netdev - [net 3/7] e1000e: Correctly include VLAN_HLEN when changing interface MTU

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Date:	Fri, 18 Apr 2014 18:59:23 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Vlad Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	e1000-devel@...ts.sourceforge.net,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net 3/7] e1000e: Correctly include VLAN_HLEN when changing interface MTU

From: Vlad Yasevich <vyasevic@...hat.com>

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@...ts.sourceforge.net
Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index d50c91e..165f7bc 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -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) &&
-- 
1.9.0

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