Hi, Giovanni, all,
On Wed, Feb 1, 2023 at 6:05 PM Giovanni Cabiddu
<giovanni.cabiddu@xxxxxxxxx> wrote:
>
> The functions qat_crypto_get_instance_node() and
> qat_compression_get_instance_node() allow to get a QAT instance (ring
> pair) on a device close to the node specified as input parameter.
> When this is not possible, and a QAT device is available in the system,
> these function return an instance on a remote node and they print a
> message reporting that it is not possible to find a device on the specified
> node. This is interpreted by people as an error rather than an info.
>
> The print "Could not find a device on node" indicates that a kernel
> application is running on a core in a socket that does not have a QAT
> device directly attached to it and performance might suffer.
>
> Due to the nature of the message, this can be considered as a debug
> message, therefore drop the severity to debug and report it only once
> to avoid flooding.
>
> Suggested-by: Vladis Dronov <vdronov@xxxxxxxxxx>
> Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>
> Reviewed-by: Fiona Trahe <fiona.trahe@xxxxxxxxx>
> ---
> drivers/crypto/qat/qat_common/qat_compression.c | 2 +-
> drivers/crypto/qat/qat_common/qat_crypto.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/crypto/qat/qat_common/qat_compression.c b/drivers/crypto/qat/qat_common/qat_compression.c
> index 9fd10f4242f8..3f1f35283266 100644
> --- a/drivers/crypto/qat/qat_common/qat_compression.c
> +++ b/drivers/crypto/qat/qat_common/qat_compression.c
> @@ -72,7 +72,7 @@ struct qat_compression_instance *qat_compression_get_instance_node(int node)
> }
>
> if (!accel_dev) {
> - pr_info("QAT: Could not find a device on node %d\n", node);
> + pr_debug_ratelimited("QAT: Could not find a device on node %d\n", node);
> /* Get any started device */
> list_for_each(itr, adf_devmgr_get_head()) {
> struct adf_accel_dev *tmp_dev;
> diff --git a/drivers/crypto/qat/qat_common/qat_crypto.c b/drivers/crypto/qat/qat_common/qat_crypto.c
> index e31199eade5b..40c8e74d1cf9 100644
> --- a/drivers/crypto/qat/qat_common/qat_crypto.c
> +++ b/drivers/crypto/qat/qat_common/qat_crypto.c
> @@ -70,7 +70,7 @@ struct qat_crypto_instance *qat_crypto_get_instance_node(int node)
> }
>
> if (!accel_dev) {
> - pr_info("QAT: Could not find a device on node %d\n", node);
> + pr_debug_ratelimited("QAT: Could not find a device on node %d\n", node);
> /* Get any started device */
> list_for_each_entry(tmp_dev, adf_devmgr_get_head(), list) {
> if (adf_dev_started(tmp_dev) &&
> --
> 2.39.1
>
Thanks, the fix seems to be working. It was tested on "Intel(R) Xeon(R)
Platinum 8468H / Sapphire Rapids 4 skt (SPR) XCC-SP, Qual E-3
stepping" machine with 8086:4940 (rev 40) QAT device:
Without the fix:
# dmesg | grep "QAT: Could not find a device" | wc -l
498
With the fix:
# dmesg | grep "QAT: Could not find a device"
<not output>
So,
Reviewed-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Tested-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Best regards,
Vladis Dronov | Red Hat, Inc. | The Core Kernel | Senior Software Engineer
