diff options
Diffstat (limited to 'kernel/crypto/842.c')
| -rw-r--r-- | kernel/crypto/842.c | 174 |
1 files changed, 37 insertions, 137 deletions
diff --git a/kernel/crypto/842.c b/kernel/crypto/842.c index b48f4f108..98e387efb 100644 --- a/kernel/crypto/842.c +++ b/kernel/crypto/842.c @@ -1,5 +1,5 @@ /* - * Cryptographic API for the 842 compression algorithm. + * Cryptographic API for the 842 software 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 @@ -11,173 +11,73 @@ * 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, 2011-2015 * - * Copyright (C) IBM Corporation, 2011 + * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com> + * Seth Jennings <sjenning@linux.vnet.ibm.com> * - * Authors: Robert Jennings <rcj@linux.vnet.ibm.com> - * Seth Jennings <sjenning@linux.vnet.ibm.com> + * Rewrite: Dan Streetman <ddstreet@ieee.org> + * + * This is the software implementation of compression and decompression using + * the 842 format. This uses the software 842 library at lib/842/ which is + * only a reference implementation, and is very, very slow as compared to other + * software compressors. You probably do not want to use this software + * compression. If you have access to the PowerPC 842 compression hardware, you + * want to use the 842 hardware compression interface, which is at: + * drivers/crypto/nx/nx-842-crypto.c */ #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 */ -}; +#include <linux/sw842.h> -enum nx842_crypto_type { - NX842_CRYPTO_TYPE_842, - NX842_CRYPTO_TYPE_LZO +struct crypto842_ctx { + char wmem[SW842_MEM_COMPRESS]; /* working memory for compress */ }; -#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) +static int crypto842_compress(struct crypto_tfm *tfm, + const u8 *src, unsigned int slen, + u8 *dst, unsigned int *dlen) { - 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; + struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm); - /* 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; + return sw842_compress(src, slen, dst, dlen, ctx->wmem); } -static int nx842_crypto_decompress(struct crypto_tfm *tfm, const u8 *src, - unsigned int slen, u8 *dst, unsigned int *dlen) +static int crypto842_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; + return sw842_decompress(src, slen, dst, dlen); } static struct crypto_alg alg = { .cra_name = "842", + .cra_driver_name = "842-generic", + .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_COMPRESS, - .cra_ctxsize = sizeof(struct nx842_ctx), + .cra_ctxsize = sizeof(struct crypto842_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 } } + .coa_compress = crypto842_compress, + .coa_decompress = crypto842_decompress } } }; -static int __init nx842_mod_init(void) +static int __init crypto842_mod_init(void) { - del_timer(&failover_timer); return crypto_register_alg(&alg); } +module_init(crypto842_mod_init); -static void __exit nx842_mod_exit(void) +static void __exit crypto842_mod_exit(void) { crypto_unregister_alg(&alg); } - -module_init(nx842_mod_init); -module_exit(nx842_mod_exit); +module_exit(crypto842_mod_exit); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("842 Compression Algorithm"); +MODULE_DESCRIPTION("842 Software Compression Algorithm"); MODULE_ALIAS_CRYPTO("842"); +MODULE_ALIAS_CRYPTO("842-generic"); +MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); |