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Re: [storm] DDP messages ordering

Elena Gurevich <elena.gurevich@toganetworks.com> Wed, 09 September 2015 13:07 UTC

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From: Elena Gurevich <elena.gurevich@toganetworks.com>
To: Tom Talpey <tom@talpey.com>, "storm@ietf.org" <storm@ietf.org>
Thread-Topic: [storm] DDP messages ordering
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Date: Wed, 09 Sep 2015 13:07:15 +0000
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Subject: Re: [storm] DDP messages ordering
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Hello,

During my testing of some iWARP adaptor I discovered that RNIC interleaves DDP segments of Send and Read Response messages.
According to your previous response this behavior is forbidden, is it ?

Best regards,
Lena

-----Original Message-----
From: storm [mailto:storm-bounces@ietf.org] On Behalf Of Tom Talpey
Sent: Tuesday, September 08, 2015 5:15 PM
To: storm@ietf.org
Subject: Re: [storm] DDP messages ordering

On 9/8/2015 6:02 AM, Elena Gurevich wrote:
> Hello,
>
> RFC 5041 section 5.3 stands that
>
> ----------------------------------
>
> 5.3 Ordering Among DDP Messages
>
> Messages passed through the DDP MUST conform to the ordering rules
>
> defined in this section.
>
> At the Data Source, DDP:
>
> * MUST transmit DDP Messages in the order they were submitted to
>
> the DDP layer,
>
> * SHOULD transmit DDP Segments within a DDP Message in increasing
>
> MO order for Untagged DDP Messages, and in increasing TO order
>
> for Tagged DDP Messages.
>
> ----------------------------------
>
> Does this mean that transmitter MUST not interleave DDM segments
> related to consequent DDP messages ?

It depends on what you mean by "the transmitter". It's certainly possible that network delivery and TCP retransmission can reorder segments. But the first rule requires that DDP not interleave two separate operations when passing them to the TCP transport.

Tom.

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