netdev - Re: [PATCH 2/2] xdp: adjust xdp redirect tracepoint to include return error code

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Date:   Fri, 18 Aug 2017 14:38:29 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        John Fastabend <john.fastabend@...il.com>
CC:     netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] xdp: adjust xdp redirect tracepoint to include return
 error code

On 08/18/2017 02:29 PM, Jesper Dangaard Brouer wrote:
> On Thu, 17 Aug 2017 12:43:18 -0700
> John Fastabend <john.fastabend@...il.com> wrote:
>
>>>>> @@ -2532,12 +2535,14 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
>>>>>   	ri->map = NULL;
>>>>>   	if (unlikely(!fwd)) {
>>>>>   		bpf_warn_invalid_xdp_redirect(index);
>>
>> I think we should drop the warn_invalid now that we have a tracepoint.
>> The tracepoint is much nicer for debugging vs a warning for what might
>> be a valid case depending on xdp program.
>
> I agree.  I'll do that in a follow up patch. I'll likely remove the
> bpf_warn_invalid_xdp_redirect() function completely.

+1

> We also have bpf_warn_invalid_xdp_action() but that might be relevant
> to keep around(?).

Keeping this is fine, imo.