[dpdk-dev] [PATCH 3/3] net/virtio: reject unsupported Rx multi queue modes

[Tiwei Bie]

On Wed, Oct 09, 2019 at 11:04:38AM +0300, Andrew Rybchenko wrote:
> On 10/8/19 8:46 AM, Tiwei Bie wrote:
> > On Tue, Oct 01, 2019 at 04:44:31PM +0100, Andrew Rybchenko wrote:
> > > From: Dilshod Urazov <Dilshod.Urazov at oktetlabs.ru>
> > > 
> > > This driver supports none of DCB, RSS or VMDQ modes,
> > > therefore must check and return error if configured incorrectly.
> > > 
> > > Fixes: c1f86306a026 ("virtio: add new driver")
> > > Cc: stable at dpdk.org
> > > 
> > > Signed-off-by: Dilshod Urazov <Dilshod.Urazov at oktetlabs.ru>
> > > Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
> > > ---
> > >   drivers/net/virtio/virtio_ethdev.c | 7 +++++++
> > >   1 file changed, 7 insertions(+)
> > > 
> > > diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> > > index 7261109dd..0af4fc392 100644
> > > --- a/drivers/net/virtio/virtio_ethdev.c
> > > +++ b/drivers/net/virtio/virtio_ethdev.c
> > > @@ -2071,6 +2071,13 @@ virtio_dev_configure(struct rte_eth_dev *dev)
> > >   	PMD_INIT_LOG(DEBUG, "configure");
> > >   	req_features = VIRTIO_PMD_DEFAULT_GUEST_FEATURES;
> > > +	if (rxmode->mq_mode != ETH_MQ_RX_NONE) {
> > > +		PMD_DRV_LOG(ERR,
> > > +			"Unsupported Rx multi queue mode %d",
> > > +			rxmode->mq_mode);
> > > +		return -EINVAL;
> > > +	}
> > We need similar checks for Tx as well.
> 
> OK, I'll add.
> 
> However, I'm not 100% sure about RSS. Yes, I know that virtio has
> no RSS configuration support, but it looks possible to have multi queue
> in vhost-net case.

Yeah, it's possible to have MQ in virtio.
The RSS support in virtio is still WIP.
https://github.com/oasis-tcs/virtio-spec/issues/48