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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 | { | |
30 | fprintf(stderr, "Usage: ... red limit BYTES min BYTES max BYTES avpkt BYTES burst PACKETS\n"); | |
31 | fprintf(stderr, " probability PROBABILITY bandwidth KBPS [ ecn ]\n"); | |
32 | } | |
33 | ||
34 | #define usage() return(-1) | |
35 | ||
36 | static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) | |
37 | { | |
38 | int ok=0; | |
39 | struct tc_red_qopt opt; | |
40 | unsigned burst = 0; | |
41 | unsigned avpkt = 0; | |
42 | double probability = 0.02; | |
43 | unsigned rate = 0; | |
44 | int ecn_ok = 0; | |
45 | int wlog; | |
46 | __u8 sbuf[256]; | |
47 | struct rtattr *tail; | |
48 | ||
49 | memset(&opt, 0, sizeof(opt)); | |
50 | ||
51 | while (argc > 0) { | |
52 | if (strcmp(*argv, "limit") == 0) { | |
53 | NEXT_ARG(); | |
54 | if (get_size(&opt.limit, *argv)) { | |
55 | fprintf(stderr, "Illegal \"limit\"\n"); | |
56 | return -1; | |
57 | } | |
58 | ok++; | |
59 | } else if (strcmp(*argv, "min") == 0) { | |
60 | NEXT_ARG(); | |
61 | if (get_size(&opt.qth_min, *argv)) { | |
62 | fprintf(stderr, "Illegal \"min\"\n"); | |
63 | return -1; | |
64 | } | |
65 | ok++; | |
66 | } else if (strcmp(*argv, "max") == 0) { | |
67 | NEXT_ARG(); | |
68 | if (get_size(&opt.qth_max, *argv)) { | |
69 | fprintf(stderr, "Illegal \"max\"\n"); | |
70 | return -1; | |
71 | } | |
72 | ok++; | |
73 | } else if (strcmp(*argv, "burst") == 0) { | |
74 | NEXT_ARG(); | |
75 | if (get_unsigned(&burst, *argv, 0)) { | |
76 | fprintf(stderr, "Illegal \"burst\"\n"); | |
77 | return -1; | |
78 | } | |
79 | ok++; | |
80 | } else if (strcmp(*argv, "avpkt") == 0) { | |
81 | NEXT_ARG(); | |
82 | if (get_size(&avpkt, *argv)) { | |
83 | fprintf(stderr, "Illegal \"avpkt\"\n"); | |
84 | return -1; | |
85 | } | |
86 | ok++; | |
87 | } else if (strcmp(*argv, "probability") == 0) { | |
88 | NEXT_ARG(); | |
89 | if (sscanf(*argv, "%lg", &probability) != 1) { | |
90 | fprintf(stderr, "Illegal \"probability\"\n"); | |
91 | return -1; | |
92 | } | |
93 | ok++; | |
94 | } else if (strcmp(*argv, "bandwidth") == 0) { | |
95 | NEXT_ARG(); | |
96 | if (get_rate(&rate, *argv)) { | |
97 | fprintf(stderr, "Illegal \"bandwidth\"\n"); | |
98 | return -1; | |
99 | } | |
100 | ok++; | |
101 | } else if (strcmp(*argv, "ecn") == 0) { | |
102 | ecn_ok = 1; | |
103 | ok++; | |
104 | } else if (strcmp(*argv, "help") == 0) { | |
105 | explain(); | |
106 | return -1; | |
107 | } else { | |
108 | fprintf(stderr, "What is \"%s\"?\n", *argv); | |
109 | explain(); | |
110 | return -1; | |
111 | } | |
112 | argc--; argv++; | |
113 | } | |
114 | ||
115 | if (!ok) | |
116 | return 0; | |
117 | ||
118 | if (rate == 0) | |
119 | get_rate(&rate, "10Mbit"); | |
120 | ||
121 | if (!opt.qth_min || !opt.qth_max || !burst || !opt.limit || !avpkt) { | |
122 | fprintf(stderr, "Required parameter (min, max, burst, limit, avpket) is missing\n"); | |
123 | return -1; | |
124 | } | |
125 | ||
126 | if ((wlog = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) { | |
127 | fprintf(stderr, "RED: failed to calculate EWMA constant.\n"); | |
128 | return -1; | |
129 | } | |
130 | if (wlog >= 10) | |
131 | fprintf(stderr, "RED: WARNING. Burst %d seems to be to large.\n", burst); | |
132 | opt.Wlog = wlog; | |
133 | if ((wlog = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) { | |
134 | fprintf(stderr, "RED: failed to calculate probability.\n"); | |
135 | return -1; | |
136 | } | |
137 | opt.Plog = wlog; | |
138 | if ((wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0) { | |
139 | fprintf(stderr, "RED: failed to calculate idle damping table.\n"); | |
140 | return -1; | |
141 | } | |
142 | opt.Scell_log = wlog; | |
143 | if (ecn_ok) { | |
144 | #ifdef TC_RED_ECN | |
145 | opt.flags |= TC_RED_ECN; | |
146 | #else | |
147 | fprintf(stderr, "RED: ECN support is missing in this binary.\n"); | |
148 | return -1; | |
149 | #endif | |
150 | } | |
151 | ||
228569c3 | 152 | tail = NLMSG_TAIL(n); |
aba5acdf SH |
153 | addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); |
154 | addattr_l(n, 1024, TCA_RED_PARMS, &opt, sizeof(opt)); | |
155 | addattr_l(n, 1024, TCA_RED_STAB, sbuf, 256); | |
228569c3 | 156 | tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; |
aba5acdf SH |
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_STAB+1]; | |
163 | struct tc_red_qopt *qopt; | |
164 | SPRINT_BUF(b1); | |
165 | SPRINT_BUF(b2); | |
166 | SPRINT_BUF(b3); | |
167 | ||
168 | if (opt == NULL) | |
169 | return 0; | |
170 | ||
3b3ecd31 | 171 | parse_rtattr_nested(tb, TCA_RED_STAB, opt); |
aba5acdf SH |
172 | |
173 | if (tb[TCA_RED_PARMS] == NULL) | |
174 | return -1; | |
175 | qopt = RTA_DATA(tb[TCA_RED_PARMS]); | |
176 | if (RTA_PAYLOAD(tb[TCA_RED_PARMS]) < sizeof(*qopt)) | |
177 | return -1; | |
178 | fprintf(f, "limit %s min %s max %s ", | |
179 | sprint_size(qopt->limit, b1), | |
180 | sprint_size(qopt->qth_min, b2), | |
181 | sprint_size(qopt->qth_max, b3)); | |
182 | #ifdef TC_RED_ECN | |
183 | if (qopt->flags & TC_RED_ECN) | |
184 | fprintf(f, "ecn "); | |
185 | #endif | |
186 | if (show_details) { | |
187 | fprintf(f, "ewma %u Plog %u Scell_log %u", | |
188 | qopt->Wlog, qopt->Plog, qopt->Scell_log); | |
189 | } | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats) | |
194 | { | |
195 | #ifdef TC_RED_ECN | |
196 | struct tc_red_xstats *st; | |
197 | ||
198 | if (xstats == NULL) | |
199 | return 0; | |
200 | ||
201 | if (RTA_PAYLOAD(xstats) < sizeof(*st)) | |
202 | return -1; | |
203 | ||
204 | st = RTA_DATA(xstats); | |
205 | fprintf(f, " marked %u early %u pdrop %u other %u", | |
206 | st->marked, st->early, st->pdrop, st->other); | |
207 | return 0; | |
ae665a52 | 208 | |
aba5acdf SH |
209 | #endif |
210 | return 0; | |
211 | } | |
212 | ||
213 | ||
95812b56 | 214 | struct qdisc_util red_qdisc_util = { |
f2f99e2e SH |
215 | .id = "red", |
216 | .parse_qopt = red_parse_opt, | |
217 | .print_qopt = red_print_opt, | |
218 | .print_xstats = red_print_xstats, | |
aba5acdf | 219 | }; |