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From: satyavalli rama <satyavalli.rama@gmail.com>
To: dev@dpdk.org, users@dpdk.org
Subject: [dpdk-users] Fwd: l2fwd application are not sending continuous packets .
Date: Mon, 6 Jan 2020 11:25:22 +0530
Message-ID: <CAECt3bPG__2Lz_fLhRtr4oPfWNaSz+-RGvj4N86GbjxSMOa5rA@mail.gmail.com> (raw)
In-Reply-To: <CAMJ3rejbOZ5mzOYyNPFqVk-Scs7CTaVZLUQOd-GMnVpaYf+pmg@mail.gmail.com>

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

  parent reply	other threads:[~2020-01-06  5:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-04  7:24 [dpdk-users] " Rohit kamble
     [not found] ` <CAMJ3rejbOZ5mzOYyNPFqVk-Scs7CTaVZLUQOd-GMnVpaYf+pmg@mail.gmail.com>
2020-01-06  5:55   ` satyavalli rama [this message]
2020-01-06  7:07     ` satyavalli rama
2020-01-09  1:55     ` satyavalli rama
2020-01-09  6:12       ` [dpdk-users] [dpdk-dev] " Stephen Hemminger
2020-01-09 10:34         ` satyavalli rama
2020-08-17 10:41     ` [dpdk-users] Ipsec-secgw packet processing satyavalli rama
2020-08-18 10:37       ` satyavalli rama
2020-08-18 10:59         ` [dpdk-users] [dpdk-dev] " Anoob Joseph
2020-08-19 11:08           ` satyavalli rama
2020-08-26 11:23             ` satyavalli rama
2020-08-31  5:17               ` [dpdk-users] [EXT] " Anoob Joseph
2020-08-31 12:47                 ` Pathak, Pravin
2020-09-01 11:07                   ` [dpdk-users] [dpdk-dev] [EXT] " Iremonger, Bernard

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