netdev - Re: [PATCH net v2] tools/net/ynl: fix cli.py --subscribe feature

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Message-ID: <CAD4GDZwZ1WW-L_+yvj7QHnGRTv0M6QpP3KpL38SbUSMt8dqwMQ@mail.gmail.com>
Date: Wed, 4 Sep 2024 18:21:45 +0100
From: Donald Hunter <donald.hunter@...il.com>
To: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc: netdev@...r.kernel.org, kuba@...nel.org, davem@...emloft.net, 
	edumazet@...gle.com, pabeni@...hat.com, jiri@...nulli.us, 
	jacob.e.keller@...el.com, liuhangbin@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] tools/net/ynl: fix cli.py --subscribe feature

On Wed, 4 Sept 2024 at 14:55, Arkadiusz Kubalewski
<arkadiusz.kubalewski@...el.com> wrote:
>
> Execution of command:
> ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/dpll.yaml /
>         --subscribe "monitor" --sleep 10
> fails with:
>   File "/repo/./tools/net/ynl/cli.py", line 109, in main
>     ynl.check_ntf()
>   File "/repo/tools/net/ynl/lib/ynl.py", line 924, in check_ntf
>     op = self.rsp_by_value[nl_msg.cmd()]
> KeyError: 19
>
> Parsing Generic Netlink notification messages performs lookup for op in
> the message. The message was not yet decoded, and is not yet considered
> GenlMsg, thus msg.cmd() returns Generic Netlink family id (19) instead of
> proper notification command id (i.e.: DPLL_CMD_PIN_CHANGE_NTF=13).
>
> Allow the op to be obtained within NetlinkProtocol.decode(..) itself if the
> op was not passed to the decode function, thus allow parsing of Generic
> Netlink notifications without causing the failure.
>
> Suggested-by: Donald Hunter <donald.hunter@...il.com>
> Link: https://lore.kernel.org/netdev/m2le0n5xpn.fsf@gmail.com/
> Fixes: 0a966d606c68 ("tools/net/ynl: Fix extack decoding for directional ops")
> Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>

Reviewed-by: Donald Hunter <donald.hunter@...il.com>