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path: root/drivers/net/spider_net.c
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Diffstat (limited to 'drivers/net/spider_net.c')
-rw-r--r--drivers/net/spider_net.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index d779a0b9d456..96b5d00c21da 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -684,6 +684,7 @@ spider_net_prepare_tx_descr(struct spider_net_card *card,
break;
}
+ /* Chain the bus address, so that the DMA engine finds this descr. */
descr->prev->next_descr_addr = descr->bus_addr;
card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
@@ -717,6 +718,41 @@ spider_net_release_tx_descr(struct spider_net_card *card)
dev_kfree_skb_any(skb);
}
+static void
+spider_net_set_low_watermark(struct spider_net_card *card)
+{
+ int status;
+ int cnt=0;
+ int i;
+ struct spider_net_descr *descr = card->tx_chain.tail;
+
+ /* Measure the length of the queue. */
+ while (descr != card->tx_chain.head) {
+ status = descr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
+ if (status == SPIDER_NET_DESCR_NOT_IN_USE)
+ break;
+ descr = descr->next;
+ cnt++;
+ }
+
+ /* If TX queue is short, don't even bother with interrupts */
+ if (cnt < card->tx_desc/4)
+ return;
+
+ /* Set low-watermark 3/4th's of the way into the queue. */
+ descr = card->tx_chain.tail;
+ cnt = (cnt*3)/4;
+ for (i=0;i<cnt; i++)
+ descr = descr->next;
+
+ /* Set the new watermark, clear the old watermark */
+ descr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
+ if (card->low_watermark && card->low_watermark != descr)
+ card->low_watermark->dmac_cmd_status =
+ card->low_watermark->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
+ card->low_watermark = descr;
+}
+
/**
* spider_net_release_tx_chain - processes sent tx descriptors
* @card: adapter structure
@@ -838,6 +874,7 @@ spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
return NETDEV_TX_BUSY;
}
+ spider_net_set_low_watermark(card);
spider_net_kick_tx_dma(card);
card->tx_chain.head = card->tx_chain.head->next;
spin_unlock_irqrestore(&chain->lock, flags);
@@ -1467,6 +1504,10 @@ spider_net_interrupt(int irq, void *ptr)
spider_net_rx_irq_off(card);
netif_rx_schedule(netdev);
}
+ if (status_reg & SPIDER_NET_TXINT ) {
+ spider_net_cleanup_tx_ring(card);
+ netif_wake_queue(netdev);
+ }
if (status_reg & SPIDER_NET_ERRINT )
spider_net_handle_error_irq(card, status_reg);
@@ -1629,6 +1670,8 @@ spider_net_open(struct net_device *netdev)
PCI_DMA_TODEVICE, card->tx_desc))
goto alloc_tx_failed;
+ card->low_watermark = NULL;
+
/* rx_chain is after tx_chain, so offset is descr + tx_count */
if (spider_net_init_chain(card, &card->rx_chain,
card->descr + card->tx_desc,