diff options
| author | Aleksander Jan Bajkowski <olek2@wp.pl> | 2021-09-14 23:21:02 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-09-15 11:02:01 +0100 |
| commit | 14d4e308e0aa0b78dc7a059716861a4380de3535 (patch) | |
| tree | 9a0ef4a502af4904b7cf29fe4b6681ff0594dadb /drivers/net/ethernet/lantiq_xrx200.c | |
| parent | 49293bbc50cb7d44223eb49e0f7cb38e7dac2361 (diff) | |
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>
Diffstat (limited to 'drivers/net/ethernet/lantiq_xrx200.c')
| -rw-r--r-- | drivers/net/ethernet/lantiq_xrx200.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index fb78f17d734f..5d96248ce83b 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -71,6 +71,9 @@ struct xrx200_priv { struct net_device *net_dev; struct device *dev; + int tx_burst_len; + int rx_burst_len; + __iomem void *pmac_reg; }; @@ -316,8 +319,8 @@ static netdev_tx_t xrx200_start_xmit(struct sk_buff *skb, 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 */ @@ -369,7 +372,7 @@ static int xrx200_dma_init(struct xrx200_priv *priv) 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; @@ -478,6 +481,18 @@ static int xrx200_probe(struct platform_device *pdev) 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) |