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net: dsa: tag_8021q: only call skb_push/skb_pull around __skb_vlan_pop 

__skb_vlan_pop() needs skb->data to point at the mac_header, while
skb_vlan_tag_present() and skb_vlan_tag_get() don't, because they don't
look at skb->data at all.

So we can avoid uselessly moving around skb->data for the case where the
VLAN tag was offloaded by the DSA master.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20220215204722.2134816-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2022-02-15 22:47:22 +02:00 committed by Jakub Kicinski
parent a5e516d026
commit c862033595
1 changed files with 2 additions and 2 deletions
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4
net/dsa/tag_8021q.c
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@ -577,14 +577,14 @@ void dsa_8021q_rcv(struct sk_buff *skb, int *source_port, int *switch_id)
{
u16 vid, tci;
skb_push_rcsum(skb, ETH_HLEN);
if (skb_vlan_tag_present(skb)) {
tci = skb_vlan_tag_get(skb);
__vlan_hwaccel_clear_tag(skb);
} else {
skb_push_rcsum(skb, ETH_HLEN);
__skb_vlan_pop(skb, &tci);
skb_pull_rcsum(skb, ETH_HLEN);
}
skb_pull_rcsum(skb, ETH_HLEN);
vid = tci & VLAN_VID_MASK;