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 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 void qdisc_get_default(char *id, size_t len); 104 int qdisc_set_default(const char *id); 105 106 void qdisc_hash_add(struct Qdisc *q, bool invisible); 107 void qdisc_hash_del(struct Qdisc *q); 108 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle); 109 struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle); 110 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, 111 struct nlattr *tab, 112 struct netlink_ext_ack *extack); 113 void qdisc_put_rtab(struct qdisc_rate_table *tab); 114 void qdisc_put_stab(struct qdisc_size_table *tab); 115 void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc); 116 bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q, 117 struct net_device *dev, struct netdev_queue *txq, 118 spinlock_t *root_lock, bool validate); 119 120 void __qdisc_run(struct Qdisc *q); 121 122 static inline void qdisc_run(struct Qdisc *q) 123 { 124 if (qdisc_run_begin(q)) { 125 __qdisc_run(q); 126 qdisc_run_end(q); 127 } 128 } 129 130 extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1]; 131 132 /* Calculate maximal size of packet seen by hard_start_xmit 133 routine of this device. 134 */ 135 static inline unsigned int psched_mtu(const struct net_device *dev) 136 { 137 return dev->mtu + dev->hard_header_len; 138 } 139 140 static inline struct net *qdisc_net(struct Qdisc *q) 141 { 142 return dev_net(q->dev_queue->dev); 143 } 144 145 struct tc_query_caps_base { 146 enum tc_setup_type type; 147 void *caps; 148 }; 149 150 struct tc_cbs_qopt_offload { 151 u8 enable; 152 s32 queue; 153 s32 hicredit; 154 s32 locredit; 155 s32 idleslope; 156 s32 sendslope; 157 }; 158 159 struct tc_etf_qopt_offload { 160 u8 enable; 161 s32 queue; 162 }; 163 164 struct tc_mqprio_caps { 165 bool validate_queue_counts:1; 166 }; 167 168 struct tc_mqprio_qopt_offload { 169 /* struct tc_mqprio_qopt must always be the first element */ 170 struct tc_mqprio_qopt qopt; 171 struct netlink_ext_ack *extack; 172 u16 mode; 173 u16 shaper; 174 u32 flags; 175 u64 min_rate[TC_QOPT_MAX_QUEUE]; 176 u64 max_rate[TC_QOPT_MAX_QUEUE]; 177 unsigned long preemptible_tcs; 178 }; 179 180 struct tc_taprio_caps { 181 bool supports_queue_max_sdu:1; 182 bool gate_mask_per_txq:1; 183 /* Device expects lower TXQ numbers to have higher priority over higher 184 * TXQs, regardless of their TC mapping. DO NOT USE FOR NEW DRIVERS, 185 * INSTEAD ENFORCE A PROPER TC:TXQ MAPPING COMING FROM USER SPACE. 186 */ 187 bool broken_mqprio:1; 188 }; 189 190 enum tc_taprio_qopt_cmd { 191 TAPRIO_CMD_REPLACE, 192 TAPRIO_CMD_DESTROY, 193 TAPRIO_CMD_STATS, 194 TAPRIO_CMD_QUEUE_STATS, 195 }; 196 197 /** 198 * struct tc_taprio_qopt_stats - IEEE 802.1Qbv statistics 199 * @window_drops: Frames that were dropped because they were too large to be 200 * transmitted in any of the allotted time windows (open gates) for their 201 * traffic class. 202 * @tx_overruns: Frames still being transmitted by the MAC after the 203 * transmission gate associated with their traffic class has closed. 204 * Equivalent to `12.29.1.1.2 TransmissionOverrun` from 802.1Q-2018. 205 */ 206 struct tc_taprio_qopt_stats { 207 u64 window_drops; 208 u64 tx_overruns; 209 }; 210 211 struct tc_taprio_qopt_queue_stats { 212 int queue; 213 struct tc_taprio_qopt_stats stats; 214 }; 215 216 struct tc_taprio_sched_entry { 217 u8 command; /* TC_TAPRIO_CMD_* */ 218 219 /* The gate_mask in the offloading side refers to traffic classes */ 220 u32 gate_mask; 221 u32 interval; 222 }; 223 224 struct tc_taprio_qopt_offload { 225 enum tc_taprio_qopt_cmd cmd; 226 227 union { 228 /* TAPRIO_CMD_STATS */ 229 struct tc_taprio_qopt_stats stats; 230 /* TAPRIO_CMD_QUEUE_STATS */ 231 struct tc_taprio_qopt_queue_stats queue_stats; 232 /* TAPRIO_CMD_REPLACE */ 233 struct { 234 struct tc_mqprio_qopt_offload mqprio; 235 struct netlink_ext_ack *extack; 236 ktime_t base_time; 237 u64 cycle_time; 238 u64 cycle_time_extension; 239 u32 max_sdu[TC_MAX_QUEUE]; 240 241 size_t num_entries; 242 struct tc_taprio_sched_entry entries[]; 243 }; 244 }; 245 }; 246 247 #if IS_ENABLED(CONFIG_NET_SCH_TAPRIO) 248 249 /* Reference counting */ 250 struct tc_taprio_qopt_offload *taprio_offload_get(struct tc_taprio_qopt_offload 251 *offload); 252 void taprio_offload_free(struct tc_taprio_qopt_offload *offload); 253 254 #else 255 256 /* Reference counting */ 257 static inline struct tc_taprio_qopt_offload * 258 taprio_offload_get(struct tc_taprio_qopt_offload *offload) 259 { 260 return NULL; 261 } 262 263 static inline void taprio_offload_free(struct tc_taprio_qopt_offload *offload) 264 { 265 } 266 267 #endif 268 269 /* Ensure skb_mstamp_ns, which might have been populated with the txtime, is 270 * not mistaken for a software timestamp, because this will otherwise prevent 271 * the dispatch of hardware timestamps to the socket. 272 */ 273 static inline void skb_txtime_consumed(struct sk_buff *skb) 274 { 275 skb->tstamp = ktime_set(0, 0); 276 } 277 278 struct tc_skb_cb { 279 struct qdisc_skb_cb qdisc_cb; 280 281 u16 mru; 282 u8 post_ct:1; 283 u8 post_ct_snat:1; 284 u8 post_ct_dnat:1; 285 u16 zone; /* Only valid if post_ct = true */ 286 }; 287 288 static inline struct tc_skb_cb *tc_skb_cb(const struct sk_buff *skb) 289 { 290 struct tc_skb_cb *cb = (struct tc_skb_cb *)skb->cb; 291 292 BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb)); 293 return cb; 294 } 295 296 static inline bool tc_qdisc_stats_dump(struct Qdisc *sch, 297 unsigned long cl, 298 struct qdisc_walker *arg) 299 { 300 if (arg->count >= arg->skip && arg->fn(sch, cl, arg) < 0) { 301 arg->stop = 1; 302 return false; 303 } 304 305 arg->count++; 306 return true; 307 } 308 309 #endif 310