5113f6f70
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kernel add
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/* 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_prp_device.h"
#include "hsr_prp_slave.h"
#include "hsr_prp_framereg.h"
#include "hsr_prp_main.h"
#include "hsr_prp_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 __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 set_operstate(struct hsr_prp_port *master, bool has_carrier)
{
if (!is_admin_up(master->dev)) {
__set_operstate(master->dev, IF_OPER_DOWN);
return;
}
if (has_carrier)
__set_operstate(master->dev, IF_OPER_UP);
else
__set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN);
}
static bool hsr_prp_check_carrier(struct hsr_prp_port *master)
{
struct hsr_prp_port *port;
bool has_carrier;
has_carrier = false;
rcu_read_lock();
hsr_prp_for_each_port(master->priv, port)
if ((port->type != HSR_PRP_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_prp_check_announce(struct net_device *hsr_dev,
unsigned char old_operstate)
{
struct hsr_prp_priv *priv;
priv = netdev_priv(hsr_dev);
if ((hsr_dev->operstate == IF_OPER_UP) &&
(old_operstate != IF_OPER_UP)) {
/* Went up */
priv->announce_count = 0;
priv->announce_timer.expires = jiffies +
msecs_to_jiffies(HSR_PRP_ANNOUNCE_INTERVAL);
add_timer(&priv->announce_timer);
}
if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP))
/* Went down */
del_timer(&priv->announce_timer);
}
void hsr_prp_check_carrier_and_operstate(struct hsr_prp_priv *priv)
{
struct hsr_prp_port *master;
unsigned char old_operstate;
bool has_carrier;
master = hsr_prp_get_port(priv, HSR_PRP_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_prp_check_carrier(master);
set_operstate(master, has_carrier);
hsr_prp_check_announce(master->dev, old_operstate);
}
int hsr_prp_get_max_mtu(struct hsr_prp_priv *priv)
{
unsigned int mtu_max;
struct hsr_prp_port *port;
mtu_max = ETH_DATA_LEN;
rcu_read_lock();
hsr_prp_for_each_port(priv, port)
if (port->type != HSR_PRP_PT_MASTER)
mtu_max = min(port->dev->mtu, mtu_max);
rcu_read_unlock();
if (mtu_max < HSR_PRP_HLEN)
return 0;
return mtu_max - HSR_PRP_HLEN;
}
static int hsr_prp_dev_change_mtu(struct net_device *dev, int new_mtu)
{
struct hsr_prp_priv *priv;
struct hsr_prp_port *master;
priv = netdev_priv(dev);
master = hsr_prp_get_port(priv, HSR_PRP_PT_MASTER);
if (new_mtu > hsr_prp_get_max_mtu(priv)) {
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).
",
HSR_PRP_HLEN);
return -EINVAL;
}
dev->mtu = new_mtu;
return 0;
}
static int hsr_prp_dev_open(struct net_device *dev)
{
struct hsr_prp_priv *priv;
struct hsr_prp_port *port;
char designation;
priv = netdev_priv(dev);
designation = '\0';
rcu_read_lock();
hsr_prp_for_each_port(priv, port) {
if (port->type == HSR_PRP_PT_MASTER)
continue;
switch (port->type) {
case HSR_PRP_PT_SLAVE_A:
designation = 'A';
break;
case HSR_PRP_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
",
designation, port->dev->name);
}
rcu_read_unlock();
if (designation == '\0')
netdev_warn(dev, "No slave devices configured
");
return 0;
}
static int hsr_prp_dev_close(struct net_device *dev)
{
/* Nothing to do here. */
return 0;
}
static netdev_features_t hsr_prp_features_recompute(struct hsr_prp_priv *priv,
netdev_features_t features)
{
netdev_features_t mask;
struct hsr_prp_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_prp_for_each_port(priv, port)
features = netdev_increment_features(features,
port->dev->features,
mask);
return features;
}
static netdev_features_t hsr_prp_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct hsr_prp_priv *priv = netdev_priv(dev);
return hsr_prp_features_recompute(priv, features);
}
static int hsr_prp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct hsr_prp_priv *priv = netdev_priv(dev);
struct hsr_prp_port *master;
master = hsr_prp_get_port(priv, HSR_PRP_PT_MASTER);
skb->dev = master->dev;
hsr_prp_forward_skb(skb, master);
master->dev->stats.tx_packets++;
master->dev->stats.tx_bytes += skb->len;
return NETDEV_TX_OK;
}
static const struct header_ops hsr_prp_header_ops = {
.create = eth_header,
.parse = eth_header_parse,
};
static void send_supervision_frame(struct hsr_prp_port *master,
u8 type, u8 prot_ver)
{
struct sk_buff *skb;
int hlen, tlen;
struct hsr_tag *hsr_tag;
struct prp_rct *rct;
struct hsr_prp_sup_tag *hsr_stag;
struct hsr_prp_sup_payload *hsr_sp;
unsigned long irqflags;
u16 proto;
u8 *tail;
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 trailor and for HSR it is a
* header
*/
skb = dev_alloc_skb(
sizeof(struct hsr_tag) +
sizeof(struct hsr_prp_sup_tag) +
sizeof(struct hsr_prp_sup_payload) + hlen + tlen);
if (!skb)
return;
skb_reserve(skb, hlen);
if (!prot_ver)
proto = ETH_P_PRP;
else
proto = (prot_ver == HSR_V1) ? ETH_P_HSR : ETH_P_PRP;
skb->dev = master->dev;
skb->protocol = htons(proto);
skb->priority = TC_PRIO_CONTROL;
if (dev_hard_header(skb, skb->dev, proto,
master->priv->sup_multicast_addr,
skb->dev->dev_addr, skb->len) <= 0)
goto out;
skb_reset_mac_header(skb);
if (prot_ver == HSR_V1) {
hsr_tag = (typeof(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_PRP_V1_SUP_LSDUSIZE);
}
hsr_stag = (typeof(hsr_stag))skb_put(skb,
sizeof(struct hsr_prp_sup_tag));
set_hsr_stag_path(hsr_stag, (prot_ver ? 0x0 : 0xf));
set_hsr_stag_HSR_ver(hsr_stag, prot_ver ? 0x1 : 0x0);
/* From HSRv1 on we have separate supervision sequence numbers. */
spin_lock_irqsave(&master->priv->seqnr_lock, irqflags);
if (prot_ver > 0) {
hsr_stag->sequence_nr = htons(master->priv->sup_sequence_nr);
master->priv->sup_sequence_nr++;
if (prot_ver == HSR_V1) {
hsr_tag->sequence_nr = htons(master->priv->sequence_nr);
master->priv->sequence_nr++;
}
} else {
hsr_stag->sequence_nr = htons(master->priv->sequence_nr);
master->priv->sequence_nr++;
}
spin_unlock_irqrestore(&master->priv->seqnr_lock, irqflags);
hsr_stag->HSR_TLV_type = type;
/* TODO: Why 12 in HSRv0? */
hsr_stag->HSR_TLV_length =
prot_ver ? sizeof(struct hsr_prp_sup_payload) : 12;
/* Payload: mac_address_a */
hsr_sp = (typeof(hsr_sp))skb_put(skb,
sizeof(struct hsr_prp_sup_payload));
ether_addr_copy(hsr_sp->mac_address_a, master->dev->dev_addr);
skb_put_padto(skb, ETH_ZLEN + HSR_PRP_HLEN);
spin_lock_irqsave(&master->priv->seqnr_lock, irqflags);
if (prot_ver == PRP_V1) {
tail = skb_tail_pointer(skb) - HSR_PRP_HLEN;
rct = (struct prp_rct *)tail;
rct->PRP_suffix = htons(ETH_P_PRP);
set_prp_LSDU_size(rct, HSR_PRP_V1_SUP_LSDUSIZE);
rct->sequence_nr = htons(master->priv->sequence_nr);
master->priv->sequence_nr++;
}
spin_unlock_irqrestore(&master->priv->seqnr_lock, irqflags);
hsr_prp_forward_skb(skb, master);
return;
out:
WARN_ONCE(1, "HSR: Could not send supervision frame
");
kfree_skb(skb);
}
/* Announce (supervision frame) timer function
*/
static void hsr_prp_announce(unsigned long data)
{
struct hsr_prp_priv *priv;
struct hsr_prp_port *master;
priv = (struct hsr_prp_priv *)data;
rcu_read_lock();
master = hsr_prp_get_port(priv, HSR_PRP_PT_MASTER);
if (priv->announce_count < 3 && priv->prot_version == HSR_V0) {
send_supervision_frame(master, HSR_TLV_ANNOUNCE,
priv->prot_version);
priv->announce_count++;
priv->announce_timer.expires = jiffies +
msecs_to_jiffies(HSR_PRP_ANNOUNCE_INTERVAL);
} else {
if (priv->prot_version <= HSR_V1)
send_supervision_frame(master, HSR_TLV_LIFE_CHECK,
priv->prot_version);
else /* PRP */
send_supervision_frame(master, PRP_TLV_LIFE_CHECK_DD,
priv->prot_version);
priv->announce_timer.expires = jiffies +
msecs_to_jiffies(HSR_PRP_LIFE_CHECK_INTERVAL);
}
if (is_admin_up(master->dev))
add_timer(&priv->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_prp_dev_destroy(struct net_device *hsr_prp_dev)
{
struct hsr_prp_priv *priv;
struct hsr_prp_port *port;
priv = netdev_priv(hsr_prp_dev);
hsr_prp_debugfs_term(priv);
rtnl_lock();
hsr_prp_for_each_port(priv, port)
hsr_prp_del_port(port);
rtnl_unlock();
del_timer_sync(&priv->prune_timer);
del_timer_sync(&priv->announce_timer);
synchronize_rcu();
free_netdev(hsr_prp_dev);
}
static const struct net_device_ops hsr_prp_device_ops = {
.ndo_change_mtu = hsr_prp_dev_change_mtu,
.ndo_open = hsr_prp_dev_open,
.ndo_stop = hsr_prp_dev_close,
.ndo_start_xmit = hsr_prp_dev_xmit,
.ndo_fix_features = hsr_prp_fix_features,
};
static void hsr_prp_dev_setup(struct net_device *ndev, struct device_type *type)
{
random_ether_addr(ndev->dev_addr);
ether_setup(ndev);
ndev->header_ops = &hsr_prp_header_ops;
ndev->netdev_ops = &hsr_prp_device_ops;
SET_NETDEV_DEVTYPE(ndev, type);
ndev->priv_flags |= IFF_NO_QUEUE;
ndev->destructor = hsr_prp_dev_destroy;
ndev->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;
ndev->features = ndev->hw_features;
/* Prevent recursive tx locking */
ndev->features |= NETIF_F_LLTX;
/* Not sure about this. Taken from bridge code. netdev_features.h says
* it means "Does not change network namespaces".
*/
ndev->features |= NETIF_F_NETNS_LOCAL;
}
static struct device_type hsr_type = {
.name = "hsr",
};
void hsr_dev_setup(struct net_device *dev)
{
hsr_prp_dev_setup(dev, &hsr_type);
}
static struct device_type prp_type = {
.name = "prp",
};
void prp_dev_setup(struct net_device *dev)
{
hsr_prp_dev_setup(dev, &prp_type);
}
/* Return true if dev is a HSR master; return false otherwise.
*/
inline bool is_hsr_prp_master(struct net_device *dev)
{
return (dev->netdev_ops->ndo_start_xmit == hsr_prp_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_prp_dev_finalize(struct net_device *hsr_prp_dev,
struct net_device *slave[2],
unsigned char multicast_spec, u8 protocol_version)
{
struct hsr_prp_priv *priv;
struct hsr_prp_port *port;
int res;
priv = netdev_priv(hsr_prp_dev);
INIT_LIST_HEAD(&priv->ports);
INIT_LIST_HEAD(&priv->node_db);
INIT_LIST_HEAD(&priv->self_node_db);
ether_addr_copy(hsr_prp_dev->dev_addr, slave[0]->dev_addr);
/* Make sure we recognize frames from ourselves in
* hsr_rcv() or frame is addressed to me
*/
res = hsr_prp_create_self_node(&priv->self_node_db,
hsr_prp_dev->dev_addr,
slave[1]->dev_addr);
if (res < 0)
return res;
if (priv->prot_version == PRP_V1) {
/* For PRP, lan_id has most significant 3 bits holding
* the net_id of PRP_LAN_ID
*/
priv->net_id = PRP_LAN_ID << 1;
}
spin_lock_init(&priv->seqnr_lock);
/* Overflow soon to find bugs easier: */
priv->sequence_nr = HSR_PRP_SEQNR_START;
priv->sup_sequence_nr = HSR_PRP_SUP_SEQNR_START;
init_timer(&priv->announce_timer);
priv->announce_timer.function = hsr_prp_announce;
priv->announce_timer.data = (unsigned long)priv;
init_timer(&priv->prune_timer);
priv->prune_timer.function = hsr_prp_prune_nodes;
priv->prune_timer.data = (unsigned long)priv;
ether_addr_copy(priv->sup_multicast_addr, def_multicast_addr);
priv->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
priv->prot_version = 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_prp_dev);
res = hsr_prp_add_port(priv, hsr_prp_dev, HSR_PRP_PT_MASTER);
if (res)
return res;
/* HSR/PRP LRE Rx offload supported in lower device? */
if (((slave[0]->features & NETIF_F_HW_HSR_RX_OFFLOAD) &&
(slave[1]->features & NETIF_F_HW_HSR_RX_OFFLOAD)) ||
((slave[0]->features & NETIF_F_HW_PRP_RX_OFFLOAD) &&
(slave[1]->features & NETIF_F_HW_PRP_RX_OFFLOAD)))
priv->rx_offloaded = true;
/* HSR LRE L2 forward offload supported in lower device? */
if ((slave[0]->features & NETIF_F_HW_L2FW_DOFFLOAD) &&
(slave[1]->features & NETIF_F_HW_L2FW_DOFFLOAD))
priv->l2_fwd_offloaded = true;
res = register_netdevice(hsr_prp_dev);
if (res)
goto fail;
res = hsr_prp_add_port(priv, slave[0], HSR_PRP_PT_SLAVE_A);
if (res)
goto fail;
res = hsr_prp_add_port(priv, slave[1], HSR_PRP_PT_SLAVE_B);
if (res)
goto fail;
/* for offloaded case, expect both slaves have the
* same MAC address configured. If not fail.
*/
if (priv->rx_offloaded &&
!ether_addr_equal(slave[0]->dev_addr,
slave[1]->dev_addr))
goto fail;
res = hsr_prp_debugfs_init(priv, hsr_prp_dev);
if (res)
goto fail;
/* For LRE rx offload, pruning is expected to happen
* at the hardware or firmware . So don't do this in software
*/
if (!priv->rx_offloaded) {
priv->prune_timer.expires =
jiffies + msecs_to_jiffies(HSR_PRP_PRUNE_PERIOD);
add_timer(&priv->prune_timer);
}
return 0;
fail:
hsr_prp_for_each_port(priv, port)
hsr_prp_del_port(port);
return res;
}
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