crypto: Add zstd support

Adds zstd support to crypto and scompress. Only supports the default
level.

Previously we held off on this patch, since there weren't any users.
Now zram is ready for zstd support, but depends on CONFIG_CRYPTO_ZSTD,
which isn't defined until this patch is in. I also see a patch adding
zstd to pstore [0], which depends on crypto zstd.

[0] lkml.kernel.org/r/9c9416b2dff19f05fb4c35879aaa83d11ff72c92.1521626182.git.geliangtang@gmail.com

Signed-off-by: Nick Terrell <terrelln@fb.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

[dwoo08.lee: backport upstream commit d28fc3dbe191 for applying zstd to zram]
Signed-off-by: Dongwoo Lee <dwoo08.lee@samsung.com>

Change-Id: I27969ec0cda2a6f6280ef6a10ee5cc33938032d1

5 files changed, 356 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index f6cad6e1a6d4..3bb9219934a2 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1626,6 +1626,15 @@ config CRYPTO_LZ4HC
 	help
 	  This is the LZ4 high compression mode algorithm.
 
+config CRYPTO_ZSTD
+	tristate "Zstd compression algorithm"
+	select CRYPTO_ALGAPI
+	select CRYPTO_ACOMP2
+	select ZSTD_COMPRESS
+	select ZSTD_DECOMPRESS
+	help
+	  This is the zstd algorithm.
+
 comment "Random Number Generation"
 
 config CRYPTO_ANSI_CPRNG
diff --git a/crypto/Makefile b/crypto/Makefile
index 6658a3459bc3..070ba4bd12ba 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -136,6 +136,7 @@ obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o
 obj-$(CONFIG_CRYPTO_USER_API_RNG) += algif_rng.o
 obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o
 obj-$(CONFIG_CRYPTO_DISKCIPHER) += diskcipher.o
+obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o
 
 #
 # generic algorithms and the async_tx api
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 92a6b549a27d..28ddd5e7b9bb 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -4253,6 +4253,16 @@ static const struct alg_test_desc alg_test_descs[] = {
 				}
 			}
 		}
+	}, {
+		.alg = "zstd",
+		.test = alg_test_comp,
+		.fips_allowed = 1,
+		.suite = {
+			.comp = {
+				.comp = __VECS(zstd_comp_tv_template),
+				.decomp = __VECS(zstd_decomp_tv_template)
+			}
+		}
 	}
 };
 
diff --git a/crypto/testmgr.h b/crypto/testmgr.h
index 9033088ca231..6bf9b8f453eb 100644
--- a/crypto/testmgr.h
+++ b/crypto/testmgr.h
@@ -34545,4 +34545,75 @@ static struct comp_testvec lz4hc_decomp_tv_template[] = {
 	},
 };
 
+static const struct comp_testvec zstd_comp_tv_template[] = {
+	{
+		.inlen	= 68,
+		.outlen	= 39,
+		.input	= "The algorithm is zstd. "
+			  "The algorithm is zstd. "
+			  "The algorithm is zstd.",
+		.output	= "\x28\xb5\x2f\xfd\x00\x50\xf5\x00\x00\xb8\x54\x68\x65"
+			  "\x20\x61\x6c\x67\x6f\x72\x69\x74\x68\x6d\x20\x69\x73"
+			  "\x20\x7a\x73\x74\x64\x2e\x20\x01\x00\x55\x73\x36\x01"
+			  ,
+	},
+	{
+		.inlen	= 244,
+		.outlen	= 151,
+		.input	= "zstd, short for Zstandard, is a fast lossless "
+			  "compression algorithm, targeting real-time "
+			  "compression scenarios at zlib-level and better "
+			  "compression ratios. The zstd compression library "
+			  "provides in-memory compression and decompression "
+			  "functions.",
+		.output	= "\x28\xb5\x2f\xfd\x00\x50\x75\x04\x00\x42\x4b\x1e\x17"
+			  "\x90\x81\x31\x00\xf2\x2f\xe4\x36\xc9\xef\x92\x88\x32"
+			  "\xc9\xf2\x24\x94\xd8\x68\x9a\x0f\x00\x0c\xc4\x31\x6f"
+			  "\x0d\x0c\x38\xac\x5c\x48\x03\xcd\x63\x67\xc0\xf3\xad"
+			  "\x4e\x90\xaa\x78\xa0\xa4\xc5\x99\xda\x2f\xb6\x24\x60"
+			  "\xe2\x79\x4b\xaa\xb6\x6b\x85\x0b\xc9\xc6\x04\x66\x86"
+			  "\xe2\xcc\xe2\x25\x3f\x4f\x09\xcd\xb8\x9d\xdb\xc1\x90"
+			  "\xa9\x11\xbc\x35\x44\x69\x2d\x9c\x64\x4f\x13\x31\x64"
+			  "\xcc\xfb\x4d\x95\x93\x86\x7f\x33\x7f\x1a\xef\xe9\x30"
+			  "\xf9\x67\xa1\x94\x0a\x69\x0f\x60\xcd\xc3\xab\x99\xdc"
+			  "\x42\xed\x97\x05\x00\x33\xc3\x15\x95\x3a\x06\xa0\x0e"
+			  "\x20\xa9\x0e\x82\xb9\x43\x45\x01",
+	},
+};
+
+static const struct comp_testvec zstd_decomp_tv_template[] = {
+	{
+		.inlen	= 43,
+		.outlen	= 68,
+		.input	= "\x28\xb5\x2f\xfd\x04\x50\xf5\x00\x00\xb8\x54\x68\x65"
+			  "\x20\x61\x6c\x67\x6f\x72\x69\x74\x68\x6d\x20\x69\x73"
+			  "\x20\x7a\x73\x74\x64\x2e\x20\x01\x00\x55\x73\x36\x01"
+			  "\x6b\xf4\x13\x35",
+		.output	= "The algorithm is zstd. "
+			  "The algorithm is zstd. "
+			  "The algorithm is zstd.",
+	},
+	{
+		.inlen	= 155,
+		.outlen	= 244,
+		.input	= "\x28\xb5\x2f\xfd\x04\x50\x75\x04\x00\x42\x4b\x1e\x17"
+			  "\x90\x81\x31\x00\xf2\x2f\xe4\x36\xc9\xef\x92\x88\x32"
+			  "\xc9\xf2\x24\x94\xd8\x68\x9a\x0f\x00\x0c\xc4\x31\x6f"
+			  "\x0d\x0c\x38\xac\x5c\x48\x03\xcd\x63\x67\xc0\xf3\xad"
+			  "\x4e\x90\xaa\x78\xa0\xa4\xc5\x99\xda\x2f\xb6\x24\x60"
+			  "\xe2\x79\x4b\xaa\xb6\x6b\x85\x0b\xc9\xc6\x04\x66\x86"
+			  "\xe2\xcc\xe2\x25\x3f\x4f\x09\xcd\xb8\x9d\xdb\xc1\x90"
+			  "\xa9\x11\xbc\x35\x44\x69\x2d\x9c\x64\x4f\x13\x31\x64"
+			  "\xcc\xfb\x4d\x95\x93\x86\x7f\x33\x7f\x1a\xef\xe9\x30"
+			  "\xf9\x67\xa1\x94\x0a\x69\x0f\x60\xcd\xc3\xab\x99\xdc"
+			  "\x42\xed\x97\x05\x00\x33\xc3\x15\x95\x3a\x06\xa0\x0e"
+			  "\x20\xa9\x0e\x82\xb9\x43\x45\x01\xaa\x6d\xda\x0d",
+		.output	= "zstd, short for Zstandard, is a fast lossless "
+			  "compression algorithm, targeting real-time "
+			  "compression scenarios at zlib-level and better "
+			  "compression ratios. The zstd compression library "
+			  "provides in-memory compression and decompression "
+			  "functions.",
+	},
+};
 #endif	/* _CRYPTO_TESTMGR_H */
diff --git a/crypto/zstd.c b/crypto/zstd.c
new file mode 100644
index 000000000000..9a76b3ed8b8b
--- /dev/null
+++ b/crypto/zstd.c
@@ -0,0 +1,265 @@
+/*
+ * Cryptographic API.
+ *
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+#include <linux/crypto.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/vmalloc.h>
+#include <linux/zstd.h>
+#include <crypto/internal/scompress.h>
+
+
+#define ZSTD_DEF_LEVEL	3
+
+struct zstd_ctx {
+	ZSTD_CCtx *cctx;
+	ZSTD_DCtx *dctx;
+	void *cwksp;
+	void *dwksp;
+};
+
+static ZSTD_parameters zstd_params(void)
+{
+	return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0);
+}
+
+static int zstd_comp_init(struct zstd_ctx *ctx)
+{
+	int ret = 0;
+	const ZSTD_parameters params = zstd_params();
+	const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams);
+
+	ctx->cwksp = vzalloc(wksp_size);
+	if (!ctx->cwksp) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size);
+	if (!ctx->cctx) {
+		ret = -EINVAL;
+		goto out_free;
+	}
+out:
+	return ret;
+out_free:
+	vfree(ctx->cwksp);
+	goto out;
+}
+
+static int zstd_decomp_init(struct zstd_ctx *ctx)
+{
+	int ret = 0;
+	const size_t wksp_size = ZSTD_DCtxWorkspaceBound();
+
+	ctx->dwksp = vzalloc(wksp_size);
+	if (!ctx->dwksp) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size);
+	if (!ctx->dctx) {
+		ret = -EINVAL;
+		goto out_free;
+	}
+out:
+	return ret;
+out_free:
+	vfree(ctx->dwksp);
+	goto out;
+}
+
+static void zstd_comp_exit(struct zstd_ctx *ctx)
+{
+	vfree(ctx->cwksp);
+	ctx->cwksp = NULL;
+	ctx->cctx = NULL;
+}
+
+static void zstd_decomp_exit(struct zstd_ctx *ctx)
+{
+	vfree(ctx->dwksp);
+	ctx->dwksp = NULL;
+	ctx->dctx = NULL;
+}
+
+static int __zstd_init(void *ctx)
+{
+	int ret;
+
+	ret = zstd_comp_init(ctx);
+	if (ret)
+		return ret;
+	ret = zstd_decomp_init(ctx);
+	if (ret)
+		zstd_comp_exit(ctx);
+	return ret;
+}
+
+static void *zstd_alloc_ctx(struct crypto_scomp *tfm)
+{
+	int ret;
+	struct zstd_ctx *ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	ret = __zstd_init(ctx);
+	if (ret) {
+		kfree(ctx);
+		return ERR_PTR(ret);
+	}
+
+	return ctx;
+}
+
+static int zstd_init(struct crypto_tfm *tfm)
+{
+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	return __zstd_init(ctx);
+}
+
+static void __zstd_exit(void *ctx)
+{
+	zstd_comp_exit(ctx);
+	zstd_decomp_exit(ctx);
+}
+
+static void zstd_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+	__zstd_exit(ctx);
+	kzfree(ctx);
+}
+
+static void zstd_exit(struct crypto_tfm *tfm)
+{
+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	__zstd_exit(ctx);
+}
+
+static int __zstd_compress(const u8 *src, unsigned int slen,
+			   u8 *dst, unsigned int *dlen, void *ctx)
+{
+	size_t out_len;
+	struct zstd_ctx *zctx = ctx;
+	const ZSTD_parameters params = zstd_params();
+
+	out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params);
+	if (ZSTD_isError(out_len))
+		return -EINVAL;
+	*dlen = out_len;
+	return 0;
+}
+
+static int zstd_compress(struct crypto_tfm *tfm, const u8 *src,
+			 unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	return __zstd_compress(src, slen, dst, dlen, ctx);
+}
+
+static int zstd_scompress(struct crypto_scomp *tfm, const u8 *src,
+			  unsigned int slen, u8 *dst, unsigned int *dlen,
+			  void *ctx)
+{
+	return __zstd_compress(src, slen, dst, dlen, ctx);
+}
+
+static int __zstd_decompress(const u8 *src, unsigned int slen,
+			     u8 *dst, unsigned int *dlen, void *ctx)
+{
+	size_t out_len;
+	struct zstd_ctx *zctx = ctx;
+
+	out_len = ZSTD_decompressDCtx(zctx->dctx, dst, *dlen, src, slen);
+	if (ZSTD_isError(out_len))
+		return -EINVAL;
+	*dlen = out_len;
+	return 0;
+}
+
+static int zstd_decompress(struct crypto_tfm *tfm, const u8 *src,
+			   unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	return __zstd_decompress(src, slen, dst, dlen, ctx);
+}
+
+static int zstd_sdecompress(struct crypto_scomp *tfm, const u8 *src,
+			    unsigned int slen, u8 *dst, unsigned int *dlen,
+			    void *ctx)
+{
+	return __zstd_decompress(src, slen, dst, dlen, ctx);
+}
+
+static struct crypto_alg alg = {
+	.cra_name		= "zstd",
+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
+	.cra_ctxsize		= sizeof(struct zstd_ctx),
+	.cra_module		= THIS_MODULE,
+	.cra_init		= zstd_init,
+	.cra_exit		= zstd_exit,
+	.cra_u			= { .compress = {
+	.coa_compress		= zstd_compress,
+	.coa_decompress		= zstd_decompress } }
+};
+
+static struct scomp_alg scomp = {
+	.alloc_ctx		= zstd_alloc_ctx,
+	.free_ctx		= zstd_free_ctx,
+	.compress		= zstd_scompress,
+	.decompress		= zstd_sdecompress,
+	.base			= {
+		.cra_name	= "zstd",
+		.cra_driver_name = "zstd-scomp",
+		.cra_module	 = THIS_MODULE,
+	}
+};
+
+static int __init zstd_mod_init(void)
+{
+	int ret;
+
+	ret = crypto_register_alg(&alg);
+	if (ret)
+		return ret;
+
+	ret = crypto_register_scomp(&scomp);
+	if (ret)
+		crypto_unregister_alg(&alg);
+
+	return ret;
+}
+
+static void __exit zstd_mod_fini(void)
+{
+	crypto_unregister_alg(&alg);
+	crypto_unregister_scomp(&scomp);
+}
+
+module_init(zstd_mod_init);
+module_exit(zstd_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Zstd Compression Algorithm");
+MODULE_ALIAS_CRYPTO("zstd");