sch_htb.c
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- /* 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:
- * 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
- * and many others. thanks.
- *
- * $Id: sch_htb.c,v 1.14 2002/09/28 12:55:22 devik Exp devik $
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #include <asm/bitops.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/version.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 */
- #define HTB_DEBUG 1 /* 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 0x30007 /* 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
- /* temporary debug defines to be removed after beta stage */
- #define DEVIK_MEND(N)
- #define DEVIK_MSTART(N)
- /* 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(S,L,FMT,ARG...) if (((q->debug>>(2*S))&3) >= 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
- #define __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(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 tc_stats stats; /* generic stats */
- 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 {
- rb_root_t feed[TC_HTB_NUMPRIO]; /* feed trees */
- rb_node_t *ptr[TC_HTB_NUMPRIO]; /* current class ptr */
- } inner;
- } un;
- rb_node_t node[TC_HTB_NUMPRIO]; /* node for self or feed tree */
- rb_node_t 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 */
- rb_root_t row[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO];
- int row_mask[TC_HTB_MAXDEPTH];
- rb_node_t *ptr[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO];
- /* self wait list - roots of wait PQs per row */
- rb_root_t wait_pq[TC_HTB_MAXDEPTH];
- /* time of nearest event per level (row) */
- unsigned long near_ev_cache[TC_HTB_MAXDEPTH];
- /* 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 = (struct htb_sched *)sch->data;
- 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 struct htb_class *htb_classify(struct sk_buff *skb, struct Qdisc *sch)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- 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)
- return cl;
- tcf = q->filter_list;
- while (tcf && (result = tc_classify(skb, tcf, &res)) >= 0) {
- #ifdef CONFIG_NET_CLS_POLICE
- if (result == TC_POLICE_SHOT)
- return NULL;
- #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(rb_node_t **n);
- #define HTB_DUMTREE(root,memb) if(root) {
- rb_node_t *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=%lun",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, 0);
- 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 rb_root_t *root,
- struct htb_class *cl,int prio)
- {
- rb_node_t **p = &root->rb_node, *parent = NULL;
- HTB_DBG(7,3,"htb_add_id_tree cl=%X prio=%dn",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)
- {
- rb_node_t **p = &q->wait_pq[cl->level].rb_node, *parent = NULL;
- HTB_DBG(7,3,"htb_add_wt cl=%X key=%lun",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=%dn",delay,cl->classid,debug_hint);
- #endif
- DEVIK_MSTART(9);
- cl->pq_key = jiffies + PSCHED_US2JIFFIE(delay);
- if (cl->pq_key == jiffies)
- cl->pq_key++;
- /* update the nearest event cache */
- if (q->near_ev_cache[cl->level] - cl->pq_key < 0x80000000)
- 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 (cl->pq_key - c->pq_key < 0x80000000)
- 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]);
- DEVIK_MEND(9);
- }
- /**
- * 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(rb_node_t **n)
- {
- rb_node_t *p;
- if ((*n)->rb_right) {
- *n = (*n)->rb_right;
- while ((*n)->rb_left)
- *n = (*n)->rb_left;
- return;
- }
- while ((p = (*n)->rb_parent) != NULL) {
- if (p->rb_left == *n) break;
- *n = p;
- }
- *n = p;
- }
- /**
- * 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=%Xn",
- 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=%Xn",
- 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=%dn",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=%dn",
- 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=%dn",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)
- htb_next_rb_node(p->un.inner.ptr + prio);
-
- 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=%dn",
- 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)) < (
- #ifdef HTB_HYSTERESIS
- cl->cmode != HTB_CANT_SEND ? -cl->cbuffer :
- #endif
- 0)) {
- *diff = -toks;
- return HTB_CANT_SEND;
- }
- if ((toks = (cl->tokens + *diff)) >= (
- #ifdef 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=%Xn",cl->cmode,new_mode,cl->classid);
- if (new_mode == cl->cmode)
- return;
-
- if (cl->prio_activity) { /* not neccessary: 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)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- struct htb_class *cl = htb_classify(skb,sch);
- DEVIK_MSTART(0);
- if (cl == HTB_DIRECT || !cl) {
- /* enqueue to helper queue */
- if (q->direct_queue.qlen < q->direct_qlen && cl) {
- __skb_queue_tail(&q->direct_queue, skb);
- q->direct_pkts++;
- } else {
- kfree_skb (skb);
- sch->stats.drops++;
- DEVIK_MEND(0);
- return NET_XMIT_DROP;
- }
- } else if (cl->un.leaf.q->enqueue(skb, cl->un.leaf.q) != NET_XMIT_SUCCESS) {
- sch->stats.drops++;
- cl->stats.drops++;
- DEVIK_MEND(0);
- return NET_XMIT_DROP;
- } else {
- cl->stats.packets++; cl->stats.bytes += skb->len;
- DEVIK_MSTART(1);
- htb_activate (q,cl);
- DEVIK_MEND(1);
- }
- sch->q.qlen++;
- sch->stats.packets++; sch->stats.bytes += skb->len;
- HTB_DBG(1,1,"htb_enq_ok cl=%X skb=%pn",cl?cl->classid:0,skb);
- DEVIK_MEND(0);
- 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 = (struct htb_sched *)sch->data;
- struct htb_class *cl = htb_classify(skb,sch);
- if (cl == HTB_DIRECT || !cl) {
- /* enqueue to helper queue */
- if (q->direct_queue.qlen < q->direct_qlen && cl) {
- __skb_queue_tail(&q->direct_queue, skb);
- q->direct_pkts++;
- } else {
- kfree_skb (skb);
- sch->stats.drops++;
- return NET_XMIT_DROP;
- }
- } else if (cl->un.leaf.q->ops->requeue(skb, cl->un.leaf.q) != NET_XMIT_SUCCESS) {
- sch->stats.drops++;
- cl->stats.drops++;
- return NET_XMIT_DROP;
- } else
- htb_activate (q,cl);
- sch->q.qlen++;
- HTB_DBG(1,1,"htb_req_ok cl=%X skb=%pn",cl?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 = (struct htb_sched *)sch->data;
- struct list_head *p;
- /* lock queue so that we can muck with it */
- HTB_QLOCK(sch);
- HTB_DBG(10,1,"htb_rttmr j=%ldn",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=%lun",
- 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 ammount "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=%dn",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, 0);
- #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=%lun",
- cl->classid, diff,
- (unsigned long long) q->now,
- (unsigned long long) cl->t_c,
- 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=%ldn",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->stats.bytes += bytes;
- cl->stats.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).
- */
- 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=%Xn",
- level,q->wait_pq[level].rb_node,q->row_mask[level]);
- for (i = 0; i < 500; i++) {
- struct htb_class *cl;
- long diff;
- rb_node_t *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 (cl->pq_key - (jiffies+1) < 0x80000000) {
- HTB_DBG(8,3,"htb_do_ev_ret delay=%ldn",cl->pq_key - jiffies);
- return cl->pq_key - jiffies;
- }
- htb_safe_rb_erase(p,q->wait_pq+level);
- diff = PSCHED_TDIFF_SAFE(q->now, cl->t_c, (u32)cl->mbuffer, 0);
- #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=%lun",
- cl->classid, diff,
- (unsigned long long) q->now,
- (unsigned long long) cl->t_c,
- 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;
- }
- /**
- * 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(rb_root_t *tree,int prio,rb_node_t **pptr)
- {
- int i;
- struct {
- rb_node_t *root;
- rb_node_t **pptr;
- } stk[TC_HTB_MAXDEPTH],*sp = stk;
-
- sp->root = tree->rb_node;
- sp->pptr = pptr;
- for (i = 0; i < 65535; i++) {
- 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;
- }
- }
- 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_sched *q = (struct htb_sched *)sch->data;
- struct htb_class *cl,*start;
- /* look initial class up in the row */
- DEVIK_MSTART(6);
- start = cl = htb_lookup_leaf (q->row[level]+prio,prio,q->ptr[level]+prio);
-
- do {
- BUG_TRAP(cl && cl->un.leaf.q->q.qlen); if (!cl) return NULL;
- HTB_DBG(4,1,"htb_deq_tr prio=%d lev=%d cl=%X defic=%dn",
- prio,level,cl->classid,cl->un.leaf.deficit[level]);
-
- 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 (q->row[level]+prio,prio,q->ptr[level]+prio);
- } while (cl != start);
- DEVIK_MEND(6);
- DEVIK_MSTART(7);
- if (likely(skb != NULL)) {
- if ((cl->un.leaf.deficit[level] -= skb->len) < 0) {
- HTB_DBG(4,2,"htb_next_cl oldptr=%p quant_add=%dn",
- 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);
- DEVIK_MSTART(8);
- htb_charge_class (q,cl,level,skb->len);
- DEVIK_MEND(8);
- }
- DEVIK_MEND(7);
- return skb;
- }
- static void htb_delay_by(struct Qdisc *sch,long delay)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- if (netif_queue_stopped(sch->dev)) return;
- if (delay <= 0) delay = 1;
- if (unlikely(delay > 5*HZ)) {
- if (net_ratelimit())
- printk(KERN_INFO "HTB delay %ld > 5secn", delay);
- delay = 5*HZ;
- }
- del_timer(&q->timer);
- q->timer.expires = jiffies + delay;
- add_timer(&q->timer);
- sch->flags |= TCQ_F_THROTTLED;
- sch->stats.overlimits++;
- HTB_DBG(3,1,"htb_deq t_delay=%ldn",delay);
- }
- static struct sk_buff *htb_dequeue(struct Qdisc *sch)
- {
- struct sk_buff *skb = NULL;
- struct htb_sched *q = (struct htb_sched *)sch->data;
- int level;
- long min_delay;
- HTB_DBG(3,1,"htb_deq dircnt=%d qlen=%dn",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;
- }
- DEVIK_MSTART(2);
- if (!sch->q.qlen) goto fin;
- PSCHED_GET_TIME(q->now);
- min_delay = HZ*5;
- q->nwc_hit = 0;
- for (level = 0; level < TC_HTB_MAXDEPTH; level++) {
- /* common case optimization - skip event handler quickly */
- int m;
- long delay;
- DEVIK_MSTART(3);
- if (jiffies - q->near_ev_cache[level] < 0x80000000 || 0) {
- delay = htb_do_events(q,level);
- q->near_ev_cache[level] += delay ? delay : HZ;
- } else
- delay = q->near_ev_cache[level] - jiffies;
-
- if (delay && min_delay > delay)
- min_delay = delay;
- DEVIK_MEND(3);
- DEVIK_MSTART(5);
- 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;
- DEVIK_MEND(5);
- goto fin;
- }
- }
- DEVIK_MEND(5);
- }
- DEVIK_MSTART(4);
- #ifdef HTB_DEBUG
- if (!q->nwc_hit && min_delay >= 5*HZ && net_ratelimit()) {
- printk(KERN_ERR "HTB: mindelay=%ld, report it please !n",min_delay);
- htb_debug_dump(q);
- }
- #endif
- htb_delay_by (sch,min_delay);
- DEVIK_MEND(4);
- fin:
- HTB_DBG(3,1,"htb_deq_end %s j=%lu skb=%pn",sch->dev->name,jiffies,skb);
- DEVIK_MEND(2);
- return skb;
- }
- /* try to drop from each class (by prio) until one succeed */
- static int htb_drop(struct Qdisc* sch)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- 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);
- if (cl->un.leaf.q->ops->drop &&
- 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 1;
- }
- }
- }
- return 0;
- }
- /* reset all classes */
- /* always caled under BH & queue lock */
- static void htb_reset(struct Qdisc* sch)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- int i;
- HTB_DBG(0,1,"htb_reset sch=%p, handle=%Xn",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 = (struct htb_sched*)sch->data;
- 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.%dn",
- HTB_VER >> 16,HTB_VER & 0xffff);
- #endif
- if (!opt || rtattr_parse(tb, TCA_HTB_INIT, RTA_DATA(opt), RTA_PAYLOAD(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 %dn",
- HTB_VER >> 16,HTB_VER & 0xffff,gopt->version);
- return -EINVAL;
- }
- memset(q,0,sizeof(*q));
- q->debug = gopt->debug;
- HTB_DBG(0,1,"htb_init sch=%p handle=%X r2q=%dn",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;
- MOD_INC_USE_COUNT;
- return 0;
- }
- static int htb_dump(struct Qdisc *sch, struct sk_buff *skb)
- {
- struct htb_sched *q = (struct htb_sched*)sch->data;
- unsigned char *b = skb->tail;
- struct rtattr *rta;
- struct tc_htb_glob gopt;
- HTB_DBG(0,1,"htb_dump sch=%p, handle=%Xn",sch,sch->handle);
- /* stats */
- HTB_QLOCK(sch);
- gopt.direct_pkts = q->direct_pkts;
- #ifdef HTB_DEBUG
- 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;
- sch->stats.qlen = sch->q.qlen;
- RTA_PUT(skb, TCA_STATS, sizeof(sch->stats), &sch->stats);
- 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 = (struct htb_sched*)sch->data;
- #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=%Xn",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;
- cl->stats.qlen = cl->un.leaf.q->q.qlen;
- }
- 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;
- #ifdef HTB_RATECM
- cl->stats.bps = cl->rate_bytes/(HTB_EWMAC*HTB_HSIZE);
- cl->stats.pps = cl->rate_packets/(HTB_EWMAC*HTB_HSIZE);
- #endif
- cl->xstats.tokens = cl->tokens;
- cl->xstats.ctokens = cl->ctokens;
- RTA_PUT(skb, TCA_STATS, sizeof(cl->stats), &cl->stats);
- RTA_PUT(skb, TCA_XSTATS, sizeof(cl->xstats), &cl->xstats);
- HTB_QUNLOCK(sch);
- return skb->len;
- rtattr_failure:
- HTB_QUNLOCK(sch);
- skb_trim(skb, b - skb->data);
- return -1;
- }
- 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) {
- /* 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 = (struct htb_sched *)sch->data;
- #endif
- struct htb_class *cl = htb_find(classid,sch);
- HTB_DBG(0,1,"htb_get clid=%X q=%p cl=%p ref=%dn",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;
- tp->ops->destroy(tp);
- }
- }
- static void htb_destroy_class(struct Qdisc* sch,struct htb_class *cl)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- HTB_DBG(0,1,"htb_destrycls clid=%X ref=%dn", 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);
-
- #ifdef CONFIG_NET_ESTIMATOR
- qdisc_kill_estimator(&cl->stats);
- #endif
- 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 = (struct htb_sched *)sch->data;
- HTB_DBG(0,1,"htb_destroy q=%pn",q);
- del_timer_sync (&q->timer);
- #ifdef HTB_RATECM
- del_timer_sync (&q->rttim);
- #endif
- while (!list_empty(&q->root))
- htb_destroy_class (sch,list_entry(q->root.next,
- struct htb_class,sibling));
- htb_destroy_filters(&q->filter_list);
- __skb_queue_purge(&q->direct_queue);
- MOD_DEC_USE_COUNT;
- }
- static int htb_delete(struct Qdisc *sch, unsigned long arg)
- {
- struct htb_sched *q = (struct htb_sched *)sch->data;
- struct htb_class *cl = (struct htb_class*)arg;
- HTB_DBG(0,1,"htb_delete q=%p cl=%X ref=%dn",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 = (struct htb_sched *)sch->data;
- #endif
- struct htb_class *cl = (struct htb_class*)arg;
- HTB_DBG(0,1,"htb_put q=%p cl=%X ref=%dn",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 = (struct htb_sched *)sch->data;
- 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(tb, TCA_HTB_RTAB, RTA_DATA(opt), RTA_PAYLOAD(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, clid=%X, opt/prio=%d, rate=%u, buff=%d, quant=%dn", cl,cl?cl->classid:0,(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 */
- /* 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 deepn");
- 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
- 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 */
- if (!(cl->un.leaf.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
- cl->un.leaf.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.", 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.", 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 = (struct htb_sched *)sch->data;
- 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=%pn",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 = (struct htb_sched *)sch->data;
- struct htb_class *cl = htb_find (classid,sch);
- HTB_DBG(0,2,"htb_bind q=%p clid=%X cl=%p fref=%dn",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 = (struct htb_sched *)sch->data;
- struct htb_class *cl = (struct htb_class *)arg;
- HTB_DBG(0,2,"htb_unbind q=%p cl=%p fref=%dn",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 = (struct htb_sched *)sch->data;
- 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 =
- {
- htb_graft,
- htb_leaf,
- htb_get,
- htb_put,
- htb_change_class,
- htb_delete,
- htb_walk,
- htb_find_tcf,
- htb_bind_filter,
- htb_unbind_filter,
- htb_dump_class,
- };
- struct Qdisc_ops htb_qdisc_ops =
- {
- NULL,
- &htb_class_ops,
- "htb",
- sizeof(struct htb_sched),
- htb_enqueue,
- htb_dequeue,
- htb_requeue,
- htb_drop,
- htb_init,
- htb_reset,
- htb_destroy,
- NULL /* htb_change */,
- htb_dump,
- };
- #ifdef MODULE
- int init_module(void)
- {
- return register_qdisc(&htb_qdisc_ops);
- }
- void cleanup_module(void)
- {
- unregister_qdisc(&htb_qdisc_ops);
- }
- MODULE_LICENSE("GPL");
- #endif