linux-kernel - Re: mlx5 ConnectX diagnostic misc driver

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Date:   Thu, 19 Oct 2023 08:24:51 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: mlx5 ConnectX diagnostic misc driver

> The ConnectX HW family supported by the mlx5 drivers uses an architecture
> where a FW component executes "mailbox RPCs" issued by the driver to make
> changes to the device. This results in a complex debugging environment
> where the FW component has information and complex low level state that
> needs to be accessed to userspace for debugging purposes.

You're being very dishonest towards Greg by not telling him that this
is a networking device, and the networking maintainers explicitly nacked
this backdoor. Nacked it, because you can't answer basic questions like
"what are the use cases" with more than "custom config and debug".

Whether Greg wants to take this into the "misc" pile is entirely up 
to him, but you gotta give him more context.