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37 #include "../../include/linux/libcfs/libcfs.h"
38 #include "../../include/linux/libcfs/libcfs_crypto.h"
39 #include "lustre/lustre_idl.h"
41 static inline unsigned char cksum_obd2cfs(enum cksum_type cksum_type)
45 return CFS_HASH_ALG_CRC32;
47 return CFS_HASH_ALG_ADLER32;
48 case OBD_CKSUM_CRC32C:
49 return CFS_HASH_ALG_CRC32C;
51 CERROR("Unknown checksum type (%x)!!!\n", cksum_type);
57 /* The OBD_FL_CKSUM_* flags is packed into 5 bits of o_flags, since there can
58 * only be a single checksum type per RPC.
60 * The OBD_CHECKSUM_* type bits passed in ocd_cksum_types are a 32-bit bitmask
61 * since they need to represent the full range of checksum algorithms that
62 * both the client and server can understand.
64 * In case of an unsupported types/flags we fall back to ADLER
65 * because that is supported by all clients since 1.8
67 * In case multiple algorithms are supported the best one is used.
69 static inline u32 cksum_type_pack(enum cksum_type cksum_type)
71 unsigned int performance = 0, tmp;
72 u32 flag = OBD_FL_CKSUM_ADLER;
74 if (cksum_type & OBD_CKSUM_CRC32) {
75 tmp = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32));
76 if (tmp > performance) {
78 flag = OBD_FL_CKSUM_CRC32;
81 if (cksum_type & OBD_CKSUM_CRC32C) {
82 tmp = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C));
83 if (tmp > performance) {
85 flag = OBD_FL_CKSUM_CRC32C;
88 if (cksum_type & OBD_CKSUM_ADLER) {
89 tmp = cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_ADLER));
90 if (tmp > performance) {
92 flag = OBD_FL_CKSUM_ADLER;
95 if (unlikely(cksum_type && !(cksum_type & (OBD_CKSUM_CRC32C |
98 CWARN("unknown cksum type %x\n", cksum_type);
103 static inline enum cksum_type cksum_type_unpack(u32 o_flags)
105 switch (o_flags & OBD_FL_CKSUM_ALL) {
106 case OBD_FL_CKSUM_CRC32C:
107 return OBD_CKSUM_CRC32C;
108 case OBD_FL_CKSUM_CRC32:
109 return OBD_CKSUM_CRC32;
114 return OBD_CKSUM_ADLER;
117 /* Return a bitmask of the checksum types supported on this system.
118 * 1.8 supported ADLER it is base and not depend on hw
119 * Client uses all available local algos
121 static inline enum cksum_type cksum_types_supported_client(void)
123 enum cksum_type ret = OBD_CKSUM_ADLER;
125 CDEBUG(D_INFO, "Crypto hash speed: crc %d, crc32c %d, adler %d\n",
126 cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32)),
127 cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C)),
128 cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_ADLER)));
130 if (cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32C)) > 0)
131 ret |= OBD_CKSUM_CRC32C;
132 if (cfs_crypto_hash_speed(cksum_obd2cfs(OBD_CKSUM_CRC32)) > 0)
133 ret |= OBD_CKSUM_CRC32;
138 /* Select the best checksum algorithm among those supplied in the cksum_types
141 * Currently, calling cksum_type_pack() with a mask will return the fastest
142 * checksum type due to its benchmarking at libcfs module load.
143 * Caution is advised, however, since what is fastest on a single client may
144 * not be the fastest or most efficient algorithm on the server.
146 static inline enum cksum_type cksum_type_select(enum cksum_type cksum_types)
148 return cksum_type_unpack(cksum_type_pack(cksum_types));
151 /* Checksum algorithm names. Must be defined in the same order as the
154 #define DECLARE_CKSUM_NAME char *cksum_name[] = {"crc32", "adler", "crc32c"}