Merge branch 'cpufreq/arm/linux-next' of git://git.kernel.org/pub/scm/linux/kernel...

[mirror_ubuntu-jammy-kernel.git] / include / net / pkt_cls.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_PKT_CLS_H
#define __NET_PKT_CLS_H

#include <linux/pkt_cls.h>
#include <linux/workqueue.h>
#include <net/sch_generic.h>
#include <net/act_api.h>
#include <net/net_namespace.h>

/* TC action not accessible from user space */
#define TC_ACT_CONSUMED         (TC_ACT_VALUE_MAX + 1)

/* Basic packet classifier frontend definitions. */

struct tcf_walker {
        int     stop;
        int     skip;
        int     count;
        bool    nonempty;
        unsigned long cookie;
        int     (*fn)(struct tcf_proto *, void *node, struct tcf_walker *);
};

int register_tcf_proto_ops(struct tcf_proto_ops *ops);
int unregister_tcf_proto_ops(struct tcf_proto_ops *ops);

struct tcf_block_ext_info {
        enum flow_block_binder_type binder_type;
        tcf_chain_head_change_t *chain_head_change;
        void *chain_head_change_priv;
        u32 block_index;
};

struct tcf_qevent {
        struct tcf_block        *block;
        struct tcf_block_ext_info info;
        struct tcf_proto __rcu *filter_chain;
};

struct tcf_block_cb;
bool tcf_queue_work(struct rcu_work *rwork, work_func_t func);

#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block,
                                       u32 chain_index);
void tcf_chain_put_by_act(struct tcf_chain *chain);
struct tcf_chain *tcf_get_next_chain(struct tcf_block *block,
                                     struct tcf_chain *chain);
struct tcf_proto *tcf_get_next_proto(struct tcf_chain *chain,
                                     struct tcf_proto *tp);
void tcf_block_netif_keep_dst(struct tcf_block *block);
int tcf_block_get(struct tcf_block **p_block,
                  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
                  struct netlink_ext_ack *extack);
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
                      struct tcf_block_ext_info *ei,
                      struct netlink_ext_ack *extack);
void tcf_block_put(struct tcf_block *block);
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
                       struct tcf_block_ext_info *ei);

static inline bool tcf_block_shared(struct tcf_block *block)
{
        return block->index;
}

static inline bool tcf_block_non_null_shared(struct tcf_block *block)
{
        return block && block->index;
}

static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
{
        WARN_ON(tcf_block_shared(block));
        return block->q;
}

int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
                 struct tcf_result *res, bool compat_mode);
int tcf_classify_ingress(struct sk_buff *skb,
                         const struct tcf_block *ingress_block,
                         const struct tcf_proto *tp, struct tcf_result *res,
                         bool compat_mode);

#else
static inline bool tcf_block_shared(struct tcf_block *block)
{
        return false;
}

static inline bool tcf_block_non_null_shared(struct tcf_block *block)
{
        return false;
}

static inline
int tcf_block_get(struct tcf_block **p_block,
                  struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
                  struct netlink_ext_ack *extack)
{
        return 0;
}

static inline
int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q,
                      struct tcf_block_ext_info *ei,
                      struct netlink_ext_ack *extack)
{
        return 0;
}

static inline void tcf_block_put(struct tcf_block *block)
{
}

static inline
void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
                       struct tcf_block_ext_info *ei)
{
}

static inline struct Qdisc *tcf_block_q(struct tcf_block *block)
{
        return NULL;
}

static inline
int tc_setup_cb_block_register(struct tcf_block *block, flow_setup_cb_t *cb,
                               void *cb_priv)
{
        return 0;
}

static inline
void tc_setup_cb_block_unregister(struct tcf_block *block, flow_setup_cb_t *cb,
                                  void *cb_priv)
{
}

static inline int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
                               struct tcf_result *res, bool compat_mode)
{
        return TC_ACT_UNSPEC;
}

static inline int tcf_classify_ingress(struct sk_buff *skb,
                                       const struct tcf_block *ingress_block,
                                       const struct tcf_proto *tp,
                                       struct tcf_result *res, bool compat_mode)
{
        return TC_ACT_UNSPEC;
}

#endif

static inline unsigned long
__cls_set_class(unsigned long *clp, unsigned long cl)
{
        return xchg(clp, cl);
}

static inline void
__tcf_bind_filter(struct Qdisc *q, struct tcf_result *r, unsigned long base)
{
        unsigned long cl;

        cl = q->ops->cl_ops->bind_tcf(q, base, r->classid);
        cl = __cls_set_class(&r->class, cl);
        if (cl)
                q->ops->cl_ops->unbind_tcf(q, cl);
}

static inline void
tcf_bind_filter(struct tcf_proto *tp, struct tcf_result *r, unsigned long base)
{
        struct Qdisc *q = tp->chain->block->q;

        /* Check q as it is not set for shared blocks. In that case,
         * setting class is not supported.
         */
        if (!q)
                return;
        sch_tree_lock(q);
        __tcf_bind_filter(q, r, base);
        sch_tree_unlock(q);
}

static inline void
__tcf_unbind_filter(struct Qdisc *q, struct tcf_result *r)
{
        unsigned long cl;

        if ((cl = __cls_set_class(&r->class, 0)) != 0)
                q->ops->cl_ops->unbind_tcf(q, cl);
}

static inline void
tcf_unbind_filter(struct tcf_proto *tp, struct tcf_result *r)
{
        struct Qdisc *q = tp->chain->block->q;

        if (!q)
                return;
        __tcf_unbind_filter(q, r);
}

struct tcf_exts {
#ifdef CONFIG_NET_CLS_ACT
        __u32   type; /* for backward compat(TCA_OLD_COMPAT) */
        int nr_actions;
        struct tc_action **actions;
        struct net *net;
#endif
        /* Map to export classifier specific extension TLV types to the
         * generic extensions API. Unsupported extensions must be set to 0.
         */
        int action;
        int police;
};

static inline int tcf_exts_init(struct tcf_exts *exts, struct net *net,
                                int action, int police)
{
#ifdef CONFIG_NET_CLS_ACT
        exts->type = 0;
        exts->nr_actions = 0;
        exts->net = net;
        exts->actions = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *),
                                GFP_KERNEL);
        if (!exts->actions)
                return -ENOMEM;
#endif
        exts->action = action;
        exts->police = police;
        return 0;
}

/* Return false if the netns is being destroyed in cleanup_net(). Callers
 * need to do cleanup synchronously in this case, otherwise may race with
 * tc_action_net_exit(). Return true for other cases.
 */
static inline bool tcf_exts_get_net(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
        exts->net = maybe_get_net(exts->net);
        return exts->net != NULL;
#else
        return true;
#endif
}

static inline void tcf_exts_put_net(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
        if (exts->net)
                put_net(exts->net);
#endif
}

#ifdef CONFIG_NET_CLS_ACT
#define tcf_exts_for_each_action(i, a, exts) \
        for (i = 0; i < TCA_ACT_MAX_PRIO && ((a) = (exts)->actions[i]); i++)
#else
#define tcf_exts_for_each_action(i, a, exts) \
        for (; 0; (void)(i), (void)(a), (void)(exts))
#endif

static inline void
tcf_exts_stats_update(const struct tcf_exts *exts,
                      u64 bytes, u64 packets, u64 drops, u64 lastuse,
                      u8 used_hw_stats, bool used_hw_stats_valid)
{
#ifdef CONFIG_NET_CLS_ACT
        int i;

        preempt_disable();

        for (i = 0; i < exts->nr_actions; i++) {
                struct tc_action *a = exts->actions[i];

                tcf_action_stats_update(a, bytes, packets, drops,
                                        lastuse, true);
                a->used_hw_stats = used_hw_stats;
                a->used_hw_stats_valid = used_hw_stats_valid;
        }

        preempt_enable();
#endif
}

/**
 * tcf_exts_has_actions - check if at least one action is present
 * @exts: tc filter extensions handle
 *
 * Returns true if at least one action is present.
 */
static inline bool tcf_exts_has_actions(struct tcf_exts *exts)
{
#ifdef CONFIG_NET_CLS_ACT
        return exts->nr_actions;
#else
        return false;
#endif
}

/**
 * tcf_exts_exec - execute tc filter extensions
 * @skb: socket buffer
 * @exts: tc filter extensions handle
 * @res: desired result
 *
 * Executes all configured extensions. Returns TC_ACT_OK on a normal execution,
 * a negative number if the filter must be considered unmatched or
 * a positive action code (TC_ACT_*) which must be returned to the
 * underlying layer.
 */
static inline int
tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
              struct tcf_result *res)
{
#ifdef CONFIG_NET_CLS_ACT
        return tcf_action_exec(skb, exts->actions, exts->nr_actions, res);
#endif
        return TC_ACT_OK;
}

int tcf_exts_validate(struct net *net, struct tcf_proto *tp,
                      struct nlattr **tb, struct nlattr *rate_tlv,
                      struct tcf_exts *exts, bool ovr, bool rtnl_held,
                      struct netlink_ext_ack *extack);
void tcf_exts_destroy(struct tcf_exts *exts);
void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src);
int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);
int tcf_exts_terse_dump(struct sk_buff *skb, struct tcf_exts *exts);
int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts);

/**
 * struct tcf_pkt_info - packet information
 *
 * @ptr: start of the pkt data
 * @nexthdr: offset of the next header
 */
struct tcf_pkt_info {
        unsigned char *         ptr;
        int                     nexthdr;
};

#ifdef CONFIG_NET_EMATCH

struct tcf_ematch_ops;

/**
 * struct tcf_ematch - extended match (ematch)
 * 
 * @matchid: identifier to allow userspace to reidentify a match
 * @flags: flags specifying attributes and the relation to other matches
 * @ops: the operations lookup table of the corresponding ematch module
 * @datalen: length of the ematch specific configuration data
 * @data: ematch specific data
 * @net: the network namespace
 */
struct tcf_ematch {
        struct tcf_ematch_ops * ops;
        unsigned long           data;
        unsigned int            datalen;
        u16                     matchid;
        u16                     flags;
        struct net              *net;
};

static inline int tcf_em_is_container(struct tcf_ematch *em)
{
        return !em->ops;
}

static inline int tcf_em_is_simple(struct tcf_ematch *em)
{
        return em->flags & TCF_EM_SIMPLE;
}

static inline int tcf_em_is_inverted(struct tcf_ematch *em)
{
        return em->flags & TCF_EM_INVERT;
}

static inline int tcf_em_last_match(struct tcf_ematch *em)
{
        return (em->flags & TCF_EM_REL_MASK) == TCF_EM_REL_END;
}

static inline int tcf_em_early_end(struct tcf_ematch *em, int result)
{
        if (tcf_em_last_match(em))
                return 1;

        if (result == 0 && em->flags & TCF_EM_REL_AND)
                return 1;

        if (result != 0 && em->flags & TCF_EM_REL_OR)
                return 1;

        return 0;
}
        
/**
 * struct tcf_ematch_tree - ematch tree handle
 *
 * @hdr: ematch tree header supplied by userspace
 * @matches: array of ematches
 */
struct tcf_ematch_tree {
        struct tcf_ematch_tree_hdr hdr;
        struct tcf_ematch *     matches;
        
};

/**
 * struct tcf_ematch_ops - ematch module operations
 * 
 * @kind: identifier (kind) of this ematch module
 * @datalen: length of expected configuration data (optional)
 * @change: called during validation (optional)
 * @match: called during ematch tree evaluation, must return 1/0
 * @destroy: called during destroyage (optional)
 * @dump: called during dumping process (optional)
 * @owner: owner, must be set to THIS_MODULE
 * @link: link to previous/next ematch module (internal use)
 */
struct tcf_ematch_ops {
        int                     kind;
        int                     datalen;
        int                     (*change)(struct net *net, void *,
                                          int, struct tcf_ematch *);
        int                     (*match)(struct sk_buff *, struct tcf_ematch *,
                                         struct tcf_pkt_info *);
        void                    (*destroy)(struct tcf_ematch *);
        int                     (*dump)(struct sk_buff *, struct tcf_ematch *);
        struct module           *owner;
        struct list_head        link;
};

int tcf_em_register(struct tcf_ematch_ops *);
void tcf_em_unregister(struct tcf_ematch_ops *);
int tcf_em_tree_validate(struct tcf_proto *, struct nlattr *,
                         struct tcf_ematch_tree *);
void tcf_em_tree_destroy(struct tcf_ematch_tree *);
int tcf_em_tree_dump(struct sk_buff *, struct tcf_ematch_tree *, int);
int __tcf_em_tree_match(struct sk_buff *, struct tcf_ematch_tree *,
                        struct tcf_pkt_info *);

/**
 * tcf_em_tree_match - evaulate an ematch tree
 *
 * @skb: socket buffer of the packet in question
 * @tree: ematch tree to be used for evaluation
 * @info: packet information examined by classifier
 *
 * This function matches @skb against the ematch tree in @tree by going
 * through all ematches respecting their logic relations returning
 * as soon as the result is obvious.
 *
 * Returns 1 if the ematch tree as-one matches, no ematches are configured
 * or ematch is not enabled in the kernel, otherwise 0 is returned.
 */
static inline int tcf_em_tree_match(struct sk_buff *skb,
                                    struct tcf_ematch_tree *tree,
                                    struct tcf_pkt_info *info)
{
        if (tree->hdr.nmatches)
                return __tcf_em_tree_match(skb, tree, info);
        else
                return 1;
}

#define MODULE_ALIAS_TCF_EMATCH(kind)   MODULE_ALIAS("ematch-kind-" __stringify(kind))

#else /* CONFIG_NET_EMATCH */

struct tcf_ematch_tree {
};

#define tcf_em_tree_validate(tp, tb, t) ((void)(t), 0)
#define tcf_em_tree_destroy(t) do { (void)(t); } while(0)
#define tcf_em_tree_dump(skb, t, tlv) (0)
#define tcf_em_tree_match(skb, t, info) ((void)(info), 1)

#endif /* CONFIG_NET_EMATCH */

static inline unsigned char * tcf_get_base_ptr(struct sk_buff *skb, int layer)
{
        switch (layer) {
                case TCF_LAYER_LINK:
                        return skb_mac_header(skb);
                case TCF_LAYER_NETWORK:
                        return skb_network_header(skb);
                case TCF_LAYER_TRANSPORT:
                        return skb_transport_header(skb);
        }

        return NULL;
}

static inline int tcf_valid_offset(const struct sk_buff *skb,
                                   const unsigned char *ptr, const int len)
{
        return likely((ptr + len) <= skb_tail_pointer(skb) &&
                      ptr >= skb->head &&
                      (ptr <= (ptr + len)));
}

static inline int
tcf_change_indev(struct net *net, struct nlattr *indev_tlv,
                 struct netlink_ext_ack *extack)
{
        char indev[IFNAMSIZ];
        struct net_device *dev;

        if (nla_strscpy(indev, indev_tlv, IFNAMSIZ) < 0) {
                NL_SET_ERR_MSG_ATTR(extack, indev_tlv,
                                    "Interface name too long");
                return -EINVAL;
        }
        dev = __dev_get_by_name(net, indev);
        if (!dev) {
                NL_SET_ERR_MSG_ATTR(extack, indev_tlv,
                                    "Network device not found");
                return -ENODEV;
        }
        return dev->ifindex;
}

static inline bool
tcf_match_indev(struct sk_buff *skb, int ifindex)
{
        if (!ifindex)
                return true;
        if  (!skb->skb_iif)
                return false;
        return ifindex == skb->skb_iif;
}

int tc_setup_flow_action(struct flow_action *flow_action,
                         const struct tcf_exts *exts);
void tc_cleanup_flow_action(struct flow_action *flow_action);

int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
                     void *type_data, bool err_stop, bool rtnl_held);
int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
                    enum tc_setup_type type, void *type_data, bool err_stop,
                    u32 *flags, unsigned int *in_hw_count, bool rtnl_held);
int tc_setup_cb_replace(struct tcf_block *block, struct tcf_proto *tp,
                        enum tc_setup_type type, void *type_data, bool err_stop,
                        u32 *old_flags, unsigned int *old_in_hw_count,
                        u32 *new_flags, unsigned int *new_in_hw_count,
                        bool rtnl_held);
int tc_setup_cb_destroy(struct tcf_block *block, struct tcf_proto *tp,
                        enum tc_setup_type type, void *type_data, bool err_stop,
                        u32 *flags, unsigned int *in_hw_count, bool rtnl_held);
int tc_setup_cb_reoffload(struct tcf_block *block, struct tcf_proto *tp,
                          bool add, flow_setup_cb_t *cb,
                          enum tc_setup_type type, void *type_data,
                          void *cb_priv, u32 *flags, unsigned int *in_hw_count);
unsigned int tcf_exts_num_actions(struct tcf_exts *exts);

#ifdef CONFIG_NET_CLS_ACT
int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
                    enum flow_block_binder_type binder_type,
                    struct nlattr *block_index_attr,
                    struct netlink_ext_ack *extack);
void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch);
int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
                               struct netlink_ext_ack *extack);
struct sk_buff *tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
                                  struct sk_buff **to_free, int *ret);
int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe);
#else
static inline int tcf_qevent_init(struct tcf_qevent *qe, struct Qdisc *sch,
                                  enum flow_block_binder_type binder_type,
                                  struct nlattr *block_index_attr,
                                  struct netlink_ext_ack *extack)
{
        return 0;
}

static inline void tcf_qevent_destroy(struct tcf_qevent *qe, struct Qdisc *sch)
{
}

static inline int tcf_qevent_validate_change(struct tcf_qevent *qe, struct nlattr *block_index_attr,
                                             struct netlink_ext_ack *extack)
{
        return 0;
}

static inline struct sk_buff *
tcf_qevent_handle(struct tcf_qevent *qe, struct Qdisc *sch, struct sk_buff *skb,
                  struct sk_buff **to_free, int *ret)
{
        return skb;
}

static inline int tcf_qevent_dump(struct sk_buff *skb, int attr_name, struct tcf_qevent *qe)
{
        return 0;
}
#endif

struct tc_cls_u32_knode {
        struct tcf_exts *exts;
        struct tcf_result *res;
        struct tc_u32_sel *sel;
        u32 handle;
        u32 val;
        u32 mask;
        u32 link_handle;
        u8 fshift;
};

struct tc_cls_u32_hnode {
        u32 handle;
        u32 prio;
        unsigned int divisor;
};

enum tc_clsu32_command {
        TC_CLSU32_NEW_KNODE,
        TC_CLSU32_REPLACE_KNODE,
        TC_CLSU32_DELETE_KNODE,
        TC_CLSU32_NEW_HNODE,
        TC_CLSU32_REPLACE_HNODE,
        TC_CLSU32_DELETE_HNODE,
};

struct tc_cls_u32_offload {
        struct flow_cls_common_offload common;
        /* knode values */
        enum tc_clsu32_command command;
        union {
                struct tc_cls_u32_knode knode;
                struct tc_cls_u32_hnode hnode;
        };
};

static inline bool tc_can_offload(const struct net_device *dev)
{
        return dev->features & NETIF_F_HW_TC;
}

static inline bool tc_can_offload_extack(const struct net_device *dev,
                                         struct netlink_ext_ack *extack)
{
        bool can = tc_can_offload(dev);

        if (!can)
                NL_SET_ERR_MSG(extack, "TC offload is disabled on net device");

        return can;
}

static inline bool
tc_cls_can_offload_and_chain0(const struct net_device *dev,
                              struct flow_cls_common_offload *common)
{
        if (!tc_can_offload_extack(dev, common->extack))
                return false;
        if (common->chain_index) {
                NL_SET_ERR_MSG(common->extack,
                               "Driver supports only offload of chain 0");
                return false;
        }
        return true;
}

static inline bool tc_skip_hw(u32 flags)
{
        return (flags & TCA_CLS_FLAGS_SKIP_HW) ? true : false;
}

static inline bool tc_skip_sw(u32 flags)
{
        return (flags & TCA_CLS_FLAGS_SKIP_SW) ? true : false;
}

/* SKIP_HW and SKIP_SW are mutually exclusive flags. */
static inline bool tc_flags_valid(u32 flags)
{
        if (flags & ~(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW |
                      TCA_CLS_FLAGS_VERBOSE))
                return false;

        flags &= TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW;
        if (!(flags ^ (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)))
                return false;

        return true;
}

static inline bool tc_in_hw(u32 flags)
{
        return (flags & TCA_CLS_FLAGS_IN_HW) ? true : false;
}

static inline void
tc_cls_common_offload_init(struct flow_cls_common_offload *cls_common,
                           const struct tcf_proto *tp, u32 flags,
                           struct netlink_ext_ack *extack)
{
        cls_common->chain_index = tp->chain->index;
        cls_common->protocol = tp->protocol;
        cls_common->prio = tp->prio >> 16;
        if (tc_skip_sw(flags) || flags & TCA_CLS_FLAGS_VERBOSE)
                cls_common->extack = extack;
}

#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
static inline struct tc_skb_ext *tc_skb_ext_alloc(struct sk_buff *skb)
{
        struct tc_skb_ext *tc_skb_ext = skb_ext_add(skb, TC_SKB_EXT);

        if (tc_skb_ext)
                memset(tc_skb_ext, 0, sizeof(*tc_skb_ext));
        return tc_skb_ext;
}
#endif

enum tc_matchall_command {
        TC_CLSMATCHALL_REPLACE,
        TC_CLSMATCHALL_DESTROY,
        TC_CLSMATCHALL_STATS,
};

struct tc_cls_matchall_offload {
        struct flow_cls_common_offload common;
        enum tc_matchall_command command;
        struct flow_rule *rule;
        struct flow_stats stats;
        unsigned long cookie;
};

enum tc_clsbpf_command {
        TC_CLSBPF_OFFLOAD,
        TC_CLSBPF_STATS,
};

struct tc_cls_bpf_offload {
        struct flow_cls_common_offload common;
        enum tc_clsbpf_command command;
        struct tcf_exts *exts;
        struct bpf_prog *prog;
        struct bpf_prog *oldprog;
        const char *name;
        bool exts_integrated;
};

struct tc_mqprio_qopt_offload {
        /* struct tc_mqprio_qopt must always be the first element */
        struct tc_mqprio_qopt qopt;
        u16 mode;
        u16 shaper;
        u32 flags;
        u64 min_rate[TC_QOPT_MAX_QUEUE];
        u64 max_rate[TC_QOPT_MAX_QUEUE];
};

/* This structure holds cookie structure that is passed from user
 * to the kernel for actions and classifiers
 */
struct tc_cookie {
        u8  *data;
        u32 len;
        struct rcu_head rcu;
};

struct tc_qopt_offload_stats {
        struct gnet_stats_basic_packed *bstats;
        struct gnet_stats_queue *qstats;
};

enum tc_mq_command {
        TC_MQ_CREATE,
        TC_MQ_DESTROY,
        TC_MQ_STATS,
        TC_MQ_GRAFT,
};

struct tc_mq_opt_offload_graft_params {
        unsigned long queue;
        u32 child_handle;
};

struct tc_mq_qopt_offload {
        enum tc_mq_command command;
        u32 handle;
        union {
                struct tc_qopt_offload_stats stats;
                struct tc_mq_opt_offload_graft_params graft_params;
        };
};

enum tc_htb_command {
        /* Root */
        TC_HTB_CREATE, /* Initialize HTB offload. */
        TC_HTB_DESTROY, /* Destroy HTB offload. */

        /* Classes */
        /* Allocate qid and create leaf. */
        TC_HTB_LEAF_ALLOC_QUEUE,
        /* Convert leaf to inner, preserve and return qid, create new leaf. */
        TC_HTB_LEAF_TO_INNER,
        /* Delete leaf, while siblings remain. */
        TC_HTB_LEAF_DEL,
        /* Delete leaf, convert parent to leaf, preserving qid. */
        TC_HTB_LEAF_DEL_LAST,
        /* TC_HTB_LEAF_DEL_LAST, but delete driver data on hardware errors. */
        TC_HTB_LEAF_DEL_LAST_FORCE,
        /* Modify parameters of a node. */
        TC_HTB_NODE_MODIFY,

        /* Class qdisc */
        TC_HTB_LEAF_QUERY_QUEUE, /* Query qid by classid. */
};

struct tc_htb_qopt_offload {
        struct netlink_ext_ack *extack;
        enum tc_htb_command command;
        u16 classid;
        u32 parent_classid;
        u16 qid;
        u16 moved_qid;
        u64 rate;
        u64 ceil;
};

#define TC_HTB_CLASSID_ROOT U32_MAX

enum tc_red_command {
        TC_RED_REPLACE,
        TC_RED_DESTROY,
        TC_RED_STATS,
        TC_RED_XSTATS,
        TC_RED_GRAFT,
};

struct tc_red_qopt_offload_params {
        u32 min;
        u32 max;
        u32 probability;
        u32 limit;
        bool is_ecn;
        bool is_harddrop;
        bool is_nodrop;
        struct gnet_stats_queue *qstats;
};

struct tc_red_qopt_offload {
        enum tc_red_command command;
        u32 handle;
        u32 parent;
        union {
                struct tc_red_qopt_offload_params set;
                struct tc_qopt_offload_stats stats;
                struct red_stats *xstats;
                u32 child_handle;
        };
};

enum tc_gred_command {
        TC_GRED_REPLACE,
        TC_GRED_DESTROY,
        TC_GRED_STATS,
};

struct tc_gred_vq_qopt_offload_params {
        bool present;
        u32 limit;
        u32 prio;
        u32 min;
        u32 max;
        bool is_ecn;
        bool is_harddrop;
        u32 probability;
        /* Only need backlog, see struct tc_prio_qopt_offload_params */
        u32 *backlog;
};

struct tc_gred_qopt_offload_params {
        bool grio_on;
        bool wred_on;
        unsigned int dp_cnt;
        unsigned int dp_def;
        struct gnet_stats_queue *qstats;
        struct tc_gred_vq_qopt_offload_params tab[MAX_DPs];
};

struct tc_gred_qopt_offload_stats {
        struct gnet_stats_basic_packed bstats[MAX_DPs];
        struct gnet_stats_queue qstats[MAX_DPs];
        struct red_stats *xstats[MAX_DPs];
};

struct tc_gred_qopt_offload {
        enum tc_gred_command command;
        u32 handle;
        u32 parent;
        union {
                struct tc_gred_qopt_offload_params set;
                struct tc_gred_qopt_offload_stats stats;
        };
};

enum tc_prio_command {
        TC_PRIO_REPLACE,
        TC_PRIO_DESTROY,
        TC_PRIO_STATS,
        TC_PRIO_GRAFT,
};

struct tc_prio_qopt_offload_params {
        int bands;
        u8 priomap[TC_PRIO_MAX + 1];
        /* At the point of un-offloading the Qdisc, the reported backlog and
         * qlen need to be reduced by the portion that is in HW.
         */
        struct gnet_stats_queue *qstats;
};

struct tc_prio_qopt_offload_graft_params {
        u8 band;
        u32 child_handle;
};

struct tc_prio_qopt_offload {
        enum tc_prio_command command;
        u32 handle;
        u32 parent;
        union {
                struct tc_prio_qopt_offload_params replace_params;
                struct tc_qopt_offload_stats stats;
                struct tc_prio_qopt_offload_graft_params graft_params;
        };
};

enum tc_root_command {
        TC_ROOT_GRAFT,
};

struct tc_root_qopt_offload {
        enum tc_root_command command;
        u32 handle;
        bool ingress;
};

enum tc_ets_command {
        TC_ETS_REPLACE,
        TC_ETS_DESTROY,
        TC_ETS_STATS,
        TC_ETS_GRAFT,
};

struct tc_ets_qopt_offload_replace_params {
        unsigned int bands;
        u8 priomap[TC_PRIO_MAX + 1];
        unsigned int quanta[TCQ_ETS_MAX_BANDS]; /* 0 for strict bands. */
        unsigned int weights[TCQ_ETS_MAX_BANDS];
        struct gnet_stats_queue *qstats;
};

struct tc_ets_qopt_offload_graft_params {
        u8 band;
        u32 child_handle;
};

struct tc_ets_qopt_offload {
        enum tc_ets_command command;
        u32 handle;
        u32 parent;
        union {
                struct tc_ets_qopt_offload_replace_params replace_params;
                struct tc_qopt_offload_stats stats;
                struct tc_ets_qopt_offload_graft_params graft_params;
        };
};

enum tc_tbf_command {
        TC_TBF_REPLACE,
        TC_TBF_DESTROY,
        TC_TBF_STATS,
};

struct tc_tbf_qopt_offload_replace_params {
        struct psched_ratecfg rate;
        u32 max_size;
        struct gnet_stats_queue *qstats;
};

struct tc_tbf_qopt_offload {
        enum tc_tbf_command command;
        u32 handle;
        u32 parent;
        union {
                struct tc_tbf_qopt_offload_replace_params replace_params;
                struct tc_qopt_offload_stats stats;
        };
};

enum tc_fifo_command {
        TC_FIFO_REPLACE,
        TC_FIFO_DESTROY,
        TC_FIFO_STATS,
};

struct tc_fifo_qopt_offload {
        enum tc_fifo_command command;
        u32 handle;
        u32 parent;
        union {
                struct tc_qopt_offload_stats stats;
        };
};

#endif