Subject: Re: [PATCH 1/2] dl2k: Add support for IP1000A-based cards

From: Ondrej Zary <[email-masked]>
Date: Sun, 15 Nov 2015 11:33:23 +0100

On Sunday 15 November 2015 03:30:25 Andy Shevchenko wrote:
> On Sun, Nov 15, 2015 at 12:05 AM, Ondrej Zary
>
> <[email-masked]> wrote:
> > Add support for IP1000A chips to dl2k driver.
> > IP1000A chip looks like a TC9020 with integrated PHY.
> >
> > This allows IP1000A chips to work reliably because the ipg driver is
> > buggy - it loses packets under load and then completely stops
> > transmitting data.
> >
> > Tested with Asus NX1101 v2.0 at 10, 100 and 1000Mbps.
> > Also verified that it does not break D-Link DGE-550T.
> >
> > Signed-off-by: Ondrej Zary <[email-masked]>
>
> Nitpicks below.
>
> > --- a/drivers/net/ethernet/dlink/dl2k.c
> > +++ b/drivers/net/ethernet/dlink/dl2k.c
> > @@ -253,6 +253,18 @@ rio_probe1 (struct pci_dev *pdev, const struct
> > pci_device_id *ent) if (err)
> >                 goto err_out_unmap_rx;
> >
> > +       if (np->chip_id == CHIP_IP1000A &&
> > +           (np->pdev->revision == 0x40 || np->pdev->revision == 0x41)) {
> > +               /* PHY magic taken from ipg driver */
> > +               mii_write(dev, np->phy_addr, 31, 0x0001);
> > +               mii_write(dev, np->phy_addr, 27, 0x01e0);
> > +               mii_write(dev, np->phy_addr, 31, 0x0002);
> > +               mii_write(dev, np->phy_addr, 27, 0xeb8e);
> > +               mii_write(dev, np->phy_addr, 31, 0x0000);
> > +               mii_write(dev, np->phy_addr, 30, 0x005e);
> > +               mii_write(dev, np->phy_addr, 9, 0x0700);
>
> Isn't too many magic numbers?

It's taken from the ipg driver where it was even more cryptic.
I'll try to decode the magic numbers to something readable.

> > +       }
> > +
> >         /* Fiber device? */
> >         np->phy_media = (dr16(ASICCtrl) & PhyMedia) ? 1 : 0;
> >         np->link_status = 0;
> > @@ -361,6 +373,11 @@ parse_eeprom (struct net_device *dev)
> >         for (i = 0; i < 6; i++)
> >                 dev->dev_addr[i] = psrom->mac_addr[i];
> >
> > +       if (np->chip_id == CHIP_IP1000A) {
> > +               np->led_mode = psrom->led_mode;
> > +               return 0;
> > +       }
> > +
> >         if (np->pdev->vendor != PCI_VENDOR_ID_DLINK) {
> >                 return 0;
> >         }
> > @@ -406,6 +423,28 @@ parse_eeprom (struct net_device *dev)
> >         return 0;
> >  }
> >
> > +static void rio_set_led_mode(struct net_device *dev)
> > +{
> > +       struct netdev_private *np = netdev_priv(dev);
> > +       void __iomem *ioaddr = np->ioaddr;
> > +       u32 mode;
> > +
> > +       if (np->chip_id != CHIP_IP1000A)
> > +               return;
> > +
> > +       mode = dr32(ASICCtrl);
> > +       mode &= ~(IPG_AC_LED_MODE_BIT_1 | IPG_AC_LED_MODE |
> > IPG_AC_LED_SPEED); +
> > +       if ((np->led_mode & 0x03) > 1)
>
> Isn't "& 0x03) > 1" the same as plain "& 0x02"?

Yes, you're right. It's copied from the ipg driver. I'll fix it.

> > +               mode |= IPG_AC_LED_MODE_BIT_1;
> > +       if ((np->led_mode & 0x01) == 1)
>
> Hmm… Seems redundant == 1.
>
> > +               mode |= IPG_AC_LED_MODE;
> > +       if ((np->led_mode & 0x08) == 8)
>
> Similar here.
>
> > +               mode |= IPG_AC_LED_SPEED;
> > +
> > +       dw32(ASICCtrl, mode);
> > +}
> > +
> >  static int
> >  rio_open (struct net_device *dev)
> >  {
> > @@ -424,6 +463,8 @@ rio_open (struct net_device *dev)
> >              GlobalReset | DMAReset | FIFOReset | NetworkReset |
> > HostReset); mdelay(10);
> >
> > +       rio_set_led_mode(dev);
> > +
> >         /* DebugCtrl bit 4, 5, 9 must set */
> >         dw32(DebugCtrl, dr32(DebugCtrl) | 0x0230);
> >
> > @@ -433,9 +474,10 @@ rio_open (struct net_device *dev)
> >
> >         alloc_list (dev);
> >
> > -       /* Get station address */
> > -       for (i = 0; i < 6; i++)
> > -               dw8(StationAddr0 + i, dev->dev_addr[i]);
> > +       /* Set station address */
> > +       for (i = 0; i < 3; i++)
> > +               dw16(StationAddr0 + 2 * i,
> > +                    cpu_to_le16(((u16 *)dev->dev_addr)[i]));
>
> Is it specific requirement for new HW? If not, may be another patch
> with micro optimizations.

Yes, the old method does not work on IP1000A. In fact, even the TC9020 
datasheet says: "Access Rule: Word, Double Word". So it was always wrong but 
worked anyway until now.

> >         set_multicast (dev);
> >         if (np->coalesce) {
> > @@ -780,6 +822,7 @@ tx_error (struct net_device *dev, int tx_status)
> >                                 break;
> >                         mdelay (1);
> >                 }
> > +               rio_set_led_mode(dev);
> >                 rio_free_tx (dev, 1);
> >                 /* Reset TFDListPtr */
> >                 dw32(TFDListPtr0, np->tx_ring_dma +
> > @@ -799,6 +842,7 @@ tx_error (struct net_device *dev, int tx_status)
> >                                 break;
> >                         mdelay (1);
> >                 }
> > +               rio_set_led_mode(dev);
> >                 /* Let TxStartThresh stay default value */
> >         }
> >         /* Maximum Collisions */
> > @@ -965,6 +1009,7 @@ rio_error (struct net_device *dev, int int_status)
> >                         dev->name, int_status);
> >                 dw16(ASICCtrl + 2, GlobalReset | HostReset);
> >                 mdelay (500);
> > +               rio_set_led_mode(dev);
> >         }
> >  }
> >
> > diff --git a/drivers/net/ethernet/dlink/dl2k.h
> > b/drivers/net/ethernet/dlink/dl2k.h index 23c07b0..8f4f612 100644
> > --- a/drivers/net/ethernet/dlink/dl2k.h
> > +++ b/drivers/net/ethernet/dlink/dl2k.h
> > @@ -211,6 +211,10 @@ enum ASICCtrl_HiWord_bits {
> >         ResetBusy = 0x0400,
> >  };
> >
> > +#define IPG_AC_LED_MODE                BIT(14)
> > +#define IPG_AC_LED_SPEED       BIT(27)
> > +#define IPG_AC_LED_MODE_BIT_1  BIT(29)
> > +
> >  /* Transmit Frame Control bits */
> >  enum TFC_bits {
> >         DwordAlign = 0x00000000,
> > @@ -332,7 +336,10 @@ typedef struct t_SROM {
> >         u16 asic_ctrl;          /* 0x02 */
> >         u16 sub_vendor_id;      /* 0x04 */
> >         u16 sub_system_id;      /* 0x06 */
> > -       u16 reserved1[12];      /* 0x08-0x1f */
> > +       u16 pci_base_1;         /* 0x08 (IP1000A only) */
> > +       u16 pci_base_2;         /* 0x0a (IP1000A only) */
> > +       u16 led_mode;           /* 0x0c (IP1000A only) */
> > +       u16 reserved1[9];       /* 0x0e-0x1f */
> >         u8 mac_addr[6];         /* 0x20-0x25 */
> >         u8 reserved2[10];       /* 0x26-0x2f */
> >         u8 sib[204];            /* 0x30-0xfb */
> > @@ -397,6 +404,7 @@ struct netdev_private {
> >         u16 advertising;        /* NWay media advertisement */
> >         u16 negotiate;          /* Negotiated media */
> >         int phy_addr;           /* PHY addresses. */
> > +       u16 led_mode;           /* LED mode read from EEPROM (IP1000A
> > only) */ };
> >
> >  /* The station address location in the EEPROM. */
> > @@ -407,10 +415,15 @@ struct netdev_private {
> >          class_mask              of the class are honored during the
> > comparison. driver_data             Data private to the driver.
> >  */
> > +#define CHIP_IP1000A   1
> >
> >  static const struct pci_device_id rio_pci_tbl[] = {
> >         {0x1186, 0x4000, PCI_ANY_ID, PCI_ANY_ID, },
> >         {0x13f0, 0x1021, PCI_ANY_ID, PCI_ANY_ID, },
> > +       { PCI_VDEVICE(SUNDANCE, 0x1023), CHIP_IP1000A },
> > +       { PCI_VDEVICE(SUNDANCE, 0x2021), CHIP_IP1000A },
> > +       { PCI_VDEVICE(DLINK,    0x9021), CHIP_IP1000A },
> > +       { PCI_VDEVICE(DLINK,    0x4020), CHIP_IP1000A },
> >         { }
> >  };
> >  MODULE_DEVICE_TABLE (pci, rio_pci_tbl);
> > --
> > Ondrej Zary
> >
> > --
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-- 
Ondrej Zary