2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2011 NetApp, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #ifndef WITHOUT_CAPSICUM
36 #include <sys/capsicum.h>
38 #include <sys/linker_set.h>
39 #include <sys/select.h>
41 #include <sys/ioctl.h>
42 #include <machine/atomic.h>
43 #include <net/ethernet.h>
44 #ifndef NETMAP_WITH_LIBS
45 #define NETMAP_WITH_LIBS
47 #include <net/netmap_user.h>
49 #ifndef WITHOUT_CAPSICUM
50 #include <capsicum_helpers.h>
64 #include <pthread_np.h>
72 #define VTNET_RINGSZ 1024
74 #define VTNET_MAXSEGS 256
77 * Host capabilities. Note that we only offer a few of these.
79 #define VIRTIO_NET_F_CSUM (1 << 0) /* host handles partial cksum */
80 #define VIRTIO_NET_F_GUEST_CSUM (1 << 1) /* guest handles partial cksum */
81 #define VIRTIO_NET_F_MAC (1 << 5) /* host supplies MAC */
82 #define VIRTIO_NET_F_GSO_DEPREC (1 << 6) /* deprecated: host handles GSO */
83 #define VIRTIO_NET_F_GUEST_TSO4 (1 << 7) /* guest can rcv TSOv4 */
84 #define VIRTIO_NET_F_GUEST_TSO6 (1 << 8) /* guest can rcv TSOv6 */
85 #define VIRTIO_NET_F_GUEST_ECN (1 << 9) /* guest can rcv TSO with ECN */
86 #define VIRTIO_NET_F_GUEST_UFO (1 << 10) /* guest can rcv UFO */
87 #define VIRTIO_NET_F_HOST_TSO4 (1 << 11) /* host can rcv TSOv4 */
88 #define VIRTIO_NET_F_HOST_TSO6 (1 << 12) /* host can rcv TSOv6 */
89 #define VIRTIO_NET_F_HOST_ECN (1 << 13) /* host can rcv TSO with ECN */
90 #define VIRTIO_NET_F_HOST_UFO (1 << 14) /* host can rcv UFO */
91 #define VIRTIO_NET_F_MRG_RXBUF (1 << 15) /* host can merge RX buffers */
92 #define VIRTIO_NET_F_STATUS (1 << 16) /* config status field available */
93 #define VIRTIO_NET_F_CTRL_VQ (1 << 17) /* control channel available */
94 #define VIRTIO_NET_F_CTRL_RX (1 << 18) /* control channel RX mode support */
95 #define VIRTIO_NET_F_CTRL_VLAN (1 << 19) /* control channel VLAN filtering */
96 #define VIRTIO_NET_F_GUEST_ANNOUNCE \
97 (1 << 21) /* guest can send gratuitous pkts */
99 #define VTNET_S_HOSTCAPS \
100 ( VIRTIO_NET_F_MAC | VIRTIO_NET_F_MRG_RXBUF | VIRTIO_NET_F_STATUS | \
101 VIRTIO_F_NOTIFY_ON_EMPTY | VIRTIO_RING_F_INDIRECT_DESC)
104 * PCI config-space "registers"
106 struct virtio_net_config {
116 #define VTNET_CTLQ 2 /* NB: not yet supported */
121 * Fixed network header size
123 struct virtio_net_rxhdr {
125 uint8_t vrh_gso_type;
126 uint16_t vrh_hdr_len;
127 uint16_t vrh_gso_size;
128 uint16_t vrh_csum_start;
129 uint16_t vrh_csum_offset;
136 static int pci_vtnet_debug;
137 #define DPRINTF(params) if (pci_vtnet_debug) printf params
138 #define WPRINTF(params) printf params
143 struct pci_vtnet_softc {
144 struct virtio_softc vsc_vs;
145 struct vqueue_info vsc_queues[VTNET_MAXQ - 1];
146 pthread_mutex_t vsc_mtx;
147 struct mevent *vsc_mevp;
150 struct nm_desc *vsc_nmd;
153 volatile int resetting; /* set and checked outside lock */
155 uint64_t vsc_features; /* negotiated features */
157 struct virtio_net_config vsc_config;
159 pthread_mutex_t rx_mtx;
162 int rx_merge; /* merged rx bufs in use */
165 pthread_mutex_t tx_mtx;
166 pthread_cond_t tx_cond;
169 void (*pci_vtnet_rx)(struct pci_vtnet_softc *sc);
170 void (*pci_vtnet_tx)(struct pci_vtnet_softc *sc, struct iovec *iov,
171 int iovcnt, int len);
174 static void pci_vtnet_reset(void *);
175 /* static void pci_vtnet_notify(void *, struct vqueue_info *); */
176 static int pci_vtnet_cfgread(void *, int, int, uint32_t *);
177 static int pci_vtnet_cfgwrite(void *, int, int, uint32_t);
178 static void pci_vtnet_neg_features(void *, uint64_t);
180 static struct virtio_consts vtnet_vi_consts = {
181 "vtnet", /* our name */
182 VTNET_MAXQ - 1, /* we currently support 2 virtqueues */
183 sizeof(struct virtio_net_config), /* config reg size */
184 pci_vtnet_reset, /* reset */
185 NULL, /* device-wide qnotify -- not used */
186 pci_vtnet_cfgread, /* read PCI config */
187 pci_vtnet_cfgwrite, /* write PCI config */
188 pci_vtnet_neg_features, /* apply negotiated features */
189 VTNET_S_HOSTCAPS, /* our capabilities */
193 * If the transmit thread is active then stall until it is done.
196 pci_vtnet_txwait(struct pci_vtnet_softc *sc)
199 pthread_mutex_lock(&sc->tx_mtx);
200 while (sc->tx_in_progress) {
201 pthread_mutex_unlock(&sc->tx_mtx);
203 pthread_mutex_lock(&sc->tx_mtx);
205 pthread_mutex_unlock(&sc->tx_mtx);
209 * If the receive thread is active then stall until it is done.
212 pci_vtnet_rxwait(struct pci_vtnet_softc *sc)
215 pthread_mutex_lock(&sc->rx_mtx);
216 while (sc->rx_in_progress) {
217 pthread_mutex_unlock(&sc->rx_mtx);
219 pthread_mutex_lock(&sc->rx_mtx);
221 pthread_mutex_unlock(&sc->rx_mtx);
225 pci_vtnet_reset(void *vsc)
227 struct pci_vtnet_softc *sc = vsc;
229 DPRINTF(("vtnet: device reset requested !\n"));
234 * Wait for the transmit and receive threads to finish their
237 pci_vtnet_txwait(sc);
238 pci_vtnet_rxwait(sc);
240 sc->vsc_rx_ready = 0;
242 sc->rx_vhdrlen = sizeof(struct virtio_net_rxhdr);
244 /* now reset rings, MSI-X vectors, and negotiated capabilities */
245 vi_reset_dev(&sc->vsc_vs);
251 * Called to send a buffer chain out to the tap device
254 pci_vtnet_tap_tx(struct pci_vtnet_softc *sc, struct iovec *iov, int iovcnt,
257 static char pad[60]; /* all zero bytes */
259 if (sc->vsc_tapfd == -1)
263 * If the length is < 60, pad out to that and add the
264 * extra zero'd segment to the iov. It is guaranteed that
265 * there is always an extra iov available by the caller.
268 iov[iovcnt].iov_base = pad;
269 iov[iovcnt].iov_len = 60 - len;
272 (void) writev(sc->vsc_tapfd, iov, iovcnt);
276 * Called when there is read activity on the tap file descriptor.
277 * Each buffer posted by the guest is assumed to be able to contain
278 * an entire ethernet frame + rx header.
279 * MP note: the dummybuf is only used for discarding frames, so there
280 * is no need for it to be per-vtnet or locked.
282 static uint8_t dummybuf[2048];
284 static __inline struct iovec *
285 rx_iov_trim(struct iovec *iov, int *niov, int tlen)
289 /* XXX short-cut: assume first segment is >= tlen */
290 assert(iov[0].iov_len >= tlen);
292 iov[0].iov_len -= tlen;
293 if (iov[0].iov_len == 0) {
298 iov[0].iov_base = (void *)((uintptr_t)iov[0].iov_base + tlen);
306 pci_vtnet_tap_rx(struct pci_vtnet_softc *sc)
308 struct iovec iov[VTNET_MAXSEGS], *riov;
309 struct vqueue_info *vq;
315 * Should never be called without a valid tap fd
317 assert(sc->vsc_tapfd != -1);
320 * But, will be called when the rx ring hasn't yet
321 * been set up or the guest is resetting the device.
323 if (!sc->vsc_rx_ready || sc->resetting) {
325 * Drop the packet and try later.
327 (void) read(sc->vsc_tapfd, dummybuf, sizeof(dummybuf));
332 * Check for available rx buffers
334 vq = &sc->vsc_queues[VTNET_RXQ];
335 if (!vq_has_descs(vq)) {
337 * Drop the packet and try later. Interrupt on
338 * empty, if that's negotiated.
340 (void) read(sc->vsc_tapfd, dummybuf, sizeof(dummybuf));
347 * Get descriptor chain.
349 n = vq_getchain(vq, &idx, iov, VTNET_MAXSEGS, NULL);
350 assert(n >= 1 && n <= VTNET_MAXSEGS);
353 * Get a pointer to the rx header, and use the
354 * data immediately following it for the packet buffer.
356 vrx = iov[0].iov_base;
357 riov = rx_iov_trim(iov, &n, sc->rx_vhdrlen);
359 len = readv(sc->vsc_tapfd, riov, n);
361 if (len < 0 && errno == EWOULDBLOCK) {
363 * No more packets, but still some avail ring
364 * entries. Interrupt if needed/appropriate.
372 * The only valid field in the rx packet header is the
373 * number of buffers if merged rx bufs were negotiated.
375 memset(vrx, 0, sc->rx_vhdrlen);
378 struct virtio_net_rxhdr *vrxh;
385 * Release this chain and handle more chains.
387 vq_relchain(vq, idx, len + sc->rx_vhdrlen);
388 } while (vq_has_descs(vq));
390 /* Interrupt if needed, including for NOTIFY_ON_EMPTY. */
395 pci_vtnet_netmap_writev(struct nm_desc *nmd, struct iovec *iov, int iovcnt)
400 for (r = nmd->cur_tx_ring; ; ) {
401 struct netmap_ring *ring = NETMAP_TXRING(nmd->nifp, r);
405 if (nm_ring_empty(ring)) {
407 if (r > nmd->last_tx_ring)
408 r = nmd->first_tx_ring;
409 if (r == nmd->cur_tx_ring)
414 idx = ring->slot[cur].buf_idx;
415 buf = NETMAP_BUF(ring, idx);
417 for (i = 0; i < iovcnt; i++) {
418 if (len + iov[i].iov_len > 2048)
420 memcpy(&buf[len], iov[i].iov_base, iov[i].iov_len);
421 len += iov[i].iov_len;
423 ring->slot[cur].len = len;
424 ring->head = ring->cur = nm_ring_next(ring, cur);
425 nmd->cur_tx_ring = r;
426 ioctl(nmd->fd, NIOCTXSYNC, NULL);
434 pci_vtnet_netmap_readv(struct nm_desc *nmd, struct iovec *iov, int iovcnt)
440 for (r = nmd->cur_rx_ring; ; ) {
441 struct netmap_ring *ring = NETMAP_RXRING(nmd->nifp, r);
446 if (nm_ring_empty(ring)) {
448 if (r > nmd->last_rx_ring)
449 r = nmd->first_rx_ring;
450 if (r == nmd->cur_rx_ring)
455 idx = ring->slot[cur].buf_idx;
456 buf = NETMAP_BUF(ring, idx);
457 left = ring->slot[cur].len;
459 for (i = 0; i < iovcnt && left > 0; i++) {
460 if (iov[i].iov_len > left)
461 iov[i].iov_len = left;
462 memcpy(iov[i].iov_base, &buf[len], iov[i].iov_len);
463 len += iov[i].iov_len;
464 left -= iov[i].iov_len;
466 ring->head = ring->cur = nm_ring_next(ring, cur);
467 nmd->cur_rx_ring = r;
468 ioctl(nmd->fd, NIOCRXSYNC, NULL);
471 for (; i < iovcnt; i++)
478 * Called to send a buffer chain out to the vale port
481 pci_vtnet_netmap_tx(struct pci_vtnet_softc *sc, struct iovec *iov, int iovcnt,
484 static char pad[60]; /* all zero bytes */
486 if (sc->vsc_nmd == NULL)
490 * If the length is < 60, pad out to that and add the
491 * extra zero'd segment to the iov. It is guaranteed that
492 * there is always an extra iov available by the caller.
495 iov[iovcnt].iov_base = pad;
496 iov[iovcnt].iov_len = 60 - len;
499 (void) pci_vtnet_netmap_writev(sc->vsc_nmd, iov, iovcnt);
503 pci_vtnet_netmap_rx(struct pci_vtnet_softc *sc)
505 struct iovec iov[VTNET_MAXSEGS], *riov;
506 struct vqueue_info *vq;
512 * Should never be called without a valid netmap descriptor
514 assert(sc->vsc_nmd != NULL);
517 * But, will be called when the rx ring hasn't yet
518 * been set up or the guest is resetting the device.
520 if (!sc->vsc_rx_ready || sc->resetting) {
522 * Drop the packet and try later.
524 (void) nm_nextpkt(sc->vsc_nmd, (void *)dummybuf);
529 * Check for available rx buffers
531 vq = &sc->vsc_queues[VTNET_RXQ];
532 if (!vq_has_descs(vq)) {
534 * Drop the packet and try later. Interrupt on
535 * empty, if that's negotiated.
537 (void) nm_nextpkt(sc->vsc_nmd, (void *)dummybuf);
544 * Get descriptor chain.
546 n = vq_getchain(vq, &idx, iov, VTNET_MAXSEGS, NULL);
547 assert(n >= 1 && n <= VTNET_MAXSEGS);
550 * Get a pointer to the rx header, and use the
551 * data immediately following it for the packet buffer.
553 vrx = iov[0].iov_base;
554 riov = rx_iov_trim(iov, &n, sc->rx_vhdrlen);
556 len = pci_vtnet_netmap_readv(sc->vsc_nmd, riov, n);
560 * No more packets, but still some avail ring
561 * entries. Interrupt if needed/appropriate.
569 * The only valid field in the rx packet header is the
570 * number of buffers if merged rx bufs were negotiated.
572 memset(vrx, 0, sc->rx_vhdrlen);
575 struct virtio_net_rxhdr *vrxh;
582 * Release this chain and handle more chains.
584 vq_relchain(vq, idx, len + sc->rx_vhdrlen);
585 } while (vq_has_descs(vq));
587 /* Interrupt if needed, including for NOTIFY_ON_EMPTY. */
592 pci_vtnet_rx_callback(int fd, enum ev_type type, void *param)
594 struct pci_vtnet_softc *sc = param;
596 pthread_mutex_lock(&sc->rx_mtx);
597 sc->rx_in_progress = 1;
598 sc->pci_vtnet_rx(sc);
599 sc->rx_in_progress = 0;
600 pthread_mutex_unlock(&sc->rx_mtx);
605 pci_vtnet_ping_rxq(void *vsc, struct vqueue_info *vq)
607 struct pci_vtnet_softc *sc = vsc;
610 * A qnotify means that the rx process can now begin
612 if (sc->vsc_rx_ready == 0) {
613 sc->vsc_rx_ready = 1;
614 vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
619 pci_vtnet_proctx(struct pci_vtnet_softc *sc, struct vqueue_info *vq)
621 struct iovec iov[VTNET_MAXSEGS + 1];
627 * Obtain chain of descriptors. The first one is
628 * really the header descriptor, so we need to sum
629 * up two lengths: packet length and transfer length.
631 n = vq_getchain(vq, &idx, iov, VTNET_MAXSEGS, NULL);
632 assert(n >= 1 && n <= VTNET_MAXSEGS);
634 tlen = iov[0].iov_len;
635 for (i = 1; i < n; i++) {
636 plen += iov[i].iov_len;
637 tlen += iov[i].iov_len;
640 DPRINTF(("virtio: packet send, %d bytes, %d segs\n\r", plen, n));
641 sc->pci_vtnet_tx(sc, &iov[1], n - 1, plen);
643 /* chain is processed, release it and set tlen */
644 vq_relchain(vq, idx, tlen);
648 pci_vtnet_ping_txq(void *vsc, struct vqueue_info *vq)
650 struct pci_vtnet_softc *sc = vsc;
653 * Any ring entries to process?
655 if (!vq_has_descs(vq))
658 /* Signal the tx thread for processing */
659 pthread_mutex_lock(&sc->tx_mtx);
660 vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
661 if (sc->tx_in_progress == 0)
662 pthread_cond_signal(&sc->tx_cond);
663 pthread_mutex_unlock(&sc->tx_mtx);
667 * Thread which will handle processing of TX desc
670 pci_vtnet_tx_thread(void *param)
672 struct pci_vtnet_softc *sc = param;
673 struct vqueue_info *vq;
676 vq = &sc->vsc_queues[VTNET_TXQ];
679 * Let us wait till the tx queue pointers get initialised &
682 pthread_mutex_lock(&sc->tx_mtx);
683 error = pthread_cond_wait(&sc->tx_cond, &sc->tx_mtx);
687 /* note - tx mutex is locked here */
688 while (sc->resetting || !vq_has_descs(vq)) {
689 vq->vq_used->vu_flags &= ~VRING_USED_F_NO_NOTIFY;
691 if (!sc->resetting && vq_has_descs(vq))
694 sc->tx_in_progress = 0;
695 error = pthread_cond_wait(&sc->tx_cond, &sc->tx_mtx);
698 vq->vq_used->vu_flags |= VRING_USED_F_NO_NOTIFY;
699 sc->tx_in_progress = 1;
700 pthread_mutex_unlock(&sc->tx_mtx);
704 * Run through entries, placing them into
705 * iovecs and sending when an end-of-packet
708 pci_vtnet_proctx(sc, vq);
709 } while (vq_has_descs(vq));
712 * Generate an interrupt if needed.
716 pthread_mutex_lock(&sc->tx_mtx);
722 pci_vtnet_ping_ctlq(void *vsc, struct vqueue_info *vq)
725 DPRINTF(("vtnet: control qnotify!\n\r"));
730 pci_vtnet_parsemac(char *mac_str, uint8_t *mac_addr)
732 struct ether_addr *ea;
734 char zero_addr[ETHER_ADDR_LEN] = { 0, 0, 0, 0, 0, 0 };
736 tmpstr = strsep(&mac_str,"=");
738 if ((mac_str != NULL) && (!strcmp(tmpstr,"mac"))) {
739 ea = ether_aton(mac_str);
741 if (ea == NULL || ETHER_IS_MULTICAST(ea->octet) ||
742 memcmp(ea->octet, zero_addr, ETHER_ADDR_LEN) == 0) {
743 fprintf(stderr, "Invalid MAC %s\n", mac_str);
746 memcpy(mac_addr, ea->octet, ETHER_ADDR_LEN);
753 pci_vtnet_tap_setup(struct pci_vtnet_softc *sc, char *devname)
756 #ifndef WITHOUT_CAPSICUM
760 strcpy(tbuf, "/dev/");
761 strlcat(tbuf, devname, sizeof(tbuf));
763 sc->pci_vtnet_rx = pci_vtnet_tap_rx;
764 sc->pci_vtnet_tx = pci_vtnet_tap_tx;
766 sc->vsc_tapfd = open(tbuf, O_RDWR);
767 if (sc->vsc_tapfd == -1) {
768 WPRINTF(("open of tap device %s failed\n", tbuf));
773 * Set non-blocking and register for read
774 * notifications with the event loop
777 if (ioctl(sc->vsc_tapfd, FIONBIO, &opt) < 0) {
778 WPRINTF(("tap device O_NONBLOCK failed\n"));
779 close(sc->vsc_tapfd);
783 #ifndef WITHOUT_CAPSICUM
784 cap_rights_init(&rights, CAP_EVENT, CAP_READ, CAP_WRITE);
785 if (caph_rights_limit(sc->vsc_tapfd, &rights) == -1)
786 errx(EX_OSERR, "Unable to apply rights for sandbox");
789 sc->vsc_mevp = mevent_add(sc->vsc_tapfd,
791 pci_vtnet_rx_callback,
793 if (sc->vsc_mevp == NULL) {
794 WPRINTF(("Could not register event\n"));
795 close(sc->vsc_tapfd);
801 pci_vtnet_netmap_setup(struct pci_vtnet_softc *sc, char *ifname)
803 sc->pci_vtnet_rx = pci_vtnet_netmap_rx;
804 sc->pci_vtnet_tx = pci_vtnet_netmap_tx;
806 sc->vsc_nmd = nm_open(ifname, NULL, 0, 0);
807 if (sc->vsc_nmd == NULL) {
808 WPRINTF(("open of netmap device %s failed\n", ifname));
812 sc->vsc_mevp = mevent_add(sc->vsc_nmd->fd,
814 pci_vtnet_rx_callback,
816 if (sc->vsc_mevp == NULL) {
817 WPRINTF(("Could not register event\n"));
818 nm_close(sc->vsc_nmd);
824 pci_vtnet_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
827 unsigned char digest[16];
829 char tname[MAXCOMLEN + 1];
830 struct pci_vtnet_softc *sc;
835 sc = calloc(1, sizeof(struct pci_vtnet_softc));
837 pthread_mutex_init(&sc->vsc_mtx, NULL);
839 vi_softc_linkup(&sc->vsc_vs, &vtnet_vi_consts, sc, pi, sc->vsc_queues);
840 sc->vsc_vs.vs_mtx = &sc->vsc_mtx;
842 sc->vsc_queues[VTNET_RXQ].vq_qsize = VTNET_RINGSZ;
843 sc->vsc_queues[VTNET_RXQ].vq_notify = pci_vtnet_ping_rxq;
844 sc->vsc_queues[VTNET_TXQ].vq_qsize = VTNET_RINGSZ;
845 sc->vsc_queues[VTNET_TXQ].vq_notify = pci_vtnet_ping_txq;
847 sc->vsc_queues[VTNET_CTLQ].vq_qsize = VTNET_RINGSZ;
848 sc->vsc_queues[VTNET_CTLQ].vq_notify = pci_vtnet_ping_ctlq;
852 * Attempt to open the tap device and read the MAC address
861 devname = vtopts = strdup(opts);
862 (void) strsep(&vtopts, ",");
864 if (vtopts != NULL) {
865 err = pci_vtnet_parsemac(vtopts, sc->vsc_config.mac);
873 if (strncmp(devname, "vale", 4) == 0)
874 pci_vtnet_netmap_setup(sc, devname);
875 if (strncmp(devname, "tap", 3) == 0 ||
876 strncmp(devname, "vmnet", 5) == 0)
877 pci_vtnet_tap_setup(sc, devname);
883 * The default MAC address is the standard NetApp OUI of 00-a0-98,
884 * followed by an MD5 of the PCI slot/func number and dev name
887 snprintf(nstr, sizeof(nstr), "%d-%d-%s", pi->pi_slot,
888 pi->pi_func, vmname);
891 MD5Update(&mdctx, nstr, strlen(nstr));
892 MD5Final(digest, &mdctx);
894 sc->vsc_config.mac[0] = 0x00;
895 sc->vsc_config.mac[1] = 0xa0;
896 sc->vsc_config.mac[2] = 0x98;
897 sc->vsc_config.mac[3] = digest[0];
898 sc->vsc_config.mac[4] = digest[1];
899 sc->vsc_config.mac[5] = digest[2];
902 /* initialize config space */
903 pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_NET);
904 pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR);
905 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_NETWORK);
906 pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_TYPE_NET);
907 pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR);
909 /* Link is up if we managed to open tap device or vale port. */
910 sc->vsc_config.status = (opts == NULL || sc->vsc_tapfd >= 0 ||
911 sc->vsc_nmd != NULL);
913 /* use BAR 1 to map MSI-X table and PBA, if we're using MSI-X */
914 if (vi_intr_init(&sc->vsc_vs, 1, fbsdrun_virtio_msix()))
917 /* use BAR 0 to map config regs in IO space */
918 vi_set_io_bar(&sc->vsc_vs, 0);
923 sc->rx_vhdrlen = sizeof(struct virtio_net_rxhdr);
924 sc->rx_in_progress = 0;
925 pthread_mutex_init(&sc->rx_mtx, NULL);
928 * Initialize tx semaphore & spawn TX processing thread.
929 * As of now, only one thread for TX desc processing is
932 sc->tx_in_progress = 0;
933 pthread_mutex_init(&sc->tx_mtx, NULL);
934 pthread_cond_init(&sc->tx_cond, NULL);
935 pthread_create(&sc->tx_tid, NULL, pci_vtnet_tx_thread, (void *)sc);
936 snprintf(tname, sizeof(tname), "vtnet-%d:%d tx", pi->pi_slot,
938 pthread_set_name_np(sc->tx_tid, tname);
944 pci_vtnet_cfgwrite(void *vsc, int offset, int size, uint32_t value)
946 struct pci_vtnet_softc *sc = vsc;
950 assert(offset + size <= 6);
952 * The driver is allowed to change the MAC address
954 ptr = &sc->vsc_config.mac[offset];
955 memcpy(ptr, &value, size);
957 /* silently ignore other writes */
958 DPRINTF(("vtnet: write to readonly reg %d\n\r", offset));
965 pci_vtnet_cfgread(void *vsc, int offset, int size, uint32_t *retval)
967 struct pci_vtnet_softc *sc = vsc;
970 ptr = (uint8_t *)&sc->vsc_config + offset;
971 memcpy(retval, ptr, size);
976 pci_vtnet_neg_features(void *vsc, uint64_t negotiated_features)
978 struct pci_vtnet_softc *sc = vsc;
980 sc->vsc_features = negotiated_features;
982 if (!(sc->vsc_features & VIRTIO_NET_F_MRG_RXBUF)) {
984 /* non-merge rx header is 2 bytes shorter */
989 struct pci_devemu pci_de_vnet = {
990 .pe_emu = "virtio-net",
991 .pe_init = pci_vtnet_init,
992 .pe_barwrite = vi_pci_write,
993 .pe_barread = vi_pci_read
995 PCI_EMUL_SET(pci_de_vnet);