4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2009 Red Hat, Inc.
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
26 #include "qemu/osdep.h"
30 #include <sys/ioctl.h>
32 #include <sys/socket.h>
38 #include "monitor/monitor.h"
39 #include "sysemu/sysemu.h"
40 #include "qapi/error.h"
41 #include "qemu/cutils.h"
42 #include "qemu/error-report.h"
43 #include "qemu/main-loop.h"
44 #include "qemu/sockets.h"
48 #include "net/vhost_net.h"
50 typedef struct TAPState {
53 char down_script[1024];
54 char down_script_arg[128];
55 uint8_t buf[NET_BUFSIZE];
62 VHostNetState *vhost_net;
63 unsigned host_vnet_hdr_len;
67 static void launch_script(const char *setup_script, const char *ifname,
68 int fd, Error **errp);
70 static void tap_send(void *opaque);
71 static void tap_writable(void *opaque);
73 static void tap_update_fd_handler(TAPState *s)
75 qemu_set_fd_handler(s->fd,
76 s->read_poll && s->enabled ? tap_send : NULL,
77 s->write_poll && s->enabled ? tap_writable : NULL,
81 static void tap_read_poll(TAPState *s, bool enable)
83 s->read_poll = enable;
84 tap_update_fd_handler(s);
87 static void tap_write_poll(TAPState *s, bool enable)
89 s->write_poll = enable;
90 tap_update_fd_handler(s);
93 static void tap_writable(void *opaque)
97 tap_write_poll(s, false);
99 qemu_flush_queued_packets(&s->nc);
102 static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt)
106 len = RETRY_ON_EINTR(writev(s->fd, iov, iovcnt));
108 if (len == -1 && errno == EAGAIN) {
109 tap_write_poll(s, true);
116 static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
119 TAPState *s = DO_UPCAST(TAPState, nc, nc);
120 const struct iovec *iovp = iov;
121 g_autofree struct iovec *iov_copy = NULL;
122 struct virtio_net_hdr_mrg_rxbuf hdr = { };
124 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
125 iov_copy = g_new(struct iovec, iovcnt + 1);
126 iov_copy[0].iov_base = &hdr;
127 iov_copy[0].iov_len = s->host_vnet_hdr_len;
128 memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
133 return tap_write_packet(s, iovp, iovcnt);
136 static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size)
138 TAPState *s = DO_UPCAST(TAPState, nc, nc);
141 struct virtio_net_hdr_mrg_rxbuf hdr = { };
143 if (s->host_vnet_hdr_len) {
144 iov[iovcnt].iov_base = &hdr;
145 iov[iovcnt].iov_len = s->host_vnet_hdr_len;
149 iov[iovcnt].iov_base = (char *)buf;
150 iov[iovcnt].iov_len = size;
153 return tap_write_packet(s, iov, iovcnt);
156 static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
158 TAPState *s = DO_UPCAST(TAPState, nc, nc);
161 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
162 return tap_receive_raw(nc, buf, size);
165 iov[0].iov_base = (char *)buf;
166 iov[0].iov_len = size;
168 return tap_write_packet(s, iov, 1);
172 ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
174 return read(tapfd, buf, maxlen);
178 static void tap_send_completed(NetClientState *nc, ssize_t len)
180 TAPState *s = DO_UPCAST(TAPState, nc, nc);
181 tap_read_poll(s, true);
184 static void tap_send(void *opaque)
186 TAPState *s = opaque;
191 uint8_t *buf = s->buf;
192 uint8_t min_pkt[ETH_ZLEN];
193 size_t min_pktsz = sizeof(min_pkt);
195 size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
200 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
201 buf += s->host_vnet_hdr_len;
202 size -= s->host_vnet_hdr_len;
205 if (net_peer_needs_padding(&s->nc)) {
206 if (eth_pad_short_frame(min_pkt, &min_pktsz, buf, size)) {
212 size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
214 tap_read_poll(s, false);
216 } else if (size < 0) {
221 * When the host keeps receiving more packets while tap_send() is
222 * running we can hog the QEMU global mutex. Limit the number of
223 * packets that are processed per tap_send() callback to prevent
224 * stalling the guest.
233 static bool tap_has_ufo(NetClientState *nc)
235 TAPState *s = DO_UPCAST(TAPState, nc, nc);
237 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
242 static bool tap_has_uso(NetClientState *nc)
244 TAPState *s = DO_UPCAST(TAPState, nc, nc);
246 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
251 static bool tap_has_vnet_hdr(NetClientState *nc)
253 TAPState *s = DO_UPCAST(TAPState, nc, nc);
255 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
257 return !!s->host_vnet_hdr_len;
260 static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
262 TAPState *s = DO_UPCAST(TAPState, nc, nc);
264 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
266 return !!tap_probe_vnet_hdr_len(s->fd, len);
269 static int tap_get_vnet_hdr_len(NetClientState *nc)
271 TAPState *s = DO_UPCAST(TAPState, nc, nc);
273 return s->host_vnet_hdr_len;
276 static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
278 TAPState *s = DO_UPCAST(TAPState, nc, nc);
280 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
281 assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
282 len == sizeof(struct virtio_net_hdr) ||
283 len == sizeof(struct virtio_net_hdr_v1_hash));
285 tap_fd_set_vnet_hdr_len(s->fd, len);
286 s->host_vnet_hdr_len = len;
289 static bool tap_get_using_vnet_hdr(NetClientState *nc)
291 TAPState *s = DO_UPCAST(TAPState, nc, nc);
293 return s->using_vnet_hdr;
296 static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
298 TAPState *s = DO_UPCAST(TAPState, nc, nc);
300 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
301 assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
303 s->using_vnet_hdr = using_vnet_hdr;
306 static int tap_set_vnet_le(NetClientState *nc, bool is_le)
308 TAPState *s = DO_UPCAST(TAPState, nc, nc);
310 return tap_fd_set_vnet_le(s->fd, is_le);
313 static int tap_set_vnet_be(NetClientState *nc, bool is_be)
315 TAPState *s = DO_UPCAST(TAPState, nc, nc);
317 return tap_fd_set_vnet_be(s->fd, is_be);
320 static void tap_set_offload(NetClientState *nc, int csum, int tso4,
321 int tso6, int ecn, int ufo, int uso4, int uso6)
323 TAPState *s = DO_UPCAST(TAPState, nc, nc);
328 tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo, uso4, uso6);
331 static void tap_exit_notify(Notifier *notifier, void *data)
333 TAPState *s = container_of(notifier, TAPState, exit);
336 if (s->down_script[0]) {
337 launch_script(s->down_script, s->down_script_arg, s->fd, &err);
339 error_report_err(err);
344 static void tap_cleanup(NetClientState *nc)
346 TAPState *s = DO_UPCAST(TAPState, nc, nc);
349 vhost_net_cleanup(s->vhost_net);
350 g_free(s->vhost_net);
354 qemu_purge_queued_packets(nc);
356 tap_exit_notify(&s->exit, NULL);
357 qemu_remove_exit_notifier(&s->exit);
359 tap_read_poll(s, false);
360 tap_write_poll(s, false);
365 static void tap_poll(NetClientState *nc, bool enable)
367 TAPState *s = DO_UPCAST(TAPState, nc, nc);
368 tap_read_poll(s, enable);
369 tap_write_poll(s, enable);
372 static bool tap_set_steering_ebpf(NetClientState *nc, int prog_fd)
374 TAPState *s = DO_UPCAST(TAPState, nc, nc);
375 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
377 return tap_fd_set_steering_ebpf(s->fd, prog_fd) == 0;
380 int tap_get_fd(NetClientState *nc)
382 TAPState *s = DO_UPCAST(TAPState, nc, nc);
383 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
389 static NetClientInfo net_tap_info = {
390 .type = NET_CLIENT_DRIVER_TAP,
391 .size = sizeof(TAPState),
392 .receive = tap_receive,
393 .receive_raw = tap_receive_raw,
394 .receive_iov = tap_receive_iov,
396 .cleanup = tap_cleanup,
397 .has_ufo = tap_has_ufo,
398 .has_uso = tap_has_uso,
399 .has_vnet_hdr = tap_has_vnet_hdr,
400 .has_vnet_hdr_len = tap_has_vnet_hdr_len,
401 .get_using_vnet_hdr = tap_get_using_vnet_hdr,
402 .using_vnet_hdr = tap_using_vnet_hdr,
403 .set_offload = tap_set_offload,
404 .get_vnet_hdr_len = tap_get_vnet_hdr_len,
405 .set_vnet_hdr_len = tap_set_vnet_hdr_len,
406 .set_vnet_le = tap_set_vnet_le,
407 .set_vnet_be = tap_set_vnet_be,
408 .set_steering_ebpf = tap_set_steering_ebpf,
411 static TAPState *net_tap_fd_init(NetClientState *peer,
420 nc = qemu_new_net_client(&net_tap_info, peer, model, name);
422 s = DO_UPCAST(TAPState, nc, nc);
425 s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
426 s->using_vnet_hdr = false;
427 s->has_ufo = tap_probe_has_ufo(s->fd);
428 s->has_uso = tap_probe_has_uso(s->fd);
430 tap_set_offload(&s->nc, 0, 0, 0, 0, 0, 0, 0);
432 * Make sure host header length is set correctly in tap:
433 * it might have been modified by another instance of qemu.
435 if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) {
436 tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len);
438 tap_read_poll(s, true);
441 s->exit.notify = tap_exit_notify;
442 qemu_add_exit_notifier(&s->exit);
447 static void launch_script(const char *setup_script, const char *ifname,
448 int fd, Error **errp)
454 /* try to launch network script */
457 error_setg_errno(errp, errno, "could not launch network script %s",
462 int open_max = sysconf(_SC_OPEN_MAX), i;
464 for (i = 3; i < open_max; i++) {
470 *parg++ = (char *)setup_script;
471 *parg++ = (char *)ifname;
473 execv(setup_script, args);
476 while (waitpid(pid, &status, 0) != pid) {
480 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
483 error_setg(errp, "network script %s failed with status %d",
484 setup_script, status);
488 static int recv_fd(int c)
491 uint8_t msgbuf[CMSG_SPACE(sizeof(fd))];
492 struct msghdr msg = {
493 .msg_control = msgbuf,
494 .msg_controllen = sizeof(msgbuf),
496 struct cmsghdr *cmsg;
501 cmsg = CMSG_FIRSTHDR(&msg);
502 cmsg->cmsg_level = SOL_SOCKET;
503 cmsg->cmsg_type = SCM_RIGHTS;
504 cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
505 msg.msg_controllen = cmsg->cmsg_len;
508 iov.iov_len = sizeof(req);
513 len = recvmsg(c, &msg, 0);
515 memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
522 static int net_bridge_run_helper(const char *helper, const char *bridge,
525 sigset_t oldmask, mask;
526 g_autofree char *default_helper = NULL;
533 sigaddset(&mask, SIGCHLD);
534 sigprocmask(SIG_BLOCK, &mask, &oldmask);
537 helper = default_helper = get_relocated_path(DEFAULT_BRIDGE_HELPER);
540 if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) {
541 error_setg_errno(errp, errno, "socketpair() failed");
545 /* try to launch bridge helper */
548 error_setg_errno(errp, errno, "Can't fork bridge helper");
552 int open_max = sysconf(_SC_OPEN_MAX), i;
555 char *helper_cmd = NULL;
557 for (i = 3; i < open_max; i++) {
563 fd_buf = g_strdup_printf("%s%d", "--fd=", sv[1]);
565 if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
566 /* assume helper is a command */
568 if (strstr(helper, "--br=") == NULL) {
569 br_buf = g_strdup_printf("%s%s", "--br=", bridge);
572 helper_cmd = g_strdup_printf("%s %s %s %s", helper,
573 "--use-vnet", fd_buf, br_buf ? br_buf : "");
576 *parg++ = (char *)"sh";
577 *parg++ = (char *)"-c";
578 *parg++ = helper_cmd;
581 execv("/bin/sh", args);
584 /* assume helper is just the executable path name */
586 br_buf = g_strdup_printf("%s%s", "--br=", bridge);
589 *parg++ = (char *)helper;
590 *parg++ = (char *)"--use-vnet";
607 fd = RETRY_ON_EINTR(recv_fd(sv[0]));
612 while (waitpid(pid, &status, 0) != pid) {
615 sigprocmask(SIG_SETMASK, &oldmask, NULL);
617 error_setg_errno(errp, saved_errno,
618 "failed to recv file descriptor");
621 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
622 error_setg(errp, "bridge helper failed");
629 int net_init_bridge(const Netdev *netdev, const char *name,
630 NetClientState *peer, Error **errp)
632 const NetdevBridgeOptions *bridge;
633 const char *helper, *br;
637 assert(netdev->type == NET_CLIENT_DRIVER_BRIDGE);
638 bridge = &netdev->u.bridge;
639 helper = bridge->helper;
640 br = bridge->br ?: DEFAULT_BRIDGE_INTERFACE;
642 fd = net_bridge_run_helper(helper, br, errp);
647 if (!g_unix_set_fd_nonblocking(fd, true, NULL)) {
648 error_setg_errno(errp, errno, "Failed to set FD nonblocking");
651 vnet_hdr = tap_probe_vnet_hdr(fd, errp);
656 s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
658 qemu_set_info_str(&s->nc, "helper=%s,br=%s", helper, br);
663 static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
664 const char *setup_script, char *ifname,
665 size_t ifname_sz, int mq_required, Error **errp)
668 int fd, vnet_hdr_required;
670 if (tap->has_vnet_hdr) {
671 *vnet_hdr = tap->vnet_hdr;
672 vnet_hdr_required = *vnet_hdr;
675 vnet_hdr_required = 0;
678 fd = RETRY_ON_EINTR(tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required,
685 setup_script[0] != '\0' &&
686 strcmp(setup_script, "no") != 0) {
687 launch_script(setup_script, ifname, fd, &err);
689 error_propagate(errp, err);
698 #define MAX_TAP_QUEUES 1024
700 static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
701 const char *model, const char *name,
702 const char *ifname, const char *script,
703 const char *downscript, const char *vhostfdname,
704 int vnet_hdr, int fd, Error **errp)
707 TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
710 tap_set_sndbuf(s->fd, tap, &err);
712 error_propagate(errp, err);
716 if (tap->fd || tap->fds) {
717 qemu_set_info_str(&s->nc, "fd=%d", fd);
718 } else if (tap->helper) {
719 qemu_set_info_str(&s->nc, "helper=%s", tap->helper);
721 qemu_set_info_str(&s->nc, "ifname=%s,script=%s,downscript=%s", ifname,
724 if (strcmp(downscript, "no") != 0) {
725 snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
726 snprintf(s->down_script_arg, sizeof(s->down_script_arg),
731 if (tap->has_vhost ? tap->vhost :
732 vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
733 VhostNetOptions options;
735 options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
736 options.net_backend = &s->nc;
737 if (tap->has_poll_us) {
738 options.busyloop_timeout = tap->poll_us;
740 options.busyloop_timeout = 0;
744 vhostfd = monitor_fd_param(monitor_cur(), vhostfdname, &err);
746 if (tap->has_vhostforce && tap->vhostforce) {
747 error_propagate(errp, err);
749 warn_report_err(err);
753 if (!g_unix_set_fd_nonblocking(vhostfd, true, NULL)) {
754 error_setg_errno(errp, errno, "%s: Can't use file descriptor %d",
759 vhostfd = open("/dev/vhost-net", O_RDWR);
761 if (tap->has_vhostforce && tap->vhostforce) {
762 error_setg_errno(errp, errno,
763 "tap: open vhost char device failed");
765 warn_report("tap: open vhost char device failed: %s",
770 if (!g_unix_set_fd_nonblocking(vhostfd, true, NULL)) {
771 error_setg_errno(errp, errno, "Failed to set FD nonblocking");
775 options.opaque = (void *)(uintptr_t)vhostfd;
778 s->vhost_net = vhost_net_init(&options);
780 if (tap->has_vhostforce && tap->vhostforce) {
781 error_setg(errp, VHOST_NET_INIT_FAILED);
783 warn_report(VHOST_NET_INIT_FAILED);
787 } else if (vhostfdname) {
788 error_setg(errp, "vhostfd(s)= is not valid without vhost");
795 qemu_del_net_client(&s->nc);
798 static int get_fds(char *str, char *fds[], int max)
800 char *ptr = str, *this;
801 size_t len = strlen(str);
804 while (i < max && ptr < str + len) {
805 this = strchr(ptr, ':');
808 fds[i] = g_strdup(ptr);
810 fds[i] = g_strndup(ptr, this - ptr);
824 int net_init_tap(const Netdev *netdev, const char *name,
825 NetClientState *peer, Error **errp)
827 const NetdevTapOptions *tap;
828 int fd, vnet_hdr = 0, i = 0, queues;
829 /* for the no-fd, no-helper case */
831 const char *downscript;
833 const char *vhostfdname;
837 assert(netdev->type == NET_CLIENT_DRIVER_TAP);
838 tap = &netdev->u.tap;
839 queues = tap->has_queues ? tap->queues : 1;
840 vhostfdname = tap->vhostfd;
841 script = tap->script;
842 downscript = tap->downscript;
844 /* QEMU hubs do not support multiqueue tap, in this case peer is set.
845 * For -netdev, peer is always NULL. */
846 if (peer && (tap->has_queues || tap->fds || tap->vhostfds)) {
847 error_setg(errp, "Multiqueue tap cannot be used with hubs");
852 if (tap->ifname || tap->script || tap->downscript ||
853 tap->has_vnet_hdr || tap->helper || tap->has_queues ||
854 tap->fds || tap->vhostfds) {
855 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
856 "helper=, queues=, fds=, and vhostfds= "
857 "are invalid with fd=");
861 fd = monitor_fd_param(monitor_cur(), tap->fd, errp);
866 if (!g_unix_set_fd_nonblocking(fd, true, NULL)) {
867 error_setg_errno(errp, errno, "%s: Can't use file descriptor %d",
873 vnet_hdr = tap_probe_vnet_hdr(fd, errp);
879 net_init_tap_one(tap, peer, "tap", name, NULL,
881 vhostfdname, vnet_hdr, fd, &err);
883 error_propagate(errp, err);
887 } else if (tap->fds) {
890 int nfds = 0, nvhosts = 0;
892 if (tap->ifname || tap->script || tap->downscript ||
893 tap->has_vnet_hdr || tap->helper || tap->has_queues ||
895 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
896 "helper=, queues=, and vhostfd= "
897 "are invalid with fds=");
901 fds = g_new0(char *, MAX_TAP_QUEUES);
902 vhost_fds = g_new0(char *, MAX_TAP_QUEUES);
904 nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES);
906 nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES);
907 if (nfds != nvhosts) {
908 error_setg(errp, "The number of fds passed does not match "
909 "the number of vhostfds passed");
915 for (i = 0; i < nfds; i++) {
916 fd = monitor_fd_param(monitor_cur(), fds[i], errp);
922 ret = g_unix_set_fd_nonblocking(fd, true, NULL);
924 error_setg_errno(errp, errno, "%s: Can't use file descriptor %d",
930 vnet_hdr = tap_probe_vnet_hdr(fd, errp);
935 } else if (vnet_hdr != tap_probe_vnet_hdr(fd, NULL)) {
937 "vnet_hdr not consistent across given tap fds");
942 net_init_tap_one(tap, peer, "tap", name, ifname,
944 tap->vhostfds ? vhost_fds[i] : NULL,
947 error_propagate(errp, err);
954 for (i = 0; i < nvhosts; i++) {
955 g_free(vhost_fds[i]);
957 for (i = 0; i < nfds; i++) {
963 } else if (tap->helper) {
964 if (tap->ifname || tap->script || tap->downscript ||
965 tap->has_vnet_hdr || tap->has_queues || tap->vhostfds) {
966 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
967 "queues=, and vhostfds= are invalid with helper=");
971 fd = net_bridge_run_helper(tap->helper,
972 tap->br ?: DEFAULT_BRIDGE_INTERFACE,
978 if (!g_unix_set_fd_nonblocking(fd, true, NULL)) {
979 error_setg_errno(errp, errno, "Failed to set FD nonblocking");
982 vnet_hdr = tap_probe_vnet_hdr(fd, errp);
988 net_init_tap_one(tap, peer, "bridge", name, ifname,
989 script, downscript, vhostfdname,
992 error_propagate(errp, err);
997 g_autofree char *default_script = NULL;
998 g_autofree char *default_downscript = NULL;
1000 error_setg(errp, "vhostfds= is invalid if fds= wasn't specified");
1005 script = default_script = get_relocated_path(DEFAULT_NETWORK_SCRIPT);
1008 downscript = default_downscript =
1009 get_relocated_path(DEFAULT_NETWORK_DOWN_SCRIPT);
1013 pstrcpy(ifname, sizeof ifname, tap->ifname);
1018 for (i = 0; i < queues; i++) {
1019 fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script,
1020 ifname, sizeof ifname, queues > 1, errp);
1025 if (queues > 1 && i == 0 && !tap->ifname) {
1026 if (tap_fd_get_ifname(fd, ifname)) {
1027 error_setg(errp, "Fail to get ifname");
1033 net_init_tap_one(tap, peer, "tap", name, ifname,
1034 i >= 1 ? "no" : script,
1035 i >= 1 ? "no" : downscript,
1036 vhostfdname, vnet_hdr, fd, &err);
1038 error_propagate(errp, err);
1048 VHostNetState *tap_get_vhost_net(NetClientState *nc)
1050 TAPState *s = DO_UPCAST(TAPState, nc, nc);
1051 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
1052 return s->vhost_net;
1055 int tap_enable(NetClientState *nc)
1057 TAPState *s = DO_UPCAST(TAPState, nc, nc);
1063 ret = tap_fd_enable(s->fd);
1066 tap_update_fd_handler(s);
1072 int tap_disable(NetClientState *nc)
1074 TAPState *s = DO_UPCAST(TAPState, nc, nc);
1077 if (s->enabled == 0) {
1080 ret = tap_fd_disable(s->fd);
1082 qemu_purge_queued_packets(nc);
1084 tap_update_fd_handler(s);