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 | ||
cc7ec456 | 35 | struct gred_sched_data { |
1da177e4 | 36 | u32 limit; /* HARD maximal queue length */ |
a73ed26b | 37 | u32 DP; /* the drop parameters */ |
1da177e4 LT |
38 | u32 bytesin; /* bytes seen on virtualQ so far*/ |
39 | u32 packetsin; /* packets seen on virtualQ so far*/ | |
40 | u32 backlog; /* bytes on the virtualQ */ | |
1e4dfaf9 | 41 | u8 prio; /* the prio of this vq */ |
1da177e4 | 42 | |
22b33429 | 43 | struct red_parms parms; |
eeca6688 | 44 | struct red_vars vars; |
22b33429 | 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 | ||
cc7ec456 | 53 | struct gred_sched { |
1da177e4 | 54 | struct gred_sched_data *tab[MAX_DPs]; |
dea3f628 | 55 | unsigned long flags; |
b38c7eef | 56 | u32 red_flags; |
1e4dfaf9 TG |
57 | u32 DPs; |
58 | u32 def; | |
eeca6688 | 59 | struct red_vars wred_set; |
1da177e4 LT |
60 | }; |
61 | ||
dea3f628 TG |
62 | static inline int gred_wred_mode(struct gred_sched *table) |
63 | { | |
64 | return test_bit(GRED_WRED_MODE, &table->flags); | |
65 | } | |
66 | ||
67 | static inline void gred_enable_wred_mode(struct gred_sched *table) | |
68 | { | |
69 | __set_bit(GRED_WRED_MODE, &table->flags); | |
70 | } | |
71 | ||
72 | static inline void gred_disable_wred_mode(struct gred_sched *table) | |
73 | { | |
74 | __clear_bit(GRED_WRED_MODE, &table->flags); | |
75 | } | |
76 | ||
d6fd4e96 TG |
77 | static inline int gred_rio_mode(struct gred_sched *table) |
78 | { | |
79 | return test_bit(GRED_RIO_MODE, &table->flags); | |
80 | } | |
81 | ||
82 | static inline void gred_enable_rio_mode(struct gred_sched *table) | |
83 | { | |
84 | __set_bit(GRED_RIO_MODE, &table->flags); | |
85 | } | |
86 | ||
87 | static inline void gred_disable_rio_mode(struct gred_sched *table) | |
88 | { | |
89 | __clear_bit(GRED_RIO_MODE, &table->flags); | |
90 | } | |
91 | ||
dea3f628 TG |
92 | static inline int gred_wred_mode_check(struct Qdisc *sch) |
93 | { | |
94 | struct gred_sched *table = qdisc_priv(sch); | |
95 | int i; | |
96 | ||
97 | /* Really ugly O(n^2) but shouldn't be necessary too frequent. */ | |
98 | for (i = 0; i < table->DPs; i++) { | |
99 | struct gred_sched_data *q = table->tab[i]; | |
100 | int n; | |
101 | ||
102 | if (q == NULL) | |
103 | continue; | |
104 | ||
c22e4640 DW |
105 | for (n = i + 1; n < table->DPs; n++) |
106 | if (table->tab[n] && table->tab[n]->prio == q->prio) | |
dea3f628 TG |
107 | return 1; |
108 | } | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
22b33429 TG |
113 | static inline unsigned int gred_backlog(struct gred_sched *table, |
114 | struct gred_sched_data *q, | |
115 | struct Qdisc *sch) | |
116 | { | |
117 | if (gred_wred_mode(table)) | |
118 | return sch->qstats.backlog; | |
119 | else | |
120 | return q->backlog; | |
121 | } | |
122 | ||
716a1b40 TG |
123 | static inline u16 tc_index_to_dp(struct sk_buff *skb) |
124 | { | |
125 | return skb->tc_index & GRED_VQ_MASK; | |
126 | } | |
127 | ||
eeca6688 | 128 | static inline void gred_load_wred_set(const struct gred_sched *table, |
7051703b TG |
129 | struct gred_sched_data *q) |
130 | { | |
eeca6688 ED |
131 | q->vars.qavg = table->wred_set.qavg; |
132 | q->vars.qidlestart = table->wred_set.qidlestart; | |
7051703b TG |
133 | } |
134 | ||
135 | static inline void gred_store_wred_set(struct gred_sched *table, | |
136 | struct gred_sched_data *q) | |
137 | { | |
eeca6688 | 138 | table->wred_set.qavg = q->vars.qavg; |
ba1bf474 | 139 | table->wred_set.qidlestart = q->vars.qidlestart; |
7051703b TG |
140 | } |
141 | ||
b38c7eef TG |
142 | static inline int gred_use_ecn(struct gred_sched *t) |
143 | { | |
144 | return t->red_flags & TC_RED_ECN; | |
145 | } | |
146 | ||
bdc450a0 TG |
147 | static inline int gred_use_harddrop(struct gred_sched *t) |
148 | { | |
149 | return t->red_flags & TC_RED_HARDDROP; | |
150 | } | |
151 | ||
cc7ec456 | 152 | static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
1da177e4 | 153 | { |
cc7ec456 ED |
154 | struct gred_sched_data *q = NULL; |
155 | struct gred_sched *t = qdisc_priv(sch); | |
22b33429 | 156 | unsigned long qavg = 0; |
4a591834 | 157 | u16 dp = tc_index_to_dp(skb); |
1da177e4 | 158 | |
cc7ec456 | 159 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { |
18e3fb84 TG |
160 | dp = t->def; |
161 | ||
cc7ec456 ED |
162 | q = t->tab[dp]; |
163 | if (!q) { | |
18e3fb84 TG |
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 | |
eeca6688 | 174 | /* fix tc_index? --could be controversial but needed for |
1da177e4 | 175 | requeueing */ |
18e3fb84 | 176 | skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp; |
1da177e4 LT |
177 | } |
178 | ||
e29fe837 | 179 | /* sum up all the qaves of prios < 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 && | |
eeca6688 ED |
185 | !red_is_idling(&t->tab[i]->vars)) |
186 | qavg += t->tab[i]->vars.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 | |
eeca6688 ED |
197 | q->vars.qavg = red_calc_qavg(&q->parms, |
198 | &q->vars, | |
199 | gred_backlog(t, q, sch)); | |
1da177e4 | 200 | |
eeca6688 ED |
201 | if (red_is_idling(&q->vars)) |
202 | red_end_of_idle_period(&q->vars); | |
1da177e4 | 203 | |
dea3f628 | 204 | if (gred_wred_mode(t)) |
7051703b | 205 | gred_store_wred_set(t, q); |
1da177e4 | 206 | |
eeca6688 | 207 | switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) { |
cc7ec456 ED |
208 | case RED_DONT_MARK: |
209 | break; | |
210 | ||
211 | case RED_PROB_MARK: | |
25331d6c | 212 | qdisc_qstats_overlimit(sch); |
cc7ec456 ED |
213 | if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) { |
214 | q->stats.prob_drop++; | |
215 | goto congestion_drop; | |
216 | } | |
217 | ||
218 | q->stats.prob_mark++; | |
219 | break; | |
220 | ||
221 | case RED_HARD_MARK: | |
25331d6c | 222 | qdisc_qstats_overlimit(sch); |
cc7ec456 ED |
223 | if (gred_use_harddrop(t) || !gred_use_ecn(t) || |
224 | !INET_ECN_set_ce(skb)) { | |
225 | q->stats.forced_drop++; | |
226 | goto congestion_drop; | |
227 | } | |
228 | q->stats.forced_mark++; | |
229 | break; | |
1da177e4 | 230 | } |
22b33429 | 231 | |
0abf77e5 JK |
232 | if (q->backlog + qdisc_pkt_len(skb) <= q->limit) { |
233 | q->backlog += qdisc_pkt_len(skb); | |
edf7a7b1 | 234 | return qdisc_enqueue_tail(skb, sch); |
1da177e4 | 235 | } |
22b33429 TG |
236 | |
237 | q->stats.pdrop++; | |
238 | drop: | |
edf7a7b1 | 239 | return qdisc_drop(skb, sch); |
c3b553cd TG |
240 | |
241 | congestion_drop: | |
edf7a7b1 | 242 | qdisc_drop(skb, sch); |
c3b553cd | 243 | return NET_XMIT_CN; |
1da177e4 LT |
244 | } |
245 | ||
cc7ec456 | 246 | static struct sk_buff *gred_dequeue(struct Qdisc *sch) |
1da177e4 LT |
247 | { |
248 | struct sk_buff *skb; | |
1e4dfaf9 | 249 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 250 | |
edf7a7b1 TG |
251 | skb = qdisc_dequeue_head(sch); |
252 | ||
1da177e4 | 253 | if (skb) { |
1e4dfaf9 | 254 | struct gred_sched_data *q; |
18e3fb84 TG |
255 | u16 dp = tc_index_to_dp(skb); |
256 | ||
257 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { | |
e87cc472 JP |
258 | net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x after dequeue, screwing up backlog\n", |
259 | tc_index_to_dp(skb)); | |
18e3fb84 | 260 | } else { |
0abf77e5 | 261 | q->backlog -= qdisc_pkt_len(skb); |
18e3fb84 | 262 | |
ba1bf474 DW |
263 | if (gred_wred_mode(t)) { |
264 | if (!sch->qstats.backlog) | |
265 | red_start_of_idle_period(&t->wred_set); | |
266 | } else { | |
267 | if (!q->backlog) | |
268 | red_start_of_idle_period(&q->vars); | |
269 | } | |
1da177e4 | 270 | } |
18e3fb84 | 271 | |
1da177e4 LT |
272 | return skb; |
273 | } | |
274 | ||
1da177e4 LT |
275 | return NULL; |
276 | } | |
277 | ||
cc7ec456 | 278 | static unsigned int gred_drop(struct Qdisc *sch) |
1da177e4 LT |
279 | { |
280 | struct sk_buff *skb; | |
1e4dfaf9 | 281 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 282 | |
edf7a7b1 | 283 | skb = qdisc_dequeue_tail(sch); |
1da177e4 | 284 | if (skb) { |
0abf77e5 | 285 | unsigned int len = qdisc_pkt_len(skb); |
1e4dfaf9 | 286 | struct gred_sched_data *q; |
18e3fb84 TG |
287 | u16 dp = tc_index_to_dp(skb); |
288 | ||
289 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { | |
e87cc472 JP |
290 | net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x while dropping, screwing up backlog\n", |
291 | tc_index_to_dp(skb)); | |
18e3fb84 | 292 | } else { |
1da177e4 | 293 | q->backlog -= len; |
22b33429 | 294 | q->stats.other++; |
18e3fb84 | 295 | |
ba1bf474 DW |
296 | if (gred_wred_mode(t)) { |
297 | if (!sch->qstats.backlog) | |
298 | red_start_of_idle_period(&t->wred_set); | |
299 | } else { | |
300 | if (!q->backlog) | |
301 | red_start_of_idle_period(&q->vars); | |
302 | } | |
1da177e4 LT |
303 | } |
304 | ||
edf7a7b1 | 305 | qdisc_drop(skb, sch); |
1da177e4 LT |
306 | return len; |
307 | } | |
308 | ||
1da177e4 | 309 | return 0; |
1da177e4 LT |
310 | } |
311 | ||
cc7ec456 | 312 | static void gred_reset(struct Qdisc *sch) |
1da177e4 LT |
313 | { |
314 | int i; | |
1e4dfaf9 | 315 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 316 | |
edf7a7b1 | 317 | qdisc_reset_queue(sch); |
1da177e4 | 318 | |
10297b99 | 319 | for (i = 0; i < t->DPs; i++) { |
1e4dfaf9 TG |
320 | struct gred_sched_data *q = t->tab[i]; |
321 | ||
322 | if (!q) | |
323 | continue; | |
324 | ||
eeca6688 | 325 | red_restart(&q->vars); |
1da177e4 | 326 | q->backlog = 0; |
1da177e4 LT |
327 | } |
328 | } | |
329 | ||
6639607e TG |
330 | static inline void gred_destroy_vq(struct gred_sched_data *q) |
331 | { | |
332 | kfree(q); | |
333 | } | |
334 | ||
1e90474c | 335 | static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps) |
1da177e4 LT |
336 | { |
337 | struct gred_sched *table = qdisc_priv(sch); | |
1da177e4 | 338 | struct tc_gred_sopt *sopt; |
6639607e | 339 | int i; |
1da177e4 | 340 | |
27a3421e | 341 | if (dps == NULL) |
1da177e4 LT |
342 | return -EINVAL; |
343 | ||
1e90474c | 344 | sopt = nla_data(dps); |
1da177e4 | 345 | |
6639607e TG |
346 | if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs) |
347 | return -EINVAL; | |
1da177e4 | 348 | |
6639607e TG |
349 | sch_tree_lock(sch); |
350 | table->DPs = sopt->DPs; | |
351 | table->def = sopt->def_DP; | |
b38c7eef | 352 | table->red_flags = sopt->flags; |
dea3f628 | 353 | |
6639607e TG |
354 | /* |
355 | * Every entry point to GRED is synchronized with the above code | |
356 | * and the DP is checked against DPs, i.e. shadowed VQs can no | |
357 | * longer be found so we can unlock right here. | |
358 | */ | |
359 | sch_tree_unlock(sch); | |
dea3f628 | 360 | |
6639607e TG |
361 | if (sopt->grio) { |
362 | gred_enable_rio_mode(table); | |
363 | gred_disable_wred_mode(table); | |
364 | if (gred_wred_mode_check(sch)) | |
365 | gred_enable_wred_mode(table); | |
366 | } else { | |
367 | gred_disable_rio_mode(table); | |
368 | gred_disable_wred_mode(table); | |
369 | } | |
370 | ||
371 | for (i = table->DPs; i < MAX_DPs; i++) { | |
372 | if (table->tab[i]) { | |
c17988a9 YY |
373 | pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n", |
374 | i); | |
6639607e TG |
375 | gred_destroy_vq(table->tab[i]); |
376 | table->tab[i] = NULL; | |
10297b99 | 377 | } |
6639607e | 378 | } |
1da177e4 | 379 | |
6639607e TG |
380 | return 0; |
381 | } | |
382 | ||
f62d6b93 | 383 | static inline int gred_change_vq(struct Qdisc *sch, int dp, |
a73ed26b | 384 | struct tc_gred_qopt *ctl, int prio, |
869aa410 ED |
385 | u8 *stab, u32 max_P, |
386 | struct gred_sched_data **prealloc) | |
6639607e TG |
387 | { |
388 | struct gred_sched *table = qdisc_priv(sch); | |
869aa410 | 389 | struct gred_sched_data *q = table->tab[dp]; |
f62d6b93 | 390 | |
869aa410 ED |
391 | if (!q) { |
392 | table->tab[dp] = q = *prealloc; | |
393 | *prealloc = NULL; | |
394 | if (!q) | |
f62d6b93 | 395 | return -ENOMEM; |
f62d6b93 TG |
396 | } |
397 | ||
f62d6b93 TG |
398 | q->DP = dp; |
399 | q->prio = prio; | |
f62d6b93 | 400 | q->limit = ctl->limit; |
22b33429 TG |
401 | |
402 | if (q->backlog == 0) | |
eeca6688 | 403 | red_end_of_idle_period(&q->vars); |
22b33429 TG |
404 | |
405 | red_set_parms(&q->parms, | |
406 | ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, | |
a73ed26b | 407 | ctl->Scell_log, stab, max_P); |
eeca6688 | 408 | red_set_vars(&q->vars); |
f62d6b93 TG |
409 | return 0; |
410 | } | |
411 | ||
27a3421e PM |
412 | static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = { |
413 | [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) }, | |
414 | [TCA_GRED_STAB] = { .len = 256 }, | |
415 | [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) }, | |
a73ed26b | 416 | [TCA_GRED_MAX_P] = { .type = NLA_U32 }, |
27a3421e PM |
417 | }; |
418 | ||
1e90474c | 419 | static int gred_change(struct Qdisc *sch, struct nlattr *opt) |
f62d6b93 TG |
420 | { |
421 | struct gred_sched *table = qdisc_priv(sch); | |
6639607e | 422 | struct tc_gred_qopt *ctl; |
1e90474c | 423 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 424 | int err, prio = GRED_DEF_PRIO; |
f62d6b93 | 425 | u8 *stab; |
a73ed26b | 426 | u32 max_P; |
869aa410 | 427 | struct gred_sched_data *prealloc; |
6639607e | 428 | |
cee63723 | 429 | if (opt == NULL) |
6639607e TG |
430 | return -EINVAL; |
431 | ||
27a3421e | 432 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
cee63723 PM |
433 | if (err < 0) |
434 | return err; | |
435 | ||
1e90474c | 436 | if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) |
f62d6b93 | 437 | return gred_change_table_def(sch, opt); |
1da177e4 | 438 | |
1e90474c | 439 | if (tb[TCA_GRED_PARMS] == NULL || |
27a3421e | 440 | tb[TCA_GRED_STAB] == NULL) |
f62d6b93 | 441 | return -EINVAL; |
1da177e4 | 442 | |
a73ed26b ED |
443 | max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0; |
444 | ||
cee63723 | 445 | err = -EINVAL; |
1e90474c PM |
446 | ctl = nla_data(tb[TCA_GRED_PARMS]); |
447 | stab = nla_data(tb[TCA_GRED_STAB]); | |
a8aaa995 TG |
448 | |
449 | if (ctl->DP >= table->DPs) | |
f62d6b93 | 450 | goto errout; |
1da177e4 | 451 | |
d6fd4e96 | 452 | if (gred_rio_mode(table)) { |
f62d6b93 TG |
453 | if (ctl->prio == 0) { |
454 | int def_prio = GRED_DEF_PRIO; | |
455 | ||
456 | if (table->tab[table->def]) | |
457 | def_prio = table->tab[table->def]->prio; | |
458 | ||
459 | printk(KERN_DEBUG "GRED: DP %u does not have a prio " | |
460 | "setting default to %d\n", ctl->DP, def_prio); | |
461 | ||
462 | prio = def_prio; | |
463 | } else | |
464 | prio = ctl->prio; | |
1da177e4 LT |
465 | } |
466 | ||
869aa410 | 467 | prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL); |
f62d6b93 | 468 | sch_tree_lock(sch); |
1da177e4 | 469 | |
869aa410 | 470 | err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc); |
f62d6b93 TG |
471 | if (err < 0) |
472 | goto errout_locked; | |
1da177e4 | 473 | |
d6fd4e96 | 474 | if (gred_rio_mode(table)) { |
dea3f628 TG |
475 | gred_disable_wred_mode(table); |
476 | if (gred_wred_mode_check(sch)) | |
477 | gred_enable_wred_mode(table); | |
1da177e4 LT |
478 | } |
479 | ||
f62d6b93 | 480 | err = 0; |
1da177e4 | 481 | |
f62d6b93 TG |
482 | errout_locked: |
483 | sch_tree_unlock(sch); | |
869aa410 | 484 | kfree(prealloc); |
f62d6b93 TG |
485 | errout: |
486 | return err; | |
1da177e4 LT |
487 | } |
488 | ||
1e90474c | 489 | static int gred_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 490 | { |
1e90474c | 491 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 492 | int err; |
1da177e4 | 493 | |
cee63723 | 494 | if (opt == NULL) |
1da177e4 LT |
495 | return -EINVAL; |
496 | ||
27a3421e | 497 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
cee63723 PM |
498 | if (err < 0) |
499 | return err; | |
500 | ||
1e90474c | 501 | if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) |
6639607e | 502 | return -EINVAL; |
1da177e4 | 503 | |
1e90474c | 504 | return gred_change_table_def(sch, tb[TCA_GRED_DPS]); |
1da177e4 LT |
505 | } |
506 | ||
507 | static int gred_dump(struct Qdisc *sch, struct sk_buff *skb) | |
508 | { | |
1da177e4 | 509 | struct gred_sched *table = qdisc_priv(sch); |
1e90474c | 510 | struct nlattr *parms, *opts = NULL; |
1da177e4 | 511 | int i; |
a73ed26b | 512 | u32 max_p[MAX_DPs]; |
e0636822 TG |
513 | struct tc_gred_sopt sopt = { |
514 | .DPs = table->DPs, | |
515 | .def_DP = table->def, | |
516 | .grio = gred_rio_mode(table), | |
b38c7eef | 517 | .flags = table->red_flags, |
e0636822 | 518 | }; |
1da177e4 | 519 | |
1e90474c PM |
520 | opts = nla_nest_start(skb, TCA_OPTIONS); |
521 | if (opts == NULL) | |
522 | goto nla_put_failure; | |
1b34ec43 DM |
523 | if (nla_put(skb, TCA_GRED_DPS, sizeof(sopt), &sopt)) |
524 | goto nla_put_failure; | |
a73ed26b ED |
525 | |
526 | for (i = 0; i < MAX_DPs; i++) { | |
527 | struct gred_sched_data *q = table->tab[i]; | |
528 | ||
529 | max_p[i] = q ? q->parms.max_P : 0; | |
530 | } | |
1b34ec43 DM |
531 | if (nla_put(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p)) |
532 | goto nla_put_failure; | |
a73ed26b | 533 | |
1e90474c PM |
534 | parms = nla_nest_start(skb, TCA_GRED_PARMS); |
535 | if (parms == NULL) | |
536 | goto nla_put_failure; | |
1da177e4 | 537 | |
05f1cc01 TG |
538 | for (i = 0; i < MAX_DPs; i++) { |
539 | struct gred_sched_data *q = table->tab[i]; | |
540 | struct tc_gred_qopt opt; | |
1fe37b10 | 541 | unsigned long qavg; |
1da177e4 | 542 | |
05f1cc01 | 543 | memset(&opt, 0, sizeof(opt)); |
1da177e4 LT |
544 | |
545 | if (!q) { | |
546 | /* hack -- fix at some point with proper message | |
547 | This is how we indicate to tc that there is no VQ | |
548 | at this DP */ | |
549 | ||
05f1cc01 TG |
550 | opt.DP = MAX_DPs + i; |
551 | goto append_opt; | |
1da177e4 LT |
552 | } |
553 | ||
05f1cc01 TG |
554 | opt.limit = q->limit; |
555 | opt.DP = q->DP; | |
556 | opt.backlog = q->backlog; | |
557 | opt.prio = q->prio; | |
22b33429 TG |
558 | opt.qth_min = q->parms.qth_min >> q->parms.Wlog; |
559 | opt.qth_max = q->parms.qth_max >> q->parms.Wlog; | |
560 | opt.Wlog = q->parms.Wlog; | |
561 | opt.Plog = q->parms.Plog; | |
562 | opt.Scell_log = q->parms.Scell_log; | |
563 | opt.other = q->stats.other; | |
564 | opt.early = q->stats.prob_drop; | |
565 | opt.forced = q->stats.forced_drop; | |
566 | opt.pdrop = q->stats.pdrop; | |
05f1cc01 TG |
567 | opt.packets = q->packetsin; |
568 | opt.bytesin = q->bytesin; | |
569 | ||
244b65db DW |
570 | if (gred_wred_mode(table)) |
571 | gred_load_wred_set(table, q); | |
05f1cc01 | 572 | |
1fe37b10 DW |
573 | qavg = red_calc_qavg(&q->parms, &q->vars, |
574 | q->vars.qavg >> q->parms.Wlog); | |
575 | opt.qave = qavg >> q->parms.Wlog; | |
22b33429 | 576 | |
05f1cc01 | 577 | append_opt: |
1e90474c PM |
578 | if (nla_append(skb, sizeof(opt), &opt) < 0) |
579 | goto nla_put_failure; | |
1da177e4 LT |
580 | } |
581 | ||
1e90474c | 582 | nla_nest_end(skb, parms); |
1da177e4 | 583 | |
1e90474c | 584 | return nla_nest_end(skb, opts); |
1da177e4 | 585 | |
1e90474c | 586 | nla_put_failure: |
bc3ed28c TG |
587 | nla_nest_cancel(skb, opts); |
588 | return -EMSGSIZE; | |
1da177e4 LT |
589 | } |
590 | ||
591 | static void gred_destroy(struct Qdisc *sch) | |
592 | { | |
593 | struct gred_sched *table = qdisc_priv(sch); | |
594 | int i; | |
595 | ||
1e4dfaf9 | 596 | for (i = 0; i < table->DPs; i++) { |
1da177e4 | 597 | if (table->tab[i]) |
6639607e | 598 | gred_destroy_vq(table->tab[i]); |
1da177e4 LT |
599 | } |
600 | } | |
601 | ||
20fea08b | 602 | static struct Qdisc_ops gred_qdisc_ops __read_mostly = { |
1da177e4 LT |
603 | .id = "gred", |
604 | .priv_size = sizeof(struct gred_sched), | |
605 | .enqueue = gred_enqueue, | |
606 | .dequeue = gred_dequeue, | |
8e3af978 | 607 | .peek = qdisc_peek_head, |
1da177e4 LT |
608 | .drop = gred_drop, |
609 | .init = gred_init, | |
610 | .reset = gred_reset, | |
611 | .destroy = gred_destroy, | |
612 | .change = gred_change, | |
613 | .dump = gred_dump, | |
614 | .owner = THIS_MODULE, | |
615 | }; | |
616 | ||
617 | static int __init gred_module_init(void) | |
618 | { | |
619 | return register_qdisc(&gred_qdisc_ops); | |
620 | } | |
1e4dfaf9 TG |
621 | |
622 | static void __exit gred_module_exit(void) | |
1da177e4 LT |
623 | { |
624 | unregister_qdisc(&gred_qdisc_ops); | |
625 | } | |
1e4dfaf9 | 626 | |
1da177e4 LT |
627 | module_init(gred_module_init) |
628 | module_exit(gred_module_exit) | |
1e4dfaf9 | 629 | |
1da177e4 | 630 | MODULE_LICENSE("GPL"); |