1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Asynchronous Compression operations 4 * 5 * Copyright (c) 2016, Intel Corporation 6 * Authors: Weigang Li <weigang.li@intel.com> 7 * Giovanni Cabiddu <giovanni.cabiddu@intel.com> 8 */ 9 #ifndef _CRYPTO_ACOMP_H 10 #define _CRYPTO_ACOMP_H 11 #include <linux/crypto.h> 12 13 #define CRYPTO_ACOMP_ALLOC_OUTPUT 0x00000001 14 15 /** 16 * struct acomp_req - asynchronous (de)compression request 17 * 18 * @base: Common attributes for asynchronous crypto requests 19 * @src: Source Data 20 * @dst: Destination data 21 * @slen: Size of the input buffer 22 * @dlen: Size of the output buffer and number of bytes produced 23 * @flags: Internal flags 24 * @__ctx: Start of private context data 25 */ 26 struct acomp_req { 27 struct crypto_async_request base; 28 struct scatterlist *src; 29 struct scatterlist *dst; 30 unsigned int slen; 31 unsigned int dlen; 32 u32 flags; 33 void *__ctx[] CRYPTO_MINALIGN_ATTR; 34 }; 35 36 /** 37 * struct crypto_acomp - user-instantiated objects which encapsulate 38 * algorithms and core processing logic 39 * 40 * @compress: Function performs a compress operation 41 * @decompress: Function performs a de-compress operation 42 * @dst_free: Frees destination buffer if allocated inside the 43 * algorithm 44 * @reqsize: Context size for (de)compression requests 45 * @base: Common crypto API algorithm data structure 46 */ 47 struct crypto_acomp { 48 int (*compress)(struct acomp_req *req); 49 int (*decompress)(struct acomp_req *req); 50 void (*dst_free)(struct scatterlist *dst); 51 unsigned int reqsize; 52 struct crypto_tfm base; 53 }; 54 55 /** 56 * struct acomp_alg - asynchronous compression algorithm 57 * 58 * @compress: Function performs a compress operation 59 * @decompress: Function performs a de-compress operation 60 * @dst_free: Frees destination buffer if allocated inside the algorithm 61 * @init: Initialize the cryptographic transformation object. 62 * This function is used to initialize the cryptographic 63 * transformation object. This function is called only once at 64 * the instantiation time, right after the transformation context 65 * was allocated. In case the cryptographic hardware has some 66 * special requirements which need to be handled by software, this 67 * function shall check for the precise requirement of the 68 * transformation and put any software fallbacks in place. 69 * @exit: Deinitialize the cryptographic transformation object. This is a 70 * counterpart to @init, used to remove various changes set in 71 * @init. 72 * 73 * @reqsize: Context size for (de)compression requests 74 * @base: Common crypto API algorithm data structure 75 */ 76 struct acomp_alg { 77 int (*compress)(struct acomp_req *req); 78 int (*decompress)(struct acomp_req *req); 79 void (*dst_free)(struct scatterlist *dst); 80 int (*init)(struct crypto_acomp *tfm); 81 void (*exit)(struct crypto_acomp *tfm); 82 unsigned int reqsize; 83 struct crypto_alg base; 84 }; 85 86 /** 87 * DOC: Asynchronous Compression API 88 * 89 * The Asynchronous Compression API is used with the algorithms of type 90 * CRYPTO_ALG_TYPE_ACOMPRESS (listed as type "acomp" in /proc/crypto) 91 */ 92 93 /** 94 * crypto_alloc_acomp() -- allocate ACOMPRESS tfm handle 95 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the 96 * compression algorithm e.g. "deflate" 97 * @type: specifies the type of the algorithm 98 * @mask: specifies the mask for the algorithm 99 * 100 * Allocate a handle for a compression algorithm. The returned struct 101 * crypto_acomp is the handle that is required for any subsequent 102 * API invocation for the compression operations. 103 * 104 * Return: allocated handle in case of success; IS_ERR() is true in case 105 * of an error, PTR_ERR() returns the error code. 106 */ 107 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type, 108 u32 mask); 109 110 static inline struct crypto_tfm *crypto_acomp_tfm(struct crypto_acomp *tfm) 111 { 112 return &tfm->base; 113 } 114 115 static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg) 116 { 117 return container_of(alg, struct acomp_alg, base); 118 } 119 120 static inline struct crypto_acomp *__crypto_acomp_tfm(struct crypto_tfm *tfm) 121 { 122 return container_of(tfm, struct crypto_acomp, base); 123 } 124 125 static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm) 126 { 127 return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg); 128 } 129 130 static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm) 131 { 132 return tfm->reqsize; 133 } 134 135 static inline void acomp_request_set_tfm(struct acomp_req *req, 136 struct crypto_acomp *tfm) 137 { 138 req->base.tfm = crypto_acomp_tfm(tfm); 139 } 140 141 static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req) 142 { 143 return __crypto_acomp_tfm(req->base.tfm); 144 } 145 146 /** 147 * crypto_free_acomp() -- free ACOMPRESS tfm handle 148 * 149 * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp() 150 */ 151 static inline void crypto_free_acomp(struct crypto_acomp *tfm) 152 { 153 crypto_destroy_tfm(tfm, crypto_acomp_tfm(tfm)); 154 } 155 156 static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask) 157 { 158 type &= ~CRYPTO_ALG_TYPE_MASK; 159 type |= CRYPTO_ALG_TYPE_ACOMPRESS; 160 mask |= CRYPTO_ALG_TYPE_MASK; 161 162 return crypto_has_alg(alg_name, type, mask); 163 } 164 165 /** 166 * acomp_request_alloc() -- allocates asynchronous (de)compression request 167 * 168 * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp() 169 * 170 * Return: allocated handle in case of success or NULL in case of an error 171 */ 172 struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm); 173 174 /** 175 * acomp_request_free() -- zeroize and free asynchronous (de)compression 176 * request as well as the output buffer if allocated 177 * inside the algorithm 178 * 179 * @req: request to free 180 */ 181 void acomp_request_free(struct acomp_req *req); 182 183 /** 184 * acomp_request_set_callback() -- Sets an asynchronous callback 185 * 186 * Callback will be called when an asynchronous operation on a given 187 * request is finished. 188 * 189 * @req: request that the callback will be set for 190 * @flgs: specify for instance if the operation may backlog 191 * @cmlp: callback which will be called 192 * @data: private data used by the caller 193 */ 194 static inline void acomp_request_set_callback(struct acomp_req *req, 195 u32 flgs, 196 crypto_completion_t cmpl, 197 void *data) 198 { 199 req->base.complete = cmpl; 200 req->base.data = data; 201 req->base.flags = flgs; 202 } 203 204 /** 205 * acomp_request_set_params() -- Sets request parameters 206 * 207 * Sets parameters required by an acomp operation 208 * 209 * @req: asynchronous compress request 210 * @src: pointer to input buffer scatterlist 211 * @dst: pointer to output buffer scatterlist. If this is NULL, the 212 * acomp layer will allocate the output memory 213 * @slen: size of the input buffer 214 * @dlen: size of the output buffer. If dst is NULL, this can be used by 215 * the user to specify the maximum amount of memory to allocate 216 */ 217 static inline void acomp_request_set_params(struct acomp_req *req, 218 struct scatterlist *src, 219 struct scatterlist *dst, 220 unsigned int slen, 221 unsigned int dlen) 222 { 223 req->src = src; 224 req->dst = dst; 225 req->slen = slen; 226 req->dlen = dlen; 227 228 if (!req->dst) 229 req->flags |= CRYPTO_ACOMP_ALLOC_OUTPUT; 230 } 231 232 /** 233 * crypto_acomp_compress() -- Invoke asynchronous compress operation 234 * 235 * Function invokes the asynchronous compress operation 236 * 237 * @req: asynchronous compress request 238 * 239 * Return: zero on success; error code in case of error 240 */ 241 static inline int crypto_acomp_compress(struct acomp_req *req) 242 { 243 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req); 244 struct crypto_alg *alg = tfm->base.__crt_alg; 245 unsigned int slen = req->slen; 246 int ret; 247 248 crypto_stats_get(alg); 249 ret = tfm->compress(req); 250 crypto_stats_compress(slen, ret, alg); 251 return ret; 252 } 253 254 /** 255 * crypto_acomp_decompress() -- Invoke asynchronous decompress operation 256 * 257 * Function invokes the asynchronous decompress operation 258 * 259 * @req: asynchronous compress request 260 * 261 * Return: zero on success; error code in case of error 262 */ 263 static inline int crypto_acomp_decompress(struct acomp_req *req) 264 { 265 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req); 266 struct crypto_alg *alg = tfm->base.__crt_alg; 267 unsigned int slen = req->slen; 268 int ret; 269 270 crypto_stats_get(alg); 271 ret = tfm->decompress(req); 272 crypto_stats_decompress(slen, ret, alg); 273 return ret; 274 } 275 276 #endif 277