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offloading: Make scatter/gather more tolerant of vlans. 

When checking if it is necessary to linearize a packet, we currently
use vlan_features if the packet contains either an in-band or out-
of-band vlan tag.  However, in-band tags aren't special in any way
for scatter/gather since they are part of the packet buffer and are
simply more data to DMA.  Therefore, only use vlan_features for out-
of-band tags, which could potentially have some interaction with
scatter/gather.

Signed-off-by: Jesse Gross <jesse@nicira.com>
CC: Ben Hutchings <bhutchings@solarflare.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesse Gross 2010-10-29 12:14:53 +00:00 committed by David S. Miller
parent 410989f651
commit e1e78db628
1 changed files with 12 additions and 7 deletions
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15
net/core/dev.c
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@ -1976,15 +1976,20 @@ static inline void skb_orphan_try(struct sk_buff *skb)
static inline int skb_needs_linearize(struct sk_buff *skb, static inline int skb_needs_linearize(struct sk_buff *skb,
struct net_device *dev) struct net_device *dev)
{ {
if (skb_is_nonlinear(skb)) {
int features = dev->features; int features = dev->features;
if (skb->protocol == htons(ETH_P_8021Q) || vlan_tx_tag_present(skb)) if (vlan_tx_tag_present(skb))
features &= dev->vlan_features; features &= dev->vlan_features;
return skb_is_nonlinear(skb) && return (skb_has_frag_list(skb) &&
((skb_has_frag_list(skb) && !(features & NETIF_F_FRAGLIST)) || !(features & NETIF_F_FRAGLIST)) ||
(skb_shinfo(skb)->nr_frags && (!(features & NETIF_F_SG) || (skb_shinfo(skb)->nr_frags &&
illegal_highdma(dev, skb)))); (!(features & NETIF_F_SG) ||
illegal_highdma(dev, skb)));
}
return 0;
} }
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,