To support multiqueue virtio-net, the first step is to separate the virtqueue
related fields from VirtIONet to a new structure VirtIONetQueue. The following
patches will add an array of VirtIONetQueue to VirtIONet based on this patch.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
hw/virtio-net.c | 209 ++++++++++++++++++++++++++++++++-----------------------
1 files changed, 121 insertions(+), 88 deletions(-)
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 70bc0e6..c6f0915 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -26,28 +26,34 @@
#define MAC_TABLE_ENTRIES 64
#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
+typedef struct VirtIONetQueue {
+ VirtQueue *rx_vq;
+ VirtQueue *tx_vq;
+ QEMUTimer *tx_timer;
+ QEMUBH *tx_bh;
+ int tx_waiting;
+ struct {
+ VirtQueueElement elem;
+ ssize_t len;
+ } async_tx;
+ struct VirtIONet *n;
+ uint8_t vhost_started;
+} VirtIONetQueue;
+
typedef struct VirtIONet
{
VirtIODevice vdev;
uint8_t mac[ETH_ALEN];
uint16_t status;
- VirtQueue *rx_vq;
- VirtQueue *tx_vq;
+ VirtIONetQueue vq;
VirtQueue *ctrl_vq;
NICState *nic;
- QEMUTimer *tx_timer;
- QEMUBH *tx_bh;
uint32_t tx_timeout;
int32_t tx_burst;
- int tx_waiting;
uint32_t has_vnet_hdr;
size_t host_hdr_len;
size_t guest_hdr_len;
uint8_t has_ufo;
- struct {
- VirtQueueElement elem;
- ssize_t len;
- } async_tx;
int mergeable_rx_bufs;
uint8_t promisc;
uint8_t allmulti;
@@ -55,7 +61,6 @@ typedef struct VirtIONet
uint8_t nomulti;
uint8_t nouni;
uint8_t nobcast;
- uint8_t vhost_started;
struct {
int in_use;
int first_multi;
@@ -67,6 +72,12 @@ typedef struct VirtIONet
DeviceState *qdev;
} VirtIONet;
+static VirtIONetQueue *virtio_net_get_queue(NetClientState *nc)
+{
+ VirtIONet *n = qemu_get_nic_opaque(nc);
+
+ return &n->vq;
+}
/* TODO
* - we could suppress RX interrupt if we were so inclined.
*/
@@ -107,6 +118,8 @@ static bool virtio_net_started(VirtIONet *n, uint8_t status)
static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
{
+ VirtIONetQueue *q = &n->vq;
+
if (!qemu_get_queue(n->nic)->peer) {
return;
}
@@ -117,11 +130,11 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
if (!tap_get_vhost_net(qemu_get_queue(n->nic)->peer)) {
return;
}
- if (!!n->vhost_started == virtio_net_started(n, status) &&
+ if (!!q->vhost_started == virtio_net_started(n, status) &&
!qemu_get_queue(n->nic)->peer->link_down) {
return;
}
- if (!n->vhost_started) {
+ if (!q->vhost_started) {
int r;
if (!vhost_net_query(tap_get_vhost_net(qemu_get_queue(n->nic)->peer), &n->vdev)) {
return;
@@ -132,36 +145,37 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
error_report("unable to start vhost net: %d: "
"falling back on userspace virtio", -r);
} else {
- n->vhost_started = 1;
+ q->vhost_started = 1;
}
} else {
vhost_net_stop(tap_get_vhost_net(qemu_get_queue(n->nic)->peer), &n->vdev);
- n->vhost_started = 0;
+ q->vhost_started = 0;
}
}
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
{
VirtIONet *n = to_virtio_net(vdev);
+ VirtIONetQueue *q = &n->vq;
virtio_net_vhost_status(n, status);
- if (!n->tx_waiting) {
+ if (!q->tx_waiting) {
return;
}
- if (virtio_net_started(n, status) && !n->vhost_started) {
- if (n->tx_timer) {
- qemu_mod_timer(n->tx_timer,
+ if (virtio_net_started(n, status) && !q->vhost_started) {
+ if (q->tx_timer) {
+ qemu_mod_timer(q->tx_timer,
qemu_get_clock_ns(vm_clock) + n->tx_timeout);
} else {
- qemu_bh_schedule(n->tx_bh);
+ qemu_bh_schedule(q->tx_bh);
}
} else {
- if (n->tx_timer) {
- qemu_del_timer(n->tx_timer);
+ if (q->tx_timer) {
+ qemu_del_timer(q->tx_timer);
} else {
- qemu_bh_cancel(n->tx_bh);
+ qemu_bh_cancel(q->tx_bh);
}
}
}
@@ -470,35 +484,40 @@ static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
static int virtio_net_can_receive(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIONetQueue *q = virtio_net_get_queue(nc);
+
if (!n->vdev.vm_running) {
return 0;
}
- if (!virtio_queue_ready(n->rx_vq) ||
- !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
+ if (!virtio_queue_ready(q->rx_vq) ||
+ !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return 0;
+ }
return 1;
}
-static int virtio_net_has_buffers(VirtIONet *n, int bufsize)
+static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
{
- if (virtio_queue_empty(n->rx_vq) ||
+ VirtIONet *n = q->n;
+ if (virtio_queue_empty(q->rx_vq) ||
(n->mergeable_rx_bufs &&
- !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
- virtio_queue_set_notification(n->rx_vq, 1);
+ !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(n->rx_vq) ||
+ if (virtio_queue_empty(q->rx_vq) ||
(n->mergeable_rx_bufs &&
- !virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
+ !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
return 0;
+ }
}
- virtio_queue_set_notification(n->rx_vq, 0);
+ virtio_queue_set_notification(q->rx_vq, 0);
return 1;
}
@@ -601,6 +620,7 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
+ VirtIONetQueue *q = virtio_net_get_queue(nc);
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
struct virtio_net_hdr_mrg_rxbuf mhdr;
unsigned mhdr_cnt = 0;
@@ -610,8 +630,9 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
return -1;
/* hdr_len refers to the header we supply to the guest */
- if (!virtio_net_has_buffers(n, size + n->guest_hdr_len - n->host_hdr_len))
+ 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;
@@ -625,7 +646,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
total = 0;
- if (virtqueue_pop(n->rx_vq, &elem) == 0) {
+ if (virtqueue_pop(q->rx_vq, &elem) == 0) {
if (i == 0)
return -1;
error_report("virtio-net unexpected empty queue: "
@@ -678,7 +699,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
}
/* signal other side */
- virtqueue_fill(n->rx_vq, &elem, total, i++);
+ virtqueue_fill(q->rx_vq, &elem, total, i++);
}
if (mhdr_cnt) {
@@ -688,30 +709,32 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
&mhdr.num_buffers, sizeof mhdr.num_buffers);
}
- virtqueue_flush(n->rx_vq, i);
- virtio_notify(&n->vdev, n->rx_vq);
+ virtqueue_flush(q->rx_vq, i);
+ virtio_notify(&n->vdev, q->rx_vq);
return size;
}
-static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
+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_queue(nc);
- virtqueue_push(n->tx_vq, &n->async_tx.elem, 0);
- virtio_notify(&n->vdev, n->tx_vq);
+ virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
+ virtio_notify(&n->vdev, q->tx_vq);
- n->async_tx.elem.out_num = n->async_tx.len = 0;
+ q->async_tx.elem.out_num = q->async_tx.len = 0;
- virtio_queue_set_notification(n->tx_vq, 1);
- virtio_net_flush_tx(n, n->tx_vq);
+ virtio_queue_set_notification(q->tx_vq, 1);
+ virtio_net_flush_tx(q);
}
/* TX */
-static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
+static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
{
+ VirtIONet *n = q->n;
VirtQueueElement elem;
int32_t num_packets = 0;
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
@@ -720,12 +743,12 @@ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
assert(n->vdev.vm_running);
- if (n->async_tx.elem.out_num) {
- virtio_queue_set_notification(n->tx_vq, 0);
+ if (q->async_tx.elem.out_num) {
+ virtio_queue_set_notification(q->tx_vq, 0);
return num_packets;
}
- while (virtqueue_pop(vq, &elem)) {
+ while (virtqueue_pop(q->tx_vq, &elem)) {
ssize_t ret, len;
unsigned int out_num = elem.out_num;
struct iovec *out_sg = &elem.out_sg[0];
@@ -758,16 +781,16 @@ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
ret = qemu_sendv_packet_async(qemu_get_queue(n->nic), out_sg, out_num,
virtio_net_tx_complete);
if (ret == 0) {
- virtio_queue_set_notification(n->tx_vq, 0);
- n->async_tx.elem = elem;
- n->async_tx.len = len;
+ virtio_queue_set_notification(q->tx_vq, 0);
+ q->async_tx.elem = elem;
+ q->async_tx.len = len;
return -EBUSY;
}
len += ret;
- virtqueue_push(vq, &elem, 0);
- virtio_notify(&n->vdev, vq);
+ virtqueue_push(q->tx_vq, &elem, 0);
+ virtio_notify(&n->vdev, q->tx_vq);
if (++num_packets >= n->tx_burst) {
break;
@@ -779,22 +802,23 @@ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = to_virtio_net(vdev);
+ VirtIONetQueue *q = &n->vq;
/* This happens when device was stopped but VCPU wasn't. */
if (!n->vdev.vm_running) {
- n->tx_waiting = 1;
+ q->tx_waiting = 1;
return;
}
- if (n->tx_waiting) {
+ if (q->tx_waiting) {
virtio_queue_set_notification(vq, 1);
- qemu_del_timer(n->tx_timer);
- n->tx_waiting = 0;
- virtio_net_flush_tx(n, vq);
+ qemu_del_timer(q->tx_timer);
+ q->tx_waiting = 0;
+ virtio_net_flush_tx(q);
} else {
- qemu_mod_timer(n->tx_timer,
+ qemu_mod_timer(q->tx_timer,
qemu_get_clock_ns(vm_clock) + n->tx_timeout);
- n->tx_waiting = 1;
+ q->tx_waiting = 1;
virtio_queue_set_notification(vq, 0);
}
}
@@ -802,48 +826,51 @@ static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = to_virtio_net(vdev);
+ VirtIONetQueue *q = &n->vq;
- if (unlikely(n->tx_waiting)) {
+ if (unlikely(q->tx_waiting)) {
return;
}
- n->tx_waiting = 1;
+ q->tx_waiting = 1;
/* This happens when device was stopped but VCPU wasn't. */
if (!n->vdev.vm_running) {
return;
}
virtio_queue_set_notification(vq, 0);
- qemu_bh_schedule(n->tx_bh);
+ qemu_bh_schedule(q->tx_bh);
}
static void virtio_net_tx_timer(void *opaque)
{
- VirtIONet *n = opaque;
+ VirtIONetQueue *q = opaque;
+ VirtIONet *n = q->n;
assert(n->vdev.vm_running);
- n->tx_waiting = 0;
+ q->tx_waiting = 0;
/* Just in case the driver is not ready on more */
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
return;
- virtio_queue_set_notification(n->tx_vq, 1);
- virtio_net_flush_tx(n, n->tx_vq);
+ virtio_queue_set_notification(q->tx_vq, 1);
+ virtio_net_flush_tx(q);
}
static void virtio_net_tx_bh(void *opaque)
{
- VirtIONet *n = opaque;
+ VirtIONetQueue *q = opaque;
+ VirtIONet *n = q->n;
int32_t ret;
assert(n->vdev.vm_running);
- n->tx_waiting = 0;
+ q->tx_waiting = 0;
/* Just in case the driver is not ready on more */
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
return;
- ret = virtio_net_flush_tx(n, n->tx_vq);
+ ret = virtio_net_flush_tx(q);
if (ret == -EBUSY) {
return; /* Notification re-enable handled by tx_complete */
}
@@ -851,33 +878,34 @@ static void virtio_net_tx_bh(void *opaque)
/* If we flush a full burst of packets, assume there are
* more coming and immediately reschedule */
if (ret >= n->tx_burst) {
- qemu_bh_schedule(n->tx_bh);
- n->tx_waiting = 1;
+ 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(n->tx_vq, 1);
- if (virtio_net_flush_tx(n, n->tx_vq) > 0) {
- virtio_queue_set_notification(n->tx_vq, 0);
- qemu_bh_schedule(n->tx_bh);
- n->tx_waiting = 1;
+ virtio_queue_set_notification(q->tx_vq, 1);
+ if (virtio_net_flush_tx(q) > 0) {
+ virtio_queue_set_notification(q->tx_vq, 0);
+ qemu_bh_schedule(q->tx_bh);
+ q->tx_waiting = 1;
}
}
static void virtio_net_save(QEMUFile *f, void *opaque)
{
VirtIONet *n = opaque;
+ VirtIONetQueue *q = &n->vq;
/* At this point, backend must be stopped, otherwise
* it might keep writing to memory. */
- assert(!n->vhost_started);
+ assert(!q->vhost_started);
virtio_save(&n->vdev, f);
qemu_put_buffer(f, n->mac, ETH_ALEN);
- qemu_put_be32(f, n->tx_waiting);
+ qemu_put_be32(f, q->tx_waiting);
qemu_put_be32(f, n->mergeable_rx_bufs);
qemu_put_be16(f, n->status);
qemu_put_byte(f, n->promisc);
@@ -898,6 +926,7 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIONet *n = opaque;
+ VirtIONetQueue *q = &n->vq;
int i;
int ret;
@@ -910,7 +939,7 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
}
qemu_get_buffer(f, n->mac, ETH_ALEN);
- n->tx_waiting = qemu_get_be32(f);
+ q->tx_waiting = qemu_get_be32(f);
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));
@@ -1027,7 +1056,8 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
n->vdev.bad_features = virtio_net_bad_features;
n->vdev.reset = virtio_net_reset;
n->vdev.set_status = virtio_net_set_status;
- n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
+ n->vq.rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
+ n->vq.n = n;
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) {
error_report("virtio-net: "
@@ -1037,12 +1067,14 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
}
if (net->tx && !strcmp(net->tx, "timer")) {
- n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer);
- n->tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, n);
+ n->vq.tx_vq = virtio_add_queue(&n->vdev, 256,
+ virtio_net_handle_tx_timer);
+ n->vq.tx_timer = qemu_new_timer_ns(vm_clock,
+ virtio_net_tx_timer, &n->vq);
n->tx_timeout = net->txtimer;
} else {
- n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
- n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n);
+ n->vq.tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
+ n->vq.tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vq);
}
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
qemu_macaddr_default_if_unset(&conf->macaddr);
@@ -1060,7 +1092,7 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
qemu_format_nic_info_str(qemu_get_queue(n->nic), conf->macaddr.a);
- n->tx_waiting = 0;
+ n->vq.tx_waiting = 0;
n->tx_burst = net->txburst;
virtio_net_set_mrg_rx_bufs(n, 0);
n->promisc = 1; /* for compatibility */
@@ -1081,6 +1113,7 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
void virtio_net_exit(VirtIODevice *vdev)
{
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev);
+ VirtIONetQueue *q = &n->vq;
/* This will stop vhost backend if appropriate. */
virtio_net_set_status(vdev, 0);
@@ -1092,11 +1125,11 @@ void virtio_net_exit(VirtIODevice *vdev)
g_free(n->mac_table.macs);
g_free(n->vlans);
- if (n->tx_timer) {
- qemu_del_timer(n->tx_timer);
- qemu_free_timer(n->tx_timer);
+ if (q->tx_timer) {
+ qemu_del_timer(q->tx_timer);
+ qemu_free_timer(q->tx_timer);
} else {
- qemu_bh_delete(n->tx_bh);
+ qemu_bh_delete(q->tx_bh);
}
qemu_del_nic(n->nic);
--
1.7.1
--
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