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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> | |
56 | #include <linux/jiffies.h> | |
57 | #include <linux/compiler.h> | |
58 | #include <linux/spinlock.h> | |
59 | #include <linux/skbuff.h> | |
60 | #include <linux/string.h> | |
61 | #include <linux/slab.h> | |
1da177e4 LT |
62 | #include <linux/list.h> |
63 | #include <linux/rbtree.h> | |
64 | #include <linux/init.h> | |
65 | #include <linux/netdevice.h> | |
66 | #include <linux/rtnetlink.h> | |
67 | #include <linux/pkt_sched.h> | |
68 | #include <net/pkt_sched.h> | |
69 | #include <net/pkt_cls.h> | |
70 | #include <asm/system.h> | |
71 | #include <asm/div64.h> | |
72 | ||
1da177e4 LT |
73 | /* |
74 | * kernel internal service curve representation: | |
75 | * coordinates are given by 64 bit unsigned integers. | |
76 | * x-axis: unit is clock count. | |
77 | * y-axis: unit is byte. | |
78 | * | |
79 | * The service curve parameters are converted to the internal | |
80 | * representation. The slope values are scaled to avoid overflow. | |
81 | * the inverse slope values as well as the y-projection of the 1st | |
82 | * segment are kept in order to to avoid 64-bit divide operations | |
83 | * that are expensive on 32-bit architectures. | |
84 | */ | |
85 | ||
86 | struct internal_sc | |
87 | { | |
88 | u64 sm1; /* scaled slope of the 1st segment */ | |
89 | u64 ism1; /* scaled inverse-slope of the 1st segment */ | |
90 | u64 dx; /* the x-projection of the 1st segment */ | |
91 | u64 dy; /* the y-projection of the 1st segment */ | |
92 | u64 sm2; /* scaled slope of the 2nd segment */ | |
93 | u64 ism2; /* scaled inverse-slope of the 2nd segment */ | |
94 | }; | |
95 | ||
96 | /* runtime service curve */ | |
97 | struct runtime_sc | |
98 | { | |
99 | u64 x; /* current starting position on x-axis */ | |
100 | u64 y; /* current starting position on y-axis */ | |
101 | u64 sm1; /* scaled slope of the 1st segment */ | |
102 | u64 ism1; /* scaled inverse-slope of the 1st segment */ | |
103 | u64 dx; /* the x-projection of the 1st segment */ | |
104 | u64 dy; /* the y-projection of the 1st segment */ | |
105 | u64 sm2; /* scaled slope of the 2nd segment */ | |
106 | u64 ism2; /* scaled inverse-slope of the 2nd segment */ | |
107 | }; | |
108 | ||
109 | enum hfsc_class_flags | |
110 | { | |
111 | HFSC_RSC = 0x1, | |
112 | HFSC_FSC = 0x2, | |
113 | HFSC_USC = 0x4 | |
114 | }; | |
115 | ||
116 | struct hfsc_class | |
117 | { | |
118 | u32 classid; /* class id */ | |
119 | unsigned int refcnt; /* usage count */ | |
120 | ||
121 | struct gnet_stats_basic bstats; | |
122 | struct gnet_stats_queue qstats; | |
123 | struct gnet_stats_rate_est rate_est; | |
124 | spinlock_t *stats_lock; | |
125 | unsigned int level; /* class level in hierarchy */ | |
126 | struct tcf_proto *filter_list; /* filter list */ | |
127 | unsigned int filter_cnt; /* filter count */ | |
128 | ||
129 | struct hfsc_sched *sched; /* scheduler data */ | |
130 | struct hfsc_class *cl_parent; /* parent class */ | |
131 | struct list_head siblings; /* sibling classes */ | |
132 | struct list_head children; /* child classes */ | |
133 | struct Qdisc *qdisc; /* leaf qdisc */ | |
134 | ||
135 | struct rb_node el_node; /* qdisc's eligible tree member */ | |
136 | struct rb_root vt_tree; /* active children sorted by cl_vt */ | |
137 | struct rb_node vt_node; /* parent's vt_tree member */ | |
138 | struct rb_root cf_tree; /* active children sorted by cl_f */ | |
139 | struct rb_node cf_node; /* parent's cf_heap member */ | |
140 | struct list_head hlist; /* hash list member */ | |
141 | struct list_head dlist; /* drop list member */ | |
142 | ||
143 | u64 cl_total; /* total work in bytes */ | |
144 | u64 cl_cumul; /* cumulative work in bytes done by | |
145 | real-time criteria */ | |
146 | ||
147 | u64 cl_d; /* deadline*/ | |
148 | u64 cl_e; /* eligible time */ | |
149 | u64 cl_vt; /* virtual time */ | |
150 | u64 cl_f; /* time when this class will fit for | |
151 | link-sharing, max(myf, cfmin) */ | |
152 | u64 cl_myf; /* my fit-time (calculated from this | |
153 | class's own upperlimit curve) */ | |
154 | u64 cl_myfadj; /* my fit-time adjustment (to cancel | |
155 | history dependence) */ | |
156 | u64 cl_cfmin; /* earliest children's fit-time (used | |
157 | with cl_myf to obtain cl_f) */ | |
158 | u64 cl_cvtmin; /* minimal virtual time among the | |
159 | children fit for link-sharing | |
160 | (monotonic within a period) */ | |
161 | u64 cl_vtadj; /* intra-period cumulative vt | |
162 | adjustment */ | |
163 | u64 cl_vtoff; /* inter-period cumulative vt offset */ | |
164 | u64 cl_cvtmax; /* max child's vt in the last period */ | |
165 | u64 cl_cvtoff; /* cumulative cvtmax of all periods */ | |
166 | u64 cl_pcvtoff; /* parent's cvtoff at initalization | |
167 | time */ | |
168 | ||
169 | struct internal_sc cl_rsc; /* internal real-time service curve */ | |
170 | struct internal_sc cl_fsc; /* internal fair service curve */ | |
171 | struct internal_sc cl_usc; /* internal upperlimit service curve */ | |
172 | struct runtime_sc cl_deadline; /* deadline curve */ | |
173 | struct runtime_sc cl_eligible; /* eligible curve */ | |
174 | struct runtime_sc cl_virtual; /* virtual curve */ | |
175 | struct runtime_sc cl_ulimit; /* upperlimit curve */ | |
176 | ||
177 | unsigned long cl_flags; /* which curves are valid */ | |
178 | unsigned long cl_vtperiod; /* vt period sequence number */ | |
179 | unsigned long cl_parentperiod;/* parent's vt period sequence number*/ | |
180 | unsigned long cl_nactive; /* number of active children */ | |
181 | }; | |
182 | ||
183 | #define HFSC_HSIZE 16 | |
184 | ||
185 | struct hfsc_sched | |
186 | { | |
187 | u16 defcls; /* default class id */ | |
188 | struct hfsc_class root; /* root class */ | |
189 | struct list_head clhash[HFSC_HSIZE]; /* class hash */ | |
190 | struct rb_root eligible; /* eligible tree */ | |
191 | struct list_head droplist; /* active leaf class list (for | |
192 | dropping) */ | |
193 | struct sk_buff_head requeue; /* requeued packet */ | |
ed2b229a | 194 | struct qdisc_watchdog watchdog; /* watchdog timer */ |
1da177e4 LT |
195 | }; |
196 | ||
1da177e4 LT |
197 | #define HT_INFINITY 0xffffffffffffffffULL /* infinite time value */ |
198 | ||
199 | ||
200 | /* | |
201 | * eligible tree holds backlogged classes being sorted by their eligible times. | |
202 | * there is one eligible tree per hfsc instance. | |
203 | */ | |
204 | ||
205 | static void | |
206 | eltree_insert(struct hfsc_class *cl) | |
207 | { | |
208 | struct rb_node **p = &cl->sched->eligible.rb_node; | |
209 | struct rb_node *parent = NULL; | |
210 | struct hfsc_class *cl1; | |
211 | ||
212 | while (*p != NULL) { | |
213 | parent = *p; | |
214 | cl1 = rb_entry(parent, struct hfsc_class, el_node); | |
215 | if (cl->cl_e >= cl1->cl_e) | |
216 | p = &parent->rb_right; | |
217 | else | |
218 | p = &parent->rb_left; | |
219 | } | |
220 | rb_link_node(&cl->el_node, parent, p); | |
221 | rb_insert_color(&cl->el_node, &cl->sched->eligible); | |
222 | } | |
223 | ||
224 | static inline void | |
225 | eltree_remove(struct hfsc_class *cl) | |
226 | { | |
227 | rb_erase(&cl->el_node, &cl->sched->eligible); | |
228 | } | |
229 | ||
230 | static inline void | |
231 | eltree_update(struct hfsc_class *cl) | |
232 | { | |
233 | eltree_remove(cl); | |
234 | eltree_insert(cl); | |
235 | } | |
236 | ||
237 | /* find the class with the minimum deadline among the eligible classes */ | |
238 | static inline struct hfsc_class * | |
239 | eltree_get_mindl(struct hfsc_sched *q, u64 cur_time) | |
240 | { | |
241 | struct hfsc_class *p, *cl = NULL; | |
242 | struct rb_node *n; | |
243 | ||
244 | for (n = rb_first(&q->eligible); n != NULL; n = rb_next(n)) { | |
245 | p = rb_entry(n, struct hfsc_class, el_node); | |
246 | if (p->cl_e > cur_time) | |
247 | break; | |
248 | if (cl == NULL || p->cl_d < cl->cl_d) | |
249 | cl = p; | |
250 | } | |
251 | return cl; | |
252 | } | |
253 | ||
254 | /* find the class with minimum eligible time among the eligible classes */ | |
255 | static inline struct hfsc_class * | |
256 | eltree_get_minel(struct hfsc_sched *q) | |
257 | { | |
258 | struct rb_node *n; | |
10297b99 | 259 | |
1da177e4 LT |
260 | n = rb_first(&q->eligible); |
261 | if (n == NULL) | |
262 | return NULL; | |
263 | return rb_entry(n, struct hfsc_class, el_node); | |
264 | } | |
265 | ||
266 | /* | |
267 | * vttree holds holds backlogged child classes being sorted by their virtual | |
268 | * time. each intermediate class has one vttree. | |
269 | */ | |
270 | static void | |
271 | vttree_insert(struct hfsc_class *cl) | |
272 | { | |
273 | struct rb_node **p = &cl->cl_parent->vt_tree.rb_node; | |
274 | struct rb_node *parent = NULL; | |
275 | struct hfsc_class *cl1; | |
276 | ||
277 | while (*p != NULL) { | |
278 | parent = *p; | |
279 | cl1 = rb_entry(parent, struct hfsc_class, vt_node); | |
280 | if (cl->cl_vt >= cl1->cl_vt) | |
281 | p = &parent->rb_right; | |
282 | else | |
283 | p = &parent->rb_left; | |
284 | } | |
285 | rb_link_node(&cl->vt_node, parent, p); | |
286 | rb_insert_color(&cl->vt_node, &cl->cl_parent->vt_tree); | |
287 | } | |
288 | ||
289 | static inline void | |
290 | vttree_remove(struct hfsc_class *cl) | |
291 | { | |
292 | rb_erase(&cl->vt_node, &cl->cl_parent->vt_tree); | |
293 | } | |
294 | ||
295 | static inline void | |
296 | vttree_update(struct hfsc_class *cl) | |
297 | { | |
298 | vttree_remove(cl); | |
299 | vttree_insert(cl); | |
300 | } | |
301 | ||
302 | static inline struct hfsc_class * | |
303 | vttree_firstfit(struct hfsc_class *cl, u64 cur_time) | |
304 | { | |
305 | struct hfsc_class *p; | |
306 | struct rb_node *n; | |
307 | ||
308 | for (n = rb_first(&cl->vt_tree); n != NULL; n = rb_next(n)) { | |
309 | p = rb_entry(n, struct hfsc_class, vt_node); | |
310 | if (p->cl_f <= cur_time) | |
311 | return p; | |
312 | } | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | /* | |
317 | * get the leaf class with the minimum vt in the hierarchy | |
318 | */ | |
319 | static struct hfsc_class * | |
320 | vttree_get_minvt(struct hfsc_class *cl, u64 cur_time) | |
321 | { | |
322 | /* if root-class's cfmin is bigger than cur_time nothing to do */ | |
323 | if (cl->cl_cfmin > cur_time) | |
324 | return NULL; | |
325 | ||
326 | while (cl->level > 0) { | |
327 | cl = vttree_firstfit(cl, cur_time); | |
328 | if (cl == NULL) | |
329 | return NULL; | |
330 | /* | |
331 | * update parent's cl_cvtmin. | |
332 | */ | |
333 | if (cl->cl_parent->cl_cvtmin < cl->cl_vt) | |
334 | cl->cl_parent->cl_cvtmin = cl->cl_vt; | |
335 | } | |
336 | return cl; | |
337 | } | |
338 | ||
339 | static void | |
340 | cftree_insert(struct hfsc_class *cl) | |
341 | { | |
342 | struct rb_node **p = &cl->cl_parent->cf_tree.rb_node; | |
343 | struct rb_node *parent = NULL; | |
344 | struct hfsc_class *cl1; | |
345 | ||
346 | while (*p != NULL) { | |
347 | parent = *p; | |
348 | cl1 = rb_entry(parent, struct hfsc_class, cf_node); | |
349 | if (cl->cl_f >= cl1->cl_f) | |
350 | p = &parent->rb_right; | |
351 | else | |
352 | p = &parent->rb_left; | |
353 | } | |
354 | rb_link_node(&cl->cf_node, parent, p); | |
355 | rb_insert_color(&cl->cf_node, &cl->cl_parent->cf_tree); | |
356 | } | |
357 | ||
358 | static inline void | |
359 | cftree_remove(struct hfsc_class *cl) | |
360 | { | |
361 | rb_erase(&cl->cf_node, &cl->cl_parent->cf_tree); | |
362 | } | |
363 | ||
364 | static inline void | |
365 | cftree_update(struct hfsc_class *cl) | |
366 | { | |
367 | cftree_remove(cl); | |
368 | cftree_insert(cl); | |
369 | } | |
370 | ||
371 | /* | |
372 | * service curve support functions | |
373 | * | |
374 | * external service curve parameters | |
375 | * m: bps | |
376 | * d: us | |
377 | * internal service curve parameters | |
378 | * sm: (bytes/psched_us) << SM_SHIFT | |
379 | * ism: (psched_us/byte) << ISM_SHIFT | |
380 | * dx: psched_us | |
381 | * | |
641b9e0e | 382 | * The clock source resolution with ktime is 1.024us. |
1da177e4 LT |
383 | * |
384 | * sm and ism are scaled in order to keep effective digits. | |
385 | * SM_SHIFT and ISM_SHIFT are selected to keep at least 4 effective | |
386 | * digits in decimal using the following table. | |
387 | * | |
1da177e4 LT |
388 | * bits/sec 100Kbps 1Mbps 10Mbps 100Mbps 1Gbps |
389 | * ------------+------------------------------------------------------- | |
641b9e0e | 390 | * bytes/1.024us 12.8e-3 128e-3 1280e-3 12800e-3 128000e-3 |
1da177e4 | 391 | * |
641b9e0e | 392 | * 1.024us/byte 78.125 7.8125 0.78125 0.078125 0.0078125 |
1da177e4 LT |
393 | */ |
394 | #define SM_SHIFT 20 | |
395 | #define ISM_SHIFT 18 | |
396 | ||
397 | #define SM_MASK ((1ULL << SM_SHIFT) - 1) | |
398 | #define ISM_MASK ((1ULL << ISM_SHIFT) - 1) | |
399 | ||
400 | static inline u64 | |
401 | seg_x2y(u64 x, u64 sm) | |
402 | { | |
403 | u64 y; | |
404 | ||
405 | /* | |
406 | * compute | |
407 | * y = x * sm >> SM_SHIFT | |
408 | * but divide it for the upper and lower bits to avoid overflow | |
409 | */ | |
410 | y = (x >> SM_SHIFT) * sm + (((x & SM_MASK) * sm) >> SM_SHIFT); | |
411 | return y; | |
412 | } | |
413 | ||
414 | static inline u64 | |
415 | seg_y2x(u64 y, u64 ism) | |
416 | { | |
417 | u64 x; | |
418 | ||
419 | if (y == 0) | |
420 | x = 0; | |
421 | else if (ism == HT_INFINITY) | |
422 | x = HT_INFINITY; | |
423 | else { | |
424 | x = (y >> ISM_SHIFT) * ism | |
425 | + (((y & ISM_MASK) * ism) >> ISM_SHIFT); | |
426 | } | |
427 | return x; | |
428 | } | |
429 | ||
430 | /* Convert m (bps) into sm (bytes/psched us) */ | |
431 | static u64 | |
432 | m2sm(u32 m) | |
433 | { | |
434 | u64 sm; | |
435 | ||
436 | sm = ((u64)m << SM_SHIFT); | |
00c04af9 PM |
437 | sm += PSCHED_TICKS_PER_SEC - 1; |
438 | do_div(sm, PSCHED_TICKS_PER_SEC); | |
1da177e4 LT |
439 | return sm; |
440 | } | |
441 | ||
442 | /* convert m (bps) into ism (psched us/byte) */ | |
443 | static u64 | |
444 | m2ism(u32 m) | |
445 | { | |
446 | u64 ism; | |
447 | ||
448 | if (m == 0) | |
449 | ism = HT_INFINITY; | |
450 | else { | |
00c04af9 | 451 | ism = ((u64)PSCHED_TICKS_PER_SEC << ISM_SHIFT); |
1da177e4 LT |
452 | ism += m - 1; |
453 | do_div(ism, m); | |
454 | } | |
455 | return ism; | |
456 | } | |
457 | ||
458 | /* convert d (us) into dx (psched us) */ | |
459 | static u64 | |
460 | d2dx(u32 d) | |
461 | { | |
462 | u64 dx; | |
463 | ||
00c04af9 | 464 | dx = ((u64)d * PSCHED_TICKS_PER_SEC); |
538e43a4 PM |
465 | dx += USEC_PER_SEC - 1; |
466 | do_div(dx, USEC_PER_SEC); | |
1da177e4 LT |
467 | return dx; |
468 | } | |
469 | ||
470 | /* convert sm (bytes/psched us) into m (bps) */ | |
471 | static u32 | |
472 | sm2m(u64 sm) | |
473 | { | |
474 | u64 m; | |
475 | ||
00c04af9 | 476 | m = (sm * PSCHED_TICKS_PER_SEC) >> SM_SHIFT; |
1da177e4 LT |
477 | return (u32)m; |
478 | } | |
479 | ||
480 | /* convert dx (psched us) into d (us) */ | |
481 | static u32 | |
482 | dx2d(u64 dx) | |
483 | { | |
484 | u64 d; | |
485 | ||
538e43a4 | 486 | d = dx * USEC_PER_SEC; |
00c04af9 | 487 | do_div(d, PSCHED_TICKS_PER_SEC); |
1da177e4 LT |
488 | return (u32)d; |
489 | } | |
490 | ||
491 | static void | |
492 | sc2isc(struct tc_service_curve *sc, struct internal_sc *isc) | |
493 | { | |
494 | isc->sm1 = m2sm(sc->m1); | |
495 | isc->ism1 = m2ism(sc->m1); | |
496 | isc->dx = d2dx(sc->d); | |
497 | isc->dy = seg_x2y(isc->dx, isc->sm1); | |
498 | isc->sm2 = m2sm(sc->m2); | |
499 | isc->ism2 = m2ism(sc->m2); | |
500 | } | |
501 | ||
502 | /* | |
503 | * initialize the runtime service curve with the given internal | |
504 | * service curve starting at (x, y). | |
505 | */ | |
506 | static void | |
507 | rtsc_init(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y) | |
508 | { | |
509 | rtsc->x = x; | |
510 | rtsc->y = y; | |
511 | rtsc->sm1 = isc->sm1; | |
512 | rtsc->ism1 = isc->ism1; | |
513 | rtsc->dx = isc->dx; | |
514 | rtsc->dy = isc->dy; | |
515 | rtsc->sm2 = isc->sm2; | |
516 | rtsc->ism2 = isc->ism2; | |
517 | } | |
518 | ||
519 | /* | |
520 | * calculate the y-projection of the runtime service curve by the | |
521 | * given x-projection value | |
522 | */ | |
523 | static u64 | |
524 | rtsc_y2x(struct runtime_sc *rtsc, u64 y) | |
525 | { | |
526 | u64 x; | |
527 | ||
528 | if (y < rtsc->y) | |
529 | x = rtsc->x; | |
530 | else if (y <= rtsc->y + rtsc->dy) { | |
531 | /* x belongs to the 1st segment */ | |
532 | if (rtsc->dy == 0) | |
533 | x = rtsc->x + rtsc->dx; | |
534 | else | |
535 | x = rtsc->x + seg_y2x(y - rtsc->y, rtsc->ism1); | |
536 | } else { | |
537 | /* x belongs to the 2nd segment */ | |
538 | x = rtsc->x + rtsc->dx | |
539 | + seg_y2x(y - rtsc->y - rtsc->dy, rtsc->ism2); | |
540 | } | |
541 | return x; | |
542 | } | |
543 | ||
544 | static u64 | |
545 | rtsc_x2y(struct runtime_sc *rtsc, u64 x) | |
546 | { | |
547 | u64 y; | |
548 | ||
549 | if (x <= rtsc->x) | |
550 | y = rtsc->y; | |
551 | else if (x <= rtsc->x + rtsc->dx) | |
552 | /* y belongs to the 1st segment */ | |
553 | y = rtsc->y + seg_x2y(x - rtsc->x, rtsc->sm1); | |
554 | else | |
555 | /* y belongs to the 2nd segment */ | |
556 | y = rtsc->y + rtsc->dy | |
557 | + seg_x2y(x - rtsc->x - rtsc->dx, rtsc->sm2); | |
558 | return y; | |
559 | } | |
560 | ||
561 | /* | |
562 | * update the runtime service curve by taking the minimum of the current | |
563 | * runtime service curve and the service curve starting at (x, y). | |
564 | */ | |
565 | static void | |
566 | rtsc_min(struct runtime_sc *rtsc, struct internal_sc *isc, u64 x, u64 y) | |
567 | { | |
568 | u64 y1, y2, dx, dy; | |
569 | u32 dsm; | |
570 | ||
571 | if (isc->sm1 <= isc->sm2) { | |
572 | /* service curve is convex */ | |
573 | y1 = rtsc_x2y(rtsc, x); | |
574 | if (y1 < y) | |
575 | /* the current rtsc is smaller */ | |
576 | return; | |
577 | rtsc->x = x; | |
578 | rtsc->y = y; | |
579 | return; | |
580 | } | |
581 | ||
582 | /* | |
583 | * service curve is concave | |
584 | * compute the two y values of the current rtsc | |
585 | * y1: at x | |
586 | * y2: at (x + dx) | |
587 | */ | |
588 | y1 = rtsc_x2y(rtsc, x); | |
589 | if (y1 <= y) { | |
590 | /* rtsc is below isc, no change to rtsc */ | |
591 | return; | |
592 | } | |
593 | ||
594 | y2 = rtsc_x2y(rtsc, x + isc->dx); | |
595 | if (y2 >= y + isc->dy) { | |
596 | /* rtsc is above isc, replace rtsc by isc */ | |
597 | rtsc->x = x; | |
598 | rtsc->y = y; | |
599 | rtsc->dx = isc->dx; | |
600 | rtsc->dy = isc->dy; | |
601 | return; | |
602 | } | |
603 | ||
604 | /* | |
605 | * the two curves intersect | |
606 | * compute the offsets (dx, dy) using the reverse | |
607 | * function of seg_x2y() | |
608 | * seg_x2y(dx, sm1) == seg_x2y(dx, sm2) + (y1 - y) | |
609 | */ | |
610 | dx = (y1 - y) << SM_SHIFT; | |
611 | dsm = isc->sm1 - isc->sm2; | |
612 | do_div(dx, dsm); | |
613 | /* | |
614 | * check if (x, y1) belongs to the 1st segment of rtsc. | |
615 | * if so, add the offset. | |
616 | */ | |
617 | if (rtsc->x + rtsc->dx > x) | |
618 | dx += rtsc->x + rtsc->dx - x; | |
619 | dy = seg_x2y(dx, isc->sm1); | |
620 | ||
621 | rtsc->x = x; | |
622 | rtsc->y = y; | |
623 | rtsc->dx = dx; | |
624 | rtsc->dy = dy; | |
625 | return; | |
626 | } | |
627 | ||
628 | static void | |
629 | init_ed(struct hfsc_class *cl, unsigned int next_len) | |
630 | { | |
631 | u64 cur_time; | |
632 | ||
633 | PSCHED_GET_TIME(cur_time); | |
634 | ||
635 | /* update the deadline curve */ | |
636 | rtsc_min(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul); | |
637 | ||
638 | /* | |
639 | * update the eligible curve. | |
640 | * for concave, it is equal to the deadline curve. | |
641 | * for convex, it is a linear curve with slope m2. | |
642 | */ | |
643 | cl->cl_eligible = cl->cl_deadline; | |
644 | if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) { | |
645 | cl->cl_eligible.dx = 0; | |
646 | cl->cl_eligible.dy = 0; | |
647 | } | |
648 | ||
649 | /* compute e and d */ | |
650 | cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul); | |
651 | cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len); | |
652 | ||
653 | eltree_insert(cl); | |
654 | } | |
655 | ||
656 | static void | |
657 | update_ed(struct hfsc_class *cl, unsigned int next_len) | |
658 | { | |
659 | cl->cl_e = rtsc_y2x(&cl->cl_eligible, cl->cl_cumul); | |
660 | cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len); | |
661 | ||
662 | eltree_update(cl); | |
663 | } | |
664 | ||
665 | static inline void | |
666 | update_d(struct hfsc_class *cl, unsigned int next_len) | |
667 | { | |
668 | cl->cl_d = rtsc_y2x(&cl->cl_deadline, cl->cl_cumul + next_len); | |
669 | } | |
670 | ||
671 | static inline void | |
672 | update_cfmin(struct hfsc_class *cl) | |
673 | { | |
674 | struct rb_node *n = rb_first(&cl->cf_tree); | |
675 | struct hfsc_class *p; | |
676 | ||
677 | if (n == NULL) { | |
678 | cl->cl_cfmin = 0; | |
679 | return; | |
680 | } | |
681 | p = rb_entry(n, struct hfsc_class, cf_node); | |
682 | cl->cl_cfmin = p->cl_f; | |
683 | } | |
684 | ||
685 | static void | |
686 | init_vf(struct hfsc_class *cl, unsigned int len) | |
687 | { | |
688 | struct hfsc_class *max_cl; | |
689 | struct rb_node *n; | |
690 | u64 vt, f, cur_time; | |
691 | int go_active; | |
692 | ||
693 | cur_time = 0; | |
694 | go_active = 1; | |
695 | for (; cl->cl_parent != NULL; cl = cl->cl_parent) { | |
696 | if (go_active && cl->cl_nactive++ == 0) | |
697 | go_active = 1; | |
698 | else | |
699 | go_active = 0; | |
700 | ||
701 | if (go_active) { | |
702 | n = rb_last(&cl->cl_parent->vt_tree); | |
703 | if (n != NULL) { | |
704 | max_cl = rb_entry(n, struct hfsc_class,vt_node); | |
705 | /* | |
706 | * set vt to the average of the min and max | |
707 | * classes. if the parent's period didn't | |
708 | * change, don't decrease vt of the class. | |
709 | */ | |
710 | vt = max_cl->cl_vt; | |
711 | if (cl->cl_parent->cl_cvtmin != 0) | |
712 | vt = (cl->cl_parent->cl_cvtmin + vt)/2; | |
713 | ||
714 | if (cl->cl_parent->cl_vtperiod != | |
715 | cl->cl_parentperiod || vt > cl->cl_vt) | |
716 | cl->cl_vt = vt; | |
717 | } else { | |
718 | /* | |
719 | * first child for a new parent backlog period. | |
720 | * add parent's cvtmax to cvtoff to make a new | |
721 | * vt (vtoff + vt) larger than the vt in the | |
722 | * last period for all children. | |
723 | */ | |
724 | vt = cl->cl_parent->cl_cvtmax; | |
725 | cl->cl_parent->cl_cvtoff += vt; | |
726 | cl->cl_parent->cl_cvtmax = 0; | |
727 | cl->cl_parent->cl_cvtmin = 0; | |
728 | cl->cl_vt = 0; | |
729 | } | |
730 | ||
731 | cl->cl_vtoff = cl->cl_parent->cl_cvtoff - | |
732 | cl->cl_pcvtoff; | |
733 | ||
734 | /* update the virtual curve */ | |
735 | vt = cl->cl_vt + cl->cl_vtoff; | |
736 | rtsc_min(&cl->cl_virtual, &cl->cl_fsc, vt, | |
10297b99 | 737 | cl->cl_total); |
1da177e4 LT |
738 | if (cl->cl_virtual.x == vt) { |
739 | cl->cl_virtual.x -= cl->cl_vtoff; | |
740 | cl->cl_vtoff = 0; | |
741 | } | |
742 | cl->cl_vtadj = 0; | |
743 | ||
744 | cl->cl_vtperiod++; /* increment vt period */ | |
745 | cl->cl_parentperiod = cl->cl_parent->cl_vtperiod; | |
746 | if (cl->cl_parent->cl_nactive == 0) | |
747 | cl->cl_parentperiod++; | |
748 | cl->cl_f = 0; | |
749 | ||
750 | vttree_insert(cl); | |
751 | cftree_insert(cl); | |
752 | ||
753 | if (cl->cl_flags & HFSC_USC) { | |
754 | /* class has upper limit curve */ | |
755 | if (cur_time == 0) | |
756 | PSCHED_GET_TIME(cur_time); | |
757 | ||
758 | /* update the ulimit curve */ | |
759 | rtsc_min(&cl->cl_ulimit, &cl->cl_usc, cur_time, | |
10297b99 | 760 | cl->cl_total); |
1da177e4 LT |
761 | /* compute myf */ |
762 | cl->cl_myf = rtsc_y2x(&cl->cl_ulimit, | |
10297b99 | 763 | cl->cl_total); |
1da177e4 LT |
764 | cl->cl_myfadj = 0; |
765 | } | |
766 | } | |
767 | ||
768 | f = max(cl->cl_myf, cl->cl_cfmin); | |
769 | if (f != cl->cl_f) { | |
770 | cl->cl_f = f; | |
771 | cftree_update(cl); | |
772 | update_cfmin(cl->cl_parent); | |
773 | } | |
774 | } | |
775 | } | |
776 | ||
777 | static void | |
778 | update_vf(struct hfsc_class *cl, unsigned int len, u64 cur_time) | |
779 | { | |
780 | u64 f; /* , myf_bound, delta; */ | |
781 | int go_passive = 0; | |
782 | ||
783 | if (cl->qdisc->q.qlen == 0 && cl->cl_flags & HFSC_FSC) | |
784 | go_passive = 1; | |
785 | ||
786 | for (; cl->cl_parent != NULL; cl = cl->cl_parent) { | |
787 | cl->cl_total += len; | |
788 | ||
789 | if (!(cl->cl_flags & HFSC_FSC) || cl->cl_nactive == 0) | |
790 | continue; | |
791 | ||
792 | if (go_passive && --cl->cl_nactive == 0) | |
793 | go_passive = 1; | |
794 | else | |
795 | go_passive = 0; | |
796 | ||
797 | if (go_passive) { | |
798 | /* no more active child, going passive */ | |
799 | ||
800 | /* update cvtmax of the parent class */ | |
801 | if (cl->cl_vt > cl->cl_parent->cl_cvtmax) | |
802 | cl->cl_parent->cl_cvtmax = cl->cl_vt; | |
803 | ||
804 | /* remove this class from the vt tree */ | |
805 | vttree_remove(cl); | |
806 | ||
807 | cftree_remove(cl); | |
808 | update_cfmin(cl->cl_parent); | |
809 | ||
810 | continue; | |
811 | } | |
812 | ||
813 | /* | |
814 | * update vt and f | |
815 | */ | |
816 | cl->cl_vt = rtsc_y2x(&cl->cl_virtual, cl->cl_total) | |
10297b99 | 817 | - cl->cl_vtoff + cl->cl_vtadj; |
1da177e4 LT |
818 | |
819 | /* | |
820 | * if vt of the class is smaller than cvtmin, | |
821 | * the class was skipped in the past due to non-fit. | |
822 | * if so, we need to adjust vtadj. | |
823 | */ | |
824 | if (cl->cl_vt < cl->cl_parent->cl_cvtmin) { | |
825 | cl->cl_vtadj += cl->cl_parent->cl_cvtmin - cl->cl_vt; | |
826 | cl->cl_vt = cl->cl_parent->cl_cvtmin; | |
827 | } | |
828 | ||
829 | /* update the vt tree */ | |
830 | vttree_update(cl); | |
831 | ||
832 | if (cl->cl_flags & HFSC_USC) { | |
833 | cl->cl_myf = cl->cl_myfadj + rtsc_y2x(&cl->cl_ulimit, | |
10297b99 | 834 | cl->cl_total); |
1da177e4 LT |
835 | #if 0 |
836 | /* | |
837 | * This code causes classes to stay way under their | |
838 | * limit when multiple classes are used at gigabit | |
839 | * speed. needs investigation. -kaber | |
840 | */ | |
841 | /* | |
842 | * if myf lags behind by more than one clock tick | |
843 | * from the current time, adjust myfadj to prevent | |
844 | * a rate-limited class from going greedy. | |
845 | * in a steady state under rate-limiting, myf | |
846 | * fluctuates within one clock tick. | |
847 | */ | |
848 | myf_bound = cur_time - PSCHED_JIFFIE2US(1); | |
849 | if (cl->cl_myf < myf_bound) { | |
850 | delta = cur_time - cl->cl_myf; | |
851 | cl->cl_myfadj += delta; | |
852 | cl->cl_myf += delta; | |
853 | } | |
854 | #endif | |
855 | } | |
856 | ||
857 | f = max(cl->cl_myf, cl->cl_cfmin); | |
858 | if (f != cl->cl_f) { | |
859 | cl->cl_f = f; | |
860 | cftree_update(cl); | |
861 | update_cfmin(cl->cl_parent); | |
862 | } | |
863 | } | |
864 | } | |
865 | ||
866 | static void | |
867 | set_active(struct hfsc_class *cl, unsigned int len) | |
868 | { | |
869 | if (cl->cl_flags & HFSC_RSC) | |
870 | init_ed(cl, len); | |
871 | if (cl->cl_flags & HFSC_FSC) | |
872 | init_vf(cl, len); | |
873 | ||
874 | list_add_tail(&cl->dlist, &cl->sched->droplist); | |
875 | } | |
876 | ||
877 | static void | |
878 | set_passive(struct hfsc_class *cl) | |
879 | { | |
880 | if (cl->cl_flags & HFSC_RSC) | |
881 | eltree_remove(cl); | |
882 | ||
883 | list_del(&cl->dlist); | |
884 | ||
885 | /* | |
886 | * vttree is now handled in update_vf() so that update_vf(cl, 0, 0) | |
887 | * needs to be called explicitly to remove a class from vttree. | |
888 | */ | |
889 | } | |
890 | ||
891 | /* | |
892 | * hack to get length of first packet in queue. | |
893 | */ | |
894 | static unsigned int | |
895 | qdisc_peek_len(struct Qdisc *sch) | |
896 | { | |
897 | struct sk_buff *skb; | |
898 | unsigned int len; | |
899 | ||
900 | skb = sch->dequeue(sch); | |
901 | if (skb == NULL) { | |
902 | if (net_ratelimit()) | |
903 | printk("qdisc_peek_len: non work-conserving qdisc ?\n"); | |
904 | return 0; | |
905 | } | |
906 | len = skb->len; | |
907 | if (unlikely(sch->ops->requeue(skb, sch) != NET_XMIT_SUCCESS)) { | |
908 | if (net_ratelimit()) | |
909 | printk("qdisc_peek_len: failed to requeue\n"); | |
e488eafc | 910 | qdisc_tree_decrease_qlen(sch, 1); |
1da177e4 LT |
911 | return 0; |
912 | } | |
913 | return len; | |
914 | } | |
915 | ||
916 | static void | |
917 | hfsc_purge_queue(struct Qdisc *sch, struct hfsc_class *cl) | |
918 | { | |
919 | unsigned int len = cl->qdisc->q.qlen; | |
920 | ||
921 | qdisc_reset(cl->qdisc); | |
f973b913 | 922 | qdisc_tree_decrease_qlen(cl->qdisc, len); |
1da177e4 LT |
923 | } |
924 | ||
925 | static void | |
926 | hfsc_adjust_levels(struct hfsc_class *cl) | |
927 | { | |
928 | struct hfsc_class *p; | |
929 | unsigned int level; | |
930 | ||
931 | do { | |
932 | level = 0; | |
933 | list_for_each_entry(p, &cl->children, siblings) { | |
210525d6 PM |
934 | if (p->level >= level) |
935 | level = p->level + 1; | |
1da177e4 | 936 | } |
210525d6 | 937 | cl->level = level; |
1da177e4 LT |
938 | } while ((cl = cl->cl_parent) != NULL); |
939 | } | |
940 | ||
941 | static inline unsigned int | |
942 | hfsc_hash(u32 h) | |
943 | { | |
944 | h ^= h >> 8; | |
945 | h ^= h >> 4; | |
946 | ||
947 | return h & (HFSC_HSIZE - 1); | |
948 | } | |
949 | ||
950 | static inline struct hfsc_class * | |
951 | hfsc_find_class(u32 classid, struct Qdisc *sch) | |
952 | { | |
953 | struct hfsc_sched *q = qdisc_priv(sch); | |
954 | struct hfsc_class *cl; | |
955 | ||
956 | list_for_each_entry(cl, &q->clhash[hfsc_hash(classid)], hlist) { | |
957 | if (cl->classid == classid) | |
958 | return cl; | |
959 | } | |
960 | return NULL; | |
961 | } | |
962 | ||
963 | static void | |
964 | hfsc_change_rsc(struct hfsc_class *cl, struct tc_service_curve *rsc, | |
10297b99 | 965 | u64 cur_time) |
1da177e4 LT |
966 | { |
967 | sc2isc(rsc, &cl->cl_rsc); | |
968 | rtsc_init(&cl->cl_deadline, &cl->cl_rsc, cur_time, cl->cl_cumul); | |
969 | cl->cl_eligible = cl->cl_deadline; | |
970 | if (cl->cl_rsc.sm1 <= cl->cl_rsc.sm2) { | |
971 | cl->cl_eligible.dx = 0; | |
972 | cl->cl_eligible.dy = 0; | |
973 | } | |
974 | cl->cl_flags |= HFSC_RSC; | |
975 | } | |
976 | ||
977 | static void | |
978 | hfsc_change_fsc(struct hfsc_class *cl, struct tc_service_curve *fsc) | |
979 | { | |
980 | sc2isc(fsc, &cl->cl_fsc); | |
981 | rtsc_init(&cl->cl_virtual, &cl->cl_fsc, cl->cl_vt, cl->cl_total); | |
982 | cl->cl_flags |= HFSC_FSC; | |
983 | } | |
984 | ||
985 | static void | |
986 | hfsc_change_usc(struct hfsc_class *cl, struct tc_service_curve *usc, | |
10297b99 | 987 | u64 cur_time) |
1da177e4 LT |
988 | { |
989 | sc2isc(usc, &cl->cl_usc); | |
990 | rtsc_init(&cl->cl_ulimit, &cl->cl_usc, cur_time, cl->cl_total); | |
991 | cl->cl_flags |= HFSC_USC; | |
992 | } | |
993 | ||
994 | static int | |
995 | hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid, | |
10297b99 | 996 | struct rtattr **tca, unsigned long *arg) |
1da177e4 LT |
997 | { |
998 | struct hfsc_sched *q = qdisc_priv(sch); | |
999 | struct hfsc_class *cl = (struct hfsc_class *)*arg; | |
1000 | struct hfsc_class *parent = NULL; | |
1001 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
1002 | struct rtattr *tb[TCA_HFSC_MAX]; | |
1003 | struct tc_service_curve *rsc = NULL, *fsc = NULL, *usc = NULL; | |
1004 | u64 cur_time; | |
1005 | ||
1006 | if (opt == NULL || rtattr_parse_nested(tb, TCA_HFSC_MAX, opt)) | |
1007 | return -EINVAL; | |
1008 | ||
1009 | if (tb[TCA_HFSC_RSC-1]) { | |
1010 | if (RTA_PAYLOAD(tb[TCA_HFSC_RSC-1]) < sizeof(*rsc)) | |
1011 | return -EINVAL; | |
1012 | rsc = RTA_DATA(tb[TCA_HFSC_RSC-1]); | |
1013 | if (rsc->m1 == 0 && rsc->m2 == 0) | |
1014 | rsc = NULL; | |
1015 | } | |
1016 | ||
1017 | if (tb[TCA_HFSC_FSC-1]) { | |
1018 | if (RTA_PAYLOAD(tb[TCA_HFSC_FSC-1]) < sizeof(*fsc)) | |
1019 | return -EINVAL; | |
1020 | fsc = RTA_DATA(tb[TCA_HFSC_FSC-1]); | |
1021 | if (fsc->m1 == 0 && fsc->m2 == 0) | |
1022 | fsc = NULL; | |
1023 | } | |
1024 | ||
1025 | if (tb[TCA_HFSC_USC-1]) { | |
1026 | if (RTA_PAYLOAD(tb[TCA_HFSC_USC-1]) < sizeof(*usc)) | |
1027 | return -EINVAL; | |
1028 | usc = RTA_DATA(tb[TCA_HFSC_USC-1]); | |
1029 | if (usc->m1 == 0 && usc->m2 == 0) | |
1030 | usc = NULL; | |
1031 | } | |
1032 | ||
1033 | if (cl != NULL) { | |
1034 | if (parentid) { | |
1035 | if (cl->cl_parent && cl->cl_parent->classid != parentid) | |
1036 | return -EINVAL; | |
1037 | if (cl->cl_parent == NULL && parentid != TC_H_ROOT) | |
1038 | return -EINVAL; | |
1039 | } | |
1040 | PSCHED_GET_TIME(cur_time); | |
1041 | ||
1042 | sch_tree_lock(sch); | |
1043 | if (rsc != NULL) | |
1044 | hfsc_change_rsc(cl, rsc, cur_time); | |
1045 | if (fsc != NULL) | |
1046 | hfsc_change_fsc(cl, fsc); | |
1047 | if (usc != NULL) | |
1048 | hfsc_change_usc(cl, usc, cur_time); | |
1049 | ||
1050 | if (cl->qdisc->q.qlen != 0) { | |
1051 | if (cl->cl_flags & HFSC_RSC) | |
1052 | update_ed(cl, qdisc_peek_len(cl->qdisc)); | |
1053 | if (cl->cl_flags & HFSC_FSC) | |
1054 | update_vf(cl, 0, cur_time); | |
1055 | } | |
1056 | sch_tree_unlock(sch); | |
1057 | ||
1058 | #ifdef CONFIG_NET_ESTIMATOR | |
1059 | if (tca[TCA_RATE-1]) | |
1060 | gen_replace_estimator(&cl->bstats, &cl->rate_est, | |
1061 | cl->stats_lock, tca[TCA_RATE-1]); | |
1062 | #endif | |
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | if (parentid == TC_H_ROOT) | |
1067 | return -EEXIST; | |
1068 | ||
1069 | parent = &q->root; | |
1070 | if (parentid) { | |
1071 | parent = hfsc_find_class(parentid, sch); | |
1072 | if (parent == NULL) | |
1073 | return -ENOENT; | |
1074 | } | |
1075 | ||
1076 | if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0) | |
1077 | return -EINVAL; | |
1078 | if (hfsc_find_class(classid, sch)) | |
1079 | return -EEXIST; | |
1080 | ||
1081 | if (rsc == NULL && fsc == NULL) | |
1082 | return -EINVAL; | |
1083 | ||
0da974f4 | 1084 | cl = kzalloc(sizeof(struct hfsc_class), GFP_KERNEL); |
1da177e4 LT |
1085 | if (cl == NULL) |
1086 | return -ENOBUFS; | |
1da177e4 LT |
1087 | |
1088 | if (rsc != NULL) | |
1089 | hfsc_change_rsc(cl, rsc, 0); | |
1090 | if (fsc != NULL) | |
1091 | hfsc_change_fsc(cl, fsc); | |
1092 | if (usc != NULL) | |
1093 | hfsc_change_usc(cl, usc, 0); | |
1094 | ||
1095 | cl->refcnt = 1; | |
1096 | cl->classid = classid; | |
1097 | cl->sched = q; | |
1098 | cl->cl_parent = parent; | |
9f9afec4 | 1099 | cl->qdisc = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid); |
1da177e4 LT |
1100 | if (cl->qdisc == NULL) |
1101 | cl->qdisc = &noop_qdisc; | |
1102 | cl->stats_lock = &sch->dev->queue_lock; | |
1103 | INIT_LIST_HEAD(&cl->children); | |
1104 | cl->vt_tree = RB_ROOT; | |
1105 | cl->cf_tree = RB_ROOT; | |
1106 | ||
1107 | sch_tree_lock(sch); | |
1108 | list_add_tail(&cl->hlist, &q->clhash[hfsc_hash(classid)]); | |
1109 | list_add_tail(&cl->siblings, &parent->children); | |
1110 | if (parent->level == 0) | |
1111 | hfsc_purge_queue(sch, parent); | |
1112 | hfsc_adjust_levels(parent); | |
1113 | cl->cl_pcvtoff = parent->cl_cvtoff; | |
1114 | sch_tree_unlock(sch); | |
1115 | ||
1116 | #ifdef CONFIG_NET_ESTIMATOR | |
1117 | if (tca[TCA_RATE-1]) | |
1118 | gen_new_estimator(&cl->bstats, &cl->rate_est, | |
1119 | cl->stats_lock, tca[TCA_RATE-1]); | |
1120 | #endif | |
1121 | *arg = (unsigned long)cl; | |
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | static void | |
1126 | hfsc_destroy_filters(struct tcf_proto **fl) | |
1127 | { | |
1128 | struct tcf_proto *tp; | |
1129 | ||
1130 | while ((tp = *fl) != NULL) { | |
1131 | *fl = tp->next; | |
1132 | tcf_destroy(tp); | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | static void | |
1137 | hfsc_destroy_class(struct Qdisc *sch, struct hfsc_class *cl) | |
1138 | { | |
1139 | struct hfsc_sched *q = qdisc_priv(sch); | |
1140 | ||
1141 | hfsc_destroy_filters(&cl->filter_list); | |
1142 | qdisc_destroy(cl->qdisc); | |
1143 | #ifdef CONFIG_NET_ESTIMATOR | |
1144 | gen_kill_estimator(&cl->bstats, &cl->rate_est); | |
1145 | #endif | |
1146 | if (cl != &q->root) | |
1147 | kfree(cl); | |
1148 | } | |
1149 | ||
1150 | static int | |
1151 | hfsc_delete_class(struct Qdisc *sch, unsigned long arg) | |
1152 | { | |
1153 | struct hfsc_sched *q = qdisc_priv(sch); | |
1154 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1155 | ||
1156 | if (cl->level > 0 || cl->filter_cnt > 0 || cl == &q->root) | |
1157 | return -EBUSY; | |
1158 | ||
1159 | sch_tree_lock(sch); | |
1160 | ||
1da177e4 LT |
1161 | list_del(&cl->siblings); |
1162 | hfsc_adjust_levels(cl->cl_parent); | |
c38c83cb | 1163 | |
1da177e4 | 1164 | hfsc_purge_queue(sch, cl); |
c38c83cb PM |
1165 | list_del(&cl->hlist); |
1166 | ||
1da177e4 LT |
1167 | if (--cl->refcnt == 0) |
1168 | hfsc_destroy_class(sch, cl); | |
1169 | ||
1170 | sch_tree_unlock(sch); | |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | static struct hfsc_class * | |
1175 | hfsc_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) | |
1176 | { | |
1177 | struct hfsc_sched *q = qdisc_priv(sch); | |
1178 | struct hfsc_class *cl; | |
1179 | struct tcf_result res; | |
1180 | struct tcf_proto *tcf; | |
1181 | int result; | |
1182 | ||
1183 | if (TC_H_MAJ(skb->priority ^ sch->handle) == 0 && | |
1184 | (cl = hfsc_find_class(skb->priority, sch)) != NULL) | |
1185 | if (cl->level == 0) | |
1186 | return cl; | |
1187 | ||
29f1df6c | 1188 | *qerr = NET_XMIT_BYPASS; |
1da177e4 LT |
1189 | tcf = q->root.filter_list; |
1190 | while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) { | |
1191 | #ifdef CONFIG_NET_CLS_ACT | |
1192 | switch (result) { | |
1193 | case TC_ACT_QUEUED: | |
10297b99 | 1194 | case TC_ACT_STOLEN: |
1da177e4 | 1195 | *qerr = NET_XMIT_SUCCESS; |
10297b99 | 1196 | case TC_ACT_SHOT: |
1da177e4 LT |
1197 | return NULL; |
1198 | } | |
1199 | #elif defined(CONFIG_NET_CLS_POLICE) | |
1200 | if (result == TC_POLICE_SHOT) | |
1201 | return NULL; | |
1202 | #endif | |
1203 | if ((cl = (struct hfsc_class *)res.class) == NULL) { | |
1204 | if ((cl = hfsc_find_class(res.classid, sch)) == NULL) | |
1205 | break; /* filter selected invalid classid */ | |
1206 | } | |
1207 | ||
1208 | if (cl->level == 0) | |
1209 | return cl; /* hit leaf class */ | |
1210 | ||
1211 | /* apply inner filter chain */ | |
1212 | tcf = cl->filter_list; | |
1213 | } | |
1214 | ||
1215 | /* classification failed, try default class */ | |
1216 | cl = hfsc_find_class(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch); | |
1217 | if (cl == NULL || cl->level > 0) | |
1218 | return NULL; | |
1219 | ||
1220 | return cl; | |
1221 | } | |
1222 | ||
1223 | static int | |
1224 | hfsc_graft_class(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
10297b99 | 1225 | struct Qdisc **old) |
1da177e4 LT |
1226 | { |
1227 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1228 | ||
1229 | if (cl == NULL) | |
1230 | return -ENOENT; | |
1231 | if (cl->level > 0) | |
1232 | return -EINVAL; | |
1233 | if (new == NULL) { | |
9f9afec4 PM |
1234 | new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
1235 | cl->classid); | |
1da177e4 LT |
1236 | if (new == NULL) |
1237 | new = &noop_qdisc; | |
1238 | } | |
1239 | ||
1240 | sch_tree_lock(sch); | |
1241 | hfsc_purge_queue(sch, cl); | |
1242 | *old = xchg(&cl->qdisc, new); | |
1243 | sch_tree_unlock(sch); | |
1244 | return 0; | |
1245 | } | |
1246 | ||
1247 | static struct Qdisc * | |
1248 | hfsc_class_leaf(struct Qdisc *sch, unsigned long arg) | |
1249 | { | |
1250 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1251 | ||
1252 | if (cl != NULL && cl->level == 0) | |
1253 | return cl->qdisc; | |
1254 | ||
1255 | return NULL; | |
1256 | } | |
1257 | ||
f973b913 PM |
1258 | static void |
1259 | hfsc_qlen_notify(struct Qdisc *sch, unsigned long arg) | |
1260 | { | |
1261 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1262 | ||
1263 | if (cl->qdisc->q.qlen == 0) { | |
1264 | update_vf(cl, 0, 0); | |
1265 | set_passive(cl); | |
1266 | } | |
1267 | } | |
1268 | ||
1da177e4 LT |
1269 | static unsigned long |
1270 | hfsc_get_class(struct Qdisc *sch, u32 classid) | |
1271 | { | |
1272 | struct hfsc_class *cl = hfsc_find_class(classid, sch); | |
1273 | ||
1274 | if (cl != NULL) | |
1275 | cl->refcnt++; | |
1276 | ||
1277 | return (unsigned long)cl; | |
1278 | } | |
1279 | ||
1280 | static void | |
1281 | hfsc_put_class(struct Qdisc *sch, unsigned long arg) | |
1282 | { | |
1283 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1284 | ||
1285 | if (--cl->refcnt == 0) | |
1286 | hfsc_destroy_class(sch, cl); | |
1287 | } | |
1288 | ||
1289 | static unsigned long | |
1290 | hfsc_bind_tcf(struct Qdisc *sch, unsigned long parent, u32 classid) | |
1291 | { | |
1292 | struct hfsc_class *p = (struct hfsc_class *)parent; | |
1293 | struct hfsc_class *cl = hfsc_find_class(classid, sch); | |
1294 | ||
1295 | if (cl != NULL) { | |
1296 | if (p != NULL && p->level <= cl->level) | |
1297 | return 0; | |
1298 | cl->filter_cnt++; | |
1299 | } | |
1300 | ||
1301 | return (unsigned long)cl; | |
1302 | } | |
1303 | ||
1304 | static void | |
1305 | hfsc_unbind_tcf(struct Qdisc *sch, unsigned long arg) | |
1306 | { | |
1307 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1308 | ||
1309 | cl->filter_cnt--; | |
1310 | } | |
1311 | ||
1312 | static struct tcf_proto ** | |
1313 | hfsc_tcf_chain(struct Qdisc *sch, unsigned long arg) | |
1314 | { | |
1315 | struct hfsc_sched *q = qdisc_priv(sch); | |
1316 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1317 | ||
1318 | if (cl == NULL) | |
1319 | cl = &q->root; | |
1320 | ||
1321 | return &cl->filter_list; | |
1322 | } | |
1323 | ||
1324 | static int | |
1325 | hfsc_dump_sc(struct sk_buff *skb, int attr, struct internal_sc *sc) | |
1326 | { | |
1327 | struct tc_service_curve tsc; | |
1328 | ||
1329 | tsc.m1 = sm2m(sc->sm1); | |
1330 | tsc.d = dx2d(sc->dx); | |
1331 | tsc.m2 = sm2m(sc->sm2); | |
1332 | RTA_PUT(skb, attr, sizeof(tsc), &tsc); | |
1333 | ||
1334 | return skb->len; | |
1335 | ||
1336 | rtattr_failure: | |
1337 | return -1; | |
1338 | } | |
1339 | ||
1340 | static inline int | |
1341 | hfsc_dump_curves(struct sk_buff *skb, struct hfsc_class *cl) | |
1342 | { | |
1343 | if ((cl->cl_flags & HFSC_RSC) && | |
1344 | (hfsc_dump_sc(skb, TCA_HFSC_RSC, &cl->cl_rsc) < 0)) | |
1345 | goto rtattr_failure; | |
1346 | ||
1347 | if ((cl->cl_flags & HFSC_FSC) && | |
1348 | (hfsc_dump_sc(skb, TCA_HFSC_FSC, &cl->cl_fsc) < 0)) | |
1349 | goto rtattr_failure; | |
1350 | ||
1351 | if ((cl->cl_flags & HFSC_USC) && | |
1352 | (hfsc_dump_sc(skb, TCA_HFSC_USC, &cl->cl_usc) < 0)) | |
1353 | goto rtattr_failure; | |
1354 | ||
1355 | return skb->len; | |
1356 | ||
1357 | rtattr_failure: | |
1358 | return -1; | |
1359 | } | |
1360 | ||
1361 | static int | |
1362 | hfsc_dump_class(struct Qdisc *sch, unsigned long arg, struct sk_buff *skb, | |
10297b99 | 1363 | struct tcmsg *tcm) |
1da177e4 LT |
1364 | { |
1365 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
27a884dc | 1366 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1367 | struct rtattr *rta = (struct rtattr *)b; |
1368 | ||
1369 | tcm->tcm_parent = cl->cl_parent ? cl->cl_parent->classid : TC_H_ROOT; | |
1370 | tcm->tcm_handle = cl->classid; | |
1371 | if (cl->level == 0) | |
1372 | tcm->tcm_info = cl->qdisc->handle; | |
1373 | ||
1374 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
1375 | if (hfsc_dump_curves(skb, cl) < 0) | |
1376 | goto rtattr_failure; | |
27a884dc | 1377 | rta->rta_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1378 | return skb->len; |
1379 | ||
1380 | rtattr_failure: | |
1381 | skb_trim(skb, b - skb->data); | |
1382 | return -1; | |
1383 | } | |
1384 | ||
1385 | static int | |
1386 | hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg, | |
1387 | struct gnet_dump *d) | |
1388 | { | |
1389 | struct hfsc_class *cl = (struct hfsc_class *)arg; | |
1390 | struct tc_hfsc_stats xstats; | |
1391 | ||
1392 | cl->qstats.qlen = cl->qdisc->q.qlen; | |
1393 | xstats.level = cl->level; | |
1394 | xstats.period = cl->cl_vtperiod; | |
1395 | xstats.work = cl->cl_total; | |
1396 | xstats.rtwork = cl->cl_cumul; | |
1397 | ||
1398 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || | |
1399 | #ifdef CONFIG_NET_ESTIMATOR | |
1400 | gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || | |
1401 | #endif | |
1402 | gnet_stats_copy_queue(d, &cl->qstats) < 0) | |
1403 | return -1; | |
1404 | ||
1405 | return gnet_stats_copy_app(d, &xstats, sizeof(xstats)); | |
1406 | } | |
1407 | ||
1408 | ||
1409 | ||
1410 | static void | |
1411 | hfsc_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
1412 | { | |
1413 | struct hfsc_sched *q = qdisc_priv(sch); | |
1414 | struct hfsc_class *cl; | |
1415 | unsigned int i; | |
1416 | ||
1417 | if (arg->stop) | |
1418 | return; | |
1419 | ||
1420 | for (i = 0; i < HFSC_HSIZE; i++) { | |
1421 | list_for_each_entry(cl, &q->clhash[i], hlist) { | |
1422 | if (arg->count < arg->skip) { | |
1423 | arg->count++; | |
1424 | continue; | |
1425 | } | |
1426 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { | |
1427 | arg->stop = 1; | |
1428 | return; | |
1429 | } | |
1430 | arg->count++; | |
1431 | } | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | static void | |
ed2b229a | 1436 | hfsc_schedule_watchdog(struct Qdisc *sch) |
1da177e4 LT |
1437 | { |
1438 | struct hfsc_sched *q = qdisc_priv(sch); | |
1439 | struct hfsc_class *cl; | |
1440 | u64 next_time = 0; | |
1da177e4 LT |
1441 | |
1442 | if ((cl = eltree_get_minel(q)) != NULL) | |
1443 | next_time = cl->cl_e; | |
1444 | if (q->root.cl_cfmin != 0) { | |
1445 | if (next_time == 0 || next_time > q->root.cl_cfmin) | |
1446 | next_time = q->root.cl_cfmin; | |
1447 | } | |
3d50f231 | 1448 | WARN_ON(next_time == 0); |
ed2b229a | 1449 | qdisc_watchdog_schedule(&q->watchdog, next_time); |
1da177e4 LT |
1450 | } |
1451 | ||
1452 | static int | |
1453 | hfsc_init_qdisc(struct Qdisc *sch, struct rtattr *opt) | |
1454 | { | |
1455 | struct hfsc_sched *q = qdisc_priv(sch); | |
1456 | struct tc_hfsc_qopt *qopt; | |
1457 | unsigned int i; | |
1458 | ||
1459 | if (opt == NULL || RTA_PAYLOAD(opt) < sizeof(*qopt)) | |
1460 | return -EINVAL; | |
1461 | qopt = RTA_DATA(opt); | |
1462 | ||
1463 | sch->stats_lock = &sch->dev->queue_lock; | |
1464 | ||
1465 | q->defcls = qopt->defcls; | |
1466 | for (i = 0; i < HFSC_HSIZE; i++) | |
1467 | INIT_LIST_HEAD(&q->clhash[i]); | |
1468 | q->eligible = RB_ROOT; | |
1469 | INIT_LIST_HEAD(&q->droplist); | |
1470 | skb_queue_head_init(&q->requeue); | |
1471 | ||
1472 | q->root.refcnt = 1; | |
1473 | q->root.classid = sch->handle; | |
1474 | q->root.sched = q; | |
9f9afec4 PM |
1475 | q->root.qdisc = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
1476 | sch->handle); | |
1da177e4 LT |
1477 | if (q->root.qdisc == NULL) |
1478 | q->root.qdisc = &noop_qdisc; | |
1479 | q->root.stats_lock = &sch->dev->queue_lock; | |
1480 | INIT_LIST_HEAD(&q->root.children); | |
1481 | q->root.vt_tree = RB_ROOT; | |
1482 | q->root.cf_tree = RB_ROOT; | |
1483 | ||
1484 | list_add(&q->root.hlist, &q->clhash[hfsc_hash(q->root.classid)]); | |
1485 | ||
ed2b229a | 1486 | qdisc_watchdog_init(&q->watchdog, sch); |
1da177e4 LT |
1487 | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | static int | |
1492 | hfsc_change_qdisc(struct Qdisc *sch, struct rtattr *opt) | |
1493 | { | |
1494 | struct hfsc_sched *q = qdisc_priv(sch); | |
1495 | struct tc_hfsc_qopt *qopt; | |
1496 | ||
1497 | if (opt == NULL || RTA_PAYLOAD(opt) < sizeof(*qopt)) | |
1498 | return -EINVAL; | |
1499 | qopt = RTA_DATA(opt); | |
1500 | ||
1501 | sch_tree_lock(sch); | |
1502 | q->defcls = qopt->defcls; | |
1503 | sch_tree_unlock(sch); | |
1504 | ||
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | static void | |
1509 | hfsc_reset_class(struct hfsc_class *cl) | |
1510 | { | |
1511 | cl->cl_total = 0; | |
1512 | cl->cl_cumul = 0; | |
1513 | cl->cl_d = 0; | |
1514 | cl->cl_e = 0; | |
1515 | cl->cl_vt = 0; | |
1516 | cl->cl_vtadj = 0; | |
1517 | cl->cl_vtoff = 0; | |
1518 | cl->cl_cvtmin = 0; | |
1519 | cl->cl_cvtmax = 0; | |
1520 | cl->cl_cvtoff = 0; | |
1521 | cl->cl_pcvtoff = 0; | |
1522 | cl->cl_vtperiod = 0; | |
1523 | cl->cl_parentperiod = 0; | |
1524 | cl->cl_f = 0; | |
1525 | cl->cl_myf = 0; | |
1526 | cl->cl_myfadj = 0; | |
1527 | cl->cl_cfmin = 0; | |
1528 | cl->cl_nactive = 0; | |
1529 | ||
1530 | cl->vt_tree = RB_ROOT; | |
1531 | cl->cf_tree = RB_ROOT; | |
1532 | qdisc_reset(cl->qdisc); | |
1533 | ||
1534 | if (cl->cl_flags & HFSC_RSC) | |
1535 | rtsc_init(&cl->cl_deadline, &cl->cl_rsc, 0, 0); | |
1536 | if (cl->cl_flags & HFSC_FSC) | |
1537 | rtsc_init(&cl->cl_virtual, &cl->cl_fsc, 0, 0); | |
1538 | if (cl->cl_flags & HFSC_USC) | |
1539 | rtsc_init(&cl->cl_ulimit, &cl->cl_usc, 0, 0); | |
1540 | } | |
1541 | ||
1542 | static void | |
1543 | hfsc_reset_qdisc(struct Qdisc *sch) | |
1544 | { | |
1545 | struct hfsc_sched *q = qdisc_priv(sch); | |
1546 | struct hfsc_class *cl; | |
1547 | unsigned int i; | |
1548 | ||
1549 | for (i = 0; i < HFSC_HSIZE; i++) { | |
1550 | list_for_each_entry(cl, &q->clhash[i], hlist) | |
1551 | hfsc_reset_class(cl); | |
1552 | } | |
1553 | __skb_queue_purge(&q->requeue); | |
1554 | q->eligible = RB_ROOT; | |
1555 | INIT_LIST_HEAD(&q->droplist); | |
ed2b229a | 1556 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 LT |
1557 | sch->q.qlen = 0; |
1558 | } | |
1559 | ||
1560 | static void | |
1561 | hfsc_destroy_qdisc(struct Qdisc *sch) | |
1562 | { | |
1563 | struct hfsc_sched *q = qdisc_priv(sch); | |
1564 | struct hfsc_class *cl, *next; | |
1565 | unsigned int i; | |
1566 | ||
1567 | for (i = 0; i < HFSC_HSIZE; i++) { | |
1568 | list_for_each_entry_safe(cl, next, &q->clhash[i], hlist) | |
1569 | hfsc_destroy_class(sch, cl); | |
1570 | } | |
1571 | __skb_queue_purge(&q->requeue); | |
ed2b229a | 1572 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 LT |
1573 | } |
1574 | ||
1575 | static int | |
1576 | hfsc_dump_qdisc(struct Qdisc *sch, struct sk_buff *skb) | |
1577 | { | |
1578 | struct hfsc_sched *q = qdisc_priv(sch); | |
27a884dc | 1579 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1580 | struct tc_hfsc_qopt qopt; |
1581 | ||
1582 | qopt.defcls = q->defcls; | |
1583 | RTA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt); | |
1584 | return skb->len; | |
1585 | ||
1586 | rtattr_failure: | |
1587 | skb_trim(skb, b - skb->data); | |
1588 | return -1; | |
1589 | } | |
1590 | ||
1591 | static int | |
1592 | hfsc_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
1593 | { | |
1594 | struct hfsc_class *cl; | |
1595 | unsigned int len; | |
1596 | int err; | |
1597 | ||
1598 | cl = hfsc_classify(skb, sch, &err); | |
1599 | if (cl == NULL) { | |
29f1df6c | 1600 | if (err == NET_XMIT_BYPASS) |
1da177e4 LT |
1601 | sch->qstats.drops++; |
1602 | kfree_skb(skb); | |
1603 | return err; | |
1604 | } | |
1605 | ||
1606 | len = skb->len; | |
1607 | err = cl->qdisc->enqueue(skb, cl->qdisc); | |
1608 | if (unlikely(err != NET_XMIT_SUCCESS)) { | |
1609 | cl->qstats.drops++; | |
1610 | sch->qstats.drops++; | |
1611 | return err; | |
1612 | } | |
1613 | ||
1614 | if (cl->qdisc->q.qlen == 1) | |
1615 | set_active(cl, len); | |
1616 | ||
1617 | cl->bstats.packets++; | |
1618 | cl->bstats.bytes += len; | |
1619 | sch->bstats.packets++; | |
1620 | sch->bstats.bytes += len; | |
1621 | sch->q.qlen++; | |
1622 | ||
1623 | return NET_XMIT_SUCCESS; | |
1624 | } | |
1625 | ||
1626 | static struct sk_buff * | |
1627 | hfsc_dequeue(struct Qdisc *sch) | |
1628 | { | |
1629 | struct hfsc_sched *q = qdisc_priv(sch); | |
1630 | struct hfsc_class *cl; | |
1631 | struct sk_buff *skb; | |
1632 | u64 cur_time; | |
1633 | unsigned int next_len; | |
1634 | int realtime = 0; | |
1635 | ||
1636 | if (sch->q.qlen == 0) | |
1637 | return NULL; | |
1638 | if ((skb = __skb_dequeue(&q->requeue))) | |
1639 | goto out; | |
1640 | ||
1641 | PSCHED_GET_TIME(cur_time); | |
1642 | ||
1643 | /* | |
1644 | * if there are eligible classes, use real-time criteria. | |
1645 | * find the class with the minimum deadline among | |
1646 | * the eligible classes. | |
1647 | */ | |
1648 | if ((cl = eltree_get_mindl(q, cur_time)) != NULL) { | |
1649 | realtime = 1; | |
1650 | } else { | |
1651 | /* | |
1652 | * use link-sharing criteria | |
1653 | * get the class with the minimum vt in the hierarchy | |
1654 | */ | |
1655 | cl = vttree_get_minvt(&q->root, cur_time); | |
1656 | if (cl == NULL) { | |
1657 | sch->qstats.overlimits++; | |
ed2b229a | 1658 | hfsc_schedule_watchdog(sch); |
1da177e4 LT |
1659 | return NULL; |
1660 | } | |
1661 | } | |
1662 | ||
1663 | skb = cl->qdisc->dequeue(cl->qdisc); | |
1664 | if (skb == NULL) { | |
1665 | if (net_ratelimit()) | |
1666 | printk("HFSC: Non-work-conserving qdisc ?\n"); | |
1667 | return NULL; | |
1668 | } | |
1669 | ||
1670 | update_vf(cl, skb->len, cur_time); | |
1671 | if (realtime) | |
1672 | cl->cl_cumul += skb->len; | |
1673 | ||
1674 | if (cl->qdisc->q.qlen != 0) { | |
1675 | if (cl->cl_flags & HFSC_RSC) { | |
1676 | /* update ed */ | |
1677 | next_len = qdisc_peek_len(cl->qdisc); | |
1678 | if (realtime) | |
1679 | update_ed(cl, next_len); | |
1680 | else | |
1681 | update_d(cl, next_len); | |
1682 | } | |
1683 | } else { | |
1684 | /* the class becomes passive */ | |
1685 | set_passive(cl); | |
1686 | } | |
1687 | ||
1688 | out: | |
1689 | sch->flags &= ~TCQ_F_THROTTLED; | |
1690 | sch->q.qlen--; | |
1691 | ||
1692 | return skb; | |
1693 | } | |
1694 | ||
1695 | static int | |
1696 | hfsc_requeue(struct sk_buff *skb, struct Qdisc *sch) | |
1697 | { | |
1698 | struct hfsc_sched *q = qdisc_priv(sch); | |
1699 | ||
1700 | __skb_queue_head(&q->requeue, skb); | |
1701 | sch->q.qlen++; | |
1702 | sch->qstats.requeues++; | |
1703 | return NET_XMIT_SUCCESS; | |
1704 | } | |
1705 | ||
1706 | static unsigned int | |
1707 | hfsc_drop(struct Qdisc *sch) | |
1708 | { | |
1709 | struct hfsc_sched *q = qdisc_priv(sch); | |
1710 | struct hfsc_class *cl; | |
1711 | unsigned int len; | |
1712 | ||
1713 | list_for_each_entry(cl, &q->droplist, dlist) { | |
1714 | if (cl->qdisc->ops->drop != NULL && | |
1715 | (len = cl->qdisc->ops->drop(cl->qdisc)) > 0) { | |
1716 | if (cl->qdisc->q.qlen == 0) { | |
1717 | update_vf(cl, 0, 0); | |
1718 | set_passive(cl); | |
1719 | } else { | |
1720 | list_move_tail(&cl->dlist, &q->droplist); | |
1721 | } | |
1722 | cl->qstats.drops++; | |
1723 | sch->qstats.drops++; | |
1724 | sch->q.qlen--; | |
1725 | return len; | |
1726 | } | |
1727 | } | |
1728 | return 0; | |
1729 | } | |
1730 | ||
1731 | static struct Qdisc_class_ops hfsc_class_ops = { | |
1732 | .change = hfsc_change_class, | |
1733 | .delete = hfsc_delete_class, | |
1734 | .graft = hfsc_graft_class, | |
1735 | .leaf = hfsc_class_leaf, | |
f973b913 | 1736 | .qlen_notify = hfsc_qlen_notify, |
1da177e4 LT |
1737 | .get = hfsc_get_class, |
1738 | .put = hfsc_put_class, | |
1739 | .bind_tcf = hfsc_bind_tcf, | |
1740 | .unbind_tcf = hfsc_unbind_tcf, | |
1741 | .tcf_chain = hfsc_tcf_chain, | |
1742 | .dump = hfsc_dump_class, | |
1743 | .dump_stats = hfsc_dump_class_stats, | |
1744 | .walk = hfsc_walk | |
1745 | }; | |
1746 | ||
1747 | static struct Qdisc_ops hfsc_qdisc_ops = { | |
1748 | .id = "hfsc", | |
1749 | .init = hfsc_init_qdisc, | |
1750 | .change = hfsc_change_qdisc, | |
1751 | .reset = hfsc_reset_qdisc, | |
1752 | .destroy = hfsc_destroy_qdisc, | |
1753 | .dump = hfsc_dump_qdisc, | |
1754 | .enqueue = hfsc_enqueue, | |
1755 | .dequeue = hfsc_dequeue, | |
1756 | .requeue = hfsc_requeue, | |
1757 | .drop = hfsc_drop, | |
1758 | .cl_ops = &hfsc_class_ops, | |
1759 | .priv_size = sizeof(struct hfsc_sched), | |
1760 | .owner = THIS_MODULE | |
1761 | }; | |
1762 | ||
1763 | static int __init | |
1764 | hfsc_init(void) | |
1765 | { | |
1766 | return register_qdisc(&hfsc_qdisc_ops); | |
1767 | } | |
1768 | ||
1769 | static void __exit | |
1770 | hfsc_cleanup(void) | |
1771 | { | |
1772 | unregister_qdisc(&hfsc_qdisc_ops); | |
1773 | } | |
1774 | ||
1775 | MODULE_LICENSE("GPL"); | |
1776 | module_init(hfsc_init); | |
1777 | module_exit(hfsc_cleanup); |