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Diffstat (limited to 'net/sched/sch_netem.c')
-rw-r--r--net/sched/sch_netem.c163
1 files changed, 23 insertions, 140 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index a11959908d9..d876b873484 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -46,9 +46,6 @@
layering other disciplines. It does not need to do bandwidth
control either since that can be handled by using token
bucket or other rate control.
-
- The simulator is limited by the Linux timer resolution
- and will create packet bursts on the HZ boundary (1ms).
*/
struct netem_sched_data {
@@ -233,7 +230,11 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
*/
cb->time_to_send = psched_get_time();
q->counter = 0;
- ret = q->qdisc->ops->requeue(skb, q->qdisc);
+
+ __skb_queue_head(&q->qdisc->q, skb);
+ q->qdisc->qstats.backlog += qdisc_pkt_len(skb);
+ q->qdisc->qstats.requeues++;
+ ret = NET_XMIT_SUCCESS;
}
if (likely(ret == NET_XMIT_SUCCESS)) {
@@ -248,20 +249,6 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch)
return ret;
}
-/* Requeue packets but don't change time stamp */
-static int netem_requeue(struct sk_buff *skb, struct Qdisc *sch)
-{
- struct netem_sched_data *q = qdisc_priv(sch);
- int ret;
-
- if ((ret = q->qdisc->ops->requeue(skb, q->qdisc)) == 0) {
- sch->q.qlen++;
- sch->qstats.requeues++;
- }
-
- return ret;
-}
-
static unsigned int netem_drop(struct Qdisc* sch)
{
struct netem_sched_data *q = qdisc_priv(sch);
@@ -279,29 +266,25 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
struct netem_sched_data *q = qdisc_priv(sch);
struct sk_buff *skb;
- smp_mb();
if (sch->flags & TCQ_F_THROTTLED)
return NULL;
- skb = q->qdisc->dequeue(q->qdisc);
+ skb = q->qdisc->ops->peek(q->qdisc);
if (skb) {
const struct netem_skb_cb *cb = netem_skb_cb(skb);
psched_time_t now = psched_get_time();
/* if more time remaining? */
if (cb->time_to_send <= now) {
+ skb = qdisc_dequeue_peeked(q->qdisc);
+ if (unlikely(!skb))
+ return NULL;
+
pr_debug("netem_dequeue: return skb=%p\n", skb);
sch->q.qlen--;
return skb;
}
- if (unlikely(q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS)) {
- qdisc_tree_decrease_qlen(q->qdisc, 1);
- sch->qstats.drops++;
- printk(KERN_ERR "netem: %s could not requeue\n",
- q->qdisc->ops->id);
- }
-
qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send);
}
@@ -344,14 +327,13 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
root_lock = qdisc_root_sleeping_lock(sch);
spin_lock_bh(root_lock);
- d = xchg(&q->delay_dist, d);
+ kfree(q->delay_dist);
+ q->delay_dist = d;
spin_unlock_bh(root_lock);
-
- kfree(d);
return 0;
}
-static int get_correlation(struct Qdisc *sch, const struct nlattr *attr)
+static void get_correlation(struct Qdisc *sch, const struct nlattr *attr)
{
struct netem_sched_data *q = qdisc_priv(sch);
const struct tc_netem_corr *c = nla_data(attr);
@@ -359,27 +341,24 @@ static int get_correlation(struct Qdisc *sch, const struct nlattr *attr)
init_crandom(&q->delay_cor, c->delay_corr);
init_crandom(&q->loss_cor, c->loss_corr);
init_crandom(&q->dup_cor, c->dup_corr);
- return 0;
}
-static int get_reorder(struct Qdisc *sch, const struct nlattr *attr)
+static void get_reorder(struct Qdisc *sch, const struct nlattr *attr)
{
struct netem_sched_data *q = qdisc_priv(sch);
const struct tc_netem_reorder *r = nla_data(attr);
q->reorder = r->probability;
init_crandom(&q->reorder_cor, r->correlation);
- return 0;
}
-static int get_corrupt(struct Qdisc *sch, const struct nlattr *attr)
+static void get_corrupt(struct Qdisc *sch, const struct nlattr *attr)
{
struct netem_sched_data *q = qdisc_priv(sch);
const struct tc_netem_corrupt *r = nla_data(attr);
q->corrupt = r->probability;
init_crandom(&q->corrupt_cor, r->correlation);
- return 0;
}
static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = {
@@ -438,11 +417,8 @@ static int netem_change(struct Qdisc *sch, struct nlattr *opt)
if (q->gap)
q->reorder = ~0;
- if (tb[TCA_NETEM_CORR]) {
- ret = get_correlation(sch, tb[TCA_NETEM_CORR]);
- if (ret)
- return ret;
- }
+ if (tb[TCA_NETEM_CORR])
+ get_correlation(sch, tb[TCA_NETEM_CORR]);
if (tb[TCA_NETEM_DELAY_DIST]) {
ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST]);
@@ -450,17 +426,11 @@ static int netem_change(struct Qdisc *sch, struct nlattr *opt)
return ret;
}
- if (tb[TCA_NETEM_REORDER]) {
- ret = get_reorder(sch, tb[TCA_NETEM_REORDER]);
- if (ret)
- return ret;
- }
+ if (tb[TCA_NETEM_REORDER])
+ get_reorder(sch, tb[TCA_NETEM_REORDER]);
- if (tb[TCA_NETEM_CORRUPT]) {
- ret = get_corrupt(sch, tb[TCA_NETEM_CORRUPT]);
- if (ret)
- return ret;
- }
+ if (tb[TCA_NETEM_CORRUPT])
+ get_corrupt(sch, tb[TCA_NETEM_CORRUPT]);
return 0;
}
@@ -541,7 +511,7 @@ static struct Qdisc_ops tfifo_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct fifo_sched_data),
.enqueue = tfifo_enqueue,
.dequeue = qdisc_dequeue_head,
- .requeue = qdisc_requeue,
+ .peek = qdisc_peek_head,
.drop = qdisc_queue_drop,
.init = tfifo_init,
.reset = qdisc_reset_queue,
@@ -624,99 +594,12 @@ nla_put_failure:
return -1;
}
-static int netem_dump_class(struct Qdisc *sch, unsigned long cl,
- struct sk_buff *skb, struct tcmsg *tcm)
-{
- struct netem_sched_data *q = qdisc_priv(sch);
-
- if (cl != 1) /* only one class */
- return -ENOENT;
-
- tcm->tcm_handle |= TC_H_MIN(1);
- tcm->tcm_info = q->qdisc->handle;
-
- return 0;
-}
-
-static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
- struct Qdisc **old)
-{
- struct netem_sched_data *q = qdisc_priv(sch);
-
- if (new == NULL)
- new = &noop_qdisc;
-
- sch_tree_lock(sch);
- *old = xchg(&q->qdisc, new);
- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
- qdisc_reset(*old);
- sch_tree_unlock(sch);
-
- return 0;
-}
-
-static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg)
-{
- struct netem_sched_data *q = qdisc_priv(sch);
- return q->qdisc;
-}
-
-static unsigned long netem_get(struct Qdisc *sch, u32 classid)
-{
- return 1;
-}
-
-static void netem_put(struct Qdisc *sch, unsigned long arg)
-{
-}
-
-static int netem_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
- struct nlattr **tca, unsigned long *arg)
-{
- return -ENOSYS;
-}
-
-static int netem_delete(struct Qdisc *sch, unsigned long arg)
-{
- return -ENOSYS;
-}
-
-static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker)
-{
- if (!walker->stop) {
- if (walker->count >= walker->skip)
- if (walker->fn(sch, 1, walker) < 0) {
- walker->stop = 1;
- return;
- }
- walker->count++;
- }
-}
-
-static struct tcf_proto **netem_find_tcf(struct Qdisc *sch, unsigned long cl)
-{
- return NULL;
-}
-
-static const struct Qdisc_class_ops netem_class_ops = {
- .graft = netem_graft,
- .leaf = netem_leaf,
- .get = netem_get,
- .put = netem_put,
- .change = netem_change_class,
- .delete = netem_delete,
- .walk = netem_walk,
- .tcf_chain = netem_find_tcf,
- .dump = netem_dump_class,
-};
-
static struct Qdisc_ops netem_qdisc_ops __read_mostly = {
.id = "netem",
- .cl_ops = &netem_class_ops,
.priv_size = sizeof(struct netem_sched_data),
.enqueue = netem_enqueue,
.dequeue = netem_dequeue,
- .requeue = netem_requeue,
+ .peek = qdisc_peek_dequeued,
.drop = netem_drop,
.init = netem_init,
.reset = netem_reset,
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-29 08:09:57 +0000