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sch_atm: Convert to use standard list_head facilities.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-07-18 19:52:55 -07:00
parent c1f19b51d1
commit 6accec76f6
1 changed files with 41 additions and 57 deletions
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98
net/sched/sch_atm.c
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@ -52,7 +52,7 @@ struct atm_flow_data {
int ref; /* reference count */
struct gnet_stats_basic_packed bstats;
struct gnet_stats_queue qstats;
struct atm_flow_data *next;
struct list_head list;
struct atm_flow_data *excess; /* flow for excess traffic;
NULL to set CLP instead */
int hdr_len;
@ -61,34 +61,23 @@ struct atm_flow_data {
struct atm_qdisc_data {
struct atm_flow_data link; /* unclassified skbs go here */
struct atm_flow_data *flows; /* NB: "link" is also on this
struct list_head flows; /* NB: "link" is also on this
list */
struct tasklet_struct task; /* dequeue tasklet */
};
/* ------------------------- Class/flow operations ------------------------- */
static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
{
struct atm_flow_data *walk;
pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
for (walk = qdisc->flows; walk; walk = walk->next)
if (walk == flow)
return 1;
pr_debug("find_flow: not found\n");
return 0;
}
static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
struct atm_flow_data *flow;
for (flow = p->flows; flow; flow = flow->next)
list_for_each_entry(flow, &p->flows, list) {
if (flow->classid == classid)
break;
return flow;
return flow;
}
return NULL;
}
static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
@ -99,7 +88,7 @@ static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
sch, p, flow, new, old);
if (!find_flow(p, flow))
if (list_empty(&flow->list))
return -EINVAL;
if (!new)
new = &noop_qdisc;
@ -146,20 +135,12 @@ static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
struct atm_flow_data *flow = (struct atm_flow_data *)cl;
struct atm_flow_data **prev;
pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
if (--flow->ref)
return;
pr_debug("atm_tc_put: destroying\n");
for (prev = &p->flows; *prev; prev = &(*prev)->next)
if (*prev == flow)
break;
if (!*prev) {
printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
return;
}
*prev = flow->next;
list_del_init(&flow->list);
pr_debug("atm_tc_put: qdisc %p\n", flow->q);
qdisc_destroy(flow->q);
tcf_destroy_chain(&flow->filter_list);
@ -274,7 +255,7 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
error = -EINVAL;
goto err_out;
}
if (find_flow(p, flow)) {
if (!list_empty(&flow->list)) {
error = -EEXIST;
goto err_out;
}
@ -313,8 +294,7 @@ static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
flow->classid = classid;
flow->ref = 1;
flow->excess = excess;
flow->next = p->link.next;
p->link.next = flow;
list_add(&flow->list, &p->link.list);
flow->hdr_len = hdr_len;
if (hdr)
memcpy(flow->hdr, hdr, hdr_len);
@ -335,7 +315,7 @@ static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
struct atm_flow_data *flow = (struct atm_flow_data *)arg;
pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
if (!find_flow(qdisc_priv(sch), flow))
if (list_empty(&flow->list))
return -EINVAL;
if (flow->filter_list || flow == &p->link)
return -EBUSY;
@ -361,12 +341,12 @@ static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
if (walker->stop)
return;
for (flow = p->flows; flow; flow = flow->next) {
if (walker->count >= walker->skip)
if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
walker->stop = 1;
break;
}
list_for_each_entry(flow, &p->flows, list) {
if (walker->count >= walker->skip &&
walker->fn(sch, (unsigned long)flow, walker) < 0) {
walker->stop = 1;
break;
}
walker->count++;
}
}
@ -385,16 +365,17 @@ static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
struct atm_flow_data *flow = NULL; /* @@@ */
struct atm_flow_data *flow;
struct tcf_result res;
int result;
int ret = NET_XMIT_POLICED;
pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
result = TC_POLICE_OK; /* be nice to gcc */
flow = NULL;
if (TC_H_MAJ(skb->priority) != sch->handle ||
!(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
for (flow = p->flows; flow; flow = flow->next)
!(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
list_for_each_entry(flow, &p->flows, list) {
if (flow->filter_list) {
result = tc_classify_compat(skb,
flow->filter_list,
@ -404,8 +385,13 @@ static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
flow = (struct atm_flow_data *)res.class;
if (!flow)
flow = lookup_flow(sch, res.classid);
break;
goto done;
}
}
flow = NULL;
done:
;
}
if (!flow)
flow = &p->link;
else {
@ -477,7 +463,9 @@ static void sch_atm_dequeue(unsigned long data)
struct sk_buff *skb;
pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
for (flow = p->link.next; flow; flow = flow->next)
list_for_each_entry(flow, &p->flows, list) {
if (flow == &p->link)
continue;
/*
* If traffic is properly shaped, this won't generate nasty
* little bursts. Otherwise, it may ... (but that's okay)
@ -512,6 +500,7 @@ static void sch_atm_dequeue(unsigned long data)
/* atm.atm_options are already set by atm_tc_enqueue */
flow->vcc->send(flow->vcc, skb);
}
}
}
static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
@ -543,9 +532,10 @@ static unsigned int atm_tc_drop(struct Qdisc *sch)
unsigned int len;
pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
for (flow = p->flows; flow; flow = flow->next)
list_for_each_entry(flow, &p->flows, list) {
if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
return len;
}
return 0;
}
@ -554,7 +544,9 @@ static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
struct atm_qdisc_data *p = qdisc_priv(sch);
pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
p->flows = &p->link;
INIT_LIST_HEAD(&p->flows);
INIT_LIST_HEAD(&p->link.list);
list_add(&p->link.list, &p->flows);
p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
&pfifo_qdisc_ops, sch->handle);
if (!p->link.q)
@ -565,7 +557,6 @@ static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
p->link.sock = NULL;
p->link.classid = sch->handle;
p->link.ref = 1;
p->link.next = NULL;
tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
return 0;
}
@ -576,7 +567,7 @@ static void atm_tc_reset(struct Qdisc *sch)
struct atm_flow_data *flow;
pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
for (flow = p->flows; flow; flow = flow->next)
list_for_each_entry(flow, &p->flows, list)
qdisc_reset(flow->q);
sch->q.qlen = 0;
}
@ -584,24 +575,17 @@ static void atm_tc_reset(struct Qdisc *sch)
static void atm_tc_destroy(struct Qdisc *sch)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
struct atm_flow_data *flow;
struct atm_flow_data *flow, *tmp;
pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
for (flow = p->flows; flow; flow = flow->next)
list_for_each_entry(flow, &p->flows, list)
tcf_destroy_chain(&flow->filter_list);
/* races ? */
while ((flow = p->flows)) {
list_for_each_entry_safe(flow, tmp, &p->flows, list) {
if (flow->ref > 1)
printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
flow->ref);
atm_tc_put(sch, (unsigned long)flow);
if (p->flows == flow) {
printk(KERN_ERR "atm_destroy: putting flow %p didn't "
"kill it\n", flow);
p->flows = flow->next; /* brute force */
break;
}
}
tasklet_kill(&p->task);
}
@ -615,7 +599,7 @@ static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
sch, p, flow, skb, tcm);
if (!find_flow(p, flow))
if (list_empty(&flow->list))
return -EINVAL;
tcm->tcm_handle = flow->classid;
tcm->tcm_info = flow->q->handle;