This is needed so the destination vdpa device see the same state a the
guest set in the source.
Signed-off-by: Eugenio Pérez <epere...@redhat.com>
---
v6:
* Map and unmap command buffers at the start and end of device usage.
v5:
* Rename s/start/load/
* Use independent NetClientInfo to only add load callback on cvq.
---
net/vhost-vdpa.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 10843e6d97..4f1524c2e9 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -363,11 +363,54 @@ static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s,
size_t out_len,
return vhost_svq_poll(svq);
}
+static int vhost_vdpa_net_load(NetClientState *nc)
+{
+ VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
+ struct vhost_vdpa *v = &s->vhost_vdpa;
+ VirtIONet *n;
+ uint64_t features;
+
+ assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
+
+ if (!v->shadow_vqs_enabled) {
+ return 0;
+ }
+
+ n = VIRTIO_NET(v->dev->vdev);
+ features = v->dev->vdev->host_features;
+ if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) {
+ const struct virtio_net_ctrl_hdr ctrl = {
+ .class = VIRTIO_NET_CTRL_MAC,
+ .cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET,
+ };
+ char *cursor = s->cvq_cmd_out_buffer;
+ ssize_t dev_written;
+ virtio_net_ctrl_ack state;
+
+ memcpy(cursor, &ctrl, sizeof(ctrl));
+ cursor += sizeof(ctrl);
+ memcpy(cursor, n->mac, sizeof(n->mac));
+ cursor += sizeof(n->mac);
+
+ dev_written = vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + sizeof(n->mac),
+ sizeof(state));
+ if (unlikely(dev_written < 0)) {
+ return dev_written;
+ }
+
+ memcpy(&state, s->cvq_cmd_in_buffer, sizeof(state));
+ return state == VIRTIO_NET_OK ? 0 : -1;
+ }
+
+ return 0;
+}
+
static NetClientInfo net_vhost_vdpa_cvq_info = {
.type = NET_CLIENT_DRIVER_VHOST_VDPA,
.size = sizeof(VhostVDPAState),
.receive = vhost_vdpa_receive,
.prepare = vhost_vdpa_net_cvq_prepare,
+ .load = vhost_vdpa_net_load,
.stop = vhost_vdpa_net_cvq_stop,
.cleanup = vhost_vdpa_cleanup,
.has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
--
2.31.1
