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 #define qdisc_priv(q) \ 24 _Generic(q, \ 25 const struct Qdisc * : (const void *)&q->privdata, \ 26 struct Qdisc * : (void *)&q->privdata) 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 struct hrtimer timer; 68 struct Qdisc *qdisc; 69 }; 70 71 void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc, 72 clockid_t clockid); 73 void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc); 74 75 void qdisc_watchdog_schedule_range_ns(struct qdisc_watchdog *wd, u64 expires, 76 u64 delta_ns); 77 78 static inline void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, 79 u64 expires) 80 { 81 return qdisc_watchdog_schedule_range_ns(wd, expires, 0ULL); 82 } 83 84 static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, 85 psched_time_t expires) 86 { 87 qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires)); 88 } 89 90 void qdisc_watchdog_cancel(struct qdisc_watchdog *wd); 91 92 extern struct Qdisc_ops pfifo_qdisc_ops; 93 extern struct Qdisc_ops bfifo_qdisc_ops; 94 extern struct Qdisc_ops pfifo_head_drop_qdisc_ops; 95 96 int fifo_set_limit(struct Qdisc *q, unsigned int limit); 97 struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops, 98 unsigned int limit, 99 struct netlink_ext_ack *extack); 100 101 int register_qdisc(struct Qdisc_ops *qops); 102 void unregister_qdisc(struct Qdisc_ops *qops); 103 #define NET_SCH_ALIAS_PREFIX "net-sch-" 104 #define MODULE_ALIAS_NET_SCH(id) MODULE_ALIAS(NET_SCH_ALIAS_PREFIX id) 105 void qdisc_get_default(char *id, size_t len); 106 int qdisc_set_default(const char *id); 107 108 void qdisc_hash_add(struct Qdisc *q, bool invisible); 109 void qdisc_hash_del(struct Qdisc *q); 110 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 111 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle); 112 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 113 struct nlattr *tab, 114 struct netlink_ext_ack *extack); 115 void qdisc_put_rtab(struct qdisc_rate_table *tab); 116 void qdisc_put_stab(struct qdisc_size_table *tab); 117 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 118 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 119 struct net_device *dev, struct netdev_queue *txq, 120 spinlock_t *root_lock, bool validate); 121 122 void __qdisc_run(struct Qdisc *q); 123 124 static inline void qdisc_run(struct Qdisc *q) 125 { 126 if (qdisc_run_begin(q)) { 127 __qdisc_run(q); 128 qdisc_run_end(q); 129 } 130 } 131 132 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; 133 134 /* Calculate maximal size of packet seen by hard_start_xmit 135 routine of this device. 136 */ 137 static inline unsigned int psched_mtu(const struct net_device *dev) 138 { 139 return READ_ONCE(dev->mtu) + dev->hard_header_len; 140 } 141 142 static inline struct net *qdisc_net(struct Qdisc *q) 143 { 144 return dev_net(q->dev_queue->dev); 145 } 146 147 struct tc_query_caps_base { 148 enum tc_setup_type type; 149 void *caps; 150 }; 151 152 struct tc_cbs_qopt_offload { 153 u8 enable; 154 s32 queue; 155 s32 hicredit; 156 s32 locredit; 157 s32 idleslope; 158 s32 sendslope; 159 }; 160 161 struct tc_etf_qopt_offload { 162 u8 enable; 163 s32 queue; 164 }; 165 166 struct tc_mqprio_caps { 167 bool validate_queue_counts:1; 168 }; 169 170 struct tc_mqprio_qopt_offload { 171 /* struct tc_mqprio_qopt must always be the first element */ 172 struct tc_mqprio_qopt qopt; 173 struct netlink_ext_ack *extack; 174 u16 mode; 175 u16 shaper; 176 u32 flags; 177 u64 min_rate[TC_QOPT_MAX_QUEUE]; 178 u64 max_rate[TC_QOPT_MAX_QUEUE]; 179 unsigned long preemptible_tcs; 180 }; 181 182 struct tc_taprio_caps { 183 bool supports_queue_max_sdu:1; 184 bool gate_mask_per_txq:1; 185 /* Device expects lower TXQ numbers to have higher priority over higher 186 * TXQs, regardless of their TC mapping. DO NOT USE FOR NEW DRIVERS, 187 * INSTEAD ENFORCE A PROPER TC:TXQ MAPPING COMING FROM USER SPACE. 188 */ 189 bool broken_mqprio:1; 190 }; 191 192 enum tc_taprio_qopt_cmd { 193 TAPRIO_CMD_REPLACE, 194 TAPRIO_CMD_DESTROY, 195 TAPRIO_CMD_STATS, 196 TAPRIO_CMD_QUEUE_STATS, 197 }; 198 199 /** 200 * struct tc_taprio_qopt_stats - IEEE 802.1Qbv statistics 201 * @window_drops: Frames that were dropped because they were too large to be 202 * transmitted in any of the allotted time windows (open gates) for their 203 * traffic class. 204 * @tx_overruns: Frames still being transmitted by the MAC after the 205 * transmission gate associated with their traffic class has closed. 206 * Equivalent to `12.29.1.1.2 TransmissionOverrun` from 802.1Q-2018. 207 */ 208 struct tc_taprio_qopt_stats { 209 u64 window_drops; 210 u64 tx_overruns; 211 }; 212 213 struct tc_taprio_qopt_queue_stats { 214 int queue; 215 struct tc_taprio_qopt_stats stats; 216 }; 217 218 struct tc_taprio_sched_entry { 219 u8 command; /* TC_TAPRIO_CMD_* */ 220 221 /* The gate_mask in the offloading side refers to traffic classes */ 222 u32 gate_mask; 223 u32 interval; 224 }; 225 226 struct tc_taprio_qopt_offload { 227 enum tc_taprio_qopt_cmd cmd; 228 229 union { 230 /* TAPRIO_CMD_STATS */ 231 struct tc_taprio_qopt_stats stats; 232 /* TAPRIO_CMD_QUEUE_STATS */ 233 struct tc_taprio_qopt_queue_stats queue_stats; 234 /* TAPRIO_CMD_REPLACE */ 235 struct { 236 struct tc_mqprio_qopt_offload mqprio; 237 struct netlink_ext_ack *extack; 238 ktime_t base_time; 239 u64 cycle_time; 240 u64 cycle_time_extension; 241 u32 max_sdu[TC_MAX_QUEUE]; 242 243 size_t num_entries; 244 struct tc_taprio_sched_entry entries[]; 245 }; 246 }; 247 }; 248 249 #if IS_ENABLED(CONFIG_NET_SCH_TAPRIO) 250 251 /* Reference counting */ 252 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload 253 *offload); 254 void taprio_offload_free(struct tc_taprio_qopt_offload *offload); 255 256 #else 257 258 /* Reference counting */ 259 static inline struct tc_taprio_qopt_offload * 260 taprio_offload_get(struct tc_taprio_qopt_offload *offload) 261 { 262 return NULL; 263 } 264 265 static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload) 266 { 267 } 268 269 #endif 270 271 /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is 272 * not mistaken for a software timestamp, because this will otherwise prevent 273 * the dispatch of hardware timestamps to the socket. 274 */ 275 static inline void skb_txtime_consumed(struct sk_buff *skb) 276 { 277 skb->tstamp = ktime_set(0, 0); 278 } 279 280 static inline bool tc_qdisc_stats_dump(struct Qdisc *sch, 281 unsigned long cl, 282 struct qdisc_walker *arg) 283 { 284 if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) { 285 arg->stop = 1; 286 return false; 287 } 288 289 arg->count++; 290 return true; 291 } 292 293 #endif 294