openwrt/target/linux/package/ieee80211-dscape/src/fifo_qdisc.c

   1 /*
   2  * Copyright 2005, Devicescape Software, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * If building without CONFIG_NET_SCHED we need a simple
   9  * fifo qdisc to install by default as the sub-qdisc.
  10  * This is a simple replacement for sch_fifo.
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/version.h>
  15 #include <linux/netdevice.h>
  16 #include <net/ieee80211.h>
  17 #include "ieee80211_i.h"
  18 #include "wme.h"
  19
  20 static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc* qd)
  21 {
  22         struct sk_buff_head *q = qdisc_priv(qd);
  23
  24         if (skb_queue_len(q) > qd->dev->tx_queue_len) {
  25                 qd->qstats.drops++;
  26                 kfree_skb(skb);
  27                 return NET_XMIT_DROP;
  28         }
  29
  30         skb_queue_tail(q, skb);
  31         qd->q.qlen++;
  32         qd->bstats.bytes += skb->len;
  33         qd->bstats.packets++;
  34
  35         return NET_XMIT_SUCCESS;
  36 }
  37
  38
  39 static int pfifo_requeue(struct sk_buff *skb, struct Qdisc* qd)
  40 {
  41         struct sk_buff_head *q = qdisc_priv(qd);
  42
  43         skb_queue_head(q, skb);
  44         qd->q.qlen++;
  45         qd->bstats.bytes += skb->len;
  46         qd->bstats.packets++;
  47
  48         return NET_XMIT_SUCCESS;
  49 }
  50
  51
  52 static struct sk_buff *pfifo_dequeue(struct Qdisc* qd)
  53 {
  54         struct sk_buff_head *q = qdisc_priv(qd);
  55
  56         return skb_dequeue(q);
  57 }
  58
  59
  60 static int pfifo_init(struct Qdisc* qd, struct rtattr *opt)
  61 {
  62         struct sk_buff_head *q = qdisc_priv(qd);
  63
  64         skb_queue_head_init(q);
  65         return 0;
  66 }
  67
  68
  69 static void pfifo_reset(struct Qdisc* qd)
  70 {
  71         struct sk_buff_head *q = qdisc_priv(qd);
  72
  73         skb_queue_purge(q);
  74         qd->q.qlen = 0;
  75 }
  76
  77
  78 static int pfifo_dump(struct Qdisc *qd, struct sk_buff *skb)
  79 {
  80         return skb->len;
  81 }
  82
  83
  84 struct Qdisc_ops pfifo_qdisc_ops =
  85 {
  86         .next = NULL,
  87         .cl_ops = NULL,
  88         .id = "ieee80211_pfifo",
  89         .priv_size = sizeof(struct sk_buff_head),
  90
  91         .enqueue = pfifo_enqueue,
  92         .dequeue = pfifo_dequeue,
  93         .requeue = pfifo_requeue,
  94         .drop = NULL,
  95
  96         .init = pfifo_init,
  97         .reset = pfifo_reset,
  98         .destroy = NULL,
  99         .change = NULL,
 100
 101         .dump = pfifo_dump,
 102 };
 103