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Diffstat (limited to '')
| -rw-r--r-- | include/net/pkt_sched.h | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h new file mode 100644 index 000000000..e186b2bd8 --- /dev/null +++ b/include/net/pkt_sched.h @@ -0,0 +1,193 @@ +/* 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; +} + +/* + 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()); +} + +static inline psched_tdiff_t +psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) +{ + return min(tv1 - tv2, bound); +} + +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); +int 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_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_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; + + size_t num_entries; + struct tc_taprio_sched_entry entries[]; +}; + +/* 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); + +/* 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); +} + +#endif |