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SubjectRe: [RFC PATCH 2/3] net/dsa: Allow probing dsa from usbnet
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On Tue, Apr 21, 2015 at 6:56 PM, Jan Kaisrlik <kaisrja1@fel.cvut.cz> wrote:
> From: Jan Kaisrlik <ja.kaisrlik@gmail.com>
>
> This patch adds a function which helps to connect net device
> to DSA switch based on mii_bus and netdev.
>
> The switch parameters of the switch are configured in fill_platform_data().
> Currently, the configuration data is hardcoded in the code.
> I don't know how to pass the configuration data from
> user space.
>
> It is not possible to determine the configuration data in plug-and-play
> manner in mv88e6060 driver.
>
> I have thought about two possibilities how to do that. First one is to
> load data from the device tree, because loading from device tree is
> already implemented in dsa_of_probe().
>
> Second possibility is to send configuration of switch via sysfs.
>
> In my opinion, the second one is better because I have already used
> sysfs to bind USB to DSA in patch 3/3.
>
> ---
> include/net/dsa.h | 3 ++
> net/dsa/dsa.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 124 insertions(+)
>
> diff --git a/include/net/dsa.h b/include/net/dsa.h
> index ed3c34b..df7b748 100644
> --- a/include/net/dsa.h
> +++ b/include/net/dsa.h
> @@ -290,4 +290,7 @@ static inline bool dsa_uses_tagged_protocol(struct dsa_switch_tree *dst)
> {
> return dst->rcv != NULL;
> }
> +
> +int dsa_probe_mii(struct mii_bus *bus, struct net_device * dev);
> +
> #endif
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index e2c0703..cb5d9c2 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -798,6 +798,127 @@ out:
> return ret;
> }
>
> +static int fill_platform_data(struct dsa_platform_data *pd,
> + struct mii_bus *bus, struct device * parent){
> + struct dsa_chip_data * cd;
> + int i;
> +
> + static struct device_node dn = {
> + .name = "name",
> + .type = "type",
> + .phandle = 0,
> + .full_name = "fullname",
> + .fwnode = {1},
> + .properties = NULL,
> + .deadprops = NULL,
> + .parent = NULL,
> + .child = NULL,
> + .sibling = NULL,
> + .kobj = {NULL},
> + ._flags = 0,
> + .data = NULL
> + };
> + static struct device_node dnc = {
> + .name = "name",
> + .type = "type",
> + .phandle = 0,
> + .full_name = "fullname",
> + .fwnode = {1},
> + .properties = NULL,
> + .deadprops = NULL,
> + .parent = &dn,
> + .child = NULL,
> + .sibling = NULL,
> + .kobj = {NULL},
> + ._flags = 0,
> + .data = NULL
> + };
> + static char *port_names[12] = {"0", "1", "2", "3", "4",
> + "5", "6", "7", "8", "9", "10", "11"};
> +
> + pd->nr_chips = 1;
> + pd->netdev = parent;
> +
> + cd = kzalloc(sizeof(*cd), GFP_KERNEL);
> + if (cd == NULL)
> + return -ENOMEM;
> +
> + pd->chip = cd;
> +
> + cd->host_dev = parent;
> + cd->sw_addr = 0x10;
> + cd->eeprom_len = 256;
> + cd->of_node = &dn;
> + cd->rtable = 0;
> +
> +// cd->of_node = kzalloc(sizeof(*cd->of_node), GFP_KERNEL);
> +// if(cd->of_node == NULL)
> +// goto free;
> +
> + for (i = 0; i < DSA_MAX_PORTS; i++) {
> + cd->port_names[i] = port_names[i];
> + cd->port_dn[i] = &dnc;
> + }
> +
> + return 0;
> +
> +//free:
> +// kfree(cd);
> +// return -ENOMEM;
> +}

Use proper commenting style.
why are you keeping these commented code ?

> +
> +int dsa_probe_mii(struct mii_bus *bus, struct net_device * dev)
> +{
> + struct dsa_platform_data *pd;
> + struct dsa_switch_tree *dst;
> + int ret;
> +
> + pr_notice_once("Distributed Switch Architecture driver version %s\n",
> + dsa_driver_version);
> +
> + if (dev == NULL || bus == NULL)
> + return -EINVAL;
> +
> + pd = kzalloc(sizeof(*pd), GFP_KERNEL);
> + if (pd == NULL) {
> + ret = -ENOMEM;
> + goto freep;
> + }
> +
> + ret = fill_platform_data(pd, bus, bus->parent); //TODO fix it!
> + if (ret)
> + goto freep;
> +
> + if (dev->dsa_ptr != NULL) {
> + dev_put(dev);
> + ret = -EEXIST;
> + goto freep;
> + }
> +
> + dst = kzalloc(sizeof(*dst), GFP_KERNEL);

Use devm_* variant

~Rajeev
> + if (dst == NULL) {
> + dev_put(dev);
> + ret = -ENOMEM;
> + goto freed;
> + }
> +
> + dev_set_drvdata(bus->parent, dst);
> +
> + dst->pd = pd;
> + dst->master_netdev = dev;
> +
> + dsa_probe_common(dst, bus->parent);
> +
> + return 0;
> +
> +freed:
> + kfree(dst);
> +freep:
> + kfree(pd);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(dsa_probe_mii);
> +
> static int dsa_remove(struct platform_device *pdev)
> {
> struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
> --
> 2.1.3
>
> --
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