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qemu-e2k/hw/net/virtio-net.c
Markus Armbruster 5a0948d36c net/virtio: Fix failover error handling crash bugs 
Functions that take an Error ** parameter to pass an error to the
caller expect the parameter to point to null.
failover_replug_primary() violates this precondition in several
places:

* After qemu_opts_from_qdict() failed, *errp is no longer null.
  Passing it to error_setg() is wrong, and will trip the assertion in
  error_setv().  Messed up in commit 150ab54aa6 "net/virtio: fix
  re-plugging of primary device".  Simply drop the error_setg().

* Passing @errp to qemu_opt_set_bool(), hotplug_handler_pre_plug(),
  and hotplug_handler_plug() is wrong.  If one of the first two fails,
  *errp is no longer null.  Risks tripping the same assertion.
  Moreover, continuing after such errors is unsafe.  Messed up in
  commit 9711cd0dfc "net/virtio: add failover support".  Fix by
  handling each error properly.

failover_replug_primary() crashes when passed a null @errp.  Also
messed up in commit 9711cd0dfc.  This bug can't bite as no caller
actually passes null.  Fix it anyway.

Fixes: 9711cd0dfc
Fixes: 150ab54aa6
Cc: Jens Freimann <jfreimann@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20191130194240.10517-3-armbru@redhat.com>
Reviewed-by: Jens Freimann <jfreimann@redhat.com>
2019-12-02 16:14:38 +01:00

3271 lines
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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
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;
}
#endif
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) {
gchar *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 int virtio_net_can_receive(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
if (!vdev->vm_running) {
return 0;
}
if (nc->queue_index >= n->curr_queues) {
return 0;
}
if (!virtio_queue_ready(q->rx_vq) ||
!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return 0;
}
return 1;
}
static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
{
VirtIONet *n = q->n;
if (virtio_queue_empty(q->rx_vq) ||
(n->mergeable_rx_bufs &&
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
virtio_queue_set_notification(q->rx_vq, 1);
/* To avoid a race condition where the guest has made some buffers
* available after the above check but before notification was
* enabled, check for available buffers again.
*/
if (virtio_queue_empty(q->rx_vq) ||
(n->mergeable_rx_bufs &&
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
return 0;
}
}
virtio_queue_set_notification(q->rx_vq, 0);
return 1;
}
static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
{
virtio_tswap16s(vdev, &hdr->hdr_len);
virtio_tswap16s(vdev, &hdr->gso_size);
virtio_tswap16s(vdev, &hdr->csum_start);
virtio_tswap16s(vdev, &hdr->csum_offset);
}
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
* it never finds out that the packets don't have valid checksums. This
* causes dhclient to get upset. Fedora's carried a patch for ages to
* fix this with Xen but it hasn't appeared in an upstream release of
* dhclient yet.
*
* To avoid breaking existing guests, we catch udp packets and add
* checksums. This is terrible but it's better than hacking the guest
* kernels.
*
* N.B. if we introduce a zero-copy API, this operation is no longer free so
* we should provide a mechanism to disable it to avoid polluting the host
* cache.
*/
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
uint8_t *buf, size_t size)
{
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
(size > 27 && size < 1500) && /* normal sized MTU */
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
(buf[23] == 17) && /* ip.protocol == UDP */
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
net_checksum_calculate(buf, size);
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
}
}
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
const void *buf, size_t size)
{
if (n->has_vnet_hdr) {
/* FIXME this cast is evil */
void *wbuf = (void *)buf;
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
size - n->host_hdr_len);
if (n->needs_vnet_hdr_swap) {
virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
}
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
} else {
struct virtio_net_hdr hdr = {
.flags = 0,
.gso_type = VIRTIO_NET_HDR_GSO_NONE
};
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
}
}
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
{
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static const uint8_t vlan[] = {0x81, 0x00};
uint8_t *ptr = (uint8_t *)buf;
int i;
if (n->promisc)
return 1;
ptr += n->host_hdr_len;
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
int vid = lduw_be_p(ptr + 14) & 0xfff;
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
return 0;
}
if (ptr[0] & 1) { // multicast
if (!memcmp(ptr, bcast, sizeof(bcast))) {
return !n->nobcast;
} else if (n->nomulti) {
return 0;
} else if (n->allmulti || n->mac_table.multi_overflow) {
return 1;
}
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
return 1;
}
}
} else { // unicast
if (n->nouni) {
return 0;
} else if (n->alluni || n->mac_table.uni_overflow) {
return 1;
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
return 1;
}
for (i = 0; i < n->mac_table.first_multi; i++) {
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
return 1;
}
}
}
return 0;
}
static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
size_t size)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
struct virtio_net_hdr_mrg_rxbuf mhdr;
unsigned mhdr_cnt = 0;
size_t offset, i, guest_offset;
if (!virtio_net_can_receive(nc)) {
return -1;
}
/* hdr_len refers to the header we supply to the guest */
if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
return 0;
}
if (!receive_filter(n, buf, size))
return size;
offset = i = 0;
while (offset < size) {
VirtQueueElement *elem;
int len, total;
const struct iovec *sg;
total = 0;
elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
if (!elem) {
if (i) {
virtio_error(vdev, "virtio-net unexpected empty queue: "
"i %zd mergeable %d offset %zd, size %zd, "
"guest hdr len %zd, host hdr len %zd "
"guest features 0x%" PRIx64,
i, n->mergeable_rx_bufs, offset, size,
n->guest_hdr_len, n->host_hdr_len,
vdev->guest_features);
}
return -1;
}
if (elem->in_num < 1) {
virtio_error(vdev,
"virtio-net receive queue contains no in buffers");
virtqueue_detach_element(q->rx_vq, elem, 0);
g_free(elem);
return -1;
}
sg = elem->in_sg;
if (i == 0) {
assert(offset == 0);
if (n->mergeable_rx_bufs) {
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
sg, elem->in_num,
offsetof(typeof(mhdr), num_buffers),
sizeof(mhdr.num_buffers));
}
receive_header(n, sg, elem->in_num, buf, size);
offset = n->host_hdr_len;
total += n->guest_hdr_len;
guest_offset = n->guest_hdr_len;
} else {
guest_offset = 0;
}
/* copy in packet. ugh */
len = iov_from_buf(sg, elem->in_num, guest_offset,
buf + offset, size - offset);
total += len;
offset += len;
/* If buffers can't be merged, at this point we
* must have consumed the complete packet.
* Otherwise, drop it. */
if (!n->mergeable_rx_bufs && offset < size) {
virtqueue_unpop(q->rx_vq, elem, total);
g_free(elem);
return size;
}
/* signal other side */
virtqueue_fill(q->rx_vq, elem, total, i++);
g_free(elem);
}
if (mhdr_cnt) {
virtio_stw_p(vdev, &mhdr.num_buffers, i);
iov_from_buf(mhdr_sg, mhdr_cnt,
0,
&mhdr.num_buffers, sizeof mhdr.num_buffers);
}
virtqueue_flush(q->rx_vq, i);
virtio_notify(vdev, q->rx_vq);
return size;
}
static ssize_t virtio_net_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(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'");
}
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");
} else 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, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIONet *n = VIRTIO_NET(dev);
int i, max_queues;
/* This will stop vhost backend if appropriate. */
virtio_net_set_status(vdev, 0);
g_free(n->netclient_name);
n->netclient_name = NULL;
g_free(n->netclient_type);
n->netclient_type = NULL;
g_free(n->mac_table.macs);
g_free(n->vlans);
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);
}
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), NULL);
}
static int virtio_net_pre_save(void *opaque)
{
VirtIONet *n = opaque;
/* At this point, backend must be stopped, otherwise
* it might keep writing to memory. */
assert(!n->vhost_started);
return 0;
}
static 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);
dc->props = virtio_net_properties;
dc->vmsd = &vmstate_virtio_net;
set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
vdc->realize = virtio_net_device_realize;
vdc->unrealize = virtio_net_device_unrealize;
vdc->get_config = virtio_net_get_config;
vdc->set_config = virtio_net_set_config;
vdc->get_features = virtio_net_get_features;
vdc->set_features = virtio_net_set_features;
vdc->bad_features = virtio_net_bad_features;
vdc->reset = virtio_net_reset;
vdc->set_status = virtio_net_set_status;
vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
vdc->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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