From: Pravin B Shelar <pshelar@nicira.com>
To: netdev@vger.kernel.org
Cc: stephen@networkplumber.org, Pravin B Shelar <pshelar@nicira.com>
Subject: [PATCH net-next v2 4/6] vxlan: Improve vxlan headroom calculation.
Date: Tue, 23 Jul 2013 11:22:45 -0700 [thread overview]
Message-ID: <1374603765-15529-1-git-send-email-pshelar@nicira.com> (raw)
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(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 816ce9e..1ca7ca3 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1067,6 +1067,7 @@ 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) {
@@ -1074,6 +1075,14 @@ 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;
@@ -1157,10 +1166,6 @@ 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;
--
1.7.1
reply other threads:[~2013-07-23 18:22 UTC|newest]
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