crypto: acomp - add driver-side scomp interface

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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Makefile

@@ -51,6 +51,7 @@ rsa_generic-y += rsa-pkcs1pad.o
 obj-$(CONFIG_CRYPTO_RSA) += rsa_generic.o
 
 obj-$(CONFIG_CRYPTO_ACOMP2) += acompress.o
+obj-$(CONFIG_CRYPTO_ACOMP2) += scompress.o
 
 cryptomgr-y := algboss.o testmgr.o
 

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 +70,14 @@ 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->dst_free = alg->dst_free;
+	acomp->reqsize = alg->reqsize;
+
 	if (alg->exit)
 		acomp->base.exit = crypto_acomp_exit_tfm;
 
@@ -76,15 +87,25 @@ static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
 	return 0;
 }
 
+static 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 +117,36 @@ 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);
+
+	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
+		acomp->dst_free(req->dst);
+		req->dst = NULL;
+	}
+
+	__acomp_request_free(req);
+}
+EXPORT_SYMBOL_GPL(acomp_request_free);
+
 int crypto_register_acomp(struct acomp_alg *alg)
 {
 	struct crypto_alg *base = &alg->base;