[ovs-discuss] OVS - Userspace packet processing

[Advith Nagappa]

Thank you  again,

I am using a mininet set up (mn --switch user), which I think uses the
userspace ovs switch. (Is this assumption right? All available
documentation uses wording which gives this impression.)

To confirm this, I also have removed the openvswitch.ko in my VM.

But curiously though, ovs-vsctl show doesn't show any topology:


*root at cep-VirtualBox:/home/cep# ovs-vsctl
show204aa7ac-2ac9-4277-afcf-e7a3f17fc7c1*

This is weird because, mininet initializes two hosts (h1, h2) and one OVS
switch s1. And the ping all works fine.


and to contrast things, I loaded the openvswith.ko (./configure
--with-Linux/.... , make install, make modules_install, /sbin/modprobe
openvswitch) and ran mininet with the loaded kernel module (sudo mn)
















*root at cep-VirtualBox:/home/cep# ovs-vsctl
show6d14e9f4-de26-4332-93fe-b87e33c532f9    Bridge "s1"        Controller
"ptcp:6634"        Controller "tcp:127.0.0.1:6633
<http://127.0.0.1:6633>"            is_connected: true        fail_mode:
secure        Port "s1-eth2"            Interface "s1-eth2"        Port
"s1"            Interface "s1"                type: internal        Port
"s1-eth1"            Interface "s1-eth1"*

Regards
Advith

On Wed, Oct 19, 2016 at 9:30 AM, Chandran, Sugesh <sugesh.chandran at intel.com
> wrote:

>
>
>
>
> *Regards*
>
> *_Sugesh*
>
>
>
> *From:* Advith Nagappa [mailto:advith.nagappa at gmail.com]
> *Sent:* Wednesday, October 19, 2016 1:02 AM
> *To:* Chandran, Sugesh <sugesh.chandran at intel.com>
> *Cc:* discuss at openvswitch.org
> *Subject:* Re: [ovs-discuss] OVS - Userspace packet processing
>
>
>
> Hello Sugesh,
>
>
>
> Thank you for the response.
>
>
>
> I am using userspace OVS without DPDK. I do plan to use DPDK at a future
> point, but currently am trying to understand the behavior of a pure
> userspace ovs switch.
>
>
>
> I have put in custom DBG messages in /lib/dpif_netdev. (specifically
> dp_netdev_process_rxq_port) but this dbg message doesn't get triggered when
> I ping between two hosts connected by a OVS capable switch.
>
>
>
> I do see that in this case, the netdev_linux.c module is called, but I
> don't know who is calling this module (i.e the entry point to the ovs code
> base)
>
> *[Sugesh]It looks to me you are using kernel interfaces  in your setup,
> which is not ‘pure’ userspace openvswitch. Can you share the setup details?
> What type of interface you used to connect hosts to OVS?*
>
>
>
> Any input is appreciated.
>
>
>
> Best Regards
>
> Advith
>
>
>
>
>
> On Tue, Oct 18, 2016 at 10:37 AM, Chandran, Sugesh <
> sugesh.chandran at intel.com> wrote:
>
>
>
>
>
> *Regards*
>
> *_Sugesh*
>
>
>
> *From:* discuss [mailto:discuss-bounces at openvswitch.org] *On Behalf Of *Advith
> Nagappa
> *Sent:* Sunday, October 16, 2016 1:33 AM
> *To:* discuss at openvswitch.org
> *Subject:* [ovs-discuss] OVS - Userspace packet processing
>
>
>
> Hello,
>
> I am running OVS in  userspace (rmmod openvswitch.ko).
>
> I wanted to the entry point for a packet within the OVS code base. I.e
> which module first 'sees' the packet in pure userspace OVS.
>
> *[Sugesh] [Sugesh] Look at the INSTALL.DPDK.md <http://INSTALL.DPDK.md>
> and INSTALL.DPDK-advanced.md <http://INSTALL.DPDK-advanced.md> for the set
> up guide.*
>
> *You can start looking at the lib/dpif-netdev.c. mainly the functions such
> as dp_netdev_process_rxq_port, dp_netdev_input etc.*
>
>
>
> Best Regards
> Advith
>
>
>
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