1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __NET_PKT_SCHED_H 3 #define __NET_PKT_SCHED_H 4 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> 12 13 #define DEFAULT_TX_QUEUE_LEN 1000 14 15 struct qdisc_walker { 16 int stop; 17 int skip; 18 int count; 19 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); 20 }; 21 22 static inline void *qdisc_priv(struct Qdisc *q) 23 { 24 return &q->privdata; 25 } 26 27 /* 28 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 29 30 Normal IP packet size ~ 512byte, hence: 31 32 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 33 10Mbit ethernet. 34 35 10msec resolution -> <50Kbit/sec. 36 37 The result: [34]86 is not good choice for QoS router :-( 38 39 The things are not so bad, because we may use artificial 40 clock evaluated by integration of network data flow 41 in the most critical places. 42 */ 43 44 typedef u64 psched_time_t; 45 typedef long psched_tdiff_t; 46 47 /* Avoid doing 64 bit divide */ 48 #define PSCHED_SHIFT 6 49 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) 50 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) 51 52 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 53 #define PSCHED_PASTPERFECT 0 54 55 static inline psched_time_t psched_get_time(void) 56 { 57 return PSCHED_NS2TICKS(ktime_get_ns()); 58 } 59 60 static inline psched_tdiff_t 61 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) 62 { 63 return min(tv1 - tv2, bound); 64 } 65 66 struct qdisc_watchdog { 67 u64 last_expires; 68 struct hrtimer timer; 69 struct Qdisc *qdisc; 70 }; 71 72 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, 73 clockid_t clockid); 74 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 75 76 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, 77 u64 delta_ns); 78 79 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, 80 u64 expires) 81 { 82 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL); 83 } 84 85 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 86 psched_time_t expires) 87 { 88 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); 89 } 90 91 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 92 93 extern struct Qdisc_ops pfifo_qdisc_ops; 94 extern struct Qdisc_ops bfifo_qdisc_ops; 95 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; 96 97 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 98 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 99 unsigned int limit, 100 struct netlink_ext_ack *extack); 101 102 int register_qdisc(struct Qdisc_ops *qops); 103 int unregister_qdisc(struct Qdisc_ops *qops); 104 void qdisc_get_default(char *id, size_t len); 105 int qdisc_set_default(const char *id); 106 107 void qdisc_hash_add(struct Qdisc *q, bool invisible); 108 void qdisc_hash_del(struct Qdisc *q); 109 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 110 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle); 111 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 112 struct nlattr *tab, 113 struct netlink_ext_ack *extack); 114 void qdisc_put_rtab(struct qdisc_rate_table *tab); 115 void qdisc_put_stab(struct qdisc_size_table *tab); 116 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 117 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 118 struct net_device *dev, struct netdev_queue *txq, 119 spinlock_t *root_lock, bool validate); 120 121 void __qdisc_run(struct Qdisc *q); 122 123 static inline void qdisc_run(struct Qdisc *q) 124 { 125 if (qdisc_run_begin(q)) { 126 /* NOLOCK qdisc must check 'state' under the qdisc seqlock 127 * to avoid racing with dev_qdisc_reset() 128 */ 129 if (!(q->flags & TCQ_F_NOLOCK) || 130 likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) 131 __qdisc_run(q); 132 qdisc_run_end(q); 133 } 134 } 135 136 /* Calculate maximal size of packet seen by hard_start_xmit 137 routine of this device. 138 */ 139 static inline unsigned int psched_mtu(const struct net_device *dev) 140 { 141 return dev->mtu + dev->hard_header_len; 142 } 143 144 static inline struct net *qdisc_net(struct Qdisc *q) 145 { 146 return dev_net(q->dev_queue->dev); 147 } 148 149 struct tc_cbs_qopt_offload { 150 u8 enable; 151 s32 queue; 152 s32 hicredit; 153 s32 locredit; 154 s32 idleslope; 155 s32 sendslope; 156 }; 157 158 struct tc_etf_qopt_offload { 159 u8 enable; 160 s32 queue; 161 }; 162 163 struct tc_taprio_sched_entry { 164 u8 command; /* TC_TAPRIO_CMD_* */ 165 166 /* The gate_mask in the offloading side refers to traffic classes */ 167 u32 gate_mask; 168 u32 interval; 169 }; 170 171 struct tc_taprio_qopt_offload { 172 u8 enable; 173 ktime_t base_time; 174 u64 cycle_time; 175 u64 cycle_time_extension; 176 177 size_t num_entries; 178 struct tc_taprio_sched_entry entries[]; 179 }; 180 181 /* Reference counting */ 182 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload 183 *offload); 184 void taprio_offload_free(struct tc_taprio_qopt_offload *offload); 185 186 #endif 187