netdev - [PATCH vhost 10/22] virtio_net: separate virtnet_tx

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Message-Id: <20231011092728.105904-11-xuanzhuo@linux.alibaba.com>
Date: Wed, 11 Oct 2023 17:27:16 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: virtualization@...ts.linux-foundation.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH vhost 10/22] virtio_net: separate virtnet_tx_resize()

This patch separates two sub-functions from virtnet_tx_resize():

* virtnet_tx_pause
* virtnet_tx_resume

Then the subsequent virtnet_tx_reset() can share these two functions.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/main.c       | 35 +++++++++++++++++++++++++++------
 drivers/net/virtio/virtio_net.h |  2 ++
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index ffab59da8506..fb4a9cd98e0c 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -2162,12 +2162,11 @@ static int virtnet_rx_resize(struct virtnet_info *vi,
 	return err;
 }
 
-static int virtnet_tx_resize(struct virtnet_info *vi,
-			     struct virtnet_sq *sq, u32 ring_num)
+void virtnet_tx_pause(struct virtnet_info *vi, struct virtnet_sq *sq)
 {
 	bool running = netif_running(vi->dev);
 	struct netdev_queue *txq;
-	int err, qindex;
+	int qindex;
 
 	qindex = sq - vi->sq;
 
@@ -2188,10 +2187,17 @@ static int virtnet_tx_resize(struct virtnet_info *vi,
 	netif_stop_subqueue(vi->dev, qindex);
 
 	__netif_tx_unlock_bh(txq);
+}
 
-	err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
-	if (err)
-		netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
+void virtnet_tx_resume(struct virtnet_info *vi, struct virtnet_sq *sq)
+{
+	bool running = netif_running(vi->dev);
+	struct netdev_queue *txq;
+	int qindex;
+
+	qindex = sq - vi->sq;
+
+	txq = netdev_get_tx_queue(vi->dev, qindex);
 
 	__netif_tx_lock_bh(txq);
 	sq->reset = false;
@@ -2200,6 +2206,23 @@ static int virtnet_tx_resize(struct virtnet_info *vi,
 
 	if (running)
 		virtnet_napi_tx_enable(vi, sq->vq, &sq->napi);
+}
+
+static int virtnet_tx_resize(struct virtnet_info *vi, struct virtnet_sq *sq,
+			     u32 ring_num)
+{
+	int qindex, err;
+
+	qindex = sq - vi->sq;
+
+	virtnet_tx_pause(vi, sq);
+
+	err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
+	if (err)
+		netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
+
+	virtnet_tx_resume(vi, sq);
+
 	return err;
 }
 
diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
index 70eea23adba6..2f930af35364 100644
--- a/drivers/net/virtio/virtio_net.h
+++ b/drivers/net/virtio/virtio_net.h
@@ -256,4 +256,6 @@ static inline bool virtnet_is_xdp_raw_buffer_queue(struct virtnet_info *vi, int
 
 void virtnet_rx_pause(struct virtnet_info *vi, struct virtnet_rq *rq);
 void virtnet_rx_resume(struct virtnet_info *vi, struct virtnet_rq *rq);
+void virtnet_tx_pause(struct virtnet_info *vi, struct virtnet_sq *sq);
+void virtnet_tx_resume(struct virtnet_info *vi, struct virtnet_sq *sq);
 #endif
-- 
2.32.0.3.g01195cf9f