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a77905ef6a
This is more helpful to the user, since the command takes two forms, and the message that would otherwise appear about missing parameters assumes one of those forms. Signed-off-by: David Ward <david.ward@ll.mit.edu>
332 lines
8.4 KiB
C
332 lines
8.4 KiB
C
/*
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* q_gred.c GRED.
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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: J Hadi Salim(hadi@nortelnetworks.com)
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* code ruthlessly ripped from
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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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 <syslog.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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#if 0
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#define DPRINTF(format,args...) fprintf(stderr,format,##args)
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#else
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#define DPRINTF(format,args...)
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#endif
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static void explain(void)
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{
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fprintf(stderr, "Usage: ... gred DP drop-probability limit BYTES "
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"min BYTES max BYTES\n");
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fprintf(stderr, " avpkt BYTES burst PACKETS probability PROBABILITY "
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"bandwidth KBPS\n");
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fprintf(stderr, " [prio value]\n");
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fprintf(stderr," OR ...\n");
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fprintf(stderr," gred setup DPs <num of DPs> default <default DP> "
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"[grio]\n");
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}
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static int init_gred(struct qdisc_util *qu, int argc, char **argv,
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struct nlmsghdr *n)
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{
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struct rtattr *tail;
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struct tc_gred_sopt opt = { 0 };
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int dps = 0;
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int def_dp = -1;
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while (argc > 0) {
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DPRINTF(stderr,"init_gred: invoked with %s\n",*argv);
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if (strcmp(*argv, "DPs") == 0) {
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NEXT_ARG();
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DPRINTF(stderr,"init_gred: next_arg with %s\n",*argv);
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dps = strtol(*argv, (char **)NULL, 10);
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if (dps < 0 || dps >MAX_DPs) {
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fprintf(stderr, "DPs =%d\n", dps);
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fprintf(stderr, "Illegal \"DPs\"\n");
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fprintf(stderr, "GRED: only %d DPs are "
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"currently supported\n",MAX_DPs);
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return -1;
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}
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} else if (strcmp(*argv, "default") == 0) {
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NEXT_ARG();
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def_dp = strtol(*argv, (char **)NULL, 10);
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if (dps == 0) {
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fprintf(stderr, "\"default DP\" must be "
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"defined after DPs\n");
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return -1;
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}
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if (def_dp < 0 || def_dp > dps) {
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fprintf(stderr,
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"\"default DP\" must be less than %d\n",
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opt.DPs);
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return -1;
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}
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} else if (strcmp(*argv, "grio") == 0) {
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opt.grio = 1;
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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 (!dps || def_dp == -1) {
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fprintf(stderr, "Illegal gred setup parameters \n");
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return -1;
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}
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opt.DPs = dps;
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opt.def_DP = def_dp;
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DPRINTF("TC_GRED: sending DPs=%d default=%d\n",opt.DPs,opt.def_DP);
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n->nlmsg_flags|=NLM_F_CREATE;
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tail = NLMSG_TAIL(n);
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addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
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addattr_l(n, 1024, TCA_GRED_DPS, &opt, sizeof(struct tc_gred_sopt));
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tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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return 0;
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}
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/*
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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*/
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static int gred_parse_opt(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n)
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{
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int ok=0;
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struct tc_gred_qopt opt;
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unsigned burst = 0;
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unsigned avpkt = 0;
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double probability = 0.02;
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unsigned rate = 0;
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int parm;
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__u8 sbuf[256];
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struct rtattr *tail;
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__u32 max_P;
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memset(&opt, 0, sizeof(opt));
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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_size(&opt.limit, *argv)) {
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fprintf(stderr, "Illegal \"limit\"\n");
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "setup") == 0) {
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if (ok) {
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fprintf(stderr, "Illegal \"setup\"\n");
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return -1;
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}
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return init_gred(qu, argc-1, argv+1, n);
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} else if (strcmp(*argv, "min") == 0) {
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NEXT_ARG();
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if (get_size(&opt.qth_min, *argv)) {
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fprintf(stderr, "Illegal \"min\"\n");
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "max") == 0) {
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NEXT_ARG();
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if (get_size(&opt.qth_max, *argv)) {
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fprintf(stderr, "Illegal \"max\"\n");
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return -1;
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}
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ok++;
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} else if (strcmp(*argv, "DP") == 0) {
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NEXT_ARG();
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opt.DP=strtol(*argv, (char **)NULL, 10);
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DPRINTF ("\n ******* DP =%u\n",opt.DP);
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if (opt.DP >MAX_DPs) { /* need a better error check */
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fprintf(stderr, "DP =%u \n",opt.DP);
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fprintf(stderr, "Illegal \"DP\"\n");
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fprintf(stderr, "GRED: only %d DPs are currently supported\n",MAX_DPs);
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return -1;
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}
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ok++;
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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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ok++;
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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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ok++;
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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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ok++;
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} else if (strcmp(*argv, "prio") == 0) {
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NEXT_ARG();
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opt.prio=strtol(*argv, (char **)NULL, 10);
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/* some error check here */
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ok++;
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} else if (strcmp(*argv, "bandwidth") == 0) {
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NEXT_ARG();
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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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ok++;
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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 (!ok) {
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explain();
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return -1;
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}
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if (!opt.qth_min || !opt.qth_max || !opt.limit || !avpkt ||
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(opt.DP<0)) {
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fprintf(stderr, "Required parameter (min, max, limit, "
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"avpkt, DP) is missing\n");
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return -1;
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}
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if (!burst) {
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burst = (2 * opt.qth_min + opt.qth_max) / (3 * avpkt);
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fprintf(stderr, "GRED: set burst to %u\n", burst);
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}
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if (!rate) {
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get_rate(&rate, "10Mbit");
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fprintf(stderr, "GRED: set bandwidth to 10Mbit\n");
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}
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if ((parm = tc_red_eval_ewma(opt.qth_min, burst, avpkt)) < 0) {
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fprintf(stderr, "GRED: failed to calculate EWMA constant.\n");
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return -1;
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}
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if (parm >= 10)
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fprintf(stderr, "GRED: WARNING. Burst %u seems to be too "
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"large.\n", burst);
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opt.Wlog = parm;
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if ((parm = tc_red_eval_P(opt.qth_min, opt.qth_max, probability)) < 0) {
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fprintf(stderr, "GRED: failed to calculate probability.\n");
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return -1;
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}
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opt.Plog = parm;
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if ((parm = tc_red_eval_idle_damping(opt.Wlog, avpkt, rate, sbuf)) < 0)
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{
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fprintf(stderr, "GRED: failed to calculate idle damping "
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"table.\n");
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return -1;
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}
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opt.Scell_log = parm;
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tail = NLMSG_TAIL(n);
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addattr_l(n, 1024, TCA_OPTIONS, NULL, 0);
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addattr_l(n, 1024, TCA_GRED_PARMS, &opt, sizeof(opt));
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addattr_l(n, 1024, TCA_GRED_STAB, sbuf, 256);
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max_P = probability * pow(2, 32);
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addattr32(n, 1024, TCA_GRED_MAX_P, max_P);
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tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
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return 0;
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}
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static int gred_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
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{
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struct rtattr *tb[TCA_GRED_MAX + 1];
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struct tc_gred_qopt *qopt;
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__u32 *max_p = NULL;
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int i;
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SPRINT_BUF(b1);
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SPRINT_BUF(b2);
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SPRINT_BUF(b3);
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SPRINT_BUF(b4);
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SPRINT_BUF(b5);
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if (opt == NULL)
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return 0;
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parse_rtattr_nested(tb, TCA_GRED_MAX, opt);
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if (tb[TCA_GRED_PARMS] == NULL)
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return -1;
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if (tb[TCA_GRED_MAX_P] &&
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RTA_PAYLOAD(tb[TCA_GRED_MAX_P]) >= sizeof(__u32) * MAX_DPs)
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max_p = RTA_DATA(tb[TCA_GRED_MAX_P]);
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qopt = RTA_DATA(tb[TCA_GRED_PARMS]);
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if (RTA_PAYLOAD(tb[TCA_GRED_PARMS]) < sizeof(*qopt)*MAX_DPs) {
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fprintf(f,"\n GRED received message smaller than expected\n");
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return -1;
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}
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/* Bad hack! should really return a proper message as shown above*/
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for (i=0;i<MAX_DPs;i++, qopt++) {
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if (qopt->DP >= MAX_DPs) continue;
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fprintf(f, "\n DP:%d (prio %d) Average Queue %s Measured "
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"Queue %s ",
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qopt->DP,
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qopt->prio,
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sprint_size(qopt->qave, b4),
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sprint_size(qopt->backlog, b5));
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fprintf(f, "\n\t Packet drops: %d (forced %d early %d) ",
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qopt->forced+qopt->early,
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qopt->forced,
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qopt->early);
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fprintf(f, "\n\t Packet totals: %u (bytes %u) ",
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qopt->packets,
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qopt->bytesin);
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if (show_details)
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fprintf(f, "\n limit %s min %s max %s ",
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sprint_size(qopt->limit, b1),
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sprint_size(qopt->qth_min, b2),
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sprint_size(qopt->qth_max, b3));
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fprintf(f, "ewma %u ", qopt->Wlog);
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if (max_p)
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fprintf(f, "probability %lg ", max_p[i] / pow(2, 32));
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else
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fprintf(f, "Plog %u ", qopt->Plog);
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fprintf(f, "Scell_log %u", qopt->Scell_log);
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}
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return 0;
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}
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struct qdisc_util gred_qdisc_util = {
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.id = "gred",
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.parse_qopt = gred_parse_opt,
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.print_qopt = gred_print_opt,
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};
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