diff options
Diffstat (limited to 'net/sched/sch_fifo.c')
| -rw-r--r-- | net/sched/sch_fifo.c | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c new file mode 100644 index 000000000000..4888305c96da --- /dev/null +++ b/net/sched/sch_fifo.c @@ -0,0 +1,212 @@ +/* + * net/sched/sch_fifo.c The simplest FIFO queue. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <linux/bitops.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/in.h> +#include <linux/errno.h> +#include <linux/interrupt.h> +#include <linux/if_ether.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/notifier.h> +#include <net/ip.h> +#include <net/route.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/pkt_sched.h> + +/* 1 band FIFO pseudo-"scheduler" */ + +struct fifo_sched_data +{ + unsigned limit; +}; + +static int +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; +} + +static void +fifo_reset(struct Qdisc* sch) +{ + skb_queue_purge(&sch->q); + sch->qstats.backlog = 0; +} + +static int +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; +} + +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); +} + +static int fifo_init(struct Qdisc *sch, struct rtattr *opt) +{ + struct fifo_sched_data *q = qdisc_priv(sch); + + if (opt == NULL) { + unsigned int limit = sch->dev->tx_queue_len ? : 1; + + if (sch->ops == &bfifo_qdisc_ops) + q->limit = limit*sch->dev->mtu; + else + q->limit = limit; + } else { + struct tc_fifo_qopt *ctl = RTA_DATA(opt); + if (opt->rta_len < RTA_LENGTH(sizeof(*ctl))) + return -EINVAL; + q->limit = ctl->limit; + } + return 0; +} + +static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb) +{ + struct fifo_sched_data *q = qdisc_priv(sch); + unsigned char *b = skb->tail; + struct tc_fifo_qopt opt; + + opt.limit = q->limit; + RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); + + return skb->len; + +rtattr_failure: + skb_trim(skb, b - skb->data); + return -1; +} + +struct Qdisc_ops pfifo_qdisc_ops = { + .next = NULL, + .cl_ops = NULL, + .id = "pfifo", + .priv_size = sizeof(struct fifo_sched_data), + .enqueue = pfifo_enqueue, + .dequeue = pfifo_dequeue, + .requeue = pfifo_requeue, + .drop = fifo_drop, + .init = fifo_init, + .reset = fifo_reset, + .destroy = NULL, + .change = fifo_init, + .dump = fifo_dump, + .owner = THIS_MODULE, +}; + +struct Qdisc_ops bfifo_qdisc_ops = { + .next = NULL, + .cl_ops = NULL, + .id = "bfifo", + .priv_size = sizeof(struct fifo_sched_data), + .enqueue = bfifo_enqueue, + .dequeue = bfifo_dequeue, + .requeue = bfifo_requeue, + .drop = fifo_drop, + .init = fifo_init, + .reset = fifo_reset, + .destroy = NULL, + .change = fifo_init, + .dump = fifo_dump, + .owner = THIS_MODULE, +}; + +EXPORT_SYMBOL(bfifo_qdisc_ops); +EXPORT_SYMBOL(pfifo_qdisc_ops); |