[PATCH v5 09/10] vdpa: Add virtio-net mac address via CVQ at start

[Eugenio Pérez]

This is needed so the destination vdpa device see the same state a the
guest set in the source.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
v5:
* Rename s/start/load/
* Use independent NetClientInfo to only add load callback on cvq.
---
 net/vhost-vdpa.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 8d400f2dff..d489fcd91e 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -375,10 +375,60 @@ static virtio_net_ctrl_ack 
vhost_vdpa_net_cvq_add(VhostVDPAState *s,
     return VIRTIO_NET_OK;
 }
 
+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,
+        };
+        uint8_t mac[6];
+        const struct iovec out[] = {
+            {
+                .iov_base = (void *)&ctrl,
+                .iov_len = sizeof(ctrl),
+            },{
+                .iov_base = mac,
+                .iov_len = sizeof(mac),
+            },
+        };
+        size_t out_len;
+        bool ok;
+        virtio_net_ctrl_ack state;
+
+        ok = vhost_vdpa_net_cvq_map_sg(s, out, ARRAY_SIZE(out), &out_len);
+        if (unlikely(!ok)) {
+            return -1;
+        }
+
+        memcpy(mac, n->mac, sizeof(mac));
+        state = vhost_vdpa_net_cvq_add(s, out_len);
+        vhost_vdpa_cvq_unmap_buf(v, s->cvq_cmd_out_buffer);
+        vhost_vdpa_cvq_unmap_buf(v, s->cvq_cmd_in_buffer);
+        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,
+    .load = vhost_vdpa_net_load,
     .cleanup = vhost_vdpa_cleanup,
     .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
     .has_ufo = vhost_vdpa_has_ufo,
-- 
2.31.1