[Qemu-devel] [PATCH v3 15/28] vhost-user: keep vhost_net after a disconnection

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Lot of code path assumes get_vhost_net() return non-null. Keep it
after a successful vhost_net_init(). vhost_net_cleanup() will clear the
vhost-dev connection-related data after vhost_user_stop().

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/net/vhost_net.c |  1 -
 net/tap.c          |  1 +
 net/vhost-user.c   | 21 ++++++++-------------
 3 files changed, 9 insertions(+), 14 deletions(-)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 1da05d0..08c7d1e 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -378,7 +378,6 @@ void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
 void vhost_net_cleanup(struct vhost_net *net)
 {
     vhost_dev_cleanup(&net->dev);
-    g_free(net);
 }
 
 int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
diff --git a/net/tap.c b/net/tap.c
index 49817c7..31726e7 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -299,6 +299,7 @@ static void tap_cleanup(NetClientState *nc)
 
     if (s->vhost_net) {
         vhost_net_cleanup(s->vhost_net);
+        g_free(s->vhost_net);
         s->vhost_net = NULL;
     }
 
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 18bd170..9ad7bcc 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -45,11 +45,6 @@ uint64_t vhost_user_get_acked_features(NetClientState *nc)
     return s->acked_features;
 }
 
-static int vhost_user_running(VhostUserState *s)
-{
-    return (s->vhost_net) ? 1 : 0;
-}
-
 static void vhost_user_stop(int queues, NetClientState *ncs[])
 {
     VhostUserState *s;
@@ -59,15 +54,11 @@ static void vhost_user_stop(int queues, NetClientState *ncs[])
         assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
 
         s = DO_UPCAST(VhostUserState, nc, ncs[i]);
-        if (!vhost_user_running(s)) {
-            continue;
-        }
 
         if (s->vhost_net) {
             /* save acked features */
-            s->acked_features = vhost_net_get_acked_features(s->vhost_net);
+            s->acked_features |= vhost_net_get_acked_features(s->vhost_net);
             vhost_net_cleanup(s->vhost_net);
-            s->vhost_net = NULL;
         }
     }
 }
@@ -85,12 +76,15 @@ static int vhost_user_start(int queues, NetClientState *ncs[])
         assert (ncs[i]->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
 
         s = DO_UPCAST(VhostUserState, nc, ncs[i]);
-        if (vhost_user_running(s)) {
-            continue;
-        }
 
         options.net_backend = ncs[i];
         options.opaque      = s->chr;
+
+        if (s->vhost_net) {
+            vhost_net_cleanup(s->vhost_net);
+            g_free(s->vhost_net);
+        }
+
         s->vhost_net = vhost_net_init(&options);
         if (!s->vhost_net) {
             error_report("failed to init vhost_net for queue %d", i);
@@ -149,6 +143,7 @@ static void vhost_user_cleanup(NetClientState *nc)
 
     if (s->vhost_net) {
         vhost_net_cleanup(s->vhost_net);
+        g_free(s->vhost_net);
         s->vhost_net = NULL;
     }
     if (s->chr) {
-- 
2.9.0