net: introduce NICState and qemu_new_nic()

Common state for all NICs.

The opaque member will replace the opaque member in VLANClientState
since only NICs need it.

The conf member will allow us to iterate over NICs, access the MAC
addr for the NIC and send a packet from each NIC in qemu_announce_self().
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

net.c

@@ -293,6 +293,27 @@ VLANClientState *qemu_new_net_client(NetClientInfo *info,
     return vc;
 }
 
+NICState *qemu_new_nic(NetClientInfo *info,
+                       NICConf *conf,
+                       const char *model,
+                       const char *name,
+                       void *opaque)
+{
+    VLANClientState *nc;
+    NICState *nic;
+
+    assert(info->type == NET_CLIENT_TYPE_NIC);
+    assert(info->size >= sizeof(NICState));
+
+    nc = qemu_new_net_client(info, conf->vlan, conf->peer, model, name);
+
+    nic = DO_UPCAST(NICState, nc, nc);
+    nic->conf = conf;
+    nic->opaque = opaque;
+
+    return nic;
+}
+
 VLANClientState *qemu_new_vlan_client(net_client_type type,
                                       VLANState *vlan,
                                       VLANClientState *peer,

net.h

@@ -75,6 +75,12 @@ struct VLANClientState {
     unsigned receive_disabled : 1;
 };
 
+typedef struct NICState {
+    VLANClientState nc;
+    NICConf *conf;
+    void *opaque;
+} NICState;
+
 struct VLANState {
     int id;
     QTAILQ_HEAD(, VLANClientState) clients;
@@ -90,6 +96,11 @@ VLANClientState *qemu_new_net_client(NetClientInfo *info,
                                      VLANClientState *peer,
                                      const char *model,
                                      const char *name);
+NICState *qemu_new_nic(NetClientInfo *info,
+                       NICConf *conf,
+                       const char *model,
+                       const char *name,
+                       void *opaque);
 VLANClientState *qemu_new_vlan_client(net_client_type type,
                                       VLANState *vlan,
                                       VLANClientState *peer,