case DPLANE_OP_NEIGH_UPDATE:
        case DPLANE_OP_NEIGH_DELETE:
        case DPLANE_OP_VTEP_ADD:
        case DPLANE_OP_VTEP_DELETE:
        case DPLANE_OP_RULE_ADD:
        case DPLANE_OP_RULE_DELETE:
        case DPLANE_OP_RULE_UPDATE:
        case DPLANE_OP_NEIGH_DISCOVER:
        case DPLANE_OP_BR_PORT_UPDATE:
        case DPLANE_OP_NEIGH_IP_INSTALL:
        case DPLANE_OP_NEIGH_IP_DELETE:
        case DPLANE_OP_NONE:
        case DPLANE_OP_IPSET_ADD:
        case DPLANE_OP_IPSET_DELETE:
        case DPLANE_OP_INTF_INSTALL:
        case DPLANE_OP_INTF_UPDATE:
        case DPLANE_OP_INTF_DELETE:
                break;

        case DPLANE_OP_IPSET_ENTRY_ADD:
        case DPLANE_OP_IPSET_ENTRY_DELETE:
                break;
        case DPLANE_OP_NEIGH_TABLE_UPDATE:
                break;
        case DPLANE_OP_IPTABLE_ADD:
        case DPLANE_OP_IPTABLE_DELETE:
                if (ctx->u.iptable.interface_name_list) {
                        struct listnode *node, *nnode;
                        char *ifname;

                        for (ALL_LIST_ELEMENTS(
                                     ctx->u.iptable.interface_name_list, node,
                                     nnode, ifname)) {
                                LISTNODE_DETACH(
                                        ctx->u.iptable.interface_name_list,
                                        node);
                                XFREE(MTYPE_DP_NETFILTER, ifname);
                        }
                        list_delete(&ctx->u.iptable.interface_name_list);
                }
                break;
        case DPLANE_OP_GRE_SET:
        case DPLANE_OP_INTF_NETCONFIG:
                break;
        }
}

/*
 * Free a dataplane results context.
 */
static void dplane_ctx_free(struct zebra_dplane_ctx **pctx)
{
        if (pctx == NULL)
                return;

        DPLANE_CTX_VALID(*pctx);

        /* TODO -- just freeing memory, but would like to maintain
         * a pool
         */

        /* Some internal allocations may need to be freed, depending on
         * the type of info captured in the ctx.
         */
        dplane_ctx_free_internal(*pctx);

        XFREE(MTYPE_DP_CTX, *pctx);
}

/*
 * Reset an allocated context object for re-use. All internal allocations are
 * freed and the context is memset.
 */
void dplane_ctx_reset(struct zebra_dplane_ctx *ctx)
{
        dplane_ctx_free_internal(ctx);
        memset(ctx, 0, sizeof(*ctx));
}

/*
 * Return a context block to the dplane module after processing
 */
void dplane_ctx_fini(struct zebra_dplane_ctx **pctx)
{
        /* TODO -- maintain pool; for now, just free */
        dplane_ctx_free(pctx);
}

/* Enqueue a context block */
void dplane_ctx_enqueue_tail(struct dplane_ctx_q *q,
                             const struct zebra_dplane_ctx *ctx)
{
        TAILQ_INSERT_TAIL(q, (struct zebra_dplane_ctx *)ctx, zd_q_entries);
}

/* Append a list of context blocks to another list */
void dplane_ctx_list_append(struct dplane_ctx_q *to_list,
                            struct dplane_ctx_q *from_list)
{
        if (TAILQ_FIRST(from_list)) {
                TAILQ_CONCAT(to_list, from_list, zd_q_entries);

                /* And clear 'from' list */
                TAILQ_INIT(from_list);
        }
}

struct zebra_dplane_ctx *dplane_ctx_get_head(struct dplane_ctx_q *q)
{
        struct zebra_dplane_ctx *ctx = TAILQ_FIRST(q);

        return ctx;
}

/* Dequeue a context block from the head of a list */
struct zebra_dplane_ctx *dplane_ctx_dequeue(struct dplane_ctx_q *q)
{
        struct zebra_dplane_ctx *ctx = TAILQ_FIRST(q);

        if (ctx)
                TAILQ_REMOVE(q, ctx, zd_q_entries);

        return ctx;
}

/*
 * Accessors for information from the context object
 */
enum zebra_dplane_result dplane_ctx_get_status(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_status;
}

void dplane_ctx_set_status(struct zebra_dplane_ctx *ctx,
                           enum zebra_dplane_result status)
{
        DPLANE_CTX_VALID(ctx);

        ctx->zd_status = status;
}

/* Retrieve last/current provider id */
uint32_t dplane_ctx_get_provider(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->zd_provider;
}

/* Providers run before the kernel can control whether a kernel
 * update should be done.
 */
void dplane_ctx_set_skip_kernel(struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        SET_FLAG(ctx->zd_flags, DPLANE_CTX_FLAG_NO_KERNEL);
}

bool dplane_ctx_is_skip_kernel(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return CHECK_FLAG(ctx->zd_flags, DPLANE_CTX_FLAG_NO_KERNEL);
}

void dplane_ctx_set_op(struct zebra_dplane_ctx *ctx, enum dplane_op_e op)
{
        DPLANE_CTX_VALID(ctx);
        ctx->zd_op = op;
}

enum dplane_op_e dplane_ctx_get_op(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_op;
}

const char *dplane_op2str(enum dplane_op_e op)
{
        const char *ret = "UNKNOWN";

        switch (op) {
        case DPLANE_OP_NONE:
                ret = "NONE";
                break;

        /* Route update */
        case DPLANE_OP_ROUTE_INSTALL:
                ret = "ROUTE_INSTALL";
                break;
        case DPLANE_OP_ROUTE_UPDATE:
                ret = "ROUTE_UPDATE";
                break;
        case DPLANE_OP_ROUTE_DELETE:
                ret = "ROUTE_DELETE";
                break;
        case DPLANE_OP_ROUTE_NOTIFY:
                ret = "ROUTE_NOTIFY";
                break;

        /* Nexthop update */
        case DPLANE_OP_NH_INSTALL:
                ret = "NH_INSTALL";
                break;
        case DPLANE_OP_NH_UPDATE:
                ret = "NH_UPDATE";
                break;
        case DPLANE_OP_NH_DELETE:
                ret = "NH_DELETE";
                break;

        case DPLANE_OP_LSP_INSTALL:
                ret = "LSP_INSTALL";
                break;
        case DPLANE_OP_LSP_UPDATE:
                ret = "LSP_UPDATE";
                break;
        case DPLANE_OP_LSP_DELETE:
                ret = "LSP_DELETE";
                break;
        case DPLANE_OP_LSP_NOTIFY:
                ret = "LSP_NOTIFY";
                break;

        case DPLANE_OP_PW_INSTALL:
                ret = "PW_INSTALL";
                break;
        case DPLANE_OP_PW_UNINSTALL:
                ret = "PW_UNINSTALL";
                break;

        case DPLANE_OP_SYS_ROUTE_ADD:
                ret = "SYS_ROUTE_ADD";
                break;
        case DPLANE_OP_SYS_ROUTE_DELETE:
                ret = "SYS_ROUTE_DEL";
                break;

        case DPLANE_OP_BR_PORT_UPDATE:
                ret = "BR_PORT_UPDATE";
                break;

        case DPLANE_OP_ADDR_INSTALL:
                ret = "ADDR_INSTALL";
                break;
        case DPLANE_OP_ADDR_UNINSTALL:
                ret = "ADDR_UNINSTALL";
                break;

        case DPLANE_OP_MAC_INSTALL:
                ret = "MAC_INSTALL";
                break;
        case DPLANE_OP_MAC_DELETE:
                ret = "MAC_DELETE";
                break;

        case DPLANE_OP_NEIGH_INSTALL:
                ret = "NEIGH_INSTALL";
                break;
        case DPLANE_OP_NEIGH_UPDATE:
                ret = "NEIGH_UPDATE";
                break;
        case DPLANE_OP_NEIGH_DELETE:
                ret = "NEIGH_DELETE";
                break;
        case DPLANE_OP_VTEP_ADD:
                ret = "VTEP_ADD";
                break;
        case DPLANE_OP_VTEP_DELETE:
                ret = "VTEP_DELETE";
                break;

        case DPLANE_OP_RULE_ADD:
                ret = "RULE_ADD";
                break;
        case DPLANE_OP_RULE_DELETE:
                ret = "RULE_DELETE";
                break;
        case DPLANE_OP_RULE_UPDATE:
                ret = "RULE_UPDATE";
                break;

        case DPLANE_OP_NEIGH_DISCOVER:
                ret = "NEIGH_DISCOVER";
                break;

        case DPLANE_OP_IPTABLE_ADD:
                ret = "IPTABLE_ADD";
                break;
        case DPLANE_OP_IPTABLE_DELETE:
                ret = "IPTABLE_DELETE";
                break;
        case DPLANE_OP_IPSET_ADD:
                ret = "IPSET_ADD";
                break;
        case DPLANE_OP_IPSET_DELETE:
                ret = "IPSET_DELETE";
                break;
        case DPLANE_OP_IPSET_ENTRY_ADD:
                ret = "IPSET_ENTRY_ADD";
                break;
        case DPLANE_OP_IPSET_ENTRY_DELETE:
                ret = "IPSET_ENTRY_DELETE";
                break;
        case DPLANE_OP_NEIGH_IP_INSTALL:
                ret = "NEIGH_IP_INSTALL";
                break;
        case DPLANE_OP_NEIGH_IP_DELETE:
                ret = "NEIGH_IP_DELETE";
                break;
        case DPLANE_OP_NEIGH_TABLE_UPDATE:
                ret = "NEIGH_TABLE_UPDATE";
                break;

        case DPLANE_OP_GRE_SET:
                ret = "GRE_SET";
                break;

        case DPLANE_OP_INTF_ADDR_ADD:
                return "INTF_ADDR_ADD";

        case DPLANE_OP_INTF_ADDR_DEL:
                return "INTF_ADDR_DEL";

        case DPLANE_OP_INTF_NETCONFIG:
                return "INTF_NETCONFIG";

        case DPLANE_OP_INTF_INSTALL:
                ret = "INTF_INSTALL";
                break;
        case DPLANE_OP_INTF_UPDATE:
                ret = "INTF_UPDATE";
                break;
        case DPLANE_OP_INTF_DELETE:
                ret = "INTF_DELETE";
                break;
        }

        return ret;
}

const char *dplane_res2str(enum zebra_dplane_result res)
{
        const char *ret = "<Unknown>";

        switch (res) {
        case ZEBRA_DPLANE_REQUEST_FAILURE:
                ret = "FAILURE";
                break;
        case ZEBRA_DPLANE_REQUEST_QUEUED:
                ret = "QUEUED";
                break;
        case ZEBRA_DPLANE_REQUEST_SUCCESS:
                ret = "SUCCESS";
                break;
        }

        return ret;
}

void dplane_ctx_set_dest(struct zebra_dplane_ctx *ctx,
                         const struct prefix *dest)
{
        DPLANE_CTX_VALID(ctx);

        prefix_copy(&(ctx->u.rinfo.zd_dest), dest);
}

const struct prefix *dplane_ctx_get_dest(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rinfo.zd_dest);
}

void dplane_ctx_set_src(struct zebra_dplane_ctx *ctx, const struct prefix *src)
{
        DPLANE_CTX_VALID(ctx);

        if (src)
                prefix_copy(&(ctx->u.rinfo.zd_src), src);
        else
                memset(&(ctx->u.rinfo.zd_src), 0, sizeof(struct prefix));
}

/* Source prefix is a little special - return NULL for "no src prefix" */
const struct prefix *dplane_ctx_get_src(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        if (ctx->u.rinfo.zd_src.prefixlen == 0 &&
            IN6_IS_ADDR_UNSPECIFIED(&(ctx->u.rinfo.zd_src.u.prefix6))) {
                return NULL;
        } else {
                return &(ctx->u.rinfo.zd_src);
        }
}

bool dplane_ctx_is_update(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_is_update;
}

uint32_t dplane_ctx_get_seq(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_seq;
}

uint32_t dplane_ctx_get_old_seq(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_old_seq;
}

void dplane_ctx_set_vrf(struct zebra_dplane_ctx *ctx, vrf_id_t vrf)
{
        DPLANE_CTX_VALID(ctx);

        ctx->zd_vrf_id = vrf;
}

vrf_id_t dplane_ctx_get_vrf(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_vrf_id;
}

/* In some paths we have only a namespace id */
void dplane_ctx_set_ns_id(struct zebra_dplane_ctx *ctx, ns_id_t nsid)
{
        DPLANE_CTX_VALID(ctx);

        ctx->zd_ns_info.ns_id = nsid;
}

ns_id_t dplane_ctx_get_ns_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_ns_info.ns_id;
}

bool dplane_ctx_is_from_notif(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return (ctx->zd_notif_provider != 0);
}

uint32_t dplane_ctx_get_notif_provider(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_notif_provider;
}

void dplane_ctx_set_notif_provider(struct zebra_dplane_ctx *ctx,
                                       uint32_t id)
{
        DPLANE_CTX_VALID(ctx);

        ctx->zd_notif_provider = id;
}

const char *dplane_ctx_get_ifname(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_ifname;
}

void dplane_ctx_set_ifname(struct zebra_dplane_ctx *ctx, const char *ifname)
{
        DPLANE_CTX_VALID(ctx);

        if (!ifname)
                return;

        strlcpy(ctx->zd_ifname, ifname, sizeof(ctx->zd_ifname));
}

ifindex_t dplane_ctx_get_ifindex(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_ifindex;
}

void dplane_ctx_set_ifindex(struct zebra_dplane_ctx *ctx, ifindex_t ifindex)
{
        DPLANE_CTX_VALID(ctx);

        ctx->zd_ifindex = ifindex;
}

void dplane_ctx_set_type(struct zebra_dplane_ctx *ctx, int type)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.rinfo.zd_type = type;
}

int dplane_ctx_get_type(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_type;
}

int dplane_ctx_get_old_type(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_old_type;
}

void dplane_ctx_set_afi(struct zebra_dplane_ctx *ctx, afi_t afi)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.rinfo.zd_afi = afi;
}

afi_t dplane_ctx_get_afi(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_afi;
}

void dplane_ctx_set_safi(struct zebra_dplane_ctx *ctx, safi_t safi)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.rinfo.zd_safi = safi;
}

safi_t dplane_ctx_get_safi(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_safi;
}

void dplane_ctx_set_table(struct zebra_dplane_ctx *ctx, uint32_t table)
{
        DPLANE_CTX_VALID(ctx);

        ctx->zd_table_id = table;
}

uint32_t dplane_ctx_get_table(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->zd_table_id;
}

route_tag_t dplane_ctx_get_tag(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_tag;
}

void dplane_ctx_set_tag(struct zebra_dplane_ctx *ctx, route_tag_t tag)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.rinfo.zd_tag = tag;
}

route_tag_t dplane_ctx_get_old_tag(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_old_tag;
}

uint16_t dplane_ctx_get_instance(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_instance;
}

void dplane_ctx_set_instance(struct zebra_dplane_ctx *ctx, uint16_t instance)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.rinfo.zd_instance = instance;
}

uint16_t dplane_ctx_get_old_instance(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_old_instance;
}

uint32_t dplane_ctx_get_metric(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_metric;
}

uint32_t dplane_ctx_get_old_metric(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_old_metric;
}

uint32_t dplane_ctx_get_mtu(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_mtu;
}

uint32_t dplane_ctx_get_nh_mtu(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_nexthop_mtu;
}

uint8_t dplane_ctx_get_distance(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_distance;
}

void dplane_ctx_set_distance(struct zebra_dplane_ctx *ctx, uint8_t distance)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.rinfo.zd_distance = distance;
}

uint8_t dplane_ctx_get_old_distance(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rinfo.zd_old_distance;
}

/*
 * Set the nexthops associated with a context: note that processing code
 * may well expect that nexthops are in canonical (sorted) order, so we
 * will enforce that here.
 */
void dplane_ctx_set_nexthops(struct zebra_dplane_ctx *ctx, struct nexthop *nh)
{
        DPLANE_CTX_VALID(ctx);

        if (ctx->u.rinfo.zd_ng.nexthop) {
                nexthops_free(ctx->u.rinfo.zd_ng.nexthop);
                ctx->u.rinfo.zd_ng.nexthop = NULL;
        }
        nexthop_group_copy_nh_sorted(&(ctx->u.rinfo.zd_ng), nh);
}

/*
 * Set the list of backup nexthops; their ordering is preserved (they're not
 * re-sorted.)
 */
void dplane_ctx_set_backup_nhg(struct zebra_dplane_ctx *ctx,
                               const struct nexthop_group *nhg)
{
        struct nexthop *nh, *last_nh, *nexthop;

        DPLANE_CTX_VALID(ctx);

        if (ctx->u.rinfo.backup_ng.nexthop) {
                nexthops_free(ctx->u.rinfo.backup_ng.nexthop);
                ctx->u.rinfo.backup_ng.nexthop = NULL;
        }

        last_nh = NULL;

        /* Be careful to preserve the order of the backup list */
        for (nh = nhg->nexthop; nh; nh = nh->next) {
                nexthop = nexthop_dup(nh, NULL);

                if (last_nh)
                        NEXTHOP_APPEND(last_nh, nexthop);
                else
                        ctx->u.rinfo.backup_ng.nexthop = nexthop;

                last_nh = nexthop;
        }
}

uint32_t dplane_ctx_get_nhg_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.zd_nhg_id;
}

const struct nexthop_group *dplane_ctx_get_ng(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rinfo.zd_ng);
}

const struct nexthop_group *
dplane_ctx_get_backup_ng(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rinfo.backup_ng);
}

const struct nexthop_group *
dplane_ctx_get_old_ng(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rinfo.zd_old_ng);
}

const struct nexthop_group *
dplane_ctx_get_old_backup_ng(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rinfo.old_backup_ng);
}

const struct zebra_dplane_info *dplane_ctx_get_ns(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->zd_ns_info);
}

int dplane_ctx_get_ns_sock(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

#ifdef HAVE_NETLINK
        return ctx->zd_ns_info.sock;
#else
        return -1;
#endif
}

/* Accessors for nexthop information */
uint32_t dplane_ctx_get_nhe_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.id;
}

uint32_t dplane_ctx_get_old_nhe_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.old_id;
}

afi_t dplane_ctx_get_nhe_afi(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.afi;
}

vrf_id_t dplane_ctx_get_nhe_vrf_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.vrf_id;
}

int dplane_ctx_get_nhe_type(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.type;
}

const struct nexthop_group *
dplane_ctx_get_nhe_ng(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.rinfo.nhe.ng);
}

const struct nh_grp *
dplane_ctx_get_nhe_nh_grp(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.nh_grp;
}

uint8_t dplane_ctx_get_nhe_nh_grp_count(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.rinfo.nhe.nh_grp_count;
}

/* Accessors for LSP information */

mpls_label_t dplane_ctx_get_in_label(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.lsp.ile.in_label;
}

void dplane_ctx_set_in_label(struct zebra_dplane_ctx *ctx, mpls_label_t label)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.lsp.ile.in_label = label;
}

uint8_t dplane_ctx_get_addr_family(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.lsp.addr_family;
}

void dplane_ctx_set_addr_family(struct zebra_dplane_ctx *ctx,
                                uint8_t family)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.lsp.addr_family = family;
}

uint32_t dplane_ctx_get_lsp_flags(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.lsp.flags;
}

void dplane_ctx_set_lsp_flags(struct zebra_dplane_ctx *ctx,
                              uint32_t flags)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.lsp.flags = flags;
}

const struct nhlfe_list_head *dplane_ctx_get_nhlfe_list(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.lsp.nhlfe_list);
}

const struct nhlfe_list_head *dplane_ctx_get_backup_nhlfe_list(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.lsp.backup_nhlfe_list);
}

struct zebra_nhlfe *dplane_ctx_add_nhlfe(struct zebra_dplane_ctx *ctx,
                                         enum lsp_types_t lsp_type,
                                         enum nexthop_types_t nh_type,
                                         const union g_addr *gate,
                                         ifindex_t ifindex, uint8_t num_labels,
                                         mpls_label_t *out_labels)
{
        struct zebra_nhlfe *nhlfe;

        DPLANE_CTX_VALID(ctx);

        nhlfe = zebra_mpls_lsp_add_nhlfe(&(ctx->u.lsp),
                                         lsp_type, nh_type, gate,
                                         ifindex, num_labels, out_labels);

        return nhlfe;
}

struct zebra_nhlfe *dplane_ctx_add_backup_nhlfe(
        struct zebra_dplane_ctx *ctx, enum lsp_types_t lsp_type,
        enum nexthop_types_t nh_type, const union g_addr *gate,
        ifindex_t ifindex, uint8_t num_labels, mpls_label_t *out_labels)
{
        struct zebra_nhlfe *nhlfe;

        DPLANE_CTX_VALID(ctx);

        nhlfe = zebra_mpls_lsp_add_backup_nhlfe(&(ctx->u.lsp),
                                                lsp_type, nh_type, gate,
                                                ifindex, num_labels,
                                                out_labels);

        return nhlfe;
}

const struct zebra_nhlfe *
dplane_ctx_get_best_nhlfe(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.lsp.best_nhlfe;
}

const struct zebra_nhlfe *
dplane_ctx_set_best_nhlfe(struct zebra_dplane_ctx *ctx,
                          struct zebra_nhlfe *nhlfe)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.lsp.best_nhlfe = nhlfe;
        return ctx->u.lsp.best_nhlfe;
}

uint32_t dplane_ctx_get_lsp_num_ecmp(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.lsp.num_ecmp;
}

mpls_label_t dplane_ctx_get_pw_local_label(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.pw.local_label;
}

mpls_label_t dplane_ctx_get_pw_remote_label(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.pw.remote_label;
}

int dplane_ctx_get_pw_type(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.pw.type;
}

int dplane_ctx_get_pw_af(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.pw.af;
}

uint32_t dplane_ctx_get_pw_flags(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.pw.flags;
}

int dplane_ctx_get_pw_status(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.pw.status;
}

void dplane_ctx_set_pw_status(struct zebra_dplane_ctx *ctx, int status)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.pw.status = status;
}

const union g_addr *dplane_ctx_get_pw_dest(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.pw.dest);
}

const union pw_protocol_fields *dplane_ctx_get_pw_proto(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.pw.fields);
}

const struct nexthop_group *
dplane_ctx_get_pw_nhg(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.pw.fib_nhg);
}

const struct nexthop_group *
dplane_ctx_get_pw_primary_nhg(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.pw.primary_nhg);
}

const struct nexthop_group *
dplane_ctx_get_pw_backup_nhg(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.pw.backup_nhg);
}

/* Accessors for interface information */
uint32_t dplane_ctx_get_intf_metric(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.intf.metric;
}

void dplane_ctx_set_intf_metric(struct zebra_dplane_ctx *ctx, uint32_t metric)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.intf.metric = metric;
}

uint32_t dplane_ctx_get_intf_pd_reason_val(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.intf.pd_reason_val;
}

void dplane_ctx_set_intf_pd_reason_val(struct zebra_dplane_ctx *ctx, bool val)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.intf.pd_reason_val = val;
}

bool dplane_ctx_intf_is_protodown(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.intf.protodown;
}

/* Is interface addr p2p? */
bool dplane_ctx_intf_is_connected(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return (ctx->u.intf.flags & DPLANE_INTF_CONNECTED);
}

bool dplane_ctx_intf_is_secondary(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return (ctx->u.intf.flags & DPLANE_INTF_SECONDARY);
}

bool dplane_ctx_intf_is_broadcast(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return (ctx->u.intf.flags & DPLANE_INTF_BROADCAST);
}

void dplane_ctx_intf_set_connected(struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.intf.flags |= DPLANE_INTF_CONNECTED;
}

void dplane_ctx_intf_set_secondary(struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.intf.flags |= DPLANE_INTF_SECONDARY;
}

void dplane_ctx_intf_set_broadcast(struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.intf.flags |= DPLANE_INTF_BROADCAST;
}

const struct prefix *dplane_ctx_get_intf_addr(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.intf.prefix);
}

void dplane_ctx_set_intf_addr(struct zebra_dplane_ctx *ctx,
                              const struct prefix *p)
{
        DPLANE_CTX_VALID(ctx);

        prefix_copy(&(ctx->u.intf.prefix), p);
}

bool dplane_ctx_intf_has_dest(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return (ctx->u.intf.flags & DPLANE_INTF_HAS_DEST);
}

const struct prefix *dplane_ctx_get_intf_dest(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.intf.dest_prefix);
}

void dplane_ctx_set_intf_dest(struct zebra_dplane_ctx *ctx,
                              const struct prefix *p)
{
        DPLANE_CTX_VALID(ctx);

        prefix_copy(&(ctx->u.intf.dest_prefix), p);
}

bool dplane_ctx_intf_has_label(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return (ctx->u.intf.flags & DPLANE_INTF_HAS_LABEL);
}

const char *dplane_ctx_get_intf_label(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.intf.label;
}

void dplane_ctx_set_intf_label(struct zebra_dplane_ctx *ctx, const char *label)
{
        size_t len;

        DPLANE_CTX_VALID(ctx);

        if (ctx->u.intf.label && ctx->u.intf.label != ctx->u.intf.label_buf)
                XFREE(MTYPE_DP_CTX, ctx->u.intf.label);

        ctx->u.intf.label = NULL;

        if (label) {
                ctx->u.intf.flags |= DPLANE_INTF_HAS_LABEL;

                /* Use embedded buffer if it's adequate; else allocate. */
                len = strlen(label);

                if (len < sizeof(ctx->u.intf.label_buf)) {
                        strlcpy(ctx->u.intf.label_buf, label,
                                sizeof(ctx->u.intf.label_buf));
                        ctx->u.intf.label = ctx->u.intf.label_buf;
                } else {
                        ctx->u.intf.label = XSTRDUP(MTYPE_DP_CTX, label);
                }
        } else {
                ctx->u.intf.flags &= ~DPLANE_INTF_HAS_LABEL;
        }
}

/* Accessors for MAC information */
vlanid_t dplane_ctx_mac_get_vlan(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.macinfo.vid;
}

bool dplane_ctx_mac_is_sticky(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.macinfo.is_sticky;
}

uint32_t dplane_ctx_mac_get_nhg_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.macinfo.nhg_id;
}

uint32_t dplane_ctx_mac_get_update_flags(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.macinfo.update_flags;
}

const struct ethaddr *dplane_ctx_mac_get_addr(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.macinfo.mac);
}

const struct in_addr *dplane_ctx_mac_get_vtep_ip(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.macinfo.vtep_ip);
}

ifindex_t dplane_ctx_mac_get_br_ifindex(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.macinfo.br_ifindex;
}

/* Accessors for neighbor information */
const struct ipaddr *dplane_ctx_neigh_get_ipaddr(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.neigh.ip_addr);
}

const struct ipaddr *
dplane_ctx_neigh_get_link_ip(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.neigh.link.ip_addr);
}

const struct ethaddr *dplane_ctx_neigh_get_mac(
        const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return &(ctx->u.neigh.link.mac);
}

uint32_t dplane_ctx_neigh_get_flags(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.neigh.flags;
}

uint16_t dplane_ctx_neigh_get_state(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.neigh.state;
}

uint32_t dplane_ctx_neigh_get_update_flags(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);
        return ctx->u.neigh.update_flags;
}

/* Accessor for GRE set */
uint32_t
dplane_ctx_gre_get_link_ifindex(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.gre.link_ifindex;
}

unsigned int
dplane_ctx_gre_get_mtu(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.gre.mtu;
}

const struct zebra_l2info_gre *
dplane_ctx_gre_get_info(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &ctx->u.gre.info;
}

/* Accessors for PBR rule information */
int dplane_ctx_rule_get_sock(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.sock;
}

const char *dplane_ctx_rule_get_ifname(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.ifname;
}

int dplane_ctx_rule_get_unique(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.unique;
}

int dplane_ctx_rule_get_seq(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.seq;
}

uint32_t dplane_ctx_rule_get_priority(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.priority;
}

uint32_t dplane_ctx_rule_get_old_priority(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.old.priority;
}

uint32_t dplane_ctx_rule_get_table(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.table;
}

uint32_t dplane_ctx_rule_get_old_table(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.old.table;
}

uint32_t dplane_ctx_rule_get_filter_bm(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.filter_bm;
}

uint32_t dplane_ctx_rule_get_old_filter_bm(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.old.filter_bm;
}

uint32_t dplane_ctx_rule_get_fwmark(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.fwmark;
}

uint32_t dplane_ctx_rule_get_old_fwmark(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.old.fwmark;
}

uint8_t dplane_ctx_rule_get_ipproto(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.ip_proto;
}

uint8_t dplane_ctx_rule_get_old_ipproto(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.old.ip_proto;
}

uint8_t dplane_ctx_rule_get_dsfield(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.new.dsfield;
}

uint8_t dplane_ctx_rule_get_old_dsfield(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.rule.old.dsfield;
}

const struct prefix *
dplane_ctx_rule_get_src_ip(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rule.new.src_ip);
}

const struct prefix *
dplane_ctx_rule_get_old_src_ip(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rule.old.src_ip);
}

const struct prefix *
dplane_ctx_rule_get_dst_ip(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rule.new.dst_ip);
}

const struct prefix *
dplane_ctx_rule_get_old_dst_ip(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return &(ctx->u.rule.old.dst_ip);
}

uint32_t dplane_ctx_get_br_port_flags(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.br_port.flags;
}

uint32_t
dplane_ctx_get_br_port_sph_filter_cnt(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.br_port.sph_filter_cnt;
}

const struct in_addr *
dplane_ctx_get_br_port_sph_filters(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.br_port.sph_filters;
}

uint32_t
dplane_ctx_get_br_port_backup_nhg_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.br_port.backup_nhg_id;
}

/* Accessors for PBR iptable information */
void dplane_ctx_get_pbr_iptable(const struct zebra_dplane_ctx *ctx,
                                struct zebra_pbr_iptable *table)
{
        DPLANE_CTX_VALID(ctx);

        memcpy(table, &ctx->u.iptable, sizeof(struct zebra_pbr_iptable));
}

void dplane_ctx_get_pbr_ipset(const struct zebra_dplane_ctx *ctx,
                              struct zebra_pbr_ipset *ipset)
{
        DPLANE_CTX_VALID(ctx);

        assert(ipset);

        if (ctx->zd_op == DPLANE_OP_IPSET_ENTRY_ADD ||
            ctx->zd_op == DPLANE_OP_IPSET_ENTRY_DELETE) {
                memset(ipset, 0, sizeof(struct zebra_pbr_ipset));
                ipset->type = ctx->u.ipset_entry.info.type;
                ipset->family = ctx->u.ipset_entry.info.family;
                memcpy(&ipset->ipset_name, &ctx->u.ipset_entry.info.ipset_name,
                       ZEBRA_IPSET_NAME_SIZE);
        } else
                memcpy(ipset, &ctx->u.ipset, sizeof(struct zebra_pbr_ipset));
}

void dplane_ctx_get_pbr_ipset_entry(const struct zebra_dplane_ctx *ctx,
                                    struct zebra_pbr_ipset_entry *entry)
{
        DPLANE_CTX_VALID(ctx);

        assert(entry);

        memcpy(entry, &ctx->u.ipset_entry.entry, sizeof(struct zebra_pbr_ipset_entry));
}

/*
 * End of dplane context accessors
 */

/* Optional extra info about interfaces in nexthops - a plugin must enable
 * this extra info.
 */
const struct dplane_intf_extra *
dplane_ctx_get_intf_extra(const struct zebra_dplane_ctx *ctx)
{
        return TAILQ_FIRST(&ctx->u.rinfo.intf_extra_q);
}

const struct dplane_intf_extra *
dplane_ctx_intf_extra_next(const struct zebra_dplane_ctx *ctx,
                           const struct dplane_intf_extra *ptr)
{
        return TAILQ_NEXT(ptr, link);
}

vrf_id_t dplane_intf_extra_get_vrfid(const struct dplane_intf_extra *ptr)
{
        return ptr->vrf_id;
}

uint32_t dplane_intf_extra_get_ifindex(const struct dplane_intf_extra *ptr)
{
        return ptr->ifindex;
}

uint32_t dplane_intf_extra_get_flags(const struct dplane_intf_extra *ptr)
{
        return ptr->flags;
}

uint32_t dplane_intf_extra_get_status(const struct dplane_intf_extra *ptr)
{
        return ptr->status;
}

/*
 * End of interface extra info accessors
 */

uint8_t dplane_ctx_neightable_get_family(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.neightable.family;
}

uint32_t
dplane_ctx_neightable_get_app_probes(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.neightable.app_probes;
}

uint32_t
dplane_ctx_neightable_get_ucast_probes(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.neightable.ucast_probes;
}

uint32_t
dplane_ctx_neightable_get_mcast_probes(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.neightable.mcast_probes;
}

ifindex_t dplane_ctx_get_netconf_ifindex(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.netconf.ifindex;
}

ns_id_t dplane_ctx_get_netconf_ns_id(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.netconf.ns_id;
}

void dplane_ctx_set_netconf_ifindex(struct zebra_dplane_ctx *ctx,
                                    ifindex_t ifindex)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.netconf.ifindex = ifindex;
}

void dplane_ctx_set_netconf_ns_id(struct zebra_dplane_ctx *ctx, ns_id_t ns_id)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.netconf.ns_id = ns_id;
}

enum dplane_netconf_status_e
dplane_ctx_get_netconf_mpls(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.netconf.mpls_val;
}

enum dplane_netconf_status_e
dplane_ctx_get_netconf_mcast(const struct zebra_dplane_ctx *ctx)
{
        DPLANE_CTX_VALID(ctx);

        return ctx->u.netconf.mcast_val;
}

void dplane_ctx_set_netconf_mpls(struct zebra_dplane_ctx *ctx,
                                 enum dplane_netconf_status_e val)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.netconf.mpls_val = val;
}

void dplane_ctx_set_netconf_mcast(struct zebra_dplane_ctx *ctx,
                                  enum dplane_netconf_status_e val)
{
        DPLANE_CTX_VALID(ctx);

        ctx->u.netconf.mcast_val = val;
}

/*
 * Retrieve the limit on the number of pending, unprocessed updates.
 */
uint32_t dplane_get_in_queue_limit(void)
{
        return atomic_load_explicit(&zdplane_info.dg_max_queued_updates,
                                    memory_order_relaxed);
}

/*
 * Configure limit on the number of pending, queued updates.
 */
void dplane_set_in_queue_limit(uint32_t limit, bool set)
{
        /* Reset to default on 'unset' */
        if (!set)
                limit = DPLANE_DEFAULT_MAX_QUEUED;

        atomic_store_explicit(&zdplane_info.dg_max_queued_updates, limit,
                              memory_order_relaxed);
}

/*
 * Retrieve the current queue depth of incoming, unprocessed updates
 */
uint32_t dplane_get_in_queue_len(void)
{
        return atomic_load_explicit(&zdplane_info.dg_routes_queued,
                                    memory_order_seq_cst);
}

/*
 * Internal helper that copies information from a zebra ns object; this is
 * called in the zebra main pthread context as part of dplane ctx init.
 */
static void ctx_info_from_zns(struct zebra_dplane_info *ns_info,
                              struct zebra_ns *zns)
{
        ns_info->ns_id = zns->ns_id;

#if defined(HAVE_NETLINK)
        ns_info->is_cmd = true;
        ns_info->sock = zns->netlink_dplane_out.sock;
        ns_info->seq = zns->netlink_dplane_out.seq;
#endif /* NETLINK */
}

/*
 * Common dataplane context init with zebra namespace info.
 */
static int dplane_ctx_ns_init(struct zebra_dplane_ctx *ctx,
                              struct zebra_ns *zns,
                              bool is_update)
{
        ctx_info_from_zns(&(ctx->zd_ns_info), zns); /*  */

        ctx->zd_is_update = is_update;

#if defined(HAVE_NETLINK)
        /* Increment message counter after copying to context struct - may need
         * two messages in some 'update' cases.
         */
        if (is_update)
                zns->netlink_dplane_out.seq += 2;
        else
                zns->netlink_dplane_out.seq++;
#endif  /* HAVE_NETLINK */

        return AOK;
}

/*
 * Initialize a context block for a route update from zebra data structs.
 */
int dplane_ctx_route_init(struct zebra_dplane_ctx *ctx, enum dplane_op_e op,
                          struct route_node *rn, struct route_entry *re)
{
        int ret = EINVAL;
        const struct route_table *table = NULL;
        const struct rib_table_info *info;
        const struct prefix *p, *src_p;
        struct zebra_ns *zns;
        struct zebra_vrf *zvrf;
        struct nexthop *nexthop;
        struct zebra_l3vni *zl3vni;
        const struct interface *ifp;
        struct dplane_intf_extra *if_extra;

        if (!ctx || !rn || !re)
                goto done;

        TAILQ_INIT(&ctx->u.rinfo.intf_extra_q);

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        ctx->u.rinfo.zd_type = re->type;
        ctx->u.rinfo.zd_old_type = re->type;

        /* Prefixes: dest, and optional source */
        srcdest_rnode_prefixes(rn, &p, &src_p);

        prefix_copy(&(ctx->u.rinfo.zd_dest), p);

        if (src_p)
                prefix_copy(&(ctx->u.rinfo.zd_src), src_p);
        else
                memset(&(ctx->u.rinfo.zd_src), 0, sizeof(ctx->u.rinfo.zd_src));

        ctx->zd_table_id = re->table;

        ctx->u.rinfo.zd_metric = re->metric;
        ctx->u.rinfo.zd_old_metric = re->metric;
        ctx->zd_vrf_id = re->vrf_id;
        ctx->u.rinfo.zd_mtu = re->mtu;
        ctx->u.rinfo.zd_nexthop_mtu = re->nexthop_mtu;
        ctx->u.rinfo.zd_instance = re->instance;
        ctx->u.rinfo.zd_tag = re->tag;
        ctx->u.rinfo.zd_old_tag = re->tag;
        ctx->u.rinfo.zd_distance = re->distance;

        table = srcdest_rnode_table(rn);
        info = table->info;

        ctx->u.rinfo.zd_afi = info->afi;
        ctx->u.rinfo.zd_safi = info->safi;

        /* Copy nexthops; recursive info is included too */
        copy_nexthops(&(ctx->u.rinfo.zd_ng.nexthop),
                      re->nhe->nhg.nexthop, NULL);
        ctx->u.rinfo.zd_nhg_id = re->nhe->id;

        /* Copy backup nexthop info, if present */
        if (re->nhe->backup_info && re->nhe->backup_info->nhe) {
                copy_nexthops(&(ctx->u.rinfo.backup_ng.nexthop),
                              re->nhe->backup_info->nhe->nhg.nexthop, NULL);
        }

        /*
         * Ensure that the dplane nexthops' flags are clear and copy
         * encapsulation information.
         */
        for (ALL_NEXTHOPS(ctx->u.rinfo.zd_ng, nexthop)) {
                UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);

                /* Optionally capture extra interface info while we're in the
                 * main zebra pthread - a plugin has to ask for this info.
                 */
                if (dplane_collect_extra_intf_info) {
                        ifp = if_lookup_by_index(nexthop->ifindex,
                                                 nexthop->vrf_id);

                        if (ifp) {
                                if_extra = XCALLOC(
                                        MTYPE_DP_INTF,
                                        sizeof(struct dplane_intf_extra));
                                if_extra->vrf_id = nexthop->vrf_id;
                                if_extra->ifindex = nexthop->ifindex;
                                if_extra->flags = ifp->flags;
                                if_extra->status = ifp->status;

                                TAILQ_INSERT_TAIL(&ctx->u.rinfo.intf_extra_q,
                                                  if_extra, link);
                        }
                }

                /* Check for available evpn encapsulations. */
                if (!CHECK_FLAG(re->flags, ZEBRA_FLAG_EVPN_ROUTE))
                        continue;

                zl3vni = zl3vni_from_vrf(nexthop->vrf_id);
                if (zl3vni && is_l3vni_oper_up(zl3vni)) {
                        nexthop->nh_encap_type = NET_VXLAN;
                        nexthop->nh_encap.vni = zl3vni->vni;
                }
        }

        /* Don't need some info when capturing a system notification */
        if (op == DPLANE_OP_SYS_ROUTE_ADD ||
            op == DPLANE_OP_SYS_ROUTE_DELETE) {
                ret = AOK;
                goto done;
        }

        /* Extract ns info - can't use pointers to 'core' structs */
        zvrf = vrf_info_lookup(re->vrf_id);
        zns = zvrf->zns;
        dplane_ctx_ns_init(ctx, zns, (op == DPLANE_OP_ROUTE_UPDATE));

#ifdef HAVE_NETLINK
        {
                struct nhg_hash_entry *nhe = zebra_nhg_resolve(re->nhe);

                ctx->u.rinfo.nhe.id = nhe->id;
                ctx->u.rinfo.nhe.old_id = 0;
                /*
                 * Check if the nhe is installed/queued before doing anything
                 * with this route.
                 *
                 * If its a delete we only use the prefix anyway, so this only
                 * matters for INSTALL/UPDATE.
                 */
                if (zebra_nhg_kernel_nexthops_enabled()
                    && (((op == DPLANE_OP_ROUTE_INSTALL)
                         || (op == DPLANE_OP_ROUTE_UPDATE))
                        && !CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_INSTALLED)
                        && !CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_QUEUED))) {
                        ret = ENOENT;
                        goto done;
                }

                re->nhe_installed_id = nhe->id;
        }
#endif /* HAVE_NETLINK */

        /* Trying out the sequence number idea, so we can try to detect
         * when a result is stale.
         */
        re->dplane_sequence = zebra_router_get_next_sequence();
        ctx->zd_seq = re->dplane_sequence;

        ret = AOK;

done:
        return ret;
}

/**
 * dplane_ctx_nexthop_init() - Initialize a context block for a nexthop update
 *
 * @ctx:        Dataplane context to init
 * @op:         Operation being performed
 * @nhe:        Nexthop group hash entry
 *
 * Return:      Result status
 */
int dplane_ctx_nexthop_init(struct zebra_dplane_ctx *ctx, enum dplane_op_e op,
                            struct nhg_hash_entry *nhe)
{
        struct zebra_vrf *zvrf = NULL;
        struct zebra_ns *zns = NULL;
        int ret = EINVAL;

        if (!ctx || !nhe)
                goto done;

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        /* Copy over nhe info */
        ctx->u.rinfo.nhe.id = nhe->id;
        ctx->u.rinfo.nhe.afi = nhe->afi;
        ctx->u.rinfo.nhe.vrf_id = nhe->vrf_id;
        ctx->u.rinfo.nhe.type = nhe->type;

        nexthop_group_copy(&(ctx->u.rinfo.nhe.ng), &(nhe->nhg));

        /* If this is a group, convert it to a grp array of ids */
        if (!zebra_nhg_depends_is_empty(nhe)
            && !CHECK_FLAG(nhe->flags, NEXTHOP_GROUP_RECURSIVE))
                ctx->u.rinfo.nhe.nh_grp_count = zebra_nhg_nhe2grp(
                        ctx->u.rinfo.nhe.nh_grp, nhe, MULTIPATH_NUM);

        zvrf = vrf_info_lookup(nhe->vrf_id);

        /*
         * Fallback to default namespace if the vrf got ripped out from under
         * us.
         */
        zns = zvrf ? zvrf->zns : zebra_ns_lookup(NS_DEFAULT);

        /*
         * TODO: Might not need to mark this as an update, since
         * it probably won't require two messages
         */
        dplane_ctx_ns_init(ctx, zns, (op == DPLANE_OP_NH_UPDATE));

        ret = AOK;

done:
        return ret;
}

/**
 * dplane_ctx_intf_init() - Initialize a context block for a interface update
 *
 * @ctx:        Dataplane context to init
 * @op:         Operation being performed
 * @ifp:        Interface
 *
 * Return:      Result status
 */
int dplane_ctx_intf_init(struct zebra_dplane_ctx *ctx, enum dplane_op_e op,
                         const struct interface *ifp)
{
        struct zebra_ns *zns;
        struct zebra_if *zif;
        int ret = EINVAL;
        bool set_pdown, unset_pdown;

        if (!ctx || !ifp)
                goto done;

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        ctx->zd_vrf_id = ifp->vrf->vrf_id;

        strlcpy(ctx->zd_ifname, ifp->name, sizeof(ctx->zd_ifname));
        ctx->zd_ifindex = ifp->ifindex;

        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        dplane_ctx_ns_init(ctx, zns, false);


        /* Copy over ifp info */
        ctx->u.intf.metric = ifp->metric;
        ctx->u.intf.flags = ifp->flags;

        /* Copy over extra zebra info, if available */
        zif = (struct zebra_if *)ifp->info;

        if (zif) {
                set_pdown = !!(zif->flags & ZIF_FLAG_SET_PROTODOWN);
                unset_pdown = !!(zif->flags & ZIF_FLAG_UNSET_PROTODOWN);

                if (zif->protodown_rc &&
                    ZEBRA_IF_IS_PROTODOWN_ONLY_EXTERNAL(zif) == false)
                        ctx->u.intf.pd_reason_val = true;

                /*
                 * See if we have new protodown state to set, otherwise keep
                 * current state
                 */
                if (set_pdown)
                        ctx->u.intf.protodown = true;
                else if (unset_pdown)
                        ctx->u.intf.protodown = false;
                else
                        ctx->u.intf.protodown = !!ZEBRA_IF_IS_PROTODOWN(zif);
        }

        dplane_ctx_ns_init(ctx, zns, (op == DPLANE_OP_INTF_UPDATE));
        ctx->zd_is_update = (op == DPLANE_OP_INTF_UPDATE);

        ret = AOK;

done:
        return ret;
}

/*
 * Capture information for an LSP update in a dplane context.
 */
int dplane_ctx_lsp_init(struct zebra_dplane_ctx *ctx, enum dplane_op_e op,
                        struct zebra_lsp *lsp)
{
        int ret = AOK;
        struct zebra_nhlfe *nhlfe, *new_nhlfe;

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        /* Capture namespace info */
        dplane_ctx_ns_init(ctx, zebra_ns_lookup(NS_DEFAULT),
                           (op == DPLANE_OP_LSP_UPDATE));

        memset(&ctx->u.lsp, 0, sizeof(ctx->u.lsp));

        nhlfe_list_init(&(ctx->u.lsp.nhlfe_list));
        nhlfe_list_init(&(ctx->u.lsp.backup_nhlfe_list));

        /* This may be called to create/init a dplane context, not necessarily
         * to copy an lsp object.
         */
        if (lsp == NULL) {
                ret = AOK;
                goto done;
        }

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("init dplane ctx %s: in-label %u ecmp# %d",
                           dplane_op2str(op), lsp->ile.in_label,
                           lsp->num_ecmp);

        ctx->u.lsp.ile = lsp->ile;
        ctx->u.lsp.addr_family = lsp->addr_family;
        ctx->u.lsp.num_ecmp = lsp->num_ecmp;
        ctx->u.lsp.flags = lsp->flags;

        /* Copy source LSP's nhlfes, and capture 'best' nhlfe */
        frr_each(nhlfe_list, &lsp->nhlfe_list, nhlfe) {
                /* Not sure if this is meaningful... */
                if (nhlfe->nexthop == NULL)
                        continue;

                new_nhlfe = zebra_mpls_lsp_add_nh(&(ctx->u.lsp), nhlfe->type,
                                                  nhlfe->nexthop);
                if (new_nhlfe == NULL || new_nhlfe->nexthop == NULL) {
                        ret = ENOMEM;
                        break;
                }

                /* Need to copy flags and backup info too */
                new_nhlfe->flags = nhlfe->flags;
                new_nhlfe->nexthop->flags = nhlfe->nexthop->flags;

                if (CHECK_FLAG(new_nhlfe->nexthop->flags,
                               NEXTHOP_FLAG_HAS_BACKUP)) {
                        new_nhlfe->nexthop->backup_num =
                                nhlfe->nexthop->backup_num;
                        memcpy(new_nhlfe->nexthop->backup_idx,
                               nhlfe->nexthop->backup_idx,
                               new_nhlfe->nexthop->backup_num);
                }

                if (nhlfe == lsp->best_nhlfe)
                        ctx->u.lsp.best_nhlfe = new_nhlfe;
        }

        if (ret != AOK)
                goto done;

        /* Capture backup nhlfes/nexthops */
        frr_each(nhlfe_list, &lsp->backup_nhlfe_list, nhlfe) {
                /* Not sure if this is meaningful... */
                if (nhlfe->nexthop == NULL)
                        continue;

                new_nhlfe = zebra_mpls_lsp_add_backup_nh(&(ctx->u.lsp),
                                                         nhlfe->type,
                                                         nhlfe->nexthop);
                if (new_nhlfe == NULL || new_nhlfe->nexthop == NULL) {
                        ret = ENOMEM;
                        break;
                }

                /* Need to copy flags too */
                new_nhlfe->flags = nhlfe->flags;
                new_nhlfe->nexthop->flags = nhlfe->nexthop->flags;
        }

        /* On error the ctx will be cleaned-up, so we don't need to
         * deal with any allocated nhlfe or nexthop structs here.
         */
done:

        return ret;
}

/*
 * Capture information for an LSP update in a dplane context.
 */
static int dplane_ctx_pw_init(struct zebra_dplane_ctx *ctx,
                              enum dplane_op_e op,
                              struct zebra_pw *pw)
{
        int ret = EINVAL;
        struct prefix p;
        afi_t afi;
        struct route_table *table;
        struct route_node *rn;
        struct route_entry *re;
        const struct nexthop_group *nhg;
        struct nexthop *nh, *newnh, *last_nh;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("init dplane ctx %s: pw '%s', loc %u, rem %u",
                           dplane_op2str(op), pw->ifname, pw->local_label,
                           pw->remote_label);

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        /* Capture namespace info: no netlink support as of 12/18,
         * but just in case...
         */
        dplane_ctx_ns_init(ctx, zebra_ns_lookup(NS_DEFAULT), false);

        memset(&ctx->u.pw, 0, sizeof(ctx->u.pw));

        /* This name appears to be c-string, so we use string copy. */
        strlcpy(ctx->zd_ifname, pw->ifname, sizeof(ctx->zd_ifname));

        ctx->zd_vrf_id = pw->vrf_id;
        ctx->zd_ifindex = pw->ifindex;
        ctx->u.pw.type = pw->type;
        ctx->u.pw.af = pw->af;
        ctx->u.pw.local_label = pw->local_label;
        ctx->u.pw.remote_label = pw->remote_label;
        ctx->u.pw.flags = pw->flags;

        ctx->u.pw.dest = pw->nexthop;

        ctx->u.pw.fields = pw->data;

        /* Capture nexthop info for the pw destination. We need to look
         * up and use zebra datastructs, but we're running in the zebra
         * pthread here so that should be ok.
         */
        memcpy(&p.u, &pw->nexthop, sizeof(pw->nexthop));
        p.family = pw->af;
        p.prefixlen = ((pw->af == AF_INET) ? IPV4_MAX_BITLEN : IPV6_MAX_BITLEN);

        afi = (pw->af == AF_INET) ? AFI_IP : AFI_IP6;
        table = zebra_vrf_table(afi, SAFI_UNICAST, pw->vrf_id);
        if (table == NULL)
                goto done;

        rn = route_node_match(table, &p);
        if (rn == NULL)
                goto done;

        re = NULL;
        RNODE_FOREACH_RE(rn, re) {
                if (CHECK_FLAG(re->flags, ZEBRA_FLAG_SELECTED))
                        break;
        }

        if (re) {
                /* We'll capture a 'fib' list of nexthops that meet our
                 * criteria: installed, and labelled.
                 */
                nhg = rib_get_fib_nhg(re);
                last_nh = NULL;

                if (nhg && nhg->nexthop) {
                        for (ALL_NEXTHOPS_PTR(nhg, nh)) {
                                if (!CHECK_FLAG(nh->flags, NEXTHOP_FLAG_ACTIVE)
                                    || CHECK_FLAG(nh->flags,
                                                  NEXTHOP_FLAG_RECURSIVE)
                                    || nh->nh_label == NULL)
                                        continue;

                                newnh = nexthop_dup(nh, NULL);

                                if (last_nh)
                                        NEXTHOP_APPEND(last_nh, newnh);
                                else
                                        ctx->u.pw.fib_nhg.nexthop = newnh;
                                last_nh = newnh;
                        }
                }

                /* Include any installed backup nexthops also. */
                nhg = rib_get_fib_backup_nhg(re);
                if (nhg && nhg->nexthop) {
                        for (ALL_NEXTHOPS_PTR(nhg, nh)) {
                                if (!CHECK_FLAG(nh->flags, NEXTHOP_FLAG_ACTIVE)
                                    || CHECK_FLAG(nh->flags,
                                                  NEXTHOP_FLAG_RECURSIVE)
                                    || nh->nh_label == NULL)
                                        continue;

                                newnh = nexthop_dup(nh, NULL);

                                if (last_nh)
                                        NEXTHOP_APPEND(last_nh, newnh);
                                else
                                        ctx->u.pw.fib_nhg.nexthop = newnh;
                                last_nh = newnh;
                        }
                }

                /* Copy primary nexthops; recursive info is included too */
                assert(re->nhe != NULL); /* SA warning */
                copy_nexthops(&(ctx->u.pw.primary_nhg.nexthop),
                              re->nhe->nhg.nexthop, NULL);
                ctx->u.pw.nhg_id = re->nhe->id;

                /* Copy backup nexthop info, if present */
                if (re->nhe->backup_info && re->nhe->backup_info->nhe) {
                        copy_nexthops(&(ctx->u.pw.backup_nhg.nexthop),
                                      re->nhe->backup_info->nhe->nhg.nexthop,
                                      NULL);
                }
        }
        route_unlock_node(rn);

        ret = AOK;

done:
        return ret;
}

/**
 * dplane_ctx_rule_init_single() - Initialize a dataplane representation of a
 * PBR rule.
 *
 * @dplane_rule:        Dataplane internal representation of a rule
 * @rule:                       PBR rule
 */
static void dplane_ctx_rule_init_single(struct dplane_ctx_rule *dplane_rule,
                                        struct zebra_pbr_rule *rule)
{
        dplane_rule->priority = rule->rule.priority;
        dplane_rule->table = rule->rule.action.table;

        dplane_rule->filter_bm = rule->rule.filter.filter_bm;
        dplane_rule->fwmark = rule->rule.filter.fwmark;
        dplane_rule->dsfield = rule->rule.filter.dsfield;
        dplane_rule->ip_proto = rule->rule.filter.ip_proto;
        prefix_copy(&(dplane_rule->dst_ip), &rule->rule.filter.dst_ip);
        prefix_copy(&(dplane_rule->src_ip), &rule->rule.filter.src_ip);

        dplane_rule->action_pcp = rule->rule.action.pcp;
        dplane_rule->action_vlan_flags = rule->rule.action.vlan_flags;
        dplane_rule->action_vlan_id = rule->rule.action.vlan_id;
        dplane_rule->action_queue_id = rule->rule.action.queue_id;

        strlcpy(dplane_rule->ifname, rule->ifname, INTERFACE_NAMSIZ);
}

/**
 * dplane_ctx_rule_init() - Initialize a context block for a PBR rule update.
 *
 * @ctx:                Dataplane context to init
 * @op:                 Operation being performed
 * @new_rule:   PBR rule
 *
 * Return:      Result status
 */
static int dplane_ctx_rule_init(struct zebra_dplane_ctx *ctx,
                                enum dplane_op_e op,
                                struct zebra_pbr_rule *new_rule,
                                struct zebra_pbr_rule *old_rule)
{
        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug(
                        "init dplane ctx %s: IF %s Prio %u Fwmark %u Src %pFX Dst %pFX Table %u",
                        dplane_op2str(op), new_rule->ifname,
                        new_rule->rule.priority, new_rule->rule.filter.fwmark,
                        &new_rule->rule.filter.src_ip,
                        &new_rule->rule.filter.dst_ip,
                        new_rule->rule.action.table);

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        dplane_ctx_ns_init(ctx, zebra_ns_lookup(NS_DEFAULT),
                           op == DPLANE_OP_RULE_UPDATE);

        ctx->zd_vrf_id = new_rule->vrf_id;
        strlcpy(ctx->zd_ifname, new_rule->ifname, sizeof(ctx->zd_ifname));

        ctx->u.rule.sock = new_rule->sock;
        ctx->u.rule.unique = new_rule->rule.unique;
        ctx->u.rule.seq = new_rule->rule.seq;

        dplane_ctx_rule_init_single(&ctx->u.rule.new, new_rule);
        if (op == DPLANE_OP_RULE_UPDATE)
                dplane_ctx_rule_init_single(&ctx->u.rule.old, old_rule);

        return AOK;
}

/**
 * dplane_ctx_iptable_init() - Initialize a context block for a PBR iptable
 * update.
 *
 * @ctx:                Dataplane context to init
 * @op:                 Operation being performed
 * @new_rule:   PBR iptable
 *
 * Return:      Result status
 */
static int dplane_ctx_iptable_init(struct zebra_dplane_ctx *ctx,
                                   enum dplane_op_e op,
                                   struct zebra_pbr_iptable *iptable)
{
        char *ifname;
        struct listnode *node;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
                zlog_debug(
                        "init dplane ctx %s: Unique %u Fwmark %u Family %s Action %s",
                        dplane_op2str(op), iptable->unique, iptable->fwmark,
                        family2str(iptable->family),
                        iptable->action == ZEBRA_IPTABLES_DROP ? "Drop"
                                                               : "Forward");
        }

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        dplane_ctx_ns_init(ctx, zebra_ns_lookup(NS_DEFAULT), false);

        ctx->zd_vrf_id = iptable->vrf_id;
        memcpy(&ctx->u.iptable, iptable, sizeof(struct zebra_pbr_iptable));
        ctx->u.iptable.interface_name_list = NULL;
        if (iptable->nb_interface > 0) {
                ctx->u.iptable.interface_name_list = list_new();
                for (ALL_LIST_ELEMENTS_RO(iptable->interface_name_list, node,
                                          ifname)) {
                        listnode_add(ctx->u.iptable.interface_name_list,
                                     XSTRDUP(MTYPE_DP_NETFILTER, ifname));
                }
        }
        return AOK;
}

/**
 * dplane_ctx_ipset_init() - Initialize a context block for a PBR ipset update.
 *
 * @ctx:                Dataplane context to init
 * @op:                 Operation being performed
 * @new_rule:           PBR ipset
 *
 * Return:      Result status
 */
static int dplane_ctx_ipset_init(struct zebra_dplane_ctx *ctx,
                                 enum dplane_op_e op,
                                 struct zebra_pbr_ipset *ipset)
{
        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
                zlog_debug("init dplane ctx %s: %s Unique %u Family %s Type %s",
                           dplane_op2str(op), ipset->ipset_name, ipset->unique,
                           family2str(ipset->family),
                           zebra_pbr_ipset_type2str(ipset->type));
        }

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        dplane_ctx_ns_init(ctx, zebra_ns_lookup(NS_DEFAULT), false);

        ctx->zd_vrf_id = ipset->vrf_id;

        memcpy(&ctx->u.ipset, ipset, sizeof(struct zebra_pbr_ipset));
        return AOK;
}

/**
 * dplane_ctx_ipset_entry_init() - Initialize a context block for a PBR ipset
 * update.
 *
 * @ctx:                Dataplane context to init
 * @op:                 Operation being performed
 * @new_rule:   PBR ipset
 *
 * Return:      Result status
 */
static int
dplane_ctx_ipset_entry_init(struct zebra_dplane_ctx *ctx, enum dplane_op_e op,
                            struct zebra_pbr_ipset_entry *ipset_entry)
{
        struct zebra_pbr_ipset *ipset;

        ipset = ipset_entry->backpointer;
        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
                zlog_debug("init dplane ctx %s: %s Unique %u filter %u",
                           dplane_op2str(op), ipset->ipset_name,
                           ipset_entry->unique, ipset_entry->filter_bm);
        }

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        dplane_ctx_ns_init(ctx, zebra_ns_lookup(NS_DEFAULT), false);

        ctx->zd_vrf_id = ipset->vrf_id;

        memcpy(&ctx->u.ipset_entry.entry, ipset_entry,
               sizeof(struct zebra_pbr_ipset_entry));
        ctx->u.ipset_entry.entry.backpointer = NULL;
        ctx->u.ipset_entry.info.type = ipset->type;
        ctx->u.ipset_entry.info.family = ipset->family;
        memcpy(&ctx->u.ipset_entry.info.ipset_name, &ipset->ipset_name,
               ZEBRA_IPSET_NAME_SIZE);

        return AOK;
}


/*
 * Enqueue a new update,
 * and ensure an event is active for the dataplane pthread.
 */
static int dplane_update_enqueue(struct zebra_dplane_ctx *ctx)
{
        int ret = EINVAL;
        uint32_t high, curr;

        /* Enqueue for processing by the dataplane pthread */
        DPLANE_LOCK();
        {
                TAILQ_INSERT_TAIL(&zdplane_info.dg_update_ctx_q, ctx,
                                  zd_q_entries);
        }
        DPLANE_UNLOCK();

        curr = atomic_fetch_add_explicit(
                &(zdplane_info.dg_routes_queued),
                1, memory_order_seq_cst);

        curr++; /* We got the pre-incremented value */

        /* Maybe update high-water counter also */
        high = atomic_load_explicit(&zdplane_info.dg_routes_queued_max,
                                    memory_order_seq_cst);
        while (high < curr) {
                if (atomic_compare_exchange_weak_explicit(
                            &zdplane_info.dg_routes_queued_max,
                            &high, curr,
                            memory_order_seq_cst,
                            memory_order_seq_cst))
                        break;
        }

        /* Ensure that an event for the dataplane thread is active */
        ret = dplane_provider_work_ready();

        return ret;
}

/*
 * Utility that prepares a route update and enqueues it for processing
 */
static enum zebra_dplane_result
dplane_route_update_internal(struct route_node *rn,
                             struct route_entry *re,
                             struct route_entry *old_re,
                             enum dplane_op_e op)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *ctx = NULL;

        /* Obtain context block */
        ctx = dplane_ctx_alloc();

        /* Init context with info from zebra data structs */
        ret = dplane_ctx_route_init(ctx, op, rn, re);
        if (ret == AOK) {
                /* Capture some extra info for update case
                 * where there's a different 'old' route.
                 */
                if ((op == DPLANE_OP_ROUTE_UPDATE) &&
                    old_re && (old_re != re)) {

                        old_re->dplane_sequence =
                                zebra_router_get_next_sequence();
                        ctx->zd_old_seq = old_re->dplane_sequence;

                        ctx->u.rinfo.zd_old_tag = old_re->tag;
                        ctx->u.rinfo.zd_old_type = old_re->type;
                        ctx->u.rinfo.zd_old_instance = old_re->instance;
                        ctx->u.rinfo.zd_old_distance = old_re->distance;
                        ctx->u.rinfo.zd_old_metric = old_re->metric;
                        ctx->u.rinfo.nhe.old_id = old_re->nhe->id;

#ifndef HAVE_NETLINK
                        /* For bsd, capture previous re's nexthops too, sigh.
                         * We'll need these to do per-nexthop deletes.
                         */
                        copy_nexthops(&(ctx->u.rinfo.zd_old_ng.nexthop),
                                      old_re->nhe->nhg.nexthop, NULL);

                        if (zebra_nhg_get_backup_nhg(old_re->nhe) != NULL) {
                                struct nexthop_group *nhg;
                                struct nexthop **nh;

                                nhg = zebra_nhg_get_backup_nhg(old_re->nhe);
                                nh = &(ctx->u.rinfo.old_backup_ng.nexthop);

                                if (nhg->nexthop)
                                        copy_nexthops(nh, nhg->nexthop, NULL);
                        }
#endif  /* !HAVE_NETLINK */
                }

                /*
                 * If the old and new context type, and nexthop group id
                 * are the same there is no need to send down a route replace
                 * as that we know we have sent a nexthop group replace
                 * or an upper level protocol has sent us the exact
                 * same route again.
                 */
                if ((dplane_ctx_get_type(ctx) == dplane_ctx_get_old_type(ctx))
                    && (dplane_ctx_get_nhe_id(ctx)
                        == dplane_ctx_get_old_nhe_id(ctx))
                    && (dplane_ctx_get_nhe_id(ctx) >= ZEBRA_NHG_PROTO_LOWER)) {
                        struct nexthop *nexthop;

                        if (IS_ZEBRA_DEBUG_DPLANE)
                                zlog_debug(
                                        "%s: Ignoring Route exactly the same",
                                        __func__);

                        for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx),
                                              nexthop)) {
                                if (CHECK_FLAG(nexthop->flags,
                                               NEXTHOP_FLAG_RECURSIVE))
                                        continue;

                                if (CHECK_FLAG(nexthop->flags,
                                               NEXTHOP_FLAG_ACTIVE))
                                        SET_FLAG(nexthop->flags,
                                                 NEXTHOP_FLAG_FIB);
                        }

                        dplane_ctx_free(&ctx);
                        return ZEBRA_DPLANE_REQUEST_SUCCESS;
                }

                /* Enqueue context for processing */
                ret = dplane_update_enqueue(ctx);
        }

        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_routes_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_route_errors, 1,
                                          memory_order_relaxed);
                if (ctx)
                        dplane_ctx_free(&ctx);
        }

        return result;
}

/**
 * dplane_nexthop_update_internal() - Helper for enqueuing nexthop changes
 *
 * @nhe:        Nexthop group hash entry where the change occured
 * @op:         The operation to be enqued
 *
 * Return:      Result of the change
 */
static enum zebra_dplane_result
dplane_nexthop_update_internal(struct nhg_hash_entry *nhe, enum dplane_op_e op)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *ctx = NULL;

        /* Obtain context block */
        ctx = dplane_ctx_alloc();
        if (!ctx) {
                ret = ENOMEM;
                goto done;
        }

        ret = dplane_ctx_nexthop_init(ctx, op, nhe);
        if (ret == AOK)
                ret = dplane_update_enqueue(ctx);

done:
        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_nexthops_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_nexthop_errors, 1,
                                          memory_order_relaxed);
                if (ctx)
                        dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Enqueue a route 'add' for the dataplane.
 */
enum zebra_dplane_result dplane_route_add(struct route_node *rn,
                                          struct route_entry *re)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (rn == NULL || re == NULL)
                goto done;

        ret = dplane_route_update_internal(rn, re, NULL,
                                           DPLANE_OP_ROUTE_INSTALL);

done:
        return ret;
}

/*
 * Enqueue a route update for the dataplane.
 */
enum zebra_dplane_result dplane_route_update(struct route_node *rn,
                                             struct route_entry *re,
                                             struct route_entry *old_re)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (rn == NULL || re == NULL)
                goto done;

        ret = dplane_route_update_internal(rn, re, old_re,
                                           DPLANE_OP_ROUTE_UPDATE);
done:
        return ret;
}

/*
 * Enqueue a route removal for the dataplane.
 */
enum zebra_dplane_result dplane_route_delete(struct route_node *rn,
                                             struct route_entry *re)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (rn == NULL || re == NULL)
                goto done;

        ret = dplane_route_update_internal(rn, re, NULL,
                                           DPLANE_OP_ROUTE_DELETE);

done:
        return ret;
}

/*
 * Notify the dplane when system/connected routes change.
 */
enum zebra_dplane_result dplane_sys_route_add(struct route_node *rn,
                                              struct route_entry *re)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        /* Ignore this event unless a provider plugin has requested it. */
        if (!zdplane_info.dg_sys_route_notifs) {
                ret = ZEBRA_DPLANE_REQUEST_SUCCESS;
                goto done;
        }

        if (rn == NULL || re == NULL)
                goto done;

        ret = dplane_route_update_internal(rn, re, NULL,
                                           DPLANE_OP_SYS_ROUTE_ADD);

done:
        return ret;
}

/*
 * Notify the dplane when system/connected routes are deleted.
 */
enum zebra_dplane_result dplane_sys_route_del(struct route_node *rn,
                                              struct route_entry *re)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        /* Ignore this event unless a provider plugin has requested it. */
        if (!zdplane_info.dg_sys_route_notifs) {
                ret = ZEBRA_DPLANE_REQUEST_SUCCESS;
                goto done;
        }

        if (rn == NULL || re == NULL)
                goto done;

        ret = dplane_route_update_internal(rn, re, NULL,
                                           DPLANE_OP_SYS_ROUTE_DELETE);

done:
        return ret;
}

/*
 * Update from an async notification, to bring other fibs up-to-date.
 */
enum zebra_dplane_result
dplane_route_notif_update(struct route_node *rn,
                          struct route_entry *re,
                          enum dplane_op_e op,
                          struct zebra_dplane_ctx *ctx)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *new_ctx = NULL;
        struct nexthop *nexthop;
        struct nexthop_group *nhg;

        if (rn == NULL || re == NULL)
                goto done;

        new_ctx = dplane_ctx_alloc();
        if (new_ctx == NULL)
                goto done;

        /* Init context with info from zebra data structs */
        dplane_ctx_route_init(new_ctx, op, rn, re);

        /* For add/update, need to adjust the nexthops so that we match
         * the notification state, which may not be the route-entry/RIB
         * state.
         */
        if (op == DPLANE_OP_ROUTE_UPDATE ||
            op == DPLANE_OP_ROUTE_INSTALL) {

                nexthops_free(new_ctx->u.rinfo.zd_ng.nexthop);
                new_ctx->u.rinfo.zd_ng.nexthop = NULL;

                nhg = rib_get_fib_nhg(re);
                if (nhg && nhg->nexthop)
                        copy_nexthops(&(new_ctx->u.rinfo.zd_ng.nexthop),
                                      nhg->nexthop, NULL);

                /* Check for installed backup nexthops also */
                nhg = rib_get_fib_backup_nhg(re);
                if (nhg && nhg->nexthop) {
                        copy_nexthops(&(new_ctx->u.rinfo.zd_ng.nexthop),
                                      nhg->nexthop, NULL);
                }

                for (ALL_NEXTHOPS(new_ctx->u.rinfo.zd_ng, nexthop))
                        UNSET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);

        }

        /* Capture info about the source of the notification, in 'ctx' */
        dplane_ctx_set_notif_provider(new_ctx,
                                      dplane_ctx_get_notif_provider(ctx));

        ret = dplane_update_enqueue(new_ctx);

done:
        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else if (new_ctx)
                dplane_ctx_free(&new_ctx);

        return result;
}

/*
 * Enqueue a nexthop add for the dataplane.
 */
enum zebra_dplane_result dplane_nexthop_add(struct nhg_hash_entry *nhe)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (nhe)
                ret = dplane_nexthop_update_internal(nhe, DPLANE_OP_NH_INSTALL);
        return ret;
}

/*
 * Enqueue a nexthop update for the dataplane.
 *
 * Might not need this func since zebra's nexthop objects should be immutable?
 */
enum zebra_dplane_result dplane_nexthop_update(struct nhg_hash_entry *nhe)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (nhe)
                ret = dplane_nexthop_update_internal(nhe, DPLANE_OP_NH_UPDATE);
        return ret;
}

/*
 * Enqueue a nexthop removal for the dataplane.
 */
enum zebra_dplane_result dplane_nexthop_delete(struct nhg_hash_entry *nhe)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (nhe)
                ret = dplane_nexthop_update_internal(nhe, DPLANE_OP_NH_DELETE);

        return ret;
}

/*
 * Enqueue LSP add for the dataplane.
 */
enum zebra_dplane_result dplane_lsp_add(struct zebra_lsp *lsp)
{
        enum zebra_dplane_result ret =
                lsp_update_internal(lsp, DPLANE_OP_LSP_INSTALL);

        return ret;
}

/*
 * Enqueue LSP update for the dataplane.
 */
enum zebra_dplane_result dplane_lsp_update(struct zebra_lsp *lsp)
{
        enum zebra_dplane_result ret =
                lsp_update_internal(lsp, DPLANE_OP_LSP_UPDATE);

        return ret;
}

/*
 * Enqueue LSP delete for the dataplane.
 */
enum zebra_dplane_result dplane_lsp_delete(struct zebra_lsp *lsp)
{
        enum zebra_dplane_result ret =
                lsp_update_internal(lsp, DPLANE_OP_LSP_DELETE);

        return ret;
}

/* Update or un-install resulting from an async notification */
enum zebra_dplane_result
dplane_lsp_notif_update(struct zebra_lsp *lsp, enum dplane_op_e op,
                        struct zebra_dplane_ctx *notif_ctx)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *ctx = NULL;
        struct nhlfe_list_head *head;
        struct zebra_nhlfe *nhlfe, *new_nhlfe;

        /* Obtain context block */
        ctx = dplane_ctx_alloc();
        if (ctx == NULL) {
                ret = ENOMEM;
                goto done;
        }

        /* Copy info from zebra LSP */
        ret = dplane_ctx_lsp_init(ctx, op, lsp);
        if (ret != AOK)
                goto done;

        /* Add any installed backup nhlfes */
        head = &(ctx->u.lsp.backup_nhlfe_list);
        frr_each(nhlfe_list, head, nhlfe) {

                if (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED) &&
                    CHECK_FLAG(nhlfe->nexthop->flags, NEXTHOP_FLAG_FIB)) {
                        new_nhlfe = zebra_mpls_lsp_add_nh(&(ctx->u.lsp),
                                                          nhlfe->type,
                                                          nhlfe->nexthop);

                        /* Need to copy flags too */
                        new_nhlfe->flags = nhlfe->flags;
                        new_nhlfe->nexthop->flags = nhlfe->nexthop->flags;
                }
        }

        /* Capture info about the source of the notification */
        dplane_ctx_set_notif_provider(
                ctx,
                dplane_ctx_get_notif_provider(notif_ctx));

        ret = dplane_update_enqueue(ctx);

done:
        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_lsps_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_lsp_errors, 1,
                                          memory_order_relaxed);
                if (ctx)
                        dplane_ctx_free(&ctx);
        }
        return result;
}

/*
 * Enqueue pseudowire install for the dataplane.
 */
enum zebra_dplane_result dplane_pw_install(struct zebra_pw *pw)
{
        return pw_update_internal(pw, DPLANE_OP_PW_INSTALL);
}

/*
 * Enqueue pseudowire un-install for the dataplane.
 */
enum zebra_dplane_result dplane_pw_uninstall(struct zebra_pw *pw)
{
        return pw_update_internal(pw, DPLANE_OP_PW_UNINSTALL);
}

/*
 * Common internal LSP update utility
 */
static enum zebra_dplane_result lsp_update_internal(struct zebra_lsp *lsp,
                                                    enum dplane_op_e op)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *ctx = NULL;

        /* Obtain context block */
        ctx = dplane_ctx_alloc();

        ret = dplane_ctx_lsp_init(ctx, op, lsp);
        if (ret != AOK)
                goto done;

        ret = dplane_update_enqueue(ctx);

done:
        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_lsps_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_lsp_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Internal, common handler for pseudowire updates.
 */
static enum zebra_dplane_result pw_update_internal(struct zebra_pw *pw,
                                                   enum dplane_op_e op)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret;
        struct zebra_dplane_ctx *ctx = NULL;

        ctx = dplane_ctx_alloc();

        ret = dplane_ctx_pw_init(ctx, op, pw);
        if (ret != AOK)
                goto done;

        ret = dplane_update_enqueue(ctx);

done:
        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_pws_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_pw_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Enqueue access br_port update.
 */
enum zebra_dplane_result
dplane_br_port_update(const struct interface *ifp, bool non_df,
                      uint32_t sph_filter_cnt,
                      const struct in_addr *sph_filters, uint32_t backup_nhg_id)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        uint32_t flags = 0;
        int ret;
        struct zebra_dplane_ctx *ctx = NULL;
        struct zebra_ns *zns;
        enum dplane_op_e op = DPLANE_OP_BR_PORT_UPDATE;

        if (non_df)
                flags |= DPLANE_BR_PORT_NON_DF;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL || IS_ZEBRA_DEBUG_EVPN_MH_ES) {
                uint32_t i;
                char vtep_str[ES_VTEP_LIST_STR_SZ];

                vtep_str[0] = '\0';
                for (i = 0; i < sph_filter_cnt; ++i) {
                        snprintfrr(vtep_str + strlen(vtep_str),
                                   sizeof(vtep_str) - strlen(vtep_str), "%pI4 ",
                                   &sph_filters[i]);
                }
                zlog_debug(
                        "init br_port ctx %s: ifp %s, flags 0x%x backup_nhg 0x%x sph %s",
                        dplane_op2str(op), ifp->name, flags, backup_nhg_id,
                        vtep_str);
        }

        ctx = dplane_ctx_alloc();

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        ctx->zd_vrf_id = ifp->vrf->vrf_id;

        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        dplane_ctx_ns_init(ctx, zns, false);

        ctx->zd_ifindex = ifp->ifindex;
        strlcpy(ctx->zd_ifname, ifp->name, sizeof(ctx->zd_ifname));

        /* Init the br-port-specific data area */
        memset(&ctx->u.br_port, 0, sizeof(ctx->u.br_port));

        ctx->u.br_port.flags = flags;
        ctx->u.br_port.backup_nhg_id = backup_nhg_id;
        ctx->u.br_port.sph_filter_cnt = sph_filter_cnt;
        memcpy(ctx->u.br_port.sph_filters, sph_filters,
               sizeof(ctx->u.br_port.sph_filters[0]) * sph_filter_cnt);

        /* Enqueue for processing on the dplane pthread */
        ret = dplane_update_enqueue(ctx);

        /* Increment counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_br_port_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK) {
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        } else {
                /* Error counter */
                atomic_fetch_add_explicit(&zdplane_info.dg_br_port_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Enqueue interface address add for the dataplane.
 */
enum zebra_dplane_result dplane_intf_addr_set(const struct interface *ifp,
                                              const struct connected *ifc)
{
#if !defined(HAVE_NETLINK) && defined(HAVE_STRUCT_IFALIASREQ)
        /* Extra checks for this OS path. */

        /* Don't configure PtP addresses on broadcast ifs or reverse */
        if (!(ifp->flags & IFF_POINTOPOINT) != !CONNECTED_PEER(ifc)) {
                if (IS_ZEBRA_DEBUG_KERNEL || IS_ZEBRA_DEBUG_DPLANE)
                        zlog_debug("Failed to set intf addr: mismatch p2p and connected");

                return ZEBRA_DPLANE_REQUEST_FAILURE;
        }
#endif

        return intf_addr_update_internal(ifp, ifc, DPLANE_OP_ADDR_INSTALL);
}

/*
 * Enqueue interface address remove/uninstall for the dataplane.
 */
enum zebra_dplane_result dplane_intf_addr_unset(const struct interface *ifp,
                                                const struct connected *ifc)
{
        return intf_addr_update_internal(ifp, ifc, DPLANE_OP_ADDR_UNINSTALL);
}

static enum zebra_dplane_result intf_addr_update_internal(
        const struct interface *ifp, const struct connected *ifc,
        enum dplane_op_e op)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *ctx = NULL;
        struct zebra_ns *zns;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("init intf ctx %s: idx %d, addr %u:%pFX",
                           dplane_op2str(op), ifp->ifindex, ifp->vrf->vrf_id,
                           ifc->address);

        ctx = dplane_ctx_alloc();

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        ctx->zd_vrf_id = ifp->vrf->vrf_id;

        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        dplane_ctx_ns_init(ctx, zns, false);

        /* Init the interface-addr-specific area */
        memset(&ctx->u.intf, 0, sizeof(ctx->u.intf));

        strlcpy(ctx->zd_ifname, ifp->name, sizeof(ctx->zd_ifname));
        ctx->zd_ifindex = ifp->ifindex;
        ctx->u.intf.prefix = *(ifc->address);

        if (if_is_broadcast(ifp))
                ctx->u.intf.flags |= DPLANE_INTF_BROADCAST;

        if (CONNECTED_PEER(ifc)) {
                ctx->u.intf.dest_prefix = *(ifc->destination);
                ctx->u.intf.flags |=
                        (DPLANE_INTF_CONNECTED | DPLANE_INTF_HAS_DEST);
        }

        if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_SECONDARY))
                ctx->u.intf.flags |= DPLANE_INTF_SECONDARY;

        if (ifc->label) {
                size_t len;

                ctx->u.intf.flags |= DPLANE_INTF_HAS_LABEL;

                /* Use embedded buffer if it's adequate; else allocate. */
                len = strlen(ifc->label);

                if (len < sizeof(ctx->u.intf.label_buf)) {
                        strlcpy(ctx->u.intf.label_buf, ifc->label,
                                sizeof(ctx->u.intf.label_buf));
                        ctx->u.intf.label = ctx->u.intf.label_buf;
                } else {
                        ctx->u.intf.label = XSTRDUP(MTYPE_DP_CTX, ifc->label);
                }
        }

        ret = dplane_update_enqueue(ctx);

        /* Increment counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_intf_addrs_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                /* Error counter */
                atomic_fetch_add_explicit(&zdplane_info.dg_intf_addr_errors,
                                          1, memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/**
 * dplane_intf_update_internal() - Helper for enqueuing interface changes
 *
 * @ifp:        Interface where the change occured
 * @op:         The operation to be enqued
 *
 * Return:      Result of the change
 */
static enum zebra_dplane_result
dplane_intf_update_internal(const struct interface *ifp, enum dplane_op_e op)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret = EINVAL;
        struct zebra_dplane_ctx *ctx = NULL;

        /* Obtain context block */
        ctx = dplane_ctx_alloc();
        if (!ctx) {
                ret = ENOMEM;
                goto done;
        }

        ret = dplane_ctx_intf_init(ctx, op, ifp);
        if (ret == AOK)
                ret = dplane_update_enqueue(ctx);

done:
        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_intfs_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_intf_errors, 1,
                                          memory_order_relaxed);
                if (ctx)
                        dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Enqueue a interface add for the dataplane.
 */
enum zebra_dplane_result dplane_intf_add(const struct interface *ifp)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (ifp)
                ret = dplane_intf_update_internal(ifp, DPLANE_OP_INTF_INSTALL);
        return ret;
}

/*
 * Enqueue a interface update for the dataplane.
 */
enum zebra_dplane_result dplane_intf_update(const struct interface *ifp)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (ifp)
                ret = dplane_intf_update_internal(ifp, DPLANE_OP_INTF_UPDATE);
        return ret;
}

/*
 * Enqueue a interface delete for the dataplane.
 */
enum zebra_dplane_result dplane_intf_delete(const struct interface *ifp)
{
        enum zebra_dplane_result ret = ZEBRA_DPLANE_REQUEST_FAILURE;

        if (ifp)
                ret = dplane_intf_update_internal(ifp, DPLANE_OP_INTF_DELETE);
        return ret;
}

/*
 * Enqueue vxlan/evpn mac add (or update).
 */
enum zebra_dplane_result dplane_rem_mac_add(const struct interface *ifp,
                                        const struct interface *bridge_ifp,
                                        vlanid_t vid,
                                        const struct ethaddr *mac,
                                        struct in_addr vtep_ip,
                                        bool sticky,
                                        uint32_t nhg_id,
                                        bool was_static)
{
        enum zebra_dplane_result result;
        uint32_t update_flags = 0;

        update_flags |= DPLANE_MAC_REMOTE;
        if (was_static)
                update_flags |= DPLANE_MAC_WAS_STATIC;

        /* Use common helper api */
        result = mac_update_common(DPLANE_OP_MAC_INSTALL, ifp, bridge_ifp,
                                   vid, mac, vtep_ip, sticky, nhg_id, update_flags);
        return result;
}

/*
 * Enqueue vxlan/evpn mac delete.
 */
enum zebra_dplane_result dplane_rem_mac_del(const struct interface *ifp,
                                        const struct interface *bridge_ifp,
                                        vlanid_t vid,
                                        const struct ethaddr *mac,
                                        struct in_addr vtep_ip)
{
        enum zebra_dplane_result result;
        uint32_t update_flags = 0;

        update_flags |= DPLANE_MAC_REMOTE;

        /* Use common helper api */
        result = mac_update_common(DPLANE_OP_MAC_DELETE, ifp, bridge_ifp,
                                   vid, mac, vtep_ip, false, 0, update_flags);
        return result;
}

/*
 * API to configure link local with either MAC address or IP information
 */
enum zebra_dplane_result dplane_neigh_ip_update(enum dplane_op_e op,
                                                const struct interface *ifp,
                                                struct ipaddr *link_ip,
                                                struct ipaddr *ip,
                                                uint32_t ndm_state, int protocol)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        uint16_t state = 0;
        uint32_t update_flags;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("%s: init link ctx %s: ifp %s, link_ip %pIA ip %pIA",
                           __func__, dplane_op2str(op), ifp->name, link_ip, ip);

        if (ndm_state == ZEBRA_NEIGH_STATE_REACHABLE)
                state = DPLANE_NUD_REACHABLE;
        else if (ndm_state == ZEBRA_NEIGH_STATE_FAILED)
                state = DPLANE_NUD_FAILED;

        update_flags = DPLANE_NEIGH_NO_EXTENSION;

        result = neigh_update_internal(op, ifp, (const void *)link_ip,
                                       ipaddr_family(link_ip), ip, 0, state,
                                       update_flags, protocol);

        return result;
}

/*
 * Enqueue local mac add (or update).
 */
enum zebra_dplane_result dplane_local_mac_add(const struct interface *ifp,
                                        const struct interface *bridge_ifp,
                                        vlanid_t vid,
                                        const struct ethaddr *mac,
                                        bool sticky,
                                        uint32_t set_static,
                                        uint32_t set_inactive)
{
        enum zebra_dplane_result result;
        uint32_t update_flags = 0;
        struct in_addr vtep_ip;

        if (set_static)
                update_flags |= DPLANE_MAC_SET_STATIC;

        if (set_inactive)
                update_flags |= DPLANE_MAC_SET_INACTIVE;

        vtep_ip.s_addr = 0;

        /* Use common helper api */
        result = mac_update_common(DPLANE_OP_MAC_INSTALL, ifp, bridge_ifp,
                                     vid, mac, vtep_ip, sticky, 0,
                                     update_flags);
        return result;
}

/*
 * Enqueue local mac del
 */
enum zebra_dplane_result
dplane_local_mac_del(const struct interface *ifp,
                     const struct interface *bridge_ifp, vlanid_t vid,
                     const struct ethaddr *mac)
{
        enum zebra_dplane_result result;
        struct in_addr vtep_ip;

        vtep_ip.s_addr = 0;

        /* Use common helper api */
        result = mac_update_common(DPLANE_OP_MAC_DELETE, ifp, bridge_ifp, vid,
                                   mac, vtep_ip, false, 0, 0);
        return result;
}
/*
 * Public api to init an empty context - either newly-allocated or
 * reset/cleared - for a MAC update.
 */
void dplane_mac_init(struct zebra_dplane_ctx *ctx,
                     const struct interface *ifp,
                     const struct interface *br_ifp,
                     vlanid_t vid,
                     const struct ethaddr *mac,
                     struct in_addr vtep_ip,
                     bool sticky,
                     uint32_t nhg_id,
                     uint32_t update_flags)
{
        struct zebra_ns *zns;

        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        ctx->zd_vrf_id = ifp->vrf->vrf_id;

        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        dplane_ctx_ns_init(ctx, zns, false);

        strlcpy(ctx->zd_ifname, ifp->name, sizeof(ctx->zd_ifname));
        ctx->zd_ifindex = ifp->ifindex;

        /* Init the mac-specific data area */
        memset(&ctx->u.macinfo, 0, sizeof(ctx->u.macinfo));

        ctx->u.macinfo.br_ifindex = br_ifp->ifindex;
        ctx->u.macinfo.vtep_ip = vtep_ip;
        ctx->u.macinfo.mac = *mac;
        ctx->u.macinfo.vid = vid;
        ctx->u.macinfo.is_sticky = sticky;
        ctx->u.macinfo.nhg_id = nhg_id;
        ctx->u.macinfo.update_flags = update_flags;
}

/*
 * Common helper api for MAC address/vxlan updates
 */
static enum zebra_dplane_result
mac_update_common(enum dplane_op_e op,
                  const struct interface *ifp,
                  const struct interface *br_ifp,
                  vlanid_t vid,
                  const struct ethaddr *mac,
                  struct in_addr vtep_ip,
                  bool sticky,
                  uint32_t nhg_id,
                  uint32_t update_flags)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret;
        struct zebra_dplane_ctx *ctx = NULL;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("init mac ctx %s: mac %pEA, ifp %s, vtep %pI4",
                           dplane_op2str(op), mac, ifp->name, &vtep_ip);

        ctx = dplane_ctx_alloc();
        ctx->zd_op = op;

        /* Common init for the ctx */
        dplane_mac_init(ctx, ifp, br_ifp, vid, mac, vtep_ip, sticky,
                        nhg_id, update_flags);

        /* Enqueue for processing on the dplane pthread */
        ret = dplane_update_enqueue(ctx);

        /* Increment counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_macs_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                /* Error counter */
                atomic_fetch_add_explicit(&zdplane_info.dg_mac_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Enqueue evpn neighbor add for the dataplane.
 */
enum zebra_dplane_result dplane_rem_neigh_add(const struct interface *ifp,
                                          const struct ipaddr *ip,
                                          const struct ethaddr *mac,
                                          uint32_t flags, bool was_static)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        uint32_t update_flags = 0;

        update_flags |= DPLANE_NEIGH_REMOTE;

        if (was_static)
                update_flags |= DPLANE_NEIGH_WAS_STATIC;

        result = neigh_update_internal(
                DPLANE_OP_NEIGH_INSTALL, ifp, (const void *)mac, AF_ETHERNET,
                ip, flags, DPLANE_NUD_NOARP, update_flags, 0);

        return result;
}

/*
 * Enqueue local neighbor add for the dataplane.
 */
enum zebra_dplane_result dplane_local_neigh_add(const struct interface *ifp,
                                          const struct ipaddr *ip,
                                          const struct ethaddr *mac,
                                          bool set_router, bool set_static,
                                          bool set_inactive)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        uint32_t update_flags = 0;
        uint32_t ntf = 0;
        uint16_t state;

        if (set_static)
                update_flags |= DPLANE_NEIGH_SET_STATIC;

        if (set_inactive) {
                update_flags |= DPLANE_NEIGH_SET_INACTIVE;
                state = DPLANE_NUD_STALE;
        } else {
                state = DPLANE_NUD_REACHABLE;
        }

        if (set_router)
                ntf |= DPLANE_NTF_ROUTER;

        result = neigh_update_internal(DPLANE_OP_NEIGH_INSTALL, ifp,
                                       (const void *)mac, AF_ETHERNET, ip, ntf,
                                       state, update_flags, 0);

        return result;
}

/*
 * Enqueue evpn neighbor delete for the dataplane.
 */
enum zebra_dplane_result dplane_rem_neigh_delete(const struct interface *ifp,
                                             const struct ipaddr *ip)
{
        enum zebra_dplane_result result;
        uint32_t update_flags = 0;

        update_flags |= DPLANE_NEIGH_REMOTE;

        result = neigh_update_internal(DPLANE_OP_NEIGH_DELETE, ifp, NULL,
                                       AF_ETHERNET, ip, 0, 0, update_flags, 0);

        return result;
}

/*
 * Enqueue evpn VTEP add for the dataplane.
 */
enum zebra_dplane_result dplane_vtep_add(const struct interface *ifp,
                                         const struct in_addr *ip,
                                         vni_t vni)
{
        enum zebra_dplane_result result;
        struct ethaddr mac = { {0, 0, 0, 0, 0, 0} };
        struct ipaddr addr;

        if (IS_ZEBRA_DEBUG_VXLAN)
                zlog_debug("Install %pI4 into flood list for VNI %u intf %s(%u)",
                           ip, vni, ifp->name, ifp->ifindex);

        SET_IPADDR_V4(&addr);
        addr.ipaddr_v4 = *ip;

        result = neigh_update_internal(DPLANE_OP_VTEP_ADD, ifp, &mac,
                                       AF_ETHERNET, &addr, 0, 0, 0, 0);

        return result;
}

/*
 * Enqueue evpn VTEP add for the dataplane.
 */
enum zebra_dplane_result dplane_vtep_delete(const struct interface *ifp,
                                            const struct in_addr *ip,
                                            vni_t vni)
{
        enum zebra_dplane_result result;
        struct ethaddr mac = { {0, 0, 0, 0, 0, 0} };
        struct ipaddr addr;

        if (IS_ZEBRA_DEBUG_VXLAN)
                zlog_debug(
                        "Uninstall %pI4 from flood list for VNI %u intf %s(%u)",
                        ip, vni, ifp->name, ifp->ifindex);

        SET_IPADDR_V4(&addr);
        addr.ipaddr_v4 = *ip;

        result = neigh_update_internal(DPLANE_OP_VTEP_DELETE, ifp,
                                       (const void *)&mac, AF_ETHERNET, &addr,
                                       0, 0, 0, 0);

        return result;
}

enum zebra_dplane_result dplane_neigh_discover(const struct interface *ifp,
                                               const struct ipaddr *ip)
{
        enum zebra_dplane_result result;

        result = neigh_update_internal(DPLANE_OP_NEIGH_DISCOVER, ifp, NULL,
                                       AF_ETHERNET, ip, DPLANE_NTF_USE,
                                       DPLANE_NUD_INCOMPLETE, 0, 0);

        return result;
}

enum zebra_dplane_result dplane_neigh_table_update(const struct interface *ifp,
                                                   const uint8_t family,
                                                   const uint32_t app_probes,
                                                   const uint32_t ucast_probes,
                                                   const uint32_t mcast_probes)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret;
        struct zebra_dplane_ctx *ctx = NULL;
        struct zebra_ns *zns;
        enum dplane_op_e op = DPLANE_OP_NEIGH_TABLE_UPDATE;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
                zlog_debug("set neigh ctx %s: ifp %s, family %s",
                           dplane_op2str(op), ifp->name, family2str(family));
        }

        ctx = dplane_ctx_alloc();

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        ctx->zd_vrf_id = ifp->vrf->vrf_id;

        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        dplane_ctx_ns_init(ctx, zns, false);

        strlcpy(ctx->zd_ifname, ifp->name, sizeof(ctx->zd_ifname));
        ctx->zd_ifindex = ifp->ifindex;

        /* Init the neighbor-specific data area */
        memset(&ctx->u.neightable, 0, sizeof(ctx->u.neightable));

        ctx->u.neightable.family = family;
        ctx->u.neightable.app_probes = app_probes;
        ctx->u.neightable.ucast_probes = ucast_probes;
        ctx->u.neightable.mcast_probes = mcast_probes;

        /* Enqueue for processing on the dplane pthread */
        ret = dplane_update_enqueue(ctx);

        /* Increment counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_neightable_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                /* Error counter */
                atomic_fetch_add_explicit(&zdplane_info.dg_neightable_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Common helper api for neighbor updates
 */
static enum zebra_dplane_result
neigh_update_internal(enum dplane_op_e op, const struct interface *ifp,
                      const void *link, const int link_family,
                      const struct ipaddr *ip, uint32_t flags, uint16_t state,
                      uint32_t update_flags, int protocol)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        int ret;
        struct zebra_dplane_ctx *ctx = NULL;
        struct zebra_ns *zns;
        const struct ethaddr *mac = NULL;
        const struct ipaddr *link_ip = NULL;

        if (link_family == AF_ETHERNET)
                mac = (const struct ethaddr *)link;
        else
                link_ip = (const struct ipaddr *)link;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
                char buf1[PREFIX_STRLEN];

                buf1[0] = '\0';
                if (link_family == AF_ETHERNET)
                        prefix_mac2str(mac, buf1, sizeof(buf1));
                else
                        ipaddr2str(link_ip, buf1, sizeof(buf1));
                zlog_debug("init neigh ctx %s: ifp %s, %s %s, ip %pIA",
                           dplane_op2str(op), ifp->name,
                           link_family == AF_ETHERNET ? "mac " : "link ",
                           buf1, ip);
        }

        ctx = dplane_ctx_alloc();

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        ctx->zd_vrf_id = ifp->vrf->vrf_id;
        dplane_ctx_set_type(ctx, protocol);

        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        dplane_ctx_ns_init(ctx, zns, false);

        strlcpy(ctx->zd_ifname, ifp->name, sizeof(ctx->zd_ifname));
        ctx->zd_ifindex = ifp->ifindex;

        /* Init the neighbor-specific data area */
        memset(&ctx->u.neigh, 0, sizeof(ctx->u.neigh));

        ctx->u.neigh.ip_addr = *ip;
        if (mac)
                ctx->u.neigh.link.mac = *mac;
        else if (link_ip)
                ctx->u.neigh.link.ip_addr = *link_ip;

        ctx->u.neigh.flags = flags;
        ctx->u.neigh.state = state;
        ctx->u.neigh.update_flags = update_flags;

        /* Enqueue for processing on the dplane pthread */
        ret = dplane_update_enqueue(ctx);

        /* Increment counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_neighs_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                /* Error counter */
                atomic_fetch_add_explicit(&zdplane_info.dg_neigh_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

/*
 * Common helper api for PBR rule updates
 */
static enum zebra_dplane_result
rule_update_internal(enum dplane_op_e op, struct zebra_pbr_rule *new_rule,
                     struct zebra_pbr_rule *old_rule)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        struct zebra_dplane_ctx *ctx;
        int ret;

        ctx = dplane_ctx_alloc();

        ret = dplane_ctx_rule_init(ctx, op, new_rule, old_rule);
        if (ret != AOK)
                goto done;

        ret = dplane_update_enqueue(ctx);

done:
        atomic_fetch_add_explicit(&zdplane_info.dg_rules_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_rule_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

enum zebra_dplane_result dplane_pbr_rule_add(struct zebra_pbr_rule *rule)
{
        return rule_update_internal(DPLANE_OP_RULE_ADD, rule, NULL);
}

enum zebra_dplane_result dplane_pbr_rule_delete(struct zebra_pbr_rule *rule)
{
        return rule_update_internal(DPLANE_OP_RULE_DELETE, rule, NULL);
}

enum zebra_dplane_result dplane_pbr_rule_update(struct zebra_pbr_rule *old_rule,
                                                struct zebra_pbr_rule *new_rule)
{
        return rule_update_internal(DPLANE_OP_RULE_UPDATE, new_rule, old_rule);
}
/*
 * Common helper api for iptable updates
 */
static enum zebra_dplane_result
iptable_update_internal(enum dplane_op_e op, struct zebra_pbr_iptable *iptable)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        struct zebra_dplane_ctx *ctx;
        int ret;

        if ((op == DPLANE_OP_IPTABLE_ADD &&
             CHECK_FLAG(iptable->internal_flags, IPTABLE_INSTALL_QUEUED)) ||
            (op == DPLANE_OP_IPTABLE_DELETE &&
             CHECK_FLAG(iptable->internal_flags, IPTABLE_UNINSTALL_QUEUED))) {
                if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                        zlog_debug(
                                "update dplane ctx %s: iptable %s already in progress",
                                dplane_op2str(op), iptable->ipset_name);
                return result;
        }

        ctx = dplane_ctx_alloc();

        ret = dplane_ctx_iptable_init(ctx, op, iptable);
        if (ret != AOK)
                goto done;

        ret = dplane_update_enqueue(ctx);

done:
        atomic_fetch_add_explicit(&zdplane_info.dg_iptable_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK) {
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
                if (op == DPLANE_OP_IPTABLE_ADD)
                        SET_FLAG(iptable->internal_flags,
                                 IPTABLE_INSTALL_QUEUED);
                else
                        SET_FLAG(iptable->internal_flags,
                                 IPTABLE_UNINSTALL_QUEUED);
        } else {
                atomic_fetch_add_explicit(&zdplane_info.dg_iptable_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }
        return result;
}

enum zebra_dplane_result
dplane_pbr_iptable_add(struct zebra_pbr_iptable *iptable)
{
        return iptable_update_internal(DPLANE_OP_IPTABLE_ADD, iptable);
}

enum zebra_dplane_result
dplane_pbr_iptable_delete(struct zebra_pbr_iptable *iptable)
{
        return iptable_update_internal(DPLANE_OP_IPTABLE_DELETE, iptable);
}

/*
 * Common helper api for ipset updates
 */
static enum zebra_dplane_result
ipset_update_internal(enum dplane_op_e op, struct zebra_pbr_ipset *ipset)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        struct zebra_dplane_ctx *ctx;
        int ret;

        ctx = dplane_ctx_alloc();

        ret = dplane_ctx_ipset_init(ctx, op, ipset);
        if (ret != AOK)
                goto done;

        ret = dplane_update_enqueue(ctx);

done:
        atomic_fetch_add_explicit(&zdplane_info.dg_ipset_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_ipset_errors, 1,
                                          memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

enum zebra_dplane_result dplane_pbr_ipset_add(struct zebra_pbr_ipset *ipset)
{
        return ipset_update_internal(DPLANE_OP_IPSET_ADD, ipset);
}

enum zebra_dplane_result dplane_pbr_ipset_delete(struct zebra_pbr_ipset *ipset)
{
        return ipset_update_internal(DPLANE_OP_IPSET_DELETE, ipset);
}

/*
 * Common helper api for ipset updates
 */
static enum zebra_dplane_result
ipset_entry_update_internal(enum dplane_op_e op,
                            struct zebra_pbr_ipset_entry *ipset_entry)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        struct zebra_dplane_ctx *ctx;
        int ret;

        ctx = dplane_ctx_alloc();

        ret = dplane_ctx_ipset_entry_init(ctx, op, ipset_entry);
        if (ret != AOK)
                goto done;

        ret = dplane_update_enqueue(ctx);

done:
        atomic_fetch_add_explicit(&zdplane_info.dg_ipset_entry_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(&zdplane_info.dg_ipset_entry_errors,
                                          1, memory_order_relaxed);
                dplane_ctx_free(&ctx);
        }

        return result;
}

enum zebra_dplane_result
dplane_pbr_ipset_entry_add(struct zebra_pbr_ipset_entry *ipset)
{
        return ipset_entry_update_internal(DPLANE_OP_IPSET_ENTRY_ADD, ipset);
}

enum zebra_dplane_result
dplane_pbr_ipset_entry_delete(struct zebra_pbr_ipset_entry *ipset)
{
        return ipset_entry_update_internal(DPLANE_OP_IPSET_ENTRY_DELETE, ipset);
}

/*
 * Common helper api for GRE set
 */
enum zebra_dplane_result
dplane_gre_set(struct interface *ifp, struct interface *ifp_link,
               unsigned int mtu, const struct zebra_l2info_gre *gre_info)
{
        enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
        struct zebra_dplane_ctx *ctx;
        enum dplane_op_e op = DPLANE_OP_GRE_SET;
        int ret;
        struct zebra_ns *zns;

        ctx = dplane_ctx_alloc();

        if (!ifp)
                return result;

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL) {
                zlog_debug("init dplane ctx %s: if %s link %s%s",
                           dplane_op2str(op), ifp->name,
                           ifp_link ? "set" : "unset", ifp_link ?
                           ifp_link->name : "");
        }

        ctx->zd_op = op;
        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;
        zns = zebra_ns_lookup(ifp->vrf->vrf_id);
        if (!zns)
                return result;
        dplane_ctx_ns_init(ctx, zns, false);

        dplane_ctx_set_ifname(ctx, ifp->name);
        ctx->zd_vrf_id = ifp->vrf->vrf_id;
        ctx->zd_ifindex = ifp->ifindex;
        if (ifp_link)
                ctx->u.gre.link_ifindex = ifp_link->ifindex;
        else
                ctx->u.gre.link_ifindex = 0;
        if (gre_info)
                memcpy(&ctx->u.gre.info, gre_info, sizeof(ctx->u.gre.info));
        ctx->u.gre.mtu = mtu;

        ctx->zd_status = ZEBRA_DPLANE_REQUEST_SUCCESS;

        /* Enqueue context for processing */
        ret = dplane_update_enqueue(ctx);

        /* Update counter */
        atomic_fetch_add_explicit(&zdplane_info.dg_gre_set_in, 1,
                                  memory_order_relaxed);

        if (ret == AOK)
                result = ZEBRA_DPLANE_REQUEST_QUEUED;
        else {
                atomic_fetch_add_explicit(
                        &zdplane_info.dg_gre_set_errors, 1,
                        memory_order_relaxed);
                if (ctx)
                        dplane_ctx_free(&ctx);
                result = ZEBRA_DPLANE_REQUEST_FAILURE;
        }
        return result;
}

/*
 * Handler for 'show dplane'
 */
int dplane_show_helper(struct vty *vty, bool detailed)
{
        uint64_t queued, queue_max, limit, errs, incoming, yields,
                other_errs;

        /* Using atomics because counters are being changed in different
         * pthread contexts.
         */
        incoming = atomic_load_explicit(&zdplane_info.dg_routes_in,
                                        memory_order_relaxed);
        limit = atomic_load_explicit(&zdplane_info.dg_max_queued_updates,
                                     memory_order_relaxed);
        queued = atomic_load_explicit(&zdplane_info.dg_routes_queued,
                                      memory_order_relaxed);
        queue_max = atomic_load_explicit(&zdplane_info.dg_routes_queued_max,
                                         memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_route_errors,
                                    memory_order_relaxed);
        yields = atomic_load_explicit(&zdplane_info.dg_update_yields,
                                      memory_order_relaxed);
        other_errs = atomic_load_explicit(&zdplane_info.dg_other_errors,
                                          memory_order_relaxed);

        vty_out(vty, "Zebra dataplane:\nRoute updates:            %"PRIu64"\n",
                incoming);
        vty_out(vty, "Route update errors:      %"PRIu64"\n", errs);
        vty_out(vty, "Other errors       :      %"PRIu64"\n", other_errs);
        vty_out(vty, "Route update queue limit: %"PRIu64"\n", limit);
        vty_out(vty, "Route update queue depth: %"PRIu64"\n", queued);
        vty_out(vty, "Route update queue max:   %"PRIu64"\n", queue_max);
        vty_out(vty, "Dplane update yields:     %"PRIu64"\n", yields);

        incoming = atomic_load_explicit(&zdplane_info.dg_lsps_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_lsp_errors,
                                    memory_order_relaxed);
        vty_out(vty, "LSP updates:              %"PRIu64"\n", incoming);
        vty_out(vty, "LSP update errors:        %"PRIu64"\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_pws_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_pw_errors,
                                    memory_order_relaxed);
        vty_out(vty, "PW updates:               %"PRIu64"\n", incoming);
        vty_out(vty, "PW update errors:         %"PRIu64"\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_intf_addrs_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_intf_addr_errors,
                                    memory_order_relaxed);
        vty_out(vty, "Intf addr updates:        %"PRIu64"\n", incoming);
        vty_out(vty, "Intf addr errors:         %"PRIu64"\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_macs_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_mac_errors,
                                    memory_order_relaxed);
        vty_out(vty, "EVPN MAC updates:         %"PRIu64"\n", incoming);
        vty_out(vty, "EVPN MAC errors:          %"PRIu64"\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_neighs_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_neigh_errors,
                                    memory_order_relaxed);
        vty_out(vty, "EVPN neigh updates:       %"PRIu64"\n", incoming);
        vty_out(vty, "EVPN neigh errors:        %"PRIu64"\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_rules_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_rule_errors,
                                    memory_order_relaxed);
        vty_out(vty, "Rule updates:             %" PRIu64 "\n", incoming);
        vty_out(vty, "Rule errors:              %" PRIu64 "\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_br_port_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_br_port_errors,
                                    memory_order_relaxed);
        vty_out(vty, "Bridge port updates:      %" PRIu64 "\n", incoming);
        vty_out(vty, "Bridge port errors:       %" PRIu64 "\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_iptable_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_iptable_errors,
                                    memory_order_relaxed);
        vty_out(vty, "IPtable updates:             %" PRIu64 "\n", incoming);
        vty_out(vty, "IPtable errors:              %" PRIu64 "\n", errs);
        incoming = atomic_load_explicit(&zdplane_info.dg_ipset_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_ipset_errors,
                                    memory_order_relaxed);
        vty_out(vty, "IPset updates:             %" PRIu64 "\n", incoming);
        vty_out(vty, "IPset errors:              %" PRIu64 "\n", errs);
        incoming = atomic_load_explicit(&zdplane_info.dg_ipset_entry_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_ipset_entry_errors,
                                    memory_order_relaxed);
        vty_out(vty, "IPset entry updates:             %" PRIu64 "\n", incoming);
        vty_out(vty, "IPset entry errors:              %" PRIu64 "\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_neightable_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_neightable_errors,
                                    memory_order_relaxed);
        vty_out(vty, "Neighbor Table updates:       %"PRIu64"\n", incoming);
        vty_out(vty, "Neighbor Table errors:        %"PRIu64"\n", errs);

        incoming = atomic_load_explicit(&zdplane_info.dg_gre_set_in,
                                        memory_order_relaxed);
        errs = atomic_load_explicit(&zdplane_info.dg_gre_set_errors,
                                    memory_order_relaxed);
        vty_out(vty, "GRE set updates:       %"PRIu64"\n", incoming);
        vty_out(vty, "GRE set errors:        %"PRIu64"\n", errs);
        return CMD_SUCCESS;
}

/*
 * Handler for 'show dplane providers'
 */
int dplane_show_provs_helper(struct vty *vty, bool detailed)
{
        struct zebra_dplane_provider *prov;
        uint64_t in, in_q, in_max, out, out_q, out_max;

        vty_out(vty, "Zebra dataplane providers:\n");

        DPLANE_LOCK();
        prov = TAILQ_FIRST(&zdplane_info.dg_providers_q);
        DPLANE_UNLOCK();

        /* Show counters, useful info from each registered provider */
        while (prov) {

                in = atomic_load_explicit(&prov->dp_in_counter,
                                          memory_order_relaxed);
                in_q = atomic_load_explicit(&prov->dp_in_queued,
                                            memory_order_relaxed);
                in_max = atomic_load_explicit(&prov->dp_in_max,
                                              memory_order_relaxed);
                out = atomic_load_explicit(&prov->dp_out_counter,
                                           memory_order_relaxed);
                out_q = atomic_load_explicit(&prov->dp_out_queued,
                                             memory_order_relaxed);
                out_max = atomic_load_explicit(&prov->dp_out_max,
                                               memory_order_relaxed);

                vty_out(vty, "%s (%u): in: %"PRIu64", q: %"PRIu64", q_max: %"PRIu64", out: %"PRIu64", q: %"PRIu64", q_max: %"PRIu64"\n",
                        prov->dp_name, prov->dp_id, in, in_q, in_max,
                        out, out_q, out_max);

                DPLANE_LOCK();
                prov = TAILQ_NEXT(prov, dp_prov_link);
                DPLANE_UNLOCK();
        }

        return CMD_SUCCESS;
}

/*
 * Helper for 'show run' etc.
 */
int dplane_config_write_helper(struct vty *vty)
{
        if (zdplane_info.dg_max_queued_updates != DPLANE_DEFAULT_MAX_QUEUED)
                vty_out(vty, "zebra dplane limit %u\n",
                        zdplane_info.dg_max_queued_updates);

        return 0;
}

/*
 * Provider registration
 */
int dplane_provider_register(const char *name,
                             enum dplane_provider_prio prio,
                             int flags,
                             int (*start_fp)(struct zebra_dplane_provider *),
                             int (*fp)(struct zebra_dplane_provider *),
                             int (*fini_fp)(struct zebra_dplane_provider *,
                                            bool early),
                             void *data,
                             struct zebra_dplane_provider **prov_p)
{
        int ret = 0;
        struct zebra_dplane_provider *p = NULL, *last;

        /* Validate */
        if (fp == NULL) {
                ret = EINVAL;
                goto done;
        }

        if (prio <= DPLANE_PRIO_NONE ||
            prio > DPLANE_PRIO_LAST) {
                ret = EINVAL;
                goto done;
        }

        /* Allocate and init new provider struct */
        p = XCALLOC(MTYPE_DP_PROV, sizeof(struct zebra_dplane_provider));

        pthread_mutex_init(&(p->dp_mutex), NULL);
        TAILQ_INIT(&(p->dp_ctx_in_q));
        TAILQ_INIT(&(p->dp_ctx_out_q));

        p->dp_flags = flags;
        p->dp_priority = prio;
        p->dp_fp = fp;
        p->dp_start = start_fp;
        p->dp_fini = fini_fp;
        p->dp_data = data;

        /* Lock - the dplane pthread may be running */
        DPLANE_LOCK();

        p->dp_id = ++zdplane_info.dg_provider_id;

        if (name)
                strlcpy(p->dp_name, name, DPLANE_PROVIDER_NAMELEN);
        else
                snprintf(p->dp_name, DPLANE_PROVIDER_NAMELEN,
                         "provider-%u", p->dp_id);

        /* Insert into list ordered by priority */
        TAILQ_FOREACH(last, &zdplane_info.dg_providers_q, dp_prov_link) {
                if (last->dp_priority > p->dp_priority)
                        break;
        }

        if (last)
                TAILQ_INSERT_BEFORE(last, p, dp_prov_link);
        else
                TAILQ_INSERT_TAIL(&zdplane_info.dg_providers_q, p,
                                  dp_prov_link);

        /* And unlock */
        DPLANE_UNLOCK();

        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("dplane: registered new provider '%s' (%u), prio %d",
                           p->dp_name, p->dp_id, p->dp_priority);

done:
        if (prov_p)
                *prov_p = p;

        return ret;
}

/* Accessors for provider attributes */
const char *dplane_provider_get_name(const struct zebra_dplane_provider *prov)
{
        return prov->dp_name;
}

uint32_t dplane_provider_get_id(const struct zebra_dplane_provider *prov)
{
        return prov->dp_id;
}

void *dplane_provider_get_data(const struct zebra_dplane_provider *prov)
{
        return prov->dp_data;
}

int dplane_provider_get_work_limit(const struct zebra_dplane_provider *prov)
{
        return zdplane_info.dg_updates_per_cycle;
}

/* Lock/unlock a provider's mutex - iff the provider was registered with
 * the THREADED flag.
 */
void dplane_provider_lock(struct zebra_dplane_provider *prov)
{
        if (dplane_provider_is_threaded(prov))
                DPLANE_PROV_LOCK(prov);
}

void dplane_provider_unlock(struct zebra_dplane_provider *prov)
{
        if (dplane_provider_is_threaded(prov))
                DPLANE_PROV_UNLOCK(prov);
}

/*
 * Dequeue and maintain associated counter
 */
struct zebra_dplane_ctx *dplane_provider_dequeue_in_ctx(
        struct zebra_dplane_provider *prov)
{
        struct zebra_dplane_ctx *ctx = NULL;

        dplane_provider_lock(prov);

        ctx = TAILQ_FIRST(&(prov->dp_ctx_in_q));
        if (ctx) {
                TAILQ_REMOVE(&(prov->dp_ctx_in_q), ctx, zd_q_entries);

                atomic_fetch_sub_explicit(&prov->dp_in_queued, 1,
                                          memory_order_relaxed);
        }

        dplane_provider_unlock(prov);

        return ctx;
}

/*
 * Dequeue work to a list, return count
 */
int dplane_provider_dequeue_in_list(struct zebra_dplane_provider *prov,
                                    struct dplane_ctx_q *listp)
{
        int limit, ret;
        struct zebra_dplane_ctx *ctx;

        limit = zdplane_info.dg_updates_per_cycle;

        dplane_provider_lock(prov);

        for (ret = 0; ret < limit; ret++) {
                ctx = TAILQ_FIRST(&(prov->dp_ctx_in_q));
                if (ctx) {
                        TAILQ_REMOVE(&(prov->dp_ctx_in_q), ctx, zd_q_entries);

                        TAILQ_INSERT_TAIL(listp, ctx, zd_q_entries);
                } else {
                        break;
                }
        }

        if (ret > 0)
                atomic_fetch_sub_explicit(&prov->dp_in_queued, ret,
                                          memory_order_relaxed);

        dplane_provider_unlock(prov);

        return ret;
}

uint32_t dplane_provider_out_ctx_queue_len(struct zebra_dplane_provider *prov)
{
        return atomic_load_explicit(&(prov->dp_out_counter),
                                    memory_order_relaxed);
}

/*
 * Enqueue and maintain associated counter
 */
void dplane_provider_enqueue_out_ctx(struct zebra_dplane_provider *prov,
                                     struct zebra_dplane_ctx *ctx)
{
        uint64_t curr, high;

        dplane_provider_lock(prov);

        TAILQ_INSERT_TAIL(&(prov->dp_ctx_out_q), ctx,
                          zd_q_entries);

        /* Maintain out-queue counters */
        atomic_fetch_add_explicit(&(prov->dp_out_queued), 1,
                                  memory_order_relaxed);
        curr = atomic_load_explicit(&prov->dp_out_queued,
                                    memory_order_relaxed);
        high = atomic_load_explicit(&prov->dp_out_max,
                                    memory_order_relaxed);
        if (curr > high)
                atomic_store_explicit(&prov->dp_out_max, curr,
                                      memory_order_relaxed);

        dplane_provider_unlock(prov);

        atomic_fetch_add_explicit(&(prov->dp_out_counter), 1,
                                  memory_order_relaxed);
}

/*
 * Accessor for provider object
 */
bool dplane_provider_is_threaded(const struct zebra_dplane_provider *prov)
{
        return (prov->dp_flags & DPLANE_PROV_FLAG_THREADED);
}

#ifdef HAVE_NETLINK
/*
 * Callback when an OS (netlink) incoming event read is ready. This runs
 * in the dplane pthread.
 */
static void dplane_incoming_read(struct thread *event)
{
        struct dplane_zns_info *zi = THREAD_ARG(event);

        kernel_dplane_read(&zi->info);

        /* Re-start read task */
        thread_add_read(zdplane_info.dg_master, dplane_incoming_read, zi,
                        zi->info.sock, &zi->t_read);
}

/*
 * Callback in the dataplane pthread that requests info from the OS and
 * initiates netlink reads.
 */
static void dplane_incoming_request(struct thread *event)
{
        struct dplane_zns_info *zi = THREAD_ARG(event);

        /* Start read task */
        thread_add_read(zdplane_info.dg_master, dplane_incoming_read, zi,
                        zi->info.sock, &zi->t_read);

        /* Send requests */
        netlink_request_netconf(zi->info.sock);
}

/*
 * Initiate requests for existing info from the OS. This is called by the
 * main pthread, but we want all activity on the dplane netlink socket to
 * take place on the dplane pthread, so we schedule an event to accomplish
 * that.
 */
static void dplane_kernel_info_request(struct dplane_zns_info *zi)
{
        /* If we happen to encounter an enabled zns before the dplane
         * pthread is running, we'll initiate this later on.
         */
        if (zdplane_info.dg_master)
                thread_add_event(zdplane_info.dg_master,
                                 dplane_incoming_request, zi, 0,
                                 &zi->t_request);
}

#endif /* HAVE_NETLINK */

/*
 * Notify dplane when namespaces are enabled and disabled. The dplane
 * needs to start and stop reading incoming events from the zns. In the
 * common case where vrfs are _not_ namespaces, there will only be one
 * of these.
 *
 * This is called in the main pthread.
 */
void zebra_dplane_ns_enable(struct zebra_ns *zns, bool enabled)
{
        struct dplane_zns_info *zi;

        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("%s: %s for nsid %u", __func__,
                           (enabled ? "ENABLED" : "DISABLED"), zns->ns_id);

        /* Search for an existing zns info entry */
        frr_each (zns_info_list, &zdplane_info.dg_zns_list, zi) {
                if (zi->info.ns_id == zns->ns_id)
                        break;
        }

        if (enabled) {
                /* Create a new entry if necessary; start reading. */
                if (zi == NULL) {
                        zi = XCALLOC(MTYPE_DP_NS, sizeof(*zi));

                        zi->info.ns_id = zns->ns_id;

                        zns_info_list_add_tail(&zdplane_info.dg_zns_list, zi);

                        if (IS_ZEBRA_DEBUG_DPLANE)
                                zlog_debug("%s: nsid %u, new zi %p", __func__,
                                           zns->ns_id, zi);
                }

                /* Make sure we're up-to-date with the zns object */
#if defined(HAVE_NETLINK)
                zi->info.is_cmd = false;
                zi->info.sock = zns->netlink_dplane_in.sock;

                /* Initiate requests for existing info from the OS, and
                 * begin reading from the netlink socket.
                 */
                dplane_kernel_info_request(zi);
#endif
        } else if (zi) {
                if (IS_ZEBRA_DEBUG_DPLANE)
                        zlog_debug("%s: nsid %u, deleting zi %p", __func__,
                                   zns->ns_id, zi);

                /* Stop reading, free memory */
                zns_info_list_del(&zdplane_info.dg_zns_list, zi);

                /* Stop any outstanding tasks */
                if (zdplane_info.dg_master) {
                        thread_cancel_async(zdplane_info.dg_master,
                                            &zi->t_request, NULL);

                        thread_cancel_async(zdplane_info.dg_master, &zi->t_read,
                                            NULL);
                }

                XFREE(MTYPE_DP_NS, zi);
        }
}

/*
 * Provider api to signal that work/events are available
 * for the dataplane pthread.
 */
int dplane_provider_work_ready(void)
{
        /* Note that during zebra startup, we may be offered work before
         * the dataplane pthread (and thread-master) are ready. We want to
         * enqueue the work, but the event-scheduling machinery may not be
         * available.
         */
        if (zdplane_info.dg_run) {
                thread_add_event(zdplane_info.dg_master,
                                 dplane_thread_loop, NULL, 0,
                                 &zdplane_info.dg_t_update);
        }

        return AOK;
}

/*
 * Enqueue a context directly to zebra main.
 */
void dplane_provider_enqueue_to_zebra(struct zebra_dplane_ctx *ctx)
{
        struct dplane_ctx_q temp_list;

        /* Zebra's api takes a list, so we need to use a temporary list */
        TAILQ_INIT(&temp_list);

        TAILQ_INSERT_TAIL(&temp_list, ctx, zd_q_entries);
        (zdplane_info.dg_results_cb)(&temp_list);
}

/*
 * Kernel dataplane provider
 */

static void kernel_dplane_log_detail(struct zebra_dplane_ctx *ctx)
{
        char buf[PREFIX_STRLEN];

        switch (dplane_ctx_get_op(ctx)) {

        case DPLANE_OP_ROUTE_INSTALL:
        case DPLANE_OP_ROUTE_UPDATE:
        case DPLANE_OP_ROUTE_DELETE:
                zlog_debug("%u:%pFX Dplane route update ctx %p op %s",
                           dplane_ctx_get_vrf(ctx), dplane_ctx_get_dest(ctx),
                           ctx, dplane_op2str(dplane_ctx_get_op(ctx)));
                break;

        case DPLANE_OP_NH_INSTALL:
        case DPLANE_OP_NH_UPDATE:
        case DPLANE_OP_NH_DELETE:
                zlog_debug("ID (%u) Dplane nexthop update ctx %p op %s",
                           dplane_ctx_get_nhe_id(ctx), ctx,
                           dplane_op2str(dplane_ctx_get_op(ctx)));
                break;

        case DPLANE_OP_LSP_INSTALL:
        case DPLANE_OP_LSP_UPDATE:
        case DPLANE_OP_LSP_DELETE:
                break;

        case DPLANE_OP_PW_INSTALL:
        case DPLANE_OP_PW_UNINSTALL:
                zlog_debug("Dplane pw %s: op %s af %d loc: %u rem: %u",
                           dplane_ctx_get_ifname(ctx),
                           dplane_op2str(ctx->zd_op), dplane_ctx_get_pw_af(ctx),
                           dplane_ctx_get_pw_local_label(ctx),
                           dplane_ctx_get_pw_remote_label(ctx));
                break;

        case DPLANE_OP_ADDR_INSTALL:
        case DPLANE_OP_ADDR_UNINSTALL:
                zlog_debug("Dplane intf %s, idx %u, addr %pFX",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_ifindex(ctx),
                           dplane_ctx_get_intf_addr(ctx));
                break;

        case DPLANE_OP_MAC_INSTALL:
        case DPLANE_OP_MAC_DELETE:
                prefix_mac2str(dplane_ctx_mac_get_addr(ctx), buf,
                               sizeof(buf));

                zlog_debug("Dplane %s, mac %s, ifindex %u",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           buf, dplane_ctx_get_ifindex(ctx));
                break;

        case DPLANE_OP_NEIGH_INSTALL:
        case DPLANE_OP_NEIGH_UPDATE:
        case DPLANE_OP_NEIGH_DELETE:
        case DPLANE_OP_VTEP_ADD:
        case DPLANE_OP_VTEP_DELETE:
        case DPLANE_OP_NEIGH_DISCOVER:
        case DPLANE_OP_NEIGH_IP_INSTALL:
        case DPLANE_OP_NEIGH_IP_DELETE:
                ipaddr2str(dplane_ctx_neigh_get_ipaddr(ctx), buf,
                           sizeof(buf));

                zlog_debug("Dplane %s, ip %s, ifindex %u",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           buf, dplane_ctx_get_ifindex(ctx));
                break;

        case DPLANE_OP_RULE_ADD:
        case DPLANE_OP_RULE_DELETE:
        case DPLANE_OP_RULE_UPDATE:
                zlog_debug("Dplane rule update op %s, if %s(%u), ctx %p",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_ifname(ctx),
                           dplane_ctx_get_ifindex(ctx), ctx);
                break;

        case DPLANE_OP_SYS_ROUTE_ADD:
        case DPLANE_OP_SYS_ROUTE_DELETE:
        case DPLANE_OP_ROUTE_NOTIFY:
        case DPLANE_OP_LSP_NOTIFY:
        case DPLANE_OP_BR_PORT_UPDATE:

        case DPLANE_OP_NONE:
                break;

        case DPLANE_OP_IPTABLE_ADD:
        case DPLANE_OP_IPTABLE_DELETE: {
                struct zebra_pbr_iptable ipt;

                dplane_ctx_get_pbr_iptable(ctx, &ipt);
                zlog_debug("Dplane iptable update op %s, unique(%u), ctx %p",
                           dplane_op2str(dplane_ctx_get_op(ctx)), ipt.unique,
                           ctx);
        } break;
        case DPLANE_OP_IPSET_ADD:
        case DPLANE_OP_IPSET_DELETE: {
                struct zebra_pbr_ipset ipset;

                dplane_ctx_get_pbr_ipset(ctx, &ipset);
                zlog_debug("Dplane ipset update op %s, unique(%u), ctx %p",
                           dplane_op2str(dplane_ctx_get_op(ctx)), ipset.unique,
                           ctx);
        } break;
        case DPLANE_OP_IPSET_ENTRY_ADD:
        case DPLANE_OP_IPSET_ENTRY_DELETE: {
                struct zebra_pbr_ipset_entry ipent;

                dplane_ctx_get_pbr_ipset_entry(ctx, &ipent);
                zlog_debug(
                        "Dplane ipset entry update op %s, unique(%u), ctx %p",
                        dplane_op2str(dplane_ctx_get_op(ctx)), ipent.unique,
                        ctx);
        } break;
        case DPLANE_OP_NEIGH_TABLE_UPDATE:
                zlog_debug("Dplane neigh table op %s, ifp %s, family %s",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_ifname(ctx),
                           family2str(dplane_ctx_neightable_get_family(ctx)));
                break;
        case DPLANE_OP_GRE_SET:
                zlog_debug("Dplane gre set op %s, ifp %s, link %u",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_ifname(ctx),
                           ctx->u.gre.link_ifindex);
                break;

        case DPLANE_OP_INTF_ADDR_ADD:
        case DPLANE_OP_INTF_ADDR_DEL:
                zlog_debug("Dplane incoming op %s, intf %s, addr %pFX",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_ifname(ctx),
                           dplane_ctx_get_intf_addr(ctx));
                break;

        case DPLANE_OP_INTF_NETCONFIG:
                zlog_debug("%s: ifindex %d, mpls %d, mcast %d",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_netconf_ifindex(ctx),
                           dplane_ctx_get_netconf_mpls(ctx),
                           dplane_ctx_get_netconf_mcast(ctx));
                break;

        case DPLANE_OP_INTF_INSTALL:
        case DPLANE_OP_INTF_UPDATE:
        case DPLANE_OP_INTF_DELETE:
                zlog_debug("Dplane intf %s, idx %u, protodown %d",
                           dplane_op2str(dplane_ctx_get_op(ctx)),
                           dplane_ctx_get_ifindex(ctx),
                           dplane_ctx_intf_is_protodown(ctx));
                break;
        }
}

static void kernel_dplane_handle_result(struct zebra_dplane_ctx *ctx)
{
        enum zebra_dplane_result res = dplane_ctx_get_status(ctx);

        switch (dplane_ctx_get_op(ctx)) {

        case DPLANE_OP_ROUTE_INSTALL:
        case DPLANE_OP_ROUTE_UPDATE:
        case DPLANE_OP_ROUTE_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_route_errors,
                                                  1, memory_order_relaxed);

                if ((dplane_ctx_get_op(ctx) != DPLANE_OP_ROUTE_DELETE)
                    && (res == ZEBRA_DPLANE_REQUEST_SUCCESS)) {
                        struct nexthop *nexthop;

                        /* Update installed nexthops to signal which have been
                         * installed.
                         */
                        for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx),
                                              nexthop)) {
                                if (CHECK_FLAG(nexthop->flags,
                                               NEXTHOP_FLAG_RECURSIVE))
                                        continue;

                                if (CHECK_FLAG(nexthop->flags,
                                               NEXTHOP_FLAG_ACTIVE)) {
                                        SET_FLAG(nexthop->flags,
                                                 NEXTHOP_FLAG_FIB);
                                }
                        }
                }
                break;

        case DPLANE_OP_NH_INSTALL:
        case DPLANE_OP_NH_UPDATE:
        case DPLANE_OP_NH_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(
                                &zdplane_info.dg_nexthop_errors, 1,
                                memory_order_relaxed);
                break;

        case DPLANE_OP_LSP_INSTALL:
        case DPLANE_OP_LSP_UPDATE:
        case DPLANE_OP_LSP_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_lsp_errors,
                                                  1, memory_order_relaxed);
                break;

        case DPLANE_OP_PW_INSTALL:
        case DPLANE_OP_PW_UNINSTALL:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_pw_errors, 1,
                                                  memory_order_relaxed);
                break;

        case DPLANE_OP_ADDR_INSTALL:
        case DPLANE_OP_ADDR_UNINSTALL:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(
                                &zdplane_info.dg_intf_addr_errors, 1,
                                memory_order_relaxed);
                break;

        case DPLANE_OP_MAC_INSTALL:
        case DPLANE_OP_MAC_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_mac_errors,
                                                  1, memory_order_relaxed);
                break;

        case DPLANE_OP_NEIGH_INSTALL:
        case DPLANE_OP_NEIGH_UPDATE:
        case DPLANE_OP_NEIGH_DELETE:
        case DPLANE_OP_VTEP_ADD:
        case DPLANE_OP_VTEP_DELETE:
        case DPLANE_OP_NEIGH_DISCOVER:
        case DPLANE_OP_NEIGH_IP_INSTALL:
        case DPLANE_OP_NEIGH_IP_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_neigh_errors,
                                                  1, memory_order_relaxed);
                break;

        case DPLANE_OP_RULE_ADD:
        case DPLANE_OP_RULE_DELETE:
        case DPLANE_OP_RULE_UPDATE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_rule_errors,
                                                  1, memory_order_relaxed);
                break;

        case DPLANE_OP_IPTABLE_ADD:
        case DPLANE_OP_IPTABLE_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(
                                &zdplane_info.dg_iptable_errors, 1,
                                memory_order_relaxed);
                break;

        case DPLANE_OP_IPSET_ADD:
        case DPLANE_OP_IPSET_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_ipset_errors,
                                                  1, memory_order_relaxed);
                break;

        case DPLANE_OP_IPSET_ENTRY_ADD:
        case DPLANE_OP_IPSET_ENTRY_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(
                                &zdplane_info.dg_ipset_entry_errors, 1,
                                memory_order_relaxed);
                break;

        case DPLANE_OP_NEIGH_TABLE_UPDATE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(
                                &zdplane_info.dg_neightable_errors, 1,
                                memory_order_relaxed);
                break;

        case DPLANE_OP_GRE_SET:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(
                                &zdplane_info.dg_gre_set_errors, 1,
                                memory_order_relaxed);
                break;

        case DPLANE_OP_INTF_INSTALL:
        case DPLANE_OP_INTF_UPDATE:
        case DPLANE_OP_INTF_DELETE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_intf_errors,
                                                  1, memory_order_relaxed);
                break;

        /* Ignore 'notifications' - no-op */
        case DPLANE_OP_SYS_ROUTE_ADD:
        case DPLANE_OP_SYS_ROUTE_DELETE:
        case DPLANE_OP_ROUTE_NOTIFY:
        case DPLANE_OP_LSP_NOTIFY:
        case DPLANE_OP_BR_PORT_UPDATE:
                break;

        /* TODO -- error counters for incoming events? */
        case DPLANE_OP_INTF_ADDR_ADD:
        case DPLANE_OP_INTF_ADDR_DEL:
        case DPLANE_OP_INTF_NETCONFIG:
                break;

        case DPLANE_OP_NONE:
                if (res != ZEBRA_DPLANE_REQUEST_SUCCESS)
                        atomic_fetch_add_explicit(&zdplane_info.dg_other_errors,
                                                  1, memory_order_relaxed);
                break;
        }
}

static void kernel_dplane_process_iptable(struct zebra_dplane_provider *prov,
                                          struct zebra_dplane_ctx *ctx)
{
        zebra_pbr_process_iptable(ctx);
        dplane_provider_enqueue_out_ctx(prov, ctx);
}

static void kernel_dplane_process_ipset(struct zebra_dplane_provider *prov,
                                        struct zebra_dplane_ctx *ctx)
{
        zebra_pbr_process_ipset(ctx);
        dplane_provider_enqueue_out_ctx(prov, ctx);
}

static void
kernel_dplane_process_ipset_entry(struct zebra_dplane_provider *prov,
                                  struct zebra_dplane_ctx *ctx)
{
        zebra_pbr_process_ipset_entry(ctx);
        dplane_provider_enqueue_out_ctx(prov, ctx);
}

/*
 * Kernel provider callback
 */
static int kernel_dplane_process_func(struct zebra_dplane_provider *prov)
{
        struct zebra_dplane_ctx *ctx, *tctx;
        struct dplane_ctx_q work_list;
        int counter, limit;

        TAILQ_INIT(&work_list);

        limit = dplane_provider_get_work_limit(prov);

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("dplane provider '%s': processing",
                           dplane_provider_get_name(prov));

        for (counter = 0; counter < limit; counter++) {
                ctx = dplane_provider_dequeue_in_ctx(prov);
                if (ctx == NULL)
                        break;
                if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                        kernel_dplane_log_detail(ctx);

                if ((dplane_ctx_get_op(ctx) == DPLANE_OP_IPTABLE_ADD
                     || dplane_ctx_get_op(ctx) == DPLANE_OP_IPTABLE_DELETE))
                        kernel_dplane_process_iptable(prov, ctx);
                else if ((dplane_ctx_get_op(ctx) == DPLANE_OP_IPSET_ADD
                          || dplane_ctx_get_op(ctx) == DPLANE_OP_IPSET_DELETE))
                        kernel_dplane_process_ipset(prov, ctx);
                else if ((dplane_ctx_get_op(ctx) == DPLANE_OP_IPSET_ENTRY_ADD
                          || dplane_ctx_get_op(ctx)
                                     == DPLANE_OP_IPSET_ENTRY_DELETE))
                        kernel_dplane_process_ipset_entry(prov, ctx);
                else
                        TAILQ_INSERT_TAIL(&work_list, ctx, zd_q_entries);
        }

        kernel_update_multi(&work_list);

        TAILQ_FOREACH_SAFE (ctx, &work_list, zd_q_entries, tctx) {
                kernel_dplane_handle_result(ctx);

                TAILQ_REMOVE(&work_list, ctx, zd_q_entries);
                dplane_provider_enqueue_out_ctx(prov, ctx);
        }

        /* Ensure that we'll run the work loop again if there's still
         * more work to do.
         */
        if (counter >= limit) {
                if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                        zlog_debug("dplane provider '%s' reached max updates %d",
                                   dplane_provider_get_name(prov), counter);

                atomic_fetch_add_explicit(&zdplane_info.dg_update_yields,
                                          1, memory_order_relaxed);

                dplane_provider_work_ready();
        }

        return 0;
}

#ifdef DPLANE_TEST_PROVIDER

/*
 * Test dataplane provider plugin
 */

/*
 * Test provider process callback
 */
static int test_dplane_process_func(struct zebra_dplane_provider *prov)
{
        struct zebra_dplane_ctx *ctx;
        int counter, limit;

        /* Just moving from 'in' queue to 'out' queue */

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("dplane provider '%s': processing",
                           dplane_provider_get_name(prov));

        limit = dplane_provider_get_work_limit(prov);

        for (counter = 0; counter < limit; counter++) {
                ctx = dplane_provider_dequeue_in_ctx(prov);
                if (ctx == NULL)
                        break;

                if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                        zlog_debug("dplane provider '%s': op %s",
                                   dplane_provider_get_name(prov),
                                   dplane_op2str(dplane_ctx_get_op(ctx)));

                dplane_ctx_set_status(ctx, ZEBRA_DPLANE_REQUEST_SUCCESS);

                dplane_provider_enqueue_out_ctx(prov, ctx);
        }

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("dplane provider '%s': processed %d",
                           dplane_provider_get_name(prov), counter);

        /* Ensure that we'll run the work loop again if there's still
         * more work to do.
         */
        if (counter >= limit)
                dplane_provider_work_ready();

        return 0;
}

/*
 * Test provider shutdown/fini callback
 */
static int test_dplane_shutdown_func(struct zebra_dplane_provider *prov,
                                     bool early)
{
        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("dplane provider '%s': %sshutdown",
                           dplane_provider_get_name(prov),
                           early ? "early " : "");

        return 0;
}
#endif  /* DPLANE_TEST_PROVIDER */

/*
 * Register default kernel provider
 */
static void dplane_provider_init(void)
{
        int ret;

        ret = dplane_provider_register("Kernel",
                                       DPLANE_PRIO_KERNEL,
                                       DPLANE_PROV_FLAGS_DEFAULT, NULL,
                                       kernel_dplane_process_func,
                                       NULL,
                                       NULL, NULL);

        if (ret != AOK)
                zlog_err("Unable to register kernel dplane provider: %d",
                         ret);

#ifdef DPLANE_TEST_PROVIDER
        /* Optional test provider ... */
        ret = dplane_provider_register("Test",
                                       DPLANE_PRIO_PRE_KERNEL,
                                       DPLANE_PROV_FLAGS_DEFAULT, NULL,
                                       test_dplane_process_func,
                                       test_dplane_shutdown_func,
                                       NULL /* data */, NULL);

        if (ret != AOK)
                zlog_err("Unable to register test dplane provider: %d",
                         ret);
#endif  /* DPLANE_TEST_PROVIDER */
}

/*
 * Allow zebra code to walk the queue of pending contexts, evaluate each one
 * using a callback function. If the function returns 'true', the context
 * will be dequeued and freed without being processed.
 */
int dplane_clean_ctx_queue(bool (*context_cb)(struct zebra_dplane_ctx *ctx,
                                              void *arg), void *val)
{
        struct zebra_dplane_ctx *ctx, *temp;
        struct dplane_ctx_q work_list;

        TAILQ_INIT(&work_list);

        if (context_cb == NULL)
                goto done;

        /* Walk the pending context queue under the dplane lock. */
        DPLANE_LOCK();

        TAILQ_FOREACH_SAFE(ctx, &zdplane_info.dg_update_ctx_q, zd_q_entries,
                           temp) {
                if (context_cb(ctx, val)) {
                        TAILQ_REMOVE(&zdplane_info.dg_update_ctx_q, ctx,
                                     zd_q_entries);
                        TAILQ_INSERT_TAIL(&work_list, ctx, zd_q_entries);
                }
        }

        DPLANE_UNLOCK();

        /* Now free any contexts selected by the caller, without holding
         * the lock.
         */
        TAILQ_FOREACH_SAFE(ctx, &work_list, zd_q_entries, temp) {
                TAILQ_REMOVE(&work_list, ctx, zd_q_entries);
                dplane_ctx_fini(&ctx);
        }

done:

        return 0;
}

/* Indicates zebra shutdown/exit is in progress. Some operations may be
 * simplified or skipped during shutdown processing.
 */
bool dplane_is_in_shutdown(void)
{
        return zdplane_info.dg_is_shutdown;
}

/*
 * Enable collection of extra info about interfaces in route updates.
 */
void dplane_enable_intf_extra_info(void)
{
        dplane_collect_extra_intf_info = true;
}

/*
 * Early or pre-shutdown, de-init notification api. This runs pretty
 * early during zebra shutdown, as a signal to stop new work and prepare
 * for updates generated by shutdown/cleanup activity, as zebra tries to
 * remove everything it's responsible for.
 * NB: This runs in the main zebra pthread context.
 */
void zebra_dplane_pre_finish(void)
{
        struct zebra_dplane_provider *prov;

        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("Zebra dataplane pre-finish called");

        zdplane_info.dg_is_shutdown = true;

        /* Notify provider(s) of pending shutdown. */
        TAILQ_FOREACH(prov, &zdplane_info.dg_providers_q, dp_prov_link) {
                if (prov->dp_fini == NULL)
                        continue;

                prov->dp_fini(prov, true /* early */);
        }
}

/*
 * Utility to determine whether work remains enqueued within the dplane;
 * used during system shutdown processing.
 */
static bool dplane_work_pending(void)
{
        bool ret = false;
        struct zebra_dplane_ctx *ctx;
        struct zebra_dplane_provider *prov;

        /* TODO -- just checking incoming/pending work for now, must check
         * providers
         */
        DPLANE_LOCK();
        {
                ctx = TAILQ_FIRST(&zdplane_info.dg_update_ctx_q);
                prov = TAILQ_FIRST(&zdplane_info.dg_providers_q);
        }
        DPLANE_UNLOCK();

        if (ctx != NULL) {
                ret = true;
                goto done;
        }

        while (prov) {

                dplane_provider_lock(prov);

                ctx = TAILQ_FIRST(&(prov->dp_ctx_in_q));
                if (ctx == NULL)
                        ctx = TAILQ_FIRST(&(prov->dp_ctx_out_q));

                dplane_provider_unlock(prov);

                if (ctx != NULL)
                        break;

                DPLANE_LOCK();
                prov = TAILQ_NEXT(prov, dp_prov_link);
                DPLANE_UNLOCK();
        }

        if (ctx != NULL)
                ret = true;

done:
        return ret;
}

/*
 * Shutdown-time intermediate callback, used to determine when all pending
 * in-flight updates are done. If there's still work to do, reschedules itself.
 * If all work is done, schedules an event to the main zebra thread for
 * final zebra shutdown.
 * This runs in the dplane pthread context.
 */
static void dplane_check_shutdown_status(struct thread *event)
{
        struct dplane_zns_info *zi;

        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("Zebra dataplane shutdown status check called");

        /* Remove any zns info entries as we stop the dplane pthread. */
        frr_each_safe (zns_info_list, &zdplane_info.dg_zns_list, zi) {
                zns_info_list_del(&zdplane_info.dg_zns_list, zi);

                if (zdplane_info.dg_master) {
                        thread_cancel(&zi->t_read);
                        thread_cancel(&zi->t_request);
                }

                XFREE(MTYPE_DP_NS, zi);
        }

        if (dplane_work_pending()) {
                /* Reschedule dplane check on a short timer */
                thread_add_timer_msec(zdplane_info.dg_master,
                                      dplane_check_shutdown_status,
                                      NULL, 100,
                                      &zdplane_info.dg_t_shutdown_check);

                /* TODO - give up and stop waiting after a short time? */

        } else {
                /* We appear to be done - schedule a final callback event
                 * for the zebra main pthread.
                 */
                thread_add_event(zrouter.master, zebra_finalize, NULL, 0, NULL);
        }
}

/*
 * Shutdown, de-init api. This runs pretty late during shutdown,
 * after zebra has tried to free/remove/uninstall all routes during shutdown.
 * At this point, dplane work may still remain to be done, so we can't just
 * blindly terminate. If there's still work to do, we'll periodically check
 * and when done, we'll enqueue a task to the zebra main thread for final
 * termination processing.
 *
 * NB: This runs in the main zebra thread context.
 */
void zebra_dplane_finish(void)
{
        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("Zebra dataplane fini called");

        thread_add_event(zdplane_info.dg_master,
                         dplane_check_shutdown_status, NULL, 0,
                         &zdplane_info.dg_t_shutdown_check);
}

/*
 * Main dataplane pthread event loop. The thread takes new incoming work
 * and offers it to the first provider. It then iterates through the
 * providers, taking complete work from each one and offering it
 * to the next in order. At each step, a limited number of updates are
 * processed during a cycle in order to provide some fairness.
 *
 * This loop through the providers is only run once, so that the dataplane
 * pthread can look for other pending work - such as i/o work on behalf of
 * providers.
 */
static void dplane_thread_loop(struct thread *event)
{
        struct dplane_ctx_q work_list;
        struct dplane_ctx_q error_list;
        struct zebra_dplane_provider *prov;
        struct zebra_dplane_ctx *ctx, *tctx;
        int limit, counter, error_counter;
        uint64_t curr, high;
        bool reschedule = false;

        /* Capture work limit per cycle */
        limit = zdplane_info.dg_updates_per_cycle;

        /* Init temporary lists used to move contexts among providers */
        TAILQ_INIT(&work_list);
        TAILQ_INIT(&error_list);
        error_counter = 0;

        /* Check for zebra shutdown */
        if (!zdplane_info.dg_run)
                return;

        /* Dequeue some incoming work from zebra (if any) onto the temporary
         * working list.
         */
        DPLANE_LOCK();

        /* Locate initial registered provider */
        prov = TAILQ_FIRST(&zdplane_info.dg_providers_q);

        /* Move new work from incoming list to temp list */
        for (counter = 0; counter < limit; counter++) {
                ctx = TAILQ_FIRST(&zdplane_info.dg_update_ctx_q);
                if (ctx) {
                        TAILQ_REMOVE(&zdplane_info.dg_update_ctx_q, ctx,
                                     zd_q_entries);

                        ctx->zd_provider = prov->dp_id;

                        TAILQ_INSERT_TAIL(&work_list, ctx, zd_q_entries);
                } else {
                        break;
                }
        }

        DPLANE_UNLOCK();

        atomic_fetch_sub_explicit(&zdplane_info.dg_routes_queued, counter,
                                  memory_order_relaxed);

        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("dplane: incoming new work counter: %d", counter);

        /* Iterate through the registered providers, offering new incoming
         * work. If the provider has outgoing work in its queue, take that
         * work for the next provider
         */
        while (prov) {

                /* At each iteration, the temporary work list has 'counter'
                 * items.
                 */
                if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                        zlog_debug("dplane enqueues %d new work to provider '%s'",
                                   counter, dplane_provider_get_name(prov));

                /* Capture current provider id in each context; check for
                 * error status.
                 */
                TAILQ_FOREACH_SAFE(ctx, &work_list, zd_q_entries, tctx) {
                        if (dplane_ctx_get_status(ctx) ==
                            ZEBRA_DPLANE_REQUEST_SUCCESS) {
                                ctx->zd_provider = prov->dp_id;
                        } else {
                                /*
                                 * TODO -- improve error-handling: recirc
                                 * errors backwards so that providers can
                                 * 'undo' their work (if they want to)
                                 */

                                /* Move to error list; will be returned
                                 * zebra main.
                                 */
                                TAILQ_REMOVE(&work_list, ctx, zd_q_entries);
                                TAILQ_INSERT_TAIL(&error_list,
                                                  ctx, zd_q_entries);
                                error_counter++;
                        }
                }

                /* Enqueue new work to the provider */
                dplane_provider_lock(prov);

                if (TAILQ_FIRST(&work_list))
                        TAILQ_CONCAT(&(prov->dp_ctx_in_q), &work_list,
                                     zd_q_entries);

                atomic_fetch_add_explicit(&prov->dp_in_counter, counter,
                                          memory_order_relaxed);
                atomic_fetch_add_explicit(&prov->dp_in_queued, counter,
                                          memory_order_relaxed);
                curr = atomic_load_explicit(&prov->dp_in_queued,
                                            memory_order_relaxed);
                high = atomic_load_explicit(&prov->dp_in_max,
                                            memory_order_relaxed);
                if (curr > high)
                        atomic_store_explicit(&prov->dp_in_max, curr,
                                              memory_order_relaxed);

                dplane_provider_unlock(prov);

                /* Reset the temp list (though the 'concat' may have done this
                 * already), and the counter
                 */
                TAILQ_INIT(&work_list);
                counter = 0;

                /* Call into the provider code. Note that this is
                 * unconditional: we offer to do work even if we don't enqueue
                 * any _new_ work.
                 */
                (*prov->dp_fp)(prov);

                /* Check for zebra shutdown */
                if (!zdplane_info.dg_run)
                        break;

                /* Dequeue completed work from the provider */
                dplane_provider_lock(prov);

                while (counter < limit) {
                        ctx = TAILQ_FIRST(&(prov->dp_ctx_out_q));
                        if (ctx) {
                                TAILQ_REMOVE(&(prov->dp_ctx_out_q), ctx,
                                             zd_q_entries);

                                TAILQ_INSERT_TAIL(&work_list,
                                                  ctx, zd_q_entries);
                                counter++;
                        } else
                                break;
                }

                dplane_provider_unlock(prov);

                if (counter >= limit)
                        reschedule = true;

                if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                        zlog_debug("dplane dequeues %d completed work from provider %s",
                                   counter, dplane_provider_get_name(prov));

                /* Locate next provider */
                DPLANE_LOCK();
                prov = TAILQ_NEXT(prov, dp_prov_link);
                DPLANE_UNLOCK();
        }

        /*
         * We hit the work limit while processing at least one provider's
         * output queue - ensure we come back and finish it.
         */
        if (reschedule)
                dplane_provider_work_ready();

        /* After all providers have been serviced, enqueue any completed
         * work and any errors back to zebra so it can process the results.
         */
        if (IS_ZEBRA_DEBUG_DPLANE_DETAIL)
                zlog_debug("dplane has %d completed, %d errors, for zebra main",
                           counter, error_counter);

        /*
         * Hand lists through the api to zebra main,
         * to reduce the number of lock/unlock cycles
         */

        /* Call through to zebra main */
        (zdplane_info.dg_results_cb)(&error_list);

        TAILQ_INIT(&error_list);

        /* Call through to zebra main */
        (zdplane_info.dg_results_cb)(&work_list);

        TAILQ_INIT(&work_list);
}

/*
 * Final phase of shutdown, after all work enqueued to dplane has been
 * processed. This is called from the zebra main pthread context.
 */
void zebra_dplane_shutdown(void)
{
        struct zebra_dplane_provider *dp;

        if (IS_ZEBRA_DEBUG_DPLANE)
                zlog_debug("Zebra dataplane shutdown called");

        /* Stop dplane thread, if it's running */

        zdplane_info.dg_run = false;

        if (zdplane_info.dg_t_update)
                thread_cancel_async(zdplane_info.dg_t_update->master,
                                    &zdplane_info.dg_t_update, NULL);

        frr_pthread_stop(zdplane_info.dg_pthread, NULL);

        /* Destroy pthread */
        frr_pthread_destroy(zdplane_info.dg_pthread);
        zdplane_info.dg_pthread = NULL;
        zdplane_info.dg_master = NULL;

        /* Notify provider(s) of final shutdown.
         * Note that this call is in the main pthread, so providers must
         * be prepared for that.
         */
        TAILQ_FOREACH(dp, &zdplane_info.dg_providers_q, dp_prov_link) {
                if (dp->dp_fini == NULL)
                        continue;

                dp->dp_fini(dp, false);
        }

        /* TODO -- Clean-up provider objects */

        /* TODO -- Clean queue(s), free memory */
}

/*
 * Initialize the dataplane module during startup, internal/private version
 */
static void zebra_dplane_init_internal(void)
{
        memset(&zdplane_info, 0, sizeof(zdplane_info));

        pthread_mutex_init(&zdplane_info.dg_mutex, NULL);

        TAILQ_INIT(&zdplane_info.dg_update_ctx_q);
        TAILQ_INIT(&zdplane_info.dg_providers_q);
        zns_info_list_init(&zdplane_info.dg_zns_list);

        zdplane_info.dg_updates_per_cycle = DPLANE_DEFAULT_NEW_WORK;

        zdplane_info.dg_max_queued_updates = DPLANE_DEFAULT_MAX_QUEUED;

        /* Register default kernel 'provider' during init */
        dplane_provider_init();
}

/*
 * Start the dataplane pthread. This step needs to be run later than the
 * 'init' step, in case zebra has fork-ed.
 */
void zebra_dplane_start(void)
{
        struct dplane_zns_info *zi;
        struct zebra_dplane_provider *prov;
        struct frr_pthread_attr pattr = {
                .start = frr_pthread_attr_default.start,
                .stop = frr_pthread_attr_default.stop
        };

        /* Start dataplane pthread */

        zdplane_info.dg_pthread = frr_pthread_new(&pattr, "Zebra dplane thread",
                                                  "zebra_dplane");

        zdplane_info.dg_master = zdplane_info.dg_pthread->master;

        zdplane_info.dg_run = true;

        /* Enqueue an initial event for the dataplane pthread */
        thread_add_event(zdplane_info.dg_master, dplane_thread_loop, NULL, 0,
                         &zdplane_info.dg_t_update);

        /* Enqueue requests and reads if necessary */
        frr_each (zns_info_list, &zdplane_info.dg_zns_list, zi) {
#if defined(HAVE_NETLINK)
                thread_add_read(zdplane_info.dg_master, dplane_incoming_read,
                                zi, zi->info.sock, &zi->t_read);
                dplane_kernel_info_request(zi);
#endif
        }

        /* Call start callbacks for registered providers */

        DPLANE_LOCK();
        prov = TAILQ_FIRST(&zdplane_info.dg_providers_q);
        DPLANE_UNLOCK();

        while (prov) {

                if (prov->dp_start)
                        (prov->dp_start)(prov);

                /* Locate next provider */
                DPLANE_LOCK();
                prov = TAILQ_NEXT(prov, dp_prov_link);
                DPLANE_UNLOCK();
        }

        frr_pthread_run(zdplane_info.dg_pthread, NULL);
}

/*
 * Initialize the dataplane module at startup; called by zebra rib_init()
 */
void zebra_dplane_init(int (*results_fp)(struct dplane_ctx_q *))
{
        zebra_dplane_init_internal();
        zdplane_info.dg_results_cb = results_fp;
}