Wireshark-dev: Re: [Wireshark-dev] Invitation to discuss possible dissector for SCSI-OSD (was:
Hi,
Since there are many opcodes in OSD that are from SPC I think the best solution would probably be to
implement everything except opcode 0x7f in the existing dissector and implement the OSD specific bits (opcode 0x7f)
in a new packet-scsi-osd.c
Adding an initial dissector for OSD that at least includes all the opcodes that are shared from SPC would be trivial and I can do that tonight.
Do you have example captures with OSD traffic you can share?
On 9/28/06, Joe Breher <linux@xxxxxxxxxxx> wrote:
With much embarrassment, I note that I neglected to change the Subject
of my last post (quoted herein). This reply should be near my last post
in the digest, thereby hopefully eliminating some confusion.
Joe Breher wrote:
> ronnie sahlberg wrote:
>
>> Please do so. It would be very nice to add one more transport for our
>> SCSI dissector.
>>
>>
> Ronnie (et al) -
>
> It may be time for me to go public with the reason for my desire to
> become involved with wireshark development. In essence, I am in need of
> a dissector for SCSI-OSD. This is an INCITS T10 Technical Committee
> ratified Standard for a command set for Object-based Storage Devices.
> This is a full command layer as SBC, SMC, etc, that are already
> supported in the wireshark SCSI dissector.
>
> I still am not familiar enough with the wireshark SCSI dissector code to
> have opinions on the matter. Accordingly, now is probably an opportune
> time for discussion ;-).
>
> It is unclear to me at this point whether it makes more sense to extend
> the current SCSI dissector, or to develop a new one for OSD. I'd like to
> extend the current one. However, there are several unique challenges in
> OSD that do not exist in any of the command sets that the current
> dissector in packet-scsi.c currently handles. Among these are :
> - Variable Length CDBs
> - 'opcode' is x7F for all commands - the 'effective opcode' is actually
> a two-byte Service Action in bytes CDB[9..8]
> - bidirectional data transfers - Data In *and* Data Out 'phases' ('IUs',
> 'PDUs', whatever) during the execution of a *single* command.
> the list goes on.
>
> I would love to hear from anyone who either has an interest in these
> aspects of SCSI, or has insight into the design decisions behind the
> current SCSI dissector.
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>
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