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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 | /* * 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 1; } sch->stats.drops++; #ifdef CONFIG_NET_CLS_POLICE if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch)) #endif kfree_skb(skb); return 0; } static int bfifo_requeue(struct sk_buff *skb, struct Qdisc* sch) { __skb_queue_head(&sch->q, skb); sch->stats.backlog += skb->len; return 1; } 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 1; } sch->stats.drops++; #ifdef CONFIG_NET_CLS_POLICE if (sch->reshape_fail==NULL || sch->reshape_fail(skb, sch)) #endif kfree_skb(skb); return 0; } static int pfifo_requeue(struct sk_buff *skb, struct Qdisc* sch) { __skb_queue_head(&sch->q, skb); return 1; } 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; } #ifdef CONFIG_RTNETLINK 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; } #endif 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, #ifdef CONFIG_RTNETLINK fifo_dump, #endif }; 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, #ifdef CONFIG_RTNETLINK fifo_dump, #endif }; |