Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_red.c Random Early Detection queue. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | * Changes: |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 12 | * J Hadi Salim 980914: computation fixes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Alexey Makarenko <makar@phoenix.kharkov.ua> 990814: qave on idle link was calculated incorrectly. |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 14 | * J Hadi Salim 980816: ECN support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | */ |
| 16 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/types.h> |
| 19 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <net/pkt_sched.h> |
| 22 | #include <net/inet_ecn.h> |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 23 | #include <net/red.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 26 | /* Parameters, settable by user: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | ----------------------------- |
| 28 | |
| 29 | limit - bytes (must be > qth_max + burst) |
| 30 | |
| 31 | Hard limit on queue length, should be chosen >qth_max |
| 32 | to allow packet bursts. This parameter does not |
| 33 | affect the algorithms behaviour and can be chosen |
| 34 | arbitrarily high (well, less than ram size) |
| 35 | Really, this limit will never be reached |
| 36 | if RED works correctly. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | */ |
| 38 | |
| 39 | struct red_sched_data |
| 40 | { |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 41 | u32 limit; /* HARD maximal queue length */ |
| 42 | unsigned char flags; |
| 43 | struct red_parms parms; |
| 44 | struct red_stats stats; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 45 | struct Qdisc *qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | }; |
| 47 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 48 | static inline int red_use_ecn(struct red_sched_data *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 50 | return q->flags & TC_RED_ECN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | } |
| 52 | |
Thomas Graf | bdc450a | 2005-11-05 21:14:28 +0100 | [diff] [blame] | 53 | static inline int red_use_harddrop(struct red_sched_data *q) |
| 54 | { |
| 55 | return q->flags & TC_RED_HARDDROP; |
| 56 | } |
| 57 | |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 58 | static int red_enqueue(struct sk_buff *skb, struct Qdisc* sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 61 | struct Qdisc *child = q->qdisc; |
| 62 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 64 | q->parms.qavg = red_calc_qavg(&q->parms, child->qstats.backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 66 | if (red_is_idling(&q->parms)) |
| 67 | red_end_of_idle_period(&q->parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 69 | switch (red_action(&q->parms, q->parms.qavg)) { |
| 70 | case RED_DONT_MARK: |
| 71 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 73 | case RED_PROB_MARK: |
| 74 | sch->qstats.overlimits++; |
| 75 | if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) { |
| 76 | q->stats.prob_drop++; |
| 77 | goto congestion_drop; |
| 78 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 80 | q->stats.prob_mark++; |
| 81 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 83 | case RED_HARD_MARK: |
| 84 | sch->qstats.overlimits++; |
Thomas Graf | bdc450a | 2005-11-05 21:14:28 +0100 | [diff] [blame] | 85 | if (red_use_harddrop(q) || !red_use_ecn(q) || |
| 86 | !INET_ECN_set_ce(skb)) { |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 87 | q->stats.forced_drop++; |
| 88 | goto congestion_drop; |
| 89 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 91 | q->stats.forced_mark++; |
| 92 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 95 | ret = child->enqueue(skb, child); |
| 96 | if (likely(ret == NET_XMIT_SUCCESS)) { |
| 97 | sch->bstats.bytes += skb->len; |
| 98 | sch->bstats.packets++; |
| 99 | sch->q.qlen++; |
| 100 | } else { |
| 101 | q->stats.pdrop++; |
| 102 | sch->qstats.drops++; |
| 103 | } |
| 104 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 106 | congestion_drop: |
Thomas Graf | 9e178ff | 2005-11-05 21:14:06 +0100 | [diff] [blame] | 107 | qdisc_drop(skb, sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return NET_XMIT_CN; |
| 109 | } |
| 110 | |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 111 | static int red_requeue(struct sk_buff *skb, struct Qdisc* sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 114 | struct Qdisc *child = q->qdisc; |
| 115 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 117 | if (red_is_idling(&q->parms)) |
| 118 | red_end_of_idle_period(&q->parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 120 | ret = child->ops->requeue(skb, child); |
| 121 | if (likely(ret == NET_XMIT_SUCCESS)) { |
| 122 | sch->qstats.requeues++; |
| 123 | sch->q.qlen++; |
| 124 | } |
| 125 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 128 | static struct sk_buff * red_dequeue(struct Qdisc* sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
| 130 | struct sk_buff *skb; |
| 131 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 132 | struct Qdisc *child = q->qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 134 | skb = child->dequeue(child); |
| 135 | if (skb) |
| 136 | sch->q.qlen--; |
| 137 | else if (!red_is_idling(&q->parms)) |
Thomas Graf | 9e178ff | 2005-11-05 21:14:06 +0100 | [diff] [blame] | 138 | red_start_of_idle_period(&q->parms); |
| 139 | |
| 140 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | static unsigned int red_drop(struct Qdisc* sch) |
| 144 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 146 | struct Qdisc *child = q->qdisc; |
| 147 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 149 | if (child->ops->drop && (len = child->ops->drop(child)) > 0) { |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 150 | q->stats.other++; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 151 | sch->qstats.drops++; |
| 152 | sch->q.qlen--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | return len; |
| 154 | } |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 155 | |
Thomas Graf | 6a1b63d | 2005-11-05 21:14:07 +0100 | [diff] [blame] | 156 | if (!red_is_idling(&q->parms)) |
| 157 | red_start_of_idle_period(&q->parms); |
| 158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | static void red_reset(struct Qdisc* sch) |
| 163 | { |
| 164 | struct red_sched_data *q = qdisc_priv(sch); |
| 165 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 166 | qdisc_reset(q->qdisc); |
| 167 | sch->q.qlen = 0; |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 168 | red_restart(&q->parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 171 | static void red_destroy(struct Qdisc *sch) |
| 172 | { |
| 173 | struct red_sched_data *q = qdisc_priv(sch); |
| 174 | qdisc_destroy(q->qdisc); |
| 175 | } |
| 176 | |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 177 | static struct Qdisc *red_create_dflt(struct Qdisc *sch, u32 limit) |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 178 | { |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 179 | struct Qdisc *q; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 180 | struct rtattr *rta; |
| 181 | int ret; |
| 182 | |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 183 | q = qdisc_create_dflt(sch->dev, &bfifo_qdisc_ops, |
| 184 | TC_H_MAKE(sch->handle, 1)); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 185 | if (q) { |
| 186 | rta = kmalloc(RTA_LENGTH(sizeof(struct tc_fifo_qopt)), |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 187 | GFP_KERNEL); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 188 | if (rta) { |
| 189 | rta->rta_type = RTM_NEWQDISC; |
| 190 | rta->rta_len = RTA_LENGTH(sizeof(struct tc_fifo_qopt)); |
| 191 | ((struct tc_fifo_qopt *)RTA_DATA(rta))->limit = limit; |
| 192 | |
| 193 | ret = q->ops->change(q, rta); |
| 194 | kfree(rta); |
| 195 | |
| 196 | if (ret == 0) |
| 197 | return q; |
| 198 | } |
| 199 | qdisc_destroy(q); |
| 200 | } |
| 201 | return NULL; |
| 202 | } |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | static int red_change(struct Qdisc *sch, struct rtattr *opt) |
| 205 | { |
| 206 | struct red_sched_data *q = qdisc_priv(sch); |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 207 | struct rtattr *tb[TCA_RED_MAX]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | struct tc_red_qopt *ctl; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 209 | struct Qdisc *child = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 211 | if (opt == NULL || rtattr_parse_nested(tb, TCA_RED_MAX, opt)) |
| 212 | return -EINVAL; |
| 213 | |
| 214 | if (tb[TCA_RED_PARMS-1] == NULL || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | RTA_PAYLOAD(tb[TCA_RED_PARMS-1]) < sizeof(*ctl) || |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 216 | tb[TCA_RED_STAB-1] == NULL || |
| 217 | RTA_PAYLOAD(tb[TCA_RED_STAB-1]) < RED_STAB_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | return -EINVAL; |
| 219 | |
| 220 | ctl = RTA_DATA(tb[TCA_RED_PARMS-1]); |
| 221 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 222 | if (ctl->limit > 0) { |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 223 | child = red_create_dflt(sch, ctl->limit); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 224 | if (child == NULL) |
| 225 | return -ENOMEM; |
| 226 | } |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | sch_tree_lock(sch); |
| 229 | q->flags = ctl->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | q->limit = ctl->limit; |
Patrick McHardy | 5e50da0 | 2006-11-29 17:36:20 -0800 | [diff] [blame] | 231 | if (child) { |
| 232 | qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 233 | qdisc_destroy(xchg(&q->qdisc, child)); |
Patrick McHardy | 5e50da0 | 2006-11-29 17:36:20 -0800 | [diff] [blame] | 234 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 236 | red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog, |
| 237 | ctl->Plog, ctl->Scell_log, |
| 238 | RTA_DATA(tb[TCA_RED_STAB-1])); |
| 239 | |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 240 | if (skb_queue_empty(&sch->q)) |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 241 | red_end_of_idle_period(&q->parms); |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | sch_tree_unlock(sch); |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static int red_init(struct Qdisc* sch, struct rtattr *opt) |
| 248 | { |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 249 | struct red_sched_data *q = qdisc_priv(sch); |
| 250 | |
| 251 | q->qdisc = &noop_qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return red_change(sch, opt); |
| 253 | } |
| 254 | |
| 255 | static int red_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 256 | { |
| 257 | struct red_sched_data *q = qdisc_priv(sch); |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 258 | struct rtattr *opts = NULL; |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 259 | struct tc_red_qopt opt = { |
| 260 | .limit = q->limit, |
| 261 | .flags = q->flags, |
| 262 | .qth_min = q->parms.qth_min >> q->parms.Wlog, |
| 263 | .qth_max = q->parms.qth_max >> q->parms.Wlog, |
| 264 | .Wlog = q->parms.Wlog, |
| 265 | .Plog = q->parms.Plog, |
| 266 | .Scell_log = q->parms.Scell_log, |
| 267 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 269 | opts = RTA_NEST(skb, TCA_OPTIONS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | RTA_PUT(skb, TCA_RED_PARMS, sizeof(opt), &opt); |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 271 | return RTA_NEST_END(skb, opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | rtattr_failure: |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 274 | return RTA_NEST_CANCEL(skb, opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | } |
| 276 | |
| 277 | static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d) |
| 278 | { |
| 279 | struct red_sched_data *q = qdisc_priv(sch); |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 280 | struct tc_red_xstats st = { |
| 281 | .early = q->stats.prob_drop + q->stats.forced_drop, |
| 282 | .pdrop = q->stats.pdrop, |
| 283 | .other = q->stats.other, |
| 284 | .marked = q->stats.prob_mark + q->stats.forced_mark, |
| 285 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 287 | return gnet_stats_copy_app(d, &st, sizeof(st)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 290 | static int red_dump_class(struct Qdisc *sch, unsigned long cl, |
| 291 | struct sk_buff *skb, struct tcmsg *tcm) |
| 292 | { |
| 293 | struct red_sched_data *q = qdisc_priv(sch); |
| 294 | |
| 295 | if (cl != 1) |
| 296 | return -ENOENT; |
| 297 | tcm->tcm_handle |= TC_H_MIN(1); |
| 298 | tcm->tcm_info = q->qdisc->handle; |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
| 303 | struct Qdisc **old) |
| 304 | { |
| 305 | struct red_sched_data *q = qdisc_priv(sch); |
| 306 | |
| 307 | if (new == NULL) |
| 308 | new = &noop_qdisc; |
| 309 | |
| 310 | sch_tree_lock(sch); |
| 311 | *old = xchg(&q->qdisc, new); |
Patrick McHardy | 5e50da0 | 2006-11-29 17:36:20 -0800 | [diff] [blame] | 312 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 313 | qdisc_reset(*old); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 314 | sch_tree_unlock(sch); |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg) |
| 319 | { |
| 320 | struct red_sched_data *q = qdisc_priv(sch); |
| 321 | return q->qdisc; |
| 322 | } |
| 323 | |
| 324 | static unsigned long red_get(struct Qdisc *sch, u32 classid) |
| 325 | { |
| 326 | return 1; |
| 327 | } |
| 328 | |
| 329 | static void red_put(struct Qdisc *sch, unsigned long arg) |
| 330 | { |
| 331 | return; |
| 332 | } |
| 333 | |
| 334 | static int red_change_class(struct Qdisc *sch, u32 classid, u32 parentid, |
| 335 | struct rtattr **tca, unsigned long *arg) |
| 336 | { |
| 337 | return -ENOSYS; |
| 338 | } |
| 339 | |
| 340 | static int red_delete(struct Qdisc *sch, unsigned long cl) |
| 341 | { |
| 342 | return -ENOSYS; |
| 343 | } |
| 344 | |
| 345 | static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
| 346 | { |
| 347 | if (!walker->stop) { |
| 348 | if (walker->count >= walker->skip) |
| 349 | if (walker->fn(sch, 1, walker) < 0) { |
| 350 | walker->stop = 1; |
| 351 | return; |
| 352 | } |
| 353 | walker->count++; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | static struct tcf_proto **red_find_tcf(struct Qdisc *sch, unsigned long cl) |
| 358 | { |
| 359 | return NULL; |
| 360 | } |
| 361 | |
| 362 | static struct Qdisc_class_ops red_class_ops = { |
| 363 | .graft = red_graft, |
| 364 | .leaf = red_leaf, |
| 365 | .get = red_get, |
| 366 | .put = red_put, |
| 367 | .change = red_change_class, |
| 368 | .delete = red_delete, |
| 369 | .walk = red_walk, |
| 370 | .tcf_chain = red_find_tcf, |
| 371 | .dump = red_dump_class, |
| 372 | }; |
| 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | static struct Qdisc_ops red_qdisc_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | .id = "red", |
| 376 | .priv_size = sizeof(struct red_sched_data), |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 377 | .cl_ops = &red_class_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | .enqueue = red_enqueue, |
| 379 | .dequeue = red_dequeue, |
| 380 | .requeue = red_requeue, |
| 381 | .drop = red_drop, |
| 382 | .init = red_init, |
| 383 | .reset = red_reset, |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 384 | .destroy = red_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | .change = red_change, |
| 386 | .dump = red_dump, |
| 387 | .dump_stats = red_dump_stats, |
| 388 | .owner = THIS_MODULE, |
| 389 | }; |
| 390 | |
| 391 | static int __init red_module_init(void) |
| 392 | { |
| 393 | return register_qdisc(&red_qdisc_ops); |
| 394 | } |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 395 | |
| 396 | static void __exit red_module_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
| 398 | unregister_qdisc(&red_qdisc_ops); |
| 399 | } |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | module_init(red_module_init) |
| 402 | module_exit(red_module_exit) |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | MODULE_LICENSE("GPL"); |