![Vedang Patel](/assets/img/avatar_default.png)
During the review of the iproute2 patches for txtime-assist mode, it was
pointed out that it does not make sense for the txtime-delay parameter to
be negative. So, change the type of the parameter from s32 to u32.
Fixes: 4cfd5779bd
("taprio: Add support for txtime-assist mode")
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Vedang Patel <vedang.patel@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1583 lines
40 KiB
C
1583 lines
40 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 <linux/rcupdate.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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#include <net/sock.h>
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#include <net/tcp.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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#define FLAGS_VALID(flags) (!((flags) & ~TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST))
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#define TXTIME_ASSIST_IS_ENABLED(flags) ((flags) & TCA_TAPRIO_ATTR_FLAG_TXTIME_ASSIST)
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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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ktime_t next_txtime;
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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 sched_gate_list {
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struct rcu_head rcu;
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struct list_head entries;
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size_t num_entries;
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ktime_t cycle_close_time;
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s64 cycle_time;
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s64 cycle_time_extension;
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s64 base_time;
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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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u32 flags;
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enum tk_offsets tk_offset;
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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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/* 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 sched_gate_list __rcu *oper_sched;
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struct sched_gate_list __rcu *admin_sched;
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struct hrtimer advance_timer;
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struct list_head taprio_list;
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u32 txtime_delay;
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};
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static ktime_t sched_base_time(const struct sched_gate_list *sched)
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{
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if (!sched)
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return KTIME_MAX;
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return ns_to_ktime(sched->base_time);
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}
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static ktime_t taprio_get_time(struct taprio_sched *q)
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{
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ktime_t mono = ktime_get();
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switch (q->tk_offset) {
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case TK_OFFS_MAX:
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return mono;
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default:
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return ktime_mono_to_any(mono, q->tk_offset);
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}
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return KTIME_MAX;
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}
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static void taprio_free_sched_cb(struct rcu_head *head)
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{
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struct sched_gate_list *sched = container_of(head, struct sched_gate_list, rcu);
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struct sched_entry *entry, *n;
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if (!sched)
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return;
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list_for_each_entry_safe(entry, n, &sched->entries, list) {
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list_del(&entry->list);
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kfree(entry);
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}
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kfree(sched);
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}
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static void switch_schedules(struct taprio_sched *q,
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struct sched_gate_list **admin,
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struct sched_gate_list **oper)
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{
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rcu_assign_pointer(q->oper_sched, *admin);
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rcu_assign_pointer(q->admin_sched, NULL);
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if (*oper)
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call_rcu(&(*oper)->rcu, taprio_free_sched_cb);
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*oper = *admin;
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*admin = NULL;
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}
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/* Get how much time has been already elapsed in the current cycle. */
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static s32 get_cycle_time_elapsed(struct sched_gate_list *sched, ktime_t time)
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{
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ktime_t time_since_sched_start;
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s32 time_elapsed;
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time_since_sched_start = ktime_sub(time, sched->base_time);
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div_s64_rem(time_since_sched_start, sched->cycle_time, &time_elapsed);
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return time_elapsed;
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}
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static ktime_t get_interval_end_time(struct sched_gate_list *sched,
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struct sched_gate_list *admin,
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struct sched_entry *entry,
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ktime_t intv_start)
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{
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s32 cycle_elapsed = get_cycle_time_elapsed(sched, intv_start);
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ktime_t intv_end, cycle_ext_end, cycle_end;
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cycle_end = ktime_add_ns(intv_start, sched->cycle_time - cycle_elapsed);
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intv_end = ktime_add_ns(intv_start, entry->interval);
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cycle_ext_end = ktime_add(cycle_end, sched->cycle_time_extension);
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if (ktime_before(intv_end, cycle_end))
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return intv_end;
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else if (admin && admin != sched &&
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ktime_after(admin->base_time, cycle_end) &&
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ktime_before(admin->base_time, cycle_ext_end))
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return admin->base_time;
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else
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return cycle_end;
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}
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static 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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/* Returns the entry corresponding to next available interval. If
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* validate_interval is set, it only validates whether the timestamp occurs
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* when the gate corresponding to the skb's traffic class is open.
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*/
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static struct sched_entry *find_entry_to_transmit(struct sk_buff *skb,
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struct Qdisc *sch,
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struct sched_gate_list *sched,
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struct sched_gate_list *admin,
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ktime_t time,
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ktime_t *interval_start,
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ktime_t *interval_end,
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bool validate_interval)
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{
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ktime_t curr_intv_start, curr_intv_end, cycle_end, packet_transmit_time;
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ktime_t earliest_txtime = KTIME_MAX, txtime, cycle, transmit_end_time;
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struct sched_entry *entry = NULL, *entry_found = NULL;
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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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bool entry_available = false;
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s32 cycle_elapsed;
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int tc, n;
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tc = netdev_get_prio_tc_map(dev, skb->priority);
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packet_transmit_time = length_to_duration(q, qdisc_pkt_len(skb));
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*interval_start = 0;
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*interval_end = 0;
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if (!sched)
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return NULL;
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cycle = sched->cycle_time;
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cycle_elapsed = get_cycle_time_elapsed(sched, time);
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curr_intv_end = ktime_sub_ns(time, cycle_elapsed);
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cycle_end = ktime_add_ns(curr_intv_end, cycle);
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list_for_each_entry(entry, &sched->entries, list) {
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curr_intv_start = curr_intv_end;
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curr_intv_end = get_interval_end_time(sched, admin, entry,
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curr_intv_start);
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if (ktime_after(curr_intv_start, cycle_end))
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break;
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if (!(entry->gate_mask & BIT(tc)) ||
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packet_transmit_time > entry->interval)
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continue;
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txtime = entry->next_txtime;
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if (ktime_before(txtime, time) || validate_interval) {
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transmit_end_time = ktime_add_ns(time, packet_transmit_time);
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if ((ktime_before(curr_intv_start, time) &&
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ktime_before(transmit_end_time, curr_intv_end)) ||
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(ktime_after(curr_intv_start, time) && !validate_interval)) {
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entry_found = entry;
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*interval_start = curr_intv_start;
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*interval_end = curr_intv_end;
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break;
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} else if (!entry_available && !validate_interval) {
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/* Here, we are just trying to find out the
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* first available interval in the next cycle.
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*/
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entry_available = 1;
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entry_found = entry;
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*interval_start = ktime_add_ns(curr_intv_start, cycle);
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*interval_end = ktime_add_ns(curr_intv_end, cycle);
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}
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} else if (ktime_before(txtime, earliest_txtime) &&
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!entry_available) {
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earliest_txtime = txtime;
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entry_found = entry;
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n = div_s64(ktime_sub(txtime, curr_intv_start), cycle);
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*interval_start = ktime_add(curr_intv_start, n * cycle);
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*interval_end = ktime_add(curr_intv_end, n * cycle);
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}
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}
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return entry_found;
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}
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static bool is_valid_interval(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct taprio_sched *q = qdisc_priv(sch);
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struct sched_gate_list *sched, *admin;
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ktime_t interval_start, interval_end;
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struct sched_entry *entry;
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rcu_read_lock();
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sched = rcu_dereference(q->oper_sched);
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admin = rcu_dereference(q->admin_sched);
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entry = find_entry_to_transmit(skb, sch, sched, admin, skb->tstamp,
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&interval_start, &interval_end, true);
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rcu_read_unlock();
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return entry;
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}
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/* This returns the tstamp value set by TCP in terms of the set clock. */
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static ktime_t get_tcp_tstamp(struct taprio_sched *q, struct sk_buff *skb)
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{
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unsigned int offset = skb_network_offset(skb);
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const struct ipv6hdr *ipv6h;
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const struct iphdr *iph;
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struct ipv6hdr _ipv6h;
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ipv6h = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
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if (!ipv6h)
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return 0;
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if (ipv6h->version == 4) {
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iph = (struct iphdr *)ipv6h;
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offset += iph->ihl * 4;
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/* special-case 6in4 tunnelling, as that is a common way to get
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* v6 connectivity in the home
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*/
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if (iph->protocol == IPPROTO_IPV6) {
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ipv6h = skb_header_pointer(skb, offset,
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sizeof(_ipv6h), &_ipv6h);
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if (!ipv6h || ipv6h->nexthdr != IPPROTO_TCP)
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return 0;
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} else if (iph->protocol != IPPROTO_TCP) {
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return 0;
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}
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} else if (ipv6h->version == 6 && ipv6h->nexthdr != IPPROTO_TCP) {
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return 0;
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}
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return ktime_mono_to_any(skb->skb_mstamp_ns, q->tk_offset);
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}
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/* There are a few scenarios where we will have to modify the txtime from
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* what is read from next_txtime in sched_entry. They are:
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* 1. If txtime is in the past,
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* a. The gate for the traffic class is currently open and packet can be
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* transmitted before it closes, schedule the packet right away.
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* b. If the gate corresponding to the traffic class is going to open later
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* in the cycle, set the txtime of packet to the interval start.
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* 2. If txtime is in the future, there are packets corresponding to the
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* current traffic class waiting to be transmitted. So, the following
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* possibilities exist:
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* a. We can transmit the packet before the window containing the txtime
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* closes.
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* b. The window might close before the transmission can be completed
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* successfully. So, schedule the packet in the next open window.
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*/
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static long get_packet_txtime(struct sk_buff *skb, struct Qdisc *sch)
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{
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ktime_t transmit_end_time, interval_end, interval_start, tcp_tstamp;
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struct taprio_sched *q = qdisc_priv(sch);
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struct sched_gate_list *sched, *admin;
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ktime_t minimum_time, now, txtime;
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int len, packet_transmit_time;
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struct sched_entry *entry;
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bool sched_changed;
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now = taprio_get_time(q);
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minimum_time = ktime_add_ns(now, q->txtime_delay);
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tcp_tstamp = get_tcp_tstamp(q, skb);
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minimum_time = max_t(ktime_t, minimum_time, tcp_tstamp);
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rcu_read_lock();
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admin = rcu_dereference(q->admin_sched);
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sched = rcu_dereference(q->oper_sched);
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if (admin && ktime_after(minimum_time, admin->base_time))
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switch_schedules(q, &admin, &sched);
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/* Until the schedule starts, all the queues are open */
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if (!sched || ktime_before(minimum_time, sched->base_time)) {
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txtime = minimum_time;
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goto done;
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}
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len = qdisc_pkt_len(skb);
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packet_transmit_time = length_to_duration(q, len);
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do {
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sched_changed = 0;
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entry = find_entry_to_transmit(skb, sch, sched, admin,
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minimum_time,
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&interval_start, &interval_end,
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false);
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if (!entry) {
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txtime = 0;
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goto done;
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}
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txtime = entry->next_txtime;
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txtime = max_t(ktime_t, txtime, minimum_time);
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txtime = max_t(ktime_t, txtime, interval_start);
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if (admin && admin != sched &&
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ktime_after(txtime, admin->base_time)) {
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sched = admin;
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sched_changed = 1;
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continue;
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}
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transmit_end_time = ktime_add(txtime, packet_transmit_time);
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minimum_time = transmit_end_time;
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/* Update the txtime of current entry to the next time it's
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* interval starts.
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*/
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if (ktime_after(transmit_end_time, interval_end))
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entry->next_txtime = ktime_add(interval_start, sched->cycle_time);
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} while (sched_changed || ktime_after(transmit_end_time, interval_end));
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entry->next_txtime = transmit_end_time;
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done:
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rcu_read_unlock();
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return txtime;
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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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if (skb->sk && sock_flag(skb->sk, SOCK_TXTIME)) {
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if (!is_valid_interval(skb, sch))
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return qdisc_drop(skb, sch, to_free);
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} else if (TXTIME_ASSIST_IS_ENABLED(q->flags)) {
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skb->tstamp = get_packet_txtime(skb, sch);
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if (!skb->tstamp)
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return qdisc_drop(skb, sch, to_free);
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}
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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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if (TXTIME_ASSIST_IS_ENABLED(q->flags))
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return skb;
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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 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 sk_buff *skb = NULL;
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struct sched_entry *entry;
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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
|
|
* accordance to IEEE 802.1Qbv-2015 Section 8.6.9.4.5
|
|
* "AdminGateSates"
|
|
*/
|
|
gate_mask = entry ? entry->gate_mask : TAPRIO_ALL_GATES_OPEN;
|
|
|
|
if (!gate_mask)
|
|
goto done;
|
|
|
|
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;
|
|
|
|
if (TXTIME_ASSIST_IS_ENABLED(q->flags)) {
|
|
skb = child->ops->dequeue(child);
|
|
if (!skb)
|
|
continue;
|
|
goto skb_found;
|
|
}
|
|
|
|
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(taprio_get_time(q),
|
|
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))
|
|
continue;
|
|
|
|
/* ... and no budget. */
|
|
if (gate_mask != TAPRIO_ALL_GATES_OPEN &&
|
|
atomic_sub_return(len, &entry->budget) < 0)
|
|
continue;
|
|
|
|
skb = child->ops->dequeue(child);
|
|
if (unlikely(!skb))
|
|
goto done;
|
|
|
|
skb_found:
|
|
qdisc_bstats_update(sch, skb);
|
|
qdisc_qstats_backlog_dec(sch, skb);
|
|
sch->q.qlen--;
|
|
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
return skb;
|
|
}
|
|
|
|
static bool should_restart_cycle(const struct sched_gate_list *oper,
|
|
const struct sched_entry *entry)
|
|
{
|
|
if (list_is_last(&entry->list, &oper->entries))
|
|
return true;
|
|
|
|
if (ktime_compare(entry->close_time, oper->cycle_close_time) == 0)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool should_change_schedules(const struct sched_gate_list *admin,
|
|
const struct sched_gate_list *oper,
|
|
ktime_t close_time)
|
|
{
|
|
ktime_t next_base_time, extension_time;
|
|
|
|
if (!admin)
|
|
return false;
|
|
|
|
next_base_time = sched_base_time(admin);
|
|
|
|
/* This is the simple case, the close_time would fall after
|
|
* the next schedule base_time.
|
|
*/
|
|
if (ktime_compare(next_base_time, close_time) <= 0)
|
|
return true;
|
|
|
|
/* This is the cycle_time_extension case, if the close_time
|
|
* plus the amount that can be extended would fall after the
|
|
* next schedule base_time, we can extend the current schedule
|
|
* for that amount.
|
|
*/
|
|
extension_time = ktime_add_ns(close_time, oper->cycle_time_extension);
|
|
|
|
/* FIXME: the IEEE 802.1Q-2018 Specification isn't clear about
|
|
* how precisely the extension should be made. So after
|
|
* conformance testing, this logic may change.
|
|
*/
|
|
if (ktime_compare(next_base_time, extension_time) <= 0)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static enum hrtimer_restart advance_sched(struct hrtimer *timer)
|
|
{
|
|
struct taprio_sched *q = container_of(timer, struct taprio_sched,
|
|
advance_timer);
|
|
struct sched_gate_list *oper, *admin;
|
|
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));
|
|
oper = rcu_dereference_protected(q->oper_sched,
|
|
lockdep_is_held(&q->current_entry_lock));
|
|
admin = rcu_dereference_protected(q->admin_sched,
|
|
lockdep_is_held(&q->current_entry_lock));
|
|
|
|
if (!oper)
|
|
switch_schedules(q, &admin, &oper);
|
|
|
|
/* This can happen in two cases: 1. this is the very first run
|
|
* of this function (i.e. we weren't running any schedule
|
|
* previously); 2. The previous schedule just ended. The first
|
|
* entry of all schedules are pre-calculated during the
|
|
* schedule initialization.
|
|
*/
|
|
if (unlikely(!entry || entry->close_time == oper->base_time)) {
|
|
next = list_first_entry(&oper->entries, struct sched_entry,
|
|
list);
|
|
close_time = next->close_time;
|
|
goto first_run;
|
|
}
|
|
|
|
if (should_restart_cycle(oper, entry)) {
|
|
next = list_first_entry(&oper->entries, struct sched_entry,
|
|
list);
|
|
oper->cycle_close_time = ktime_add_ns(oper->cycle_close_time,
|
|
oper->cycle_time);
|
|
} else {
|
|
next = list_next_entry(entry, list);
|
|
}
|
|
|
|
close_time = ktime_add_ns(entry->close_time, next->interval);
|
|
close_time = min_t(ktime_t, close_time, oper->cycle_close_time);
|
|
|
|
if (should_change_schedules(admin, oper, close_time)) {
|
|
/* Set things so the next time this runs, the new
|
|
* schedule runs.
|
|
*/
|
|
close_time = sched_base_time(admin);
|
|
switch_schedules(q, &admin, &oper);
|
|
}
|
|
|
|
next->close_time = close_time;
|
|
taprio_set_budget(q, next);
|
|
|
|
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 },
|
|
[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME] = { .type = NLA_S64 },
|
|
[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION] = { .type = NLA_S64 },
|
|
};
|
|
|
|
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_deprecated(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);
|
|
}
|
|
|
|
static int parse_sched_list(struct nlattr *list,
|
|
struct sched_gate_list *sched,
|
|
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, &sched->entries);
|
|
i++;
|
|
}
|
|
|
|
sched->num_entries = i;
|
|
|
|
return i;
|
|
}
|
|
|
|
static int parse_taprio_schedule(struct nlattr **tb,
|
|
struct sched_gate_list *new,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int err = 0;
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_SCHED_SINGLE_ENTRY]) {
|
|
NL_SET_ERR_MSG(extack, "Adding a single entry is not supported");
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME])
|
|
new->base_time = nla_get_s64(tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME]);
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION])
|
|
new->cycle_time_extension = nla_get_s64(tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION]);
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME])
|
|
new->cycle_time = nla_get_s64(tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME]);
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST])
|
|
err = parse_sched_list(
|
|
tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST], new, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!new->cycle_time) {
|
|
struct sched_entry *entry;
|
|
ktime_t cycle = 0;
|
|
|
|
list_for_each_entry(entry, &new->entries, list)
|
|
cycle = ktime_add_ns(cycle, entry->interval);
|
|
new->cycle_time = cycle;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int taprio_parse_mqprio_opt(struct net_device *dev,
|
|
struct tc_mqprio_qopt *qopt,
|
|
struct netlink_ext_ack *extack,
|
|
u32 taprio_flags)
|
|
{
|
|
int i, j;
|
|
|
|
if (!qopt && !dev->num_tc) {
|
|
NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* If num_tc is already set, it means that the user already
|
|
* configured the mqprio part
|
|
*/
|
|
if (dev->num_tc)
|
|
return 0;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (TXTIME_ASSIST_IS_ENABLED(taprio_flags))
|
|
continue;
|
|
|
|
/* 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,
|
|
struct sched_gate_list *sched,
|
|
ktime_t *start)
|
|
{
|
|
struct taprio_sched *q = qdisc_priv(sch);
|
|
ktime_t now, base, cycle;
|
|
s64 n;
|
|
|
|
base = sched_base_time(sched);
|
|
now = taprio_get_time(q);
|
|
|
|
if (ktime_after(base, now)) {
|
|
*start = base;
|
|
return 0;
|
|
}
|
|
|
|
cycle = sched->cycle_time;
|
|
|
|
/* 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 setup_first_close_time(struct taprio_sched *q,
|
|
struct sched_gate_list *sched, ktime_t base)
|
|
{
|
|
struct sched_entry *first;
|
|
ktime_t cycle;
|
|
|
|
first = list_first_entry(&sched->entries,
|
|
struct sched_entry, list);
|
|
|
|
cycle = sched->cycle_time;
|
|
|
|
/* FIXME: find a better place to do this */
|
|
sched->cycle_close_time = ktime_add_ns(base, cycle);
|
|
|
|
first->close_time = ktime_add_ns(base, first->interval);
|
|
taprio_set_budget(q, first);
|
|
rcu_assign_pointer(q->current_entry, NULL);
|
|
}
|
|
|
|
static void taprio_start_sched(struct Qdisc *sch,
|
|
ktime_t start, struct sched_gate_list *new)
|
|
{
|
|
struct taprio_sched *q = qdisc_priv(sch);
|
|
ktime_t expires;
|
|
|
|
expires = hrtimer_get_expires(&q->advance_timer);
|
|
if (expires == 0)
|
|
expires = KTIME_MAX;
|
|
|
|
/* If the new schedule starts before the next expiration, we
|
|
* reprogram it to the earliest one, so we change the admin
|
|
* schedule to the operational one at the right time.
|
|
*/
|
|
start = min_t(ktime_t, start, expires);
|
|
|
|
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 void setup_txtime(struct taprio_sched *q,
|
|
struct sched_gate_list *sched, ktime_t base)
|
|
{
|
|
struct sched_entry *entry;
|
|
u32 interval = 0;
|
|
|
|
list_for_each_entry(entry, &sched->entries, list) {
|
|
entry->next_txtime = ktime_add_ns(base, interval);
|
|
interval += entry->interval;
|
|
}
|
|
}
|
|
|
|
static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[TCA_TAPRIO_ATTR_MAX + 1] = { };
|
|
struct sched_gate_list *oper, *admin, *new_admin;
|
|
struct taprio_sched *q = qdisc_priv(sch);
|
|
struct net_device *dev = qdisc_dev(sch);
|
|
struct tc_mqprio_qopt *mqprio = NULL;
|
|
u32 taprio_flags = 0;
|
|
int i, err, clockid;
|
|
unsigned long flags;
|
|
ktime_t start;
|
|
|
|
err = nla_parse_nested_deprecated(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]);
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_FLAGS]) {
|
|
taprio_flags = nla_get_u32(tb[TCA_TAPRIO_ATTR_FLAGS]);
|
|
|
|
if (q->flags != 0 && q->flags != taprio_flags) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Changing 'flags' of a running schedule is not supported");
|
|
return -EOPNOTSUPP;
|
|
} else if (!FLAGS_VALID(taprio_flags)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "Specified 'flags' are not valid");
|
|
return -EINVAL;
|
|
}
|
|
|
|
q->flags = taprio_flags;
|
|
}
|
|
|
|
err = taprio_parse_mqprio_opt(dev, mqprio, extack, taprio_flags);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
new_admin = kzalloc(sizeof(*new_admin), GFP_KERNEL);
|
|
if (!new_admin) {
|
|
NL_SET_ERR_MSG(extack, "Not enough memory for a new schedule");
|
|
return -ENOMEM;
|
|
}
|
|
INIT_LIST_HEAD(&new_admin->entries);
|
|
|
|
rcu_read_lock();
|
|
oper = rcu_dereference(q->oper_sched);
|
|
admin = rcu_dereference(q->admin_sched);
|
|
rcu_read_unlock();
|
|
|
|
if (mqprio && (oper || admin)) {
|
|
NL_SET_ERR_MSG(extack, "Changing the traffic mapping of a running schedule is not supported");
|
|
err = -ENOTSUPP;
|
|
goto free_sched;
|
|
}
|
|
|
|
err = parse_taprio_schedule(tb, new_admin, extack);
|
|
if (err < 0)
|
|
goto free_sched;
|
|
|
|
if (new_admin->num_entries == 0) {
|
|
NL_SET_ERR_MSG(extack, "There should be at least one entry in the schedule");
|
|
err = -EINVAL;
|
|
goto free_sched;
|
|
}
|
|
|
|
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)) {
|
|
NL_SET_ERR_MSG(extack, "Changing the 'clockid' of a running schedule is not supported");
|
|
err = -ENOTSUPP;
|
|
goto free_sched;
|
|
}
|
|
|
|
q->clockid = clockid;
|
|
}
|
|
|
|
if (q->clockid == -1 && !tb[TCA_TAPRIO_ATTR_SCHED_CLOCKID]) {
|
|
NL_SET_ERR_MSG(extack, "Specifying a 'clockid' is mandatory");
|
|
err = -EINVAL;
|
|
goto free_sched;
|
|
}
|
|
|
|
taprio_set_picos_per_byte(dev, q);
|
|
|
|
/* Protects against enqueue()/dequeue() */
|
|
spin_lock_bh(qdisc_lock(sch));
|
|
|
|
if (tb[TCA_TAPRIO_ATTR_TXTIME_DELAY]) {
|
|
if (!TXTIME_ASSIST_IS_ENABLED(q->flags)) {
|
|
NL_SET_ERR_MSG_MOD(extack, "txtime-delay can only be set when txtime-assist mode is enabled");
|
|
err = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
q->txtime_delay = nla_get_u32(tb[TCA_TAPRIO_ATTR_TXTIME_DELAY]);
|
|
}
|
|
|
|
if (!TXTIME_ASSIST_IS_ENABLED(taprio_flags) &&
|
|
!hrtimer_active(&q->advance_timer)) {
|
|
hrtimer_init(&q->advance_timer, q->clockid, HRTIMER_MODE_ABS);
|
|
q->advance_timer.function = advance_sched;
|
|
}
|
|
|
|
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]);
|
|
}
|
|
|
|
switch (q->clockid) {
|
|
case CLOCK_REALTIME:
|
|
q->tk_offset = TK_OFFS_REAL;
|
|
break;
|
|
case CLOCK_MONOTONIC:
|
|
q->tk_offset = TK_OFFS_MAX;
|
|
break;
|
|
case CLOCK_BOOTTIME:
|
|
q->tk_offset = TK_OFFS_BOOT;
|
|
break;
|
|
case CLOCK_TAI:
|
|
q->tk_offset = TK_OFFS_TAI;
|
|
break;
|
|
default:
|
|
NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
|
|
err = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
err = taprio_get_start_time(sch, new_admin, &start);
|
|
if (err < 0) {
|
|
NL_SET_ERR_MSG(extack, "Internal error: failed get start time");
|
|
goto unlock;
|
|
}
|
|
|
|
if (TXTIME_ASSIST_IS_ENABLED(taprio_flags)) {
|
|
setup_txtime(q, new_admin, start);
|
|
|
|
if (!oper) {
|
|
rcu_assign_pointer(q->oper_sched, new_admin);
|
|
err = 0;
|
|
new_admin = NULL;
|
|
goto unlock;
|
|
}
|
|
|
|
rcu_assign_pointer(q->admin_sched, new_admin);
|
|
if (admin)
|
|
call_rcu(&admin->rcu, taprio_free_sched_cb);
|
|
} else {
|
|
setup_first_close_time(q, new_admin, start);
|
|
|
|
/* Protects against advance_sched() */
|
|
spin_lock_irqsave(&q->current_entry_lock, flags);
|
|
|
|
taprio_start_sched(sch, start, new_admin);
|
|
|
|
rcu_assign_pointer(q->admin_sched, new_admin);
|
|
if (admin)
|
|
call_rcu(&admin->rcu, taprio_free_sched_cb);
|
|
|
|
spin_unlock_irqrestore(&q->current_entry_lock, flags);
|
|
}
|
|
|
|
new_admin = NULL;
|
|
err = 0;
|
|
|
|
unlock:
|
|
spin_unlock_bh(qdisc_lock(sch));
|
|
|
|
free_sched:
|
|
kfree(new_admin);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void taprio_destroy(struct Qdisc *sch)
|
|
{
|
|
struct taprio_sched *q = qdisc_priv(sch);
|
|
struct net_device *dev = qdisc_dev(sch);
|
|
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);
|
|
|
|
if (q->oper_sched)
|
|
call_rcu(&q->oper_sched->rcu, taprio_free_sched_cb);
|
|
|
|
if (q->admin_sched)
|
|
call_rcu(&q->admin_sched->rcu, taprio_free_sched_cb);
|
|
}
|
|
|
|
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);
|
|
int i;
|
|
|
|
spin_lock_init(&q->current_entry_lock);
|
|
|
|
hrtimer_init(&q->advance_timer, CLOCK_TAI, HRTIMER_MODE_ABS);
|
|
q->advance_timer.function = advance_sched;
|
|
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|
|
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_noflag(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 dump_schedule(struct sk_buff *msg,
|
|
const struct sched_gate_list *root)
|
|
{
|
|
struct nlattr *entry_list;
|
|
struct sched_entry *entry;
|
|
|
|
if (nla_put_s64(msg, TCA_TAPRIO_ATTR_SCHED_BASE_TIME,
|
|
root->base_time, TCA_TAPRIO_PAD))
|
|
return -1;
|
|
|
|
if (nla_put_s64(msg, TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME,
|
|
root->cycle_time, TCA_TAPRIO_PAD))
|
|
return -1;
|
|
|
|
if (nla_put_s64(msg, TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION,
|
|
root->cycle_time_extension, TCA_TAPRIO_PAD))
|
|
return -1;
|
|
|
|
entry_list = nla_nest_start_noflag(msg,
|
|
TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST);
|
|
if (!entry_list)
|
|
goto error_nest;
|
|
|
|
list_for_each_entry(entry, &root->entries, list) {
|
|
if (dump_entry(msg, entry) < 0)
|
|
goto error_nest;
|
|
}
|
|
|
|
nla_nest_end(msg, entry_list);
|
|
return 0;
|
|
|
|
error_nest:
|
|
nla_nest_cancel(msg, entry_list);
|
|
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 sched_gate_list *oper, *admin;
|
|
struct tc_mqprio_qopt opt = { 0 };
|
|
struct nlattr *nest, *sched_nest;
|
|
unsigned int i;
|
|
|
|
rcu_read_lock();
|
|
oper = rcu_dereference(q->oper_sched);
|
|
admin = rcu_dereference(q->admin_sched);
|
|
|
|
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_noflag(skb, TCA_OPTIONS);
|
|
if (!nest)
|
|
goto start_error;
|
|
|
|
if (nla_put(skb, TCA_TAPRIO_ATTR_PRIOMAP, sizeof(opt), &opt))
|
|
goto options_error;
|
|
|
|
if (nla_put_s32(skb, TCA_TAPRIO_ATTR_SCHED_CLOCKID, q->clockid))
|
|
goto options_error;
|
|
|
|
if (q->flags && nla_put_u32(skb, TCA_TAPRIO_ATTR_FLAGS, q->flags))
|
|
goto options_error;
|
|
|
|
if (q->txtime_delay &&
|
|
nla_put_u32(skb, TCA_TAPRIO_ATTR_TXTIME_DELAY, q->txtime_delay))
|
|
goto options_error;
|
|
|
|
if (oper && dump_schedule(skb, oper))
|
|
goto options_error;
|
|
|
|
if (!admin)
|
|
goto done;
|
|
|
|
sched_nest = nla_nest_start_noflag(skb, TCA_TAPRIO_ATTR_ADMIN_SCHED);
|
|
if (!sched_nest)
|
|
goto options_error;
|
|
|
|
if (dump_schedule(skb, admin))
|
|
goto admin_error;
|
|
|
|
nla_nest_end(skb, sched_nest);
|
|
|
|
done:
|
|
rcu_read_unlock();
|
|
|
|
return nla_nest_end(skb, nest);
|
|
|
|
admin_error:
|
|
nla_nest_cancel(skb, sched_nest);
|
|
|
|
options_error:
|
|
nla_nest_cancel(skb, nest);
|
|
|
|
start_error:
|
|
rcu_read_unlock();
|
|
return -ENOSPC;
|
|
}
|
|
|
|
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,
|
|
.change = taprio_change,
|
|
.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");
|