From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Wise Subject: Re: Problem running rping over Intel adapters Date: Thu, 04 Oct 2012 09:27:30 -0500 Message-ID: <506D9CD2.20606@opengridcomputing.com> References: <506CB0E9.90201@redhat.com> <1828884A29C6694DAF28B7E6B8A8237346A98E58@FMSMSX151.amr.corp.intel.com> <506CB4D8.4010604@redhat.com> <1828884A29C6694DAF28B7E6B8A8237346A98E8E@FMSMSX151.amr.corp.intel.com> <506CEAC1.9070808@opengridcomputing.com> <506D2174.10601@mellanox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <506D2174.10601-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Or Gerlitz Cc: "Hefty, Sean" , Doug Ledford , "Marciniszyn, Mike" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-rdma@vger.kernel.org On 10/4/2012 12:41 AM, Or Gerlitz wrote: > On 04/10/2012 03:47, Steve Wise wrote: >> >> Not used by iwarp drivers... > > Which one, the retry counter or the RNR retry counter? > rnr_retry_count has no meaning in iWARP. There is no RNR message in the iwarp protocol. For some iwarp devices (cxgb3 for example), an ingress send with no recv buffer available results in immediate connection termination. Some devices, (eg cxgb4), the ingress SEND is buffered in the adapter until a recv buf is posted. Both behaviors are allowed in the iwarp specs. retry_count, I assume, is for connection establishment? For the Chelsio devices, this is all up to the TCP stack and thus this counter is not used. If there is no TCP listener, then the connection establishment will fail immediately. If the node is not reachable, then normal TCP retransmit rules apply, but once TCP gives up, then the rdma connection establishment will fail. Also, the RDMA_CM and IW_CM don't even pass these two counters down to the drivers' connect function. See struct iw_cm_conn_param and cma.c/cma_connect_iw() iwcm.c/iw_cm_connect(). Steve. > Or. > > -- > 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 -- 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