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Date: Thu, 8 Nov 2012 21:13:31 +0000 From: Ben Hutchings <bhutchings@...arflare.com> To: Jason Wang <jasowang@...hat.com> CC: <mst@...hat.com>, <davem@...emloft.net>, <virtualization@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, <rusty@...tcorp.com.au>, <krkumar2@...ibm.com>, <kvm@...r.kernel.org> Subject: Re: [rfc net-next v6 3/3] virtio-net: change the number of queues through ethtool On Tue, 2012-10-30 at 18:03 +0800, Jason Wang wrote: > This patch implement the {set|get}_channels method of ethool to allow user to > change the number of queues dymaically when the device is running. This would > let the user to tune the device for specific applications. > > Signed-off-by: Jason Wang <jasowang@...hat.com> > --- > drivers/net/virtio_net.c | 43 +++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 43 insertions(+), 0 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index 8cc43e5..66fc129 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -1616,10 +1616,53 @@ static struct virtio_driver virtio_net_driver = { > #endif > }; > > +/* TODO: Eliminate OOO packets during switching */ > +static int virtnet_set_channels(struct net_device *dev, > + struct ethtool_channels *channels) > +{ > + struct virtnet_info *vi = netdev_priv(dev); > + u16 queue_pairs = channels->combined_count; > + > + /* Only two modes were support currently */ > + if (queue_pairs == 0) > + return -EINVAL; > + if (queue_pairs != vi->total_queue_pairs - 1 && queue_pairs != 1) > + return -EINVAL; You should also check that all of the other counts are == 0. > + vi->num_queue_pairs = queue_pairs > 1 ? queue_pairs + 1 : 1; This doesn't make sense. You're setting vi->num_queue_pairs to be combined_count + 1... > + BUG_ON(virtnet_set_queues(vi)); > + > + netif_set_real_num_tx_queues(dev, vi->num_queue_pairs); > + netif_set_real_num_rx_queues(dev, vi->num_queue_pairs); > + > + return 0; > +} > + > +static void virtnet_get_channels(struct net_device *dev, > + struct ethtool_channels *channels) > +{ > + struct virtnet_info *vi = netdev_priv(dev); > + > + if (vi->total_queue_pairs != 1) { > + channels->combined_count = vi->num_queue_pairs; but here you report combined_count as being vi->num_queue_pairs. Do you need to subtract 1 here? Ben. > + channels->max_combined = vi->total_queue_pairs - 1; > + } else { > + channels->combined_count = 1; > + channels->max_combined = 1; > + } > + > + channels->max_other = 0; > + channels->rx_count = 0; > + channels->tx_count = 0; > + channels->other_count = 0; > +} > + > static const struct ethtool_ops virtnet_ethtool_ops = { > .get_drvinfo = virtnet_get_drvinfo, > .get_link = ethtool_op_get_link, > .get_ringparam = virtnet_get_ringparam, > + .set_channels = virtnet_set_channels, > + .get_channels = virtnet_get_channels, > }; > > static int __init init(void) -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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