rocker: forbid to change world type

Port to world assignment should be permitted only by qemu user. Driver
should not be able to do it, so forbid that possibility.
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>

hw/net/rocker/rocker.c

@@ -400,7 +400,13 @@ static int cmd_set_port_settings(Rocker *r,
 
     if (tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MODE]) {
         mode = rocker_tlv_get_u8(tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_MODE]);
-        fp_port_set_world(fp_port, r->worlds[mode]);
+        if (mode >= ROCKER_WORLD_TYPE_MAX) {
+            return -ROCKER_EINVAL;
+        }
+        /* We don't support world change. */
+        if (!fp_port_check_world(fp_port, r->worlds[mode])) {
+            return -ROCKER_EINVAL;
+        }
     }
 
     if (tlvs[ROCKER_TLV_CMD_PORT_SETTINGS_LEARNING]) {

hw/net/rocker/rocker_fp.c

@@ -186,6 +186,11 @@ void fp_port_set_world(FpPort *port, World *world)
     port->world = world;
 }
 
+bool fp_port_check_world(FpPort *port, World *world)
+{
+    return port->world == world;
+}
+
 bool fp_port_enabled(FpPort *port)
 {
     return port->enabled;

hw/net/rocker/rocker_fp.h

@@ -40,6 +40,7 @@ int fp_port_set_settings(FpPort *port, uint32_t speed,
 bool fp_port_from_pport(uint32_t pport, uint32_t *port);
 World *fp_port_get_world(FpPort *port);
 void fp_port_set_world(FpPort *port, World *world);
+bool fp_port_check_world(FpPort *port, World *world);
 bool fp_port_enabled(FpPort *port);
 void fp_port_enable(FpPort *port);
 void fp_port_disable(FpPort *port);