Re: [dpdk-dev] DPDK RSS support for ixgbevf PMD

[Dor Laor <dor@cloudius-systems.com>]

On Mon, Dec 15, 2014 at 10:33 PM, Thomas Monjalon <thomas.monjalon@6wind.com
> wrote:
>
> 2014-12-15 21:11, Vladislav Zolotarov:
> > Hi,
> > I'm running an ixgbevf PMD on an AWS guests with extended networking
> > (SR-IOV functions of 82599 Intel's NIC) and noticed that even in the
> > current git tree there is no support for a multi-queue in this PMD: reta
> > size returned by rte_eth_dev_info_get() call is 0, while max_rx_queues
> and
> > max_tx_queues are both 4.
> >
> > Linux ixgbevf-2.15.3 driver on the other hand successfully initializes 2
> > RSS queues: for some reason it always limits the number of RSS queues by
> 2.
> >
> > ixgbevf_main.c: line 2539
> > u16 rss = min_t(u16, num_online_cpus(), 2);
> >
> > The above is strange since if MRQE is set to 1010b there are 4 RSS queues
> > available which seems to be the case in my AWS Guest.
> >
> > However, let's get back to DPDK. As I've mentioned above the SR-IOV
> > function i have is RSS capable (to be 100% sure I've verified both queues
> > are receiving packets in a multi-socket TCP test). And it's a shame I
> can't
> > utilize it with a DPDK.
>
> Yes, it is not yet supported.
> But a patch was recently sent:
>         http://dpdk.org/ml/archives/dev/2014-December/010028.html


Good to know and nice timing

>
> t
> > I wonder if there are any blockers to add this capability to the ixgbevf
> > PMD and if not is it scheduled to some time soon?
>
> Please jump in the above thread for your questions.
>
> My turn to ask a question:
> Does it mean DPDK is going to be supported in your system (OSv)?
>

In general yes. It's premature to ask now since there are components
that already implemented in OSv and won't be needed (efficient
producer-consumer, huge pages, etc). We sure like to reuse the driver code,
it's a pity not to contribute to the same code base. We'll certainly like
to let unmodified dpdk apps run as well

Initially we're playing w/ the Linux dpdk on the host and AWS to gain
familiarity w/ it


> I've seen it in the OSv roadmap.
> Could we have more details about how it would be integrated?
>
> Thanks
> --
> Thomas
>