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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - crypto/842.c
2 * Cryptographic API for the 842 compression algorithm.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * Copyright (C) IBM Corporation, 2011
20 * Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
21 * Seth Jennings <sjenning@linux.vnet.ibm.com>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/crypto.h>
27 #include <linux/vmalloc.h>
28 #include <linux/nx842.h>
29 #include <linux/lzo.h>
30 #include <linux/timer.h>
32 static int nx842_uselzo
;
35 void *nx842_wmem
; /* working memory for 842/lzo */
38 enum nx842_crypto_type
{
39 NX842_CRYPTO_TYPE_842
,
43 #define NX842_SENTINEL 0xdeadbeef
45 struct nx842_crypto_header
{
46 unsigned int sentinel
; /* debug */
47 enum nx842_crypto_type type
;
50 static int nx842_init(struct crypto_tfm
*tfm
)
52 struct nx842_ctx
*ctx
= crypto_tfm_ctx(tfm
);
55 wmemsize
= max_t(int, nx842_get_workmem_size(), LZO1X_MEM_COMPRESS
);
56 ctx
->nx842_wmem
= kmalloc(wmemsize
, GFP_NOFS
);
63 static void nx842_exit(struct crypto_tfm
*tfm
)
65 struct nx842_ctx
*ctx
= crypto_tfm_ctx(tfm
);
67 kfree(ctx
->nx842_wmem
);
70 static void nx842_reset_uselzo(unsigned long data
)
75 static DEFINE_TIMER(failover_timer
, nx842_reset_uselzo
, 0, 0);
77 static int nx842_crypto_compress(struct crypto_tfm
*tfm
, const u8
*src
,
78 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
80 struct nx842_ctx
*ctx
= crypto_tfm_ctx(tfm
);
81 struct nx842_crypto_header
*hdr
;
82 unsigned int tmp_len
= *dlen
;
83 size_t lzodlen
; /* needed for lzo */
87 hdr
= (struct nx842_crypto_header
*)dst
;
88 hdr
->sentinel
= NX842_SENTINEL
; /* debug */
89 dst
+= sizeof(struct nx842_crypto_header
);
90 tmp_len
-= sizeof(struct nx842_crypto_header
);
93 if (likely(!nx842_uselzo
)) {
94 err
= nx842_compress(src
, slen
, dst
, &tmp_len
, ctx
->nx842_wmem
);
97 hdr
->type
= NX842_CRYPTO_TYPE_842
;
98 *dlen
= tmp_len
+ sizeof(struct nx842_crypto_header
);
102 /* hardware failed */
105 /* set timer to check for hardware again in 1 second */
106 mod_timer(&failover_timer
, jiffies
+ msecs_to_jiffies(1000));
109 /* no hardware, use lzo */
110 err
= lzo1x_1_compress(src
, slen
, dst
, &lzodlen
, ctx
->nx842_wmem
);
114 hdr
->type
= NX842_CRYPTO_TYPE_LZO
;
115 *dlen
= lzodlen
+ sizeof(struct nx842_crypto_header
);
119 static int nx842_crypto_decompress(struct crypto_tfm
*tfm
, const u8
*src
,
120 unsigned int slen
, u8
*dst
, unsigned int *dlen
)
122 struct nx842_ctx
*ctx
= crypto_tfm_ctx(tfm
);
123 struct nx842_crypto_header
*hdr
;
124 unsigned int tmp_len
= *dlen
;
125 size_t lzodlen
; /* needed for lzo */
129 hdr
= (struct nx842_crypto_header
*)src
;
131 if (unlikely(hdr
->sentinel
!= NX842_SENTINEL
))
134 src
+= sizeof(struct nx842_crypto_header
);
135 slen
-= sizeof(struct nx842_crypto_header
);
137 if (likely(hdr
->type
== NX842_CRYPTO_TYPE_842
)) {
138 err
= nx842_decompress(src
, slen
, dst
, &tmp_len
,
143 } else if (hdr
->type
== NX842_CRYPTO_TYPE_LZO
) {
145 err
= lzo1x_decompress_safe(src
, slen
, dst
, &lzodlen
);
155 static struct crypto_alg alg
= {
157 .cra_flags
= CRYPTO_ALG_TYPE_COMPRESS
,
158 .cra_ctxsize
= sizeof(struct nx842_ctx
),
159 .cra_module
= THIS_MODULE
,
160 .cra_init
= nx842_init
,
161 .cra_exit
= nx842_exit
,
162 .cra_u
= { .compress
= {
163 .coa_compress
= nx842_crypto_compress
,
164 .coa_decompress
= nx842_crypto_decompress
} }
167 static int __init
nx842_mod_init(void)
169 del_timer(&failover_timer
);
170 return crypto_register_alg(&alg
);
173 static void __exit
nx842_mod_exit(void)
175 crypto_unregister_alg(&alg
);
178 module_init(nx842_mod_init
);
179 module_exit(nx842_mod_exit
);
181 MODULE_LICENSE("GPL");
182 MODULE_DESCRIPTION("842 Compression Algorithm");
183 MODULE_ALIAS_CRYPTO("842");