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Date: Wed, 28 Jun 2017 13:43:26 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: netdev@...r.kernel.org
Cc: David Miller <davem@...emloft.net>
Subject: [PATCH net-next v1 14/14] amd-xgbe: Adjust register settings to
improve performance
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@....com>
---
drivers/net/ethernet/amd/xgbe/xgbe-common.h | 13 +++++++++++++
drivers/net/ethernet/amd/xgbe/xgbe-dev.c | 26 +++++++++++++++++++++++---
drivers/net/ethernet/amd/xgbe/xgbe-main.c | 5 ++++-
drivers/net/ethernet/amd/xgbe/xgbe-pci.c | 9 +++++++--
drivers/net/ethernet/amd/xgbe/xgbe.h | 11 +++++++++++
5 files changed, 58 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-common.h b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
index 6b5c72d..9795419 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-common.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-common.h
@@ -123,8 +123,11 @@
#define DMA_ISR 0x3008
#define DMA_AXIARCR 0x3010
#define DMA_AXIAWCR 0x3018
+#define DMA_AXIAWARCR 0x301c
#define DMA_DSR0 0x3020
#define DMA_DSR1 0x3024
+#define DMA_TXEDMACR 0x3040
+#define DMA_RXEDMACR 0x3044
/* DMA register entry bit positions and sizes */
#define DMA_ISR_MACIS_INDEX 17
@@ -135,12 +138,22 @@
#define DMA_MR_INTM_WIDTH 2
#define DMA_MR_SWR_INDEX 0
#define DMA_MR_SWR_WIDTH 1
+#define DMA_RXEDMACR_RDPS_INDEX 0
+#define DMA_RXEDMACR_RDPS_WIDTH 3
+#define DMA_SBMR_AAL_INDEX 12
+#define DMA_SBMR_AAL_WIDTH 1
#define DMA_SBMR_EAME_INDEX 11
#define DMA_SBMR_EAME_WIDTH 1
#define DMA_SBMR_BLEN_INDEX 1
#define DMA_SBMR_BLEN_WIDTH 7
+#define DMA_SBMR_RD_OSR_LMT_INDEX 16
+#define DMA_SBMR_RD_OSR_LMT_WIDTH 6
#define DMA_SBMR_UNDEF_INDEX 0
#define DMA_SBMR_UNDEF_WIDTH 1
+#define DMA_SBMR_WR_OSR_LMT_INDEX 24
+#define DMA_SBMR_WR_OSR_LMT_WIDTH 6
+#define DMA_TXEDMACR_TDPS_INDEX 0
+#define DMA_TXEDMACR_TDPS_WIDTH 3
/* DMA register values */
#define DMA_SBMR_BLEN_256 256
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index a51ece5..06f953e 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -2114,18 +2114,38 @@ static int xgbe_flush_tx_queues(struct xgbe_prv_data *pdata)
static void xgbe_config_dma_bus(struct xgbe_prv_data *pdata)
{
+ unsigned int sbmr;
+
+ sbmr = XGMAC_IOREAD(pdata, DMA_SBMR);
+
/* Set enhanced addressing mode */
- XGMAC_IOWRITE_BITS(pdata, DMA_SBMR, EAME, 1);
+ XGMAC_SET_BITS(sbmr, DMA_SBMR, EAME, 1);
/* Set the System Bus mode */
- XGMAC_IOWRITE_BITS(pdata, DMA_SBMR, UNDEF, 1);
- XGMAC_IOWRITE_BITS(pdata, DMA_SBMR, BLEN, pdata->blen >> 2);
+ XGMAC_SET_BITS(sbmr, DMA_SBMR, UNDEF, 1);
+ XGMAC_SET_BITS(sbmr, DMA_SBMR, BLEN, pdata->blen >> 2);
+ XGMAC_SET_BITS(sbmr, DMA_SBMR, AAL, pdata->aal);
+ XGMAC_SET_BITS(sbmr, DMA_SBMR, RD_OSR_LMT, pdata->rd_osr_limit - 1);
+ XGMAC_SET_BITS(sbmr, DMA_SBMR, WR_OSR_LMT, pdata->wr_osr_limit - 1);
+
+ XGMAC_IOWRITE(pdata, DMA_SBMR, sbmr);
+
+ /* Set descriptor fetching threshold */
+ if (pdata->vdata->tx_desc_prefetch)
+ XGMAC_IOWRITE_BITS(pdata, DMA_TXEDMACR, TDPS,
+ pdata->vdata->tx_desc_prefetch);
+
+ if (pdata->vdata->rx_desc_prefetch)
+ XGMAC_IOWRITE_BITS(pdata, DMA_RXEDMACR, RDPS,
+ pdata->vdata->rx_desc_prefetch);
}
static void xgbe_config_dma_cache(struct xgbe_prv_data *pdata)
{
XGMAC_IOWRITE(pdata, DMA_AXIARCR, pdata->arcr);
XGMAC_IOWRITE(pdata, DMA_AXIAWCR, pdata->awcr);
+ if (pdata->awarcr)
+ XGMAC_IOWRITE(pdata, DMA_AXIAWARCR, pdata->awarcr);
}
static void xgbe_config_mtl_mode(struct xgbe_prv_data *pdata)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-main.c b/drivers/net/ethernet/amd/xgbe/xgbe-main.c
index 8eec9f5..500147d 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-main.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-main.c
@@ -140,8 +140,11 @@ static void xgbe_default_config(struct xgbe_prv_data *pdata)
{
DBGPR("-->xgbe_default_config\n");
- pdata->blen = DMA_SBMR_BLEN_256;
+ pdata->blen = DMA_SBMR_BLEN_64;
pdata->pbl = DMA_PBL_128;
+ pdata->aal = 1;
+ pdata->rd_osr_limit = 8;
+ pdata->wr_osr_limit = 8;
pdata->tx_sf_mode = MTL_TSF_ENABLE;
pdata->tx_threshold = MTL_TX_THRESHOLD_64;
pdata->tx_osp_mode = DMA_OSP_ENABLE;
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-pci.c b/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
index 1e73768..1e56ad7 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-pci.c
@@ -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 int xgbe_pci_resume(struct pci_dev *pdev)
.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 int xgbe_pci_resume(struct pci_dev *pdev)
.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[] = {
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h b/drivers/net/ethernet/amd/xgbe/xgbe.h
index 4bf82eb..0938294 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
@@ -171,6 +171,11 @@
#define XGBE_DMA_SYS_ARCR 0x00303030
#define XGBE_DMA_SYS_AWCR 0x30303030
+/* DMA cache settings - PCI device */
+#define XGBE_DMA_PCI_ARCR 0x00000003
+#define XGBE_DMA_PCI_AWCR 0x13131313
+#define XGBE_DMA_PCI_AWARCR 0x00000313
+
/* DMA channel interrupt modes */
#define XGBE_IRQ_MODE_EDGE 0
#define XGBE_IRQ_MODE_LEVEL 1
@@ -921,6 +926,8 @@ struct xgbe_version_data {
unsigned int ecc_support;
unsigned int i2c_support;
unsigned int irq_reissue_support;
+ unsigned int tx_desc_prefetch;
+ unsigned int rx_desc_prefetch;
};
struct xgbe_prv_data {
@@ -1000,6 +1007,7 @@ struct xgbe_prv_data {
unsigned int coherent;
unsigned int arcr;
unsigned int awcr;
+ unsigned int awarcr;
/* Service routine support */
struct workqueue_struct *dev_workqueue;
@@ -1024,6 +1032,9 @@ struct xgbe_prv_data {
/* Tx/Rx common settings */
unsigned int blen;
unsigned int pbl;
+ unsigned int aal;
+ unsigned int rd_osr_limit;
+ unsigned int wr_osr_limit;
/* Tx settings */
unsigned int tx_sf_mode;
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