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1 /*
2 * q_gred.c GRED.
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: J Hadi Salim(hadi@nortelnetworks.com)
10 * code ruthlessly ripped from
11 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 *
13 */
14
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <unistd.h>
18 #include <fcntl.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22 #include <string.h>
23 #include <math.h>
24
25 #include "utils.h"
26 #include "tc_util.h"
27
28 #include "tc_red.h"
29
30
31 #if 0
32 #define DPRINTF(format, args...) fprintf(stderr, format, ##args)
33 #else
34 #define DPRINTF(format, args...)
35 #endif
36
37 static void explain(void)
38 {
39 fprintf(stderr,
40 "Usage: tc qdisc { add | replace | change } ... gred setup vqs NUMBER\n"
41 " default DEFAULT_VQ [ grio ] [ limit BYTES ] [ecn] [harddrop]\n"
42 " tc qdisc change ... gred vq VQ [ prio VALUE ] limit BYTES\n"
43 " min BYTES max BYTES avpkt BYTES [ burst PACKETS ]\n"
44 " [ probability PROBABILITY ] [ bandwidth KBPS ] [ecn] [harddrop]\n");
45 }
46
47 static int init_gred(struct qdisc_util *qu, int argc, char **argv,
48 struct nlmsghdr *n)
49 {
50
51 struct rtattr *tail;
52 struct tc_gred_sopt opt = { 0 };
53 __u32 limit = 0;
54
55 opt.def_DP = MAX_DPs;
56
57 while (argc > 0) {
58 DPRINTF(stderr, "init_gred: invoked with %s\n", *argv);
59 if (strcmp(*argv, "vqs") == 0 ||
60 strcmp(*argv, "DPs") == 0) {
61 NEXT_ARG();
62 if (get_unsigned(&opt.DPs, *argv, 10)) {
63 fprintf(stderr, "Illegal \"vqs\"\n");
64 return -1;
65 } else if (opt.DPs > MAX_DPs) {
66 fprintf(stderr, "GRED: only %u VQs are currently supported\n",
67 MAX_DPs);
68 return -1;
69 }
70 } else if (strcmp(*argv, "default") == 0) {
71 if (opt.DPs == 0) {
72 fprintf(stderr, "\"default\" must be defined after \"vqs\"\n");
73 return -1;
74 }
75 NEXT_ARG();
76 if (get_unsigned(&opt.def_DP, *argv, 10)) {
77 fprintf(stderr, "Illegal \"default\"\n");
78 return -1;
79 } else if (opt.def_DP >= opt.DPs) {
80 fprintf(stderr, "\"default\" must be less than \"vqs\"\n");
81 return -1;
82 }
83 } else if (strcmp(*argv, "grio") == 0) {
84 opt.grio = 1;
85 } else if (strcmp(*argv, "limit") == 0) {
86 NEXT_ARG();
87 if (get_size(&limit, *argv)) {
88 fprintf(stderr, "Illegal \"limit\"\n");
89 return -1;
90 }
91 } else if (strcmp(*argv, "ecn") == 0) {
92 opt.flags |= TC_RED_ECN;
93 } else if (strcmp(*argv, "harddrop") == 0) {
94 opt.flags |= TC_RED_HARDDROP;
95 } else if (strcmp(*argv, "help") == 0) {
96 explain();
97 return -1;
98 } else {
99 fprintf(stderr, "What is \"%s\"?\n", *argv);
100 explain();
101 return -1;
102 }
103 argc--; argv++;
104 }
105
106 if (!opt.DPs || opt.def_DP == MAX_DPs) {
107 fprintf(stderr, "Illegal gred setup parameters\n");
108 return -1;
109 }
110
111 DPRINTF("TC_GRED: sending DPs=%u def_DP=%u\n", opt.DPs, opt.def_DP);
112 n->nlmsg_flags |= NLM_F_CREATE;
113 tail = addattr_nest(n, 1024, TCA_OPTIONS);
114 addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
115 if (limit)
116 addattr32(n, 1024, TCA_GRED_LIMIT, limit);
117 addattr_nest_end(n, tail);
118 return 0;
119 }
120 /*
121 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
122 */
123 static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
124 {
125 struct rtattr *tail, *entry, *vqs;
126 int ok = 0;
127 struct tc_gred_qopt opt = { 0 };
128 unsigned int burst = 0;
129 unsigned int avpkt = 0;
130 unsigned int flags = 0;
131 double probability = 0.02;
132 unsigned int rate = 0;
133 int parm;
134 __u8 sbuf[256];
135 __u32 max_P;
136
137 opt.DP = MAX_DPs;
138
139 while (argc > 0) {
140 if (strcmp(*argv, "limit") == 0) {
141 NEXT_ARG();
142 if (get_size(&opt.limit, *argv)) {
143 fprintf(stderr, "Illegal \"limit\"\n");
144 return -1;
145 }
146 ok++;
147 } else if (strcmp(*argv, "setup") == 0) {
148 if (ok) {
149 fprintf(stderr, "Illegal \"setup\"\n");
150 return -1;
151 }
152 return init_gred(qu, argc-1, argv+1, n);
153 } else if (strcmp(*argv, "min") == 0) {
154 NEXT_ARG();
155 if (get_size(&opt.qth_min, *argv)) {
156 fprintf(stderr, "Illegal \"min\"\n");
157 return -1;
158 }
159 ok++;
160 } else if (strcmp(*argv, "max") == 0) {
161 NEXT_ARG();
162 if (get_size(&opt.qth_max, *argv)) {
163 fprintf(stderr, "Illegal \"max\"\n");
164 return -1;
165 }
166 ok++;
167 } else if (strcmp(*argv, "vq") == 0 ||
168 strcmp(*argv, "DP") == 0) {
169 NEXT_ARG();
170 if (get_unsigned(&opt.DP, *argv, 10)) {
171 fprintf(stderr, "Illegal \"vq\"\n");
172 return -1;
173 } else if (opt.DP >= MAX_DPs) {
174 fprintf(stderr, "GRED: only %u VQs are currently supported\n",
175 MAX_DPs);
176 return -1;
177 } /* need a better error check */
178 ok++;
179 } else if (strcmp(*argv, "burst") == 0) {
180 NEXT_ARG();
181 if (get_unsigned(&burst, *argv, 0)) {
182 fprintf(stderr, "Illegal \"burst\"\n");
183 return -1;
184 }
185 ok++;
186 } else if (strcmp(*argv, "avpkt") == 0) {
187 NEXT_ARG();
188 if (get_size(&avpkt, *argv)) {
189 fprintf(stderr, "Illegal \"avpkt\"\n");
190 return -1;
191 }
192 ok++;
193 } else if (strcmp(*argv, "probability") == 0) {
194 NEXT_ARG();
195 if (sscanf(*argv, "%lg", &probability) != 1) {
196 fprintf(stderr, "Illegal \"probability\"\n");
197 return -1;
198 }
199 ok++;
200 } else if (strcmp(*argv, "prio") == 0) {
201 NEXT_ARG();
202 opt.prio = strtol(*argv, (char **)NULL, 10);
203 /* some error check here */
204 ok++;
205 } else if (strcmp(*argv, "bandwidth") == 0) {
206 NEXT_ARG();
207 if (strchr(*argv, '%')) {
208 if (get_percent_rate(&rate, *argv, dev)) {
209 fprintf(stderr, "Illegal \"bandwidth\"\n");
210 return -1;
211 }
212 } else if (get_rate(&rate, *argv)) {
213 fprintf(stderr, "Illegal \"bandwidth\"\n");
214 return -1;
215 }
216 ok++;
217 } else if (strcmp(*argv, "ecn") == 0) {
218 flags |= TC_RED_ECN;
219 } else if (strcmp(*argv, "harddrop") == 0) {
220 flags |= TC_RED_HARDDROP;
221 } else if (strcmp(*argv, "help") == 0) {
222 explain();
223 return -1;
224 } else {
225 fprintf(stderr, "What is \"%s\"?\n", *argv);
226 explain();
227 return -1;
228 }
229 argc--; argv++;
230 }
231
232 if (!ok) {
233 explain();
234 return -1;
235 }
236 if (opt.DP == MAX_DPs || !opt.limit || !opt.qth_min || !opt.qth_max ||
237 !avpkt) {
238 fprintf(stderr, "Required parameter (vq, limit, min, max, avpkt) is missing\n");
239 return -1;
240 }
241 if (!burst) {
242 burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
243 fprintf(stderr, "GRED: set burst to %u\n", burst);
244 }
245 if (!rate) {
246 get_rate(&rate, "10Mbit");
247 fprintf(stderr, "GRED: set bandwidth to 10Mbit\n");
248 }
249 if ((parm = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
250 fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
251 return -1;
252 }
253 if (parm >= 10)
254 fprintf(stderr, "GRED: WARNING. Burst %u seems to be too large.\n",
255 burst);
256 opt.Wlog = parm;
257 if ((parm = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
258 fprintf(stderr, "GRED: failed to calculate probability.\n");
259 return -1;
260 }
261 opt.Plog = parm;
262 if ((parm = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
263 {
264 fprintf(stderr, "GRED: failed to calculate idle damping table.\n");
265 return -1;
266 }
267 opt.Scell_log = parm;
268
269 tail = addattr_nest(n, 1024, TCA_OPTIONS);
270 addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
271 addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
272 max_P = probability * pow(2, 32);
273 addattr32(n, 1024, TCA_GRED_MAX_P, max_P);
274
275 vqs = addattr_nest(n, 1024, TCA_GRED_VQ_LIST);
276 entry = addattr_nest(n, 1024, TCA_GRED_VQ_ENTRY);
277 addattr32(n, 1024, TCA_GRED_VQ_DP, opt.DP);
278 addattr32(n, 1024, TCA_GRED_VQ_FLAGS, flags);
279 addattr_nest_end(n, entry);
280 addattr_nest_end(n, vqs);
281
282 addattr_nest_end(n, tail);
283 return 0;
284 }
285
286 struct tc_gred_info {
287 bool flags_present;
288 __u64 bytes;
289 __u32 packets;
290 __u32 backlog;
291 __u32 prob_drop;
292 __u32 prob_mark;
293 __u32 forced_drop;
294 __u32 forced_mark;
295 __u32 pdrop;
296 __u32 other;
297 __u32 flags;
298 };
299
300 static void
301 gred_parse_vqs(struct tc_gred_info *info, struct rtattr *vqs)
302 {
303 int rem = RTA_PAYLOAD(vqs);
304 unsigned int offset = 0;
305
306 while (rem > offset) {
307 struct rtattr *tb_entry[TCA_GRED_VQ_ENTRY_MAX + 1] = {};
308 struct rtattr *tb[TCA_GRED_VQ_MAX + 1] = {};
309 struct rtattr *entry;
310 unsigned int len;
311 unsigned int dp;
312
313 entry = RTA_DATA(vqs) + offset;
314
315 parse_rtattr(tb_entry, TCA_GRED_VQ_ENTRY_MAX, entry,
316 rem - offset);
317 len = RTA_LENGTH(RTA_PAYLOAD(entry));
318 offset += len;
319
320 if (!tb_entry[TCA_GRED_VQ_ENTRY]) {
321 fprintf(stderr,
322 "ERROR: Failed to parse Virtual Queue entry\n");
323 continue;
324 }
325
326 parse_rtattr_nested(tb, TCA_GRED_VQ_MAX,
327 tb_entry[TCA_GRED_VQ_ENTRY]);
328
329 if (!tb[TCA_GRED_VQ_DP]) {
330 fprintf(stderr,
331 "ERROR: Virtual Queue without DP attribute\n");
332 continue;
333 }
334
335 dp = rta_getattr_u32(tb[TCA_GRED_VQ_DP]);
336
337 if (tb[TCA_GRED_VQ_STAT_BYTES])
338 info[dp].bytes =
339 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_BYTES]);
340 if (tb[TCA_GRED_VQ_STAT_PACKETS])
341 info[dp].packets =
342 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PACKETS]);
343 if (tb[TCA_GRED_VQ_STAT_BACKLOG])
344 info[dp].backlog =
345 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_BACKLOG]);
346 if (tb[TCA_GRED_VQ_STAT_PROB_DROP])
347 info[dp].prob_drop =
348 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PROB_DROP]);
349 if (tb[TCA_GRED_VQ_STAT_PROB_MARK])
350 info[dp].prob_mark =
351 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PROB_MARK]);
352 if (tb[TCA_GRED_VQ_STAT_FORCED_DROP])
353 info[dp].forced_drop =
354 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_FORCED_DROP]);
355 if (tb[TCA_GRED_VQ_STAT_FORCED_MARK])
356 info[dp].forced_mark =
357 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_FORCED_MARK]);
358 if (tb[TCA_GRED_VQ_STAT_PDROP])
359 info[dp].pdrop =
360 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_PDROP]);
361 if (tb[TCA_GRED_VQ_STAT_OTHER])
362 info[dp].other =
363 rta_getattr_u32(tb[TCA_GRED_VQ_STAT_OTHER]);
364 info[dp].flags_present = !!tb[TCA_GRED_VQ_FLAGS];
365 if (tb[TCA_GRED_VQ_FLAGS])
366 info[dp].flags =
367 rta_getattr_u32(tb[TCA_GRED_VQ_FLAGS]);
368 }
369 }
370
371 static void
372 gred_print_stats(struct tc_gred_info *info, struct tc_gred_qopt *qopt)
373 {
374 __u64 bytes = info ? info->bytes : qopt->bytesin;
375
376 SPRINT_BUF(b1);
377
378 if (!is_json_context())
379 printf("\n Queue size: ");
380
381 print_uint(PRINT_JSON, "qave", NULL, qopt->qave);
382 print_string(PRINT_FP, NULL, "average %s ",
383 sprint_size(qopt->qave, b1));
384
385 print_uint(PRINT_JSON, "backlog", NULL, qopt->backlog);
386 print_string(PRINT_FP, NULL, "current %s ",
387 sprint_size(qopt->backlog, b1));
388
389 if (!is_json_context())
390 printf("\n Dropped packets: ");
391
392 if (info) {
393 print_uint(PRINT_ANY, "forced_drop", "forced %u ",
394 info->forced_drop);
395 print_uint(PRINT_ANY, "prob_drop", "early %u ",
396 info->prob_drop);
397 print_uint(PRINT_ANY, "pdrop", "pdrop %u ", info->pdrop);
398 print_uint(PRINT_ANY, "other", "other %u ", info->other);
399
400 if (!is_json_context())
401 printf("\n Marked packets: ");
402 print_uint(PRINT_ANY, "forced_mark", "forced %u ",
403 info->forced_mark);
404 print_uint(PRINT_ANY, "prob_mark", "early %u ",
405 info->prob_mark);
406 } else {
407 print_uint(PRINT_ANY, "forced_drop", "forced %u ",
408 qopt->forced);
409 print_uint(PRINT_ANY, "prob_drop", "early %u ", qopt->early);
410 print_uint(PRINT_ANY, "pdrop", "pdrop %u ", qopt->pdrop);
411 print_uint(PRINT_ANY, "other", "other %u ", qopt->other);
412 }
413
414 if (!is_json_context())
415 printf("\n Total packets: ");
416
417 print_uint(PRINT_ANY, "packets", "%u ", qopt->packets);
418
419 print_uint(PRINT_JSON, "bytes", NULL, bytes);
420 print_string(PRINT_FP, NULL, "(%s) ", sprint_size(bytes, b1));
421 }
422
423 static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
424 {
425 struct tc_gred_info infos[MAX_DPs] = {};
426 struct rtattr *tb[TCA_GRED_MAX + 1];
427 struct tc_gred_sopt *sopt;
428 struct tc_gred_qopt *qopt;
429 bool vq_info = false;
430 __u32 *max_p = NULL;
431 __u32 *limit = NULL;
432 unsigned int i;
433
434 SPRINT_BUF(b1);
435
436 if (opt == NULL)
437 return 0;
438
439 parse_rtattr_nested(tb, TCA_GRED_MAX, opt);
440
441 if (tb[TCA_GRED_PARMS] == NULL)
442 return -1;
443
444 if (tb[TCA_GRED_MAX_P] &&
445 RTA_PAYLOAD(tb[TCA_GRED_MAX_P]) >= sizeof(__u32) * MAX_DPs)
446 max_p = RTA_DATA(tb[TCA_GRED_MAX_P]);
447
448 if (tb[TCA_GRED_LIMIT] &&
449 RTA_PAYLOAD(tb[TCA_GRED_LIMIT]) == sizeof(__u32))
450 limit = RTA_DATA(tb[TCA_GRED_LIMIT]);
451
452 sopt = RTA_DATA(tb[TCA_GRED_DPS]);
453 qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
454 if (RTA_PAYLOAD(tb[TCA_GRED_DPS]) < sizeof(*sopt) ||
455 RTA_PAYLOAD(tb[TCA_GRED_PARMS]) < sizeof(*qopt)*MAX_DPs) {
456 fprintf(f, "\n GRED received message smaller than expected\n");
457 return -1;
458 }
459
460 if (tb[TCA_GRED_VQ_LIST]) {
461 gred_parse_vqs(infos, tb[TCA_GRED_VQ_LIST]);
462 vq_info = true;
463 }
464
465 print_uint(PRINT_ANY, "dp_cnt", "vqs %u ", sopt->DPs);
466 print_uint(PRINT_ANY, "dp_default", "default %u ", sopt->def_DP);
467
468 if (sopt->grio)
469 print_bool(PRINT_ANY, "grio", "grio ", true);
470 else
471 print_bool(PRINT_ANY, "grio", NULL, false);
472
473 if (limit) {
474 print_uint(PRINT_JSON, "limit", NULL, *limit);
475 print_string(PRINT_FP, NULL, "limit %s ",
476 sprint_size(*limit, b1));
477 }
478
479 tc_red_print_flags(sopt->flags);
480
481 open_json_array(PRINT_JSON, "vqs");
482 for (i = 0; i < MAX_DPs; i++, qopt++) {
483 if (qopt->DP >= MAX_DPs)
484 continue;
485
486 open_json_object(NULL);
487
488 print_uint(PRINT_ANY, "vq", "\n vq %u ", qopt->DP);
489 print_hhu(PRINT_ANY, "prio", "prio %hhu ", qopt->prio);
490
491 print_uint(PRINT_JSON, "limit", NULL, qopt->limit);
492 print_string(PRINT_FP, NULL, "limit %s ",
493 sprint_size(qopt->limit, b1));
494
495 print_uint(PRINT_JSON, "min", NULL, qopt->qth_min);
496 print_string(PRINT_FP, NULL, "min %s ",
497 sprint_size(qopt->qth_min, b1));
498
499 print_uint(PRINT_JSON, "max", NULL, qopt->qth_max);
500 print_string(PRINT_FP, NULL, "max %s ",
501 sprint_size(qopt->qth_max, b1));
502
503 if (infos[i].flags_present)
504 tc_red_print_flags(infos[i].flags);
505
506 if (show_details) {
507 print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
508 if (max_p)
509 print_float(PRINT_ANY, "probability",
510 "probability %lg ",
511 max_p[i] / pow(2, 32));
512 else
513 print_uint(PRINT_ANY, "Plog", "Plog %u ",
514 qopt->Plog);
515 print_uint(PRINT_ANY, "Scell_log", "Scell_log %u ",
516 qopt->Scell_log);
517 }
518 if (show_stats)
519 gred_print_stats(vq_info ? &infos[i] : NULL, qopt);
520 close_json_object();
521 }
522 close_json_array(PRINT_JSON, "vqs");
523 return 0;
524 }
525
526 struct qdisc_util gred_qdisc_util = {
527 .id = "gred",
528 .parse_qopt = gred_parse_opt,
529 .print_qopt = gred_print_opt,
530 };
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