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authorGiovanni Cabiddu <giovanni.cabiddu@intel.com>2016-10-21 13:19:50 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2016-10-25 11:08:32 +0800
commit8cd9330e0a615c931037d4def98b5ce0d540f08d (patch)
treeea617e3c32da90177f9075ff3c717cfbe1a4a7a9 /crypto/lz4.c
parentac9d2c4b39e022d2c61486bfc33b730cfd02898e (diff)
downloadlwn-8cd9330e0a615c931037d4def98b5ce0d540f08d.tar.gz
lwn-8cd9330e0a615c931037d4def98b5ce0d540f08d.zip
crypto: acomp - add support for lz4 via scomp
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>
Diffstat (limited to 'crypto/lz4.c')
-rw-r--r--crypto/lz4.c91
1 files changed, 81 insertions, 10 deletions
diff --git a/crypto/lz4.c b/crypto/lz4.c
index aefbceaf3104..99c1b2cc2976 100644
--- a/crypto/lz4.c
+++ b/crypto/lz4.c
@@ -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);