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Subject[PATCH v2 2/3] virtio_net: Add missing virtio header in skb for XDP_PASS
Date
For the XDP_PASS scenario of the XDP path, the skb constructed with
xdp_buff does not include the virtio header. Adding the virtio header
information back when creating the skb.

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
---
drivers/net/virtio_net.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index b56828804e5f..2de46eb4c661 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1270,6 +1270,9 @@ static struct sk_buff *receive_small_xdp(struct net_device *dev,
if (unlikely(!skb))
goto err;

+ /* Store the original virtio header for subsequent use by the driver. */
+ memcpy(skb_vnet_common_hdr(skb), &virtnet_xdp.hdr, vi->hdr_len);
+
if (metasize)
skb_metadata_set(skb, metasize);

@@ -1635,6 +1638,9 @@ static struct sk_buff *receive_mergeable_xdp(struct net_device *dev,
head_skb = build_skb_from_xdp_buff(dev, vi, xdp, xdp_frags_truesz);
if (unlikely(!head_skb))
break;
+ /* Store the original virtio header for subsequent use by the driver. */
+ memcpy(skb_vnet_common_hdr(head_skb), &virtnet_xdp.hdr, vi->hdr_len);
+
return head_skb;

case XDP_TX:
--
2.40.1

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