[dpdk-dev] [PATCH] net/mlx5: set RSS key len 0 to indicate default RSS

[Ophir Munk <ophirmu@mellanox.com>]

Applications which add an RSS flow must supply an RSS key table and an
RSS key length. If an application needs to add the default RSS flow it
should not care about the exact RSS default key table and its length.
By setting key length to 0 - the PMD will know that it should use the
default RSS key table and length.

Signed-off-by: Ophir Munk <ophirmu@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 3f548a9..18eacf5 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -2062,7 +2062,8 @@ struct mlx5_flow_tunnel_info {
 					  RTE_FLOW_ERROR_TYPE_ACTION_CONF,
 					  &rss->level,
 					  "tunnel RSS is not supported");
-	if (rss->key_len < MLX5_RSS_HASH_KEY_LEN)
+	/* key_len 0 means using default RSS key */
+	if (rss->key_len > 0 && rss->key_len < MLX5_RSS_HASH_KEY_LEN)
 		return rte_flow_error_set(error, ENOTSUP,
 					  RTE_FLOW_ERROR_TYPE_ACTION_CONF,
 					  &rss->key_len,
@@ -2106,7 +2107,7 @@ struct mlx5_flow_tunnel_info {
 		memcpy((*flow->queue), rss->queue,
 		       rss->queue_num * sizeof(uint16_t));
 	flow->rss.queue_num = rss->queue_num;
-	memcpy(flow->key, rss->key, MLX5_RSS_HASH_KEY_LEN);
+	memcpy(flow->key, rss->key, rss->key_len);
 	flow->rss.types = rss->types;
 	flow->rss.level = rss->level;
 	flow->fate |= MLX5_FLOW_FATE_RSS;
@@ -2948,7 +2949,7 @@ struct mlx5_flow_tunnel_info {
 					     flow->rss.queue_num);
 			if (!hrxq)
 				hrxq = mlx5_hrxq_new(dev, flow->key,
-						     MLX5_RSS_HASH_KEY_LEN,
+						     flow->rss.key_len,
 						     verbs->hash_fields,
 						     (*flow->queue),
 						     flow->rss.queue_num,
-- 
1.8.3.1