[dpdk-dev] [PATCH] net/mlx5: make FDB default rule optional

[Matan Azrad <matan@mellanox.com>]

There are RDMA-CORE versions which are not supported multi-table for
some Mellanox mlx5 devices.

Hence, the optimization added in commit [1] which forwards all the FDB
traffic to table 1 cannot be configured.

Make the above optimization optional:
Do not fail when either table 1 cannot be created or the jump rule
(all =>jump to table 1) is not configured successfully.
In this case, all the flows will be configured to table 0.

[1] commit b67b4ecbde22 ("net/mlx5: skip table zero to improve
insertion rate")

Cc: stable@dpdk.org

Signed-off-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/mlx5/mlx5.h         |  1 +
 drivers/net/mlx5/mlx5_flow.c    |  6 ++++--
 drivers/net/mlx5/mlx5_flow.h    |  4 ++--
 drivers/net/mlx5/mlx5_flow_dv.c | 11 ++++++-----
 drivers/net/mlx5/mlx5_trigger.c | 11 ++++++++---
 5 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 5818349..1fc2063 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -792,6 +792,7 @@ struct mlx5_priv {
 	/* UAR same-page access control required in 32bit implementations. */
 #endif
 	uint8_t skip_default_rss_reta; /* Skip configuration of default reta. */
+	uint8_t fdb_def_rule; /* Whether fdb jump to table 1 is configured. */
 };
 
 #define PORT_ID(priv) ((priv)->dev_data->port_id)
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 5c9fea6..ffaf8a2 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -5575,6 +5575,8 @@ struct mlx5_flow_counter *
  *   Value is part of flow rule created by request external to PMD.
  * @param[in] group
  *   rte_flow group index value.
+ * @param[out] fdb_def_rule
+ *   Whether fdb jump to table 1 is configured.
  * @param[out] table
  *   HW table value.
  * @param[out] error
@@ -5585,10 +5587,10 @@ struct mlx5_flow_counter *
  */
 int
 mlx5_flow_group_to_table(const struct rte_flow_attr *attributes, bool external,
-			 uint32_t group, uint32_t *table,
+			 uint32_t group, bool fdb_def_rule, uint32_t *table,
 			 struct rte_flow_error *error)
 {
-	if (attributes->transfer && external) {
+	if (attributes->transfer && external && fdb_def_rule) {
 		if (group == UINT32_MAX)
 			return rte_flow_error_set
 						(error, EINVAL,
diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index 39be5ba..82b4292 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -753,8 +753,8 @@ struct mlx5_flow_driver_ops {
 uint32_t mlx5_flow_id_release(struct mlx5_flow_id_pool *pool,
 			      uint32_t id);
 int mlx5_flow_group_to_table(const struct rte_flow_attr *attributes,
-			     bool external, uint32_t group, uint32_t *table,
-			     struct rte_flow_error *error);
+			     bool external, uint32_t group, bool fdb_def_rule,
+			     uint32_t *table, struct rte_flow_error *error);
 uint64_t mlx5_flow_hashfields_adjust(struct mlx5_flow *dev_flow, int tunnel,
 				     uint64_t layer_types,
 				     uint64_t hash_fields);
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index b90734e..d57d360 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -3357,7 +3357,7 @@ struct field_modify_info modify_tcp[] = {
 	target_group =
 		((const struct rte_flow_action_jump *)action->conf)->group;
 	ret = mlx5_flow_group_to_table(attributes, external, target_group,
-				       &table, error);
+				       true, &table, error);
 	if (ret)
 		return ret;
 	if (attributes->group == target_group)
@@ -4334,7 +4334,7 @@ struct field_modify_info modify_tcp[] = {
 	int ret;
 
 	ret = mlx5_flow_group_to_table(attributes, external,
-				       attributes->group,
+				       attributes->group, !!priv->fdb_def_rule,
 				       &table, error);
 	if (ret)
 		return ret;
@@ -7011,7 +7011,7 @@ struct field_modify_info modify_tcp[] = {
 	mhdr_res->ft_type = attr->egress ? MLX5DV_FLOW_TABLE_TYPE_NIC_TX :
 					   MLX5DV_FLOW_TABLE_TYPE_NIC_RX;
 	ret = mlx5_flow_group_to_table(attr, dev_flow->external, attr->group,
-				       &table, error);
+				       !!priv->fdb_def_rule, &table, error);
 	if (ret)
 		return ret;
 	dev_flow->group = table;
@@ -7279,8 +7279,9 @@ struct field_modify_info modify_tcp[] = {
 		case RTE_FLOW_ACTION_TYPE_JUMP:
 			jump_data = action->conf;
 			ret = mlx5_flow_group_to_table(attr, dev_flow->external,
-						       jump_data->group, &table,
-						       error);
+						       jump_data->group,
+						       !!priv->fdb_def_rule,
+						       &table, error);
 			if (ret)
 				return ret;
 			tbl = flow_dv_tbl_resource_get(dev, table,
diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index ab6937a..7e12cd5 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -423,9 +423,14 @@
 		}
 		mlx5_txq_release(dev, i);
 	}
-	if (priv->config.dv_esw_en && !priv->config.vf)
-		if (!mlx5_flow_create_esw_table_zero_flow(dev))
-			goto error;
+	if (priv->config.dv_esw_en && !priv->config.vf) {
+		if (mlx5_flow_create_esw_table_zero_flow(dev))
+			priv->fdb_def_rule = 1;
+		else
+			DRV_LOG(INFO, "port %u FDB default rule cannot be"
+				" configured - only Eswitch group 0 flows are"
+				" supported.", dev->data->port_id);
+	}
 	if (priv->isolated)
 		return 0;
 	if (dev->data->promiscuous) {
-- 
1.8.3.1