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[71.204.185.212]) by smtp.gmail.com with ESMTPSA id o32sm3204394pje.9.2019.06.28.20.46.06 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 28 Jun 2019 20:46:07 -0700 (PDT) Date: Fri, 28 Jun 2019 20:46:03 -0700 From: Jakub Kicinski To: John Fastabend Cc: daniel@iogearbox.net, ast@kernel.org, netdev@vger.kernel.org, edumazet@google.com, bpf@vger.kernel.org Subject: Re: [PATCH 1/2] tls: remove close callback sock unlock/lock and flush_sync Message-ID: <20190628204603.1191167b@cakuba.netronome.com> In-Reply-To: <20190628175925.79a763f5@cakuba.netronome.com> References: <156165697019.32598.7171757081688035707.stgit@john-XPS-13-9370> <156165700197.32598.17496423044615153967.stgit@john-XPS-13-9370> <20190627164402.31cbd466@cakuba.netronome.com> <5d1620374694e_26962b1f6a4fa5c4f2@john-XPS-13-9370.notmuch> <20190628113100.597bfbe6@cakuba.netronome.com> <5d166d2deacfe_10452ad82c16e5c0a5@john-XPS-13-9370.notmuch> <20190628154841.32b96fb1@cakuba.netronome.com> <5d16aec74b6cd_35a32adaec47c5c457@john-XPS-13-9370.notmuch> <20190628175925.79a763f5@cakuba.netronome.com> Organization: Netronome Systems, Ltd. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Fri, 28 Jun 2019 17:59:25 -0700, Jakub Kicinski wrote: > > > Sorry for all the questions, I'm not really able to fully wrap my head > > > around this. I also feel like I'm missing the sockmap piece that may > > > be why you prefer unhash over disconnect. =20 > >=20 > > Yep, if we try to support listening sockets we need a some more > > core infrastructure to push around ulp and user_data portions of > > sockets. Its not going to be nice for stable. Also at least in TLS > > and sockmap case its not really needed for any use case I know > > of. =20 >=20 > IIUC we can't go from ESTABLISHED to LISTEN without calling close()=20 > or disconnect() so I'm not clear on why are we hooking into unhash() =F0= =9F=98=95 Ah, disconnect() is also called with the socket already locked. So no BH, but still not great..