ice: Add code to process LLDP MIB change events

This patch adds support to process LLDP MIB change notifications sent
by the firmware.
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ice/ice_dcb.c

@@ -588,8 +588,7 @@ ice_parse_org_tlv(struct ice_lldp_org_tlv *tlv, struct ice_dcbx_cfg *dcbcfg)
  *
  * Parse DCB configuration from the LLDPDU
  */
-static enum ice_status
-ice_lldp_to_dcb_cfg(u8 *lldpmib, struct ice_dcbx_cfg *dcbcfg)
+enum ice_status ice_lldp_to_dcb_cfg(u8 *lldpmib, struct ice_dcbx_cfg *dcbcfg)
 {
 	struct ice_lldp_org_tlv *tlv;
 	enum ice_status ret = 0;
@@ -871,7 +870,7 @@ ice_get_ieee_or_cee_dcb_cfg(struct ice_port_info *pi, u8 dcbx_mode)
  *
  * Get DCB configuration from the Firmware
  */
-static enum ice_status ice_get_dcb_cfg(struct ice_port_info *pi)
+enum ice_status ice_get_dcb_cfg(struct ice_port_info *pi)
 {
 	struct ice_aqc_get_cee_dcb_cfg_resp cee_cfg;
 	struct ice_dcbx_cfg *dcbx_cfg;

drivers/net/ethernet/intel/ice/ice_dcb.h

@@ -121,6 +121,8 @@ struct ice_cee_app_prio {
 } __packed;
 
 u8 ice_get_dcbx_status(struct ice_hw *hw);
+enum ice_status ice_lldp_to_dcb_cfg(u8 *lldpmib, struct ice_dcbx_cfg *dcbcfg);
+enum ice_status ice_get_dcb_cfg(struct ice_port_info *pi);
 enum ice_status ice_set_dcb_cfg(struct ice_port_info *pi);
 enum ice_status ice_init_dcb(struct ice_hw *hw);
 enum ice_status

drivers/net/ethernet/intel/ice/ice_dcb_lib.c

@@ -320,3 +320,39 @@ int ice_init_pf_dcb(struct ice_pf *pf)
 	dev_err(dev, "DCB init failed\n");
 	return err;
 }
+
+/**
+ * ice_dcb_process_lldp_set_mib_change - Process MIB change
+ * @pf: ptr to ice_pf
+ * @event: pointer to the admin queue receive event
+ */
+void
+ice_dcb_process_lldp_set_mib_change(struct ice_pf *pf,
+				    struct ice_rq_event_info *event)
+{
+	if (pf->dcbx_cap & DCB_CAP_DCBX_LLD_MANAGED) {
+		struct ice_dcbx_cfg *dcbcfg, *prev_cfg;
+		int err;
+
+		prev_cfg = &pf->hw.port_info->local_dcbx_cfg;
+		dcbcfg = devm_kmemdup(&pf->pdev->dev, prev_cfg,
+				      sizeof(*dcbcfg), GFP_KERNEL);
+		if (!dcbcfg)
+			return;
+
+		err = ice_lldp_to_dcb_cfg(event->msg_buf, dcbcfg);
+		if (!err)
+			ice_pf_dcb_cfg(pf, dcbcfg);
+
+		devm_kfree(&pf->pdev->dev, dcbcfg);
+
+		/* Get updated DCBx data from firmware */
+		err = ice_get_dcb_cfg(pf->hw.port_info);
+		if (err)
+			dev_err(&pf->pdev->dev,
+				"Failed to get DCB config\n");
+	} else {
+		dev_dbg(&pf->pdev->dev,
+			"MIB Change Event in HOST mode\n");
+	}
+}

drivers/net/ethernet/intel/ice/ice_dcb_lib.h

@@ -11,6 +11,9 @@
 u8 ice_dcb_get_ena_tc(struct ice_dcbx_cfg *dcbcfg);
 u8 ice_dcb_get_num_tc(struct ice_dcbx_cfg *dcbcfg);
 int ice_init_pf_dcb(struct ice_pf *pf);
+void
+ice_dcb_process_lldp_set_mib_change(struct ice_pf *pf,
+				    struct ice_rq_event_info *event);
 #else
 static inline u8 ice_dcb_get_ena_tc(struct ice_dcbx_cfg __always_unused *dcbcfg)
 {
@@ -28,5 +31,6 @@ static inline int ice_init_pf_dcb(struct ice_pf *pf)
 	return -EOPNOTSUPP;
 }
 
+#define ice_dcb_process_lldp_set_mib_change(pf, event) do {} while (0)
 #endif /* CONFIG_DCB */
 #endif /* _ICE_DCB_LIB_H_ */

drivers/net/ethernet/intel/ice/ice_main.c

@@ -936,6 +936,9 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)
 		case ice_aqc_opc_fw_logging:
 			ice_output_fw_log(hw, &event.desc, event.msg_buf);
 			break;
+		case ice_aqc_opc_lldp_set_mib_change:
+			ice_dcb_process_lldp_set_mib_change(pf, &event);
+			break;
 		default:
 			dev_dbg(&pf->pdev->dev,
 				"%s Receive Queue unknown event 0x%04x ignored\n",