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net: rps: support 802.1Q

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For the 802.1Q packets, if the NIC doesn't support hw-accel-vlan-rx, RPS
won't inspect the internal 4 tuples to generate skb->rxhash, so this kind
of traffic can't get any benefit from RPS.

This patch adds the support for 802.1Q to RPS.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Changli Gao 2011-08-18 22:07:54 -07:00 committed by David S. Miller
parent 939cf3069d
commit 1ff1986fc9
1 changed files with 8 additions and 0 deletions
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8
net/core/dev.c
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@ -2529,6 +2529,7 @@ void __skb_get_rxhash(struct sk_buff *skb)
int nhoff, hash = 0, poff;
const struct ipv6hdr *ip6;
const struct iphdr *ip;
const struct vlan_hdr *vlan;
u8 ip_proto;
u32 addr1, addr2;
u16 proto;
@ -2565,6 +2566,13 @@ again:
addr2 = (__force u32) ip6->daddr.s6_addr32[3];
nhoff += 40;
break;
case __constant_htons(ETH_P_8021Q):
if (!pskb_may_pull(skb, sizeof(*vlan) + nhoff))
goto done;
vlan = (const struct vlan_hdr *) (skb->data + nhoff);
proto = vlan->h_vlan_encapsulated_proto;
nhoff += sizeof(*vlan);
goto again;
default:
goto done;
}