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, pie,
166 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
170 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, target,
171 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
172 pie_sysctl_target_tupdate_maxb_handler, "L",
173 "queue target in microsecond");
174 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, tupdate,
175 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
176 pie_sysctl_target_tupdate_maxb_handler, "L",
177 "the frequency of drop probability calculation in microsecond");
178 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, max_burst,
179 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
180 pie_sysctl_target_tupdate_maxb_handler, "L",
181 "Burst allowance interval in microsecond");
183 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, max_ecnth,
184 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
185 pie_sysctl_max_ecnth_handler, "L",
186 "ECN safeguard threshold scaled by 1000");
188 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, alpha,
189 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
190 pie_sysctl_alpha_beta_handler, "L",
191 "PIE alpha scaled by 1000");
192 SYSCTL_PROC(_net_inet_ip_dummynet_pie, OID_AUTO, beta,
193 CTLTYPE_LONG | CTLFLAG_RW | CTLFLAG_NEEDGIANT, NULL, 0,
194 pie_sysctl_alpha_beta_handler, "L",
195 "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;
212 prob = pst->drop_prob;
214 /* calculate current qdelay using DRE method.
215 * If TS is used and no data in the queue, reset current_qdelay
216 * as it stays at last value during dequeue process.
218 if (pprms->flags & PIE_DEPRATEEST_ENABLED)
219 pst->current_qdelay = ((uint64_t)pst->pq->ni.len_bytes *
220 pst->avg_dq_time) >> PIE_DQ_THRESHOLD_BITS;
222 if (!pst->pq->ni.len_bytes)
223 pst->current_qdelay = 0;
225 /* calculate drop probability */
226 p = (int64_t)pprms->alpha *
227 ((int64_t)pst->current_qdelay - (int64_t)pprms->qdelay_ref);
228 p +=(int64_t) pprms->beta *
229 ((int64_t)pst->current_qdelay - (int64_t)pst->qdelay_old);
231 /* take absolute value so right shift result is well defined */
237 /* We PIE_MAX_PROB shift by 12-bits to increase the division precision */
238 p *= (PIE_MAX_PROB << 12) / AQM_TIME_1S;
240 /* auto-tune drop probability */
241 if (prob < (PIE_MAX_PROB / 1000000)) /* 0.000001 */
242 p >>= 11 + PIE_FIX_POINT_BITS + 12;
243 else if (prob < (PIE_MAX_PROB / 100000)) /* 0.00001 */
244 p >>= 9 + PIE_FIX_POINT_BITS + 12;
245 else if (prob < (PIE_MAX_PROB / 10000)) /* 0.0001 */
246 p >>= 7 + PIE_FIX_POINT_BITS + 12;
247 else if (prob < (PIE_MAX_PROB / 1000)) /* 0.001 */
248 p >>= 5 + PIE_FIX_POINT_BITS + 12;
249 else if (prob < (PIE_MAX_PROB / 100)) /* 0.01 */
250 p >>= 3 + PIE_FIX_POINT_BITS + 12;
251 else if (prob < (PIE_MAX_PROB / 10)) /* 0.1 */
252 p >>= 1 + PIE_FIX_POINT_BITS + 12;
254 p >>= PIE_FIX_POINT_BITS + 12;
261 /* check for multiplication underflow */
262 if (prob > oldprob) {
267 /* Cap Drop adjustment */
268 if ((pprms->flags & PIE_CAPDROP_ENABLED) &&
269 prob >= PIE_MAX_PROB / 10 &&
270 p > PIE_MAX_PROB / 50 ) {
271 p = PIE_MAX_PROB / 50;
276 /* check for multiplication overflow */
284 * decay the drop probability exponentially
285 * and restrict it to range 0 to PIE_MAX_PROB
290 if (pst->current_qdelay == 0 && pst->qdelay_old == 0) {
291 /* 0.98 ~= 1- 1/64 */
292 prob = prob - (prob >> 6);
295 if (prob > PIE_MAX_PROB) {
300 pst->drop_prob = prob;
302 /* store current queue delay value in old queue delay*/
303 pst->qdelay_old = pst->current_qdelay;
305 /* update burst allowance */
306 if ((pst->sflags & PIE_ACTIVE) && pst->burst_allowance>0) {
308 if (pst->burst_allowance > pprms->tupdate )
309 pst->burst_allowance -= pprms->tupdate;
311 pst->burst_allowance = 0;
314 /* reschedule calculate_drop_prob function */
315 if (pst->sflags & PIE_ACTIVE)
316 callout_reset_sbt(&pst->aqm_pie_callout,
317 (uint64_t)pprms->tupdate * SBT_1US, 0, calculate_drop_prob, pst, 0);
319 mtx_unlock(&pst->lock_mtx);
323 * Extract a packet from the head of queue 'q'
324 * Return a packet or NULL if the queue is empty.
325 * If getts is set, also extract packet's timestamp from mtag.
328 pie_extract_head(struct dn_queue *q, aqm_time_t *pkt_ts, int getts)
331 struct mbuf *m = q->mq.head;
335 q->mq.head = m->m_nextpkt;
338 update_stats(q, -m->m_pkthdr.len, 0);
340 if (q->ni.length == 0) /* queue is now idle */
341 q->q_time = dn_cfg.curr_time;
344 /* extract packet TS*/
345 mtag = m_tag_locate(m, MTAG_ABI_COMPAT, DN_AQM_MTAG_TS, NULL);
347 D("PIE timestamp mtag not found!");
350 *pkt_ts = *(aqm_time_t *)(mtag + 1);
351 m_tag_delete(m,mtag);
358 * Initiate PIE variable and optionally activate it
361 init_activate_pie(struct pie_status *pst, int resettimer)
363 struct dn_aqm_pie_parms *pprms;
365 mtx_lock(&pst->lock_mtx);
369 pst->burst_allowance = pprms->max_burst;
372 pst->avg_dq_time = 0;
373 pst->sflags = PIE_INMEASUREMENT;
374 pst->measurement_start = AQM_UNOW;
377 pst->sflags |= PIE_ACTIVE;
378 callout_reset_sbt(&pst->aqm_pie_callout,
379 (uint64_t)pprms->tupdate * SBT_1US,
380 0, calculate_drop_prob, pst, 0);
382 //DX(2, "PIE Activated");
383 mtx_unlock(&pst->lock_mtx);
387 * Deactivate PIE and stop probe update callout
390 deactivate_pie(struct pie_status *pst)
392 mtx_lock(&pst->lock_mtx);
393 pst->sflags &= ~(PIE_ACTIVE | PIE_INMEASUREMENT);
394 callout_stop(&pst->aqm_pie_callout);
395 //D("PIE Deactivated");
396 mtx_unlock(&pst->lock_mtx);
400 * Dequeue and return a pcaket from queue 'q' or NULL if 'q' is empty.
401 * Also, caculate depature time or queue delay using timestamp
404 aqm_pie_dequeue(struct dn_queue *q)
407 struct dn_flow *ni; /* stats for scheduler instance */
408 struct dn_aqm_pie_parms *pprms;
409 struct pie_status *pst;
411 aqm_time_t pkt_ts, dq_time;
418 /*we extarct packet ts only when Departure Rate Estimation dis not used*/
419 m = pie_extract_head(q, &pkt_ts, !(pprms->flags & PIE_DEPRATEEST_ENABLED));
421 if (!m || !(pst->sflags & PIE_ACTIVE))
425 if (pprms->flags & PIE_DEPRATEEST_ENABLED) {
426 /* calculate average depature time */
427 if(pst->sflags & PIE_INMEASUREMENT) {
428 pst->dq_count += m->m_pkthdr.len;
430 if (pst->dq_count >= PIE_DQ_THRESHOLD) {
431 dq_time = now - pst->measurement_start;
434 * if we don't have old avg dq_time i.e PIE is (re)initialized,
435 * don't use weight to calculate new avg_dq_time
437 if(pst->avg_dq_time == 0)
438 pst->avg_dq_time = dq_time;
441 * weight = PIE_DQ_THRESHOLD/2^6, but we scaled
442 * weight by 2^8. Thus, scaled
443 * weight = PIE_DQ_THRESHOLD /2^8
445 w = PIE_DQ_THRESHOLD >> 8;
446 pst->avg_dq_time = (dq_time* w
447 + (pst->avg_dq_time * ((1L << 8) - w))) >> 8;
448 pst->sflags &= ~PIE_INMEASUREMENT;
454 * Start new measurment cycle when the queue has
455 * PIE_DQ_THRESHOLD worth of bytes.
457 if(!(pst->sflags & PIE_INMEASUREMENT) &&
458 q->ni.len_bytes >= PIE_DQ_THRESHOLD) {
459 pst->sflags |= PIE_INMEASUREMENT;
460 pst->measurement_start = now;
464 /* Optionally, use packet timestamp to estimate queue delay */
466 pst->current_qdelay = now - pkt_ts;
472 * Enqueue a packet in q, subject to space and PIE queue management policy
473 * (whose parameters are in q->fs).
474 * Update stats for the queue and the scheduler.
475 * Return 0 on success, 1 on drop. The packet is consumed anyways.
478 aqm_pie_enqueue(struct dn_queue *q, struct mbuf* m)
483 struct pie_status *pst;
484 struct dn_aqm_pie_parms *pprms;
487 len = m->m_pkthdr.len;
490 DX(2, "PIE queue is not initialized\n");
491 update_stats(q, 0, 1);
500 /* get current queue length in bytes or packets*/
501 qlen = (f->flags & DN_QSIZE_BYTES) ?
502 q->ni.len_bytes : q->ni.length;
504 /* check for queue size and drop the tail if exceed queue limit*/
505 if (qlen >= f->qsize)
507 /* drop/mark the packet when PIE is active and burst time elapsed */
508 else if ((pst->sflags & PIE_ACTIVE) && pst->burst_allowance==0
509 && drop_early(pst, q->ni.len_bytes) == DROP) {
511 * if drop_prob over ECN threshold, drop the packet
512 * otherwise mark and enqueue it.
514 if ((pprms->flags & PIE_ECN_ENABLED) && pst->drop_prob <
515 (pprms->max_ecnth << (PIE_PROB_BITS - PIE_FIX_POINT_BITS))
522 /* Turn PIE on when 1/3 of the queue is full */
523 if (!(pst->sflags & PIE_ACTIVE) && qlen >= pst->one_third_q_size) {
524 init_activate_pie(pst, 1);
527 /* Reset burst tolerance and optinally turn PIE off*/
528 if ((pst->sflags & PIE_ACTIVE) && pst->drop_prob == 0 &&
529 pst->current_qdelay < (pprms->qdelay_ref >> 1) &&
530 pst->qdelay_old < (pprms->qdelay_ref >> 1)) {
531 pst->burst_allowance = pprms->max_burst;
532 if ((pprms->flags & PIE_ON_OFF_MODE_ENABLED) && qlen<=0)
536 /* Timestamp the packet if Departure Rate Estimation is disabled */
537 if (t != DROP && !(pprms->flags & PIE_DEPRATEEST_ENABLED)) {
538 /* Add TS to mbuf as a TAG */
540 mtag = m_tag_locate(m, MTAG_ABI_COMPAT, DN_AQM_MTAG_TS, NULL);
542 mtag = m_tag_alloc(MTAG_ABI_COMPAT, DN_AQM_MTAG_TS,
543 sizeof(aqm_time_t), M_NOWAIT);
548 *(aqm_time_t *)(mtag + 1) = AQM_UNOW;
549 m_tag_prepend(m, mtag);
553 mq_append(&q->mq, m);
554 update_stats(q, len, 0);
557 update_stats(q, 0, 1);
559 /* reset accu_prob after packet drop */
568 * initialize PIE for queue 'q'
569 * First allocate memory for PIE status.
572 aqm_pie_init(struct dn_queue *q)
574 struct pie_status *pst;
575 struct dn_aqm_pie_parms *pprms;
578 pprms = q->fs->aqmcfg;
580 do { /* exit with break when error occurs*/
582 DX(2, "AQM_PIE is not configured");
587 q->aqm_status = malloc(sizeof(struct pie_status),
588 M_DUMMYNET, M_NOWAIT | M_ZERO);
589 if (q->aqm_status == NULL) {
590 D("cannot allocate PIE private data");
596 /* increase reference count for PIE module */
597 pie_desc.ref_count++;
602 /* For speed optimization, we caculate 1/3 queue size once here */
603 // we can use x/3 = (x >>2) + (x >>4) + (x >>7)
604 pst->one_third_q_size = q->fs->fs.qsize/3;
606 mtx_init(&pst->lock_mtx, "mtx_pie", NULL, MTX_DEF);
607 callout_init_mtx(&pst->aqm_pie_callout, &pst->lock_mtx,
608 CALLOUT_RETURNUNLOCKED);
610 pst->current_qdelay = 0;
611 init_activate_pie(pst, !(pprms->flags & PIE_ON_OFF_MODE_ENABLED));
613 //DX(2, "aqm_PIE_init");
621 * Callout function to destroy pie mtx and free PIE status memory
624 pie_callout_cleanup(void *x)
626 struct pie_status *pst = (struct pie_status *) x;
628 mtx_unlock(&pst->lock_mtx);
629 mtx_destroy(&pst->lock_mtx);
632 pie_desc.ref_count--;
637 * Clean up PIE status for queue 'q'
638 * Destroy memory allocated for PIE status.
641 aqm_pie_cleanup(struct dn_queue *q)
648 struct pie_status *pst = q->aqm_status;
650 //D("queue is already cleaned up");
653 if(!q->fs || !q->fs->aqmcfg) {
654 D("fs is null or no cfg");
657 if (q->fs->aqmfp && q->fs->aqmfp->type !=DN_AQM_PIE) {
658 D("Not PIE fs (%d)", q->fs->fs.fs_nr);
663 * Free PIE status allocated memory using pie_callout_cleanup() callout
664 * function to avoid any potential race.
665 * We reset aqm_pie_callout to call pie_callout_cleanup() in next 1um. This
666 * stops the scheduled calculate_drop_prob() callout and call pie_callout_cleanup()
667 * which does memory freeing.
669 mtx_lock(&pst->lock_mtx);
670 callout_reset_sbt(&pst->aqm_pie_callout,
671 SBT_1US, 0, pie_callout_cleanup, pst, 0);
672 q->aqm_status = NULL;
673 mtx_unlock(&pst->lock_mtx);
679 * Config PIE parameters
680 * also allocate memory for PIE configurations
683 aqm_pie_config(struct dn_fsk* fs, struct dn_extra_parms *ep, int len)
685 struct dn_aqm_pie_parms *pcfg;
687 int l = sizeof(struct dn_extra_parms);
689 D("invalid sched parms length got %d need %d", len, l);
692 /* we free the old cfg because maybe the orignal allocation
693 * was used for diffirent AQM type.
696 free(fs->aqmcfg, M_DUMMYNET);
700 fs->aqmcfg = malloc(sizeof(struct dn_aqm_pie_parms),
701 M_DUMMYNET, M_NOWAIT | M_ZERO);
702 if (fs->aqmcfg== NULL) {
703 D("cannot allocate PIE configuration parameters");
707 /* par array contains pie configuration as follow
708 * 0- qdelay_ref,1- tupdate, 2- max_burst
709 * 3- max_ecnth, 4- alpha, 5- beta, 6- flags
712 /* configure PIE parameters */
716 pcfg->qdelay_ref = pie_sysctl.qdelay_ref * AQM_TIME_1US;
718 pcfg->qdelay_ref = ep->par[0];
720 pcfg->tupdate = pie_sysctl.tupdate * AQM_TIME_1US;
722 pcfg->tupdate = ep->par[1];
724 pcfg->max_burst = pie_sysctl.max_burst * AQM_TIME_1US;
726 pcfg->max_burst = ep->par[2];
728 pcfg->max_ecnth = pie_sysctl.max_ecnth;
730 pcfg->max_ecnth = ep->par[3];
732 pcfg->alpha = pie_sysctl.alpha;
734 pcfg->alpha = ep->par[4];
736 pcfg->beta = pie_sysctl.beta;
738 pcfg->beta = ep->par[5];
740 pcfg->flags = pie_sysctl.flags;
742 pcfg->flags = ep->par[6];
744 /* bound PIE configurations */
745 pcfg->qdelay_ref = BOUND_VAR(pcfg->qdelay_ref, 1, 10 * AQM_TIME_1S);
746 pcfg->tupdate = BOUND_VAR(pcfg->tupdate, 1, 10 * AQM_TIME_1S);
747 pcfg->max_burst = BOUND_VAR(pcfg->max_burst, 0, 10 * AQM_TIME_1S);
748 pcfg->max_ecnth = BOUND_VAR(pcfg->max_ecnth, 0, PIE_SCALE);
749 pcfg->alpha = BOUND_VAR(pcfg->alpha, 0, 7 * PIE_SCALE);
750 pcfg->beta = BOUND_VAR(pcfg->beta, 0 , 7 * PIE_SCALE);
752 pie_desc.cfg_ref_count++;
753 //D("pie cfg_ref_count=%d", pie_desc.cfg_ref_count);
758 * Deconfigure PIE and free memory allocation
761 aqm_pie_deconfig(struct dn_fsk* fs)
763 if (fs && fs->aqmcfg) {
764 free(fs->aqmcfg, M_DUMMYNET);
766 pie_desc.cfg_ref_count--;
772 * Retrieve PIE configuration parameters.
775 aqm_pie_getconfig (struct dn_fsk *fs, struct dn_extra_parms * ep)
777 struct dn_aqm_pie_parms *pcfg;
779 strlcpy(ep->name, pie_desc.name, sizeof(ep->name));
781 ep->par[0] = pcfg->qdelay_ref / AQM_TIME_1US;
782 ep->par[1] = pcfg->tupdate / AQM_TIME_1US;
783 ep->par[2] = pcfg->max_burst / AQM_TIME_1US;
784 ep->par[3] = pcfg->max_ecnth;
785 ep->par[4] = pcfg->alpha;
786 ep->par[5] = pcfg->beta;
787 ep->par[6] = pcfg->flags;
794 static struct dn_aqm pie_desc = {
795 _SI( .type = ) DN_AQM_PIE,
796 _SI( .name = ) "PIE",
797 _SI( .ref_count = ) 0,
798 _SI( .cfg_ref_count = ) 0,
799 _SI( .enqueue = ) aqm_pie_enqueue,
800 _SI( .dequeue = ) aqm_pie_dequeue,
801 _SI( .config = ) aqm_pie_config,
802 _SI( .deconfig = ) aqm_pie_deconfig,
803 _SI( .getconfig = ) aqm_pie_getconfig,
804 _SI( .init = ) aqm_pie_init,
805 _SI( .cleanup = ) aqm_pie_cleanup,
808 DECLARE_DNAQM_MODULE(dn_aqm_pie, &pie_desc);