netdev - Re: [net PATCH] bpf: remove SK

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Date:   Wed, 1 Nov 2017 09:26:21 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     alexei.starovoitov@...il.com, daniel@...earbox.net,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [net PATCH] bpf: remove SK_REDIRECT from UAPI

Wed, Nov 01, 2017 at 03:17:31AM CET, john.fastabend@...il.com wrote:
>Now that SK_REDIRECT is no longer a valid return code. Remove it
>from the UAPI completely. Then do a namespace remapping internal
>to sockmap so SK_REDIRECT is no longer externally visible.
>
>Patchs primary change is to do a namechange from SK_REDIRECT to
>__SK_REDIRECT
>
>Reported-by: Alexei Starovoitov <ast@...nel.org>
>Signed-off-by: John Fastabend <john.fastabend@...il.com>
>---
> include/uapi/linux/bpf.h       |    1 -
> kernel/bpf/sockmap.c           |   16 ++++++++++++----
> tools/include/uapi/linux/bpf.h |    3 +--
> 3 files changed, 13 insertions(+), 7 deletions(-)
>
>diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
>index 0d7948c..7bf4c75 100644
>--- a/include/uapi/linux/bpf.h
>+++ b/include/uapi/linux/bpf.h
>@@ -788,7 +788,6 @@ struct xdp_md {
> enum sk_action {
> 	SK_DROP = 0,
> 	SK_PASS,
>-	SK_REDIRECT,

Is it really ok to do uapi changes like this?