ice: implement new LLDP filter command

There is an issue with some NVMs where an already existent LLDP
filter is blocking the creation of a filter to allow LLDP packets
to be redirected to the default VSI for the interface.  This is
blocking all LLDP functionality based in the kernel when the FW
LLDP agent is disabled (e.g. software based DCBx).

Implement the new AQ command to allow adding VSI destinations to
existent filters on NVM versions that support the new command.

The new lldp_fltr_ctrl AQ command supports Rx filters only, so the
code flow for adding filters to disable Tx of control frames will
remain intact.

Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 607d33d05a0c..45d5445a0456 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -4366,3 +4366,50 @@ ice_aq_set_lldp_mib(struct ice_hw *hw, u8 mib_type, void *buf, u16 buf_size,
 
 	return ice_aq_send_cmd(hw, &desc, buf, buf_size, cd);
 }
+
+/**
+ * ice_fw_supports_lldp_fltr - check NVM version supports lldp_fltr_ctrl
+ * @hw: pointer to HW struct
+ */
+bool ice_fw_supports_lldp_fltr_ctrl(struct ice_hw *hw)
+{
+	if (hw->mac_type != ICE_MAC_E810)
+		return false;
+
+	if (hw->api_maj_ver == ICE_FW_API_LLDP_FLTR_MAJ) {
+		if (hw->api_min_ver > ICE_FW_API_LLDP_FLTR_MIN)
+			return true;
+		if (hw->api_min_ver == ICE_FW_API_LLDP_FLTR_MIN &&
+		    hw->api_patch >= ICE_FW_API_LLDP_FLTR_PATCH)
+			return true;
+	} else if (hw->api_maj_ver > ICE_FW_API_LLDP_FLTR_MAJ) {
+		return true;
+	}
+	return false;
+}
+
+/**
+ * ice_lldp_fltr_add_remove - add or remove a LLDP Rx switch filter
+ * @hw: pointer to HW struct
+ * @vsi_num: absolute HW index for VSI
+ * @add: boolean for if adding or removing a filter
+ */
+enum ice_status
+ice_lldp_fltr_add_remove(struct ice_hw *hw, u16 vsi_num, bool add)
+{
+	struct ice_aqc_lldp_filter_ctrl *cmd;
+	struct ice_aq_desc desc;
+
+	cmd = &desc.params.lldp_filter_ctrl;
+
+	ice_fill_dflt_direct_cmd_desc(&desc, ice_aqc_opc_lldp_filter_ctrl);
+
+	if (add)
+		cmd->cmd_flags = ICE_AQC_LLDP_FILTER_ACTION_ADD;
+	else
+		cmd->cmd_flags = ICE_AQC_LLDP_FILTER_ACTION_DELETE;
+
+	cmd->vsi_num = cpu_to_le16(vsi_num);
+
+	return ice_aq_send_cmd(hw, &desc, NULL, 0, NULL);
+}