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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: Unsolicited Data.The current spec states that the F bit is "set to 1 when the immediate data that accompany the command are all the data associated with this command. It is an error if the Length and Expected Length do not match and this bit is set to 1". I interpret this as there is no more data to follow and not that the initiator has opted not to use the unsolicited data feature. Therefore the spec needs to be modified to indicate that if unsolicited data has been negotiated (i.e. InitialR2T=no), then the initiator MUST send unsolicited data of length = min( FirstBurstSize, ExpectedTransferLength ) minus any immediate data sent). Matthew Burbridge NIS-Bristol Hewlett Packard Telnet: 312 7010 E-mail: matthewb@bri.hp.com -----Original Message----- From: Ayman Ghanem [mailto:aghanem@cisco.com] Sent: Tuesday, June 05, 2001 6:31 PM To: ips@ece.cmu.edu Subject: RE: Unsolicited Data. If the initiator decides not to send immediate or unsolicited data when it has negotiated to do so, then the initiator must set the F-bit in the command PDU. This prompts the target to send R2T. I still agree that the spec should indicate that the initiator MUST use the resources it has negotiated. If it has negotiated the option to send immediate data or unsolicited data then it should do that to the limits allowed. If it has negotiated a PDU length, it must not send data PDUs less than the negotiated limit except for last one. While most implementation may do that for performance reasons, I would prefer defining this in the spec. -Ayman > -----Original Message----- > From: owner-ips@ece.cmu.edu [mailto:owner-ips@ece.cmu.edu]On Behalf Of > BURBRIDGE,MATTHEW (HP-UnitedKingdom,ex2) > Sent: Tuesday, June 05, 2001 11:58 AM > To: 'ips@ece.cmu.edu' > Subject: Unsolicited Data. > > > I'm not sure if this has been discussed before but it is causing some > confusion. The statement below implies that if immediate data has been > negotiated then the initiator MAY use it. > > "If ImmediateData is set to no and InitialR2T is set to no then the > initiator MUST NOT send unsolicited immediate data but MAY send one > unsolicited burst of Data-OUT PDUs." > > Therefore the target must wait for the initial burst of unsolicited data > before issuing the first R2T (if there is subsequent data). If the > initiator decides not to send it then the target must timeout and > issue the > R2T for the initial data. Can the spec be changed to state that if > unsolicited data has been negotiated, then the initiator MUST use it. > > Thanks > > Matthew Burbridge > NIS-Bristol > Hewlett Packard > Telnet: 312 7010 > E-mail: matthewb@bri.hp.com > >
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