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_etop.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_etop.c')
| -rw-r--r-- | drivers/net/ethernet/lantiq_etop.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c index 62f8c5212182..2258e3f19161 100644 --- a/drivers/net/ethernet/lantiq_etop.c +++ b/drivers/net/ethernet/lantiq_etop.c @@ -96,6 +96,9 @@ struct ltq_etop_priv { struct ltq_etop_chan ch[MAX_DMA_CHAN]; int tx_free[MAX_DMA_CHAN >> 1]; + int tx_burst_len; + int rx_burst_len; + spinlock_t lock; }; @@ -259,7 +262,7 @@ ltq_etop_hw_init(struct net_device *dev) /* enable crc generation */ ltq_etop_w32(PPE32_CGEN, LQ_PPE32_ENET_MAC_CFG); - ltq_dma_init_port(DMA_PORT_ETOP); + ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, rx_burst_len); for (i = 0; i < MAX_DMA_CHAN; i++) { int irq = LTQ_DMA_CH0_INT + i; @@ -472,8 +475,8 @@ ltq_etop_tx(struct sk_buff *skb, struct net_device *dev) 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); ch->skb[ch->dma.desc] = skb; netif_trans_update(dev); @@ -667,6 +670,18 @@ ltq_etop_probe(struct platform_device *pdev) 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; + } + for (i = 0; i < MAX_DMA_CHAN; i++) { if (IS_TX(i)) netif_napi_add(dev, &priv->ch[i].napi, |