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oxm_fields: Add comments

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Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
YAMAMOTO Takashi 2015-01-16 17:20:00 +09:00 committed by FUJITA Tomonori
parent 95d3a075fb
commit 0d3ccc9457
1 changed files with 28 additions and 2 deletions
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30
ryu/ofproto/oxm_fields.py
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@ -24,6 +24,32 @@
# value and mask are on-wire bytes.
# mask is None if no mask.
# There are three type of OXM/NXM headers.
#
# 32-bit OXM/NXM header
# +-------------------------------+-------------+-+---------------+
# | class | field |m| length |
# +-------------------------------+-------------+-+---------------+
#
# 64-bit experimenter OXM header
# +-------------------------------+-------------+-+---------------+
# | class (OFPXMC_EXPERIMENTER) | field |m| length |
# +-------------------------------+-------------+-+---------------+
# | experimenter ID |
# +---------------------------------------------------------------+
#
# ONF EXT-256 style experimenter OXM header
# +-------------------------------+-------------+-+---------------+
# | class (OFPXMC_EXPERIMENTER) | ????? |m| length |
# +-------------------------------+-------------+-+---------------+
# | experimenter ID (ONF_EXPERIMENTER_ID) |
# +-------------------------------+-------------------------------+
# | exp_type |
# +-------------------------------+
#
# Note: According to blp@nicira, EXT-256 will be rectified.
# https://www.mail-archive.com/dev%40openvswitch.org/msg37644.html
import itertools
import struct
import ofproto_common
@ -252,8 +278,6 @@ def parse(mod, buf, offset):
if exp_id == ofproto_common.ONF_EXPERIMENTER_ID:
# XXX
# This block implements EXT-256 style experimenter OXM.
# However, according to blp, the extension will be rectified.
# https://www.mail-archive.com/dev%40openvswitch.org/msg37644.html
onf_exp_type_pack_str = '!H'
(exp_type, ) = struct.unpack_from(onf_exp_type_pack_str, buf,
offset + hdr_len + exp_hdr_len)
@ -281,6 +305,8 @@ def parse(mod, buf, offset):
def serialize(mod, n, value, mask, buf, offset):
exp_hdr = bytearray()
if isinstance(n, tuple):
# XXX
# This block implements EXT-256 style experimenter OXM.
(cls, exp_type) = n
desc = mod._oxm_field_desc(n)
assert issubclass(cls, _Experimenter)