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From:   Markus Theil <markus.theil@tu-ilmenau.de>
To:     nbd@nbd.name
Cc:     linux-wireless@vger.kernel.org, lorenzo.bianconi@redhat.com,
        Stanislaw Gruszka <sgruszka@redhat.com>,
        Markus Theil <markus.theil@tu-ilmenau.de>
Subject: [PATCH v3 2/4] mt76: mt76x02: split beaconing
Date:   Mon, 18 Nov 2019 15:40:38 +0100
Message-Id: <20191118144040.15639-3-markus.theil@tu-ilmenau.de>
In-Reply-To: <20191118144040.15639-1-markus.theil@tu-ilmenau.de>
References: <20191118144040.15639-1-markus.theil@tu-ilmenau.de>
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Sender: linux-wireless-owner@vger.kernel.org
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Sending beacons to the hardware always happens in batches. In order to
speed up beacon processing on usb devices, this patch splits out common
code an calls it only once (mt76x02_mac_set_beacon_prepare,
mt76x02_mac_set_beacon_finish). Making this split breaks beacon
enabling/disabling per vif. This is fixed by adding a call to set the
bypass mask, if beaconing should be disabled for a vif. Otherwise the
beacon is send after the next beacon interval.

The code is also adapted for the mmio part of the driver, but should not
have any performance implication there.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
---
 .../wireless/mediatek/mt76/mt76x02_beacon.c   | 44 +++++++------------
 .../net/wireless/mediatek/mt76/mt76x02_mac.h  |  1 +
 .../net/wireless/mediatek/mt76/mt76x02_mmio.c |  5 +++
 .../wireless/mediatek/mt76/mt76x02_usb_core.c |  5 +++
 4 files changed, 26 insertions(+), 29 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c b/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c
index 403866496640..09013adae854 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c
@@ -47,10 +47,6 @@ __mt76x02_mac_set_beacon(struct mt76x02_dev *dev, u8 bcn_idx,
 	int beacon_len = dev->beacon_ops->slot_size;
 	int beacon_addr = MT_BEACON_BASE + (beacon_len * bcn_idx);
 	int ret = 0;
-	int i;
-
-	/* Prevent corrupt transmissions during update */
-	mt76_set(dev, MT_BCN_BYPASS_MASK, BIT(bcn_idx));
 
 	if (skb) {
 		ret = mt76x02_write_beacon(dev, beacon_addr, skb);
@@ -60,41 +56,30 @@ __mt76x02_mac_set_beacon(struct mt76x02_dev *dev, u8 bcn_idx,
 		dev->beacon_data_mask &= ~BIT(bcn_idx);
 	}
 
-	mt76_wr(dev, MT_BCN_BYPASS_MASK, 0xff00 | ~dev->beacon_data_mask);
-
 	return ret;
 }
 
-int mt76x02_mac_set_beacon(struct mt76x02_dev *dev, u8 vif_idx,
-			   struct sk_buff *skb)
+void mt76x02_mac_set_beacon_finish(struct mt76x02_dev *dev)
 {
-	bool force_update = false;
-	int bcn_idx = 0;
 	int i;
+	int bcn_idx = 0;
 
-	for (i = 0; i < ARRAY_SIZE(dev->beacons); i++) {
-		if (vif_idx == i) {
-			force_update = !!dev->beacons[i] ^ !!skb;
-			dev_kfree_skb(dev->beacons[i]);
-			dev->beacons[i] = skb;
-			__mt76x02_mac_set_beacon(dev, bcn_idx, skb);
-		} else if (force_update && dev->beacons[i]) {
-			__mt76x02_mac_set_beacon(dev, bcn_idx,
-						 dev->beacons[i]);
-		}
-
+	for (i = 0; i < hweight8(dev->mt76.beacon_mask); ++i)
 		bcn_idx += !!dev->beacons[i];
-	}
-
-	for (i = bcn_idx; i < ARRAY_SIZE(dev->beacons); i++) {
-		if (!(dev->beacon_data_mask & BIT(i)))
-			break;
-
-		__mt76x02_mac_set_beacon(dev, i, NULL);
-	}
 
 	mt76_rmw_field(dev, MT_MAC_BSSID_DW1, MT_MAC_BSSID_DW1_MBEACON_N,
 		       bcn_idx - 1);
+
+	mt76_wr(dev, MT_BCN_BYPASS_MASK, 0xff00 | ~dev->beacon_data_mask);
+}
+EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon_finish);
+
+int mt76x02_mac_set_beacon(struct mt76x02_dev *dev, u8 vif_idx,
+			   struct sk_buff *skb)
+{
+	dev_kfree_skb(dev->beacons[vif_idx]);
+	dev->beacons[vif_idx] = skb;
+	__mt76x02_mac_set_beacon(dev, vif_idx, skb);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(mt76x02_mac_set_beacon);
@@ -115,6 +100,7 @@ void mt76x02_mac_set_beacon_enable(struct mt76x02_dev *dev,
 	} else {
 		dev->mt76.beacon_mask &= ~BIT(mvif->idx);
 		mt76x02_mac_set_beacon(dev, mvif->idx, NULL);
+		mt76_set(dev, MT_BCN_BYPASS_MASK, BIT(mvif->idx));
 	}
 
 	if (!!old_mask == !!dev->mt76.beacon_mask)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.h b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.h
index efa4ef945e35..e6e585c72f0d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.h
@@ -197,6 +197,7 @@ int mt76x02_mac_set_beacon(struct mt76x02_dev *dev, u8 vif_idx,
 			   struct sk_buff *skb);
 void mt76x02_mac_set_beacon_enable(struct mt76x02_dev *dev,
 				   struct ieee80211_vif *vif, bool enable);
+void mt76x02_mac_set_beacon_finish(struct mt76x02_dev *dev);
 
 void mt76x02_edcca_init(struct mt76x02_dev *dev);
 #endif
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
index dc773070481d..73c39d03b7f8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
@@ -24,10 +24,15 @@ static void mt76x02_pre_tbtt_tasklet(unsigned long arg)
 
 	mt76x02_resync_beacon_timer(dev);
 
+	/* Prevent corrupt transmissions during update */
+	mt76_set(dev, MT_BCN_BYPASS_MASK, 0xffff);
+
 	ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
 		IEEE80211_IFACE_ITER_RESUME_ALL,
 		mt76x02_update_beacon_iter, dev);
 
+	mt76x02_mac_set_beacon_finish(dev);
+
 	mt76_csa_check(&dev->mt76);
 
 	if (dev->mt76.csa_complete)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
index 78dfc1e7f27b..8a2a90fb5663 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c
@@ -179,6 +179,9 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
 
 	mt76x02_resync_beacon_timer(dev);
 
+	/* Prevent corrupt transmissions during update */
+	mt76_set(dev, MT_BCN_BYPASS_MASK, 0xffff);
+
 	ieee80211_iterate_active_interfaces(mt76_hw(dev),
 		IEEE80211_IFACE_ITER_RESUME_ALL,
 		mt76x02_update_beacon_iter, dev);
@@ -191,6 +194,8 @@ static void mt76x02u_pre_tbtt_work(struct work_struct *work)
 		mt76x02_mac_set_beacon(dev, i, skb);
 	}
 
+	mt76x02_mac_set_beacon_finish(dev);
+
 	mt76x02u_restart_pre_tbtt_timer(dev);
 }
 
-- 
2.24.0