LCOV - code coverage report
Current view: top level - include/crypto - acompress.h (source / functions) Hit Total Coverage
Test: Real Lines: 0 6 0.0 %
Date: 2020-10-17 15:46:16 Functions: 0 0 -
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       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                 :          0 :         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                 :          0 :         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                 :          0 :         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                 :          0 :         return tfm->reqsize;
     133                 :            : }
     134                 :            : 
     135                 :            : static inline void acomp_request_set_tfm(struct acomp_req *req,
     136                 :            :                                          struct crypto_acomp *tfm)
     137                 :            : {
     138                 :          0 :         req->base.tfm = crypto_acomp_tfm(tfm);
     139                 :            : }
     140                 :            : 
     141                 :            : static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
     142                 :            : {
     143                 :          0 :         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
    

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