wireless: add Wireless statistics

Signed-off-by: chao.an <anchao@xiaomi.com>

include/nuttx/wireless/wireless.h

@@ -401,7 +401,6 @@
 
 /* TODO:
  *
- * - Add types for statistics (struct iw_statistics and related)
  * - Add struct iw_range for use with IOCTL commands that need exchange mode data
  *   that could not fit in iwreq.
  * - Private IOCTL data support (struct iw_priv_arg)
@@ -459,6 +458,31 @@ struct iw_quality
   uint8_t   updated;        /* Flags to know if updated */
 };
 
+/* Packet discarded in the wireless adapter due to
+ * "wireless" specific problems...
+ * Note : the list of counter and statistics in net_device_stats
+ * is already pretty exhaustive, and you should use that first.
+ * This is only additional stats...
+ */
+
+struct iw_discarded
+{
+  uint32_t nwid;      /* Rx : Wrong nwid/essid */
+  uint32_t code;      /* Rx : Unable to code/decode (WEP) */
+  uint32_t fragment;  /* Rx : Can't perform MAC reassembly */
+  uint32_t retries;   /* Tx : Max MAC retries num reached */
+  uint32_t misc;      /* Others cases */
+};
+
+/* Packet/Time period missed in the wireless adapter due to
+ * "wireless" specific problems...
+ */
+
+struct iw_missed
+{
+  uint32_t beacon;    /* Missed beacons/superframe */
+};
+
 /* This union defines the data payload of an ioctl, and is used in struct iwreq
  * below.
  */
@@ -580,6 +604,21 @@ struct  iw_scan_req
   struct iw_freq  channel_list[IW_MAX_FREQUENCIES];
 };
 
+/* Wireless statistics */
+
+struct iw_statistics
+{
+  uint16_t status;              /* Status
+                                 * - device dependent for now
+                                 */
+
+  struct iw_quality qual;       /* Quality of the link
+                                 * (instant/mean/max)
+                                 */
+  struct iw_discarded discard;  /* Packet discarded counts */
+  struct iw_missed miss;        /* Packet missed counts */
+};
+
 /* A Wireless Event. Contains basically the same data as the ioctl...
  */