netdev - Re: [PATCH RFC v6 1/6] dpll: spec: Add Netlink spec in YAML

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Date:   Fri, 17 Mar 2023 15:29:36 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
Cc:     Vadim Fedorenko <vadfed@...a.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
        poros <poros@...hat.com>, mschmidt <mschmidt@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "Michalik, Michal" <michal.michalik@...el.com>
Subject: Re: [PATCH RFC v6 1/6] dpll: spec: Add Netlink spec in YAML

Fri, Mar 17, 2023 at 11:05:26AM CET, jiri@...nulli.us wrote:
>Fri, Mar 17, 2023 at 01:52:44AM CET, arkadiusz.kubalewski@...el.com wrote:
>>>From: Jiri Pirko <jiri@...nulli.us>
>>>Sent: Thursday, March 16, 2023 2:45 PM
>>>
>>
>>[...]
>>
>>>>>>+attribute-sets:
>>>>>>+  -
>>>>>>+    name: dpll
>>>>>>+    enum-name: dplla
>>>>>>+    attributes:
>>>>>>+      -
>>>>>>+        name: device
>>>>>>+        type: nest
>>>>>>+        value: 1
>>>>>>+        multi-attr: true
>>>>>>+        nested-attributes: device
>>>>>
>>>>>What is this "device" and what is it good for? Smells like some leftover
>>>>>and with the nested scheme looks quite odd.
>>>>>
>>>>
>>>>No, it is nested attribute type, used when multiple devices are returned
>>>>with netlink:
>>>>
>>>>- dump of device-get command where all devices are returned, each one nested
>>>>inside it:
>>>>[{'device': [{'bus-name': 'pci', 'dev-name': '0000:21:00.0_0', 'id': 0},
>>>>             {'bus-name': 'pci', 'dev-name': '0000:21:00.0_1', 'id': 1}]}]
>>>
>>>Okay, why is it nested here? The is one netlink msg per dpll device
>>>instance. Is this the real output of you made that up?
>>>
>>>Device nest should not be there for DEVICE_GET, does not make sense.
>>>
>>
>>This was returned by CLI parser on ice with cmd:
>>$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/dpll.yaml /
>>--dump device-get
>>
>>Please note this relates to 'dump' request , it is rather expected that there
>>are multiple dplls returned, thus we need a nest attribute for each one.
>
>No, you definitelly don't need to nest them. Dump format and get format
>should be exactly the same. Please remove the nest.

Another example:
$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml --dump dev-get
[{'ifindex': 1, 'xdp-features': set()},
 {'ifindex': 2, 'xdp-features': {'basic', 'rx-sg', 'redirect'}},
 {'ifindex': 3, 'xdp-features': {'basic', 'rx-sg', 'redirect'}},
 {'ifindex': 4, 'xdp-features': set()},
 {'ifindex': 5, 'xdp-features': {'basic', 'rx-sg', 'xsk-zerocopy', 'redirect'}},
 {'ifindex': 6, 'xdp-features': {'basic', 'rx-sg', 'xsk-zerocopy', 'redirect'}}]

[...]