Re: Request new DLT value for raw fibre channel

[Guy Harris <guy () alum mit edu>]

On Jul 22, 2009, at 12:21 PM, Guy Harris wrote:

> On Jul 22, 2009, at 11:17 AM, kahou lei wrote:
>
> > In this case, can you assign me one more value for FC with SOF? The  
> > reason
> > is that our module can send out two type of packets: One with SOF,  
> > one
> > without SOF.
>
> So what are the contents of the 4 bytes of SOF?

In particular, is it the

5.3.  FC SOF and EOF


   As described in section 5.1, representation of FC SOF and EOF in an
   IP Network byte stream requires special formatting and 8-bit code
   definitions.  Therefore, the encapsulated FC frame SHALL have the
   format shown in Figure 5.  The redundancy of the SOF/EOF
   representation in the encapsulation format results from concerns  
that
   the information be protected from transmission errors.

   W|------------------------------Bit------------------------------|
   o|                                                               |
   r|                    1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3|
   d|0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1|
    +---------------+---------------+-------------------------------+
   0|      SOF      |      SOF      |     -SOF      |     -SOF      |
    +---------------+---------------+-------------------------------+
   1|                                                               |
    +-----                   FC frame content                  -----+
    |                                                               |
    +---------------+---------------+-------------------------------+
   n|      EOF      |      EOF      |     -EOF      |     -EOF      |
    +---------------+---------------+-------------------------------+

    Figure 5 -  FC Frame Encapsulation Format

   Note: The number of 8-bit bytes in the FC frame content is always a
   multiple of four.

   SOF: The SOF fields contain the encoded SOF value selected from  
table
   2.

   +-------+------+-------+    +-------+------+-------+
   |  FC   | SOF  |       |    |  FC   | SOF  |       |
   |  SOF  | Code | Class |    |  SOF  | Code | Class |
   +-------+------+-------+    +-------+------+-------+
   | SOFf  | 0x28 |   F   |    | SOFi4 | 0x29 |   4   |
   | SOFi2 | 0x2D |   2   |    | SOFn4 | 0x31 |   4   |
   | SOFn2 | 0x35 |   2   |    | SOFc4 | 0x39 |   4   |
   | SOFi3 | 0x2E |   3   |    +-------+------+-------+
   | SOFn3 | 0x36 |   3   |
   +-------+------+-------+

   Table 2  Translation of FC SOF values to SOF field contents

   -SOF: The -SOF fields contain the one's complement of the value in
      the SOF fields.  Encapsulation receivers SHOULD validate the SOF
      field according to a policy defined by the encapsulating  
protocol.

                ...

   Note: FC-BB-2 [6] lists SOF and EOF codes not shown in table 2 and
   table 3 (e.g., SOFi1 and SOFn1).  However, FC-MI [8] identifies  
these
   codes as not interoperable, so they are not listed in this
   specification.

representation from RFC 3643:

        http://tools.ietf.org/html/rfc3643

or is it something else?
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