On Tue, 2005-06-21 at 01:14, Libor Michalek wrote: > On Mon, Jun 20, 2005 at 08:40:47PM -0700, Roland Dreier wrote: > > Kevin> Maybe somebody could help me understand the proper way to > > Kevin> map between an IP address assigned to a port to the "device > > Kevin> name" and "port number" in the gen2 architecture. If I > > Kevin> have an IP address can I map it to a name that i get back > > Kevin> from ibv_get_device_name() or pass to ibv_open_device(). > > > > It _is_ valid to ask, for a given remote IP address, which network > > interface will be used to reach it based on the local host's routing > > configuration. > > > > In the IB world, we can hope that the network interface chosen by the > > route table is an IPoIB device. From the IPoIB device, we can work > > backwards to get a local IB port. For example the network device's > > hardware address contains the associated port GID, and by searching > > the GID tables of all the known IB devices, we can find which port has > > that GID. > > > > There was some discussion a while ago about an "IB address > > translation" service proposed by the Voltaire crew, which would > > encapsulate some of this. However, we didn't make much progress > > towards a good API design, and the discussion fizzled out. > > Also, if you want to look at an example of how this is done using the > IPoIB network device and Linux routing code you can look here: > > src/linux-kernel/infiniband/ulp/sdp/sdp_link.[ch] > > The SDP code needed this functionality, so I put together a fairly simple > version that's private to SDP, as MST pointed out locking is still missing > from the code.
There is similar code in gen2/branches/shaharf-ibat/src/linux-kernel/infiniband/core/at.c > Eventually this type of code should become a central > service, since there's a number of modules that would want this info. This is exactly what IBAT is intended to be. -- Hal _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
