sched: remove qdisc->drop

after removal of TCA_CBQ_OVL_STRATEGY from cbq scheduler, there are no
more callers of ->drop() outside of other ->drop functions, i.e.
nothing calls them.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Florian Westphal

include/net/sch_generic.h

@@ -174,7 +174,6 @@ struct Qdisc_ops {
 	int 			(*enqueue)(struct sk_buff *, struct Qdisc *);
 	struct sk_buff *	(*dequeue)(struct Qdisc *);
 	struct sk_buff *	(*peek)(struct Qdisc *);
-	unsigned int		(*drop)(struct Qdisc *);
 
 	int			(*init)(struct Qdisc *, struct nlattr *arg);
 	void			(*reset)(struct Qdisc *);
@@ -658,22 +657,6 @@ static inline unsigned int qdisc_queue_drop_head(struct Qdisc *sch)
 	return __qdisc_queue_drop_head(sch, &sch->q);
 }
 
-static inline struct sk_buff *__qdisc_dequeue_tail(struct Qdisc *sch,
-						   struct sk_buff_head *list)
-{
-	struct sk_buff *skb = __skb_dequeue_tail(list);
-
-	if (likely(skb != NULL))
-		qdisc_qstats_backlog_dec(sch, skb);
-
-	return skb;
-}
-
-static inline struct sk_buff *qdisc_dequeue_tail(struct Qdisc *sch)
-{
-	return __qdisc_dequeue_tail(sch, &sch->q);
-}
-
 static inline struct sk_buff *qdisc_peek_head(struct Qdisc *sch)
 {
 	return skb_peek(&sch->q);
@@ -741,25 +724,6 @@ static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
 	return old;
 }
 
-static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
-					      struct sk_buff_head *list)
-{
-	struct sk_buff *skb = __qdisc_dequeue_tail(sch, list);
-
-	if (likely(skb != NULL)) {
-		unsigned int len = qdisc_pkt_len(skb);
-		kfree_skb(skb);
-		return len;
-	}
-
-	return 0;
-}
-
-static inline unsigned int qdisc_queue_drop(struct Qdisc *sch)
-{
-	return __qdisc_queue_drop(sch, &sch->q);
-}
-
 static inline int qdisc_drop(struct sk_buff *skb, struct Qdisc *sch)
 {
 	kfree_skb(skb);

net/sched/sch_atm.c

@@ -519,20 +519,6 @@ static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
 	return p->link.q->ops->peek(p->link.q);
 }
 
-static unsigned int atm_tc_drop(struct Qdisc *sch)
-{
-	struct atm_qdisc_data *p = qdisc_priv(sch);
-	struct atm_flow_data *flow;
-	unsigned int len;
-
-	pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
-	list_for_each_entry(flow, &p->flows, list) {
-		if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
-			return len;
-	}
-	return 0;
-}
-
 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
 {
 	struct atm_qdisc_data *p = qdisc_priv(sch);
@@ -672,7 +658,6 @@ static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 	.enqueue	= atm_tc_enqueue,
 	.dequeue	= atm_tc_dequeue,
 	.peek		= atm_tc_peek,
-	.drop		= atm_tc_drop,
 	.init		= atm_tc_init,
 	.reset		= atm_tc_reset,
 	.destroy	= atm_tc_destroy,

net/sched/sch_cbq.c

@@ -1025,31 +1025,6 @@ static void cbq_link_class(struct cbq_class *this)
 	}
 }
 
-static unsigned int cbq_drop(struct Qdisc *sch)
-{
-	struct cbq_sched_data *q = qdisc_priv(sch);
-	struct cbq_class *cl, *cl_head;
-	int prio;
-	unsigned int len;
-
-	for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) {
-		cl_head = q->active[prio];
-		if (!cl_head)
-			continue;
-
-		cl = cl_head;
-		do {
-			if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) {
-				sch->q.qlen--;
-				if (!cl->q->q.qlen)
-					cbq_deactivate_class(cl);
-				return len;
-			}
-		} while ((cl = cl->next_alive) != cl_head);
-	}
-	return 0;
-}
-
 static void
 cbq_reset(struct Qdisc *sch)
 {
@@ -1791,7 +1766,6 @@ static struct Qdisc_ops cbq_qdisc_ops __read_mostly = {
 	.enqueue	=	cbq_enqueue,
 	.dequeue	=	cbq_dequeue,
 	.peek		=	qdisc_peek_dequeued,
-	.drop		=	cbq_drop,
 	.init		=	cbq_init,
 	.reset		=	cbq_reset,
 	.destroy	=	cbq_destroy,

net/sched/sch_choke.c

@@ -365,22 +365,6 @@ static struct sk_buff *choke_dequeue(struct Qdisc *sch)
 	return skb;
 }
 
-static unsigned int choke_drop(struct Qdisc *sch)
-{
-	struct choke_sched_data *q = qdisc_priv(sch);
-	unsigned int len;
-
-	len = qdisc_queue_drop(sch);
-	if (len > 0)
-		q->stats.other++;
-	else {
-		if (!red_is_idling(&q->vars))
-			red_start_of_idle_period(&q->vars);
-	}
-
-	return len;
-}
-
 static void choke_reset(struct Qdisc *sch)
 {
 	struct choke_sched_data *q = qdisc_priv(sch);
@@ -569,7 +553,6 @@ static struct Qdisc_ops choke_qdisc_ops __read_mostly = {
 	.enqueue	=	choke_enqueue,
 	.dequeue	=	choke_dequeue,
 	.peek		=	choke_peek_head,
-	.drop		=	choke_drop,
 	.init		=	choke_init,
 	.destroy	=	choke_destroy,
 	.reset		=	choke_reset,

net/sched/sch_drr.c

@@ -421,26 +421,6 @@ static struct sk_buff *drr_dequeue(struct Qdisc *sch)
 	return NULL;
 }
 
-static unsigned int drr_drop(struct Qdisc *sch)
-{
-	struct drr_sched *q = qdisc_priv(sch);
-	struct drr_class *cl;
-	unsigned int len;
-
-	list_for_each_entry(cl, &q->active, alist) {
-		if (cl->qdisc->ops->drop) {
-			len = cl->qdisc->ops->drop(cl->qdisc);
-			if (len > 0) {
-				sch->q.qlen--;
-				if (cl->qdisc->q.qlen == 0)
-					list_del(&cl->alist);
-				return len;
-			}
-		}
-	}
-	return 0;
-}
-
 static int drr_init_qdisc(struct Qdisc *sch, struct nlattr *opt)
 {
 	struct drr_sched *q = qdisc_priv(sch);
@@ -509,7 +489,6 @@ static struct Qdisc_ops drr_qdisc_ops __read_mostly = {
 	.enqueue	= drr_enqueue,
 	.dequeue	= drr_dequeue,
 	.peek		= qdisc_peek_dequeued,
-	.drop		= drr_drop,
 	.init		= drr_init_qdisc,
 	.reset		= drr_reset_qdisc,
 	.destroy	= drr_destroy_qdisc,

net/sched/sch_dsmark.c

@@ -320,23 +320,6 @@ static struct sk_buff *dsmark_peek(struct Qdisc *sch)
 	return p->q->ops->peek(p->q);
 }
 
-static unsigned int dsmark_drop(struct Qdisc *sch)
-{
-	struct dsmark_qdisc_data *p = qdisc_priv(sch);
-	unsigned int len;
-
-	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
-
-	if (p->q->ops->drop == NULL)
-		return 0;
-
-	len = p->q->ops->drop(p->q);
-	if (len)
-		sch->q.qlen--;
-
-	return len;
-}
-
 static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
 {
 	struct dsmark_qdisc_data *p = qdisc_priv(sch);
@@ -489,7 +472,6 @@ static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
 	.enqueue	=	dsmark_enqueue,
 	.dequeue	=	dsmark_dequeue,
 	.peek		=	dsmark_peek,
-	.drop		=	dsmark_drop,
 	.init		=	dsmark_init,
 	.reset		=	dsmark_reset,
 	.destroy	=	dsmark_destroy,

net/sched/sch_fifo.c

@@ -99,7 +99,6 @@ struct Qdisc_ops pfifo_qdisc_ops __read_mostly = {
 	.enqueue	=	pfifo_enqueue,
 	.dequeue	=	qdisc_dequeue_head,
 	.peek		=	qdisc_peek_head,
-	.drop		=	qdisc_queue_drop,
 	.init		=	fifo_init,
 	.reset		=	qdisc_reset_queue,
 	.change		=	fifo_init,
@@ -114,7 +113,6 @@ struct Qdisc_ops bfifo_qdisc_ops __read_mostly = {
 	.enqueue	=	bfifo_enqueue,
 	.dequeue	=	qdisc_dequeue_head,
 	.peek		=	qdisc_peek_head,
-	.drop		=	qdisc_queue_drop,
 	.init		=	fifo_init,
 	.reset		=	qdisc_reset_queue,
 	.change		=	fifo_init,
@@ -129,7 +127,6 @@ struct Qdisc_ops pfifo_head_drop_qdisc_ops __read_mostly = {
 	.enqueue	=	pfifo_tail_enqueue,
 	.dequeue	=	qdisc_dequeue_head,
 	.peek		=	qdisc_peek_head,
-	.drop		=	qdisc_queue_drop_head,
 	.init		=	fifo_init,
 	.reset		=	qdisc_reset_queue,
 	.change		=	fifo_init,

net/sched/sch_fq_codel.c

@@ -184,15 +184,6 @@ static unsigned int fq_codel_drop(struct Qdisc *sch, unsigned int max_packets)
 	return idx;
 }
 
-static unsigned int fq_codel_qdisc_drop(struct Qdisc *sch)
-{
-	unsigned int prev_backlog;
-
-	prev_backlog = sch->qstats.backlog;
-	fq_codel_drop(sch, 1U);
-	return prev_backlog - sch->qstats.backlog;
-}
-
 static int fq_codel_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 {
 	struct fq_codel_sched_data *q = qdisc_priv(sch);
@@ -704,7 +695,6 @@ static struct Qdisc_ops fq_codel_qdisc_ops __read_mostly = {
 	.enqueue	=	fq_codel_enqueue,
 	.dequeue	=	fq_codel_dequeue,
 	.peek		=	qdisc_peek_dequeued,
-	.drop		=	fq_codel_qdisc_drop,
 	.init		=	fq_codel_init,
 	.reset		=	fq_codel_reset,
 	.destroy	=	fq_codel_destroy,

net/sched/sch_gred.c

@@ -276,40 +276,6 @@ static struct sk_buff *gred_dequeue(struct Qdisc *sch)
 	return NULL;
 }
 
-static unsigned int gred_drop(struct Qdisc *sch)
-{
-	struct sk_buff *skb;
-	struct gred_sched *t = qdisc_priv(sch);
-
-	skb = qdisc_dequeue_tail(sch);
-	if (skb) {
-		unsigned int len = qdisc_pkt_len(skb);
-		struct gred_sched_data *q;
-		u16 dp = tc_index_to_dp(skb);
-
-		if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
-			net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x while dropping, screwing up backlog\n",
-					     tc_index_to_dp(skb));
-		} else {
-			q->backlog -= len;
-			q->stats.other++;
-
-			if (gred_wred_mode(t)) {
-				if (!sch->qstats.backlog)
-					red_start_of_idle_period(&t->wred_set);
-			} else {
-				if (!q->backlog)
-					red_start_of_idle_period(&q->vars);
-			}
-		}
-
-		qdisc_drop(skb, sch);
-		return len;
-	}
-
-	return 0;
-}
-
 static void gred_reset(struct Qdisc *sch)
 {
 	int i;
@@ -623,7 +589,6 @@ static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
 	.enqueue	=	gred_enqueue,
 	.dequeue	=	gred_dequeue,
 	.peek		=	qdisc_peek_head,
-	.drop		=	gred_drop,
 	.init		=	gred_init,
 	.reset		=	gred_reset,
 	.destroy	=	gred_destroy,

net/sched/sch_hfsc.c

@@ -1677,31 +1677,6 @@ hfsc_dequeue(struct Qdisc *sch)
 	return skb;
 }
 
-static unsigned int
-hfsc_drop(struct Qdisc *sch)
-{
-	struct hfsc_sched *q = qdisc_priv(sch);
-	struct hfsc_class *cl;
-	unsigned int len;
-
-	list_for_each_entry(cl, &q->droplist, dlist) {
-		if (cl->qdisc->ops->drop != NULL &&
-		    (len = cl->qdisc->ops->drop(cl->qdisc)) > 0) {
-			if (cl->qdisc->q.qlen == 0) {
-				update_vf(cl, 0, 0);
-				set_passive(cl);
-			} else {
-				list_move_tail(&cl->dlist, &q->droplist);
-			}
-			cl->qstats.drops++;
-			qdisc_qstats_drop(sch);
-			sch->q.qlen--;
-			return len;
-		}
-	}
-	return 0;
-}
-
 static const struct Qdisc_class_ops hfsc_class_ops = {
 	.change		= hfsc_change_class,
 	.delete		= hfsc_delete_class,
@@ -1728,7 +1703,6 @@ static struct Qdisc_ops hfsc_qdisc_ops __read_mostly = {
 	.enqueue	= hfsc_enqueue,
 	.dequeue	= hfsc_dequeue,
 	.peek		= qdisc_peek_dequeued,
-	.drop		= hfsc_drop,
 	.cl_ops		= &hfsc_class_ops,
 	.priv_size	= sizeof(struct hfsc_sched),
 	.owner		= THIS_MODULE