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 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 39 | struct red_sched_data { |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 40 | u32 limit; /* HARD maximal queue length */ |
| 41 | unsigned char flags; |
Eric Dumazet | 8af2a21 | 2011-12-08 06:06:03 +0000 | [diff] [blame] | 42 | struct timer_list adapt_timer; |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 43 | struct red_parms parms; |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 44 | struct red_vars vars; |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 45 | struct red_stats stats; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 46 | struct Qdisc *qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 49 | static inline int red_use_ecn(struct red_sched_data *q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 51 | return q->flags & TC_RED_ECN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | } |
| 53 | |
Thomas Graf | bdc450a | 2005-11-05 21:14:28 +0100 | [diff] [blame] | 54 | static inline int red_use_harddrop(struct red_sched_data *q) |
| 55 | { |
| 56 | return q->flags & TC_RED_HARDDROP; |
| 57 | } |
| 58 | |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 59 | static int red_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
| 60 | struct sk_buff **to_free) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
| 62 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 63 | struct Qdisc *child = q->qdisc; |
| 64 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 66 | q->vars.qavg = red_calc_qavg(&q->parms, |
| 67 | &q->vars, |
| 68 | child->qstats.backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 70 | if (red_is_idling(&q->vars)) |
| 71 | red_end_of_idle_period(&q->vars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 73 | switch (red_action(&q->parms, &q->vars, q->vars.qavg)) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 74 | case RED_DONT_MARK: |
| 75 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 77 | case RED_PROB_MARK: |
John Fastabend | 25331d6 | 2014-09-28 11:53:29 -0700 | [diff] [blame] | 78 | qdisc_qstats_overlimit(sch); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 79 | if (!red_use_ecn(q) || !INET_ECN_set_ce(skb)) { |
| 80 | q->stats.prob_drop++; |
| 81 | goto congestion_drop; |
| 82 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 84 | q->stats.prob_mark++; |
| 85 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 87 | case RED_HARD_MARK: |
John Fastabend | 25331d6 | 2014-09-28 11:53:29 -0700 | [diff] [blame] | 88 | qdisc_qstats_overlimit(sch); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 89 | if (red_use_harddrop(q) || !red_use_ecn(q) || |
| 90 | !INET_ECN_set_ce(skb)) { |
| 91 | q->stats.forced_drop++; |
| 92 | goto congestion_drop; |
| 93 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 95 | q->stats.forced_mark++; |
| 96 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 99 | ret = qdisc_enqueue(skb, child, to_free); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 100 | if (likely(ret == NET_XMIT_SUCCESS)) { |
WANG Cong | d7f4f33 | 2016-06-01 16:15:18 -0700 | [diff] [blame] | 101 | qdisc_qstats_backlog_inc(sch, skb); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 102 | sch->q.qlen++; |
Jarek Poplawski | 378a2f0 | 2008-08-04 22:31:03 -0700 | [diff] [blame] | 103 | } else if (net_xmit_drop_count(ret)) { |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 104 | q->stats.pdrop++; |
John Fastabend | 25331d6 | 2014-09-28 11:53:29 -0700 | [diff] [blame] | 105 | qdisc_qstats_drop(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 106 | } |
| 107 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 109 | congestion_drop: |
Eric Dumazet | 520ac30 | 2016-06-21 23:16:49 -0700 | [diff] [blame] | 110 | qdisc_drop(skb, sch, to_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | return NET_XMIT_CN; |
| 112 | } |
| 113 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 114 | static struct sk_buff *red_dequeue(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | { |
| 116 | struct sk_buff *skb; |
| 117 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 118 | struct Qdisc *child = q->qdisc; |
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 | skb = child->dequeue(child); |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 121 | if (skb) { |
| 122 | qdisc_bstats_update(sch, skb); |
WANG Cong | d7f4f33 | 2016-06-01 16:15:18 -0700 | [diff] [blame] | 123 | qdisc_qstats_backlog_dec(sch, skb); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 124 | sch->q.qlen--; |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 125 | } else { |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 126 | if (!red_is_idling(&q->vars)) |
| 127 | red_start_of_idle_period(&q->vars); |
Eric Dumazet | 9190b3b | 2011-01-20 23:31:33 -0800 | [diff] [blame] | 128 | } |
Thomas Graf | 9e178ff | 2005-11-05 21:14:06 +0100 | [diff] [blame] | 129 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 132 | static struct sk_buff *red_peek(struct Qdisc *sch) |
Jarek Poplawski | 8e3af97 | 2008-10-31 00:45:55 -0700 | [diff] [blame] | 133 | { |
| 134 | struct red_sched_data *q = qdisc_priv(sch); |
| 135 | struct Qdisc *child = q->qdisc; |
| 136 | |
| 137 | return child->ops->peek(child); |
| 138 | } |
| 139 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 140 | static void red_reset(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | { |
| 142 | struct red_sched_data *q = qdisc_priv(sch); |
| 143 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 144 | qdisc_reset(q->qdisc); |
WANG Cong | d7f4f33 | 2016-06-01 16:15:18 -0700 | [diff] [blame] | 145 | sch->qstats.backlog = 0; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 146 | sch->q.qlen = 0; |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 147 | red_restart(&q->vars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 150 | static void red_destroy(struct Qdisc *sch) |
| 151 | { |
| 152 | struct red_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | 8af2a21 | 2011-12-08 06:06:03 +0000 | [diff] [blame] | 153 | |
| 154 | del_timer_sync(&q->adapt_timer); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 155 | qdisc_destroy(q->qdisc); |
| 156 | } |
| 157 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 158 | static const struct nla_policy red_policy[TCA_RED_MAX + 1] = { |
| 159 | [TCA_RED_PARMS] = { .len = sizeof(struct tc_red_qopt) }, |
| 160 | [TCA_RED_STAB] = { .len = RED_STAB_SIZE }, |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 161 | [TCA_RED_MAX_P] = { .type = NLA_U32 }, |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 162 | }; |
| 163 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 164 | static int red_change(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
| 166 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 167 | struct nlattr *tb[TCA_RED_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | struct tc_red_qopt *ctl; |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 169 | struct Qdisc *child = NULL; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 170 | int err; |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 171 | u32 max_P; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 173 | if (opt == NULL) |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 174 | return -EINVAL; |
| 175 | |
Johannes Berg | fceb643 | 2017-04-12 14:34:07 +0200 | [diff] [blame] | 176 | err = nla_parse_nested(tb, TCA_RED_MAX, opt, red_policy, NULL); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 177 | if (err < 0) |
| 178 | return err; |
| 179 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 180 | if (tb[TCA_RED_PARMS] == NULL || |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 181 | tb[TCA_RED_STAB] == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return -EINVAL; |
| 183 | |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 184 | max_P = tb[TCA_RED_MAX_P] ? nla_get_u32(tb[TCA_RED_MAX_P]) : 0; |
| 185 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 186 | ctl = nla_data(tb[TCA_RED_PARMS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 188 | if (ctl->limit > 0) { |
Patrick McHardy | fb0305c | 2008-07-05 23:40:21 -0700 | [diff] [blame] | 189 | child = fifo_create_dflt(sch, &bfifo_qdisc_ops, ctl->limit); |
| 190 | if (IS_ERR(child)) |
| 191 | return PTR_ERR(child); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 192 | } |
| 193 | |
Jiri Kosina | 49b4997 | 2017-03-08 16:03:32 +0100 | [diff] [blame] | 194 | if (child != &noop_qdisc) |
| 195 | qdisc_hash_add(child, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | sch_tree_lock(sch); |
| 197 | q->flags = ctl->flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | q->limit = ctl->limit; |
Patrick McHardy | 5e50da0 | 2006-11-29 17:36:20 -0800 | [diff] [blame] | 199 | if (child) { |
WANG Cong | 2ccccf5 | 2016-02-25 14:55:01 -0800 | [diff] [blame] | 200 | qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen, |
| 201 | q->qdisc->qstats.backlog); |
Patrick McHardy | b94c8af | 2008-11-20 04:11:36 -0800 | [diff] [blame] | 202 | qdisc_destroy(q->qdisc); |
| 203 | q->qdisc = child; |
Patrick McHardy | 5e50da0 | 2006-11-29 17:36:20 -0800 | [diff] [blame] | 204 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 206 | red_set_parms(&q->parms, |
| 207 | ctl->qth_min, ctl->qth_max, ctl->Wlog, |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 208 | ctl->Plog, ctl->Scell_log, |
| 209 | nla_data(tb[TCA_RED_STAB]), |
| 210 | max_P); |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 211 | red_set_vars(&q->vars); |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 212 | |
Eric Dumazet | 8af2a21 | 2011-12-08 06:06:03 +0000 | [diff] [blame] | 213 | del_timer(&q->adapt_timer); |
| 214 | if (ctl->flags & TC_RED_ADAPTATIVE) |
| 215 | mod_timer(&q->adapt_timer, jiffies + HZ/2); |
| 216 | |
Eric Dumazet | 1ee5fa1 | 2011-12-01 11:06:34 +0000 | [diff] [blame] | 217 | if (!q->qdisc->q.qlen) |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 218 | red_start_of_idle_period(&q->vars); |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | sch_tree_unlock(sch); |
| 221 | return 0; |
| 222 | } |
| 223 | |
Eric Dumazet | 8af2a21 | 2011-12-08 06:06:03 +0000 | [diff] [blame] | 224 | static inline void red_adaptative_timer(unsigned long arg) |
| 225 | { |
| 226 | struct Qdisc *sch = (struct Qdisc *)arg; |
| 227 | struct red_sched_data *q = qdisc_priv(sch); |
| 228 | spinlock_t *root_lock = qdisc_lock(qdisc_root_sleeping(sch)); |
| 229 | |
| 230 | spin_lock(root_lock); |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 231 | red_adaptative_algo(&q->parms, &q->vars); |
Eric Dumazet | 8af2a21 | 2011-12-08 06:06:03 +0000 | [diff] [blame] | 232 | mod_timer(&q->adapt_timer, jiffies + HZ/2); |
| 233 | spin_unlock(root_lock); |
| 234 | } |
| 235 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 236 | static int red_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 238 | struct red_sched_data *q = qdisc_priv(sch); |
| 239 | |
| 240 | q->qdisc = &noop_qdisc; |
Eric Dumazet | 8af2a21 | 2011-12-08 06:06:03 +0000 | [diff] [blame] | 241 | setup_timer(&q->adapt_timer, red_adaptative_timer, (unsigned long)sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | return red_change(sch, opt); |
| 243 | } |
| 244 | |
| 245 | static int red_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 246 | { |
| 247 | struct red_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 248 | struct nlattr *opts = NULL; |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 249 | struct tc_red_qopt opt = { |
| 250 | .limit = q->limit, |
| 251 | .flags = q->flags, |
| 252 | .qth_min = q->parms.qth_min >> q->parms.Wlog, |
| 253 | .qth_max = q->parms.qth_max >> q->parms.Wlog, |
| 254 | .Wlog = q->parms.Wlog, |
| 255 | .Plog = q->parms.Plog, |
| 256 | .Scell_log = q->parms.Scell_log, |
| 257 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
Eric Dumazet | 0dfb33a | 2011-01-03 08:11:38 +0000 | [diff] [blame] | 259 | sch->qstats.backlog = q->qdisc->qstats.backlog; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 260 | opts = nla_nest_start(skb, TCA_OPTIONS); |
| 261 | if (opts == NULL) |
| 262 | goto nla_put_failure; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 263 | if (nla_put(skb, TCA_RED_PARMS, sizeof(opt), &opt) || |
| 264 | nla_put_u32(skb, TCA_RED_MAX_P, q->parms.max_P)) |
| 265 | goto nla_put_failure; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 266 | return nla_nest_end(skb, opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 268 | nla_put_failure: |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 269 | nla_nest_cancel(skb, opts); |
| 270 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | static int red_dump_stats(struct Qdisc *sch, struct gnet_dump *d) |
| 274 | { |
| 275 | struct red_sched_data *q = qdisc_priv(sch); |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 276 | struct tc_red_xstats st = { |
| 277 | .early = q->stats.prob_drop + q->stats.forced_drop, |
| 278 | .pdrop = q->stats.pdrop, |
| 279 | .other = q->stats.other, |
| 280 | .marked = q->stats.prob_mark + q->stats.forced_mark, |
| 281 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Thomas Graf | 6b31b28 | 2005-11-05 21:14:05 +0100 | [diff] [blame] | 283 | return gnet_stats_copy_app(d, &st, sizeof(st)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 286 | static int red_dump_class(struct Qdisc *sch, unsigned long cl, |
| 287 | struct sk_buff *skb, struct tcmsg *tcm) |
| 288 | { |
| 289 | struct red_sched_data *q = qdisc_priv(sch); |
| 290 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 291 | tcm->tcm_handle |= TC_H_MIN(1); |
| 292 | tcm->tcm_info = q->qdisc->handle; |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int red_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
| 297 | struct Qdisc **old) |
| 298 | { |
| 299 | struct red_sched_data *q = qdisc_priv(sch); |
| 300 | |
| 301 | if (new == NULL) |
| 302 | new = &noop_qdisc; |
| 303 | |
WANG Cong | 86a7996 | 2016-02-25 14:55:00 -0800 | [diff] [blame] | 304 | *old = qdisc_replace(sch, new, &q->qdisc); |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static struct Qdisc *red_leaf(struct Qdisc *sch, unsigned long arg) |
| 309 | { |
| 310 | struct red_sched_data *q = qdisc_priv(sch); |
| 311 | return q->qdisc; |
| 312 | } |
| 313 | |
| 314 | static unsigned long red_get(struct Qdisc *sch, u32 classid) |
| 315 | { |
| 316 | return 1; |
| 317 | } |
| 318 | |
| 319 | static void red_put(struct Qdisc *sch, unsigned long arg) |
| 320 | { |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 321 | } |
| 322 | |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 323 | static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
| 324 | { |
| 325 | if (!walker->stop) { |
| 326 | if (walker->count >= walker->skip) |
| 327 | if (walker->fn(sch, 1, walker) < 0) { |
| 328 | walker->stop = 1; |
| 329 | return; |
| 330 | } |
| 331 | walker->count++; |
| 332 | } |
| 333 | } |
| 334 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 335 | static const struct Qdisc_class_ops red_class_ops = { |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 336 | .graft = red_graft, |
| 337 | .leaf = red_leaf, |
| 338 | .get = red_get, |
| 339 | .put = red_put, |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 340 | .walk = red_walk, |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 341 | .dump = red_dump_class, |
| 342 | }; |
| 343 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 344 | static struct Qdisc_ops red_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | .id = "red", |
| 346 | .priv_size = sizeof(struct red_sched_data), |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 347 | .cl_ops = &red_class_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | .enqueue = red_enqueue, |
| 349 | .dequeue = red_dequeue, |
Jarek Poplawski | 8e3af97 | 2008-10-31 00:45:55 -0700 | [diff] [blame] | 350 | .peek = red_peek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | .init = red_init, |
| 352 | .reset = red_reset, |
Patrick McHardy | f38c39d | 2006-03-20 19:20:44 -0800 | [diff] [blame] | 353 | .destroy = red_destroy, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | .change = red_change, |
| 355 | .dump = red_dump, |
| 356 | .dump_stats = red_dump_stats, |
| 357 | .owner = THIS_MODULE, |
| 358 | }; |
| 359 | |
| 360 | static int __init red_module_init(void) |
| 361 | { |
| 362 | return register_qdisc(&red_qdisc_ops); |
| 363 | } |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 364 | |
| 365 | static void __exit red_module_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | { |
| 367 | unregister_qdisc(&red_qdisc_ops); |
| 368 | } |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | module_init(red_module_init) |
| 371 | module_exit(red_module_exit) |
Thomas Graf | dba051f | 2005-11-05 21:14:08 +0100 | [diff] [blame] | 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | MODULE_LICENSE("GPL"); |