diff options
Diffstat (limited to 'net/sched/sch_htb.c')
| -rw-r--r-- | net/sched/sch_htb.c | 1759 |
1 files changed, 1759 insertions, 0 deletions
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c new file mode 100644 index 0000000..a85935e --- /dev/null +++ b/net/sched/sch_htb.c @@ -0,0 +1,1759 @@ +/* vim: ts=8 sw=8 + * net/sched/sch_htb.c Hierarchical token bucket, feed tree version + * + * 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: Martin Devera, <devik@cdi.cz> + * + * Credits (in time order) for older HTB versions: + * Stef Coene <stef.coene@docum.org> + * HTB support at LARTC mailing list + * Ondrej Kraus, <krauso@barr.cz> + * found missing INIT_QDISC(htb) + * Vladimir Smelhaus, Aamer Akhter, Bert Hubert + * helped a lot to locate nasty class stall bug + * Andi Kleen, Jamal Hadi, Bert Hubert + * code review and helpful comments on shaping + * Tomasz Wrona, <tw@eter.tym.pl> + * created test case so that I was able to fix nasty bug + * Wilfried Weissmann + * spotted bug in dequeue code and helped with fix + * Jiri Fojtasek + * fixed requeue routine + * and many others. thanks. + * + * $Id: sch_htb.c,v 1.25 2003/12/07 11:08:25 devik Exp devik $ + */ +#include <linux/config.h> +#include <linux/module.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <linux/bitops.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/if_ether.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/notifier.h> +#include <net/ip.h> +#include <net/route.h> +#include <linux/skbuff.h> +#include <linux/list.h> +#include <linux/compiler.h> +#include <net/sock.h> +#include <net/pkt_sched.h> +#include <linux/rbtree.h> + +/* HTB algorithm. + Author: devik@cdi.cz + ======================================================================== + HTB is like TBF with multiple classes. It is also similar to CBQ because + it allows to assign priority to each class in hierarchy. + In fact it is another implementation of Floyd's formal sharing. + + Levels: + Each class is assigned level. Leaf has ALWAYS level 0 and root + classes have level TC_HTB_MAXDEPTH-1. Interior nodes has level + one less than their parent. +*/ + +#define HTB_HSIZE 16 /* classid hash size */ +#define HTB_EWMAC 2 /* rate average over HTB_EWMAC*HTB_HSIZE sec */ +#undef HTB_DEBUG /* compile debugging support (activated by tc tool) */ +#define HTB_RATECM 1 /* whether to use rate computer */ +#define HTB_HYSTERESIS 1/* whether to use mode hysteresis for speedup */ +#define HTB_QLOCK(S) spin_lock_bh(&(S)->dev->queue_lock) +#define HTB_QUNLOCK(S) spin_unlock_bh(&(S)->dev->queue_lock) +#define HTB_VER 0x30011 /* major must be matched with number suplied by TC as version */ + +#if HTB_VER >> 16 != TC_HTB_PROTOVER +#error "Mismatched sch_htb.c and pkt_sch.h" +#endif + +/* debugging support; S is subsystem, these are defined: + 0 - netlink messages + 1 - enqueue + 2 - drop & requeue + 3 - dequeue main + 4 - dequeue one prio DRR part + 5 - dequeue class accounting + 6 - class overlimit status computation + 7 - hint tree + 8 - event queue + 10 - rate estimator + 11 - classifier + 12 - fast dequeue cache + + L is level; 0 = none, 1 = basic info, 2 = detailed, 3 = full + q->debug uint32 contains 16 2-bit fields one for subsystem starting + from LSB + */ +#ifdef HTB_DEBUG +#define HTB_DBG_COND(S,L) (((q->debug>>(2*S))&3) >= L) +#define HTB_DBG(S,L,FMT,ARG...) if (HTB_DBG_COND(S,L)) \ + printk(KERN_DEBUG FMT,##ARG) +#define HTB_CHCL(cl) BUG_TRAP((cl)->magic == HTB_CMAGIC) +#define HTB_PASSQ q, +#define HTB_ARGQ struct htb_sched *q, +#define static +#undef __inline__ +#define __inline__ +#undef inline +#define inline +#define HTB_CMAGIC 0xFEFAFEF1 +#define htb_safe_rb_erase(N,R) do { BUG_TRAP((N)->rb_color != -1); \ + if ((N)->rb_color == -1) break; \ + rb_erase(N,R); \ + (N)->rb_color = -1; } while (0) +#else +#define HTB_DBG_COND(S,L) (0) +#define HTB_DBG(S,L,FMT,ARG...) +#define HTB_PASSQ +#define HTB_ARGQ +#define HTB_CHCL(cl) +#define htb_safe_rb_erase(N,R) rb_erase(N,R) +#endif + + +/* used internaly to keep status of single class */ +enum htb_cmode { + HTB_CANT_SEND, /* class can't send and can't borrow */ + HTB_MAY_BORROW, /* class can't send but may borrow */ + HTB_CAN_SEND /* class can send */ +}; + +/* interior & leaf nodes; props specific to leaves are marked L: */ +struct htb_class +{ +#ifdef HTB_DEBUG + unsigned magic; +#endif + /* general class parameters */ + u32 classid; + struct gnet_stats_basic bstats; + struct gnet_stats_queue qstats; + struct gnet_stats_rate_est rate_est; + struct tc_htb_xstats xstats;/* our special stats */ + int refcnt; /* usage count of this class */ + +#ifdef HTB_RATECM + /* rate measurement counters */ + unsigned long rate_bytes,sum_bytes; + unsigned long rate_packets,sum_packets; +#endif + + /* topology */ + int level; /* our level (see above) */ + struct htb_class *parent; /* parent class */ + struct list_head hlist; /* classid hash list item */ + struct list_head sibling; /* sibling list item */ + struct list_head children; /* children list */ + + union { + struct htb_class_leaf { + struct Qdisc *q; + int prio; + int aprio; + int quantum; + int deficit[TC_HTB_MAXDEPTH]; + struct list_head drop_list; + } leaf; + struct htb_class_inner { + struct rb_root feed[TC_HTB_NUMPRIO]; /* feed trees */ + struct rb_node *ptr[TC_HTB_NUMPRIO]; /* current class ptr */ + /* When class changes from state 1->2 and disconnects from + parent's feed then we lost ptr value and start from the + first child again. Here we store classid of the + last valid ptr (used when ptr is NULL). */ + u32 last_ptr_id[TC_HTB_NUMPRIO]; + } inner; + } un; + struct rb_node node[TC_HTB_NUMPRIO]; /* node for self or feed tree */ + struct rb_node pq_node; /* node for event queue */ + unsigned long pq_key; /* the same type as jiffies global */ + + int prio_activity; /* for which prios are we active */ + enum htb_cmode cmode; /* current mode of the class */ + + /* class attached filters */ + struct tcf_proto *filter_list; + int filter_cnt; + + int warned; /* only one warning about non work conserving .. */ + + /* token bucket parameters */ + struct qdisc_rate_table *rate; /* rate table of the class itself */ + struct qdisc_rate_table *ceil; /* ceiling rate (limits borrows too) */ + long buffer,cbuffer; /* token bucket depth/rate */ + long mbuffer; /* max wait time */ + long tokens,ctokens; /* current number of tokens */ + psched_time_t t_c; /* checkpoint time */ +}; + +/* TODO: maybe compute rate when size is too large .. or drop ? */ +static __inline__ long L2T(struct htb_class *cl,struct qdisc_rate_table *rate, + int size) +{ + int slot = size >> rate->rate.cell_log; + if (slot > 255) { + cl->xstats.giants++; + slot = 255; + } + return rate->data[slot]; +} + +struct htb_sched +{ + struct list_head root; /* root classes list */ + struct list_head hash[HTB_HSIZE]; /* hashed by classid */ + struct list_head drops[TC_HTB_NUMPRIO]; /* active leaves (for drops) */ + + /* self list - roots of self generating tree */ + struct rb_root row[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; + int row_mask[TC_HTB_MAXDEPTH]; + struct rb_node *ptr[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; + u32 last_ptr_id[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO]; + + /* self wait list - roots of wait PQs per row */ + struct rb_root wait_pq[TC_HTB_MAXDEPTH]; + + /* time of nearest event per level (row) */ + unsigned long near_ev_cache[TC_HTB_MAXDEPTH]; + + /* cached value of jiffies in dequeue */ + unsigned long jiffies; + + /* whether we hit non-work conserving class during this dequeue; we use */ + int nwc_hit; /* this to disable mindelay complaint in dequeue */ + + int defcls; /* class where unclassified flows go to */ + u32 debug; /* subsystem debug levels */ + + /* filters for qdisc itself */ + struct tcf_proto *filter_list; + int filter_cnt; + + int rate2quantum; /* quant = rate / rate2quantum */ + psched_time_t now; /* cached dequeue time */ + struct timer_list timer; /* send delay timer */ +#ifdef HTB_RATECM + struct timer_list rttim; /* rate computer timer */ + int recmp_bucket; /* which hash bucket to recompute next */ +#endif + + /* non shaped skbs; let them go directly thru */ + struct sk_buff_head direct_queue; + int direct_qlen; /* max qlen of above */ + + long direct_pkts; +}; + +/* compute hash of size HTB_HSIZE for given handle */ +static __inline__ int htb_hash(u32 h) +{ +#if HTB_HSIZE != 16 + #error "Declare new hash for your HTB_HSIZE" +#endif + h ^= h>>8; /* stolen from cbq_hash */ + h ^= h>>4; + return h & 0xf; +} + +/* find class in global hash table using given handle */ +static __inline__ struct htb_class *htb_find(u32 handle, struct Qdisc *sch) +{ + struct htb_sched *q = qdisc_priv(sch); + struct list_head *p; + if (TC_H_MAJ(handle) != sch->handle) + return NULL; + + list_for_each (p,q->hash+htb_hash(handle)) { + struct htb_class *cl = list_entry(p,struct htb_class,hlist); + if (cl->classid == handle) + return cl; + } + return NULL; +} + +/** + * htb_classify - classify a packet into class + * + * It returns NULL if the packet should be dropped or -1 if the packet + * should be passed directly thru. In all other cases leaf class is returned. + * We allow direct class selection by classid in priority. The we examine + * filters in qdisc and in inner nodes (if higher filter points to the inner + * node). If we end up with classid MAJOR:0 we enqueue the skb into special + * internal fifo (direct). These packets then go directly thru. If we still + * have no valid leaf we try to use MAJOR:default leaf. It still unsuccessfull + * then finish and return direct queue. + */ +#define HTB_DIRECT (struct htb_class*)-1 +static inline u32 htb_classid(struct htb_class *cl) +{ + return (cl && cl != HTB_DIRECT) ? cl->classid : TC_H_UNSPEC; +} + +static struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch, int *qerr) +{ + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl; + struct tcf_result res; + struct tcf_proto *tcf; + int result; + + /* allow to select class by setting skb->priority to valid classid; + note that nfmark can be used too by attaching filter fw with no + rules in it */ + if (skb->priority == sch->handle) + return HTB_DIRECT; /* X:0 (direct flow) selected */ + if ((cl = htb_find(skb->priority,sch)) != NULL && cl->level == 0) + return cl; + + *qerr = NET_XMIT_DROP; + tcf = q->filter_list; + while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) { +#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) + if (result == TC_POLICE_SHOT) + return HTB_DIRECT; +#endif + if ((cl = (void*)res.class) == NULL) { + if (res.classid == sch->handle) + return HTB_DIRECT; /* X:0 (direct flow) */ + if ((cl = htb_find(res.classid,sch)) == NULL) + break; /* filter selected invalid classid */ + } + if (!cl->level) + return cl; /* we hit leaf; return it */ + + /* we have got inner class; apply inner filter chain */ + tcf = cl->filter_list; + } + /* classification failed; try to use default class */ + cl = htb_find(TC_H_MAKE(TC_H_MAJ(sch->handle),q->defcls),sch); + if (!cl || cl->level) + return HTB_DIRECT; /* bad default .. this is safe bet */ + return cl; +} + +#ifdef HTB_DEBUG +static void htb_next_rb_node(struct rb_node **n); +#define HTB_DUMTREE(root,memb) if(root) { \ + struct rb_node *n = (root)->rb_node; \ + while (n->rb_left) n = n->rb_left; \ + while (n) { \ + struct htb_class *cl = rb_entry(n, struct htb_class, memb); \ + printk(" %x",cl->classid); htb_next_rb_node (&n); \ + } } + +static void htb_debug_dump (struct htb_sched *q) +{ + int i,p; + printk(KERN_DEBUG "htb*g j=%lu lj=%lu\n",jiffies,q->jiffies); + /* rows */ + for (i=TC_HTB_MAXDEPTH-1;i>=0;i--) { + printk(KERN_DEBUG "htb*r%d m=%x",i,q->row_mask[i]); + for (p=0;p<TC_HTB_NUMPRIO;p++) { + if (!q->row[i][p].rb_node) continue; + printk(" p%d:",p); + HTB_DUMTREE(q->row[i]+p,node[p]); + } + printk("\n"); + } + /* classes */ + for (i = 0; i < HTB_HSIZE; i++) { + struct list_head *l; + list_for_each (l,q->hash+i) { + struct htb_class *cl = list_entry(l,struct htb_class,hlist); + long diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32)cl->mbuffer); + printk(KERN_DEBUG "htb*c%x m=%d t=%ld c=%ld pq=%lu df=%ld ql=%d " + "pa=%x f:", + cl->classid,cl->cmode,cl->tokens,cl->ctokens, + cl->pq_node.rb_color==-1?0:cl->pq_key,diff, + cl->level?0:cl->un.leaf.q->q.qlen,cl->prio_activity); + if (cl->level) + for (p=0;p<TC_HTB_NUMPRIO;p++) { + if (!cl->un.inner.feed[p].rb_node) continue; + printk(" p%d a=%x:",p,cl->un.inner.ptr[p]?rb_entry(cl->un.inner.ptr[p], struct htb_class,node[p])->classid:0); + HTB_DUMTREE(cl->un.inner.feed+p,node[p]); + } + printk("\n"); + } + } +} +#endif +/** + * htb_add_to_id_tree - adds class to the round robin list + * + * Routine adds class to the list (actually tree) sorted by classid. + * Make sure that class is not already on such list for given prio. + */ +static void htb_add_to_id_tree (HTB_ARGQ struct rb_root *root, + struct htb_class *cl,int prio) +{ + struct rb_node **p = &root->rb_node, *parent = NULL; + HTB_DBG(7,3,"htb_add_id_tree cl=%X prio=%d\n",cl->classid,prio); +#ifdef HTB_DEBUG + if (cl->node[prio].rb_color != -1) { BUG_TRAP(0); return; } + HTB_CHCL(cl); + if (*p) { + struct htb_class *x = rb_entry(*p,struct htb_class,node[prio]); + HTB_CHCL(x); + } +#endif + while (*p) { + struct htb_class *c; parent = *p; + c = rb_entry(parent, struct htb_class, node[prio]); + HTB_CHCL(c); + if (cl->classid > c->classid) + p = &parent->rb_right; + else + p = &parent->rb_left; + } + rb_link_node(&cl->node[prio], parent, p); + rb_insert_color(&cl->node[prio], root); +} + +/** + * htb_add_to_wait_tree - adds class to the event queue with delay + * + * The class is added to priority event queue to indicate that class will + * change its mode in cl->pq_key microseconds. Make sure that class is not + * already in the queue. + */ +static void htb_add_to_wait_tree (struct htb_sched *q, + struct htb_class *cl,long delay,int debug_hint) +{ + struct rb_node **p = &q->wait_pq[cl->level].rb_node, *parent = NULL; + HTB_DBG(7,3,"htb_add_wt cl=%X key=%lu\n",cl->classid,cl->pq_key); +#ifdef HTB_DEBUG + if (cl->pq_node.rb_color != -1) { BUG_TRAP(0); return; } + HTB_CHCL(cl); + if ((delay <= 0 || delay > cl->mbuffer) && net_ratelimit()) + printk(KERN_ERR "HTB: suspicious delay in wait_tree d=%ld cl=%X h=%d\n",delay,cl->classid,debug_hint); +#endif + cl->pq_key = q->jiffies + PSCHED_US2JIFFIE(delay); + if (cl->pq_key == q->jiffies) + cl->pq_key++; + + /* update the nearest event cache */ + if (time_after(q->near_ev_cache[cl->level], cl->pq_key)) + q->near_ev_cache[cl->level] = cl->pq_key; + + while (*p) { + struct htb_class *c; parent = *p; + c = rb_entry(parent, struct htb_class, pq_node); + if (time_after_eq(cl->pq_key, c->pq_key)) + p = &parent->rb_right; + else + p = &parent->rb_left; + } + rb_link_node(&cl->pq_node, parent, p); + rb_insert_color(&cl->pq_node, &q->wait_pq[cl->level]); +} + +/** + * htb_next_rb_node - finds next node in binary tree + * + * When we are past last key we return NULL. + * Average complexity is 2 steps per call. + */ +static void htb_next_rb_node(struct rb_node **n) +{ + *n = rb_next(*n); +} + +/** + * htb_add_class_to_row - add class to its row + * + * The class is added to row at priorities marked in mask. + * It does nothing if mask == 0. + */ +static inline void htb_add_class_to_row(struct htb_sched *q, + struct htb_class *cl,int mask) +{ + HTB_DBG(7,2,"htb_addrow cl=%X mask=%X rmask=%X\n", + cl->classid,mask,q->row_mask[cl->level]); + HTB_CHCL(cl); + q->row_mask[cl->level] |= mask; + while (mask) { + int prio = ffz(~mask); + mask &= ~(1 << prio); + htb_add_to_id_tree(HTB_PASSQ q->row[cl->level]+prio,cl,prio); + } +} + +/** + * htb_remove_class_from_row - removes class from its row + * + * The class is removed from row at priorities marked in mask. + * It does nothing if mask == 0. + */ +static __inline__ void htb_remove_class_from_row(struct htb_sched *q, + struct htb_class *cl,int mask) +{ + int m = 0; + HTB_CHCL(cl); + while (mask) { + int prio = ffz(~mask); + mask &= ~(1 << prio); + if (q->ptr[cl->level][prio] == cl->node+prio) + htb_next_rb_node(q->ptr[cl->level]+prio); + htb_safe_rb_erase(cl->node + prio,q->row[cl->level]+prio); + if (!q->row[cl->level][prio].rb_node) + m |= 1 << prio; + } + HTB_DBG(7,2,"htb_delrow cl=%X mask=%X rmask=%X maskdel=%X\n", + cl->classid,mask,q->row_mask[cl->level],m); + q->row_mask[cl->level] &= ~m; +} + +/** + * htb_activate_prios - creates active classe's feed chain + * + * The class is connected to ancestors and/or appropriate rows + * for priorities it is participating on. cl->cmode must be new + * (activated) mode. It does nothing if cl->prio_activity == 0. + */ +static void htb_activate_prios(struct htb_sched *q,struct htb_class *cl) +{ + struct htb_class *p = cl->parent; + long m,mask = cl->prio_activity; + HTB_DBG(7,2,"htb_act_prios cl=%X mask=%lX cmode=%d\n",cl->classid,mask,cl->cmode); + HTB_CHCL(cl); + + while (cl->cmode == HTB_MAY_BORROW && p && mask) { + HTB_CHCL(p); + m = mask; while (m) { + int prio = ffz(~m); + m &= ~(1 << prio); + + if (p->un.inner.feed[prio].rb_node) + /* parent already has its feed in use so that + reset bit in mask as parent is already ok */ + mask &= ~(1 << prio); + + htb_add_to_id_tree(HTB_PASSQ p->un.inner.feed+prio,cl,prio); + } + HTB_DBG(7,3,"htb_act_pr_aft p=%X pact=%X mask=%lX pmode=%d\n", + p->classid,p->prio_activity,mask,p->cmode); + p->prio_activity |= mask; + cl = p; p = cl->parent; + HTB_CHCL(cl); + } + if (cl->cmode == HTB_CAN_SEND && mask) + htb_add_class_to_row(q,cl,mask); +} + +/** + * htb_deactivate_prios - remove class from feed chain + * + * cl->cmode must represent old mode (before deactivation). It does + * nothing if cl->prio_activity == 0. Class is removed from all feed + * chains and rows. + */ +static void htb_deactivate_prios(struct htb_sched *q, struct htb_class *cl) +{ + struct htb_class *p = cl->parent; + long m,mask = cl->prio_activity; + HTB_DBG(7,2,"htb_deact_prios cl=%X mask=%lX cmode=%d\n",cl->classid,mask,cl->cmode); + HTB_CHCL(cl); + + while (cl->cmode == HTB_MAY_BORROW && p && mask) { + m = mask; mask = 0; + while (m) { + int prio = ffz(~m); + m &= ~(1 << prio); + + if (p->un.inner.ptr[prio] == cl->node+prio) { + /* we are removing child which is pointed to from + parent feed - forget the pointer but remember + classid */ + p->un.inner.last_ptr_id[prio] = cl->classid; + p->un.inner.ptr[prio] = NULL; + } + + htb_safe_rb_erase(cl->node + prio,p->un.inner.feed + prio); + + if (!p->un.inner.feed[prio].rb_node) + mask |= 1 << prio; + } + HTB_DBG(7,3,"htb_deact_pr_aft p=%X pact=%X mask=%lX pmode=%d\n", + p->classid,p->prio_activity,mask,p->cmode); + p->prio_activity &= ~mask; + cl = p; p = cl->parent; + HTB_CHCL(cl); + } + if (cl->cmode == HTB_CAN_SEND && mask) + htb_remove_class_from_row(q,cl,mask); +} + +/** + * htb_class_mode - computes and returns current class mode + * + * It computes cl's mode at time cl->t_c+diff and returns it. If mode + * is not HTB_CAN_SEND then cl->pq_key is updated to time difference + * from now to time when cl will change its state. + * Also it is worth to note that class mode doesn't change simply + * at cl->{c,}tokens == 0 but there can rather be hysteresis of + * 0 .. -cl->{c,}buffer range. It is meant to limit number of + * mode transitions per time unit. The speed gain is about 1/6. + */ +static __inline__ enum htb_cmode +htb_class_mode(struct htb_class *cl,long *diff) +{ + long toks; + + if ((toks = (cl->ctokens + *diff)) < ( +#if HTB_HYSTERESIS + cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : +#endif + 0)) { + *diff = -toks; + return HTB_CANT_SEND; + } + if ((toks = (cl->tokens + *diff)) >= ( +#if HTB_HYSTERESIS + cl->cmode == HTB_CAN_SEND ? -cl->buffer : +#endif + 0)) + return HTB_CAN_SEND; + + *diff = -toks; + return HTB_MAY_BORROW; +} + +/** + * htb_change_class_mode - changes classe's mode + * + * This should be the only way how to change classe's mode under normal + * cirsumstances. Routine will update feed lists linkage, change mode + * and add class to the wait event queue if appropriate. New mode should + * be different from old one and cl->pq_key has to be valid if changing + * to mode other than HTB_CAN_SEND (see htb_add_to_wait_tree). + */ +static void +htb_change_class_mode(struct htb_sched *q, struct htb_class *cl, long *diff) +{ + enum htb_cmode new_mode = htb_class_mode(cl,diff); + + HTB_CHCL(cl); + HTB_DBG(7,1,"htb_chging_clmode %d->%d cl=%X\n",cl->cmode,new_mode,cl->classid); + + if (new_mode == cl->cmode) + return; + + if (cl->prio_activity) { /* not necessary: speed optimization */ + if (cl->cmode != HTB_CANT_SEND) + htb_deactivate_prios(q,cl); + cl->cmode = new_mode; + if (new_mode != HTB_CANT_SEND) + htb_activate_prios(q,cl); + } else + cl->cmode = new_mode; +} + +/** + * htb_activate - inserts leaf cl into appropriate active feeds + * + * Routine learns (new) priority of leaf and activates feed chain + * for the prio. It can be called on already active leaf safely. + * It also adds leaf into droplist. + */ +static __inline__ void htb_activate(struct htb_sched *q,struct htb_class *cl) +{ + BUG_TRAP(!cl->level && cl->un.leaf.q && cl->un.leaf.q->q.qlen); + HTB_CHCL(cl); + if (!cl->prio_activity) { + cl->prio_activity = 1 << (cl->un.leaf.aprio = cl->un.leaf.prio); + htb_activate_prios(q,cl); + list_add_tail(&cl->un.leaf.drop_list,q->drops+cl->un.leaf.aprio); + } +} + +/** + * htb_deactivate - remove leaf cl from active feeds + * + * Make sure that leaf is active. In the other words it can't be called + * with non-active leaf. It also removes class from the drop list. + */ +static __inline__ void +htb_deactivate(struct htb_sched *q,struct htb_class *cl) +{ + BUG_TRAP(cl->prio_activity); + HTB_CHCL(cl); + htb_deactivate_prios(q,cl); + cl->prio_activity = 0; + list_del_init(&cl->un.leaf.drop_list); +} + +static int htb_enqueue(struct sk_buff *skb, struct Qdisc *sch) +{ + int ret; + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl = htb_classify(skb,sch,&ret); + + if (cl == HTB_DIRECT) { + /* enqueue to helper queue */ + if (q->direct_queue.qlen < q->direct_qlen) { + __skb_queue_tail(&q->direct_queue, skb); + q->direct_pkts++; + } +#ifdef CONFIG_NET_CLS_ACT + } else if (!cl) { + if (ret == NET_XMIT_DROP) + sch->qstats.drops++; + kfree_skb (skb); + return ret; +#endif + } else if (cl->un.leaf.q->enqueue(skb, cl->un.leaf.q) != NET_XMIT_SUCCESS) { + sch->qstats.drops++; + cl->qstats.drops++; + return NET_XMIT_DROP; + } else { + cl->bstats.packets++; cl->bstats.bytes += skb->len; + htb_activate (q,cl); + } + + sch->q.qlen++; + sch->bstats.packets++; sch->bstats.bytes += skb->len; + HTB_DBG(1,1,"htb_enq_ok cl=%X skb=%p\n",(cl && cl != HTB_DIRECT)?cl->classid:0,skb); + return NET_XMIT_SUCCESS; +} + +/* TODO: requeuing packet charges it to policers again !! */ +static int htb_requeue(struct sk_buff *skb, struct Qdisc *sch) +{ + struct htb_sched *q = qdisc_priv(sch); + int ret = NET_XMIT_SUCCESS; + struct htb_class *cl = htb_classify(skb,sch, &ret); + struct sk_buff *tskb; + + if (cl == HTB_DIRECT || !cl) { + /* enqueue to helper queue */ + if (q->direct_queue.qlen < q->direct_qlen && cl) { + __skb_queue_head(&q->direct_queue, skb); + } else { + __skb_queue_head(&q->direct_queue, skb); + tskb = __skb_dequeue_tail(&q->direct_queue); + kfree_skb (tskb); + sch->qstats.drops++; + return NET_XMIT_CN; + } + } else if (cl->un.leaf.q->ops->requeue(skb, cl->un.leaf.q) != NET_XMIT_SUCCESS) { + sch->qstats.drops++; + cl->qstats.drops++; + return NET_XMIT_DROP; + } else + htb_activate (q,cl); + + sch->q.qlen++; + sch->qstats.requeues++; + HTB_DBG(1,1,"htb_req_ok cl=%X skb=%p\n",(cl && cl != HTB_DIRECT)?cl->classid:0,skb); + return NET_XMIT_SUCCESS; +} + +static void htb_timer(unsigned long arg) +{ + struct Qdisc *sch = (struct Qdisc*)arg; + sch->flags &= ~TCQ_F_THROTTLED; + wmb(); + netif_schedule(sch->dev); +} + +#ifdef HTB_RATECM +#define RT_GEN(D,R) R+=D-(R/HTB_EWMAC);D=0 +static void htb_rate_timer(unsigned long arg) +{ + struct Qdisc *sch = (struct Qdisc*)arg; + struct htb_sched *q = qdisc_priv(sch); + struct list_head *p; + + /* lock queue so that we can muck with it */ + HTB_QLOCK(sch); + HTB_DBG(10,1,"htb_rttmr j=%ld\n",jiffies); + + q->rttim.expires = jiffies + HZ; + add_timer(&q->rttim); + + /* scan and recompute one bucket at time */ + if (++q->recmp_bucket >= HTB_HSIZE) + q->recmp_bucket = 0; + list_for_each (p,q->hash+q->recmp_bucket) { + struct htb_class *cl = list_entry(p,struct htb_class,hlist); + HTB_DBG(10,2,"htb_rttmr_cl cl=%X sbyte=%lu spkt=%lu\n", + cl->classid,cl->sum_bytes,cl->sum_packets); + RT_GEN (cl->sum_bytes,cl->rate_bytes); + RT_GEN (cl->sum_packets,cl->rate_packets); + } + HTB_QUNLOCK(sch); +} +#endif + +/** + * htb_charge_class - charges amount "bytes" to leaf and ancestors + * + * Routine assumes that packet "bytes" long was dequeued from leaf cl + * borrowing from "level". It accounts bytes to ceil leaky bucket for + * leaf and all ancestors and to rate bucket for ancestors at levels + * "level" and higher. It also handles possible change of mode resulting + * from the update. Note that mode can also increase here (MAY_BORROW to + * CAN_SEND) because we can use more precise clock that event queue here. + * In such case we remove class from event queue first. + */ +static void htb_charge_class(struct htb_sched *q,struct htb_class *cl, + int level,int bytes) +{ + long toks,diff; + enum htb_cmode old_mode; + HTB_DBG(5,1,"htb_chrg_cl cl=%X lev=%d len=%d\n",cl->classid,level,bytes); + +#define HTB_ACCNT(T,B,R) toks = diff + cl->T; \ + if (toks > cl->B) toks = cl->B; \ + toks -= L2T(cl, cl->R, bytes); \ + if (toks <= -cl->mbuffer) toks = 1-cl->mbuffer; \ + cl->T = toks + + while (cl) { + HTB_CHCL(cl); + diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32)cl->mbuffer); +#ifdef HTB_DEBUG + if (diff > cl->mbuffer || diff < 0 || PSCHED_TLESS(q->now, cl->t_c)) { + if (net_ratelimit()) + printk(KERN_ERR "HTB: bad diff in charge, cl=%X diff=%lX now=%Lu then=%Lu j=%lu\n", + cl->classid, diff, +#ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY + q->now.tv_sec * 1000000ULL + q->now.tv_usec, + cl->t_c.tv_sec * 1000000ULL + cl->t_c.tv_usec, +#else + (unsigned long long) q->now, + (unsigned long long) cl->t_c, +#endif + q->jiffies); + diff = 1000; + } +#endif + if (cl->level >= level) { + if (cl->level == level) cl->xstats.lends++; + HTB_ACCNT (tokens,buffer,rate); + } else { + cl->xstats.borrows++; + cl->tokens += diff; /* we moved t_c; update tokens */ + } + HTB_ACCNT (ctokens,cbuffer,ceil); + cl->t_c = q->now; + HTB_DBG(5,2,"htb_chrg_clp cl=%X diff=%ld tok=%ld ctok=%ld\n",cl->classid,diff,cl->tokens,cl->ctokens); + + old_mode = cl->cmode; diff = 0; + htb_change_class_mode(q,cl,&diff); + if (old_mode != cl->cmode) { + if (old_mode != HTB_CAN_SEND) + htb_safe_rb_erase(&cl->pq_node,q->wait_pq+cl->level); + if (cl->cmode != HTB_CAN_SEND) + htb_add_to_wait_tree (q,cl,diff,1); + } + +#ifdef HTB_RATECM + /* update rate counters */ + cl->sum_bytes += bytes; cl->sum_packets++; +#endif + + /* update byte stats except for leaves which are already updated */ + if (cl->level) { + cl->bstats.bytes += bytes; + cl->bstats.packets++; + } + cl = cl->parent; + } +} + +/** + * htb_do_events - make mode changes to classes at the level + * + * Scans event queue for pending events and applies them. Returns jiffies to + * next pending event (0 for no event in pq). + * Note: Aplied are events whose have cl->pq_key <= jiffies. + */ +static long htb_do_events(struct htb_sched *q,int level) +{ + int i; + HTB_DBG(8,1,"htb_do_events l=%d root=%p rmask=%X\n", + level,q->wait_pq[level].rb_node,q->row_mask[level]); + for (i = 0; i < 500; i++) { + struct htb_class *cl; + long diff; + struct rb_node *p = q->wait_pq[level].rb_node; + if (!p) return 0; + while (p->rb_left) p = p->rb_left; + + cl = rb_entry(p, struct htb_class, pq_node); + if (time_after(cl->pq_key, q->jiffies)) { + HTB_DBG(8,3,"htb_do_ev_ret delay=%ld\n",cl->pq_key - q->jiffies); + return cl->pq_key - q->jiffies; + } + htb_safe_rb_erase(p,q->wait_pq+level); + diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32)cl->mbuffer); +#ifdef HTB_DEBUG + if (diff > cl->mbuffer || diff < 0 || PSCHED_TLESS(q->now, cl->t_c)) { + if (net_ratelimit()) + printk(KERN_ERR "HTB: bad diff in events, cl=%X diff=%lX now=%Lu then=%Lu j=%lu\n", + cl->classid, diff, +#ifdef CONFIG_NET_SCH_CLK_GETTIMEOFDAY + q->now.tv_sec * 1000000ULL + q->now.tv_usec, + cl->t_c.tv_sec * 1000000ULL + cl->t_c.tv_usec, +#else + (unsigned long long) q->now, + (unsigned long long) cl->t_c, +#endif + q->jiffies); + diff = 1000; + } +#endif + htb_change_class_mode(q,cl,&diff); + if (cl->cmode != HTB_CAN_SEND) + htb_add_to_wait_tree (q,cl,diff,2); + } + if (net_ratelimit()) + printk(KERN_WARNING "htb: too many events !\n"); + return HZ/10; +} + +/* Returns class->node+prio from id-tree where classe's id is >= id. NULL + is no such one exists. */ +static struct rb_node * +htb_id_find_next_upper(int prio,struct rb_node *n,u32 id) +{ + struct rb_node *r = NULL; + while (n) { + struct htb_class *cl = rb_entry(n,struct htb_class,node[prio]); + if (id == cl->classid) return n; + + if (id > cl->classid) { + n = n->rb_right; + } else { + r = n; + n = n->rb_left; + } + } + return r; +} + +/** + * htb_lookup_leaf - returns next leaf class in DRR order + * + * Find leaf where current feed pointers points to. + */ +static struct htb_class * +htb_lookup_leaf(HTB_ARGQ struct rb_root *tree,int prio,struct rb_node **pptr,u32 *pid) +{ + int i; + struct { + struct rb_node *root; + struct rb_node **pptr; + u32 *pid; + } stk[TC_HTB_MAXDEPTH],*sp = stk; + + BUG_TRAP(tree->rb_node); + sp->root = tree->rb_node; + sp->pptr = pptr; + sp->pid = pid; + + for (i = 0; i < 65535; i++) { + HTB_DBG(4,2,"htb_lleaf ptr=%p pid=%X\n",*sp->pptr,*sp->pid); + + if (!*sp->pptr && *sp->pid) { + /* ptr was invalidated but id is valid - try to recover + the original or next ptr */ + *sp->pptr = htb_id_find_next_upper(prio,sp->root,*sp->pid); + } + *sp->pid = 0; /* ptr is valid now so that remove this hint as it + can become out of date quickly */ + if (!*sp->pptr) { /* we are at right end; rewind & go up */ + *sp->pptr = sp->root; + while ((*sp->pptr)->rb_left) + *sp->pptr = (*sp->pptr)->rb_left; + if (sp > stk) { + sp--; + BUG_TRAP(*sp->pptr); if(!*sp->pptr) return NULL; + htb_next_rb_node (sp->pptr); + } + } else { + struct htb_class *cl; + cl = rb_entry(*sp->pptr,struct htb_class,node[prio]); + HTB_CHCL(cl); + if (!cl->level) + return cl; + (++sp)->root = cl->un.inner.feed[prio].rb_node; + sp->pptr = cl->un.inner.ptr+prio; + sp->pid = cl->un.inner.last_ptr_id+prio; + } + } + BUG_TRAP(0); + return NULL; +} + +/* dequeues packet at given priority and level; call only if + you are sure that there is active class at prio/level */ +static struct sk_buff * +htb_dequeue_tree(struct htb_sched *q,int prio,int level) +{ + struct sk_buff *skb = NULL; + struct htb_class *cl,*start; + /* look initial class up in the row */ + start = cl = htb_lookup_leaf (HTB_PASSQ q->row[level]+prio,prio, + q->ptr[level]+prio,q->last_ptr_id[level]+prio); + + do { +next: + BUG_TRAP(cl); + if (!cl) return NULL; + HTB_DBG(4,1,"htb_deq_tr prio=%d lev=%d cl=%X defic=%d\n", + prio,level,cl->classid,cl->un.leaf.deficit[level]); + + /* class can be empty - it is unlikely but can be true if leaf + qdisc drops packets in enqueue routine or if someone used + graft operation on the leaf since last dequeue; + simply deactivate and skip such class */ + if (unlikely(cl->un.leaf.q->q.qlen == 0)) { + struct htb_class *next; + htb_deactivate(q,cl); + + /* row/level might become empty */ + if ((q->row_mask[level] & (1 << prio)) == 0) + return NULL; + + next = htb_lookup_leaf (HTB_PASSQ q->row[level]+prio, + prio,q->ptr[level]+prio,q->last_ptr_id[level]+prio); + + if (cl == start) /* fix start if we just deleted it */ + start = next; + cl = next; + goto next; + } + + if (likely((skb = cl->un.leaf.q->dequeue(cl->un.leaf.q)) != NULL)) + break; + if (!cl->warned) { + printk(KERN_WARNING "htb: class %X isn't work conserving ?!\n",cl->classid); + cl->warned = 1; + } + q->nwc_hit++; + htb_next_rb_node((level?cl->parent->un.inner.ptr:q->ptr[0])+prio); + cl = htb_lookup_leaf (HTB_PASSQ q->row[level]+prio,prio,q->ptr[level]+prio, + q->last_ptr_id[level]+prio); + + } while (cl != start); + + if (likely(skb != NULL)) { + if ((cl->un.leaf.deficit[level] -= skb->len) < 0) { + HTB_DBG(4,2,"htb_next_cl oldptr=%p quant_add=%d\n", + level?cl->parent->un.inner.ptr[prio]:q->ptr[0][prio],cl->un.leaf.quantum); + cl->un.leaf.deficit[level] += cl->un.leaf.quantum; + htb_next_rb_node((level?cl->parent->un.inner.ptr:q->ptr[0])+prio); + } + /* this used to be after charge_class but this constelation + gives us slightly better performance */ + if (!cl->un.leaf.q->q.qlen) + htb_deactivate (q,cl); + htb_charge_class (q,cl,level,skb->len); + } + return skb; +} + +static void htb_delay_by(struct Qdisc *sch,long delay) +{ + struct htb_sched *q = qdisc_priv(sch); + if (delay <= 0) delay = 1; + if (unlikely(delay > 5*HZ)) { + if (net_ratelimit()) + printk(KERN_INFO "HTB delay %ld > 5sec\n", delay); + delay = 5*HZ; + } + /* why don't use jiffies here ? because expires can be in past */ + mod_timer(&q->timer, q->jiffies + delay); + sch->flags |= TCQ_F_THROTTLED; + sch->qstats.overlimits++; + HTB_DBG(3,1,"htb_deq t_delay=%ld\n",delay); +} + +static struct sk_buff *htb_dequeue(struct Qdisc *sch) +{ + struct sk_buff *skb = NULL; + struct htb_sched *q = qdisc_priv(sch); + int level; + long min_delay; +#ifdef HTB_DEBUG + int evs_used = 0; +#endif + + q->jiffies = jiffies; + HTB_DBG(3,1,"htb_deq dircnt=%d qlen=%d\n",skb_queue_len(&q->direct_queue), + sch->q.qlen); + + /* try to dequeue direct packets as high prio (!) to minimize cpu work */ + if ((skb = __skb_dequeue(&q->direct_queue)) != NULL) { + sch->flags &= ~TCQ_F_THROTTLED; + sch->q.qlen--; + return skb; + } + + if (!sch->q.qlen) goto fin; + PSCHED_GET_TIME(q->now); + + min_delay = LONG_MAX; + q->nwc_hit = 0; + for (level = 0; level < TC_HTB_MAXDEPTH; level++) { + /* common case optimization - skip event handler quickly */ + int m; + long delay; + if (time_after_eq(q->jiffies, q->near_ev_cache[level])) { + delay = htb_do_events(q,level); + q->near_ev_cache[level] = q->jiffies + (delay ? delay : HZ); +#ifdef HTB_DEBUG + evs_used++; +#endif + } else + delay = q->near_ev_cache[level] - q->jiffies; + + if (delay && min_delay > delay) + min_delay = delay; + m = ~q->row_mask[level]; + while (m != (int)(-1)) { + int prio = ffz (m); + m |= 1 << prio; + skb = htb_dequeue_tree(q,prio,level); + if (likely(skb != NULL)) { + sch->q.qlen--; + sch->flags &= ~TCQ_F_THROTTLED; + goto fin; + } + } + } +#ifdef HTB_DEBUG + if (!q->nwc_hit && min_delay >= 10*HZ && net_ratelimit()) { + if (min_delay == LONG_MAX) { + printk(KERN_ERR "HTB: dequeue bug (%d,%lu,%lu), report it please !\n", + evs_used,q->jiffies,jiffies); + htb_debug_dump(q); + } else + printk(KERN_WARNING "HTB: mindelay=%ld, some class has " + "too small rate\n",min_delay); + } +#endif + htb_delay_by (sch,min_delay > 5*HZ ? 5*HZ : min_delay); +fin: + HTB_DBG(3,1,"htb_deq_end %s j=%lu skb=%p\n",sch->dev->name,q->jiffies,skb); + return skb; +} + +/* try to drop from each class (by prio) until one succeed */ +static unsigned int htb_drop(struct Qdisc* sch) +{ + struct htb_sched *q = qdisc_priv(sch); + int prio; + + for (prio = TC_HTB_NUMPRIO - 1; prio >= 0; prio--) { + struct list_head *p; + list_for_each (p,q->drops+prio) { + struct htb_class *cl = list_entry(p, struct htb_class, + un.leaf.drop_list); + unsigned int len; + if (cl->un.leaf.q->ops->drop && + (len = cl->un.leaf.q->ops->drop(cl->un.leaf.q))) { + sch->q.qlen--; + if (!cl->un.leaf.q->q.qlen) + htb_deactivate (q,cl); + return len; + } + } + } + return 0; +} + +/* reset all classes */ +/* always caled under BH & queue lock */ +static void htb_reset(struct Qdisc* sch) +{ + struct htb_sched *q = qdisc_priv(sch); + int i; + HTB_DBG(0,1,"htb_reset sch=%p, handle=%X\n",sch,sch->handle); + + for (i = 0; i < HTB_HSIZE; i++) { + struct list_head *p; + list_for_each (p,q->hash+i) { + struct htb_class *cl = list_entry(p,struct htb_class,hlist); + if (cl->level) + memset(&cl->un.inner,0,sizeof(cl->un.inner)); + else { + if (cl->un.leaf.q) + qdisc_reset(cl->un.leaf.q); + INIT_LIST_HEAD(&cl->un.leaf.drop_list); + } + cl->prio_activity = 0; + cl->cmode = HTB_CAN_SEND; +#ifdef HTB_DEBUG + cl->pq_node.rb_color = -1; + memset(cl->node,255,sizeof(cl->node)); +#endif + + } + } + sch->flags &= ~TCQ_F_THROTTLED; + del_timer(&q->timer); + __skb_queue_purge(&q->direct_queue); + sch->q.qlen = 0; + memset(q->row,0,sizeof(q->row)); + memset(q->row_mask,0,sizeof(q->row_mask)); + memset(q->wait_pq,0,sizeof(q->wait_pq)); + memset(q->ptr,0,sizeof(q->ptr)); + for (i = 0; i < TC_HTB_NUMPRIO; i++) + INIT_LIST_HEAD(q->drops+i); +} + +static int htb_init(struct Qdisc *sch, struct rtattr *opt) +{ + struct htb_sched *q = qdisc_priv(sch); + struct rtattr *tb[TCA_HTB_INIT]; + struct tc_htb_glob *gopt; + int i; +#ifdef HTB_DEBUG + printk(KERN_INFO "HTB init, kernel part version %d.%d\n", + HTB_VER >> 16,HTB_VER & 0xffff); +#endif + if (!opt || rtattr_parse_nested(tb, TCA_HTB_INIT, opt) || + tb[TCA_HTB_INIT-1] == NULL || + RTA_PAYLOAD(tb[TCA_HTB_INIT-1]) < sizeof(*gopt)) { + printk(KERN_ERR "HTB: hey probably you have bad tc tool ?\n"); + return -EINVAL; + } + gopt = RTA_DATA(tb[TCA_HTB_INIT-1]); + if (gopt->version != HTB_VER >> 16) { + printk(KERN_ERR "HTB: need tc/htb version %d (minor is %d), you have %d\n", + HTB_VER >> 16,HTB_VER & 0xffff,gopt->version); + return -EINVAL; + } + q->debug = gopt->debug; + HTB_DBG(0,1,"htb_init sch=%p handle=%X r2q=%d\n",sch,sch->handle,gopt->rate2quantum); + + INIT_LIST_HEAD(&q->root); + for (i = 0; i < HTB_HSIZE; i++) + INIT_LIST_HEAD(q->hash+i); + for (i = 0; i < TC_HTB_NUMPRIO; i++) + INIT_LIST_HEAD(q->drops+i); + + init_timer(&q->timer); + skb_queue_head_init(&q->direct_queue); + + q->direct_qlen = sch->dev->tx_queue_len; + if (q->direct_qlen < 2) /* some devices have zero tx_queue_len */ + q->direct_qlen = 2; + q->timer.function = htb_timer; + q->timer.data = (unsigned long)sch; + +#ifdef HTB_RATECM + init_timer(&q->rttim); + q->rttim.function = htb_rate_timer; + q->rttim.data = (unsigned long)sch; + q->rttim.expires = jiffies + HZ; + add_timer(&q->rttim); +#endif + if ((q->rate2quantum = gopt->rate2quantum) < 1) + q->rate2quantum = 1; + q->defcls = gopt->defcls; + + return 0; +} + +static int htb_dump(struct Qdisc *sch, struct sk_buff *skb) +{ + struct htb_sched *q = qdisc_priv(sch); + unsigned char *b = skb->tail; + struct rtattr *rta; + struct tc_htb_glob gopt; + HTB_DBG(0,1,"htb_dump sch=%p, handle=%X\n",sch,sch->handle); + HTB_QLOCK(sch); + gopt.direct_pkts = q->direct_pkts; + +#ifdef HTB_DEBUG + if (HTB_DBG_COND(0,2)) + htb_debug_dump(q); +#endif + gopt.version = HTB_VER; + gopt.rate2quantum = q->rate2quantum; + gopt.defcls = q->defcls; + gopt.debug = q->debug; + rta = (struct rtattr*)b; + RTA_PUT(skb, TCA_OPTIONS, 0, NULL); + RTA_PUT(skb, TCA_HTB_INIT, sizeof(gopt), &gopt); + rta->rta_len = skb->tail - b; + HTB_QUNLOCK(sch); + return skb->len; +rtattr_failure: + HTB_QUNLOCK(sch); + skb_trim(skb, skb->tail - skb->data); + return -1; +} + +static int htb_dump_class(struct Qdisc *sch, unsigned long arg, + struct sk_buff *skb, struct tcmsg *tcm) +{ +#ifdef HTB_DEBUG + struct htb_sched *q = qdisc_priv(sch); +#endif + struct htb_class *cl = (struct htb_class*)arg; + unsigned char *b = skb->tail; + struct rtattr *rta; + struct tc_htb_opt opt; + + HTB_DBG(0,1,"htb_dump_class handle=%X clid=%X\n",sch->handle,cl->classid); + + HTB_QLOCK(sch); + tcm->tcm_parent = cl->parent ? cl->parent->classid : TC_H_ROOT; + tcm->tcm_handle = cl->classid; + if (!cl->level && cl->un.leaf.q) + tcm->tcm_info = cl->un.leaf.q->handle; + + rta = (struct rtattr*)b; + RTA_PUT(skb, TCA_OPTIONS, 0, NULL); + + memset (&opt,0,sizeof(opt)); + + opt.rate = cl->rate->rate; opt.buffer = cl->buffer; + opt.ceil = cl->ceil->rate; opt.cbuffer = cl->cbuffer; + opt.quantum = cl->un.leaf.quantum; opt.prio = cl->un.leaf.prio; + opt.level = cl->level; + RTA_PUT(skb, TCA_HTB_PARMS, sizeof(opt), &opt); + rta->rta_len = skb->tail - b; + HTB_QUNLOCK(sch); + return skb->len; +rtattr_failure: + HTB_QUNLOCK(sch); + skb_trim(skb, b - skb->data); + return -1; +} + +static int +htb_dump_class_stats(struct Qdisc *sch, unsigned long arg, + struct gnet_dump *d) +{ + struct htb_class *cl = (struct htb_class*)arg; + +#ifdef HTB_RATECM + cl->rate_est.bps = cl->rate_bytes/(HTB_EWMAC*HTB_HSIZE); + cl->rate_est.pps = cl->rate_packets/(HTB_EWMAC*HTB_HSIZE); +#endif + + if (!cl->level && cl->un.leaf.q) + cl->qstats.qlen = cl->un.leaf.q->q.qlen; + cl->xstats.tokens = cl->tokens; + cl->xstats.ctokens = cl->ctokens; + + 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 htb_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, + struct Qdisc **old) +{ + struct htb_class *cl = (struct htb_class*)arg; + + if (cl && !cl->level) { + if (new == NULL && (new = qdisc_create_dflt(sch->dev, + &pfifo_qdisc_ops)) == NULL) + return -ENOBUFS; + sch_tree_lock(sch); + if ((*old = xchg(&cl->un.leaf.q, new)) != NULL) { + if (cl->prio_activity) + htb_deactivate (qdisc_priv(sch),cl); + + /* TODO: is it correct ? Why CBQ doesn't do it ? */ + sch->q.qlen -= (*old)->q.qlen; + qdisc_reset(*old); + } + sch_tree_unlock(sch); + return 0; + } + return -ENOENT; +} + +static struct Qdisc * htb_leaf(struct Qdisc *sch, unsigned long arg) +{ + struct htb_class *cl = (struct htb_class*)arg; + return (cl && !cl->level) ? cl->un.leaf.q : NULL; +} + +static unsigned long htb_get(struct Qdisc *sch, u32 classid) +{ +#ifdef HTB_DEBUG + struct htb_sched *q = qdisc_priv(sch); +#endif + struct htb_class *cl = htb_find(classid,sch); + HTB_DBG(0,1,"htb_get clid=%X q=%p cl=%p ref=%d\n",classid,q,cl,cl?cl->refcnt:0); + if (cl) + cl->refcnt++; + return (unsigned long)cl; +} + +static void htb_destroy_filters(struct tcf_proto **fl) +{ + struct tcf_proto *tp; + + while ((tp = *fl) != NULL) { + *fl = tp->next; + tcf_destroy(tp); + } +} + +static void htb_destroy_class(struct Qdisc* sch,struct htb_class *cl) +{ + struct htb_sched *q = qdisc_priv(sch); + HTB_DBG(0,1,"htb_destrycls clid=%X ref=%d\n", cl?cl->classid:0,cl?cl->refcnt:0); + if (!cl->level) { + BUG_TRAP(cl->un.leaf.q); + sch->q.qlen -= cl->un.leaf.q->q.qlen; + qdisc_destroy(cl->un.leaf.q); + } + qdisc_put_rtab(cl->rate); + qdisc_put_rtab(cl->ceil); + + htb_destroy_filters (&cl->filter_list); + + while (!list_empty(&cl->children)) + htb_destroy_class (sch,list_entry(cl->children.next, + struct htb_class,sibling)); + + /* note: this delete may happen twice (see htb_delete) */ + list_del(&cl->hlist); + list_del(&cl->sibling); + + if (cl->prio_activity) + htb_deactivate (q,cl); + + if (cl->cmode != HTB_CAN_SEND) + htb_safe_rb_erase(&cl->pq_node,q->wait_pq+cl->level); + + kfree(cl); +} + +/* always caled under BH & queue lock */ +static void htb_destroy(struct Qdisc* sch) +{ + struct htb_sched *q = qdisc_priv(sch); + HTB_DBG(0,1,"htb_destroy q=%p\n",q); + + del_timer_sync (&q->timer); +#ifdef HTB_RATECM + del_timer_sync (&q->rttim); +#endif + /* This line used to be after htb_destroy_class call below + and surprisingly it worked in 2.4. But it must precede it + because filter need its target class alive to be able to call + unbind_filter on it (without Oops). */ + htb_destroy_filters(&q->filter_list); + + while (!list_empty(&q->root)) + htb_destroy_class (sch,list_entry(q->root.next, + struct htb_class,sibling)); + + __skb_queue_purge(&q->direct_queue); +} + +static int htb_delete(struct Qdisc *sch, unsigned long arg) +{ + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl = (struct htb_class*)arg; + HTB_DBG(0,1,"htb_delete q=%p cl=%X ref=%d\n",q,cl?cl->classid:0,cl?cl->refcnt:0); + + // TODO: why don't allow to delete subtree ? references ? does + // tc subsys quarantee us that in htb_destroy it holds no class + // refs so that we can remove children safely there ? + if (!list_empty(&cl->children) || cl->filter_cnt) + return -EBUSY; + + sch_tree_lock(sch); + + /* delete from hash and active; remainder in destroy_class */ + list_del_init(&cl->hlist); + if (cl->prio_activity) + htb_deactivate (q,cl); + + if (--cl->refcnt == 0) + htb_destroy_class(sch,cl); + + sch_tree_unlock(sch); + return 0; +} + +static void htb_put(struct Qdisc *sch, unsigned long arg) +{ +#ifdef HTB_DEBUG + struct htb_sched *q = qdisc_priv(sch); +#endif + struct htb_class *cl = (struct htb_class*)arg; + HTB_DBG(0,1,"htb_put q=%p cl=%X ref=%d\n",q,cl?cl->classid:0,cl?cl->refcnt:0); + + if (--cl->refcnt == 0) + htb_destroy_class(sch,cl); +} + +static int htb_change_class(struct Qdisc *sch, u32 classid, + u32 parentid, struct rtattr **tca, unsigned long *arg) +{ + int err = -EINVAL; + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl = (struct htb_class*)*arg,*parent; + struct rtattr *opt = tca[TCA_OPTIONS-1]; + struct qdisc_rate_table *rtab = NULL, *ctab = NULL; + struct rtattr *tb[TCA_HTB_RTAB]; + struct tc_htb_opt *hopt; + + /* extract all subattrs from opt attr */ + if (!opt || rtattr_parse_nested(tb, TCA_HTB_RTAB, opt) || + tb[TCA_HTB_PARMS-1] == NULL || + RTA_PAYLOAD(tb[TCA_HTB_PARMS-1]) < sizeof(*hopt)) + goto failure; + + parent = parentid == TC_H_ROOT ? NULL : htb_find (parentid,sch); + + hopt = RTA_DATA(tb[TCA_HTB_PARMS-1]); + HTB_DBG(0,1,"htb_chg cl=%p(%X), clid=%X, parid=%X, opt/prio=%d, rate=%u, buff=%d, quant=%d\n", cl,cl?cl->classid:0,classid,parentid,(int)hopt->prio,hopt->rate.rate,hopt->buffer,hopt->quantum); + rtab = qdisc_get_rtab(&hopt->rate, tb[TCA_HTB_RTAB-1]); + ctab = qdisc_get_rtab(&hopt->ceil, tb[TCA_HTB_CTAB-1]); + if (!rtab || !ctab) goto failure; + + if (!cl) { /* new class */ + struct Qdisc *new_q; + /* check for valid classid */ + if (!classid || TC_H_MAJ(classid^sch->handle) || htb_find(classid,sch)) + goto failure; + + /* check maximal depth */ + if (parent && parent->parent && parent->parent->level < 2) { + printk(KERN_ERR "htb: tree is too deep\n"); + goto failure; + } + err = -ENOBUFS; + if ((cl = kmalloc(sizeof(*cl), GFP_KERNEL)) == NULL) + goto failure; + + memset(cl, 0, sizeof(*cl)); + cl->refcnt = 1; + INIT_LIST_HEAD(&cl->sibling); + INIT_LIST_HEAD(&cl->hlist); + INIT_LIST_HEAD(&cl->children); + INIT_LIST_HEAD(&cl->un.leaf.drop_list); +#ifdef HTB_DEBUG + cl->magic = HTB_CMAGIC; +#endif + + /* create leaf qdisc early because it uses kmalloc(GFP_KERNEL) + so that can't be used inside of sch_tree_lock + -- thanks to Karlis Peisenieks */ + new_q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops); + sch_tree_lock(sch); + if (parent && !parent->level) { + /* turn parent into inner node */ + sch->q.qlen -= parent->un.leaf.q->q.qlen; + qdisc_destroy (parent->un.leaf.q); + if (parent->prio_activity) + htb_deactivate (q,parent); + + /* remove from evt list because of level change */ + if (parent->cmode != HTB_CAN_SEND) { + htb_safe_rb_erase(&parent->pq_node,q->wait_pq /*+0*/); + parent->cmode = HTB_CAN_SEND; + } + parent->level = (parent->parent ? parent->parent->level + : TC_HTB_MAXDEPTH) - 1; + memset (&parent->un.inner,0,sizeof(parent->un.inner)); + } + /* leaf (we) needs elementary qdisc */ + cl->un.leaf.q = new_q ? new_q : &noop_qdisc; + + cl->classid = classid; cl->parent = parent; + + /* set class to be in HTB_CAN_SEND state */ + cl->tokens = hopt->buffer; + cl->ctokens = hopt->cbuffer; + cl->mbuffer = 60000000; /* 1min */ + PSCHED_GET_TIME(cl->t_c); + cl->cmode = HTB_CAN_SEND; + + /* attach to the hash list and parent's family */ + list_add_tail(&cl->hlist, q->hash+htb_hash(classid)); + list_add_tail(&cl->sibling, parent ? &parent->children : &q->root); +#ifdef HTB_DEBUG + { + int i; + for (i = 0; i < TC_HTB_NUMPRIO; i++) cl->node[i].rb_color = -1; + cl->pq_node.rb_color = -1; + } +#endif + } else sch_tree_lock(sch); + + /* it used to be a nasty bug here, we have to check that node + is really leaf before changing cl->un.leaf ! */ + if (!cl->level) { + cl->un.leaf.quantum = rtab->rate.rate / q->rate2quantum; + if (!hopt->quantum && cl->un.leaf.quantum < 1000) { + printk(KERN_WARNING "HTB: quantum of class %X is small. Consider r2q change.\n", cl->classid); + cl->un.leaf.quantum = 1000; + } + if (!hopt->quantum && cl->un.leaf.quantum > 200000) { + printk(KERN_WARNING "HTB: quantum of class %X is big. Consider r2q change.\n", cl->classid); + cl->un.leaf.quantum = 200000; + } + if (hopt->quantum) + cl->un.leaf.quantum = hopt->quantum; + if ((cl->un.leaf.prio = hopt->prio) >= TC_HTB_NUMPRIO) + cl->un.leaf.prio = TC_HTB_NUMPRIO - 1; + } + + cl->buffer = hopt->buffer; + cl->cbuffer = hopt->cbuffer; + if (cl->rate) qdisc_put_rtab(cl->rate); cl->rate = rtab; + if (cl->ceil) qdisc_put_rtab(cl->ceil); cl->ceil = ctab; + sch_tree_unlock(sch); + + *arg = (unsigned long)cl; + return 0; + +failure: + if (rtab) qdisc_put_rtab(rtab); + if (ctab) qdisc_put_rtab(ctab); + return err; +} + +static struct tcf_proto **htb_find_tcf(struct Qdisc *sch, unsigned long arg) +{ + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl = (struct htb_class *)arg; + struct tcf_proto **fl = cl ? &cl->filter_list : &q->filter_list; + HTB_DBG(0,2,"htb_tcf q=%p clid=%X fref=%d fl=%p\n",q,cl?cl->classid:0,cl?cl->filter_cnt:q->filter_cnt,*fl); + return fl; +} + +static unsigned long htb_bind_filter(struct Qdisc *sch, unsigned long parent, + u32 classid) +{ + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl = htb_find (classid,sch); + HTB_DBG(0,2,"htb_bind q=%p clid=%X cl=%p fref=%d\n",q,classid,cl,cl?cl->filter_cnt:q->filter_cnt); + /*if (cl && !cl->level) return 0; + The line above used to be there to prevent attaching filters to + leaves. But at least tc_index filter uses this just to get class + for other reasons so that we have to allow for it. + ---- + 19.6.2002 As Werner explained it is ok - bind filter is just + another way to "lock" the class - unlike "get" this lock can + be broken by class during destroy IIUC. + */ + if (cl) + cl->filter_cnt++; + else + q->filter_cnt++; + return (unsigned long)cl; +} + +static void htb_unbind_filter(struct Qdisc *sch, unsigned long arg) +{ + struct htb_sched *q = qdisc_priv(sch); + struct htb_class *cl = (struct htb_class *)arg; + HTB_DBG(0,2,"htb_unbind q=%p cl=%p fref=%d\n",q,cl,cl?cl->filter_cnt:q->filter_cnt); + if (cl) + cl->filter_cnt--; + else + q->filter_cnt--; +} + +static void htb_walk(struct Qdisc *sch, struct qdisc_walker *arg) +{ + struct htb_sched *q = qdisc_priv(sch); + int i; + + if (arg->stop) + return; + + for (i = 0; i < HTB_HSIZE; i++) { + struct list_head *p; + list_for_each (p,q->hash+i) { + struct htb_class *cl = list_entry(p,struct htb_class,hlist); + 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 htb_class_ops = { + .graft = htb_graft, + .leaf = htb_leaf, + .get = htb_get, + .put = htb_put, + .change = htb_change_class, + .delete = htb_delete, + .walk = htb_walk, + .tcf_chain = htb_find_tcf, + .bind_tcf = htb_bind_filter, + .unbind_tcf = htb_unbind_filter, + .dump = htb_dump_class, + .dump_stats = htb_dump_class_stats, +}; + +static struct Qdisc_ops htb_qdisc_ops = { + .next = NULL, + .cl_ops = &htb_class_ops, + .id = "htb", + .priv_size = sizeof(struct htb_sched), + .enqueue = htb_enqueue, + .dequeue = htb_dequeue, + .requeue = htb_requeue, + .drop = htb_drop, + .init = htb_init, + .reset = htb_reset, + .destroy = htb_destroy, + .change = NULL /* htb_change */, + .dump = htb_dump, + .owner = THIS_MODULE, +}; + +static int __init htb_module_init(void) +{ + return register_qdisc(&htb_qdisc_ops); +} +static void __exit htb_module_exit(void) +{ + unregister_qdisc(&htb_qdisc_ops); +} +module_init(htb_module_init) +module_exit(htb_module_exit) +MODULE_LICENSE("GPL"); |
