[Stgt-devel] [Ips] [ofa-general] Re: Calculating the VA iniSER header
Thu May 1 16:18:45 CEST 2008
On Thu, May 1, 2008 at 11:24 AM, Ken Sandars <kensandars at hotmail.com> wrote:
> >> [Ken] It appears the current Linux iSER initiator does not send the HELLO
> message when
> >> the connection transits to full feature phase. The stgt target also
> ignores this
> >> message (if it were to appear).
> [Ken] The IBTA document does not mention the HELLO/HELLOREPLY messages.
> Implementing this message exchange gives a distinction between the current
> and those that will correctly calculate the write_va (as per Pete Wyckoff's
> option 3).
> >> [Ken] Both of these implementations use a non-conformant iSER header
> (they add
> >> write_va and read_va fields, which incidentally do not appear to be
> used). Are
> >> these changes documented anywhere in the IB domain, or are these
> >> needed for another reason?
> > [Erez] Take a look at the iSER for IB annex:
> > http://www.infinibandta.org/members/spec/Annex_iSER.PDF
> [Ken] Ouch. That link requires a username/password. Looks like it is only
> available to members
> of the Infiniband Trade Association. Fortunately I gained access to it with
> username "open" and
> password "standard". ;-)
> [Ken] Neither of these implementations send or examine the iSER CM REQ/REP
> message private data.
> The document doesn't define what action to take when this message is
> absent. Interestingly,
> when the target reports that "ZBVA shall be used for this connection" and
> "the target shall issue
> Send with Invalidate as needed" then it appears the iSER header specified in
> RFC5046 should be
> used for control-type PDUs. Is there any plan to conform with the list of
> requirements for IBTA
At the moment these capabilities (ZBVA, Send Invalidate) are not
supported in the driver,
though they seem to be supported by the ConnectX HCA.
Hence, iSER implementation do not send/examine them.
This may be added to the CM REQ/REP with the current defaults but in
order to use these capabilities a code
should be added to the HCA driver and iser.
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