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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * net/sched/sch_gred.c Generic Random Early Detection queue. | |
4 | * | |
1da177e4 LT |
5 | * Authors: J Hadi Salim (hadi@cyberus.ca) 1998-2002 |
6 | * | |
7 | * 991129: - Bug fix with grio mode | |
8 | * - a better sing. AvgQ mode with Grio(WRED) | |
9 | * - A finer grained VQ dequeue based on sugestion | |
10 | * from Ren Liu | |
11 | * - More error checks | |
12 | * | |
1e4dfaf9 | 13 | * For all the glorious comments look at include/net/red.h |
1da177e4 LT |
14 | */ |
15 | ||
5a0e3ad6 | 16 | #include <linux/slab.h> |
1da177e4 | 17 | #include <linux/module.h> |
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/kernel.h> | |
1da177e4 | 20 | #include <linux/skbuff.h> |
890d8d23 | 21 | #include <net/pkt_cls.h> |
1da177e4 | 22 | #include <net/pkt_sched.h> |
22b33429 | 23 | #include <net/red.h> |
1da177e4 | 24 | |
f62d6b93 | 25 | #define GRED_DEF_PRIO (MAX_DPs / 2) |
716a1b40 | 26 | #define GRED_VQ_MASK (MAX_DPs - 1) |
f62d6b93 | 27 | |
25fc1989 JK |
28 | #define GRED_VQ_RED_FLAGS (TC_RED_ECN | TC_RED_HARDDROP) |
29 | ||
1da177e4 LT |
30 | struct gred_sched_data; |
31 | struct gred_sched; | |
32 | ||
cc7ec456 | 33 | struct gred_sched_data { |
1da177e4 | 34 | u32 limit; /* HARD maximal queue length */ |
a73ed26b | 35 | u32 DP; /* the drop parameters */ |
25fc1989 | 36 | u32 red_flags; /* virtualQ version of red_flags */ |
9f5cd0c8 | 37 | u64 bytesin; /* bytes seen on virtualQ so far*/ |
1da177e4 LT |
38 | u32 packetsin; /* packets seen on virtualQ so far*/ |
39 | u32 backlog; /* bytes on the virtualQ */ | |
1e4dfaf9 | 40 | u8 prio; /* the prio of this vq */ |
1da177e4 | 41 | |
22b33429 | 42 | struct red_parms parms; |
eeca6688 | 43 | struct red_vars vars; |
22b33429 | 44 | struct red_stats stats; |
1da177e4 LT |
45 | }; |
46 | ||
dea3f628 TG |
47 | enum { |
48 | GRED_WRED_MODE = 1, | |
d6fd4e96 | 49 | GRED_RIO_MODE, |
dea3f628 TG |
50 | }; |
51 | ||
cc7ec456 | 52 | struct gred_sched { |
1da177e4 | 53 | struct gred_sched_data *tab[MAX_DPs]; |
dea3f628 | 54 | unsigned long flags; |
b38c7eef | 55 | u32 red_flags; |
1e4dfaf9 TG |
56 | u32 DPs; |
57 | u32 def; | |
eeca6688 | 58 | struct red_vars wred_set; |
1da177e4 LT |
59 | }; |
60 | ||
dea3f628 TG |
61 | static inline int gred_wred_mode(struct gred_sched *table) |
62 | { | |
63 | return test_bit(GRED_WRED_MODE, &table->flags); | |
64 | } | |
65 | ||
66 | static inline void gred_enable_wred_mode(struct gred_sched *table) | |
67 | { | |
68 | __set_bit(GRED_WRED_MODE, &table->flags); | |
69 | } | |
70 | ||
71 | static inline void gred_disable_wred_mode(struct gred_sched *table) | |
72 | { | |
73 | __clear_bit(GRED_WRED_MODE, &table->flags); | |
74 | } | |
75 | ||
d6fd4e96 TG |
76 | static inline int gred_rio_mode(struct gred_sched *table) |
77 | { | |
78 | return test_bit(GRED_RIO_MODE, &table->flags); | |
79 | } | |
80 | ||
81 | static inline void gred_enable_rio_mode(struct gred_sched *table) | |
82 | { | |
83 | __set_bit(GRED_RIO_MODE, &table->flags); | |
84 | } | |
85 | ||
86 | static inline void gred_disable_rio_mode(struct gred_sched *table) | |
87 | { | |
88 | __clear_bit(GRED_RIO_MODE, &table->flags); | |
89 | } | |
90 | ||
dea3f628 TG |
91 | static inline int gred_wred_mode_check(struct Qdisc *sch) |
92 | { | |
93 | struct gred_sched *table = qdisc_priv(sch); | |
94 | int i; | |
95 | ||
96 | /* Really ugly O(n^2) but shouldn't be necessary too frequent. */ | |
97 | for (i = 0; i < table->DPs; i++) { | |
98 | struct gred_sched_data *q = table->tab[i]; | |
99 | int n; | |
100 | ||
101 | if (q == NULL) | |
102 | continue; | |
103 | ||
c22e4640 DW |
104 | for (n = i + 1; n < table->DPs; n++) |
105 | if (table->tab[n] && table->tab[n]->prio == q->prio) | |
dea3f628 TG |
106 | return 1; |
107 | } | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
22b33429 TG |
112 | static inline unsigned int gred_backlog(struct gred_sched *table, |
113 | struct gred_sched_data *q, | |
114 | struct Qdisc *sch) | |
115 | { | |
116 | if (gred_wred_mode(table)) | |
117 | return sch->qstats.backlog; | |
118 | else | |
119 | return q->backlog; | |
120 | } | |
121 | ||
716a1b40 TG |
122 | static inline u16 tc_index_to_dp(struct sk_buff *skb) |
123 | { | |
124 | return skb->tc_index & GRED_VQ_MASK; | |
125 | } | |
126 | ||
eeca6688 | 127 | static inline void gred_load_wred_set(const struct gred_sched *table, |
7051703b TG |
128 | struct gred_sched_data *q) |
129 | { | |
eeca6688 ED |
130 | q->vars.qavg = table->wred_set.qavg; |
131 | q->vars.qidlestart = table->wred_set.qidlestart; | |
7051703b TG |
132 | } |
133 | ||
134 | static inline void gred_store_wred_set(struct gred_sched *table, | |
135 | struct gred_sched_data *q) | |
136 | { | |
eeca6688 | 137 | table->wred_set.qavg = q->vars.qavg; |
ba1bf474 | 138 | table->wred_set.qidlestart = q->vars.qidlestart; |
7051703b TG |
139 | } |
140 | ||
25fc1989 | 141 | static int gred_use_ecn(struct gred_sched_data *q) |
b38c7eef | 142 | { |
25fc1989 | 143 | return q->red_flags & TC_RED_ECN; |
b38c7eef TG |
144 | } |
145 | ||
25fc1989 | 146 | static int gred_use_harddrop(struct gred_sched_data *q) |
bdc450a0 | 147 | { |
25fc1989 | 148 | return q->red_flags & TC_RED_HARDDROP; |
bdc450a0 TG |
149 | } |
150 | ||
72111015 JK |
151 | static bool gred_per_vq_red_flags_used(struct gred_sched *table) |
152 | { | |
153 | unsigned int i; | |
154 | ||
155 | /* Local per-vq flags couldn't have been set unless global are 0 */ | |
156 | if (table->red_flags) | |
157 | return false; | |
158 | for (i = 0; i < MAX_DPs; i++) | |
159 | if (table->tab[i] && table->tab[i]->red_flags) | |
160 | return true; | |
161 | return false; | |
162 | } | |
163 | ||
520ac30f ED |
164 | static int gred_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
165 | struct sk_buff **to_free) | |
1da177e4 | 166 | { |
cc7ec456 ED |
167 | struct gred_sched_data *q = NULL; |
168 | struct gred_sched *t = qdisc_priv(sch); | |
22b33429 | 169 | unsigned long qavg = 0; |
4a591834 | 170 | u16 dp = tc_index_to_dp(skb); |
1da177e4 | 171 | |
cc7ec456 | 172 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { |
18e3fb84 TG |
173 | dp = t->def; |
174 | ||
cc7ec456 ED |
175 | q = t->tab[dp]; |
176 | if (!q) { | |
18e3fb84 TG |
177 | /* Pass through packets not assigned to a DP |
178 | * if no default DP has been configured. This | |
179 | * allows for DP flows to be left untouched. | |
180 | */ | |
a3eb95f8 DW |
181 | if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <= |
182 | sch->limit)) | |
18e3fb84 TG |
183 | return qdisc_enqueue_tail(skb, sch); |
184 | else | |
185 | goto drop; | |
1da177e4 | 186 | } |
18e3fb84 | 187 | |
eeca6688 | 188 | /* fix tc_index? --could be controversial but needed for |
1da177e4 | 189 | requeueing */ |
18e3fb84 | 190 | skb->tc_index = (skb->tc_index & ~GRED_VQ_MASK) | dp; |
1da177e4 LT |
191 | } |
192 | ||
e29fe837 | 193 | /* sum up all the qaves of prios < ours to get the new qave */ |
d6fd4e96 | 194 | if (!gred_wred_mode(t) && gred_rio_mode(t)) { |
1e4dfaf9 TG |
195 | int i; |
196 | ||
197 | for (i = 0; i < t->DPs; i++) { | |
198 | if (t->tab[i] && t->tab[i]->prio < q->prio && | |
eeca6688 ED |
199 | !red_is_idling(&t->tab[i]->vars)) |
200 | qavg += t->tab[i]->vars.qavg; | |
1da177e4 | 201 | } |
1e4dfaf9 | 202 | |
1da177e4 LT |
203 | } |
204 | ||
205 | q->packetsin++; | |
0abf77e5 | 206 | q->bytesin += qdisc_pkt_len(skb); |
1da177e4 | 207 | |
1e4dfaf9 | 208 | if (gred_wred_mode(t)) |
7051703b | 209 | gred_load_wred_set(t, q); |
1da177e4 | 210 | |
eeca6688 ED |
211 | q->vars.qavg = red_calc_qavg(&q->parms, |
212 | &q->vars, | |
213 | gred_backlog(t, q, sch)); | |
1da177e4 | 214 | |
eeca6688 ED |
215 | if (red_is_idling(&q->vars)) |
216 | red_end_of_idle_period(&q->vars); | |
1da177e4 | 217 | |
dea3f628 | 218 | if (gred_wred_mode(t)) |
7051703b | 219 | gred_store_wred_set(t, q); |
1da177e4 | 220 | |
eeca6688 | 221 | switch (red_action(&q->parms, &q->vars, q->vars.qavg + qavg)) { |
cc7ec456 ED |
222 | case RED_DONT_MARK: |
223 | break; | |
224 | ||
225 | case RED_PROB_MARK: | |
25331d6c | 226 | qdisc_qstats_overlimit(sch); |
25fc1989 | 227 | if (!gred_use_ecn(q) || !INET_ECN_set_ce(skb)) { |
cc7ec456 ED |
228 | q->stats.prob_drop++; |
229 | goto congestion_drop; | |
230 | } | |
231 | ||
232 | q->stats.prob_mark++; | |
233 | break; | |
234 | ||
235 | case RED_HARD_MARK: | |
25331d6c | 236 | qdisc_qstats_overlimit(sch); |
25fc1989 | 237 | if (gred_use_harddrop(q) || !gred_use_ecn(q) || |
cc7ec456 ED |
238 | !INET_ECN_set_ce(skb)) { |
239 | q->stats.forced_drop++; | |
240 | goto congestion_drop; | |
241 | } | |
242 | q->stats.forced_mark++; | |
243 | break; | |
1da177e4 | 244 | } |
22b33429 | 245 | |
145a42b3 | 246 | if (gred_backlog(t, q, sch) + qdisc_pkt_len(skb) <= q->limit) { |
0abf77e5 | 247 | q->backlog += qdisc_pkt_len(skb); |
edf7a7b1 | 248 | return qdisc_enqueue_tail(skb, sch); |
1da177e4 | 249 | } |
22b33429 TG |
250 | |
251 | q->stats.pdrop++; | |
252 | drop: | |
520ac30f | 253 | return qdisc_drop(skb, sch, to_free); |
c3b553cd TG |
254 | |
255 | congestion_drop: | |
520ac30f | 256 | qdisc_drop(skb, sch, to_free); |
c3b553cd | 257 | return NET_XMIT_CN; |
1da177e4 LT |
258 | } |
259 | ||
cc7ec456 | 260 | static struct sk_buff *gred_dequeue(struct Qdisc *sch) |
1da177e4 LT |
261 | { |
262 | struct sk_buff *skb; | |
1e4dfaf9 | 263 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 264 | |
edf7a7b1 TG |
265 | skb = qdisc_dequeue_head(sch); |
266 | ||
1da177e4 | 267 | if (skb) { |
1e4dfaf9 | 268 | struct gred_sched_data *q; |
18e3fb84 TG |
269 | u16 dp = tc_index_to_dp(skb); |
270 | ||
271 | if (dp >= t->DPs || (q = t->tab[dp]) == NULL) { | |
e87cc472 JP |
272 | net_warn_ratelimited("GRED: Unable to relocate VQ 0x%x after dequeue, screwing up backlog\n", |
273 | tc_index_to_dp(skb)); | |
18e3fb84 | 274 | } else { |
0abf77e5 | 275 | q->backlog -= qdisc_pkt_len(skb); |
18e3fb84 | 276 | |
ba1bf474 DW |
277 | if (gred_wred_mode(t)) { |
278 | if (!sch->qstats.backlog) | |
279 | red_start_of_idle_period(&t->wred_set); | |
280 | } else { | |
281 | if (!q->backlog) | |
282 | red_start_of_idle_period(&q->vars); | |
283 | } | |
1da177e4 | 284 | } |
18e3fb84 | 285 | |
1da177e4 LT |
286 | return skb; |
287 | } | |
288 | ||
1da177e4 LT |
289 | return NULL; |
290 | } | |
291 | ||
cc7ec456 | 292 | static void gred_reset(struct Qdisc *sch) |
1da177e4 LT |
293 | { |
294 | int i; | |
1e4dfaf9 | 295 | struct gred_sched *t = qdisc_priv(sch); |
1da177e4 | 296 | |
edf7a7b1 | 297 | qdisc_reset_queue(sch); |
1da177e4 | 298 | |
10297b99 | 299 | for (i = 0; i < t->DPs; i++) { |
1e4dfaf9 TG |
300 | struct gred_sched_data *q = t->tab[i]; |
301 | ||
302 | if (!q) | |
303 | continue; | |
304 | ||
eeca6688 | 305 | red_restart(&q->vars); |
1da177e4 | 306 | q->backlog = 0; |
1da177e4 LT |
307 | } |
308 | } | |
309 | ||
890d8d23 JK |
310 | static void gred_offload(struct Qdisc *sch, enum tc_gred_command command) |
311 | { | |
312 | struct gred_sched *table = qdisc_priv(sch); | |
313 | struct net_device *dev = qdisc_dev(sch); | |
314 | struct tc_gred_qopt_offload opt = { | |
315 | .command = command, | |
316 | .handle = sch->handle, | |
317 | .parent = sch->parent, | |
318 | }; | |
319 | ||
320 | if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc) | |
321 | return; | |
322 | ||
323 | if (command == TC_GRED_REPLACE) { | |
324 | unsigned int i; | |
325 | ||
326 | opt.set.grio_on = gred_rio_mode(table); | |
327 | opt.set.wred_on = gred_wred_mode(table); | |
328 | opt.set.dp_cnt = table->DPs; | |
329 | opt.set.dp_def = table->def; | |
330 | ||
331 | for (i = 0; i < table->DPs; i++) { | |
332 | struct gred_sched_data *q = table->tab[i]; | |
333 | ||
334 | if (!q) | |
335 | continue; | |
336 | opt.set.tab[i].present = true; | |
337 | opt.set.tab[i].limit = q->limit; | |
338 | opt.set.tab[i].prio = q->prio; | |
339 | opt.set.tab[i].min = q->parms.qth_min >> q->parms.Wlog; | |
340 | opt.set.tab[i].max = q->parms.qth_max >> q->parms.Wlog; | |
341 | opt.set.tab[i].is_ecn = gred_use_ecn(q); | |
342 | opt.set.tab[i].is_harddrop = gred_use_harddrop(q); | |
343 | opt.set.tab[i].probability = q->parms.max_P; | |
344 | opt.set.tab[i].backlog = &q->backlog; | |
345 | } | |
346 | opt.set.qstats = &sch->qstats; | |
347 | } | |
348 | ||
349 | dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, &opt); | |
350 | } | |
351 | ||
e49efd52 JK |
352 | static int gred_offload_dump_stats(struct Qdisc *sch) |
353 | { | |
354 | struct gred_sched *table = qdisc_priv(sch); | |
355 | struct tc_gred_qopt_offload *hw_stats; | |
356 | unsigned int i; | |
357 | int ret; | |
358 | ||
359 | hw_stats = kzalloc(sizeof(*hw_stats), GFP_KERNEL); | |
360 | if (!hw_stats) | |
361 | return -ENOMEM; | |
362 | ||
363 | hw_stats->command = TC_GRED_STATS; | |
364 | hw_stats->handle = sch->handle; | |
365 | hw_stats->parent = sch->parent; | |
366 | ||
367 | for (i = 0; i < MAX_DPs; i++) | |
368 | if (table->tab[i]) | |
369 | hw_stats->stats.xstats[i] = &table->tab[i]->stats; | |
370 | ||
371 | ret = qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_GRED, hw_stats); | |
372 | /* Even if driver returns failure adjust the stats - in case offload | |
373 | * ended but driver still wants to adjust the values. | |
374 | */ | |
375 | for (i = 0; i < MAX_DPs; i++) { | |
376 | if (!table->tab[i]) | |
377 | continue; | |
378 | table->tab[i]->packetsin += hw_stats->stats.bstats[i].packets; | |
379 | table->tab[i]->bytesin += hw_stats->stats.bstats[i].bytes; | |
380 | table->tab[i]->backlog += hw_stats->stats.qstats[i].backlog; | |
381 | ||
382 | _bstats_update(&sch->bstats, | |
383 | hw_stats->stats.bstats[i].bytes, | |
384 | hw_stats->stats.bstats[i].packets); | |
385 | sch->qstats.qlen += hw_stats->stats.qstats[i].qlen; | |
386 | sch->qstats.backlog += hw_stats->stats.qstats[i].backlog; | |
387 | sch->qstats.drops += hw_stats->stats.qstats[i].drops; | |
388 | sch->qstats.requeues += hw_stats->stats.qstats[i].requeues; | |
389 | sch->qstats.overlimits += hw_stats->stats.qstats[i].overlimits; | |
390 | } | |
391 | ||
392 | kfree(hw_stats); | |
393 | return ret; | |
394 | } | |
395 | ||
6639607e TG |
396 | static inline void gred_destroy_vq(struct gred_sched_data *q) |
397 | { | |
398 | kfree(q); | |
399 | } | |
400 | ||
4777be08 JK |
401 | static int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps, |
402 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
403 | { |
404 | struct gred_sched *table = qdisc_priv(sch); | |
1da177e4 | 405 | struct tc_gred_sopt *sopt; |
25fc1989 | 406 | bool red_flags_changed; |
6639607e | 407 | int i; |
1da177e4 | 408 | |
ac8ef4ab | 409 | if (!dps) |
1da177e4 LT |
410 | return -EINVAL; |
411 | ||
1e90474c | 412 | sopt = nla_data(dps); |
1da177e4 | 413 | |
4777be08 JK |
414 | if (sopt->DPs > MAX_DPs) { |
415 | NL_SET_ERR_MSG_MOD(extack, "number of virtual queues too high"); | |
6639607e | 416 | return -EINVAL; |
4777be08 JK |
417 | } |
418 | if (sopt->DPs == 0) { | |
419 | NL_SET_ERR_MSG_MOD(extack, | |
420 | "number of virtual queues can't be 0"); | |
421 | return -EINVAL; | |
422 | } | |
423 | if (sopt->def_DP >= sopt->DPs) { | |
424 | NL_SET_ERR_MSG_MOD(extack, "default virtual queue above virtual queue count"); | |
425 | return -EINVAL; | |
426 | } | |
72111015 JK |
427 | if (sopt->flags && gred_per_vq_red_flags_used(table)) { |
428 | NL_SET_ERR_MSG_MOD(extack, "can't set per-Qdisc RED flags when per-virtual queue flags are used"); | |
429 | return -EINVAL; | |
430 | } | |
1da177e4 | 431 | |
6639607e TG |
432 | sch_tree_lock(sch); |
433 | table->DPs = sopt->DPs; | |
434 | table->def = sopt->def_DP; | |
25fc1989 | 435 | red_flags_changed = table->red_flags != sopt->flags; |
b38c7eef | 436 | table->red_flags = sopt->flags; |
dea3f628 | 437 | |
6639607e TG |
438 | /* |
439 | * Every entry point to GRED is synchronized with the above code | |
440 | * and the DP is checked against DPs, i.e. shadowed VQs can no | |
441 | * longer be found so we can unlock right here. | |
442 | */ | |
443 | sch_tree_unlock(sch); | |
dea3f628 | 444 | |
6639607e TG |
445 | if (sopt->grio) { |
446 | gred_enable_rio_mode(table); | |
447 | gred_disable_wred_mode(table); | |
448 | if (gred_wred_mode_check(sch)) | |
449 | gred_enable_wred_mode(table); | |
450 | } else { | |
451 | gred_disable_rio_mode(table); | |
452 | gred_disable_wred_mode(table); | |
453 | } | |
454 | ||
25fc1989 JK |
455 | if (red_flags_changed) |
456 | for (i = 0; i < table->DPs; i++) | |
457 | if (table->tab[i]) | |
458 | table->tab[i]->red_flags = | |
459 | table->red_flags & GRED_VQ_RED_FLAGS; | |
460 | ||
6639607e TG |
461 | for (i = table->DPs; i < MAX_DPs; i++) { |
462 | if (table->tab[i]) { | |
c17988a9 YY |
463 | pr_warn("GRED: Warning: Destroying shadowed VQ 0x%x\n", |
464 | i); | |
6639607e TG |
465 | gred_destroy_vq(table->tab[i]); |
466 | table->tab[i] = NULL; | |
10297b99 | 467 | } |
6639607e | 468 | } |
1da177e4 | 469 | |
890d8d23 | 470 | gred_offload(sch, TC_GRED_REPLACE); |
6639607e TG |
471 | return 0; |
472 | } | |
473 | ||
f62d6b93 | 474 | static inline int gred_change_vq(struct Qdisc *sch, int dp, |
a73ed26b | 475 | struct tc_gred_qopt *ctl, int prio, |
869aa410 | 476 | u8 *stab, u32 max_P, |
4777be08 JK |
477 | struct gred_sched_data **prealloc, |
478 | struct netlink_ext_ack *extack) | |
6639607e TG |
479 | { |
480 | struct gred_sched *table = qdisc_priv(sch); | |
869aa410 | 481 | struct gred_sched_data *q = table->tab[dp]; |
f62d6b93 | 482 | |
4777be08 JK |
483 | if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) { |
484 | NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters"); | |
8afa10cb | 485 | return -EINVAL; |
4777be08 | 486 | } |
8afa10cb | 487 | |
869aa410 ED |
488 | if (!q) { |
489 | table->tab[dp] = q = *prealloc; | |
490 | *prealloc = NULL; | |
491 | if (!q) | |
f62d6b93 | 492 | return -ENOMEM; |
25fc1989 | 493 | q->red_flags = table->red_flags & GRED_VQ_RED_FLAGS; |
f62d6b93 TG |
494 | } |
495 | ||
f62d6b93 TG |
496 | q->DP = dp; |
497 | q->prio = prio; | |
a3eb95f8 DW |
498 | if (ctl->limit > sch->limit) |
499 | q->limit = sch->limit; | |
500 | else | |
501 | q->limit = ctl->limit; | |
22b33429 TG |
502 | |
503 | if (q->backlog == 0) | |
eeca6688 | 504 | red_end_of_idle_period(&q->vars); |
22b33429 TG |
505 | |
506 | red_set_parms(&q->parms, | |
507 | ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, | |
a73ed26b | 508 | ctl->Scell_log, stab, max_P); |
eeca6688 | 509 | red_set_vars(&q->vars); |
f62d6b93 TG |
510 | return 0; |
511 | } | |
512 | ||
72111015 JK |
513 | static const struct nla_policy gred_vq_policy[TCA_GRED_VQ_MAX + 1] = { |
514 | [TCA_GRED_VQ_DP] = { .type = NLA_U32 }, | |
515 | [TCA_GRED_VQ_FLAGS] = { .type = NLA_U32 }, | |
516 | }; | |
517 | ||
518 | static const struct nla_policy gred_vqe_policy[TCA_GRED_VQ_ENTRY_MAX + 1] = { | |
519 | [TCA_GRED_VQ_ENTRY] = { .type = NLA_NESTED }, | |
520 | }; | |
521 | ||
27a3421e PM |
522 | static const struct nla_policy gred_policy[TCA_GRED_MAX + 1] = { |
523 | [TCA_GRED_PARMS] = { .len = sizeof(struct tc_gred_qopt) }, | |
524 | [TCA_GRED_STAB] = { .len = 256 }, | |
525 | [TCA_GRED_DPS] = { .len = sizeof(struct tc_gred_sopt) }, | |
a73ed26b | 526 | [TCA_GRED_MAX_P] = { .type = NLA_U32 }, |
a3eb95f8 | 527 | [TCA_GRED_LIMIT] = { .type = NLA_U32 }, |
72111015 | 528 | [TCA_GRED_VQ_LIST] = { .type = NLA_NESTED }, |
27a3421e PM |
529 | }; |
530 | ||
72111015 JK |
531 | static void gred_vq_apply(struct gred_sched *table, const struct nlattr *entry) |
532 | { | |
533 | struct nlattr *tb[TCA_GRED_VQ_MAX + 1]; | |
534 | u32 dp; | |
535 | ||
8cb08174 JB |
536 | nla_parse_nested_deprecated(tb, TCA_GRED_VQ_MAX, entry, |
537 | gred_vq_policy, NULL); | |
72111015 JK |
538 | |
539 | dp = nla_get_u32(tb[TCA_GRED_VQ_DP]); | |
540 | ||
541 | if (tb[TCA_GRED_VQ_FLAGS]) | |
542 | table->tab[dp]->red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]); | |
543 | } | |
544 | ||
545 | static void gred_vqs_apply(struct gred_sched *table, struct nlattr *vqs) | |
546 | { | |
547 | const struct nlattr *attr; | |
548 | int rem; | |
549 | ||
550 | nla_for_each_nested(attr, vqs, rem) { | |
551 | switch (nla_type(attr)) { | |
552 | case TCA_GRED_VQ_ENTRY: | |
553 | gred_vq_apply(table, attr); | |
554 | break; | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
559 | static int gred_vq_validate(struct gred_sched *table, u32 cdp, | |
560 | const struct nlattr *entry, | |
561 | struct netlink_ext_ack *extack) | |
562 | { | |
563 | struct nlattr *tb[TCA_GRED_VQ_MAX + 1]; | |
564 | int err; | |
565 | u32 dp; | |
566 | ||
8cb08174 JB |
567 | err = nla_parse_nested_deprecated(tb, TCA_GRED_VQ_MAX, entry, |
568 | gred_vq_policy, extack); | |
72111015 JK |
569 | if (err < 0) |
570 | return err; | |
571 | ||
572 | if (!tb[TCA_GRED_VQ_DP]) { | |
573 | NL_SET_ERR_MSG_MOD(extack, "Virtual queue with no index specified"); | |
574 | return -EINVAL; | |
575 | } | |
576 | dp = nla_get_u32(tb[TCA_GRED_VQ_DP]); | |
577 | if (dp >= table->DPs) { | |
578 | NL_SET_ERR_MSG_MOD(extack, "Virtual queue with index out of bounds"); | |
579 | return -EINVAL; | |
580 | } | |
581 | if (dp != cdp && !table->tab[dp]) { | |
582 | NL_SET_ERR_MSG_MOD(extack, "Virtual queue not yet instantiated"); | |
583 | return -EINVAL; | |
584 | } | |
585 | ||
586 | if (tb[TCA_GRED_VQ_FLAGS]) { | |
587 | u32 red_flags = nla_get_u32(tb[TCA_GRED_VQ_FLAGS]); | |
588 | ||
589 | if (table->red_flags && table->red_flags != red_flags) { | |
590 | NL_SET_ERR_MSG_MOD(extack, "can't change per-virtual queue RED flags when per-Qdisc flags are used"); | |
591 | return -EINVAL; | |
592 | } | |
593 | if (red_flags & ~GRED_VQ_RED_FLAGS) { | |
594 | NL_SET_ERR_MSG_MOD(extack, | |
595 | "invalid RED flags specified"); | |
596 | return -EINVAL; | |
597 | } | |
598 | } | |
599 | ||
600 | return 0; | |
601 | } | |
602 | ||
603 | static int gred_vqs_validate(struct gred_sched *table, u32 cdp, | |
604 | struct nlattr *vqs, struct netlink_ext_ack *extack) | |
605 | { | |
606 | const struct nlattr *attr; | |
607 | int rem, err; | |
608 | ||
8cb08174 JB |
609 | err = nla_validate_nested_deprecated(vqs, TCA_GRED_VQ_ENTRY_MAX, |
610 | gred_vqe_policy, extack); | |
72111015 JK |
611 | if (err < 0) |
612 | return err; | |
613 | ||
614 | nla_for_each_nested(attr, vqs, rem) { | |
615 | switch (nla_type(attr)) { | |
616 | case TCA_GRED_VQ_ENTRY: | |
617 | err = gred_vq_validate(table, cdp, attr, extack); | |
618 | if (err) | |
619 | return err; | |
620 | break; | |
621 | default: | |
622 | NL_SET_ERR_MSG_MOD(extack, "GRED_VQ_LIST can contain only entry attributes"); | |
623 | return -EINVAL; | |
624 | } | |
625 | } | |
626 | ||
627 | if (rem > 0) { | |
628 | NL_SET_ERR_MSG_MOD(extack, "Trailing data after parsing virtual queue list"); | |
629 | return -EINVAL; | |
630 | } | |
631 | ||
632 | return 0; | |
633 | } | |
634 | ||
2030721c AA |
635 | static int gred_change(struct Qdisc *sch, struct nlattr *opt, |
636 | struct netlink_ext_ack *extack) | |
f62d6b93 TG |
637 | { |
638 | struct gred_sched *table = qdisc_priv(sch); | |
6639607e | 639 | struct tc_gred_qopt *ctl; |
1e90474c | 640 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 641 | int err, prio = GRED_DEF_PRIO; |
f62d6b93 | 642 | u8 *stab; |
a73ed26b | 643 | u32 max_P; |
869aa410 | 644 | struct gred_sched_data *prealloc; |
6639607e | 645 | |
cee63723 | 646 | if (opt == NULL) |
6639607e TG |
647 | return -EINVAL; |
648 | ||
8cb08174 JB |
649 | err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy, |
650 | extack); | |
cee63723 PM |
651 | if (err < 0) |
652 | return err; | |
653 | ||
a3eb95f8 DW |
654 | if (tb[TCA_GRED_PARMS] == NULL && tb[TCA_GRED_STAB] == NULL) { |
655 | if (tb[TCA_GRED_LIMIT] != NULL) | |
656 | sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]); | |
4777be08 | 657 | return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack); |
a3eb95f8 | 658 | } |
1da177e4 | 659 | |
1e90474c | 660 | if (tb[TCA_GRED_PARMS] == NULL || |
a3eb95f8 | 661 | tb[TCA_GRED_STAB] == NULL || |
4777be08 JK |
662 | tb[TCA_GRED_LIMIT] != NULL) { |
663 | NL_SET_ERR_MSG_MOD(extack, "can't configure Qdisc and virtual queue at the same time"); | |
f62d6b93 | 664 | return -EINVAL; |
4777be08 | 665 | } |
1da177e4 | 666 | |
a73ed26b ED |
667 | max_P = tb[TCA_GRED_MAX_P] ? nla_get_u32(tb[TCA_GRED_MAX_P]) : 0; |
668 | ||
1e90474c PM |
669 | ctl = nla_data(tb[TCA_GRED_PARMS]); |
670 | stab = nla_data(tb[TCA_GRED_STAB]); | |
a8aaa995 | 671 | |
4777be08 JK |
672 | if (ctl->DP >= table->DPs) { |
673 | NL_SET_ERR_MSG_MOD(extack, "virtual queue index above virtual queue count"); | |
255f4803 | 674 | return -EINVAL; |
4777be08 | 675 | } |
1da177e4 | 676 | |
72111015 JK |
677 | if (tb[TCA_GRED_VQ_LIST]) { |
678 | err = gred_vqs_validate(table, ctl->DP, tb[TCA_GRED_VQ_LIST], | |
679 | extack); | |
680 | if (err) | |
681 | return err; | |
682 | } | |
683 | ||
d6fd4e96 | 684 | if (gred_rio_mode(table)) { |
f62d6b93 TG |
685 | if (ctl->prio == 0) { |
686 | int def_prio = GRED_DEF_PRIO; | |
687 | ||
688 | if (table->tab[table->def]) | |
689 | def_prio = table->tab[table->def]->prio; | |
690 | ||
691 | printk(KERN_DEBUG "GRED: DP %u does not have a prio " | |
692 | "setting default to %d\n", ctl->DP, def_prio); | |
693 | ||
694 | prio = def_prio; | |
695 | } else | |
696 | prio = ctl->prio; | |
1da177e4 LT |
697 | } |
698 | ||
869aa410 | 699 | prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL); |
f62d6b93 | 700 | sch_tree_lock(sch); |
1da177e4 | 701 | |
4777be08 JK |
702 | err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc, |
703 | extack); | |
f62d6b93 | 704 | if (err < 0) |
255f4803 | 705 | goto err_unlock_free; |
1da177e4 | 706 | |
72111015 JK |
707 | if (tb[TCA_GRED_VQ_LIST]) |
708 | gred_vqs_apply(table, tb[TCA_GRED_VQ_LIST]); | |
709 | ||
d6fd4e96 | 710 | if (gred_rio_mode(table)) { |
dea3f628 TG |
711 | gred_disable_wred_mode(table); |
712 | if (gred_wred_mode_check(sch)) | |
713 | gred_enable_wred_mode(table); | |
1da177e4 LT |
714 | } |
715 | ||
255f4803 JK |
716 | sch_tree_unlock(sch); |
717 | kfree(prealloc); | |
890d8d23 JK |
718 | |
719 | gred_offload(sch, TC_GRED_REPLACE); | |
255f4803 | 720 | return 0; |
1da177e4 | 721 | |
255f4803 | 722 | err_unlock_free: |
f62d6b93 | 723 | sch_tree_unlock(sch); |
869aa410 | 724 | kfree(prealloc); |
f62d6b93 | 725 | return err; |
1da177e4 LT |
726 | } |
727 | ||
e63d7dfd AA |
728 | static int gred_init(struct Qdisc *sch, struct nlattr *opt, |
729 | struct netlink_ext_ack *extack) | |
1da177e4 | 730 | { |
1e90474c | 731 | struct nlattr *tb[TCA_GRED_MAX + 1]; |
cee63723 | 732 | int err; |
1da177e4 | 733 | |
ac8ef4ab | 734 | if (!opt) |
1da177e4 LT |
735 | return -EINVAL; |
736 | ||
8cb08174 JB |
737 | err = nla_parse_nested_deprecated(tb, TCA_GRED_MAX, opt, gred_policy, |
738 | extack); | |
cee63723 PM |
739 | if (err < 0) |
740 | return err; | |
741 | ||
4777be08 JK |
742 | if (tb[TCA_GRED_PARMS] || tb[TCA_GRED_STAB]) { |
743 | NL_SET_ERR_MSG_MOD(extack, | |
744 | "virtual queue configuration can't be specified at initialization time"); | |
6639607e | 745 | return -EINVAL; |
4777be08 | 746 | } |
1da177e4 | 747 | |
a3eb95f8 DW |
748 | if (tb[TCA_GRED_LIMIT]) |
749 | sch->limit = nla_get_u32(tb[TCA_GRED_LIMIT]); | |
348e3435 PS |
750 | else |
751 | sch->limit = qdisc_dev(sch)->tx_queue_len | |
752 | * psched_mtu(qdisc_dev(sch)); | |
a3eb95f8 | 753 | |
4777be08 | 754 | return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack); |
1da177e4 LT |
755 | } |
756 | ||
757 | static int gred_dump(struct Qdisc *sch, struct sk_buff *skb) | |
758 | { | |
1da177e4 | 759 | struct gred_sched *table = qdisc_priv(sch); |
80e22e96 | 760 | struct nlattr *parms, *vqs, *opts = NULL; |
1da177e4 | 761 | int i; |
a73ed26b | 762 | u32 max_p[MAX_DPs]; |
e0636822 TG |
763 | struct tc_gred_sopt sopt = { |
764 | .DPs = table->DPs, | |
765 | .def_DP = table->def, | |
766 | .grio = gred_rio_mode(table), | |
b38c7eef | 767 | .flags = table->red_flags, |
e0636822 | 768 | }; |
1da177e4 | 769 | |
e49efd52 JK |
770 | if (gred_offload_dump_stats(sch)) |
771 | goto nla_put_failure; | |
772 | ||
ae0be8de | 773 | opts = nla_nest_start_noflag(skb, TCA_OPTIONS); |
1e90474c PM |
774 | if (opts == NULL) |
775 | goto nla_put_failure; | |
1b34ec43 DM |
776 | if (nla_put(skb, TCA_GRED_DPS, sizeof(sopt), &sopt)) |
777 | goto nla_put_failure; | |
a73ed26b ED |
778 | |
779 | for (i = 0; i < MAX_DPs; i++) { | |
780 | struct gred_sched_data *q = table->tab[i]; | |
781 | ||
782 | max_p[i] = q ? q->parms.max_P : 0; | |
783 | } | |
1b34ec43 DM |
784 | if (nla_put(skb, TCA_GRED_MAX_P, sizeof(max_p), max_p)) |
785 | goto nla_put_failure; | |
a73ed26b | 786 | |
a3eb95f8 DW |
787 | if (nla_put_u32(skb, TCA_GRED_LIMIT, sch->limit)) |
788 | goto nla_put_failure; | |
789 | ||
80e22e96 | 790 | /* Old style all-in-one dump of VQs */ |
ae0be8de | 791 | parms = nla_nest_start_noflag(skb, TCA_GRED_PARMS); |
1e90474c PM |
792 | if (parms == NULL) |
793 | goto nla_put_failure; | |
1da177e4 | 794 | |
05f1cc01 TG |
795 | for (i = 0; i < MAX_DPs; i++) { |
796 | struct gred_sched_data *q = table->tab[i]; | |
797 | struct tc_gred_qopt opt; | |
1fe37b10 | 798 | unsigned long qavg; |
1da177e4 | 799 | |
05f1cc01 | 800 | memset(&opt, 0, sizeof(opt)); |
1da177e4 LT |
801 | |
802 | if (!q) { | |
803 | /* hack -- fix at some point with proper message | |
804 | This is how we indicate to tc that there is no VQ | |
805 | at this DP */ | |
806 | ||
05f1cc01 TG |
807 | opt.DP = MAX_DPs + i; |
808 | goto append_opt; | |
1da177e4 LT |
809 | } |
810 | ||
05f1cc01 TG |
811 | opt.limit = q->limit; |
812 | opt.DP = q->DP; | |
145a42b3 | 813 | opt.backlog = gred_backlog(table, q, sch); |
05f1cc01 | 814 | opt.prio = q->prio; |
22b33429 TG |
815 | opt.qth_min = q->parms.qth_min >> q->parms.Wlog; |
816 | opt.qth_max = q->parms.qth_max >> q->parms.Wlog; | |
817 | opt.Wlog = q->parms.Wlog; | |
818 | opt.Plog = q->parms.Plog; | |
819 | opt.Scell_log = q->parms.Scell_log; | |
820 | opt.other = q->stats.other; | |
821 | opt.early = q->stats.prob_drop; | |
822 | opt.forced = q->stats.forced_drop; | |
823 | opt.pdrop = q->stats.pdrop; | |
05f1cc01 TG |
824 | opt.packets = q->packetsin; |
825 | opt.bytesin = q->bytesin; | |
826 | ||
244b65db DW |
827 | if (gred_wred_mode(table)) |
828 | gred_load_wred_set(table, q); | |
05f1cc01 | 829 | |
1fe37b10 DW |
830 | qavg = red_calc_qavg(&q->parms, &q->vars, |
831 | q->vars.qavg >> q->parms.Wlog); | |
832 | opt.qave = qavg >> q->parms.Wlog; | |
22b33429 | 833 | |
05f1cc01 | 834 | append_opt: |
1e90474c PM |
835 | if (nla_append(skb, sizeof(opt), &opt) < 0) |
836 | goto nla_put_failure; | |
1da177e4 LT |
837 | } |
838 | ||
1e90474c | 839 | nla_nest_end(skb, parms); |
1da177e4 | 840 | |
80e22e96 | 841 | /* Dump the VQs again, in more structured way */ |
ae0be8de | 842 | vqs = nla_nest_start_noflag(skb, TCA_GRED_VQ_LIST); |
80e22e96 JK |
843 | if (!vqs) |
844 | goto nla_put_failure; | |
845 | ||
846 | for (i = 0; i < MAX_DPs; i++) { | |
847 | struct gred_sched_data *q = table->tab[i]; | |
848 | struct nlattr *vq; | |
849 | ||
850 | if (!q) | |
851 | continue; | |
852 | ||
ae0be8de | 853 | vq = nla_nest_start_noflag(skb, TCA_GRED_VQ_ENTRY); |
80e22e96 JK |
854 | if (!vq) |
855 | goto nla_put_failure; | |
856 | ||
857 | if (nla_put_u32(skb, TCA_GRED_VQ_DP, q->DP)) | |
858 | goto nla_put_failure; | |
859 | ||
72111015 JK |
860 | if (nla_put_u32(skb, TCA_GRED_VQ_FLAGS, q->red_flags)) |
861 | goto nla_put_failure; | |
862 | ||
80e22e96 JK |
863 | /* Stats */ |
864 | if (nla_put_u64_64bit(skb, TCA_GRED_VQ_STAT_BYTES, q->bytesin, | |
865 | TCA_GRED_VQ_PAD)) | |
866 | goto nla_put_failure; | |
867 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PACKETS, q->packetsin)) | |
868 | goto nla_put_failure; | |
869 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_BACKLOG, | |
870 | gred_backlog(table, q, sch))) | |
871 | goto nla_put_failure; | |
872 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_DROP, | |
873 | q->stats.prob_drop)) | |
874 | goto nla_put_failure; | |
875 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PROB_MARK, | |
876 | q->stats.prob_mark)) | |
877 | goto nla_put_failure; | |
878 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_DROP, | |
879 | q->stats.forced_drop)) | |
880 | goto nla_put_failure; | |
881 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_FORCED_MARK, | |
882 | q->stats.forced_mark)) | |
883 | goto nla_put_failure; | |
884 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_PDROP, q->stats.pdrop)) | |
885 | goto nla_put_failure; | |
886 | if (nla_put_u32(skb, TCA_GRED_VQ_STAT_OTHER, q->stats.other)) | |
887 | goto nla_put_failure; | |
888 | ||
889 | nla_nest_end(skb, vq); | |
890 | } | |
891 | nla_nest_end(skb, vqs); | |
892 | ||
1e90474c | 893 | return nla_nest_end(skb, opts); |
1da177e4 | 894 | |
1e90474c | 895 | nla_put_failure: |
bc3ed28c TG |
896 | nla_nest_cancel(skb, opts); |
897 | return -EMSGSIZE; | |
1da177e4 LT |
898 | } |
899 | ||
900 | static void gred_destroy(struct Qdisc *sch) | |
901 | { | |
902 | struct gred_sched *table = qdisc_priv(sch); | |
903 | int i; | |
904 | ||
1e4dfaf9 | 905 | for (i = 0; i < table->DPs; i++) { |
1da177e4 | 906 | if (table->tab[i]) |
6639607e | 907 | gred_destroy_vq(table->tab[i]); |
1da177e4 | 908 | } |
890d8d23 | 909 | gred_offload(sch, TC_GRED_DESTROY); |
1da177e4 LT |
910 | } |
911 | ||
20fea08b | 912 | static struct Qdisc_ops gred_qdisc_ops __read_mostly = { |
1da177e4 LT |
913 | .id = "gred", |
914 | .priv_size = sizeof(struct gred_sched), | |
915 | .enqueue = gred_enqueue, | |
916 | .dequeue = gred_dequeue, | |
8e3af978 | 917 | .peek = qdisc_peek_head, |
1da177e4 LT |
918 | .init = gred_init, |
919 | .reset = gred_reset, | |
920 | .destroy = gred_destroy, | |
921 | .change = gred_change, | |
922 | .dump = gred_dump, | |
923 | .owner = THIS_MODULE, | |
924 | }; | |
925 | ||
926 | static int __init gred_module_init(void) | |
927 | { | |
928 | return register_qdisc(&gred_qdisc_ops); | |
929 | } | |
1e4dfaf9 TG |
930 | |
931 | static void __exit gred_module_exit(void) | |
1da177e4 LT |
932 | { |
933 | unregister_qdisc(&gred_qdisc_ops); | |
934 | } | |
1e4dfaf9 | 935 | |
1da177e4 LT |
936 | module_init(gred_module_init) |
937 | module_exit(gred_module_exit) | |
1e4dfaf9 | 938 | |
1da177e4 | 939 | MODULE_LICENSE("GPL"); |