From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH V3 1/5] RDMA/core: Transport-independent access flags Date: Thu, 23 Jul 2015 17:53:10 -0600 Message-ID: <20150723235310.GA20537@obsidianresearch.com> References: <559FC710.1050307@talpey.com> <20150710161108.GA19042@obsidianresearch.com> <55A24571.60902@dev.mellanox.co.il> <00e201d0be6a$e49bc910$add35b30$@opengridcomputing.com> <20150714194512.GA25887@infradead.org> <00f901d0be6f$70c96b00$525c4100$@opengridcomputing.com> <1828884A29C6694DAF28B7E6B8A82373A901C9A5@ORSMSX109.amr.corp.intel.com> <009e01d0c57a$37d5b9e0$a7812da0$@opengridcomputing.com> <1828884A29C6694DAF28B7E6B8A82373A901DB80@ORSMSX109.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1828884A29C6694DAF28B7E6B8A82373A901DB80-P5GAC/sN6hkd3b2yrw5b5LfspsVTdybXVpNB7YpNyf8@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "Hefty, Sean" , "Marciniszyn, Mike" Cc: Steve Wise , 'Christoph Hellwig' , 'Sagi Grimberg' , 'Steve Wise' , 'Tom Talpey' , 'Doug Ledford' , "sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org" , "ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org" , "roid-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org" , "target-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "trond.myklebust-7I+n7zu2hftEKMMhf/gKZA@public.gmane.org" , "bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org" , 'Oren Duer' List-Id: linux-rdma@vger.kernel.org On Thu, Jul 23, 2015 at 11:30:08PM +0000, Hefty, Sean wrote: > I don't see where usnic, ipath, qib, or opa technically need an lkey > at all. The lkey is possibly useful if someone wants to do single op transfers larger than the S/G limit of the SQE. I haven't noticed any ULPs doing that.. qib family may not technically need a lkey, but those drivers are the only modern drivers not to support IB_DEVICE_LOCAL_DMA_LKEY. 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