linux-kernel - [PATCH net-next 1/2] net/mlx5: Warn when write combining is not supported

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Message-ID: <1748173652-1377161-2-git-send-email-tariqt@nvidia.com>
Date: Sun, 25 May 2025 14:47:31 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "Andrew
 Lunn" <andrew+netdev@...n.ch>
CC: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, <netdev@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Moshe Shemesh
	<moshe@...dia.com>, Mark Bloch <mbloch@...dia.com>, Gal Pressman
	<gal@...dia.com>, Maor Gottlieb <maorg@...dia.com>
Subject: [PATCH net-next 1/2] net/mlx5: Warn when write combining is not supported

From: Maor Gottlieb <maorg@...dia.com>

Warn if write combining is not supported, as it can impact latency.
Add the warning message to be printed only when the driver actually
run the test and detect unsupported state, rather than when
inheriting parent's result for SFs.

Signed-off-by: Maor Gottlieb <maorg@...dia.com>
Reviewed-by: Michael Guralnik <michaelgur@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/wc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/wc.c b/drivers/net/ethernet/mellanox/mlx5/core/wc.c
index 740b719e7072..2f0316616fa4 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/wc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/wc.c
@@ -378,6 +378,9 @@ static void mlx5_core_test_wc(struct mlx5_core_dev *mdev)
 	mlx5_free_bfreg(mdev, &sq->bfreg);
 err_alloc_bfreg:
 	kfree(sq);
+
+	if (mdev->wc_state == MLX5_WC_STATE_UNSUPPORTED)
+		mlx5_core_warn(mdev, "Write combining is not supported\n");
 }
 
 bool mlx5_wc_support_get(struct mlx5_core_dev *mdev)
-- 
2.31.1