include/crypto/acompress.h

   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