![Florian Fainelli](/assets/img/avatar_default.png)
This patch changes dsa_switch_setup() to ensure that at least one valid valid port name is specified and will bail out with an error in case we walked the maximum number of port with a valid port name found. Signed-off-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David S. Miller <davem@davemloft.net>
445 lines
9.3 KiB
C
445 lines
9.3 KiB
C
/*
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* net/dsa/dsa.c - Hardware switch handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/list.h>
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#include <linux/netdevice.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <net/dsa.h>
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#include "dsa_priv.h"
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char dsa_driver_version[] = "0.1";
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/* switch driver registration ***********************************************/
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static DEFINE_MUTEX(dsa_switch_drivers_mutex);
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static LIST_HEAD(dsa_switch_drivers);
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void register_switch_driver(struct dsa_switch_driver *drv)
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{
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mutex_lock(&dsa_switch_drivers_mutex);
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list_add_tail(&drv->list, &dsa_switch_drivers);
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mutex_unlock(&dsa_switch_drivers_mutex);
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}
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EXPORT_SYMBOL_GPL(register_switch_driver);
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void unregister_switch_driver(struct dsa_switch_driver *drv)
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{
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mutex_lock(&dsa_switch_drivers_mutex);
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list_del_init(&drv->list);
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mutex_unlock(&dsa_switch_drivers_mutex);
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}
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EXPORT_SYMBOL_GPL(unregister_switch_driver);
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static struct dsa_switch_driver *
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dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
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{
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struct dsa_switch_driver *ret;
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struct list_head *list;
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char *name;
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ret = NULL;
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name = NULL;
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mutex_lock(&dsa_switch_drivers_mutex);
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list_for_each(list, &dsa_switch_drivers) {
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struct dsa_switch_driver *drv;
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drv = list_entry(list, struct dsa_switch_driver, list);
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name = drv->probe(bus, sw_addr);
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if (name != NULL) {
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ret = drv;
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break;
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}
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}
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mutex_unlock(&dsa_switch_drivers_mutex);
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*_name = name;
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return ret;
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}
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/* basic switch operations **************************************************/
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static struct dsa_switch *
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dsa_switch_setup(struct dsa_switch_tree *dst, int index,
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struct device *parent, struct mii_bus *bus)
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{
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struct dsa_chip_data *pd = dst->pd->chip + index;
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struct dsa_switch_driver *drv;
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struct dsa_switch *ds;
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int ret;
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char *name;
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int i;
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bool valid_name_found = false;
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/*
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* Probe for switch model.
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*/
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drv = dsa_switch_probe(bus, pd->sw_addr, &name);
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if (drv == NULL) {
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printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
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dst->master_netdev->name, index);
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return ERR_PTR(-EINVAL);
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}
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printk(KERN_INFO "%s[%d]: detected a %s switch\n",
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dst->master_netdev->name, index, name);
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/*
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* Allocate and initialise switch state.
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*/
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ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
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if (ds == NULL)
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return ERR_PTR(-ENOMEM);
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ds->dst = dst;
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ds->index = index;
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ds->pd = dst->pd->chip + index;
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ds->drv = drv;
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ds->master_mii_bus = bus;
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/*
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* Validate supplied switch configuration.
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*/
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for (i = 0; i < DSA_MAX_PORTS; i++) {
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char *name;
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name = pd->port_names[i];
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if (name == NULL)
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continue;
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if (!strcmp(name, "cpu")) {
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if (dst->cpu_switch != -1) {
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printk(KERN_ERR "multiple cpu ports?!\n");
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ret = -EINVAL;
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goto out;
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}
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dst->cpu_switch = index;
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dst->cpu_port = i;
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} else if (!strcmp(name, "dsa")) {
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ds->dsa_port_mask |= 1 << i;
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} else {
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ds->phys_port_mask |= 1 << i;
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}
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valid_name_found = true;
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}
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if (!valid_name_found && i == DSA_MAX_PORTS) {
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ret = -EINVAL;
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goto out;
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}
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/*
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* If the CPU connects to this switch, set the switch tree
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* tagging protocol to the preferred tagging format of this
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* switch.
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*/
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if (ds->dst->cpu_switch == index)
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ds->dst->tag_protocol = drv->tag_protocol;
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/*
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* Do basic register setup.
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*/
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ret = drv->setup(ds);
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if (ret < 0)
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goto out;
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ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
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if (ret < 0)
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goto out;
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ds->slave_mii_bus = mdiobus_alloc();
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if (ds->slave_mii_bus == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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dsa_slave_mii_bus_init(ds);
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ret = mdiobus_register(ds->slave_mii_bus);
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if (ret < 0)
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goto out_free;
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/*
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* Create network devices for physical switch ports.
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*/
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for (i = 0; i < DSA_MAX_PORTS; i++) {
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struct net_device *slave_dev;
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if (!(ds->phys_port_mask & (1 << i)))
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continue;
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slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
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if (slave_dev == NULL) {
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printk(KERN_ERR "%s[%d]: can't create dsa "
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"slave device for port %d(%s)\n",
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dst->master_netdev->name,
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index, i, pd->port_names[i]);
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continue;
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}
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ds->ports[i] = slave_dev;
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}
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return ds;
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out_free:
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mdiobus_free(ds->slave_mii_bus);
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out:
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kfree(ds);
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return ERR_PTR(ret);
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}
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static void dsa_switch_destroy(struct dsa_switch *ds)
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{
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}
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/* link polling *************************************************************/
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static void dsa_link_poll_work(struct work_struct *ugly)
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{
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struct dsa_switch_tree *dst;
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int i;
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dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
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for (i = 0; i < dst->pd->nr_chips; i++) {
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struct dsa_switch *ds = dst->ds[i];
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if (ds != NULL && ds->drv->poll_link != NULL)
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ds->drv->poll_link(ds);
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}
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mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
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}
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static void dsa_link_poll_timer(unsigned long _dst)
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{
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struct dsa_switch_tree *dst = (void *)_dst;
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schedule_work(&dst->link_poll_work);
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}
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/* platform driver init and cleanup *****************************************/
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static int dev_is_class(struct device *dev, void *class)
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{
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if (dev->class != NULL && !strcmp(dev->class->name, class))
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return 1;
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return 0;
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}
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static struct device *dev_find_class(struct device *parent, char *class)
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{
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if (dev_is_class(parent, class)) {
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get_device(parent);
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return parent;
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}
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return device_find_child(parent, class, dev_is_class);
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}
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static struct mii_bus *dev_to_mii_bus(struct device *dev)
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{
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struct device *d;
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d = dev_find_class(dev, "mdio_bus");
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if (d != NULL) {
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struct mii_bus *bus;
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bus = to_mii_bus(d);
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put_device(d);
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return bus;
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}
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return NULL;
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}
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static struct net_device *dev_to_net_device(struct device *dev)
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{
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struct device *d;
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d = dev_find_class(dev, "net");
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if (d != NULL) {
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struct net_device *nd;
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nd = to_net_dev(d);
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dev_hold(nd);
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put_device(d);
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return nd;
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}
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return NULL;
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}
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static int dsa_probe(struct platform_device *pdev)
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{
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static int dsa_version_printed;
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struct dsa_platform_data *pd = pdev->dev.platform_data;
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struct net_device *dev;
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struct dsa_switch_tree *dst;
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int i;
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if (!dsa_version_printed++)
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printk(KERN_NOTICE "Distributed Switch Architecture "
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"driver version %s\n", dsa_driver_version);
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if (pd == NULL || pd->netdev == NULL)
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return -EINVAL;
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dev = dev_to_net_device(pd->netdev);
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if (dev == NULL)
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return -EINVAL;
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if (dev->dsa_ptr != NULL) {
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dev_put(dev);
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return -EEXIST;
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}
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dst = kzalloc(sizeof(*dst), GFP_KERNEL);
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if (dst == NULL) {
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dev_put(dev);
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, dst);
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dst->pd = pd;
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dst->master_netdev = dev;
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dst->cpu_switch = -1;
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dst->cpu_port = -1;
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for (i = 0; i < pd->nr_chips; i++) {
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struct mii_bus *bus;
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struct dsa_switch *ds;
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bus = dev_to_mii_bus(pd->chip[i].mii_bus);
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if (bus == NULL) {
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printk(KERN_ERR "%s[%d]: no mii bus found for "
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"dsa switch\n", dev->name, i);
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continue;
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}
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ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
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if (IS_ERR(ds)) {
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printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
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"instance (error %ld)\n", dev->name, i,
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PTR_ERR(ds));
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continue;
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}
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dst->ds[i] = ds;
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if (ds->drv->poll_link != NULL)
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dst->link_poll_needed = 1;
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}
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/*
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* If we use a tagging format that doesn't have an ethertype
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* field, make sure that all packets from this point on get
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* sent to the tag format's receive function.
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*/
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wmb();
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dev->dsa_ptr = (void *)dst;
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if (dst->link_poll_needed) {
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INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
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init_timer(&dst->link_poll_timer);
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dst->link_poll_timer.data = (unsigned long)dst;
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dst->link_poll_timer.function = dsa_link_poll_timer;
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dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
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add_timer(&dst->link_poll_timer);
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}
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return 0;
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}
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static int dsa_remove(struct platform_device *pdev)
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{
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struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
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int i;
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if (dst->link_poll_needed)
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del_timer_sync(&dst->link_poll_timer);
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flush_work(&dst->link_poll_work);
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for (i = 0; i < dst->pd->nr_chips; i++) {
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struct dsa_switch *ds = dst->ds[i];
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if (ds != NULL)
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dsa_switch_destroy(ds);
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}
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return 0;
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}
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static void dsa_shutdown(struct platform_device *pdev)
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{
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}
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static struct platform_driver dsa_driver = {
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.probe = dsa_probe,
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.remove = dsa_remove,
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.shutdown = dsa_shutdown,
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.driver = {
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.name = "dsa",
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.owner = THIS_MODULE,
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},
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};
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static int __init dsa_init_module(void)
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{
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int rc;
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rc = platform_driver_register(&dsa_driver);
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if (rc)
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return rc;
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#ifdef CONFIG_NET_DSA_TAG_DSA
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dev_add_pack(&dsa_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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dev_add_pack(&edsa_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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dev_add_pack(&trailer_packet_type);
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#endif
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return 0;
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}
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module_init(dsa_init_module);
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static void __exit dsa_cleanup_module(void)
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{
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#ifdef CONFIG_NET_DSA_TAG_TRAILER
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dev_remove_pack(&trailer_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_EDSA
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dev_remove_pack(&edsa_packet_type);
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#endif
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#ifdef CONFIG_NET_DSA_TAG_DSA
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dev_remove_pack(&dsa_packet_type);
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#endif
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platform_driver_unregister(&dsa_driver);
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}
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module_exit(dsa_cleanup_module);
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MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
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MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:dsa");
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