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[PATCH] sky2: transmit recovery

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This patch decodes state and revovers from any races in the transmit
timeout and NAPI logic. It should never trigger, but if it does then
do the right thing.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2006-03-20 15:48:21 -08:00 committed by Jeff Garzik
parent d89e134395
commit 8f24664da6
1 changed files with 31 additions and 6 deletions
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37
drivers/net/sky2.c
View file

@ -1328,7 +1328,7 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done)
}
sky2->tx_cons = put;
if (netif_queue_stopped(dev) && tx_avail(sky2) > MAX_SKB_TX_LE)
if (tx_avail(sky2) > MAX_SKB_TX_LE)
netif_wake_queue(dev);
}
@ -1651,17 +1651,40 @@ static void sky2_tx_timeout(struct net_device *dev)
struct sky2_port *sky2 = netdev_priv(dev);
struct sky2_hw *hw = sky2->hw;
unsigned txq = txqaddr[sky2->port];
u16 report, done;
if (netif_msg_timer(sky2))
printk(KERN_ERR PFX "%s: tx timeout\n", dev->name);
sky2_write32(hw, Q_ADDR(txq, Q_CSR), BMU_STOP);
sky2_write32(hw, Y2_QADDR(txq, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);
report = sky2_read16(hw, sky2->port == 0 ? STAT_TXA1_RIDX : STAT_TXA2_RIDX);
done = sky2_read16(hw, Q_ADDR(txq, Q_DONE));
sky2_tx_clean(sky2);
printk(KERN_DEBUG PFX "%s: transmit ring %u .. %u report=%u done=%u\n",
dev->name,
sky2->tx_cons, sky2->tx_prod, report, done);
sky2_qset(hw, txq);
sky2_prefetch_init(hw, txq, sky2->tx_le_map, TX_RING_SIZE - 1);
if (report != done) {
printk(KERN_INFO PFX "status burst pending (irq moderation?)\n");
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_STOP);
sky2_write8(hw, STAT_TX_TIMER_CTRL, TIM_START);
} else if (report != sky2->tx_cons) {
printk(KERN_INFO PFX "status report lost?\n");
spin_lock_bh(&sky2->tx_lock);
sky2_tx_complete(sky2, report);
spin_unlock_bh(&sky2->tx_lock);
} else {
printk(KERN_INFO PFX "hardware hung? flushing\n");
sky2_write32(hw, Q_ADDR(txq, Q_CSR), BMU_STOP);
sky2_write32(hw, Y2_QADDR(txq, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);
sky2_tx_clean(sky2);
sky2_qset(hw, txq);
sky2_prefetch_init(hw, txq, sky2->tx_le_map, TX_RING_SIZE - 1);
}
}
@ -2097,6 +2120,8 @@ static irqreturn_t sky2_intr(int irq, void *dev_id, struct pt_regs *regs)
prefetch(&hw->st_le[hw->st_idx]);
if (likely(__netif_rx_schedule_prep(dev0)))
__netif_rx_schedule(dev0);
else
printk(KERN_DEBUG PFX "irq race detected\n");
return IRQ_HANDLED;
}