[PATCH v6 0/8] crypto: asynchronous compression api

[PATCH v6 0/8] crypto: asynchronous compression api

[Giovanni Cabiddu]

The following patch set introduces acomp, a generic asynchronous
(de)compression api with support for SG lists.
We propose a new crypto type called crypto_acomp_type, a new struct acomp_alg
and struct crypto_acomp, together with number of helper functions to register
acomp type algorithms and allocate tfm instances.
This interface will allow the following operations:

    int (*compress)(struct acomp_req *req);
    int (*decompress)(struct acomp_req *req);

Together with acomp we propose a new driver-side interface, scomp, which
handles compression implementations which use linear buffers. We converted all
compression algorithms available in LKCF to use this interface so that those
algorithms will be accessible through the acomp api.

Changes in v6:
    - changed acomp_request_alloc prototype by removing gfp parameter,
      acomp_request_alloc will always use GFP_KERNEL

Changes in v5:
    - removed qdecompress api, no longer needed
    - removed produced and consumed counters in acomp_req
    - added crypto_has_acomp function 

Changes in v4:
    - added qdecompress api, a front-end for decompression algorithms which
      do not need additional vmalloc work space

Changes in v3:
    - added driver-side scomp interface
    - provided support for lzo, lz4, lz4hc, 842, deflate compression algorithms
      via the acomp api (through scomp)
    - extended testmgr to support acomp
    - removed extended acomp api for supporting deflate algorithm parameters
      (will be enhanced and re-proposed in future)
Note that (2) to (7) are a rework of Joonsoo Kim's scomp patches.

Changes in v2:
    - added compression and decompression request sizes in acomp_alg
      in order to enable noctx support
    - extended api with helpers to allocate compression and
      decompression requests

Changes from initial submit:
    - added consumed and produced fields to acomp_req
    - extended api to support configuration of deflate compressors

---
Giovanni Cabiddu (8):
  crypto: add asynchronous compression api
  crypto: add driver-side scomp interface
  crypto: acomp - add support for lzo via scomp
  crypto: acomp - add support for lz4 via scomp
  crypto: acomp - add support for lz4hc via scomp
  crypto: acomp - add support for 842 via scomp
  crypto: acomp - add support for deflate via scomp
  crypto: acomp - update testmgr with support for acomp

 crypto/842.c                        |   82 +++++++++++-
 crypto/Kconfig                      |   15 ++
 crypto/Makefile                     |    3 +
 crypto/acompress.c                  |  163 ++++++++++++++++++++++
 crypto/crypto_user.c                |   21 +++
 crypto/deflate.c                    |  111 ++++++++++++++--
 crypto/lz4.c                        |   91 +++++++++++--
 crypto/lz4hc.c                      |   92 +++++++++++--
 crypto/lzo.c                        |   97 +++++++++++--
 crypto/scompress.c                  |  252 ++++++++++++++++++++++++++++++++++
 crypto/testmgr.c                    |  158 ++++++++++++++++++++--
 include/crypto/acompress.h          |  253 +++++++++++++++++++++++++++++++++++
 include/crypto/internal/acompress.h |   81 +++++++++++
 include/crypto/internal/scompress.h |  134 ++++++++++++++++++
 include/linux/crypto.h              |    3 +
 15 files changed, 1495 insertions(+), 61 deletions(-)
 create mode 100644 crypto/acompress.c
 create mode 100644 crypto/scompress.c
 create mode 100644 include/crypto/acompress.h
 create mode 100644 include/crypto/internal/acompress.h
 create mode 100644 include/crypto/internal/scompress.h

-- 
1.7.4.1

[PATCH v6 1/8] crypto: add asynchronous compression api

[Giovanni Cabiddu]

This patch introduces acomp, an asynchronous compression api that uses
scatterlist buffers.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/Kconfig                      |   10 ++
 crypto/Makefile                     |    2 +
 crypto/acompress.c                  |  118 ++++++++++++++++
 crypto/crypto_user.c                |   21 +++
 include/crypto/acompress.h          |  261 +++++++++++++++++++++++++++++++++++
 include/crypto/internal/acompress.h |   66 +++++++++
 include/linux/crypto.h              |    1 +
 7 files changed, 479 insertions(+), 0 deletions(-)
 create mode 100644 crypto/acompress.c
 create mode 100644 include/crypto/acompress.h
 create mode 100644 include/crypto/internal/acompress.h

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 1d33beb..24fef55 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -93,6 +93,15 @@ config CRYPTO_AKCIPHER
 	select CRYPTO_AKCIPHER2
 	select CRYPTO_ALGAPI
 
+config CRYPTO_ACOMP
+	tristate
+	select CRYPTO_ACOMP2
+	select CRYPTO_ALGAPI
+
+config CRYPTO_ACOMP2
+	tristate
+	select CRYPTO_ALGAPI2
+
 config CRYPTO_RSA
 	tristate "RSA algorithm"
 	select CRYPTO_AKCIPHER
@@ -115,6 +124,7 @@ config CRYPTO_MANAGER2
 	select CRYPTO_HASH2
 	select CRYPTO_BLKCIPHER2
 	select CRYPTO_AKCIPHER2
+	select CRYPTO_ACOMP2
 
 config CRYPTO_USER
 	tristate "Userspace cryptographic algorithm configuration"
diff --git a/crypto/Makefile b/crypto/Makefile
index 4f4ef7e..e817b38 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -31,6 +31,8 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
 
 obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
 
+obj-$(CONFIG_CRYPTO_ACOMP2) += acompress.o
+
 $(obj)/rsapubkey-asn1.o: $(obj)/rsapubkey-asn1.c $(obj)/rsapubkey-asn1.h
 $(obj)/rsaprivkey-asn1.o: $(obj)/rsaprivkey-asn1.c $(obj)/rsaprivkey-asn1.h
 clean-files += rsapubkey-asn1.c rsapubkey-asn1.h
diff --git a/crypto/acompress.c b/crypto/acompress.c
new file mode 100644
index 0000000..f24fef3
--- /dev/null
+++ b/crypto/acompress.c
@@ -0,0 +1,118 @@
+/*
+ * Asynchronous Compression operations
+ *
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Weigang Li <weigang.li@intel.com>
+ *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
+#include <crypto/internal/acompress.h>
+#include "internal.h"
+
+#ifdef CONFIG_NET
+static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	struct crypto_report_comp racomp;
+
+	strncpy(racomp.type, "acomp", sizeof(racomp.type));
+
+	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
+		    sizeof(struct crypto_report_comp), &racomp))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+#else
+static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	return -ENOSYS;
+}
+#endif
+
+static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
+	__attribute__ ((unused));
+
+static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	seq_puts(m, "type         : acomp\n");
+}
+
+static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
+{
+	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
+	struct acomp_alg *alg = crypto_acomp_alg(acomp);
+
+	alg->exit(acomp);
+}
+
+static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
+{
+	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
+	struct acomp_alg *alg = crypto_acomp_alg(acomp);
+
+	if (alg->exit)
+		acomp->base.exit = crypto_acomp_exit_tfm;
+
+	if (alg->init)
+		return alg->init(acomp);
+
+	return 0;
+}
+
+static const struct crypto_type crypto_acomp_type = {
+	.extsize = crypto_alg_extsize,
+	.init_tfm = crypto_acomp_init_tfm,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_acomp_show,
+#endif
+	.report = crypto_acomp_report,
+	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
+	.tfmsize = offsetof(struct crypto_acomp, base),
+};
+
+struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
+					u32 mask)
+{
+	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
+
+int crypto_register_acomp(struct acomp_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+
+	base->cra_type = &crypto_acomp_type;
+	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
+
+	return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_acomp);
+
+int crypto_unregister_acomp(struct acomp_alg *alg)
+{
+	return crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Asynchronous compression type");
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index f71960d..80401d9 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -111,6 +111,21 @@ nla_put_failure:
 	return -EMSGSIZE;
 }
 
+static int crypto_report_acomp(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	struct crypto_report_acomp racomp;
+
+	strncpy(racomp.type, "acomp", sizeof(racomp.type));
+
+	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMPRESS,
+		    sizeof(struct crypto_report_acomp), &racomp))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
 static int crypto_report_akcipher(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	struct crypto_report_akcipher rakcipher;
@@ -171,6 +186,12 @@ static int crypto_report_one(struct crypto_alg *alg,
 
 		break;
 
+	case CRYPTO_ALG_TYPE_ACOMPRESS:
+		if (crypto_report_acomp(skb, alg))
+			goto nla_put_failure;
+
+		break;
+
 	case CRYPTO_ALG_TYPE_AKCIPHER:
 		if (crypto_report_akcipher(skb, alg))
 			goto nla_put_failure;
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
new file mode 100644
index 0000000..f4e2f96
--- /dev/null
+++ b/include/crypto/acompress.h
@@ -0,0 +1,261 @@
+/*
+ * Asynchronous Compression operations
+ *
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Weigang Li <weigang.li@intel.com>
+ *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#ifndef _CRYPTO_ACOMP_H
+#define _CRYPTO_ACOMP_H
+#include <linux/crypto.h>
+
+/**
+ * struct acomp_req - asynchronous (de)compression request
+ *
+ * @base:     Common attributes for asynchronous crypto requests
+ * @src:      Source Data
+ * @dst:      Destination data
+ * @slen:     Size of the input buffer
+ * @dlen:     Size of the output buffer and number of bytes produced
+ * @__ctx:    Start of private context data
+ */
+struct acomp_req {
+	struct crypto_async_request base;
+	struct scatterlist *src;
+	struct scatterlist *dst;
+	unsigned int slen;
+	unsigned int dlen;
+	void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+/**
+ * struct crypto_acomp - user-instantiated objects which encapsulate
+ * algorithms and core processing logic
+ *
+ * @base: Common crypto API algorithm data structure
+ */
+struct crypto_acomp {
+	struct crypto_tfm base;
+};
+
+/**
+ * struct acomp_alg - asynchronous compression algorithm
+ *
+ * @compress:	Function performs a compress operation
+ * @decompress:	Function performs a de-compress operation
+ * @init:	Initialize the cryptographic transformation object.
+ *		This function is used to initialize the cryptographic
+ *		transformation object. This function is called only once at
+ *		the instantiation time, right after the transformation context
+ *		was allocated. In case the cryptographic hardware has some
+ *		special requirements which need to be handled by software, this
+ *		function shall check for the precise requirement of the
+ *		transformation and put any software fallbacks in place.
+ * @exit:	Deinitialize the cryptographic transformation object. This is a
+ *		counterpart to @init, used to remove various changes set in
+ *		@init.
+ *
+ * @reqsize:	Context size for (de)compression requests
+ * @base:	Common crypto API algorithm data structure
+ */
+struct acomp_alg {
+	int (*compress)(struct acomp_req *req);
+	int (*decompress)(struct acomp_req *req);
+	int (*init)(struct crypto_acomp *tfm);
+	void (*exit)(struct crypto_acomp *tfm);
+	unsigned int reqsize;
+	struct crypto_alg base;
+};
+
+/**
+ * DOC: Asynchronous Compression API
+ *
+ * The Asynchronous Compression API is used with the algorithms of type
+ * CRYPTO_ALG_TYPE_ACOMPRESS (listed as type "acomp" in /proc/crypto)
+ */
+
+/**
+ * crypto_alloc_acomp() -- allocate ACOMPRESS tfm handle
+ * @alg_name: is the cra_name / name or cra_driver_name / driver name of the
+ *	      compression algorithm e.g. "deflate"
+ * @type: specifies the type of the algorithm
+ * @mask: specifies the mask for the algorithm
+ *
+ * Allocate a handle for a compression algorithm. The returned struct
+ * crypto_acomp is the handle that is required for any subsequent
+ * API invocation for the compression operations.
+ *
+ * Return: allocated handle in case of success; IS_ERR() is true in case
+ *	   of an error, PTR_ERR() returns the error code.
+ */
+struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
+					u32 mask);
+
+static inline struct crypto_tfm *crypto_acomp_tfm(struct crypto_acomp *tfm)
+{
+	return &tfm->base;
+}
+
+static inline struct acomp_alg *__crypto_acomp_alg(struct crypto_alg *alg)
+{
+	return container_of(alg, struct acomp_alg, base);
+}
+
+static inline struct crypto_acomp *__crypto_acomp_tfm(struct crypto_tfm *tfm)
+{
+	return container_of(tfm, struct crypto_acomp, base);
+}
+
+static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
+{
+	return __crypto_acomp_alg(crypto_acomp_tfm(tfm)->__crt_alg);
+}
+
+static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
+{
+	return crypto_acomp_alg(tfm)->reqsize;
+}
+
+static inline void acomp_request_set_tfm(struct acomp_req *req,
+					 struct crypto_acomp *tfm)
+{
+	req->base.tfm = crypto_acomp_tfm(tfm);
+}
+
+static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
+{
+	return __crypto_acomp_tfm(req->base.tfm);
+}
+
+/**
+ * crypto_free_acomp() -- free ACOMPRESS tfm handle
+ *
+ * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
+ */
+static inline void crypto_free_acomp(struct crypto_acomp *tfm)
+{
+	crypto_destroy_tfm(tfm, crypto_acomp_tfm(tfm));
+}
+
+static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask)
+{
+	type &= ~CRYPTO_ALG_TYPE_MASK;
+	type |= CRYPTO_ALG_TYPE_ACOMPRESS;
+	mask |= CRYPTO_ALG_TYPE_MASK;
+
+	return crypto_has_alg(alg_name, type, mask);
+}
+
+/**
+ * acomp_request_alloc() -- allocates asynchronous (de)compression request
+ *
+ * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
+ *
+ * Return: allocated handle in case of success or NULL in case of an error.
+ */
+static inline struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm)
+{
+	struct acomp_req *req;
+
+	req = kzalloc(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
+	if (likely(req))
+		acomp_request_set_tfm(req, tfm);
+
+	return req;
+}
+
+/**
+ * acomp_request_free() -- zeroize and free asynchronous (de)compression request
+ *
+ * @req: request to free
+ */
+static inline void acomp_request_free(struct acomp_req *req)
+{
+	kzfree(req);
+}
+
+/**
+ * acomp_request_set_callback() -- Sets an asynchronous callback
+ *
+ * Callback will be called when an asynchronous operation on a given
+ * request is finished.
+ *
+ * @req:  request that the callback will be set for
+ * @flgs: specify for instance if the operation may backlog
+ * @cmlp: callback which will be called
+ * @data: private data used by the caller
+ */
+static inline void acomp_request_set_callback(struct acomp_req *req,
+					      u32 flgs,
+					      crypto_completion_t cmpl,
+					      void *data)
+{
+	req->base.complete = cmpl;
+	req->base.data = data;
+	req->base.flags = flgs;
+}
+
+/**
+ * acomp_request_set_params() -- Sets request parameters
+ *
+ * Sets parameters required by an acomp operation
+ *
+ * @req:  asynchronous compress request
+ * @src:  pointer to input buffer scatterlist
+ * @dst:  pointer to output buffer scatterlist
+ * @slen: size of the input buffer
+ * @dlen: size of the output buffer
+ */
+static inline void acomp_request_set_params(struct acomp_req *req,
+					    struct scatterlist *src,
+					    struct scatterlist *dst,
+					    unsigned int slen,
+					    unsigned int dlen)
+{
+	req->src = src;
+	req->dst = dst;
+	req->slen = slen;
+	req->dlen = dlen;
+}
+
+/**
+ * crypto_acomp_compress() -- Invoke asynchronous compress operation
+ *
+ * Function invokes the asynchronous compress operation
+ *
+ * @req: asynchronous compress request
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_acomp_compress(struct acomp_req *req)
+{
+	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
+	struct acomp_alg *alg = crypto_acomp_alg(tfm);
+
+	return alg->compress(req);
+}
+
+/**
+ * crypto_acomp_decompress() -- Invoke asynchronous decompress operation
+ *
+ * Function invokes the asynchronous decompress operation
+ *
+ * @req: asynchronous compress request
+ *
+ * Return: zero on success; error code in case of error
+ */
+static inline int crypto_acomp_decompress(struct acomp_req *req)
+{
+	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
+	struct acomp_alg *alg = crypto_acomp_alg(tfm);
+
+	return alg->decompress(req);
+}
+
+#endif
diff --git a/include/crypto/internal/acompress.h b/include/crypto/internal/acompress.h
new file mode 100644
index 0000000..294f2ee
--- /dev/null
+++ b/include/crypto/internal/acompress.h
@@ -0,0 +1,66 @@
+/*
+ * Asynchronous Compression operations
+ *
+ * Copyright (c) 2016, Intel Corporation
+ * Authors: Weigang Li <weigang.li@intel.com>
+ *          Giovanni Cabiddu <giovanni.cabiddu@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#ifndef _CRYPTO_ACOMP_INT_H
+#define _CRYPTO_ACOMP_INT_H
+#include <crypto/acompress.h>
+
+/*
+ * Transform internal helpers.
+ */
+static inline void *acomp_request_ctx(struct acomp_req *req)
+{
+	return req->__ctx;
+}
+
+static inline void *acomp_tfm_ctx(struct crypto_acomp *tfm)
+{
+	return tfm->base.__crt_ctx;
+}
+
+static inline void acomp_request_complete(struct acomp_req *req,
+					  int err)
+{
+	req->base.complete(&req->base, err);
+}
+
+static inline const char *acomp_alg_name(struct crypto_acomp *tfm)
+{
+	return crypto_acomp_tfm(tfm)->__crt_alg->cra_name;
+}
+
+/**
+ * crypto_register_acomp() -- Register asynchronous compression algorithm
+ *
+ * Function registers an implementation of an asynchronous
+ * compression algorithm
+ *
+ * @alg:   algorithm definition
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_register_acomp(struct acomp_alg *alg);
+
+/**
+ * crypto_unregister_acomp() -- Unregister asynchronous compression algorithm
+ *
+ * Function unregisters an implementation of an asynchronous
+ * compression algorithm
+ *
+ * @alg:   algorithm definition
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_unregister_acomp(struct acomp_alg *alg);
+
+#endif
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index d844cbc..7987323 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -48,6 +48,7 @@
 #define CRYPTO_ALG_TYPE_BLKCIPHER	0x00000004
 #define CRYPTO_ALG_TYPE_ABLKCIPHER	0x00000005
 #define CRYPTO_ALG_TYPE_GIVCIPHER	0x00000006
+#define CRYPTO_ALG_TYPE_ACOMPRESS	0x00000008
 #define CRYPTO_ALG_TYPE_RNG		0x0000000c
 #define CRYPTO_ALG_TYPE_AKCIPHER	0x0000000d
 #define CRYPTO_ALG_TYPE_DIGEST		0x0000000e
-- 
1.7.4.1

[PATCH v6 2/8] crypto: add driver-side scomp interface

[Giovanni Cabiddu]

Add a synchronous back-end (scomp) to acomp. This allows to easily expose
the already present compression algorithms in LKCF via acomp

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/Makefile                     |    1 +
 crypto/acompress.c                  |   49 +++++++-
 crypto/scompress.c                  |  252 +++++++++++++++++++++++++++++++++++
 include/crypto/acompress.h          |   32 ++---
 include/crypto/internal/acompress.h |   15 ++
 include/crypto/internal/scompress.h |  134 +++++++++++++++++++
 include/linux/crypto.h              |    2 +
 7 files changed, 463 insertions(+), 22 deletions(-)
 create mode 100644 crypto/scompress.c
 create mode 100644 include/crypto/internal/scompress.h

diff --git a/crypto/Makefile b/crypto/Makefile
index e817b38..fc8fcfe 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_CRYPTO_HASH2) += crypto_hash.o
 obj-$(CONFIG_CRYPTO_AKCIPHER2) += akcipher.o
 
 obj-$(CONFIG_CRYPTO_ACOMP2) += acompress.o
+obj-$(CONFIG_CRYPTO_ACOMP2) += scompress.o
 
 $(obj)/rsapubkey-asn1.o: $(obj)/rsapubkey-asn1.c $(obj)/rsapubkey-asn1.h
 $(obj)/rsaprivkey-asn1.o: $(obj)/rsaprivkey-asn1.c $(obj)/rsaprivkey-asn1.h
diff --git a/crypto/acompress.c b/crypto/acompress.c
index f24fef3..a5e6cf1 100644
--- a/crypto/acompress.c
+++ b/crypto/acompress.c
@@ -22,8 +22,11 @@
 #include <linux/cryptouser.h>
 #include <net/netlink.h>
 #include <crypto/internal/acompress.h>
+#include <crypto/internal/scompress.h>
 #include "internal.h"
 
+static const struct crypto_type crypto_acomp_type;
+
 #ifdef CONFIG_NET
 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
@@ -67,6 +70,13 @@ static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
 	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
 	struct acomp_alg *alg = crypto_acomp_alg(acomp);
 
+	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
+		return crypto_init_scomp_ops_async(tfm);
+
+	acomp->compress = alg->compress;
+	acomp->decompress = alg->decompress;
+	acomp->reqsize = alg->reqsize;
+
 	if (alg->exit)
 		acomp->base.exit = crypto_acomp_exit_tfm;
 
@@ -76,15 +86,25 @@ static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
 	return 0;
 }
 
+unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
+{
+	int extsize = crypto_alg_extsize(alg);
+
+	if (alg->cra_type != &crypto_acomp_type)
+		extsize += sizeof(struct crypto_scomp *);
+
+	return extsize;
+}
+
 static const struct crypto_type crypto_acomp_type = {
-	.extsize = crypto_alg_extsize,
+	.extsize = crypto_acomp_extsize,
 	.init_tfm = crypto_acomp_init_tfm,
 #ifdef CONFIG_PROC_FS
 	.show = crypto_acomp_show,
 #endif
 	.report = crypto_acomp_report,
 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
-	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
 	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
 	.tfmsize = offsetof(struct crypto_acomp, base),
 };
@@ -96,6 +116,31 @@ struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
 
+struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
+{
+	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
+	struct acomp_req *req;
+
+	req = __acomp_request_alloc(acomp);
+	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
+		return crypto_acomp_scomp_alloc_ctx(req);
+
+	return req;
+}
+EXPORT_SYMBOL_GPL(acomp_request_alloc);
+
+void acomp_request_free(struct acomp_req *req)
+{
+	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
+	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
+
+	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
+		crypto_acomp_scomp_free_ctx(req);
+
+	__acomp_request_free(req);
+}
+EXPORT_SYMBOL_GPL(acomp_request_free);
+
 int crypto_register_acomp(struct acomp_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;
diff --git a/crypto/scompress.c b/crypto/scompress.c
new file mode 100644
index 0000000..850b427
--- /dev/null
+++ b/crypto/scompress.c
@@ -0,0 +1,252 @@
+/*
+ * Synchronous Compression operations
+ *
+ * Copyright 2015 LG Electronics Inc.
+ * Copyright (c) 2016, Intel Corporation
+ * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <linux/cryptouser.h>
+#include <net/netlink.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/internal/acompress.h>
+#include <crypto/internal/scompress.h>
+#include "internal.h"
+
+static const struct crypto_type crypto_scomp_type;
+
+#ifdef CONFIG_NET
+static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	struct crypto_report_comp rscomp;
+
+	strncpy(rscomp.type, "scomp", sizeof(rscomp.type));
+
+	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
+		    sizeof(struct crypto_report_comp), &rscomp))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+#else
+static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
+{
+	return -ENOSYS;
+}
+#endif
+
+static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
+	__attribute__ ((unused));
+
+static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
+{
+	seq_puts(m, "type         : scomp\n");
+}
+
+static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
+{
+	return 0;
+}
+
+static void *scomp_map(struct scatterlist *sg, unsigned int len,
+		       gfp_t gfp_flags)
+{
+	void *buf;
+
+	if (sg_is_last(sg))
+		return kmap_atomic(sg_page(sg)) + sg->offset;
+
+	buf = kmalloc(len, gfp_flags);
+	if (!buf)
+		return NULL;
+
+	scatterwalk_map_and_copy(buf, sg, 0, len, 0);
+
+	return buf;
+}
+
+static void scomp_unmap(struct scatterlist *sg, void *buf, unsigned int len)
+{
+	if (!buf)
+		return;
+
+	if (sg_is_last(sg)) {
+		kunmap_atomic(buf);
+		return;
+	}
+
+	scatterwalk_map_and_copy(buf, sg, 0, len, 1);
+	kfree(buf);
+}
+
+static int scomp_acomp_comp_decomp(struct acomp_req *req, int comp_dir)
+{
+	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
+	void **tfm_ctx = acomp_tfm_ctx(tfm);
+	struct crypto_scomp *scomp = *tfm_ctx;
+	gfp_t gfp_flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+			  GFP_KERNEL : GFP_ATOMIC;
+	void **ctx = acomp_request_ctx(req);
+	unsigned int slen = req->slen;
+	unsigned int dlen = req->dlen;
+	u8 *src;
+	u8 *dst;
+	int ret;
+
+	src = scomp_map(req->src, slen, gfp_flags);
+	if (!src) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	dst = scomp_map(req->dst, dlen, gfp_flags);
+	if (!dst) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	if (comp_dir)
+		ret = crypto_scomp_compress(scomp, src, slen, dst, &dlen,
+					    *ctx);
+	else
+		ret = crypto_scomp_decompress(scomp, src, slen, dst, &dlen,
+					      *ctx);
+
+	req->dlen = dlen;
+
+out:
+	scomp_unmap(req->src, src, 0);
+	scomp_unmap(req->dst, dst, (ret < 0) ? 0 : dlen);
+
+	return ret;
+}
+
+static int scomp_acomp_compress(struct acomp_req *req)
+{
+	return scomp_acomp_comp_decomp(req, 1);
+}
+
+static int scomp_acomp_decompress(struct acomp_req *req)
+{
+	return scomp_acomp_comp_decomp(req, 0);
+}
+
+static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
+{
+	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
+
+	crypto_free_scomp(*ctx);
+}
+
+int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
+{
+	struct crypto_alg *calg = tfm->__crt_alg;
+	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
+	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
+	struct crypto_scomp *scomp;
+
+	if (!crypto_mod_get(calg))
+		return -EAGAIN;
+
+	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
+	if (IS_ERR(scomp)) {
+		crypto_mod_put(calg);
+		return PTR_ERR(scomp);
+	}
+
+	*ctx = scomp;
+	tfm->exit = crypto_exit_scomp_ops_async;
+
+	crt->compress = scomp_acomp_compress;
+	crt->decompress = scomp_acomp_decompress;
+	crt->reqsize = sizeof(void *);
+
+	return 0;
+}
+
+struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
+{
+	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
+	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
+	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
+	struct crypto_scomp *scomp = *tfm_ctx;
+	void *ctx;
+
+	ctx = crypto_scomp_alloc_ctx(scomp);
+	if (IS_ERR(ctx)) {
+		kfree(req);
+		return NULL;
+	}
+
+	*req->__ctx = ctx;
+
+	return req;
+}
+
+void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
+{
+	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
+	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
+	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
+	struct crypto_scomp *scomp = *tfm_ctx;
+	void *ctx = *req->__ctx;
+
+	if (ctx)
+		crypto_scomp_free_ctx(scomp, ctx);
+}
+
+static const struct crypto_type crypto_scomp_type = {
+	.extsize = crypto_alg_extsize,
+	.init_tfm = crypto_scomp_init_tfm,
+#ifdef CONFIG_PROC_FS
+	.show = crypto_scomp_show,
+#endif
+	.report = crypto_scomp_report,
+	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
+	.maskset = CRYPTO_ALG_TYPE_MASK,
+	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
+	.tfmsize = offsetof(struct crypto_scomp, base),
+};
+
+struct crypto_scomp *crypto_alloc_scomp(const char *alg_name, u32 type,
+					u32 mask)
+{
+	return crypto_alloc_tfm(alg_name, &crypto_scomp_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_scomp);
+
+int crypto_register_scomp(struct scomp_alg *alg)
+{
+	struct crypto_alg *base = &alg->base;
+
+	base->cra_type = &crypto_scomp_type;
+	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
+	base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
+
+	return crypto_register_alg(base);
+}
+EXPORT_SYMBOL_GPL(crypto_register_scomp);
+
+int crypto_unregister_scomp(struct scomp_alg *alg)
+{
+	return crypto_unregister_alg(&alg->base);
+}
+EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Synchronous compression type");
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index f4e2f96..93f938d 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -38,9 +38,15 @@ struct acomp_req {
  * struct crypto_acomp - user-instantiated objects which encapsulate
  * algorithms and core processing logic
  *
- * @base: Common crypto API algorithm data structure
+ * @compress:   Function performs a compress operation
+ * @decompress: Function performs a de-compress operation
+ * @reqsize:	Context size for (de)compression requests
+ * @base:	Common crypto API algorithm data structure
  */
 struct crypto_acomp {
+	int (*compress)(struct acomp_req *req);
+	int (*decompress)(struct acomp_req *req);
+	unsigned int reqsize;
 	struct crypto_tfm base;
 };
 
@@ -119,7 +125,7 @@ static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
 
 static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
 {
-	return crypto_acomp_alg(tfm)->reqsize;
+	return tfm->reqsize;
 }
 
 static inline void acomp_request_set_tfm(struct acomp_req *req,
@@ -159,26 +165,14 @@ static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask)
  *
  * Return: allocated handle in case of success or NULL in case of an error.
  */
-static inline struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm)
-{
-	struct acomp_req *req;
-
-	req = kzalloc(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
-	if (likely(req))
-		acomp_request_set_tfm(req, tfm);
-
-	return req;
-}
+struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm);
 
 /**
  * acomp_request_free() -- zeroize and free asynchronous (de)compression request
  *
  * @req: request to free
  */
-static inline void acomp_request_free(struct acomp_req *req)
-{
-	kzfree(req);
-}
+void acomp_request_free(struct acomp_req *req);
 
 /**
  * acomp_request_set_callback() -- Sets an asynchronous callback
@@ -236,9 +230,8 @@ static inline void acomp_request_set_params(struct acomp_req *req,
 static inline int crypto_acomp_compress(struct acomp_req *req)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
-	struct acomp_alg *alg = crypto_acomp_alg(tfm);
 
-	return alg->compress(req);
+	return tfm->compress(req);
 }
 
 /**
@@ -253,9 +246,8 @@ static inline int crypto_acomp_compress(struct acomp_req *req)
 static inline int crypto_acomp_decompress(struct acomp_req *req)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
-	struct acomp_alg *alg = crypto_acomp_alg(tfm);
 
-	return alg->decompress(req);
+	return tfm->decompress(req);
 }
 
 #endif
diff --git a/include/crypto/internal/acompress.h b/include/crypto/internal/acompress.h
index 294f2ee..267afdd5 100644
--- a/include/crypto/internal/acompress.h
+++ b/include/crypto/internal/acompress.h
@@ -39,6 +39,21 @@ static inline const char *acomp_alg_name(struct crypto_acomp *tfm)
 	return crypto_acomp_tfm(tfm)->__crt_alg->cra_name;
 }
 
+static inline struct acomp_req *__acomp_request_alloc(struct crypto_acomp *tfm)
+{
+	struct acomp_req *req;
+
+	req = kzalloc(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
+	if (likely(req))
+		acomp_request_set_tfm(req, tfm);
+	return req;
+}
+
+static inline void __acomp_request_free(struct acomp_req *req)
+{
+	kzfree(req);
+}
+
 /**
  * crypto_register_acomp() -- Register asynchronous compression algorithm
  *
diff --git a/include/crypto/internal/scompress.h b/include/crypto/internal/scompress.h
new file mode 100644
index 0000000..a88fc8d
--- /dev/null
+++ b/include/crypto/internal/scompress.h
@@ -0,0 +1,134 @@
+/*
+ * Synchronous Compression operations
+ *
+ * Copyright 2015 LG Electronics Inc.
+ * Copyright (c) 2016, Intel Corporation
+ * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+#ifndef _CRYPTO_SCOMP_INT_H
+#define _CRYPTO_SCOMP_INT_H
+#include <linux/crypto.h>
+
+struct crypto_scomp {
+	struct crypto_tfm base;
+};
+
+/**
+ * struct scomp_alg - synchronous compression algorithm
+ *
+ * @alloc_ctx:	Function allocates algorithm specific context
+ * @free_ctx:	Function frees context allocated with alloc_ctx
+ * @compress:	Function performs a compress operation
+ * @decompress:	Function performs a de-compress operation
+ * @init:	Initialize the cryptographic transformation object.
+ *		This function is used to initialize the cryptographic
+ *		transformation object. This function is called only once at
+ *		the instantiation time, right after the transformation context
+ *		was allocated. In case the cryptographic hardware has some
+ *		special requirements which need to be handled by software, this
+ *		function shall check for the precise requirement of the
+ *		transformation and put any software fallbacks in place.
+ * @exit:	Deinitialize the cryptographic transformation object. This is a
+ *		counterpart to @init, used to remove various changes set in
+ *		@init.
+ * @base:	Common crypto API algorithm data structure
+ */
+struct scomp_alg {
+	void *(*alloc_ctx)(struct crypto_scomp *tfm);
+	void (*free_ctx)(struct crypto_scomp *tfm, void *ctx);
+	int (*compress)(struct crypto_scomp *tfm, const u8 *src,
+			unsigned int slen, u8 *dst, unsigned int *dlen,
+			void *ctx);
+	int (*decompress)(struct crypto_scomp *tfm, const u8 *src,
+			  unsigned int slen, u8 *dst, unsigned int *dlen,
+			  void *ctx);
+	struct crypto_alg base;
+};
+
+static inline struct scomp_alg *__crypto_scomp_alg(struct crypto_alg *alg)
+{
+	return container_of(alg, struct scomp_alg, base);
+}
+
+static inline struct crypto_scomp *__crypto_scomp_tfm(struct crypto_tfm *tfm)
+{
+	return container_of(tfm, struct crypto_scomp, base);
+}
+
+static inline struct crypto_tfm *crypto_scomp_tfm(struct crypto_scomp *tfm)
+{
+	return &tfm->base;
+}
+
+static inline void crypto_free_scomp(struct crypto_scomp *tfm)
+{
+	crypto_destroy_tfm(tfm, crypto_scomp_tfm(tfm));
+}
+
+static inline struct scomp_alg *crypto_scomp_alg(struct crypto_scomp *tfm)
+{
+	return __crypto_scomp_alg(crypto_scomp_tfm(tfm)->__crt_alg);
+}
+
+static inline void *crypto_scomp_alloc_ctx(struct crypto_scomp *tfm)
+{
+	return crypto_scomp_alg(tfm)->alloc_ctx(tfm);
+}
+
+static inline void crypto_scomp_free_ctx(struct crypto_scomp *tfm,
+					 void *ctx)
+{
+	return crypto_scomp_alg(tfm)->free_ctx(tfm, ctx);
+}
+
+static inline int crypto_scomp_compress(struct crypto_scomp *tfm,
+					const u8 *src, unsigned int slen,
+					u8 *dst, unsigned int *dlen, void *ctx)
+{
+	return crypto_scomp_alg(tfm)->compress(tfm, src, slen, dst, dlen, ctx);
+}
+
+static inline int crypto_scomp_decompress(struct crypto_scomp *tfm,
+					  const u8 *src, unsigned int slen,
+					  u8 *dst, unsigned int *dlen,
+					  void *ctx)
+{
+	return crypto_scomp_alg(tfm)->decompress(tfm, src, slen, dst, dlen,
+						 ctx);
+}
+
+int crypto_init_scomp_ops_async(struct crypto_tfm *tfm);
+struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req);
+void crypto_acomp_scomp_free_ctx(struct acomp_req *req);
+
+/**
+ * crypto_register_scomp() -- Register synchronous compression algorithm
+ *
+ * Function registers an implementation of a synchronous
+ * compression algorithm
+ *
+ * @alg:	algorithm definition
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_register_scomp(struct scomp_alg *alg);
+
+/**
+ * crypto_unregister_scomp() -- Unregister synchronous compression algorithm
+ *
+ * Function unregisters an implementation of a synchronous
+ * compression algorithm
+ *
+ * @alg:	algorithm definition
+ *
+ * Return: zero on success; error code in case of error
+ */
+int crypto_unregister_scomp(struct scomp_alg *alg);
+
+#endif
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 7987323..23ceb0b 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -49,6 +49,7 @@
 #define CRYPTO_ALG_TYPE_ABLKCIPHER	0x00000005
 #define CRYPTO_ALG_TYPE_GIVCIPHER	0x00000006
 #define CRYPTO_ALG_TYPE_ACOMPRESS	0x00000008
+#define CRYPTO_ALG_TYPE_SCOMPRESS	0x0000000a
 #define CRYPTO_ALG_TYPE_RNG		0x0000000c
 #define CRYPTO_ALG_TYPE_AKCIPHER	0x0000000d
 #define CRYPTO_ALG_TYPE_DIGEST		0x0000000e
@@ -59,6 +60,7 @@
 #define CRYPTO_ALG_TYPE_HASH_MASK	0x0000000e
 #define CRYPTO_ALG_TYPE_AHASH_MASK	0x0000000e
 #define CRYPTO_ALG_TYPE_BLKCIPHER_MASK	0x0000000c
+#define CRYPTO_ALG_TYPE_ACOMPRESS_MASK	0x0000000c
 
 #define CRYPTO_ALG_LARVAL		0x00000010
 #define CRYPTO_ALG_DEAD			0x00000020
-- 
1.7.4.1

[PATCH v6 3/8] crypto: acomp - add support for lzo via scomp

[Giovanni Cabiddu]

This patch implements an scomp backend for the lzo compression algorithm.
This way, lzo is exposed through the acomp api.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/Kconfig |    1 +
 crypto/lzo.c   |   97 +++++++++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 83 insertions(+), 15 deletions(-)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 24fef55..08075c1 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1513,6 +1513,7 @@ config CRYPTO_DEFLATE
 config CRYPTO_LZO
 	tristate "LZO compression algorithm"
 	select CRYPTO_ALGAPI
+	select CRYPTO_ACOMP2
 	select LZO_COMPRESS
 	select LZO_DECOMPRESS
 	help
diff --git a/crypto/lzo.c b/crypto/lzo.c
index c3f3dd9..168df78 100644
--- a/crypto/lzo.c
+++ b/crypto/lzo.c
@@ -22,40 +22,55 @@
 #include <linux/vmalloc.h>
 #include <linux/mm.h>
 #include <linux/lzo.h>
+#include <crypto/internal/scompress.h>
 
 struct lzo_ctx {
 	void *lzo_comp_mem;
 };
 
+static void *lzo_alloc_ctx(struct crypto_scomp *tfm)
+{
+	void *ctx;
+
+	ctx = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL | __GFP_NOWARN);
+	if (!ctx)
+		ctx = vmalloc(LZO1X_MEM_COMPRESS);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	return ctx;
+}
+
 static int lzo_init(struct crypto_tfm *tfm)
 {
 	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
 
-	ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS,
-				    GFP_KERNEL | __GFP_NOWARN);
-	if (!ctx->lzo_comp_mem)
-		ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS);
-	if (!ctx->lzo_comp_mem)
+	ctx->lzo_comp_mem = lzo_alloc_ctx(NULL);
+	if (IS_ERR(ctx->lzo_comp_mem))
 		return -ENOMEM;
 
 	return 0;
 }
 
+static void lzo_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+	kvfree(ctx);
+}
+
 static void lzo_exit(struct crypto_tfm *tfm)
 {
 	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
 
-	kvfree(ctx->lzo_comp_mem);
+	lzo_free_ctx(NULL, ctx->lzo_comp_mem);
 }
 
-static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
-			    unsigned int slen, u8 *dst, unsigned int *dlen)
+static int __lzo_compress(const u8 *src, unsigned int slen,
+			  u8 *dst, unsigned int *dlen, void *ctx)
 {
-	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
 	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
 	int err;
 
-	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx->lzo_comp_mem);
+	err = lzo1x_1_compress(src, slen, dst, &tmp_len, ctx);
 
 	if (err != LZO_E_OK)
 		return -EINVAL;
@@ -64,8 +79,23 @@ static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
 	return 0;
 }
 
-static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
-			      unsigned int slen, u8 *dst, unsigned int *dlen)
+static int lzo_compress(struct crypto_tfm *tfm, const u8 *src,
+			unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	struct lzo_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	return __lzo_compress(src, slen, dst, dlen, ctx->lzo_comp_mem);
+}
+
+static int lzo_scompress(struct crypto_scomp *tfm, const u8 *src,
+			 unsigned int slen, u8 *dst, unsigned int *dlen,
+			 void *ctx)
+{
+	return __lzo_compress(src, slen, dst, dlen, ctx);
+}
+
+static int __lzo_decompress(const u8 *src, unsigned int slen,
+			    u8 *dst, unsigned int *dlen)
 {
 	int err;
 	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
@@ -77,7 +107,19 @@ static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
 
 	*dlen = tmp_len;
 	return 0;
+}
 
+static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
+			  unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	return __lzo_decompress(src, slen, dst, dlen);
+}
+
+static int lzo_sdecompress(struct crypto_scomp *tfm, const u8 *src,
+			   unsigned int slen, u8 *dst, unsigned int *dlen,
+			   void *ctx)
+{
+	return __lzo_decompress(src, slen, dst, dlen);
 }
 
 static struct crypto_alg alg = {
@@ -88,18 +130,43 @@ static struct crypto_alg alg = {
 	.cra_init		= lzo_init,
 	.cra_exit		= lzo_exit,
 	.cra_u			= { .compress = {
-	.coa_compress 		= lzo_compress,
-	.coa_decompress  	= lzo_decompress } }
+	.coa_compress		= lzo_compress,
+	.coa_decompress		= lzo_decompress } }
+};
+
+static struct scomp_alg scomp = {
+	.alloc_ctx		= lzo_alloc_ctx,
+	.free_ctx		= lzo_free_ctx,
+	.compress		= lzo_scompress,
+	.decompress		= lzo_sdecompress,
+	.base			= {
+		.cra_name	= "lzo",
+		.cra_driver_name = "lzo-scomp",
+		.cra_module	 = THIS_MODULE,
+	}
 };
 
 static int __init lzo_mod_init(void)
 {
-	return crypto_register_alg(&alg);
+	int ret;
+
+	ret = crypto_register_alg(&alg);
+	if (ret)
+		return ret;
+
+	ret = crypto_register_scomp(&scomp);
+	if (ret) {
+		crypto_unregister_alg(&alg);
+		return ret;
+	}
+
+	return ret;
 }
 
 static void __exit lzo_mod_fini(void)
 {
 	crypto_unregister_alg(&alg);
+	crypto_unregister_scomp(&scomp);
 }
 
 module_init(lzo_mod_init);
-- 
1.7.4.1

[PATCH v6 4/8] crypto: acomp - add support for lz4 via scomp

[Giovanni Cabiddu]

This patch implements an scomp backend for the lz4 compression algorithm.
This way, lz4 is exposed through the acomp api.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/Kconfig |    1 +
 crypto/lz4.c   |   91 +++++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 82 insertions(+), 10 deletions(-)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 08075c1..114d43b 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1530,6 +1530,7 @@ 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 aefbcea..99c1b2c 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);
-- 
1.7.4.1

[PATCH v6 5/8] crypto: acomp - add support for lz4hc via scomp

[Giovanni Cabiddu]

This patch implements an scomp backend for the lz4hc compression algorithm.
This way, lz4hc is exposed through the acomp api.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/Kconfig |    1 +
 crypto/lz4hc.c |   92 +++++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 83 insertions(+), 10 deletions(-)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 114d43b..59570da 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1539,6 +1539,7 @@ 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 a1d3b5b..75ffc4a 100644
--- 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);
-- 
1.7.4.1

[PATCH v6 6/8] crypto: acomp - add support for 842 via scomp

[Giovanni Cabiddu]

This patch implements an scomp backend for the 842 compression algorithm.
This way, 842 is exposed through the acomp api.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/842.c   |   82 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 crypto/Kconfig |    1 +
 2 files changed, 80 insertions(+), 3 deletions(-)

diff --git a/crypto/842.c b/crypto/842.c
index 98e387e..a954ed3 100644
--- a/crypto/842.c
+++ b/crypto/842.c
@@ -31,11 +31,46 @@
 #include <linux/module.h>
 #include <linux/crypto.h>
 #include <linux/sw842.h>
+#include <crypto/internal/scompress.h>
 
 struct crypto842_ctx {
-	char wmem[SW842_MEM_COMPRESS];	/* working memory for compress */
+	void *wmem;	/* working memory for compress */
 };
 
+static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
+{
+	void *ctx;
+
+	ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	return ctx;
+}
+
+static int crypto842_init(struct crypto_tfm *tfm)
+{
+	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	ctx->wmem = crypto842_alloc_ctx(NULL);
+	if (IS_ERR(ctx->wmem))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+	kfree(ctx);
+}
+
+static void crypto842_exit(struct crypto_tfm *tfm)
+{
+	struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	crypto842_free_ctx(NULL, ctx->wmem);
+}
+
 static int crypto842_compress(struct crypto_tfm *tfm,
 			      const u8 *src, unsigned int slen,
 			      u8 *dst, unsigned int *dlen)
@@ -45,6 +80,13 @@ static int crypto842_compress(struct crypto_tfm *tfm,
 	return sw842_compress(src, slen, dst, dlen, ctx->wmem);
 }
 
+static int crypto842_scompress(struct crypto_scomp *tfm,
+			       const u8 *src, unsigned int slen,
+			       u8 *dst, unsigned int *dlen, void *ctx)
+{
+	return sw842_compress(src, slen, dst, dlen, ctx);
+}
+
 static int crypto842_decompress(struct crypto_tfm *tfm,
 				const u8 *src, unsigned int slen,
 				u8 *dst, unsigned int *dlen)
@@ -52,27 +94,61 @@ static int crypto842_decompress(struct crypto_tfm *tfm,
 	return sw842_decompress(src, slen, dst, dlen);
 }
 
+static int crypto842_sdecompress(struct crypto_scomp *tfm,
+				 const u8 *src, unsigned int slen,
+				 u8 *dst, unsigned int *dlen, void *ctx)
+{
+	return sw842_decompress(src, slen, dst, dlen);
+}
+
 static struct crypto_alg alg = {
 	.cra_name		= "842",
 	.cra_driver_name	= "842-generic",
 	.cra_priority		= 100,
 	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-	.cra_ctxsize		= sizeof(struct crypto842_ctx),
 	.cra_module		= THIS_MODULE,
+	.cra_init		= crypto842_init,
+	.cra_exit		= crypto842_exit,
 	.cra_u			= { .compress = {
 	.coa_compress		= crypto842_compress,
 	.coa_decompress		= crypto842_decompress } }
 };
 
+static struct scomp_alg scomp = {
+	.alloc_ctx		= crypto842_alloc_ctx,
+	.free_ctx		= crypto842_free_ctx,
+	.compress		= crypto842_scompress,
+	.decompress		= crypto842_sdecompress,
+	.base			= {
+		.cra_name	= "842",
+		.cra_driver_name = "842-scomp",
+		.cra_priority	 = 100,
+		.cra_module	 = THIS_MODULE,
+	}
+};
+
 static int __init crypto842_mod_init(void)
 {
-	return crypto_register_alg(&alg);
+	int ret;
+
+	ret = crypto_register_alg(&alg);
+	if (ret)
+		return ret;
+
+	ret = crypto_register_scomp(&scomp);
+	if (ret) {
+		crypto_unregister_alg(&alg);
+		return ret;
+	}
+
+	return ret;
 }
 module_init(crypto842_mod_init);
 
 static void __exit crypto842_mod_exit(void)
 {
 	crypto_unregister_alg(&alg);
+	crypto_unregister_scomp(&scomp);
 }
 module_exit(crypto842_mod_exit);
 
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 59570da..09c88ba 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1522,6 +1522,7 @@ config CRYPTO_LZO
 config CRYPTO_842
 	tristate "842 compression algorithm"
 	select CRYPTO_ALGAPI
+	select CRYPTO_ACOMP2
 	select 842_COMPRESS
 	select 842_DECOMPRESS
 	help
-- 
1.7.4.1

[PATCH v6 7/8] crypto: acomp - add support for deflate via scomp

[Giovanni Cabiddu]

This patch implements an scomp backend for the deflate compression
algorithm. This way, deflate is exposed through the acomp api.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/Kconfig   |    1 +
 crypto/deflate.c |  111 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 102 insertions(+), 10 deletions(-)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 09c88ba..b617c5d 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1502,6 +1502,7 @@ comment "Compression"
 config CRYPTO_DEFLATE
 	tristate "Deflate compression algorithm"
 	select CRYPTO_ALGAPI
+	select CRYPTO_ACOMP2
 	select ZLIB_INFLATE
 	select ZLIB_DEFLATE
 	help
diff --git a/crypto/deflate.c b/crypto/deflate.c
index 95d8d37..f942cb3 100644
--- a/crypto/deflate.c
+++ b/crypto/deflate.c
@@ -32,6 +32,7 @@
 #include <linux/interrupt.h>
 #include <linux/mm.h>
 #include <linux/net.h>
+#include <crypto/internal/scompress.h>
 
 #define DEFLATE_DEF_LEVEL		Z_DEFAULT_COMPRESSION
 #define DEFLATE_DEF_WINBITS		11
@@ -101,9 +102,8 @@ static void deflate_decomp_exit(struct deflate_ctx *ctx)
 	vfree(ctx->decomp_stream.workspace);
 }
 
-static int deflate_init(struct crypto_tfm *tfm)
+static int __deflate_init(void *ctx)
 {
-	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
 	int ret;
 
 	ret = deflate_comp_init(ctx);
@@ -116,19 +116,55 @@ out:
 	return ret;
 }
 
-static void deflate_exit(struct crypto_tfm *tfm)
+static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
+{
+	struct deflate_ctx *ctx;
+	int ret;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	ret = __deflate_init(ctx);
+	if (ret) {
+		kfree(ctx);
+		return ERR_PTR(ret);
+	}
+
+	return ctx;
+}
+
+static int deflate_init(struct crypto_tfm *tfm)
 {
 	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
 
+	return __deflate_init(ctx);
+}
+
+static void __deflate_exit(void *ctx)
+{
 	deflate_comp_exit(ctx);
 	deflate_decomp_exit(ctx);
 }
 
-static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
-			    unsigned int slen, u8 *dst, unsigned int *dlen)
+static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+	__deflate_exit(ctx);
+	kzfree(ctx);
+}
+
+static void deflate_exit(struct crypto_tfm *tfm)
+{
+	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
+
+	__deflate_exit(ctx);
+}
+
+static int __deflate_compress(const u8 *src, unsigned int slen,
+			      u8 *dst, unsigned int *dlen, void *ctx)
 {
 	int ret = 0;
-	struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+	struct deflate_ctx *dctx = ctx;
 	struct z_stream_s *stream = &dctx->comp_stream;
 
 	ret = zlib_deflateReset(stream);
@@ -153,12 +189,27 @@ out:
 	return ret;
 }
 
-static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
-			      unsigned int slen, u8 *dst, unsigned int *dlen)
+static int deflate_compress(struct crypto_tfm *tfm, const u8 *src,
+			    unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+
+	return __deflate_compress(src, slen, dst, dlen, dctx);
+}
+
+static int deflate_scompress(struct crypto_scomp *tfm, const u8 *src,
+			     unsigned int slen, u8 *dst, unsigned int *dlen,
+			     void *ctx)
+{
+	return __deflate_compress(src, slen, dst, dlen, ctx);
+}
+
+static int __deflate_decompress(const u8 *src, unsigned int slen,
+				u8 *dst, unsigned int *dlen, void *ctx)
 {
 
 	int ret = 0;
-	struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+	struct deflate_ctx *dctx = ctx;
 	struct z_stream_s *stream = &dctx->decomp_stream;
 
 	ret = zlib_inflateReset(stream);
@@ -194,6 +245,21 @@ out:
 	return ret;
 }
 
+static int deflate_decompress(struct crypto_tfm *tfm, const u8 *src,
+			      unsigned int slen, u8 *dst, unsigned int *dlen)
+{
+	struct deflate_ctx *dctx = crypto_tfm_ctx(tfm);
+
+	return __deflate_decompress(src, slen, dst, dlen, dctx);
+}
+
+static int deflate_sdecompress(struct crypto_scomp *tfm, const u8 *src,
+			       unsigned int slen, u8 *dst, unsigned int *dlen,
+			       void *ctx)
+{
+	return __deflate_decompress(src, slen, dst, dlen, ctx);
+}
+
 static struct crypto_alg alg = {
 	.cra_name		= "deflate",
 	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
@@ -206,14 +272,39 @@ static struct crypto_alg alg = {
 	.coa_decompress  	= deflate_decompress } }
 };
 
+static struct scomp_alg scomp = {
+	.alloc_ctx		= deflate_alloc_ctx,
+	.free_ctx		= deflate_free_ctx,
+	.compress		= deflate_scompress,
+	.decompress		= deflate_sdecompress,
+	.base			= {
+		.cra_name	= "deflate",
+		.cra_driver_name = "deflate-scomp",
+		.cra_module	 = THIS_MODULE,
+	}
+};
+
 static int __init deflate_mod_init(void)
 {
-	return crypto_register_alg(&alg);
+	int ret;
+
+	ret = crypto_register_alg(&alg);
+	if (ret)
+		return ret;
+
+	ret = crypto_register_scomp(&scomp);
+	if (ret) {
+		crypto_unregister_alg(&alg);
+		return ret;
+	}
+
+	return ret;
 }
 
 static void __exit deflate_mod_fini(void)
 {
 	crypto_unregister_alg(&alg);
+	crypto_unregister_scomp(&scomp);
 }
 
 module_init(deflate_mod_init);
-- 
1.7.4.1

[PATCH v6 8/8] crypto: acomp - update testmgr with support for acomp

[Giovanni Cabiddu]

This patch adds tests to the test manager for algorithms exposed through
the acomp api

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 crypto/testmgr.c |  158 +++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 145 insertions(+), 13 deletions(-)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index c727fb0..fc47716 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -32,6 +32,7 @@
 #include <crypto/rng.h>
 #include <crypto/drbg.h>
 #include <crypto/akcipher.h>
+#include <crypto/acompress.h>
 
 #include "internal.h"
 
@@ -1423,6 +1424,121 @@ out:
 	return ret;
 }
 
+static int test_acomp(struct crypto_acomp *tfm, struct comp_testvec *ctemplate,
+		      struct comp_testvec *dtemplate, int ctcount, int dtcount)
+{
+	const char *algo = crypto_tfm_alg_driver_name(crypto_acomp_tfm(tfm));
+	unsigned int i;
+	char output[COMP_BUF_SIZE];
+	int ret;
+	struct scatterlist src, dst;
+	struct acomp_req *req;
+	struct tcrypt_result result;
+
+	for (i = 0; i < ctcount; i++) {
+		unsigned int dlen = COMP_BUF_SIZE;
+		int ilen = ctemplate[i].inlen;
+
+		memset(output, 0, sizeof(output));
+		init_completion(&result.completion);
+		sg_init_one(&src, ctemplate[i].input, ilen);
+		sg_init_one(&dst, output, dlen);
+
+		req = acomp_request_alloc(tfm);
+		if (!req) {
+			pr_err("alg: acomp: request alloc failed for %s\n",
+			       algo);
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		acomp_request_set_params(req, &src, &dst, ilen, dlen);
+		acomp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+					   tcrypt_complete, &result);
+
+		ret = wait_async_op(&result, crypto_acomp_compress(req));
+		if (ret) {
+			pr_err("alg: acomp: compression failed on test %d for %s: ret=%d\n",
+			       i + 1, algo, -ret);
+			acomp_request_free(req);
+			goto out;
+		}
+
+		if (req->dlen != ctemplate[i].outlen) {
+			pr_err("alg: acomp: Compression test %d failed for %s: output len = %d\n",
+			       i + 1, algo, req->dlen);
+			ret = -EINVAL;
+			acomp_request_free(req);
+			goto out;
+		}
+
+		if (memcmp(output, ctemplate[i].output, req->dlen)) {
+			pr_err("alg: acomp: Compression test %d failed for %s\n",
+			       i + 1, algo);
+			hexdump(output, req->dlen);
+			ret = -EINVAL;
+			acomp_request_free(req);
+			goto out;
+		}
+
+		acomp_request_free(req);
+	}
+
+	for (i = 0; i < dtcount; i++) {
+		unsigned int dlen = COMP_BUF_SIZE;
+		int ilen = dtemplate[i].inlen;
+
+		memset(output, 0, sizeof(output));
+		init_completion(&result.completion);
+		sg_init_one(&src, dtemplate[i].input, ilen);
+		sg_init_one(&dst, output, dlen);
+
+		req = acomp_request_alloc(tfm);
+		if (!req) {
+			pr_err("alg: acomp: request alloc failed for %s\n",
+			       algo);
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		acomp_request_set_params(req, &src, &dst, ilen, dlen);
+		acomp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+					   tcrypt_complete, &result);
+
+		ret = wait_async_op(&result, crypto_acomp_decompress(req));
+		if (ret) {
+			pr_err("alg: acomp: decompression failed on test %d for %s: ret=%d\n",
+			       i + 1, algo, -ret);
+			acomp_request_free(req);
+			goto out;
+		}
+
+		if (req->dlen != dtemplate[i].outlen) {
+			pr_err("alg: acomp: Decompression test %d failed for %s: output len = %d\n",
+			       i + 1, algo, req->dlen);
+			ret = -EINVAL;
+			acomp_request_free(req);
+			goto out;
+		}
+
+		if (memcmp(output, dtemplate[i].output, req->dlen)) {
+			pr_err("alg: acomp: Decompression test %d failed for %s\n",
+			       i + 1, algo);
+			hexdump(output, req->dlen);
+			ret = -EINVAL;
+			acomp_request_free(req);
+			goto out;
+		}
+
+		acomp_request_free(req);
+	}
+
+	ret = 0;
+
+out:
+	return ret;
+}
+
 static int test_cprng(struct crypto_rng *tfm, struct cprng_testvec *template,
 		      unsigned int tcount)
 {
@@ -1574,22 +1690,38 @@ out:
 static int alg_test_comp(const struct alg_test_desc *desc, const char *driver,
 			 u32 type, u32 mask)
 {
-	struct crypto_comp *tfm;
+	struct crypto_comp *comp;
+	struct crypto_acomp *acomp;
 	int err;
+	u32 algo_type = type & CRYPTO_ALG_TYPE_ACOMPRESS_MASK;
+
+	if (algo_type == CRYPTO_ALG_TYPE_ACOMPRESS) {
+		acomp = crypto_alloc_acomp(driver, type, mask);
+		if (IS_ERR(acomp)) {
+			pr_err("alg: acomp: Failed to load transform for %s: %ld\n",
+			       driver, PTR_ERR(acomp));
+			return PTR_ERR(acomp);
+		}
+		err = test_acomp(acomp, desc->suite.comp.comp.vecs,
+				 desc->suite.comp.decomp.vecs,
+				 desc->suite.comp.comp.count,
+				 desc->suite.comp.decomp.count);
+		crypto_free_acomp(acomp);
+	} else {
+		comp = crypto_alloc_comp(driver, type, mask);
+		if (IS_ERR(comp)) {
+			pr_err("alg: comp: Failed to load transform for %s: %ld\n",
+			       driver, PTR_ERR(comp));
+			return PTR_ERR(comp);
+		}
 
-	tfm = crypto_alloc_comp(driver, type, mask);
-	if (IS_ERR(tfm)) {
-		printk(KERN_ERR "alg: comp: Failed to load transform for %s: "
-		       "%ld\n", driver, PTR_ERR(tfm));
-		return PTR_ERR(tfm);
-	}
-
-	err = test_comp(tfm, desc->suite.comp.comp.vecs,
-			desc->suite.comp.decomp.vecs,
-			desc->suite.comp.comp.count,
-			desc->suite.comp.decomp.count);
+		err = test_comp(comp, desc->suite.comp.comp.vecs,
+				desc->suite.comp.decomp.vecs,
+				desc->suite.comp.comp.count,
+				desc->suite.comp.decomp.count);
 
-	crypto_free_comp(tfm);
+		crypto_free_comp(comp);
+	}
 	return err;
 }
 
-- 
1.7.4.1

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Herbert Xu]

On Wed, Jun 08, 2016 at 09:16:52AM +0100, Giovanni Cabiddu wrote:
>
> +static void *scomp_map(struct scatterlist *sg, unsigned int len,
> +		       gfp_t gfp_flags)
> +{
> +	void *buf;
> +
> +	if (sg_is_last(sg))
> +		return kmap_atomic(sg_page(sg)) + sg->offset;

This doesn't work, because kmap_atomic maps a single page only
bug an SG entry can be a super-page, e.g., a set of contiguous
pages.

> +	buf = kmalloc(len, gfp_flags);

The backup path is also very unlikely to work because we'll be
hitting this with 64K sizes and this just won't work with a 4K
page size.

So up until now we've getting around this 64K issue with vmalloc,
and then we try to conserve the precious vmalloc resource by using
per-cpu allocation.

This totally breaks down once you go to DMA, where an SG list is
required.  Unfortunately, this means that there is no easy way
to linearise the data for our software implementations.

There is no easy way out I'm afraid.  I think we'll have to bite
the bullet and refit our software algos so that they handle SG
lists.

Not only will this solve the problem at hand, it'll also mean that
acomp users will never have to do vmalloc so it's a win-win.  It
also means that we won't need the scomp interface at all.

This does bring up another question of who should be allocating the
output memory.  Up until now it has been up to the user to do so.
However, if our algos can actually handle SG lists then I think it
should be fairly easy to make them do the allocation instead.  What
do you think?

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Giovanni Cabiddu]

On Mon, Jun 13, 2016 at 04:56:12PM +0800, Herbert Xu wrote:
> The backup path is also very unlikely to work because we'll be
> hitting this with 64K sizes and this just won't work with a 4K
> page size.
Is scatterwalk_map_and_copy broken?

> So up until now we've getting around this 64K issue with vmalloc,
> and then we try to conserve the precious vmalloc resource by using
> per-cpu allocation.
I don't clearly understand what is the issue.
Can you please give me more details?

> This totally breaks down once you go to DMA, where an SG list is
> required. 
scomp backends should be used only for software implementations. 
A driver backend which needs DMA should plug into acomp.

> Unfortunately, this means that there is no easy way
> to linearise the data for our software implementations.
> 
> There is no easy way out I'm afraid.  I think we'll have to bite
> the bullet and refit our software algos so that they handle SG
> lists.
Although feasible, I think it wouldn't be an easy job.

> Not only will this solve the problem at hand, it'll also mean that
> acomp users will never have to do vmalloc so it's a win-win.  It
> also means that we won't need the scomp interface at all.
> 
> This does bring up another question of who should be allocating the
> output memory.  Up until now it has been up to the user to do so.
> However, if our algos can actually handle SG lists then I think it
> should be fairly easy to make them do the allocation instead.  What
> do you think?
I would prefer the user of the api to allocate and manage the output
memory.

Thanks,

-- 
Giovanni

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Herbert Xu]

On Wed, Jun 22, 2016 at 04:53:50PM +0100, Giovanni Cabiddu wrote:
> On Mon, Jun 13, 2016 at 04:56:12PM +0800, Herbert Xu wrote:
> > The backup path is also very unlikely to work because we'll be
> > hitting this with 64K sizes and this just won't work with a 4K
> > page size.
> Is scatterwalk_map_and_copy broken?

No that's not the problem.  The problem is that you can't kmalloc
64K of memory.  kmalloc requires physically contiguous memory and
you cannot rely on having 64K of contiguous memory.

> > This totally breaks down once you go to DMA, where an SG list is
> > required. 
> scomp backends should be used only for software implementations. 
> A driver backend which needs DMA should plug into acomp.

What I'm saying is that the current strategy of using vmalloc
memory as input/output buffers cannot possibly work with acomp
since you cannot do DMA over vmalloc memory.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Giovanni Cabiddu]

On Thu, Jun 23, 2016 at 06:50:34PM +0800, Herbert Xu wrote:
> No that's not the problem.  The problem is that you can't kmalloc
> 64K of memory.  kmalloc requires physically contiguous memory and
> you cannot rely on having 64K of contiguous memory.
It is clear now. Thanks.

> > > This totally breaks down once you go to DMA, where an SG list is
> > > required. 
> > scomp backends should be used only for software implementations. 
> > A driver backend which needs DMA should plug into acomp.
> 
> What I'm saying is that the current strategy of using vmalloc
> memory as input/output buffers cannot possibly work with acomp
> since you cannot do DMA over vmalloc memory.
I'll remove scomp and refit the software algos to plug into acomp
directly.
Would it be admissible if software algos implementations will vmalloc
the source and the destination buffers for linearizing the scatter gather
lists and will operate on those?

Thanks,

-- 
Giovanni

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Herbert Xu]

On Fri, Jun 24, 2016 at 09:37:28AM +0100, Giovanni Cabiddu wrote:
>
> I'll remove scomp and refit the software algos to plug into acomp
> directly.
> Would it be admissible if software algos implementations will vmalloc
> the source and the destination buffers for linearizing the scatter gather
> lists and will operate on those?

Hmm, I guess we can still keep scomp and use vmalloc until someone
spends the effort and optimises each algorithm to make them use acomp
directly.

So I'd still like to move the allocation down into the algorithm.
That way IPsec no longer needs to keep around a 64K buffer when
the average packet size is less than a page.

What we can do for legacy scomp algorithms is to keep a per-cpu
cache of 64K scratch buffers allocated using vmalloc.  Obviously
this means that if the output size exceeds 64K then we will fail
the operation.  But I don't really see an option besides optimising
the algorithm to use acomp.

IOW let's move the memory allocation logic of IPComp into the scomp
layer.  Before we do that we should also make sure that no other
users of crypto compress needs output sizes in excess of 64K.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Giovanni Cabiddu]

On Fri, Jun 24, 2016 at 05:26:43PM +0800, Herbert Xu wrote:
> Hmm, I guess we can still keep scomp and use vmalloc until someone
> spends the effort and optimises each algorithm to make them use acomp
> directly.
Ok.

> So I'd still like to move the allocation down into the algorithm.
> That way IPsec no longer needs to keep around a 64K buffer when
> the average packet size is less than a page.
> 
> What we can do for legacy scomp algorithms is to keep a per-cpu
> cache of 64K scratch buffers allocated using vmalloc.  Obviously
> this means that if the output size exceeds 64K then we will fail
> the operation.  But I don't really see an option besides optimising
> the algorithm to use acomp.
Are you suggesting a different cache of scratch buffers for every
algorithm implementation or a shared cache shared across all legacy
scomp algorithms?

> IOW let's move the memory allocation logic of IPComp into the scomp
> layer.  Before we do that we should also make sure that no other
> users of crypto compress needs output sizes in excess of 64K.
Would it be ok 128K instead?
We are proposing to use the acomp API from BTRFS. Limiting the size
of the source and destination buffers to 64K would not work since
BTRFS usually compresses 128KB. 
Here is the RFC sent by Weigang to the BTFS list:
http://www.spinics.net/lists/linux-btrfs/msg56648.html

Regards,

-- 
Giovanni

Re: [PATCH v6 2/8] crypto: add driver-side scomp interface

[Herbert Xu]

On Tue, Jun 28, 2016 at 08:41:42AM +0100, Giovanni Cabiddu wrote:
>
> Are you suggesting a different cache of scratch buffers for every
> algorithm implementation or a shared cache shared across all legacy
> scomp algorithms?

One that's shared for every scomp algorithm.

> Would it be ok 128K instead?
> We are proposing to use the acomp API from BTRFS. Limiting the size
> of the source and destination buffers to 64K would not work since
> BTRFS usually compresses 128KB. 
> Here is the RFC sent by Weigang to the BTFS list:
> http://www.spinics.net/lists/linux-btrfs/msg56648.html

While I don't see any big differences between 64K and 128K, I have
noticed that btrfs is already doing partial decompression on a
page-by-page basis, which is the most optimal setup.

So whatever we do for this conversion we should make sure that
btrfs does not regress into using vmalloc.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt