113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Asynchronous Compression operations
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*
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* Copyright (c) 2016, Intel Corporation
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* Authors: Weigang Li <weigang.li@intel.com>
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* Giovanni Cabiddu <giovanni.cabiddu@intel.com>
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*/
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#ifndef _CRYPTO_ACOMP_INT_H
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#define _CRYPTO_ACOMP_INT_H
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#include <crypto/acompress.h>
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#include <crypto/algapi.h>
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/**
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* struct acomp_alg - asynchronous compression algorithm
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*
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* @compress: Function performs a compress operation
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* @decompress: Function performs a de-compress operation
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* @dst_free: Frees destination buffer if allocated inside the algorithm
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* @init: Initialize the cryptographic transformation object.
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* This function is used to initialize the cryptographic
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* transformation object. This function is called only once at
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* the instantiation time, right after the transformation context
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* was allocated. In case the cryptographic hardware has some
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* special requirements which need to be handled by software, this
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* function shall check for the precise requirement of the
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* transformation and put any software fallbacks in place.
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* @exit: Deinitialize the cryptographic transformation object. This is a
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* counterpart to @init, used to remove various changes set in
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* @init.
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*
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* @reqsize: Context size for (de)compression requests
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* @base: Common crypto API algorithm data structure
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* @calg: Cmonn algorithm data structure shared with scomp
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*/
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struct acomp_alg {
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int (*compress)(struct acomp_req *req);
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int (*decompress)(struct acomp_req *req);
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void (*dst_free)(struct scatterlist *dst);
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int (*init)(struct crypto_acomp *tfm);
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void (*exit)(struct crypto_acomp *tfm);
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unsigned int reqsize;
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union {
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struct COMP_ALG_COMMON;
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struct comp_alg_common calg;
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};
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};
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/*
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* Transform internal helpers.
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*/
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static inline void *acomp_request_ctx(struct acomp_req *req)
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{
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return req->__ctx;
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}
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static inline void *acomp_tfm_ctx(struct crypto_acomp *tfm)
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{
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return tfm->base.__crt_ctx;
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}
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static inline void acomp_request_complete(struct acomp_req *req,
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int err)
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{
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crypto_request_complete(&req->base, err);
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}
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static inline struct acomp_req *__acomp_request_alloc_noprof(struct crypto_acomp *tfm)
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{
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struct acomp_req *req;
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req = kzalloc_noprof(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
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if (likely(req))
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acomp_request_set_tfm(req, tfm);
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return req;
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}
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#define __acomp_request_alloc(...) alloc_hooks(__acomp_request_alloc_noprof(__VA_ARGS__))
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static inline void __acomp_request_free(struct acomp_req *req)
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{
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kfree_sensitive(req);
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}
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/**
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* crypto_register_acomp() -- Register asynchronous compression algorithm
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*
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* Function registers an implementation of an asynchronous
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* compression algorithm
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*
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* @alg: algorithm definition
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*
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* Return: zero on success; error code in case of error
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*/
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int crypto_register_acomp(struct acomp_alg *alg);
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/**
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* crypto_unregister_acomp() -- Unregister asynchronous compression algorithm
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*
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* Function unregisters an implementation of an asynchronous
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* compression algorithm
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*
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* @alg: algorithm definition
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*/
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void crypto_unregister_acomp(struct acomp_alg *alg);
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int crypto_register_acomps(struct acomp_alg *algs, int count);
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void crypto_unregister_acomps(struct acomp_alg *algs, int count);
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#endif
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