netdev - [PATCH] vxlan: Update hard_header_len based on lowerdev when instantiating VXLAN

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Message-ID: <20121113230955.16102.62399.stgit@ahduyck-cp1.jf.intel.com>
Date:	Tue, 13 Nov 2012 15:10:59 -0800
From:	Alexander Duyck <alexander.h.duyck@...el.com>
To:	netdev@...r.kernel.org
Cc:	shemminger@...tta.com, davem@...emloft.net
Subject: [PATCH] vxlan: Update hard_header_len based on lowerdev when
 instantiating VXLAN

In the event of a VXLAN device being linked to a device that has a
hard_header_len greater than that of standard ethernet we could end up with
the hard_header_len not being large enough for outgoing frames.  In order to
prevent this we should update the length when a lowerdev is provided.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---

 drivers/net/vxlan.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 44bcc20..6b666eb 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1110,6 +1110,10 @@ static int vxlan_newlink(struct net *net, struct net_device *dev,
 
 		if (!tb[IFLA_MTU])
 			dev->mtu = lowerdev->mtu - VXLAN_HEADROOM;
+
+		/* update header length based on lower device */
+		dev->hard_header_len = lowerdev->hard_header_len +
+				       VXLAN_HEADROOM;
 	}
 
 	if (data[IFLA_VXLAN_TOS])

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