Commit | Line | Data |
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87990467 | 1 | /* |
1da177e4 LT |
2 | * net/sched/sch_htb.c Hierarchical token bucket, feed tree version |
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 | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Martin Devera, <devik@cdi.cz> | |
10 | * | |
11 | * Credits (in time order) for older HTB versions: | |
12 | * Stef Coene <stef.coene@docum.org> | |
13 | * HTB support at LARTC mailing list | |
10297b99 | 14 | * Ondrej Kraus, <krauso@barr.cz> |
1da177e4 LT |
15 | * found missing INIT_QDISC(htb) |
16 | * Vladimir Smelhaus, Aamer Akhter, Bert Hubert | |
17 | * helped a lot to locate nasty class stall bug | |
18 | * Andi Kleen, Jamal Hadi, Bert Hubert | |
19 | * code review and helpful comments on shaping | |
20 | * Tomasz Wrona, <tw@eter.tym.pl> | |
21 | * created test case so that I was able to fix nasty bug | |
22 | * Wilfried Weissmann | |
23 | * spotted bug in dequeue code and helped with fix | |
24 | * Jiri Fojtasek | |
25 | * fixed requeue routine | |
26 | * and many others. thanks. | |
1da177e4 | 27 | */ |
1da177e4 | 28 | #include <linux/module.h> |
47083fc0 | 29 | #include <linux/moduleparam.h> |
1da177e4 LT |
30 | #include <linux/types.h> |
31 | #include <linux/kernel.h> | |
1da177e4 | 32 | #include <linux/string.h> |
1da177e4 | 33 | #include <linux/errno.h> |
1da177e4 LT |
34 | #include <linux/skbuff.h> |
35 | #include <linux/list.h> | |
36 | #include <linux/compiler.h> | |
0ba48053 | 37 | #include <linux/rbtree.h> |
1224736d | 38 | #include <linux/workqueue.h> |
dc5fc579 | 39 | #include <net/netlink.h> |
1da177e4 | 40 | #include <net/pkt_sched.h> |
1da177e4 LT |
41 | |
42 | /* HTB algorithm. | |
43 | Author: devik@cdi.cz | |
44 | ======================================================================== | |
45 | HTB is like TBF with multiple classes. It is also similar to CBQ because | |
10297b99 | 46 | it allows to assign priority to each class in hierarchy. |
1da177e4 LT |
47 | In fact it is another implementation of Floyd's formal sharing. |
48 | ||
49 | Levels: | |
10297b99 | 50 | Each class is assigned level. Leaf has ALWAYS level 0 and root |
1da177e4 LT |
51 | classes have level TC_HTB_MAXDEPTH-1. Interior nodes has level |
52 | one less than their parent. | |
53 | */ | |
54 | ||
47083fc0 | 55 | static int htb_hysteresis __read_mostly = 0; /* whether to use mode hysteresis for speedup */ |
87990467 | 56 | #define HTB_VER 0x30011 /* major must be matched with number suplied by TC as version */ |
1da177e4 LT |
57 | |
58 | #if HTB_VER >> 16 != TC_HTB_PROTOVER | |
59 | #error "Mismatched sch_htb.c and pkt_sch.h" | |
60 | #endif | |
61 | ||
47083fc0 JDB |
62 | /* Module parameter and sysfs export */ |
63 | module_param (htb_hysteresis, int, 0640); | |
64 | MODULE_PARM_DESC(htb_hysteresis, "Hysteresis mode, less CPU load, less accurate"); | |
65 | ||
1da177e4 LT |
66 | /* used internaly to keep status of single class */ |
67 | enum htb_cmode { | |
87990467 SH |
68 | HTB_CANT_SEND, /* class can't send and can't borrow */ |
69 | HTB_MAY_BORROW, /* class can't send but may borrow */ | |
70 | HTB_CAN_SEND /* class can send */ | |
1da177e4 LT |
71 | }; |
72 | ||
73 | /* interior & leaf nodes; props specific to leaves are marked L: */ | |
87990467 | 74 | struct htb_class { |
f4c1f3e0 | 75 | struct Qdisc_class_common common; |
87990467 | 76 | /* general class parameters */ |
c1a8f1f1 | 77 | struct gnet_stats_basic_packed bstats; |
87990467 SH |
78 | struct gnet_stats_queue qstats; |
79 | struct gnet_stats_rate_est rate_est; | |
80 | struct tc_htb_xstats xstats; /* our special stats */ | |
81 | int refcnt; /* usage count of this class */ | |
1da177e4 | 82 | |
87990467 SH |
83 | /* topology */ |
84 | int level; /* our level (see above) */ | |
42077599 | 85 | unsigned int children; |
87990467 | 86 | struct htb_class *parent; /* parent class */ |
87990467 | 87 | |
c19f7a34 JP |
88 | int prio; /* these two are used only by leaves... */ |
89 | int quantum; /* but stored for parent-to-leaf return */ | |
90 | ||
87990467 SH |
91 | union { |
92 | struct htb_class_leaf { | |
93 | struct Qdisc *q; | |
87990467 SH |
94 | int deficit[TC_HTB_MAXDEPTH]; |
95 | struct list_head drop_list; | |
96 | } leaf; | |
97 | struct htb_class_inner { | |
98 | struct rb_root feed[TC_HTB_NUMPRIO]; /* feed trees */ | |
99 | struct rb_node *ptr[TC_HTB_NUMPRIO]; /* current class ptr */ | |
100 | /* When class changes from state 1->2 and disconnects from | |
101 | parent's feed then we lost ptr value and start from the | |
102 | first child again. Here we store classid of the | |
103 | last valid ptr (used when ptr is NULL). */ | |
104 | u32 last_ptr_id[TC_HTB_NUMPRIO]; | |
105 | } inner; | |
106 | } un; | |
107 | struct rb_node node[TC_HTB_NUMPRIO]; /* node for self or feed tree */ | |
108 | struct rb_node pq_node; /* node for event queue */ | |
fb983d45 | 109 | psched_time_t pq_key; |
87990467 SH |
110 | |
111 | int prio_activity; /* for which prios are we active */ | |
112 | enum htb_cmode cmode; /* current mode of the class */ | |
113 | ||
114 | /* class attached filters */ | |
115 | struct tcf_proto *filter_list; | |
116 | int filter_cnt; | |
117 | ||
87990467 SH |
118 | /* token bucket parameters */ |
119 | struct qdisc_rate_table *rate; /* rate table of the class itself */ | |
120 | struct qdisc_rate_table *ceil; /* ceiling rate (limits borrows too) */ | |
121 | long buffer, cbuffer; /* token bucket depth/rate */ | |
122 | psched_tdiff_t mbuffer; /* max wait time */ | |
123 | long tokens, ctokens; /* current number of tokens */ | |
124 | psched_time_t t_c; /* checkpoint time */ | |
1da177e4 LT |
125 | }; |
126 | ||
87990467 | 127 | struct htb_sched { |
f4c1f3e0 | 128 | struct Qdisc_class_hash clhash; |
0cef296d | 129 | struct list_head drops[TC_HTB_NUMPRIO];/* active leaves (for drops) */ |
87990467 SH |
130 | |
131 | /* self list - roots of self generating tree */ | |
132 | struct rb_root row[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; | |
133 | int row_mask[TC_HTB_MAXDEPTH]; | |
134 | struct rb_node *ptr[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; | |
135 | u32 last_ptr_id[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; | |
1da177e4 | 136 | |
87990467 SH |
137 | /* self wait list - roots of wait PQs per row */ |
138 | struct rb_root wait_pq[TC_HTB_MAXDEPTH]; | |
1da177e4 | 139 | |
87990467 | 140 | /* time of nearest event per level (row) */ |
fb983d45 | 141 | psched_time_t near_ev_cache[TC_HTB_MAXDEPTH]; |
1da177e4 | 142 | |
87990467 | 143 | int defcls; /* class where unclassified flows go to */ |
1da177e4 | 144 | |
87990467 SH |
145 | /* filters for qdisc itself */ |
146 | struct tcf_proto *filter_list; | |
1da177e4 | 147 | |
87990467 SH |
148 | int rate2quantum; /* quant = rate / rate2quantum */ |
149 | psched_time_t now; /* cached dequeue time */ | |
fb983d45 | 150 | struct qdisc_watchdog watchdog; |
1da177e4 | 151 | |
87990467 SH |
152 | /* non shaped skbs; let them go directly thru */ |
153 | struct sk_buff_head direct_queue; | |
154 | int direct_qlen; /* max qlen of above */ | |
155 | ||
156 | long direct_pkts; | |
e82181de JP |
157 | |
158 | #define HTB_WARN_TOOMANYEVENTS 0x1 | |
159 | unsigned int warned; /* only one warning */ | |
1224736d | 160 | struct work_struct work; |
1da177e4 LT |
161 | }; |
162 | ||
1da177e4 | 163 | /* find class in global hash table using given handle */ |
87990467 | 164 | static inline struct htb_class *htb_find(u32 handle, struct Qdisc *sch) |
1da177e4 LT |
165 | { |
166 | struct htb_sched *q = qdisc_priv(sch); | |
f4c1f3e0 | 167 | struct Qdisc_class_common *clc; |
0cef296d | 168 | |
f4c1f3e0 PM |
169 | clc = qdisc_class_find(&q->clhash, handle); |
170 | if (clc == NULL) | |
1da177e4 | 171 | return NULL; |
f4c1f3e0 | 172 | return container_of(clc, struct htb_class, common); |
1da177e4 LT |
173 | } |
174 | ||
175 | /** | |
176 | * htb_classify - classify a packet into class | |
177 | * | |
178 | * It returns NULL if the packet should be dropped or -1 if the packet | |
179 | * should be passed directly thru. In all other cases leaf class is returned. | |
180 | * We allow direct class selection by classid in priority. The we examine | |
181 | * filters in qdisc and in inner nodes (if higher filter points to the inner | |
182 | * node). If we end up with classid MAJOR:0 we enqueue the skb into special | |
10297b99 | 183 | * internal fifo (direct). These packets then go directly thru. If we still |
1da177e4 LT |
184 | * have no valid leaf we try to use MAJOR:default leaf. It still unsuccessfull |
185 | * then finish and return direct queue. | |
186 | */ | |
187 | #define HTB_DIRECT (struct htb_class*)-1 | |
1da177e4 | 188 | |
87990467 SH |
189 | static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch, |
190 | int *qerr) | |
1da177e4 LT |
191 | { |
192 | struct htb_sched *q = qdisc_priv(sch); | |
193 | struct htb_class *cl; | |
194 | struct tcf_result res; | |
195 | struct tcf_proto *tcf; | |
196 | int result; | |
197 | ||
198 | /* allow to select class by setting skb->priority to valid classid; | |
199 | note that nfmark can be used too by attaching filter fw with no | |
200 | rules in it */ | |
201 | if (skb->priority == sch->handle) | |
87990467 SH |
202 | return HTB_DIRECT; /* X:0 (direct flow) selected */ |
203 | if ((cl = htb_find(skb->priority, sch)) != NULL && cl->level == 0) | |
1da177e4 LT |
204 | return cl; |
205 | ||
c27f339a | 206 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
1da177e4 LT |
207 | tcf = q->filter_list; |
208 | while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) { | |
209 | #ifdef CONFIG_NET_CLS_ACT | |
210 | switch (result) { | |
211 | case TC_ACT_QUEUED: | |
87990467 | 212 | case TC_ACT_STOLEN: |
378a2f09 | 213 | *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
1da177e4 LT |
214 | case TC_ACT_SHOT: |
215 | return NULL; | |
216 | } | |
1da177e4 | 217 | #endif |
87990467 | 218 | if ((cl = (void *)res.class) == NULL) { |
1da177e4 | 219 | if (res.classid == sch->handle) |
87990467 SH |
220 | return HTB_DIRECT; /* X:0 (direct flow) */ |
221 | if ((cl = htb_find(res.classid, sch)) == NULL) | |
222 | break; /* filter selected invalid classid */ | |
1da177e4 LT |
223 | } |
224 | if (!cl->level) | |
87990467 | 225 | return cl; /* we hit leaf; return it */ |
1da177e4 LT |
226 | |
227 | /* we have got inner class; apply inner filter chain */ | |
228 | tcf = cl->filter_list; | |
229 | } | |
230 | /* classification failed; try to use default class */ | |
87990467 | 231 | cl = htb_find(TC_H_MAKE(TC_H_MAJ(sch->handle), q->defcls), sch); |
1da177e4 | 232 | if (!cl || cl->level) |
87990467 | 233 | return HTB_DIRECT; /* bad default .. this is safe bet */ |
1da177e4 LT |
234 | return cl; |
235 | } | |
236 | ||
1da177e4 LT |
237 | /** |
238 | * htb_add_to_id_tree - adds class to the round robin list | |
239 | * | |
240 | * Routine adds class to the list (actually tree) sorted by classid. | |
241 | * Make sure that class is not already on such list for given prio. | |
242 | */ | |
87990467 SH |
243 | static void htb_add_to_id_tree(struct rb_root *root, |
244 | struct htb_class *cl, int prio) | |
1da177e4 LT |
245 | { |
246 | struct rb_node **p = &root->rb_node, *parent = NULL; | |
3bf72957 | 247 | |
1da177e4 | 248 | while (*p) { |
87990467 SH |
249 | struct htb_class *c; |
250 | parent = *p; | |
1da177e4 | 251 | c = rb_entry(parent, struct htb_class, node[prio]); |
3bf72957 | 252 | |
f4c1f3e0 | 253 | if (cl->common.classid > c->common.classid) |
1da177e4 | 254 | p = &parent->rb_right; |
87990467 | 255 | else |
1da177e4 LT |
256 | p = &parent->rb_left; |
257 | } | |
258 | rb_link_node(&cl->node[prio], parent, p); | |
259 | rb_insert_color(&cl->node[prio], root); | |
260 | } | |
261 | ||
262 | /** | |
263 | * htb_add_to_wait_tree - adds class to the event queue with delay | |
264 | * | |
265 | * The class is added to priority event queue to indicate that class will | |
266 | * change its mode in cl->pq_key microseconds. Make sure that class is not | |
267 | * already in the queue. | |
268 | */ | |
87990467 SH |
269 | static void htb_add_to_wait_tree(struct htb_sched *q, |
270 | struct htb_class *cl, long delay) | |
1da177e4 LT |
271 | { |
272 | struct rb_node **p = &q->wait_pq[cl->level].rb_node, *parent = NULL; | |
3bf72957 | 273 | |
fb983d45 PM |
274 | cl->pq_key = q->now + delay; |
275 | if (cl->pq_key == q->now) | |
1da177e4 LT |
276 | cl->pq_key++; |
277 | ||
278 | /* update the nearest event cache */ | |
fb983d45 | 279 | if (q->near_ev_cache[cl->level] > cl->pq_key) |
1da177e4 | 280 | q->near_ev_cache[cl->level] = cl->pq_key; |
87990467 | 281 | |
1da177e4 | 282 | while (*p) { |
87990467 SH |
283 | struct htb_class *c; |
284 | parent = *p; | |
1da177e4 | 285 | c = rb_entry(parent, struct htb_class, pq_node); |
fb983d45 | 286 | if (cl->pq_key >= c->pq_key) |
1da177e4 | 287 | p = &parent->rb_right; |
87990467 | 288 | else |
1da177e4 LT |
289 | p = &parent->rb_left; |
290 | } | |
291 | rb_link_node(&cl->pq_node, parent, p); | |
292 | rb_insert_color(&cl->pq_node, &q->wait_pq[cl->level]); | |
293 | } | |
294 | ||
295 | /** | |
296 | * htb_next_rb_node - finds next node in binary tree | |
297 | * | |
298 | * When we are past last key we return NULL. | |
299 | * Average complexity is 2 steps per call. | |
300 | */ | |
3696f625 | 301 | static inline void htb_next_rb_node(struct rb_node **n) |
1da177e4 LT |
302 | { |
303 | *n = rb_next(*n); | |
304 | } | |
305 | ||
306 | /** | |
307 | * htb_add_class_to_row - add class to its row | |
308 | * | |
309 | * The class is added to row at priorities marked in mask. | |
310 | * It does nothing if mask == 0. | |
311 | */ | |
87990467 SH |
312 | static inline void htb_add_class_to_row(struct htb_sched *q, |
313 | struct htb_class *cl, int mask) | |
1da177e4 | 314 | { |
1da177e4 LT |
315 | q->row_mask[cl->level] |= mask; |
316 | while (mask) { | |
317 | int prio = ffz(~mask); | |
318 | mask &= ~(1 << prio); | |
87990467 | 319 | htb_add_to_id_tree(q->row[cl->level] + prio, cl, prio); |
1da177e4 LT |
320 | } |
321 | } | |
322 | ||
3696f625 SH |
323 | /* If this triggers, it is a bug in this code, but it need not be fatal */ |
324 | static void htb_safe_rb_erase(struct rb_node *rb, struct rb_root *root) | |
325 | { | |
81771b3b | 326 | if (RB_EMPTY_NODE(rb)) { |
3696f625 SH |
327 | WARN_ON(1); |
328 | } else { | |
329 | rb_erase(rb, root); | |
330 | RB_CLEAR_NODE(rb); | |
331 | } | |
332 | } | |
333 | ||
334 | ||
1da177e4 LT |
335 | /** |
336 | * htb_remove_class_from_row - removes class from its row | |
337 | * | |
338 | * The class is removed from row at priorities marked in mask. | |
339 | * It does nothing if mask == 0. | |
340 | */ | |
87990467 SH |
341 | static inline void htb_remove_class_from_row(struct htb_sched *q, |
342 | struct htb_class *cl, int mask) | |
1da177e4 LT |
343 | { |
344 | int m = 0; | |
3bf72957 | 345 | |
1da177e4 LT |
346 | while (mask) { |
347 | int prio = ffz(~mask); | |
3696f625 | 348 | |
1da177e4 | 349 | mask &= ~(1 << prio); |
87990467 SH |
350 | if (q->ptr[cl->level][prio] == cl->node + prio) |
351 | htb_next_rb_node(q->ptr[cl->level] + prio); | |
3696f625 SH |
352 | |
353 | htb_safe_rb_erase(cl->node + prio, q->row[cl->level] + prio); | |
87990467 | 354 | if (!q->row[cl->level][prio].rb_node) |
1da177e4 LT |
355 | m |= 1 << prio; |
356 | } | |
1da177e4 LT |
357 | q->row_mask[cl->level] &= ~m; |
358 | } | |
359 | ||
360 | /** | |
361 | * htb_activate_prios - creates active classe's feed chain | |
362 | * | |
363 | * The class is connected to ancestors and/or appropriate rows | |
10297b99 | 364 | * for priorities it is participating on. cl->cmode must be new |
1da177e4 LT |
365 | * (activated) mode. It does nothing if cl->prio_activity == 0. |
366 | */ | |
87990467 | 367 | static void htb_activate_prios(struct htb_sched *q, struct htb_class *cl) |
1da177e4 LT |
368 | { |
369 | struct htb_class *p = cl->parent; | |
87990467 | 370 | long m, mask = cl->prio_activity; |
1da177e4 LT |
371 | |
372 | while (cl->cmode == HTB_MAY_BORROW && p && mask) { | |
87990467 SH |
373 | m = mask; |
374 | while (m) { | |
1da177e4 LT |
375 | int prio = ffz(~m); |
376 | m &= ~(1 << prio); | |
87990467 | 377 | |
1da177e4 LT |
378 | if (p->un.inner.feed[prio].rb_node) |
379 | /* parent already has its feed in use so that | |
380 | reset bit in mask as parent is already ok */ | |
381 | mask &= ~(1 << prio); | |
87990467 SH |
382 | |
383 | htb_add_to_id_tree(p->un.inner.feed + prio, cl, prio); | |
1da177e4 | 384 | } |
1da177e4 | 385 | p->prio_activity |= mask; |
87990467 SH |
386 | cl = p; |
387 | p = cl->parent; | |
3bf72957 | 388 | |
1da177e4 LT |
389 | } |
390 | if (cl->cmode == HTB_CAN_SEND && mask) | |
87990467 | 391 | htb_add_class_to_row(q, cl, mask); |
1da177e4 LT |
392 | } |
393 | ||
394 | /** | |
395 | * htb_deactivate_prios - remove class from feed chain | |
396 | * | |
10297b99 | 397 | * cl->cmode must represent old mode (before deactivation). It does |
1da177e4 LT |
398 | * nothing if cl->prio_activity == 0. Class is removed from all feed |
399 | * chains and rows. | |
400 | */ | |
401 | static void htb_deactivate_prios(struct htb_sched *q, struct htb_class *cl) | |
402 | { | |
403 | struct htb_class *p = cl->parent; | |
87990467 | 404 | long m, mask = cl->prio_activity; |
1da177e4 LT |
405 | |
406 | while (cl->cmode == HTB_MAY_BORROW && p && mask) { | |
87990467 SH |
407 | m = mask; |
408 | mask = 0; | |
1da177e4 LT |
409 | while (m) { |
410 | int prio = ffz(~m); | |
411 | m &= ~(1 << prio); | |
87990467 SH |
412 | |
413 | if (p->un.inner.ptr[prio] == cl->node + prio) { | |
1da177e4 LT |
414 | /* we are removing child which is pointed to from |
415 | parent feed - forget the pointer but remember | |
416 | classid */ | |
f4c1f3e0 | 417 | p->un.inner.last_ptr_id[prio] = cl->common.classid; |
1da177e4 LT |
418 | p->un.inner.ptr[prio] = NULL; |
419 | } | |
87990467 | 420 | |
3696f625 | 421 | htb_safe_rb_erase(cl->node + prio, p->un.inner.feed + prio); |
87990467 SH |
422 | |
423 | if (!p->un.inner.feed[prio].rb_node) | |
1da177e4 LT |
424 | mask |= 1 << prio; |
425 | } | |
3bf72957 | 426 | |
1da177e4 | 427 | p->prio_activity &= ~mask; |
87990467 SH |
428 | cl = p; |
429 | p = cl->parent; | |
3bf72957 | 430 | |
1da177e4 | 431 | } |
87990467 SH |
432 | if (cl->cmode == HTB_CAN_SEND && mask) |
433 | htb_remove_class_from_row(q, cl, mask); | |
1da177e4 LT |
434 | } |
435 | ||
18a63e86 SH |
436 | static inline long htb_lowater(const struct htb_class *cl) |
437 | { | |
47083fc0 JDB |
438 | if (htb_hysteresis) |
439 | return cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : 0; | |
440 | else | |
441 | return 0; | |
18a63e86 SH |
442 | } |
443 | static inline long htb_hiwater(const struct htb_class *cl) | |
444 | { | |
47083fc0 JDB |
445 | if (htb_hysteresis) |
446 | return cl->cmode == HTB_CAN_SEND ? -cl->buffer : 0; | |
447 | else | |
448 | return 0; | |
18a63e86 | 449 | } |
47083fc0 | 450 | |
18a63e86 | 451 | |
1da177e4 LT |
452 | /** |
453 | * htb_class_mode - computes and returns current class mode | |
454 | * | |
455 | * It computes cl's mode at time cl->t_c+diff and returns it. If mode | |
456 | * is not HTB_CAN_SEND then cl->pq_key is updated to time difference | |
10297b99 | 457 | * from now to time when cl will change its state. |
1da177e4 | 458 | * Also it is worth to note that class mode doesn't change simply |
10297b99 | 459 | * at cl->{c,}tokens == 0 but there can rather be hysteresis of |
1da177e4 LT |
460 | * 0 .. -cl->{c,}buffer range. It is meant to limit number of |
461 | * mode transitions per time unit. The speed gain is about 1/6. | |
462 | */ | |
87990467 SH |
463 | static inline enum htb_cmode |
464 | htb_class_mode(struct htb_class *cl, long *diff) | |
1da177e4 | 465 | { |
87990467 | 466 | long toks; |
1da177e4 | 467 | |
87990467 SH |
468 | if ((toks = (cl->ctokens + *diff)) < htb_lowater(cl)) { |
469 | *diff = -toks; | |
470 | return HTB_CANT_SEND; | |
471 | } | |
18a63e86 | 472 | |
87990467 SH |
473 | if ((toks = (cl->tokens + *diff)) >= htb_hiwater(cl)) |
474 | return HTB_CAN_SEND; | |
1da177e4 | 475 | |
87990467 SH |
476 | *diff = -toks; |
477 | return HTB_MAY_BORROW; | |
1da177e4 LT |
478 | } |
479 | ||
480 | /** | |
481 | * htb_change_class_mode - changes classe's mode | |
482 | * | |
483 | * This should be the only way how to change classe's mode under normal | |
484 | * cirsumstances. Routine will update feed lists linkage, change mode | |
485 | * and add class to the wait event queue if appropriate. New mode should | |
486 | * be different from old one and cl->pq_key has to be valid if changing | |
487 | * to mode other than HTB_CAN_SEND (see htb_add_to_wait_tree). | |
488 | */ | |
87990467 | 489 | static void |
1da177e4 | 490 | htb_change_class_mode(struct htb_sched *q, struct htb_class *cl, long *diff) |
87990467 SH |
491 | { |
492 | enum htb_cmode new_mode = htb_class_mode(cl, diff); | |
1da177e4 LT |
493 | |
494 | if (new_mode == cl->cmode) | |
87990467 SH |
495 | return; |
496 | ||
497 | if (cl->prio_activity) { /* not necessary: speed optimization */ | |
498 | if (cl->cmode != HTB_CANT_SEND) | |
499 | htb_deactivate_prios(q, cl); | |
1da177e4 | 500 | cl->cmode = new_mode; |
87990467 SH |
501 | if (new_mode != HTB_CANT_SEND) |
502 | htb_activate_prios(q, cl); | |
503 | } else | |
1da177e4 LT |
504 | cl->cmode = new_mode; |
505 | } | |
506 | ||
507 | /** | |
10297b99 | 508 | * htb_activate - inserts leaf cl into appropriate active feeds |
1da177e4 LT |
509 | * |
510 | * Routine learns (new) priority of leaf and activates feed chain | |
511 | * for the prio. It can be called on already active leaf safely. | |
512 | * It also adds leaf into droplist. | |
513 | */ | |
87990467 | 514 | static inline void htb_activate(struct htb_sched *q, struct htb_class *cl) |
1da177e4 | 515 | { |
547b792c | 516 | WARN_ON(cl->level || !cl->un.leaf.q || !cl->un.leaf.q->q.qlen); |
3bf72957 | 517 | |
1da177e4 | 518 | if (!cl->prio_activity) { |
c19f7a34 | 519 | cl->prio_activity = 1 << cl->prio; |
87990467 SH |
520 | htb_activate_prios(q, cl); |
521 | list_add_tail(&cl->un.leaf.drop_list, | |
c19f7a34 | 522 | q->drops + cl->prio); |
1da177e4 LT |
523 | } |
524 | } | |
525 | ||
526 | /** | |
10297b99 | 527 | * htb_deactivate - remove leaf cl from active feeds |
1da177e4 LT |
528 | * |
529 | * Make sure that leaf is active. In the other words it can't be called | |
530 | * with non-active leaf. It also removes class from the drop list. | |
531 | */ | |
87990467 | 532 | static inline void htb_deactivate(struct htb_sched *q, struct htb_class *cl) |
1da177e4 | 533 | { |
547b792c | 534 | WARN_ON(!cl->prio_activity); |
3bf72957 | 535 | |
87990467 | 536 | htb_deactivate_prios(q, cl); |
1da177e4 LT |
537 | cl->prio_activity = 0; |
538 | list_del_init(&cl->un.leaf.drop_list); | |
539 | } | |
540 | ||
541 | static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch) | |
542 | { | |
f30ab418 | 543 | int uninitialized_var(ret); |
87990467 SH |
544 | struct htb_sched *q = qdisc_priv(sch); |
545 | struct htb_class *cl = htb_classify(skb, sch, &ret); | |
546 | ||
547 | if (cl == HTB_DIRECT) { | |
548 | /* enqueue to helper queue */ | |
549 | if (q->direct_queue.qlen < q->direct_qlen) { | |
550 | __skb_queue_tail(&q->direct_queue, skb); | |
551 | q->direct_pkts++; | |
552 | } else { | |
553 | kfree_skb(skb); | |
554 | sch->qstats.drops++; | |
555 | return NET_XMIT_DROP; | |
556 | } | |
1da177e4 | 557 | #ifdef CONFIG_NET_CLS_ACT |
87990467 | 558 | } else if (!cl) { |
c27f339a | 559 | if (ret & __NET_XMIT_BYPASS) |
87990467 SH |
560 | sch->qstats.drops++; |
561 | kfree_skb(skb); | |
562 | return ret; | |
1da177e4 | 563 | #endif |
378a2f09 JP |
564 | } else if ((ret = qdisc_enqueue(skb, cl->un.leaf.q)) != NET_XMIT_SUCCESS) { |
565 | if (net_xmit_drop_count(ret)) { | |
566 | sch->qstats.drops++; | |
567 | cl->qstats.drops++; | |
568 | } | |
69747650 | 569 | return ret; |
87990467 | 570 | } else { |
c9726d68 RM |
571 | cl->bstats.packets += |
572 | skb_is_gso(skb)?skb_shinfo(skb)->gso_segs:1; | |
0abf77e5 | 573 | cl->bstats.bytes += qdisc_pkt_len(skb); |
87990467 SH |
574 | htb_activate(q, cl); |
575 | } | |
576 | ||
577 | sch->q.qlen++; | |
c9726d68 | 578 | sch->bstats.packets += skb_is_gso(skb)?skb_shinfo(skb)->gso_segs:1; |
0abf77e5 | 579 | sch->bstats.bytes += qdisc_pkt_len(skb); |
87990467 | 580 | return NET_XMIT_SUCCESS; |
1da177e4 LT |
581 | } |
582 | ||
59e4220a JP |
583 | static inline void htb_accnt_tokens(struct htb_class *cl, int bytes, long diff) |
584 | { | |
585 | long toks = diff + cl->tokens; | |
586 | ||
587 | if (toks > cl->buffer) | |
588 | toks = cl->buffer; | |
589 | toks -= (long) qdisc_l2t(cl->rate, bytes); | |
590 | if (toks <= -cl->mbuffer) | |
591 | toks = 1 - cl->mbuffer; | |
592 | ||
593 | cl->tokens = toks; | |
594 | } | |
595 | ||
596 | static inline void htb_accnt_ctokens(struct htb_class *cl, int bytes, long diff) | |
597 | { | |
598 | long toks = diff + cl->ctokens; | |
599 | ||
600 | if (toks > cl->cbuffer) | |
601 | toks = cl->cbuffer; | |
602 | toks -= (long) qdisc_l2t(cl->ceil, bytes); | |
603 | if (toks <= -cl->mbuffer) | |
604 | toks = 1 - cl->mbuffer; | |
605 | ||
606 | cl->ctokens = toks; | |
607 | } | |
608 | ||
1da177e4 LT |
609 | /** |
610 | * htb_charge_class - charges amount "bytes" to leaf and ancestors | |
611 | * | |
612 | * Routine assumes that packet "bytes" long was dequeued from leaf cl | |
613 | * borrowing from "level". It accounts bytes to ceil leaky bucket for | |
614 | * leaf and all ancestors and to rate bucket for ancestors at levels | |
615 | * "level" and higher. It also handles possible change of mode resulting | |
616 | * from the update. Note that mode can also increase here (MAY_BORROW to | |
617 | * CAN_SEND) because we can use more precise clock that event queue here. | |
618 | * In such case we remove class from event queue first. | |
619 | */ | |
87990467 | 620 | static void htb_charge_class(struct htb_sched *q, struct htb_class *cl, |
c9726d68 | 621 | int level, struct sk_buff *skb) |
87990467 | 622 | { |
0abf77e5 | 623 | int bytes = qdisc_pkt_len(skb); |
1da177e4 | 624 | enum htb_cmode old_mode; |
59e4220a | 625 | long diff; |
1da177e4 LT |
626 | |
627 | while (cl) { | |
03cc45c0 | 628 | diff = psched_tdiff_bounded(q->now, cl->t_c, cl->mbuffer); |
1da177e4 | 629 | if (cl->level >= level) { |
87990467 SH |
630 | if (cl->level == level) |
631 | cl->xstats.lends++; | |
59e4220a | 632 | htb_accnt_tokens(cl, bytes, diff); |
1da177e4 LT |
633 | } else { |
634 | cl->xstats.borrows++; | |
87990467 | 635 | cl->tokens += diff; /* we moved t_c; update tokens */ |
1da177e4 | 636 | } |
59e4220a | 637 | htb_accnt_ctokens(cl, bytes, diff); |
1da177e4 | 638 | cl->t_c = q->now; |
1da177e4 | 639 | |
87990467 SH |
640 | old_mode = cl->cmode; |
641 | diff = 0; | |
642 | htb_change_class_mode(q, cl, &diff); | |
1da177e4 LT |
643 | if (old_mode != cl->cmode) { |
644 | if (old_mode != HTB_CAN_SEND) | |
3696f625 | 645 | htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level); |
1da177e4 | 646 | if (cl->cmode != HTB_CAN_SEND) |
87990467 | 647 | htb_add_to_wait_tree(q, cl, diff); |
1da177e4 | 648 | } |
1da177e4 LT |
649 | |
650 | /* update byte stats except for leaves which are already updated */ | |
651 | if (cl->level) { | |
652 | cl->bstats.bytes += bytes; | |
c9726d68 RM |
653 | cl->bstats.packets += skb_is_gso(skb)? |
654 | skb_shinfo(skb)->gso_segs:1; | |
1da177e4 LT |
655 | } |
656 | cl = cl->parent; | |
657 | } | |
658 | } | |
659 | ||
660 | /** | |
661 | * htb_do_events - make mode changes to classes at the level | |
662 | * | |
fb983d45 | 663 | * Scans event queue for pending events and applies them. Returns time of |
1224736d | 664 | * next pending event (0 for no event in pq, q->now for too many events). |
fb983d45 | 665 | * Note: Applied are events whose have cl->pq_key <= q->now. |
1da177e4 | 666 | */ |
a73be040 JP |
667 | static psched_time_t htb_do_events(struct htb_sched *q, int level, |
668 | unsigned long start) | |
1da177e4 | 669 | { |
8f3ea33a MD |
670 | /* don't run for longer than 2 jiffies; 2 is used instead of |
671 | 1 to simplify things when jiffy is going to be incremented | |
672 | too soon */ | |
a73be040 | 673 | unsigned long stop_at = start + 2; |
8f3ea33a | 674 | while (time_before(jiffies, stop_at)) { |
1da177e4 LT |
675 | struct htb_class *cl; |
676 | long diff; | |
30bdbe39 AM |
677 | struct rb_node *p = rb_first(&q->wait_pq[level]); |
678 | ||
87990467 SH |
679 | if (!p) |
680 | return 0; | |
1da177e4 LT |
681 | |
682 | cl = rb_entry(p, struct htb_class, pq_node); | |
fb983d45 PM |
683 | if (cl->pq_key > q->now) |
684 | return cl->pq_key; | |
685 | ||
3696f625 | 686 | htb_safe_rb_erase(p, q->wait_pq + level); |
03cc45c0 | 687 | diff = psched_tdiff_bounded(q->now, cl->t_c, cl->mbuffer); |
87990467 | 688 | htb_change_class_mode(q, cl, &diff); |
1da177e4 | 689 | if (cl->cmode != HTB_CAN_SEND) |
87990467 | 690 | htb_add_to_wait_tree(q, cl, diff); |
1da177e4 | 691 | } |
1224736d JP |
692 | |
693 | /* too much load - let's continue after a break for scheduling */ | |
e82181de JP |
694 | if (!(q->warned & HTB_WARN_TOOMANYEVENTS)) { |
695 | printk(KERN_WARNING "htb: too many events!\n"); | |
696 | q->warned |= HTB_WARN_TOOMANYEVENTS; | |
697 | } | |
1224736d JP |
698 | |
699 | return q->now; | |
1da177e4 LT |
700 | } |
701 | ||
702 | /* Returns class->node+prio from id-tree where classe's id is >= id. NULL | |
703 | is no such one exists. */ | |
87990467 SH |
704 | static struct rb_node *htb_id_find_next_upper(int prio, struct rb_node *n, |
705 | u32 id) | |
1da177e4 LT |
706 | { |
707 | struct rb_node *r = NULL; | |
708 | while (n) { | |
87990467 SH |
709 | struct htb_class *cl = |
710 | rb_entry(n, struct htb_class, node[prio]); | |
87990467 | 711 | |
f4c1f3e0 | 712 | if (id > cl->common.classid) { |
1da177e4 | 713 | n = n->rb_right; |
1b5c0077 | 714 | } else if (id < cl->common.classid) { |
1da177e4 LT |
715 | r = n; |
716 | n = n->rb_left; | |
1b5c0077 JP |
717 | } else { |
718 | return n; | |
1da177e4 LT |
719 | } |
720 | } | |
721 | return r; | |
722 | } | |
723 | ||
724 | /** | |
725 | * htb_lookup_leaf - returns next leaf class in DRR order | |
726 | * | |
727 | * Find leaf where current feed pointers points to. | |
728 | */ | |
87990467 SH |
729 | static struct htb_class *htb_lookup_leaf(struct rb_root *tree, int prio, |
730 | struct rb_node **pptr, u32 * pid) | |
1da177e4 LT |
731 | { |
732 | int i; | |
733 | struct { | |
734 | struct rb_node *root; | |
735 | struct rb_node **pptr; | |
736 | u32 *pid; | |
87990467 SH |
737 | } stk[TC_HTB_MAXDEPTH], *sp = stk; |
738 | ||
512bb43e | 739 | BUG_ON(!tree->rb_node); |
1da177e4 LT |
740 | sp->root = tree->rb_node; |
741 | sp->pptr = pptr; | |
742 | sp->pid = pid; | |
743 | ||
744 | for (i = 0; i < 65535; i++) { | |
87990467 | 745 | if (!*sp->pptr && *sp->pid) { |
10297b99 | 746 | /* ptr was invalidated but id is valid - try to recover |
1da177e4 | 747 | the original or next ptr */ |
87990467 SH |
748 | *sp->pptr = |
749 | htb_id_find_next_upper(prio, sp->root, *sp->pid); | |
1da177e4 | 750 | } |
87990467 SH |
751 | *sp->pid = 0; /* ptr is valid now so that remove this hint as it |
752 | can become out of date quickly */ | |
753 | if (!*sp->pptr) { /* we are at right end; rewind & go up */ | |
1da177e4 | 754 | *sp->pptr = sp->root; |
87990467 | 755 | while ((*sp->pptr)->rb_left) |
1da177e4 LT |
756 | *sp->pptr = (*sp->pptr)->rb_left; |
757 | if (sp > stk) { | |
758 | sp--; | |
512bb43e JP |
759 | if (!*sp->pptr) { |
760 | WARN_ON(1); | |
87990467 | 761 | return NULL; |
512bb43e | 762 | } |
87990467 | 763 | htb_next_rb_node(sp->pptr); |
1da177e4 LT |
764 | } |
765 | } else { | |
766 | struct htb_class *cl; | |
87990467 SH |
767 | cl = rb_entry(*sp->pptr, struct htb_class, node[prio]); |
768 | if (!cl->level) | |
1da177e4 LT |
769 | return cl; |
770 | (++sp)->root = cl->un.inner.feed[prio].rb_node; | |
87990467 SH |
771 | sp->pptr = cl->un.inner.ptr + prio; |
772 | sp->pid = cl->un.inner.last_ptr_id + prio; | |
1da177e4 LT |
773 | } |
774 | } | |
547b792c | 775 | WARN_ON(1); |
1da177e4 LT |
776 | return NULL; |
777 | } | |
778 | ||
779 | /* dequeues packet at given priority and level; call only if | |
780 | you are sure that there is active class at prio/level */ | |
87990467 SH |
781 | static struct sk_buff *htb_dequeue_tree(struct htb_sched *q, int prio, |
782 | int level) | |
1da177e4 LT |
783 | { |
784 | struct sk_buff *skb = NULL; | |
87990467 | 785 | struct htb_class *cl, *start; |
1da177e4 | 786 | /* look initial class up in the row */ |
87990467 SH |
787 | start = cl = htb_lookup_leaf(q->row[level] + prio, prio, |
788 | q->ptr[level] + prio, | |
789 | q->last_ptr_id[level] + prio); | |
790 | ||
1da177e4 LT |
791 | do { |
792 | next: | |
512bb43e | 793 | if (unlikely(!cl)) |
87990467 | 794 | return NULL; |
1da177e4 LT |
795 | |
796 | /* class can be empty - it is unlikely but can be true if leaf | |
797 | qdisc drops packets in enqueue routine or if someone used | |
10297b99 | 798 | graft operation on the leaf since last dequeue; |
1da177e4 LT |
799 | simply deactivate and skip such class */ |
800 | if (unlikely(cl->un.leaf.q->q.qlen == 0)) { | |
801 | struct htb_class *next; | |
87990467 | 802 | htb_deactivate(q, cl); |
1da177e4 LT |
803 | |
804 | /* row/level might become empty */ | |
805 | if ((q->row_mask[level] & (1 << prio)) == 0) | |
87990467 | 806 | return NULL; |
1da177e4 | 807 | |
87990467 SH |
808 | next = htb_lookup_leaf(q->row[level] + prio, |
809 | prio, q->ptr[level] + prio, | |
810 | q->last_ptr_id[level] + prio); | |
811 | ||
812 | if (cl == start) /* fix start if we just deleted it */ | |
1da177e4 LT |
813 | start = next; |
814 | cl = next; | |
815 | goto next; | |
816 | } | |
87990467 SH |
817 | |
818 | skb = cl->un.leaf.q->dequeue(cl->un.leaf.q); | |
819 | if (likely(skb != NULL)) | |
1da177e4 | 820 | break; |
633fe66e | 821 | |
b00355db | 822 | qdisc_warn_nonwc("htb", cl->un.leaf.q); |
87990467 SH |
823 | htb_next_rb_node((level ? cl->parent->un.inner.ptr : q-> |
824 | ptr[0]) + prio); | |
825 | cl = htb_lookup_leaf(q->row[level] + prio, prio, | |
826 | q->ptr[level] + prio, | |
827 | q->last_ptr_id[level] + prio); | |
1da177e4 LT |
828 | |
829 | } while (cl != start); | |
830 | ||
831 | if (likely(skb != NULL)) { | |
0abf77e5 JK |
832 | cl->un.leaf.deficit[level] -= qdisc_pkt_len(skb); |
833 | if (cl->un.leaf.deficit[level] < 0) { | |
c19f7a34 | 834 | cl->un.leaf.deficit[level] += cl->quantum; |
87990467 SH |
835 | htb_next_rb_node((level ? cl->parent->un.inner.ptr : q-> |
836 | ptr[0]) + prio); | |
1da177e4 LT |
837 | } |
838 | /* this used to be after charge_class but this constelation | |
839 | gives us slightly better performance */ | |
840 | if (!cl->un.leaf.q->q.qlen) | |
87990467 | 841 | htb_deactivate(q, cl); |
c9726d68 | 842 | htb_charge_class(q, cl, level, skb); |
1da177e4 LT |
843 | } |
844 | return skb; | |
845 | } | |
846 | ||
1da177e4 LT |
847 | static struct sk_buff *htb_dequeue(struct Qdisc *sch) |
848 | { | |
849 | struct sk_buff *skb = NULL; | |
850 | struct htb_sched *q = qdisc_priv(sch); | |
851 | int level; | |
fb983d45 | 852 | psched_time_t next_event; |
a73be040 | 853 | unsigned long start_at; |
1da177e4 LT |
854 | |
855 | /* try to dequeue direct packets as high prio (!) to minimize cpu work */ | |
87990467 SH |
856 | skb = __skb_dequeue(&q->direct_queue); |
857 | if (skb != NULL) { | |
1da177e4 LT |
858 | sch->flags &= ~TCQ_F_THROTTLED; |
859 | sch->q.qlen--; | |
860 | return skb; | |
861 | } | |
862 | ||
87990467 SH |
863 | if (!sch->q.qlen) |
864 | goto fin; | |
3bebcda2 | 865 | q->now = psched_get_time(); |
a73be040 | 866 | start_at = jiffies; |
1da177e4 | 867 | |
fb983d45 | 868 | next_event = q->now + 5 * PSCHED_TICKS_PER_SEC; |
633fe66e | 869 | |
1da177e4 LT |
870 | for (level = 0; level < TC_HTB_MAXDEPTH; level++) { |
871 | /* common case optimization - skip event handler quickly */ | |
872 | int m; | |
fb983d45 PM |
873 | psched_time_t event; |
874 | ||
875 | if (q->now >= q->near_ev_cache[level]) { | |
a73be040 | 876 | event = htb_do_events(q, level, start_at); |
2e4b3b0e PM |
877 | if (!event) |
878 | event = q->now + PSCHED_TICKS_PER_SEC; | |
879 | q->near_ev_cache[level] = event; | |
1da177e4 | 880 | } else |
fb983d45 PM |
881 | event = q->near_ev_cache[level]; |
882 | ||
c0851347 | 883 | if (next_event > event) |
fb983d45 | 884 | next_event = event; |
87990467 | 885 | |
1da177e4 LT |
886 | m = ~q->row_mask[level]; |
887 | while (m != (int)(-1)) { | |
87990467 | 888 | int prio = ffz(m); |
1da177e4 | 889 | m |= 1 << prio; |
87990467 | 890 | skb = htb_dequeue_tree(q, prio, level); |
1da177e4 LT |
891 | if (likely(skb != NULL)) { |
892 | sch->q.qlen--; | |
893 | sch->flags &= ~TCQ_F_THROTTLED; | |
894 | goto fin; | |
895 | } | |
896 | } | |
897 | } | |
fb983d45 | 898 | sch->qstats.overlimits++; |
1224736d JP |
899 | if (likely(next_event > q->now)) |
900 | qdisc_watchdog_schedule(&q->watchdog, next_event); | |
901 | else | |
902 | schedule_work(&q->work); | |
1da177e4 | 903 | fin: |
1da177e4 LT |
904 | return skb; |
905 | } | |
906 | ||
907 | /* try to drop from each class (by prio) until one succeed */ | |
87990467 | 908 | static unsigned int htb_drop(struct Qdisc *sch) |
1da177e4 LT |
909 | { |
910 | struct htb_sched *q = qdisc_priv(sch); | |
911 | int prio; | |
912 | ||
913 | for (prio = TC_HTB_NUMPRIO - 1; prio >= 0; prio--) { | |
914 | struct list_head *p; | |
87990467 | 915 | list_for_each(p, q->drops + prio) { |
1da177e4 LT |
916 | struct htb_class *cl = list_entry(p, struct htb_class, |
917 | un.leaf.drop_list); | |
918 | unsigned int len; | |
87990467 SH |
919 | if (cl->un.leaf.q->ops->drop && |
920 | (len = cl->un.leaf.q->ops->drop(cl->un.leaf.q))) { | |
1da177e4 LT |
921 | sch->q.qlen--; |
922 | if (!cl->un.leaf.q->q.qlen) | |
87990467 | 923 | htb_deactivate(q, cl); |
1da177e4 LT |
924 | return len; |
925 | } | |
926 | } | |
927 | } | |
928 | return 0; | |
929 | } | |
930 | ||
931 | /* reset all classes */ | |
932 | /* always caled under BH & queue lock */ | |
87990467 | 933 | static void htb_reset(struct Qdisc *sch) |
1da177e4 LT |
934 | { |
935 | struct htb_sched *q = qdisc_priv(sch); | |
f4c1f3e0 PM |
936 | struct htb_class *cl; |
937 | struct hlist_node *n; | |
938 | unsigned int i; | |
0cef296d | 939 | |
f4c1f3e0 PM |
940 | for (i = 0; i < q->clhash.hashsize; i++) { |
941 | hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) { | |
1da177e4 | 942 | if (cl->level) |
87990467 | 943 | memset(&cl->un.inner, 0, sizeof(cl->un.inner)); |
1da177e4 | 944 | else { |
87990467 | 945 | if (cl->un.leaf.q) |
1da177e4 LT |
946 | qdisc_reset(cl->un.leaf.q); |
947 | INIT_LIST_HEAD(&cl->un.leaf.drop_list); | |
948 | } | |
949 | cl->prio_activity = 0; | |
950 | cl->cmode = HTB_CAN_SEND; | |
1da177e4 LT |
951 | |
952 | } | |
953 | } | |
fb983d45 | 954 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 LT |
955 | __skb_queue_purge(&q->direct_queue); |
956 | sch->q.qlen = 0; | |
87990467 SH |
957 | memset(q->row, 0, sizeof(q->row)); |
958 | memset(q->row_mask, 0, sizeof(q->row_mask)); | |
959 | memset(q->wait_pq, 0, sizeof(q->wait_pq)); | |
960 | memset(q->ptr, 0, sizeof(q->ptr)); | |
1da177e4 | 961 | for (i = 0; i < TC_HTB_NUMPRIO; i++) |
87990467 | 962 | INIT_LIST_HEAD(q->drops + i); |
1da177e4 LT |
963 | } |
964 | ||
27a3421e PM |
965 | static const struct nla_policy htb_policy[TCA_HTB_MAX + 1] = { |
966 | [TCA_HTB_PARMS] = { .len = sizeof(struct tc_htb_opt) }, | |
967 | [TCA_HTB_INIT] = { .len = sizeof(struct tc_htb_glob) }, | |
968 | [TCA_HTB_CTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, | |
969 | [TCA_HTB_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, | |
970 | }; | |
971 | ||
1224736d JP |
972 | static void htb_work_func(struct work_struct *work) |
973 | { | |
974 | struct htb_sched *q = container_of(work, struct htb_sched, work); | |
975 | struct Qdisc *sch = q->watchdog.qdisc; | |
976 | ||
977 | __netif_schedule(qdisc_root(sch)); | |
978 | } | |
979 | ||
1e90474c | 980 | static int htb_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 LT |
981 | { |
982 | struct htb_sched *q = qdisc_priv(sch); | |
1e90474c | 983 | struct nlattr *tb[TCA_HTB_INIT + 1]; |
1da177e4 | 984 | struct tc_htb_glob *gopt; |
cee63723 | 985 | int err; |
1da177e4 | 986 | int i; |
cee63723 PM |
987 | |
988 | if (!opt) | |
989 | return -EINVAL; | |
990 | ||
27a3421e | 991 | err = nla_parse_nested(tb, TCA_HTB_INIT, opt, htb_policy); |
cee63723 PM |
992 | if (err < 0) |
993 | return err; | |
994 | ||
27a3421e | 995 | if (tb[TCA_HTB_INIT] == NULL) { |
1da177e4 LT |
996 | printk(KERN_ERR "HTB: hey probably you have bad tc tool ?\n"); |
997 | return -EINVAL; | |
998 | } | |
1e90474c | 999 | gopt = nla_data(tb[TCA_HTB_INIT]); |
1da177e4 | 1000 | if (gopt->version != HTB_VER >> 16) { |
87990467 SH |
1001 | printk(KERN_ERR |
1002 | "HTB: need tc/htb version %d (minor is %d), you have %d\n", | |
1003 | HTB_VER >> 16, HTB_VER & 0xffff, gopt->version); | |
1da177e4 LT |
1004 | return -EINVAL; |
1005 | } | |
1da177e4 | 1006 | |
f4c1f3e0 PM |
1007 | err = qdisc_class_hash_init(&q->clhash); |
1008 | if (err < 0) | |
1009 | return err; | |
1da177e4 | 1010 | for (i = 0; i < TC_HTB_NUMPRIO; i++) |
87990467 | 1011 | INIT_LIST_HEAD(q->drops + i); |
1da177e4 | 1012 | |
fb983d45 | 1013 | qdisc_watchdog_init(&q->watchdog, sch); |
1224736d | 1014 | INIT_WORK(&q->work, htb_work_func); |
1da177e4 LT |
1015 | skb_queue_head_init(&q->direct_queue); |
1016 | ||
5ce2d488 | 1017 | q->direct_qlen = qdisc_dev(sch)->tx_queue_len; |
87990467 | 1018 | if (q->direct_qlen < 2) /* some devices have zero tx_queue_len */ |
1da177e4 | 1019 | q->direct_qlen = 2; |
1da177e4 | 1020 | |
1da177e4 LT |
1021 | if ((q->rate2quantum = gopt->rate2quantum) < 1) |
1022 | q->rate2quantum = 1; | |
1023 | q->defcls = gopt->defcls; | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | static int htb_dump(struct Qdisc *sch, struct sk_buff *skb) | |
1029 | { | |
102396ae | 1030 | spinlock_t *root_lock = qdisc_root_sleeping_lock(sch); |
1da177e4 | 1031 | struct htb_sched *q = qdisc_priv(sch); |
4b3550ef | 1032 | struct nlattr *nest; |
1da177e4 | 1033 | struct tc_htb_glob gopt; |
4b3550ef | 1034 | |
7698b4fc | 1035 | spin_lock_bh(root_lock); |
1da177e4 | 1036 | |
4b3550ef | 1037 | gopt.direct_pkts = q->direct_pkts; |
1da177e4 LT |
1038 | gopt.version = HTB_VER; |
1039 | gopt.rate2quantum = q->rate2quantum; | |
1040 | gopt.defcls = q->defcls; | |
3bf72957 | 1041 | gopt.debug = 0; |
4b3550ef PM |
1042 | |
1043 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
1044 | if (nest == NULL) | |
1045 | goto nla_put_failure; | |
1e90474c | 1046 | NLA_PUT(skb, TCA_HTB_INIT, sizeof(gopt), &gopt); |
4b3550ef PM |
1047 | nla_nest_end(skb, nest); |
1048 | ||
7698b4fc | 1049 | spin_unlock_bh(root_lock); |
1da177e4 | 1050 | return skb->len; |
4b3550ef | 1051 | |
1e90474c | 1052 | nla_put_failure: |
7698b4fc | 1053 | spin_unlock_bh(root_lock); |
4b3550ef | 1054 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1055 | return -1; |
1056 | } | |
1057 | ||
1058 | static int htb_dump_class(struct Qdisc *sch, unsigned long arg, | |
87990467 | 1059 | struct sk_buff *skb, struct tcmsg *tcm) |
1da177e4 | 1060 | { |
87990467 | 1061 | struct htb_class *cl = (struct htb_class *)arg; |
102396ae | 1062 | spinlock_t *root_lock = qdisc_root_sleeping_lock(sch); |
4b3550ef | 1063 | struct nlattr *nest; |
1da177e4 LT |
1064 | struct tc_htb_opt opt; |
1065 | ||
7698b4fc | 1066 | spin_lock_bh(root_lock); |
f4c1f3e0 PM |
1067 | tcm->tcm_parent = cl->parent ? cl->parent->common.classid : TC_H_ROOT; |
1068 | tcm->tcm_handle = cl->common.classid; | |
1da177e4 LT |
1069 | if (!cl->level && cl->un.leaf.q) |
1070 | tcm->tcm_info = cl->un.leaf.q->handle; | |
1071 | ||
4b3550ef PM |
1072 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1073 | if (nest == NULL) | |
1074 | goto nla_put_failure; | |
1da177e4 | 1075 | |
87990467 | 1076 | memset(&opt, 0, sizeof(opt)); |
1da177e4 | 1077 | |
87990467 SH |
1078 | opt.rate = cl->rate->rate; |
1079 | opt.buffer = cl->buffer; | |
1080 | opt.ceil = cl->ceil->rate; | |
1081 | opt.cbuffer = cl->cbuffer; | |
c19f7a34 JP |
1082 | opt.quantum = cl->quantum; |
1083 | opt.prio = cl->prio; | |
87990467 | 1084 | opt.level = cl->level; |
1e90474c | 1085 | NLA_PUT(skb, TCA_HTB_PARMS, sizeof(opt), &opt); |
4b3550ef PM |
1086 | |
1087 | nla_nest_end(skb, nest); | |
7698b4fc | 1088 | spin_unlock_bh(root_lock); |
1da177e4 | 1089 | return skb->len; |
4b3550ef | 1090 | |
1e90474c | 1091 | nla_put_failure: |
7698b4fc | 1092 | spin_unlock_bh(root_lock); |
4b3550ef | 1093 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1094 | return -1; |
1095 | } | |
1096 | ||
1097 | static int | |
87990467 | 1098 | htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d) |
1da177e4 | 1099 | { |
87990467 | 1100 | struct htb_class *cl = (struct htb_class *)arg; |
1da177e4 | 1101 | |
1da177e4 LT |
1102 | if (!cl->level && cl->un.leaf.q) |
1103 | cl->qstats.qlen = cl->un.leaf.q->q.qlen; | |
1104 | cl->xstats.tokens = cl->tokens; | |
1105 | cl->xstats.ctokens = cl->ctokens; | |
1106 | ||
1107 | if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || | |
d250a5f9 | 1108 | gnet_stats_copy_rate_est(d, NULL, &cl->rate_est) < 0 || |
1da177e4 LT |
1109 | gnet_stats_copy_queue(d, &cl->qstats) < 0) |
1110 | return -1; | |
1111 | ||
1112 | return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); | |
1113 | } | |
1114 | ||
1115 | static int htb_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, | |
87990467 | 1116 | struct Qdisc **old) |
1da177e4 | 1117 | { |
87990467 | 1118 | struct htb_class *cl = (struct htb_class *)arg; |
1da177e4 | 1119 | |
5b9a9ccf PM |
1120 | if (cl->level) |
1121 | return -EINVAL; | |
1122 | if (new == NULL && | |
1123 | (new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, | |
1124 | &pfifo_qdisc_ops, | |
1125 | cl->common.classid)) == NULL) | |
1126 | return -ENOBUFS; | |
1127 | ||
1128 | sch_tree_lock(sch); | |
1129 | *old = cl->un.leaf.q; | |
1130 | cl->un.leaf.q = new; | |
1131 | if (*old != NULL) { | |
1132 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); | |
1133 | qdisc_reset(*old); | |
1da177e4 | 1134 | } |
5b9a9ccf PM |
1135 | sch_tree_unlock(sch); |
1136 | return 0; | |
1da177e4 LT |
1137 | } |
1138 | ||
87990467 | 1139 | static struct Qdisc *htb_leaf(struct Qdisc *sch, unsigned long arg) |
1da177e4 | 1140 | { |
87990467 | 1141 | struct htb_class *cl = (struct htb_class *)arg; |
5b9a9ccf | 1142 | return !cl->level ? cl->un.leaf.q : NULL; |
1da177e4 LT |
1143 | } |
1144 | ||
256d61b8 PM |
1145 | static void htb_qlen_notify(struct Qdisc *sch, unsigned long arg) |
1146 | { | |
1147 | struct htb_class *cl = (struct htb_class *)arg; | |
1148 | ||
1149 | if (cl->un.leaf.q->q.qlen == 0) | |
1150 | htb_deactivate(qdisc_priv(sch), cl); | |
1151 | } | |
1152 | ||
1da177e4 LT |
1153 | static unsigned long htb_get(struct Qdisc *sch, u32 classid) |
1154 | { | |
87990467 SH |
1155 | struct htb_class *cl = htb_find(classid, sch); |
1156 | if (cl) | |
1da177e4 LT |
1157 | cl->refcnt++; |
1158 | return (unsigned long)cl; | |
1159 | } | |
1160 | ||
160d5e10 JP |
1161 | static inline int htb_parent_last_child(struct htb_class *cl) |
1162 | { | |
1163 | if (!cl->parent) | |
1164 | /* the root class */ | |
1165 | return 0; | |
42077599 | 1166 | if (cl->parent->children > 1) |
160d5e10 JP |
1167 | /* not the last child */ |
1168 | return 0; | |
160d5e10 JP |
1169 | return 1; |
1170 | } | |
1171 | ||
3ba08b00 JP |
1172 | static void htb_parent_to_leaf(struct htb_sched *q, struct htb_class *cl, |
1173 | struct Qdisc *new_q) | |
160d5e10 JP |
1174 | { |
1175 | struct htb_class *parent = cl->parent; | |
1176 | ||
547b792c | 1177 | WARN_ON(cl->level || !cl->un.leaf.q || cl->prio_activity); |
160d5e10 | 1178 | |
3ba08b00 JP |
1179 | if (parent->cmode != HTB_CAN_SEND) |
1180 | htb_safe_rb_erase(&parent->pq_node, q->wait_pq + parent->level); | |
1181 | ||
160d5e10 JP |
1182 | parent->level = 0; |
1183 | memset(&parent->un.inner, 0, sizeof(parent->un.inner)); | |
1184 | INIT_LIST_HEAD(&parent->un.leaf.drop_list); | |
1185 | parent->un.leaf.q = new_q ? new_q : &noop_qdisc; | |
160d5e10 JP |
1186 | parent->tokens = parent->buffer; |
1187 | parent->ctokens = parent->cbuffer; | |
3bebcda2 | 1188 | parent->t_c = psched_get_time(); |
160d5e10 JP |
1189 | parent->cmode = HTB_CAN_SEND; |
1190 | } | |
1191 | ||
87990467 | 1192 | static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl) |
1da177e4 | 1193 | { |
1da177e4 | 1194 | if (!cl->level) { |
547b792c | 1195 | WARN_ON(!cl->un.leaf.q); |
1da177e4 LT |
1196 | qdisc_destroy(cl->un.leaf.q); |
1197 | } | |
ee39e10c | 1198 | gen_kill_estimator(&cl->bstats, &cl->rate_est); |
1da177e4 LT |
1199 | qdisc_put_rtab(cl->rate); |
1200 | qdisc_put_rtab(cl->ceil); | |
87990467 | 1201 | |
ff31ab56 | 1202 | tcf_destroy_chain(&cl->filter_list); |
1da177e4 LT |
1203 | kfree(cl); |
1204 | } | |
1205 | ||
87990467 | 1206 | static void htb_destroy(struct Qdisc *sch) |
1da177e4 LT |
1207 | { |
1208 | struct htb_sched *q = qdisc_priv(sch); | |
fbd8f137 PM |
1209 | struct hlist_node *n, *next; |
1210 | struct htb_class *cl; | |
1211 | unsigned int i; | |
1da177e4 | 1212 | |
1224736d | 1213 | cancel_work_sync(&q->work); |
fb983d45 | 1214 | qdisc_watchdog_cancel(&q->watchdog); |
1da177e4 | 1215 | /* This line used to be after htb_destroy_class call below |
10297b99 | 1216 | and surprisingly it worked in 2.4. But it must precede it |
1da177e4 LT |
1217 | because filter need its target class alive to be able to call |
1218 | unbind_filter on it (without Oops). */ | |
ff31ab56 | 1219 | tcf_destroy_chain(&q->filter_list); |
87990467 | 1220 | |
f4c1f3e0 PM |
1221 | for (i = 0; i < q->clhash.hashsize; i++) { |
1222 | hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) | |
fbd8f137 PM |
1223 | tcf_destroy_chain(&cl->filter_list); |
1224 | } | |
f4c1f3e0 PM |
1225 | for (i = 0; i < q->clhash.hashsize; i++) { |
1226 | hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i], | |
1227 | common.hnode) | |
fbd8f137 PM |
1228 | htb_destroy_class(sch, cl); |
1229 | } | |
f4c1f3e0 | 1230 | qdisc_class_hash_destroy(&q->clhash); |
1da177e4 LT |
1231 | __skb_queue_purge(&q->direct_queue); |
1232 | } | |
1233 | ||
1234 | static int htb_delete(struct Qdisc *sch, unsigned long arg) | |
1235 | { | |
1236 | struct htb_sched *q = qdisc_priv(sch); | |
87990467 | 1237 | struct htb_class *cl = (struct htb_class *)arg; |
256d61b8 | 1238 | unsigned int qlen; |
160d5e10 JP |
1239 | struct Qdisc *new_q = NULL; |
1240 | int last_child = 0; | |
1da177e4 LT |
1241 | |
1242 | // TODO: why don't allow to delete subtree ? references ? does | |
1243 | // tc subsys quarantee us that in htb_destroy it holds no class | |
1244 | // refs so that we can remove children safely there ? | |
42077599 | 1245 | if (cl->children || cl->filter_cnt) |
1da177e4 | 1246 | return -EBUSY; |
87990467 | 1247 | |
160d5e10 | 1248 | if (!cl->level && htb_parent_last_child(cl)) { |
5ce2d488 | 1249 | new_q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd DM |
1250 | &pfifo_qdisc_ops, |
1251 | cl->parent->common.classid); | |
160d5e10 JP |
1252 | last_child = 1; |
1253 | } | |
1254 | ||
1da177e4 | 1255 | sch_tree_lock(sch); |
87990467 | 1256 | |
814a175e | 1257 | if (!cl->level) { |
256d61b8 | 1258 | qlen = cl->un.leaf.q->q.qlen; |
814a175e | 1259 | qdisc_reset(cl->un.leaf.q); |
256d61b8 | 1260 | qdisc_tree_decrease_qlen(cl->un.leaf.q, qlen); |
814a175e PM |
1261 | } |
1262 | ||
f4c1f3e0 PM |
1263 | /* delete from hash and active; remainder in destroy_class */ |
1264 | qdisc_class_hash_remove(&q->clhash, &cl->common); | |
26b284de JP |
1265 | if (cl->parent) |
1266 | cl->parent->children--; | |
c38c83cb | 1267 | |
1da177e4 | 1268 | if (cl->prio_activity) |
87990467 | 1269 | htb_deactivate(q, cl); |
1da177e4 | 1270 | |
fbd8f137 PM |
1271 | if (cl->cmode != HTB_CAN_SEND) |
1272 | htb_safe_rb_erase(&cl->pq_node, q->wait_pq + cl->level); | |
1273 | ||
160d5e10 | 1274 | if (last_child) |
3ba08b00 | 1275 | htb_parent_to_leaf(q, cl, new_q); |
160d5e10 | 1276 | |
7cd0a638 JP |
1277 | BUG_ON(--cl->refcnt == 0); |
1278 | /* | |
1279 | * This shouldn't happen: we "hold" one cops->get() when called | |
1280 | * from tc_ctl_tclass; the destroy method is done from cops->put(). | |
1281 | */ | |
1da177e4 LT |
1282 | |
1283 | sch_tree_unlock(sch); | |
1284 | return 0; | |
1285 | } | |
1286 | ||
1287 | static void htb_put(struct Qdisc *sch, unsigned long arg) | |
1288 | { | |
87990467 | 1289 | struct htb_class *cl = (struct htb_class *)arg; |
1da177e4 LT |
1290 | |
1291 | if (--cl->refcnt == 0) | |
87990467 | 1292 | htb_destroy_class(sch, cl); |
1da177e4 LT |
1293 | } |
1294 | ||
87990467 | 1295 | static int htb_change_class(struct Qdisc *sch, u32 classid, |
1e90474c | 1296 | u32 parentid, struct nlattr **tca, |
87990467 | 1297 | unsigned long *arg) |
1da177e4 LT |
1298 | { |
1299 | int err = -EINVAL; | |
1300 | struct htb_sched *q = qdisc_priv(sch); | |
87990467 | 1301 | struct htb_class *cl = (struct htb_class *)*arg, *parent; |
1e90474c | 1302 | struct nlattr *opt = tca[TCA_OPTIONS]; |
1da177e4 | 1303 | struct qdisc_rate_table *rtab = NULL, *ctab = NULL; |
1e90474c | 1304 | struct nlattr *tb[TCA_HTB_RTAB + 1]; |
1da177e4 LT |
1305 | struct tc_htb_opt *hopt; |
1306 | ||
1307 | /* extract all subattrs from opt attr */ | |
cee63723 PM |
1308 | if (!opt) |
1309 | goto failure; | |
1310 | ||
27a3421e | 1311 | err = nla_parse_nested(tb, TCA_HTB_RTAB, opt, htb_policy); |
cee63723 PM |
1312 | if (err < 0) |
1313 | goto failure; | |
1314 | ||
1315 | err = -EINVAL; | |
27a3421e | 1316 | if (tb[TCA_HTB_PARMS] == NULL) |
1da177e4 | 1317 | goto failure; |
1da177e4 | 1318 | |
87990467 SH |
1319 | parent = parentid == TC_H_ROOT ? NULL : htb_find(parentid, sch); |
1320 | ||
1e90474c | 1321 | hopt = nla_data(tb[TCA_HTB_PARMS]); |
3bf72957 | 1322 | |
1e90474c PM |
1323 | rtab = qdisc_get_rtab(&hopt->rate, tb[TCA_HTB_RTAB]); |
1324 | ctab = qdisc_get_rtab(&hopt->ceil, tb[TCA_HTB_CTAB]); | |
87990467 SH |
1325 | if (!rtab || !ctab) |
1326 | goto failure; | |
1da177e4 | 1327 | |
87990467 | 1328 | if (!cl) { /* new class */ |
1da177e4 | 1329 | struct Qdisc *new_q; |
3696f625 | 1330 | int prio; |
ee39e10c | 1331 | struct { |
1e90474c | 1332 | struct nlattr nla; |
ee39e10c PM |
1333 | struct gnet_estimator opt; |
1334 | } est = { | |
1e90474c PM |
1335 | .nla = { |
1336 | .nla_len = nla_attr_size(sizeof(est.opt)), | |
1337 | .nla_type = TCA_RATE, | |
ee39e10c PM |
1338 | }, |
1339 | .opt = { | |
1340 | /* 4s interval, 16s averaging constant */ | |
1341 | .interval = 2, | |
1342 | .ewma_log = 2, | |
1343 | }, | |
1344 | }; | |
3696f625 | 1345 | |
1da177e4 | 1346 | /* check for valid classid */ |
f64f9e71 JP |
1347 | if (!classid || TC_H_MAJ(classid ^ sch->handle) || |
1348 | htb_find(classid, sch)) | |
1da177e4 LT |
1349 | goto failure; |
1350 | ||
1351 | /* check maximal depth */ | |
1352 | if (parent && parent->parent && parent->parent->level < 2) { | |
1353 | printk(KERN_ERR "htb: tree is too deep\n"); | |
1354 | goto failure; | |
1355 | } | |
1356 | err = -ENOBUFS; | |
0da974f4 | 1357 | if ((cl = kzalloc(sizeof(*cl), GFP_KERNEL)) == NULL) |
1da177e4 | 1358 | goto failure; |
87990467 | 1359 | |
71bcb09a SH |
1360 | err = gen_new_estimator(&cl->bstats, &cl->rate_est, |
1361 | qdisc_root_sleeping_lock(sch), | |
1362 | tca[TCA_RATE] ? : &est.nla); | |
1363 | if (err) { | |
1364 | kfree(cl); | |
1365 | goto failure; | |
1366 | } | |
1367 | ||
1da177e4 | 1368 | cl->refcnt = 1; |
42077599 | 1369 | cl->children = 0; |
1da177e4 | 1370 | INIT_LIST_HEAD(&cl->un.leaf.drop_list); |
3696f625 SH |
1371 | RB_CLEAR_NODE(&cl->pq_node); |
1372 | ||
1373 | for (prio = 0; prio < TC_HTB_NUMPRIO; prio++) | |
1374 | RB_CLEAR_NODE(&cl->node[prio]); | |
1da177e4 LT |
1375 | |
1376 | /* create leaf qdisc early because it uses kmalloc(GFP_KERNEL) | |
1377 | so that can't be used inside of sch_tree_lock | |
1378 | -- thanks to Karlis Peisenieks */ | |
5ce2d488 | 1379 | new_q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
bb949fbd | 1380 | &pfifo_qdisc_ops, classid); |
1da177e4 LT |
1381 | sch_tree_lock(sch); |
1382 | if (parent && !parent->level) { | |
256d61b8 PM |
1383 | unsigned int qlen = parent->un.leaf.q->q.qlen; |
1384 | ||
1da177e4 | 1385 | /* turn parent into inner node */ |
256d61b8 PM |
1386 | qdisc_reset(parent->un.leaf.q); |
1387 | qdisc_tree_decrease_qlen(parent->un.leaf.q, qlen); | |
87990467 SH |
1388 | qdisc_destroy(parent->un.leaf.q); |
1389 | if (parent->prio_activity) | |
1390 | htb_deactivate(q, parent); | |
1da177e4 LT |
1391 | |
1392 | /* remove from evt list because of level change */ | |
1393 | if (parent->cmode != HTB_CAN_SEND) { | |
3696f625 | 1394 | htb_safe_rb_erase(&parent->pq_node, q->wait_pq); |
1da177e4 LT |
1395 | parent->cmode = HTB_CAN_SEND; |
1396 | } | |
1397 | parent->level = (parent->parent ? parent->parent->level | |
87990467 SH |
1398 | : TC_HTB_MAXDEPTH) - 1; |
1399 | memset(&parent->un.inner, 0, sizeof(parent->un.inner)); | |
1da177e4 LT |
1400 | } |
1401 | /* leaf (we) needs elementary qdisc */ | |
1402 | cl->un.leaf.q = new_q ? new_q : &noop_qdisc; | |
1403 | ||
f4c1f3e0 | 1404 | cl->common.classid = classid; |
87990467 | 1405 | cl->parent = parent; |
1da177e4 LT |
1406 | |
1407 | /* set class to be in HTB_CAN_SEND state */ | |
1408 | cl->tokens = hopt->buffer; | |
1409 | cl->ctokens = hopt->cbuffer; | |
00c04af9 | 1410 | cl->mbuffer = 60 * PSCHED_TICKS_PER_SEC; /* 1min */ |
3bebcda2 | 1411 | cl->t_c = psched_get_time(); |
1da177e4 LT |
1412 | cl->cmode = HTB_CAN_SEND; |
1413 | ||
1414 | /* attach to the hash list and parent's family */ | |
f4c1f3e0 | 1415 | qdisc_class_hash_insert(&q->clhash, &cl->common); |
42077599 PM |
1416 | if (parent) |
1417 | parent->children++; | |
ee39e10c | 1418 | } else { |
71bcb09a SH |
1419 | if (tca[TCA_RATE]) { |
1420 | err = gen_replace_estimator(&cl->bstats, &cl->rate_est, | |
1421 | qdisc_root_sleeping_lock(sch), | |
1422 | tca[TCA_RATE]); | |
1423 | if (err) | |
1424 | return err; | |
1425 | } | |
87990467 | 1426 | sch_tree_lock(sch); |
ee39e10c | 1427 | } |
1da177e4 LT |
1428 | |
1429 | /* it used to be a nasty bug here, we have to check that node | |
87990467 | 1430 | is really leaf before changing cl->un.leaf ! */ |
1da177e4 | 1431 | if (!cl->level) { |
c19f7a34 JP |
1432 | cl->quantum = rtab->rate.rate / q->rate2quantum; |
1433 | if (!hopt->quantum && cl->quantum < 1000) { | |
87990467 SH |
1434 | printk(KERN_WARNING |
1435 | "HTB: quantum of class %X is small. Consider r2q change.\n", | |
f4c1f3e0 | 1436 | cl->common.classid); |
c19f7a34 | 1437 | cl->quantum = 1000; |
1da177e4 | 1438 | } |
c19f7a34 | 1439 | if (!hopt->quantum && cl->quantum > 200000) { |
87990467 SH |
1440 | printk(KERN_WARNING |
1441 | "HTB: quantum of class %X is big. Consider r2q change.\n", | |
f4c1f3e0 | 1442 | cl->common.classid); |
c19f7a34 | 1443 | cl->quantum = 200000; |
1da177e4 LT |
1444 | } |
1445 | if (hopt->quantum) | |
c19f7a34 JP |
1446 | cl->quantum = hopt->quantum; |
1447 | if ((cl->prio = hopt->prio) >= TC_HTB_NUMPRIO) | |
1448 | cl->prio = TC_HTB_NUMPRIO - 1; | |
1da177e4 LT |
1449 | } |
1450 | ||
1451 | cl->buffer = hopt->buffer; | |
1452 | cl->cbuffer = hopt->cbuffer; | |
87990467 SH |
1453 | if (cl->rate) |
1454 | qdisc_put_rtab(cl->rate); | |
1455 | cl->rate = rtab; | |
1456 | if (cl->ceil) | |
1457 | qdisc_put_rtab(cl->ceil); | |
1458 | cl->ceil = ctab; | |
1da177e4 LT |
1459 | sch_tree_unlock(sch); |
1460 | ||
f4c1f3e0 PM |
1461 | qdisc_class_hash_grow(sch, &q->clhash); |
1462 | ||
1da177e4 LT |
1463 | *arg = (unsigned long)cl; |
1464 | return 0; | |
1465 | ||
1466 | failure: | |
87990467 SH |
1467 | if (rtab) |
1468 | qdisc_put_rtab(rtab); | |
1469 | if (ctab) | |
1470 | qdisc_put_rtab(ctab); | |
1da177e4 LT |
1471 | return err; |
1472 | } | |
1473 | ||
1474 | static struct tcf_proto **htb_find_tcf(struct Qdisc *sch, unsigned long arg) | |
1475 | { | |
1476 | struct htb_sched *q = qdisc_priv(sch); | |
1477 | struct htb_class *cl = (struct htb_class *)arg; | |
1478 | struct tcf_proto **fl = cl ? &cl->filter_list : &q->filter_list; | |
3bf72957 | 1479 | |
1da177e4 LT |
1480 | return fl; |
1481 | } | |
1482 | ||
1483 | static unsigned long htb_bind_filter(struct Qdisc *sch, unsigned long parent, | |
87990467 | 1484 | u32 classid) |
1da177e4 | 1485 | { |
87990467 | 1486 | struct htb_class *cl = htb_find(classid, sch); |
3bf72957 | 1487 | |
1da177e4 | 1488 | /*if (cl && !cl->level) return 0; |
87990467 SH |
1489 | The line above used to be there to prevent attaching filters to |
1490 | leaves. But at least tc_index filter uses this just to get class | |
1491 | for other reasons so that we have to allow for it. | |
1492 | ---- | |
1493 | 19.6.2002 As Werner explained it is ok - bind filter is just | |
1494 | another way to "lock" the class - unlike "get" this lock can | |
1495 | be broken by class during destroy IIUC. | |
1da177e4 | 1496 | */ |
87990467 SH |
1497 | if (cl) |
1498 | cl->filter_cnt++; | |
1da177e4 LT |
1499 | return (unsigned long)cl; |
1500 | } | |
1501 | ||
1502 | static void htb_unbind_filter(struct Qdisc *sch, unsigned long arg) | |
1503 | { | |
1da177e4 | 1504 | struct htb_class *cl = (struct htb_class *)arg; |
3bf72957 | 1505 | |
87990467 SH |
1506 | if (cl) |
1507 | cl->filter_cnt--; | |
1da177e4 LT |
1508 | } |
1509 | ||
1510 | static void htb_walk(struct Qdisc *sch, struct qdisc_walker *arg) | |
1511 | { | |
1512 | struct htb_sched *q = qdisc_priv(sch); | |
f4c1f3e0 PM |
1513 | struct htb_class *cl; |
1514 | struct hlist_node *n; | |
1515 | unsigned int i; | |
1da177e4 LT |
1516 | |
1517 | if (arg->stop) | |
1518 | return; | |
1519 | ||
f4c1f3e0 PM |
1520 | for (i = 0; i < q->clhash.hashsize; i++) { |
1521 | hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) { | |
1da177e4 LT |
1522 | if (arg->count < arg->skip) { |
1523 | arg->count++; | |
1524 | continue; | |
1525 | } | |
1526 | if (arg->fn(sch, (unsigned long)cl, arg) < 0) { | |
1527 | arg->stop = 1; | |
1528 | return; | |
1529 | } | |
1530 | arg->count++; | |
1531 | } | |
1532 | } | |
1533 | } | |
1534 | ||
20fea08b | 1535 | static const struct Qdisc_class_ops htb_class_ops = { |
1da177e4 LT |
1536 | .graft = htb_graft, |
1537 | .leaf = htb_leaf, | |
256d61b8 | 1538 | .qlen_notify = htb_qlen_notify, |
1da177e4 LT |
1539 | .get = htb_get, |
1540 | .put = htb_put, | |
1541 | .change = htb_change_class, | |
1542 | .delete = htb_delete, | |
1543 | .walk = htb_walk, | |
1544 | .tcf_chain = htb_find_tcf, | |
1545 | .bind_tcf = htb_bind_filter, | |
1546 | .unbind_tcf = htb_unbind_filter, | |
1547 | .dump = htb_dump_class, | |
1548 | .dump_stats = htb_dump_class_stats, | |
1549 | }; | |
1550 | ||
20fea08b | 1551 | static struct Qdisc_ops htb_qdisc_ops __read_mostly = { |
1da177e4 LT |
1552 | .next = NULL, |
1553 | .cl_ops = &htb_class_ops, | |
1554 | .id = "htb", | |
1555 | .priv_size = sizeof(struct htb_sched), | |
1556 | .enqueue = htb_enqueue, | |
1557 | .dequeue = htb_dequeue, | |
77be155c | 1558 | .peek = qdisc_peek_dequeued, |
1da177e4 LT |
1559 | .drop = htb_drop, |
1560 | .init = htb_init, | |
1561 | .reset = htb_reset, | |
1562 | .destroy = htb_destroy, | |
1563 | .change = NULL /* htb_change */, | |
1564 | .dump = htb_dump, | |
1565 | .owner = THIS_MODULE, | |
1566 | }; | |
1567 | ||
1568 | static int __init htb_module_init(void) | |
1569 | { | |
87990467 | 1570 | return register_qdisc(&htb_qdisc_ops); |
1da177e4 | 1571 | } |
87990467 | 1572 | static void __exit htb_module_exit(void) |
1da177e4 | 1573 | { |
87990467 | 1574 | unregister_qdisc(&htb_qdisc_ops); |
1da177e4 | 1575 | } |
87990467 | 1576 | |
1da177e4 LT |
1577 | module_init(htb_module_init) |
1578 | module_exit(htb_module_exit) | |
1579 | MODULE_LICENSE("GPL"); |