// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/cfm_bridge.h>
#include <uapi/linux/cfm_bridge.h>
#include "br_private_cfm.h"
static struct br_cfm_mep *br_mep_find(struct net_bridge *br, u32 instance)
{
struct br_cfm_mep *mep;
hlist_for_each_entry(mep, &br->mep_list, head)
if (mep->instance == instance)
return mep;
return NULL;
}
static struct br_cfm_mep *br_mep_find_ifindex(struct net_bridge *br,
u32 ifindex)
{
struct br_cfm_mep *mep;
hlist_for_each_entry_rcu(mep, &br->mep_list, head,
lockdep_rtnl_is_held())
if (mep->create.ifindex == ifindex)
return mep;
return NULL;
}
static struct br_cfm_peer_mep *br_peer_mep_find(struct br_cfm_mep *mep,
u32 mepid)
{
struct br_cfm_peer_mep *peer_mep;
hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head,
lockdep_rtnl_is_held())
if (peer_mep->mepid == mepid)
return peer_mep;
return NULL;
}
static struct net_bridge_port *br_mep_get_port(struct net_bridge *br,
u32 ifindex)
{
struct net_bridge_port *port;
list_for_each_entry(port, &br->port_list, list)
if (port->dev->ifindex == ifindex)
return port;
return NULL;
}
/* Calculate the CCM interval in us. */
static u32 interval_to_us(enum br_cfm_ccm_interval interval)
{
switch (interval) {
case BR_CFM_CCM_INTERVAL_NONE:
return 0;
case BR_CFM_CCM_INTERVAL_3_3_MS:
return 3300;
case BR_CFM_CCM_INTERVAL_10_MS:
return 10 * 1000;
case BR_CFM_CCM_INTERVAL_100_MS:
return 100 * 1000;
case BR_CFM_CCM_INTERVAL_1_SEC:
return 1000 * 1000;
case BR_CFM_CCM_INTERVAL_10_SEC:
return 10 * 1000 * 1000;
case BR_CFM_CCM_INTERVAL_1_MIN:
return 60 * 1000 * 1000;
case BR_CFM_CCM_INTERVAL_10_MIN:
return 10 * 60 * 1000 * 1000;
}
return 0;
}
/* Convert the interface interval to CCM PDU value. */
static u32 interval_to_pdu(enum br_cfm_ccm_interval interval)
{
switch (interval) {
case BR_CFM_CCM_INTERVAL_NONE:
return 0;
case BR_CFM_CCM_INTERVAL_3_3_MS:
return 1;
case BR_CFM_CCM_INTERVAL_10_MS:
return 2;
case BR_CFM_CCM_INTERVAL_100_MS:
return 3;
case BR_CFM_CCM_INTERVAL_1_SEC:
return 4;
case BR_CFM_CCM_INTERVAL_10_SEC:
return 5;
case BR_CFM_CCM_INTERVAL_1_MIN:
return 6;
case BR_CFM_CCM_INTERVAL_10_MIN:
return 7;
}
return 0;
}
/* Convert the CCM PDU value to interval on interface. */
static u32 pdu_to_interval(u32 value)
{
switch (value) {
case 0:
return BR_CFM_CCM_INTERVAL_NONE;
case 1:
return BR_CFM_CCM_INTERVAL_3_3_MS;
case 2:
return BR_CFM_CCM_INTERVAL_10_MS;
case 3:
return BR_CFM_CCM_INTERVAL_100_MS;
case 4:
return BR_CFM_CCM_INTERVAL_1_SEC;
case 5:
return BR_CFM_CCM_INTERVAL_10_SEC;
case 6:
return BR_CFM_CCM_INTERVAL_1_MIN;
case 7:
return BR_CFM_CCM_INTERVAL_10_MIN;
}
return BR_CFM_CCM_INTERVAL_NONE;
}
static void ccm_rx_timer_start(struct br_cfm_peer_mep *peer_mep)
{
u32 interval_us;
interval_us = interval_to_us(peer_mep->mep->cc_config.exp_interval);
/* Function ccm_rx_dwork must be called with 1/4
* of the configured CC 'expected_interval'
* in order to detect CCM defect after 3.25 interval.
*/
queue_delayed_work(system_wq, &peer_mep->ccm_rx_dwork,
usecs_to_jiffies(interval_us / 4));
}
static void br_cfm_notify(int event, const struct net_bridge_port *port)
{
u32 filter = RTEXT_FILTER_CFM_STATUS;
br_info_notify(event, port->br, NULL, filter);
}
static void cc_peer_enable(struct br_cfm_peer_mep *peer_mep)
{
memset(&peer_mep->cc_status, 0, sizeof(peer_mep->cc_status));
peer_mep->ccm_rx_count_miss = 0;
ccm_rx_timer_start(peer_mep);
}
static void cc_peer_disable(struct br_cfm_peer_mep *peer_mep)
{
cancel_delayed_work_sync(&peer_mep->ccm_rx_dwork);
}
static struct sk_buff *ccm_frame_build(struct br_cfm_mep *mep,
const struct br_cfm_cc_ccm_tx_info *const tx_info)
{
struct br_cfm_common_hdr *common_hdr;
struct net_bridge_port *b_port;
struct br_cfm_maid *maid;
u8 *itu_reserved, *e_tlv;
struct ethhdr *eth_hdr;
struct sk_buff *skb;
__be32 *status_tlv;
__be32 *snumber;
__be16 *mepid;
skb = dev_alloc_skb(CFM_CCM_MAX_FRAME_LENGTH);
if (!skb)
return NULL;
rcu_read_lock();
b_port = rcu_dereference(mep->b_port);
if (!b_port) {
kfree_skb(skb);
rcu_read_unlock();
return NULL;
}
skb->dev = b_port->dev;
rcu_read_unlock();
/* The device cannot be deleted until the work_queue functions has
* completed. This function is called from ccm_tx_work_expired()
* that is a work_queue functions.
*/
skb->protocol = htons(ETH_P_CFM);
skb->priority = CFM_FRAME_PRIO;
/* Ethernet header */
eth_hdr = skb_put(skb, sizeof(*eth_hdr));
ether_addr_copy(eth_hdr->h_dest, tx_info->dmac.addr);
ether_addr_copy(eth_hdr->h_source, mep->config.unicast_mac.addr);
eth_hdr->h_proto = htons(ETH_P_CFM);
/* Common CFM Header */
common_hdr = skb_put(skb, sizeof(*common_hdr));
common_hdr->mdlevel_version = mep->config.mdlevel << 5;
common_hdr->opcode = BR_CFM_OPCODE_CCM;
common_hdr->flags = (mep->rdi << 7) |
interval_to_pdu(mep->cc_config.exp_interval);
common_hdr->tlv_offset = CFM_CCM_TLV_OFFSET;
/* Sequence number */
snumber = skb_put(skb, sizeof(*snumber));
if (tx_info->seq_no_update) {
*snumber = cpu_to_be32(mep->ccm_tx_snumber);
mep->ccm_tx_snumber += 1;
} else {
*snumber = 0;
}
mepid = skb_put(skb, sizeof(*mepid));
*mepid = cpu_to_be16((u16)mep->config.mepid);
maid = skb_put(skb, sizeof(*maid));
memcpy(maid->data, mep->cc_config.exp_maid.data, sizeof(maid->data));
/* ITU reserved (CFM_CCM_ITU_RESERVED_SIZE octets) */
itu_reserved = skb_put(skb, CFM_CCM_ITU_RESERVED_SIZE);
memset(itu_reserved, 0, CFM_CCM_ITU_RESERVED_SIZE);
/* Generel CFM TLV format:
* TLV type: one byte
* TLV value length: two bytes
* TLV value: 'TLV value length' bytes
*/
/* Port status TLV. The value length is 1. Total of 4 bytes. */
if (tx_info->port_tlv) {
status_tlv = skb_put(skb, sizeof(*status_tlv));
*status_tlv = cpu_to_be32((CFM_PORT_STATUS_TLV_TYPE << 24) |
(1 << 8) | /* Value length */
(tx_info->port_tlv_value & 0xFF));
}
/* Interface status TLV. The value length is 1. Total of 4 bytes. */
if (tx_info->if_tlv) {
status_tlv = skb_put(skb, sizeof(*status_tlv));
*status_tlv = cpu_to_be32((CFM_IF_STATUS_TLV_TYPE << 24) |
(1 << 8) | /* Value length */
(tx_info->if_tlv_value & 0xFF));
}
/* End TLV */
e_tlv = skb_put(skb, sizeof(*e_tlv));
*e_tlv = CFM_ENDE_TLV_TYPE;
return skb;
}
static void ccm_frame_tx(struct sk_buff *skb)
{
skb_reset_network_header(skb);
dev_queue_xmit(skb);
}
/* This function is called with the configured CC 'expected_interval'
* in order to drive CCM transmission when enabled.
*/
static void ccm_tx_work_expired(struct work_struct *work)
{
struct delayed_work *del_work;
struct br_cfm_mep *mep;
struct sk_buff *skb;
u32 interval_us;
del_work = to_delayed_work(work);
mep = container_of(del_work, struct br_cfm_mep, ccm_tx_dwork);
if (time_before_eq(mep->ccm_tx_end, jiffies)) {
/* Transmission period has ended */
mep->cc_ccm_tx_info.period = 0;
return;
}
skb = ccm_frame_build(mep, &mep->cc_ccm_tx_info);
if (skb)
ccm_frame_tx(skb);
interval_us = interval_to_us(mep->cc_config.exp_interval);
queue_delayed_work(system_wq, &mep->ccm_tx_dwork,
usecs_to_jiffies(interval_us));
}
/* This function is called with 1/4 of the configured CC 'expected_interval'
* in order to detect CCM defect after 3.25 interval.
*/
static void ccm_rx_work_expired(struct work_struct *work)
{
struct br_cfm_peer_mep *peer_mep;
struct net_bridge_port *b_port;
struct delayed_work *del_work;
del_work = to_delayed_work(work);
peer_mep = container_of(del_work, struct br_cfm_peer_mep, ccm_rx_dwork);
/* After 13 counts (4 * 3,25) then 3.25 intervals are expired */
if (peer_mep->ccm_rx_count_miss < 13) {
/* 3.25 intervals are NOT expired without CCM reception */
peer_mep->ccm_rx_count_miss++;
/* Start timer again */
ccm_rx_timer_start(peer_mep);
} else {
/* 3.25 intervals are expired without CCM reception.
* CCM defect detected
*/
peer_mep->cc_status.ccm_defect = true;
/* Change in CCM defect status - notify */
rcu_read_lock();
b_port = rcu_dereference(peer_mep->mep->b_port);
if (b_port)
br_cfm_notify(RTM_NEWLINK, b_port);
rcu_read_unlock();
}
}
static u32 ccm_tlv_extract(struct sk_buff *skb, u32 index,
struct br_cfm_peer_mep *peer_mep)
{
__be32 *s_tlv;
__be32 _s_tlv;
u32 h_s_tlv;
u8 *e_tlv;
u8 _e_tlv;
e_tlv = skb_header_pointer(skb, index, sizeof(_e_tlv), &_e_tlv);
if (!e_tlv)
return 0;
/* TLV is present - get the status TLV */
s_tlv = skb_header_pointer(skb,
index,
sizeof(_s_tlv), &_s_tlv);
if (!s_tlv)
return 0;
h_s_tlv = ntohl(*s_tlv);
if ((h_s_tlv >> 24) == CFM_IF_STATUS_TLV_TYPE) {
/* Interface status TLV */
peer_mep->cc_status.tlv_seen = true;
peer_mep->cc_status.if_tlv_value = (h_s_tlv & 0xFF);
}
if ((h_s_tlv >> 24) == CFM_PORT_STATUS_TLV_TYPE) {
/* Port status TLV */
peer_mep->cc_status.tlv_seen = true;
peer_mep->cc_status.port_tlv_value = (h_s_tlv & 0xFF);
}
/* The Sender ID TLV is not handled */
/* The Organization-Specific TLV is not handled */
/* Return the length of this tlv.
* This is the length of the value field plus 3 bytes for size of type
* field and length field
*/
return ((h_s_tlv >> 8) & 0xFFFF) + 3;
}
/* note: already called with rcu_read_lock */
static int br_cfm_frame_rx(struct net_bridge_port *port, struct sk_buff *skb)
{
u32 mdlevel, interval, size, index, max;
const struct br_cfm_common_hdr *hdr;
struct br_cfm_peer_mep *peer_mep;
const struct br_cfm_maid *maid;
struct br_cfm_common_hdr _hdr;
struct br_cfm_maid _maid;
struct br_cfm_mep *mep;
struct net_bridge *br;
__be32 *snumber;
__be32 _snumber;
__be16 *mepid;
__be16 _mepid;
if (port->state == BR_STATE_DISABLED)
return 0;
hdr = skb_header_pointer(skb, 0, sizeof(_hdr), &_hdr);
if (!hdr)
return 1;
br = port->br;
mep = br_mep_find_ifindex(br, port->dev->ifindex);
if (unlikely(!mep))
/* No MEP on this port - must be forwarded */
return 0;
mdlevel = hdr->mdlevel_version >> 5;
if (mdlevel > mep->config.mdlevel)
/* The level is above this MEP level - must be forwarded */
return 0;
if ((hdr->mdlevel_version & 0x1F) != 0) {
/* Invalid version */
mep->status.version_unexp_seen = true;
return 1;
}
if (mdlevel < mep->config.mdlevel) {
/* The level is below this MEP level */
mep->status.rx_level_low_seen = true;
return 1;
}
if (hdr->opcode == BR_CFM_OPCODE_CCM) {
/* CCM PDU received. */
/* MA ID is after common header + sequence number + MEP ID */
maid = skb_header_pointer(skb,
CFM_CCM_PDU_MAID_OFFSET,
sizeof(_maid), &_maid);
if (!maid)
return 1;
if (memcmp(maid->data, mep->cc_config.exp_maid.data,
sizeof(maid->data)))
/* MA ID not as expected */
return 1;
/* MEP ID is after common header + sequence number */
mepid = skb_header_pointer(skb,
CFM_CCM_PDU_MEPID_OFFSET,
sizeof(_mepid), &_mepid);
if (!mepid)
return 1;
peer_mep = br_peer_mep_find(mep, (u32)ntohs(*mepid));
if (!peer_mep)
return 1;
/* Interval is in common header flags */
interval = hdr->flags & 0x07;
if (mep->cc_config.exp_interval != pdu_to_interval(interval))
/* Interval not as expected */
return 1;
/* A valid CCM frame is received */
if (peer_mep->cc_status.ccm_defect) {
peer_mep->cc_status.ccm_defect = false;
/* Change in CCM defect status - notify */
br_cfm_notify(RTM_NEWLINK, port);
/* Start CCM RX timer */
ccm_rx_timer_start(peer_mep);
}
peer_mep->cc_status.seen = true;
peer_mep->ccm_rx_count_miss = 0;
/* RDI is in common header flags */
peer_mep->cc_status.rdi = (hdr->flags & 0x80) ? true : false;
/* Sequence number is after common header */
snumber = skb_header_pointer(skb,
CFM_CCM_PDU_SEQNR_OFFSET,
sizeof(_snumber), &_snumber);
if (!snumber)
return 1;
if (ntohl(*snumber) != (mep->ccm_rx_snumber + 1))
/* Unexpected sequence number */
peer_mep->cc_status.seq_unexp_seen = true;
mep->ccm_rx_snumber = ntohl(*snumber);
/* TLV end is after common header + sequence number + MEP ID +
* MA ID + ITU reserved
*/
index = CFM_CCM_PDU_TLV_OFFSET;
max = 0;
do { /* Handle all TLVs */
size = ccm_tlv_extract(skb, index, peer_mep);
index += size;
max += 1;
} while (size != 0 && max < 4); /* Max four TLVs possible */
return 1;
}
mep->status.opcode_unexp_seen = true;
return 1;
}
static struct br_frame_type cfm_frame_type __read_mostly = {
.type = cpu_to_be16(ETH_P_CFM),
.frame_handler = br_cfm_frame_rx,
};
int br_cfm_mep_create(struct net_bridge *br,
const u32 instance,
struct br_cfm_mep_create *const create,
struct netlink_ext_ack *extack)
{
struct net_bridge_port *p;
struct br_cfm_mep *mep;
ASSERT_RTNL();
if (create->domain == BR_CFM_VLAN) {
NL_SET_ERR_MSG_MOD(extack,
"VLAN domain not supported");
return -EINVAL;
}
if (create->domain != BR_CFM_PORT) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid domain value");
return -EINVAL;
}
if (create->direction == BR_CFM_MEP_DIRECTION_UP) {
NL_SET_ERR_MSG_MOD(extack,
"Up-MEP not supported");
return -EINVAL;
}
if (create->direction != BR_CFM_MEP_DIRECTION_DOWN) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid direction value");
return -EINVAL;
}
p = br_mep_get_port(br, create->ifindex);
if (!p) {
NL_SET_ERR_MSG_MOD(extack,
"Port is not related to bridge");
return -EINVAL;
}
mep = br_mep_find(br, instance);
if (mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance already exists");
return -EEXIST;
}
/* In PORT domain only one instance can be created per port */
if (create->domain == BR_CFM_PORT) {
mep = br_mep_find_ifindex(br, create->ifindex);
if (mep) {
NL_SET_ERR_MSG_MOD(extack,
"Only one Port MEP on a port allowed");
return -EINVAL;
}
}
mep = kzalloc(sizeof(*mep), GFP_KERNEL);
if (!mep)
return -ENOMEM;
mep->create = *create;
mep->instance = instance;
rcu_assign_pointer(mep->b_port, p);
INIT_HLIST_HEAD(&mep->peer_mep_list);
INIT_DELAYED_WORK(&mep->ccm_tx_dwork, ccm_tx_work_expired);
if (hlist_empty(&br->mep_list))
br_add_frame(br, &cfm_frame_type);
hlist_add_tail_rcu(&mep->head, &br->mep_list);
return 0;
}
static void mep_delete_implementation(struct net_bridge *br,
struct br_cfm_mep *mep)
{
struct br_cfm_peer_mep *peer_mep;
struct hlist_node *n_store;
ASSERT_RTNL();
/* Empty and free peer MEP list */
hlist_for_each_entry_safe(peer_mep, n_store, &mep->peer_mep_list, head) {
cancel_delayed_work_sync(&peer_mep->ccm_rx_dwork);
hlist_del_rcu(&peer_mep->head);
kfree_rcu(peer_mep, rcu);
}
cancel_delayed_work_sync(&mep->ccm_tx_dwork);
RCU_INIT_POINTER(mep->b_port, NULL);
hlist_del_rcu(&mep->head);
kfree_rcu(mep, rcu);
if (hlist_empty(&br->mep_list))
br_del_frame(br, &cfm_frame_type);
}
int br_cfm_mep_delete(struct net_bridge *br,
const u32 instance,
struct netlink_ext_ack *extack)
{
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
mep_delete_implementation(br, mep);
return 0;
}
int br_cfm_mep_config_set(struct net_bridge *br,
const u32 instance,
const struct br_cfm_mep_config *const config,
struct netlink_ext_ack *extack)
{
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
mep->config = *config;
return 0;
}
int br_cfm_cc_config_set(struct net_bridge *br,
const u32 instance,
const struct br_cfm_cc_config *const config,
struct netlink_ext_ack *extack)
{
struct br_cfm_peer_mep *peer_mep;
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
/* Check for no change in configuration */
if (memcmp(config, &mep->cc_config, sizeof(*config)) == 0)
return 0;
if (config->enable && !mep->cc_config.enable)
/* CC is enabled */
hlist_for_each_entry(peer_mep, &mep->peer_mep_list, head)
cc_peer_enable(peer_mep);
if (!config->enable && mep->cc_config.enable)
/* CC is disabled */
hlist_for_each_entry(peer_mep, &mep->peer_mep_list, head)
cc_peer_disable(peer_mep);
mep->cc_config = *config;
mep->ccm_rx_snumber = 0;
mep->ccm_tx_snumber = 1;
return 0;
}
int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
u32 mepid,
struct netlink_ext_ack *extack)
{
struct br_cfm_peer_mep *peer_mep;
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
peer_mep = br_peer_mep_find(mep, mepid);
if (peer_mep) {
NL_SET_ERR_MSG_MOD(extack,
"Peer MEP-ID already exists");
return -EEXIST;
}
peer_mep = kzalloc(sizeof(*peer_mep), GFP_KERNEL);
if (!peer_mep)
return -ENOMEM;
peer_mep->mepid = mepid;
peer_mep->mep = mep;
INIT_DELAYED_WORK(&peer_mep->ccm_rx_dwork, ccm_rx_work_expired);
if (mep->cc_config.enable)
cc_peer_enable(peer_mep);
hlist_add_tail_rcu(&peer_mep->head, &mep->peer_mep_list);
return 0;
}
int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const u32 instance,
u32 mepid,
struct netlink_ext_ack *extack)
{
struct br_cfm_peer_mep *peer_mep;
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
peer_mep = br_peer_mep_find(mep, mepid);
if (!peer_mep) {
NL_SET_ERR_MSG_MOD(extack,
"Peer MEP-ID does not exists");
return -ENOENT;
}
cc_peer_disable(peer_mep);
hlist_del_rcu(&peer_mep->head);
kfree_rcu(peer_mep, rcu);
return 0;
}
int br_cfm_cc_rdi_set(struct net_bridge *br, const u32 instance,
const bool rdi, struct netlink_ext_ack *extack)
{
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
mep->rdi = rdi;
return 0;
}
int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32 instance,
const struct br_cfm_cc_ccm_tx_info *const tx_info,
struct netlink_ext_ack *extack)
{
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
if (memcmp(tx_info, &mep->cc_ccm_tx_info, sizeof(*tx_info)) == 0) {
/* No change in tx_info. */
if (mep->cc_ccm_tx_info.period == 0)
/* Transmission is not enabled - just return */
return 0;
/* Transmission is ongoing, the end time is recalculated */
mep->ccm_tx_end = jiffies +
usecs_to_jiffies(tx_info->period * 1000000);
return 0;
}
if (tx_info->period == 0 && mep->cc_ccm_tx_info.period == 0)
/* Some change in info and transmission is not ongoing */
goto save;
if (tx_info->period != 0 && mep->cc_ccm_tx_info.period != 0) {
/* Some change in info and transmission is ongoing
* The end time is recalculated
*/
mep->ccm_tx_end = jiffies +
usecs_to_jiffies(tx_info->period * 1000000);
goto save;
}
if (tx_info->period == 0 && mep->cc_ccm_tx_info.period != 0) {
cancel_delayed_work_sync(&mep->ccm_tx_dwork);
goto save;
}
/* Start delayed work to transmit CCM frames. It is done with zero delay
* to send first frame immediately
*/
mep->ccm_tx_end = jiffies + usecs_to_jiffies(tx_info->period * 1000000);
queue_delayed_work(system_wq, &mep->ccm_tx_dwork, 0);
save:
mep->cc_ccm_tx_info = *tx_info;
return 0;
}
int br_cfm_mep_count(struct net_bridge *br, u32 *count)
{
struct br_cfm_mep *mep;
*count = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(mep, &br->mep_list, head)
*count += 1;
rcu_read_unlock();
return 0;
}
int br_cfm_peer_mep_count(struct net_bridge *br, u32 *count)
{
struct br_cfm_peer_mep *peer_mep;
struct br_cfm_mep *mep;
*count = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(mep, &br->mep_list, head)
hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head)
*count += 1;
rcu_read_unlock();
return 0;
}
bool br_cfm_created(struct net_bridge *br)
{
return !hlist_empty(&br->mep_list);
}
/* Deletes the CFM instances on a specific bridge port
*/
void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *port)
{
struct hlist_node *n_store;
struct br_cfm_mep *mep;
ASSERT_RTNL();
hlist_for_each_entry_safe(mep, n_store, &br->mep_list, head)
if (mep->create.ifindex == port->dev->ifindex)
mep_delete_implementation(br, mep);
}
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