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net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mq

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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 <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2017-12-07 09:57:20 -08:00 committed by David S. Miller
parent 7e66016f2c
commit b01ac095c7
3 changed files with 26 additions and 11 deletions
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3
include/net/gen_stats.h
View File

@ -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);

3
net/core/gen_stats.c
View File

@ -252,7 +252,7 @@ __gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
}
}
static void __gnet_stats_copy_queue(struct gnet_stats_queue *qstats,
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)
@ -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

25
net/sched/sch_mq.c
View File

@ -17,6 +17,7 @@
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/sch_generic.h>
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;