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virtio-net: separate virtqueue from VirtIONet
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@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jason Wang
Anthony Liguori
parent
e78a2b4285
commit
0c87e93e31
195
hw/virtio-net.c
195
hw/virtio-net.c
@ -26,28 +26,33 @@
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#define MAC_TABLE_ENTRIES 64
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#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
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typedef struct VirtIONetQueue {
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VirtQueue *rx_vq;
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VirtQueue *tx_vq;
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QEMUTimer *tx_timer;
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QEMUBH *tx_bh;
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int tx_waiting;
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struct {
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VirtQueueElement elem;
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ssize_t len;
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} async_tx;
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struct VirtIONet *n;
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} VirtIONetQueue;
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typedef struct VirtIONet
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{
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VirtIODevice vdev;
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uint8_t mac[ETH_ALEN];
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uint16_t status;
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VirtQueue *rx_vq;
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VirtQueue *tx_vq;
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VirtIONetQueue vq;
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VirtQueue *ctrl_vq;
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NICState *nic;
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QEMUTimer *tx_timer;
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QEMUBH *tx_bh;
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uint32_t tx_timeout;
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int32_t tx_burst;
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int tx_waiting;
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uint32_t has_vnet_hdr;
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size_t host_hdr_len;
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size_t guest_hdr_len;
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uint8_t has_ufo;
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struct {
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VirtQueueElement elem;
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ssize_t len;
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} async_tx;
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int mergeable_rx_bufs;
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uint8_t promisc;
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uint8_t allmulti;
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@ -67,6 +72,12 @@ typedef struct VirtIONet
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DeviceState *qdev;
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} VirtIONet;
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static VirtIONetQueue *virtio_net_get_queue(NetClientState *nc)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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return &n->vq;
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}
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/* TODO
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* - we could suppress RX interrupt if we were so inclined.
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*/
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@ -135,6 +146,8 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
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error_report("unable to start vhost net: %d: "
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"falling back on userspace virtio", -r);
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n->vhost_started = 0;
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} else {
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n->vhost_started = 1;
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}
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} else {
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vhost_net_stop(&n->vdev, nc, 1);
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@ -145,25 +158,26 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
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static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
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{
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VirtIONet *n = to_virtio_net(vdev);
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VirtIONetQueue *q = &n->vq;
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virtio_net_vhost_status(n, status);
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if (!n->tx_waiting) {
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if (!q->tx_waiting) {
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return;
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}
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if (virtio_net_started(n, status) && !n->vhost_started) {
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if (n->tx_timer) {
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qemu_mod_timer(n->tx_timer,
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if (q->tx_timer) {
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qemu_mod_timer(q->tx_timer,
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qemu_get_clock_ns(vm_clock) + n->tx_timeout);
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} else {
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qemu_bh_schedule(n->tx_bh);
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qemu_bh_schedule(q->tx_bh);
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}
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} else {
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if (n->tx_timer) {
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qemu_del_timer(n->tx_timer);
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if (q->tx_timer) {
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qemu_del_timer(q->tx_timer);
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} else {
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qemu_bh_cancel(n->tx_bh);
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qemu_bh_cancel(q->tx_bh);
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}
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}
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}
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@ -507,35 +521,40 @@ static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
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static int virtio_net_can_receive(NetClientState *nc)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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VirtIONetQueue *q = virtio_net_get_queue(nc);
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if (!n->vdev.vm_running) {
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return 0;
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}
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if (!virtio_queue_ready(n->rx_vq) ||
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
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if (!virtio_queue_ready(q->rx_vq) ||
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
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return 0;
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}
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return 1;
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}
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static int virtio_net_has_buffers(VirtIONet *n, int bufsize)
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static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
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{
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if (virtio_queue_empty(n->rx_vq) ||
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VirtIONet *n = q->n;
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if (virtio_queue_empty(q->rx_vq) ||
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(n->mergeable_rx_bufs &&
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!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
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virtio_queue_set_notification(n->rx_vq, 1);
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!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
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virtio_queue_set_notification(q->rx_vq, 1);
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/* To avoid a race condition where the guest has made some buffers
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* available after the above check but before notification was
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* enabled, check for available buffers again.
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*/
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if (virtio_queue_empty(n->rx_vq) ||
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if (virtio_queue_empty(q->rx_vq) ||
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(n->mergeable_rx_bufs &&
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!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
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!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
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return 0;
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}
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}
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virtio_queue_set_notification(n->rx_vq, 0);
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virtio_queue_set_notification(q->rx_vq, 0);
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return 1;
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}
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@ -638,6 +657,7 @@ static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
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static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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VirtIONetQueue *q = virtio_net_get_queue(nc);
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struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
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struct virtio_net_hdr_mrg_rxbuf mhdr;
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unsigned mhdr_cnt = 0;
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@ -648,8 +668,9 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
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}
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/* hdr_len refers to the header we supply to the guest */
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if (!virtio_net_has_buffers(n, size + n->guest_hdr_len - n->host_hdr_len))
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if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
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return 0;
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}
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if (!receive_filter(n, buf, size))
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return size;
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@ -663,7 +684,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
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total = 0;
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if (virtqueue_pop(n->rx_vq, &elem) == 0) {
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if (virtqueue_pop(q->rx_vq, &elem) == 0) {
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if (i == 0)
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return -1;
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error_report("virtio-net unexpected empty queue: "
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@ -716,7 +737,7 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
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}
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/* signal other side */
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virtqueue_fill(n->rx_vq, &elem, total, i++);
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virtqueue_fill(q->rx_vq, &elem, total, i++);
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}
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if (mhdr_cnt) {
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@ -726,30 +747,32 @@ static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t
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&mhdr.num_buffers, sizeof mhdr.num_buffers);
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}
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virtqueue_flush(n->rx_vq, i);
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virtio_notify(&n->vdev, n->rx_vq);
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virtqueue_flush(q->rx_vq, i);
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virtio_notify(&n->vdev, q->rx_vq);
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return size;
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}
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static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
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static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
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static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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VirtIONetQueue *q = virtio_net_get_queue(nc);
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virtqueue_push(n->tx_vq, &n->async_tx.elem, 0);
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virtio_notify(&n->vdev, n->tx_vq);
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virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
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virtio_notify(&n->vdev, q->tx_vq);
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n->async_tx.elem.out_num = n->async_tx.len = 0;
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q->async_tx.elem.out_num = q->async_tx.len = 0;
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virtio_queue_set_notification(n->tx_vq, 1);
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virtio_net_flush_tx(n, n->tx_vq);
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virtio_queue_set_notification(q->tx_vq, 1);
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virtio_net_flush_tx(q);
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}
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/* TX */
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static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
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static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
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{
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VirtIONet *n = q->n;
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VirtQueueElement elem;
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int32_t num_packets = 0;
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if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
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@ -758,12 +781,12 @@ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
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assert(n->vdev.vm_running);
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if (n->async_tx.elem.out_num) {
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virtio_queue_set_notification(n->tx_vq, 0);
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if (q->async_tx.elem.out_num) {
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virtio_queue_set_notification(q->tx_vq, 0);
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return num_packets;
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}
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while (virtqueue_pop(vq, &elem)) {
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while (virtqueue_pop(q->tx_vq, &elem)) {
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ssize_t ret, len;
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unsigned int out_num = elem.out_num;
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struct iovec *out_sg = &elem.out_sg[0];
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@ -796,16 +819,16 @@ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
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ret = qemu_sendv_packet_async(qemu_get_queue(n->nic), out_sg, out_num,
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virtio_net_tx_complete);
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if (ret == 0) {
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virtio_queue_set_notification(n->tx_vq, 0);
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n->async_tx.elem = elem;
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n->async_tx.len = len;
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virtio_queue_set_notification(q->tx_vq, 0);
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q->async_tx.elem = elem;
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q->async_tx.len = len;
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return -EBUSY;
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}
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len += ret;
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virtqueue_push(vq, &elem, 0);
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virtio_notify(&n->vdev, vq);
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virtqueue_push(q->tx_vq, &elem, 0);
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virtio_notify(&n->vdev, q->tx_vq);
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if (++num_packets >= n->tx_burst) {
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break;
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@ -817,22 +840,23 @@ static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
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static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIONet *n = to_virtio_net(vdev);
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VirtIONetQueue *q = &n->vq;
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/* This happens when device was stopped but VCPU wasn't. */
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if (!n->vdev.vm_running) {
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n->tx_waiting = 1;
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q->tx_waiting = 1;
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return;
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}
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if (n->tx_waiting) {
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if (q->tx_waiting) {
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virtio_queue_set_notification(vq, 1);
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qemu_del_timer(n->tx_timer);
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n->tx_waiting = 0;
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virtio_net_flush_tx(n, vq);
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qemu_del_timer(q->tx_timer);
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q->tx_waiting = 0;
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virtio_net_flush_tx(q);
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} else {
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qemu_mod_timer(n->tx_timer,
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qemu_mod_timer(q->tx_timer,
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qemu_get_clock_ns(vm_clock) + n->tx_timeout);
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n->tx_waiting = 1;
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q->tx_waiting = 1;
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virtio_queue_set_notification(vq, 0);
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}
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}
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@ -840,48 +864,51 @@ static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
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static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIONet *n = to_virtio_net(vdev);
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VirtIONetQueue *q = &n->vq;
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if (unlikely(n->tx_waiting)) {
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if (unlikely(q->tx_waiting)) {
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return;
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}
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n->tx_waiting = 1;
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q->tx_waiting = 1;
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/* This happens when device was stopped but VCPU wasn't. */
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if (!n->vdev.vm_running) {
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return;
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}
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virtio_queue_set_notification(vq, 0);
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qemu_bh_schedule(n->tx_bh);
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qemu_bh_schedule(q->tx_bh);
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}
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static void virtio_net_tx_timer(void *opaque)
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{
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VirtIONet *n = opaque;
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VirtIONetQueue *q = opaque;
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VirtIONet *n = q->n;
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assert(n->vdev.vm_running);
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n->tx_waiting = 0;
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q->tx_waiting = 0;
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/* Just in case the driver is not ready on more */
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if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
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return;
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virtio_queue_set_notification(n->tx_vq, 1);
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virtio_net_flush_tx(n, n->tx_vq);
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virtio_queue_set_notification(q->tx_vq, 1);
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virtio_net_flush_tx(q);
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}
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static void virtio_net_tx_bh(void *opaque)
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{
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VirtIONet *n = opaque;
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VirtIONetQueue *q = opaque;
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VirtIONet *n = q->n;
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int32_t ret;
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assert(n->vdev.vm_running);
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n->tx_waiting = 0;
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q->tx_waiting = 0;
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/* Just in case the driver is not ready on more */
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if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
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return;
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ret = virtio_net_flush_tx(n, n->tx_vq);
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ret = virtio_net_flush_tx(q);
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if (ret == -EBUSY) {
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return; /* Notification re-enable handled by tx_complete */
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}
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@ -889,25 +916,26 @@ static void virtio_net_tx_bh(void *opaque)
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/* If we flush a full burst of packets, assume there are
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* more coming and immediately reschedule */
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if (ret >= n->tx_burst) {
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qemu_bh_schedule(n->tx_bh);
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n->tx_waiting = 1;
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qemu_bh_schedule(q->tx_bh);
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q->tx_waiting = 1;
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return;
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}
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/* If less than a full burst, re-enable notification and flush
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* anything that may have come in while we weren't looking. If
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* we find something, assume the guest is still active and reschedule */
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virtio_queue_set_notification(n->tx_vq, 1);
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if (virtio_net_flush_tx(n, n->tx_vq) > 0) {
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virtio_queue_set_notification(n->tx_vq, 0);
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qemu_bh_schedule(n->tx_bh);
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n->tx_waiting = 1;
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virtio_queue_set_notification(q->tx_vq, 1);
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if (virtio_net_flush_tx(q) > 0) {
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virtio_queue_set_notification(q->tx_vq, 0);
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qemu_bh_schedule(q->tx_bh);
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q->tx_waiting = 1;
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}
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}
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static void virtio_net_save(QEMUFile *f, void *opaque)
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{
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VirtIONet *n = opaque;
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VirtIONetQueue *q = &n->vq;
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/* At this point, backend must be stopped, otherwise
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* it might keep writing to memory. */
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@ -915,7 +943,7 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
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virtio_save(&n->vdev, f);
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qemu_put_buffer(f, n->mac, ETH_ALEN);
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qemu_put_be32(f, n->tx_waiting);
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qemu_put_be32(f, q->tx_waiting);
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qemu_put_be32(f, n->mergeable_rx_bufs);
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qemu_put_be16(f, n->status);
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qemu_put_byte(f, n->promisc);
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@ -936,6 +964,7 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
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static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
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{
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VirtIONet *n = opaque;
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VirtIONetQueue *q = &n->vq;
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int i;
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int ret;
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@ -948,7 +977,7 @@ 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));
|
||||
|
||||
@ -1085,7 +1114,8 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
|
||||
n->vdev.set_status = virtio_net_set_status;
|
||||
n->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask;
|
||||
n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending;
|
||||
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: "
|
||||
@ -1095,12 +1125,14 @@ 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);
|
||||
@ -1118,7 +1150,7 @@ 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 */
|
||||
@ -1139,6 +1171,7 @@ 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);
|
||||
@ -1150,11 +1183,11 @@ 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);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user