Hello Dpdk Team, I'm facing issue while forwarding packets in DPDK's l2fwd application. While sending 1 Lac packets from Scapy, I could see sometimes packets are sending from one VM to another VM. Before explaining issue let me explain topology.
*Topology :-=======*1) I am having 4 VMs(Virtual Machines) in same host. All these VM are running on Ubuntu 16.04.1. 2) VM-1 is used as Scapy to forward packets (Scapy version 2.4.3) . While creating packets I am giving destination mac(d-mac) address of VM-1. 3) In VM-2 am running L2 forwarding application. In this l2fwd application, I am doing simple packet forwarding by statically keeping mac address of VM-3. Code :- l2fwd_mac_updating () { ... ...... ....... *((uint64_t *)tmp) = 0xddccbbaa/*VM-3 mac address*/ + ((uint64_t)dest_portid << 40); } 4) Also in VM-3, I am doing same like VM-2, but I kept mac address of VM-4 5) In VM-4, I am using wireshark to see packets coming from VM-3. 6) In VM-2 and VM-3, I kept promiscuous mode off by commenting out rte_eth_promiscuous_enable(). --------------- --------------------- ------------------ ------------------------ | VM-1 | ----------> | VM-2 | ----------------> | VM-3 | ------------------> | VM-4 | --------------- --------------------- ------------------ ------------------------ Scapy Simple L2 forwarding Simple L2 forwarding Wireshark used for sending packets Sending all packets to Sending all packets to VM-3 VM-4 (DPDK) (DPDK) *Problem :- ======*== >From scapy VM, I am sending 1 lac packets with rate of 100 packets per second. *During problematic condition I could see packets are not getting forward from VM-3.**Problematic state is happening anytime after sending 1k packets.* This issue is not consistence but I could see this issue 8 out of 10 times. * Debugging and Observations :-=========================* When I tried to debug this issue , I could see that 1) In problematic state, rx queue of VM-3 is not getting packets, but VM-2 is sending packets properly. I checked this by using pdump of rx queue. 2) Just before problematic state in VM-3, I could see that previous packet(only one packet) instead of going to VM-4, it is coming back to again in rx queue of VM-3 and after wards I did not get any packets in rx queue. 3) I have changed rate of packet forward 10packets per second. but still see the issue. *Can anyone please help to solve this problem ? I need it urgently .* Thanks, Satya