patch-2.4.20 linux-2.4.20/net/sched/sch_htb.c
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- Lines: 1661
- Date:
Thu Nov 28 15:53:16 2002
- Orig file:
linux-2.4.19/net/sched/sch_htb.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/net/sched/sch_htb.c linux-2.4.20/net/sched/sch_htb.c
@@ -0,0 +1,1660 @@
+/* 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=%lu\n",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=%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)
+{
+ rb_node_t **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
+ 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=%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)
+ 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=%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)) < (
+#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=%X\n",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=%p\n",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=%p\n",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=%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 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=%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, 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=%lu\n",
+ 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=%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->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=%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;
+ 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=%ld\n",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=%lu\n",
+ 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=%d\n",
+ 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=%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);
+ 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 > 5sec\n", 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=%ld\n",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=%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;
+ }
+
+ 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=%p\n",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=%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 = (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.%d\n",
+ 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 %d\n",
+ 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=%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;
+
+ 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=%X\n",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=%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;
+ 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=%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;
+ 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=%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);
+
+#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=%p\n",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=%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 = (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=%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 = (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=%d\n", 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 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
+
+ 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=%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 = (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=%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 = (struct htb_sched *)sch->data;
+ 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 = (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
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)