From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: RDMA/CM and multiple QPs Date: Tue, 8 Sep 2015 08:07:42 -0700 Message-ID: <55EEF9BE.2010002@sandisk.com> References: <20150906064550.GA30683@infradead.org> <20150906075024.GA7845@infradead.org> <55EC5879.202@sandisk.com> <55EEE936.3060702@talpey.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55EEE936.3060702-CLs1Zie5N5HQT0dZR+AlfA@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tom Talpey , Christoph Hellwig , Parav Pandit Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-rdma@vger.kernel.org On 09/08/2015 06:57 AM, Tom Talpey wrote: > On 9/6/2015 11:15 AM, Bart Van Assche wrote: >> On 09/06/15 00:50, Christoph Hellwig wrote: >>> Note that the SRP driver already in tree is a good example for this, >>> although it doesn't use RDMA/CM and thus already operates on a >>> per-ib_device level. >> >> The challenges with regard to adding RDMA/CM support to the SRP >> initiator and target drivers are: >> - IANA has not yet assigned a port number to the SRP protocol (see e.g. >> >> http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml). > > IANA doesn't do this automatically. Has anyone made the request? > > You might want to think through why it needs a dedicated port number > though. iSER reuses the iSCSI port, by negotiating RDMA during login. iSER is an iSCSI transport and that is why iSER reuses the iSCSI port number. SRP is a SCSI transport protocol by itself and that is why a new port number is needed for the SRP protocol. >> - The login request (struct srp_login_req) is too large for the RDMA/CM. >> A format for the login parameters for the RDMA/CM has not yet been >> standardized. > > Are you suggesting that RDMA/CM perform the login? That seems > like a layering issue. Sorry but I don't see why this would be a layering issue. Bart. -- 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