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 args->rv = VNET_API_ERROR_NO_MATCHING_INTERFACE;
201 err = clib_error_return (0, "host_if_name is not provided");
206 /* if namespace is specified, all further netlink messages should be executed
207 * after we change our net namespace */
208 if (args->host_namespace)
210 old_netns_fd = clib_netns_open (NULL /* self */);
211 if ((nfd = clib_netns_open (args->host_namespace)) == -1)
213 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
214 args->error = clib_error_return_unix (0, "clib_netns_open '%s'",
215 args->host_namespace);
218 if (clib_setns (nfd) == -1)
220 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
222 clib_error_return_unix (0, "setns '%s'", args->host_namespace);
227 if (args->host_if_name != NULL)
229 host_if_name = (char *) args->host_if_name;
230 clib_memcpy (ifr.ifr_name, host_if_name,
231 clib_min (IFNAMSIZ, vec_len (host_if_name)));
234 if ((tfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
236 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
237 args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
240 vec_add1 (vif->tap_fds, tfd);
241 tap_log_dbg (vif, "open tap fd %d", tfd);
243 _IOCTL (tfd, TUNGETFEATURES, &tap_features);
244 tap_log_dbg (vif, "TUNGETFEATURES: features 0x%lx", tap_features);
245 if ((tap_features & IFF_VNET_HDR) == 0)
247 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
248 args->error = clib_error_return (0, "vhost-net backend not available");
252 if ((tap_features & IFF_MULTI_QUEUE) == 0)
254 if (vif->num_rxqs > 1)
256 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
257 args->error = clib_error_return (0, "multiqueue not supported");
260 vif->num_rxqs = vif->num_txqs = 1;
263 ifr.ifr_flags |= IFF_MULTI_QUEUE;
265 hdrsz = sizeof (virtio_net_hdr_v1_t);
266 if (args->tap_flags & TAP_FLAG_GSO)
268 offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
269 vif->gso_enabled = 1;
271 else if (args->tap_flags & TAP_FLAG_CSUM_OFFLOAD)
273 offload = TUN_F_CSUM;
274 vif->csum_offload_enabled = 1;
277 _IOCTL (tfd, TUNSETIFF, (void *) &ifr);
278 tap_log_dbg (vif, "TUNSETIFF fd %d name %s flags 0x%x", tfd,
279 ifr.ifr_ifrn.ifrn_name, ifr.ifr_flags);
281 vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name);
282 tap_log_dbg (vif, "ifindex %d", vif->ifindex);
284 if (!args->host_if_name)
285 host_if_name = ifr.ifr_ifrn.ifrn_name;
287 host_if_name = (char *) args->host_if_name;
290 * unset the persistence when attaching to existing
293 if (args->tap_flags & TAP_FLAG_ATTACH)
295 _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 0);
296 tap_log_dbg (vif, "TUNSETPERSIST: unset");
299 /* set the persistence */
300 if (args->tap_flags & TAP_FLAG_PERSIST)
302 _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 1);
303 tap_log_dbg (vif, "TUNSETPERSIST: set");
305 /* verify persistence is set, read the flags */
306 _IOCTL (tfd, TUNGETIFF, (void *) &get_ifr);
307 tap_log_dbg (vif, "TUNGETIFF: flags 0x%lx", get_ifr.ifr_flags);
308 if ((get_ifr.ifr_flags & IFF_PERSIST) == 0)
310 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
311 args->error = clib_error_return (0, "persistence not supported");
316 /* create additional queues on the linux side.
317 * we create as many linux queue pairs as we have rx queues
319 for (i = 1; i < vif->num_rxqs; i++)
321 if ((qfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
323 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
324 args->error = clib_error_return_unix (0, "open '/dev/net/tun'");
327 _IOCTL (qfd, TUNSETIFF, (void *) &ifr);
328 tap_log_dbg (vif, "TUNSETIFF fd %d name %s flags 0x%x", qfd,
329 ifr.ifr_ifrn.ifrn_name, ifr.ifr_flags);
330 vec_add1 (vif->tap_fds, qfd);
333 for (i = 0; i < vif->num_rxqs; i++)
335 tap_log_dbg (vif, "TUNSETVNETHDRSZ: fd %d vnet_hdr_sz %u",
336 vif->tap_fds[i], hdrsz);
337 _IOCTL (vif->tap_fds[i], TUNSETVNETHDRSZ, &hdrsz);
339 tap_log_dbg (vif, "TUNSETSNDBUF: fd %d sndbuf %d", vif->tap_fds[i],
341 _IOCTL (vif->tap_fds[i], TUNSETSNDBUF, &sndbuf);
343 tap_log_dbg (vif, "TUNSETOFFLOAD: fd %d offload 0x%lx", vif->tap_fds[i],
345 _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload);
347 if (fcntl (vif->tap_fds[i], F_SETFL, O_NONBLOCK) < 0)
349 err = clib_error_return_unix (0, "fcntl(tfd, F_SETFL, O_NONBLOCK)");
350 tap_log_err (vif, "set nonblocking: %U", format_clib_error, err);
355 /* open as many vhost-net fds as required and set ownership */
356 num_vhost_queues = clib_max (vif->num_rxqs, vif->num_txqs);
357 for (i = 0; i < num_vhost_queues; i++)
359 if ((vfd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0)
361 args->rv = VNET_API_ERROR_SYSCALL_ERROR_1;
362 args->error = clib_error_return_unix (0, "open '/dev/vhost-net'");
365 vec_add1 (vif->vhost_fds, vfd);
366 virtio_log_debug (vif, "open vhost-net fd %d qpair %u", vfd, i);
367 _IOCTL (vfd, VHOST_SET_OWNER, 0);
368 virtio_log_debug (vif, "VHOST_SET_OWNER: fd %u", vfd);
371 _IOCTL (vif->vhost_fds[0], VHOST_GET_FEATURES, &vif->remote_features);
372 virtio_log_debug (vif, "VHOST_GET_FEATURES: features 0x%lx",
373 vif->remote_features);
375 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)) == 0)
377 args->rv = VNET_API_ERROR_UNSUPPORTED;
378 args->error = clib_error_return (0, "vhost-net backend doesn't support "
379 "VIRTIO_NET_F_MRG_RXBUF feature");
383 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) ==
386 args->rv = VNET_API_ERROR_UNSUPPORTED;
387 args->error = clib_error_return (0, "vhost-net backend doesn't support "
388 "VIRTIO_RING_F_INDIRECT_DESC feature");
392 if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_F_VERSION_1)) == 0)
394 args->rv = VNET_API_ERROR_UNSUPPORTED;
395 args->error = clib_error_return (0, "vhost-net backend doesn't support "
396 "VIRTIO_F_VERSION_1 features");
400 vif->features |= VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF);
401 vif->features |= VIRTIO_FEATURE (VIRTIO_F_VERSION_1);
402 vif->features |= VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC);
404 virtio_set_net_hdr_size (vif);
406 if (vif->type == VIRTIO_IF_TYPE_TAP)
408 if (ethernet_mac_address_is_zero (args->host_mac_addr.bytes))
409 ethernet_mac_address_generate (args->host_mac_addr.bytes);
410 args->error = vnet_netlink_set_link_addr (vif->ifindex,
411 args->host_mac_addr.bytes);
414 args->rv = VNET_API_ERROR_NETLINK_ERROR;
418 if (args->host_bridge)
420 args->error = vnet_netlink_set_link_master (vif->ifindex,
425 args->rv = VNET_API_ERROR_NETLINK_ERROR;
431 if (args->host_ip4_prefix_len)
433 args->error = vnet_netlink_add_ip4_addr (vif->ifindex,
434 &args->host_ip4_addr,
435 args->host_ip4_prefix_len);
438 args->rv = VNET_API_ERROR_NETLINK_ERROR;
443 if (args->host_ip6_prefix_len)
445 args->error = vnet_netlink_add_ip6_addr (vif->ifindex,
446 &args->host_ip6_addr,
447 args->host_ip6_prefix_len);
450 args->rv = VNET_API_ERROR_NETLINK_ERROR;
455 args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ );
458 args->rv = VNET_API_ERROR_NETLINK_ERROR;
462 if (args->host_ip4_gw_set)
464 args->error = vnet_netlink_add_ip4_route (0, 0, &args->host_ip4_gw);
467 args->rv = VNET_API_ERROR_NETLINK_ERROR;
472 if (args->host_ip6_gw_set)
474 args->error = vnet_netlink_add_ip6_route (0, 0, &args->host_ip6_gw);
477 args->rv = VNET_API_ERROR_NETLINK_ERROR;
482 if (args->host_mtu_set)
485 vnet_netlink_set_link_mtu (vif->ifindex, args->host_mtu_size);
488 args->rv = VNET_API_ERROR_NETLINK_ERROR;
492 else if (tm->host_mtu_size != 0)
495 vnet_netlink_set_link_mtu (vif->ifindex, tm->host_mtu_size);
498 args->rv = VNET_API_ERROR_NETLINK_ERROR;
501 args->host_mtu_set = 1;
502 args->host_mtu_size = tm->host_mtu_size;
505 /* switch back to old net namespace */
506 if (args->host_namespace)
508 if (clib_setns (old_netns_fd) == -1)
510 args->rv = VNET_API_ERROR_SYSCALL_ERROR_2;
511 args->error = clib_error_return_unix (0, "setns '%s'",
512 args->host_namespace);
517 for (i = 0; i < num_vhost_queues; i++)
519 if (i < vif->num_rxqs && (args->error =
520 virtio_vring_init (vm, vif, RX_QUEUE (i),
523 args->rv = VNET_API_ERROR_INIT_FAILED;
527 if (i < vif->num_txqs && (args->error =
528 virtio_vring_init (vm, vif, TX_QUEUE (i),
531 args->rv = VNET_API_ERROR_INIT_FAILED;
536 /* setup features and memtable */
537 i = sizeof (vhost_memory_t) + sizeof (vhost_memory_region_t);
538 vhost_mem = clib_mem_alloc (i);
539 clib_memset (vhost_mem, 0, i);
540 vhost_mem->nregions = 1;
541 vhost_mem->regions[0].memory_size = vpm->max_size;
542 vhost_mem->regions[0].guest_phys_addr = vpm->base_addr;
543 vhost_mem->regions[0].userspace_addr =
544 vhost_mem->regions[0].guest_phys_addr;
546 for (i = 0; i < vhost_mem->nregions; i++)
547 virtio_log_debug (vif, "memtable region %u memory_size 0x%lx "
548 "guest_phys_addr 0x%lx userspace_addr 0x%lx", i,
549 vhost_mem->regions[0].memory_size,
550 vhost_mem->regions[0].guest_phys_addr,
551 vhost_mem->regions[0].userspace_addr);
554 for (i = 0; i < num_vhost_queues; i++)
556 int fd = vif->vhost_fds[i];
557 _IOCTL (fd, VHOST_SET_FEATURES, &vif->features);
558 virtio_log_debug (vif, "VHOST_SET_FEATURES: fd %u features 0x%lx",
560 _IOCTL (fd, VHOST_SET_MEM_TABLE, vhost_mem);
561 virtio_log_debug (vif, "VHOST_SET_MEM_TABLE: fd %u", fd);
564 /* finish initializing queue pair */
565 for (i = 0; i < num_vhost_queues * 2; i++)
567 vhost_vring_addr_t addr = { 0 };
568 vhost_vring_state_t state = { 0 };
569 vhost_vring_file_t file = { 0 };
570 virtio_vring_t *vring;
572 int fd = vif->vhost_fds[qp];
576 if (qp >= vif->num_txqs)
578 vring = vec_elt_at_index (vif->txq_vrings, qp);
582 if (qp >= vif->num_rxqs)
584 vring = vec_elt_at_index (vif->rxq_vrings, qp);
587 addr.index = state.index = file.index = vring->queue_id & 1;
588 state.num = vring->size;
589 virtio_log_debug (vif, "VHOST_SET_VRING_NUM fd %d index %u num %u", fd,
590 state.index, state.num);
591 _IOCTL (fd, VHOST_SET_VRING_NUM, &state);
594 addr.desc_user_addr = pointer_to_uword (vring->desc);
595 addr.avail_user_addr = pointer_to_uword (vring->avail);
596 addr.used_user_addr = pointer_to_uword (vring->used);
598 virtio_log_debug (vif, "VHOST_SET_VRING_ADDR fd %d index %u flags 0x%x "
599 "desc_user_addr 0x%lx avail_user_addr 0x%lx "
600 "used_user_addr 0x%lx", fd, addr.index,
601 addr.flags, addr.desc_user_addr, addr.avail_user_addr,
602 addr.used_user_addr);
603 _IOCTL (fd, VHOST_SET_VRING_ADDR, &addr);
605 file.fd = vring->call_fd;
606 virtio_log_debug (vif, "VHOST_SET_VRING_CALL fd %d index %u call_fd %d",
607 fd, file.index, file.fd);
608 _IOCTL (fd, VHOST_SET_VRING_CALL, &file);
610 file.fd = vring->kick_fd;
611 virtio_log_debug (vif, "VHOST_SET_VRING_KICK fd %d index %u kick_fd %d",
612 fd, file.index, file.fd);
613 _IOCTL (fd, VHOST_SET_VRING_KICK, &file);
615 file.fd = vif->tap_fds[qp % vif->num_rxqs];
616 virtio_log_debug (vif, "VHOST_NET_SET_BACKEND fd %d index %u tap_fd %d",
617 fd, file.index, file.fd);
618 _IOCTL (fd, VHOST_NET_SET_BACKEND, &file);
621 if (vif->type == VIRTIO_IF_TYPE_TAP)
623 if (!args->mac_addr_set)
624 ethernet_mac_address_generate (args->mac_addr.bytes);
626 clib_memcpy (vif->mac_addr, args->mac_addr.bytes, 6);
627 vif->host_bridge = format (0, "%s%c", args->host_bridge, 0);
629 vif->host_if_name = format (0, "%s%c", host_if_name, 0);
630 vif->net_ns = format (0, "%s%c", args->host_namespace, 0);
631 vif->host_mtu_size = args->host_mtu_size;
632 vif->tap_flags = args->tap_flags;
633 clib_memcpy (vif->host_mac_addr, args->host_mac_addr.bytes, 6);
634 vif->host_ip4_prefix_len = args->host_ip4_prefix_len;
635 vif->host_ip6_prefix_len = args->host_ip6_prefix_len;
636 if (args->host_ip4_prefix_len)
637 clib_memcpy (&vif->host_ip4_addr, &args->host_ip4_addr, 4);
638 if (args->host_ip6_prefix_len)
639 clib_memcpy (&vif->host_ip6_addr, &args->host_ip6_addr, 16);
641 if (vif->type != VIRTIO_IF_TYPE_TUN)
644 ethernet_register_interface (vnm, virtio_device_class.index,
645 vif->dev_instance, vif->mac_addr,
647 virtio_eth_flag_change);
650 args->rv = VNET_API_ERROR_INVALID_REGISTRATION;
657 vif->hw_if_index = vnet_register_interface
658 (vnm, virtio_device_class.index,
659 vif->dev_instance /* device instance */ ,
660 tun_device_hw_interface_class.index, vif->dev_instance);
663 tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 1);
664 sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index);
665 vif->sw_if_index = sw->sw_if_index;
666 args->sw_if_index = vif->sw_if_index;
668 hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
669 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_INT_MODE;
670 if (args->tap_flags & TAP_FLAG_GSO)
672 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO |
673 VNET_HW_INTERFACE_CAP_SUPPORTS_TX_TCP_CKSUM |
674 VNET_HW_INTERFACE_CAP_SUPPORTS_TX_UDP_CKSUM;
676 else if (args->tap_flags & TAP_FLAG_CSUM_OFFLOAD)
678 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_TX_TCP_CKSUM |
679 VNET_HW_INTERFACE_CAP_SUPPORTS_TX_UDP_CKSUM;
681 if ((args->tap_flags & TAP_FLAG_GSO)
682 && (args->tap_flags & TAP_FLAG_GRO_COALESCE))
684 virtio_set_packet_coalesce (vif);
686 if (vif->type == VIRTIO_IF_TYPE_TUN)
688 hw->max_supported_packet_bytes = TUN_MAX_PACKET_BYTES;
689 hw->min_packet_bytes = hw->min_supported_packet_bytes =
690 TUN_MIN_PACKET_BYTES;
691 hw->max_packet_bytes =
692 args->host_mtu_size ? args->host_mtu_size : TUN_DEFAULT_PACKET_BYTES;
693 vnet_sw_interface_set_mtu (vnm, hw->sw_if_index, hw->max_packet_bytes);
696 virtio_vring_set_rx_queues (vm, vif);
698 vif->per_interface_next_index = ~0;
699 vif->flags |= VIRTIO_IF_FLAG_ADMIN_UP;
700 vnet_hw_interface_set_flags (vnm, vif->hw_if_index,
701 VNET_HW_INTERFACE_FLAG_LINK_UP);
703 * Host tun/tap driver link carrier state is "up" at creation. The
704 * driver never changes this unless the backend (VPP) changes it using
705 * TUNSETCARRIER ioctl(). See tap_set_carrier().
707 vif->host_carrier_up = 1;
714 ASSERT (args->error == 0);
716 args->rv = VNET_API_ERROR_SYSCALL_ERROR_3;
719 tap_log_err (vif, "%U", format_clib_error, args->error);
723 clib_mem_free (vhost_mem);
724 if (old_netns_fd != -1)
726 /* in case we errored with a switched netns */
727 clib_setns (old_netns_fd);
728 close (old_netns_fd);
735 tap_delete_if (vlib_main_t * vm, u32 sw_if_index)
737 vnet_main_t *vnm = vnet_get_main ();
738 virtio_main_t *mm = &virtio_main;
740 vnet_hw_interface_t *hw;
742 hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index);
743 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
744 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
746 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
748 if ((vif->type != VIRTIO_IF_TYPE_TAP) && (vif->type != VIRTIO_IF_TYPE_TUN))
749 return VNET_API_ERROR_INVALID_INTERFACE;
751 /* bring down the interface */
752 vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0);
753 vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0);
755 if (vif->type == VIRTIO_IF_TYPE_TAP)
756 ethernet_delete_interface (vnm, vif->hw_if_index);
757 else /* VIRTIO_IF_TYPE_TUN */
758 vnet_delete_hw_interface (vnm, vif->hw_if_index);
759 vif->hw_if_index = ~0;
767 tap_csum_offload_enable_disable (vlib_main_t * vm, u32 sw_if_index,
770 vnet_main_t *vnm = vnet_get_main ();
771 virtio_main_t *mm = &virtio_main;
773 vnet_hw_interface_t *hw;
774 clib_error_t *err = 0;
777 hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index);
779 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
780 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
782 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
784 const unsigned int csum_offload_on = TUN_F_CSUM;
785 const unsigned int csum_offload_off = 0;
786 unsigned int offload = enable_disable ? csum_offload_on : csum_offload_off;
787 vec_foreach_index (i, vif->tap_fds)
788 _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload);
789 vif->gso_enabled = 0;
790 vif->packet_coalesce = 0;
791 vif->csum_offload_enabled = enable_disable ? 1 : 0;
793 if ((hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO) != 0)
795 hw->caps &= ~VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO;
800 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM;
804 hw->caps &= ~VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM;
810 clib_warning ("Error %s checksum offload on sw_if_index %d",
811 enable_disable ? "enabling" : "disabling", sw_if_index);
812 return VNET_API_ERROR_SYSCALL_ERROR_3;
818 tap_gso_enable_disable (vlib_main_t * vm, u32 sw_if_index, int enable_disable,
819 int is_packet_coalesce)
821 vnet_main_t *vnm = vnet_get_main ();
822 virtio_main_t *mm = &virtio_main;
824 vnet_hw_interface_t *hw;
825 clib_error_t *err = 0;
828 hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index);
830 if (hw == NULL || virtio_device_class.index != hw->dev_class_index)
831 return VNET_API_ERROR_INVALID_SW_IF_INDEX;
833 vif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
835 const unsigned int gso_on = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6;
836 const unsigned int gso_off = 0;
837 unsigned int offload = enable_disable ? gso_on : gso_off;
838 vec_foreach_index (i, vif->tap_fds)
839 _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload);
840 vif->gso_enabled = enable_disable ? 1 : 0;
841 vif->csum_offload_enabled = 0;
844 if ((hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO) == 0)
846 hw->caps |= VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO |
847 VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM;
849 if (is_packet_coalesce)
851 virtio_set_packet_coalesce (vif);
856 if ((hw->caps & VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO) != 0)
858 hw->caps &= ~(VNET_HW_INTERFACE_CAP_SUPPORTS_TCP_GSO |
859 VNET_HW_INTERFACE_CAP_SUPPORTS_L4_TX_CKSUM);
861 vif->packet_coalesce = 0;
867 clib_warning ("Error %s gso on sw_if_index %d",
868 enable_disable ? "enabling" : "disabling", sw_if_index);
869 return VNET_API_ERROR_SYSCALL_ERROR_3;
875 tap_dump_ifs (tap_interface_details_t ** out_tapids)
877 vnet_main_t *vnm = vnet_get_main ();
878 virtio_main_t *mm = &virtio_main;
880 virtio_vring_t *vring;
881 vnet_hw_interface_t *hi;
882 tap_interface_details_t *r_tapids = NULL;
883 tap_interface_details_t *tapid = NULL;
886 pool_foreach (vif, mm->interfaces) {
887 if ((vif->type != VIRTIO_IF_TYPE_TAP)
888 && (vif->type != VIRTIO_IF_TYPE_TUN))
890 vec_add2(r_tapids, tapid, 1);
891 clib_memset (tapid, 0, sizeof (*tapid));
893 tapid->sw_if_index = vif->sw_if_index;
894 hi = vnet_get_hw_interface (vnm, vif->hw_if_index);
895 clib_memcpy(tapid->dev_name, hi->name,
896 MIN (ARRAY_LEN (tapid->dev_name) - 1, vec_len (hi->name)));
897 vring = vec_elt_at_index (vif->rxq_vrings, RX_QUEUE_ACCESS(0));
898 tapid->rx_ring_sz = vring->size;
899 vring = vec_elt_at_index (vif->txq_vrings, TX_QUEUE_ACCESS(0));
900 tapid->tx_ring_sz = vring->size;
901 tapid->tap_flags = vif->tap_flags;
902 clib_memcpy(&tapid->host_mac_addr, vif->host_mac_addr, 6);
903 if (vif->host_if_name)
905 clib_memcpy(tapid->host_if_name, vif->host_if_name,
906 MIN (ARRAY_LEN (tapid->host_if_name) - 1,
907 vec_len (vif->host_if_name)));
911 clib_memcpy(tapid->host_namespace, vif->net_ns,
912 MIN (ARRAY_LEN (tapid->host_namespace) - 1,
913 vec_len (vif->net_ns)));
915 if (vif->host_bridge)
917 clib_memcpy(tapid->host_bridge, vif->host_bridge,
918 MIN (ARRAY_LEN (tapid->host_bridge) - 1,
919 vec_len (vif->host_bridge)));
921 if (vif->host_ip4_prefix_len)
922 clib_memcpy(tapid->host_ip4_addr.as_u8, &vif->host_ip4_addr, 4);
923 tapid->host_ip4_prefix_len = vif->host_ip4_prefix_len;
924 if (vif->host_ip6_prefix_len)
925 clib_memcpy(tapid->host_ip6_addr.as_u8, &vif->host_ip6_addr, 16);
926 tapid->host_ip6_prefix_len = vif->host_ip6_prefix_len;
927 tapid->host_mtu_size = vif->host_mtu_size;
931 *out_tapids = r_tapids;
937 * Set host tap/tun interface carrier state so it will appear to host
938 * applications that the interface's link state changed.
940 * If the kernel we're building against does not have support for the
941 * TUNSETCARRIER ioctl command, do nothing.
944 tap_set_carrier (u32 hw_if_index, u32 carrier_up)
948 vnet_main_t *vnm = vnet_get_main ();
949 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
950 virtio_main_t *mm = &virtio_main;
954 vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
955 vec_foreach (fd, vif->tap_fds)
957 ret = ioctl (*fd, TUNSETCARRIER, &carrier_up);
960 clib_warning ("ioctl (TUNSETCARRIER) returned %d", ret);
965 vif->host_carrier_up = (carrier_up != 0);
971 static clib_error_t *
972 tap_mtu_config (vlib_main_t * vm, unformat_input_t * input)
974 tap_main_t *tm = &tap_main;
976 while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
978 if (unformat (input, "host-mtu %d", &tm->host_mtu_size))
981 return clib_error_return (0, "unknown input `%U'",
982 format_unformat_error, input);
989 * Set host tap/tun interface speed in Mbps.
992 tap_set_speed (u32 hw_if_index, u32 speed)
994 vnet_main_t *vnm = vnet_get_main ();
995 vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index);
996 virtio_main_t *mm = &virtio_main;
998 int old_netns_fd = -1;
1002 struct ethtool_cmd ecmd;
1005 vif = pool_elt_at_index (mm->interfaces, hi->dev_instance);
1009 old_netns_fd = clib_netns_open (NULL /* self */);
1010 if ((nfd = clib_netns_open (vif->net_ns)) == -1)
1012 clib_warning ("Cannot open netns");
1015 if (clib_setns (nfd) == -1)
1017 clib_warning ("Cannot set ns");
1022 if ((ctl_fd = socket (AF_INET, SOCK_STREAM, 0)) == -1)
1024 clib_warning ("Cannot open control socket");
1028 ecmd.cmd = ETHTOOL_GSET;
1029 clib_memset (&ifr, 0, sizeof (ifr));
1030 clib_memcpy (ifr.ifr_name, vif->host_if_name,
1031 strlen ((const char *) vif->host_if_name));
1032 ifr.ifr_data = (void *) &ecmd;
1033 if ((ret = ioctl (ctl_fd, SIOCETHTOOL, &ifr)) < 0)
1035 clib_warning ("Cannot get device settings");
1039 if (ethtool_cmd_speed (&ecmd) != speed)
1041 ecmd.cmd = ETHTOOL_SSET;
1042 ethtool_cmd_speed_set (&ecmd, speed);
1043 if ((ret = ioctl (ctl_fd, SIOCETHTOOL, &ifr)) < 0)
1045 clib_warning ("Cannot set device settings");
1051 if (old_netns_fd != -1)
1053 if (clib_setns (old_netns_fd) == -1)
1055 clib_warning ("Cannot set old ns");
1057 close (old_netns_fd);
1067 /* tap { host-mtu <size> } configuration. */
1068 VLIB_CONFIG_FUNCTION (tap_mtu_config, "tap");
1070 static clib_error_t *
1071 tap_init (vlib_main_t * vm)
1073 tap_main_t *tm = &tap_main;
1074 clib_error_t *error = 0;
1076 tm->log_default = vlib_log_register_class ("tap", 0);
1077 vlib_log_debug (tm->log_default, "initialized");
1079 tm->host_mtu_size = 0;
1084 VLIB_INIT_FUNCTION (tap_init);
1087 * fd.io coding-style-patch-verification: ON
1090 * eval: (c-set-style "gnu")