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aba5acdf SH |
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 <syslog.h> | |
17 | #include <fcntl.h> | |
18 | #include <sys/socket.h> | |
19 | #include <netinet/in.h> | |
20 | #include <arpa/inet.h> | |
21 | #include <string.h> | |
22 | ||
23 | #include "utils.h" | |
24 | #include "tc_util.h" | |
25 | ||
26 | #include "tc_red.h" | |
27 | ||
28 | static void explain(void) | |
29 | { | |
841fc7bc ED |
30 | fprintf(stderr, "Usage: ... red limit BYTES [min BYTES] [max BYTES] avpkt BYTES [burst PACKETS]\n"); |
31 | fprintf(stderr, " [probability PROBABILITY] bandwidth KBPS [ecn] [harddrop]\n"); | |
aba5acdf SH |
32 | } |
33 | ||
aba5acdf SH |
34 | static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) |
35 | { | |
aba5acdf SH |
36 | struct tc_red_qopt opt; |
37 | unsigned burst = 0; | |
38 | unsigned avpkt = 0; | |
39 | double probability = 0.02; | |
40 | unsigned rate = 0; | |
aba5acdf SH |
41 | int wlog; |
42 | __u8 sbuf[256]; | |
43 | struct rtattr *tail; | |
44 | ||
45 | memset(&opt, 0, sizeof(opt)); | |
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 | } | |
aba5acdf SH |
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 | } | |
aba5acdf SH |
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 | } | |
aba5acdf SH |
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 | } | |
aba5acdf SH |
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 | } | |
aba5acdf SH |
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 | } | |
aba5acdf SH |
84 | } else if (strcmp(*argv, "bandwidth") == 0) { |
85 | NEXT_ARG(); | |
86 | if (get_rate(&rate, *argv)) { | |
87 | fprintf(stderr, "Illegal \"bandwidth\"\n"); | |
88 | return -1; | |
89 | } | |
aba5acdf | 90 | } else if (strcmp(*argv, "ecn") == 0) { |
841fc7bc ED |
91 | opt.flags |= TC_RED_ECN; |
92 | } else if (strcmp(*argv, "harddrop") == 0) { | |
93 | opt.flags |= TC_RED_HARDDROP; | |
aba5acdf SH |
94 | } else if (strcmp(*argv, "help") == 0) { |
95 | explain(); | |
96 | return -1; | |
97 | } else { | |
98 | fprintf(stderr, "What is \"%s\"?\n", *argv); | |
99 | explain(); | |
100 | return -1; | |
101 | } | |
102 | argc--; argv++; | |
103 | } | |
104 | ||
aba5acdf SH |
105 | if (rate == 0) |
106 | get_rate(&rate, "10Mbit"); | |
107 | ||
841fc7bc ED |
108 | if (!opt.limit || !avpkt) { |
109 | fprintf(stderr, "RED: Required parameter (limit, avpkt) is missing\n"); | |
aba5acdf SH |
110 | return -1; |
111 | } | |
841fc7bc ED |
112 | /* Compute default min/max thresholds based on |
113 | * Sally Floyd's recommendations: | |
114 | * http://www.icir.org/floyd/REDparameters.txt | |
115 | */ | |
116 | if (!opt.qth_max) | |
117 | opt.qth_max = opt.qth_min ? opt.qth_min * 3 : opt.limit / 4; | |
118 | if (!opt.qth_min) | |
119 | opt.qth_min = opt.qth_max / 3; | |
120 | if (!burst) | |
ab15aeac | 121 | burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt); |
aba5acdf SH |
122 | if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) { |
123 | fprintf(stderr, "RED: failed to calculate EWMA constant.\n"); | |
124 | return -1; | |
125 | } | |
126 | if (wlog >= 10) | |
ab15aeac | 127 | fprintf(stderr, "RED: WARNING. Burst %d seems to be too large.\n", burst); |
aba5acdf SH |
128 | opt.Wlog = wlog; |
129 | if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) { | |
130 | fprintf(stderr, "RED: failed to calculate probability.\n"); | |
131 | return -1; | |
132 | } | |
133 | opt.Plog = wlog; | |
134 | if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0) { | |
135 | fprintf(stderr, "RED: failed to calculate idle damping table.\n"); | |
136 | return -1; | |
137 | } | |
138 | opt.Scell_log = wlog; | |
aba5acdf | 139 | |
228569c3 | 140 | tail = NLMSG_TAIL(n); |
aba5acdf SH |
141 | addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); |
142 | addattr_l(n, 1024, TCA_RED_PARMS, &opt, sizeof(opt)); | |
143 | addattr_l(n, 1024, TCA_RED_STAB, sbuf, 256); | |
228569c3 | 144 | tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; |
aba5acdf SH |
145 | return 0; |
146 | } | |
147 | ||
148 | static int red_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) | |
149 | { | |
841fc7bc | 150 | struct rtattr *tb[TCA_RED_MAX + 1]; |
aba5acdf SH |
151 | struct tc_red_qopt *qopt; |
152 | SPRINT_BUF(b1); | |
153 | SPRINT_BUF(b2); | |
154 | SPRINT_BUF(b3); | |
155 | ||
156 | if (opt == NULL) | |
157 | return 0; | |
158 | ||
841fc7bc | 159 | parse_rtattr_nested(tb, TCA_RED_MAX, opt); |
aba5acdf SH |
160 | |
161 | if (tb[TCA_RED_PARMS] == NULL) | |
162 | return -1; | |
163 | qopt = RTA_DATA(tb[TCA_RED_PARMS]); | |
164 | if (RTA_PAYLOAD(tb[TCA_RED_PARMS]) < sizeof(*qopt)) | |
165 | return -1; | |
166 | fprintf(f, "limit %s min %s max %s ", | |
167 | sprint_size(qopt->limit, b1), | |
168 | sprint_size(qopt->qth_min, b2), | |
169 | sprint_size(qopt->qth_max, b3)); | |
aba5acdf SH |
170 | if (qopt->flags & TC_RED_ECN) |
171 | fprintf(f, "ecn "); | |
841fc7bc ED |
172 | if (qopt->flags & TC_RED_HARDDROP) |
173 | fprintf(f, "harddrop "); | |
aba5acdf SH |
174 | if (show_details) { |
175 | fprintf(f, "ewma %u Plog %u Scell_log %u", | |
176 | qopt->Wlog, qopt->Plog, qopt->Scell_log); | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats) | |
182 | { | |
183 | #ifdef TC_RED_ECN | |
184 | struct tc_red_xstats *st; | |
185 | ||
186 | if (xstats == NULL) | |
187 | return 0; | |
188 | ||
189 | if (RTA_PAYLOAD(xstats) < sizeof(*st)) | |
190 | return -1; | |
191 | ||
192 | st = RTA_DATA(xstats); | |
193 | fprintf(f, " marked %u early %u pdrop %u other %u", | |
194 | st->marked, st->early, st->pdrop, st->other); | |
195 | return 0; | |
ae665a52 | 196 | |
aba5acdf SH |
197 | #endif |
198 | return 0; | |
199 | } | |
200 | ||
201 | ||
95812b56 | 202 | struct qdisc_util red_qdisc_util = { |
f2f99e2e SH |
203 | .id = "red", |
204 | .parse_qopt = red_parse_opt, | |
205 | .print_qopt = red_print_opt, | |
206 | .print_xstats = red_print_xstats, | |
aba5acdf | 207 | }; |