netdev - Re: [PATCH bpf-next 0/3] bpf: add bpffs pretty print for hash/lru

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Date:   Sat, 11 Aug 2018 01:32:52 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Yonghong Song <yhs@...com>, ast@...com, netdev@...r.kernel.org
Cc:     kernel-team@...com
Subject: Re: [PATCH bpf-next 0/3] bpf: add bpffs pretty print for
 hash/lru_hash maps

On 08/09/2018 05:55 PM, Yonghong Song wrote:
> Commit a26ca7c982cb ("bpf: btf: Add pretty print support to
> the basic arraymap") added pretty print support to array map.
> This patch adds pretty print for hash and lru_hash maps.
> 
> The following example shows the pretty-print result of a pinned hashmap.
> Without this patch set, user will get an error instead.
> 
>     struct map_value {
>             int count_a;
>             int count_b;
>     };
> 
>     cat /sys/fs/bpf/pinned_hash_map:
> 
>     87907: {87907,87908}
>     57354: {37354,57355}
>     76625: {76625,76626}
>     ...
> 
> Patch #1 fixed a bug in bpffs map_seq_next() function so that
> all elements in the hash table will be traversed.
> Patch #2 implemented map_seq_show_elem() and map_check_btf()
> callback functions for hash and lru hash maps.
> Patch #3 enhanced tools/testing/selftests/bpf/test_btf.c to
> test bpffs hash and lru hash map pretty print.
> 
> Yonghong Song (3):
>   bpf: fix bpffs non-array map seq_show issue
>   bpf: btf: add pretty print for hash/lru_hash maps
>   tools/bpf: add bpffs pretty print btf test for hash/lru_hash maps
> 
>  kernel/bpf/hashtab.c                   | 44 +++++++++++++++++
>  kernel/bpf/inode.c                     |  8 ++--
>  tools/testing/selftests/bpf/test_btf.c | 87 ++++++++++++++++++++++++++++------
>  3 files changed, 121 insertions(+), 18 deletions(-)

Applied to bpf-next, thanks Yonghong!