Patch "wifi: ath11k: fix number of VHT beamformee spatial streams" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    wifi: ath11k: fix number of VHT beamformee spatial streams

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-ath11k-fix-number-of-vht-beamformee-spatial-str.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d1b98857bf0022c7aa713adc95808ac6da8b57ce
Author: Jesus Fernandez Manzano <jesus.manzano@xxxxxxxxxx>
Date:   Thu Sep 22 10:35:14 2022 +0300

    wifi: ath11k: fix number of VHT beamformee spatial streams
    
    [ Upstream commit 55b5ee3357d7bb98ee578cf9b84a652e7a1bc199 ]
    
    The number of spatial streams used when acting as a beamformee in VHT
    mode are reported by the firmware as 7 (8 sts - 1) both in IPQ6018 and
    IPQ8074 which respectively have 2 and 4 sts each. So the firmware should
    report 1 (2 - 1) and 3 (4 - 1).
    
    Fix this by checking that the number of VHT beamformee sts reported by
    the firmware is not greater than the number of receiving antennas - 1.
    The fix is based on the same approach used in this same function for
    sanitizing the number of sounding dimensions reported by the firmware.
    
    Without this change, acting as a beamformee in VHT mode is not working
    properly.
    
    Tested-on: IPQ6018 hw1.0 AHB WLAN.HK.2.5.0.1-01208-QCAHKSWPL_SILICONZ-1
    Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.5.0.1-01208-QCAHKSWPL_SILICONZ-1
    
    Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
    Signed-off-by: Jesus Fernandez Manzano <jesus.manzano@xxxxxxxxxx>
    Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20220616173947.21901-1-jesus.manzano@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index c7ee373a9d2c..ae6e14fe03c7 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -3684,6 +3684,8 @@ static int ath11k_mac_set_txbf_conf(struct ath11k_vif *arvif)
 	if (vht_cap & (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) {
 		nsts = vht_cap & IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 		nsts >>= IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT;
+		if (nsts > (ar->num_rx_chains - 1))
+			nsts = ar->num_rx_chains - 1;
 		value |= SM(nsts, WMI_TXBF_STS_CAP_OFFSET);
 	}
 
@@ -3724,7 +3726,7 @@ static int ath11k_mac_set_txbf_conf(struct ath11k_vif *arvif)
 static void ath11k_set_vht_txbf_cap(struct ath11k *ar, u32 *vht_cap)
 {
 	bool subfer, subfee;
-	int sound_dim = 0;
+	int sound_dim = 0, nsts = 0;
 
 	subfer = !!(*vht_cap & (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE));
 	subfee = !!(*vht_cap & (IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE));
@@ -3734,6 +3736,11 @@ static void ath11k_set_vht_txbf_cap(struct ath11k *ar, u32 *vht_cap)
 		subfer = false;
 	}
 
+	if (ar->num_rx_chains < 2) {
+		*vht_cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
+		subfee = false;
+	}
+
 	/* If SU Beaformer is not set, then disable MU Beamformer Capability */
 	if (!subfer)
 		*vht_cap &= ~(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE);
@@ -3746,7 +3753,9 @@ static void ath11k_set_vht_txbf_cap(struct ath11k *ar, u32 *vht_cap)
 	sound_dim >>= IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_SHIFT;
 	*vht_cap &= ~IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK;
 
-	/* TODO: Need to check invalid STS and Sound_dim values set by FW? */
+	nsts = (*vht_cap & IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
+	nsts >>= IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT;
+	*vht_cap &= ~IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
 
 	/* Enable Sounding Dimension Field only if SU BF is enabled */
 	if (subfer) {
@@ -3758,9 +3767,15 @@ static void ath11k_set_vht_txbf_cap(struct ath11k *ar, u32 *vht_cap)
 		*vht_cap |= sound_dim;
 	}
 
-	/* Use the STS advertised by FW unless SU Beamformee is not supported*/
-	if (!subfee)
-		*vht_cap &= ~(IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
+	/* Enable Beamformee STS Field only if SU BF is enabled */
+	if (subfee) {
+		if (nsts > (ar->num_rx_chains - 1))
+			nsts = ar->num_rx_chains - 1;
+
+		nsts <<= IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT;
+		nsts &=  IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;
+		*vht_cap |= nsts;
+	}
 }
 
 static struct ieee80211_sta_vht_cap



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