6b13f685e
 김민수
BSP 최초 추가
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Cryptographic API for the 842 compression algorithm.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (C) IBM Corporation, 2011
*
* Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
* Seth Jennings <sjenning@linux.vnet.ibm.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/nx842.h>
#include <linux/lzo.h>
#include <linux/timer.h>
static int nx842_uselzo;
struct nx842_ctx {
void *nx842_wmem; /* working memory for 842/lzo */
};
enum nx842_crypto_type {
NX842_CRYPTO_TYPE_842,
NX842_CRYPTO_TYPE_LZO
};
#define NX842_SENTINEL 0xdeadbeef
struct nx842_crypto_header {
unsigned int sentinel; /* debug */
enum nx842_crypto_type type;
};
static int nx842_init(struct crypto_tfm *tfm)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
int wmemsize;
wmemsize = max_t(int, nx842_get_workmem_size(), LZO1X_MEM_COMPRESS);
ctx->nx842_wmem = kmalloc(wmemsize, GFP_NOFS);
if (!ctx->nx842_wmem)
return -ENOMEM;
return 0;
}
static void nx842_exit(struct crypto_tfm *tfm)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
kfree(ctx->nx842_wmem);
}
static void nx842_reset_uselzo(unsigned long data)
{
nx842_uselzo = 0;
}
static DEFINE_TIMER(failover_timer, nx842_reset_uselzo, 0, 0);
static int nx842_crypto_compress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
struct nx842_crypto_header *hdr;
unsigned int tmp_len = *dlen;
size_t lzodlen; /* needed for lzo */
int err;
*dlen = 0;
hdr = (struct nx842_crypto_header *)dst;
hdr->sentinel = NX842_SENTINEL; /* debug */
dst += sizeof(struct nx842_crypto_header);
tmp_len -= sizeof(struct nx842_crypto_header);
lzodlen = tmp_len;
if (likely(!nx842_uselzo)) {
err = nx842_compress(src, slen, dst, &tmp_len, ctx->nx842_wmem);
if (likely(!err)) {
hdr->type = NX842_CRYPTO_TYPE_842;
*dlen = tmp_len + sizeof(struct nx842_crypto_header);
return 0;
}
/* hardware failed */
nx842_uselzo = 1;
/* set timer to check for hardware again in 1 second */
mod_timer(&failover_timer, jiffies + msecs_to_jiffies(1000));
}
/* no hardware, use lzo */
err = lzo1x_1_compress(src, slen, dst, &lzodlen, ctx->nx842_wmem);
if (err != LZO_E_OK)
return -EINVAL;
hdr->type = NX842_CRYPTO_TYPE_LZO;
*dlen = lzodlen + sizeof(struct nx842_crypto_header);
return 0;
}
static int nx842_crypto_decompress(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct nx842_ctx *ctx = crypto_tfm_ctx(tfm);
struct nx842_crypto_header *hdr;
unsigned int tmp_len = *dlen;
size_t lzodlen; /* needed for lzo */
int err;
*dlen = 0;
hdr = (struct nx842_crypto_header *)src;
if (unlikely(hdr->sentinel != NX842_SENTINEL))
return -EINVAL;
src += sizeof(struct nx842_crypto_header);
slen -= sizeof(struct nx842_crypto_header);
if (likely(hdr->type == NX842_CRYPTO_TYPE_842)) {
err = nx842_decompress(src, slen, dst, &tmp_len,
ctx->nx842_wmem);
if (err)
return -EINVAL;
*dlen = tmp_len;
} else if (hdr->type == NX842_CRYPTO_TYPE_LZO) {
lzodlen = tmp_len;
err = lzo1x_decompress_safe(src, slen, dst, &lzodlen);
if (err != LZO_E_OK)
return -EINVAL;
*dlen = lzodlen;
} else
return -EINVAL;
return 0;
}
static struct crypto_alg alg = {
.cra_name = "842",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
.cra_ctxsize = sizeof(struct nx842_ctx),
.cra_module = THIS_MODULE,
.cra_init = nx842_init,
.cra_exit = nx842_exit,
.cra_u = { .compress = {
.coa_compress = nx842_crypto_compress,
.coa_decompress = nx842_crypto_decompress } }
};
static int __init nx842_mod_init(void)
{
del_timer(&failover_timer);
return crypto_register_alg(&alg);
}
static void __exit nx842_mod_exit(void)
{
crypto_unregister_alg(&alg);
}
module_init(nx842_mod_init);
module_exit(nx842_mod_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("842 Compression Algorithm");
|