[PATCH v1 5/6] net/ice/base: add pending admin queue events API

[Soumyadeep Hore <soumyadeep.hore@intel.com>]

From: Pawel Sobczyk <pawel.sobczyk@intel.com>

Adds a new API ice_ctrlq_pending() to check if there
are pending messages in the admin control queue. The
function is intended to be called after clearing the
ADMINQ_EVENT_PENDING flag to ensure all pending
messages are processed before re-enabling interrupts.

Signed-off-by: Pawel Sobczyk <pawel.sobczyk@intel.com>
Signed-off-by: Soumyadeep Hore <soumyadeep.hore@intel.com>
---
 drivers/net/intel/ice/base/ice_common.h   |  1 +
 drivers/net/intel/ice/base/ice_controlq.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/net/intel/ice/base/ice_common.h b/drivers/net/intel/ice/base/ice_common.h
index 884b8f7834..3e9d3c2f80 100644
--- a/drivers/net/intel/ice/base/ice_common.h
+++ b/drivers/net/intel/ice/base/ice_common.h
@@ -148,6 +148,7 @@ ice_aq_ena_dis_txtimeq(struct ice_hw *hw, u16 txtimeq, u16 q_count, bool q_ena,
 extern const struct ice_ctx_ele ice_txtime_ctx_info[];
 
 bool ice_check_sq_alive(struct ice_hw *hw, struct ice_ctl_q_info *cq);
+bool ice_ctrlq_pending(struct ice_hw *hw, struct ice_ctl_q_info *cq);
 int ice_aq_q_shutdown(struct ice_hw *hw, bool unloading);
 void ice_fill_dflt_direct_cmd_desc(struct ice_aq_desc *desc, u16 opcode);
 extern const struct ice_ctx_ele ice_tlan_ctx_info[];
diff --git a/drivers/net/intel/ice/base/ice_controlq.c b/drivers/net/intel/ice/base/ice_controlq.c
index b210495827..d68e603a8c 100644
--- a/drivers/net/intel/ice/base/ice_controlq.c
+++ b/drivers/net/intel/ice/base/ice_controlq.c
@@ -965,6 +965,22 @@ static bool ice_sq_done(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 	return rd32(hw, cq->sq.head) == cq->sq.next_to_use;
 }
 
+/**
+ * ice_ctrlq_pending - check if there are pending messages on the control queue
+ * @hw: pointer to the HW struct
+ * @cq: pointer to the specific Control queue
+ *
+ * Returns: true if there are pending messages in a queue (i.e. next_to_clean
+ *          does not match the hardware head register), false otherwise
+ */
+bool ice_ctrlq_pending(struct ice_hw *hw, struct ice_ctl_q_info *cq)
+{
+	u16 ntu;
+
+	ntu = (u16)(rd32(hw, cq->rq.head) & cq->rq.head_mask);
+	return cq->rq.next_to_clean != ntu;
+}
+
 /**
  * ice_sq_send_cmd_nolock - send command to a control queue
  * @hw: pointer to the HW struct
-- 
2.47.1