Add error checking and support for DCB Exchange protocol (DCBX) version 1.01.

From Kaladhar Musunuru <kaladharm@sourceforge.net>:

Added support for DCB Exchange protocol (DCBX) version 1.01.
http://www.ieee802.org/1/files/public/docs2008/az-wadekar-dcbx-capability-exchange-discovery-protocol-1108-v1.01.pdf

DCBX protocol exchanges control state machine and generic feature state
machine parameters as Organizationally specific TLVs.  The OUI used for
the DCBX TLV 1.01 is 0x001B21.  Following TLVs are decoded:

- Control state
- Priority Groups (PG)
- Priority-based Flow Control (PFC)
- Application Protocol (APP)

From me:

Add a bunch of additional error checking, and sort the main switch
statement by TLV code (and thus by the order in the specification).
Also update/add indications of what standards document what items.

Author: guyharris

CREDITS

@@ -96,6 +96,7 @@ Additional people who have contributed patches:
     Julian Cowley                 <julian at lava dot net>
     Juliusz Chroboczek            <jch@pps.jussieu.fr>
     Kaarthik Sivakumar            <kaarthik at torrentnet dot com>
+    Kaladhar Musunuru             <kaladharm at sourceforge dot net>
     Karl Norby                    <karl-norby at sourceforge dot net>
     Kazushi Sugyo                 <sugyo at pb dot jp dot nec dot com>
     Kelly Carmichael              <kcarmich at ipapp dot com>

oui.c

@@ -42,6 +42,7 @@ const struct tok oui_values[] = {
     { OUI_IEEE_8021_PRIVATE, "IEEE 802.1 Private"},
     { OUI_IEEE_8023_PRIVATE, "IEEE 802.3 Private"},
     { OUI_TIA, "ANSI/TIA"},
+    { OUI_DCBX, "DCBX"},
     { 0, NULL }
 };
 

oui.h

@@ -30,6 +30,7 @@ extern const struct tok smi_values[];
 #define OUI_IEEE_8021_PRIVATE 0x0080c2      /* IEEE 802.1 Organisation Specific - Annex F */
 #define OUI_IEEE_8023_PRIVATE 0x00120f      /* IEEE 802.3 Organisation Specific - Annex G */
 #define OUI_TIA         0x0012bb        /* TIA - Telecommunications Industry Association - ANSI/TIA-1057- 2006 */
+#define OUI_DCBX        0x001B21        /* DCBX */
 
 /*
  * These are SMI Network Management Private Enterprise Codes for