net: Add queue state xoff flag for stack

Create separate queue state flags so that either the stack or drivers
can turn on XOFF.  Added a set of functions used in the stack to determine
if a queue is really stopped (either by stack or driver)

Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 16 insertions, 14 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index c7ef6c5..cb8f753 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2270,7 +2270,7 @@ gso:
 			return rc;
 		}
 		txq_trans_update(txq);
-		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
+		if (unlikely(netif_xmit_stopped(txq) && skb->next))
 			return NETDEV_TX_BUSY;
 	} while (skb->next);
 
@@ -2558,7 +2558,7 @@ int dev_queue_xmit(struct sk_buff *skb)
 
 			HARD_TX_LOCK(dev, txq, cpu);
 
-			if (!netif_tx_queue_stopped(txq)) {
+			if (!netif_xmit_stopped(txq)) {
 				__this_cpu_inc(xmit_recursion);
 				rc = dev_hard_start_xmit(skb, dev, txq);
 				__this_cpu_dec(xmit_recursion);
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 1a7d8e2..0d38808 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -76,7 +76,7 @@ static void queue_process(struct work_struct *work)
 
 		local_irq_save(flags);
 		__netif_tx_lock(txq, smp_processor_id());
-		if (netif_tx_queue_frozen_or_stopped(txq) ||
+		if (netif_xmit_frozen_or_stopped(txq) ||
 		    ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) {
 			skb_queue_head(&npinfo->txq, skb);
 			__netif_tx_unlock(txq);
@@ -317,7 +317,7 @@ void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
 		for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
 		     tries > 0; --tries) {
 			if (__netif_tx_trylock(txq)) {
-				if (!netif_tx_queue_stopped(txq)) {
+				if (!netif_xmit_stopped(txq)) {
 					status = ops->ndo_start_xmit(skb, dev);
 					if (status == NETDEV_TX_OK)
 						txq_trans_update(txq);
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index aa53a35..449fe0f 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3342,7 +3342,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
 
 	__netif_tx_lock_bh(txq);
 
-	if (unlikely(netif_tx_queue_frozen_or_stopped(txq))) {
+	if (unlikely(netif_xmit_frozen_or_stopped(txq))) {
 		ret = NETDEV_TX_BUSY;
 		pkt_dev->last_ok = 0;
 		goto unlock;
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 79ac145..67fc573 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -60,7 +60,7 @@ static inline struct sk_buff *dequeue_skb(struct Qdisc *q)
 
 		/* check the reason of requeuing without tx lock first */
 		txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
-		if (!netif_tx_queue_frozen_or_stopped(txq)) {
+		if (!netif_xmit_frozen_or_stopped(txq)) {
 			q->gso_skb = NULL;
 			q->q.qlen--;
 		} else
@@ -121,7 +121,7 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 	spin_unlock(root_lock);
 
 	HARD_TX_LOCK(dev, txq, smp_processor_id());
-	if (!netif_tx_queue_frozen_or_stopped(txq))
+	if (!netif_xmit_frozen_or_stopped(txq))
 		ret = dev_hard_start_xmit(skb, dev, txq);
 
 	HARD_TX_UNLOCK(dev, txq);
@@ -143,7 +143,7 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 		ret = dev_requeue_skb(skb, q);
 	}
 
-	if (ret && netif_tx_queue_frozen_or_stopped(txq))
+	if (ret && netif_xmit_frozen_or_stopped(txq))
 		ret = 0;
 
 	return ret;
@@ -242,7 +242,7 @@ static void dev_watchdog(unsigned long arg)
 				 * old device drivers set dev->trans_start
 				 */
 				trans_start = txq->trans_start ? : dev->trans_start;
-				if (netif_tx_queue_stopped(txq) &&
+				if (netif_xmit_stopped(txq) &&
 				    time_after(jiffies, (trans_start +
 							 dev->watchdog_timeo))) {
 					some_queue_timedout = 1;
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index edc1950..49131d7 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -107,7 +107,8 @@ static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
 		/* Check that target subqueue is available before
 		 * pulling an skb to avoid head-of-line blocking.
 		 */
-		if (!__netif_subqueue_stopped(qdisc_dev(sch), q->curband)) {
+		if (!netif_xmit_stopped(
+		    netdev_get_tx_queue(qdisc_dev(sch), q->curband))) {
 			qdisc = q->queues[q->curband];
 			skb = qdisc->dequeue(qdisc);
 			if (skb) {
@@ -138,7 +139,8 @@ static struct sk_buff *multiq_peek(struct Qdisc *sch)
 		/* Check that target subqueue is available before
 		 * pulling an skb to avoid head-of-line blocking.
 		 */
-		if (!__netif_subqueue_stopped(qdisc_dev(sch), curband)) {
+		if (!netif_xmit_stopped(
+		    netdev_get_tx_queue(qdisc_dev(sch), curband))) {
 			qdisc = q->queues[curband];
 			skb = qdisc->ops->peek(qdisc);
 			if (skb)
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index a3b7120..283bfe3 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -301,7 +301,7 @@ restart:
 
 		if (slave_txq->qdisc_sleeping != q)
 			continue;
-		if (__netif_subqueue_stopped(slave, subq) ||
+		if (netif_xmit_stopped(netdev_get_tx_queue(slave, subq)) ||
 		    !netif_running(slave)) {
 			busy = 1;
 			continue;
@@ -312,7 +312,7 @@ restart:
 			if (__netif_tx_trylock(slave_txq)) {
 				unsigned int length = qdisc_pkt_len(skb);
 
-				if (!netif_tx_queue_frozen_or_stopped(slave_txq) &&
+				if (!netif_xmit_frozen_or_stopped(slave_txq) &&
 				    slave_ops->ndo_start_xmit(skb, slave) == NETDEV_TX_OK) {
 					txq_trans_update(slave_txq);
 					__netif_tx_unlock(slave_txq);
@@ -324,7 +324,7 @@ restart:
 				}
 				__netif_tx_unlock(slave_txq);
 			}
-			if (netif_queue_stopped(dev))
+			if (netif_xmit_stopped(netdev_get_tx_queue(dev, 0)))
 				busy = 1;
 			break;
 		case 1: