netdev - [net-next V2 06/14] net/mlx5: LAG, block multipath LAG in case ldev have more than 2 ports

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Message-Id: <20230607210410.88209-7-saeed@kernel.org>
Date: Wed,  7 Jun 2023 14:04:02 -0700
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
	netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	linux-rdma@...r.kernel.org,
	Shay Drory <shayd@...dia.com>,
	Mark Bloch <mbloch@...dia.com>
Subject: [net-next V2 06/14] net/mlx5: LAG, block multipath LAG in case ldev have more than 2 ports

From: Shay Drory <shayd@...dia.com>

multipath LAG is not supported over more than two ports. Add a check in
order to block multipath LAG over such configurations.

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

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
index d85a8dfc153d..976caa8e6922 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/mp.c
@@ -14,6 +14,7 @@ static bool __mlx5_lag_is_multipath(struct mlx5_lag *ldev)
 	return ldev->mode == MLX5_LAG_MODE_MULTIPATH;
 }
 
+#define MLX5_LAG_MULTIPATH_OFFLOADS_SUPPORTED_PORTS 2
 static bool mlx5_lag_multipath_check_prereq(struct mlx5_lag *ldev)
 {
 	if (!mlx5_lag_is_ready(ldev))
@@ -22,6 +23,9 @@ 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 (ldev->ports > MLX5_LAG_MULTIPATH_OFFLOADS_SUPPORTED_PORTS)
+		return false;
+
 	return mlx5_esw_multipath_prereq(ldev->pf[MLX5_LAG_P1].dev,
 					 ldev->pf[MLX5_LAG_P2].dev);
 }
-- 
2.40.1