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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 v7 3/5] mt76: mt76x02: remove a copy call for usb speedup
Date:   Wed, 20 Nov 2019 23:28:24 +0100
Message-Id: <20191120222826.14871-4-markus.theil@tu-ilmenau.de>
In-Reply-To: <20191120222826.14871-1-markus.theil@tu-ilmenau.de>
References: <20191120222826.14871-1-markus.theil@tu-ilmenau.de>
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This patch removes a mt76_wr_copy call from the beacon path to hw.
The skb which is used in this place gets therefore build with txwi
inside its data. For mt76 usb drivers, this saves one synchronuous
copy call over usb, which lets the beacon work complete faster.

In mmio case, there is not enough headroom to put the txwi into the
skb, it is therefore using an additional mt76_wr_copy, which is fast
over mmio. Thanks Stanislaw for pointing this out.

Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
---
 drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c b/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c
index 50e68af63d4f..060f0fc7a563 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_beacon.c
@@ -26,7 +26,6 @@ static int
 mt76x02_write_beacon(struct mt76x02_dev *dev, int offset, struct sk_buff *skb)
 {
 	int beacon_len = dev->beacon_ops->slot_size;
-	struct mt76x02_txwi txwi;
 
 	if (WARN_ON_ONCE(beacon_len < skb->len + sizeof(struct mt76x02_txwi)))
 		return -ENOSPC;
@@ -44,6 +43,7 @@ mt76x02_write_beacon(struct mt76x02_dev *dev, int offset, struct sk_buff *skb)
 	} else {
 		struct mt76x02_txwi txwi;
 
+		mt76x02_mac_write_txwi(dev, &txwi, skb, NULL, NULL, skb->len);
 		mt76_wr_copy(dev, offset, &txwi, sizeof(txwi));
 		offset += sizeof(txwi);
 	}
-- 
2.24.0