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Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property
From: |
Zhi Yong Wu |
Subject: |
Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property |
Date: |
Mon, 11 Jun 2012 22:24:53 +0800 |
On Mon, Jun 11, 2012 at 4:57 PM, Stefan Hajnoczi
<address@hidden> wrote:
> On Mon, Jun 11, 2012 at 08:28:57AM +0200, Paolo Bonzini wrote:
>> Il 09/06/2012 05:04, Zhi Yong Wu ha scritto:
>> >>>> This commit looks suspicious because it removes a user-visible qdev
>> >>>> property but we're trying to preserve backward compatibility. This
>> >>>> command-line will break:
>> >>>>
>> >>>> x86_64-softmmu/qemu-system-x86_64 -net user,vlan=1 -device
>> >>>> virtio-net-pci,vlan=1
>> >>>>
>> >>>> Instead of dropping the qdev_prop_vlan completely the
>> >>>> hw/qdev-properties.c code needs to call net/hub.h external functions
>> >>>> to implement equivalent functionality:
>> >>>>
>> >>>> 1. Setting the vlan=<id> property looks up the hub port and assigns
>> >>>> the NICConf->peer field.
>> >>>> 2. Getting the vlan property looks up the hub id (i.e. vlan id) given
>> >>>> the peer. If the peer is not a hub port the result is -1.
>> >>>>
>> >>>> When I wrote this patch I missed the big picture and forgot about
>> >>>> backwards compatibility :(.
>> >>>>
>> > To be honest, i am concerned if anyone uses this syntax. Since the
>> > feature will finally be discarded, i suggest that we don't support
>> > this now. If someone complains this later, we can fix it. If nobody
>> > complains, that is what we hope.
>>
>> I think you're missing the big picture of this series, which is exactly
>> _not_ to discard the VLAN feature, but just to rewrite it in a better way.
>>
>> That said, I agree that this is a somewhat fringe usage; most people
>> will use -net nic,model=virtio,vlan=1 rather than "-device". We may get
>> by with dropping it. I have no strong opinion either way.
>
> Either we keep backwards compatibility or we don't. Taking a middle
> path where we preserve only some of the "VLAN" syntax is confusing and
> inconsistent.
in terms of technology, i fully agree with you, but in terms of
usefulness and our business, it will waste our effort, time and is
meaningless if nobody or no customers use this syntax. As i said, if
someone complain this later, we can fix it.
>
> Like Paolo said, the point here is not to drop "VLAN" support. We're
> simply moving this feature into a regular net client (the hub) so that
> the special case "VLAN" code in net.c can be removed.
>
> Stefan
>
--
Regards,
Zhi Yong Wu
- [Qemu-devel] [PATCH v4 00/16] hub-based networking patches, zwu . kernel, 2012/06/04
- [Qemu-devel] [PATCH v4 02/16] net: Use hubs for the vlan feature, zwu . kernel, 2012/06/04
- [Qemu-devel] [PATCH v4 04/16] hub: Check that hubs are configured correctly, zwu . kernel, 2012/06/04
- [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, zwu . kernel, 2012/06/04
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Stefan Hajnoczi, 2012/06/08
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Zhi Yong Wu, 2012/06/08
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Stefan Hajnoczi, 2012/06/08
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Zhi Yong Wu, 2012/06/08
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Paolo Bonzini, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Stefan Hajnoczi, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property,
Zhi Yong Wu <=
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Stefan Hajnoczi, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Zhi Yong Wu, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Zhi Yong Wu, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Luiz Capitulino, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Zhi Yong Wu, 2012/06/11
- Re: [Qemu-devel] [PATCH v4 06/16] net: Remove vlan qdev property, Anthony Liguori, 2012/06/11
[Qemu-devel] [PATCH v4 05/16] net: Drop vlan argument to qemu_new_net_client(), zwu . kernel, 2012/06/04
[Qemu-devel] [PATCH v4 08/16] net: Remove VLANState, zwu . kernel, 2012/06/04
[Qemu-devel] [PATCH v4 13/16] net: Make "info network" output more readable info, zwu . kernel, 2012/06/04
[Qemu-devel] [PATCH v4 03/16] net: Look up 'vlan' net clients using hubs, zwu . kernel, 2012/06/04