netdev - Re: [PATCH v2 net-next 0/5] Add bpf support to set sk_bound_dev

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Date:   Mon, 31 Oct 2016 18:46:56 +0100
From:   Thomas Graf <tgraf@...g.ch>
To:     David Ahern <dsa@...ulusnetworks.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        daniel@...que.org, ast@...com, daniel@...earbox.net,
        maheshb@...gle.com
Subject: Re: [PATCH v2 net-next 0/5] Add bpf support to set sk_bound_dev_if

On 10/31/16 at 11:16am, David Ahern wrote:
> On 10/31/16 11:01 AM, David Miller wrote:
> > Also, any reason why you don't allow the cgroup bpf sk filter to return
> > an error code so that the sock creation could be cancelled if the eBPF
> > program desires that?  It could be useful, I suppose.
> 
> My first draft at this feature had that but I removed it for simplicity now. Can certainly add it back.

We're trying to standardize on common return codes for all program
types. The lwt bpf series defines BPF_ codes which are compatible
with TC_ACT_* values to make lwt_bpf and cls_bpf compatible. Would
be great to use the same return codes and implement the ones that
make sense.