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.
9 * Authors: J Hadi Salim(hadi@nortelnetworks.com)
10 * code ruthlessly ripped from
11 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
20 #include <sys/socket.h>
21 #include <netinet/in.h>
22 #include <arpa/inet.h>
33 #define DPRINTF(format,args...) fprintf(stderr,format,##args)
35 #define DPRINTF(format,args...)
38 static void explain(void)
40 fprintf(stderr, "Usage: ... gred DP drop-probability limit BYTES "
41 "min BYTES max BYTES\n");
42 fprintf(stderr, " avpkt BYTES burst PACKETS probability PROBABILITY "
44 fprintf(stderr, " [prio value]\n");
45 fprintf(stderr," OR ...\n");
46 fprintf(stderr," gred setup DPs <num of DPs> default <default DP> "
50 static int init_gred(struct qdisc_util *qu, int argc, char **argv,
55 struct tc_gred_sopt opt = { 0 };
60 DPRINTF(stderr,"init_gred: invoked with %s\n",*argv);
61 if (strcmp(*argv, "DPs") == 0) {
63 DPRINTF(stderr,"init_gred: next_arg with %s\n",*argv);
64 dps = strtol(*argv, (char **)NULL, 10);
65 if (dps < 0 || dps >MAX_DPs) {
66 fprintf(stderr, "DPs =%d\n", dps);
67 fprintf(stderr, "Illegal \"DPs\"\n");
68 fprintf(stderr, "GRED: only %d DPs are "
69 "currently supported\n",MAX_DPs);
72 } else if (strcmp(*argv, "default") == 0) {
74 def_dp = strtol(*argv, (char **)NULL, 10);
76 fprintf(stderr, "\"default DP\" must be "
77 "defined after DPs\n");
80 if (def_dp < 0 || def_dp > dps) {
82 "\"default DP\" must be less than %d\n",
86 } else if (strcmp(*argv, "grio") == 0) {
88 } else if (strcmp(*argv, "help") == 0) {
92 fprintf(stderr, "What is \"%s\"?\n", *argv);
99 if (!dps || def_dp == -1) {
100 fprintf(stderr, "Illegal gred setup parameters \n");
107 DPRINTF("TC_GRED: sending DPs=%d default=%d\n",opt.DPs,opt.def_DP);
108 n->nlmsg_flags|=NLM_F_CREATE;
109 tail = NLMSG_TAIL(n);
110 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
111 addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
112 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
116 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
118 static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
121 struct tc_gred_qopt opt;
124 double probability = 0.02;
131 memset(&opt, 0, sizeof(opt));
134 if (strcmp(*argv, "limit") == 0) {
136 if (get_size(&opt.limit, *argv)) {
137 fprintf(stderr, "Illegal \"limit\"\n");
141 } else if (strcmp(*argv, "setup") == 0) {
143 fprintf(stderr, "Illegal \"setup\"\n");
146 return init_gred(qu,argc-1, argv+1,n);
148 } else if (strcmp(*argv, "min") == 0) {
150 if (get_size(&opt.qth_min, *argv)) {
151 fprintf(stderr, "Illegal \"min\"\n");
155 } else if (strcmp(*argv, "max") == 0) {
157 if (get_size(&opt.qth_max, *argv)) {
158 fprintf(stderr, "Illegal \"max\"\n");
162 } else if (strcmp(*argv, "DP") == 0) {
164 opt.DP=strtol(*argv, (char **)NULL, 10);
165 DPRINTF ("\n ******* DP =%u\n",opt.DP);
166 if (opt.DP >MAX_DPs) { /* need a better error check */
167 fprintf(stderr, "DP =%u \n",opt.DP);
168 fprintf(stderr, "Illegal \"DP\"\n");
169 fprintf(stderr, "GRED: only %d DPs are currently supported\n",MAX_DPs);
173 } else if (strcmp(*argv, "burst") == 0) {
175 if (get_unsigned(&burst, *argv, 0)) {
176 fprintf(stderr, "Illegal \"burst\"\n");
180 } else if (strcmp(*argv, "avpkt") == 0) {
182 if (get_size(&avpkt, *argv)) {
183 fprintf(stderr, "Illegal \"avpkt\"\n");
187 } else if (strcmp(*argv, "probability") == 0) {
189 if (sscanf(*argv, "%lg", &probability) != 1) {
190 fprintf(stderr, "Illegal \"probability\"\n");
194 } else if (strcmp(*argv, "prio") == 0) {
196 opt.prio=strtol(*argv, (char **)NULL, 10);
197 /* some error check here */
199 } else if (strcmp(*argv, "bandwidth") == 0) {
201 if (get_rate(&rate, *argv)) {
202 fprintf(stderr, "Illegal \"bandwidth\"\n");
206 } else if (strcmp(*argv, "help") == 0) {
210 fprintf(stderr, "What is \"%s\"?\n", *argv);
218 get_rate(&rate, "10Mbit");
220 if (!opt.qth_min || !opt.qth_max || !opt.limit || !avpkt ||
222 fprintf(stderr, "Required parameter (min, max, limit, "
223 "avpkt, DP) is missing\n");
227 burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
228 fprintf(stderr, "GRED: set burst to %u\n", burst);
231 if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
232 fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
236 fprintf(stderr, "GRED: WARNING. Burst %d seems to be too "
239 if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
240 fprintf(stderr, "GRED: failed to calculate probability.\n");
244 if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
246 fprintf(stderr, "GRED: failed to calculate idle damping "
250 opt.Scell_log = wlog;
252 tail = NLMSG_TAIL(n);
253 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
254 addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
255 addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
256 max_P = probability * pow(2, 32);
257 addattr32(n, 1024, TCA_GRED_MAX_P, max_P);
258 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
262 static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
264 struct rtattr *tb[TCA_GRED_MAX + 1];
265 struct tc_gred_qopt *qopt;
277 parse_rtattr_nested(tb, TCA_GRED_MAX, opt);
279 if (tb[TCA_GRED_PARMS] == NULL)
282 if (tb[TCA_GRED_MAX_P] &&
283 RTA_PAYLOAD(tb[TCA_GRED_MAX_P]) >= sizeof(__u32) * MAX_DPs)
284 max_p = RTA_DATA(tb[TCA_GRED_MAX_P]);
286 qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
287 if (RTA_PAYLOAD(tb[TCA_GRED_PARMS]) < sizeof(*qopt)*MAX_DPs) {
288 fprintf(f,"\n GRED received message smaller than expected\n");
292 /* Bad hack! should really return a proper message as shown above*/
294 for (i=0;i<MAX_DPs;i++, qopt++) {
295 if (qopt->DP >= MAX_DPs) continue;
296 fprintf(f, "\n DP:%d (prio %d) Average Queue %s Measured "
300 sprint_size(qopt->qave, b4),
301 sprint_size(qopt->backlog, b5));
302 fprintf(f, "\n\t Packet drops: %d (forced %d early %d) ",
303 qopt->forced+qopt->early,
306 fprintf(f, "\n\t Packet totals: %u (bytes %u) ",
310 fprintf(f, "\n limit %s min %s max %s ",
311 sprint_size(qopt->limit, b1),
312 sprint_size(qopt->qth_min, b2),
313 sprint_size(qopt->qth_max, b3));
314 fprintf(f, "ewma %u ", qopt->Wlog);
316 fprintf(f, "probability %lg ", max_p[i] / pow(2, 32));
318 fprintf(f, "Plog %u ", qopt->Plog);
319 fprintf(f, "Scell_log %u", qopt->Scell_log);
324 struct qdisc_util gred_qdisc_util = {
326 .parse_qopt = gred_parse_opt,
327 .print_qopt = gred_print_opt,