netdev - Re: [PATCH bpf-next 0/9] Introduce BPF_MAP_TYPE_REUSEPORT_SOCKARRAY and BPF_PROG_TYPE_SK

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Message-ID: <4a3a7e2a-24c3-6da4-61de-d904da0c7957@iogearbox.net>
Date:   Sat, 11 Aug 2018 02:32:53 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Martin KaFai Lau <kafai@...com>, netdev@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...com>, kernel-team@...com
Subject: Re: [PATCH bpf-next 0/9] Introduce BPF_MAP_TYPE_REUSEPORT_SOCKARRAY
 and BPF_PROG_TYPE_SK_REUSEPORT

On 08/08/2018 09:59 AM, Martin KaFai Lau wrote:
> This series introduces a new map type "BPF_MAP_TYPE_REUSEPORT_SOCKARRAY"
> and a new prog type BPF_PROG_TYPE_SK_REUSEPORT.
> 
> Here is a snippet from a commit message:
> 
> "To unleash the full potential of a bpf prog, it is essential for the
> userspace to be capable of directly setting up a bpf map which can then
> be consumed by the bpf prog to make decision.  In this case, decide which
> SO_REUSEPORT sk to serve the incoming request.
> 
> By adding BPF_MAP_TYPE_REUSEPORT_SOCKARRAY, the userspace has total control
> and visibility on where a SO_REUSEPORT sk should be located in a bpf map.
> The later patch will introduce BPF_PROG_TYPE_SK_REUSEPORT such that
> the bpf prog can directly select a sk from the bpf map.  That will
> raise the programmability of the bpf prog attached to a reuseport
> group (a group of sk serving the same IP:PORT).
> 
> For example, in UDP, the bpf prog can peek into the payload (e.g.
> through the "data" pointer introduced in the later patch) to learn
> the application level's connection information and then decide which sk
> to pick from a bpf map.  The userspace can tightly couple the sk's location
> in a bpf map with the application logic in generating the UDP payload's
> connection information.  This connection info contact/API stays within the
> userspace.
> 
> Also, when used with map-in-map, the userspace can switch the
> old-server-process's inner map to a new-server-process's inner map
> in one call "bpf_map_update_elem(outer_map, &index, &new_reuseport_array)".
> The bpf prog will then direct incoming requests to the new process instead
> of the old process.  The old process can finish draining the pending
> requests (e.g. by "accept()") before closing the old-fds.  [Note that
> deleting a fd from a bpf map does not necessary mean the fd is closed]"
> 
> Please see individual patch for details
> 
> Martin KaFai Lau (9):
>   tcp: Avoid TCP syncookie rejected by SO_REUSEPORT socket
>   net: Add ID (if needed) to sock_reuseport and expose reuseport_lock
>   bpf: Introduce BPF_MAP_TYPE_REUSEPORT_SOCKARRAY
>   bpf: Introduce BPF_PROG_TYPE_SK_REUSEPORT
>   bpf: Enable BPF_PROG_TYPE_SK_REUSEPORT bpf prog in reuseport selection
>   bpf: Refactor ARRAY_SIZE macro to bpf_util.h
>   bpf: Sync bpf.h uapi to tools/
>   bpf: test BPF_MAP_TYPE_REUSEPORT_SOCKARRAY
>   bpf: Test BPF_PROG_TYPE_SK_REUSEPORT

Applied to bpf-next, thanks Martin!