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Message-Id: <20260125033537.334628-23-kanchana.p.sridhar@intel.com>
Date: Sat, 24 Jan 2026 19:35:33 -0800
From: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
To: linux-kernel@...r.kernel.org,
linux-mm@...ck.org,
hannes@...xchg.org,
yosry.ahmed@...ux.dev,
nphamcs@...il.com,
chengming.zhou@...ux.dev,
usamaarif642@...il.com,
ryan.roberts@....com,
21cnbao@...il.com,
ying.huang@...ux.alibaba.com,
akpm@...ux-foundation.org,
senozhatsky@...omium.org,
sj@...nel.org,
kasong@...cent.com,
linux-crypto@...r.kernel.org,
herbert@...dor.apana.org.au,
davem@...emloft.net,
clabbe@...libre.com,
ardb@...nel.org,
ebiggers@...gle.com,
surenb@...gle.com,
kristen.c.accardi@...el.com,
vinicius.gomes@...el.com,
giovanni.cabiddu@...el.com
Cc: wajdi.k.feghali@...el.com,
kanchana.p.sridhar@...el.com
Subject: [PATCH v14 22/26] crypto: acomp - Add crypto_acomp_batch_size() to get an algorithm's batch-size.
This commit adds a @batch_size data member to struct acomp_alg.
An acomp_alg compression algorithm that supports batching of
compressions and decompressions must provide a @batch_size greater than
one, representing the maximum batch-size that the compressor supports,
so that kernel users of crypto_acomp, such as zswap, can allocate
resources for submitting multiple compress/decompress jobs that can be
batched, and invoke batching of [de]compressions.
The new crypto_acomp_batch_size() API queries the crypto_acomp's
acomp_alg for the batch-size. If the acomp_alg has registered a
@batch_size greater than 1, this is returned. If not, a default of "1"
is returned.
zswap can invoke crypto_acomp_batch_size() to query the maximum number
of requests that can be batch [de]compressed. Based on this, zswap
can use the minimum of any zswap-specific upper limits for batch-size
and the compressor's max @batch_size, to allocate batching resources.
The IAA acomp_algs Fixed ("deflate-iaa") and Dynamic
("deflate-iaa-dynamic") register @batch_size as
IAA_CRYPTO_MAX_BATCH_SIZE.
This enables zswap to compress/decompress pages in parallel in the IAA
hardware accelerator to improve swapout/swapin performance and memory
savings.
Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
---
crypto/acompress.c | 14 ++++++++++++++
drivers/crypto/intel/iaa/iaa_crypto_main.c | 2 ++
include/crypto/acompress.h | 12 ++++++++++++
include/crypto/internal/acompress.h | 3 +++
4 files changed, 31 insertions(+)
diff --git a/crypto/acompress.c b/crypto/acompress.c
index c48a1a20e21f..02c25c79c0d4 100644
--- a/crypto/acompress.c
+++ b/crypto/acompress.c
@@ -387,6 +387,20 @@ int crypto_acomp_decompress(struct acomp_req *req)
}
EXPORT_SYMBOL_GPL(crypto_acomp_decompress);
+unsigned int crypto_acomp_batch_size(struct crypto_acomp *tfm)
+{
+ if (acomp_is_async(tfm) &&
+ (crypto_comp_alg_common(tfm)->base.cra_flags & CRYPTO_ALG_TYPE_ACOMPRESS)) {
+ struct acomp_alg *alg = crypto_acomp_alg(tfm);
+
+ if (alg && alg->batch_size > 1)
+ return alg->batch_size;
+ }
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(crypto_acomp_batch_size);
+
void comp_prepare_alg(struct comp_alg_common *alg)
{
struct crypto_alg *base = &alg->base;
diff --git a/drivers/crypto/intel/iaa/iaa_crypto_main.c b/drivers/crypto/intel/iaa/iaa_crypto_main.c
index fe9f59ede577..e735aa01dce8 100644
--- a/drivers/crypto/intel/iaa/iaa_crypto_main.c
+++ b/drivers/crypto/intel/iaa/iaa_crypto_main.c
@@ -2729,6 +2729,7 @@ static struct acomp_alg iaa_acomp_fixed_deflate = {
.compress = iaa_crypto_acomp_acompress_main,
.decompress = iaa_crypto_acomp_adecompress_main,
.batch_completed = iaa_crypto_acomp_batch_completed,
+ .batch_size = IAA_CRYPTO_MAX_BATCH_SIZE,
.base = {
.cra_name = "deflate",
.cra_driver_name = "deflate-iaa",
@@ -2755,6 +2756,7 @@ static struct acomp_alg iaa_acomp_dynamic_deflate = {
.compress = iaa_crypto_acomp_acompress_main,
.decompress = iaa_crypto_acomp_adecompress_main,
.batch_completed = iaa_crypto_acomp_batch_completed,
+ .batch_size = IAA_CRYPTO_MAX_BATCH_SIZE,
.base = {
.cra_name = "deflate",
.cra_driver_name = "deflate-iaa-dynamic",
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index 752110a7719c..1448b20de492 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -598,6 +598,18 @@ int crypto_acomp_compress(struct acomp_req *req);
*/
int crypto_acomp_decompress(struct acomp_req *req);
+/**
+ * crypto_acomp_batch_size() -- Get the algorithm's batch size
+ *
+ * Function returns the algorithm's batch size for batching operations
+ *
+ * @tfm: ACOMPRESS tfm handle allocated with crypto_alloc_acomp()
+ *
+ * Return: @tfm's acomp_alg's @batch_size, if it has defined a
+ * @batch_size greater than 1; else return 1.
+ */
+unsigned int crypto_acomp_batch_size(struct crypto_acomp *tfm);
+
static inline struct acomp_req *acomp_request_on_stack_init(
char *buf, struct crypto_acomp *tfm)
{
diff --git a/include/crypto/internal/acompress.h b/include/crypto/internal/acompress.h
index 7c4e14491d59..dc126a8cfea2 100644
--- a/include/crypto/internal/acompress.h
+++ b/include/crypto/internal/acompress.h
@@ -34,6 +34,8 @@
* of all batch sub-requests having completed.
* Returns an error code in @req->slen if any
* of the sub-requests completed with an error.
+ * @batch_size: Maximum batch-size for batching compress/decompress
+ * operations.
* @init: Initialize the cryptographic transformation object.
* This function is used to initialize the cryptographic
* transformation object. This function is called only once at
@@ -53,6 +55,7 @@ struct acomp_alg {
int (*compress)(struct acomp_req *req);
int (*decompress)(struct acomp_req *req);
bool (*batch_completed)(struct acomp_req *req, bool comp);
+ unsigned int batch_size;
int (*init)(struct crypto_acomp *tfm);
void (*exit)(struct crypto_acomp *tfm);
--
2.27.0
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