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Message-Id: <20211016084910.4029084-10-bigeasy@linutronix.de>
Date: Sat, 16 Oct 2021 10:49:10 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
"Ahmed S. Darwish" <a.darwish@...utronix.de>,
Eric Dumazet <edumazet@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH net-next 9/9] net: sched: Remove Qdisc::running sequence counter
From: "Ahmed S. Darwish" <a.darwish@...utronix.de>
The Qdisc::running sequence counter has two uses:
1. Reliably reading qdisc's tc statistics while the qdisc is running
(a seqcount read/retry loop at gnet_stats_add_basic()).
2. As a flag, indicating whether the qdisc in question is running
(without any retry loops).
For the first usage, the Qdisc::running sequence counter write section,
qdisc_run_begin() => qdisc_run_end(), covers a much wider area than what
is actually needed: the raw qdisc's bstats update. A u64_stats sync
point was thus introduced (in previous commits) inside the bstats
structure itself. A local u64_stats write section is then started and
stopped for the bstats updates.
Use that u64_stats sync point mechanism for the bstats read/retry loop
at gnet_stats_add_basic().
For the second qdisc->running usage, a __QDISC_STATE_RUNNING bit flag,
accessed with atomic bitops, is sufficient. Using a bit flag instead of
a sequence counter at qdisc_run_begin/end() and qdisc_is_running() leads
to the SMP barriers implicitly added through raw_read_seqcount() and
write_seqcount_begin/end() getting removed. All call sites have been
surveyed though, and no required ordering was identified.
Now that the qdisc->running sequence counter is no longer used, remove
it.
Note, using u64_stats implies no sequence counter protection for 64-bit
architectures. This can lead to the qdisc tc statistics "packets" vs.
"bytes" values getting out of sync on rare occasions. The individual
values will still be valid.
Signed-off-by: Ahmed S. Darwish <a.darwish@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
include/linux/netdevice.h | 4 ----
include/net/gen_stats.h | 19 +++++++--------
include/net/sch_generic.h | 33 +++++++++++---------------
net/core/gen_estimator.c | 16 ++++++++-----
net/core/gen_stats.c | 50 ++++++++++++++++++++++-----------------
net/sched/act_api.c | 9 +++----
net/sched/act_police.c | 2 +-
net/sched/sch_api.c | 16 +++----------
net/sched/sch_atm.c | 3 +--
net/sched/sch_cbq.c | 9 +++----
net/sched/sch_drr.c | 10 +++-----
net/sched/sch_ets.c | 3 +--
net/sched/sch_generic.c | 10 ++------
net/sched/sch_hfsc.c | 8 +++----
net/sched/sch_htb.c | 7 +++---
net/sched/sch_mq.c | 7 +++---
net/sched/sch_mqprio.c | 14 +++++------
net/sched/sch_multiq.c | 3 +--
net/sched/sch_prio.c | 4 ++--
net/sched/sch_qfq.c | 7 +++---
net/sched/sch_taprio.c | 2 +-
21 files changed, 102 insertions(+), 134 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 173984414f387..f9cd6fea213f3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1916,7 +1916,6 @@ enum netdev_ml_priv_type {
* @sfp_bus: attached &struct sfp_bus structure.
*
* @qdisc_tx_busylock: lockdep class annotating Qdisc->busylock spinlock
- * @qdisc_running_key: lockdep class annotating Qdisc->running seqcount
*
* @proto_down: protocol port state information can be sent to the
* switch driver and used to set the phys state of the
@@ -2250,7 +2249,6 @@ struct net_device {
struct phy_device *phydev;
struct sfp_bus *sfp_bus;
struct lock_class_key *qdisc_tx_busylock;
- struct lock_class_key *qdisc_running_key;
bool proto_down;
unsigned wol_enabled:1;
unsigned threaded:1;
@@ -2360,13 +2358,11 @@ static inline void netdev_for_each_tx_queue(struct net_device *dev,
#define netdev_lockdep_set_classes(dev) \
{ \
static struct lock_class_key qdisc_tx_busylock_key; \
- static struct lock_class_key qdisc_running_key; \
static struct lock_class_key qdisc_xmit_lock_key; \
static struct lock_class_key dev_addr_list_lock_key; \
unsigned int i; \
\
(dev)->qdisc_tx_busylock = &qdisc_tx_busylock_key; \
- (dev)->qdisc_running_key = &qdisc_running_key; \
lockdep_set_class(&(dev)->addr_list_lock, \
&dev_addr_list_lock_key); \
for (i = 0; i < (dev)->num_tx_queues; i++) \
diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index 52b87588f467b..7aa2b8e1fb298 100644
--- a/include/net/gen_stats.h
+++ b/include/net/gen_stats.h
@@ -46,18 +46,15 @@ int gnet_stats_start_copy_compat(struct sk_buff *skb, int type,
spinlock_t *lock, struct gnet_dump *d,
int padattr);
-int gnet_stats_copy_basic(const seqcount_t *running,
- struct gnet_dump *d,
+int gnet_stats_copy_basic(struct gnet_dump *d,
struct gnet_stats_basic_sync __percpu *cpu,
- struct gnet_stats_basic_sync *b);
-void gnet_stats_add_basic(const seqcount_t *running,
- struct gnet_stats_basic_sync *bstats,
+ struct gnet_stats_basic_sync *b, bool running);
+void gnet_stats_add_basic(struct gnet_stats_basic_sync *bstats,
struct gnet_stats_basic_sync __percpu *cpu,
- struct gnet_stats_basic_sync *b);
-int gnet_stats_copy_basic_hw(const seqcount_t *running,
- struct gnet_dump *d,
+ struct gnet_stats_basic_sync *b, bool running);
+int gnet_stats_copy_basic_hw(struct gnet_dump *d,
struct gnet_stats_basic_sync __percpu *cpu,
- struct gnet_stats_basic_sync *b);
+ struct gnet_stats_basic_sync *b, bool running);
int gnet_stats_copy_rate_est(struct gnet_dump *d,
struct net_rate_estimator __rcu **ptr);
int gnet_stats_copy_queue(struct gnet_dump *d,
@@ -74,13 +71,13 @@ int gen_new_estimator(struct gnet_stats_basic_sync *bstats,
struct gnet_stats_basic_sync __percpu *cpu_bstats,
struct net_rate_estimator __rcu **rate_est,
spinlock_t *lock,
- seqcount_t *running, struct nlattr *opt);
+ bool running, struct nlattr *opt);
void gen_kill_estimator(struct net_rate_estimator __rcu **ptr);
int gen_replace_estimator(struct gnet_stats_basic_sync *bstats,
struct gnet_stats_basic_sync __percpu *cpu_bstats,
struct net_rate_estimator __rcu **ptr,
spinlock_t *lock,
- seqcount_t *running, struct nlattr *opt);
+ bool running, struct nlattr *opt);
bool gen_estimator_active(struct net_rate_estimator __rcu **ptr);
bool gen_estimator_read(struct net_rate_estimator __rcu **ptr,
struct gnet_stats_rate_est64 *sample);
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 7882e3aa64482..baad2ab4d971c 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -38,6 +38,10 @@ enum qdisc_state_t {
__QDISC_STATE_DEACTIVATED,
__QDISC_STATE_MISSED,
__QDISC_STATE_DRAINING,
+ /* Only for !TCQ_F_NOLOCK qdisc. Never access it directly.
+ * Use qdisc_run_begin/end() or qdisc_is_running() instead.
+ */
+ __QDISC_STATE_RUNNING,
};
#define QDISC_STATE_MISSED BIT(__QDISC_STATE_MISSED)
@@ -108,7 +112,6 @@ struct Qdisc {
struct sk_buff_head gso_skb ____cacheline_aligned_in_smp;
struct qdisc_skb_head q;
struct gnet_stats_basic_sync bstats;
- seqcount_t running;
struct gnet_stats_queue qstats;
unsigned long state;
struct Qdisc *next_sched;
@@ -143,11 +146,15 @@ static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
return NULL;
}
+/* For !TCQ_F_NOLOCK qdisc: callers must either call this within a qdisc
+ * root_lock section, or provide their own memory barriers -- ordering
+ * against qdisc_run_begin/end() atomic bit operations.
+ */
static inline bool qdisc_is_running(struct Qdisc *qdisc)
{
if (qdisc->flags & TCQ_F_NOLOCK)
return spin_is_locked(&qdisc->seqlock);
- return (raw_read_seqcount(&qdisc->running) & 1) ? true : false;
+ return test_bit(__QDISC_STATE_RUNNING, &qdisc->state);
}
static inline bool nolock_qdisc_is_empty(const struct Qdisc *qdisc)
@@ -167,6 +174,9 @@ static inline bool qdisc_is_empty(const struct Qdisc *qdisc)
return !READ_ONCE(qdisc->q.qlen);
}
+/* For !TCQ_F_NOLOCK qdisc, qdisc_run_begin/end() must be invoked with
+ * the qdisc root lock acquired.
+ */
static inline bool qdisc_run_begin(struct Qdisc *qdisc)
{
if (qdisc->flags & TCQ_F_NOLOCK) {
@@ -206,15 +216,8 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc)
* after it releases the lock at the end of qdisc_run_end().
*/
return spin_trylock(&qdisc->seqlock);
- } else if (qdisc_is_running(qdisc)) {
- return false;
}
- /* Variant of write_seqcount_begin() telling lockdep a trylock
- * was attempted.
- */
- raw_write_seqcount_begin(&qdisc->running);
- seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
- return true;
+ return test_and_set_bit(__QDISC_STATE_RUNNING, &qdisc->state);
}
static inline void qdisc_run_end(struct Qdisc *qdisc)
@@ -226,7 +229,7 @@ static inline void qdisc_run_end(struct Qdisc *qdisc)
&qdisc->state)))
__netif_schedule(qdisc);
} else {
- write_seqcount_end(&qdisc->running);
+ clear_bit(__QDISC_STATE_RUNNING, &qdisc->state);
}
}
@@ -592,14 +595,6 @@ static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
return qdisc_lock(root);
}
-static inline seqcount_t *qdisc_root_sleeping_running(const struct Qdisc *qdisc)
-{
- struct Qdisc *root = qdisc_root_sleeping(qdisc);
-
- ASSERT_RTNL();
- return &root->running;
-}
-
static inline struct net_device *qdisc_dev(const struct Qdisc *qdisc)
{
return qdisc->dev_queue->dev;
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index a73ad0bf324c4..4fcbdd71c59fa 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -42,7 +42,7 @@
struct net_rate_estimator {
struct gnet_stats_basic_sync *bstats;
spinlock_t *stats_lock;
- seqcount_t *running;
+ bool running;
struct gnet_stats_basic_sync __percpu *cpu_bstats;
u8 ewma_log;
u8 intvl_log; /* period : (250ms << intvl_log) */
@@ -66,7 +66,7 @@ static void est_fetch_counters(struct net_rate_estimator *e,
if (e->stats_lock)
spin_lock(e->stats_lock);
- gnet_stats_add_basic(e->running, b, e->cpu_bstats, e->bstats);
+ gnet_stats_add_basic(b, e->cpu_bstats, e->bstats, e->running);
if (e->stats_lock)
spin_unlock(e->stats_lock);
@@ -113,7 +113,9 @@ static void est_timer(struct timer_list *t)
* @cpu_bstats: bstats per cpu
* @rate_est: rate estimator statistics
* @lock: lock for statistics and control path
- * @running: qdisc running seqcount
+ * @running: true if @bstats represents a running qdisc, thus @bstats'
+ * internal values might change during basic reads. Only used
+ * if @bstats_cpu is NULL
* @opt: rate estimator configuration TLV
*
* Creates a new rate estimator with &bstats as source and &rate_est
@@ -129,7 +131,7 @@ int gen_new_estimator(struct gnet_stats_basic_sync *bstats,
struct gnet_stats_basic_sync __percpu *cpu_bstats,
struct net_rate_estimator __rcu **rate_est,
spinlock_t *lock,
- seqcount_t *running,
+ bool running,
struct nlattr *opt)
{
struct gnet_estimator *parm = nla_data(opt);
@@ -218,7 +220,9 @@ EXPORT_SYMBOL(gen_kill_estimator);
* @cpu_bstats: bstats per cpu
* @rate_est: rate estimator statistics
* @lock: lock for statistics and control path
- * @running: qdisc running seqcount (might be NULL)
+ * @running: true if @bstats represents a running qdisc, thus @bstats'
+ * internal values might change during basic reads. Only used
+ * if @cpu_bstats is NULL
* @opt: rate estimator configuration TLV
*
* Replaces the configuration of a rate estimator by calling
@@ -230,7 +234,7 @@ int gen_replace_estimator(struct gnet_stats_basic_sync *bstats,
struct gnet_stats_basic_sync __percpu *cpu_bstats,
struct net_rate_estimator __rcu **rate_est,
spinlock_t *lock,
- seqcount_t *running, struct nlattr *opt)
+ bool running, struct nlattr *opt)
{
return gen_new_estimator(bstats, cpu_bstats, rate_est,
lock, running, opt);
diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index 5f57f761def69..5516ea0d5da0b 100644
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -146,42 +146,42 @@ static void gnet_stats_add_basic_cpu(struct gnet_stats_basic_sync *bstats,
_bstats_update(bstats, t_bytes, t_packets);
}
-void gnet_stats_add_basic(const seqcount_t *running,
- struct gnet_stats_basic_sync *bstats,
+void gnet_stats_add_basic(struct gnet_stats_basic_sync *bstats,
struct gnet_stats_basic_sync __percpu *cpu,
- struct gnet_stats_basic_sync *b)
+ struct gnet_stats_basic_sync *b, bool running)
{
- unsigned int seq;
+ unsigned int start;
u64 bytes = 0;
u64 packets = 0;
+ WARN_ON_ONCE((cpu || running) && !in_task());
+
if (cpu) {
gnet_stats_add_basic_cpu(bstats, cpu);
return;
}
do {
if (running)
- seq = read_seqcount_begin(running);
+ start = u64_stats_fetch_begin_irq(&b->syncp);
bytes = u64_stats_read(&b->bytes);
packets = u64_stats_read(&b->packets);
- } while (running && read_seqcount_retry(running, seq));
+ } while (running && u64_stats_fetch_retry_irq(&b->syncp, start));
_bstats_update(bstats, bytes, packets);
}
EXPORT_SYMBOL(gnet_stats_add_basic);
static int
-___gnet_stats_copy_basic(const seqcount_t *running,
- struct gnet_dump *d,
+___gnet_stats_copy_basic(struct gnet_dump *d,
struct gnet_stats_basic_sync __percpu *cpu,
struct gnet_stats_basic_sync *b,
- int type)
+ int type, bool running)
{
struct gnet_stats_basic_sync bstats;
u64 bstats_bytes, bstats_packets;
gnet_stats_basic_sync_init(&bstats);
- gnet_stats_add_basic(running, &bstats, cpu, b);
+ gnet_stats_add_basic(&bstats, cpu, b, running);
bstats_bytes = u64_stats_read(&bstats.bytes);
bstats_packets = u64_stats_read(&bstats.packets);
@@ -210,10 +210,14 @@ ___gnet_stats_copy_basic(const seqcount_t *running,
/**
* gnet_stats_copy_basic - copy basic statistics into statistic TLV
- * @running: seqcount_t pointer
* @d: dumping handle
* @cpu: copy statistic per cpu
* @b: basic statistics
+ * @running: true if @b represents a running qdisc, thus @b's
+ * internal values might change during basic reads.
+ * Only used if @cpu is NULL
+ *
+ * Context: task; must not be run from IRQ or BH contexts
*
* Appends the basic statistics to the top level TLV created by
* gnet_stats_start_copy().
@@ -222,22 +226,25 @@ ___gnet_stats_copy_basic(const seqcount_t *running,
* if the room in the socket buffer was not sufficient.
*/
int
-gnet_stats_copy_basic(const seqcount_t *running,
- struct gnet_dump *d,
+gnet_stats_copy_basic(struct gnet_dump *d,
struct gnet_stats_basic_sync __percpu *cpu,
- struct gnet_stats_basic_sync *b)
+ struct gnet_stats_basic_sync *b,
+ bool running)
{
- return ___gnet_stats_copy_basic(running, d, cpu, b,
- TCA_STATS_BASIC);
+ return ___gnet_stats_copy_basic(d, cpu, b, TCA_STATS_BASIC, running);
}
EXPORT_SYMBOL(gnet_stats_copy_basic);
/**
* gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV
- * @running: seqcount_t pointer
* @d: dumping handle
* @cpu: copy statistic per cpu
* @b: basic statistics
+ * @running: true if @b represents a running qdisc, thus @b's
+ * internal values might change during basic reads.
+ * Only used if @cpu is NULL
+ *
+ * Context: task; must not be run from IRQ or BH contexts
*
* Appends the basic statistics to the top level TLV created by
* gnet_stats_start_copy().
@@ -246,13 +253,12 @@ EXPORT_SYMBOL(gnet_stats_copy_basic);
* if the room in the socket buffer was not sufficient.
*/
int
-gnet_stats_copy_basic_hw(const seqcount_t *running,
- struct gnet_dump *d,
+gnet_stats_copy_basic_hw(struct gnet_dump *d,
struct gnet_stats_basic_sync __percpu *cpu,
- struct gnet_stats_basic_sync *b)
+ struct gnet_stats_basic_sync *b,
+ bool running)
{
- return ___gnet_stats_copy_basic(running, d, cpu, b,
- TCA_STATS_BASIC_HW);
+ return ___gnet_stats_copy_basic(d, cpu, b, TCA_STATS_BASIC_HW, running);
}
EXPORT_SYMBOL(gnet_stats_copy_basic_hw);
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 585829ffa0c4c..4133b8ea5a57a 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -501,7 +501,7 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
if (est) {
err = gen_new_estimator(&p->tcfa_bstats, p->cpu_bstats,
&p->tcfa_rate_est,
- &p->tcfa_lock, NULL, est);
+ &p->tcfa_lock, false, est);
if (err)
goto err4;
}
@@ -1173,9 +1173,10 @@ int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
if (err < 0)
goto errout;
- if (gnet_stats_copy_basic(NULL, &d, p->cpu_bstats, &p->tcfa_bstats) < 0 ||
- gnet_stats_copy_basic_hw(NULL, &d, p->cpu_bstats_hw,
- &p->tcfa_bstats_hw) < 0 ||
+ if (gnet_stats_copy_basic(&d, p->cpu_bstats,
+ &p->tcfa_bstats, false) < 0 ||
+ gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
+ &p->tcfa_bstats_hw, false) < 0 ||
gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
gnet_stats_copy_queue(&d, p->cpu_qstats,
&p->tcfa_qstats,
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index c9383805222df..9e77ba8401e53 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -125,7 +125,7 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
police->common.cpu_bstats,
&police->tcf_rate_est,
&police->tcf_lock,
- NULL, est);
+ false, est);
if (err)
goto failure;
} else if (tb[TCA_POLICE_AVRATE] &&
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 70f006cbf2126..efcd0b5e9a323 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -943,8 +943,7 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
cpu_qstats = q->cpu_qstats;
}
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
- &d, cpu_bstats, &q->bstats) < 0 ||
+ if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats, true) < 0 ||
gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
goto nla_put_failure;
@@ -1265,26 +1264,17 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
rcu_assign_pointer(sch->stab, stab);
}
if (tca[TCA_RATE]) {
- seqcount_t *running;
-
err = -EOPNOTSUPP;
if (sch->flags & TCQ_F_MQROOT) {
NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
goto err_out4;
}
- if (sch->parent != TC_H_ROOT &&
- !(sch->flags & TCQ_F_INGRESS) &&
- (!p || !(p->flags & TCQ_F_MQROOT)))
- running = qdisc_root_sleeping_running(sch);
- else
- running = &sch->running;
-
err = gen_new_estimator(&sch->bstats,
sch->cpu_bstats,
&sch->rate_est,
NULL,
- running,
+ true,
tca[TCA_RATE]);
if (err) {
NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
@@ -1360,7 +1350,7 @@ static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
sch->cpu_bstats,
&sch->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE]);
}
out:
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index fbfe4ce9497b5..4c8e994cf0a53 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -653,8 +653,7 @@ 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(qdisc_root_sleeping_running(sch),
- d, NULL, &flow->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &flow->bstats, true) < 0 ||
gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
return -1;
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index f0b1282fae111..02d9f0dfe3564 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1383,8 +1383,7 @@ cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
if (cl->undertime != PSCHED_PASTPERFECT)
cl->xstats.undertime = cl->undertime - q->now;
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
gnet_stats_copy_queue(d, NULL, &cl->qstats, qlen) < 0)
return -1;
@@ -1518,7 +1517,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
err = gen_replace_estimator(&cl->bstats, NULL,
&cl->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE]);
if (err) {
NL_SET_ERR_MSG(extack, "Failed to replace specified rate estimator");
@@ -1619,9 +1618,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
if (tca[TCA_RATE]) {
err = gen_new_estimator(&cl->bstats, NULL, &cl->rate_est,
- NULL,
- qdisc_root_sleeping_running(sch),
- tca[TCA_RATE]);
+ NULL, true, tca[TCA_RATE]);
if (err) {
NL_SET_ERR_MSG(extack, "Couldn't create new estimator");
tcf_block_put(cl->block);
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 7243617a3595f..18e4f7a0b2912 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -85,8 +85,7 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
if (tca[TCA_RATE]) {
err = gen_replace_estimator(&cl->bstats, NULL,
&cl->rate_est,
- NULL,
- qdisc_root_sleeping_running(sch),
+ NULL, true,
tca[TCA_RATE]);
if (err) {
NL_SET_ERR_MSG(extack, "Failed to replace estimator");
@@ -119,9 +118,7 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
if (tca[TCA_RATE]) {
err = gen_replace_estimator(&cl->bstats, NULL, &cl->rate_est,
- NULL,
- qdisc_root_sleeping_running(sch),
- tca[TCA_RATE]);
+ NULL, true, tca[TCA_RATE]);
if (err) {
NL_SET_ERR_MSG(extack, "Failed to replace estimator");
qdisc_put(cl->qdisc);
@@ -268,8 +265,7 @@ static int drr_dump_class_stats(struct Qdisc *sch, unsigned long arg,
if (qlen)
xstats.deficit = cl->deficit;
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
gnet_stats_copy_queue(d, cl_q->cpu_qstats, &cl_q->qstats, qlen) < 0)
return -1;
diff --git a/net/sched/sch_ets.c b/net/sched/sch_ets.c
index af56d155e7fca..0eae9ff5edf6f 100644
--- a/net/sched/sch_ets.c
+++ b/net/sched/sch_ets.c
@@ -325,8 +325,7 @@ static int ets_class_dump_stats(struct Qdisc *sch, unsigned long arg,
struct ets_class *cl = ets_class_from_arg(sch, arg);
struct Qdisc *cl_q = cl->qdisc;
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl_q->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &cl_q->bstats, true) < 0 ||
qdisc_qstats_copy(d, cl_q) < 0)
return -1;
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 989186e7f1a02..b0ff0dff27734 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -304,8 +304,8 @@ static struct sk_buff *dequeue_skb(struct Qdisc *q, bool *validate,
/*
* Transmit possibly several skbs, and handle the return status as
- * required. Owning running seqcount bit guarantees that
- * only one CPU can execute this function.
+ * required. Owning qdisc running bit guarantees that only one CPU
+ * can execute this function.
*
* Returns to the caller:
* false - hardware queue frozen backoff
@@ -606,7 +606,6 @@ struct Qdisc noop_qdisc = {
.ops = &noop_qdisc_ops,
.q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock),
.dev_queue = &noop_netdev_queue,
- .running = SEQCNT_ZERO(noop_qdisc.running),
.busylock = __SPIN_LOCK_UNLOCKED(noop_qdisc.busylock),
.gso_skb = {
.next = (struct sk_buff *)&noop_qdisc.gso_skb,
@@ -867,7 +866,6 @@ struct Qdisc_ops pfifo_fast_ops __read_mostly = {
EXPORT_SYMBOL(pfifo_fast_ops);
static struct lock_class_key qdisc_tx_busylock;
-static struct lock_class_key qdisc_running_key;
struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
const struct Qdisc_ops *ops,
@@ -917,10 +915,6 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
lockdep_set_class(&sch->seqlock,
dev->qdisc_tx_busylock ?: &qdisc_tx_busylock);
- seqcount_init(&sch->running);
- lockdep_set_class(&sch->running,
- dev->qdisc_running_key ?: &qdisc_running_key);
-
sch->ops = ops;
sch->flags = ops->static_flags;
sch->enqueue = ops->enqueue;
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 181c2905ff983..d3979a6000e7d 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -965,7 +965,7 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
err = gen_replace_estimator(&cl->bstats, NULL,
&cl->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE]);
if (err)
return err;
@@ -1033,9 +1033,7 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
if (tca[TCA_RATE]) {
err = gen_new_estimator(&cl->bstats, NULL, &cl->rate_est,
- NULL,
- qdisc_root_sleeping_running(sch),
- tca[TCA_RATE]);
+ NULL, true, tca[TCA_RATE]);
if (err) {
tcf_block_put(cl->block);
kfree(cl);
@@ -1328,7 +1326,7 @@ hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
xstats.work = cl->cl_total;
xstats.rtwork = cl->cl_cumul;
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), d, NULL, &cl->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
gnet_stats_copy_queue(d, NULL, &cl->qstats, qlen) < 0)
return -1;
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index adceb9e210f61..cf1d45db4e84b 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1368,8 +1368,7 @@ htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)
}
}
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
gnet_stats_copy_queue(d, NULL, &qs, qlen) < 0)
return -1;
@@ -1865,7 +1864,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
err = gen_new_estimator(&cl->bstats, NULL,
&cl->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE] ? : &est.nla);
if (err)
goto err_block_put;
@@ -1991,7 +1990,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
err = gen_replace_estimator(&cl->bstats, NULL,
&cl->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE]);
if (err)
return err;
diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index cedd0b3ef9cfb..83d2e54bf303a 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -144,8 +144,8 @@ static int mq_dump(struct Qdisc *sch, struct sk_buff *skb)
qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
spin_lock_bh(qdisc_lock(qdisc));
- gnet_stats_add_basic(NULL, &sch->bstats, qdisc->cpu_bstats,
- &qdisc->bstats);
+ gnet_stats_add_basic(&sch->bstats, qdisc->cpu_bstats,
+ &qdisc->bstats, false);
gnet_stats_add_queue(&sch->qstats, qdisc->cpu_qstats,
&qdisc->qstats);
sch->q.qlen += qdisc_qlen(qdisc);
@@ -231,8 +231,7 @@ static int mq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
struct netdev_queue *dev_queue = mq_queue_get(sch, cl);
sch = dev_queue->qdisc_sleeping;
- if (gnet_stats_copy_basic(&sch->running, d, sch->cpu_bstats,
- &sch->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, sch->cpu_bstats, &sch->bstats, true) < 0 ||
qdisc_qstats_copy(d, sch) < 0)
return -1;
return 0;
diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index 3f7f756f92ca3..b29f3453c6eaf 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -402,8 +402,8 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
qdisc = netdev_get_tx_queue(dev, ntx)->qdisc_sleeping;
spin_lock_bh(qdisc_lock(qdisc));
- gnet_stats_add_basic(NULL, &sch->bstats, qdisc->cpu_bstats,
- &qdisc->bstats);
+ gnet_stats_add_basic(&sch->bstats, qdisc->cpu_bstats,
+ &qdisc->bstats, false);
gnet_stats_add_queue(&sch->qstats, qdisc->cpu_qstats,
&qdisc->qstats);
sch->q.qlen += qdisc_qlen(qdisc);
@@ -519,8 +519,8 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
spin_lock_bh(qdisc_lock(qdisc));
- gnet_stats_add_basic(NULL, &bstats, qdisc->cpu_bstats,
- &qdisc->bstats);
+ gnet_stats_add_basic(&bstats, qdisc->cpu_bstats,
+ &qdisc->bstats, false);
gnet_stats_add_queue(&qstats, qdisc->cpu_qstats,
&qdisc->qstats);
sch->q.qlen += qdisc_qlen(qdisc);
@@ -532,15 +532,15 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
/* Reclaim root sleeping lock before completing stats */
if (d->lock)
spin_lock_bh(d->lock);
- if (gnet_stats_copy_basic(NULL, d, NULL, &bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &bstats, false) < 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(qdisc_root_sleeping_running(sch), d,
- sch->cpu_bstats, &sch->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, sch->cpu_bstats,
+ &sch->bstats, true) < 0 ||
qdisc_qstats_copy(d, sch) < 0)
return -1;
}
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index e282e7382117a..cd8ab90c4765d 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -338,8 +338,7 @@ static int multiq_dump_class_stats(struct Qdisc *sch, unsigned long cl,
struct Qdisc *cl_q;
cl_q = q->queues[cl - 1];
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, cl_q->cpu_bstats, &cl_q->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, cl_q->cpu_bstats, &cl_q->bstats, true) < 0 ||
qdisc_qstats_copy(d, cl_q) < 0)
return -1;
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 03fdf31ccb6af..3b8d7197c06bf 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -361,8 +361,8 @@ static int prio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
struct Qdisc *cl_q;
cl_q = q->queues[cl - 1];
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, cl_q->cpu_bstats, &cl_q->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, cl_q->cpu_bstats,
+ &cl_q->bstats, true) < 0 ||
qdisc_qstats_copy(d, cl_q) < 0)
return -1;
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index a35200f591a2d..0b7f9ba28deb0 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -451,7 +451,7 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
err = gen_replace_estimator(&cl->bstats, NULL,
&cl->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE]);
if (err)
return err;
@@ -478,7 +478,7 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
err = gen_new_estimator(&cl->bstats, NULL,
&cl->rate_est,
NULL,
- qdisc_root_sleeping_running(sch),
+ true,
tca[TCA_RATE]);
if (err)
goto destroy_class;
@@ -640,8 +640,7 @@ static int qfq_dump_class_stats(struct Qdisc *sch, unsigned long arg,
xstats.weight = cl->agg->class_weight;
xstats.lmax = cl->agg->lmax;
- if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
- d, NULL, &cl->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
qdisc_qstats_copy(d, cl->qdisc) < 0)
return -1;
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index b9fd18d986464..9ab068fa2672b 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -1977,7 +1977,7 @@ static int taprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
struct netdev_queue *dev_queue = taprio_queue_get(sch, cl);
sch = dev_queue->qdisc_sleeping;
- if (gnet_stats_copy_basic(&sch->running, d, NULL, &sch->bstats) < 0 ||
+ if (gnet_stats_copy_basic(d, NULL, &sch->bstats, true) < 0 ||
qdisc_qstats_copy(d, sch) < 0)
return -1;
return 0;
--
2.33.0
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