From: Mark McLoughlin <markmc@redhat.com>
Date: Sun, 8 Jun 2008 10:49:00 +0000 (+1000)
Subject: virtio_net: Fix skb->csum_start computation
X-Git-Tag: v2.6.26-rc6~13^2^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23cde76d801246a702e7a84c3fe3d655b35c89a1;p=pandora-kernel.git

virtio_net: Fix skb->csum_start computation

hdr->csum_start is the offset from the start of the ethernet
header to the transport layer checksum field. skb->csum_start
is the offset from skb->head.

skb_partial_csum_set() assumes that skb->data points to the
ethernet header - i.e. it computes skb->csum_start by adding
the headroom to hdr->csum_start.

Since eth_type_trans() skb_pull()s the ethernet header,
skb_partial_csum_set() should be called before
eth_type_trans().

(Without this patch, GSO packets from a guest to the world outside the
host are corrupted).

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---

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