193 lines
5.0 KiB
C
193 lines
5.0 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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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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#define QDISC_ALIGNTO 64
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#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
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static inline void *qdisc_priv(struct Qdisc *q)
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{
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return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
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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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static inline psched_tdiff_t
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psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
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{
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return min(tv1 - tv2, bound);
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}
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struct qdisc_watchdog {
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u64 last_expires;
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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_ns(struct qdisc_watchdog *wd, u64 expires);
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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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int 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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/* NOLOCK qdisc must check 'state' under the qdisc seqlock
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* to avoid racing with dev_qdisc_reset()
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*/
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if (!(q->flags & TCQ_F_NOLOCK) ||
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likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
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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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static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
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{
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/* We need to take extra care in case the skb came via
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* vlan accelerated path. In that case, use skb->vlan_proto
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* as the original vlan header was already stripped.
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*/
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if (skb_vlan_tag_present(skb))
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return skb->vlan_proto;
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return skb->protocol;
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}
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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_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_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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u8 enable;
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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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size_t num_entries;
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struct tc_taprio_sched_entry entries[0];
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};
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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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#endif
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