netdev - Re: sendfile from 9p fs into af

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Message-ID: <20161123061628.GN1555@ZenIV.linux.org.uk>
Date:   Wed, 23 Nov 2016 06:16:28 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: sendfile from 9p fs into af_alg

On Tue, Nov 22, 2016 at 08:55:59PM -0800, Alexei Starovoitov wrote:
> On Wed, Nov 23, 2016 at 04:46:26AM +0000, Al Viro wrote:
> > On Tue, Nov 22, 2016 at 07:58:29PM -0800, Alexei Starovoitov wrote:
> > > Hi Al,
> > > 
> > > it seems the following commit 523ac9afc73a ("switch default_file_splice_read() to use of pipe-backed iov_iter")
> > > breaks sendfile from 9p fs into af_alg socket.
> > > sendfile into af_alg is used by iproute2/tc.
> > > I'm not sure whether it's 9p or crypto or vfs problem, but happy to test any patches.
> > 
> > Could you try -rc6 (or anything that contains 680bb946a1ae04, for that
> > matter)?
> 
> already tested with that patch in the latest net-next. Still broken :(

Joy...  Which transport are you using there?  The interesting part is
whether it's zerocopy or non-zerocopy path in p9_client_read()...