SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
Packets are received on three ports, two are CPGMAC_SL Ethernet ports and the third port is the CPPI host port. Received packets have a received packet priority (0 to 7, with 7 being the highest priority).
The received packet priority is the port priority for untagged packets, and the actual packet priority for priority tagged and VLAN tagged packets. The received packet priority is mapped through the receive ports associated packet priority to header packet priority mapping register to obtain the header packet priority (the CPDMA RX and TX nomenclature is reversed from the CPGMAC_SL nomenclature).
The header packet priority is mapped through the header priority to switch priority mapping register to obtain the hardware switch priority (0 to 3, with 3 being the highest priority). The header packet priority is then used as the actual transmit packet priority if the VLAN information is to be sent on egress.