From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- net/hsr/hsr_device.c | 566 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 566 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 0000000000..306f942c3b --- /dev/null +++ b/net/hsr/hsr_device.c @@ -0,0 +1,566 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright 2011-2014 Autronica Fire and Security AS + * + * Author(s): + * 2011-2014 Arvid Brodin, arvid.brodin@alten.se + * This file contains device methods for creating, using and destroying + * virtual HSR or PRP 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(&dev_base_lock); + if (dev->operstate != transition) { + dev->operstate = transition; + write_unlock(&dev_base_lock); + netdev_state_change(dev); + } else { + write_unlock(&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; + + ASSERT_RTNL(); + + hsr_for_each_port(master->hsr, port) { + if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) { + netif_carrier_on(master->dev); + return true; + } + } + + netif_carrier_off(master->dev); + + return false; +} + +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; + mod_timer(&hsr->announce_timer, + jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); + } + + 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; + hsr_for_each_port(hsr, port) + if (port->type != HSR_PT_MASTER) + mtu_max = min(port->dev->mtu, mtu_max); + + 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; + + hsr = netdev_priv(dev); + + if (new_mtu > hsr_get_max_mtu(hsr)) { + netdev_info(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'; + + 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); + } + + 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 netdev_tx_t 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); + if (master) { + skb->dev = master->dev; + skb_reset_mac_header(skb); + skb_reset_mac_len(skb); + spin_lock_bh(&hsr->seqnr_lock); + hsr_forward_skb(skb, master); + spin_unlock_bh(&hsr->seqnr_lock); + } else { + dev_core_stats_tx_dropped_inc(dev); + dev_kfree_skb_any(skb); + } + return NETDEV_TX_OK; +} + +static const struct header_ops hsr_header_ops = { + .create = eth_header, + .parse = eth_header_parse, +}; + +static struct sk_buff *hsr_init_skb(struct hsr_port *master) +{ + struct hsr_priv *hsr = master->hsr; + struct sk_buff *skb; + int hlen, tlen; + + hlen = LL_RESERVED_SPACE(master->dev); + tlen = master->dev->needed_tailroom; + /* skb size is same for PRP/HSR frames, only difference + * being, for PRP it is a trailer and for HSR it is a + * header + */ + skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) + + sizeof(struct hsr_sup_payload) + hlen + tlen); + + if (!skb) + return skb; + + skb_reserve(skb, hlen); + skb->dev = master->dev; + skb->priority = TC_PRIO_CONTROL; + + if (dev_hard_header(skb, skb->dev, ETH_P_PRP, + hsr->sup_multicast_addr, + skb->dev->dev_addr, skb->len) <= 0) + goto out; + + skb_reset_mac_header(skb); + skb_reset_mac_len(skb); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + + return skb; +out: + kfree_skb(skb); + + return NULL; +} + +static void send_hsr_supervision_frame(struct hsr_port *master, + unsigned long *interval) +{ + struct hsr_priv *hsr = master->hsr; + __u8 type = HSR_TLV_LIFE_CHECK; + struct hsr_sup_payload *hsr_sp; + struct hsr_sup_tag *hsr_stag; + struct sk_buff *skb; + + *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); + if (hsr->announce_count < 3 && hsr->prot_version == 0) { + type = HSR_TLV_ANNOUNCE; + *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); + hsr->announce_count++; + } + + skb = hsr_init_skb(master); + if (!skb) { + WARN_ONCE(1, "HSR: Could not send supervision frame\n"); + return; + } + + hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); + set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); + set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version); + + /* From HSRv1 on we have separate supervision sequence numbers. */ + spin_lock_bh(&hsr->seqnr_lock); + if (hsr->prot_version > 0) { + hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); + hsr->sup_sequence_nr++; + } else { + hsr_stag->sequence_nr = htons(hsr->sequence_nr); + hsr->sequence_nr++; + } + + hsr_stag->tlv.HSR_TLV_type = type; + /* TODO: Why 12 in HSRv0? */ + hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ? + sizeof(struct hsr_sup_payload) : 12; + + /* Payload: MacAddressA */ + hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); + ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); + + if (skb_put_padto(skb, ETH_ZLEN)) { + spin_unlock_bh(&hsr->seqnr_lock); + return; + } + + hsr_forward_skb(skb, master); + spin_unlock_bh(&hsr->seqnr_lock); + return; +} + +static void send_prp_supervision_frame(struct hsr_port *master, + unsigned long *interval) +{ + struct hsr_priv *hsr = master->hsr; + struct hsr_sup_payload *hsr_sp; + struct hsr_sup_tag *hsr_stag; + struct sk_buff *skb; + + skb = hsr_init_skb(master); + if (!skb) { + WARN_ONCE(1, "PRP: Could not send supervision frame\n"); + return; + } + + *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); + hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); + set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); + set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0)); + + /* From HSRv1 on we have separate supervision sequence numbers. */ + spin_lock_bh(&hsr->seqnr_lock); + hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); + hsr->sup_sequence_nr++; + hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; + hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload); + + /* Payload: MacAddressA */ + hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); + ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); + + if (skb_put_padto(skb, ETH_ZLEN)) { + spin_unlock_bh(&hsr->seqnr_lock); + return; + } + + hsr_forward_skb(skb, master); + spin_unlock_bh(&hsr->seqnr_lock); +} + +/* Announce (supervision frame) timer function + */ +static void hsr_announce(struct timer_list *t) +{ + struct hsr_priv *hsr; + struct hsr_port *master; + unsigned long interval; + + hsr = from_timer(hsr, t, announce_timer); + + rcu_read_lock(); + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + hsr->proto_ops->send_sv_frame(master, &interval); + + if (is_admin_up(master->dev)) + mod_timer(&hsr->announce_timer, jiffies + interval); + + rcu_read_unlock(); +} + +void hsr_del_ports(struct hsr_priv *hsr) +{ + struct hsr_port *port; + + port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); + if (port) + hsr_del_port(port); + + port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); + if (port) + hsr_del_port(port); + + port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + if (port) + hsr_del_port(port); +} + +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", +}; + +static struct hsr_proto_ops hsr_ops = { + .send_sv_frame = send_hsr_supervision_frame, + .create_tagged_frame = hsr_create_tagged_frame, + .get_untagged_frame = hsr_get_untagged_frame, + .drop_frame = hsr_drop_frame, + .fill_frame_info = hsr_fill_frame_info, + .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame, +}; + +static struct hsr_proto_ops prp_ops = { + .send_sv_frame = send_prp_supervision_frame, + .create_tagged_frame = prp_create_tagged_frame, + .get_untagged_frame = prp_get_untagged_frame, + .drop_frame = prp_drop_frame, + .fill_frame_info = prp_fill_frame_info, + .handle_san_frame = prp_handle_san_frame, + .update_san_info = prp_update_san_info, +}; + +void hsr_dev_setup(struct net_device *dev) +{ + eth_hw_addr_random(dev); + + ether_setup(dev); + dev->min_mtu = 0; + dev->header_ops = &hsr_header_ops; + dev->netdev_ops = &hsr_device_ops; + SET_NETDEV_DEVTYPE(dev, &hsr_type); + dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL; + + dev->needs_free_netdev = true; + + 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. + */ +bool is_hsr_master(struct net_device *dev) +{ + return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); +} +EXPORT_SYMBOL(is_hsr_master); + +/* 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, u8 protocol_version, + struct netlink_ext_ack *extack) +{ + bool unregister = false; + struct hsr_priv *hsr; + int res; + + hsr = netdev_priv(hsr_dev); + INIT_LIST_HEAD(&hsr->ports); + INIT_LIST_HEAD(&hsr->node_db); + spin_lock_init(&hsr->list_lock); + + eth_hw_addr_set(hsr_dev, slave[0]->dev_addr); + + /* initialize protocol specific functions */ + if (protocol_version == PRP_V1) { + /* For PRP, lan_id has most significant 3 bits holding + * the net_id of PRP_LAN_ID + */ + hsr->net_id = PRP_LAN_ID << 1; + hsr->proto_ops = &prp_ops; + } else { + hsr->proto_ops = &hsr_ops; + } + + /* Make sure we recognize frames from ourselves in hsr_rcv() */ + res = hsr_create_self_node(hsr, 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; + hsr->sup_sequence_nr = HSR_SUP_SEQNR_START; + + timer_setup(&hsr->announce_timer, hsr_announce, 0); + timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); + + ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); + hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; + + hsr->prot_version = protocol_version; + + /* 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, extack); + if (res) + goto err_add_master; + + /* HSR forwarding offload supported in lower device? */ + if ((slave[0]->features & NETIF_F_HW_HSR_FWD) && + (slave[1]->features & NETIF_F_HW_HSR_FWD)) + hsr->fwd_offloaded = true; + + res = register_netdevice(hsr_dev); + if (res) + goto err_unregister; + + unregister = true; + + res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack); + if (res) + goto err_unregister; + + res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack); + if (res) + goto err_unregister; + + hsr_debugfs_init(hsr, hsr_dev); + mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD)); + + return 0; + +err_unregister: + hsr_del_ports(hsr); +err_add_master: + hsr_del_self_node(hsr); + + if (unregister) + unregister_netdevice(hsr_dev); + return res; +} -- cgit v1.2.3