linux-kernel - Re: [PATCH 0/7] IB/hfi1: Remove write() and use ioctl() for user access

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Message-ID: <20160414180540.GA12554@obsidianresearch.com>
Date:	Thu, 14 Apr 2016 12:05:40 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Ira Weiny <ira.weiny@...el.com>
Cc:	Dennis Dalessandro <dennis.dalessandro@...el.com>,
	dledford@...hat.com, linux-rdma@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, torvalds@...ux-foundation.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] IB/hfi1: Remove write() and use ioctl() for user
 access

On Thu, Apr 14, 2016 at 01:48:31PM -0400, Ira Weiny wrote:
> On Thu, Apr 14, 2016 at 10:45:50AM -0600, Jason Gunthorpe wrote:
> > On Thu, Apr 14, 2016 at 08:41:35AM -0700, Dennis Dalessandro wrote:
> > > This patch series removes the write() interface for user access in favor of an
> > > ioctl() based approach. This is in response to the complaint that we had
> > > different handlers for write() and writev() doing different things and expecting
> > > different types of data. See:
> > 
> > I think we should wait on applying these patches until we globally sort out
> > what to do with the rdma uapi.
> > 
> > It just doesn't make alot of sense for drivers to have their own personal
> > char devices. :(
> 
> I'm afraid I have to disagree at this time.  Someday we may have "1 char device
> to rule them all" but right now we don't have any line of sight to that
> solution.  It may be _years_ before we can agree to the semantics which will
> work for all high speed, kernel bypass, rdma, low latency, network devices.

There are some pretty obvious paths to make this saner that could only
be a few weeks away, we haven't even had the first conversations
yet. I think you are completely wrong there is no 'line of sight'

It certainly can't be years.

There is some rational for a very driver specific thing, but EEPROM
and snoop? Seriously?

Jason