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Subject[RFC PATCH 2/3] net/dsa: Allow probing dsa from usbnet
Date
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;
+}
+
+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);
+ 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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