crypto: qat - add rate limiting feature to qat_4xxx

The Rate Limiting (RL) feature allows to control the rate of requests
that can be submitted on a ring pair (RP). This allows sharing a QAT
device among multiple users while ensuring a guaranteed throughput.

The driver provides a mechanism that allows users to set policies, that
are programmed to the device. The device is then enforcing those policies.

Configuration of RL is accomplished through entities called SLAs
(Service Level Agreement). Each SLA object gets a unique identifier
and defines the limitations for a single service across up to four
ring pairs (RPs count allocated to a single VF).

The rate is determined using two fields:
  * CIR (Committed Information Rate), i.e., the guaranteed rate.
  * PIR (Peak Information Rate), i.e., the maximum rate achievable
    when the device has available resources.
The rate values are expressed in permille scale i.e. 0-1000.
Ring pair selection is achieved by providing a 64-bit mask, where
each bit corresponds to one of the ring pairs.

This adds an interface and logic that allow to add, update, retrieve
and remove an SLA.

Signed-off-by: Damian Muszynski <damian.muszynski@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/crypto/intel/qat/qat_common/adf_rl_admin.h b/drivers/crypto/intel/qat/qat_common/adf_rl_admin.h
new file mode 100644
index 000000000000..dd5419b7e896
--- /dev/null
+++ b/drivers/crypto/intel/qat/qat_common/adf_rl_admin.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2023 Intel Corporation */
+
+#ifndef ADF_RL_ADMIN_H_
+#define ADF_RL_ADMIN_H_
+
+#include <linux/types.h>
+
+#include "adf_rl.h"
+
+int adf_rl_send_admin_init_msg(struct adf_accel_dev *accel_dev,
+			       struct rl_slice_cnt *slices_int);
+int adf_rl_send_admin_add_update_msg(struct adf_accel_dev *accel_dev,
+				     struct rl_sla *sla, bool is_update);
+int adf_rl_send_admin_delete_msg(struct adf_accel_dev *accel_dev, u16 node_id,
+				 u8 node_type);
+
+#endif /* ADF_RL_ADMIN_H_ */