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Date: Tue, 11 Mar 2014 10:38:37 -0500
From: Vince Bridgers <vbridgers2013@...il.com>
To: Mark Rutland <mark.rutland@....com>
Cc: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
Pawel Moll <Pawel.Moll@....com>,
"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
"galak@...eaurora.org" <galak@...eaurora.org>,
"rob@...dley.net" <rob@...dley.net>
Subject: Re: [PATCH net-next v2 9/9] Altera TSE: Add main and header file for
Altera Ethernet Driver
On Tue, Mar 11, 2014 at 4:44 AM, Mark Rutland <mark.rutland@....com> wrote:
> 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@...il.com>
>> ---
>> 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.
Double doh! Will address, thank you.
>
> [...]
>
>> +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.
Doh! Will address, thank you.
>
> [...]
>
>> + /* 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.
Will do, thank you.
>
>> +
>> + /* 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.
No reason, an oversight. I'll address.
>
> Cheers,
> Mark.
Thank you for taking the time to review and comment. I'll address the
comments and respin the patch.
All the best,
Vince
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