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

sbin/ifconfig/ifconfig.8

@@ -2614,6 +2614,29 @@ Note that
 and
 .Cm vlandev
 must both be set at the same time.
+.It Cm vlanpcp Ar priority_code_point
+Priority code point 
+.Pq Dv PCP
+is an 3-bit field which refers to the IEEE 802.1p
+class of service and maps to the frame priority level.
+.Pp
+Values in order of priority are:
+.Cm 1 
+.Pq Dv Background (lowest) ,
+.Cm 0
+.Pq Dv Best effort (default) ,
+.Cm 2
+.Pq Dv Excellent effort ,
+.Cm 3
+.Pq Dv Critical applications ,
+.Cm 4
+.Pq Dv Video, < 100ms latency ,
+.Cm 5
+.Pq Dv Video, < 10ms latency ,
+.Cm 6
+.Pq Dv Internetwork control ,
+.Cm 7
+.Pq Dv Network control (highest) .
 .It Cm vlandev Ar iface
 Associate the physical interface
 .Ar iface

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
@@ -148,6 +156,22 @@ DECL_CMD_FUNC(setvlandev, val, d)
 		vlan_set(s, &ifr);
 }
 
+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)
 {
@@ -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),

share/man/man4/vlan.4

@@ -203,5 +203,3 @@ can be corrected manually if used in conjunction with such a parent interface.
 .Sh SEE ALSO
 .Xr ifconfig 8 ,
 .Xr sysctl 8
-.Sh BUGS
-No 802.1Q features except VLAN tagging are implemented.

sys/net/if.h

@@ -393,6 +393,7 @@ struct	ifreq {
 		caddr_t	ifru_data;
 		int	ifru_cap[2];
 		u_int	ifru_fib;
+		u_char	ifru_vlan_pcp;
 	} ifr_ifru;
 #define	ifr_addr	ifr_ifru.ifru_addr	/* address */
 #define	ifr_dstaddr	ifr_ifru.ifru_dstaddr	/* other end of p-to-p link */
@@ -410,6 +411,7 @@ struct	ifreq {
 #define	ifr_curcap	ifr_ifru.ifru_cap[1]	/* current capabilities */
 #define	ifr_index	ifr_ifru.ifru_index	/* interface index */
 #define	ifr_fib		ifr_ifru.ifru_fib	/* interface fib */
+#define	ifr_vlan_pcp	ifr_ifru.ifru_vlan_pcp	/* VLAN priority */
 };
 
 #define	_SIZEOF_ADDR_IFREQ(ifr) \

sys/net/if_vlan.c

@@ -1,5 +1,9 @@
 /*-
  * Copyright 1998 Massachusetts Institute of Technology
+ * Copyright 2012 ADARA Networks, Inc.
+ *
+ * Portions of this software were developed by Robert N. M. Watson under
+ * contract to ADARA Networks, Inc.
  *
  * Permission to use, copy, modify, and distribute this software and
  * its documentation for any purpose and without fee is hereby
@@ -29,8 +33,7 @@
 
 /*
  * if_vlan.c - pseudo-device driver for IEEE 802.1Q virtual LANs.
- * Might be extended some day to also handle IEEE 802.1p priority
- * tagging.  This is sort of sneaky in the implementation, since
+ * This is sort of sneaky in the implementation, since
  * we need to pretend to be enough of an Ethernet implementation
  * to make arp work.  The way we do this is by telling everyone
  * that we are an Ethernet, and then catch the packets that
@@ -52,6 +55,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mbuf.h>
 #include <sys/module.h>
 #include <sys/rmlock.h>
+#include <sys/priv.h>
 #include <sys/queue.h>
 #include <sys/socket.h>
 #include <sys/sockio.h>
@@ -114,6 +118,8 @@ struct	ifvlan {
 		int	ifvm_mintu;	/* min transmission unit */
 		uint16_t ifvm_proto;	/* encapsulation ethertype */
 		uint16_t ifvm_tag;	/* tag to apply on packets leaving if */
+              	uint16_t ifvm_vid;	/* VLAN ID */
+		uint8_t	ifvm_pcp;	/* Priority Code Point (PCP). */
 	}	ifv_mib;
 	SLIST_HEAD(, vlan_mc_entry) vlan_mc_listhead;
 #ifndef VLAN_ARRAY
@@ -121,7 +127,9 @@ struct	ifvlan {
 #endif
 };
 #define	ifv_proto	ifv_mib.ifvm_proto
-#define	ifv_vid		ifv_mib.ifvm_tag
+#define	ifv_tag		ifv_mib.ifvm_tag
+#define	ifv_vid 	ifv_mib.ifvm_vid
+#define	ifv_pcp		ifv_mib.ifvm_pcp
 #define	ifv_encaplen	ifv_mib.ifvm_encaplen
 #define	ifv_mtufudge	ifv_mib.ifvm_mtufudge
 #define	ifv_mintu	ifv_mib.ifvm_mintu
@@ -147,6 +155,15 @@ static VNET_DEFINE(int, soft_pad);
 SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW | CTLFLAG_VNET,
     &VNET_NAME(soft_pad), 0, "pad short frames before tagging");
 
+/*
+ * For now, make preserving PCP via an mbuf tag optional, as it increases
+ * per-packet memory allocations and frees.  In the future, it would be
+ * preferable to reuse ether_vtag for this, or similar.
+ */
+static int vlan_mtag_pcp = 0;
+SYSCTL_INT(_net_link_vlan, OID_AUTO, mtag_pcp, CTLFLAG_RW, &vlan_mtag_pcp, 0,
+	"Retain VLAN PCP information as packets are passed up the stack");
+
 static const char vlanname[] = "vlan";
 static MALLOC_DEFINE(M_VLAN, vlanname, "802.1Q Virtual LAN Interface");
 
@@ -696,6 +713,16 @@ vlan_devat(struct ifnet *ifp, uint16_t vid)
 	return (ifp);
 }
 
+/*
+ * Recalculate the cached VLAN tag exposed via the MIB.
+ */
+static void
+vlan_tag_recalculate(struct ifvlan *ifv)
+{
+
+       ifv->ifv_tag = EVL_MAKETAG(ifv->ifv_vid, ifv->ifv_pcp, 0);
+}
+
 /*
  * VLAN support can be loaded as a module.  The only place in the
  * system that's intimately aware of this is ether_input.  We hook
@@ -1009,6 +1036,8 @@ vlan_transmit(struct ifnet *ifp, struct mbuf *m)
 {
 	struct ifvlan *ifv;
 	struct ifnet *p;
+	struct m_tag *mtag;
+	uint16_t tag;
 	int error, len, mcast;
 
 	ifv = ifp->if_softc;
@@ -1064,11 +1093,16 @@ vlan_transmit(struct ifnet *ifp, struct mbuf *m)
 	 * knows how to find the VLAN tag to use, so we attach a
 	 * packet tag that holds it.
 	 */
+	if (vlan_mtag_pcp && (mtag = m_tag_locate(m, MTAG_8021Q,
+	    MTAG_8021Q_PCP_OUT, NULL)) != NULL)
+		tag = EVL_MAKETAG(ifv->ifv_vid, *(uint8_t *)(mtag + 1), 0);
+	else
+              tag = ifv->ifv_tag;
 	if (p->if_capenable & IFCAP_VLAN_HWTAGGING) {
-		m->m_pkthdr.ether_vtag = ifv->ifv_vid;
+		m->m_pkthdr.ether_vtag = tag;
 		m->m_flags |= M_VLANTAG;
 	} else {
-		m = ether_vlanencap(m, ifv->ifv_vid);
+		m = ether_vlanencap(m, tag);
 		if (m == NULL) {
 			if_printf(ifp, "unable to prepend VLAN header\n");
 			if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
@@ -1103,7 +1137,8 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
 	struct ifvlantrunk *trunk = ifp->if_vlantrunk;
 	struct ifvlan *ifv;
 	TRUNK_LOCK_READER;
-	uint16_t vid;
+	struct m_tag *mtag;
+	uint16_t vid, tag;
 
 	KASSERT(trunk != NULL, ("%s: no trunk", __func__));
 
@@ -1112,7 +1147,7 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
 		 * Packet is tagged, but m contains a normal
 		 * Ethernet frame; the tag is stored out-of-band.
 		 */
-		vid = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag);
+		tag = m->m_pkthdr.ether_vtag;
 		m->m_flags &= ~M_VLANTAG;
 	} else {
 		struct ether_vlan_header *evl;
@@ -1128,7 +1163,7 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
 				return;
 			}
 			evl = mtod(m, struct ether_vlan_header *);
-			vid = EVL_VLANOFTAG(ntohs(evl->evl_tag));
+			tag = ntohs(evl->evl_tag);
 
 			/*
 			 * Remove the 802.1q header by copying the Ethernet
@@ -1152,6 +1187,8 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
 		}
 	}
 
+	vid = EVL_VLANOFTAG(tag);
+
 	TRUNK_RLOCK(trunk);
 	ifv = vlan_gethash(trunk, vid);
 	if (ifv == NULL || !UP_AND_RUNNING(ifv->ifv_ifp)) {
@@ -1162,6 +1199,28 @@ vlan_input(struct ifnet *ifp, struct mbuf *m)
 	}
 	TRUNK_RUNLOCK(trunk);
 
+	if (vlan_mtag_pcp) {
+		/*
+		 * While uncommon, it is possible that we will find a 802.1q
+		 * packet encapsulated inside another packet that also had an
+		 * 802.1q header.  For example, ethernet tunneled over IPSEC
+		 * arriving over ethernet.  In that case, we replace the
+		 * existing 802.1q PCP m_tag value.
+		 */
+		mtag = m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_IN, NULL);
+		if (mtag == NULL) {
+			mtag = m_tag_alloc(MTAG_8021Q, MTAG_8021Q_PCP_IN,
+			    sizeof(uint8_t), M_NOWAIT);
+			if (mtag == NULL) {
+				m_freem(m);
+				if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
+				return;
+			}
+			m_tag_prepend(m, mtag);
+		}
+		*(uint8_t *)(mtag + 1) = EVL_PRIOFTAG(tag);
+	}
+
 	m->m_pkthdr.rcvif = ifv->ifv_ifp;
 	if_inc_counter(ifv->ifv_ifp, IFCOUNTER_IPACKETS, 1);
 
@@ -1201,7 +1260,7 @@ vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid)
 		vlan_inithash(trunk);
 		VLAN_LOCK();
 		if (p->if_vlantrunk != NULL) {
-			/* A race that that is very unlikely to be hit. */
+			/* A race that is very unlikely to be hit. */
 			vlan_freehash(trunk);
 			free(trunk, M_VLAN);
 			goto exists;
@@ -1218,6 +1277,8 @@ vlan_config(struct ifvlan *ifv, struct ifnet *p, uint16_t vid)
 	}
 
 	ifv->ifv_vid = vid;	/* must set this before vlan_inshash() */
+	ifv->ifv_pcp = 0;       /* Default: best effort delivery. */
+	vlan_tag_recalculate(ifv);
 	error = vlan_inshash(trunk, ifv);
 	if (error)
 		goto done;
@@ -1705,6 +1766,34 @@ vlan_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 		}
 		break;
 
+	case SIOCGVLANPCP:
+#ifdef VIMAGE
+		if (ifp->if_vnet != ifp->if_home_vnet) {
+			error = EPERM;
+			break;
+		}
+#endif
+		ifr->ifr_vlan_pcp = ifv->ifv_pcp;
+		break;
+
+	case SIOCSVLANPCP:
+#ifdef VIMAGE
+		if (ifp->if_vnet != ifp->if_home_vnet) {
+			error = EPERM;
+			break;
+		}
+#endif
+		error = priv_check(curthread, PRIV_NET_SETVLANPCP);
+		if (error)
+			break;
+		if (ifr->ifr_vlan_pcp > 7) {
+			error = EINVAL;
+			break;
+		}
+		ifv->ifv_pcp = ifr->ifr_vlan_pcp;
+		vlan_tag_recalculate(ifv);
+		break;
+
 	default:
 		error = EINVAL;
 		break;

sys/net/if_vlan_var.h

@@ -73,6 +73,23 @@ struct	vlanreq {
 #define	SIOCSETVLAN	SIOCSIFGENERIC
 #define	SIOCGETVLAN	SIOCGIFGENERIC
 
+#define	SIOCGVLANPCP	_IOWR('i', 152, struct ifreq)	/* Get VLAN PCP */
+#define	SIOCSVLANPCP	 _IOW('i', 153, struct ifreq)	/* Set VLAN PCP */
+
+/*
+ * Names for 802.1q priorities ("802.1p").  Notice that in this scheme,
+ * (0 < 1), allowing default 0-tagged traffic to take priority over background
+ * tagged traffic.
+ */
+#define	IEEE8021Q_PCP_BK	1	/* Background (lowest) */
+#define	IEEE8021Q_PCP_BE	0	/* Best effort (default) */
+#define	IEEE8021Q_PCP_EE	2	/* Excellent effort */
+#define	IEEE8021Q_PCP_CA	3	/* Critical applications */
+#define	IEEE8021Q_PCP_VI	4	/* Video, < 100ms latency */
+#define	IEEE8021Q_PCP_VO	5	/* Video, < 10ms latency */
+#define	IEEE8021Q_PCP_IC	6	/* Internetwork control */
+#define	IEEE8021Q_PCP_NC	7	/* Network control (highest) */
+
 #ifdef _KERNEL
 /*
  * Drivers that are capable of adding and removing the VLAN header
@@ -110,6 +127,16 @@ struct	vlanreq {
  * if_capabilities.
  */
 
+/*
+ * The 802.1q code may also tag mbufs with the PCP (priority) field for use in
+ * other layers of the stack, in which case an m_tag will be used.  This is
+ * semantically quite different from use of the ether_vtag field, which is
+ * defined only between the device driver and VLAN layer.
+ */
+#define	MTAG_8021Q		1326104895
+#define	MTAG_8021Q_PCP_IN	0		/* Input priority. */
+#define	MTAG_8021Q_PCP_OUT	1		/* Output priority. */
+
 #define	VLAN_CAPABILITIES(_ifp) do {				\
 	if ((_ifp)->if_vlantrunk != NULL) 			\
 		(*vlan_trunk_cap_p)(_ifp);			\

sys/sys/priv.h

@@ -342,6 +342,7 @@
 #define	PRIV_NET_SETIFDESCR	418	/* Set interface description. */
 #define	PRIV_NET_SETIFFIB	419	/* Set interface fib. */
 #define	PRIV_NET_VXLAN		420	/* Administer vxlan. */
+#define	PRIV_NET_SETVLANPCP	421	/* Set VLAN priority. */
 
 /*
  * 802.11-related privileges.