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From:   greearb@candelatech.com
To:     linux-wireless@vger.kernel.org
Cc:     nbd@nbd.name, Ben Greear <greearb@candelatech.com>
Subject: [PATCH 01/12] wifi: mt76: mt7915: cache sgi in wcid.
Date:   Wed, 27 Jul 2022 16:01:11 -0700
Message-Id: <20220727230122.29842-1-greearb@candelatech.com>
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From: Ben Greear <greearb@candelatech.com>

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>
---

These patches have mostly been posted before.  They are now rebased on
top of latest 5.19 upstream kernel.  Checkpatch has been run on them,
some patches have been merged, a few dropped per previous requests.
Lightly tested on 5.19, similar code was well tested on 5.17.

 drivers/net/wireless/mediatek/mt76/mt76.h       |  5 +++++
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 15 +++++++++++----
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 4e8997c45c1b..f994d1e18ac6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -272,7 +272,12 @@ 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() */
 
 	u16 idx;
 	u8 hw_key_idx;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index 46fc07877b7d..62a2dc47938e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -206,12 +206,16 @@ 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 | RATE_INFO_FLAGS_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;
+			}
 		}
 	}
 
@@ -1667,7 +1671,7 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 			goto out;
 
 		rate.flags = RATE_INFO_FLAGS_MCS;
-		if (wcid->rate.flags & RATE_INFO_FLAGS_SHORT_GI)
+		if (wcid->rate_short_gi)
 			rate.flags |= RATE_INFO_FLAGS_SHORT_GI;
 		break;
 	case MT_PHY_TYPE_VHT:
@@ -1675,6 +1679,8 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 			goto out;
 
 		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:
@@ -1683,11 +1689,12 @@ mt7915_mac_add_txs_skb(struct mt7915_dev *dev, struct mt76_wcid *wcid, int pid,
 		if (rate.mcs > 11)
 			goto out;
 
-		rate.he_gi = wcid->rate.he_gi;
+		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:
+		WARN_ON_ONCE(true);
 		goto out;
 	}
 
-- 
2.20.1