[PATCH] crypto: qat - disable registration of algorithms

[PATCH] crypto: qat - disable registration of algorithms

[Giovanni Cabiddu]

The implementations of aead and skcipher in the QAT driver do not
support properly requests with the CRYPTO_TFM_REQ_MAY_BACKLOG flag set.
If the HW queue is full, the driver returns -EBUSY but does not enqueue
the request.
This can result in applications like dm-crypt waiting indefinitely for a
completion of a request that was never submitted to the hardware.

To avoid this problem, disable the registration of all crypto algorithms
in the QAT driver by setting the number of crypto instances to 0 at
configuration time.

Cc: stable@vger.kernel.org
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 drivers/crypto/qat/qat_4xxx/adf_drv.c      | 7 +++++++
 drivers/crypto/qat/qat_common/qat_crypto.c | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/crypto/qat/qat_4xxx/adf_drv.c b/drivers/crypto/qat/qat_4xxx/adf_drv.c
index a6c78b9c730b..fa4c350c1bf9 100644
--- a/drivers/crypto/qat/qat_4xxx/adf_drv.c
+++ b/drivers/crypto/qat/qat_4xxx/adf_drv.c
@@ -75,6 +75,13 @@ static int adf_crypto_dev_config(struct adf_accel_dev *accel_dev)
 	if (ret)
 		goto err;
 
+	/* Temporarily set the number of crypto instances to zero to avoid
+	 * registering the crypto algorithms.
+	 * This will be removed when the algorithms will support the
+	 * CRYPTO_TFM_REQ_MAY_BACKLOG flag
+	 */
+	instances = 0;
+
 	for (i = 0; i < instances; i++) {
 		val = i;
 		bank = i * 2;
diff --git a/drivers/crypto/qat/qat_common/qat_crypto.c b/drivers/crypto/qat/qat_common/qat_crypto.c
index 7234c4940fae..67c9588e89df 100644
--- a/drivers/crypto/qat/qat_common/qat_crypto.c
+++ b/drivers/crypto/qat/qat_common/qat_crypto.c
@@ -161,6 +161,13 @@ int qat_crypto_dev_config(struct adf_accel_dev *accel_dev)
 	if (ret)
 		goto err;
 
+	/* Temporarily set the number of crypto instances to zero to avoid
+	 * registering the crypto algorithms.
+	 * This will be removed when the algorithms will support the
+	 * CRYPTO_TFM_REQ_MAY_BACKLOG flag
+	 */
+	instances = 0;
+
 	for (i = 0; i < instances; i++) {
 		val = i;
 		snprintf(key, sizeof(key), ADF_CY "%d" ADF_RING_ASYM_BANK_NUM, i);
-- 
2.35.1

Re: [PATCH] crypto: qat - disable registration of algorithms

[Herbert Xu]

On Fri, Mar 04, 2022 at 05:54:47PM +0000, Giovanni Cabiddu wrote:
> The implementations of aead and skcipher in the QAT driver do not
> support properly requests with the CRYPTO_TFM_REQ_MAY_BACKLOG flag set.
> If the HW queue is full, the driver returns -EBUSY but does not enqueue
> the request.
> This can result in applications like dm-crypt waiting indefinitely for a
> completion of a request that was never submitted to the hardware.
> 
> To avoid this problem, disable the registration of all crypto algorithms
> in the QAT driver by setting the number of crypto instances to 0 at
> configuration time.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
> ---
>  drivers/crypto/qat/qat_4xxx/adf_drv.c      | 7 +++++++
>  drivers/crypto/qat/qat_common/qat_crypto.c | 7 +++++++
>  2 files changed, 14 insertions(+)

Patch applied.  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