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net: airoha: stop net_device TX queue before updating CPU index

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Currently, airoha_eth driver updates the CPU index register prior of
verifying whether the number of free descriptors has fallen below the
threshold.
Move net_device TX queue length check before updating the TX CPU index
in order to update TX CPU index even if there are more packets to be
transmitted but the net_device TX queue is going to be stopped
accounting the inflight packets.

Fixes: 1d30417410 ("net: airoha: Implement BQL support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260421-airoha-xmit-stop-condition-v1-1-e670d6a48467@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2026-04-21 08:43:07 +02:00 committed by Jakub Kicinski
parent 2d9f5a1182
commit 3854de7b38
1 changed files with 4 additions and 5 deletions
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9
drivers/net/ethernet/airoha/airoha_eth.c
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@ -2094,17 +2094,16 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
skb_tx_timestamp(skb);
netdev_tx_sent_queue(txq, skb->len);
if (q->ndesc - q->queued < q->free_thr) {
netif_tx_stop_queue(txq);
q->txq_stopped = true;
}
if (netif_xmit_stopped(txq) || !netdev_xmit_more())
airoha_qdma_rmw(qdma, REG_TX_CPU_IDX(qid),
TX_RING_CPU_IDX_MASK,
FIELD_PREP(TX_RING_CPU_IDX_MASK, index));
if (q->ndesc - q->queued < q->free_thr) {
netif_tx_stop_queue(txq);
q->txq_stopped = true;
}
spin_unlock_bh(&q->lock);
return NETDEV_TX_OK;