git: 871bfac8b260 - releng/13.1 - LinuxKPI: 802.11: fix RSSI (and NF)

The branch releng/13.1 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=871bfac8b260273ea79838f9b49a4c4b8a8df866

commit 871bfac8b260273ea79838f9b49a4c4b8a8df866
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2022-04-01 22:31:23 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2022-04-05 19:11:00 +0000

    LinuxKPI: 802.11: fix RSSI (and NF)
    
    As in 4a22cd6c4e5f4fc4a38aa7400742d4005c5ae3de nf and rss should be
    signed and not unsigned.  Change the types in the header and while
    here change a magic number to a define as done elsewhere (value does
    not change).
    
    When calculating c_rssi we need to make it relative so subtract nf.
    And while here improve the debug output.
    
    This will hopefully fix ifconfig wlanN list scan S:N output which
    tools use to chose a BSSID and help net80211 internal calculations.
    
    Sponsored by:   The FreeBSD Foundation
    Approved by:    re (gjb)
    
    (cherry picked from commit 60970a328e280b25b05f1d9a9de1ef91af573c4a)
    (cherry picked from commit 7b9d8e33bc4ee0b8cc22ab28a1f09a062e103bd5)
---
 sys/compat/linuxkpi/common/include/net/mac80211.h |  4 ++--
 sys/compat/linuxkpi/common/src/linux_80211.c      | 10 ++++++----
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/sys/compat/linuxkpi/common/include/net/mac80211.h b/sys/compat/linuxkpi/common/include/net/mac80211.h
index 4e3342837ddc..49088cdea0eb 100644
--- a/sys/compat/linuxkpi/common/include/net/mac80211.h
+++ b/sys/compat/linuxkpi/common/include/net/mac80211.h
@@ -509,8 +509,8 @@ struct ieee80211_rx_status {
 	uint8_t				ampdu_reference;
 	uint8_t				band;
 	uint8_t				chains;
-	uint8_t				chain_signal[4];
-	uint8_t				signal;
+	int8_t				chain_signal[IEEE80211_MAX_CHAINS];
+	int8_t				signal;
 	uint8_t				enc_flags;
 	uint8_t				he_dcm;
 	uint8_t				he_gi;
diff --git a/sys/compat/linuxkpi/common/src/linux_80211.c b/sys/compat/linuxkpi/common/src/linux_80211.c
index 13ad2908c021..72bbb1ff1382 100644
--- a/sys/compat/linuxkpi/common/src/linux_80211.c
+++ b/sys/compat/linuxkpi/common/src/linux_80211.c
@@ -3696,7 +3696,7 @@ linuxkpi_ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 	/* Implement a dump_rxcb() !!! */
 	if (linuxkpi_debug_80211 & D80211_TRACE_RX)
 		printf("TRACE %s: RXCB: %ju %ju %u, %#0x, %u, %#0x, %#0x, "
-		    "%u band %u, %u %u %u %u, %u, %#x %#x %#x %#x %u %u %u\n",
+		    "%u band %u, %u { %d %d %d %d }, %d, %#x %#x %#x %#x %u %u %u\n",
 			__func__,
 			(uintmax_t)rx_status->boottime_ns,
 			(uintmax_t)rx_status->mactime,
@@ -3711,6 +3711,7 @@ linuxkpi_ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 			rx_status->chain_signal[0],
 			rx_status->chain_signal[1],
 			rx_status->chain_signal[2],
+			rx_status->chain_signal[3],
 			rx_status->signal,
 			rx_status->enc_flags,
 			rx_status->he_dcm,
@@ -3724,12 +3725,14 @@ no_trace_beacons:
 
 	memset(&rx_stats, 0, sizeof(rx_stats));
 	rx_stats.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
+	/* XXX-BZ correct hardcoded rssi and noise floor, how? survey? */
+	rx_stats.c_nf = -96;
 	if (ieee80211_hw_check(hw, SIGNAL_DBM) &&
 	    !(rx_status->flag & RX_FLAG_NO_SIGNAL_VAL))
 		rx_stats.c_rssi = rx_status->signal;
 	else
-		rx_stats.c_rssi = 0;			/* XXX */
-	rx_stats.c_nf = -96;				/* XXX */
+		rx_stats.c_rssi = 0;
+	rx_stats.c_rssi -= rx_stats.c_nf;
 	rx_stats.r_flags |= IEEE80211_R_BAND;
 	rx_stats.c_band =
 	    lkpi_nl80211_band_to_net80211_band(rx_status->band);
@@ -3737,7 +3740,6 @@ no_trace_beacons:
 	rx_stats.c_freq = rx_status->freq;
 	rx_stats.c_ieee = ieee80211_mhz2ieee(rx_stats.c_freq, rx_stats.c_band);
 
-	/* XXX-BZ correct hardcoded rssi and noise floor. */
 	/* XXX (*sta_statistics)() to get to some of that? */
 	/* XXX-BZ dump the FreeBSD version of rx_stats as well! */