net: Use queue aware tests throughout.

This effectively "flips the switch" by making the core networking
and multiqueue-aware drivers use the new TX multiqueue structures.

Non-multiqueue drivers need no changes.  The interfaces they use such
as netif_stop_queue() degenerate into an operation on TX queue zero.
So everything "just works" for them.

Code that really wants to do "X" to all TX queues now invokes a
routine that does so, such as netif_tx_wake_all_queues(),
netif_tx_stop_all_queues(), etc.

pktgen and netpoll required a little bit more surgery than the others.

In particular the pktgen changes, whilst functional, could be largely
improved.  The initial check in pktgen_xmit() will sometimes check the
wrong queue, which is mostly harmless.  The thing to do is probably to
invoke fill_packet() earlier.

The bulk of the netpoll changes is to make the code operate solely on
the TX queue indicated by by the SKB queue mapping.

Setting of the SKB queue mapping is entirely confined inside of
net/core/dev.c:dev_pick_tx().  If we end up needing any kind of
special semantics (drops, for example) it will be implemented here.

Finally, we now have a "real_num_tx_queues" which is where the driver
indicates how many TX queues are actually active.

With IGB changes from Jeff Kirsher.

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 39 insertions, 73 deletions

diff --git a/drivers/net/cpmac.c b/drivers/net/cpmac.c
index 7c7b54e4828..fbd4280c102 100644
--- a/drivers/net/cpmac.c
+++ b/drivers/net/cpmac.c
@@ -544,7 +544,7 @@ fatal_error:
 
 	spin_unlock(&priv->rx_lock);
 	netif_rx_complete(priv->dev, napi);
-	netif_stop_queue(priv->dev);
+	netif_tx_stop_all_queues(priv->dev);
 	napi_disable(&priv->napi);
 
 	atomic_inc(&priv->reset_pending);
@@ -750,9 +750,7 @@ static void cpmac_hw_error(struct work_struct *work)
 	barrier();
 	atomic_dec(&priv->reset_pending);
 
-	for (i = 0; i < CPMAC_QUEUES; i++)
-		netif_wake_subqueue(priv->dev, i);
-	netif_wake_queue(priv->dev);
+	netif_tx_wake_all_queues(priv->dev);
 	cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
 }
 
@@ -781,7 +779,7 @@ static void cpmac_check_status(struct net_device *dev)
 				     dev->name, tx_code, tx_channel, macstatus);
 		}
 
-		netif_stop_queue(dev);
+		netif_tx_stop_all_queues(dev);
 		cpmac_hw_stop(dev);
 		if (schedule_work(&priv->reset_work))
 			atomic_inc(&priv->reset_pending);
@@ -842,9 +840,7 @@ static void cpmac_tx_timeout(struct net_device *dev)
 	barrier();
 	atomic_dec(&priv->reset_pending);
 
-	netif_wake_queue(priv->dev);
-	for (i = 0; i < CPMAC_QUEUES; i++)
-		netif_wake_subqueue(dev, i);
+	netif_tx_wake_all_queues(priv->dev);
 }
 
 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
@@ -935,7 +931,7 @@ static void cpmac_adjust_link(struct net_device *dev)
 
 	spin_lock(&priv->lock);
 	if (priv->phy->link) {
-		netif_start_queue(dev);
+		netif_tx_start_all_queues(dev);
 		if (priv->phy->duplex != priv->oldduplex) {
 			new_state = 1;
 			priv->oldduplex = priv->phy->duplex;
@@ -949,10 +945,10 @@ static void cpmac_adjust_link(struct net_device *dev)
 		if (!priv->oldlink) {
 			new_state = 1;
 			priv->oldlink = 1;
-			netif_schedule(dev);
+			netif_tx_schedule_all(dev);
 		}
 	} else if (priv->oldlink) {
-		netif_stop_queue(dev);
+		netif_tx_stop_all_queues(dev);
 		new_state = 1;
 		priv->oldlink = 0;
 		priv->oldspeed = 0;
@@ -1072,7 +1068,7 @@ static int cpmac_stop(struct net_device *dev)
 	struct cpmac_priv *priv = netdev_priv(dev);
 	struct resource *mem;
 
-	netif_stop_queue(dev);
+	netif_tx_stop_all_queues(dev);
 
 	cancel_work_sync(&priv->reset_work);
 	napi_disable(&priv->napi);
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 471c194cd54..81bba6983dd 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -533,7 +533,7 @@ msi_only:
 		adapter->flags |= IGB_FLAG_HAS_MSI;
 
 	/* Notify the stack of the (possibly) reduced Tx Queue count. */
-	adapter->netdev->egress_subqueue_count = adapter->num_tx_queues;
+	adapter->netdev->real_num_tx_queues = adapter->num_tx_queues;
 	return;
 }
 
@@ -821,9 +821,7 @@ void igb_down(struct igb_adapter *adapter)
 	wr32(E1000_RCTL, rctl & ~E1000_RCTL_EN);
 	/* flush and sleep below */
 
-	netif_stop_queue(netdev);
-	for (i = 0; i < adapter->num_tx_queues; i++)
-		netif_stop_subqueue(netdev, i);
+	netif_tx_stop_all_queues(netdev);
 
 	/* disable transmits in the hardware */
 	tctl = rd32(E1000_TCTL);
@@ -1266,9 +1264,7 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 
 	/* tell the stack to leave us alone until igb_open() is called */
 	netif_carrier_off(netdev);
-	netif_stop_queue(netdev);
-	for (i = 0; i < adapter->num_tx_queues; i++)
-		netif_stop_subqueue(netdev, i);
+	netif_tx_stop_all_queues(netdev);
 
 	strcpy(netdev->name, "eth%d");
 	err = register_netdev(netdev);
@@ -2315,7 +2311,6 @@ static void igb_watchdog_task(struct work_struct *work)
 	struct e1000_mac_info *mac = &adapter->hw.mac;
 	u32 link;
 	s32 ret_val;
-	int i;
 
 	if ((netif_carrier_ok(netdev)) &&
 	    (rd32(E1000_STATUS) & E1000_STATUS_LU))
@@ -2371,9 +2366,7 @@ static void igb_watchdog_task(struct work_struct *work)
 			}
 
 			netif_carrier_on(netdev);
-			netif_wake_queue(netdev);
-			for (i = 0; i < adapter->num_tx_queues; i++)
-				netif_wake_subqueue(netdev, i);
+			netif_tx_wake_all_queues(netdev);
 
 			if (!test_bit(__IGB_DOWN, &adapter->state))
 				mod_timer(&adapter->phy_info_timer,
@@ -2385,9 +2378,7 @@ static void igb_watchdog_task(struct work_struct *work)
 			adapter->link_duplex = 0;
 			dev_info(&adapter->pdev->dev, "NIC Link is Down\n");
 			netif_carrier_off(netdev);
-			netif_stop_queue(netdev);
-			for (i = 0; i < adapter->num_tx_queues; i++)
-				netif_stop_subqueue(netdev, i);
+			netif_tx_stop_all_queues(netdev);
 			if (!test_bit(__IGB_DOWN, &adapter->state))
 				mod_timer(&adapter->phy_info_timer,
 					  round_jiffies(jiffies + 2 * HZ));
diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index 81b769093d2..3efe5dda10a 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -252,16 +252,10 @@ static int ixgbe_set_tso(struct net_device *netdev, u32 data)
 		netdev->features |= NETIF_F_TSO;
 		netdev->features |= NETIF_F_TSO6;
 	} else {
-		struct ixgbe_adapter *adapter = netdev_priv(netdev);
-		int i;
-		netif_stop_queue(netdev);
-		for (i = 0; i < adapter->num_tx_queues; i++)
-			netif_stop_subqueue(netdev, i);
+		netif_tx_stop_all_queues(netdev);
 		netdev->features &= ~NETIF_F_TSO;
 		netdev->features &= ~NETIF_F_TSO6;
-		for (i = 0; i < adapter->num_tx_queues; i++)
-			netif_start_subqueue(netdev, i);
-		netif_start_queue(netdev);
+		netif_tx_start_all_queues(netdev);
 	}
 	return 0;
 }
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index e6df9233f5e..6af8fb5c4b5 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2013,7 +2013,7 @@ void ixgbe_down(struct ixgbe_adapter *adapter)
 	del_timer_sync(&adapter->watchdog_timer);
 
 	netif_carrier_off(netdev);
-	netif_stop_queue(netdev);
+	netif_tx_stop_all_queues(netdev);
 
 	if (!pci_channel_offline(adapter->pdev))
 		ixgbe_reset(adapter);
@@ -2359,7 +2359,7 @@ try_msi:
 
 out:
 	/* Notify the stack of the (possibly) reduced Tx Queue count. */
-	adapter->netdev->egress_subqueue_count = adapter->num_tx_queues;
+	adapter->netdev->real_num_tx_queues = adapter->num_tx_queues;
 
 	return err;
 }
@@ -2896,7 +2896,6 @@ static void ixgbe_watchdog(unsigned long data)
 	struct net_device *netdev = adapter->netdev;
 	bool link_up;
 	u32 link_speed = 0;
-	int i;
 
 	adapter->hw.mac.ops.check_link(&adapter->hw, &(link_speed), &link_up);
 
@@ -2917,9 +2916,7 @@ static void ixgbe_watchdog(unsigned long data)
 				 (FLOW_TX ? "TX" : "None"))));
 
 			netif_carrier_on(netdev);
-			netif_wake_queue(netdev);
-			for (i = 0; i < adapter->num_tx_queues; i++)
-				netif_wake_subqueue(netdev, i);
+			netif_tx_wake_all_queues(netdev);
 		} else {
 			/* Force detection of hung controller */
 			adapter->detect_tx_hung = true;
@@ -2928,7 +2925,7 @@ static void ixgbe_watchdog(unsigned long data)
 		if (netif_carrier_ok(netdev)) {
 			DPRINTK(LINK, INFO, "NIC Link is Down\n");
 			netif_carrier_off(netdev);
-			netif_stop_queue(netdev);
+			netif_tx_stop_all_queues(netdev);
 		}
 	}
 
@@ -3631,9 +3628,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
 	ixgbe_start_hw(hw);
 
 	netif_carrier_off(netdev);
-	netif_stop_queue(netdev);
-	for (i = 0; i < adapter->num_tx_queues; i++)
-		netif_stop_subqueue(netdev, i);
+	netif_tx_stop_all_queues(netdev);
 
 	ixgbe_napi_add_all(adapter);
 
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 5f0fcb04aff..9dae40ccf04 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -545,63 +545,53 @@ static struct pci_driver s2io_driver = {
 /* netqueue manipulation helper functions */
 static inline void s2io_stop_all_tx_queue(struct s2io_nic *sp)
 {
-	int i;
-	if (sp->config.multiq) {
-		for (i = 0; i < sp->config.tx_fifo_num; i++)
-			netif_stop_subqueue(sp->dev, i);
-	} else {
+	if (!sp->config.multiq) {
+		int i;
+
 		for (i = 0; i < sp->config.tx_fifo_num; i++)
 			sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_STOP;
-		netif_stop_queue(sp->dev);
 	}
+	netif_tx_stop_all_queues(sp->dev);
 }
 
 static inline void s2io_stop_tx_queue(struct s2io_nic *sp, int fifo_no)
 {
-	if (sp->config.multiq)
-		netif_stop_subqueue(sp->dev, fifo_no);
-	else {
+	if (!sp->config.multiq)
 		sp->mac_control.fifos[fifo_no].queue_state =
 			FIFO_QUEUE_STOP;
-		netif_stop_queue(sp->dev);
-	}
+
+	netif_tx_stop_all_queues(sp->dev);
 }
 
 static inline void s2io_start_all_tx_queue(struct s2io_nic *sp)
 {
-	int i;
-	if (sp->config.multiq) {
-		for (i = 0; i < sp->config.tx_fifo_num; i++)
-			netif_start_subqueue(sp->dev, i);
-	} else {
+	if (!sp->config.multiq) {
+		int i;
+
 		for (i = 0; i < sp->config.tx_fifo_num; i++)
 			sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_START;
-		netif_start_queue(sp->dev);
 	}
+	netif_tx_start_all_queues(sp->dev);
 }
 
 static inline void s2io_start_tx_queue(struct s2io_nic *sp, int fifo_no)
 {
-	if (sp->config.multiq)
-		netif_start_subqueue(sp->dev, fifo_no);
-	else {
+	if (!sp->config.multiq)
 		sp->mac_control.fifos[fifo_no].queue_state =
 			FIFO_QUEUE_START;
-		netif_start_queue(sp->dev);
-	}
+
+	netif_tx_start_all_queues(sp->dev);
 }
 
 static inline void s2io_wake_all_tx_queue(struct s2io_nic *sp)
 {
-	int i;
-	if (sp->config.multiq) {
-		for (i = 0; i < sp->config.tx_fifo_num; i++)
-			netif_wake_subqueue(sp->dev, i);
-	} else {
+	if (!sp->config.multiq) {
+		int i;
+
 		for (i = 0; i < sp->config.tx_fifo_num; i++)
 			sp->mac_control.fifos[i].queue_state = FIFO_QUEUE_START;
-		netif_wake_queue(sp->dev);
 	}
+	netif_tx_wake_all_queues(sp->dev);
 }
 
 static inline void s2io_wake_tx_queue(
@@ -8691,5 +8681,5 @@ static void s2io_io_resume(struct pci_dev *pdev)
 	}
 
 	netif_device_attach(netdev);
-	netif_wake_queue(netdev);
+	netif_tx_wake_all_queues(netdev);
 }