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tc: B.W limits can now be specified in %.
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1 /*
2 * q_red.c RED.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16 #include <fcntl.h>
17 #include <sys/socket.h>
18 #include <netinet/in.h>
19 #include <arpa/inet.h>
20 #include <string.h>
21 #include <math.h>
22
23 #include "utils.h"
24 #include "tc_util.h"
25
26 #include "tc_red.h"
27
28 static void explain(void)
29 {
30 fprintf(stderr, "Usage: ... red limit BYTES [min BYTES] [max BYTES] avpkt BYTES [burst PACKETS]\n");
31 fprintf(stderr, " [adaptive] [probability PROBABILITY] [bandwidth KBPS]\n");
32 fprintf(stderr, " [ecn] [harddrop]\n");
33 }
34
35 static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n, const char *dev)
36 {
37 struct tc_red_qopt opt = {};
38 unsigned int burst = 0;
39 unsigned int avpkt = 0;
40 double probability = 0.02;
41 unsigned int rate = 0;
42 int parm;
43 __u8 sbuf[256];
44 __u32 max_P;
45 struct rtattr *tail;
46
47 while (argc > 0) {
48 if (strcmp(*argv, "limit") == 0) {
49 NEXT_ARG();
50 if (get_size(&opt.limit, *argv)) {
51 fprintf(stderr, "Illegal \"limit\"\n");
52 return -1;
53 }
54 } else if (strcmp(*argv, "min") == 0) {
55 NEXT_ARG();
56 if (get_size(&opt.qth_min, *argv)) {
57 fprintf(stderr, "Illegal \"min\"\n");
58 return -1;
59 }
60 } else if (strcmp(*argv, "max") == 0) {
61 NEXT_ARG();
62 if (get_size(&opt.qth_max, *argv)) {
63 fprintf(stderr, "Illegal \"max\"\n");
64 return -1;
65 }
66 } else if (strcmp(*argv, "burst") == 0) {
67 NEXT_ARG();
68 if (get_unsigned(&burst, *argv, 0)) {
69 fprintf(stderr, "Illegal \"burst\"\n");
70 return -1;
71 }
72 } else if (strcmp(*argv, "avpkt") == 0) {
73 NEXT_ARG();
74 if (get_size(&avpkt, *argv)) {
75 fprintf(stderr, "Illegal \"avpkt\"\n");
76 return -1;
77 }
78 } else if (strcmp(*argv, "probability") == 0) {
79 NEXT_ARG();
80 if (sscanf(*argv, "%lg", &probability) != 1) {
81 fprintf(stderr, "Illegal \"probability\"\n");
82 return -1;
83 }
84 } else if (strcmp(*argv, "bandwidth") == 0) {
85 NEXT_ARG();
86 if (strchr(*argv, '%')) {
87 if (get_percent_rate(&rate, *argv, dev)) {
88 fprintf(stderr, "Illegal \"bandwidth\"\n");
89 return -1;
90 }
91 } else if (get_rate(&rate, *argv)) {
92 fprintf(stderr, "Illegal \"bandwidth\"\n");
93 return -1;
94 }
95 } else if (strcmp(*argv, "ecn") == 0) {
96 opt.flags |= TC_RED_ECN;
97 } else if (strcmp(*argv, "harddrop") == 0) {
98 opt.flags |= TC_RED_HARDDROP;
99 } else if (strcmp(*argv, "adaptative") == 0) {
100 opt.flags |= TC_RED_ADAPTATIVE;
101 } else if (strcmp(*argv, "adaptive") == 0) {
102 opt.flags |= TC_RED_ADAPTATIVE;
103 } else if (strcmp(*argv, "help") == 0) {
104 explain();
105 return -1;
106 } else {
107 fprintf(stderr, "What is \"%s\"?\n", *argv);
108 explain();
109 return -1;
110 }
111 argc--; argv++;
112 }
113
114 if (!opt.limit || !avpkt) {
115 fprintf(stderr, "RED: Required parameter (limit, avpkt) is missing\n");
116 return -1;
117 }
118 /* Compute default min/max thresholds based on
119 * Sally Floyd's recommendations:
120 * http://www.icir.org/floyd/REDparameters.txt
121 */
122 if (!opt.qth_max)
123 opt.qth_max = opt.qth_min ? opt.qth_min * 3 : opt.limit / 4;
124 if (!opt.qth_min)
125 opt.qth_min = opt.qth_max / 3;
126 if (!burst)
127 burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
128 if (!rate) {
129 get_rate(&rate, "10Mbit");
130 fprintf(stderr, "RED: set bandwidth to 10Mbit\n");
131 }
132 if ((parm = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
133 fprintf(stderr, "RED: failed to calculate EWMA constant.\n");
134 return -1;
135 }
136 if (parm >= 10)
137 fprintf(stderr, "RED: WARNING. Burst %u seems to be too large.\n", burst);
138 opt.Wlog = parm;
139 if ((parm = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
140 fprintf(stderr, "RED: failed to calculate probability.\n");
141 return -1;
142 }
143 opt.Plog = parm;
144 if ((parm = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0) {
145 fprintf(stderr, "RED: failed to calculate idle damping table.\n");
146 return -1;
147 }
148 opt.Scell_log = parm;
149
150 tail = NLMSG_TAIL(n);
151 addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
152 addattr_l(n, 1024, TCA_RED_PARMS, &opt, sizeof(opt));
153 addattr_l(n, 1024, TCA_RED_STAB, sbuf, 256);
154 max_P = probability * pow(2, 32);
155 addattr_l(n, 1024, TCA_RED_MAX_P, &max_P, sizeof(max_P));
156 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
157 return 0;
158 }
159
160 static int red_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
161 {
162 struct rtattr *tb[TCA_RED_MAX + 1];
163 struct tc_red_qopt *qopt;
164 __u32 max_P = 0;
165
166 SPRINT_BUF(b1);
167 SPRINT_BUF(b2);
168 SPRINT_BUF(b3);
169
170 if (opt == NULL)
171 return 0;
172
173 parse_rtattr_nested(tb, TCA_RED_MAX, opt);
174
175 if (tb[TCA_RED_PARMS] == NULL)
176 return -1;
177 qopt = RTA_DATA(tb[TCA_RED_PARMS]);
178 if (RTA_PAYLOAD(tb[TCA_RED_PARMS]) < sizeof(*qopt))
179 return -1;
180
181 if (tb[TCA_RED_MAX_P] &&
182 RTA_PAYLOAD(tb[TCA_RED_MAX_P]) >= sizeof(__u32))
183 max_P = rta_getattr_u32(tb[TCA_RED_MAX_P]);
184
185 fprintf(f, "limit %s min %s max %s ",
186 sprint_size(qopt->limit, b1),
187 sprint_size(qopt->qth_min, b2),
188 sprint_size(qopt->qth_max, b3));
189 if (qopt->flags & TC_RED_ECN)
190 fprintf(f, "ecn ");
191 if (qopt->flags & TC_RED_HARDDROP)
192 fprintf(f, "harddrop ");
193 if (qopt->flags & TC_RED_ADAPTATIVE)
194 fprintf(f, "adaptive ");
195 if (show_details) {
196 fprintf(f, "ewma %u ", qopt->Wlog);
197 if (max_P)
198 fprintf(f, "probability %lg ", max_P / pow(2, 32));
199 else
200 fprintf(f, "Plog %u ", qopt->Plog);
201 fprintf(f, "Scell_log %u", qopt->Scell_log);
202 }
203 return 0;
204 }
205
206 static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats)
207 {
208 #ifdef TC_RED_ECN
209 struct tc_red_xstats *st;
210
211 if (xstats == NULL)
212 return 0;
213
214 if (RTA_PAYLOAD(xstats) < sizeof(*st))
215 return -1;
216
217 st = RTA_DATA(xstats);
218 fprintf(f, " marked %u early %u pdrop %u other %u",
219 st->marked, st->early, st->pdrop, st->other);
220 return 0;
221
222 #endif
223 return 0;
224 }
225
226
227 struct qdisc_util red_qdisc_util = {
228 .id = "red",
229 .parse_qopt = red_parse_opt,
230 .print_qopt = red_print_opt,
231 .print_xstats = red_print_xstats,
232 };