RE: [EXT] Re: [BUG] Layerscape CAAM+kTLS+io_uring

[Gaurav Jain <gaurav.jain@nxp.com>]

Hello Steffen

> -----Original Message-----
> From: Steffen Trumtrar <s.trumtrar@pengutronix.de>
> Sent: Monday, May 16, 2022 3:36 PM
> To: Jakub Kicinski <kuba@kernel.org>
> Cc: Marc Kleine-Budde <mkl@pengutronix.de>; linux-crypto@vger.kernel.org;
> io-uring@vger.kernel.org; kernel@pengutronix.de; Horia Geanta
> <horia.geanta@nxp.com>; Pankaj Gupta <pankaj.gupta@nxp.com>; Gaurav Jain
> <gaurav.jain@nxp.com>; Jens Axboe <axboe@kernel.dk>; Pavel Begunkov
> <asml.silence@gmail.com>; Boris Pismenny <borisp@nvidia.com>; John
> Fastabend <john.fastabend@gmail.com>; Daniel Borkmann
> <daniel@iogearbox.net>; netdev@vger.kernel.org
> Subject: [EXT] Re: [BUG] Layerscape CAAM+kTLS+io_uring
> 
> Caution: EXT Email
> 
> Jakub Kicinski <kuba@kernel.org> writes:
> 
> > On Thu, 5 May 2022 21:20:46 +0200 Marc Kleine-Budde wrote:
> >> Hello,
> >>
> >> no one seems to care about this problem. :/
> >>
> >> Maybe too many components are involved, I'm the respective
> >> maintainers on Cc.
> >>
> >> Cc += the CAAM maintainers
> >> Cc += the io_uring maintainers
> >> Cc += the kTLS maintainers
> >>
> >> On 27.04.2022 10:20:40, Steffen Trumtrar wrote:
> >> > Hi all,
> >> >
> >> > I have a Layerscape-1046a based board where I'm trying to use a
> >> > combination of liburing (v2.0) with splice, kTLS and CAAM (kernel
> >> > v5.17). The problem I see is that on shutdown the last bytes are
> >> > missing. It looks like io_uring is not waiting for all completions
> >> > from the CAAM driver.
> >> >
> >> > With ARM-ASM instead of the CAAM, the setup works fine.
> >>
> >> What's the difference between the CAAM and ARM-ASM crypto? Without
> >> looking into the code I think the CAAM is asynchron while ARM-ASM is
> >> synchron. Is this worth investigating?
> >
> > Sounds like
> > 20ffc7adf53a ("net/tls: missing received data after fast remote
> > close")
> 
> That fixes something in tls_sw. I have a kernel that includes this patch. So this
> sounds right, but can't be it, right?
> 
To understand more on problem, can you share how you are offloading ktls to CAAM?

Gaurav
> 
> Best regards,
> Steffen
> 
> --
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