From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH 0/7] IB/hfi1: Remove write() and use ioctl() for user access Date: Thu, 14 Apr 2016 12:05:40 -0600 Message-ID: <20160414180540.GA12554@obsidianresearch.com> References: <20160414153727.6387.96381.stgit@scvm10.sc.intel.com> <20160414164550.GC6247@obsidianresearch.com> <20160414174830.GA11641@rhel.sc.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20160414174830.GA11641-no5AT4YuGWKtqXYlAKuG4QC/G2K4zDHf@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Ira Weiny Cc: Dennis Dalessandro , dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org 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 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html