There are two completely similar and independent implementations. This
is inconvenient for the subsequent addition of new types. So extract a
function from this piece of code and call this function uniformly to
recover old xmit ptr.

Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
Acked-by: Jason Wang <jasow...@redhat.com>
---
 drivers/net/virtio_net.c | 66 +++++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 38 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7929f5d9d059..b01afd19061f 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -351,6 +351,30 @@ static struct xdp_frame *ptr_to_xdp(void *ptr)
        return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
 }
 
+static void __free_old_xmit(struct send_queue *sq, bool in_napi,
+                           u64 *bytes, u64 *packets)
+{
+       unsigned int len;
+       void *ptr;
+
+       while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
+               if (!is_xdp_frame(ptr)) {
+                       struct sk_buff *skb = ptr;
+
+                       pr_debug("Sent skb %p\n", skb);
+
+                       *bytes += skb->len;
+                       napi_consume_skb(skb, in_napi);
+               } else {
+                       struct xdp_frame *frame = ptr_to_xdp(ptr);
+
+                       *bytes += xdp_get_frame_len(frame);
+                       xdp_return_frame(frame);
+               }
+               (*packets)++;
+       }
+}
+
 /* Converting between virtqueue no. and kernel tx/rx queue no.
  * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
  */
@@ -759,27 +783,9 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue 
*vq, void *buf)
 
 static void free_old_xmit(struct send_queue *sq, bool in_napi)
 {
-       unsigned int len;
-       unsigned int packets = 0;
-       unsigned int bytes = 0;
-       void *ptr;
-
-       while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
-               if (likely(!is_xdp_frame(ptr))) {
-                       struct sk_buff *skb = ptr;
-
-                       pr_debug("Sent skb %p\n", skb);
+       u64 bytes = 0, packets = 0;
 
-                       bytes += skb->len;
-                       napi_consume_skb(skb, in_napi);
-               } else {
-                       struct xdp_frame *frame = ptr_to_xdp(ptr);
-
-                       bytes += xdp_get_frame_len(frame);
-                       xdp_return_frame(frame);
-               }
-               packets++;
-       }
+       __free_old_xmit(sq, in_napi, &bytes, &packets);
 
        /* Avoid overhead when no packets have been processed
         * happens when called speculatively from start_xmit.
@@ -929,14 +935,11 @@ static int virtnet_xdp_xmit(struct net_device *dev,
 {
        struct virtnet_info *vi = netdev_priv(dev);
        struct receive_queue *rq = vi->rq;
+       u64 bytes = 0, packets = 0;
        struct bpf_prog *xdp_prog;
        struct send_queue *sq;
-       unsigned int len;
-       int packets = 0;
-       int bytes = 0;
        int nxmit = 0;
        int kicks = 0;
-       void *ptr;
        int ret;
        int i;
 
@@ -955,20 +958,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
        }
 
        /* Free up any pending old buffers before queueing new ones. */
-       while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
-               if (likely(is_xdp_frame(ptr))) {
-                       struct xdp_frame *frame = ptr_to_xdp(ptr);
-
-                       bytes += xdp_get_frame_len(frame);
-                       xdp_return_frame(frame);
-               } else {
-                       struct sk_buff *skb = ptr;
-
-                       bytes += skb->len;
-                       napi_consume_skb(skb, false);
-               }
-               packets++;
-       }
+       __free_old_xmit(sq, false, &bytes, &packets);
 
        for (i = 0; i < n; i++) {
                struct xdp_frame *xdpf = frames[i];
-- 
2.32.0.3.g01195cf9f


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