(no subject)

I would like to know if there is agreement on the following:

Given a Marker supporting Data Source that sends:

++++++++++++++++++++++++++++
| TCP SEG #1               |
++++++++++++++++++++++++++++
Contains FPDU A (write STag 1, loc 100 with 100 A's)

++++++++++++++++++++++++++++
| TCP SEG #2               |
++++++++++++++++++++++++++++
Contains FPDU B (write STag 1, loc 200 with 100 B's)

++++++++++++++++++++++++++++
| TCP SEG #3               |
++++++++++++++++++++++++++++
Contains FPDU C (write STag 1, loc 300 with 100 C's), and FPDU D (Read
STag 1, 100 bytes from loc 300)

A marker falls in FPDU D.

During transmission TCP SEG #2 is lost, such that TCP SEG #3 arrives out
of order at the Data Sink. The iWARP receiver recovers FPDU sync by
using the marker in FPDU D. TCP SEG #2 then arrives.

Is it the case that for a "conformant" Data Sink the contents in the
RDMA READ RESPONSE SHALL be "C"s?

This is interesting in that there is no gap in the TCP sequence space as
delivered by TCP to MPA, but there is a gap in terms of what MPA has
"processed".

Since clause 5.4 states that:

At the Data Sink, DDP MUST Deliver a DDP Message if and only if all 
   of the following are true: 

     * the last DDP Segment of the DDP Message had its Last flag set,  

     * all of the DDP Segments of the DDP Message have been Placed, 

     * all preceding DDP Messages have been Placed, and 

     * each preceding DDP Message has been Delivered to the ULP.

I assume that we can expect "C"s in the READ RESPONSE.

This is scheduled to become a conformance test, so I would like to
ensure there is agreement.
 



Barry Reinhold
Lamprey Networks
[email protected]
(603) 868-8411