[PATCH] net/mlx5: fix non-ip packets are not delivered when RSS hash type ESP is used.

[Maayan Kashani]

Non-ip packets such as ARP or LACP are not delivered if you use RTE flow rule with empty pattern and rss action with specific combination of RSS hash types: "ipv4-tcp ipv4-udp ipv4-other ipv6-tcp ipv6-udp ipv6-other esp".

The stack which used for RSS expansion was overflowed and trashed rss expanstion data(buf->entry[MLX5_RSS_EXP_ELT_N]). Use bigger stack size instead. And add relevant ASSERT for the future.

Signed-off-by: Maayan Kashani<mkashani at nvidia.com>
Acked-by: Ori Kam<orika at nvidia.com>
---
 drivers/net/mlx5/mlx5_flow.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index cf83db7b60..41e298855b 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -374,7 +374,7 @@ mlx5_flow_expand_rss_skip_explicit(const struct mlx5_flow_expand_node graph[],
 	return next;
 }
 
-#define MLX5_RSS_EXP_ELT_N 16
+#define MLX5_RSS_EXP_ELT_N 32
 
 /**
  * Expand RSS flows into several possible flows according to the RSS hash
@@ -539,6 +539,7 @@ mlx5_flow_expand_rss(struct mlx5_flow_expand_rss *buf, size_t size,
 			if (lsize > size)
 				return -EINVAL;
 			n = elt * sizeof(*item);
+			MLX5_ASSERT((buf->entries) < MLX5_RSS_EXP_ELT_N);
 			buf->entry[buf->entries].priority =
 				stack_pos + 1 + missed;
 			buf->entry[buf->entries].pattern = addr;
-- 
2.25.1