netdev - [PATCH v3 4/6] virtio-net: fix per queue coalescing parameter setting

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Message-Id: <c2188831f03c4096910847c134aeff256204d1ea.1696745452.git.hengqi@linux.alibaba.com>
Date: Sun,  8 Oct 2023 14:27:42 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Cc: Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Gavin Li <gavinl@...dia.com>
Subject: [PATCH v3 4/6] virtio-net: fix per queue coalescing parameter setting

When the user sets a non-zero coalescing parameter to 0 for a specific
virtqueue, it does not work as expected, so let's fix this.

Fixes: 394bd87764b6 ("virtio_net: support per queue interrupt coalesce command")
Reported-by: Xiaoming Zhao <zxm377917@...baba-inc.com>
Cc: Gavin Li <gavinl@...dia.com>
Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
Acked-by: Jason Wang <jasowang@...hat.com>
---
v2->v3:
    1. Add the ack tag.

v1->v2:
    1. Remove useless comments.

 drivers/net/virtio_net.c | 36 ++++++++++++++++--------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 6120dd5343dd..12ec3ae19b60 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3296,27 +3296,23 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
 {
 	int err;
 
-	if (ec->rx_coalesce_usecs || ec->rx_max_coalesced_frames) {
-		err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
-						    ec->rx_coalesce_usecs,
-						    ec->rx_max_coalesced_frames);
-		if (err)
-			return err;
-		/* Save parameters */
-		vi->rq[queue].intr_coal.max_usecs = ec->rx_coalesce_usecs;
-		vi->rq[queue].intr_coal.max_packets = ec->rx_max_coalesced_frames;
-	}
+	err = virtnet_send_ctrl_coal_vq_cmd(vi, rxq2vq(queue),
+					    ec->rx_coalesce_usecs,
+					    ec->rx_max_coalesced_frames);
+	if (err)
+		return err;
 
-	if (ec->tx_coalesce_usecs || ec->tx_max_coalesced_frames) {
-		err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
-						    ec->tx_coalesce_usecs,
-						    ec->tx_max_coalesced_frames);
-		if (err)
-			return err;
-		/* Save parameters */
-		vi->sq[queue].intr_coal.max_usecs = ec->tx_coalesce_usecs;
-		vi->sq[queue].intr_coal.max_packets = ec->tx_max_coalesced_frames;
-	}
+	vi->rq[queue].intr_coal.max_usecs = ec->rx_coalesce_usecs;
+	vi->rq[queue].intr_coal.max_packets = ec->rx_max_coalesced_frames;
+
+	err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(queue),
+					    ec->tx_coalesce_usecs,
+					    ec->tx_max_coalesced_frames);
+	if (err)
+		return err;
+
+	vi->sq[queue].intr_coal.max_usecs = ec->tx_coalesce_usecs;
+	vi->sq[queue].intr_coal.max_packets = ec->tx_max_coalesced_frames;
 
 	return 0;
 }
-- 
2.19.1.6.gb485710b