net: ethernet: fec: Replace interrupt driven MDIO with polled IO

Measurements of the MDIO bus have shown that driving the MDIO bus
using interrupts is slow. Back to back MDIO transactions take about
90us, with 25us spent performing the transaction, and the remainder of
the time the bus is idle.

Replacing the completion interrupt with polled IO results in back to
back transactions of 40us. The polling loop waiting for the hardware
to complete the transaction takes around 28us. Which suggests
interrupt handling has an overhead of 50us, and polled IO nearly
halves this overhead, and doubles the MDIO performance.

Suggested-by: Chris Heally <cphealy@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index e74dd1f..a6cdd5b 100644 (file)
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -376,8 +376,7 @@ struct bufdesc_ex {
 #define FEC_ENET_TS_AVAIL       ((uint)0x00010000)
 #define FEC_ENET_TS_TIMER       ((uint)0x00008000)
 
-#define FEC_DEFAULT_IMASK (FEC_ENET_TXF | FEC_ENET_RXF | FEC_ENET_MII)
-#define FEC_NAPI_IMASK FEC_ENET_MII
+#define FEC_DEFAULT_IMASK (FEC_ENET_TXF | FEC_ENET_RXF)
 #define FEC_RX_DISABLED_IMASK (FEC_DEFAULT_IMASK & (~FEC_ENET_RXF))
 
 /* ENET interrupt coalescing macro define */
@@ -543,7 +542,6 @@ struct fec_enet_private {
        int     link;
        int     full_duplex;
        int     speed;
-       struct  completion mdio_done;
        int     irq[FEC_IRQ_NUM];
        bool    bufdesc_ex;
        int     pause_flag;

diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index dc6f876..2267bf7 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -976,8 +976,8 @@ fec_restart(struct net_device *ndev)
        writel((__force u32)cpu_to_be32(temp_mac[1]),
               fep->hwp + FEC_ADDR_HIGH);
 
-       /* Clear any outstanding interrupt. */
-       writel(0xffffffff, fep->hwp + FEC_IEVENT);
+       /* Clear any outstanding interrupt, except MDIO. */
+       writel((0xffffffff & ~FEC_ENET_MII), fep->hwp + FEC_IEVENT);
 
        fec_enet_bd_init(ndev);
 
@@ -1123,7 +1123,7 @@ fec_restart(struct net_device *ndev)
        if (fep->link)
                writel(FEC_DEFAULT_IMASK, fep->hwp + FEC_IMASK);
        else
-               writel(FEC_ENET_MII, fep->hwp + FEC_IMASK);
+               writel(0, fep->hwp + FEC_IMASK);
 
        /* Init the interrupt coalescing */
        fec_enet_itr_coal_init(ndev);
@@ -1652,6 +1652,10 @@ fec_enet_interrupt(int irq, void *dev_id)
        irqreturn_t ret = IRQ_NONE;
 
        int_events = readl(fep->hwp + FEC_IEVENT);
+
+       /* Don't clear MDIO events, we poll for those */
+       int_events &= ~FEC_ENET_MII;
+
        writel(int_events, fep->hwp + FEC_IEVENT);
        fec_enet_collect_events(fep, int_events);
 
@@ -1659,16 +1663,12 @@ fec_enet_interrupt(int irq, void *dev_id)
                ret = IRQ_HANDLED;
 
                if (napi_schedule_prep(&fep->napi)) {
-                       /* Disable the NAPI interrupts */
-                       writel(FEC_NAPI_IMASK, fep->hwp + FEC_IMASK);
+                       /* Disable interrupts */
+                       writel(0, fep->hwp + FEC_IMASK);
                        __napi_schedule(&fep->napi);
                }
        }
 
-       if (int_events & FEC_ENET_MII) {
-               ret = IRQ_HANDLED;
-               complete(&fep->mdio_done);
-       }
        return ret;
 }
 
@@ -1818,11 +1818,24 @@ static void fec_enet_adjust_link(struct net_device *ndev)
                phy_print_status(phy_dev);
 }
 
+static int fec_enet_mdio_wait(struct fec_enet_private *fep)
+{
+       uint ievent;
+       int ret;
+
+       ret = readl_poll_timeout_atomic(fep->hwp + FEC_IEVENT, ievent,
+                                       ievent & FEC_ENET_MII, 2, 30000);
+
+       if (!ret)
+               writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
+
+       return ret;
+}
+
 static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 {
        struct fec_enet_private *fep = bus->priv;
        struct device *dev = &fep->pdev->dev;
-       unsigned long time_left;
        int ret = 0, frame_start, frame_addr, frame_op;
        bool is_c45 = !!(regnum & MII_ADDR_C45);
 
@@ -1830,8 +1843,6 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
        if (ret < 0)
                return ret;
 
-       reinit_completion(&fep->mdio_done);
-
        if (is_c45) {
                frame_start = FEC_MMFR_ST_C45;
 
@@ -1843,11 +1854,9 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
                       fep->hwp + FEC_MII_DATA);
 
                /* wait for end of transfer */
-               time_left = wait_for_completion_timeout(&fep->mdio_done,
-                               usecs_to_jiffies(FEC_MII_TIMEOUT));
-               if (time_left == 0) {
+               ret = fec_enet_mdio_wait(fep);
+               if (ret) {
                        netdev_err(fep->netdev, "MDIO address write timeout\n");
-                       ret = -ETIMEDOUT;
                        goto out;
                }
 
@@ -1866,11 +1875,9 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
                FEC_MMFR_TA, fep->hwp + FEC_MII_DATA);
 
        /* wait for end of transfer */
-       time_left = wait_for_completion_timeout(&fep->mdio_done,
-                       usecs_to_jiffies(FEC_MII_TIMEOUT));
-       if (time_left == 0) {
+       ret = fec_enet_mdio_wait(fep);
+       if (ret) {
                netdev_err(fep->netdev, "MDIO read timeout\n");
-               ret = -ETIMEDOUT;
                goto out;
        }
 
@@ -1888,7 +1895,6 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
 {
        struct fec_enet_private *fep = bus->priv;
        struct device *dev = &fep->pdev->dev;
-       unsigned long time_left;
        int ret, frame_start, frame_addr;
        bool is_c45 = !!(regnum & MII_ADDR_C45);
 
@@ -1898,8 +1904,6 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
        else
                ret = 0;
 
-       reinit_completion(&fep->mdio_done);
-
        if (is_c45) {
                frame_start = FEC_MMFR_ST_C45;
 
@@ -1911,11 +1915,9 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
                       fep->hwp + FEC_MII_DATA);
 
                /* wait for end of transfer */
-               time_left = wait_for_completion_timeout(&fep->mdio_done,
-                       usecs_to_jiffies(FEC_MII_TIMEOUT));
-               if (time_left == 0) {
+               ret = fec_enet_mdio_wait(fep);
+               if (ret) {
                        netdev_err(fep->netdev, "MDIO address write timeout\n");
-                       ret = -ETIMEDOUT;
                        goto out;
                }
        } else {
@@ -1931,12 +1933,9 @@ static int fec_enet_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
                fep->hwp + FEC_MII_DATA);
 
        /* wait for end of transfer */
-       time_left = wait_for_completion_timeout(&fep->mdio_done,
-                       usecs_to_jiffies(FEC_MII_TIMEOUT));
-       if (time_left == 0) {
+       ret = fec_enet_mdio_wait(fep);
+       if (ret)
                netdev_err(fep->netdev, "MDIO write timeout\n");
-               ret  = -ETIMEDOUT;
-       }
 
 out:
        pm_runtime_mark_last_busy(dev);
@@ -2132,6 +2131,9 @@ static int fec_enet_mii_init(struct platform_device *pdev)
 
        writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
 
+       /* Clear any pending transaction complete indication */
+       writel(FEC_ENET_MII, fep->hwp + FEC_IEVENT);
+
        fep->mii_bus = mdiobus_alloc();
        if (fep->mii_bus == NULL) {
                err = -ENOMEM;
@@ -3674,7 +3676,6 @@ fec_probe(struct platform_device *pdev)
                fep->irq[i] = irq;
        }
 
-       init_completion(&fep->mdio_done);
        ret = fec_enet_mii_init(pdev);
        if (ret)
                goto failed_mii_init;