Add support to export the contents of the notification updates from the firmware.

Right now the NIC isn't actually exporting useful data. I'm not quite sure
why this is. :(

sys/dev/iwi/if_iwi.c

@@ -84,6 +84,7 @@ __FBSDID("$FreeBSD$");
 
 #include <dev/iwi/if_iwireg.h>
 #include <dev/iwi/if_iwivar.h>
+#include <dev/iwi/if_iwi_ioctl.h>
 
 #define IWI_DEBUG
 #ifdef IWI_DEBUG
@@ -1373,6 +1374,33 @@ iwi_checkforqos(struct ieee80211vap *vap,
 #undef SUBTYPE
 }
 
+static void
+iwi_notif_link_quality(struct iwi_softc *sc, struct iwi_notif *notif)
+{
+	struct iwi_notif_link_quality *lq;
+	int len;
+
+	len = le16toh(notif->len);
+
+	DPRINTFN(5, ("Notification (%u) - len=%d, sizeof=%d\n",
+	    notif->type,
+	    len,
+	    sizeof(struct iwi_notif_link_quality)
+	    ));
+
+	/* enforce length */
+	if (len != sizeof(struct iwi_notif_link_quality)) {
+		DPRINTFN(5, ("Notification: (%u) too short (%d)\n",
+		    notif->type,
+		    len));
+		return;
+	}
+
+	lq = (struct iwi_notif_link_quality *)(notif + 1);
+	memcpy(&sc->sc_linkqual, lq, sizeof(sc->sc_linkqual));
+	sc->sc_linkqual_valid = 1;
+}
+
 /*
  * Task queue callbacks for iwi_notification_intr used to avoid LOR's.
  */
@@ -1542,9 +1570,12 @@ iwi_notification_intr(struct iwi_softc *sc, struct iwi_notif *notif)
 
 	case IWI_NOTIF_TYPE_CALIBRATION:
 	case IWI_NOTIF_TYPE_NOISE:
-	case IWI_NOTIF_TYPE_LINK_QUALITY:
+		/* XXX handle? */
 		DPRINTFN(5, ("Notification (%u)\n", notif->type));
 		break;
+	case IWI_NOTIF_TYPE_LINK_QUALITY:
+		iwi_notif_link_quality(sc, notif);
+		break;
 
 	default:
 		DPRINTF(("unknown notification type %u flags 0x%x len %u\n",
@@ -2063,6 +2094,20 @@ iwi_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 	case SIOCGIFADDR:
 		error = ether_ioctl(ifp, cmd, data);
 		break;
+	case SIOCGIWISTATS:
+		IWI_LOCK(sc);
+		/* XXX validate permissions/memory/etc? */
+		error = copyout(&sc->sc_linkqual, ifr->ifr_data,
+		    sizeof(struct iwi_notif_link_quality));
+		IWI_UNLOCK(sc);
+		break;
+	case SIOCZIWISTATS:
+		IWI_LOCK(sc);
+		memset(&sc->sc_linkqual, 0,
+		    sizeof(struct iwi_notif_link_quality));
+		IWI_UNLOCK(sc);
+		error = 0;
+		break;
 	default:
 		error = EINVAL;
 		break;

sys/dev/iwi/if_iwi_ioctl.h

@@ -0,0 +1,25 @@
+/*-
+ * Copyright (c) 2014 Adrian Chadd <adrian@FreeBSD.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * $FreeBSD$
+ */
+#ifndef	__IF_IWI_IOCTL_H__
+#define	__IF_IWI_IOCTL_H__
+
+/* XXX how should I pick appropriate ioctl numbers? */
+#define	SIOCGIWISTATS		_IOWR('i', 147, struct ifreq)
+#define	SIOCZIWISTATS		_IOWR('i', 148, struct ifreq)
+
+#endif	/* __IF_IWI_IOCTL_H__ */

sys/dev/iwi/if_iwireg.h

@@ -221,6 +221,7 @@ struct iwi_notif_association {
 /* structure for notification IWI_NOTIF_TYPE_SCAN_CHANNEL */
 struct iwi_notif_scan_channel {
 	uint8_t	nchan;
+	/* XXX this is iwi_cmd_stats, and a u8 reserved field */
 	uint8_t	reserved[47];
 } __packed;
 
@@ -239,6 +240,68 @@ struct iwi_notif_beacon_state {
 	uint32_t number;
 } __packed;
 
+/* structure(s) for notification IWI_NOTIF_TYPE_LINK_QUALITY */
+
+#define RX_FREE_BUFFERS 32
+#define RX_LOW_WATERMARK 8
+
+#define SUP_RATE_11A_MAX_NUM_CHANNELS  8
+#define SUP_RATE_11B_MAX_NUM_CHANNELS  4
+#define SUP_RATE_11G_MAX_NUM_CHANNELS  12
+
+// Used for passing to driver number of successes and failures per rate
+struct iwi_rate_histogram {
+        union {
+                uint32_t a[SUP_RATE_11A_MAX_NUM_CHANNELS];
+                uint32_t b[SUP_RATE_11B_MAX_NUM_CHANNELS];
+                uint32_t g[SUP_RATE_11G_MAX_NUM_CHANNELS];
+        } success;
+        union {
+                uint32_t a[SUP_RATE_11A_MAX_NUM_CHANNELS];
+                uint32_t b[SUP_RATE_11B_MAX_NUM_CHANNELS];
+                uint32_t g[SUP_RATE_11G_MAX_NUM_CHANNELS];
+        } failed;
+} __packed;
+
+/* statistics command response */
+struct iwi_cmd_stats {
+	uint8_t cmd_id;
+	uint8_t seq_num;
+	uint16_t good_sfd;
+	uint16_t bad_plcp;
+	uint16_t wrong_bssid;
+	uint16_t valid_mpdu;
+	uint16_t bad_mac_header;
+	uint16_t reserved_frame_types;
+	uint16_t rx_ina;
+	uint16_t bad_crc32;
+	uint16_t invalid_cts;
+	uint16_t invalid_acks;
+	uint16_t long_distance_ina_fina;
+	uint16_t dsp_silence_unreachable;
+	uint16_t accumulated_rssi;
+	uint16_t rx_ovfl_frame_tossed;
+	uint16_t rssi_silence_threshold;
+	uint16_t rx_ovfl_frame_supplied;
+	uint16_t last_rx_frame_signal;
+	uint16_t last_rx_frame_noise;
+	uint16_t rx_autodetec_no_ofdm;
+	uint16_t rx_autodetec_no_barker;
+	uint16_t reserved;
+} __packed;
+
+#define	SILENCE_OVER_THRESH		(1)
+#define	SILENCE_UNDER_THRESH		(2)
+
+struct iwi_notif_link_quality {
+	struct iwi_cmd_stats stats;
+	uint8_t rate;
+	uint8_t modulation;
+	struct iwi_rate_histogram histogram;
+	uint8_t silence_notification_type;   /* SILENCE_OVER/UNDER_THRESH */
+	uint16_t silence_count;
+} __packed;
+
 /* received frame header */
 struct iwi_frame {
 	uint32_t	reserved1[2];

sys/dev/iwi/if_iwivar.h

@@ -215,6 +215,9 @@ struct iwi_softc {
 
 	struct iwi_rx_radiotap_header sc_rxtap;
 	struct iwi_tx_radiotap_header sc_txtap;
+
+	struct iwi_notif_link_quality sc_linkqual;
+	int			sc_linkqual_valid;
 };
 
 #define	IWI_STATE_BEGIN(_sc, _state)	do {			\