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    Another shot at codes and please comment



    
    
    Here is a another version of the opcodes part:
    
    1.1.1.1   Opcode
    
       The Opcode indicates what type of iSCSI PDU the header encapsulates.
    
       The Opcodes are divided into two categories: initiator opcodes and
       target opcodes. Initiator opcodes are in PDUs sent by the initiators
       (request PDUs), and target opcodes are in PDUs sent by the target
       (response PDUs).
    
       Initiators MUST NOT use target opcodes and targets MUST NOT use
       initiator opcodes.
    
       Valid initiator opcodes defined in this specification are:
    
    
          0x00 NOP-Out (from initiator to target)
          0x01 SCSI Command (encapsulates a SCSI Command Descriptor Block)
          0x02 SCSI Task Management Command
          0x03 Login Command
          0x04 Text Command
          0x05 SCSI Data-out (for WRITE operations)
          0x06 Logout Command
          0x10 SNACK Request
    
       Valid target opcodes are:
    
    
          0x20 NOP-In (from target to initiator)
          0x21 SCSI Response (contains SCSI status and possibly sense
          information or other response information)
          0x22 SCSI Task Management Response
          0x23 Login Response
          0x24 Text Response
          0x25 SCSI Data-in (for READ operations)
          0x26 Logout Response
          0x31 Ready To Transfer (R2T - sent by target to initiator when it is
          ready to receive data from initiator)
          0x32 Asynchronous Message (sent by target to initiator to indicate
          certain special conditions)
          0x3f Reject
    
       Initiator opcodes 0x1c-0x1e and target opcodes 0x3c-0x3e are vendor
       specific codes.
    
    
       Please comment,
       Julo
    
    
    


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Last updated: Tue Sep 04 01:04:48 2001
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