netdev - Re: [PATCH bpf-next v2 0/3] bpf: add sk_msg helper sk_msg_pop

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Date:   Tue, 27 Nov 2018 09:24:29 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 0/3] bpf: add sk_msg helper sk_msg_pop_data

On Mon, Nov 26, 2018 at 02:16:16PM -0800, John Fastabend wrote:
> After being able to add metadata to messages with sk_msg_push_data we
> have also found it useful to be able to "pop" this metadata off before
> sending it to applications in some cases. This series adds a new helper
> sk_msg_pop_data() and the associated patches to add tests and tools/lib
> support.
> 
> Thanks!
> 
> v2: Daniel caught that we missed adding sk_msg_pop_data to the changes
>     data helper so that the verifier ensures BPF programs revalidate
>     data after using this helper. Also improve documentation adding a
>     return description and using RST syntax per Quentin's comment. And
>     delta calculations for DROP with pop'd data (albeit a strange set
>     of operations for a program to be doing) had potential to be
>     incorrect possibly confusing user space applications, so fix it.

lgtm
for the set:
Acked-by: Alexei Starovoitov <ast@...nel.org>