From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: m@lambda.lt, joe@wand.net.nz, bpf@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next 3/7] bpf: add netns cookie and enable it for bpf cgroup hooks
Date: Fri, 27 Mar 2020 18:48:44 -0700 [thread overview]
Message-ID: <20200328014844.xz5s67j2cyvnf7lp@ast-mbp> (raw)
In-Reply-To: <c47d2346982693a9cf9da0e12690453aded4c788.1585323121.git.daniel@iogearbox.net>
On Fri, Mar 27, 2020 at 04:58:52PM +0100, Daniel Borkmann wrote:
> + *
> + * u64 bpf_get_netns_cookie(void *ctx)
> + * Description
> + * Retrieve the cookie (generated by the kernel) of the network
> + * namespace the input *ctx* is associated with. The network
> + * namespace cookie remains stable for its lifetime and provides
> + * a global identifier that can be assumed unique. If *ctx* is
> + * NULL, then the helper returns the cookie for the initial
> + * network namespace. The cookie itself is very similar to that
> + * of bpf_get_socket_cookie() helper, but for network namespaces
> + * instead of sockets.
All new helpers in this patch and few others are missing 'flags' argument.
Yes. It's kinda hard right now to come up with a use case for the flags,
since all helpers look kinda trivial, simple, and single purpose.
But the same thing happened with bpf_send_signal(). It felt that there is no
way to extend it. Yet later we had to add bpf_send_signal_thread() which could
have been handled with flags if they were there. So please add flags to all new
helpers though it might seem redundant.
next prev parent reply other threads:[~2020-03-28 1:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-27 15:58 [PATCH bpf-next 0/7] Various improvements to cgroup helpers Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 1/7] bpf: enable retrieval of socket cookie for bind/post-bind hook Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 2/7] bpf: enable perf event rb output for bpf cgroup progs Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 3/7] bpf: add netns cookie and enable it for bpf cgroup hooks Daniel Borkmann
2020-03-28 0:32 ` Andrii Nakryiko
2020-03-28 1:30 ` Daniel Borkmann
2020-03-28 1:48 ` Alexei Starovoitov [this message]
2020-03-28 2:16 ` Daniel Borkmann
2020-03-28 2:56 ` Alexei Starovoitov
2020-03-27 15:58 ` [PATCH bpf-next 4/7] bpf: allow to retrieve cgroup v1 classid from v2 hooks Daniel Borkmann
2020-03-28 0:41 ` Andrii Nakryiko
2020-03-28 1:56 ` Daniel Borkmann
2020-03-28 20:27 ` Andrii Nakryiko
2020-03-27 15:58 ` [PATCH bpf-next 5/7] bpf: enable bpf cgroup hooks to retrieve cgroup v2 and ancestor id Daniel Borkmann
2020-03-28 0:43 ` Andrii Nakryiko
2020-03-27 15:58 ` [PATCH bpf-next 6/7] bpf: enable retrival of pid/tgid/comm from bpf cgroup hooks Daniel Borkmann
2020-03-28 0:49 ` Andrii Nakryiko
2020-03-28 1:40 ` Daniel Borkmann
2020-03-27 15:58 ` [PATCH bpf-next 7/7] bpf: add selftest cases for ctx_or_null argument type Daniel Borkmann
2020-03-28 0:51 ` 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=20200328014844.xz5s67j2cyvnf7lp@ast-mbp \
--to=alexei.starovoitov@gmail.com \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=joe@wand.net.nz \
--cc=m@lambda.lt \
--cc=netdev@vger.kernel.org \
/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