From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Subject: Re: Netlink messages without NLM_F_REQUEST flag
Date: Wed, 7 Jun 2017 10:37:58 -0600
Message-ID: <20170607163758.GA25313@obsidianresearch.com>
References: <20170607161901.GD1127@mtr-leonro.local>
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To: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@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>
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On Wed, Jun 07, 2017 at 07:19:01PM +0300, Leon Romanovsky wrote:
> It makes me wonder if it is expected behavior for
> ibnl_rcv_reply_skb() to handle !NLM_F_REQUEST messages and do we
> really need it? What are the scenarios?  In my use case, which is
> for sure different from yours, I'm always setting NLM_F_REQUEST
> while communicating with kernel.

If I recall the user space SA code issues REQUESTS from the kernel to
userspace, so userspace returns with the response format. This is
abnormal for netlink hence the special function.

Jason
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