Add initial support for MIMO statistics to net80211.

This introduces struct ieee80211_rx_stats - which stores the various kinds
of RX statistics which a MIMO and non-MIMO 802.11 device can export.

It also fleshes out the mimo export to userland (node_getmimoinfo()).

It assumes that MIMO radios (for now) export both ctl and ext channels.
Non-11n MIMO radios are possible (and I believe Atheros made at least
one), so if that chipset support is added, extra flags to the
struct ieee80211_rx_stats can be added to extend this support.

Two new input functions have been added - ieee80211_input_mimo() and
ieee80211_input_mimo_all() - which MIMO-aware devices can call with
MIMO specific statistics.

802.11 devices calling the non-MIMO input functions will still function.

1 files changed, 7 insertions, 0 deletions

diff --git a/sys/net80211/ieee80211_node.h b/sys/net80211/ieee80211_node.h
index 01bb2cf..c1fc0069 100644
--- a/sys/net80211/ieee80211_node.h
+++ b/sys/net80211/ieee80211_node.h
@@ -166,6 +166,13 @@ struct ieee80211_node {
 	uint32_t		ni_avgrssi;	/* recv ssi state */
 	int8_t			ni_noise;	/* noise floor */
 
+	/* mimo statistics */
+	uint32_t		ni_mimo_rssi_ctl[IEEE80211_MAX_CHAINS];
+	uint32_t		ni_mimo_rssi_ext[IEEE80211_MAX_CHAINS];
+	uint8_t			ni_mimo_noise_ctl[IEEE80211_MAX_CHAINS];
+	uint8_t			ni_mimo_noise_ext[IEEE80211_MAX_CHAINS];
+	uint8_t			ni_mimo_chains;
+
 	/* header */
 	uint8_t			ni_macaddr[IEEE80211_ADDR_LEN];
 	uint8_t			ni_bssid[IEEE80211_ADDR_LEN];