/* * 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/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" #define VIRTIO_NET_VM_VERSION 11 #define MAC_TABLE_ENTRIES 64 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ /* * 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)}, {} }; 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); 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_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) && !virtio_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; /* 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); } 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 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_vhost_status(n, status); for (i = 0; i < n->max_queues; i++) { q = &n->vqs[i]; if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { queue_status = 0; } else { queue_status = status; } if (!q->tx_waiting) { continue; } if (virtio_net_started(n, queue_status) && !n->vhost_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); } } } } 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_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 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_OPTIONS_KIND_TAP) { 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_OPTIONS_KIND_TAP) { return 0; } return tap_disable(nc->peer); } static void virtio_net_set_queues(VirtIONet *n) { int i; int r; 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) { 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)) { virtio_add_feature(&features, VIRTIO_F_VERSION_1); return features; } return vhost_net_get_features(get_vhost_net(nc->peer), 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; 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_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; 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; while (virtqueue_pop(vq, &elem)) { if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) { error_report("virtio-net ctrl missing headers"); exit(1); } 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); } } /* 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); 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 = be16_to_cpup((uint16_t *)(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(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 = elem.in_sg; total = 0; if (virtqueue_pop(q->rx_vq, &elem) == 0) { if (i == 0) return -1; error_report("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); exit(1); } if (elem.in_num < 1) { error_report("virtio-net receive queue contains no in buffers"); exit(1); } 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) { #if 0 error_report("virtio-net truncated non-mergeable packet: " "i %zd mergeable %d offset %zd, size %zd, " "guest hdr len %zd, host hdr len %zd", i, n->mergeable_rx_bufs, offset, size, n->guest_hdr_len, n->host_hdr_len); #endif return size; } /* signal other side */ virtqueue_fill(q->rx_vq, &elem, total, i++); } 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 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); q->async_tx.elem.out_num = q->async_tx.len = 0; 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.out_num) { virtio_queue_set_notification(q->tx_vq, 0); return num_packets; } while (virtqueue_pop(q->tx_vq, &elem)) { ssize_t ret, len; unsigned int out_num = elem.out_num; struct iovec *out_sg = &elem.out_sg[0]; struct iovec sg[VIRTQUEUE_MAX_SIZE]; if (out_num < 1) { error_report("virtio-net header not in first element"); exit(1); } if (n->has_vnet_hdr) { if (out_sg[0].iov_len < n->guest_hdr_len) { error_report("virtio-net header incorrect"); exit(1); } virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base); } /* * 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; } len = n->guest_hdr_len; 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; q->async_tx.len = len; return -EBUSY; } len += ret; virtqueue_push(q->tx_vq, &elem, 0); virtio_notify(vdev, q->tx_vq); 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))]; /* 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; virtio_net_flush_tx(q); } 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(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) { return; /* Notification re-enable handled by tx_complete */ } /* 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); if (virtio_net_flush_tx(q) > 0) { virtio_queue_set_notification(q->tx_vq, 0); qemu_bh_schedule(q->tx_bh); q->tx_waiting = 1; } } static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue) { n->multiqueue = multiqueue; virtio_net_set_queues(n); } static void virtio_net_save(QEMUFile *f, void *opaque) { VirtIONet *n = opaque; VirtIODevice *vdev = VIRTIO_DEVICE(n); /* At this point, backend must be stopped, otherwise * it might keep writing to memory. */ assert(!n->vhost_started); virtio_save(vdev, f); } static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f) { VirtIONet *n = VIRTIO_NET(vdev); int i; qemu_put_buffer(f, n->mac, ETH_ALEN); qemu_put_be32(f, n->vqs[0].tx_waiting); qemu_put_be32(f, n->mergeable_rx_bufs); qemu_put_be16(f, n->status); qemu_put_byte(f, n->promisc); qemu_put_byte(f, n->allmulti); qemu_put_be32(f, n->mac_table.in_use); qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); qemu_put_be32(f, n->has_vnet_hdr); qemu_put_byte(f, n->mac_table.multi_overflow); qemu_put_byte(f, n->mac_table.uni_overflow); qemu_put_byte(f, n->alluni); qemu_put_byte(f, n->nomulti); qemu_put_byte(f, n->nouni); qemu_put_byte(f, n->nobcast); qemu_put_byte(f, n->has_ufo); if (n->max_queues > 1) { qemu_put_be16(f, n->max_queues); qemu_put_be16(f, n->curr_queues); for (i = 1; i < n->curr_queues; i++) { qemu_put_be32(f, n->vqs[i].tx_waiting); } } if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { qemu_put_be64(f, n->curr_guest_offloads); } } static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) { VirtIONet *n = opaque; VirtIODevice *vdev = VIRTIO_DEVICE(n); if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) return -EINVAL; return virtio_load(vdev, f, version_id); } static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f, int version_id) { VirtIONet *n = VIRTIO_NET(vdev); int i, link_down; qemu_get_buffer(f, n->mac, ETH_ALEN); n->vqs[0].tx_waiting = qemu_get_be32(f); virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f), virtio_has_feature(vdev, VIRTIO_F_VERSION_1)); if (version_id >= 3) n->status = qemu_get_be16(f); if (version_id >= 4) { if (version_id < 8) { n->promisc = qemu_get_be32(f); n->allmulti = qemu_get_be32(f); } else { n->promisc = qemu_get_byte(f); n->allmulti = qemu_get_byte(f); } } if (version_id >= 5) { n->mac_table.in_use = qemu_get_be32(f); /* MAC_TABLE_ENTRIES may be different from the saved image */ if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) { qemu_get_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); } else { int64_t i; /* Overflow detected - can happen if source has a larger MAC table. * We simply set overflow flag so there's no need to maintain the * table of addresses, discard them all. * Note: 64 bit math to avoid integer overflow. */ for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) { qemu_get_byte(f); } n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1; n->mac_table.in_use = 0; } } if (version_id >= 6) qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3); if (version_id >= 7) { if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) { error_report("virtio-net: saved image requires vnet_hdr=on"); return -1; } } if (version_id >= 9) { n->mac_table.multi_overflow = qemu_get_byte(f); n->mac_table.uni_overflow = qemu_get_byte(f); } if (version_id >= 10) { n->alluni = qemu_get_byte(f); n->nomulti = qemu_get_byte(f); n->nouni = qemu_get_byte(f); n->nobcast = qemu_get_byte(f); } if (version_id >= 11) { if (qemu_get_byte(f) && !peer_has_ufo(n)) { error_report("virtio-net: saved image requires TUN_F_UFO support"); return -1; } } if (n->max_queues > 1) { if (n->max_queues != qemu_get_be16(f)) { error_report("virtio-net: different max_queues "); return -1; } n->curr_queues = qemu_get_be16(f); if (n->curr_queues > n->max_queues) { error_report("virtio-net: curr_queues %x > max_queues %x", n->curr_queues, n->max_queues); return -1; } for (i = 1; i < n->curr_queues; i++) { n->vqs[i].tx_waiting = qemu_get_be32(f); } } if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { n->curr_guest_offloads = qemu_get_be64(f); } else { 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_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) && virtio_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; } static NetClientInfo net_virtio_info = { .type = NET_CLIENT_OPTIONS_KIND_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; virtio_net_set_config_size(n, n->host_features); virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); 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\""); } for (i = 0; i < n->max_queues; i++) { n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { n->vqs[i].tx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer); n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, &n->vqs[i]); } else { n->vqs[i].tx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh); n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); } n->vqs[i].tx_waiting = 0; n->vqs[i].n = n; } 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; register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, virtio_net_save, virtio_net_load, n); } static void virtio_net_device_unrealize(DeviceState *dev, Error **errp) { VirtIODevice *vdev = VIRTIO_DEVICE(dev); VirtIONet *n = VIRTIO_NET(dev); int i; /* This will stop vhost backend if appropriate. */ virtio_net_set_status(vdev, 0); unregister_savevm(dev, "virtio-net", n); 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); for (i = 0; i < n->max_queues; i++) { VirtIONetQueue *q = &n->vqs[i]; NetClientState *nc = qemu_get_subqueue(n->nic, i); qemu_purge_queued_packets(nc); if (q->tx_timer) { timer_del(q->tx_timer); timer_free(q->tx_timer); } else if (q->tx_bh) { qemu_bh_delete(q->tx_bh); } } 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 Property virtio_net_properties[] = { DEFINE_PROP_BIT("any_layout", VirtIONet, host_features, VIRTIO_F_ANY_LAYOUT, true), 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_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; 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->load = virtio_net_load_device; vdc->save = virtio_net_save_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)