opt.h loopback options cleanup

src/include/lwip/opt.h

@@ -1446,39 +1446,6 @@
 #define LWIP_NETIF_HWADDRHINT           0
 #endif
 
-/**
- * LWIP_NETIF_LOOPBACK==1: Support sending packets with a destination IP
- * address equal to the netif IP address, looping them back up the stack.
- */
-#if !defined LWIP_NETIF_LOOPBACK || defined __DOXYGEN__
-#define LWIP_NETIF_LOOPBACK             0
-#endif
-
-/**
- * LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback
- * sending for each netif (0 = disabled)
- */
-#if !defined LWIP_LOOPBACK_MAX_PBUFS || defined __DOXYGEN__
-#define LWIP_LOOPBACK_MAX_PBUFS         0
-#endif
-
-/**
- * LWIP_NETIF_LOOPBACK_MULTITHREADING: Indicates whether threading is enabled in
- * the system, as netifs must change how they behave depending on this setting
- * for the LWIP_NETIF_LOOPBACK option to work.
- * Setting this is needed to avoid reentering non-reentrant functions like
- * tcp_input().
- *    LWIP_NETIF_LOOPBACK_MULTITHREADING==1: Indicates that the user is using a
- *       multithreaded environment like tcpip.c. In this case, netif->input()
- *       is called directly.
- *    LWIP_NETIF_LOOPBACK_MULTITHREADING==0: Indicates a polling (or NO_SYS) setup.
- *       The packets are put on a list and netif_poll() must be called in
- *       the main application loop.
- */
-#if !defined LWIP_NETIF_LOOPBACK_MULTITHREADING || defined __DOXYGEN__
-#define LWIP_NETIF_LOOPBACK_MULTITHREADING    (!NO_SYS)
-#endif
-
 /**
  * LWIP_NETIF_TX_SINGLE_PBUF: if this is set to 1, lwIP tries to put all data
  * to be sent into one single pbuf. This is for compatibility with DMA-enabled
@@ -1502,7 +1469,7 @@
 */
 /**
  * @defgroup lwip_opts_loop Loopback interface
- * @ingroup lwip_opts
+ * @ingroup lwip_opts_netif
  * @{
  */
 /**
@@ -1520,6 +1487,39 @@
 #if !defined LWIP_LOOPIF_MULTICAST || defined __DOXYGEN__
 #define LWIP_LOOPIF_MULTICAST               0
 #endif
+
+/**
+ * LWIP_NETIF_LOOPBACK==1: Support sending packets with a destination IP
+ * address equal to the netif IP address, looping them back up the stack.
+ */
+#if !defined LWIP_NETIF_LOOPBACK || defined __DOXYGEN__
+#define LWIP_NETIF_LOOPBACK             0
+#endif
+
+/**
+ * LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback
+ * sending for each netif (0 = disabled)
+ */
+#if !defined LWIP_LOOPBACK_MAX_PBUFS || defined __DOXYGEN__
+#define LWIP_LOOPBACK_MAX_PBUFS         0
+#endif
+
+/**
+ * LWIP_NETIF_LOOPBACK_MULTITHREADING: Indicates whether threading is enabled in
+ * the system, as netifs must change how they behave depending on this setting
+ * for the LWIP_NETIF_LOOPBACK option to work.
+ * Setting this is needed to avoid reentering non-reentrant functions like
+ * tcp_input().
+ *    LWIP_NETIF_LOOPBACK_MULTITHREADING==1: Indicates that the user is using a
+ *       multithreaded environment like tcpip.c. In this case, netif->input()
+ *       is called directly.
+ *    LWIP_NETIF_LOOPBACK_MULTITHREADING==0: Indicates a polling (or NO_SYS) setup.
+ *       The packets are put on a list and netif_poll() must be called in
+ *       the main application loop.
+ */
+#if !defined LWIP_NETIF_LOOPBACK_MULTITHREADING || defined __DOXYGEN__
+#define LWIP_NETIF_LOOPBACK_MULTITHREADING    (!NO_SYS)
+#endif
 /**
  * @}
  */