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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
28 static void explain(void)
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");
34 static int red_parse_opt(struct qdisc_util
*qu
, int argc
, char **argv
, struct nlmsghdr
*n
)
36 struct tc_red_qopt opt
;
39 double probability
= 0.02;
45 memset(&opt
, 0, sizeof(opt
));
48 if (strcmp(*argv
, "limit") == 0) {
50 if (get_size(&opt
.limit
, *argv
)) {
51 fprintf(stderr
, "Illegal \"limit\"\n");
54 } else if (strcmp(*argv
, "min") == 0) {
56 if (get_size(&opt
.qth_min
, *argv
)) {
57 fprintf(stderr
, "Illegal \"min\"\n");
60 } else if (strcmp(*argv
, "max") == 0) {
62 if (get_size(&opt
.qth_max
, *argv
)) {
63 fprintf(stderr
, "Illegal \"max\"\n");
66 } else if (strcmp(*argv
, "burst") == 0) {
68 if (get_unsigned(&burst
, *argv
, 0)) {
69 fprintf(stderr
, "Illegal \"burst\"\n");
72 } else if (strcmp(*argv
, "avpkt") == 0) {
74 if (get_size(&avpkt
, *argv
)) {
75 fprintf(stderr
, "Illegal \"avpkt\"\n");
78 } else if (strcmp(*argv
, "probability") == 0) {
80 if (sscanf(*argv
, "%lg", &probability
) != 1) {
81 fprintf(stderr
, "Illegal \"probability\"\n");
84 } else if (strcmp(*argv
, "bandwidth") == 0) {
86 if (get_rate(&rate
, *argv
)) {
87 fprintf(stderr
, "Illegal \"bandwidth\"\n");
90 } else if (strcmp(*argv
, "ecn") == 0) {
91 opt
.flags
|= TC_RED_ECN
;
92 } else if (strcmp(*argv
, "harddrop") == 0) {
93 opt
.flags
|= TC_RED_HARDDROP
;
94 } else if (strcmp(*argv
, "help") == 0) {
98 fprintf(stderr
, "What is \"%s\"?\n", *argv
);
106 get_rate(&rate
, "10Mbit");
108 if (!opt
.limit
|| !avpkt
) {
109 fprintf(stderr
, "RED: Required parameter (limit, avpkt) is missing\n");
112 /* Compute default min/max thresholds based on
113 * Sally Floyd's recommendations:
114 * http://www.icir.org/floyd/REDparameters.txt
117 opt
.qth_max
= opt
.qth_min
? opt
.qth_min
* 3 : opt
.limit
/ 4;
119 opt
.qth_min
= opt
.qth_max
/ 3;
121 burst
= (2 * opt
.qth_min
+ opt
.qth_max
) / (3 * avpkt
);
122 if ((wlog
= tc_red_eval_ewma(opt
.qth_min
, burst
, avpkt
)) < 0) {
123 fprintf(stderr
, "RED: failed to calculate EWMA constant.\n");
127 fprintf(stderr
, "RED: WARNING. Burst %d seems to be too large.\n", burst
);
129 if ((wlog
= tc_red_eval_P(opt
.qth_min
, opt
.qth_max
, probability
)) < 0) {
130 fprintf(stderr
, "RED: failed to calculate probability.\n");
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");
138 opt
.Scell_log
= wlog
;
140 tail
= NLMSG_TAIL(n
);
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);
144 tail
->rta_len
= (void *) NLMSG_TAIL(n
) - (void *) tail
;
148 static int red_print_opt(struct qdisc_util
*qu
, FILE *f
, struct rtattr
*opt
)
150 struct rtattr
*tb
[TCA_RED_MAX
+ 1];
151 struct tc_red_qopt
*qopt
;
159 parse_rtattr_nested(tb
, TCA_RED_MAX
, opt
);
161 if (tb
[TCA_RED_PARMS
] == NULL
)
163 qopt
= RTA_DATA(tb
[TCA_RED_PARMS
]);
164 if (RTA_PAYLOAD(tb
[TCA_RED_PARMS
]) < sizeof(*qopt
))
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
));
170 if (qopt
->flags
& TC_RED_ECN
)
172 if (qopt
->flags
& TC_RED_HARDDROP
)
173 fprintf(f
, "harddrop ");
175 fprintf(f
, "ewma %u Plog %u Scell_log %u",
176 qopt
->Wlog
, qopt
->Plog
, qopt
->Scell_log
);
181 static int red_print_xstats(struct qdisc_util
*qu
, FILE *f
, struct rtattr
*xstats
)
184 struct tc_red_xstats
*st
;
189 if (RTA_PAYLOAD(xstats
) < sizeof(*st
))
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
);
202 struct qdisc_util red_qdisc_util
= {
204 .parse_qopt
= red_parse_opt
,
205 .print_qopt
= red_print_opt
,
206 .print_xstats
= red_print_xstats
,