From af2a58acb12f6b19e6f04b730203e199abedc44a Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Fri, 9 Dec 2005 11:35:04 -0800 Subject: [PATCH] [PATCH] sky2: transmit complete routine optimization Hand optimize transmit completion routine. Signed-off-by: Stephen Hemminger Signed-off-by: Jeff Garzik --- drivers/net/sky2.c | 35 ++++++++++++++++------------------- 1 file changed, 16 insertions(+), 19 deletions(-) diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index ff6557dd07..21aeb0c91f 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -1227,6 +1227,8 @@ out_unlock: static void sky2_tx_complete(struct sky2_port *sky2, u16 done) { struct net_device *dev = sky2->netdev; + struct pci_dev *pdev = sky2->hw->pdev; + u16 nxt, put; unsigned i; BUG_ON(done >= TX_RING_SIZE); @@ -1235,39 +1237,34 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done) printk(KERN_DEBUG "%s: tx done, up to %u\n", dev->name, done); - spin_lock(&sky2->tx_lock); + for (put = sky2->tx_cons; put != done; put = nxt) { + struct tx_ring_info *re = sky2->tx_ring + put; + struct sk_buff *skb = re->skb; - while (sky2->tx_cons != done) { - struct tx_ring_info *re = sky2->tx_ring + sky2->tx_cons; - struct sk_buff *skb; + nxt = re->idx; + BUG_ON(nxt >= TX_RING_SIZE); /* Check for partial status */ - if (tx_dist(sky2->tx_cons, done) - < tx_dist(sky2->tx_cons, re->idx)) - goto out; + if (tx_dist(put, done) < tx_dist(put, nxt)) + break; skb = re->skb; - pci_unmap_single(sky2->hw->pdev, - pci_unmap_addr(re, mapaddr), + pci_unmap_single(pdev, pci_unmap_addr(re, mapaddr), skb_headlen(skb), PCI_DMA_TODEVICE); for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { struct tx_ring_info *fre; - fre = - sky2->tx_ring + (sky2->tx_cons + i + - 1) % TX_RING_SIZE; - pci_unmap_page(sky2->hw->pdev, - pci_unmap_addr(fre, mapaddr), - skb_shinfo(skb)->frags[i].size, + fre = sky2->tx_ring + (put + i + 1) % TX_RING_SIZE; + pci_unmap_page(pdev, pci_unmap_addr(fre, mapaddr), + skb_shinfo(skb)->frags[i].size, PCI_DMA_TODEVICE); } dev_kfree_skb_any(skb); - - sky2->tx_cons = re->idx; } -out: + spin_lock(&sky2->tx_lock); + sky2->tx_cons = put; if (netif_queue_stopped(dev) && tx_avail(sky2) > MAX_SKB_TX_LE) netif_wake_queue(dev); spin_unlock(&sky2->tx_lock); @@ -1742,7 +1739,7 @@ static int sky2_poll(struct net_device *dev0, int *budget) sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ); hwidx = sky2_read16(hw, STAT_PUT_IDX); BUG_ON(hwidx >= STATUS_RING_SIZE); - rmb(); + rmb(); while (hwidx != hw->st_idx) { struct sky2_status_le *le = hw->st_le + hw->st_idx; -- 2.39.5