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[RFC 02/10] virtio: Add set_vq_handler
From: |
Eugenio Pérez |
Subject: |
[RFC 02/10] virtio: Add set_vq_handler |
Date: |
Fri, 29 Jan 2021 21:54:07 +0100 |
So other subsystem can override vq handler and device can reset it.
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
include/hw/virtio/virtio.h | 5 +++++
hw/net/virtio-net.c | 26 ++++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 9b5479e256..9988c6d5c9 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -149,6 +149,11 @@ struct VirtioDeviceClass {
void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
int (*start_ioeventfd)(VirtIODevice *vdev);
void (*stop_ioeventfd)(VirtIODevice *vdev);
+ /*
+ * Set handler for a vq. NULL handler for reset to default.
+ */
+ bool (*set_vq_handler)(VirtIODevice *vdev, unsigned int n,
+ VirtIOHandleOutput handle_output);
/* Saving and loading of a device; trying to deprecate save/load
* use vmsd for new devices.
*/
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 5150f295e8..f7b2998fb1 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -2699,6 +2699,31 @@ static void virtio_net_set_multiqueue(VirtIONet *n, int
multiqueue)
virtio_net_set_queues(n);
}
+static bool virtio_net_set_vq_handler(VirtIODevice *vdev, unsigned int i,
+ VirtIOHandleOutput handle_output)
+{
+ const VirtIONet *n = VIRTIO_NET(vdev);
+ const unsigned max_queues = n->multiqueue ? n->max_queues : 1;
+ VirtQueue *vq;
+
+ /* Reset control queue also not supported */
+ assert(i < max_queues * 2);
+
+ vq = virtio_get_queue(vdev, i);
+ if (handle_output == NULL) {
+ if (i % 2) {
+ handle_output = virtio_net_handle_rx;
+ } else {
+ const VirtIONetQueue *q = &n->vqs[i / 2];
+ handle_output = q->tx_timer ? virtio_net_handle_tx_timer
+ : virtio_net_handle_tx_bh;
+ }
+ }
+
+ virtqueue_set_handler(vq, handle_output);
+ return true;
+}
+
static int virtio_net_post_load_device(void *opaque, int version_id)
{
VirtIONet *n = opaque;
@@ -3519,6 +3544,7 @@ static void virtio_net_class_init(ObjectClass *klass,
void *data)
vdc->set_status = virtio_net_set_status;
vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
+ vdc->set_vq_handler = virtio_net_set_vq_handler;
vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
vdc->post_load = virtio_net_post_load_virtio;
vdc->vmsd = &vmstate_virtio_net_device;
--
2.27.0
- [RFC 00/10] vDPA shadow virtqueue - notifications forwarding, Eugenio Pérez, 2021/01/29
- [RFC 01/10] virtio: Add virtqueue_set_handler, Eugenio Pérez, 2021/01/29
- [RFC 02/10] virtio: Add set_vq_handler,
Eugenio Pérez <=
- [RFC 03/10] virtio: Add virtio_queue_get_idx, Eugenio Pérez, 2021/01/29
- [RFC 04/10] virtio: Add virtio_queue_host_notifier_status, Eugenio Pérez, 2021/01/29
- [RFC 05/10] vhost: Add vhost_dev_from_virtio, Eugenio Pérez, 2021/01/29
- [RFC 07/10] vhost: Add VhostShadowVirtqueue, Eugenio Pérez, 2021/01/29
- [RFC 06/10] vhost: Save masked_notifier state, Eugenio Pérez, 2021/01/29
- [RFC 08/10] vhost: Add x-vhost-enable-shadow-vq qmp, Eugenio Pérez, 2021/01/29
- [RFC 10/10] vhost: Route host->guest notification through shadow virtqueue, Eugenio Pérez, 2021/01/29
- [RFC 09/10] vhost: Route guest->host notification through shadow virtqueue, Eugenio Pérez, 2021/01/29