[dpdk-dev] [PATCH 07/17] mlx5: define specific flow steering rules for each hash RX QP

[Adrien Mazarguil]

From: Olga Shern <olgas at mellanox.com>

All hash RX QPs currently use the same flow steering rule (L2 MAC filtering)
regardless of their type (TCP, UDP, IPv4, IPv6), which prevents them from
being dispatched properly. This is fixed by adding flow information to the
hash RX queue initialization data and generating specific flow steering
rules for each of them.

Signed-off-by: Olga Shern <olgas at mellanox.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
---
 drivers/net/mlx5/mlx5_mac.c  | 22 +++++--------
 drivers/net/mlx5/mlx5_rxq.c  | 78 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_rxtx.h | 21 ++++++++++++
 3 files changed, 107 insertions(+), 14 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_mac.c b/drivers/net/mlx5/mlx5_mac.c
index 971f2cd..bf69095 100644
--- a/drivers/net/mlx5/mlx5_mac.c
+++ b/drivers/net/mlx5/mlx5_mac.c
@@ -251,14 +251,10 @@ hash_rxq_add_flow(struct hash_rxq *hash_rxq, unsigned int mac_index,
 	const uint8_t (*mac)[ETHER_ADDR_LEN] =
 			(const uint8_t (*)[ETHER_ADDR_LEN])
 			priv->mac[mac_index].addr_bytes;
-
-	/* Allocate flow specification on the stack. */
-	struct __attribute__((packed)) {
-		struct ibv_flow_attr attr;
-		struct ibv_flow_spec_eth spec;
-	} data;
-	struct ibv_flow_attr *attr = &data.attr;
-	struct ibv_flow_spec_eth *spec = &data.spec;
+	FLOW_ATTR_SPEC_ETH(data, priv_populate_flow_attr(priv, NULL, 0,
+							 hash_rxq->type));
+	struct ibv_flow_attr *attr = &data->attr;
+	struct ibv_flow_spec_eth *spec = &data->spec;
 
 	assert(mac_index < RTE_DIM(priv->mac));
 	assert((vlan_index < RTE_DIM(priv->vlan_filter)) || (vlan_index == -1u));
@@ -267,12 +263,10 @@ hash_rxq_add_flow(struct hash_rxq *hash_rxq, unsigned int mac_index,
 	 * This layout is expected by libibverbs.
 	 */
 	assert(((uint8_t *)attr + sizeof(*attr)) == (uint8_t *)spec);
-	*attr = (struct ibv_flow_attr){
-		.type = IBV_FLOW_ATTR_NORMAL,
-		.num_of_specs = 1,
-		.port = priv->port,
-		.flags = 0
-	};
+	priv_populate_flow_attr(priv, attr, sizeof(data), hash_rxq->type);
+	/* The first specification must be Ethernet. */
+	assert(spec->type == IBV_FLOW_SPEC_ETH);
+	assert(spec->size == sizeof(*spec));
 	*spec = (struct ibv_flow_spec_eth){
 		.type = IBV_FLOW_SPEC_ETH,
 		.size = sizeof(*spec),
diff --git a/drivers/net/mlx5/mlx5_rxq.c b/drivers/net/mlx5/mlx5_rxq.c
index 606367c..7f25688 100644
--- a/drivers/net/mlx5/mlx5_rxq.c
+++ b/drivers/net/mlx5/mlx5_rxq.c
@@ -71,19 +71,43 @@ static const struct hash_rxq_init hash_rxq_init[] = {
 				IBV_EXP_RX_HASH_DST_IPV4 |
 				IBV_EXP_RX_HASH_SRC_PORT_TCP |
 				IBV_EXP_RX_HASH_DST_PORT_TCP),
+		.flow_priority = 0,
+		.flow_spec.tcp_udp = {
+			.type = IBV_FLOW_SPEC_TCP,
+			.size = sizeof(hash_rxq_init[0].flow_spec.tcp_udp),
+		},
+		.underlayer = &hash_rxq_init[HASH_RXQ_IPv4],
 	},
 	[HASH_RXQ_UDPv4] = {
 		.hash_fields = (IBV_EXP_RX_HASH_SRC_IPV4 |
 				IBV_EXP_RX_HASH_DST_IPV4 |
 				IBV_EXP_RX_HASH_SRC_PORT_UDP |
 				IBV_EXP_RX_HASH_DST_PORT_UDP),
+		.flow_priority = 0,
+		.flow_spec.tcp_udp = {
+			.type = IBV_FLOW_SPEC_UDP,
+			.size = sizeof(hash_rxq_init[0].flow_spec.tcp_udp),
+		},
+		.underlayer = &hash_rxq_init[HASH_RXQ_IPv4],
 	},
 	[HASH_RXQ_IPv4] = {
 		.hash_fields = (IBV_EXP_RX_HASH_SRC_IPV4 |
 				IBV_EXP_RX_HASH_DST_IPV4),
+		.flow_priority = 1,
+		.flow_spec.ipv4 = {
+			.type = IBV_FLOW_SPEC_IPV4,
+			.size = sizeof(hash_rxq_init[0].flow_spec.ipv4),
+		},
+		.underlayer = &hash_rxq_init[HASH_RXQ_ETH],
 	},
 	[HASH_RXQ_ETH] = {
 		.hash_fields = 0,
+		.flow_priority = 2,
+		.flow_spec.eth = {
+			.type = IBV_FLOW_SPEC_ETH,
+			.size = sizeof(hash_rxq_init[0].flow_spec.eth),
+		},
+		.underlayer = NULL,
 	},
 };
 
@@ -125,6 +149,60 @@ static uint8_t hash_rxq_default_key[] = {
 };
 
 /**
+ * Populate flow steering rule for a given hash RX queue type using
+ * information from hash_rxq_init[]. Nothing is written to flow_attr when
+ * flow_attr_size is not large enough, but the required size is still returned.
+ *
+ * @param[in] priv
+ *   Pointer to private structure.
+ * @param[out] flow_attr
+ *   Pointer to flow attribute structure to fill. Note that the allocated
+ *   area must be larger and large enough to hold all flow specifications.
+ * @param flow_attr_size
+ *   Entire size of flow_attr and trailing room for flow specifications.
+ * @param type
+ *   Requested hash RX queue type.
+ *
+ * @return
+ *   Total size of the flow attribute buffer. No errors are defined.
+ */
+size_t
+priv_populate_flow_attr(const struct priv *priv,
+			struct ibv_flow_attr *flow_attr,
+			size_t flow_attr_size,
+			enum hash_rxq_type type)
+{
+	size_t offset = sizeof(*flow_attr);
+	const struct hash_rxq_init *init = &hash_rxq_init[type];
+
+	assert((size_t)type < RTE_DIM(hash_rxq_init));
+	do {
+		offset += init->flow_spec.hdr.size;
+		init = init->underlayer;
+	} while (init != NULL);
+	if (offset > flow_attr_size)
+		return offset;
+	flow_attr_size = offset;
+	init = &hash_rxq_init[type];
+	*flow_attr = (struct ibv_flow_attr){
+		.type = IBV_FLOW_ATTR_NORMAL,
+		.priority = init->flow_priority,
+		.num_of_specs = 0,
+		.port = priv->port,
+		.flags = 0,
+	};
+	do {
+		offset -= init->flow_spec.hdr.size;
+		memcpy((void *)((uintptr_t)flow_attr + offset),
+		       &init->flow_spec,
+		       init->flow_spec.hdr.size);
+		++flow_attr->num_of_specs;
+		init = init->underlayer;
+	} while (init != NULL);
+	return flow_attr_size;
+}
+
+/**
  * Return nearest power of two above input value.
  *
  * @param v
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index d9fa13e..00b5d6c 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -34,6 +34,7 @@
 #ifndef RTE_PMD_MLX5_RXTX_H_
 #define RTE_PMD_MLX5_RXTX_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
 /* Verbs header. */
@@ -129,9 +130,27 @@ enum hash_rxq_type {
 	HASH_RXQ_ETH,
 };
 
+/* Flow structure with Ethernet specification. It is packed to prevent padding
+ * between attr and spec as this layout is expected by libibverbs. */
+struct flow_attr_spec_eth {
+	struct ibv_flow_attr attr;
+	struct ibv_flow_spec_eth spec;
+} __attribute__((packed));
+
+/* Define a struct flow_attr_spec_eth object as an array of at least
+ * "size" bytes. Room after the first index is normally used to store
+ * extra flow specifications. */
+#define FLOW_ATTR_SPEC_ETH(name, size) \
+	struct flow_attr_spec_eth name \
+		[((size) / sizeof(struct flow_attr_spec_eth)) + \
+		 !!((size) % sizeof(struct flow_attr_spec_eth))]
+
 /* Initialization data for hash RX queue. */
 struct hash_rxq_init {
 	uint64_t hash_fields; /* Fields that participate in the hash. */
+	unsigned int flow_priority; /* Flow priority to use. */
+	struct ibv_flow_spec flow_spec; /* Flow specification template. */
+	const struct hash_rxq_init *underlayer; /* Pointer to underlayer. */
 };
 
 /* Initialization data for indirection table. */
@@ -197,6 +216,8 @@ struct txq {
 
 /* mlx5_rxq.c */
 
+size_t priv_populate_flow_attr(const struct priv *, struct ibv_flow_attr *,
+			       size_t, enum hash_rxq_type);
 int priv_create_hash_rxqs(struct priv *);
 void priv_destroy_hash_rxqs(struct priv *);
 void rxq_cleanup(struct rxq *);
-- 
2.1.0