/* *------------------------------------------------------------------ * Copyright (c) 2017 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------ */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include tap_main_t tap_main; #define tap_log_err(dev, f, ...) \ vlib_log (VLIB_LOG_LEVEL_ERR, tap_main.log_default, "tap%u: " f, dev->dev_instance, ## __VA_ARGS__) #define tap_log_dbg(dev, f, ...) \ vlib_log (VLIB_LOG_LEVEL_DEBUG, tap_main.log_default, "tap%u: " f, dev->dev_instance, ## __VA_ARGS__) #define _IOCTL(fd,a,...) \ if (ioctl (fd, a, __VA_ARGS__) < 0) \ { \ err = clib_error_return_unix (0, "ioctl(" #a ")"); \ tap_log_err (vif, "%U", format_clib_error, err); \ goto error; \ } VNET_HW_INTERFACE_CLASS (tun_device_hw_interface_class, static) = { .name = "tun-device", .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, .tx_hash_fn_type = VNET_HASH_FN_TYPE_IP, }; #define TUN_MAX_PACKET_BYTES 65355 #define TUN_MIN_PACKET_BYTES 64 #define TUN_DEFAULT_PACKET_BYTES 1500 static u32 virtio_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags) { /* nothing for now */ //TODO On MTU change call vnet_netlink_set_if_mtu return 0; } static clib_error_t * virtio_eth_set_max_frame_size (vnet_main_t *vnm, vnet_hw_interface_t *hi, u32 frame_size) { /* nothing for now */ return 0; } #define TAP_MAX_INSTANCE 1024 static void tap_free (vlib_main_t * vm, virtio_if_t * vif) { virtio_main_t *mm = &virtio_main; tap_main_t *tm = &tap_main; clib_error_t *err = 0; int i; virtio_pre_input_node_disable (vm, vif); vec_foreach_index (i, vif->vhost_fds) if (vif->vhost_fds[i] != -1) close (vif->vhost_fds[i]); vec_foreach_index (i, vif->rxq_vrings) virtio_vring_free_rx (vm, vif, RX_QUEUE (i)); vec_foreach_index (i, vif->txq_vrings) virtio_vring_free_tx (vm, vif, TX_QUEUE (i)); if (vif->tap_fds) { _IOCTL (vif->tap_fds[0], TUNSETPERSIST, (void *) (uintptr_t) 0); tap_log_dbg (vif, "TUNSETPERSIST: unset"); } error: vec_foreach_index (i, vif->tap_fds) close (vif->tap_fds[i]); vec_free (vif->tap_fds); vec_free (vif->vhost_fds); vec_free (vif->rxq_vrings); vec_free (vif->txq_vrings); vec_free (vif->host_if_name); vec_free (vif->net_ns); vec_free (vif->host_bridge); clib_error_free (vif->error); tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 0); clib_memset (vif, 0, sizeof (*vif)); pool_put (mm->interfaces, vif); } void tap_create_if (vlib_main_t * vm, tap_create_if_args_t * args) { vlib_thread_main_t *thm = vlib_get_thread_main (); vlib_physmem_main_t *vpm = &vm->physmem_main; vnet_main_t *vnm = vnet_get_main (); virtio_main_t *vim = &virtio_main; tap_main_t *tm = &tap_main; vnet_sw_interface_t *sw; vnet_hw_interface_t *hw; vnet_hw_if_caps_change_t cc; int i, num_vhost_queues; int old_netns_fd = -1; struct ifreq ifr = {.ifr_flags = IFF_NO_PI | IFF_VNET_HDR }; struct ifreq get_ifr = {.ifr_flags = 0 }; size_t hdrsz; vhost_memory_t *vhost_mem = 0; virtio_if_t *vif = 0; clib_error_t *err = 0; unsigned int tap_features; int tfd = -1, qfd = -1, vfd = -1, nfd = -1; char *host_if_name = 0; unsigned int offload = 0; int sndbuf = 0; if (args->id != ~0) { if (clib_bitmap_get (tm->tap_ids, args->id)) { args->rv = VNET_API_ERROR_INVALID_INTERFACE; args->error = clib_error_return (0, "interface already exists"); return; } } else { args->id = clib_bitmap_first_clear (tm->tap_ids); } if (args->id > TAP_MAX_INSTANCE) { args->rv = VNET_API_ERROR_UNSPECIFIED; args->error = clib_error_return (0, "cannot find free interface id"); return; } pool_get_zero (vim->interfaces, vif); if (args->tap_flags & TAP_FLAG_TUN) { vif->type = VIRTIO_IF_TYPE_TUN; ifr.ifr_flags |= IFF_TUN; /* * From kernel 4.20, xdp support has been added in tun_sendmsg. * If sndbuf == INT_MAX, vhost batches the packet and processes * them using xdp data path for tun driver. It assumes packets * are ethernet frames (It needs to be fixed). * To avoid xdp data path in tun driver, sndbuf value should * be < INT_MAX. */ sndbuf = INT_MAX - 1; } else { vif->type = VIRTIO_IF_TYPE_TAP; ifr.ifr_flags |= IFF_TAP; sndbuf = INT_MAX; } vif->dev_instance = vif - vim->interfaces; vif->id = args->id; vif->num_txqs = clib_max (args->num_tx_queues, thm->n_vlib_mains); vif->num_rxqs = clib_max (args->num_rx_queues, 1); if (args->tap_flags & TAP_FLAG_ATTACH) { if (args->host_if_name == NULL) { args->rv = VNET_API_ERROR_NO_MATCHING_INTERFACE; err = clib_error_return (0, "host_if_name is not provided"); goto error; } } /* if namespace is specified, all further netlink messages should be executed * after we change our net namespace */ if (args->host_namespace) { old_netns_fd = clib_netns_open (NULL /* self */); if ((nfd = clib_netns_open (args->host_namespace)) == -1) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return_unix (0, "clib_netns_open '%s'", args->host_namespace); goto error; } if (clib_setns (nfd) == -1) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; args->error = clib_error_return_unix (0, "setns '%s'", args->host_namespace); goto error; } } if (args->host_if_name != NULL) { host_if_name = (char *) args->host_if_name; clib_memcpy (ifr.ifr_name, host_if_name, clib_min (IFNAMSIZ, vec_len (host_if_name))); } if ((tfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return_unix (0, "open '/dev/net/tun'"); goto error; } vec_add1 (vif->tap_fds, tfd); tap_log_dbg (vif, "open tap fd %d", tfd); _IOCTL (tfd, TUNGETFEATURES, &tap_features); tap_log_dbg (vif, "TUNGETFEATURES: features 0x%lx", tap_features); if ((tap_features & IFF_VNET_HDR) == 0) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return (0, "vhost-net backend not available"); goto error; } if ((tap_features & IFF_MULTI_QUEUE) == 0) { if (vif->num_rxqs > 1) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return (0, "multiqueue not supported"); goto error; } vif->num_rxqs = vif->num_txqs = 1; } else ifr.ifr_flags |= IFF_MULTI_QUEUE; hdrsz = sizeof (vnet_virtio_net_hdr_v1_t); if (args->tap_flags & TAP_FLAG_GSO) { offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6; vif->gso_enabled = 1; } else if (args->tap_flags & TAP_FLAG_CSUM_OFFLOAD) { offload = TUN_F_CSUM; vif->csum_offload_enabled = 1; } _IOCTL (tfd, TUNSETIFF, (void *) &ifr); tap_log_dbg (vif, "TUNSETIFF fd %d name %s flags 0x%x", tfd, ifr.ifr_ifrn.ifrn_name, ifr.ifr_flags); vif->ifindex = if_nametoindex (ifr.ifr_ifrn.ifrn_name); tap_log_dbg (vif, "ifindex %d", vif->ifindex); if (!args->host_if_name) host_if_name = ifr.ifr_ifrn.ifrn_name; else host_if_name = (char *) args->host_if_name; /* * unset the persistence when attaching to existing * interface */ if (args->tap_flags & TAP_FLAG_ATTACH) { _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 0); tap_log_dbg (vif, "TUNSETPERSIST: unset"); } /* set the persistence */ if (args->tap_flags & TAP_FLAG_PERSIST) { _IOCTL (tfd, TUNSETPERSIST, (void *) (uintptr_t) 1); tap_log_dbg (vif, "TUNSETPERSIST: set"); /* verify persistence is set, read the flags */ _IOCTL (tfd, TUNGETIFF, (void *) &get_ifr); tap_log_dbg (vif, "TUNGETIFF: flags 0x%lx", get_ifr.ifr_flags); if ((get_ifr.ifr_flags & IFF_PERSIST) == 0) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return (0, "persistence not supported"); goto error; } } /* create additional queues on the linux side. * we create as many linux queue pairs as we have rx queues */ for (i = 1; i < vif->num_rxqs; i++) { if ((qfd = open ("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return_unix (0, "open '/dev/net/tun'"); goto error; } vec_add1 (vif->tap_fds, qfd); _IOCTL (qfd, TUNSETIFF, (void *) &ifr); tap_log_dbg (vif, "TUNSETIFF fd %d name %s flags 0x%x", qfd, ifr.ifr_ifrn.ifrn_name, ifr.ifr_flags); } for (i = 0; i < vif->num_rxqs; i++) { tap_log_dbg (vif, "TUNSETVNETHDRSZ: fd %d vnet_hdr_sz %u", vif->tap_fds[i], hdrsz); _IOCTL (vif->tap_fds[i], TUNSETVNETHDRSZ, &hdrsz); tap_log_dbg (vif, "TUNSETSNDBUF: fd %d sndbuf %d", vif->tap_fds[i], sndbuf); _IOCTL (vif->tap_fds[i], TUNSETSNDBUF, &sndbuf); tap_log_dbg (vif, "TUNSETOFFLOAD: fd %d offload 0x%lx", vif->tap_fds[i], offload); _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload); if (fcntl (vif->tap_fds[i], F_SETFL, O_NONBLOCK) < 0) { err = clib_error_return_unix (0, "fcntl(tfd, F_SETFL, O_NONBLOCK)"); tap_log_err (vif, "set nonblocking: %U", format_clib_error, err); goto error; } } /* open as many vhost-net fds as required and set ownership */ num_vhost_queues = clib_max (vif->num_rxqs, vif->num_txqs); for (i = 0; i < num_vhost_queues; i++) { if ((vfd = open ("/dev/vhost-net", O_RDWR | O_NONBLOCK)) < 0) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_1; args->error = clib_error_return_unix (0, "open '/dev/vhost-net'"); goto error; } vec_add1 (vif->vhost_fds, vfd); virtio_log_debug (vif, "open vhost-net fd %d qpair %u", vfd, i); _IOCTL (vfd, VHOST_SET_OWNER, 0); virtio_log_debug (vif, "VHOST_SET_OWNER: fd %u", vfd); } _IOCTL (vif->vhost_fds[0], VHOST_GET_FEATURES, &vif->remote_features); virtio_log_debug (vif, "VHOST_GET_FEATURES: features 0x%lx", vif->remote_features); if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF)) == 0) { args->rv = VNET_API_ERROR_UNSUPPORTED; args->error = clib_error_return (0, "vhost-net backend doesn't support " "VIRTIO_NET_F_MRG_RXBUF feature"); goto error; } if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC)) == 0) { args->rv = VNET_API_ERROR_UNSUPPORTED; args->error = clib_error_return (0, "vhost-net backend doesn't support " "VIRTIO_RING_F_INDIRECT_DESC feature"); goto error; } if ((vif->remote_features & VIRTIO_FEATURE (VIRTIO_F_VERSION_1)) == 0) { args->rv = VNET_API_ERROR_UNSUPPORTED; args->error = clib_error_return (0, "vhost-net backend doesn't support " "VIRTIO_F_VERSION_1 features"); goto error; } vif->features |= VIRTIO_FEATURE (VIRTIO_NET_F_MRG_RXBUF); vif->features |= VIRTIO_FEATURE (VIRTIO_F_VERSION_1); vif->features |= VIRTIO_FEATURE (VIRTIO_RING_F_INDIRECT_DESC); virtio_set_net_hdr_size (vif); if (vif->type == VIRTIO_IF_TYPE_TAP) { if (ethernet_mac_address_is_zero (args->host_mac_addr.bytes)) ethernet_mac_address_generate (args->host_mac_addr.bytes); args->error = vnet_netlink_set_link_addr (vif->ifindex, args->host_mac_addr.bytes); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } if (args->host_bridge) { args->error = vnet_netlink_set_link_master (vif->ifindex, (char *) args->host_bridge); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } } } if (args->host_ip4_prefix_len) { args->error = vnet_netlink_add_ip4_addr (vif->ifindex, &args->host_ip4_addr, args->host_ip4_prefix_len); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } } if (args->host_ip6_prefix_len) { args->error = vnet_netlink_add_ip6_addr (vif->ifindex, &args->host_ip6_addr, args->host_ip6_prefix_len); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } } args->error = vnet_netlink_set_link_state (vif->ifindex, 1 /* UP */ ); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } if (args->host_ip4_gw_set) { args->error = vnet_netlink_add_ip4_route (0, 0, &args->host_ip4_gw); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } } if (args->host_ip6_gw_set) { args->error = vnet_netlink_add_ip6_route (0, 0, &args->host_ip6_gw); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } } if (args->host_mtu_set) { args->error = vnet_netlink_set_link_mtu (vif->ifindex, args->host_mtu_size); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } } else if (tm->host_mtu_size != 0) { args->error = vnet_netlink_set_link_mtu (vif->ifindex, tm->host_mtu_size); if (args->error) { args->rv = VNET_API_ERROR_NETLINK_ERROR; goto error; } args->host_mtu_set = 1; args->host_mtu_size = tm->host_mtu_size; } /* switch back to old net namespace */ if (args->host_namespace) { if (clib_setns (old_netns_fd) == -1) { args->rv = VNET_API_ERROR_SYSCALL_ERROR_2; args->error = clib_error_return_unix (0, "setns '%s'", args->host_namespace); goto error; } } for (i = 0; i < num_vhost_queues; i++) { if (i < vif->num_rxqs && (args->error = virtio_vring_init (vm, vif, RX_QUEUE (i), args->rx_ring_sz))) { args->rv = VNET_API_ERROR_INIT_FAILED; goto error; } if (i < vif->num_txqs && (args->error = virtio_vring_init (vm, vif, TX_QUEUE (i), args->tx_ring_sz))) { args->rv = VNET_API_ERROR_INIT_FAILED; goto error; } } /* setup features and memtable */ i = sizeof (vhost_memory_t) + sizeof (vhost_memory_region_t); vhost_mem = clib_mem_alloc (i); clib_memset (vhost_mem, 0, i); vhost_mem->nregions = 1; vhost_mem->regions[0].memory_size = vpm->max_size; vhost_mem->regions[0].guest_phys_addr = vpm->base_addr; vhost_mem->regions[0].userspace_addr = vhost_mem->regions[0].guest_phys_addr; for (i = 0; i < vhost_mem->nregions; i++) virtio_log_debug (vif, "memtable region %u memory_size 0x%lx " "guest_phys_addr 0x%lx userspace_addr 0x%lx", i, vhost_mem->regions[0].memory_size, vhost_mem->regions[0].guest_phys_addr, vhost_mem->regions[0].userspace_addr); for (i = 0; i < num_vhost_queues; i++) { int fd = vif->vhost_fds[i]; _IOCTL (fd, VHOST_SET_FEATURES, &vif->features); virtio_log_debug (vif, "VHOST_SET_FEATURES: fd %u features 0x%lx", fd, vif->features); _IOCTL (fd, VHOST_SET_MEM_TABLE, vhost_mem); virtio_log_debug (vif, "VHOST_SET_MEM_TABLE: fd %u", fd); } /* finish initializing queue pair */ for (i = 0; i < num_vhost_queues * 2; i++) { vhost_vring_addr_t addr = { 0 }; vhost_vring_state_t state = { 0 }; vhost_vring_file_t file = { 0 }; vnet_virtio_vring_t *vring; u16 qp = i >> 1; int fd = vif->vhost_fds[qp]; if (i & 1) { if (qp >= vif->num_txqs) continue; vring = vec_elt_at_index (vif->txq_vrings, qp); } else { if (qp >= vif->num_rxqs) continue; vring = vec_elt_at_index (vif->rxq_vrings, qp); } addr.index = state.index = file.index = vring->queue_id & 1; state.num = vring->queue_size; virtio_log_debug (vif, "VHOST_SET_VRING_NUM fd %d index %u num %u", fd, state.index, state.num); _IOCTL (fd, VHOST_SET_VRING_NUM, &state); addr.flags = 0; addr.desc_user_addr = pointer_to_uword (vring->desc); addr.avail_user_addr = pointer_to_uword (vring->avail); addr.used_user_addr = pointer_to_uword (vring->used); virtio_log_debug (vif, "VHOST_SET_VRING_ADDR fd %d index %u flags 0x%x " "desc_user_addr 0x%lx avail_user_addr 0x%lx " "used_user_addr 0x%lx", fd, addr.index, addr.flags, addr.desc_user_addr, addr.avail_user_addr, addr.used_user_addr); _IOCTL (fd, VHOST_SET_VRING_ADDR, &addr); file.fd = vring->call_fd; virtio_log_debug (vif, "VHOST_SET_VRING_CALL fd %d index %u call_fd %d", fd, file.index, file.fd); _IOCTL (fd, VHOST_SET_VRING_CALL, &file); file.fd = vring->kick_fd; virtio_log_debug (vif, "VHOST_SET_VRING_KICK fd %d index %u kick_fd %d", fd, file.index, file.fd); _IOCTL (fd, VHOST_SET_VRING_KICK, &file); file.fd = vif->tap_fds[qp % vif->num_rxqs]; virtio_log_debug (vif, "VHOST_NET_SET_BACKEND fd %d index %u tap_fd %d", fd, file.index, file.fd); _IOCTL (fd, VHOST_NET_SET_BACKEND, &file); } if (vif->type == VIRTIO_IF_TYPE_TAP) { if (!args->mac_addr_set) ethernet_mac_address_generate (args->mac_addr.bytes); clib_memcpy (vif->mac_addr, args->mac_addr.bytes, 6); if (args->host_bridge) vif->host_bridge = format (0, "%s%c", args->host_bridge, 0); } vif->host_if_name = format (0, "%s%c", host_if_name, 0); if (args->host_namespace) vif->net_ns = format (0, "%s%c", args->host_namespace, 0); vif->host_mtu_size = args->host_mtu_size; vif->tap_flags = args->tap_flags; clib_memcpy (vif->host_mac_addr, args->host_mac_addr.bytes, 6); vif->host_ip4_prefix_len = args->host_ip4_prefix_len; vif->host_ip6_prefix_len = args->host_ip6_prefix_len; if (args->host_ip4_prefix_len) clib_memcpy (&vif->host_ip4_addr, &args->host_ip4_addr, 4); if (args->host_ip6_prefix_len) clib_memcpy (&vif->host_ip6_addr, &args->host_ip6_addr, 16); if (vif->type != VIRTIO_IF_TYPE_TUN) { vnet_eth_interface_registration_t eir = {}; eir.dev_class_index = virtio_device_class.index; eir.dev_instance = vif->dev_instance; eir.address = vif->mac_addr; eir.cb.flag_change = virtio_eth_flag_change; eir.cb.set_max_frame_size = virtio_eth_set_max_frame_size; vif->hw_if_index = vnet_eth_register_interface (vnm, &eir); } else { vif->hw_if_index = vnet_register_interface (vnm, virtio_device_class.index, vif->dev_instance /* device instance */ , tun_device_hw_interface_class.index, vif->dev_instance); } tm->tap_ids = clib_bitmap_set (tm->tap_ids, vif->id, 1); sw = vnet_get_hw_sw_interface (vnm, vif->hw_if_index); vif->sw_if_index = sw->sw_if_index; args->sw_if_index = vif->sw_if_index; args->rv = 0; hw = vnet_get_hw_interface (vnm, vif->hw_if_index); cc.mask = VNET_HW_IF_CAP_INT_MODE | VNET_HW_IF_CAP_TCP_GSO | VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM; cc.val = VNET_HW_IF_CAP_INT_MODE; if (args->tap_flags & TAP_FLAG_GSO) cc.val |= VNET_HW_IF_CAP_TCP_GSO | VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM; else if (args->tap_flags & TAP_FLAG_CSUM_OFFLOAD) cc.val |= VNET_HW_IF_CAP_TX_TCP_CKSUM | VNET_HW_IF_CAP_TX_UDP_CKSUM; if ((args->tap_flags & TAP_FLAG_GSO) && (args->tap_flags & TAP_FLAG_GRO_COALESCE)) { virtio_set_packet_coalesce (vif); } if (vif->type == VIRTIO_IF_TYPE_TUN) { hw->min_frame_size = TUN_MIN_PACKET_BYTES; vnet_hw_interface_set_mtu ( vnm, hw->hw_if_index, args->host_mtu_size ? args->host_mtu_size : TUN_DEFAULT_PACKET_BYTES); } vnet_hw_if_change_caps (vnm, vif->hw_if_index, &cc); virtio_pre_input_node_enable (vm, vif); virtio_vring_set_rx_queues (vm, vif); virtio_vring_set_tx_queues (vm, vif); vif->per_interface_next_index = ~0; vnet_hw_interface_set_flags (vnm, vif->hw_if_index, VNET_HW_INTERFACE_FLAG_LINK_UP); /* * Host tun/tap driver link carrier state is "up" at creation. The * driver never changes this unless the backend (VPP) changes it using * TUNSETCARRIER ioctl(). See tap_set_carrier(). */ vif->host_carrier_up = 1; goto done; error: if (err) { ASSERT (args->error == 0); args->error = err; args->rv = VNET_API_ERROR_SYSCALL_ERROR_3; } tap_log_err (vif, "%U", format_clib_error, args->error); tap_free (vm, vif); done: if (vhost_mem) clib_mem_free (vhost_mem); if (old_netns_fd != -1) { /* in case we errored with a switched netns */ clib_setns (old_netns_fd); close (old_netns_fd); } if (nfd != -1) close (nfd); } int tap_delete_if (vlib_main_t * vm, u32 sw_if_index) { vnet_main_t *vnm = vnet_get_main (); virtio_main_t *mm = &virtio_main; virtio_if_t *vif; vnet_hw_interface_t *hw; hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index); if (hw == NULL || virtio_device_class.index != hw->dev_class_index) return VNET_API_ERROR_INVALID_SW_IF_INDEX; vif = pool_elt_at_index (mm->interfaces, hw->dev_instance); if ((vif->type != VIRTIO_IF_TYPE_TAP) && (vif->type != VIRTIO_IF_TYPE_TUN)) return VNET_API_ERROR_INVALID_INTERFACE; /* bring down the interface */ vnet_hw_interface_set_flags (vnm, vif->hw_if_index, 0); vnet_sw_interface_set_flags (vnm, vif->sw_if_index, 0); if (vif->type == VIRTIO_IF_TYPE_TAP) ethernet_delete_interface (vnm, vif->hw_if_index); else /* VIRTIO_IF_TYPE_TUN */ vnet_delete_hw_interface (vnm, vif->hw_if_index); vif->hw_if_index = ~0; tap_free (vm, vif); return 0; } int tap_csum_offload_enable_disable (vlib_main_t * vm, u32 sw_if_index, int enable_disable) { vnet_main_t *vnm = vnet_get_main (); virtio_main_t *mm = &virtio_main; virtio_if_t *vif; vnet_hw_interface_t *hw; vnet_hw_if_caps_change_t cc; clib_error_t *err = 0; int i = 0; hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index); if (hw == NULL || virtio_device_class.index != hw->dev_class_index) return VNET_API_ERROR_INVALID_SW_IF_INDEX; vif = pool_elt_at_index (mm->interfaces, hw->dev_instance); const unsigned int csum_offload_on = TUN_F_CSUM; const unsigned int csum_offload_off = 0; unsigned int offload = enable_disable ? csum_offload_on : csum_offload_off; vec_foreach_index (i, vif->tap_fds) _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload); vif->gso_enabled = 0; vif->packet_coalesce = 0; cc.mask = VNET_HW_IF_CAP_TCP_GSO | VNET_HW_IF_CAP_L4_TX_CKSUM; if (enable_disable) { cc.val = VNET_HW_IF_CAP_L4_TX_CKSUM; vif->csum_offload_enabled = 1; } else { cc.val = 0; vif->csum_offload_enabled = 0; } vnet_hw_if_change_caps (vnm, vif->hw_if_index, &cc); error: if (err) { clib_warning ("Error %s checksum offload on sw_if_index %d", enable_disable ? "enabling" : "disabling", sw_if_index); return VNET_API_ERROR_SYSCALL_ERROR_3; } return 0; } int tap_gso_enable_disable (vlib_main_t * vm, u32 sw_if_index, int enable_disable, int is_packet_coalesce) { vnet_main_t *vnm = vnet_get_main (); virtio_main_t *mm = &virtio_main; virtio_if_t *vif; vnet_hw_interface_t *hw; vnet_hw_if_caps_change_t cc; clib_error_t *err = 0; int i = 0; hw = vnet_get_sup_hw_interface_api_visible_or_null (vnm, sw_if_index); if (hw == NULL || virtio_device_class.index != hw->dev_class_index) return VNET_API_ERROR_INVALID_SW_IF_INDEX; vif = pool_elt_at_index (mm->interfaces, hw->dev_instance); const unsigned int gso_on = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6; const unsigned int gso_off = 0; unsigned int offload = enable_disable ? gso_on : gso_off; vec_foreach_index (i, vif->tap_fds) _IOCTL (vif->tap_fds[i], TUNSETOFFLOAD, offload); cc.mask = VNET_HW_IF_CAP_TCP_GSO | VNET_HW_IF_CAP_L4_TX_CKSUM; if (enable_disable) { cc.val = cc.mask; vif->gso_enabled = 1; vif->csum_offload_enabled = 1; if (is_packet_coalesce) virtio_set_packet_coalesce (vif); } else { cc.val = 0; vif->gso_enabled = 0; vif->csum_offload_enabled = 0; vif->packet_coalesce = 0; } vnet_hw_if_change_caps (vnm, vif->hw_if_index, &cc); error: if (err) { clib_warning ("Error %s gso on sw_if_index %d", enable_disable ? "enabling" : "disabling", sw_if_index); return VNET_API_ERROR_SYSCALL_ERROR_3; } return 0; } int tap_dump_ifs (tap_interface_details_t ** out_tapids) { vnet_main_t *vnm = vnet_get_main (); virtio_main_t *mm = &virtio_main; virtio_if_t *vif; vnet_virtio_vring_t *vring; vnet_hw_interface_t *hi; tap_interface_details_t *r_tapids = NULL; tap_interface_details_t *tapid = NULL; pool_foreach (vif, mm->interfaces) { if ((vif->type != VIRTIO_IF_TYPE_TAP) && (vif->type != VIRTIO_IF_TYPE_TUN)) continue; vec_add2(r_tapids, tapid, 1); clib_memset (tapid, 0, sizeof (*tapid)); tapid->id = vif->id; tapid->sw_if_index = vif->sw_if_index; hi = vnet_get_hw_interface (vnm, vif->hw_if_index); clib_memcpy(tapid->dev_name, hi->name, MIN (ARRAY_LEN (tapid->dev_name) - 1, vec_len (hi->name))); vring = vec_elt_at_index (vif->rxq_vrings, RX_QUEUE_ACCESS(0)); tapid->rx_ring_sz = vring->queue_size; vring = vec_elt_at_index (vif->txq_vrings, TX_QUEUE_ACCESS(0)); tapid->tx_ring_sz = vring->queue_size; tapid->tap_flags = vif->tap_flags; clib_memcpy(&tapid->host_mac_addr, vif->host_mac_addr, 6); if (vif->host_if_name) { clib_memcpy(tapid->host_if_name, vif->host_if_name, MIN (ARRAY_LEN (tapid->host_if_name) - 1, vec_len (vif->host_if_name))); } if (vif->net_ns) { clib_memcpy(tapid->host_namespace, vif->net_ns, MIN (ARRAY_LEN (tapid->host_namespace) - 1, vec_len (vif->net_ns))); } if (vif->host_bridge) { clib_memcpy(tapid->host_bridge, vif->host_bridge, MIN (ARRAY_LEN (tapid->host_bridge) - 1, vec_len (vif->host_bridge))); } if (vif->host_ip4_prefix_len) clib_memcpy(tapid->host_ip4_addr.as_u8, &vif->host_ip4_addr, 4); tapid->host_ip4_prefix_len = vif->host_ip4_prefix_len; if (vif->host_ip6_prefix_len) clib_memcpy(tapid->host_ip6_addr.as_u8, &vif->host_ip6_addr, 16); tapid->host_ip6_prefix_len = vif->host_ip6_prefix_len; tapid->host_mtu_size = vif->host_mtu_size; } *out_tapids = r_tapids; return 0; } /* * Set host tap/tun interface carrier state so it will appear to host * applications that the interface's link state changed. * * If the kernel we're building against does not have support for the * TUNSETCARRIER ioctl command, do nothing. */ int tap_set_carrier (u32 hw_if_index, u32 carrier_up) { int ret = 0; #ifdef TUNSETCARRIER vnet_main_t *vnm = vnet_get_main (); vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index); virtio_main_t *mm = &virtio_main; virtio_if_t *vif; int *fd; vif = pool_elt_at_index (mm->interfaces, hi->dev_instance); vec_foreach (fd, vif->tap_fds) { ret = ioctl (*fd, TUNSETCARRIER, &carrier_up); if (ret < 0) { clib_warning ("ioctl (TUNSETCARRIER) returned %d", ret); break; } } if (!ret) vif->host_carrier_up = (carrier_up != 0); #endif return ret; } static clib_error_t * tap_mtu_config (vlib_main_t * vm, unformat_input_t * input) { tap_main_t *tm = &tap_main; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "host-mtu %d", &tm->host_mtu_size)) ; else return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); } return 0; } /* * Set host tap/tun interface speed in Mbps. */ int tap_set_speed (u32 hw_if_index, u32 speed) { vnet_main_t *vnm = vnet_get_main (); vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index); virtio_main_t *mm = &virtio_main; virtio_if_t *vif; int old_netns_fd = -1; int nfd = -1; int ctl_fd = -1; struct ifreq ifr; struct ethtool_cmd ecmd; int ret = -1; vif = pool_elt_at_index (mm->interfaces, hi->dev_instance); if (vif->net_ns) { old_netns_fd = clib_netns_open (NULL /* self */); if ((nfd = clib_netns_open (vif->net_ns)) == -1) { clib_warning ("Cannot open netns"); goto done; } if (clib_setns (nfd) == -1) { clib_warning ("Cannot set ns"); goto done; } } if ((ctl_fd = socket (AF_INET, SOCK_STREAM, 0)) == -1) { clib_warning ("Cannot open control socket"); goto done; } ecmd.cmd = ETHTOOL_GSET; clib_memset (&ifr, 0, sizeof (ifr)); clib_memcpy (ifr.ifr_name, vif->host_if_name, strlen ((const char *) vif->host_if_name)); ifr.ifr_data = (void *) &ecmd; if ((ret = ioctl (ctl_fd, SIOCETHTOOL, &ifr)) < 0) { clib_warning ("Cannot get device settings"); goto done; } if (ethtool_cmd_speed (&ecmd) != speed) { ecmd.cmd = ETHTOOL_SSET; ethtool_cmd_speed_set (&ecmd, speed); if ((ret = ioctl (ctl_fd, SIOCETHTOOL, &ifr)) < 0) { clib_warning ("Cannot set device settings"); goto done; } } done: if (old_netns_fd != -1) { if (clib_setns (old_netns_fd) == -1) { clib_warning ("Cannot set old ns"); } close (old_netns_fd); } if (nfd != -1) close (nfd); if (ctl_fd != -1) close (ctl_fd); return ret; } /* tap { host-mtu } configuration. */ VLIB_CONFIG_FUNCTION (tap_mtu_config, "tap"); static clib_error_t * tap_init (vlib_main_t * vm) { tap_main_t *tm = &tap_main; clib_error_t *error = 0; tm->log_default = vlib_log_register_class ("tap", 0); vlib_log_debug (tm->log_default, "initialized"); tm->host_mtu_size = 0; return error; } VLIB_INIT_FUNCTION (tap_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */