/*
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/*
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* net/sched/sch_fifo.c The simplest FIFO queue.
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* net/sched/sch_fifo.c The simplest FIFO queue.
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*
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*
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* This program is free software; you can redistribute it and/or
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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* 2 of the License, or (at your option) any later version.
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*
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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*/
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#include <linux/config.h>
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#include <linux/config.h>
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#include <asm/uaccess.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <asm/bitops.h>
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#include <asm/bitops.h>
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#include <linux/types.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/notifier.h>
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#include <linux/notifier.h>
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#include <net/ip.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/route.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_sched.h>
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/* 1 band FIFO pseudo-"scheduler" */
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/* 1 band FIFO pseudo-"scheduler" */
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struct fifo_sched_data
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struct fifo_sched_data
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{
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{
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unsigned limit;
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unsigned limit;
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};
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};
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static int
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static int
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bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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bfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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{
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{
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struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
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struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
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if (sch->stats.backlog + skb->len <= q->limit) {
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if (sch->stats.backlog + skb->len <= q->limit) {
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__skb_queue_tail(&sch->q, skb);
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__skb_queue_tail(&sch->q, skb);
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sch->stats.backlog += skb->len;
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sch->stats.backlog += skb->len;
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sch->stats.bytes += skb->len;
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sch->stats.bytes += skb->len;
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sch->stats.packets++;
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sch->stats.packets++;
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return 0;
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return 0;
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}
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}
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sch->stats.drops++;
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sch->stats.drops++;
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#ifdef CONFIG_NET_CLS_POLICE
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#ifdef CONFIG_NET_CLS_POLICE
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if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
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if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
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#endif
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#endif
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kfree_skb(skb);
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kfree_skb(skb);
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return NET_XMIT_DROP;
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return NET_XMIT_DROP;
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}
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}
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static int
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static int
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bfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
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bfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
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{
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{
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__skb_queue_head(&sch->q, skb);
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__skb_queue_head(&sch->q, skb);
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sch->stats.backlog += skb->len;
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sch->stats.backlog += skb->len;
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return 0;
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return 0;
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}
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}
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static struct sk_buff *
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static struct sk_buff *
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bfifo_dequeue(struct Qdisc* sch)
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bfifo_dequeue(struct Qdisc* sch)
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{
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{
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struct sk_buff *skb;
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struct sk_buff *skb;
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skb = __skb_dequeue(&sch->q);
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skb = __skb_dequeue(&sch->q);
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if (skb)
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if (skb)
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sch->stats.backlog -= skb->len;
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sch->stats.backlog -= skb->len;
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return skb;
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return skb;
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}
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}
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static unsigned int
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static unsigned int
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fifo_drop(struct Qdisc* sch)
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fifo_drop(struct Qdisc* sch)
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{
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{
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struct sk_buff *skb;
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struct sk_buff *skb;
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skb = __skb_dequeue_tail(&sch->q);
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skb = __skb_dequeue_tail(&sch->q);
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if (skb) {
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if (skb) {
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unsigned int len = skb->len;
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unsigned int len = skb->len;
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sch->stats.backlog -= len;
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sch->stats.backlog -= len;
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kfree_skb(skb);
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kfree_skb(skb);
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return len;
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return len;
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}
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}
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return 0;
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return 0;
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}
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}
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static void
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static void
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fifo_reset(struct Qdisc* sch)
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fifo_reset(struct Qdisc* sch)
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{
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{
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skb_queue_purge(&sch->q);
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skb_queue_purge(&sch->q);
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sch->stats.backlog = 0;
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sch->stats.backlog = 0;
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}
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}
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static int
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static int
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pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
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{
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{
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struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
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struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
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if (sch->q.qlen < q->limit) {
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if (sch->q.qlen < q->limit) {
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__skb_queue_tail(&sch->q, skb);
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__skb_queue_tail(&sch->q, skb);
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sch->stats.bytes += skb->len;
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sch->stats.bytes += skb->len;
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sch->stats.packets++;
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sch->stats.packets++;
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return 0;
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return 0;
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}
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}
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sch->stats.drops++;
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sch->stats.drops++;
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#ifdef CONFIG_NET_CLS_POLICE
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#ifdef CONFIG_NET_CLS_POLICE
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if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
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if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch))
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#endif
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#endif
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kfree_skb(skb);
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kfree_skb(skb);
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return NET_XMIT_DROP;
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return NET_XMIT_DROP;
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}
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}
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static int
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static int
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pfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
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pfifo_requeue(struct sk_buff *skb, struct Qdisc* sch)
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{
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{
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__skb_queue_head(&sch->q, skb);
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__skb_queue_head(&sch->q, skb);
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return 0;
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return 0;
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}
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}
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static struct sk_buff *
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static struct sk_buff *
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pfifo_dequeue(struct Qdisc* sch)
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pfifo_dequeue(struct Qdisc* sch)
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{
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{
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return __skb_dequeue(&sch->q);
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return __skb_dequeue(&sch->q);
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}
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}
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static int fifo_init(struct Qdisc *sch, struct rtattr *opt)
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static int fifo_init(struct Qdisc *sch, struct rtattr *opt)
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{
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{
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struct fifo_sched_data *q = (void*)sch->data;
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struct fifo_sched_data *q = (void*)sch->data;
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if (opt == NULL) {
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if (opt == NULL) {
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unsigned int limit = sch->dev->tx_queue_len ? : 1;
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unsigned int limit = sch->dev->tx_queue_len ? : 1;
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if (sch->ops == &bfifo_qdisc_ops)
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if (sch->ops == &bfifo_qdisc_ops)
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q->limit = limit*sch->dev->mtu;
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q->limit = limit*sch->dev->mtu;
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else
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else
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q->limit = limit;
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q->limit = limit;
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} else {
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} else {
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struct tc_fifo_qopt *ctl = RTA_DATA(opt);
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struct tc_fifo_qopt *ctl = RTA_DATA(opt);
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if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
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if (opt->rta_len < RTA_LENGTH(sizeof(*ctl)))
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return -EINVAL;
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return -EINVAL;
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q->limit = ctl->limit;
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q->limit = ctl->limit;
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}
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}
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return 0;
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return 0;
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}
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}
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static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
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static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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{
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struct fifo_sched_data *q = (void*)sch->data;
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struct fifo_sched_data *q = (void*)sch->data;
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unsigned char *b = skb->tail;
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unsigned char *b = skb->tail;
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struct tc_fifo_qopt opt;
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struct tc_fifo_qopt opt;
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opt.limit = q->limit;
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opt.limit = q->limit;
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RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
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RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
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return skb->len;
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return skb->len;
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rtattr_failure:
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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skb_trim(skb, b - skb->data);
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return -1;
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return -1;
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}
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}
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struct Qdisc_ops pfifo_qdisc_ops =
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struct Qdisc_ops pfifo_qdisc_ops =
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{
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{
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NULL,
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NULL,
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NULL,
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NULL,
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"pfifo",
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"pfifo",
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sizeof(struct fifo_sched_data),
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sizeof(struct fifo_sched_data),
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pfifo_enqueue,
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pfifo_enqueue,
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pfifo_dequeue,
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pfifo_dequeue,
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pfifo_requeue,
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pfifo_requeue,
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fifo_drop,
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fifo_drop,
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fifo_init,
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fifo_init,
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fifo_reset,
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fifo_reset,
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NULL,
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NULL,
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fifo_init,
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fifo_init,
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fifo_dump,
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fifo_dump,
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};
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};
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struct Qdisc_ops bfifo_qdisc_ops =
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struct Qdisc_ops bfifo_qdisc_ops =
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{
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{
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NULL,
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NULL,
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NULL,
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NULL,
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"bfifo",
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"bfifo",
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sizeof(struct fifo_sched_data),
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sizeof(struct fifo_sched_data),
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bfifo_enqueue,
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bfifo_enqueue,
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bfifo_dequeue,
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bfifo_dequeue,
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bfifo_requeue,
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bfifo_requeue,
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fifo_drop,
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fifo_drop,
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fifo_init,
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fifo_init,
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fifo_reset,
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fifo_reset,
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NULL,
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NULL,
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fifo_init,
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fifo_init,
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fifo_dump,
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fifo_dump,
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};
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};
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