Add support to priority code point (PCP) that is an 3-bit field

which refers to IEEE 802.1p class of service and maps to the frame
priority level.

Values in order of priority are: 1 (Background (lowest)),
0 (Best effort (default)), 2 (Excellent effort),
3 (Critical applications), 4 (Video, < 100ms latency),
5 (Video, < 10ms latency), 6 (Internetwork control) and
7 (Network control (highest)).

Example of usage:
root# ifconfig em0.1 create
root# ifconfig em0.1 vlanpcp 3

Note:
The review D801 includes the pf(4) part, but as discussed with kristof,
we won't commit the pf(4) bits for now.
The credits of the original code is from rwatson.

Differential Revision:	https://reviews.freebsd.org/D801
Reviewed by:	gnn, adrian, loos
Discussed with: rwatson, glebius, kristof
Tested by:	many including Matthew Grooms <mgrooms__shrew.net>
Obtained from:	pfSense
Relnotes:	Yes

1 files changed, 31 insertions, 6 deletions

diff --git a/sbin/ifconfig/ifvlan.c b/sbin/ifconfig/ifvlan.c
index 107b87b..3b37160 100644
--- a/sbin/ifconfig/ifvlan.c
+++ b/sbin/ifconfig/ifvlan.c
@@ -1,6 +1,10 @@
 /*
- * Copyright (c) 1999
- *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
+ * Copyright (c) 1999 Bill Paul <wpaul@ctr.columbia.edu>
+ * Copyright (c) 2012 ADARA Networks, Inc.
+ * All rights reserved.
+  *
+ * Portions of this software were developed by Robert N. M. Watson under
+ * contract to ADARA Networks, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -78,10 +82,14 @@ vlan_status(int s)
 {
 	struct vlanreq		vreq;
 
-	if (getvlan(s, &ifr, &vreq) != -1)
-		printf("\tvlan: %d parent interface: %s\n",
-		    vreq.vlr_tag, vreq.vlr_parent[0] == '\0' ?
-		    "<none>" : vreq.vlr_parent);
+	if (getvlan(s, &ifr, &vreq) == -1)
+		return;
+	printf("\tvlan: %d", vreq.vlr_tag);
+	if (ioctl(s, SIOCGVLANPCP, (caddr_t)&ifr) != -1)
+		printf(" vlanpcp: %u", ifr.ifr_vlan_pcp);
+	printf(" parent interface: %s", vreq.vlr_parent[0] == '\0' ?
+	    "<none>" : vreq.vlr_parent);
+	printf("\n");
 }
 
 static void
@@ -149,6 +157,22 @@ DECL_CMD_FUNC(setvlandev, val, d)
 }
 
 static
+DECL_CMD_FUNC(setvlanpcp, val, d)
+{
+	u_long ul;
+	char *endp;
+
+	ul = strtoul(val, &endp, 0);
+	if (*endp != '\0')
+		errx(1, "invalid value for vlanpcp");
+	if (ul > 7)
+		errx(1, "value for vlanpcp out of range");
+	ifr.ifr_vlan_pcp = ul;
+	if (ioctl(s, SIOCSVLANPCP, (caddr_t)&ifr) == -1)
+		err(1, "SIOCSVLANPCP");
+}
+
+static
 DECL_CMD_FUNC(unsetvlandev, val, d)
 {
 	struct vlanreq		vreq;
@@ -169,6 +193,7 @@ DECL_CMD_FUNC(unsetvlandev, val, d)
 static struct cmd vlan_cmds[] = {
 	DEF_CLONE_CMD_ARG("vlan",			setvlantag),
 	DEF_CLONE_CMD_ARG("vlandev",			setvlandev),
+	DEF_CMD_ARG("vlanpcp",				setvlanpcp),
 	/* NB: non-clone cmds */
 	DEF_CMD_ARG("vlan",				setvlantag),
 	DEF_CMD_ARG("vlandev",				setvlandev),