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[PATCH] natsemi: NAPI and a bugfix
As documented in National application note 1287 the RX state machine on the natsemi chip can lock up under some conditions (mostly related to heavy load). When this happens a series of bogus packets are reported by the chip including some oversized frames prior to the final lockup. This patch implements the fix from the application note: when an oversized packet is reported it resets the RX state machine, dropping any currently pending packets. Signed-off-by: Mark Brown <broonie@sirena.org.uk> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -1498,6 +1498,31 @@ static void natsemi_reset(struct net_device *dev)
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writel(rfcr, ioaddr + RxFilterAddr);
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}
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static void reset_rx(struct net_device *dev)
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{
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int i;
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struct netdev_private *np = netdev_priv(dev);
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void __iomem *ioaddr = ns_ioaddr(dev);
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np->intr_status &= ~RxResetDone;
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writel(RxReset, ioaddr + ChipCmd);
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for (i=0;i<NATSEMI_HW_TIMEOUT;i++) {
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np->intr_status |= readl(ioaddr + IntrStatus);
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if (np->intr_status & RxResetDone)
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break;
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udelay(15);
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}
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if (i==NATSEMI_HW_TIMEOUT) {
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printk(KERN_WARNING "%s: RX reset did not complete in %d usec.\n",
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dev->name, i*15);
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} else if (netif_msg_hw(np)) {
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printk(KERN_WARNING "%s: RX reset took %d usec.\n",
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dev->name, i*15);
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}
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}
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static void natsemi_reload_eeprom(struct net_device *dev)
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{
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struct netdev_private *np = netdev_priv(dev);
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@ -2292,6 +2317,23 @@ static void netdev_rx(struct net_device *dev, int *work_done, int work_to_do)
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"status %#08x.\n", dev->name,
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np->cur_rx, desc_status);
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np->stats.rx_length_errors++;
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/* The RX state machine has probably
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* locked up beneath us. Follow the
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* reset procedure documented in
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* AN-1287. */
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spin_lock_irq(&np->lock);
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reset_rx(dev);
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reinit_rx(dev);
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writel(np->ring_dma, ioaddr + RxRingPtr);
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check_link(dev);
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spin_unlock_irq(&np->lock);
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/* We'll enable RX on exit from this
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* function. */
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break;
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} else {
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/* There was an error. */
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np->stats.rx_errors++;
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