From 29b4e886cbba5e0b0e4379fea7fc313e7808b5c2 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 23 Mar 2006 11:07:28 -0800 Subject: [PATCH] skge: compute available ring buffers Don't need to keep track of available buffers, it is simpler to just compute the value (ala e1000). Don't need tes on link up because should always have available buffers then. Signed-off-by: Stephen Hemminger Signed-off-by: Jeff Garzik --- drivers/net/skge.c | 20 ++++++++++---------- drivers/net/skge.h | 1 - 2 files changed, 10 insertions(+), 11 deletions(-) diff --git a/drivers/net/skge.c b/drivers/net/skge.c index a261766..a6f42fc8 100644 --- a/drivers/net/skge.c +++ b/drivers/net/skge.c @@ -847,8 +847,7 @@ static void skge_link_up(struct skge_port *skge) LED_BLK_OFF|LED_SYNC_OFF|LED_ON); netif_carrier_on(skge->netdev); - if (skge->tx_avail > MAX_SKB_FRAGS + 1) - netif_wake_queue(skge->netdev); + netif_wake_queue(skge->netdev); if (netif_msg_link(skge)) printk(KERN_INFO PFX @@ -2190,8 +2189,6 @@ static int skge_up(struct net_device *dev) if (err) goto free_rx_ring; - skge->tx_avail = skge->tx_ring.count - 1; - /* Initialize MAC */ spin_lock_bh(&hw->phy_lock); if (hw->chip_id == CHIP_ID_GENESIS) @@ -2294,6 +2291,12 @@ static int skge_down(struct net_device *dev) return 0; } +static inline int skge_avail(const struct skge_ring *ring) +{ + return ((ring->to_clean > ring->to_use) ? 0 : ring->count) + + (ring->to_clean - ring->to_use) - 1; +} + static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev) { struct skge_port *skge = netdev_priv(dev); @@ -2314,7 +2317,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_LOCKED; } - if (unlikely(skge->tx_avail < skb_shinfo(skb)->nr_frags +1)) { + if (unlikely(skge_avail(&skge->tx_ring) < skb_shinfo(skb)->nr_frags + 1)) { if (!netif_queue_stopped(dev)) { netif_stop_queue(dev); @@ -2390,8 +2393,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev) dev->name, e - ring->start, skb->len); ring->to_use = e->next; - skge->tx_avail -= skb_shinfo(skb)->nr_frags + 1; - if (skge->tx_avail <= MAX_SKB_FRAGS + 1) { + if (skge_avail(&skge->tx_ring) <= MAX_SKB_FRAGS + 1) { pr_debug("%s: transmit queue full\n", dev->name); netif_stop_queue(dev); } @@ -2416,14 +2418,12 @@ static void skge_tx_complete(struct skge_port *skge, struct skge_element *last) e->skb = NULL; pci_unmap_single(pdev, pci_unmap_addr(e, mapaddr), skb_headlen(skb), PCI_DMA_TODEVICE); - ++skge->tx_avail; for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { e = e->next; pci_unmap_page(pdev, pci_unmap_addr(e, mapaddr), skb_shinfo(skb)->frags[i].size, PCI_DMA_TODEVICE); - ++skge->tx_avail; } dev_kfree_skb(skb); @@ -2688,7 +2688,7 @@ static void skge_tx_done(struct skge_port *skge) skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F); - if (skge->tx_avail > MAX_SKB_FRAGS + 1) + if (skge_avail(&skge->tx_ring) > MAX_SKB_FRAGS + 1) netif_wake_queue(skge->netdev); spin_unlock(&skge->tx_lock); diff --git a/drivers/net/skge.h b/drivers/net/skge.h index 2efdacc..1f1ce88 100644 --- a/drivers/net/skge.h +++ b/drivers/net/skge.h @@ -2418,7 +2418,6 @@ struct skge_port { int port; spinlock_t tx_lock; - u32 tx_avail; struct skge_ring tx_ring; struct skge_ring rx_ring; -- cgit v1.1