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562 lines
14 KiB
562 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright 2011-2014 Autronica Fire and Security AS |
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* |
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* Author(s): |
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* 2011-2014 Arvid Brodin, [email protected] |
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* This file contains device methods for creating, using and destroying |
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* virtual HSR or PRP devices. |
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*/ |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/etherdevice.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/pkt_sched.h> |
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#include "hsr_device.h" |
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#include "hsr_slave.h" |
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#include "hsr_framereg.h" |
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#include "hsr_main.h" |
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#include "hsr_forward.h" |
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static bool is_admin_up(struct net_device *dev) |
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{ |
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return dev && (dev->flags & IFF_UP); |
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} |
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static bool is_slave_up(struct net_device *dev) |
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{ |
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return dev && is_admin_up(dev) && netif_oper_up(dev); |
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} |
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static void __hsr_set_operstate(struct net_device *dev, int transition) |
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{ |
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write_lock_bh(&dev_base_lock); |
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if (dev->operstate != transition) { |
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dev->operstate = transition; |
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write_unlock_bh(&dev_base_lock); |
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netdev_state_change(dev); |
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} else { |
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write_unlock_bh(&dev_base_lock); |
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} |
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} |
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static void hsr_set_operstate(struct hsr_port *master, bool has_carrier) |
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{ |
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if (!is_admin_up(master->dev)) { |
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__hsr_set_operstate(master->dev, IF_OPER_DOWN); |
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return; |
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} |
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if (has_carrier) |
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__hsr_set_operstate(master->dev, IF_OPER_UP); |
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else |
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__hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN); |
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} |
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static bool hsr_check_carrier(struct hsr_port *master) |
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{ |
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struct hsr_port *port; |
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ASSERT_RTNL(); |
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hsr_for_each_port(master->hsr, port) { |
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if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) { |
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netif_carrier_on(master->dev); |
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return true; |
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} |
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} |
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netif_carrier_off(master->dev); |
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return false; |
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} |
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static void hsr_check_announce(struct net_device *hsr_dev, |
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unsigned char old_operstate) |
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{ |
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struct hsr_priv *hsr; |
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hsr = netdev_priv(hsr_dev); |
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if (hsr_dev->operstate == IF_OPER_UP && old_operstate != IF_OPER_UP) { |
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/* Went up */ |
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hsr->announce_count = 0; |
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mod_timer(&hsr->announce_timer, |
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jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); |
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} |
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if (hsr_dev->operstate != IF_OPER_UP && old_operstate == IF_OPER_UP) |
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/* Went down */ |
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del_timer(&hsr->announce_timer); |
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} |
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void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) |
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{ |
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struct hsr_port *master; |
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unsigned char old_operstate; |
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bool has_carrier; |
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
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/* netif_stacked_transfer_operstate() cannot be used here since |
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* it doesn't set IF_OPER_LOWERLAYERDOWN (?) |
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*/ |
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old_operstate = master->dev->operstate; |
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has_carrier = hsr_check_carrier(master); |
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hsr_set_operstate(master, has_carrier); |
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hsr_check_announce(master->dev, old_operstate); |
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} |
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int hsr_get_max_mtu(struct hsr_priv *hsr) |
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{ |
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unsigned int mtu_max; |
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struct hsr_port *port; |
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mtu_max = ETH_DATA_LEN; |
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hsr_for_each_port(hsr, port) |
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if (port->type != HSR_PT_MASTER) |
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mtu_max = min(port->dev->mtu, mtu_max); |
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if (mtu_max < HSR_HLEN) |
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return 0; |
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return mtu_max - HSR_HLEN; |
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} |
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static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) |
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{ |
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struct hsr_priv *hsr; |
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hsr = netdev_priv(dev); |
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if (new_mtu > hsr_get_max_mtu(hsr)) { |
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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", |
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HSR_HLEN); |
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return -EINVAL; |
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} |
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dev->mtu = new_mtu; |
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return 0; |
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} |
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static int hsr_dev_open(struct net_device *dev) |
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{ |
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struct hsr_priv *hsr; |
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struct hsr_port *port; |
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char designation; |
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hsr = netdev_priv(dev); |
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designation = '\0'; |
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hsr_for_each_port(hsr, port) { |
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if (port->type == HSR_PT_MASTER) |
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continue; |
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switch (port->type) { |
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case HSR_PT_SLAVE_A: |
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designation = 'A'; |
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break; |
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case HSR_PT_SLAVE_B: |
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designation = 'B'; |
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break; |
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default: |
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designation = '?'; |
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} |
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if (!is_slave_up(port->dev)) |
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netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n", |
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designation, port->dev->name); |
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} |
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if (designation == '\0') |
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netdev_warn(dev, "No slave devices configured\n"); |
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return 0; |
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} |
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static int hsr_dev_close(struct net_device *dev) |
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{ |
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/* Nothing to do here. */ |
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return 0; |
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} |
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static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, |
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netdev_features_t features) |
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{ |
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netdev_features_t mask; |
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struct hsr_port *port; |
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mask = features; |
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/* Mask out all features that, if supported by one device, should be |
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* enabled for all devices (see NETIF_F_ONE_FOR_ALL). |
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* |
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* Anything that's off in mask will not be enabled - so only things |
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* that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, |
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* may become enabled. |
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*/ |
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features &= ~NETIF_F_ONE_FOR_ALL; |
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hsr_for_each_port(hsr, port) |
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features = netdev_increment_features(features, |
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port->dev->features, |
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mask); |
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return features; |
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} |
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static netdev_features_t hsr_fix_features(struct net_device *dev, |
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netdev_features_t features) |
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{ |
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struct hsr_priv *hsr = netdev_priv(dev); |
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return hsr_features_recompute(hsr, features); |
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} |
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static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct hsr_priv *hsr = netdev_priv(dev); |
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struct hsr_port *master; |
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
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if (master) { |
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skb->dev = master->dev; |
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skb_reset_mac_header(skb); |
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skb_reset_mac_len(skb); |
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hsr_forward_skb(skb, master); |
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} else { |
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atomic_long_inc(&dev->tx_dropped); |
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dev_kfree_skb_any(skb); |
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} |
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return NETDEV_TX_OK; |
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} |
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static const struct header_ops hsr_header_ops = { |
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.create = eth_header, |
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.parse = eth_header_parse, |
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}; |
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static struct sk_buff *hsr_init_skb(struct hsr_port *master) |
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{ |
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struct hsr_priv *hsr = master->hsr; |
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struct sk_buff *skb; |
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int hlen, tlen; |
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hlen = LL_RESERVED_SPACE(master->dev); |
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tlen = master->dev->needed_tailroom; |
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/* skb size is same for PRP/HSR frames, only difference |
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* being, for PRP it is a trailer and for HSR it is a |
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* header |
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*/ |
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skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) + |
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sizeof(struct hsr_sup_payload) + hlen + tlen); |
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if (!skb) |
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return skb; |
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skb_reserve(skb, hlen); |
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skb->dev = master->dev; |
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skb->priority = TC_PRIO_CONTROL; |
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if (dev_hard_header(skb, skb->dev, ETH_P_PRP, |
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hsr->sup_multicast_addr, |
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skb->dev->dev_addr, skb->len) <= 0) |
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goto out; |
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skb_reset_mac_header(skb); |
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skb_reset_mac_len(skb); |
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skb_reset_network_header(skb); |
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skb_reset_transport_header(skb); |
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return skb; |
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out: |
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kfree_skb(skb); |
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return NULL; |
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} |
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static void send_hsr_supervision_frame(struct hsr_port *master, |
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unsigned long *interval) |
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{ |
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struct hsr_priv *hsr = master->hsr; |
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__u8 type = HSR_TLV_LIFE_CHECK; |
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struct hsr_sup_payload *hsr_sp; |
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struct hsr_sup_tag *hsr_stag; |
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unsigned long irqflags; |
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struct sk_buff *skb; |
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*interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); |
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if (hsr->announce_count < 3 && hsr->prot_version == 0) { |
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type = HSR_TLV_ANNOUNCE; |
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*interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); |
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hsr->announce_count++; |
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} |
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skb = hsr_init_skb(master); |
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if (!skb) { |
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WARN_ONCE(1, "HSR: Could not send supervision frame\n"); |
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return; |
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} |
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hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); |
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set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); |
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set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version); |
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/* From HSRv1 on we have separate supervision sequence numbers. */ |
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spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); |
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if (hsr->prot_version > 0) { |
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hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); |
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hsr->sup_sequence_nr++; |
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} else { |
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hsr_stag->sequence_nr = htons(hsr->sequence_nr); |
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hsr->sequence_nr++; |
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} |
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spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); |
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hsr_stag->HSR_TLV_type = type; |
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/* TODO: Why 12 in HSRv0? */ |
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hsr_stag->HSR_TLV_length = hsr->prot_version ? |
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sizeof(struct hsr_sup_payload) : 12; |
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/* Payload: MacAddressA */ |
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hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); |
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ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); |
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if (skb_put_padto(skb, ETH_ZLEN)) |
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return; |
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hsr_forward_skb(skb, master); |
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return; |
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} |
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static void send_prp_supervision_frame(struct hsr_port *master, |
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unsigned long *interval) |
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{ |
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struct hsr_priv *hsr = master->hsr; |
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struct hsr_sup_payload *hsr_sp; |
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struct hsr_sup_tag *hsr_stag; |
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unsigned long irqflags; |
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struct sk_buff *skb; |
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skb = hsr_init_skb(master); |
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if (!skb) { |
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WARN_ONCE(1, "PRP: Could not send supervision frame\n"); |
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return; |
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} |
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*interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); |
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hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); |
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set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); |
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set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0)); |
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/* From HSRv1 on we have separate supervision sequence numbers. */ |
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spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); |
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hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); |
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hsr->sup_sequence_nr++; |
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hsr_stag->HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; |
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hsr_stag->HSR_TLV_length = sizeof(struct hsr_sup_payload); |
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/* Payload: MacAddressA */ |
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hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); |
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ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); |
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if (skb_put_padto(skb, ETH_ZLEN)) { |
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spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); |
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return; |
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} |
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spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); |
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hsr_forward_skb(skb, master); |
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} |
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/* Announce (supervision frame) timer function |
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*/ |
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static void hsr_announce(struct timer_list *t) |
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{ |
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struct hsr_priv *hsr; |
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struct hsr_port *master; |
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unsigned long interval; |
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hsr = from_timer(hsr, t, announce_timer); |
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rcu_read_lock(); |
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
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hsr->proto_ops->send_sv_frame(master, &interval); |
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if (is_admin_up(master->dev)) |
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mod_timer(&hsr->announce_timer, jiffies + interval); |
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rcu_read_unlock(); |
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} |
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void hsr_del_ports(struct hsr_priv *hsr) |
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{ |
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struct hsr_port *port; |
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); |
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if (port) |
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hsr_del_port(port); |
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); |
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if (port) |
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hsr_del_port(port); |
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port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); |
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if (port) |
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hsr_del_port(port); |
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} |
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static const struct net_device_ops hsr_device_ops = { |
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.ndo_change_mtu = hsr_dev_change_mtu, |
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.ndo_open = hsr_dev_open, |
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.ndo_stop = hsr_dev_close, |
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.ndo_start_xmit = hsr_dev_xmit, |
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.ndo_fix_features = hsr_fix_features, |
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}; |
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static struct device_type hsr_type = { |
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.name = "hsr", |
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}; |
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static struct hsr_proto_ops hsr_ops = { |
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.send_sv_frame = send_hsr_supervision_frame, |
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.create_tagged_frame = hsr_create_tagged_frame, |
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.get_untagged_frame = hsr_get_untagged_frame, |
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.drop_frame = hsr_drop_frame, |
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.fill_frame_info = hsr_fill_frame_info, |
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.invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame, |
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}; |
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static struct hsr_proto_ops prp_ops = { |
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.send_sv_frame = send_prp_supervision_frame, |
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.create_tagged_frame = prp_create_tagged_frame, |
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.get_untagged_frame = prp_get_untagged_frame, |
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.drop_frame = prp_drop_frame, |
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.fill_frame_info = prp_fill_frame_info, |
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.handle_san_frame = prp_handle_san_frame, |
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.update_san_info = prp_update_san_info, |
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}; |
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void hsr_dev_setup(struct net_device *dev) |
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{ |
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eth_hw_addr_random(dev); |
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ether_setup(dev); |
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dev->min_mtu = 0; |
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dev->header_ops = &hsr_header_ops; |
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dev->netdev_ops = &hsr_device_ops; |
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SET_NETDEV_DEVTYPE(dev, &hsr_type); |
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dev->priv_flags |= IFF_NO_QUEUE; |
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dev->needs_free_netdev = true; |
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dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | |
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NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | |
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NETIF_F_HW_VLAN_CTAG_TX; |
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dev->features = dev->hw_features; |
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/* Prevent recursive tx locking */ |
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dev->features |= NETIF_F_LLTX; |
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/* VLAN on top of HSR needs testing and probably some work on |
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* hsr_header_create() etc. |
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*/ |
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dev->features |= NETIF_F_VLAN_CHALLENGED; |
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/* Not sure about this. Taken from bridge code. netdev_features.h says |
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* it means "Does not change network namespaces". |
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*/ |
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dev->features |= NETIF_F_NETNS_LOCAL; |
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} |
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|
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/* Return true if dev is a HSR master; return false otherwise. |
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*/ |
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bool is_hsr_master(struct net_device *dev) |
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{ |
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return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); |
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} |
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EXPORT_SYMBOL(is_hsr_master); |
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|
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/* Default multicast address for HSR Supervision frames */ |
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static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { |
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0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 |
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}; |
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int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], |
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unsigned char multicast_spec, u8 protocol_version, |
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struct netlink_ext_ack *extack) |
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{ |
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bool unregister = false; |
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struct hsr_priv *hsr; |
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int res; |
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hsr = netdev_priv(hsr_dev); |
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INIT_LIST_HEAD(&hsr->ports); |
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INIT_LIST_HEAD(&hsr->node_db); |
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INIT_LIST_HEAD(&hsr->self_node_db); |
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spin_lock_init(&hsr->list_lock); |
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ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr); |
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|
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/* initialize protocol specific functions */ |
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if (protocol_version == PRP_V1) { |
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/* For PRP, lan_id has most significant 3 bits holding |
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* the net_id of PRP_LAN_ID |
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*/ |
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hsr->net_id = PRP_LAN_ID << 1; |
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hsr->proto_ops = &prp_ops; |
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} else { |
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hsr->proto_ops = &hsr_ops; |
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} |
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|
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/* Make sure we recognize frames from ourselves in hsr_rcv() */ |
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res = hsr_create_self_node(hsr, hsr_dev->dev_addr, |
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slave[1]->dev_addr); |
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if (res < 0) |
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return res; |
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spin_lock_init(&hsr->seqnr_lock); |
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/* Overflow soon to find bugs easier: */ |
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hsr->sequence_nr = HSR_SEQNR_START; |
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hsr->sup_sequence_nr = HSR_SUP_SEQNR_START; |
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|
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timer_setup(&hsr->announce_timer, hsr_announce, 0); |
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timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); |
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ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); |
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hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; |
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|
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hsr->prot_version = protocol_version; |
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|
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/* Make sure the 1st call to netif_carrier_on() gets through */ |
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netif_carrier_off(hsr_dev); |
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|
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res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack); |
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if (res) |
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goto err_add_master; |
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|
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res = register_netdevice(hsr_dev); |
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if (res) |
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goto err_unregister; |
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|
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unregister = true; |
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res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack); |
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if (res) |
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goto err_unregister; |
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|
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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; |
|
}
|
|
|