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

tools/usbperf/Makefile

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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

tools/usbperf/usbperf.c

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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;
+}