Author: bz
Date: Wed Jun 24 22:21:30 2009
New Revision: 194927
URL: http://svn.freebsd.org/changeset/base/194927
Log:
Merge from p4: CH154790,154793,154874
Import if_epair(4), a virtual cross-over Ethernet-like interface pair.
Note these files are 1:1 from p4 and not yet connected to the build
not knowing about the new netisr interface.
Sponsored by: The FreeBSD Foundation
Added:
head/share/man/man4/epair.4 (contents, props changed)
head/sys/net/if_epair.c (contents, props changed)
Added: head/share/man/man4/epair.4
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/man/man4/epair.4 Wed Jun 24 22:21:30 2009 (r194927)
@@ -0,0 +1,120 @@
+.\"-
+.\" Copyright (c) 2008 The FreeBSD Foundation
+.\" All rights reserved.
+.\"
+.\" This software was developed by CK Software GmbH under sponsorship
+.\" from the FreeBSD Foundation.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd December 15, 2008
+.Dt EPAIR 4
+.Os
+.Sh NAME
+.Nm epair
+.Nd Virtual cross-over Ethernet-like interface pair.
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device epair"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+if_epair_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+is a pair of Ethernet-like software interfaces,
+which are directly connected by a virtual cross-over cable.
+.Pp
+Each
+.Nm
+interface pair is created at runtime using interface cloning.
+This is most easily done with the
+.Xr ifconfig 8
+.Cm create
+command or using the
+.Va cloned_interfaces
+variable in
+.Xr rc.conf 5 .
+While for cloning you only give either
+.Pa epair
+or
+.Pa epair<n>
+the
+.Nm
+pair will be named like
+.Pa epair<n>[ab] .
+This means the names of the first
+.Nm
+interfaces will be
+.Pa epair0a
+and
+.Pa epair0b .
+.Pp
+Like any other Ethernet interface, an
+.Nm
+needs to have a network address.
+Each
+.Nm
+will be assigned a locally administered address by default,
+that is only guaranteed to be unique within one network stack.
+To change the default addresses one may use the SIOCSIFADDR ioctl(2) or
+ifconfig(8) utility.
+.Pp
+The basic intend is to provide connectivity between two virtual
+network stack instances.
+When connected to a
+.Xr if_bridge 4
+one end of the interface pair can also be part of another (virtual) LAN.
+As with any other Ethernet interface one can configure
+.Xr vlan 4
+support on top of it.
+.Pp
+.Sh SEE ALSO
+.Xr ioctl 2 ,
+.Xr altq 4 ,
+.Xr bpf 4 ,
+.Xr if_bridge 4 ,
+.Xr vlan 4 ,
+.Xr loader.conf 5,
+.Xr rc.conf 5 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+interface first appeared in
+.Fx 8.0 .
+.Sh AUTHORS
+The
+.Nm
+interface was written by
+.An Bjoern A. Zeeb, CK Software GmbH,
+under sponsorship from the FreeBSD Foundation.
Added: head/sys/net/if_epair.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/net/if_epair.c Wed Jun 24 22:21:30 2009 (r194927)
@@ -0,0 +1,728 @@
+/*-
+ * Copyright (c) 2008 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by CK Software GmbH under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * A pair of virtual ethernet interfaces directly connected with
+ * a virtual cross-over cable.
+ * This is mostly intended to be used to provide connectivity between
+ * different virtual network stack instances.
+ */
+/*
+ * Things to re-think once we have more experience:
+ * - ifp->if_reassign function once we can test with vimage.
+ * - Real random etheraddrs that are checked to be uniquish;
+ * in case we bridge we may need this or let the user handle that case?
+ * - netisr and callback logic.
+ * - netisr queue lengths.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <sys/refcount.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <sys/vimage.h>
+
+#include <net/bpf.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <net/if_clone.h>
+#include <net/if_var.h>
+#include <net/if_types.h>
+#include <net/netisr.h>
+
+#define EPAIRNAME "epair"
+
+#ifdef DEBUG_EPAIR
+static int epair_debug = 0;
+SYSCTL_DECL(_net_link);
+SYSCTL_NODE(_net_link, OID_AUTO, epair, CTLFLAG_RW, 0, "epair sysctl");
+SYSCTL_XINT(_net_link_epair, OID_AUTO, epair_debug, CTLFLAG_RW,
+ &epair_debug, 0, "if_epair(4) debugging.");
+#define DPRINTF(fmt, arg...) if (epair_debug) \
+ printf("[%s:%d] " fmt, __func__, __LINE__, ##arg)
+#else
+#define DPRINTF(fmt, arg...)
+#endif
+
+struct epair_softc {
+ struct ifnet *ifp;
+ struct ifnet *oifp;
+ u_int refcount;
+ void (*if_qflush)(struct ifnet *);
+};
+
+struct epair_ifp_drain {
+ STAILQ_ENTRY(epair_ifp_drain) ifp_next;
+ struct ifnet *ifp;
+};
+
+static STAILQ_HEAD(, epair_ifp_drain) epair_ifp_drain_list =
+ STAILQ_HEAD_INITIALIZER(epair_ifp_drain_list);
+
+#define ADD_IFQ_FOR_DRAINING(ifp) \
+ do { \
+ struct epair_ifp_drain *elm = NULL; \
+ \
+ STAILQ_FOREACH(elm, &epair_ifp_drain_list, ifp_next) { \
+ if (elm->ifp == (ifp)) \
+ break; \
+ } \
+ if (elm == NULL) { \
+ elm = malloc(sizeof(struct epair_ifp_drain), \
+ M_EPAIR, M_ZERO); \
+ if (elm != NULL) { \
+ elm->ifp = (ifp); \
+ STAILQ_INSERT_TAIL( \
+ &epair_ifp_drain_list, \
+ elm, ifp_next); \
+ } \
+ } \
+ } while(0)
+
+/* Our "hw" tx queue. */
+static struct ifqueue epairinq;
+static int epair_drv_flags;
+
+static struct mtx if_epair_mtx;
+#define EPAIR_LOCK_INIT() mtx_init(&if_epair_mtx, "if_epair", \
+ NULL, MTX_DEF)
+#define EPAIR_LOCK_DESTROY() mtx_destroy(&if_epair_mtx)
+#define EPAIR_LOCK_ASSERT() mtx_assert(&if_epair_mtx, MA_OWNED)
+#define EPAIR_LOCK() mtx_lock(&if_epair_mtx)
+#define EPAIR_UNLOCK() mtx_unlock(&if_epair_mtx)
+
+static MALLOC_DEFINE(M_EPAIR, EPAIRNAME,
+ "Pair of virtual cross-over connected Ethernet-like interfaces");
+
+static int epair_clone_match(struct if_clone *, const char *);
+static int epair_clone_create(struct if_clone *, char *, size_t, caddr_t);
+static int epair_clone_destroy(struct if_clone *, struct ifnet *);
+
+static void epair_start_locked(struct ifnet *);
+
+static struct if_clone epair_cloner = IFC_CLONE_INITIALIZER(
+ EPAIRNAME, NULL, IF_MAXUNIT,
+ NULL, epair_clone_match, epair_clone_create, epair_clone_destroy);
+
+
+/*
+ * Netisr handler functions.
+ */
+static void
+epair_sintr(struct mbuf *m)
+{
+ struct ifnet *ifp;
+ struct epair_softc *sc;
+
+ ifp = m->m_pkthdr.rcvif;
+ (*ifp->if_input)(ifp, m);
+ sc = ifp->if_softc;
+ refcount_release(&sc->refcount);
+ DPRINTF("ifp=%p refcount=%u\n", ifp, sc->refcount);
+}
+
+static void
+epair_sintr_drained(void)
+{
+ struct epair_ifp_drain *elm, *tvar;
+ struct ifnet *ifp;
+
+ EPAIR_LOCK();
+ /*
+ * Assume our "hw" queue and possibly ifq will be emptied
+ * again. In case we will overflow the "hw" queue while
+ * draining, epair_start_locked will set IFF_DRV_OACTIVE
+ * again and we will stop and return.
+ */
+ STAILQ_FOREACH_SAFE(elm, &epair_ifp_drain_list, ifp_next, tvar) {
+ ifp = elm->ifp;
+ epair_drv_flags &= ~IFF_DRV_OACTIVE;
+ ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+ epair_start_locked(ifp);
+
+ IFQ_LOCK(&ifp->if_snd);
+ if (IFQ_IS_EMPTY(&ifp->if_snd)) {
+ STAILQ_REMOVE(&epair_ifp_drain_list, elm,
+ epair_ifp_drain, ifp_next);
+ free(elm, M_EPAIR);
+ }
+ IFQ_UNLOCK(&ifp->if_snd);
+
+ if ((ifp->if_drv_flags & IFF_DRV_OACTIVE) != 0) {
+ /* Our "hw"q overflew again. */
+ epair_drv_flags |= IFF_DRV_OACTIVE
+ DPRINTF("hw queue length overflow at %u\n",
+ epairinq.ifq_maxlen);
+#if 0
+ /* ``Auto-tuning.'' */
+ epairinq.ifq_maxlen += ifqmaxlen;
+#endif
+ break;
+ }
+ }
+ EPAIR_UNLOCK();
+}
+
+/*
+ * Network interface (`if') related functions.
+ */
+static void
+epair_start_locked(struct ifnet *ifp)
+{
+ struct mbuf *m;
+ struct epair_softc *sc;
+ struct ifnet *oifp;
+ int error;
+
+ EPAIR_LOCK_ASSERT();
+ DPRINTF("ifp=%p\n", ifp);
+
+ if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
+ return;
+ if ((ifp->if_flags & IFF_UP) == 0)
+ return;
+
+ /*
+ * We get patckets here from ether_output via if_handoff()
+ * and ned to put them into the input queue of the oifp
+ * and call oifp->if_input() via netisr/epair_sintr().
+ */
+ sc = ifp->if_softc;
+ oifp = sc->oifp;
+ sc = oifp->if_softc;
+ for (;;) {
+ IFQ_DEQUEUE(&ifp->if_snd, m);
+ if (m == NULL)
+ break;
+ BPF_MTAP(ifp, m);
+
+ /*
+ * In case the outgoing interface is not usable,
+ * drop the packet.
+ */
+ if ((oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
+ (oifp->if_flags & IFF_UP) ==0) {
+ ifp->if_oerrors++;
+ m_freem(m);
+ continue;
+ }
+ DPRINTF("packet %s -> %s\n", ifp->if_xname, oifp->if_xname);
+
+ /*
+ * Add a reference so the interface cannot go while the
+ * packet is in transit as we rely on rcvif to stay valid.
+ */
+ refcount_acquire(&sc->refcount);
+ m->m_pkthdr.rcvif = oifp;
+ CURVNET_SET_QUIET(oifp->if_vnet);
+ error = netisr_queue(NETISR_EPAIR, m);
+ CURVNET_RESTORE();
+ if (!error) {
+ ifp->if_opackets++;
+ /* Someone else received the packet. */
+ oifp->if_ipackets++;
+ } else {
+ epair_drv_flags |= IFF_DRV_OACTIVE;
+ ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+ ADD_IFQ_FOR_DRAINING(ifp);
+ refcount_release(&sc->refcount);
+ }
+ }
+}
+
+static void
+epair_start(struct ifnet *ifp)
+{
+
+ EPAIR_LOCK();
+ epair_start_locked(ifp);
+ EPAIR_UNLOCK();
+}
+
+static int
+epair_transmit_locked(struct ifnet *ifp, struct mbuf *m)
+{
+ struct epair_softc *sc;
+ struct ifnet *oifp;
+ int error, len;
+ short mflags;
+
+ EPAIR_LOCK_ASSERT();
+ DPRINTF("ifp=%p m=%p\n", ifp, m);
+
+ if (m == NULL)
+ return (0);
+
+ /*
+ * We are not going to use the interface en/dequeue mechanism
+ * on the TX side. We are called from ether_output_frame()
+ * and will put the packet into the incoming queue of the
+ * other interface of our pair via the netsir.
+ */
+ if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
+ m_freem(m);
+ return (ENXIO);
+ }
+ if ((ifp->if_flags & IFF_UP) == 0) {
+ m_freem(m);
+ return (ENETDOWN);
+ }
+
+ BPF_MTAP(ifp, m);
+
+ /*
+ * In case the outgoing interface is not usable,
+ * drop the packet.
+ */
+ sc = ifp->if_softc;
+ oifp = sc->oifp;
+ if ((oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
+ (oifp->if_flags & IFF_UP) ==0) {
+ ifp->if_oerrors++;
+ m_freem(m);
+ return (0);
+ }
+ len = m->m_pkthdr.len;
+ mflags = m->m_flags;
+ DPRINTF("packet %s -> %s\n", ifp->if_xname, oifp->if_xname);
+
+#ifdef ALTQ
+ /* Support ALTQ via the clasic if_start() path. */
+ IF_LOCK(&ifp->if_snd);
+ if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
+ ALTQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
+ if (error)
+ ifp->if_snd.ifq_drops++;
+ IF_UNLOCK(&ifp->if_snd);
+ if (!error) {
+ ifp->if_obytes += len;
+ if (mflags & (M_BCAST|M_MCAST))
+ ifp->if_omcasts++;
+
+ if ((ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
+ epair_start_locked(ifp);
+ else
+ ADD_IFQ_FOR_DRAINING(ifp);
+ }
+ return (error);
+ }
+ IF_UNLOCK(&ifp->if_snd);
+#endif
+
+ if ((epair_drv_flags & IFF_DRV_OACTIVE) != 0) {
+ /*
+ * Our hardware queue is full, try to fall back
+ * queuing to the ifq but do not call ifp->if_start.
+ * Either we are lucky or the packet is gone.
+ */
+ IFQ_ENQUEUE(&ifp->if_snd, m, error);
+ if (!error)
+ ADD_IFQ_FOR_DRAINING(ifp);
+ return (error);
+ }
+ sc = oifp->if_softc;
+ /*
+ * Add a reference so the interface cannot go while the
+ * packet is in transit as we rely on rcvif to stay valid.
+ */
+ refcount_acquire(&sc->refcount);
+ m->m_pkthdr.rcvif = oifp;
+ CURVNET_SET_QUIET(oifp->if_vnet);
+ error = netisr_queue(NETISR_EPAIR, m);
+ CURVNET_RESTORE();
+ if (!error) {
+ ifp->if_opackets++;
+ /*
+ * IFQ_HANDOFF_ADJ/ip_handoff() update statistics,
+ * but as we bypass all this we have to duplicate
+ * the logic another time.
+ */
+ ifp->if_obytes += len;
+ if (mflags & (M_BCAST|M_MCAST))
+ ifp->if_omcasts++;
+ /* Someone else received the packet. */
+ oifp->if_ipackets++;
+ } else {
+ /* The packet was freed already. */
+ refcount_release(&sc->refcount);
+ epair_drv_flags |= IFF_DRV_OACTIVE;
+ ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+ }
+
+ return (error);
+}
+
+static int
+epair_transmit(struct ifnet *ifp, struct mbuf *m)
+{
+ int error;
+
+ EPAIR_LOCK();
+ error = epair_transmit_locked(ifp, m);
+ EPAIR_UNLOCK();
+ return (error);
+}
+
+static void
+epair_qflush(struct ifnet *ifp)
+{
+ struct epair_softc *sc;
+ struct ifaltq *ifq;
+
+ EPAIR_LOCK();
+ sc = ifp->if_softc;
+ ifq = &ifp->if_snd;
+ DPRINTF("ifp=%p sc refcnt=%u ifq_len=%u\n",
+ ifp, sc->refcount, ifq->ifq_len);
+ /*
+ * Instead of calling refcount_release(&sc->refcount);
+ * n times, just subtract for the cleanup.
+ */
+ sc->refcount -= ifq->ifq_len;
+ EPAIR_UNLOCK();
+ if (sc->if_qflush)
+ sc->if_qflush(ifp);
+}
+
+static int
+epair_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+ struct ifreq *ifr;
+ int error;
+
+ ifr = (struct ifreq *)data;
+ switch (cmd) {
+ case SIOCSIFFLAGS:
+ case SIOCADDMULTI:
+ case SIOCDELMULTI:
+ error = 0;
+ break;
+
+ default:
+ /* Let the common ethernet handler process this. */
+ error = ether_ioctl(ifp, cmd, data);
+ break;
+ }
+
+ return (error);
+}
+
+static void
+epair_init(void *dummy __unused)
+{
+}
+
+
+/*
+ * Interface cloning functions.
+ * We use our private ones so that we can create/destroy our secondary
+ * device along with the primary one.
+ */
+static int
+epair_clone_match(struct if_clone *ifc, const char *name)
+{
+ const char *cp;
+
+ DPRINTF("name='%s'\n", name);
+
+ /*
+ * Our base name is epair.
+ * Our interfaces will be named epair<n>[ab].
+ * So accept anything of the following list:
+ * - epair
+ * - epair<n>
+ * but not the epair<n>[ab] versions.
+ */
+ if (strncmp(EPAIRNAME, name, sizeof(EPAIRNAME)-1) != 0)
+ return (0);
+
+ for (cp = name + sizeof(EPAIRNAME) - 1; *cp != '\0'; cp++) {
+ if (*cp < '0' || *cp > '9')
+ return (0);
+ }
+
+ return (1);
+}
+
+static int
+epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t
params)
+{
+ struct epair_softc *sca, *scb;
+ struct ifnet *ifp;
+ char *dp;
+ int error, unit, wildcard;
+ uint8_t eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
+
+ /*
+ * We are abusing params to create our second interface.
+ * Actually we already created it and called if_clone_createif()
+ * for it to do the official insertion procedure the moment we knew
+ * it cannot fail anymore. So just do attach it here.
+ */
+ if (params) {
+ scb = (struct epair_softc *)params;
+ ifp = scb->ifp;
+ /* Assign a hopefully unique, locally administered etheraddr. */
+ eaddr[0] = 0x02;
+ eaddr[3] = (ifp->if_index >> 8) & 0xff;
+ eaddr[4] = ifp->if_index & 0xff;
+ eaddr[5] = 0x0b;
+ ether_ifattach(ifp, eaddr);
+ /* Correctly set the name for the cloner list. */
+ strlcpy(name, scb->ifp->if_xname, len);
+ return (0);
+ }
+
+ /* Try to see if a special unit was requested. */
+ error = ifc_name2unit(name, &unit);
+ if (error != 0)
+ return (error);
+ wildcard = (unit < 0);
+
+ error = ifc_alloc_unit(ifc, &unit);
+ if (error != 0)
+ return (error);
+
+ /*
+ * If no unit had been given, we need to adjust the ifName.
+ * Also make sure there is space for our extra [ab] suffix.
+ */
+ for (dp = name; *dp != '\0'; dp++);
+ if (wildcard) {
+ error = snprintf(dp, len - (dp - name), "%d", unit);
+ if (error > len - (dp - name) - 1) {
+ /* ifName too long. */
+ ifc_free_unit(ifc, unit);
+ return (ENOSPC);
+ }
+ dp += error;
+ }
+ if (len - (dp - name) - 1 < 1) {
+ /* No space left for our [ab] suffix. */
+ ifc_free_unit(ifc, unit);
+ return (ENOSPC);
+ }
+ *dp = 'a';
+ /* Must not change dp so we can replace 'a' by 'b' later. */
+ *(dp+1) = '\0';
+
+ /* Allocate memory for both [ab] interfaces */
+ sca = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
+ refcount_init(&sca->refcount, 1);
+ sca->ifp = if_alloc(IFT_ETHER);
+ if (sca->ifp == NULL) {
+ free(sca, M_EPAIR);
+ ifc_free_unit(ifc, unit);
+ return (ENOSPC);
+ }
+
+ scb = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
+ refcount_init(&scb->refcount, 1);
+ scb->ifp = if_alloc(IFT_ETHER);
+ if (scb->ifp == NULL) {
+ free(scb, M_EPAIR);
+ if_free(sca->ifp);
+ free(sca, M_EPAIR);
+ ifc_free_unit(ifc, unit);
+ return (ENOSPC);
+ }
+
+ /*
+ * Cross-reference the interfaces so we will be able to free both.
+ */
+ sca->oifp = scb->ifp;
+ scb->oifp = sca->ifp;
+
+ /* Finish initialization of interface <n>a. */
+ ifp = sca->ifp;
+ ifp->if_softc = sca;
+ strlcpy(ifp->if_xname, name, IFNAMSIZ);
+ ifp->if_dname = ifc->ifc_name;
+ ifp->if_dunit = unit;
+ ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+ ifp->if_start = epair_start;
+ ifp->if_ioctl = epair_ioctl;
+ ifp->if_init = epair_init;
+ ifp->if_snd.ifq_maxlen = ifqmaxlen;
+ /* Assign a hopefully unique, locally administered etheraddr. */
+ eaddr[0] = 0x02;
+ eaddr[3] = (ifp->if_index >> 8) & 0xff;
+ eaddr[4] = ifp->if_index & 0xff;
+ eaddr[5] = 0x0a;
+ ether_ifattach(ifp, eaddr);
+ sca->if_qflush = ifp->if_qflush;
+ ifp->if_qflush = epair_qflush;
+ ifp->if_transmit = epair_transmit;
+ ifp->if_baudrate = IF_Gbps(10UL); /* arbitrary maximum */
+
+ /* Swap the name and finish initialization of interface <n>b. */
+ *dp = 'b';
+
+ ifp = scb->ifp;
+ ifp->if_softc = scb;
+ strlcpy(ifp->if_xname, name, IFNAMSIZ);
+ ifp->if_dname = ifc->ifc_name;
+ ifp->if_dunit = unit;
+ ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+ ifp->if_start = epair_start;
+ ifp->if_ioctl = epair_ioctl;
+ ifp->if_init = epair_init;
+ ifp->if_snd.ifq_maxlen = ifqmaxlen;
+ /* We need to play some tricks here for the second interface. */
+ strlcpy(name, EPAIRNAME, len);
+ error = if_clone_create(name, len, (caddr_t)scb);
+ if (error)
+ panic("%s: if_clone_createif() for our 2nd iface failed: %d",
+ __func__, error);
+ scb->if_qflush = ifp->if_qflush;
+ ifp->if_qflush = epair_qflush;
+ ifp->if_transmit = epair_transmit;
+ ifp->if_baudrate = IF_Gbps(10UL); /* arbitrary maximum */
+
+ /*
+ * Restore name to <n>a as the ifp for this will go into the
+ * cloner list for the initial call.
+ */
+ strlcpy(name, sca->ifp->if_xname, len);
+ DPRINTF("name='%s/%db' created sca=%p scb=%p\n", name, unit, sca, scb);
+
+ /* Tell the world, that we are ready to rock. */
+ sca->ifp->if_drv_flags |= IFF_DRV_RUNNING;
+ scb->ifp->if_drv_flags |= IFF_DRV_RUNNING;
+
+ return (0);
+}
+
+static int
+epair_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
+{
+ struct ifnet *oifp;
+ struct epair_softc *sca, *scb;
+ int unit, error;
+
+ DPRINTF("ifp=%p\n", ifp);
+
+ /*
+ * In case we called into if_clone_destroyif() ourselves
+ * again to remove the second interface, the softc will be
+ * NULL. In that case so not do anything but return success.
+ */
+ if (ifp->if_softc == NULL)
+ return (0);
+
+ unit = ifp->if_dunit;
+ sca = ifp->if_softc;
+ oifp = sca->oifp;
+ scb = oifp->if_softc;
+
+ DPRINTF("ifp=%p oifp=%p\n", ifp, oifp);
+ ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
+ oifp->if_drv_flags &= ~IFF_DRV_RUNNING;
+ ether_ifdetach(oifp);
+ ether_ifdetach(ifp);
+ /*
+ * Wait for all packets to be dispatched to if_input.
+ * The numbers can only go down as the interfaces are
+ * detached so there is no need to use atomics.
+ */
+ DPRINTF("sca refcnt=%u scb refcnt=%u\n", sca->refcount, scb->refcount);
+ KASSERT(sca->refcount == 1 && scb->refcount == 1,
+ ("%s: sca->refcount!=1: %d || scb->refcount!=1: %d",
+ __func__, sca->refcount, scb->refcount));
+
+ /*
+ * Get rid of our second half.
+ */
+ oifp->if_softc = NULL;
+ error = if_clone_destroyif(ifc, oifp);
+ if (error)
+ panic("%s: if_clone_destroyif() for our 2nd iface failed: %d",
+ __func__, error);
+
+ /* Finish cleaning up. Free them and release the unit. */
+ if_free_type(oifp, IFT_ETHER);
+ if_free_type(ifp, IFT_ETHER);
+ free(scb, M_EPAIR);
+ free(sca, M_EPAIR);
+ ifc_free_unit(ifc, unit);
+
+ return (0);
+}
+
+static int
+epair_modevent(module_t mod, int type, void *data)
+{
+ int tmp;
+
+ switch (type) {
+ case MOD_LOAD:
+ /* For now limit us to one global mutex and one inq. */
+ EPAIR_LOCK_INIT();
+ epair_drv_flags = 0;
+ epairinq.ifq_maxlen = 16 * ifqmaxlen; /* What is a good 16? */
+ if (TUNABLE_INT_FETCH("net.link.epair.netisr_maxqlen", &tmp))
+ epairinq.ifq_maxlen = tmp;
+ mtx_init(&epairinq.ifq_mtx, "epair_inq", NULL, MTX_DEF);
+ netisr_register2(NETISR_EPAIR, (netisr_t *)epair_sintr,
+ epair_sintr_drained, &epairinq, 0);
+ if_clone_attach(&epair_cloner);
+ if (bootverbose)
+ printf("%s initialized.\n", EPAIRNAME);
+ break;
+ case MOD_UNLOAD:
+ if_clone_detach(&epair_cloner);
+ netisr_unregister(NETISR_EPAIR);
+ mtx_destroy(&epairinq.ifq_mtx);
+ EPAIR_LOCK_DESTROY();
+ if (bootverbose)
+ printf("%s unloaded.\n", EPAIRNAME);
+ break;
+ default:
+ return (EOPNOTSUPP);
+ }
+ return (0);
+}
+
+static moduledata_t epair_mod = {
+ "if_epair",
+ epair_modevent,
+ 0
+};
+
+DECLARE_MODULE(if_epair, epair_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
+MODULE_VERSION(if_epair, 1);
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