| /* |
| * 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 "monitor/monitor.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; |
| |
| stw_p(&netcfg.status, n->status); |
| stw_p(&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 (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 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_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 (!nc->peer) { |
| return; |
| } |
| if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { |
| return; |
| } |
| |
| if (!tap_get_vhost_net(nc->peer)) { |
| return; |
| } |
| |
| if (!!n->vhost_started == |
| (virtio_net_started(n, status) && !nc->peer->link_down)) { |
| return; |
| } |
| if (!n->vhost_started) { |
| int r; |
| if (!vhost_net_query(tap_get_vhost_net(nc->peer), vdev)) { |
| 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 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) |
| { |
| QObject *event_data; |
| VirtIONet *n = qemu_get_nic_opaque(nc); |
| |
| if (nc->rxfilter_notify_enabled) { |
| gchar *path = object_get_canonical_path(OBJECT(n->qdev)); |
| if (n->netclient_name) { |
| event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }", |
| n->netclient_name, path); |
| } else { |
| event_data = qobject_from_jsonf("{ 'path': %s }", path); |
| } |
| monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data); |
| qobject_decref(event_data); |
| g_free(path); |
| |
| /* disable event notification to avoid events flooding */ |
| nc->rxfilter_notify_enabled = 0; |
| } |
| } |
| |
| static char *mac_strdup_printf(const uint8_t *mac) |
| { |
| return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0], |
| mac[1], mac[2], mac[3], mac[4], mac[5]); |
| } |
| |
| 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 = 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 = 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 = 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 (!((1 << VIRTIO_NET_F_CTRL_VLAN) & vdev->guest_features)) { |
| 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; |
| |
| /* 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 i; |
| NetClientState *nc; |
| |
| n->mergeable_rx_bufs = mergeable_rx_bufs; |
| |
| 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 uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features) |
| { |
| VirtIONet *n = VIRTIO_NET(vdev); |
| NetClientState *nc = qemu_get_queue(n->nic); |
| |
| features |= (1 << VIRTIO_NET_F_MAC); |
| |
| if (!peer_has_vnet_hdr(n)) { |
| features &= ~(0x1 << VIRTIO_NET_F_CSUM); |
| features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4); |
| features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6); |
| features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN); |
| |
| features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM); |
| features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4); |
| features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6); |
| features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN); |
| } |
| |
| if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) { |
| features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO); |
| features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO); |
| } |
| |
| if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { |
| return features; |
| } |
| if (!tap_get_vhost_net(nc->peer)) { |
| return features; |
| } |
| return vhost_net_get_features(tap_get_vhost_net(nc->peer), features); |
| } |
| |
| static uint32_t virtio_net_bad_features(VirtIODevice *vdev) |
| { |
| uint32_t features = 0; |
| |
| /* Linux kernel 2.6.25. It understood MAC (as everyone must), |
| * but also these: */ |
| features |= (1 << VIRTIO_NET_F_MAC); |
| features |= (1 << VIRTIO_NET_F_CSUM); |
| features |= (1 << VIRTIO_NET_F_HOST_TSO4); |
| features |= (1 << VIRTIO_NET_F_HOST_TSO6); |
| features |= (1 << 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, uint32_t features) |
| { |
| VirtIONet *n = VIRTIO_NET(vdev); |
| int i; |
| |
| virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ))); |
| |
| virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF))); |
| |
| 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 (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) { |
| continue; |
| } |
| if (!tap_get_vhost_net(nc->peer)) { |
| continue; |
| } |
| vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); |
| } |
| |
| if ((1 << VIRTIO_NET_F_CTRL_VLAN) & features) { |
| 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 (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) { |
| 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) |
| { |
| 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 = ldl_p(&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 = ldl_p(&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) |
| { |
| 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 = lduw_p(&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_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 = lduw_p(&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; |
| 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 = elem.out_sg; |
| iov_cnt = 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_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); |
| } |
| } |
| |
| /* 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; |
| } |
| |
| /* 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); |
| 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%x", |
| 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) { |
| stw_p(&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; |
| } |
| |
| assert(vdev->vm_running); |
| |
| 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 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); |
| assert(vdev->vm_running); |
| |
| 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; |
| |
| assert(vdev->vm_running); |
| |
| 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) |
| { |
| VirtIODevice *vdev = VIRTIO_DEVICE(n); |
| int i, max = multiqueue ? n->max_queues : 1; |
| |
| n->multiqueue = multiqueue; |
| |
| for (i = 2; i <= n->max_queues * 2 + 1; i++) { |
| virtio_del_queue(vdev, i); |
| } |
| |
| for (i = 1; i < max; i++) { |
| n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); |
| if (n->vqs[i].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; |
| } |
| |
| /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack |
| * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid |
| * breaking them. |
| */ |
| n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl); |
| |
| virtio_net_set_queues(n); |
| } |
| |
| static void virtio_net_save(QEMUFile *f, void *opaque) |
| { |
| int i; |
| 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); |
| |
| 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 ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { |
| 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); |
| int ret, i, link_down; |
| |
| if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
| return -EINVAL; |
| |
| ret = virtio_load(vdev, f); |
| if (ret) { |
| return ret; |
| } |
| |
| 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)); |
| |
| 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 if (n->mac_table.in_use) { |
| uint8_t *buf = g_malloc0(n->mac_table.in_use); |
| qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); |
| g_free(buf); |
| 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); |
| for (i = 1; i < n->curr_queues; i++) { |
| n->vqs[i].tx_waiting = qemu_get_be32(f); |
| } |
| } |
| |
| if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) { |
| 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; |
| } |
| |
| return 0; |
| } |
| |
| static void virtio_net_cleanup(NetClientState *nc) |
| { |
| VirtIONet *n = qemu_get_nic_opaque(nc); |
| |
| n->nic = NULL; |
| } |
| |
| static NetClientInfo net_virtio_info = { |
| .type = NET_CLIENT_OPTIONS_KIND_NIC, |
| .size = sizeof(NICState), |
| .can_receive = virtio_net_can_receive, |
| .receive = virtio_net_receive, |
| .cleanup = virtio_net_cleanup, |
| .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(tap_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(tap_get_vhost_net(nc->peer), |
| vdev, idx, mask); |
| } |
| |
| void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features) |
| { |
| int i, config_size = 0; |
| host_features |= (1 << 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); |
| |
| if (n->netclient_name) { |
| g_free(n->netclient_name); |
| n->netclient_name = NULL; |
| } |
| if (n->netclient_type) { |
| g_free(n->netclient_type); |
| n->netclient_type = NULL; |
| } |
| |
| if (name != NULL) { |
| 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_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size); |
| |
| n->max_queues = MAX(n->nic_conf.queues, 1); |
| n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues); |
| n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx); |
| n->curr_queues = 1; |
| n->vqs[0].n = n; |
| 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\""); |
| } |
| |
| if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) { |
| n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, |
| virtio_net_handle_tx_timer); |
| n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer, |
| &n->vqs[0]); |
| } else { |
| n->vqs[0].tx_vq = virtio_add_queue(vdev, 256, |
| virtio_net_handle_tx_bh); |
| n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); |
| } |
| 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; |
| |
| 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); |
| 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); |
| |
| add_boot_device_path(n->nic_conf.bootindex, dev, "/ethernet-phy@0"); |
| } |
| |
| 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); |
| |
| if (n->netclient_name) { |
| g_free(n->netclient_name); |
| n->netclient_name = NULL; |
| } |
| if (n->netclient_type) { |
| 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); |
| } |
| } |
| |
| 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); |
| } |
| |
| static Property virtio_net_properties[] = { |
| 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; |
| } |
| |
| 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) |