From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Wise Subject: Re: nfsrdma broken on 2.6.34-rc1? Date: Mon, 29 Mar 2010 14:51:46 -0500 Message-ID: <4BB104D2.9080309@opengridcomputing.com> References: <4BB0E670.3010507@opengridcomputing.com> <20100329193715.GA28070@obsidianresearch.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100329193715.GA28070-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Gunthorpe Cc: Roland Dreier , Sean Hefty , linux-rdma , Tom Tucker List-Id: linux-rdma@vger.kernel.org Jason Gunthorpe wrote: > On Mon, Mar 29, 2010 at 12:01:07PM -0700, Roland Dreier wrote: > >> > > The rdma_cm might be able to support this if the port space were separated based >> > > on the address family, depending on how PS IB ends up. >> > >> > I think separate port spaces is the correct solution. >> >> This gets a bit tricky -- for normal IP stuff, there's the "bindv6only" >> sysctl (and the IPV6_V6ONLY socket option). Without that, you can't >> bind an IPv4 socket to the same port as an IPv6 socket, since the IPv6 >> socket will accept IPv4 connections via an v4->v6 mapped address. (You >> can look at inet_csk_bind_conflict() to see the full complexity of the >> checking done when binding an IPv4 socket) >> > > Yeah, exactly, it is very complex and there is a real need for > things pretending to be IP to capture all this subtlety. The details > can't just be skipped over, people will notice :( > > Though, I'm also not entirely certain that NFS-RDMA is right to bind > to both AFs, generally speaking on Linux for a multi-protocol app you > only want to bind to v6 addresses.. Or is it using IPV6_V6ONLY or alike? > > This issue is really not in the NFS-RDMA code. the nfsd code is doing the binding. See commit: 37498292aa97658a5d0a9bb84699ce8c1016bb74 Author: Chuck Lever Date: Tue Jan 26 14:04:22 2010 -0500 NFSD: Create PF_INET6 listener in write_ports -- 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