Commit 1d304174 authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Jakub Kicinski
Browse files

net: airoha: Implement BQL support 



Introduce BQL support in the airoha_eth driver reporting to the kernel
info about tx hw DMA queues in order to avoid bufferbloat and keep the
latency small.

Signed-off-by: default avatarLorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20241012-en7581-bql-v2-1-4deb4efdb60b@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 57c28e93

drivers/net/ethernet/mediatek/airoha_eth.c

+6 −2
Original line number Diff line number Diff line
@@ -1709,9 +1709,11 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget) 
			WRITE_ONCE(desc->msg1, 0);



			if (skb) {

				u16 queue = skb_get_queue_mapping(skb);

				struct netdev_queue *txq;



				txq = netdev_get_tx_queue(skb->dev, qid);

				txq = netdev_get_tx_queue(skb->dev, queue);

				netdev_tx_completed_queue(txq, 1, skb->len);

				if (netif_tx_queue_stopped(txq) &&

				    q->ndesc - q->queued >= q->free_thr)

					netif_tx_wake_queue(txq);
@@ -2487,7 +2489,9 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb, 
	q->queued += i;



	skb_tx_timestamp(skb);

	if (!netdev_xmit_more())

	netdev_tx_sent_queue(txq, skb->len);



	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, q->head));