Re: [PATCH v13 17/17] net: stream: add QAPI events to report connection state

[Markus Armbruster <armbru@xxxxxxxxxx>]

Markus Armbruster <armbru@xxxxxxxxxx> writes:

> Cc: Stefano Brivio
>
> Laurent Vivier <lvivier@xxxxxxxxxx> writes:
>
>> On 10/21/22 07:48, Markus Armbruster wrote:
>>> Laurent Vivier <lvivier@xxxxxxxxxx> writes:
>>> 
>>>> The netdev reports NETDEV_STREAM_CONNECTED event when the backend
>>>> is connected, and NETDEV_STREAM_DISCONNECTED when it is disconnected.
>>>
>>> Use cases?
>>
>> This is asked by Stefano Brivio to allow libvirt to detect if connection to 
>> passt is lost and to restart passt.

[...]

>>> Could similar event signalling be useful for other kinds of netdev
>>> backends?
>>
>> I was wondering, but it becomes more complicated to be generic.
>
> Making something complicated and generic where a simpler special
> solution would do is the worst.
>
> Not quite as bad (but still plenty bad) is making a few special
> solutions first, then replace them all with a generic solution.
>
> I believe we should have a good, hard think on possible applications of
> a generic solution now.
>
> There is no need to hold back this series for that.
>
> If we conclude a generic solution is called for, we better replace this
> special solution before it becomes ABI.  Either by replacing it before
> we release it, or by keeping it unstable until we replace it.

Stefano, any thoughts on this?