From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
"David S. Miller" <davem@davemloft.net>,
Jesper Dangaard Brouer <brouer@redhat.com>,
John Fastabend <john.fastabend@gmail.com>,
Lorenz Bauer <lmb@cloudflare.com>, Andrey Ignatov <rdna@fb.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: Re: [PATCH bpf-next 1/4] xdp: Support specifying expected existing program when attaching XDP
Date: Fri, 20 Mar 2020 19:17:46 +0100 [thread overview]
Message-ID: <87imiy6gc5.fsf@toke.dk> (raw)
In-Reply-To: <20200320103530.2853c573@kicinski-fedora-PC1C0HJN>
Jakub Kicinski <kuba@kernel.org> writes:
>> > If we do please run this thru checkpatch, set .strict_start_type,
>>
>> Will do.
>>
>> > and make the expected fd unsigned. A negative expected fd makes no
>> > sense.
>>
>> A negative expected_fd corresponds to setting the UPDATE_IF_NOEXIST
>> flag. I guess you could argue that since we have that flag, setting a
>> negative expected_fd is not strictly needed. However, I thought it was
>> weird to have a "this is what I expect" API that did not support
>> expressing "I expect no program to be attached".
>
> I see it now, not entirely unreasonable.
>
> Why did you choose to use the FD rather than passing prog id directly?
> Is the application unlikely to have program ID?
For consistency with other APIs. Seems the pattern is generally that
userspace supplies program FDs, and the kernel returns IDs, no?
-Toke
next prev parent reply other threads:[~2020-03-20 18:17 UTC|newest]
Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 13:13 [PATCH bpf-next 0/4] XDP: Support atomic replacement of XDP interface attachments Toke Høiland-Jørgensen
2020-03-19 13:13 ` [PATCH bpf-next 1/4] xdp: Support specifying expected existing program when attaching XDP Toke Høiland-Jørgensen
2020-03-19 22:52 ` Jakub Kicinski
2020-03-20 8:48 ` Toke Høiland-Jørgensen
2020-03-20 17:35 ` Jakub Kicinski
2020-03-20 18:17 ` Toke Høiland-Jørgensen [this message]
2020-03-20 18:35 ` Jakub Kicinski
2020-03-20 18:30 ` John Fastabend
2020-03-20 20:24 ` Andrii Nakryiko
2020-03-23 11:24 ` Toke Høiland-Jørgensen
2020-03-23 16:54 ` Jakub Kicinski
2020-03-23 18:14 ` Andrii Nakryiko
2020-03-23 19:23 ` Toke Høiland-Jørgensen
2020-03-24 1:01 ` David Ahern
2020-03-24 4:53 ` Andrii Nakryiko
2020-03-24 20:55 ` David Ahern
2020-03-24 22:56 ` Andrii Nakryiko
2020-03-24 5:00 ` Andrii Nakryiko
2020-03-24 10:57 ` Toke Høiland-Jørgensen
2020-03-24 18:53 ` Jakub Kicinski
2020-03-24 22:30 ` Andrii Nakryiko
2020-03-25 1:25 ` Jakub Kicinski
2020-03-24 19:22 ` John Fastabend
2020-03-25 1:36 ` Alexei Starovoitov
2020-03-25 2:15 ` Jakub Kicinski
2020-03-25 18:06 ` Alexei Starovoitov
2020-03-25 18:20 ` Jakub Kicinski
2020-03-25 19:14 ` Alexei Starovoitov
2020-03-25 10:42 ` Toke Høiland-Jørgensen
2020-03-25 18:11 ` Alexei Starovoitov
2020-03-25 10:30 ` Toke Høiland-Jørgensen
2020-03-25 17:56 ` Alexei Starovoitov
2020-03-24 22:25 ` Andrii Nakryiko
2020-03-25 9:38 ` Toke Høiland-Jørgensen
2020-03-25 17:55 ` Alexei Starovoitov
2020-03-26 0:16 ` Andrii Nakryiko
2020-03-26 5:13 ` Jakub Kicinski
2020-03-26 18:09 ` Andrii Nakryiko
2020-03-26 19:40 ` Alexei Starovoitov
2020-03-26 20:05 ` Edward Cree
2020-03-27 11:09 ` Lorenz Bauer
2020-03-27 23:11 ` Alexei Starovoitov
2020-03-26 10:04 ` Lorenz Bauer
2020-03-26 17:47 ` Jakub Kicinski
2020-03-26 19:45 ` Alexei Starovoitov
2020-03-26 18:18 ` Andrii Nakryiko
2020-03-26 19:53 ` Alexei Starovoitov
2020-03-27 11:11 ` Toke Høiland-Jørgensen
2020-04-02 20:21 ` bpf: ability to attach freplace to multiple parents Alexei Starovoitov
2020-04-02 21:23 ` Toke Høiland-Jørgensen
2020-04-02 21:54 ` Alexei Starovoitov
2020-04-03 8:38 ` Toke Høiland-Jørgensen
2020-04-07 1:44 ` Alexei Starovoitov
2020-04-07 9:20 ` Toke Høiland-Jørgensen
2020-05-12 8:34 ` Toke Høiland-Jørgensen
2020-05-12 9:53 ` Alan Maguire
2020-05-12 13:02 ` Toke Høiland-Jørgensen
2020-05-12 23:18 ` Alexei Starovoitov
2020-05-12 23:06 ` Alexei Starovoitov
2020-05-13 10:25 ` Toke Høiland-Jørgensen
2020-04-02 21:24 ` Andrey Ignatov
2020-04-02 22:01 ` Alexei Starovoitov
2020-03-26 12:35 ` [PATCH bpf-next 1/4] xdp: Support specifying expected existing program when attaching XDP Toke Høiland-Jørgensen
2020-03-26 19:06 ` Andrii Nakryiko
2020-03-27 11:06 ` Lorenz Bauer
2020-03-27 16:12 ` David Ahern
2020-03-27 20:10 ` Andrii Nakryiko
2020-03-27 23:02 ` Alexei Starovoitov
2020-03-30 15:25 ` Edward Cree
2020-03-31 3:43 ` Alexei Starovoitov
2020-03-31 22:05 ` Edward Cree
2020-03-31 22:16 ` Alexei Starovoitov
2020-03-27 19:42 ` Andrii Nakryiko
2020-03-27 19:45 ` Andrii Nakryiko
2020-03-27 23:09 ` Alexei Starovoitov
2020-03-27 11:46 ` Toke Høiland-Jørgensen
2020-03-27 20:07 ` Andrii Nakryiko
2020-03-27 22:16 ` Toke Høiland-Jørgensen
2020-03-27 22:54 ` Andrii Nakryiko
2020-03-28 1:09 ` Toke Høiland-Jørgensen
2020-03-28 1:44 ` Andrii Nakryiko
2020-03-28 19:43 ` Toke Høiland-Jørgensen
2020-03-26 19:58 ` Alexei Starovoitov
2020-03-27 12:06 ` Toke Høiland-Jørgensen
2020-03-27 23:00 ` Alexei Starovoitov
2020-03-28 1:43 ` Toke Høiland-Jørgensen
2020-03-28 2:26 ` Alexei Starovoitov
2020-03-28 19:34 ` Toke Høiland-Jørgensen
2020-03-28 23:35 ` Alexei Starovoitov
2020-03-29 10:39 ` Toke Høiland-Jørgensen
2020-03-29 19:26 ` Alexei Starovoitov
2020-03-30 10:19 ` Toke Høiland-Jørgensen
2020-03-29 20:23 ` Andrii Nakryiko
2020-03-30 13:53 ` Toke Høiland-Jørgensen
2020-03-30 20:17 ` Andrii Nakryiko
2020-03-31 10:13 ` Toke Høiland-Jørgensen
2020-03-31 13:48 ` Daniel Borkmann
2020-03-31 15:00 ` Toke Høiland-Jørgensen
2020-03-31 20:19 ` Andrii Nakryiko
2020-03-31 20:15 ` Andrii Nakryiko
2020-03-30 15:41 ` Edward Cree
2020-03-30 19:13 ` Jakub Kicinski
2020-03-31 4:01 ` Alexei Starovoitov
2020-03-31 11:34 ` Toke Høiland-Jørgensen
2020-03-31 18:52 ` Alexei Starovoitov
2020-03-20 20:30 ` Daniel Borkmann
2020-03-20 20:40 ` Daniel Borkmann
2020-03-20 21:30 ` Jakub Kicinski
2020-03-20 21:55 ` Daniel Borkmann
2020-03-20 23:35 ` Jakub Kicinski
2020-03-20 20:39 ` Andrii Nakryiko
2020-03-23 11:25 ` Toke Høiland-Jørgensen
2020-03-23 18:07 ` Andrii Nakryiko
2020-03-23 23:54 ` Andrey Ignatov
2020-03-24 10:16 ` Toke Høiland-Jørgensen
2020-03-20 2:13 ` Yonghong Song
2020-03-20 8:48 ` Toke Høiland-Jørgensen
2020-03-19 13:13 ` [PATCH bpf-next 2/4] tools: Add EXPECTED_FD-related definitions in if_link.h Toke Høiland-Jørgensen
2020-03-19 13:13 ` [PATCH bpf-next 3/4] libbpf: Add function to set link XDP fd while specifying old fd Toke Høiland-Jørgensen
2020-03-19 13:13 ` [PATCH bpf-next 4/4] selftests/bpf: Add tests for attaching XDP programs Toke Høiland-Jørgensen
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=87imiy6gc5.fsf@toke.dk \
--to=toke@redhat.com \
--cc=andriin@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=brouer@redhat.com \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=john.fastabend@gmail.com \
--cc=kafai@fb.com \
--cc=kuba@kernel.org \
--cc=lmb@cloudflare.com \
--cc=netdev@vger.kernel.org \
--cc=rdna@fb.com \
--cc=songliubraving@fb.com \
--cc=yhs@fb.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.