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Re: [Qemu-devel] [PATCH 4/4] virtio-net: add linkspeed and duplex settin
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net |
Date: |
Fri, 2 Mar 2018 22:22:19 +0200 |
On Fri, Mar 02, 2018 at 11:59:00AM -0500, Jason Baron wrote:
> On 03/02/2018 02:14 AM, Jason Wang wrote:
> >
> >
> > On 2018年03月02日 11:46, Jason Baron wrote:
> >> Although linkspeed and duplex can be set in a linux guest via 'ethtool
> >> -s',
> >> this requires custom ethtool commands for virtio-net by default.
> >>
> >> Introduce a new feature flag, VIRTIO_NET_F_SPEED_DUPLEX, which allows
> >> the hypervisor to export a linkspeed and duplex setting. The user can
> >> subsequently overwrite it later if desired via: 'ethtool -s'.
> >>
> >> Linkspeed and duplex settings can be set as:
> >> '-device virtio-net,speed=10000,duplex=full'
> >
> > I was thinking whether or not it's better to decide the duplex by the
> > type of backends.
> >
> > E.g userspace and vhost-kernel implement a in fact half duplex. But dpdk
> > implement a full duplex.
>
> Interesting - could this be derived only from the backend 'type'. IE:
> NET_CLIENT_DRIVER_TAP, NET_CLIENT_DRIVER_VHOST_USER...
>
>
> I was also thinking this could be specified as 'duplex=backend', in
> addition to the proposed 'duplex=full' or 'duplex=half'?
>
> Thanks,
>
> -Jason
I'd say it would make more sense to teach backends to obey what's
specified by the user. E.g. if vhost gets a duplex config,
create two threads.
But I think all that's for future, we can just fake it for
now - the current uses don't seem to particularly care about whether
virtio actually is or isn't a duplex.
> >
> > Thanks
> >
> >>
> >> where speed is [0...INT_MAX], and duplex is ["half"|"full"].
> >>
> >> Signed-off-by: Jason Baron<address@hidden>
> >> Cc: "Michael S. Tsirkin"<address@hidden>
> >> Cc: Jason Wang<address@hidden>
> >> Cc:address@hidden
> >> ---
> >
- Re: [Qemu-devel] [PATCH 1/4] eth: add speed and duplex definitions, (continued)
[Qemu-devel] [PATCH 2/4] rocker: drop local duplex definitions, Jason Baron, 2018/03/01
[Qemu-devel] [PATCH 3/4] virtio-net: use 64-bit values for feature flags, Jason Baron, 2018/03/01
[Qemu-devel] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net, Jason Baron, 2018/03/01
Re: [Qemu-devel] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net, Michael S. Tsirkin, 2018/03/02
Re: [Qemu-devel] [virtio-dev] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net, Yan Vugenfirer, 2018/03/04
Re: [Qemu-devel] [virtio-dev] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net, Jason Baron, 2018/03/06
Re: [Qemu-devel] [virtio-dev] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net, Michael S. Tsirkin, 2018/03/06
Re: [Qemu-devel] [virtio-dev] [PATCH 4/4] virtio-net: add linkspeed and duplex settings to virtio-net, Yan Vugenfirer, 2018/03/08
Re: [Qemu-devel] [PATCH 0/4] virtio-net: allow linkspeed and duplex setting, no-reply, 2018/03/01
Re: [Qemu-devel] [PATCH 0/4] virtio-net: allow linkspeed and duplex setting, no-reply, 2018/03/01
Re: [Qemu-devel] [PATCH 0/4] virtio-net: allow linkspeed and duplex setting, no-reply, 2018/03/01
Re: [Qemu-devel] [PATCH 0/4] virtio-net: allow linkspeed and duplex setting, no-reply, 2018/03/01