[PATCH net] net/mlx5: E-switch, Query port function mac only when vport is enabled

[Tariq Toukan <tariqt@nvidia.com>]

From: Uri Dar <udar@nvidia.com>

Commit eea31f21dce1 ("{rdma,net}/mlx5: Query vports mac address from
device") added a call to mlx5_query_nic_vport_mac_address() in
mlx5_devlink_port_fn_hw_addr_get() without checking whether the vport is
enabled. A port function can be dumped while its vport is not enabled,
for example when SFs are created or destroyed in bulk, and firmware then
rejects the query for a vport it has not allocated:

 mlx5_core 0000:03:00.0: mlx5_cmd_out_err:840:(pid 25225):
 QUERY_NIC_VPORT_CONTEXT(0x754) op_mod(0x0) failed, status bad
 parameter(0x3), syndrome (0x29d722), err(-22)

Query the device only when the vport is enabled; vport->info.mac is
updated under the state_lock already taken here.

Fixes: eea31f21dce1 ("{rdma,net}/mlx5: Query vports mac address from device")
Signed-off-by: Uri Dar <udar@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index c712848b202d..b83c6c02670f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -5121,8 +5121,9 @@ int mlx5_devlink_port_fn_hw_addr_get(struct devlink_port *port,
 
 	mutex_lock(&esw->state_lock);
 
-	mlx5_query_nic_vport_mac_address(esw->dev, vport->vport, true,
-					 vport->info.mac);
+	if (vport->enabled)
+		mlx5_query_nic_vport_mac_address(esw->dev, vport->vport, true,
+						 vport->info.mac);
 	ether_addr_copy(hw_addr, vport->info.mac);
 	*hw_addr_len = ETH_ALEN;
 	mutex_unlock(&esw->state_lock);

base-commit: 1d5e2c57e9ffc134e14b3f837c8d7c53b508bd22
-- 
2.44.0