[PKT_SCHED]: Transform fifo qdisc to use generic queue management interface

The simplicity of the fifo qdisc allows several qdisc operations to be
redirected to the relevant queue management function directly. Saves
a lot of code lines and gives the pfifo a byte based backlog.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 88 deletions

diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
index 4888305c96da..83a4db4d3cdc 100644
--- a/net/sched/sch_fifo.c
+++ b/net/sched/sch_fifo.c
@@ -47,61 +47,10 @@ bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
         struct fifo_sched_data *q = qdisc_priv(sch);
 
-        if (sch->qstats.backlog + skb->len <= q->limit) {
-                __skb_queue_tail(&sch->q, skb);
-                sch->qstats.backlog += skb->len;
-                sch->bstats.bytes += skb->len;
-                sch->bstats.packets++;
-                return 0;
-        }
-        sch->qstats.drops++;
-#ifdef CONFIG_NET_CLS_POLICE
-        if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
-#endif
-                kfree_skb(skb);
-        return NET_XMIT_DROP;
-}
-
-static int
-bfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
-{
-        __skb_queue_head(&sch->q, skb);
-        sch->qstats.backlog += skb->len;
-        sch->qstats.requeues++;
-        return 0;
-}
-
-static struct sk_buff *
-bfifo_dequeue(struct Qdisc* sch)
-{
-        struct sk_buff *skb;
-
-        skb = __skb_dequeue(&sch->q);
-        if (skb)
-                sch->qstats.backlog -= skb->len;
-        return skb;
-}
-
-static unsigned int 
-fifo_drop(struct Qdisc* sch)
-{
-        struct sk_buff *skb;
-
-        skb = __skb_dequeue_tail(&sch->q);
-        if (skb) {
-                unsigned int len = skb->len;
-                sch->qstats.backlog -= len;
-                kfree_skb(skb);
-                return len;
-        }
-        return 0;
-}
+        if (likely(sch->qstats.backlog + skb->len <= q->limit))
+                return qdisc_enqueue_tail(skb, sch);
 
-static void
-fifo_reset(struct Qdisc* sch)
-{
-        skb_queue_purge(&sch->q);
-        sch->qstats.backlog = 0;
+        return qdisc_reshape_fail(skb, sch);
 }
 
 static int
@@ -109,33 +58,10 @@ pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
 {
         struct fifo_sched_data *q = qdisc_priv(sch);
 
-        if (sch->q.qlen < q->limit) {
-                __skb_queue_tail(&sch->q, skb);
-                sch->bstats.bytes += skb->len;
-                sch->bstats.packets++;
-                return 0;
-        }
-        sch->qstats.drops++;
-#ifdef CONFIG_NET_CLS_POLICE
-        if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
-#endif
-                kfree_skb(skb);
-        return NET_XMIT_DROP;
-}
+        if (likely(skb_queue_len(&sch->q) < q->limit))
+                return qdisc_enqueue_tail(skb, sch);
 
-static int
-pfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
-{
-        __skb_queue_head(&sch->q, skb);
-        sch->qstats.requeues++;
-        return 0;
-}
-
-
-static struct sk_buff *
-pfifo_dequeue(struct Qdisc* sch)
-{
-        return __skb_dequeue(&sch->q);
+        return qdisc_reshape_fail(skb, sch);
 }
 
 static int fifo_init(struct Qdisc *sch, struct rtattr *opt)
@@ -180,11 +106,11 @@ struct Qdisc_ops pfifo_qdisc_ops = {
         .id             =       "pfifo",
         .priv_size      =       sizeof(struct fifo_sched_data),
         .enqueue        =       pfifo_enqueue,
-        .dequeue        =       pfifo_dequeue,
-        .requeue        =       pfifo_requeue,
-        .drop           =       fifo_drop,
+        .dequeue        =       qdisc_dequeue_head,
+        .requeue        =       qdisc_requeue,
+        .drop           =       qdisc_queue_drop,
         .init           =       fifo_init,
-        .reset          =       fifo_reset,
+        .reset          =       qdisc_reset_queue,
         .destroy        =       NULL,
         .change         =       fifo_init,
         .dump           =       fifo_dump,
@@ -197,11 +123,11 @@ struct Qdisc_ops bfifo_qdisc_ops = {
         .id             =       "bfifo",
         .priv_size      =       sizeof(struct fifo_sched_data),
         .enqueue        =       bfifo_enqueue,
-        .dequeue        =       bfifo_dequeue,
-        .requeue        =       bfifo_requeue,
-        .drop           =       fifo_drop,
+        .dequeue        =       qdisc_dequeue_head,
+        .requeue        =       qdisc_requeue,
+        .drop           =       qdisc_queue_drop,
         .init           =       fifo_init,
-        .reset          =       fifo_reset,
+        .reset          =       qdisc_reset_queue,
         .destroy        =       NULL,
         .change         =       fifo_init,
         .dump           =       fifo_dump,