Re: [dpdk-dev] [PATCH 1/2] app/testpmd: add custom topology command

[Kevin Traynor <ktraynor@redhat.com>]

On 05/15/2018 03:05 PM, Wisam Monther wrote:
> Hey Kevin,
> 
> What if I have 10 ports and want all 9 ports to forward packets to port
> 0, this cannot done in paired.
> But with this topo the user can overwrite the topo.
> E.g:
> - Set custom-topo 1 0
> Will make those paired and those two as active only.
> 
> - set custom-topo 2 0
> Will make those two as paired, but still port one will forward packets
> to 0.
> And the active ports will be 3 ports (0,1,2)
> And so on...
> With this topo you can create your own topo. (Mixed between all topos or
> even non-pattern topo for any usage)
> In my case its needed for representors and virtio.
> 
> Any traffic coming from representors/vhost (from VM) need to be
> forwarded from PF/phy port to the wire.
> 

Thanks for sharing the use case.

Will it be an issue that multiple cores may be sending to the same TxQ?
I didn't check to see if there is locking provided in the app.

> This new topo is useful for such cases.
> 
> BRs,
> Wisam jaddo
>