[openib-general] [PATCHv2] IPoIB CM Experimental support

[Michael S. Tsirkin]

> > > Hi, Michael,
> > >
> > > Tried this patch, it didn't work on ehca. I couldn't change the mode from
> > > datagram to connected from /sys/class.
> >
> > It's wroking as designed in that respect.  ehca does not implement
> > srq - without
> > srq, there is no way to prepost receive buffers for a resonable number of
> > connections without running out of memory.
> >
> > So it is falling back on datagram mode.
> > Talk to ehca guys to implement srq and connected mode will be enabled.
>
> Don't remember SRQ is a MUST for UC mode. Does this patch support devices with
> SRQ in RC mode?

Yes. Only RC mode is supported by this patch.
>From what you say I am guessing that SRQ is supported by ehca HW but support
is currently lacking in the ehca driver?

> > > And when unloading ib_ipoib module, all the connections to that node gone,
> > > rmmod ib_ipoib hung. The kernel is 2.6.19.
> >
> > Probably a bug in error handling somewhere.
> > Post the sysrq t trace and I'll take a look.
> 
> I will recreate the problem and post stack trace later.
> 
> Thanks
> Shirley Ma


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MST