Re: [RFC v1 21/22] net: parametrise mp open with a queue config

[Jakub Kicinski <kuba@kernel.org>]

On Wed, 6 Aug 2025 11:30:38 -0700 Mina Almasry wrote:
> Sorry, I was disagreeing. The flow above seems complicated. I'm
> probably missing something that requires this complication. I was
> suggesting an approach I find more straightforward. 
>
> Something like:
>   nedev_config = get_driver_defaults()
>   qcfg = get_driver_defaults()
> 
>   for each setting:
>     if qcfg[i].X is set:
>        use qcfg[i].X
>     else
>       use netdev_config.X

IMO the rules on when to override/update and reset qcfg[i].X will
get much more complicated than the extra `else if` in this logic.

Plus I suspect at some point we may want to add another layer here
for e.g. a group of queues delegated to the same container interface
(netkit, veth, ipvlan etc.) So I want to establish a clear model
rather than "optimize" for the number of u32 variables.

Most code (drivers) should never be exposed to any of this, they
consume a flattened qcfg for a reason.