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net/mlx5: Warn when write combining is not supported

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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@nvidia.com>
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1752009387-13300-5-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Maor Gottlieb 2025-07-09 00:16:26 +03:00 committed by Jakub Kicinski
parent c0ca344d79
commit d980f371b1
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/mellanox/mlx5/core/wc.c
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@ -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)