From: John Fastabend <john.fastabend@gmail.com>
Date: Thu, 7 Dec 2017 09:54:47 -0800
Subject: net: sched: remove remaining uses for qdisc_qlen in xmit path
Patch-mainline: v4.16-rc1
Git-commit: 29b86cdac00a82f88b81c16659e64cc624550216
References: bsc#1109837

sch_direct_xmit() uses qdisc_qlen as a return value but all call sites
of the routine only check if it is zero or not. Simplify the logic so
that we don't need to return an actual queue length value.

This introduces a case now where sch_direct_xmit would have returned
a qlen of zero but now it returns true. However in this case all
call sites of sch_direct_xmit will implement a dequeue() and get
a null skb and abort. This trades tracking qlen in the hotpath for
an extra dequeue operation. Overall this seems to be good for
performance.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/pkt_sched.h |    6 +++---
 net/sched/sch_generic.c |   28 +++++++++++++---------------
 2 files changed, 16 insertions(+), 18 deletions(-)

--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -104,9 +104,9 @@ struct qdisc_rate_table *qdisc_get_rtab(
 void qdisc_put_rtab(struct qdisc_rate_table *tab);
 void qdisc_put_stab(struct qdisc_size_table *tab);
 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
-int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
-		    struct net_device *dev, struct netdev_queue *txq,
-		    spinlock_t *root_lock, bool validate);
+bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
+		     struct net_device *dev, struct netdev_queue *txq,
+		     spinlock_t *root_lock, bool validate);
 
 void __qdisc_run(struct Qdisc *q);
 
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -161,12 +161,12 @@ bulk:
  * only one CPU can execute this function.
  *
  * Returns to the caller:
- *				0  - queue is empty or throttled.
- *				>0 - queue is not empty.
+ *				false  - hardware queue frozen backoff
+ *				true   - feel free to send more pkts
  */
-int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
-		    struct net_device *dev, struct netdev_queue *txq,
-		    spinlock_t *root_lock, bool validate)
+bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
+		     struct net_device *dev, struct netdev_queue *txq,
+		     spinlock_t *root_lock, bool validate)
 {
 	int ret = NETDEV_TX_BUSY;
 
@@ -187,28 +187,26 @@ int sch_direct_xmit(struct sk_buff *skb,
 	} else {
 		if (root_lock)
 			spin_lock(root_lock);
-		return qdisc_qlen(q);
+		return true;
 	}
 
 	if (root_lock)
 		spin_lock(root_lock);
 
-	if (dev_xmit_complete(ret)) {
-		/* Driver sent out skb successfully or skb was consumed */
-		ret = qdisc_qlen(q);
-	} else {
+	if (!dev_xmit_complete(ret)) {
 		/* Driver returned NETDEV_TX_BUSY - requeue skb */
 		if (unlikely(ret != NETDEV_TX_BUSY))
 			net_warn_ratelimited("BUG %s code %d qlen %d\n",
 					     dev->name, ret, q->q.qlen);
 
-		ret = dev_requeue_skb(skb, q);
+		dev_requeue_skb(skb, q);
+		return false;
 	}
 
 	if (ret && netif_xmit_frozen_or_stopped(txq))
-		ret = 0;
+		return false;
 
-	return ret;
+	return true;
 }
 
 /*
@@ -230,7 +228,7 @@ int sch_direct_xmit(struct sk_buff *skb,
  *				>0 - queue is not empty.
  *
  */
-static inline int qdisc_restart(struct Qdisc *q, int *packets)
+static inline bool qdisc_restart(struct Qdisc *q, int *packets)
 {
 	spinlock_t *root_lock = NULL;
 	struct netdev_queue *txq;
@@ -241,7 +239,7 @@ static inline int qdisc_restart(struct Q
 	/* Dequeue packet */
 	skb = dequeue_skb(q, &validate, packets);
 	if (unlikely(!skb))
-		return 0;
+		return false;
 
 	if (!(q->flags & TCQ_F_NOLOCK))
 		root_lock = qdisc_lock(q);