crypto: acomp - add support for lz4 via scomp (8cd9330e) · Commits · 戴 / test

crypto/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

crypto/lz4.c

+81 −10

Original line number	Diff line number	Diff line
		@@ -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,
		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);

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