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