[ofw] RE: Release IBA resources in DISPATCH_LEVEL ?

[Fab Tillier]

> From: Tzachi Dar [mailto:tzachid at mellanox.co.il]
> Sent: Thursday, June 12, 2008 2:22 PM
>
> If the user has to wait until the task is completed then we are in a big
> trouble in any case.
>
> Releasing this resources means going to the command interface and this
> means waiting for the HW in DPC level. This breaks the entire module,
> and I hope that this is not how things are.

There is no waiting required - the HW will generate an interrupt, which will queue the HCA driver's DPC, which will invoke a callback.  The only reason waiting is needed is because the driver implementation forces it.

So fixing the driver stack properly would require a new HCA driver design, and appropriate changes to modules higher in the stack.  That's a lot of work.

-Fab