From: Peter Maydell <peter.maydell@linaro.org>
Date: Fri, 20 May 2011 15:50:01 +0000 (+0100)
Subject: net: Warn about "-net nic" options which were ignored
X-Git-Tag: v0.15.0-rc0~148
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=48e2faf222cbf4abab7c8e4b3f44229ec98eae7f;p=qemu.git

net: Warn about "-net nic" options which were ignored

Diagnose the case where the user asked for a NIC via "-net nic"
but the board didn't instantiate that NIC (for example where the
user asked for two NICs but the board only supports one). Note
that this diagnostic doesn't apply to NICs created through -device,
because those are always instantiated.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---

diff --git a/hw/qdev.c b/hw/qdev.c
index 9519f5dd5..298790198 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -468,6 +468,7 @@ void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
         qdev_prop_exists(dev, "vectors")) {
         qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
     }
+    nd->instantiated = 1;
 }
 
 BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
diff --git a/net.c b/net.c
index 68c284062..a104976b0 100644
--- a/net.c
+++ b/net.c
@@ -1304,6 +1304,7 @@ void net_check_clients(void)
 {
     VLANState *vlan;
     VLANClientState *vc;
+    int i;
 
     /* Don't warn about the default network setup that you get if
      * no command line -net or -netdev options are specified. There
@@ -1348,6 +1349,20 @@ void net_check_clients(void)
                     vc->name);
         }
     }
+
+    /* Check that all NICs requested via -net nic actually got created.
+     * NICs created via -device don't need to be checked here because
+     * they are always instantiated.
+     */
+    for (i = 0; i < MAX_NICS; i++) {
+        NICInfo *nd = &nd_table[i];
+        if (nd->used && !nd->instantiated) {
+            fprintf(stderr, "Warning: requested NIC (%s, model %s) "
+                    "was not created (not supported by this machine?)\n",
+                    nd->name ? nd->name : "anonymous",
+                    nd->model ? nd->model : "unspecified");
+        }
+    }
 }
 
 static int net_init_client(QemuOpts *opts, void *dummy)
diff --git a/net.h b/net.h
index 6ceca50fc..5b883a96b 100644
--- a/net.h
+++ b/net.h
@@ -133,7 +133,8 @@ struct NICInfo {
     char *devaddr;
     VLANState *vlan;
     VLANClientState *netdev;
-    int used;
+    int used;         /* is this slot in nd_table[] being used? */
+    int instantiated; /* does this NICInfo correspond to an instantiated NIC? */
     int nvectors;
 };