[PATCH 5.11 178/210] net/mlx5: Fix HW spec violation configuring uplink

Greg Kroah-Hartman
2021-04-12T09:43:33Z

From: Eli Cohen <elic@nvidia.com>

[ Upstream commit 1a73704c82ed4ee95532ac04645d02075bd1ce3d ]

Make sure to modify uplink port to follow only if the uplink_follow
capability is set as required by the HW spec. Failure to do so causes
traffic to the uplink representor net device to cease after switching to
switchdev mode.

Fixes: 7d0314b11cdd ("net/mlx5e: Modify uplink state on interface up/down")
Signed-off-by: Eli Cohen <elic@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index f0ceae65f6cf..8afbb485197e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -1103,8 +1103,9 @@ static void mlx5e_uplink_rep_enable(struct mlx5e_priv *priv)

mlx5e_rep_tc_enable(priv);

- mlx5_modify_vport_admin_state(mdev, MLX5_VPORT_STATE_OP_MOD_UPLINK,
- 0, 0, MLX5_VPORT_ADMIN_STATE_AUTO);
+ if (MLX5_CAP_GEN(mdev, uplink_follow))
+ mlx5_modify_vport_admin_state(mdev, MLX5_VPORT_STATE_OP_MOD_UPLINK,
+ 0, 0, MLX5_VPORT_ADMIN_STATE_AUTO);
mlx5_lag_add(mdev, netdev);
priv->events_nb.notifier_call = uplink_rep_async_event;
mlx5_notifier_register(mdev, &priv->events_nb);
--
2.30.2