[Qemu-devel] [PATCH v3 04/16] hub: Check that hubs are configured correctly

[zwu.kernel@gmail.com]

From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

Checks can be performed to make sure that hubs have at least one NIC and
one host device, warning the user if this is not the case.
Configurations which do not meet this rule tend to be broken but just
emit a warning.  This patch preserves compatibility with the checks
performed by net core on vlans.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
---
 net.c     |   25 +------------------------
 net/hub.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
 net/hub.h |    1 +
 3 files changed, 47 insertions(+), 24 deletions(-)

diff --git a/net.c b/net.c
index d9c7eac..88b9e1f 100644
--- a/net.c
+++ b/net.c
@@ -1337,7 +1337,6 @@ void net_cleanup(void)
 
 void net_check_clients(void)
 {
-    VLANState *vlan;
     VLANClientState *vc;
     int i;
 
@@ -1353,30 +1352,8 @@ void net_check_clients(void)
         return;
     }
 
-    QTAILQ_FOREACH(vlan, &vlans, next) {
-        int has_nic = 0, has_host_dev = 0;
+    net_hub_check_clients();
 
-        QTAILQ_FOREACH(vc, &vlan->clients, next) {
-            switch (vc->info->type) {
-            case NET_CLIENT_TYPE_NIC:
-                has_nic = 1;
-                break;
-            case NET_CLIENT_TYPE_USER:
-            case NET_CLIENT_TYPE_TAP:
-            case NET_CLIENT_TYPE_SOCKET:
-            case NET_CLIENT_TYPE_VDE:
-                has_host_dev = 1;
-                break;
-            default: ;
-            }
-        }
-        if (has_host_dev && !has_nic)
-            fprintf(stderr, "Warning: vlan %d with no nics\n", vlan->id);
-        if (has_nic && !has_host_dev)
-            fprintf(stderr,
-                    "Warning: vlan %d is not connected to host network\n",
-                    vlan->id);
-    }
     QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
         if (!vc->peer) {
             fprintf(stderr, "Warning: %s %s has no peer\n",
diff --git a/net/hub.c b/net/hub.c
index 3cd1249..19c1169 100644
--- a/net/hub.c
+++ b/net/hub.c
@@ -222,3 +222,48 @@ int net_hub_id_for_client(VLANClientState *nc, unsigned int *id)
     }
     return -ENOENT;
 }
+
+/**
+ * Warn if hub configurations are likely wrong
+ */
+void net_hub_check_clients(void)
+{
+    NetHub *hub;
+    NetHubPort *port;
+    VLANClientState *peer;
+
+    QLIST_FOREACH(hub, &hubs, next) {
+        int has_nic = 0, has_host_dev = 0;
+
+        QLIST_FOREACH(port, &hub->ports, next) {
+            peer = port->nc.peer;
+            if (!peer) {
+                fprintf(stderr, "Warning: hub port %s has no peer\n",
+                        port->nc.name);
+                continue;
+            }
+
+            switch (peer->info->type) {
+            case NET_CLIENT_TYPE_NIC:
+                has_nic = 1;
+                break;
+            case NET_CLIENT_TYPE_USER:
+            case NET_CLIENT_TYPE_TAP:
+            case NET_CLIENT_TYPE_SOCKET:
+            case NET_CLIENT_TYPE_VDE:
+                has_host_dev = 1;
+                break;
+            default:
+                break;
+            }
+        }
+        if (has_host_dev && !has_nic) {
+            fprintf(stderr, "Warning: vlan %u with no nics\n", hub->id);
+        }
+        if (has_nic && !has_host_dev) {
+            fprintf(stderr,
+                    "Warning: vlan %u is not connected to host network\n",
+                    hub->id);
+        }
+    }
+}
diff --git a/net/hub.h b/net/hub.h
index 60d4cae..caa3b16 100644
--- a/net/hub.h
+++ b/net/hub.h
@@ -21,5 +21,6 @@ VLANClientState *net_hub_find_client_by_name(unsigned int hub_id,
                                              const char *name);
 void net_hub_info(Monitor *mon);
 int net_hub_id_for_client(VLANClientState *nc, unsigned int *id);
+void net_hub_check_clients(void);
 
 #endif /* NET_HUB_H */
-- 
1.7.6