linux-kernel - [PATCH] virtio_net: simplify tx queue wake condition check

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Message-ID: <20250702014139.721-1-liming.wu@jaguarmicro.com>
Date: Wed,  2 Jul 2025 09:41:39 +0800
From: liming.wu@...uarmicro.com
To: "Michael S . Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>
Cc: kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	angus.chen@...uarmicro.com,
	Liming Wu <liming.wu@...uarmicro.com>
Subject: [PATCH] virtio_net: simplify tx queue wake condition check

From: Liming Wu <liming.wu@...uarmicro.com>

Consolidate the two nested if conditions for checking tx queue wake
conditions into a single combined condition. This improves code
readability without changing functionality. And move netif_tx_wake_queue
into if condition to reduce unnecessary checks for queue stops.

Signed-off-by: Liming Wu <liming.wu@...uarmicro.com>
---
 drivers/net/virtio_net.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index e53ba600605a..6f3d69feb427 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2998,12 +2998,11 @@ static void virtnet_poll_cleantx(struct receive_queue *rq, int budget)
 			free_old_xmit(sq, txq, !!budget);
 		} while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
 
-		if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
-			if (netif_tx_queue_stopped(txq)) {
-				u64_stats_update_begin(&sq->stats.syncp);
-				u64_stats_inc(&sq->stats.wake);
-				u64_stats_update_end(&sq->stats.syncp);
-			}
+		if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS &&
+		    netif_tx_queue_stopped(txq)) {
+			u64_stats_update_begin(&sq->stats.syncp);
+			u64_stats_inc(&sq->stats.wake);
+			u64_stats_update_end(&sq->stats.syncp);
 			netif_tx_wake_queue(txq);
 		}
 
@@ -3195,12 +3194,11 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
 	else
 		free_old_xmit(sq, txq, !!budget);
 
-	if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
-		if (netif_tx_queue_stopped(txq)) {
-			u64_stats_update_begin(&sq->stats.syncp);
-			u64_stats_inc(&sq->stats.wake);
-			u64_stats_update_end(&sq->stats.syncp);
-		}
+	if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS &&
+	    netif_tx_queue_stopped(txq)) {
+		u64_stats_update_begin(&sq->stats.syncp);
+		u64_stats_inc(&sq->stats.wake);
+		u64_stats_update_end(&sq->stats.syncp);
 		netif_tx_wake_queue(txq);
 	}
 
-- 
2.34.1