Re: [PATCH net v2] net: airoha: Fix possible TX queue stall in airoha_qdma_tx_napi_poll()

[Simon Horman <horms@kernel.org>]

On Thu, Apr 16, 2026 at 12:30:12PM +0200, Lorenzo Bianconi wrote:
> Since multiple net_device TX queues can share the same hw QDMA TX queue,
> there is no guarantee we have inflight packets queued in hw belonging to a
> net_device TX queue stopped in the xmit path because hw QDMA TX queue
> can be full. In this corner case the net_device TX queue will never be
> re-activated. In order to avoid any potential net_device TX queue stall,
> we need to wake all the net_device TX queues feeding the same hw QDMA TX
> queue in airoha_qdma_tx_napi_poll routine.
> 
> Fixes: 23020f0493270 ("net: airoha: Introduce ethernet support for EN7581 SoC")
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
> Changes in v2:
> - Add txq_stopped parameter to avoid any possible corner cases where the
>   netdev queue stalls.
> - Link to v1: https://lore.kernel.org/r/20260413-airoha-txq-potential-stall-v1-1-7830363b1543@kernel.org

Reviewed-by: Simon Horman <horms@kernel.org>

FTR, I believe Sashiko's review does not need to block progress of this
patch as it flags pre-existing conditions.