2 * Copyright (c) 2008 The FreeBSD Foundation
3 * Copyright (c) 2009 Bjoern A. Zeeb <bz@FreeBSD.org>
6 * This software was developed by CK Software GmbH under sponsorship
7 * from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * A pair of virtual back-to-back connected ethernet like interfaces
33 * (``two interfaces with a virtual cross-over cable'').
35 * This is mostly intended to be used to provide connectivity between
36 * different virtual network stack instances.
39 * Things to re-think once we have more experience:
40 * - ifp->if_reassign function once we can test with vimage. Depending on
41 * how if_vmove() is going to be improved.
42 * - Real random etheraddrs that are checked to be uniquish; we would need
43 * to re-do them in case we move the interface between network stacks
44 * in a private if_reassign function.
45 * In case we bridge to a real interface/network or between indepedent
46 * epairs on multiple stacks/machines, we may need this.
47 * For now let the user handle that case.
50 #include <sys/cdefs.h>
51 __FBSDID("$FreeBSD$");
53 #include <sys/param.h>
54 #include <sys/kernel.h>
56 #include <sys/module.h>
57 #include <sys/refcount.h>
58 #include <sys/queue.h>
60 #include <sys/socket.h>
61 #include <sys/sockio.h>
62 #include <sys/sysctl.h>
63 #include <sys/types.h>
66 #include <net/ethernet.h>
68 #include <net/if_clone.h>
69 #include <net/if_var.h>
70 #include <net/if_types.h>
71 #include <net/netisr.h>
74 #define EPAIRNAME "epair"
76 SYSCTL_DECL(_net_link);
77 SYSCTL_NODE(_net_link, OID_AUTO, epair, CTLFLAG_RW, 0, "epair sysctl");
80 static int epair_debug = 0;
81 SYSCTL_XINT(_net_link_epair, OID_AUTO, epair_debug, CTLFLAG_RW,
82 &epair_debug, 0, "if_epair(4) debugging.");
83 #define DPRINTF(fmt, arg...) \
85 printf("[%s:%d] " fmt, __func__, __LINE__, ##arg)
87 #define DPRINTF(fmt, arg...)
90 static void epair_nh_sintr(struct mbuf *);
91 static struct mbuf *epair_nh_m2cpuid(struct mbuf *, uintptr_t, u_int *);
92 static void epair_nh_drainedcpu(u_int);
94 static void epair_start_locked(struct ifnet *);
96 static int epair_clone_match(struct if_clone *, const char *);
97 static int epair_clone_create(struct if_clone *, char *, size_t, caddr_t);
98 static int epair_clone_destroy(struct if_clone *, struct ifnet *);
100 /* Netisr realted definitions and sysctl. */
101 static struct netisr_handler epair_nh = {
102 .nh_name = EPAIRNAME,
103 .nh_proto = NETISR_EPAIR,
104 .nh_policy = NETISR_POLICY_CPU,
105 .nh_handler = epair_nh_sintr,
106 .nh_m2cpuid = epair_nh_m2cpuid,
107 .nh_drainedcpu = epair_nh_drainedcpu,
111 sysctl_epair_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
115 netisr_getqlimit(&epair_nh, &qlimit);
116 error = sysctl_handle_int(oidp, &qlimit, 0, req);
117 if (error || !req->newptr)
121 return (netisr_setqlimit(&epair_nh, qlimit));
123 SYSCTL_PROC(_net_link_epair, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
124 0, 0, sysctl_epair_netisr_maxqlen, "I",
125 "Maximum if_epair(4) netisr \"hw\" queue length");
128 struct ifnet *ifp; /* This ifp. */
129 struct ifnet *oifp; /* other ifp of pair. */
130 u_int refcount; /* # of mbufs in flight. */
131 u_int cpuid; /* CPU ID assigned upon creation. */
132 void (*if_qflush)(struct ifnet *);
133 /* Original if_qflush routine. */
137 * Per-CPU list of ifps with data in the ifq that needs to be flushed
138 * to the netisr ``hw'' queue before we allow any further direct queuing
139 * to the ``hw'' queue.
141 struct epair_ifp_drain {
142 STAILQ_ENTRY(epair_ifp_drain) ifp_next;
145 STAILQ_HEAD(eid_list, epair_ifp_drain);
147 #define EPAIR_LOCK_INIT(dpcpu) mtx_init(&(dpcpu)->if_epair_mtx, \
148 "if_epair", NULL, MTX_DEF)
149 #define EPAIR_LOCK_DESTROY(dpcpu) mtx_destroy(&(dpcpu)->if_epair_mtx)
150 #define EPAIR_LOCK_ASSERT(dpcpu) mtx_assert(&(dpcpu)->if_epair_mtx, \
152 #define EPAIR_LOCK(dpcpu) mtx_lock(&(dpcpu)->if_epair_mtx)
153 #define EPAIR_UNLOCK(dpcpu) mtx_unlock(&(dpcpu)->if_epair_mtx)
156 #define EPAIR_REFCOUNT_INIT(r, v) refcount_init((r), (v))
157 #define EPAIR_REFCOUNT_AQUIRE(r) refcount_acquire((r))
158 #define EPAIR_REFCOUNT_RELEASE(r) refcount_release((r))
159 #define EPAIR_REFCOUNT_ASSERT(a, p) KASSERT(a, p)
161 #define EPAIR_REFCOUNT_INIT(r, v)
162 #define EPAIR_REFCOUNT_AQUIRE(r)
163 #define EPAIR_REFCOUNT_RELEASE(r)
164 #define EPAIR_REFCOUNT_ASSERT(a, p)
167 static MALLOC_DEFINE(M_EPAIR, EPAIRNAME,
168 "Pair of virtual cross-over connected Ethernet-like interfaces");
170 static struct if_clone epair_cloner = IFC_CLONE_INITIALIZER(
171 EPAIRNAME, NULL, IF_MAXUNIT,
172 NULL, epair_clone_match, epair_clone_create, epair_clone_destroy);
175 * DPCPU area and functions.
178 struct mtx if_epair_mtx; /* Per-CPU locking. */
179 int epair_drv_flags; /* Per-CPU ``hw'' drv flags. */
180 struct eid_list epair_ifp_drain_list; /* Per-CPU list of ifps with
181 * data in the ifq. */
183 DPCPU_DEFINE(struct epair_dpcpu, epair_dpcpu);
186 epair_dpcpu_init(void)
188 struct epair_dpcpu *epair_dpcpu;
192 for (cpuid = 0; cpuid <= mp_maxid; cpuid++) {
193 if (CPU_ABSENT(cpuid))
196 epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
198 /* Initialize per-cpu lock. */
199 EPAIR_LOCK_INIT(epair_dpcpu);
201 /* Driver flags are per-cpu as are our netisr "hw" queues. */
202 epair_dpcpu->epair_drv_flags = 0;
205 * Initialize per-cpu drain list.
206 * Manually do what STAILQ_HEAD_INITIALIZER would do.
208 s = &epair_dpcpu->epair_ifp_drain_list;
209 s->stqh_first = NULL;
210 s->stqh_last = &s->stqh_first;
215 epair_dpcpu_detach(void)
217 struct epair_dpcpu *epair_dpcpu;
220 for (cpuid = 0; cpuid <= mp_maxid; cpuid++) {
221 if (CPU_ABSENT(cpuid))
224 epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
226 /* Destroy per-cpu lock. */
227 EPAIR_LOCK_DESTROY(epair_dpcpu);
235 cpuid_from_ifp(struct ifnet *ifp)
237 struct epair_softc *sc;
247 * Netisr handler functions.
250 epair_nh_sintr(struct mbuf *m)
253 struct epair_softc *sc;
255 ifp = m->m_pkthdr.rcvif;
256 (*ifp->if_input)(ifp, m);
258 EPAIR_REFCOUNT_RELEASE(&sc->refcount);
259 DPRINTF("ifp=%p refcount=%u\n", ifp, sc->refcount);
263 epair_nh_m2cpuid(struct mbuf *m, uintptr_t source, u_int *cpuid)
266 *cpuid = cpuid_from_ifp(m->m_pkthdr.rcvif);
272 epair_nh_drainedcpu(u_int cpuid)
274 struct epair_dpcpu *epair_dpcpu;
275 struct epair_ifp_drain *elm, *tvar;
278 epair_dpcpu = DPCPU_ID_PTR(cpuid, epair_dpcpu);
279 EPAIR_LOCK(epair_dpcpu);
281 * Assume our "hw" queue and possibly ifq will be emptied
282 * again. In case we will overflow the "hw" queue while
283 * draining, epair_start_locked will set IFF_DRV_OACTIVE
284 * again and we will stop and return.
286 STAILQ_FOREACH_SAFE(elm, &epair_dpcpu->epair_ifp_drain_list,
289 epair_dpcpu->epair_drv_flags &= ~IFF_DRV_OACTIVE;
290 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
291 epair_start_locked(ifp);
293 IFQ_LOCK(&ifp->if_snd);
294 if (IFQ_IS_EMPTY(&ifp->if_snd)) {
295 STAILQ_REMOVE(&epair_dpcpu->epair_ifp_drain_list,
296 elm, epair_ifp_drain, ifp_next);
299 IFQ_UNLOCK(&ifp->if_snd);
301 if ((ifp->if_drv_flags & IFF_DRV_OACTIVE) != 0) {
302 /* Our "hw"q overflew again. */
303 epair_dpcpu->epair_drv_flags |= IFF_DRV_OACTIVE
304 DPRINTF("hw queue length overflow at %u\n",
309 EPAIR_UNLOCK(epair_dpcpu);
313 * Network interface (`if') related functions.
316 epair_add_ifp_for_draining(struct ifnet *ifp)
318 struct epair_dpcpu *epair_dpcpu;
319 struct epair_softc *sc = sc = ifp->if_softc;
320 struct epair_ifp_drain *elm = NULL;
322 epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
323 STAILQ_FOREACH(elm, &epair_dpcpu->epair_ifp_drain_list, ifp_next)
326 /* If the ipf is there already, return success. */
330 elm = malloc(sizeof(struct epair_ifp_drain), M_EPAIR, M_NOWAIT|M_ZERO);
335 STAILQ_INSERT_TAIL(&epair_dpcpu->epair_ifp_drain_list, elm, ifp_next);
341 epair_start_locked(struct ifnet *ifp)
343 struct epair_dpcpu *epair_dpcpu;
345 struct epair_softc *sc;
349 DPRINTF("ifp=%p\n", ifp);
351 epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
352 EPAIR_LOCK_ASSERT(epair_dpcpu);
354 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0)
356 if ((ifp->if_flags & IFF_UP) == 0)
360 * We get patckets here from ether_output via if_handoff()
361 * and ned to put them into the input queue of the oifp
362 * and call oifp->if_input() via netisr/epair_sintr().
367 IFQ_DEQUEUE(&ifp->if_snd, m);
373 * In case the outgoing interface is not usable,
376 if ((oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
377 (oifp->if_flags & IFF_UP) ==0) {
382 DPRINTF("packet %s -> %s\n", ifp->if_xname, oifp->if_xname);
385 * Add a reference so the interface cannot go while the
386 * packet is in transit as we rely on rcvif to stay valid.
388 EPAIR_REFCOUNT_AQUIRE(&sc->refcount);
389 m->m_pkthdr.rcvif = oifp;
390 CURVNET_SET_QUIET(oifp->if_vnet);
391 error = netisr_queue(NETISR_EPAIR, m);
395 /* Someone else received the packet. */
398 epair_dpcpu->epair_drv_flags |= IFF_DRV_OACTIVE;
399 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
400 if (epair_add_ifp_for_draining(ifp)) {
404 EPAIR_REFCOUNT_RELEASE(&sc->refcount);
410 epair_start(struct ifnet *ifp)
412 struct epair_dpcpu *epair_dpcpu;
414 epair_dpcpu = DPCPU_ID_PTR(cpuid_from_ifp(ifp), epair_dpcpu);
415 EPAIR_LOCK(epair_dpcpu);
416 epair_start_locked(ifp);
417 EPAIR_UNLOCK(epair_dpcpu);
421 epair_transmit_locked(struct ifnet *ifp, struct mbuf *m)
423 struct epair_dpcpu *epair_dpcpu;
424 struct epair_softc *sc;
429 DPRINTF("ifp=%p m=%p\n", ifp, m);
431 epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
432 EPAIR_LOCK_ASSERT(epair_dpcpu);
438 * We are not going to use the interface en/dequeue mechanism
439 * on the TX side. We are called from ether_output_frame()
440 * and will put the packet into the incoming queue of the
441 * other interface of our pair via the netsir.
443 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
447 if ((ifp->if_flags & IFF_UP) == 0) {
455 * In case the outgoing interface is not usable,
459 if ((oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
460 (oifp->if_flags & IFF_UP) ==0) {
465 len = m->m_pkthdr.len;
467 DPRINTF("packet %s -> %s\n", ifp->if_xname, oifp->if_xname);
470 /* Support ALTQ via the clasic if_start() path. */
471 IF_LOCK(&ifp->if_snd);
472 if (ALTQ_IS_ENABLED(&ifp->if_snd)) {
473 ALTQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
475 ifp->if_snd.ifq_drops++;
476 IF_UNLOCK(&ifp->if_snd);
478 ifp->if_obytes += len;
479 if (mflags & (M_BCAST|M_MCAST))
482 if ((ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0)
483 epair_start_locked(ifp);
485 (void)epair_add_ifp_for_draining(ifp);
489 IF_UNLOCK(&ifp->if_snd);
492 if ((epair_dpcpu->epair_drv_flags & IFF_DRV_OACTIVE) != 0) {
494 * Our hardware queue is full, try to fall back
495 * queuing to the ifq but do not call ifp->if_start.
496 * Either we are lucky or the packet is gone.
498 IFQ_ENQUEUE(&ifp->if_snd, m, error);
500 (void)epair_add_ifp_for_draining(ifp);
505 * Add a reference so the interface cannot go while the
506 * packet is in transit as we rely on rcvif to stay valid.
508 EPAIR_REFCOUNT_AQUIRE(&sc->refcount);
509 m->m_pkthdr.rcvif = oifp;
510 CURVNET_SET_QUIET(oifp->if_vnet);
511 error = netisr_queue(NETISR_EPAIR, m);
516 * IFQ_HANDOFF_ADJ/ip_handoff() update statistics,
517 * but as we bypass all this we have to duplicate
518 * the logic another time.
520 ifp->if_obytes += len;
521 if (mflags & (M_BCAST|M_MCAST))
523 /* Someone else received the packet. */
526 /* The packet was freed already. */
527 EPAIR_REFCOUNT_RELEASE(&sc->refcount);
528 epair_dpcpu->epair_drv_flags |= IFF_DRV_OACTIVE;
529 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
536 epair_transmit(struct ifnet *ifp, struct mbuf *m)
538 struct epair_dpcpu *epair_dpcpu;
541 epair_dpcpu = DPCPU_ID_PTR(cpuid_from_ifp(ifp), epair_dpcpu);
542 EPAIR_LOCK(epair_dpcpu);
543 error = epair_transmit_locked(ifp, m);
544 EPAIR_UNLOCK(epair_dpcpu);
549 epair_qflush(struct ifnet *ifp)
551 struct epair_dpcpu *epair_dpcpu;
552 struct epair_softc *sc;
556 epair_dpcpu = DPCPU_ID_PTR(sc->cpuid, epair_dpcpu);
557 EPAIR_LOCK(epair_dpcpu);
559 DPRINTF("ifp=%p sc refcnt=%u ifq_len=%u\n",
560 ifp, sc->refcount, ifq->ifq_len);
562 * Instead of calling EPAIR_REFCOUNT_RELEASE(&sc->refcount);
563 * n times, just subtract for the cleanup.
565 sc->refcount -= ifq->ifq_len;
566 EPAIR_UNLOCK(epair_dpcpu);
572 epair_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
577 ifr = (struct ifreq *)data;
586 /* We basically allow all kinds of MTUs. */
587 ifp->if_mtu = ifr->ifr_mtu;
592 /* Let the common ethernet handler process this. */
593 error = ether_ioctl(ifp, cmd, data);
601 epair_init(void *dummy __unused)
607 * Interface cloning functions.
608 * We use our private ones so that we can create/destroy our secondary
609 * device along with the primary one.
612 epair_clone_match(struct if_clone *ifc, const char *name)
616 DPRINTF("name='%s'\n", name);
619 * Our base name is epair.
620 * Our interfaces will be named epair<n>[ab].
621 * So accept anything of the following list:
624 * but not the epair<n>[ab] versions.
626 if (strncmp(EPAIRNAME, name, sizeof(EPAIRNAME)-1) != 0)
629 for (cp = name + sizeof(EPAIRNAME) - 1; *cp != '\0'; cp++) {
630 if (*cp < '0' || *cp > '9')
638 epair_clone_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
640 struct epair_softc *sca, *scb;
643 int error, unit, wildcard;
644 uint8_t eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
647 * We are abusing params to create our second interface.
648 * Actually we already created it and called if_clone_createif()
649 * for it to do the official insertion procedure the moment we knew
650 * it cannot fail anymore. So just do attach it here.
653 scb = (struct epair_softc *)params;
655 /* Assign a hopefully unique, locally administered etheraddr. */
657 eaddr[3] = (ifp->if_index >> 8) & 0xff;
658 eaddr[4] = ifp->if_index & 0xff;
660 ether_ifattach(ifp, eaddr);
661 /* Correctly set the name for the cloner list. */
662 strlcpy(name, scb->ifp->if_xname, len);
666 /* Try to see if a special unit was requested. */
667 error = ifc_name2unit(name, &unit);
670 wildcard = (unit < 0);
672 error = ifc_alloc_unit(ifc, &unit);
677 * If no unit had been given, we need to adjust the ifName.
678 * Also make sure there is space for our extra [ab] suffix.
680 for (dp = name; *dp != '\0'; dp++);
682 error = snprintf(dp, len - (dp - name), "%d", unit);
683 if (error > len - (dp - name) - 1) {
684 /* ifName too long. */
685 ifc_free_unit(ifc, unit);
690 if (len - (dp - name) - 1 < 1) {
691 /* No space left for our [ab] suffix. */
692 ifc_free_unit(ifc, unit);
696 /* Must not change dp so we can replace 'a' by 'b' later. */
699 /* Allocate memory for both [ab] interfaces */
700 sca = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
701 EPAIR_REFCOUNT_INIT(&sca->refcount, 1);
702 sca->ifp = if_alloc(IFT_ETHER);
703 if (sca->ifp == NULL) {
705 ifc_free_unit(ifc, unit);
709 scb = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
710 EPAIR_REFCOUNT_INIT(&scb->refcount, 1);
711 scb->ifp = if_alloc(IFT_ETHER);
712 if (scb->ifp == NULL) {
716 ifc_free_unit(ifc, unit);
721 * Cross-reference the interfaces so we will be able to free both.
723 sca->oifp = scb->ifp;
724 scb->oifp = sca->ifp;
727 * Calculate the cpuid for netisr queueing based on the
728 * ifIndex of the interfaces. As long as we cannot configure
729 * this or use cpuset information easily we cannot guarantee
730 * cache locality but we can at least allow parallelism.
733 netisr_get_cpuid(sca->ifp->if_index % netisr_get_cpucount());
735 netisr_get_cpuid(scb->ifp->if_index % netisr_get_cpucount());
737 /* Finish initialization of interface <n>a. */
740 strlcpy(ifp->if_xname, name, IFNAMSIZ);
741 ifp->if_dname = ifc->ifc_name;
742 ifp->if_dunit = unit;
743 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
744 ifp->if_start = epair_start;
745 ifp->if_ioctl = epair_ioctl;
746 ifp->if_init = epair_init;
747 ifp->if_snd.ifq_maxlen = ifqmaxlen;
748 /* Assign a hopefully unique, locally administered etheraddr. */
750 eaddr[3] = (ifp->if_index >> 8) & 0xff;
751 eaddr[4] = ifp->if_index & 0xff;
753 ether_ifattach(ifp, eaddr);
754 sca->if_qflush = ifp->if_qflush;
755 ifp->if_qflush = epair_qflush;
756 ifp->if_transmit = epair_transmit;
757 ifp->if_baudrate = IF_Gbps(10UL); /* arbitrary maximum */
759 /* Swap the name and finish initialization of interface <n>b. */
764 strlcpy(ifp->if_xname, name, IFNAMSIZ);
765 ifp->if_dname = ifc->ifc_name;
766 ifp->if_dunit = unit;
767 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
768 ifp->if_start = epair_start;
769 ifp->if_ioctl = epair_ioctl;
770 ifp->if_init = epair_init;
771 ifp->if_snd.ifq_maxlen = ifqmaxlen;
772 /* We need to play some tricks here for the second interface. */
773 strlcpy(name, EPAIRNAME, len);
774 error = if_clone_create(name, len, (caddr_t)scb);
776 panic("%s: if_clone_createif() for our 2nd iface failed: %d",
778 scb->if_qflush = ifp->if_qflush;
779 ifp->if_qflush = epair_qflush;
780 ifp->if_transmit = epair_transmit;
781 ifp->if_baudrate = IF_Gbps(10UL); /* arbitrary maximum */
784 * Restore name to <n>a as the ifp for this will go into the
785 * cloner list for the initial call.
787 strlcpy(name, sca->ifp->if_xname, len);
788 DPRINTF("name='%s/%db' created sca=%p scb=%p\n", name, unit, sca, scb);
790 /* Tell the world, that we are ready to rock. */
791 sca->ifp->if_drv_flags |= IFF_DRV_RUNNING;
792 scb->ifp->if_drv_flags |= IFF_DRV_RUNNING;
798 epair_clone_destroy(struct if_clone *ifc, struct ifnet *ifp)
801 struct epair_softc *sca, *scb;
804 DPRINTF("ifp=%p\n", ifp);
807 * In case we called into if_clone_destroyif() ourselves
808 * again to remove the second interface, the softc will be
809 * NULL. In that case so not do anything but return success.
811 if (ifp->if_softc == NULL)
814 unit = ifp->if_dunit;
817 scb = oifp->if_softc;
819 DPRINTF("ifp=%p oifp=%p\n", ifp, oifp);
820 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
821 oifp->if_drv_flags &= ~IFF_DRV_RUNNING;
822 ether_ifdetach(oifp);
825 * Wait for all packets to be dispatched to if_input.
826 * The numbers can only go down as the interfaces are
827 * detached so there is no need to use atomics.
829 DPRINTF("sca refcnt=%u scb refcnt=%u\n", sca->refcount, scb->refcount);
830 EPAIR_REFCOUNT_ASSERT(sca->refcount == 1 && scb->refcount == 1,
831 ("%s: sca->refcount!=1: %d || scb->refcount!=1: %d",
832 __func__, sca->refcount, scb->refcount));
835 * Get rid of our second half.
837 oifp->if_softc = NULL;
838 error = if_clone_destroyif(ifc, oifp);
840 panic("%s: if_clone_destroyif() for our 2nd iface failed: %d",
844 * Finish cleaning up. Free them and release the unit.
845 * As the other of the two interfaces my reside in a different vnet,
846 * we need to switch before freeing them.
848 CURVNET_SET_QUIET(oifp->if_vnet);
849 if_free_type(oifp, IFT_ETHER);
851 if_free_type(ifp, IFT_ETHER);
854 ifc_free_unit(ifc, unit);
860 epair_modevent(module_t mod, int type, void *data)
866 /* For now limit us to one global mutex and one inq. */
868 epair_nh.nh_qlimit = 42 * ifqmaxlen; /* 42 shall be the number. */
869 if (TUNABLE_INT_FETCH("net.link.epair.netisr_maxqlen", &qlimit))
870 epair_nh.nh_qlimit = qlimit;
871 netisr_register(&epair_nh);
872 if_clone_attach(&epair_cloner);
874 printf("%s initialized.\n", EPAIRNAME);
877 if_clone_detach(&epair_cloner);
878 netisr_unregister(&epair_nh);
879 epair_dpcpu_detach();
881 printf("%s unloaded.\n", EPAIRNAME);
889 static moduledata_t epair_mod = {
895 DECLARE_MODULE(if_epair, epair_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
896 MODULE_VERSION(if_epair, 1);