PFC and ETS are enabled by default only if the underlying NIC is in DCB mode. If you prefer to use only PFC, then you must remove etscfg from the dot1 -tlv property of the LLDP agent by using the following command:
# lldpadm set-agentprop -p dot1-tlv-=etscfg net0
For a list of possible values for dot1 -tlv, refer to Figure 2, Table 2, Optional TLV Units for an LLDP Agent.