FIBRE CHANNEL - T11

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FC-Tape Fibre Channel Tape Rev 1.07 August 7, 1998 6 FC-AL feature set This clause describes the use of Fibre Channel Arbitrated Loop features and capabilities by devices that conform to this document. Devices shall be compliant with FC-AL-2. 6.1 FC-AL features Table 15 lists Fibre Channel Arbitrated Loop features with usage defined by this document. Table 15 – FC-AL Features Feature SCSI Initiator SCSI Target Open Full Duplex - OPN(yx) Open Originator can send I I Open Recipient accepts R R Open Half Duplex - OPN(yy) Open Originator can send I I Open Recipient accepts R R Open Multicast/Selective Replicate - OPN(yr), OPN(fr) Open Originator can send P P Login_BB_Credit Advertise Login_BB_Credit >= 0 A A Accept Login_BB_Credit >= 0 R R 3 LPEyx/LPByx/LPEfx Origination P P 1 MRKtx origination P P 4 Attempt to acquire Hard Address (by devices having a Hard Address defined) during LIHA Sequence of loop initialization following a R R 5 power cycle, power-on reset, or recognition of LIP(AL_PD,AL_PS) LILP/LIRP Loop Master shall originate R R 2 Non-loop Master L_Ports accept R R 2 NOTES: Notes 1 LPEfx is useful for resetting the bypass circuits of NL_Ports that have been bypassed and have lost their AL_PAs due to an intervening LIP (and therefore cannot be enabled using an addressed LPEyx). SCSI Targets complying with SFF-8045 shall be able to recognize LPE/LPB directed to the appropriate AL_PA and toggle the corresponding port bypass enable signal. 2 The initialization Loop Master shall originate the LIRP/LILP Sequences if the Loop Initialization identifier (in the LISA Frame) is hex ‘11050100’. Any L_Port (including the Loop Master) that is not capable of supporting LIRP/LILP shall set the Loop Initialization identifier (in the LISA Frame) to hex‘11050000’ to indicate that the LIRP/LILP Sequences shall not be originated. 3 The actual value used shall be between zero and the Login_BB_Credit value received during PLOGI. 4 An NL_Port that receives a MRK shall attempt to forward the MRK per FC-AL rules. FC-AL states that an L_Port may remove a MRK if necessary for clock skew management. 5 Ports complying with SFF-8045 shall attempt to acquire the Hard Address presented by the SFF-8045 defined interface. 28
6.2 Alternate Login_BB_Credit management TR-xx-1998 Fibre Channel Tape Rev 1.07 August 7, 1998 OPN Originators may open full or half duplex, regardless of the value of Login_BB_Credit. See Annex A for examples. Interoperability with devices that advertise Login_BB_Credit=0 is required. After completing the Loop Initialization Procedure, Login_BB_Credit shall be zero with all devices until after completion of the SCSI Target Discovery protocol (see 10.3). NOTE – This is essential for two reasons: The device at a particular address that had Login_BB_Credit > 0 may have been replaced by a device with Login_BB_Credit = 0. Until SCSI Target Discovery is complete, there is no way to be sure that the port is communicating with the Login_BB_Credit > 0 device. Secondly, a device may have been trying to balance credit by not sending CLS when the LIP occurred. The LIP could have prematurely forced the device into the MONITORING state at a time when it has insufficient buffers available. Requiring SCSI Target Discovery before assuming Login BB_Credit > 0 enables the device to free its buffers before attempting to resume normal operations. 6.3 Loop Initialization features NOTE – The information in this subclause is provided for information only and is not intended as a replacement for the relevant standard. NL_Ports shall attempt to acquire their previously acquired AL_PA before they attempt to acquire their Hard Address, unless the NL_Port has experienced a power cycle, power-on reset, recognized a LIP(AL_PD,AL_PS) for that port, or any other event that causes the previously acquired AL_PA to be lost. 6.3.1 Initializing LIP(F7,F7) and LIP(F7,AL_PS) If there are no address conflicts, these LIPs shall have no effect on existing Exchanges except that the Exchange in progress may be disrupted, resulting in a ULP timeout. LIP(F7,F7) is used if the initiating NL_Port has no valid AL_PA, and LIP(F7,AL_PS) is used if it does. 6.3.2 Selective Hard Reset LIP(AL_PD,AL_PS) Upon recognition of LIP(AL_PD,AL_PS) the NL_Port designated by AL_PD shall perform the appropriate resetting actions specified in table 23. All other L_Ports shall treat this as LIP(F7,AL_PS). SCSI Targets are prohibited from issuing this LIP. 6.3.3 Loop Failure LIP(F8,AL_PS) and LIP(F8,F7) A Loop Failure is defined as detection of any of the following: a) Loss of Signal b) Loss of Synchronization for longer than R_T_TOV If a Loop Failure occurs, the L_Port which detects the failure shall issue LIP(F8,AL_PS) if it has a valid AL_PA, or LIP(F8,F7) if it doesn’t. 6.3.4 Failure to obtain an AL_PA An L_Port which loses its previously acquired address shall implicitly logout all NL_Ports regardless of whether or not that AL_PA was previously-assigned, hard-assigned, or soft-assigned. If no soft ad- 29
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FIBRE CHANNEL - T11

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