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 | ||
105 | for (n = 0; n < table->DPs; n++) | |
106 | if (table->tab[n] && table->tab[n] != q && | |
107 | table->tab[n]->prio == q->prio) | |
108 | return 1; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
22b33429 TG |
114 | static inline unsigned int gred_backlog(struct gred_sched *table, |
115 | struct gred_sched_data *q, | |
116 | struct Qdisc *sch) | |
117 | { | |
118 | if (gred_wred_mode(table)) | |
119 | return sch->qstats.backlog; | |
120 | else | |
121 | return q->backlog; | |
122 | } | |
123 | ||
716a1b40 TG |
124 | static inline u16 tc_index_to_dp(struct sk_buff *skb) |
125 | { | |
126 | return skb->tc_index & GRED_VQ_MASK; | |
127 | } | |
128 | ||
eeca6688 | 129 | static inline void gred_load_wred_set(const struct gred_sched *table, |
7051703b TG |
130 | struct gred_sched_data *q) |
131 | { | |
eeca6688 ED |
132 | q->vars.qavg = table->wred_set.qavg; |
133 | q->vars.qidlestart = table->wred_set.qidlestart; | |
7051703b TG |
134 | } |
135 | ||
136 | static inline void gred_store_wred_set(struct gred_sched *table, | |
137 | struct gred_sched_data *q) | |
138 | { | |
eeca6688 | 139 | table->wred_set.qavg = q->vars.qavg; |
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 | ||
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 && | |
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: | |
212 | sch->qstats.overlimits++; | |
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: | |
222 | sch->qstats.overlimits++; | |
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) { | |
258 | if (net_ratelimit()) | |
cc7ec456 ED |
259 | pr_warning("GRED: Unable to relocate VQ 0x%x " |
260 | "after dequeue, screwing up " | |
261 | "backlog.\n", tc_index_to_dp(skb)); | |
18e3fb84 | 262 | } else { |
0abf77e5 | 263 | q->backlog -= qdisc_pkt_len(skb); |
18e3fb84 | 264 | |
dea3f628 | 265 | if (!q->backlog && !gred_wred_mode(t)) |
eeca6688 | 266 | red_start_of_idle_period(&q->vars); |
1da177e4 | 267 | } |
18e3fb84 | 268 | |
1da177e4 LT |
269 | return skb; |
270 | } | |
271 | ||
d8f64e19 | 272 | if (gred_wred_mode(t) && !red_is_idling(&t->wred_set)) |
7051703b | 273 | red_start_of_idle_period(&t->wred_set); |
1da177e4 LT |
274 | |
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) { | |
290 | if (net_ratelimit()) | |
cc7ec456 ED |
291 | pr_warning("GRED: Unable to relocate VQ 0x%x " |
292 | "while dropping, screwing up " | |
293 | "backlog.\n", tc_index_to_dp(skb)); | |
18e3fb84 | 294 | } else { |
1da177e4 | 295 | q->backlog -= len; |
22b33429 | 296 | q->stats.other++; |
18e3fb84 | 297 | |
dea3f628 | 298 | if (!q->backlog && !gred_wred_mode(t)) |
eeca6688 | 299 | red_start_of_idle_period(&q->vars); |
1da177e4 LT |
300 | } |
301 | ||
edf7a7b1 | 302 | qdisc_drop(skb, sch); |
1da177e4 LT |
303 | return len; |
304 | } | |
305 | ||
d8f64e19 | 306 | if (gred_wred_mode(t) && !red_is_idling(&t->wred_set)) |
7051703b | 307 | red_start_of_idle_period(&t->wred_set); |
1da177e4 | 308 | |
1da177e4 LT |
309 | return 0; |
310 | ||
311 | } | |
312 | ||
cc7ec456 | 313 | static void gred_reset(struct Qdisc *sch) |
1da177e4 LT |
314 | { |
315 | int i; | |
1e4dfaf9 | 316 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 317 | |
edf7a7b1 | 318 | qdisc_reset_queue(sch); |
1da177e4 | 319 | |
10297b99 | 320 | for (i = 0; i < t->DPs; i++) { |
1e4dfaf9 TG |
321 | struct gred_sched_data *q = t->tab[i]; |
322 | ||
323 | if (!q) | |
324 | continue; | |
325 | ||
eeca6688 | 326 | red_restart(&q->vars); |
1da177e4 | 327 | q->backlog = 0; |
1da177e4 LT |
328 | } |
329 | } | |
330 | ||
6639607e TG |
331 | static inline void gred_destroy_vq(struct gred_sched_data *q) |
332 | { | |
333 | kfree(q); | |
334 | } | |
335 | ||
1e90474c | 336 | static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps) |
1da177e4 LT |
337 | { |
338 | struct gred_sched *table = qdisc_priv(sch); | |
1da177e4 | 339 | struct tc_gred_sopt *sopt; |
6639607e | 340 | int i; |
1da177e4 | 341 | |
27a3421e | 342 | if (dps == NULL) |
1da177e4 LT |
343 | return -EINVAL; |
344 | ||
1e90474c | 345 | sopt = nla_data(dps); |
1da177e4 | 346 | |
6639607e TG |
347 | if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs) |
348 | return -EINVAL; | |
1da177e4 | 349 | |
6639607e TG |
350 | sch_tree_lock(sch); |
351 | table->DPs = sopt->DPs; | |
352 | table->def = sopt->def_DP; | |
b38c7eef | 353 | table->red_flags = sopt->flags; |
dea3f628 | 354 | |
6639607e TG |
355 | /* |
356 | * Every entry point to GRED is synchronized with the above code | |
357 | * and the DP is checked against DPs, i.e. shadowed VQs can no | |
358 | * longer be found so we can unlock right here. | |
359 | */ | |
360 | sch_tree_unlock(sch); | |
dea3f628 | 361 | |
6639607e TG |
362 | if (sopt->grio) { |
363 | gred_enable_rio_mode(table); | |
364 | gred_disable_wred_mode(table); | |
365 | if (gred_wred_mode_check(sch)) | |
366 | gred_enable_wred_mode(table); | |
367 | } else { | |
368 | gred_disable_rio_mode(table); | |
369 | gred_disable_wred_mode(table); | |
370 | } | |
371 | ||
372 | for (i = table->DPs; i < MAX_DPs; i++) { | |
373 | if (table->tab[i]) { | |
cc7ec456 ED |
374 | pr_warning("GRED: Warning: Destroying " |
375 | "shadowed VQ 0x%x\n", i); | |
6639607e TG |
376 | gred_destroy_vq(table->tab[i]); |
377 | table->tab[i] = NULL; | |
10297b99 | 378 | } |
6639607e | 379 | } |
1da177e4 | 380 | |
6639607e TG |
381 | return 0; |
382 | } | |
383 | ||
f62d6b93 | 384 | static inline int gred_change_vq(struct Qdisc *sch, int dp, |
a73ed26b | 385 | struct tc_gred_qopt *ctl, int prio, |
869aa410 ED |
386 | u8 *stab, u32 max_P, |
387 | struct gred_sched_data **prealloc) | |
6639607e TG |
388 | { |
389 | struct gred_sched *table = qdisc_priv(sch); | |
869aa410 | 390 | struct gred_sched_data *q = table->tab[dp]; |
f62d6b93 | 391 | |
869aa410 ED |
392 | if (!q) { |
393 | table->tab[dp] = q = *prealloc; | |
394 | *prealloc = NULL; | |
395 | if (!q) | |
f62d6b93 | 396 | return -ENOMEM; |
f62d6b93 TG |
397 | } |
398 | ||
f62d6b93 TG |
399 | q->DP = dp; |
400 | q->prio = prio; | |
f62d6b93 | 401 | q->limit = ctl->limit; |
22b33429 TG |
402 | |
403 | if (q->backlog == 0) | |
eeca6688 | 404 | red_end_of_idle_period(&q->vars); |
22b33429 TG |
405 | |
406 | red_set_parms(&q->parms, | |
407 | ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, | |
a73ed26b | 408 | ctl->Scell_log, stab, max_P); |
eeca6688 | 409 | red_set_vars(&q->vars); |
f62d6b93 TG |
410 | return 0; |
411 | } | |
412 | ||
27a3421e PM |
413 | static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = { |
414 | [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) }, | |
415 | [TCA_GRED_STAB] = { .len = 256 }, | |
416 | [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) }, | |
a73ed26b | 417 | [TCA_GRED_MAX_P] = { .type = NLA_U32 }, |
27a3421e PM |
418 | }; |
419 | ||
1e90474c | 420 | static int gred_change(struct Qdisc *sch, struct nlattr *opt) |
f62d6b93 TG |
421 | { |
422 | struct gred_sched *table = qdisc_priv(sch); | |
6639607e | 423 | struct tc_gred_qopt *ctl; |
1e90474c | 424 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 425 | int err, prio = GRED_DEF_PRIO; |
f62d6b93 | 426 | u8 *stab; |
a73ed26b | 427 | u32 max_P; |
869aa410 | 428 | struct gred_sched_data *prealloc; |
6639607e | 429 | |
cee63723 | 430 | if (opt == NULL) |
6639607e TG |
431 | return -EINVAL; |
432 | ||
27a3421e | 433 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
cee63723 PM |
434 | if (err < 0) |
435 | return err; | |
436 | ||
1e90474c | 437 | if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) |
f62d6b93 | 438 | return gred_change_table_def(sch, opt); |
1da177e4 | 439 | |
1e90474c | 440 | if (tb[TCA_GRED_PARMS] == NULL || |
27a3421e | 441 | tb[TCA_GRED_STAB] == NULL) |
f62d6b93 | 442 | return -EINVAL; |
1da177e4 | 443 | |
a73ed26b ED |
444 | max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0; |
445 | ||
cee63723 | 446 | err = -EINVAL; |
1e90474c PM |
447 | ctl = nla_data(tb[TCA_GRED_PARMS]); |
448 | stab = nla_data(tb[TCA_GRED_STAB]); | |
a8aaa995 TG |
449 | |
450 | if (ctl->DP >= table->DPs) | |
f62d6b93 | 451 | goto errout; |
1da177e4 | 452 | |
d6fd4e96 | 453 | if (gred_rio_mode(table)) { |
f62d6b93 TG |
454 | if (ctl->prio == 0) { |
455 | int def_prio = GRED_DEF_PRIO; | |
456 | ||
457 | if (table->tab[table->def]) | |
458 | def_prio = table->tab[table->def]->prio; | |
459 | ||
460 | printk(KERN_DEBUG "GRED: DP %u does not have a prio " | |
461 | "setting default to %d\n", ctl->DP, def_prio); | |
462 | ||
463 | prio = def_prio; | |
464 | } else | |
465 | prio = ctl->prio; | |
1da177e4 LT |
466 | } |
467 | ||
869aa410 | 468 | prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL); |
f62d6b93 | 469 | sch_tree_lock(sch); |
1da177e4 | 470 | |
869aa410 | 471 | err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc); |
f62d6b93 TG |
472 | if (err < 0) |
473 | goto errout_locked; | |
1da177e4 | 474 | |
d6fd4e96 | 475 | if (gred_rio_mode(table)) { |
dea3f628 TG |
476 | gred_disable_wred_mode(table); |
477 | if (gred_wred_mode_check(sch)) | |
478 | gred_enable_wred_mode(table); | |
1da177e4 LT |
479 | } |
480 | ||
f62d6b93 | 481 | err = 0; |
1da177e4 | 482 | |
f62d6b93 TG |
483 | errout_locked: |
484 | sch_tree_unlock(sch); | |
869aa410 | 485 | kfree(prealloc); |
f62d6b93 TG |
486 | errout: |
487 | return err; | |
1da177e4 LT |
488 | } |
489 | ||
1e90474c | 490 | static int gred_init(struct Qdisc *sch, struct nlattr *opt) |
1da177e4 | 491 | { |
1e90474c | 492 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 493 | int err; |
1da177e4 | 494 | |
cee63723 | 495 | if (opt == NULL) |
1da177e4 LT |
496 | return -EINVAL; |
497 | ||
27a3421e | 498 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
cee63723 PM |
499 | if (err < 0) |
500 | return err; | |
501 | ||
1e90474c | 502 | if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) |
6639607e | 503 | return -EINVAL; |
1da177e4 | 504 | |
1e90474c | 505 | return gred_change_table_def(sch, tb[TCA_GRED_DPS]); |
1da177e4 LT |
506 | } |
507 | ||
508 | static int gred_dump(struct Qdisc *sch, struct sk_buff *skb) | |
509 | { | |
1da177e4 | 510 | struct gred_sched *table = qdisc_priv(sch); |
1e90474c | 511 | struct nlattr *parms, *opts = NULL; |
1da177e4 | 512 | int i; |
a73ed26b | 513 | u32 max_p[MAX_DPs]; |
e0636822 TG |
514 | struct tc_gred_sopt sopt = { |
515 | .DPs = table->DPs, | |
516 | .def_DP = table->def, | |
517 | .grio = gred_rio_mode(table), | |
b38c7eef | 518 | .flags = table->red_flags, |
e0636822 | 519 | }; |
1da177e4 | 520 | |
1e90474c PM |
521 | opts = nla_nest_start(skb, TCA_OPTIONS); |
522 | if (opts == NULL) | |
523 | goto nla_put_failure; | |
524 | NLA_PUT(skb, TCA_GRED_DPS, sizeof(sopt), &sopt); | |
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 | } | |
531 | NLA_PUT(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p); | |
532 | ||
1e90474c PM |
533 | parms = nla_nest_start(skb, TCA_GRED_PARMS); |
534 | if (parms == NULL) | |
535 | goto nla_put_failure; | |
1da177e4 | 536 | |
05f1cc01 TG |
537 | for (i = 0; i < MAX_DPs; i++) { |
538 | struct gred_sched_data *q = table->tab[i]; | |
539 | struct tc_gred_qopt opt; | |
1da177e4 | 540 | |
05f1cc01 | 541 | memset(&opt, 0, sizeof(opt)); |
1da177e4 LT |
542 | |
543 | if (!q) { | |
544 | /* hack -- fix at some point with proper message | |
545 | This is how we indicate to tc that there is no VQ | |
546 | at this DP */ | |
547 | ||
05f1cc01 TG |
548 | opt.DP = MAX_DPs + i; |
549 | goto append_opt; | |
1da177e4 LT |
550 | } |
551 | ||
05f1cc01 TG |
552 | opt.limit = q->limit; |
553 | opt.DP = q->DP; | |
554 | opt.backlog = q->backlog; | |
555 | opt.prio = q->prio; | |
22b33429 TG |
556 | opt.qth_min = q->parms.qth_min >> q->parms.Wlog; |
557 | opt.qth_max = q->parms.qth_max >> q->parms.Wlog; | |
558 | opt.Wlog = q->parms.Wlog; | |
559 | opt.Plog = q->parms.Plog; | |
560 | opt.Scell_log = q->parms.Scell_log; | |
561 | opt.other = q->stats.other; | |
562 | opt.early = q->stats.prob_drop; | |
563 | opt.forced = q->stats.forced_drop; | |
564 | opt.pdrop = q->stats.pdrop; | |
05f1cc01 TG |
565 | opt.packets = q->packetsin; |
566 | opt.bytesin = q->bytesin; | |
567 | ||
22b33429 | 568 | if (gred_wred_mode(table)) { |
eeca6688 ED |
569 | q->vars.qidlestart = |
570 | table->tab[table->def]->vars.qidlestart; | |
571 | q->vars.qavg = table->tab[table->def]->vars.qavg; | |
1da177e4 | 572 | } |
05f1cc01 | 573 | |
eeca6688 | 574 | opt.qave = red_calc_qavg(&q->parms, &q->vars, q->vars.qavg); |
22b33429 | 575 | |
05f1cc01 | 576 | append_opt: |
1e90474c PM |
577 | if (nla_append(skb, sizeof(opt), &opt) < 0) |
578 | goto nla_put_failure; | |
1da177e4 LT |
579 | } |
580 | ||
1e90474c | 581 | nla_nest_end(skb, parms); |
1da177e4 | 582 | |
1e90474c | 583 | return nla_nest_end(skb, opts); |
1da177e4 | 584 | |
1e90474c | 585 | nla_put_failure: |
bc3ed28c TG |
586 | nla_nest_cancel(skb, opts); |
587 | return -EMSGSIZE; | |
1da177e4 LT |
588 | } |
589 | ||
590 | static void gred_destroy(struct Qdisc *sch) | |
591 | { | |
592 | struct gred_sched *table = qdisc_priv(sch); | |
593 | int i; | |
594 | ||
1e4dfaf9 | 595 | for (i = 0; i < table->DPs; i++) { |
1da177e4 | 596 | if (table->tab[i]) |
6639607e | 597 | gred_destroy_vq(table->tab[i]); |
1da177e4 LT |
598 | } |
599 | } | |
600 | ||
20fea08b | 601 | static struct Qdisc_ops gred_qdisc_ops __read_mostly = { |
1da177e4 LT |
602 | .id = "gred", |
603 | .priv_size = sizeof(struct gred_sched), | |
604 | .enqueue = gred_enqueue, | |
605 | .dequeue = gred_dequeue, | |
8e3af978 | 606 | .peek = qdisc_peek_head, |
1da177e4 LT |
607 | .drop = gred_drop, |
608 | .init = gred_init, | |
609 | .reset = gred_reset, | |
610 | .destroy = gred_destroy, | |
611 | .change = gred_change, | |
612 | .dump = gred_dump, | |
613 | .owner = THIS_MODULE, | |
614 | }; | |
615 | ||
616 | static int __init gred_module_init(void) | |
617 | { | |
618 | return register_qdisc(&gred_qdisc_ops); | |
619 | } | |
1e4dfaf9 TG |
620 | |
621 | static void __exit gred_module_exit(void) | |
1da177e4 LT |
622 | { |
623 | unregister_qdisc(&gred_qdisc_ops); | |
624 | } | |
1e4dfaf9 | 625 | |
1da177e4 LT |
626 | module_init(gred_module_init) |
627 | module_exit(gred_module_exit) | |
1e4dfaf9 | 628 | |
1da177e4 | 629 | MODULE_LICENSE("GPL"); |