netdev - Re: [RFC 0/3] netlink: extended error reporting

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Message-ID: <20170407190204.GA22810@salvia>
Date:   Fri, 7 Apr 2017 21:02:04 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     David Miller <davem@...emloft.net>
Cc:     johannes@...solutions.net, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC 0/3] netlink: extended error reporting

On Fri, Apr 07, 2017 at 11:53:15AM -0700, David Miller wrote:
> From: Johannes Berg <johannes@...solutions.net>
> Date: Fri,  7 Apr 2017 20:26:17 +0200
> 
> > So this is my first draft of what we'd talked about at netconf.
> > I'm not super happy with the way we have to pass the extended
> > error struct, but I don't see a way to implement reporting any
> > dynamic information (like error offsets) in any other way.
> > 
> > Alexander Shishkin had a nice way of reporting static extended
> > error data, but that isn't really suitable for reporting the
> > offset or even reporting the broken attribute from nla_parse().
> > 
> > Speaking of nla_parse(), that'll be somewhat complicated to do
> > since we'll have to track the offsets of where we're parsing,
> > but it might be possible since the nlattrs are just pointers
> > into the message, so (optionally?) passing the skb as well can
> > allow us to fill the offset information.
> 
> I like it, nice work.
> 
> I know people want dynamically generated strings and stuff, and we can
> get there, but I prefer that the first thing we commit is super simple.
> 
> Someone gave me a hard time about the fact that we've been talking
> about this idea for years but nothing ever happens.
> 
> I'm tempted to apply this as-is just to show that person that things
> do in fact happen.... eventually :-)

We can just send follow up patches to refine, I think it's a good
start, Johannes?

BTW, for this co-authored effort in designing this:

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>

Thanks!