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linux-sg2042/net/sched/sch_taprio.c

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// SPDX-License-Identifier: GPL-2.0
/* net/sched/sch_taprio.c Time Aware Priority Scheduler
*
* Authors: Vinicius Costa Gomes <vinicius.gomes@intel.com>
*
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <net/sch_generic.h>
#define TAPRIO_ALL_GATES_OPEN -1
struct sched_entry {
struct list_head list;
/* The instant that this entry "closes" and the next one
* should open, the qdisc will make some effort so that no
* packet leaves after this time.
*/
ktime_t close_time;
atomic_t budget;
int index;
u32 gate_mask;
u32 interval;
u8 command;
};
struct taprio_sched {
struct Qdisc **qdiscs;
struct Qdisc *root;
s64 base_time;
int clockid;
int 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 */
spinlock_t current_entry_lock;
struct sched_entry __rcu *current_entry;
struct list_head entries;
ktime_t (*get_time)(void);
struct hrtimer advance_timer;
};
static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff **to_free)
{
struct taprio_sched *q = qdisc_priv(sch);
struct Qdisc *child;
int queue;
queue = skb_get_queue_mapping(skb);
child = q->qdiscs[queue];
if (unlikely(!child))
return qdisc_drop(skb, sch, to_free);
qdisc_qstats_backlog_inc(sch, skb);
sch->q.qlen++;
return qdisc_enqueue(skb, child, to_free);
}
static struct sk_buff *taprio_peek(struct Qdisc *sch)
{
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct sched_entry *entry;
struct sk_buff *skb;
u32 gate_mask;
int i;
rcu_read_lock();
entry = rcu_dereference(q->current_entry);
gate_mask = entry ? entry->gate_mask : -1;
rcu_read_unlock();
if (!gate_mask)
return NULL;
for (i = 0; i < dev->num_tx_queues; i++) {
struct Qdisc *child = q->qdiscs[i];
int prio;
u8 tc;
if (unlikely(!child))
continue;
skb = child->ops->peek(child);
if (!skb)
continue;
prio = skb->priority;
tc = netdev_get_prio_tc_map(dev, prio);
if (!(gate_mask & BIT(tc)))
return NULL;
return skb;
}
return NULL;
}
static inline int length_to_duration(struct taprio_sched *q, int len)
{
return (len * q->picos_per_byte) / 1000;
}
static struct sk_buff *taprio_dequeue(struct Qdisc *sch)
{
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct sched_entry *entry;
struct sk_buff *skb;
u32 gate_mask;
int i;
rcu_read_lock();
entry = rcu_dereference(q->current_entry);
/* if there's no entry, it means that the schedule didn't
* start yet, so force all gates to be open, this is in
* accordance to IEEE 802.1Qbv-2015 Section 8.6.9.4.5
* "AdminGateSates"
*/
gate_mask = entry ? entry->gate_mask : TAPRIO_ALL_GATES_OPEN;
rcu_read_unlock();
if (!gate_mask)
return NULL;
for (i = 0; i < dev->num_tx_queues; i++) {
struct Qdisc *child = q->qdiscs[i];
ktime_t guard;
int prio;
int len;
u8 tc;
if (unlikely(!child))
continue;
skb = child->ops->peek(child);
if (!skb)
continue;
prio = skb->priority;
tc = netdev_get_prio_tc_map(dev, prio);
if (!(gate_mask & BIT(tc)))
continue;
len = qdisc_pkt_len(skb);
guard = ktime_add_ns(q->get_time(),
length_to_duration(q, len));
/* In the case that there's no gate entry, there's no
* guard band ...
*/
if (gate_mask != TAPRIO_ALL_GATES_OPEN &&
ktime_after(guard, entry->close_time))
return NULL;
/* ... and no budget. */
if (gate_mask != TAPRIO_ALL_GATES_OPEN &&
atomic_sub_return(len, &entry->budget) < 0)
return NULL;
skb = child->ops->dequeue(child);
if (unlikely(!skb))
return NULL;
qdisc_bstats_update(sch, skb);
qdisc_qstats_backlog_dec(sch, skb);
sch->q.qlen--;
return skb;
}
return NULL;
}
static bool should_restart_cycle(const struct taprio_sched *q,
const struct sched_entry *entry)
{
WARN_ON(!entry);
return list_is_last(&entry->list, &q->entries);
}
static enum hrtimer_restart advance_sched(struct hrtimer *timer)
{
struct taprio_sched *q = container_of(timer, struct taprio_sched,
advance_timer);
struct sched_entry *entry, *next;
struct Qdisc *sch = q->root;
ktime_t close_time;
spin_lock(&q->current_entry_lock);
entry = rcu_dereference_protected(q->current_entry,
lockdep_is_held(&q->current_entry_lock));
/* This is the case that it's the first time that the schedule
* runs, so it only happens once per schedule. The first entry
* is pre-calculated during the schedule initialization.
*/
if (unlikely(!entry)) {
next = list_first_entry(&q->entries, struct sched_entry,
list);
close_time = next->close_time;
goto first_run;
}
if (should_restart_cycle(q, entry))
next = list_first_entry(&q->entries, struct sched_entry,
list);
else
next = list_next_entry(entry, list);
close_time = ktime_add_ns(entry->close_time, next->interval);
next->close_time = close_time;
atomic_set(&next->budget,
(next->interval * 1000) / q->picos_per_byte);
first_run:
rcu_assign_pointer(q->current_entry, next);
spin_unlock(&q->current_entry_lock);
hrtimer_set_expires(&q->advance_timer, close_time);
rcu_read_lock();
__netif_schedule(sch);
rcu_read_unlock();
return HRTIMER_RESTART;
}
static const struct nla_policy entry_policy[TCA_TAPRIO_SCHED_ENTRY_MAX + 1] = {
[TCA_TAPRIO_SCHED_ENTRY_INDEX] = { .type = NLA_U32 },
[TCA_TAPRIO_SCHED_ENTRY_CMD] = { .type = NLA_U8 },
[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK] = { .type = NLA_U32 },
[TCA_TAPRIO_SCHED_ENTRY_INTERVAL] = { .type = NLA_U32 },
};
static const struct nla_policy entry_list_policy[TCA_TAPRIO_SCHED_MAX + 1] = {
[TCA_TAPRIO_SCHED_ENTRY] = { .type = NLA_NESTED },
};
static const struct nla_policy taprio_policy[TCA_TAPRIO_ATTR_MAX + 1] = {
[TCA_TAPRIO_ATTR_PRIOMAP] = {
.len = sizeof(struct tc_mqprio_qopt)
},
[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST] = { .type = NLA_NESTED },
[TCA_TAPRIO_ATTR_SCHED_BASE_TIME] = { .type = NLA_S64 },
[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY] = { .type = NLA_NESTED },
[TCA_TAPRIO_ATTR_SCHED_CLOCKID] = { .type = NLA_S32 },
};
static int fill_sched_entry(struct nlattr **tb, struct sched_entry *entry,
struct netlink_ext_ack *extack)
{
u32 interval = 0;
if (tb[TCA_TAPRIO_SCHED_ENTRY_CMD])
entry->command = nla_get_u8(
tb[TCA_TAPRIO_SCHED_ENTRY_CMD]);
if (tb[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK])
entry->gate_mask = nla_get_u32(
tb[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK]);
if (tb[TCA_TAPRIO_SCHED_ENTRY_INTERVAL])
interval = nla_get_u32(
tb[TCA_TAPRIO_SCHED_ENTRY_INTERVAL]);
if (interval == 0) {
NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
return -EINVAL;
}
entry->interval = interval;
return 0;
}
static int parse_sched_entry(struct nlattr *n, struct sched_entry *entry,
int index, struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_TAPRIO_SCHED_ENTRY_MAX + 1] = { };
int err;
err = nla_parse_nested(tb, TCA_TAPRIO_SCHED_ENTRY_MAX, n,
entry_policy, NULL);
if (err < 0) {
NL_SET_ERR_MSG(extack, "Could not parse nested entry");
return -EINVAL;
}
entry->index = index;
return fill_sched_entry(tb, entry, extack);
}
/* Returns the number of entries in case of success */
static int parse_sched_single_entry(struct nlattr *n,
struct taprio_sched *q,
struct netlink_ext_ack *extack)
{
struct nlattr *tb_entry[TCA_TAPRIO_SCHED_ENTRY_MAX + 1] = { };
struct nlattr *tb_list[TCA_TAPRIO_SCHED_MAX + 1] = { };
struct sched_entry *entry;
bool found = false;
u32 index;
int err;
err = nla_parse_nested(tb_list, TCA_TAPRIO_SCHED_MAX,
n, entry_list_policy, NULL);
if (err < 0) {
NL_SET_ERR_MSG(extack, "Could not parse nested entry");
return -EINVAL;
}
if (!tb_list[TCA_TAPRIO_SCHED_ENTRY]) {
NL_SET_ERR_MSG(extack, "Single-entry must include an entry");
return -EINVAL;
}
err = nla_parse_nested(tb_entry, TCA_TAPRIO_SCHED_ENTRY_MAX,
tb_list[TCA_TAPRIO_SCHED_ENTRY],
entry_policy, NULL);
if (err < 0) {
NL_SET_ERR_MSG(extack, "Could not parse nested entry");
return -EINVAL;
}
if (!tb_entry[TCA_TAPRIO_SCHED_ENTRY_INDEX]) {
NL_SET_ERR_MSG(extack, "Entry must specify an index\n");
return -EINVAL;
}
index = nla_get_u32(tb_entry[TCA_TAPRIO_SCHED_ENTRY_INDEX]);
if (index >= q->num_entries) {
NL_SET_ERR_MSG(extack, "Index for single entry exceeds number of entries in schedule");
return -EINVAL;
}
list_for_each_entry(entry, &q->entries, list) {
if (entry->index == index) {
found = true;
break;
}
}
if (!found) {
NL_SET_ERR_MSG(extack, "Could not find entry");
return -ENOENT;
}
err = fill_sched_entry(tb_entry, entry, extack);
if (err < 0)
return err;
return q->num_entries;
}
static int parse_sched_list(struct nlattr *list,
struct taprio_sched *q,
struct netlink_ext_ack *extack)
{
struct nlattr *n;
int err, rem;
int i = 0;
if (!list)
return -EINVAL;
nla_for_each_nested(n, list, rem) {
struct sched_entry *entry;
if (nla_type(n) != TCA_TAPRIO_SCHED_ENTRY) {
NL_SET_ERR_MSG(extack, "Attribute is not of type 'entry'");
continue;
}
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry) {
NL_SET_ERR_MSG(extack, "Not enough memory for entry");
return -ENOMEM;
}
err = parse_sched_entry(n, entry, i, extack);
if (err < 0) {
kfree(entry);
return err;
}
list_add_tail(&entry->list, &q->entries);
i++;
}
q->num_entries = i;
return i;
}
/* Returns the number of entries in case of success */
static int parse_taprio_opt(struct nlattr **tb, struct taprio_sched *q,
struct netlink_ext_ack *extack)
{
int err = 0;
int clockid;
if (tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST] &&
tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY])
return -EINVAL;
if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY] && q->num_entries == 0)
return -EINVAL;
if (q->clockid == -1 && !tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID])
return -EINVAL;
if (tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME])
q->base_time = nla_get_s64(
tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME]);
if (tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]) {
clockid = nla_get_s32(tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]);
/* We only support static clockids and we don't allow
* for it to be modified after the first init.
*/
if (clockid < 0 || (q->clockid != -1 && q->clockid != clockid))
return -EINVAL;
q->clockid = clockid;
}
if (tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST])
err = parse_sched_list(
tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST], q, extack);
else if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY])
err = parse_sched_single_entry(
tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY], q, extack);
/* parse_sched_* return the number of entries in the schedule,
* a schedule with zero entries is an error.
*/
if (err == 0) {
NL_SET_ERR_MSG(extack, "The schedule should contain at least one entry");
return -EINVAL;
}
return err;
}
static int taprio_parse_mqprio_opt(struct net_device *dev,
struct tc_mqprio_qopt *qopt,
struct netlink_ext_ack *extack)
{
int i, j;
if (!qopt) {
NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary");
return -EINVAL;
}
/* Verify num_tc is not out of max range */
if (qopt->num_tc > TC_MAX_QUEUE) {
NL_SET_ERR_MSG(extack, "Number of traffic classes is outside valid range");
return -EINVAL;
}
/* taprio imposes that traffic classes map 1:n to tx queues */
if (qopt->num_tc > dev->num_tx_queues) {
NL_SET_ERR_MSG(extack, "Number of traffic classes is greater than number of HW queues");
return -EINVAL;
}
/* Verify priority mapping uses valid tcs */
for (i = 0; i < TC_BITMASK + 1; i++) {
if (qopt->prio_tc_map[i] >= qopt->num_tc) {
NL_SET_ERR_MSG(extack, "Invalid traffic class in priority to traffic class mapping");
return -EINVAL;
}
}
for (i = 0; i < qopt->num_tc; i++) {
unsigned int last = qopt->offset[i] + qopt->count[i];
/* Verify the queue count is in tx range being equal to the
* real_num_tx_queues indicates the last queue is in use.
*/
if (qopt->offset[i] >= dev->num_tx_queues ||
!qopt->count[i] ||
last > dev->real_num_tx_queues) {
NL_SET_ERR_MSG(extack, "Invalid queue in traffic class to queue mapping");
return -EINVAL;
}
/* Verify that the offset and counts do not overlap */
for (j = i + 1; j < qopt->num_tc; j++) {
if (last > qopt->offset[j]) {
NL_SET_ERR_MSG(extack, "Detected overlap in the traffic class to queue mapping");
return -EINVAL;
}
}
}
return 0;
}
static ktime_t taprio_get_start_time(struct Qdisc *sch)
{
struct taprio_sched *q = qdisc_priv(sch);
struct sched_entry *entry;
ktime_t now, base, cycle;
s64 n;
base = ns_to_ktime(q->base_time);
cycle = 0;
/* Calculate the cycle_time, by summing all the intervals.
*/
list_for_each_entry(entry, &q->entries, list)
cycle = ktime_add_ns(cycle, entry->interval);
if (!cycle)
return base;
now = q->get_time();
if (ktime_after(base, now))
return base;
/* Schedule the start time for the beginning of the next
* cycle.
*/
n = div64_s64(ktime_sub_ns(now, base), cycle);
return ktime_add_ns(base, (n + 1) * cycle);
}
static void taprio_start_sched(struct Qdisc *sch, ktime_t start)
{
struct taprio_sched *q = qdisc_priv(sch);
struct sched_entry *first;
unsigned long flags;
spin_lock_irqsave(&q->current_entry_lock, flags);
first = list_first_entry(&q->entries, struct sched_entry,
list);
first->close_time = ktime_add_ns(start, first->interval);
atomic_set(&first->budget,
(first->interval * 1000) / q->picos_per_byte);
rcu_assign_pointer(q->current_entry, NULL);
spin_unlock_irqrestore(&q->current_entry_lock, flags);
hrtimer_start(&q->advance_timer, start, HRTIMER_MODE_ABS);
}
static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_TAPRIO_ATTR_MAX + 1] = { };
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,
taprio_policy, extack);
if (err < 0)
return err;
err = -EINVAL;
if (tb[TCA_TAPRIO_ATTR_PRIOMAP])
mqprio = nla_data(tb[TCA_TAPRIO_ATTR_PRIOMAP]);
err = taprio_parse_mqprio_opt(dev, mqprio, extack);
if (err < 0)
return err;
/* A schedule with less than one entry is an error */
size = parse_taprio_opt(tb, q, extack);
if (size < 0)
return size;
hrtimer_init(&q->advance_timer, q->clockid, HRTIMER_MODE_ABS);
q->advance_timer.function = advance_sched;
switch (q->clockid) {
case CLOCK_REALTIME:
q->get_time = ktime_get_real;
break;
case CLOCK_MONOTONIC:
q->get_time = ktime_get;
break;
case CLOCK_BOOTTIME:
q->get_time = ktime_get_boottime;
break;
case CLOCK_TAI:
q->get_time = ktime_get_clocktai;
break;
default:
return -ENOTSUPP;
}
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *dev_queue;
struct Qdisc *qdisc;
dev_queue = netdev_get_tx_queue(dev, i);
qdisc = qdisc_create_dflt(dev_queue,
&pfifo_qdisc_ops,
TC_H_MAKE(TC_H_MAJ(sch->handle),
TC_H_MIN(i + 1)),
extack);
if (!qdisc)
return -ENOMEM;
if (i < dev->real_num_tx_queues)
qdisc_hash_add(qdisc, false);
q->qdiscs[i] = qdisc;
}
if (mqprio) {
netdev_set_num_tc(dev, mqprio->num_tc);
for (i = 0; i < mqprio->num_tc; i++)
netdev_set_tc_queue(dev, i,
mqprio->count[i],
mqprio->offset[i]);
/* Always use supplied priority mappings */
for (i = 0; i < TC_BITMASK + 1; i++)
netdev_set_prio_tc_map(dev, i,
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);
start = taprio_get_start_time(sch);
if (!start)
return 0;
taprio_start_sched(sch, start);
return 0;
}
static void taprio_destroy(struct Qdisc *sch)
{
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct sched_entry *entry, *n;
unsigned int i;
hrtimer_cancel(&q->advance_timer);
if (q->qdiscs) {
for (i = 0; i < dev->num_tx_queues && q->qdiscs[i]; i++)
qdisc_put(q->qdiscs[i]);
kfree(q->qdiscs);
}
q->qdiscs = NULL;
netdev_set_num_tc(dev, 0);
list_for_each_entry_safe(entry, n, &q->entries, list) {
list_del(&entry->list);
kfree(entry);
}
}
static int taprio_init(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
INIT_LIST_HEAD(&q->entries);
spin_lock_init(&q->current_entry_lock);
/* We may overwrite the configuration later */
hrtimer_init(&q->advance_timer, CLOCK_TAI, HRTIMER_MODE_ABS);
q->root = sch;
/* We only support static clockids. Use an invalid value as default
* and get the valid one on taprio_change().
*/
q->clockid = -1;
if (sch->parent != TC_H_ROOT)
return -EOPNOTSUPP;
if (!netif_is_multiqueue(dev))
return -EOPNOTSUPP;
/* pre-allocate qdisc, attachment can't fail */
q->qdiscs = kcalloc(dev->num_tx_queues,
sizeof(q->qdiscs[0]),
GFP_KERNEL);
if (!q->qdiscs)
return -ENOMEM;
if (!opt)
return -EINVAL;
return taprio_change(sch, opt, extack);
}
static struct netdev_queue *taprio_queue_get(struct Qdisc *sch,
unsigned long cl)
{
struct net_device *dev = qdisc_dev(sch);
unsigned long ntx = cl - 1;
if (ntx >= dev->num_tx_queues)
return NULL;
return netdev_get_tx_queue(dev, ntx);
}
static int taprio_graft(struct Qdisc *sch, unsigned long cl,
struct Qdisc *new, struct Qdisc **old,
struct netlink_ext_ack *extack)
{
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct netdev_queue *dev_queue = taprio_queue_get(sch, cl);
if (!dev_queue)
return -EINVAL;
if (dev->flags & IFF_UP)
dev_deactivate(dev);
*old = q->qdiscs[cl - 1];
q->qdiscs[cl - 1] = new;
if (new)
new->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT;
if (dev->flags & IFF_UP)
dev_activate(dev);
return 0;
}
static int dump_entry(struct sk_buff *msg,
const struct sched_entry *entry)
{
struct nlattr *item;
item = nla_nest_start(msg, TCA_TAPRIO_SCHED_ENTRY);
if (!item)
return -ENOSPC;
if (nla_put_u32(msg, TCA_TAPRIO_SCHED_ENTRY_INDEX, entry->index))
goto nla_put_failure;
if (nla_put_u8(msg, TCA_TAPRIO_SCHED_ENTRY_CMD, entry->command))
goto nla_put_failure;
if (nla_put_u32(msg, TCA_TAPRIO_SCHED_ENTRY_GATE_MASK,
entry->gate_mask))
goto nla_put_failure;
if (nla_put_u32(msg, TCA_TAPRIO_SCHED_ENTRY_INTERVAL,
entry->interval))
goto nla_put_failure;
return nla_nest_end(msg, item);
nla_put_failure:
nla_nest_cancel(msg, item);
return -1;
}
static int taprio_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct taprio_sched *q = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct tc_mqprio_qopt opt = { 0 };
struct nlattr *nest, *entry_list;
struct sched_entry *entry;
unsigned int i;
opt.num_tc = netdev_get_num_tc(dev);
memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
for (i = 0; i < netdev_get_num_tc(dev); i++) {
opt.count[i] = dev->tc_to_txq[i].count;
opt.offset[i] = dev->tc_to_txq[i].offset;
}
nest = nla_nest_start(skb, TCA_OPTIONS);
if (!nest)
return -ENOSPC;
if (nla_put(skb, TCA_TAPRIO_ATTR_PRIOMAP, sizeof(opt), &opt))
goto options_error;
if (nla_put_s64(skb, TCA_TAPRIO_ATTR_SCHED_BASE_TIME,
q->base_time, TCA_TAPRIO_PAD))
goto options_error;
if (nla_put_s32(skb, TCA_TAPRIO_ATTR_SCHED_CLOCKID, q->clockid))
goto options_error;
entry_list = nla_nest_start(skb, TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST);
if (!entry_list)
goto options_error;
list_for_each_entry(entry, &q->entries, list) {
if (dump_entry(skb, entry) < 0)
goto options_error;
}
nla_nest_end(skb, entry_list);
return nla_nest_end(skb, nest);
options_error:
nla_nest_cancel(skb, nest);
return -1;
}
static struct Qdisc *taprio_leaf(struct Qdisc *sch, unsigned long cl)
{
struct netdev_queue *dev_queue = taprio_queue_get(sch, cl);
if (!dev_queue)
return NULL;
return dev_queue->qdisc_sleeping;
}
static unsigned long taprio_find(struct Qdisc *sch, u32 classid)
{
unsigned int ntx = TC_H_MIN(classid);
if (!taprio_queue_get(sch, ntx))
return 0;
return ntx;
}
static int taprio_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
struct netdev_queue *dev_queue = taprio_queue_get(sch, cl);
tcm->tcm_parent = TC_H_ROOT;
tcm->tcm_handle |= TC_H_MIN(cl);
tcm->tcm_info = dev_queue->qdisc_sleeping->handle;
return 0;
}
static int taprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
struct gnet_dump *d)
__releases(d->lock)
__acquires(d->lock)
{
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 ||
gnet_stats_copy_queue(d, NULL, &sch->qstats, sch->q.qlen) < 0)
return -1;
return 0;
}
static void taprio_walk(struct Qdisc *sch, struct qdisc_walker *arg)
{
struct net_device *dev = qdisc_dev(sch);
unsigned long ntx;
if (arg->stop)
return;
arg->count = arg->skip;
for (ntx = arg->skip; ntx < dev->num_tx_queues; ntx++) {
if (arg->fn(sch, ntx + 1, arg) < 0) {
arg->stop = 1;
break;
}
arg->count++;
}
}
static struct netdev_queue *taprio_select_queue(struct Qdisc *sch,
struct tcmsg *tcm)
{
return taprio_queue_get(sch, TC_H_MIN(tcm->tcm_parent));
}
static const struct Qdisc_class_ops taprio_class_ops = {
.graft = taprio_graft,
.leaf = taprio_leaf,
.find = taprio_find,
.walk = taprio_walk,
.dump = taprio_dump_class,
.dump_stats = taprio_dump_class_stats,
.select_queue = taprio_select_queue,
};
static struct Qdisc_ops taprio_qdisc_ops __read_mostly = {
.cl_ops = &taprio_class_ops,
.id = "taprio",
.priv_size = sizeof(struct taprio_sched),
.init = taprio_init,
.destroy = taprio_destroy,
.peek = taprio_peek,
.dequeue = taprio_dequeue,
.enqueue = taprio_enqueue,
.dump = taprio_dump,
.owner = THIS_MODULE,
};
static int __init taprio_module_init(void)
{
return register_qdisc(&taprio_qdisc_ops);
}
static void __exit taprio_module_exit(void)
{
unregister_qdisc(&taprio_qdisc_ops);
}
module_init(taprio_module_init);
module_exit(taprio_module_exit);
MODULE_LICENSE("GPL");
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