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Message-ID: <20200727020631.GW28704@pendragon.ideasonboard.com>
Date: Mon, 27 Jul 2020 05:06:31 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Fugang Duan <fugang.duan@....com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, andrew@...n.ch,
cphealy@...il.com, martin.fuzzey@...wbird.group
Subject: Re: [RESENT PATCH net--stat 1/1] net: ethernet: fec: Revert "net:
ethernet: fec: Replace interrupt driven MDIO with polled IO"
On Mon, Jul 27, 2020 at 04:24:02AM +0300, Laurent Pinchart wrote:
> On Mon, Apr 27, 2020 at 10:08:04PM +0800, Fugang Duan wrote:
> > This reverts commit 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef.
> >
> > The commit breaks ethernet function on i.MX6SX, i.MX7D, i.MX8MM,
> > i.MX8MQ, and i.MX8QXP platforms. Boot yocto system by NFS mounting
> > rootfs will be failed with the commit.
>
> I'm afraid this commit breaks networking on i.MX7D for me :-( My board
> is configured to boot over NFS root with IP autoconfiguration through
> DHCP. The DHCP request goes out, the reply it sent back by the server,
> but never noticed by the fec driver.
>
> v5.7 works fine. As 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef was merged
> during the v5.8 merge window, I suspect something else cropped in
> between 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef and this patch that
> needs to be reverted too. We're close to v5.8 and it would be annoying
> to see this regression ending up in the released kernel. I can test
> patches, but I'm not familiar enough with the driver (or the networking
> subsystem) to fix the issue myself.
If it can be of any help, I've confirmed that, to get the network back
to usable state from v5.8-rc6, I have to revert all patches up to this
one. This is the top of my branch, on top of v5.8-rc6:
5bbe80c9efea Revert "net: ethernet: fec: Revert "net: ethernet: fec: Replace interrupt driven MDIO with polled IO""
5462896a08c1 Revert "net: ethernet: fec: Replace interrupt driven MDIO with polled IO"
824a82e2bdfa Revert "net: ethernet: fec: move GPR register offset and bit into DT"
bfe330591cab Revert "net: fec: disable correct clk in the err path of fec_enet_clk_enable"
109958cad578 Revert "net: ethernet: fec: prevent tx starvation under high rx load"
> > Signed-off-by: Fugang Duan <fugang.duan@....com>
> >
> > diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
> > index a6cdd5b..e74dd1f 100644
> > --- a/drivers/net/ethernet/freescale/fec.h
> > +++ b/drivers/net/ethernet/freescale/fec.h
> > @@ -376,7 +376,8 @@ 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)
> > +#define FEC_DEFAULT_IMASK (FEC_ENET_TXF | FEC_ENET_RXF | FEC_ENET_MII)
> > +#define FEC_NAPI_IMASK FEC_ENET_MII
> > #define FEC_RX_DISABLED_IMASK (FEC_DEFAULT_IMASK & (~FEC_ENET_RXF))
> >
> > /* ENET interrupt coalescing macro define */
> > @@ -542,6 +543,7 @@ 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 1ae075a..c7b84bb 100644
> > --- 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, except MDIO. */
> > - writel((0xffffffff & ~FEC_ENET_MII), fep->hwp + FEC_IEVENT);
> > + /* Clear any outstanding interrupt. */
> > + writel(0xffffffff, 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(0, fep->hwp + FEC_IMASK);
> > + writel(FEC_ENET_MII, fep->hwp + FEC_IMASK);
> >
> > /* Init the interrupt coalescing */
> > fec_enet_itr_coal_init(ndev);
> > @@ -1652,10 +1652,6 @@ 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);
> >
> > @@ -1663,12 +1659,16 @@ fec_enet_interrupt(int irq, void *dev_id)
> > ret = IRQ_HANDLED;
> >
> > if (napi_schedule_prep(&fep->napi)) {
> > - /* Disable interrupts */
> > - writel(0, fep->hwp + FEC_IMASK);
> > + /* Disable the NAPI interrupts */
> > + writel(FEC_NAPI_IMASK, fep->hwp + FEC_IMASK);
> > __napi_schedule(&fep->napi);
> > }
> > }
> >
> > + if (int_events & FEC_ENET_MII) {
> > + ret = IRQ_HANDLED;
> > + complete(&fep->mdio_done);
> > + }
> > return ret;
> > }
> >
> > @@ -1818,24 +1818,11 @@ 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);
> >
> > @@ -1843,6 +1830,8 @@ 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;
> >
> > @@ -1854,9 +1843,11 @@ 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 */
> > - ret = fec_enet_mdio_wait(fep);
> > - if (ret) {
> > + time_left = wait_for_completion_timeout(&fep->mdio_done,
> > + usecs_to_jiffies(FEC_MII_TIMEOUT));
> > + if (time_left == 0) {
> > netdev_err(fep->netdev, "MDIO address write timeout\n");
> > + ret = -ETIMEDOUT;
> > goto out;
> > }
> >
> > @@ -1875,9 +1866,11 @@ 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 */
> > - ret = fec_enet_mdio_wait(fep);
> > - if (ret) {
> > + time_left = wait_for_completion_timeout(&fep->mdio_done,
> > + usecs_to_jiffies(FEC_MII_TIMEOUT));
> > + if (time_left == 0) {
> > netdev_err(fep->netdev, "MDIO read timeout\n");
> > + ret = -ETIMEDOUT;
> > goto out;
> > }
> >
> > @@ -1895,6 +1888,7 @@ 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);
> >
> > @@ -1904,6 +1898,8 @@ 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;
> >
> > @@ -1915,9 +1911,11 @@ 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 */
> > - ret = fec_enet_mdio_wait(fep);
> > - if (ret) {
> > + time_left = wait_for_completion_timeout(&fep->mdio_done,
> > + usecs_to_jiffies(FEC_MII_TIMEOUT));
> > + if (time_left == 0) {
> > netdev_err(fep->netdev, "MDIO address write timeout\n");
> > + ret = -ETIMEDOUT;
> > goto out;
> > }
> > } else {
> > @@ -1933,9 +1931,12 @@ 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 */
> > - ret = fec_enet_mdio_wait(fep);
> > - if (ret)
> > + time_left = wait_for_completion_timeout(&fep->mdio_done,
> > + usecs_to_jiffies(FEC_MII_TIMEOUT));
> > + if (time_left == 0) {
> > netdev_err(fep->netdev, "MDIO write timeout\n");
> > + ret = -ETIMEDOUT;
> > + }
> >
> > out:
> > pm_runtime_mark_last_busy(dev);
> > @@ -2144,9 +2145,6 @@ 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;
> > @@ -3688,6 +3686,7 @@ 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;
--
Regards,
Laurent Pinchart
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