netdev - Re: [PATCH net-next 3/5] ixgbe: use return codes from ndo_xdp

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Date:   Tue, 22 Aug 2017 23:21:59 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org
CC:     John Fastabend <john.fastabend@...il.com>
Subject: Re: [PATCH net-next 3/5] ixgbe: use return codes from ndo_xdp_xmit
 that are distinguishable

On 08/22/2017 10:47 PM, Jesper Dangaard Brouer wrote:
> For XDP_REDIRECT the use of return code -EINVAL is confusing, as it is
> used in three different cases.  (1) When the index or ifindex lookup
> fails, and in the ixgbe driver (2) when link is down and (3) when XDP
> have not been enabled.
>
> The return code can be picked up by the tracepoint xdp:xdp_redirect
> for diagnosing why XDP_REDIRECT isn't working.  Thus, there is a need
> different return codes to tell the issues apart.
>
> I'm considering using a specific err-code scheme for XDP_REDIRECT
> instead of using these errno codes.
>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Acked-by: Daniel Borkmann <daniel@...earbox.net>