linux-kernel - Re: [PATCH 31/33] sctp: add sctp_sock_set

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Date:   Thu, 21 May 2020 11:08:12 +0200
From:   'Christoph Hellwig' <hch@....de>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Christoph Hellwig' <hch@....de>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        David Miller <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
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        "kuznet@....inr.ac.ru" <kuznet@....inr.ac.ru>,
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        "vyasevich@...il.com" <vyasevich@...il.com>,
        "nhorman@...driver.com" <nhorman@...driver.com>,
        "jmaloy@...hat.com" <jmaloy@...hat.com>,
        "ying.xue@...driver.com" <ying.xue@...driver.com>,
        "drbd-dev@...ts.linbit.com" <drbd-dev@...ts.linbit.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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        "rds-devel@....oracle.com" <rds-devel@....oracle.com>,
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Subject: Re: [PATCH 31/33] sctp: add sctp_sock_set_nodelay

On Thu, May 21, 2020 at 09:06:19AM +0000, David Laight wrote:
> > > The comment still applies, though. (re the duplication)
> > 
> > Where do you see duplication?
> 
> The whole thing just doesn't scale.
> 
> As soon as you get to the slightly more complex requests
> like SCTP_INITMSG (which should probably be called to
> set the required number of data streams) you've either
> got replicated code or nested wrappers.

None of that is relevant to setting the nodelay option.  If you actually
read through the series you'd say that whenever there was non-trivial
logic it is shared with getopt.  However sharing just for purpose of
sharing doesn't make sense, so where the kernel API ended up just
setting a flag after taking the sock lock I did not opt for it.