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amd-xgbe: Adjust register settings to improve performance

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Add support to change some general performance settings and to provide
some performance settings based on the device that is probed.

This includes:

- Setting the maximum read/write outstanding request limit
- Reducing the AXI interface burst length size
- Selectively setting the Tx and Rx descriptor pre-fetch threshold
- Selectively setting additional cache coherency controls

Tested and verified on all versions of the hardware.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas
2017-06-28 13:43:26 -05:00
committed by David S. Miller
parent 7e1e6b86a5
commit 6f595959c0
5 changed files with 58 additions and 6 deletions
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9
drivers/net/ethernet/amd/xgbe/xgbe-pci.c
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@@ -327,8 +327,9 @@ static int xgbe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
/* Set the DMA coherency values */
pdata->coherent = 1;
pdata->arcr = XGBE_DMA_OS_ARCR;
pdata->awcr = XGBE_DMA_OS_AWCR;
pdata->arcr = XGBE_DMA_PCI_ARCR;
pdata->awcr = XGBE_DMA_PCI_AWCR;
pdata->awarcr = XGBE_DMA_PCI_AWARCR;
/* Set the maximum channels and queues */
reg = XP_IOREAD(pdata, XP_PROP_1);
@@ -447,6 +448,8 @@ static const struct xgbe_version_data xgbe_v2a = {
.ecc_support = 1,
.i2c_support = 1,
.irq_reissue_support = 1,
.tx_desc_prefetch = 5,
.rx_desc_prefetch = 5,
};
static const struct xgbe_version_data xgbe_v2b = {
@@ -459,6 +462,8 @@ static const struct xgbe_version_data xgbe_v2b = {
.ecc_support = 1,
.i2c_support = 1,
.irq_reissue_support = 1,
.tx_desc_prefetch = 5,
.rx_desc_prefetch = 5,
};
static const struct pci_device_id xgbe_pci_table[] = {