netdev - Re: [PATCH bpf-next v3 00/13] tools: bpf: extend bpftool prog load

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Date:   Wed, 11 Jul 2018 22:18:14 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        alexei.starovoitov@...il.com, Andrey Ignatov <rdna@...com>
Cc:     oss-drivers@...ronome.com, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 00/13] tools: bpf: extend bpftool prog load

On 07/10/2018 11:42 PM, Jakub Kicinski wrote:
> Hi!
> 
> This series starts with two minor clean ups to test_offload.py
> selftest script.
> 
> The next 11 patches extend the abilities of bpftool prog load
> beyond the simple cgroup use cases.  Three new parameters are
> added:
> 
>  - type - allows specifying program type, independent of how
>    code sections are named;
>  - map  - allows reusing existing maps, instead of creating a new
>    map on every program load;
>  - dev  - offload/binding to a device.
> 
> A number of changes to libbpf is required to accomplish the task.
> The section - program type logic mapping is exposed.  We should
> probably aim to use the libbpf program section naming everywhere.
> For reuse of maps we need to allow users to set FD for bpf map
> object in libbpf.
> 
> Examples
> 
> Load program my_xdp.o and pin it as /sys/fs/bpf/my_xdp, for xdp
> program type:
> 
> $ bpftool prog load my_xdp.o /sys/fs/bpf/my_xdp \
>   type xdp
> 
> As above but for offload:
> 
> $ bpftool prog load my_xdp.o /sys/fs/bpf/my_xdp \
>   type xdp \
>   dev netdevsim0
> 
> Load program my_maps.o, but for the first map reuse map id 17,
> and for the map called "other_map" reuse pinned map /sys/fs/bpf/map0:
> 
> $ bpftool prog load my_maps.o /sys/fs/bpf/prog \
>   map idx 0 id 17 \
>   map name other_map pinned /sys/fs/bpf/map0
> 
> ---
> v3:
>  - fix return codes in patch 5;
>  - rename libbpf_prog_type_by_string() -> libbpf_prog_type_by_name();
>  - fold file path into xattr in patch 8;
>  - add patch 10;
>  - use dup3() in patch 12;
>  - depend on fd value in patch 12;
>  - close old fd in patch 12.
> v2:
>  - add compat for reallocarray().

Applied to bpf-next, thanks Jakub!