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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: iSCSI: Negotiating a parameter more than onceThe section you reference is titled "Login Phase" - SendTarget's isn't valid during the login phase, and it's not a negotiation. It's a request/declaration, and its only valid during FFP. Sorry, I don't see a problem with the text you quoted. Marjorie > -----Original Message----- > From: THALER,PAT (A-Roseville,ex1) [mailto:pat_thaler@agilent.com] > Sent: Monday, June 17, 2002 4:05 PM > To: Julian_Satran@il.ibm.com > Cc: ips@ece.cmu.edu > Subject: RE: iSCSI: Negotiating a parameter more than once > > > Julian, > > It also isn't clear whether SendTargets can be sent more than > once during a negotiation sequence. > > It would be reasonable for the Initiator to set the F bit > when it sends SendTargets and then when the Target sets the F > bit the initiator will know that the response is complete. > However if SendTargets isn't covered by the limitation on > negotiating a parameter only once per negotiation sequence, > an initiator could also leave the F bit at zero, assume the > response is done when it gets a response with an empty text > field, and send SendTargets again later in the same > negotiation sequence. An initiatior could even send a single > PDU with something like: SendTargets=<iSCSI-target-name-A>; > SendTargets=<iSCSI-target-name-B>; SendTargets=<iSCSI-target-name-C>. > > There doesn't seem to be anything in Appendix D to say which > of these is intended. The first possibility - allowing > SendTargets to be sent only once during a negotiation > sequence - seems adequate and simpler. > > Pat > > -----Original Message----- > From: pat_thaler@agilent.com [mailto:pat_thaler@agilent.com] > Sent: Monday, June 17, 2002 3:19 PM > To: Julian_Satran@il.ibm.com > Cc: ips@ece.cmu.edu > Subject: iSCSI: Negotiating a parameter more than once > > > Julian, > > The following text appears in 4.3 (page 78 just before 4.3.1): > > Neither the initiator nor the target should attempt to negotiate a > parameter more than once during login. If detected by the target this > MUST result in a Login reject (initiator error). The initiator MUST > drop the connection. > > and nearly the same text in 4.4 (page 85 near the end): > > Neither the initiator nor the target should attempt to negotiate a > parameter more than once during any negotiation sequence without an > intervening reset. If detected by the target this MUST result in a > Reject with a reason of "protocol error". The initiator MUST reset > the negotiation as outlined above. > > This is confusing partly because "negotiate" seems to be > generally used covering both negotiations and declarations > and in some cases covering only negotiations. It isn't clear > in which sense it is used. If the text above applies only to > negotiated values, then it would be allowable to send > parameters such as Initiator Name, SessionType, and > MaxRecvDataSegmentLength over which doesn't seem to be a good > idea. However, there are other declarative parameters which > are sent multiple times - SendTargets where there are > multiple targets or multiple addresses for a target requires > sending the same parameter multiple times. > > Perhaps the text should be changed to: > > Neither the initiator nor the target should attempt to > declare or negotiate a > parameter other than TargetName, TargetAlias or TargetAddress > more than once.... > > Regards, > Pat >
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