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net/smsc911x.c: Set the VLAN1 register to fix VLAN MTU problem

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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>
This commit is contained in:
Göran Weinholt 2011-03-02 04:07:21 +00:00 committed by David S. Miller
parent 9b3de1ef1b
commit f277e65e7a
1 changed files with 5 additions and 0 deletions
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5
drivers/net/smsc911x.c
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@ -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_) &&