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* [PATCH v3 01/11] mt76:  add hash lookup for skb on TXS status_list.
@ 2021-07-23 16:06 greearb
  2021-07-23 16:06 ` [PATCH v3 02/11] mt76 - mt7915: Fix potential NPE in TXS processing greearb
                   ` (9 more replies)
  0 siblings, 10 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

This improves performance when sending lots of frames that
are requesting being mapped to a TXS callback.

Add comments to help next person understood the tx path
better.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---

v3:  Rebase on top of the x/8 series, move ethtool to main.c

 drivers/net/wireless/mediatek/mt76/mt76.h     | 45 ++++++++---
 .../net/wireless/mediatek/mt76/mt7603/mac.c   |  2 +-
 .../net/wireless/mediatek/mt76/mt7615/mac.c   |  2 +-
 .../net/wireless/mediatek/mt76/mt76x02_mac.c  |  2 +-
 .../net/wireless/mediatek/mt76/mt7915/mac.c   |  8 +-
 .../net/wireless/mediatek/mt76/mt7921/mac.c   |  7 +-
 drivers/net/wireless/mediatek/mt76/tx.c       | 79 ++++++++++++++++---
 7 files changed, 117 insertions(+), 28 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 436bf2b8e2cd..1e6b8b072aec 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -235,6 +235,14 @@ DECLARE_EWMA(signal, 10, 8);
 #define MT_WCID_TX_INFO_TXPWR_ADJ	GENMASK(25, 18)
 #define MT_WCID_TX_INFO_SET		BIT(31)
 
+#define MT_PACKET_ID_MASK		GENMASK(6, 0)
+#define MT_PACKET_ID_NO_ACK		0
+/* Request TXS, but don't try to match with skb. */
+#define MT_PACKET_ID_NO_SKB		1
+#define MT_PACKET_ID_FIRST		2
+#define MT_PACKET_ID_HAS_RATE		BIT(7)
+#define MT_PACKET_ID_MAX		(GENMASK(7, 0) - 1)
+
 struct mt76_wcid {
 	struct mt76_rx_tid __rcu *aggr[IEEE80211_NUM_TIDS];
 
@@ -246,6 +254,8 @@ struct mt76_wcid {
 
 	struct rate_info rate;
 
+	struct sk_buff *skb_status_array[MT_PACKET_ID_MAX + 1];
+
 	u16 idx;
 	u8 hw_key_idx;
 	u8 hw_key_idx2;
@@ -302,13 +312,8 @@ struct mt76_rx_tid {
 #define MT_TX_CB_TXS_DONE		BIT(1)
 #define MT_TX_CB_TXS_FAILED		BIT(2)
 
-#define MT_PACKET_ID_MASK		GENMASK(6, 0)
-#define MT_PACKET_ID_NO_ACK		0
-#define MT_PACKET_ID_NO_SKB		1
-#define MT_PACKET_ID_FIRST		2
-#define MT_PACKET_ID_HAS_RATE		BIT(7)
-
-#define MT_TX_STATUS_SKB_TIMEOUT	HZ
+/* This is timer for when to give up when waiting for TXS callback. */
+#define MT_TX_STATUS_SKB_TIMEOUT	(HZ / 8)
 
 struct mt76_tx_cb {
 	unsigned long jiffies;
@@ -651,6 +656,7 @@ struct mt76_dev {
 	spinlock_t cc_lock;
 
 	u32 cur_cc_bss_rx;
+	unsigned long next_status_jiffies;
 
 	struct mt76_rx_status rx_ampdu_status;
 	u32 rx_ampdu_len;
@@ -1090,7 +1096,7 @@ struct sk_buff *mt76_tx_status_skb_get(struct mt76_dev *dev,
 				       struct mt76_wcid *wcid, int pktid,
 				       struct sk_buff_head *list);
 void mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb,
-			     struct sk_buff_head *list);
+			     struct sk_buff_head *list, struct mt76_wcid *wcid);
 void __mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid, struct sk_buff *skb,
 			    struct list_head *free_list);
 static inline void
@@ -1297,13 +1303,30 @@ mt76_token_put(struct mt76_dev *dev, int token)
 }
 
 static inline int
-mt76_get_next_pkt_id(struct mt76_wcid *wcid)
+mt76_get_next_pkt_id(struct mt76_wcid *wcid, struct sk_buff *skb)
 {
+	struct sk_buff *qskb;
+
 	wcid->packet_id = (wcid->packet_id + 1) & MT_PACKET_ID_MASK;
-	if (wcid->packet_id == MT_PACKET_ID_NO_ACK ||
-	    wcid->packet_id == MT_PACKET_ID_NO_SKB)
+	if (wcid->packet_id < MT_PACKET_ID_FIRST)
 		wcid->packet_id = MT_PACKET_ID_FIRST;
 
+	qskb = wcid->skb_status_array[wcid->packet_id];
+	if (qskb) {
+		/* bummer, already waiting on this pid.  See if it is stale. */
+		struct mt76_tx_cb *cb = mt76_tx_skb_cb(qskb);
+
+		if (!time_after(jiffies, cb->jiffies + MT_TX_STATUS_SKB_TIMEOUT)) {
+			/* ok, not stale.  Increment pid anyway, will try next
+			 * slot next time
+			 */
+			return MT_PACKET_ID_NO_SKB;
+		}
+	}
+
+	/* cache this skb for fast lookup by packet-id */
+	wcid->skb_status_array[wcid->packet_id] = skb;
+
 	return wcid->packet_id;
 }
 #endif
diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/mac.c b/drivers/net/wireless/mediatek/mt76/mt7603/mac.c
index 3972c56136a2..2f268eb7c1e6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/mac.c
@@ -1230,7 +1230,7 @@ mt7603_mac_add_txs_skb(struct mt7603_dev *dev, struct mt7603_sta *sta, int pid,
 			info->status.rates[0].idx = -1;
 		}
 
-		mt76_tx_status_skb_done(mdev, skb, &list);
+		mt76_tx_status_skb_done(mdev, skb, &list, &sta->wcid);
 	}
 	mt76_tx_status_unlock(mdev, &list);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index ff3f85e4087c..381a998817d4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -1433,7 +1433,7 @@ static bool mt7615_mac_add_txs_skb(struct mt7615_dev *dev,
 			info->status.rates[0].idx = -1;
 		}
 
-		mt76_tx_status_skb_done(mdev, skb, &list);
+		mt76_tx_status_skb_done(mdev, skb, &list, &sta->wcid);
 	}
 	mt76_tx_status_unlock(mdev, &list);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
index c32e6dc68773..fce020e64678 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
@@ -622,7 +622,7 @@ void mt76x02_send_tx_status(struct mt76x02_dev *dev,
 		info = *status.info;
 		len = status.skb->len;
 		ac = skb_get_queue_mapping(status.skb);
-		mt76_tx_status_skb_done(mdev, status.skb, &list);
+		mt76_tx_status_skb_done(mdev, status.skb, &list, wcid);
 	} else if (msta) {
 		len = status.info->status.ampdu_len * ewma_pktlen_read(&msta->pktlen);
 		ac = FIELD_GET(MT_PKTID_AC, cur_pktid);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 1b0a44884569..35e4b57bd133 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1318,6 +1318,8 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 
 	mt76_tx_status_lock(mdev, &list);
 	skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
+
+	/* TODO:  Gather stats anyway, even if we are not matching on an skb. */
 	if (!skb)
 		goto out;
 
@@ -1424,10 +1426,14 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 		stats->tx_bw[0]++;
 		break;
 	}
+
+	/* Cache rate for packets that don't get a TXS callback for some
+	 * reason.
+	 */
 	wcid->rate = rate;
 
 out:
-	mt76_tx_status_skb_done(mdev, skb, &list);
+	mt76_tx_status_skb_done(mdev, skb, &list, wcid);
 	mt76_tx_status_unlock(mdev, &list);
 
 	return !!skb;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
index 76985a6b3be5..a1829a6c4c64 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -732,7 +732,8 @@ mt7921_mac_write_txwi_80211(struct mt7921_dev *dev, __le32 *txwi,
 	txwi[7] |= cpu_to_le32(val);
 }
 
-static void mt7921_update_txs(struct mt76_wcid *wcid, __le32 *txwi)
+static void mt7921_update_txs(struct mt76_wcid *wcid, __le32 *txwi,
+			      struct sk_buff *skb)
 {
 	struct mt7921_sta *msta = container_of(wcid, struct mt7921_sta, wcid);
 	u32 pid, frame_type = FIELD_GET(MT_TXD2_FRAME_TYPE, txwi[2]);
@@ -744,7 +745,7 @@ static void mt7921_update_txs(struct mt76_wcid *wcid, __le32 *txwi)
 		return;
 
 	msta->next_txs_ts = jiffies + msecs_to_jiffies(250);
-	pid = mt76_get_next_pkt_id(wcid);
+	pid = mt76_get_next_pkt_id(wcid, skb);
 	txwi[5] |= cpu_to_le32(MT_TXD5_TX_STATUS_MCU |
 			       FIELD_PREP(MT_TXD5_PID, pid));
 }
@@ -839,7 +840,7 @@ void mt7921_mac_write_txwi(struct mt7921_dev *dev, __le32 *txwi,
 		txwi[3] |= cpu_to_le32(MT_TXD3_BA_DISABLE);
 	}
 
-	mt7921_update_txs(wcid, txwi);
+	mt7921_update_txs(wcid, txwi, skb);
 }
 
 static void
diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 6f302acb6e69..730f37aede3a 100644
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -36,6 +36,7 @@ mt76_tx_check_agg_ssn(struct ieee80211_sta *sta, struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(mt76_tx_check_agg_ssn);
 
+/* Lock list, and initialize the timed-out-skb list object. */
 void
 mt76_tx_status_lock(struct mt76_dev *dev, struct sk_buff_head *list)
 		   __acquires(&dev->status_list.lock)
@@ -45,6 +46,9 @@ mt76_tx_status_lock(struct mt76_dev *dev, struct sk_buff_head *list)
 }
 EXPORT_SYMBOL_GPL(mt76_tx_status_lock);
 
+/* Unlock list, and use last-received status for any skbs that
+ * timed out getting TXS callback (they are on the list passed in
+ */
 void
 mt76_tx_status_unlock(struct mt76_dev *dev, struct sk_buff_head *list)
 		      __releases(&dev->status_list.lock)
@@ -80,7 +84,7 @@ EXPORT_SYMBOL_GPL(mt76_tx_status_unlock);
 
 static void
 __mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, u8 flags,
-			  struct sk_buff_head *list)
+			  struct sk_buff_head *list, struct mt76_wcid *wcid)
 {
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
@@ -89,11 +93,20 @@ __mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, u8 flags,
 	flags |= cb->flags;
 	cb->flags = flags;
 
+	/* Only process skb with TXS status has been received and also
+	 * the txfree (DMA_DONE) callback has happened.
+	 */
 	if ((flags & done) != done)
 		return;
 
 	__skb_unlink(skb, &dev->status_list);
 
+	/* Make sure we clear any cached skb. */
+	if (wcid) {
+		if (!(WARN_ON_ONCE(cb->pktid >= ARRAY_SIZE(wcid->skb_status_array))))
+			wcid->skb_status_array[cb->pktid] = NULL;
+	}
+
 	/* Tx status can be unreliable. if it fails, mark the frame as ACKed */
 	if (flags & MT_TX_CB_TXS_FAILED) {
 		info->status.rates[0].count = 0;
@@ -106,9 +119,9 @@ __mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, u8 flags,
 
 void
 mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb,
-			struct sk_buff_head *list)
+			struct sk_buff_head *list, struct mt76_wcid *wcid)
 {
-	__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_DONE, list);
+	__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_DONE, list, wcid);
 }
 EXPORT_SYMBOL_GPL(mt76_tx_status_skb_done);
 
@@ -119,6 +132,7 @@ mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
 	int pid;
+	int qlen;
 
 	if (!wcid)
 		return MT_PACKET_ID_NO_ACK;
@@ -130,15 +144,30 @@ mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 			     IEEE80211_TX_CTL_RATE_CTRL_PROBE)))
 		return MT_PACKET_ID_NO_SKB;
 
+	/* due to limited range of the pktid (7 bits), we can only
+	 * have a limited number of outstanding frames.  I think it is OK to
+	 * check the length outside of a lock since it doesn't matter too much
+	 * if we read wrong data here.
+	 * The TX-status callbacks don't always return a callback for an SKB,
+	 * so the status_list may contain some stale skbs.  Those will be cleaned
+	 * out periodically, see MT_TX_STATUS_SKB_TIMEOUT.
+	 */
+
+	qlen = skb_queue_len(&dev->status_list);
+	if (qlen > 120)
+		return MT_PACKET_ID_NO_SKB;
+
 	spin_lock_bh(&dev->status_list.lock);
 
 	memset(cb, 0, sizeof(*cb));
-	pid = mt76_get_next_pkt_id(wcid);
+	pid = mt76_get_next_pkt_id(wcid, skb);
 	cb->wcid = wcid->idx;
 	cb->pktid = pid;
 	cb->jiffies = jiffies;
 
-	__skb_queue_tail(&dev->status_list, skb);
+	if (cb->pktid != MT_PACKET_ID_NO_SKB)
+		__skb_queue_tail(&dev->status_list, skb);
+
 	spin_unlock_bh(&dev->status_list.lock);
 
 	return pid;
@@ -150,6 +179,32 @@ mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid,
 		       struct sk_buff_head *list)
 {
 	struct sk_buff *skb, *tmp;
+	struct sk_buff *rvskb = NULL;
+
+	/* If pktid is < first-valid-id, then it is not something we requested
+	 * TXS for, so we will not find SKB.  Bail out early in that case,
+	 * unless we need to walk due to stale-skb-reaper timeout.
+	 */
+	if (pktid < MT_PACKET_ID_FIRST) {
+		if (!time_after(jiffies, dev->next_status_jiffies))
+			return NULL;
+	}
+
+	if (wcid) {
+		if (WARN_ON_ONCE(pktid >= ARRAY_SIZE(wcid->skb_status_array))) {
+			pr_err("invalid pktid: %d  status-array-size: %d\n",
+			       pktid, (int)(ARRAY_SIZE(wcid->skb_status_array)));
+			pktid = 0; /* protect from potential fw bugs */
+		}
+
+		skb = wcid->skb_status_array[pktid];
+
+		/* Make sure we clear our cached skb. */
+		wcid->skb_status_array[pktid] = NULL;
+
+		if (skb && !time_after(jiffies, dev->next_status_jiffies))
+			return skb;
+	}
 
 	skb_queue_walk_safe(&dev->status_list, skb, tmp) {
 		struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
@@ -157,18 +212,22 @@ mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid,
 		if (wcid && cb->wcid != wcid->idx)
 			continue;
 
-		if (cb->pktid == pktid)
-			return skb;
+		if (cb->pktid == pktid) {
+			/* Found our skb, but check for timeouts too */
+			rvskb = skb;
+			continue;
+		}
 
 		if (pktid >= 0 && !time_after(jiffies, cb->jiffies +
 					      MT_TX_STATUS_SKB_TIMEOUT))
 			continue;
 
 		__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_FAILED |
-						    MT_TX_CB_TXS_DONE, list);
+					  MT_TX_CB_TXS_DONE, list, wcid);
 	}
+	dev->next_status_jiffies = jiffies + MT_TX_STATUS_SKB_TIMEOUT + 1;
 
-	return NULL;
+	return rvskb;
 }
 EXPORT_SYMBOL_GPL(mt76_tx_status_skb_get);
 
@@ -238,7 +297,7 @@ void __mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *
 	}
 
 	mt76_tx_status_lock(dev, &list);
-	__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_DMA_DONE, &list);
+	__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_DMA_DONE, &list, wcid);
 	mt76_tx_status_unlock(dev, &list);
 
 out:
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 02/11] mt76 - mt7915:  Fix potential NPE in TXS processing.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 03/11] mt76 - mt7915: Move TXS parsing to its own method greearb
                   ` (8 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

If skb is null, then don't try to dereference it.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 35e4b57bd133..3f4e19358d5b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1321,7 +1321,7 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 
 	/* TODO:  Gather stats anyway, even if we are not matching on an skb. */
 	if (!skb)
-		goto out;
+		goto out_no_skb;
 
 	txs = le32_to_cpu(txs_data[0]);
 	txs5 = le32_to_cpu(txs_data[5]);
@@ -1434,6 +1434,8 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 
 out:
 	mt76_tx_status_skb_done(mdev, skb, &list, wcid);
+
+out_no_skb:
 	mt76_tx_status_unlock(mdev, &list);
 
 	return !!skb;
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 03/11] mt76 - mt7915:  Move TXS parsing to its own method.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
  2021-07-23 16:06 ` [PATCH v3 02/11] mt76 - mt7915: Fix potential NPE in TXS processing greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 04/11] mt76 - mt7915: Allow processing TXS for 'NO_SKB' pkt-ids greearb
                   ` (7 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

This will allow us to also parse TXS when we have no skb on
the status callback list in future patches.

Explicitly cache short_gi and he_gi in wcid, don't try to store
it in the wcid.rate object.  Slightly less confusing and less fragile
when TXS starts parsing lots of frames.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 drivers/net/wireless/mediatek/mt76/mt76.h     |   5 +
 .../net/wireless/mediatek/mt76/mt7915/mac.c   | 122 ++++++++++--------
 2 files changed, 74 insertions(+), 53 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 1e6b8b072aec..c06dc77a0895 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -252,7 +252,12 @@ struct mt76_wcid {
 	struct ewma_signal rssi;
 	int inactive_count;
 
+	/* cached rate, updated from mac_sta_poll() and from TXS callback logic, in 7915
+	 * at least.
+	 */
 	struct rate_info rate;
+	bool rate_short_gi; /* cached HT/VHT short_gi, from mac_sta_poll() */
+	u8 rate_he_gi; /* cached HE GI, from mac_sta_poll() */
 
 	struct sk_buff *skb_status_array[MT_PACKET_ID_MAX + 1];
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 3f4e19358d5b..b1384e02e707 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -205,12 +205,17 @@ static void mt7915_mac_sta_poll(struct mt7915_dev *dev)
 			u8 offs = 24 + 2 * bw;
 
 			rate->he_gi = (val & (0x3 << offs)) >> offs;
+			msta->wcid.rate_he_gi = rate->he_gi; /* cache for later */
 		} else if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) {
-			if (val & BIT(12 + bw))
+			if (val & BIT(12 + bw)) {
 				rate->flags |= RATE_INFO_FLAGS_SHORT_GI;
-			else
+				msta->wcid.rate_short_gi = 1;
+			} else {
 				rate->flags &= ~RATE_INFO_FLAGS_SHORT_GI;
+				msta->wcid.rate_short_gi = 0;
+			}
 		}
+		/* TODO:  Deal with HT_MCS */
 	}
 
 	rcu_read_unlock();
@@ -1302,33 +1307,22 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb)
 	}
 }
 
-static bool
-mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
-		       __le32 *txs_data, struct mt7915_sta_stats *stats)
+static void
+mt7915_mac_parse_txs(struct mt7915_dev *dev, struct mt76_wcid *wcid,
+		     __le32 *txs_data, struct mt7915_sta_stats *stats,
+		     struct rate_info *rate,
+		     struct ieee80211_tx_info *info)
 {
 	struct ieee80211_supported_band *sband;
-	struct mt76_dev *mdev = &dev->mt76;
 	struct mt76_phy *mphy;
-	struct ieee80211_tx_info *info;
-	struct sk_buff_head list;
-	struct rate_info rate = {};
-	struct sk_buff *skb;
-	bool cck = false;
 	u32 txrate, txs, txs5, txs6, txs7, mode;
-
-	mt76_tx_status_lock(mdev, &list);
-	skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
-
-	/* TODO:  Gather stats anyway, even if we are not matching on an skb. */
-	if (!skb)
-		goto out_no_skb;
+	bool cck = false;
 
 	txs = le32_to_cpu(txs_data[0]);
 	txs5 = le32_to_cpu(txs_data[5]);
 	txs6 = le32_to_cpu(txs_data[6]);
 	txs7 = le32_to_cpu(txs_data[7]);
 
-	info = IEEE80211_SKB_CB(skb);
 	if (!(txs & MT_TXS0_ACK_ERROR_MASK))
 		info->flags |= IEEE80211_TX_STAT_ACK;
 
@@ -1344,18 +1338,18 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 
 	txrate = FIELD_GET(MT_TXS0_TX_RATE, txs);
 
-	rate.mcs = FIELD_GET(MT_TX_RATE_IDX, txrate);
-	rate.nss = FIELD_GET(MT_TX_RATE_NSS, txrate) + 1;
+	rate->mcs = FIELD_GET(MT_TX_RATE_IDX, txrate);
+	rate->nss = FIELD_GET(MT_TX_RATE_NSS, txrate) + 1;
 
-	stats->tx_nss[rate.nss - 1]++;
+	stats->tx_nss[rate->nss - 1]++;
 	/* It appears that rate.mcs even for HT may be small, considering in HT
 	 * code below it is multiplied... but not certain on that,
 	 * so code safely.
 	 */
-	if (rate.mcs >= ARRAY_SIZE(stats->tx_mcs))
+	if (rate->mcs >= ARRAY_SIZE(stats->tx_mcs))
 		stats->tx_mcs[ARRAY_SIZE(stats->tx_mcs) - 1]++;
 	else
-		stats->tx_mcs[rate.mcs]++;
+		stats->tx_mcs[rate->mcs]++;
 
 	mode = FIELD_GET(MT_TX_RATE_MODE, txrate);
 	switch (mode) {
@@ -1372,73 +1366,95 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 		else
 			sband = &mphy->sband_2g.sband;
 
-		rate.mcs = mt76_get_rate(mphy->dev, sband, rate.mcs, cck);
-		rate.legacy = sband->bitrates[rate.mcs].bitrate;
+		rate->mcs = mt76_get_rate(mphy->dev, sband, rate->mcs, cck);
+		rate->legacy = sband->bitrates[rate->mcs].bitrate;
 		break;
 	case MT_PHY_TYPE_HT:
 	case MT_PHY_TYPE_HT_GF:
-		rate.mcs += (rate.nss - 1) * 8;
-		if (rate.mcs > 31)
-			goto out;
+		rate->mcs += (rate->nss - 1) * 8;
+		if (rate->mcs > 31)
+			break;
 
-		rate.flags = RATE_INFO_FLAGS_MCS;
-		if (wcid->rate.flags & RATE_INFO_FLAGS_SHORT_GI)
-			rate.flags |= RATE_INFO_FLAGS_SHORT_GI;
+		rate->flags = RATE_INFO_FLAGS_MCS;
+		if (wcid->rate_short_gi)
+			rate->flags |= RATE_INFO_FLAGS_SHORT_GI;
 		break;
 	case MT_PHY_TYPE_VHT:
-		if (rate.mcs > 9)
-			goto out;
+		if (rate->mcs > 9)
+			break;
 
-		rate.flags = RATE_INFO_FLAGS_VHT_MCS;
+		rate->flags = RATE_INFO_FLAGS_VHT_MCS;
+		if (wcid->rate_short_gi)
+			rate->flags |= RATE_INFO_FLAGS_SHORT_GI;
 		break;
 	case MT_PHY_TYPE_HE_SU:
 	case MT_PHY_TYPE_HE_EXT_SU:
 	case MT_PHY_TYPE_HE_TB:
 	case MT_PHY_TYPE_HE_MU:
-		if (rate.mcs > 11)
-			goto out;
+		if (rate->mcs > 11)
+			break;
 
-		rate.he_gi = wcid->rate.he_gi;
-		rate.he_dcm = FIELD_GET(MT_TX_RATE_DCM, txrate);
-		rate.flags = RATE_INFO_FLAGS_HE_MCS;
+		rate->he_gi = wcid->rate_he_gi;
+		rate->he_dcm = FIELD_GET(MT_TX_RATE_DCM, txrate);
+		rate->flags = RATE_INFO_FLAGS_HE_MCS;
 		break;
 	default:
-		goto out;
+		WARN_ON_ONCE(true);
+		mode = 0;
 	}
 
 	stats->tx_mode[mode]++;
 
 	switch (FIELD_GET(MT_TXS0_BW, txs)) {
 	case IEEE80211_STA_RX_BW_160:
-		rate.bw = RATE_INFO_BW_160;
+		rate->bw = RATE_INFO_BW_160;
 		stats->tx_bw[3]++;
 		break;
 	case IEEE80211_STA_RX_BW_80:
-		rate.bw = RATE_INFO_BW_80;
+		rate->bw = RATE_INFO_BW_80;
 		stats->tx_bw[2]++;
 		break;
 	case IEEE80211_STA_RX_BW_40:
-		rate.bw = RATE_INFO_BW_40;
+		rate->bw = RATE_INFO_BW_40;
 		stats->tx_bw[1]++;
 		break;
 	default:
-		rate.bw = RATE_INFO_BW_20;
+		rate->bw = RATE_INFO_BW_20;
 		stats->tx_bw[0]++;
 		break;
 	}
+}
 
-	/* Cache rate for packets that don't get a TXS callback for some
-	 * reason.
+static void
+mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
+		       __le32 *txs_data, struct mt7915_sta_stats *stats)
+{
+	struct mt76_dev *mdev = &dev->mt76;
+	struct ieee80211_tx_info *info;
+	struct ieee80211_tx_info info_stack;
+	struct sk_buff_head list;
+	/* rate is cached in wcid->rate for skbs that do not request to be
+	 * paired with TXS data.  This is normal datapath.
 	 */
-	wcid->rate = rate;
+	struct rate_info *rate = &wcid->rate;
+	struct sk_buff *skb;
 
-out:
-	mt76_tx_status_skb_done(mdev, skb, &list, wcid);
+	mt76_tx_status_lock(mdev, &list);
+	skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
 
-out_no_skb:
-	mt76_tx_status_unlock(mdev, &list);
+	memset(rate, 0, sizeof(*rate));
 
-	return !!skb;
+	if (skb)
+		info = IEEE80211_SKB_CB(skb);
+	else
+		info = &info_stack;
+
+	mt7915_mac_parse_txs(dev, wcid, txs_data, stats, rate, info);
+
+	if (skb)
+		mt76_tx_status_skb_done(mdev, skb, &list, wcid);
+
+	mt76_tx_status_unlock(mdev, &list);
 }
 
 static void mt7915_mac_add_txs(struct mt7915_dev *dev, void *data)
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 04/11] mt76 - mt7915:  Allow processing TXS for 'NO_SKB' pkt-ids.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
  2021-07-23 16:06 ` [PATCH v3 02/11] mt76 - mt7915: Fix potential NPE in TXS processing greearb
  2021-07-23 16:06 ` [PATCH v3 03/11] mt76 - mt7915: Move TXS parsing to its own method greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 05/11] mt76: mt7915: debugfs hook to enable TXS for NO_SKB pkt-ids greearb
                   ` (6 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

This will let us update stats and wcid.rate for every TXS
callback we receive for a particular wcid.

For now, the TXS is not requested for NO_SKB frames, however.
That will be allowed in next patch.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 .../net/wireless/mediatek/mt76/mt7915/mac.c    | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index b1384e02e707..cf2c97bc251d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1047,6 +1047,7 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
 	txwi[4] = 0;
 
 	val = FIELD_PREP(MT_TXD5_PID, pid);
+	/* NOTE:  mt7916 does NOT request TXS for 'NO_SKB' frames by default. */
 	if (pid >= MT_PACKET_ID_FIRST)
 		val |= MT_TXD5_TX_STATUS_HOST;
 	txwi[5] = cpu_to_le32(val);
@@ -1437,10 +1438,16 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 	 * paired with TXS data.  This is normal datapath.
 	 */
 	struct rate_info *rate = &wcid->rate;
-	struct sk_buff *skb;
+	struct sk_buff *skb = NULL;
+	bool check_status;
 
-	mt76_tx_status_lock(mdev, &list);
-	skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
+	check_status = ((pid >= MT_PACKET_ID_FIRST) ||
+			time_after(jiffies, mdev->next_status_jiffies));
+
+	if (check_status) {
+		mt76_tx_status_lock(mdev, &list);
+		skb = mt76_tx_status_skb_get(mdev, wcid, pid, &list);
+	}
 
 	memset(rate, 0, sizeof(*rate));
 
@@ -1454,7 +1461,8 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 	if (skb)
 		mt76_tx_status_skb_done(mdev, skb, &list, wcid);
 
-	mt76_tx_status_unlock(mdev, &list);
+	if (check_status)
+		mt76_tx_status_unlock(mdev, &list);
 }
 
 static void mt7915_mac_add_txs(struct mt7915_dev *dev, void *data)
@@ -1476,7 +1484,7 @@ static void mt7915_mac_add_txs(struct mt7915_dev *dev, void *data)
 	txs = le32_to_cpu(txs_data[3]);
 	pid = FIELD_GET(MT_TXS3_PID, txs);
 
-	if (pid < MT_PACKET_ID_FIRST)
+	if (pid < MT_PACKET_ID_NO_SKB)
 		return;
 
 	if (wcidx >= MT7915_WTBL_SIZE)
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 05/11] mt76: mt7915:  debugfs hook to enable TXS for NO_SKB pkt-ids.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (2 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 04/11] mt76 - mt7915: Allow processing TXS for 'NO_SKB' pkt-ids greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 06/11] mt76: mt7915: Support parsing TXSFM 0x2 greearb
                   ` (5 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

This lets user turn on/off this feature.  Enabling gives better
tx-rate related stats, but will cause extra driver and (maybe)
firmware work.  Not sure if it actually affects performance or
not.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 .../wireless/mediatek/mt76/mt7915/debugfs.c   | 24 +++++++++++++++++++
 .../net/wireless/mediatek/mt76/mt7915/mac.c   |  3 ++-
 .../wireless/mediatek/mt76/mt7915/mt7915.h    |  5 ++++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
index 91664ac63a8d..6be194f16548 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
@@ -109,6 +109,29 @@ mt7915_fw_debug_get(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(fops_fw_debug, mt7915_fw_debug_get,
 			 mt7915_fw_debug_set, "%lld\n");
 
+static int
+mt7915_txs_for_no_skb_set(void *data, u64 val)
+{
+	struct mt7915_dev *dev = data;
+
+	dev->txs_for_no_skb_enabled = !!val;
+
+	return 0;
+}
+
+static int
+mt7915_txs_for_no_skb_get(void *data, u64 *val)
+{
+	struct mt7915_dev *dev = data;
+
+	*val = dev->txs_for_no_skb_enabled;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_txs_for_no_skb, mt7915_txs_for_no_skb_get,
+			 mt7915_txs_for_no_skb_set, "%lld\n");
+
 static void
 mt7915_ampdu_stat_read_phy(struct mt7915_phy *phy,
 			   struct seq_file *file)
@@ -344,6 +367,7 @@ int mt7915_init_debugfs(struct mt7915_dev *dev)
 				    mt7915_queues_acq);
 	debugfs_create_file("tx_stats", 0400, dir, dev, &mt7915_tx_stats_fops);
 	debugfs_create_file("fw_debug", 0600, dir, dev, &fops_fw_debug);
+	debugfs_create_file("txs_for_no_skb", 0600, dir, dev, &fops_txs_for_no_skb);
 	debugfs_create_file("implicit_txbf", 0600, dir, dev,
 			    &fops_implicit_txbf);
 	debugfs_create_u32("dfs_hw_pattern", 0400, dir, &dev->hw_pattern);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index cf2c97bc251d..d81e3cbe1aad 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1048,7 +1048,8 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
 
 	val = FIELD_PREP(MT_TXD5_PID, pid);
 	/* NOTE:  mt7916 does NOT request TXS for 'NO_SKB' frames by default. */
-	if (pid >= MT_PACKET_ID_FIRST)
+	if (pid >= MT_PACKET_ID_FIRST ||
+	    (pid == MT_PACKET_ID_NO_SKB && dev->txs_for_no_skb_enabled))
 		val |= MT_TXD5_TX_STATUS_HOST;
 	txwi[5] = cpu_to_le32(val);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
index 8c494be272c5..cd5954de1686 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
@@ -226,6 +226,11 @@ struct mt7915_dev {
 
 	u16 chainmask;
 	u32 hif_idx;
+	/* Should we request TXS for MT_PACKET_ID_NO_SKB?  Doing so gives better
+	 * costs but causes a great deal more TXS packet processing by driver and
+	 * creation by firmware, so may be a performance drag.
+	 */
+	bool txs_for_no_skb_enabled;
 
 	struct work_struct init_work;
 	struct work_struct rc_work;
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 06/11] mt76: mt7915:  Support parsing TXSFM 0x2.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (3 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 05/11] mt76: mt7915: debugfs hook to enable TXS for NO_SKB pkt-ids greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 07/11] mt76: mt7915: Add support for tx-overrides greearb
                   ` (4 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

Add code to support this format, but I don't actually
see any of these TXS format frames on my test system.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 .../net/wireless/mediatek/mt76/mt7915/mac.c   | 24 +++++++++++--------
 .../net/wireless/mediatek/mt76/mt7915/mac.h   |  3 +++
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index d81e3cbe1aad..03c85bd0750e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1317,13 +1317,10 @@ mt7915_mac_parse_txs(struct mt7915_dev *dev, struct mt76_wcid *wcid,
 {
 	struct ieee80211_supported_band *sband;
 	struct mt76_phy *mphy;
-	u32 txrate, txs, txs5, txs6, txs7, mode;
+	u32 txrate, txs, mode;
 	bool cck = false;
 
 	txs = le32_to_cpu(txs_data[0]);
-	txs5 = le32_to_cpu(txs_data[5]);
-	txs6 = le32_to_cpu(txs_data[6]);
-	txs7 = le32_to_cpu(txs_data[7]);
 
 	if (!(txs & MT_TXS0_ACK_ERROR_MASK))
 		info->flags |= IEEE80211_TX_STAT_ACK;
@@ -1334,10 +1331,6 @@ mt7915_mac_parse_txs(struct mt7915_dev *dev, struct mt76_wcid *wcid,
 
 	info->status.rates[0].idx = -1;
 
-	stats->tx_mpdu_attempts += FIELD_GET(MT_TXS5_F1_MPDU_TX_COUNT, txs5);
-	stats->tx_mpdu_fail += FIELD_GET(MT_TXS6_F1_MPDU_FAIL_COUNT, txs6);
-	stats->tx_mpdu_retry += FIELD_GET(MT_TXS7_F1_MPDU_RETRY_COUNT, txs7);
-
 	txrate = FIELD_GET(MT_TXS0_TX_RATE, txs);
 
 	rate->mcs = FIELD_GET(MT_TX_RATE_IDX, txrate);
@@ -1425,6 +1418,19 @@ mt7915_mac_parse_txs(struct mt7915_dev *dev, struct mt76_wcid *wcid,
 		stats->tx_bw[0]++;
 		break;
 	}
+
+	if (FIELD_GET(MT_TXS0_TXS_FORMAT, txs) == 2) {
+		/* TXSFM == 10 */
+		u32 txs5, txs6, txs7;
+
+		txs5 = le32_to_cpu(txs_data[5]);
+		txs6 = le32_to_cpu(txs_data[6]);
+		txs7 = le32_to_cpu(txs_data[7]);
+
+		stats->tx_mpdu_attempts += FIELD_GET(MT_TXS5_F1_MPDU_TX_COUNT, txs5);
+		stats->tx_mpdu_fail += FIELD_GET(MT_TXS6_F1_MPDU_FAIL_COUNT, txs6);
+		stats->tx_mpdu_retry += FIELD_GET(MT_TXS7_F1_MPDU_RETRY_COUNT, txs7);
+	}
 }
 
 static void
@@ -1476,8 +1482,6 @@ static void mt7915_mac_add_txs(struct mt7915_dev *dev, void *data)
 	u8 pid;
 
 	txs = le32_to_cpu(txs_data[0]);
-	if (FIELD_GET(MT_TXS0_TXS_FORMAT, txs) > 1)
-		return;
 
 	txs = le32_to_cpu(txs_data[2]);
 	wcidx = FIELD_GET(MT_TXS2_WCID, txs);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.h b/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
index ccce994dc07a..986a65badd1b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
@@ -347,6 +347,9 @@ struct mt7915_tx_free {
 
 #define MT_TXS4_TIMESTAMP		GENMASK(31, 0)
 
+/* The F0 variables are for TXSFM 0x0 and 0x1.  The F1 variables
+ * are for TXSFM 0x2 aka PPDU format.
+ */
 #define MT_TXS5_F0_FINAL_MPDU		BIT(31)
 #define MT_TXS5_F0_QOS			BIT(30)
 #define MT_TXS5_F0_TX_COUNT		GENMASK(29, 25)
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 07/11] mt76: mt7915:  Add support for tx-overrides.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (4 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 06/11] mt76: mt7915: Support parsing TXSFM 0x2 greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 08/11] mt76: mt7915: Fix SGI reporting when using tx-overrides greearb
                   ` (3 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

Allow setting fix rate on transmit without using full testmode
logic.

txpower, dynbw, retry count is not currently supported.
And, probably later need additional logic to not apply this
txo to non-data frames and to smaller frames, to allow
ARP and such to go through while also forcing test data frames
to arbitrary tx-rates (rates which very well may not be
received by peer.)

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 drivers/net/wireless/mediatek/mt76/mt76.h     |   4 +
 .../wireless/mediatek/mt76/mt7915/debugfs.c   | 228 ++++++++++++++++++
 .../net/wireless/mediatek/mt76/mt7915/mac.c   |  97 ++++++--
 .../wireless/mediatek/mt76/mt7915/mt7915.h    |   2 +
 4 files changed, 305 insertions(+), 26 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index c06dc77a0895..877be9f423d2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -566,6 +566,7 @@ struct mt76_testmode_ops {
 
 struct mt76_testmode_data {
 	enum mt76_testmode_state state;
+	u8 txo_active; /* tx overrides are active */
 
 	u32 param_set[DIV_ROUND_UP(NUM_MT76_TM_ATTRS, 32)];
 	struct sk_buff *tx_skb;
@@ -580,6 +581,9 @@ struct mt76_testmode_data {
 	u8 tx_rate_ldpc;
 	u8 tx_rate_stbc;
 	u8 tx_ltf;
+	u8 txbw; /* specify TX bandwidth: 0 20Mhz, 1 40Mhz, 2 80Mhz, 3 160Mhz */
+	u8 tx_xmit_count; /* 0 means no-ack, 1 means one transmit, etc */
+	u8 tx_dynbw; /* 0:  dynamic bw disabled, 1: dynamic bw enabled */
 
 	u8 tx_antenna_mask;
 	u8 tx_spe_idx;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
index 6be194f16548..0a2c6f2c2dbc 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
@@ -109,6 +109,232 @@ mt7915_fw_debug_get(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(fops_fw_debug, mt7915_fw_debug_get,
 			 mt7915_fw_debug_set, "%lld\n");
 
+static ssize_t mt7915_read_set_rate_override(struct file *file,
+					     char __user *user_buf,
+					     size_t count, loff_t *ppos)
+{
+	struct mt7915_dev *dev = file->private_data;
+	struct mt7915_sta *msta;
+	struct ieee80211_vif *vif;
+	struct wireless_dev *wdev;
+	struct mt76_wcid *wcid;
+	struct mt7915_vif *mvif;
+	struct mt76_phy *mphy = &dev->mt76.phy;
+	char *buf2;
+	int size = 8000;
+	int rv, i, j, sofar;
+	const char buf[] =
+		"This allows specify specif tx rate parameters for all DATA frames on a vdev\n"
+		"To set a value, you specify the dev-name and key-value pairs:\n"
+		"tpc=10 sgi=1 mcs=x nss=x pream=x retries=x dynbw=0|1 bw=x enable=0|1\n"
+		"pream: 0=cck, 1=ofdm, 2=HT, 3=VHT, 4=HE_SU\n"
+		"cck-mcs: 0=1Mbps, 1=2Mbps, 3=5.5Mbps, 3=11Mbps\n"
+		"ofdm-mcs: 0=6Mbps, 1=9Mbps, 2=12Mbps, 3=18Mbps, 4=24Mbps, 5=36Mbps, 6=48Mbps, 7=54Mbps\n"
+		"tpc is not implemented currently, bw is 0-3 for 20-160\n"
+		" For example, wlan0:\n"
+		"echo \"wlan0 tpc=255 sgi=1 mcs=0 nss=1 pream=3 retries=1 dynbw=0 bw=0 active=1\" > ...mt76/set_rate_override\n";
+
+	buf2 = kzalloc(size, GFP_KERNEL);
+	if (!buf2)
+		return -ENOMEM;
+	strcpy(buf2, buf);
+	sofar = strlen(buf2);
+
+	mutex_lock(&mphy->dev->mutex);
+
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.wcid_mask); i++) {
+		u32 mask = dev->mt76.wcid_mask[i];
+		u32 phy_mask = dev->mt76.wcid_phy_mask[i];
+
+		if (!mask)
+			continue;
+
+		for (j = i * 32; mask; j++, mask >>= 1, phy_mask >>= 1) {
+			struct mt76_testmode_data *td;
+
+			if (!(mask & 1))
+				continue;
+
+			wcid = rcu_dereference(dev->mt76.wcid[j]);
+			if (!wcid)
+				continue;
+
+			msta = container_of(wcid, struct mt7915_sta, wcid);
+
+			if (msta->vif != mvif)
+				continue;
+
+			td = &msta->test;
+			vif = container_of((void *)msta->vif, struct ieee80211_vif, drv_priv);
+
+			wdev = ieee80211_vif_to_wdev(vif);
+
+			if (!wdev)
+				continue;
+
+			sofar += scnprintf(buf2 + sofar, size - sofar,
+					   "vdev %i(%s) active=%d tpc=%d sgi=%d mcs=%d nss=%d pream=%d retries=%d dynbw=%d bw=%d\n",
+					   j, wdev->netdev->name,
+					   td->txo_active, td->tx_power[0],
+					   td->tx_rate_sgi, td->tx_rate_idx,
+					   td->tx_rate_nss, td->tx_rate_mode,
+					   td->tx_xmit_count, td->tx_dynbw,
+					   td->txbw);
+			if (sofar >= size)
+				break;
+		}
+	}
+
+	mutex_unlock(&mphy->dev->mutex);
+
+	rv = simple_read_from_buffer(user_buf, count, ppos, buf2, sofar);
+	kfree(buf2);
+	return rv;
+}
+
+/* Set the rates for specific types of traffic.
+ */
+static ssize_t mt7915_write_set_rate_override(struct file *file,
+					      const char __user *user_buf,
+					      size_t count, loff_t *ppos)
+{
+	struct mt7915_dev *dev = file->private_data;
+	struct mt7915_sta *msta;
+	struct ieee80211_vif *vif;
+	struct mt76_testmode_data *td = NULL;
+	struct wireless_dev *wdev;
+	struct mt76_wcid *wcid;
+	struct mt76_phy *mphy = &dev->mt76.phy;
+	char buf[180];
+	char tmp[20];
+	char *tok;
+	int ret, i, j;
+	unsigned int vdev_id = 0xFFFF;
+	char *bufptr = buf;
+	long rc;
+	char dev_name_match[IFNAMSIZ + 2];
+
+	memset(buf, 0, sizeof(buf));
+
+	simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count);
+
+	/* make sure that buf is null terminated */
+	buf[sizeof(buf) - 1] = 0;
+
+	/* drop the possible '\n' from the end */
+	if (buf[count - 1] == '\n')
+		buf[count - 1] = 0;
+
+	mutex_lock(&mphy->dev->mutex);
+
+	/* Ignore empty lines, 'echo' appends them sometimes at least. */
+	if (buf[0] == 0) {
+		ret = count;
+		goto exit;
+	}
+
+	/* String starts with vdev name, ie 'wlan0'  Find the proper vif that
+	 * matches the name.
+	 */
+	for (i = 0; i < ARRAY_SIZE(dev->mt76.wcid_mask); i++) {
+		u32 mask = dev->mt76.wcid_mask[i];
+		u32 phy_mask = dev->mt76.wcid_phy_mask[i];
+
+		if (!mask)
+			continue;
+
+		for (j = i * 32; mask; j++, mask >>= 1, phy_mask >>= 1) {
+			if (!(mask & 1))
+				continue;
+
+			wcid = rcu_dereference(dev->mt76.wcid[j]);
+			if (!wcid)
+				continue;
+
+			msta = container_of(wcid, struct mt7915_sta, wcid);
+
+			vif = container_of((void *)msta->vif, struct ieee80211_vif, drv_priv);
+
+			wdev = ieee80211_vif_to_wdev(vif);
+
+			if (!wdev)
+				continue;
+
+			snprintf(dev_name_match, sizeof(dev_name_match) - 1, "%s ",
+				 wdev->netdev->name);
+
+			if (strncmp(dev_name_match, buf, strlen(dev_name_match)) == 0) {
+				vdev_id = j;
+				td = &msta->test;
+				bufptr = buf + strlen(dev_name_match) - 1;
+				break;
+			}
+		}
+	}
+
+	if (vdev_id == 0xFFFF) {
+		if (strstr(buf, "active=0")) {
+			/* Ignore, we are disabling it anyway */
+			ret = count;
+			goto exit;
+		} else {
+			pr_info("mt7915: set-rate-override, unknown netdev name: %s\n", buf);
+		}
+		ret = -EINVAL;
+		goto exit;
+	}
+
+#define MT7915_PARSE_LTOK(a, b)					\
+	do {								\
+		tok = strstr(bufptr, " " #a "=");			\
+		if (tok) {						\
+			char *tspace;					\
+			tok += 1; /* move past initial space */		\
+			strncpy(tmp, tok + strlen(#a "="), sizeof(tmp) - 1); \
+			tmp[sizeof(tmp) - 1] = 0;			\
+			tspace = strstr(tmp, " ");			\
+			if (tspace)					\
+				*tspace = 0;				\
+			if (kstrtol(tmp, 0, &rc) != 0)			\
+				pr_info("mt7915: set-rate-override: " #a \
+					"= could not be parsed, tmp: %s\n", \
+					tmp);				\
+			else						\
+				td->b = rc;				\
+		}							\
+	} while (0)
+
+	MT7915_PARSE_LTOK(tpc, tx_power[0]);
+	MT7915_PARSE_LTOK(sgi, tx_rate_sgi);
+	MT7915_PARSE_LTOK(mcs, tx_rate_idx);
+	MT7915_PARSE_LTOK(nss, tx_rate_nss);
+	MT7915_PARSE_LTOK(pream, tx_rate_mode);
+	MT7915_PARSE_LTOK(retries, tx_xmit_count);
+	MT7915_PARSE_LTOK(dynbw, tx_dynbw);
+	MT7915_PARSE_LTOK(bw, txbw);
+	MT7915_PARSE_LTOK(active, txo_active);
+
+	pr_info("mt7915: set-rate-overrides, vdev %i(%s) active=%d tpc=%d sgi=%d mcs=%d nss=%d pream=%d retries=%d dynbw=%d bw=%d\n",
+		vdev_id, dev_name_match,
+		td->txo_active, td->tx_power[0], td->tx_rate_sgi, td->tx_rate_idx,
+		td->tx_rate_nss, td->tx_rate_mode, td->tx_xmit_count, td->tx_dynbw,
+		td->txbw);
+
+	ret = count;
+
+exit:
+	mutex_unlock(&mphy->dev->mutex);
+	return ret;
+}
+
+static const struct file_operations fops_set_rate_override = {
+	.read = mt7915_read_set_rate_override,
+	.write = mt7915_write_set_rate_override,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
 static int
 mt7915_txs_for_no_skb_set(void *data, u64 val)
 {
@@ -377,6 +603,8 @@ int mt7915_init_debugfs(struct mt7915_dev *dev)
 	debugfs_create_file("ser_trigger", 0200, dir, dev, &fops_ser_trigger);
 	debugfs_create_devm_seqfile(dev->mt76.dev, "txpower_sku", dir,
 				    mt7915_read_rate_txpower);
+	debugfs_create_file("set_rate_override", 0600, dir,
+			    dev, &fops_set_rate_override);
 
 	return 0;
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 03c85bd0750e..23c9125e19c8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -757,21 +757,31 @@ mt7915_mac_fill_rx_vector(struct mt7915_dev *dev, struct sk_buff *skb)
 }
 
 static void
-mt7915_mac_write_txwi_tm(struct mt7915_phy *phy, __le32 *txwi,
+mt7915_mac_write_txwi_tm(struct mt7915_phy *phy, struct mt76_wcid *wcid, __le32 *txwi,
 			 struct sk_buff *skb)
 {
-#ifdef CONFIG_NL80211_TESTMODE
-	struct mt76_testmode_data *td = &phy->mt76->test;
+	struct mt76_testmode_data *td;
 	const struct ieee80211_rate *r;
-	u8 bw, mode, nss = td->tx_rate_nss;
-	u8 rate_idx = td->tx_rate_idx;
+	struct mt7915_sta *msta;
+	u8 bw, mode, nss;
+	u8 rate_idx;
 	u16 rateval = 0;
 	u32 val;
 	bool cck = false;
 	int band;
 
-	if (skb != phy->mt76->test.tx_skb)
-		return;
+	msta = container_of(wcid, struct mt7915_sta, wcid);
+
+	if (msta->test.txo_active) {
+		td = &msta->test;
+	} else {
+		if (skb != phy->mt76->test.tx_skb)
+			return;
+		td = &phy->mt76->test;
+	}
+
+	nss = td->tx_rate_nss;
+	rate_idx = td->tx_rate_idx;
 
 	switch (td->tx_rate_mode) {
 	case MT76_TM_TX_MODE_HT:
@@ -812,20 +822,24 @@ mt7915_mac_write_txwi_tm(struct mt7915_phy *phy, __le32 *txwi,
 		break;
 	}
 
-	switch (phy->mt76->chandef.width) {
-	case NL80211_CHAN_WIDTH_40:
-		bw = 1;
-		break;
-	case NL80211_CHAN_WIDTH_80:
-		bw = 2;
-		break;
-	case NL80211_CHAN_WIDTH_80P80:
-	case NL80211_CHAN_WIDTH_160:
-		bw = 3;
-		break;
-	default:
-		bw = 0;
-		break;
+	if (msta->test.txo_active) {
+		bw = td->txbw;
+	} else {
+		switch (phy->mt76->chandef.width) {
+		case NL80211_CHAN_WIDTH_40:
+			bw = 1;
+			break;
+		case NL80211_CHAN_WIDTH_80:
+			bw = 2;
+			break;
+		case NL80211_CHAN_WIDTH_80P80:
+		case NL80211_CHAN_WIDTH_160:
+			bw = 3;
+			break;
+		default:
+			bw = 0;
+			break;
+		}
 	}
 
 	if (td->tx_rate_stbc && nss == 1) {
@@ -837,12 +851,17 @@ mt7915_mac_write_txwi_tm(struct mt7915_phy *phy, __le32 *txwi,
 		   FIELD_PREP(MT_TX_RATE_MODE, mode) |
 		   FIELD_PREP(MT_TX_RATE_NSS, nss - 1);
 
+	/* TODO:  Support per-skb txpower, p.15 of txpower doc, DW2 29:24. */
 	txwi[2] |= cpu_to_le32(MT_TXD2_FIX_RATE);
 
+	/* Looks like this sets tx attempt to exactly 1.
+	 * TODO:  Use td->tx_xmit_count, if in txo mode.
+	 */
 	le32p_replace_bits(&txwi[3], 1, MT_TXD3_REM_TX_COUNT);
 	if (td->tx_rate_mode < MT76_TM_TX_MODE_HT)
 		txwi[3] |= cpu_to_le32(MT_TXD3_BA_DISABLE);
 
+	/* TODO:  Take tx_dynbw into account in txo mode. */
 	val = MT_TXD6_FIXED_BW |
 	      FIELD_PREP(MT_TXD6_BW, bw) |
 	      FIELD_PREP(MT_TXD6_TX_RATE, rateval) |
@@ -866,9 +885,28 @@ mt7915_mac_write_txwi_tm(struct mt7915_phy *phy, __le32 *txwi,
 
 	txwi[3] &= ~cpu_to_le32(MT_TXD3_SN_VALID);
 	txwi[6] |= cpu_to_le32(val);
-	txwi[7] |= cpu_to_le32(FIELD_PREP(MT_TXD7_SPE_IDX,
-					  phy->test.spe_idx));
-#endif
+	if (msta->test.txo_active) {
+		/* see mt7915_tm_set_tx_frames */
+		static const u8 spe_idx_map[] = {0, 0, 1, 0, 3, 2, 4, 0,
+						 9, 8, 6, 10, 16, 12, 18, 0};
+		u32 spe_idx;
+
+		if (td->tx_spe_idx) {
+			spe_idx = td->tx_spe_idx;
+		} else {
+			u8 tx_ant = td->tx_antenna_mask;
+
+			if (!tx_ant) {
+				/* use antenna mask that matches our nss */
+				tx_ant = GENMASK(nss - 1, 0);
+			}
+			spe_idx = spe_idx_map[tx_ant];
+		}
+		txwi[7] |= cpu_to_le32(FIELD_PREP(MT_TXD7_SPE_IDX, spe_idx));
+	} else {
+		txwi[7] |= cpu_to_le32(FIELD_PREP(MT_TXD7_SPE_IDX,
+						  phy->test.spe_idx));
+	}
 }
 
 static void
@@ -1078,8 +1116,15 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
 		txwi[3] |= cpu_to_le32(MT_TXD3_BA_DISABLE);
 	}
 
-	if (mt76_testmode_enabled(mphy))
-		mt7915_mac_write_txwi_tm(mphy->priv, txwi, skb);
+#ifdef CONFIG_NL80211_TESTMODE
+	{
+		struct mt7915_sta *msta;
+
+		msta = container_of(wcid, struct mt7915_sta, wcid);
+		if (mt76_testmode_enabled(mphy) || msta->test.txo_active)
+			mt7915_mac_write_txwi_tm(mphy->priv, wcid, txwi, skb);
+	}
+#endif
 }
 
 int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
index cd5954de1686..8c5339ef5cf9 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
@@ -95,6 +95,8 @@ struct mt7915_sta {
 	struct mt7915_sta_stats stats;
 
 	struct mt7915_sta_key_conf bip;
+
+	struct mt76_testmode_data test;
 };
 
 struct mt7915_vif {
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 08/11] mt76: mt7915:  Fix SGI reporting when using tx-overrides.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (5 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 07/11] mt76: mt7915: Add support for tx-overrides greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 09/11] mt76: mt7915: txfree status to show txcount instead of latency greearb
                   ` (2 subsequent siblings)
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

The station wtbl logic to read rate-ctrl settings does not work when
fixed rates are used.  So, read sgi settings from the txo configuration
in this case.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 23c9125e19c8..74f567393656 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -176,6 +176,15 @@ static void mt7915_mac_sta_poll(struct mt7915_dev *dev)
 						       rx_cur);
 		}
 
+		/* If we are in tx-override mode, then wtbl doesn't provide useful report
+		 * for the SGI/LGI stuff, so just get it from the override struct.
+		 */
+		if (msta->test.txo_active) {
+			msta->wcid.rate_he_gi = msta->test.tx_rate_sgi;
+			msta->wcid.rate_short_gi = msta->test.tx_rate_sgi;
+			continue;
+		}
+
 		/*
 		 * We don't support reading GI info from txs packets.
 		 * For accurate tx status reporting and AQL improvement,
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 09/11] mt76: mt7915:  txfree status to show txcount instead of latency.
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (6 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 08/11] mt76: mt7915: Fix SGI reporting when using tx-overrides greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 10/11] mt76: mt7915: Report tx-retries greearb
  2021-07-23 16:06 ` [PATCH v3 11/11] mt76: mt7915: add a missing HT flag for GI parsing greearb
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

Latency is not obviously that useful, but txcount can let us deduce
retries, which may be more interesting.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/init.c | 3 +++
 drivers/net/wireless/mediatek/mt76/mt7915/mac.h  | 8 +++++---
 drivers/net/wireless/mediatek/mt76/mt7915/regs.h | 4 ++++
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index f174cf219724..a0d282771d77 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -304,6 +304,9 @@ static void mt7915_mac_init(struct mt7915_dev *dev)
 	/* enable hardware de-agg */
 	mt76_set(dev, MT_MDP_DCR0, MT_MDP_DCR0_DAMSDU_EN);
 
+	/* disable Tx latency report to enable Tx count in txfree path */
+	mt76_clear(dev, MT_PLE_HOST_RPT0, MT_PLE_HOST_RPT0_TX_LATENCY);
+
 	for (i = 0; i < MT7915_WTBL_SIZE; i++)
 		mt7915_mac_wtbl_update(dev, i,
 				       MT_WTBL_UPDATE_ADM_COUNT_CLEAR);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.h b/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
index 986a65badd1b..741d51b0fa06 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
@@ -304,13 +304,15 @@ struct mt7915_tx_free {
 
 #define MT_TX_FREE_MSDU_CNT		GENMASK(9, 0)
 #define MT_TX_FREE_WLAN_ID		GENMASK(23, 14)
+/* when configured for txfree latency mode.  See MT_PLE_HOST_RPT0_TX_LATENCY
+ * Not enabled by default now.
+ */
 #define MT_TX_FREE_LATENCY		GENMASK(12, 0)
-/* 0: success, others: dropped */
+/* when configured for txcount mode.  See MT_PLE_HOST_RPT0_TX_LATENCY. */
+#define MT_TX_FREE_TXCNT		GENMASK(12, 0)
 #define MT_TX_FREE_STATUS		GENMASK(14, 13)
 #define MT_TX_FREE_MSDU_ID		GENMASK(30, 16)
 #define MT_TX_FREE_PAIR			BIT(31)
-/* will support this field in further revision */
-#define MT_TX_FREE_RATE			GENMASK(13, 0)
 
 #define MT_TXS0_FIXED_RATE		BIT(31)
 #define MT_TXS0_BW			GENMASK(30, 29)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/regs.h b/drivers/net/wireless/mediatek/mt76/mt7915/regs.h
index 62cc32a098fc..ac4d233b8cf2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/regs.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/regs.h
@@ -22,6 +22,10 @@
 #define MT_PLE_BASE			0x8000
 #define MT_PLE(ofs)			(MT_PLE_BASE + (ofs))
 
+/* Modify whether txfree struct returns latency or txcount. */
+#define MT_PLE_HOST_RPT0               MT_PLE(0x030)
+#define MT_PLE_HOST_RPT0_TX_LATENCY    BIT(3)
+
 #define MT_PLE_FL_Q0_CTRL		MT_PLE(0x1b0)
 #define MT_PLE_FL_Q1_CTRL		MT_PLE(0x1b4)
 #define MT_PLE_FL_Q2_CTRL		MT_PLE(0x1b8)
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 10/11] mt76: mt7915:  Report tx-retries
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (7 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 09/11] mt76: mt7915: txfree status to show txcount instead of latency greearb
@ 2021-07-23 16:06 ` greearb
  2021-07-23 16:06 ` [PATCH v3 11/11] mt76: mt7915: add a missing HT flag for GI parsing greearb
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ben Greear

From: Ben Greear <greearb@candelatech.com>

mac80211 stack will only report tx-status for skb claiming to be ampdu heads,
so lie a bit in mt7915 and set the flag so that mac80211 will record status
for each skb.

mt7915 appears to report retry status on an individual per-skb manner,
so that method above seems to work.

Re-constitute the txinfo status rate info so that the rix and flags
is also at least close to correct.  No direct way to report HE
rates that way, so mac80211 might could use some tweaking in
the ieee80211_tx_status_ext to take both info and status->rate
into account.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 .../net/wireless/mediatek/mt76/mt7915/init.c  |  1 +
 .../net/wireless/mediatek/mt76/mt7915/mac.c   | 82 +++++++++++++++++--
 .../net/wireless/mediatek/mt76/mt7915/mac.h   |  4 +-
 drivers/net/wireless/mediatek/mt76/tx.c       |  6 +-
 4 files changed, 86 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index a0d282771d77..9dc7a67dd76f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -217,6 +217,7 @@ mt7915_init_wiphy(struct ieee80211_hw *hw)
 	struct wiphy *wiphy = hw->wiphy;
 
 	hw->queues = 4;
+	hw->max_report_rates = 1;
 	hw->max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 	hw->max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 	hw->netdev_features = NETIF_F_RXCSUM;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 74f567393656..bef116445119 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1257,17 +1257,22 @@ mt7915_txp_skb_unmap(struct mt76_dev *dev, struct mt76_txwi_cache *t)
 
 static void
 mt7915_txwi_free(struct mt7915_dev *dev, struct mt76_txwi_cache *t,
-		 struct ieee80211_sta *sta, struct list_head *free_list)
+		 struct ieee80211_sta *sta, struct list_head *free_list,
+		 u32 tx_cnt, u32 tx_status, u32 ampdu)
 {
 	struct mt76_dev *mdev = &dev->mt76;
 	struct mt76_wcid *wcid;
 	__le32 *txwi;
 	u16 wcid_idx;
+	struct ieee80211_tx_info *info;
+	struct ieee80211_tx_rate *rate;
 
 	mt7915_txp_skb_unmap(mdev, t);
 	if (!t->skb)
 		goto out;
 
+	rcu_read_lock(); /* protect wcid access */
+
 	txwi = (__le32 *)mt76_get_txwi_ptr(mdev, t);
 	if (sta) {
 		wcid = (struct mt76_wcid *)sta->drv_priv;
@@ -1277,6 +1282,64 @@ mt7915_txwi_free(struct mt7915_dev *dev, struct mt76_txwi_cache *t,
 			mt7915_tx_check_aggr(sta, txwi);
 	} else {
 		wcid_idx = FIELD_GET(MT_TXD1_WLAN_IDX, le32_to_cpu(txwi[1]));
+		wcid = rcu_dereference(mdev->wcid[wcid_idx]);
+	}
+
+	info = IEEE80211_SKB_CB(t->skb);
+
+	/* Cannot clear all of info->status, we need the driver private
+	 * status intact.
+	 */
+	info->status.is_valid_ack_signal = 0;
+
+	rate = &info->status.rates[0];
+	rate->idx = -1; /* will over-write below if we found wcid */
+	info->status.rates[1].idx = -1; /* terminate rate list */
+
+	/* force TX_STAT_AMPDU to be set, or mac80211 will ignore status */
+	if (ampdu || (info->flags & IEEE80211_TX_CTL_AMPDU)) {
+		info->flags |= IEEE80211_TX_STAT_AMPDU | IEEE80211_TX_CTL_AMPDU;
+		info->status.ampdu_len = 1;
+	}
+
+	/* update info status based on cached wcid rate info since
+	 * txfree path doesn't give us a lot of info.
+	 */
+	if (wcid) {
+		if (wcid->rate.flags & RATE_INFO_FLAGS_MCS) {
+			rate->flags |= IEEE80211_TX_RC_MCS;
+			rate->idx = wcid->rate.mcs + wcid->rate.nss * 8;
+		} else if (wcid->rate.flags & RATE_INFO_FLAGS_VHT_MCS) {
+			rate->flags |= IEEE80211_TX_RC_VHT_MCS;
+			rate->idx = (wcid->rate.nss << 4) | wcid->rate.mcs;
+		} else if (wcid->rate.flags & RATE_INFO_FLAGS_HE_MCS) {
+			rate->idx = (wcid->rate.nss << 4) | wcid->rate.mcs;
+		} else {
+			rate->idx = wcid->rate.mcs;
+		}
+
+		switch (wcid->rate.bw) {
+		case RATE_INFO_BW_160:
+			rate->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
+			break;
+		case RATE_INFO_BW_80:
+			rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
+			break;
+		case RATE_INFO_BW_40:
+			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
+			break;
+		}
+	}
+
+	rcu_read_unlock();
+
+	/* Apply the values that this txfree path reports */
+	rate->count = tx_cnt;
+	if (tx_status == 0) {
+		info->flags |= IEEE80211_TX_STAT_ACK;
+		info->status.ampdu_ack_len = 1;
+	} else {
+		info->flags &= ~IEEE80211_TX_STAT_ACK;
 	}
 
 	__mt76_tx_complete_skb(mdev, wcid_idx, t->skb, free_list);
@@ -1296,7 +1359,8 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb)
 	struct ieee80211_sta *sta = NULL;
 	LIST_HEAD(free_list);
 	struct sk_buff *tmp;
-	u8 i, count;
+	u8 i;
+	u16 count;
 	bool wake = false;
 
 	/* clean DMA queues and unmap buffers first */
@@ -1312,9 +1376,12 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb)
 	 * to the time ack is received or dropped by hw (air + hw queue time).
 	 * Should avoid accessing WTBL to get Tx airtime, and use it instead.
 	 */
+	/* free->ctrl is high u16 of first DW in the txfree struct */
 	count = FIELD_GET(MT_TX_FREE_MSDU_CNT, le16_to_cpu(free->ctrl));
 	for (i = 0; i < count; i++) {
-		u32 msdu, info = le32_to_cpu(free->info[i]);
+		u32 msdu, tx_cnt, tx_status;
+		u32 info = le32_to_cpu(free->info[i]); /* DW3+ */
+		u32 ampdu;
 
 		/*
 		 * 1'b1: new wcid pair.
@@ -1345,7 +1412,12 @@ mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb)
 		if (!txwi)
 			continue;
 
-		mt7915_txwi_free(dev, txwi, sta, &free_list);
+		tx_cnt = FIELD_GET(MT_TX_FREE_TXCNT, info);
+		/* 0 = success, 1 dropped-by-hw, 2 dropped-by-cpu */
+		tx_status = FIELD_GET(MT_TX_FREE_STATUS, info);
+		ampdu = FIELD_GET(MT_TX_FREE_HEAD_OF_PAGE, info);
+
+		mt7915_txwi_free(dev, txwi, sta, &free_list, tx_cnt, tx_status, ampdu);
 	}
 
 	mt7915_mac_sta_poll(dev);
@@ -1883,7 +1955,7 @@ void mt7915_tx_token_put(struct mt7915_dev *dev)
 
 	spin_lock_bh(&dev->mt76.token_lock);
 	idr_for_each_entry(&dev->mt76.token, txwi, id) {
-		mt7915_txwi_free(dev, txwi, NULL, NULL);
+		mt7915_txwi_free(dev, txwi, NULL, NULL, 0, 1, 0);
 		dev->mt76.token_count--;
 	}
 	spin_unlock_bh(&dev->mt76.token_lock);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.h b/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
index 741d51b0fa06..3f8fbed144df 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.h
@@ -299,7 +299,7 @@ struct mt7915_tx_free {
 	__le16 ctrl;
 	u8 txd_cnt;
 	u8 rsv[3];
-	__le32 info[];
+	__le32 info[]; /* DW3+ */
 } __packed __aligned(4);
 
 #define MT_TX_FREE_MSDU_CNT		GENMASK(9, 0)
@@ -311,6 +311,8 @@ struct mt7915_tx_free {
 /* when configured for txcount mode.  See MT_PLE_HOST_RPT0_TX_LATENCY. */
 #define MT_TX_FREE_TXCNT		GENMASK(12, 0)
 #define MT_TX_FREE_STATUS		GENMASK(14, 13)
+/* 0:  not MPDU, 1:  MSDU is head pkt of TXD page (MPDU) */
+#define MT_TX_FREE_HEAD_OF_PAGE		BIT(15)
 #define MT_TX_FREE_MSDU_ID		GENMASK(30, 16)
 #define MT_TX_FREE_PAIR			BIT(31)
 
diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 730f37aede3a..7ab7ea63fa52 100644
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -263,6 +263,7 @@ void __mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *
 	struct ieee80211_tx_status status = {
 		.skb = skb,
 		.free_list = free_list,
+		.info = IEEE80211_SKB_CB(skb),
 	};
 	struct mt76_wcid *wcid = NULL;
 	struct ieee80211_hw *hw;
@@ -270,8 +271,11 @@ void __mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *
 
 	rcu_read_lock();
 
-	if (wcid_idx < ARRAY_SIZE(dev->wcid))
+	if (wcid_idx < ARRAY_SIZE(dev->wcid)) {
 		wcid = rcu_dereference(dev->wcid[wcid_idx]);
+		if (wcid)
+			status.rate = &wcid->rate;
+	}
 
 	mt76_tx_check_non_aql(dev, wcid, skb);
 
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

* [PATCH v3 11/11] mt76: mt7915: add a missing HT flag for GI parsing
  2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
                   ` (8 preceding siblings ...)
  2021-07-23 16:06 ` [PATCH v3 10/11] mt76: mt7915: Report tx-retries greearb
@ 2021-07-23 16:06 ` greearb
  9 siblings, 0 replies; 11+ messages in thread
From: greearb @ 2021-07-23 16:06 UTC (permalink / raw)
  To: linux-wireless; +Cc: Ryder Lee

From: Ryder Lee <ryder.lee@mediatek.com>

The previous commit missed a HT flag.

Fixes: 14b220c07188 ("mt76: mt7915: report tx rate directly from tx status")
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index bef116445119..77620404ab7a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -215,7 +215,8 @@ static void mt7915_mac_sta_poll(struct mt7915_dev *dev)
 
 			rate->he_gi = (val & (0x3 << offs)) >> offs;
 			msta->wcid.rate_he_gi = rate->he_gi; /* cache for later */
-		} else if (rate->flags & RATE_INFO_FLAGS_VHT_MCS) {
+		} else if (rate->flags &
+			   (RATE_INFO_FLAGS_VHT_MCS | RATE_INFO_FLAGS_MCS)) {
 			if (val & BIT(12 + bw)) {
 				rate->flags |= RATE_INFO_FLAGS_SHORT_GI;
 				msta->wcid.rate_short_gi = 1;
@@ -224,7 +225,6 @@ static void mt7915_mac_sta_poll(struct mt7915_dev *dev)
 				msta->wcid.rate_short_gi = 0;
 			}
 		}
-		/* TODO:  Deal with HT_MCS */
 	}
 
 	rcu_read_unlock();
-- 
2.20.1


^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2021-07-23 16:07 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-23 16:06 [PATCH v3 01/11] mt76: add hash lookup for skb on TXS status_list greearb
2021-07-23 16:06 ` [PATCH v3 02/11] mt76 - mt7915: Fix potential NPE in TXS processing greearb
2021-07-23 16:06 ` [PATCH v3 03/11] mt76 - mt7915: Move TXS parsing to its own method greearb
2021-07-23 16:06 ` [PATCH v3 04/11] mt76 - mt7915: Allow processing TXS for 'NO_SKB' pkt-ids greearb
2021-07-23 16:06 ` [PATCH v3 05/11] mt76: mt7915: debugfs hook to enable TXS for NO_SKB pkt-ids greearb
2021-07-23 16:06 ` [PATCH v3 06/11] mt76: mt7915: Support parsing TXSFM 0x2 greearb
2021-07-23 16:06 ` [PATCH v3 07/11] mt76: mt7915: Add support for tx-overrides greearb
2021-07-23 16:06 ` [PATCH v3 08/11] mt76: mt7915: Fix SGI reporting when using tx-overrides greearb
2021-07-23 16:06 ` [PATCH v3 09/11] mt76: mt7915: txfree status to show txcount instead of latency greearb
2021-07-23 16:06 ` [PATCH v3 10/11] mt76: mt7915: Report tx-retries greearb
2021-07-23 16:06 ` [PATCH v3 11/11] mt76: mt7915: add a missing HT flag for GI parsing greearb

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