[ewg] RE: [ofa-general] RE: OFED 1.2 beta blocking bugs

[Hal Rosenstock]

On Thu, 2007-03-08 at 17:19, Scott Weitzenkamp (sweitzen) wrote:
> Yes, it's limited to IPoIB CM.
> 
> I'm talking about IP multicast not IB multicast, so the hardware MTU
> should be transparent.

Doesn't IPoIB CM only support IP unicast ? IP multicast should fall back
to using normal IPoIB (UD) rather than CM (RC).

-- Hal

> I'll reopen bug 418, who shall I assign it to?
> 
> Scott 
> 
> > -----Original Message-----
> > From: Sean Hefty [mailto:sean.hefty at intel.com] 
> > Sent: Thursday, March 08, 2007 2:10 PM
> > To: Scott Weitzenkamp (sweitzen); Sean Hefty; Michael S. Tsirkin
> > Cc: Pavel Shamis; Openfabrics-ewg at openib.org; 
> > general at lists.openfabrics.org; Vladimir Sokolovsky
> > Subject: RE: [ofa-general] RE: OFED 1.2 beta blocking bugs
> > 
> > >There are also IPoIB CM IP multicast problems, see bug 418.
> > 
> > Bug 418 looks different than bug 400.
> > 
> > From the bug report, it sounds like this error is limited to 
> > IPoIB CM mode.  Is
> > this correct?
> > 
> > >If you try to multicast packets > 2KB, you see:
> > 
> > I'm not sure if your hardware supports a max MTU of 2K, but 
> > in general I thought
> > multicast would work up to 4K.  Can you verify that the 
> > device MTU is higher
> > than the packet size?
> > 
> > >ib0: failed send event (status=1, wrid=35 vend_err 69)
> > 
> > It looks like this indicates a local length error on the send.
> > 
> > >ib_mthca 0000:08:00.0: modify QP 3->3 returned status 10.
> > >ib0: failed to modify QP, ret = -22
> > >ib0: couldn't attach QP to multicast group
> > 
> > This looks like a RTS -> RTS QP transition to set the QKey.  
> > I'm not sure what
> > the ib_mthca status code of 10 is, but that may give us a 
> > hint at the problem.
> > This error and the attach QP to multicast group error may be related.
> > 
> > - Sean
> > 
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