From b01ac095c740fc21f4bb21abe900b0f5b3042cf9 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Thu, 7 Dec 2017 09:57:20 -0800 Subject: [PATCH] net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mq The sch_mq qdisc creates a sub-qdisc per tx queue which are then called independently for enqueue and dequeue operations. However statistics are aggregated and pushed up to the "master" qdisc. This patch adds support for any of the sub-qdiscs to be per cpu statistic qdiscs. To handle this case add a check when calculating stats and aggregate the per cpu stats if needed. Also exports __gnet_stats_copy_queue() to use as a helper function. Signed-off-by: John Fastabend Signed-off-by: David S. Miller --- include/net/gen_stats.h | 3 +++ net/core/gen_stats.c | 9 +++++---- net/sched/sch_mq.c | 25 ++++++++++++++++++------- 3 files changed, 26 insertions(+), 11 deletions(-) diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h index 304f7aa..0304ba2 100644 --- a/include/net/gen_stats.h +++ b/include/net/gen_stats.h @@ -49,6 +49,9 @@ int gnet_stats_copy_rate_est(struct gnet_dump *d, int gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue __percpu *cpu_q, struct gnet_stats_queue *q, __u32 qlen); +void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, + const struct gnet_stats_queue __percpu *cpu_q, + const struct gnet_stats_queue *q, __u32 qlen); int gnet_stats_copy_app(struct gnet_dump *d, void *st, int len); int gnet_stats_finish_copy(struct gnet_dump *d); diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c index 87f2855..b2b2323b 100644 --- a/net/core/gen_stats.c +++ b/net/core/gen_stats.c @@ -252,10 +252,10 @@ __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats, } } -static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, - const struct gnet_stats_queue __percpu *cpu, - const struct gnet_stats_queue *q, - __u32 qlen) +void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, + const struct gnet_stats_queue __percpu *cpu, + const struct gnet_stats_queue *q, + __u32 qlen) { if (cpu) { __gnet_stats_copy_queue_cpu(qstats, cpu); @@ -269,6 +269,7 @@ static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats, qstats->qlen = qlen; } +EXPORT_SYMBOL(__gnet_stats_copy_queue); /** * gnet_stats_copy_queue - copy queue statistics into statistics TLV diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c index 213b586..bc59f05 100644 --- a/net/sched/sch_mq.c +++ b/net/sched/sch_mq.c @@ -17,6 +17,7 @@ #include #include #include +#include struct mq_sched { struct Qdisc **qdiscs; @@ -103,15 +104,25 @@ static int mq_dump(struct Qdisc *sch, struct sk_buff *skb) memset(&sch->qstats, 0, sizeof(sch->qstats)); for (ntx = 0; ntx < dev->num_tx_queues; ntx++) { + struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL; + struct gnet_stats_queue __percpu *cpu_qstats = NULL; + __u32 qlen = 0; + qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping; spin_lock_bh(qdisc_lock(qdisc)); - sch->q.qlen += qdisc->q.qlen; - sch->bstats.bytes += qdisc->bstats.bytes; - sch->bstats.packets += qdisc->bstats.packets; - sch->qstats.backlog += qdisc->qstats.backlog; - sch->qstats.drops += qdisc->qstats.drops; - sch->qstats.requeues += qdisc->qstats.requeues; - sch->qstats.overlimits += qdisc->qstats.overlimits; + + if (qdisc_is_percpu_stats(qdisc)) { + cpu_bstats = qdisc->cpu_bstats; + cpu_qstats = qdisc->cpu_qstats; + } + + qlen = qdisc_qlen_sum(qdisc); + + __gnet_stats_copy_basic(NULL, &sch->bstats, + cpu_bstats, &qdisc->bstats); + __gnet_stats_copy_queue(&sch->qstats, + cpu_qstats, &qdisc->qstats, qlen); + spin_unlock_bh(qdisc_lock(qdisc)); } return 0; -- 2.7.4