linux-kernel - Re: [PATCH v2 iproute2-next 3/3] rdma: Adjust man page for rdma system set privileged

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Message-ID: <87zg0856io.fsf@nvidia.com>
Date:   Tue, 24 Oct 2023 18:09:05 +0200
From:   Petr Machata <petrm@...dia.com>
To:     Patrisious Haddad <phaddad@...dia.com>
CC:     <jgg@...pe.ca>, <leon@...nel.org>, <dsahern@...il.com>,
        <stephen@...workplumber.org>, <netdev@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>, <huangjunxian6@...ilicon.com>,
        <michaelgur@...dia.com>
Subject: Re: [PATCH v2 iproute2-next 3/3] rdma: Adjust man page for rdma
 system set privileged_qkey command


Patrisious Haddad <phaddad@...dia.com> writes:

> Signed-off-by: Patrisious Haddad <phaddad@...dia.com>
> Reviewed-by: Michael Guralnik <michaelgur@...dia.com>
> ---
>  man/man8/rdma-system.8 | 32 +++++++++++++++++++++++++++-----
>  1 file changed, 27 insertions(+), 5 deletions(-)
>
> diff --git a/man/man8/rdma-system.8 b/man/man8/rdma-system.8
> index ab1d89fd..a2914eb8 100644
> --- a/man/man8/rdma-system.8
> +++ b/man/man8/rdma-system.8
> @@ -23,16 +23,16 @@ rdma-system \- RDMA subsystem configuration
>  
>  .ti -8
>  .B rdma system set
> -.BR netns
> -.BR NEWMODE
> +.BR netns/privileged_qkey
> +.BR NEWMODE/NEWSTATE

What is this netns/priveleged_qkey syntax? I thought they are
independent options. If so, the way to express it is:

	rdma system set [netns NEWMODE] [privileged_qkey NEWSTATE]

Also, your option is not actually privileged_qkey, but privileged-qkey.

>  .ti -8
>  .B rdma system help
>  
>  .SH "DESCRIPTION"
> -.SS rdma system set - set RDMA subsystem network namespace mode
> +.SS rdma system set - set RDMA subsystem network namespace mode or privileged qkey mode
>  
> -.SS rdma system show - display RDMA subsystem network namespace mode
> +.SS rdma system show - display RDMA subsystem network namespace mode and privileged qkey state

Maybe make it just something like "configure RDMA system settings" or
whatever the umbrella term is? The next option will certainly have to do
something, this doesn't scale.

Plus the lines are waaay over 80, even over 90 that I think I've seen
Stephen or David mention as OK for iproute2 code.

>  .PP
>  .I "NEWMODE"
> @@ -49,12 +49,21 @@ network namespaces is not needed, shared mode can be used.
>  
>  It is preferred to not change the subsystem mode when there is active
>  RDMA traffic running, even though it is supported.
> +.PP
> +.I "NEWSTATE"
> +- specifies the new state of the privileged_qkey parameter. Either enabled or disabled.
> +Whereas this decides whether a non-privileged user is allowed to specify a controlled
> +QKEY or not, since such QKEYS are considered privileged.
> +
> +When this parameter is enabled, non-privileged users will be allowed to
> +specify a controlled QKEY.

This is missing syntax notes. One might think that to enable it they
need to say "enable", but in fact it's "on", and "off" for disabled.
There should be an "{on | off}" somewhere in there.

Also, line length.

Also, the paragraph is imho a bit long-winded. Maybe make it just this?

	determines whether a non-privileged user is allowed to specify a
        controlled QKEY or not.

>  .SH "EXAMPLES"
>  .PP
>  rdma system show
>  .RS 4
> -Shows the state of RDMA subsystem network namespace mode on the system.
> +Shows the state of RDMA subsystem network namespace mode on the system and
> +the state of privileged qkey parameter.
>  .RE
>  .PP
>  rdma system set netns exclusive
> @@ -69,6 +78,19 @@ Sets the RDMA subsystem in network namespace shared mode. In this mode RDMA devi
>  are shared among network namespaces.
>  .RE
>  .PP
> +.PP
> +rdma system set privileged_qkey enabled
> +.RS 4
> +Sets the privileged_qkey parameter to enabled. In this state non-privileged user
> +is allowed to specify a controlled QKEY.
> +.RE
> +.PP
> +rdma system set privileged_qkey disabled
> +.RS 4
> +Sets the privileged_qkey parameter to disabled. In this state non-privileged user
> +is *not* allowed to specify a controlled QKEY.
> +.RE
> +.PP

on | off, not enabled | disabled.

>  .SH SEE ALSO
>  .BR rdma (8),