From: Eric Dumazet <edumazet@google.com>
Date: Wed, 9 Nov 2022 09:57:59 +0000 (+0000)
Subject: net: gro: no longer use skb_vlan_tag_present()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=be3ed48683f0d7ed808783fd7d919459b58b5b6b;p=linux.git

net: gro: no longer use skb_vlan_tag_present()

We can remove a conditional test in gro_list_prepare()
by comparing vlan_all fields of the two skbs.

Notes:

While comparing the vlan_proto is not strictly needed,
because part of the following compare_ether_header() call,
using 32bit word is actually faster than using 16bit values.

napi_reuse_skb() makes sure to clear skb->vlan_all,
as it already calls __vlan_hwaccel_clear_tag()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/core/gro.c b/net/core/gro.c
index 8e0fe85a647da..fd8c6a7e8d3e2 100644
--- a/net/core/gro.c
+++ b/net/core/gro.c
@@ -370,9 +370,7 @@ static void gro_list_prepare(const struct list_head *head,
 		}
 
 		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
-		diffs |= skb_vlan_tag_present(p) ^ skb_vlan_tag_present(skb);
-		if (skb_vlan_tag_present(p))
-			diffs |= skb_vlan_tag_get(p) ^ skb_vlan_tag_get(skb);
+		diffs |= p->vlan_all ^ skb->vlan_all;
 		diffs |= skb_metadata_differs(p, skb);
 		if (maclen == ETH_HLEN)
 			diffs |= compare_ether_header(skb_mac_header(p),