update sources to ceph Nautilus 14.2.1

[ceph.git] / ceph / src / seastar / dpdk / drivers / net / mlx5 / mlx5_flow.c

/*-
 *   BSD LICENSE
 *
 *   Copyright 2016 6WIND S.A.
 *   Copyright 2016 Mellanox.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of 6WIND S.A. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/queue.h>
#include <string.h>

/* Verbs header. */
/* ISO C doesn't support unnamed structs/unions, disabling -pedantic. */
#ifdef PEDANTIC
#pragma GCC diagnostic ignored "-Wpedantic"
#endif
#include <infiniband/verbs.h>
#ifdef PEDANTIC
#pragma GCC diagnostic error "-Wpedantic"
#endif

#include <rte_ethdev.h>
#include <rte_flow.h>
#include <rte_flow_driver.h>
#include <rte_malloc.h>

#include "mlx5.h"
#include "mlx5_prm.h"

/* Number of Work Queue necessary for the DROP queue. */
#define MLX5_DROP_WQ_N 4

static int
mlx5_flow_create_eth(const struct rte_flow_item *item,
                     const void *default_mask,
                     void *data);

static int
mlx5_flow_create_vlan(const struct rte_flow_item *item,
                      const void *default_mask,
                      void *data);

static int
mlx5_flow_create_ipv4(const struct rte_flow_item *item,
                      const void *default_mask,
                      void *data);

static int
mlx5_flow_create_ipv6(const struct rte_flow_item *item,
                      const void *default_mask,
                      void *data);

static int
mlx5_flow_create_udp(const struct rte_flow_item *item,
                     const void *default_mask,
                     void *data);

static int
mlx5_flow_create_tcp(const struct rte_flow_item *item,
                     const void *default_mask,
                     void *data);

static int
mlx5_flow_create_vxlan(const struct rte_flow_item *item,
                       const void *default_mask,
                       void *data);

struct rte_flow {
        LIST_ENTRY(rte_flow) next; /**< Pointer to the next flow structure. */
        struct ibv_exp_flow_attr *ibv_attr; /**< Pointer to Verbs attributes. */
        struct ibv_exp_rwq_ind_table *ind_table; /**< Indirection table. */
        struct ibv_qp *qp; /**< Verbs queue pair. */
        struct ibv_exp_flow *ibv_flow; /**< Verbs flow. */
        struct ibv_exp_wq *wq; /**< Verbs work queue. */
        struct ibv_cq *cq; /**< Verbs completion queue. */
        uint16_t rxqs_n; /**< Number of queues in this flow, 0 if drop queue. */
        uint32_t mark:1; /**< Set if the flow is marked. */
        uint32_t drop:1; /**< Drop queue. */
        uint64_t hash_fields; /**< Fields that participate in the hash. */
        struct rxq *rxqs[]; /**< Pointer to the queues array. */
};

/** Static initializer for items. */
#define ITEMS(...) \
        (const enum rte_flow_item_type []){ \
                __VA_ARGS__, RTE_FLOW_ITEM_TYPE_END, \
        }

/** Structure to generate a simple graph of layers supported by the NIC. */
struct mlx5_flow_items {
        /** List of possible actions for these items. */
        const enum rte_flow_action_type *const actions;
        /** Bit-masks corresponding to the possibilities for the item. */
        const void *mask;
        /**
         * Default bit-masks to use when item->mask is not provided. When
         * \default_mask is also NULL, the full supported bit-mask (\mask) is
         * used instead.
         */
        const void *default_mask;
        /** Bit-masks size in bytes. */
        const unsigned int mask_sz;
        /**
         * Conversion function from rte_flow to NIC specific flow.
         *
         * @param item
         *   rte_flow item to convert.
         * @param default_mask
         *   Default bit-masks to use when item->mask is not provided.
         * @param data
         *   Internal structure to store the conversion.
         *
         * @return
         *   0 on success, negative value otherwise.
         */
        int (*convert)(const struct rte_flow_item *item,
                       const void *default_mask,
                       void *data);
        /** Size in bytes of the destination structure. */
        const unsigned int dst_sz;
        /** List of possible following items.  */
        const enum rte_flow_item_type *const items;
};

/** Valid action for this PMD. */
static const enum rte_flow_action_type valid_actions[] = {
        RTE_FLOW_ACTION_TYPE_DROP,
        RTE_FLOW_ACTION_TYPE_QUEUE,
        RTE_FLOW_ACTION_TYPE_MARK,
        RTE_FLOW_ACTION_TYPE_FLAG,
        RTE_FLOW_ACTION_TYPE_END,
};

/** Graph of supported items and associated actions. */
static const struct mlx5_flow_items mlx5_flow_items[] = {
        [RTE_FLOW_ITEM_TYPE_END] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_ETH,
                               RTE_FLOW_ITEM_TYPE_VXLAN),
        },
        [RTE_FLOW_ITEM_TYPE_ETH] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_VLAN,
                               RTE_FLOW_ITEM_TYPE_IPV4,
                               RTE_FLOW_ITEM_TYPE_IPV6),
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_eth){
                        .dst.addr_bytes = "\xff\xff\xff\xff\xff\xff",
                        .src.addr_bytes = "\xff\xff\xff\xff\xff\xff",
                        .type = -1,
                },
                .default_mask = &rte_flow_item_eth_mask,
                .mask_sz = sizeof(struct rte_flow_item_eth),
                .convert = mlx5_flow_create_eth,
                .dst_sz = sizeof(struct ibv_exp_flow_spec_eth),
        },
        [RTE_FLOW_ITEM_TYPE_VLAN] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_IPV4,
                               RTE_FLOW_ITEM_TYPE_IPV6),
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_vlan){
                        .tci = -1,
                },
                .default_mask = &rte_flow_item_vlan_mask,
                .mask_sz = sizeof(struct rte_flow_item_vlan),
                .convert = mlx5_flow_create_vlan,
                .dst_sz = 0,
        },
        [RTE_FLOW_ITEM_TYPE_IPV4] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_UDP,
                               RTE_FLOW_ITEM_TYPE_TCP),
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_ipv4){
                        .hdr = {
                                .src_addr = -1,
                                .dst_addr = -1,
                                .type_of_service = -1,
                                .next_proto_id = -1,
                        },
                },
                .default_mask = &rte_flow_item_ipv4_mask,
                .mask_sz = sizeof(struct rte_flow_item_ipv4),
                .convert = mlx5_flow_create_ipv4,
                .dst_sz = sizeof(struct ibv_exp_flow_spec_ipv4_ext),
        },
        [RTE_FLOW_ITEM_TYPE_IPV6] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_UDP,
                               RTE_FLOW_ITEM_TYPE_TCP),
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_ipv6){
                        .hdr = {
                                .src_addr = {
                                        0xff, 0xff, 0xff, 0xff,
                                        0xff, 0xff, 0xff, 0xff,
                                        0xff, 0xff, 0xff, 0xff,
                                        0xff, 0xff, 0xff, 0xff,
                                },
                                .dst_addr = {
                                        0xff, 0xff, 0xff, 0xff,
                                        0xff, 0xff, 0xff, 0xff,
                                        0xff, 0xff, 0xff, 0xff,
                                        0xff, 0xff, 0xff, 0xff,
                                },
                                .vtc_flow = -1,
                                .proto = -1,
                                .hop_limits = -1,
                        },
                },
                .default_mask = &rte_flow_item_ipv6_mask,
                .mask_sz = sizeof(struct rte_flow_item_ipv6),
                .convert = mlx5_flow_create_ipv6,
                .dst_sz = sizeof(struct ibv_exp_flow_spec_ipv6_ext),
        },
        [RTE_FLOW_ITEM_TYPE_UDP] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_VXLAN),
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_udp){
                        .hdr = {
                                .src_port = -1,
                                .dst_port = -1,
                        },
                },
                .default_mask = &rte_flow_item_udp_mask,
                .mask_sz = sizeof(struct rte_flow_item_udp),
                .convert = mlx5_flow_create_udp,
                .dst_sz = sizeof(struct ibv_exp_flow_spec_tcp_udp),
        },
        [RTE_FLOW_ITEM_TYPE_TCP] = {
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_tcp){
                        .hdr = {
                                .src_port = -1,
                                .dst_port = -1,
                        },
                },
                .default_mask = &rte_flow_item_tcp_mask,
                .mask_sz = sizeof(struct rte_flow_item_tcp),
                .convert = mlx5_flow_create_tcp,
                .dst_sz = sizeof(struct ibv_exp_flow_spec_tcp_udp),
        },
        [RTE_FLOW_ITEM_TYPE_VXLAN] = {
                .items = ITEMS(RTE_FLOW_ITEM_TYPE_ETH),
                .actions = valid_actions,
                .mask = &(const struct rte_flow_item_vxlan){
                        .vni = "\xff\xff\xff",
                },
                .default_mask = &rte_flow_item_vxlan_mask,
                .mask_sz = sizeof(struct rte_flow_item_vxlan),
                .convert = mlx5_flow_create_vxlan,
                .dst_sz = sizeof(struct ibv_exp_flow_spec_tunnel),
        },
};

/** Structure to pass to the conversion function. */
struct mlx5_flow {
        struct ibv_exp_flow_attr *ibv_attr; /**< Verbs attribute. */
        unsigned int offset; /**< Offset in bytes in the ibv_attr buffer. */
        uint32_t inner; /**< Set once VXLAN is encountered. */
        uint64_t hash_fields; /**< Fields that participate in the hash. */
};

/** Structure for Drop queue. */
struct rte_flow_drop {
        struct ibv_exp_rwq_ind_table *ind_table; /**< Indirection table. */
        struct ibv_qp *qp; /**< Verbs queue pair. */
        struct ibv_exp_wq *wqs[MLX5_DROP_WQ_N]; /**< Verbs work queue. */
        struct ibv_cq *cq; /**< Verbs completion queue. */
};

struct mlx5_flow_action {
        uint32_t queue:1; /**< Target is a receive queue. */
        uint32_t drop:1; /**< Target is a drop queue. */
        uint32_t mark:1; /**< Mark is present in the flow. */
        uint32_t mark_id; /**< Mark identifier. */
        uint16_t queues[RTE_MAX_QUEUES_PER_PORT]; /**< Queues indexes to use. */
        uint16_t queues_n; /**< Number of entries in queue[]. */
};

/**
 * Check support for a given item.
 *
 * @param item[in]
 *   Item specification.
 * @param mask[in]
 *   Bit-masks covering supported fields to compare with spec, last and mask in
 *   \item.
 * @param size
 *   Bit-Mask size in bytes.
 *
 * @return
 *   0 on success.
 */
static int
mlx5_flow_item_validate(const struct rte_flow_item *item,
                        const uint8_t *mask, unsigned int size)
{
        int ret = 0;

        if (!item->spec && (item->mask || item->last))
                return -1;
        if (item->spec && !item->mask) {
                unsigned int i;
                const uint8_t *spec = item->spec;

                for (i = 0; i < size; ++i)
                        if ((spec[i] | mask[i]) != mask[i])
                                return -1;
        }
        if (item->last && !item->mask) {
                unsigned int i;
                const uint8_t *spec = item->last;

                for (i = 0; i < size; ++i)
                        if ((spec[i] | mask[i]) != mask[i])
                                return -1;
        }
        if (item->mask) {
                unsigned int i;
                const uint8_t *spec = item->mask;

                for (i = 0; i < size; ++i)
                        if ((spec[i] | mask[i]) != mask[i])
                                return -1;
        }
        if (item->spec && item->last) {
                uint8_t spec[size];
                uint8_t last[size];
                const uint8_t *apply = mask;
                unsigned int i;

                if (item->mask)
                        apply = item->mask;
                for (i = 0; i < size; ++i) {
                        spec[i] = ((const uint8_t *)item->spec)[i] & apply[i];
                        last[i] = ((const uint8_t *)item->last)[i] & apply[i];
                }
                ret = memcmp(spec, last, size);
        }
        return ret;
}

/**
 * Validate a flow supported by the NIC.
 *
 * @param priv
 *   Pointer to private structure.
 * @param[in] attr
 *   Flow rule attributes.
 * @param[in] pattern
 *   Pattern specification (list terminated by the END pattern item).
 * @param[in] actions
 *   Associated actions (list terminated by the END action).
 * @param[out] error
 *   Perform verbose error reporting if not NULL.
 * @param[in, out] flow
 *   Flow structure to update.
 * @param[in, out] action
 *   Action structure to update.
 *
 * @return
 *   0 on success, a negative errno value otherwise and rte_errno is set.
 */
static int
priv_flow_validate(struct priv *priv,
                   const struct rte_flow_attr *attr,
                   const struct rte_flow_item items[],
                   const struct rte_flow_action actions[],
                   struct rte_flow_error *error,
                   struct mlx5_flow *flow,
                   struct mlx5_flow_action *action)
{
        const struct mlx5_flow_items *cur_item = mlx5_flow_items;

        (void)priv;
        if (attr->group) {
                rte_flow_error_set(error, ENOTSUP,
                                   RTE_FLOW_ERROR_TYPE_ATTR_GROUP,
                                   NULL,
                                   "groups are not supported");
                return -rte_errno;
        }
        if (attr->priority) {
                rte_flow_error_set(error, ENOTSUP,
                                   RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY,
                                   NULL,
                                   "priorities are not supported");
                return -rte_errno;
        }
        if (attr->egress) {
                rte_flow_error_set(error, ENOTSUP,
                                   RTE_FLOW_ERROR_TYPE_ATTR_EGRESS,
                                   NULL,
                                   "egress is not supported");
                return -rte_errno;
        }
        if (!attr->ingress) {
                rte_flow_error_set(error, ENOTSUP,
                                   RTE_FLOW_ERROR_TYPE_ATTR_INGRESS,
                                   NULL,
                                   "only ingress is supported");
                return -rte_errno;
        }
        for (; items->type != RTE_FLOW_ITEM_TYPE_END; ++items) {
                const struct mlx5_flow_items *token = NULL;
                unsigned int i;
                int err;

                if (items->type == RTE_FLOW_ITEM_TYPE_VOID)
                        continue;
                for (i = 0;
                     cur_item->items &&
                     cur_item->items[i] != RTE_FLOW_ITEM_TYPE_END;
                     ++i) {
                        if (cur_item->items[i] == items->type) {
                                token = &mlx5_flow_items[items->type];
                                break;
                        }
                }
                if (!token)
                        goto exit_item_not_supported;
                cur_item = token;
                err = mlx5_flow_item_validate(items,
                                              (const uint8_t *)cur_item->mask,
                                              cur_item->mask_sz);
                if (err)
                        goto exit_item_not_supported;
                if (flow->ibv_attr && cur_item->convert) {
                        err = cur_item->convert(items,
                                                (cur_item->default_mask ?
                                                 cur_item->default_mask :
                                                 cur_item->mask),
                                                flow);
                        if (err)
                                goto exit_item_not_supported;
                } else if (items->type == RTE_FLOW_ITEM_TYPE_VXLAN) {
                        if (flow->inner) {
                                rte_flow_error_set(error, ENOTSUP,
                                                   RTE_FLOW_ERROR_TYPE_ITEM,
                                                   items,
                                                   "cannot recognize multiple"
                                                   " VXLAN encapsulations");
                                return -rte_errno;
                        }
                        flow->inner = 1;
                }
                flow->offset += cur_item->dst_sz;
        }
        for (; actions->type != RTE_FLOW_ACTION_TYPE_END; ++actions) {
                if (actions->type == RTE_FLOW_ACTION_TYPE_VOID) {
                        continue;
                } else if (actions->type == RTE_FLOW_ACTION_TYPE_DROP) {
                        action->drop = 1;
                } else if (actions->type == RTE_FLOW_ACTION_TYPE_QUEUE) {
                        const struct rte_flow_action_queue *queue =
                                (const struct rte_flow_action_queue *)
                                actions->conf;
                        uint16_t n;
                        uint16_t found = 0;

                        if (!queue || (queue->index > (priv->rxqs_n - 1)))
                                goto exit_action_not_supported;
                        for (n = 0; n < action->queues_n; ++n) {
                                if (action->queues[n] == queue->index) {
                                        found = 1;
                                        break;
                                }
                        }
                        if (action->queues_n > 1 && !found) {
                                rte_flow_error_set(error, ENOTSUP,
                                           RTE_FLOW_ERROR_TYPE_ACTION,
                                           actions,
                                           "queue action not in RSS queues");
                                return -rte_errno;
                        }
                        if (!found) {
                                action->queue = 1;
                                action->queues_n = 1;
                                action->queues[0] = queue->index;
                        }
                } else if (actions->type == RTE_FLOW_ACTION_TYPE_RSS) {
                        const struct rte_flow_action_rss *rss =
                                (const struct rte_flow_action_rss *)
                                actions->conf;
                        uint16_t n;

                        if (!rss || !rss->num) {
                                rte_flow_error_set(error, EINVAL,
                                                   RTE_FLOW_ERROR_TYPE_ACTION,
                                                   actions,
                                                   "no valid queues");
                                return -rte_errno;
                        }
                        if (action->queues_n == 1) {
                                uint16_t found = 0;

                                assert(action->queues_n);
                                for (n = 0; n < rss->num; ++n) {
                                        if (action->queues[0] ==
                                            rss->queue[n]) {
                                                found = 1;
                                                break;
                                        }
                                }
                                if (!found) {
                                        rte_flow_error_set(error, ENOTSUP,
                                                   RTE_FLOW_ERROR_TYPE_ACTION,
                                                   actions,
                                                   "queue action not in RSS"
                                                   " queues");
                                        return -rte_errno;
                                }
                        }
                        for (n = 0; n < rss->num; ++n) {
                                if (rss->queue[n] >= priv->rxqs_n) {
                                        rte_flow_error_set(error, EINVAL,
                                                   RTE_FLOW_ERROR_TYPE_ACTION,
                                                   actions,
                                                   "queue id > number of"
                                                   " queues");
                                        return -rte_errno;
                                }
                        }
                        action->queue = 1;
                        for (n = 0; n < rss->num; ++n)
                                action->queues[n] = rss->queue[n];
                        action->queues_n = rss->num;
                } else if (actions->type == RTE_FLOW_ACTION_TYPE_MARK) {
                        const struct rte_flow_action_mark *mark =
                                (const struct rte_flow_action_mark *)
                                actions->conf;

                        if (!mark) {
                                rte_flow_error_set(error, EINVAL,
                                                   RTE_FLOW_ERROR_TYPE_ACTION,
                                                   actions,
                                                   "mark must be defined");
                                return -rte_errno;
                        } else if (mark->id >= MLX5_FLOW_MARK_MAX) {
                                rte_flow_error_set(error, ENOTSUP,
                                                   RTE_FLOW_ERROR_TYPE_ACTION,
                                                   actions,
                                                   "mark must be between 0"
                                                   " and 16777199");
                                return -rte_errno;
                        }
                        action->mark = 1;
                        action->mark_id = mark->id;
                } else if (actions->type == RTE_FLOW_ACTION_TYPE_FLAG) {
                        action->mark = 1;
                } else {
                        goto exit_action_not_supported;
                }
        }
        if (action->mark && !flow->ibv_attr && !action->drop)
                flow->offset += sizeof(struct ibv_exp_flow_spec_action_tag);
        if (!action->queue && !action->drop) {
                rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "no valid action");
                return -rte_errno;
        }
        return 0;
exit_item_not_supported:
        rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ITEM,
                           items, "item not supported");
        return -rte_errno;
exit_action_not_supported:
        rte_flow_error_set(error, ENOTSUP, RTE_FLOW_ERROR_TYPE_ACTION,
                           actions, "action not supported");
        return -rte_errno;
}

/**
 * Validate a flow supported by the NIC.
 *
 * @see rte_flow_validate()
 * @see rte_flow_ops
 */
int
mlx5_flow_validate(struct rte_eth_dev *dev,
                   const struct rte_flow_attr *attr,
                   const struct rte_flow_item items[],
                   const struct rte_flow_action actions[],
                   struct rte_flow_error *error)
{
        struct priv *priv = dev->data->dev_private;
        int ret;
        struct mlx5_flow flow = { .offset = sizeof(struct ibv_exp_flow_attr) };
        struct mlx5_flow_action action = {
                .queue = 0,
                .drop = 0,
                .mark = 0,
                .mark_id = MLX5_FLOW_MARK_DEFAULT,
                .queues_n = 0,
        };

        priv_lock(priv);
        ret = priv_flow_validate(priv, attr, items, actions, error, &flow,
                                 &action);
        priv_unlock(priv);
        return ret;
}

/**
 * Convert Ethernet item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_eth(const struct rte_flow_item *item,
                     const void *default_mask,
                     void *data)
{
        const struct rte_flow_item_eth *spec = item->spec;
        const struct rte_flow_item_eth *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_eth *eth;
        const unsigned int eth_size = sizeof(struct ibv_exp_flow_spec_eth);
        unsigned int i;

        ++flow->ibv_attr->num_of_specs;
        flow->ibv_attr->priority = 2;
        flow->hash_fields = 0;
        eth = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *eth = (struct ibv_exp_flow_spec_eth) {
                .type = flow->inner | IBV_EXP_FLOW_SPEC_ETH,
                .size = eth_size,
        };
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        memcpy(eth->val.dst_mac, spec->dst.addr_bytes, ETHER_ADDR_LEN);
        memcpy(eth->val.src_mac, spec->src.addr_bytes, ETHER_ADDR_LEN);
        eth->val.ether_type = spec->type;
        memcpy(eth->mask.dst_mac, mask->dst.addr_bytes, ETHER_ADDR_LEN);
        memcpy(eth->mask.src_mac, mask->src.addr_bytes, ETHER_ADDR_LEN);
        eth->mask.ether_type = mask->type;
        /* Remove unwanted bits from values. */
        for (i = 0; i < ETHER_ADDR_LEN; ++i) {
                eth->val.dst_mac[i] &= eth->mask.dst_mac[i];
                eth->val.src_mac[i] &= eth->mask.src_mac[i];
        }
        eth->val.ether_type &= eth->mask.ether_type;
        return 0;
}

/**
 * Convert VLAN item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_vlan(const struct rte_flow_item *item,
                      const void *default_mask,
                      void *data)
{
        const struct rte_flow_item_vlan *spec = item->spec;
        const struct rte_flow_item_vlan *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_eth *eth;
        const unsigned int eth_size = sizeof(struct ibv_exp_flow_spec_eth);

        eth = (void *)((uintptr_t)flow->ibv_attr + flow->offset - eth_size);
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        eth->val.vlan_tag = spec->tci;
        eth->mask.vlan_tag = mask->tci;
        eth->val.vlan_tag &= eth->mask.vlan_tag;
        return 0;
}

/**
 * Convert IPv4 item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_ipv4(const struct rte_flow_item *item,
                      const void *default_mask,
                      void *data)
{
        const struct rte_flow_item_ipv4 *spec = item->spec;
        const struct rte_flow_item_ipv4 *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_ipv4_ext *ipv4;
        unsigned int ipv4_size = sizeof(struct ibv_exp_flow_spec_ipv4_ext);

        ++flow->ibv_attr->num_of_specs;
        flow->ibv_attr->priority = 1;
        flow->hash_fields = (IBV_EXP_RX_HASH_SRC_IPV4 |
                             IBV_EXP_RX_HASH_DST_IPV4);
        ipv4 = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *ipv4 = (struct ibv_exp_flow_spec_ipv4_ext) {
                .type = flow->inner | IBV_EXP_FLOW_SPEC_IPV4_EXT,
                .size = ipv4_size,
        };
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        ipv4->val = (struct ibv_exp_flow_ipv4_ext_filter){
                .src_ip = spec->hdr.src_addr,
                .dst_ip = spec->hdr.dst_addr,
                .proto = spec->hdr.next_proto_id,
                .tos = spec->hdr.type_of_service,
        };
        ipv4->mask = (struct ibv_exp_flow_ipv4_ext_filter){
                .src_ip = mask->hdr.src_addr,
                .dst_ip = mask->hdr.dst_addr,
                .proto = mask->hdr.next_proto_id,
                .tos = mask->hdr.type_of_service,
        };
        /* Remove unwanted bits from values. */
        ipv4->val.src_ip &= ipv4->mask.src_ip;
        ipv4->val.dst_ip &= ipv4->mask.dst_ip;
        ipv4->val.proto &= ipv4->mask.proto;
        ipv4->val.tos &= ipv4->mask.tos;
        return 0;
}

/**
 * Convert IPv6 item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_ipv6(const struct rte_flow_item *item,
                      const void *default_mask,
                      void *data)
{
        const struct rte_flow_item_ipv6 *spec = item->spec;
        const struct rte_flow_item_ipv6 *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_ipv6_ext *ipv6;
        unsigned int ipv6_size = sizeof(struct ibv_exp_flow_spec_ipv6_ext);
        unsigned int i;

        ++flow->ibv_attr->num_of_specs;
        flow->ibv_attr->priority = 1;
        flow->hash_fields = (IBV_EXP_RX_HASH_SRC_IPV6 |
                             IBV_EXP_RX_HASH_DST_IPV6);
        ipv6 = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *ipv6 = (struct ibv_exp_flow_spec_ipv6_ext) {
                .type = flow->inner | IBV_EXP_FLOW_SPEC_IPV6_EXT,
                .size = ipv6_size,
        };
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        memcpy(ipv6->val.src_ip, spec->hdr.src_addr,
               RTE_DIM(ipv6->val.src_ip));
        memcpy(ipv6->val.dst_ip, spec->hdr.dst_addr,
               RTE_DIM(ipv6->val.dst_ip));
        memcpy(ipv6->mask.src_ip, mask->hdr.src_addr,
               RTE_DIM(ipv6->mask.src_ip));
        memcpy(ipv6->mask.dst_ip, mask->hdr.dst_addr,
               RTE_DIM(ipv6->mask.dst_ip));
        ipv6->mask.flow_label = mask->hdr.vtc_flow;
        ipv6->mask.next_hdr = mask->hdr.proto;
        ipv6->mask.hop_limit = mask->hdr.hop_limits;
        /* Remove unwanted bits from values. */
        for (i = 0; i < RTE_DIM(ipv6->val.src_ip); ++i) {
                ipv6->val.src_ip[i] &= ipv6->mask.src_ip[i];
                ipv6->val.dst_ip[i] &= ipv6->mask.dst_ip[i];
        }
        ipv6->val.flow_label &= ipv6->mask.flow_label;
        ipv6->val.next_hdr &= ipv6->mask.next_hdr;
        ipv6->val.hop_limit &= ipv6->mask.hop_limit;
        return 0;
}

/**
 * Convert UDP item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_udp(const struct rte_flow_item *item,
                     const void *default_mask,
                     void *data)
{
        const struct rte_flow_item_udp *spec = item->spec;
        const struct rte_flow_item_udp *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_tcp_udp *udp;
        unsigned int udp_size = sizeof(struct ibv_exp_flow_spec_tcp_udp);

        ++flow->ibv_attr->num_of_specs;
        flow->ibv_attr->priority = 0;
        flow->hash_fields |= (IBV_EXP_RX_HASH_SRC_PORT_UDP |
                              IBV_EXP_RX_HASH_DST_PORT_UDP);
        udp = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *udp = (struct ibv_exp_flow_spec_tcp_udp) {
                .type = flow->inner | IBV_EXP_FLOW_SPEC_UDP,
                .size = udp_size,
        };
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        udp->val.dst_port = spec->hdr.dst_port;
        udp->val.src_port = spec->hdr.src_port;
        udp->mask.dst_port = mask->hdr.dst_port;
        udp->mask.src_port = mask->hdr.src_port;
        /* Remove unwanted bits from values. */
        udp->val.src_port &= udp->mask.src_port;
        udp->val.dst_port &= udp->mask.dst_port;
        return 0;
}

/**
 * Convert TCP item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_tcp(const struct rte_flow_item *item,
                     const void *default_mask,
                     void *data)
{
        const struct rte_flow_item_tcp *spec = item->spec;
        const struct rte_flow_item_tcp *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_tcp_udp *tcp;
        unsigned int tcp_size = sizeof(struct ibv_exp_flow_spec_tcp_udp);

        ++flow->ibv_attr->num_of_specs;
        flow->ibv_attr->priority = 0;
        flow->hash_fields |= (IBV_EXP_RX_HASH_SRC_PORT_TCP |
                              IBV_EXP_RX_HASH_DST_PORT_TCP);
        tcp = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *tcp = (struct ibv_exp_flow_spec_tcp_udp) {
                .type = flow->inner | IBV_EXP_FLOW_SPEC_TCP,
                .size = tcp_size,
        };
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        tcp->val.dst_port = spec->hdr.dst_port;
        tcp->val.src_port = spec->hdr.src_port;
        tcp->mask.dst_port = mask->hdr.dst_port;
        tcp->mask.src_port = mask->hdr.src_port;
        /* Remove unwanted bits from values. */
        tcp->val.src_port &= tcp->mask.src_port;
        tcp->val.dst_port &= tcp->mask.dst_port;
        return 0;
}

/**
 * Convert VXLAN item to Verbs specification.
 *
 * @param item[in]
 *   Item specification.
 * @param default_mask[in]
 *   Default bit-masks to use when item->mask is not provided.
 * @param data[in, out]
 *   User structure.
 */
static int
mlx5_flow_create_vxlan(const struct rte_flow_item *item,
                       const void *default_mask,
                       void *data)
{
        const struct rte_flow_item_vxlan *spec = item->spec;
        const struct rte_flow_item_vxlan *mask = item->mask;
        struct mlx5_flow *flow = (struct mlx5_flow *)data;
        struct ibv_exp_flow_spec_tunnel *vxlan;
        unsigned int size = sizeof(struct ibv_exp_flow_spec_tunnel);
        union vni {
                uint32_t vlan_id;
                uint8_t vni[4];
        } id;

        ++flow->ibv_attr->num_of_specs;
        flow->ibv_attr->priority = 0;
        id.vni[0] = 0;
        vxlan = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *vxlan = (struct ibv_exp_flow_spec_tunnel) {
                .type = flow->inner | IBV_EXP_FLOW_SPEC_VXLAN_TUNNEL,
                .size = size,
        };
        flow->inner = IBV_EXP_FLOW_SPEC_INNER;
        if (!spec)
                return 0;
        if (!mask)
                mask = default_mask;
        memcpy(&id.vni[1], spec->vni, 3);
        vxlan->val.tunnel_id = id.vlan_id;
        memcpy(&id.vni[1], mask->vni, 3);
        vxlan->mask.tunnel_id = id.vlan_id;
        /* Remove unwanted bits from values. */
        vxlan->val.tunnel_id &= vxlan->mask.tunnel_id;
        return 0;
}

/**
 * Convert mark/flag action to Verbs specification.
 *
 * @param flow
 *   Pointer to MLX5 flow structure.
 * @param mark_id
 *   Mark identifier.
 */
static int
mlx5_flow_create_flag_mark(struct mlx5_flow *flow, uint32_t mark_id)
{
        struct ibv_exp_flow_spec_action_tag *tag;
        unsigned int size = sizeof(struct ibv_exp_flow_spec_action_tag);

        tag = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
        *tag = (struct ibv_exp_flow_spec_action_tag){
                .type = IBV_EXP_FLOW_SPEC_ACTION_TAG,
                .size = size,
                .tag_id = mlx5_flow_mark_set(mark_id),
        };
        ++flow->ibv_attr->num_of_specs;
        return 0;
}

/**
 * Complete flow rule creation with a drop queue.
 *
 * @param priv
 *   Pointer to private structure.
 * @param flow
 *   MLX5 flow attributes (filled by mlx5_flow_validate()).
 * @param[out] error
 *   Perform verbose error reporting if not NULL.
 *
 * @return
 *   A flow if the rule could be created.
 */
static struct rte_flow *
priv_flow_create_action_queue_drop(struct priv *priv,
                                   struct mlx5_flow *flow,
                                   struct rte_flow_error *error)
{
        struct rte_flow *rte_flow;

        assert(priv->pd);
        assert(priv->ctx);
        rte_flow = rte_calloc(__func__, 1, sizeof(*rte_flow), 0);
        if (!rte_flow) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "cannot allocate flow memory");
                return NULL;
        }
        rte_flow->drop = 1;
        rte_flow->ibv_attr = flow->ibv_attr;
        rte_flow->qp = priv->flow_drop_queue->qp;
        if (!priv->started)
                return rte_flow;
        rte_flow->ibv_flow = ibv_exp_create_flow(rte_flow->qp,
                                                 rte_flow->ibv_attr);
        if (!rte_flow->ibv_flow) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "flow rule creation failure");
                goto error;
        }
        return rte_flow;
error:
        assert(rte_flow);
        rte_free(rte_flow);
        return NULL;
}

/**
 * Complete flow rule creation.
 *
 * @param priv
 *   Pointer to private structure.
 * @param flow
 *   MLX5 flow attributes (filled by mlx5_flow_validate()).
 * @param action
 *   Target action structure.
 * @param[out] error
 *   Perform verbose error reporting if not NULL.
 *
 * @return
 *   A flow if the rule could be created.
 */
static struct rte_flow *
priv_flow_create_action_queue(struct priv *priv,
                              struct mlx5_flow *flow,
                              struct mlx5_flow_action *action,
                              struct rte_flow_error *error)
{
        struct rte_flow *rte_flow;
        unsigned int i;
        unsigned int j;
        const unsigned int wqs_n = 1 << log2above(action->queues_n);
        struct ibv_exp_wq *wqs[wqs_n];

        assert(priv->pd);
        assert(priv->ctx);
        assert(!action->drop);
        rte_flow = rte_calloc(__func__, 1, sizeof(*rte_flow) +
                              sizeof(*rte_flow->rxqs) * action->queues_n, 0);
        if (!rte_flow) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "cannot allocate flow memory");
                return NULL;
        }
        for (i = 0; i < action->queues_n; ++i) {
                struct rxq_ctrl *rxq;

                rxq = container_of((*priv->rxqs)[action->queues[i]],
                                   struct rxq_ctrl, rxq);
                wqs[i] = rxq->wq;
                rte_flow->rxqs[i] = &rxq->rxq;
                ++rte_flow->rxqs_n;
                rxq->rxq.mark |= action->mark;
        }
        /* finalise indirection table. */
        for (j = 0; i < wqs_n; ++i, ++j) {
                wqs[i] = wqs[j];
                if (j == action->queues_n)
                        j = 0;
        }
        rte_flow->mark = action->mark;
        rte_flow->ibv_attr = flow->ibv_attr;
        rte_flow->hash_fields = flow->hash_fields;
        rte_flow->ind_table = ibv_exp_create_rwq_ind_table(
                priv->ctx,
                &(struct ibv_exp_rwq_ind_table_init_attr){
                        .pd = priv->pd,
                        .log_ind_tbl_size = log2above(action->queues_n),
                        .ind_tbl = wqs,
                        .comp_mask = 0,
                });
        if (!rte_flow->ind_table) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "cannot allocate indirection table");
                goto error;
        }
        rte_flow->qp = ibv_exp_create_qp(
                priv->ctx,
                &(struct ibv_exp_qp_init_attr){
                        .qp_type = IBV_QPT_RAW_PACKET,
                        .comp_mask =
                                IBV_EXP_QP_INIT_ATTR_PD |
                                IBV_EXP_QP_INIT_ATTR_PORT |
                                IBV_EXP_QP_INIT_ATTR_RX_HASH,
                        .pd = priv->pd,
                        .rx_hash_conf = &(struct ibv_exp_rx_hash_conf){
                                .rx_hash_function =
                                        IBV_EXP_RX_HASH_FUNC_TOEPLITZ,
                                .rx_hash_key_len = rss_hash_default_key_len,
                                .rx_hash_key = rss_hash_default_key,
                                .rx_hash_fields_mask = rte_flow->hash_fields,
                                .rwq_ind_tbl = rte_flow->ind_table,
                        },
                        .port_num = priv->port,
                });
        if (!rte_flow->qp) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "cannot allocate QP");
                goto error;
        }
        if (!priv->started)
                return rte_flow;
        rte_flow->ibv_flow = ibv_exp_create_flow(rte_flow->qp,
                                                 rte_flow->ibv_attr);
        if (!rte_flow->ibv_flow) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "flow rule creation failure");
                goto error;
        }
        return rte_flow;
error:
        assert(rte_flow);
        if (rte_flow->qp)
                ibv_destroy_qp(rte_flow->qp);
        if (rte_flow->ind_table)
                ibv_exp_destroy_rwq_ind_table(rte_flow->ind_table);
        rte_free(rte_flow);
        return NULL;
}

/**
 * Convert a flow.
 *
 * @param priv
 *   Pointer to private structure.
 * @param[in] attr
 *   Flow rule attributes.
 * @param[in] pattern
 *   Pattern specification (list terminated by the END pattern item).
 * @param[in] actions
 *   Associated actions (list terminated by the END action).
 * @param[out] error
 *   Perform verbose error reporting if not NULL.
 *
 * @return
 *   A flow on success, NULL otherwise.
 */
static struct rte_flow *
priv_flow_create(struct priv *priv,
                 const struct rte_flow_attr *attr,
                 const struct rte_flow_item items[],
                 const struct rte_flow_action actions[],
                 struct rte_flow_error *error)
{
        struct rte_flow *rte_flow;
        struct mlx5_flow flow = { .offset = sizeof(struct ibv_exp_flow_attr), };
        struct mlx5_flow_action action = {
                .queue = 0,
                .drop = 0,
                .mark = 0,
                .mark_id = MLX5_FLOW_MARK_DEFAULT,
                .queues_n = 0,
        };
        int err;

        err = priv_flow_validate(priv, attr, items, actions, error, &flow,
                                 &action);
        if (err)
                goto exit;
        flow.ibv_attr = rte_malloc(__func__, flow.offset, 0);
        flow.offset = sizeof(struct ibv_exp_flow_attr);
        if (!flow.ibv_attr) {
                rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
                                   NULL, "cannot allocate ibv_attr memory");
                goto exit;
        }
        *flow.ibv_attr = (struct ibv_exp_flow_attr){
                .type = IBV_EXP_FLOW_ATTR_NORMAL,
                .size = sizeof(struct ibv_exp_flow_attr),
                .priority = attr->priority,
                .num_of_specs = 0,
                .port = 0,
                .flags = 0,
                .reserved = 0,
        };
        flow.inner = 0;
        flow.hash_fields = 0;
        claim_zero(priv_flow_validate(priv, attr, items, actions,
                                      error, &flow, &action));
        if (action.mark && !action.drop) {
                mlx5_flow_create_flag_mark(&flow, action.mark_id);
                flow.offset += sizeof(struct ibv_exp_flow_spec_action_tag);
        }
        if (action.drop)
                rte_flow =
                        priv_flow_create_action_queue_drop(priv, &flow, error);
        else
                rte_flow = priv_flow_create_action_queue(priv, &flow, &action,
                                                         error);
        if (!rte_flow)
                goto exit;
        return rte_flow;
exit:
        rte_free(flow.ibv_attr);
        return NULL;
}

/**
 * Create a flow.
 *
 * @see rte_flow_create()
 * @see rte_flow_ops
 */
struct rte_flow *
mlx5_flow_create(struct rte_eth_dev *dev,
                 const struct rte_flow_attr *attr,
                 const struct rte_flow_item items[],
                 const struct rte_flow_action actions[],
                 struct rte_flow_error *error)
{
        struct priv *priv = dev->data->dev_private;
        struct rte_flow *flow;

        priv_lock(priv);
        flow = priv_flow_create(priv, attr, items, actions, error);
        if (flow) {
                LIST_INSERT_HEAD(&priv->flows, flow, next);
                DEBUG("Flow created %p", (void *)flow);
        }
        priv_unlock(priv);
        return flow;
}

/**
 * Destroy a flow.
 *
 * @param priv
 *   Pointer to private structure.
 * @param[in] flow
 *   Flow to destroy.
 */
static void
priv_flow_destroy(struct priv *priv,
                  struct rte_flow *flow)
{
        (void)priv;
        LIST_REMOVE(flow, next);
        if (flow->ibv_flow)
                claim_zero(ibv_exp_destroy_flow(flow->ibv_flow));
        if (flow->drop)
                goto free;
        if (flow->qp)
                claim_zero(ibv_destroy_qp(flow->qp));
        if (flow->ind_table)
                claim_zero(ibv_exp_destroy_rwq_ind_table(flow->ind_table));
        if (flow->drop && flow->wq)
                claim_zero(ibv_exp_destroy_wq(flow->wq));
        if (flow->drop && flow->cq)
                claim_zero(ibv_destroy_cq(flow->cq));
        if (flow->mark) {
                struct rte_flow *tmp;
                struct rxq *rxq;
                uint32_t mark_n = 0;
                uint32_t queue_n;

                /*
                 * To remove the mark from the queue, the queue must not be
                 * present in any other marked flow (RSS or not).
                 */
                for (queue_n = 0; queue_n < flow->rxqs_n; ++queue_n) {
                        rxq = flow->rxqs[queue_n];
                        for (tmp = LIST_FIRST(&priv->flows);
                             tmp;
                             tmp = LIST_NEXT(tmp, next)) {
                                uint32_t tqueue_n;

                                if (tmp->drop)
                                        continue;
                                for (tqueue_n = 0;
                                     tqueue_n < tmp->rxqs_n;
                                     ++tqueue_n) {
                                        struct rxq *trxq;

                                        trxq = tmp->rxqs[tqueue_n];
                                        if (rxq == trxq)
                                                ++mark_n;
                                }
                        }
                        rxq->mark = !!mark_n;
                }
        }
free:
        rte_free(flow->ibv_attr);
        DEBUG("Flow destroyed %p", (void *)flow);
        rte_free(flow);
}

/**
 * Destroy a flow.
 *
 * @see rte_flow_destroy()
 * @see rte_flow_ops
 */
int
mlx5_flow_destroy(struct rte_eth_dev *dev,
                  struct rte_flow *flow,
                  struct rte_flow_error *error)
{
        struct priv *priv = dev->data->dev_private;

        (void)error;
        priv_lock(priv);
        priv_flow_destroy(priv, flow);
        priv_unlock(priv);
        return 0;
}

/**
 * Destroy all flows.
 *
 * @param priv
 *   Pointer to private structure.
 */
static void
priv_flow_flush(struct priv *priv)
{
        while (!LIST_EMPTY(&priv->flows)) {
                struct rte_flow *flow;

                flow = LIST_FIRST(&priv->flows);
                priv_flow_destroy(priv, flow);
        }
}

/**
 * Destroy all flows.
 *
 * @see rte_flow_flush()
 * @see rte_flow_ops
 */
int
mlx5_flow_flush(struct rte_eth_dev *dev,
                struct rte_flow_error *error)
{
        struct priv *priv = dev->data->dev_private;

        (void)error;
        priv_lock(priv);
        priv_flow_flush(priv);
        priv_unlock(priv);
        return 0;
}

/**
 * Create drop queue.
 *
 * @param priv
 *   Pointer to private structure.
 *
 * @return
 *   0 on success.
 */
static int
priv_flow_create_drop_queue(struct priv *priv)
{
        struct rte_flow_drop *fdq = NULL;
        unsigned int i;

        assert(priv->pd);
        assert(priv->ctx);
        fdq = rte_calloc(__func__, 1, sizeof(*fdq), 0);
        if (!fdq) {
                WARN("cannot allocate memory for drop queue");
                goto error;
        }
        fdq->cq = ibv_exp_create_cq(priv->ctx, 1, NULL, NULL, 0,
                        &(struct ibv_exp_cq_init_attr){
                        .comp_mask = 0,
                        });
        if (!fdq->cq) {
                WARN("cannot allocate CQ for drop queue");
                goto error;
        }
        for (i = 0; i != MLX5_DROP_WQ_N; ++i) {
                fdq->wqs[i] = ibv_exp_create_wq(priv->ctx,
                                &(struct ibv_exp_wq_init_attr){
                                .wq_type = IBV_EXP_WQT_RQ,
                                .max_recv_wr = 1,
                                .max_recv_sge = 1,
                                .pd = priv->pd,
                                .cq = fdq->cq,
                                });
                if (!fdq->wqs[i]) {
                        WARN("cannot allocate WQ for drop queue");
                        goto error;
                }
        }
        fdq->ind_table = ibv_exp_create_rwq_ind_table(priv->ctx,
                        &(struct ibv_exp_rwq_ind_table_init_attr){
                        .pd = priv->pd,
                        .log_ind_tbl_size = 0,
                        .ind_tbl = fdq->wqs,
                        .comp_mask = 0,
                        });
        if (!fdq->ind_table) {
                WARN("cannot allocate indirection table for drop queue");
                goto error;
        }
        fdq->qp = ibv_exp_create_qp(priv->ctx,
                &(struct ibv_exp_qp_init_attr){
                        .qp_type = IBV_QPT_RAW_PACKET,
                        .comp_mask =
                                IBV_EXP_QP_INIT_ATTR_PD |
                                IBV_EXP_QP_INIT_ATTR_PORT |
                                IBV_EXP_QP_INIT_ATTR_RX_HASH,
                        .pd = priv->pd,
                        .rx_hash_conf = &(struct ibv_exp_rx_hash_conf){
                                .rx_hash_function =
                                        IBV_EXP_RX_HASH_FUNC_TOEPLITZ,
                                .rx_hash_key_len = rss_hash_default_key_len,
                                .rx_hash_key = rss_hash_default_key,
                                .rx_hash_fields_mask = 0,
                                .rwq_ind_tbl = fdq->ind_table,
                                },
                        .port_num = priv->port,
                        });
        if (!fdq->qp) {
                WARN("cannot allocate QP for drop queue");
                goto error;
        }
        priv->flow_drop_queue = fdq;
        return 0;
error:
        if (fdq->qp)
                claim_zero(ibv_destroy_qp(fdq->qp));
        if (fdq->ind_table)
                claim_zero(ibv_exp_destroy_rwq_ind_table(fdq->ind_table));
        for (i = 0; i != MLX5_DROP_WQ_N; ++i) {
                if (fdq->wqs[i])
                        claim_zero(ibv_exp_destroy_wq(fdq->wqs[i]));
        }
        if (fdq->cq)
                claim_zero(ibv_destroy_cq(fdq->cq));
        if (fdq)
                rte_free(fdq);
        priv->flow_drop_queue = NULL;
        return -1;
}

/**
 * Delete drop queue.
 *
 * @param priv
 *   Pointer to private structure.
 */
static void
priv_flow_delete_drop_queue(struct priv *priv)
{
        struct rte_flow_drop *fdq = priv->flow_drop_queue;
        unsigned int i;

        if (!fdq)
                return;
        if (fdq->qp)
                claim_zero(ibv_destroy_qp(fdq->qp));
        if (fdq->ind_table)
                claim_zero(ibv_exp_destroy_rwq_ind_table(fdq->ind_table));
        for (i = 0; i != MLX5_DROP_WQ_N; ++i) {
                if (fdq->wqs[i])
                        claim_zero(ibv_exp_destroy_wq(fdq->wqs[i]));
        }
        if (fdq->cq)
                claim_zero(ibv_destroy_cq(fdq->cq));
        rte_free(fdq);
        priv->flow_drop_queue = NULL;
}

/**
 * Remove all flows.
 *
 * Called by dev_stop() to remove all flows.
 *
 * @param priv
 *   Pointer to private structure.
 */
void
priv_flow_stop(struct priv *priv)
{
        struct rte_flow *flow;

        for (flow = LIST_FIRST(&priv->flows);
             flow;
             flow = LIST_NEXT(flow, next)) {
                claim_zero(ibv_exp_destroy_flow(flow->ibv_flow));
                flow->ibv_flow = NULL;
                if (flow->mark) {
                        unsigned int n;

                        for (n = 0; n < flow->rxqs_n; ++n)
                                flow->rxqs[n]->mark = 0;
                }
                DEBUG("Flow %p removed", (void *)flow);
        }
        priv_flow_delete_drop_queue(priv);
}

/**
 * Add all flows.
 *
 * @param priv
 *   Pointer to private structure.
 *
 * @return
 *   0 on success, a errno value otherwise and rte_errno is set.
 */
int
priv_flow_start(struct priv *priv)
{
        int ret;
        struct rte_flow *flow;

        ret = priv_flow_create_drop_queue(priv);
        if (ret)
                return -1;
        for (flow = LIST_FIRST(&priv->flows);
             flow;
             flow = LIST_NEXT(flow, next)) {
                struct ibv_qp *qp;

                if (flow->drop)
                        qp = priv->flow_drop_queue->qp;
                else
                        qp = flow->qp;
                flow->ibv_flow = ibv_exp_create_flow(qp, flow->ibv_attr);
                if (!flow->ibv_flow) {
                        DEBUG("Flow %p cannot be applied", (void *)flow);
                        rte_errno = EINVAL;
                        return rte_errno;
                }
                DEBUG("Flow %p applied", (void *)flow);
                if (flow->mark) {
                        unsigned int n;

                        for (n = 0; n < flow->rxqs_n; ++n)
                                flow->rxqs[n]->mark = 1;
                }
        }
        return 0;
}

/**
 * Verify if the Rx queue is used in a flow.
 *
 * @param priv
 *   Pointer to private structure.
 * @param rxq
 *   Pointer to the queue to search.
 *
 * @return
 *   Nonzero if the queue is used by a flow.
 */
int
priv_flow_rxq_in_use(struct priv *priv, struct rxq *rxq)
{
        struct rte_flow *flow;

        for (flow = LIST_FIRST(&priv->flows);
             flow;
             flow = LIST_NEXT(flow, next)) {
                unsigned int n;

                if (flow->drop)
                        continue;
                for (n = 0; n < flow->rxqs_n; ++n) {
                        if (flow->rxqs[n] == rxq)
                                return 1;
                }
        }
        return 0;
}