sch_fifo.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:4k
- /*
- * 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 <asm/uaccess.h>
- #include <asm/system.h>
- #include <asm/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 = (struct fifo_sched_data *)sch->data;
- if (sch->stats.backlog <= q->limit) {
- __skb_queue_tail(&sch->q, skb);
- sch->stats.backlog += skb->len;
- sch->stats.bytes += skb->len;
- sch->stats.packets++;
- return 0;
- }
- sch->stats.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->stats.backlog += skb->len;
- return 0;
- }
- static struct sk_buff *
- bfifo_dequeue(struct Qdisc* sch)
- {
- struct sk_buff *skb;
- skb = __skb_dequeue(&sch->q);
- if (skb)
- sch->stats.backlog -= skb->len;
- return skb;
- }
- static int
- fifo_drop(struct Qdisc* sch)
- {
- struct sk_buff *skb;
- skb = __skb_dequeue_tail(&sch->q);
- if (skb) {
- sch->stats.backlog -= skb->len;
- kfree_skb(skb);
- return 1;
- }
- return 0;
- }
- static void
- fifo_reset(struct Qdisc* sch)
- {
- skb_queue_purge(&sch->q);
- sch->stats.backlog = 0;
- }
- static int
- pfifo_enqueue(struct sk_buff *skb, struct Qdisc* sch)
- {
- struct fifo_sched_data *q = (struct fifo_sched_data *)sch->data;
- if (sch->q.qlen <= q->limit) {
- __skb_queue_tail(&sch->q, skb);
- sch->stats.bytes += skb->len;
- sch->stats.packets++;
- return 0;
- }
- sch->stats.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);
- 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 = (void*)sch->data;
- if (opt == NULL) {
- if (sch->ops == &bfifo_qdisc_ops)
- q->limit = sch->dev->tx_queue_len*sch->dev->mtu;
- else
- q->limit = sch->dev->tx_queue_len;
- } 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 = (void*)sch->data;
- 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 =
- {
- NULL,
- NULL,
- "pfifo",
- sizeof(struct fifo_sched_data),
- pfifo_enqueue,
- pfifo_dequeue,
- pfifo_requeue,
- fifo_drop,
- fifo_init,
- fifo_reset,
- NULL,
- fifo_init,
- fifo_dump,
- };
- struct Qdisc_ops bfifo_qdisc_ops =
- {
- NULL,
- NULL,
- "bfifo",
- sizeof(struct fifo_sched_data),
- bfifo_enqueue,
- bfifo_dequeue,
- bfifo_requeue,
- fifo_drop,
- fifo_init,
- fifo_reset,
- NULL,
- fifo_init,
- fifo_dump,
- };