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virtio-net: support queue_enable
Support queue_enable in vhost-kernel scenario. It can be called when a vq reset operation has been performed and the vq is restared. It should be noted that we can restart the vq when the vhost has already started. When launching a new vhost device, the vhost is not started and all vqs are not initalized until VIRTIO_PCI_COMMON_STATUS is written. Thus, we should use vhost_started to differentiate the two cases: vq reset and device start. Currently it only supports vhost-kernel. Signed-off-by: Kangjie Xu <kangjie.xu@linux.alibaba.com> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Message-Id: <20221017092558.111082-14-xuanzhuo@linux.alibaba.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -563,6 +563,26 @@ static void virtio_net_queue_reset(VirtIODevice *vdev, uint32_t queue_index)
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flush_or_purge_queued_packets(nc);
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}
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static void virtio_net_queue_enable(VirtIODevice *vdev, uint32_t queue_index)
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{
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VirtIONet *n = VIRTIO_NET(vdev);
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NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(queue_index));
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int r;
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if (!nc->peer || !vdev->vhost_started) {
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return;
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}
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if (get_vhost_net(nc->peer) &&
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nc->peer->info->type == NET_CLIENT_DRIVER_TAP) {
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r = vhost_net_virtqueue_restart(vdev, nc, queue_index);
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if (r < 0) {
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error_report("unable to restart vhost net virtqueue: %d, "
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"when resetting the queue", queue_index);
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}
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}
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}
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static void virtio_net_reset(VirtIODevice *vdev)
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{
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VirtIONet *n = VIRTIO_NET(vdev);
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@ -3845,6 +3865,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data)
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vdc->bad_features = virtio_net_bad_features;
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vdc->reset = virtio_net_reset;
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vdc->queue_reset = virtio_net_queue_reset;
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vdc->queue_enable = virtio_net_queue_enable;
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vdc->set_status = virtio_net_set_status;
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vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
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vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
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