2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
19 #include <sys/types.h>
21 #include <sys/socket.h>
24 #include <linux/if_tun.h>
25 #include <sys/ioctl.h>
26 #include <linux/ethtool.h>
27 #include <linux/sockios.h>
28 #include <sys/eventfd.h>
29 #include <net/if_arp.h>
32 #include <linux/netlink.h>
33 #include <linux/rtnetlink.h>
35 #include <vlib/vlib.h>
36 #include <vlib/physmem.h>
37 #include <vlib/unix/unix.h>
38 #include <vppinfra/linux/netns.h>
39 #include <vnet/ethernet/ethernet.h>
40 #include <vnet/ip/ip4_packet.h>
41 #include <vnet/ip/ip6_packet.h>
42 #include <vnet/devices/netlink.h>
43 #include <vnet/devices/virtio/virtio.h>
44 #include <vnet/devices/tap/tap.h>
48 #define tap_log_err(dev, f, ...) \
49 vlib_log (VLIB_LOG_LEVEL_ERR, tap_main.log_default, "tap%u: " f, dev->dev_instance, ## __VA_ARGS__)
50 #define tap_log_dbg(dev, f, ...) \
51 vlib_log (VLIB_LOG_LEVEL_DEBUG, tap_main.log_default, "tap%u: " f, dev->dev_instance, ## __VA_ARGS__)
53 #define _IOCTL(fd,a,...) \
54 if (ioctl (fd, a, __VA_ARGS__) < 0) \
56 err = clib_error_return_unix (0, "ioctl(" #a ")"); \
57 tap_log_err (vif, "%U", format_clib_error, err); \
62 VNET_HW_INTERFACE_CLASS (tun_device_hw_interface_class, static) =
65 .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
69 #define TUN_MAX_PACKET_BYTES 65355
70 #define TUN_MIN_PACKET_BYTES 64
71 #define TUN_DEFAULT_PACKET_BYTES 1500
74 virtio_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi,
78 //TODO On MTU change call vnet_netlink_set_if_mtu
82 #define TAP_MAX_INSTANCE 1024
85 tap_free (vlib_main_t * vm, virtio_if_t * vif)
87 virtio_main_t *mm = &virtio_main;
88 tap_main_t *tm = &tap_main;
89 clib_error_t *err = 0;
93 vec_foreach_index (i, vif->vhost_fds) if (vif->vhost_fds[i] != -1)
94 close (vif->vhost_fds[i]);
95 vec_foreach_index (i, vif->rxq_vrings)
96 virtio_vring_free_rx (vm, vif, RX_QUEUE (i));
97 vec_foreach_index (i, vif->txq_vrings)
98 virtio_vring_free_tx (vm, vif, TX_QUEUE (i));
103 _IOCTL (vif->tap_fds[0], TUNSETPERSIST, (void *) (uintptr_t) 0);
104 tap_log_dbg (vif, "TUNSETPERSIST: unset");
107 vec_foreach_index (i, vif->tap_fds) close (vif->tap_fds[i]);
109 vec_free (vif->vhost_fds);
110 vec_free (vif->rxq_vrings);
111 vec_free (vif->txq_vrings);
112 vec_free (vif->host_if_name);
113 vec_free (vif->net_ns);
114 vec_free (vif->host_bridge);
115 clib_error_free (vif->error);
117 tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 0);
118 clib_memset (vif, 0, sizeof (*vif));
119 pool_put (mm->interfaces, vif);
123 tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args)
125 vlib_thread_main_t *thm = vlib_get_thread_main ();
126 vlib_physmem_main_t *vpm = &vm->physmem_main;
127 vnet_main_t *vnm = vnet_get_main ();
128 virtio_main_t *vim = &virtio_main;
129 tap_main_t *tm = &tap_main;
130 vnet_sw_interface_t *sw;
131 vnet_hw_interface_t *hw;
132 int i, num_vhost_queues;
133 int old_netns_fd = -1;
134 struct ifreq ifr = {.ifr_flags = IFF_NO_PI | IFF_VNET_HDR };
135 struct ifreq get_ifr = {.ifr_flags = 0 };
137 vhost_memory_t *vhost_mem = 0;
138 virtio_if_t *vif = 0;
139 clib_error_t *err = 0;
140 unsigned int tap_features;
141 int tfd = -1, qfd = -1, vfd = -1, nfd = -1;
142 char *host_if_name = 0;
143 unsigned int offload = 0;
148 if (clib_bitmap_get (tm->tap_ids, args->id))
150 args->rv = VNET_API_ERROR_INVALID_INTERFACE;
151 args->error = clib_error_return (0, "interface already exists");
157 args->id = clib_bitmap_first_clear (tm->tap_ids);
160 if (args->id > TAP_MAX_INSTANCE)
162 args->rv = VNET_API_ERROR_UNSPECIFIED;
163 args->error = clib_error_return (0, "cannot find free interface id");
167 pool_get_zero (vim->interfaces, vif);
169 if (args->tap_flags & TAP_FLAG_TUN)
171 vif->type = VIRTIO_IF_TYPE_TUN;
172 ifr.ifr_flags |= IFF_TUN;
175 * From kernel 4.20, xdp support has been added in tun_sendmsg.
176 * If sndbuf == INT_MAX, vhost batches the packet and processes
177 * them using xdp data path for tun driver. It assumes packets
178 * are ethernet frames (It needs to be fixed).
179 * To avoid xdp data path in tun driver, sndbuf value should
182 sndbuf = INT_MAX - 1;
186 vif->type = VIRTIO_IF_TYPE_TAP;
187 ifr.ifr_flags |= IFF_TAP;
191 vif->dev_instance = vif - vim->interfaces;
193 vif->num_txqs = thm->n_vlib_mains;
194 vif->num_rxqs = clib_max (args->num_rx_queues, 1);
196 if (args->tap_flags & TAP_FLAG_ATTACH)
198 if (args->host_if_name != NULL)
200 host_if_name = (char *) args->host_if_name;
201 clib_memcpy (ifr.ifr_name, host_if_name,
202 clib_min (IFNAMSIZ, vec_len (host_if_name)));
206 args->rv = VNET_API_ERROR_NO_MATCHING_INTERFACE;
207 err = clib_error_return (0, "host_if_name is not provided");
210 if (args->host_namespace)
212 old_netns_fd = clib_netns_open (NULL /* self */);
213 if ((nfd = clib_netns_open (args->host_namespace)) == -1)
215 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
216 args->error = clib_error_return_unix (0, "clib_netns_open '%s'",
217 args->host_namespace);
220 if (clib_setns (nfd) == -1)
222 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
223 args->error = clib_error_return_unix (0, "setns '%s'",
224 args->host_namespace);
230 if ((tfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
232 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
233 args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
236 vec_add1 (vif->tap_fds, tfd);
237 tap_log_dbg (vif, "open tap fd %d", tfd);
239 _IOCTL (tfd, TUNGETFEATURES, &tap_features);
240 tap_log_dbg (vif, "TUNGETFEATURES: features 0x%lx", tap_features);
241 if ((tap_features & IFF_VNET_HDR) == 0)
243 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
244 args->error = clib_error_return (0, "vhost-net backend not available");
248 if ((tap_features & IFF_MULTI_QUEUE) == 0)
250 if (vif->num_rxqs > 1)
252 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
253 args->error = clib_error_return (0, "multiqueue not supported");
256 vif->num_rxqs = vif->num_txqs = 1;
259 ifr.ifr_flags |= IFF_MULTI_QUEUE;
261 hdrsz = sizeof (virtio_net_hdr_v1_t);
262 if (args->tap_flags & TAP_FLAG_GSO)
264 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
265 vif->gso_enabled = 1;
267 else if (args->tap_flags & TAP_FLAG_CSUM_OFFLOAD)
269 offload = TUN_F_CSUM;
270 vif->csum_offload_enabled = 1;
273 _IOCTL (tfd, TUNSETIFF, (void *) &ifr);
274 tap_log_dbg (vif, "TUNSETIFF fd %d name %s flags 0x%x", tfd,
275 ifr.ifr_ifrn.ifrn_name, ifr.ifr_flags);
277 vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name);
278 tap_log_dbg (vif, "ifindex %d", vif->ifindex);
280 if (!args->host_if_name)
281 host_if_name = ifr.ifr_ifrn.ifrn_name;
283 host_if_name = (char *) args->host_if_name;
286 * unset the persistence when attaching to existing
289 if (args->tap_flags & TAP_FLAG_ATTACH)
291 _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 0);
292 tap_log_dbg (vif, "TUNSETPERSIST: unset");
295 /* set the persistence */
296 if (args->tap_flags & TAP_FLAG_PERSIST)
298 _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 1);
299 tap_log_dbg (vif, "TUNSETPERSIST: set");
301 /* verify persistence is set, read the flags */
302 _IOCTL (tfd, TUNGETIFF, (void *) &get_ifr);
303 tap_log_dbg (vif, "TUNGETIFF: flags 0x%lx", get_ifr.ifr_flags);
304 if ((get_ifr.ifr_flags & IFF_PERSIST) == 0)
306 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
307 args->error = clib_error_return (0, "persistence not supported");
312 /* create additional queues on the linux side.
313 * we create as many linux queue pairs as we have rx queues
315 for (i = 1; i < vif->num_rxqs; i++)
317 if ((qfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
319 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
320 args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
323 _IOCTL (qfd, TUNSETIFF, (void *) &ifr);
324 tap_log_dbg (vif, "TUNSETIFF fd %d name %s flags 0x%x", qfd,
325 ifr.ifr_ifrn.ifrn_name, ifr.ifr_flags);
326 vec_add1 (vif->tap_fds, qfd);
329 for (i = 0; i < vif->num_rxqs; i++)
331 tap_log_dbg (vif, "TUNSETVNETHDRSZ: fd %d vnet_hdr_sz %u",
332 vif->tap_fds[i], hdrsz);
333 _IOCTL (vif->tap_fds[i], TUNSETVNETHDRSZ, &hdrsz);
335 tap_log_dbg (vif, "TUNSETSNDBUF: fd %d sndbuf %d", vif->tap_fds[i],
337 _IOCTL (vif->tap_fds[i], TUNSETSNDBUF, &sndbuf);
339 tap_log_dbg (vif, "TUNSETOFFLOAD: fd %d offload 0x%lx", vif->tap_fds[i],
341 _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload);
343 if (fcntl (vif->tap_fds[i], F_SETFL, O_NONBLOCK) < 0)
345 err = clib_error_return_unix (0, "fcntl(tfd, F_SETFL, O_NONBLOCK)");
346 tap_log_err (vif, "set nonblocking: %U", format_clib_error, err);
351 /* open as many vhost-net fds as required and set ownership */
352 num_vhost_queues = clib_max (vif->num_rxqs, vif->num_txqs);
353 for (i = 0; i < num_vhost_queues; i++)
355 if ((vfd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
357 args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
358 args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
361 vec_add1 (vif->vhost_fds, vfd);
362 virtio_log_debug (vif, "open vhost-net fd %d qpair %u", vfd, i);
363 _IOCTL (vfd, VHOST_SET_OWNER, 0);
364 virtio_log_debug (vif, "VHOST_SET_OWNER: fd %u", vfd);
367 _IOCTL (vif->vhost_fds[0], VHOST_GET_FEATURES, &vif->remote_features);
368 virtio_log_debug (vif, "VHOST_GET_FEATURES: features 0x%lx",
369 vif->remote_features);
371 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)) == 0)
373 args->rv = VNET_API_ERROR_UNSUPPORTED;
374 args->error = clib_error_return (0, "vhost-net backend doesn't support "
375 "VIRTIO_NET_F_MRG_RXBUF feature");
379 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) ==
382 args->rv = VNET_API_ERROR_UNSUPPORTED;
383 args->error = clib_error_return (0, "vhost-net backend doesn't support "
384 "VIRTIO_RING_F_INDIRECT_DESC feature");
388 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_F_VERSION_1)) == 0)
390 args->rv = VNET_API_ERROR_UNSUPPORTED;
391 args->error = clib_error_return (0, "vhost-net backend doesn't support "
392 "VIRTIO_F_VERSION_1 features");
396 vif->features |= VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF);
397 vif->features |= VIRTIO_FEATURE (VIRTIO_F_VERSION_1);
398 vif->features |= VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC);
400 virtio_set_net_hdr_size (vif);
402 if (!(args->tap_flags & TAP_FLAG_ATTACH))
404 /* if namespace is specified, all further netlink messages should be executed
405 after we change our net namespace */
406 if (args->host_namespace)
408 old_netns_fd = clib_netns_open (NULL /* self */);
409 if ((nfd = clib_netns_open (args->host_namespace)) == -1)
411 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
412 args->error = clib_error_return_unix (0, "clib_netns_open '%s'",
413 args->host_namespace);
416 args->error = vnet_netlink_set_link_netns (vif->ifindex, nfd,
420 args->rv = VNET_API_ERROR_NETLINK_ERROR;
423 if (clib_setns (nfd) == -1)
425 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
426 args->error = clib_error_return_unix (0, "setns '%s'",
427 args->host_namespace);
430 if ((vif->ifindex = if_nametoindex (host_if_name)) == 0)
432 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
433 args->error = clib_error_return_unix (0, "if_nametoindex '%s'",
438 else if (host_if_name)
441 vnet_netlink_set_link_name (vif->ifindex, host_if_name);
444 args->rv = VNET_API_ERROR_NETLINK_ERROR;
450 if (vif->type == VIRTIO_IF_TYPE_TAP)
452 if (ethernet_mac_address_is_zero (args->host_mac_addr.bytes))
453 ethernet_mac_address_generate (args->host_mac_addr.bytes);
454 args->error = vnet_netlink_set_link_addr (vif->ifindex,
455 args->host_mac_addr.bytes);
458 args->rv = VNET_API_ERROR_NETLINK_ERROR;
462 if (args->host_bridge)
464 args->error = vnet_netlink_set_link_master (vif->ifindex,
469 args->rv = VNET_API_ERROR_NETLINK_ERROR;
475 if (args->host_ip4_prefix_len)
477 args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
478 &args->host_ip4_addr,
479 args->host_ip4_prefix_len);
482 args->rv = VNET_API_ERROR_NETLINK_ERROR;
487 if (args->host_ip6_prefix_len)
489 args->error = vnet_netlink_add_ip6_addr (vif->ifindex,
490 &args->host_ip6_addr,
491 args->host_ip6_prefix_len);
494 args->rv = VNET_API_ERROR_NETLINK_ERROR;
499 args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ );
502 args->rv = VNET_API_ERROR_NETLINK_ERROR;
506 if (args->host_ip4_gw_set)
508 args->error = vnet_netlink_add_ip4_route (0, 0, &args->host_ip4_gw);
511 args->rv = VNET_API_ERROR_NETLINK_ERROR;
516 if (args->host_ip6_gw_set)
518 args->error = vnet_netlink_add_ip6_route (0, 0, &args->host_ip6_gw);
521 args->rv = VNET_API_ERROR_NETLINK_ERROR;
526 if (args->host_mtu_set)
529 vnet_netlink_set_link_mtu (vif->ifindex, args->host_mtu_size);
532 args->rv = VNET_API_ERROR_NETLINK_ERROR;
536 else if (tm->host_mtu_size != 0)
539 vnet_netlink_set_link_mtu (vif->ifindex, tm->host_mtu_size);
542 args->rv = VNET_API_ERROR_NETLINK_ERROR;
545 args->host_mtu_set = 1;
546 args->host_mtu_size = tm->host_mtu_size;
549 /* switch back to old net namespace */
550 if (args->host_namespace)
552 if (clib_setns (old_netns_fd) == -1)
554 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
555 args->error = clib_error_return_unix (0, "setns '%s'",
556 args->host_namespace);
561 for (i = 0; i < num_vhost_queues; i++)
563 if (i < vif->num_rxqs && (args->error =
564 virtio_vring_init (vm, vif, RX_QUEUE (i),
567 args->rv = VNET_API_ERROR_INIT_FAILED;
571 if (i < vif->num_txqs && (args->error =
572 virtio_vring_init (vm, vif, TX_QUEUE (i),
575 args->rv = VNET_API_ERROR_INIT_FAILED;
580 /* setup features and memtable */
581 i = sizeof (vhost_memory_t) + sizeof (vhost_memory_region_t);
582 vhost_mem = clib_mem_alloc (i);
583 clib_memset (vhost_mem, 0, i);
584 vhost_mem->nregions = 1;
585 vhost_mem->regions[0].memory_size = vpm->max_size;
586 vhost_mem->regions[0].guest_phys_addr = vpm->base_addr;
587 vhost_mem->regions[0].userspace_addr =
588 vhost_mem->regions[0].guest_phys_addr;
590 for (i = 0; i < vhost_mem->nregions; i++)
591 virtio_log_debug (vif, "memtable region %u memory_size 0x%lx "
592 "guest_phys_addr 0x%lx userspace_addr 0x%lx", i,
593 vhost_mem->regions[0].memory_size,
594 vhost_mem->regions[0].guest_phys_addr,
595 vhost_mem->regions[0].userspace_addr);
598 for (i = 0; i < num_vhost_queues; i++)
600 int fd = vif->vhost_fds[i];
601 _IOCTL (fd, VHOST_SET_FEATURES, &vif->features);
602 virtio_log_debug (vif, "VHOST_SET_FEATURES: fd %u features 0x%lx",
604 _IOCTL (fd, VHOST_SET_MEM_TABLE, vhost_mem);
605 virtio_log_debug (vif, "VHOST_SET_MEM_TABLE: fd %u", fd);
608 /* finish initializing queue pair */
609 for (i = 0; i < num_vhost_queues * 2; i++)
611 vhost_vring_addr_t addr = { 0 };
612 vhost_vring_state_t state = { 0 };
613 vhost_vring_file_t file = { 0 };
614 virtio_vring_t *vring;
616 int fd = vif->vhost_fds[qp];
620 if (qp >= vif->num_txqs)
622 vring = vec_elt_at_index (vif->txq_vrings, qp);
626 if (qp >= vif->num_rxqs)
628 vring = vec_elt_at_index (vif->rxq_vrings, qp);
631 addr.index = state.index = file.index = vring->queue_id & 1;
632 state.num = vring->size;
633 virtio_log_debug (vif, "VHOST_SET_VRING_NUM fd %d index %u num %u", fd,
634 state.index, state.num);
635 _IOCTL (fd, VHOST_SET_VRING_NUM, &state);
638 addr.desc_user_addr = pointer_to_uword (vring->desc);
639 addr.avail_user_addr = pointer_to_uword (vring->avail);
640 addr.used_user_addr = pointer_to_uword (vring->used);
642 virtio_log_debug (vif, "VHOST_SET_VRING_ADDR fd %d index %u flags 0x%x "
643 "desc_user_addr 0x%lx avail_user_addr 0x%lx "
644 "used_user_addr 0x%lx", fd, addr.index,
645 addr.flags, addr.desc_user_addr, addr.avail_user_addr,
646 addr.used_user_addr);
647 _IOCTL (fd, VHOST_SET_VRING_ADDR, &addr);
649 file.fd = vring->call_fd;
650 virtio_log_debug (vif, "VHOST_SET_VRING_CALL fd %d index %u call_fd %d",
651 fd, file.index, file.fd);
652 _IOCTL (fd, VHOST_SET_VRING_CALL, &file);
654 file.fd = vring->kick_fd;
655 virtio_log_debug (vif, "VHOST_SET_VRING_KICK fd %d index %u kick_fd %d",
656 fd, file.index, file.fd);
657 _IOCTL (fd, VHOST_SET_VRING_KICK, &file);
659 file.fd = vif->tap_fds[qp % vif->num_rxqs];
660 virtio_log_debug (vif, "VHOST_NET_SET_BACKEND fd %d index %u tap_fd %d",
661 fd, file.index, file.fd);
662 _IOCTL (fd, VHOST_NET_SET_BACKEND, &file);
665 if (vif->type == VIRTIO_IF_TYPE_TAP)
667 if (!args->mac_addr_set)
668 ethernet_mac_address_generate (args->mac_addr.bytes);
670 clib_memcpy (vif->mac_addr, args->mac_addr.bytes, 6);
671 vif->host_bridge = format (0, "%s%c", args->host_bridge, 0);
673 vif->host_if_name = format (0, "%s%c", host_if_name, 0);
674 vif->net_ns = format (0, "%s%c", args->host_namespace, 0);
675 vif->host_mtu_size = args->host_mtu_size;
676 vif->tap_flags = args->tap_flags;
677 clib_memcpy (vif->host_mac_addr, args->host_mac_addr.bytes, 6);
678 vif->host_ip4_prefix_len = args->host_ip4_prefix_len;
679 vif->host_ip6_prefix_len = args->host_ip6_prefix_len;
680 if (args->host_ip4_prefix_len)
681 clib_memcpy (&vif->host_ip4_addr, &args->host_ip4_addr, 4);
682 if (args->host_ip6_prefix_len)
683 clib_memcpy (&vif->host_ip6_addr, &args->host_ip6_addr, 16);
685 if (vif->type != VIRTIO_IF_TYPE_TUN)
688 ethernet_register_interface (vnm, virtio_device_class.index,
689 vif->dev_instance, vif->mac_addr,
691 virtio_eth_flag_change);
694 args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
701 vif->hw_if_index = vnet_register_interface
702 (vnm, virtio_device_class.index,
703 vif->dev_instance /* device instance */ ,
704 tun_device_hw_interface_class.index, vif->dev_instance);
707 tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 1);
708 sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
709 vif->sw_if_index = sw->sw_if_index;
710 args->sw_if_index = vif->sw_if_index;
712 hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
713 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_INT_MODE;
714 if (args->tap_flags & TAP_FLAG_GSO)
716 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO |
717 VNET_HW_INTERFACE_CAP_SUPPORTS_TX_TCP_CKSUM |
718 VNET_HW_INTERFACE_CAP_SUPPORTS_TX_UDP_CKSUM;
720 else if (args->tap_flags & TAP_FLAG_CSUM_OFFLOAD)
722 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_TX_TCP_CKSUM |
723 VNET_HW_INTERFACE_CAP_SUPPORTS_TX_UDP_CKSUM;
725 if ((args->tap_flags & TAP_FLAG_GSO)
726 && (args->tap_flags & TAP_FLAG_GRO_COALESCE))
728 virtio_set_packet_coalesce (vif);
730 if (vif->type == VIRTIO_IF_TYPE_TUN)
732 hw->max_supported_packet_bytes = TUN_MAX_PACKET_BYTES;
733 hw->min_packet_bytes = hw->min_supported_packet_bytes =
734 TUN_MIN_PACKET_BYTES;
735 hw->max_packet_bytes =
736 args->host_mtu_size ? args->host_mtu_size : TUN_DEFAULT_PACKET_BYTES;
737 vnet_sw_interface_set_mtu (vnm, hw->sw_if_index, hw->max_packet_bytes);
740 virtio_vring_set_rx_queues (vm, vif);
742 vif->per_interface_next_index = ~0;
743 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
744 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
745 VNET_HW_INTERFACE_FLAG_LINK_UP);
747 * Host tun/tap driver link carrier state is "up" at creation. The
748 * driver never changes this unless the backend (VPP) changes it using
749 * TUNSETCARRIER ioctl(). See tap_set_carrier().
751 vif->host_carrier_up = 1;
752 vif->cxq_vring = NULL;
759 ASSERT (args->error == 0);
761 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
764 tap_log_err (vif, "%U", format_clib_error, args->error);
768 clib_mem_free (vhost_mem);
769 if (old_netns_fd != -1)
770 close (old_netns_fd);
776 tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
778 vnet_main_t *vnm = vnet_get_main ();
779 virtio_main_t *mm = &virtio_main;
781 vnet_hw_interface_t *hw;
783 hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index);
784 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
785 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
787 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
789 if ((vif->type != VIRTIO_IF_TYPE_TAP) && (vif->type != VIRTIO_IF_TYPE_TUN))
790 return VNET_API_ERROR_INVALID_INTERFACE;
792 /* bring down the interface */
793 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
794 vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0);
796 if (vif->type == VIRTIO_IF_TYPE_TAP)
797 ethernet_delete_interface (vnm, vif->hw_if_index);
798 else /* VIRTIO_IF_TYPE_TUN */
799 vnet_delete_hw_interface (vnm, vif->hw_if_index);
800 vif->hw_if_index = ~0;
808 tap_csum_offload_enable_disable (vlib_main_t * vm, u32 sw_if_index,
811 vnet_main_t *vnm = vnet_get_main ();
812 virtio_main_t *mm = &virtio_main;
814 vnet_hw_interface_t *hw;
815 clib_error_t *err = 0;
818 hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index);
820 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
821 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
823 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
825 const unsigned int csum_offload_on = TUN_F_CSUM;
826 const unsigned int csum_offload_off = 0;
827 unsigned int offload = enable_disable ? csum_offload_on : csum_offload_off;
828 vec_foreach_index (i, vif->tap_fds)
829 _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload);
830 vif->gso_enabled = 0;
831 vif->packet_coalesce = 0;
832 vif->csum_offload_enabled = enable_disable ? 1 : 0;
834 if ((hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO) != 0)
836 hw->caps &= ~VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO;
841 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM;
845 hw->caps &= ~VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM;
851 clib_warning ("Error %s checksum offload on sw_if_index %d",
852 enable_disable ? "enabling" : "disabling", sw_if_index);
853 return VNET_API_ERROR_SYSCALL_ERROR_3;
859 tap_gso_enable_disable (vlib_main_t * vm, u32 sw_if_index, int enable_disable,
860 int is_packet_coalesce)
862 vnet_main_t *vnm = vnet_get_main ();
863 virtio_main_t *mm = &virtio_main;
865 vnet_hw_interface_t *hw;
866 clib_error_t *err = 0;
869 hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index);
871 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
872 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
874 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
876 const unsigned int gso_on = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
877 const unsigned int gso_off = 0;
878 unsigned int offload = enable_disable ? gso_on : gso_off;
879 vec_foreach_index (i, vif->tap_fds)
880 _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload);
881 vif->gso_enabled = enable_disable ? 1 : 0;
882 vif->csum_offload_enabled = 0;
885 if ((hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO) == 0)
887 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO |
888 VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM;
890 if (is_packet_coalesce)
892 virtio_set_packet_coalesce (vif);
897 if ((hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO) != 0)
899 hw->caps &= ~(VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO |
900 VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM);
902 vif->packet_coalesce = 0;
908 clib_warning ("Error %s gso on sw_if_index %d",
909 enable_disable ? "enabling" : "disabling", sw_if_index);
910 return VNET_API_ERROR_SYSCALL_ERROR_3;
916 tap_dump_ifs (tap_interface_details_t ** out_tapids)
918 vnet_main_t *vnm = vnet_get_main ();
919 virtio_main_t *mm = &virtio_main;
921 virtio_vring_t *vring;
922 vnet_hw_interface_t *hi;
923 tap_interface_details_t *r_tapids = NULL;
924 tap_interface_details_t *tapid = NULL;
927 pool_foreach (vif, mm->interfaces) {
928 if ((vif->type != VIRTIO_IF_TYPE_TAP)
929 && (vif->type != VIRTIO_IF_TYPE_TUN))
931 vec_add2(r_tapids, tapid, 1);
932 clib_memset (tapid, 0, sizeof (*tapid));
934 tapid->sw_if_index = vif->sw_if_index;
935 hi = vnet_get_hw_interface (vnm, vif->hw_if_index);
936 clib_memcpy(tapid->dev_name, hi->name,
937 MIN (ARRAY_LEN (tapid->dev_name) - 1, vec_len (hi->name)));
938 vring = vec_elt_at_index (vif->rxq_vrings, RX_QUEUE_ACCESS(0));
939 tapid->rx_ring_sz = vring->size;
940 vring = vec_elt_at_index (vif->txq_vrings, TX_QUEUE_ACCESS(0));
941 tapid->tx_ring_sz = vring->size;
942 tapid->tap_flags = vif->tap_flags;
943 clib_memcpy(&tapid->host_mac_addr, vif->host_mac_addr, 6);
944 if (vif->host_if_name)
946 clib_memcpy(tapid->host_if_name, vif->host_if_name,
947 MIN (ARRAY_LEN (tapid->host_if_name) - 1,
948 vec_len (vif->host_if_name)));
952 clib_memcpy(tapid->host_namespace, vif->net_ns,
953 MIN (ARRAY_LEN (tapid->host_namespace) - 1,
954 vec_len (vif->net_ns)));
956 if (vif->host_bridge)
958 clib_memcpy(tapid->host_bridge, vif->host_bridge,
959 MIN (ARRAY_LEN (tapid->host_bridge) - 1,
960 vec_len (vif->host_bridge)));
962 if (vif->host_ip4_prefix_len)
963 clib_memcpy(tapid->host_ip4_addr.as_u8, &vif->host_ip4_addr, 4);
964 tapid->host_ip4_prefix_len = vif->host_ip4_prefix_len;
965 if (vif->host_ip6_prefix_len)
966 clib_memcpy(tapid->host_ip6_addr.as_u8, &vif->host_ip6_addr, 16);
967 tapid->host_ip6_prefix_len = vif->host_ip6_prefix_len;
968 tapid->host_mtu_size = vif->host_mtu_size;
972 *out_tapids = r_tapids;
978 * Set host tap/tun interface carrier state so it will appear to host
979 * applications that the interface's link state changed.
981 * If the kernel we're building against does not have support for the
982 * TUNSETCARRIER ioctl command, do nothing.
985 tap_set_carrier (u32 hw_if_index, u32 carrier_up)
989 vnet_main_t *vnm = vnet_get_main ();
990 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
991 virtio_main_t *mm = &virtio_main;
995 vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
996 vec_foreach (fd, vif->tap_fds)
998 ret = ioctl (*fd, TUNSETCARRIER, &carrier_up);
1001 clib_warning ("ioctl (TUNSETCARRIER) returned %d", ret);
1006 vif->host_carrier_up = (carrier_up != 0);
1012 static clib_error_t *
1013 tap_mtu_config (vlib_main_t * vm, unformat_input_t * input)
1015 tap_main_t *tm = &tap_main;
1017 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
1019 if (unformat (input, "host-mtu %d", &tm->host_mtu_size))
1022 return clib_error_return (0, "unknown input `%U'",
1023 format_unformat_error, input);
1030 * Set host tap/tun interface speed in Mbps.
1033 tap_set_speed (u32 hw_if_index, u32 speed)
1035 vnet_main_t *vnm = vnet_get_main ();
1036 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
1037 virtio_main_t *mm = &virtio_main;
1039 int old_netns_fd = -1;
1043 struct ethtool_cmd ecmd;
1046 vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
1050 old_netns_fd = clib_netns_open (NULL /* self */);
1051 if ((nfd = clib_netns_open (vif->net_ns)) == -1)
1053 clib_warning ("Cannot open netns");
1056 if (clib_setns (nfd) == -1)
1058 clib_warning ("Cannot set ns");
1063 if ((ctl_fd = socket (AF_INET, SOCK_STREAM, 0)) == -1)
1065 clib_warning ("Cannot open control socket");
1069 ecmd.cmd = ETHTOOL_GSET;
1070 clib_memset (&ifr, 0, sizeof (ifr));
1071 clib_memcpy (ifr.ifr_name, vif->host_if_name,
1072 strlen ((const char *) vif->host_if_name));
1073 ifr.ifr_data = (void *) &ecmd;
1074 if ((ret = ioctl (ctl_fd, SIOCETHTOOL, &ifr)) < 0)
1076 clib_warning ("Cannot get device settings");
1080 if (ethtool_cmd_speed (&ecmd) != speed)
1082 ecmd.cmd = ETHTOOL_SSET;
1083 ethtool_cmd_speed_set (&ecmd, speed);
1084 if ((ret = ioctl (ctl_fd, SIOCETHTOOL, &ifr)) < 0)
1086 clib_warning ("Cannot set device settings");
1092 if (old_netns_fd != -1)
1094 if (clib_setns (old_netns_fd) == -1)
1096 clib_warning ("Cannot set old ns");
1098 close (old_netns_fd);
1108 /* tap { host-mtu <size> } configuration. */
1109 VLIB_CONFIG_FUNCTION (tap_mtu_config, "tap");
1111 static clib_error_t *
1112 tap_init (vlib_main_t * vm)
1114 tap_main_t *tm = &tap_main;
1115 clib_error_t *error = 0;
1117 tm->log_default = vlib_log_register_class ("tap", 0);
1118 vlib_log_debug (tm->log_default, "initialized");
1120 tm->host_mtu_size = 0;
1125 VLIB_INIT_FUNCTION (tap_init);
1128 * fd.io coding-style-patch-verification: ON
1131 * eval: (c-set-style "gnu")