kernel/lantiq: Restore kernel files for v5.15

This is an automatically generated commit which aids following Kernel patch
history, as git will see the move and copy as a rename thus defeating the
purpose.

For the original discussion see:
https://lists.openwrt.org/pipermail/openwrt-devel/2023-October/041673.html

Signed-off-by: Martin Schiller <ms@dev.tdt.de>

1 files changed, 126 insertions, 0 deletions

diff --git a/target/linux/lantiq/patches-5.15/0710-v5.16-net-lantiq-configure-the-burst-length-in-ethernet-dr.patch b/target/linux/lantiq/patches-5.15/0710-v5.16-net-lantiq-configure-the-burst-length-in-ethernet-dr.patch
new file mode 100644
index 0000000000..818fa811e9
--- /dev/null
+++ b/target/linux/lantiq/patches-5.15/0710-v5.16-net-lantiq-configure-the-burst-length-in-ethernet-dr.patch
@@ -0,0 +1,126 @@
+From 14d4e308e0aa0b78dc7a059716861a4380de3535 Mon Sep 17 00:00:00 2001
+From: Aleksander Jan Bajkowski <olek2@wp.pl>
+Date: Tue, 14 Sep 2021 23:21:02 +0200
+Subject: [PATCH 5/5] net: lantiq: configure the burst length in ethernet
+ drivers
+
+Configure the burst length in Ethernet drivers. This improves
+Ethernet performance by 58%. According to the vendor BSP,
+8W burst length is supported by ar9 and newer SoCs.
+
+The NAT benchmark results on xRX200 (Down/Up):
+* 2W: 330 Mb/s
+* 4W: 432 Mb/s    372 Mb/s
+* 8W: 520 Mb/s    389 Mb/s
+
+Tested on xRX200 and xRX330.
+
+Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/lantiq_etop.c   | 21 ++++++++++++++++++---
+ drivers/net/ethernet/lantiq_xrx200.c | 21 ++++++++++++++++++---
+ 2 files changed, 36 insertions(+), 6 deletions(-)
+
+--- a/drivers/net/ethernet/lantiq_etop.c
++++ b/drivers/net/ethernet/lantiq_etop.c
+@@ -148,6 +148,9 @@ struct ltq_etop_priv {
+ 	struct ltq_etop_chan txch;
+ 	struct ltq_etop_chan rxch;
+ 
++	int tx_burst_len;
++	int rx_burst_len;
++
+ 	int tx_irq;
+ 	int rx_irq;
+ 
+@@ -399,7 +402,7 @@ ltq_etop_dma_init(struct net_device *dev
+ 	int rx = priv->rx_irq - LTQ_DMA_ETOP;
+ 	int err;
+ 
+-	ltq_dma_init_port(DMA_PORT_ETOP);
++	ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, rx_burst_len);
+ 
+ 	priv->txch.dma.nr = tx;
+ 	priv->txch.dma.dev = &priv->pdev->dev;
+@@ -676,8 +679,8 @@ ltq_etop_tx(struct sk_buff *skb, struct
+ 		return NETDEV_TX_BUSY;
+ 	}
+ 
+-	/* dma needs to start on a 16 byte aligned address */
+-	byte_offset = CPHYSADDR(skb->data) % 16;
++	/* dma needs to start on a burst length value aligned address */
++	byte_offset = CPHYSADDR(skb->data) % (priv->tx_burst_len * 4);
+ 	priv->txch.skb[priv->txch.dma.desc] = skb;
+ 
+ 	netif_trans_update(dev);
+@@ -925,6 +928,18 @@ static int ltq_etop_probe(struct platfor
+ 	spin_lock_init(&priv->lock);
+ 	SET_NETDEV_DEV(dev, &pdev->dev);
+ 
++	err = device_property_read_u32(&pdev->dev, "lantiq,tx-burst-length", &priv->tx_burst_len);
++	if (err < 0) {
++		dev_err(&pdev->dev, "unable to read tx-burst-length property\n");
++		return err;
++	}
++
++	err = device_property_read_u32(&pdev->dev, "lantiq,rx-burst-length", &priv->rx_burst_len);
++	if (err < 0) {
++		dev_err(&pdev->dev, "unable to read rx-burst-length property\n");
++		return err;
++	}
++
+ 	netif_napi_add(dev, &priv->txch.napi, ltq_etop_poll_tx, 8);
+ 	netif_napi_add(dev, &priv->rxch.napi, ltq_etop_poll_rx, 32);
+ 	priv->txch.netdev = dev;
+--- a/drivers/net/ethernet/lantiq_xrx200.c
++++ b/drivers/net/ethernet/lantiq_xrx200.c
+@@ -81,6 +81,9 @@ struct xrx200_priv {
+ 	struct net_device *net_dev;
+ 	struct device *dev;
+ 
++	int tx_burst_len;
++	int rx_burst_len;
++
+ 	__iomem void *pmac_reg;
+ };
+ 
+@@ -363,8 +366,8 @@ static netdev_tx_t xrx200_start_xmit(str
+ 	if (unlikely(dma_mapping_error(priv->dev, mapping)))
+ 		goto err_drop;
+ 
+-	/* dma needs to start on a 16 byte aligned address */
+-	byte_offset = mapping % 16;
++	/* dma needs to start on a burst length value aligned address */
++	byte_offset = mapping % (priv->tx_burst_len * 4);
+ 
+ 	desc->addr = mapping - byte_offset;
+ 	/* Make sure the address is written before we give it to HW */
+@@ -465,7 +468,7 @@ static int xrx200_dma_init(struct xrx200
+ 	int ret = 0;
+ 	int i;
+ 
+-	ltq_dma_init_port(DMA_PORT_ETOP);
++	ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, rx_burst_len);
+ 
+ 	ch_rx->dma.nr = XRX200_DMA_RX;
+ 	ch_rx->dma.dev = priv->dev;
+@@ -575,6 +578,18 @@ static int xrx200_probe(struct platform_
+ 	if (err)
+ 		eth_hw_addr_random(net_dev);
+ 
++	err = device_property_read_u32(dev, "lantiq,tx-burst-length", &priv->tx_burst_len);
++	if (err < 0) {
++		dev_err(dev, "unable to read tx-burst-length property\n");
++		return err;
++	}
++
++	err = device_property_read_u32(dev, "lantiq,rx-burst-length", &priv->rx_burst_len);
++	if (err < 0) {
++		dev_err(dev, "unable to read rx-burst-length property\n");
++		return err;
++	}
++
+ 	/* bring up the dma engine and IP core */
+ 	err = xrx200_dma_init(priv);
+ 	if (err)