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qemu/hw/net/virtio-net.c
Markus Armbruster b69c3c21a5 qdev: Unrealize must not fail 
Devices may have component devices and buses.

Device realization may fail.  Realization is recursive: a device's
realize() method realizes its components, and device_set_realized()
realizes its buses (which should in turn realize the devices on that
bus, except bus_set_realized() doesn't implement that, yet).

When realization of a component or bus fails, we need to roll back:
unrealize everything we realized so far.  If any of these unrealizes
failed, the device would be left in an inconsistent state.  Must not
happen.

device_set_realized() lets it happen: it ignores errors in the roll
back code starting at label child_realize_fail.

Since realization is recursive, unrealization must be recursive, too.
But how could a partly failed unrealize be rolled back?  We'd have to
re-realize, which can fail.  This design is fundamentally broken.

device_set_realized() does not roll back at all.  Instead, it keeps
unrealizing, ignoring further errors.

It can screw up even for a device with no buses: if the lone
dc->unrealize() fails, it still unregisters vmstate, and calls
listeners' unrealize() callback.

bus_set_realized() does not roll back either.  Instead, it stops
unrealizing.

Fortunately, no unrealize method can fail, as we'll see below.

To fix the design error, drop parameter @errp from all the unrealize
methods.

Any unrealize method that uses @errp now needs an update.  This leads
us to unrealize() methods that can fail.  Merely passing it to another
unrealize method cannot cause failure, though.  Here are the ones that
do other things with @errp:

* virtio_serial_device_unrealize()

  Fails when qbus_set_hotplug_handler() fails, but still does all the
  other work.  On failure, the device would stay realized with its
  resources completely gone.  Oops.  Can't happen, because
  qbus_set_hotplug_handler() can't actually fail here.  Pass
  &error_abort to qbus_set_hotplug_handler() instead.

* hw/ppc/spapr_drc.c's unrealize()

  Fails when object_property_del() fails, but all the other work is
  already done.  On failure, the device would stay realized with its
  vmstate registration gone.  Oops.  Can't happen, because
  object_property_del() can't actually fail here.  Pass &error_abort
  to object_property_del() instead.

* spapr_phb_unrealize()

  Fails and bails out when remove_drcs() fails, but other work is
  already done.  On failure, the device would stay realized with some
  of its resources gone.  Oops.  remove_drcs() fails only when
  chassis_from_bus()'s object_property_get_uint() fails, and it can't
  here.  Pass &error_abort to remove_drcs() instead.

Therefore, no unrealize method can fail before this patch.

device_set_realized()'s recursive unrealization via bus uses
object_property_set_bool().  Can't drop @errp there, so pass
&error_abort.

We similarly unrealize with object_property_set_bool() elsewhere,
always ignoring errors.  Pass &error_abort instead.

Several unrealize methods no longer handle errors from other unrealize
methods: virtio_9p_device_unrealize(),
virtio_input_device_unrealize(), scsi_qdev_unrealize(), ...
Much of the deleted error handling looks wrong anyway.

One unrealize methods no longer ignore such errors:
usb_ehci_pci_exit().

Several realize methods no longer ignore errors when rolling back:
v9fs_device_realize_common(), pci_qdev_unrealize(),
spapr_phb_realize(), usb_qdev_realize(), vfio_ccw_realize(),
virtio_device_realize().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-17-armbru@redhat.com>
2020-05-15 07:08:14 +02:00

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/*
* 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/atomic.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/module.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 "qemu/option.h"
#include "qemu/option_int.h"
#include "qemu/config-file.h"
#include "qapi/qmp/qdict.h"
#include "hw/virtio/virtio-net.h"
#include "net/vhost_net.h"
#include "net/announce.h"
#include "hw/virtio/virtio-bus.h"
#include "qapi/error.h"
#include "qapi/qapi-events-net.h"
#include "hw/qdev-properties.h"
#include "qapi/qapi-types-migration.h"
#include "qapi/qapi-events-migration.h"
#include "hw/virtio/virtio-access.h"
#include "migration/misc.h"
#include "standard-headers/linux/ethtool.h"
#include "sysemu/sysemu.h"
#include "trace.h"
#include "monitor/qdev.h"
#include "hw/pci/pci.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
#define VIRTIO_NET_IP4_ADDR_SIZE 8 /* ipv4 saddr + daddr */
#define VIRTIO_NET_TCP_FLAG 0x3F
#define VIRTIO_NET_TCP_HDR_LENGTH 0xF000
/* IPv4 max payload, 16 bits in the header */
#define VIRTIO_NET_MAX_IP4_PAYLOAD (65535 - sizeof(struct ip_header))
#define VIRTIO_NET_MAX_TCP_PAYLOAD 65535
/* header length value in ip header without option */
#define VIRTIO_NET_IP4_HEADER_LENGTH 5
#define VIRTIO_NET_IP6_ADDR_SIZE 32 /* ipv6 saddr + daddr */
#define VIRTIO_NET_MAX_IP6_PAYLOAD VIRTIO_NET_MAX_TCP_PAYLOAD
/* Purge coalesced packets timer interval, This value affects the performance
a lot, and should be tuned carefully, '300000'(300us) is the recommended
value to pass the WHQL test, '50000' can gain 2x netperf throughput with
tso/gso/gro 'off'. */
#define VIRTIO_NET_RSC_DEFAULT_INTERVAL 300000
/* temporary until standard header include it */
#if !defined(VIRTIO_NET_HDR_F_RSC_INFO)
#define VIRTIO_NET_HDR_F_RSC_INFO 4 /* rsc_ext data in csum_ fields */
#define VIRTIO_NET_F_RSC_EXT 61
#endif
static inline __virtio16 *virtio_net_rsc_ext_num_packets(
struct virtio_net_hdr *hdr)
{
return &hdr->csum_start;
}
static inline __virtio16 *virtio_net_rsc_ext_num_dupacks(
struct virtio_net_hdr *hdr)
{
return &hdr->csum_offset;
}
static VirtIOFeature feature_sizes[] = {
{.flags = 1ULL << VIRTIO_NET_F_MAC,
.end = endof(struct virtio_net_config, mac)},
{.flags = 1ULL << VIRTIO_NET_F_STATUS,
.end = endof(struct virtio_net_config, status)},
{.flags = 1ULL << VIRTIO_NET_F_MQ,
.end = endof(struct virtio_net_config, max_virtqueue_pairs)},
{.flags = 1ULL << VIRTIO_NET_F_MTU,
.end = endof(struct virtio_net_config, mtu)},
{.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX,
.end = endof(struct virtio_net_config, duplex)},
{}
};
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);
virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
netcfg.duplex = n->net_conf.duplex;
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_notify(VirtIONet *net)
{
VirtIODevice *vdev = VIRTIO_DEVICE(net);
trace_virtio_net_announce_notify();
net->status |= VIRTIO_NET_S_ANNOUNCE;
virtio_notify_config(vdev);
}
static void virtio_net_announce_timer(void *opaque)
{
VirtIONet *n = opaque;
trace_virtio_net_announce_timer(n->announce_timer.round);
n->announce_timer.round--;
virtio_net_announce_notify(n);
}
static void virtio_net_announce(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
/*
* Make sure the virtio migration announcement timer isn't running
* If it is, let it trigger announcement so that we do not cause
* confusion.
*/
if (n->announce_timer.round) {
return;
}
if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
virtio_net_announce_notify(n);
}
}
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) {
char *path = object_get_canonical_path(OBJECT(n->qdev));
qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
n->netclient_name, path);
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);
int i;
/* 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.tm);
n->announce_timer.round = 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);
/* Flush any async TX */
for (i = 0; i < n->max_queues; i++) {
NetClientState *nc = qemu_get_subqueue(n->nic, i);
if (nc->peer) {
qemu_flush_or_purge_queued_packets(nc->peer, true);
assert(!virtio_net_get_subqueue(nc)->async_tx.elem);
}
}
}
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 failover_add_primary(VirtIONet *n, Error **errp)
{
Error *err = NULL;
if (n->primary_dev) {
return;
}
n->primary_device_opts = qemu_opts_find(qemu_find_opts("device"),
n->primary_device_id);
if (n->primary_device_opts) {
n->primary_dev = qdev_device_add(n->primary_device_opts, &err);
if (err) {
qemu_opts_del(n->primary_device_opts);
}
if (n->primary_dev) {
n->primary_bus = n->primary_dev->parent_bus;
if (err) {
qdev_unplug(n->primary_dev, &err);
qdev_set_id(n->primary_dev, "");
}
}
} else {
error_setg(errp, "Primary device not found");
error_append_hint(errp, "Virtio-net failover will not work. Make "
"sure primary device has parameter"
" failover_pair_id=<virtio-net-id>\n");
}
if (err) {
error_propagate(errp, err);
}
}
static int is_my_primary(void *opaque, QemuOpts *opts, Error **errp)
{
VirtIONet *n = opaque;
int ret = 0;
const char *standby_id = qemu_opt_get(opts, "failover_pair_id");
if (standby_id != NULL && (g_strcmp0(standby_id, n->netclient_name) == 0)) {
n->primary_device_id = g_strdup(opts->id);
ret = 1;
}
return ret;
}
static DeviceState *virtio_net_find_primary(VirtIONet *n, Error **errp)
{
DeviceState *dev = NULL;
Error *err = NULL;
if (qemu_opts_foreach(qemu_find_opts("device"),
is_my_primary, n, &err)) {
if (err) {
error_propagate(errp, err);
return NULL;
}
if (n->primary_device_id) {
dev = qdev_find_recursive(sysbus_get_default(),
n->primary_device_id);
} else {
error_setg(errp, "Primary device id not found");
return NULL;
}
}
return dev;
}
static DeviceState *virtio_connect_failover_devices(VirtIONet *n,
DeviceState *dev,
Error **errp)
{
DeviceState *prim_dev = NULL;
Error *err = NULL;
prim_dev = virtio_net_find_primary(n, &err);
if (prim_dev) {
n->primary_device_id = g_strdup(prim_dev->id);
n->primary_device_opts = prim_dev->opts;
} else {
if (err) {
error_propagate(errp, err);
}
}
return prim_dev;
}
static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
{
VirtIONet *n = VIRTIO_NET(vdev);
Error *err = NULL;
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));
n->rsc4_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) &&
virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO4);
n->rsc6_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) &&
virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO6);
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);
}
if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) {
qapi_event_send_failover_negotiated(n->netclient_name);
atomic_set(&n->primary_should_be_hidden, false);
failover_add_primary(n, &err);
if (err) {
n->primary_dev = virtio_connect_failover_devices(n, n->qdev, &err);
if (err) {
goto out_err;
}
failover_add_primary(n, &err);
if (err) {
goto out_err;
}
}
}
return;
out_err:
if (err) {
warn_report_err(err);
}
}
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;
}
n->rsc4_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) &&
virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO4);
n->rsc6_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) &&
virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO6);
virtio_clear_feature(&offloads, VIRTIO_NET_F_RSC_EXT);
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)
{
trace_virtio_net_handle_announce(n->announce_timer.round);
if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
n->status & VIRTIO_NET_S_ANNOUNCE) {
n->status &= ~VIRTIO_NET_S_ANNOUNCE;
if (n->announce_timer.round) {
qemu_announce_timer_step(&n->announce_timer);
}
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 bool 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 false;
}
if (nc->queue_index >= n->curr_queues) {
return false;
}
if (!virtio_queue_ready(q->rx_vq) ||
!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return false;
}
return true;
}
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_do_receive(NetClientState *nc, const uint8_t *buf,
size_t size)
{
RCU_READ_LOCK_GUARD();
return virtio_net_receive_rcu(nc, buf, size);
}
static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain,
const uint8_t *buf,
VirtioNetRscUnit *unit)
{
uint16_t ip_hdrlen;
struct ip_header *ip;
ip = (struct ip_header *)(buf + chain->n->guest_hdr_len
+ sizeof(struct eth_header));
unit->ip = (void *)ip;
ip_hdrlen = (ip->ip_ver_len & 0xF) << 2;
unit->ip_plen = &ip->ip_len;
unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) + ip_hdrlen);
unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10;
unit->payload = htons(*unit->ip_plen) - ip_hdrlen - unit->tcp_hdrlen;
}
static void virtio_net_rsc_extract_unit6(VirtioNetRscChain *chain,
const uint8_t *buf,
VirtioNetRscUnit *unit)
{
struct ip6_header *ip6;
ip6 = (struct ip6_header *)(buf + chain->n->guest_hdr_len
+ sizeof(struct eth_header));
unit->ip = ip6;
unit->ip_plen = &(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip)
+ sizeof(struct ip6_header));
unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10;
/* There is a difference between payload lenght in ipv4 and v6,
ip header is excluded in ipv6 */
unit->payload = htons(*unit->ip_plen) - unit->tcp_hdrlen;
}
static size_t virtio_net_rsc_drain_seg(VirtioNetRscChain *chain,
VirtioNetRscSeg *seg)
{
int ret;
struct virtio_net_hdr *h;
h = (struct virtio_net_hdr *)seg->buf;
h->flags = 0;
h->gso_type = VIRTIO_NET_HDR_GSO_NONE;
if (seg->is_coalesced) {
*virtio_net_rsc_ext_num_packets(h) = seg->packets;
*virtio_net_rsc_ext_num_dupacks(h) = seg->dup_ack;
h->flags = VIRTIO_NET_HDR_F_RSC_INFO;
if (chain->proto == ETH_P_IP) {
h->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
} else {
h->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
}
}
ret = virtio_net_do_receive(seg->nc, seg->buf, seg->size);
QTAILQ_REMOVE(&chain->buffers, seg, next);
g_free(seg->buf);
g_free(seg);
return ret;
}
static void virtio_net_rsc_purge(void *opq)
{
VirtioNetRscSeg *seg, *rn;
VirtioNetRscChain *chain = (VirtioNetRscChain *)opq;
QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn) {
if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
chain->stat.purge_failed++;
continue;
}
}
chain->stat.timer++;
if (!QTAILQ_EMPTY(&chain->buffers)) {
timer_mod(chain->drain_timer,
qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout);
}
}
static void virtio_net_rsc_cleanup(VirtIONet *n)
{
VirtioNetRscChain *chain, *rn_chain;
VirtioNetRscSeg *seg, *rn_seg;
QTAILQ_FOREACH_SAFE(chain, &n->rsc_chains, next, rn_chain) {
QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn_seg) {
QTAILQ_REMOVE(&chain->buffers, seg, next);
g_free(seg->buf);
g_free(seg);
}
timer_del(chain->drain_timer);
timer_free(chain->drain_timer);
QTAILQ_REMOVE(&n->rsc_chains, chain, next);
g_free(chain);
}
}
static void virtio_net_rsc_cache_buf(VirtioNetRscChain *chain,
NetClientState *nc,
const uint8_t *buf, size_t size)
{
uint16_t hdr_len;
VirtioNetRscSeg *seg;
hdr_len = chain->n->guest_hdr_len;
seg = g_malloc(sizeof(VirtioNetRscSeg));
seg->buf = g_malloc(hdr_len + sizeof(struct eth_header)
+ sizeof(struct ip6_header) + VIRTIO_NET_MAX_TCP_PAYLOAD);
memcpy(seg->buf, buf, size);
seg->size = size;
seg->packets = 1;
seg->dup_ack = 0;
seg->is_coalesced = 0;
seg->nc = nc;
QTAILQ_INSERT_TAIL(&chain->buffers, seg, next);
chain->stat.cache++;
switch (chain->proto) {
case ETH_P_IP:
virtio_net_rsc_extract_unit4(chain, seg->buf, &seg->unit);
break;
case ETH_P_IPV6:
virtio_net_rsc_extract_unit6(chain, seg->buf, &seg->unit);
break;
default:
g_assert_not_reached();
}
}
static int32_t virtio_net_rsc_handle_ack(VirtioNetRscChain *chain,
VirtioNetRscSeg *seg,
const uint8_t *buf,
struct tcp_header *n_tcp,
struct tcp_header *o_tcp)
{
uint32_t nack, oack;
uint16_t nwin, owin;
nack = htonl(n_tcp->th_ack);
nwin = htons(n_tcp->th_win);
oack = htonl(o_tcp->th_ack);
owin = htons(o_tcp->th_win);
if ((nack - oack) >= VIRTIO_NET_MAX_TCP_PAYLOAD) {
chain->stat.ack_out_of_win++;
return RSC_FINAL;
} else if (nack == oack) {
/* duplicated ack or window probe */
if (nwin == owin) {
/* duplicated ack, add dup ack count due to whql test up to 1 */
chain->stat.dup_ack++;
return RSC_FINAL;
} else {
/* Coalesce window update */
o_tcp->th_win = n_tcp->th_win;
chain->stat.win_update++;
return RSC_COALESCE;
}
} else {
/* pure ack, go to 'C', finalize*/
chain->stat.pure_ack++;
return RSC_FINAL;
}
}
static int32_t virtio_net_rsc_coalesce_data(VirtioNetRscChain *chain,
VirtioNetRscSeg *seg,
const uint8_t *buf,
VirtioNetRscUnit *n_unit)
{
void *data;
uint16_t o_ip_len;
uint32_t nseq, oseq;
VirtioNetRscUnit *o_unit;
o_unit = &seg->unit;
o_ip_len = htons(*o_unit->ip_plen);
nseq = htonl(n_unit->tcp->th_seq);
oseq = htonl(o_unit->tcp->th_seq);
/* out of order or retransmitted. */
if ((nseq - oseq) > VIRTIO_NET_MAX_TCP_PAYLOAD) {
chain->stat.data_out_of_win++;
return RSC_FINAL;
}
data = ((uint8_t *)n_unit->tcp) + n_unit->tcp_hdrlen;
if (nseq == oseq) {
if ((o_unit->payload == 0) && n_unit->payload) {
/* From no payload to payload, normal case, not a dup ack or etc */
chain->stat.data_after_pure_ack++;
goto coalesce;
} else {
return virtio_net_rsc_handle_ack(chain, seg, buf,
n_unit->tcp, o_unit->tcp);
}
} else if ((nseq - oseq) != o_unit->payload) {
/* Not a consistent packet, out of order */
chain->stat.data_out_of_order++;
return RSC_FINAL;
} else {
coalesce:
if ((o_ip_len + n_unit->payload) > chain->max_payload) {
chain->stat.over_size++;
return RSC_FINAL;
}
/* Here comes the right data, the payload length in v4/v6 is different,
so use the field value to update and record the new data len */
o_unit->payload += n_unit->payload; /* update new data len */
/* update field in ip header */
*o_unit->ip_plen = htons(o_ip_len + n_unit->payload);
/* Bring 'PUSH' big, the whql test guide says 'PUSH' can be coalesced
for windows guest, while this may change the behavior for linux
guest (only if it uses RSC feature). */
o_unit->tcp->th_offset_flags = n_unit->tcp->th_offset_flags;
o_unit->tcp->th_ack = n_unit->tcp->th_ack;
o_unit->tcp->th_win = n_unit->tcp->th_win;
memmove(seg->buf + seg->size, data, n_unit->payload);
seg->size += n_unit->payload;
seg->packets++;
chain->stat.coalesced++;
return RSC_COALESCE;
}
}
static int32_t virtio_net_rsc_coalesce4(VirtioNetRscChain *chain,
VirtioNetRscSeg *seg,
const uint8_t *buf, size_t size,
VirtioNetRscUnit *unit)
{
struct ip_header *ip1, *ip2;
ip1 = (struct ip_header *)(unit->ip);
ip2 = (struct ip_header *)(seg->unit.ip);
if ((ip1->ip_src ^ ip2->ip_src) || (ip1->ip_dst ^ ip2->ip_dst)
|| (unit->tcp->th_sport ^ seg->unit.tcp->th_sport)
|| (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) {
chain->stat.no_match++;
return RSC_NO_MATCH;
}
return virtio_net_rsc_coalesce_data(chain, seg, buf, unit);
}
static int32_t virtio_net_rsc_coalesce6(VirtioNetRscChain *chain,
VirtioNetRscSeg *seg,
const uint8_t *buf, size_t size,
VirtioNetRscUnit *unit)
{
struct ip6_header *ip1, *ip2;
ip1 = (struct ip6_header *)(unit->ip);
ip2 = (struct ip6_header *)(seg->unit.ip);
if (memcmp(&ip1->ip6_src, &ip2->ip6_src, sizeof(struct in6_address))
|| memcmp(&ip1->ip6_dst, &ip2->ip6_dst, sizeof(struct in6_address))
|| (unit->tcp->th_sport ^ seg->unit.tcp->th_sport)
|| (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) {
chain->stat.no_match++;
return RSC_NO_MATCH;
}
return virtio_net_rsc_coalesce_data(chain, seg, buf, unit);
}
/* Packets with 'SYN' should bypass, other flag should be sent after drain
* to prevent out of order */
static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain,
struct tcp_header *tcp)
{
uint16_t tcp_hdr;
uint16_t tcp_flag;
tcp_flag = htons(tcp->th_offset_flags);
tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10;
tcp_flag &= VIRTIO_NET_TCP_FLAG;
tcp_flag = htons(tcp->th_offset_flags) & 0x3F;
if (tcp_flag & TH_SYN) {
chain->stat.tcp_syn++;
return RSC_BYPASS;
}
if (tcp_flag & (TH_FIN | TH_URG | TH_RST | TH_ECE | TH_CWR)) {
chain->stat.tcp_ctrl_drain++;
return RSC_FINAL;
}
if (tcp_hdr > sizeof(struct tcp_header)) {
chain->stat.tcp_all_opt++;
return RSC_FINAL;
}
return RSC_CANDIDATE;
}
static size_t virtio_net_rsc_do_coalesce(VirtioNetRscChain *chain,
NetClientState *nc,
const uint8_t *buf, size_t size,
VirtioNetRscUnit *unit)
{
int ret;
VirtioNetRscSeg *seg, *nseg;
if (QTAILQ_EMPTY(&chain->buffers)) {
chain->stat.empty_cache++;
virtio_net_rsc_cache_buf(chain, nc, buf, size);
timer_mod(chain->drain_timer,
qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout);
return size;
}
QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) {
if (chain->proto == ETH_P_IP) {
ret = virtio_net_rsc_coalesce4(chain, seg, buf, size, unit);
} else {
ret = virtio_net_rsc_coalesce6(chain, seg, buf, size, unit);
}
if (ret == RSC_FINAL) {
if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
/* Send failed */
chain->stat.final_failed++;
return 0;
}
/* Send current packet */
return virtio_net_do_receive(nc, buf, size);
} else if (ret == RSC_NO_MATCH) {
continue;
} else {
/* Coalesced, mark coalesced flag to tell calc cksum for ipv4 */
seg->is_coalesced = 1;
return size;
}
}
chain->stat.no_match_cache++;
virtio_net_rsc_cache_buf(chain, nc, buf, size);
return size;
}
/* Drain a connection data, this is to avoid out of order segments */
static size_t virtio_net_rsc_drain_flow(VirtioNetRscChain *chain,
NetClientState *nc,
const uint8_t *buf, size_t size,
uint16_t ip_start, uint16_t ip_size,
uint16_t tcp_port)
{
VirtioNetRscSeg *seg, *nseg;
uint32_t ppair1, ppair2;
ppair1 = *(uint32_t *)(buf + tcp_port);
QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) {
ppair2 = *(uint32_t *)(seg->buf + tcp_port);
if (memcmp(buf + ip_start, seg->buf + ip_start, ip_size)
|| (ppair1 != ppair2)) {
continue;
}
if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
chain->stat.drain_failed++;
}
break;
}
return virtio_net_do_receive(nc, buf, size);
}
static int32_t virtio_net_rsc_sanity_check4(VirtioNetRscChain *chain,
struct ip_header *ip,
const uint8_t *buf, size_t size)
{
uint16_t ip_len;
/* Not an ipv4 packet */
if (((ip->ip_ver_len & 0xF0) >> 4) != IP_HEADER_VERSION_4) {
chain->stat.ip_option++;
return RSC_BYPASS;
}
/* Don't handle packets with ip option */
if ((ip->ip_ver_len & 0xF) != VIRTIO_NET_IP4_HEADER_LENGTH) {
chain->stat.ip_option++;
return RSC_BYPASS;
}
if (ip->ip_p != IPPROTO_TCP) {
chain->stat.bypass_not_tcp++;
return RSC_BYPASS;
}
/* Don't handle packets with ip fragment */
if (!(htons(ip->ip_off) & IP_DF)) {
chain->stat.ip_frag++;
return RSC_BYPASS;
}
/* Don't handle packets with ecn flag */
if (IPTOS_ECN(ip->ip_tos)) {
chain->stat.ip_ecn++;
return RSC_BYPASS;
}
ip_len = htons(ip->ip_len);
if (ip_len < (sizeof(struct ip_header) + sizeof(struct tcp_header))
|| ip_len > (size - chain->n->guest_hdr_len -
sizeof(struct eth_header))) {
chain->stat.ip_hacked++;
return RSC_BYPASS;
}
return RSC_CANDIDATE;
}
static size_t virtio_net_rsc_receive4(VirtioNetRscChain *chain,
NetClientState *nc,
const uint8_t *buf, size_t size)
{
int32_t ret;
uint16_t hdr_len;
VirtioNetRscUnit unit;
hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len;
if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header)
+ sizeof(struct tcp_header))) {
chain->stat.bypass_not_tcp++;
return virtio_net_do_receive(nc, buf, size);
}
virtio_net_rsc_extract_unit4(chain, buf, &unit);
if (virtio_net_rsc_sanity_check4(chain, unit.ip, buf, size)
!= RSC_CANDIDATE) {
return virtio_net_do_receive(nc, buf, size);
}
ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp);
if (ret == RSC_BYPASS) {
return virtio_net_do_receive(nc, buf, size);
} else if (ret == RSC_FINAL) {
return virtio_net_rsc_drain_flow(chain, nc, buf, size,
((hdr_len + sizeof(struct eth_header)) + 12),
VIRTIO_NET_IP4_ADDR_SIZE,
hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header));
}
return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit);
}
static int32_t virtio_net_rsc_sanity_check6(VirtioNetRscChain *chain,
struct ip6_header *ip6,
const uint8_t *buf, size_t size)
{
uint16_t ip_len;
if (((ip6->ip6_ctlun.ip6_un1.ip6_un1_flow & 0xF0) >> 4)
!= IP_HEADER_VERSION_6) {
return RSC_BYPASS;
}
/* Both option and protocol is checked in this */
if (ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) {
chain->stat.bypass_not_tcp++;
return RSC_BYPASS;
}
ip_len = htons(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
if (ip_len < sizeof(struct tcp_header) ||
ip_len > (size - chain->n->guest_hdr_len - sizeof(struct eth_header)
- sizeof(struct ip6_header))) {
chain->stat.ip_hacked++;
return RSC_BYPASS;
}
/* Don't handle packets with ecn flag */
if (IP6_ECN(ip6->ip6_ctlun.ip6_un3.ip6_un3_ecn)) {
chain->stat.ip_ecn++;
return RSC_BYPASS;
}
return RSC_CANDIDATE;
}
static size_t virtio_net_rsc_receive6(void *opq, NetClientState *nc,
const uint8_t *buf, size_t size)
{
int32_t ret;
uint16_t hdr_len;
VirtioNetRscChain *chain;
VirtioNetRscUnit unit;
chain = (VirtioNetRscChain *)opq;
hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len;
if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip6_header)
+ sizeof(tcp_header))) {
return virtio_net_do_receive(nc, buf, size);
}
virtio_net_rsc_extract_unit6(chain, buf, &unit);
if (RSC_CANDIDATE != virtio_net_rsc_sanity_check6(chain,
unit.ip, buf, size)) {
return virtio_net_do_receive(nc, buf, size);
}
ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp);
if (ret == RSC_BYPASS) {
return virtio_net_do_receive(nc, buf, size);
} else if (ret == RSC_FINAL) {
return virtio_net_rsc_drain_flow(chain, nc, buf, size,
((hdr_len + sizeof(struct eth_header)) + 8),
VIRTIO_NET_IP6_ADDR_SIZE,
hdr_len + sizeof(struct eth_header)
+ sizeof(struct ip6_header));
}
return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit);
}
static VirtioNetRscChain *virtio_net_rsc_lookup_chain(VirtIONet *n,
NetClientState *nc,
uint16_t proto)
{
VirtioNetRscChain *chain;
if ((proto != (uint16_t)ETH_P_IP) && (proto != (uint16_t)ETH_P_IPV6)) {
return NULL;
}
QTAILQ_FOREACH(chain, &n->rsc_chains, next) {
if (chain->proto == proto) {
return chain;
}
}
chain = g_malloc(sizeof(*chain));
chain->n = n;
chain->proto = proto;
if (proto == (uint16_t)ETH_P_IP) {
chain->max_payload = VIRTIO_NET_MAX_IP4_PAYLOAD;
chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
} else {
chain->max_payload = VIRTIO_NET_MAX_IP6_PAYLOAD;
chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
}
chain->drain_timer = timer_new_ns(QEMU_CLOCK_HOST,
virtio_net_rsc_purge, chain);
memset(&chain->stat, 0, sizeof(chain->stat));
QTAILQ_INIT(&chain->buffers);
QTAILQ_INSERT_TAIL(&n->rsc_chains, chain, next);
return chain;
}
static ssize_t virtio_net_rsc_receive(NetClientState *nc,
const uint8_t *buf,
size_t size)
{
uint16_t proto;
VirtioNetRscChain *chain;
struct eth_header *eth;
VirtIONet *n;
n = qemu_get_nic_opaque(nc);
if (size < (n->host_hdr_len + sizeof(struct eth_header))) {
return virtio_net_do_receive(nc, buf, size);
}
eth = (struct eth_header *)(buf + n->guest_hdr_len);
proto = htons(eth->h_proto);
chain = virtio_net_rsc_lookup_chain(n, nc, proto);
if (chain) {
chain->stat.received++;
if (proto == (uint16_t)ETH_P_IP && n->rsc4_enabled) {
return virtio_net_rsc_receive4(chain, nc, buf, size);
} else if (proto == (uint16_t)ETH_P_IPV6 && n->rsc6_enabled) {
return virtio_net_rsc_receive6(chain, nc, buf, size);
}
}
return virtio_net_do_receive(nc, buf, size);
}
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
size_t size)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
if ((n->rsc4_enabled || n->rsc6_enabled)) {
return virtio_net_rsc_receive(nc, buf, size);
} else {
return virtio_net_do_receive(nc, buf, 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);
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 two 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;
trace_virtio_net_post_load_device();
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);
}
/*
* curr_guest_offloads will be later overwritten by the
* virtio_set_features_nocheck call done from the virtio_load.
* Here we make sure it is preserved and restored accordingly
* in the virtio_net_post_load_virtio callback.
*/
n->saved_guest_offloads = n->curr_guest_offloads;
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)) {
qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(),
QEMU_CLOCK_VIRTUAL,
virtio_net_announce_timer, n);
if (n->announce_timer.round) {
timer_mod(n->announce_timer.tm,
qemu_clock_get_ms(n->announce_timer.type));
} else {
qemu_announce_timer_del(&n->announce_timer, false);
}
}
return 0;
}
static int virtio_net_post_load_virtio(VirtIODevice *vdev)
{
VirtIONet *n = VIRTIO_NET(vdev);
/*
* The actual needed state is now in saved_guest_offloads,
* see virtio_net_post_load_device for detail.
* Restore it back and apply the desired offloads.
*/
n->curr_guest_offloads = n->saved_guest_offloads;
if (peer_has_vnet_hdr(n)) {
virtio_net_apply_guest_offloads(n);
}
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,
.announce = virtio_net_announce,
};
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)
{
virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
n->config_size = virtio_feature_get_config_size(feature_sizes,
host_features);
}
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 bool failover_unplug_primary(VirtIONet *n)
{
HotplugHandler *hotplug_ctrl;
PCIDevice *pci_dev;
Error *err = NULL;
hotplug_ctrl = qdev_get_hotplug_handler(n->primary_dev);
if (hotplug_ctrl) {
pci_dev = PCI_DEVICE(n->primary_dev);
pci_dev->partially_hotplugged = true;
hotplug_handler_unplug_request(hotplug_ctrl, n->primary_dev, &err);
if (err) {
error_report_err(err);
return false;
}
} else {
return false;
}
return true;
}
static bool failover_replug_primary(VirtIONet *n, Error **errp)
{
Error *err = NULL;
HotplugHandler *hotplug_ctrl;
PCIDevice *pdev = PCI_DEVICE(n->primary_dev);
if (!pdev->partially_hotplugged) {
return true;
}
if (!n->primary_device_opts) {
n->primary_device_opts = qemu_opts_from_qdict(
qemu_find_opts("device"),
n->primary_device_dict, errp);
if (!n->primary_device_opts) {
return false;
}
}
n->primary_bus = n->primary_dev->parent_bus;
if (!n->primary_bus) {
error_setg(errp, "virtio_net: couldn't find primary bus");
return false;
}
qdev_set_parent_bus(n->primary_dev, n->primary_bus);
n->primary_should_be_hidden = false;
qemu_opt_set_bool(n->primary_device_opts,
"partially_hotplugged", true, &err);
if (err) {
goto out;
}
hotplug_ctrl = qdev_get_hotplug_handler(n->primary_dev);
if (hotplug_ctrl) {
hotplug_handler_pre_plug(hotplug_ctrl, n->primary_dev, &err);
if (err) {
goto out;
}
hotplug_handler_plug(hotplug_ctrl, n->primary_dev, errp);
}
out:
error_propagate(errp, err);
return !err;
}
static void virtio_net_handle_migration_primary(VirtIONet *n,
MigrationState *s)
{
bool should_be_hidden;
Error *err = NULL;
should_be_hidden = atomic_read(&n->primary_should_be_hidden);
if (!n->primary_dev) {
n->primary_dev = virtio_connect_failover_devices(n, n->qdev, &err);
if (!n->primary_dev) {
return;
}
}
if (migration_in_setup(s) && !should_be_hidden) {
if (failover_unplug_primary(n)) {
vmstate_unregister(VMSTATE_IF(n->primary_dev),
qdev_get_vmsd(n->primary_dev),
n->primary_dev);
qapi_event_send_unplug_primary(n->primary_device_id);
atomic_set(&n->primary_should_be_hidden, true);
} else {
warn_report("couldn't unplug primary device");
}
} else if (migration_has_failed(s)) {
/* We already unplugged the device let's plug it back */
if (!failover_replug_primary(n, &err)) {
if (err) {
error_report_err(err);
}
}
}
}
static void virtio_net_migration_state_notifier(Notifier *notifier, void *data)
{
MigrationState *s = data;
VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
virtio_net_handle_migration_primary(n, s);
}
static int virtio_net_primary_should_be_hidden(DeviceListener *listener,
QemuOpts *device_opts)
{
VirtIONet *n = container_of(listener, VirtIONet, primary_listener);
bool match_found = false;
bool hide = false;
if (!device_opts) {
return -1;
}
n->primary_device_dict = qemu_opts_to_qdict(device_opts,
n->primary_device_dict);
if (n->primary_device_dict) {
g_free(n->standby_id);
n->standby_id = g_strdup(qdict_get_try_str(n->primary_device_dict,
"failover_pair_id"));
}
if (g_strcmp0(n->standby_id, n->netclient_name) == 0) {
match_found = true;
} else {
match_found = false;
hide = false;
g_free(n->standby_id);
n->primary_device_dict = NULL;
goto out;
}
n->primary_device_opts = device_opts;
/* primary_should_be_hidden is set during feature negotiation */
hide = atomic_read(&n->primary_should_be_hidden);
if (n->primary_device_dict) {
g_free(n->primary_device_id);
n->primary_device_id = g_strdup(qdict_get_try_str(
n->primary_device_dict, "id"));
if (!n->primary_device_id) {
warn_report("primary_device_id not set");
}
}
out:
if (match_found && hide) {
return 1;
} else if (match_found && !hide) {
return 0;
} else {
return -1;
}
}
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 |= (1ULL << VIRTIO_NET_F_MTU);
}
if (n->net_conf.duplex_str) {
if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
n->net_conf.duplex = DUPLEX_HALF;
} else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
n->net_conf.duplex = DUPLEX_FULL;
} else {
error_setg(errp, "'duplex' must be 'half' or 'full'");
return;
}
n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
} else {
n->net_conf.duplex = DUPLEX_UNKNOWN;
}
if (n->net_conf.speed < SPEED_UNKNOWN) {
error_setg(errp, "'speed' must be between 0 and INT_MAX");
return;
}
if (n->net_conf.speed >= 0) {
n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
}
if (n->failover) {
n->primary_listener.should_be_hidden =
virtio_net_primary_should_be_hidden;
atomic_set(&n->primary_should_be_hidden, true);
device_listener_register(&n->primary_listener);
n->migration_state.notify = virtio_net_migration_state_notifier;
add_migration_state_change_notifier(&n->migration_state);
n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY);
}
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")) {
warn_report("virtio-net: "
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
n->net_conf.tx);
error_printf("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;
qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(),
QEMU_CLOCK_VIRTUAL,
virtio_net_announce_timer, n);
n->announce_timer.round = 0;
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;
QTAILQ_INIT(&n->rsc_chains);
n->qdev = dev;
}
static void virtio_net_device_unrealize(DeviceState *dev)
{
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);
if (n->failover) {
g_free(n->primary_device_id);
g_free(n->standby_id);
qobject_unref(n->primary_device_dict);
n->primary_device_dict = NULL;
}
max_queues = n->multiqueue ? n->max_queues : 1;
for (i = 0; i < max_queues; i++) {
virtio_net_del_queue(n, i);
}
/* delete also control vq */
virtio_del_queue(vdev, max_queues * 2);
qemu_announce_timer_del(&n->announce_timer, false);
g_free(n->vqs);
qemu_del_nic(n->nic);
virtio_net_rsc_cleanup(n);
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));
}
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 bool primary_unplug_pending(void *opaque)
{
DeviceState *dev = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIONet *n = VIRTIO_NET(vdev);
if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
return false;
}
return n->primary_dev ? n->primary_dev->pending_deleted_event : false;
}
static bool dev_unplug_pending(void *opaque)
{
DeviceState *dev = opaque;
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
return vdc->primary_unplug_pending(dev);
}
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,
.dev_unplug_pending = dev_unplug_pending,
};
static Property virtio_net_properties[] = {
DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
VIRTIO_NET_F_CSUM, true),
DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
VIRTIO_NET_F_GUEST_CSUM, true),
DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
VIRTIO_NET_F_GUEST_TSO4, true),
DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
VIRTIO_NET_F_GUEST_TSO6, true),
DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
VIRTIO_NET_F_GUEST_ECN, true),
DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
VIRTIO_NET_F_GUEST_UFO, true),
DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
VIRTIO_NET_F_GUEST_ANNOUNCE, true),
DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
VIRTIO_NET_F_HOST_TSO4, true),
DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
VIRTIO_NET_F_HOST_TSO6, true),
DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
VIRTIO_NET_F_HOST_ECN, true),
DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
VIRTIO_NET_F_HOST_UFO, true),
DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
VIRTIO_NET_F_MRG_RXBUF, true),
DEFINE_PROP_BIT64("status", VirtIONet, host_features,
VIRTIO_NET_F_STATUS, true),
DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
VIRTIO_NET_F_CTRL_VQ, true),
DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
VIRTIO_NET_F_CTRL_RX, true),
DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
VIRTIO_NET_F_CTRL_VLAN, true),
DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
VIRTIO_NET_F_CTRL_RX_EXTRA, true),
DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
VIRTIO_NET_F_CTRL_MAC_ADDR, true),
DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
VIRTIO_NET_F_RSC_EXT, false),
DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
VIRTIO_NET_RSC_DEFAULT_INTERVAL),
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_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
DEFINE_PROP_BOOL("failover", VirtIONet, failover, false),
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);
device_class_set_props(dc, 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->post_load = virtio_net_post_load_virtio;
vdc->vmsd = &vmstate_virtio_net_device;
vdc->primary_unplug_pending = primary_unplug_pending;
}
static const TypeInfo virtio_net_info = {
.name = TYPE_VIRTIO_NET,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VirtIONet),
.instance_init = virtio_net_instance_init,
.class_init = virtio_net_class_init,
};
static void virtio_register_types(void)
{
type_register_static(&virtio_net_info);
}
type_init(virtio_register_types)
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