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From:   Sathishkumar Muruganandam <murugana@codeaurora.org>
To:     ath10k@lists.infradead.org
Cc:     linux-wireless@vger.kernel.org,
        Sathishkumar Muruganandam <murugana@codeaurora.org>
Subject: [PATCH] ath10k: Disable 4addr source port learning in 10.4 FW by default
Date:   Fri,  9 Nov 2018 11:41:21 +0530
Message-Id: <20181109061121.4184-1-murugana@codeaurora.org>
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

Currently in 10.4 FW, all the received 4addr frames are processed for 
source port learning which is enabled by default. This learning can't 
be disabled by default in FW since it breaks backward compatibility.

Since ath10k uses mac80211 based 4addr mode, source port learning done 
in 10.4 FW is redundant and also causes issues when 3addr frames are
transmitted/received for a 4addr station.

One such visible functional impact is when GTK rekey frame from
hostapd based AP to 4addr STA is dropped in AP's 10.4 FW. This is since
GTK rekey EAPOL frame is 3addr frame on AP interface and STA enabled
with 4addr is already allowed for receiving 3addr EAPOL frames.

Source port learning implementation in 10.4 FW drops this 3addr GTK rekey
frame in AP destinated for 4addr STA causing disassociation and
re-association for every GTK rekey session. GTK rekey issue is not seen
when learning is disabled in FW.

To prevent such issues without breaking backward compatibility, FW
advertises new service bit making the source port learning configurable and
this learning is being currently disabled during ath10k vdev creation.

* Tested HW: QCA9984
* Tested FW: 10.4-3.6.0.1-00003

Signed-off-by: Sathishkumar Muruganandam <murugana@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/mac.c | 11 +++++++++++
 drivers/net/wireless/ath/ath10k/wmi.c |  2 ++
 drivers/net/wireless/ath/ath10k/wmi.h | 21 ++++++++++++++++++++-
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index c5130fa264eb..aac4d842d504 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -5154,6 +5154,17 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
 		goto err;
 	}
 
+	if (test_bit(WMI_SERVICE_VDEV_DISABLE_4_ADDR_SRC_LRN_SUPPORT,
+		     ar->wmi.svc_map)) {
+		vdev_param = ar->wmi.vdev_param->disable_4addr_src_lrn;
+		ret = ath10k_wmi_vdev_set_param(ar, arvif->vdev_id, vdev_param,
+						WMI_VDEV_DISABLE_4_ADDR_SRC_LRN);
+		if (ret && ret != -EOPNOTSUPP) {
+			ath10k_warn(ar, "failed to disable 4addr src lrn vdev %i: %d\n",
+				    arvif->vdev_id, ret);
+		}
+	}
+
 	ar->free_vdev_map &= ~(1LL << arvif->vdev_id);
 	spin_lock_bh(&ar->data_lock);
 	list_add(&arvif->list, &ar->arvifs);
diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index 659513bf4ddc..8757ae297084 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -825,6 +825,7 @@ static struct wmi_vdev_param_map wmi_vdev_param_map = {
 	.meru_vc = WMI_VDEV_PARAM_UNSUPPORTED,
 	.rx_decap_type = WMI_VDEV_PARAM_UNSUPPORTED,
 	.bw_nss_ratemask = WMI_VDEV_PARAM_UNSUPPORTED,
+	.disable_4addr_src_lrn = WMI_VDEV_PARAM_UNSUPPORTED,
 };
 
 /* 10.X WMI VDEV param map */
@@ -900,6 +901,7 @@ static struct wmi_vdev_param_map wmi_10x_vdev_param_map = {
 	.meru_vc = WMI_VDEV_PARAM_UNSUPPORTED,
 	.rx_decap_type = WMI_VDEV_PARAM_UNSUPPORTED,
 	.bw_nss_ratemask = WMI_VDEV_PARAM_UNSUPPORTED,
+	.disable_4addr_src_lrn = WMI_VDEV_PARAM_UNSUPPORTED,
 };
 
 static struct wmi_vdev_param_map wmi_10_2_4_vdev_param_map = {
diff --git a/drivers/net/wireless/ath/ath10k/wmi.h b/drivers/net/wireless/ath/ath10k/wmi.h
index 58e33ab9e0e9..3e17be938420 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.h
+++ b/drivers/net/wireless/ath/ath10k/wmi.h
@@ -205,6 +205,7 @@ enum wmi_service {
 	WMI_SERVICE_SPOOF_MAC_SUPPORT,
 	WMI_SERVICE_TX_DATA_ACK_RSSI,
 	WMI_SERVICE_VDEV_DIFFERENT_BEACON_INTERVAL_SUPPORT,
+	WMI_SERVICE_VDEV_DISABLE_4_ADDR_SRC_LRN_SUPPORT,
 
 	/* keep last */
 	WMI_SERVICE_MAX,
@@ -359,6 +360,9 @@ enum wmi_10_4_service {
 	WMI_10_4_SERVICE_PEER_TID_CONFIGS_SUPPORT,
 	WMI_10_4_SERVICE_VDEV_BCN_RATE_CONTROL,
 	WMI_10_4_SERVICE_VDEV_DIFFERENT_BEACON_INTERVAL_SUPPORT,
+	WMI_10_4_SERVICE_HTT_ASSERT_TRIGGER_SUPPORT,
+	WMI_10_4_SERVICE_VDEV_FILTER_NEIGHBOR_RX_PACKETS,
+	WMI_10_4_SERVICE_VDEV_DISABLE_4_ADDR_SRC_LRN_SUPPORT,
 };
 
 static inline char *wmi_service_name(int service_id)
@@ -786,6 +790,8 @@ static inline void wmi_10_4_svc_map(const __le32 *in, unsigned long *out,
 	       WMI_SERVICE_TX_DATA_ACK_RSSI, len);
 	SVCMAP(WMI_10_4_SERVICE_VDEV_DIFFERENT_BEACON_INTERVAL_SUPPORT,
 	       WMI_SERVICE_VDEV_DIFFERENT_BEACON_INTERVAL_SUPPORT, len);
+	SVCMAP(WMI_10_4_SERVICE_VDEV_DISABLE_4_ADDR_SRC_LRN_SUPPORT,
+	       WMI_SERVICE_VDEV_DISABLE_4_ADDR_SRC_LRN_SUPPORT, len);
 }
 
 #undef SVCMAP
@@ -5065,6 +5071,7 @@ struct wmi_vdev_param_map {
 	u32 bw_nss_ratemask;
 	u32 inc_tsf;
 	u32 dec_tsf;
+	u32 disable_4addr_src_lrn;
 };
 
 #define WMI_VDEV_PARAM_UNSUPPORTED 0
@@ -5404,7 +5411,19 @@ enum wmi_10_4_vdev_param {
 	WMI_10_4_VDEV_PARAM_ATF_SSID_SCHED_POLICY,
 	WMI_10_4_VDEV_PARAM_DISABLE_DYN_BW_RTS,
 	WMI_10_4_VDEV_PARAM_TSF_DECREMENT,
-};
+	WMI_10_4_VDEV_PARAM_SELFGEN_FIXED_RATE,
+	WMI_10_4_VDEV_PARAM_AMPDU_SUBFRAME_SIZE_PER_AC,
+	WMI_10_4_VDEV_PARAM_NSS_VHT160,
+	WMI_10_4_VDEV_PARAM_NSS_VHT80_80,
+	WMI_10_4_VDEV_PARAM_AMSDU_SUBFRAME_SIZE_PER_AC,
+	WMI_10_4_VDEV_PARAM_DISABLE_CABQ,
+	WMI_10_4_VDEV_PARAM_SIFS_TRIGGER_RATE,
+	WMI_10_4_VDEV_PARAM_TX_POWER,
+	WMI_10_4_VDEV_PARAM_ENABLE_DISABLE_RTT_RESPONDER_ROLE,
+	WMI_10_4_VDEV_PARAM_DISABLE_4_ADDR_SRC_LRN,
+};
+
+#define WMI_VDEV_DISABLE_4_ADDR_SRC_LRN 1
 
 #define WMI_VDEV_PARAM_TXBF_SU_TX_BFEE BIT(0)
 #define WMI_VDEV_PARAM_TXBF_MU_TX_BFEE BIT(1)
-- 
2.17.1