/*
- * 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
* 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>");
Code Review / kvmfornfv.git / blobdiff