> -----Original Message----- > From: Jason Gunthorpe [mailto:[email protected]] > Sent: Monday, June 09, 2014 11:51 AM > To: Or Gerlitz > Cc: Tatyana Nikolova; Steve Wise; Roland Dreier; Lacombe, John S; Sean Hefty; > linux-rdma > Subject: Re: [PATCH 0/3] RDMA/core: iWARP Port Mapper Overview > > On Sun, Jun 08, 2014 at 10:34:30PM +0300, Or Gerlitz wrote: > > What it does is the following: > > > > 1. kernel rdma driver tells a user space daemon they want to reserve > > (claim) the combination of IP address X and TCP port Y for the sake of > > RDMA connections > > > > 2. user space daemon opens a socket and binds to X:Y > > > > Specifically, down the road, more use cases, not only the current > > iWARP case may pop up. > > This really seems horrible, using user space to circumvent the kernel > stack because kernel maintainers don't want this kind of integration > is not going to make people very happy. > > IIRC the patch set that tried to do this directly in the kernel was > NAK'd, adding a userspace round trip doesn't really change anything. >
The patch set you refer to tried to _unify_ the port space and was rejected. The only other alternative is to pick ephemeral ports and maintain a mapping for RDMA services. > The message from netdev has, IMHO, always been pretty clear - offload > can live in it's own little side world but cannot appear to the user > to be integrated to the main stack (because it isn't). That is what this design does... Steve. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
