leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

net: sched: introduce and use qdisc tree flush/purge helpers

Browse Source 
The same code to flush qdisc tree and purge the qdisc queue
is duplicated in many places and in most cases it does not
respect NOLOCK qdisc: the global backlog len is used and the
per CPU values are ignored.

This change addresses the above, factoring-out the relevant
code and using the helpers introduced by the previous patch
to fetch the correct backlog len.

Fixes: c5ad119fb6 ("net: sched: pfifo_fast use skb_array")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2019-03-28 16:53:13 +01:00 committed by David S. Miller
parent 5dd431b6b9
commit e5f0e8f8e4
11 changed files with 35 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
include/net/sch_generic.h
View File

@ -941,6 +941,23 @@ static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
*backlog = qstats.backlog;
}
static inline void qdisc_tree_flush_backlog(struct Qdisc *sch)
{
__u32 qlen, backlog;
qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
qdisc_tree_reduce_backlog(sch, qlen, backlog);
}
static inline void qdisc_purge_queue(struct Qdisc *sch)
{
__u32 qlen, backlog;
qdisc_qstats_qlen_backlog(sch, &qlen, &backlog);
qdisc_reset(sch);
qdisc_tree_reduce_backlog(sch, qlen, backlog);
}
static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
{
qh->head = NULL;
@ -1124,13 +1141,8 @@ static inline struct Qdisc *qdisc_replace(struct Qdisc *sch, struct Qdisc *new,
sch_tree_lock(sch);
old = *pold;
*pold = new;
if (old != NULL) {
unsigned int qlen = old->q.qlen;
unsigned int backlog = old->qstats.backlog;
qdisc_reset(old);
qdisc_tree_reduce_backlog(old, qlen, backlog);
}
if (old != NULL)
qdisc_tree_flush_backlog(old);
sch_tree_unlock(sch);
return old;

6
net/sched/sch_cbq.c
View File

@ -1667,17 +1667,13 @@ static int cbq_delete(struct Qdisc *sch, unsigned long arg)
{
struct cbq_sched_data *q = qdisc_priv(sch);
struct cbq_class *cl = (struct cbq_class *)arg;
unsigned int qlen, backlog;
if (cl->filters || cl->children || cl == &q->link)
return -EBUSY;
sch_tree_lock(sch);
qlen = cl->q->q.qlen;
backlog = cl->q->qstats.backlog;
qdisc_reset(cl->q);
qdisc_tree_reduce_backlog(cl->q, qlen, backlog);
qdisc_purge_queue(cl->q);
if (cl->next_alive)
cbq_deactivate_class(cl);

11
net/sched/sch_drr.c
View File

@ -50,15 +50,6 @@ static struct drr_class *drr_find_class(struct Qdisc *sch, u32 classid)
return container_of(clc, struct drr_class, common);
}
static void drr_purge_queue(struct drr_class *cl)
{
unsigned int len = cl->qdisc->q.qlen;
unsigned int backlog = cl->qdisc->qstats.backlog;
qdisc_reset(cl->qdisc);
qdisc_tree_reduce_backlog(cl->qdisc, len, backlog);
}
static const struct nla_policy drr_policy[TCA_DRR_MAX + 1] = {
[TCA_DRR_QUANTUM] = { .type = NLA_U32 },
};
@ -167,7 +158,7 @@ static int drr_delete_class(struct Qdisc *sch, unsigned long arg)
sch_tree_lock(sch);
drr_purge_queue(cl);
qdisc_purge_queue(cl->qdisc);
qdisc_class_hash_remove(&q->clhash, &cl->common);
sch_tree_unlock(sch);

14
net/sched/sch_hfsc.c
View File

@ -844,16 +844,6 @@ qdisc_peek_len(struct Qdisc *sch)
return len;
}
static void
hfsc_purge_queue(struct Qdisc *sch, struct hfsc_class *cl)
{
unsigned int len = cl->qdisc->q.qlen;
unsigned int backlog = cl->qdisc->qstats.backlog;
qdisc_reset(cl->qdisc);
qdisc_tree_reduce_backlog(cl->qdisc, len, backlog);
}
static void
hfsc_adjust_levels(struct hfsc_class *cl)
{
@ -1076,7 +1066,7 @@ hfsc_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
qdisc_class_hash_insert(&q->clhash, &cl->cl_common);
list_add_tail(&cl->siblings, &parent->children);
if (parent->level == 0)
hfsc_purge_queue(sch, parent);
qdisc_purge_queue(parent->qdisc);
hfsc_adjust_levels(parent);
sch_tree_unlock(sch);
@ -1112,7 +1102,7 @@ hfsc_delete_class(struct Qdisc *sch, unsigned long arg)
list_del(&cl->siblings);
hfsc_adjust_levels(cl->cl_parent);
hfsc_purge_queue(sch, cl);
qdisc_purge_queue(cl->qdisc);
qdisc_class_hash_remove(&q->clhash, &cl->cl_common);
sch_tree_unlock(sch);

15
net/sched/sch_htb.c
View File

@ -1269,13 +1269,8 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)
sch_tree_lock(sch);
if (!cl->level) {
unsigned int qlen = cl->leaf.q->q.qlen;
unsigned int backlog = cl->leaf.q->qstats.backlog;
qdisc_reset(cl->leaf.q);
qdisc_tree_reduce_backlog(cl->leaf.q, qlen, backlog);
}
if (!cl->level)
qdisc_purge_queue(cl->leaf.q);
/* delete from hash and active; remainder in destroy_class */
qdisc_class_hash_remove(&q->clhash, &cl->common);
@ -1403,12 +1398,8 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
classid, NULL);
sch_tree_lock(sch);
if (parent && !parent->level) {
unsigned int qlen = parent->leaf.q->q.qlen;
unsigned int backlog = parent->leaf.q->qstats.backlog;
/* turn parent into inner node */
qdisc_reset(parent->leaf.q);
qdisc_tree_reduce_backlog(parent->leaf.q, qlen, backlog);
qdisc_purge_queue(parent->leaf.q);
qdisc_put(parent->leaf.q);
if (parent->prio_activity)
htb_deactivate(q, parent);

8
net/sched/sch_multiq.c
View File

@ -201,9 +201,9 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt,
for (i = q->bands; i < q->max_bands; i++) {
if (q->queues[i] != &noop_qdisc) {
struct Qdisc *child = q->queues[i];
q->queues[i] = &noop_qdisc;
qdisc_tree_reduce_backlog(child, child->q.qlen,
child->qstats.backlog);
qdisc_tree_flush_backlog(child);
qdisc_put(child);
}
}
@ -225,9 +225,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt,
qdisc_hash_add(child, true);
if (old != &noop_qdisc) {
qdisc_tree_reduce_backlog(old,
old->q.qlen,
old->qstats.backlog);
qdisc_tree_flush_backlog(old);
qdisc_put(old);
}
sch_tree_unlock(sch);

8
net/sched/sch_prio.c
View File

@ -216,12 +216,8 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt,
q->bands = qopt->bands;
memcpy(q->prio2band, qopt->priomap, TC_PRIO_MAX+1);
for (i = q->bands; i < oldbands; i++) {
struct Qdisc *child = q->queues[i];
qdisc_tree_reduce_backlog(child, child->q.qlen,
child->qstats.backlog);
}
for (i = q->bands; i < oldbands; i++)
qdisc_tree_flush_backlog(q->queues[i]);
for (i = oldbands; i < q->bands; i++) {
q->queues[i] = queues[i];

11
net/sched/sch_qfq.c
View File

@ -217,15 +217,6 @@ static struct qfq_class *qfq_find_class(struct Qdisc *sch, u32 classid)
return container_of(clc, struct qfq_class, common);
}
static void qfq_purge_queue(struct qfq_class *cl)
{
unsigned int len = cl->qdisc->q.qlen;
unsigned int backlog = cl->qdisc->qstats.backlog;
qdisc_reset(cl->qdisc);
qdisc_tree_reduce_backlog(cl->qdisc, len, backlog);
}
static const struct nla_policy qfq_policy[TCA_QFQ_MAX + 1] = {
[TCA_QFQ_WEIGHT] = { .type = NLA_U32 },
[TCA_QFQ_LMAX] = { .type = NLA_U32 },
@ -551,7 +542,7 @@ static int qfq_delete_class(struct Qdisc *sch, unsigned long arg)
sch_tree_lock(sch);
qfq_purge_queue(cl);
qdisc_purge_queue(cl->qdisc);
qdisc_class_hash_remove(&q->clhash, &cl->common);
sch_tree_unlock(sch);

3
net/sched/sch_red.c
View File

@ -233,8 +233,7 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt,
q->flags = ctl->flags;
q->limit = ctl->limit;
if (child) {
qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
q->qdisc->qstats.backlog);
qdisc_tree_flush_backlog(q->qdisc);
old_child = q->qdisc;
q->qdisc = child;
}

3
net/sched/sch_sfb.c
View File

@ -521,8 +521,7 @@ static int sfb_change(struct Qdisc *sch, struct nlattr *opt,
qdisc_hash_add(child, true);
sch_tree_lock(sch);
qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
q->qdisc->qstats.backlog);
qdisc_tree_flush_backlog(q->qdisc);
qdisc_put(q->qdisc);
q->qdisc = child;

3
net/sched/sch_tbf.c
View File

@ -391,8 +391,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt,
sch_tree_lock(sch);
if (child) {
qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
q->qdisc->qstats.backlog);
qdisc_tree_flush_backlog(q->qdisc);
qdisc_put(q->qdisc);
q->qdisc = child;
}