[openib-general] ib_mad.c comments

[Hal Rosenstock]

On Sun, 2004-09-12 at 13:25, Roland Dreier wrote:
>     Hal> Another specific issue will come into play for the CM in that
>     Hal> the callbacks will want to invoke ib_create/modify_qp. Will
>     Hal> those be callable from non process context ? Just want to be
>     Hal> sure...
> 
> No, ib_create_qp and ib_modify_qp are not callable from process
> context.  It's up to the CM to defer processing to a process context
> (probably using a workqueue).  This is exactly the same thing the CM
> has to do with timeouts, since Linux timers are called from timer
> interrupt context.

At some point, we may want to consider what it would take to make
ib_[create modify]_qp run from other than process context as this would
help with CM performance.

-- Hal