Root/
1 | /* |
2 | * Cryptographic API for the 842 compression algorithm. |
3 | * |
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. |
8 | * |
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. |
13 | * |
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. |
17 | * |
18 | * Copyright (C) IBM Corporation, 2011 |
19 | * |
20 | * Authors: Robert Jennings <rcj@linux.vnet.ibm.com> |
21 | * Seth Jennings <sjenning@linux.vnet.ibm.com> |
22 | */ |
23 | |
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> |
31 | |
32 | static int nx842_uselzo; |
33 | |
34 | struct nx842_ctx { |
35 | void *nx842_wmem; /* working memory for 842/lzo */ |
36 | }; |
37 | |
38 | enum nx842_crypto_type { |
39 | NX842_CRYPTO_TYPE_842, |
40 | NX842_CRYPTO_TYPE_LZO |
41 | }; |
42 | |
43 | #define NX842_SENTINEL 0xdeadbeef |
44 | |
45 | struct nx842_crypto_header { |
46 | unsigned int sentinel; /* debug */ |
47 | enum nx842_crypto_type type; |
48 | }; |
49 | |
50 | static int nx842_init(struct crypto_tfm *tfm) |
51 | { |
52 | struct nx842_ctx *ctx = crypto_tfm_ctx(tfm); |
53 | int wmemsize; |
54 | |
55 | wmemsize = max_t(int, nx842_get_workmem_size(), LZO1X_MEM_COMPRESS); |
56 | ctx->nx842_wmem = kmalloc(wmemsize, GFP_NOFS); |
57 | if (!ctx->nx842_wmem) |
58 | return -ENOMEM; |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | static void nx842_exit(struct crypto_tfm *tfm) |
64 | { |
65 | struct nx842_ctx *ctx = crypto_tfm_ctx(tfm); |
66 | |
67 | kfree(ctx->nx842_wmem); |
68 | } |
69 | |
70 | static void nx842_reset_uselzo(unsigned long data) |
71 | { |
72 | nx842_uselzo = 0; |
73 | } |
74 | |
75 | static DEFINE_TIMER(failover_timer, nx842_reset_uselzo, 0, 0); |
76 | |
77 | static int nx842_crypto_compress(struct crypto_tfm *tfm, const u8 *src, |
78 | unsigned int slen, u8 *dst, unsigned int *dlen) |
79 | { |
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 */ |
84 | int err; |
85 | |
86 | *dlen = 0; |
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); |
91 | lzodlen = tmp_len; |
92 | |
93 | if (likely(!nx842_uselzo)) { |
94 | err = nx842_compress(src, slen, dst, &tmp_len, ctx->nx842_wmem); |
95 | |
96 | if (likely(!err)) { |
97 | hdr->type = NX842_CRYPTO_TYPE_842; |
98 | *dlen = tmp_len + sizeof(struct nx842_crypto_header); |
99 | return 0; |
100 | } |
101 | |
102 | /* hardware failed */ |
103 | nx842_uselzo = 1; |
104 | |
105 | /* set timer to check for hardware again in 1 second */ |
106 | mod_timer(&failover_timer, jiffies + msecs_to_jiffies(1000)); |
107 | } |
108 | |
109 | /* no hardware, use lzo */ |
110 | err = lzo1x_1_compress(src, slen, dst, &lzodlen, ctx->nx842_wmem); |
111 | if (err != LZO_E_OK) |
112 | return -EINVAL; |
113 | |
114 | hdr->type = NX842_CRYPTO_TYPE_LZO; |
115 | *dlen = lzodlen + sizeof(struct nx842_crypto_header); |
116 | return 0; |
117 | } |
118 | |
119 | static int nx842_crypto_decompress(struct crypto_tfm *tfm, const u8 *src, |
120 | unsigned int slen, u8 *dst, unsigned int *dlen) |
121 | { |
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 */ |
126 | int err; |
127 | |
128 | *dlen = 0; |
129 | hdr = (struct nx842_crypto_header *)src; |
130 | |
131 | if (unlikely(hdr->sentinel != NX842_SENTINEL)) |
132 | return -EINVAL; |
133 | |
134 | src += sizeof(struct nx842_crypto_header); |
135 | slen -= sizeof(struct nx842_crypto_header); |
136 | |
137 | if (likely(hdr->type == NX842_CRYPTO_TYPE_842)) { |
138 | err = nx842_decompress(src, slen, dst, &tmp_len, |
139 | ctx->nx842_wmem); |
140 | if (err) |
141 | return -EINVAL; |
142 | *dlen = tmp_len; |
143 | } else if (hdr->type == NX842_CRYPTO_TYPE_LZO) { |
144 | lzodlen = tmp_len; |
145 | err = lzo1x_decompress_safe(src, slen, dst, &lzodlen); |
146 | if (err != LZO_E_OK) |
147 | return -EINVAL; |
148 | *dlen = lzodlen; |
149 | } else |
150 | return -EINVAL; |
151 | |
152 | return 0; |
153 | } |
154 | |
155 | static struct crypto_alg alg = { |
156 | .cra_name = "842", |
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 } } |
165 | }; |
166 | |
167 | static int __init nx842_mod_init(void) |
168 | { |
169 | del_timer(&failover_timer); |
170 | return crypto_register_alg(&alg); |
171 | } |
172 | |
173 | static void __exit nx842_mod_exit(void) |
174 | { |
175 | crypto_unregister_alg(&alg); |
176 | } |
177 | |
178 | module_init(nx842_mod_init); |
179 | module_exit(nx842_mod_exit); |
180 | |
181 | MODULE_LICENSE("GPL"); |
182 | MODULE_DESCRIPTION("842 Compression Algorithm"); |
183 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9