[PATCH v4 1/3] crypto: introduce crypto_acomp_get_alg_flags to expose algorithm flags

[Barry Song <21cnbao@gmail.com>]

From: Barry Song <v-songbaohua@oppo.com>

acomp's users might want to know algorithm flags to optimize
themselves. One typical user which can benefit from exposed
alg flags is zswap.

In zswap, zsmalloc is the most commonly used allocator for
(and perhaps the only one). For zsmalloc, we cannot sleep
while we map the compressed memory, so we copy it to a
temporary buffer. By knowing the alg won't sleep can help
zswap to avoid the need for a buffer. This shows noticeable
improvement in load/store latency of zswap.

This patch also fixes the missing ASYNC cra_flags in Intel
iaa and Hisilicon zip drivers.

Cc: Yang Shen <shenyang39@huawei.com>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
---
 drivers/crypto/hisilicon/zip/zip_crypto.c  | 1 +
 drivers/crypto/intel/iaa/iaa_crypto_main.c | 1 +
 include/crypto/acompress.h                 | 5 +++++
 include/linux/crypto.h                     | 5 +++++
 4 files changed, 12 insertions(+)

diff --git a/drivers/crypto/hisilicon/zip/zip_crypto.c b/drivers/crypto/hisilicon/zip/zip_crypto.c
index c650c741a18d..94e2d66b04b6 100644
--- a/drivers/crypto/hisilicon/zip/zip_crypto.c
+++ b/drivers/crypto/hisilicon/zip/zip_crypto.c
@@ -591,6 +591,7 @@ static struct acomp_alg hisi_zip_acomp_deflate = {
 	.base			= {
 		.cra_name		= "deflate",
 		.cra_driver_name	= "hisi-deflate-acomp",
+		.cra_flags		= CRYPTO_ALG_ASYNC,
 		.cra_module		= THIS_MODULE,
 		.cra_priority		= HZIP_ALG_PRIORITY,
 		.cra_ctxsize		= sizeof(struct hisi_zip_ctx),
diff --git a/drivers/crypto/intel/iaa/iaa_crypto_main.c b/drivers/crypto/intel/iaa/iaa_crypto_main.c
index dfd3baf0a8d8..91adf9d76a2e 100644
--- a/drivers/crypto/intel/iaa/iaa_crypto_main.c
+++ b/drivers/crypto/intel/iaa/iaa_crypto_main.c
@@ -1916,6 +1916,7 @@ static struct acomp_alg iaa_acomp_fixed_deflate = {
 	.base			= {
 		.cra_name		= "deflate",
 		.cra_driver_name	= "deflate-iaa",
+		.cra_flags		= CRYPTO_ALG_ASYNC,
 		.cra_ctxsize		= sizeof(struct iaa_compression_ctx),
 		.cra_module		= THIS_MODULE,
 		.cra_priority		= IAA_ALG_PRIORITY,
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index 574cffc90730..07bd8f6bc79a 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -160,6 +160,11 @@ static inline void acomp_request_set_tfm(struct acomp_req *req,
 	req->base.tfm = crypto_acomp_tfm(tfm);
 }
 
+static inline u32 crypto_acomp_get_alg_flags(struct crypto_acomp *tfm)
+{
+	return crypto_tfm_alg_flags(crypto_acomp_tfm(tfm));
+}
+
 static inline struct crypto_acomp *crypto_acomp_reqtfm(struct acomp_req *req)
 {
 	return __crypto_acomp_tfm(req->base.tfm);
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index b164da5e129e..811bfaf8b6f8 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -467,6 +467,11 @@ static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
 	return tfm->__crt_alg->cra_blocksize;
 }
 
+static inline unsigned int crypto_tfm_alg_flags(struct crypto_tfm *tfm)
+{
+	return tfm->__crt_alg->cra_flags;
+}
+
 static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
 {
 	return tfm->__crt_alg->cra_alignmask;
-- 
2.34.1