netdev - Re: [bpf-next PATCH v2 2/3] bpf: sockmap, add hash map support

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Date:   Fri, 27 Apr 2018 17:09:16 -0700
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: [bpf-next PATCH v2 2/3] bpf: sockmap, add hash map support

On Fri, Apr 27, 2018 at 04:24:38PM -0700, John Fastabend wrote:
> Sockmap is currently backed by an array and enforces keys to be
> four bytes. This works well for many use cases and was originally
> modeled after devmap which also uses four bytes keys. However,
> this has become limiting in larger use cases where a hash would
> be more appropriate. For example users may want to use the 5-tuple
> of the socket as the lookup key.
> 
> To support this add hash support.
> 
> Signed-off-by: John Fastabend <john.fastabend@...il.com>
> ---
>  include/linux/bpf.h            |    8 +
>  include/linux/bpf_types.h      |    1 
>  include/uapi/linux/bpf.h       |    6 
>  kernel/bpf/core.c              |    1 
>  kernel/bpf/sockmap.c           |  494 +++++++++++++++++++++++++++++++++++++++-
>  kernel/bpf/verifier.c          |   14 +
>  net/core/filter.c              |   58 +++++
>  tools/bpf/bpftool/map.c        |    1 
>  tools/include/uapi/linux/bpf.h |    6 
>  9 files changed, 570 insertions(+), 19 deletions(-)

please split tools/* update into separate commit.

Also add man-page style documentation for new helpers to uapi/bpf.h