net: sched: enable per cpu qstats

After previous patches to simplify qstats the qstats can be
made per cpu with a packed union in Qdisc struct.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index de9b3dd..cbafa37 100644 (file)
--- a/include/net/gen_stats.h
+++ b/include/net/gen_stats.h
@@ -41,7 +41,8 @@ int gnet_stats_copy_rate_est(struct gnet_dump *d,
                             const struct gnet_stats_basic_packed *b,
                             struct gnet_stats_rate_est64 *r);
 int gnet_stats_copy_queue(struct gnet_dump *d,
-                         struct gnet_stats_queue *q, __u32 len);
+                         struct gnet_stats_queue __percpu *cpu_q,
+                         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/include/net/sch_generic.h b/include/net/sch_generic.h
index 23a0f0f..f126698 100644 (file)
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -90,7 +90,10 @@ struct Qdisc {
                struct gnet_stats_basic_cpu __percpu *cpu_bstats;
        } __packed;
        unsigned int            __state;
-       struct gnet_stats_queue qstats;
+       union {
+               struct gnet_stats_queue qstats;
+               struct gnet_stats_queue __percpu *cpu_qstats;
+       } __packed;
        struct rcu_head         rcu_head;
        int                     padded;
        atomic_t                refcnt;
@@ -543,6 +546,13 @@ static inline void qdisc_qstats_drop(struct Qdisc *sch)
        sch->qstats.drops++;
 }
 
+static inline void qdisc_qstats_drop_cpu(struct Qdisc *sch)
+{
+       struct gnet_stats_queue *qstats = this_cpu_ptr(sch->cpu_qstats);
+
+       qstats->drops++;
+}
+
 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
 {
        sch->qstats.overlimits++;

diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index ad3ecb6..14681b9 100644 (file)
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -215,33 +215,74 @@ gnet_stats_copy_rate_est(struct gnet_dump *d,
 }
 EXPORT_SYMBOL(gnet_stats_copy_rate_est);
 
+static void
+__gnet_stats_copy_queue_cpu(struct gnet_stats_queue *qstats,
+                           const struct gnet_stats_queue __percpu *q)
+{
+       int i;
+
+       for_each_possible_cpu(i) {
+               const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
+
+               qstats->qlen = 0;
+               qstats->backlog += qcpu->backlog;
+               qstats->drops += qcpu->drops;
+               qstats->requeues += qcpu->requeues;
+               qstats->overlimits += qcpu->overlimits;
+       }
+}
+
+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)
+{
+       if (cpu) {
+               __gnet_stats_copy_queue_cpu(qstats, cpu);
+       } else {
+               qstats->qlen = q->qlen;
+               qstats->backlog = q->backlog;
+               qstats->drops = q->drops;
+               qstats->requeues = q->requeues;
+               qstats->overlimits = q->overlimits;
+       }
+
+       qstats->qlen = qlen;
+}
+
 /**
  * gnet_stats_copy_queue - copy queue statistics into statistics TLV
  * @d: dumping handle
+ * @cpu_q: per cpu queue statistics
  * @q: queue statistics
  * @qlen: queue length statistics
  *
  * Appends the queue statistics to the top level TLV created by
- * gnet_stats_start_copy().
+ * gnet_stats_start_copy(). Using per cpu queue statistics if
+ * they are available.
  *
  * Returns 0 on success or -1 with the statistic lock released
  * if the room in the socket buffer was not sufficient.
  */
 int
 gnet_stats_copy_queue(struct gnet_dump *d,
+                     struct gnet_stats_queue __percpu *cpu_q,
                      struct gnet_stats_queue *q, __u32 qlen)
 {
-       q->qlen = qlen;
+       struct gnet_stats_queue qstats = {0};
+
+       __gnet_stats_copy_queue(&qstats, cpu_q, q, qlen);
 
        if (d->compat_tc_stats) {
-               d->tc_stats.drops = q->drops;
-               d->tc_stats.qlen = q->qlen;
-               d->tc_stats.backlog = q->backlog;
-               d->tc_stats.overlimits = q->overlimits;
+               d->tc_stats.drops = qstats.drops;
+               d->tc_stats.qlen = qstats.qlen;
+               d->tc_stats.backlog = qstats.backlog;
+               d->tc_stats.overlimits = qstats.overlimits;
        }
 
        if (d->tail)
-               return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q));
+               return gnet_stats_copy(d, TCA_STATS_QUEUE,
+                                      &qstats, sizeof(qstats));
 
        return 0;
 }

diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 2e13409..3d43e49 100644 (file)
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -623,7 +623,7 @@ int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *a,
        if (gnet_stats_copy_basic(&d, NULL, &p->tcfc_bstats) < 0 ||
            gnet_stats_copy_rate_est(&d, &p->tcfc_bstats,
                                     &p->tcfc_rate_est) < 0 ||
-           gnet_stats_copy_queue(&d,
+           gnet_stats_copy_queue(&d, NULL,
                                  &p->tcfc_qstats,
                                  p->tcfc_qstats.qlen) < 0)
                goto errout;

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index ca00ea8..aa83295 100644 (file)
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -947,6 +947,10 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
                                alloc_percpu(struct gnet_stats_basic_cpu);
                        if (!sch->cpu_bstats)
                                goto err_out4;
+
+                       sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
+                       if (!sch->cpu_qstats)
+                               goto err_out4;
                }
 
                if (tca[TCA_STAB]) {
@@ -995,6 +999,7 @@ err_out:
 
 err_out4:
        free_percpu(sch->cpu_bstats);
+       free_percpu(sch->cpu_qstats);
        /*
         * Any broken qdiscs that would require a ops->reset() here?
         * The qdisc was never in action so it shouldn't be necessary.
@@ -1313,6 +1318,7 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
                         u32 portid, u32 seq, u16 flags, int event)
 {
        struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
+       struct gnet_stats_queue __percpu *cpu_qstats = NULL;
        struct tcmsg *tcm;
        struct nlmsghdr  *nlh;
        unsigned char *b = skb_tail_pointer(skb);
@@ -1349,12 +1355,14 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
        if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
                goto nla_put_failure;
 
-       if (qdisc_is_percpu_stats(q))
+       if (qdisc_is_percpu_stats(q)) {
                cpu_bstats = q->cpu_bstats;
+               cpu_qstats = q->cpu_qstats;
+       }
 
        if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats) < 0 ||
            gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 ||
-           gnet_stats_copy_queue(&d, &q->qstats, qlen) < 0)
+           gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
                goto nla_put_failure;
 
        if (gnet_stats_finish_copy(&d) < 0)

diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index c145eb6..e3e2cc5 100644 (file)
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -638,7 +638,7 @@ atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
        struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 
        if (gnet_stats_copy_basic(d, NULL, &flow->bstats) < 0 ||
-           gnet_stats_copy_queue(d, &flow->qstats, flow->q->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
                return -1;
 
        return 0;

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index c610081..beeb75f 100644 (file)
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1602,7 +1602,7 @@ cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 
        if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
            gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
-           gnet_stats_copy_queue(d, &cl->qstats, cl->q->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &cl->qstats, cl->q->q.qlen) < 0)
                return -1;
 
        return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats));

diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 5835a93..3387060 100644 (file)
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -284,7 +284,7 @@ static int drr_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 
        if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
            gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
-           gnet_stats_copy_queue(d, &cl->qdisc->qstats, qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &cl->qdisc->qstats, qlen) < 0)
                return -1;
 
        return gnet_stats_copy_app(d, &xstats, sizeof(xstats));

diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
index 226d735..b9ca32e 100644 (file)
--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -550,7 +550,7 @@ static int fq_codel_dump_class_stats(struct Qdisc *sch, unsigned long cl,
                qs.backlog = q->backlogs[idx];
                qs.drops = flow->dropped;
        }
-       if (gnet_stats_copy_queue(d, &qs, 0) < 0)
+       if (gnet_stats_copy_queue(d, NULL, &qs, 0) < 0)
                return -1;
        if (idx < q->flows_cnt)
                return gnet_stats_copy_app(d, &xstats, sizeof(xstats));

diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index d364acb..e6c7416 100644 (file)
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1378,7 +1378,7 @@ hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 
        if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
            gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
-           gnet_stats_copy_queue(d, &cl->qstats, cl->qdisc->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &cl->qstats, cl->qdisc->q.qlen) < 0)
                return -1;
 
        return gnet_stats_copy_app(d, &xstats, sizeof(xstats));

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 3a691fd..f1acb0f 100644 (file)
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1147,7 +1147,7 @@ htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)
 
        if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
            gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 ||
-           gnet_stats_copy_queue(d, &cl->qstats, qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &cl->qstats, qlen) < 0)
                return -1;
 
        return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats));

diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index 6416a69..f3cbaec 100644 (file)
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -200,7 +200,7 @@ static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
 
        sch = dev_queue->qdisc_sleeping;
        if (gnet_stats_copy_basic(d, NULL, &sch->bstats) < 0 ||
-           gnet_stats_copy_queue(d, &sch->qstats, sch->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0)
                return -1;
        return 0;
 }

diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index 03dbeb5..3811a74 100644 (file)
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -356,14 +356,15 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
                /* Reclaim root sleeping lock before completing stats */
                spin_lock_bh(d->lock);
                if (gnet_stats_copy_basic(d, NULL, &bstats) < 0 ||
-                   gnet_stats_copy_queue(d, &qstats, qlen) < 0)
+                   gnet_stats_copy_queue(d, NULL, &qstats, qlen) < 0)
                        return -1;
        } else {
                struct netdev_queue *dev_queue = mqprio_queue_get(sch, cl);
 
                sch = dev_queue->qdisc_sleeping;
                if (gnet_stats_copy_basic(d, NULL, &sch->bstats) < 0 ||
-                   gnet_stats_copy_queue(d, &sch->qstats, sch->q.qlen) < 0)
+                   gnet_stats_copy_queue(d, NULL,
+                                         &sch->qstats, sch->q.qlen) < 0)
                        return -1;
        }
        return 0;

diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index 53357b3..42dd218 100644 (file)
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -361,7 +361,7 @@ static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
 
        cl_q = q->queues[cl - 1];
        if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 ||
-           gnet_stats_copy_queue(d, &cl_q->qstats, cl_q->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
                return -1;
 
        return 0;

diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 4644f55..8e5cd34 100644 (file)
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -325,7 +325,7 @@ static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
 
        cl_q = q->queues[cl - 1];
        if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats) < 0 ||
-           gnet_stats_copy_queue(d, &cl_q->qstats, cl_q->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL, &cl_q->qstats, cl_q->q.qlen) < 0)
                return -1;
 
        return 0;

diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 66df9d9..3ec7e88 100644 (file)
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -670,7 +670,8 @@ static int qfq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 
        if (gnet_stats_copy_basic(d, NULL, &cl->bstats) < 0 ||
            gnet_stats_copy_rate_est(d, &cl->bstats, &cl->rate_est) < 0 ||
-           gnet_stats_copy_queue(d, &cl->qdisc->qstats, cl->qdisc->q.qlen) < 0)
+           gnet_stats_copy_queue(d, NULL,
+                                 &cl->qdisc->qstats, cl->qdisc->q.qlen) < 0)
                return -1;
 
        return gnet_stats_copy_app(d, &xstats, sizeof(xstats));

diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index d4afcbc..b877140 100644 (file)
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -871,7 +871,7 @@ static int sfq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
                qs.qlen = slot->qlen;
                qs.backlog = slot->backlog;
        }
-       if (gnet_stats_copy_queue(d, &qs, qs.qlen) < 0)
+       if (gnet_stats_copy_queue(d, NULL, &qs, qs.qlen) < 0)
                return -1;
        return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
 }