net/mlx5: LAG, block multipath LAG for SD devices

SD devices are not compatible with multipath LAG since they use
dedicated SD LAG for cross-socket connectivity. Add an SD check
to the multipath prereq validation to prevent multipath LAG
activation on SD-configured ports.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260531113954.395443-10-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
index f42e051fa7e795c0c321fbefed75d553de8e9e14..65c76bd748c6b200c9329c9e65bb68e27029352c 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
@@ -26,6 +26,10 @@ static bool mlx5_lag_multipath_check_prereq(struct mlx5_lag *ldev)
        if (__mlx5_lag_is_active(ldev) && !__mlx5_lag_is_multipath(ldev))
                return false;
 
+       if (__mlx5_lag_is_sd(ldev, mlx5_lag_pf(ldev, idx0)->dev) ||
+           __mlx5_lag_is_sd(ldev, mlx5_lag_pf(ldev, idx1)->dev))
+               return false;
+
        if (ldev->ports > MLX5_LAG_MULTIPATH_OFFLOADS_SUPPORTED_PORTS)
                return false;