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authorJarek Poplawski <jarkao2@gmail.com>2008-10-31 00:45:55 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-31 00:45:55 -0700
commit8e3af97899db433111287e07d5105189f56fe191 (patch)
tree40e7779ea4b587c9c3b882018ccaac1b53419f1c /net/sched
parent99c0db26797edb39cf83c8c5f8972067f5426b4e (diff)
downloadlinux-2.6.38-lt-ux500-8e3af97899db433111287e07d5105189f56fe191.tar.gz
pkt_sched: Add qdisc->ops->peek() implementation.
Add qdisc->ops->peek() implementation for work-conserving qdiscs. With feedback from Patrick McHardy. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_atm.c10
-rw-r--r--net/sched/sch_blackhole.c1
-rw-r--r--net/sched/sch_dsmark.c10
-rw-r--r--net/sched/sch_gred.c1
-rw-r--r--net/sched/sch_multiq.c29
-rw-r--r--net/sched/sch_netem.c1
-rw-r--r--net/sched/sch_red.c9
-rw-r--r--net/sched/sch_teql.c8
8 files changed, 69 insertions, 0 deletions
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index 43d37256c15..f9eac0818d1 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -522,6 +522,15 @@ static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
return skb;
}
+static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
+{
+ struct atm_qdisc_data *p = qdisc_priv(sch);
+
+ pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
+
+ return p->link.q->ops->peek(p->link.q);
+}
+
static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
{
struct atm_qdisc_data *p = qdisc_priv(sch);
@@ -694,6 +703,7 @@ static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct atm_qdisc_data),
.enqueue = atm_tc_enqueue,
.dequeue = atm_tc_dequeue,
+ .peek = atm_tc_peek,
.requeue = atm_tc_requeue,
.drop = atm_tc_drop,
.init = atm_tc_init,
diff --git a/net/sched/sch_blackhole.c b/net/sched/sch_blackhole.c
index 507fb488bc9..094a874b48b 100644
--- a/net/sched/sch_blackhole.c
+++ b/net/sched/sch_blackhole.c
@@ -33,6 +33,7 @@ static struct Qdisc_ops blackhole_qdisc_ops __read_mostly = {
.priv_size = 0,
.enqueue = blackhole_enqueue,
.dequeue = blackhole_dequeue,
+ .peek = blackhole_dequeue,
.owner = THIS_MODULE,
};
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index ba43aab3a85..3e491479ea8 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -313,6 +313,15 @@ static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
return skb;
}
+static struct sk_buff *dsmark_peek(struct Qdisc *sch)
+{
+ struct dsmark_qdisc_data *p = qdisc_priv(sch);
+
+ pr_debug("dsmark_peek(sch %p,[qdisc %p])\n", sch, p);
+
+ return p->q->ops->peek(p->q);
+}
+
static int dsmark_requeue(struct sk_buff *skb, struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = qdisc_priv(sch);
@@ -496,6 +505,7 @@ static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct dsmark_qdisc_data),
.enqueue = dsmark_enqueue,
.dequeue = dsmark_dequeue,
+ .peek = dsmark_peek,
.requeue = dsmark_requeue,
.drop = dsmark_drop,
.init = dsmark_init,
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index c1ad6b8de10..cb20ee3b9fc 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -602,6 +602,7 @@ static struct Qdisc_ops gred_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct gred_sched),
.enqueue = gred_enqueue,
.dequeue = gred_dequeue,
+ .peek = qdisc_peek_head,
.requeue = gred_requeue,
.drop = gred_drop,
.init = gred_init,
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index 915f3149dde..155648d23b7 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -155,6 +155,34 @@ static struct sk_buff *multiq_dequeue(struct Qdisc *sch)
}
+static struct sk_buff *multiq_peek(struct Qdisc *sch)
+{
+ struct multiq_sched_data *q = qdisc_priv(sch);
+ unsigned int curband = q->curband;
+ struct Qdisc *qdisc;
+ struct sk_buff *skb;
+ int band;
+
+ for (band = 0; band < q->bands; band++) {
+ /* cycle through bands to ensure fairness */
+ curband++;
+ if (curband >= q->bands)
+ curband = 0;
+
+ /* Check that target subqueue is available before
+ * pulling an skb to avoid excessive requeues
+ */
+ if (!__netif_subqueue_stopped(qdisc_dev(sch), curband)) {
+ qdisc = q->queues[curband];
+ skb = qdisc->ops->peek(qdisc);
+ if (skb)
+ return skb;
+ }
+ }
+ return NULL;
+
+}
+
static unsigned int multiq_drop(struct Qdisc *sch)
{
struct multiq_sched_data *q = qdisc_priv(sch);
@@ -451,6 +479,7 @@ static struct Qdisc_ops multiq_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct multiq_sched_data),
.enqueue = multiq_enqueue,
.dequeue = multiq_dequeue,
+ .peek = multiq_peek,
.requeue = multiq_requeue,
.drop = multiq_drop,
.init = multiq_init,
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index a11959908d9..2898d9dc31e 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -541,6 +541,7 @@ static struct Qdisc_ops tfifo_qdisc_ops __read_mostly = {
.priv_size = sizeof(struct fifo_sched_data),
.enqueue = tfifo_enqueue,
.dequeue = qdisc_dequeue_head,
+ .peek = qdisc_peek_head,
.requeue = qdisc_requeue,
.drop = qdisc_queue_drop,
.init = tfifo_init,
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 5da05839e22..7abc51454c2 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -140,6 +140,14 @@ static struct sk_buff * red_dequeue(struct Qdisc* sch)
return skb;
}
+static struct sk_buff * red_peek(struct Qdisc* sch)
+{
+ struct red_sched_data *q = qdisc_priv(sch);
+ struct Qdisc *child = q->qdisc;
+
+ return child->ops->peek(child);
+}
+
static unsigned int red_drop(struct Qdisc* sch)
{
struct red_sched_data *q = qdisc_priv(sch);
@@ -361,6 +369,7 @@ static struct Qdisc_ops red_qdisc_ops __read_mostly = {
.cl_ops = &red_class_ops,
.enqueue = red_enqueue,
.dequeue = red_dequeue,
+ .peek = red_peek,
.requeue = red_requeue,
.drop = red_drop,
.init = red_init,
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index d35ef059abb..bf03e7fa184 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -123,6 +123,13 @@ teql_dequeue(struct Qdisc* sch)
return skb;
}
+static struct sk_buff *
+teql_peek(struct Qdisc* sch)
+{
+ /* teql is meant to be used as root qdisc */
+ return NULL;
+}
+
static __inline__ void
teql_neigh_release(struct neighbour *n)
{
@@ -433,6 +440,7 @@ static __init void teql_master_setup(struct net_device *dev)
ops->enqueue = teql_enqueue;
ops->dequeue = teql_dequeue;
+ ops->peek = teql_peek;
ops->requeue = teql_requeue;
ops->init = teql_qdisc_init;
ops->reset = teql_reset;