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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef __NET_PKT_SCHED_H
- #define __NET_PKT_SCHED_H
- #include <linux/jiffies.h>
- #include <linux/ktime.h>
- #include <linux/if_vlan.h>
- #include <linux/netdevice.h>
- #include <net/sch_generic.h>
- #include <net/net_namespace.h>
- #include <uapi/linux/pkt_sched.h>
- #define DEFAULT_TX_QUEUE_LEN 1000
- #define STAB_SIZE_LOG_MAX 30
- struct qdisc_walker {
- int stop;
- int skip;
- int count;
- int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
- };
- static inline void *qdisc_priv(struct Qdisc *q)
- {
- return &q->privdata;
- }
- static inline struct Qdisc *qdisc_from_priv(void *priv)
- {
- return container_of(priv, struct Qdisc, privdata);
- }
- /*
- Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
-
- Normal IP packet size ~ 512byte, hence:
- 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
- 10Mbit ethernet.
- 10msec resolution -> <50Kbit/sec.
-
- The result: [34]86 is not good choice for QoS router :-(
- The things are not so bad, because we may use artificial
- clock evaluated by integration of network data flow
- in the most critical places.
- */
- typedef u64 psched_time_t;
- typedef long psched_tdiff_t;
- /* Avoid doing 64 bit divide */
- #define PSCHED_SHIFT 6
- #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
- #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
- #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
- #define PSCHED_PASTPERFECT 0
- static inline psched_time_t psched_get_time(void)
- {
- return PSCHED_NS2TICKS(ktime_get_ns());
- }
- struct qdisc_watchdog {
- u64 last_expires;
- struct hrtimer timer;
- struct Qdisc *qdisc;
- };
- void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
- clockid_t clockid);
- void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
- void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires,
- u64 delta_ns);
- static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd,
- u64 expires)
- {
- return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL);
- }
- static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
- psched_time_t expires)
- {
- qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
- }
- void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
- extern struct Qdisc_ops pfifo_qdisc_ops;
- extern struct Qdisc_ops bfifo_qdisc_ops;
- extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
- int fifo_set_limit(struct Qdisc *q, unsigned int limit);
- struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
- unsigned int limit,
- struct netlink_ext_ack *extack);
- int register_qdisc(struct Qdisc_ops *qops);
- void unregister_qdisc(struct Qdisc_ops *qops);
- void qdisc_get_default(char *id, size_t len);
- int qdisc_set_default(const char *id);
- void qdisc_hash_add(struct Qdisc *q, bool invisible);
- void qdisc_hash_del(struct Qdisc *q);
- struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
- struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
- struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
- struct nlattr *tab,
- struct netlink_ext_ack *extack);
- void qdisc_put_rtab(struct qdisc_rate_table *tab);
- void qdisc_put_stab(struct qdisc_size_table *tab);
- void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
- bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
- struct net_device *dev, struct netdev_queue *txq,
- spinlock_t *root_lock, bool validate);
- void __qdisc_run(struct Qdisc *q);
- static inline void qdisc_run(struct Qdisc *q)
- {
- if (qdisc_run_begin(q)) {
- __qdisc_run(q);
- qdisc_run_end(q);
- }
- }
- extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];
- /* Calculate maximal size of packet seen by hard_start_xmit
- routine of this device.
- */
- static inline unsigned int psched_mtu(const struct net_device *dev)
- {
- return READ_ONCE(dev->mtu) + dev->hard_header_len;
- }
- static inline struct net *qdisc_net(struct Qdisc *q)
- {
- return dev_net(q->dev_queue->dev);
- }
- struct tc_query_caps_base {
- enum tc_setup_type type;
- void *caps;
- };
- struct tc_cbs_qopt_offload {
- u8 enable;
- s32 queue;
- s32 hicredit;
- s32 locredit;
- s32 idleslope;
- s32 sendslope;
- };
- struct tc_etf_qopt_offload {
- u8 enable;
- s32 queue;
- };
- struct tc_taprio_caps {
- bool supports_queue_max_sdu:1;
- };
- struct tc_taprio_sched_entry {
- u8 command; /* TC_TAPRIO_CMD_* */
- /* The gate_mask in the offloading side refers to traffic classes */
- u32 gate_mask;
- u32 interval;
- };
- struct tc_taprio_qopt_offload {
- u8 enable;
- ktime_t base_time;
- u64 cycle_time;
- u64 cycle_time_extension;
- u32 max_sdu[TC_MAX_QUEUE];
- size_t num_entries;
- struct tc_taprio_sched_entry entries[];
- };
- #if IS_ENABLED(CONFIG_NET_SCH_TAPRIO)
- /* Reference counting */
- struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload
- *offload);
- void taprio_offload_free(struct tc_taprio_qopt_offload *offload);
- #else
- /* Reference counting */
- static inline struct tc_taprio_qopt_offload *
- taprio_offload_get(struct tc_taprio_qopt_offload *offload)
- {
- return NULL;
- }
- static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload)
- {
- }
- #endif
- /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is
- * not mistaken for a software timestamp, because this will otherwise prevent
- * the dispatch of hardware timestamps to the socket.
- */
- static inline void skb_txtime_consumed(struct sk_buff *skb)
- {
- skb->tstamp = ktime_set(0, 0);
- }
- struct tc_skb_cb {
- struct qdisc_skb_cb qdisc_cb;
- u16 mru;
- u8 post_ct:1;
- u8 post_ct_snat:1;
- u8 post_ct_dnat:1;
- u16 zone; /* Only valid if post_ct = true */
- };
- static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb)
- {
- struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb;
- BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
- return cb;
- }
- static inline bool tc_qdisc_stats_dump(struct Qdisc *sch,
- unsigned long cl,
- struct qdisc_walker *arg)
- {
- if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) {
- arg->stop = 1;
- return false;
- }
- arg->count++;
- return true;
- }
- #endif
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