Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_netem.c Network emulator |
| 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 |
Stephen Hemminger | 798b6b1 | 2006-10-22 20:16:57 -0700 | [diff] [blame] | 7 | * 2 of the License. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * Many of the algorithms and ideas for this came from |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 10 | * NIST Net which is not copyrighted. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * Authors: Stephen Hemminger <shemminger@osdl.org> |
| 13 | * Catalin(ux aka Dino) BOIE <catab at umbrella dot ro> |
| 14 | */ |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/types.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/skbuff.h> |
| 21 | #include <linux/rtnetlink.h> |
| 22 | |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 23 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <net/pkt_sched.h> |
| 25 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 26 | #define VERSION "1.2" |
Stephen Hemminger | eb229c4 | 2005-11-03 13:49:01 -0800 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | /* Network Emulation Queuing algorithm. |
| 29 | ==================================== |
| 30 | |
| 31 | Sources: [1] Mark Carson, Darrin Santay, "NIST Net - A Linux-based |
| 32 | Network Emulation Tool |
| 33 | [2] Luigi Rizzo, DummyNet for FreeBSD |
| 34 | |
| 35 | ---------------------------------------------------------------- |
| 36 | |
| 37 | This started out as a simple way to delay outgoing packets to |
| 38 | test TCP but has grown to include most of the functionality |
| 39 | of a full blown network emulator like NISTnet. It can delay |
| 40 | packets and add random jitter (and correlation). The random |
| 41 | distribution can be loaded from a table as well to provide |
| 42 | normal, Pareto, or experimental curves. Packet loss, |
| 43 | duplication, and reordering can also be emulated. |
| 44 | |
| 45 | This qdisc does not do classification that can be handled in |
| 46 | layering other disciplines. It does not need to do bandwidth |
| 47 | control either since that can be handled by using token |
| 48 | bucket or other rate control. |
| 49 | |
| 50 | The simulator is limited by the Linux timer resolution |
| 51 | and will create packet bursts on the HZ boundary (1ms). |
| 52 | */ |
| 53 | |
| 54 | struct netem_sched_data { |
| 55 | struct Qdisc *qdisc; |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 56 | struct qdisc_watchdog watchdog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 58 | psched_tdiff_t latency; |
| 59 | psched_tdiff_t jitter; |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | u32 loss; |
| 62 | u32 limit; |
| 63 | u32 counter; |
| 64 | u32 gap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | u32 duplicate; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 66 | u32 reorder; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 67 | u32 corrupt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | struct crndstate { |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 70 | u32 last; |
| 71 | u32 rho; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 72 | } delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | struct disttable { |
| 75 | u32 size; |
| 76 | s16 table[0]; |
| 77 | } *delay_dist; |
| 78 | }; |
| 79 | |
| 80 | /* Time stamp put into socket buffer control block */ |
| 81 | struct netem_skb_cb { |
| 82 | psched_time_t time_to_send; |
| 83 | }; |
| 84 | |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 85 | static inline struct netem_skb_cb *netem_skb_cb(struct sk_buff *skb) |
| 86 | { |
| 87 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct netem_skb_cb)); |
| 88 | return (struct netem_skb_cb *)skb->cb; |
| 89 | } |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | /* init_crandom - initialize correlated random number generator |
| 92 | * Use entropy source for initial seed. |
| 93 | */ |
| 94 | static void init_crandom(struct crndstate *state, unsigned long rho) |
| 95 | { |
| 96 | state->rho = rho; |
| 97 | state->last = net_random(); |
| 98 | } |
| 99 | |
| 100 | /* get_crandom - correlated random number generator |
| 101 | * Next number depends on last value. |
| 102 | * rho is scaled to avoid floating point. |
| 103 | */ |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 104 | static u32 get_crandom(struct crndstate *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
| 106 | u64 value, rho; |
| 107 | unsigned long answer; |
| 108 | |
Stephen Hemminger | bb2f8cc | 2007-03-23 00:12:09 -0700 | [diff] [blame] | 109 | if (state->rho == 0) /* no correlation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return net_random(); |
| 111 | |
| 112 | value = net_random(); |
| 113 | rho = (u64)state->rho + 1; |
| 114 | answer = (value * ((1ull<<32) - rho) + state->last * rho) >> 32; |
| 115 | state->last = answer; |
| 116 | return answer; |
| 117 | } |
| 118 | |
| 119 | /* tabledist - return a pseudo-randomly distributed value with mean mu and |
| 120 | * std deviation sigma. Uses table lookup to approximate the desired |
| 121 | * distribution, and a uniformly-distributed pseudo-random source. |
| 122 | */ |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 123 | static psched_tdiff_t tabledist(psched_tdiff_t mu, psched_tdiff_t sigma, |
| 124 | struct crndstate *state, |
| 125 | const struct disttable *dist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | { |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 127 | psched_tdiff_t x; |
| 128 | long t; |
| 129 | u32 rnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | if (sigma == 0) |
| 132 | return mu; |
| 133 | |
| 134 | rnd = get_crandom(state); |
| 135 | |
| 136 | /* default uniform distribution */ |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 137 | if (dist == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return (rnd % (2*sigma)) - sigma + mu; |
| 139 | |
| 140 | t = dist->table[rnd % dist->size]; |
| 141 | x = (sigma % NETEM_DIST_SCALE) * t; |
| 142 | if (x >= 0) |
| 143 | x += NETEM_DIST_SCALE/2; |
| 144 | else |
| 145 | x -= NETEM_DIST_SCALE/2; |
| 146 | |
| 147 | return x / NETEM_DIST_SCALE + (sigma / NETEM_DIST_SCALE) * t + mu; |
| 148 | } |
| 149 | |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 150 | /* |
| 151 | * Insert one skb into qdisc. |
| 152 | * Note: parent depends on return value to account for queue length. |
| 153 | * NET_XMIT_DROP: queue length didn't change. |
| 154 | * NET_XMIT_SUCCESS: one skb was queued. |
| 155 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
| 157 | { |
| 158 | struct netem_sched_data *q = qdisc_priv(sch); |
Guillaume Chazarain | 89e1df7 | 2006-07-21 14:45:25 -0700 | [diff] [blame] | 159 | /* We don't fill cb now as skb_unshare() may invalidate it */ |
| 160 | struct netem_skb_cb *cb; |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 161 | struct sk_buff *skb2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | int ret; |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 163 | int count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Stephen Hemminger | 771018e | 2005-05-03 16:24:32 -0700 | [diff] [blame] | 165 | pr_debug("netem_enqueue skb=%p\n", skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 167 | /* Random duplication */ |
| 168 | if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)) |
| 169 | ++count; |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* Random packet drop 0 => none, ~0 => all */ |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 172 | if (q->loss && q->loss >= get_crandom(&q->loss_cor)) |
| 173 | --count; |
| 174 | |
| 175 | if (count == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | sch->qstats.drops++; |
| 177 | kfree_skb(skb); |
Stephen Hemminger | 89bbb0a3 | 2006-04-28 12:11:36 -0700 | [diff] [blame] | 178 | return NET_XMIT_BYPASS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
David S. Miller | 4e8a520 | 2006-10-22 21:00:33 -0700 | [diff] [blame] | 181 | skb_orphan(skb); |
| 182 | |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 183 | /* |
| 184 | * If we need to duplicate packet, then re-insert at top of the |
| 185 | * qdisc tree, since parent queuer expects that only one |
| 186 | * skb will be queued. |
| 187 | */ |
| 188 | if (count > 1 && (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) { |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 189 | struct Qdisc *rootq = qdisc_root(sch); |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 190 | u32 dupsave = q->duplicate; /* prevent duplicating a dup... */ |
| 191 | q->duplicate = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 193 | qdisc_enqueue_root(skb2, rootq); |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 194 | q->duplicate = dupsave; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 197 | /* |
| 198 | * Randomized packet corruption. |
| 199 | * Make copy if needed since we are modifying |
| 200 | * If packet is going to be hardware checksummed, then |
| 201 | * do it now in software before we mangle it. |
| 202 | */ |
| 203 | if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) { |
| 204 | if (!(skb = skb_unshare(skb, GFP_ATOMIC)) |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 205 | || (skb->ip_summed == CHECKSUM_PARTIAL |
| 206 | && skb_checksum_help(skb))) { |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 207 | sch->qstats.drops++; |
| 208 | return NET_XMIT_DROP; |
| 209 | } |
| 210 | |
| 211 | skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8); |
| 212 | } |
| 213 | |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 214 | cb = netem_skb_cb(skb); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 215 | if (q->gap == 0 /* not doing reordering */ |
| 216 | || q->counter < q->gap /* inside last reordering gap */ |
| 217 | || q->reorder < get_crandom(&q->reorder_cor)) { |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 218 | psched_time_t now; |
Stephen Hemminger | 07aaa11 | 2005-11-03 13:43:07 -0800 | [diff] [blame] | 219 | psched_tdiff_t delay; |
| 220 | |
| 221 | delay = tabledist(q->latency, q->jitter, |
| 222 | &q->delay_cor, q->delay_dist); |
| 223 | |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 224 | now = psched_get_time(); |
Patrick McHardy | 7c59e25 | 2007-03-23 11:27:45 -0700 | [diff] [blame] | 225 | cb->time_to_send = now + delay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | ++q->counter; |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 227 | ret = qdisc_enqueue(skb, q->qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } else { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 229 | /* |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 230 | * Do re-ordering by putting one out of N packets at the front |
| 231 | * of the queue. |
| 232 | */ |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 233 | cb->time_to_send = psched_get_time(); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 234 | q->counter = 0; |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 235 | ret = q->qdisc->ops->requeue(skb, q->qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | if (likely(ret == NET_XMIT_SUCCESS)) { |
| 239 | sch->q.qlen++; |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame^] | 240 | sch->bstats.bytes += qdisc_pkt_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | sch->bstats.packets++; |
| 242 | } else |
| 243 | sch->qstats.drops++; |
| 244 | |
Stephen Hemminger | d5d75cd | 2005-05-03 16:24:57 -0700 | [diff] [blame] | 245 | pr_debug("netem: enqueue ret %d\n", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | return ret; |
| 247 | } |
| 248 | |
| 249 | /* Requeue packets but don't change time stamp */ |
| 250 | static int netem_requeue(struct sk_buff *skb, struct Qdisc *sch) |
| 251 | { |
| 252 | struct netem_sched_data *q = qdisc_priv(sch); |
| 253 | int ret; |
| 254 | |
| 255 | if ((ret = q->qdisc->ops->requeue(skb, q->qdisc)) == 0) { |
| 256 | sch->q.qlen++; |
| 257 | sch->qstats.requeues++; |
| 258 | } |
| 259 | |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | static unsigned int netem_drop(struct Qdisc* sch) |
| 264 | { |
| 265 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 6d037a2 | 2006-03-20 19:00:49 -0800 | [diff] [blame] | 266 | unsigned int len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Patrick McHardy | 6d037a2 | 2006-03-20 19:00:49 -0800 | [diff] [blame] | 268 | if (q->qdisc->ops->drop && (len = q->qdisc->ops->drop(q->qdisc)) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | sch->q.qlen--; |
| 270 | sch->qstats.drops++; |
| 271 | } |
| 272 | return len; |
| 273 | } |
| 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | static struct sk_buff *netem_dequeue(struct Qdisc *sch) |
| 276 | { |
| 277 | struct netem_sched_data *q = qdisc_priv(sch); |
| 278 | struct sk_buff *skb; |
| 279 | |
Stephen Hemminger | 11274e5 | 2007-03-22 12:17:42 -0700 | [diff] [blame] | 280 | smp_mb(); |
| 281 | if (sch->flags & TCQ_F_THROTTLED) |
| 282 | return NULL; |
| 283 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | skb = q->qdisc->dequeue(q->qdisc); |
Stephen Hemminger | 771018e | 2005-05-03 16:24:32 -0700 | [diff] [blame] | 285 | if (skb) { |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 286 | const struct netem_skb_cb *cb = netem_skb_cb(skb); |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 287 | psched_time_t now = psched_get_time(); |
Stephen Hemminger | 771018e | 2005-05-03 16:24:32 -0700 | [diff] [blame] | 288 | |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 289 | /* if more time remaining? */ |
Patrick McHardy | 104e087 | 2007-03-23 11:28:07 -0700 | [diff] [blame] | 290 | if (cb->time_to_send <= now) { |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 291 | pr_debug("netem_dequeue: return skb=%p\n", skb); |
| 292 | sch->q.qlen--; |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 293 | return skb; |
| 294 | } |
Stephen Hemminger | 11274e5 | 2007-03-22 12:17:42 -0700 | [diff] [blame] | 295 | |
| 296 | if (unlikely(q->qdisc->ops->requeue(skb, q->qdisc) != NET_XMIT_SUCCESS)) { |
| 297 | qdisc_tree_decrease_qlen(q->qdisc, 1); |
| 298 | sch->qstats.drops++; |
| 299 | printk(KERN_ERR "netem: %s could not requeue\n", |
| 300 | q->qdisc->ops->id); |
| 301 | } |
| 302 | |
| 303 | qdisc_watchdog_schedule(&q->watchdog, cb->time_to_send); |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | static void netem_reset(struct Qdisc *sch) |
| 310 | { |
| 311 | struct netem_sched_data *q = qdisc_priv(sch); |
| 312 | |
| 313 | qdisc_reset(q->qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | sch->q.qlen = 0; |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 315 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | /* |
| 319 | * Distribution data is a variable size payload containing |
| 320 | * signed 16 bit values. |
| 321 | */ |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 322 | static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | { |
| 324 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 325 | unsigned long n = nla_len(attr)/sizeof(__s16); |
| 326 | const __s16 *data = nla_data(attr); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 327 | spinlock_t *root_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | struct disttable *d; |
| 329 | int i; |
| 330 | |
| 331 | if (n > 65536) |
| 332 | return -EINVAL; |
| 333 | |
| 334 | d = kmalloc(sizeof(*d) + n*sizeof(d->table[0]), GFP_KERNEL); |
| 335 | if (!d) |
| 336 | return -ENOMEM; |
| 337 | |
| 338 | d->size = n; |
| 339 | for (i = 0; i < n; i++) |
| 340 | d->table[i] = data[i]; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 341 | |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 342 | root_lock = qdisc_root_lock(sch); |
| 343 | |
| 344 | spin_lock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | d = xchg(&q->delay_dist, d); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 346 | spin_unlock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | kfree(d); |
| 349 | return 0; |
| 350 | } |
| 351 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 352 | static int get_correlation(struct Qdisc *sch, const struct nlattr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | { |
| 354 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 355 | const struct tc_netem_corr *c = nla_data(attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | init_crandom(&q->delay_cor, c->delay_corr); |
| 358 | init_crandom(&q->loss_cor, c->loss_corr); |
| 359 | init_crandom(&q->dup_cor, c->dup_corr); |
| 360 | return 0; |
| 361 | } |
| 362 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 363 | static int get_reorder(struct Qdisc *sch, const struct nlattr *attr) |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 364 | { |
| 365 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 366 | const struct tc_netem_reorder *r = nla_data(attr); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 367 | |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 368 | q->reorder = r->probability; |
| 369 | init_crandom(&q->reorder_cor, r->correlation); |
| 370 | return 0; |
| 371 | } |
| 372 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 373 | static int get_corrupt(struct Qdisc *sch, const struct nlattr *attr) |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 374 | { |
| 375 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 376 | const struct tc_netem_corrupt *r = nla_data(attr); |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 377 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 378 | q->corrupt = r->probability; |
| 379 | init_crandom(&q->corrupt_cor, r->correlation); |
| 380 | return 0; |
| 381 | } |
| 382 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 383 | static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = { |
| 384 | [TCA_NETEM_CORR] = { .len = sizeof(struct tc_netem_corr) }, |
| 385 | [TCA_NETEM_REORDER] = { .len = sizeof(struct tc_netem_reorder) }, |
| 386 | [TCA_NETEM_CORRUPT] = { .len = sizeof(struct tc_netem_corrupt) }, |
| 387 | }; |
| 388 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 389 | /* Parse netlink message to set options */ |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 390 | static int netem_change(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | { |
| 392 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 393 | struct nlattr *tb[TCA_NETEM_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | struct tc_netem_qopt *qopt; |
| 395 | int ret; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 396 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 397 | if (opt == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | return -EINVAL; |
| 399 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 400 | ret = nla_parse_nested_compat(tb, TCA_NETEM_MAX, opt, netem_policy, |
| 401 | qopt, sizeof(*qopt)); |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 402 | if (ret < 0) |
| 403 | return ret; |
| 404 | |
Patrick McHardy | fb0305c | 2008-07-05 23:40:21 -0700 | [diff] [blame] | 405 | ret = fifo_set_limit(q->qdisc, qopt->limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if (ret) { |
| 407 | pr_debug("netem: can't set fifo limit\n"); |
| 408 | return ret; |
| 409 | } |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | q->latency = qopt->latency; |
| 412 | q->jitter = qopt->jitter; |
| 413 | q->limit = qopt->limit; |
| 414 | q->gap = qopt->gap; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 415 | q->counter = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | q->loss = qopt->loss; |
| 417 | q->duplicate = qopt->duplicate; |
| 418 | |
Stephen Hemminger | bb2f8cc | 2007-03-23 00:12:09 -0700 | [diff] [blame] | 419 | /* for compatibility with earlier versions. |
| 420 | * if gap is set, need to assume 100% probability |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 421 | */ |
Stephen Hemminger | a362e0a | 2007-03-22 12:15:45 -0700 | [diff] [blame] | 422 | if (q->gap) |
| 423 | q->reorder = ~0; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 424 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 425 | if (tb[TCA_NETEM_CORR]) { |
| 426 | ret = get_correlation(sch, tb[TCA_NETEM_CORR]); |
| 427 | if (ret) |
| 428 | return ret; |
| 429 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 431 | if (tb[TCA_NETEM_DELAY_DIST]) { |
| 432 | ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST]); |
| 433 | if (ret) |
| 434 | return ret; |
| 435 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 437 | if (tb[TCA_NETEM_REORDER]) { |
| 438 | ret = get_reorder(sch, tb[TCA_NETEM_REORDER]); |
| 439 | if (ret) |
| 440 | return ret; |
| 441 | } |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 442 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 443 | if (tb[TCA_NETEM_CORRUPT]) { |
| 444 | ret = get_corrupt(sch, tb[TCA_NETEM_CORRUPT]); |
| 445 | if (ret) |
| 446 | return ret; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 447 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 452 | /* |
| 453 | * Special case version of FIFO queue for use by netem. |
| 454 | * It queues in order based on timestamps in skb's |
| 455 | */ |
| 456 | struct fifo_sched_data { |
| 457 | u32 limit; |
Stephen Hemminger | 075aa57 | 2007-03-22 12:17:05 -0700 | [diff] [blame] | 458 | psched_time_t oldest; |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 459 | }; |
| 460 | |
| 461 | static int tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch) |
| 462 | { |
| 463 | struct fifo_sched_data *q = qdisc_priv(sch); |
| 464 | struct sk_buff_head *list = &sch->q; |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 465 | psched_time_t tnext = netem_skb_cb(nskb)->time_to_send; |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 466 | struct sk_buff *skb; |
| 467 | |
| 468 | if (likely(skb_queue_len(list) < q->limit)) { |
Stephen Hemminger | 075aa57 | 2007-03-22 12:17:05 -0700 | [diff] [blame] | 469 | /* Optimize for add at tail */ |
Patrick McHardy | 104e087 | 2007-03-23 11:28:07 -0700 | [diff] [blame] | 470 | if (likely(skb_queue_empty(list) || tnext >= q->oldest)) { |
Stephen Hemminger | 075aa57 | 2007-03-22 12:17:05 -0700 | [diff] [blame] | 471 | q->oldest = tnext; |
| 472 | return qdisc_enqueue_tail(nskb, sch); |
| 473 | } |
| 474 | |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 475 | skb_queue_reverse_walk(list, skb) { |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 476 | const struct netem_skb_cb *cb = netem_skb_cb(skb); |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 477 | |
Patrick McHardy | 104e087 | 2007-03-23 11:28:07 -0700 | [diff] [blame] | 478 | if (tnext >= cb->time_to_send) |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 479 | break; |
| 480 | } |
| 481 | |
| 482 | __skb_queue_after(list, skb, nskb); |
| 483 | |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame^] | 484 | sch->qstats.backlog += qdisc_pkt_len(nskb); |
| 485 | sch->bstats.bytes += qdisc_pkt_len(nskb); |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 486 | sch->bstats.packets++; |
| 487 | |
| 488 | return NET_XMIT_SUCCESS; |
| 489 | } |
| 490 | |
Stephen Hemminger | 075aa57 | 2007-03-22 12:17:05 -0700 | [diff] [blame] | 491 | return qdisc_reshape_fail(nskb, sch); |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 492 | } |
| 493 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 494 | static int tfifo_init(struct Qdisc *sch, struct nlattr *opt) |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 495 | { |
| 496 | struct fifo_sched_data *q = qdisc_priv(sch); |
| 497 | |
| 498 | if (opt) { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 499 | struct tc_fifo_qopt *ctl = nla_data(opt); |
| 500 | if (nla_len(opt) < sizeof(*ctl)) |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 501 | return -EINVAL; |
| 502 | |
| 503 | q->limit = ctl->limit; |
| 504 | } else |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 505 | q->limit = max_t(u32, qdisc_dev(sch)->tx_queue_len, 1); |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 506 | |
Patrick McHardy | a084980 | 2007-03-23 11:28:30 -0700 | [diff] [blame] | 507 | q->oldest = PSCHED_PASTPERFECT; |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | static int tfifo_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 512 | { |
| 513 | struct fifo_sched_data *q = qdisc_priv(sch); |
| 514 | struct tc_fifo_qopt opt = { .limit = q->limit }; |
| 515 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 516 | NLA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt); |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 517 | return skb->len; |
| 518 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 519 | nla_put_failure: |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 520 | return -1; |
| 521 | } |
| 522 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 523 | static struct Qdisc_ops tfifo_qdisc_ops __read_mostly = { |
Stephen Hemminger | 300ce17 | 2005-10-30 13:47:34 -0800 | [diff] [blame] | 524 | .id = "tfifo", |
| 525 | .priv_size = sizeof(struct fifo_sched_data), |
| 526 | .enqueue = tfifo_enqueue, |
| 527 | .dequeue = qdisc_dequeue_head, |
| 528 | .requeue = qdisc_requeue, |
| 529 | .drop = qdisc_queue_drop, |
| 530 | .init = tfifo_init, |
| 531 | .reset = qdisc_reset_queue, |
| 532 | .change = tfifo_init, |
| 533 | .dump = tfifo_dump, |
| 534 | }; |
| 535 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 536 | static int netem_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | { |
| 538 | struct netem_sched_data *q = qdisc_priv(sch); |
| 539 | int ret; |
| 540 | |
| 541 | if (!opt) |
| 542 | return -EINVAL; |
| 543 | |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 544 | qdisc_watchdog_init(&q->watchdog, sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 546 | q->qdisc = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue, |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 547 | &tfifo_qdisc_ops, |
Patrick McHardy | 9f9afec | 2006-11-29 17:35:18 -0800 | [diff] [blame] | 548 | TC_H_MAKE(sch->handle, 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | if (!q->qdisc) { |
| 550 | pr_debug("netem: qdisc create failed\n"); |
| 551 | return -ENOMEM; |
| 552 | } |
| 553 | |
| 554 | ret = netem_change(sch, opt); |
| 555 | if (ret) { |
| 556 | pr_debug("netem: change failed\n"); |
| 557 | qdisc_destroy(q->qdisc); |
| 558 | } |
| 559 | return ret; |
| 560 | } |
| 561 | |
| 562 | static void netem_destroy(struct Qdisc *sch) |
| 563 | { |
| 564 | struct netem_sched_data *q = qdisc_priv(sch); |
| 565 | |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 566 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | qdisc_destroy(q->qdisc); |
| 568 | kfree(q->delay_dist); |
| 569 | } |
| 570 | |
| 571 | static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 572 | { |
| 573 | const struct netem_sched_data *q = qdisc_priv(sch); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 574 | unsigned char *b = skb_tail_pointer(skb); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 575 | struct nlattr *nla = (struct nlattr *) b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | struct tc_netem_qopt qopt; |
| 577 | struct tc_netem_corr cor; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 578 | struct tc_netem_reorder reorder; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 579 | struct tc_netem_corrupt corrupt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
| 581 | qopt.latency = q->latency; |
| 582 | qopt.jitter = q->jitter; |
| 583 | qopt.limit = q->limit; |
| 584 | qopt.loss = q->loss; |
| 585 | qopt.gap = q->gap; |
| 586 | qopt.duplicate = q->duplicate; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 587 | NLA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
| 589 | cor.delay_corr = q->delay_cor.rho; |
| 590 | cor.loss_corr = q->loss_cor.rho; |
| 591 | cor.dup_corr = q->dup_cor.rho; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 592 | NLA_PUT(skb, TCA_NETEM_CORR, sizeof(cor), &cor); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 593 | |
| 594 | reorder.probability = q->reorder; |
| 595 | reorder.correlation = q->reorder_cor.rho; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 596 | NLA_PUT(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 597 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 598 | corrupt.probability = q->corrupt; |
| 599 | corrupt.correlation = q->corrupt_cor.rho; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 600 | NLA_PUT(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt); |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 601 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 602 | nla->nla_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | return skb->len; |
| 605 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 606 | nla_put_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 607 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | return -1; |
| 609 | } |
| 610 | |
| 611 | static int netem_dump_class(struct Qdisc *sch, unsigned long cl, |
| 612 | struct sk_buff *skb, struct tcmsg *tcm) |
| 613 | { |
| 614 | struct netem_sched_data *q = qdisc_priv(sch); |
| 615 | |
| 616 | if (cl != 1) /* only one class */ |
| 617 | return -ENOENT; |
| 618 | |
| 619 | tcm->tcm_handle |= TC_H_MIN(1); |
| 620 | tcm->tcm_info = q->qdisc->handle; |
| 621 | |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
| 626 | struct Qdisc **old) |
| 627 | { |
| 628 | struct netem_sched_data *q = qdisc_priv(sch); |
| 629 | |
| 630 | if (new == NULL) |
| 631 | new = &noop_qdisc; |
| 632 | |
| 633 | sch_tree_lock(sch); |
| 634 | *old = xchg(&q->qdisc, new); |
Patrick McHardy | 5e50da0 | 2006-11-29 17:36:20 -0800 | [diff] [blame] | 635 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | qdisc_reset(*old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | sch_tree_unlock(sch); |
| 638 | |
| 639 | return 0; |
| 640 | } |
| 641 | |
| 642 | static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg) |
| 643 | { |
| 644 | struct netem_sched_data *q = qdisc_priv(sch); |
| 645 | return q->qdisc; |
| 646 | } |
| 647 | |
| 648 | static unsigned long netem_get(struct Qdisc *sch, u32 classid) |
| 649 | { |
| 650 | return 1; |
| 651 | } |
| 652 | |
| 653 | static void netem_put(struct Qdisc *sch, unsigned long arg) |
| 654 | { |
| 655 | } |
| 656 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 657 | static int netem_change_class(struct Qdisc *sch, u32 classid, u32 parentid, |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 658 | struct nlattr **tca, unsigned long *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | { |
| 660 | return -ENOSYS; |
| 661 | } |
| 662 | |
| 663 | static int netem_delete(struct Qdisc *sch, unsigned long arg) |
| 664 | { |
| 665 | return -ENOSYS; |
| 666 | } |
| 667 | |
| 668 | static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
| 669 | { |
| 670 | if (!walker->stop) { |
| 671 | if (walker->count >= walker->skip) |
| 672 | if (walker->fn(sch, 1, walker) < 0) { |
| 673 | walker->stop = 1; |
| 674 | return; |
| 675 | } |
| 676 | walker->count++; |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | static struct tcf_proto **netem_find_tcf(struct Qdisc *sch, unsigned long cl) |
| 681 | { |
| 682 | return NULL; |
| 683 | } |
| 684 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 685 | static const struct Qdisc_class_ops netem_class_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | .graft = netem_graft, |
| 687 | .leaf = netem_leaf, |
| 688 | .get = netem_get, |
| 689 | .put = netem_put, |
| 690 | .change = netem_change_class, |
| 691 | .delete = netem_delete, |
| 692 | .walk = netem_walk, |
| 693 | .tcf_chain = netem_find_tcf, |
| 694 | .dump = netem_dump_class, |
| 695 | }; |
| 696 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 697 | static struct Qdisc_ops netem_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | .id = "netem", |
| 699 | .cl_ops = &netem_class_ops, |
| 700 | .priv_size = sizeof(struct netem_sched_data), |
| 701 | .enqueue = netem_enqueue, |
| 702 | .dequeue = netem_dequeue, |
| 703 | .requeue = netem_requeue, |
| 704 | .drop = netem_drop, |
| 705 | .init = netem_init, |
| 706 | .reset = netem_reset, |
| 707 | .destroy = netem_destroy, |
| 708 | .change = netem_change, |
| 709 | .dump = netem_dump, |
| 710 | .owner = THIS_MODULE, |
| 711 | }; |
| 712 | |
| 713 | |
| 714 | static int __init netem_module_init(void) |
| 715 | { |
Stephen Hemminger | eb229c4 | 2005-11-03 13:49:01 -0800 | [diff] [blame] | 716 | pr_info("netem: version " VERSION "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | return register_qdisc(&netem_qdisc_ops); |
| 718 | } |
| 719 | static void __exit netem_module_exit(void) |
| 720 | { |
| 721 | unregister_qdisc(&netem_qdisc_ops); |
| 722 | } |
| 723 | module_init(netem_module_init) |
| 724 | module_exit(netem_module_exit) |
| 725 | MODULE_LICENSE("GPL"); |