/* * Virtio Network Device * * Copyright IBM, Corp. 2007 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #include "qemu/osdep.h" #include "qemu/iov.h" #include "hw/virtio/virtio.h" #include "net/net.h" #include "net/checksum.h" #include "net/tap.h" #include "qemu/error-report.h" #include "qemu/timer.h" #include "hw/virtio/virtio-net.h" #include "net/vhost_net.h" #include "hw/virtio/virtio-bus.h" #include "qapi/qmp/qjson.h" #include "qapi-event.h" #include "hw/virtio/virtio-access.h" #include "migration/misc.h" #define VIRTIO_NET_VM_VERSION 11 #define MAC_TABLE_ENTRIES 64 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ /* previously fixed value */ #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256 /* for now, only allow larger queues; with virtio-1, guest can downsize */ #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE /* * Calculate the number of bytes up to and including the given 'field' of * 'container'. */ #define endof(container, field) \ (offsetof(container, field) + sizeof(((container *)0)->field)) typedef struct VirtIOFeature { uint32_t flags; size_t end; } VirtIOFeature; static VirtIOFeature feature_sizes[] = { {.flags = 1 << VIRTIO_NET_F_MAC, .end = endof(struct virtio_net_config, mac)}, {.flags = 1 << VIRTIO_NET_F_STATUS, .end = endof(struct virtio_net_config, status)}, {.flags = 1 << VIRTIO_NET_F_MQ, .end = endof(struct virtio_net_config, max_virtqueue_pairs)}, {.flags = 1 << VIRTIO_NET_F_MTU, .end = endof(struct virtio_net_config, mtu)}, {} }; static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc) { VirtIONet *n = qemu_get_nic_opaque(nc); return &n->vqs[nc->queue_index]; } static int vq2q(int queue_index) { return queue_index / 2; } /* TODO * - we could suppress RX interrupt if we were so inclined. */ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) { VirtIONet *n = VIRTIO_NET(vdev); struct virtio_net_config netcfg; virtio_stw_p(vdev, &netcfg.status, n->status); virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues); virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu); memcpy(netcfg.mac, n->mac, ETH_ALEN); memcpy(config, &netcfg, n->config_size); } static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) { VirtIONet *n = VIRTIO_NET(vdev); struct virtio_net_config netcfg = {}; memcpy(&netcfg, config, n->config_size); if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) && memcmp(netcfg.mac, n->mac, ETH_ALEN)) { memcpy(n->mac, netcfg.mac, ETH_ALEN); qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); } } static bool virtio_net_started(VirtIONet *n, uint8_t status) { VirtIODevice *vdev = VIRTIO_DEVICE(n); return (status & VIRTIO_CONFIG_S_DRIVER_OK) && (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running; } static void virtio_net_announce_timer(void *opaque) { VirtIONet *n = opaque; VirtIODevice *vdev = VIRTIO_DEVICE(n); n->announce_counter--; n->status |= VIRTIO_NET_S_ANNOUNCE; virtio_notify_config(vdev); } static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) { VirtIODevice *vdev = VIRTIO_DEVICE(n); NetClientState *nc = qemu_get_queue(n->nic); int queues = n->multiqueue ? n->max_queues : 1; if (!get_vhost_net(nc->peer)) { return; } if ((virtio_net_started(n, status) && !nc->peer->link_down) == !!n->vhost_started) { return; } if (!n->vhost_started) { int r, i; if (n->needs_vnet_hdr_swap) { error_report("backend does not support %s vnet headers; " "falling back on userspace virtio", virtio_is_big_endian(vdev) ? "BE" : "LE"); return; } /* Any packets outstanding? Purge them to avoid touching rings * when vhost is running. */ for (i = 0; i < queues; i++) { NetClientState *qnc = qemu_get_subqueue(n->nic, i); /* Purge both directions: TX and RX. */ qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); } if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) { r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu); if (r < 0) { error_report("%uBytes MTU not supported by the backend", n->net_conf.mtu); return; } } n->vhost_started = 1; r = vhost_net_start(vdev, n->nic->ncs, queues); if (r < 0) { error_report("unable to start vhost net: %d: " "falling back on userspace virtio", -r); n->vhost_started = 0; } } else { vhost_net_stop(vdev, n->nic->ncs, queues); n->vhost_started = 0; } } static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev, NetClientState *peer, bool enable) { if (virtio_is_big_endian(vdev)) { return qemu_set_vnet_be(peer, enable); } else { return qemu_set_vnet_le(peer, enable); } } static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs, int queues, bool enable) { int i; for (i = 0; i < queues; i++) { if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 && enable) { while (--i >= 0) { virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false); } return true; } } return false; } static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status) { VirtIODevice *vdev = VIRTIO_DEVICE(n); int queues = n->multiqueue ? n->max_queues : 1; if (virtio_net_started(n, status)) { /* Before using the device, we tell the network backend about the * endianness to use when parsing vnet headers. If the backend * can't do it, we fallback onto fixing the headers in the core * virtio-net code. */ n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, true); } else if (virtio_net_started(n, vdev->status)) { /* After using the device, we need to reset the network backend to * the default (guest native endianness), otherwise the guest may * lose network connectivity if it is rebooted into a different * endianness. */ virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false); } } static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq) { unsigned int dropped = virtqueue_drop_all(vq); if (dropped) { virtio_notify(vdev, vq); } } static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) { VirtIONet *n = VIRTIO_NET(vdev); VirtIONetQueue *q; int i; uint8_t queue_status; virtio_net_vnet_endian_status(n, status); virtio_net_vhost_status(n, status); for (i = 0; i < n->max_queues; i++) { NetClientState *ncs = qemu_get_subqueue(n->nic, i); bool queue_started; q = &n->vqs[i]; if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { queue_status = 0; } else { queue_status = status; } queue_started = virtio_net_started(n, queue_status) && !n->vhost_started; if (queue_started) { qemu_flush_queued_packets(ncs); } if (!q->tx_waiting) { continue; } if (queue_started) { if (q->tx_timer) { timer_mod(q->tx_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); } else { qemu_bh_schedule(q->tx_bh); } } else { if (q->tx_timer) { timer_del(q->tx_timer); } else { qemu_bh_cancel(q->tx_bh); } if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 && (queue_status & VIRTIO_CONFIG_S_DRIVER_OK)) { /* if tx is waiting we are likely have some packets in tx queue * and disabled notification */ q->tx_waiting = 0; virtio_queue_set_notification(q->tx_vq, 1); virtio_net_drop_tx_queue_data(vdev, q->tx_vq); } } } } static void virtio_net_set_link_status(NetClientState *nc) { VirtIONet *n = qemu_get_nic_opaque(nc); VirtIODevice *vdev = VIRTIO_DEVICE(n); uint16_t old_status = n->status; if (nc->link_down) n->status &= ~VIRTIO_NET_S_LINK_UP; else n->status |= VIRTIO_NET_S_LINK_UP; if (n->status != old_status) virtio_notify_config(vdev); virtio_net_set_status(vdev, vdev->status); } static void rxfilter_notify(NetClientState *nc) { VirtIONet *n = qemu_get_nic_opaque(nc); if (nc->rxfilter_notify_enabled) { gchar *path = object_get_canonical_path(OBJECT(n->qdev)); qapi_event_send_nic_rx_filter_changed(!!n->netclient_name, n->netclient_name, path, &error_abort); g_free(path); /* disable event notification to avoid events flooding */ nc->rxfilter_notify_enabled = 0; } } static intList *get_vlan_table(VirtIONet *n) { intList *list, *entry; int i, j; list = NULL; for (i = 0; i < MAX_VLAN >> 5; i++) { for (j = 0; n->vlans[i] && j <= 0x1f; j++) { if (n->vlans[i] & (1U << j)) { entry = g_malloc0(sizeof(*entry)); entry->value = (i << 5) + j; entry->next = list; list = entry; } } } return list; } static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc) { VirtIONet *n = qemu_get_nic_opaque(nc); VirtIODevice *vdev = VIRTIO_DEVICE(n); RxFilterInfo *info; strList *str_list, *entry; int i; info = g_malloc0(sizeof(*info)); info->name = g_strdup(nc->name); info->promiscuous = n->promisc; if (n->nouni) { info->unicast = RX_STATE_NONE; } else if (n->alluni) { info->unicast = RX_STATE_ALL; } else { info->unicast = RX_STATE_NORMAL; } if (n->nomulti) { info->multicast = RX_STATE_NONE; } else if (n->allmulti) { info->multicast = RX_STATE_ALL; } else { info->multicast = RX_STATE_NORMAL; } info->broadcast_allowed = n->nobcast; info->multicast_overflow = n->mac_table.multi_overflow; info->unicast_overflow = n->mac_table.uni_overflow; info->main_mac = qemu_mac_strdup_printf(n->mac); str_list = NULL; for (i = 0; i < n->mac_table.first_multi; i++) { entry = g_malloc0(sizeof(*entry)); entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); entry->next = str_list; str_list = entry; } info->unicast_table = str_list; str_list = NULL; for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { entry = g_malloc0(sizeof(*entry)); entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN); entry->next = str_list; str_list = entry; } info->multicast_table = str_list; info->vlan_table = get_vlan_table(n); if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) { info->vlan = RX_STATE_ALL; } else if (!info->vlan_table) { info->vlan = RX_STATE_NONE; } else { info->vlan = RX_STATE_NORMAL; } /* enable event notification after query */ nc->rxfilter_notify_enabled = 1; return info; } static void virtio_net_reset(VirtIODevice *vdev) { VirtIONet *n = VIRTIO_NET(vdev); /* Reset back to compatibility mode */ n->promisc = 1; n->allmulti = 0; n->alluni = 0; n->nomulti = 0; n->nouni = 0; n->nobcast = 0; /* multiqueue is disabled by default */ n->curr_queues = 1; timer_del(n->announce_timer); n->announce_counter = 0; n->status &= ~VIRTIO_NET_S_ANNOUNCE; /* Flush any MAC and VLAN filter table state */ n->mac_table.in_use = 0; n->mac_table.first_multi = 0; n->mac_table.multi_overflow = 0; n->mac_table.uni_overflow = 0; memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN); memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); memset(n->vlans, 0, MAX_VLAN >> 3); } static void peer_test_vnet_hdr(VirtIONet *n) { NetClientState *nc = qemu_get_queue(n->nic); if (!nc->peer) { return; } n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer); } static int peer_has_vnet_hdr(VirtIONet *n) { return n->has_vnet_hdr; } static int peer_has_ufo(VirtIONet *n) { if (!peer_has_vnet_hdr(n)) return 0; n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer); return n->has_ufo; } static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs, int version_1) { int i; NetClientState *nc; n->mergeable_rx_bufs = mergeable_rx_bufs; if (version_1) { n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); } else { n->guest_hdr_len = n->mergeable_rx_bufs ? sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); } for (i = 0; i < n->max_queues; i++) { nc = qemu_get_subqueue(n->nic, i); if (peer_has_vnet_hdr(n) && qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); n->host_hdr_len = n->guest_hdr_len; } } } static int virtio_net_max_tx_queue_size(VirtIONet *n) { NetClientState *peer = n->nic_conf.peers.ncs[0]; /* * Backends other than vhost-user don't support max queue size. */ if (!peer) { return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; } if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) { return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE; } return VIRTQUEUE_MAX_SIZE; } static int peer_attach(VirtIONet *n, int index) { NetClientState *nc = qemu_get_subqueue(n->nic, index); if (!nc->peer) { return 0; } if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { vhost_set_vring_enable(nc->peer, 1); } if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { return 0; } if (n->max_queues == 1) { return 0; } return tap_enable(nc->peer); } static int peer_detach(VirtIONet *n, int index) { NetClientState *nc = qemu_get_subqueue(n->nic, index); if (!nc->peer) { return 0; } if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) { vhost_set_vring_enable(nc->peer, 0); } if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) { return 0; } return tap_disable(nc->peer); } static void virtio_net_set_queues(VirtIONet *n) { int i; int r; if (n->nic->peer_deleted) { return; } for (i = 0; i < n->max_queues; i++) { if (i < n->curr_queues) { r = peer_attach(n, i); assert(!r); } else { r = peer_detach(n, i); assert(!r); } } } static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue); static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features, Error **errp) { VirtIONet *n = VIRTIO_NET(vdev); NetClientState *nc = qemu_get_queue(n->nic); /* Firstly sync all virtio-net possible supported features */ features |= n->host_features; virtio_add_feature(&features, VIRTIO_NET_F_MAC); if (!peer_has_vnet_hdr(n)) { virtio_clear_feature(&features, VIRTIO_NET_F_CSUM); virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4); virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6); virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN); virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM); virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4); virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6); virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN); } if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO); virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO); } if (!get_vhost_net(nc->peer)) { return features; } features = vhost_net_get_features(get_vhost_net(nc->peer), features); vdev->backend_features = features; if (n->mtu_bypass_backend && (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) { features |= (1ULL << VIRTIO_NET_F_MTU); } return features; } static uint64_t virtio_net_bad_features(VirtIODevice *vdev) { uint64_t features = 0; /* Linux kernel 2.6.25. It understood MAC (as everyone must), * but also these: */ virtio_add_feature(&features, VIRTIO_NET_F_MAC); virtio_add_feature(&features, VIRTIO_NET_F_CSUM); virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4); virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6); virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN); return features; } static void virtio_net_apply_guest_offloads(VirtIONet *n) { qemu_set_offload(qemu_get_queue(n->nic)->peer, !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)), !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)), !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)), !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)), !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO))); } static uint64_t virtio_net_guest_offloads_by_features(uint32_t features) { static const uint64_t guest_offloads_mask = (1ULL << VIRTIO_NET_F_GUEST_CSUM) | (1ULL << VIRTIO_NET_F_GUEST_TSO4) | (1ULL << VIRTIO_NET_F_GUEST_TSO6) | (1ULL << VIRTIO_NET_F_GUEST_ECN) | (1ULL << VIRTIO_NET_F_GUEST_UFO); return guest_offloads_mask & features; } static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n) { VirtIODevice *vdev = VIRTIO_DEVICE(n); return virtio_net_guest_offloads_by_features(vdev->guest_features); } static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features) { VirtIONet *n = VIRTIO_NET(vdev); int i; if (n->mtu_bypass_backend && !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) { features &= ~(1ULL << VIRTIO_NET_F_MTU); } virtio_net_set_multiqueue(n, virtio_has_feature(features, VIRTIO_NET_F_MQ)); virtio_net_set_mrg_rx_bufs(n, virtio_has_feature(features, VIRTIO_NET_F_MRG_RXBUF), virtio_has_feature(features, VIRTIO_F_VERSION_1)); if (n->has_vnet_hdr) { n->curr_guest_offloads = virtio_net_guest_offloads_by_features(features); virtio_net_apply_guest_offloads(n); } for (i = 0; i < n->max_queues; i++) { NetClientState *nc = qemu_get_subqueue(n->nic, i); if (!get_vhost_net(nc->peer)) { continue; } vhost_net_ack_features(get_vhost_net(nc->peer), features); } if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) { memset(n->vlans, 0, MAX_VLAN >> 3); } else { memset(n->vlans, 0xff, MAX_VLAN >> 3); } } static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, struct iovec *iov, unsigned int iov_cnt) { uint8_t on; size_t s; NetClientState *nc = qemu_get_queue(n->nic); s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); if (s != sizeof(on)) { return VIRTIO_NET_ERR; } if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) { n->promisc = on; } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { n->allmulti = on; } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { n->alluni = on; } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { n->nomulti = on; } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { n->nouni = on; } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { n->nobcast = on; } else { return VIRTIO_NET_ERR; } rxfilter_notify(nc); return VIRTIO_NET_OK; } static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd, struct iovec *iov, unsigned int iov_cnt) { VirtIODevice *vdev = VIRTIO_DEVICE(n); uint64_t offloads; size_t s; if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { return VIRTIO_NET_ERR; } s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads)); if (s != sizeof(offloads)) { return VIRTIO_NET_ERR; } if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) { uint64_t supported_offloads; offloads = virtio_ldq_p(vdev, &offloads); if (!n->has_vnet_hdr) { return VIRTIO_NET_ERR; } supported_offloads = virtio_net_supported_guest_offloads(n); if (offloads & ~supported_offloads) { return VIRTIO_NET_ERR; } n->curr_guest_offloads = offloads; virtio_net_apply_guest_offloads(n); return VIRTIO_NET_OK; } else { return VIRTIO_NET_ERR; } } static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, struct iovec *iov, unsigned int iov_cnt) { VirtIODevice *vdev = VIRTIO_DEVICE(n); struct virtio_net_ctrl_mac mac_data; size_t s; NetClientState *nc = qemu_get_queue(n->nic); if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) { if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { return VIRTIO_NET_ERR; } s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); assert(s == sizeof(n->mac)); qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); rxfilter_notify(nc); return VIRTIO_NET_OK; } if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) { return VIRTIO_NET_ERR; } int in_use = 0; int first_multi = 0; uint8_t uni_overflow = 0; uint8_t multi_overflow = 0; uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, sizeof(mac_data.entries)); mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); if (s != sizeof(mac_data.entries)) { goto error; } iov_discard_front(&iov, &iov_cnt, s); if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) { goto error; } if (mac_data.entries <= MAC_TABLE_ENTRIES) { s = iov_to_buf(iov, iov_cnt, 0, macs, mac_data.entries * ETH_ALEN); if (s != mac_data.entries * ETH_ALEN) { goto error; } in_use += mac_data.entries; } else { uni_overflow = 1; } iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); first_multi = in_use; s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries, sizeof(mac_data.entries)); mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries); if (s != sizeof(mac_data.entries)) { goto error; } iov_discard_front(&iov, &iov_cnt, s); if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) { goto error; } if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) { s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN], mac_data.entries * ETH_ALEN); if (s != mac_data.entries * ETH_ALEN) { goto error; } in_use += mac_data.entries; } else { multi_overflow = 1; } n->mac_table.in_use = in_use; n->mac_table.first_multi = first_multi; n->mac_table.uni_overflow = uni_overflow; n->mac_table.multi_overflow = multi_overflow; memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN); g_free(macs); rxfilter_notify(nc); return VIRTIO_NET_OK; error: g_free(macs); return VIRTIO_NET_ERR; } static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, struct iovec *iov, unsigned int iov_cnt) { VirtIODevice *vdev = VIRTIO_DEVICE(n); uint16_t vid; size_t s; NetClientState *nc = qemu_get_queue(n->nic); s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); vid = virtio_lduw_p(vdev, &vid); if (s != sizeof(vid)) { return VIRTIO_NET_ERR; } if (vid >= MAX_VLAN) return VIRTIO_NET_ERR; if (cmd == VIRTIO_NET_CTRL_VLAN_ADD) n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); else return VIRTIO_NET_ERR; rxfilter_notify(nc); return VIRTIO_NET_OK; } static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd, struct iovec *iov, unsigned int iov_cnt) { if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK && n->status & VIRTIO_NET_S_ANNOUNCE) { n->status &= ~VIRTIO_NET_S_ANNOUNCE; if (n->announce_counter) { timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + self_announce_delay(n->announce_counter)); } return VIRTIO_NET_OK; } else { return VIRTIO_NET_ERR; } } static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, struct iovec *iov, unsigned int iov_cnt) { VirtIODevice *vdev = VIRTIO_DEVICE(n); struct virtio_net_ctrl_mq mq; size_t s; uint16_t queues; s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); if (s != sizeof(mq)) { return VIRTIO_NET_ERR; } if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) { return VIRTIO_NET_ERR; } queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs); if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || queues > n->max_queues || !n->multiqueue) { return VIRTIO_NET_ERR; } n->curr_queues = queues; /* stop the backend before changing the number of queues to avoid handling a * disabled queue */ virtio_net_set_status(vdev, vdev->status); virtio_net_set_queues(n); return VIRTIO_NET_OK; } static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = VIRTIO_NET(vdev); struct virtio_net_ctrl_hdr ctrl; virtio_net_ctrl_ack status = VIRTIO_NET_ERR; VirtQueueElement *elem; size_t s; struct iovec *iov, *iov2; unsigned int iov_cnt; for (;;) { elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { break; } if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) || iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) { virtio_error(vdev, "virtio-net ctrl missing headers"); virtqueue_detach_element(vq, elem, 0); g_free(elem); break; } iov_cnt = elem->out_num; iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num); s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); iov_discard_front(&iov, &iov_cnt, sizeof(ctrl)); if (s != sizeof(ctrl)) { status = VIRTIO_NET_ERR; } else if (ctrl.class == VIRTIO_NET_CTRL_RX) { status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) { status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt); } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) { status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt); } s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status)); assert(s == sizeof(status)); virtqueue_push(vq, elem, sizeof(status)); virtio_notify(vdev, vq); g_free(iov2); g_free(elem); } } /* RX */ static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = VIRTIO_NET(vdev); int queue_index = vq2q(virtio_get_queue_index(vq)); qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); } static int virtio_net_can_receive(NetClientState *nc) { VirtIONet *n = qemu_get_nic_opaque(nc); VirtIODevice *vdev = VIRTIO_DEVICE(n); VirtIONetQueue *q = virtio_net_get_subqueue(nc); if (!vdev->vm_running) { return 0; } if (nc->queue_index >= n->curr_queues) { return 0; } if (!virtio_queue_ready(q->rx_vq) || !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { return 0; } return 1; } static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) { VirtIONet *n = q->n; if (virtio_queue_empty(q->rx_vq) || (n->mergeable_rx_bufs && !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { virtio_queue_set_notification(q->rx_vq, 1); /* To avoid a race condition where the guest has made some buffers * available after the above check but before notification was * enabled, check for available buffers again. */ if (virtio_queue_empty(q->rx_vq) || (n->mergeable_rx_bufs && !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { return 0; } } virtio_queue_set_notification(q->rx_vq, 0); return 1; } static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr) { virtio_tswap16s(vdev, &hdr->hdr_len); virtio_tswap16s(vdev, &hdr->gso_size); virtio_tswap16s(vdev, &hdr->csum_start); virtio_tswap16s(vdev, &hdr->csum_offset); } /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so * it never finds out that the packets don't have valid checksums. This * causes dhclient to get upset. Fedora's carried a patch for ages to * fix this with Xen but it hasn't appeared in an upstream release of * dhclient yet. * * To avoid breaking existing guests, we catch udp packets and add * checksums. This is terrible but it's better than hacking the guest * kernels. * * N.B. if we introduce a zero-copy API, this operation is no longer free so * we should provide a mechanism to disable it to avoid polluting the host * cache. */ static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, uint8_t *buf, size_t size) { if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ (size > 27 && size < 1500) && /* normal sized MTU */ (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ (buf[23] == 17) && /* ip.protocol == UDP */ (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ net_checksum_calculate(buf, size); hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; } } static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, const void *buf, size_t size) { if (n->has_vnet_hdr) { /* FIXME this cast is evil */ void *wbuf = (void *)buf; work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, size - n->host_hdr_len); if (n->needs_vnet_hdr_swap) { virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf); } iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); } else { struct virtio_net_hdr hdr = { .flags = 0, .gso_type = VIRTIO_NET_HDR_GSO_NONE }; iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); } } static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) { static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; static const uint8_t vlan[] = {0x81, 0x00}; uint8_t *ptr = (uint8_t *)buf; int i; if (n->promisc) return 1; ptr += n->host_hdr_len; if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { int vid = lduw_be_p(ptr + 14) & 0xfff; if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) return 0; } if (ptr[0] & 1) { // multicast if (!memcmp(ptr, bcast, sizeof(bcast))) { return !n->nobcast; } else if (n->nomulti) { return 0; } else if (n->allmulti || n->mac_table.multi_overflow) { return 1; } for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) { if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { return 1; } } } else { // unicast if (n->nouni) { return 0; } else if (n->alluni || n->mac_table.uni_overflow) { return 1; } else if (!memcmp(ptr, n->mac, ETH_ALEN)) { return 1; } for (i = 0; i < n->mac_table.first_multi; i++) { if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) { return 1; } } } return 0; } static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, size_t size) { VirtIONet *n = qemu_get_nic_opaque(nc); VirtIONetQueue *q = virtio_net_get_subqueue(nc); VirtIODevice *vdev = VIRTIO_DEVICE(n); struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE]; struct virtio_net_hdr_mrg_rxbuf mhdr; unsigned mhdr_cnt = 0; size_t offset, i, guest_offset; if (!virtio_net_can_receive(nc)) { return -1; } /* hdr_len refers to the header we supply to the guest */ if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) { return 0; } if (!receive_filter(n, buf, size)) return size; offset = i = 0; while (offset < size) { VirtQueueElement *elem; int len, total; const struct iovec *sg; total = 0; elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement)); if (!elem) { if (i) { virtio_error(vdev, "virtio-net unexpected empty queue: " "i %zd mergeable %d offset %zd, size %zd, " "guest hdr len %zd, host hdr len %zd " "guest features 0x%" PRIx64, i, n->mergeable_rx_bufs, offset, size, n->guest_hdr_len, n->host_hdr_len, vdev->guest_features); } return -1; } if (elem->in_num < 1) { virtio_error(vdev, "virtio-net receive queue contains no in buffers"); virtqueue_detach_element(q->rx_vq, elem, 0); g_free(elem); return -1; } sg = elem->in_sg; if (i == 0) { assert(offset == 0); if (n->mergeable_rx_bufs) { mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), sg, elem->in_num, offsetof(typeof(mhdr), num_buffers), sizeof(mhdr.num_buffers)); } receive_header(n, sg, elem->in_num, buf, size); offset = n->host_hdr_len; total += n->guest_hdr_len; guest_offset = n->guest_hdr_len; } else { guest_offset = 0; } /* copy in packet. ugh */ len = iov_from_buf(sg, elem->in_num, guest_offset, buf + offset, size - offset); total += len; offset += len; /* If buffers can't be merged, at this point we * must have consumed the complete packet. * Otherwise, drop it. */ if (!n->mergeable_rx_bufs && offset < size) { virtqueue_unpop(q->rx_vq, elem, total); g_free(elem); return size; } /* signal other side */ virtqueue_fill(q->rx_vq, elem, total, i++); g_free(elem); } if (mhdr_cnt) { virtio_stw_p(vdev, &mhdr.num_buffers, i); iov_from_buf(mhdr_sg, mhdr_cnt, 0, &mhdr.num_buffers, sizeof mhdr.num_buffers); } virtqueue_flush(q->rx_vq, i); virtio_notify(vdev, q->rx_vq); return size; } static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) { ssize_t r; rcu_read_lock(); r = virtio_net_receive_rcu(nc, buf, size); rcu_read_unlock(); return r; } static int32_t virtio_net_flush_tx(VirtIONetQueue *q); static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) { VirtIONet *n = qemu_get_nic_opaque(nc); VirtIONetQueue *q = virtio_net_get_subqueue(nc); VirtIODevice *vdev = VIRTIO_DEVICE(n); virtqueue_push(q->tx_vq, q->async_tx.elem, 0); virtio_notify(vdev, q->tx_vq); g_free(q->async_tx.elem); q->async_tx.elem = NULL; virtio_queue_set_notification(q->tx_vq, 1); virtio_net_flush_tx(q); } /* TX */ static int32_t virtio_net_flush_tx(VirtIONetQueue *q) { VirtIONet *n = q->n; VirtIODevice *vdev = VIRTIO_DEVICE(n); VirtQueueElement *elem; int32_t num_packets = 0; int queue_index = vq2q(virtio_get_queue_index(q->tx_vq)); if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { return num_packets; } if (q->async_tx.elem) { virtio_queue_set_notification(q->tx_vq, 0); return num_packets; } for (;;) { ssize_t ret; unsigned int out_num; struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg; struct virtio_net_hdr_mrg_rxbuf mhdr; elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement)); if (!elem) { break; } out_num = elem->out_num; out_sg = elem->out_sg; if (out_num < 1) { virtio_error(vdev, "virtio-net header not in first element"); virtqueue_detach_element(q->tx_vq, elem, 0); g_free(elem); return -EINVAL; } if (n->has_vnet_hdr) { if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) < n->guest_hdr_len) { virtio_error(vdev, "virtio-net header incorrect"); virtqueue_detach_element(q->tx_vq, elem, 0); g_free(elem); return -EINVAL; } if (n->needs_vnet_hdr_swap) { virtio_net_hdr_swap(vdev, (void *) &mhdr); sg2[0].iov_base = &mhdr; sg2[0].iov_len = n->guest_hdr_len; out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1, out_sg, out_num, n->guest_hdr_len, -1); if (out_num == VIRTQUEUE_MAX_SIZE) { goto drop; } out_num += 1; out_sg = sg2; } } /* * If host wants to see the guest header as is, we can * pass it on unchanged. Otherwise, copy just the parts * that host is interested in. */ assert(n->host_hdr_len <= n->guest_hdr_len); if (n->host_hdr_len != n->guest_hdr_len) { unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg), out_sg, out_num, 0, n->host_hdr_len); sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, out_sg, out_num, n->guest_hdr_len, -1); out_num = sg_num; out_sg = sg; } ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), out_sg, out_num, virtio_net_tx_complete); if (ret == 0) { virtio_queue_set_notification(q->tx_vq, 0); q->async_tx.elem = elem; return -EBUSY; } drop: virtqueue_push(q->tx_vq, elem, 0); virtio_notify(vdev, q->tx_vq); g_free(elem); if (++num_packets >= n->tx_burst) { break; } } return num_packets; } static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = VIRTIO_NET(vdev); VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { virtio_net_drop_tx_queue_data(vdev, vq); return; } /* This happens when device was stopped but VCPU wasn't. */ if (!vdev->vm_running) { q->tx_waiting = 1; return; } if (q->tx_waiting) { virtio_queue_set_notification(vq, 1); timer_del(q->tx_timer); q->tx_waiting = 0; if (virtio_net_flush_tx(q) == -EINVAL) { return; } } else { timer_mod(q->tx_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout); q->tx_waiting = 1; virtio_queue_set_notification(vq, 0); } } static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) { VirtIONet *n = VIRTIO_NET(vdev); VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) { virtio_net_drop_tx_queue_data(vdev, vq); return; } if (unlikely(q->tx_waiting)) { return; } q->tx_waiting = 1; /* This happens when device was stopped but VCPU wasn't. */ if (!vdev->vm_running) { return; } virtio_queue_set_notification(vq, 0); qemu_bh_schedule(q->tx_bh); } static void virtio_net_tx_timer(void *opaque) { VirtIONetQueue *q = opaque; VirtIONet *n = q->n; VirtIODevice *vdev = VIRTIO_DEVICE(n); /* This happens when device was stopped but BH wasn't. */ if (!vdev->vm_running) { /* Make sure tx waiting is set, so we'll run when restarted. */ assert(q->tx_waiting); return; } q->tx_waiting = 0; /* Just in case the driver is not ready on more */ if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) { return; } virtio_queue_set_notification(q->tx_vq, 1); virtio_net_flush_tx(q); } static void virtio_net_tx_bh(void *opaque) { VirtIONetQueue *q = opaque; VirtIONet *n = q->n; VirtIODevice *vdev = VIRTIO_DEVICE(n); int32_t ret; /* This happens when device was stopped but BH wasn't. */ if (!vdev->vm_running) { /* Make sure tx waiting is set, so we'll run when restarted. */ assert(q->tx_waiting); return; } q->tx_waiting = 0; /* Just in case the driver is not ready on more */ if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) { return; } ret = virtio_net_flush_tx(q); if (ret == -EBUSY || ret == -EINVAL) { return; /* Notification re-enable handled by tx_complete or device * broken */ } /* If we flush a full burst of packets, assume there are * more coming and immediately reschedule */ if (ret >= n->tx_burst) { qemu_bh_schedule(q->tx_bh); q->tx_waiting = 1; return; } /* If less than a full burst, re-enable notification and flush * anything that may have come in while we weren't looking. If * we find something, assume the guest is still active and reschedule */ virtio_queue_set_notification(q->tx_vq, 1); ret = virtio_net_flush_tx(q); if (ret == -EINVAL) { return; } else if (ret > 0) { virtio_queue_set_notification(q->tx_vq, 0); qemu_bh_schedule(q->tx_bh); q->tx_waiting = 1; } } static void virtio_net_add_queue(VirtIONet *n, int index) { VirtIODevice *vdev = VIRTIO_DEVICE(n); n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size, virtio_net_handle_rx); if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { n->vqs[index].tx_vq = virtio_add_queue(vdev, n->net_conf.tx_queue_size, virtio_net_handle_tx_timer); n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, &n->vqs[index]); } else { n->vqs[index].tx_vq = virtio_add_queue(vdev, n->net_conf.tx_queue_size, virtio_net_handle_tx_bh); n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]); } n->vqs[index].tx_waiting = 0; n->vqs[index].n = n; } static void virtio_net_del_queue(VirtIONet *n, int index) { VirtIODevice *vdev = VIRTIO_DEVICE(n); VirtIONetQueue *q = &n->vqs[index]; NetClientState *nc = qemu_get_subqueue(n->nic, index); qemu_purge_queued_packets(nc); virtio_del_queue(vdev, index * 2); if (q->tx_timer) { timer_del(q->tx_timer); timer_free(q->tx_timer); q->tx_timer = NULL; } else { qemu_bh_delete(q->tx_bh); q->tx_bh = NULL; } q->tx_waiting = 0; virtio_del_queue(vdev, index * 2 + 1); } static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues) { VirtIODevice *vdev = VIRTIO_DEVICE(n); int old_num_queues = virtio_get_num_queues(vdev); int new_num_queues = new_max_queues * 2 + 1; int i; assert(old_num_queues >= 3); assert(old_num_queues % 2 == 1); if (old_num_queues == new_num_queues) { return; } /* * We always need to remove and add ctrl vq if * old_num_queues != new_num_queues. Remove ctrl_vq first, * and then we only enter one of the following too loops. */ virtio_del_queue(vdev, old_num_queues - 1); for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) { /* new_num_queues < old_num_queues */ virtio_net_del_queue(n, i / 2); } for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) { /* new_num_queues > old_num_queues */ virtio_net_add_queue(n, i / 2); } /* add ctrl_vq last */ n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); } static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) { int max = multiqueue ? n->max_queues : 1; n->multiqueue = multiqueue; virtio_net_change_num_queues(n, max); virtio_net_set_queues(n); } static int virtio_net_post_load_device(void *opaque, int version_id) { VirtIONet *n = opaque; VirtIODevice *vdev = VIRTIO_DEVICE(n); int i, link_down; virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs, virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)); /* MAC_TABLE_ENTRIES may be different from the saved image */ if (n->mac_table.in_use > MAC_TABLE_ENTRIES) { n->mac_table.in_use = 0; } if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { n->curr_guest_offloads = virtio_net_supported_guest_offloads(n); } if (peer_has_vnet_hdr(n)) { virtio_net_apply_guest_offloads(n); } virtio_net_set_queues(n); /* Find the first multicast entry in the saved MAC filter */ for (i = 0; i < n->mac_table.in_use; i++) { if (n->mac_table.macs[i * ETH_ALEN] & 1) { break; } } n->mac_table.first_multi = i; /* nc.link_down can't be migrated, so infer link_down according * to link status bit in n->status */ link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0; for (i = 0; i < n->max_queues; i++) { qemu_get_subqueue(n->nic, i)->link_down = link_down; } if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) { n->announce_counter = SELF_ANNOUNCE_ROUNDS; timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL)); } return 0; } /* tx_waiting field of a VirtIONetQueue */ static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = { .name = "virtio-net-queue-tx_waiting", .fields = (VMStateField[]) { VMSTATE_UINT32(tx_waiting, VirtIONetQueue), VMSTATE_END_OF_LIST() }, }; static bool max_queues_gt_1(void *opaque, int version_id) { return VIRTIO_NET(opaque)->max_queues > 1; } static bool has_ctrl_guest_offloads(void *opaque, int version_id) { return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque), VIRTIO_NET_F_CTRL_GUEST_OFFLOADS); } static bool mac_table_fits(void *opaque, int version_id) { return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES; } static bool mac_table_doesnt_fit(void *opaque, int version_id) { return !mac_table_fits(opaque, version_id); } /* This temporary type is shared by all the WITH_TMP methods * although only some fields are used by each. */ struct VirtIONetMigTmp { VirtIONet *parent; VirtIONetQueue *vqs_1; uint16_t curr_queues_1; uint8_t has_ufo; uint32_t has_vnet_hdr; }; /* The 2nd and subsequent tx_waiting flags are loaded later than * the 1st entry in the queues and only if there's more than one * entry. We use the tmp mechanism to calculate a temporary * pointer and count and also validate the count. */ static int virtio_net_tx_waiting_pre_save(void *opaque) { struct VirtIONetMigTmp *tmp = opaque; tmp->vqs_1 = tmp->parent->vqs + 1; tmp->curr_queues_1 = tmp->parent->curr_queues - 1; if (tmp->parent->curr_queues == 0) { tmp->curr_queues_1 = 0; } return 0; } static int virtio_net_tx_waiting_pre_load(void *opaque) { struct VirtIONetMigTmp *tmp = opaque; /* Reuse the pointer setup from save */ virtio_net_tx_waiting_pre_save(opaque); if (tmp->parent->curr_queues > tmp->parent->max_queues) { error_report("virtio-net: curr_queues %x > max_queues %x", tmp->parent->curr_queues, tmp->parent->max_queues); return -EINVAL; } return 0; /* all good */ } static const VMStateDescription vmstate_virtio_net_tx_waiting = { .name = "virtio-net-tx_waiting", .pre_load = virtio_net_tx_waiting_pre_load, .pre_save = virtio_net_tx_waiting_pre_save, .fields = (VMStateField[]) { VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp, curr_queues_1, vmstate_virtio_net_queue_tx_waiting, struct VirtIONetQueue), VMSTATE_END_OF_LIST() }, }; /* the 'has_ufo' flag is just tested; if the incoming stream has the * flag set we need to check that we have it */ static int virtio_net_ufo_post_load(void *opaque, int version_id) { struct VirtIONetMigTmp *tmp = opaque; if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) { error_report("virtio-net: saved image requires TUN_F_UFO support"); return -EINVAL; } return 0; } static int virtio_net_ufo_pre_save(void *opaque) { struct VirtIONetMigTmp *tmp = opaque; tmp->has_ufo = tmp->parent->has_ufo; return 0; } static const VMStateDescription vmstate_virtio_net_has_ufo = { .name = "virtio-net-ufo", .post_load = virtio_net_ufo_post_load, .pre_save = virtio_net_ufo_pre_save, .fields = (VMStateField[]) { VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp), VMSTATE_END_OF_LIST() }, }; /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the * flag set we need to check that we have it */ static int virtio_net_vnet_post_load(void *opaque, int version_id) { struct VirtIONetMigTmp *tmp = opaque; if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) { error_report("virtio-net: saved image requires vnet_hdr=on"); return -EINVAL; } return 0; } static int virtio_net_vnet_pre_save(void *opaque) { struct VirtIONetMigTmp *tmp = opaque; tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr; return 0; } static const VMStateDescription vmstate_virtio_net_has_vnet = { .name = "virtio-net-vnet", .post_load = virtio_net_vnet_post_load, .pre_save = virtio_net_vnet_pre_save, .fields = (VMStateField[]) { VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp), VMSTATE_END_OF_LIST() }, }; static const VMStateDescription vmstate_virtio_net_device = { .name = "virtio-net-device", .version_id = VIRTIO_NET_VM_VERSION, .minimum_version_id = VIRTIO_NET_VM_VERSION, .post_load = virtio_net_post_load_device, .fields = (VMStateField[]) { VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN), VMSTATE_STRUCT_POINTER(vqs, VirtIONet, vmstate_virtio_net_queue_tx_waiting, VirtIONetQueue), VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet), VMSTATE_UINT16(status, VirtIONet), VMSTATE_UINT8(promisc, VirtIONet), VMSTATE_UINT8(allmulti, VirtIONet), VMSTATE_UINT32(mac_table.in_use, VirtIONet), /* Guarded pair: If it fits we load it, else we throw it away * - can happen if source has a larger MAC table.; post-load * sets flags in this case. */ VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet, 0, mac_table_fits, mac_table.in_use, ETH_ALEN), VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0, mac_table.in_use, ETH_ALEN), /* Note: This is an array of uint32's that's always been saved as a * buffer; hold onto your endiannesses; it's actually used as a bitmap * but based on the uint. */ VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3), VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, vmstate_virtio_net_has_vnet), VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet), VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet), VMSTATE_UINT8(alluni, VirtIONet), VMSTATE_UINT8(nomulti, VirtIONet), VMSTATE_UINT8(nouni, VirtIONet), VMSTATE_UINT8(nobcast, VirtIONet), VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, vmstate_virtio_net_has_ufo), VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0, vmstate_info_uint16_equal, uint16_t), VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1), VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp, vmstate_virtio_net_tx_waiting), VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet, has_ctrl_guest_offloads), VMSTATE_END_OF_LIST() }, }; static NetClientInfo net_virtio_info = { .type = NET_CLIENT_DRIVER_NIC, .size = sizeof(NICState), .can_receive = virtio_net_can_receive, .receive = virtio_net_receive, .link_status_changed = virtio_net_set_link_status, .query_rx_filter = virtio_net_query_rxfilter, }; static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) { VirtIONet *n = VIRTIO_NET(vdev); NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); assert(n->vhost_started); return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx); } static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask) { VirtIONet *n = VIRTIO_NET(vdev); NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); assert(n->vhost_started); vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask); } static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features) { int i, config_size = 0; virtio_add_feature(&host_features, VIRTIO_NET_F_MAC); for (i = 0; feature_sizes[i].flags != 0; i++) { if (host_features & feature_sizes[i].flags) { config_size = MAX(feature_sizes[i].end, config_size); } } n->config_size = config_size; } void virtio_net_set_netclient_name(VirtIONet *n, const char *name, const char *type) { /* * The name can be NULL, the netclient name will be type.x. */ assert(type != NULL); g_free(n->netclient_name); g_free(n->netclient_type); n->netclient_name = g_strdup(name); n->netclient_type = g_strdup(type); } static void virtio_net_device_realize(DeviceState *dev, Error **errp) { VirtIODevice *vdev = VIRTIO_DEVICE(dev); VirtIONet *n = VIRTIO_NET(dev); NetClientState *nc; int i; if (n->net_conf.mtu) { n->host_features |= (0x1 << VIRTIO_NET_F_MTU); } virtio_net_set_config_size(n, n->host_features); virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); /* * We set a lower limit on RX queue size to what it always was. * Guests that want a smaller ring can always resize it without * help from us (using virtio 1 and up). */ if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE || n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE || !is_power_of_2(n->net_conf.rx_queue_size)) { error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), " "must be a power of 2 between %d and %d.", n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE, VIRTQUEUE_MAX_SIZE); virtio_cleanup(vdev); return; } if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE || n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE || !is_power_of_2(n->net_conf.tx_queue_size)) { error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), " "must be a power of 2 between %d and %d", n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE, VIRTQUEUE_MAX_SIZE); virtio_cleanup(vdev); return; } n->max_queues = MAX(n->nic_conf.peers.queues, 1); if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) { error_setg(errp, "Invalid number of queues (= %" PRIu32 "), " "must be a positive integer less than %d.", n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2); virtio_cleanup(vdev); return; } n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); n->curr_queues = 1; n->tx_timeout = n->net_conf.txtimer; if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer") && strcmp(n->net_conf.tx, "bh")) { error_report("virtio-net: " "Unknown option tx=%s, valid options: \"timer\" \"bh\"", n->net_conf.tx); error_report("Defaulting to \"bh\""); } n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n), n->net_conf.tx_queue_size); for (i = 0; i < n->max_queues; i++) { virtio_net_add_queue(n, i); } n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); qemu_macaddr_default_if_unset(&n->nic_conf.macaddr); memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac)); n->status = VIRTIO_NET_S_LINK_UP; n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, virtio_net_announce_timer, n); if (n->netclient_type) { /* * Happen when virtio_net_set_netclient_name has been called. */ n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, n->netclient_type, n->netclient_name, n); } else { n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf, object_get_typename(OBJECT(dev)), dev->id, n); } peer_test_vnet_hdr(n); if (peer_has_vnet_hdr(n)) { for (i = 0; i < n->max_queues; i++) { qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true); } n->host_hdr_len = sizeof(struct virtio_net_hdr); } else { n->host_hdr_len = 0; } qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a); n->vqs[0].tx_waiting = 0; n->tx_burst = n->net_conf.txburst; virtio_net_set_mrg_rx_bufs(n, 0, 0); n->promisc = 1; /* for compatibility */ n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); n->vlans = g_malloc0(MAX_VLAN >> 3); nc = qemu_get_queue(n->nic); nc->rxfilter_notify_enabled = 1; n->qdev = dev; } static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) { VirtIODevice *vdev = VIRTIO_DEVICE(dev); VirtIONet *n = VIRTIO_NET(dev); int i, max_queues; /* This will stop vhost backend if appropriate. */ virtio_net_set_status(vdev, 0); g_free(n->netclient_name); n->netclient_name = NULL; g_free(n->netclient_type); n->netclient_type = NULL; g_free(n->mac_table.macs); g_free(n->vlans); max_queues = n->multiqueue ? n->max_queues : 1; for (i = 0; i < max_queues; i++) { virtio_net_del_queue(n, i); } timer_del(n->announce_timer); timer_free(n->announce_timer); g_free(n->vqs); qemu_del_nic(n->nic); virtio_cleanup(vdev); } static void virtio_net_instance_init(Object *obj) { VirtIONet *n = VIRTIO_NET(obj); /* * The default config_size is sizeof(struct virtio_net_config). * Can be overriden with virtio_net_set_config_size. */ n->config_size = sizeof(struct virtio_net_config); device_add_bootindex_property(obj, &n->nic_conf.bootindex, "bootindex", "/ethernet-phy@0", DEVICE(n), NULL); } static int virtio_net_pre_save(void *opaque) { VirtIONet *n = opaque; /* At this point, backend must be stopped, otherwise * it might keep writing to memory. */ assert(!n->vhost_started); return 0; } static const VMStateDescription vmstate_virtio_net = { .name = "virtio-net", .minimum_version_id = VIRTIO_NET_VM_VERSION, .version_id = VIRTIO_NET_VM_VERSION, .fields = (VMStateField[]) { VMSTATE_VIRTIO_DEVICE, VMSTATE_END_OF_LIST() }, .pre_save = virtio_net_pre_save, }; static Property virtio_net_properties[] = { DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true), DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features, VIRTIO_NET_F_GUEST_CSUM, true), DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true), DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features, VIRTIO_NET_F_GUEST_TSO4, true), DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features, VIRTIO_NET_F_GUEST_TSO6, true), DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features, VIRTIO_NET_F_GUEST_ECN, true), DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features, VIRTIO_NET_F_GUEST_UFO, true), DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features, VIRTIO_NET_F_GUEST_ANNOUNCE, true), DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features, VIRTIO_NET_F_HOST_TSO4, true), DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features, VIRTIO_NET_F_HOST_TSO6, true), DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features, VIRTIO_NET_F_HOST_ECN, true), DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features, VIRTIO_NET_F_HOST_UFO, true), DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features, VIRTIO_NET_F_MRG_RXBUF, true), DEFINE_PROP_BIT("status", VirtIONet, host_features, VIRTIO_NET_F_STATUS, true), DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features, VIRTIO_NET_F_CTRL_VQ, true), DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features, VIRTIO_NET_F_CTRL_RX, true), DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features, VIRTIO_NET_F_CTRL_VLAN, true), DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features, VIRTIO_NET_F_CTRL_RX_EXTRA, true), DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features, VIRTIO_NET_F_CTRL_MAC_ADDR, true), DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true), DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false), DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf), DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer, TX_TIMER_INTERVAL), DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST), DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx), DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE), DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE), DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0), DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend, true), DEFINE_PROP_END_OF_LIST(), }; static void virtio_net_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); dc->props = virtio_net_properties; dc->vmsd = &vmstate_virtio_net; set_bit(DEVICE_CATEGORY_NETWORK, dc->categories); vdc->realize = virtio_net_device_realize; vdc->unrealize = virtio_net_device_unrealize; vdc->get_config = virtio_net_get_config; vdc->set_config = virtio_net_set_config; vdc->get_features = virtio_net_get_features; vdc->set_features = virtio_net_set_features; vdc->bad_features = virtio_net_bad_features; vdc->reset = virtio_net_reset; vdc->set_status = virtio_net_set_status; vdc->guest_notifier_mask = virtio_net_guest_notifier_mask; vdc->guest_notifier_pending = virtio_net_guest_notifier_pending; vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO); vdc->vmsd = &vmstate_virtio_net_device; } static const TypeInfo virtio_net_info = { .name = TYPE_VIRTIO_NET, .parent = TYPE_VIRTIO_DEVICE, .instance_size = sizeof(VirtIONet), .instance_init = virtio_net_instance_init, .class_init = virtio_net_class_init, }; static void virtio_register_types(void) { type_register_static(&virtio_net_info); } type_init(virtio_register_types)