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[PATCH] S2io: Support for runtime MTU change 

Hi,
Patch below supports MTU change on-the-fly(without bringing interface
down)

Signed-off-by: Ravinandan Arakali <ravinandan.arakali@neterion.com>
Signed-off-by: Raghavendra Koushik <raghavendra.koushik@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
raghavendra.koushik@neterion.com 2005-08-03 12:33:12 -07:00 committed by Jeff Garzik
parent fe11363832
commit d8892c6ee3
1 changed files with 16 additions and 12 deletions
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28
drivers/net/s2io.c
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@ -2849,6 +2849,7 @@ int s2io_xmit(struct sk_buff *skb, struct net_device *dev)
}
txdp->Control_2 |= config->tx_intr_type;
txdp->Control_1 |= (TXD_BUFFER0_SIZE(frg_len) |
TXD_GATHER_CODE_FIRST);
txdp->Control_1 |= TXD_LIST_OWN_XENA;
@ -4246,14 +4247,6 @@ int s2io_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
int s2io_change_mtu(struct net_device *dev, int new_mtu)
{
nic_t *sp = dev->priv;
XENA_dev_config_t __iomem *bar0 = sp->bar0;
register u64 val64;
if (netif_running(dev)) {
DBG_PRINT(ERR_DBG, "%s: Must be stopped to ", dev->name);
DBG_PRINT(ERR_DBG, "change its MTU\n");
return -EBUSY;
}
if ((new_mtu < MIN_MTU) || (new_mtu > S2IO_JUMBO_SIZE)) {
DBG_PRINT(ERR_DBG, "%s: MTU size is invalid.\n",
@ -4261,11 +4254,22 @@ int s2io_change_mtu(struct net_device *dev, int new_mtu)
return -EPERM;
}
/* Set the new MTU into the PYLD register of the NIC */
val64 = new_mtu;
writeq(vBIT(val64, 2, 14), &bar0->rmac_max_pyld_len);
dev->mtu = new_mtu;
if (netif_running(dev)) {
s2io_card_down(sp);
netif_stop_queue(dev);
if (s2io_card_up(sp)) {
DBG_PRINT(ERR_DBG, "%s: Device bring up failed\n",
__FUNCTION__);
}
if (netif_queue_stopped(dev))
netif_wake_queue(dev);
} else { /* Device is down */
XENA_dev_config_t __iomem *bar0 = sp->bar0;
u64 val64 = new_mtu;
writeq(vBIT(val64, 2, 14), &bar0->rmac_max_pyld_len);
}
return 0;
}