| /* |
| * q_red.c RED. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <syslog.h> |
| #include <fcntl.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <string.h> |
| #include <math.h> |
| |
| #include "utils.h" |
| #include "tc_util.h" |
| |
| #include "tc_red.h" |
| |
| static void explain(void) |
| { |
| fprintf(stderr, "Usage: ... red limit BYTES [min BYTES] [max BYTES] avpkt BYTES [burst PACKETS]\n"); |
| fprintf(stderr, " [adaptive] [probability PROBABILITY] [bandwidth KBPS]\n"); |
| fprintf(stderr, " [ecn] [harddrop]\n"); |
| } |
| |
| static int red_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n) |
| { |
| struct tc_red_qopt opt; |
| unsigned burst = 0; |
| unsigned avpkt = 0; |
| double probability = 0.02; |
| unsigned rate = 0; |
| int parm; |
| __u8 sbuf[256]; |
| __u32 max_P; |
| struct rtattr *tail; |
| |
| memset(&opt, 0, sizeof(opt)); |
| |
| while (argc > 0) { |
| if (strcmp(*argv, "limit") == 0) { |
| NEXT_ARG(); |
| if (get_size(&opt.limit, *argv)) { |
| fprintf(stderr, "Illegal \"limit\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "min") == 0) { |
| NEXT_ARG(); |
| if (get_size(&opt.qth_min, *argv)) { |
| fprintf(stderr, "Illegal \"min\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "max") == 0) { |
| NEXT_ARG(); |
| if (get_size(&opt.qth_max, *argv)) { |
| fprintf(stderr, "Illegal \"max\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "burst") == 0) { |
| NEXT_ARG(); |
| if (get_unsigned(&burst, *argv, 0)) { |
| fprintf(stderr, "Illegal \"burst\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "avpkt") == 0) { |
| NEXT_ARG(); |
| if (get_size(&avpkt, *argv)) { |
| fprintf(stderr, "Illegal \"avpkt\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "probability") == 0) { |
| NEXT_ARG(); |
| if (sscanf(*argv, "%lg", &probability) != 1) { |
| fprintf(stderr, "Illegal \"probability\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "bandwidth") == 0) { |
| NEXT_ARG(); |
| if (get_rate(&rate, *argv)) { |
| fprintf(stderr, "Illegal \"bandwidth\"\n"); |
| return -1; |
| } |
| } else if (strcmp(*argv, "ecn") == 0) { |
| opt.flags |= TC_RED_ECN; |
| } else if (strcmp(*argv, "harddrop") == 0) { |
| opt.flags |= TC_RED_HARDDROP; |
| } else if (strcmp(*argv, "adaptative") == 0) { |
| opt.flags |= TC_RED_ADAPTATIVE; |
| } else if (strcmp(*argv, "adaptive") == 0) { |
| opt.flags |= TC_RED_ADAPTATIVE; |
| } else if (strcmp(*argv, "help") == 0) { |
| explain(); |
| return -1; |
| } else { |
| fprintf(stderr, "What is \"%s\"?\n", *argv); |
| explain(); |
| return -1; |
| } |
| argc--; argv++; |
| } |
| |
| if (!opt.limit || !avpkt) { |
| fprintf(stderr, "RED: Required parameter (limit, avpkt) is missing\n"); |
| return -1; |
| } |
| /* Compute default min/max thresholds based on |
| * Sally Floyd's recommendations: |
| * http://www.icir.org/floyd/REDparameters.txt |
| */ |
| if (!opt.qth_max) |
| opt.qth_max = opt.qth_min ? opt.qth_min * 3 : opt.limit / 4; |
| if (!opt.qth_min) |
| opt.qth_min = opt.qth_max / 3; |
| if (!burst) |
| burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt); |
| if (!rate) { |
| get_rate(&rate, "10Mbit"); |
| fprintf(stderr, "RED: set bandwidth to 10Mbit\n"); |
| } |
| if ((parm = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) { |
| fprintf(stderr, "RED: failed to calculate EWMA constant.\n"); |
| return -1; |
| } |
| if (parm >= 10) |
| fprintf(stderr, "RED: WARNING. Burst %u seems to be too large.\n", burst); |
| opt.Wlog = parm; |
| if ((parm = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) { |
| fprintf(stderr, "RED: failed to calculate probability.\n"); |
| return -1; |
| } |
| opt.Plog = parm; |
| if ((parm = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0) { |
| fprintf(stderr, "RED: failed to calculate idle damping table.\n"); |
| return -1; |
| } |
| opt.Scell_log = parm; |
| |
| tail = NLMSG_TAIL(n); |
| addattr_l(n, 1024, TCA_OPTIONS, NULL, 0); |
| addattr_l(n, 1024, TCA_RED_PARMS, &opt, sizeof(opt)); |
| addattr_l(n, 1024, TCA_RED_STAB, sbuf, 256); |
| max_P = probability * pow(2, 32); |
| addattr_l(n, 1024, TCA_RED_MAX_P, &max_P, sizeof(max_P)); |
| tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; |
| return 0; |
| } |
| |
| static int red_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt) |
| { |
| struct rtattr *tb[TCA_RED_MAX + 1]; |
| struct tc_red_qopt *qopt; |
| __u32 max_P = 0; |
| SPRINT_BUF(b1); |
| SPRINT_BUF(b2); |
| SPRINT_BUF(b3); |
| |
| if (opt == NULL) |
| return 0; |
| |
| parse_rtattr_nested(tb, TCA_RED_MAX, opt); |
| |
| if (tb[TCA_RED_PARMS] == NULL) |
| return -1; |
| qopt = RTA_DATA(tb[TCA_RED_PARMS]); |
| if (RTA_PAYLOAD(tb[TCA_RED_PARMS]) < sizeof(*qopt)) |
| return -1; |
| |
| if (tb[TCA_RED_MAX_P] && |
| RTA_PAYLOAD(tb[TCA_RED_MAX_P]) >= sizeof(__u32)) |
| max_P = rta_getattr_u32(tb[TCA_RED_MAX_P]); |
| |
| fprintf(f, "limit %s min %s max %s ", |
| sprint_size(qopt->limit, b1), |
| sprint_size(qopt->qth_min, b2), |
| sprint_size(qopt->qth_max, b3)); |
| if (qopt->flags & TC_RED_ECN) |
| fprintf(f, "ecn "); |
| if (qopt->flags & TC_RED_HARDDROP) |
| fprintf(f, "harddrop "); |
| if (qopt->flags & TC_RED_ADAPTATIVE) |
| fprintf(f, "adaptive "); |
| if (show_details) { |
| fprintf(f, "ewma %u ", qopt->Wlog); |
| if (max_P) |
| fprintf(f, "probability %lg ", max_P / pow(2, 32)); |
| else |
| fprintf(f, "Plog %u ", qopt->Plog); |
| fprintf(f, "Scell_log %u", qopt->Scell_log); |
| } |
| return 0; |
| } |
| |
| static int red_print_xstats(struct qdisc_util *qu, FILE *f, struct rtattr *xstats) |
| { |
| #ifdef TC_RED_ECN |
| struct tc_red_xstats *st; |
| |
| if (xstats == NULL) |
| return 0; |
| |
| if (RTA_PAYLOAD(xstats) < sizeof(*st)) |
| return -1; |
| |
| st = RTA_DATA(xstats); |
| fprintf(f, " marked %u early %u pdrop %u other %u", |
| st->marked, st->early, st->pdrop, st->other); |
| return 0; |
| |
| #endif |
| return 0; |
| } |
| |
| |
| struct qdisc_util red_qdisc_util = { |
| .id = "red", |
| .parse_qopt = red_parse_opt, |
| .print_qopt = red_print_opt, |
| .print_xstats = red_print_xstats, |
| }; |