kern/125003: incorrect EtherIP header format.

[Hiroki Sato]

Shunsuke SHINOMIYA <shino at fornext.org> wrote
  in <200806270610.m5R6A3hR060682 at freefall.freebsd.org>:

sh>  =46rom RFC3378
sh>  > In summary, the EtherIP Header has two fields:
sh>  >=20
sh>  >       Bits 0-3:  Protocol version
sh>  >       Bits 4-15: Reserved for future use
sh>  >=20
sh>  >         0   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15
sh>  >      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
sh>  >      |               |                                               |
sh>  >      |    VERSION    |                   RESERVED                    |
sh>  >      |               |                                               |
sh>  >      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
sh>  >=20
sh>  >                  Figure 2: EtherIP Header Format (in bits)
sh>  >=20
sh>
sh>  , first octet(bit 0,MSB to 7) consists of VERSION and a part of RESERVED.
sh>  And VERSION is high 4 bits of the octet.
sh>  Am I misunderstanding this?

 The VERSION is in bit 0-3 and LSB in this diagram is left.  As Andrew
 also explained, these are the reasons why ETHERIP_VER_VERS_MASK is
 defined as 0x0f.

 Do you really have interoperability problem?  If so, please let us
 know more detail information about it first.

--
| Hiroki SATO
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