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crypto: acomp - add support for lz4 via scomp

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Add scomp backend for lz4 compression algorithm.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Giovanni Cabiddu 2016-10-21 13:19:50 +01:00 committed by Herbert Xu
parent ac9d2c4b39
commit 8cd9330e0a
2 changed files with 82 additions and 10 deletions
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1
crypto/Kconfig
View File

@ -1606,6 +1606,7 @@ config CRYPTO_842
config CRYPTO_LZ4
tristate "LZ4 compression algorithm"
select CRYPTO_ALGAPI
select CRYPTO_ACOMP2
select LZ4_COMPRESS
select LZ4_DECOMPRESS
help

91
crypto/lz4.c
View File

@ -23,36 +23,53 @@
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <linux/lz4.h>
#include <crypto/internal/scompress.h>
struct lz4_ctx {
void *lz4_comp_mem;
};
static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
{
void *ctx;
ctx = vmalloc(LZ4_MEM_COMPRESS);
if (!ctx)
return ERR_PTR(-ENOMEM);
return ctx;
}
static int lz4_init(struct crypto_tfm *tfm)
{
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->lz4_comp_mem = vmalloc(LZ4_MEM_COMPRESS);
if (!ctx->lz4_comp_mem)
ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
if (IS_ERR(ctx->lz4_comp_mem))
return -ENOMEM;
return 0;
}
static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
vfree(ctx);
}
static void lz4_exit(struct crypto_tfm *tfm)
{
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
vfree(ctx->lz4_comp_mem);
lz4_free_ctx(NULL, ctx->lz4_comp_mem);
}
static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
size_t tmp_len = *dlen;
int err;
err = lz4_compress(src, slen, dst, &tmp_len, ctx->lz4_comp_mem);
err = lz4_compress(src, slen, dst, &tmp_len, ctx);
if (err < 0)
return -EINVAL;
@ -61,8 +78,23 @@ static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
return 0;
}
static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen,
void *ctx)
{
return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
}
static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen)
{
struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
}
static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen, void *ctx)
{
int err;
size_t tmp_len = *dlen;
@ -76,6 +108,20 @@ static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
return err;
}
static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
unsigned int slen, u8 *dst, unsigned int *dlen,
void *ctx)
{
return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
}
static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
unsigned int slen, u8 *dst,
unsigned int *dlen)
{
return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
}
static struct crypto_alg alg_lz4 = {
.cra_name = "lz4",
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
@ -89,14 +135,39 @@ static struct crypto_alg alg_lz4 = {
.coa_decompress = lz4_decompress_crypto } }
};
static struct scomp_alg scomp = {
.alloc_ctx = lz4_alloc_ctx,
.free_ctx = lz4_free_ctx,
.compress = lz4_scompress,
.decompress = lz4_sdecompress,
.base = {
.cra_name = "lz4",
.cra_driver_name = "lz4-scomp",
.cra_module = THIS_MODULE,
}
};
static int __init lz4_mod_init(void)
{
return crypto_register_alg(&alg_lz4);
int ret;
ret = crypto_register_alg(&alg_lz4);
if (ret)
return ret;
ret = crypto_register_scomp(&scomp);
if (ret) {
crypto_unregister_alg(&alg_lz4);
return ret;
}
return ret;
}
static void __exit lz4_mod_fini(void)
{
crypto_unregister_alg(&alg_lz4);
crypto_unregister_scomp(&scomp);
}
module_init(lz4_mod_init);