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Date: Fri, 16 Sep 2016 16:22:03 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Cc: Johan Hovold <johan@...oldconsulting.com>,
Rui Miguel Silva <rmfrfs@...il.com>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Sandeep Patil <sspatil@...gle.com>,
Matt Porter <mporter@...nel.crashing.org>,
John Stultz <john.stultz@...aro.org>,
Rob Herring <robh@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Alex Elder <elder@...aro.org>, David Lin <dtwlin@...gle.com>,
Bryan O'Donoghue <pure.logic@...us-software.ie>,
Vaibhav Agarwal <vaibhav.agarwal@...aro.org>,
Mark Greer <mgreer@...malcreek.com>
Subject: [patch 30/32] greybus: tools
Here are a few Greybus userspace tools that are useful for testing.
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/greybus/tools/.gitignore | 1
drivers/greybus/tools/Android.mk | 10
drivers/greybus/tools/Makefile | 31 +
drivers/greybus/tools/README.loopback | 198 ++++++
drivers/greybus/tools/lbtest | 168 +++++
drivers/greybus/tools/loopback_test.c | 1000 ++++++++++++++++++++++++++++++++++
6 files changed, 1408 insertions(+)
--- /dev/null
+++ b/drivers/greybus/tools/.gitignore
@@ -0,0 +1 @@
+loopback_test
--- /dev/null
+++ b/drivers/greybus/tools/Android.mk
@@ -0,0 +1,10 @@
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= loopback_test.c
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE := gb_loopback_test
+
+include $(BUILD_EXECUTABLE)
+
--- /dev/null
+++ b/drivers/greybus/tools/Makefile
@@ -0,0 +1,31 @@
+ifeq ($(strip $(V)), 1)
+ Q =
+else
+ Q = @
+endif
+
+CFLAGS += -std=gnu99 -Wall -Wextra -g \
+ -D_GNU_SOURCE \
+ -Wno-unused-parameter \
+ -Wmaybe-uninitialized \
+ -Wredundant-decls \
+ -Wcast-align \
+ -Wsign-compare \
+ -Wno-missing-field-initializers
+
+CC := $(CROSS_COMPILE)gcc
+
+TOOLS = loopback_test
+
+all: $(TOOLS)
+
+%.o: %.c ../greybus_protocols.h
+ @echo ' TARGET_CC $@'
+ $(Q)$(CC) $(CFLAGS) -c $< -o $@
+
+loopback_%: loopback_%.o
+ @echo ' TARGET_LD $@'
+ $(Q)$(CC) $(CFLAGS) $(LDFLAGS) $^ -o $@
+
+clean::
+ rm -f *.o $(TOOLS)
--- /dev/null
+++ b/drivers/greybus/tools/README.loopback
@@ -0,0 +1,198 @@
+
+
+ 1 - LOOPBACK DRIVER
+
+The driver implements the main logic of the loopback test and provides
+sysfs files to configure the test and retrieve the results.
+A user could run a test without the need of the test application given
+that he understands the sysfs interface of the loopback driver.
+
+The loopback kernel driver needs to be loaded and at least one module
+with the loopback feature enabled must be present for the sysfs files to be
+created and for the loopback test application to be able to run.
+
+To load the module:
+# modprobe gb-loopback
+
+
+When the module is probed, New files are available on the sysfs
+directory of the detected loopback device.
+(typically under "/sys/bus/graybus/devices").
+
+Here is a short summary of the sysfs interface files that should be visible:
+
+* Loopback Configuration Files:
+ async - Use asynchronous operations.
+ iteration_max - Number of tests iterations to perform.
+ size - payload size of the transfer.
+ timeout - The number of microseconds to give an individual
+ asynchronous request before timing out.
+ us_wait - Time to wait between 2 messages
+ type - By writing the test type to this file, the test starts.
+ Valid tests are:
+ 0 stop the test
+ 2 - ping
+ 3 - transfer
+ 4 - sink
+
+* Loopback feedback files:
+ error - number of errors that have occurred.
+ iteration_count - Number of iterations performed.
+ requests_completed - Number of requests successfully completed.
+ requests_timedout - Number of requests that have timed out.
+ timeout_max - Max allowed timeout
+ timeout_min - Min allowed timeout.
+
+* Loopback result files:
+ apbridge_unipro_latency_avg
+ apbridge_unipro_latency_max
+ apbridge_unipro_latency_min
+ gpbridge_firmware_latency_avg
+ gpbridge_firmware_latency_max
+ gpbridge_firmware_latency_min
+ requests_per_second_avg
+ requests_per_second_max
+ requests_per_second_min
+ latency_avg
+ latency_max
+ latency_min
+ throughput_avg
+ throughput_max
+ throughput_min
+
+
+
+ 2 - LOOPBACK TEST APPLICATION
+
+The loopback test application manages and formats the results provided by
+the loopback kernel module. The purpose of this application
+is to:
+ - Start and manage multiple loopback device tests concurrently.
+ - Calculate the aggregate results for multiple devices.
+ - Gather and format test results (csv or human readable).
+
+The best way to get up to date usage information for the application is
+usually to pass the "-h" parameter.
+Here is the summary of the available options:
+
+ Mandatory arguments
+ -t must be one of the test names - sink, transfer or ping
+ -i iteration count - the number of iterations to run the test over
+ Optional arguments
+ -S sysfs location - location for greybus 'endo' entires default /sys/bus/greybus/devices/
+ -D debugfs location - location for loopback debugfs entries default /sys/kernel/debug/gb_loopback/
+ -s size of data packet to send during test - defaults to zero
+ -m mask - a bit mask of connections to include example: -m 8 = 4th connection -m 9 = 1st and 4th connection etc
+ default is zero which means broadcast to all connections
+ -v verbose output
+ -d debug output
+ -r raw data output - when specified the full list of latency values are included in the output CSV
+ -p porcelain - when specified printout is in a user-friendly non-CSV format. This option suppresses writing to CSV file
+ -a aggregate - show aggregation of all enabled devies
+ -l list found loopback devices and exit.
+ -x Async - Enable async transfers.
+ -o Timeout - Timeout in microseconds for async operations.
+
+
+
+ 3 - REAL WORLD EXAMPLE USAGES
+
+ 3.1 - Using the driver sysfs files to run a test on a single device:
+
+* Run a 1000 transfers of a 100 byte packet. Each transfer is started only
+after the previous one finished successfully:
+ echo 0 > /sys/bus/greybus/devices/1-2.17/type
+ echo 0 > /sys/bus/greybus/devices/1-2.17/async
+ echo 2000 > /sys/bus/greybus/devices/1-2.17/us_wait
+ echo 100 > /sys/bus/greybus/devices/1-2.17/size
+ echo 1000 > /sys/bus/greybus/devices/1-2.17/iteration_max
+ echo 0 > /sys/bus/greybus/devices/1-2.17/mask
+ echo 200000 > /sys/bus/greybus/devices/1-2.17/timeout
+ echo 3 > /sys/bus/greybus/devices/1-2.17/type
+
+* Run a 1000 transfers of a 100 byte packet. Transfers are started without
+waiting for the previous one to finish:
+ echo 0 > /sys/bus/greybus/devices/1-2.17/type
+ echo 3 > /sys/bus/greybus/devices/1-2.17/async
+ echo 0 > /sys/bus/greybus/devices/1-2.17/us_wait
+ echo 100 > /sys/bus/greybus/devices/1-2.17/size
+ echo 1000 > /sys/bus/greybus/devices/1-2.17/iteration_max
+ echo 0 > /sys/bus/greybus/devices/1-2.17/mask
+ echo 200000 > /sys/bus/greybus/devices/1-2.17/timeout
+ echo 3 > /sys/bus/greybus/devices/1-2.17/type
+
+* Read the results from sysfs:
+ cat /sys/bus/greybus/devices/1-2.17/requests_per_second_min
+ cat /sys/bus/greybus/devices/1-2.17/requests_per_second_max
+ cat /sys/bus/greybus/devices/1-2.17/requests_per_second_avg
+
+ cat /sys/bus/greybus/devices/1-2.17/latency_min
+ cat /sys/bus/greybus/devices/1-2.17/latency_max
+ cat /sys/bus/greybus/devices/1-2.17/latency_avg
+
+ cat /sys/bus/greybus/devices/1-2.17/apbridge_unipro_latency_min
+ cat /sys/bus/greybus/devices/1-2.17/apbridge_unipro_latency_max
+ cat /sys/bus/greybus/devices/1-2.17/apbridge_unipro_latency_avg
+
+ cat /sys/bus/greybus/devices/1-2.17/gpbridge_firmware_latency_min
+ cat /sys/bus/greybus/devices/1-2.17/gpbridge_firmware_latency_max
+ cat /sys/bus/greybus/devices/1-2.17/gpbridge_firmware_latency_avg
+
+ cat /sys/bus/greybus/devices/1-2.17/error
+ cat /sys/bus/greybus/devices/1-2.17/requests_completed
+ cat /sys/bus/greybus/devices/1-2.17/requests_timedout
+
+
+3.2 - using the test application:
+
+* Run a transfer test 10 iterations of size 100 bytes on all available devices
+ #/loopback_test -t transfer -i 10 -s 100
+ 1970-1-1 0:10:7,transfer,1-4.17,100,10,0,443,509,471.700012,66,1963,2256,2124.600098,293,102776,118088,109318.898438,15312,1620,1998,1894.099976,378,56,57,56.799999,1
+ 1970-1-1 0:10:7,transfer,1-5.17,100,10,0,399,542,463.399994,143,1845,2505,2175.800049,660,92568,125744,107393.296875,33176,1469,2305,1806.500000,836,56,57,56.799999,1
+
+
+* Show the aggregate results of both devices. ("-a")
+ #/loopback_test -t transfer -i 10 -s 100 -a
+ 1970-1-1 0:10:35,transfer,1-4.17,100,10,0,448,580,494.100006,132,1722,2230,2039.400024,508,103936,134560,114515.703125,30624,1513,1980,1806.900024,467,56,57,57.299999,1
+ 1970-1-1 0:10:35,transfer,1-5.17,100,10,0,383,558,478.600006,175,1791,2606,2115.199951,815,88856,129456,110919.703125,40600,1457,2246,1773.599976,789,56,57,57.099998,1
+ 1970-1-1 0:10:35,transfer,aggregate,100,10,0,383,580,486.000000,197,1722,2606,2077.000000,884,88856,134560,112717.000000,45704,1457,2246,1789.000000,789,56,57,57.000000,1
+
+* Example usage of the mask option to select which devices will
+ run the test (1st, 2nd, or both devices):
+ # /loopback_test -t transfer -i 10 -s 100 -m 1
+ 1970-1-1 0:11:56,transfer,1-4.17,100,10,0,514,558,544.900024,44,1791,1943,1836.599976,152,119248,129456,126301.296875,10208,1600,1001609,101613.601562,1000009,56,57,56.900002,1
+ # /loopback_test -t transfer -i 10 -s 100 -m 2
+ 1970-1-1 0:12:0,transfer,1-5.17,100,10,0,468,554,539.000000,86,1804,2134,1859.500000,330,108576,128528,124932.500000,19952,1606,1626,1619.300049,20,56,57,57.400002,1
+ # /loopback_test -t transfer -i 10 -s 100 -m 3
+ 1970-1-1 0:12:3,transfer,1-4.17,100,10,0,432,510,469.399994,78,1959,2313,2135.800049,354,100224,118320,108785.296875,18096,1610,2024,1893.500000,414,56,57,57.200001,1
+ 1970-1-1 0:12:3,transfer,1-5.17,100,10,0,404,542,468.799988,138,1843,2472,2152.500000,629,93728,125744,108646.101562,32016,1504,2247,1853.099976,743,56,57,57.099998,1
+
+* Show output in human readable format ("-p")
+ # /loopback_test -t transfer -i 10 -s 100 -m 3 -p
+
+ 1970-1-1 0:12:37
+ test: transfer
+ path: 1-4.17
+ size: 100
+ iterations: 10
+ errors: 0
+ async: Disabled
+ requests per-sec: min=390, max=547, average=469.299988, jitter=157
+ ap-throughput B/s: min=90480 max=126904 average=108762.101562 jitter=36424
+ ap-latency usec: min=1826 max=2560 average=2146.000000 jitter=734
+ apbridge-latency usec: min=1620 max=1982 average=1882.099976 jitter=362
+ gpbridge-latency usec: min=56 max=57 average=57.099998 jitter=1
+
+
+ 1970-1-1 0:12:37
+ test: transfer
+ path: 1-5.17
+ size: 100
+ iterations: 10
+ errors: 0
+ async: Disabled
+ requests per-sec: min=397, max=538, average=461.700012, jitter=141
+ ap-throughput B/s: min=92104 max=124816 average=106998.898438 jitter=32712
+ ap-latency usec: min=1856 max=2514 average=2185.699951 jitter=658
+ apbridge-latency usec: min=1460 max=2296 average=1828.599976 jitter=836
+ gpbridge-latency usec: min=56 max=57 average=57.099998 jitter=1
--- /dev/null
+++ b/drivers/greybus/tools/lbtest
@@ -0,0 +1,168 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2015 Google, Inc.
+# Copyright (c) 2015 Linaro, Ltd.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+# contributors may be used to endorse or promote products derived from this
+# software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from __future__ import print_function
+import csv
+import datetime
+import sys
+import time
+
+dict = {'ping': '2', 'transfer': '3', 'sink': '4'}
+verbose = 1
+
+def abort():
+ sys.exit(1)
+
+def usage():
+ print('Usage: looptest TEST SIZE ITERATIONS PATH\n\n'
+ ' Run TEST for a number of ITERATIONS with operation data SIZE bytes\n'
+ ' TEST may be \'ping\' \'transfer\' or \'sink\'\n'
+ ' SIZE indicates the size of transfer <= greybus max payload bytes\n'
+ ' ITERATIONS indicates the number of times to execute TEST at SIZE bytes\n'
+ ' Note if ITERATIONS is set to zero then this utility will\n'
+ ' initiate an infinite (non terminating) test and exit\n'
+ ' without logging any metrics data\n'
+ ' PATH indicates the sysfs path for the loopback greybus entries e.g.\n'
+ ' /sys/bus/greybus/devices/endo0:1:1:1:1/\n'
+ 'Examples:\n'
+ ' looptest transfer 128 10000\n'
+ ' looptest ping 0 128\n'
+ ' looptest sink 2030 32768\n'
+ .format(sys.argv[0]), file=sys.stderr)
+
+ abort()
+
+def read_sysfs_int(path):
+ try:
+ f = open(path, "r");
+ val = f.read();
+ f.close()
+ return int(val)
+ except IOError as e:
+ print("I/O error({0}): {1}".format(e.errno, e.strerror))
+ print("Invalid path %s" % path)
+
+def write_sysfs_val(path, val):
+ try:
+ f = open(path, "r+")
+ f.write(val)
+ f.close()
+ except IOError as e:
+ print("I/O error({0}): {1}".format(e.errno, e.strerror))
+ print("Invalid path %s" % path)
+
+def log_csv(test_name, size, iteration_max, sys_pfx):
+ # file name will test_name_size_iteration_max.csv
+ # every time the same test with the same parameters is run we will then
+ # append to the same CSV with datestamp - representing each test dataset
+ fname = test_name + '_' + size + '_' + str(iteration_max) + '.csv'
+
+ try:
+ # gather data set
+ date = str(datetime.datetime.now())
+ error = read_sysfs_int(sys_pfx + 'error')
+ request_min = read_sysfs_int(sys_pfx + 'requests_per_second_min')
+ request_max = read_sysfs_int(sys_pfx + 'requests_per_second_max')
+ request_avg = read_sysfs_int(sys_pfx + 'requests_per_second_avg')
+ latency_min = read_sysfs_int(sys_pfx + 'latency_min')
+ latency_max = read_sysfs_int(sys_pfx + 'latency_max')
+ latency_avg = read_sysfs_int(sys_pfx + 'latency_avg')
+ throughput_min = read_sysfs_int(sys_pfx + 'throughput_min')
+ throughput_max = read_sysfs_int(sys_pfx + 'throughput_max')
+ throughput_avg = read_sysfs_int(sys_pfx + 'throughput_avg')
+
+ # derive jitter
+ request_jitter = request_max - request_min
+ latency_jitter = latency_max - latency_min
+ throughput_jitter = throughput_max - throughput_min
+
+ # append data set to file
+ with open(fname, 'a') as csvf:
+ row = csv.writer(csvf, delimiter=",", quotechar="'",
+ quoting=csv.QUOTE_MINIMAL)
+ row.writerow([date, test_name, size, iteration_max, error,
+ request_min, request_max, request_avg, request_jitter,
+ latency_min, latency_max, latency_avg, latency_jitter,
+ throughput_min, throughput_max, throughput_avg, throughput_jitter])
+ except IOError as e:
+ print("I/O error({0}): {1}".format(e.errno, e.strerror))
+
+def loopback_run(test_name, size, iteration_max, sys_pfx):
+ test_id = dict[test_name]
+ try:
+ # Terminate any currently running test
+ write_sysfs_val(sys_pfx + 'type', '0')
+ # Set parameter for no wait between messages
+ write_sysfs_val(sys_pfx + 'ms_wait', '0')
+ # Set operation size
+ write_sysfs_val(sys_pfx + 'size', size)
+ # Set iterations
+ write_sysfs_val(sys_pfx + 'iteration_max', str(iteration_max))
+ # Initiate by setting loopback operation type
+ write_sysfs_val(sys_pfx + 'type', test_id)
+ time.sleep(1)
+
+ if iteration_max == 0:
+ print ("Infinite test initiated CSV won't be logged\n")
+ return
+
+ previous = 0
+ err = 0
+ while True:
+ # get current count bail out if it hasn't changed
+ iteration_count = read_sysfs_int(sys_pfx + 'iteration_count')
+ if previous == iteration_count:
+ err = 1
+ break
+ elif iteration_count == iteration_max:
+ break
+ previous = iteration_count
+ if verbose:
+ print('%02d%% complete %d of %d ' %
+ (100 * iteration_count / iteration_max,
+ iteration_count, iteration_max))
+ time.sleep(1)
+ if err:
+ print ('\nError executing test\n')
+ else:
+ log_csv(test_name, size, iteration_max, sys_pfx)
+ except ValueError as ve:
+ print("Error: %s " % format(e.strerror), file=sys.stderr)
+ abort()
+
+def main():
+ if len(sys.argv) < 5:
+ usage()
+
+ if sys.argv[1] in dict.keys():
+ loopback_run(sys.argv[1], sys.argv[2], int(sys.argv[3]), sys.argv[4])
+ else:
+ usage()
+if __name__ == '__main__':
+ main()
--- /dev/null
+++ b/drivers/greybus/tools/loopback_test.c
@@ -0,0 +1,1000 @@
+/*
+ * Loopback test application
+ *
+ * Copyright 2015 Google Inc.
+ * Copyright 2015 Linaro Ltd.
+ *
+ * Provided under the three clause BSD license found in the LICENSE file.
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <poll.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <signal.h>
+
+#define MAX_NUM_DEVICES 10
+#define MAX_SYSFS_PATH 0x200
+#define CSV_MAX_LINE 0x1000
+#define SYSFS_MAX_INT 0x20
+#define MAX_STR_LEN 255
+#define DEFAULT_ASYNC_TIMEOUT 200000
+
+struct dict {
+ char *name;
+ int type;
+};
+
+static struct dict dict[] = {
+ {"ping", 2},
+ {"transfer", 3},
+ {"sink", 4},
+ {NULL,} /* list termination */
+};
+
+struct loopback_results {
+ float latency_avg;
+ uint32_t latency_max;
+ uint32_t latency_min;
+ uint32_t latency_jitter;
+
+ float request_avg;
+ uint32_t request_max;
+ uint32_t request_min;
+ uint32_t request_jitter;
+
+ float throughput_avg;
+ uint32_t throughput_max;
+ uint32_t throughput_min;
+ uint32_t throughput_jitter;
+
+ float apbridge_unipro_latency_avg;
+ uint32_t apbridge_unipro_latency_max;
+ uint32_t apbridge_unipro_latency_min;
+ uint32_t apbridge_unipro_latency_jitter;
+
+ float gbphy_firmware_latency_avg;
+ uint32_t gbphy_firmware_latency_max;
+ uint32_t gbphy_firmware_latency_min;
+ uint32_t gbphy_firmware_latency_jitter;
+
+ uint32_t error;
+};
+
+struct loopback_device {
+ char name[MAX_SYSFS_PATH];
+ char sysfs_entry[MAX_SYSFS_PATH];
+ char debugfs_entry[MAX_SYSFS_PATH];
+ struct loopback_results results;
+};
+
+struct loopback_test {
+ int verbose;
+ int debug;
+ int raw_data_dump;
+ int porcelain;
+ int mask;
+ int size;
+ int iteration_max;
+ int aggregate_output;
+ int test_id;
+ int device_count;
+ int list_devices;
+ int use_async;
+ int async_timeout;
+ int async_outstanding_operations;
+ int us_wait;
+ int file_output;
+ int stop_all;
+ int poll_count;
+ char test_name[MAX_STR_LEN];
+ char sysfs_prefix[MAX_SYSFS_PATH];
+ char debugfs_prefix[MAX_SYSFS_PATH];
+ struct timespec poll_timeout;
+ struct loopback_device devices[MAX_NUM_DEVICES];
+ struct loopback_results aggregate_results;
+ struct pollfd fds[MAX_NUM_DEVICES];
+};
+
+struct loopback_test t;
+
+/* Helper macros to calculate the aggregate results for all devices */
+static inline int device_enabled(struct loopback_test *t, int dev_idx);
+
+#define GET_MAX(field) \
+static int get_##field##_aggregate(struct loopback_test *t) \
+{ \
+ uint32_t max = 0; \
+ int i; \
+ for (i = 0; i < t->device_count; i++) { \
+ if (!device_enabled(t, i)) \
+ continue; \
+ if (t->devices[i].results.field > max) \
+ max = t->devices[i].results.field; \
+ } \
+ return max; \
+} \
+
+#define GET_MIN(field) \
+static int get_##field##_aggregate(struct loopback_test *t) \
+{ \
+ uint32_t min = ~0; \
+ int i; \
+ for (i = 0; i < t->device_count; i++) { \
+ if (!device_enabled(t, i)) \
+ continue; \
+ if (t->devices[i].results.field < min) \
+ min = t->devices[i].results.field; \
+ } \
+ return min; \
+} \
+
+#define GET_AVG(field) \
+static int get_##field##_aggregate(struct loopback_test *t) \
+{ \
+ uint32_t val = 0; \
+ uint32_t count = 0; \
+ int i; \
+ for (i = 0; i < t->device_count; i++) { \
+ if (!device_enabled(t, i)) \
+ continue; \
+ count++; \
+ val += t->devices[i].results.field; \
+ } \
+ if (count) \
+ val /= count; \
+ return val; \
+} \
+
+GET_MAX(throughput_max);
+GET_MAX(request_max);
+GET_MAX(latency_max);
+GET_MAX(apbridge_unipro_latency_max);
+GET_MAX(gbphy_firmware_latency_max);
+GET_MIN(throughput_min);
+GET_MIN(request_min);
+GET_MIN(latency_min);
+GET_MIN(apbridge_unipro_latency_min);
+GET_MIN(gbphy_firmware_latency_min);
+GET_AVG(throughput_avg);
+GET_AVG(request_avg);
+GET_AVG(latency_avg);
+GET_AVG(apbridge_unipro_latency_avg);
+GET_AVG(gbphy_firmware_latency_avg);
+
+void abort()
+{
+ _exit(1);
+}
+
+void usage(void)
+{
+ fprintf(stderr, "Usage: loopback_test TEST [SIZE] ITERATIONS [SYSPATH] [DBGPATH]\n\n"
+ " Run TEST for a number of ITERATIONS with operation data SIZE bytes\n"
+ " TEST may be \'ping\' \'transfer\' or \'sink\'\n"
+ " SIZE indicates the size of transfer <= greybus max payload bytes\n"
+ " ITERATIONS indicates the number of times to execute TEST at SIZE bytes\n"
+ " Note if ITERATIONS is set to zero then this utility will\n"
+ " initiate an infinite (non terminating) test and exit\n"
+ " without logging any metrics data\n"
+ " SYSPATH indicates the sysfs path for the loopback greybus entries e.g.\n"
+ " /sys/bus/greybus/devices\n"
+ " DBGPATH indicates the debugfs path for the loopback greybus entries e.g.\n"
+ " /sys/kernel/debug/gb_loopback/\n"
+ " Mandatory arguments\n"
+ " -t must be one of the test names - sink, transfer or ping\n"
+ " -i iteration count - the number of iterations to run the test over\n"
+ " Optional arguments\n"
+ " -S sysfs location - location for greybus 'endo' entires default /sys/bus/greybus/devices/\n"
+ " -D debugfs location - location for loopback debugfs entries default /sys/kernel/debug/gb_loopback/\n"
+ " -s size of data packet to send during test - defaults to zero\n"
+ " -m mask - a bit mask of connections to include example: -m 8 = 4th connection -m 9 = 1st and 4th connection etc\n"
+ " default is zero which means broadcast to all connections\n"
+ " -v verbose output\n"
+ " -d debug output\n"
+ " -r raw data output - when specified the full list of latency values are included in the output CSV\n"
+ " -p porcelain - when specified printout is in a user-friendly non-CSV format. This option suppresses writing to CSV file\n"
+ " -a aggregate - show aggregation of all enabled devices\n"
+ " -l list found loopback devices and exit\n"
+ " -x Async - Enable async transfers\n"
+ " -o Async Timeout - Timeout in uSec for async operations\n"
+ " -O Poll loop time out in seconds(max time a test is expected to last, default: 30sec)\n"
+ " -c Max number of outstanding operations for async operations\n"
+ " -w Wait in uSec between operations\n"
+ " -z Enable output to a CSV file (incompatible with -p)\n"
+ " -f When starting new loopback test, stop currently running tests on all devices\n"
+ "Examples:\n"
+ " Send 10000 transfers with a packet size of 128 bytes to all active connections\n"
+ " loopback_test -t transfer -s 128 -i 10000 -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n"
+ " loopback_test -t transfer -s 128 -i 10000 -m 0\n"
+ " Send 10000 transfers with a packet size of 128 bytes to connection 1 and 4\n"
+ " loopback_test -t transfer -s 128 -i 10000 -m 9\n"
+ " loopback_test -t ping -s 0 128 -i -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n"
+ " loopback_test -t sink -s 2030 -i 32768 -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n");
+ abort();
+}
+
+static inline int device_enabled(struct loopback_test *t, int dev_idx)
+{
+ if (!t->mask || (t->mask & (1 << dev_idx)))
+ return 1;
+
+ return 0;
+}
+
+static void show_loopback_devices(struct loopback_test *t)
+{
+ int i;
+
+ if (t->device_count == 0) {
+ printf("No loopback devices.\n");
+ return;
+ }
+
+ for (i = 0; i < t->device_count; i++)
+ printf("device[%d] = %s\n", i, t->devices[i].name);
+
+}
+
+int open_sysfs(const char *sys_pfx, const char *node, int flags)
+{
+ int fd;
+ char path[MAX_SYSFS_PATH];
+
+ snprintf(path, sizeof(path), "%s%s", sys_pfx, node);
+ fd = open(path, flags);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open %s\n", path);
+ abort();
+ }
+ return fd;
+}
+
+int read_sysfs_int_fd(int fd, const char *sys_pfx, const char *node)
+{
+ char buf[SYSFS_MAX_INT];
+
+ if (read(fd, buf, sizeof(buf)) < 0) {
+ fprintf(stderr, "unable to read from %s%s %s\n", sys_pfx, node,
+ strerror(errno));
+ close(fd);
+ abort();
+ }
+ return atoi(buf);
+}
+
+float read_sysfs_float_fd(int fd, const char *sys_pfx, const char *node)
+{
+ char buf[SYSFS_MAX_INT];
+
+ if (read(fd, buf, sizeof(buf)) < 0) {
+
+ fprintf(stderr, "unable to read from %s%s %s\n", sys_pfx, node,
+ strerror(errno));
+ close(fd);
+ abort();
+ }
+ return atof(buf);
+}
+
+int read_sysfs_int(const char *sys_pfx, const char *node)
+{
+ int fd, val;
+
+ fd = open_sysfs(sys_pfx, node, O_RDONLY);
+ val = read_sysfs_int_fd(fd, sys_pfx, node);
+ close(fd);
+ return val;
+}
+
+float read_sysfs_float(const char *sys_pfx, const char *node)
+{
+ int fd;
+ float val;
+
+ fd = open_sysfs(sys_pfx, node, O_RDONLY);
+ val = read_sysfs_float_fd(fd, sys_pfx, node);
+ close(fd);
+ return val;
+}
+
+void write_sysfs_val(const char *sys_pfx, const char *node, int val)
+{
+ int fd, len;
+ char buf[SYSFS_MAX_INT];
+
+ fd = open_sysfs(sys_pfx, node, O_RDWR);
+ len = snprintf(buf, sizeof(buf), "%d", val);
+ if (write(fd, buf, len) < 0) {
+ fprintf(stderr, "unable to write to %s%s %s\n", sys_pfx, node,
+ strerror(errno));
+ close(fd);
+ abort();
+ }
+ close(fd);
+}
+
+static int get_results(struct loopback_test *t)
+{
+ struct loopback_device *d;
+ struct loopback_results *r;
+ int i;
+
+ for (i = 0; i < t->device_count; i++) {
+ if (!device_enabled(t, i))
+ continue;
+
+ d = &t->devices[i];
+ r = &d->results;
+
+ r->error = read_sysfs_int(d->sysfs_entry, "error");
+ r->request_min = read_sysfs_int(d->sysfs_entry, "requests_per_second_min");
+ r->request_max = read_sysfs_int(d->sysfs_entry, "requests_per_second_max");
+ r->request_avg = read_sysfs_float(d->sysfs_entry, "requests_per_second_avg");
+
+ r->latency_min = read_sysfs_int(d->sysfs_entry, "latency_min");
+ r->latency_max = read_sysfs_int(d->sysfs_entry, "latency_max");
+ r->latency_avg = read_sysfs_float(d->sysfs_entry, "latency_avg");
+
+ r->throughput_min = read_sysfs_int(d->sysfs_entry, "throughput_min");
+ r->throughput_max = read_sysfs_int(d->sysfs_entry, "throughput_max");
+ r->throughput_avg = read_sysfs_float(d->sysfs_entry, "throughput_avg");
+
+ r->apbridge_unipro_latency_min =
+ read_sysfs_int(d->sysfs_entry, "apbridge_unipro_latency_min");
+ r->apbridge_unipro_latency_max =
+ read_sysfs_int(d->sysfs_entry, "apbridge_unipro_latency_max");
+ r->apbridge_unipro_latency_avg =
+ read_sysfs_float(d->sysfs_entry, "apbridge_unipro_latency_avg");
+
+ r->gbphy_firmware_latency_min =
+ read_sysfs_int(d->sysfs_entry, "gbphy_firmware_latency_min");
+ r->gbphy_firmware_latency_max =
+ read_sysfs_int(d->sysfs_entry, "gbphy_firmware_latency_max");
+ r->gbphy_firmware_latency_avg =
+ read_sysfs_float(d->sysfs_entry, "gbphy_firmware_latency_avg");
+
+ r->request_jitter = r->request_max - r->request_min;
+ r->latency_jitter = r->latency_max - r->latency_min;
+ r->throughput_jitter = r->throughput_max - r->throughput_min;
+ r->apbridge_unipro_latency_jitter =
+ r->apbridge_unipro_latency_max - r->apbridge_unipro_latency_min;
+ r->gbphy_firmware_latency_jitter =
+ r->gbphy_firmware_latency_max - r->gbphy_firmware_latency_min;
+
+ }
+
+ /*calculate the aggregate results of all enabled devices */
+ if (t->aggregate_output) {
+ r = &t->aggregate_results;
+
+ r->request_min = get_request_min_aggregate(t);
+ r->request_max = get_request_max_aggregate(t);
+ r->request_avg = get_request_avg_aggregate(t);
+
+ r->latency_min = get_latency_min_aggregate(t);
+ r->latency_max = get_latency_max_aggregate(t);
+ r->latency_avg = get_latency_avg_aggregate(t);
+
+ r->throughput_min = get_throughput_min_aggregate(t);
+ r->throughput_max = get_throughput_max_aggregate(t);
+ r->throughput_avg = get_throughput_avg_aggregate(t);
+
+ r->apbridge_unipro_latency_min =
+ get_apbridge_unipro_latency_min_aggregate(t);
+ r->apbridge_unipro_latency_max =
+ get_apbridge_unipro_latency_max_aggregate(t);
+ r->apbridge_unipro_latency_avg =
+ get_apbridge_unipro_latency_avg_aggregate(t);
+
+ r->gbphy_firmware_latency_min =
+ get_gbphy_firmware_latency_min_aggregate(t);
+ r->gbphy_firmware_latency_max =
+ get_gbphy_firmware_latency_max_aggregate(t);
+ r->gbphy_firmware_latency_avg =
+ get_gbphy_firmware_latency_avg_aggregate(t);
+
+ r->request_jitter = r->request_max - r->request_min;
+ r->latency_jitter = r->latency_max - r->latency_min;
+ r->throughput_jitter = r->throughput_max - r->throughput_min;
+ r->apbridge_unipro_latency_jitter =
+ r->apbridge_unipro_latency_max - r->apbridge_unipro_latency_min;
+ r->gbphy_firmware_latency_jitter =
+ r->gbphy_firmware_latency_max - r->gbphy_firmware_latency_min;
+
+ }
+
+ return 0;
+}
+
+void log_csv_error(int len, int err)
+{
+ fprintf(stderr, "unable to write %d bytes to csv %s\n", len,
+ strerror(err));
+}
+
+int format_output(struct loopback_test *t,
+ struct loopback_results *r,
+ const char *dev_name,
+ char *buf, int buf_len,
+ struct tm *tm)
+{
+ int len = 0;
+
+ memset(buf, 0x00, buf_len);
+ len = snprintf(buf, buf_len, "%u-%u-%u %u:%u:%u",
+ tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ if (t->porcelain) {
+ len += snprintf(&buf[len], buf_len - len,
+ "\n test:\t\t\t%s\n path:\t\t\t%s\n size:\t\t\t%u\n iterations:\t\t%u\n errors:\t\t%u\n async:\t\t\t%s\n",
+ t->test_name,
+ dev_name,
+ t->size,
+ t->iteration_max,
+ r->error,
+ t->use_async ? "Enabled" : "Disabled");
+
+ len += snprintf(&buf[len], buf_len - len,
+ " requests per-sec:\tmin=%u, max=%u, average=%f, jitter=%u\n",
+ r->request_min,
+ r->request_max,
+ r->request_avg,
+ r->request_jitter);
+
+ len += snprintf(&buf[len], buf_len - len,
+ " ap-throughput B/s:\tmin=%u max=%u average=%f jitter=%u\n",
+ r->throughput_min,
+ r->throughput_max,
+ r->throughput_avg,
+ r->throughput_jitter);
+ len += snprintf(&buf[len], buf_len - len,
+ " ap-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
+ r->latency_min,
+ r->latency_max,
+ r->latency_avg,
+ r->latency_jitter);
+ len += snprintf(&buf[len], buf_len - len,
+ " apbridge-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
+ r->apbridge_unipro_latency_min,
+ r->apbridge_unipro_latency_max,
+ r->apbridge_unipro_latency_avg,
+ r->apbridge_unipro_latency_jitter);
+
+ len += snprintf(&buf[len], buf_len - len,
+ " gbphy-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
+ r->gbphy_firmware_latency_min,
+ r->gbphy_firmware_latency_max,
+ r->gbphy_firmware_latency_avg,
+ r->gbphy_firmware_latency_jitter);
+
+ } else {
+ len += snprintf(&buf[len], buf_len- len, ",%s,%s,%u,%u,%u",
+ t->test_name, dev_name, t->size, t->iteration_max,
+ r->error);
+
+ len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
+ r->request_min,
+ r->request_max,
+ r->request_avg,
+ r->request_jitter);
+
+ len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
+ r->latency_min,
+ r->latency_max,
+ r->latency_avg,
+ r->latency_jitter);
+
+ len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
+ r->throughput_min,
+ r->throughput_max,
+ r->throughput_avg,
+ r->throughput_jitter);
+
+ len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
+ r->apbridge_unipro_latency_min,
+ r->apbridge_unipro_latency_max,
+ r->apbridge_unipro_latency_avg,
+ r->apbridge_unipro_latency_jitter);
+
+ len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
+ r->gbphy_firmware_latency_min,
+ r->gbphy_firmware_latency_max,
+ r->gbphy_firmware_latency_avg,
+ r->gbphy_firmware_latency_jitter);
+ }
+
+ printf("\n%s\n", buf);
+
+ return len;
+}
+
+static int log_results(struct loopback_test *t)
+{
+ int fd, i, len, ret;
+ struct tm tm;
+ time_t local_time;
+ mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+ char file_name[MAX_SYSFS_PATH];
+ char data[CSV_MAX_LINE];
+
+ local_time = time(NULL);
+ tm = *localtime(&local_time);
+
+ /*
+ * file name will test_name_size_iteration_max.csv
+ * every time the same test with the same parameters is run we will then
+ * append to the same CSV with datestamp - representing each test
+ * dataset.
+ */
+ if (t->file_output && !t->porcelain) {
+ snprintf(file_name, sizeof(file_name), "%s_%d_%d.csv",
+ t->test_name, t->size, t->iteration_max);
+
+ fd = open(file_name, O_WRONLY | O_CREAT | O_APPEND, mode);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open %s for appendation\n", file_name);
+ abort();
+ }
+
+ }
+ for (i = 0; i < t->device_count; i++) {
+ if (!device_enabled(t, i))
+ continue;
+
+ len = format_output(t, &t->devices[i].results,
+ t->devices[i].name,
+ data, sizeof(data), &tm);
+ if (t->file_output && !t->porcelain) {
+ ret = write(fd, data, len);
+ if (ret == -1)
+ fprintf(stderr, "unable to write %d bytes to csv.\n", len);
+ }
+
+ }
+
+
+ if (t->aggregate_output) {
+ len = format_output(t, &t->aggregate_results, "aggregate",
+ data, sizeof(data), &tm);
+ if (t->file_output && !t->porcelain) {
+ ret = write(fd, data, len);
+ if (ret == -1)
+ fprintf(stderr, "unable to write %d bytes to csv.\n", len);
+ }
+ }
+
+ if (t->file_output && !t->porcelain)
+ close(fd);
+
+ return 0;
+}
+
+int is_loopback_device(const char *path, const char *node)
+{
+ char file[MAX_SYSFS_PATH];
+
+ snprintf(file, MAX_SYSFS_PATH, "%s%s/iteration_count", path, node);
+ if (access(file, F_OK) == 0)
+ return 1;
+ return 0;
+}
+
+int find_loopback_devices(struct loopback_test *t)
+{
+ struct dirent **namelist;
+ int i, n, ret;
+ unsigned int dev_id;
+ struct loopback_device *d;
+
+ n = scandir(t->sysfs_prefix, &namelist, NULL, alphasort);
+ if (n < 0) {
+ perror("scandir");
+ ret = -ENODEV;
+ goto baddir;
+ }
+
+ /* Don't include '.' and '..' */
+ if (n <= 2) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ for (i = 0; i < n; i++) {
+ ret = sscanf(namelist[i]->d_name, "gb_loopback%u", &dev_id);
+ if (ret != 1)
+ continue;
+
+ if (!is_loopback_device(t->sysfs_prefix, namelist[i]->d_name))
+ continue;
+
+ if (t->device_count == MAX_NUM_DEVICES) {
+ fprintf(stderr, "max number of devices reached!\n");
+ break;
+ }
+
+ d = &t->devices[t->device_count++];
+ snprintf(d->name, MAX_STR_LEN, "gb_loopback%u", dev_id);
+
+ snprintf(d->sysfs_entry, MAX_SYSFS_PATH, "%s%s/",
+ t->sysfs_prefix, d->name);
+
+ snprintf(d->debugfs_entry, MAX_SYSFS_PATH, "%sraw_latency_%s",
+ t->debugfs_prefix, d->name);
+
+ if (t->debug)
+ printf("add %s %s\n", d->sysfs_entry,
+ d->debugfs_entry);
+ }
+
+ ret = 0;
+done:
+ for (i = 0; i < n; i++)
+ free(namelist[n]);
+ free(namelist);
+baddir:
+ return ret;
+}
+
+static int open_poll_files(struct loopback_test *t)
+{
+ struct loopback_device *dev;
+ char buf[MAX_STR_LEN];
+ char dummy;
+ int fds_idx = 0;
+ int i;
+
+ for (i = 0; i < t->device_count; i++) {
+ dev = &t->devices[i];
+
+ if (!device_enabled(t, i))
+ continue;
+
+ snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
+ t->fds[fds_idx].fd = open(buf, O_RDONLY);
+ if (t->fds[fds_idx].fd < 0) {
+ fprintf(stderr, "Error opening poll file!\n");
+ goto err;
+ }
+ read(t->fds[fds_idx].fd, &dummy, 1);
+ t->fds[fds_idx].events = POLLERR|POLLPRI;
+ t->fds[fds_idx].revents = 0;
+ fds_idx++;
+ }
+
+ t->poll_count = fds_idx;
+
+ return 0;
+
+err:
+ for (i = 0; i < fds_idx; i++)
+ close(t->fds[fds_idx].fd);
+
+ return -1;
+}
+
+static int close_poll_files(struct loopback_test *t)
+{
+ int i;
+ for (i = 0; i < t->poll_count; i++)
+ close(t->fds[i].fd);
+
+ return 0;
+}
+static int is_complete(struct loopback_test *t)
+{
+ int iteration_count;
+ int i;
+
+ for (i = 0; i < t->device_count; i++) {
+ if (!device_enabled(t, i))
+ continue;
+
+ iteration_count = read_sysfs_int(t->devices[i].sysfs_entry,
+ "iteration_count");
+
+ /* at least one device did not finish yet */
+ if (iteration_count != t->iteration_max)
+ return 0;
+ }
+
+ return 1;
+}
+
+static void stop_tests(struct loopback_test *t)
+{
+ int i;
+
+ for (i = 0; i < t->device_count; i++) {
+ if (!device_enabled(t, i))
+ continue;
+ write_sysfs_val(t->devices[i].sysfs_entry, "type", 0);
+ }
+}
+
+static void handler(int sig) { /* do nothing */ }
+
+static int wait_for_complete(struct loopback_test *t)
+{
+ int number_of_events = 0;
+ char dummy;
+ int ret;
+ int i;
+ struct timespec *ts = NULL;
+ struct sigaction sa;
+ sigset_t mask_old, mask;
+
+ sigemptyset(&mask);
+ sigemptyset(&mask_old);
+ sigaddset(&mask, SIGINT);
+ sigprocmask(SIG_BLOCK, &mask, &mask_old);
+
+ sa.sa_handler = handler;
+ sa.sa_flags = 0;
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(SIGINT, &sa, NULL) == -1) {
+ fprintf(stderr, "sigaction error\n");
+ return -1;
+ }
+
+ if (t->poll_timeout.tv_sec != 0)
+ ts = &t->poll_timeout;
+
+ while (1) {
+
+ ret = ppoll(t->fds, t->poll_count, ts, &mask_old);
+ if (ret <= 0) {
+ stop_tests(t);
+ fprintf(stderr, "Poll exit with errno %d\n", errno);
+ return -1;
+ }
+
+ for (i = 0; i < t->poll_count; i++) {
+ if (t->fds[i].revents & POLLPRI) {
+ /* Dummy read to clear the event */
+ read(t->fds[i].fd, &dummy, 1);
+ number_of_events++;
+ }
+ }
+
+ if (number_of_events == t->poll_count)
+ break;
+ }
+
+ if (!is_complete(t)) {
+ fprintf(stderr, "Iteration count did not finish!\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static void prepare_devices(struct loopback_test *t)
+{
+ int i;
+
+ /* Cancel any running tests on enabled devices. If
+ * stop_all option is given, stop test on all devices.
+ */
+ for (i = 0; i < t->device_count; i++)
+ if (t->stop_all || device_enabled(t, i))
+ write_sysfs_val(t->devices[i].sysfs_entry, "type", 0);
+
+
+ for (i = 0; i < t->device_count; i++) {
+ if (!device_enabled(t, i))
+ continue;
+
+ write_sysfs_val(t->devices[i].sysfs_entry, "us_wait",
+ t->us_wait);
+
+ /* Set operation size */
+ write_sysfs_val(t->devices[i].sysfs_entry, "size", t->size);
+
+ /* Set iterations */
+ write_sysfs_val(t->devices[i].sysfs_entry, "iteration_max",
+ t->iteration_max);
+
+ if (t->use_async) {
+ write_sysfs_val(t->devices[i].sysfs_entry,
+ "async", 1);
+ write_sysfs_val(t->devices[i].sysfs_entry,
+ "timeout", t->async_timeout);
+ write_sysfs_val(t->devices[i].sysfs_entry,
+ "outstanding_operations_max",
+ t->async_outstanding_operations);
+ } else
+ write_sysfs_val(t->devices[i].sysfs_entry,
+ "async", 0);
+ }
+}
+
+static int start(struct loopback_test *t)
+{
+ int i;
+
+ /* the test starts by writing test_id to the type file. */
+ for (i = 0; i < t->device_count; i++) {
+ if (!device_enabled(t, i))
+ continue;
+
+ write_sysfs_val(t->devices[i].sysfs_entry, "type", t->test_id);
+ }
+
+ return 0;
+}
+
+
+void loopback_run(struct loopback_test *t)
+{
+ int i;
+ int ret;
+
+ for (i = 0; dict[i].name != NULL; i++) {
+ if (strstr(dict[i].name, t->test_name))
+ t->test_id = dict[i].type;
+ }
+ if (!t->test_id) {
+ fprintf(stderr, "invalid test %s\n", t->test_name);
+ usage();
+ return;
+ }
+
+ prepare_devices(t);
+
+ ret = open_poll_files(t);
+ if (ret)
+ goto err;
+
+ start(t);
+
+ ret = wait_for_complete(t);
+ close_poll_files(t);
+ if (ret)
+ goto err;
+
+
+ get_results(t);
+
+ log_results(t);
+
+ return;
+
+err:
+ printf("Error running test\n");
+ return;
+}
+
+static int sanity_check(struct loopback_test *t)
+{
+ int i;
+
+ if (t->device_count == 0) {
+ fprintf(stderr, "No loopback devices found\n");
+ return -1;
+ }
+
+ for (i = 0; i < MAX_NUM_DEVICES; i++) {
+ if (!device_enabled(t, i))
+ continue;
+
+ if (t->mask && !strcmp(t->devices[i].name, "")) {
+ fprintf(stderr, "Bad device mask %x\n", (1 << i));
+ return -1;
+ }
+
+ }
+
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int o, ret;
+ char *sysfs_prefix = "/sys/class/gb_loopback/";
+ char *debugfs_prefix = "/sys/kernel/debug/gb_loopback/";
+
+ memset(&t, 0, sizeof(t));
+
+ while ((o = getopt(argc, argv,
+ "t:s:i:S:D:m:v::d::r::p::a::l::x::o:O:c:w:z::f::")) != -1) {
+ switch (o) {
+ case 't':
+ snprintf(t.test_name, MAX_STR_LEN, "%s", optarg);
+ break;
+ case 's':
+ t.size = atoi(optarg);
+ break;
+ case 'i':
+ t.iteration_max = atoi(optarg);
+ break;
+ case 'S':
+ snprintf(t.sysfs_prefix, MAX_SYSFS_PATH, "%s", optarg);
+ break;
+ case 'D':
+ snprintf(t.debugfs_prefix, MAX_SYSFS_PATH, "%s", optarg);
+ break;
+ case 'm':
+ t.mask = atol(optarg);
+ break;
+ case 'v':
+ t.verbose = 1;
+ break;
+ case 'd':
+ t.debug = 1;
+ break;
+ case 'r':
+ t.raw_data_dump = 1;
+ break;
+ case 'p':
+ t.porcelain = 1;
+ break;
+ case 'a':
+ t.aggregate_output = 1;
+ break;
+ case 'l':
+ t.list_devices = 1;
+ break;
+ case 'x':
+ t.use_async = 1;
+ break;
+ case 'o':
+ t.async_timeout = atoi(optarg);
+ break;
+ case 'O':
+ t.poll_timeout.tv_sec = atoi(optarg);
+ break;
+ case 'c':
+ t.async_outstanding_operations = atoi(optarg);
+ break;
+ case 'w':
+ t.us_wait = atoi(optarg);
+ break;
+ case 'z':
+ t.file_output = 1;
+ break;
+ case 'f':
+ t.stop_all = 1;
+ break;
+ default:
+ usage();
+ return -EINVAL;
+ }
+ }
+
+ if (!strcmp(t.sysfs_prefix, ""))
+ snprintf(t.sysfs_prefix, MAX_SYSFS_PATH, "%s", sysfs_prefix);
+
+ if (!strcmp(t.debugfs_prefix, ""))
+ snprintf(t.debugfs_prefix, MAX_SYSFS_PATH, "%s", debugfs_prefix);
+
+ ret = find_loopback_devices(&t);
+ if (ret)
+ return ret;
+ ret = sanity_check(&t);
+ if (ret)
+ return ret;
+
+ if (t.list_devices) {
+ show_loopback_devices(&t);
+ return 0;
+ }
+
+ if (t.test_name[0] == '\0' || t.iteration_max == 0)
+ usage();
+
+ if (t.async_timeout == 0)
+ t.async_timeout = DEFAULT_ASYNC_TIMEOUT;
+
+ loopback_run(&t);
+
+ return 0;
+}
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