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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 */
26struct 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 */
47struct 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 */
76struct 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 */
107struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
108 u32 mask);
109
110static inline struct crypto_tfm *crypto_acomp_tfm(struct crypto_acomp *tfm)
111{
112 return &tfm->base;
113}
114
115static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
116{
117 return container_of(alg, struct acomp_alg, base);
118}
119
120static inline struct crypto_acomp *__crypto_acomp_tfm(struct crypto_tfm *tfm)
121{
122 return container_of(tfm, struct crypto_acomp, base);
123}
124
125static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
126{
127 return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
128}
129
130static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
131{
132 return tfm->reqsize;
133}
134
135static inline void acomp_request_set_tfm(struct acomp_req *req,
136 struct crypto_acomp *tfm)
137{
138 req->base.tfm = crypto_acomp_tfm(tfm);
139}
140
141static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
142{
143 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 */
151static inline void crypto_free_acomp(struct crypto_acomp *tfm)
152{
153 crypto_destroy_tfm(tfm, crypto_acomp_tfm(tfm));
154}
155
156static 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 */
172struct 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 */
181void 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 */
194static 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 */
217static 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 */
241static 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 */
263static 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
1/*
2 * Asynchronous Compression operations
3 *
4 * Copyright (c) 2016, Intel Corporation
5 * Authors: Weigang Li <weigang.li@intel.com>
6 * Giovanni Cabiddu <giovanni.cabiddu@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 */
14#ifndef _CRYPTO_ACOMP_H
15#define _CRYPTO_ACOMP_H
16#include <linux/crypto.h>
17
18#define CRYPTO_ACOMP_ALLOC_OUTPUT 0x00000001
19
20/**
21 * struct acomp_req - asynchronous (de)compression request
22 *
23 * @base: Common attributes for asynchronous crypto requests
24 * @src: Source Data
25 * @dst: Destination data
26 * @slen: Size of the input buffer
27 * @dlen: Size of the output buffer and number of bytes produced
28 * @flags: Internal flags
29 * @__ctx: Start of private context data
30 */
31struct acomp_req {
32 struct crypto_async_request base;
33 struct scatterlist *src;
34 struct scatterlist *dst;
35 unsigned int slen;
36 unsigned int dlen;
37 u32 flags;
38 void *__ctx[] CRYPTO_MINALIGN_ATTR;
39};
40
41/**
42 * struct crypto_acomp - user-instantiated objects which encapsulate
43 * algorithms and core processing logic
44 *
45 * @compress: Function performs a compress operation
46 * @decompress: Function performs a de-compress operation
47 * @dst_free: Frees destination buffer if allocated inside the
48 * algorithm
49 * @reqsize: Context size for (de)compression requests
50 * @base: Common crypto API algorithm data structure
51 */
52struct crypto_acomp {
53 int (*compress)(struct acomp_req *req);
54 int (*decompress)(struct acomp_req *req);
55 void (*dst_free)(struct scatterlist *dst);
56 unsigned int reqsize;
57 struct crypto_tfm base;
58};
59
60/**
61 * struct acomp_alg - asynchronous compression algorithm
62 *
63 * @compress: Function performs a compress operation
64 * @decompress: Function performs a de-compress operation
65 * @dst_free: Frees destination buffer if allocated inside the algorithm
66 * @init: Initialize the cryptographic transformation object.
67 * This function is used to initialize the cryptographic
68 * transformation object. This function is called only once at
69 * the instantiation time, right after the transformation context
70 * was allocated. In case the cryptographic hardware has some
71 * special requirements which need to be handled by software, this
72 * function shall check for the precise requirement of the
73 * transformation and put any software fallbacks in place.
74 * @exit: Deinitialize the cryptographic transformation object. This is a
75 * counterpart to @init, used to remove various changes set in
76 * @init.
77 *
78 * @reqsize: Context size for (de)compression requests
79 * @base: Common crypto API algorithm data structure
80 */
81struct acomp_alg {
82 int (*compress)(struct acomp_req *req);
83 int (*decompress)(struct acomp_req *req);
84 void (*dst_free)(struct scatterlist *dst);
85 int (*init)(struct crypto_acomp *tfm);
86 void (*exit)(struct crypto_acomp *tfm);
87 unsigned int reqsize;
88 struct crypto_alg base;
89};
90
91/**
92 * DOC: Asynchronous Compression API
93 *
94 * The Asynchronous Compression API is used with the algorithms of type
95 * CRYPTO_ALG_TYPE_ACOMPRESS (listed as type "acomp" in /proc/crypto)
96 */
97
98/**
99 * crypto_alloc_acomp() -- allocate ACOMPRESS tfm handle
100 * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
101 * compression algorithm e.g. "deflate"
102 * @type: specifies the type of the algorithm
103 * @mask: specifies the mask for the algorithm
104 *
105 * Allocate a handle for a compression algorithm. The returned struct
106 * crypto_acomp is the handle that is required for any subsequent
107 * API invocation for the compression operations.
108 *
109 * Return: allocated handle in case of success; IS_ERR() is true in case
110 * of an error, PTR_ERR() returns the error code.
111 */
112struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
113 u32 mask);
114
115static inline struct crypto_tfm *crypto_acomp_tfm(struct crypto_acomp *tfm)
116{
117 return &tfm->base;
118}
119
120static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
121{
122 return container_of(alg, struct acomp_alg, base);
123}
124
125static inline struct crypto_acomp *__crypto_acomp_tfm(struct crypto_tfm *tfm)
126{
127 return container_of(tfm, struct crypto_acomp, base);
128}
129
130static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
131{
132 return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
133}
134
135static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
136{
137 return tfm->reqsize;
138}
139
140static inline void acomp_request_set_tfm(struct acomp_req *req,
141 struct crypto_acomp *tfm)
142{
143 req->base.tfm = crypto_acomp_tfm(tfm);
144}
145
146static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
147{
148 return __crypto_acomp_tfm(req->base.tfm);
149}
150
151/**
152 * crypto_free_acomp() -- free ACOMPRESS tfm handle
153 *
154 * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
155 */
156static inline void crypto_free_acomp(struct crypto_acomp *tfm)
157{
158 crypto_destroy_tfm(tfm, crypto_acomp_tfm(tfm));
159}
160
161static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask)
162{
163 type &= ~CRYPTO_ALG_TYPE_MASK;
164 type |= CRYPTO_ALG_TYPE_ACOMPRESS;
165 mask |= CRYPTO_ALG_TYPE_MASK;
166
167 return crypto_has_alg(alg_name, type, mask);
168}
169
170/**
171 * acomp_request_alloc() -- allocates asynchronous (de)compression request
172 *
173 * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
174 *
175 * Return: allocated handle in case of success or NULL in case of an error
176 */
177struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm);
178
179/**
180 * acomp_request_free() -- zeroize and free asynchronous (de)compression
181 * request as well as the output buffer if allocated
182 * inside the algorithm
183 *
184 * @req: request to free
185 */
186void acomp_request_free(struct acomp_req *req);
187
188/**
189 * acomp_request_set_callback() -- Sets an asynchronous callback
190 *
191 * Callback will be called when an asynchronous operation on a given
192 * request is finished.
193 *
194 * @req: request that the callback will be set for
195 * @flgs: specify for instance if the operation may backlog
196 * @cmlp: callback which will be called
197 * @data: private data used by the caller
198 */
199static inline void acomp_request_set_callback(struct acomp_req *req,
200 u32 flgs,
201 crypto_completion_t cmpl,
202 void *data)
203{
204 req->base.complete = cmpl;
205 req->base.data = data;
206 req->base.flags = flgs;
207}
208
209/**
210 * acomp_request_set_params() -- Sets request parameters
211 *
212 * Sets parameters required by an acomp operation
213 *
214 * @req: asynchronous compress request
215 * @src: pointer to input buffer scatterlist
216 * @dst: pointer to output buffer scatterlist. If this is NULL, the
217 * acomp layer will allocate the output memory
218 * @slen: size of the input buffer
219 * @dlen: size of the output buffer. If dst is NULL, this can be used by
220 * the user to specify the maximum amount of memory to allocate
221 */
222static inline void acomp_request_set_params(struct acomp_req *req,
223 struct scatterlist *src,
224 struct scatterlist *dst,
225 unsigned int slen,
226 unsigned int dlen)
227{
228 req->src = src;
229 req->dst = dst;
230 req->slen = slen;
231 req->dlen = dlen;
232
233 if (!req->dst)
234 req->flags |= CRYPTO_ACOMP_ALLOC_OUTPUT;
235}
236
237/**
238 * crypto_acomp_compress() -- Invoke asynchronous compress operation
239 *
240 * Function invokes the asynchronous compress operation
241 *
242 * @req: asynchronous compress request
243 *
244 * Return: zero on success; error code in case of error
245 */
246static inline int crypto_acomp_compress(struct acomp_req *req)
247{
248 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
249
250 return tfm->compress(req);
251}
252
253/**
254 * crypto_acomp_decompress() -- Invoke asynchronous decompress operation
255 *
256 * Function invokes the asynchronous decompress operation
257 *
258 * @req: asynchronous compress request
259 *
260 * Return: zero on success; error code in case of error
261 */
262static inline int crypto_acomp_decompress(struct acomp_req *req)
263{
264 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
265
266 return tfm->decompress(req);
267}
268
269#endif