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pkt_sched: Remove comment reference to old style TX locking.
[deliverable/linux.git] / net / sched / sch_hfsc.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (c) 2003 Patrick McHardy, <kaber@trash.net>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * 2003-10-17 - Ported from altq
10 */
11/*
12 * Copyright (c) 1997-1999 Carnegie Mellon University. All Rights Reserved.
13 *
14 * Permission to use, copy, modify, and distribute this software and
15 * its documentation is hereby granted (including for commercial or
16 * for-profit use), provided that both the copyright notice and this
17 * permission notice appear in all copies of the software, derivative
18 * works, or modified versions, and any portions thereof.
19 *
20 * THIS SOFTWARE IS EXPERIMENTAL AND IS KNOWN TO HAVE BUGS, SOME OF
21 * WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON PROVIDES THIS
22 * SOFTWARE IN ITS ``AS IS'' CONDITION, AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
32 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
33 * DAMAGE.
34 *
35 * Carnegie Mellon encourages (but does not require) users of this
36 * software to return any improvements or extensions that they make,
37 * and to grant Carnegie Mellon the rights to redistribute these
38 * changes without encumbrance.
39 */
40/*
41 * H-FSC is described in Proceedings of SIGCOMM'97,
42 * "A Hierarchical Fair Service Curve Algorithm for Link-Sharing,
43 * Real-Time and Priority Service"
44 * by Ion Stoica, Hui Zhang, and T. S. Eugene Ng.
45 *
46 * Oleg Cherevko <olwi@aq.ml.com.ua> added the upperlimit for link-sharing.
47 * when a class has an upperlimit, the fit-time is computed from the
48 * upperlimit service curve. the link-sharing scheduler does not schedule
49 * a class whose fit-time exceeds the current time.
50 */
51
52#include <linux/kernel.h>
1da177e4
LT		 53#include <linux/module.h>
54#include <linux/types.h>
55#include <linux/errno.h>
1da177e4
LT		 56#include <linux/compiler.h>
57#include <linux/spinlock.h>
58#include <linux/skbuff.h>
59#include <linux/string.h>
60#include <linux/slab.h>
1da177e4
LT		 61#include <linux/list.h>
62#include <linux/rbtree.h>
63#include <linux/init.h>
1da177e4
LT		 64#include <linux/rtnetlink.h>
65#include <linux/pkt_sched.h>
dc5fc579 66#include <net/netlink.h>
1da177e4
LT		 67#include <net/pkt_sched.h>
68#include <net/pkt_cls.h>
1da177e4
LT		 69#include <asm/div64.h>
70
1da177e4
LT		 71/*
72 * kernel internal service curve representation:
73 * coordinates are given by 64 bit unsigned integers.
74 * x-axis: unit is clock count.
75 * y-axis: unit is byte.
76 *
77 * The service curve parameters are converted to the internal
78 * representation. The slope values are scaled to avoid overflow.
79 * the inverse slope values as well as the y-projection of the 1st
80 * segment are kept in order to to avoid 64-bit divide operations
81 * that are expensive on 32-bit architectures.
82 */
83
84struct internal_sc
85{
86 u64 sm1; /* scaled slope of the 1st segment */
87 u64 ism1; /* scaled inverse-slope of the 1st segment */
88 u64 dx; /* the x-projection of the 1st segment */
89 u64 dy; /* the y-projection of the 1st segment */
90 u64 sm2; /* scaled slope of the 2nd segment */
91 u64 ism2; /* scaled inverse-slope of the 2nd segment */
92};
93
94/* runtime service curve */
95struct runtime_sc
96{
97 u64 x; /* current starting position on x-axis */
98 u64 y; /* current starting position on y-axis */
99 u64 sm1; /* scaled slope of the 1st segment */
100 u64 ism1; /* scaled inverse-slope of the 1st segment */
101 u64 dx; /* the x-projection of the 1st segment */
102 u64 dy; /* the y-projection of the 1st segment */
103 u64 sm2; /* scaled slope of the 2nd segment */
104 u64 ism2; /* scaled inverse-slope of the 2nd segment */
105};
106
107enum hfsc_class_flags
108{
109 HFSC_RSC = 0x1,
110 HFSC_FSC = 0x2,
111 HFSC_USC = 0x4
112};
113
114struct hfsc_class
115{
be0d39d5 116 struct Qdisc_class_common cl_common;
1da177e4
LT		 117 unsigned int refcnt; /* usage count */
118
119 struct gnet_stats_basic bstats;
120 struct gnet_stats_queue qstats;
121 struct gnet_stats_rate_est rate_est;
1da177e4
LT		 122 unsigned int level; /* class level in hierarchy */
123 struct tcf_proto *filter_list; /* filter list */
124 unsigned int filter_cnt; /* filter count */
125
126 struct hfsc_sched *sched; /* scheduler data */
127 struct hfsc_class *cl_parent; /* parent class */
128 struct list_head siblings; /* sibling classes */
129 struct list_head children; /* child classes */
130 struct Qdisc *qdisc; /* leaf qdisc */
131
132 struct rb_node el_node; /* qdisc's eligible tree member */
133 struct rb_root vt_tree; /* active children sorted by cl_vt */
134 struct rb_node vt_node; /* parent's vt_tree member */
135 struct rb_root cf_tree; /* active children sorted by cl_f */
136 struct rb_node cf_node; /* parent's cf_heap member */
1da177e4
LT		 137 struct list_head dlist; /* drop list member */
138
139 u64 cl_total; /* total work in bytes */
140 u64 cl_cumul; /* cumulative work in bytes done by
141 real-time criteria */
142
143 u64 cl_d; /* deadline*/
144 u64 cl_e; /* eligible time */
145 u64 cl_vt; /* virtual time */
146 u64 cl_f; /* time when this class will fit for
147 link-sharing, max(myf, cfmin) */
148 u64 cl_myf; /* my fit-time (calculated from this
149 class's own upperlimit curve) */
150 u64 cl_myfadj; /* my fit-time adjustment (to cancel
151 history dependence) */
152 u64 cl_cfmin; /* earliest children's fit-time (used
153 with cl_myf to obtain cl_f) */
154 u64 cl_cvtmin; /* minimal virtual time among the
155 children fit for link-sharing
156 (monotonic within a period) */
157 u64 cl_vtadj; /* intra-period cumulative vt
158 adjustment */
159 u64 cl_vtoff; /* inter-period cumulative vt offset */
160 u64 cl_cvtmax; /* max child's vt in the last period */
161 u64 cl_cvtoff; /* cumulative cvtmax of all periods */
9a94b351 162 u64 cl_pcvtoff; /* parent's cvtoff at initialization
1da177e4
LT		 163 time */
164
165 struct internal_sc cl_rsc; /* internal real-time service curve */
166 struct internal_sc cl_fsc; /* internal fair service curve */
167 struct internal_sc cl_usc; /* internal upperlimit service curve */
168 struct runtime_sc cl_deadline; /* deadline curve */
169 struct runtime_sc cl_eligible; /* eligible curve */
170 struct runtime_sc cl_virtual; /* virtual curve */
171 struct runtime_sc cl_ulimit; /* upperlimit curve */
172
173 unsigned long cl_flags; /* which curves are valid */
174 unsigned long cl_vtperiod; /* vt period sequence number */
175 unsigned long cl_parentperiod;/* parent's vt period sequence number*/
176 unsigned long cl_nactive; /* number of active children */
177};
178
1da177e4
LT		 179struct hfsc_sched
180{
181 u16 defcls; /* default class id */
182 struct hfsc_class root; /* root class */
be0d39d5 183 struct Qdisc_class_hash clhash; /* class hash */
1da177e4
LT		 184 struct rb_root eligible; /* eligible tree */
185 struct list_head droplist; /* active leaf class list (for
186 dropping) */
187 struct sk_buff_head requeue; /* requeued packet */
ed2b229a 188 struct qdisc_watchdog watchdog; /* watchdog timer */
1da177e4
LT		 189};
190
1da177e4
LT		 191#define HT_INFINITY 0xffffffffffffffffULL /* infinite time value */
192
193
194/*
195 * eligible tree holds backlogged classes being sorted by their eligible times.
196 * there is one eligible tree per hfsc instance.
197 */
198
199static void
200eltree_insert(struct hfsc_class *cl)
201{
202 struct rb_node **p = &cl->sched->eligible.rb_node;
203 struct rb_node *parent = NULL;
204 struct hfsc_class *cl1;
205
206 while (*p != NULL) {
207 parent = *p;
208 cl1 = rb_entry(parent, struct hfsc_class, el_node);
209 if (cl->cl_e >= cl1->cl_e)
210 p = &parent->rb_right;
211 else
212 p = &parent->rb_left;
213 }
214 rb_link_node(&cl->el_node, parent, p);
215 rb_insert_color(&cl->el_node, &cl->sched->eligible);
216}
217
218static inline void
219eltree_remove(struct hfsc_class *cl)
220{
221 rb_erase(&cl->el_node, &cl->sched->eligible);
222}
223
224static inline void
225eltree_update(struct hfsc_class *cl)
226{
227 eltree_remove(cl);
228 eltree_insert(cl);
229}
230
231/* find the class with the minimum deadline among the eligible classes */
232static inline struct hfsc_class *
233eltree_get_mindl(struct hfsc_sched *q, u64 cur_time)
234{
235 struct hfsc_class *p, *cl = NULL;
236 struct rb_node *n;
237
238 for (n = rb_first(&q->eligible); n != NULL; n = rb_next(n)) {
239 p = rb_entry(n, struct hfsc_class, el_node);
240 if (p->cl_e > cur_time)
241 break;
242 if (cl == NULL || p->cl_d < cl->cl_d)
243 cl = p;
244 }
245 return cl;
246}
247
248/* find the class with minimum eligible time among the eligible classes */
249static inline struct hfsc_class *
250eltree_get_minel(struct hfsc_sched *q)
251{
252 struct rb_node *n;
10297b99 253
1da177e4
LT		 254 n = rb_first(&q->eligible);
255 if (n == NULL)
256 return NULL;
257 return rb_entry(n, struct hfsc_class, el_node);
258}
259
260/*
261 * vttree holds holds backlogged child classes being sorted by their virtual
262 * time. each intermediate class has one vttree.
263 */
264static void
265vttree_insert(struct hfsc_class *cl)
266{
267 struct rb_node **p = &cl->cl_parent->vt_tree.rb_node;
268 struct rb_node *parent = NULL;
269 struct hfsc_class *cl1;
270
271 while (*p != NULL) {
272 parent = *p;
273 cl1 = rb_entry(parent, struct hfsc_class, vt_node);
274 if (cl->cl_vt >= cl1->cl_vt)
275 p = &parent->rb_right;
276 else
277 p = &parent->rb_left;
278 }
279 rb_link_node(&cl->vt_node, parent, p);
280 rb_insert_color(&cl->vt_node, &cl->cl_parent->vt_tree);
281}
282
283static inline void
284vttree_remove(struct hfsc_class *cl)
285{
286 rb_erase(&cl->vt_node, &cl->cl_parent->vt_tree);
287}
288
289static inline void
290vttree_update(struct hfsc_class *cl)
291{
292 vttree_remove(cl);
293 vttree_insert(cl);
294}
295
296static inline struct hfsc_class *
297vttree_firstfit(struct hfsc_class *cl, u64 cur_time)
298{
299 struct hfsc_class *p;
300 struct rb_node *n;
301
302 for (n = rb_first(&cl->vt_tree); n != NULL; n = rb_next(n)) {
303 p = rb_entry(n, struct hfsc_class, vt_node);
304 if (p->cl_f <= cur_time)
305 return p;
306 }
307 return NULL;
308}
309
310/*
311 * get the leaf class with the minimum vt in the hierarchy
312 */
313static struct hfsc_class *
314vttree_get_minvt(struct hfsc_class *cl, u64 cur_time)
315{
316 /* if root-class's cfmin is bigger than cur_time nothing to do */
317 if (cl->cl_cfmin > cur_time)
318 return NULL;
319
320 while (cl->level > 0) {
321 cl = vttree_firstfit(cl, cur_time);
322 if (cl == NULL)
323 return NULL;
324 /*
325 * update parent's cl_cvtmin.
326 */
327 if (cl->cl_parent->cl_cvtmin < cl->cl_vt)
328 cl->cl_parent->cl_cvtmin = cl->cl_vt;
329 }
330 return cl;
331}
332
333static void
334cftree_insert(struct hfsc_class *cl)
335{
336 struct rb_node **p = &cl->cl_parent->cf_tree.rb_node;
337 struct rb_node *parent = NULL;
338 struct hfsc_class *cl1;
339
340 while (*p != NULL) {
341 parent = *p;
342 cl1 = rb_entry(parent, struct hfsc_class, cf_node);
343 if (cl->cl_f >= cl1->cl_f)
344 p = &parent->rb_right;
345 else
346 p = &parent->rb_left;
347 }
348 rb_link_node(&cl->cf_node, parent, p);
349 rb_insert_color(&cl->cf_node, &cl->cl_parent->cf_tree);
350}
351
352static inline void
353cftree_remove(struct hfsc_class *cl)
354{
355 rb_erase(&cl->cf_node, &cl->cl_parent->cf_tree);
356}
357
358static inline void
359cftree_update(struct hfsc_class *cl)
360{
361 cftree_remove(cl);
362 cftree_insert(cl);
363}
364
365/*
366 * service curve support functions
367 *
368 * external service curve parameters
369 * m: bps
370 * d: us
371 * internal service curve parameters
372 * sm: (bytes/psched_us) << SM_SHIFT
373 * ism: (psched_us/byte) << ISM_SHIFT
374 * dx: psched_us
375 *
641b9e0e 376 * The clock source resolution with ktime is 1.024us.
1da177e4
LT		 377 *
378 * sm and ism are scaled in order to keep effective digits.
379 * SM_SHIFT and ISM_SHIFT are selected to keep at least 4 effective
380 * digits in decimal using the following table.
381 *
1da177e4
LT		 382 * bits/sec 100Kbps 1Mbps 10Mbps 100Mbps 1Gbps
383 * ------------+-------------------------------------------------------
641b9e0e 384 * bytes/1.024us 12.8e-3 128e-3 1280e-3 12800e-3 128000e-3
1da177e4 385 *
641b9e0e 386 * 1.024us/byte 78.125 7.8125 0.78125 0.078125 0.0078125
1da177e4
LT		 387 */
388#define SM_SHIFT 20
389#define ISM_SHIFT 18
390
391#define SM_MASK ((1ULL << SM_SHIFT) - 1)
392#define ISM_MASK ((1ULL << ISM_SHIFT) - 1)
393
394static inline u64
395seg_x2y(u64 x, u64 sm)
396{
397 u64 y;
398
399 /*
400 * compute
401 * y = x * sm >> SM_SHIFT
402 * but divide it for the upper and lower bits to avoid overflow
403 */
404 y = (x >> SM_SHIFT) * sm + (((x & SM_MASK) * sm) >> SM_SHIFT);
405 return y;
406}
407
408static inline u64
409seg_y2x(u64 y, u64 ism)
410{
411 u64 x;
412
413 if (y == 0)
414 x = 0;
415 else if (ism == HT_INFINITY)
416 x = HT_INFINITY;
417 else {
418 x = (y >> ISM_SHIFT) * ism
419 + (((y & ISM_MASK) * ism) >> ISM_SHIFT);
420 }
421 return x;
422}
423
424/* Convert m (bps) into sm (bytes/psched us) */
425static u64
426m2sm(u32 m)
427{
428 u64 sm;
429
430 sm = ((u64)m << SM_SHIFT);
00c04af9
PM		 431 sm += PSCHED_TICKS_PER_SEC - 1;
432 do_div(sm, PSCHED_TICKS_PER_SEC);
1da177e4
LT		 433 return sm;
434}
435
436/* convert m (bps) into ism (psched us/byte) */
437static u64
438m2ism(u32 m)
439{
440 u64 ism;
441
442 if (m == 0)
443 ism = HT_INFINITY;
444 else {
00c04af9 445 ism = ((u64)PSCHED_TICKS_PER_SEC << ISM_SHIFT);
1da177e4
LT		 446 ism += m - 1;
447 do_div(ism, m);
448 }
449 return ism;
450}
451
452/* convert d (us) into dx (psched us) */
453static u64
454d2dx(u32 d)
455{
456 u64 dx;
457
00c04af9 458 dx = ((u64)d * PSCHED_TICKS_PER_SEC);
538e43a4
PM		 459 dx += USEC_PER_SEC - 1;
460 do_div(dx, USEC_PER_SEC);
1da177e4
LT		 461 return dx;
462}
463
464/* convert sm (bytes/psched us) into m (bps) */
465static u32
466sm2m(u64 sm)
467{
468 u64 m;
469
00c04af9 470 m = (sm * PSCHED_TICKS_PER_SEC) >> SM_SHIFT;
1da177e4
LT		 471 return (u32)m;
472}
473
474/* convert dx (psched us) into d (us) */
475static u32
476dx2d(u64 dx)
477{
478 u64 d;
479
538e43a4 480 d = dx * USEC_PER_SEC;
00c04af9 481 do_div(d, PSCHED_TICKS_PER_SEC);
1da177e4
LT		 482 return (u32)d;
483}
484
485static void
486sc2isc(struct tc_service_curve *sc, struct internal_sc *isc)
487{
488 isc->sm1 = m2sm(sc->m1);
489 isc->ism1 = m2ism(sc->m1);
490 isc->dx = d2dx(sc->d);
491 isc->dy = seg_x2y(isc->dx, isc->sm1);
492 isc->sm2 = m2sm(sc->m2);
493 isc->ism2 = m2ism(sc->m2);
494}
495
496/*
497 * initialize the runtime service curve with the given internal
498 * service curve starting at (x, y).
499 */
500static void
501rtsc_init(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y)
502{
503 rtsc->x = x;
504 rtsc->y = y;
505 rtsc->sm1 = isc->sm1;
506 rtsc->ism1 = isc->ism1;
507 rtsc->dx = isc->dx;
508 rtsc->dy = isc->dy;
509 rtsc->sm2 = isc->sm2;
510 rtsc->ism2 = isc->ism2;
511}
512
513/*
514 * calculate the y-projection of the runtime service curve by the
515 * given x-projection value
516 */
517static u64
518rtsc_y2x(struct runtime_sc *rtsc, u64 y)
519{
520 u64 x;
521
522 if (y < rtsc->y)
523 x = rtsc->x;
524 else if (y <= rtsc->y + rtsc->dy) {
525 /* x belongs to the 1st segment */
526 if (rtsc->dy == 0)
527 x = rtsc->x + rtsc->dx;
528 else
529 x = rtsc->x + seg_y2x(y - rtsc->y, rtsc->ism1);
530 } else {
531 /* x belongs to the 2nd segment */
532 x = rtsc->x + rtsc->dx
533 + seg_y2x(y - rtsc->y - rtsc->dy, rtsc->ism2);
534 }
535 return x;
536}
537
538static u64
539rtsc_x2y(struct runtime_sc *rtsc, u64 x)
540{
541 u64 y;
542
543 if (x <= rtsc->x)
544 y = rtsc->y;
545 else if (x <= rtsc->x + rtsc->dx)
546 /* y belongs to the 1st segment */
547 y = rtsc->y + seg_x2y(x - rtsc->x, rtsc->sm1);
548 else
549 /* y belongs to the 2nd segment */
550 y = rtsc->y + rtsc->dy
551 + seg_x2y(x - rtsc->x - rtsc->dx, rtsc->sm2);
552 return y;
553}
554
555/*
556 * update the runtime service curve by taking the minimum of the current
557 * runtime service curve and the service curve starting at (x, y).
558 */
559static void
560rtsc_min(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y)
561{
562 u64 y1, y2, dx, dy;
563 u32 dsm;
564
565 if (isc->sm1 <= isc->sm2) {
566 /* service curve is convex */
567 y1 = rtsc_x2y(rtsc, x);
568 if (y1 < y)
569 /* the current rtsc is smaller */
570 return;
571 rtsc->x = x;
572 rtsc->y = y;
573 return;
574 }
575
576 /*
577 * service curve is concave
578 * compute the two y values of the current rtsc
579 * y1: at x
580 * y2: at (x + dx)
581 */
582 y1 = rtsc_x2y(rtsc, x);
583 if (y1 <= y) {
584 /* rtsc is below isc, no change to rtsc */
585 return;
586 }
587
588 y2 = rtsc_x2y(rtsc, x + isc->dx);
589 if (y2 >= y + isc->dy) {
590 /* rtsc is above isc, replace rtsc by isc */
591 rtsc->x = x;
592 rtsc->y = y;
593 rtsc->dx = isc->dx;
594 rtsc->dy = isc->dy;
595 return;
596 }
597
598 /*
599 * the two curves intersect
600 * compute the offsets (dx, dy) using the reverse
601 * function of seg_x2y()
602 * seg_x2y(dx, sm1) == seg_x2y(dx, sm2) + (y1 - y)
603 */
604 dx = (y1 - y) << SM_SHIFT;
605 dsm = isc->sm1 - isc->sm2;
606 do_div(dx, dsm);
607 /*
608 * check if (x, y1) belongs to the 1st segment of rtsc.
609 * if so, add the offset.
610 */
611 if (rtsc->x + rtsc->dx > x)
612 dx += rtsc->x + rtsc->dx - x;
613 dy = seg_x2y(dx, isc->sm1);
614
615 rtsc->x = x;
616 rtsc->y = y;
617 rtsc->dx = dx;
618 rtsc->dy = dy;
619 return;
620}
621
622static void
623init_ed(struct hfsc_class *cl, unsigned int next_len)
624{
3bebcda2 625 u64 cur_time = psched_get_time();
1da177e4
LT		 626
627 /* update the deadline curve */
628 rtsc_min(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul);
629
630 /*
631 * update the eligible curve.
632 * for concave, it is equal to the deadline curve.
633 * for convex, it is a linear curve with slope m2.
634 */
635 cl->cl_eligible = cl->cl_deadline;
636 if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) {
637 cl->cl_eligible.dx = 0;
638 cl->cl_eligible.dy = 0;
639 }
640
641 /* compute e and d */
642 cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul);
643 cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len);
644
645 eltree_insert(cl);
646}
647
648static void
649update_ed(struct hfsc_class *cl, unsigned int next_len)
650{
651 cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul);
652 cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len);
653
654 eltree_update(cl);
655}
656
657static inline void
658update_d(struct hfsc_class *cl, unsigned int next_len)
659{
660 cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len);
661}
662
663static inline void
664update_cfmin(struct hfsc_class *cl)
665{
666 struct rb_node *n = rb_first(&cl->cf_tree);
667 struct hfsc_class *p;
668
669 if (n == NULL) {
670 cl->cl_cfmin = 0;
671 return;
672 }
673 p = rb_entry(n, struct hfsc_class, cf_node);
674 cl->cl_cfmin = p->cl_f;
675}
676
677static void
678init_vf(struct hfsc_class *cl, unsigned int len)
679{
680 struct hfsc_class *max_cl;
681 struct rb_node *n;
682 u64 vt, f, cur_time;
683 int go_active;
684
685 cur_time = 0;
686 go_active = 1;
687 for (; cl->cl_parent != NULL; cl = cl->cl_parent) {
688 if (go_active && cl->cl_nactive++ == 0)
689 go_active = 1;
690 else
691 go_active = 0;
692
693 if (go_active) {
694 n = rb_last(&cl->cl_parent->vt_tree);
695 if (n != NULL) {
696 max_cl = rb_entry(n, struct hfsc_class,vt_node);
697 /*
698 * set vt to the average of the min and max
699 * classes. if the parent's period didn't
700 * change, don't decrease vt of the class.
701 */
702 vt = max_cl->cl_vt;
703 if (cl->cl_parent->cl_cvtmin != 0)
704 vt = (cl->cl_parent->cl_cvtmin + vt)/2;
705
706 if (cl->cl_parent->cl_vtperiod !=
707 cl->cl_parentperiod || vt > cl->cl_vt)
708 cl->cl_vt = vt;
709 } else {
710 /*
711 * first child for a new parent backlog period.
712 * add parent's cvtmax to cvtoff to make a new
713 * vt (vtoff + vt) larger than the vt in the
714 * last period for all children.
715 */
716 vt = cl->cl_parent->cl_cvtmax;
717 cl->cl_parent->cl_cvtoff += vt;
718 cl->cl_parent->cl_cvtmax = 0;
719 cl->cl_parent->cl_cvtmin = 0;
720 cl->cl_vt = 0;
721 }
722
723 cl->cl_vtoff = cl->cl_parent->cl_cvtoff -
724 cl->cl_pcvtoff;
725
726 /* update the virtual curve */
727 vt = cl->cl_vt + cl->cl_vtoff;
728 rtsc_min(&cl->cl_virtual, &cl->cl_fsc, vt,
10297b99 729 cl->cl_total);
1da177e4
LT		 730 if (cl->cl_virtual.x == vt) {
731 cl->cl_virtual.x -= cl->cl_vtoff;
732 cl->cl_vtoff = 0;
733 }
734 cl->cl_vtadj = 0;
735
736 cl->cl_vtperiod++; /* increment vt period */
737 cl->cl_parentperiod = cl->cl_parent->cl_vtperiod;
738 if (cl->cl_parent->cl_nactive == 0)
739 cl->cl_parentperiod++;
740 cl->cl_f = 0;
741
742 vttree_insert(cl);
743 cftree_insert(cl);
744
745 if (cl->cl_flags & HFSC_USC) {
746 /* class has upper limit curve */
747 if (cur_time == 0)
3bebcda2 748 cur_time = psched_get_time();
1da177e4
LT		 749
750 /* update the ulimit curve */
751 rtsc_min(&cl->cl_ulimit, &cl->cl_usc, cur_time,
10297b99 752 cl->cl_total);
1da177e4
LT		 753 /* compute myf */
754 cl->cl_myf = rtsc_y2x(&cl->cl_ulimit,
10297b99 755 cl->cl_total);
1da177e4
LT		 756 cl->cl_myfadj = 0;
757 }
758 }
759
760 f = max(cl->cl_myf, cl->cl_cfmin);
761 if (f != cl->cl_f) {
762 cl->cl_f = f;
763 cftree_update(cl);
764 update_cfmin(cl->cl_parent);
765 }
766 }
767}
768
769static void
770update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time)
771{
772 u64 f; /* , myf_bound, delta; */
773 int go_passive = 0;
774
775 if (cl->qdisc->q.qlen == 0 && cl->cl_flags & HFSC_FSC)
776 go_passive = 1;
777
778 for (; cl->cl_parent != NULL; cl = cl->cl_parent) {
779 cl->cl_total += len;
780
781 if (!(cl->cl_flags & HFSC_FSC) || cl->cl_nactive == 0)
782 continue;
783
784 if (go_passive && --cl->cl_nactive == 0)
785 go_passive = 1;
786 else
787 go_passive = 0;
788
789 if (go_passive) {
790 /* no more active child, going passive */
791
792 /* update cvtmax of the parent class */
793 if (cl->cl_vt > cl->cl_parent->cl_cvtmax)
794 cl->cl_parent->cl_cvtmax = cl->cl_vt;
795
796 /* remove this class from the vt tree */
797 vttree_remove(cl);
798
799 cftree_remove(cl);
800 update_cfmin(cl->cl_parent);
801
802 continue;
803 }
804
805 /*
806 * update vt and f
807 */
808 cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total)
10297b99 809 - cl->cl_vtoff + cl->cl_vtadj;
1da177e4
LT		 810
811 /*
812 * if vt of the class is smaller than cvtmin,
813 * the class was skipped in the past due to non-fit.
814 * if so, we need to adjust vtadj.
815 */
816 if (cl->cl_vt < cl->cl_parent->cl_cvtmin) {
817 cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt;
818 cl->cl_vt = cl->cl_parent->cl_cvtmin;
819 }
820
821 /* update the vt tree */
822 vttree_update(cl);
823
824 if (cl->cl_flags & HFSC_USC) {
825 cl->cl_myf = cl->cl_myfadj + rtsc_y2x(&cl->cl_ulimit,
10297b99 826 cl->cl_total);
1da177e4
LT		 827#if 0
828 /*
829 * This code causes classes to stay way under their
830 * limit when multiple classes are used at gigabit
831 * speed. needs investigation. -kaber
832 */
833 /*
834 * if myf lags behind by more than one clock tick
835 * from the current time, adjust myfadj to prevent
836 * a rate-limited class from going greedy.
837 * in a steady state under rate-limiting, myf
838 * fluctuates within one clock tick.
839 */
840 myf_bound = cur_time - PSCHED_JIFFIE2US(1);
841 if (cl->cl_myf < myf_bound) {
842 delta = cur_time - cl->cl_myf;
843 cl->cl_myfadj += delta;
844 cl->cl_myf += delta;
845 }
846#endif
847 }
848
849 f = max(cl->cl_myf, cl->cl_cfmin);
850 if (f != cl->cl_f) {
851 cl->cl_f = f;
852 cftree_update(cl);
853 update_cfmin(cl->cl_parent);
854 }
855 }
856}
857
858static void
859set_active(struct hfsc_class *cl, unsigned int len)
860{
861 if (cl->cl_flags & HFSC_RSC)
862 init_ed(cl, len);
863 if (cl->cl_flags & HFSC_FSC)
864 init_vf(cl, len);
865
866 list_add_tail(&cl->dlist, &cl->sched->droplist);
867}
868
869static void
870set_passive(struct hfsc_class *cl)
871{
872 if (cl->cl_flags & HFSC_RSC)
873 eltree_remove(cl);
874
875 list_del(&cl->dlist);
876
877 /*
878 * vttree is now handled in update_vf() so that update_vf(cl, 0, 0)
879 * needs to be called explicitly to remove a class from vttree.
880 */
881}
882
883/*
884 * hack to get length of first packet in queue.
885 */
886static unsigned int
887qdisc_peek_len(struct Qdisc *sch)
888{
889 struct sk_buff *skb;
890 unsigned int len;
891
892 skb = sch->dequeue(sch);
893 if (skb == NULL) {
894 if (net_ratelimit())
895 printk("qdisc_peek_len: non work-conserving qdisc ?\n");
896 return 0;
897 }
898 len = skb->len;
899 if (unlikely(sch->ops->requeue(skb, sch) != NET_XMIT_SUCCESS)) {
900 if (net_ratelimit())
901 printk("qdisc_peek_len: failed to requeue\n");
e488eafc 902 qdisc_tree_decrease_qlen(sch, 1);
1da177e4
LT		 903 return 0;
904 }
905 return len;
906}
907
908static void
909hfsc_purge_queue(struct Qdisc *sch, struct hfsc_class *cl)
910{
911 unsigned int len = cl->qdisc->q.qlen;
912
913 qdisc_reset(cl->qdisc);
f973b913 914 qdisc_tree_decrease_qlen(cl->qdisc, len);
1da177e4
LT		 915}
916
917static void
918hfsc_adjust_levels(struct hfsc_class *cl)
919{
920 struct hfsc_class *p;
921 unsigned int level;
922
923 do {
924 level = 0;
925 list_for_each_entry(p, &cl->children, siblings) {
210525d6
PM		 926 if (p->level >= level)
927 level = p->level + 1;
1da177e4 928 }
210525d6 929 cl->level = level;
1da177e4
LT		 930 } while ((cl = cl->cl_parent) != NULL);
931}
932
1da177e4
LT		 933static inline struct hfsc_class *
934hfsc_find_class(u32 classid, struct Qdisc *sch)
935{
936 struct hfsc_sched *q = qdisc_priv(sch);
be0d39d5 937 struct Qdisc_class_common *clc;
1da177e4 938
be0d39d5
PM		 939 clc = qdisc_class_find(&q->clhash, classid);
940 if (clc == NULL)
941 return NULL;
942 return container_of(clc, struct hfsc_class, cl_common);
1da177e4
LT		 943}
944
945static void
946hfsc_change_rsc(struct hfsc_class *cl, struct tc_service_curve *rsc,
10297b99 947 u64 cur_time)
1da177e4
LT		 948{
949 sc2isc(rsc, &cl->cl_rsc);
950 rtsc_init(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul);
951 cl->cl_eligible = cl->cl_deadline;
952 if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) {
953 cl->cl_eligible.dx = 0;
954 cl->cl_eligible.dy = 0;
955 }
956 cl->cl_flags |= HFSC_RSC;
957}
958
959static void
960hfsc_change_fsc(struct hfsc_class *cl, struct tc_service_curve *fsc)
961{
962 sc2isc(fsc, &cl->cl_fsc);
963 rtsc_init(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total);
964 cl->cl_flags |= HFSC_FSC;
965}
966
967static void
968hfsc_change_usc(struct hfsc_class *cl, struct tc_service_curve *usc,
10297b99 969 u64 cur_time)
1da177e4
LT		 970{
971 sc2isc(usc, &cl->cl_usc);
972 rtsc_init(&cl->cl_ulimit, &cl->cl_usc, cur_time, cl->cl_total);
973 cl->cl_flags |= HFSC_USC;
974}
975
27a3421e
PM		 976static const struct nla_policy hfsc_policy[TCA_HFSC_MAX + 1] = {
977 [TCA_HFSC_RSC] = { .len = sizeof(struct tc_service_curve) },
978 [TCA_HFSC_FSC] = { .len = sizeof(struct tc_service_curve) },
979 [TCA_HFSC_USC] = { .len = sizeof(struct tc_service_curve) },
980};
981
1da177e4
LT		 982static int
983hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
1e90474c 984 struct nlattr **tca, unsigned long *arg)
1da177e4
LT		 985{
986 struct hfsc_sched *q = qdisc_priv(sch);
987 struct hfsc_class *cl = (struct hfsc_class *)*arg;
988 struct hfsc_class *parent = NULL;
1e90474c
PM		 989 struct nlattr *opt = tca[TCA_OPTIONS];
990 struct nlattr *tb[TCA_HFSC_MAX + 1];
1da177e4
LT		 991 struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL;
992 u64 cur_time;
cee63723 993 int err;
1da177e4 994
cee63723 995 if (opt == NULL)
1da177e4
LT		 996 return -EINVAL;
997
27a3421e 998 err = nla_parse_nested(tb, TCA_HFSC_MAX, opt, hfsc_policy);
cee63723
PM		 999 if (err < 0)
1000 return err;
1001
1e90474c 1002 if (tb[TCA_HFSC_RSC]) {
1e90474c 1003 rsc = nla_data(tb[TCA_HFSC_RSC]);
1da177e4
LT		 1004 if (rsc->m1 == 0 && rsc->m2 == 0)
1005 rsc = NULL;
1006 }
1007
1e90474c 1008 if (tb[TCA_HFSC_FSC]) {
1e90474c 1009 fsc = nla_data(tb[TCA_HFSC_FSC]);
1da177e4
LT		 1010 if (fsc->m1 == 0 && fsc->m2 == 0)
1011 fsc = NULL;
1012 }
1013
1e90474c 1014 if (tb[TCA_HFSC_USC]) {
1e90474c 1015 usc = nla_data(tb[TCA_HFSC_USC]);
1da177e4
LT		 1016 if (usc->m1 == 0 && usc->m2 == 0)
1017 usc = NULL;
1018 }
1019
1020 if (cl != NULL) {
1021 if (parentid) {
be0d39d5
PM		 1022 if (cl->cl_parent &&
1023 cl->cl_parent->cl_common.classid != parentid)
1da177e4
LT		 1024 return -EINVAL;
1025 if (cl->cl_parent == NULL && parentid != TC_H_ROOT)
1026 return -EINVAL;
1027 }
3bebcda2 1028 cur_time = psched_get_time();
1da177e4
LT		 1029
1030 sch_tree_lock(sch);
1031 if (rsc != NULL)
1032 hfsc_change_rsc(cl, rsc, cur_time);
1033 if (fsc != NULL)
1034 hfsc_change_fsc(cl, fsc);
1035 if (usc != NULL)
1036 hfsc_change_usc(cl, usc, cur_time);
1037
1038 if (cl->qdisc->q.qlen != 0) {
1039 if (cl->cl_flags & HFSC_RSC)
1040 update_ed(cl, qdisc_peek_len(cl->qdisc));
1041 if (cl->cl_flags & HFSC_FSC)
1042 update_vf(cl, 0, cur_time);
1043 }
1044 sch_tree_unlock(sch);
1045
1e90474c 1046 if (tca[TCA_RATE])
1da177e4 1047 gen_replace_estimator(&cl->bstats, &cl->rate_est,
4bdf3991 1048 &sch->dev->queue_lock,
1e90474c 1049 tca[TCA_RATE]);
1da177e4
LT		 1050 return 0;
1051 }
1052
1053 if (parentid == TC_H_ROOT)
1054 return -EEXIST;
1055
1056 parent = &q->root;
1057 if (parentid) {
1058 parent = hfsc_find_class(parentid, sch);
1059 if (parent == NULL)
1060 return -ENOENT;
1061 }
1062
1063 if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0)
1064 return -EINVAL;
1065 if (hfsc_find_class(classid, sch))
1066 return -EEXIST;
1067
1068 if (rsc == NULL && fsc == NULL)
1069 return -EINVAL;
1070
0da974f4 1071 cl = kzalloc(sizeof(struct hfsc_class), GFP_KERNEL);
1da177e4
LT		 1072 if (cl == NULL)
1073 return -ENOBUFS;
1da177e4
LT		 1074
1075 if (rsc != NULL)
1076 hfsc_change_rsc(cl, rsc, 0);
1077 if (fsc != NULL)
1078 hfsc_change_fsc(cl, fsc);
1079 if (usc != NULL)
1080 hfsc_change_usc(cl, usc, 0);
1081
be0d39d5 1082 cl->cl_common.classid = classid;
1da177e4 1083 cl->refcnt = 1;
1da177e4
LT		 1084 cl->sched = q;
1085 cl->cl_parent = parent;
9f9afec4 1086 cl->qdisc = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid);
1da177e4
LT		 1087 if (cl->qdisc == NULL)
1088 cl->qdisc = &noop_qdisc;
1da177e4
LT		 1089 INIT_LIST_HEAD(&cl->children);
1090 cl->vt_tree = RB_ROOT;
1091 cl->cf_tree = RB_ROOT;
1092
1093 sch_tree_lock(sch);
be0d39d5 1094 qdisc_class_hash_insert(&q->clhash, &cl->cl_common);
1da177e4
LT		 1095 list_add_tail(&cl->siblings, &parent->children);
1096 if (parent->level == 0)
1097 hfsc_purge_queue(sch, parent);
1098 hfsc_adjust_levels(parent);
1099 cl->cl_pcvtoff = parent->cl_cvtoff;
1100 sch_tree_unlock(sch);
1101
be0d39d5
PM		 1102 qdisc_class_hash_grow(sch, &q->clhash);
1103
1e90474c 1104 if (tca[TCA_RATE])
1da177e4 1105 gen_new_estimator(&cl->bstats, &cl->rate_est,
1e90474c 1106 &sch->dev->queue_lock, tca[TCA_RATE]);
1da177e4
LT		 1107 *arg = (unsigned long)cl;
1108 return 0;
1109}
1110
1da177e4
LT		 1111static void
1112hfsc_destroy_class(struct Qdisc *sch, struct hfsc_class *cl)
1113{
1114 struct hfsc_sched *q = qdisc_priv(sch);
1115
ff31ab56 1116 tcf_destroy_chain(&cl->filter_list);
1da177e4 1117 qdisc_destroy(cl->qdisc);
1da177e4 1118 gen_kill_estimator(&cl->bstats, &cl->rate_est);
1da177e4
LT		 1119 if (cl != &q->root)
1120 kfree(cl);
1121}
1122
1123static int
1124hfsc_delete_class(struct Qdisc *sch, unsigned long arg)
1125{
1126 struct hfsc_sched *q = qdisc_priv(sch);
1127 struct hfsc_class *cl = (struct hfsc_class *)arg;
1128
1129 if (cl->level > 0 || cl->filter_cnt > 0 || cl == &q->root)
1130 return -EBUSY;
1131
1132 sch_tree_lock(sch);
1133
1da177e4
LT		 1134 list_del(&cl->siblings);
1135 hfsc_adjust_levels(cl->cl_parent);
c38c83cb 1136
1da177e4 1137 hfsc_purge_queue(sch, cl);
be0d39d5 1138 qdisc_class_hash_remove(&q->clhash, &cl->cl_common);
c38c83cb 1139
1da177e4
LT		 1140 if (--cl->refcnt == 0)
1141 hfsc_destroy_class(sch, cl);
1142
1143 sch_tree_unlock(sch);
1144 return 0;
1145}
1146
1147static struct hfsc_class *
1148hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr)
1149{
1150 struct hfsc_sched *q = qdisc_priv(sch);
1151 struct hfsc_class *cl;
1152 struct tcf_result res;
1153 struct tcf_proto *tcf;
1154 int result;
1155
1156 if (TC_H_MAJ(skb->priority ^ sch->handle) == 0 &&
1157 (cl = hfsc_find_class(skb->priority, sch)) != NULL)
1158 if (cl->level == 0)
1159 return cl;
1160
29f1df6c 1161 *qerr = NET_XMIT_BYPASS;
1da177e4
LT		 1162 tcf = q->root.filter_list;
1163 while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
1164#ifdef CONFIG_NET_CLS_ACT
1165 switch (result) {
1166 case TC_ACT_QUEUED:
10297b99 1167 case TC_ACT_STOLEN:
1da177e4 1168 *qerr = NET_XMIT_SUCCESS;
10297b99 1169 case TC_ACT_SHOT:
1da177e4
LT		 1170 return NULL;
1171 }
1da177e4
LT		 1172#endif
1173 if ((cl = (struct hfsc_class *)res.class) == NULL) {
1174 if ((cl = hfsc_find_class(res.classid, sch)) == NULL)
1175 break; /* filter selected invalid classid */
1176 }
1177
1178 if (cl->level == 0)
1179 return cl; /* hit leaf class */
1180
1181 /* apply inner filter chain */
1182 tcf = cl->filter_list;
1183 }
1184
1185 /* classification failed, try default class */
1186 cl = hfsc_find_class(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch);
1187 if (cl == NULL || cl->level > 0)
1188 return NULL;
1189
1190 return cl;
1191}
1192
1193static int
1194hfsc_graft_class(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
10297b99 1195 struct Qdisc **old)
1da177e4
LT		 1196{
1197 struct hfsc_class *cl = (struct hfsc_class *)arg;
1198
1199 if (cl == NULL)
1200 return -ENOENT;
1201 if (cl->level > 0)
1202 return -EINVAL;
1203 if (new == NULL) {
9f9afec4 1204 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
be0d39d5 1205 cl->cl_common.classid);
1da177e4
LT		 1206 if (new == NULL)
1207 new = &noop_qdisc;
1208 }
1209
1210 sch_tree_lock(sch);
1211 hfsc_purge_queue(sch, cl);
1212 *old = xchg(&cl->qdisc, new);
1213 sch_tree_unlock(sch);
1214 return 0;
1215}
1216
1217static struct Qdisc *
1218hfsc_class_leaf(struct Qdisc *sch, unsigned long arg)
1219{
1220 struct hfsc_class *cl = (struct hfsc_class *)arg;
1221
1222 if (cl != NULL && cl->level == 0)
1223 return cl->qdisc;
1224
1225 return NULL;
1226}
1227
f973b913
PM		 1228static void
1229hfsc_qlen_notify(struct Qdisc *sch, unsigned long arg)
1230{
1231 struct hfsc_class *cl = (struct hfsc_class *)arg;
1232
1233 if (cl->qdisc->q.qlen == 0) {
1234 update_vf(cl, 0, 0);
1235 set_passive(cl);
1236 }
1237}
1238
1da177e4
LT		 1239static unsigned long
1240hfsc_get_class(struct Qdisc *sch, u32 classid)
1241{
1242 struct hfsc_class *cl = hfsc_find_class(classid, sch);
1243
1244 if (cl != NULL)
1245 cl->refcnt++;
1246
1247 return (unsigned long)cl;
1248}
1249
1250static void
1251hfsc_put_class(struct Qdisc *sch, unsigned long arg)
1252{
1253 struct hfsc_class *cl = (struct hfsc_class *)arg;
1254
1255 if (--cl->refcnt == 0)
1256 hfsc_destroy_class(sch, cl);
1257}
1258
1259static unsigned long
1260hfsc_bind_tcf(struct Qdisc *sch, unsigned long parent, u32 classid)
1261{
1262 struct hfsc_class *p = (struct hfsc_class *)parent;
1263 struct hfsc_class *cl = hfsc_find_class(classid, sch);
1264
1265 if (cl != NULL) {
1266 if (p != NULL && p->level <= cl->level)
1267 return 0;
1268 cl->filter_cnt++;
1269 }
1270
1271 return (unsigned long)cl;
1272}
1273
1274static void
1275hfsc_unbind_tcf(struct Qdisc *sch, unsigned long arg)
1276{
1277 struct hfsc_class *cl = (struct hfsc_class *)arg;
1278
1279 cl->filter_cnt--;
1280}
1281
1282static struct tcf_proto **
1283hfsc_tcf_chain(struct Qdisc *sch, unsigned long arg)
1284{
1285 struct hfsc_sched *q = qdisc_priv(sch);
1286 struct hfsc_class *cl = (struct hfsc_class *)arg;
1287
1288 if (cl == NULL)
1289 cl = &q->root;
1290
1291 return &cl->filter_list;
1292}
1293
1294static int
1295hfsc_dump_sc(struct sk_buff *skb, int attr, struct internal_sc *sc)
1296{
1297 struct tc_service_curve tsc;
1298
1299 tsc.m1 = sm2m(sc->sm1);
1300 tsc.d = dx2d(sc->dx);
1301 tsc.m2 = sm2m(sc->sm2);
1e90474c 1302 NLA_PUT(skb, attr, sizeof(tsc), &tsc);
1da177e4
LT		 1303
1304 return skb->len;
1305
1e90474c 1306 nla_put_failure:
1da177e4
LT		 1307 return -1;
1308}
1309
1310static inline int
1311hfsc_dump_curves(struct sk_buff *skb, struct hfsc_class *cl)
1312{
1313 if ((cl->cl_flags & HFSC_RSC) &&
1314 (hfsc_dump_sc(skb, TCA_HFSC_RSC, &cl->cl_rsc) < 0))
1e90474c 1315 goto nla_put_failure;
1da177e4
LT		 1316
1317 if ((cl->cl_flags & HFSC_FSC) &&
1318 (hfsc_dump_sc(skb, TCA_HFSC_FSC, &cl->cl_fsc) < 0))
1e90474c 1319 goto nla_put_failure;
1da177e4
LT		 1320
1321 if ((cl->cl_flags & HFSC_USC) &&
1322 (hfsc_dump_sc(skb, TCA_HFSC_USC, &cl->cl_usc) < 0))
1e90474c 1323 goto nla_put_failure;
1da177e4
LT		 1324
1325 return skb->len;
1326
1e90474c 1327 nla_put_failure:
1da177e4
LT		 1328 return -1;
1329}
1330
1331static int
1332hfsc_dump_class(struct Qdisc *sch, unsigned long arg, struct sk_buff *skb,
10297b99 1333 struct tcmsg *tcm)
1da177e4
LT		 1334{
1335 struct hfsc_class *cl = (struct hfsc_class *)arg;
4b3550ef 1336 struct nlattr *nest;
1da177e4 1337
be0d39d5
PM		 1338 tcm->tcm_parent = cl->cl_parent ? cl->cl_parent->cl_common.classid :
1339 TC_H_ROOT;
1340 tcm->tcm_handle = cl->cl_common.classid;
1da177e4
LT		 1341 if (cl->level == 0)
1342 tcm->tcm_info = cl->qdisc->handle;
1343
4b3550ef
PM		 1344 nest = nla_nest_start(skb, TCA_OPTIONS);
1345 if (nest == NULL)
1346 goto nla_put_failure;
1da177e4 1347 if (hfsc_dump_curves(skb, cl) < 0)
1e90474c 1348 goto nla_put_failure;
4b3550ef 1349 nla_nest_end(skb, nest);
1da177e4
LT		 1350 return skb->len;
1351
1e90474c 1352 nla_put_failure:
4b3550ef 1353 nla_nest_cancel(skb, nest);
bc3ed28c 1354 return -EMSGSIZE;
1da177e4
LT		 1355}
1356
1357static int
1358hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
1359 struct gnet_dump *d)
1360{
1361 struct hfsc_class *cl = (struct hfsc_class *)arg;
1362 struct tc_hfsc_stats xstats;
1363
1364 cl->qstats.qlen = cl->qdisc->q.qlen;
1365 xstats.level = cl->level;
1366 xstats.period = cl->cl_vtperiod;
1367 xstats.work = cl->cl_total;
1368 xstats.rtwork = cl->cl_cumul;
1369
1370 if (gnet_stats_copy_basic(d, &cl->bstats) < 0 ||
1da177e4 1371 gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 ||
1da177e4
LT		 1372 gnet_stats_copy_queue(d, &cl->qstats) < 0)
1373 return -1;
1374
1375 return gnet_stats_copy_app(d, &xstats, sizeof(xstats));
1376}
1377
1378
1379
1380static void
1381hfsc_walk(struct Qdisc *sch, struct qdisc_walker *arg)
1382{
1383 struct hfsc_sched *q = qdisc_priv(sch);
be0d39d5 1384 struct hlist_node *n;
1da177e4
LT		 1385 struct hfsc_class *cl;
1386 unsigned int i;
1387
1388 if (arg->stop)
1389 return;
1390
be0d39d5
PM		 1391 for (i = 0; i < q->clhash.hashsize; i++) {
1392 hlist_for_each_entry(cl, n, &q->clhash.hash[i],
1393 cl_common.hnode) {
1da177e4
LT		 1394 if (arg->count < arg->skip) {
1395 arg->count++;
1396 continue;
1397 }
1398 if (arg->fn(sch, (unsigned long)cl, arg) < 0) {
1399 arg->stop = 1;
1400 return;
1401 }
1402 arg->count++;
1403 }
1404 }
1405}
1406
1407static void
ed2b229a 1408hfsc_schedule_watchdog(struct Qdisc *sch)
1da177e4
LT		 1409{
1410 struct hfsc_sched *q = qdisc_priv(sch);
1411 struct hfsc_class *cl;
1412 u64 next_time = 0;
1da177e4
LT		 1413
1414 if ((cl = eltree_get_minel(q)) != NULL)
1415 next_time = cl->cl_e;
1416 if (q->root.cl_cfmin != 0) {
1417 if (next_time == 0 || next_time > q->root.cl_cfmin)
1418 next_time = q->root.cl_cfmin;
1419 }
3d50f231 1420 WARN_ON(next_time == 0);
ed2b229a 1421 qdisc_watchdog_schedule(&q->watchdog, next_time);
1da177e4
LT		 1422}
1423
1424static int
1e90474c 1425hfsc_init_qdisc(struct Qdisc *sch, struct nlattr *opt)
1da177e4
LT		 1426{
1427 struct hfsc_sched *q = qdisc_priv(sch);
1428 struct tc_hfsc_qopt *qopt;
be0d39d5 1429 int err;
1da177e4 1430
1e90474c 1431 if (opt == NULL || nla_len(opt) < sizeof(*qopt))
1da177e4 1432 return -EINVAL;
1e90474c 1433 qopt = nla_data(opt);
1da177e4 1434
1da177e4 1435 q->defcls = qopt->defcls;
be0d39d5
PM		 1436 err = qdisc_class_hash_init(&q->clhash);
1437 if (err < 0)
1438 return err;
1da177e4
LT		 1439 q->eligible = RB_ROOT;
1440 INIT_LIST_HEAD(&q->droplist);
1441 skb_queue_head_init(&q->requeue);
1442
be0d39d5 1443 q->root.cl_common.classid = sch->handle;
1da177e4 1444 q->root.refcnt = 1;
1da177e4 1445 q->root.sched = q;
9f9afec4
PM		 1446 q->root.qdisc = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
1447 sch->handle);
1da177e4
LT		 1448 if (q->root.qdisc == NULL)
1449 q->root.qdisc = &noop_qdisc;
1da177e4
LT		 1450 INIT_LIST_HEAD(&q->root.children);
1451 q->root.vt_tree = RB_ROOT;
1452 q->root.cf_tree = RB_ROOT;
1453
be0d39d5
PM		 1454 qdisc_class_hash_insert(&q->clhash, &q->root.cl_common);
1455 qdisc_class_hash_grow(sch, &q->clhash);
1da177e4 1456
ed2b229a 1457 qdisc_watchdog_init(&q->watchdog, sch);
1da177e4
LT		 1458
1459 return 0;
1460}
1461
1462static int
1e90474c 1463hfsc_change_qdisc(struct Qdisc *sch, struct nlattr *opt)
1da177e4
LT		 1464{
1465 struct hfsc_sched *q = qdisc_priv(sch);
1466 struct tc_hfsc_qopt *qopt;
1467
1e90474c 1468 if (opt == NULL || nla_len(opt) < sizeof(*qopt))
1da177e4 1469 return -EINVAL;
1e90474c 1470 qopt = nla_data(opt);
1da177e4
LT		 1471
1472 sch_tree_lock(sch);
1473 q->defcls = qopt->defcls;
1474 sch_tree_unlock(sch);
1475
1476 return 0;
1477}
1478
1479static void
1480hfsc_reset_class(struct hfsc_class *cl)
1481{
1482 cl->cl_total = 0;
1483 cl->cl_cumul = 0;
1484 cl->cl_d = 0;
1485 cl->cl_e = 0;
1486 cl->cl_vt = 0;
1487 cl->cl_vtadj = 0;
1488 cl->cl_vtoff = 0;
1489 cl->cl_cvtmin = 0;
1490 cl->cl_cvtmax = 0;
1491 cl->cl_cvtoff = 0;
1492 cl->cl_pcvtoff = 0;
1493 cl->cl_vtperiod = 0;
1494 cl->cl_parentperiod = 0;
1495 cl->cl_f = 0;
1496 cl->cl_myf = 0;
1497 cl->cl_myfadj = 0;
1498 cl->cl_cfmin = 0;
1499 cl->cl_nactive = 0;
1500
1501 cl->vt_tree = RB_ROOT;
1502 cl->cf_tree = RB_ROOT;
1503 qdisc_reset(cl->qdisc);
1504
1505 if (cl->cl_flags & HFSC_RSC)
1506 rtsc_init(&cl->cl_deadline, &cl->cl_rsc, 0, 0);
1507 if (cl->cl_flags & HFSC_FSC)
1508 rtsc_init(&cl->cl_virtual, &cl->cl_fsc, 0, 0);
1509 if (cl->cl_flags & HFSC_USC)
1510 rtsc_init(&cl->cl_ulimit, &cl->cl_usc, 0, 0);
1511}
1512
1513static void
1514hfsc_reset_qdisc(struct Qdisc *sch)
1515{
1516 struct hfsc_sched *q = qdisc_priv(sch);
1517 struct hfsc_class *cl;
be0d39d5 1518 struct hlist_node *n;
1da177e4
LT		 1519 unsigned int i;
1520
be0d39d5
PM		 1521 for (i = 0; i < q->clhash.hashsize; i++) {
1522 hlist_for_each_entry(cl, n, &q->clhash.hash[i], cl_common.hnode)
1da177e4
LT		 1523 hfsc_reset_class(cl);
1524 }
1525 __skb_queue_purge(&q->requeue);
1526 q->eligible = RB_ROOT;
1527 INIT_LIST_HEAD(&q->droplist);
ed2b229a 1528 qdisc_watchdog_cancel(&q->watchdog);
1da177e4
LT		 1529 sch->q.qlen = 0;
1530}
1531
1532static void
1533hfsc_destroy_qdisc(struct Qdisc *sch)
1534{
1535 struct hfsc_sched *q = qdisc_priv(sch);
be0d39d5
PM		 1536 struct hlist_node *n, *next;
1537 struct hfsc_class *cl;
1da177e4
LT		 1538 unsigned int i;
1539
be0d39d5
PM		 1540 for (i = 0; i < q->clhash.hashsize; i++) {
1541 hlist_for_each_entry(cl, n, &q->clhash.hash[i], cl_common.hnode)
a4aebb83
PM		 1542 tcf_destroy_chain(&cl->filter_list);
1543 }
be0d39d5
PM		 1544 for (i = 0; i < q->clhash.hashsize; i++) {
1545 hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i],
1546 cl_common.hnode)
1da177e4
LT		 1547 hfsc_destroy_class(sch, cl);
1548 }
be0d39d5 1549 qdisc_class_hash_destroy(&q->clhash);
1da177e4 1550 __skb_queue_purge(&q->requeue);
ed2b229a 1551 qdisc_watchdog_cancel(&q->watchdog);
1da177e4
LT		 1552}
1553
1554static int
1555hfsc_dump_qdisc(struct Qdisc *sch, struct sk_buff *skb)
1556{
1557 struct hfsc_sched *q = qdisc_priv(sch);
27a884dc 1558 unsigned char *b = skb_tail_pointer(skb);
1da177e4
LT		 1559 struct tc_hfsc_qopt qopt;
1560
1561 qopt.defcls = q->defcls;
1e90474c 1562 NLA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt);
1da177e4
LT		 1563 return skb->len;
1564
1e90474c 1565 nla_put_failure:
dc5fc579 1566 nlmsg_trim(skb, b);
1da177e4
LT		 1567 return -1;
1568}
1569
1570static int
1571hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
1572{
1573 struct hfsc_class *cl;
1574 unsigned int len;
1575 int err;
1576
1577 cl = hfsc_classify(skb, sch, &err);
1578 if (cl == NULL) {
29f1df6c 1579 if (err == NET_XMIT_BYPASS)
1da177e4
LT		 1580 sch->qstats.drops++;
1581 kfree_skb(skb);
1582 return err;
1583 }
1584
1585 len = skb->len;
1586 err = cl->qdisc->enqueue(skb, cl->qdisc);
1587 if (unlikely(err != NET_XMIT_SUCCESS)) {
1588 cl->qstats.drops++;
1589 sch->qstats.drops++;
1590 return err;
1591 }
1592
1593 if (cl->qdisc->q.qlen == 1)
1594 set_active(cl, len);
1595
1596 cl->bstats.packets++;
1597 cl->bstats.bytes += len;
1598 sch->bstats.packets++;
1599 sch->bstats.bytes += len;
1600 sch->q.qlen++;
1601
1602 return NET_XMIT_SUCCESS;
1603}
1604
1605static struct sk_buff *
1606hfsc_dequeue(struct Qdisc *sch)
1607{
1608 struct hfsc_sched *q = qdisc_priv(sch);
1609 struct hfsc_class *cl;
1610 struct sk_buff *skb;
1611 u64 cur_time;
1612 unsigned int next_len;
1613 int realtime = 0;
1614
1615 if (sch->q.qlen == 0)
1616 return NULL;
1617 if ((skb = __skb_dequeue(&q->requeue)))
1618 goto out;
1619
3bebcda2 1620 cur_time = psched_get_time();
1da177e4
LT		 1621
1622 /*
1623 * if there are eligible classes, use real-time criteria.
1624 * find the class with the minimum deadline among
1625 * the eligible classes.
1626 */
1627 if ((cl = eltree_get_mindl(q, cur_time)) != NULL) {
1628 realtime = 1;
1629 } else {
1630 /*
1631 * use link-sharing criteria
1632 * get the class with the minimum vt in the hierarchy
1633 */
1634 cl = vttree_get_minvt(&q->root, cur_time);
1635 if (cl == NULL) {
1636 sch->qstats.overlimits++;
ed2b229a 1637 hfsc_schedule_watchdog(sch);
1da177e4
LT		 1638 return NULL;
1639 }
1640 }
1641
1642 skb = cl->qdisc->dequeue(cl->qdisc);
1643 if (skb == NULL) {
1644 if (net_ratelimit())
1645 printk("HFSC: Non-work-conserving qdisc ?\n");
1646 return NULL;
1647 }
1648
1649 update_vf(cl, skb->len, cur_time);
1650 if (realtime)
1651 cl->cl_cumul += skb->len;
1652
1653 if (cl->qdisc->q.qlen != 0) {
1654 if (cl->cl_flags & HFSC_RSC) {
1655 /* update ed */
1656 next_len = qdisc_peek_len(cl->qdisc);
1657 if (realtime)
1658 update_ed(cl, next_len);
1659 else
1660 update_d(cl, next_len);
1661 }
1662 } else {
1663 /* the class becomes passive */
1664 set_passive(cl);
1665 }
1666
1667 out:
1668 sch->flags &= ~TCQ_F_THROTTLED;
1669 sch->q.qlen--;
1670
1671 return skb;
1672}
1673
1674static int
1675hfsc_requeue(struct sk_buff *skb, struct Qdisc *sch)
1676{
1677 struct hfsc_sched *q = qdisc_priv(sch);
1678
1679 __skb_queue_head(&q->requeue, skb);
1680 sch->q.qlen++;
1681 sch->qstats.requeues++;
1682 return NET_XMIT_SUCCESS;
1683}
1684
1685static unsigned int
1686hfsc_drop(struct Qdisc *sch)
1687{
1688 struct hfsc_sched *q = qdisc_priv(sch);
1689 struct hfsc_class *cl;
1690 unsigned int len;
1691
1692 list_for_each_entry(cl, &q->droplist, dlist) {
1693 if (cl->qdisc->ops->drop != NULL &&
1694 (len = cl->qdisc->ops->drop(cl->qdisc)) > 0) {
1695 if (cl->qdisc->q.qlen == 0) {
1696 update_vf(cl, 0, 0);
1697 set_passive(cl);
1698 } else {
1699 list_move_tail(&cl->dlist, &q->droplist);
1700 }
1701 cl->qstats.drops++;
1702 sch->qstats.drops++;
1703 sch->q.qlen--;
1704 return len;
1705 }
1706 }
1707 return 0;
1708}
1709
20fea08b 1710static const struct Qdisc_class_ops hfsc_class_ops = {
1da177e4
LT		 1711 .change = hfsc_change_class,
1712 .delete = hfsc_delete_class,
1713 .graft = hfsc_graft_class,
1714 .leaf = hfsc_class_leaf,
f973b913 1715 .qlen_notify = hfsc_qlen_notify,
1da177e4
LT		 1716 .get = hfsc_get_class,
1717 .put = hfsc_put_class,
1718 .bind_tcf = hfsc_bind_tcf,
1719 .unbind_tcf = hfsc_unbind_tcf,
1720 .tcf_chain = hfsc_tcf_chain,
1721 .dump = hfsc_dump_class,
1722 .dump_stats = hfsc_dump_class_stats,
1723 .walk = hfsc_walk
1724};
1725
20fea08b 1726static struct Qdisc_ops hfsc_qdisc_ops __read_mostly = {
1da177e4
LT		 1727 .id = "hfsc",
1728 .init = hfsc_init_qdisc,
1729 .change = hfsc_change_qdisc,
1730 .reset = hfsc_reset_qdisc,
1731 .destroy = hfsc_destroy_qdisc,
1732 .dump = hfsc_dump_qdisc,
1733 .enqueue = hfsc_enqueue,
1734 .dequeue = hfsc_dequeue,
1735 .requeue = hfsc_requeue,
1736 .drop = hfsc_drop,
1737 .cl_ops = &hfsc_class_ops,
1738 .priv_size = sizeof(struct hfsc_sched),
1739 .owner = THIS_MODULE
1740};
1741
1742static int __init
1743hfsc_init(void)
1744{
1745 return register_qdisc(&hfsc_qdisc_ops);
1746}
1747
1748static void __exit
1749hfsc_cleanup(void)
1750{
1751 unregister_qdisc(&hfsc_qdisc_ops);
1752}
1753
1754MODULE_LICENSE("GPL");
1755module_init(hfsc_init);
1756module_exit(hfsc_cleanup);
Linux kernel - Deliverables
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