netdev - Re: Netlink messages without NLM_F

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Message-ID: <20170608050825.GJ1127@mtr-leonro.local>
Date:   Thu, 8 Jun 2017 08:08:25 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        "Hefty, Sean" <sean.hefty@...el.com>
Cc:     Kaike Wan <kaike.wan@...el.com>, John Fleck <john.fleck@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, Thomas Graf <tgraf@...g.ch>,
        Doug Ledford <dledford@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        RDMA mailing list <linux-rdma@...r.kernel.org>,
        linux-netdev <netdev@...r.kernel.org>
Subject: Re: Netlink messages without NLM_F_REQUEST flag

On Wed, Jun 07, 2017 at 12:35:11PM -0600, Jason Gunthorpe wrote:
> On Wed, Jun 07, 2017 at 09:18:10PM +0300, Leon Romanovsky wrote:
>
> > > AFAIK, that is different, that is acking and retriggering a single shot
> > > notification, not completing a kernel initiated handshake.
> >
> > It is acking that message from user was received by kernel and now
> > processing.
>
> But isn't what is cared about here - the SA thing needs to send a
> request to user space and collect a reply, it runs the protocol
> backwards from normal.

Thanks all, this explain a little bit "RDMA anomaly".
I'm not sure that I saw such scheme in the kernel, does anybody else
in the kernel use such backward scheme or this is RDMA-specific?

Thanks

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