LU-1339 libcfs: add crc32 pclmulqdq implementation

[fs/lustre-release.git] / libcfs / libcfs / user-crypto.c

diff --git a/libcfs/libcfs/user-crypto.c b/libcfs/libcfs/user-crypto.c
index 66d0bae..9ae5aa9 100644 (file)
--- a/libcfs/libcfs/user-crypto.c
+++ b/libcfs/libcfs/user-crypto.c
@@ -31,6 +31,7 @@
 
 #include <libcfs/libcfs.h>
 #include <libcfs/posix/posix-crypto.h>
+#include <libcfs/user-crypto.h>
 
 static int cfs_crypto_hash_speeds[CFS_HASH_ALG_MAX];
 
@@ -89,8 +90,21 @@ static int adler_wrapper(void *ctx, const unsigned char *p,
        return 0;
 }
 
+#if (defined i386) || (defined __amd64__)
+static int crc32_pclmul_wrapper(void *ctx, const unsigned char *p,
+                               unsigned int len)
+{
+       unsigned int cksum = *(unsigned int *)ctx;
+
+       cksum = crc32_pclmul_le(cksum, p, len);
+
+       *(unsigned int *)ctx = cksum;
+       return 0;
+}
+#endif
+
 static int start_generic(void *ctx, unsigned char *key,
-                                        unsigned int key_len)
+                        unsigned int key_len)
 {
        const struct cfs_crypto_hash_type       *type;
        struct hash_desc        *hd = container_of(ctx, struct hash_desc,
@@ -111,7 +125,7 @@ static int start_generic(void *ctx, unsigned char *key,
 }
 
 static int final_generic(void *ctx, unsigned char *hash,
-                                        unsigned int hash_len)
+                        unsigned int hash_len)
 {
        const struct cfs_crypto_hash_type       *type;
        struct hash_desc        *hd = container_of(ctx, struct hash_desc,
@@ -142,7 +156,18 @@ static struct __hash_alg crypto_hash[] = {
                                           .update = adler_wrapper,
                                           .start = start_generic,
                                           .final = final_generic,
-                                          .fini = NULL} };
+                                          .fini = NULL},
+#if (defined i386) || (defined __amd64__)
+                                         {.ha_id = CFS_HASH_ALG_CRC32,
+                                          .ha_ctx_size = sizeof(unsigned int),
+                                          .ha_priority = 100,
+                                          .init = crc32_pclmul_init,
+                                          .update = crc32_pclmul_wrapper,
+                                          .start = start_generic,
+                                          .final = final_generic,
+                                          .fini = NULL},
+#endif
+                                       };
 
 /**
  * Go through hashes to find the hash with  max priority