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a4eca97c SH |
1 | /* |
2 | * q_choke.c CHOKE. | |
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: Stephen Hemminger <shemminger@vyatta.com> | |
10 | */ | |
11 | ||
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <unistd.h> | |
a4eca97c SH |
15 | #include <fcntl.h> |
16 | #include <sys/socket.h> | |
17 | #include <netinet/in.h> | |
18 | #include <arpa/inet.h> | |
19 | #include <string.h> | |
650252d8 | 20 | #include <math.h> |
a4eca97c SH |
21 | |
22 | #include "utils.h" | |
23 | #include "tc_util.h" | |
24 | ||
25 | #include "tc_red.h" | |
26 | ||
27 | static void explain(void) | |
28 | { | |
29 | fprintf(stderr, "Usage: ... choke limit PACKETS bandwidth KBPS [ecn]\n"); | |
30 | fprintf(stderr, " [ min PACKETS ] [ max PACKETS ] [ burst PACKETS ]\n"); | |
31 | } | |
32 | ||
33 | static int choke_parse_opt(struct qdisc_util *qu, int argc, char **argv, | |
927e3cfb | 34 | struct nlmsghdr *n, const char *dev) |
a4eca97c | 35 | { |
d17b136f | 36 | struct tc_red_qopt opt = {}; |
32a121cb SH |
37 | unsigned int burst = 0; |
38 | unsigned int avpkt = 1000; | |
a4eca97c | 39 | double probability = 0.02; |
32a121cb | 40 | unsigned int rate = 0; |
a4eca97c SH |
41 | int ecn_ok = 0; |
42 | int wlog; | |
43 | __u8 sbuf[256]; | |
650252d8 | 44 | __u32 max_P; |
a4eca97c SH |
45 | struct rtattr *tail; |
46 | ||
a4eca97c SH |
47 | while (argc > 0) { |
48 | if (strcmp(*argv, "limit") == 0) { | |
49 | NEXT_ARG(); | |
50 | if (get_unsigned(&opt.limit, *argv, 0)) { | |
51 | fprintf(stderr, "Illegal \"limit\"\n"); | |
52 | return -1; | |
53 | } | |
54 | } else if (strcmp(*argv, "bandwidth") == 0) { | |
55 | NEXT_ARG(); | |
927e3cfb ND |
56 | if (strchr(*argv, '%')) { |
57 | if (get_percent_rate(&rate, *argv, dev)) { | |
58 | fprintf(stderr, "Illegal \"bandwidth\"\n"); | |
59 | return -1; | |
60 | } | |
61 | } else if (get_rate(&rate, *argv)) { | |
a4eca97c SH |
62 | fprintf(stderr, "Illegal \"bandwidth\"\n"); |
63 | return -1; | |
64 | } | |
65 | } else if (strcmp(*argv, "ecn") == 0) { | |
66 | ecn_ok = 1; | |
67 | } else if (strcmp(*argv, "min") == 0) { | |
68 | NEXT_ARG(); | |
69 | if (get_unsigned(&opt.qth_min, *argv, 0)) { | |
70 | fprintf(stderr, "Illegal \"min\"\n"); | |
71 | return -1; | |
72 | } | |
73 | } else if (strcmp(*argv, "max") == 0) { | |
74 | NEXT_ARG(); | |
75 | if (get_unsigned(&opt.qth_max, *argv, 0)) { | |
76 | fprintf(stderr, "Illegal \"max\"\n"); | |
77 | return -1; | |
78 | } | |
79 | } else if (strcmp(*argv, "burst") == 0) { | |
80 | NEXT_ARG(); | |
81 | if (get_unsigned(&burst, *argv, 0)) { | |
82 | fprintf(stderr, "Illegal \"burst\"\n"); | |
83 | return -1; | |
84 | } | |
85 | } else if (strcmp(*argv, "avpkt") == 0) { | |
86 | NEXT_ARG(); | |
87 | if (get_size(&avpkt, *argv)) { | |
88 | fprintf(stderr, "Illegal \"avpkt\"\n"); | |
89 | return -1; | |
90 | } | |
91 | } else if (strcmp(*argv, "probability") == 0) { | |
92 | NEXT_ARG(); | |
93 | if (sscanf(*argv, "%lg", &probability) != 1) { | |
94 | fprintf(stderr, "Illegal \"probability\"\n"); | |
95 | return -1; | |
96 | } | |
97 | } else if (strcmp(*argv, "help") == 0) { | |
98 | explain(); | |
99 | return -1; | |
100 | } else { | |
101 | fprintf(stderr, "What is \"%s\"?\n", *argv); | |
102 | explain(); | |
103 | return -1; | |
104 | } | |
105 | argc--; argv++; | |
106 | } | |
107 | ||
108 | if (!rate || !opt.limit) { | |
109 | fprintf(stderr, "Required parameter (bandwidth, limit) is missing\n"); | |
110 | return -1; | |
111 | } | |
112 | ||
3d0b7439 | 113 | /* Compute default min/max thresholds based on |
a4eca97c SH |
114 | Sally Floyd's recommendations: |
115 | http://www.icir.org/floyd/REDparameters.txt | |
116 | */ | |
3d0b7439 | 117 | if (!opt.qth_max) |
a4eca97c SH |
118 | opt.qth_max = opt.limit / 4; |
119 | if (!opt.qth_min) | |
120 | opt.qth_min = opt.qth_max / 3; | |
121 | if (!burst) | |
122 | burst = (2 * opt.qth_min + opt.qth_max) / 3; | |
123 | ||
124 | if (opt.qth_max > opt.limit) { | |
125 | fprintf(stderr, "\"max\" is larger than \"limit\"\n"); | |
126 | return -1; | |
127 | } | |
128 | ||
9f1ba570 | 129 | if (opt.qth_min >= opt.qth_max) { |
a4eca97c SH |
130 | fprintf(stderr, "\"min\" is not smaller than \"max\"\n"); |
131 | return -1; | |
132 | } | |
133 | ||
134 | wlog = tc_red_eval_ewma(opt.qth_min*avpkt, burst, avpkt); | |
135 | if (wlog < 0) { | |
136 | fprintf(stderr, "CHOKE: failed to calculate EWMA constant.\n"); | |
137 | return -1; | |
138 | } | |
139 | if (wlog >= 10) | |
ab15aeac | 140 | fprintf(stderr, "CHOKE: WARNING. Burst %d seems to be too large.\n", burst); |
a4eca97c SH |
141 | opt.Wlog = wlog; |
142 | ||
143 | wlog = tc_red_eval_P(opt.qth_min*avpkt, opt.qth_max*avpkt, probability); | |
144 | if (wlog < 0) { | |
145 | fprintf(stderr, "CHOKE: failed to calculate probability.\n"); | |
146 | return -1; | |
147 | } | |
148 | opt.Plog = wlog; | |
149 | ||
150 | wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf); | |
151 | if (wlog < 0) { | |
152 | fprintf(stderr, "CHOKE: failed to calculate idle damping table.\n"); | |
153 | return -1; | |
154 | } | |
155 | opt.Scell_log = wlog; | |
156 | if (ecn_ok) | |
157 | opt.flags |= TC_RED_ECN; | |
158 | ||
159 | tail = NLMSG_TAIL(n); | |
160 | addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); | |
161 | addattr_l(n, 1024, TCA_CHOKE_PARMS, &opt, sizeof(opt)); | |
162 | addattr_l(n, 1024, TCA_CHOKE_STAB, sbuf, 256); | |
650252d8 ED |
163 | max_P = probability * pow(2, 32); |
164 | addattr_l(n, 1024, TCA_CHOKE_MAX_P, &max_P, sizeof(max_P)); | |
a4eca97c SH |
165 | tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int choke_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) | |
170 | { | |
650252d8 | 171 | struct rtattr *tb[TCA_CHOKE_MAX+1]; |
a4eca97c | 172 | const struct tc_red_qopt *qopt; |
650252d8 | 173 | __u32 max_P = 0; |
a4eca97c SH |
174 | |
175 | if (opt == NULL) | |
176 | return 0; | |
177 | ||
650252d8 | 178 | parse_rtattr_nested(tb, TCA_CHOKE_MAX, opt); |
a4eca97c SH |
179 | |
180 | if (tb[TCA_CHOKE_PARMS] == NULL) | |
181 | return -1; | |
182 | qopt = RTA_DATA(tb[TCA_CHOKE_PARMS]); | |
183 | if (RTA_PAYLOAD(tb[TCA_CHOKE_PARMS]) < sizeof(*qopt)) | |
184 | return -1; | |
650252d8 ED |
185 | if (tb[TCA_CHOKE_MAX_P] && |
186 | RTA_PAYLOAD(tb[TCA_CHOKE_MAX_P]) >= sizeof(__u32)) | |
ff24746c | 187 | max_P = rta_getattr_u32(tb[TCA_CHOKE_MAX_P]); |
a4eca97c SH |
188 | |
189 | fprintf(f, "limit %up min %up max %up ", | |
190 | qopt->limit, qopt->qth_min, qopt->qth_max); | |
191 | ||
192 | if (qopt->flags & TC_RED_ECN) | |
193 | fprintf(f, "ecn "); | |
194 | ||
195 | if (show_details) { | |
650252d8 ED |
196 | fprintf(f, "ewma %u ", qopt->Wlog); |
197 | if (max_P) | |
198 | fprintf(f, "probability %g ", max_P / pow(2, 32)); | |
199 | else | |
200 | fprintf(f, "Plog %u ", qopt->Plog); | |
201 | fprintf(f, "Scell_log %u", qopt->Scell_log); | |
a4eca97c SH |
202 | } |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int choke_print_xstats(struct qdisc_util *qu, FILE *f, | |
207 | struct rtattr *xstats) | |
208 | { | |
209 | struct tc_choke_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 matched %u", | |
219 | st->marked, st->early, st->pdrop, st->other, st->matched); | |
220 | return 0; | |
221 | ||
222 | } | |
223 | ||
224 | struct qdisc_util choke_qdisc_util = { | |
225 | .id = "choke", | |
226 | .parse_qopt = choke_parse_opt, | |
227 | .print_qopt = choke_print_opt, | |
228 | .print_xstats = choke_print_xstats, | |
229 | }; |