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ixgb: don't allow too small MTU

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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>
This commit is contained in:
Jesse Brandeburg 2008-07-08 15:51:32 -07:00 committed by Jeff Garzik
parent 72ab51954d
commit a65a604a01
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ixgb/ixgb_main.c
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@ -1566,9 +1566,9 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu)
int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
/* MTU < 68 is an error for IPv4 traffic, just don't allow it */
if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) if ((new_mtu < 68) ||
|| (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu); DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
return -EINVAL; return -EINVAL;
} }