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https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-15 22:15:13 +08:00
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
/*
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* tc_core.c TC core library.
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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: 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 <math.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 "tc_core.h"
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static __u32 t2us=1;
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static __u32 us2t=1;
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static double tick_in_usec = 1;
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long tc_core_usec2tick(long usec)
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{
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return usec*tick_in_usec;
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}
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long tc_core_tick2usec(long tick)
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{
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return tick/tick_in_usec;
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}
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unsigned tc_calc_xmittime(unsigned rate, unsigned size)
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{
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return tc_core_usec2tick(1000000*((double)size/rate));
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}
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/*
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rtab[pkt_len>>cell_log] = pkt_xmit_time
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*/
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int tc_calc_rtable(unsigned bps, __u32 *rtab, int cell_log, unsigned mtu,
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unsigned mpu)
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{
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int i;
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unsigned overhead = (mpu >> 8) & 0xFF;
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mpu = mpu & 0xFF;
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if (mtu == 0)
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mtu = 2047;
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if (cell_log < 0) {
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cell_log = 0;
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while ((mtu>>cell_log) > 255)
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cell_log++;
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}
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for (i=0; i<256; i++) {
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unsigned sz = (i<<cell_log);
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if (overhead)
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sz += overhead;
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if (sz < mpu)
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sz = mpu;
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rtab[i] = tc_core_usec2tick(1000000*((double)sz/bps));
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}
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return cell_log;
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}
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int tc_core_init()
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{
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FILE *fp = fopen("/proc/net/psched", "r");
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if (fp == NULL)
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return -1;
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if (fscanf(fp, "%08x%08x", &t2us, &us2t) != 2) {
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fclose(fp);
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return -1;
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}
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fclose(fp);
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tick_in_usec = (double)t2us/us2t;
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return 0;
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}
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