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links.c
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links.c
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/*
* Copyright (C) 2012-2019 Red Hat, Inc. All rights reserved.
*
* Authors: Fabio M. Di Nitto <fabbione@kronosnet.org>
* Federico Simoncelli <fsimon@kronosnet.org>
*
* This software licensed under LGPL-2.0+
*/
#include "config.h"
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <pthread.h>
#include "internals.h"
#include "logging.h"
#include "links.h"
#include "transports.h"
#include "host.h"
#include "threads_common.h"
#include "links_acl.h"
int _link_updown(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
unsigned int enabled, unsigned int connected)
{
struct knet_host *host = knet_h->host_index[host_id];
struct knet_link *link = &host->link[link_id];
int notify_status = link->status.connected;
if ((link->status.enabled == enabled) &&
(link->status.connected == connected))
return 0;
if ((link->status.enabled) &&
(knet_h->link_status_change_notify_fn)) {
if (link->status.connected != connected) {
notify_status = connected; /* connection state */
}
if (!enabled) {
notify_status = 0; /* disable == disconnected */
}
knet_h->link_status_change_notify_fn(
knet_h->link_status_change_notify_fn_private_data,
host_id,
link_id,
notify_status,
host->status.remote,
host->status.external);
}
link->status.enabled = enabled;
link->status.connected = connected;
_host_dstcache_update_async(knet_h, host);
if ((link->status.dynconnected) &&
(!link->status.connected))
link->status.dynconnected = 0;
if (connected) {
time(&link->status.stats.last_up_times[link->status.stats.last_up_time_index]);
link->status.stats.up_count++;
if (++link->status.stats.last_up_time_index >= MAX_LINK_EVENTS) {
link->status.stats.last_up_time_index = 0;
}
} else {
time(&link->status.stats.last_down_times[link->status.stats.last_down_time_index]);
link->status.stats.down_count++;
if (++link->status.stats.last_down_time_index >= MAX_LINK_EVENTS) {
link->status.stats.last_down_time_index = 0;
}
}
return 0;
}
void _link_clear_stats(knet_handle_t knet_h)
{
struct knet_host *host;
struct knet_link *link;
uint32_t host_id;
uint8_t link_id;
for (host_id = 0; host_id < KNET_MAX_HOST; host_id++) {
host = knet_h->host_index[host_id];
if (!host) {
continue;
}
for (link_id = 0; link_id < KNET_MAX_LINK; link_id++) {
link = &host->link[link_id];
memset(&link->status.stats, 0, sizeof(struct knet_link_stats));
}
}
}
int knet_link_set_config(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t transport,
struct sockaddr_storage *src_addr,
struct sockaddr_storage *dst_addr,
uint64_t flags)
{
int savederrno = 0, err = 0, i;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (!src_addr) {
errno = EINVAL;
return -1;
}
if (dst_addr && (src_addr->ss_family != dst_addr->ss_family)) {
log_err(knet_h, KNET_SUB_LINK, "Source address family does not match destination address family");
errno = EINVAL;
return -1;
}
if (transport >= KNET_MAX_TRANSPORTS) {
errno = EINVAL;
return -1;
}
savederrno = get_global_wrlock(knet_h);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get write lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
if (transport == KNET_TRANSPORT_LOOPBACK && knet_h->host_id != host_id) {
log_err(knet_h, KNET_SUB_LINK, "Cannot create loopback link to remote node");
err = -1;
savederrno = EINVAL;
goto exit_unlock;
}
if (knet_h->host_id == host_id && knet_h->has_loop_link) {
log_err(knet_h, KNET_SUB_LINK, "Cannot create more than 1 link when loopback is active");
err = -1;
savederrno = EINVAL;
goto exit_unlock;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
if (transport == KNET_TRANSPORT_LOOPBACK && knet_h->host_id == host_id) {
for (i=0; i<KNET_MAX_LINK; i++) {
if (host->link[i].configured) {
log_err(knet_h, KNET_SUB_LINK, "Cannot add loopback link when other links are already configured.");
err = -1;
savederrno = EINVAL;
goto exit_unlock;
}
}
}
link = &host->link[link_id];
if (link->configured != 0) {
err =-1;
savederrno = EBUSY;
log_err(knet_h, KNET_SUB_LINK, "Host %u link %u is currently configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
if (link->status.enabled != 0) {
err =-1;
savederrno = EBUSY;
log_err(knet_h, KNET_SUB_LINK, "Host %u link %u is currently in use: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
memmove(&link->src_addr, src_addr, sizeof(struct sockaddr_storage));
err = knet_addrtostr(src_addr, sizeof(struct sockaddr_storage),
link->status.src_ipaddr, KNET_MAX_HOST_LEN,
link->status.src_port, KNET_MAX_PORT_LEN);
if (err) {
if (err == EAI_SYSTEM) {
savederrno = errno;
log_warn(knet_h, KNET_SUB_LINK,
"Unable to resolve host: %u link: %u source addr/port: %s",
host_id, link_id, strerror(savederrno));
} else {
savederrno = EINVAL;
log_warn(knet_h, KNET_SUB_LINK,
"Unable to resolve host: %u link: %u source addr/port: %s",
host_id, link_id, gai_strerror(err));
}
err = -1;
goto exit_unlock;
}
if (!dst_addr) {
link->dynamic = KNET_LINK_DYNIP;
} else {
link->dynamic = KNET_LINK_STATIC;
memmove(&link->dst_addr, dst_addr, sizeof(struct sockaddr_storage));
err = knet_addrtostr(dst_addr, sizeof(struct sockaddr_storage),
link->status.dst_ipaddr, KNET_MAX_HOST_LEN,
link->status.dst_port, KNET_MAX_PORT_LEN);
if (err) {
if (err == EAI_SYSTEM) {
savederrno = errno;
log_warn(knet_h, KNET_SUB_LINK,
"Unable to resolve host: %u link: %u destination addr/port: %s",
host_id, link_id, strerror(savederrno));
} else {
savederrno = EINVAL;
log_warn(knet_h, KNET_SUB_LINK,
"Unable to resolve host: %u link: %u destination addr/port: %s",
host_id, link_id, gai_strerror(err));
}
err = -1;
goto exit_unlock;
}
}
link->pmtud_crypto_timeout_multiplier = KNET_LINK_PMTUD_CRYPTO_TIMEOUT_MULTIPLIER_MIN;
link->pong_count = KNET_LINK_DEFAULT_PONG_COUNT;
link->has_valid_mtu = 0;
link->ping_interval = KNET_LINK_DEFAULT_PING_INTERVAL * 1000; /* microseconds */
link->pong_timeout = KNET_LINK_DEFAULT_PING_TIMEOUT * 1000; /* microseconds */
link->pong_timeout_backoff = KNET_LINK_PONG_TIMEOUT_BACKOFF;
link->pong_timeout_adj = link->pong_timeout * link->pong_timeout_backoff; /* microseconds */
link->latency_fix = KNET_LINK_DEFAULT_PING_PRECISION;
link->latency_exp = KNET_LINK_DEFAULT_PING_PRECISION - \
((link->ping_interval * KNET_LINK_DEFAULT_PING_PRECISION) / 8000000);
link->flags = flags;
if (transport_link_set_config(knet_h, link, transport) < 0) {
savederrno = errno;
err = -1;
goto exit_unlock;
}
/*
* we can only configure default access lists if we know both endpoints
* and the protocol uses GENERIC_ACL, otherwise the protocol has
* to setup their own access lists above in transport_link_set_config.
*/
if ((transport_get_acl_type(knet_h, transport) == USE_GENERIC_ACL) &&
(link->dynamic == KNET_LINK_STATIC)) {
log_debug(knet_h, KNET_SUB_LINK, "Configuring default access lists for host: %u link: %u socket: %d",
host_id, link_id, link->outsock);
if ((check_add(knet_h, link->outsock, transport, -1,
&link->dst_addr, &link->dst_addr,
CHECK_TYPE_ADDRESS, CHECK_ACCEPT) < 0) && (errno != EEXIST)) {
log_warn(knet_h, KNET_SUB_LINK, "Failed to configure default access lists for host: %u link: %u", host_id, link_id);
savederrno = errno;
err = -1;
goto exit_unlock;
}
}
link->configured = 1;
log_debug(knet_h, KNET_SUB_LINK, "host: %u link: %u is configured",
host_id, link_id);
if (transport == KNET_TRANSPORT_LOOPBACK) {
knet_h->has_loop_link = 1;
knet_h->loop_link = link_id;
host->status.reachable = 1;
link->status.mtu = KNET_PMTUD_SIZE_V6;
} else {
/*
* calculate the minimum MTU that is safe to use,
* based on RFCs and that each network device should
* be able to support without any troubles
*/
if (link->dynamic == KNET_LINK_STATIC) {
/*
* with static link we can be more precise than using
* the generic calc_min_mtu()
*/
switch (link->dst_addr.ss_family) {
case AF_INET6:
link->status.mtu = calc_max_data_outlen(knet_h, KNET_PMTUD_MIN_MTU_V6 - (KNET_PMTUD_OVERHEAD_V6 + link->proto_overhead));
break;
case AF_INET:
link->status.mtu = calc_max_data_outlen(knet_h, KNET_PMTUD_MIN_MTU_V4 - (KNET_PMTUD_OVERHEAD_V4 + link->proto_overhead));
break;
}
} else {
/*
* for dynamic links we start with the minimum MTU
* possible and PMTUd will kick in immediately
* after connection status is 1
*/
link->status.mtu = calc_min_mtu(knet_h);
}
link->has_valid_mtu = 1;
}
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_get_config(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t *transport,
struct sockaddr_storage *src_addr,
struct sockaddr_storage *dst_addr,
uint8_t *dynamic,
uint64_t *flags)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (!src_addr) {
errno = EINVAL;
return -1;
}
if (!dynamic) {
errno = EINVAL;
return -1;
}
if (!transport) {
errno = EINVAL;
return -1;
}
if (!flags) {
errno = EINVAL;
return -1;
}
savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get read lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
if ((link->dynamic == KNET_LINK_STATIC) && (!dst_addr)) {
savederrno = EINVAL;
err = -1;
goto exit_unlock;
}
memmove(src_addr, &link->src_addr, sizeof(struct sockaddr_storage));
*transport = link->transport;
*flags = link->flags;
if (link->dynamic == KNET_LINK_STATIC) {
*dynamic = 0;
memmove(dst_addr, &link->dst_addr, sizeof(struct sockaddr_storage));
} else {
*dynamic = 1;
}
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_clear_config(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
int sock;
uint8_t transport;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
savederrno = get_global_wrlock(knet_h);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get write lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (link->configured != 1) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
if (link->status.enabled != 0) {
err = -1;
savederrno = EBUSY;
log_err(knet_h, KNET_SUB_LINK, "Host %u link %u is currently in use: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
/*
* remove well known access lists here.
* After the transport has done clearing the config,
* then we can remove any leftover access lists if the link
* is no longer in use.
*/
if ((transport_get_acl_type(knet_h, link->transport) == USE_GENERIC_ACL) &&
(link->dynamic == KNET_LINK_STATIC)) {
if ((check_rm(knet_h, link->outsock, link->transport,
&link->dst_addr, &link->dst_addr,
CHECK_TYPE_ADDRESS, CHECK_ACCEPT) < 0) && (errno != ENOENT)) {
err = -1;
savederrno = errno;
log_err(knet_h, KNET_SUB_LINK, "Host %u link %u: unable to remove default access list",
host_id, link_id);
goto exit_unlock;
}
}
/*
* cache it for later as we don't know if the transport
* will clear link info during clear_config.
*/
sock = link->outsock;
transport = link->transport;
if ((transport_link_clear_config(knet_h, link) < 0) &&
(errno != EBUSY)) {
savederrno = errno;
err = -1;
goto exit_unlock;
}
/*
* remove any other access lists when the socket is no
* longer in use by the transport.
*/
if ((transport_get_acl_type(knet_h, link->transport) == USE_GENERIC_ACL) &&
(knet_h->knet_transport_fd_tracker[sock].transport == KNET_MAX_TRANSPORTS)) {
check_rmall(knet_h, sock, transport);
}
memset(link, 0, sizeof(struct knet_link));
link->link_id = link_id;
if (knet_h->has_loop_link && host_id == knet_h->host_id && link_id == knet_h->loop_link) {
knet_h->has_loop_link = 0;
if (host->active_link_entries == 0) {
host->status.reachable = 0;
}
}
log_debug(knet_h, KNET_SUB_LINK, "host: %u link: %u config has been wiped",
host_id, link_id);
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_set_enable(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
unsigned int enabled)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (enabled > 1) {
errno = EINVAL;
return -1;
}
savederrno = get_global_wrlock(knet_h);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get read lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
if (link->status.enabled == enabled) {
err = 0;
goto exit_unlock;
}
err = _link_updown(knet_h, host_id, link_id, enabled, link->status.connected);
savederrno = errno;
if (enabled) {
goto exit_unlock;
}
log_debug(knet_h, KNET_SUB_LINK, "host: %u link: %u is disabled",
host_id, link_id);
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_get_enable(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
unsigned int *enabled)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (!enabled) {
errno = EINVAL;
return -1;
}
savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get read lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
*enabled = link->status.enabled;
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_set_pong_count(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t pong_count)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (pong_count < 1) {
errno = EINVAL;
return -1;
}
savederrno = get_global_wrlock(knet_h);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get write lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
link->pong_count = pong_count;
log_debug(knet_h, KNET_SUB_LINK,
"host: %u link: %u pong count update: %u",
host_id, link_id, link->pong_count);
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_get_pong_count(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t *pong_count)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (!pong_count) {
errno = EINVAL;
return -1;
}
savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get read lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
*pong_count = link->pong_count;
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_set_ping_timers(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
time_t interval, time_t timeout, unsigned int precision)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (!interval) {
errno = EINVAL;
return -1;
}
if (!timeout) {
errno = ENOSYS;
return -1;
}
if (!precision) {
errno = EINVAL;
return -1;
}
savederrno = get_global_wrlock(knet_h);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get write lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
link->ping_interval = interval * 1000; /* microseconds */
link->pong_timeout = timeout * 1000; /* microseconds */
link->latency_fix = precision;
link->latency_exp = precision - \
((link->ping_interval * precision) / 8000000);
log_debug(knet_h, KNET_SUB_LINK,
"host: %u link: %u timeout update - interval: %llu timeout: %llu precision: %u",
host_id, link_id, link->ping_interval, link->pong_timeout, precision);
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_get_ping_timers(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
time_t *interval, time_t *timeout, unsigned int *precision)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
if (!interval) {
errno = EINVAL;
return -1;
}
if (!timeout) {
errno = EINVAL;
return -1;
}
if (!precision) {
errno = EINVAL;
return -1;
}
savederrno = pthread_rwlock_rdlock(&knet_h->global_rwlock);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get read lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
*interval = link->ping_interval / 1000; /* microseconds */
*timeout = link->pong_timeout / 1000;
*precision = link->latency_fix;
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_set_priority(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t priority)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
uint8_t old_priority;
if (!knet_h) {
errno = EINVAL;
return -1;
}
if (link_id >= KNET_MAX_LINK) {
errno = EINVAL;
return -1;
}
savederrno = get_global_wrlock(knet_h);
if (savederrno) {
log_err(knet_h, KNET_SUB_LINK, "Unable to get write lock: %s",
strerror(savederrno));
errno = savederrno;
return -1;
}
host = knet_h->host_index[host_id];
if (!host) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "Unable to find host %u: %s",
host_id, strerror(savederrno));
goto exit_unlock;
}
link = &host->link[link_id];
if (!link->configured) {
err = -1;
savederrno = EINVAL;
log_err(knet_h, KNET_SUB_LINK, "host %u link %u is not configured: %s",
host_id, link_id, strerror(savederrno));
goto exit_unlock;
}
old_priority = link->priority;
if (link->priority == priority) {
err = 0;
goto exit_unlock;
}
link->priority = priority;
if (_host_dstcache_update_sync(knet_h, host)) {
savederrno = errno;
log_debug(knet_h, KNET_SUB_LINK,
"Unable to update link priority (host: %u link: %u priority: %u): %s",
host_id, link_id, link->priority, strerror(savederrno));
link->priority = old_priority;
err = -1;
goto exit_unlock;
}
log_debug(knet_h, KNET_SUB_LINK,
"host: %u link: %u priority set to: %u",
host_id, link_id, link->priority);
exit_unlock:
pthread_rwlock_unlock(&knet_h->global_rwlock);
errno = err ? savederrno : 0;
return err;
}
int knet_link_get_priority(knet_handle_t knet_h, knet_node_id_t host_id, uint8_t link_id,
uint8_t *priority)
{
int savederrno = 0, err = 0;
struct knet_host *host;
struct knet_link *link;
if (!knet_h) {
errno = EINVAL;