ice: Add 'Execute Pending LLDP MIB' Admin Queue command

In DCB Willing Mode (FW managed LLDP), when the link partner changes
configuration which requires fewer TCs, the TCs that are no longer
needed are suspended by EMP FW, removed, and never resumed. This occurs
before a MIB change event is indicated to SW. The permanent suspension and
removal of these TC nodes in the scheduler prevents RDMA from being able
to destroy QPs associated with this TC, requiring a CORE reset to recover.

A new DCBX configuration change flow is defined to allow SW driver and
other SW components (RDMA) to properly adjust to the configuration
changes before they are taking effect in HW. This flow includes a
two-way handshake between EMP FW<->LAN SW<->RDMA SW.

List of changes:
- Add 'Execute Pending LLDP MIB' AQC.
- Add 'Pending Event Enable' bit.
- Add additional logic to ignore Pending Event Enable' request
  while 'LLDP MIB Chnage' event is disabled.
- Add 'Execute Pending LLDP MIB' AQC sending function to FW,
  which is needed to take place MIB Event change.

Signed-off-by: Tsotne Chakhvadze <[email protected]>
Co-developed-by: Karen Sornek <[email protected]>
Signed-off-by: Karen Sornek <[email protected]>
Co-developed-by: Dave Ertman <[email protected]>
Signed-off-by: Dave Ertman <[email protected]>
Co-developed-by: Anatolii Gerasymenko <[email protected]>
Signed-off-by: Anatolii Gerasymenko <[email protected]>
Tested-by: Arpana Arland <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <[email protected]>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index d02b55b6aa9c..f5842ff42bc7 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -5504,6 +5504,19 @@ ice_lldp_fltr_add_remove(struct ice_hw *hw, u16 vsi_num, bool add)
 }
 
 /**
+ * ice_lldp_execute_pending_mib - execute LLDP pending MIB request
+ * @hw: pointer to HW struct
+ */
+int ice_lldp_execute_pending_mib(struct ice_hw *hw)
+{
+	struct ice_aq_desc desc;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_lldp_execute_pending_mib);
+
+	return ice_aq_send_cmd(hw, &desc, NULL, 0, NULL);
+}
+
+/**
  * ice_fw_supports_report_dflt_cfg
  * @hw: pointer to the hardware structure
  *