[ofa-general] IB/core: Enhance SMI for switch support

[Roland Dreier]

 > The risk is primarily on the switch side, rather than the CA/router
 > side, right ? So isn't the downside of this minimal ?

Actually I was thinking that this disturbs the current SMI code and
potentially introduces bugs (even with plain old CAs).  And without
any switch driver it's not clear if we want to take that risk.

But OK, I'll queue this up for 2.6.23 and hope for the best...