[dpdk-dev] [PATCH 2/2] net/mlx4: support basic flow items and actions

[Vasily Philipov <vasilyf@mellanox.com>]

Adding support for the next items: eth, vlan, ipv4, udp, tcp and for the
next actions: queue, drop

Signed-off-by: Vasily Philipov <vasilyf@mellanox.com>
---
 drivers/net/mlx4/Makefile    |    3 +-
 drivers/net/mlx4/mlx4.c      |   60 ++-
 drivers/net/mlx4/mlx4.h      |    3 +
 drivers/net/mlx4/mlx4_flow.c | 1053 ++++++++++++++++++++++++++++++++++++++++++
 drivers/net/mlx4/mlx4_flow.h |  104 +++++
 5 files changed, 1220 insertions(+), 3 deletions(-)
 create mode 100644 drivers/net/mlx4/mlx4_flow.c
 create mode 100644 drivers/net/mlx4/mlx4_flow.h

diff --git a/drivers/net/mlx4/Makefile b/drivers/net/mlx4/Makefile
index 68c5902..1d463f7 100644
--- a/drivers/net/mlx4/Makefile
+++ b/drivers/net/mlx4/Makefile
@@ -36,6 +36,7 @@ LIB = librte_pmd_mlx4.a
 
 # Sources.
 SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4.c
+SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += mlx4_flow.c
 
 # Dependencies.
 DEPDIRS-$(CONFIG_RTE_LIBRTE_MLX4_PMD) += lib/librte_ether
@@ -129,7 +130,7 @@ mlx4_autoconf.h: mlx4_autoconf.h.new
 		cmp '$<' '$@' $(AUTOCONF_OUTPUT) || \
 		mv '$<' '$@'
 
-mlx4.o: mlx4_autoconf.h
+$(SRCS-$(CONFIG_RTE_LIBRTE_MLX4_PMD):.c=.o): mlx4_autoconf.h
 
 clean_mlx4: FORCE
 	$Q rm -f -- mlx4_autoconf.h mlx4_autoconf.h.new
diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 82ccac8..cc2ebfa 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -82,12 +82,14 @@
 #include <rte_log.h>
 #include <rte_alarm.h>
 #include <rte_memory.h>
+#include <rte_flow.h>
 
 /* Generated configuration header. */
 #include "mlx4_autoconf.h"
 
-/* PMD header. */
+/* PMD headers. */
 #include "mlx4.h"
+#include "mlx4_flow.h"
 
 /* Convenience macros for accessing mbuf fields. */
 #define NEXT(m) ((m)->next)
@@ -2351,6 +2353,7 @@ struct txq_mp2mr_mbuf_check_data {
 	assert(((uint8_t *)attr + sizeof(*attr)) == (uint8_t *)spec);
 	*attr = (struct ibv_flow_attr){
 		.type = IBV_FLOW_ATTR_NORMAL,
+		.priority = 3,
 		.num_of_specs = 1,
 		.port = priv->port,
 		.flags = 0
@@ -3936,6 +3939,7 @@ struct txq_mp2mr_mbuf_check_data {
 {
 	struct priv *priv = dev->data->dev_private;
 	unsigned int i = 0;
+	unsigned int err = 0;
 	unsigned int r;
 	struct rxq *rxq;
 
@@ -3985,8 +3989,9 @@ struct txq_mp2mr_mbuf_check_data {
 		return -ret;
 	} while ((--r) && ((rxq = (*priv->rxqs)[++i]), i));
 	priv_dev_interrupt_handler_install(priv, dev);
+	err = mlx4_priv_flow_start(priv);
 	priv_unlock(priv);
-	return 0;
+	return -err;
 }
 
 /**
@@ -4021,6 +4026,7 @@ struct txq_mp2mr_mbuf_check_data {
 		rxq = (*priv->rxqs)[0];
 		r = priv->rxqs_n;
 	}
+	mlx4_priv_flow_stop(priv);
 	/* Iterate only once when RSS is enabled. */
 	do {
 		/* Ignore nonexistent RX queues. */
@@ -5022,6 +5028,55 @@ struct txq_mp2mr_mbuf_check_data {
 	return -ret;
 }
 
+const struct rte_flow_ops mlx4_flow_ops = {
+	.validate = mlx4_flow_validate,
+	.create = mlx4_flow_create,
+	.destroy = mlx4_flow_destroy,
+	.flush = mlx4_flow_flush,
+	.query = NULL,
+};
+
+/**
+ * Manage filter operations.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param filter_type
+ *   Filter type.
+ * @param filter_op
+ *   Operation to perform.
+ * @param arg
+ *   Pointer to operation-specific structure.
+ *
+ * @return
+ *   0 on success, negative errno value on failure.
+ */
+static int
+mlx4_dev_filter_ctrl(struct rte_eth_dev *dev,
+		     enum rte_filter_type filter_type,
+		     enum rte_filter_op filter_op,
+		     void *arg)
+{
+	int ret = EINVAL;
+
+	switch (filter_type) {
+	case RTE_ETH_FILTER_GENERIC:
+		if (filter_op != RTE_ETH_FILTER_GET)
+			return -EINVAL;
+		*(const void **)arg = &mlx4_flow_ops;
+		return 0;
+	case RTE_ETH_FILTER_FDIR:
+		DEBUG("%p: filter type FDIR is not supported by this PMD",
+		      (void *)dev);
+		break;
+	default:
+		ERROR("%p: filter type (%d) not supported",
+		      (void *)dev, filter_type);
+		break;
+	}
+	return -ret;
+}
+
 static const struct eth_dev_ops mlx4_dev_ops = {
 	.dev_configure = mlx4_dev_configure,
 	.dev_start = mlx4_dev_start,
@@ -5056,6 +5111,7 @@ struct txq_mp2mr_mbuf_check_data {
 	.mac_addr_add = mlx4_mac_addr_add,
 	.mac_addr_set = mlx4_mac_addr_set,
 	.mtu_set = mlx4_dev_set_mtu,
+	.filter_ctrl = mlx4_dev_filter_ctrl,
 };
 
 /**
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index 70c9ecd..fac408b 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -295,6 +295,8 @@ struct txq {
 	struct ibv_exp_res_domain *rd; /* Resource Domain. */
 };
 
+struct rte_flow;
+
 struct priv {
 	struct rte_eth_dev *dev; /* Ethernet device. */
 	struct ibv_context *ctx; /* Verbs context. */
@@ -337,6 +339,7 @@ struct priv {
 	struct rxq *(*rxqs)[]; /* RX queues. */
 	struct txq *(*txqs)[]; /* TX queues. */
 	struct rte_intr_handle intr_handle; /* Interrupt handler. */
+	LIST_HEAD(mlx4_flows, rte_flow) flows;
 	rte_spinlock_t lock; /* Lock for control functions. */
 };
 
diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
new file mode 100644
index 0000000..2328a18
--- /dev/null
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -0,0 +1,1053 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2017 6WIND S.A.
+ *   Copyright 2017 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 <assert.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_flow.h>
+#include <rte_flow_driver.h>
+#include <rte_malloc.h>
+
+/* Generated configuration header. */
+#include "mlx4_autoconf.h"
+
+/* PMD headers. */
+#include "mlx4.h"
+#include "mlx4_flow.h"
+
+/** 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 mlx4_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;
+	/**
+	 * 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, negative value otherwise.
+	 */
+	int (*validate)(const struct rte_flow_item *item,
+			const uint8_t *mask, unsigned int size);
+	/**
+	 * 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_END,
+};
+
+/**
+ * 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
+mlx4_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 mlx4_flow *flow = (struct mlx4_flow *)data;
+	struct ibv_flow_spec_eth *eth;
+	const unsigned int eth_size = sizeof(struct ibv_flow_spec_eth);
+	unsigned int i;
+
+	++flow->ibv_attr->num_of_specs;
+	flow->ibv_attr->priority = 2;
+	eth = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
+	*eth = (struct ibv_flow_spec_eth) {
+		.type = IBV_FLOW_SPEC_ETH,
+		.size = eth_size,
+	};
+	if (!spec) {
+		flow->ibv_attr->type = IBV_FLOW_ATTR_ALL_DEFAULT;
+		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);
+	memcpy(eth->mask.dst_mac, mask->dst.addr_bytes, ETHER_ADDR_LEN);
+	memcpy(eth->mask.src_mac, mask->src.addr_bytes, ETHER_ADDR_LEN);
+	/* 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];
+	}
+	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
+mlx4_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 mlx4_flow *flow = (struct mlx4_flow *)data;
+	struct ibv_flow_spec_eth *eth;
+	const unsigned int eth_size = sizeof(struct ibv_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
+mlx4_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 mlx4_flow *flow = (struct mlx4_flow *)data;
+	struct ibv_flow_spec_ipv4 *ipv4;
+	unsigned int ipv4_size = sizeof(struct ibv_flow_spec_ipv4);
+
+	++flow->ibv_attr->num_of_specs;
+	flow->ibv_attr->priority = 1;
+	ipv4 = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
+	*ipv4 = (struct ibv_flow_spec_ipv4) {
+		.type = IBV_FLOW_SPEC_IPV4,
+		.size = ipv4_size,
+	};
+	if (!spec)
+		return 0;
+	ipv4->val = (struct ibv_flow_ipv4_filter) {
+		.src_ip = spec->hdr.src_addr,
+		.dst_ip = spec->hdr.dst_addr,
+	};
+	if (!mask)
+		mask = default_mask;
+	ipv4->mask = (struct ibv_flow_ipv4_filter) {
+		.src_ip = mask->hdr.src_addr,
+		.dst_ip = mask->hdr.dst_addr,
+	};
+	/* Remove unwanted bits from values. */
+	ipv4->val.src_ip &= ipv4->mask.src_ip;
+	ipv4->val.dst_ip &= ipv4->mask.dst_ip;
+	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
+mlx4_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 mlx4_flow *flow = (struct mlx4_flow *)data;
+	struct ibv_flow_spec_tcp_udp *udp;
+	unsigned int udp_size = sizeof(struct ibv_flow_spec_tcp_udp);
+
+	++flow->ibv_attr->num_of_specs;
+	flow->ibv_attr->priority = 0;
+	udp = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
+	*udp = (struct ibv_flow_spec_tcp_udp) {
+		.type = IBV_FLOW_SPEC_UDP,
+		.size = udp_size,
+	};
+	if (!spec)
+		return 0;
+	udp->val.dst_port = spec->hdr.dst_port;
+	udp->val.src_port = spec->hdr.src_port;
+	if (!mask)
+		mask = default_mask;
+	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
+mlx4_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 mlx4_flow *flow = (struct mlx4_flow *)data;
+	struct ibv_flow_spec_tcp_udp *tcp;
+	unsigned int tcp_size = sizeof(struct ibv_flow_spec_tcp_udp);
+
+	++flow->ibv_attr->num_of_specs;
+	flow->ibv_attr->priority = 0;
+	tcp = (void *)((uintptr_t)flow->ibv_attr + flow->offset);
+	*tcp = (struct ibv_flow_spec_tcp_udp) {
+		.type = IBV_FLOW_SPEC_TCP,
+		.size = tcp_size,
+	};
+	if (!spec)
+		return 0;
+	tcp->val.dst_port = spec->hdr.dst_port;
+	tcp->val.src_port = spec->hdr.src_port;
+	if (!mask)
+		mask = default_mask;
+	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;
+}
+
+/**
+ * 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, negative value otherwise.
+ */
+static int
+mlx4_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->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;
+}
+
+static int
+mlx4_flow_validate_eth(const struct rte_flow_item *item,
+		       const uint8_t *mask, unsigned int size)
+{
+	if (item->mask) {
+		const struct rte_flow_item_eth *mask = item->mask;
+
+		if (mask->dst.addr_bytes[0] != 0xff ||
+				mask->dst.addr_bytes[1] != 0xff ||
+				mask->dst.addr_bytes[2] != 0xff ||
+				mask->dst.addr_bytes[3] != 0xff ||
+				mask->dst.addr_bytes[4] != 0xff ||
+				mask->dst.addr_bytes[5] != 0xff)
+			return -1;
+	}
+	return mlx4_flow_item_validate(item, mask, size);
+}
+
+static int
+mlx4_flow_validate_vlan(const struct rte_flow_item *item,
+			const uint8_t *mask, unsigned int size)
+{
+	if (item->mask) {
+		const struct rte_flow_item_vlan *mask = item->mask;
+
+		if (mask->tci != 0 &&
+		    ntohs(mask->tci) != 0x0fff)
+			return -1;
+	}
+	return mlx4_flow_item_validate(item, mask, size);
+}
+
+static int
+mlx4_flow_validate_ipv4(const struct rte_flow_item *item,
+			const uint8_t *mask, unsigned int size)
+{
+	if (item->mask) {
+		const struct rte_flow_item_ipv4 *mask = item->mask;
+
+		if (mask->hdr.src_addr != 0 &&
+		    mask->hdr.src_addr != 0xffffffff)
+			return -1;
+		if (mask->hdr.dst_addr != 0 &&
+		    mask->hdr.dst_addr != 0xffffffff)
+			return -1;
+	}
+	return mlx4_flow_item_validate(item, mask, size);
+}
+
+static int
+mlx4_flow_validate_udp(const struct rte_flow_item *item,
+		       const uint8_t *mask, unsigned int size)
+{
+	if (item->mask) {
+		const struct rte_flow_item_udp *mask = item->mask;
+
+		if (mask->hdr.src_port != 0 &&
+		    mask->hdr.src_port != 0xffff)
+			return -1;
+		if (mask->hdr.dst_port != 0 &&
+		    mask->hdr.dst_port != 0xffff)
+			return -1;
+	}
+	return mlx4_flow_item_validate(item, mask, size);
+}
+
+static int
+mlx4_flow_validate_tcp(const struct rte_flow_item *item,
+		       const uint8_t *mask, unsigned int size)
+{
+	if (item->mask) {
+		const struct rte_flow_item_tcp *mask = item->mask;
+
+		if (mask->hdr.src_port != 0 &&
+		    mask->hdr.src_port != 0xffff)
+			return -1;
+		if (mask->hdr.dst_port != 0 &&
+		    mask->hdr.dst_port != 0xffff)
+			return -1;
+	}
+	return mlx4_flow_item_validate(item, mask, size);
+}
+
+/** Graph of supported items and associated actions. */
+static const struct mlx4_flow_items mlx4_flow_items[] = {
+	[RTE_FLOW_ITEM_TYPE_END] = {
+		.items = ITEMS(RTE_FLOW_ITEM_TYPE_ETH),
+	},
+	[RTE_FLOW_ITEM_TYPE_ETH] = {
+		.items = ITEMS(RTE_FLOW_ITEM_TYPE_VLAN,
+			       RTE_FLOW_ITEM_TYPE_IPV4),
+		.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",
+		},
+		.default_mask = &rte_flow_item_eth_mask,
+		.mask_sz = sizeof(struct rte_flow_item_eth),
+		.validate = mlx4_flow_validate_eth,
+		.convert = mlx4_flow_create_eth,
+		.dst_sz = sizeof(struct ibv_flow_spec_eth),
+	},
+	[RTE_FLOW_ITEM_TYPE_VLAN] = {
+		.items = ITEMS(RTE_FLOW_ITEM_TYPE_IPV4),
+		.actions = valid_actions,
+		.mask = &(const struct rte_flow_item_vlan){
+		/* rte_flow_item_vlan_mask is invalid for mlx4. */
+#if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
+			.tci = 0x0fff,
+#else
+			.tci = 0xff0f,
+#endif
+		},
+		.mask_sz = sizeof(struct rte_flow_item_vlan),
+		.validate = mlx4_flow_validate_vlan,
+		.convert = mlx4_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,
+			},
+		},
+		.default_mask = &rte_flow_item_ipv4_mask,
+		.mask_sz = sizeof(struct rte_flow_item_ipv4),
+		.validate = mlx4_flow_validate_ipv4,
+		.convert = mlx4_flow_create_ipv4,
+		.dst_sz = sizeof(struct ibv_flow_spec_ipv4),
+	},
+	[RTE_FLOW_ITEM_TYPE_UDP] = {
+		.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),
+		.validate = mlx4_flow_validate_udp,
+		.convert = mlx4_flow_create_udp,
+		.dst_sz = sizeof(struct ibv_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),
+		.validate = mlx4_flow_validate_tcp,
+		.convert = mlx4_flow_create_tcp,
+		.dst_sz = sizeof(struct ibv_flow_spec_tcp_udp),
+	},
+};
+
+/**
+ * Validate a flow supported by the NIC.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param[in] attr
+ *   Flow rule attributes.
+ * @param[in] items
+ *   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.
+ *
+ * @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 mlx4_flow *flow)
+{
+	const struct mlx4_flow_items *cur_item = mlx4_flow_items;
+	struct mlx4_flow_action action = {
+		.queue = 0,
+		.drop = 0,
+	};
+
+	(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;
+	}
+	/* Go over items list. */
+	for (; items->type != RTE_FLOW_ITEM_TYPE_END; ++items) {
+		const struct mlx4_flow_items *token = NULL;
+		unsigned int i;
+		int err;
+
+		if (items->type == RTE_FLOW_ITEM_TYPE_VOID)
+			continue;
+		/*
+		 * The nic can support patterns with NULL eth spec only
+		 * if eth is a single item in a rule.
+		 */
+		if (!items->spec &&
+			items->type == RTE_FLOW_ITEM_TYPE_ETH) {
+			const struct rte_flow_item *next = items + 1;
+
+			if (next->type != RTE_FLOW_ITEM_TYPE_END) {
+				rte_flow_error_set(error, ENOTSUP,
+						   RTE_FLOW_ERROR_TYPE_ITEM,
+						   items,
+						   "the rule requires"
+						   " an Ethernet spec");
+				return -rte_errno;
+			}
+		}
+		for (i = 0;
+		     cur_item->items &&
+		     cur_item->items[i] != RTE_FLOW_ITEM_TYPE_END;
+		     ++i) {
+			if (cur_item->items[i] == items->type) {
+				token = &mlx4_flow_items[items->type];
+				break;
+			}
+		}
+		if (!token)
+			goto exit_item_not_supported;
+		cur_item = token;
+		err = cur_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;
+		}
+		flow->offset += cur_item->dst_sz;
+	}
+	/* Go over actions list */
+	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;
+
+			if (!queue || (queue->index > (priv->rxqs_n - 1)))
+				goto exit_action_not_supported;
+			action.queue = 1;
+		} else {
+			goto exit_action_not_supported;
+		}
+	}
+	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
+mlx4_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 mlx4_flow flow = { .offset = sizeof(struct ibv_flow_attr) };
+
+	priv_lock(priv);
+	ret = priv_flow_validate(priv, attr, items, actions, error, &flow);
+	priv_unlock(priv);
+	return ret;
+}
+
+/**
+ * Complete flow rule creation.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param ibv_attr
+ *   Verbs flow attributes.
+ * @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 ibv_flow_attr *ibv_attr,
+			      struct mlx4_flow_action *action,
+			      struct rte_flow_error *error)
+{
+	struct rxq *rxq;
+	struct ibv_qp *qp;
+	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;
+	}
+	rxq = (*priv->rxqs)[action->queue_id];
+	if (action->drop) {
+		rte_flow->cq =
+			ibv_exp_create_cq(priv->ctx, 1, NULL, NULL, 0,
+					  &(struct ibv_exp_cq_init_attr){
+						  .comp_mask = 0,
+					  });
+		if (!rte_flow->cq) {
+			rte_flow_error_set(error, ENOMEM,
+					   RTE_FLOW_ERROR_TYPE_HANDLE,
+					   NULL, "cannot allocate CQ");
+			goto error;
+		}
+		rte_flow->qp = ibv_exp_create_qp(
+			priv->ctx,
+			&(struct ibv_exp_qp_init_attr){
+				.send_cq = rte_flow->cq,
+				.recv_cq = rte_flow->cq,
+				.cap = {
+					.max_recv_wr = 1,
+					.max_recv_sge = 1,
+				},
+				.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_RES_DOMAIN,
+				.pd = priv->pd,
+				.res_domain = rxq->rd,
+				.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;
+		}
+		qp = rte_flow->qp;
+	} else {
+		rte_flow->rxq = rxq;
+		qp = rxq->qp;
+	}
+	rte_flow->ibv_attr = ibv_attr;
+	rte_flow->ibv_flow = ibv_create_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->cq)
+		ibv_destroy_cq(rte_flow->cq);
+	if (rte_flow->qp)
+		ibv_destroy_qp(rte_flow->qp);
+	rte_free(rte_flow->ibv_attr);
+	rte_free(rte_flow);
+	return NULL;
+}
+
+/**
+ * Convert a flow.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param[in] attr
+ *   Flow rule attributes.
+ * @param[in] items
+ *   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 mlx4_flow_action action;
+	struct mlx4_flow flow = { .offset = sizeof(struct ibv_flow_attr), };
+	int err;
+
+	err = priv_flow_validate(priv, attr, items, actions, error, &flow);
+	if (err)
+		return NULL;
+	flow.ibv_attr = rte_malloc(__func__, flow.offset, 0);
+	if (!flow.ibv_attr) {
+		rte_flow_error_set(error, ENOMEM, RTE_FLOW_ERROR_TYPE_HANDLE,
+				   NULL, "cannot allocate ibv_attr memory");
+		return NULL;
+	}
+	flow.offset = sizeof(struct ibv_flow_attr);
+	*flow.ibv_attr = (struct ibv_flow_attr){
+		.comp_mask = 0,
+		.type = IBV_FLOW_ATTR_NORMAL,
+		.size = sizeof(struct ibv_flow_attr),
+		.priority = attr->priority,
+		.num_of_specs = 0,
+		.port = priv->port,
+		.flags = 0,
+	};
+	claim_zero(priv_flow_validate(priv, attr, items, actions,
+				      error, &flow));
+	action = (struct mlx4_flow_action){
+		.queue = 0,
+		.drop = 0,
+	};
+	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_QUEUE) {
+			action.queue = 1;
+			action.queue_id =
+				((const struct rte_flow_action_queue *)
+				 actions->conf)->index;
+		} else if (actions->type == RTE_FLOW_ACTION_TYPE_DROP) {
+			action.drop = 1;
+		} else {
+			rte_flow_error_set(error, ENOTSUP,
+					   RTE_FLOW_ERROR_TYPE_ACTION,
+					   actions, "unsupported action");
+			goto exit;
+		}
+	}
+	rte_flow = priv_flow_create_action_queue(priv, flow.ibv_attr,
+						 &action, error);
+	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 *
+mlx4_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_destroy_flow(flow->ibv_flow));
+	if (flow->qp)
+		claim_zero(ibv_destroy_qp(flow->qp));
+	if (flow->cq)
+		claim_zero(ibv_destroy_cq(flow->cq));
+	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
+mlx4_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
+mlx4_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;
+}
+
+/**
+ * Remove all flows.
+ *
+ * Called by dev_stop() to remove all flows.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ */
+void
+mlx4_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_destroy_flow(flow->ibv_flow));
+		flow->ibv_flow = NULL;
+		DEBUG("Flow %p removed", (void *)flow);
+	}
+}
+
+/**
+ * Add all flows.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ *
+ * @return
+ *   0 on success, a errno value otherwise and rte_errno is set.
+ */
+int
+mlx4_priv_flow_start(struct priv *priv)
+{
+	struct ibv_qp *qp;
+	struct rte_flow *flow;
+
+	for (flow = LIST_FIRST(&priv->flows);
+	     flow;
+	     flow = LIST_NEXT(flow, next)) {
+		qp = flow->qp ? flow->qp : flow->rxq->qp;
+		flow->ibv_flow = ibv_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);
+	}
+	return 0;
+}
diff --git a/drivers/net/mlx4/mlx4_flow.h b/drivers/net/mlx4/mlx4_flow.h
new file mode 100644
index 0000000..537ffdf
--- /dev/null
+++ b/drivers/net/mlx4/mlx4_flow.h
@@ -0,0 +1,104 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2017 6WIND S.A.
+ *   Copyright 2017 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.
+ */
+
+#ifndef RTE_PMD_MLX4_FLOW_H_
+#define RTE_PMD_MLX4_FLOW_H_
+
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/queue.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_flow.h>
+#include <rte_flow_driver.h>
+#include <rte_byteorder.h>
+
+#include "mlx4.h"
+
+struct rte_flow {
+	LIST_ENTRY(rte_flow) next; /**< Pointer to the next flow structure. */
+	struct rxq *rxq; /**< Pointer to the queue, NULL if drop queue. */
+	struct ibv_flow *ibv_flow; /**< Verbs flow. */
+	struct ibv_flow_attr *ibv_attr; /**< Pointer to Verbs attributes. */
+	struct ibv_qp *qp; /**< Verbs queue pair. */
+	struct ibv_cq *cq; /**< Verbs completion queue. */
+};
+
+int
+mlx4_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 rte_flow *
+mlx4_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);
+
+int
+mlx4_flow_destroy(struct rte_eth_dev *,
+		  struct rte_flow *,
+		  struct rte_flow_error *);
+
+int
+mlx4_flow_flush(struct rte_eth_dev *dev,
+		struct rte_flow_error *error);
+
+/** Structure to pass to the conversion function. */
+struct mlx4_flow {
+	struct ibv_flow_attr *ibv_attr; /**< Verbs attribute. */
+	unsigned int offset; /**< Offset in bytes in the ibv_attr buffer. */
+};
+
+struct mlx4_flow_action {
+	uint32_t drop:1; /**< Target is a drop queue. */
+	uint32_t queue:1; /**< Target is a receive queue. */
+	uint32_t queue_id; /**< Identifier of the queue. */
+};
+
+int mlx4_priv_flow_start(struct priv *);
+void mlx4_priv_flow_stop(struct priv *);
+
+#endif /* RTE_PMD_MLX4_FLOW_H_ */
-- 
1.8.3.1