netdev - [PATCH 5/7] e1000e: increase minimum frame size allowed

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Message-ID: <20080809013606.23913.73166.stgit@localhost.localdomain>
Date:	Fri, 08 Aug 2008 18:36:06 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	akpm@...ux-foundation.org, Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH 5/7] e1000e: increase minimum frame size allowed

From: Bruce Allan <bruce.w.allan@...el.com>

Setting an MTU value below 68 was disabling the network connection and
would not reconnect until the driver was reloaded.  Prevent changing the
MTU to anything below 68.

Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/e1000e/netdev.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 4573c7b..b8b26cf 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -3724,7 +3724,7 @@ 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;
 
-	if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
+	if ((new_mtu < ETH_ZLEN + ETH_FCS_LEN + VLAN_HLEN) ||
 	    (max_frame > MAX_JUMBO_FRAME_SIZE)) {
 		e_err("Invalid MTU setting\n");
 		return -EINVAL;

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