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e1000e: Correctly include VLAN_HLEN when changing interface MTU 

When changing the interface mtu, the driver starts with a value
that doesn't include VLAN_HLEN.  Later tests in the driver
set the rx_buffer_len based on the mtu.  As a result, when
the user increases the mtu to 1504 (to support 802.1AD for example),
the driver rx_buffer_len does not change and frames longer
the 1522 bytes are rejected as too long.

Include VLAN_HLEN from the start so that an user mtu greater then
1500 bytes is correctly reflected in the driver rx_buffer_len.

CC: e1000-devel@lists.sourceforge.net
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Vlad Yasevich 2014-04-05 06:25:26 +00:00 committed by Jeff Kirsher
parent 059dab6965
commit c751a3d58c
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -5687,7 +5687,7 @@ struct rtnl_link_stats64 *e1000e_get_stats64(struct net_device *netdev,
static int e1000_change_mtu(struct net_device *netdev, int new_mtu)
{
struct e1000_adapter *adapter = netdev_priv(netdev);
int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
int max_frame = new_mtu + VLAN_HLEN + ETH_HLEN + ETH_FCS_LEN;
/* Jumbo frame support */
if ((max_frame > ETH_FRAME_LEN + ETH_FCS_LEN) &&