freebsd-dev/sys/net/if_epair.c
Justin Hibbits 2c2b37ad25 ifnet/API: Move struct ifnet definition to a <net/if_private.h>
Hide the ifnet structure definition, no user serviceable parts inside,
it's a netstack implementation detail.  Include it temporarily in
<net/if_var.h> until all drivers are updated to use the accessors
exclusively.

Reviewed by:	glebius
Sponsored by:	Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D38046
2023-01-24 14:36:30 -05:00

933 lines
21 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008 The FreeBSD Foundation
* Copyright (c) 2009-2021 Bjoern A. Zeeb <bz@FreeBSD.org>
*
* 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 back-to-back connected ethernet like interfaces
* (``two interfaces with a virtual cross-over cable'').
*
* This is mostly intended to be used to provide connectivity between
* different virtual network stack instances.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_rss.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/hash.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/libkern.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/taskqueue.h>
#include <sys/types.h>
#include <sys/buf_ring.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_clone.h>
#include <net/if_media.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_types.h>
#include <net/netisr.h>
#ifdef RSS
#include <net/rss_config.h>
#ifdef INET
#include <netinet/in_rss.h>
#endif
#ifdef INET6
#include <netinet6/in6_rss.h>
#endif
#endif
#include <net/vnet.h>
static const char epairname[] = "epair";
#define RXRSIZE 4096 /* Probably overkill by 4-8x. */
static MALLOC_DEFINE(M_EPAIR, epairname,
"Pair of virtual cross-over connected Ethernet-like interfaces");
VNET_DEFINE_STATIC(struct if_clone *, epair_cloner);
#define V_epair_cloner VNET(epair_cloner)
static unsigned int next_index = 0;
#define EPAIR_LOCK_INIT() mtx_init(&epair_n_index_mtx, "epairidx", \
NULL, MTX_DEF)
#define EPAIR_LOCK_DESTROY() mtx_destroy(&epair_n_index_mtx)
#define EPAIR_LOCK() mtx_lock(&epair_n_index_mtx)
#define EPAIR_UNLOCK() mtx_unlock(&epair_n_index_mtx)
#define BIT_QUEUE_TASK 0
#define BIT_MBUF_QUEUED 1
struct epair_softc;
struct epair_queue {
int id;
struct buf_ring *rxring[2];
volatile int ridx; /* 0 || 1 */
volatile long state; /* taskqueue coordination */
struct task tx_task;
struct epair_softc *sc;
};
static struct mtx epair_n_index_mtx;
struct epair_softc {
struct ifnet *ifp; /* This ifp. */
struct ifnet *oifp; /* other ifp of pair. */
int num_queues;
struct epair_queue *queues;
struct ifmedia media; /* Media config (fake). */
STAILQ_ENTRY(epair_softc) entry;
};
struct epair_tasks_t {
int tasks;
struct taskqueue *tq[MAXCPU];
};
static struct epair_tasks_t epair_tasks;
static void
epair_clear_mbuf(struct mbuf *m)
{
/* Remove any CSUM_SND_TAG as ether_input will barf. */
if (m->m_pkthdr.csum_flags & CSUM_SND_TAG) {
m_snd_tag_rele(m->m_pkthdr.snd_tag);
m->m_pkthdr.snd_tag = NULL;
m->m_pkthdr.csum_flags &= ~CSUM_SND_TAG;
}
m_tag_delete_nonpersistent(m);
}
static void
epair_if_input(struct epair_softc *sc, struct epair_queue *q, int ridx)
{
struct ifnet *ifp;
struct mbuf *m;
ifp = sc->ifp;
CURVNET_SET(ifp->if_vnet);
while (! buf_ring_empty(q->rxring[ridx])) {
m = buf_ring_dequeue_mc(q->rxring[ridx]);
if (m == NULL)
continue;
MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
(*ifp->if_input)(ifp, m);
}
CURVNET_RESTORE();
}
static void
epair_tx_start_deferred(void *arg, int pending)
{
struct epair_queue *q = (struct epair_queue *)arg;
struct epair_softc *sc = q->sc;
int ridx, nidx;
if_ref(sc->ifp);
ridx = atomic_load_int(&q->ridx);
do {
nidx = (ridx == 0) ? 1 : 0;
} while (!atomic_fcmpset_int(&q->ridx, &ridx, nidx));
epair_if_input(sc, q, ridx);
atomic_clear_long(&q->state, (1 << BIT_QUEUE_TASK));
if (atomic_testandclear_long(&q->state, BIT_MBUF_QUEUED))
taskqueue_enqueue(epair_tasks.tq[q->id], &q->tx_task);
if_rele(sc->ifp);
}
static struct epair_queue *
epair_select_queue(struct epair_softc *sc, struct mbuf *m)
{
uint32_t bucket;
#ifdef RSS
struct ether_header *eh;
int ret;
ret = rss_m2bucket(m, &bucket);
if (ret) {
/* Actually hash the packet. */
eh = mtod(m, struct ether_header *);
switch (ntohs(eh->ether_type)) {
#ifdef INET
case ETHERTYPE_IP:
rss_soft_m2cpuid_v4(m, 0, &bucket);
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
rss_soft_m2cpuid_v6(m, 0, &bucket);
break;
#endif
default:
bucket = 0;
break;
}
}
bucket %= sc->num_queues;
#else
bucket = 0;
#endif
return (&sc->queues[bucket]);
}
static void
epair_prepare_mbuf(struct mbuf *m, struct ifnet *src_ifp)
{
M_ASSERTPKTHDR(m);
epair_clear_mbuf(m);
if_setrcvif(m, src_ifp);
M_SETFIB(m, src_ifp->if_fib);
MPASS(m->m_nextpkt == NULL);
MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
}
static void
epair_menq(struct mbuf *m, struct epair_softc *osc)
{
struct ifnet *ifp, *oifp;
int len, ret;
int ridx;
short mflags;
/*
* I know this looks weird. We pass the "other sc" as we need that one
* and can get both ifps from it as well.
*/
oifp = osc->ifp;
ifp = osc->oifp;
epair_prepare_mbuf(m, oifp);
/* Save values as once the mbuf is queued, it's not ours anymore. */
len = m->m_pkthdr.len;
mflags = m->m_flags;
struct epair_queue *q = epair_select_queue(osc, m);
atomic_set_long(&q->state, (1 << BIT_MBUF_QUEUED));
ridx = atomic_load_int(&q->ridx);
ret = buf_ring_enqueue(q->rxring[ridx], m);
if (ret != 0) {
/* Ring is full. */
if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
m_freem(m);
return;
}
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
/*
* IFQ_HANDOFF_ADJ/ip_handoff() update statistics,
* but as we bypass all this we have to duplicate
* the logic another time.
*/
if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
if (mflags & (M_BCAST|M_MCAST))
if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
/* Someone else received the packet. */
if_inc_counter(oifp, IFCOUNTER_IPACKETS, 1);
if (!atomic_testandset_long(&q->state, BIT_QUEUE_TASK))
taskqueue_enqueue(epair_tasks.tq[q->id], &q->tx_task);
}
static void
epair_start(struct ifnet *ifp)
{
struct mbuf *m;
struct epair_softc *sc;
struct ifnet *oifp;
/*
* We get packets here from ether_output via if_handoff()
* and need to put them into the input queue of the oifp
* and will put the packet into the receive-queue (rxq) of the
* other interface (oifp) of our pair.
*/
sc = ifp->if_softc;
oifp = sc->oifp;
sc = oifp->if_softc;
for (;;) {
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
M_ASSERTPKTHDR(m);
BPF_MTAP(ifp, m);
/* In case either interface is not usable drop the packet. */
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
(ifp->if_flags & IFF_UP) == 0 ||
(oifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
(oifp->if_flags & IFF_UP) == 0) {
m_freem(m);
continue;
}
epair_menq(m, sc);
}
}
static int
epair_transmit(struct ifnet *ifp, struct mbuf *m)
{
struct epair_softc *sc;
struct ifnet *oifp;
#ifdef ALTQ
int len;
short mflags;
#endif
if (m == NULL)
return (0);
M_ASSERTPKTHDR(m);
/*
* 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 receive-queue (rxq) of the
* other interface (oifp) of our pair.
*/
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
m_freem(m);
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
return (ENXIO);
}
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
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) {
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
m_freem(m);
return (0);
}
#ifdef ALTQ
len = m->m_pkthdr.len;
mflags = m->m_flags;
int error = 0;
/* Support ALTQ via the classic 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)
if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1);
IF_UNLOCK(&ifp->if_snd);
if (!error) {
if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
if (mflags & (M_BCAST|M_MCAST))
if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
epair_start(ifp);
}
return (error);
}
IF_UNLOCK(&ifp->if_snd);
#endif
epair_menq(m, oifp->if_softc);
return (0);
}
static void
epair_qflush(struct ifnet *ifp __unused)
{
}
static int
epair_media_change(struct ifnet *ifp __unused)
{
/* Do nothing. */
return (0);
}
static void
epair_media_status(struct ifnet *ifp __unused, struct ifmediareq *imr)
{
imr->ifm_status = IFM_AVALID | IFM_ACTIVE;
imr->ifm_active = IFM_ETHER | IFM_10G_T | IFM_FDX;
}
static int
epair_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct epair_softc *sc;
struct ifreq *ifr;
int error;
ifr = (struct ifreq *)data;
switch (cmd) {
case SIOCSIFFLAGS:
case SIOCADDMULTI:
case SIOCDELMULTI:
error = 0;
break;
case SIOCSIFMEDIA:
case SIOCGIFMEDIA:
sc = ifp->if_softc;
error = ifmedia_ioctl(ifp, ifr, &sc->media, cmd);
break;
case SIOCSIFMTU:
/* We basically allow all kinds of MTUs. */
ifp->if_mtu = ifr->ifr_mtu;
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;
/*
* 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 void
epair_clone_add(struct if_clone *ifc, struct epair_softc *scb)
{
struct ifnet *ifp;
uint8_t eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
ifp = scb->ifp;
/* Copy epairNa etheraddr and change the last byte. */
memcpy(eaddr, scb->oifp->if_hw_addr, ETHER_ADDR_LEN);
eaddr[5] = 0x0b;
ether_ifattach(ifp, eaddr);
if_clone_addif(ifc, ifp);
}
static struct epair_softc *
epair_alloc_sc(struct if_clone *ifc)
{
struct epair_softc *sc;
struct ifnet *ifp = if_alloc(IFT_ETHER);
if (ifp == NULL)
return (NULL);
sc = malloc(sizeof(struct epair_softc), M_EPAIR, M_WAITOK | M_ZERO);
sc->ifp = ifp;
sc->num_queues = epair_tasks.tasks;
sc->queues = mallocarray(sc->num_queues, sizeof(struct epair_queue),
M_EPAIR, M_WAITOK);
for (int i = 0; i < sc->num_queues; i++) {
struct epair_queue *q = &sc->queues[i];
q->id = i;
q->rxring[0] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
q->rxring[1] = buf_ring_alloc(RXRSIZE, M_EPAIR, M_WAITOK, NULL);
q->ridx = 0;
q->state = 0;
q->sc = sc;
NET_TASK_INIT(&q->tx_task, 0, epair_tx_start_deferred, q);
}
/* Initialise pseudo media types. */
ifmedia_init(&sc->media, 0, epair_media_change, epair_media_status);
ifmedia_add(&sc->media, IFM_ETHER | IFM_10G_T, 0, NULL);
ifmedia_set(&sc->media, IFM_ETHER | IFM_10G_T);
return (sc);
}
static void
epair_setup_ifp(struct epair_softc *sc, char *name, int unit)
{
struct ifnet *ifp = sc->ifp;
ifp->if_softc = sc;
strlcpy(ifp->if_xname, name, IFNAMSIZ);
ifp->if_dname = epairname;
ifp->if_dunit = unit;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_flags |= IFF_KNOWSEPOCH;
ifp->if_capabilities = IFCAP_VLAN_MTU;
ifp->if_capenable = IFCAP_VLAN_MTU;
ifp->if_transmit = epair_transmit;
ifp->if_qflush = epair_qflush;
ifp->if_start = epair_start;
ifp->if_ioctl = epair_ioctl;
ifp->if_init = epair_init;
if_setsendqlen(ifp, ifqmaxlen);
if_setsendqready(ifp);
ifp->if_baudrate = IF_Gbps(10); /* arbitrary maximum */
}
static void
epair_generate_mac(struct epair_softc *sc, uint8_t *eaddr)
{
uint32_t key[3];
uint32_t hash;
uint64_t hostid;
EPAIR_LOCK();
#ifdef SMP
/* Get an approximate distribution. */
hash = next_index % mp_ncpus;
#else
hash = 0;
#endif
EPAIR_UNLOCK();
/*
* Calculate the etheraddr hashing the hostid and the
* interface index. The result would be hopefully unique.
* Note that the "a" component of an epair instance may get moved
* to a different VNET after creation. In that case its index
* will be freed and the index can get reused by new epair instance.
* Make sure we do not create same etheraddr again.
*/
getcredhostid(curthread->td_ucred, (unsigned long *)&hostid);
if (hostid == 0)
arc4rand(&hostid, sizeof(hostid), 0);
struct ifnet *ifp = sc->ifp;
EPAIR_LOCK();
if (ifp->if_index > next_index)
next_index = ifp->if_index;
else
next_index++;
key[0] = (uint32_t)next_index;
EPAIR_UNLOCK();
key[1] = (uint32_t)(hostid & 0xffffffff);
key[2] = (uint32_t)((hostid >> 32) & 0xfffffffff);
hash = jenkins_hash32(key, 3, 0);
eaddr[0] = 0x02;
memcpy(&eaddr[1], &hash, 4);
eaddr[5] = 0x0a;
}
static void
epair_free_sc(struct epair_softc *sc)
{
if (sc == NULL)
return;
if_free(sc->ifp);
ifmedia_removeall(&sc->media);
for (int i = 0; i < sc->num_queues; i++) {
struct epair_queue *q = &sc->queues[i];
buf_ring_free(q->rxring[0], M_EPAIR);
buf_ring_free(q->rxring[1], M_EPAIR);
}
free(sc->queues, M_EPAIR);
free(sc, M_EPAIR);
}
static void
epair_set_state(struct ifnet *ifp, bool running)
{
if (running) {
ifp->if_drv_flags |= IFF_DRV_RUNNING;
if_link_state_change(ifp, LINK_STATE_UP);
} else {
if_link_state_change(ifp, LINK_STATE_DOWN);
ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
}
}
static int
epair_handle_unit(struct if_clone *ifc, char *name, size_t len, int *punit)
{
int error = 0, unit, wildcard;
char *dp;
/* 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) {
int slen = snprintf(dp, len - (dp - name), "%d", unit);
if (slen > len - (dp - name) - 1) {
/* ifName too long. */
error = ENOSPC;
goto done;
}
dp += slen;
}
if (len - (dp - name) - 1 < 1) {
/* No space left for our [ab] suffix. */
error = ENOSPC;
goto done;
}
*dp = 'b';
/* Must not change dp so we can replace 'a' by 'b' later. */
*(dp+1) = '\0';
/* Check if 'a' and 'b' interfaces already exist. */
if (ifunit(name) != NULL) {
error = EEXIST;
goto done;
}
*dp = 'a';
if (ifunit(name) != NULL) {
error = EEXIST;
goto done;
}
*punit = unit;
done:
if (error != 0)
ifc_free_unit(ifc, unit);
return (error);
}
static int
epair_clone_create(struct if_clone *ifc, char *name, size_t len,
struct ifc_data *ifd, struct ifnet **ifpp)
{
struct epair_softc *sca, *scb;
struct ifnet *ifp;
char *dp;
int error, unit;
uint8_t eaddr[ETHER_ADDR_LEN]; /* 00:00:00:00:00:00 */
error = epair_handle_unit(ifc, name, len, &unit);
if (error != 0)
return (error);
/* Allocate memory for both [ab] interfaces */
sca = epair_alloc_sc(ifc);
scb = epair_alloc_sc(ifc);
if (sca == NULL || scb == NULL) {
epair_free_sc(sca);
epair_free_sc(scb);
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;
epair_setup_ifp(sca, name, unit);
epair_generate_mac(sca, eaddr);
ether_ifattach(ifp, eaddr);
/* Swap the name and finish initialization of interface <n>b. */
dp = name + strlen(name) - 1;
*dp = 'b';
epair_setup_ifp(scb, name, unit);
ifp = scb->ifp;
/* We need to play some tricks here for the second interface. */
strlcpy(name, epairname, len);
/* Correctly set the name for the cloner list. */
strlcpy(name, scb->ifp->if_xname, len);
epair_clone_add(ifc, scb);
/*
* 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);
/* Tell the world, that we are ready to rock. */
epair_set_state(sca->ifp, true);
epair_set_state(scb->ifp, true);
*ifpp = sca->ifp;
return (0);
}
static void
epair_drain_rings(struct epair_softc *sc)
{
int ridx;
struct mbuf *m;
for (ridx = 0; ridx < 2; ridx++) {
for (int i = 0; i < sc->num_queues; i++) {
struct epair_queue *q = &sc->queues[i];
do {
m = buf_ring_dequeue_sc(q->rxring[ridx]);
if (m == NULL)
break;
m_freem(m);
} while (1);
}
}
}
static int
epair_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
{
struct ifnet *oifp;
struct epair_softc *sca, *scb;
int unit, error;
/*
* 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;
/* Frist get the interfaces down and detached. */
epair_set_state(ifp, false);
epair_set_state(oifp, false);
ether_ifdetach(ifp);
ether_ifdetach(oifp);
/* Third free any queued packets and all the resources. */
CURVNET_SET_QUIET(oifp->if_vnet);
epair_drain_rings(scb);
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);
epair_free_sc(scb);
CURVNET_RESTORE();
epair_drain_rings(sca);
epair_free_sc(sca);
/* Last free the cloner unit. */
ifc_free_unit(ifc, unit);
return (0);
}
static void
vnet_epair_init(const void *unused __unused)
{
struct if_clone_addreq req = {
.match_f = epair_clone_match,
.create_f = epair_clone_create,
.destroy_f = epair_clone_destroy,
};
V_epair_cloner = ifc_attach_cloner(epairname, &req);
}
VNET_SYSINIT(vnet_epair_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
vnet_epair_init, NULL);
static void
vnet_epair_uninit(const void *unused __unused)
{
ifc_detach_cloner(V_epair_cloner);
}
VNET_SYSUNINIT(vnet_epair_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
vnet_epair_uninit, NULL);
static int
epair_mod_init(void)
{
char name[32];
epair_tasks.tasks = 0;
#ifdef RSS
int cpu;
CPU_FOREACH(cpu) {
cpuset_t cpu_mask;
/* Pin to this CPU so we get appropriate NUMA allocations. */
thread_lock(curthread);
sched_bind(curthread, cpu);
thread_unlock(curthread);
snprintf(name, sizeof(name), "epair_task_%d", cpu);
epair_tasks.tq[cpu] = taskqueue_create(name, M_WAITOK,
taskqueue_thread_enqueue,
&epair_tasks.tq[cpu]);
CPU_SETOF(cpu, &cpu_mask);
taskqueue_start_threads_cpuset(&epair_tasks.tq[cpu], 1, PI_NET,
&cpu_mask, "%s", name);
epair_tasks.tasks++;
}
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
#else
snprintf(name, sizeof(name), "epair_task");
epair_tasks.tq[0] = taskqueue_create(name, M_WAITOK,
taskqueue_thread_enqueue,
&epair_tasks.tq[0]);
taskqueue_start_threads(&epair_tasks.tq[0], 1, PI_NET, "%s", name);
epair_tasks.tasks = 1;
#endif
return (0);
}
static void
epair_mod_cleanup(void)
{
for (int i = 0; i < epair_tasks.tasks; i++) {
taskqueue_drain_all(epair_tasks.tq[i]);
taskqueue_free(epair_tasks.tq[i]);
}
}
static int
epair_modevent(module_t mod, int type, void *data)
{
int ret;
switch (type) {
case MOD_LOAD:
EPAIR_LOCK_INIT();
ret = epair_mod_init();
if (ret != 0)
return (ret);
if (bootverbose)
printf("%s: %s initialized.\n", __func__, epairname);
break;
case MOD_UNLOAD:
epair_mod_cleanup();
EPAIR_LOCK_DESTROY();
if (bootverbose)
printf("%s: %s unloaded.\n", __func__, 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_MIDDLE);
MODULE_VERSION(if_epair, 3);