[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>
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ec1248e70e
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@ -2307,16 +2307,13 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
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int i;
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u32 control, len;
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u64 map;
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unsigned long flags;
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skb = skb_padto(skb, ETH_ZLEN);
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if (!skb)
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return NETDEV_TX_OK;
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local_irq_save(flags);
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if (!spin_trylock(&skge->tx_lock)) {
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/* Collision - tell upper layer to requeue */
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local_irq_restore(flags);
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return NETDEV_TX_LOCKED;
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}
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@ -2327,7 +2324,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
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printk(KERN_WARNING PFX "%s: ring full when queue awake!\n",
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dev->name);
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}
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spin_unlock_irqrestore(&skge->tx_lock, flags);
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spin_unlock(&skge->tx_lock);
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return NETDEV_TX_BUSY;
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}
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@ -2403,7 +2400,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
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}
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dev->trans_start = jiffies;
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spin_unlock_irqrestore(&skge->tx_lock, flags);
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spin_unlock(&skge->tx_lock);
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return NETDEV_TX_OK;
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}
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@ -2416,7 +2413,7 @@ static inline void skge_tx_free(struct skge_hw *hw, struct skge_element *e)
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pci_unmap_addr(e, mapaddr),
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pci_unmap_len(e, maplen),
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PCI_DMA_TODEVICE);
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dev_kfree_skb_any(e->skb);
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dev_kfree_skb(e->skb);
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e->skb = NULL;
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} else {
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pci_unmap_page(hw->pdev,
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@ -2430,15 +2427,14 @@ static void skge_tx_clean(struct skge_port *skge)
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{
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struct skge_ring *ring = &skge->tx_ring;
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struct skge_element *e;
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unsigned long flags;
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spin_lock_irqsave(&skge->tx_lock, flags);
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spin_lock_bh(&skge->tx_lock);
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for (e = ring->to_clean; e != ring->to_use; e = e->next) {
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++skge->tx_avail;
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skge_tx_free(skge->hw, e);
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}
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ring->to_clean = e;
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spin_unlock_irqrestore(&skge->tx_lock, flags);
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spin_unlock_bh(&skge->tx_lock);
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}
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static void skge_tx_timeout(struct net_device *dev)
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@ -2663,6 +2659,37 @@ resubmit:
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return NULL;
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}
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static void skge_tx_done(struct skge_port *skge)
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{
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struct skge_ring *ring = &skge->tx_ring;
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struct skge_element *e;
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spin_lock(&skge->tx_lock);
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for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
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struct skge_tx_desc *td = e->desc;
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u32 control;
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rmb();
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control = td->control;
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if (control & BMU_OWN)
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break;
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if (unlikely(netif_msg_tx_done(skge)))
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printk(KERN_DEBUG PFX "%s: tx done slot %td status 0x%x\n",
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skge->netdev->name, e - ring->start, td->status);
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skge_tx_free(skge->hw, e);
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e->skb = NULL;
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++skge->tx_avail;
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}
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ring->to_clean = e;
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skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
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if (skge->tx_avail > MAX_SKB_FRAGS + 1)
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netif_wake_queue(skge->netdev);
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spin_unlock(&skge->tx_lock);
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}
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static int skge_poll(struct net_device *dev, int *budget)
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{
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@ -2670,8 +2697,10 @@ static int skge_poll(struct net_device *dev, int *budget)
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struct skge_hw *hw = skge->hw;
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struct skge_ring *ring = &skge->rx_ring;
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struct skge_element *e;
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unsigned int to_do = min(dev->quota, *budget);
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unsigned int work_done = 0;
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int to_do = min(dev->quota, *budget);
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int work_done = 0;
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skge_tx_done(skge);
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for (e = ring->to_clean; prefetch(e->next), work_done < to_do; e = e->next) {
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struct skge_rx_desc *rd = e->desc;
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@ -2714,40 +2743,6 @@ static int skge_poll(struct net_device *dev, int *budget)
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return 0;
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}
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static inline void skge_tx_intr(struct net_device *dev)
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{
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struct skge_port *skge = netdev_priv(dev);
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struct skge_hw *hw = skge->hw;
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struct skge_ring *ring = &skge->tx_ring;
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struct skge_element *e;
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spin_lock(&skge->tx_lock);
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for (e = ring->to_clean; prefetch(e->next), e != ring->to_use; e = e->next) {
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struct skge_tx_desc *td = e->desc;
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u32 control;
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rmb();
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control = td->control;
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if (control & BMU_OWN)
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break;
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if (unlikely(netif_msg_tx_done(skge)))
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printk(KERN_DEBUG PFX "%s: tx done slot %td status 0x%x\n",
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dev->name, e - ring->start, td->status);
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skge_tx_free(hw, e);
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e->skb = NULL;
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++skge->tx_avail;
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}
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ring->to_clean = e;
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skge_write8(hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_IRQ_CL_F);
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if (skge->tx_avail > MAX_SKB_FRAGS + 1)
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netif_wake_queue(dev);
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spin_unlock(&skge->tx_lock);
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}
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/* Parity errors seem to happen when Genesis is connected to a switch
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* with no other ports present. Heartbeat error??
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*/
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@ -2884,24 +2879,18 @@ static irqreturn_t skge_intr(int irq, void *dev_id, struct pt_regs *regs)
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return IRQ_NONE;
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spin_lock(&hw->hw_lock);
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if (status & IS_R1_F) {
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if (status & (IS_R1_F|IS_XA1_F)) {
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skge_write8(hw, Q_ADDR(Q_R1, Q_CSR), CSR_IRQ_CL_F);
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hw->intr_mask &= ~IS_R1_F;
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hw->intr_mask &= ~(IS_R1_F|IS_XA1_F);
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netif_rx_schedule(hw->dev[0]);
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}
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if (status & IS_R2_F) {
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if (status & (IS_R2_F|IS_XA2_F)) {
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skge_write8(hw, Q_ADDR(Q_R2, Q_CSR), CSR_IRQ_CL_F);
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hw->intr_mask &= ~IS_R2_F;
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hw->intr_mask &= ~(IS_R2_F|IS_XA2_F);
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netif_rx_schedule(hw->dev[1]);
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}
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if (status & IS_XA1_F)
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skge_tx_intr(hw->dev[0]);
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if (status & IS_XA2_F)
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skge_tx_intr(hw->dev[1]);
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if (status & IS_PA_TO_RX1) {
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struct skge_port *skge = netdev_priv(hw->dev[0]);
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++skge->net_stats.rx_over_errors;
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