Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 185 insertions, 0 deletions

diff --git a/src/zstd/contrib/linux-kernel/xxhash_test.c b/src/zstd/contrib/linux-kernel/xxhash_test.c
new file mode 100644
index 00000000..eb0fb1cd
--- /dev/null
+++ b/src/zstd/contrib/linux-kernel/xxhash_test.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ */
+
+/* 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");