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 #define STAB_SIZE_LOG_MAX 30 15 16 struct qdisc_walker { 17 int stop; 18 int skip; 19 int count; 20 int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *); 21 }; 22 23 static inline void *qdisc_priv(struct Qdisc *q) 24 { 25 return &q->privdata; 26 } 27 28 static inline struct Qdisc *qdisc_from_priv(void *priv) 29 { 30 return container_of(priv, struct Qdisc, privdata); 31 } 32 33 /* 34 Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth 35 36 Normal IP packet size ~ 512byte, hence: 37 38 0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for 39 10Mbit ethernet. 40 41 10msec resolution -> <50Kbit/sec. 42 43 The result: [34]86 is not good choice for QoS router :-( 44 45 The things are not so bad, because we may use artificial 46 clock evaluated by integration of network data flow 47 in the most critical places. 48 */ 49 50 typedef u64 psched_time_t; 51 typedef long psched_tdiff_t; 52 53 /* Avoid doing 64 bit divide */ 54 #define PSCHED_SHIFT 6 55 #define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT) 56 #define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT) 57 58 #define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC) 59 #define PSCHED_PASTPERFECT 0 60 61 static inline psched_time_t psched_get_time(void) 62 { 63 return PSCHED_NS2TICKS(ktime_get_ns()); 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 __qdisc_run(q); 127 qdisc_run_end(q); 128 } 129 } 130 131 /* Calculate maximal size of packet seen by hard_start_xmit 132 routine of this device. 133 */ 134 static inline unsigned int psched_mtu(const struct net_device *dev) 135 { 136 return dev->mtu + dev->hard_header_len; 137 } 138 139 static inline struct net *qdisc_net(struct Qdisc *q) 140 { 141 return dev_net(q->dev_queue->dev); 142 } 143 144 struct tc_cbs_qopt_offload { 145 u8 enable; 146 s32 queue; 147 s32 hicredit; 148 s32 locredit; 149 s32 idleslope; 150 s32 sendslope; 151 }; 152 153 struct tc_etf_qopt_offload { 154 u8 enable; 155 s32 queue; 156 }; 157 158 struct tc_taprio_sched_entry { 159 u8 command; /* TC_TAPRIO_CMD_* */ 160 161 /* The gate_mask in the offloading side refers to traffic classes */ 162 u32 gate_mask; 163 u32 interval; 164 }; 165 166 struct tc_taprio_qopt_offload { 167 u8 enable; 168 ktime_t base_time; 169 u64 cycle_time; 170 u64 cycle_time_extension; 171 172 size_t num_entries; 173 struct tc_taprio_sched_entry entries[]; 174 }; 175 176 /* Reference counting */ 177 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload 178 *offload); 179 void taprio_offload_free(struct tc_taprio_qopt_offload *offload); 180 181 /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is 182 * not mistaken for a software timestamp, because this will otherwise prevent 183 * the dispatch of hardware timestamps to the socket. 184 */ 185 static inline void skb_txtime_consumed(struct sk_buff *skb) 186 { 187 skb->tstamp = ktime_set(0, 0); 188 } 189 190 struct tc_skb_cb { 191 struct qdisc_skb_cb qdisc_cb; 192 193 u16 mru; 194 u8 post_ct:1; 195 u8 post_ct_snat:1; 196 u8 post_ct_dnat:1; 197 u16 zone; /* Only valid if post_ct = true */ 198 }; 199 200 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 201 { 202 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 203 204 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 205 return cb; 206 } 207 208 #endif 209