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/*
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* q_choke.c CHOKE.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Stephen Hemminger <shemminger@vyatta.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <string.h>
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#include <math.h>
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#include "utils.h"
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#include "tc_util.h"
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#include "tc_red.h"
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static void explain(void)
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{
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fprintf(stderr,
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"Usage: ... choke limit PACKETS bandwidth KBPS [ecn]\n"
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" [ min PACKETS ] [ max PACKETS ] [ burst PACKETS ]\n");
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}
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static int choke_parse_opt(struct qdisc_util *qu, int argc, char **argv,
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struct nlmsghdr *n, const char *dev)
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{
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struct tc_red_qopt opt = {};
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unsigned int burst = 0;
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unsigned int avpkt = 1000;
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double probability = 0.02;
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unsigned int rate = 0;
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int ecn_ok = 0;
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int wlog;
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__u8 sbuf[256];
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__u32 max_P;
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struct rtattr *tail;
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while (argc > 0) {
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if (strcmp(*argv, "limit") == 0) {
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NEXT_ARG();
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if (get_unsigned(&opt.limit, *argv, 0)) {
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fprintf(stderr, "Illegal \"limit\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "bandwidth") == 0) {
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NEXT_ARG();
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if (strchr(*argv, '%')) {
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if (get_percent_rate(&rate, *argv, dev)) {
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fprintf(stderr, "Illegal \"bandwidth\"\n");
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return -1;
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}
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} else if (get_rate(&rate, *argv)) {
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fprintf(stderr, "Illegal \"bandwidth\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "ecn") == 0) {
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ecn_ok = 1;
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} else if (strcmp(*argv, "min") == 0) {
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NEXT_ARG();
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if (get_unsigned(&opt.qth_min, *argv, 0)) {
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fprintf(stderr, "Illegal \"min\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "max") == 0) {
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NEXT_ARG();
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if (get_unsigned(&opt.qth_max, *argv, 0)) {
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fprintf(stderr, "Illegal \"max\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "burst") == 0) {
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NEXT_ARG();
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if (get_unsigned(&burst, *argv, 0)) {
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fprintf(stderr, "Illegal \"burst\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "avpkt") == 0) {
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NEXT_ARG();
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if (get_size(&avpkt, *argv)) {
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fprintf(stderr, "Illegal \"avpkt\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "probability") == 0) {
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NEXT_ARG();
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if (sscanf(*argv, "%lg", &probability) != 1) {
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fprintf(stderr, "Illegal \"probability\"\n");
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return -1;
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}
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} else if (strcmp(*argv, "help") == 0) {
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explain();
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return -1;
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} else {
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fprintf(stderr, "What is \"%s\"?\n", *argv);
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explain();
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return -1;
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}
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argc--; argv++;
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}
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if (!rate || !opt.limit) {
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fprintf(stderr, "Required parameter (bandwidth, limit) is missing\n");
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return -1;
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}
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/* Compute default min/max thresholds based on
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Sally Floyd's recommendations:
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http://www.icir.org/floyd/REDparameters.txt
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*/
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if (!opt.qth_max)
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opt.qth_max = opt.limit / 4;
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if (!opt.qth_min)
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opt.qth_min = opt.qth_max / 3;
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if (!burst)
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burst = (2 * opt.qth_min + opt.qth_max) / 3;
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if (opt.qth_max > opt.limit) {
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fprintf(stderr, "\"max\" is larger than \"limit\"\n");
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return -1;
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}
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if (opt.qth_min >= opt.qth_max) {
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fprintf(stderr, "\"min\" is not smaller than \"max\"\n");
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return -1;
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}
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wlog = tc_red_eval_ewma(opt.qth_min*avpkt, burst, avpkt);
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if (wlog < 0) {
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fprintf(stderr, "CHOKE: failed to calculate EWMA constant.\n");
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return -1;
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}
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if (wlog >= 10)
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fprintf(stderr, "CHOKE: WARNING. Burst %d seems to be too large.\n", burst);
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opt.Wlog = wlog;
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wlog = tc_red_eval_P(opt.qth_min*avpkt, opt.qth_max*avpkt, probability);
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if (wlog < 0) {
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fprintf(stderr, "CHOKE: failed to calculate probability.\n");
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return -1;
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}
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opt.Plog = wlog;
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wlog = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf);
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if (wlog < 0) {
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fprintf(stderr, "CHOKE: failed to calculate idle damping table.\n");
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return -1;
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}
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opt.Scell_log = wlog;
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if (ecn_ok)
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opt.flags |= TC_RED_ECN;
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tail = addattr_nest(n, 1024, TCA_OPTIONS);
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addattr_l(n, 1024, TCA_CHOKE_PARMS, &opt, sizeof(opt));
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addattr_l(n, 1024, TCA_CHOKE_STAB, sbuf, 256);
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max_P = probability * pow(2, 32);
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addattr_l(n, 1024, TCA_CHOKE_MAX_P, &max_P, sizeof(max_P));
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addattr_nest_end(n, tail);
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return 0;
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}
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static int choke_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct rtattr *tb[TCA_CHOKE_MAX+1];
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const struct tc_red_qopt *qopt;
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__u32 max_P = 0;
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if (opt == NULL)
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return 0;
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parse_rtattr_nested(tb, TCA_CHOKE_MAX, opt);
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if (tb[TCA_CHOKE_PARMS] == NULL)
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return -1;
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qopt = RTA_DATA(tb[TCA_CHOKE_PARMS]);
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if (RTA_PAYLOAD(tb[TCA_CHOKE_PARMS]) < sizeof(*qopt))
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return -1;
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if (tb[TCA_CHOKE_MAX_P] &&
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RTA_PAYLOAD(tb[TCA_CHOKE_MAX_P]) >= sizeof(__u32))
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max_P = rta_getattr_u32(tb[TCA_CHOKE_MAX_P]);
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print_uint(PRINT_ANY, "limit", "limit %up ", qopt->limit);
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print_uint(PRINT_ANY, "min", "min %up ", qopt->qth_min);
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print_uint(PRINT_ANY, "max", "max %up ", qopt->qth_max);
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tc_red_print_flags(qopt->flags);
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if (show_details) {
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print_uint(PRINT_ANY, "ewma", "ewma %u ", qopt->Wlog);
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if (max_P)
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print_float(PRINT_ANY, "probability",
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"probability %lg ", max_P / pow(2, 32));
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else
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print_uint(PRINT_ANY, "Plog", "Plog %u ", qopt->Plog);
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print_uint(PRINT_ANY, "Scell_log", "Scell_log %u",
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qopt->Scell_log);
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}
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return 0;
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}
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static int choke_print_xstats(struct qdisc_util *qu, FILE *f,
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struct rtattr *xstats)
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{
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struct tc_choke_xstats *st;
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if (xstats == NULL)
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return 0;
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if (RTA_PAYLOAD(xstats) < sizeof(*st))
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return -1;
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st = RTA_DATA(xstats);
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print_uint(PRINT_ANY, "marked", " marked %u", st->marked);
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print_uint(PRINT_ANY, "early", " early %u", st->early);
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print_uint(PRINT_ANY, "pdrop", " pdrop %u", st->pdrop);
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print_uint(PRINT_ANY, "other", " other %u", st->other);
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print_uint(PRINT_ANY, "matched", " matched %u", st->matched);
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return 0;
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}
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struct qdisc_util choke_qdisc_util = {
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.id = "choke",
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.parse_qopt = choke_parse_opt,
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.print_qopt = choke_print_opt,
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.print_xstats = choke_print_xstats,
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};
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