[RFC PATCH v5 18/23] vdpa: add NetClientState->start() callback

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

It allows to inject custom code on device success start, right before
release lock.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 include/net/net.h  | 2 ++
 hw/net/vhost_net.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/include/net/net.h b/include/net/net.h
index 523136c7ac..2fc3002ab4 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -44,6 +44,7 @@ typedef struct NICConf {
 
 typedef void (NetPoll)(NetClientState *, bool enable);
 typedef bool (NetCanReceive)(NetClientState *);
+typedef void (NetStart)(NetClientState *);
 typedef ssize_t (NetReceive)(NetClientState *, const uint8_t *, size_t);
 typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
 typedef void (NetCleanup) (NetClientState *);
@@ -71,6 +72,7 @@ typedef struct NetClientInfo {
     NetReceive *receive_raw;
     NetReceiveIOV *receive_iov;
     NetCanReceive *can_receive;
+    NetStart *start;
     NetCleanup *cleanup;
     LinkStatusChanged *link_status_changed;
     QueryRxFilter *query_rx_filter;
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 30379d2ca4..44a105ec29 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -274,6 +274,10 @@ static int vhost_net_start_one(struct vhost_net *net,
             }
         }
     }
+
+    if (net->nc->info->start) {
+        net->nc->info->start(net->nc);
+    }
     return 0;
 fail:
     file.fd = -1;
-- 
2.27.0