[dpdk-dev] [PATCH] net/mlx5: fix RSS flow action hash type selection

[Shahaf Shuler <shahafs@mellanox.com>]

On the code after the below commits, the criteria to select the IPV4 or
IPV6 hash functions was the existence of some ETH_RSS_IPV4 RSS types on
the flow rule.

The check is wrong. For example ETH_RSS_NONFRAG_IPV4_TCP will not select
the IPV4 hash which will cause the packet to be spread in a bad way.

Fix it by adding the corresponding types needed for each hash selection.

Fixes: 592f05b29a25 ("net/mlx5: add RSS flow action")
Fixes: fd0b70316bca ("net/mlx5: support inner RSS computation")
Cc: stable@dpdk.org
Cc: nelio.laranjeiro@6wind.com
Cc: orika@mellanox.com

Reported-by: Yaroslav Brustinov <ybrustin@cisco.com>
Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
---

Few notes:
1. this patch should be backported to 18.08 stable
2. There is more work planned in 18.11 for the flow engine.
   The work should be on top of this fix.

---
 drivers/net/mlx5/mlx5_flow.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index ca4625b699..da96932da5 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -1053,6 +1053,8 @@ mlx5_flow_item_ipv4(const struct rte_flow_item *item, struct rte_flow *flow,
 		mlx5_flow_verbs_hashfields_adjust
 			(flow, tunnel,
 			 (ETH_RSS_IPV4 | ETH_RSS_FRAG_IPV4 |
+			  ETH_RSS_NONFRAG_IPV4_TCP |
+			  ETH_RSS_NONFRAG_IPV4_UDP |
 			  ETH_RSS_NONFRAG_IPV4_OTHER),
 			 (IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4));
 		flow->cur_verbs->attr->priority = MLX5_PRIORITY_MAP_L3;
@@ -1188,7 +1190,11 @@ mlx5_flow_item_ipv6(const struct rte_flow_item *item, struct rte_flow *flow,
 	if (size <= flow_size) {
 		mlx5_flow_verbs_hashfields_adjust
 			(flow, tunnel,
-			 (ETH_RSS_IPV6 | ETH_RSS_NONFRAG_IPV6_OTHER),
+			 (ETH_RSS_IPV6 |
+			  ETH_RSS_NONFRAG_IPV6_TCP | ETH_RSS_NONFRAG_IPV6_UDP |
+			  ETH_RSS_NONFRAG_IPV6_OTHER | ETH_RSS_IPV6_EX |
+			  ETH_RSS_IPV6_TCP_EX | ETH_RSS_IPV6_UDP_EX |
+			  ETH_RSS_FRAG_IPV6 | ETH_RSS_NONFRAG_IPV6_OTHER),
 			 (IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6));
 		flow->cur_verbs->attr->priority = MLX5_PRIORITY_MAP_L3;
 		mlx5_flow_spec_verbs_add(flow, &ipv6, size);
-- 
2.12.0