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>

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 7ffd418b69f865fc2f4add85cf4604d01abec77c..acbcd32f7cf3e5a9437b72c8fdb0ee8658332083 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -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

diff --git a/crypto/lz4.c b/crypto/lz4.c
index aefbceaf3104f0df1904dbae4d0c193152f62c07..99c1b2cc2976ad31aca9cfef182bf0318b6e95af 100644 (file)
--- 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);