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[HTB]: Use hlist for hash lists. 

Use hlist instead of list for the hash list. This saves
space, and we can check for double delete better.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-08-10 23:35:38 -07:00 committed by David S. Miller
parent 87990467d3
commit 0cef296da9
1 changed files with 27 additions and 22 deletions
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49
net/sched/sch_htb.c
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@ -104,7 +104,7 @@ struct htb_class {
/* topology */
int level; /* our level (see above) */
struct htb_class *parent; /* parent class */
struct list_head hlist; /* classid hash list item */
struct hlist_node hlist; /* classid hash list item */
struct list_head sibling; /* sibling list item */
struct list_head children; /* children list */
@ -163,8 +163,8 @@ static inline long L2T(struct htb_class *cl, struct qdisc_rate_table *rate,
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) */
struct hlist_head hash[HTB_HSIZE]; /* hashed by classid */
struct list_head drops[TC_HTB_NUMPRIO];/* active leaves (for drops) */
/* self list - roots of self generating tree */
struct rb_root row[TC_HTB_MAXDEPTH][TC_HTB_NUMPRIO];
@ -220,12 +220,13 @@ static inline int htb_hash(u32 h)
static inline struct htb_class *htb_find(u32 handle, struct Qdisc *sch)
{
struct htb_sched *q = qdisc_priv(sch);
struct list_head *p;
struct hlist_node *p;
struct htb_class *cl;
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);
hlist_for_each_entry(cl, p, q->hash + htb_hash(handle), hlist) {
if (cl->classid == handle)
return cl;
}
@ -675,7 +676,9 @@ static void htb_rate_timer(unsigned long arg)
{
struct Qdisc *sch = (struct Qdisc *)arg;
struct htb_sched *q = qdisc_priv(sch);
struct list_head *p;
struct hlist_node *p;
struct htb_class *cl;
/* lock queue so that we can muck with it */
spin_lock_bh(&sch->dev->queue_lock);
@ -686,9 +689,8 @@ static void htb_rate_timer(unsigned long arg)
/* 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);
hlist_for_each_entry(cl,p, q->hash + q->recmp_bucket, hlist) {
RT_GEN(cl->sum_bytes, cl->rate_bytes);
RT_GEN(cl->sum_packets, cl->rate_packets);
}
@ -1041,10 +1043,10 @@ static void htb_reset(struct Qdisc *sch)
int i;
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);
struct hlist_node *p;
struct htb_class *cl;
hlist_for_each_entry(cl, p, q->hash + i, hlist) {
if (cl->level)
memset(&cl->un.inner, 0, sizeof(cl->un.inner));
else {
@ -1091,7 +1093,7 @@ static int htb_init(struct Qdisc *sch, struct rtattr *opt)
INIT_LIST_HEAD(&q->root);
for (i = 0; i < HTB_HSIZE; i++)
INIT_LIST_HEAD(q->hash + i);
INIT_HLIST_HEAD(q->hash + i);
for (i = 0; i < TC_HTB_NUMPRIO; i++)
INIT_LIST_HEAD(q->drops + i);
@ -1269,7 +1271,8 @@ static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
struct htb_class, sibling));
/* note: this delete may happen twice (see htb_delete) */
list_del(&cl->hlist);
if (!hlist_unhashed(&cl->hlist))
hlist_del(&cl->hlist);
list_del(&cl->sibling);
if (cl->prio_activity)
@ -1317,7 +1320,9 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
sch_tree_lock(sch);
/* delete from hash and active; remainder in destroy_class */
list_del_init(&cl->hlist);
if (!hlist_unhashed(&cl->hlist))
hlist_del(&cl->hlist);
if (cl->prio_activity)
htb_deactivate(q, cl);
@ -1381,7 +1386,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
cl->refcnt = 1;
INIT_LIST_HEAD(&cl->sibling);
INIT_LIST_HEAD(&cl->hlist);
INIT_HLIST_NODE(&cl->hlist);
INIT_LIST_HEAD(&cl->children);
INIT_LIST_HEAD(&cl->un.leaf.drop_list);
@ -1420,7 +1425,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
cl->cmode = HTB_CAN_SEND;
/* attach to the hash list and parent's family */
list_add_tail(&cl->hlist, q->hash + htb_hash(classid));
hlist_add_head(&cl->hlist, q->hash + htb_hash(classid));
list_add_tail(&cl->sibling,
parent ? &parent->children : &q->root);
} else
@ -1520,10 +1525,10 @@ static void htb_walk(struct Qdisc *sch, struct qdisc_walker *arg)
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);
struct hlist_node *p;
struct htb_class *cl;
hlist_for_each_entry(cl, p, q->hash + i, hlist) {
if (arg->count < arg->skip) {
arg->count++;
continue;