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Message-Id: <201511151133.24471.linux@rainbow-software.org>
Date: Sun, 15 Nov 2015 11:33:23 +0100
From: Ondrej Zary <linux@...nbow-software.org>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: netdev <netdev@...r.kernel.org>,
Francois Romieu <romieu@...zoreil.com>,
David Miller <davem@...emloft.net>,
Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dl2k: Add support for IP1000A-based cards
On Sunday 15 November 2015 03:30:25 Andy Shevchenko wrote:
> On Sun, Nov 15, 2015 at 12:05 AM, Ondrej Zary
>
> <linux@...nbow-software.org> 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 <linux@...nbow-software.org>
>
> 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
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel"
> > in the body of a message to majordomo@...r.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
--
Ondrej Zary
--
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