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-rw-r--r--target/linux/generic/patches-4.4/030-net_sched-introduce-qdisc_replace-helper.patch237
1 files changed, 237 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/030-net_sched-introduce-qdisc_replace-helper.patch b/target/linux/generic/patches-4.4/030-net_sched-introduce-qdisc_replace-helper.patch
new file mode 100644
index 0000000000..a3a601b346
--- /dev/null
+++ b/target/linux/generic/patches-4.4/030-net_sched-introduce-qdisc_replace-helper.patch
@@ -0,0 +1,237 @@
+From: WANG Cong <xiyou.wangcong@gmail.com>
+Date: Thu, 25 Feb 2016 14:55:00 -0800
+Subject: [PATCH] net_sched: introduce qdisc_replace() helper
+
+Remove nearly duplicated code and prepare for the following patch.
+
+Cc: Jamal Hadi Salim <jhs@mojatatu.com>
+Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
+Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+
+--- a/include/net/sch_generic.h
++++ b/include/net/sch_generic.h
+@@ -698,6 +698,23 @@ static inline void qdisc_reset_queue(str
+ sch->qstats.backlog = 0;
+ }
+
++static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
++ struct Qdisc **pold)
++{
++ struct Qdisc *old;
++
++ sch_tree_lock(sch);
++ old = *pold;
++ *pold = new;
++ if (old != NULL) {
++ qdisc_tree_decrease_qlen(old, old->q.qlen);
++ qdisc_reset(old);
++ }
++ sch_tree_unlock(sch);
++
++ return old;
++}
++
+ static inline unsigned int __qdisc_queue_drop(struct Qdisc *sch,
+ struct sk_buff_head *list)
+ {
+--- a/net/sched/sch_cbq.c
++++ b/net/sched/sch_cbq.c
+@@ -1624,13 +1624,8 @@ static int cbq_graft(struct Qdisc *sch,
+ new->reshape_fail = cbq_reshape_fail;
+ #endif
+ }
+- sch_tree_lock(sch);
+- *old = cl->q;
+- cl->q = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
+
++ *old = qdisc_replace(sch, new, &cl->q);
+ return 0;
+ }
+
+--- a/net/sched/sch_drr.c
++++ b/net/sched/sch_drr.c
+@@ -226,11 +226,7 @@ static int drr_graft_class(struct Qdisc
+ new = &noop_qdisc;
+ }
+
+- sch_tree_lock(sch);
+- drr_purge_queue(cl);
+- *old = cl->qdisc;
+- cl->qdisc = new;
+- sch_tree_unlock(sch);
++ *old = qdisc_replace(sch, new, &cl->qdisc);
+ return 0;
+ }
+
+--- a/net/sched/sch_dsmark.c
++++ b/net/sched/sch_dsmark.c
+@@ -73,13 +73,7 @@ static int dsmark_graft(struct Qdisc *sc
+ new = &noop_qdisc;
+ }
+
+- sch_tree_lock(sch);
+- *old = p->q;
+- p->q = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
+-
++ *old = qdisc_replace(sch, new, &p->q);
+ return 0;
+ }
+
+--- a/net/sched/sch_hfsc.c
++++ b/net/sched/sch_hfsc.c
+@@ -1215,11 +1215,7 @@ hfsc_graft_class(struct Qdisc *sch, unsi
+ new = &noop_qdisc;
+ }
+
+- sch_tree_lock(sch);
+- hfsc_purge_queue(sch, cl);
+- *old = cl->qdisc;
+- cl->qdisc = new;
+- sch_tree_unlock(sch);
++ *old = qdisc_replace(sch, new, &cl->qdisc);
+ return 0;
+ }
+
+--- a/net/sched/sch_htb.c
++++ b/net/sched/sch_htb.c
+@@ -1163,14 +1163,7 @@ static int htb_graft(struct Qdisc *sch,
+ cl->common.classid)) == NULL)
+ return -ENOBUFS;
+
+- sch_tree_lock(sch);
+- *old = cl->un.leaf.q;
+- cl->un.leaf.q = new;
+- if (*old != NULL) {
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- }
+- sch_tree_unlock(sch);
++ *old = qdisc_replace(sch, new, &cl->un.leaf.q);
+ return 0;
+ }
+
+--- a/net/sched/sch_multiq.c
++++ b/net/sched/sch_multiq.c
+@@ -303,13 +303,7 @@ static int multiq_graft(struct Qdisc *sc
+ if (new == NULL)
+ new = &noop_qdisc;
+
+- sch_tree_lock(sch);
+- *old = q->queues[band];
+- q->queues[band] = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
+-
++ *old = qdisc_replace(sch, new, &q->queues[band]);
+ return 0;
+ }
+
+--- a/net/sched/sch_netem.c
++++ b/net/sched/sch_netem.c
+@@ -1037,15 +1037,7 @@ static int netem_graft(struct Qdisc *sch
+ {
+ struct netem_sched_data *q = qdisc_priv(sch);
+
+- sch_tree_lock(sch);
+- *old = q->qdisc;
+- q->qdisc = new;
+- if (*old) {
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- }
+- sch_tree_unlock(sch);
+-
++ *old = qdisc_replace(sch, new, &q->qdisc);
+ return 0;
+ }
+
+--- a/net/sched/sch_prio.c
++++ b/net/sched/sch_prio.c
+@@ -268,13 +268,7 @@ static int prio_graft(struct Qdisc *sch,
+ if (new == NULL)
+ new = &noop_qdisc;
+
+- sch_tree_lock(sch);
+- *old = q->queues[band];
+- q->queues[band] = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
+-
++ *old = qdisc_replace(sch, new, &q->queues[band]);
+ return 0;
+ }
+
+--- a/net/sched/sch_qfq.c
++++ b/net/sched/sch_qfq.c
+@@ -617,11 +617,7 @@ static int qfq_graft_class(struct Qdisc
+ new = &noop_qdisc;
+ }
+
+- sch_tree_lock(sch);
+- qfq_purge_queue(cl);
+- *old = cl->qdisc;
+- cl->qdisc = new;
+- sch_tree_unlock(sch);
++ *old = qdisc_replace(sch, new, &cl->qdisc);
+ return 0;
+ }
+
+--- a/net/sched/sch_red.c
++++ b/net/sched/sch_red.c
+@@ -313,12 +313,7 @@ static int red_graft(struct Qdisc *sch,
+ if (new == NULL)
+ new = &noop_qdisc;
+
+- sch_tree_lock(sch);
+- *old = q->qdisc;
+- q->qdisc = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
++ *old = qdisc_replace(sch, new, &q->qdisc);
+ return 0;
+ }
+
+--- a/net/sched/sch_sfb.c
++++ b/net/sched/sch_sfb.c
+@@ -606,12 +606,7 @@ static int sfb_graft(struct Qdisc *sch,
+ if (new == NULL)
+ new = &noop_qdisc;
+
+- sch_tree_lock(sch);
+- *old = q->qdisc;
+- q->qdisc = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
++ *old = qdisc_replace(sch, new, &q->qdisc);
+ return 0;
+ }
+
+--- a/net/sched/sch_tbf.c
++++ b/net/sched/sch_tbf.c
+@@ -502,13 +502,7 @@ static int tbf_graft(struct Qdisc *sch,
+ if (new == NULL)
+ new = &noop_qdisc;
+
+- sch_tree_lock(sch);
+- *old = q->qdisc;
+- q->qdisc = new;
+- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+- qdisc_reset(*old);
+- sch_tree_unlock(sch);
+-
++ *old = qdisc_replace(sch, new, &q->qdisc);
+ return 0;
+ }
+
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