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authorJarek Poplawski <jarkao2@gmail.com>2008-10-31 00:45:27 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-31 00:45:27 -0700
commit99c0db26797edb39cf83c8c5f8972067f5426b4e (patch)
tree918b933d2ac5f0579b24636274c4394c17011d0d /net/sched
parent48a8f519e0fe22a5c98523286b2a120841a11dd5 (diff)
downloadlinux-2.6.38-lt-ux500-99c0db26797edb39cf83c8c5f8972067f5426b4e.tar.gz
pkt_sched: sch_generic: Add generic qdisc->ops->peek() implementation.
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_api.c12
-rw-r--r--net/sched/sch_generic.c16
2 files changed, 28 insertions, 0 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index b16ad2972c6..e5646614e88 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -102,6 +102,10 @@ static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n,
requeues once dequeued packet. It is used for non-standard or
just buggy devices, which can defer output even if netif_queue_stopped()=0.
+ ---peek
+
+ like dequeue but without removing a packet from the queue
+
---reset
returns qdisc to initial state: purge all buffers, clear all
@@ -149,6 +153,14 @@ int register_qdisc(struct Qdisc_ops *qops)
qops->enqueue = noop_qdisc_ops.enqueue;
if (qops->requeue == NULL)
qops->requeue = noop_qdisc_ops.requeue;
+ if (qops->peek == NULL) {
+ if (qops->dequeue == NULL) {
+ qops->peek = noop_qdisc_ops.peek;
+ } else {
+ rc = -EINVAL;
+ goto out;
+ }
+ }
if (qops->dequeue == NULL)
qops->dequeue = noop_qdisc_ops.dequeue;
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 93cd30ce650..318c9f656e8 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -320,6 +320,7 @@ struct Qdisc_ops noop_qdisc_ops __read_mostly = {
.priv_size = 0,
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
+ .peek = noop_dequeue,
.requeue = noop_requeue,
.owner = THIS_MODULE,
};
@@ -346,6 +347,7 @@ static struct Qdisc_ops noqueue_qdisc_ops __read_mostly = {
.priv_size = 0,
.enqueue = noop_enqueue,
.dequeue = noop_dequeue,
+ .peek = noop_dequeue,
.requeue = noop_requeue,
.owner = THIS_MODULE,
};
@@ -411,6 +413,19 @@ static struct sk_buff *pfifo_fast_dequeue(struct Qdisc* qdisc)
return NULL;
}
+static struct sk_buff *pfifo_fast_peek(struct Qdisc* qdisc)
+{
+ int prio;
+ struct sk_buff_head *list = qdisc_priv(qdisc);
+
+ for (prio = 0; prio < PFIFO_FAST_BANDS; prio++) {
+ if (!skb_queue_empty(list + prio))
+ return skb_peek(list + prio);
+ }
+
+ return NULL;
+}
+
static int pfifo_fast_requeue(struct sk_buff *skb, struct Qdisc* qdisc)
{
qdisc->q.qlen++;
@@ -457,6 +472,7 @@ static struct Qdisc_ops pfifo_fast_ops __read_mostly = {
.priv_size = PFIFO_FAST_BANDS * sizeof(struct sk_buff_head),
.enqueue = pfifo_fast_enqueue,
.dequeue = pfifo_fast_dequeue,
+ .peek = pfifo_fast_peek,
.requeue = pfifo_fast_requeue,
.init = pfifo_fast_init,
.reset = pfifo_fast_reset,