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Date: Fri, 19 Aug 2011 13:05:53 +0800
From: Changli Gao <xiaosuo@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <eric.dumazet@...il.com>,
Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org,
Changli Gao <xiaosuo@...il.com>
Subject: net: rps: support 802.1Q
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@...il.com>
---
net/core/dev.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/core/dev.c b/net/core/dev.c
index ead0366..be7ee50 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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;
}
--
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