net/mlx5e: Check for qos capability in dcbnl_initialize

qos capability is the master capability bit that determines
if the DCBX is supported for the PCI function. If this bit is off,
driver cannot run any dcbx code.

Fixes: e207b7e99176 ("net/mlx5e: ConnectX-4 firmware support for DCBX")
Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
index 2eb54d36e16eac77e3a9d0387758d66b51584bd3..810b51029c7f5cd1e8d2e5abcb9eee7b563da8c8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
@@ -754,6 +754,9 @@ void mlx5e_dcbnl_initialize(struct mlx5e_priv *priv)
 {
        struct mlx5e_dcbx *dcbx = &priv->dcbx;
 
+       if (!MLX5_CAP_GEN(priv->mdev, qos))
+               return;
+
        if (MLX5_CAP_GEN(priv->mdev, dcbx))
                mlx5e_dcbnl_query_dcbx_mode(priv, &dcbx->mode);