linux-kernel - Re: [PATCH] drivers: connector: cn_proc: allow limiting certain messages

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Message-ID: <20200217175209.GM24152@zorba>
Date:   Mon, 17 Feb 2020 17:52:11 +0000
From:   "Daniel Walker (danielwa)" <danielwa@...co.com>
To:     Evgeniy Polyakov <zbr@...emap.net>
CC:     David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: connector: cn_proc: allow limiting certain
 messages

On Mon, Feb 17, 2020 at 08:44:35PM +0300, Evgeniy Polyakov wrote:
>    Hi Daniel, David
>     
>    17.02.2020, 20:26, "Daniel Walker (danielwa)" <danielwa@...co.com>:
>    > On Sun, Feb 16, 2020 at 06:44:43PM -0800, David Miller wrote:
>    >>  This is a netlink based facility, therefore please you should add
>    filtering
>    >>  capabilities to the netlink configuration and communications path.
>    >>
>    >>  Module parameters are quite verboten.
>    >
>    > How about adding in Kconfig options to limit the types of messages? The
>    issue
>    > with this interface is that it's very easy for someone to enable the
>    interface
>    > as a listener, then never turn the interface off. Then it becomes a
>    broadcast
>    > interface. It's desirable to limit the more noisy messages in some
>    cases.
>     
>     
>    Compile-time options are binary switches which live forever after kernel
>    config has been created, its not gonna help those who enabled messages.
>    Kernel modules are kind of no-go, since it requires reboot to change in
>    some cases.
>     
>    Having netlink control from userspace is a nice option, and connector has
>    simple userspace->kernelspace channel,
>    but it requires additional userspace utils or programming, which is still
>    cumbersome.
>     
>    What about sysfs interface with one file per message type?

You mean similar to the module parameters I've done, but thru sysfs ? It would
work for Cisco. I kind of like Kconfig because it also reduces kernel size for
messages you may never want to see.

Daniel