[dpdk-dev] l2fwd application are not sending continuous packets .
satyavalli rama
satyavalli.rama at gmail.com
Thu Jan 9 02:55:45 CET 2020
Can anyone please help us with this?
On Mon, Jan 6, 2020, 11:25 satyavalli rama <satyavalli.rama at gmail.com>
wrote:
>
>
>
> 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
>
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