[openib-general] CM private data

[Or Gerlitz]

Caitlin> I believe that an IT-API it_ep_accept() supplies private data
that it expects to be delivered to its peer when the three-way handshake
option is selected. 

Both IT-API it_ep_accept() and DAT dat_cr_accept() cause the provider at
the passive side to send a --REP--, 
so how --RTU-- is related to the _accept calls? 

I think you ment to say that exposing two-way handshake means that the
consumer can not supply private data for 
the RTU as he is not aware of it (the RTU) being sent?

Or.

-----Original Message-----
From: openib-general-bounces at openib.org
[mailto:openib-general-bounces at openib.org] On Behalf Of Caitlin Bestler
Sent: Thursday, May 19, 2005 2:16 AM
To: Sean Hefty
Cc: openib-general
Subject: Re: [openib-general] CM private data

I believe that an IT-API it_ep_accept() supplies private data that it
expects to be delivered to its peer when the three-way handshake option
is selected.

DAT only exposes a two-way handshake, so there it never requires private
data on the RTU.

I don't know if any IT-API applications actually require the three-way
handshake.


On 5/18/05, Sean Hefty <mshefty at ichips.intel.com> wrote:
> 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.
> 
> - Sean
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