ice: Fix bugs in control queue processing

This patch is a consolidation of multiple bug fixes for control queue
processing.

1)  In ice_clean_adminq_subtask() remove unnecessary reads/writes to
    registers. The bits PFINT_FW_CTL, PFINT_MBX_CTL and PFINT_SB_CTL
    are not set when an interrupt arrives, which means that clearing them
    again can be omitted.

2)  Get an accurate value in "pending" by re-reading the control queue
    head register from the hardware.

3)  Fix a corner case involving lost control queue messages by checking
    for new control messages (using ice_ctrlq_pending) before exiting the
    cleanup routine.

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_controlq.c b/drivers/net/ethernet/intel/ice/ice_controlq.c
index c064416..62be72f 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_controlq.c
+++ b/drivers/net/ethernet/intel/ice/ice_controlq.c
@@ -1065,8 +1065,11 @@ ice_clean_rq_elem(struct ice_hw *hw, struct ice_ctl_q_info *cq,
 
 clean_rq_elem_out:
        /* Set pending if needed, unlock and return */
-       if (pending)
+       if (pending) {
+               /* re-read HW head to calculate actual pending messages */
+               ntu = (u16)(rd32(hw, cq->rq.head) & cq->rq.head_mask);
                *pending = (u16)((ntc > ntu ? cq->rq.count : 0) + (ntu - ntc));
+       }
 clean_rq_elem_err:
        mutex_unlock(&cq->rq_lock);
 

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 7d65e0e..f3ba4f7 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -916,6 +916,21 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)
        return pending && (i == ICE_DFLT_IRQ_WORK);
 }
 
+/**
+ * ice_ctrlq_pending - check if there is a difference between ntc and ntu
+ * @hw: pointer to hardware info
+ * @cq: control queue information
+ *
+ * returns true if there are pending messages in a queue, false if there aren't
+ */
+static 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_clean_adminq_subtask - clean the AdminQ rings
  * @pf: board private structure
@@ -923,7 +938,6 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)
 static void ice_clean_adminq_subtask(struct ice_pf *pf)
 {
        struct ice_hw *hw = &pf->hw;
-       u32 val;
 
        if (!test_bit(__ICE_ADMINQ_EVENT_PENDING, pf->state))
                return;
@@ -933,9 +947,13 @@ static void ice_clean_adminq_subtask(struct ice_pf *pf)
 
        clear_bit(__ICE_ADMINQ_EVENT_PENDING, pf->state);
 
-       /* re-enable Admin queue interrupt causes */
-       val = rd32(hw, PFINT_FW_CTL);
-       wr32(hw, PFINT_FW_CTL, (val | PFINT_FW_CTL_CAUSE_ENA_M));
+       /* There might be a situation where new messages arrive to a control
+        * queue between processing the last message and clearing the
+        * EVENT_PENDING bit. So before exiting, check queue head again (using
+        * ice_ctrlq_pending) and process new messages if any.
+        */
+       if (ice_ctrlq_pending(hw, &hw->adminq))
+               __ice_clean_ctrlq(pf, ICE_CTL_Q_ADMIN);
 
        ice_flush(hw);
 }