netdev - Re: How to display IPv4 array?

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Date: Wed, 13 Mar 2024 10:51:42 +0800
From: Hangbin Liu <liuhangbin@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Donald Hunter <donald.hunter@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	netdev@...r.kernel.org
Subject: Re: How to display IPv4 array?

On Tue, Mar 12, 2024 at 10:01:05AM -0700, Jakub Kicinski wrote:
> On Tue, 12 Mar 2024 16:04:56 +0000 Donald Hunter wrote:
> > > "nested-array" would tell the parser to expect a nest that has attr
> > > type of value of array index, "type" is the same for all array members.
> > > The output will be the same as in case of "multi-attr", array index
> > > ignored (I don't see what it would be good for to the user).  
> > 
> > I'd say that this construct looks more like nest-type-value
> 
> type-value is sort of a decomposed array, if we have all the entries
> under one nest I reckon array extension may be more appropriate.
> 
> My gut feeling is that we should generalize the array-nest type,
> when I wrote the initial spec we didn't have sub-type. How about
> we replace array-nest with indexed-array (good name TBD), and instead
> of assuming the value is always a nest pass the type via sub-type?
> 
> For bonding probably something like:
> 
>   -
>     name: linkinfo-bond-attrs
>     name-prefix: ifla-bond-
>     attributes:
>       -
>         name: arp-ip-target
>         type: indexed-array
>         sub-type: u32
> 	byte-order: big-endian
> 
> how does that sound?
> 
> exiting array-nests would change from:
> 
>  -
>    name: bla
>    type: array-nest
>    nested-attributes: bla-attrs
> 
> to
> 
>  -
>    name: bla
>    type: indexed-array
>    sub-type: nest
>    nested-attributes: bla-attrs
> 
> But that'd mean updating all existing specs and codegen.

This looks good to me.

Thanks
Hangbin