Re: [PATCH net-next v2 9/9] Altera TSE: Add main and header file for Altera Ethernet Driver

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On Mon, Mar 10, 2014 at 11:14:37PM +0000, Vince Bridgers wrote:
> This patch adds the main driver and header file for the Altera Triple
> Speed Ethernet driver.
> 
> Signed-off-by: Vince Bridgers <vbridgers2013@xxxxxxxxx>
> ---
> V2: - Address all comments from initial RFC (thanks Florian!)
>     - Moved asm/cacheflush.h to bottom of header includes
>     - Remove barriers since DMA APIs ensure memory consistency
>     - Add max-frame-size property
>     - Use accessor function of_get_phy_mode instead of custom function
>     - Remove custom function to access devicetree, use of APIs
>     - Deprecate use of Altera devicetree properties where standard
>       ones exist
>     - Remove use of netif_carrier_off - not necessary where it was used
>     - Move probing of phy to the probe routine instead of open
>     - use ether_addr_copy instead of memcpy
> ---
>  drivers/net/ethernet/altera/altera_tse.h      |  486 ++++++++
>  drivers/net/ethernet/altera/altera_tse_main.c | 1546 +++++++++++++++++++++++++
>  2 files changed, 2032 insertions(+)
>  create mode 100644 drivers/net/ethernet/altera/altera_tse.h
>  create mode 100644 drivers/net/ethernet/altera/altera_tse_main.c

[...]

> +static int altera_tse_mdio_create(struct net_device *dev, unsigned int id)
> +{
> +       struct altera_tse_private *priv = netdev_priv(dev);
> +       int ret;
> +       int i;
> +       struct device_node *mdio_node;
> +       struct mii_bus *mdio;
> +
> +       mdio_node = of_find_compatible_node(priv->device->of_node, NULL,
> +               "altr,tse-mdio");

This doesn't find a subnode, as the binding requires. This finds _any_
compatible node in the tree.

There doesn't seem to be an of_find_compatible_child_node, but you can
use for_each_child_of_node and of_device_is_compatible to achieve the
same effect.

[...]

> +static struct phy_device *connect_local_phy(struct net_device *dev)
> +{
> +       struct altera_tse_private *priv = netdev_priv(dev);
> +       struct phy_device *phydev = NULL;
> +       char phy_id_fmt[MII_BUS_ID_SIZE + 3];
> +       int ret;
> +
> +       if (priv->phy_addr != POLL_PHY) {
> +               snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT,
> +                        priv->mdio->id, priv->phy_addr);
> +
> +               dev_dbg(priv->device, "trying to attach to %s\n", phy_id_fmt);
> +
> +               phydev = phy_connect(dev, phy_id_fmt, &altera_tse_adjust_link,
> +                                    priv->phy_iface);
> +               if (IS_ERR(phydev))
> +                       netdev_err(dev, "Could not attach to PHY\n");
> +
> +       } else {
> +               phydev = phy_find_first(priv->mdio);
> +               if (phydev == NULL) {
> +                       netdev_err(dev, "No PHY found\n");
> +                       return phydev;
> +               }
> +
> +               ret = phy_connect_direct(dev, phydev, &altera_tse_adjust_link,
> +                               priv->phy_iface);
> +               if (ret != 0) {
> +                       netdev_err(dev, "Could not attach to PHY\n");
> +                       phydev = NULL;
> +               }
> +       }
> +       return phydev;
> +}
> +
> +/* Initialize driver's PHY state, and attach to the PHY
> + */
> +static int init_phy(struct net_device *dev)
> +{
> +       struct altera_tse_private *priv = netdev_priv(dev);
> +       struct phy_device *phydev;
> +       struct device_node *phynode;
> +
> +       priv->oldlink = 0;
> +       priv->oldspeed = 0;
> +       priv->oldduplex = -1;
> +
> +       phynode = of_parse_phandle(priv->device->of_node, "phy-handle", 0);
> +
> +       if (!phynode) {
> +               netdev_dbg(dev, "no phy-handle found\n");
> +               if (!priv->mdio) {
> +                       netdev_err(dev,
> +                                  "No phy-handle nor local mdio specified\n");
> +                       return -ENODEV;
> +               }
> +               phydev = connect_local_phy(dev);
> +       } else {
> +               netdev_dbg(dev, "phy-handle found\n");
> +               phydev = of_phy_connect(dev, phynode,
> +                       &altera_tse_adjust_link, 0, priv->phy_iface);
> +       }

Be aware that of_phy_connect can return NULL (e.g. if the phy-handle
phandle pointed to a node that wasn't a phy). You'll want to check it's
not NULL before dereferencing it below.

The same seems to be true of connect_local_phy, so the check can be
shared.

[...]

> +       /* get hash filter settings for this instance */
> +       if (of_property_read_u32(pdev->dev.of_node, "altr,enable-hash",
> +                                &priv->hash_filter)) {
> +               dev_err(&pdev->dev, "cannot obtain altr,enable-hash\n");
> +               priv->hash_filter = 0;
> +       }
> +
> +       /* get supplemental address settings for this instance */
> +       if (of_property_read_u32(pdev->dev.of_node, "altr,enable-sup-addr",
> +                                &priv->added_unicast)) {
> +               dev_err(&pdev->dev, "cannot obtain altr,enable-sup-addr\n");
> +               priv->added_unicast = 0;
> +       }

Please change these to boolean/empty properties and use
of_property_read_bool.

> +
> +       /* Max MTU is 1500, ETH_DATA_LEN */
> +       priv->max_mtu = ETH_DATA_LEN;
> +
> +       /* Get the max mtu from the device tree. Note that the
> +        * "max-frame-size" parameter is actually max mtu. Definition
> +        * in the ePAPR v1.1 spec and usage differ, so go with usage.
> +        */
> +       of_property_read_u32(pdev->dev.of_node, "max-frame-size",
> +                            &priv->max_mtu);
> +
> +       /* The DMA buffer size already accounts for an alignment bias
> +        * to avoid unaligned access exceptions for the NIOS processor,
> +        */
> +       priv->rx_dma_buf_sz = ALTERA_RXDMABUFFER_SIZE;
> +
> +       /* get default MAC address from device tree */
> +       macaddr = of_get_property(pdev->dev.of_node, "local-mac-address", &len);
> +       if (macaddr && len == ETH_ALEN)
> +               ether_addr_copy(ndev->dev_addr, macaddr);

Any reason we couldn't use of_get_mac_address here? It also checks that
the address is valid.

Cheers,
Mark.
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