Re: [dpdk-dev] FW: nic loopback

[alex <alex@weka.io>]

On Wed, Oct 22, 2014 at 7:37 AM, Zhu, Heqing <heqing.zhu@intel.com> wrote:

> One line comment inline.
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Liang, Cunming
> > Sent: Tuesday, October 21, 2014 8:33 PM
> > To: Alex Markuze
> > Cc: dev@dpdk.org
> > Subject: Re: [dpdk-dev] nic loopback
> >
> > It’s a pain VF can’t set the register directly.
> > As kernel ixgbe don’t support to set the value, I’m afraid you have to
> modify
> > kernel ixgbe.
> > If your purpose is mainly for testing purpose.
> > One option is you can just set the register bit value to full 1 during
> device
> > initialization.
> > Another option is you can choose to use DPDK as host PF.
> > Running testpmd in host, and set such register by interactive command
> line.
> >
> > Ideally it’s better to add a kind of VF to PF mailbox message.
> > Host PF delegate VF to enable the local pool loopback.
> > So during runtime, VF can proactive to enable/disable the ability.
>
> [heqing] Such a proposal has been discussed a few times, but the kernel
> driver does not accept this due to the security concern.


I will try a different approach, Is there a tool available by intel for
82599 nics that can access the NIC's configuration and modify these
registers manually? w/o Modifying hypervisor drivers and/or using PF?

>
> >
> >
> > From: Alex Markuze [mailto:alex@weka.io]
> > Sent: Tuesday, October 21, 2014 11:16 PM
> > To: Liang, Cunming
> > Cc: dev@dpdk.org
> > Subject: Re: [dpdk-dev] nic loopback
> >
> > How can I set/query this bit (LLE(PFVMTXSW[n]), intel 82599 ) on ESX, or
> any
> > other friendlier environment like Linux?
> >
> > On Tue, Oct 21, 2014 at 4:18 AM, Liang, Cunming
> > <cunming.liang@intel.com<mailto:cunming.liang@intel.com>> wrote:
> >
> >
> > > -----Original Message-----
> > > From: dev
> > [mailto:dev-bounces@dpdk.org<mailto:dev-bounces@dpdk.org>]
> > > On Behalf Of Alex Markuze
> > > Sent: Tuesday, October 21, 2014 12:24 AM
> > > To: dev@dpdk.org<mailto:dev@dpdk.org>
> > > Subject: [dpdk-dev] nic loopback
> > >
> > > Hi,
> > > I'm trying to send packets from an application to it self, meaning
> > > smac  == dmac.
> > > I'm working with intel 82599 virtual function. But it seems that these
> > > packets are lost.
> > >
> > > Is there a software/hw limitation I'm missing here (some additional
> > > anti-spoofing)? AFAIK modern NICs with sriov are mini switches so the
> > > hw loopback should work, at least thats the theory.
> > >
> > [Liang, Cunming] You could have a check on register LLE(PFVMTXSW[n]).
> > Which allow an individual pool to be able to send traffic and have it
> loopback
> > to itself.
> > >
> > > Thanks.
>
>