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[storm] Send vs. Immediate

Elena Gurevich <elena.gurevich@toganetworks.com> Sun, 06 September 2015 09:59 UTC

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From: Elena Gurevich <elena.gurevich@toganetworks.com>
To: "storm@ietf.org" <storm@ietf.org>
Thread-Topic: Send vs. Immediate
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Date: Sun, 06 Sep 2015 09:58:42 +0000
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Subject: [storm] Send vs. Immediate
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Hello dear authors,

I am new in iWARP and need your help to clear my  misunderstanding of RFCs.
RFC5041 Section 5.4 stands 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."

Let's assume that data sink receives sequence of "rdma_write" and send" messages.

According to RFC even if miss ordering happens "send" can be delivered to RDMAP only after last segment of rdma_write arrives and is placed.
So RDMAP layer completes "send" only after full rdma_write assembly.
If so why we need to generate new "Immediate request type" and cannot reuse 8 bytes length "send" ?


Best regards,
Elena Gurevich
---------------------------------------------------------
Software Architector at Toga Networks Ltd.

Email: Elena.Gurevich@toganetwors.com
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