netdev - Re: [PATCH net-next v2 02/10] doc/netlink: Document the genetlink-legacy schema extensions

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Date: Wed, 16 Aug 2023 09:25:08 +0100
From: Donald Hunter <donald.hunter@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org,  "David S. Miller" <davem@...emloft.net>,  Eric
 Dumazet <edumazet@...gle.com>,  Paolo Abeni <pabeni@...hat.com>,  Jonathan
 Corbet <corbet@....net>,  linux-doc@...r.kernel.org,  Stanislav Fomichev
 <sdf@...gle.com>,  Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
  donald.hunter@...hat.com
Subject: Re: [PATCH net-next v2 02/10] doc/netlink: Document the
 genetlink-legacy schema extensions

Jakub Kicinski <kuba@...nel.org> writes:

> On Tue, 15 Aug 2023 20:42:46 +0100 Donald Hunter wrote:
>> Add description of genetlink-legacy specific attributes to the ynl spec
>> documentation.
>> 
>> Signed-off-by: Donald Hunter <donald.hunter@...il.com>
>> ---
>>  Documentation/userspace-api/netlink/specs.rst | 47 +++++++++++++++++++
>>  1 file changed, 47 insertions(+)
>
> Should we merge this with genetlink-legacy.rst?

Sure, I can do that.

>
>> diff --git a/Documentation/userspace-api/netlink/specs.rst b/Documentation/userspace-api/netlink/specs.rst
>> index 2e4acde890b7..dde70f9674d4 100644
>> --- a/Documentation/userspace-api/netlink/specs.rst
>> +++ b/Documentation/userspace-api/netlink/specs.rst
>> @@ -443,3 +443,50 @@ nest
>>  
>>  Attribute containing other (nested) attributes.
>>  ``nested-attributes`` specifies which attribute set is used inside.
>> +
>> +genetlink-legacy
>> +================
>> +
>> +The genetlink-legacy schema extends the genetlink schema with some additional
>> +properties that are needed to support legacy genetlink families.
>> +
>> +Globals
>> +-------
>> +
>> + - ``kernel-policy`` - Specify whether the kernel input policy is ``global``,
>> +   ``per-op`` or ``split``.
>
> Maybe a few more words:
>
>  Specify whether the kernel input policy is ``global`` i.e. the same for
>  all operation of the family, defined for each operation individually 
>  (``per-op``), or separately for each operation and operation type
>  (do vs dump) - ``split``.

Ack. As an aside, what do we mean by "kernel input policy"?

>> +   ``per-op`` or ``split``.
>
>> +Struct definitions
>> +------------------
>> +
>> +There is a new type of definition called ``struct`` which is used for declaring
>> +the C struct format of fixed headers and binary attributes.
>> +
>> +members
>> +~~~~~~~
>> +
>> + - ``name`` - The attribute name of the struct member
>> + - ``type`` - One of the scalar types ``u8``, ``u16``, ``u32``, ``u64``, ``s8``,
>> +   ``s16``, ``s32``, ``s64``, ``string`` or ``binary``.
>> + - ``byte-order`` - ``big-endian`` or ``little-endian``
>> + - ``doc``, ``enum``, ``enum-as-flags``, ``display-hint`` - Same as for
>> +   attribute definitions.
>
> Hm, genetlink-legacy.rst has this:
>
> https://docs.kernel.org/next/userspace-api/netlink/genetlink-legacy.html#structures
>
> But the larger section is called "Other quirks (todo)"
> I guess you have tackled most of the items in this section
> so we shouldn't call it "todo" ?

I'll clean up genetlink-legacy.rst when I merge these changes.

Thanks for the review!