blob: 1067e72b397555794f3fd8b44c35112ea7944215 [file] [log] [blame]
/*
* 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"
#include "net_rx_pkt.h"
#include "hw/virtio/vhost.h"
#include "sysemu/qtest.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 queue_pairs; 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
#define VIRTIO_NET_RSS_SUPPORTED_HASHES (VIRTIO_NET_RSS_HASH_TYPE_IPv4 | \
VIRTIO_NET_RSS_HASH_TYPE_TCPv4 | \
VIRTIO_NET_RSS_HASH_TYPE_UDPv4 | \
VIRTIO_NET_RSS_HASH_TYPE_IPv6 | \
VIRTIO_NET_RSS_HASH_TYPE_TCPv6 | \
VIRTIO_NET_RSS_HASH_TYPE_UDPv6 | \
VIRTIO_NET_RSS_HASH_TYPE_IP_EX | \
VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | \
VIRTIO_NET_RSS_HASH_TYPE_UDP_EX)
static const 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)},
{.flags = (1ULL << VIRTIO_NET_F_RSS) | (1ULL << VIRTIO_NET_F_HASH_REPORT),
.end = endof(struct virtio_net_config, supported_hash_types)},
{}
};
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;
NetClientState *nc = qemu_get_queue(n->nic);
static const MACAddr zero = { .a = { 0, 0, 0, 0, 0, 0 } };
int ret = 0;
memset(&netcfg, 0 , sizeof(struct virtio_net_config));
virtio_stw_p(vdev, &netcfg.status, n->status);
virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queue_pairs);
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;
netcfg.rss_max_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
virtio_stw_p(vdev, &netcfg.rss_max_indirection_table_length,
virtio_host_has_feature(vdev, VIRTIO_NET_F_RSS) ?
VIRTIO_NET_RSS_MAX_TABLE_LEN : 1);
virtio_stl_p(vdev, &netcfg.supported_hash_types,
VIRTIO_NET_RSS_SUPPORTED_HASHES);
memcpy(config, &netcfg, n->config_size);
/*
* Is this VDPA? No peer means not VDPA: there's no way to
* disconnect/reconnect a VDPA peer.
*/
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
n->config_size);
if (ret != -1) {
/*
* Some NIC/kernel combinations present 0 as the mac address. As
* that is not a legal address, try to proceed with the
* address from the QEMU command line in the hope that the
* address has been configured correctly elsewhere - just not
* reported by the device.
*/
if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) {
info_report("Zero hardware mac address detected. Ignoring.");
memcpy(netcfg.mac, n->mac, ETH_ALEN);
}
memcpy(config, &netcfg, n->config_size);
}
}
}
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg = {};
NetClientState *nc = qemu_get_queue(n->nic);
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);
}
/*
* Is this VDPA? No peer means not VDPA: there's no way to
* disconnect/reconnect a VDPA peer.
*/
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
vhost_net_set_config(get_vhost_net(nc->peer),
(uint8_t *)&netcfg, 0, n->config_size,
VHOST_SET_CONFIG_TYPE_MASTER);
}
}
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 queue_pairs = n->multiqueue ? n->max_queue_pairs : 1;
int cvq = n->max_ncs - n->max_queue_pairs;
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 < queue_pairs; 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, queue_pairs, cvq);
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, queue_pairs, cvq);
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 queue_pairs, bool enable)
{
int i;
for (i = 0; i < queue_pairs; 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 queue_pairs = n->multiqueue ? n->max_queue_pairs : 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,
queue_pairs, 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, queue_pairs, 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_queue_pairs; i++) {
NetClientState *ncs = qemu_get_subqueue(n->nic, i);
bool queue_started;
q = &n->vqs[i];
if ((!n->multiqueue && i != 0) || i >= n->curr_queue_pairs) {
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;
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)) {
QAPI_LIST_PREPEND(list, (i << 5) + j);
}
}
}
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;
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++) {
QAPI_LIST_PREPEND(str_list,
qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN));
}
info->unicast_table = str_list;
str_list = NULL;
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
QAPI_LIST_PREPEND(str_list,
qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN));
}
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_queue_pairs = 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_queue_pairs; 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 hash_report)
{
int i;
NetClientState *nc;
n->mergeable_rx_bufs = mergeable_rx_bufs;
if (version_1) {
n->guest_hdr_len = hash_report ?
sizeof(struct virtio_net_hdr_v1_hash) :
sizeof(struct virtio_net_hdr_mrg_rxbuf);
n->rss_data.populate_hash = !!hash_report;
} 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_queue_pairs; 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 or vhost-vdpa don't support max queue
* size.
*/
if (!peer) {
return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
}
switch(peer->info->type) {
case NET_CLIENT_DRIVER_VHOST_USER:
case NET_CLIENT_DRIVER_VHOST_VDPA:
return VIRTQUEUE_MAX_SIZE;
default:
return VIRTIO_NET_TX_QUEUE_DEFAULT_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_queue_pairs == 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_queue_pairs(VirtIONet *n)
{
int i;
int r;
if (n->nic->peer_deleted) {
return;
}
for (i = 0; i < n->max_queue_pairs; i++) {
if (i < n->curr_queue_pairs) {
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);
virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
}
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;
}
if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
}
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);
}
typedef struct {
VirtIONet *n;
DeviceState *dev;
} FailoverDevice;
/**
* Set the failover primary device
*
* @opaque: FailoverId to setup
* @opts: opts for device we are handling
* @errp: returns an error if this function fails
*/
static int failover_set_primary(DeviceState *dev, void *opaque)
{
FailoverDevice *fdev = opaque;
PCIDevice *pci_dev = (PCIDevice *)
object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE);
if (!pci_dev) {
return 0;
}
if (!g_strcmp0(pci_dev->failover_pair_id, fdev->n->netclient_name)) {
fdev->dev = dev;
return 1;
}
return 0;
}
/**
* Find the primary device for this failover virtio-net
*
* @n: VirtIONet device
* @errp: returns an error if this function fails
*/
static DeviceState *failover_find_primary_device(VirtIONet *n)
{
FailoverDevice fdev = {
.n = n,
};
qbus_walk_children(sysbus_get_default(), failover_set_primary, NULL,
NULL, NULL, &fdev);
return fdev.dev;
}
static void failover_add_primary(VirtIONet *n, Error **errp)
{
Error *err = NULL;
DeviceState *dev = failover_find_primary_device(n);
if (dev) {
return;
}
if (!n->primary_opts) {
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=%s\n", n->netclient_name);
return;
}
dev = qdev_device_add_from_qdict(n->primary_opts,
n->primary_opts_from_json,
&err);
if (err) {
qobject_unref(n->primary_opts);
n->primary_opts = NULL;
} else {
object_unref(OBJECT(dev));
}
error_propagate(errp, err);
}
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_RSS) ||
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),
virtio_has_feature(features,
VIRTIO_NET_F_HASH_REPORT));
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);
n->rss_data.redirect = virtio_has_feature(features, VIRTIO_NET_F_RSS);
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_queue_pairs; 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);
qatomic_set(&n->failover_primary_hidden, false);
failover_add_primary(n, &err);
if (err) {
if (!qtest_enabled()) {
warn_report_err(err);
} else {
error_free(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 void virtio_net_detach_epbf_rss(VirtIONet *n);
static void virtio_net_disable_rss(VirtIONet *n)
{
if (n->rss_data.enabled) {
trace_virtio_net_rss_disable();
}
n->rss_data.enabled = false;
virtio_net_detach_epbf_rss(n);
}
static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd)
{
NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0);
if (nc == NULL || nc->info->set_steering_ebpf == NULL) {
return false;
}
return nc->info->set_steering_ebpf(nc, prog_fd);
}
static void rss_data_to_rss_config(struct VirtioNetRssData *data,
struct EBPFRSSConfig *config)
{
config->redirect = data->redirect;
config->populate_hash = data->populate_hash;
config->hash_types = data->hash_types;
config->indirections_len = data->indirections_len;
config->default_queue = data->default_queue;
}
static bool virtio_net_attach_epbf_rss(VirtIONet *n)
{
struct EBPFRSSConfig config = {};
if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
return false;
}
rss_data_to_rss_config(&n->rss_data, &config);
if (!ebpf_rss_set_all(&n->ebpf_rss, &config,
n->rss_data.indirections_table, n->rss_data.key)) {
return false;
}
if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) {
return false;
}
return true;
}
static void virtio_net_detach_epbf_rss(VirtIONet *n)
{
virtio_net_attach_ebpf_to_backend(n->nic, -1);
}
static bool virtio_net_load_ebpf(VirtIONet *n)
{
if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
/* backend does't support steering ebpf */
return false;
}
return ebpf_rss_load(&n->ebpf_rss);
}
static void virtio_net_unload_ebpf(VirtIONet *n)
{
virtio_net_attach_ebpf_to_backend(n->nic, -1);
ebpf_rss_unload(&n->ebpf_rss);
}
static uint16_t virtio_net_handle_rss(VirtIONet *n,
struct iovec *iov,
unsigned int iov_cnt,
bool do_rss)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
struct virtio_net_rss_config cfg;
size_t s, offset = 0, size_get;
uint16_t queue_pairs, i;
struct {
uint16_t us;
uint8_t b;
} QEMU_PACKED temp;
const char *err_msg = "";
uint32_t err_value = 0;
if (do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_RSS)) {
err_msg = "RSS is not negotiated";
goto error;
}
if (!do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
err_msg = "Hash report is not negotiated";
goto error;
}
size_get = offsetof(struct virtio_net_rss_config, indirection_table);
s = iov_to_buf(iov, iov_cnt, offset, &cfg, size_get);
if (s != size_get) {
err_msg = "Short command buffer";
err_value = (uint32_t)s;
goto error;
}
n->rss_data.hash_types = virtio_ldl_p(vdev, &cfg.hash_types);
n->rss_data.indirections_len =
virtio_lduw_p(vdev, &cfg.indirection_table_mask);
n->rss_data.indirections_len++;
if (!do_rss) {
n->rss_data.indirections_len = 1;
}
if (!is_power_of_2(n->rss_data.indirections_len)) {
err_msg = "Invalid size of indirection table";
err_value = n->rss_data.indirections_len;
goto error;
}
if (n->rss_data.indirections_len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
err_msg = "Too large indirection table";
err_value = n->rss_data.indirections_len;
goto error;
}
n->rss_data.default_queue = do_rss ?
virtio_lduw_p(vdev, &cfg.unclassified_queue) : 0;
if (n->rss_data.default_queue >= n->max_queue_pairs) {
err_msg = "Invalid default queue";
err_value = n->rss_data.default_queue;
goto error;
}
offset += size_get;
size_get = sizeof(uint16_t) * n->rss_data.indirections_len;
g_free(n->rss_data.indirections_table);
n->rss_data.indirections_table = g_malloc(size_get);
if (!n->rss_data.indirections_table) {
err_msg = "Can't allocate indirections table";
err_value = n->rss_data.indirections_len;
goto error;
}
s = iov_to_buf(iov, iov_cnt, offset,
n->rss_data.indirections_table, size_get);
if (s != size_get) {
err_msg = "Short indirection table buffer";
err_value = (uint32_t)s;
goto error;
}
for (i = 0; i < n->rss_data.indirections_len; ++i) {
uint16_t val = n->rss_data.indirections_table[i];
n->rss_data.indirections_table[i] = virtio_lduw_p(vdev, &val);
}
offset += size_get;
size_get = sizeof(temp);
s = iov_to_buf(iov, iov_cnt, offset, &temp, size_get);
if (s != size_get) {
err_msg = "Can't get queue_pairs";
err_value = (uint32_t)s;
goto error;
}
queue_pairs = do_rss ? virtio_lduw_p(vdev, &temp.us) : n->curr_queue_pairs;
if (queue_pairs == 0 || queue_pairs > n->max_queue_pairs) {
err_msg = "Invalid number of queue_pairs";
err_value = queue_pairs;
goto error;
}
if (temp.b > VIRTIO_NET_RSS_MAX_KEY_SIZE) {
err_msg = "Invalid key size";
err_value = temp.b;
goto error;
}
if (!temp.b && n->rss_data.hash_types) {
err_msg = "No key provided";
err_value = 0;
goto error;
}
if (!temp.b && !n->rss_data.hash_types) {
virtio_net_disable_rss(n);
return queue_pairs;
}
offset += size_get;
size_get = temp.b;
s = iov_to_buf(iov, iov_cnt, offset, n->rss_data.key, size_get);
if (s != size_get) {
err_msg = "Can get key buffer";
err_value = (uint32_t)s;
goto error;
}
n->rss_data.enabled = true;
if (!n->rss_data.populate_hash) {
if (!virtio_net_attach_epbf_rss(n)) {
/* EBPF must be loaded for vhost */
if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
warn_report("Can't load eBPF RSS for vhost");
goto error;
}
/* fallback to software RSS */
warn_report("Can't load eBPF RSS - fallback to software RSS");
n->rss_data.enabled_software_rss = true;
}
} else {
/* use software RSS for hash populating */
/* and detach eBPF if was loaded before */
virtio_net_detach_epbf_rss(n);
n->rss_data.enabled_software_rss = true;
}
trace_virtio_net_rss_enable(n->rss_data.hash_types,
n->rss_data.indirections_len,
temp.b);
return queue_pairs;
error:
trace_virtio_net_rss_error(err_msg, err_value);
virtio_net_disable_rss(n);
return 0;
}
static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
struct iovec *iov, unsigned int iov_cnt)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
uint16_t queue_pairs;
virtio_net_disable_rss(n);
if (cmd == VIRTIO_NET_CTRL_MQ_HASH_CONFIG) {
queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, false);
return queue_pairs ? VIRTIO_NET_OK : VIRTIO_NET_ERR;
}
if (cmd == VIRTIO_NET_CTRL_MQ_RSS_CONFIG) {
queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, true);
} else if (cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
struct virtio_net_ctrl_mq mq;
size_t s;
if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ)) {
return VIRTIO_NET_ERR;
}
s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
if (s != sizeof(mq)) {
return VIRTIO_NET_ERR;
}
queue_pairs = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
} else {
return VIRTIO_NET_ERR;
}
if (queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
queue_pairs > n->max_queue_pairs ||
!n->multiqueue) {
return VIRTIO_NET_ERR;
}
n->curr_queue_pairs = queue_pairs;
/* stop the backend before changing the number of queue_pairs to avoid handling a
* disabled queue */
virtio_net_set_status(vdev, vdev->status);
virtio_net_set_queue_pairs(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_queue_pairs) {
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, CSUM_UDP);
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 uint8_t virtio_net_get_hash_type(bool isip4,
bool isip6,
bool isudp,
bool istcp,
uint32_t types)
{
if (isip4) {
if (istcp && (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4)) {
return NetPktRssIpV4Tcp;
}
if (isudp && (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4)) {
return NetPktRssIpV4Udp;
}
if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
return NetPktRssIpV4;
}
} else if (isip6) {
uint32_t mask = VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
VIRTIO_NET_RSS_HASH_TYPE_TCPv6;
if (istcp && (types & mask)) {
return (types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) ?
NetPktRssIpV6TcpEx : NetPktRssIpV6Tcp;
}
mask = VIRTIO_NET_RSS_HASH_TYPE_UDP_EX | VIRTIO_NET_RSS_HASH_TYPE_UDPv6;
if (isudp && (types & mask)) {
return (types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) ?
NetPktRssIpV6UdpEx : NetPktRssIpV6Udp;
}
mask = VIRTIO_NET_RSS_HASH_TYPE_IP_EX | VIRTIO_NET_RSS_HASH_TYPE_IPv6;
if (types & mask) {
return (types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) ?
NetPktRssIpV6Ex : NetPktRssIpV6;
}
}
return 0xff;
}
static void virtio_set_packet_hash(const uint8_t *buf, uint8_t report,
uint32_t hash)
{
struct virtio_net_hdr_v1_hash *hdr = (void *)buf;
hdr->hash_value = hash;
hdr->hash_report = report;
}
static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf,
size_t size)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
unsigned int index = nc->queue_index, new_index = index;
struct NetRxPkt *pkt = n->rx_pkt;
uint8_t net_hash_type;
uint32_t hash;
bool isip4, isip6, isudp, istcp;
static const uint8_t reports[NetPktRssIpV6UdpEx + 1] = {
VIRTIO_NET_HASH_REPORT_IPv4,
VIRTIO_NET_HASH_REPORT_TCPv4,
VIRTIO_NET_HASH_REPORT_TCPv6,
VIRTIO_NET_HASH_REPORT_IPv6,
VIRTIO_NET_HASH_REPORT_IPv6_EX,
VIRTIO_NET_HASH_REPORT_TCPv6_EX,
VIRTIO_NET_HASH_REPORT_UDPv4,
VIRTIO_NET_HASH_REPORT_UDPv6,
VIRTIO_NET_HASH_REPORT_UDPv6_EX
};
net_rx_pkt_set_protocols(pkt, buf + n->host_hdr_len,
size - n->host_hdr_len);
net_rx_pkt_get_protocols(pkt, &isip4, &isip6, &isudp, &istcp);
if (isip4 && (net_rx_pkt_get_ip4_info(pkt)->fragment)) {
istcp = isudp = false;
}
if (isip6 && (net_rx_pkt_get_ip6_info(pkt)->fragment)) {
istcp = isudp = false;
}
net_hash_type = virtio_net_get_hash_type(isip4, isip6, isudp, istcp,
n->rss_data.hash_types);
if (net_hash_type > NetPktRssIpV6UdpEx) {
if (n->rss_data.populate_hash) {
virtio_set_packet_hash(buf, VIRTIO_NET_HASH_REPORT_NONE, 0);
}
return n->rss_data.redirect ? n->rss_data.default_queue : -1;
}
hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key);
if (n->rss_data.populate_hash) {
virtio_set_packet_hash(buf, reports[net_hash_type], hash);
}
if (n->rss_data.redirect) {
new_index = hash & (n->rss_data.indirections_len - 1);
new_index = n->rss_data.indirections_table[new_index];
}
return (index == new_index) ? -1 : new_index;
}
static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
size_t size, bool no_rss)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
VirtQueueElement *elems[VIRTQUEUE_MAX_SIZE];
size_t lens[VIRTQUEUE_MAX_SIZE];
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
struct virtio_net_hdr_mrg_rxbuf mhdr;
unsigned mhdr_cnt = 0;
size_t offset, i, guest_offset, j;
ssize_t err;
if (!virtio_net_can_receive(nc)) {
return -1;
}
if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
int index = virtio_net_process_rss(nc, buf, size);
if (index >= 0) {
NetClientState *nc2 = qemu_get_subqueue(n->nic, index);
return virtio_net_receive_rcu(nc2, buf, size, true);
}
}
/* 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;
if (i == VIRTQUEUE_MAX_SIZE) {
virtio_error(vdev, "virtio-net unexpected long buffer chain");
err = size;
goto err;
}
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);
}
err = -1;
goto err;
}
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);
err = -1;
goto err;
}
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);
if (n->rss_data.populate_hash) {
offset = sizeof(mhdr);
iov_from_buf(sg, elem->in_num, offset,
buf + offset, n->host_hdr_len - sizeof(mhdr));
}
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);
err = size;
goto err;
}
elems[i] = elem;
lens[i] = total;
i++;
}
if (mhdr_cnt) {
virtio_stw_p(vdev, &mhdr.num_buffers, i);
iov_from_buf(mhdr_sg, mhdr_cnt,
0,
&mhdr.num_buffers, sizeof mhdr.num_buffers);
}
for (j = 0; j < i; j++) {
/* signal other side */
virtqueue_fill(q->rx_vq, elems[j], lens[j], j);
g_free(elems[j]);
}
virtqueue_flush(q->rx_vq, i);
virtio_notify(vdev, q->rx_vq);
return size;
err:
for (j = 0; j < i; j++) {
virtqueue_detach_element(q->rx_vq, elems[j], lens[j]);
g_free(elems[j]);
}
return err;
}
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, false);
}
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_v1 *h;
h = (struct virtio_net_hdr_v1 *)seg->buf;
h->flags = 0;
h->gso_type = VIRTIO_NET_HDR_GSO_NONE;
if (seg->is_coalesced) {
h->rsc.segments = seg->packets;
h->rsc.dup_acks = 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_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_new(VirtioNetRscSeg, 1);
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;
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_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_queue_pairs(VirtIONet *n, int new_max_queue_pairs)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
int old_num_queues = virtio_get_num_queues(vdev);
int new_num_queues = new_max_queue_pairs * 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_queue_pairs : 1;
n->multiqueue = multiqueue;
virtio_net_change_num_queue_pairs(n, max);
virtio_net_set_queue_pairs(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),