netdev - Re: [PATCH bpf-next v11 0/7] bpf: add BPF_LWT_ENCAP_IP option to bpf_lwt_push

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Date:   Wed, 13 Feb 2019 18:39:18 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Peter Oskolkov <posk@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        Peter Oskolkov <posk@...k.io>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH bpf-next v11 0/7] bpf: add BPF_LWT_ENCAP_IP option to
 bpf_lwt_push_encap

On Wed, Feb 13, 2019 at 05:46:26PM -0700, David Ahern wrote:
> On 2/13/19 12:53 PM, Peter Oskolkov wrote:
> > This patchset implements BPF_LWT_ENCAP_IP mode in bpf_lwt_push_encap
> > BPF helper. It enables BPF programs (specifically, BPF_PROG_TYPE_LWT_IN
> > and BPF_PROG_TYPE_LWT_XMIT prog types) to add IP encapsulation headers
> > to packets (e.g. IP/GRE, GUE, IPIP).
> > 
> > This is useful when thousands of different short-lived flows should be
> > encapped, each with different and dynamically determined destination.
> > Although lwtunnels can be used in some of these scenarios, the ability
> > to dynamically generate encap headers adds more flexibility, e.g.
> > when routing depends on the state of the host (reflected in global bpf
> > maps).
> > 
> 
> 
> For the set:
> Reviewed-by: David Ahern <dsahern@...il.com>

Applied. Thanks everyone!