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nicira-ext.h: Update comments

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Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Acked-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
YAMAMOTO Takashi
2014-10-14 12:29:45 +09:00
parent 919026381d
commit 16c35c1d92
1 changed files with 9 additions and 4 deletions
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13
include/openflow/nicira-ext.h
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@@ -287,6 +287,9 @@ OFP_ASSERT(sizeof(struct nx_async_config) == 24);
* short, that is also supported by Open vSwitch. This section also defines a
* replacement for each OpenFlow message that includes struct ofp10_match.
*
* OpenFlow 1.2+ introduced OpenFlow Extensible Match (OXM), adapting
* the design of NXM. The format of NXM and OXM are compatible.
*
*
* Format
* ======
@@ -307,10 +310,12 @@ OFP_ASSERT(sizeof(struct nx_async_config) == 24);
* +----------------------------------+---------------+--+------------------+
*
* The most-significant 23 bits of the header are collectively "nxm_type".
* Bits 16...31 are "nxm_vendor", one of the NXM_VENDOR_* values below. Bits
* 9...15 are "nxm_field", which is a vendor-specific value. nxm_type normally
* designates a protocol header, such as the Ethernet type, but it can also
* refer to packet metadata, such as the switch port on which a packet arrived.
* Bits 16...31 are "nxm_vendor", one of OFPXMC12_* values. In case of
* NXM, it's either OFPXMC12_NXM_0 or OFPXMC12_NXM_1.
* Bits 9...15 are "nxm_field", which is a vendor-specific value. nxm_type
* normally designates a protocol header, such as the Ethernet type, but it
* can also refer to packet metadata, such as the switch port on which a packet
* arrived.
*
* Bit 8 is "nxm_hasmask" (labeled "hm" above for space reasons). The meaning
* of this bit is explained later.