--- /dev/null
+/*
+ * Virtio Network Device
+ *
+ * Copyright IBM, Corp. 2007
+ *
+ * Authors:
+ * Anthony Liguori <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/iov.h"
+#include "hw/virtio/virtio.h"
+#include "net/net.h"
+#include "net/checksum.h"
+#include "net/tap.h"
+#include "qemu/error-report.h"
+#include "qemu/timer.h"
+#include "hw/virtio/virtio-net.h"
+#include "net/vhost_net.h"
+#include "hw/virtio/virtio-bus.h"
+#include "qapi/qmp/qjson.h"
+#include "qapi-event.h"
+#include "hw/virtio/virtio-access.h"
+
+#define VIRTIO_NET_VM_VERSION 11
+
+#define MAC_TABLE_ENTRIES 64
+#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
+
+/*
+ * Calculate the number of bytes up to and including the given 'field' of
+ * 'container'.
+ */
+#define endof(container, field) \
+ (offsetof(container, field) + sizeof(((container *)0)->field))
+
+typedef struct VirtIOFeature {
+ uint32_t flags;
+ size_t end;
+} VirtIOFeature;
+
+static VirtIOFeature feature_sizes[] = {
+ {.flags = 1 << VIRTIO_NET_F_MAC,
+ .end = endof(struct virtio_net_config, mac)},
+ {.flags = 1 << VIRTIO_NET_F_STATUS,
+ .end = endof(struct virtio_net_config, status)},
+ {.flags = 1 << VIRTIO_NET_F_MQ,
+ .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
+ {}
+};
+
+static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+
+ return &n->vqs[nc->queue_index];
+}
+
+static int vq2q(int queue_index)
+{
+ return queue_index / 2;
+}
+
+/* TODO
+ * - we could suppress RX interrupt if we were so inclined.
+ */
+
+static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ struct virtio_net_config netcfg;
+
+ virtio_stw_p(vdev, &netcfg.status, n->status);
+ virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
+ memcpy(netcfg.mac, n->mac, ETH_ALEN);
+ memcpy(config, &netcfg, n->config_size);
+}
+
+static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ struct virtio_net_config netcfg = {};
+
+ memcpy(&netcfg, config, n->config_size);
+
+ if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
+ !virtio_has_feature(vdev, VIRTIO_F_VERSION_1) &&
+ memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
+ memcpy(n->mac, netcfg.mac, ETH_ALEN);
+ qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
+ }
+}
+
+static bool virtio_net_started(VirtIONet *n, uint8_t status)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+ (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
+}
+
+static void virtio_net_announce_timer(void *opaque)
+{
+ VirtIONet *n = opaque;
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+
+ n->announce_counter--;
+ n->status |= VIRTIO_NET_S_ANNOUNCE;
+ virtio_notify_config(vdev);
+}
+
+static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ NetClientState *nc = qemu_get_queue(n->nic);
+ int queues = n->multiqueue ? n->max_queues : 1;
+
+ if (!get_vhost_net(nc->peer)) {
+ return;
+ }
+
+ if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
+ !!n->vhost_started) {
+ return;
+ }
+ if (!n->vhost_started) {
+ int r, i;
+
+ /* Any packets outstanding? Purge them to avoid touching rings
+ * when vhost is running.
+ */
+ for (i = 0; i < queues; i++) {
+ NetClientState *qnc = qemu_get_subqueue(n->nic, i);
+
+ /* Purge both directions: TX and RX. */
+ qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
+ qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
+ }
+
+ n->vhost_started = 1;
+ r = vhost_net_start(vdev, n->nic->ncs, queues);
+ if (r < 0) {
+ error_report("unable to start vhost net: %d: "
+ "falling back on userspace virtio", -r);
+ n->vhost_started = 0;
+ }
+ } else {
+ vhost_net_stop(vdev, n->nic->ncs, queues);
+ n->vhost_started = 0;
+ }
+}
+
+static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ VirtIONetQueue *q;
+ int i;
+ uint8_t queue_status;
+
+ virtio_net_vhost_status(n, status);
+
+ for (i = 0; i < n->max_queues; i++) {
+ 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);
+ }
+ }
+ }
+}
+
+static void virtio_net_set_link_status(NetClientState *nc)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ uint16_t old_status = n->status;
+
+ if (nc->link_down)
+ n->status &= ~VIRTIO_NET_S_LINK_UP;
+ else
+ n->status |= VIRTIO_NET_S_LINK_UP;
+
+ if (n->status != old_status)
+ virtio_notify_config(vdev);
+
+ virtio_net_set_status(vdev, vdev->status);
+}
+
+static void rxfilter_notify(NetClientState *nc)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+
+ if (nc->rxfilter_notify_enabled) {
+ gchar *path = object_get_canonical_path(OBJECT(n->qdev));
+ qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
+ n->netclient_name, path, &error_abort);
+ g_free(path);
+
+ /* disable event notification to avoid events flooding */
+ nc->rxfilter_notify_enabled = 0;
+ }
+}
+
+static intList *get_vlan_table(VirtIONet *n)
+{
+ intList *list, *entry;
+ int i, j;
+
+ list = NULL;
+ for (i = 0; i < MAX_VLAN >> 5; i++) {
+ for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
+ if (n->vlans[i] & (1U << j)) {
+ entry = g_malloc0(sizeof(*entry));
+ entry->value = (i << 5) + j;
+ entry->next = list;
+ list = entry;
+ }
+ }
+ }
+
+ return list;
+}
+
+static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ RxFilterInfo *info;
+ strList *str_list, *entry;
+ int i;
+
+ info = g_malloc0(sizeof(*info));
+ info->name = g_strdup(nc->name);
+ info->promiscuous = n->promisc;
+
+ if (n->nouni) {
+ info->unicast = RX_STATE_NONE;
+ } else if (n->alluni) {
+ info->unicast = RX_STATE_ALL;
+ } else {
+ info->unicast = RX_STATE_NORMAL;
+ }
+
+ if (n->nomulti) {
+ info->multicast = RX_STATE_NONE;
+ } else if (n->allmulti) {
+ info->multicast = RX_STATE_ALL;
+ } else {
+ info->multicast = RX_STATE_NORMAL;
+ }
+
+ info->broadcast_allowed = n->nobcast;
+ info->multicast_overflow = n->mac_table.multi_overflow;
+ info->unicast_overflow = n->mac_table.uni_overflow;
+
+ info->main_mac = qemu_mac_strdup_printf(n->mac);
+
+ str_list = NULL;
+ for (i = 0; i < n->mac_table.first_multi; i++) {
+ entry = g_malloc0(sizeof(*entry));
+ entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
+ entry->next = str_list;
+ str_list = entry;
+ }
+ info->unicast_table = str_list;
+
+ str_list = NULL;
+ for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
+ entry = g_malloc0(sizeof(*entry));
+ entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
+ entry->next = str_list;
+ str_list = entry;
+ }
+ info->multicast_table = str_list;
+ info->vlan_table = get_vlan_table(n);
+
+ if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
+ info->vlan = RX_STATE_ALL;
+ } else if (!info->vlan_table) {
+ info->vlan = RX_STATE_NONE;
+ } else {
+ info->vlan = RX_STATE_NORMAL;
+ }
+
+ /* enable event notification after query */
+ nc->rxfilter_notify_enabled = 1;
+
+ return info;
+}
+
+static void virtio_net_reset(VirtIODevice *vdev)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+
+ /* Reset back to compatibility mode */
+ n->promisc = 1;
+ n->allmulti = 0;
+ n->alluni = 0;
+ n->nomulti = 0;
+ n->nouni = 0;
+ n->nobcast = 0;
+ /* multiqueue is disabled by default */
+ n->curr_queues = 1;
+ timer_del(n->announce_timer);
+ n->announce_counter = 0;
+ n->status &= ~VIRTIO_NET_S_ANNOUNCE;
+
+ /* Flush any MAC and VLAN filter table state */
+ n->mac_table.in_use = 0;
+ n->mac_table.first_multi = 0;
+ n->mac_table.multi_overflow = 0;
+ n->mac_table.uni_overflow = 0;
+ memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
+ memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
+ qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
+ memset(n->vlans, 0, MAX_VLAN >> 3);
+}
+
+static void peer_test_vnet_hdr(VirtIONet *n)
+{
+ NetClientState *nc = qemu_get_queue(n->nic);
+ if (!nc->peer) {
+ return;
+ }
+
+ n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
+}
+
+static int peer_has_vnet_hdr(VirtIONet *n)
+{
+ return n->has_vnet_hdr;
+}
+
+static int peer_has_ufo(VirtIONet *n)
+{
+ if (!peer_has_vnet_hdr(n))
+ return 0;
+
+ n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
+
+ return n->has_ufo;
+}
+
+static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
+ int version_1)
+{
+ int i;
+ NetClientState *nc;
+
+ n->mergeable_rx_bufs = mergeable_rx_bufs;
+
+ if (version_1) {
+ n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ } else {
+ n->guest_hdr_len = n->mergeable_rx_bufs ?
+ sizeof(struct virtio_net_hdr_mrg_rxbuf) :
+ sizeof(struct virtio_net_hdr);
+ }
+
+ for (i = 0; i < n->max_queues; i++) {
+ nc = qemu_get_subqueue(n->nic, i);
+
+ if (peer_has_vnet_hdr(n) &&
+ qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
+ qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
+ n->host_hdr_len = n->guest_hdr_len;
+ }
+ }
+}
+
+static int peer_attach(VirtIONet *n, int index)
+{
+ NetClientState *nc = qemu_get_subqueue(n->nic, index);
+
+ if (!nc->peer) {
+ return 0;
+ }
+
+ if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
+ return 0;
+ }
+
+ return tap_enable(nc->peer);
+}
+
+static int peer_detach(VirtIONet *n, int index)
+{
+ NetClientState *nc = qemu_get_subqueue(n->nic, index);
+
+ if (!nc->peer) {
+ return 0;
+ }
+
+ if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
+ return 0;
+ }
+
+ return tap_disable(nc->peer);
+}
+
+static void virtio_net_set_queues(VirtIONet *n)
+{
+ int i;
+ int r;
+
+ for (i = 0; i < n->max_queues; i++) {
+ if (i < n->curr_queues) {
+ r = peer_attach(n, i);
+ assert(!r);
+ } else {
+ r = peer_detach(n, i);
+ assert(!r);
+ }
+ }
+}
+
+static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
+
+static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
+ 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;
+ }
+ return vhost_net_get_features(get_vhost_net(nc->peer), features);
+}
+
+static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
+{
+ uint64_t features = 0;
+
+ /* Linux kernel 2.6.25. It understood MAC (as everyone must),
+ * but also these: */
+ virtio_add_feature(&features, VIRTIO_NET_F_MAC);
+ virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
+ virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
+ virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
+ virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
+
+ return features;
+}
+
+static void virtio_net_apply_guest_offloads(VirtIONet *n)
+{
+ qemu_set_offload(qemu_get_queue(n->nic)->peer,
+ !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
+ !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
+ !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
+ !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
+ !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
+}
+
+static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
+{
+ static const uint64_t guest_offloads_mask =
+ (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
+ (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
+ (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
+ (1ULL << VIRTIO_NET_F_GUEST_ECN) |
+ (1ULL << VIRTIO_NET_F_GUEST_UFO);
+
+ return guest_offloads_mask & features;
+}
+
+static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ return virtio_net_guest_offloads_by_features(vdev->guest_features);
+}
+
+static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ int i;
+
+ virtio_net_set_multiqueue(n,
+ __virtio_has_feature(features, VIRTIO_NET_F_MQ));
+
+ virtio_net_set_mrg_rx_bufs(n,
+ __virtio_has_feature(features,
+ VIRTIO_NET_F_MRG_RXBUF),
+ __virtio_has_feature(features,
+ VIRTIO_F_VERSION_1));
+
+ if (n->has_vnet_hdr) {
+ n->curr_guest_offloads =
+ virtio_net_guest_offloads_by_features(features);
+ virtio_net_apply_guest_offloads(n);
+ }
+
+ for (i = 0; i < n->max_queues; i++) {
+ NetClientState *nc = qemu_get_subqueue(n->nic, i);
+
+ if (!get_vhost_net(nc->peer)) {
+ continue;
+ }
+ vhost_net_ack_features(get_vhost_net(nc->peer), features);
+ }
+
+ if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
+ memset(n->vlans, 0, MAX_VLAN >> 3);
+ } else {
+ memset(n->vlans, 0xff, MAX_VLAN >> 3);
+ }
+}
+
+static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
+ struct iovec *iov, unsigned int iov_cnt)
+{
+ uint8_t on;
+ size_t s;
+ NetClientState *nc = qemu_get_queue(n->nic);
+
+ s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
+ if (s != sizeof(on)) {
+ return VIRTIO_NET_ERR;
+ }
+
+ if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
+ n->promisc = on;
+ } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
+ n->allmulti = on;
+ } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
+ n->alluni = on;
+ } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
+ n->nomulti = on;
+ } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
+ n->nouni = on;
+ } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
+ n->nobcast = on;
+ } else {
+ return VIRTIO_NET_ERR;
+ }
+
+ rxfilter_notify(nc);
+
+ return VIRTIO_NET_OK;
+}
+
+static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
+ struct iovec *iov, unsigned int iov_cnt)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ uint64_t offloads;
+ size_t s;
+
+ if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
+ return VIRTIO_NET_ERR;
+ }
+
+ s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
+ if (s != sizeof(offloads)) {
+ return VIRTIO_NET_ERR;
+ }
+
+ if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
+ uint64_t supported_offloads;
+
+ if (!n->has_vnet_hdr) {
+ return VIRTIO_NET_ERR;
+ }
+
+ supported_offloads = virtio_net_supported_guest_offloads(n);
+ if (offloads & ~supported_offloads) {
+ return VIRTIO_NET_ERR;
+ }
+
+ n->curr_guest_offloads = offloads;
+ virtio_net_apply_guest_offloads(n);
+
+ return VIRTIO_NET_OK;
+ } else {
+ return VIRTIO_NET_ERR;
+ }
+}
+
+static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
+ struct iovec *iov, unsigned int iov_cnt)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ struct virtio_net_ctrl_mac mac_data;
+ size_t s;
+ NetClientState *nc = qemu_get_queue(n->nic);
+
+ if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
+ if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
+ return VIRTIO_NET_ERR;
+ }
+ s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
+ assert(s == sizeof(n->mac));
+ qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
+ rxfilter_notify(nc);
+
+ return VIRTIO_NET_OK;
+ }
+
+ if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
+ return VIRTIO_NET_ERR;
+ }
+
+ int in_use = 0;
+ int first_multi = 0;
+ uint8_t uni_overflow = 0;
+ uint8_t multi_overflow = 0;
+ uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
+
+ s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
+ sizeof(mac_data.entries));
+ mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
+ if (s != sizeof(mac_data.entries)) {
+ goto error;
+ }
+ iov_discard_front(&iov, &iov_cnt, s);
+
+ if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
+ goto error;
+ }
+
+ if (mac_data.entries <= MAC_TABLE_ENTRIES) {
+ s = iov_to_buf(iov, iov_cnt, 0, macs,
+ mac_data.entries * ETH_ALEN);
+ if (s != mac_data.entries * ETH_ALEN) {
+ goto error;
+ }
+ in_use += mac_data.entries;
+ } else {
+ uni_overflow = 1;
+ }
+
+ iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
+
+ first_multi = in_use;
+
+ s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
+ sizeof(mac_data.entries));
+ mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
+ if (s != sizeof(mac_data.entries)) {
+ goto error;
+ }
+
+ iov_discard_front(&iov, &iov_cnt, s);
+
+ if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
+ goto error;
+ }
+
+ if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
+ s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
+ mac_data.entries * ETH_ALEN);
+ if (s != mac_data.entries * ETH_ALEN) {
+ goto error;
+ }
+ in_use += mac_data.entries;
+ } else {
+ multi_overflow = 1;
+ }
+
+ n->mac_table.in_use = in_use;
+ n->mac_table.first_multi = first_multi;
+ n->mac_table.uni_overflow = uni_overflow;
+ n->mac_table.multi_overflow = multi_overflow;
+ memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
+ g_free(macs);
+ rxfilter_notify(nc);
+
+ return VIRTIO_NET_OK;
+
+error:
+ g_free(macs);
+ return VIRTIO_NET_ERR;
+}
+
+static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
+ struct iovec *iov, unsigned int iov_cnt)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ uint16_t vid;
+ size_t s;
+ NetClientState *nc = qemu_get_queue(n->nic);
+
+ s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
+ vid = virtio_lduw_p(vdev, &vid);
+ if (s != sizeof(vid)) {
+ return VIRTIO_NET_ERR;
+ }
+
+ if (vid >= MAX_VLAN)
+ return VIRTIO_NET_ERR;
+
+ if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
+ n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
+ else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
+ n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
+ else
+ return VIRTIO_NET_ERR;
+
+ rxfilter_notify(nc);
+
+ return VIRTIO_NET_OK;
+}
+
+static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
+ struct iovec *iov, unsigned int iov_cnt)
+{
+ if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
+ n->status & VIRTIO_NET_S_ANNOUNCE) {
+ n->status &= ~VIRTIO_NET_S_ANNOUNCE;
+ if (n->announce_counter) {
+ timer_mod(n->announce_timer,
+ qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+ self_announce_delay(n->announce_counter));
+ }
+ return VIRTIO_NET_OK;
+ } else {
+ return VIRTIO_NET_ERR;
+ }
+}
+
+static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
+ struct iovec *iov, unsigned int iov_cnt)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ struct virtio_net_ctrl_mq mq;
+ size_t s;
+ uint16_t queues;
+
+ s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
+ if (s != sizeof(mq)) {
+ return VIRTIO_NET_ERR;
+ }
+
+ if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
+ return VIRTIO_NET_ERR;
+ }
+
+ queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
+
+ if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
+ queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
+ queues > n->max_queues ||
+ !n->multiqueue) {
+ return VIRTIO_NET_ERR;
+ }
+
+ n->curr_queues = queues;
+ /* stop the backend before changing the number of queues to avoid handling a
+ * disabled queue */
+ virtio_net_set_status(vdev, vdev->status);
+ virtio_net_set_queues(n);
+
+ return VIRTIO_NET_OK;
+}
+static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ struct virtio_net_ctrl_hdr ctrl;
+ virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
+ VirtQueueElement elem;
+ size_t s;
+ struct iovec *iov, *iov2;
+ unsigned int iov_cnt;
+
+ while (virtqueue_pop(vq, &elem)) {
+ if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) ||
+ iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
+ error_report("virtio-net ctrl missing headers");
+ exit(1);
+ }
+
+ iov_cnt = elem.out_num;
+ iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num);
+ s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
+ iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
+ if (s != sizeof(ctrl)) {
+ status = VIRTIO_NET_ERR;
+ } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
+ status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
+ status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
+ status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
+ status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
+ status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
+ } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
+ status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
+ }
+
+ s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
+ assert(s == sizeof(status));
+
+ virtqueue_push(vq, &elem, sizeof(status));
+ virtio_notify(vdev, vq);
+ g_free(iov2);
+ }
+}
+
+/* RX */
+
+static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ int queue_index = vq2q(virtio_get_queue_index(vq));
+
+ qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
+}
+
+static int virtio_net_can_receive(NetClientState *nc)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ VirtIONetQueue *q = virtio_net_get_subqueue(nc);
+
+ if (!vdev->vm_running) {
+ return 0;
+ }
+
+ if (nc->queue_index >= n->curr_queues) {
+ return 0;
+ }
+
+ if (!virtio_queue_ready(q->rx_vq) ||
+ !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return 0;
+ }
+
+ return 1;
+}
+
+static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
+{
+ VirtIONet *n = q->n;
+ if (virtio_queue_empty(q->rx_vq) ||
+ (n->mergeable_rx_bufs &&
+ !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
+ virtio_queue_set_notification(q->rx_vq, 1);
+
+ /* To avoid a race condition where the guest has made some buffers
+ * available after the above check but before notification was
+ * enabled, check for available buffers again.
+ */
+ if (virtio_queue_empty(q->rx_vq) ||
+ (n->mergeable_rx_bufs &&
+ !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
+ return 0;
+ }
+ }
+
+ virtio_queue_set_notification(q->rx_vq, 0);
+ return 1;
+}
+
+static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
+{
+ virtio_tswap16s(vdev, &hdr->hdr_len);
+ virtio_tswap16s(vdev, &hdr->gso_size);
+ virtio_tswap16s(vdev, &hdr->csum_start);
+ virtio_tswap16s(vdev, &hdr->csum_offset);
+}
+
+/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
+ * it never finds out that the packets don't have valid checksums. This
+ * causes dhclient to get upset. Fedora's carried a patch for ages to
+ * fix this with Xen but it hasn't appeared in an upstream release of
+ * dhclient yet.
+ *
+ * To avoid breaking existing guests, we catch udp packets and add
+ * checksums. This is terrible but it's better than hacking the guest
+ * kernels.
+ *
+ * N.B. if we introduce a zero-copy API, this operation is no longer free so
+ * we should provide a mechanism to disable it to avoid polluting the host
+ * cache.
+ */
+static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
+ uint8_t *buf, size_t size)
+{
+ if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
+ (size > 27 && size < 1500) && /* normal sized MTU */
+ (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
+ (buf[23] == 17) && /* ip.protocol == UDP */
+ (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
+ net_checksum_calculate(buf, size);
+ hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ }
+}
+
+static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
+ const void *buf, size_t size)
+{
+ if (n->has_vnet_hdr) {
+ /* FIXME this cast is evil */
+ void *wbuf = (void *)buf;
+ work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
+ size - n->host_hdr_len);
+ virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
+ iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
+ } else {
+ struct virtio_net_hdr hdr = {
+ .flags = 0,
+ .gso_type = VIRTIO_NET_HDR_GSO_NONE
+ };
+ iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
+ }
+}
+
+static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
+{
+ static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+ static const uint8_t vlan[] = {0x81, 0x00};
+ uint8_t *ptr = (uint8_t *)buf;
+ int i;
+
+ if (n->promisc)
+ return 1;
+
+ ptr += n->host_hdr_len;
+
+ if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
+ int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
+ if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
+ return 0;
+ }
+
+ if (ptr[0] & 1) { // multicast
+ if (!memcmp(ptr, bcast, sizeof(bcast))) {
+ return !n->nobcast;
+ } else if (n->nomulti) {
+ return 0;
+ } else if (n->allmulti || n->mac_table.multi_overflow) {
+ return 1;
+ }
+
+ for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
+ if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
+ return 1;
+ }
+ }
+ } else { // unicast
+ if (n->nouni) {
+ return 0;
+ } else if (n->alluni || n->mac_table.uni_overflow) {
+ return 1;
+ } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
+ return 1;
+ }
+
+ for (i = 0; i < n->mac_table.first_multi; i++) {
+ if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIONetQueue *q = virtio_net_get_subqueue(nc);
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
+ struct virtio_net_hdr_mrg_rxbuf mhdr;
+ unsigned mhdr_cnt = 0;
+ size_t offset, i, guest_offset;
+
+ if (!virtio_net_can_receive(nc)) {
+ return -1;
+ }
+
+ /* hdr_len refers to the header we supply to the guest */
+ if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
+ return 0;
+ }
+
+ if (!receive_filter(n, buf, size))
+ return size;
+
+ offset = i = 0;
+
+ while (offset < size) {
+ VirtQueueElement elem;
+ int len, total;
+ const struct iovec *sg = elem.in_sg;
+
+ total = 0;
+
+ if (virtqueue_pop(q->rx_vq, &elem) == 0) {
+ if (i == 0)
+ return -1;
+ error_report("virtio-net unexpected empty queue: "
+ "i %zd mergeable %d offset %zd, size %zd, "
+ "guest hdr len %zd, host hdr len %zd "
+ "guest features 0x%" PRIx64,
+ i, n->mergeable_rx_bufs, offset, size,
+ n->guest_hdr_len, n->host_hdr_len,
+ vdev->guest_features);
+ exit(1);
+ }
+
+ if (elem.in_num < 1) {
+ error_report("virtio-net receive queue contains no in buffers");
+ exit(1);
+ }
+
+ if (i == 0) {
+ assert(offset == 0);
+ if (n->mergeable_rx_bufs) {
+ mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
+ sg, elem.in_num,
+ offsetof(typeof(mhdr), num_buffers),
+ sizeof(mhdr.num_buffers));
+ }
+
+ receive_header(n, sg, elem.in_num, buf, size);
+ offset = n->host_hdr_len;
+ total += n->guest_hdr_len;
+ guest_offset = n->guest_hdr_len;
+ } else {
+ guest_offset = 0;
+ }
+
+ /* copy in packet. ugh */
+ len = iov_from_buf(sg, elem.in_num, guest_offset,
+ buf + offset, size - offset);
+ total += len;
+ offset += len;
+ /* If buffers can't be merged, at this point we
+ * must have consumed the complete packet.
+ * Otherwise, drop it. */
+ if (!n->mergeable_rx_bufs && offset < size) {
+#if 0
+ error_report("virtio-net truncated non-mergeable packet: "
+ "i %zd mergeable %d offset %zd, size %zd, "
+ "guest hdr len %zd, host hdr len %zd",
+ i, n->mergeable_rx_bufs,
+ offset, size, n->guest_hdr_len, n->host_hdr_len);
+#endif
+ return size;
+ }
+
+ /* signal other side */
+ virtqueue_fill(q->rx_vq, &elem, total, i++);
+ }
+
+ if (mhdr_cnt) {
+ virtio_stw_p(vdev, &mhdr.num_buffers, i);
+ iov_from_buf(mhdr_sg, mhdr_cnt,
+ 0,
+ &mhdr.num_buffers, sizeof mhdr.num_buffers);
+ }
+
+ virtqueue_flush(q->rx_vq, i);
+ virtio_notify(vdev, q->rx_vq);
+
+ return size;
+}
+
+static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
+
+static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIONetQueue *q = virtio_net_get_subqueue(nc);
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+
+ virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
+ virtio_notify(vdev, q->tx_vq);
+
+ q->async_tx.elem.out_num = q->async_tx.len = 0;
+
+ virtio_queue_set_notification(q->tx_vq, 1);
+ virtio_net_flush_tx(q);
+}
+
+/* TX */
+static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
+{
+ VirtIONet *n = q->n;
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ VirtQueueElement elem;
+ int32_t num_packets = 0;
+ int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
+ if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return num_packets;
+ }
+
+ if (q->async_tx.elem.out_num) {
+ virtio_queue_set_notification(q->tx_vq, 0);
+ return num_packets;
+ }
+
+ while (virtqueue_pop(q->tx_vq, &elem)) {
+ ssize_t ret, len;
+ unsigned int out_num = elem.out_num;
+ struct iovec *out_sg = &elem.out_sg[0];
+ struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1];
+ struct virtio_net_hdr_mrg_rxbuf mhdr;
+
+ if (out_num < 1) {
+ error_report("virtio-net header not in first element");
+ exit(1);
+ }
+
+ if (n->has_vnet_hdr) {
+ if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
+ n->guest_hdr_len) {
+ error_report("virtio-net header incorrect");
+ exit(1);
+ }
+ if (virtio_needs_swap(vdev)) {
+ 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;
+ }
+
+ 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;
+drop:
+ virtqueue_push(q->tx_vq, &elem, 0);
+ virtio_notify(vdev, q->tx_vq);
+
+ if (++num_packets >= n->tx_burst) {
+ break;
+ }
+ }
+ return num_packets;
+}
+
+static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
+
+ /* This happens when device was stopped but VCPU wasn't. */
+ if (!vdev->vm_running) {
+ q->tx_waiting = 1;
+ return;
+ }
+
+ if (q->tx_waiting) {
+ virtio_queue_set_notification(vq, 1);
+ timer_del(q->tx_timer);
+ q->tx_waiting = 0;
+ virtio_net_flush_tx(q);
+ } else {
+ timer_mod(q->tx_timer,
+ qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
+ q->tx_waiting = 1;
+ virtio_queue_set_notification(vq, 0);
+ }
+}
+
+static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
+
+ if (unlikely(q->tx_waiting)) {
+ return;
+ }
+ q->tx_waiting = 1;
+ /* This happens when device was stopped but VCPU wasn't. */
+ if (!vdev->vm_running) {
+ return;
+ }
+ virtio_queue_set_notification(vq, 0);
+ qemu_bh_schedule(q->tx_bh);
+}
+
+static void virtio_net_tx_timer(void *opaque)
+{
+ VirtIONetQueue *q = opaque;
+ VirtIONet *n = q->n;
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ /* This happens when device was stopped but BH wasn't. */
+ if (!vdev->vm_running) {
+ /* Make sure tx waiting is set, so we'll run when restarted. */
+ assert(q->tx_waiting);
+ return;
+ }
+
+ q->tx_waiting = 0;
+
+ /* Just in case the driver is not ready on more */
+ if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+ return;
+ }
+
+ virtio_queue_set_notification(q->tx_vq, 1);
+ virtio_net_flush_tx(q);
+}
+
+static void virtio_net_tx_bh(void *opaque)
+{
+ VirtIONetQueue *q = opaque;
+ VirtIONet *n = q->n;
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+ int32_t ret;
+
+ /* This happens when device was stopped but BH wasn't. */
+ if (!vdev->vm_running) {
+ /* Make sure tx waiting is set, so we'll run when restarted. */
+ assert(q->tx_waiting);
+ return;
+ }
+
+ q->tx_waiting = 0;
+
+ /* Just in case the driver is not ready on more */
+ if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
+ return;
+ }
+
+ ret = virtio_net_flush_tx(q);
+ if (ret == -EBUSY) {
+ return; /* Notification re-enable handled by tx_complete */
+ }
+
+ /* If we flush a full burst of packets, assume there are
+ * more coming and immediately reschedule */
+ if (ret >= n->tx_burst) {
+ qemu_bh_schedule(q->tx_bh);
+ q->tx_waiting = 1;
+ return;
+ }
+
+ /* If less than a full burst, re-enable notification and flush
+ * anything that may have come in while we weren't looking. If
+ * we find something, assume the guest is still active and reschedule */
+ virtio_queue_set_notification(q->tx_vq, 1);
+ if (virtio_net_flush_tx(q) > 0) {
+ virtio_queue_set_notification(q->tx_vq, 0);
+ qemu_bh_schedule(q->tx_bh);
+ q->tx_waiting = 1;
+ }
+}
+
+static void virtio_net_add_queue(VirtIONet *n, int index)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+
+ n->vqs[index].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
+ if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
+ n->vqs[index].tx_vq =
+ virtio_add_queue(vdev, 256, 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, 256, 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);
+ } else {
+ qemu_bh_delete(q->tx_bh);
+ }
+ 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 void virtio_net_save(QEMUFile *f, void *opaque)
+{
+ VirtIONet *n = opaque;
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+
+ /* At this point, backend must be stopped, otherwise
+ * it might keep writing to memory. */
+ assert(!n->vhost_started);
+ virtio_save(vdev, f);
+}
+
+static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ int i;
+
+ qemu_put_buffer(f, n->mac, ETH_ALEN);
+ qemu_put_be32(f, n->vqs[0].tx_waiting);
+ qemu_put_be32(f, n->mergeable_rx_bufs);
+ qemu_put_be16(f, n->status);
+ qemu_put_byte(f, n->promisc);
+ qemu_put_byte(f, n->allmulti);
+ qemu_put_be32(f, n->mac_table.in_use);
+ qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
+ qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
+ qemu_put_be32(f, n->has_vnet_hdr);
+ qemu_put_byte(f, n->mac_table.multi_overflow);
+ qemu_put_byte(f, n->mac_table.uni_overflow);
+ qemu_put_byte(f, n->alluni);
+ qemu_put_byte(f, n->nomulti);
+ qemu_put_byte(f, n->nouni);
+ qemu_put_byte(f, n->nobcast);
+ qemu_put_byte(f, n->has_ufo);
+ if (n->max_queues > 1) {
+ qemu_put_be16(f, n->max_queues);
+ qemu_put_be16(f, n->curr_queues);
+ for (i = 1; i < n->curr_queues; i++) {
+ qemu_put_be32(f, n->vqs[i].tx_waiting);
+ }
+ }
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
+ qemu_put_be64(f, n->curr_guest_offloads);
+ }
+}
+
+static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
+{
+ VirtIONet *n = opaque;
+ VirtIODevice *vdev = VIRTIO_DEVICE(n);
+
+ if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
+ return -EINVAL;
+
+ return virtio_load(vdev, f, version_id);
+}
+
+static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
+ int version_id)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ int i, link_down;
+
+ qemu_get_buffer(f, n->mac, ETH_ALEN);
+ n->vqs[0].tx_waiting = qemu_get_be32(f);
+
+ virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f),
+ virtio_has_feature(vdev, VIRTIO_F_VERSION_1));
+
+ if (version_id >= 3)
+ n->status = qemu_get_be16(f);
+
+ if (version_id >= 4) {
+ if (version_id < 8) {
+ n->promisc = qemu_get_be32(f);
+ n->allmulti = qemu_get_be32(f);
+ } else {
+ n->promisc = qemu_get_byte(f);
+ n->allmulti = qemu_get_byte(f);
+ }
+ }
+
+ if (version_id >= 5) {
+ n->mac_table.in_use = qemu_get_be32(f);
+ /* MAC_TABLE_ENTRIES may be different from the saved image */
+ if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
+ qemu_get_buffer(f, n->mac_table.macs,
+ n->mac_table.in_use * ETH_ALEN);
+ } else {
+ int64_t i;
+
+ /* Overflow detected - can happen if source has a larger MAC table.
+ * We simply set overflow flag so there's no need to maintain the
+ * table of addresses, discard them all.
+ * Note: 64 bit math to avoid integer overflow.
+ */
+ for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
+ qemu_get_byte(f);
+ }
+ n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
+ n->mac_table.in_use = 0;
+ }
+ }
+
+ if (version_id >= 6)
+ qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
+
+ if (version_id >= 7) {
+ if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
+ error_report("virtio-net: saved image requires vnet_hdr=on");
+ return -1;
+ }
+ }
+
+ if (version_id >= 9) {
+ n->mac_table.multi_overflow = qemu_get_byte(f);
+ n->mac_table.uni_overflow = qemu_get_byte(f);
+ }
+
+ if (version_id >= 10) {
+ n->alluni = qemu_get_byte(f);
+ n->nomulti = qemu_get_byte(f);
+ n->nouni = qemu_get_byte(f);
+ n->nobcast = qemu_get_byte(f);
+ }
+
+ if (version_id >= 11) {
+ if (qemu_get_byte(f) && !peer_has_ufo(n)) {
+ error_report("virtio-net: saved image requires TUN_F_UFO support");
+ return -1;
+ }
+ }
+
+ if (n->max_queues > 1) {
+ if (n->max_queues != qemu_get_be16(f)) {
+ error_report("virtio-net: different max_queues ");
+ return -1;
+ }
+
+ n->curr_queues = qemu_get_be16(f);
+ if (n->curr_queues > n->max_queues) {
+ error_report("virtio-net: curr_queues %x > max_queues %x",
+ n->curr_queues, n->max_queues);
+ return -1;
+ }
+ for (i = 1; i < n->curr_queues; i++) {
+ n->vqs[i].tx_waiting = qemu_get_be32(f);
+ }
+ }
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
+ n->curr_guest_offloads = qemu_get_be64(f);
+ } else {
+ n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
+ }
+
+ if (peer_has_vnet_hdr(n)) {
+ virtio_net_apply_guest_offloads(n);
+ }
+
+ virtio_net_set_queues(n);
+
+ /* Find the first multicast entry in the saved MAC filter */
+ for (i = 0; i < n->mac_table.in_use; i++) {
+ if (n->mac_table.macs[i * ETH_ALEN] & 1) {
+ break;
+ }
+ }
+ n->mac_table.first_multi = i;
+
+ /* nc.link_down can't be migrated, so infer link_down according
+ * to link status bit in n->status */
+ link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
+ for (i = 0; i < n->max_queues; i++) {
+ qemu_get_subqueue(n->nic, i)->link_down = link_down;
+ }
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
+ virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
+ n->announce_counter = SELF_ANNOUNCE_ROUNDS;
+ timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
+ }
+
+ return 0;
+}
+
+static NetClientInfo net_virtio_info = {
+ .type = NET_CLIENT_OPTIONS_KIND_NIC,
+ .size = sizeof(NICState),
+ .can_receive = virtio_net_can_receive,
+ .receive = virtio_net_receive,
+ .link_status_changed = virtio_net_set_link_status,
+ .query_rx_filter = virtio_net_query_rxfilter,
+};
+
+static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
+ assert(n->vhost_started);
+ return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
+}
+
+static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
+ bool mask)
+{
+ VirtIONet *n = VIRTIO_NET(vdev);
+ NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
+ assert(n->vhost_started);
+ vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
+ vdev, idx, mask);
+}
+
+static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
+{
+ int i, config_size = 0;
+ virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
+ for (i = 0; feature_sizes[i].flags != 0; i++) {
+ if (host_features & feature_sizes[i].flags) {
+ config_size = MAX(feature_sizes[i].end, config_size);
+ }
+ }
+ n->config_size = config_size;
+}
+
+void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
+ const char *type)
+{
+ /*
+ * The name can be NULL, the netclient name will be type.x.
+ */
+ assert(type != NULL);
+
+ g_free(n->netclient_name);
+ g_free(n->netclient_type);
+ n->netclient_name = g_strdup(name);
+ n->netclient_type = g_strdup(type);
+}
+
+static void virtio_net_device_realize(DeviceState *dev, Error **errp)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ VirtIONet *n = VIRTIO_NET(dev);
+ NetClientState *nc;
+ int i;
+
+ virtio_net_set_config_size(n, n->host_features);
+ virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
+
+ n->max_queues = MAX(n->nic_conf.peers.queues, 1);
+ if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
+ error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
+ "must be a positive integer less than %d.",
+ n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
+ virtio_cleanup(vdev);
+ return;
+ }
+ n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
+ n->curr_queues = 1;
+ n->tx_timeout = n->net_conf.txtimer;
+
+ if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
+ && strcmp(n->net_conf.tx, "bh")) {
+ error_report("virtio-net: "
+ "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
+ n->net_conf.tx);
+ error_report("Defaulting to \"bh\"");
+ }
+
+ for (i = 0; i < n->max_queues; i++) {
+ 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;
+ register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
+ virtio_net_save, virtio_net_load, n);
+}
+
+static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
+{
+ VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ VirtIONet *n = VIRTIO_NET(dev);
+ int i, max_queues;
+
+ /* This will stop vhost backend if appropriate. */
+ virtio_net_set_status(vdev, 0);
+
+ unregister_savevm(dev, "virtio-net", n);
+
+ g_free(n->netclient_name);
+ n->netclient_name = NULL;
+ g_free(n->netclient_type);
+ n->netclient_type = NULL;
+
+ g_free(n->mac_table.macs);
+ g_free(n->vlans);
+
+ 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 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_END_OF_LIST(),
+};
+
+static void virtio_net_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+
+ dc->props = virtio_net_properties;
+ set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
+ vdc->realize = virtio_net_device_realize;
+ vdc->unrealize = virtio_net_device_unrealize;
+ vdc->get_config = virtio_net_get_config;
+ vdc->set_config = virtio_net_set_config;
+ vdc->get_features = virtio_net_get_features;
+ vdc->set_features = virtio_net_set_features;
+ vdc->bad_features = virtio_net_bad_features;
+ vdc->reset = virtio_net_reset;
+ vdc->set_status = virtio_net_set_status;
+ vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
+ vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
+ vdc->load = virtio_net_load_device;
+ vdc->save = virtio_net_save_device;
+}
+
+static const TypeInfo virtio_net_info = {
+ .name = TYPE_VIRTIO_NET,
+ .parent = TYPE_VIRTIO_DEVICE,
+ .instance_size = sizeof(VirtIONet),
+ .instance_init = virtio_net_instance_init,
+ .class_init = virtio_net_class_init,
+};
+
+static void virtio_register_types(void)
+{
+ type_register_static(&virtio_net_info);
+}
+
+type_init(virtio_register_types)
Code Review / kvmfornfv.git / blobdiff