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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/sch_gred.c Generic Random Early Detection queue. | |
3 | * | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version | |
8 | * 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | * Authors: J Hadi Salim (hadi@cyberus.ca) 1998-2002 | |
11 | * | |
12 | * 991129: - Bug fix with grio mode | |
13 | * - a better sing. AvgQ mode with Grio(WRED) | |
14 | * - A finer grained VQ dequeue based on sugestion | |
15 | * from Ren Liu | |
16 | * - More error checks | |
17 | * | |
1e4dfaf9 | 18 | * For all the glorious comments look at include/net/red.h |
1da177e4 LT |
19 | */ |
20 | ||
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 | 22 | #include <linux/module.h> |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/kernel.h> | |
1da177e4 | 25 | #include <linux/skbuff.h> |
1da177e4 | 26 | #include <net/pkt_sched.h> |
22b33429 | 27 | #include <net/red.h> |
1da177e4 | 28 | |
f62d6b93 | 29 | #define GRED_DEF_PRIO (MAX_DPs / 2) |
716a1b40 | 30 | #define GRED_VQ_MASK (MAX_DPs - 1) |
f62d6b93 | 31 | |
1da177e4 LT |
32 | struct gred_sched_data; |
33 | struct gred_sched; | |
34 | ||
35 | struct gred_sched_data | |
36 | { | |
1da177e4 | 37 | u32 limit; /* HARD maximal queue length */ |
1da177e4 | 38 | u32 DP; /* the drop pramaters */ |
1da177e4 LT |
39 | u32 bytesin; /* bytes seen on virtualQ so far*/ |
40 | u32 packetsin; /* packets seen on virtualQ so far*/ | |
41 | u32 backlog; /* bytes on the virtualQ */ | |
1e4dfaf9 | 42 | u8 prio; /* the prio of this vq */ |
1da177e4 | 43 | |
22b33429 TG |
44 | struct red_parms parms; |
45 | struct red_stats stats; | |
1da177e4 LT |
46 | }; |
47 | ||
dea3f628 TG |
48 | enum { |
49 | GRED_WRED_MODE = 1, | |
d6fd4e96 | 50 | GRED_RIO_MODE, |
dea3f628 TG |
51 | }; |
52 | ||
1da177e4 LT |
53 | struct gred_sched |
54 | { | |
55 | struct gred_sched_data *tab[MAX_DPs]; | |
dea3f628 | 56 | unsigned long flags; |
b38c7eef | 57 | u32 red_flags; |
1e4dfaf9 TG |
58 | u32 DPs; |
59 | u32 def; | |
7051703b | 60 | struct red_parms wred_set; |
1da177e4 LT |
61 | }; |
62 | ||
dea3f628 TG |
63 | static inline int gred_wred_mode(struct gred_sched *table) |
64 | { | |
65 | return test_bit(GRED_WRED_MODE, &table->flags); | |
66 | } | |
67 | ||
68 | static inline void gred_enable_wred_mode(struct gred_sched *table) | |
69 | { | |
70 | __set_bit(GRED_WRED_MODE, &table->flags); | |
71 | } | |
72 | ||
73 | static inline void gred_disable_wred_mode(struct gred_sched *table) | |
74 | { | |
75 | __clear_bit(GRED_WRED_MODE, &table->flags); | |
76 | } | |
77 | ||
d6fd4e96 TG |
78 | static inline int gred_rio_mode(struct gred_sched *table) |
79 | { | |
80 | return test_bit(GRED_RIO_MODE, &table->flags); | |
81 | } | |
82 | ||
83 | static inline void gred_enable_rio_mode(struct gred_sched *table) | |
84 | { | |
85 | __set_bit(GRED_RIO_MODE, &table->flags); | |
86 | } | |
87 | ||
88 | static inline void gred_disable_rio_mode(struct gred_sched *table) | |
89 | { | |
90 | __clear_bit(GRED_RIO_MODE, &table->flags); | |
91 | } | |
92 | ||
dea3f628 TG |
93 | static inline int gred_wred_mode_check(struct Qdisc *sch) |
94 | { | |
95 | struct gred_sched *table = qdisc_priv(sch); | |
96 | int i; | |
97 | ||
98 | /* Really ugly O(n^2) but shouldn't be necessary too frequent. */ | |
99 | for (i = 0; i < table->DPs; i++) { | |
100 | struct gred_sched_data *q = table->tab[i]; | |
101 | int n; | |
102 | ||
103 | if (q == NULL) | |
104 | continue; | |
105 | ||
106 | for (n = 0; n < table->DPs; n++) | |
107 | if (table->tab[n] && table->tab[n] != q && | |
108 | table->tab[n]->prio == q->prio) | |
109 | return 1; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
22b33429 TG |
115 | static inline unsigned int gred_backlog(struct gred_sched *table, |
116 | struct gred_sched_data *q, | |
117 | struct Qdisc *sch) | |
118 | { | |
119 | if (gred_wred_mode(table)) | |
120 | return sch->qstats.backlog; | |
121 | else | |
122 | return q->backlog; | |
123 | } | |
124 | ||
716a1b40 TG |
125 | static inline u16 tc_index_to_dp(struct sk_buff *skb) |
126 | { | |
127 | return skb->tc_index & GRED_VQ_MASK; | |
128 | } | |
129 | ||
7051703b TG |
130 | static inline void gred_load_wred_set(struct gred_sched *table, |
131 | struct gred_sched_data *q) | |
132 | { | |
133 | q->parms.qavg = table->wred_set.qavg; | |
134 | q->parms.qidlestart = table->wred_set.qidlestart; | |
135 | } | |
136 | ||
137 | static inline void gred_store_wred_set(struct gred_sched *table, | |
138 | struct gred_sched_data *q) | |
139 | { | |
140 | table->wred_set.qavg = q->parms.qavg; | |
141 | } | |
142 | ||
b38c7eef TG |
143 | static inline int gred_use_ecn(struct gred_sched *t) |
144 | { | |
145 | return t->red_flags & TC_RED_ECN; | |
146 | } | |
147 | ||
bdc450a0 TG |
148 | static inline int gred_use_harddrop(struct gred_sched *t) |
149 | { | |
150 | return t->red_flags & TC_RED_HARDDROP; | |
151 | } | |
152 | ||
1e4dfaf9 | 153 | static int gred_enqueue(struct sk_buff *skb, struct Qdisc* sch) |
1da177e4 | 154 | { |
1da177e4 LT |
155 | struct gred_sched_data *q=NULL; |
156 | struct gred_sched *t= qdisc_priv(sch); | |
22b33429 | 157 | unsigned long qavg = 0; |
4a591834 | 158 | u16 dp = tc_index_to_dp(skb); |
1da177e4 | 159 | |
716a1b40 | 160 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { |
18e3fb84 TG |
161 | dp = t->def; |
162 | ||
163 | if ((q = t->tab[dp]) == NULL) { | |
164 | /* Pass through packets not assigned to a DP | |
165 | * if no default DP has been configured. This | |
166 | * allows for DP flows to be left untouched. | |
167 | */ | |
5ce2d488 | 168 | if (skb_queue_len(&sch->q) < qdisc_dev(sch)->tx_queue_len) |
18e3fb84 TG |
169 | return qdisc_enqueue_tail(skb, sch); |
170 | else | |
171 | goto drop; | |
1da177e4 | 172 | } |
18e3fb84 | 173 | |
1da177e4 LT |
174 | /* fix tc_index? --could be controvesial but needed for |
175 | requeueing */ | |
18e3fb84 | 176 | skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp; |
1da177e4 LT |
177 | } |
178 | ||
1e4dfaf9 | 179 | /* sum up all the qaves of prios <= to ours to get the new qave */ |
d6fd4e96 | 180 | if (!gred_wred_mode(t) && gred_rio_mode(t)) { |
1e4dfaf9 TG |
181 | int i; |
182 | ||
183 | for (i = 0; i < t->DPs; i++) { | |
184 | if (t->tab[i] && t->tab[i]->prio < q->prio && | |
22b33429 TG |
185 | !red_is_idling(&t->tab[i]->parms)) |
186 | qavg +=t->tab[i]->parms.qavg; | |
1da177e4 | 187 | } |
1e4dfaf9 | 188 | |
1da177e4 LT |
189 | } |
190 | ||
191 | q->packetsin++; | |
0abf77e5 | 192 | q->bytesin += qdisc_pkt_len(skb); |
1da177e4 | 193 | |
1e4dfaf9 | 194 | if (gred_wred_mode(t)) |
7051703b | 195 | gred_load_wred_set(t, q); |
1da177e4 | 196 | |
22b33429 | 197 | q->parms.qavg = red_calc_qavg(&q->parms, gred_backlog(t, q, sch)); |
1da177e4 | 198 | |
22b33429 TG |
199 | if (red_is_idling(&q->parms)) |
200 | red_end_of_idle_period(&q->parms); | |
1da177e4 | 201 | |
dea3f628 | 202 | if (gred_wred_mode(t)) |
7051703b | 203 | gred_store_wred_set(t, q); |
1da177e4 | 204 | |
22b33429 TG |
205 | switch (red_action(&q->parms, q->parms.qavg + qavg)) { |
206 | case RED_DONT_MARK: | |
207 | break; | |
1da177e4 | 208 | |
22b33429 TG |
209 | case RED_PROB_MARK: |
210 | sch->qstats.overlimits++; | |
b38c7eef TG |
211 | if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) { |
212 | q->stats.prob_drop++; | |
213 | goto congestion_drop; | |
214 | } | |
215 | ||
216 | q->stats.prob_mark++; | |
217 | break; | |
22b33429 TG |
218 | |
219 | case RED_HARD_MARK: | |
220 | sch->qstats.overlimits++; | |
bdc450a0 TG |
221 | if (gred_use_harddrop(t) || !gred_use_ecn(t) || |
222 | !INET_ECN_set_ce(skb)) { | |
b38c7eef TG |
223 | q->stats.forced_drop++; |
224 | goto congestion_drop; | |
225 | } | |
226 | q->stats.forced_mark++; | |
227 | break; | |
1da177e4 | 228 | } |
22b33429 | 229 | |
0abf77e5 JK |
230 | if (q->backlog + qdisc_pkt_len(skb) <= q->limit) { |
231 | q->backlog += qdisc_pkt_len(skb); | |
edf7a7b1 | 232 | return qdisc_enqueue_tail(skb, sch); |
1da177e4 | 233 | } |
22b33429 TG |
234 | |
235 | q->stats.pdrop++; | |
236 | drop: | |
edf7a7b1 | 237 | return qdisc_drop(skb, sch); |
c3b553cd TG |
238 | |
239 | congestion_drop: | |
edf7a7b1 | 240 | qdisc_drop(skb, sch); |
c3b553cd | 241 | return NET_XMIT_CN; |
1da177e4 LT |
242 | } |
243 | ||
1e4dfaf9 | 244 | static struct sk_buff *gred_dequeue(struct Qdisc* sch) |
1da177e4 LT |
245 | { |
246 | struct sk_buff *skb; | |
1e4dfaf9 | 247 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 248 | |
edf7a7b1 TG |
249 | skb = qdisc_dequeue_head(sch); |
250 | ||
1da177e4 | 251 | if (skb) { |
1e4dfaf9 | 252 | struct gred_sched_data *q; |
18e3fb84 TG |
253 | u16 dp = tc_index_to_dp(skb); |
254 | ||
255 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { | |
256 | if (net_ratelimit()) | |
257 | printk(KERN_WARNING "GRED: Unable to relocate " | |
258 | "VQ 0x%x after dequeue, screwing up " | |
259 | "backlog.\n", tc_index_to_dp(skb)); | |
260 | } else { | |
0abf77e5 | 261 | q->backlog -= qdisc_pkt_len(skb); |
18e3fb84 | 262 | |
dea3f628 | 263 | if (!q->backlog && !gred_wred_mode(t)) |
22b33429 | 264 | red_start_of_idle_period(&q->parms); |
1da177e4 | 265 | } |
18e3fb84 | 266 | |
1da177e4 LT |
267 | return skb; |
268 | } | |
269 | ||
d8f64e19 | 270 | if (gred_wred_mode(t) && !red_is_idling(&t->wred_set)) |
7051703b | 271 | red_start_of_idle_period(&t->wred_set); |
1da177e4 LT |
272 | |
273 | return NULL; | |
274 | } | |
275 | ||
276 | static unsigned int gred_drop(struct Qdisc* sch) | |
277 | { | |
278 | struct sk_buff *skb; | |
1e4dfaf9 | 279 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 280 | |
edf7a7b1 | 281 | skb = qdisc_dequeue_tail(sch); |
1da177e4 | 282 | if (skb) { |
0abf77e5 | 283 | unsigned int len = qdisc_pkt_len(skb); |
1e4dfaf9 | 284 | struct gred_sched_data *q; |
18e3fb84 TG |
285 | u16 dp = tc_index_to_dp(skb); |
286 | ||
287 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { | |
288 | if (net_ratelimit()) | |
289 | printk(KERN_WARNING "GRED: Unable to relocate " | |
290 | "VQ 0x%x while dropping, screwing up " | |
291 | "backlog.\n", tc_index_to_dp(skb)); | |
292 | } else { | |
1da177e4 | 293 | q->backlog -= len; |
22b33429 | 294 | q->stats.other++; |
18e3fb84 | 295 | |
dea3f628 | 296 | if (!q->backlog && !gred_wred_mode(t)) |
22b33429 | 297 | red_start_of_idle_period(&q->parms); |
1da177e4 LT |
298 | } |
299 | ||
edf7a7b1 | 300 | qdisc_drop(skb, sch); |
1da177e4 LT |
301 | return len; |
302 | } | |
303 | ||
d8f64e19 | 304 | if (gred_wred_mode(t) && !red_is_idling(&t->wred_set)) |
7051703b | 305 | red_start_of_idle_period(&t->wred_set); |
1da177e4 | 306 | |
1da177e4 LT |
307 | return 0; |
308 | ||
309 | } | |
310 | ||
311 | static void gred_reset(struct Qdisc* sch) | |
312 | { | |
313 | int i; | |
1e4dfaf9 | 314 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 315 | |
edf7a7b1 | 316 | qdisc_reset_queue(sch); |
1da177e4 | 317 | |
10297b99 | 318 | for (i = 0; i < t->DPs; i++) { |
1e4dfaf9 TG |
319 | struct gred_sched_data *q = t->tab[i]; |
320 | ||
321 | if (!q) | |
322 | continue; | |
323 | ||
22b33429 | 324 | red_restart(&q->parms); |
1da177e4 | 325 | q->backlog = 0; |
1da177e4 LT |
326 | } |
327 | } | |
328 | ||
6639607e TG |
329 | static inline void gred_destroy_vq(struct gred_sched_data *q) |
330 | { | |
331 | kfree(q); | |
332 | } | |
333 | ||
1e90474c | 334 | static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps) |
1da177e4 LT |
335 | { |
336 | struct gred_sched *table = qdisc_priv(sch); | |
1da177e4 | 337 | struct tc_gred_sopt *sopt; |
6639607e | 338 | int i; |
1da177e4 | 339 | |
27a3421e | 340 | if (dps == NULL) |
1da177e4 LT |
341 | return -EINVAL; |
342 | ||
1e90474c | 343 | sopt = nla_data(dps); |
1da177e4 | 344 | |
6639607e TG |
345 | if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs) |
346 | return -EINVAL; | |
1da177e4 | 347 | |
6639607e TG |
348 | sch_tree_lock(sch); |
349 | table->DPs = sopt->DPs; | |
350 | table->def = sopt->def_DP; | |
b38c7eef | 351 | table->red_flags = sopt->flags; |
dea3f628 | 352 | |
6639607e TG |
353 | /* |
354 | * Every entry point to GRED is synchronized with the above code | |
355 | * and the DP is checked against DPs, i.e. shadowed VQs can no | |
356 | * longer be found so we can unlock right here. | |
357 | */ | |
358 | sch_tree_unlock(sch); | |
dea3f628 | 359 | |
6639607e TG |
360 | if (sopt->grio) { |
361 | gred_enable_rio_mode(table); | |
362 | gred_disable_wred_mode(table); | |
363 | if (gred_wred_mode_check(sch)) | |
364 | gred_enable_wred_mode(table); | |
365 | } else { | |
366 | gred_disable_rio_mode(table); | |
367 | gred_disable_wred_mode(table); | |
368 | } | |
369 | ||
370 | for (i = table->DPs; i < MAX_DPs; i++) { | |
371 | if (table->tab[i]) { | |
372 | printk(KERN_WARNING "GRED: Warning: Destroying " | |
373 | "shadowed VQ 0x%x\n", i); | |
374 | gred_destroy_vq(table->tab[i]); | |
375 | table->tab[i] = NULL; | |
10297b99 | 376 | } |
6639607e | 377 | } |
1da177e4 | 378 | |
6639607e TG |
379 | return 0; |
380 | } | |
381 | ||
f62d6b93 TG |
382 | static inline int gred_change_vq(struct Qdisc *sch, int dp, |
383 | struct tc_gred_qopt *ctl, int prio, u8 *stab) | |
6639607e TG |
384 | { |
385 | struct gred_sched *table = qdisc_priv(sch); | |
386 | struct gred_sched_data *q; | |
f62d6b93 TG |
387 | |
388 | if (table->tab[dp] == NULL) { | |
0da974f4 | 389 | table->tab[dp] = kzalloc(sizeof(*q), GFP_KERNEL); |
f62d6b93 TG |
390 | if (table->tab[dp] == NULL) |
391 | return -ENOMEM; | |
f62d6b93 TG |
392 | } |
393 | ||
394 | q = table->tab[dp]; | |
395 | q->DP = dp; | |
396 | q->prio = prio; | |
f62d6b93 | 397 | q->limit = ctl->limit; |
22b33429 TG |
398 | |
399 | if (q->backlog == 0) | |
400 | red_end_of_idle_period(&q->parms); | |
401 | ||
402 | red_set_parms(&q->parms, | |
403 | ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, | |
404 | ctl->Scell_log, stab); | |
405 | ||
f62d6b93 TG |
406 | return 0; |
407 | } | |
408 | ||
27a3421e PM |
409 | static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = { |
410 | [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) }, | |
411 | [TCA_GRED_STAB] = { .len = 256 }, | |
412 | [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) }, | |
413 | }; | |
414 | ||
1e90474c | 415 | static int gred_change(struct Qdisc *sch, struct nlattr *opt) |
f62d6b93 TG |
416 | { |
417 | struct gred_sched *table = qdisc_priv(sch); | |
6639607e | 418 | struct tc_gred_qopt *ctl; |
1e90474c | 419 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 420 | int err, prio = GRED_DEF_PRIO; |
f62d6b93 | 421 | u8 *stab; |
6639607e | 422 | |
cee63723 | 423 | if (opt == NULL) |
6639607e TG |
424 | return -EINVAL; |
425 | ||
27a3421e | 426 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
cee63723 PM |
427 | if (err < 0) |
428 | return err; | |
429 | ||
1e90474c | 430 | if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) |
f62d6b93 | 431 | return gred_change_table_def(sch, opt); |
1da177e4 | 432 | |
1e90474c | 433 | if (tb[TCA_GRED_PARMS] == NULL || |
27a3421e | 434 | tb[TCA_GRED_STAB] == NULL) |
f62d6b93 | 435 | return -EINVAL; |
1da177e4 | 436 | |
cee63723 | 437 | err = -EINVAL; |
1e90474c PM |
438 | ctl = nla_data(tb[TCA_GRED_PARMS]); |
439 | stab = nla_data(tb[TCA_GRED_STAB]); | |
a8aaa995 TG |
440 | |
441 | if (ctl->DP >= table->DPs) | |
f62d6b93 | 442 | goto errout; |
1da177e4 | 443 | |
d6fd4e96 | 444 | if (gred_rio_mode(table)) { |
f62d6b93 TG |
445 | if (ctl->prio == 0) { |
446 | int def_prio = GRED_DEF_PRIO; | |
447 | ||
448 | if (table->tab[table->def]) | |
449 | def_prio = table->tab[table->def]->prio; | |
450 | ||
451 | printk(KERN_DEBUG "GRED: DP %u does not have a prio " | |
452 | "setting default to %d\n", ctl->DP, def_prio); | |
453 | ||
454 | prio = def_prio; | |
455 | } else | |
456 | prio = ctl->prio; | |
1da177e4 LT |
457 | } |
458 | ||
f62d6b93 | 459 | sch_tree_lock(sch); |
1da177e4 | 460 | |
f62d6b93 TG |
461 | err = gred_change_vq(sch, ctl->DP, ctl, prio, stab); |
462 | if (err < 0) | |
463 | goto errout_locked; | |
1da177e4 | 464 | |
d6fd4e96 | 465 | if (gred_rio_mode(table)) { |
dea3f628 TG |
466 | gred_disable_wred_mode(table); |
467 | if (gred_wred_mode_check(sch)) | |
468 | gred_enable_wred_mode(table); | |
1da177e4 LT |
469 | } |
470 | ||
f62d6b93 | 471 | err = 0; |
1da177e4 | 472 | |
f62d6b93 TG |
473 | errout_locked: |
474 | sch_tree_unlock(sch); | |
475 | errout: | |
476 | return err; | |
1da177e4 LT |
477 | } |
478 | ||
1e90474c | 479 | static int gred_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 480 | { |
1e90474c | 481 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 482 | int err; |
1da177e4 | 483 | |
cee63723 | 484 | if (opt == NULL) |
1da177e4 LT |
485 | return -EINVAL; |
486 | ||
27a3421e | 487 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
cee63723 PM |
488 | if (err < 0) |
489 | return err; | |
490 | ||
1e90474c | 491 | if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) |
6639607e | 492 | return -EINVAL; |
1da177e4 | 493 | |
1e90474c | 494 | return gred_change_table_def(sch, tb[TCA_GRED_DPS]); |
1da177e4 LT |
495 | } |
496 | ||
497 | static int gred_dump(struct Qdisc *sch, struct sk_buff *skb) | |
498 | { | |
1da177e4 | 499 | struct gred_sched *table = qdisc_priv(sch); |
1e90474c | 500 | struct nlattr *parms, *opts = NULL; |
1da177e4 | 501 | int i; |
e0636822 TG |
502 | struct tc_gred_sopt sopt = { |
503 | .DPs = table->DPs, | |
504 | .def_DP = table->def, | |
505 | .grio = gred_rio_mode(table), | |
b38c7eef | 506 | .flags = table->red_flags, |
e0636822 | 507 | }; |
1da177e4 | 508 | |
1e90474c PM |
509 | opts = nla_nest_start(skb, TCA_OPTIONS); |
510 | if (opts == NULL) | |
511 | goto nla_put_failure; | |
512 | NLA_PUT(skb, TCA_GRED_DPS, sizeof(sopt), &sopt); | |
513 | parms = nla_nest_start(skb, TCA_GRED_PARMS); | |
514 | if (parms == NULL) | |
515 | goto nla_put_failure; | |
1da177e4 | 516 | |
05f1cc01 TG |
517 | for (i = 0; i < MAX_DPs; i++) { |
518 | struct gred_sched_data *q = table->tab[i]; | |
519 | struct tc_gred_qopt opt; | |
1da177e4 | 520 | |
05f1cc01 | 521 | memset(&opt, 0, sizeof(opt)); |
1da177e4 LT |
522 | |
523 | if (!q) { | |
524 | /* hack -- fix at some point with proper message | |
525 | This is how we indicate to tc that there is no VQ | |
526 | at this DP */ | |
527 | ||
05f1cc01 TG |
528 | opt.DP = MAX_DPs + i; |
529 | goto append_opt; | |
1da177e4 LT |
530 | } |
531 | ||
05f1cc01 TG |
532 | opt.limit = q->limit; |
533 | opt.DP = q->DP; | |
534 | opt.backlog = q->backlog; | |
535 | opt.prio = q->prio; | |
22b33429 TG |
536 | opt.qth_min = q->parms.qth_min >> q->parms.Wlog; |
537 | opt.qth_max = q->parms.qth_max >> q->parms.Wlog; | |
538 | opt.Wlog = q->parms.Wlog; | |
539 | opt.Plog = q->parms.Plog; | |
540 | opt.Scell_log = q->parms.Scell_log; | |
541 | opt.other = q->stats.other; | |
542 | opt.early = q->stats.prob_drop; | |
543 | opt.forced = q->stats.forced_drop; | |
544 | opt.pdrop = q->stats.pdrop; | |
05f1cc01 TG |
545 | opt.packets = q->packetsin; |
546 | opt.bytesin = q->bytesin; | |
547 | ||
22b33429 TG |
548 | if (gred_wred_mode(table)) { |
549 | q->parms.qidlestart = | |
550 | table->tab[table->def]->parms.qidlestart; | |
551 | q->parms.qavg = table->tab[table->def]->parms.qavg; | |
1da177e4 | 552 | } |
05f1cc01 | 553 | |
22b33429 TG |
554 | opt.qave = red_calc_qavg(&q->parms, q->parms.qavg); |
555 | ||
05f1cc01 | 556 | append_opt: |
1e90474c PM |
557 | if (nla_append(skb, sizeof(opt), &opt) < 0) |
558 | goto nla_put_failure; | |
1da177e4 LT |
559 | } |
560 | ||
1e90474c | 561 | nla_nest_end(skb, parms); |
1da177e4 | 562 | |
1e90474c | 563 | return nla_nest_end(skb, opts); |
1da177e4 | 564 | |
1e90474c | 565 | nla_put_failure: |
bc3ed28c TG |
566 | nla_nest_cancel(skb, opts); |
567 | return -EMSGSIZE; | |
1da177e4 LT |
568 | } |
569 | ||
570 | static void gred_destroy(struct Qdisc *sch) | |
571 | { | |
572 | struct gred_sched *table = qdisc_priv(sch); | |
573 | int i; | |
574 | ||
1e4dfaf9 | 575 | for (i = 0; i < table->DPs; i++) { |
1da177e4 | 576 | if (table->tab[i]) |
6639607e | 577 | gred_destroy_vq(table->tab[i]); |
1da177e4 LT |
578 | } |
579 | } | |
580 | ||
20fea08b | 581 | static struct Qdisc_ops gred_qdisc_ops __read_mostly = { |
1da177e4 LT |
582 | .id = "gred", |
583 | .priv_size = sizeof(struct gred_sched), | |
584 | .enqueue = gred_enqueue, | |
585 | .dequeue = gred_dequeue, | |
8e3af978 | 586 | .peek = qdisc_peek_head, |
1da177e4 LT |
587 | .drop = gred_drop, |
588 | .init = gred_init, | |
589 | .reset = gred_reset, | |
590 | .destroy = gred_destroy, | |
591 | .change = gred_change, | |
592 | .dump = gred_dump, | |
593 | .owner = THIS_MODULE, | |
594 | }; | |
595 | ||
596 | static int __init gred_module_init(void) | |
597 | { | |
598 | return register_qdisc(&gred_qdisc_ops); | |
599 | } | |
1e4dfaf9 TG |
600 | |
601 | static void __exit gred_module_exit(void) | |
1da177e4 LT |
602 | { |
603 | unregister_qdisc(&gred_qdisc_ops); | |
604 | } | |
1e4dfaf9 | 605 | |
1da177e4 LT |
606 | module_init(gred_module_init) |
607 | module_exit(gred_module_exit) | |
1e4dfaf9 | 608 | |
1da177e4 | 609 | MODULE_LICENSE("GPL"); |