[openib-general] smpdump and current MAD layer

[Hal Rosenstock]

On Tue, 2004-11-30 at 13:55, Sean Hefty wrote:
> This is something that was briefly discussed before.  I think that I 
> would support snooping by extending the ib_mad_reg_reg structure to 
> indicate a registration type, possibly along with some additional 
> filtering parameters.  (We could also create a new snoop routine.)

Maybe a single bit field in the registration request to indicate snoop.

Another question is what is the granularity of snoop registrations
needed to be supported ? Is one SMP snooper and one GMP snooper
sufficient ? Should the snoopers be per class ? It seems to me that
going down to the method level is too much for snoopers. This is just
another way of expressing the filtering parameters you mention.

> One issue with snooping MAD is whether the snooping occurs above or 
> below RMPP, or possibly in both places.

In general, I would think the GMP snooping would specify whether it is
to be done above or below RMPP and perhaps the class or all GS classes
(some combinations wouldn't make sense). I could see if one thought one
was having problems with RMPP handling doing it below RMPP and otherwise
above (the normal case).

-- Hal