/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* 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 NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/linker_set.h>
#include <sys/select.h>
#include <sys/uio.h>
#include <sys/ioctl.h>
#include <machine/vmm_snapshot.h>
#include <net/ethernet.h>
#include <net/if.h> /* IFNAMSIZ */
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <assert.h>
#include <pthread.h>
#include <pthread_np.h>
#include "bhyverun.h"
#include "config.h"
#include "debug.h"
#include "pci_emul.h"
#include "mevent.h"
#include "virtio.h"
#include "net_utils.h"
#include "net_backends.h"
#include "iov.h"
#define VTNET_RINGSZ 1024
#define VTNET_MAXSEGS 256
#define VTNET_MAX_PKT_LEN (65536 + 64)
#define VTNET_MIN_MTU ETHERMIN
#define VTNET_MAX_MTU 65535
#define VTNET_S_HOSTCAPS \
( VIRTIO_NET_F_MAC | VIRTIO_NET_F_STATUS | \
VIRTIO_F_NOTIFY_ON_EMPTY | VIRTIO_RING_F_INDIRECT_DESC)
/*
* PCI config-space "registers"
*/
struct virtio_net_config {
uint8_t mac[6];
uint16_t status;
uint16_t max_virtqueue_pairs;
uint16_t mtu;
} __packed;
/*
* Queue definitions.
*/
#define VTNET_RXQ 0
#define VTNET_TXQ 1
#define VTNET_CTLQ 2 /* NB: not yet supported */
#define VTNET_MAXQ 3
/*
* Debug printf
*/
static int pci_vtnet_debug;
#define DPRINTF(params) if (pci_vtnet_debug) PRINTLN params
#define WPRINTF(params) PRINTLN params
/*
* Per-device softc
*/
struct pci_vtnet_softc {
struct virtio_softc vsc_vs;
struct vqueue_info vsc_queues[VTNET_MAXQ - 1];
pthread_mutex_t vsc_mtx;
net_backend_t *vsc_be;
bool features_negotiated; /* protected by rx_mtx */
int resetting; /* protected by tx_mtx */
uint64_t vsc_features; /* negotiated features */
pthread_mutex_t rx_mtx;
int rx_merge; /* merged rx bufs in use */
pthread_t tx_tid;
pthread_mutex_t tx_mtx;
pthread_cond_t tx_cond;
int tx_in_progress;
size_t vhdrlen;
size_t be_vhdrlen;
struct virtio_net_config vsc_config;
struct virtio_consts vsc_consts;
};
static void pci_vtnet_reset(void *);
/* static void pci_vtnet_notify(void *, struct vqueue_info *); */
static int pci_vtnet_cfgread(void *, int, int, uint32_t *);
static int pci_vtnet_cfgwrite(void *, int, int, uint32_t);
static void pci_vtnet_neg_features(void *, uint64_t);
#ifdef BHYVE_SNAPSHOT
static void pci_vtnet_pause(void *);
static void pci_vtnet_resume(void *);
static int pci_vtnet_snapshot(void *, struct vm_snapshot_meta *);
#endif
static struct virtio_consts vtnet_vi_consts = {
.vc_name = "vtnet",
.vc_nvq = VTNET_MAXQ - 1,
.vc_cfgsize = sizeof(struct virtio_net_config),
.vc_reset = pci_vtnet_reset,
.vc_cfgread = pci_vtnet_cfgread,
.vc_cfgwrite = pci_vtnet_cfgwrite,
.vc_apply_features = pci_vtnet_neg_features,
.vc_hv_caps = VTNET_S_HOSTCAPS,
#ifdef BHYVE_SNAPSHOT
.vc_pause = pci_vtnet_pause,
.vc_resume = pci_vtnet_resume,
.vc_snapshot = pci_vtnet_snapshot,
#endif
};
static void
pci_vtnet_reset(void *vsc)
{
struct pci_vtnet_softc *sc = vsc;
DPRINTF(("vtnet: device reset requested !"));
/* Acquire the RX lock to block RX processing. */
pthread_mutex_lock(&sc->rx_mtx);
/*
* Make sure receive operation is disabled at least until we
* re-negotiate the features, since receive operation depends
* on the value of sc->rx_merge and the header length, which
* are both set in pci_vtnet_neg_features().
* Receive operation will be enabled again once the guest adds
* the first receive buffers and kicks us.
*/
sc->features_negotiated = false;
netbe_rx_disable(sc->vsc_be);
/* Set sc->resetting and give a chance to the TX thread to stop. */
pthread_mutex_lock(&sc->tx_mtx);
sc->resetting = 1;
while (sc->tx_in_progress) {
pthread_mutex_unlock(&sc->tx_mtx);
usleep(10000);
pthread_mutex_lock(&sc->tx_mtx);
}
/*
* Now reset rings, MSI-X vectors, and negotiated capabilities.
* Do that with the TX lock held, since we need to reset
* sc->resetting.
*/
vi_reset_dev(&sc->vsc_vs);
sc->resetting = 0;
pthread_mutex_unlock(&sc->tx_mtx);
pthread_mutex_unlock(&sc->rx_mtx);
}
static __inline struct iovec *
iov_trim_hdr(struct iovec *iov, int *iovcnt, unsigned int hlen)
{
struct iovec *riov;
if (iov[0].iov_len < hlen) {
/*
* Not enough header space in the first fragment.
* That's not ok for us.
*/
return NULL;
}
iov[0].iov_len -= hlen;
if (iov[0].iov_len == 0) {
*iovcnt -= 1;
if (*iovcnt == 0) {
/*
* Only space for the header. That's not
* enough for us.
*/
return NULL;
}
riov = &iov[1];
} else {
iov[0].iov_base = (void *)((uintptr_t)iov[0].iov_base + hlen);
riov = &iov[0];
}
return (riov);
}
struct virtio_mrg_rxbuf_info {
uint16_t idx;
uint16_t pad;
uint32_t len;
};
static void
pci_vtnet_rx(struct pci_vtnet_softc *sc)
{
int prepend_hdr_len = sc->vhdrlen - sc->be_vhdrlen;
struct virtio_mrg_rxbuf_info info[VTNET_MAXSEGS];
struct iovec iov[VTNET_MAXSEGS + 1];
struct vqueue_info *vq;
struct vi_req req;
vq = &sc->vsc_queues[VTNET_RXQ];
/* Features must be negotiated */
if (!sc->features_negotiated) {
return;
}
for (;;) {
struct virtio_net_rxhdr *hdr;
uint32_t riov_bytes;
struct iovec *riov;
uint32_t ulen;
int riov_len;
int n_chains;
ssize_t rlen;
ssize_t plen;
plen = netbe_peek_recvlen(sc->vsc_be);
if (plen <= 0) {
/*
* No more packets (plen == 0), or backend errored
* (plen < 0). Interrupt if needed and stop.
*/
vq_endchains(vq, /*used_all_avail=*/0);
return;
}
plen += prepend_hdr_len;
/*
* Get a descriptor chain to store the next ingress
* packet. In case of mergeable rx buffers, get as
* many chains as necessary in order to make room
* for plen bytes.
*/
riov_bytes = 0;
riov_len = 0;
riov = iov;
n_chains = 0;
do {
int n = vq_getchain(vq, riov, VTNET_MAXSEGS - riov_len,
&req);
info[n_chains].idx = req.idx;
if (n == 0) {
/*
* No rx buffers. Enable RX kicks and double
* check.
*/
vq_kick_enable(vq);
if (!vq_has_descs(vq)) {
/*
* Still no buffers. Return the unused
* chains (if any), interrupt if needed
* (including for NOTIFY_ON_EMPTY), and
* disable the backend until the next
* kick.
*/
vq_retchains(vq, n_chains);
vq_endchains(vq, /*used_all_avail=*/1);
netbe_rx_disable(sc->vsc_be);
return;
}
/* More rx buffers found, so keep going. */
vq_kick_disable(vq);
continue;
}
assert(n >= 1 && riov_len + n <= VTNET_MAXSEGS);
riov_len += n;
if (!sc->rx_merge) {
n_chains = 1;
break;
}
info[n_chains].len = (uint32_t)count_iov(riov, n);
riov_bytes += info[n_chains].len;
riov += n;
n_chains++;
} while (riov_bytes < plen && riov_len < VTNET_MAXSEGS);
riov = iov;
hdr = riov[0].iov_base;
if (prepend_hdr_len > 0) {
/*
* The frontend uses a virtio-net header, but the
* backend does not. We need to prepend a zeroed
* header.
*/
riov = iov_trim_hdr(riov, &riov_len, prepend_hdr_len);
if (riov == NULL) {
/*
* The first collected chain is nonsensical,
* as it is not even enough to store the
* virtio-net header. Just drop it.
*/
vq_relchain(vq, info[0].idx, 0);
vq_retchains(vq, n_chains - 1);
continue;
}
memset(hdr, 0, prepend_hdr_len);
}
rlen = netbe_recv(sc->vsc_be, riov, riov_len);
if (rlen != plen - prepend_hdr_len) {
/*
* If this happens it means there is something
* wrong with the backend (e.g., some other
* process is stealing our packets).
*/
WPRINTF(("netbe_recv: expected %zd bytes, "
"got %zd", plen - prepend_hdr_len, rlen));
vq_retchains(vq, n_chains);
continue;
}
ulen = (uint32_t)plen;
/*
* Publish the used buffers to the guest, reporting the
* number of bytes that we wrote.
*/
if (!sc->rx_merge) {
vq_relchain(vq, info[0].idx, ulen);
} else {
uint32_t iolen;
int i = 0;
do {
iolen = info[i].len;
if (iolen > ulen) {
iolen = ulen;
}
vq_relchain_prepare(vq, info[i].idx, iolen);
ulen -= iolen;
i++;
} while (ulen > 0);
hdr->vrh_bufs = i;
vq_relchain_publish(vq);
assert(i == n_chains);
}
}
}
/*
* Called when there is read activity on the backend file descriptor.
* Each buffer posted by the guest is assumed to be able to contain
* an entire ethernet frame + rx header.
*/
static void
pci_vtnet_rx_callback(int fd __unused, enum ev_type type __unused, void *param)
{
struct pci_vtnet_softc *sc = param;
pthread_mutex_lock(&sc->rx_mtx);
pci_vtnet_rx(sc);
pthread_mutex_unlock(&sc->rx_mtx);
}
/* Called on RX kick. */
static void
pci_vtnet_ping_rxq(void *vsc, struct vqueue_info *vq)
{
struct pci_vtnet_softc *sc = vsc;
/*
* A qnotify means that the rx process can now begin.
* Enable RX only if features are negotiated.
*/
pthread_mutex_lock(&sc->rx_mtx);
if (!sc->features_negotiated) {
pthread_mutex_unlock(&sc->rx_mtx);
return;
}
vq_kick_disable(vq);
netbe_rx_enable(sc->vsc_be);
pthread_mutex_unlock(&sc->rx_mtx);
}
/* TX virtqueue processing, called by the TX thread. */
static void
pci_vtnet_proctx(struct pci_vtnet_softc *sc, struct vqueue_info *vq)
{
struct iovec iov[VTNET_MAXSEGS + 1];
struct iovec *siov = iov;
struct vi_req req;
ssize_t len;
int n;
/*
* Obtain chain of descriptors. The first descriptor also
* contains the virtio-net header.
*/
n = vq_getchain(vq, iov, VTNET_MAXSEGS, &req);
assert(n >= 1 && n <= VTNET_MAXSEGS);
if (sc->vhdrlen != sc->be_vhdrlen) {
/*
* The frontend uses a virtio-net header, but the backend
* does not. We simply strip the header and ignore it, as
* it should be zero-filled.
*/
siov = iov_trim_hdr(siov, &n, sc->vhdrlen);
}
if (siov == NULL) {
/* The chain is nonsensical. Just drop it. */
len = 0;
} else {
len = netbe_send(sc->vsc_be, siov, n);
if (len < 0) {
/*
* If send failed, report that 0 bytes
* were read.
*/
len = 0;
}
}
/*
* Return the processed chain to the guest, reporting
* the number of bytes that we read.
*/
vq_relchain(vq, req.idx, len);
}
/* Called on TX kick. */
static void
pci_vtnet_ping_txq(void *vsc, struct vqueue_info *vq)
{
struct pci_vtnet_softc *sc = vsc;
/*
* Any ring entries to process?
*/
if (!vq_has_descs(vq))
return;
/* Signal the tx thread for processing */
pthread_mutex_lock(&sc->tx_mtx);
vq_kick_disable(vq);
if (sc->tx_in_progress == 0)
pthread_cond_signal(&sc->tx_cond);
pthread_mutex_unlock(&sc->tx_mtx);
}
/*
* Thread which will handle processing of TX desc
*/
static void *
pci_vtnet_tx_thread(void *param)
{
struct pci_vtnet_softc *sc = param;
struct vqueue_info *vq;
int error;
vq = &sc->vsc_queues[VTNET_TXQ];
/*
* Let us wait till the tx queue pointers get initialised &
* first tx signaled
*/
pthread_mutex_lock(&sc->tx_mtx);
error = pthread_cond_wait(&sc->tx_cond, &sc->tx_mtx);
assert(error == 0);
for (;;) {
/* note - tx mutex is locked here */
while (sc->resetting || !vq_has_descs(vq)) {
vq_kick_enable(vq);
if (!sc->resetting && vq_has_descs(vq))
break;
sc->tx_in_progress = 0;
error = pthread_cond_wait(&sc->tx_cond, &sc->tx_mtx);
assert(error == 0);
}
vq_kick_disable(vq);
sc->tx_in_progress = 1;
pthread_mutex_unlock(&sc->tx_mtx);
do {
/*
* Run through entries, placing them into
* iovecs and sending when an end-of-packet
* is found
*/
pci_vtnet_proctx(sc, vq);
} while (vq_has_descs(vq));
/*
* Generate an interrupt if needed.
*/
vq_endchains(vq, /*used_all_avail=*/1);
pthread_mutex_lock(&sc->tx_mtx);
}
}
#ifdef notyet
static void
pci_vtnet_ping_ctlq(void *vsc, struct vqueue_info *vq)
{
DPRINTF(("vtnet: control qnotify!"));
}
#endif
static int
pci_vtnet_init(struct pci_devinst *pi, nvlist_t *nvl)
{
struct pci_vtnet_softc *sc;
const char *value;
char tname[MAXCOMLEN + 1];
unsigned long mtu = ETHERMTU;
int err;
/*
* Allocate data structures for further virtio initializations.
* sc also contains a copy of vtnet_vi_consts, since capabilities
* change depending on the backend.
*/
sc = calloc(1, sizeof(struct pci_vtnet_softc));
sc->vsc_consts = vtnet_vi_consts;
pthread_mutex_init(&sc->vsc_mtx, NULL);
sc->vsc_queues[VTNET_RXQ].vq_qsize = VTNET_RINGSZ;
sc->vsc_queues[VTNET_RXQ].vq_notify = pci_vtnet_ping_rxq;
sc->vsc_queues[VTNET_TXQ].vq_qsize = VTNET_RINGSZ;
sc->vsc_queues[VTNET_TXQ].vq_notify = pci_vtnet_ping_txq;
#ifdef notyet
sc->vsc_queues[VTNET_CTLQ].vq_qsize = VTNET_RINGSZ;
sc->vsc_queues[VTNET_CTLQ].vq_notify = pci_vtnet_ping_ctlq;
#endif
value = get_config_value_node(nvl, "mac");
if (value != NULL) {
err = net_parsemac(value, sc->vsc_config.mac);
if (err) {
free(sc);
return (err);
}
} else
net_genmac(pi, sc->vsc_config.mac);
value = get_config_value_node(nvl, "mtu");
if (value != NULL) {
err = net_parsemtu(value, &mtu);
if (err) {
free(sc);
return (err);
}
if (mtu < VTNET_MIN_MTU || mtu > VTNET_MAX_MTU) {
err = EINVAL;
errno = EINVAL;
free(sc);
return (err);
}
sc->vsc_consts.vc_hv_caps |= VIRTIO_NET_F_MTU;
}
sc->vsc_config.mtu = mtu;
/* Permit interfaces without a configured backend. */
if (get_config_value_node(nvl, "backend") != NULL) {
err = netbe_init(&sc->vsc_be, nvl, pci_vtnet_rx_callback, sc);
if (err) {
free(sc);
return (err);
}
}
sc->vsc_consts.vc_hv_caps |= VIRTIO_NET_F_MRG_RXBUF |
netbe_get_cap(sc->vsc_be);
/*
* Since we do not actually support multiqueue,
* set the maximum virtqueue pairs to 1.
*/
sc->vsc_config.max_virtqueue_pairs = 1;
/* initialize config space */
pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_NET);
pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_NETWORK);
pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_ID_NETWORK);
pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR);
/* Link is always up. */
sc->vsc_config.status = 1;
vi_softc_linkup(&sc->vsc_vs, &sc->vsc_consts, sc, pi, sc->vsc_queues);
sc->vsc_vs.vs_mtx = &sc->vsc_mtx;
/* use BAR 1 to map MSI-X table and PBA, if we're using MSI-X */
if (vi_intr_init(&sc->vsc_vs, 1, fbsdrun_virtio_msix())) {
free(sc);
return (1);
}
/* use BAR 0 to map config regs in IO space */
vi_set_io_bar(&sc->vsc_vs, 0);
sc->resetting = 0;
sc->rx_merge = 0;
sc->vhdrlen = sizeof(struct virtio_net_rxhdr) - 2;
pthread_mutex_init(&sc->rx_mtx, NULL);
/*
* Initialize tx semaphore & spawn TX processing thread.
* As of now, only one thread for TX desc processing is
* spawned.
*/
sc->tx_in_progress = 0;
pthread_mutex_init(&sc->tx_mtx, NULL);
pthread_cond_init(&sc->tx_cond, NULL);
pthread_create(&sc->tx_tid, NULL, pci_vtnet_tx_thread, (void *)sc);
snprintf(tname, sizeof(tname), "vtnet-%d:%d tx", pi->pi_slot,
pi->pi_func);
pthread_set_name_np(sc->tx_tid, tname);
return (0);
}
static int
pci_vtnet_cfgwrite(void *vsc, int offset, int size, uint32_t value)
{
struct pci_vtnet_softc *sc = vsc;
void *ptr;
if (offset < (int)sizeof(sc->vsc_config.mac)) {
assert(offset + size <= (int)sizeof(sc->vsc_config.mac));
/*
* The driver is allowed to change the MAC address
*/
ptr = &sc->vsc_config.mac[offset];
memcpy(ptr, &value, size);
} else {
/* silently ignore other writes */
DPRINTF(("vtnet: write to readonly reg %d", offset));
}
return (0);
}
static int
pci_vtnet_cfgread(void *vsc, int offset, int size, uint32_t *retval)
{
struct pci_vtnet_softc *sc = vsc;
void *ptr;
ptr = (uint8_t *)&sc->vsc_config + offset;
memcpy(retval, ptr, size);
return (0);
}
static void
pci_vtnet_neg_features(void *vsc, uint64_t negotiated_features)
{
struct pci_vtnet_softc *sc = vsc;
sc->vsc_features = negotiated_features;
if (negotiated_features & VIRTIO_NET_F_MRG_RXBUF) {
sc->vhdrlen = sizeof(struct virtio_net_rxhdr);
sc->rx_merge = 1;
} else {
/*
* Without mergeable rx buffers, virtio-net header is 2
* bytes shorter than sizeof(struct virtio_net_rxhdr).
*/
sc->vhdrlen = sizeof(struct virtio_net_rxhdr) - 2;
sc->rx_merge = 0;
}
/* Tell the backend to enable some capabilities it has advertised. */
netbe_set_cap(sc->vsc_be, negotiated_features, sc->vhdrlen);
sc->be_vhdrlen = netbe_get_vnet_hdr_len(sc->vsc_be);
assert(sc->be_vhdrlen == 0 || sc->be_vhdrlen == sc->vhdrlen);
pthread_mutex_lock(&sc->rx_mtx);
sc->features_negotiated = true;
pthread_mutex_unlock(&sc->rx_mtx);
}
#ifdef BHYVE_SNAPSHOT
static void
pci_vtnet_pause(void *vsc)
{
struct pci_vtnet_softc *sc = vsc;
DPRINTF(("vtnet: device pause requested !\n"));
/* Acquire the RX lock to block RX processing. */
pthread_mutex_lock(&sc->rx_mtx);
/* Wait for the transmit thread to finish its processing. */
pthread_mutex_lock(&sc->tx_mtx);
while (sc->tx_in_progress) {
pthread_mutex_unlock(&sc->tx_mtx);
usleep(10000);
pthread_mutex_lock(&sc->tx_mtx);
}
}
static void
pci_vtnet_resume(void *vsc)
{
struct pci_vtnet_softc *sc = vsc;
DPRINTF(("vtnet: device resume requested !\n"));
pthread_mutex_unlock(&sc->tx_mtx);
/* The RX lock should have been acquired in vtnet_pause. */
pthread_mutex_unlock(&sc->rx_mtx);
}
static int
pci_vtnet_snapshot(void *vsc, struct vm_snapshot_meta *meta)
{
int ret;
struct pci_vtnet_softc *sc = vsc;
DPRINTF(("vtnet: device snapshot requested !\n"));
/*
* Queues and consts should have been saved by the more generic
* vi_pci_snapshot function. We need to save only our features and
* config.
*/
SNAPSHOT_VAR_OR_LEAVE(sc->vsc_features, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->features_negotiated, meta, ret, done);
/* Force reapply negociated features at restore time */
if (meta->op == VM_SNAPSHOT_RESTORE &&
sc->features_negotiated) {
pci_vtnet_neg_features(sc, sc->vsc_features);
netbe_rx_enable(sc->vsc_be);
}
SNAPSHOT_VAR_OR_LEAVE(sc->vsc_config, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->rx_merge, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->vhdrlen, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->be_vhdrlen, meta, ret, done);
done:
return (ret);
}
#endif
static const struct pci_devemu pci_de_vnet = {
.pe_emu = "virtio-net",
.pe_init = pci_vtnet_init,
.pe_legacy_config = netbe_legacy_config,
.pe_barwrite = vi_pci_write,
.pe_barread = vi_pci_read,
#ifdef BHYVE_SNAPSHOT
.pe_snapshot = vi_pci_snapshot,
.pe_pause = vi_pci_pause,
.pe_resume = vi_pci_resume,
#endif
};
PCI_EMUL_SET(pci_de_vnet);