diff mbox

[vxlan,v2,6/8] vxlan: Improve vxlan headroom calculation.

Message ID 1372277636-17662-1-git-send-email-pshelar@nicira.com
State Awaiting Upstream, archived
Delegated to: David Miller
Headers show

Commit Message

Pravin B Shelar June 26, 2013, 8:13 p.m. UTC 
Rather than having static headroom calculation, adjust headroom
according to target device.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
---
 drivers/net/vxlan.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)
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Patch

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index d642d4d..0125c57 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1069,6 +1069,7 @@  int vxlan_xmit_skb(struct net *net, struct vxlan_handler *vh,
 {
 	struct vxlanhdr *vxh;
 	struct udphdr *uh;
+	int min_headroom;
 	int err;
 
 	if (!skb->encapsulation) {
@@ -1076,6 +1077,14 @@  int vxlan_xmit_skb(struct net *net, struct vxlan_handler *vh,
 		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;
@@ -1159,10 +1168,6 @@  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;