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forcedeth: tx timeout fix

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This patch fixes the tx_timeout() to properly handle the clean up of the
tx ring. It also sets the tx put pointer back to the correct position to
be in sync with HW.

Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ayaz Abdulla 2009-04-25 09:17:56 +00:00 committed by David S. Miller
parent c759a6b4e1
commit 8f955d7f04
1 changed files with 21 additions and 10 deletions
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31
drivers/net/forcedeth.c
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@ -1880,6 +1880,7 @@ static void nv_init_tx(struct net_device *dev)
np->tx_pkts_in_progress = 0;
np->tx_change_owner = NULL;
np->tx_end_flip = NULL;
np->tx_stop = 0;
for (i = 0; i < np->tx_ring_size; i++) {
if (!nv_optimized(np)) {
@ -2530,6 +2531,8 @@ static void nv_tx_timeout(struct net_device *dev)
struct fe_priv *np = netdev_priv(dev);
u8 __iomem *base = get_hwbase(dev);
u32 status;
union ring_type put_tx;
int saved_tx_limit;
if (np->msi_flags & NV_MSI_X_ENABLED)
status = readl(base + NvRegMSIXIrqStatus) & NVREG_IRQSTAT_MASK;
@ -2589,24 +2592,32 @@ static void nv_tx_timeout(struct net_device *dev)
/* 1) stop tx engine */
nv_stop_tx(dev);
/* 2) check that the packets were not sent already: */
/* 2) complete any outstanding tx and do not give HW any limited tx pkts */
saved_tx_limit = np->tx_limit;
np->tx_limit = 0; /* prevent giving HW any limited pkts */
np->tx_stop = 0; /* prevent waking tx queue */
if (!nv_optimized(np))
nv_tx_done(dev, np->tx_ring_size);
else
nv_tx_done_optimized(dev, np->tx_ring_size);
/* 3) if there are dead entries: clear everything */
if (np->get_tx_ctx != np->put_tx_ctx) {
printk(KERN_DEBUG "%s: tx_timeout: dead entries!\n", dev->name);
nv_drain_tx(dev);
nv_init_tx(dev);
setup_hw_rings(dev, NV_SETUP_TX_RING);
}
/* save current HW postion */
if (np->tx_change_owner)
put_tx.ex = np->tx_change_owner->first_tx_desc;
else
put_tx = np->put_tx;
netif_wake_queue(dev);
/* 3) clear all tx state */
nv_drain_tx(dev);
nv_init_tx(dev);
/* 4) restart tx engine */
/* 4) restore state to current HW position */
np->get_tx = np->put_tx = put_tx;
np->tx_limit = saved_tx_limit;
/* 5) restart tx engine */
nv_start_tx(dev);
netif_wake_queue(dev);
spin_unlock_irq(&np->lock);
}