[linux] Add xxhash and zstd in-kernel tests
This commit is contained in:
Nick Terrell
@@ -0,0 +1,191 @@
|
||||
/*
|
||||
* Copyright (c) 2016-present, Facebook, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This source code is licensed under the BSD-style license found in the
|
||||
* LICENSE file in the root directory of this source tree. An additional grant
|
||||
* of patent rights can be found in the PATENTS file in the same directory.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it under
|
||||
* the terms of the GNU General Public License version 2 as published by the
|
||||
* Free Software Foundation. This program is dual-licensed; you may select
|
||||
* either version 2 of the GNU General Public License ("GPL") or BSD license
|
||||
* ("BSD").
|
||||
*/
|
||||
|
||||
/* DO_XXH should be 32 or 64 for xxh32 and xxh64 respectively */
|
||||
#define DO_XXH 0
|
||||
/* DO_CRC should be 0 or 1 */
|
||||
#define DO_CRC 0
|
||||
/* Buffer size */
|
||||
#define BUFFER_SIZE 4096
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
#if DO_XXH
|
||||
#include <linux/xxhash.h>
|
||||
#endif
|
||||
|
||||
#if DO_CRC
|
||||
#include <linux/crc32.h>
|
||||
#endif
|
||||
|
||||
/* Device name to pass to register_chrdev(). */
|
||||
#define DEVICE_NAME "xxhash_test"
|
||||
|
||||
/* Dynamically allocated device major number */
|
||||
static int device_major;
|
||||
|
||||
/*
|
||||
* We reuse the same hash state, and thus can hash only one
|
||||
* file at a time.
|
||||
*/
|
||||
static bool device_is_open;
|
||||
|
||||
static uint64_t total_length;
|
||||
|
||||
|
||||
#if (DO_XXH == 32)
|
||||
|
||||
#define xxh_state xxh32_state
|
||||
#define xxh_reset xxh32_reset
|
||||
#define xxh_update xxh32_update
|
||||
#define xxh_digest xxh32_digest
|
||||
#define XXH_FORMAT "XXH32 = 0x%x"
|
||||
|
||||
#elif (DO_XXH == 64)
|
||||
|
||||
#define xxh_state xxh64_state
|
||||
#define xxh_reset xxh64_reset
|
||||
#define xxh_update xxh64_update
|
||||
#define xxh_digest xxh64_digest
|
||||
#define XXH_FORMAT "XXH64 = 0x%llx"
|
||||
|
||||
#elif DO_XXH
|
||||
|
||||
#error "Invalid value of DO_XXH"
|
||||
|
||||
#endif
|
||||
|
||||
#if DO_XXH
|
||||
|
||||
/* XXH state */
|
||||
static struct xxh_state state;
|
||||
|
||||
#endif /* DO_XXH */
|
||||
|
||||
#if DO_CRC
|
||||
|
||||
static uint32_t crc;
|
||||
|
||||
#endif /* DO_CRC */
|
||||
|
||||
/*
|
||||
* Input buffer used to put data coming from userspace.
|
||||
*/
|
||||
static uint8_t buffer_in[BUFFER_SIZE];
|
||||
|
||||
static int xxhash_test_open(struct inode *i, struct file *f)
|
||||
{
|
||||
if (device_is_open)
|
||||
return -EBUSY;
|
||||
|
||||
device_is_open = true;
|
||||
|
||||
total_length = 0;
|
||||
#if DO_XXH
|
||||
xxh_reset(&state, 0);
|
||||
#endif
|
||||
#if DO_CRC
|
||||
crc = 0xFFFFFFFF;
|
||||
#endif
|
||||
|
||||
printk(KERN_INFO DEVICE_NAME ": opened\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xxhash_test_release(struct inode *i, struct file *f)
|
||||
{
|
||||
device_is_open = false;
|
||||
|
||||
printk(KERN_INFO DEVICE_NAME ": total_len = %llu\n", total_length);
|
||||
#if DO_XXH
|
||||
printk(KERN_INFO DEVICE_NAME ": " XXH_FORMAT "\n", xxh_digest(&state));
|
||||
#endif
|
||||
#if DO_CRC
|
||||
printk(KERN_INFO DEVICE_NAME ": CRC32 = 0x%08x\n", ~crc);
|
||||
#endif
|
||||
printk(KERN_INFO DEVICE_NAME ": closed\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Hash the data given to us from userspace.
|
||||
*/
|
||||
static ssize_t xxhash_test_write(struct file *file, const char __user *buf,
|
||||
size_t size, loff_t *pos)
|
||||
{
|
||||
size_t remaining = size;
|
||||
|
||||
while (remaining > 0) {
|
||||
#if DO_XXH
|
||||
int ret;
|
||||
#endif
|
||||
size_t const copy_size = min(remaining, sizeof(buffer_in));
|
||||
|
||||
if (copy_from_user(buffer_in, buf, copy_size))
|
||||
return -EFAULT;
|
||||
buf += copy_size;
|
||||
remaining -= copy_size;
|
||||
total_length += copy_size;
|
||||
#if DO_XXH
|
||||
if ((ret = xxh_update(&state, buffer_in, copy_size))) {
|
||||
printk(KERN_INFO DEVICE_NAME ": xxh failure.");
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
#if DO_CRC
|
||||
crc = crc32(crc, buffer_in, copy_size);
|
||||
#endif
|
||||
}
|
||||
return size;
|
||||
}
|
||||
/* register the character device. */
|
||||
static int __init xxhash_test_init(void)
|
||||
{
|
||||
static const struct file_operations fileops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = &xxhash_test_open,
|
||||
.release = &xxhash_test_release,
|
||||
.write = &xxhash_test_write
|
||||
};
|
||||
|
||||
device_major = register_chrdev(0, DEVICE_NAME, &fileops);
|
||||
if (device_major < 0) {
|
||||
return device_major;
|
||||
}
|
||||
|
||||
printk(KERN_INFO DEVICE_NAME ": module loaded\n");
|
||||
printk(KERN_INFO DEVICE_NAME ": Create a device node with "
|
||||
"'mknod " DEVICE_NAME " c %d 0' and write data "
|
||||
"to it.\n", device_major);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit xxhash_test_exit(void)
|
||||
{
|
||||
unregister_chrdev(device_major, DEVICE_NAME);
|
||||
printk(KERN_INFO DEVICE_NAME ": module unloaded\n");
|
||||
}
|
||||
|
||||
module_init(xxhash_test_init);
|
||||
module_exit(xxhash_test_exit);
|
||||
|
||||
MODULE_DESCRIPTION("XXHash tester");
|
||||
MODULE_VERSION("1.0");
|
||||
|
||||
|
||||
MODULE_LICENSE("Dual BSD/GPL");
|
||||
Reference in New Issue
Block a user