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skge: MTU changing fix

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The code to change MTU doesn't correctly handle all the chip variations
and requirements for restarting.  On Genesis chips changing MTU would just
cause receiver to hang.
Use a simpler approach of just taking link down/up if needed.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2007-11-28 14:25:05 -08:00 committed by Jeff Garzik
parent 44c7fccec4
commit 1a8098be98
1 changed files with 2 additions and 33 deletions
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35
drivers/net/skge.c
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@ -2896,11 +2896,7 @@ static void skge_tx_timeout(struct net_device *dev)
static int skge_change_mtu(struct net_device *dev, int new_mtu)
{
struct skge_port *skge = netdev_priv(dev);
struct skge_hw *hw = skge->hw;
int port = skge->port;
int err;
u16 ctl, reg;
if (new_mtu < ETH_ZLEN || new_mtu > ETH_JUMBO_MTU)
return -EINVAL;
@ -2910,40 +2906,13 @@ static int skge_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
skge_write32(hw, B0_IMSK, 0);
dev->trans_start = jiffies; /* prevent tx timeout */
netif_stop_queue(dev);
napi_disable(&skge->napi);
ctl = gma_read16(hw, port, GM_GP_CTRL);
gma_write16(hw, port, GM_GP_CTRL, ctl & ~GM_GPCR_RX_ENA);
skge_rx_clean(skge);
skge_rx_stop(hw, port);
skge_down(dev);
dev->mtu = new_mtu;
reg = GM_SMOD_VLAN_ENA | IPG_DATA_VAL(IPG_DATA_DEF);
if (new_mtu > 1500)
reg |= GM_SMOD_JUMBO_ENA;
gma_write16(hw, port, GM_SERIAL_MODE, reg);
skge_write8(hw, RB_ADDR(rxqaddr[port], RB_CTRL), RB_ENA_OP_MD);
err = skge_rx_fill(dev);
wmb();
if (!err)
skge_write8(hw, Q_ADDR(rxqaddr[port], Q_CSR), CSR_START | CSR_IRQ_CL_F);
skge_write32(hw, B0_IMSK, hw->intr_mask);
err = skge_up(dev);
if (err)
dev_close(dev);
else {
gma_write16(hw, port, GM_GP_CTRL, ctl);
napi_enable(&skge->napi);
netif_wake_queue(dev);
}
return err;
}