310 lines
7.6 KiB
C
310 lines
7.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_PKT_SCHED_H
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#define __NET_PKT_SCHED_H
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#include <linux/jiffies.h>
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#include <linux/ktime.h>
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#include <linux/if_vlan.h>
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#include <linux/netdevice.h>
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#include <net/sch_generic.h>
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#include <net/net_namespace.h>
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#include <uapi/linux/pkt_sched.h>
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#define DEFAULT_TX_QUEUE_LEN 1000
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#define STAB_SIZE_LOG_MAX 30
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struct qdisc_walker {
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int stop;
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int skip;
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int count;
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int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
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};
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static inline void *qdisc_priv(struct Qdisc *q)
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{
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return &q->privdata;
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}
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static inline struct Qdisc *qdisc_from_priv(void *priv)
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{
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return container_of(priv, struct Qdisc, privdata);
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}
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/*
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Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
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Normal IP packet size ~ 512byte, hence:
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0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
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10Mbit ethernet.
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10msec resolution -> <50Kbit/sec.
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The result: [34]86 is not good choice for QoS router :-(
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The things are not so bad, because we may use artificial
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clock evaluated by integration of network data flow
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in the most critical places.
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*/
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typedef u64 psched_time_t;
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typedef long psched_tdiff_t;
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/* Avoid doing 64 bit divide */
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#define PSCHED_SHIFT 6
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#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
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#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
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#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
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#define PSCHED_PASTPERFECT 0
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static inline psched_time_t psched_get_time(void)
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{
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return PSCHED_NS2TICKS(ktime_get_ns());
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}
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struct qdisc_watchdog {
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struct hrtimer timer;
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struct Qdisc *qdisc;
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};
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void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
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clockid_t clockid);
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void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
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void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
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u64 delta_ns);
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static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
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u64 expires)
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{
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return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
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}
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static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
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psched_time_t expires)
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{
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qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
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}
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void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
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extern struct Qdisc_ops pfifo_qdisc_ops;
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extern struct Qdisc_ops bfifo_qdisc_ops;
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extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
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int fifo_set_limit(struct Qdisc *q, unsigned int limit);
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struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
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unsigned int limit,
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struct netlink_ext_ack *extack);
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int register_qdisc(struct Qdisc_ops *qops);
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void unregister_qdisc(struct Qdisc_ops *qops);
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void qdisc_get_default(char *id, size_t len);
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int qdisc_set_default(const char *id);
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void qdisc_hash_add(struct Qdisc *q, bool invisible);
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void qdisc_hash_del(struct Qdisc *q);
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struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
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struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
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struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
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struct nlattr *tab,
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struct netlink_ext_ack *extack);
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void qdisc_put_rtab(struct qdisc_rate_table *tab);
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void qdisc_put_stab(struct qdisc_size_table *tab);
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void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
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bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
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struct net_device *dev, struct netdev_queue *txq,
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spinlock_t *root_lock, bool validate);
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void __qdisc_run(struct Qdisc *q);
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static inline void qdisc_run(struct Qdisc *q)
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{
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if (qdisc_run_begin(q)) {
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__qdisc_run(q);
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qdisc_run_end(q);
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}
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}
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extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
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/* Calculate maximal size of packet seen by hard_start_xmit
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routine of this device.
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*/
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static inline unsigned int psched_mtu(const struct net_device *dev)
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{
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return dev->mtu + dev->hard_header_len;
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}
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static inline struct net *qdisc_net(struct Qdisc *q)
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{
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return dev_net(q->dev_queue->dev);
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}
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struct tc_query_caps_base {
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enum tc_setup_type type;
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void *caps;
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};
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struct tc_cbs_qopt_offload {
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u8 enable;
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s32 queue;
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s32 hicredit;
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s32 locredit;
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s32 idleslope;
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s32 sendslope;
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};
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struct tc_etf_qopt_offload {
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u8 enable;
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s32 queue;
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};
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struct tc_mqprio_caps {
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bool validate_queue_counts:1;
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};
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struct tc_mqprio_qopt_offload {
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/* struct tc_mqprio_qopt must always be the first element */
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struct tc_mqprio_qopt qopt;
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struct netlink_ext_ack *extack;
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u16 mode;
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u16 shaper;
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u32 flags;
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u64 min_rate[TC_QOPT_MAX_QUEUE];
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u64 max_rate[TC_QOPT_MAX_QUEUE];
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unsigned long preemptible_tcs;
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};
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struct tc_taprio_caps {
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bool supports_queue_max_sdu:1;
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bool gate_mask_per_txq:1;
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/* Device expects lower TXQ numbers to have higher priority over higher
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* TXQs, regardless of their TC mapping. DO NOT USE FOR NEW DRIVERS,
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* INSTEAD ENFORCE A PROPER TC:TXQ MAPPING COMING FROM USER SPACE.
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*/
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bool broken_mqprio:1;
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};
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enum tc_taprio_qopt_cmd {
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TAPRIO_CMD_REPLACE,
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TAPRIO_CMD_DESTROY,
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TAPRIO_CMD_STATS,
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TAPRIO_CMD_QUEUE_STATS,
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};
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/**
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* struct tc_taprio_qopt_stats - IEEE 802.1Qbv statistics
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* @window_drops: Frames that were dropped because they were too large to be
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* transmitted in any of the allotted time windows (open gates) for their
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* traffic class.
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* @tx_overruns: Frames still being transmitted by the MAC after the
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* transmission gate associated with their traffic class has closed.
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* Equivalent to `12.29.1.1.2 TransmissionOverrun` from 802.1Q-2018.
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*/
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struct tc_taprio_qopt_stats {
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u64 window_drops;
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u64 tx_overruns;
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};
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struct tc_taprio_qopt_queue_stats {
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int queue;
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struct tc_taprio_qopt_stats stats;
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};
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struct tc_taprio_sched_entry {
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u8 command; /* TC_TAPRIO_CMD_* */
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/* The gate_mask in the offloading side refers to traffic classes */
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u32 gate_mask;
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u32 interval;
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};
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struct tc_taprio_qopt_offload {
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enum tc_taprio_qopt_cmd cmd;
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union {
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/* TAPRIO_CMD_STATS */
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struct tc_taprio_qopt_stats stats;
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/* TAPRIO_CMD_QUEUE_STATS */
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struct tc_taprio_qopt_queue_stats queue_stats;
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/* TAPRIO_CMD_REPLACE */
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struct {
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struct tc_mqprio_qopt_offload mqprio;
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struct netlink_ext_ack *extack;
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ktime_t base_time;
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u64 cycle_time;
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u64 cycle_time_extension;
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u32 max_sdu[TC_MAX_QUEUE];
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size_t num_entries;
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struct tc_taprio_sched_entry entries[];
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};
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};
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};
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#if IS_ENABLED(CONFIG_NET_SCH_TAPRIO)
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/* Reference counting */
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struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
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*offload);
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void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
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#else
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/* Reference counting */
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static inline struct tc_taprio_qopt_offload *
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taprio_offload_get(struct tc_taprio_qopt_offload *offload)
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{
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return NULL;
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}
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static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload)
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{
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}
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#endif
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/* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
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* not mistaken for a software timestamp, because this will otherwise prevent
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* the dispatch of hardware timestamps to the socket.
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*/
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static inline void skb_txtime_consumed(struct sk_buff *skb)
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{
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skb->tstamp = ktime_set(0, 0);
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}
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struct tc_skb_cb {
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struct qdisc_skb_cb qdisc_cb;
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u16 mru;
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u8 post_ct:1;
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u8 post_ct_snat:1;
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u8 post_ct_dnat:1;
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u16 zone; /* Only valid if post_ct = true */
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};
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static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
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{
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struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
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BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
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return cb;
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}
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static inline bool tc_qdisc_stats_dump(struct Qdisc *sch,
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unsigned long cl,
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struct qdisc_walker *arg)
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{
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if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) {
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arg->stop = 1;
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return false;
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}
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arg->count++;
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return true;
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}
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#endif
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