Reg: Bidirectional command format ?
Praveen Madhavan <[email protected]>
| Newsgroups | gmane.ietf.ips |
|---|---|
| Message-ID | <[email protected]> |
Hi Folks,
Can any one point me the frame format of bidirectional command in case of iSCSI & FCP ?.. I was trying to route bidirectional command recv'd from iSCSI initiator to FC Target..
Here is the iSCSI PDU format for bi-direct command recv from initiator
------------------------------------------------------------------------------------------------
| BHS(48bytes) |
| R & W bit set to ONE, |
| Expected xfer len = 0x200 |
| Total AHS Length = 2(8bytes) |
| SCSI CDB = Write(10) Transfer length = 00 01 ( 512 bytes) |
------------------------------------------------------------------------------------------------|
| AHS ( 8 bytes) |
| Expected Read data length = 0x200(512 bytes) |
--------------------------------------------------------------------------------------------------
Here is the FCP format for bi-direct command that i frame for sending it to target.
------------------------------------------------------------------------------------------------
| FC-Header (24bytes) |
|------------------------------------------------------------------------------------------------
| FCP-Header(36 bytes) |
| R & W bit set to ONE, |
| Additional CDB length = 0 |
| SCSI CDB = Write(10) Transfer length = 00 01 ( 512 bytes) |
| FCP_DL = 0x200 ( 512 bytes) |
| FCP_BIDIRECTIONAL_READ_DL = 0x200(512) |
-------------------------------------------------------------------------------------------------|
Well, I am not quite sure about the CDB values in case Bidir commands..
Will Bi directional cmds use Write CDB(10) or Read CDB (10) ? ..
How can i control following bidi- operation in case of iSCSI & FCP ?
1.bidirectional command with read before write operation
2.bidirectional command with write before read operation
-Praveen
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