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Date:   Fri, 28 Aug 2020 17:27:22 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Martin KaFai Lau <kafai@...com>, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>, kernel-team@...com,
        netdev@...r.kernel.org
Subject: Re: [PATCH v3 bpf-next 0/3] bpf: Relax the max_entries check for
 inner map

On 8/28/20 3:18 AM, Martin KaFai Lau wrote:
> v3:
> - Add map_meta_equal to bpf_map_ops and use it as an explict
>    opt-in support for map-in-map
>    
> v2:
> - New BPF_MAP_TYPE_FL to minimize code churns (Alexei)
> - s/capabilities/properties/ (Andrii)
> - Describe WHY in commit log (Andrii)
> 
> People has a use case that starts with a smaller inner map first and then
> replaces it with a larger inner map later when it is needed.
> 
> This series allows the outer map to be updated with inner map in different
> size as long as it is safe (meaning the max_entries is not used in the
> verification time during prog load).
> 
> Please see individual patch for details.
> 
> Martin KaFai Lau (3):
>    bpf: Add map_meta_equal map ops
>    bpf: Relax max_entries check for most of the inner map types
>    bpf: selftests: Add test for different inner map size
> 
>   include/linux/bpf.h                           | 16 +++++++++
>   kernel/bpf/arraymap.c                         | 16 +++++++++
>   kernel/bpf/bpf_inode_storage.c                |  1 +
>   kernel/bpf/cpumap.c                           |  1 +
>   kernel/bpf/devmap.c                           |  2 ++
>   kernel/bpf/hashtab.c                          |  4 +++
>   kernel/bpf/lpm_trie.c                         |  1 +
>   kernel/bpf/map_in_map.c                       | 24 +++++--------
>   kernel/bpf/map_in_map.h                       |  2 --
>   kernel/bpf/queue_stack_maps.c                 |  2 ++
>   kernel/bpf/reuseport_array.c                  |  1 +
>   kernel/bpf/ringbuf.c                          |  1 +
>   kernel/bpf/stackmap.c                         |  1 +
>   kernel/bpf/syscall.c                          |  1 +
>   net/core/bpf_sk_storage.c                     |  1 +
>   net/core/sock_map.c                           |  2 ++
>   net/xdp/xskmap.c                              |  8 +++++
>   .../selftests/bpf/prog_tests/btf_map_in_map.c | 35 ++++++++++++++++++-
>   .../selftests/bpf/progs/test_btf_map_in_map.c | 31 ++++++++++++++++
>   19 files changed, 132 insertions(+), 18 deletions(-)

Looks good to me, applied thanks!

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