1033 lines
24 KiB
C
1033 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* net/sched/sch_taprio.c Time Aware Priority Scheduler
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*
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* Authors: Vinicius Costa Gomes <vinicius.gomes@intel.com>
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*
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/math64.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#include <net/sch_generic.h>
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static LIST_HEAD(taprio_list);
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static DEFINE_SPINLOCK(taprio_list_lock);
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#define TAPRIO_ALL_GATES_OPEN -1
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struct sched_entry {
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struct list_head list;
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/* The instant that this entry "closes" and the next one
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* should open, the qdisc will make some effort so that no
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* packet leaves after this time.
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*/
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ktime_t close_time;
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atomic_t budget;
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int index;
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u32 gate_mask;
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u32 interval;
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u8 command;
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};
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struct taprio_sched {
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struct Qdisc **qdiscs;
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struct Qdisc *root;
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s64 base_time;
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int clockid;
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atomic64_t picos_per_byte; /* Using picoseconds because for 10Gbps+
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* speeds it's sub-nanoseconds per byte
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*/
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size_t num_entries;
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/* Protects the update side of the RCU protected current_entry */
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spinlock_t current_entry_lock;
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struct sched_entry __rcu *current_entry;
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struct list_head entries;
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ktime_t (*get_time)(void);
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struct hrtimer advance_timer;
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struct list_head taprio_list;
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};
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static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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struct sk_buff **to_free)
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{
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struct taprio_sched *q = qdisc_priv(sch);
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struct Qdisc *child;
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int queue;
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queue = skb_get_queue_mapping(skb);
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child = q->qdiscs[queue];
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if (unlikely(!child))
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return qdisc_drop(skb, sch, to_free);
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qdisc_qstats_backlog_inc(sch, skb);
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sch->q.qlen++;
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return qdisc_enqueue(skb, child, to_free);
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}
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static struct sk_buff *taprio_peek(struct Qdisc *sch)
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{
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struct taprio_sched *q = qdisc_priv(sch);
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struct net_device *dev = qdisc_dev(sch);
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struct sched_entry *entry;
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struct sk_buff *skb;
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u32 gate_mask;
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int i;
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rcu_read_lock();
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entry = rcu_dereference(q->current_entry);
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gate_mask = entry ? entry->gate_mask : TAPRIO_ALL_GATES_OPEN;
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rcu_read_unlock();
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if (!gate_mask)
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return NULL;
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for (i = 0; i < dev->num_tx_queues; i++) {
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struct Qdisc *child = q->qdiscs[i];
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int prio;
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u8 tc;
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if (unlikely(!child))
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continue;
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skb = child->ops->peek(child);
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if (!skb)
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continue;
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prio = skb->priority;
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tc = netdev_get_prio_tc_map(dev, prio);
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if (!(gate_mask & BIT(tc)))
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continue;
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return skb;
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}
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return NULL;
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}
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static inline int length_to_duration(struct taprio_sched *q, int len)
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{
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return div_u64(len * atomic64_read(&q->picos_per_byte), 1000);
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}
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static void taprio_set_budget(struct taprio_sched *q, struct sched_entry *entry)
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{
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atomic_set(&entry->budget,
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div64_u64((u64)entry->interval * 1000,
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atomic64_read(&q->picos_per_byte)));
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}
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static struct sk_buff *taprio_dequeue(struct Qdisc *sch)
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{
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struct taprio_sched *q = qdisc_priv(sch);
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struct net_device *dev = qdisc_dev(sch);
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struct sched_entry *entry;
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struct sk_buff *skb;
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u32 gate_mask;
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int i;
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if (atomic64_read(&q->picos_per_byte) == -1) {
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WARN_ONCE(1, "taprio: dequeue() called with unknown picos per byte.");
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return NULL;
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}
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rcu_read_lock();
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entry = rcu_dereference(q->current_entry);
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/* if there's no entry, it means that the schedule didn't
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* start yet, so force all gates to be open, this is in
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* accordance to IEEE 802.1Qbv-2015 Section 8.6.9.4.5
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* "AdminGateSates"
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*/
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gate_mask = entry ? entry->gate_mask : TAPRIO_ALL_GATES_OPEN;
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rcu_read_unlock();
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if (!gate_mask)
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return NULL;
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for (i = 0; i < dev->num_tx_queues; i++) {
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struct Qdisc *child = q->qdiscs[i];
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ktime_t guard;
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int prio;
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int len;
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u8 tc;
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if (unlikely(!child))
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continue;
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skb = child->ops->peek(child);
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if (!skb)
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continue;
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prio = skb->priority;
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tc = netdev_get_prio_tc_map(dev, prio);
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if (!(gate_mask & BIT(tc)))
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continue;
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len = qdisc_pkt_len(skb);
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guard = ktime_add_ns(q->get_time(),
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length_to_duration(q, len));
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/* In the case that there's no gate entry, there's no
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* guard band ...
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*/
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if (gate_mask != TAPRIO_ALL_GATES_OPEN &&
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ktime_after(guard, entry->close_time))
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continue;
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/* ... and no budget. */
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if (gate_mask != TAPRIO_ALL_GATES_OPEN &&
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atomic_sub_return(len, &entry->budget) < 0)
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continue;
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skb = child->ops->dequeue(child);
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if (unlikely(!skb))
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return NULL;
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qdisc_bstats_update(sch, skb);
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qdisc_qstats_backlog_dec(sch, skb);
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sch->q.qlen--;
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return skb;
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}
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return NULL;
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}
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static enum hrtimer_restart advance_sched(struct hrtimer *timer)
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{
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struct taprio_sched *q = container_of(timer, struct taprio_sched,
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advance_timer);
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struct sched_entry *entry, *next;
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struct Qdisc *sch = q->root;
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ktime_t close_time;
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spin_lock(&q->current_entry_lock);
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entry = rcu_dereference_protected(q->current_entry,
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lockdep_is_held(&q->current_entry_lock));
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/* This is the case that it's the first time that the schedule
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* runs, so it only happens once per schedule. The first entry
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* is pre-calculated during the schedule initialization.
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*/
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if (unlikely(!entry)) {
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next = list_first_entry(&q->entries, struct sched_entry,
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list);
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close_time = next->close_time;
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goto first_run;
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}
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if (list_is_last(&entry->list, &q->entries))
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next = list_first_entry(&q->entries, struct sched_entry,
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list);
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else
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next = list_next_entry(entry, list);
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close_time = ktime_add_ns(entry->close_time, next->interval);
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next->close_time = close_time;
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taprio_set_budget(q, next);
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first_run:
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rcu_assign_pointer(q->current_entry, next);
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spin_unlock(&q->current_entry_lock);
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hrtimer_set_expires(&q->advance_timer, close_time);
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rcu_read_lock();
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__netif_schedule(sch);
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rcu_read_unlock();
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return HRTIMER_RESTART;
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}
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static const struct nla_policy entry_policy[TCA_TAPRIO_SCHED_ENTRY_MAX + 1] = {
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[TCA_TAPRIO_SCHED_ENTRY_INDEX] = { .type = NLA_U32 },
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[TCA_TAPRIO_SCHED_ENTRY_CMD] = { .type = NLA_U8 },
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[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK] = { .type = NLA_U32 },
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[TCA_TAPRIO_SCHED_ENTRY_INTERVAL] = { .type = NLA_U32 },
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};
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static const struct nla_policy entry_list_policy[TCA_TAPRIO_SCHED_MAX + 1] = {
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[TCA_TAPRIO_SCHED_ENTRY] = { .type = NLA_NESTED },
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};
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static const struct nla_policy taprio_policy[TCA_TAPRIO_ATTR_MAX + 1] = {
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[TCA_TAPRIO_ATTR_PRIOMAP] = {
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.len = sizeof(struct tc_mqprio_qopt)
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},
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[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST] = { .type = NLA_NESTED },
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[TCA_TAPRIO_ATTR_SCHED_BASE_TIME] = { .type = NLA_S64 },
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[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY] = { .type = NLA_NESTED },
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[TCA_TAPRIO_ATTR_SCHED_CLOCKID] = { .type = NLA_S32 },
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};
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static int fill_sched_entry(struct nlattr **tb, struct sched_entry *entry,
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struct netlink_ext_ack *extack)
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{
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u32 interval = 0;
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if (tb[TCA_TAPRIO_SCHED_ENTRY_CMD])
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entry->command = nla_get_u8(
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tb[TCA_TAPRIO_SCHED_ENTRY_CMD]);
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if (tb[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK])
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entry->gate_mask = nla_get_u32(
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tb[TCA_TAPRIO_SCHED_ENTRY_GATE_MASK]);
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if (tb[TCA_TAPRIO_SCHED_ENTRY_INTERVAL])
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interval = nla_get_u32(
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tb[TCA_TAPRIO_SCHED_ENTRY_INTERVAL]);
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if (interval == 0) {
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NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
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return -EINVAL;
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}
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entry->interval = interval;
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return 0;
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}
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static int parse_sched_entry(struct nlattr *n, struct sched_entry *entry,
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int index, struct netlink_ext_ack *extack)
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{
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struct nlattr *tb[TCA_TAPRIO_SCHED_ENTRY_MAX + 1] = { };
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int err;
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err = nla_parse_nested(tb, TCA_TAPRIO_SCHED_ENTRY_MAX, n,
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entry_policy, NULL);
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if (err < 0) {
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NL_SET_ERR_MSG(extack, "Could not parse nested entry");
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return -EINVAL;
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}
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entry->index = index;
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return fill_sched_entry(tb, entry, extack);
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}
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/* Returns the number of entries in case of success */
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static int parse_sched_single_entry(struct nlattr *n,
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struct taprio_sched *q,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *tb_entry[TCA_TAPRIO_SCHED_ENTRY_MAX + 1] = { };
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struct nlattr *tb_list[TCA_TAPRIO_SCHED_MAX + 1] = { };
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struct sched_entry *entry;
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bool found = false;
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u32 index;
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int err;
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err = nla_parse_nested(tb_list, TCA_TAPRIO_SCHED_MAX,
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n, entry_list_policy, NULL);
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if (err < 0) {
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NL_SET_ERR_MSG(extack, "Could not parse nested entry");
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return -EINVAL;
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}
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if (!tb_list[TCA_TAPRIO_SCHED_ENTRY]) {
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NL_SET_ERR_MSG(extack, "Single-entry must include an entry");
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return -EINVAL;
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}
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err = nla_parse_nested(tb_entry, TCA_TAPRIO_SCHED_ENTRY_MAX,
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tb_list[TCA_TAPRIO_SCHED_ENTRY],
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entry_policy, NULL);
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if (err < 0) {
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NL_SET_ERR_MSG(extack, "Could not parse nested entry");
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return -EINVAL;
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}
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if (!tb_entry[TCA_TAPRIO_SCHED_ENTRY_INDEX]) {
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NL_SET_ERR_MSG(extack, "Entry must specify an index\n");
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return -EINVAL;
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}
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index = nla_get_u32(tb_entry[TCA_TAPRIO_SCHED_ENTRY_INDEX]);
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if (index >= q->num_entries) {
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NL_SET_ERR_MSG(extack, "Index for single entry exceeds number of entries in schedule");
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return -EINVAL;
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}
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list_for_each_entry(entry, &q->entries, list) {
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if (entry->index == index) {
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found = true;
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break;
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}
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}
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if (!found) {
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NL_SET_ERR_MSG(extack, "Could not find entry");
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return -ENOENT;
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}
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err = fill_sched_entry(tb_entry, entry, extack);
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if (err < 0)
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return err;
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return q->num_entries;
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}
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static int parse_sched_list(struct nlattr *list,
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struct taprio_sched *q,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *n;
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int err, rem;
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int i = 0;
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if (!list)
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return -EINVAL;
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nla_for_each_nested(n, list, rem) {
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struct sched_entry *entry;
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if (nla_type(n) != TCA_TAPRIO_SCHED_ENTRY) {
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NL_SET_ERR_MSG(extack, "Attribute is not of type 'entry'");
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continue;
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}
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry) {
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NL_SET_ERR_MSG(extack, "Not enough memory for entry");
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return -ENOMEM;
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}
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err = parse_sched_entry(n, entry, i, extack);
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if (err < 0) {
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kfree(entry);
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return err;
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}
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list_add_tail(&entry->list, &q->entries);
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i++;
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}
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q->num_entries = i;
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return i;
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}
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/* Returns the number of entries in case of success */
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static int parse_taprio_opt(struct nlattr **tb, struct taprio_sched *q,
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struct netlink_ext_ack *extack)
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{
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int err = 0;
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int clockid;
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if (tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST] &&
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tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY])
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return -EINVAL;
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if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY] && q->num_entries == 0)
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return -EINVAL;
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if (q->clockid == -1 && !tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID])
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return -EINVAL;
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if (tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME])
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q->base_time = nla_get_s64(
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tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME]);
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if (tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]) {
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clockid = nla_get_s32(tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]);
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/* We only support static clockids and we don't allow
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* for it to be modified after the first init.
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*/
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if (clockid < 0 || (q->clockid != -1 && q->clockid != clockid))
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return -EINVAL;
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q->clockid = clockid;
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}
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if (tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST])
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err = parse_sched_list(
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tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST], q, extack);
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else if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY])
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err = parse_sched_single_entry(
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tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY], q, extack);
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/* parse_sched_* return the number of entries in the schedule,
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* a schedule with zero entries is an error.
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*/
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if (err == 0) {
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NL_SET_ERR_MSG(extack, "The schedule should contain at least one entry");
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return -EINVAL;
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}
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return err;
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}
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static int taprio_parse_mqprio_opt(struct net_device *dev,
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struct tc_mqprio_qopt *qopt,
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struct netlink_ext_ack *extack)
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{
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int i, j;
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if (!qopt) {
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NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary");
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return -EINVAL;
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}
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/* Verify num_tc is not out of max range */
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if (qopt->num_tc > TC_MAX_QUEUE) {
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NL_SET_ERR_MSG(extack, "Number of traffic classes is outside valid range");
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return -EINVAL;
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}
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|
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/* taprio imposes that traffic classes map 1:n to tx queues */
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if (qopt->num_tc > dev->num_tx_queues) {
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NL_SET_ERR_MSG(extack, "Number of traffic classes is greater than number of HW queues");
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return -EINVAL;
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}
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|
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/* Verify priority mapping uses valid tcs */
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for (i = 0; i < TC_BITMASK + 1; i++) {
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if (qopt->prio_tc_map[i] >= qopt->num_tc) {
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NL_SET_ERR_MSG(extack, "Invalid traffic class in priority to traffic class mapping");
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return -EINVAL;
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}
|
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}
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for (i = 0; i < qopt->num_tc; i++) {
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unsigned int last = qopt->offset[i] + qopt->count[i];
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|
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/* 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 int taprio_get_start_time(struct Qdisc *sch, ktime_t *start)
|
|
{
|
|
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);
|
|
now = q->get_time();
|
|
|
|
if (ktime_after(base, now)) {
|
|
*start = base;
|
|
return 0;
|
|
}
|
|
|
|
/* Calculate the cycle_time, by summing all the intervals.
|
|
*/
|
|
cycle = 0;
|
|
list_for_each_entry(entry, &q->entries, list)
|
|
cycle = ktime_add_ns(cycle, entry->interval);
|
|
|
|
/* The qdisc is expected to have at least one sched_entry. Moreover,
|
|
* any entry must have 'interval' > 0. Thus if the cycle time is zero,
|
|
* something went really wrong. In that case, we should warn about this
|
|
* inconsistent state and return error.
|
|
*/
|
|
if (WARN_ON(!cycle))
|
|
return -EFAULT;
|
|
|
|
/* Schedule the start time for the beginning of the next
|
|
* cycle.
|
|
*/
|
|
n = div64_s64(ktime_sub_ns(now, base), cycle);
|
|
*start = ktime_add_ns(base, (n + 1) * cycle);
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
taprio_set_budget(q, first);
|
|
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 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)
|
|
{
|
|
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;
|
|
int i, err, size;
|
|
ktime_t start;
|
|
|
|
err = nla_parse_nested(tb, TCA_TAPRIO_ATTR_MAX, opt,
|
|
taprio_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
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]);
|
|
}
|
|
|
|
taprio_set_picos_per_byte(dev, q);
|
|
|
|
err = taprio_get_start_time(sch, &start);
|
|
if (err < 0) {
|
|
NL_SET_ERR_MSG(extack, "Internal error: failed get start time");
|
|
return err;
|
|
}
|
|
|
|
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;
|
|
|
|
spin_lock(&taprio_list_lock);
|
|
list_del(&q->taprio_list);
|
|
spin_unlock(&taprio_list_lock);
|
|
|
|
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;
|
|
|
|
spin_lock(&taprio_list_lock);
|
|
list_add(&q->taprio_list, &taprio_list);
|
|
spin_unlock(&taprio_list_lock);
|
|
|
|
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 ||
|
|
qdisc_qstats_copy(d, sch) < 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 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);
|
|
module_exit(taprio_module_exit);
|
|
MODULE_LICENSE("GPL");
|