v4.19.13 snapshot.
diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
new file mode 100644
index 0000000..b8cd43c
--- /dev/null
+++ b/net/hsr/hsr_device.c
@@ -0,0 +1,511 @@
+/* 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 <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/pkt_sched.h>
+#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,
+};
+
+static void send_hsr_supervision_frame(struct hsr_port *master,
+ u8 type, u8 hsrVer)
+{
+ struct sk_buff *skb;
+ int hlen, tlen;
+ struct hsr_tag *hsr_tag;
+ 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 = dev_alloc_skb(
+ sizeof(struct hsr_tag) +
+ sizeof(struct hsr_sup_tag) +
+ sizeof(struct hsr_sup_payload) + hlen + tlen);
+
+ if (skb == NULL)
+ return;
+
+ skb_reserve(skb, hlen);
+
+ skb->dev = master->dev;
+ skb->protocol = htons(hsrVer ? ETH_P_HSR : ETH_P_PRP);
+ skb->priority = TC_PRIO_CONTROL;
+
+ if (dev_hard_header(skb, skb->dev, (hsrVer ? ETH_P_HSR : ETH_P_PRP),
+ master->hsr->sup_multicast_addr,
+ skb->dev->dev_addr, skb->len) <= 0)
+ goto out;
+ skb_reset_mac_header(skb);
+
+ if (hsrVer > 0) {
+ hsr_tag = skb_put(skb, sizeof(struct hsr_tag));
+ hsr_tag->encap_proto = htons(ETH_P_PRP);
+ set_hsr_tag_LSDU_size(hsr_tag, HSR_V1_SUP_LSDUSIZE);
+ }
+
+ hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
+ set_hsr_stag_path(hsr_stag, (hsrVer ? 0x0 : 0xf));
+ set_hsr_stag_HSR_Ver(hsr_stag, hsrVer);
+
+ /* From HSRv1 on we have separate supervision sequence numbers. */
+ spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
+ if (hsrVer > 0) {
+ hsr_stag->sequence_nr = htons(master->hsr->sup_sequence_nr);
+ hsr_tag->sequence_nr = htons(master->hsr->sequence_nr);
+ master->hsr->sup_sequence_nr++;
+ master->hsr->sequence_nr++;
+ } else {
+ 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;
+ /* TODO: Why 12 in HSRv0? */
+ hsr_stag->HSR_TLV_Length = hsrVer ? sizeof(struct hsr_sup_payload) : 12;
+
+ /* Payload: MacAddressA */
+ hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
+ ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
+
+ if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
+ return;
+
+ hsr_forward_skb(skb, master);
+ return;
+
+out:
+ WARN_ONCE(1, "HSR: Could not send supervision frame\n");
+ kfree_skb(skb);
+}
+
+
+/* Announce (supervision frame) timer function
+ */
+static void hsr_announce(struct timer_list *t)
+{
+ struct hsr_priv *hsr;
+ struct hsr_port *master;
+
+ hsr = from_timer(hsr, t, announce_timer);
+
+ rcu_read_lock();
+ master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+
+ if (hsr->announce_count < 3 && hsr->protVersion == 0) {
+ send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE,
+ hsr->protVersion);
+ hsr->announce_count++;
+
+ hsr->announce_timer.expires = jiffies +
+ msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
+ } else {
+ send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK,
+ hsr->protVersion);
+
+ 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();
+}
+
+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)
+{
+ 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;
+
+ dev->needs_free_netdev = true;
+ dev->priv_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, u8 protocol_version)
+{
+ 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;
+ 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->protVersion = protocol_version;
+
+ /* 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;
+
+ mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
+
+ return 0;
+
+fail:
+ hsr_for_each_port(hsr, port)
+ hsr_del_port(port);
+
+ return res;
+}