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tools/usbperf/: measure the rate of control transfers a device can do

This commit is contained in:
Werner Almesberger 2011-07-09 23:14:41 -03:00
parent f586be4fd6
commit 97604d70f2
2 changed files with 172 additions and 0 deletions

40
tools/usbperf/Makefile Normal file
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#
# usbperf/Makefile - Wait for an USB device to appear
#
# Written 2011 by Werner Almesberger
# Copyright 2011 Werner Almesberger
#
# 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.
#
MAIN = usbperf
ifeq ($(TARGET),)
TARGET = host
endif
ifeq ($(TARGET),host)
include ../Makefile.common
else
.PHONY: all install uninstall clean spotless
all:
install:
uninstall:
clean:
rm -f $(MAIN).o
spotless: clean
rm -f $(MAIN)
endif

132
tools/usbperf/usbperf.c Normal file
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/*
* usbperf/usbperf.c - Measure the rate of control transfers a device can do
*
* Written 2011 by Werner Almesberger
* Copyright 2011 Werner Almesberger
*
* 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.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/time.h>
#include <usb.h>
#include "usbopen.h"
#define SYSFS_USB_BASE "/sys/bus/usb/devices"
static void speed(usb_dev_handle *dev)
{
struct usb_device *device = usb_device(dev);
struct usb_bus *bus = device->bus;
DIR *dir;
const struct dirent *de;
char buf[1000]; /* @@@ plenty :) */
FILE *file;
int res, devnum;
float speed;
dir = opendir(SYSFS_USB_BASE);
if (!dir) {
perror(SYSFS_USB_BASE);
exit(1);
}
while ((de = readdir(dir))) {
if (atoi(de->d_name) != atoi(bus->dirname))
continue;
sprintf(buf, SYSFS_USB_BASE "/%s/devnum", de->d_name);
file = fopen(buf, "r");
if (!file)
continue;
res = fscanf(file, "%d", &devnum);
fclose(file);
if (res != 1 || devnum != atoi(device->filename))
continue;
sprintf(buf, SYSFS_USB_BASE "/%s/speed", de->d_name);
file = fopen(buf, "r");
if (!file)
continue;
res = fscanf(file, "%f", &speed);
fclose(file);
printf("%g Mbps\n", speed);
}
closedir(dir);
}
static void rounds(usb_dev_handle *dev, int n)
{
struct timeval t0, t1, t2;
double s = 0, d;
char buf;
int i, res;
gettimeofday(&t0, NULL);
for (i = 0; i != n; i++) {
gettimeofday(&t1, NULL);
/* GET_CONFIGURATION */
res = usb_control_msg(dev, USB_ENDPOINT_IN | USB_RECIP_DEVICE,
USB_REQ_GET_CONFIGURATION, 0, 0, &buf, 1, 1000);
if (res < 0)
fprintf(stderr, "usb_control_msg returns %d\n", res);
gettimeofday(&t2, NULL);
s += (t2.tv_sec-t1.tv_sec)+(t2.tv_usec-t1.tv_usec)*1e-6;
}
d = (t2.tv_sec-t0.tv_sec)+(t2.tv_usec-t0.tv_usec)*1e-6;
printf("Overall: %.3f ms/req\n", d/n*1000.0);
printf("Each: %.3f ms/req\n", s/n*1000.0);
}
static void usage(const char *name)
{
fprintf(stderr,
"usage: %s [vendor]:[product] [rounds]\n"
, name);
exit(1);
}
int main(int argc, char **argv)
{
usb_dev_handle *dev;
int n = 1000;
switch (argc) {
case 2:
break;
case 3:
n = atoi(argv[2]);
if (n <= 0)
usage(*argv);
break;
default:
usage(*argv);
}
parse_usb_id(argv[1]);
dev = open_usb(0, 0);
if (!dev)
return 1;
speed(dev);
rounds(dev, n);
return 0;
}