[PATCH v7 10/12] vhost_net: add NetClientState->load() callback

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

It allows per-net client operations right after device's successful
start. In particular, to load the device status.

Vhost-vdpa net will use it to add the CVQ buffers to restore the device
status.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
v5: Rename start / load, naming it more specifically.
---
 include/net/net.h  | 2 ++
 hw/net/vhost_net.c | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/include/net/net.h b/include/net/net.h
index 7aa1ec0974..356e682ab6 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -45,6 +45,7 @@ typedef struct NICConf {
 typedef void (NetPoll)(NetClientState *, bool enable);
 typedef bool (NetCanReceive)(NetClientState *);
 typedef int (NetPrepare)(NetClientState *);
+typedef int (NetLoad)(NetClientState *);
 typedef void (NetStop)(NetClientState *);
 typedef ssize_t (NetReceive)(NetClientState *, const uint8_t *, size_t);
 typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
@@ -74,6 +75,7 @@ typedef struct NetClientInfo {
     NetReceiveIOV *receive_iov;
     NetCanReceive *can_receive;
     NetPrepare *prepare;
+    NetLoad *load;
     NetStop *stop;
     NetCleanup *cleanup;
     LinkStatusChanged *link_status_changed;
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 10bca15446..6b83d5503f 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -281,6 +281,13 @@ static int vhost_net_start_one(struct vhost_net *net,
             }
         }
     }
+
+    if (net->nc->info->load) {
+        r = net->nc->info->load(net->nc);
+        if (r < 0) {
+            goto fail;
+        }
+    }
     return 0;
 fail:
     file.fd = -1;
-- 
2.31.1