acompress.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Asynchronous Compression operations
 *
 * Copyright (c) 2016, Intel Corporation
 * Authors: Weigang Li <[email protected]>
 *          Giovanni Cabiddu <[email protected]>
 */
#ifndef _CRYPTO_ACOMP_H
#define _CRYPTO_ACOMP_H

#include <linux/atomic.h>
#include <linux/container_of.h>
#include <linux/crypto.h>

#define CRYPTO_ACOMP_ALLOC_OUTPUT …
#define CRYPTO_ACOMP_DST_MAX …

/**
 * 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_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 { … };

#define COMP_ALG_COMMON …
struct comp_alg_common COMP_ALG_COMMON;

/**
 * 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);
/**
 * crypto_alloc_acomp_node() -- allocate ACOMPRESS tfm handle with desired NUMA node
 * @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
 * @node:	specifies the NUMA node the ZIP hardware belongs to
 *
 * Allocate a handle for a compression algorithm. Drivers should try to use
 * (de)compressors on the specified NUMA node.
 * 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_node(const char *alg_name, u32 type,
					u32 mask, int node);

static inline struct crypto_tfm *crypto_acomp_tfm(struct crypto_acomp *tfm)
{ … }

static inline struct comp_alg_common *__crypto_comp_alg_common(
	struct crypto_alg *alg)
{ … }

static inline struct crypto_acomp *__crypto_acomp_tfm(struct crypto_tfm *tfm)
{ … }

static inline struct comp_alg_common *crypto_comp_alg_common(
	struct crypto_acomp *tfm)
{ … }

static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
{ … }

static inline void acomp_request_set_tfm(struct acomp_req *req,
					 struct crypto_acomp *tfm)
{ … }

static inline bool acomp_is_async(struct crypto_acomp *tfm)
{ … }

static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
{ … }

/**
 * crypto_free_acomp() -- free ACOMPRESS tfm handle
 *
 * @tfm:	ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
 *
 * If @tfm is a NULL or error pointer, this function does nothing.
 */
static inline void crypto_free_acomp(struct crypto_acomp *tfm)
{ … }

static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

/**
 * 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)
{ … }

#endif
linux/include/crypto/acompress.h
