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/*
* tc_core.c TC core library.
*
* 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 <math.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include "tc_core.h"
static __u32 t2us=1;
static __u32 us2t=1;
static double tick_in_usec = 1;
long tc_core_usec2tick(long usec)
{
return usec*tick_in_usec;
}
long tc_core_tick2usec(long tick)
{
return tick/tick_in_usec;
}
unsigned tc_calc_xmittime(unsigned rate, unsigned size)
{
return tc_core_usec2tick(1000000*((double)size/rate));
}
/*
rtab[pkt_len>>cell_log] = pkt_xmit_time
*/
int tc_calc_rtable(unsigned bps, __u32 *rtab, int cell_log, unsigned mtu,
unsigned mpu)
{
int i;
unsigned overhead = (mpu >> 8) & 0xFF;
mpu = mpu & 0xFF;
if (mtu == 0)
mtu = 2047;
if (cell_log < 0) {
cell_log = 0;
while ((mtu>>cell_log) > 255)
cell_log++;
}
for (i=0; i<256; i++) {
unsigned sz = (i<<cell_log);
if (overhead)
sz += overhead;
if (sz < mpu)
sz = mpu;
rtab[i] = tc_core_usec2tick(1000000*((double)sz/bps));
}
return cell_log;
}
int tc_core_init()
{
FILE *fp = fopen("/proc/net/psched", "r");
if (fp == NULL)
return -1;
if (fscanf(fp, "%08x%08x", &t2us, &us2t) != 2) {
fclose(fp);
return -1;
}
fclose(fp);
tick_in_usec = (double)t2us/us2t;
return 0;
}
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