linux-kernel - [PATCH net-next 1/9] net: lantiq_etop: use netif_receive_skb

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Message-ID: <20240930202434.296960-2-rosenp@gmail.com>
Date: Mon, 30 Sep 2024 13:24:26 -0700
From: Rosen Penev <rosenp@...il.com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-kernel@...r.kernel.org,
	olek2@...pl,
	shannon.nelson@....com
Subject: [PATCH net-next 1/9] net: lantiq_etop: use netif_receive_skb_list

Improves cache efficiency by batching rx skb processing. Small
performance improvement on RX.

Signed-off-by: Rosen Penev <rosenp@...il.com>
---
 drivers/net/ethernet/lantiq_etop.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
index 3c289bfe0a09..94b37c12f3f7 100644
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -122,8 +122,7 @@ ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
 	return 0;
 }
 
-static void
-ltq_etop_hw_receive(struct ltq_etop_chan *ch)
+static void ltq_etop_hw_receive(struct ltq_etop_chan *ch, struct list_head *lh)
 {
 	struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 	struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
@@ -143,7 +142,7 @@ ltq_etop_hw_receive(struct ltq_etop_chan *ch)
 
 	skb_put(skb, len);
 	skb->protocol = eth_type_trans(skb, ch->netdev);
-	netif_receive_skb(skb);
+	list_add_tail(&skb->list, lh);
 }
 
 static int
@@ -151,6 +150,7 @@ ltq_etop_poll_rx(struct napi_struct *napi, int budget)
 {
 	struct ltq_etop_chan *ch = container_of(napi,
 				struct ltq_etop_chan, napi);
+	LIST_HEAD(rx_list);
 	int work_done = 0;
 
 	while (work_done < budget) {
@@ -158,9 +158,12 @@ ltq_etop_poll_rx(struct napi_struct *napi, int budget)
 
 		if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) != LTQ_DMA_C)
 			break;
-		ltq_etop_hw_receive(ch);
+		ltq_etop_hw_receive(ch, &rx_list);
 		work_done++;
 	}
+
+	netif_receive_skb_list(&rx_list);
+
 	if (work_done < budget) {
 		napi_complete_done(&ch->napi, work_done);
 		ltq_dma_ack_irq(&ch->dma);
-- 
2.46.2