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Diffstat (limited to 'target/linux/lantiq/patches-5.15/0710-v5.16-net-lantiq-configure-the-burst-length-in-ethernet-dr.patch')
-rw-r--r--target/linux/lantiq/patches-5.15/0710-v5.16-net-lantiq-configure-the-burst-length-in-ethernet-dr.patch126
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..4fb7d0767b
--- /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;
+@@ -584,6 +587,18 @@ 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)