1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_PKT_SCHED_H
3 #define __NET_PKT_SCHED_H
5 #include <linux/jiffies.h>
6 #include <linux/ktime.h>
7 #include <linux/if_vlan.h>
8 #include <linux/netdevice.h>
9 #include <net/sch_generic.h>
10 #include <net/net_namespace.h>
11 #include <uapi/linux/pkt_sched.h>
13 #define DEFAULT_TX_QUEUE_LEN 1000
19 int (*fn
)(struct Qdisc
*, unsigned long cl
, struct qdisc_walker
*);
22 static inline void *qdisc_priv(struct Qdisc
*q
)
27 static inline struct Qdisc
*qdisc_from_priv(void *priv
)
29 return container_of(priv
, struct Qdisc
, privdata
);
33 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
35 Normal IP packet size ~ 512byte, hence:
37 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
40 10msec resolution -> <50Kbit/sec.
42 The result: [34]86 is not good choice for QoS router :-(
44 The things are not so bad, because we may use artificial
45 clock evaluated by integration of network data flow
46 in the most critical places.
49 typedef u64 psched_time_t
;
50 typedef long psched_tdiff_t
;
52 /* Avoid doing 64 bit divide */
53 #define PSCHED_SHIFT 6
54 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
55 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
57 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
58 #define PSCHED_PASTPERFECT 0
60 static inline psched_time_t
psched_get_time(void)
62 return PSCHED_NS2TICKS(ktime_get_ns());
65 static inline psched_tdiff_t
66 psched_tdiff_bounded(psched_time_t tv1
, psched_time_t tv2
, psched_time_t bound
)
68 return min(tv1
- tv2
, bound
);
71 struct qdisc_watchdog
{
77 void qdisc_watchdog_init_clockid(struct qdisc_watchdog
*wd
, struct Qdisc
*qdisc
,
79 void qdisc_watchdog_init(struct qdisc_watchdog
*wd
, struct Qdisc
*qdisc
);
81 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog
*wd
, u64 expires
,
84 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog
*wd
,
87 return qdisc_watchdog_schedule_range_ns(wd
, expires
, 0ULL);
90 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog
*wd
,
91 psched_time_t expires
)
93 qdisc_watchdog_schedule_ns(wd
, PSCHED_TICKS2NS(expires
));
96 void qdisc_watchdog_cancel(struct qdisc_watchdog
*wd
);
98 extern struct Qdisc_ops pfifo_qdisc_ops
;
99 extern struct Qdisc_ops bfifo_qdisc_ops
;
100 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops
;
102 int fifo_set_limit(struct Qdisc
*q
, unsigned int limit
);
103 struct Qdisc
*fifo_create_dflt(struct Qdisc
*sch
, struct Qdisc_ops
*ops
,
105 struct netlink_ext_ack
*extack
);
107 int register_qdisc(struct Qdisc_ops
*qops
);
108 int unregister_qdisc(struct Qdisc_ops
*qops
);
109 void qdisc_get_default(char *id
, size_t len
);
110 int qdisc_set_default(const char *id
);
112 void qdisc_hash_add(struct Qdisc
*q
, bool invisible
);
113 void qdisc_hash_del(struct Qdisc
*q
);
114 struct Qdisc
*qdisc_lookup(struct net_device
*dev
, u32 handle
);
115 struct Qdisc
*qdisc_lookup_rcu(struct net_device
*dev
, u32 handle
);
116 struct qdisc_rate_table
*qdisc_get_rtab(struct tc_ratespec
*r
,
118 struct netlink_ext_ack
*extack
);
119 void qdisc_put_rtab(struct qdisc_rate_table
*tab
);
120 void qdisc_put_stab(struct qdisc_size_table
*tab
);
121 void qdisc_warn_nonwc(const char *txt
, struct Qdisc
*qdisc
);
122 bool sch_direct_xmit(struct sk_buff
*skb
, struct Qdisc
*q
,
123 struct net_device
*dev
, struct netdev_queue
*txq
,
124 spinlock_t
*root_lock
, bool validate
);
126 void __qdisc_run(struct Qdisc
*q
);
128 static inline void qdisc_run(struct Qdisc
*q
)
130 if (qdisc_run_begin(q
)) {
131 /* NOLOCK qdisc must check 'state' under the qdisc seqlock
132 * to avoid racing with dev_qdisc_reset()
134 if (!(q
->flags
& TCQ_F_NOLOCK
) ||
135 likely(!test_bit(__QDISC_STATE_DEACTIVATED
, &q
->state
)))
141 /* Calculate maximal size of packet seen by hard_start_xmit
142 routine of this device.
144 static inline unsigned int psched_mtu(const struct net_device
*dev
)
146 return dev
->mtu
+ dev
->hard_header_len
;
149 static inline struct net
*qdisc_net(struct Qdisc
*q
)
151 return dev_net(q
->dev_queue
->dev
);
154 struct tc_cbs_qopt_offload
{
163 struct tc_etf_qopt_offload
{
168 struct tc_taprio_sched_entry
{
169 u8 command
; /* TC_TAPRIO_CMD_* */
171 /* The gate_mask in the offloading side refers to traffic classes */
176 struct tc_taprio_qopt_offload
{
180 u64 cycle_time_extension
;
183 struct tc_taprio_sched_entry entries
[];
186 /* Reference counting */
187 struct tc_taprio_qopt_offload
*taprio_offload_get(struct tc_taprio_qopt_offload
189 void taprio_offload_free(struct tc_taprio_qopt_offload
*offload
);