2 * net/sched/sch_gred.c Generic Random Early Detection queue.
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.
10 * Authors: J Hadi Salim (hadi@cyberus.ca) 1998-2002
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
18 * For all the glorious comments look at include/net/red.h
21 #include <linux/slab.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/skbuff.h>
26 #include <net/pkt_cls.h>
27 #include <net/pkt_sched.h>
30 #define GRED_DEF_PRIO (MAX_DPs / 2)
31 #define GRED_VQ_MASK (MAX_DPs - 1)
33 #define GRED_VQ_RED_FLAGS (TC_RED_ECN | TC_RED_HARDDROP)
35 struct gred_sched_data;
38 struct gred_sched_data {
39 u32 limit; /* HARD maximal queue length */
40 u32 DP; /* the drop parameters */
41 u32 red_flags; /* virtualQ version of red_flags */
42 u64 bytesin; /* bytes seen on virtualQ so far*/
43 u32 packetsin; /* packets seen on virtualQ so far*/
44 u32 backlog; /* bytes on the virtualQ */
45 u8 prio; /* the prio of this vq */
47 struct red_parms parms;
49 struct red_stats stats;
58 struct gred_sched_data *tab[MAX_DPs];
63 struct red_vars wred_set;
66 static inline int gred_wred_mode(struct gred_sched *table)
68 return test_bit(GRED_WRED_MODE, &table->flags);
71 static inline void gred_enable_wred_mode(struct gred_sched *table)
73 __set_bit(GRED_WRED_MODE, &table->flags);
76 static inline void gred_disable_wred_mode(struct gred_sched *table)
78 __clear_bit(GRED_WRED_MODE, &table->flags);
81 static inline int gred_rio_mode(struct gred_sched *table)
83 return test_bit(GRED_RIO_MODE, &table->flags);
86 static inline void gred_enable_rio_mode(struct gred_sched *table)
88 __set_bit(GRED_RIO_MODE, &table->flags);
91 static inline void gred_disable_rio_mode(struct gred_sched *table)
93 __clear_bit(GRED_RIO_MODE, &table->flags);
96 static inline int gred_wred_mode_check(struct Qdisc *sch)
98 struct gred_sched *table = qdisc_priv(sch);
101 /* Really ugly O(n^2) but shouldn't be necessary too frequent. */
102 for (i = 0; i < table->DPs; i++) {
103 struct gred_sched_data *q = table->tab[i];
109 for (n = i + 1; n < table->DPs; n++)
110 if (table->tab[n] && table->tab[n]->prio == q->prio)
117 static inline unsigned int gred_backlog(struct gred_sched *table,
118 struct gred_sched_data *q,
121 if (gred_wred_mode(table))
122 return sch->qstats.backlog;
127 static inline u16 tc_index_to_dp(struct sk_buff *skb)
129 return skb->tc_index & GRED_VQ_MASK;
132 static inline void gred_load_wred_set(const struct gred_sched *table,
133 struct gred_sched_data *q)
135 q->vars.qavg = table->wred_set.qavg;
136 q->vars.qidlestart = table->wred_set.qidlestart;
139 static inline void gred_store_wred_set(struct gred_sched *table,
140 struct gred_sched_data *q)
142 table->wred_set.qavg = q->vars.qavg;
143 table->wred_set.qidlestart = q->vars.qidlestart;
146 static int gred_use_ecn(struct gred_sched_data *q)
148 return q->red_flags & TC_RED_ECN;
151 static int gred_use_harddrop(struct gred_sched_data *q)
153 return q->red_flags & TC_RED_HARDDROP;
156 static bool gred_per_vq_red_flags_used(struct gred_sched *table)
160 /* Local per-vq flags couldn't have been set unless global are 0 */
161 if (table->red_flags)
163 for (i = 0; i < MAX_DPs; i++)
164 if (table->tab[i] && table->tab[i]->red_flags)
169 static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch,
170 struct sk_buff **to_free)
172 struct gred_sched_data *q = NULL;
173 struct gred_sched *t = qdisc_priv(sch);
174 unsigned long qavg = 0;
175 u16 dp = tc_index_to_dp(skb);
177 if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
182 /* Pass through packets not assigned to a DP
183 * if no default DP has been configured. This
184 * allows for DP flows to be left untouched.
186 if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <=
188 return qdisc_enqueue_tail(skb, sch);
193 /* fix tc_index? --could be controversial but needed for
195 skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp;
198 /* sum up all the qaves of prios < ours to get the new qave */
199 if (!gred_wred_mode(t) && gred_rio_mode(t)) {
202 for (i = 0; i < t->DPs; i++) {
203 if (t->tab[i] && t->tab[i]->prio < q->prio &&
204 !red_is_idling(&t->tab[i]->vars))
205 qavg += t->tab[i]->vars.qavg;
211 q->bytesin += qdisc_pkt_len(skb);
213 if (gred_wred_mode(t))
214 gred_load_wred_set(t, q);
216 q->vars.qavg = red_calc_qavg(&q->parms,
218 gred_backlog(t, q, sch));
220 if (red_is_idling(&q->vars))
221 red_end_of_idle_period(&q->vars);
223 if (gred_wred_mode(t))
224 gred_store_wred_set(t, q);
226 switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) {
231 qdisc_qstats_overlimit(sch);
232 if (!gred_use_ecn(q) || !INET_ECN_set_ce(skb)) {
233 q->stats.prob_drop++;
234 goto congestion_drop;
237 q->stats.prob_mark++;
241 qdisc_qstats_overlimit(sch);
242 if (gred_use_harddrop(q) || !gred_use_ecn(q) ||
243 !INET_ECN_set_ce(skb)) {
244 q->stats.forced_drop++;
245 goto congestion_drop;
247 q->stats.forced_mark++;
251 if (gred_backlog(t, q, sch) + qdisc_pkt_len(skb) <= q->limit) {
252 q->backlog += qdisc_pkt_len(skb);
253 return qdisc_enqueue_tail(skb, sch);
258 return qdisc_drop(skb, sch, to_free);
261 qdisc_drop(skb, sch, to_free);
265 static struct sk_buff *gred_dequeue(struct Qdisc *sch)
268 struct gred_sched *t = qdisc_priv(sch);
270 skb = qdisc_dequeue_head(sch);
273 struct gred_sched_data *q;
274 u16 dp = tc_index_to_dp(skb);
276 if (dp >= t->DPs || (q = t->tab[dp]) == NULL) {
277 net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x after dequeue, screwing up backlog\n",
278 tc_index_to_dp(skb));
280 q->backlog -= qdisc_pkt_len(skb);
282 if (gred_wred_mode(t)) {
283 if (!sch->qstats.backlog)
284 red_start_of_idle_period(&t->wred_set);
287 red_start_of_idle_period(&q->vars);
297 static void gred_reset(struct Qdisc *sch)
300 struct gred_sched *t = qdisc_priv(sch);
302 qdisc_reset_queue(sch);
304 for (i = 0; i < t->DPs; i++) {
305 struct gred_sched_data *q = t->tab[i];
310 red_restart(&q->vars);
315 static void gred_offload(struct Qdisc *sch, enum tc_gred_command command)
317 struct gred_sched *table = qdisc_priv(sch);
318 struct net_device *dev = qdisc_dev(sch);
319 struct tc_gred_qopt_offload opt = {
321 .handle = sch->handle,
322 .parent = sch->parent,
325 if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
328 if (command == TC_GRED_REPLACE) {
331 opt.set.grio_on = gred_rio_mode(table);
332 opt.set.wred_on = gred_wred_mode(table);
333 opt.set.dp_cnt = table->DPs;
334 opt.set.dp_def = table->def;
336 for (i = 0; i < table->DPs; i++) {
337 struct gred_sched_data *q = table->tab[i];
341 opt.set.tab[i].present = true;
342 opt.set.tab[i].limit = q->limit;
343 opt.set.tab[i].prio = q->prio;
344 opt.set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
345 opt.set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
346 opt.set.tab[i].is_ecn = gred_use_ecn(q);
347 opt.set.tab[i].is_harddrop = gred_use_harddrop(q);
348 opt.set.tab[i].probability = q->parms.max_P;
349 opt.set.tab[i].backlog = &q->backlog;
351 opt.set.qstats = &sch->qstats;
354 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, &opt);
357 static int gred_offload_dump_stats(struct Qdisc *sch)
359 struct gred_sched *table = qdisc_priv(sch);
360 struct tc_gred_qopt_offload *hw_stats;
364 hw_stats = kzalloc(sizeof(*hw_stats), GFP_KERNEL);
368 hw_stats->command = TC_GRED_STATS;
369 hw_stats->handle = sch->handle;
370 hw_stats->parent = sch->parent;
372 for (i = 0; i < MAX_DPs; i++)
374 hw_stats->stats.xstats[i] = &table->tab[i]->stats;
376 ret = qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_GRED, hw_stats);
377 /* Even if driver returns failure adjust the stats - in case offload
378 * ended but driver still wants to adjust the values.
380 for (i = 0; i < MAX_DPs; i++) {
383 table->tab[i]->packetsin += hw_stats->stats.bstats[i].packets;
384 table->tab[i]->bytesin += hw_stats->stats.bstats[i].bytes;
385 table->tab[i]->backlog += hw_stats->stats.qstats[i].backlog;
387 _bstats_update(&sch->bstats,
388 hw_stats->stats.bstats[i].bytes,
389 hw_stats->stats.bstats[i].packets);
390 sch->qstats.qlen += hw_stats->stats.qstats[i].qlen;
391 sch->qstats.backlog += hw_stats->stats.qstats[i].backlog;
392 sch->qstats.drops += hw_stats->stats.qstats[i].drops;
393 sch->qstats.requeues += hw_stats->stats.qstats[i].requeues;
394 sch->qstats.overlimits += hw_stats->stats.qstats[i].overlimits;
401 static inline void gred_destroy_vq(struct gred_sched_data *q)
406 static int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps,
407 struct netlink_ext_ack *extack)
409 struct gred_sched *table = qdisc_priv(sch);
410 struct tc_gred_sopt *sopt;
411 bool red_flags_changed;
417 sopt = nla_data(dps);
419 if (sopt->DPs > MAX_DPs) {
420 NL_SET_ERR_MSG_MOD(extack, "number of virtual queues too high");
423 if (sopt->DPs == 0) {
424 NL_SET_ERR_MSG_MOD(extack,
425 "number of virtual queues can't be 0");
428 if (sopt->def_DP >= sopt->DPs) {
429 NL_SET_ERR_MSG_MOD(extack, "default virtual queue above virtual queue count");
432 if (sopt->flags && gred_per_vq_red_flags_used(table)) {
433 NL_SET_ERR_MSG_MOD(extack, "can't set per-Qdisc RED flags when per-virtual queue flags are used");
438 table->DPs = sopt->DPs;
439 table->def = sopt->def_DP;
440 red_flags_changed = table->red_flags != sopt->flags;
441 table->red_flags = sopt->flags;
444 * Every entry point to GRED is synchronized with the above code
445 * and the DP is checked against DPs, i.e. shadowed VQs can no
446 * longer be found so we can unlock right here.
448 sch_tree_unlock(sch);
451 gred_enable_rio_mode(table);
452 gred_disable_wred_mode(table);
453 if (gred_wred_mode_check(sch))
454 gred_enable_wred_mode(table);
456 gred_disable_rio_mode(table);
457 gred_disable_wred_mode(table);
460 if (red_flags_changed)
461 for (i = 0; i < table->DPs; i++)
463 table->tab[i]->red_flags =
464 table->red_flags & GRED_VQ_RED_FLAGS;
466 for (i = table->DPs; i < MAX_DPs; i++) {
468 pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n",
470 gred_destroy_vq(table->tab[i]);
471 table->tab[i] = NULL;
475 gred_offload(sch, TC_GRED_REPLACE);
479 static inline int gred_change_vq(struct Qdisc *sch, int dp,
480 struct tc_gred_qopt *ctl, int prio,
482 struct gred_sched_data **prealloc,
483 struct netlink_ext_ack *extack)
485 struct gred_sched *table = qdisc_priv(sch);
486 struct gred_sched_data *q = table->tab[dp];
488 if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) {
489 NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters");
494 table->tab[dp] = q = *prealloc;
498 q->red_flags = table->red_flags & GRED_VQ_RED_FLAGS;
503 if (ctl->limit > sch->limit)
504 q->limit = sch->limit;
506 q->limit = ctl->limit;
509 red_end_of_idle_period(&q->vars);
511 red_set_parms(&q->parms,
512 ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog,
513 ctl->Scell_log, stab, max_P);
514 red_set_vars(&q->vars);
518 static const struct nla_policy gred_vq_policy[TCA_GRED_VQ_MAX + 1] = {
519 [TCA_GRED_VQ_DP] = { .type = NLA_U32 },
520 [TCA_GRED_VQ_FLAGS] = { .type = NLA_U32 },
523 static const struct nla_policy gred_vqe_policy[TCA_GRED_VQ_ENTRY_MAX + 1] = {
524 [TCA_GRED_VQ_ENTRY] = { .type = NLA_NESTED },
527 static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = {
528 [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) },
529 [TCA_GRED_STAB] = { .len = 256 },
530 [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) },
531 [TCA_GRED_MAX_P] = { .type = NLA_U32 },
532 [TCA_GRED_LIMIT] = { .type = NLA_U32 },
533 [TCA_GRED_VQ_LIST] = { .type = NLA_NESTED },
536 static void gred_vq_apply(struct gred_sched *table, const struct nlattr *entry)
538 struct nlattr *tb[TCA_GRED_VQ_MAX + 1];
541 nla_parse_nested(tb, TCA_GRED_VQ_MAX, entry, gred_vq_policy, NULL);
543 dp = nla_get_u32(tb[TCA_GRED_VQ_DP]);
545 if (tb[TCA_GRED_VQ_FLAGS])
546 table->tab[dp]->red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]);
549 static void gred_vqs_apply(struct gred_sched *table, struct nlattr *vqs)
551 const struct nlattr *attr;
554 nla_for_each_nested(attr, vqs, rem) {
555 switch (nla_type(attr)) {
556 case TCA_GRED_VQ_ENTRY:
557 gred_vq_apply(table, attr);
563 static int gred_vq_validate(struct gred_sched *table, u32 cdp,
564 const struct nlattr *entry,
565 struct netlink_ext_ack *extack)
567 struct nlattr *tb[TCA_GRED_VQ_MAX + 1];
571 err = nla_parse_nested(tb, TCA_GRED_VQ_MAX, entry, gred_vq_policy,
576 if (!tb[TCA_GRED_VQ_DP]) {
577 NL_SET_ERR_MSG_MOD(extack, "Virtual queue with no index specified");
580 dp = nla_get_u32(tb[TCA_GRED_VQ_DP]);
581 if (dp >= table->DPs) {
582 NL_SET_ERR_MSG_MOD(extack, "Virtual queue with index out of bounds");
585 if (dp != cdp && !table->tab[dp]) {
586 NL_SET_ERR_MSG_MOD(extack, "Virtual queue not yet instantiated");
590 if (tb[TCA_GRED_VQ_FLAGS]) {
591 u32 red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]);
593 if (table->red_flags && table->red_flags != red_flags) {
594 NL_SET_ERR_MSG_MOD(extack, "can't change per-virtual queue RED flags when per-Qdisc flags are used");
597 if (red_flags & ~GRED_VQ_RED_FLAGS) {
598 NL_SET_ERR_MSG_MOD(extack,
599 "invalid RED flags specified");
607 static int gred_vqs_validate(struct gred_sched *table, u32 cdp,
608 struct nlattr *vqs, struct netlink_ext_ack *extack)
610 const struct nlattr *attr;
613 err = nla_validate_nested(vqs, TCA_GRED_VQ_ENTRY_MAX,
614 gred_vqe_policy, extack);
618 nla_for_each_nested(attr, vqs, rem) {
619 switch (nla_type(attr)) {
620 case TCA_GRED_VQ_ENTRY:
621 err = gred_vq_validate(table, cdp, attr, extack);
626 NL_SET_ERR_MSG_MOD(extack, "GRED_VQ_LIST can contain only entry attributes");
632 NL_SET_ERR_MSG_MOD(extack, "Trailing data after parsing virtual queue list");
639 static int gred_change(struct Qdisc *sch, struct nlattr *opt,
640 struct netlink_ext_ack *extack)
642 struct gred_sched *table = qdisc_priv(sch);
643 struct tc_gred_qopt *ctl;
644 struct nlattr *tb[TCA_GRED_MAX + 1];
645 int err, prio = GRED_DEF_PRIO;
648 struct gred_sched_data *prealloc;
653 err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, extack);
657 if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) {
658 if (tb[TCA_GRED_LIMIT] != NULL)
659 sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
660 return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
663 if (tb[TCA_GRED_PARMS] == NULL ||
664 tb[TCA_GRED_STAB] == NULL ||
665 tb[TCA_GRED_LIMIT] != NULL) {
666 NL_SET_ERR_MSG_MOD(extack, "can't configure Qdisc and virtual queue at the same time");
670 max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0;
672 ctl = nla_data(tb[TCA_GRED_PARMS]);
673 stab = nla_data(tb[TCA_GRED_STAB]);
675 if (ctl->DP >= table->DPs) {
676 NL_SET_ERR_MSG_MOD(extack, "virtual queue index above virtual queue count");
680 if (tb[TCA_GRED_VQ_LIST]) {
681 err = gred_vqs_validate(table, ctl->DP, tb[TCA_GRED_VQ_LIST],
687 if (gred_rio_mode(table)) {
688 if (ctl->prio == 0) {
689 int def_prio = GRED_DEF_PRIO;
691 if (table->tab[table->def])
692 def_prio = table->tab[table->def]->prio;
694 printk(KERN_DEBUG "GRED: DP %u does not have a prio "
695 "setting default to %d\n", ctl->DP, def_prio);
702 prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
705 err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc,
708 goto err_unlock_free;
710 if (tb[TCA_GRED_VQ_LIST])
711 gred_vqs_apply(table, tb[TCA_GRED_VQ_LIST]);
713 if (gred_rio_mode(table)) {
714 gred_disable_wred_mode(table);
715 if (gred_wred_mode_check(sch))
716 gred_enable_wred_mode(table);
719 sch_tree_unlock(sch);
722 gred_offload(sch, TC_GRED_REPLACE);
726 sch_tree_unlock(sch);
731 static int gred_init(struct Qdisc *sch, struct nlattr *opt,
732 struct netlink_ext_ack *extack)
734 struct nlattr *tb[TCA_GRED_MAX + 1];
740 err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy, extack);
744 if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) {
745 NL_SET_ERR_MSG_MOD(extack,
746 "virtual queue configuration can't be specified at initialization time");
750 if (tb[TCA_GRED_LIMIT])
751 sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]);
753 sch->limit = qdisc_dev(sch)->tx_queue_len
754 * psched_mtu(qdisc_dev(sch));
756 return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
759 static int gred_dump(struct Qdisc *sch, struct sk_buff *skb)
761 struct gred_sched *table = qdisc_priv(sch);
762 struct nlattr *parms, *vqs, *opts = NULL;
765 struct tc_gred_sopt sopt = {
767 .def_DP = table->def,
768 .grio = gred_rio_mode(table),
769 .flags = table->red_flags,
772 if (gred_offload_dump_stats(sch))
773 goto nla_put_failure;
775 opts = nla_nest_start(skb, TCA_OPTIONS);
777 goto nla_put_failure;
778 if (nla_put(skb, TCA_GRED_DPS, sizeof(sopt), &sopt))
779 goto nla_put_failure;
781 for (i = 0; i < MAX_DPs; i++) {
782 struct gred_sched_data *q = table->tab[i];
784 max_p[i] = q ? q->parms.max_P : 0;
786 if (nla_put(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p))
787 goto nla_put_failure;
789 if (nla_put_u32(skb, TCA_GRED_LIMIT, sch->limit))
790 goto nla_put_failure;
792 /* Old style all-in-one dump of VQs */
793 parms = nla_nest_start(skb, TCA_GRED_PARMS);
795 goto nla_put_failure;
797 for (i = 0; i < MAX_DPs; i++) {
798 struct gred_sched_data *q = table->tab[i];
799 struct tc_gred_qopt opt;
802 memset(&opt, 0, sizeof(opt));
805 /* hack -- fix at some point with proper message
806 This is how we indicate to tc that there is no VQ
809 opt.DP = MAX_DPs + i;
813 opt.limit = q->limit;
815 opt.backlog = gred_backlog(table, q, sch);
817 opt.qth_min = q->parms.qth_min >> q->parms.Wlog;
818 opt.qth_max = q->parms.qth_max >> q->parms.Wlog;
819 opt.Wlog = q->parms.Wlog;
820 opt.Plog = q->parms.Plog;
821 opt.Scell_log = q->parms.Scell_log;
822 opt.other = q->stats.other;
823 opt.early = q->stats.prob_drop;
824 opt.forced = q->stats.forced_drop;
825 opt.pdrop = q->stats.pdrop;
826 opt.packets = q->packetsin;
827 opt.bytesin = q->bytesin;
829 if (gred_wred_mode(table))
830 gred_load_wred_set(table, q);
832 qavg = red_calc_qavg(&q->parms, &q->vars,
833 q->vars.qavg >> q->parms.Wlog);
834 opt.qave = qavg >> q->parms.Wlog;
837 if (nla_append(skb, sizeof(opt), &opt) < 0)
838 goto nla_put_failure;
841 nla_nest_end(skb, parms);
843 /* Dump the VQs again, in more structured way */
844 vqs = nla_nest_start(skb, TCA_GRED_VQ_LIST);
846 goto nla_put_failure;
848 for (i = 0; i < MAX_DPs; i++) {
849 struct gred_sched_data *q = table->tab[i];
855 vq = nla_nest_start(skb, TCA_GRED_VQ_ENTRY);
857 goto nla_put_failure;
859 if (nla_put_u32(skb, TCA_GRED_VQ_DP, q->DP))
860 goto nla_put_failure;
862 if (nla_put_u32(skb, TCA_GRED_VQ_FLAGS, q->red_flags))
863 goto nla_put_failure;
866 if (nla_put_u64_64bit(skb, TCA_GRED_VQ_STAT_BYTES, q->bytesin,
868 goto nla_put_failure;
869 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PACKETS, q->packetsin))
870 goto nla_put_failure;
871 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_BACKLOG,
872 gred_backlog(table, q, sch)))
873 goto nla_put_failure;
874 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_DROP,
876 goto nla_put_failure;
877 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_MARK,
879 goto nla_put_failure;
880 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_DROP,
881 q->stats.forced_drop))
882 goto nla_put_failure;
883 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_MARK,
884 q->stats.forced_mark))
885 goto nla_put_failure;
886 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PDROP, q->stats.pdrop))
887 goto nla_put_failure;
888 if (nla_put_u32(skb, TCA_GRED_VQ_STAT_OTHER, q->stats.other))
889 goto nla_put_failure;
891 nla_nest_end(skb, vq);
893 nla_nest_end(skb, vqs);
895 return nla_nest_end(skb, opts);
898 nla_nest_cancel(skb, opts);
902 static void gred_destroy(struct Qdisc *sch)
904 struct gred_sched *table = qdisc_priv(sch);
907 for (i = 0; i < table->DPs; i++) {
909 gred_destroy_vq(table->tab[i]);
911 gred_offload(sch, TC_GRED_DESTROY);
914 static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
916 .priv_size = sizeof(struct gred_sched),
917 .enqueue = gred_enqueue,
918 .dequeue = gred_dequeue,
919 .peek = qdisc_peek_head,
922 .destroy = gred_destroy,
923 .change = gred_change,
925 .owner = THIS_MODULE,
928 static int __init gred_module_init(void)
930 return register_qdisc(&gred_qdisc_ops);
933 static void __exit gred_module_exit(void)
935 unregister_qdisc(&gred_qdisc_ops);
938 module_init(gred_module_init)
939 module_exit(gred_module_exit)
941 MODULE_LICENSE("GPL");