Fixed MTP to work with TWRP

net/dsa/Kconfig

@@ -0,0 +1,27 @@
+config HAVE_NET_DSA
+	def_bool y
+	depends on NETDEVICES && !S390
+
+# Drivers must select NET_DSA and the appropriate tagging format
+
+config NET_DSA
+	tristate
+	depends on HAVE_NET_DSA
+	select PHYLIB
+
+if NET_DSA
+
+# tagging formats
+config NET_DSA_TAG_BRCM
+	bool
+
+config NET_DSA_TAG_DSA
+	bool
+
+config NET_DSA_TAG_EDSA
+	bool
+
+config NET_DSA_TAG_TRAILER
+	bool
+
+endif

net/dsa/Makefile

@@ -0,0 +1,9 @@
+# the core
+obj-$(CONFIG_NET_DSA) += dsa_core.o
+dsa_core-y += dsa.o slave.o
+
+# tagging formats
+dsa_core-$(CONFIG_NET_DSA_TAG_BRCM) += tag_brcm.o
+dsa_core-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o
+dsa_core-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o
+dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o

net/dsa/dsa.c

@@ -0,0 +1,780 @@
+/*
+ * net/dsa/dsa.c - Hardware switch handling
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/dsa.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include "dsa_priv.h"
+
+char dsa_driver_version[] = "0.1";
+
+
+/* switch driver registration ***********************************************/
+static DEFINE_MUTEX(dsa_switch_drivers_mutex);
+static LIST_HEAD(dsa_switch_drivers);
+
+void register_switch_driver(struct dsa_switch_driver *drv)
+{
+	mutex_lock(&dsa_switch_drivers_mutex);
+	list_add_tail(&drv->list, &dsa_switch_drivers);
+	mutex_unlock(&dsa_switch_drivers_mutex);
+}
+EXPORT_SYMBOL_GPL(register_switch_driver);
+
+void unregister_switch_driver(struct dsa_switch_driver *drv)
+{
+	mutex_lock(&dsa_switch_drivers_mutex);
+	list_del_init(&drv->list);
+	mutex_unlock(&dsa_switch_drivers_mutex);
+}
+EXPORT_SYMBOL_GPL(unregister_switch_driver);
+
+static struct dsa_switch_driver *
+dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
+{
+	struct dsa_switch_driver *ret;
+	struct list_head *list;
+	char *name;
+
+	ret = NULL;
+	name = NULL;
+
+	mutex_lock(&dsa_switch_drivers_mutex);
+	list_for_each(list, &dsa_switch_drivers) {
+		struct dsa_switch_driver *drv;
+
+		drv = list_entry(list, struct dsa_switch_driver, list);
+
+		name = drv->probe(host_dev, sw_addr);
+		if (name != NULL) {
+			ret = drv;
+			break;
+		}
+	}
+	mutex_unlock(&dsa_switch_drivers_mutex);
+
+	*_name = name;
+
+	return ret;
+}
+
+
+/* basic switch operations **************************************************/
+static struct dsa_switch *
+dsa_switch_setup(struct dsa_switch_tree *dst, int index,
+		 struct device *parent, struct device *host_dev)
+{
+	struct dsa_chip_data *pd = dst->pd->chip + index;
+	struct dsa_switch_driver *drv;
+	struct dsa_switch *ds;
+	int ret;
+	char *name;
+	int i;
+	bool valid_name_found = false;
+
+	/*
+	 * Probe for switch model.
+	 */
+	drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
+	if (drv == NULL) {
+		printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
+		       dst->master_netdev->name, index);
+		return ERR_PTR(-EINVAL);
+	}
+	printk(KERN_INFO "%s[%d]: detected a %s switch\n",
+		dst->master_netdev->name, index, name);
+
+
+	/*
+	 * Allocate and initialise switch state.
+	 */
+	ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
+	if (ds == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	ds->dst = dst;
+	ds->index = index;
+	ds->pd = dst->pd->chip + index;
+	ds->drv = drv;
+	ds->master_dev = host_dev;
+
+	/*
+	 * Validate supplied switch configuration.
+	 */
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		char *name;
+
+		name = pd->port_names[i];
+		if (name == NULL)
+			continue;
+
+		if (!strcmp(name, "cpu")) {
+			if (dst->cpu_switch != -1) {
+				printk(KERN_ERR "multiple cpu ports?!\n");
+				ret = -EINVAL;
+				goto out;
+			}
+			dst->cpu_switch = index;
+			dst->cpu_port = i;
+		} else if (!strcmp(name, "dsa")) {
+			ds->dsa_port_mask |= 1 << i;
+		} else {
+			ds->phys_port_mask |= 1 << i;
+		}
+		valid_name_found = true;
+	}
+
+	if (!valid_name_found && i == DSA_MAX_PORTS) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	/* Make the built-in MII bus mask match the number of ports,
+	 * switch drivers can override this later
+	 */
+	ds->phys_mii_mask = ds->phys_port_mask;
+
+	/*
+	 * If the CPU connects to this switch, set the switch tree
+	 * tagging protocol to the preferred tagging format of this
+	 * switch.
+	 */
+	if (dst->cpu_switch == index) {
+		switch (drv->tag_protocol) {
+#ifdef CONFIG_NET_DSA_TAG_DSA
+		case DSA_TAG_PROTO_DSA:
+			dst->rcv = dsa_netdev_ops.rcv;
+			break;
+#endif
+#ifdef CONFIG_NET_DSA_TAG_EDSA
+		case DSA_TAG_PROTO_EDSA:
+			dst->rcv = edsa_netdev_ops.rcv;
+			break;
+#endif
+#ifdef CONFIG_NET_DSA_TAG_TRAILER
+		case DSA_TAG_PROTO_TRAILER:
+			dst->rcv = trailer_netdev_ops.rcv;
+			break;
+#endif
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+		case DSA_TAG_PROTO_BRCM:
+			dst->rcv = brcm_netdev_ops.rcv;
+			break;
+#endif
+		case DSA_TAG_PROTO_NONE:
+			break;
+		default:
+			ret = -ENOPROTOOPT;
+			goto out;
+		}
+
+		dst->tag_protocol = drv->tag_protocol;
+	}
+
+	/*
+	 * Do basic register setup.
+	 */
+	ret = drv->setup(ds);
+	if (ret < 0)
+		goto out;
+
+	ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
+	if (ret < 0)
+		goto out;
+
+	ds->slave_mii_bus = mdiobus_alloc();
+	if (ds->slave_mii_bus == NULL) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	dsa_slave_mii_bus_init(ds);
+
+	ret = mdiobus_register(ds->slave_mii_bus);
+	if (ret < 0)
+		goto out_free;
+
+
+	/*
+	 * Create network devices for physical switch ports.
+	 */
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		struct net_device *slave_dev;
+
+		if (!(ds->phys_port_mask & (1 << i)))
+			continue;
+
+		slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
+		if (slave_dev == NULL) {
+			printk(KERN_ERR "%s[%d]: can't create dsa "
+			       "slave device for port %d(%s)\n",
+			       dst->master_netdev->name,
+			       index, i, pd->port_names[i]);
+			continue;
+		}
+
+		ds->ports[i] = slave_dev;
+	}
+
+	return ds;
+
+out_free:
+	mdiobus_free(ds->slave_mii_bus);
+out:
+	kfree(ds);
+	return ERR_PTR(ret);
+}
+
+static void dsa_switch_destroy(struct dsa_switch *ds)
+{
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dsa_switch_suspend(struct dsa_switch *ds)
+{
+	int i, ret = 0;
+
+	/* Suspend slave network devices */
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		if (!(ds->phys_port_mask & (1 << i)))
+			continue;
+
+		ret = dsa_slave_suspend(ds->ports[i]);
+		if (ret)
+			return ret;
+	}
+
+	if (ds->drv->suspend)
+		ret = ds->drv->suspend(ds);
+
+	return ret;
+}
+
+static int dsa_switch_resume(struct dsa_switch *ds)
+{
+	int i, ret = 0;
+
+	if (ds->drv->resume)
+		ret = ds->drv->resume(ds);
+
+	if (ret)
+		return ret;
+
+	/* Resume slave network devices */
+	for (i = 0; i < DSA_MAX_PORTS; i++) {
+		if (!(ds->phys_port_mask & (1 << i)))
+			continue;
+
+		ret = dsa_slave_resume(ds->ports[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+#endif
+
+
+/* link polling *************************************************************/
+static void dsa_link_poll_work(struct work_struct *ugly)
+{
+	struct dsa_switch_tree *dst;
+	int i;
+
+	dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
+
+	for (i = 0; i < dst->pd->nr_chips; i++) {
+		struct dsa_switch *ds = dst->ds[i];
+
+		if (ds != NULL && ds->drv->poll_link != NULL)
+			ds->drv->poll_link(ds);
+	}
+
+	mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
+}
+
+static void dsa_link_poll_timer(unsigned long _dst)
+{
+	struct dsa_switch_tree *dst = (void *)_dst;
+
+	schedule_work(&dst->link_poll_work);
+}
+
+
+/* platform driver init and cleanup *****************************************/
+static int dev_is_class(struct device *dev, void *class)
+{
+	if (dev->class != NULL && !strcmp(dev->class->name, class))
+		return 1;
+
+	return 0;
+}
+
+static struct device *dev_find_class(struct device *parent, char *class)
+{
+	if (dev_is_class(parent, class)) {
+		get_device(parent);
+		return parent;
+	}
+
+	return device_find_child(parent, class, dev_is_class);
+}
+
+struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
+{
+	struct device *d;
+
+	d = dev_find_class(dev, "mdio_bus");
+	if (d != NULL) {
+		struct mii_bus *bus;
+
+		bus = to_mii_bus(d);
+		put_device(d);
+
+		return bus;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
+
+static struct net_device *dev_to_net_device(struct device *dev)
+{
+	struct device *d;
+
+	d = dev_find_class(dev, "net");
+	if (d != NULL) {
+		struct net_device *nd;
+
+		nd = to_net_dev(d);
+		dev_hold(nd);
+		put_device(d);
+
+		return nd;
+	}
+
+	return NULL;
+}
+
+#ifdef CONFIG_OF
+static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
+					struct dsa_chip_data *cd,
+					int chip_index,
+					struct device_node *link)
+{
+	int ret;
+	const __be32 *reg;
+	int link_port_addr;
+	int link_sw_addr;
+	struct device_node *parent_sw;
+	int len;
+
+	parent_sw = of_get_parent(link);
+	if (!parent_sw)
+		return -EINVAL;
+
+	reg = of_get_property(parent_sw, "reg", &len);
+	if (!reg || (len != sizeof(*reg) * 2))
+		return -EINVAL;
+
+	link_sw_addr = be32_to_cpup(reg + 1);
+
+	if (link_sw_addr >= pd->nr_chips)
+		return -EINVAL;
+
+	/* First time routing table allocation */
+	if (!cd->rtable) {
+		cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
+		if (!cd->rtable)
+			return -ENOMEM;
+
+		/* default to no valid uplink/downlink */
+		memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
+	}
+
+	reg = of_get_property(link, "reg", NULL);
+	if (!reg) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	link_port_addr = be32_to_cpup(reg);
+
+	cd->rtable[link_sw_addr] = link_port_addr;
+
+	return 0;
+out:
+	kfree(cd->rtable);
+	return ret;
+}
+
+static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
+{
+	int i;
+	int port_index;
+
+	for (i = 0; i < pd->nr_chips; i++) {
+		port_index = 0;
+		while (port_index < DSA_MAX_PORTS) {
+			kfree(pd->chip[i].port_names[port_index]);
+			port_index++;
+		}
+		kfree(pd->chip[i].rtable);
+	}
+	kfree(pd->chip);
+}
+
+static int dsa_of_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child, *mdio, *ethernet, *port, *link;
+	struct mii_bus *mdio_bus;
+	struct platform_device *ethernet_dev;
+	struct dsa_platform_data *pd;
+	struct dsa_chip_data *cd;
+	const char *port_name;
+	int chip_index, port_index;
+	const unsigned int *sw_addr, *port_reg;
+	int ret;
+
+	mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
+	if (!mdio)
+		return -EINVAL;
+
+	mdio_bus = of_mdio_find_bus(mdio);
+	if (!mdio_bus)
+		return -EINVAL;
+
+	ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
+	if (!ethernet)
+		return -EINVAL;
+
+	ethernet_dev = of_find_device_by_node(ethernet);
+	if (!ethernet_dev)
+		return -ENODEV;
+
+	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+
+	pdev->dev.platform_data = pd;
+	pd->netdev = &ethernet_dev->dev;
+	pd->nr_chips = of_get_child_count(np);
+	if (pd->nr_chips > DSA_MAX_SWITCHES)
+		pd->nr_chips = DSA_MAX_SWITCHES;
+
+	pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
+			GFP_KERNEL);
+	if (!pd->chip) {
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
+	chip_index = -1;
+	for_each_available_child_of_node(np, child) {
+		chip_index++;
+		cd = &pd->chip[chip_index];
+
+		cd->of_node = child;
+		cd->host_dev = &mdio_bus->dev;
+
+		sw_addr = of_get_property(child, "reg", NULL);
+		if (!sw_addr)
+			continue;
+
+		cd->sw_addr = be32_to_cpup(sw_addr);
+		if (cd->sw_addr > PHY_MAX_ADDR)
+			continue;
+
+		for_each_available_child_of_node(child, port) {
+			port_reg = of_get_property(port, "reg", NULL);
+			if (!port_reg)
+				continue;
+
+			port_index = be32_to_cpup(port_reg);
+
+			port_name = of_get_property(port, "label", NULL);
+			if (!port_name)
+				continue;
+
+			cd->port_dn[port_index] = port;
+
+			cd->port_names[port_index] = kstrdup(port_name,
+					GFP_KERNEL);
+			if (!cd->port_names[port_index]) {
+				ret = -ENOMEM;
+				goto out_free_chip;
+			}
+
+			link = of_parse_phandle(port, "link", 0);
+
+			if (!strcmp(port_name, "dsa") && link &&
+					pd->nr_chips > 1) {
+				ret = dsa_of_setup_routing_table(pd, cd,
+						chip_index, link);
+				if (ret)
+					goto out_free_chip;
+			}
+
+			if (port_index == DSA_MAX_PORTS)
+				break;
+		}
+	}
+
+	return 0;
+
+out_free_chip:
+	dsa_of_free_platform_data(pd);
+out_free:
+	kfree(pd);
+	pdev->dev.platform_data = NULL;
+	return ret;
+}
+
+static void dsa_of_remove(struct platform_device *pdev)
+{
+	struct dsa_platform_data *pd = pdev->dev.platform_data;
+
+	if (!pdev->dev.of_node)
+		return;
+
+	dsa_of_free_platform_data(pd);
+	kfree(pd);
+}
+#else
+static inline int dsa_of_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static inline void dsa_of_remove(struct platform_device *pdev)
+{
+}
+#endif
+
+static int dsa_probe(struct platform_device *pdev)
+{
+	static int dsa_version_printed;
+	struct dsa_platform_data *pd = pdev->dev.platform_data;
+	struct net_device *dev;
+	struct dsa_switch_tree *dst;
+	int i, ret;
+
+	if (!dsa_version_printed++)
+		printk(KERN_NOTICE "Distributed Switch Architecture "
+			"driver version %s\n", dsa_driver_version);
+
+	if (pdev->dev.of_node) {
+		ret = dsa_of_probe(pdev);
+		if (ret)
+			return ret;
+
+		pd = pdev->dev.platform_data;
+	}
+
+	if (pd == NULL || pd->netdev == NULL)
+		return -EINVAL;
+
+	dev = dev_to_net_device(pd->netdev);
+	if (dev == NULL) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (dev->dsa_ptr != NULL) {
+		dev_put(dev);
+		ret = -EEXIST;
+		goto out;
+	}
+
+	dst = kzalloc(sizeof(*dst), GFP_KERNEL);
+	if (dst == NULL) {
+		dev_put(dev);
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	platform_set_drvdata(pdev, dst);
+
+	dst->pd = pd;
+	dst->master_netdev = dev;
+	dst->cpu_switch = -1;
+	dst->cpu_port = -1;
+
+	for (i = 0; i < pd->nr_chips; i++) {
+		struct dsa_switch *ds;
+
+		ds = dsa_switch_setup(dst, i, &pdev->dev, pd->chip[i].host_dev);
+		if (IS_ERR(ds)) {
+			printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
+				"instance (error %ld)\n", dev->name, i,
+				PTR_ERR(ds));
+			continue;
+		}
+
+		dst->ds[i] = ds;
+		if (ds->drv->poll_link != NULL)
+			dst->link_poll_needed = 1;
+	}
+
+	/*
+	 * If we use a tagging format that doesn't have an ethertype
+	 * field, make sure that all packets from this point on get
+	 * sent to the tag format's receive function.
+	 */
+	wmb();
+	dev->dsa_ptr = (void *)dst;
+
+	if (dst->link_poll_needed) {
+		INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
+		init_timer(&dst->link_poll_timer);
+		dst->link_poll_timer.data = (unsigned long)dst;
+		dst->link_poll_timer.function = dsa_link_poll_timer;
+		dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
+		add_timer(&dst->link_poll_timer);
+	}
+
+	return 0;
+
+out:
+	dsa_of_remove(pdev);
+
+	return ret;
+}
+
+static int dsa_remove(struct platform_device *pdev)
+{
+	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	int i;
+
+	if (dst->link_poll_needed)
+		del_timer_sync(&dst->link_poll_timer);
+
+	flush_work(&dst->link_poll_work);
+
+	for (i = 0; i < dst->pd->nr_chips; i++) {
+		struct dsa_switch *ds = dst->ds[i];
+
+		if (ds != NULL)
+			dsa_switch_destroy(ds);
+	}
+
+	dsa_of_remove(pdev);
+
+	return 0;
+}
+
+static void dsa_shutdown(struct platform_device *pdev)
+{
+}
+
+static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
+			  struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst = dev->dsa_ptr;
+
+	if (unlikely(dst == NULL)) {
+		kfree_skb(skb);
+		return 0;
+	}
+
+	return dst->rcv(skb, dev, pt, orig_dev);
+}
+
+static struct packet_type dsa_pack_type __read_mostly = {
+	.type	= cpu_to_be16(ETH_P_XDSA),
+	.func	= dsa_switch_rcv,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int dsa_suspend(struct device *d)
+{
+	struct platform_device *pdev = to_platform_device(d);
+	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	int i, ret = 0;
+
+	for (i = 0; i < dst->pd->nr_chips; i++) {
+		struct dsa_switch *ds = dst->ds[i];
+
+		if (ds != NULL)
+			ret = dsa_switch_suspend(ds);
+	}
+
+	return ret;
+}
+
+static int dsa_resume(struct device *d)
+{
+	struct platform_device *pdev = to_platform_device(d);
+	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	int i, ret = 0;
+
+	for (i = 0; i < dst->pd->nr_chips; i++) {
+		struct dsa_switch *ds = dst->ds[i];
+
+		if (ds != NULL)
+			ret = dsa_switch_resume(ds);
+	}
+
+	return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
+
+static const struct of_device_id dsa_of_match_table[] = {
+	{ .compatible = "brcm,bcm7445-switch-v4.0" },
+	{ .compatible = "marvell,dsa", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, dsa_of_match_table);
+
+static struct platform_driver dsa_driver = {
+	.probe		= dsa_probe,
+	.remove		= dsa_remove,
+	.shutdown	= dsa_shutdown,
+	.driver = {
+		.name	= "dsa",
+		.owner	= THIS_MODULE,
+		.of_match_table = dsa_of_match_table,
+		.pm	= &dsa_pm_ops,
+	},
+};
+
+static int __init dsa_init_module(void)
+{
+	int rc;
+
+	rc = platform_driver_register(&dsa_driver);
+	if (rc)
+		return rc;
+
+	dev_add_pack(&dsa_pack_type);
+
+	return 0;
+}
+module_init(dsa_init_module);
+
+static void __exit dsa_cleanup_module(void)
+{
+	dev_remove_pack(&dsa_pack_type);
+	platform_driver_unregister(&dsa_driver);
+}
+module_exit(dsa_cleanup_module);
+
+MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
+MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:dsa");

net/dsa/dsa_priv.h

@@ -0,0 +1,75 @@
+/*
+ * net/dsa/dsa_priv.h - Hardware switch handling
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __DSA_PRIV_H
+#define __DSA_PRIV_H
+
+#include <linux/phy.h>
+#include <linux/netdevice.h>
+
+struct dsa_device_ops {
+	netdev_tx_t (*xmit)(struct sk_buff *skb, struct net_device *dev);
+	int (*rcv)(struct sk_buff *skb, struct net_device *dev,
+		   struct packet_type *pt, struct net_device *orig_dev);
+};
+
+struct dsa_slave_priv {
+	/*
+	 * The linux network interface corresponding to this
+	 * switch port.
+	 */
+	struct net_device	*dev;
+	netdev_tx_t		(*xmit)(struct sk_buff *skb,
+					struct net_device *dev);
+
+	/*
+	 * Which switch this port is a part of, and the port index
+	 * for this port.
+	 */
+	struct dsa_switch	*parent;
+	u8			port;
+
+	/*
+	 * The phylib phy_device pointer for the PHY connected
+	 * to this port.
+	 */
+	struct phy_device	*phy;
+	phy_interface_t		phy_interface;
+	int			old_link;
+	int			old_pause;
+	int			old_duplex;
+};
+
+/* dsa.c */
+extern char dsa_driver_version[];
+
+/* slave.c */
+extern const struct dsa_device_ops notag_netdev_ops;
+void dsa_slave_mii_bus_init(struct dsa_switch *ds);
+struct net_device *dsa_slave_create(struct dsa_switch *ds,
+				    struct device *parent,
+				    int port, char *name);
+int dsa_slave_suspend(struct net_device *slave_dev);
+int dsa_slave_resume(struct net_device *slave_dev);
+
+/* tag_dsa.c */
+extern const struct dsa_device_ops dsa_netdev_ops;
+
+/* tag_edsa.c */
+extern const struct dsa_device_ops edsa_netdev_ops;
+
+/* tag_trailer.c */
+extern const struct dsa_device_ops trailer_netdev_ops;
+
+/* tag_brcm.c */
+extern const struct dsa_device_ops brcm_netdev_ops;
+
+
+#endif

net/dsa/slave.c

@@ -0,0 +1,618 @@
+/*
+ * net/dsa/slave.c - Slave device handling
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/list.h>
+#include <linux/etherdevice.h>
+#include <linux/phy.h>
+#include <linux/phy_fixed.h>
+#include <linux/of_net.h>
+#include <linux/of_mdio.h>
+#include "dsa_priv.h"
+
+/* slave mii_bus handling ***************************************************/
+static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
+{
+	struct dsa_switch *ds = bus->priv;
+
+	if (ds->phys_mii_mask & (1 << addr))
+		return ds->drv->phy_read(ds, addr, reg);
+
+	return 0xffff;
+}
+
+static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
+{
+	struct dsa_switch *ds = bus->priv;
+
+	if (ds->phys_mii_mask & (1 << addr))
+		return ds->drv->phy_write(ds, addr, reg, val);
+
+	return 0;
+}
+
+void dsa_slave_mii_bus_init(struct dsa_switch *ds)
+{
+	ds->slave_mii_bus->priv = (void *)ds;
+	ds->slave_mii_bus->name = "dsa slave smi";
+	ds->slave_mii_bus->read = dsa_slave_phy_read;
+	ds->slave_mii_bus->write = dsa_slave_phy_write;
+	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
+			ds->index, ds->pd->sw_addr);
+	ds->slave_mii_bus->parent = ds->master_dev;
+}
+
+
+/* slave device handling ****************************************************/
+static int dsa_slave_init(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	dev->iflink = p->parent->dst->master_netdev->ifindex;
+
+	return 0;
+}
+
+static int dsa_slave_open(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct net_device *master = p->parent->dst->master_netdev;
+	struct dsa_switch *ds = p->parent;
+	int err;
+
+	if (!(master->flags & IFF_UP))
+		return -ENETDOWN;
+
+	if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
+		err = dev_uc_add(master, dev->dev_addr);
+		if (err < 0)
+			goto out;
+	}
+
+	if (dev->flags & IFF_ALLMULTI) {
+		err = dev_set_allmulti(master, 1);
+		if (err < 0)
+			goto del_unicast;
+	}
+	if (dev->flags & IFF_PROMISC) {
+		err = dev_set_promiscuity(master, 1);
+		if (err < 0)
+			goto clear_allmulti;
+	}
+
+	if (ds->drv->port_enable) {
+		err = ds->drv->port_enable(ds, p->port, p->phy);
+		if (err)
+			goto clear_promisc;
+	}
+
+	if (p->phy)
+		phy_start(p->phy);
+
+	return 0;
+
+clear_promisc:
+	if (dev->flags & IFF_PROMISC)
+		dev_set_promiscuity(master, 0);
+clear_allmulti:
+	if (dev->flags & IFF_ALLMULTI)
+		dev_set_allmulti(master, -1);
+del_unicast:
+	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
+		dev_uc_del(master, dev->dev_addr);
+out:
+	return err;
+}
+
+static int dsa_slave_close(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct net_device *master = p->parent->dst->master_netdev;
+	struct dsa_switch *ds = p->parent;
+
+	if (p->phy)
+		phy_stop(p->phy);
+
+	dev_mc_unsync(master, dev);
+	dev_uc_unsync(master, dev);
+	if (dev->flags & IFF_ALLMULTI)
+		dev_set_allmulti(master, -1);
+	if (dev->flags & IFF_PROMISC)
+		dev_set_promiscuity(master, -1);
+
+	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
+		dev_uc_del(master, dev->dev_addr);
+
+	if (ds->drv->port_disable)
+		ds->drv->port_disable(ds, p->port, p->phy);
+
+	return 0;
+}
+
+static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct net_device *master = p->parent->dst->master_netdev;
+
+	if (change & IFF_ALLMULTI)
+		dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
+	if (change & IFF_PROMISC)
+		dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
+}
+
+static void dsa_slave_set_rx_mode(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct net_device *master = p->parent->dst->master_netdev;
+
+	dev_mc_sync(master, dev);
+	dev_uc_sync(master, dev);
+}
+
+static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct net_device *master = p->parent->dst->master_netdev;
+	struct sockaddr *addr = a;
+	int err;
+
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
+	if (!(dev->flags & IFF_UP))
+		goto out;
+
+	if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
+		err = dev_uc_add(master, addr->sa_data);
+		if (err < 0)
+			return err;
+	}
+
+	if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
+		dev_uc_del(master, dev->dev_addr);
+
+out:
+	ether_addr_copy(dev->dev_addr, addr->sa_data);
+
+	return 0;
+}
+
+static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	if (p->phy != NULL)
+		return phy_mii_ioctl(p->phy, ifr, cmd);
+
+	return -EOPNOTSUPP;
+}
+
+static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	return p->xmit(skb, dev);
+}
+
+static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
+					struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	skb->dev = p->parent->dst->master_netdev;
+	dev_queue_xmit(skb);
+
+	return NETDEV_TX_OK;
+}
+
+
+/* ethtool operations *******************************************************/
+static int
+dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	int err;
+
+	err = -EOPNOTSUPP;
+	if (p->phy != NULL) {
+		err = phy_read_status(p->phy);
+		if (err == 0)
+			err = phy_ethtool_gset(p->phy, cmd);
+	}
+
+	return err;
+}
+
+static int
+dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	if (p->phy != NULL)
+		return phy_ethtool_sset(p->phy, cmd);
+
+	return -EOPNOTSUPP;
+}
+
+static void dsa_slave_get_drvinfo(struct net_device *dev,
+				  struct ethtool_drvinfo *drvinfo)
+{
+	strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
+	strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
+	strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
+	strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
+}
+
+static int dsa_slave_nway_reset(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	if (p->phy != NULL)
+		return genphy_restart_aneg(p->phy);
+
+	return -EOPNOTSUPP;
+}
+
+static u32 dsa_slave_get_link(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+
+	if (p->phy != NULL) {
+		genphy_update_link(p->phy);
+		return p->phy->link;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static void dsa_slave_get_strings(struct net_device *dev,
+				  uint32_t stringset, uint8_t *data)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+
+	if (stringset == ETH_SS_STATS) {
+		int len = ETH_GSTRING_LEN;
+
+		strncpy(data, "tx_packets", len);
+		strncpy(data + len, "tx_bytes", len);
+		strncpy(data + 2 * len, "rx_packets", len);
+		strncpy(data + 3 * len, "rx_bytes", len);
+		if (ds->drv->get_strings != NULL)
+			ds->drv->get_strings(ds, p->port, data + 4 * len);
+	}
+}
+
+static void dsa_slave_get_ethtool_stats(struct net_device *dev,
+					struct ethtool_stats *stats,
+					uint64_t *data)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+
+	data[0] = p->dev->stats.tx_packets;
+	data[1] = p->dev->stats.tx_bytes;
+	data[2] = p->dev->stats.rx_packets;
+	data[3] = p->dev->stats.rx_bytes;
+	if (ds->drv->get_ethtool_stats != NULL)
+		ds->drv->get_ethtool_stats(ds, p->port, data + 4);
+}
+
+static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+
+	if (sset == ETH_SS_STATS) {
+		int count;
+
+		count = 4;
+		if (ds->drv->get_sset_count != NULL)
+			count += ds->drv->get_sset_count(ds);
+
+		return count;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+
+	if (ds->drv->get_wol)
+		ds->drv->get_wol(ds, p->port, w);
+}
+
+static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+	int ret = -EOPNOTSUPP;
+
+	if (ds->drv->set_wol)
+		ret = ds->drv->set_wol(ds, p->port, w);
+
+	return ret;
+}
+
+static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+	int ret;
+
+	if (!ds->drv->set_eee)
+		return -EOPNOTSUPP;
+
+	ret = ds->drv->set_eee(ds, p->port, p->phy, e);
+	if (ret)
+		return ret;
+
+	if (p->phy)
+		ret = phy_ethtool_set_eee(p->phy, e);
+
+	return ret;
+}
+
+static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+	int ret;
+
+	if (!ds->drv->get_eee)
+		return -EOPNOTSUPP;
+
+	ret = ds->drv->get_eee(ds, p->port, e);
+	if (ret)
+		return ret;
+
+	if (p->phy)
+		ret = phy_ethtool_get_eee(p->phy, e);
+
+	return ret;
+}
+
+static const struct ethtool_ops dsa_slave_ethtool_ops = {
+	.get_settings		= dsa_slave_get_settings,
+	.set_settings		= dsa_slave_set_settings,
+	.get_drvinfo		= dsa_slave_get_drvinfo,
+	.nway_reset		= dsa_slave_nway_reset,
+	.get_link		= dsa_slave_get_link,
+	.get_strings		= dsa_slave_get_strings,
+	.get_ethtool_stats	= dsa_slave_get_ethtool_stats,
+	.get_sset_count		= dsa_slave_get_sset_count,
+	.set_wol		= dsa_slave_set_wol,
+	.get_wol		= dsa_slave_get_wol,
+	.set_eee		= dsa_slave_set_eee,
+	.get_eee		= dsa_slave_get_eee,
+};
+
+static const struct net_device_ops dsa_slave_netdev_ops = {
+	.ndo_init		= dsa_slave_init,
+	.ndo_open	 	= dsa_slave_open,
+	.ndo_stop		= dsa_slave_close,
+	.ndo_start_xmit		= dsa_slave_xmit,
+	.ndo_change_rx_flags	= dsa_slave_change_rx_flags,
+	.ndo_set_rx_mode	= dsa_slave_set_rx_mode,
+	.ndo_set_mac_address	= dsa_slave_set_mac_address,
+	.ndo_do_ioctl		= dsa_slave_ioctl,
+};
+
+static void dsa_slave_adjust_link(struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+	unsigned int status_changed = 0;
+
+	if (p->old_link != p->phy->link) {
+		status_changed = 1;
+		p->old_link = p->phy->link;
+	}
+
+	if (p->old_duplex != p->phy->duplex) {
+		status_changed = 1;
+		p->old_duplex = p->phy->duplex;
+	}
+
+	if (p->old_pause != p->phy->pause) {
+		status_changed = 1;
+		p->old_pause = p->phy->pause;
+	}
+
+	if (ds->drv->adjust_link && status_changed)
+		ds->drv->adjust_link(ds, p->port, p->phy);
+
+	if (status_changed)
+		phy_print_status(p->phy);
+}
+
+static int dsa_slave_fixed_link_update(struct net_device *dev,
+				       struct fixed_phy_status *status)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+
+	if (ds->drv->fixed_link_update)
+		ds->drv->fixed_link_update(ds, p->port, status);
+
+	return 0;
+}
+
+/* slave device setup *******************************************************/
+static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
+				struct net_device *slave_dev)
+{
+	struct dsa_switch *ds = p->parent;
+	struct dsa_chip_data *cd = ds->pd;
+	struct device_node *phy_dn, *port_dn;
+	bool phy_is_fixed = false;
+	u32 phy_flags = 0;
+	int ret;
+
+	port_dn = cd->port_dn[p->port];
+	p->phy_interface = of_get_phy_mode(port_dn);
+
+	phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
+	if (of_phy_is_fixed_link(port_dn)) {
+		/* In the case of a fixed PHY, the DT node associated
+		 * to the fixed PHY is the Port DT node
+		 */
+		ret = of_phy_register_fixed_link(port_dn);
+		if (ret) {
+			pr_err("failed to register fixed PHY\n");
+			return;
+		}
+		phy_is_fixed = true;
+		phy_dn = port_dn;
+	}
+
+	if (ds->drv->get_phy_flags)
+		phy_flags = ds->drv->get_phy_flags(ds, p->port);
+
+	if (phy_dn)
+		p->phy = of_phy_connect(slave_dev, phy_dn,
+					dsa_slave_adjust_link, phy_flags,
+					p->phy_interface);
+
+	if (p->phy && phy_is_fixed)
+		fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
+
+	/* We could not connect to a designated PHY, so use the switch internal
+	 * MDIO bus instead
+	 */
+	if (!p->phy) {
+		p->phy = ds->slave_mii_bus->phy_map[p->port];
+		phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
+				   p->phy_interface);
+	} else {
+		pr_info("attached PHY at address %d [%s]\n",
+			p->phy->addr, p->phy->drv->name);
+	}
+}
+
+int dsa_slave_suspend(struct net_device *slave_dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(slave_dev);
+
+	netif_device_detach(slave_dev);
+
+	if (p->phy) {
+		phy_stop(p->phy);
+		p->old_pause = -1;
+		p->old_link = -1;
+		p->old_duplex = -1;
+		phy_suspend(p->phy);
+	}
+
+	return 0;
+}
+
+int dsa_slave_resume(struct net_device *slave_dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(slave_dev);
+
+	netif_device_attach(slave_dev);
+
+	if (p->phy) {
+		phy_resume(p->phy);
+		phy_start(p->phy);
+	}
+
+	return 0;
+}
+
+struct net_device *
+dsa_slave_create(struct dsa_switch *ds, struct device *parent,
+		 int port, char *name)
+{
+	struct net_device *master = ds->dst->master_netdev;
+	struct net_device *slave_dev;
+	struct dsa_slave_priv *p;
+	int ret;
+
+	slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
+				 NET_NAME_UNKNOWN, ether_setup);
+	if (slave_dev == NULL)
+		return slave_dev;
+
+	slave_dev->features = master->vlan_features;
+	slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
+	eth_hw_addr_inherit(slave_dev, master);
+	slave_dev->tx_queue_len = 0;
+	slave_dev->netdev_ops = &dsa_slave_netdev_ops;
+
+	SET_NETDEV_DEV(slave_dev, parent);
+	slave_dev->dev.of_node = ds->pd->port_dn[port];
+	slave_dev->vlan_features = master->vlan_features;
+
+	p = netdev_priv(slave_dev);
+	p->dev = slave_dev;
+	p->parent = ds;
+	p->port = port;
+
+	switch (ds->dst->tag_protocol) {
+#ifdef CONFIG_NET_DSA_TAG_DSA
+	case DSA_TAG_PROTO_DSA:
+		p->xmit = dsa_netdev_ops.xmit;
+		break;
+#endif
+#ifdef CONFIG_NET_DSA_TAG_EDSA
+	case DSA_TAG_PROTO_EDSA:
+		p->xmit = edsa_netdev_ops.xmit;
+		break;
+#endif
+#ifdef CONFIG_NET_DSA_TAG_TRAILER
+	case DSA_TAG_PROTO_TRAILER:
+		p->xmit = trailer_netdev_ops.xmit;
+		break;
+#endif
+#ifdef CONFIG_NET_DSA_TAG_BRCM
+	case DSA_TAG_PROTO_BRCM:
+		p->xmit = brcm_netdev_ops.xmit;
+		break;
+#endif
+	default:
+		p->xmit	= dsa_slave_notag_xmit;
+		break;
+	}
+
+	p->old_pause = -1;
+	p->old_link = -1;
+	p->old_duplex = -1;
+
+	dsa_slave_phy_setup(p, slave_dev);
+
+	ret = register_netdev(slave_dev);
+	if (ret) {
+		printk(KERN_ERR "%s: error %d registering interface %s\n",
+				master->name, ret, slave_dev->name);
+		free_netdev(slave_dev);
+		return NULL;
+	}
+
+	netif_carrier_off(slave_dev);
+
+	if (p->phy != NULL) {
+		if (ds->drv->get_phy_flags)
+			p->phy->dev_flags |= ds->drv->get_phy_flags(ds, port);
+
+		phy_attach(slave_dev, dev_name(&p->phy->dev),
+			   PHY_INTERFACE_MODE_GMII);
+
+		p->phy->autoneg = AUTONEG_ENABLE;
+		p->phy->speed = 0;
+		p->phy->duplex = 0;
+		p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
+	}
+
+	return slave_dev;
+}

net/dsa/tag_brcm.c

@@ -0,0 +1,171 @@
+/*
+ * Broadcom tag support
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include "dsa_priv.h"
+
+/* This tag length is 4 bytes, older ones were 6 bytes, we do not
+ * handle them
+ */
+#define BRCM_TAG_LEN	4
+
+/* Tag is constructed and desconstructed using byte by byte access
+ * because the tag is placed after the MAC Source Address, which does
+ * not make it 4-bytes aligned, so this might cause unaligned accesses
+ * on most systems where this is used.
+ */
+
+/* Ingress and egress opcodes */
+#define BRCM_OPCODE_SHIFT	5
+#define BRCM_OPCODE_MASK	0x7
+
+/* Ingress fields */
+/* 1st byte in the tag */
+#define BRCM_IG_TC_SHIFT	2
+#define BRCM_IG_TC_MASK		0x7
+/* 2nd byte in the tag */
+#define BRCM_IG_TE_MASK		0x3
+#define BRCM_IG_TS_SHIFT	7
+/* 3rd byte in the tag */
+#define BRCM_IG_DSTMAP2_MASK	1
+#define BRCM_IG_DSTMAP1_MASK	0xff
+
+/* Egress fields */
+
+/* 2nd byte in the tag */
+#define BRCM_EG_CID_MASK	0xff
+
+/* 3rd byte in the tag */
+#define BRCM_EG_RC_MASK		0xff
+#define  BRCM_EG_RC_RSVD	(3 << 6)
+#define  BRCM_EG_RC_EXCEPTION	(1 << 5)
+#define  BRCM_EG_RC_PROT_SNOOP	(1 << 4)
+#define  BRCM_EG_RC_PROT_TERM	(1 << 3)
+#define  BRCM_EG_RC_SWITCH	(1 << 2)
+#define  BRCM_EG_RC_MAC_LEARN	(1 << 1)
+#define  BRCM_EG_RC_MIRROR	(1 << 0)
+#define BRCM_EG_TC_SHIFT	5
+#define BRCM_EG_TC_MASK		0x7
+#define BRCM_EG_PID_MASK	0x1f
+
+static netdev_tx_t brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	u8 *brcm_tag;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	if (skb_cow_head(skb, BRCM_TAG_LEN) < 0)
+		goto out_free;
+
+	skb_push(skb, BRCM_TAG_LEN);
+
+	memmove(skb->data, skb->data + BRCM_TAG_LEN, 2 * ETH_ALEN);
+
+	/* Build the tag after the MAC Source Address */
+	brcm_tag = skb->data + 2 * ETH_ALEN;
+
+	/* Set the ingress opcode, traffic class, tag enforcment is
+	 * deprecated
+	 */
+	brcm_tag[0] = (1 << BRCM_OPCODE_SHIFT) |
+			((skb->priority << BRCM_IG_TC_SHIFT) & BRCM_IG_TC_MASK);
+	brcm_tag[1] = 0;
+	brcm_tag[2] = 0;
+	if (p->port == 8)
+		brcm_tag[2] = BRCM_IG_DSTMAP2_MASK;
+	brcm_tag[3] = (1 << p->port) & BRCM_IG_DSTMAP1_MASK;
+
+	/* Queue the SKB for transmission on the parent interface, but
+	 * do not modify its EtherType
+	 */
+	skb->dev = p->parent->dst->master_netdev;
+	dev_queue_xmit(skb);
+
+	return NETDEV_TX_OK;
+
+out_free:
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static int brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
+			struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst = dev->dsa_ptr;
+	struct dsa_switch *ds;
+	int source_port;
+	u8 *brcm_tag;
+
+	if (unlikely(dst == NULL))
+		goto out_drop;
+
+	ds = dst->ds[0];
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN)))
+		goto out_drop;
+
+	/* skb->data points to the EtherType, the tag is right before it */
+	brcm_tag = skb->data - 2;
+
+	/* The opcode should never be different than 0b000 */
+	if (unlikely((brcm_tag[0] >> BRCM_OPCODE_SHIFT) & BRCM_OPCODE_MASK))
+		goto out_drop;
+
+	/* We should never see a reserved reason code without knowing how to
+	 * handle it
+	 */
+	WARN_ON(brcm_tag[2] & BRCM_EG_RC_RSVD);
+
+	/* Locate which port this is coming from */
+	source_port = brcm_tag[3] & BRCM_EG_PID_MASK;
+
+	/* Validate port against switch setup, either the port is totally */
+	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+		goto out_drop;
+
+	/* Remove Broadcom tag and update checksum */
+	skb_pull_rcsum(skb, BRCM_TAG_LEN);
+
+	/* Move the Ethernet DA and SA */
+	memmove(skb->data - ETH_HLEN,
+		skb->data - ETH_HLEN - BRCM_TAG_LEN,
+		2 * ETH_ALEN);
+
+	skb_push(skb, ETH_HLEN);
+	skb->pkt_type = PACKET_HOST;
+	skb->dev = ds->ports[source_port];
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	skb->dev->stats.rx_packets++;
+	skb->dev->stats.rx_bytes += skb->len;
+
+	netif_receive_skb(skb);
+
+	return 0;
+
+out_drop:
+	kfree_skb(skb);
+out:
+	return 0;
+}
+
+const struct dsa_device_ops brcm_netdev_ops = {
+	.xmit	= brcm_tag_xmit,
+	.rcv	= brcm_tag_rcv,
+};

net/dsa/tag_dsa.c

@@ -0,0 +1,191 @@
+/*
+ * net/dsa/tag_dsa.c - (Non-ethertype) DSA tagging
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include "dsa_priv.h"
+
+#define DSA_HLEN	4
+
+static netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	u8 *dsa_header;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	/*
+	 * Convert the outermost 802.1q tag to a DSA tag for tagged
+	 * packets, or insert a DSA tag between the addresses and
+	 * the ethertype field for untagged packets.
+	 */
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		if (skb_cow_head(skb, 0) < 0)
+			goto out_free;
+
+		/*
+		 * Construct tagged FROM_CPU DSA tag from 802.1q tag.
+		 */
+		dsa_header = skb->data + 2 * ETH_ALEN;
+		dsa_header[0] = 0x60 | p->parent->index;
+		dsa_header[1] = p->port << 3;
+
+		/*
+		 * Move CFI field from byte 2 to byte 1.
+		 */
+		if (dsa_header[2] & 0x10) {
+			dsa_header[1] |= 0x01;
+			dsa_header[2] &= ~0x10;
+		}
+	} else {
+		if (skb_cow_head(skb, DSA_HLEN) < 0)
+			goto out_free;
+		skb_push(skb, DSA_HLEN);
+
+		memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
+
+		/*
+		 * Construct untagged FROM_CPU DSA tag.
+		 */
+		dsa_header = skb->data + 2 * ETH_ALEN;
+		dsa_header[0] = 0x40 | p->parent->index;
+		dsa_header[1] = p->port << 3;
+		dsa_header[2] = 0x00;
+		dsa_header[3] = 0x00;
+	}
+
+	skb->protocol = htons(ETH_P_DSA);
+
+	skb->dev = p->parent->dst->master_netdev;
+	dev_queue_xmit(skb);
+
+	return NETDEV_TX_OK;
+
+out_free:
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static int dsa_rcv(struct sk_buff *skb, struct net_device *dev,
+		   struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst = dev->dsa_ptr;
+	struct dsa_switch *ds;
+	u8 *dsa_header;
+	int source_device;
+	int source_port;
+
+	if (unlikely(dst == NULL))
+		goto out_drop;
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, DSA_HLEN)))
+		goto out_drop;
+
+	/*
+	 * The ethertype field is part of the DSA header.
+	 */
+	dsa_header = skb->data - 2;
+
+	/*
+	 * Check that frame type is either TO_CPU or FORWARD.
+	 */
+	if ((dsa_header[0] & 0xc0) != 0x00 && (dsa_header[0] & 0xc0) != 0xc0)
+		goto out_drop;
+
+	/*
+	 * Determine source device and port.
+	 */
+	source_device = dsa_header[0] & 0x1f;
+	source_port = (dsa_header[1] >> 3) & 0x1f;
+
+	/*
+	 * Check that the source device exists and that the source
+	 * port is a registered DSA port.
+	 */
+	if (source_device >= dst->pd->nr_chips)
+		goto out_drop;
+	ds = dst->ds[source_device];
+	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+		goto out_drop;
+
+	/*
+	 * Convert the DSA header to an 802.1q header if the 'tagged'
+	 * bit in the DSA header is set.  If the 'tagged' bit is clear,
+	 * delete the DSA header entirely.
+	 */
+	if (dsa_header[0] & 0x20) {
+		u8 new_header[4];
+
+		/*
+		 * Insert 802.1q ethertype and copy the VLAN-related
+		 * fields, but clear the bit that will hold CFI (since
+		 * DSA uses that bit location for another purpose).
+		 */
+		new_header[0] = (ETH_P_8021Q >> 8) & 0xff;
+		new_header[1] = ETH_P_8021Q & 0xff;
+		new_header[2] = dsa_header[2] & ~0x10;
+		new_header[3] = dsa_header[3];
+
+		/*
+		 * Move CFI bit from its place in the DSA header to
+		 * its 802.1q-designated place.
+		 */
+		if (dsa_header[1] & 0x01)
+			new_header[2] |= 0x10;
+
+		/*
+		 * Update packet checksum if skb is CHECKSUM_COMPLETE.
+		 */
+		if (skb->ip_summed == CHECKSUM_COMPLETE) {
+			__wsum c = skb->csum;
+			c = csum_add(c, csum_partial(new_header + 2, 2, 0));
+			c = csum_sub(c, csum_partial(dsa_header + 2, 2, 0));
+			skb->csum = c;
+		}
+
+		memcpy(dsa_header, new_header, DSA_HLEN);
+	} else {
+		/*
+		 * Remove DSA tag and update checksum.
+		 */
+		skb_pull_rcsum(skb, DSA_HLEN);
+		memmove(skb->data - ETH_HLEN,
+			skb->data - ETH_HLEN - DSA_HLEN,
+			2 * ETH_ALEN);
+	}
+
+	skb->dev = ds->ports[source_port];
+	skb_push(skb, ETH_HLEN);
+	skb->pkt_type = PACKET_HOST;
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	skb->dev->stats.rx_packets++;
+	skb->dev->stats.rx_bytes += skb->len;
+
+	netif_receive_skb(skb);
+
+	return 0;
+
+out_drop:
+	kfree_skb(skb);
+out:
+	return 0;
+}
+
+const struct dsa_device_ops dsa_netdev_ops = {
+	.xmit	= dsa_xmit,
+	.rcv	= dsa_rcv,
+};

net/dsa/tag_edsa.c

@@ -0,0 +1,210 @@
+/*
+ * net/dsa/tag_edsa.c - Ethertype DSA tagging
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include "dsa_priv.h"
+
+#define DSA_HLEN	4
+#define EDSA_HLEN	8
+
+static netdev_tx_t edsa_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	u8 *edsa_header;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	/*
+	 * Convert the outermost 802.1q tag to a DSA tag and prepend
+	 * a DSA ethertype field is the packet is tagged, or insert
+	 * a DSA ethertype plus DSA tag between the addresses and the
+	 * current ethertype field if the packet is untagged.
+	 */
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		if (skb_cow_head(skb, DSA_HLEN) < 0)
+			goto out_free;
+		skb_push(skb, DSA_HLEN);
+
+		memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
+
+		/*
+		 * Construct tagged FROM_CPU DSA tag from 802.1q tag.
+		 */
+		edsa_header = skb->data + 2 * ETH_ALEN;
+		edsa_header[0] = (ETH_P_EDSA >> 8) & 0xff;
+		edsa_header[1] = ETH_P_EDSA & 0xff;
+		edsa_header[2] = 0x00;
+		edsa_header[3] = 0x00;
+		edsa_header[4] = 0x60 | p->parent->index;
+		edsa_header[5] = p->port << 3;
+
+		/*
+		 * Move CFI field from byte 6 to byte 5.
+		 */
+		if (edsa_header[6] & 0x10) {
+			edsa_header[5] |= 0x01;
+			edsa_header[6] &= ~0x10;
+		}
+	} else {
+		if (skb_cow_head(skb, EDSA_HLEN) < 0)
+			goto out_free;
+		skb_push(skb, EDSA_HLEN);
+
+		memmove(skb->data, skb->data + EDSA_HLEN, 2 * ETH_ALEN);
+
+		/*
+		 * Construct untagged FROM_CPU DSA tag.
+		 */
+		edsa_header = skb->data + 2 * ETH_ALEN;
+		edsa_header[0] = (ETH_P_EDSA >> 8) & 0xff;
+		edsa_header[1] = ETH_P_EDSA & 0xff;
+		edsa_header[2] = 0x00;
+		edsa_header[3] = 0x00;
+		edsa_header[4] = 0x40 | p->parent->index;
+		edsa_header[5] = p->port << 3;
+		edsa_header[6] = 0x00;
+		edsa_header[7] = 0x00;
+	}
+
+	skb->protocol = htons(ETH_P_EDSA);
+
+	skb->dev = p->parent->dst->master_netdev;
+	dev_queue_xmit(skb);
+
+	return NETDEV_TX_OK;
+
+out_free:
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static int edsa_rcv(struct sk_buff *skb, struct net_device *dev,
+		    struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst = dev->dsa_ptr;
+	struct dsa_switch *ds;
+	u8 *edsa_header;
+	int source_device;
+	int source_port;
+
+	if (unlikely(dst == NULL))
+		goto out_drop;
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		goto out;
+
+	if (unlikely(!pskb_may_pull(skb, EDSA_HLEN)))
+		goto out_drop;
+
+	/*
+	 * Skip the two null bytes after the ethertype.
+	 */
+	edsa_header = skb->data + 2;
+
+	/*
+	 * Check that frame type is either TO_CPU or FORWARD.
+	 */
+	if ((edsa_header[0] & 0xc0) != 0x00 && (edsa_header[0] & 0xc0) != 0xc0)
+		goto out_drop;
+
+	/*
+	 * Determine source device and port.
+	 */
+	source_device = edsa_header[0] & 0x1f;
+	source_port = (edsa_header[1] >> 3) & 0x1f;
+
+	/*
+	 * Check that the source device exists and that the source
+	 * port is a registered DSA port.
+	 */
+	if (source_device >= dst->pd->nr_chips)
+		goto out_drop;
+	ds = dst->ds[source_device];
+	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+		goto out_drop;
+
+	/*
+	 * If the 'tagged' bit is set, convert the DSA tag to a 802.1q
+	 * tag and delete the ethertype part.  If the 'tagged' bit is
+	 * clear, delete the ethertype and the DSA tag parts.
+	 */
+	if (edsa_header[0] & 0x20) {
+		u8 new_header[4];
+
+		/*
+		 * Insert 802.1q ethertype and copy the VLAN-related
+		 * fields, but clear the bit that will hold CFI (since
+		 * DSA uses that bit location for another purpose).
+		 */
+		new_header[0] = (ETH_P_8021Q >> 8) & 0xff;
+		new_header[1] = ETH_P_8021Q & 0xff;
+		new_header[2] = edsa_header[2] & ~0x10;
+		new_header[3] = edsa_header[3];
+
+		/*
+		 * Move CFI bit from its place in the DSA header to
+		 * its 802.1q-designated place.
+		 */
+		if (edsa_header[1] & 0x01)
+			new_header[2] |= 0x10;
+
+		skb_pull_rcsum(skb, DSA_HLEN);
+
+		/*
+		 * Update packet checksum if skb is CHECKSUM_COMPLETE.
+		 */
+		if (skb->ip_summed == CHECKSUM_COMPLETE) {
+			__wsum c = skb->csum;
+			c = csum_add(c, csum_partial(new_header + 2, 2, 0));
+			c = csum_sub(c, csum_partial(edsa_header + 2, 2, 0));
+			skb->csum = c;
+		}
+
+		memcpy(edsa_header, new_header, DSA_HLEN);
+
+		memmove(skb->data - ETH_HLEN,
+			skb->data - ETH_HLEN - DSA_HLEN,
+			2 * ETH_ALEN);
+	} else {
+		/*
+		 * Remove DSA tag and update checksum.
+		 */
+		skb_pull_rcsum(skb, EDSA_HLEN);
+		memmove(skb->data - ETH_HLEN,
+			skb->data - ETH_HLEN - EDSA_HLEN,
+			2 * ETH_ALEN);
+	}
+
+	skb->dev = ds->ports[source_port];
+	skb_push(skb, ETH_HLEN);
+	skb->pkt_type = PACKET_HOST;
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	skb->dev->stats.rx_packets++;
+	skb->dev->stats.rx_bytes += skb->len;
+
+	netif_receive_skb(skb);
+
+	return 0;
+
+out_drop:
+	kfree_skb(skb);
+out:
+	return 0;
+}
+
+const struct dsa_device_ops edsa_netdev_ops = {
+	.xmit	= edsa_xmit,
+	.rcv	= edsa_rcv,
+};

net/dsa/tag_trailer.c

@@ -0,0 +1,119 @@
+/*
+ * net/dsa/tag_trailer.c - Trailer tag format handling
+ * Copyright (c) 2008-2009 Marvell Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include "dsa_priv.h"
+
+static netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct sk_buff *nskb;
+	int padlen;
+	u8 *trailer;
+
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
+	/*
+	 * We have to make sure that the trailer ends up as the very
+	 * last 4 bytes of the packet.  This means that we have to pad
+	 * the packet to the minimum ethernet frame size, if necessary,
+	 * before adding the trailer.
+	 */
+	padlen = 0;
+	if (skb->len < 60)
+		padlen = 60 - skb->len;
+
+	nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC);
+	if (nskb == NULL) {
+		kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+	skb_reserve(nskb, NET_IP_ALIGN);
+
+	skb_reset_mac_header(nskb);
+	skb_set_network_header(nskb, skb_network_header(skb) - skb->head);
+	skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head);
+	skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
+	kfree_skb(skb);
+
+	if (padlen) {
+		u8 *pad = skb_put(nskb, padlen);
+		memset(pad, 0, padlen);
+	}
+
+	trailer = skb_put(nskb, 4);
+	trailer[0] = 0x80;
+	trailer[1] = 1 << p->port;
+	trailer[2] = 0x10;
+	trailer[3] = 0x00;
+
+	nskb->protocol = htons(ETH_P_TRAILER);
+
+	nskb->dev = p->parent->dst->master_netdev;
+	dev_queue_xmit(nskb);
+
+	return NETDEV_TX_OK;
+}
+
+static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
+		       struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct dsa_switch_tree *dst = dev->dsa_ptr;
+	struct dsa_switch *ds;
+	u8 *trailer;
+	int source_port;
+
+	if (unlikely(dst == NULL))
+		goto out_drop;
+	ds = dst->ds[0];
+
+	skb = skb_unshare(skb, GFP_ATOMIC);
+	if (skb == NULL)
+		goto out;
+
+	if (skb_linearize(skb))
+		goto out_drop;
+
+	trailer = skb_tail_pointer(skb) - 4;
+	if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
+	    (trailer[3] & 0xef) != 0x00 || trailer[3] != 0x00)
+		goto out_drop;
+
+	source_port = trailer[1] & 7;
+	if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
+		goto out_drop;
+
+	pskb_trim_rcsum(skb, skb->len - 4);
+
+	skb->dev = ds->ports[source_port];
+	skb_push(skb, ETH_HLEN);
+	skb->pkt_type = PACKET_HOST;
+	skb->protocol = eth_type_trans(skb, skb->dev);
+
+	skb->dev->stats.rx_packets++;
+	skb->dev->stats.rx_bytes += skb->len;
+
+	netif_receive_skb(skb);
+
+	return 0;
+
+out_drop:
+	kfree_skb(skb);
+out:
+	return 0;
+}
+
+const struct dsa_device_ops trailer_netdev_ops = {
+	.xmit	= trailer_xmit,
+	.rcv	= trailer_rcv,
+};