* [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation
@ 2019-04-08 17:12 Leandro Dorileo
2019-04-08 17:12 ` [PATCH net-next V6 1/2] " Leandro Dorileo
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Leandro Dorileo @ 2019-04-08 17:12 UTC (permalink / raw)
To: netdev
Cc: Jamal Hadi Salim, Cong Wang, Jiri Pirko, David S . Miller,
Vinicius Costa Gomes, f.fainelli, vedang.patel, andre.guedes
This set fixes miscalculations based on invalid link speed values.
Changes in v6:
+ Avoid locking a spinlock while calling __ethtool_get_link_ksettings()
(suggested by: Cong Wang);
Changes in v5:
+ Don't iterate over all the net_device maintained list (suggested by: Florian Fainelli);
Changes in v4:
+ converted pr_info calls to netdev_dbg (suggested by: Florian Fainelli);
Changes in v3:
+ yet pr_info() format warnings;
Changes in v2:
+ fixed pr_info() format both on cbs and taprio patches;
Leandro Dorileo (2):
net/sched: taprio: fix picos_per_byte miscalculation
net/sched: cbs: fix port_rate miscalculation
net/sched/sch_cbs.c | 98 ++++++++++++++++++++++++++++++++++++------
net/sched/sch_taprio.c | 97 ++++++++++++++++++++++++++++++++++-------
2 files changed, 165 insertions(+), 30 deletions(-)
--
2.21.0
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH net-next V6 1/2] net/sched: taprio: fix picos_per_byte miscalculation
2019-04-08 17:12 [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation Leandro Dorileo
@ 2019-04-08 17:12 ` Leandro Dorileo
2019-04-11 3:00 ` kbuild test robot
2019-04-08 17:12 ` [PATCH net-next V6 2/2] net/sched: cbs: fix port_rate miscalculation Leandro Dorileo
2019-04-11 2:28 ` [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation David Miller
2 siblings, 1 reply; 5+ messages in thread
From: Leandro Dorileo @ 2019-04-08 17:12 UTC (permalink / raw)
To: netdev
Cc: Jamal Hadi Salim, Cong Wang, Jiri Pirko, David S . Miller,
Vinicius Costa Gomes, f.fainelli, vedang.patel, andre.guedes
The Time Aware Priority Scheduler is heavily dependent to link speed,
it relies on it to calculate transmission bytes per cycle, we can't
properly calculate the so called budget if the device has failed
to report the link speed.
In that case we can't dequeue packets assuming a wrong budget.
This patch makes sure we fail to dequeue case:
1) __ethtool_get_link_ksettings() reports error or 2) the ethernet
driver failed to set the ksettings' speed value (setting link speed
to SPEED_UNKNOWN).
Additionally we re calculate the budget whenever the link speed is
changed.
Fixes: 5a781ccbd19e4 ("tc: Add support for configuring the taprio scheduler")
Signed-off-by: Leandro Dorileo <leandro.maciel.dorileo@intel.com>
Reviewed-by: Vedang Patel <vedang.patel@intel.com>
---
net/sched/sch_taprio.c | 97 +++++++++++++++++++++++++++++++++++-------
1 file changed, 81 insertions(+), 16 deletions(-)
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 206e4dbed12f..61fd7f57bd40 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -20,6 +20,9 @@
#include <net/pkt_cls.h>
#include <net/sch_generic.h>
+static LIST_HEAD(taprio_list);
+static DEFINE_SPINLOCK(taprio_list_lock);
+
#define TAPRIO_ALL_GATES_OPEN -1
struct sched_entry {
@@ -42,9 +45,9 @@ struct taprio_sched {
struct Qdisc *root;
s64 base_time;
int clockid;
- int picos_per_byte; /* Using picoseconds because for 10Gbps+
- * speeds it's sub-nanoseconds per byte
- */
+ atomic64_t picos_per_byte; /* Using picoseconds because for 10Gbps+
+ * speeds it's sub-nanoseconds per byte
+ */
size_t num_entries;
/* Protects the update side of the RCU protected current_entry */
@@ -53,6 +56,7 @@ struct taprio_sched {
struct list_head entries;
ktime_t (*get_time)(void);
struct hrtimer advance_timer;
+ struct list_head taprio_list;
};
static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch,
@@ -117,7 +121,7 @@ static struct sk_buff *taprio_peek(struct Qdisc *sch)
static inline int length_to_duration(struct taprio_sched *q, int len)
{
- return (len * q->picos_per_byte) / 1000;
+ return (len * atomic64_read(&q->picos_per_byte)) / 1000;
}
static struct sk_buff *taprio_dequeue(struct Qdisc *sch)
@@ -129,6 +133,11 @@ static struct sk_buff *taprio_dequeue(struct Qdisc *sch)
u32 gate_mask;
int i;
+ if (atomic64_read(&q->picos_per_byte) == -1) {
+ WARN_ONCE(1, "taprio: dequeue() called with unknown picos per byte.");
+ return NULL;
+ }
+
rcu_read_lock();
entry = rcu_dereference(q->current_entry);
/* if there's no entry, it means that the schedule didn't
@@ -233,7 +242,7 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer)
next->close_time = close_time;
atomic_set(&next->budget,
- (next->interval * 1000) / q->picos_per_byte);
+ (next->interval * 1000) / atomic64_read(&q->picos_per_byte));
first_run:
rcu_assign_pointer(q->current_entry, next);
@@ -567,7 +576,8 @@ static void taprio_start_sched(struct Qdisc *sch, ktime_t start)
first->close_time = ktime_add_ns(start, first->interval);
atomic_set(&first->budget,
- (first->interval * 1000) / q->picos_per_byte);
+ (first->interval * 1000) /
+ atomic64_read(&q->picos_per_byte));
rcu_assign_pointer(q->current_entry, NULL);
spin_unlock_irqrestore(&q->current_entry_lock, flags);
@@ -575,6 +585,52 @@ static void taprio_start_sched(struct Qdisc *sch, ktime_t start)
hrtimer_start(&q->advance_timer, start, HRTIMER_MODE_ABS);
}
+static void taprio_set_picos_per_byte(struct net_device *dev,
+ struct taprio_sched *q)
+{
+ struct ethtool_link_ksettings ecmd;
+ int picos_per_byte = -1;
+
+ if (!__ethtool_get_link_ksettings(dev, &ecmd) &&
+ ecmd.base.speed != SPEED_UNKNOWN)
+ picos_per_byte = div64_s64(NSEC_PER_SEC * 1000LL * 8,
+ ecmd.base.speed * 1000 * 1000);
+
+ atomic64_set(&q->picos_per_byte, picos_per_byte);
+ netdev_dbg(dev, "taprio: set %s's picos_per_byte to: %lld, linkspeed: %d\n",
+ dev->name, (long long)atomic64_read(&q->picos_per_byte),
+ ecmd.base.speed);
+}
+
+static int taprio_dev_notifier(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct net_device *qdev;
+ struct taprio_sched *q;
+ bool found = false;
+
+ ASSERT_RTNL();
+
+ if (event != NETDEV_UP && event != NETDEV_CHANGE)
+ return NOTIFY_DONE;
+
+ spin_lock(&taprio_list_lock);
+ list_for_each_entry(q, &taprio_list, taprio_list) {
+ qdev = qdisc_dev(q->root);
+ if (qdev == dev) {
+ found = true;
+ break;
+ }
+ }
+ spin_unlock(&taprio_list_lock);
+
+ if (found)
+ taprio_set_picos_per_byte(dev, q);
+
+ return NOTIFY_DONE;
+}
+
static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
@@ -582,9 +638,7 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct tc_mqprio_qopt *mqprio = NULL;
- struct ethtool_link_ksettings ecmd;
int i, err, size;
- s64 link_speed;
ktime_t start;
err = nla_parse_nested(tb, TCA_TAPRIO_ATTR_MAX, opt,
@@ -657,14 +711,7 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
mqprio->prio_tc_map[i]);
}
- if (!__ethtool_get_link_ksettings(dev, &ecmd))
- link_speed = ecmd.base.speed;
- else
- link_speed = SPEED_1000;
-
- q->picos_per_byte = div64_s64(NSEC_PER_SEC * 1000LL * 8,
- link_speed * 1000 * 1000);
-
+ taprio_set_picos_per_byte(dev, q);
start = taprio_get_start_time(sch);
if (!start)
return 0;
@@ -681,6 +728,10 @@ static void taprio_destroy(struct Qdisc *sch)
struct sched_entry *entry, *n;
unsigned int i;
+ spin_lock(&taprio_list_lock);
+ list_del(&q->taprio_list);
+ spin_unlock(&taprio_list_lock);
+
hrtimer_cancel(&q->advance_timer);
if (q->qdiscs) {
@@ -735,6 +786,10 @@ static int taprio_init(struct Qdisc *sch, struct nlattr *opt,
if (!opt)
return -EINVAL;
+ spin_lock(&taprio_list_lock);
+ list_add(&q->taprio_list, &taprio_list);
+ spin_unlock(&taprio_list_lock);
+
return taprio_change(sch, opt, extack);
}
@@ -947,14 +1002,24 @@ static struct Qdisc_ops taprio_qdisc_ops __read_mostly = {
.owner = THIS_MODULE,
};
+static struct notifier_block taprio_device_notifier = {
+ .notifier_call = taprio_dev_notifier,
+};
+
static int __init taprio_module_init(void)
{
+ int err = register_netdevice_notifier(&taprio_device_notifier);
+
+ if (err)
+ return err;
+
return register_qdisc(&taprio_qdisc_ops);
}
static void __exit taprio_module_exit(void)
{
unregister_qdisc(&taprio_qdisc_ops);
+ unregister_netdevice_notifier(&taprio_device_notifier);
}
module_init(taprio_module_init);
--
2.21.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH net-next V6 2/2] net/sched: cbs: fix port_rate miscalculation
2019-04-08 17:12 [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation Leandro Dorileo
2019-04-08 17:12 ` [PATCH net-next V6 1/2] " Leandro Dorileo
@ 2019-04-08 17:12 ` Leandro Dorileo
2019-04-11 2:28 ` [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation David Miller
2 siblings, 0 replies; 5+ messages in thread
From: Leandro Dorileo @ 2019-04-08 17:12 UTC (permalink / raw)
To: netdev
Cc: Jamal Hadi Salim, Cong Wang, Jiri Pirko, David S . Miller,
Vinicius Costa Gomes, f.fainelli, vedang.patel, andre.guedes
The Credit Based Shaper heavily depends on link speed to calculate
the scheduling credits, we can't properly calculate the credits if the
device has failed to report the link speed.
In that case we can't dequeue packets assuming a wrong port rate that will
result into an inconsistent credit distribution.
This patch makes sure we fail to dequeue case:
1) __ethtool_get_link_ksettings() reports error or 2) the ethernet driver
failed to set the ksettings' speed value (setting link speed to
SPEED_UNKNOWN).
Additionally we properly re calculate the port rate whenever the link speed
is changed.
Fixes: 3d0bd028ffb4a ("net/sched: Add support for HW offloading for CBS")
Signed-off-by: Leandro Dorileo <leandro.maciel.dorileo@intel.com>
Reviewed-by: Vedang Patel <vedang.patel@intel.com>
---
net/sched/sch_cbs.c | 98 ++++++++++++++++++++++++++++++++++++++-------
1 file changed, 84 insertions(+), 14 deletions(-)
diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index c6a502933fe7..f68fd7a0e038 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -61,16 +61,20 @@
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
+#include <net/netevent.h>
#include <net/netlink.h>
#include <net/sch_generic.h>
#include <net/pkt_sched.h>
+static LIST_HEAD(cbs_list);
+static DEFINE_SPINLOCK(cbs_list_lock);
+
#define BYTES_PER_KBIT (1000LL / 8)
struct cbs_sched_data {
bool offload;
int queue;
- s64 port_rate; /* in bytes/s */
+ atomic64_t port_rate; /* in bytes/s */
s64 last; /* timestamp in ns */
s64 credits; /* in bytes */
s32 locredit; /* in bytes */
@@ -82,6 +86,7 @@ struct cbs_sched_data {
struct sk_buff **to_free);
struct sk_buff *(*dequeue)(struct Qdisc *sch);
struct Qdisc *qdisc;
+ struct list_head cbs_list;
};
static int cbs_child_enqueue(struct sk_buff *skb, struct Qdisc *sch,
@@ -181,6 +186,11 @@ static struct sk_buff *cbs_dequeue_soft(struct Qdisc *sch)
s64 credits;
int len;
+ if (atomic64_read(&q->port_rate) == -1) {
+ WARN_ONCE(1, "cbs: dequeue() called with unknown port rate.");
+ return NULL;
+ }
+
if (q->credits < 0) {
credits = timediff_to_credits(now - q->last, q->idleslope);
@@ -207,7 +217,8 @@ static struct sk_buff *cbs_dequeue_soft(struct Qdisc *sch)
/* As sendslope is a negative number, this will decrease the
* amount of q->credits.
*/
- credits = credits_from_len(len, q->sendslope, q->port_rate);
+ credits = credits_from_len(len, q->sendslope,
+ atomic64_read(&q->port_rate));
credits += q->credits;
q->credits = max_t(s64, credits, q->locredit);
@@ -294,6 +305,50 @@ static int cbs_enable_offload(struct net_device *dev, struct cbs_sched_data *q,
return 0;
}
+static void cbs_set_port_rate(struct net_device *dev, struct cbs_sched_data *q)
+{
+ struct ethtool_link_ksettings ecmd;
+ int port_rate = -1;
+
+ if (!__ethtool_get_link_ksettings(dev, &ecmd) &&
+ ecmd.base.speed != SPEED_UNKNOWN)
+ port_rate = ecmd.base.speed * 1000 * BYTES_PER_KBIT;
+
+ atomic64_set(&q->port_rate, port_rate);
+ netdev_dbg(dev, "cbs: set %s's port_rate to: %lld, linkspeed: %d\n",
+ dev->name, (long long)atomic64_read(&q->port_rate),
+ ecmd.base.speed);
+}
+
+static int cbs_dev_notifier(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct cbs_sched_data *q;
+ struct net_device *qdev;
+ bool found = false;
+
+ ASSERT_RTNL();
+
+ if (event != NETDEV_UP && event != NETDEV_CHANGE)
+ return NOTIFY_DONE;
+
+ spin_lock(&cbs_list_lock);
+ list_for_each_entry(q, &cbs_list, cbs_list) {
+ qdev = qdisc_dev(q->qdisc);
+ if (qdev == dev) {
+ found = true;
+ break;
+ }
+ }
+ spin_unlock(&cbs_list_lock);
+
+ if (found)
+ cbs_set_port_rate(dev, q);
+
+ return NOTIFY_DONE;
+}
+
static int cbs_change(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
@@ -315,16 +370,7 @@ static int cbs_change(struct Qdisc *sch, struct nlattr *opt,
qopt = nla_data(tb[TCA_CBS_PARMS]);
if (!qopt->offload) {
- struct ethtool_link_ksettings ecmd;
- s64 link_speed;
-
- if (!__ethtool_get_link_ksettings(dev, &ecmd))
- link_speed = ecmd.base.speed;
- else
- link_speed = SPEED_1000;
-
- q->port_rate = link_speed * 1000 * BYTES_PER_KBIT;
-
+ cbs_set_port_rate(dev, q);
cbs_disable_offload(dev, q);
} else {
err = cbs_enable_offload(dev, q, qopt, extack);
@@ -347,6 +393,7 @@ static int cbs_init(struct Qdisc *sch, struct nlattr *opt,
{
struct cbs_sched_data *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
+ int err;
if (!opt) {
NL_SET_ERR_MSG(extack, "Missing CBS qdisc options which are mandatory");
@@ -367,7 +414,17 @@ static int cbs_init(struct Qdisc *sch, struct nlattr *opt,
qdisc_watchdog_init(&q->watchdog, sch);
- return cbs_change(sch, opt, extack);
+ err = cbs_change(sch, opt, extack);
+ if (err)
+ return err;
+
+ if (!q->offload) {
+ spin_lock(&cbs_list_lock);
+ list_add(&q->cbs_list, &cbs_list);
+ spin_unlock(&cbs_list_lock);
+ }
+
+ return 0;
}
static void cbs_destroy(struct Qdisc *sch)
@@ -375,8 +432,11 @@ static void cbs_destroy(struct Qdisc *sch)
struct cbs_sched_data *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
- qdisc_watchdog_cancel(&q->watchdog);
+ spin_lock(&cbs_list_lock);
+ list_del(&q->cbs_list);
+ spin_unlock(&cbs_list_lock);
+ qdisc_watchdog_cancel(&q->watchdog);
cbs_disable_offload(dev, q);
if (q->qdisc)
@@ -487,14 +547,24 @@ static struct Qdisc_ops cbs_qdisc_ops __read_mostly = {
.owner = THIS_MODULE,
};
+static struct notifier_block cbs_device_notifier = {
+ .notifier_call = cbs_dev_notifier,
+};
+
static int __init cbs_module_init(void)
{
+ int err = register_netdevice_notifier(&cbs_device_notifier);
+
+ if (err)
+ return err;
+
return register_qdisc(&cbs_qdisc_ops);
}
static void __exit cbs_module_exit(void)
{
unregister_qdisc(&cbs_qdisc_ops);
+ unregister_netdevice_notifier(&cbs_device_notifier);
}
module_init(cbs_module_init)
module_exit(cbs_module_exit)
--
2.21.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation
2019-04-08 17:12 [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation Leandro Dorileo
2019-04-08 17:12 ` [PATCH net-next V6 1/2] " Leandro Dorileo
2019-04-08 17:12 ` [PATCH net-next V6 2/2] net/sched: cbs: fix port_rate miscalculation Leandro Dorileo
@ 2019-04-11 2:28 ` David Miller
2 siblings, 0 replies; 5+ messages in thread
From: David Miller @ 2019-04-11 2:28 UTC (permalink / raw)
To: leandro.maciel.dorileo
Cc: netdev, jhs, xiyou.wangcong, jiri, vinicius.gomes, f.fainelli,
vedang.patel, andre.guedes
From: Leandro Dorileo <leandro.maciel.dorileo@intel.com>
Date: Mon, 8 Apr 2019 10:12:16 -0700
> This set fixes miscalculations based on invalid link speed values.
...
Series applied to net-next, thank you.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net-next V6 1/2] net/sched: taprio: fix picos_per_byte miscalculation
2019-04-08 17:12 ` [PATCH net-next V6 1/2] " Leandro Dorileo
@ 2019-04-11 3:00 ` kbuild test robot
0 siblings, 0 replies; 5+ messages in thread
From: kbuild test robot @ 2019-04-11 3:00 UTC (permalink / raw)
To: Leandro Dorileo
Cc: kbuild-all, netdev, Jamal Hadi Salim, Cong Wang, Jiri Pirko,
David S . Miller, Vinicius Costa Gomes, f.fainelli, vedang.patel,
andre.guedes
[-- Attachment #1: Type: text/plain, Size: 2693 bytes --]
Hi Leandro,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on net-next/master]
url: https://github.com/0day-ci/linux/commits/Leandro-Dorileo/net-sched-taprio-fix-picos_per_byte-miscalculation/20190410-083853
config: i386-randconfig-m3-201914 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All errors (new ones prefixed by >>):
net/sched/sch_taprio.o: In function `advance_sched':
>> net/sched/sch_taprio.c:245: undefined reference to `__divdi3'
net/sched/sch_taprio.o: In function `length_to_duration':
net/sched/sch_taprio.c:124: undefined reference to `__divdi3'
net/sched/sch_taprio.o: In function `taprio_start_sched':
net/sched/sch_taprio.c:579: undefined reference to `__divdi3'
vim +245 net/sched/sch_taprio.c
211
212 static enum hrtimer_restart advance_sched(struct hrtimer *timer)
213 {
214 struct taprio_sched *q = container_of(timer, struct taprio_sched,
215 advance_timer);
216 struct sched_entry *entry, *next;
217 struct Qdisc *sch = q->root;
218 ktime_t close_time;
219
220 spin_lock(&q->current_entry_lock);
221 entry = rcu_dereference_protected(q->current_entry,
222 lockdep_is_held(&q->current_entry_lock));
223
224 /* This is the case that it's the first time that the schedule
225 * runs, so it only happens once per schedule. The first entry
226 * is pre-calculated during the schedule initialization.
227 */
228 if (unlikely(!entry)) {
229 next = list_first_entry(&q->entries, struct sched_entry,
230 list);
231 close_time = next->close_time;
232 goto first_run;
233 }
234
235 if (should_restart_cycle(q, entry))
236 next = list_first_entry(&q->entries, struct sched_entry,
237 list);
238 else
239 next = list_next_entry(entry, list);
240
241 close_time = ktime_add_ns(entry->close_time, next->interval);
242
243 next->close_time = close_time;
244 atomic_set(&next->budget,
> 245 (next->interval * 1000) / atomic64_read(&q->picos_per_byte));
246
247 first_run:
248 rcu_assign_pointer(q->current_entry, next);
249 spin_unlock(&q->current_entry_lock);
250
251 hrtimer_set_expires(&q->advance_timer, close_time);
252
253 rcu_read_lock();
254 __netif_schedule(sch);
255 rcu_read_unlock();
256
257 return HRTIMER_RESTART;
258 }
259
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 28525 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-04-11 3:01 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-04-08 17:12 [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation Leandro Dorileo
2019-04-08 17:12 ` [PATCH net-next V6 1/2] " Leandro Dorileo
2019-04-11 3:00 ` kbuild test robot
2019-04-08 17:12 ` [PATCH net-next V6 2/2] net/sched: cbs: fix port_rate miscalculation Leandro Dorileo
2019-04-11 2:28 ` [PATCH net-next V6 0/2] net/sched: taprio: fix picos_per_byte miscalculation David Miller
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