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