[PATCH net-next v3 7/7] net: axienet: add coalesce timer ethtool configuration
Robert Hancock
robert.hancock at calian.com
Fri Mar 4 18:24:43 PST 2022
Add the ability to configure the RX/TX coalesce timer with ethtool.
Change default setting to scale with the clock rate rather than being a
fixed number of clock cycles.
Signed-off-by: Robert Hancock <robert.hancock at calian.com>
---
drivers/net/ethernet/xilinx/xilinx_axienet.h | 10 ++--
.../net/ethernet/xilinx/xilinx_axienet_main.c | 51 +++++++++++++++----
2 files changed, 47 insertions(+), 14 deletions(-)
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h
index 6f0f13b4fb1a..0f9c88dd1a4a 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
@@ -119,11 +119,11 @@
#define XAXIDMA_IRQ_ERROR_MASK 0x00004000 /* Error interrupt */
#define XAXIDMA_IRQ_ALL_MASK 0x00007000 /* All interrupts */
-/* Default TX/RX Threshold and waitbound values for SGDMA mode */
+/* Default TX/RX Threshold and delay timer values for SGDMA mode */
#define XAXIDMA_DFT_TX_THRESHOLD 24
-#define XAXIDMA_DFT_TX_WAITBOUND 254
+#define XAXIDMA_DFT_TX_USEC 50
#define XAXIDMA_DFT_RX_THRESHOLD 1
-#define XAXIDMA_DFT_RX_WAITBOUND 254
+#define XAXIDMA_DFT_RX_USEC 50
#define XAXIDMA_BD_CTRL_TXSOF_MASK 0x08000000 /* First tx packet */
#define XAXIDMA_BD_CTRL_TXEOF_MASK 0x04000000 /* Last tx packet */
@@ -425,7 +425,9 @@ struct axidma_bd {
* @csum_offload_on_tx_path: Stores the checksum selection on TX side.
* @csum_offload_on_rx_path: Stores the checksum selection on RX side.
* @coalesce_count_rx: Store the irq coalesce on RX side.
+ * @coalesce_usec_rx: IRQ coalesce delay for RX
* @coalesce_count_tx: Store the irq coalesce on TX side.
+ * @coalesce_usec_tx: IRQ coalesce delay for TX
*/
struct axienet_local {
struct net_device *ndev;
@@ -482,7 +484,9 @@ struct axienet_local {
int csum_offload_on_rx_path;
u32 coalesce_count_rx;
+ u32 coalesce_usec_rx;
u32 coalesce_count_tx;
+ u32 coalesce_usec_tx;
};
/**
diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 860ff0447f71..a51a8228e1b7 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -33,7 +33,7 @@
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/skbuff.h>
-#include <linux/spinlock.h>
+#include <linux/math64.h>
#include <linux/phy.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
@@ -226,6 +226,28 @@ static void axienet_dma_bd_release(struct net_device *ndev)
lp->rx_bd_p);
}
+/**
+ * axienet_usec_to_timer - Calculate IRQ delay timer value
+ * @lp: Pointer to the axienet_local structure
+ * @coalesce_usec: Microseconds to convert into timer value
+ */
+static u32 axienet_usec_to_timer(struct axienet_local *lp, u32 coalesce_usec)
+{
+ u32 result;
+ u64 clk_rate = 125000000; /* arbitrary guess if no clock rate set */
+
+ if (lp->axi_clk)
+ clk_rate = clk_get_rate(lp->axi_clk);
+
+ /* 1 Timeout Interval = 125 * (clock period of SG clock) */
+ result = DIV64_U64_ROUND_CLOSEST((u64)coalesce_usec * clk_rate,
+ (u64)125000000);
+ if (result > 255)
+ result = 255;
+
+ return result;
+}
+
/**
* axienet_dma_start - Set up DMA registers and start DMA operation
* @lp: Pointer to the axienet_local structure
@@ -241,7 +263,8 @@ static void axienet_dma_start(struct axienet_local *lp)
* the first RX packet. Otherwise leave at 0 to disable delay interrupt.
*/
if (lp->coalesce_count_rx > 1)
- lp->rx_dma_cr |= (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT) |
+ lp->rx_dma_cr |= (axienet_usec_to_timer(lp, lp->coalesce_usec_rx)
+ << XAXIDMA_DELAY_SHIFT) |
XAXIDMA_IRQ_DELAY_MASK;
axienet_dma_out32(lp, XAXIDMA_RX_CR_OFFSET, lp->rx_dma_cr);
@@ -252,7 +275,8 @@ static void axienet_dma_start(struct axienet_local *lp)
* the first TX packet. Otherwise leave at 0 to disable delay interrupt.
*/
if (lp->coalesce_count_tx > 1)
- tx_cr |= (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT) |
+ tx_cr |= (axienet_usec_to_timer(lp, lp->coalesce_usec_tx)
+ << XAXIDMA_DELAY_SHIFT) |
XAXIDMA_IRQ_DELAY_MASK;
axienet_dma_out32(lp, XAXIDMA_TX_CR_OFFSET, tx_cr);
@@ -1488,14 +1512,12 @@ axienet_ethtools_get_coalesce(struct net_device *ndev,
struct kernel_ethtool_coalesce *kernel_coal,
struct netlink_ext_ack *extack)
{
- u32 regval = 0;
struct axienet_local *lp = netdev_priv(ndev);
- regval = axienet_dma_in32(lp, XAXIDMA_RX_CR_OFFSET);
- ecoalesce->rx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
- >> XAXIDMA_COALESCE_SHIFT;
- regval = axienet_dma_in32(lp, XAXIDMA_TX_CR_OFFSET);
- ecoalesce->tx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK)
- >> XAXIDMA_COALESCE_SHIFT;
+
+ ecoalesce->rx_max_coalesced_frames = lp->coalesce_count_rx;
+ ecoalesce->rx_coalesce_usecs = lp->coalesce_usec_rx;
+ ecoalesce->tx_max_coalesced_frames = lp->coalesce_count_tx;
+ ecoalesce->tx_coalesce_usecs = lp->coalesce_usec_tx;
return 0;
}
@@ -1528,8 +1550,12 @@ axienet_ethtools_set_coalesce(struct net_device *ndev,
if (ecoalesce->rx_max_coalesced_frames)
lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
+ if (ecoalesce->rx_coalesce_usecs)
+ lp->coalesce_usec_rx = ecoalesce->rx_coalesce_usecs;
if (ecoalesce->tx_max_coalesced_frames)
lp->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames;
+ if (ecoalesce->tx_coalesce_usecs)
+ lp->coalesce_usec_tx = ecoalesce->tx_coalesce_usecs;
return 0;
}
@@ -1560,7 +1586,8 @@ static int axienet_ethtools_nway_reset(struct net_device *dev)
}
static const struct ethtool_ops axienet_ethtool_ops = {
- .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
+ .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
+ ETHTOOL_COALESCE_USECS,
.get_drvinfo = axienet_ethtools_get_drvinfo,
.get_regs_len = axienet_ethtools_get_regs_len,
.get_regs = axienet_ethtools_get_regs,
@@ -2047,7 +2074,9 @@ static int axienet_probe(struct platform_device *pdev)
}
lp->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD;
+ lp->coalesce_usec_rx = XAXIDMA_DFT_RX_USEC;
lp->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD;
+ lp->coalesce_usec_tx = XAXIDMA_DFT_TX_USEC;
/* Reset core now that clocks are enabled, prior to accessing MDIO */
ret = __axienet_device_reset(lp);
--
2.31.1
More information about the linux-arm-kernel
mailing list