include/crypto/acompress.h - linux - Git at Google

 /*
  * Asynchronous Compression operations
  *
  * Copyright (c) 2016, Intel Corporation
  * Authors: Weigang Li <weigang.li@intel.com>
  *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
  */
 #ifndef _CRYPTO_ACOMP_H
 #define _CRYPTO_ACOMP_H
 #include <linux/crypto.h>

 #define CRYPTO_ACOMP_ALLOC_OUTPUT	0x00000001

 /**
  * struct acomp_req - asynchronous (de)compression request
  *
  * @base:	Common attributes for asynchronous crypto requests
  * @src:	Source Data
  * @dst:	Destination data
  * @slen:	Size of the input buffer
  * @dlen:	Size of the output buffer and number of bytes produced
  * @flags:	Internal flags
  * @__ctx:	Start of private context data
  */
 struct acomp_req {
 	struct crypto_async_request base;
 	struct scatterlist *src;
 	struct scatterlist *dst;
 	unsigned int slen;
 	unsigned int dlen;
 	u32 flags;
 	void *__ctx[] CRYPTO_MINALIGN_ATTR;
 };

 /**
  * struct crypto_acomp - user-instantiated objects which encapsulate
  * algorithms and core processing logic
  *
  * @compress:		Function performs a compress operation
  * @decompress:		Function performs a de-compress operation
  * @dst_free:		Frees destination buffer if allocated inside the
  *			algorithm
  * @reqsize:		Context size for (de)compression requests
  * @base:		Common crypto API algorithm data structure
  */
 struct crypto_acomp {
 	int (*compress)(struct acomp_req *req);
 	int (*decompress)(struct acomp_req *req);
 	void (*dst_free)(struct scatterlist *dst);
 	unsigned int reqsize;
 	struct crypto_tfm base;
 };

 /**
  * struct acomp_alg - asynchronous compression algorithm
  *
  * @compress:	Function performs a compress operation
  * @decompress:	Function performs a de-compress operation
  * @dst_free:	Frees destination buffer if allocated inside the algorithm
  * @init:	Initialize the cryptographic transformation object.
  *		This function is used to initialize the cryptographic
  *		transformation object. This function is called only once at
  *		the instantiation time, right after the transformation context
  *		was allocated. In case the cryptographic hardware has some
  *		special requirements which need to be handled by software, this
  *		function shall check for the precise requirement of the
  *		transformation and put any software fallbacks in place.
  * @exit:	Deinitialize the cryptographic transformation object. This is a
  *		counterpart to @init, used to remove various changes set in
  *		@init.
  *
  * @reqsize:	Context size for (de)compression requests
  * @base:	Common crypto API algorithm data structure
  */
 struct acomp_alg {
 	int (*compress)(struct acomp_req *req);
 	int (*decompress)(struct acomp_req *req);
 	void (*dst_free)(struct scatterlist *dst);
 	int (*init)(struct crypto_acomp *tfm);
 	void (*exit)(struct crypto_acomp *tfm);
 	unsigned int reqsize;
 	struct crypto_alg base;
 };

 /**
  * DOC: Asynchronous Compression API
  *
  * The Asynchronous Compression API is used with the algorithms of type
  * CRYPTO_ALG_TYPE_ACOMPRESS (listed as type "acomp" in /proc/crypto)
  */

 /**
  * crypto_alloc_acomp() -- allocate ACOMPRESS tfm handle
  * @alg_name:	is the cra_name / name or cra_driver_name / driver name of the
  *		compression algorithm e.g. "deflate"
  * @type:	specifies the type of the algorithm
  * @mask:	specifies the mask for the algorithm
  *
  * Allocate a handle for a compression algorithm. The returned struct
  * crypto_acomp is the handle that is required for any subsequent
  * API invocation for the compression operations.
  *
  * Return:	allocated handle in case of success; IS_ERR() is true in case
  *		of an error, PTR_ERR() returns the error code.
  */
 struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
 					u32 mask);

 static inline struct crypto_tfm *crypto_acomp_tfm(struct crypto_acomp *tfm)
 {
 	return &tfm->base;
 }

 static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
 {
 	return container_of(alg, struct acomp_alg, base);
 }

 static inline struct crypto_acomp *__crypto_acomp_tfm(struct crypto_tfm *tfm)
 {
 	return container_of(tfm, struct crypto_acomp, base);
 }

 static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
 {
 	return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
 }

 static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
 {
 	return tfm->reqsize;
 }

 static inline void acomp_request_set_tfm(struct acomp_req *req,
 					 struct crypto_acomp *tfm)
 {
 	req->base.tfm = crypto_acomp_tfm(tfm);
 }

 static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
 {
 	return __crypto_acomp_tfm(req->base.tfm);
 }

 /**
  * crypto_free_acomp() -- free ACOMPRESS tfm handle
  *
  * @tfm:	ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
  */
 static inline void crypto_free_acomp(struct crypto_acomp *tfm)
 {
 	crypto_destroy_tfm(tfm, crypto_acomp_tfm(tfm));
 }

 static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask)
 {
 	type &= ~CRYPTO_ALG_TYPE_MASK;
 	type |= CRYPTO_ALG_TYPE_ACOMPRESS;
 	mask |= CRYPTO_ALG_TYPE_MASK;

 	return crypto_has_alg(alg_name, type, mask);
 }

 /**
  * acomp_request_alloc() -- allocates asynchronous (de)compression request
  *
  * @tfm:	ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
  *
  * Return:	allocated handle in case of success or NULL in case of an error
  */
 struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm);

 /**
  * acomp_request_free() -- zeroize and free asynchronous (de)compression
  *			   request as well as the output buffer if allocated
  *			   inside the algorithm
  *
  * @req:	request to free
  */
 void acomp_request_free(struct acomp_req *req);

 /**
  * acomp_request_set_callback() -- Sets an asynchronous callback
  *
  * Callback will be called when an asynchronous operation on a given
  * request is finished.
  *
  * @req:	request that the callback will be set for
  * @flgs:	specify for instance if the operation may backlog
  * @cmlp:	callback which will be called
  * @data:	private data used by the caller
  */
 static inline void acomp_request_set_callback(struct acomp_req *req,
 					      u32 flgs,
 					      crypto_completion_t cmpl,
 					      void *data)
 {
 	req->base.complete = cmpl;
 	req->base.data = data;
 	req->base.flags = flgs;
 }

 /**
  * acomp_request_set_params() -- Sets request parameters
  *
  * Sets parameters required by an acomp operation
  *
  * @req:	asynchronous compress request
  * @src:	pointer to input buffer scatterlist
  * @dst:	pointer to output buffer scatterlist. If this is NULL, the
  *		acomp layer will allocate the output memory
  * @slen:	size of the input buffer
  * @dlen:	size of the output buffer. If dst is NULL, this can be used by
  *		the user to specify the maximum amount of memory to allocate
  */
 static inline void acomp_request_set_params(struct acomp_req *req,
 					    struct scatterlist *src,
 					    struct scatterlist *dst,
 					    unsigned int slen,
 					    unsigned int dlen)
 {
 	req->src = src;
 	req->dst = dst;
 	req->slen = slen;
 	req->dlen = dlen;

 	if (!req->dst)
 		req->flags |= CRYPTO_ACOMP_ALLOC_OUTPUT;
 }

 /**
  * crypto_acomp_compress() -- Invoke asynchronous compress operation
  *
  * Function invokes the asynchronous compress operation
  *
  * @req:	asynchronous compress request
  *
  * Return:	zero on success; error code in case of error
  */
 static inline int crypto_acomp_compress(struct acomp_req *req)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
 	struct crypto_alg *alg = tfm->base.__crt_alg;
 	unsigned int slen = req->slen;
 	int ret;

 	crypto_stats_get(alg);
 	ret = tfm->compress(req);
 	crypto_stats_compress(slen, ret, alg);
 	return ret;
 }

 /**
  * crypto_acomp_decompress() -- Invoke asynchronous decompress operation
  *
  * Function invokes the asynchronous decompress operation
  *
  * @req:	asynchronous compress request
  *
  * Return:	zero on success; error code in case of error
  */
 static inline int crypto_acomp_decompress(struct acomp_req *req)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
 	struct crypto_alg *alg = tfm->base.__crt_alg;
 	unsigned int slen = req->slen;
 	int ret;

 	crypto_stats_get(alg);
 	ret = tfm->decompress(req);
 	crypto_stats_decompress(slen, ret, alg);
 	return ret;
 }

 #endif
	/*
	* Asynchronous Compression operations
	*
	* Copyright (c) 2016, Intel Corporation
	* Authors: Weigang Li <weigang.li@intel.com>
	* Giovanni Cabiddu <giovanni.cabiddu@intel.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the Free
	* Software Foundation; either version 2 of the License, or (at your option)
	* any later version.
	*
	*/
	#ifndef _CRYPTO_ACOMP_H
	#define _CRYPTO_ACOMP_H
	#include <linux/crypto.h>

	#define CRYPTO_ACOMP_ALLOC_OUTPUT 0x00000001

	/**
	* struct acomp_req - asynchronous (de)compression request
	*
	* @base: Common attributes for asynchronous crypto requests
	* @src: Source Data
	* @dst: Destination data
	* @slen: Size of the input buffer
	* @dlen: Size of the output buffer and number of bytes produced
	* @flags: Internal flags
	* @__ctx: Start of private context data
	*/
	struct acomp_req {
	struct crypto_async_request base;
	struct scatterlist *src;
	struct scatterlist *dst;
	unsigned int slen;
	unsigned int dlen;
	u32 flags;
	void *__ctx[] CRYPTO_MINALIGN_ATTR;
	};

	/**
	* struct crypto_acomp - user-instantiated objects which encapsulate
	* algorithms and core processing logic
	*
	* @compress: Function performs a compress operation
	* @decompress: Function performs a de-compress operation
	* @dst_free: Frees destination buffer if allocated inside the
	* algorithm
	* @reqsize: Context size for (de)compression requests
	* @base: Common crypto API algorithm data structure
	*/
	struct crypto_acomp {
	int (compress)(struct acomp_req req);
	int (decompress)(struct acomp_req req);
	void (dst_free)(struct scatterlist dst);
	unsigned int reqsize;
	struct crypto_tfm base;
	};

	/**
	* struct acomp_alg - asynchronous compression algorithm
	*
	* @compress: Function performs a compress operation
	* @decompress: Function performs a de-compress operation
	* @dst_free: Frees destination buffer if allocated inside the algorithm
	* @init: Initialize the cryptographic transformation object.
	* This function is used to initialize the cryptographic
	* transformation object. This function is called only once at
	* the instantiation time, right after the transformation context
	* was allocated. In case the cryptographic hardware has some
	* special requirements which need to be handled by software, this
	* function shall check for the precise requirement of the
	* transformation and put any software fallbacks in place.
	* @exit: Deinitialize the cryptographic transformation object. This is a
	* counterpart to @init, used to remove various changes set in
	* @init.
	*
	* @reqsize: Context size for (de)compression requests
	* @base: Common crypto API algorithm data structure
	*/
	struct acomp_alg {
	int (compress)(struct acomp_req req);
	int (decompress)(struct acomp_req req);
	void (dst_free)(struct scatterlist dst);
	int (init)(struct crypto_acomp tfm);
	void (exit)(struct crypto_acomp tfm);
	unsigned int reqsize;
	struct crypto_alg base;
	};

	/**
	* DOC: Asynchronous Compression API
	*
	* The Asynchronous Compression API is used with the algorithms of type
	* CRYPTO_ALG_TYPE_ACOMPRESS (listed as type "acomp" in /proc/crypto)
	*/

	/**
	* crypto_alloc_acomp() -- allocate ACOMPRESS tfm handle
	* @alg_name: is the cra_name / name or cra_driver_name / driver name of the
	* compression algorithm e.g. "deflate"
	* @type: specifies the type of the algorithm
	* @mask: specifies the mask for the algorithm
	*
	* Allocate a handle for a compression algorithm. The returned struct
	* crypto_acomp is the handle that is required for any subsequent
	* API invocation for the compression operations.
	*
	* Return: allocated handle in case of success; IS_ERR() is true in case
	* of an error, PTR_ERR() returns the error code.
	*/
	struct crypto_acomp crypto_alloc_acomp(const char alg_name, u32 type,
	u32 mask);

	static inline struct crypto_tfm crypto_acomp_tfm(struct crypto_acomp tfm)
	{
	return &tfm->base;
	}

	static inline struct acomp_alg __crypto_acomp_alg(struct crypto_alg alg)
	{
	return container_of(alg, struct acomp_alg, base);
	}

	static inline struct crypto_acomp __crypto_acomp_tfm(struct crypto_tfm tfm)
	{
	return container_of(tfm, struct crypto_acomp, base);
	}

	static inline struct acomp_alg crypto_acomp_alg(struct crypto_acomp tfm)
	{
	return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
	}

	static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
	{
	return tfm->reqsize;
	}

	static inline void acomp_request_set_tfm(struct acomp_req *req,
	struct crypto_acomp *tfm)
	{
	req->base.tfm = crypto_acomp_tfm(tfm);
	}

	static inline struct crypto_acomp crypto_acomp_reqtfm(struct acomp_req req)
	{
	return __crypto_acomp_tfm(req->base.tfm);
	}

	/**
	* crypto_free_acomp() -- free ACOMPRESS tfm handle
	*
	* @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
	*/
	static inline void crypto_free_acomp(struct crypto_acomp *tfm)
	{
	crypto_destroy_tfm(tfm, crypto_acomp_tfm(tfm));
	}

	static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask)
	{
	type &= ~CRYPTO_ALG_TYPE_MASK;
	type \|= CRYPTO_ALG_TYPE_ACOMPRESS;
	mask \|= CRYPTO_ALG_TYPE_MASK;

	return crypto_has_alg(alg_name, type, mask);
	}

	/**
	* acomp_request_alloc() -- allocates asynchronous (de)compression request
	*
	* @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
	*
	* Return: allocated handle in case of success or NULL in case of an error
	*/
	struct acomp_req acomp_request_alloc(struct crypto_acomp tfm);

	/**
	* acomp_request_free() -- zeroize and free asynchronous (de)compression
	* request as well as the output buffer if allocated
	* inside the algorithm
	*
	* @req: request to free
	*/
	void acomp_request_free(struct acomp_req *req);

	/**
	* acomp_request_set_callback() -- Sets an asynchronous callback
	*
	* Callback will be called when an asynchronous operation on a given
	* request is finished.
	*
	* @req: request that the callback will be set for
	* @flgs: specify for instance if the operation may backlog
	* @cmlp: callback which will be called
	* @data: private data used by the caller
	*/
	static inline void acomp_request_set_callback(struct acomp_req *req,
	u32 flgs,
	crypto_completion_t cmpl,
	void *data)
	{
	req->base.complete = cmpl;
	req->base.data = data;
	req->base.flags = flgs;
	}

	/**
	* acomp_request_set_params() -- Sets request parameters
	*
	* Sets parameters required by an acomp operation
	*
	* @req: asynchronous compress request
	* @src: pointer to input buffer scatterlist
	* @dst: pointer to output buffer scatterlist. If this is NULL, the
	* acomp layer will allocate the output memory
	* @slen: size of the input buffer
	* @dlen: size of the output buffer. If dst is NULL, this can be used by
	* the user to specify the maximum amount of memory to allocate
	*/
	static inline void acomp_request_set_params(struct acomp_req *req,
	struct scatterlist *src,
	struct scatterlist *dst,
	unsigned int slen,
	unsigned int dlen)
	{
	req->src = src;
	req->dst = dst;
	req->slen = slen;
	req->dlen = dlen;

	if (!req->dst)
	req->flags \|= CRYPTO_ACOMP_ALLOC_OUTPUT;
	}

	/**
	* crypto_acomp_compress() -- Invoke asynchronous compress operation
	*
	* Function invokes the asynchronous compress operation
	*
	* @req: asynchronous compress request
	*
	* Return: zero on success; error code in case of error
	*/
	static inline int crypto_acomp_compress(struct acomp_req *req)
	{
	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	struct crypto_alg *alg = tfm->base.__crt_alg;
	unsigned int slen = req->slen;
	int ret;

	crypto_stats_get(alg);
	ret = tfm->compress(req);
	crypto_stats_compress(slen, ret, alg);
	return ret;
	}

	/**
	* crypto_acomp_decompress() -- Invoke asynchronous decompress operation
	*
	* Function invokes the asynchronous decompress operation
	*
	* @req: asynchronous compress request
	*
	* Return: zero on success; error code in case of error
	*/
	static inline int crypto_acomp_decompress(struct acomp_req *req)
	{
	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	struct crypto_alg *alg = tfm->base.__crt_alg;
	unsigned int slen = req->slen;
	int ret;

	crypto_stats_get(alg);
	ret = tfm->decompress(req);
	crypto_stats_decompress(slen, ret, alg);
	return ret;
	}

	#endif