From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- net/hsr/hsr_device.c | 503 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 503 insertions(+) create mode 100644 net/hsr/hsr_device.c (limited to 'net/hsr/hsr_device.c') diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c new file mode 100644 index 000000000..44d27469a --- /dev/null +++ b/net/hsr/hsr_device.c @@ -0,0 +1,503 @@ +/* Copyright 2011-2014 Autronica Fire and Security AS + * + * 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. + * + * Author(s): + * 2011-2014 Arvid Brodin, arvid.brodin@alten.se + * + * This file contains device methods for creating, using and destroying + * virtual HSR devices. + */ + +#include +#include +#include +#include +#include +#include "hsr_device.h" +#include "hsr_slave.h" +#include "hsr_framereg.h" +#include "hsr_main.h" +#include "hsr_forward.h" + + +static bool is_admin_up(struct net_device *dev) +{ + return dev && (dev->flags & IFF_UP); +} + +static bool is_slave_up(struct net_device *dev) +{ + return dev && is_admin_up(dev) && netif_oper_up(dev); +} + +static void __hsr_set_operstate(struct net_device *dev, int transition) +{ + write_lock_bh(&dev_base_lock); + if (dev->operstate != transition) { + dev->operstate = transition; + write_unlock_bh(&dev_base_lock); + netdev_state_change(dev); + } else { + write_unlock_bh(&dev_base_lock); + } +} + +static void hsr_set_operstate(struct hsr_port *master, bool has_carrier) +{ + if (!is_admin_up(master->dev)) { + __hsr_set_operstate(master->dev, IF_OPER_DOWN); + return; + } + + if (has_carrier) + __hsr_set_operstate(master->dev, IF_OPER_UP); + else + __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN); +} + +static bool hsr_check_carrier(struct hsr_port *master) +{ + struct hsr_port *port; + bool has_carrier; + + has_carrier = false; + + rcu_read_lock(); + hsr_for_each_port(master->hsr, port) + if ((port->type != HSR_PT_MASTER) && is_slave_up(port->dev)) { + has_carrier = true; + break; + } + rcu_read_unlock(); + + if (has_carrier) + netif_carrier_on(master->dev); + else + netif_carrier_off(master->dev); + + return has_carrier; +} + + +static void hsr_check_announce(struct net_device *hsr_dev, + unsigned char old_operstate) +{ + struct hsr_priv *hsr; + + hsr = netdev_priv(hsr_dev); + + if ((hsr_dev->operstate == IF_OPER_UP) && (old_operstate != IF_OPER_UP)) { + /* Went up */ + hsr->announce_count = 0; + hsr->announce_timer.expires = jiffies + + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); + add_timer(&hsr->announce_timer); + } + + if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP)) + /* Went down */ + del_timer(&hsr->announce_timer); +} + +void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) +{ + struct hsr_port *master; + unsigned char old_operstate; + bool has_carrier; + + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + /* netif_stacked_transfer_operstate() cannot be used here since + * it doesn't set IF_OPER_LOWERLAYERDOWN (?) + */ + old_operstate = master->dev->operstate; + has_carrier = hsr_check_carrier(master); + hsr_set_operstate(master, has_carrier); + hsr_check_announce(master->dev, old_operstate); +} + +int hsr_get_max_mtu(struct hsr_priv *hsr) +{ + unsigned int mtu_max; + struct hsr_port *port; + + mtu_max = ETH_DATA_LEN; + rcu_read_lock(); + hsr_for_each_port(hsr, port) + if (port->type != HSR_PT_MASTER) + mtu_max = min(port->dev->mtu, mtu_max); + rcu_read_unlock(); + + if (mtu_max < HSR_HLEN) + return 0; + return mtu_max - HSR_HLEN; +} + + +static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) +{ + struct hsr_priv *hsr; + struct hsr_port *master; + + hsr = netdev_priv(dev); + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + + if (new_mtu > hsr_get_max_mtu(hsr)) { + netdev_info(master->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n", + HSR_HLEN); + return -EINVAL; + } + + dev->mtu = new_mtu; + + return 0; +} + +static int hsr_dev_open(struct net_device *dev) +{ + struct hsr_priv *hsr; + struct hsr_port *port; + char designation; + + hsr = netdev_priv(dev); + designation = '\0'; + + rcu_read_lock(); + hsr_for_each_port(hsr, port) { + if (port->type == HSR_PT_MASTER) + continue; + switch (port->type) { + case HSR_PT_SLAVE_A: + designation = 'A'; + break; + case HSR_PT_SLAVE_B: + designation = 'B'; + break; + default: + designation = '?'; + } + if (!is_slave_up(port->dev)) + netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n", + designation, port->dev->name); + } + rcu_read_unlock(); + + if (designation == '\0') + netdev_warn(dev, "No slave devices configured\n"); + + return 0; +} + + +static int hsr_dev_close(struct net_device *dev) +{ + /* Nothing to do here. */ + return 0; +} + + +static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, + netdev_features_t features) +{ + netdev_features_t mask; + struct hsr_port *port; + + mask = features; + + /* Mask out all features that, if supported by one device, should be + * enabled for all devices (see NETIF_F_ONE_FOR_ALL). + * + * Anything that's off in mask will not be enabled - so only things + * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, + * may become enabled. + */ + features &= ~NETIF_F_ONE_FOR_ALL; + hsr_for_each_port(hsr, port) + features = netdev_increment_features(features, + port->dev->features, + mask); + + return features; +} + +static netdev_features_t hsr_fix_features(struct net_device *dev, + netdev_features_t features) +{ + struct hsr_priv *hsr = netdev_priv(dev); + + return hsr_features_recompute(hsr, features); +} + + +static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct hsr_priv *hsr = netdev_priv(dev); + struct hsr_port *master; + + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + skb->dev = master->dev; + hsr_forward_skb(skb, master); + + return NETDEV_TX_OK; +} + + +static const struct header_ops hsr_header_ops = { + .create = eth_header, + .parse = eth_header_parse, +}; + + +/* HSR:2010 supervision frames should be padded so that the whole frame, + * including headers and FCS, is 64 bytes (without VLAN). + */ +static int hsr_pad(int size) +{ + const int min_size = ETH_ZLEN - HSR_HLEN - ETH_HLEN; + + if (size >= min_size) + return size; + return min_size; +} + +static void send_hsr_supervision_frame(struct hsr_port *master, u8 type) +{ + struct sk_buff *skb; + int hlen, tlen; + struct hsr_sup_tag *hsr_stag; + struct hsr_sup_payload *hsr_sp; + unsigned long irqflags; + + hlen = LL_RESERVED_SPACE(master->dev); + tlen = master->dev->needed_tailroom; + skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen, + GFP_ATOMIC); + + if (skb == NULL) + return; + + skb_reserve(skb, hlen); + + skb->dev = master->dev; + skb->protocol = htons(ETH_P_PRP); + skb->priority = TC_PRIO_CONTROL; + + if (dev_hard_header(skb, skb->dev, ETH_P_PRP, + master->hsr->sup_multicast_addr, + skb->dev->dev_addr, skb->len) <= 0) + goto out; + skb_reset_mac_header(skb); + + hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(*hsr_stag)); + + set_hsr_stag_path(hsr_stag, 0xf); + set_hsr_stag_HSR_Ver(hsr_stag, 0); + + spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); + hsr_stag->sequence_nr = htons(master->hsr->sequence_nr); + master->hsr->sequence_nr++; + spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); + + hsr_stag->HSR_TLV_Type = type; + hsr_stag->HSR_TLV_Length = 12; + + /* Payload: MacAddressA */ + hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp)); + ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr); + + hsr_forward_skb(skb, master); + return; + +out: + WARN_ON_ONCE("HSR: Could not send supervision frame\n"); + kfree_skb(skb); +} + + +/* Announce (supervision frame) timer function + */ +static void hsr_announce(unsigned long data) +{ + struct hsr_priv *hsr; + struct hsr_port *master; + + hsr = (struct hsr_priv *) data; + + rcu_read_lock(); + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + + if (hsr->announce_count < 3) { + send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE); + hsr->announce_count++; + } else { + send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK); + } + + if (hsr->announce_count < 3) + hsr->announce_timer.expires = jiffies + + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); + else + hsr->announce_timer.expires = jiffies + + msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); + + if (is_admin_up(master->dev)) + add_timer(&hsr->announce_timer); + + rcu_read_unlock(); +} + + +/* According to comments in the declaration of struct net_device, this function + * is "Called from unregister, can be used to call free_netdev". Ok then... + */ +static void hsr_dev_destroy(struct net_device *hsr_dev) +{ + struct hsr_priv *hsr; + struct hsr_port *port; + + hsr = netdev_priv(hsr_dev); + + rtnl_lock(); + hsr_for_each_port(hsr, port) + hsr_del_port(port); + rtnl_unlock(); + + del_timer_sync(&hsr->prune_timer); + del_timer_sync(&hsr->announce_timer); + + synchronize_rcu(); + free_netdev(hsr_dev); +} + +static const struct net_device_ops hsr_device_ops = { + .ndo_change_mtu = hsr_dev_change_mtu, + .ndo_open = hsr_dev_open, + .ndo_stop = hsr_dev_close, + .ndo_start_xmit = hsr_dev_xmit, + .ndo_fix_features = hsr_fix_features, +}; + +static struct device_type hsr_type = { + .name = "hsr", +}; + +void hsr_dev_setup(struct net_device *dev) +{ + random_ether_addr(dev->dev_addr); + + ether_setup(dev); + dev->header_ops = &hsr_header_ops; + dev->netdev_ops = &hsr_device_ops; + SET_NETDEV_DEVTYPE(dev, &hsr_type); + dev->tx_queue_len = 0; + + dev->destructor = hsr_dev_destroy; + + dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | + NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | + NETIF_F_HW_VLAN_CTAG_TX; + + dev->features = dev->hw_features; + + /* Prevent recursive tx locking */ + dev->features |= NETIF_F_LLTX; + /* VLAN on top of HSR needs testing and probably some work on + * hsr_header_create() etc. + */ + dev->features |= NETIF_F_VLAN_CHALLENGED; + /* Not sure about this. Taken from bridge code. netdev_features.h says + * it means "Does not change network namespaces". + */ + dev->features |= NETIF_F_NETNS_LOCAL; +} + + +/* Return true if dev is a HSR master; return false otherwise. + */ +inline bool is_hsr_master(struct net_device *dev) +{ + return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); +} + +/* Default multicast address for HSR Supervision frames */ +static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { + 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 +}; + +int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], + unsigned char multicast_spec) +{ + struct hsr_priv *hsr; + struct hsr_port *port; + int res; + + hsr = netdev_priv(hsr_dev); + INIT_LIST_HEAD(&hsr->ports); + INIT_LIST_HEAD(&hsr->node_db); + INIT_LIST_HEAD(&hsr->self_node_db); + + ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr); + + /* Make sure we recognize frames from ourselves in hsr_rcv() */ + res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr, + slave[1]->dev_addr); + if (res < 0) + return res; + + spin_lock_init(&hsr->seqnr_lock); + /* Overflow soon to find bugs easier: */ + hsr->sequence_nr = HSR_SEQNR_START; + + init_timer(&hsr->announce_timer); + hsr->announce_timer.function = hsr_announce; + hsr->announce_timer.data = (unsigned long) hsr; + + init_timer(&hsr->prune_timer); + hsr->prune_timer.function = hsr_prune_nodes; + hsr->prune_timer.data = (unsigned long) hsr; + + ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); + hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; + + /* FIXME: should I modify the value of these? + * + * - hsr_dev->flags - i.e. + * IFF_MASTER/SLAVE? + * - hsr_dev->priv_flags - i.e. + * IFF_EBRIDGE? + * IFF_TX_SKB_SHARING? + * IFF_HSR_MASTER/SLAVE? + */ + + /* Make sure the 1st call to netif_carrier_on() gets through */ + netif_carrier_off(hsr_dev); + + res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER); + if (res) + return res; + + res = register_netdevice(hsr_dev); + if (res) + goto fail; + + res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A); + if (res) + goto fail; + res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B); + if (res) + goto fail; + + hsr->prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD); + add_timer(&hsr->prune_timer); + + return 0; + +fail: + hsr_for_each_port(hsr, port) + hsr_del_port(port); + + return res; +} -- cgit v1.2.3-54-g00ecf