sfc: Enable accelerated RFS on vlans
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>
diff --git a/drivers/net/ethernet/sfc/filter.c b/drivers/net/ethernet/sfc/filter.c
index 2397f0e..b74a60a 100644
--- a/drivers/net/ethernet/sfc/filter.c
+++ b/drivers/net/ethernet/sfc/filter.c
@@ -1185,8 +1185,21 @@
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));