netdev - [net-next 09/15] net/mlx5: Lag, support single FDB only on 2 ports

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Date:   Mon,  9 May 2022 22:57:37 -0700
From:   Saeed Mahameed <saeedm@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, Mark Bloch <mbloch@...dia.com>,
        Maor Gottlieb <maorg@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 09/15] net/mlx5: Lag, support single FDB only on 2 ports

From: Mark Bloch <mbloch@...dia.com>

E-Switch currently doesn't support more than 2 E-Switch managers
being aggregated under a single hardware lag. Have specific checks
to disallow creating lag when the code doesn't support it.

Signed-off-by: Mark Bloch <mbloch@...dia.com>
Reviewed-by: Maor Gottlieb <maorg@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
index deac240e6d78..4678b50b7e18 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
@@ -458,6 +458,7 @@ static int mlx5_deactivate_lag(struct mlx5_lag *ldev)
 	return 0;
 }
 
+#define MLX5_LAG_OFFLOADS_SUPPORTED_PORTS 2
 static bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
 {
 #ifdef CONFIG_MLX5_ESWITCH
@@ -470,6 +471,9 @@ static bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
 #ifdef CONFIG_MLX5_ESWITCH
 	mode = mlx5_eswitch_mode(ldev->pf[MLX5_LAG_P1].dev);
 
+	if (mode == MLX5_ESWITCH_OFFLOADS && ldev->ports != MLX5_LAG_OFFLOADS_SUPPORTED_PORTS)
+		return false;
+
 	return (mode == MLX5_ESWITCH_NONE || mode == MLX5_ESWITCH_OFFLOADS) &&
 		(mlx5_eswitch_mode(ldev->pf[MLX5_LAG_P1].dev) ==
 		 mlx5_eswitch_mode(ldev->pf[MLX5_LAG_P2].dev));
-- 
2.35.1