[ofa-general] IBTA Management Working Group: Extending SubnMgmt attributes

[Eitan Zahavi]

Dear IB Management Developer,

This mail serves as a notice to the IB management developers community.

During its work the MgtWG has discovered some of the SubnMgmt class
attributes were defined such that
the space after the last attribute component was not explicitly
reserved.

This space is important to allow extension of existing attributes with
new optional components 
- enabling future enhancements to the specification.
Although the use of the "spare" space was ratified by IBTA committees
the MgtWG decided to 
approach the developer community before the first standardized extension
makes use of that space.

Not only the SubnMgmt attribute (e.g. SwitchInfo) will get extended, but
it's occurrences in the 
response SubnAdmin Record (e.g. SwitchInfoRecord) needs to be updated
too.

Note that the existing specification enables modification of the size of
the embedded attributes  - by defining 
the AttributeOffset component of the RMPP header. But it is the
implementation of the RMPP requestor and 
responder responsibility to coordinate the new size of the attributes.

Please send feedback to mgtwg at infinibandta.org or directly to me.

Thanks

Eitan Zahavi 
IBTA MgtWG Co-Chair

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