[PATCH] Re: [openib-general] Re: IPoIB Failure CQ overrun

[Michael S. Tsirkin]

Hello!
Quoting r. Roland Dreier (roland at topspin.com) "Re: [PATCH] Re: [openib-general] Re: IPoIB Failure CQ overrun":
>     Michael> But why wait for completion? Once QP is in error no new
>     Michael> WQEs will be processed by hardware. You can close the CQ
>     Michael> and free all of them.
> 
> We can't destroy the CQ before we destroy the associated QP.  And we
> don't want to destroy the associated QP (for various reasons we prefer
> using the same QP if someone ifconfigs down and then up their IPoIB
> interface).

I see.
Hmm.  But not if you a bringing the module down, right?
So if the module is going down, cant you do this then?

Maybe we just need a way to do "reset cq" which will
do harware to software and back.

> In any case if we destroyed the QP without waiting for completions we
> wouldn't know which requests completed successfully and which were flushed.
> 
>  - R.

You free them either way.
I think its only because you keep the old QP and the old CQ.

mst