Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_fq.c Fair Queue Packet Scheduler (per flow pacing) |
| 3 | * |
Eric Dumazet | 86b3bfe | 2015-01-28 06:06:36 -0800 | [diff] [blame] | 4 | * Copyright (C) 2013-2015 Eric Dumazet <edumazet@google.com> |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
Simon Horman | 05e8bb8 | 2015-04-02 11:20:23 +0900 | [diff] [blame] | 11 | * Meant to be mostly used for locally generated traffic : |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 12 | * Fast classification depends on skb->sk being set before reaching us. |
| 13 | * If not, (router workload), we use rxhash as fallback, with 32 bits wide hash. |
| 14 | * All packets belonging to a socket are considered as a 'flow'. |
| 15 | * |
| 16 | * Flows are dynamically allocated and stored in a hash table of RB trees |
| 17 | * They are also part of one Round Robin 'queues' (new or old flows) |
| 18 | * |
| 19 | * Burst avoidance (aka pacing) capability : |
| 20 | * |
| 21 | * Transport (eg TCP) can set in sk->sk_pacing_rate a rate, enqueue a |
| 22 | * bunch of packets, and this packet scheduler adds delay between |
| 23 | * packets to respect rate limitation. |
| 24 | * |
| 25 | * enqueue() : |
| 26 | * - lookup one RB tree (out of 1024 or more) to find the flow. |
| 27 | * If non existent flow, create it, add it to the tree. |
| 28 | * Add skb to the per flow list of skb (fifo). |
| 29 | * - Use a special fifo for high prio packets |
| 30 | * |
| 31 | * dequeue() : serves flows in Round Robin |
| 32 | * Note : When a flow becomes empty, we do not immediately remove it from |
| 33 | * rb trees, for performance reasons (its expected to send additional packets, |
| 34 | * or SLAB cache will reuse socket for another flow) |
| 35 | */ |
| 36 | |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/types.h> |
| 39 | #include <linux/kernel.h> |
| 40 | #include <linux/jiffies.h> |
| 41 | #include <linux/string.h> |
| 42 | #include <linux/in.h> |
| 43 | #include <linux/errno.h> |
| 44 | #include <linux/init.h> |
| 45 | #include <linux/skbuff.h> |
| 46 | #include <linux/slab.h> |
| 47 | #include <linux/rbtree.h> |
| 48 | #include <linux/hash.h> |
Eric Dumazet | 08f89b9 | 2013-08-30 09:46:43 -0700 | [diff] [blame] | 49 | #include <linux/prefetch.h> |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 50 | #include <linux/vmalloc.h> |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 51 | #include <net/netlink.h> |
| 52 | #include <net/pkt_sched.h> |
| 53 | #include <net/sock.h> |
| 54 | #include <net/tcp_states.h> |
Eric Dumazet | 9878196 | 2015-02-03 18:31:53 -0800 | [diff] [blame] | 55 | #include <net/tcp.h> |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * Per flow structure, dynamically allocated |
| 59 | */ |
| 60 | struct fq_flow { |
| 61 | struct sk_buff *head; /* list of skbs for this flow : first skb */ |
| 62 | union { |
| 63 | struct sk_buff *tail; /* last skb in the list */ |
| 64 | unsigned long age; /* jiffies when flow was emptied, for gc */ |
| 65 | }; |
Simon Horman | 05e8bb8 | 2015-04-02 11:20:23 +0900 | [diff] [blame] | 66 | struct rb_node fq_node; /* anchor in fq_root[] trees */ |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 67 | struct sock *sk; |
| 68 | int qlen; /* number of packets in flow queue */ |
| 69 | int credit; |
| 70 | u32 socket_hash; /* sk_hash */ |
| 71 | struct fq_flow *next; /* next pointer in RR lists, or &detached */ |
| 72 | |
| 73 | struct rb_node rate_node; /* anchor in q->delayed tree */ |
| 74 | u64 time_next_packet; |
| 75 | }; |
| 76 | |
| 77 | struct fq_flow_head { |
| 78 | struct fq_flow *first; |
| 79 | struct fq_flow *last; |
| 80 | }; |
| 81 | |
| 82 | struct fq_sched_data { |
| 83 | struct fq_flow_head new_flows; |
| 84 | |
| 85 | struct fq_flow_head old_flows; |
| 86 | |
| 87 | struct rb_root delayed; /* for rate limited flows */ |
| 88 | u64 time_next_delayed_flow; |
Eric Dumazet | fefa569 | 2016-09-22 08:58:55 -0700 | [diff] [blame] | 89 | unsigned long unthrottle_latency_ns; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 90 | |
| 91 | struct fq_flow internal; /* for non classified or high prio packets */ |
| 92 | u32 quantum; |
| 93 | u32 initial_quantum; |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 94 | u32 flow_refill_delay; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 95 | u32 flow_max_rate; /* optional max rate per flow */ |
| 96 | u32 flow_plimit; /* max packets per flow */ |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 97 | u32 orphan_mask; /* mask for orphaned skb */ |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 98 | u32 low_rate_threshold; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 99 | struct rb_root *fq_root; |
| 100 | u8 rate_enable; |
| 101 | u8 fq_trees_log; |
| 102 | |
| 103 | u32 flows; |
| 104 | u32 inactive_flows; |
| 105 | u32 throttled_flows; |
| 106 | |
| 107 | u64 stat_gc_flows; |
| 108 | u64 stat_internal_packets; |
| 109 | u64 stat_tcp_retrans; |
| 110 | u64 stat_throttled; |
| 111 | u64 stat_flows_plimit; |
| 112 | u64 stat_pkts_too_long; |
| 113 | u64 stat_allocation_errors; |
| 114 | struct qdisc_watchdog watchdog; |
| 115 | }; |
| 116 | |
| 117 | /* special value to mark a detached flow (not on old/new list) */ |
| 118 | static struct fq_flow detached, throttled; |
| 119 | |
| 120 | static void fq_flow_set_detached(struct fq_flow *f) |
| 121 | { |
| 122 | f->next = &detached; |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 123 | f->age = jiffies; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | static bool fq_flow_is_detached(const struct fq_flow *f) |
| 127 | { |
| 128 | return f->next == &detached; |
| 129 | } |
| 130 | |
| 131 | static void fq_flow_set_throttled(struct fq_sched_data *q, struct fq_flow *f) |
| 132 | { |
| 133 | struct rb_node **p = &q->delayed.rb_node, *parent = NULL; |
| 134 | |
| 135 | while (*p) { |
| 136 | struct fq_flow *aux; |
| 137 | |
| 138 | parent = *p; |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 139 | aux = rb_entry(parent, struct fq_flow, rate_node); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 140 | if (f->time_next_packet >= aux->time_next_packet) |
| 141 | p = &parent->rb_right; |
| 142 | else |
| 143 | p = &parent->rb_left; |
| 144 | } |
| 145 | rb_link_node(&f->rate_node, parent, p); |
| 146 | rb_insert_color(&f->rate_node, &q->delayed); |
| 147 | q->throttled_flows++; |
| 148 | q->stat_throttled++; |
| 149 | |
| 150 | f->next = &throttled; |
| 151 | if (q->time_next_delayed_flow > f->time_next_packet) |
| 152 | q->time_next_delayed_flow = f->time_next_packet; |
| 153 | } |
| 154 | |
| 155 | |
| 156 | static struct kmem_cache *fq_flow_cachep __read_mostly; |
| 157 | |
| 158 | static void fq_flow_add_tail(struct fq_flow_head *head, struct fq_flow *flow) |
| 159 | { |
| 160 | if (head->first) |
| 161 | head->last->next = flow; |
| 162 | else |
| 163 | head->first = flow; |
| 164 | head->last = flow; |
| 165 | flow->next = NULL; |
| 166 | } |
| 167 | |
| 168 | /* limit number of collected flows per round */ |
| 169 | #define FQ_GC_MAX 8 |
| 170 | #define FQ_GC_AGE (3*HZ) |
| 171 | |
| 172 | static bool fq_gc_candidate(const struct fq_flow *f) |
| 173 | { |
| 174 | return fq_flow_is_detached(f) && |
| 175 | time_after(jiffies, f->age + FQ_GC_AGE); |
| 176 | } |
| 177 | |
| 178 | static void fq_gc(struct fq_sched_data *q, |
| 179 | struct rb_root *root, |
| 180 | struct sock *sk) |
| 181 | { |
| 182 | struct fq_flow *f, *tofree[FQ_GC_MAX]; |
| 183 | struct rb_node **p, *parent; |
| 184 | int fcnt = 0; |
| 185 | |
| 186 | p = &root->rb_node; |
| 187 | parent = NULL; |
| 188 | while (*p) { |
| 189 | parent = *p; |
| 190 | |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 191 | f = rb_entry(parent, struct fq_flow, fq_node); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 192 | if (f->sk == sk) |
| 193 | break; |
| 194 | |
| 195 | if (fq_gc_candidate(f)) { |
| 196 | tofree[fcnt++] = f; |
| 197 | if (fcnt == FQ_GC_MAX) |
| 198 | break; |
| 199 | } |
| 200 | |
| 201 | if (f->sk > sk) |
| 202 | p = &parent->rb_right; |
| 203 | else |
| 204 | p = &parent->rb_left; |
| 205 | } |
| 206 | |
| 207 | q->flows -= fcnt; |
| 208 | q->inactive_flows -= fcnt; |
| 209 | q->stat_gc_flows += fcnt; |
| 210 | while (fcnt) { |
| 211 | struct fq_flow *f = tofree[--fcnt]; |
| 212 | |
| 213 | rb_erase(&f->fq_node, root); |
| 214 | kmem_cache_free(fq_flow_cachep, f); |
| 215 | } |
| 216 | } |
| 217 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 218 | static struct fq_flow *fq_classify(struct sk_buff *skb, struct fq_sched_data *q) |
| 219 | { |
| 220 | struct rb_node **p, *parent; |
| 221 | struct sock *sk = skb->sk; |
| 222 | struct rb_root *root; |
| 223 | struct fq_flow *f; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 224 | |
| 225 | /* warning: no starvation prevention... */ |
Maciej Żenczykowski | 2abc2f0 | 2013-11-14 08:50:43 -0800 | [diff] [blame] | 226 | if (unlikely((skb->priority & TC_PRIO_MAX) == TC_PRIO_CONTROL)) |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 227 | return &q->internal; |
| 228 | |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 229 | /* SYNACK messages are attached to a TCP_NEW_SYN_RECV request socket |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 230 | * or a listener (SYNCOOKIE mode) |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 231 | * 1) request sockets are not full blown, |
| 232 | * they do not contain sk_pacing_rate |
| 233 | * 2) They are not part of a 'flow' yet |
| 234 | * 3) We do not want to rate limit them (eg SYNFLOOD attack), |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 235 | * especially if the listener set SO_MAX_PACING_RATE |
Eric Dumazet | ca6fb06 | 2015-10-02 11:43:35 -0700 | [diff] [blame] | 236 | * 4) We pretend they are orphaned |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 237 | */ |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 238 | if (!sk || sk_listener(sk)) { |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 239 | unsigned long hash = skb_get_hash(skb) & q->orphan_mask; |
| 240 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 241 | /* By forcing low order bit to 1, we make sure to not |
| 242 | * collide with a local flow (socket pointers are word aligned) |
| 243 | */ |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 244 | sk = (struct sock *)((hash << 1) | 1UL); |
| 245 | skb_orphan(skb); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 246 | } |
| 247 | |
Eric Dumazet | 29c5847 | 2016-11-17 09:48:30 -0800 | [diff] [blame] | 248 | root = &q->fq_root[hash_ptr(sk, q->fq_trees_log)]; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 249 | |
| 250 | if (q->flows >= (2U << q->fq_trees_log) && |
| 251 | q->inactive_flows > q->flows/2) |
| 252 | fq_gc(q, root, sk); |
| 253 | |
| 254 | p = &root->rb_node; |
| 255 | parent = NULL; |
| 256 | while (*p) { |
| 257 | parent = *p; |
| 258 | |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 259 | f = rb_entry(parent, struct fq_flow, fq_node); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 260 | if (f->sk == sk) { |
| 261 | /* socket might have been reallocated, so check |
| 262 | * if its sk_hash is the same. |
| 263 | * It not, we need to refill credit with |
| 264 | * initial quantum |
| 265 | */ |
| 266 | if (unlikely(skb->sk && |
| 267 | f->socket_hash != sk->sk_hash)) { |
| 268 | f->credit = q->initial_quantum; |
| 269 | f->socket_hash = sk->sk_hash; |
Eric Dumazet | fc59d5b | 2013-10-27 16:26:43 -0700 | [diff] [blame] | 270 | f->time_next_packet = 0ULL; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 271 | } |
| 272 | return f; |
| 273 | } |
| 274 | if (f->sk > sk) |
| 275 | p = &parent->rb_right; |
| 276 | else |
| 277 | p = &parent->rb_left; |
| 278 | } |
| 279 | |
| 280 | f = kmem_cache_zalloc(fq_flow_cachep, GFP_ATOMIC | __GFP_NOWARN); |
| 281 | if (unlikely(!f)) { |
| 282 | q->stat_allocation_errors++; |
| 283 | return &q->internal; |
| 284 | } |
| 285 | fq_flow_set_detached(f); |
| 286 | f->sk = sk; |
| 287 | if (skb->sk) |
| 288 | f->socket_hash = sk->sk_hash; |
| 289 | f->credit = q->initial_quantum; |
| 290 | |
| 291 | rb_link_node(&f->fq_node, parent, p); |
| 292 | rb_insert_color(&f->fq_node, root); |
| 293 | |
| 294 | q->flows++; |
| 295 | q->inactive_flows++; |
| 296 | return f; |
| 297 | } |
| 298 | |
| 299 | |
| 300 | /* remove one skb from head of flow queue */ |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 301 | static struct sk_buff *fq_dequeue_head(struct Qdisc *sch, struct fq_flow *flow) |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 302 | { |
| 303 | struct sk_buff *skb = flow->head; |
| 304 | |
| 305 | if (skb) { |
| 306 | flow->head = skb->next; |
| 307 | skb->next = NULL; |
| 308 | flow->qlen--; |
John Fastabend | 25331d6 | 2014-09-28 11:53:29 -0700 | [diff] [blame] | 309 | qdisc_qstats_backlog_dec(sch, skb); |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 310 | sch->q.qlen--; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 311 | } |
| 312 | return skb; |
| 313 | } |
| 314 | |
| 315 | /* We might add in the future detection of retransmits |
| 316 | * For the time being, just return false |
| 317 | */ |
| 318 | static bool skb_is_retransmit(struct sk_buff *skb) |
| 319 | { |
| 320 | return false; |
| 321 | } |
| 322 | |
| 323 | /* add skb to flow queue |
| 324 | * flow queue is a linked list, kind of FIFO, except for TCP retransmits |
| 325 | * We special case tcp retransmits to be transmitted before other packets. |
| 326 | * We rely on fact that TCP retransmits are unlikely, so we do not waste |
| 327 | * a separate queue or a pointer. |
| 328 | * head-> [retrans pkt 1] |
| 329 | * [retrans pkt 2] |
| 330 | * [ normal pkt 1] |
| 331 | * [ normal pkt 2] |
| 332 | * [ normal pkt 3] |
| 333 | * tail-> [ normal pkt 4] |
| 334 | */ |
| 335 | static void flow_queue_add(struct fq_flow *flow, struct sk_buff *skb) |
| 336 | { |
| 337 | struct sk_buff *prev, *head = flow->head; |
| 338 | |
| 339 | skb->next = NULL; |
| 340 | if (!head) { |
| 341 | flow->head = skb; |
| 342 | flow->tail = skb; |
| 343 | return; |
| 344 | } |
| 345 | if (likely(!skb_is_retransmit(skb))) { |
| 346 | flow->tail->next = skb; |
| 347 | flow->tail = skb; |
| 348 | return; |
| 349 | } |
| 350 | |
| 351 | /* This skb is a tcp retransmit, |
| 352 | * find the last retrans packet in the queue |
| 353 | */ |
| 354 | prev = NULL; |
| 355 | while (skb_is_retransmit(head)) { |
| 356 | prev = head; |
| 357 | head = head->next; |
| 358 | if (!head) |
| 359 | break; |
| 360 | } |
| 361 | if (!prev) { /* no rtx packet in queue, become the new head */ |
| 362 | skb->next = flow->head; |
| 363 | flow->head = skb; |
| 364 | } else { |
| 365 | if (prev == flow->tail) |
| 366 | flow->tail = skb; |
| 367 | else |
| 368 | skb->next = prev->next; |
| 369 | prev->next = skb; |
| 370 | } |
| 371 | } |
| 372 | |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 373 | static int fq_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
| 374 | struct sk_buff **to_free) |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 375 | { |
| 376 | struct fq_sched_data *q = qdisc_priv(sch); |
| 377 | struct fq_flow *f; |
| 378 | |
| 379 | if (unlikely(sch->q.qlen >= sch->limit)) |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 380 | return qdisc_drop(skb, sch, to_free); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 381 | |
| 382 | f = fq_classify(skb, q); |
| 383 | if (unlikely(f->qlen >= q->flow_plimit && f != &q->internal)) { |
| 384 | q->stat_flows_plimit++; |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 385 | return qdisc_drop(skb, sch, to_free); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 386 | } |
| 387 | |
| 388 | f->qlen++; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 389 | if (skb_is_retransmit(skb)) |
| 390 | q->stat_tcp_retrans++; |
John Fastabend | 25331d6 | 2014-09-28 11:53:29 -0700 | [diff] [blame] | 391 | qdisc_qstats_backlog_inc(sch, skb); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 392 | if (fq_flow_is_detached(f)) { |
| 393 | fq_flow_add_tail(&q->new_flows, f); |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 394 | if (time_after(jiffies, f->age + q->flow_refill_delay)) |
| 395 | f->credit = max_t(u32, f->credit, q->quantum); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 396 | q->inactive_flows--; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 397 | } |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 398 | |
| 399 | /* Note: this overwrites f->age */ |
| 400 | flow_queue_add(f, skb); |
| 401 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 402 | if (unlikely(f == &q->internal)) { |
| 403 | q->stat_internal_packets++; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 404 | } |
| 405 | sch->q.qlen++; |
| 406 | |
| 407 | return NET_XMIT_SUCCESS; |
| 408 | } |
| 409 | |
| 410 | static void fq_check_throttled(struct fq_sched_data *q, u64 now) |
| 411 | { |
Eric Dumazet | fefa569 | 2016-09-22 08:58:55 -0700 | [diff] [blame] | 412 | unsigned long sample; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 413 | struct rb_node *p; |
| 414 | |
| 415 | if (q->time_next_delayed_flow > now) |
| 416 | return; |
| 417 | |
Eric Dumazet | fefa569 | 2016-09-22 08:58:55 -0700 | [diff] [blame] | 418 | /* Update unthrottle latency EWMA. |
| 419 | * This is cheap and can help diagnosing timer/latency problems. |
| 420 | */ |
| 421 | sample = (unsigned long)(now - q->time_next_delayed_flow); |
| 422 | q->unthrottle_latency_ns -= q->unthrottle_latency_ns >> 3; |
| 423 | q->unthrottle_latency_ns += sample >> 3; |
| 424 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 425 | q->time_next_delayed_flow = ~0ULL; |
| 426 | while ((p = rb_first(&q->delayed)) != NULL) { |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 427 | struct fq_flow *f = rb_entry(p, struct fq_flow, rate_node); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 428 | |
| 429 | if (f->time_next_packet > now) { |
| 430 | q->time_next_delayed_flow = f->time_next_packet; |
| 431 | break; |
| 432 | } |
| 433 | rb_erase(p, &q->delayed); |
| 434 | q->throttled_flows--; |
| 435 | fq_flow_add_tail(&q->old_flows, f); |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | static struct sk_buff *fq_dequeue(struct Qdisc *sch) |
| 440 | { |
| 441 | struct fq_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | d2de875 | 2014-08-22 18:32:09 -0700 | [diff] [blame] | 442 | u64 now = ktime_get_ns(); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 443 | struct fq_flow_head *head; |
| 444 | struct sk_buff *skb; |
| 445 | struct fq_flow *f; |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 446 | u32 rate, plen; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 447 | |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 448 | skb = fq_dequeue_head(sch, &q->internal); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 449 | if (skb) |
| 450 | goto out; |
| 451 | fq_check_throttled(q, now); |
| 452 | begin: |
| 453 | head = &q->new_flows; |
| 454 | if (!head->first) { |
| 455 | head = &q->old_flows; |
| 456 | if (!head->first) { |
| 457 | if (q->time_next_delayed_flow != ~0ULL) |
| 458 | qdisc_watchdog_schedule_ns(&q->watchdog, |
Eric Dumazet | 45f50be | 2016-06-10 16:41:39 -0700 | [diff] [blame] | 459 | q->time_next_delayed_flow); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 460 | return NULL; |
| 461 | } |
| 462 | } |
| 463 | f = head->first; |
| 464 | |
| 465 | if (f->credit <= 0) { |
| 466 | f->credit += q->quantum; |
| 467 | head->first = f->next; |
| 468 | fq_flow_add_tail(&q->old_flows, f); |
| 469 | goto begin; |
| 470 | } |
| 471 | |
Eric Dumazet | 9878196 | 2015-02-03 18:31:53 -0800 | [diff] [blame] | 472 | skb = f->head; |
| 473 | if (unlikely(skb && now < f->time_next_packet && |
| 474 | !skb_is_tcp_pure_ack(skb))) { |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 475 | head->first = f->next; |
| 476 | fq_flow_set_throttled(q, f); |
| 477 | goto begin; |
| 478 | } |
| 479 | |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 480 | skb = fq_dequeue_head(sch, f); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 481 | if (!skb) { |
| 482 | head->first = f->next; |
| 483 | /* force a pass through old_flows to prevent starvation */ |
| 484 | if ((head == &q->new_flows) && q->old_flows.first) { |
| 485 | fq_flow_add_tail(&q->old_flows, f); |
| 486 | } else { |
| 487 | fq_flow_set_detached(f); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 488 | q->inactive_flows++; |
| 489 | } |
| 490 | goto begin; |
| 491 | } |
Eric Dumazet | 08f89b9 | 2013-08-30 09:46:43 -0700 | [diff] [blame] | 492 | prefetch(&skb->end); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 493 | f->credit -= qdisc_pkt_len(skb); |
| 494 | |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 495 | if (!q->rate_enable) |
Eric Dumazet | 0eab5eb | 2013-10-01 09:10:16 -0700 | [diff] [blame] | 496 | goto out; |
| 497 | |
Eric Dumazet | 9878196 | 2015-02-03 18:31:53 -0800 | [diff] [blame] | 498 | /* Do not pace locally generated ack packets */ |
| 499 | if (skb_is_tcp_pure_ack(skb)) |
| 500 | goto out; |
| 501 | |
Eric Dumazet | 7eec417 | 2013-10-08 15:16:00 -0700 | [diff] [blame] | 502 | rate = q->flow_max_rate; |
Eric Dumazet | 86b3bfe | 2015-01-28 06:06:36 -0800 | [diff] [blame] | 503 | if (skb->sk) |
Eric Dumazet | 7eec417 | 2013-10-08 15:16:00 -0700 | [diff] [blame] | 504 | rate = min(skb->sk->sk_pacing_rate, rate); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 505 | |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 506 | if (rate <= q->low_rate_threshold) { |
| 507 | f->credit = 0; |
| 508 | plen = qdisc_pkt_len(skb); |
| 509 | } else { |
| 510 | plen = max(qdisc_pkt_len(skb), q->quantum); |
| 511 | if (f->credit > 0) |
| 512 | goto out; |
| 513 | } |
Eric Dumazet | 7eec417 | 2013-10-08 15:16:00 -0700 | [diff] [blame] | 514 | if (rate != ~0U) { |
Eric Dumazet | 0eab5eb | 2013-10-01 09:10:16 -0700 | [diff] [blame] | 515 | u64 len = (u64)plen * NSEC_PER_SEC; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 516 | |
Eric Dumazet | 7eec417 | 2013-10-08 15:16:00 -0700 | [diff] [blame] | 517 | if (likely(rate)) |
| 518 | do_div(len, rate); |
Eric Dumazet | 0eab5eb | 2013-10-01 09:10:16 -0700 | [diff] [blame] | 519 | /* Since socket rate can change later, |
Eric Dumazet | ced7a04 | 2014-11-25 08:57:29 -0800 | [diff] [blame] | 520 | * clamp the delay to 1 second. |
| 521 | * Really, providers of too big packets should be fixed ! |
Eric Dumazet | 0eab5eb | 2013-10-01 09:10:16 -0700 | [diff] [blame] | 522 | */ |
Eric Dumazet | ced7a04 | 2014-11-25 08:57:29 -0800 | [diff] [blame] | 523 | if (unlikely(len > NSEC_PER_SEC)) { |
| 524 | len = NSEC_PER_SEC; |
Eric Dumazet | 0eab5eb | 2013-10-01 09:10:16 -0700 | [diff] [blame] | 525 | q->stat_pkts_too_long++; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 526 | } |
Eric Dumazet | fefa569 | 2016-09-22 08:58:55 -0700 | [diff] [blame] | 527 | /* Account for schedule/timers drifts. |
| 528 | * f->time_next_packet was set when prior packet was sent, |
| 529 | * and current time (@now) can be too late by tens of us. |
| 530 | */ |
| 531 | if (f->time_next_packet) |
| 532 | len -= min(len/2, now - f->time_next_packet); |
Eric Dumazet | 0eab5eb | 2013-10-01 09:10:16 -0700 | [diff] [blame] | 533 | f->time_next_packet = now + len; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 534 | } |
| 535 | out: |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 536 | qdisc_bstats_update(sch, skb); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 537 | return skb; |
| 538 | } |
| 539 | |
Eric Dumazet | e14ffdf | 2016-06-13 20:21:53 -0700 | [diff] [blame] | 540 | static void fq_flow_purge(struct fq_flow *flow) |
| 541 | { |
| 542 | rtnl_kfree_skbs(flow->head, flow->tail); |
| 543 | flow->head = NULL; |
| 544 | flow->qlen = 0; |
| 545 | } |
| 546 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 547 | static void fq_reset(struct Qdisc *sch) |
| 548 | { |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 549 | struct fq_sched_data *q = qdisc_priv(sch); |
| 550 | struct rb_root *root; |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 551 | struct rb_node *p; |
| 552 | struct fq_flow *f; |
| 553 | unsigned int idx; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 554 | |
Eric Dumazet | e14ffdf | 2016-06-13 20:21:53 -0700 | [diff] [blame] | 555 | sch->q.qlen = 0; |
| 556 | sch->qstats.backlog = 0; |
| 557 | |
| 558 | fq_flow_purge(&q->internal); |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 559 | |
| 560 | if (!q->fq_root) |
| 561 | return; |
| 562 | |
| 563 | for (idx = 0; idx < (1U << q->fq_trees_log); idx++) { |
| 564 | root = &q->fq_root[idx]; |
| 565 | while ((p = rb_first(root)) != NULL) { |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 566 | f = rb_entry(p, struct fq_flow, fq_node); |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 567 | rb_erase(p, root); |
| 568 | |
Eric Dumazet | e14ffdf | 2016-06-13 20:21:53 -0700 | [diff] [blame] | 569 | fq_flow_purge(f); |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 570 | |
| 571 | kmem_cache_free(fq_flow_cachep, f); |
| 572 | } |
| 573 | } |
| 574 | q->new_flows.first = NULL; |
| 575 | q->old_flows.first = NULL; |
| 576 | q->delayed = RB_ROOT; |
| 577 | q->flows = 0; |
| 578 | q->inactive_flows = 0; |
| 579 | q->throttled_flows = 0; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | static void fq_rehash(struct fq_sched_data *q, |
| 583 | struct rb_root *old_array, u32 old_log, |
| 584 | struct rb_root *new_array, u32 new_log) |
| 585 | { |
| 586 | struct rb_node *op, **np, *parent; |
| 587 | struct rb_root *oroot, *nroot; |
| 588 | struct fq_flow *of, *nf; |
| 589 | int fcnt = 0; |
| 590 | u32 idx; |
| 591 | |
| 592 | for (idx = 0; idx < (1U << old_log); idx++) { |
| 593 | oroot = &old_array[idx]; |
| 594 | while ((op = rb_first(oroot)) != NULL) { |
| 595 | rb_erase(op, oroot); |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 596 | of = rb_entry(op, struct fq_flow, fq_node); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 597 | if (fq_gc_candidate(of)) { |
| 598 | fcnt++; |
| 599 | kmem_cache_free(fq_flow_cachep, of); |
| 600 | continue; |
| 601 | } |
Eric Dumazet | 29c5847 | 2016-11-17 09:48:30 -0800 | [diff] [blame] | 602 | nroot = &new_array[hash_ptr(of->sk, new_log)]; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 603 | |
| 604 | np = &nroot->rb_node; |
| 605 | parent = NULL; |
| 606 | while (*np) { |
| 607 | parent = *np; |
| 608 | |
Geliang Tang | e124557 | 2016-12-20 22:02:15 +0800 | [diff] [blame] | 609 | nf = rb_entry(parent, struct fq_flow, fq_node); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 610 | BUG_ON(nf->sk == of->sk); |
| 611 | |
| 612 | if (nf->sk > of->sk) |
| 613 | np = &parent->rb_right; |
| 614 | else |
| 615 | np = &parent->rb_left; |
| 616 | } |
| 617 | |
| 618 | rb_link_node(&of->fq_node, parent, np); |
| 619 | rb_insert_color(&of->fq_node, nroot); |
| 620 | } |
| 621 | } |
| 622 | q->flows -= fcnt; |
| 623 | q->inactive_flows -= fcnt; |
| 624 | q->stat_gc_flows += fcnt; |
| 625 | } |
| 626 | |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 627 | static void *fq_alloc_node(size_t sz, int node) |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 628 | { |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 629 | void *ptr; |
| 630 | |
| 631 | ptr = kmalloc_node(sz, GFP_KERNEL | __GFP_REPEAT | __GFP_NOWARN, node); |
| 632 | if (!ptr) |
| 633 | ptr = vmalloc_node(sz, node); |
| 634 | return ptr; |
| 635 | } |
| 636 | |
| 637 | static void fq_free(void *addr) |
| 638 | { |
WANG Cong | 4cb2897 | 2014-06-02 15:55:22 -0700 | [diff] [blame] | 639 | kvfree(addr); |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | static int fq_resize(struct Qdisc *sch, u32 log) |
| 643 | { |
| 644 | struct fq_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 645 | struct rb_root *array; |
Eric Dumazet | 2d8d40a | 2014-03-06 22:57:52 -0800 | [diff] [blame] | 646 | void *old_fq_root; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 647 | u32 idx; |
| 648 | |
| 649 | if (q->fq_root && log == q->fq_trees_log) |
| 650 | return 0; |
| 651 | |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 652 | /* If XPS was setup, we can allocate memory on right NUMA node */ |
| 653 | array = fq_alloc_node(sizeof(struct rb_root) << log, |
| 654 | netdev_queue_numa_node_read(sch->dev_queue)); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 655 | if (!array) |
| 656 | return -ENOMEM; |
| 657 | |
| 658 | for (idx = 0; idx < (1U << log); idx++) |
| 659 | array[idx] = RB_ROOT; |
| 660 | |
Eric Dumazet | 2d8d40a | 2014-03-06 22:57:52 -0800 | [diff] [blame] | 661 | sch_tree_lock(sch); |
| 662 | |
| 663 | old_fq_root = q->fq_root; |
| 664 | if (old_fq_root) |
| 665 | fq_rehash(q, old_fq_root, q->fq_trees_log, array, log); |
| 666 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 667 | q->fq_root = array; |
| 668 | q->fq_trees_log = log; |
| 669 | |
Eric Dumazet | 2d8d40a | 2014-03-06 22:57:52 -0800 | [diff] [blame] | 670 | sch_tree_unlock(sch); |
| 671 | |
| 672 | fq_free(old_fq_root); |
| 673 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | static const struct nla_policy fq_policy[TCA_FQ_MAX + 1] = { |
| 678 | [TCA_FQ_PLIMIT] = { .type = NLA_U32 }, |
| 679 | [TCA_FQ_FLOW_PLIMIT] = { .type = NLA_U32 }, |
| 680 | [TCA_FQ_QUANTUM] = { .type = NLA_U32 }, |
| 681 | [TCA_FQ_INITIAL_QUANTUM] = { .type = NLA_U32 }, |
| 682 | [TCA_FQ_RATE_ENABLE] = { .type = NLA_U32 }, |
| 683 | [TCA_FQ_FLOW_DEFAULT_RATE] = { .type = NLA_U32 }, |
| 684 | [TCA_FQ_FLOW_MAX_RATE] = { .type = NLA_U32 }, |
| 685 | [TCA_FQ_BUCKETS_LOG] = { .type = NLA_U32 }, |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 686 | [TCA_FQ_FLOW_REFILL_DELAY] = { .type = NLA_U32 }, |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 687 | [TCA_FQ_LOW_RATE_THRESHOLD] = { .type = NLA_U32 }, |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 688 | }; |
| 689 | |
| 690 | static int fq_change(struct Qdisc *sch, struct nlattr *opt) |
| 691 | { |
| 692 | struct fq_sched_data *q = qdisc_priv(sch); |
| 693 | struct nlattr *tb[TCA_FQ_MAX + 1]; |
| 694 | int err, drop_count = 0; |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 695 | unsigned drop_len = 0; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 696 | u32 fq_log; |
| 697 | |
| 698 | if (!opt) |
| 699 | return -EINVAL; |
| 700 | |
| 701 | err = nla_parse_nested(tb, TCA_FQ_MAX, opt, fq_policy); |
| 702 | if (err < 0) |
| 703 | return err; |
| 704 | |
| 705 | sch_tree_lock(sch); |
| 706 | |
| 707 | fq_log = q->fq_trees_log; |
| 708 | |
| 709 | if (tb[TCA_FQ_BUCKETS_LOG]) { |
| 710 | u32 nval = nla_get_u32(tb[TCA_FQ_BUCKETS_LOG]); |
| 711 | |
| 712 | if (nval >= 1 && nval <= ilog2(256*1024)) |
| 713 | fq_log = nval; |
| 714 | else |
| 715 | err = -EINVAL; |
| 716 | } |
| 717 | if (tb[TCA_FQ_PLIMIT]) |
| 718 | sch->limit = nla_get_u32(tb[TCA_FQ_PLIMIT]); |
| 719 | |
| 720 | if (tb[TCA_FQ_FLOW_PLIMIT]) |
| 721 | q->flow_plimit = nla_get_u32(tb[TCA_FQ_FLOW_PLIMIT]); |
| 722 | |
Kenneth Klette Jonassen | 3725a26 | 2015-02-03 17:49:18 +0100 | [diff] [blame] | 723 | if (tb[TCA_FQ_QUANTUM]) { |
| 724 | u32 quantum = nla_get_u32(tb[TCA_FQ_QUANTUM]); |
| 725 | |
| 726 | if (quantum > 0) |
| 727 | q->quantum = quantum; |
| 728 | else |
| 729 | err = -EINVAL; |
| 730 | } |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 731 | |
| 732 | if (tb[TCA_FQ_INITIAL_QUANTUM]) |
Eric Dumazet | ede869c | 2013-10-07 12:50:18 -0700 | [diff] [blame] | 733 | q->initial_quantum = nla_get_u32(tb[TCA_FQ_INITIAL_QUANTUM]); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 734 | |
| 735 | if (tb[TCA_FQ_FLOW_DEFAULT_RATE]) |
Eric Dumazet | 65c5189 | 2013-11-15 08:57:26 -0800 | [diff] [blame] | 736 | pr_warn_ratelimited("sch_fq: defrate %u ignored.\n", |
| 737 | nla_get_u32(tb[TCA_FQ_FLOW_DEFAULT_RATE])); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 738 | |
| 739 | if (tb[TCA_FQ_FLOW_MAX_RATE]) |
| 740 | q->flow_max_rate = nla_get_u32(tb[TCA_FQ_FLOW_MAX_RATE]); |
| 741 | |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 742 | if (tb[TCA_FQ_LOW_RATE_THRESHOLD]) |
| 743 | q->low_rate_threshold = |
| 744 | nla_get_u32(tb[TCA_FQ_LOW_RATE_THRESHOLD]); |
| 745 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 746 | if (tb[TCA_FQ_RATE_ENABLE]) { |
| 747 | u32 enable = nla_get_u32(tb[TCA_FQ_RATE_ENABLE]); |
| 748 | |
| 749 | if (enable <= 1) |
| 750 | q->rate_enable = enable; |
| 751 | else |
| 752 | err = -EINVAL; |
| 753 | } |
| 754 | |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 755 | if (tb[TCA_FQ_FLOW_REFILL_DELAY]) { |
| 756 | u32 usecs_delay = nla_get_u32(tb[TCA_FQ_FLOW_REFILL_DELAY]) ; |
| 757 | |
| 758 | q->flow_refill_delay = usecs_to_jiffies(usecs_delay); |
| 759 | } |
| 760 | |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 761 | if (tb[TCA_FQ_ORPHAN_MASK]) |
| 762 | q->orphan_mask = nla_get_u32(tb[TCA_FQ_ORPHAN_MASK]); |
| 763 | |
Eric Dumazet | 2d8d40a | 2014-03-06 22:57:52 -0800 | [diff] [blame] | 764 | if (!err) { |
| 765 | sch_tree_unlock(sch); |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 766 | err = fq_resize(sch, fq_log); |
Eric Dumazet | 2d8d40a | 2014-03-06 22:57:52 -0800 | [diff] [blame] | 767 | sch_tree_lock(sch); |
| 768 | } |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 769 | while (sch->q.qlen > sch->limit) { |
| 770 | struct sk_buff *skb = fq_dequeue(sch); |
| 771 | |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 772 | if (!skb) |
| 773 | break; |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 774 | drop_len += qdisc_pkt_len(skb); |
Eric Dumazet | e14ffdf | 2016-06-13 20:21:53 -0700 | [diff] [blame] | 775 | rtnl_kfree_skbs(skb, skb); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 776 | drop_count++; |
| 777 | } |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 778 | qdisc_tree_reduce_backlog(sch, drop_count, drop_len); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 779 | |
| 780 | sch_tree_unlock(sch); |
| 781 | return err; |
| 782 | } |
| 783 | |
| 784 | static void fq_destroy(struct Qdisc *sch) |
| 785 | { |
| 786 | struct fq_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 787 | |
Eric Dumazet | 8d34ce1 | 2013-09-27 14:20:01 -0700 | [diff] [blame] | 788 | fq_reset(sch); |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 789 | fq_free(q->fq_root); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 790 | qdisc_watchdog_cancel(&q->watchdog); |
| 791 | } |
| 792 | |
| 793 | static int fq_init(struct Qdisc *sch, struct nlattr *opt) |
| 794 | { |
| 795 | struct fq_sched_data *q = qdisc_priv(sch); |
| 796 | int err; |
| 797 | |
| 798 | sch->limit = 10000; |
| 799 | q->flow_plimit = 100; |
| 800 | q->quantum = 2 * psched_mtu(qdisc_dev(sch)); |
| 801 | q->initial_quantum = 10 * psched_mtu(qdisc_dev(sch)); |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 802 | q->flow_refill_delay = msecs_to_jiffies(40); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 803 | q->flow_max_rate = ~0U; |
Eric Dumazet | fefa569 | 2016-09-22 08:58:55 -0700 | [diff] [blame] | 804 | q->time_next_delayed_flow = ~0ULL; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 805 | q->rate_enable = 1; |
| 806 | q->new_flows.first = NULL; |
| 807 | q->old_flows.first = NULL; |
| 808 | q->delayed = RB_ROOT; |
| 809 | q->fq_root = NULL; |
| 810 | q->fq_trees_log = ilog2(1024); |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 811 | q->orphan_mask = 1024 - 1; |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 812 | q->low_rate_threshold = 550000 / 8; |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 813 | qdisc_watchdog_init(&q->watchdog, sch); |
| 814 | |
| 815 | if (opt) |
| 816 | err = fq_change(sch, opt); |
| 817 | else |
Eric Dumazet | c3bd854 | 2013-12-15 13:15:25 -0800 | [diff] [blame] | 818 | err = fq_resize(sch, q->fq_trees_log); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 819 | |
| 820 | return err; |
| 821 | } |
| 822 | |
| 823 | static int fq_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 824 | { |
| 825 | struct fq_sched_data *q = qdisc_priv(sch); |
| 826 | struct nlattr *opts; |
| 827 | |
| 828 | opts = nla_nest_start(skb, TCA_OPTIONS); |
| 829 | if (opts == NULL) |
| 830 | goto nla_put_failure; |
| 831 | |
Eric Dumazet | 65c5189 | 2013-11-15 08:57:26 -0800 | [diff] [blame] | 832 | /* TCA_FQ_FLOW_DEFAULT_RATE is not used anymore */ |
| 833 | |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 834 | if (nla_put_u32(skb, TCA_FQ_PLIMIT, sch->limit) || |
| 835 | nla_put_u32(skb, TCA_FQ_FLOW_PLIMIT, q->flow_plimit) || |
| 836 | nla_put_u32(skb, TCA_FQ_QUANTUM, q->quantum) || |
| 837 | nla_put_u32(skb, TCA_FQ_INITIAL_QUANTUM, q->initial_quantum) || |
| 838 | nla_put_u32(skb, TCA_FQ_RATE_ENABLE, q->rate_enable) || |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 839 | nla_put_u32(skb, TCA_FQ_FLOW_MAX_RATE, q->flow_max_rate) || |
Eric Dumazet | f52ed89 | 2013-11-15 08:58:14 -0800 | [diff] [blame] | 840 | nla_put_u32(skb, TCA_FQ_FLOW_REFILL_DELAY, |
| 841 | jiffies_to_usecs(q->flow_refill_delay)) || |
Eric Dumazet | 06eb395 | 2015-02-04 21:30:40 -0800 | [diff] [blame] | 842 | nla_put_u32(skb, TCA_FQ_ORPHAN_MASK, q->orphan_mask) || |
Eric Dumazet | 7787914 | 2016-09-19 23:39:11 -0400 | [diff] [blame] | 843 | nla_put_u32(skb, TCA_FQ_LOW_RATE_THRESHOLD, |
| 844 | q->low_rate_threshold) || |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 845 | nla_put_u32(skb, TCA_FQ_BUCKETS_LOG, q->fq_trees_log)) |
| 846 | goto nla_put_failure; |
| 847 | |
Yang Yingliang | d59b7d8 | 2014-03-12 10:20:32 +0800 | [diff] [blame] | 848 | return nla_nest_end(skb, opts); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 849 | |
| 850 | nla_put_failure: |
| 851 | return -1; |
| 852 | } |
| 853 | |
| 854 | static int fq_dump_stats(struct Qdisc *sch, struct gnet_dump *d) |
| 855 | { |
| 856 | struct fq_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | 695b4ec | 2016-09-15 16:20:01 -0700 | [diff] [blame] | 857 | struct tc_fq_qd_stats st; |
| 858 | |
| 859 | sch_tree_lock(sch); |
| 860 | |
| 861 | st.gc_flows = q->stat_gc_flows; |
| 862 | st.highprio_packets = q->stat_internal_packets; |
| 863 | st.tcp_retrans = q->stat_tcp_retrans; |
| 864 | st.throttled = q->stat_throttled; |
| 865 | st.flows_plimit = q->stat_flows_plimit; |
| 866 | st.pkts_too_long = q->stat_pkts_too_long; |
| 867 | st.allocation_errors = q->stat_allocation_errors; |
| 868 | st.time_next_delayed_flow = q->time_next_delayed_flow - ktime_get_ns(); |
| 869 | st.flows = q->flows; |
| 870 | st.inactive_flows = q->inactive_flows; |
| 871 | st.throttled_flows = q->throttled_flows; |
Eric Dumazet | fefa569 | 2016-09-22 08:58:55 -0700 | [diff] [blame] | 872 | st.unthrottle_latency_ns = min_t(unsigned long, |
| 873 | q->unthrottle_latency_ns, ~0U); |
Eric Dumazet | 695b4ec | 2016-09-15 16:20:01 -0700 | [diff] [blame] | 874 | sch_tree_unlock(sch); |
Eric Dumazet | afe4fd0 | 2013-08-29 15:49:55 -0700 | [diff] [blame] | 875 | |
| 876 | return gnet_stats_copy_app(d, &st, sizeof(st)); |
| 877 | } |
| 878 | |
| 879 | static struct Qdisc_ops fq_qdisc_ops __read_mostly = { |
| 880 | .id = "fq", |
| 881 | .priv_size = sizeof(struct fq_sched_data), |
| 882 | |
| 883 | .enqueue = fq_enqueue, |
| 884 | .dequeue = fq_dequeue, |
| 885 | .peek = qdisc_peek_dequeued, |
| 886 | .init = fq_init, |
| 887 | .reset = fq_reset, |
| 888 | .destroy = fq_destroy, |
| 889 | .change = fq_change, |
| 890 | .dump = fq_dump, |
| 891 | .dump_stats = fq_dump_stats, |
| 892 | .owner = THIS_MODULE, |
| 893 | }; |
| 894 | |
| 895 | static int __init fq_module_init(void) |
| 896 | { |
| 897 | int ret; |
| 898 | |
| 899 | fq_flow_cachep = kmem_cache_create("fq_flow_cache", |
| 900 | sizeof(struct fq_flow), |
| 901 | 0, 0, NULL); |
| 902 | if (!fq_flow_cachep) |
| 903 | return -ENOMEM; |
| 904 | |
| 905 | ret = register_qdisc(&fq_qdisc_ops); |
| 906 | if (ret) |
| 907 | kmem_cache_destroy(fq_flow_cachep); |
| 908 | return ret; |
| 909 | } |
| 910 | |
| 911 | static void __exit fq_module_exit(void) |
| 912 | { |
| 913 | unregister_qdisc(&fq_qdisc_ops); |
| 914 | kmem_cache_destroy(fq_flow_cachep); |
| 915 | } |
| 916 | |
| 917 | module_init(fq_module_init) |
| 918 | module_exit(fq_module_exit) |
| 919 | MODULE_AUTHOR("Eric Dumazet"); |
| 920 | MODULE_LICENSE("GPL"); |