[openib-general] Re: [PATCH] CMA and iWARP

[Sean Hefty]

Steve Wise wrote:
> I agree.  However, the question is how to find the associated openib
> device once you determine which netdev device you are using for the next
> hop.  In the existing IB CMA code, this is done by a linear search
> through the ib devices and finding a device that has the gid associated
> with the IPoIB netdev device.  I'm proposing we do exactly the same
> thing, except we compare mac addresses.  And we map mac addresses into
> either gids or guids.

To clarify slightly, in IB a netdev device maps to a specific port on an IB 
device.  The linear search is required in order to handle device removal between 
identifying what the mapping is and acquiring the reference on the ib_device. 
Even if the ib_device could be returned directly, the search would still be 
needed to guarantee that the CMA currently has access to the device.

- Sean