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

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Date:   Fri, 07 Apr 2017 12:22:23 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     johannes@...solutions.net
Cc:     pablo@...filter.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC 0/3] netlink: extended error reporting

From: Johannes Berg <johannes@...solutions.net>
Date: Fri, 07 Apr 2017 21:09:45 +0200

> On Fri, 2017-04-07 at 21:06 +0200, Pablo Neira Ayuso wrote:
>> On Fri, Apr 07, 2017 at 08:59:12PM +0200, Johannes Berg wrote:
>> [...]
>> > Heh. I think I really want to solve - at least partially -
>> > nla_parse()
>> > to see that it can be done this way. It'd be nice to even transform
>> > all
>> > the callers (I generated half of these patches with spatch anyway)
>> > to
>> > have at least that.
>> 
>> We can just have a modified version of nla_parse that deals with
>> this.
> 
> Yes, but we need to figure out a good way to have the offset.
> 
> We also need to see if we want to *force* having the offset. In some
> sense that'd be useful, in another it might be very complicated to fill
> it in at all times, if for example errors come from lower layers like
> drivers.

It has to be optional, some kinds of errors don't have an exact
context per-se.

Also another way to look at this is that we're providing a lot of
new power and expressability.  So even if only one aspect of the
new error reporting is used it's a positive step forward.

So allow offset "0" meaning "unspecified".