implementation of IEEE 802.1Qbg in lldpad

[Jens Osterkamp <jens@linux.vnet.ibm.com>]

Hi,

this set of patches contains the initial implementation of the IEEE 802.1Qbg
standard: code for the exchange of EVB TLVs in LLDP frames to negotiate VSI
capabalities as well as VDP VSI TLVs between a host with virtual machines
and an adjacent switch.

It supports setting the parameters of the TLV exchange from the command
line using lldptool.

VDP profiles consisting of mode,mgrid,typeid,typeidversion,instanceid,mac,vlan
can be given to lldpad with lldptool or sent to lldpad via netlink messages from
the kernel or another program, e.g. libvirt.

VDP profiles are processed through the VDP/VSI and ECP state machines and
sent out in ECP frames.
ACK frames are received and processed through ECP and VDP/VSI state machines.

It implements a VDP bridge role for a port together with a lldptool command to
switch a port to the bridge role.

The patches have been rebased to lldpad 0.9.38 and still contain code to log
low-level protocol activity more verbosely than necessary.

In comparison to the last posted series, several changes have been made:

 - all EVB TLV patches have been folded into one

 - ECP and VDP implementation now only consists of 3 patches: ECP, VDP and VDP
   commandline interface

 - the protocol specific ecp structure has been moved away from the general
   port structure

 - the non-standard ECP_TX_IDLE state has been removed from the ECP TX state
   machine which causes ecp frames to be sent out immediately to allow sequence
   synchronization

 - VDP subtype has changed from 0 to 2

 - some network byte order in the VSI tlv have been fixed

 - vdp config variables are now saved in subsection "vdp" under the interface
   in lldpad.conf

 - some compiler warnings have been fixed

 - many other small bug fixes

For more information about lldpad take a look at

http://sourceforge.net/projects/e1000/files/DCB%20Tools/lldpad/

Please review and comment.

Thanks !

                        Jens