netdev - [PATCH vhost 09/22] virtio_net: separate virtnet_rx

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Date: Wed, 11 Oct 2023 17:27:15 +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 09/22] virtio_net: separate virtnet_rx_resize()

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

* virtnet_rx_pause
* virtnet_rx_resume

Then the subsequent reset rx for xsk can share these two functions.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio/main.c       | 29 +++++++++++++++++++++--------
 drivers/net/virtio/virtio_net.h |  3 +++
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index f32cfa189972..ffab59da8506 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -2126,26 +2126,39 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-static int virtnet_rx_resize(struct virtnet_info *vi,
-			     struct virtnet_rq *rq, u32 ring_num)
+void virtnet_rx_pause(struct virtnet_info *vi, struct virtnet_rq *rq)
 {
 	bool running = netif_running(vi->dev);
-	int err, qindex;
-
-	qindex = rq - vi->rq;
 
 	if (running)
 		napi_disable(&rq->napi);
+}
 
-	err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf);
-	if (err)
-		netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
+void virtnet_rx_resume(struct virtnet_info *vi, struct virtnet_rq *rq)
+{
+	bool running = netif_running(vi->dev);
 
 	if (!try_fill_recv(vi, rq, GFP_KERNEL))
 		schedule_delayed_work(&vi->refill, 0);
 
 	if (running)
 		virtnet_napi_enable(rq->vq, &rq->napi);
+}
+
+static int virtnet_rx_resize(struct virtnet_info *vi,
+			     struct virtnet_rq *rq, u32 ring_num)
+{
+	int err, qindex;
+
+	qindex = rq - vi->rq;
+
+	virtnet_rx_pause(vi, rq);
+
+	err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf);
+	if (err)
+		netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
+
+	virtnet_rx_resume(vi, rq);
 	return err;
 }
 
diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
index 282504d6639a..70eea23adba6 100644
--- a/drivers/net/virtio/virtio_net.h
+++ b/drivers/net/virtio/virtio_net.h
@@ -253,4 +253,7 @@ static inline bool virtnet_is_xdp_raw_buffer_queue(struct virtnet_info *vi, int
 	else
 		return false;
 }
+
+void virtnet_rx_pause(struct virtnet_info *vi, struct virtnet_rq *rq);
+void virtnet_rx_resume(struct virtnet_info *vi, struct virtnet_rq *rq);
 #endif
-- 
2.32.0.3.g01195cf9f