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_INT_H
10#define _CRYPTO_ACOMP_INT_H
11
12#include <crypto/acompress.h>
13#include <crypto/algapi.h>
14
15/**
16 * struct acomp_alg - asynchronous compression algorithm
17 *
18 * @compress:	Function performs a compress operation
19 * @decompress:	Function performs a de-compress operation
20 * @dst_free:	Frees destination buffer if allocated inside the algorithm
21 * @init:	Initialize the cryptographic transformation object.
22 *		This function is used to initialize the cryptographic
23 *		transformation object. This function is called only once at
24 *		the instantiation time, right after the transformation context
25 *		was allocated. In case the cryptographic hardware has some
26 *		special requirements which need to be handled by software, this
27 *		function shall check for the precise requirement of the
28 *		transformation and put any software fallbacks in place.
29 * @exit:	Deinitialize the cryptographic transformation object. This is a
30 *		counterpart to @init, used to remove various changes set in
31 *		@init.
32 *
33 * @reqsize:	Context size for (de)compression requests
34 * @stat:	Statistics for compress algorithm
35 * @base:	Common crypto API algorithm data structure
36 * @calg:	Cmonn algorithm data structure shared with scomp
37 */
38struct acomp_alg {
39	int (*compress)(struct acomp_req *req);
40	int (*decompress)(struct acomp_req *req);
41	void (*dst_free)(struct scatterlist *dst);
42	int (*init)(struct crypto_acomp *tfm);
43	void (*exit)(struct crypto_acomp *tfm);
44
45	unsigned int reqsize;
46
47	union {
48		struct COMP_ALG_COMMON;
49		struct comp_alg_common calg;
50	};
51};
52
53/*
54 * Transform internal helpers.
55 */
56static inline void *acomp_request_ctx(struct acomp_req *req)
57{
58	return req->__ctx;
59}
60
61static inline void *acomp_tfm_ctx(struct crypto_acomp *tfm)
62{
63	return tfm->base.__crt_ctx;
64}
65
66static inline void acomp_request_complete(struct acomp_req *req,
67					  int err)
68{
69	crypto_request_complete(&req->base, err);
70}
71
72static inline struct acomp_req *__acomp_request_alloc(struct crypto_acomp *tfm)
73{
74	struct acomp_req *req;
75
76	req = kzalloc(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
77	if (likely(req))
78		acomp_request_set_tfm(req, tfm);
79	return req;
80}
81
82static inline void __acomp_request_free(struct acomp_req *req)
83{
84	kfree_sensitive(req);
85}
86
87/**
88 * crypto_register_acomp() -- Register asynchronous compression algorithm
89 *
90 * Function registers an implementation of an asynchronous
91 * compression algorithm
92 *
93 * @alg:	algorithm definition
94 *
95 * Return:	zero on success; error code in case of error
96 */
97int crypto_register_acomp(struct acomp_alg *alg);
98
99/**
100 * crypto_unregister_acomp() -- Unregister asynchronous compression algorithm
101 *
102 * Function unregisters an implementation of an asynchronous
103 * compression algorithm
104 *
105 * @alg:	algorithm definition
106 */
107void crypto_unregister_acomp(struct acomp_alg *alg);
108
109int crypto_register_acomps(struct acomp_alg *algs, int count);
110void crypto_unregister_acomps(struct acomp_alg *algs, int count);
111
112#endif
113