1 /*
2 * FQ_PIE - The FlowQueue-PIE scheduler/AQM
3 *
4 * $FreeBSD$
5 *
6 * Copyright (C) 2016 Centre for Advanced Internet Architectures,
7 * Swinburne University of Technology, Melbourne, Australia.
8 * Portions of this code were made possible in part by a gift from
9 * The Comcast Innovation Fund.
10 * Implemented by Rasool Al-Saadi <ralsaadi@swin.edu.au>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /* Important note:
35 * As there is no an office document for FQ-PIE specification, we used
36 * FQ-CoDel algorithm with some modifications to implement FQ-PIE.
37 * This FQ-PIE implementation is a beta version and have not been tested
38 * extensively. Our FQ-PIE uses stand-alone PIE AQM per sub-queue. By
39 * default, timestamp is used to calculate queue delay instead of departure
40 * rate estimation method. Although departure rate estimation is available
41 * as testing option, the results could be incorrect. Moreover, turning PIE on
42 * and off option is available but it does not work properly in this version.
43 */
44
45 #ifdef _KERNEL
46 #include <sys/malloc.h>
47 #include <sys/socket.h>
48 #include <sys/kernel.h>
49 #include <sys/mbuf.h>
50 #include <sys/lock.h>
51 #include <sys/module.h>
52 #include <sys/mutex.h>
53 #include <net/if.h> /* IFNAMSIZ */
54 #include <netinet/in.h>
55 #include <netinet/ip_var.h> /* ipfw_rule_ref */
56 #include <netinet/ip_fw.h> /* flow_id */
57 #include <netinet/ip_dummynet.h>
58
59 #include <sys/proc.h>
60 #include <sys/rwlock.h>
61
62 #include <netpfil/ipfw/ip_fw_private.h>
63 #include <sys/sysctl.h>
64 #include <netinet/ip.h>
65 #include <netinet/ip6.h>
66 #include <netinet/ip_icmp.h>
67 #include <netinet/tcp.h>
68 #include <netinet/udp.h>
69 #include <sys/queue.h>
70 #include <sys/hash.h>
71
72 #include <netpfil/ipfw/dn_heap.h>
73 #include <netpfil/ipfw/ip_dn_private.h>
74
75 #include <netpfil/ipfw/dn_aqm.h>
76 #include <netpfil/ipfw/dn_aqm_pie.h>
77 #include <netpfil/ipfw/dn_sched.h>
78
79 #else
80 #include <dn_test.h>
81 #endif
82
83 #define DN_SCHED_FQ_PIE 7
84
85 /* list of queues */
86 STAILQ_HEAD(fq_pie_list, fq_pie_flow);
87
88 /* FQ_PIE parameters including PIE */
89 struct dn_sch_fq_pie_parms {
90 struct dn_aqm_pie_parms pcfg; /* PIE configuration Parameters */
91 /* FQ_PIE Parameters */
92 uint32_t flows_cnt; /* number of flows */
93 uint32_t limit; /* hard limit of FQ_PIE queue size*/
94 uint32_t quantum;
95 };
96
97 /* flow (sub-queue) stats */
98 struct flow_stats {
99 uint64_t tot_pkts; /* statistics counters */
100 uint64_t tot_bytes;
101 uint32_t length; /* Queue length, in packets */
102 uint32_t len_bytes; /* Queue length, in bytes */
103 uint32_t drops;
104 };
105
106 /* A flow of packets (sub-queue)*/
107 struct fq_pie_flow {
108 struct mq mq; /* list of packets */
109 struct flow_stats stats; /* statistics */
110 int deficit;
111 int active; /* 1: flow is active (in a list) */
112 struct pie_status pst; /* pie status variables */
113 struct fq_pie_si_extra *psi_extra;
114 STAILQ_ENTRY(fq_pie_flow) flowchain;
115 };
116
117 /* extra fq_pie scheduler configurations */
118 struct fq_pie_schk {
119 struct dn_sch_fq_pie_parms cfg;
120 };
121
122 /* fq_pie scheduler instance extra state vars.
123 * The purpose of separation this structure is to preserve number of active
124 * sub-queues and the flows array pointer even after the scheduler instance
125 * is destroyed.
126 * Preserving these varaiables allows freeing the allocated memory by
127 * fqpie_callout_cleanup() independently from fq_pie_free_sched().
128 */
129 struct fq_pie_si_extra {
130 uint32_t nr_active_q; /* number of active queues */
131 struct fq_pie_flow *flows; /* array of flows (queues) */
132 };
133
134 /* fq_pie scheduler instance */
135 struct fq_pie_si {
136 struct dn_sch_inst _si; /* standard scheduler instance. SHOULD BE FIRST */
137 struct dn_queue main_q; /* main queue is after si directly */
138 uint32_t perturbation; /* random value */
139 struct fq_pie_list newflows; /* list of new queues */
140 struct fq_pie_list oldflows; /* list of old queues */
141 struct fq_pie_si_extra *si_extra; /* extra state vars*/
142 };
143
144 static struct dn_alg fq_pie_desc;
145
146 /* Default FQ-PIE parameters including PIE */
147 /* PIE defaults
148 * target=15ms, max_burst=150ms, max_ecnth=0.1,
149 * alpha=0.125, beta=1.25, tupdate=15ms
150 * FQ-
151 * flows=1024, limit=10240, quantum =1514
152 */
153 struct dn_sch_fq_pie_parms
154 fq_pie_sysctl = {{15000 * AQM_TIME_1US, 15000 * AQM_TIME_1US,
155 150000 * AQM_TIME_1US, PIE_SCALE * 0.1, PIE_SCALE * 0.125,
156 PIE_SCALE * 1.25, PIE_CAPDROP_ENABLED | PIE_DERAND_ENABLED},
157 1024, 10240, 1514};
158
159 static int
160 fqpie_sysctl_alpha_beta_handler(SYSCTL_HANDLER_ARGS)
161 {
162 int error;
163 long value;
164
165 if (!strcmp(oidp->oid_name,"alpha"))
166 value = fq_pie_sysctl.pcfg.alpha;
167 else
168 value = fq_pie_sysctl.pcfg.beta;
169
170 value = value * 1000 / PIE_SCALE;
171 error = sysctl_handle_long(oidp, &value, 0, req);
172 if (error != 0 || req->newptr == NULL)
173 return (error);
174 if (value < 1 || value > 7 * PIE_SCALE)
175 return (EINVAL);
176 value = (value * PIE_SCALE) / 1000;
177 if (!strcmp(oidp->oid_name,"alpha"))
178 fq_pie_sysctl.pcfg.alpha = value;
179 else
180 fq_pie_sysctl.pcfg.beta = value;
181 return (0);
182 }
183
184 static int
185 fqpie_sysctl_target_tupdate_maxb_handler(SYSCTL_HANDLER_ARGS)
186 {
187 int error;
188 long value;
189
190 if (!strcmp(oidp->oid_name,"target"))
191 value = fq_pie_sysctl.pcfg.qdelay_ref;
192 else if (!strcmp(oidp->oid_name,"tupdate"))
193 value = fq_pie_sysctl.pcfg.tupdate;
194 else
195 value = fq_pie_sysctl.pcfg.max_burst;
196
197 value = value / AQM_TIME_1US;
198 error = sysctl_handle_long(oidp, &value, 0, req);
199 if (error != 0 || req->newptr == NULL)
200 return (error);
201 if (value < 1 || value > 10 * AQM_TIME_1S)
202 return (EINVAL);
203 value = value * AQM_TIME_1US;
204
205 if (!strcmp(oidp->oid_name,"target"))
206 fq_pie_sysctl.pcfg.qdelay_ref = value;
207 else if (!strcmp(oidp->oid_name,"tupdate"))
208 fq_pie_sysctl.pcfg.tupdate = value;
209 else
210 fq_pie_sysctl.pcfg.max_burst = value;
211 return (0);
212 }
213
214 static int
215 fqpie_sysctl_max_ecnth_handler(SYSCTL_HANDLER_ARGS)
216 {
217 int error;
218 long value;
219
220 value = fq_pie_sysctl.pcfg.max_ecnth;
221 value = value * 1000 / PIE_SCALE;
222 error = sysctl_handle_long(oidp, &value, 0, req);
223 if (error != 0 || req->newptr == NULL)
224 return (error);
225 if (value < 1 || value > PIE_SCALE)
226 return (EINVAL);
227 value = (value * PIE_SCALE) / 1000;
228 fq_pie_sysctl.pcfg.max_ecnth = value;
229 return (0);
230 }
231
232 /* define FQ- PIE sysctl variables */
233 SYSBEGIN(f4)
234 SYSCTL_DECL(_net_inet);
235 SYSCTL_DECL(_net_inet_ip);
236 SYSCTL_DECL(_net_inet_ip_dummynet);
237 static SYSCTL_NODE(_net_inet_ip_dummynet, OID_AUTO, fqpie,
238 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
239 "FQ_PIE");
240
241 #ifdef SYSCTL_NODE
242
243 SYSCTL_PROC(_net_inet_ip_dummynet_fqpie, OID_AUTO, target,
244 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
245 fqpie_sysctl_target_tupdate_maxb_handler, "L",
246 "queue target in microsecond");
247
248 SYSCTL_PROC(_net_inet_ip_dummynet_fqpie, OID_AUTO, tupdate,
249 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
250 fqpie_sysctl_target_tupdate_maxb_handler, "L",
251 "the frequency of drop probability calculation in microsecond");
252
253 SYSCTL_PROC(_net_inet_ip_dummynet_fqpie, OID_AUTO, max_burst,
254 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
255 fqpie_sysctl_target_tupdate_maxb_handler, "L",
256 "Burst allowance interval in microsecond");
257
258 SYSCTL_PROC(_net_inet_ip_dummynet_fqpie, OID_AUTO, max_ecnth,
259 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
260 fqpie_sysctl_max_ecnth_handler, "L",
261 "ECN safeguard threshold scaled by 1000");
262
263 SYSCTL_PROC(_net_inet_ip_dummynet_fqpie, OID_AUTO, alpha,
264 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
265 fqpie_sysctl_alpha_beta_handler, "L",
266 "PIE alpha scaled by 1000");
267
268 SYSCTL_PROC(_net_inet_ip_dummynet_fqpie, OID_AUTO, beta,
269 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
270 fqpie_sysctl_alpha_beta_handler, "L",
271 "beta scaled by 1000");
272
273 SYSCTL_UINT(_net_inet_ip_dummynet_fqpie, OID_AUTO, quantum,
274 CTLFLAG_RW, &fq_pie_sysctl.quantum, 1514, "quantum for FQ_PIE");
275 SYSCTL_UINT(_net_inet_ip_dummynet_fqpie, OID_AUTO, flows,
276 CTLFLAG_RW, &fq_pie_sysctl.flows_cnt, 1024, "Number of queues for FQ_PIE");
277 SYSCTL_UINT(_net_inet_ip_dummynet_fqpie, OID_AUTO, limit,
278 CTLFLAG_RW, &fq_pie_sysctl.limit, 10240, "limit for FQ_PIE");
279 #endif
280
281 /* Helper function to update queue&main-queue and scheduler statistics.
282 * negative len & drop -> drop
283 * negative len -> dequeue
284 * positive len -> enqueue
285 * positive len + drop -> drop during enqueue
286 */
287 __inline static void
288 fq_update_stats(struct fq_pie_flow *q, struct fq_pie_si *si, int len,
289 int drop)
290 {
291 int inc = 0;
292
293 if (len < 0)
294 inc = -1;
295 else if (len > 0)
296 inc = 1;
297
298 if (drop) {
299 si->main_q.ni.drops ++;
300 q->stats.drops ++;
301 si->_si.ni.drops ++;
302 V_dn_cfg.io_pkt_drop ++;
303 }
304
305 if (!drop || (drop && len < 0)) {
306 /* Update stats for the main queue */
307 si->main_q.ni.length += inc;
308 si->main_q.ni.len_bytes += len;
309
310 /*update sub-queue stats */
311 q->stats.length += inc;
312 q->stats.len_bytes += len;
313
314 /*update scheduler instance stats */
315 si->_si.ni.length += inc;
316 si->_si.ni.len_bytes += len;
317 }
318
319 if (inc > 0) {
320 si->main_q.ni.tot_bytes += len;
321 si->main_q.ni.tot_pkts ++;
322
323 q->stats.tot_bytes +=len;
324 q->stats.tot_pkts++;
325
326 si->_si.ni.tot_bytes +=len;
327 si->_si.ni.tot_pkts ++;
328 }
329
330 }
331
332 /*
333 * Extract a packet from the head of sub-queue 'q'
334 * Return a packet or NULL if the queue is empty.
335 * If getts is set, also extract packet's timestamp from mtag.
336 */
337 __inline static struct mbuf *
338 fq_pie_extract_head(struct fq_pie_flow *q, aqm_time_t *pkt_ts,
339 struct fq_pie_si *si, int getts)
340 {
341 struct mbuf *m;
342
343 next: m = q->mq.head;
344 if (m == NULL)
345 return m;
346 q->mq.head = m->m_nextpkt;
347
348 fq_update_stats(q, si, -m->m_pkthdr.len, 0);
349
350 if (si->main_q.ni.length == 0) /* queue is now idle */
351 si->main_q.q_time = V_dn_cfg.curr_time;
352
353 if (getts) {
354 /* extract packet timestamp*/
355 struct m_tag *mtag;
356 mtag = m_tag_locate(m, MTAG_ABI_COMPAT, DN_AQM_MTAG_TS, NULL);
357 if (mtag == NULL){
358 D("PIE timestamp mtag not found!");
359 *pkt_ts = 0;
360 } else {
361 *pkt_ts = *(aqm_time_t *)(mtag + 1);
362 m_tag_delete(m,mtag);
363 }
364 }
365 if (m->m_pkthdr.rcvif != NULL &&
366 __predict_false(m_rcvif_restore(m) == NULL)) {
367 m_freem(m);
368 goto next;
369 }
370 return m;
371 }
372
373 /*
374 * Callout function for drop probability calculation
375 * This function is called over tupdate ms and takes pointer of FQ-PIE
376 * flow as an argument
377 */
378 static void
379 fq_calculate_drop_prob(void *x)
380 {
381 struct fq_pie_flow *q = (struct fq_pie_flow *) x;
382 struct pie_status *pst = &q->pst;
383 struct dn_aqm_pie_parms *pprms;
384 int64_t p, prob, oldprob;
385 int p_isneg;
386
387 pprms = pst->parms;
388 prob = pst->drop_prob;
389
390 /* calculate current qdelay using DRE method.
391 * If TS is used and no data in the queue, reset current_qdelay
392 * as it stays at last value during dequeue process.
393 */
394 if (pprms->flags & PIE_DEPRATEEST_ENABLED)
395 pst->current_qdelay = ((uint64_t)q->stats.len_bytes * pst->avg_dq_time)
396 >> PIE_DQ_THRESHOLD_BITS;
397 else
398 if (!q->stats.len_bytes)
399 pst->current_qdelay = 0;
400
401 /* calculate drop probability */
402 p = (int64_t)pprms->alpha *
403 ((int64_t)pst->current_qdelay - (int64_t)pprms->qdelay_ref);
404 p +=(int64_t) pprms->beta *
405 ((int64_t)pst->current_qdelay - (int64_t)pst->qdelay_old);
406
407 /* take absolute value so right shift result is well defined */
408 p_isneg = p < 0;
409 if (p_isneg) {
410 p = -p;
411 }
412
413 /* We PIE_MAX_PROB shift by 12-bits to increase the division precision */
414 p *= (PIE_MAX_PROB << 12) / AQM_TIME_1S;
415
416 /* auto-tune drop probability */
417 if (prob < (PIE_MAX_PROB / 1000000)) /* 0.000001 */
418 p >>= 11 + PIE_FIX_POINT_BITS + 12;
419 else if (prob < (PIE_MAX_PROB / 100000)) /* 0.00001 */
420 p >>= 9 + PIE_FIX_POINT_BITS + 12;
421 else if (prob < (PIE_MAX_PROB / 10000)) /* 0.0001 */
422 p >>= 7 + PIE_FIX_POINT_BITS + 12;
423 else if (prob < (PIE_MAX_PROB / 1000)) /* 0.001 */
424 p >>= 5 + PIE_FIX_POINT_BITS + 12;
425 else if (prob < (PIE_MAX_PROB / 100)) /* 0.01 */
426 p >>= 3 + PIE_FIX_POINT_BITS + 12;
427 else if (prob < (PIE_MAX_PROB / 10)) /* 0.1 */
428 p >>= 1 + PIE_FIX_POINT_BITS + 12;
429 else
430 p >>= PIE_FIX_POINT_BITS + 12;
431
432 oldprob = prob;
433
434 if (p_isneg) {
435 prob = prob - p;
436
437 /* check for multiplication underflow */
438 if (prob > oldprob) {
439 prob= 0;
440 D("underflow");
441 }
442 } else {
443 /* Cap Drop adjustment */
444 if ((pprms->flags & PIE_CAPDROP_ENABLED) &&
445 prob >= PIE_MAX_PROB / 10 &&
446 p > PIE_MAX_PROB / 50 ) {
447 p = PIE_MAX_PROB / 50;
448 }
449
450 prob = prob + p;
451
452 /* check for multiplication overflow */
453 if (prob<oldprob) {
454 D("overflow");
455 prob= PIE_MAX_PROB;
456 }
457 }
458
459 /*
460 * decay the drop probability exponentially
461 * and restrict it to range 0 to PIE_MAX_PROB
462 */
463 if (prob < 0) {
464 prob = 0;
465 } else {
466 if (pst->current_qdelay == 0 && pst->qdelay_old == 0) {
467 /* 0.98 ~= 1- 1/64 */
468 prob = prob - (prob >> 6);
469 }
470
471 if (prob > PIE_MAX_PROB) {
472 prob = PIE_MAX_PROB;
473 }
474 }
475
476 pst->drop_prob = prob;
477
478 /* store current delay value */
479 pst->qdelay_old = pst->current_qdelay;
480
481 /* update burst allowance */
482 if ((pst->sflags & PIE_ACTIVE) && pst->burst_allowance) {
483 if (pst->burst_allowance > pprms->tupdate)
484 pst->burst_allowance -= pprms->tupdate;
485 else
486 pst->burst_allowance = 0;
487 }
488
489 if (pst->sflags & PIE_ACTIVE)
490 callout_reset_sbt(&pst->aqm_pie_callout,
491 (uint64_t)pprms->tupdate * SBT_1US,
492 0, fq_calculate_drop_prob, q, 0);
493
494 mtx_unlock(&pst->lock_mtx);
495 }
496
497 /*
498 * Reset PIE variables & activate the queue
499 */
500 __inline static void
501 fq_activate_pie(struct fq_pie_flow *q)
502 {
503 struct pie_status *pst = &q->pst;
504 struct dn_aqm_pie_parms *pprms;
505
506 mtx_lock(&pst->lock_mtx);
507 pprms = pst->parms;
508
509 pprms = pst->parms;
510 pst->drop_prob = 0;
511 pst->qdelay_old = 0;
512 pst->burst_allowance = pprms->max_burst;
513 pst->accu_prob = 0;
514 pst->dq_count = 0;
515 pst->avg_dq_time = 0;
516 pst->sflags = PIE_INMEASUREMENT | PIE_ACTIVE;
517 pst->measurement_start = AQM_UNOW;
518
519 callout_reset_sbt(&pst->aqm_pie_callout,
520 (uint64_t)pprms->tupdate * SBT_1US,
521 0, fq_calculate_drop_prob, q, 0);
522
523 mtx_unlock(&pst->lock_mtx);
524 }
525
526 /*
527 * Deactivate PIE and stop probe update callout
528 */
529 __inline static void
530 fq_deactivate_pie(struct pie_status *pst)
531 {
532 mtx_lock(&pst->lock_mtx);
533 pst->sflags &= ~(PIE_ACTIVE | PIE_INMEASUREMENT);
534 callout_stop(&pst->aqm_pie_callout);
535 //D("PIE Deactivated");
536 mtx_unlock(&pst->lock_mtx);
537 }
538
539 /*
540 * Initialize PIE for sub-queue 'q'
541 */
542 static int
543 pie_init(struct fq_pie_flow *q, struct fq_pie_schk *fqpie_schk)
544 {
545 struct pie_status *pst=&q->pst;
546 struct dn_aqm_pie_parms *pprms = pst->parms;
547
548 int err = 0;
549 if (!pprms){
550 D("AQM_PIE is not configured");
551 err = EINVAL;
552 } else {
553 q->psi_extra->nr_active_q++;
554
555 /* For speed optimization, we caculate 1/3 queue size once here */
556 // XXX limit divided by number of queues divided by 3 ???
557 pst->one_third_q_size = (fqpie_schk->cfg.limit /
558 fqpie_schk->cfg.flows_cnt) / 3;
559
560 mtx_init(&pst->lock_mtx, "mtx_pie", NULL, MTX_DEF);
561 callout_init_mtx(&pst->aqm_pie_callout, &pst->lock_mtx,
562 CALLOUT_RETURNUNLOCKED);
563 }
564
565 return err;
566 }
567
568 /*
569 * callout function to destroy PIE lock, and free fq_pie flows and fq_pie si
570 * extra memory when number of active sub-queues reaches zero.
571 * 'x' is a fq_pie_flow to be destroyed
572 */
573 static void
574 fqpie_callout_cleanup(void *x)
575 {
576 struct fq_pie_flow *q = x;
577 struct pie_status *pst = &q->pst;
578 struct fq_pie_si_extra *psi_extra;
579
580 mtx_unlock(&pst->lock_mtx);
581 mtx_destroy(&pst->lock_mtx);
582 psi_extra = q->psi_extra;
583
584 dummynet_sched_lock();
585 psi_extra->nr_active_q--;
586
587 /* when all sub-queues are destroyed, free flows fq_pie extra vars memory */
588 if (!psi_extra->nr_active_q) {
589 free(psi_extra->flows, M_DUMMYNET);
590 free(psi_extra, M_DUMMYNET);
591 fq_pie_desc.ref_count--;
592 }
593 dummynet_sched_unlock();
594 }
595
596 /*
597 * Clean up PIE status for sub-queue 'q'
598 * Stop callout timer and destroy mtx using fqpie_callout_cleanup() callout.
599 */
600 static int
601 pie_cleanup(struct fq_pie_flow *q)
602 {
603 struct pie_status *pst = &q->pst;
604
605 mtx_lock(&pst->lock_mtx);
606 callout_reset_sbt(&pst->aqm_pie_callout,
607 SBT_1US, 0, fqpie_callout_cleanup, q, 0);
608 mtx_unlock(&pst->lock_mtx);
609 return 0;
610 }
611
612 /*
613 * Dequeue and return a pcaket from sub-queue 'q' or NULL if 'q' is empty.
614 * Also, caculate depature time or queue delay using timestamp
615 */
616 static struct mbuf *
617 pie_dequeue(struct fq_pie_flow *q, struct fq_pie_si *si)
618 {
619 struct mbuf *m;
620 struct dn_aqm_pie_parms *pprms;
621 struct pie_status *pst;
622 aqm_time_t now;
623 aqm_time_t pkt_ts, dq_time;
624 int32_t w;
625
626 pst = &q->pst;
627 pprms = q->pst.parms;
628
629 /*we extarct packet ts only when Departure Rate Estimation dis not used*/
630 m = fq_pie_extract_head(q, &pkt_ts, si,
631 !(pprms->flags & PIE_DEPRATEEST_ENABLED));
632
633 if (!m || !(pst->sflags & PIE_ACTIVE))
634 return m;
635
636 now = AQM_UNOW;
637 if (pprms->flags & PIE_DEPRATEEST_ENABLED) {
638 /* calculate average depature time */
639 if(pst->sflags & PIE_INMEASUREMENT) {
640 pst->dq_count += m->m_pkthdr.len;
641
642 if (pst->dq_count >= PIE_DQ_THRESHOLD) {
643 dq_time = now - pst->measurement_start;
644
645 /*
646 * if we don't have old avg dq_time i.e PIE is (re)initialized,
647 * don't use weight to calculate new avg_dq_time
648 */
649 if(pst->avg_dq_time == 0)
650 pst->avg_dq_time = dq_time;
651 else {
652 /*
653 * weight = PIE_DQ_THRESHOLD/2^6, but we scaled
654 * weight by 2^8. Thus, scaled
655 * weight = PIE_DQ_THRESHOLD /2^8
656 * */
657 w = PIE_DQ_THRESHOLD >> 8;
658 pst->avg_dq_time = (dq_time* w
659 + (pst->avg_dq_time * ((1L << 8) - w))) >> 8;
660 pst->sflags &= ~PIE_INMEASUREMENT;
661 }
662 }
663 }
664
665 /*
666 * Start new measurement cycle when the queue has
667 * PIE_DQ_THRESHOLD worth of bytes.
668 */
669 if(!(pst->sflags & PIE_INMEASUREMENT) &&
670 q->stats.len_bytes >= PIE_DQ_THRESHOLD) {
671 pst->sflags |= PIE_INMEASUREMENT;
672 pst->measurement_start = now;
673 pst->dq_count = 0;
674 }
675 }
676 /* Optionally, use packet timestamp to estimate queue delay */
677 else
678 pst->current_qdelay = now - pkt_ts;
679
680 return m;
681 }
682
683 /*
684 * Enqueue a packet in q, subject to space and FQ-PIE queue management policy
685 * (whose parameters are in q->fs).
686 * Update stats for the queue and the scheduler.
687 * Return 0 on success, 1 on drop. The packet is consumed anyways.
688 */
689 static int
690 pie_enqueue(struct fq_pie_flow *q, struct mbuf* m, struct fq_pie_si *si)
691 {
692 uint64_t len;
693 struct pie_status *pst;
694 struct dn_aqm_pie_parms *pprms;
695 int t;
696
697 len = m->m_pkthdr.len;
698 pst = &q->pst;
699 pprms = pst->parms;
700 t = ENQUE;
701
702 /* drop/mark the packet when PIE is active and burst time elapsed */
703 if (pst->sflags & PIE_ACTIVE && pst->burst_allowance == 0
704 && drop_early(pst, q->stats.len_bytes) == DROP) {
705 /*
706 * if drop_prob over ECN threshold, drop the packet
707 * otherwise mark and enqueue it.
708 */
709 if (pprms->flags & PIE_ECN_ENABLED && pst->drop_prob <
710 (pprms->max_ecnth << (PIE_PROB_BITS - PIE_FIX_POINT_BITS))
711 && ecn_mark(m))
712 t = ENQUE;
713 else
714 t = DROP;
715 }
716
717 /* Turn PIE on when 1/3 of the queue is full */
718 if (!(pst->sflags & PIE_ACTIVE) && q->stats.len_bytes >=
719 pst->one_third_q_size) {
720 fq_activate_pie(q);
721 }
722
723 /* reset burst tolerance and optinally turn PIE off*/
724 if (pst->drop_prob == 0 && pst->current_qdelay < (pprms->qdelay_ref >> 1)
725 && pst->qdelay_old < (pprms->qdelay_ref >> 1)) {
726
727 pst->burst_allowance = pprms->max_burst;
728 if (pprms->flags & PIE_ON_OFF_MODE_ENABLED && q->stats.len_bytes<=0)
729 fq_deactivate_pie(pst);
730 }
731
732 /* Use timestamp if Departure Rate Estimation mode is disabled */
733 if (t != DROP && !(pprms->flags & PIE_DEPRATEEST_ENABLED)) {
734 /* Add TS to mbuf as a TAG */
735 struct m_tag *mtag;
736 mtag = m_tag_locate(m, MTAG_ABI_COMPAT, DN_AQM_MTAG_TS, NULL);
737 if (mtag == NULL)
738 mtag = m_tag_alloc(MTAG_ABI_COMPAT, DN_AQM_MTAG_TS,
739 sizeof(aqm_time_t), M_NOWAIT);
740 if (mtag == NULL) {
741 t = DROP;
742 } else {
743 *(aqm_time_t *)(mtag + 1) = AQM_UNOW;
744 m_tag_prepend(m, mtag);
745 }
746 }
747
748 if (t != DROP) {
749 mq_append(&q->mq, m);
750 fq_update_stats(q, si, len, 0);
751 return 0;
752 } else {
753 fq_update_stats(q, si, len, 1);
754 pst->accu_prob = 0;
755 FREE_PKT(m);
756 return 1;
757 }
758
759 return 0;
760 }
761
762 /* Drop a packet form the head of FQ-PIE sub-queue */
763 static void
764 pie_drop_head(struct fq_pie_flow *q, struct fq_pie_si *si)
765 {
766 struct mbuf *m = q->mq.head;
767
768 if (m == NULL)
769 return;
770 q->mq.head = m->m_nextpkt;
771
772 fq_update_stats(q, si, -m->m_pkthdr.len, 1);
773
774 if (si->main_q.ni.length == 0) /* queue is now idle */
775 si->main_q.q_time = V_dn_cfg.curr_time;
776 /* reset accu_prob after packet drop */
777 q->pst.accu_prob = 0;
778
779 FREE_PKT(m);
780 }
781
782 /*
783 * Classify a packet to queue number using Jenkins hash function.
784 * Return: queue number
785 * the input of the hash are protocol no, perturbation, src IP, dst IP,
786 * src port, dst port,
787 */
788 static inline int
789 fq_pie_classify_flow(struct mbuf *m, uint16_t fcount, struct fq_pie_si *si)
790 {
791 struct ip *ip;
792 struct tcphdr *th;
793 struct udphdr *uh;
794 uint8_t tuple[41];
795 uint16_t hash=0;
796
797 ip = (struct ip *)mtodo(m, dn_tag_get(m)->iphdr_off);
798 //#ifdef INET6
799 struct ip6_hdr *ip6;
800 int isip6;
801 isip6 = (ip->ip_v == 6);
802
803 if(isip6) {
804 ip6 = (struct ip6_hdr *)ip;
805 *((uint8_t *) &tuple[0]) = ip6->ip6_nxt;
806 *((uint32_t *) &tuple[1]) = si->perturbation;
807 memcpy(&tuple[5], ip6->ip6_src.s6_addr, 16);
808 memcpy(&tuple[21], ip6->ip6_dst.s6_addr, 16);
809
810 switch (ip6->ip6_nxt) {
811 case IPPROTO_TCP:
812 th = (struct tcphdr *)(ip6 + 1);
813 *((uint16_t *) &tuple[37]) = th->th_dport;
814 *((uint16_t *) &tuple[39]) = th->th_sport;
815 break;
816
817 case IPPROTO_UDP:
818 uh = (struct udphdr *)(ip6 + 1);
819 *((uint16_t *) &tuple[37]) = uh->uh_dport;
820 *((uint16_t *) &tuple[39]) = uh->uh_sport;
821 break;
822 default:
823 memset(&tuple[37], 0, 4);
824 }
825
826 hash = jenkins_hash(tuple, 41, HASHINIT) % fcount;
827 return hash;
828 }
829 //#endif
830
831 /* IPv4 */
832 *((uint8_t *) &tuple[0]) = ip->ip_p;
833 *((uint32_t *) &tuple[1]) = si->perturbation;
834 *((uint32_t *) &tuple[5]) = ip->ip_src.s_addr;
835 *((uint32_t *) &tuple[9]) = ip->ip_dst.s_addr;
836
837 switch (ip->ip_p) {
838 case IPPROTO_TCP:
839 th = (struct tcphdr *)(ip + 1);
840 *((uint16_t *) &tuple[13]) = th->th_dport;
841 *((uint16_t *) &tuple[15]) = th->th_sport;
842 break;
843
844 case IPPROTO_UDP:
845 uh = (struct udphdr *)(ip + 1);
846 *((uint16_t *) &tuple[13]) = uh->uh_dport;
847 *((uint16_t *) &tuple[15]) = uh->uh_sport;
848 break;
849 default:
850 memset(&tuple[13], 0, 4);
851 }
852 hash = jenkins_hash(tuple, 17, HASHINIT) % fcount;
853
854 return hash;
855 }
856
857 /*
858 * Enqueue a packet into an appropriate queue according to
859 * FQ-CoDe; algorithm.
860 */
861 static int
862 fq_pie_enqueue(struct dn_sch_inst *_si, struct dn_queue *_q,
863 struct mbuf *m)
864 {
865 struct fq_pie_si *si;
866 struct fq_pie_schk *schk;
867 struct dn_sch_fq_pie_parms *param;
868 struct dn_queue *mainq;
869 struct fq_pie_flow *flows;
870 int idx, drop, i, maxidx;
871
872 mainq = (struct dn_queue *)(_si + 1);
873 si = (struct fq_pie_si *)_si;
874 flows = si->si_extra->flows;
875 schk = (struct fq_pie_schk *)(si->_si.sched+1);
876 param = &schk->cfg;
877
878 /* classify a packet to queue number*/
879 idx = fq_pie_classify_flow(m, param->flows_cnt, si);
880
881 /* enqueue packet into appropriate queue using PIE AQM.
882 * Note: 'pie_enqueue' function returns 1 only when it unable to
883 * add timestamp to packet (no limit check)*/
884 drop = pie_enqueue(&flows[idx], m, si);
885
886 /* pie unable to timestamp a packet */
887 if (drop)
888 return 1;
889
890 /* If the flow (sub-queue) is not active ,then add it to tail of
891 * new flows list, initialize and activate it.
892 */
893 if (!flows[idx].active) {
894 STAILQ_INSERT_TAIL(&si->newflows, &flows[idx], flowchain);
895 flows[idx].deficit = param->quantum;
896 fq_activate_pie(&flows[idx]);
897 flows[idx].active = 1;
898 }
899
900 /* check the limit for all queues and remove a packet from the
901 * largest one
902 */
903 if (mainq->ni.length > schk->cfg.limit) {
904 /* find first active flow */
905 for (maxidx = 0; maxidx < schk->cfg.flows_cnt; maxidx++)
906 if (flows[maxidx].active)
907 break;
908 if (maxidx < schk->cfg.flows_cnt) {
909 /* find the largest sub- queue */
910 for (i = maxidx + 1; i < schk->cfg.flows_cnt; i++)
911 if (flows[i].active && flows[i].stats.length >
912 flows[maxidx].stats.length)
913 maxidx = i;
914 pie_drop_head(&flows[maxidx], si);
915 drop = 1;
916 }
917 }
918
919 return drop;
920 }
921
922 /*
923 * Dequeue a packet from an appropriate queue according to
924 * FQ-CoDel algorithm.
925 */
926 static struct mbuf *
927 fq_pie_dequeue(struct dn_sch_inst *_si)
928 {
929 struct fq_pie_si *si;
930 struct fq_pie_schk *schk;
931 struct dn_sch_fq_pie_parms *param;
932 struct fq_pie_flow *f;
933 struct mbuf *mbuf;
934 struct fq_pie_list *fq_pie_flowlist;
935
936 si = (struct fq_pie_si *)_si;
937 schk = (struct fq_pie_schk *)(si->_si.sched+1);
938 param = &schk->cfg;
939
940 do {
941 /* select a list to start with */
942 if (STAILQ_EMPTY(&si->newflows))
943 fq_pie_flowlist = &si->oldflows;
944 else
945 fq_pie_flowlist = &si->newflows;
946
947 /* Both new and old queue lists are empty, return NULL */
948 if (STAILQ_EMPTY(fq_pie_flowlist))
949 return NULL;
950
951 f = STAILQ_FIRST(fq_pie_flowlist);
952 while (f != NULL) {
953 /* if there is no flow(sub-queue) deficit, increase deficit
954 * by quantum, move the flow to the tail of old flows list
955 * and try another flow.
956 * Otherwise, the flow will be used for dequeue.
957 */
958 if (f->deficit < 0) {
959 f->deficit += param->quantum;
960 STAILQ_REMOVE_HEAD(fq_pie_flowlist, flowchain);
961 STAILQ_INSERT_TAIL(&si->oldflows, f, flowchain);
962 } else
963 break;
964
965 f = STAILQ_FIRST(fq_pie_flowlist);
966 }
967
968 /* the new flows list is empty, try old flows list */
969 if (STAILQ_EMPTY(fq_pie_flowlist))
970 continue;
971
972 /* Dequeue a packet from the selected flow */
973 mbuf = pie_dequeue(f, si);
974
975 /* pie did not return a packet */
976 if (!mbuf) {
977 /* If the selected flow belongs to new flows list, then move
978 * it to the tail of old flows list. Otherwise, deactivate it and
979 * remove it from the old list and
980 */
981 if (fq_pie_flowlist == &si->newflows) {
982 STAILQ_REMOVE_HEAD(fq_pie_flowlist, flowchain);
983 STAILQ_INSERT_TAIL(&si->oldflows, f, flowchain);
984 } else {
985 f->active = 0;
986 fq_deactivate_pie(&f->pst);
987 STAILQ_REMOVE_HEAD(fq_pie_flowlist, flowchain);
988 }
989 /* start again */
990 continue;
991 }
992
993 /* we have a packet to return,
994 * update flow deficit and return the packet*/
995 f->deficit -= mbuf->m_pkthdr.len;
996 return mbuf;
997
998 } while (1);
999
1000 /* unreachable point */
1001 return NULL;
1002 }
1003
1004 /*
1005 * Initialize fq_pie scheduler instance.
1006 * also, allocate memory for flows array.
1007 */
1008 static int
1009 fq_pie_new_sched(struct dn_sch_inst *_si)
1010 {
1011 struct fq_pie_si *si;
1012 struct dn_queue *q;
1013 struct fq_pie_schk *schk;
1014 struct fq_pie_flow *flows;
1015 int i;
1016
1017 si = (struct fq_pie_si *)_si;
1018 schk = (struct fq_pie_schk *)(_si->sched+1);
1019
1020 if(si->si_extra) {
1021 D("si already configured!");
1022 return 0;
1023 }
1024
1025 /* init the main queue */
1026 q = &si->main_q;
1027 set_oid(&q->ni.oid, DN_QUEUE, sizeof(*q));
1028 q->_si = _si;
1029 q->fs = _si->sched->fs;
1030
1031 /* allocate memory for scheduler instance extra vars */
1032 si->si_extra = malloc(sizeof(struct fq_pie_si_extra),
1033 M_DUMMYNET, M_NOWAIT | M_ZERO);
1034 if (si->si_extra == NULL) {
1035 D("cannot allocate memory for fq_pie si extra vars");
1036 return ENOMEM ;
1037 }
1038 /* allocate memory for flows array */
1039 si->si_extra->flows = mallocarray(schk->cfg.flows_cnt,
1040 sizeof(struct fq_pie_flow), M_DUMMYNET, M_NOWAIT | M_ZERO);
1041 flows = si->si_extra->flows;
1042 if (flows == NULL) {
1043 free(si->si_extra, M_DUMMYNET);
1044 si->si_extra = NULL;
1045 D("cannot allocate memory for fq_pie flows");
1046 return ENOMEM ;
1047 }
1048
1049 /* init perturbation for this si */
1050 si->perturbation = random();
1051 si->si_extra->nr_active_q = 0;
1052
1053 /* init the old and new flows lists */
1054 STAILQ_INIT(&si->newflows);
1055 STAILQ_INIT(&si->oldflows);
1056
1057 /* init the flows (sub-queues) */
1058 for (i = 0; i < schk->cfg.flows_cnt; i++) {
1059 flows[i].pst.parms = &schk->cfg.pcfg;
1060 flows[i].psi_extra = si->si_extra;
1061 pie_init(&flows[i], schk);
1062 }
1063
1064 dummynet_sched_lock();
1065 fq_pie_desc.ref_count++;
1066 dummynet_sched_unlock();
1067
1068 return 0;
1069 }
1070
1071 /*
1072 * Free fq_pie scheduler instance.
1073 */
1074 static int
1075 fq_pie_free_sched(struct dn_sch_inst *_si)
1076 {
1077 struct fq_pie_si *si;
1078 struct fq_pie_schk *schk;
1079 struct fq_pie_flow *flows;
1080 int i;
1081
1082 si = (struct fq_pie_si *)_si;
1083 schk = (struct fq_pie_schk *)(_si->sched+1);
1084 flows = si->si_extra->flows;
1085 for (i = 0; i < schk->cfg.flows_cnt; i++) {
1086 pie_cleanup(&flows[i]);
1087 }
1088 si->si_extra = NULL;
1089 return 0;
1090 }
1091
1092 /*
1093 * Configure FQ-PIE scheduler.
1094 * the configurations for the scheduler is passed fromipfw userland.
1095 */
1096 static int
1097 fq_pie_config(struct dn_schk *_schk)
1098 {
1099 struct fq_pie_schk *schk;
1100 struct dn_extra_parms *ep;
1101 struct dn_sch_fq_pie_parms *fqp_cfg;
1102
1103 schk = (struct fq_pie_schk *)(_schk+1);
1104 ep = (struct dn_extra_parms *) _schk->cfg;
1105
1106 /* par array contains fq_pie configuration as follow
1107 * PIE: 0- qdelay_ref,1- tupdate, 2- max_burst
1108 * 3- max_ecnth, 4- alpha, 5- beta, 6- flags
1109 * FQ_PIE: 7- quantum, 8- limit, 9- flows
1110 */
1111 if (ep && ep->oid.len ==sizeof(*ep) &&
1112 ep->oid.subtype == DN_SCH_PARAMS) {
1113 fqp_cfg = &schk->cfg;
1114 if (ep->par[0] < 0)
1115 fqp_cfg->pcfg.qdelay_ref = fq_pie_sysctl.pcfg.qdelay_ref;
1116 else
1117 fqp_cfg->pcfg.qdelay_ref = ep->par[0];
1118 if (ep->par[1] < 0)
1119 fqp_cfg->pcfg.tupdate = fq_pie_sysctl.pcfg.tupdate;
1120 else
1121 fqp_cfg->pcfg.tupdate = ep->par[1];
1122 if (ep->par[2] < 0)
1123 fqp_cfg->pcfg.max_burst = fq_pie_sysctl.pcfg.max_burst;
1124 else
1125 fqp_cfg->pcfg.max_burst = ep->par[2];
1126 if (ep->par[3] < 0)
1127 fqp_cfg->pcfg.max_ecnth = fq_pie_sysctl.pcfg.max_ecnth;
1128 else
1129 fqp_cfg->pcfg.max_ecnth = ep->par[3];
1130 if (ep->par[4] < 0)
1131 fqp_cfg->pcfg.alpha = fq_pie_sysctl.pcfg.alpha;
1132 else
1133 fqp_cfg->pcfg.alpha = ep->par[4];
1134 if (ep->par[5] < 0)
1135 fqp_cfg->pcfg.beta = fq_pie_sysctl.pcfg.beta;
1136 else
1137 fqp_cfg->pcfg.beta = ep->par[5];
1138 if (ep->par[6] < 0)
1139 fqp_cfg->pcfg.flags = 0;
1140 else
1141 fqp_cfg->pcfg.flags = ep->par[6];
1142
1143 /* FQ configurations */
1144 if (ep->par[7] < 0)
1145 fqp_cfg->quantum = fq_pie_sysctl.quantum;
1146 else
1147 fqp_cfg->quantum = ep->par[7];
1148 if (ep->par[8] < 0)
1149 fqp_cfg->limit = fq_pie_sysctl.limit;
1150 else
1151 fqp_cfg->limit = ep->par[8];
1152 if (ep->par[9] < 0)
1153 fqp_cfg->flows_cnt = fq_pie_sysctl.flows_cnt;
1154 else
1155 fqp_cfg->flows_cnt = ep->par[9];
1156
1157 /* Bound the configurations */
1158 fqp_cfg->pcfg.qdelay_ref = BOUND_VAR(fqp_cfg->pcfg.qdelay_ref,
1159 1, 5 * AQM_TIME_1S);
1160 fqp_cfg->pcfg.tupdate = BOUND_VAR(fqp_cfg->pcfg.tupdate,
1161 1, 5 * AQM_TIME_1S);
1162 fqp_cfg->pcfg.max_burst = BOUND_VAR(fqp_cfg->pcfg.max_burst,
1163 0, 5 * AQM_TIME_1S);
1164 fqp_cfg->pcfg.max_ecnth = BOUND_VAR(fqp_cfg->pcfg.max_ecnth,
1165 0, PIE_SCALE);
1166 fqp_cfg->pcfg.alpha = BOUND_VAR(fqp_cfg->pcfg.alpha, 0, 7 * PIE_SCALE);
1167 fqp_cfg->pcfg.beta = BOUND_VAR(fqp_cfg->pcfg.beta, 0, 7 * PIE_SCALE);
1168
1169 fqp_cfg->quantum = BOUND_VAR(fqp_cfg->quantum,1,9000);
1170 fqp_cfg->limit= BOUND_VAR(fqp_cfg->limit,1,20480);
1171 fqp_cfg->flows_cnt= BOUND_VAR(fqp_cfg->flows_cnt,1,65536);
1172 }
1173 else {
1174 D("Wrong parameters for fq_pie scheduler");
1175 return 1;
1176 }
1177
1178 return 0;
1179 }
1180
1181 /*
1182 * Return FQ-PIE scheduler configurations
1183 * the configurations for the scheduler is passed to userland.
1184 */
1185 static int
1186 fq_pie_getconfig (struct dn_schk *_schk, struct dn_extra_parms *ep) {
1187 struct fq_pie_schk *schk = (struct fq_pie_schk *)(_schk+1);
1188 struct dn_sch_fq_pie_parms *fqp_cfg;
1189
1190 fqp_cfg = &schk->cfg;
1191
1192 strcpy(ep->name, fq_pie_desc.name);
1193 ep->par[0] = fqp_cfg->pcfg.qdelay_ref;
1194 ep->par[1] = fqp_cfg->pcfg.tupdate;
1195 ep->par[2] = fqp_cfg->pcfg.max_burst;
1196 ep->par[3] = fqp_cfg->pcfg.max_ecnth;
1197 ep->par[4] = fqp_cfg->pcfg.alpha;
1198 ep->par[5] = fqp_cfg->pcfg.beta;
1199 ep->par[6] = fqp_cfg->pcfg.flags;
1200
1201 ep->par[7] = fqp_cfg->quantum;
1202 ep->par[8] = fqp_cfg->limit;
1203 ep->par[9] = fqp_cfg->flows_cnt;
1204
1205 return 0;
1206 }
1207
1208 /*
1209 * FQ-PIE scheduler descriptor
1210 * contains the type of the scheduler, the name, the size of extra
1211 * data structures, and function pointers.
1212 */
1213 static struct dn_alg fq_pie_desc = {
1214 _SI( .type = ) DN_SCHED_FQ_PIE,
1215 _SI( .name = ) "FQ_PIE",
1216 _SI( .flags = ) 0,
1217
1218 _SI( .schk_datalen = ) sizeof(struct fq_pie_schk),
1219 _SI( .si_datalen = ) sizeof(struct fq_pie_si) - sizeof(struct dn_sch_inst),
1220 _SI( .q_datalen = ) 0,
1221
1222 _SI( .enqueue = ) fq_pie_enqueue,
1223 _SI( .dequeue = ) fq_pie_dequeue,
1224 _SI( .config = ) fq_pie_config, /* new sched i.e. sched X config ...*/
1225 _SI( .destroy = ) NULL, /*sched x delete */
1226 _SI( .new_sched = ) fq_pie_new_sched, /* new schd instance */
1227 _SI( .free_sched = ) fq_pie_free_sched, /* delete schd instance */
1228 _SI( .new_fsk = ) NULL,
1229 _SI( .free_fsk = ) NULL,
1230 _SI( .new_queue = ) NULL,
1231 _SI( .free_queue = ) NULL,
1232 _SI( .getconfig = ) fq_pie_getconfig,
1233 _SI( .ref_count = ) 0
1234 };
1235
1236 DECLARE_DNSCHED_MODULE(dn_fq_pie, &fq_pie_desc);
Cache object: 2bb73b860be73d9d323d5a4a199e99be
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