diff options
Diffstat (limited to 'target/linux/generic/pending-4.9/620-net_sched-codel-do-not-defer-queue-length-update.patch')
| -rw-r--r-- | target/linux/generic/pending-4.9/620-net_sched-codel-do-not-defer-queue-length-update.patch | 86 |
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; - } - |