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sfc: Enable accelerated RFS on vlans

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As far as I know, the hardware doesn't support matching on both IP
fields and vlan tag, but it can at least match on the IP fields.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Andy Lutomirski 2013-05-10 16:51:33 -07:00 committed by Ben Hutchings
parent 62ebac926b
commit 3ea84c5492
1 changed files with 14 additions and 1 deletions
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15
drivers/net/ethernet/sfc/filter.c
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@ -1185,8 +1185,21 @@ int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
nhoff = skb_network_offset(skb);
if (skb->protocol != htons(ETH_P_IP))
if (skb->protocol == htons(ETH_P_8021Q)) {
EFX_BUG_ON_PARANOID(skb_headlen(skb) <
nhoff + sizeof(struct vlan_hdr));
if (((const struct vlan_hdr *)skb->data + nhoff)->
h_vlan_encapsulated_proto != htons(ETH_P_IP))
return -EPROTONOSUPPORT;
/* This is IP over 802.1q VLAN. We can't filter on the
* IP 5-tuple and the vlan together, so just strip the
* vlan header and filter on the IP part.
*/
nhoff += sizeof(struct vlan_hdr);
} else if (skb->protocol != htons(ETH_P_IP)) {
return -EPROTONOSUPPORT;
}
/* RFS must validate the IP header length before calling us */
EFX_BUG_ON_PARANOID(skb_headlen(skb) < nhoff + sizeof(*ip));