first commit

1 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/crc32.h b/include/linux/crc32.h
new file mode 100644
index 000000000..68267b64b
--- /dev/null
+++ b/include/linux/crc32.h
@@ -0,0 +1,29 @@
+/*
+ * crc32.h
+ * See linux/lib/crc32.c for license and changes
+ */
+#ifndef _LINUX_CRC32_H
+#define _LINUX_CRC32_H
+
+#include <linux/types.h>
+#include <linux/bitrev.h>
+
+extern u32  crc32_le(u32 crc, unsigned char const *p, size_t len);
+extern u32  crc32_be(u32 crc, unsigned char const *p, size_t len);
+
+extern u32  __crc32c_le(u32 crc, unsigned char const *p, size_t len);
+
+#define crc32(seed, data, length)  crc32_le(seed, (unsigned char const *)(data), length)
+
+/*
+ * Helpers for hash table generation of ethernet nics:
+ *
+ * Ethernet sends the least significant bit of a byte first, thus crc32_le
+ * is used. The output of crc32_le is bit reversed [most significant bit
+ * is in bit nr 0], thus it must be reversed before use. Except for
+ * nics that bit swap the result internally...
+ */
+#define ether_crc(length, data)    bitrev32(crc32_le(~0, data, length))
+#define ether_crc_le(length, data) crc32_le(~0, data, length)
+
+#endif /* _LINUX_CRC32_H */