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net/mlx5: HWS, Check if device is down while polling for completion

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In case the device is down for any reason (e.g. FLR),
the HW will no longer generate completions - no point
polling and waiting for timeout.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Erez Shitrit <erezsh@nvidia.com>
Reviewed-by: Shay Drori <shayd@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260507173443.320465-2-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yevgeny Kliteynik 2026-05-07 20:34:41 +03:00 committed by Jakub Kicinski
parent a932458165
commit e3ec157089
1 changed files with 12 additions and 0 deletions
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12
drivers/net/ethernet/mellanox/mlx5/core/steering/hws/bwc.c
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@ -422,6 +422,18 @@ int mlx5hws_bwc_queue_poll(struct mlx5hws_context *ctx,
if (!got_comp && !drain)
return 0;
if (unlikely(ctx->mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)) {
/* If the device is down for any reason (e.g. FLR), the HW will
* no longer generate completions.
* Note that ETIMEDOUT is returned here because the BWC layer
* already has a special handling for timeouts - it breaks the
* rehash / resize / shrink loops to avoid chain of timeouts.
*/
mlx5_core_warn_once(ctx->mdev,
"BWC poll: device is down, polling for completion aborted\n");
return -ETIMEDOUT;
}
queue_full = mlx5hws_send_engine_full(&ctx->send_queue[queue_id]);
while (queue_full || ((got_comp || drain) && *pending_rules)) {
ret = mlx5hws_send_queue_poll(ctx, queue_id, comp, burst_th);