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net: Add frag_list support to GSO

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This patch allows GSO to handle frag_list in a limited way for the
purposes of allowing packets merged by GRO to be refragmented on
output.

Most hardware won't (and aren't expected to) support handling GRO
frag_list packets directly.  Therefore we will perform GSO in
software for those cases.

However, for drivers that can support it (such as virtual NICs) we
may not have to segment the packets at all.

Whether the added overhead of GRO/GSO is worthwhile for bridges
and routers when weighed against the benefit of potentially
increasing the MTU within the host is still an open question.
However, for the case of host nodes this is undoubtedly a win.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2008-12-15 23:27:47 -08:00 committed by David S. Miller
parent 89319d3801
commit 1a881f27c5
2 changed files with 2 additions and 2 deletions
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2
include/linux/netdevice.h
View File

@ -1858,6 +1858,8 @@ static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
{
return skb_is_gso(skb) &&
(!skb_gso_ok(skb, dev->features) ||
(skb_shinfo(skb)->frag_list &&
!(dev->features & NETIF_F_FRAGLIST)) ||
unlikely(skb->ip_summed != CHECKSUM_PARTIAL));
}

2
net/core/dev.c
View File

@ -1533,8 +1533,6 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
__be16 type = skb->protocol;
int err;
BUG_ON(skb_shinfo(skb)->frag_list);
skb_reset_mac_header(skb);
skb->mac_len = skb->network_header - skb->mac_header;
__skb_pull(skb, skb->mac_len);