[PATCH] net/mlx4: fix empty ETH spec with VLAN support

[Xiaoyu Min]

When the ETH spec is empty MLX4 PMD doesn't allow match other criteria,
which means the flow should be promisc one.

Currently, PMD validates this by setting flow->promisc bit when ETH spec
is empty and checking whether there is other rte_flow_item followed
when flow->promisc is on.

However, commit [1] adds support to match traffic only on VLAN id, the
above validation logic should be changed accordingly.

This patch changes the above validate logic by skipping flow->promisc
check if this item is VLAN.

Fixes: c0d239263156 ("net/mlx4: support flow w/o ETH spec and with VLAN")
Cc: sta...@dpdk.org

[1]:
commit c0d239263156 ("net/mlx4: support flow w/o ETH spec and with VLAN")

Signed-off-by: Xiaoyu Min <jack...@nvidia.com>
Acked-by: Matan Azrad <ma...@nvidia.com>
---
 drivers/net/mlx4/mlx4_flow.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx4/mlx4_flow.c b/drivers/net/mlx4/mlx4_flow.c
index 2e1b6c87e9..9d7247cf81 100644
--- a/drivers/net/mlx4/mlx4_flow.c
+++ b/drivers/net/mlx4/mlx4_flow.c
@@ -713,7 +713,8 @@ mlx4_flow_prepare(struct mlx4_priv *priv,
                        flow->internal = 1;
                        continue;
                }
-               if (flow->promisc || flow->allmulti) {
+               if ((item->type != RTE_FLOW_ITEM_TYPE_VLAN && flow->promisc) ||
+                   flow->allmulti) {
                        msg = "mlx4 does not support additional matching"
                                " criteria combined with indiscriminate"
                                " matching on Ethernet headers";
-- 
2.34.0