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Release 4.8 net/dsa/dsa.c

Directory: net/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/ctype.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#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 <linux/of_net.h>
#include <linux/of_gpio.h>
#include <linux/sysfs.h>
#include <linux/phy_fixed.h>
#include <linux/gpio/consumer.h>
#include "dsa_priv.h"


char dsa_driver_version[] = "0.1";


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

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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_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_TRAILER [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops, #endif #ifdef CONFIG_NET_DSA_TAG_BRCM [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops, #endif [DSA_TAG_PROTO_NONE] = &none_ops, }; /* 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); }

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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); }

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EXPORT_SYMBOL_GPL(unregister_switch_driver);
static struct dsa_switch_driver * dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr, const char **_name, void **priv) { struct dsa_switch_driver *ret; struct list_head *list; const 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(parent, host_dev, sw_addr, priv); if (name != NULL) { ret = drv; break; } } mutex_unlock(&dsa_switch_drivers_mutex); *_name = name; return ret; }

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/* hwmon support ************************************************************/ #ifdef CONFIG_NET_DSA_HWMON
static ssize_t temp1_input_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dsa_switch *ds = dev_get_drvdata(dev); int temp, ret; ret = ds->drv->get_temp(ds, &temp); if (ret < 0) return ret; return sprintf(buf, "%d\n", temp * 1000); }

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static DEVICE_ATTR_RO(temp1_input);
static ssize_t temp1_max_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dsa_switch *ds = dev_get_drvdata(dev); int temp, ret; ret = ds->drv->get_temp_limit(ds, &temp); if (ret < 0) return ret; return sprintf(buf, "%d\n", temp * 1000); }

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static ssize_t temp1_max_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dsa_switch *ds = dev_get_drvdata(dev); int temp, ret; ret = kstrtoint(buf, 0, &temp); if (ret < 0) return ret; ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000)); if (ret < 0) return ret; return count; }

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static DEVICE_ATTR_RW(temp1_max);
static ssize_t temp1_max_alarm_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dsa_switch *ds = dev_get_drvdata(dev); bool alarm; int ret; ret = ds->drv->get_temp_alarm(ds, &alarm); if (ret < 0) return ret; return sprintf(buf, "%d\n", alarm); }

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static DEVICE_ATTR_RO(temp1_max_alarm); static struct attribute *dsa_hwmon_attrs[] = { &dev_attr_temp1_input.attr, /* 0 */ &dev_attr_temp1_max.attr, /* 1 */ &dev_attr_temp1_max_alarm.attr, /* 2 */ NULL };
static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj, struct attribute *attr, int index) { struct device *dev = container_of(kobj, struct device, kobj); struct dsa_switch *ds = dev_get_drvdata(dev); struct dsa_switch_driver *drv = ds->drv; umode_t mode = attr->mode; if (index == 1) { if (!drv->get_temp_limit) mode = 0; else if (!drv->set_temp_limit) mode &= ~S_IWUSR; } else if (index == 2 && !drv->get_temp_alarm) { mode = 0; } return mode; }

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static const struct attribute_group dsa_hwmon_group = { .attrs = dsa_hwmon_attrs, .is_visible = dsa_hwmon_attrs_visible, }; __ATTRIBUTE_GROUPS(dsa_hwmon); #endif /* CONFIG_NET_DSA_HWMON */ /* basic switch operations **************************************************/
int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev, struct device_node *port_dn, int port) { 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(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->drv->adjust_link) ds->drv->adjust_link(ds, port, phydev); } return 0; }

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static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev) { struct device_node *port_dn; int ret, port; for (port = 0; port < DSA_MAX_PORTS; port++) { if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))) continue; port_dn = ds->ports[port].dn; ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port); if (ret) return ret; } return 0; }

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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; }

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int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds) { struct net_device *master; struct ethtool_ops *cpu_ops; master = ds->dst->master_netdev; if (ds->master_netdev) master = ds->master_netdev; cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL); if (!cpu_ops) return -ENOMEM; memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops, sizeof(struct ethtool_ops)); ds->dst->master_orig_ethtool_ops = master->ethtool_ops; memcpy(cpu_ops, &ds->dst->master_ethtool_ops, sizeof(struct ethtool_ops)); dsa_cpu_port_ethtool_init(cpu_ops); master->ethtool_ops = cpu_ops; return 0; }

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void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds) { struct net_device *master; master = ds->dst->master_netdev; if (ds->master_netdev) master = ds->master_netdev; master->ethtool_ops = ds->dst->master_orig_ethtool_ops; }

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static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent) { struct dsa_switch_driver *drv = ds->drv; struct dsa_switch_tree *dst = ds->dst; struct dsa_chip_data *cd = ds->cd; bool valid_name_found = false; int index = ds->index; int i, ret; /* * Validate supplied switch configuration. */ for (i = 0; i < DSA_MAX_PORTS; i++) { char *name; name = cd->port_names[i]; if (name == NULL) continue; if (!strcmp(name, "cpu")) { if (dst->cpu_switch != -1) { netdev_err(dst->master_netdev, "multiple cpu ports?!\n"); ret = -EINVAL; goto out; } dst->cpu_switch = index; dst->cpu_port = i; ds->cpu_port_mask |= 1 << i; } else if (!strcmp(name, "dsa")) { ds->dsa_port_mask |= 1 << i; } else { ds->enabled_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->enabled_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) { dst->tag_ops = dsa_resolve_tag_protocol(drv->tag_protocol); if (IS_ERR(dst->tag_ops)) { ret = PTR_ERR(dst->tag_ops); goto out; } dst->rcv = dst->tag_ops->rcv; } memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable)); /* * 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; if (!ds->slave_mii_bus && drv->phy_read) { ds->slave_mii_bus = devm_mdiobus_alloc(parent); if (!ds->slave_mii_bus) { ret = -ENOMEM; goto out; } dsa_slave_mii_bus_init(ds); ret = mdiobus_register(ds->slave_mii_bus); if (ret < 0) goto out; } /* * Create network devices for physical switch ports. */ for (i = 0; i < DSA_MAX_PORTS; i++) { ds->ports[i].dn = cd->port_dn[i]; if (!(ds->enabled_port_mask & (1 << i))) continue; ret = dsa_slave_create(ds, parent, i, cd->port_names[i]); if (ret < 0) { netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n", index, i, cd->port_names[i], ret); ret = 0; } } /* Perform configuration of the CPU and DSA ports */ ret = dsa_cpu_dsa_setups(ds, parent); if (ret < 0) { netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n", index); ret = 0; } ret = dsa_cpu_port_ethtool_setup(ds); if (ret) return ret; #ifdef CONFIG_NET_DSA_HWMON /* If the switch provides a temperature sensor, * register with hardware monitoring subsystem. * Treat registration error as non-fatal and ignore it. */ if (drv->get_temp) { const char *netname = netdev_name(dst->master_netdev); char hname[IFNAMSIZ + 1]; int i, j; /* Create valid hwmon 'name' attribute */ for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) { if (isalnum(netname[i])) hname[j++] = netname[i]; } hname[j] = '\0'; scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d", hname, index); ds->hwmon_dev = hwmon_device_register_with_groups(NULL, ds->hwmon_name, ds, dsa_hwmon_groups); if (IS_ERR(ds->hwmon_dev)) ds->hwmon_dev = NULL; } #endif /* CONFIG_NET_DSA_HWMON */ return ret; out: return ret; }

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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 *cd = dst->pd->chip + index; struct dsa_switch_driver *drv; struct dsa_switch *ds; int ret; const char *name; void *priv; /* * Probe for switch model. */ drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv); if (drv == NULL) { netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n", index); return ERR_PTR(-EINVAL); } netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n", index, name); /* * Allocate and initialise switch state. */ ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL); if (ds == NULL) return ERR_PTR(-ENOMEM); ds->dst = dst; ds->index = index; ds->cd = cd; ds->drv = drv; ds->priv = priv; ds->dev = parent; ret = dsa_switch_setup_one(ds, parent); if (ret) return ERR_PTR(ret); return ds; }

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void dsa_cpu_dsa_destroy(struct device_node *port_dn) { struct phy_device *phydev; if (of_phy_is_fixed_link(port_dn)) { phydev = of_phy_find_device(port_dn); if (phydev) { phy_device_free(phydev); fixed_phy_unregister(phydev); } } }

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static void dsa_switch_destroy(struct dsa_switch *ds) { int port; #ifdef CONFIG_NET_DSA_HWMON if (ds->hwmon_dev) hwmon_device_unregister(ds->hwmon_dev); #endif /* Destroy network devices for physical switch ports. */ for (port = 0; port < DSA_MAX_PORTS; port++) { if (!(ds->enabled_port_mask & (1 << port))) continue; if (!ds->ports[port].netdev) continue; dsa_slave_destroy(ds->ports[port].netdev); } /* Disable configuration of the CPU and DSA ports */ for (port = 0; port < DSA_MAX_PORTS; port++) { if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))) continue; dsa_cpu_dsa_destroy(ds->ports[port].dn); /* Clearing a bit which is not set does no harm */ ds->cpu_port_mask |= ~(1 << port); ds->dsa_port_mask |= ~(1 << port); } if (ds->slave_mii_bus && ds->drv->phy_read) mdiobus_unregister(ds->slave_mii_bus); }

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#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 (!dsa_is_port_initialized(ds, i)) continue; ret = dsa_slave_suspend(ds->ports[i].netdev); if (ret) return ret; } if (ds->drv->suspend) ret = ds->drv->suspend(ds); return ret; }

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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 (!dsa_is_port_initialized(ds, i)) continue; ret = dsa_slave_resume(ds->ports[i].netdev); if (ret) return ret; } return 0; }

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#endif /* 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; }

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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); }

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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; }

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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