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From: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Jason Gunthorpe
	<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>,
	"Hefty,
	Sean" <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Kaike Wan <kaike.wan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	John Fleck <john.fleck-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Thomas Graf <tgraf-G/eBtMaohhA@public.gmane.org>,
	Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Jiri Pirko <jiri-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	RDMA mailing list
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-netdev <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: Netlink messages without NLM_F_REQUEST flag
Date: Thu, 8 Jun 2017 08:08:25 +0300	[thread overview]
Message-ID: <20170608050825.GJ1127@mtr-leonro.local> (raw)
In-Reply-To: <20170607183511.GA10225-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>

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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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  parent reply	other threads:[~2017-06-08  5:08 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-07 16:19 Netlink messages without NLM_F_REQUEST flag Leon Romanovsky
     [not found] ` <20170607161901.GD1127-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-06-07 16:37   ` Jason Gunthorpe
     [not found]     ` <20170607163758.GA25313-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-06-07 16:43       ` Leon Romanovsky
     [not found]         ` <CALq1K=Jj_jJ5_OAiiws-es37tFEsLeLJeSvnU+bfwd0KLkGM3Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-06-07 16:47           ` Jason Gunthorpe
     [not found]             ` <20170607164750.GA7507-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-06-07 17:00               ` Leon Romanovsky
     [not found]                 ` <20170607170037.GG1127-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-06-07 17:07                   ` Jason Gunthorpe
     [not found]                     ` <20170607170702.GB7507-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-06-07 18:18                       ` Leon Romanovsky
     [not found]                         ` <20170607181810.GI1127-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-06-07 18:26                           ` Hefty, Sean
2017-06-07 18:35                         ` Jason Gunthorpe
     [not found]                           ` <20170607183511.GA10225-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-06-08  5:08                             ` Leon Romanovsky [this message]
2017-06-07 17:10                   ` Weiny, Ira
2017-06-07 18:13                     ` Leon Romanovsky

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