RE: ips : Is FirstBurstSize valid when InitialR2T=yes ?

["Fischer, Michael" <Michael_Fischer@adaptec.com>]

What if the sequence is as follows:

I->T	FirstBurstSize=512; T=0; NSG=CSG;
T->I	FirstBurstSize=512; T=0; NSG=CSG;
I->T	InitialR2T=no, ImmediateData=no; T=1; NSG=FULL

If the target does not support InitialR2T=no..  Does login now fail?  There
does not seem to be a way for the target to say that it requires R2T.  Why
did the Initiator send FirstBurstSize if it was setting InitialR2T to no?
There is no negotiation with an AND function.   

Michael Fischer

-----Original Message-----
From: Eddy Quicksall [mailto:Eddy_Quicksall@ivivity.com]
Sent: Wednesday, February 06, 2002 9:47 AM
To: Santosh Rao; IPS Reflector
Subject: RE: ips : Is FirstBurstSize valid when InitialR2T=yes ?


That is how I am interpreting it.

BTW: How about this one ...

I->T FirstBurstSize=512, InitialR2T=no, ImmediateData=no

If the target does not support InitialR2T=no, how should it respond to
FirstBurstSize?

Should the target do this (for draft >= 9)?

T->I FirstBurstSize=irrelevant, InitialR2T=yes, ImmediateData=no


Eddy

-----Original Message-----
From: Santosh Rao [mailto:santoshr@cup.hp.com]
Sent: Tuesday, February 05, 2002 2:56 PM
To: IPS Reflector
Subject: ips : Is FirstBurstSize valid when InitialR2T=yes ?

Hello,

Can someone clarify if the login key FirstBurstSize is valid when :
InitialR2T=yes  and ImmediateData=yes ?

i.e. if immediate data is enabled and un-solicited data is disabled
during login negotiation, is the value of FirstBurstSize received in the
login response to be interpreted ?

My current understanding is that FirstBurstSize is inclusive of the
immediate data portion, and so, if immediate data is enabled, but
un-solicited data is disabled, then, FirstBurstSize *must* be valid and
must be <= DataPDULength. (after rev 09, it would be <=
(MaxRecvPDULength - the header components size)).

For example, a target implementation may offer a FirstBurstSize <
DataPDULength, in which case, the immediate data size is the
MIN(DataPDULength, FirstBurstSize, bytes_to_send).

Can someone clarify if this is a correct interpretation or set me right
on this ?

Thanks,
Santosh


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Santosh Rao
Software Design Engineer,
HP-UX iSCSI Driver Team,
Hewlett Packard, Cupertino.
email : santoshr@cup.hp.com
Phone : 408-447-3751
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