[openib-general] CM private data

[Rimmer, Todd]

All three of these have mechanisms whereby the message can be skipped, in which case applications should not depend on the private data (IB spec mentions that apps should not depend on them).

For example, A inbound receive while in RTR state after having sent a REP can be treated as an RTU, in which case later arrival of the RTU is to be discarded by the CM.

Todd Rimmer

> -----Original Message-----
> From: Tillier, Fabian 
> Sent: Wednesday, May 18, 2005 3:28 PM
> To: 'Sean Hefty'; openib-general
> Subject: RE: [openib-general] CM private data
> 
> 
> > From: Sean Hefty [mailto:mshefty at ichips.intel.com]
> > Sent: Wednesday, May 18, 2005 12:23 PM
> > 
> > Do any applications make use of the private data in these 
> CM message: RTU,
> > MRA, or DREP?  I'm doubtful of the RTU or DREP, but not as 
> sure of the
> MRA.
> > 
> > Since no replies are generated in response to these 
> messages, the CM does
> > not keep them after their sends complete.  However, it may 
> need to resend
> > the messages.  For example, it will resend the RTU if a 
> duplicate REP is
> > received.
> > 
> > If no applications are using the private data, I will not 
> worry about
> > storing the private data for the retransmissions at this time.
> 
> If you're not going to store them, I would suggest removing 
> the private data
> for the associated calls (RTU, MRA, DREP).  That way it 
> becomes very clear
> to applications wishing to use the private data that they can't.
> 
> - Fab
> 
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