1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/crc32.h b/drivers/net/ethernet/netronome/nfp/nfpcore/crc32.h
new file mode 100644
index 000000000..6ad43c7ce
--- /dev/null
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/crc32.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/* Copyright (C) 2015-2017 Netronome Systems, Inc. */
+
+#ifndef NFP_CRC32_H
+#define NFP_CRC32_H
+
+#include <linux/crc32.h>
+
+/**
+ * crc32_posix_end() - Finalize POSIX CRC32 working state
+ * @crc:	Current CRC32 working state
+ * @total_len:	Total length of data that was CRC32'd
+ *
+ * Return: Final POSIX CRC32 value
+ */
+static inline u32 crc32_posix_end(u32 crc, size_t total_len)
+{
+	/* Extend with the length of the string. */
+	while (total_len != 0) {
+		u8 c = total_len & 0xff;
+
+		crc = crc32_be(crc, &c, 1);
+		total_len >>= 8;
+	}
+
+	return ~crc;
+}
+
+static inline u32 crc32_posix(const void *buff, size_t len)
+{
+	return crc32_posix_end(crc32_be(0, buff, len), len);
+}
+
+#endif /* NFP_CRC32_H */