diff options
Diffstat (limited to 'net/hsr/hsr_main.c')
| -rw-r--r-- | net/hsr/hsr_main.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c new file mode 100644 index 000000000..2fd1976e5 --- /dev/null +++ b/net/hsr/hsr_main.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright 2011-2014 Autronica Fire and Security AS + * + * Author(s): + * 2011-2014 Arvid Brodin, arvid.brodin@alten.se + * + * Event handling for HSR and PRP devices. + */ + +#include <linux/netdevice.h> +#include <net/rtnetlink.h> +#include <linux/rculist.h> +#include <linux/timer.h> +#include <linux/etherdevice.h> +#include "hsr_main.h" +#include "hsr_device.h" +#include "hsr_netlink.h" +#include "hsr_framereg.h" +#include "hsr_slave.h" + +static bool hsr_slave_empty(struct hsr_priv *hsr) +{ + struct hsr_port *port; + + hsr_for_each_port(hsr, port) + if (port->type != HSR_PT_MASTER) + return false; + return true; +} + +static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct hsr_port *port, *master; + struct net_device *dev; + struct hsr_priv *hsr; + LIST_HEAD(list_kill); + int mtu_max; + int res; + + dev = netdev_notifier_info_to_dev(ptr); + port = hsr_port_get_rtnl(dev); + if (!port) { + if (!is_hsr_master(dev)) + return NOTIFY_DONE; /* Not an HSR device */ + hsr = netdev_priv(dev); + port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + if (!port) { + /* Resend of notification concerning removed device? */ + return NOTIFY_DONE; + } + } else { + hsr = port->hsr; + } + + switch (event) { + case NETDEV_UP: /* Administrative state DOWN */ + case NETDEV_DOWN: /* Administrative state UP */ + case NETDEV_CHANGE: /* Link (carrier) state changes */ + hsr_check_carrier_and_operstate(hsr); + break; + case NETDEV_CHANGENAME: + if (is_hsr_master(dev)) + hsr_debugfs_rename(dev); + break; + case NETDEV_CHANGEADDR: + if (port->type == HSR_PT_MASTER) { + /* This should not happen since there's no + * ndo_set_mac_address() for HSR devices - i.e. not + * supported. + */ + break; + } + + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + + if (port->type == HSR_PT_SLAVE_A) { + ether_addr_copy(master->dev->dev_addr, dev->dev_addr); + call_netdevice_notifiers(NETDEV_CHANGEADDR, + master->dev); + } + + /* Make sure we recognize frames from ourselves in hsr_rcv() */ + port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); + res = hsr_create_self_node(hsr, + master->dev->dev_addr, + port ? + port->dev->dev_addr : + master->dev->dev_addr); + if (res) + netdev_warn(master->dev, + "Could not update HSR node address.\n"); + break; + case NETDEV_CHANGEMTU: + if (port->type == HSR_PT_MASTER) + break; /* Handled in ndo_change_mtu() */ + mtu_max = hsr_get_max_mtu(port->hsr); + master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER); + master->dev->mtu = mtu_max; + break; + case NETDEV_UNREGISTER: + if (!is_hsr_master(dev)) { + master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER); + hsr_del_port(port); + if (hsr_slave_empty(master->hsr)) { + const struct rtnl_link_ops *ops; + + ops = master->dev->rtnl_link_ops; + ops->dellink(master->dev, &list_kill); + unregister_netdevice_many(&list_kill); + } + } + break; + case NETDEV_PRE_TYPE_CHANGE: + /* HSR works only on Ethernet devices. Refuse slave to change + * its type. + */ + return NOTIFY_BAD; + } + + return NOTIFY_DONE; +} + +struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt) +{ + struct hsr_port *port; + + hsr_for_each_port(hsr, port) + if (port->type == pt) + return port; + return NULL; +} + +static struct notifier_block hsr_nb = { + .notifier_call = hsr_netdev_notify, /* Slave event notifications */ +}; + +static int __init hsr_init(void) +{ + int res; + + BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN); + + register_netdevice_notifier(&hsr_nb); + res = hsr_netlink_init(); + + return res; +} + +static void __exit hsr_exit(void) +{ + hsr_netlink_exit(); + hsr_debugfs_remove_root(); + unregister_netdevice_notifier(&hsr_nb); +} + +module_init(hsr_init); +module_exit(hsr_exit); +MODULE_LICENSE("GPL"); |