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virtio-net: implement async packet sending

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Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Mark McLoughlin 2009-06-18 18:21:36 +01:00 committed by Anthony Liguori
parent 783527a9ef
commit 6243375f9b
1 changed files with 37 additions and 2 deletions
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39
hw/virtio-net.c
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@ -32,6 +32,10 @@ typedef struct VirtIONet
VLANClientState *vc;
QEMUTimer *tx_timer;
int tx_timer_active;
struct {
VirtQueueElement elem;
ssize_t len;
} async_tx;
int mergeable_rx_bufs;
uint8_t promisc;
uint8_t allmulti;
@ -483,6 +487,21 @@ static ssize_t virtio_net_receive(VLANClientState *vc, const uint8_t *buf, size_
return size;
}
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
static void virtio_net_tx_complete(VLANClientState *vc, ssize_t len)
{
VirtIONet *n = vc->opaque;
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len);
virtio_notify(&n->vdev, n->tx_vq);
n->async_tx.elem.out_num = n->async_tx.len = 0;
virtio_queue_set_notification(n->tx_vq, 1);
virtio_net_flush_tx(n, n->tx_vq);
}
/* TX */
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
{
@ -492,8 +511,13 @@ static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
return;
if (n->async_tx.elem.out_num) {
virtio_queue_set_notification(n->tx_vq, 0);
return;
}
while (virtqueue_pop(vq, &elem)) {
ssize_t len = 0;
ssize_t ret, len = 0;
unsigned int out_num = elem.out_num;
struct iovec *out_sg = &elem.out_sg[0];
unsigned hdr_len;
@ -520,7 +544,16 @@ static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
len += hdr_len;
}
len += qemu_sendv_packet(n->vc, out_sg, out_num);
ret = qemu_sendv_packet_async(n->vc, 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;
return;
}
len += ret;
virtqueue_push(vq, &elem, len);
virtio_notify(&n->vdev, vq);
@ -663,6 +696,8 @@ static void virtio_net_cleanup(VLANClientState *vc)
{
VirtIONet *n = vc->opaque;
qemu_purge_queued_packets(vc);
unregister_savevm("virtio-net", n);
qemu_free(n->mac_table.macs);