net/dsa/dsa.c - arm/linux - Git at Google

 /*
  * 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/device.h>
 #include <linux/list.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_mdio.h>
 #include <linux/of_platform.h>
 #include <linux/of_net.h>
 #include <linux/of_gpio.h>
 #include <linux/netdevice.h>
 #include <linux/sysfs.h>
 #include <linux/phy_fixed.h>
 #include <linux/gpio/consumer.h>
 #include <linux/etherdevice.h>

 #include "dsa_priv.h"

 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
 					    struct net_device *dev)
 {
 	/* Just return the original SKB */
 	return skb;
 }

 static const struct dsa_device_ops none_ops = {
 	.xmit	= dsa_slave_notag_xmit,
 	.rcv	= NULL,
 };

 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
 #ifdef CONFIG_NET_DSA_TAG_BRCM
 	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_DSA
 	[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_EDSA
 	[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_KSZ
 	[DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_LAN9303
 	[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_MTK
 	[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_QCA
 	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
 #endif
 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 	[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
 #endif
 	[DSA_TAG_PROTO_NONE] = &none_ops,
 };

 int dsa_cpu_dsa_setup(struct dsa_port *port)
 {
 	struct device_node *port_dn = port->dn;
 	struct dsa_switch *ds = port->ds;
 	struct phy_device *phydev;
 	int ret, mode;

 	if (of_phy_is_fixed_link(port_dn)) {
 		ret = of_phy_register_fixed_link(port_dn);
 		if (ret) {
 			dev_err(ds->dev, "failed to register fixed PHY\n");
 			return ret;
 		}
 		phydev = of_phy_find_device(port_dn);

 		mode = of_get_phy_mode(port_dn);
 		if (mode < 0)
 			mode = PHY_INTERFACE_MODE_NA;
 		phydev->interface = mode;

 		genphy_config_init(phydev);
 		genphy_read_status(phydev);
 		if (ds->ops->adjust_link)
 			ds->ops->adjust_link(ds, port->index, phydev);

 		put_device(&phydev->mdio.dev);
 	}

 	return 0;
 }

 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
 {
 	const struct dsa_device_ops *ops;

 	if (tag_protocol >= DSA_TAG_LAST)
 		return ERR_PTR(-EINVAL);
 	ops = dsa_device_ops[tag_protocol];

 	if (!ops)
 		return ERR_PTR(-ENOPROTOOPT);

 	return ops;
 }

 int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
 {
 	struct dsa_switch *ds = cpu_dp->ds;
 	struct net_device *master;
 	struct ethtool_ops *cpu_ops;

 	master = cpu_dp->netdev;

 	cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 	if (!cpu_ops)
 		return -ENOMEM;

 	memcpy(&cpu_dp->ethtool_ops, master->ethtool_ops,
 	       sizeof(struct ethtool_ops));
 	cpu_dp->orig_ethtool_ops = master->ethtool_ops;
 	memcpy(cpu_ops, &cpu_dp->ethtool_ops,
 	       sizeof(struct ethtool_ops));
 	dsa_cpu_port_ethtool_init(cpu_ops);
 	master->ethtool_ops = cpu_ops;

 	return 0;
 }

 void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
 {
 	cpu_dp->netdev->ethtool_ops = cpu_dp->orig_ethtool_ops;
 }

 void dsa_cpu_dsa_destroy(struct dsa_port *port)
 {
 	struct device_node *port_dn = port->dn;

 	if (of_phy_is_fixed_link(port_dn))
 		of_phy_deregister_fixed_link(port_dn);
 }

 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 net_device *dsa_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;
 }
 EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 			  struct packet_type *pt, struct net_device *unused)
 {
 	struct dsa_switch_tree *dst = dev->dsa_ptr;
 	struct sk_buff *nskb = NULL;
 	struct pcpu_sw_netstats *s;
 	struct dsa_slave_priv *p;

 	if (unlikely(dst == NULL)) {
 		kfree_skb(skb);
 		return 0;
 	}

 	skb = skb_unshare(skb, GFP_ATOMIC);
 	if (!skb)
 		return 0;

 	nskb = dst->rcv(skb, dev, pt);
 	if (!nskb) {
 		kfree_skb(skb);
 		return 0;
 	}

 	skb = nskb;
 	p = netdev_priv(skb->dev);
 	skb_push(skb, ETH_HLEN);
 	skb->pkt_type = PACKET_HOST;
 	skb->protocol = eth_type_trans(skb, skb->dev);

 	s = this_cpu_ptr(p->stats64);
 	u64_stats_update_begin(&s->syncp);
 	s->rx_packets++;
 	s->rx_bytes += skb->len;
 	u64_stats_update_end(&s->syncp);

 	netif_receive_skb(skb);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
 {
 	return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
 }

 int dsa_switch_suspend(struct dsa_switch *ds)
 {
 	int i, ret = 0;

 	/* Suspend slave network devices */
 	for (i = 0; i < ds->num_ports; i++) {
 		if (!dsa_is_port_initialized(ds, i))
 			continue;

 		ret = dsa_slave_suspend(ds->ports[i].netdev);
 		if (ret)
 			return ret;
 	}

 	if (ds->ops->suspend)
 		ret = ds->ops->suspend(ds);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(dsa_switch_suspend);

 int dsa_switch_resume(struct dsa_switch *ds)
 {
 	int i, ret = 0;

 	if (ds->ops->resume)
 		ret = ds->ops->resume(ds);

 	if (ret)
 		return ret;

 	/* Resume slave network devices */
 	for (i = 0; i < ds->num_ports; i++) {
 		if (!dsa_is_port_initialized(ds, i))
 			continue;

 		ret = dsa_slave_resume(ds->ports[i].netdev);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 #endif

 static struct packet_type dsa_pack_type __read_mostly = {
 	.type	= cpu_to_be16(ETH_P_XDSA),
 	.func	= dsa_switch_rcv,
 };

 static struct workqueue_struct *dsa_owq;

 bool dsa_schedule_work(struct work_struct *work)
 {
 	return queue_work(dsa_owq, work);
 }

 static int __init dsa_init_module(void)
 {
 	int rc;

 	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
 					  WQ_MEM_RECLAIM);
 	if (!dsa_owq)
 		return -ENOMEM;

 	rc = dsa_slave_register_notifier();
 	if (rc)
 		return rc;

 	rc = dsa_legacy_register();
 	if (rc)
 		return rc;

 	dev_add_pack(&dsa_pack_type);

 	return 0;
 }
 module_init(dsa_init_module);

 static void __exit dsa_cleanup_module(void)
 {
 	dsa_slave_unregister_notifier();
 	dev_remove_pack(&dsa_pack_type);
 	dsa_legacy_unregister();
 	destroy_workqueue(dsa_owq);
 }
 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.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/device.h>
	#include <linux/list.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_mdio.h>
	#include <linux/of_platform.h>
	#include <linux/of_net.h>
	#include <linux/of_gpio.h>
	#include <linux/netdevice.h>
	#include <linux/sysfs.h>
	#include <linux/phy_fixed.h>
	#include <linux/gpio/consumer.h>
	#include <linux/etherdevice.h>

	#include "dsa_priv.h"

	static struct sk_buff dsa_slave_notag_xmit(struct sk_buff skb,
	struct net_device *dev)
	{
	/* Just return the original SKB */
	return skb;
	}

	static const struct dsa_device_ops none_ops = {
	.xmit = dsa_slave_notag_xmit,
	.rcv = NULL,
	};

	const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
	#ifdef CONFIG_NET_DSA_TAG_BRCM
	[DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_DSA
	[DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_EDSA
	[DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_KSZ
	[DSA_TAG_PROTO_KSZ] = &ksz_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_LAN9303
	[DSA_TAG_PROTO_LAN9303] = &lan9303_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_MTK
	[DSA_TAG_PROTO_MTK] = &mtk_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_QCA
	[DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
	#endif
	#ifdef CONFIG_NET_DSA_TAG_TRAILER
	[DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
	#endif
	[DSA_TAG_PROTO_NONE] = &none_ops,
	};

	int dsa_cpu_dsa_setup(struct dsa_port *port)
	{
	struct device_node *port_dn = port->dn;
	struct dsa_switch *ds = port->ds;
	struct phy_device *phydev;
	int ret, mode;

	if (of_phy_is_fixed_link(port_dn)) {
	ret = of_phy_register_fixed_link(port_dn);
	if (ret) {
	dev_err(ds->dev, "failed to register fixed PHY\n");
	return ret;
	}
	phydev = of_phy_find_device(port_dn);

	mode = of_get_phy_mode(port_dn);
	if (mode < 0)
	mode = PHY_INTERFACE_MODE_NA;
	phydev->interface = mode;

	genphy_config_init(phydev);
	genphy_read_status(phydev);
	if (ds->ops->adjust_link)
	ds->ops->adjust_link(ds, port->index, phydev);

	put_device(&phydev->mdio.dev);
	}

	return 0;
	}

	const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
	{
	const struct dsa_device_ops *ops;

	if (tag_protocol >= DSA_TAG_LAST)
	return ERR_PTR(-EINVAL);
	ops = dsa_device_ops[tag_protocol];

	if (!ops)
	return ERR_PTR(-ENOPROTOOPT);

	return ops;
	}

	int dsa_cpu_port_ethtool_setup(struct dsa_port *cpu_dp)
	{
	struct dsa_switch *ds = cpu_dp->ds;
	struct net_device *master;
	struct ethtool_ops *cpu_ops;

	master = cpu_dp->netdev;

	cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
	if (!cpu_ops)
	return -ENOMEM;

	memcpy(&cpu_dp->ethtool_ops, master->ethtool_ops,
	sizeof(struct ethtool_ops));
	cpu_dp->orig_ethtool_ops = master->ethtool_ops;
	memcpy(cpu_ops, &cpu_dp->ethtool_ops,
	sizeof(struct ethtool_ops));
	dsa_cpu_port_ethtool_init(cpu_ops);
	master->ethtool_ops = cpu_ops;

	return 0;
	}

	void dsa_cpu_port_ethtool_restore(struct dsa_port *cpu_dp)
	{
	cpu_dp->netdev->ethtool_ops = cpu_dp->orig_ethtool_ops;
	}

	void dsa_cpu_dsa_destroy(struct dsa_port *port)
	{
	struct device_node *port_dn = port->dn;

	if (of_phy_is_fixed_link(port_dn))
	of_phy_deregister_fixed_link(port_dn);
	}

	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 net_device dsa_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;
	}
	EXPORT_SYMBOL_GPL(dsa_dev_to_net_device);

	static int dsa_switch_rcv(struct sk_buff skb, struct net_device dev,
	struct packet_type pt, struct net_device unused)
	{
	struct dsa_switch_tree *dst = dev->dsa_ptr;
	struct sk_buff *nskb = NULL;
	struct pcpu_sw_netstats *s;
	struct dsa_slave_priv *p;

	if (unlikely(dst == NULL)) {
	kfree_skb(skb);
	return 0;
	}

	skb = skb_unshare(skb, GFP_ATOMIC);
	if (!skb)
	return 0;

	nskb = dst->rcv(skb, dev, pt);
	if (!nskb) {
	kfree_skb(skb);
	return 0;
	}

	skb = nskb;
	p = netdev_priv(skb->dev);
	skb_push(skb, ETH_HLEN);
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, skb->dev);

	s = this_cpu_ptr(p->stats64);
	u64_stats_update_begin(&s->syncp);
	s->rx_packets++;
	s->rx_bytes += skb->len;
	u64_stats_update_end(&s->syncp);

	netif_receive_skb(skb);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static bool dsa_is_port_initialized(struct dsa_switch *ds, int p)
	{
	return ds->enabled_port_mask & (1 << p) && ds->ports[p].netdev;
	}

	int dsa_switch_suspend(struct dsa_switch *ds)
	{
	int i, ret = 0;

	/* Suspend slave network devices */
	for (i = 0; i < ds->num_ports; i++) {
	if (!dsa_is_port_initialized(ds, i))
	continue;

	ret = dsa_slave_suspend(ds->ports[i].netdev);
	if (ret)
	return ret;
	}

	if (ds->ops->suspend)
	ret = ds->ops->suspend(ds);

	return ret;
	}
	EXPORT_SYMBOL_GPL(dsa_switch_suspend);

	int dsa_switch_resume(struct dsa_switch *ds)
	{
	int i, ret = 0;

	if (ds->ops->resume)
	ret = ds->ops->resume(ds);

	if (ret)
	return ret;

	/* Resume slave network devices */
	for (i = 0; i < ds->num_ports; i++) {
	if (!dsa_is_port_initialized(ds, i))
	continue;

	ret = dsa_slave_resume(ds->ports[i].netdev);
	if (ret)
	return ret;
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(dsa_switch_resume);
	#endif

	static struct packet_type dsa_pack_type __read_mostly = {
	.type = cpu_to_be16(ETH_P_XDSA),
	.func = dsa_switch_rcv,
	};

	static struct workqueue_struct *dsa_owq;

	bool dsa_schedule_work(struct work_struct *work)
	{
	return queue_work(dsa_owq, work);
	}

	static int __init dsa_init_module(void)
	{
	int rc;

	dsa_owq = alloc_ordered_workqueue("dsa_ordered",
	WQ_MEM_RECLAIM);
	if (!dsa_owq)
	return -ENOMEM;

	rc = dsa_slave_register_notifier();
	if (rc)
	return rc;

	rc = dsa_legacy_register();
	if (rc)
	return rc;

	dev_add_pack(&dsa_pack_type);

	return 0;
	}
	module_init(dsa_init_module);

	static void __exit dsa_cleanup_module(void)
	{
	dsa_slave_unregister_notifier();
	dev_remove_pack(&dsa_pack_type);
	dsa_legacy_unregister();
	destroy_workqueue(dsa_owq);
	}
	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");