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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Thomas Graf1e4dfaf92005-11-05 21:14:25 +010018 * For all the glorious comments look at include/net/red.h
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 */
20
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/types.h>
24#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <net/pkt_sched.h>
Thomas Graf22b33422005-11-05 21:14:16 +010027#include <net/red.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Thomas Graff62d6b92005-11-05 21:14:15 +010029#define GRED_DEF_PRIO (MAX_DPs / 2)
Thomas Graf716a1b42005-11-05 21:14:20 +010030#define GRED_VQ_MASK (MAX_DPs - 1)
Thomas Graff62d6b92005-11-05 21:14:15 +010031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032struct gred_sched_data;
33struct gred_sched;
34
Eric Dumazetcc7ec452011-01-19 19:26:56 +000035struct gred_sched_data {
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 u32 limit; /* HARD maximal queue length */
Eric Dumazeta73ed262011-12-09 02:46:45 +000037 u32 DP; /* the drop parameters */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 u32 bytesin; /* bytes seen on virtualQ so far*/
39 u32 packetsin; /* packets seen on virtualQ so far*/
40 u32 backlog; /* bytes on the virtualQ */
Thomas Graf1e4dfaf92005-11-05 21:14:25 +010041 u8 prio; /* the prio of this vq */
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Thomas Graf22b33422005-11-05 21:14:16 +010043 struct red_parms parms;
Eric Dumazeteeca6682012-01-05 02:25:16 +000044 struct red_vars vars;
Thomas Graf22b33422005-11-05 21:14:16 +010045 struct red_stats stats;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046};
47
Thomas Grafdea3f622005-11-05 21:14:09 +010048enum {
49 GRED_WRED_MODE = 1,
Thomas Grafd6fd4e92005-11-05 21:14:10 +010050 GRED_RIO_MODE,
Thomas Grafdea3f622005-11-05 21:14:09 +010051};
52
Eric Dumazetcc7ec452011-01-19 19:26:56 +000053struct gred_sched {
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct gred_sched_data *tab[MAX_DPs];
Thomas Grafdea3f622005-11-05 21:14:09 +010055 unsigned long flags;
Thomas Grafb38c7ee2005-11-05 21:14:27 +010056 u32 red_flags;
Thomas Graf1e4dfaf92005-11-05 21:14:25 +010057 u32 DPs;
58 u32 def;
Eric Dumazeteeca6682012-01-05 02:25:16 +000059 struct red_vars wred_set;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060};
61
Thomas Grafdea3f622005-11-05 21:14:09 +010062static inline int gred_wred_mode(struct gred_sched *table)
63{
64 return test_bit(GRED_WRED_MODE, &table->flags);
65}
66
67static inline void gred_enable_wred_mode(struct gred_sched *table)
68{
69 __set_bit(GRED_WRED_MODE, &table->flags);
70}
71
72static inline void gred_disable_wred_mode(struct gred_sched *table)
73{
74 __clear_bit(GRED_WRED_MODE, &table->flags);
75}
76
Thomas Grafd6fd4e92005-11-05 21:14:10 +010077static inline int gred_rio_mode(struct gred_sched *table)
78{
79 return test_bit(GRED_RIO_MODE, &table->flags);
80}
81
82static inline void gred_enable_rio_mode(struct gred_sched *table)
83{
84 __set_bit(GRED_RIO_MODE, &table->flags);
85}
86
87static inline void gred_disable_rio_mode(struct gred_sched *table)
88{
89 __clear_bit(GRED_RIO_MODE, &table->flags);
90}
91
Thomas Grafdea3f622005-11-05 21:14:09 +010092static 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
David Wardc22e4642012-09-13 05:22:33 +0000105 for (n = i + 1; n < table->DPs; n++)
106 if (table->tab[n] && table->tab[n]->prio == q->prio)
Thomas Grafdea3f622005-11-05 21:14:09 +0100107 return 1;
108 }
109
110 return 0;
111}
112
Thomas Graf22b33422005-11-05 21:14:16 +0100113static 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
Thomas Graf716a1b42005-11-05 21:14:20 +0100123static inline u16 tc_index_to_dp(struct sk_buff *skb)
124{
125 return skb->tc_index & GRED_VQ_MASK;
126}
127
Eric Dumazeteeca6682012-01-05 02:25:16 +0000128static inline void gred_load_wred_set(const struct gred_sched *table,
Thomas Graf70517032005-11-05 21:14:23 +0100129 struct gred_sched_data *q)
130{
Eric Dumazeteeca6682012-01-05 02:25:16 +0000131 q->vars.qavg = table->wred_set.qavg;
132 q->vars.qidlestart = table->wred_set.qidlestart;
Thomas Graf70517032005-11-05 21:14:23 +0100133}
134
135static inline void gred_store_wred_set(struct gred_sched *table,
136 struct gred_sched_data *q)
137{
Eric Dumazeteeca6682012-01-05 02:25:16 +0000138 table->wred_set.qavg = q->vars.qavg;
David Wardba1bf472012-09-13 05:22:35 +0000139 table->wred_set.qidlestart = q->vars.qidlestart;
Thomas Graf70517032005-11-05 21:14:23 +0100140}
141
Thomas Grafb38c7ee2005-11-05 21:14:27 +0100142static inline int gred_use_ecn(struct gred_sched *t)
143{
144 return t->red_flags & TC_RED_ECN;
145}
146
Thomas Grafbdc450a2005-11-05 21:14:28 +0100147static inline int gred_use_harddrop(struct gred_sched *t)
148{
149 return t->red_flags & TC_RED_HARDDROP;
150}
151
Eric Dumazet520ac302016-06-21 23:16:49 -0700152static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch,
153 struct sk_buff **to_free)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000155 struct gred_sched_data *q = NULL;
156 struct gred_sched *t = qdisc_priv(sch);
Thomas Graf22b33422005-11-05 21:14:16 +0100157 unsigned long qavg = 0;
Thomas Graf4a591832005-11-05 21:14:22 +0100158 u16 dp = tc_index_to_dp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000160 if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
Thomas Graf18e3fb842005-11-05 21:14:21 +0100161 dp = t->def;
162
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000163 q = t->tab[dp];
164 if (!q) {
Thomas Graf18e3fb842005-11-05 21:14:21 +0100165 /* Pass through packets not assigned to a DP
166 * if no default DP has been configured. This
167 * allows for DP flows to be left untouched.
168 */
David Warda3eb95f2015-05-09 22:01:46 -0400169 if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <=
170 sch->limit))
Thomas Graf18e3fb842005-11-05 21:14:21 +0100171 return qdisc_enqueue_tail(skb, sch);
172 else
173 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
Thomas Graf18e3fb842005-11-05 21:14:21 +0100175
Eric Dumazeteeca6682012-01-05 02:25:16 +0000176 /* fix tc_index? --could be controversial but needed for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 requeueing */
Thomas Graf18e3fb842005-11-05 21:14:21 +0100178 skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180
David Warde29fe832012-09-13 05:22:32 +0000181 /* sum up all the qaves of prios < ours to get the new qave */
Thomas Grafd6fd4e92005-11-05 21:14:10 +0100182 if (!gred_wred_mode(t) && gred_rio_mode(t)) {
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100183 int i;
184
185 for (i = 0; i < t->DPs; i++) {
186 if (t->tab[i] && t->tab[i]->prio < q->prio &&
Eric Dumazeteeca6682012-01-05 02:25:16 +0000187 !red_is_idling(&t->tab[i]->vars))
188 qavg += t->tab[i]->vars.qavg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 }
192
193 q->packetsin++;
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700194 q->bytesin += qdisc_pkt_len(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100196 if (gred_wred_mode(t))
Thomas Graf70517032005-11-05 21:14:23 +0100197 gred_load_wred_set(t, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Eric Dumazeteeca6682012-01-05 02:25:16 +0000199 q->vars.qavg = red_calc_qavg(&q->parms,
200 &q->vars,
201 gred_backlog(t, q, sch));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Eric Dumazeteeca6682012-01-05 02:25:16 +0000203 if (red_is_idling(&q->vars))
204 red_end_of_idle_period(&q->vars);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Thomas Grafdea3f622005-11-05 21:14:09 +0100206 if (gred_wred_mode(t))
Thomas Graf70517032005-11-05 21:14:23 +0100207 gred_store_wred_set(t, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Eric Dumazeteeca6682012-01-05 02:25:16 +0000209 switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000210 case RED_DONT_MARK:
211 break;
Thomas Graf22b33422005-11-05 21:14:16 +0100212
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000213 case RED_PROB_MARK:
John Fastabend25331d62014-09-28 11:53:29 -0700214 qdisc_qstats_overlimit(sch);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000215 if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) {
216 q->stats.prob_drop++;
217 goto congestion_drop;
218 }
Thomas Grafb38c7ee2005-11-05 21:14:27 +0100219
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000220 q->stats.prob_mark++;
221 break;
Thomas Graf22b33422005-11-05 21:14:16 +0100222
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000223 case RED_HARD_MARK:
John Fastabend25331d62014-09-28 11:53:29 -0700224 qdisc_qstats_overlimit(sch);
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000225 if (gred_use_harddrop(t) || !gred_use_ecn(t) ||
226 !INET_ECN_set_ce(skb)) {
227 q->stats.forced_drop++;
228 goto congestion_drop;
229 }
230 q->stats.forced_mark++;
231 break;
Thomas Graf22b33422005-11-05 21:14:16 +0100232 }
233
David Ward145a42b2015-05-09 22:01:47 -0400234 if (gred_backlog(t, q, sch) + qdisc_pkt_len(skb) <= q->limit) {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700235 q->backlog += qdisc_pkt_len(skb);
Thomas Grafedf7a7b2005-11-05 21:14:19 +0100236 return qdisc_enqueue_tail(skb, sch);
Thomas Graf22b33422005-11-05 21:14:16 +0100237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Thomas Graf22b33422005-11-05 21:14:16 +0100239 q->stats.pdrop++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240drop:
Eric Dumazet520ac302016-06-21 23:16:49 -0700241 return qdisc_drop(skb, sch, to_free);
Thomas Grafc3b553c2005-11-05 21:14:18 +0100242
243congestion_drop:
Eric Dumazet520ac302016-06-21 23:16:49 -0700244 qdisc_drop(skb, sch, to_free);
Thomas Grafc3b553c2005-11-05 21:14:18 +0100245 return NET_XMIT_CN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000248static struct sk_buff *gred_dequeue(struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 struct sk_buff *skb;
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100251 struct gred_sched *t = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Thomas Grafedf7a7b2005-11-05 21:14:19 +0100253 skb = qdisc_dequeue_head(sch);
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (skb) {
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100256 struct gred_sched_data *q;
Thomas Graf18e3fb842005-11-05 21:14:21 +0100257 u16 dp = tc_index_to_dp(skb);
258
259 if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
Joe Perchese87cc472012-05-13 21:56:26 +0000260 net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x after dequeue, screwing up backlog\n",
261 tc_index_to_dp(skb));
Thomas Graf18e3fb842005-11-05 21:14:21 +0100262 } else {
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700263 q->backlog -= qdisc_pkt_len(skb);
Thomas Graf18e3fb842005-11-05 21:14:21 +0100264
David Wardba1bf472012-09-13 05:22:35 +0000265 if (gred_wred_mode(t)) {
266 if (!sch->qstats.backlog)
267 red_start_of_idle_period(&t->wred_set);
268 } else {
269 if (!q->backlog)
270 red_start_of_idle_period(&q->vars);
271 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
Thomas Graf18e3fb842005-11-05 21:14:21 +0100273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return skb;
275 }
276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return NULL;
278}
279
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000280static void gred_reset(struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
282 int i;
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100283 struct gred_sched *t = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Thomas Grafedf7a7b2005-11-05 21:14:19 +0100285 qdisc_reset_queue(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900287 for (i = 0; i < t->DPs; i++) {
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100288 struct gred_sched_data *q = t->tab[i];
289
290 if (!q)
291 continue;
292
Eric Dumazeteeca6682012-01-05 02:25:16 +0000293 red_restart(&q->vars);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 q->backlog = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 }
296}
297
Thomas Graf66396072005-11-05 21:14:13 +0100298static inline void gred_destroy_vq(struct gred_sched_data *q)
299{
300 kfree(q);
301}
302
Patrick McHardy1e904742008-01-22 22:11:17 -0800303static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps)
Thomas Graf66396072005-11-05 21:14:13 +0100304{
305 struct gred_sched *table = qdisc_priv(sch);
306 struct tc_gred_sopt *sopt;
307 int i;
308
Alexander Aringac8ef4a2017-12-20 12:35:11 -0500309 if (!dps)
Thomas Graf66396072005-11-05 21:14:13 +0100310 return -EINVAL;
311
Patrick McHardy1e904742008-01-22 22:11:17 -0800312 sopt = nla_data(dps);
Thomas Graf66396072005-11-05 21:14:13 +0100313
Alexander Aringac8ef4a2017-12-20 12:35:11 -0500314 if (sopt->DPs > MAX_DPs || sopt->DPs == 0 ||
315 sopt->def_DP >= sopt->DPs)
Thomas Graf66396072005-11-05 21:14:13 +0100316 return -EINVAL;
317
318 sch_tree_lock(sch);
319 table->DPs = sopt->DPs;
320 table->def = sopt->def_DP;
Thomas Grafb38c7ee2005-11-05 21:14:27 +0100321 table->red_flags = sopt->flags;
Thomas Graf66396072005-11-05 21:14:13 +0100322
323 /*
324 * Every entry point to GRED is synchronized with the above code
325 * and the DP is checked against DPs, i.e. shadowed VQs can no
326 * longer be found so we can unlock right here.
327 */
328 sch_tree_unlock(sch);
329
330 if (sopt->grio) {
331 gred_enable_rio_mode(table);
332 gred_disable_wred_mode(table);
333 if (gred_wred_mode_check(sch))
334 gred_enable_wred_mode(table);
335 } else {
336 gred_disable_rio_mode(table);
337 gred_disable_wred_mode(table);
338 }
339
340 for (i = table->DPs; i < MAX_DPs; i++) {
341 if (table->tab[i]) {
Yang Yingliangc17988a2013-12-23 17:38:58 +0800342 pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n",
343 i);
Thomas Graf66396072005-11-05 21:14:13 +0100344 gred_destroy_vq(table->tab[i]);
345 table->tab[i] = NULL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900346 }
Thomas Graf66396072005-11-05 21:14:13 +0100347 }
348
Thomas Graf66396072005-11-05 21:14:13 +0100349 return 0;
350}
351
Thomas Graff62d6b92005-11-05 21:14:15 +0100352static inline int gred_change_vq(struct Qdisc *sch, int dp,
Eric Dumazeta73ed262011-12-09 02:46:45 +0000353 struct tc_gred_qopt *ctl, int prio,
Eric Dumazet869aa412011-12-15 22:09:45 +0000354 u8 *stab, u32 max_P,
355 struct gred_sched_data **prealloc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
357 struct gred_sched *table = qdisc_priv(sch);
Eric Dumazet869aa412011-12-15 22:09:45 +0000358 struct gred_sched_data *q = table->tab[dp];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Nogah Frankel8afa10c2017-12-04 13:31:11 +0200360 if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog))
361 return -EINVAL;
362
Eric Dumazet869aa412011-12-15 22:09:45 +0000363 if (!q) {
364 table->tab[dp] = q = *prealloc;
365 *prealloc = NULL;
366 if (!q)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 }
369
Thomas Graff62d6b92005-11-05 21:14:15 +0100370 q->DP = dp;
371 q->prio = prio;
David Warda3eb95f2015-05-09 22:01:46 -0400372 if (ctl->limit > sch->limit)
373 q->limit = sch->limit;
374 else
375 q->limit = ctl->limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Thomas Graf22b33422005-11-05 21:14:16 +0100377 if (q->backlog == 0)
Eric Dumazeteeca6682012-01-05 02:25:16 +0000378 red_end_of_idle_period(&q->vars);
Thomas Graf22b33422005-11-05 21:14:16 +0100379
380 red_set_parms(&q->parms,
381 ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
Eric Dumazeta73ed262011-12-09 02:46:45 +0000382 ctl->Scell_log, stab, max_P);
Eric Dumazeteeca6682012-01-05 02:25:16 +0000383 red_set_vars(&q->vars);
Thomas Graff62d6b92005-11-05 21:14:15 +0100384 return 0;
385}
386
Patrick McHardy27a34212008-01-23 20:35:39 -0800387static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = {
388 [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) },
389 [TCA_GRED_STAB] = { .len = 256 },
390 [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) },
Eric Dumazeta73ed262011-12-09 02:46:45 +0000391 [TCA_GRED_MAX_P] = { .type = NLA_U32 },
David Warda3eb95f2015-05-09 22:01:46 -0400392 [TCA_GRED_LIMIT] = { .type = NLA_U32 },
Patrick McHardy27a34212008-01-23 20:35:39 -0800393};
394
Alexander Aring20307212017-12-20 12:35:14 -0500395static int gred_change(struct Qdisc *sch, struct nlattr *opt,
396 struct netlink_ext_ack *extack)
Thomas Graff62d6b92005-11-05 21:14:15 +0100397{
398 struct gred_sched *table = qdisc_priv(sch);
399 struct tc_gred_qopt *ctl;
Patrick McHardy1e904742008-01-22 22:11:17 -0800400 struct nlattr *tb[TCA_GRED_MAX + 1];
Patrick McHardycee63722008-01-23 20:33:32 -0800401 int err, prio = GRED_DEF_PRIO;
Thomas Graff62d6b92005-11-05 21:14:15 +0100402 u8 *stab;
Eric Dumazeta73ed262011-12-09 02:46:45 +0000403 u32 max_P;
Eric Dumazet869aa412011-12-15 22:09:45 +0000404 struct gred_sched_data *prealloc;
Thomas Graff62d6b92005-11-05 21:14:15 +0100405
Patrick McHardycee63722008-01-23 20:33:32 -0800406 if (opt == NULL)
Thomas Graff62d6b92005-11-05 21:14:15 +0100407 return -EINVAL;
408
Johannes Bergfceb6432017-04-12 14:34:07 +0200409 err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, NULL);
Patrick McHardycee63722008-01-23 20:33:32 -0800410 if (err < 0)
411 return err;
412
David Warda3eb95f2015-05-09 22:01:46 -0400413 if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) {
414 if (tb[TCA_GRED_LIMIT] != NULL)
415 sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
Thomas Graff62d6b92005-11-05 21:14:15 +0100416 return gred_change_table_def(sch, opt);
David Warda3eb95f2015-05-09 22:01:46 -0400417 }
Thomas Graff62d6b92005-11-05 21:14:15 +0100418
Patrick McHardy1e904742008-01-22 22:11:17 -0800419 if (tb[TCA_GRED_PARMS] == NULL ||
David Warda3eb95f2015-05-09 22:01:46 -0400420 tb[TCA_GRED_STAB] == NULL ||
421 tb[TCA_GRED_LIMIT] != NULL)
Thomas Graff62d6b92005-11-05 21:14:15 +0100422 return -EINVAL;
423
Eric Dumazeta73ed262011-12-09 02:46:45 +0000424 max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0;
425
Patrick McHardycee63722008-01-23 20:33:32 -0800426 err = -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800427 ctl = nla_data(tb[TCA_GRED_PARMS]);
428 stab = nla_data(tb[TCA_GRED_STAB]);
Thomas Graff62d6b92005-11-05 21:14:15 +0100429
430 if (ctl->DP >= table->DPs)
431 goto errout;
432
433 if (gred_rio_mode(table)) {
434 if (ctl->prio == 0) {
435 int def_prio = GRED_DEF_PRIO;
436
437 if (table->tab[table->def])
438 def_prio = table->tab[table->def]->prio;
439
440 printk(KERN_DEBUG "GRED: DP %u does not have a prio "
441 "setting default to %d\n", ctl->DP, def_prio);
442
443 prio = def_prio;
444 } else
445 prio = ctl->prio;
446 }
447
Eric Dumazet869aa412011-12-15 22:09:45 +0000448 prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
Thomas Graff62d6b92005-11-05 21:14:15 +0100449 sch_tree_lock(sch);
450
Eric Dumazet869aa412011-12-15 22:09:45 +0000451 err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc);
Thomas Graff62d6b92005-11-05 21:14:15 +0100452 if (err < 0)
453 goto errout_locked;
454
Thomas Grafd6fd4e92005-11-05 21:14:10 +0100455 if (gred_rio_mode(table)) {
Thomas Grafdea3f622005-11-05 21:14:09 +0100456 gred_disable_wred_mode(table);
457 if (gred_wred_mode_check(sch))
458 gred_enable_wred_mode(table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 }
460
Thomas Graff62d6b92005-11-05 21:14:15 +0100461 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
Thomas Graff62d6b92005-11-05 21:14:15 +0100463errout_locked:
464 sch_tree_unlock(sch);
Eric Dumazet869aa412011-12-15 22:09:45 +0000465 kfree(prealloc);
Thomas Graff62d6b92005-11-05 21:14:15 +0100466errout:
467 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
Alexander Aringe63d7df2017-12-20 12:35:13 -0500470static int gred_init(struct Qdisc *sch, struct nlattr *opt,
471 struct netlink_ext_ack *extack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472{
Patrick McHardy1e904742008-01-22 22:11:17 -0800473 struct nlattr *tb[TCA_GRED_MAX + 1];
Patrick McHardycee63722008-01-23 20:33:32 -0800474 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
Alexander Aringac8ef4a2017-12-20 12:35:11 -0500476 if (!opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 return -EINVAL;
478
Johannes Bergfceb6432017-04-12 14:34:07 +0200479 err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, NULL);
Patrick McHardycee63722008-01-23 20:33:32 -0800480 if (err < 0)
481 return err;
482
Patrick McHardy1e904742008-01-22 22:11:17 -0800483 if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB])
Thomas Graf66396072005-11-05 21:14:13 +0100484 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
David Warda3eb95f2015-05-09 22:01:46 -0400486 if (tb[TCA_GRED_LIMIT])
487 sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
Phil Sutter348e3432015-08-18 10:30:49 +0200488 else
489 sch->limit = qdisc_dev(sch)->tx_queue_len
490 * psched_mtu(qdisc_dev(sch));
David Warda3eb95f2015-05-09 22:01:46 -0400491
Patrick McHardy1e904742008-01-22 22:11:17 -0800492 return gred_change_table_def(sch, tb[TCA_GRED_DPS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493}
494
495static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
496{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 struct gred_sched *table = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800498 struct nlattr *parms, *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 int i;
Eric Dumazeta73ed262011-12-09 02:46:45 +0000500 u32 max_p[MAX_DPs];
Thomas Grafe0636822005-11-05 21:14:12 +0100501 struct tc_gred_sopt sopt = {
502 .DPs = table->DPs,
503 .def_DP = table->def,
504 .grio = gred_rio_mode(table),
Thomas Grafb38c7ee2005-11-05 21:14:27 +0100505 .flags = table->red_flags,
Thomas Grafe0636822005-11-05 21:14:12 +0100506 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
Patrick McHardy1e904742008-01-22 22:11:17 -0800508 opts = nla_nest_start(skb, TCA_OPTIONS);
509 if (opts == NULL)
510 goto nla_put_failure;
David S. Miller1b34ec42012-03-29 05:11:39 -0400511 if (nla_put(skb, TCA_GRED_DPS, sizeof(sopt), &sopt))
512 goto nla_put_failure;
Eric Dumazeta73ed262011-12-09 02:46:45 +0000513
514 for (i = 0; i < MAX_DPs; i++) {
515 struct gred_sched_data *q = table->tab[i];
516
517 max_p[i] = q ? q->parms.max_P : 0;
518 }
David S. Miller1b34ec42012-03-29 05:11:39 -0400519 if (nla_put(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p))
520 goto nla_put_failure;
Eric Dumazeta73ed262011-12-09 02:46:45 +0000521
David Warda3eb95f2015-05-09 22:01:46 -0400522 if (nla_put_u32(skb, TCA_GRED_LIMIT, sch->limit))
523 goto nla_put_failure;
524
Patrick McHardy1e904742008-01-22 22:11:17 -0800525 parms = nla_nest_start(skb, TCA_GRED_PARMS);
526 if (parms == NULL)
527 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Thomas Graf05f1cc02005-11-05 21:14:11 +0100529 for (i = 0; i < MAX_DPs; i++) {
530 struct gred_sched_data *q = table->tab[i];
531 struct tc_gred_qopt opt;
David Ward1fe37b12012-09-13 05:22:34 +0000532 unsigned long qavg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Thomas Graf05f1cc02005-11-05 21:14:11 +0100534 memset(&opt, 0, sizeof(opt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 if (!q) {
537 /* hack -- fix at some point with proper message
538 This is how we indicate to tc that there is no VQ
539 at this DP */
540
Thomas Graf05f1cc02005-11-05 21:14:11 +0100541 opt.DP = MAX_DPs + i;
542 goto append_opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 }
544
Thomas Graf05f1cc02005-11-05 21:14:11 +0100545 opt.limit = q->limit;
546 opt.DP = q->DP;
David Ward145a42b2015-05-09 22:01:47 -0400547 opt.backlog = gred_backlog(table, q, sch);
Thomas Graf05f1cc02005-11-05 21:14:11 +0100548 opt.prio = q->prio;
Thomas Graf22b33422005-11-05 21:14:16 +0100549 opt.qth_min = q->parms.qth_min >> q->parms.Wlog;
550 opt.qth_max = q->parms.qth_max >> q->parms.Wlog;
551 opt.Wlog = q->parms.Wlog;
552 opt.Plog = q->parms.Plog;
553 opt.Scell_log = q->parms.Scell_log;
554 opt.other = q->stats.other;
555 opt.early = q->stats.prob_drop;
556 opt.forced = q->stats.forced_drop;
557 opt.pdrop = q->stats.pdrop;
Thomas Graf05f1cc02005-11-05 21:14:11 +0100558 opt.packets = q->packetsin;
559 opt.bytesin = q->bytesin;
560
David Ward244b65d2012-04-15 12:31:45 +0000561 if (gred_wred_mode(table))
562 gred_load_wred_set(table, q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
David Ward1fe37b12012-09-13 05:22:34 +0000564 qavg = red_calc_qavg(&q->parms, &q->vars,
565 q->vars.qavg >> q->parms.Wlog);
566 opt.qave = qavg >> q->parms.Wlog;
Thomas Graf22b33422005-11-05 21:14:16 +0100567
Thomas Graf05f1cc02005-11-05 21:14:11 +0100568append_opt:
Patrick McHardy1e904742008-01-22 22:11:17 -0800569 if (nla_append(skb, sizeof(opt), &opt) < 0)
570 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
572
Patrick McHardy1e904742008-01-22 22:11:17 -0800573 nla_nest_end(skb, parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Patrick McHardy1e904742008-01-22 22:11:17 -0800575 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Patrick McHardy1e904742008-01-22 22:11:17 -0800577nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700578 nla_nest_cancel(skb, opts);
579 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
582static void gred_destroy(struct Qdisc *sch)
583{
584 struct gred_sched *table = qdisc_priv(sch);
585 int i;
586
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100587 for (i = 0; i < table->DPs; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (table->tab[i])
Thomas Graf66396072005-11-05 21:14:13 +0100589 gred_destroy_vq(table->tab[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
591}
592
Eric Dumazet20fea082007-11-14 01:44:41 -0800593static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 .id = "gred",
595 .priv_size = sizeof(struct gred_sched),
596 .enqueue = gred_enqueue,
597 .dequeue = gred_dequeue,
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700598 .peek = qdisc_peek_head,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 .init = gred_init,
600 .reset = gred_reset,
601 .destroy = gred_destroy,
602 .change = gred_change,
603 .dump = gred_dump,
604 .owner = THIS_MODULE,
605};
606
607static int __init gred_module_init(void)
608{
609 return register_qdisc(&gred_qdisc_ops);
610}
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100611
612static void __exit gred_module_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
614 unregister_qdisc(&gred_qdisc_ops);
615}
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617module_init(gred_module_init)
618module_exit(gred_module_exit)
Thomas Graf1e4dfaf92005-11-05 21:14:25 +0100619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620MODULE_LICENSE("GPL");