crypto: acomp - add support for lz4hc via scomp

Add scomp backend for lz4hc 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 acbcd32f7cf3e5a9437b72c8fdb0ee8658332083..a1819e714b88c758b117d25a8dc82ee5bbd89043 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1615,6 +1615,7 @@ config CRYPTO_LZ4
 config CRYPTO_LZ4HC
        tristate "LZ4HC compression algorithm"
        select CRYPTO_ALGAPI
+       select CRYPTO_ACOMP2
        select LZ4HC_COMPRESS
        select LZ4_DECOMPRESS
        help

diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c
index a1d3b5bd3d85118c681098382fb2dd00adc1dac8..75ffc4a3f786c84f867670147e73427c15a20525 100644 (file)
--- a/crypto/lz4hc.c
+++ b/crypto/lz4hc.c
@@ -22,37 +22,53 @@
 #include <linux/crypto.h>
 #include <linux/vmalloc.h>
 #include <linux/lz4.h>
+#include <crypto/internal/scompress.h>
 
 struct lz4hc_ctx {
        void *lz4hc_comp_mem;
 };
 
+static void *lz4hc_alloc_ctx(struct crypto_scomp *tfm)
+{
+       void *ctx;
+
+       ctx = vmalloc(LZ4HC_MEM_COMPRESS);
+       if (!ctx)
+               return ERR_PTR(-ENOMEM);
+
+       return ctx;
+}
+
 static int lz4hc_init(struct crypto_tfm *tfm)
 {
        struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       ctx->lz4hc_comp_mem = vmalloc(LZ4HC_MEM_COMPRESS);
-       if (!ctx->lz4hc_comp_mem)
+       ctx->lz4hc_comp_mem = lz4hc_alloc_ctx(NULL);
+       if (IS_ERR(ctx->lz4hc_comp_mem))
                return -ENOMEM;
 
        return 0;
 }
 
+static void lz4hc_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+       vfree(ctx);
+}
+
 static void lz4hc_exit(struct crypto_tfm *tfm)
 {
        struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
 
-       vfree(ctx->lz4hc_comp_mem);
+       lz4hc_free_ctx(NULL, ctx->lz4hc_comp_mem);
 }
 
-static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
-                           unsigned int slen, u8 *dst, unsigned int *dlen)
+static int __lz4hc_compress_crypto(const u8 *src, unsigned int slen,
+                                  u8 *dst, unsigned int *dlen, void *ctx)
 {
-       struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
        size_t tmp_len = *dlen;
        int err;
 
-       err = lz4hc_compress(src, slen, dst, &tmp_len, ctx->lz4hc_comp_mem);
+       err = lz4hc_compress(src, slen, dst, &tmp_len, ctx);
 
        if (err < 0)
                return -EINVAL;
@@ -61,8 +77,25 @@ static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
        return 0;
 }
 
-static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
-                             unsigned int slen, u8 *dst, unsigned int *dlen)
+static int lz4hc_scompress(struct crypto_scomp *tfm, const u8 *src,
+                          unsigned int slen, u8 *dst, unsigned int *dlen,
+                          void *ctx)
+{
+       return __lz4hc_compress_crypto(src, slen, dst, dlen, ctx);
+}
+
+static int lz4hc_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
+                                unsigned int slen, u8 *dst,
+                                unsigned int *dlen)
+{
+       struct lz4hc_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       return __lz4hc_compress_crypto(src, slen, dst, dlen,
+                                       ctx->lz4hc_comp_mem);
+}
+
+static int __lz4hc_decompress_crypto(const u8 *src, unsigned int slen,
+                                    u8 *dst, unsigned int *dlen, void *ctx)
 {
        int err;
        size_t tmp_len = *dlen;
@@ -76,6 +109,20 @@ static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
        return err;
 }
 
+static int lz4hc_sdecompress(struct crypto_scomp *tfm, const u8 *src,
+                            unsigned int slen, u8 *dst, unsigned int *dlen,
+                            void *ctx)
+{
+       return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
+}
+
+static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
+                                  unsigned int slen, u8 *dst,
+                                  unsigned int *dlen)
+{
+       return __lz4hc_decompress_crypto(src, slen, dst, dlen, NULL);
+}
+
 static struct crypto_alg alg_lz4hc = {
        .cra_name               = "lz4hc",
        .cra_flags              = CRYPTO_ALG_TYPE_COMPRESS,
@@ -89,14 +136,39 @@ static struct crypto_alg alg_lz4hc = {
        .coa_decompress         = lz4hc_decompress_crypto } }
 };
 
+static struct scomp_alg scomp = {
+       .alloc_ctx              = lz4hc_alloc_ctx,
+       .free_ctx               = lz4hc_free_ctx,
+       .compress               = lz4hc_scompress,
+       .decompress             = lz4hc_sdecompress,
+       .base                   = {
+               .cra_name       = "lz4hc",
+               .cra_driver_name = "lz4hc-scomp",
+               .cra_module      = THIS_MODULE,
+       }
+};
+
 static int __init lz4hc_mod_init(void)
 {
-       return crypto_register_alg(&alg_lz4hc);
+       int ret;
+
+       ret = crypto_register_alg(&alg_lz4hc);
+       if (ret)
+               return ret;
+
+       ret = crypto_register_scomp(&scomp);
+       if (ret) {
+               crypto_unregister_alg(&alg_lz4hc);
+               return ret;
+       }
+
+       return ret;
 }
 
 static void __exit lz4hc_mod_fini(void)
 {
        crypto_unregister_alg(&alg_lz4hc);
+       crypto_unregister_scomp(&scomp);
 }
 
 module_init(lz4hc_mod_init);