Hi We have a user mode DPDK or non-DPDK application that needs to receive and transmit packet from/to VPP. We plan use memif interface in VPP and use memif in the application. Could you provide some guidelines on which mode (master or slave) the memif interface needs to be created in VPP and in the application? We would like to achieve 0 memory copy in both direction.
<------------------------ VPP -------------------------------> < my-user-mode-application/DPDK app> NIC----> VPP DPDK rx-poll-----------> My-VPP_plugin----->memif interface------------>rx packet without packet copy, in the same rx buffer from NIC NIC<---- VPP DPDK rx-poll<----------- My-VPP_plugin<-----memif interface<------------tx packet without packet copy, in the same tx buffer to NIC DPDK memif PMD supports 0 copy in slave mode. Does it mean VPP needs to be in memif-master? Will it achieve the 0 copy all the to and from the NIC? I read that VPP does not use DPDK memif PMD and has it own memif implementation. If a packet is copied from memif shared memory buffer to NIC memory pool buffer does it occur it the memif rx or later when the packet is forwarded on another interface? Any advice or guidance on this would be greatly appreciated. Thank you very much!
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