netdev - [PATCH net-next] net: airoha: Implement BQL support

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Message-Id: <20240930-en7581-bql-v1-1-064cdd570068@kernel.org>
Date: Mon, 30 Sep 2024 14:58:35 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>, Felix Fietkau <nbd@....name>, 
 Sean Wang <sean.wang@...iatek.com>, Mark Lee <Mark-MC.Lee@...iatek.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org, 
 upstream@...oha.com
Subject: [PATCH net-next] net: airoha: Implement BQL support

Introduce BQL support in the airoha_eth driver to avoid queuing to much
packets into the device hw queues and keep the latency small.

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index 930f180688e5..6dfde2828d93 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -786,6 +786,7 @@ struct airoha_hw_stats {
 };
 
 struct airoha_qdma {
+	struct airoha_gdm_port *port;
 	struct airoha_eth *eth;
 	void __iomem *regs;
 
@@ -1658,6 +1659,7 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget)
 
 	while (irq_q->queued > 0 && done < budget) {
 		u32 qid, last, val = irq_q->q[irq_q->head];
+		u32 bytes = 0, count = 0;
 		struct airoha_queue *q;
 
 		if (val == 0xff)
@@ -1684,7 +1686,6 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget)
 			struct airoha_qdma_desc *desc = &q->desc[q->tail];
 			struct airoha_queue_entry *e = &q->entry[q->tail];
 			u32 desc_ctrl = le32_to_cpu(desc->ctrl);
-			struct sk_buff *skb = e->skb;
 			u16 index = q->tail;
 
 			if (!(desc_ctrl & QDMA_DESC_DONE_MASK) &&
@@ -1700,15 +1701,11 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget)
 			WRITE_ONCE(desc->msg0, 0);
 			WRITE_ONCE(desc->msg1, 0);
 
-			if (skb) {
-				struct netdev_queue *txq;
-
-				txq = netdev_get_tx_queue(skb->dev, qid);
-				if (netif_tx_queue_stopped(txq) &&
-				    q->ndesc - q->queued >= q->free_thr)
-					netif_tx_wake_queue(txq);
+			if (e->skb) {
+				bytes += e->skb->len;
+				count++;
 
-				dev_kfree_skb_any(skb);
+				dev_kfree_skb_any(e->skb);
 				e->skb = NULL;
 			}
 
@@ -1716,6 +1713,16 @@ static int airoha_qdma_tx_napi_poll(struct napi_struct *napi, int budget)
 				break;
 		}
 
+		if (qdma->port) {
+			struct netdev_queue *txq;
+
+			txq = netdev_get_tx_queue(qdma->port->dev, qid);
+			netdev_tx_completed_queue(txq, count, bytes);
+			if (netif_tx_queue_stopped(txq) &&
+			    q->ndesc - q->queued >= q->free_thr)
+				netif_tx_wake_queue(txq);
+		}
+
 		spin_unlock_bh(&q->lock);
 	}
 
@@ -2482,6 +2489,7 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
 	q->head = index;
 	q->queued += i;
 
+	netdev_tx_sent_queue(txq, skb->len);
 	skb_tx_timestamp(skb);
 	if (q->ndesc - q->queued < q->free_thr)
 		netif_tx_stop_queue(txq);
@@ -2650,6 +2658,7 @@ static int airoha_alloc_gdm_port(struct airoha_eth *eth, struct device_node *np)
 	port->dev = dev;
 	port->id = id;
 	eth->ports[index] = port;
+	qdma->port = port;
 
 	return register_netdev(dev);
 }

---
base-commit: c824deb1a89755f70156b5cdaf569fca80698719
change-id: 20240930-en7581-bql-552566f2078e

Best regards,
-- 
Lorenzo Bianconi <lorenzo@...nel.org>