From c5e5269d8a955a0f924218911c2f4a0b34e87a21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Tue, 23 Aug 2022 20:30:31 +0200
Subject: [PATCH] vhost_net: Add NetClientInfo stop callback
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Used by the backend to perform actions after the device is stopped.

In particular, vdpa net use it to unmap CVQ buffers to the device,
cleaning the actions performed in prepare().

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/vhost_net.c | 3 +++
 include/net/net.h  | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 2e0baeba26..9d4b334453 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -320,6 +320,9 @@ static void vhost_net_stop_one(struct vhost_net *net,
         net->nc->info->poll(net->nc, true);
     }
     vhost_dev_stop(&net->dev, dev);
+    if (net->nc->info->stop) {
+        net->nc->info->stop(net->nc);
+    }
     vhost_dev_disable_notifiers(&net->dev, dev);
 }
 
diff --git a/include/net/net.h b/include/net/net.h
index ad9e80083a..476ad45b9a 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 (NetStart)(NetClientState *);
+typedef void (NetStop)(NetClientState *);
 typedef ssize_t (NetReceive)(NetClientState *, const uint8_t *, size_t);
 typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, int);
 typedef void (NetCleanup) (NetClientState *);
@@ -73,6 +74,7 @@ typedef struct NetClientInfo {
     NetReceiveIOV *receive_iov;
     NetCanReceive *can_receive;
     NetStart *start;
+    NetStop *stop;
     NetCleanup *cleanup;
     LinkStatusChanged *link_status_changed;
     QueryRxFilter *query_rx_filter;