From: Jakub Kicinski <kuba@kernel.org>
To: Dmitry Safonov <dima@arista.com>
Cc: Dmitry Safonov via B4 Relay <devnull+dima.arista.com@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Neal Cardwell <ncardwell@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
"David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
Bob Gilligan <gilligan@arista.com>,
Salam Noureddine <noureddine@arista.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v3 2/2] tcp: Free TCP-AO/TCP-MD5 info/keys without RCU
Date: Wed, 3 Sep 2025 15:23:31 -0700 [thread overview]
Message-ID: <20250903152331.2e31b3cf@kernel.org> (raw)
In-Reply-To: <CAGrbwDRHOaiBcMecGrE=bdRG6m0aHyk_VBtpN6-g-B92NF=hTA@mail.gmail.com>
On Wed, 3 Sep 2025 18:41:39 +0100 Dmitry Safonov wrote:
> > On Sat, 30 Aug 2025 05:31:47 +0100 Dmitry Safonov via B4 Relay wrote:
> > > Now that the destruction of info/keys is delayed until the socket
> > > destructor, it's safe to use kfree() without an RCU callback.
> > > As either socket was yet in TCP_CLOSE state or the socket refcounter is
> > > zero and no one can discover it anymore, it's safe to release memory
> > > straight away.
> > > Similar thing was possible for twsk already.
> >
> > After this patch the rcu members of struct tcp_ao* seem to no longer
> > be used?
>
> Right. I'll remove tcp_ao_info::rcu in v4.
> For tcp_ao_key it's needed for the regular key rotation, as well as
> for tcp_md5sig_key.
Hm, maybe I missed something. I did a test allmodconfig build yesterday
and while the md5sig_key rcu was still needed, removing the ao_key
didn't cause issues. But it was just a quick test I didn't even config
kconfig is sane.
next prev parent reply other threads:[~2025-09-03 22:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-30 4:31 [PATCH net-next v3 0/2] tcp: Destroy TCP-AO, TCP-MD5 keys in .sk_destruct() Dmitry Safonov
2025-08-30 4:31 ` Dmitry Safonov via B4 Relay
2025-08-30 4:31 ` [PATCH net-next v3 1/2] " Dmitry Safonov
2025-08-30 4:31 ` Dmitry Safonov via B4 Relay
2025-08-30 4:31 ` [PATCH net-next v3 2/2] tcp: Free TCP-AO/TCP-MD5 info/keys without RCU Dmitry Safonov
2025-08-30 4:31 ` Dmitry Safonov via B4 Relay
2025-09-02 23:08 ` Jakub Kicinski
2025-09-03 17:41 ` Dmitry Safonov
2025-09-03 22:23 ` Jakub Kicinski [this message]
2025-09-03 23:17 ` Dmitry Safonov
2025-09-03 23:27 ` Jakub Kicinski
2025-09-09 1:29 ` Dmitry Safonov
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=20250903152331.2e31b3cf@kernel.org \
--to=kuba@kernel.org \
--cc=0x7f454c46@gmail.com \
--cc=davem@davemloft.net \
--cc=devnull+dima.arista.com@kernel.org \
--cc=dima@arista.com \
--cc=dsahern@kernel.org \
--cc=edumazet@google.com \
--cc=gilligan@arista.com \
--cc=horms@kernel.org \
--cc=kuniyu@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ncardwell@google.com \
--cc=netdev@vger.kernel.org \
--cc=noureddine@arista.com \
--cc=pabeni@redhat.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.