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btl_tcp_endpoint.c
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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2020 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* Copyright (c) 2007-2008 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2013-2022 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2014 Intel, Inc. All rights reserved.
* Copyright (c) 2015 Research Organization for Information Science
* and Technology (RIST). All rights reserved.
* Copyright (c) 2018-2020 Amazon.com, Inc. or its affiliates. All Rights reserved.
* Copyright (c) 2020 Google, LLC. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*
*/
#include "opal_config.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "opal/opal_socket_errno.h"
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETINET_TCP_H
# include <netinet/tcp.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif /* HAVE_SYS_TIME_H */
#include <time.h>
#include "opal/mca/btl/base/btl_base_error.h"
#include "opal/util/event.h"
#include "opal/util/net.h"
#include "opal/util/printf.h"
#include "opal/util/proc.h"
#include "opal/util/show_help.h"
#include "opal/util/string_copy.h"
#include "btl_tcp.h"
#include "btl_tcp_addr.h"
#include "btl_tcp_endpoint.h"
#include "btl_tcp_frag.h"
#include "btl_tcp_proc.h"
/*
* Magic ID string send during connect/accept handshake
*/
const char mca_btl_tcp_magic_id_string[MCA_BTL_TCP_MAGIC_STRING_LENGTH] = "OPAL-TCP-BTL";
/*
* Initialize state of the endpoint instance.
*
*/
static void mca_btl_tcp_endpoint_construct(mca_btl_tcp_endpoint_t *endpoint)
{
endpoint->endpoint_btl = NULL;
endpoint->endpoint_proc = NULL;
endpoint->endpoint_addr = NULL;
endpoint->endpoint_sd = -1;
endpoint->endpoint_sd_next = -1;
endpoint->endpoint_send_frag = 0;
endpoint->endpoint_recv_frag = 0;
endpoint->endpoint_state = MCA_BTL_TCP_CLOSED;
endpoint->endpoint_retries = 0;
endpoint->endpoint_nbo = false;
#if MCA_BTL_TCP_ENDPOINT_CACHE
endpoint->endpoint_cache = NULL;
endpoint->endpoint_cache_pos = NULL;
endpoint->endpoint_cache_length = 0;
#endif /* MCA_BTL_TCP_ENDPOINT_CACHE */
OBJ_CONSTRUCT(&endpoint->endpoint_frags, opal_list_t);
OBJ_CONSTRUCT(&endpoint->endpoint_send_lock, opal_mutex_t);
OBJ_CONSTRUCT(&endpoint->endpoint_recv_lock, opal_mutex_t);
}
/*
* Destroy a endpoint
*
*/
static void mca_btl_tcp_endpoint_destruct(mca_btl_tcp_endpoint_t *endpoint)
{
mca_btl_tcp_endpoint_close(endpoint);
mca_btl_tcp_proc_remove(endpoint->endpoint_proc, endpoint);
OBJ_DESTRUCT(&endpoint->endpoint_frags);
OBJ_DESTRUCT(&endpoint->endpoint_send_lock);
OBJ_DESTRUCT(&endpoint->endpoint_recv_lock);
}
OBJ_CLASS_INSTANCE(mca_btl_tcp_endpoint_t, opal_list_item_t, mca_btl_tcp_endpoint_construct,
mca_btl_tcp_endpoint_destruct);
static void mca_btl_tcp_endpoint_construct(mca_btl_base_endpoint_t *btl_endpoint);
static void mca_btl_tcp_endpoint_destruct(mca_btl_base_endpoint_t *btl_endpoint);
static int mca_btl_tcp_endpoint_start_connect(mca_btl_base_endpoint_t *);
static void mca_btl_tcp_endpoint_connected(mca_btl_base_endpoint_t *);
static void mca_btl_tcp_endpoint_recv_handler(int sd, short flags, void *user);
static void mca_btl_tcp_endpoint_send_handler(int sd, short flags, void *user);
/*
* diagnostics
*/
#if OPAL_ENABLE_DEBUG && WANT_PEER_DUMP
# define DEBUG_LENGTH 1024
/**
* The lack of protection in the mca_btl_tcp_endpoint_dump function is voluntary
* so that it can be called regardless of the state of the mutexes. As a result,
* when multiple threads work on the same endpoint not only the information
* displayed might be inaccurate, but when we manipulate the pending fragments we
* might access freed memory. Thus, the caller should lock the endpoint prior
* to the call.
*/
void mca_btl_tcp_endpoint_dump(int level, const char *fname, int lineno, const char *funcname,
mca_btl_base_endpoint_t *btl_endpoint, bool full_info,
const char *msg)
{
char outmsg[DEBUG_LENGTH];
int sndbuf, rcvbuf, nodelay, flags, used = 0;
# if OPAL_ENABLE_IPV6
struct sockaddr_storage inaddr;
# else
struct sockaddr_in inaddr;
# endif
opal_socklen_t obtlen;
opal_socklen_t addrlen = sizeof(inaddr);
mca_btl_tcp_frag_t *item;
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, "%s: ", msg);
if (used >= DEBUG_LENGTH)
goto out;
getsockname(btl_endpoint->endpoint_sd, (struct sockaddr *) &inaddr, &addrlen);
# if OPAL_ENABLE_IPV6
{
char *address;
address = (char *) opal_net_get_hostname((struct sockaddr *) &inaddr);
if (NULL != address) {
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, "%s -", address);
if (used >= DEBUG_LENGTH)
goto out;
}
}
# else
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, "%s -", inet_ntoa(inaddr.sin_addr));
if (used >= DEBUG_LENGTH)
goto out;
# endif
getpeername(btl_endpoint->endpoint_sd, (struct sockaddr *) &inaddr, &addrlen);
# if OPAL_ENABLE_IPV6
{
char *address;
address = (char *) opal_net_get_hostname((struct sockaddr *) &inaddr);
if (NULL != address) {
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, " %s", address);
if (used >= DEBUG_LENGTH)
goto out;
}
}
# else
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, " %s", inet_ntoa(inaddr.sin_addr));
if (used >= DEBUG_LENGTH)
goto out;
# endif
used = snprintf(outmsg, DEBUG_LENGTH, "[%d", btl_endpoint->endpoint_sd);
if (used >= DEBUG_LENGTH)
goto out;
switch (btl_endpoint->endpoint_state) {
case MCA_BTL_TCP_CONNECTING:
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, ":%s]", "connecting");
if (used >= DEBUG_LENGTH)
goto out;
break;
case MCA_BTL_TCP_CONNECT_ACK:
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, ":%s]", "ack");
if (used >= DEBUG_LENGTH)
goto out;
break;
case MCA_BTL_TCP_CLOSED:
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, ":%s]", "close");
if (used >= DEBUG_LENGTH)
goto out;
break;
case MCA_BTL_TCP_FAILED:
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, ":%s]", "failed");
if (used >= DEBUG_LENGTH)
goto out;
break;
case MCA_BTL_TCP_CONNECTED:
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, ":%s]", "connected");
if (used >= DEBUG_LENGTH)
goto out;
break;
default:
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, ":%s]", "unknown");
if (used >= DEBUG_LENGTH)
goto out;
break;
}
if (full_info) {
if ((flags = fcntl(btl_endpoint->endpoint_sd, F_GETFL, 0)) < 0) {
BTL_ERROR(
("fcntl(F_GETFL) failed: %s (%d)", strerror(opal_socket_errno), opal_socket_errno));
}
# if defined(SO_SNDBUF)
obtlen = sizeof(sndbuf);
if (getsockopt(btl_endpoint->endpoint_sd, SOL_SOCKET, SO_SNDBUF, (char *) &sndbuf, &obtlen)
< 0) {
BTL_ERROR(
("SO_SNDBUF option: %s (%d)", strerror(opal_socket_errno), opal_socket_errno));
}
# else
sndbuf = -1;
# endif
# if defined(SO_RCVBUF)
obtlen = sizeof(rcvbuf);
if (getsockopt(btl_endpoint->endpoint_sd, SOL_SOCKET, SO_RCVBUF, (char *) &rcvbuf, &obtlen)
< 0) {
BTL_ERROR(
("SO_RCVBUF option: %s (%d)", strerror(opal_socket_errno), opal_socket_errno));
}
# else
rcvbuf = -1;
# endif
# if defined(TCP_NODELAY)
obtlen = sizeof(nodelay);
if (getsockopt(btl_endpoint->endpoint_sd, IPPROTO_TCP, TCP_NODELAY, (char *) &nodelay,
&obtlen)
< 0) {
BTL_ERROR(
("TCP_NODELAY option: %s (%d)", strerror(opal_socket_errno), opal_socket_errno));
}
# else
nodelay = 0;
# endif
used += snprintf(&outmsg[used], DEBUG_LENGTH - used,
" nodelay %d sndbuf %d rcvbuf %d flags %08x", nodelay, sndbuf, rcvbuf,
flags);
if (used >= DEBUG_LENGTH)
goto out;
# if MCA_BTL_TCP_ENDPOINT_CACHE
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, "\n\t[cache %p used %lu/%lu]",
(void *) btl_endpoint->endpoint_cache,
btl_endpoint->endpoint_cache_pos - btl_endpoint->endpoint_cache,
btl_endpoint->endpoint_cache_length);
if (used >= DEBUG_LENGTH)
goto out;
# endif /* MCA_BTL_TCP_ENDPOINT_CACHE */
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, "{%s - retries %d}",
(btl_endpoint->endpoint_nbo ? "NBO" : ""),
(int) btl_endpoint->endpoint_retries);
if (used >= DEBUG_LENGTH)
goto out;
}
used += snprintf(&outmsg[used], DEBUG_LENGTH - used, "\n");
if (used >= DEBUG_LENGTH)
goto out;
if (NULL != btl_endpoint->endpoint_recv_frag)
used += mca_btl_tcp_frag_dump(btl_endpoint->endpoint_recv_frag, "active recv",
&outmsg[used], DEBUG_LENGTH - used);
if (used >= DEBUG_LENGTH)
goto out;
if (NULL != btl_endpoint->endpoint_send_frag)
used += mca_btl_tcp_frag_dump(btl_endpoint->endpoint_send_frag,
"active send (inaccurate iov)", &outmsg[used],
DEBUG_LENGTH - used);
if (used >= DEBUG_LENGTH)
goto out;
OPAL_LIST_FOREACH (item, &btl_endpoint->endpoint_frags, mca_btl_tcp_frag_t) {
used += mca_btl_tcp_frag_dump(item, "pending send", &outmsg[used], DEBUG_LENGTH - used);
if (used >= DEBUG_LENGTH)
goto out;
}
out:
outmsg[used >= DEBUG_LENGTH ? (DEBUG_LENGTH - 1) : used] = '\0';
opal_output_verbose(level, opal_btl_base_framework.framework_output, "[%s:%d:%s][%s -> %s] %s",
fname, lineno, funcname, OPAL_NAME_PRINT(opal_proc_local_get()->proc_name),
(NULL != btl_endpoint->endpoint_proc
? OPAL_NAME_PRINT(btl_endpoint->endpoint_proc->proc_opal->proc_name)
: "unknown remote"),
outmsg);
}
#endif /* OPAL_ENABLE_DEBUG && WANT_PEER_DUMP */
/*
* Initialize events to be used by the endpoint instance for TCP select/poll callbacks.
*/
static inline void mca_btl_tcp_endpoint_event_init(mca_btl_base_endpoint_t *btl_endpoint)
{
#if MCA_BTL_TCP_ENDPOINT_CACHE
assert(NULL == btl_endpoint->endpoint_cache);
btl_endpoint->endpoint_cache = (char *) malloc(mca_btl_tcp_component.tcp_endpoint_cache);
btl_endpoint->endpoint_cache_pos = btl_endpoint->endpoint_cache;
#endif /* MCA_BTL_TCP_ENDPOINT_CACHE */
opal_event_set(mca_btl_tcp_event_base, &btl_endpoint->endpoint_recv_event,
btl_endpoint->endpoint_sd, OPAL_EV_READ | OPAL_EV_PERSIST,
mca_btl_tcp_endpoint_recv_handler, btl_endpoint);
/**
* In the multi-threaded case, the send event must be persistent in order
* to avoid missing the connection notification in send_handler due to
* a local handling of the peer process (which holds the lock).
*/
opal_event_set(mca_btl_tcp_event_base, &btl_endpoint->endpoint_send_event,
btl_endpoint->endpoint_sd, OPAL_EV_WRITE | OPAL_EV_PERSIST,
mca_btl_tcp_endpoint_send_handler, btl_endpoint);
}
/*
* Attempt to send a fragment using a given endpoint. If the endpoint is not connected,
* queue the fragment and start the connection as required.
*/
int mca_btl_tcp_endpoint_send(mca_btl_base_endpoint_t *btl_endpoint, mca_btl_tcp_frag_t *frag)
{
int rc = OPAL_SUCCESS;
OPAL_THREAD_LOCK(&btl_endpoint->endpoint_send_lock);
switch (btl_endpoint->endpoint_state) {
case MCA_BTL_TCP_CONNECTING:
case MCA_BTL_TCP_CONNECT_ACK:
case MCA_BTL_TCP_CLOSED:
opal_list_append(&btl_endpoint->endpoint_frags, (opal_list_item_t *) frag);
frag->base.des_flags |= MCA_BTL_DES_SEND_ALWAYS_CALLBACK;
if (btl_endpoint->endpoint_state == MCA_BTL_TCP_CLOSED) {
rc = mca_btl_tcp_endpoint_start_connect(btl_endpoint);
}
break;
case MCA_BTL_TCP_FAILED:
rc = OPAL_ERR_UNREACH;
break;
case MCA_BTL_TCP_CONNECTED:
if (NULL == btl_endpoint->endpoint_send_frag) {
if (frag->base.des_flags & MCA_BTL_DES_FLAGS_PRIORITY
&& mca_btl_tcp_frag_send(frag, btl_endpoint->endpoint_sd)) {
int btl_ownership = (frag->base.des_flags & MCA_BTL_DES_FLAGS_BTL_OWNERSHIP);
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_send_lock);
if (frag->base.des_flags & MCA_BTL_DES_SEND_ALWAYS_CALLBACK) {
frag->base.des_cbfunc(&frag->btl->super, frag->endpoint, &frag->base, frag->rc);
}
if (btl_ownership) {
MCA_BTL_TCP_FRAG_RETURN(frag);
}
MCA_BTL_TCP_ENDPOINT_DUMP(50, btl_endpoint, true,
"complete send fragment [endpoint_send]");
return 1;
} else {
btl_endpoint->endpoint_send_frag = frag;
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true,
"event_add(send) [endpoint_send]");
frag->base.des_flags |= MCA_BTL_DES_SEND_ALWAYS_CALLBACK;
MCA_BTL_TCP_ACTIVATE_EVENT(&btl_endpoint->endpoint_send_event, 0);
}
} else {
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true,
"send fragment enqueued [endpoint_send]");
frag->base.des_flags |= MCA_BTL_DES_SEND_ALWAYS_CALLBACK;
opal_list_append(&btl_endpoint->endpoint_frags, (opal_list_item_t *) frag);
}
break;
}
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_send_lock);
return rc;
}
/*
* A blocking send on a non-blocking socket. Used to send the small
* amount of connection information that identifies the endpoints endpoint.
*/
static int mca_btl_tcp_endpoint_send_blocking(mca_btl_base_endpoint_t *btl_endpoint,
const void *data, size_t size)
{
int ret = mca_btl_tcp_send_blocking(btl_endpoint->endpoint_sd, data, size);
if (ret < 0) {
/* send-lock not needed because never called when the socket is in the
* event set. */
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
}
return ret;
}
/*
* Send the globally unique identifier for this process to a endpoint on
* a newly connected socket.
*/
static int mca_btl_tcp_endpoint_send_connect_ack(mca_btl_base_endpoint_t *btl_endpoint)
{
opal_process_name_t guid = opal_proc_local_get()->proc_name;
OPAL_PROCESS_NAME_HTON(guid);
mca_btl_tcp_endpoint_hs_msg_t hs_msg;
opal_string_copy(hs_msg.magic_id, mca_btl_tcp_magic_id_string, sizeof(hs_msg.magic_id));
hs_msg.guid = guid;
if (sizeof(hs_msg)
!= mca_btl_tcp_endpoint_send_blocking(btl_endpoint, &hs_msg, sizeof(hs_msg))) {
opal_show_help("help-mpi-btl-tcp.txt", "client handshake fail", true,
opal_process_info.nodename, sizeof(hs_msg),
"connect ACK failed to send magic-id and guid");
return OPAL_ERR_UNREACH;
}
return OPAL_SUCCESS;
}
static void *mca_btl_tcp_endpoint_complete_accept(int fd, int flags, void *context)
{
mca_btl_base_endpoint_t *btl_endpoint = (mca_btl_base_endpoint_t *) context;
struct timeval now = {0, 0};
int cmpval;
if (OPAL_THREAD_TRYLOCK(&btl_endpoint->endpoint_recv_lock)) {
opal_event_add(&btl_endpoint->endpoint_accept_event, &now);
return NULL;
}
if (OPAL_THREAD_TRYLOCK(&btl_endpoint->endpoint_send_lock)) {
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_recv_lock);
opal_event_add(&btl_endpoint->endpoint_accept_event, &now);
return NULL;
}
if (NULL == btl_endpoint->endpoint_addr) {
CLOSE_THE_SOCKET(
btl_endpoint->endpoint_sd_next); /* No further use of this socket. Close it */
btl_endpoint->endpoint_sd_next = -1;
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_send_lock);
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_recv_lock);
if (NULL != btl_endpoint->endpoint_btl->tcp_error_cb) {
btl_endpoint->endpoint_btl
->tcp_error_cb(&btl_endpoint->endpoint_btl->super, MCA_BTL_ERROR_FLAGS_NONFATAL,
btl_endpoint->endpoint_proc->proc_opal,
"The endpoint addr is set to NULL (unsettling)");
}
return NULL;
}
cmpval = opal_compare_proc(btl_endpoint->endpoint_proc->proc_opal->proc_name,
opal_proc_local_get()->proc_name);
if ((btl_endpoint->endpoint_sd < 0)
|| (btl_endpoint->endpoint_state != MCA_BTL_TCP_CONNECTED && cmpval < 0)) {
mca_btl_tcp_endpoint_close(btl_endpoint);
btl_endpoint->endpoint_sd = btl_endpoint->endpoint_sd_next;
btl_endpoint->endpoint_sd_next = -1;
if (mca_btl_tcp_endpoint_send_connect_ack(btl_endpoint) != OPAL_SUCCESS) {
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, true, " [endpoint_accept]");
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
goto unlock_and_return;
}
mca_btl_tcp_endpoint_event_init(btl_endpoint);
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true, "event_add(recv) [endpoint_accept]");
opal_event_add(&btl_endpoint->endpoint_recv_event, 0);
if (mca_btl_tcp_event_base == opal_sync_event_base) {
/* If no progress thread then raise the awarness of the default progress engine */
opal_progress_event_users_increment();
}
mca_btl_tcp_endpoint_connected(btl_endpoint);
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true, "accepted");
goto unlock_and_return;
}
CLOSE_THE_SOCKET(btl_endpoint->endpoint_sd_next); /* No further use of this socket. Close it */
btl_endpoint->endpoint_sd_next = -1;
unlock_and_return:
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_send_lock);
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_recv_lock);
return NULL;
}
/*
* Check the state of this endpoint. If the incoming connection request matches
* our endpoints address, check the state of our connection:
* (1) if a connection has not been attempted, accept the connection
* (2) if a connection has not been established, and the endpoints process identifier
* is less than the local process, accept the connection
* otherwise, reject the connection and continue with the current connection
*/
void mca_btl_tcp_endpoint_accept(mca_btl_base_endpoint_t *btl_endpoint, struct sockaddr *addr,
int sd)
{
struct timeval now = {0, 0};
assert(btl_endpoint->endpoint_sd_next == -1);
btl_endpoint->endpoint_sd_next = sd;
opal_event_evtimer_set(mca_btl_tcp_event_base, &btl_endpoint->endpoint_accept_event,
mca_btl_tcp_endpoint_complete_accept, btl_endpoint);
opal_event_add(&btl_endpoint->endpoint_accept_event, &now);
}
/*
* Remove any event registrations associated with the socket
* and update the endpoint state to reflect the connection has
* been closed.
*/
void mca_btl_tcp_endpoint_close(mca_btl_base_endpoint_t *btl_endpoint)
{
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, false, "[close]");
if (btl_endpoint->endpoint_sd < 0) {
return;
}
btl_endpoint->endpoint_retries++;
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, false, "event_del(recv) [close]");
opal_event_del(&btl_endpoint->endpoint_recv_event);
if (mca_btl_tcp_event_base == opal_sync_event_base) {
/* If no progress thread then lower the awarness of the default progress engine */
opal_progress_event_users_decrement();
}
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, false, "event_del(send) [close]");
opal_event_del(&btl_endpoint->endpoint_send_event);
#if MCA_BTL_TCP_ENDPOINT_CACHE
free(btl_endpoint->endpoint_cache);
btl_endpoint->endpoint_cache = NULL;
btl_endpoint->endpoint_cache_pos = NULL;
btl_endpoint->endpoint_cache_length = 0;
#endif /* MCA_BTL_TCP_ENDPOINT_CACHE */
/* send a message before closing to differentiate between failures and
* clean disconnect during finalize */
if (MCA_BTL_TCP_CONNECTED == btl_endpoint->endpoint_state) {
mca_btl_tcp_hdr_t fin_msg = {
.base.tag = 0,
.type = MCA_BTL_TCP_HDR_TYPE_FIN,
.count = 0,
.size = 0,
};
mca_btl_tcp_endpoint_send_blocking(btl_endpoint, &fin_msg, sizeof(fin_msg));
}
CLOSE_THE_SOCKET(btl_endpoint->endpoint_sd);
btl_endpoint->endpoint_sd = -1;
/**
* If we keep failing to connect to the peer let the caller know about
* this situation by triggering the callback on all pending fragments and
* reporting the error. The upper layer has then the opportunity to
* re-route or re-schedule the fragments.
*/
if (MCA_BTL_TCP_FAILED == btl_endpoint->endpoint_state) {
mca_btl_tcp_frag_t *frag = btl_endpoint->endpoint_send_frag;
if (NULL == frag) {
frag = (mca_btl_tcp_frag_t *) opal_list_remove_first(&btl_endpoint->endpoint_frags);
}
while (NULL != frag) {
frag->base.des_cbfunc(&frag->btl->super, frag->endpoint, &frag->base, OPAL_ERR_UNREACH);
if (frag->base.des_flags & MCA_BTL_DES_FLAGS_BTL_OWNERSHIP) {
MCA_BTL_TCP_FRAG_RETURN(frag);
}
frag = (mca_btl_tcp_frag_t *) opal_list_remove_first(&btl_endpoint->endpoint_frags);
}
btl_endpoint->endpoint_send_frag = NULL;
/* Let's report the error upstream */
if (NULL != btl_endpoint->endpoint_btl->tcp_error_cb) {
btl_endpoint->endpoint_btl
->tcp_error_cb((mca_btl_base_module_t *) btl_endpoint->endpoint_btl, 0,
btl_endpoint->endpoint_proc->proc_opal, "Socket closed");
}
} else {
btl_endpoint->endpoint_state = MCA_BTL_TCP_CLOSED;
}
}
/*
* Setup endpoint state to reflect that connection has been established,
* and start any pending sends. This function should be called with the
* send lock locked.
*/
static void mca_btl_tcp_endpoint_connected(mca_btl_base_endpoint_t *btl_endpoint)
{
/* setup socket options */
assert(MCA_BTL_TCP_CONNECTED != btl_endpoint->endpoint_state);
btl_endpoint->endpoint_state = MCA_BTL_TCP_CONNECTED;
btl_endpoint->endpoint_retries = 0;
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, true, "READY [endpoint_connected]");
if (opal_list_get_size(&btl_endpoint->endpoint_frags) > 0) {
if (NULL == btl_endpoint->endpoint_send_frag) {
btl_endpoint->endpoint_send_frag = (mca_btl_tcp_frag_t *) opal_list_remove_first(
&btl_endpoint->endpoint_frags);
}
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true, "event_add(send) [endpoint_connected]");
opal_event_add(&btl_endpoint->endpoint_send_event, 0);
}
}
/*
* Receive the endpoints globally unique process identification from a newly
* connected socket and verify the expected response. If so, move the
* socket to a connected state.
*
* NOTE: The return codes from this function are checked in
* mca_btl_tcp_endpoint_recv_handler(). Don't change them here
* without also changing the handling in _recv_handler()!
*/
static int mca_btl_tcp_endpoint_recv_connect_ack(mca_btl_base_endpoint_t *btl_endpoint)
{
size_t retval, len = strlen(mca_btl_tcp_magic_id_string);
mca_btl_tcp_proc_t *btl_proc = btl_endpoint->endpoint_proc;
opal_process_name_t guid;
mca_btl_tcp_endpoint_hs_msg_t hs_msg;
retval = mca_btl_tcp_recv_blocking(btl_endpoint->endpoint_sd, &hs_msg, sizeof(hs_msg));
if (sizeof(hs_msg) != retval) {
mca_btl_tcp_endpoint_close(btl_endpoint);
if (0 == retval) {
/* If we get zero bytes, the peer closed the socket. This
can happen when the two peers started the connection
protocol simultaneously. Just report the problem
upstream. */
return OPAL_ERROR;
}
opal_show_help("help-mpi-btl-tcp.txt", "client handshake fail", true,
opal_process_info.nodename, getpid(),
"did not receive entire connect ACK from peer");
return OPAL_ERR_BAD_PARAM;
}
if (0 != strncmp(hs_msg.magic_id, mca_btl_tcp_magic_id_string, len)) {
opal_show_help("help-mpi-btl-tcp.txt", "server did not receive magic string", true,
opal_process_info.nodename, getpid(), "client", hs_msg.magic_id,
"string value");
return OPAL_ERR_BAD_PARAM;
}
guid = hs_msg.guid;
OPAL_PROCESS_NAME_NTOH(guid);
/* compare this to the expected values */
/* TODO: this deserve a little bit more thinking as we are not supposed
* to be able to exchange the opal_process_name_t over the network.
*/
if (0 != opal_compare_proc(btl_proc->proc_opal->proc_name, guid)) {
BTL_ERROR(("received unexpected process identifier: got %s expected %s",
OPAL_NAME_PRINT(guid), OPAL_NAME_PRINT(btl_proc->proc_opal->proc_name)));
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
return OPAL_ERR_UNREACH;
}
return OPAL_SUCCESS;
}
void mca_btl_tcp_set_socket_options(int sd)
{
#if defined(TCP_NODELAY)
int optval;
optval = !mca_btl_tcp_component.tcp_not_use_nodelay;
if (setsockopt(sd, IPPROTO_TCP, TCP_NODELAY, (char *) &optval, sizeof(optval)) < 0) {
BTL_ERROR(("setsockopt(TCP_NODELAY) failed: %s (%d)", strerror(opal_socket_errno),
opal_socket_errno));
}
#endif
#if defined(SO_SNDBUF)
if (mca_btl_tcp_component.tcp_sndbuf > 0
&& setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (char *) &mca_btl_tcp_component.tcp_sndbuf,
sizeof(int))
< 0) {
BTL_ERROR(("setsockopt(SO_SNDBUF) failed: %s (%d)", strerror(opal_socket_errno),
opal_socket_errno));
}
#endif
#if defined(SO_RCVBUF)
if (mca_btl_tcp_component.tcp_rcvbuf > 0
&& setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (char *) &mca_btl_tcp_component.tcp_rcvbuf,
sizeof(int))
< 0) {
BTL_ERROR(("setsockopt(SO_RCVBUF) failed: %s (%d)", strerror(opal_socket_errno),
opal_socket_errno));
}
#endif
#if defined(SO_NOSIGPIPE)
/* Some BSD flavors generate EPIPE when we write to a disconnected peer. We need
* the prevent this signal to be able to trap socket shutdown and cleanly release
* the endpoint.
*/
int optval2 = 1;
if (setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, (char *) &optval2, sizeof(optval2)) < 0) {
BTL_ERROR(("setsockopt(SO_NOSIGPIPE) failed: %s (%d)", strerror(opal_socket_errno),
opal_socket_errno));
}
#endif
}
/*
* Start a connection to the endpoint. This will likely not complete,
* as the socket is set to non-blocking, so register for event
* notification of connect completion. On connection we send our
* globally unique process identifier to the endpoint and wait for
* the endpoint response.
*/
static int mca_btl_tcp_endpoint_start_connect(mca_btl_base_endpoint_t *btl_endpoint)
{
int rc, flags;
struct sockaddr_storage endpoint_addr;
/* By default consider a IPv4 connection */
uint16_t af_family = AF_INET;
opal_socklen_t addrlen = sizeof(struct sockaddr_in);
#if OPAL_ENABLE_IPV6
if (AF_INET6 == btl_endpoint->endpoint_addr->addr_family) {
af_family = AF_INET6;
addrlen = sizeof(struct sockaddr_in6);
}
#endif
assert(btl_endpoint->endpoint_sd < 0);
btl_endpoint->endpoint_sd = socket(af_family, SOCK_STREAM, 0);
if (btl_endpoint->endpoint_sd < 0) {
btl_endpoint->endpoint_retries++;
return OPAL_ERR_UNREACH;
}
/* setup socket buffer sizes */
mca_btl_tcp_set_socket_options(btl_endpoint->endpoint_sd);
/* setup event callbacks */
mca_btl_tcp_endpoint_event_init(btl_endpoint);
/* setup the socket as non-blocking */
if ((flags = fcntl(btl_endpoint->endpoint_sd, F_GETFL, 0)) < 0) {
opal_show_help("help-mpi-btl-tcp.txt", "socket flag fail", true, opal_process_info.nodename,
getpid(), "fcntl(sd, F_GETFL, 0)", strerror(opal_socket_errno),
opal_socket_errno);
/* Upper layer will handler the error */
return OPAL_ERR_UNREACH;
} else {
flags |= O_NONBLOCK;
if (fcntl(btl_endpoint->endpoint_sd, F_SETFL, flags) < 0) {
opal_show_help("help-mpi-btl-tcp.txt", "socket flag fail", true,
opal_process_info.nodename, getpid(),
"fcntl(sd, F_SETFL, flags & O_NONBLOCK)", strerror(opal_socket_errno),
opal_socket_errno);
/* Upper layer will handler the error */
return OPAL_ERR_UNREACH;
}
}
/* start the connect - will likely fail with EINPROGRESS */
mca_btl_tcp_proc_tosocks(btl_endpoint->endpoint_addr, &endpoint_addr);
/* Bind the socket to one of the addresses associated with
* this btl module. This sets the source IP to one of the
* addresses shared in modex, so that the destination rank
* can properly pair btl modules, even in cases where Linux
* might do something unexpected with routing */
if (endpoint_addr.ss_family == AF_INET) {
assert(NULL != &btl_endpoint->endpoint_btl->tcp_ifaddr);
if (bind(btl_endpoint->endpoint_sd,
(struct sockaddr *) &btl_endpoint->endpoint_btl->tcp_ifaddr,
sizeof(struct sockaddr_in))
< 0) {
BTL_ERROR(
("bind on local address (%s:%d) failed: %s (%d)",
opal_net_get_hostname((struct sockaddr *) &btl_endpoint->endpoint_btl->tcp_ifaddr),
htons(((struct sockaddr_in *) &btl_endpoint->endpoint_btl->tcp_ifaddr)->sin_port),
strerror(opal_socket_errno), opal_socket_errno));
CLOSE_THE_SOCKET(btl_endpoint->endpoint_sd);
return OPAL_ERROR;
}
}
#if OPAL_ENABLE_IPV6
if (endpoint_addr.ss_family == AF_INET6) {
assert(NULL != &btl_endpoint->endpoint_btl->tcp_ifaddr);
if (bind(btl_endpoint->endpoint_sd,
(struct sockaddr *) &btl_endpoint->endpoint_btl->tcp_ifaddr,
sizeof(struct sockaddr_in6))
< 0) {
BTL_ERROR(
("bind on local address (%s:%d) failed: %s (%d)",
opal_net_get_hostname((struct sockaddr *) &btl_endpoint->endpoint_btl->tcp_ifaddr),
htons(
((struct sockaddr_in6 *) &btl_endpoint->endpoint_btl->tcp_ifaddr)->sin6_port),
strerror(opal_socket_errno), opal_socket_errno));
CLOSE_THE_SOCKET(btl_endpoint->endpoint_sd);
return OPAL_ERROR;
}
}
#endif
opal_output_verbose(10, opal_btl_base_framework.framework_output,
"btl: tcp: attempting to connect() to %s address %s on port %d",
OPAL_NAME_PRINT(btl_endpoint->endpoint_proc->proc_opal->proc_name),
opal_net_get_hostname((struct sockaddr *) &endpoint_addr),
ntohs(btl_endpoint->endpoint_addr->addr_port));
if (0 == connect(btl_endpoint->endpoint_sd, (struct sockaddr *) &endpoint_addr, addrlen)) {
opal_output_verbose(10, opal_btl_base_framework.framework_output,
"btl:tcp: connect() to %s:%d completed",
opal_net_get_hostname((struct sockaddr *) &endpoint_addr),
ntohs(((struct sockaddr_in *) &endpoint_addr)->sin_port));
/* send our globally unique process identifier to the endpoint */
if ((rc = mca_btl_tcp_endpoint_send_connect_ack(btl_endpoint)) == OPAL_SUCCESS) {
btl_endpoint->endpoint_state = MCA_BTL_TCP_CONNECT_ACK;
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true, "event_add(recv) [start_connect]");
opal_event_add(&btl_endpoint->endpoint_recv_event, 0);
if (mca_btl_tcp_event_base == opal_sync_event_base) {
/* If no progress thread then raise the awarness of the default progress engine */
opal_progress_event_users_increment();
}
return OPAL_SUCCESS;
}
/* We connected to the peer, but he close the socket before we got a chance to send our guid
*/
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, true, "dropped connection [start_connect]");
} else {
/* non-blocking so wait for completion */
if (opal_socket_errno == EINPROGRESS || opal_socket_errno == EWOULDBLOCK) {
btl_endpoint->endpoint_state = MCA_BTL_TCP_CONNECTING;
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true, "event_add(send) [start_connect]");
MCA_BTL_TCP_ACTIVATE_EVENT(&btl_endpoint->endpoint_send_event, 0);
opal_output_verbose(30, opal_btl_base_framework.framework_output,
"btl:tcp: would block, so allowing background progress");
return OPAL_SUCCESS;
}
}
{
char *address;
address = opal_net_get_hostname((struct sockaddr *) &endpoint_addr);
BTL_PEER_ERROR(btl_endpoint->endpoint_proc->proc_opal,
("Unable to connect to the peer %s on port %d: %s\n", address,
ntohs(btl_endpoint->endpoint_addr->addr_port),
strerror(opal_socket_errno)));
}
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
return OPAL_ERR_UNREACH;
}
/*
* Check the status of the connection. If the connection failed, will retry
* later. Otherwise, send this processes identifier to the endpoint on the
* newly connected socket.
*/
static int mca_btl_tcp_endpoint_complete_connect(mca_btl_base_endpoint_t *btl_endpoint)
{
int so_error = 0;
opal_socklen_t so_length = sizeof(so_error);
struct sockaddr_storage endpoint_addr;
/* Delete the send event notification, as the next step is waiting for the ack
* from the peer. Once this ack is received we will deal with the send notification
* accordingly.
*/
opal_event_del(&btl_endpoint->endpoint_send_event);
mca_btl_tcp_proc_tosocks(btl_endpoint->endpoint_addr, &endpoint_addr);
/* check connect completion status */
if (getsockopt(btl_endpoint->endpoint_sd, SOL_SOCKET, SO_ERROR, (char *) &so_error, &so_length)
< 0) {
opal_show_help("help-mpi-btl-tcp.txt", "socket flag fail", true, opal_process_info.nodename,
getpid(), "fcntl(sd, F_GETFL, 0)", strerror(opal_socket_errno),
opal_socket_errno);
BTL_ERROR(("getsockopt() to %s:%d failed: %s (%d)",
opal_net_get_hostname((struct sockaddr *) &endpoint_addr),
((struct sockaddr_in *) &endpoint_addr)->sin_port, strerror(opal_socket_errno),
opal_socket_errno));
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
return OPAL_ERROR;
}
if (so_error == EINPROGRESS || so_error == EWOULDBLOCK) {
return OPAL_SUCCESS;
}
if (so_error != 0) {
if (mca_btl_base_warn_peer_error || mca_btl_base_verbose > 0) {
char *msg;
opal_asprintf(&msg, "connect() to %s:%d failed",
opal_net_get_hostname((struct sockaddr *) &endpoint_addr),
ntohs(((struct sockaddr_in *) &endpoint_addr)->sin_port));
opal_show_help("help-mpi-btl-tcp.txt", "client connect fail", true,
opal_process_info.nodename, getpid(), msg, strerror(so_error), so_error);
free(msg);
}
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
return OPAL_ERROR;
}
opal_output_verbose(
10, opal_btl_base_framework.framework_output,
"btl:tcp: connect() to %s:%d completed (complete_connect), sending connect ACK",
opal_net_get_hostname((struct sockaddr *) &endpoint_addr),
ntohs(((struct sockaddr_in *) &endpoint_addr)->sin_port));
if (mca_btl_tcp_endpoint_send_connect_ack(btl_endpoint) == OPAL_SUCCESS) {
btl_endpoint->endpoint_state = MCA_BTL_TCP_CONNECT_ACK;
opal_event_add(&btl_endpoint->endpoint_recv_event, 0);
if (mca_btl_tcp_event_base == opal_sync_event_base) {
/* If no progress thread then raise the awarness of the default progress engine */
opal_progress_event_users_increment();
}
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, false, "event_add(recv) [complete_connect]");
return OPAL_SUCCESS;
}
MCA_BTL_TCP_ENDPOINT_DUMP(1, btl_endpoint, false, " [complete_connect]");
btl_endpoint->endpoint_state = MCA_BTL_TCP_FAILED;
mca_btl_tcp_endpoint_close(btl_endpoint);
return OPAL_ERROR;
}
/*
* A file descriptor is available/ready for recv. Check the state
* of the socket and take the appropriate action.
*/
static void mca_btl_tcp_endpoint_recv_handler(int sd, short flags, void *user)
{
mca_btl_base_endpoint_t *btl_endpoint = (mca_btl_base_endpoint_t *) user;
/* Make sure we don't have a race between a thread that remove the
* recv event, and one event already scheduled.
*/
if (sd != btl_endpoint->endpoint_sd) {
return;
}
/**
* There is an extremely rare race condition here, that can only be
* triggered during the initialization. If the two processes start their
* connection in same time, one of the processes will have to close it's
* previous endpoint (the one opened from the local send). As a result it
* might go in btl_endpoint_close and try to delete the recv_event. This
* call will go back in the libevent, and in a multithreaded case will try
* to lock the event. If another thread noticed the active event (and this
* is possible as during the initialization there will be 2 sockets), one
* thread might get stuck trying to lock the endpoint_recv_lock (while
* holding the event_base lock) while the other thread will try to lock the
* event_base lock (while holding the endpoint_recv lock).
*
* If we can't lock this mutex, it is OK to cancel the receive operation, it
* will be eventually triggered again shortly.
*/
if (OPAL_THREAD_TRYLOCK(&btl_endpoint->endpoint_recv_lock)) {
return;
}
switch (btl_endpoint->endpoint_state) {
case MCA_BTL_TCP_CONNECT_ACK: {
int rc = mca_btl_tcp_endpoint_recv_connect_ack(btl_endpoint);
if (OPAL_SUCCESS == rc) {
/* we are now connected. Start sending the data */
OPAL_THREAD_LOCK(&btl_endpoint->endpoint_send_lock);
mca_btl_tcp_endpoint_connected(btl_endpoint);
OPAL_THREAD_UNLOCK(&btl_endpoint->endpoint_send_lock);
MCA_BTL_TCP_ENDPOINT_DUMP(10, btl_endpoint, true, "connected");
} else if (OPAL_ERR_BAD_PARAM == rc || OPAL_ERROR == rc) {
/* If we get a BAD_PARAM, it means that it probably wasn't
an OMPI process on the other end of the socket (e.g.,
the magic string ID failed). recv_connect_ack already cleaned
up the socket. */
/* If we get OPAL_ERROR, the other end closed the connection
* because it has initiated a symmetrical connexion on its end.
* recv_connect_ack already cleaned up the socket. */
} else {
/* Otherwise, it probably *was* an OMPI peer process on
the other end, and something bad has probably
happened. */
mca_btl_tcp_module_t *m = btl_endpoint->endpoint_btl;
/* Fail up to the PML */
if (NULL != m->tcp_error_cb) {
m->tcp_error_cb(
(mca_btl_base_module_t *) m, MCA_BTL_ERROR_FLAGS_FATAL,
btl_endpoint->endpoint_proc->proc_opal,