ixgb: don't allow too small MTU
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index 60cad65..0e72dad 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1566,9 +1566,9 @@
int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
-
- if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
- || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
+ /* MTU < 68 is an error for IPv4 traffic, just don't allow it */
+ if ((new_mtu < 68) ||
+ (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
return -EINVAL;
}