Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_gred.c Generic Random Early Detection queue. |
| 3 | * |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version |
| 8 | * 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * Authors: J Hadi Salim (hadi@cyberus.ca) 1998-2002 |
| 11 | * |
| 12 | * 991129: - Bug fix with grio mode |
| 13 | * - a better sing. AvgQ mode with Grio(WRED) |
| 14 | * - A finer grained VQ dequeue based on sugestion |
| 15 | * from Ren Liu |
| 16 | * - More error checks |
| 17 | * |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 18 | * For all the glorious comments look at include/net/red.h |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | */ |
| 20 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/types.h> |
| 24 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <net/pkt_sched.h> |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 27 | #include <net/red.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 29 | #define GRED_DEF_PRIO (MAX_DPs / 2) |
Thomas Graf | 716a1b4 | 2005-11-05 21:14:20 +0100 | [diff] [blame] | 30 | #define GRED_VQ_MASK (MAX_DPs - 1) |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | struct gred_sched_data; |
| 33 | struct gred_sched; |
| 34 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 35 | struct gred_sched_data { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | u32 limit; /* HARD maximal queue length */ |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 37 | u32 DP; /* the drop parameters */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | u32 bytesin; /* bytes seen on virtualQ so far*/ |
| 39 | u32 packetsin; /* packets seen on virtualQ so far*/ |
| 40 | u32 backlog; /* bytes on the virtualQ */ |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 41 | u8 prio; /* the prio of this vq */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +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 | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 45 | struct red_stats stats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | }; |
| 47 | |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 48 | enum { |
| 49 | GRED_WRED_MODE = 1, |
Thomas Graf | d6fd4e9 | 2005-11-05 21:14:10 +0100 | [diff] [blame] | 50 | GRED_RIO_MODE, |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 51 | }; |
| 52 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 53 | struct gred_sched { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | struct gred_sched_data *tab[MAX_DPs]; |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 55 | unsigned long flags; |
Thomas Graf | b38c7ee | 2005-11-05 21:14:27 +0100 | [diff] [blame] | 56 | u32 red_flags; |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 57 | u32 DPs; |
| 58 | u32 def; |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 59 | struct red_vars wred_set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | }; |
| 61 | |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 62 | static inline int gred_wred_mode(struct gred_sched *table) |
| 63 | { |
| 64 | return test_bit(GRED_WRED_MODE, &table->flags); |
| 65 | } |
| 66 | |
| 67 | static inline void gred_enable_wred_mode(struct gred_sched *table) |
| 68 | { |
| 69 | __set_bit(GRED_WRED_MODE, &table->flags); |
| 70 | } |
| 71 | |
| 72 | static inline void gred_disable_wred_mode(struct gred_sched *table) |
| 73 | { |
| 74 | __clear_bit(GRED_WRED_MODE, &table->flags); |
| 75 | } |
| 76 | |
Thomas Graf | d6fd4e9 | 2005-11-05 21:14:10 +0100 | [diff] [blame] | 77 | static inline int gred_rio_mode(struct gred_sched *table) |
| 78 | { |
| 79 | return test_bit(GRED_RIO_MODE, &table->flags); |
| 80 | } |
| 81 | |
| 82 | static inline void gred_enable_rio_mode(struct gred_sched *table) |
| 83 | { |
| 84 | __set_bit(GRED_RIO_MODE, &table->flags); |
| 85 | } |
| 86 | |
| 87 | static inline void gred_disable_rio_mode(struct gred_sched *table) |
| 88 | { |
| 89 | __clear_bit(GRED_RIO_MODE, &table->flags); |
| 90 | } |
| 91 | |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 92 | static inline int gred_wred_mode_check(struct Qdisc *sch) |
| 93 | { |
| 94 | struct gred_sched *table = qdisc_priv(sch); |
| 95 | int i; |
| 96 | |
| 97 | /* Really ugly O(n^2) but shouldn't be necessary too frequent. */ |
| 98 | for (i = 0; i < table->DPs; i++) { |
| 99 | struct gred_sched_data *q = table->tab[i]; |
| 100 | int n; |
| 101 | |
| 102 | if (q == NULL) |
| 103 | continue; |
| 104 | |
| 105 | for (n = 0; n < table->DPs; n++) |
| 106 | if (table->tab[n] && table->tab[n] != q && |
| 107 | table->tab[n]->prio == q->prio) |
| 108 | return 1; |
| 109 | } |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 114 | static inline unsigned int gred_backlog(struct gred_sched *table, |
| 115 | struct gred_sched_data *q, |
| 116 | struct Qdisc *sch) |
| 117 | { |
| 118 | if (gred_wred_mode(table)) |
| 119 | return sch->qstats.backlog; |
| 120 | else |
| 121 | return q->backlog; |
| 122 | } |
| 123 | |
Thomas Graf | 716a1b4 | 2005-11-05 21:14:20 +0100 | [diff] [blame] | 124 | static inline u16 tc_index_to_dp(struct sk_buff *skb) |
| 125 | { |
| 126 | return skb->tc_index & GRED_VQ_MASK; |
| 127 | } |
| 128 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 129 | static inline void gred_load_wred_set(const struct gred_sched *table, |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 130 | struct gred_sched_data *q) |
| 131 | { |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 132 | q->vars.qavg = table->wred_set.qavg; |
| 133 | q->vars.qidlestart = table->wred_set.qidlestart; |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | static inline void gred_store_wred_set(struct gred_sched *table, |
| 137 | struct gred_sched_data *q) |
| 138 | { |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 139 | table->wred_set.qavg = q->vars.qavg; |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 140 | } |
| 141 | |
Thomas Graf | b38c7ee | 2005-11-05 21:14:27 +0100 | [diff] [blame] | 142 | static inline int gred_use_ecn(struct gred_sched *t) |
| 143 | { |
| 144 | return t->red_flags & TC_RED_ECN; |
| 145 | } |
| 146 | |
Thomas Graf | bdc450a | 2005-11-05 21:14:28 +0100 | [diff] [blame] | 147 | static inline int gred_use_harddrop(struct gred_sched *t) |
| 148 | { |
| 149 | return t->red_flags & TC_RED_HARDDROP; |
| 150 | } |
| 151 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 152 | static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 154 | struct gred_sched_data *q = NULL; |
| 155 | struct gred_sched *t = qdisc_priv(sch); |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 156 | unsigned long qavg = 0; |
Thomas Graf | 4a59183 | 2005-11-05 21:14:22 +0100 | [diff] [blame] | 157 | u16 dp = tc_index_to_dp(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 159 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 160 | dp = t->def; |
| 161 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 162 | q = t->tab[dp]; |
| 163 | if (!q) { |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 164 | /* Pass through packets not assigned to a DP |
| 165 | * if no default DP has been configured. This |
| 166 | * allows for DP flows to be left untouched. |
| 167 | */ |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 168 | if (skb_queue_len(&sch->q) < qdisc_dev(sch)->tx_queue_len) |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 169 | return qdisc_enqueue_tail(skb, sch); |
| 170 | else |
| 171 | goto drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 173 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 174 | /* fix tc_index? --could be controversial but needed for |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | requeueing */ |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 176 | skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 179 | /* sum up all the qaves of prios <= to ours to get the new qave */ |
Thomas Graf | d6fd4e9 | 2005-11-05 21:14:10 +0100 | [diff] [blame] | 180 | if (!gred_wred_mode(t) && gred_rio_mode(t)) { |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 181 | int i; |
| 182 | |
| 183 | for (i = 0; i < t->DPs; i++) { |
| 184 | if (t->tab[i] && t->tab[i]->prio < q->prio && |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 185 | !red_is_idling(&t->tab[i]->vars)) |
| 186 | qavg += t->tab[i]->vars.qavg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | q->packetsin++; |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 192 | q->bytesin += qdisc_pkt_len(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 194 | if (gred_wred_mode(t)) |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 195 | gred_load_wred_set(t, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 197 | q->vars.qavg = red_calc_qavg(&q->parms, |
| 198 | &q->vars, |
| 199 | gred_backlog(t, q, sch)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 201 | if (red_is_idling(&q->vars)) |
| 202 | red_end_of_idle_period(&q->vars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 204 | if (gred_wred_mode(t)) |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 205 | gred_store_wred_set(t, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 207 | switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 208 | case RED_DONT_MARK: |
| 209 | break; |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 210 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 211 | case RED_PROB_MARK: |
| 212 | sch->qstats.overlimits++; |
| 213 | if (!gred_use_ecn(t) || !INET_ECN_set_ce(skb)) { |
| 214 | q->stats.prob_drop++; |
| 215 | goto congestion_drop; |
| 216 | } |
Thomas Graf | b38c7ee | 2005-11-05 21:14:27 +0100 | [diff] [blame] | 217 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 218 | q->stats.prob_mark++; |
| 219 | break; |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 220 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 221 | case RED_HARD_MARK: |
| 222 | sch->qstats.overlimits++; |
| 223 | if (gred_use_harddrop(t) || !gred_use_ecn(t) || |
| 224 | !INET_ECN_set_ce(skb)) { |
| 225 | q->stats.forced_drop++; |
| 226 | goto congestion_drop; |
| 227 | } |
| 228 | q->stats.forced_mark++; |
| 229 | break; |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 230 | } |
| 231 | |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 232 | if (q->backlog + qdisc_pkt_len(skb) <= q->limit) { |
| 233 | q->backlog += qdisc_pkt_len(skb); |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 234 | return qdisc_enqueue_tail(skb, sch); |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 235 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 237 | q->stats.pdrop++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | drop: |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 239 | return qdisc_drop(skb, sch); |
Thomas Graf | c3b553c | 2005-11-05 21:14:18 +0100 | [diff] [blame] | 240 | |
| 241 | congestion_drop: |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 242 | qdisc_drop(skb, sch); |
Thomas Graf | c3b553c | 2005-11-05 21:14:18 +0100 | [diff] [blame] | 243 | return NET_XMIT_CN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 246 | static struct sk_buff *gred_dequeue(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | { |
| 248 | struct sk_buff *skb; |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 249 | struct gred_sched *t = qdisc_priv(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 251 | skb = qdisc_dequeue_head(sch); |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | if (skb) { |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 254 | struct gred_sched_data *q; |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 255 | u16 dp = tc_index_to_dp(skb); |
| 256 | |
| 257 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { |
| 258 | if (net_ratelimit()) |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 259 | pr_warning("GRED: Unable to relocate VQ 0x%x " |
| 260 | "after dequeue, screwing up " |
| 261 | "backlog.\n", tc_index_to_dp(skb)); |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 262 | } else { |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 263 | q->backlog -= qdisc_pkt_len(skb); |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 264 | |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 265 | if (!q->backlog && !gred_wred_mode(t)) |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 266 | red_start_of_idle_period(&q->vars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return skb; |
| 270 | } |
| 271 | |
Thomas Graf | d8f64e1 | 2005-11-05 21:14:26 +0100 | [diff] [blame] | 272 | if (gred_wred_mode(t) && !red_is_idling(&t->wred_set)) |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 273 | red_start_of_idle_period(&t->wred_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | return NULL; |
| 276 | } |
| 277 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 278 | static unsigned int gred_drop(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | { |
| 280 | struct sk_buff *skb; |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 281 | struct gred_sched *t = qdisc_priv(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 283 | skb = qdisc_dequeue_tail(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | if (skb) { |
Jussi Kivilinna | 0abf77e | 2008-07-20 00:08:27 -0700 | [diff] [blame] | 285 | unsigned int len = qdisc_pkt_len(skb); |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 286 | struct gred_sched_data *q; |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 287 | u16 dp = tc_index_to_dp(skb); |
| 288 | |
| 289 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { |
| 290 | if (net_ratelimit()) |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 291 | pr_warning("GRED: Unable to relocate VQ 0x%x " |
| 292 | "while dropping, screwing up " |
| 293 | "backlog.\n", tc_index_to_dp(skb)); |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 294 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | q->backlog -= len; |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 296 | q->stats.other++; |
Thomas Graf | 18e3fb84 | 2005-11-05 21:14:21 +0100 | [diff] [blame] | 297 | |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 298 | if (!q->backlog && !gred_wred_mode(t)) |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 299 | red_start_of_idle_period(&q->vars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 302 | qdisc_drop(skb, sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | return len; |
| 304 | } |
| 305 | |
Thomas Graf | d8f64e1 | 2005-11-05 21:14:26 +0100 | [diff] [blame] | 306 | if (gred_wred_mode(t) && !red_is_idling(&t->wred_set)) |
Thomas Graf | 7051703 | 2005-11-05 21:14:23 +0100 | [diff] [blame] | 307 | red_start_of_idle_period(&t->wred_set); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | return 0; |
| 310 | |
| 311 | } |
| 312 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 313 | static void gred_reset(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | { |
| 315 | int i; |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 316 | struct gred_sched *t = qdisc_priv(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Thomas Graf | edf7a7b | 2005-11-05 21:14:19 +0100 | [diff] [blame] | 318 | qdisc_reset_queue(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 320 | for (i = 0; i < t->DPs; i++) { |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 321 | struct gred_sched_data *q = t->tab[i]; |
| 322 | |
| 323 | if (!q) |
| 324 | continue; |
| 325 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 326 | red_restart(&q->vars); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | q->backlog = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | } |
| 330 | |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 331 | static inline void gred_destroy_vq(struct gred_sched_data *q) |
| 332 | { |
| 333 | kfree(q); |
| 334 | } |
| 335 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 336 | static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps) |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 337 | { |
| 338 | struct gred_sched *table = qdisc_priv(sch); |
| 339 | struct tc_gred_sopt *sopt; |
| 340 | int i; |
| 341 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 342 | if (dps == NULL) |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 343 | return -EINVAL; |
| 344 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 345 | sopt = nla_data(dps); |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 346 | |
| 347 | if (sopt->DPs > MAX_DPs || sopt->DPs == 0 || sopt->def_DP >= sopt->DPs) |
| 348 | return -EINVAL; |
| 349 | |
| 350 | sch_tree_lock(sch); |
| 351 | table->DPs = sopt->DPs; |
| 352 | table->def = sopt->def_DP; |
Thomas Graf | b38c7ee | 2005-11-05 21:14:27 +0100 | [diff] [blame] | 353 | table->red_flags = sopt->flags; |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 354 | |
| 355 | /* |
| 356 | * Every entry point to GRED is synchronized with the above code |
| 357 | * and the DP is checked against DPs, i.e. shadowed VQs can no |
| 358 | * longer be found so we can unlock right here. |
| 359 | */ |
| 360 | sch_tree_unlock(sch); |
| 361 | |
| 362 | if (sopt->grio) { |
| 363 | gred_enable_rio_mode(table); |
| 364 | gred_disable_wred_mode(table); |
| 365 | if (gred_wred_mode_check(sch)) |
| 366 | gred_enable_wred_mode(table); |
| 367 | } else { |
| 368 | gred_disable_rio_mode(table); |
| 369 | gred_disable_wred_mode(table); |
| 370 | } |
| 371 | |
| 372 | for (i = table->DPs; i < MAX_DPs; i++) { |
| 373 | if (table->tab[i]) { |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 374 | pr_warning("GRED: Warning: Destroying " |
| 375 | "shadowed VQ 0x%x\n", i); |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 376 | gred_destroy_vq(table->tab[i]); |
| 377 | table->tab[i] = NULL; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 378 | } |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 379 | } |
| 380 | |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 381 | return 0; |
| 382 | } |
| 383 | |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 384 | static inline int gred_change_vq(struct Qdisc *sch, int dp, |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 385 | struct tc_gred_qopt *ctl, int prio, |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 386 | u8 *stab, u32 max_P, |
| 387 | struct gred_sched_data **prealloc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | { |
| 389 | struct gred_sched *table = qdisc_priv(sch); |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 390 | struct gred_sched_data *q = table->tab[dp]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 392 | if (!q) { |
| 393 | table->tab[dp] = q = *prealloc; |
| 394 | *prealloc = NULL; |
| 395 | if (!q) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
| 398 | |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 399 | q->DP = dp; |
| 400 | q->prio = prio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | q->limit = ctl->limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 403 | if (q->backlog == 0) |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 404 | red_end_of_idle_period(&q->vars); |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 405 | |
| 406 | red_set_parms(&q->parms, |
| 407 | ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 408 | ctl->Scell_log, stab, max_P); |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 409 | red_set_vars(&q->vars); |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 410 | return 0; |
| 411 | } |
| 412 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 413 | static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = { |
| 414 | [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) }, |
| 415 | [TCA_GRED_STAB] = { .len = 256 }, |
| 416 | [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) }, |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 417 | [TCA_GRED_MAX_P] = { .type = NLA_U32 }, |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 418 | }; |
| 419 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 420 | static int gred_change(struct Qdisc *sch, struct nlattr *opt) |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 421 | { |
| 422 | struct gred_sched *table = qdisc_priv(sch); |
| 423 | struct tc_gred_qopt *ctl; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 424 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 425 | int err, prio = GRED_DEF_PRIO; |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 426 | u8 *stab; |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 427 | u32 max_P; |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 428 | struct gred_sched_data *prealloc; |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 429 | |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 430 | if (opt == NULL) |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 431 | return -EINVAL; |
| 432 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 433 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 434 | if (err < 0) |
| 435 | return err; |
| 436 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 437 | if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 438 | return gred_change_table_def(sch, opt); |
| 439 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 440 | if (tb[TCA_GRED_PARMS] == NULL || |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 441 | tb[TCA_GRED_STAB] == NULL) |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 442 | return -EINVAL; |
| 443 | |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 444 | max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0; |
| 445 | |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 446 | err = -EINVAL; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 447 | ctl = nla_data(tb[TCA_GRED_PARMS]); |
| 448 | stab = nla_data(tb[TCA_GRED_STAB]); |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 449 | |
| 450 | if (ctl->DP >= table->DPs) |
| 451 | goto errout; |
| 452 | |
| 453 | if (gred_rio_mode(table)) { |
| 454 | if (ctl->prio == 0) { |
| 455 | int def_prio = GRED_DEF_PRIO; |
| 456 | |
| 457 | if (table->tab[table->def]) |
| 458 | def_prio = table->tab[table->def]->prio; |
| 459 | |
| 460 | printk(KERN_DEBUG "GRED: DP %u does not have a prio " |
| 461 | "setting default to %d\n", ctl->DP, def_prio); |
| 462 | |
| 463 | prio = def_prio; |
| 464 | } else |
| 465 | prio = ctl->prio; |
| 466 | } |
| 467 | |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 468 | prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL); |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 469 | sch_tree_lock(sch); |
| 470 | |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 471 | err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc); |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 472 | if (err < 0) |
| 473 | goto errout_locked; |
| 474 | |
Thomas Graf | d6fd4e9 | 2005-11-05 21:14:10 +0100 | [diff] [blame] | 475 | if (gred_rio_mode(table)) { |
Thomas Graf | dea3f62 | 2005-11-05 21:14:09 +0100 | [diff] [blame] | 476 | gred_disable_wred_mode(table); |
| 477 | if (gred_wred_mode_check(sch)) |
| 478 | gred_enable_wred_mode(table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 481 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 483 | errout_locked: |
| 484 | sch_tree_unlock(sch); |
Eric Dumazet | 869aa41 | 2011-12-15 22:09:45 +0000 | [diff] [blame] | 485 | kfree(prealloc); |
Thomas Graf | f62d6b9 | 2005-11-05 21:14:15 +0100 | [diff] [blame] | 486 | errout: |
| 487 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 490 | static int gred_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 492 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 493 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 495 | if (opt == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | return -EINVAL; |
| 497 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 498 | err = nla_parse_nested(tb, TCA_GRED_MAX, opt, gred_policy); |
Patrick McHardy | cee6372 | 2008-01-23 20:33:32 -0800 | [diff] [blame] | 499 | if (err < 0) |
| 500 | return err; |
| 501 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 502 | if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 503 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 505 | return gred_change_table_def(sch, tb[TCA_GRED_DPS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | static int gred_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 509 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | struct gred_sched *table = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 511 | struct nlattr *parms, *opts = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | int i; |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 513 | u32 max_p[MAX_DPs]; |
Thomas Graf | e063682 | 2005-11-05 21:14:12 +0100 | [diff] [blame] | 514 | struct tc_gred_sopt sopt = { |
| 515 | .DPs = table->DPs, |
| 516 | .def_DP = table->def, |
| 517 | .grio = gred_rio_mode(table), |
Thomas Graf | b38c7ee | 2005-11-05 21:14:27 +0100 | [diff] [blame] | 518 | .flags = table->red_flags, |
Thomas Graf | e063682 | 2005-11-05 21:14:12 +0100 | [diff] [blame] | 519 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 521 | opts = nla_nest_start(skb, TCA_OPTIONS); |
| 522 | if (opts == NULL) |
| 523 | goto nla_put_failure; |
| 524 | NLA_PUT(skb, TCA_GRED_DPS, sizeof(sopt), &sopt); |
Eric Dumazet | a73ed26 | 2011-12-09 02:46:45 +0000 | [diff] [blame] | 525 | |
| 526 | for (i = 0; i < MAX_DPs; i++) { |
| 527 | struct gred_sched_data *q = table->tab[i]; |
| 528 | |
| 529 | max_p[i] = q ? q->parms.max_P : 0; |
| 530 | } |
| 531 | NLA_PUT(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p); |
| 532 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 533 | parms = nla_nest_start(skb, TCA_GRED_PARMS); |
| 534 | if (parms == NULL) |
| 535 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Thomas Graf | 05f1cc0 | 2005-11-05 21:14:11 +0100 | [diff] [blame] | 537 | for (i = 0; i < MAX_DPs; i++) { |
| 538 | struct gred_sched_data *q = table->tab[i]; |
| 539 | struct tc_gred_qopt opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Thomas Graf | 05f1cc0 | 2005-11-05 21:14:11 +0100 | [diff] [blame] | 541 | memset(&opt, 0, sizeof(opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
| 543 | if (!q) { |
| 544 | /* hack -- fix at some point with proper message |
| 545 | This is how we indicate to tc that there is no VQ |
| 546 | at this DP */ |
| 547 | |
Thomas Graf | 05f1cc0 | 2005-11-05 21:14:11 +0100 | [diff] [blame] | 548 | opt.DP = MAX_DPs + i; |
| 549 | goto append_opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
Thomas Graf | 05f1cc0 | 2005-11-05 21:14:11 +0100 | [diff] [blame] | 552 | opt.limit = q->limit; |
| 553 | opt.DP = q->DP; |
| 554 | opt.backlog = q->backlog; |
| 555 | opt.prio = q->prio; |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 556 | opt.qth_min = q->parms.qth_min >> q->parms.Wlog; |
| 557 | opt.qth_max = q->parms.qth_max >> q->parms.Wlog; |
| 558 | opt.Wlog = q->parms.Wlog; |
| 559 | opt.Plog = q->parms.Plog; |
| 560 | opt.Scell_log = q->parms.Scell_log; |
| 561 | opt.other = q->stats.other; |
| 562 | opt.early = q->stats.prob_drop; |
| 563 | opt.forced = q->stats.forced_drop; |
| 564 | opt.pdrop = q->stats.pdrop; |
Thomas Graf | 05f1cc0 | 2005-11-05 21:14:11 +0100 | [diff] [blame] | 565 | opt.packets = q->packetsin; |
| 566 | opt.bytesin = q->bytesin; |
| 567 | |
David Ward | 244b65d | 2012-04-15 12:31:45 +0000 | [diff] [blame] | 568 | if (gred_wred_mode(table)) |
| 569 | gred_load_wred_set(table, q); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | |
Eric Dumazet | eeca668 | 2012-01-05 02:25:16 +0000 | [diff] [blame] | 571 | opt.qave = red_calc_qavg(&q->parms, &q->vars, q->vars.qavg); |
Thomas Graf | 22b3342 | 2005-11-05 21:14:16 +0100 | [diff] [blame] | 572 | |
Thomas Graf | 05f1cc0 | 2005-11-05 21:14:11 +0100 | [diff] [blame] | 573 | append_opt: |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 574 | if (nla_append(skb, sizeof(opt), &opt) < 0) |
| 575 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 578 | nla_nest_end(skb, parms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 580 | return nla_nest_end(skb, opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 582 | nla_put_failure: |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 583 | nla_nest_cancel(skb, opts); |
| 584 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | static void gred_destroy(struct Qdisc *sch) |
| 588 | { |
| 589 | struct gred_sched *table = qdisc_priv(sch); |
| 590 | int i; |
| 591 | |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 592 | for (i = 0; i < table->DPs; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | if (table->tab[i]) |
Thomas Graf | 6639607 | 2005-11-05 21:14:13 +0100 | [diff] [blame] | 594 | gred_destroy_vq(table->tab[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | } |
| 597 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 598 | static struct Qdisc_ops gred_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | .id = "gred", |
| 600 | .priv_size = sizeof(struct gred_sched), |
| 601 | .enqueue = gred_enqueue, |
| 602 | .dequeue = gred_dequeue, |
Jarek Poplawski | 8e3af97 | 2008-10-31 00:45:55 -0700 | [diff] [blame] | 603 | .peek = qdisc_peek_head, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | .drop = gred_drop, |
| 605 | .init = gred_init, |
| 606 | .reset = gred_reset, |
| 607 | .destroy = gred_destroy, |
| 608 | .change = gred_change, |
| 609 | .dump = gred_dump, |
| 610 | .owner = THIS_MODULE, |
| 611 | }; |
| 612 | |
| 613 | static int __init gred_module_init(void) |
| 614 | { |
| 615 | return register_qdisc(&gred_qdisc_ops); |
| 616 | } |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 617 | |
| 618 | static void __exit gred_module_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
| 620 | unregister_qdisc(&gred_qdisc_ops); |
| 621 | } |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | module_init(gred_module_init) |
| 624 | module_exit(gred_module_exit) |
Thomas Graf | 1e4dfaf9 | 2005-11-05 21:14:25 +0100 | [diff] [blame] | 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | MODULE_LICENSE("GPL"); |