| /* |
| * net/sched/sch_cbq.c Class-Based Queueing discipline. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| * |
| */ |
| |
| #include <linux/module.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> |
| |
| |
| /* 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 cbq_class *next; /* hash table link */ |
| struct cbq_class *next_alive; /* next class with backlog in this priority band */ |
| |
| /* Parameters */ |
| u32 classid; |
| unsigned char priority; /* class priority */ |
| unsigned char priority2; /* priority to be used after overlimit */ |
| unsigned char ewma_log; /* time constant for idle time calculation */ |
| unsigned char ovl_strategy; |
| #ifdef CONFIG_NET_CLS_POLICE |
| unsigned char police; |
| #endif |
| |
| u32 defmap; |
| |
| /* Link-sharing scheduler parameters */ |
| long maxidle; /* Class parameters: see below. */ |
| long offtime; |
| long minidle; |
| u32 avpkt; |
| struct qdisc_rate_table *R_tab; |
| |
| /* Overlimit strategy parameters */ |
| void (*overlimit)(struct cbq_class *cl); |
| psched_tdiff_t penalty; |
| |
| /* 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 bstats; |
| struct gnet_stats_queue qstats; |
| struct gnet_stats_rate_est rate_est; |
| struct tc_cbq_xstats xstats; |
| |
| struct tcf_proto *filter_list; |
| |
| int refcnt; |
| int filters; |
| |
| struct cbq_class *defaults[TC_PRIO_MAX+1]; |
| }; |
| |
| struct cbq_sched_data |
| { |
| struct cbq_class *classes[16]; /* Hash table of all classes */ |
| int nclasses[TC_CBQ_MAXPRIO+1]; |
| unsigned quanta[TC_CBQ_MAXPRIO+1]; |
| |
| struct cbq_class link; |
| |
| unsigned activemask; |
| struct cbq_class *active[TC_CBQ_MAXPRIO+1]; /* List of all classes |
| with backlog */ |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| 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 */ |
| psched_time_t now_rt; /* Cached real time */ |
| unsigned pmask; |
| |
| struct hrtimer delay_timer; |
| 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) ((cl)->R_tab->data[(len)>>(cl)->R_tab->rate.cell_log]) |
| |
| |
| static __inline__ unsigned cbq_hash(u32 h) |
| { |
| h ^= h>>8; |
| h ^= h>>4; |
| return h&0xF; |
| } |
| |
| static __inline__ struct cbq_class * |
| cbq_class_lookup(struct cbq_sched_data *q, u32 classid) |
| { |
| struct cbq_class *cl; |
| |
| for (cl = q->classes[cbq_hash(classid)]; cl; cl = cl->next) |
| if (cl->classid == classid) |
| return cl; |
| return NULL; |
| } |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| |
| static struct cbq_class * |
| cbq_reclassify(struct sk_buff *skb, struct cbq_class *this) |
| { |
| struct cbq_class *cl, *new; |
| |
| for (cl = this->tparent; cl; cl = cl->tparent) |
| if ((new = cl->defaults[TC_PRIO_BESTEFFORT]) != 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_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_BYPASS; |
| for (;;) { |
| int result = 0; |
| defmap = head->defaults; |
| |
| /* |
| * Step 2+n. Apply classifier. |
| */ |
| if (!head->filter_list || (result = tc_classify(skb, head->filter_list, &res)) < 0) |
| goto fallback; |
| |
| if ((cl = (void*)res.class) == NULL) { |
| 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 || cl->level >= head->level) |
| goto fallback; |
| } |
| |
| #ifdef CONFIG_NET_CLS_ACT |
| switch (result) { |
| case TC_ACT_QUEUED: |
| case TC_ACT_STOLEN: |
| *qerr = NET_XMIT_SUCCESS; |
| case TC_ACT_SHOT: |
| return NULL; |
| } |
| #elif defined(CONFIG_NET_CLS_POLICE) |
| switch (result) { |
| case TC_POLICE_RECLASSIFY: |
| return cbq_reclassify(skb, cl); |
| case TC_POLICE_SHOT: |
| return NULL; |
| default: |
| break; |
| } |
| #endif |
| if (cl->level == 0) |
| return cl; |
| |
| /* |
| * Step 3+n. If classifier selected a link sharing class, |
| * apply agency specific classifier. |
| * Repeat this procdure 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 && !(cl->q->flags&TCQ_F_THROTTLED)) { |
| psched_time_t now; |
| psched_tdiff_t incr; |
| |
| now = psched_get_time(); |
| incr = now - q->now_rt; |
| now = q->now + incr; |
| |
| 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 cbq_sched_data *q = qdisc_priv(sch); |
| int len = skb->len; |
| int ret; |
| struct cbq_class *cl = cbq_classify(skb, sch, &ret); |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| q->rx_class = cl; |
| #endif |
| if (cl == NULL) { |
| if (ret == NET_XMIT_BYPASS) |
| sch->qstats.drops++; |
| kfree_skb(skb); |
| return ret; |
| } |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| cl->q->__parent = sch; |
| #endif |
| if ((ret = cl->q->enqueue(skb, cl->q)) == NET_XMIT_SUCCESS) { |
| sch->q.qlen++; |
| sch->bstats.packets++; |
| sch->bstats.bytes+=len; |
| cbq_mark_toplevel(q, cl); |
| if (!cl->next_alive) |
| cbq_activate_class(cl); |
| return ret; |
| } |
| |
| sch->qstats.drops++; |
| cbq_mark_toplevel(q, cl); |
| cl->qstats.drops++; |
| return ret; |
| } |
| |
| static int |
| cbq_requeue(struct sk_buff *skb, struct Qdisc *sch) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl; |
| int ret; |
| |
| if ((cl = q->tx_class) == NULL) { |
| kfree_skb(skb); |
| sch->qstats.drops++; |
| return NET_XMIT_CN; |
| } |
| q->tx_class = NULL; |
| |
| cbq_mark_toplevel(q, cl); |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| q->rx_class = cl; |
| cl->q->__parent = sch; |
| #endif |
| if ((ret = cl->q->ops->requeue(skb, cl->q)) == 0) { |
| sch->q.qlen++; |
| sch->qstats.requeues++; |
| if (!cl->next_alive) |
| cbq_activate_class(cl); |
| return 0; |
| } |
| sch->qstats.drops++; |
| cl->qstats.drops++; |
| return ret; |
| } |
| |
| /* Overlimit actions */ |
| |
| /* TC_CBQ_OVL_CLASSIC: (default) penalize leaf class by adding offtime */ |
| |
| static void cbq_ovl_classic(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; |
| } |
| } |
| |
| /* TC_CBQ_OVL_RCLASSIC: penalize by offtime classes in hierarchy, when |
| they go overlimit |
| */ |
| |
| static void cbq_ovl_rclassic(struct cbq_class *cl) |
| { |
| struct cbq_sched_data *q = qdisc_priv(cl->qdisc); |
| struct cbq_class *this = cl; |
| |
| do { |
| if (cl->level > q->toplevel) { |
| cl = NULL; |
| break; |
| } |
| } while ((cl = cl->borrow) != NULL); |
| |
| if (cl == NULL) |
| cl = this; |
| cbq_ovl_classic(cl); |
| } |
| |
| /* TC_CBQ_OVL_DELAY: delay until it will go to underlimit */ |
| |
| static void cbq_ovl_delay(struct cbq_class *cl) |
| { |
| struct cbq_sched_data *q = qdisc_priv(cl->qdisc); |
| psched_tdiff_t delay = cl->undertime - q->now; |
| |
| if (!cl->delayed) { |
| psched_time_t sched = q->now; |
| ktime_t expires; |
| |
| delay += cl->offtime; |
| if (cl->avgidle < 0) |
| delay -= (-cl->avgidle) - ((-cl->avgidle) >> cl->ewma_log); |
| if (cl->avgidle < cl->minidle) |
| cl->avgidle = cl->minidle; |
| cl->undertime = q->now + delay; |
| |
| if (delay > 0) { |
| sched += delay + cl->penalty; |
| cl->penalized = sched; |
| cl->cpriority = TC_CBQ_MAXPRIO; |
| q->pmask |= (1<<TC_CBQ_MAXPRIO); |
| |
| expires = ktime_set(0, 0); |
| expires = ktime_add_ns(expires, PSCHED_US2NS(sched)); |
| if (hrtimer_try_to_cancel(&q->delay_timer) && |
| ktime_to_ns(ktime_sub(q->delay_timer.expires, |
| expires)) > 0) |
| q->delay_timer.expires = expires; |
| hrtimer_restart(&q->delay_timer); |
| cl->delayed = 1; |
| cl->xstats.overactions++; |
| return; |
| } |
| delay = 1; |
| } |
| if (q->wd_expires == 0 || q->wd_expires > delay) |
| q->wd_expires = delay; |
| } |
| |
| /* TC_CBQ_OVL_LOWPRIO: penalize class by lowering its priority band */ |
| |
| static void cbq_ovl_lowprio(struct cbq_class *cl) |
| { |
| struct cbq_sched_data *q = qdisc_priv(cl->qdisc); |
| |
| cl->penalized = q->now + cl->penalty; |
| |
| if (cl->cpriority != cl->priority2) { |
| cl->cpriority = cl->priority2; |
| q->pmask |= (1<<cl->cpriority); |
| cl->xstats.overactions++; |
| } |
| cbq_ovl_classic(cl); |
| } |
| |
| /* TC_CBQ_OVL_DROP: penalize class by dropping */ |
| |
| static void cbq_ovl_drop(struct cbq_class *cl) |
| { |
| if (cl->q->ops->drop) |
| if (cl->q->ops->drop(cl->q)) |
| cl->qdisc->q.qlen--; |
| cl->xstats.overactions++; |
| cbq_ovl_classic(cl); |
| } |
| |
| static psched_tdiff_t cbq_undelay_prio(struct cbq_sched_data *q, int prio, |
| psched_time_t now) |
| { |
| struct cbq_class *cl; |
| struct cbq_class *cl_prev = q->active[prio]; |
| psched_time_t sched = now; |
| |
| if (cl_prev == NULL) |
| return 0; |
| |
| do { |
| cl = cl_prev->next_alive; |
| if (now - cl->penalized > 0) { |
| cl_prev->next_alive = cl->next_alive; |
| cl->next_alive = NULL; |
| cl->cpriority = cl->priority; |
| cl->delayed = 0; |
| cbq_activate_class(cl); |
| |
| if (cl == q->active[prio]) { |
| q->active[prio] = cl_prev; |
| if (cl == q->active[prio]) { |
| q->active[prio] = NULL; |
| return 0; |
| } |
| } |
| |
| cl = cl_prev->next_alive; |
| } else if (sched - cl->penalized > 0) |
| sched = cl->penalized; |
| } while ((cl_prev = cl) != q->active[prio]); |
| |
| return sched - now; |
| } |
| |
| static enum hrtimer_restart cbq_undelay(struct hrtimer *timer) |
| { |
| struct cbq_sched_data *q = container_of(timer, struct cbq_sched_data, |
| delay_timer); |
| struct Qdisc *sch = q->watchdog.qdisc; |
| psched_time_t now; |
| psched_tdiff_t delay = 0; |
| unsigned pmask; |
| |
| now = psched_get_time(); |
| |
| pmask = q->pmask; |
| q->pmask = 0; |
| |
| while (pmask) { |
| int prio = ffz(~pmask); |
| psched_tdiff_t tmp; |
| |
| pmask &= ~(1<<prio); |
| |
| tmp = cbq_undelay_prio(q, prio, now); |
| if (tmp > 0) { |
| q->pmask |= 1<<prio; |
| if (tmp < delay || delay == 0) |
| delay = tmp; |
| } |
| } |
| |
| if (delay) { |
| ktime_t time; |
| |
| time = ktime_set(0, 0); |
| time = ktime_add_ns(time, PSCHED_US2NS(now + delay)); |
| hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS); |
| } |
| |
| sch->flags &= ~TCQ_F_THROTTLED; |
| netif_schedule(sch->dev); |
| return HRTIMER_NORESTART; |
| } |
| |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| |
| static int cbq_reshape_fail(struct sk_buff *skb, struct Qdisc *child) |
| { |
| int len = skb->len; |
| struct Qdisc *sch = child->__parent; |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl = q->rx_class; |
| |
| q->rx_class = NULL; |
| |
| if (cl && (cl = cbq_reclassify(skb, cl)) != NULL) { |
| |
| cbq_mark_toplevel(q, cl); |
| |
| q->rx_class = cl; |
| cl->q->__parent = sch; |
| |
| if (cl->q->enqueue(skb, cl->q) == 0) { |
| sch->q.qlen++; |
| sch->bstats.packets++; |
| sch->bstats.bytes+=len; |
| if (!cl->next_alive) |
| cbq_activate_class(cl); |
| return 0; |
| } |
| sch->qstats.drops++; |
| return 0; |
| } |
| |
| sch->qstats.drops++; |
| return -1; |
| } |
| #endif |
| |
| /* |
| 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; |
| |
| q->tx_class = NULL; |
| |
| for ( ; cl; cl = cl->share) { |
| long avgidle = cl->avgidle; |
| long idle; |
| |
| cl->bstats.packets++; |
| cl->bstats.bytes += len; |
| |
| /* |
| (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 = q->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 = q->now + idle; |
| } else { |
| /* Underlimit */ |
| |
| cl->undertime = PSCHED_PASTPERFECT; |
| if (avgidle > cl->maxidle) |
| cl->avgidle = cl->maxidle; |
| else |
| cl->avgidle = avgidle; |
| } |
| cl->last = q->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. |
| */ |
| if ((cl = cl->borrow) == NULL) { |
| this_cl->qstats.overlimits++; |
| this_cl->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 -= skb->len; |
| 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 += skb->len; |
| cl->xstats.borrows += skb->len; |
| #endif |
| } |
| q->tx_len = skb->len; |
| |
| 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 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; |
| psched_tdiff_t incr; |
| |
| now = psched_get_time(); |
| incr = now - q->now_rt; |
| |
| if (q->tx_class) { |
| psched_tdiff_t incr2; |
| /* Time integrator. We calculate EOS time |
| by adding expected packet transmission time. |
| If real time is greater, we warp artificial clock, |
| so that: |
| |
| cbq_time = max(real_time, work); |
| */ |
| incr2 = L2T(&q->link, q->tx_len); |
| q->now += incr2; |
| cbq_update(q); |
| if ((incr -= incr2) < 0) |
| incr = 0; |
| } |
| q->now += incr; |
| q->now_rt = now; |
| |
| for (;;) { |
| q->wd_expires = 0; |
| |
| skb = cbq_dequeue_1(sch); |
| if (skb) { |
| sch->q.qlen--; |
| sch->flags &= ~TCQ_F_THROTTLED; |
| 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) { |
| sch->qstats.overlimits++; |
| if (q->wd_expires) |
| qdisc_watchdog_schedule(&q->watchdog, |
| now + q->wd_expires); |
| } |
| return NULL; |
| } |
| |
| /* CBQ class maintanance routines */ |
| |
| static void cbq_adjust_levels(struct cbq_class *this) |
| { |
| if (this == NULL) |
| return; |
| |
| do { |
| int level = 0; |
| struct cbq_class *cl; |
| |
| if ((cl = this->children) != NULL) { |
| 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 h; |
| |
| if (q->quanta[prio] == 0) |
| return; |
| |
| for (h=0; h<16; h++) { |
| for (cl = q->classes[h]; cl; cl = cl->next) { |
| /* 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*cl->qdisc->dev->mtu) { |
| printk(KERN_WARNING "CBQ: class %08x has bad quantum==%ld, repaired.\n", cl->classid, cl->quantum); |
| cl->quantum = cl->qdisc->dev->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 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<16; h++) { |
| struct cbq_class *c; |
| |
| for (c = q->classes[h]; c; c = c->next) { |
| 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) { |
| if ((split = cl->split) == NULL) |
| return; |
| splitid = split->classid; |
| } |
| |
| if (split == NULL || split->classid != splitid) { |
| for (split = cl->tparent; split; split = split->tparent) |
| if (split->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); |
| |
| for (clp = &q->classes[cbq_hash(this->classid)]; (cl = *clp) != NULL; clp = &cl->next) { |
| if (cl == this) { |
| *clp = cl->next; |
| cl->next = NULL; |
| break; |
| } |
| } |
| |
| 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 { |
| BUG_TRAP(this->sibling == this); |
| } |
| } |
| |
| static void cbq_link_class(struct cbq_class *this) |
| { |
| struct cbq_sched_data *q = qdisc_priv(this->qdisc); |
| unsigned h = cbq_hash(this->classid); |
| struct cbq_class *parent = this->tparent; |
| |
| this->sibling = this; |
| this->next = q->classes[h]; |
| q->classes[h] = this; |
| |
| if (parent == NULL) |
| return; |
| |
| if (parent->children == NULL) { |
| parent->children = this; |
| } else { |
| this->sibling = parent->children->sibling; |
| parent->children->sibling = this; |
| } |
| } |
| |
| static unsigned int cbq_drop(struct Qdisc* sch) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl, *cl_head; |
| int prio; |
| unsigned int len; |
| |
| for (prio = TC_CBQ_MAXPRIO; prio >= 0; prio--) { |
| if ((cl_head = q->active[prio]) == NULL) |
| continue; |
| |
| cl = cl_head; |
| do { |
| if (cl->q->ops->drop && (len = cl->q->ops->drop(cl->q))) { |
| sch->q.qlen--; |
| if (!cl->q->q.qlen) |
| cbq_deactivate_class(cl); |
| return len; |
| } |
| } while ((cl = cl->next_alive) != cl_head); |
| } |
| return 0; |
| } |
| |
| static void |
| cbq_reset(struct Qdisc* sch) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl; |
| int prio; |
| unsigned h; |
| |
| q->activemask = 0; |
| q->pmask = 0; |
| q->tx_class = NULL; |
| q->tx_borrowed = NULL; |
| qdisc_watchdog_cancel(&q->watchdog); |
| hrtimer_cancel(&q->delay_timer); |
| q->toplevel = TC_CBQ_MAXLEVEL; |
| q->now = psched_get_time(); |
| q->now_rt = q->now; |
| |
| for (prio = 0; prio <= TC_CBQ_MAXPRIO; prio++) |
| q->active[prio] = NULL; |
| |
| for (h = 0; h < 16; h++) { |
| for (cl = q->classes[h]; cl; cl = cl->next) { |
| qdisc_reset(cl->q); |
| |
| cl->next_alive = NULL; |
| cl->undertime = PSCHED_PASTPERFECT; |
| cl->avgidle = cl->maxidle; |
| cl->deficit = cl->quantum; |
| cl->cpriority = cl->priority; |
| } |
| } |
| sch->q.qlen = 0; |
| } |
| |
| |
| static int 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; |
| return 0; |
| } |
| |
| 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_overlimit(struct cbq_class *cl, struct tc_cbq_ovl *ovl) |
| { |
| switch (ovl->strategy) { |
| case TC_CBQ_OVL_CLASSIC: |
| cl->overlimit = cbq_ovl_classic; |
| break; |
| case TC_CBQ_OVL_DELAY: |
| cl->overlimit = cbq_ovl_delay; |
| break; |
| case TC_CBQ_OVL_LOWPRIO: |
| if (ovl->priority2-1 >= TC_CBQ_MAXPRIO || |
| ovl->priority2-1 <= cl->priority) |
| return -EINVAL; |
| cl->priority2 = ovl->priority2-1; |
| cl->overlimit = cbq_ovl_lowprio; |
| break; |
| case TC_CBQ_OVL_DROP: |
| cl->overlimit = cbq_ovl_drop; |
| break; |
| case TC_CBQ_OVL_RCLASSIC: |
| cl->overlimit = cbq_ovl_rclassic; |
| break; |
| default: |
| return -EINVAL; |
| } |
| cl->penalty = ovl->penalty; |
| return 0; |
| } |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| static int cbq_set_police(struct cbq_class *cl, struct tc_cbq_police *p) |
| { |
| cl->police = p->police; |
| |
| if (cl->q->handle) { |
| if (p->police == TC_POLICE_RECLASSIFY) |
| cl->q->reshape_fail = cbq_reshape_fail; |
| else |
| cl->q->reshape_fail = NULL; |
| } |
| return 0; |
| } |
| #endif |
| |
| 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 int cbq_init(struct Qdisc *sch, struct rtattr *opt) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct rtattr *tb[TCA_CBQ_MAX]; |
| struct tc_ratespec *r; |
| |
| if (rtattr_parse_nested(tb, TCA_CBQ_MAX, opt) < 0 || |
| tb[TCA_CBQ_RTAB-1] == NULL || tb[TCA_CBQ_RATE-1] == NULL || |
| RTA_PAYLOAD(tb[TCA_CBQ_RATE-1]) < sizeof(struct tc_ratespec)) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_LSSOPT-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT-1]) < sizeof(struct tc_cbq_lssopt)) |
| return -EINVAL; |
| |
| r = RTA_DATA(tb[TCA_CBQ_RATE-1]); |
| |
| if ((q->link.R_tab = qdisc_get_rtab(r, tb[TCA_CBQ_RTAB-1])) == NULL) |
| return -EINVAL; |
| |
| q->link.refcnt = 1; |
| q->link.sibling = &q->link; |
| q->link.classid = sch->handle; |
| q->link.qdisc = sch; |
| if (!(q->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
| sch->handle))) |
| q->link.q = &noop_qdisc; |
| |
| q->link.priority = TC_CBQ_MAXPRIO-1; |
| q->link.priority2 = TC_CBQ_MAXPRIO-1; |
| q->link.cpriority = TC_CBQ_MAXPRIO-1; |
| q->link.ovl_strategy = TC_CBQ_OVL_CLASSIC; |
| q->link.overlimit = cbq_ovl_classic; |
| q->link.allot = psched_mtu(sch->dev); |
| 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; |
| |
| qdisc_watchdog_init(&q->watchdog, sch); |
| hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
| q->delay_timer.function = cbq_undelay; |
| q->toplevel = TC_CBQ_MAXLEVEL; |
| q->now = psched_get_time(); |
| q->now_rt = q->now; |
| |
| cbq_link_class(&q->link); |
| |
| if (tb[TCA_CBQ_LSSOPT-1]) |
| cbq_set_lss(&q->link, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); |
| |
| cbq_addprio(q, &q->link); |
| return 0; |
| } |
| |
| static __inline__ int cbq_dump_rate(struct sk_buff *skb, struct cbq_class *cl) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| |
| RTA_PUT(skb, TCA_CBQ_RATE, sizeof(cl->R_tab->rate), &cl->R_tab->rate); |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static __inline__ 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; |
| RTA_PUT(skb, TCA_CBQ_LSSOPT, sizeof(opt), &opt); |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static __inline__ int cbq_dump_wrr(struct sk_buff *skb, struct cbq_class *cl) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct tc_cbq_wrropt opt; |
| |
| opt.flags = 0; |
| opt.allot = cl->allot; |
| opt.priority = cl->priority+1; |
| opt.cpriority = cl->cpriority+1; |
| opt.weight = cl->weight; |
| RTA_PUT(skb, TCA_CBQ_WRROPT, sizeof(opt), &opt); |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static __inline__ int cbq_dump_ovl(struct sk_buff *skb, struct cbq_class *cl) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct tc_cbq_ovl opt; |
| |
| opt.strategy = cl->ovl_strategy; |
| opt.priority2 = cl->priority2+1; |
| opt.pad = 0; |
| opt.penalty = cl->penalty; |
| RTA_PUT(skb, TCA_CBQ_OVL_STRATEGY, sizeof(opt), &opt); |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static __inline__ 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->classid : 0; |
| opt.defmap = cl->defmap; |
| opt.defchange = ~0; |
| RTA_PUT(skb, TCA_CBQ_FOPT, sizeof(opt), &opt); |
| } |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| static __inline__ int cbq_dump_police(struct sk_buff *skb, struct cbq_class *cl) |
| { |
| unsigned char *b = skb_tail_pointer(skb); |
| struct tc_cbq_police opt; |
| |
| if (cl->police) { |
| opt.police = cl->police; |
| opt.__res1 = 0; |
| opt.__res2 = 0; |
| RTA_PUT(skb, TCA_CBQ_POLICE, sizeof(opt), &opt); |
| } |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| #endif |
| |
| 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_ovl(skb, cl) < 0 || |
| #ifdef CONFIG_NET_CLS_POLICE |
| cbq_dump_police(skb, cl) < 0 || |
| #endif |
| 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); |
| unsigned char *b = skb_tail_pointer(skb); |
| struct rtattr *rta; |
| |
| rta = (struct rtattr*)b; |
| RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
| if (cbq_dump_attr(skb, &q->link) < 0) |
| goto rtattr_failure; |
| rta->rta_len = skb_tail_pointer(skb) - b; |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| 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; |
| unsigned char *b = skb_tail_pointer(skb); |
| struct rtattr *rta; |
| |
| if (cl->tparent) |
| tcm->tcm_parent = cl->tparent->classid; |
| else |
| tcm->tcm_parent = TC_H_ROOT; |
| tcm->tcm_handle = cl->classid; |
| tcm->tcm_info = cl->q->handle; |
| |
| rta = (struct rtattr*)b; |
| RTA_PUT(skb, TCA_OPTIONS, 0, NULL); |
| if (cbq_dump_attr(skb, cl) < 0) |
| goto rtattr_failure; |
| rta->rta_len = skb_tail_pointer(skb) - b; |
| return skb->len; |
| |
| rtattr_failure: |
| nlmsg_trim(skb, b); |
| 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; |
| |
| cl->qstats.qlen = cl->q->q.qlen; |
| cl->xstats.avgidle = cl->avgidle; |
| cl->xstats.undertime = 0; |
| |
| if (cl->undertime != PSCHED_PASTPERFECT) |
| cl->xstats.undertime = cl->undertime - q->now; |
| |
| if (gnet_stats_copy_basic(d, &cl->bstats) < 0 || |
| gnet_stats_copy_rate_est(d, &cl->rate_est) < 0 || |
| gnet_stats_copy_queue(d, &cl->qstats) < 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 cbq_class *cl = (struct cbq_class*)arg; |
| |
| if (cl) { |
| if (new == NULL) { |
| if ((new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, |
| cl->classid)) == NULL) |
| return -ENOBUFS; |
| } else { |
| #ifdef CONFIG_NET_CLS_POLICE |
| if (cl->police == TC_POLICE_RECLASSIFY) |
| new->reshape_fail = cbq_reshape_fail; |
| #endif |
| } |
| sch_tree_lock(sch); |
| *old = xchg(&cl->q, new); |
| qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
| qdisc_reset(*old); |
| sch_tree_unlock(sch); |
| |
| return 0; |
| } |
| return -ENOENT; |
| } |
| |
| static struct Qdisc * |
| cbq_leaf(struct Qdisc *sch, unsigned long arg) |
| { |
| struct cbq_class *cl = (struct cbq_class*)arg; |
| |
| return cl ? cl->q : NULL; |
| } |
| |
| static void cbq_qlen_notify(struct Qdisc *sch, unsigned long arg) |
| { |
| struct cbq_class *cl = (struct cbq_class *)arg; |
| |
| if (cl->q->q.qlen == 0) |
| cbq_deactivate_class(cl); |
| } |
| |
| static unsigned long cbq_get(struct Qdisc *sch, u32 classid) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl = cbq_class_lookup(q, classid); |
| |
| if (cl) { |
| cl->refcnt++; |
| return (unsigned long)cl; |
| } |
| return 0; |
| } |
| |
| static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| |
| BUG_TRAP(!cl->filters); |
| |
| tcf_destroy_chain(cl->filter_list); |
| qdisc_destroy(cl->q); |
| qdisc_put_rtab(cl->R_tab); |
| gen_kill_estimator(&cl->bstats, &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 cbq_class *cl; |
| unsigned h; |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| 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 < 16; h++) { |
| for (cl = q->classes[h]; cl; cl = cl->next) { |
| tcf_destroy_chain(cl->filter_list); |
| cl->filter_list = NULL; |
| } |
| } |
| for (h = 0; h < 16; h++) { |
| struct cbq_class *next; |
| |
| for (cl = q->classes[h]; cl; cl = next) { |
| next = cl->next; |
| cbq_destroy_class(sch, cl); |
| } |
| } |
| } |
| |
| static void cbq_put(struct Qdisc *sch, unsigned long arg) |
| { |
| struct cbq_class *cl = (struct cbq_class*)arg; |
| |
| if (--cl->refcnt == 0) { |
| #ifdef CONFIG_NET_CLS_POLICE |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| |
| spin_lock_bh(&sch->dev->queue_lock); |
| if (q->rx_class == cl) |
| q->rx_class = NULL; |
| spin_unlock_bh(&sch->dev->queue_lock); |
| #endif |
| |
| cbq_destroy_class(sch, cl); |
| } |
| } |
| |
| static int |
| cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct rtattr **tca, |
| unsigned long *arg) |
| { |
| int err; |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl = (struct cbq_class*)*arg; |
| struct rtattr *opt = tca[TCA_OPTIONS-1]; |
| struct rtattr *tb[TCA_CBQ_MAX]; |
| struct cbq_class *parent; |
| struct qdisc_rate_table *rtab = NULL; |
| |
| if (opt==NULL || rtattr_parse_nested(tb, TCA_CBQ_MAX, opt)) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_OVL_STRATEGY-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY-1]) < sizeof(struct tc_cbq_ovl)) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_FOPT-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_FOPT-1]) < sizeof(struct tc_cbq_fopt)) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_RATE-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_RATE-1]) < sizeof(struct tc_ratespec)) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_LSSOPT-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT-1]) < sizeof(struct tc_cbq_lssopt)) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_WRROPT-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_WRROPT-1]) < sizeof(struct tc_cbq_wrropt)) |
| return -EINVAL; |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| if (tb[TCA_CBQ_POLICE-1] && |
| RTA_PAYLOAD(tb[TCA_CBQ_POLICE-1]) < sizeof(struct tc_cbq_police)) |
| return -EINVAL; |
| #endif |
| |
| if (cl) { |
| /* Check parent */ |
| if (parentid) { |
| if (cl->tparent && cl->tparent->classid != parentid) |
| return -EINVAL; |
| if (!cl->tparent && parentid != TC_H_ROOT) |
| return -EINVAL; |
| } |
| |
| if (tb[TCA_CBQ_RATE-1]) { |
| rtab = qdisc_get_rtab(RTA_DATA(tb[TCA_CBQ_RATE-1]), tb[TCA_CBQ_RTAB-1]); |
| if (rtab == NULL) |
| return -EINVAL; |
| } |
| |
| /* Change class parameters */ |
| sch_tree_lock(sch); |
| |
| if (cl->next_alive != NULL) |
| cbq_deactivate_class(cl); |
| |
| if (rtab) { |
| rtab = xchg(&cl->R_tab, rtab); |
| qdisc_put_rtab(rtab); |
| } |
| |
| if (tb[TCA_CBQ_LSSOPT-1]) |
| cbq_set_lss(cl, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); |
| |
| if (tb[TCA_CBQ_WRROPT-1]) { |
| cbq_rmprio(q, cl); |
| cbq_set_wrr(cl, RTA_DATA(tb[TCA_CBQ_WRROPT-1])); |
| } |
| |
| if (tb[TCA_CBQ_OVL_STRATEGY-1]) |
| cbq_set_overlimit(cl, RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY-1])); |
| |
| #ifdef CONFIG_NET_CLS_POLICE |
| if (tb[TCA_CBQ_POLICE-1]) |
| cbq_set_police(cl, RTA_DATA(tb[TCA_CBQ_POLICE-1])); |
| #endif |
| |
| if (tb[TCA_CBQ_FOPT-1]) |
| cbq_set_fopt(cl, RTA_DATA(tb[TCA_CBQ_FOPT-1])); |
| |
| if (cl->q->q.qlen) |
| cbq_activate_class(cl); |
| |
| sch_tree_unlock(sch); |
| |
| if (tca[TCA_RATE-1]) |
| gen_replace_estimator(&cl->bstats, &cl->rate_est, |
| &sch->dev->queue_lock, |
| tca[TCA_RATE-1]); |
| return 0; |
| } |
| |
| if (parentid == TC_H_ROOT) |
| return -EINVAL; |
| |
| if (tb[TCA_CBQ_WRROPT-1] == NULL || tb[TCA_CBQ_RATE-1] == NULL || |
| tb[TCA_CBQ_LSSOPT-1] == NULL) |
| return -EINVAL; |
| |
| rtab = qdisc_get_rtab(RTA_DATA(tb[TCA_CBQ_RATE-1]), tb[TCA_CBQ_RTAB-1]); |
| if (rtab == NULL) |
| return -EINVAL; |
| |
| if (classid) { |
| err = -EINVAL; |
| if (TC_H_MAJ(classid^sch->handle) || cbq_class_lookup(q, classid)) |
| 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) |
| goto failure; |
| classid = classid|q->hgenerator; |
| } |
| |
| parent = &q->link; |
| if (parentid) { |
| parent = cbq_class_lookup(q, parentid); |
| err = -EINVAL; |
| if (parent == NULL) |
| goto failure; |
| } |
| |
| err = -ENOBUFS; |
| cl = kzalloc(sizeof(*cl), GFP_KERNEL); |
| if (cl == NULL) |
| goto failure; |
| cl->R_tab = rtab; |
| rtab = NULL; |
| cl->refcnt = 1; |
| if (!(cl->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid))) |
| cl->q = &noop_qdisc; |
| cl->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, RTA_DATA(tb[TCA_CBQ_LSSOPT-1])); |
| cbq_set_wrr(cl, RTA_DATA(tb[TCA_CBQ_WRROPT-1])); |
| 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; |
| cl->overlimit = cbq_ovl_classic; |
| if (tb[TCA_CBQ_OVL_STRATEGY-1]) |
| cbq_set_overlimit(cl, RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY-1])); |
| #ifdef CONFIG_NET_CLS_POLICE |
| if (tb[TCA_CBQ_POLICE-1]) |
| cbq_set_police(cl, RTA_DATA(tb[TCA_CBQ_POLICE-1])); |
| #endif |
| if (tb[TCA_CBQ_FOPT-1]) |
| cbq_set_fopt(cl, RTA_DATA(tb[TCA_CBQ_FOPT-1])); |
| sch_tree_unlock(sch); |
| |
| if (tca[TCA_RATE-1]) |
| gen_new_estimator(&cl->bstats, &cl->rate_est, |
| &sch->dev->queue_lock, tca[TCA_RATE-1]); |
| |
| *arg = (unsigned long)cl; |
| return 0; |
| |
| failure: |
| qdisc_put_rtab(rtab); |
| return err; |
| } |
| |
| static int cbq_delete(struct Qdisc *sch, unsigned long arg) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl = (struct cbq_class*)arg; |
| unsigned int qlen; |
| |
| if (cl->filters || cl->children || cl == &q->link) |
| return -EBUSY; |
| |
| sch_tree_lock(sch); |
| |
| qlen = cl->q->q.qlen; |
| qdisc_reset(cl->q); |
| qdisc_tree_decrease_qlen(cl->q, qlen); |
| |
| 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_POLICE |
| 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); |
| |
| if (--cl->refcnt == 0) |
| cbq_destroy_class(sch, cl); |
| |
| return 0; |
| } |
| |
| static struct tcf_proto **cbq_find_tcf(struct Qdisc *sch, unsigned long arg) |
| { |
| struct cbq_sched_data *q = qdisc_priv(sch); |
| struct cbq_class *cl = (struct cbq_class *)arg; |
| |
| if (cl == NULL) |
| cl = &q->link; |
| |
| return &cl->filter_list; |
| } |
| |
| 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); |
| unsigned h; |
| |
| if (arg->stop) |
| return; |
| |
| for (h = 0; h < 16; h++) { |
| struct cbq_class *cl; |
| |
| for (cl = q->classes[h]; cl; cl = cl->next) { |
| if (arg->count < arg->skip) { |
| arg->count++; |
| continue; |
| } |
| if (arg->fn(sch, (unsigned long)cl, arg) < 0) { |
| arg->stop = 1; |
| return; |
| } |
| arg->count++; |
| } |
| } |
| } |
| |
| static struct Qdisc_class_ops cbq_class_ops = { |
| .graft = cbq_graft, |
| .leaf = cbq_leaf, |
| .qlen_notify = cbq_qlen_notify, |
| .get = cbq_get, |
| .put = cbq_put, |
| .change = cbq_change_class, |
| .delete = cbq_delete, |
| .walk = cbq_walk, |
| .tcf_chain = cbq_find_tcf, |
| .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 = { |
| .next = NULL, |
| .cl_ops = &cbq_class_ops, |
| .id = "cbq", |
| .priv_size = sizeof(struct cbq_sched_data), |
| .enqueue = cbq_enqueue, |
| .dequeue = cbq_dequeue, |
| .requeue = cbq_requeue, |
| .drop = cbq_drop, |
| .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"); |