New upstream version 18.05

[deb_dpdk.git] / drivers / net / nfp / nfpcore / nfp_crc.c

diff --git a/drivers/net/nfp/nfpcore/nfp_crc.c b/drivers/net/nfp/nfpcore/nfp_crc.c
new file mode 100644 (file)
index 0000000..20431bf
--- /dev/null
+++ b/drivers/net/nfp/nfpcore/nfp_crc.c
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2018 Netronome Systems, Inc.
+ * All rights reserved.
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "nfp_crc.h"
+
+static inline uint32_t
+nfp_crc32_be_generic(uint32_t crc, unsigned char const *p, size_t len,
+                uint32_t polynomial)
+{
+       int i;
+       while (len--) {
+               crc ^= *p++ << 24;
+               for (i = 0; i < 8; i++)
+                       crc = (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
+                                         0);
+       }
+       return crc;
+}
+
+static inline uint32_t
+nfp_crc32_be(uint32_t crc, unsigned char const *p, size_t len)
+{
+       return nfp_crc32_be_generic(crc, p, len, CRCPOLY_BE);
+}
+
+static uint32_t
+nfp_crc32_posix_end(uint32_t crc, size_t total_len)
+{
+       /* Extend with the length of the string. */
+       while (total_len != 0) {
+               uint8_t c = total_len & 0xff;
+
+               crc = nfp_crc32_be(crc, &c, 1);
+               total_len >>= 8;
+       }
+
+       return ~crc;
+}
+
+uint32_t
+nfp_crc32_posix(const void *buff, size_t len)
+{
+       return nfp_crc32_posix_end(nfp_crc32_be(0, buff, len), len);
+}