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Commit 2bb8c262 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
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[PATCH] sky2: use netif_tx_lock instead of LLTX 



Use the netdevice transmit lock via netif_tx_lock rather than putting
lock in device specific code and using lockless transmit.  The code is
cleaner using netif_tx_lock, and the performance is same.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 291ea614

drivers/net/sky2.c

+17 −40
Original line number Diff line number Diff line
@@ -942,13 +942,13 @@ static void sky2_vlan_rx_register(struct net_device *dev, struct vlan_group *grp 
	struct sky2_hw *hw = sky2->hw;

	u16 port = sky2->port;



	spin_lock_bh(&sky2->tx_lock);

	netif_tx_lock_bh(dev);



	sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T), RX_VLAN_STRIP_ON);

	sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_VLAN_TAG_ON);

	sky2->vlgrp = grp;



	spin_unlock_bh(&sky2->tx_lock);

	netif_tx_unlock_bh(dev);

}



static void sky2_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
@@ -957,14 +957,14 @@ static void sky2_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid) 
	struct sky2_hw *hw = sky2->hw;

	u16 port = sky2->port;



	spin_lock_bh(&sky2->tx_lock);

	netif_tx_lock_bh(dev);



	sky2_write32(hw, SK_REG(port, RX_GMF_CTRL_T), RX_VLAN_STRIP_OFF);

	sky2_write32(hw, SK_REG(port, TX_GMF_CTRL_T), TX_VLAN_TAG_OFF);

	if (sky2->vlgrp)

		sky2->vlgrp->vlan_devices[vid] = NULL;



	spin_unlock_bh(&sky2->tx_lock);

	netif_tx_unlock_bh(dev);

}

#endif
@@ -1202,8 +1202,6 @@ static unsigned tx_le_req(const struct sk_buff *skb) 
 * A single packet can generate multiple list elements, and

 * the number of ring elements will probably be less than the number

 * of list elements used.

 *

 * No BH disabling for tx_lock here (like tg3)

 */

static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)

{
@@ -1217,27 +1215,8 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev) 
	u16 mss;

	u8 ctrl;



	/* No BH disabling for tx_lock here.  We are running in BH disabled

	 * context and TX reclaim runs via poll inside of a software

	 * interrupt, and no related locks in IRQ processing.

	 */

	if (!spin_trylock(&sky2->tx_lock))

		return NETDEV_TX_LOCKED;



	if (unlikely(tx_avail(sky2) < tx_le_req(skb))) {

		/* There is a known but harmless race with lockless tx

		 * and netif_stop_queue.

		 */

		if (!netif_queue_stopped(dev)) {

			netif_stop_queue(dev);

			if (net_ratelimit())

				printk(KERN_WARNING PFX "%s: ring full when queue awake!\n",

				       dev->name);

		}

		spin_unlock(&sky2->tx_lock);



 	if (unlikely(tx_avail(sky2) < tx_le_req(skb)))

  		return NETDEV_TX_BUSY;

	}



	if (unlikely(netif_msg_tx_queued(sky2)))

		printk(KERN_DEBUG "%s: tx queued, slot %u, len %d\n",
@@ -1352,8 +1331,6 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev) 


	sky2_put_idx(hw, txqaddr[sky2->port], sky2->tx_prod);



	spin_unlock(&sky2->tx_lock);



	dev->trans_start = jiffies;

	return NETDEV_TX_OK;

}
@@ -1408,11 +1385,13 @@ static void sky2_tx_complete(struct sky2_port *sky2, u16 done) 
}



/* Cleanup all untransmitted buffers, assume transmitter not running */

static void sky2_tx_clean(struct sky2_port *sky2)

static void sky2_tx_clean(struct net_device *dev)

{

	spin_lock_bh(&sky2->tx_lock);

	struct sky2_port *sky2 = netdev_priv(dev);



	netif_tx_lock_bh(dev);

	sky2_tx_complete(sky2, sky2->tx_prod);

	spin_unlock_bh(&sky2->tx_lock);

	netif_tx_unlock_bh(dev);

}



/* Network shutdown */
@@ -1496,7 +1475,7 @@ static int sky2_down(struct net_device *dev) 


	synchronize_irq(hw->pdev->irq);



	sky2_tx_clean(sky2);

	sky2_tx_clean(dev);

	sky2_rx_clean(sky2);



	pci_free_consistent(hw->pdev, RX_LE_BYTES,
@@ -1748,16 +1727,16 @@ static void sky2_tx_timeout(struct net_device *dev) 
	} else if (report != sky2->tx_cons) {

		printk(KERN_INFO PFX "status report lost?\n");



		spin_lock_bh(&sky2->tx_lock);

		netif_tx_lock_bh(dev);

		sky2_tx_complete(sky2, report);

		spin_unlock_bh(&sky2->tx_lock);

		netif_tx_unlock_bh(dev);

	} else {

		printk(KERN_INFO PFX "hardware hung? flushing\n");



		sky2_write32(hw, Q_ADDR(txq, Q_CSR), BMU_STOP);

		sky2_write32(hw, Y2_QADDR(txq, PREF_UNIT_CTRL), PREF_UNIT_RST_SET);



		sky2_tx_clean(sky2);

		sky2_tx_clean(dev);



		sky2_qset(hw, txq);

		sky2_prefetch_init(hw, txq, sky2->tx_le_map, TX_RING_SIZE - 1);
@@ -1927,9 +1906,9 @@ static inline void sky2_tx_done(struct net_device *dev, u16 last) 
	struct sky2_port *sky2 = netdev_priv(dev);



	if (netif_running(dev)) {

		spin_lock(&sky2->tx_lock);

		netif_tx_lock(dev);

		sky2_tx_complete(sky2, last);

		spin_unlock(&sky2->tx_lock);

		netif_tx_unlock(dev);

	}

}
@@ -3134,7 +3113,6 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw, 
	sky2->hw = hw;

	sky2->msg_enable = netif_msg_init(debug, default_msg);



	spin_lock_init(&sky2->tx_lock);

	/* Auto speed and flow control */

	sky2->autoneg = AUTONEG_ENABLE;

	sky2->tx_pause = 1;
@@ -3153,7 +3131,6 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw, 


	sky2->port = port;



	dev->features |= NETIF_F_LLTX;

	if (hw->chip_id != CHIP_ID_YUKON_EC_U)

		dev->features |= NETIF_F_TSO;

	if (highmem)

drivers/net/sky2.h

+0 −1
Original line number Diff line number Diff line
@@ -1789,7 +1789,6 @@ struct sky2_port { 
	u32		     msg_enable;

	spinlock_t	     phy_lock;



	spinlock_t	     tx_lock  ____cacheline_aligned_in_smp;

	struct tx_ring_info  *tx_ring;

	struct sky2_tx_le    *tx_le;

	u16		     tx_cons;		/* next le to check */