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 static inline struct Qdisc *qdisc_from_priv(void *priv) 28 { 29 return container_of(priv, struct Qdisc, privdata); 30 } 31 32 /* 33 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 34 35 Normal IP packet size ~ 512byte, hence: 36 37 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 38 10Mbit ethernet. 39 40 10msec resolution -> <50Kbit/sec. 41 42 The result: [34]86 is not good choice for QoS router :-( 43 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. 47 */ 48 49 typedef u64 psched_time_t; 50 typedef long psched_tdiff_t; 51 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) 56 57 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 58 #define PSCHED_PASTPERFECT 0 59 60 static inline psched_time_t psched_get_time(void) 61 { 62 return PSCHED_NS2TICKS(ktime_get_ns()); 63 } 64 65 static inline psched_tdiff_t 66 psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound) 67 { 68 return min(tv1 - tv2, bound); 69 } 70 71 struct qdisc_watchdog { 72 u64 last_expires; 73 struct hrtimer timer; 74 struct Qdisc *qdisc; 75 }; 76 77 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, 78 clockid_t clockid); 79 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 80 81 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, 82 u64 delta_ns); 83 84 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, 85 u64 expires) 86 { 87 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL); 88 } 89 90 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 91 psched_time_t expires) 92 { 93 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); 94 } 95 96 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 97 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; 101 102 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 103 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 104 unsigned int limit, 105 struct netlink_ext_ack *extack); 106 107 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); 111 112 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, 117 struct nlattr *tab, 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); 125 126 void __qdisc_run(struct Qdisc *q); 127 128 static inline void qdisc_run(struct Qdisc *q) 129 { 130 if (qdisc_run_begin(q)) { 131 /* NOLOCK qdisc must check 'state' under the qdisc seqlock 132 * to avoid racing with dev_qdisc_reset() 133 */ 134 if (!(q->flags & TCQ_F_NOLOCK) || 135 likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) 136 __qdisc_run(q); 137 qdisc_run_end(q); 138 } 139 } 140 141 /* Calculate maximal size of packet seen by hard_start_xmit 142 routine of this device. 143 */ 144 static inline unsigned int psched_mtu(const struct net_device *dev) 145 { 146 return dev->mtu + dev->hard_header_len; 147 } 148 149 static inline struct net *qdisc_net(struct Qdisc *q) 150 { 151 return dev_net(q->dev_queue->dev); 152 } 153 154 struct tc_cbs_qopt_offload { 155 u8 enable; 156 s32 queue; 157 s32 hicredit; 158 s32 locredit; 159 s32 idleslope; 160 s32 sendslope; 161 }; 162 163 struct tc_etf_qopt_offload { 164 u8 enable; 165 s32 queue; 166 }; 167 168 struct tc_taprio_sched_entry { 169 u8 command; /* TC_TAPRIO_CMD_* */ 170 171 /* The gate_mask in the offloading side refers to traffic classes */ 172 u32 gate_mask; 173 u32 interval; 174 }; 175 176 struct tc_taprio_qopt_offload { 177 u8 enable; 178 ktime_t base_time; 179 u64 cycle_time; 180 u64 cycle_time_extension; 181 182 size_t num_entries; 183 struct tc_taprio_sched_entry entries[]; 184 }; 185 186 /* Reference counting */ 187 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload 188 *offload); 189 void taprio_offload_free(struct tc_taprio_qopt_offload *offload); 190 191 #endif 192