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ethercat
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Merge branch 'lock-fixes' into 'master' 

Various locking fixes and improvements

See merge request etherlab.org/ethercat!58
This commit is contained in:
Florian Pose 2022-09-05 09:41:16 +00:00
parent e893051563 81758004fd
commit fa96b8fcb0
5 changed files with 125 additions and 56 deletions
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18
master/domain.c
View File

@ -76,6 +76,7 @@ void ec_domain_init(
domain->data_origin = EC_ORIG_INTERNAL;
domain->logical_base_address = 0x00000000;
INIT_LIST_HEAD(&domain->datagram_pairs);
ec_lock_init(&domain->datagram_pairs_lock);
for (dev_idx = EC_DEVICE_MAIN; dev_idx < ec_master_num_devices(master);
dev_idx++) {
domain->working_counter[dev_idx] = 0x0000;
@ -98,12 +99,15 @@ void ec_domain_clear(ec_domain_t *domain /**< EtherCAT domain */)
{
ec_datagram_pair_t *datagram_pair, *next_pair;
// lockdep_assert_held(&domain->master->domains_lock);
ec_lock_down(&domain->datagram_pairs_lock);
// dequeue and free datagrams
list_for_each_entry_safe(datagram_pair, next_pair,
&domain->datagram_pairs, list) {
ec_datagram_pair_clear(datagram_pair);
kfree(datagram_pair);
}
ec_lock_up(&domain->datagram_pairs_lock);
ec_domain_clear_data(domain);
}
@ -116,6 +120,7 @@ void ec_domain_clear_data(
ec_domain_t *domain /**< EtherCAT domain. */
)
{
// lockdep_assert_held(&domain->master->domains_lock);
if (domain->data_origin == EC_ORIG_INTERNAL && domain->data) {
kfree(domain->data);
}
@ -216,7 +221,9 @@ int ec_domain_add_datagram_pair(
datagram_pair->expected_working_counter);
ec_lock_down(&domain->datagram_pairs_lock);
list_add_tail(&datagram_pair->list, &domain->datagram_pairs);
ec_lock_up(&domain->datagram_pairs_lock);
return 0;
}
@ -389,6 +396,7 @@ int ec_domain_finish(
domain->logical_base_address, domain->data_size,
domain->expected_working_counter);
ec_lock_down(&domain->datagram_pairs_lock);
list_for_each_entry(datagram_pair, &domain->datagram_pairs, list) {
const ec_datagram_t *datagram =
&datagram_pair->datagrams[EC_DEVICE_MAIN];
@ -397,6 +405,7 @@ int ec_domain_finish(
EC_READ_U32(datagram->address), datagram->data_size,
ec_datagram_type_string(datagram), datagram);
}
ec_lock_up(&domain->datagram_pairs_lock);
return 0;
}
@ -512,14 +521,11 @@ void ecrt_domain_external_memory(ec_domain_t *domain, uint8_t *mem)
EC_MASTER_DBG(domain->master, 1, "ecrt_domain_external_memory("
"domain = 0x%p, mem = 0x%p)\n", domain, mem);
ec_lock_down(&domain->master->master_sem);
// lockdep_assert_held(&domain->master->domains_lock);
ec_domain_clear_data(domain);
domain->data = mem;
domain->data_origin = EC_ORIG_EXTERNAL;
ec_lock_up(&domain->master->master_sem);
}
/*****************************************************************************/
@ -551,6 +557,7 @@ void ecrt_domain_process(ec_domain_t *domain)
EC_MASTER_DBG(domain->master, 1, "domain %u process\n", domain->index);
#endif
ec_lock_down(&domain->datagram_pairs_lock);
list_for_each_entry(pair, &domain->datagram_pairs, list) {
#if EC_MAX_NUM_DEVICES > 1
datagram_pair_wc = ec_datagram_pair_process(pair, wc_sum);
@ -638,6 +645,7 @@ void ecrt_domain_process(ec_domain_t *domain)
}
#endif // EC_MAX_NUM_DEVICES > 1
}
ec_lock_up(&domain->datagram_pairs_lock);
#if EC_MAX_NUM_DEVICES > 1
redundant_wc = 0;
@ -726,6 +734,7 @@ void ecrt_domain_queue(ec_domain_t *domain)
ec_datagram_pair_t *datagram_pair;
ec_device_index_t dev_idx;
ec_lock_down(&domain->datagram_pairs_lock);
list_for_each_entry(datagram_pair, &domain->datagram_pairs, list) {
#if EC_MAX_NUM_DEVICES > 1
@ -747,6 +756,7 @@ void ecrt_domain_queue(ec_domain_t *domain)
&datagram_pair->datagrams[dev_idx]);
}
}
ec_lock_up(&domain->datagram_pairs_lock);
}
/*****************************************************************************/

3
master/domain.h
View File

@ -43,6 +43,7 @@
#include "datagram.h"
#include "master.h"
#include "fmmu_config.h"
#include "locks.h"
/*****************************************************************************/
@ -65,6 +66,8 @@ struct ec_domain
process data. */
struct list_head datagram_pairs; /**< Datagrams pairs (main/backup) for
process data exchange. */
ec_lock_t datagram_pairs_lock; /**< Semaphore protecting the
datagram_pairs. */
uint16_t working_counter[EC_MAX_NUM_DEVICES]; /**< Last working counter
values. */
uint16_t expected_working_counter; /**< Expected working counter. */

133
master/ioctl.c
View File

@ -488,11 +488,11 @@ static ATTRIBUTES int ec_ioctl_domain(
return -EFAULT;
}
if (ec_lock_down_interruptible(&master->master_sem))
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain_const(master, data.index))) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_ERR(master, "Domain %u does not exist!\n", data.index);
return -EINVAL;
}
@ -506,7 +506,7 @@ static ATTRIBUTES int ec_ioctl_domain(
data.expected_working_counter = domain->expected_working_counter;
data.fmmu_count = ec_domain_fmmu_count(domain);
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
if (copy_to_user((void __user *) arg, &data, sizeof(data)))
return -EFAULT;
@ -533,18 +533,18 @@ static ATTRIBUTES int ec_ioctl_domain_fmmu(
return -EFAULT;
}
if (ec_lock_down_interruptible(&master->master_sem))
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain_const(master, data.domain_index))) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_ERR(master, "Domain %u does not exist!\n",
data.domain_index);
return -EINVAL;
}
if (!(fmmu = ec_domain_find_fmmu(domain, data.fmmu_index))) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_ERR(master, "Domain %u has less than %u"
" fmmu configurations.\n",
data.domain_index, data.fmmu_index + 1);
@ -558,7 +558,7 @@ static ATTRIBUTES int ec_ioctl_domain_fmmu(
data.logical_address = fmmu->domain->logical_base_address + fmmu->logical_domain_offset;
data.data_size = fmmu->data_size;
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
if (copy_to_user((void __user *) arg, &data, sizeof(data)))
return -EFAULT;
@ -584,18 +584,18 @@ static ATTRIBUTES int ec_ioctl_domain_data(
return -EFAULT;
}
if (ec_lock_down_interruptible(&master->master_sem))
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain_const(master, data.domain_index))) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_ERR(master, "Domain %u does not exist!\n",
data.domain_index);
return -EINVAL;
}
if (domain->data_size != data.data_size) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_ERR(master, "Data size mismatch %u/%zu!\n",
data.data_size, domain->data_size);
return -EFAULT;
@ -603,11 +603,11 @@ static ATTRIBUTES int ec_ioctl_domain_data(
if (copy_to_user((void __user *) data.target, domain->data,
domain->data_size)) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return -EFAULT;
}
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return 0;
}
@ -1875,15 +1875,13 @@ static ATTRIBUTES int ec_ioctl_setup_domain_memory(
ctx->process_data_size = 0;
if (ec_lock_down_interruptible(&master->master_sem))
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
list_for_each_entry(domain, &master->domains, list) {
ctx->process_data_size += ecrt_domain_size(domain);
}
ec_lock_up(&master->master_sem);
if (ctx->process_data_size) {
ctx->process_data = vmalloc(ctx->process_data_size);
if (!ctx->process_data) {
@ -1901,6 +1899,8 @@ static ATTRIBUTES int ec_ioctl_setup_domain_memory(
offset += ecrt_domain_size(domain);
}
ec_lock_up(&master->domains_lock);
#ifdef EC_IOCTL_RTDM
/* RTDM uses a different approach for memory-mapping, which has to be
* initiated by the kernel.
@ -1912,6 +1912,8 @@ static ATTRIBUTES int ec_ioctl_setup_domain_memory(
return ret;
}
#endif
} else {
ec_lock_up(&master->domains_lock);
}
io.process_data_size = ctx->process_data_size;
@ -1959,15 +1961,13 @@ static ATTRIBUTES int ec_ioctl_activate(
ctx->process_data_size = 0;
if (ec_lock_down_interruptible(&master->master_sem))
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
list_for_each_entry(domain, &master->domains, list) {
ctx->process_data_size += ecrt_domain_size(domain);
}
ec_lock_up(&master->master_sem);
if (ctx->process_data_size) {
ctx->process_data = vmalloc(ctx->process_data_size);
if (!ctx->process_data) {
@ -1998,6 +1998,8 @@ static ATTRIBUTES int ec_ioctl_activate(
#endif
}
ec_lock_up(&master->domains_lock);
io.process_data_size = ctx->process_data_size;
}
else
@ -2112,7 +2114,7 @@ static ATTRIBUTES int ec_ioctl_send(
/* Locking added as send is likely to be used by more than
one application tasks */
if (ec_ioctl_lock_down_interruptible(&master->master_sem))
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
if (master->send_cb != NULL) {
@ -2121,7 +2123,7 @@ static ATTRIBUTES int ec_ioctl_send(
} else
sent_bytes = ecrt_master_send(master);
ec_ioctl_lock_up(&master->master_sem);
ec_ioctl_lock_up(&master->io_sem);
if (copy_to_user((void __user *) arg, &sent_bytes, sizeof(sent_bytes))) {
return -EFAULT;
@ -2148,7 +2150,7 @@ static ATTRIBUTES int ec_ioctl_receive(
/* Locking added as receive is likely to be used by more than
one application tasks */
if (ec_ioctl_lock_down_interruptible(&master->master_sem))
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
if (master->receive_cb != NULL)
@ -2156,7 +2158,8 @@ static ATTRIBUTES int ec_ioctl_receive(
else
ecrt_master_receive(master);
ec_ioctl_lock_up(&master->master_sem);
ec_ioctl_lock_up(&master->io_sem);
return 0;
}
@ -2255,7 +2258,10 @@ static ATTRIBUTES int ec_ioctl_sync_ref(
return -EPERM;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
ecrt_master_sync_reference_clock(master);
ec_ioctl_lock_up(&master->io_sem);
return 0;
}
@ -2280,7 +2286,10 @@ static ATTRIBUTES int ec_ioctl_sync_ref_to(
return -EFAULT;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
ecrt_master_sync_reference_clock_to(master, time);
ec_ioctl_lock_up(&master->io_sem);
return 0;
}
@ -2300,7 +2309,10 @@ static ATTRIBUTES int ec_ioctl_sync_slaves(
return -EPERM;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
ecrt_master_sync_slave_clocks(master);
ec_ioctl_lock_up(&master->io_sem);
return 0;
}
@ -2351,7 +2363,10 @@ static ATTRIBUTES int ec_ioctl_64bit_ref_clock_time_queue(
return -EPERM;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
ecrt_master_64bit_reference_clock_time_queue(master);
ec_ioctl_lock_up(&master->io_sem);
return 0;
}
@ -2402,7 +2417,10 @@ static ATTRIBUTES int ec_ioctl_sync_mon_queue(
return -EPERM;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
ecrt_master_sync_monitor_queue(master);
ec_ioctl_lock_up(&master->io_sem);
return 0;
}
@ -2759,12 +2777,24 @@ static ATTRIBUTES int ec_ioctl_sc_reg_pdo_entry(
return -ENOENT;
}
ec_lock_up(&master->master_sem);
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain(master, data.domain_index))) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return -ENOENT;
}
ec_lock_up(&master->domains_lock);
ec_lock_up(&master->master_sem); /** \todo sc or domain could be invalidated */
/** \todo sc or domain could be invalidated */
/* FIXME: As ecrt_slave_config_reg_pdo_entry() calls
* ec_slave_config_prepare_fmmu() which locks master_sem we must release
* domains_lock, as it would break lock ordering, and thus cause
* deadlocks. Unfortunately, this leaves a race condition, as the domain
* could be cleared/deleted while ecrt_slave_config_reg_pdo_entry() is
* called. So the above todo statement still holds :( */
ret = ecrt_slave_config_reg_pdo_entry(sc, data.entry_index,
data.entry_subindex, domain, &data.bit_position);
@ -2808,13 +2838,24 @@ static ATTRIBUTES int ec_ioctl_sc_reg_pdo_pos(
ec_lock_up(&master->master_sem);
return -ENOENT;
}
ec_lock_up(&master->master_sem);
if (ec_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain(master, io.domain_index))) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return -ENOENT;
}
ec_lock_up(&master->domains_lock);
ec_lock_up(&master->master_sem); /** \todo sc or domain could be invalidated */
/** \todo sc or domain could be invalidated */
/* FIXME: As ecrt_slave_config_reg_pdo_entry_pos() calls
* ec_slave_config_prepare_fmmu() which locks master_sem we must release
* domains_lock, as it would break lock ordering, and thus cause
* deadlocks. Unfortunately, this leaves a race condition, as the domain
* could be cleared/deleted while ecrt_slave_config_reg_pdo_entry() is
* called. So the above todo statement still holds :( */
ret = ecrt_slave_config_reg_pdo_entry_pos(sc, io.sync_index,
io.pdo_pos, io.entry_pos, domain, &io.bit_position);
@ -3405,19 +3446,19 @@ static ATTRIBUTES int ec_ioctl_domain_size(
return -EPERM;
}
if (ec_lock_down_interruptible(&master->master_sem)) {
if (ec_lock_down_interruptible(&master->domains_lock)) {
return -EINTR;
}
list_for_each_entry(domain, &master->domains, list) {
if (domain->index == (unsigned long) arg) {
size_t size = ecrt_domain_size(domain);
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return size;
}
}
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return -ENOENT;
}
@ -3439,19 +3480,19 @@ static ATTRIBUTES int ec_ioctl_domain_offset(
if (unlikely(!ctx->requested))
return -EPERM;
if (ec_lock_down_interruptible(&master->master_sem)) {
if (ec_lock_down_interruptible(&master->domains_lock)) {
return -EINTR;
}
list_for_each_entry(domain, &master->domains, list) {
if (domain->index == (unsigned long) arg) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return offset;
}
offset += ecrt_domain_size(domain);
}
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
return -ENOENT;
}
@ -3474,17 +3515,17 @@ static ATTRIBUTES int ec_ioctl_domain_process(
/* Locking added as domain processing is likely to be used by more than
one application tasks */
if (ec_ioctl_lock_down_interruptible(&master->master_sem)) {
if (ec_ioctl_lock_down_interruptible(&master->domains_lock)) {
return -EINTR;
}
if (!(domain = ec_master_find_domain(master, (unsigned long) arg))) {
ec_ioctl_lock_up(&master->master_sem);
ec_ioctl_lock_up(&master->domains_lock);
return -ENOENT;
}
ecrt_domain_process(domain);
ec_ioctl_lock_up(&master->master_sem);
ec_ioctl_lock_up(&master->domains_lock);
return 0;
}
@ -3507,17 +3548,21 @@ static ATTRIBUTES int ec_ioctl_domain_queue(
/* Locking added as domain queing is likely to be used by more than
one application tasks */
if (ec_ioctl_lock_down_interruptible(&master->master_sem))
if (ec_ioctl_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain(master, (unsigned long) arg))) {
ec_ioctl_lock_up(&master->master_sem);
ec_ioctl_lock_up(&master->domains_lock);
return -ENOENT;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem)) {
ec_ioctl_lock_up(&master->domains_lock);
return -EINTR;
}
ecrt_domain_queue(domain);
ec_ioctl_lock_up(&master->io_sem);
ec_ioctl_lock_up(&master->master_sem);
ec_ioctl_lock_up(&master->domains_lock);
return 0;
}
@ -3545,15 +3590,18 @@ static ATTRIBUTES int ec_ioctl_domain_state(
return -EFAULT;
}
/* no locking of master_sem needed, because domain will not be deleted in
* the meantime. */
if (ec_ioctl_lock_down_interruptible(&master->domains_lock))
return -EINTR;
if (!(domain = ec_master_find_domain_const(master, data.domain_index))) {
ec_ioctl_lock_up(&master->domains_lock);
return -ENOENT;
}
ecrt_domain_state(domain, &state);
ec_ioctl_lock_up(&master->domains_lock);
if (copy_to_user((void __user *) data.state, &state, sizeof(state)))
return -EFAULT;
@ -4236,7 +4284,10 @@ static ATTRIBUTES int ec_ioctl_voe_exec(
return -ENOENT;
}
if (ec_ioctl_lock_down_interruptible(&master->io_sem))
return -EINTR;
data.state = ecrt_voe_handler_execute(voe);
ec_ioctl_lock_up(&master->io_sem);
if (data.state == EC_REQUEST_SUCCESS && voe->dir == EC_DIR_INPUT)
data.size = ecrt_voe_handler_data_size(voe);
else

23
master/master.c
View File

@ -186,6 +186,7 @@ int ec_master_init(ec_master_t *master, /**< EtherCAT master */
INIT_LIST_HEAD(&master->configs);
INIT_LIST_HEAD(&master->domains);
ec_lock_init(&master->domains_lock);
master->app_time = 0ULL;
master->dc_ref_time = 0ULL;
@ -534,11 +535,13 @@ void ec_master_clear_domains(ec_master_t *master)
{
ec_domain_t *domain, *next;
ec_lock_down(&master->domains_lock);
list_for_each_entry_safe(domain, next, &master->domains, list) {
list_del(&domain->list);
ec_domain_clear(domain);
kfree(domain);
}
ec_lock_up(&master->domains_lock);
}
/*****************************************************************************/
@ -564,9 +567,7 @@ void ec_master_internal_send_cb(
)
{
ec_master_t *master = (ec_master_t *) cb_data;
ec_lock_down(&master->io_sem);
ecrt_master_send_ext(master);
ec_lock_up(&master->io_sem);
}
/*****************************************************************************/
@ -578,9 +579,7 @@ void ec_master_internal_receive_cb(
)
{
ec_master_t *master = (ec_master_t *) cb_data;
ec_lock_down(&master->io_sem);
ecrt_master_receive(master);
ec_lock_up(&master->io_sem);
}
/*****************************************************************************/
@ -1889,7 +1888,9 @@ static int ec_master_eoe_thread(void *priv_data)
}
// receive datagrams
ec_lock_down(&master->io_sem);
master->receive_cb(master->cb_data);
ec_lock_up(&master->io_sem);
// actual EoE processing
sth_to_send = 0;
@ -1904,9 +1905,11 @@ static int ec_master_eoe_thread(void *priv_data)
}
if (sth_to_send) {
ec_lock_down(&master->io_sem);
list_for_each_entry(eoe, &master->eoe_handlers, list) {
ec_eoe_queue(eoe);
}
ec_lock_up(&master->io_sem);
// (try to) send datagrams
ec_lock_down(&master->ext_queue_sem);
master->send_cb(master->cb_data);
@ -2089,9 +2092,11 @@ unsigned int ec_master_domain_count(
const ec_domain_t *domain;
unsigned int count = 0;
ec_lock_down(&master->domains_lock);
list_for_each_entry(domain, &master->domains, list) {
count++;
}
ec_lock_up(&master->domains_lock);
return count;
}
@ -2437,7 +2442,7 @@ ec_domain_t *ecrt_master_create_domain_err(
return ERR_PTR(-ENOMEM);
}
ec_lock_down(&master->master_sem);
ec_lock_down(&master->domains_lock);
if (list_empty(&master->domains)) {
index = 0;
@ -2449,7 +2454,7 @@ ec_domain_t *ecrt_master_create_domain_err(
ec_domain_init(domain, master, index);
list_add_tail(&domain->list, &master->domains);
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_DBG(master, 1, "Created domain %u.\n", domain->index);
@ -2492,21 +2497,21 @@ int ecrt_master_activate(ec_master_t *master)
return 0;
}
ec_lock_down(&master->master_sem);
ec_lock_down(&master->domains_lock);
// finish all domains
domain_offset = 0;
list_for_each_entry(domain, &master->domains, list) {
ret = ec_domain_finish(domain, domain_offset);
if (ret < 0) {
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
EC_MASTER_ERR(master, "Failed to finish domain 0x%p!\n", domain);
return ret;
}
domain_offset += domain->data_size;
}
ec_lock_up(&master->master_sem);
ec_lock_up(&master->domains_lock);
// restart EoE process and master thread with new locking

4
master/master.h
View File

@ -229,6 +229,7 @@ struct ec_master {
/* Configuration applied by the application. */
struct list_head configs; /**< List of slave configurations. */
struct list_head domains; /**< List of domains. */
ec_lock_t domains_lock; /**< Lock for access to domains list. */
u64 app_time; /**< Time of the last ecrt_master_sync() call. */
u64 dc_ref_time; /**< Common reference timestamp for DC start times. */
@ -260,6 +261,7 @@ struct ec_master {
struct list_head datagram_queue; /**< Datagram queue. */
uint8_t datagram_index; /**< Current datagram index. */
ec_lock_t io_sem; /**< Semaphore protecting the datagram_queue. */
struct list_head ext_datagram_queue; /**< Queue for non-application
datagrams. */
@ -290,8 +292,6 @@ struct ec_master {
struct list_head eoe_handlers; /**< Ethernet over EtherCAT handlers. */
#endif
ec_lock_t io_sem; /**< Semaphore used in \a IDLE phase. */
void (*send_cb)(void *); /**< Current send datagrams callback. */
void (*receive_cb)(void *); /**< Current receive datagrams callback. */
void *cb_data; /**< Current callback data. */