net/mlx5: query vport index match mode and parameters

There new kernel/rdma_core [1] supports matching on metadata
register instead of vport field to provide operations over
VF LAG bonding configurations. The patch retrieves parameters
and information about the way is engaged to match vport on E-Switch.

[1] http://patchwork.ozlabs.org/cover/1122170/
    "Mellanox, mlx5 vport metadata matching"

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>

drivers/net/mlx5/mlx5.c

@@ -1562,6 +1562,9 @@ mlx5_dev_spawn(struct rte_device *dpdk_dev,
 	int own_domain_id = 0;
 	uint16_t port_id;
 	unsigned int i;
+#ifdef HAVE_MLX5DV_DR_DEVX_PORT
+	struct mlx5dv_devx_port devx_port;
+#endif
 
 	/* Determine if this port representor is supposed to be spawned. */
 	if (switch_info->representor && dpdk_dev->devargs) {
@@ -1782,8 +1785,56 @@ mlx5_dev_spawn(struct rte_device *dpdk_dev,
 	priv->representor = !!switch_info->representor;
 	priv->master = !!switch_info->master;
 	priv->domain_id = RTE_ETH_DEV_SWITCH_DOMAIN_ID_INVALID;
+	priv->vport_meta_tag = 0;
+	priv->vport_meta_mask = 0;
+#ifdef HAVE_MLX5DV_DR_DEVX_PORT
 	/*
-	 * Currently we support single E-Switch per PF configurations
+	 * The DevX port query API is implemented. E-Switch may use
+	 * either vport or reg_c[0] metadata register to match on
+	 * vport index. The engaged part of metadata register is
+	 * defined by mask.
+	 */
+	devx_port.comp_mask = MLX5DV_DEVX_PORT_VPORT |
+			      MLX5DV_DEVX_PORT_MATCH_REG_C_0;
+	err = mlx5dv_query_devx_port(sh->ctx, spawn->ibv_port, &devx_port);
+	if (err) {
+		DRV_LOG(WARNING, "can't query devx port %d on device %s\n",
+			spawn->ibv_port, spawn->ibv_dev->name);
+		devx_port.comp_mask = 0;
+	}
+	if (devx_port.comp_mask & MLX5DV_DEVX_PORT_MATCH_REG_C_0) {
+		priv->vport_meta_tag = devx_port.reg_c_0.value;
+		priv->vport_meta_mask = devx_port.reg_c_0.mask;
+		if (!priv->vport_meta_mask) {
+			DRV_LOG(ERR, "vport zero mask for port %d"
+				     " on bonding device %s\n",
+				     spawn->ibv_port, spawn->ibv_dev->name);
+			err = ENOTSUP;
+			goto error;
+		}
+		if (priv->vport_meta_tag & ~priv->vport_meta_mask) {
+			DRV_LOG(ERR, "invalid vport tag for port %d"
+				     " on bonding device %s\n",
+				     spawn->ibv_port, spawn->ibv_dev->name);
+			err = ENOTSUP;
+			goto error;
+		}
+	} else if (devx_port.comp_mask & MLX5DV_DEVX_PORT_VPORT) {
+		priv->vport_id = devx_port.vport_num;
+	} else if (spawn->pf_bond >= 0) {
+		DRV_LOG(ERR, "can't deduce vport index for port %d"
+			     " on bonding device %s\n",
+			     spawn->ibv_port, spawn->ibv_dev->name);
+		err = ENOTSUP;
+		goto error;
+	} else {
+		/* Suppose vport index in compatible way. */
+		priv->vport_id = switch_info->representor ?
+				 switch_info->port_name + 1 : -1;
+	}
+#else
+	/*
+	 * Kernel/rdma_core support single E-Switch per PF configurations
 	 * only and vport_id field contains the vport index for
 	 * associated VF, which is deduced from representor port name.
 	 * For example, let's have the IB device port 10, it has
@@ -1795,7 +1846,8 @@ mlx5_dev_spawn(struct rte_device *dpdk_dev,
 	 */
 	priv->vport_id = switch_info->representor ?
 			 switch_info->port_name + 1 : -1;
-	/* representor_id field keeps the unmodified port/VF index. */
+#endif
+	/* representor_id field keeps the unmodified VF index. */
 	priv->representor_id = switch_info->representor ?
 			       switch_info->port_name : -1;
 	/*

drivers/net/mlx5/mlx5.h

@@ -620,6 +620,8 @@ struct mlx5_priv {
 	unsigned int counter_fallback:1; /* Use counter fallback management. */
 	uint16_t domain_id; /* Switch domain identifier. */
 	uint16_t vport_id; /* Associated VF vport index (if any). */
+	uint32_t vport_meta_tag; /* Used for vport index match ove VF LAG. */
+	uint32_t vport_meta_mask; /* Used for vport index field match mask. */
 	int32_t representor_id; /* Port representor identifier. */
 	unsigned int if_index; /* Associated kernel network device index. */
 	/* RX/TX queues. */