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Diffstat (limited to 'net/sched/sch_cbq.c')
| -rw-r--r-- | net/sched/sch_cbq.c | 1727 |
1 files changed, 1727 insertions, 0 deletions
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c new file mode 100644 index 000000000..36db5f678 --- /dev/null +++ b/net/sched/sch_cbq.c @@ -0,0 +1,1727 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/sch_cbq.c Class-Based Queueing discipline. + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/skbuff.h> +#include <net/netlink.h> +#include <net/pkt_sched.h> +#include <net/pkt_cls.h> + + +/* Class-Based Queueing (CBQ) algorithm. + ======================================= + + Sources: [1] Sally Floyd and Van Jacobson, "Link-sharing and Resource + Management Models for Packet Networks", + IEEE/ACM Transactions on Networking, Vol.3, No.4, 1995 + + [2] Sally Floyd, "Notes on CBQ and Guaranteed Service", 1995 + + [3] Sally Floyd, "Notes on Class-Based Queueing: Setting + Parameters", 1996 + + [4] Sally Floyd and Michael Speer, "Experimental Results + for Class-Based Queueing", 1998, not published. + + ----------------------------------------------------------------------- + + Algorithm skeleton was taken from NS simulator cbq.cc. + If someone wants to check this code against the LBL version, + he should take into account that ONLY the skeleton was borrowed, + the implementation is different. Particularly: + + --- The WRR algorithm is different. Our version looks more + reasonable (I hope) and works when quanta are allowed to be + less than MTU, which is always the case when real time classes + have small rates. Note, that the statement of [3] is + incomplete, delay may actually be estimated even if class + per-round allotment is less than MTU. Namely, if per-round + allotment is W*r_i, and r_1+...+r_k = r < 1 + + delay_i <= ([MTU/(W*r_i)]*W*r + W*r + k*MTU)/B + + In the worst case we have IntServ estimate with D = W*r+k*MTU + and C = MTU*r. The proof (if correct at all) is trivial. + + + --- It seems that cbq-2.0 is not very accurate. At least, I cannot + interpret some places, which look like wrong translations + from NS. Anyone is advised to find these differences + and explain to me, why I am wrong 8). + + --- Linux has no EOI event, so that we cannot estimate true class + idle time. Workaround is to consider the next dequeue event + as sign that previous packet is finished. This is wrong because of + internal device queueing, but on a permanently loaded link it is true. + Moreover, combined with clock integrator, this scheme looks + very close to an ideal solution. */ + +struct cbq_sched_data; + + +struct cbq_class { + struct Qdisc_class_common common; + struct cbq_class *next_alive; /* next class with backlog in this priority band */ + +/* Parameters */ + unsigned char priority; /* class priority */ + unsigned char priority2; /* priority to be used after overlimit */ + unsigned char ewma_log; /* time constant for idle time calculation */ + + u32 defmap; + + /* Link-sharing scheduler parameters */ + long maxidle; /* Class parameters: see below. */ + long offtime; + long minidle; + u32 avpkt; + struct qdisc_rate_table *R_tab; + + /* General scheduler (WRR) parameters */ + long allot; + long quantum; /* Allotment per WRR round */ + long weight; /* Relative allotment: see below */ + + struct Qdisc *qdisc; /* Ptr to CBQ discipline */ + struct cbq_class *split; /* Ptr to split node */ + struct cbq_class *share; /* Ptr to LS parent in the class tree */ + struct cbq_class *tparent; /* Ptr to tree parent in the class tree */ + struct cbq_class *borrow; /* NULL if class is bandwidth limited; + parent otherwise */ + struct cbq_class *sibling; /* Sibling chain */ + struct cbq_class *children; /* Pointer to children chain */ + + struct Qdisc *q; /* Elementary queueing discipline */ + + +/* Variables */ + unsigned char cpriority; /* Effective priority */ + unsigned char delayed; + unsigned char level; /* level of the class in hierarchy: + 0 for leaf classes, and maximal + level of children + 1 for nodes. + */ + + psched_time_t last; /* Last end of service */ + psched_time_t undertime; + long avgidle; + long deficit; /* Saved deficit for WRR */ + psched_time_t penalized; + struct gnet_stats_basic_sync bstats; + struct gnet_stats_queue qstats; + struct net_rate_estimator __rcu *rate_est; + struct tc_cbq_xstats xstats; + + struct tcf_proto __rcu *filter_list; + struct tcf_block *block; + + int filters; + + struct cbq_class *defaults[TC_PRIO_MAX + 1]; +}; + +struct cbq_sched_data { + struct Qdisc_class_hash clhash; /* Hash table of all classes */ + int nclasses[TC_CBQ_MAXPRIO + 1]; + unsigned int quanta[TC_CBQ_MAXPRIO + 1]; + + struct cbq_class link; + + unsigned int activemask; + struct cbq_class *active[TC_CBQ_MAXPRIO + 1]; /* List of all classes + with backlog */ + +#ifdef CONFIG_NET_CLS_ACT + struct cbq_class *rx_class; +#endif + struct cbq_class *tx_class; + struct cbq_class *tx_borrowed; + int tx_len; + psched_time_t now; /* Cached timestamp */ + unsigned int pmask; + + struct qdisc_watchdog watchdog; /* Watchdog timer, + started when CBQ has + backlog, but cannot + transmit just now */ + psched_tdiff_t wd_expires; + int toplevel; + u32 hgenerator; +}; + + +#define L2T(cl, len) qdisc_l2t((cl)->R_tab, len) + +static inline struct cbq_class * +cbq_class_lookup(struct cbq_sched_data *q, u32 classid) +{ + struct Qdisc_class_common *clc; + + clc = qdisc_class_find(&q->clhash, classid); + if (clc == NULL) + return NULL; + return container_of(clc, struct cbq_class, common); +} + +#ifdef CONFIG_NET_CLS_ACT + +static struct cbq_class * +cbq_reclassify(struct sk_buff *skb, struct cbq_class *this) +{ + struct cbq_class *cl; + + for (cl = this->tparent; cl; cl = cl->tparent) { + struct cbq_class *new = cl->defaults[TC_PRIO_BESTEFFORT]; + + if (new != NULL && new != this) + return new; + } + return NULL; +} + +#endif + +/* Classify packet. The procedure is pretty complicated, but + * it allows us to combine link sharing and priority scheduling + * transparently. + * + * Namely, you can put link sharing rules (f.e. route based) at root of CBQ, + * so that it resolves to split nodes. Then packets are classified + * by logical priority, or a more specific classifier may be attached + * to the split node. + */ + +static struct cbq_class * +cbq_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *head = &q->link; + struct cbq_class **defmap; + struct cbq_class *cl = NULL; + u32 prio = skb->priority; + struct tcf_proto *fl; + struct tcf_result res; + + /* + * Step 1. If skb->priority points to one of our classes, use it. + */ + if (TC_H_MAJ(prio ^ sch->handle) == 0 && + (cl = cbq_class_lookup(q, prio)) != NULL) + return cl; + + *qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; + for (;;) { + int result = 0; + defmap = head->defaults; + + fl = rcu_dereference_bh(head->filter_list); + /* + * Step 2+n. Apply classifier. + */ + result = tcf_classify(skb, NULL, fl, &res, true); + if (!fl || result < 0) + goto fallback; + if (result == TC_ACT_SHOT) + return NULL; + + cl = (void *)res.class; + if (!cl) { + if (TC_H_MAJ(res.classid)) + cl = cbq_class_lookup(q, res.classid); + else if ((cl = defmap[res.classid & TC_PRIO_MAX]) == NULL) + cl = defmap[TC_PRIO_BESTEFFORT]; + + if (cl == NULL) + goto fallback; + } + if (cl->level >= head->level) + goto fallback; +#ifdef CONFIG_NET_CLS_ACT + switch (result) { + case TC_ACT_QUEUED: + case TC_ACT_STOLEN: + case TC_ACT_TRAP: + *qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; + fallthrough; + case TC_ACT_RECLASSIFY: + return cbq_reclassify(skb, cl); + } +#endif + if (cl->level == 0) + return cl; + + /* + * Step 3+n. If classifier selected a link sharing class, + * apply agency specific classifier. + * Repeat this procedure until we hit a leaf node. + */ + head = cl; + } + +fallback: + cl = head; + + /* + * Step 4. No success... + */ + if (TC_H_MAJ(prio) == 0 && + !(cl = head->defaults[prio & TC_PRIO_MAX]) && + !(cl = head->defaults[TC_PRIO_BESTEFFORT])) + return head; + + return cl; +} + +/* + * A packet has just been enqueued on the empty class. + * cbq_activate_class adds it to the tail of active class list + * of its priority band. + */ + +static inline void cbq_activate_class(struct cbq_class *cl) +{ + struct cbq_sched_data *q = qdisc_priv(cl->qdisc); + int prio = cl->cpriority; + struct cbq_class *cl_tail; + + cl_tail = q->active[prio]; + q->active[prio] = cl; + + if (cl_tail != NULL) { + cl->next_alive = cl_tail->next_alive; + cl_tail->next_alive = cl; + } else { + cl->next_alive = cl; + q->activemask |= (1<<prio); + } +} + +/* + * Unlink class from active chain. + * Note that this same procedure is done directly in cbq_dequeue* + * during round-robin procedure. + */ + +static void cbq_deactivate_class(struct cbq_class *this) +{ + struct cbq_sched_data *q = qdisc_priv(this->qdisc); + int prio = this->cpriority; + struct cbq_class *cl; + struct cbq_class *cl_prev = q->active[prio]; + + do { + cl = cl_prev->next_alive; + if (cl == this) { + cl_prev->next_alive = cl->next_alive; + cl->next_alive = NULL; + + if (cl == q->active[prio]) { + q->active[prio] = cl_prev; + if (cl == q->active[prio]) { + q->active[prio] = NULL; + q->activemask &= ~(1<<prio); + return; + } + } + return; + } + } while ((cl_prev = cl) != q->active[prio]); +} + +static void +cbq_mark_toplevel(struct cbq_sched_data *q, struct cbq_class *cl) +{ + int toplevel = q->toplevel; + + if (toplevel > cl->level) { + psched_time_t now = psched_get_time(); + + do { + if (cl->undertime < now) { + q->toplevel = cl->level; + return; + } + } while ((cl = cl->borrow) != NULL && toplevel > cl->level); + } +} + +static int +cbq_enqueue(struct sk_buff *skb, struct Qdisc *sch, + struct sk_buff **to_free) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + int ret; + struct cbq_class *cl = cbq_classify(skb, sch, &ret); + +#ifdef CONFIG_NET_CLS_ACT + q->rx_class = cl; +#endif + if (cl == NULL) { + if (ret & __NET_XMIT_BYPASS) + qdisc_qstats_drop(sch); + __qdisc_drop(skb, to_free); + return ret; + } + + ret = qdisc_enqueue(skb, cl->q, to_free); + if (ret == NET_XMIT_SUCCESS) { + sch->q.qlen++; + cbq_mark_toplevel(q, cl); + if (!cl->next_alive) + cbq_activate_class(cl); + return ret; + } + + if (net_xmit_drop_count(ret)) { + qdisc_qstats_drop(sch); + cbq_mark_toplevel(q, cl); + cl->qstats.drops++; + } + return ret; +} + +/* Overlimit action: penalize leaf class by adding offtime */ +static void cbq_overlimit(struct cbq_class *cl) +{ + struct cbq_sched_data *q = qdisc_priv(cl->qdisc); + psched_tdiff_t delay = cl->undertime - q->now; + + if (!cl->delayed) { + delay += cl->offtime; + + /* + * Class goes to sleep, so that it will have no + * chance to work avgidle. Let's forgive it 8) + * + * BTW cbq-2.0 has a crap in this + * place, apparently they forgot to shift it by cl->ewma_log. + */ + if (cl->avgidle < 0) + delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); + if (cl->avgidle < cl->minidle) + cl->avgidle = cl->minidle; + if (delay <= 0) + delay = 1; + cl->undertime = q->now + delay; + + cl->xstats.overactions++; + cl->delayed = 1; + } + if (q->wd_expires == 0 || q->wd_expires > delay) + q->wd_expires = delay; + + /* Dirty work! We must schedule wakeups based on + * real available rate, rather than leaf rate, + * which may be tiny (even zero). + */ + if (q->toplevel == TC_CBQ_MAXLEVEL) { + struct cbq_class *b; + psched_tdiff_t base_delay = q->wd_expires; + + for (b = cl->borrow; b; b = b->borrow) { + delay = b->undertime - q->now; + if (delay < base_delay) { + if (delay <= 0) + delay = 1; + base_delay = delay; + } + } + + q->wd_expires = base_delay; + } +} + +/* + * It is mission critical procedure. + * + * We "regenerate" toplevel cutoff, if transmitting class + * has backlog and it is not regulated. It is not part of + * original CBQ description, but looks more reasonable. + * Probably, it is wrong. This question needs further investigation. + */ + +static inline void +cbq_update_toplevel(struct cbq_sched_data *q, struct cbq_class *cl, + struct cbq_class *borrowed) +{ + if (cl && q->toplevel >= borrowed->level) { + if (cl->q->q.qlen > 1) { + do { + if (borrowed->undertime == PSCHED_PASTPERFECT) { + q->toplevel = borrowed->level; + return; + } + } while ((borrowed = borrowed->borrow) != NULL); + } +#if 0 + /* It is not necessary now. Uncommenting it + will save CPU cycles, but decrease fairness. + */ + q->toplevel = TC_CBQ_MAXLEVEL; +#endif + } +} + +static void +cbq_update(struct cbq_sched_data *q) +{ + struct cbq_class *this = q->tx_class; + struct cbq_class *cl = this; + int len = q->tx_len; + psched_time_t now; + + q->tx_class = NULL; + /* Time integrator. We calculate EOS time + * by adding expected packet transmission time. + */ + now = q->now + L2T(&q->link, len); + + for ( ; cl; cl = cl->share) { + long avgidle = cl->avgidle; + long idle; + + _bstats_update(&cl->bstats, len, 1); + + /* + * (now - last) is total time between packet right edges. + * (last_pktlen/rate) is "virtual" busy time, so that + * + * idle = (now - last) - last_pktlen/rate + */ + + idle = now - cl->last; + if ((unsigned long)idle > 128*1024*1024) { + avgidle = cl->maxidle; + } else { + idle -= L2T(cl, len); + + /* true_avgidle := (1-W)*true_avgidle + W*idle, + * where W=2^{-ewma_log}. But cl->avgidle is scaled: + * cl->avgidle == true_avgidle/W, + * hence: + */ + avgidle += idle - (avgidle>>cl->ewma_log); + } + + if (avgidle <= 0) { + /* Overlimit or at-limit */ + + if (avgidle < cl->minidle) + avgidle = cl->minidle; + + cl->avgidle = avgidle; + + /* Calculate expected time, when this class + * will be allowed to send. + * It will occur, when: + * (1-W)*true_avgidle + W*delay = 0, i.e. + * idle = (1/W - 1)*(-true_avgidle) + * or + * idle = (1 - W)*(-cl->avgidle); + */ + idle = (-avgidle) - ((-avgidle) >> cl->ewma_log); + + /* + * That is not all. + * To maintain the rate allocated to the class, + * we add to undertime virtual clock, + * necessary to complete transmitted packet. + * (len/phys_bandwidth has been already passed + * to the moment of cbq_update) + */ + + idle -= L2T(&q->link, len); + idle += L2T(cl, len); + + cl->undertime = now + idle; + } else { + /* Underlimit */ + + cl->undertime = PSCHED_PASTPERFECT; + if (avgidle > cl->maxidle) + cl->avgidle = cl->maxidle; + else + cl->avgidle = avgidle; + } + if ((s64)(now - cl->last) > 0) + cl->last = now; + } + + cbq_update_toplevel(q, this, q->tx_borrowed); +} + +static inline struct cbq_class * +cbq_under_limit(struct cbq_class *cl) +{ + struct cbq_sched_data *q = qdisc_priv(cl->qdisc); + struct cbq_class *this_cl = cl; + + if (cl->tparent == NULL) + return cl; + + if (cl->undertime == PSCHED_PASTPERFECT || q->now >= cl->undertime) { + cl->delayed = 0; + return cl; + } + + do { + /* It is very suspicious place. Now overlimit + * action is generated for not bounded classes + * only if link is completely congested. + * Though it is in agree with ancestor-only paradigm, + * it looks very stupid. Particularly, + * it means that this chunk of code will either + * never be called or result in strong amplification + * of burstiness. Dangerous, silly, and, however, + * no another solution exists. + */ + cl = cl->borrow; + if (!cl) { + this_cl->qstats.overlimits++; + cbq_overlimit(this_cl); + return NULL; + } + if (cl->level > q->toplevel) + return NULL; + } while (cl->undertime != PSCHED_PASTPERFECT && q->now < cl->undertime); + + cl->delayed = 0; + return cl; +} + +static inline struct sk_buff * +cbq_dequeue_prio(struct Qdisc *sch, int prio) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl_tail, *cl_prev, *cl; + struct sk_buff *skb; + int deficit; + + cl_tail = cl_prev = q->active[prio]; + cl = cl_prev->next_alive; + + do { + deficit = 0; + + /* Start round */ + do { + struct cbq_class *borrow = cl; + + if (cl->q->q.qlen && + (borrow = cbq_under_limit(cl)) == NULL) + goto skip_class; + + if (cl->deficit <= 0) { + /* Class exhausted its allotment per + * this round. Switch to the next one. + */ + deficit = 1; + cl->deficit += cl->quantum; + goto next_class; + } + + skb = cl->q->dequeue(cl->q); + + /* Class did not give us any skb :-( + * It could occur even if cl->q->q.qlen != 0 + * f.e. if cl->q == "tbf" + */ + if (skb == NULL) + goto skip_class; + + cl->deficit -= qdisc_pkt_len(skb); + q->tx_class = cl; + q->tx_borrowed = borrow; + if (borrow != cl) { +#ifndef CBQ_XSTATS_BORROWS_BYTES + borrow->xstats.borrows++; + cl->xstats.borrows++; +#else + borrow->xstats.borrows += qdisc_pkt_len(skb); + cl->xstats.borrows += qdisc_pkt_len(skb); +#endif + } + q->tx_len = qdisc_pkt_len(skb); + + if (cl->deficit <= 0) { + q->active[prio] = cl; + cl = cl->next_alive; + cl->deficit += cl->quantum; + } + return skb; + +skip_class: + if (cl->q->q.qlen == 0 || prio != cl->cpriority) { + /* Class is empty or penalized. + * Unlink it from active chain. + */ + cl_prev->next_alive = cl->next_alive; + cl->next_alive = NULL; + + /* Did cl_tail point to it? */ + if (cl == cl_tail) { + /* Repair it! */ + cl_tail = cl_prev; + + /* Was it the last class in this band? */ + if (cl == cl_tail) { + /* Kill the band! */ + q->active[prio] = NULL; + q->activemask &= ~(1<<prio); + if (cl->q->q.qlen) + cbq_activate_class(cl); + return NULL; + } + + q->active[prio] = cl_tail; + } + if (cl->q->q.qlen) + cbq_activate_class(cl); + + cl = cl_prev; + } + +next_class: + cl_prev = cl; + cl = cl->next_alive; + } while (cl_prev != cl_tail); + } while (deficit); + + q->active[prio] = cl_prev; + + return NULL; +} + +static inline struct sk_buff * +cbq_dequeue_1(struct Qdisc *sch) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct sk_buff *skb; + unsigned int activemask; + + activemask = q->activemask & 0xFF; + while (activemask) { + int prio = ffz(~activemask); + activemask &= ~(1<<prio); + skb = cbq_dequeue_prio(sch, prio); + if (skb) + return skb; + } + return NULL; +} + +static struct sk_buff * +cbq_dequeue(struct Qdisc *sch) +{ + struct sk_buff *skb; + struct cbq_sched_data *q = qdisc_priv(sch); + psched_time_t now; + + now = psched_get_time(); + + if (q->tx_class) + cbq_update(q); + + q->now = now; + + for (;;) { + q->wd_expires = 0; + + skb = cbq_dequeue_1(sch); + if (skb) { + qdisc_bstats_update(sch, skb); + sch->q.qlen--; + return skb; + } + + /* All the classes are overlimit. + * + * It is possible, if: + * + * 1. Scheduler is empty. + * 2. Toplevel cutoff inhibited borrowing. + * 3. Root class is overlimit. + * + * Reset 2d and 3d conditions and retry. + * + * Note, that NS and cbq-2.0 are buggy, peeking + * an arbitrary class is appropriate for ancestor-only + * sharing, but not for toplevel algorithm. + * + * Our version is better, but slower, because it requires + * two passes, but it is unavoidable with top-level sharing. + */ + + if (q->toplevel == TC_CBQ_MAXLEVEL && + q->link.undertime == PSCHED_PASTPERFECT) + break; + + q->toplevel = TC_CBQ_MAXLEVEL; + q->link.undertime = PSCHED_PASTPERFECT; + } + + /* No packets in scheduler or nobody wants to give them to us :-( + * Sigh... start watchdog timer in the last case. + */ + + if (sch->q.qlen) { + qdisc_qstats_overlimit(sch); + if (q->wd_expires) + qdisc_watchdog_schedule(&q->watchdog, + now + q->wd_expires); + } + return NULL; +} + +/* CBQ class maintenance routines */ + +static void cbq_adjust_levels(struct cbq_class *this) +{ + if (this == NULL) + return; + + do { + int level = 0; + struct cbq_class *cl; + + cl = this->children; + if (cl) { + do { + if (cl->level > level) + level = cl->level; + } while ((cl = cl->sibling) != this->children); + } + this->level = level + 1; + } while ((this = this->tparent) != NULL); +} + +static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio) +{ + struct cbq_class *cl; + unsigned int h; + + if (q->quanta[prio] == 0) + return; + + for (h = 0; h < q->clhash.hashsize; h++) { + hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) { + /* BUGGGG... Beware! This expression suffer of + * arithmetic overflows! + */ + if (cl->priority == prio) { + cl->quantum = (cl->weight*cl->allot*q->nclasses[prio])/ + q->quanta[prio]; + } + if (cl->quantum <= 0 || + cl->quantum > 32*qdisc_dev(cl->qdisc)->mtu) { + pr_warn("CBQ: class %08x has bad quantum==%ld, repaired.\n", + cl->common.classid, cl->quantum); + cl->quantum = qdisc_dev(cl->qdisc)->mtu/2 + 1; + } + } + } +} + +static void cbq_sync_defmap(struct cbq_class *cl) +{ + struct cbq_sched_data *q = qdisc_priv(cl->qdisc); + struct cbq_class *split = cl->split; + unsigned int h; + int i; + + if (split == NULL) + return; + + for (i = 0; i <= TC_PRIO_MAX; i++) { + if (split->defaults[i] == cl && !(cl->defmap & (1<<i))) + split->defaults[i] = NULL; + } + + for (i = 0; i <= TC_PRIO_MAX; i++) { + int level = split->level; + + if (split->defaults[i]) + continue; + + for (h = 0; h < q->clhash.hashsize; h++) { + struct cbq_class *c; + + hlist_for_each_entry(c, &q->clhash.hash[h], + common.hnode) { + if (c->split == split && c->level < level && + c->defmap & (1<<i)) { + split->defaults[i] = c; + level = c->level; + } + } + } + } +} + +static void cbq_change_defmap(struct cbq_class *cl, u32 splitid, u32 def, u32 mask) +{ + struct cbq_class *split = NULL; + + if (splitid == 0) { + split = cl->split; + if (!split) + return; + splitid = split->common.classid; + } + + if (split == NULL || split->common.classid != splitid) { + for (split = cl->tparent; split; split = split->tparent) + if (split->common.classid == splitid) + break; + } + + if (split == NULL) + return; + + if (cl->split != split) { + cl->defmap = 0; + cbq_sync_defmap(cl); + cl->split = split; + cl->defmap = def & mask; + } else + cl->defmap = (cl->defmap & ~mask) | (def & mask); + + cbq_sync_defmap(cl); +} + +static void cbq_unlink_class(struct cbq_class *this) +{ + struct cbq_class *cl, **clp; + struct cbq_sched_data *q = qdisc_priv(this->qdisc); + + qdisc_class_hash_remove(&q->clhash, &this->common); + + if (this->tparent) { + clp = &this->sibling; + cl = *clp; + do { + if (cl == this) { + *clp = cl->sibling; + break; + } + clp = &cl->sibling; + } while ((cl = *clp) != this->sibling); + + if (this->tparent->children == this) { + this->tparent->children = this->sibling; + if (this->sibling == this) + this->tparent->children = NULL; + } + } else { + WARN_ON(this->sibling != this); + } +} + +static void cbq_link_class(struct cbq_class *this) +{ + struct cbq_sched_data *q = qdisc_priv(this->qdisc); + struct cbq_class *parent = this->tparent; + + this->sibling = this; + qdisc_class_hash_insert(&q->clhash, &this->common); + + if (parent == NULL) + return; + + if (parent->children == NULL) { + parent->children = this; + } else { + this->sibling = parent->children->sibling; + parent->children->sibling = this; + } +} + +static void +cbq_reset(struct Qdisc *sch) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl; + int prio; + unsigned int h; + + q->activemask = 0; + q->pmask = 0; + q->tx_class = NULL; + q->tx_borrowed = NULL; + qdisc_watchdog_cancel(&q->watchdog); + q->toplevel = TC_CBQ_MAXLEVEL; + q->now = psched_get_time(); + + for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++) + q->active[prio] = NULL; + + for (h = 0; h < q->clhash.hashsize; h++) { + hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) { + qdisc_reset(cl->q); + + cl->next_alive = NULL; + cl->undertime = PSCHED_PASTPERFECT; + cl->avgidle = cl->maxidle; + cl->deficit = cl->quantum; + cl->cpriority = cl->priority; + } + } +} + + +static void cbq_set_lss(struct cbq_class *cl, struct tc_cbq_lssopt *lss) +{ + if (lss->change & TCF_CBQ_LSS_FLAGS) { + cl->share = (lss->flags & TCF_CBQ_LSS_ISOLATED) ? NULL : cl->tparent; + cl->borrow = (lss->flags & TCF_CBQ_LSS_BOUNDED) ? NULL : cl->tparent; + } + if (lss->change & TCF_CBQ_LSS_EWMA) + cl->ewma_log = lss->ewma_log; + if (lss->change & TCF_CBQ_LSS_AVPKT) + cl->avpkt = lss->avpkt; + if (lss->change & TCF_CBQ_LSS_MINIDLE) + cl->minidle = -(long)lss->minidle; + if (lss->change & TCF_CBQ_LSS_MAXIDLE) { + cl->maxidle = lss->maxidle; + cl->avgidle = lss->maxidle; + } + if (lss->change & TCF_CBQ_LSS_OFFTIME) + cl->offtime = lss->offtime; +} + +static void cbq_rmprio(struct cbq_sched_data *q, struct cbq_class *cl) +{ + q->nclasses[cl->priority]--; + q->quanta[cl->priority] -= cl->weight; + cbq_normalize_quanta(q, cl->priority); +} + +static void cbq_addprio(struct cbq_sched_data *q, struct cbq_class *cl) +{ + q->nclasses[cl->priority]++; + q->quanta[cl->priority] += cl->weight; + cbq_normalize_quanta(q, cl->priority); +} + +static int cbq_set_wrr(struct cbq_class *cl, struct tc_cbq_wrropt *wrr) +{ + struct cbq_sched_data *q = qdisc_priv(cl->qdisc); + + if (wrr->allot) + cl->allot = wrr->allot; + if (wrr->weight) + cl->weight = wrr->weight; + if (wrr->priority) { + cl->priority = wrr->priority - 1; + cl->cpriority = cl->priority; + if (cl->priority >= cl->priority2) + cl->priority2 = TC_CBQ_MAXPRIO - 1; + } + + cbq_addprio(q, cl); + return 0; +} + +static int cbq_set_fopt(struct cbq_class *cl, struct tc_cbq_fopt *fopt) +{ + cbq_change_defmap(cl, fopt->split, fopt->defmap, fopt->defchange); + return 0; +} + +static const struct nla_policy cbq_policy[TCA_CBQ_MAX + 1] = { + [TCA_CBQ_LSSOPT] = { .len = sizeof(struct tc_cbq_lssopt) }, + [TCA_CBQ_WRROPT] = { .len = sizeof(struct tc_cbq_wrropt) }, + [TCA_CBQ_FOPT] = { .len = sizeof(struct tc_cbq_fopt) }, + [TCA_CBQ_OVL_STRATEGY] = { .len = sizeof(struct tc_cbq_ovl) }, + [TCA_CBQ_RATE] = { .len = sizeof(struct tc_ratespec) }, + [TCA_CBQ_RTAB] = { .type = NLA_BINARY, .len = TC_RTAB_SIZE }, + [TCA_CBQ_POLICE] = { .len = sizeof(struct tc_cbq_police) }, +}; + +static int cbq_opt_parse(struct nlattr *tb[TCA_CBQ_MAX + 1], + struct nlattr *opt, + struct netlink_ext_ack *extack) +{ + int err; + + if (!opt) { + NL_SET_ERR_MSG(extack, "CBQ options are required for this operation"); + return -EINVAL; + } + + err = nla_parse_nested_deprecated(tb, TCA_CBQ_MAX, opt, + cbq_policy, extack); + if (err < 0) + return err; + + if (tb[TCA_CBQ_WRROPT]) { + const struct tc_cbq_wrropt *wrr = nla_data(tb[TCA_CBQ_WRROPT]); + + if (wrr->priority > TC_CBQ_MAXPRIO) { + NL_SET_ERR_MSG(extack, "priority is bigger than TC_CBQ_MAXPRIO"); + err = -EINVAL; + } + } + return err; +} + +static int cbq_init(struct Qdisc *sch, struct nlattr *opt, + struct netlink_ext_ack *extack) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct nlattr *tb[TCA_CBQ_MAX + 1]; + struct tc_ratespec *r; + int err; + + qdisc_watchdog_init(&q->watchdog, sch); + + err = cbq_opt_parse(tb, opt, extack); + if (err < 0) + return err; + + if (!tb[TCA_CBQ_RTAB] || !tb[TCA_CBQ_RATE]) { + NL_SET_ERR_MSG(extack, "Rate specification missing or incomplete"); + return -EINVAL; + } + + r = nla_data(tb[TCA_CBQ_RATE]); + + q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB], extack); + if (!q->link.R_tab) + return -EINVAL; + + err = tcf_block_get(&q->link.block, &q->link.filter_list, sch, extack); + if (err) + goto put_rtab; + + err = qdisc_class_hash_init(&q->clhash); + if (err < 0) + goto put_block; + + q->link.sibling = &q->link; + q->link.common.classid = sch->handle; + q->link.qdisc = sch; + q->link.q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, + sch->handle, NULL); + if (!q->link.q) + q->link.q = &noop_qdisc; + else + qdisc_hash_add(q->link.q, true); + + q->link.priority = TC_CBQ_MAXPRIO - 1; + q->link.priority2 = TC_CBQ_MAXPRIO - 1; + q->link.cpriority = TC_CBQ_MAXPRIO - 1; + q->link.allot = psched_mtu(qdisc_dev(sch)); + q->link.quantum = q->link.allot; + q->link.weight = q->link.R_tab->rate.rate; + + q->link.ewma_log = TC_CBQ_DEF_EWMA; + q->link.avpkt = q->link.allot/2; + q->link.minidle = -0x7FFFFFFF; + + q->toplevel = TC_CBQ_MAXLEVEL; + q->now = psched_get_time(); + + cbq_link_class(&q->link); + + if (tb[TCA_CBQ_LSSOPT]) + cbq_set_lss(&q->link, nla_data(tb[TCA_CBQ_LSSOPT])); + + cbq_addprio(q, &q->link); + return 0; + +put_block: + tcf_block_put(q->link.block); + +put_rtab: + qdisc_put_rtab(q->link.R_tab); + return err; +} + +static int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl) +{ + unsigned char *b = skb_tail_pointer(skb); + + if (nla_put(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate)) + goto nla_put_failure; + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static int cbq_dump_lss(struct sk_buff *skb, struct cbq_class *cl) +{ + unsigned char *b = skb_tail_pointer(skb); + struct tc_cbq_lssopt opt; + + opt.flags = 0; + if (cl->borrow == NULL) + opt.flags |= TCF_CBQ_LSS_BOUNDED; + if (cl->share == NULL) + opt.flags |= TCF_CBQ_LSS_ISOLATED; + opt.ewma_log = cl->ewma_log; + opt.level = cl->level; + opt.avpkt = cl->avpkt; + opt.maxidle = cl->maxidle; + opt.minidle = (u32)(-cl->minidle); + opt.offtime = cl->offtime; + opt.change = ~0; + if (nla_put(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt)) + goto nla_put_failure; + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl) +{ + unsigned char *b = skb_tail_pointer(skb); + struct tc_cbq_wrropt opt; + + memset(&opt, 0, sizeof(opt)); + opt.flags = 0; + opt.allot = cl->allot; + opt.priority = cl->priority + 1; + opt.cpriority = cl->cpriority + 1; + opt.weight = cl->weight; + if (nla_put(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt)) + goto nla_put_failure; + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static int cbq_dump_fopt(struct sk_buff *skb, struct cbq_class *cl) +{ + unsigned char *b = skb_tail_pointer(skb); + struct tc_cbq_fopt opt; + + if (cl->split || cl->defmap) { + opt.split = cl->split ? cl->split->common.classid : 0; + opt.defmap = cl->defmap; + opt.defchange = ~0; + if (nla_put(skb, TCA_CBQ_FOPT, sizeof(opt), &opt)) + goto nla_put_failure; + } + return skb->len; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static int cbq_dump_attr(struct sk_buff *skb, struct cbq_class *cl) +{ + if (cbq_dump_lss(skb, cl) < 0 || + cbq_dump_rate(skb, cl) < 0 || + cbq_dump_wrr(skb, cl) < 0 || + cbq_dump_fopt(skb, cl) < 0) + return -1; + return 0; +} + +static int cbq_dump(struct Qdisc *sch, struct sk_buff *skb) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct nlattr *nest; + + nest = nla_nest_start_noflag(skb, TCA_OPTIONS); + if (nest == NULL) + goto nla_put_failure; + if (cbq_dump_attr(skb, &q->link) < 0) + goto nla_put_failure; + return nla_nest_end(skb, nest); + +nla_put_failure: + nla_nest_cancel(skb, nest); + return -1; +} + +static int +cbq_dump_stats(struct Qdisc *sch, struct gnet_dump *d) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + + q->link.xstats.avgidle = q->link.avgidle; + return gnet_stats_copy_app(d, &q->link.xstats, sizeof(q->link.xstats)); +} + +static int +cbq_dump_class(struct Qdisc *sch, unsigned long arg, + struct sk_buff *skb, struct tcmsg *tcm) +{ + struct cbq_class *cl = (struct cbq_class *)arg; + struct nlattr *nest; + + if (cl->tparent) + tcm->tcm_parent = cl->tparent->common.classid; + else + tcm->tcm_parent = TC_H_ROOT; + tcm->tcm_handle = cl->common.classid; + tcm->tcm_info = cl->q->handle; + + nest = nla_nest_start_noflag(skb, TCA_OPTIONS); + if (nest == NULL) + goto nla_put_failure; + if (cbq_dump_attr(skb, cl) < 0) + goto nla_put_failure; + return nla_nest_end(skb, nest); + +nla_put_failure: + nla_nest_cancel(skb, nest); + return -1; +} + +static int +cbq_dump_class_stats(struct Qdisc *sch, unsigned long arg, + struct gnet_dump *d) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl = (struct cbq_class *)arg; + __u32 qlen; + + cl->xstats.avgidle = cl->avgidle; + cl->xstats.undertime = 0; + qdisc_qstats_qlen_backlog(cl->q, &qlen, &cl->qstats.backlog); + + if (cl->undertime != PSCHED_PASTPERFECT) + cl->xstats.undertime = cl->undertime - q->now; + + if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 || + gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || + gnet_stats_copy_queue(d, NULL, &cl->qstats, qlen) < 0) + return -1; + + return gnet_stats_copy_app(d, &cl->xstats, sizeof(cl->xstats)); +} + +static int cbq_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, + struct Qdisc **old, struct netlink_ext_ack *extack) +{ + struct cbq_class *cl = (struct cbq_class *)arg; + + if (new == NULL) { + new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, + cl->common.classid, extack); + if (new == NULL) + return -ENOBUFS; + } + + *old = qdisc_replace(sch, new, &cl->q); + return 0; +} + +static struct Qdisc *cbq_leaf(struct Qdisc *sch, unsigned long arg) +{ + struct cbq_class *cl = (struct cbq_class *)arg; + + return cl->q; +} + +static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg) +{ + struct cbq_class *cl = (struct cbq_class *)arg; + + cbq_deactivate_class(cl); +} + +static unsigned long cbq_find(struct Qdisc *sch, u32 classid) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + + return (unsigned long)cbq_class_lookup(q, classid); +} + +static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + + WARN_ON(cl->filters); + + tcf_block_put(cl->block); + qdisc_put(cl->q); + qdisc_put_rtab(cl->R_tab); + gen_kill_estimator(&cl->rate_est); + if (cl != &q->link) + kfree(cl); +} + +static void cbq_destroy(struct Qdisc *sch) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct hlist_node *next; + struct cbq_class *cl; + unsigned int h; + +#ifdef CONFIG_NET_CLS_ACT + q->rx_class = NULL; +#endif + /* + * Filters must be destroyed first because we don't destroy the + * classes from root to leafs which means that filters can still + * be bound to classes which have been destroyed already. --TGR '04 + */ + for (h = 0; h < q->clhash.hashsize; h++) { + hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) { + tcf_block_put(cl->block); + cl->block = NULL; + } + } + for (h = 0; h < q->clhash.hashsize; h++) { + hlist_for_each_entry_safe(cl, next, &q->clhash.hash[h], + common.hnode) + cbq_destroy_class(sch, cl); + } + qdisc_class_hash_destroy(&q->clhash); +} + +static int +cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **tca, + unsigned long *arg, struct netlink_ext_ack *extack) +{ + int err; + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl = (struct cbq_class *)*arg; + struct nlattr *opt = tca[TCA_OPTIONS]; + struct nlattr *tb[TCA_CBQ_MAX + 1]; + struct cbq_class *parent; + struct qdisc_rate_table *rtab = NULL; + + err = cbq_opt_parse(tb, opt, extack); + if (err < 0) + return err; + + if (tb[TCA_CBQ_OVL_STRATEGY] || tb[TCA_CBQ_POLICE]) { + NL_SET_ERR_MSG(extack, "Neither overlimit strategy nor policing attributes can be used for changing class params"); + return -EOPNOTSUPP; + } + + if (cl) { + /* Check parent */ + if (parentid) { + if (cl->tparent && + cl->tparent->common.classid != parentid) { + NL_SET_ERR_MSG(extack, "Invalid parent id"); + return -EINVAL; + } + if (!cl->tparent && parentid != TC_H_ROOT) { + NL_SET_ERR_MSG(extack, "Parent must be root"); + return -EINVAL; + } + } + + if (tb[TCA_CBQ_RATE]) { + rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), + tb[TCA_CBQ_RTAB], extack); + if (rtab == NULL) + return -EINVAL; + } + + if (tca[TCA_RATE]) { + err = gen_replace_estimator(&cl->bstats, NULL, + &cl->rate_est, + NULL, + true, + tca[TCA_RATE]); + if (err) { + NL_SET_ERR_MSG(extack, "Failed to replace specified rate estimator"); + qdisc_put_rtab(rtab); + return err; + } + } + + /* Change class parameters */ + sch_tree_lock(sch); + + if (cl->next_alive != NULL) + cbq_deactivate_class(cl); + + if (rtab) { + qdisc_put_rtab(cl->R_tab); + cl->R_tab = rtab; + } + + if (tb[TCA_CBQ_LSSOPT]) + cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT])); + + if (tb[TCA_CBQ_WRROPT]) { + cbq_rmprio(q, cl); + cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT])); + } + + if (tb[TCA_CBQ_FOPT]) + cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT])); + + if (cl->q->q.qlen) + cbq_activate_class(cl); + + sch_tree_unlock(sch); + + return 0; + } + + if (parentid == TC_H_ROOT) + return -EINVAL; + + if (!tb[TCA_CBQ_WRROPT] || !tb[TCA_CBQ_RATE] || !tb[TCA_CBQ_LSSOPT]) { + NL_SET_ERR_MSG(extack, "One of the following attributes MUST be specified: WRR, rate or link sharing"); + return -EINVAL; + } + + rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB], + extack); + if (rtab == NULL) + return -EINVAL; + + if (classid) { + err = -EINVAL; + if (TC_H_MAJ(classid ^ sch->handle) || + cbq_class_lookup(q, classid)) { + NL_SET_ERR_MSG(extack, "Specified class not found"); + goto failure; + } + } else { + int i; + classid = TC_H_MAKE(sch->handle, 0x8000); + + for (i = 0; i < 0x8000; i++) { + if (++q->hgenerator >= 0x8000) + q->hgenerator = 1; + if (cbq_class_lookup(q, classid|q->hgenerator) == NULL) + break; + } + err = -ENOSR; + if (i >= 0x8000) { + NL_SET_ERR_MSG(extack, "Unable to generate classid"); + goto failure; + } + classid = classid|q->hgenerator; + } + + parent = &q->link; + if (parentid) { + parent = cbq_class_lookup(q, parentid); + err = -EINVAL; + if (!parent) { + NL_SET_ERR_MSG(extack, "Failed to find parentid"); + goto failure; + } + } + + err = -ENOBUFS; + cl = kzalloc(sizeof(*cl), GFP_KERNEL); + if (cl == NULL) + goto failure; + + gnet_stats_basic_sync_init(&cl->bstats); + err = tcf_block_get(&cl->block, &cl->filter_list, sch, extack); + if (err) { + kfree(cl); + goto failure; + } + + if (tca[TCA_RATE]) { + err = gen_new_estimator(&cl->bstats, NULL, &cl->rate_est, + NULL, true, tca[TCA_RATE]); + if (err) { + NL_SET_ERR_MSG(extack, "Couldn't create new estimator"); + tcf_block_put(cl->block); + kfree(cl); + goto failure; + } + } + + cl->R_tab = rtab; + rtab = NULL; + cl->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid, + NULL); + if (!cl->q) + cl->q = &noop_qdisc; + else + qdisc_hash_add(cl->q, true); + + cl->common.classid = classid; + cl->tparent = parent; + cl->qdisc = sch; + cl->allot = parent->allot; + cl->quantum = cl->allot; + cl->weight = cl->R_tab->rate.rate; + + sch_tree_lock(sch); + cbq_link_class(cl); + cl->borrow = cl->tparent; + if (cl->tparent != &q->link) + cl->share = cl->tparent; + cbq_adjust_levels(parent); + cl->minidle = -0x7FFFFFFF; + cbq_set_lss(cl, nla_data(tb[TCA_CBQ_LSSOPT])); + cbq_set_wrr(cl, nla_data(tb[TCA_CBQ_WRROPT])); + if (cl->ewma_log == 0) + cl->ewma_log = q->link.ewma_log; + if (cl->maxidle == 0) + cl->maxidle = q->link.maxidle; + if (cl->avpkt == 0) + cl->avpkt = q->link.avpkt; + if (tb[TCA_CBQ_FOPT]) + cbq_set_fopt(cl, nla_data(tb[TCA_CBQ_FOPT])); + sch_tree_unlock(sch); + + qdisc_class_hash_grow(sch, &q->clhash); + + *arg = (unsigned long)cl; + return 0; + +failure: + qdisc_put_rtab(rtab); + return err; +} + +static int cbq_delete(struct Qdisc *sch, unsigned long arg, + struct netlink_ext_ack *extack) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl = (struct cbq_class *)arg; + + if (cl->filters || cl->children || cl == &q->link) + return -EBUSY; + + sch_tree_lock(sch); + + qdisc_purge_queue(cl->q); + + if (cl->next_alive) + cbq_deactivate_class(cl); + + if (q->tx_borrowed == cl) + q->tx_borrowed = q->tx_class; + if (q->tx_class == cl) { + q->tx_class = NULL; + q->tx_borrowed = NULL; + } +#ifdef CONFIG_NET_CLS_ACT + if (q->rx_class == cl) + q->rx_class = NULL; +#endif + + cbq_unlink_class(cl); + cbq_adjust_levels(cl->tparent); + cl->defmap = 0; + cbq_sync_defmap(cl); + + cbq_rmprio(q, cl); + sch_tree_unlock(sch); + + cbq_destroy_class(sch, cl); + return 0; +} + +static struct tcf_block *cbq_tcf_block(struct Qdisc *sch, unsigned long arg, + struct netlink_ext_ack *extack) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl = (struct cbq_class *)arg; + + if (cl == NULL) + cl = &q->link; + + return cl->block; +} + +static unsigned long cbq_bind_filter(struct Qdisc *sch, unsigned long parent, + u32 classid) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *p = (struct cbq_class *)parent; + struct cbq_class *cl = cbq_class_lookup(q, classid); + + if (cl) { + if (p && p->level <= cl->level) + return 0; + cl->filters++; + return (unsigned long)cl; + } + return 0; +} + +static void cbq_unbind_filter(struct Qdisc *sch, unsigned long arg) +{ + struct cbq_class *cl = (struct cbq_class *)arg; + + cl->filters--; +} + +static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg) +{ + struct cbq_sched_data *q = qdisc_priv(sch); + struct cbq_class *cl; + unsigned int h; + + if (arg->stop) + return; + + for (h = 0; h < q->clhash.hashsize; h++) { + hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) { + if (!tc_qdisc_stats_dump(sch, (unsigned long)cl, arg)) + return; + } + } +} + +static const struct Qdisc_class_ops cbq_class_ops = { + .graft = cbq_graft, + .leaf = cbq_leaf, + .qlen_notify = cbq_qlen_notify, + .find = cbq_find, + .change = cbq_change_class, + .delete = cbq_delete, + .walk = cbq_walk, + .tcf_block = cbq_tcf_block, + .bind_tcf = cbq_bind_filter, + .unbind_tcf = cbq_unbind_filter, + .dump = cbq_dump_class, + .dump_stats = cbq_dump_class_stats, +}; + +static struct Qdisc_ops cbq_qdisc_ops __read_mostly = { + .next = NULL, + .cl_ops = &cbq_class_ops, + .id = "cbq", + .priv_size = sizeof(struct cbq_sched_data), + .enqueue = cbq_enqueue, + .dequeue = cbq_dequeue, + .peek = qdisc_peek_dequeued, + .init = cbq_init, + .reset = cbq_reset, + .destroy = cbq_destroy, + .change = NULL, + .dump = cbq_dump, + .dump_stats = cbq_dump_stats, + .owner = THIS_MODULE, +}; + +static int __init cbq_module_init(void) +{ + return register_qdisc(&cbq_qdisc_ops); +} +static void __exit cbq_module_exit(void) +{ + unregister_qdisc(&cbq_qdisc_ops); +} +module_init(cbq_module_init) +module_exit(cbq_module_exit) +MODULE_LICENSE("GPL"); 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