vxlan: Add tx-vlan offload support.

Following patch allows transmit side vlan offload for vxlan
devices.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 73e2557..b9401b5 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -27,6 +27,7 @@
 #include <linux/igmp.h>
 #include <linux/etherdevice.h>
 #include <linux/if_ether.h>
+#include <linux/if_vlan.h>
 #include <linux/hash.h>
 #include <linux/ethtool.h>
 #include <net/arp.h>
@@ -1139,13 +1140,23 @@ int vxlan_xmit_skb(struct net *net, struct vxlan_sock *vs,
        }
 
        min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
-                       + VXLAN_HLEN + sizeof(struct iphdr);
+                       + VXLAN_HLEN + sizeof(struct iphdr)
+                       + (vlan_tx_tag_present(skb) ? VLAN_HLEN : 0);
 
        /* Need space for new headers (invalidates iph ptr) */
        err = skb_cow_head(skb, min_headroom);
        if (unlikely(err))
                return err;
 
+       if (vlan_tx_tag_present(skb)) {
+               if (WARN_ON(!__vlan_put_tag(skb,
+                                           skb->vlan_proto,
+                                           vlan_tx_tag_get(skb))))
+                       return -ENOMEM;
+
+               skb->vlan_tci = 0;
+       }
+
        vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));
        vxh->vx_flags = htonl(VXLAN_FLAGS);
        vxh->vx_vni = vni;
@@ -1560,8 +1571,11 @@ static void vxlan_setup(struct net_device *dev)
        dev->features   |= NETIF_F_RXCSUM;
        dev->features   |= NETIF_F_GSO_SOFTWARE;
 
+       dev->vlan_features = dev->features;
+       dev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
        dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
        dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+       dev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
        dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
        dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;