netdev - [PATCH mlx5-next 06/14] net/mlx5: Lag, enable hash mode by default for all NICs

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Date:   Wed,  7 Sep 2022 16:36:28 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>, linux-rdma@...r.kernel.org,
        "Liu, Changcheng" <jerrliu@...dia.com>, Liu@...r.kernel.org,
        Mark Bloch <mbloch@...dia.com>
Subject: [PATCH mlx5-next 06/14] net/mlx5: Lag, enable hash mode by default for all NICs

From: "Liu, Changcheng" <jerrliu@...dia.com>

The firmware supports adding a steering rule to catch egress traffic
of the QPs/TISs which are set port affinity explicitly in hash mode.
Enable that mode for NICS with 2 ports as well.

Signed-off-by: Liu, Changcheng <jerrliu@...dia.com>
Reviewed-by: Mark Bloch <mbloch@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/lag/lag.c   | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
index d4d4d1d1e8c7..97c4a525226b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c
@@ -484,21 +484,22 @@ void mlx5_modify_lag(struct mlx5_lag *ldev,
 		mlx5_lag_drop_rule_setup(ldev, tracker);
 }
 
-#define MLX5_LAG_ROCE_HASH_PORTS_SUPPORTED 4
 static int mlx5_lag_set_port_sel_mode_roce(struct mlx5_lag *ldev,
 					   unsigned long *flags)
 {
-	struct lag_func *dev0 = &ldev->pf[MLX5_LAG_P1];
+	struct mlx5_core_dev *dev0 = ldev->pf[MLX5_LAG_P1].dev;
 
-	if (ldev->ports == MLX5_LAG_ROCE_HASH_PORTS_SUPPORTED) {
-		/* Four ports are support only in hash mode */
-		if (!MLX5_CAP_PORT_SELECTION(dev0->dev, port_select_flow_table))
-			return -EINVAL;
-		set_bit(MLX5_LAG_MODE_FLAG_HASH_BASED, flags);
+	if (!MLX5_CAP_PORT_SELECTION(dev0, port_select_flow_table)) {
 		if (ldev->ports > 2)
-			ldev->buckets = MLX5_LAG_MAX_HASH_BUCKETS;
+			return -EINVAL;
+		return 0;
 	}
 
+	if (ldev->ports > 2)
+		ldev->buckets = MLX5_LAG_MAX_HASH_BUCKETS;
+
+	set_bit(MLX5_LAG_MODE_FLAG_HASH_BASED, flags);
+
 	return 0;
 }
 
-- 
2.37.2