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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-11-09 13:35:24 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-13 14:36:50 -0500
commit52b702ffa509595c5d04a1a1d0f63acf92b4789b (patch)
tree80303edb068697a49d4936575e3b2c49e8d1976e /drivers
parentbd090dfc634ddd711a5fbd0cadc6e0ab4977bcaf (diff)
vxlan: Fix error that was resulting in VXLAN MTU size being 10 bytes too large
This change fixes an issue I found where VXLAN frames were fragmented when they were up to the VXLAN MTU size. I root caused the issue to the fact that the headroom was 4 + 20 + 8 + 8. This math doesn't appear to be correct because we are not inserting a VLAN header, but instead a 2nd Ethernet header. As such the math for the overhead should be 20 + 8 + 8 + 14 to account for the extra headers that are inserted for VXLAN. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/vxlan.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 7b4adde93c0..0c4d0f49ab4 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -50,8 +50,8 @@
#define VXLAN_N_VID (1u << 24)
#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
-/* VLAN + IP header + UDP + VXLAN */
-#define VXLAN_HEADROOM (4 + 20 + 8 + 8)
+/* IP header + UDP + VXLAN + Ethernet header */
+#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
#define VXLAN_FLAGS 0x08000000 /* struct vxlanhdr.vx_flags required value. */