Prepare to track skb metadata location independently of MAC header offset.

Following changes will make skb_metadata_set() record where metadata ends
relative to skb->head. Hence the helper must be called when skb->data
points right past the metadata area.

Unlike other drivers, veth calls skb_metadata_set() after eth_type_trans(),
which pulls the Ethernet header and moves skb->data. This violates the
future calling convention.

Adjust the driver to pull the MAC header after calling skb_metadata_set().

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
 drivers/net/veth.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 87a63c4bee77..61f218d83f80 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c

@@ -876,11 +876,11 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq,
 	else
 		skb->data_len = 0;
 
-	skb->protocol = eth_type_trans(skb, rq->dev);
-
 	metalen = xdp->data - xdp->data_meta;
 	if (metalen)
 		skb_metadata_set(skb, metalen);
+
+	skb->protocol = eth_type_trans(skb, rq->dev);
 out:
 	return skb;
 drop:

-- 
2.43.0