From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: sdf@google.com
Cc: YiFei Zhu <zhuyifei@google.com>, Yonghong Song <yhs@fb.com>,
YiFei Zhu <zhuyifei1999@gmail.com>,
bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Mahesh Bandewar <maheshb@google.com>
Subject: Re: [PATCH bpf-next 4/5] bpftool: support dumping metadata
Date: Fri, 28 Aug 2020 22:55:19 +0200 [thread overview]
Message-ID: <877dtia3t4.fsf@toke.dk> (raw)
In-Reply-To: <20200828170010.GB48607@google.com>
sdf@google.com writes:
> On 08/23, Toke H�iland-J�rgensen wrote:
>> YiFei Zhu <zhuyifei@google.com> writes:
>
>> > On Fri, Aug 21, 2020 at 3:58 AM Toke H�iland-J�rgensen
>> <toke@redhat.com> wrote:
>> >> Yonghong Song <yhs@fb.com> writes:
>> >> > Not sure whether we need formal libbpf API to access metadata or not.
>> >> > This may help other applications too. But we can delay until it is
>> >> > necessary.
>> >>
>> >> Yeah, please put in a libbpf accessor as well; I would like to use this
>> >> from libxdp - without a skeleton :)
>> >>
>> >> -Toke
>> >
>> > I don't think I have an idea on a good API in libbpf that could be
>> > used to get the metadata of an existing program in kernel, that could
>> > be reused by bpftool without duplicating all the code. Maybe we can
>> > discuss this in a follow up series?
>
>> I think the most important part is getting a reference to the metadata
>> map. So a function that basically does what the top half of what your
>> show_prog_metadata() function does: given a prog fd, walk the map ids,
>> check if any of them looks like a metadata map, and if so return the map
>> fd.
>
>> Should be pretty straight-forward to reuse between bpftool/libbpf, no?
> Sounds good, I'll be taking over this patch series as YiFei's internship
> has ended. I'll try to address that.
Great, thanks! :)
-Toke
next prev parent reply other threads:[~2020-08-28 20:55 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-20 9:42 [PATCH bpf-next 0/5] Allow storage of flexible metadata information for eBPF programs YiFei Zhu
2020-08-20 9:42 ` [PATCH bpf-next 1/5] bpf: Mutex protect used_maps array and count YiFei Zhu
2020-08-20 21:18 ` Yonghong Song
2020-08-20 9:42 ` [PATCH bpf-next 2/5] bpf: Add BPF_PROG_BIND_MAP syscall YiFei Zhu
2020-08-20 21:23 ` Yonghong Song
2020-08-20 9:42 ` [PATCH bpf-next 3/5] libbpf: Add BPF_PROG_BIND_MAP syscall and use it on .metadata section YiFei Zhu
2020-08-20 20:38 ` Yonghong Song
2020-08-21 7:52 ` YiFei Zhu
2020-08-21 15:14 ` Yonghong Song
2020-08-25 20:45 ` Andrey Ignatov
2020-08-26 4:02 ` Andrii Nakryiko
2020-08-20 9:42 ` [PATCH bpf-next 4/5] bpftool: support dumping metadata YiFei Zhu
2020-08-20 21:11 ` Yonghong Song
2020-08-21 8:58 ` Toke Høiland-Jørgensen
2020-08-21 20:10 ` YiFei Zhu
2020-08-23 18:36 ` Toke Høiland-Jørgensen
2020-08-28 17:00 ` sdf
2020-08-28 20:55 ` Toke Høiland-Jørgensen [this message]
2020-08-26 5:36 ` Andrii Nakryiko
2020-08-28 16:59 ` sdf
2020-09-03 5:18 ` Andrii Nakryiko
2020-08-20 9:42 ` [PATCH bpf-next 5/5] selftests/bpf: Test bpftool loading and " YiFei Zhu
2020-08-20 21:15 ` Yonghong Song
2020-08-26 4:00 ` Andrii Nakryiko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=877dtia3t4.fsf@toke.dk \
--to=toke@redhat.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=maheshb@google.com \
--cc=sdf@google.com \
--cc=yhs@fb.com \
--cc=zhuyifei1999@gmail.com \
--cc=zhuyifei@google.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).