add_priority

Adds a priority mapping to the NMSettingVlan:ingress_priority_map or NMSettingVlan:egress_priority_map properties of the setting.

If from is already in the given priority map, this function will overwrite the existing entry with the new to.

If map is INGRESS_MAP then from is the incoming 802.1q VLAN Priority Code Point (PCP) value, and to is the Linux SKB priority value.

If map is EGRESS_MAP then from is the Linux SKB priority value and to is the outgoing 802.1q VLAN Priority Code Point (PCP) value.

Parameters:

this	the SettingVlan
map	the type of priority map
from	the priority to map to to
to	the priority to map from to

Returns:

true if the new priority mapping was successfully added to the list, false if error