On Thu, 2015-06-04 at 16:17 +0000, Hefty, Sean wrote: > > No, if they followed (I didn't check yes) the extension scheme then the > > poll call is > > > > struct ibv_wc_ex wcs[num_wcs] > > ibv_poll_wc_ex(&wcs,num_wcs,sizeof(wcs[0])); > > > > And the drivers decide what to do based on the 3rd argument, which is > > essentially the ABI version. > > As a couple of options: > > You could add a 'completion format' field to the cq attribute structure, > which would allow poll to cast to a specific structure.
This is probably what I would consider an ideal way to handle things.
> If we wanted to go with Doug's earlier idea, you could add a 'provider
> context' field to the wc. This would allow calling back into the provider to
> retrieve more data. Though, this concept would be racy if other completions
> can overwrite whatever data was trying to be retrieved.
--
Doug Ledford <dledf...@redhat.com>
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