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Commit 649c5b8b authored by Pravin B Shelar's avatar Pravin B Shelar Committed by David S. Miller
Browse files

vxlan: Improve vxlan headroom calculation. 



Rather than having static headroom calculation, adjust headroom
according to target device.

Signed-off-by: default avatarPravin B Shelar <pshelar@nicira.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 49560532

drivers/net/vxlan.c

+9 −4
Original line number Diff line number Diff line
@@ -1130,6 +1130,7 @@ int vxlan_xmit_skb(struct net *net, struct vxlan_sock *vs, 
{

	struct vxlanhdr *vxh;

	struct udphdr *uh;

	int min_headroom;

	int err;



	if (!skb->encapsulation) {
@@ -1137,6 +1138,14 @@ int vxlan_xmit_skb(struct net *net, struct vxlan_sock *vs, 
		skb->encapsulation = 1;

	}



	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len

			+ VXLAN_HLEN + sizeof(struct iphdr);



	/* Need space for new headers (invalidates iph ptr) */

	err = skb_cow_head(skb, min_headroom);

	if (unlikely(err))

		return err;



	vxh = (struct vxlanhdr *) __skb_push(skb, sizeof(*vxh));

	vxh->vx_flags = htonl(VXLAN_FLAGS);

	vxh->vx_vni = vni;
@@ -1220,10 +1229,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 
		goto drop;

	}



	/* Need space for new headers (invalidates iph ptr) */

	if (skb_cow_head(skb, VXLAN_HEADROOM))

		goto drop;



	old_iph = ip_hdr(skb);



	ttl = vxlan->ttl;