netdev - Re: [PATCH ethtool-next v2 2/2] netlink: add netlink handler for get rss (-x)

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Date:   Fri, 23 Dec 2022 11:50:49 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Francois Romieu <romieu@...zoreil.com>
Cc:     "Mogilappagari, Sudheer" <sudheer.mogilappagari@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "corbet@....net" <corbet@....net>,
        "Samudrala, Sridhar" <sridhar.samudrala@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        stephen@...workplumber.org
Subject: Re: [PATCH ethtool-next v2 2/2] netlink: add netlink handler for
 get rss (-x)

On Fri, 23 Dec 2022 12:08:16 +0100 Francois Romieu wrote:
> > Hex would be great, but AFAIR JSON does not support hex :(
> > Imagine dealing with this in python, or bash. Do you really
> > want the values to be strings? They will have to get converted 
> > manually to integers. So I think just making them integers is
> > best, JSON is for machines not for looking at...  
> 
> 'ip' json output does not use the suggested format.
> 
> It may be interesting to know if the experience proved it to be
> a poor choice.

Hopefully without sounding impolite let me clarify that it is precisely
*experience* using the JSON output of ip extensively in Python and Ruby
(chef) which leads me to make the suggestion.

I made the same mistake in bpftool's JSON output, formatting binary
data as hex strings so it "looks nice" :(

Unfortunately we consider JSON output to be uAPI-like so we can't
change the format now :(