[RFC PATCH 16/18] vdpa: add vhost_vdpa_net_load_setup NetClient callback

["Eugenio Pérez" <eperezma@redhat.com>]

So the vDPA backend knows when a migration incoming starts.  NicState
argument is needed so we can get the dma address space.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 include/net/net.h |  4 ++++
 net/vhost-vdpa.c  | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/net/net.h b/include/net/net.h
index 2fb1c9181c..e0ecf85bf6 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -42,6 +42,7 @@ typedef struct NICConf {
 
 /* Net clients */
 
+struct NICState;
 typedef void (NetPoll)(NetClientState *, bool enable);
 typedef bool (NetCanReceive)(NetClientState *);
 typedef int (NetStart)(NetClientState *);
@@ -69,6 +70,8 @@ typedef void (SocketReadStateFinalize)(SocketReadState *rs);
 typedef void (NetAnnounce)(NetClientState *);
 typedef bool (SetSteeringEBPF)(NetClientState *, int);
 typedef bool (NetCheckPeerType)(NetClientState *, ObjectClass *, Error **);
+/* This can be called before start & pair, so get also the peer */
+typedef int (NetMigrationLoadSetup)(NetClientState *, struct NICState *);
 
 typedef struct NetClientInfo {
     NetClientDriver type;
@@ -98,6 +101,7 @@ typedef struct NetClientInfo {
     NetAnnounce *announce;
     SetSteeringEBPF *set_steering_ebpf;
     NetCheckPeerType *check_peer_type;
+    NetMigrationLoadSetup *load_setup;
 } NetClientInfo;
 
 struct NetClientState {
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 31df7e91a1..507cb946d2 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -396,6 +396,15 @@ static void vhost_vdpa_net_client_stop(NetClientState *nc)
     }
 }
 
+static int vhost_vdpa_net_load_setup(NetClientState *nc, NICState *nic)
+{
+    VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
+    VirtIONet *n = qemu_get_nic_opaque(&nic->ncs[0]);
+
+    vhost_vdpa_load_setup(s->vhost_vdpa.shared, n->parent_obj.dma_as);
+    return 0;
+}
+
 static NetClientInfo net_vhost_vdpa_info = {
         .type = NET_CLIENT_DRIVER_VHOST_VDPA,
         .size = sizeof(VhostVDPAState),
@@ -407,6 +416,7 @@ static NetClientInfo net_vhost_vdpa_info = {
         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
         .has_ufo = vhost_vdpa_has_ufo,
         .check_peer_type = vhost_vdpa_check_peer_type,
+        .load_setup = vhost_vdpa_net_load_setup,
 };
 
 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index,
-- 
2.39.3