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-rw-r--r--target/linux/generic/pending-4.9/620-net_sched-codel-do-not-defer-queue-length-update.patch86
1 files changed, 0 insertions, 86 deletions
diff --git a/target/linux/generic/pending-4.9/620-net_sched-codel-do-not-defer-queue-length-update.patch b/target/linux/generic/pending-4.9/620-net_sched-codel-do-not-defer-queue-length-update.patch
deleted file mode 100644
index 6fe863a9e5..0000000000
--- a/target/linux/generic/pending-4.9/620-net_sched-codel-do-not-defer-queue-length-update.patch
+++ /dev/null
@@ -1,86 +0,0 @@
-From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
-Date: Mon, 21 Aug 2017 11:14:14 +0300
-Subject: [PATCH] net_sched/codel: do not defer queue length update
-
-When codel wants to drop last packet in ->dequeue() it cannot call
-qdisc_tree_reduce_backlog() right away - it will notify parent qdisc
-about zero qlen and HTB/HFSC will deactivate class. The same class will
-be deactivated second time by caller of ->dequeue(). Currently codel and
-fq_codel defer update. This triggers warning in HFSC when it's qlen != 0
-but there is no active classes.
-
-This patch update parent queue length immediately: just temporary increase
-qlen around qdisc_tree_reduce_backlog() to prevent first class deactivation
-if we have skb to return.
-
-This might open another problem in HFSC - now operation peek could fail and
-deactivate parent class.
-
-Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
-Link: https://bugzilla.kernel.org/show_bug.cgi?id=109581
----
-
---- a/net/sched/sch_codel.c
-+++ b/net/sched/sch_codel.c
-@@ -95,11 +95,17 @@ static struct sk_buff *codel_qdisc_deque
- &q->stats, qdisc_pkt_len, codel_get_enqueue_time,
- drop_func, dequeue_func);
-
-- /* We cant call qdisc_tree_reduce_backlog() if our qlen is 0,
-- * or HTB crashes. Defer it for next round.
-+ /* If our qlen is 0 qdisc_tree_reduce_backlog() will deactivate
-+ * parent class, dequeue in parent qdisc will do the same if we
-+ * return skb. Temporary increment qlen if we have skb.
- */
-- if (q->stats.drop_count && sch->q.qlen) {
-- qdisc_tree_reduce_backlog(sch, q->stats.drop_count, q->stats.drop_len);
-+ if (q->stats.drop_count) {
-+ if (skb)
-+ sch->q.qlen++;
-+ qdisc_tree_reduce_backlog(sch, q->stats.drop_count,
-+ q->stats.drop_len);
-+ if (skb)
-+ sch->q.qlen--;
- q->stats.drop_count = 0;
- q->stats.drop_len = 0;
- }
---- a/net/sched/sch_fq_codel.c
-+++ b/net/sched/sch_fq_codel.c
-@@ -318,6 +318,21 @@ begin:
- flow->dropped += q->cstats.drop_count - prev_drop_count;
- flow->dropped += q->cstats.ecn_mark - prev_ecn_mark;
-
-+ /* If our qlen is 0 qdisc_tree_reduce_backlog() will deactivate
-+ * parent class, dequeue in parent qdisc will do the same if we
-+ * return skb. Temporary increment qlen if we have skb.
-+ */
-+ if (q->cstats.drop_count) {
-+ if (skb)
-+ sch->q.qlen++;
-+ qdisc_tree_reduce_backlog(sch, q->cstats.drop_count,
-+ q->cstats.drop_len);
-+ if (skb)
-+ sch->q.qlen--;
-+ q->cstats.drop_count = 0;
-+ q->cstats.drop_len = 0;
-+ }
-+
- if (!skb) {
- /* force a pass through old_flows to prevent starvation */
- if ((head == &q->new_flows) && !list_empty(&q->old_flows))
-@@ -328,15 +343,6 @@ begin:
- }
- qdisc_bstats_update(sch, skb);
- flow->deficit -= qdisc_pkt_len(skb);
-- /* We cant call qdisc_tree_reduce_backlog() if our qlen is 0,
-- * or HTB crashes. Defer it for next round.
-- */
-- if (q->cstats.drop_count && sch->q.qlen) {
-- qdisc_tree_reduce_backlog(sch, q->cstats.drop_count,
-- q->cstats.drop_len);
-- q->cstats.drop_count = 0;
-- q->cstats.drop_len = 0;
-- }
- return skb;
- }
-