[openib-general] ib_mthca "NOP command failed to generate interrupt (IRQ 169), aborting."

[Roland Dreier]

 > >  - Try passing the option "fw_cmd_doorbell=0" when loading ib_mthca.
 > >    Again, it shouldn't matter but maybe it does.
 > 
 > I tried passing the option first, since it was the simplest and quickest
 > thing to try.  It worked.   The module now loads successfully.

Hmm, that's interesting.  I wonder why that caused problems with the
NOP command interrupt test.

Michael, the situation here is that Arbel with FW 4.6.0 (I know it's
old) fails with the latest mthca because the NOP test doesn't generate
an event.  However, disabling fw_cmd_doorbell makes it work again.
Do you know if this is a FW issue?

Don, it would be nice if you could try a newer firmware to see if that
works without the fw_cmd_doorbell option.

 - R.