From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 13 Jul 2010 05:24:20 +0000 (+0000)
Subject: net: skb_tx_hash() fix relative to skb_orphan_try()
X-Git-Tag: v2.6.35-rc6~15^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87fd308cfc6b2e880bf717a740bd5c58d2aed10c;p=pandora-kernel.git

net: skb_tx_hash() fix relative to skb_orphan_try()

commit fc6055a5ba31e2 (net: Introduce skb_orphan_try()) added early
orphaning of skbs.

This unfortunately added a performance regression in skb_tx_hash() in
case of stacked devices (bonding, vlans, ...)

Since skb->sk is now NULL, we cannot access sk->sk_hash anymore to
spread tx packets to multiple NIC queues on multiqueue devices.

skb_tx_hash() in this case only uses skb->protocol, same value for all
flows.

skb_orphan_try() can copy sk->sk_hash into skb->rxhash and skb_tx_hash()
can use this saved sk_hash value to compute its internal hash value.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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