On Wed, May 04, 2016 at 06:41:58PM +0300, Leon Romanovsky wrote: > From: Mark Bloch <markb@xxxxxxxxxxxx> > > There is an assumption that rdmacm is used only between nodes > in the same IB subnet, this why ARP resolution can be used to turn > IP to GID in rdmacm. > > When dealing with IB communication between subnets this assumption > is no longer valid. ARP resolution will get us the next hop device > address and not the peer node's device address. > > To overcome this limitation, let's check user space if it can > provide the GID of the peer node, and fail if not. > > We add a sequence number to identify each request and fill in the GID > upon answer from user space. This description doesn't describe what this patch is trying to do. This patch is delegating IP to GID translation to user space if there is a route table entry for the destination. I have to say, I really don't like this at all. If we want to have proper routing support then the translation needs to be done somehow in-band. What is user space supposed to do? Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
