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Linux/net/sched/sch_gred.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net/sched/sch_gred.c Generic Random Early Detection queue.
  4  *
  5  * Authors:    J Hadi Salim (hadi@cyberus.ca) 1998-2002
  6  *
  7  *             991129: -  Bug fix with grio mode
  8  *                     - a better sing. AvgQ mode with Grio(WRED)
  9  *                     - A finer grained VQ dequeue based on sugestion
 10  *                       from Ren Liu
 11  *                     - More error checks
 12  *
 13  *  For all the glorious comments look at include/net/red.h
 14  */
 15 
 16 #include <linux/slab.h>
 17 #include <linux/module.h>
 18 #include <linux/types.h>
 19 #include <linux/kernel.h>
 20 #include <linux/skbuff.h>
 21 #include <net/pkt_cls.h>
 22 #include <net/pkt_sched.h>
 23 #include <net/red.h>
 24 
 25 #define GRED_DEF_PRIO (MAX_DPs / 2)
 26 #define GRED_VQ_MASK (MAX_DPs - 1)
 27 
 28 #define GRED_VQ_RED_FLAGS       (TC_RED_ECN | TC_RED_HARDDROP)
 29 
 30 struct gred_sched_data;
 31 struct gred_sched;
 32 
 33 struct gred_sched_data {
 34         u32             limit;          /* HARD maximal queue length    */
 35         u32             DP;             /* the drop parameters */
 36         u32             red_flags;      /* virtualQ version of red_flags */
 37         u64             bytesin;        /* bytes seen on virtualQ so far*/
 38         u32             packetsin;      /* packets seen on virtualQ so far*/
 39         u32             backlog;        /* bytes on the virtualQ */
 40         u8              prio;           /* the prio of this vq */
 41 
 42         struct red_parms parms;
 43         struct red_vars  vars;
 44         struct red_stats stats;
 45 };
 46 
 47 enum {
 48         GRED_WRED_MODE = 1,
 49         GRED_RIO_MODE,
 50 };
 51 
 52 struct gred_sched {
 53         struct gred_sched_data *tab[MAX_DPs];
 54         unsigned long   flags;
 55         u32             red_flags;
 56         u32             DPs;
 57         u32             def;
 58         struct red_vars wred_set;
 59 };
 60 
 61 static inline int gred_wred_mode(struct gred_sched *table)
 62 {
 63         return test_bit(GRED_WRED_MODE, &table->flags);
 64 }
 65 
 66 static inline void gred_enable_wred_mode(struct gred_sched *table)
 67 {
 68         __set_bit(GRED_WRED_MODE, &table->flags);
 69 }
 70 
 71 static inline void gred_disable_wred_mode(struct gred_sched *table)
 72 {
 73         __clear_bit(GRED_WRED_MODE, &table->flags);
 74 }
 75 
 76 static inline int gred_rio_mode(struct gred_sched *table)
 77 {
 78         return test_bit(GRED_RIO_MODE, &table->flags);
 79 }
 80 
 81 static inline void gred_enable_rio_mode(struct gred_sched *table)
 82 {
 83         __set_bit(GRED_RIO_MODE, &table->flags);
 84 }
 85 
 86 static inline void gred_disable_rio_mode(struct gred_sched *table)
 87 {
 88         __clear_bit(GRED_RIO_MODE, &table->flags);
 89 }
 90 
 91 static inline int gred_wred_mode_check(struct Qdisc *sch)
 92 {
 93         struct gred_sched *table = qdisc_priv(sch);
 94         int i;
 95 
 96         /* Really ugly O(n^2) but shouldn't be necessary too frequent. */
 97         for (i = 0; i < table->DPs; i++) {
 98                 struct gred_sched_data *q = table->tab[i];
 99                 int n;
100 
101                 if (q == NULL)
102                         continue;
103 
104                 for (n = i + 1; n < table->DPs; n++)
105                         if (table->tab[n] && table->tab[n]->prio == q->prio)
106                                 return 1;
107         }
108 
109         return 0;
110 }
111 
112 static inline unsigned int gred_backlog(struct gred_sched *table,
113                                         struct gred_sched_data *q,
114                                         struct Qdisc *sch)
115 {
116         if (gred_wred_mode(table))
117                 return sch->qstats.backlog;
118         else
119                 return q->backlog;
120 }
121 
122 static inline u16 tc_index_to_dp(struct sk_buff *skb)
123 {
124         return skb->tc_index & GRED_VQ_MASK;
125 }
126 
127 static inline void gred_load_wred_set(const struct gred_sched *table,
128                                       struct gred_sched_data *q)
129 {
130         q->vars.qavg = table->wred_set.qavg;
131         q->vars.qidlestart = table->wred_set.qidlestart;
132 }
133 
134 static inline void gred_store_wred_set(struct gred_sched *table,
135                                        struct gred_sched_data *q)
136 {
137         table->wred_set.qavg = q->vars.qavg;
138         table->wred_set.qidlestart = q->vars.qidlestart;
139 }
140 
141 static int gred_use_ecn(struct gred_sched_data *q)
142 {
143         return q->red_flags & TC_RED_ECN;
144 }
145 
146 static int gred_use_harddrop(struct gred_sched_data *q)
147 {
148         return q->red_flags & TC_RED_HARDDROP;
149 }
150 
151 static bool gred_per_vq_red_flags_used(struct gred_sched *table)
152 {
153         unsigned int i;
154 
155         /* Local per-vq flags couldn't have been set unless global are 0 */
156         if (table->red_flags)
157                 return false;
158         for (i = 0; i < MAX_DPs; i++)
159                 if (table->tab[i] && table->tab[i]->red_flags)
160                         return true;
161         return false;
162 }
163 
164 static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch,
165                         struct sk_buff **to_free)
166 {
167         struct gred_sched_data *q = NULL;
168         struct gred_sched *t = qdisc_priv(sch);
169         unsigned long qavg = 0;
170         u16 dp = tc_index_to_dp(skb);
171 
172         if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
173                 dp = t->def;
174 
175                 q = t->tab[dp];
176                 if (!q) {
177                         /* Pass through packets not assigned to a DP
178                          * if no default DP has been configured. This
179                          * allows for DP flows to be left untouched.
180                          */
181                         if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <=
182                                         sch->limit))
183                                 return qdisc_enqueue_tail(skb, sch);
184                         else
185                                 goto drop;
186                 }
187 
188                 /* fix tc_index? --could be controversial but needed for
189                    requeueing */
190                 skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp;
191         }
192 
193         /* sum up all the qaves of prios < ours to get the new qave */
194         if (!gred_wred_mode(t) && gred_rio_mode(t)) {
195                 int i;
196 
197                 for (i = 0; i < t->DPs; i++) {
198                         if (t->tab[i] && t->tab[i]->prio < q->prio &&
199                             !red_is_idling(&t->tab[i]->vars))
200                                 qavg += t->tab[i]->vars.qavg;
201                 }
202 
203         }
204 
205         q->packetsin++;
206         q->bytesin += qdisc_pkt_len(skb);
207 
208         if (gred_wred_mode(t))
209                 gred_load_wred_set(t, q);
210 
211         q->vars.qavg = red_calc_qavg(&q->parms,
212                                      &q->vars,
213                                      gred_backlog(t, q, sch));
214 
215         if (red_is_idling(&q->vars))
216                 red_end_of_idle_period(&q->vars);
217 
218         if (gred_wred_mode(t))
219                 gred_store_wred_set(t, q);
220 
221         switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) {
222         case RED_DONT_MARK:
223                 break;
224 
225         case RED_PROB_MARK:
226                 qdisc_qstats_overlimit(sch);
227                 if (!gred_use_ecn(q) || !INET_ECN_set_ce(skb)) {
228                         q->stats.prob_drop++;
229                         goto congestion_drop;
230                 }
231 
232                 q->stats.prob_mark++;
233                 break;
234 
235         case RED_HARD_MARK:
236                 qdisc_qstats_overlimit(sch);
237                 if (gred_use_harddrop(q) || !gred_use_ecn(q) ||
238                     !INET_ECN_set_ce(skb)) {
239                         q->stats.forced_drop++;
240                         goto congestion_drop;
241                 }
242                 q->stats.forced_mark++;
243                 break;
244         }
245 
246         if (gred_backlog(t, q, sch) + qdisc_pkt_len(skb) <= q->limit) {
247                 q->backlog += qdisc_pkt_len(skb);
248                 return qdisc_enqueue_tail(skb, sch);
249         }
250 
251         q->stats.pdrop++;
252 drop:
253         return qdisc_drop(skb, sch, to_free);
254 
255 congestion_drop:
256         qdisc_drop(skb, sch, to_free);
257         return NET_XMIT_CN;
258 }
259 
260 static struct sk_buff *gred_dequeue(struct Qdisc *sch)
261 {
262         struct sk_buff *skb;
263         struct gred_sched *t = qdisc_priv(sch);
264 
265         skb = qdisc_dequeue_head(sch);
266 
267         if (skb) {
268                 struct gred_sched_data *q;
269                 u16 dp = tc_index_to_dp(skb);
270 
271                 if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
272                         net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x after dequeue, screwing up backlog\n",
273                                              tc_index_to_dp(skb));
274                 } else {
275                         q->backlog -= qdisc_pkt_len(skb);
276 
277                         if (gred_wred_mode(t)) {
278                                 if (!sch->qstats.backlog)
279                                         red_start_of_idle_period(&t->wred_set);
280                         } else {
281                                 if (!q->backlog)
282                                         red_start_of_idle_period(&q->vars);
283                         }
284                 }
285 
286                 return skb;
287         }
288 
289         return NULL;
290 }
291 
292 static void gred_reset(struct Qdisc *sch)
293 {
294         int i;
295         struct gred_sched *t = qdisc_priv(sch);
296 
297         qdisc_reset_queue(sch);
298 
299         for (i = 0; i < t->DPs; i++) {
300                 struct gred_sched_data *q = t->tab[i];
301 
302                 if (!q)
303                         continue;
304 
305                 red_restart(&q->vars);
306                 q->backlog = 0;
307         }
308 }
309 
310 static void gred_offload(struct Qdisc *sch, enum tc_gred_command command)
311 {
312         struct gred_sched *table = qdisc_priv(sch);
313         struct net_device *dev = qdisc_dev(sch);
314         struct tc_gred_qopt_offload opt = {
315                 .command        = command,
316                 .handle         = sch->handle,
317                 .parent         = sch->parent,
318         };
319 
320         if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
321                 return;
322 
323         if (command == TC_GRED_REPLACE) {
324                 unsigned int i;
325 
326                 opt.set.grio_on = gred_rio_mode(table);
327                 opt.set.wred_on = gred_wred_mode(table);
328                 opt.set.dp_cnt = table->DPs;
329                 opt.set.dp_def = table->def;
330 
331                 for (i = 0; i < table->DPs; i++) {
332                         struct gred_sched_data *q = table->tab[i];
333 
334                         if (!q)
335                                 continue;
336                         opt.set.tab[i].present = true;
337                         opt.set.tab[i].limit = q->limit;
338                         opt.set.tab[i].prio = q->prio;
339                         opt.set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
340                         opt.set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
341                         opt.set.tab[i].is_ecn = gred_use_ecn(q);
342                         opt.set.tab[i].is_harddrop = gred_use_harddrop(q);
343                         opt.set.tab[i].probability = q->parms.max_P;
344                         opt.set.tab[i].backlog = &q->backlog;
345                 }
346                 opt.set.qstats = &sch->qstats;
347         }
348 
349         dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, &opt);
350 }
351 
352 static int gred_offload_dump_stats(struct Qdisc *sch)
353 {
354         struct gred_sched *table = qdisc_priv(sch);
355         struct tc_gred_qopt_offload *hw_stats;
356         unsigned int i;
357         int ret;
358 
359         hw_stats = kzalloc(sizeof(*hw_stats), GFP_KERNEL);
360         if (!hw_stats)
361                 return -ENOMEM;
362 
363         hw_stats->command = TC_GRED_STATS;
364         hw_stats->handle = sch->handle;
365         hw_stats->parent = sch->parent;
366 
367         for (i = 0; i < MAX_DPs; i++)
368                 if (table->tab[i])
369                         hw_stats->stats.xstats[i] = &table->tab[i]->stats;
370 
371         ret = qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_GRED, hw_stats);
372         /* Even if driver returns failure adjust the stats - in case offload
373          * ended but driver still wants to adjust the values.
374          */
375         for (i = 0; i < MAX_DPs; i++) {
376                 if (!table->tab[i])
377                         continue;
378                 table->tab[i]->packetsin += hw_stats->stats.bstats[i].packets;
379                 table->tab[i]->bytesin += hw_stats->stats.bstats[i].bytes;
380                 table->tab[i]->backlog += hw_stats->stats.qstats[i].backlog;
381 
382                 _bstats_update(&sch->bstats,
383                                hw_stats->stats.bstats[i].bytes,
384                                hw_stats->stats.bstats[i].packets);
385                 sch->qstats.qlen += hw_stats->stats.qstats[i].qlen;
386                 sch->qstats.backlog += hw_stats->stats.qstats[i].backlog;
387                 sch->qstats.drops += hw_stats->stats.qstats[i].drops;
388                 sch->qstats.requeues += hw_stats->stats.qstats[i].requeues;
389                 sch->qstats.overlimits += hw_stats->stats.qstats[i].overlimits;
390         }
391 
392         kfree(hw_stats);
393         return ret;
394 }
395 
396 static inline void gred_destroy_vq(struct gred_sched_data *q)
397 {
398         kfree(q);
399 }
400 
401 static int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps,
402                                  struct netlink_ext_ack *extack)
403 {
404         struct gred_sched *table = qdisc_priv(sch);
405         struct tc_gred_sopt *sopt;
406         bool red_flags_changed;
407         int i;
408 
409         if (!dps)
410                 return -EINVAL;
411 
412         sopt = nla_data(dps);
413 
414         if (sopt->DPs > MAX_DPs) {
415                 NL_SET_ERR_MSG_MOD(extack, "number of virtual queues too high");
416                 return -EINVAL;
417         }
418         if (sopt->DPs == 0) {
419                 NL_SET_ERR_MSG_MOD(extack,
420                                    "number of virtual queues can't be 0");
421                 return -EINVAL;
422         }
423         if (sopt->def_DP >= sopt->DPs) {
424                 NL_SET_ERR_MSG_MOD(extack, "default virtual queue above virtual queue count");
425                 return -EINVAL;
426         }
427         if (sopt->flags && gred_per_vq_red_flags_used(table)) {
428                 NL_SET_ERR_MSG_MOD(extack, "can't set per-Qdisc RED flags when per-virtual queue flags are used");
429                 return -EINVAL;
430         }
431 
432         sch_tree_lock(sch);
433         table->DPs = sopt->DPs;
434         table->def = sopt->def_DP;
435         red_flags_changed = table->red_flags != sopt->flags;
436         table->red_flags = sopt->flags;
437 
438         /*
439          * Every entry point to GRED is synchronized with the above code
440          * and the DP is checked against DPs, i.e. shadowed VQs can no
441          * longer be found so we can unlock right here.
442          */
443         sch_tree_unlock(sch);
444 
445         if (sopt->grio) {
446                 gred_enable_rio_mode(table);
447                 gred_disable_wred_mode(table);
448                 if (gred_wred_mode_check(sch))
449                         gred_enable_wred_mode(table);
450         } else {
451                 gred_disable_rio_mode(table);
452                 gred_disable_wred_mode(table);
453         }
454 
455         if (red_flags_changed)
456                 for (i = 0; i < table->DPs; i++)
457                         if (table->tab[i])
458                                 table->tab[i]->red_flags =
459                                         table->red_flags & GRED_VQ_RED_FLAGS;
460 
461         for (i = table->DPs; i < MAX_DPs; i++) {
462                 if (table->tab[i]) {
463                         pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n",
464                                 i);
465                         gred_destroy_vq(table->tab[i]);
466                         table->tab[i] = NULL;
467                 }
468         }
469 
470         gred_offload(sch, TC_GRED_REPLACE);
471         return 0;
472 }
473 
474 static inline int gred_change_vq(struct Qdisc *sch, int dp,
475                                  struct tc_gred_qopt *ctl, int prio,
476                                  u8 *stab, u32 max_P,
477                                  struct gred_sched_data **prealloc,
478                                  struct netlink_ext_ack *extack)
479 {
480         struct gred_sched *table = qdisc_priv(sch);
481         struct gred_sched_data *q = table->tab[dp];
482 
483         if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) {
484                 NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters");
485                 return -EINVAL;
486         }
487 
488         if (!q) {
489                 table->tab[dp] = q = *prealloc;
490                 *prealloc = NULL;
491                 if (!q)
492                         return -ENOMEM;
493                 q->red_flags = table->red_flags & GRED_VQ_RED_FLAGS;
494         }
495 
496         q->DP = dp;
497         q->prio = prio;
498         if (ctl->limit > sch->limit)
499                 q->limit = sch->limit;
500         else
501                 q->limit = ctl->limit;
502 
503         if (q->backlog == 0)
504                 red_end_of_idle_period(&q->vars);
505 
506         red_set_parms(&q->parms,
507                       ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
508                       ctl->Scell_log, stab, max_P);
509         red_set_vars(&q->vars);
510         return 0;
511 }
512 
513 static const struct nla_policy gred_vq_policy[TCA_GRED_VQ_MAX + 1] = {
514         [TCA_GRED_VQ_DP]        = { .type = NLA_U32 },
515         [TCA_GRED_VQ_FLAGS]     = { .type = NLA_U32 },
516 };
517 
518 static const struct nla_policy gred_vqe_policy[TCA_GRED_VQ_ENTRY_MAX + 1] = {
519         [TCA_GRED_VQ_ENTRY]     = { .type = NLA_NESTED },
520 };
521 
522 static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = {
523         [TCA_GRED_PARMS]        = { .len = sizeof(struct tc_gred_qopt) },
524         [TCA_GRED_STAB]         = { .len = 256 },
525         [TCA_GRED_DPS]          = { .len = sizeof(struct tc_gred_sopt) },
526         [TCA_GRED_MAX_P]        = { .type = NLA_U32 },
527         [TCA_GRED_LIMIT]        = { .type = NLA_U32 },
528         [TCA_GRED_VQ_LIST]      = { .type = NLA_NESTED },
529 };
530 
531 static void gred_vq_apply(struct gred_sched *table, const struct nlattr *entry)
532 {
533         struct nlattr *tb[TCA_GRED_VQ_MAX + 1];
534         u32 dp;
535 
536         nla_parse_nested_deprecated(tb, TCA_GRED_VQ_MAX, entry,
537                                     gred_vq_policy, NULL);
538 
539         dp = nla_get_u32(tb[TCA_GRED_VQ_DP]);
540 
541         if (tb[TCA_GRED_VQ_FLAGS])
542                 table->tab[dp]->red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]);
543 }
544 
545 static void gred_vqs_apply(struct gred_sched *table, struct nlattr *vqs)
546 {
547         const struct nlattr *attr;
548         int rem;
549 
550         nla_for_each_nested(attr, vqs, rem) {
551                 switch (nla_type(attr)) {
552                 case TCA_GRED_VQ_ENTRY:
553                         gred_vq_apply(table, attr);
554                         break;
555                 }
556         }
557 }
558 
559 static int gred_vq_validate(struct gred_sched *table, u32 cdp,
560                             const struct nlattr *entry,
561                             struct netlink_ext_ack *extack)
562 {
563         struct nlattr *tb[TCA_GRED_VQ_MAX + 1];
564         int err;
565         u32 dp;
566 
567         err = nla_parse_nested_deprecated(tb, TCA_GRED_VQ_MAX, entry,
568                                           gred_vq_policy, extack);
569         if (err < 0)
570                 return err;
571 
572         if (!tb[TCA_GRED_VQ_DP]) {
573                 NL_SET_ERR_MSG_MOD(extack, "Virtual queue with no index specified");
574                 return -EINVAL;
575         }
576         dp = nla_get_u32(tb[TCA_GRED_VQ_DP]);
577         if (dp >= table->DPs) {
578                 NL_SET_ERR_MSG_MOD(extack, "Virtual queue with index out of bounds");
579                 return -EINVAL;
580         }
581         if (dp != cdp && !table->tab[dp]) {
582                 NL_SET_ERR_MSG_MOD(extack, "Virtual queue not yet instantiated");
583                 return -EINVAL;
584         }
585 
586         if (tb[TCA_GRED_VQ_FLAGS]) {
587                 u32 red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]);
588 
589                 if (table->red_flags && table->red_flags != red_flags) {
590                         NL_SET_ERR_MSG_MOD(extack, "can't change per-virtual queue RED flags when per-Qdisc flags are used");
591                         return -EINVAL;
592                 }
593                 if (red_flags & ~GRED_VQ_RED_FLAGS) {
594                         NL_SET_ERR_MSG_MOD(extack,
595                                            "invalid RED flags specified");
596                         return -EINVAL;
597                 }
598         }
599 
600         return 0;
601 }
602 
603 static int gred_vqs_validate(struct gred_sched *table, u32 cdp,
604                              struct nlattr *vqs, struct netlink_ext_ack *extack)
605 {
606         const struct nlattr *attr;
607         int rem, err;
608 
609         err = nla_validate_nested_deprecated(vqs, TCA_GRED_VQ_ENTRY_MAX,
610                                              gred_vqe_policy, extack);
611         if (err < 0)
612                 return err;
613 
614         nla_for_each_nested(attr, vqs, rem) {
615                 switch (nla_type(attr)) {
616                 case TCA_GRED_VQ_ENTRY:
617                         err = gred_vq_validate(table, cdp, attr, extack);
618                         if (err)
619                                 return err;
620                         break;
621                 default:
622                         NL_SET_ERR_MSG_MOD(extack, "GRED_VQ_LIST can contain only entry attributes");
623                         return -EINVAL;
624                 }
625         }
626 
627         if (rem > 0) {
628                 NL_SET_ERR_MSG_MOD(extack, "Trailing data after parsing virtual queue list");
629                 return -EINVAL;
630         }
631 
632         return 0;
633 }
634 
635 static int gred_change(struct Qdisc *sch, struct nlattr *opt,
636                        struct netlink_ext_ack *extack)
637 {
638         struct gred_sched *table = qdisc_priv(sch);
639         struct tc_gred_qopt *ctl;
640         struct nlattr *tb[TCA_GRED_MAX + 1];
641         int err, prio = GRED_DEF_PRIO;
642         u8 *stab;
643         u32 max_P;
644         struct gred_sched_data *prealloc;
645 
646         if (opt == NULL)
647                 return -EINVAL;
648 
649         err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy,
650                                           extack);
651         if (err < 0)
652                 return err;
653 
654         if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) {
655                 if (tb[TCA_GRED_LIMIT] != NULL)
656                         sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
657                 return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
658         }
659 
660         if (tb[TCA_GRED_PARMS] == NULL ||
661             tb[TCA_GRED_STAB] == NULL ||
662             tb[TCA_GRED_LIMIT] != NULL) {
663                 NL_SET_ERR_MSG_MOD(extack, "can't configure Qdisc and virtual queue at the same time");
664                 return -EINVAL;
665         }
666 
667         max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0;
668 
669         ctl = nla_data(tb[TCA_GRED_PARMS]);
670         stab = nla_data(tb[TCA_GRED_STAB]);
671 
672         if (ctl->DP >= table->DPs) {
673                 NL_SET_ERR_MSG_MOD(extack, "virtual queue index above virtual queue count");
674                 return -EINVAL;
675         }
676 
677         if (tb[TCA_GRED_VQ_LIST]) {
678                 err = gred_vqs_validate(table, ctl->DP, tb[TCA_GRED_VQ_LIST],
679                                         extack);
680                 if (err)
681                         return err;
682         }
683 
684         if (gred_rio_mode(table)) {
685                 if (ctl->prio == 0) {
686                         int def_prio = GRED_DEF_PRIO;
687 
688                         if (table->tab[table->def])
689                                 def_prio = table->tab[table->def]->prio;
690 
691                         printk(KERN_DEBUG "GRED: DP %u does not have a prio "
692                                "setting default to %d\n", ctl->DP, def_prio);
693 
694                         prio = def_prio;
695                 } else
696                         prio = ctl->prio;
697         }
698 
699         prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
700         sch_tree_lock(sch);
701 
702         err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc,
703                              extack);
704         if (err < 0)
705                 goto err_unlock_free;
706 
707         if (tb[TCA_GRED_VQ_LIST])
708                 gred_vqs_apply(table, tb[TCA_GRED_VQ_LIST]);
709 
710         if (gred_rio_mode(table)) {
711                 gred_disable_wred_mode(table);
712                 if (gred_wred_mode_check(sch))
713                         gred_enable_wred_mode(table);
714         }
715 
716         sch_tree_unlock(sch);
717         kfree(prealloc);
718 
719         gred_offload(sch, TC_GRED_REPLACE);
720         return 0;
721 
722 err_unlock_free:
723         sch_tree_unlock(sch);
724         kfree(prealloc);
725         return err;
726 }
727 
728 static int gred_init(struct Qdisc *sch, struct nlattr *opt,
729                      struct netlink_ext_ack *extack)
730 {
731         struct nlattr *tb[TCA_GRED_MAX + 1];
732         int err;
733 
734         if (!opt)
735                 return -EINVAL;
736 
737         err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy,
738                                           extack);
739         if (err < 0)
740                 return err;
741 
742         if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) {
743                 NL_SET_ERR_MSG_MOD(extack,
744                                    "virtual queue configuration can't be specified at initialization time");
745                 return -EINVAL;
746         }
747 
748         if (tb[TCA_GRED_LIMIT])
749                 sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
750         else
751                 sch->limit = qdisc_dev(sch)->tx_queue_len
752                              * psched_mtu(qdisc_dev(sch));
753 
754         return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
755 }
756 
757 static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
758 {
759         struct gred_sched *table = qdisc_priv(sch);
760         struct nlattr *parms, *vqs, *opts = NULL;
761         int i;
762         u32 max_p[MAX_DPs];
763         struct tc_gred_sopt sopt = {
764                 .DPs    = table->DPs,
765                 .def_DP = table->def,
766                 .grio   = gred_rio_mode(table),
767                 .flags  = table->red_flags,
768         };
769 
770         if (gred_offload_dump_stats(sch))
771                 goto nla_put_failure;
772 
773         opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
774         if (opts == NULL)
775                 goto nla_put_failure;
776         if (nla_put(skb, TCA_GRED_DPS, sizeof(sopt), &sopt))
777                 goto nla_put_failure;
778 
779         for (i = 0; i < MAX_DPs; i++) {
780                 struct gred_sched_data *q = table->tab[i];
781 
782                 max_p[i] = q ? q->parms.max_P : 0;
783         }
784         if (nla_put(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p))
785                 goto nla_put_failure;
786 
787         if (nla_put_u32(skb, TCA_GRED_LIMIT, sch->limit))
788                 goto nla_put_failure;
789 
790         /* Old style all-in-one dump of VQs */
791         parms = nla_nest_start_noflag(skb, TCA_GRED_PARMS);
792         if (parms == NULL)
793                 goto nla_put_failure;
794 
795         for (i = 0; i < MAX_DPs; i++) {
796                 struct gred_sched_data *q = table->tab[i];
797                 struct tc_gred_qopt opt;
798                 unsigned long qavg;
799 
800                 memset(&opt, 0, sizeof(opt));
801 
802                 if (!q) {
803                         /* hack -- fix at some point with proper message
804                            This is how we indicate to tc that there is no VQ
805                            at this DP */
806 
807                         opt.DP = MAX_DPs + i;
808                         goto append_opt;
809                 }
810 
811                 opt.limit       = q->limit;
812                 opt.DP          = q->DP;
813                 opt.backlog     = gred_backlog(table, q, sch);
814                 opt.prio        = q->prio;
815                 opt.qth_min     = q->parms.qth_min >> q->parms.Wlog;
816                 opt.qth_max     = q->parms.qth_max >> q->parms.Wlog;
817                 opt.Wlog        = q->parms.Wlog;
818                 opt.Plog        = q->parms.Plog;
819                 opt.Scell_log   = q->parms.Scell_log;
820                 opt.other       = q->stats.other;
821                 opt.early       = q->stats.prob_drop;
822                 opt.forced      = q->stats.forced_drop;
823                 opt.pdrop       = q->stats.pdrop;
824                 opt.packets     = q->packetsin;
825                 opt.bytesin     = q->bytesin;
826 
827                 if (gred_wred_mode(table))
828                         gred_load_wred_set(table, q);
829 
830                 qavg = red_calc_qavg(&q->parms, &q->vars,
831                                      q->vars.qavg >> q->parms.Wlog);
832                 opt.qave = qavg >> q->parms.Wlog;
833 
834 append_opt:
835                 if (nla_append(skb, sizeof(opt), &opt) < 0)
836                         goto nla_put_failure;
837         }
838 
839         nla_nest_end(skb, parms);
840 
841         /* Dump the VQs again, in more structured way */
842         vqs = nla_nest_start_noflag(skb, TCA_GRED_VQ_LIST);
843         if (!vqs)
844                 goto nla_put_failure;
845 
846         for (i = 0; i < MAX_DPs; i++) {
847                 struct gred_sched_data *q = table->tab[i];
848                 struct nlattr *vq;
849 
850                 if (!q)
851                         continue;
852 
853                 vq = nla_nest_start_noflag(skb, TCA_GRED_VQ_ENTRY);
854                 if (!vq)
855                         goto nla_put_failure;
856 
857                 if (nla_put_u32(skb, TCA_GRED_VQ_DP, q->DP))
858                         goto nla_put_failure;
859 
860                 if (nla_put_u32(skb, TCA_GRED_VQ_FLAGS, q->red_flags))
861                         goto nla_put_failure;
862 
863                 /* Stats */
864                 if (nla_put_u64_64bit(skb, TCA_GRED_VQ_STAT_BYTES, q->bytesin,
865                                       TCA_GRED_VQ_PAD))
866                         goto nla_put_failure;
867                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PACKETS, q->packetsin))
868                         goto nla_put_failure;
869                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_BACKLOG,
870                                 gred_backlog(table, q, sch)))
871                         goto nla_put_failure;
872                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_DROP,
873                                 q->stats.prob_drop))
874                         goto nla_put_failure;
875                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_MARK,
876                                 q->stats.prob_mark))
877                         goto nla_put_failure;
878                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_DROP,
879                                 q->stats.forced_drop))
880                         goto nla_put_failure;
881                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_MARK,
882                                 q->stats.forced_mark))
883                         goto nla_put_failure;
884                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PDROP, q->stats.pdrop))
885                         goto nla_put_failure;
886                 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_OTHER, q->stats.other))
887                         goto nla_put_failure;
888 
889                 nla_nest_end(skb, vq);
890         }
891         nla_nest_end(skb, vqs);
892 
893         return nla_nest_end(skb, opts);
894 
895 nla_put_failure:
896         nla_nest_cancel(skb, opts);
897         return -EMSGSIZE;
898 }
899 
900 static void gred_destroy(struct Qdisc *sch)
901 {
902         struct gred_sched *table = qdisc_priv(sch);
903         int i;
904 
905         for (i = 0; i < table->DPs; i++) {
906                 if (table->tab[i])
907                         gred_destroy_vq(table->tab[i]);
908         }
909         gred_offload(sch, TC_GRED_DESTROY);
910 }
911 
912 static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
913         .id             =       "gred",
914         .priv_size      =       sizeof(struct gred_sched),
915         .enqueue        =       gred_enqueue,
916         .dequeue        =       gred_dequeue,
917         .peek           =       qdisc_peek_head,
918         .init           =       gred_init,
919         .reset          =       gred_reset,
920         .destroy        =       gred_destroy,
921         .change         =       gred_change,
922         .dump           =       gred_dump,
923         .owner          =       THIS_MODULE,
924 };
925 
926 static int __init gred_module_init(void)
927 {
928         return register_qdisc(&gred_qdisc_ops);
929 }
930 
931 static void __exit gred_module_exit(void)
932 {
933         unregister_qdisc(&gred_qdisc_ops);
934 }
935 
936 module_init(gred_module_init)
937 module_exit(gred_module_exit)
938 
939 MODULE_LICENSE("GPL");
940 

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