net: airoha: Fix possible TX queue stall in airoha_qdma_tx_napi_poll()

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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: 23020f0493 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260416-airoha-txq-potential-stall-v2-1-42c732074540@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Lorenzo Bianconi 2026-04-16 12:30:12 +02:00 • committed by Jakub Kicinski

parent 2091c6aa0d

commit b94769eb2f

2 changed files with 33 additions and 5 deletions

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37

drivers/net/ethernet/airoha/airoha_eth.c

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1

drivers/net/ethernet/airoha/airoha_eth.h

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