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authorGöran Weinholt <weinholt@csbnet.se>2011-03-02 04:07:21 +0000
committerDavid S. Miller <davem@davemloft.net>2011-03-07 12:30:12 -0800
commitf277e65e7a2d360189f760baca42f3ca2f62dd7a (patch)
tree6d6cdfe42ad1b7b687ed18d870db95af4982bd1b /drivers/net/smsc911x.c
parent9b3de1ef1ba0aa1129a9f857f07a6a97d954c6fd (diff)
net/smsc911x.c: Set the VLAN1 register to fix VLAN MTU problem
The smsc911x driver would drop frames longer than 1518 bytes, which is a problem for networks with VLAN tagging. The VLAN1 tag register is used to increase the legal frame size to 1522 when a VLAN tag is identified. Signed-off-by: Göran Weinholt <weinholt@csbnet.se> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/smsc911x.c')
-rw-r--r--drivers/net/smsc911x.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index 64bfdae5956f..d70bde95460b 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -1178,6 +1178,11 @@ static int smsc911x_open(struct net_device *dev)
smsc911x_reg_write(pdata, HW_CFG, 0x00050000);
smsc911x_reg_write(pdata, AFC_CFG, 0x006E3740);
+ /* Increase the legal frame size of VLAN tagged frames to 1522 bytes */
+ spin_lock_irq(&pdata->mac_lock);
+ smsc911x_mac_write(pdata, VLAN1, ETH_P_8021Q);
+ spin_unlock_irq(&pdata->mac_lock);
+
/* Make sure EEPROM has finished loading before setting GPIO_CFG */
timeout = 50;
while ((smsc911x_reg_read(pdata, E2P_CMD) & E2P_CMD_EPC_BUSY_) &&