2 * PIE - Proportional Integral controller Enhanced AQM algorithm.
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>
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/cdefs.h>
35 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
41 #include <sys/kernel.h>
43 #include <sys/module.h>
44 #include <sys/mutex.h>
47 #include <sys/rwlock.h>
48 #include <sys/socket.h>
50 #include <sys/sysctl.h>
52 #include <net/if.h> /* IFNAMSIZ, struct ifaddr, ifq head, lock.h mutex.h */
53 #include <net/netisr.h>
56 #include <netinet/in.h>
57 #include <netinet/ip.h> /* ip_len, ip_off */
58 #include <netinet/ip_var.h> /* ip_output(), IP_FORWARDING */
59 #include <netinet/ip_fw.h>
60 #include <netinet/ip_dummynet.h>
61 #include <netinet/if_ether.h> /* various ether_* routines */
62 #include <netinet/ip6.h> /* for ip6_input, ip6_output prototypes */
63 #include <netinet6/ip6_var.h>
64 #include <netpfil/ipfw/dn_heap.h>
67 #include <netpfil/ipfw/ip_fw_private.h>
68 #include <netpfil/ipfw/ip_dn_private.h>
69 #include <netpfil/ipfw/dn_aqm.h>
70 #include <netpfil/ipfw/dn_aqm_pie.h>
71 #include <netpfil/ipfw/dn_sched.h>
74 #include <sys/syslog.h>
76 static struct dn_aqm pie_desc;
79 * target=15ms, tupdate=15ms, max_burst=150ms,
80 * max_ecnth=0.1, alpha=0.125, beta=1.25,
82 struct dn_aqm_pie_parms pie_sysctl =
83 { 15 * AQM_TIME_1MS, 15 * AQM_TIME_1MS, 150 * AQM_TIME_1MS,
84 PIE_SCALE/10 , PIE_SCALE * 0.125, PIE_SCALE * 1.25 ,
85 PIE_CAPDROP_ENABLED | PIE_DEPRATEEST_ENABLED | PIE_DERAND_ENABLED };
88 pie_sysctl_alpha_beta_handler(SYSCTL_HANDLER_ARGS)
93 if (!strcmp(oidp->oid_name,"alpha"))
94 value = pie_sysctl.alpha;
96 value = pie_sysctl.beta;
98 value = value * 1000 / PIE_SCALE;
99 error = sysctl_handle_long(oidp, &value, 0, req);
100 if (error != 0 || req->newptr == NULL)
102 if (value < 1 || value > 7 * PIE_SCALE)
104 value = (value * PIE_SCALE) / 1000;
105 if (!strcmp(oidp->oid_name,"alpha"))
106 pie_sysctl.alpha = value;
108 pie_sysctl.beta = value;
113 pie_sysctl_target_tupdate_maxb_handler(SYSCTL_HANDLER_ARGS)
118 if (!strcmp(oidp->oid_name,"target"))
119 value = pie_sysctl.qdelay_ref;
120 else if (!strcmp(oidp->oid_name,"tupdate"))
121 value = pie_sysctl.tupdate;
123 value = pie_sysctl.max_burst;
125 value = value / AQM_TIME_1US;
126 error = sysctl_handle_long(oidp, &value, 0, req);
127 if (error != 0 || req->newptr == NULL)
129 if (value < 1 || value > 10 * AQM_TIME_1S)
131 value = value * AQM_TIME_1US;
133 if (!strcmp(oidp->oid_name,"target"))
134 pie_sysctl.qdelay_ref = value;
135 else if (!strcmp(oidp->oid_name,"tupdate"))
136 pie_sysctl.tupdate = value;
138 pie_sysctl.max_burst = value;
143 pie_sysctl_max_ecnth_handler(SYSCTL_HANDLER_ARGS)
148 value = pie_sysctl.max_ecnth;
149 value = value * 1000 / PIE_SCALE;
150 error = sysctl_handle_long(oidp, &value, 0, req);
151 if (error != 0 || req->newptr == NULL)
153 if (value < 1 || value > PIE_SCALE)
155 value = (value * PIE_SCALE) / 1000;
156 pie_sysctl.max_ecnth = value;
160 /* define PIE sysctl variables */
162 SYSCTL_DECL(_net_inet);
163 SYSCTL_DECL(_net_inet_ip);
164 SYSCTL_DECL(_net_inet_ip_dummynet);
165 static SYSCTL_NODE(_net_inet_ip_dummynet, OID_AUTO,
166 pie, CTLFLAG_RW, 0, "PIE");
169 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, target,
170 CTLTYPE_LONG | CTLFLAG_RW, NULL, 0,
171 pie_sysctl_target_tupdate_maxb_handler, "L",
172 "queue target in microsecond");
173 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, tupdate,
174 CTLTYPE_LONG | CTLFLAG_RW, NULL, 0,
175 pie_sysctl_target_tupdate_maxb_handler, "L",
176 "the frequency of drop probability calculation in microsecond");
177 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, max_burst,
178 CTLTYPE_LONG | CTLFLAG_RW, NULL, 0,
179 pie_sysctl_target_tupdate_maxb_handler, "L",
180 "Burst allowance interval in microsecond");
182 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, max_ecnth,
183 CTLTYPE_LONG | CTLFLAG_RW, NULL, 0,
184 pie_sysctl_max_ecnth_handler, "L",
185 "ECN safeguard threshold scaled by 1000");
187 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, alpha,
188 CTLTYPE_LONG | CTLFLAG_RW, NULL, 0,
189 pie_sysctl_alpha_beta_handler, "L",
190 "PIE alpha scaled by 1000");
191 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, beta,
192 CTLTYPE_LONG | CTLFLAG_RW, NULL, 0,
193 pie_sysctl_alpha_beta_handler, "L",
194 "beta scaled by 1000");
199 * Callout function for drop probability calculation
200 * This function is called over tupdate ms and takes pointer of PIE
201 * status variables as an argument
204 calculate_drop_prob(void *x)
206 int64_t p, prob, oldprob;
207 struct dn_aqm_pie_parms *pprms;
208 struct pie_status *pst = (struct pie_status *) x;
211 prob = pst->drop_prob;
213 /* calculate current qdelay */
214 if (pprms->flags & PIE_DEPRATEEST_ENABLED) {
215 pst->current_qdelay = ((uint64_t)pst->pq->ni.len_bytes *
216 pst->avg_dq_time) >> PIE_DQ_THRESHOLD_BITS;
219 /* calculate drop probability */
220 p = (int64_t)pprms->alpha *
221 ((int64_t)pst->current_qdelay - (int64_t)pprms->qdelay_ref);
222 p +=(int64_t) pprms->beta *
223 ((int64_t)pst->current_qdelay - (int64_t)pst->qdelay_old);
225 /* We PIE_MAX_PROB shift by 12-bits to increase the division precision */
226 p *= (PIE_MAX_PROB << 12) / AQM_TIME_1S;
228 /* auto-tune drop probability */
229 if (prob < (PIE_MAX_PROB / 1000000)) /* 0.000001 */
230 p >>= 11 + PIE_FIX_POINT_BITS + 12;
231 else if (prob < (PIE_MAX_PROB / 100000)) /* 0.00001 */
232 p >>= 9 + PIE_FIX_POINT_BITS + 12;
233 else if (prob < (PIE_MAX_PROB / 10000)) /* 0.0001 */
234 p >>= 7 + PIE_FIX_POINT_BITS + 12;
235 else if (prob < (PIE_MAX_PROB / 1000)) /* 0.001 */
236 p >>= 5 + PIE_FIX_POINT_BITS + 12;
237 else if (prob < (PIE_MAX_PROB / 100)) /* 0.01 */
238 p >>= 3 + PIE_FIX_POINT_BITS + 12;
239 else if (prob < (PIE_MAX_PROB / 10)) /* 0.1 */
240 p >>= 1 + PIE_FIX_POINT_BITS + 12;
242 p >>= PIE_FIX_POINT_BITS + 12;
246 /* Cap Drop adjustment */
247 if ((pprms->flags & PIE_CAPDROP_ENABLED) && prob >= PIE_MAX_PROB / 10
248 && p > PIE_MAX_PROB / 50 )
249 p = PIE_MAX_PROB / 50;
253 /* decay the drop probability exponentially */
254 if (pst->current_qdelay == 0 && pst->qdelay_old == 0)
255 /* 0.98 ~= 1- 1/64 */
256 prob = prob - (prob >> 6);
259 /* check for multiplication overflow/underflow */
272 /* make drop probability between 0 and PIE_MAX_PROB*/
275 else if (prob > PIE_MAX_PROB)
278 pst->drop_prob = prob;
280 /* store current queue delay value in old queue delay*/
281 pst->qdelay_old = pst->current_qdelay;
283 /* update burst allowance */
284 if ((pst->sflags & PIE_ACTIVE) && pst->burst_allowance>0) {
286 if (pst->burst_allowance > pprms->tupdate )
287 pst->burst_allowance -= pprms->tupdate;
289 pst->burst_allowance = 0;
292 /* reschedule calculate_drop_prob function */
293 if (pst->sflags & PIE_ACTIVE)
294 callout_reset_sbt(&pst->aqm_pie_callout,
295 (uint64_t)pprms->tupdate * SBT_1US, 0, calculate_drop_prob, pst, 0);
297 mtx_unlock(&pst->lock_mtx);
301 * Extract a packet from the head of queue 'q'
302 * Return a packet or NULL if the queue is empty.
303 * If getts is set, also extract packet's timestamp from mtag.
306 pie_extract_head(struct dn_queue *q, aqm_time_t *pkt_ts, int getts)
309 struct mbuf *m = q->mq.head;
313 q->mq.head = m->m_nextpkt;
316 update_stats(q, -m->m_pkthdr.len, 0);
318 if (q->ni.length == 0) /* queue is now idle */
319 q->q_time = dn_cfg.curr_time;
322 /* extract packet TS*/
323 mtag = m_tag_locate(m, MTAG_ABI_COMPAT, DN_AQM_MTAG_TS, NULL);
325 D("PIE timestamp mtag not found!");
328 *pkt_ts = *(aqm_time_t *)(mtag + 1);
329 m_tag_delete(m,mtag);
336 * Initiate PIE variable and optionally activate it
339 init_activate_pie(struct pie_status *pst, int resettimer)
341 struct dn_aqm_pie_parms *pprms;
343 mtx_lock(&pst->lock_mtx);
347 pst->burst_allowance = pprms->max_burst;
350 pst->avg_dq_time = 0;
351 pst->sflags = PIE_INMEASUREMENT;
352 pst->measurement_start = AQM_UNOW;
355 pst->sflags |= PIE_ACTIVE;
356 callout_reset_sbt(&pst->aqm_pie_callout,
357 (uint64_t)pprms->tupdate * SBT_1US,
358 0, calculate_drop_prob, pst, 0);
360 //DX(2, "PIE Activated");
361 mtx_unlock(&pst->lock_mtx);
365 * Deactivate PIE and stop probe update callout
368 deactivate_pie(struct pie_status *pst)
370 mtx_lock(&pst->lock_mtx);
371 pst->sflags &= ~(PIE_ACTIVE | PIE_INMEASUREMENT);
372 callout_stop(&pst->aqm_pie_callout);
373 //D("PIE Deactivated");
374 mtx_unlock(&pst->lock_mtx);
378 * Dequeue and return a pcaket from queue 'q' or NULL if 'q' is empty.
379 * Also, caculate depature time or queue delay using timestamp
382 aqm_pie_dequeue(struct dn_queue *q)
385 struct dn_flow *ni; /* stats for scheduler instance */
386 struct dn_aqm_pie_parms *pprms;
387 struct pie_status *pst;
389 aqm_time_t pkt_ts, dq_time;
396 /*we extarct packet ts only when Departure Rate Estimation dis not used*/
397 m = pie_extract_head(q, &pkt_ts, !(pprms->flags & PIE_DEPRATEEST_ENABLED));
399 if (!m || !(pst->sflags & PIE_ACTIVE))
403 if (pprms->flags & PIE_DEPRATEEST_ENABLED) {
404 /* calculate average depature time */
405 if(pst->sflags & PIE_INMEASUREMENT) {
406 pst->dq_count += m->m_pkthdr.len;
408 if (pst->dq_count >= PIE_DQ_THRESHOLD) {
409 dq_time = now - pst->measurement_start;
412 * if we don't have old avg dq_time i.e PIE is (re)initialized,
413 * don't use weight to calculate new avg_dq_time
415 if(pst->avg_dq_time == 0)
416 pst->avg_dq_time = dq_time;
419 * weight = PIE_DQ_THRESHOLD/2^6, but we scaled
420 * weight by 2^8. Thus, scaled
421 * weight = PIE_DQ_THRESHOLD /2^8
423 w = PIE_DQ_THRESHOLD >> 8;
424 pst->avg_dq_time = (dq_time* w
425 + (pst->avg_dq_time * ((1L << 8) - w))) >> 8;
426 pst->sflags &= ~PIE_INMEASUREMENT;
432 * Start new measurment cycle when the queue has
433 * PIE_DQ_THRESHOLD worth of bytes.
435 if(!(pst->sflags & PIE_INMEASUREMENT) &&
436 q->ni.len_bytes >= PIE_DQ_THRESHOLD) {
437 pst->sflags |= PIE_INMEASUREMENT;
438 pst->measurement_start = now;
442 /* Optionally, use packet timestamp to estimate queue delay */
444 pst->current_qdelay = now - pkt_ts;
450 * Enqueue a packet in q, subject to space and PIE queue management policy
451 * (whose parameters are in q->fs).
452 * Update stats for the queue and the scheduler.
453 * Return 0 on success, 1 on drop. The packet is consumed anyways.
456 aqm_pie_enqueue(struct dn_queue *q, struct mbuf* m)
461 struct pie_status *pst;
462 struct dn_aqm_pie_parms *pprms;
465 len = m->m_pkthdr.len;
468 DX(2, "PIE queue is not initialized\n");
469 update_stats(q, 0, 1);
478 /* get current queue length in bytes or packets*/
479 qlen = (f->flags & DN_QSIZE_BYTES) ?
480 q->ni.len_bytes : q->ni.length;
482 /* check for queue size and drop the tail if exceed queue limit*/
483 if (qlen >= f->qsize)
485 /* drop/mark the packet when PIE is active and burst time elapsed */
486 else if ((pst->sflags & PIE_ACTIVE) && pst->burst_allowance==0
487 && drop_early(pst, q->ni.len_bytes) == DROP) {
489 * if drop_prob over ECN threshold, drop the packet
490 * otherwise mark and enqueue it.
492 if ((pprms->flags & PIE_ECN_ENABLED) && pst->drop_prob <
493 (pprms->max_ecnth << (PIE_PROB_BITS - PIE_FIX_POINT_BITS))
500 /* Turn PIE on when 1/3 of the queue is full */
501 if (!(pst->sflags & PIE_ACTIVE) && qlen >= pst->one_third_q_size) {
502 init_activate_pie(pst, 1);
505 /* Reset burst tolerance and optinally turn PIE off*/
506 if ((pst->sflags & PIE_ACTIVE) && pst->drop_prob == 0 &&
507 pst->current_qdelay < (pprms->qdelay_ref >> 1) &&
508 pst->qdelay_old < (pprms->qdelay_ref >> 1)) {
510 pst->burst_allowance = pprms->max_burst;
511 if ((pprms->flags & PIE_ON_OFF_MODE_ENABLED) && qlen<=0)
515 /* Timestamp the packet if Departure Rate Estimation is disabled */
516 if (t != DROP && !(pprms->flags & PIE_DEPRATEEST_ENABLED)) {
517 /* Add TS to mbuf as a TAG */
519 mtag = m_tag_locate(m, MTAG_ABI_COMPAT, DN_AQM_MTAG_TS, NULL);
521 mtag = m_tag_alloc(MTAG_ABI_COMPAT, DN_AQM_MTAG_TS,
522 sizeof(aqm_time_t), M_NOWAIT);
527 *(aqm_time_t *)(mtag + 1) = AQM_UNOW;
528 m_tag_prepend(m, mtag);
532 mq_append(&q->mq, m);
533 update_stats(q, len, 0);
536 update_stats(q, 0, 1);
538 /* reset accu_prob after packet drop */
547 * initialize PIE for queue 'q'
548 * First allocate memory for PIE status.
551 aqm_pie_init(struct dn_queue *q)
553 struct pie_status *pst;
554 struct dn_aqm_pie_parms *pprms;
557 pprms = q->fs->aqmcfg;
559 do { /* exit with break when error occurs*/
561 DX(2, "AQM_PIE is not configured");
566 q->aqm_status = malloc(sizeof(struct pie_status),
567 M_DUMMYNET, M_NOWAIT | M_ZERO);
568 if (q->aqm_status == NULL) {
569 D("cannot allocate PIE private data");
575 /* increase reference count for PIE module */
576 pie_desc.ref_count++;
581 /* For speed optimization, we caculate 1/3 queue size once here */
582 // we can use x/3 = (x >>2) + (x >>4) + (x >>7)
583 pst->one_third_q_size = q->fs->fs.qsize/3;
585 mtx_init(&pst->lock_mtx, "mtx_pie", NULL, MTX_DEF);
586 callout_init_mtx(&pst->aqm_pie_callout, &pst->lock_mtx,
587 CALLOUT_RETURNUNLOCKED);
589 pst->current_qdelay = 0;
590 init_activate_pie(pst, !(pprms->flags & PIE_ON_OFF_MODE_ENABLED));
592 //DX(2, "aqm_PIE_init");
600 * Callout function to destroy pie mtx and free PIE status memory
603 pie_callout_cleanup(void *x)
605 struct pie_status *pst = (struct pie_status *) x;
607 mtx_unlock(&pst->lock_mtx);
608 mtx_destroy(&pst->lock_mtx);
611 pie_desc.ref_count--;
616 * Clean up PIE status for queue 'q'
617 * Destroy memory allocated for PIE status.
620 aqm_pie_cleanup(struct dn_queue *q)
627 struct pie_status *pst = q->aqm_status;
629 //D("queue is already cleaned up");
632 if(!q->fs || !q->fs->aqmcfg) {
633 D("fs is null or no cfg");
636 if (q->fs->aqmfp && q->fs->aqmfp->type !=DN_AQM_PIE) {
637 D("Not PIE fs (%d)", q->fs->fs.fs_nr);
642 * Free PIE status allocated memory using pie_callout_cleanup() callout
643 * function to avoid any potential race.
644 * We reset aqm_pie_callout to call pie_callout_cleanup() in next 1um. This
645 * stops the scheduled calculate_drop_prob() callout and call pie_callout_cleanup()
646 * which does memory freeing.
648 mtx_lock(&pst->lock_mtx);
649 callout_reset_sbt(&pst->aqm_pie_callout,
650 SBT_1US, 0, pie_callout_cleanup, pst, 0);
651 q->aqm_status = NULL;
652 mtx_unlock(&pst->lock_mtx);
658 * Config PIE parameters
659 * also allocate memory for PIE configurations
662 aqm_pie_config(struct dn_fsk* fs, struct dn_extra_parms *ep, int len)
664 struct dn_aqm_pie_parms *pcfg;
666 int l = sizeof(struct dn_extra_parms);
668 D("invalid sched parms length got %d need %d", len, l);
671 /* we free the old cfg because maybe the orignal allocation
672 * was used for diffirent AQM type.
675 free(fs->aqmcfg, M_DUMMYNET);
679 fs->aqmcfg = malloc(sizeof(struct dn_aqm_pie_parms),
680 M_DUMMYNET, M_NOWAIT | M_ZERO);
681 if (fs->aqmcfg== NULL) {
682 D("cannot allocate PIE configuration parameters");
686 /* par array contains pie configuration as follow
687 * 0- qdelay_ref,1- tupdate, 2- max_burst
688 * 3- max_ecnth, 4- alpha, 5- beta, 6- flags
691 /* configure PIE parameters */
695 pcfg->qdelay_ref = pie_sysctl.qdelay_ref * AQM_TIME_1US;
697 pcfg->qdelay_ref = ep->par[0];
699 pcfg->tupdate = pie_sysctl.tupdate * AQM_TIME_1US;
701 pcfg->tupdate = ep->par[1];
703 pcfg->max_burst = pie_sysctl.max_burst * AQM_TIME_1US;
705 pcfg->max_burst = ep->par[2];
707 pcfg->max_ecnth = pie_sysctl.max_ecnth;
709 pcfg->max_ecnth = ep->par[3];
711 pcfg->alpha = pie_sysctl.alpha;
713 pcfg->alpha = ep->par[4];
715 pcfg->beta = pie_sysctl.beta;
717 pcfg->beta = ep->par[5];
719 pcfg->flags = pie_sysctl.flags;
721 pcfg->flags = ep->par[6];
723 /* bound PIE configurations */
724 pcfg->qdelay_ref = BOUND_VAR(pcfg->qdelay_ref, 1, 10 * AQM_TIME_1S);
725 pcfg->tupdate = BOUND_VAR(pcfg->tupdate, 1, 10 * AQM_TIME_1S);
726 pcfg->max_burst = BOUND_VAR(pcfg->max_burst, 0, 10 * AQM_TIME_1S);
727 pcfg->max_ecnth = BOUND_VAR(pcfg->max_ecnth, 0, PIE_SCALE);
728 pcfg->alpha = BOUND_VAR(pcfg->alpha, 0, 7 * PIE_SCALE);
729 pcfg->beta = BOUND_VAR(pcfg->beta, 0 , 7 * PIE_SCALE);
731 pie_desc.cfg_ref_count++;
732 //D("pie cfg_ref_count=%d", pie_desc.cfg_ref_count);
737 * Deconfigure PIE and free memory allocation
740 aqm_pie_deconfig(struct dn_fsk* fs)
742 if (fs && fs->aqmcfg) {
743 free(fs->aqmcfg, M_DUMMYNET);
745 pie_desc.cfg_ref_count--;
751 * Retrieve PIE configuration parameters.
754 aqm_pie_getconfig (struct dn_fsk *fs, struct dn_extra_parms * ep)
756 struct dn_aqm_pie_parms *pcfg;
758 strcpy(ep->name, pie_desc.name);
760 ep->par[0] = pcfg->qdelay_ref / AQM_TIME_1US;
761 ep->par[1] = pcfg->tupdate / AQM_TIME_1US;
762 ep->par[2] = pcfg->max_burst / AQM_TIME_1US;
763 ep->par[3] = pcfg->max_ecnth;
764 ep->par[4] = pcfg->alpha;
765 ep->par[5] = pcfg->beta;
766 ep->par[6] = pcfg->flags;
773 static struct dn_aqm pie_desc = {
774 _SI( .type = ) DN_AQM_PIE,
775 _SI( .name = ) "PIE",
776 _SI( .ref_count = ) 0,
777 _SI( .cfg_ref_count = ) 0,
778 _SI( .enqueue = ) aqm_pie_enqueue,
779 _SI( .dequeue = ) aqm_pie_dequeue,
780 _SI( .config = ) aqm_pie_config,
781 _SI( .deconfig = ) aqm_pie_deconfig,
782 _SI( .getconfig = ) aqm_pie_getconfig,
783 _SI( .init = ) aqm_pie_init,
784 _SI( .cleanup = ) aqm_pie_cleanup,
787 DECLARE_DNAQM_MODULE(dn_aqm_pie, &pie_desc);