[PATCH] skge: use NAPI for tx cleanup.

Cleanup transmit buffers using NAPI.  This allows the transmit routine
to leave interrupts enabled, and that improves performance.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 25e028b7ce48052d22f0366b998974bfdf413ca9..1a30d5401c480f76bf2ee12a30f987551bd9c143 100644 (file)
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -2307,16 +2307,13 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
        int i;
        u32 control, len;
        u64 map;
-       unsigned long flags;
 
        skb = skb_padto(skb, ETH_ZLEN);
        if (!skb)
                return NETDEV_TX_OK;
 
-       local_irq_save(flags);
        if (!spin_trylock(&skge->tx_lock)) {
                /* Collision - tell upper layer to requeue */
-               local_irq_restore(flags);
                return NETDEV_TX_LOCKED;
        }
 
@@ -2327,7 +2324,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
                        printk(KERN_WARNING PFX "%s: ring full when queue awake!\n",
                               dev->name);
                }
-               spin_unlock_irqrestore(&skge->tx_lock, flags);
+               spin_unlock(&skge->tx_lock);
                return NETDEV_TX_BUSY;
        }
 
@@ -2403,7 +2400,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
        }
 
        dev->trans_start = jiffies;
-       spin_unlock_irqrestore(&skge->tx_lock, flags);
+       spin_unlock(&skge->tx_lock);
 
        return NETDEV_TX_OK;
 }
@@ -2416,7 +2413,7 @@ static inline void skge_tx_free(struct skge_hw *hw, struct skge_element *e)
                               pci_unmap_addr(e, mapaddr),
                               pci_unmap_len(e, maplen),
                               PCI_DMA_TODEVICE);
-               dev_kfree_skb_any(e->skb);
+               dev_kfree_skb(e->skb);
                e->skb = NULL;
        } else {
                pci_unmap_page(hw->pdev,
@@ -2430,15 +2427,14 @@ static void skge_tx_clean(struct skge_port *skge)
 {
        struct skge_ring *ring = &skge->tx_ring;
        struct skge_element *e;
-       unsigned long flags;
 
-       spin_lock_irqsave(&skge->tx_lock, flags);
+       spin_lock_bh(&skge->tx_lock);
        for (e = ring->to_clean; e != ring->to_use; e = e->next) {
                ++skge->tx_avail;
                skge_tx_free(skge->hw, e);
        }
        ring->to_clean = e;
-       spin_unlock_irqrestore(&skge->tx_lock, flags);
+       spin_unlock_bh(&skge->tx_lock);
 }
 
 static void skge_tx_timeout(struct net_device *dev)
@@ -2663,6 +2659,37 @@ resubmit:
        return NULL;
 }
 
+static void skge_tx_done(struct skge_port *skge)
+{
+       struct skge_ring *ring = &skge->tx_ring;
+       struct skge_element *e;
+
+       spin_lock(&skge->tx_lock);
+       for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
+               struct skge_tx_desc *td = e->desc;
+               u32 control;
+
+               rmb();
+               control = td->control;
+               if (control & BMU_OWN)
+                       break;
+
+               if (unlikely(netif_msg_tx_done(skge)))
+                       printk(KERN_DEBUG PFX "%s: tx done slot %td status 0x%x\n",
+                              skge->netdev->name, e - ring->start, td->status);
+
+               skge_tx_free(skge->hw, e);
+               e->skb = NULL;
+               ++skge->tx_avail;
+       }
+       ring->to_clean = e;
+       skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
+
+       if (skge->tx_avail > MAX_SKB_FRAGS + 1)
+               netif_wake_queue(skge->netdev);
+
+       spin_unlock(&skge->tx_lock);
+}
 
 static int skge_poll(struct net_device *dev, int *budget)
 {
@@ -2670,8 +2697,10 @@ static int skge_poll(struct net_device *dev, int *budget)
        struct skge_hw *hw = skge->hw;
        struct skge_ring *ring = &skge->rx_ring;
        struct skge_element *e;
-       unsigned int to_do = min(dev->quota, *budget);
-       unsigned int work_done = 0;
+       int to_do = min(dev->quota, *budget);
+       int work_done = 0;
+
+       skge_tx_done(skge);
 
        for (e = ring->to_clean; prefetch(e->next), work_done < to_do; e = e->next) {
                struct skge_rx_desc *rd = e->desc;
@@ -2714,40 +2743,6 @@ static int skge_poll(struct net_device *dev, int *budget)
        return 0;
 }
 
-static inline void skge_tx_intr(struct net_device *dev)
-{
-       struct skge_port *skge = netdev_priv(dev);
-       struct skge_hw *hw = skge->hw;
-       struct skge_ring *ring = &skge->tx_ring;
-       struct skge_element *e;
-
-       spin_lock(&skge->tx_lock);
-       for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
-               struct skge_tx_desc *td = e->desc;
-               u32 control;
-
-               rmb();
-               control = td->control;
-               if (control & BMU_OWN)
-                       break;
-
-               if (unlikely(netif_msg_tx_done(skge)))
-                       printk(KERN_DEBUG PFX "%s: tx done slot %td status 0x%x\n",
-                              dev->name, e - ring->start, td->status);
-
-               skge_tx_free(hw, e);
-               e->skb = NULL;
-               ++skge->tx_avail;
-       }
-       ring->to_clean = e;
-       skge_write8(hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
-
-       if (skge->tx_avail > MAX_SKB_FRAGS + 1)
-               netif_wake_queue(dev);
-
-       spin_unlock(&skge->tx_lock);
-}
-
 /* Parity errors seem to happen when Genesis is connected to a switch
  * with no other ports present. Heartbeat error??
  */
@@ -2884,24 +2879,18 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
                return IRQ_NONE;
 
        spin_lock(&hw->hw_lock);
-       if (status & IS_R1_F) {
+       if (status & (IS_R1_F|IS_XA1_F)) {
                skge_write8(hw, Q_ADDR(Q_R1, Q_CSR), CSR_IRQ_CL_F);
-               hw->intr_mask &= ~IS_R1_F;
+               hw->intr_mask &= ~(IS_R1_F|IS_XA1_F);
                netif_rx_schedule(hw->dev[0]);
        }
 
-       if (status & IS_R2_F) {
+       if (status & (IS_R2_F|IS_XA2_F)) {
                skge_write8(hw, Q_ADDR(Q_R2, Q_CSR), CSR_IRQ_CL_F);
-               hw->intr_mask &= ~IS_R2_F;
+               hw->intr_mask &= ~(IS_R2_F|IS_XA2_F);
                netif_rx_schedule(hw->dev[1]);
        }
 
-       if (status & IS_XA1_F)
-               skge_tx_intr(hw->dev[0]);
-
-       if (status & IS_XA2_F)
-               skge_tx_intr(hw->dev[1]);
-
        if (status & IS_PA_TO_RX1) {
                struct skge_port *skge = netdev_priv(hw->dev[0]);
                ++skge->net_stats.rx_over_errors;