cmtime.c

/*
 * Copyright (c) 2013 Intel Corporation.  All rights reserved.
 * Copyright (c) Nvidia Corporation.  All rights reserved.
 *
 * This software is available to you under the OpenIB.org BSD license
 * below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AWV
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <stdbool.h>
#include <errno.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdatomic.h>
#include <netinet/tcp.h>
#include <ccan/container_of.h>

#include <rdma/rdma_cma.h>
#include "common.h"


static struct rdma_addrinfo hints, *rai;
static struct rdma_event_channel *channel;
static int oob_sock = -1;
static const char *port = "7471";
static char *dst_addr;
static char *src_addr;
static int timeout = 2000;
static int retries = 2;
static uint32_t base_qpn = 1000;
static _Atomic(uint32_t) cur_qpn;
static uint32_t mimic_qp_delay;
static bool mimic;

enum step {
	STEP_FULL_CONNECT,
	STEP_CREATE_ID,
	STEP_BIND,
	STEP_RESOLVE_ADDR,
	STEP_RESOLVE_ROUTE,
	STEP_CREATE_QP,
	STEP_INIT_QP_ATTR,
	STEP_INIT_QP,
	STEP_RTR_QP_ATTR,
	STEP_RTR_QP,
	STEP_RTS_QP_ATTR,
	STEP_RTS_QP,
	STEP_CONNECT,
	STEP_ESTABLISH,
	STEP_DISCONNECT,
	STEP_DESTROY_ID,
	STEP_DESTROY_QP,
	STEP_CNT
};

static const char *step_str[] = {
	"full connect",
	"create id",
	"bind addr",
	"resolve addr",
	"resolve route",
	"create qp",
	"init qp attr",
	"init qp",
	"rtr qp attr",
	"rtr qp",
	"rts qp attr",
	"rts qp",
	"cm connect",
	"establish",
	"disconnect",
	"destroy id",
	"destroy qp"
};

struct node {
	struct work_item work;
	struct rdma_cm_id *id;

	struct ibv_qp *qp;
	enum ibv_qp_state next_qps;
	enum step next_step;

	uint64_t times[STEP_CNT][2];
	int retries;
};

static struct work_queue wq;

static struct node *nodes;
static int node_index;
static uint64_t times[STEP_CNT][2];
static int connections;
static int num_threads = 1;
static _Atomic(int) disc_events;

static _Atomic(int) completed[STEP_CNT];

static struct ibv_pd *pd;
static struct ibv_cq *cq;

#define start_perf(n, s)	do { (n)->times[s][0] = gettime_us(); } while (0)
#define end_perf(n, s)		do { (n)->times[s][1] = gettime_us(); } while (0)
#define start_time(s)		do { times[s][0] = gettime_us(); } while (0)
#define end_time(s)		do { times[s][1] = gettime_us(); } while (0)


static inline bool is_client(void)
{
	return dst_addr != NULL;
}

static void show_perf(int iter)
{
	uint32_t diff, max[STEP_CNT], min[STEP_CNT], sum[STEP_CNT];
	int i, c;

	for (i = 0; i < STEP_CNT; i++) {
		sum[i] = 0;
		max[i] = 0;
		min[i] = UINT32_MAX;
		for (c = 0; c < iter; c++) {
			if (nodes[c].times[i][0] && nodes[c].times[i][1]) {
				diff = (uint32_t) (nodes[c].times[i][1] -
						   nodes[c].times[i][0]);
				sum[i] += diff;
				if (diff > max[i])
					max[i] = diff;
				if (diff < min[i])
					min[i] = diff;
			}
		}
		/* Print 0 if we have no data */
		if (min[i] == UINT32_MAX)
			min[i] = 0;
	}

	/* Reporting the 'sum' of the full connect is meaningless */
	sum[STEP_FULL_CONNECT] = 0;

	if (atomic_load(&cur_qpn) == 0)
		printf("qp_conn        %10d\n", iter);
	else
		printf("cm_conn        %10d\n", iter);
	printf("threads        %10d\n", num_threads);

	printf("step             avg/iter  total(us)    us/conn    sum(us)    max(us)    min(us)\n");
	for (i = 0; i < STEP_CNT; i++) {
		diff = (uint32_t) (times[i][1] - times[i][0]);

		printf("%-13s  %10u %10u %10u %10u %10d %10u\n",
			step_str[i], diff / iter, diff,
			sum[i] / iter, sum[i], max[i], min[i]);
	}
}

static inline bool need_verbs(void)
{
	return pd == NULL;
}

static void open_verbs(struct rdma_cm_id *id)
{
	printf("\tAllocating verbs resources\n");
	pd = ibv_alloc_pd(id->verbs);
	if (!pd) {
		perror("ibv_alloc_pd");
		exit(EXIT_FAILURE);
	}

	cq = ibv_create_cq(id->verbs, 1, NULL, NULL, 0);
	if (!cq) {
		perror("ibv_create_cq");
		exit(EXIT_FAILURE);
	}
}

static void create_qp(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);
	struct ibv_qp_init_attr attr;

	if (need_verbs())
		open_verbs(n->id);

	attr.qp_context = n;
	attr.send_cq = cq;
	attr.recv_cq = cq;
	attr.srq = NULL;
	attr.qp_type = IBV_QPT_RC;
	attr.sq_sig_all = 1;

	attr.cap.max_send_wr = 1;
	attr.cap.max_recv_wr = 1;
	attr.cap.max_send_sge = 1;
	attr.cap.max_recv_sge = 1;
	attr.cap.max_inline_data = 0;

	start_perf(n, STEP_CREATE_QP);
	if (atomic_load(&cur_qpn) == 0) {
		n->qp = ibv_create_qp(pd, &attr);
		if (!n->qp) {
			perror("ibv_create_qp");
			exit(EXIT_FAILURE);
		}
	} else {
		sleep_us(mimic_qp_delay);
	}
	end_perf(n, STEP_CREATE_QP);
	atomic_fetch_add(&completed[STEP_CREATE_QP], 1);
}

static void
modify_qp(struct node *n, enum ibv_qp_state state, enum step attr_step)
{
	struct ibv_qp_attr attr;
	int mask, ret;

	attr.qp_state = state;
	start_perf(n, attr_step);
	ret = rdma_init_qp_attr(n->id, &attr, &mask);
	if (ret) {
		perror("rdma_init_qp_attr");
		exit(EXIT_FAILURE);
	}
	end_perf(n, attr_step++);

	start_perf(n, attr_step);
	if (n->qp) {
		ret = ibv_modify_qp(n->qp, &attr, mask);
		if (ret) {
			perror("ibv_modify_qp");
			exit(EXIT_FAILURE);

		}
	} else {
		sleep_us(mimic_qp_delay);
	}
	end_perf(n, attr_step);
	atomic_fetch_add(&completed[attr_step], 1);
}

static void modify_qp_work(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);

	modify_qp(n, n->next_qps, n->next_step);
}

static void init_conn_param(struct node *n, struct rdma_conn_param *param)
{
	param->private_data = rai->ai_connect;
	param->private_data_len = rai->ai_connect_len;
	param->responder_resources = 1;
	param->initiator_depth = 1;
	param->flow_control = 0;
	param->retry_count = 0;
	param->rnr_retry_count = 0;
	param->srq = 0;
	param->qp_num = n->qp ? n->qp->qp_num : atomic_fetch_add(&cur_qpn, 1);
}

static void connect_qp(struct node *n)
{
	struct rdma_conn_param conn_param;
	int ret;

	init_conn_param(n, &conn_param);

	start_perf(n, STEP_CONNECT);
	ret = rdma_connect(n->id, &conn_param);
	if (ret) {
		perror("rdma_connect");
		exit(EXIT_FAILURE);
	}
}

static void resolve_addr(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);
	int ret;

	n->retries = retries;
	start_perf(n, STEP_RESOLVE_ADDR);
	ret = rdma_resolve_addr(n->id, rai->ai_src_addr,
				rai->ai_dst_addr, timeout);
	if (ret) {
		perror("rdma_resolve_addr");
		exit(EXIT_FAILURE);
	}
}

static void resolve_route(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);
	int ret;

	n->retries = retries;
	start_perf(n, STEP_RESOLVE_ROUTE);
	ret = rdma_resolve_route(n->id, timeout);
	if (ret) {
		perror("rdma_resolve_route");
		exit(EXIT_FAILURE);
	}
}

static void connect_response(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);

	modify_qp(n, IBV_QPS_RTR, STEP_RTR_QP_ATTR);
	modify_qp(n, IBV_QPS_RTS, STEP_RTS_QP_ATTR);

	start_perf(n, STEP_ESTABLISH);
	rdma_establish(n->id);
	end_perf(n, STEP_ESTABLISH);

	end_perf(n, STEP_CONNECT);
	end_perf(n, STEP_FULL_CONNECT);
	atomic_fetch_add(&completed[STEP_CONNECT], 1);
}

static void req_handler(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);
	struct rdma_conn_param conn_param;
	int ret;

	create_qp(&n->work);
	modify_qp(n, IBV_QPS_INIT, STEP_INIT_QP_ATTR);
	modify_qp(n, IBV_QPS_RTR, STEP_RTR_QP_ATTR);
	modify_qp(n, IBV_QPS_RTS, STEP_RTS_QP_ATTR);

	init_conn_param(n, &conn_param);
	ret = rdma_accept(n->id, &conn_param);
	if (ret) {
		perror("failure accepting");
		exit(EXIT_FAILURE);
	}
}

static void client_disconnect(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);

	start_perf(n, STEP_DISCONNECT);
	rdma_disconnect(n->id);
	end_perf(n, STEP_DISCONNECT);
	atomic_fetch_add(&completed[STEP_DISCONNECT], 1);
}

static void server_disconnect(struct work_item *item)
{
	struct node *n = container_of(item, struct node, work);

	start_perf(n, STEP_DISCONNECT);
	rdma_disconnect(n->id);
	end_perf(n, STEP_DISCONNECT);

	if (atomic_load(&disc_events) >= connections)
		end_time(STEP_DISCONNECT);
	atomic_fetch_add(&completed[STEP_DISCONNECT], 1);
}

static void cma_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
{
	struct node *n = id->context;

	switch (event->event) {
	case RDMA_CM_EVENT_ADDR_RESOLVED:
		end_perf(n, STEP_RESOLVE_ADDR);
		atomic_fetch_add(&completed[STEP_RESOLVE_ADDR], 1);
		break;
	case RDMA_CM_EVENT_ROUTE_RESOLVED:
		end_perf(n, STEP_RESOLVE_ROUTE);
		atomic_fetch_add(&completed[STEP_RESOLVE_ROUTE], 1);
		break;
	case RDMA_CM_EVENT_CONNECT_REQUEST:
		if (node_index == 0) {
			printf("\tAccepting\n");
			start_time(STEP_CONNECT);
		}
		n = &nodes[node_index++];
		n->id = id;
		id->context = n;
		wq_insert(&wq, &n->work, req_handler);
		break;
	case RDMA_CM_EVENT_CONNECT_RESPONSE:
		wq_insert(&wq, &n->work, connect_response);
		break;
	case RDMA_CM_EVENT_ESTABLISHED:
		if (atomic_fetch_add(&completed[STEP_CONNECT], 1) >=
		    connections - 1)
			end_time(STEP_CONNECT);
		break;
	case RDMA_CM_EVENT_ADDR_ERROR:
		if (n->retries--) {
			if (!rdma_resolve_addr(n->id, rai->ai_src_addr,
					       rai->ai_dst_addr, timeout))
				break;
		}
		printf("RDMA_CM_EVENT_ADDR_ERROR, error: %d\n", event->status);
		exit(EXIT_FAILURE);
		break;
	case RDMA_CM_EVENT_ROUTE_ERROR:
		if (n->retries--) {
			if (!rdma_resolve_route(n->id, timeout))
				break;
		}
		printf("RDMA_CM_EVENT_ROUTE_ERROR, error: %d\n", event->status);
		exit(EXIT_FAILURE);
		break;
	case RDMA_CM_EVENT_CONNECT_ERROR:
	case RDMA_CM_EVENT_UNREACHABLE:
	case RDMA_CM_EVENT_REJECTED:
		printf("event: %s, error: %d\n",
		       rdma_event_str(event->event), event->status);
		exit(EXIT_FAILURE);
		break;
	case RDMA_CM_EVENT_DISCONNECTED:
		if (!is_client()) {
			/* To fix an issue where DREQs are not responded
			 * to, the client completes its disconnect phase
			 * as soon as it calls rdma_disconnect and does
			 * not wait for a response from the server.  The
			 * OOB sync handles that coordiation
			end_perf(n, STEP_DISCONNECT);
			atomic_fetch_add(&completed[STEP_DISCONNECT], 1);
		} else {
			 */
			if (atomic_fetch_add(&disc_events, 1) == 0) {
				printf("\tDisconnecting\n");
				start_time(STEP_DISCONNECT);
			}
			wq_insert(&wq, &n->work, server_disconnect);
		}
		break;
	case RDMA_CM_EVENT_TIMEWAIT_EXIT:
		break;
	default:
		printf("Unhandled event: %d (%s)\n", event->event,
			rdma_event_str(event->event));
		exit(EXIT_FAILURE);
		break;
	}
	rdma_ack_cm_event(event);
}

static void create_ids(int iter)
{
	int ret, i;

	printf("\tCreating IDs\n");
	start_time(STEP_CREATE_ID);
	for (i = 0; i < iter; i++) {
		start_perf(&nodes[i], STEP_FULL_CONNECT);
		start_perf(&nodes[i], STEP_CREATE_ID);
		ret = rdma_create_id(channel, &nodes[i].id, &nodes[i],
					hints.ai_port_space);
		if (ret) {
			perror("rdma_create_id");
			exit(EXIT_FAILURE);
		}
		end_perf(&nodes[i], STEP_CREATE_ID);
	}
	end_time(STEP_CREATE_ID);
}

static void destroy_ids(int iter)
{
	int i;

	start_time(STEP_DESTROY_ID);
	for (i = 0; i < iter; i++) {
		start_perf(&nodes[i], STEP_DESTROY_ID);
		if (nodes[i].id)
			rdma_destroy_id(nodes[i].id);
		end_perf(&nodes[i], STEP_DESTROY_ID);
	}
	end_time(STEP_DESTROY_ID);
}

static void destroy_qps(int iter)
{
	int i;

	start_time(STEP_DESTROY_QP);
	for (i = 0; i < iter; i++) {
		start_perf(&nodes[i], STEP_DESTROY_QP);
		if (nodes[i].qp)
			ibv_destroy_qp(nodes[i].qp);
		end_perf(&nodes[i], STEP_DESTROY_QP);
	}
	end_time(STEP_DESTROY_QP);
}

static void *process_events(void *arg)
{
	struct rdma_cm_event *event;
	int ret;

	while (1) {
		ret = rdma_get_cm_event(channel, &event);
		if (!ret) {
			cma_handler(event->id, event);
		} else {
			perror("rdma_get_cm_event");
			exit(EXIT_FAILURE);
		}
	}

	return NULL;
}

static void server_listen(struct rdma_cm_id **listen_id)
{
	int ret;

	ret = rdma_create_id(channel, listen_id, NULL, hints.ai_port_space);
	if (ret) {
		perror("rdma_create_id");
		exit(EXIT_FAILURE);
	}

	ret = rdma_bind_addr(*listen_id, rai->ai_src_addr);
	if (ret) {
		perror("rdma_bind_addr");
		exit(EXIT_FAILURE);
	}

	ret = rdma_listen(*listen_id, 0);
	if (ret) {
		perror("rdma_listen");
		exit(EXIT_FAILURE);
	}
}

static void reset_test(int iter)
{
	int i;

	node_index = 0;
	atomic_store(&disc_events, 0);
	connections = iter;

	memset(times, 0, sizeof times);
	memset(nodes, 0, sizeof(*nodes) * iter);

	for (i = 0; i < STEP_CNT; i++)
		atomic_store(&completed[i], 0);

	if (is_client())
		oob_sendrecv(oob_sock, 0);
	else
		oob_recvsend(oob_sock, 0);
}

static void server_connect(int iter)
{
	reset_test(iter);

	while (atomic_load(&completed[STEP_CONNECT]) < iter)
		sched_yield();

	oob_recvsend(oob_sock, STEP_CONNECT);

	while (atomic_load(&completed[STEP_DISCONNECT]) < iter)
		sched_yield();

	oob_recvsend(oob_sock, STEP_DISCONNECT);

	destroy_qps(iter);
	destroy_ids(iter);
}

static void client_connect(int iter)
{
	int i, ret;

	reset_test(iter);
	start_time(STEP_FULL_CONNECT);
	create_ids(iter);

	if (src_addr) {
		printf("\tBinding addresses\n");
		start_time(STEP_BIND);
		for (i = 0; i < iter; i++) {
			start_perf(&nodes[i], STEP_BIND);
			ret = rdma_bind_addr(nodes[i].id, rai->ai_src_addr);
			if (ret) {
				perror("rdma_bind_addr");
				exit(EXIT_FAILURE);
			}
			end_perf(&nodes[i], STEP_BIND);
		}
		end_time(STEP_BIND);
	}

	printf("\tResolving addresses\n");
	start_time(STEP_RESOLVE_ADDR);
	for (i = 0; i < iter; i++)
		wq_insert(&wq, &nodes[i].work, resolve_addr);

	while (atomic_load(&completed[STEP_RESOLVE_ADDR]) < iter)
		sched_yield();
	end_time(STEP_RESOLVE_ADDR);

	printf("\tResolving routes\n");
	start_time(STEP_RESOLVE_ROUTE);
	for (i = 0; i < iter; i++)
		wq_insert(&wq, &nodes[i].work, resolve_route);

	while (atomic_load(&completed[STEP_RESOLVE_ROUTE]) < iter)
		sched_yield();
	end_time(STEP_RESOLVE_ROUTE);

	printf("\tCreating QPs\n");
	start_time(STEP_CREATE_QP);
	for (i = 0; i < iter; i++)
		wq_insert(&wq, &nodes[i].work, create_qp);

	while (atomic_load(&completed[STEP_CREATE_QP]) < iter)
		sched_yield();
	end_time(STEP_CREATE_QP);

	printf("\tModify QPs to INIT\n");
	start_time(STEP_INIT_QP);
	for (i = 0; i < iter; i++) {
		nodes[i].next_qps = IBV_QPS_INIT;
		nodes[i].next_step = STEP_INIT_QP_ATTR;
		wq_insert(&wq, &nodes[i].work, modify_qp_work);
	}
	while (atomic_load(&completed[STEP_INIT_QP]) < iter)
		sched_yield();
	end_time(STEP_INIT_QP);

	printf("\tConnecting\n");
	start_time(STEP_CONNECT);
	for (i = 0; i < iter; i++)
		connect_qp(&nodes[i]);

	while (atomic_load(&completed[STEP_CONNECT]) < iter)
		sched_yield();
	end_time(STEP_CONNECT);
	end_time(STEP_FULL_CONNECT);

	oob_sendrecv(oob_sock, STEP_CONNECT);

	printf("\tDisconnecting\n");
	start_time(STEP_DISCONNECT);
	for (i = 0; i < iter; i++)
		wq_insert(&wq, &nodes[i].work, client_disconnect);

	while (atomic_load(&completed[STEP_DISCONNECT]) < iter)
		sched_yield();
	end_time(STEP_DISCONNECT);

	oob_sendrecv(oob_sock, STEP_DISCONNECT);

	/* Wait for event threads to exit before destroying resources */
	printf("\tDestroying QPs\n");
	destroy_qps(iter);
	printf("\tDestroying IDs\n");
	destroy_ids(iter);
}

static void run_client(int iter)
{
	int ret;

	ret = oob_client_setup(dst_addr, port, &oob_sock);
	if (ret)
		exit(EXIT_FAILURE);

	printf("Client warmup\n");
	client_connect(1);

	if (!mimic) {
		printf("Connect (%d) QPs test\n", iter);
	} else {
		printf("Connect (%d) simulated QPs test (delay %d us)\n",
			iter, mimic_qp_delay);
		atomic_store(&cur_qpn, base_qpn);
	}
	client_connect(iter);
	show_perf(iter);

	printf("Connect (%d) test - no QPs\n", iter);
	atomic_store(&cur_qpn, base_qpn);
	mimic_qp_delay = 0;
	client_connect(iter);
	show_perf(iter);

	close(oob_sock);
}

static void run_server(int iter)
{
	struct rdma_cm_id *listen_id;
	int ret;

	/* Make sure we're ready for RDMA prior to any OOB sync */
	server_listen(&listen_id);

	ret = oob_server_setup(src_addr, port, &oob_sock);
	if (ret)
		exit(EXIT_FAILURE);


	printf("Server warmup\n");
	server_connect(1);

	if (!mimic) {
		printf("Accept (%d) QPs test\n", iter);
	} else {
		printf("Accept (%d) simulated QPs test (delay %d us)\n",
			iter, mimic_qp_delay);
		atomic_store(&cur_qpn, base_qpn);
	}
	server_connect(iter);
	show_perf(iter);

	printf("Accept (%d) test - no QPs\n", iter);
	atomic_store(&cur_qpn, base_qpn);
	mimic_qp_delay = 0;
	server_connect(iter);
	show_perf(iter);

	close(oob_sock);
	rdma_destroy_id(listen_id);
}

int main(int argc, char **argv)
{
	pthread_t event_thread;
	int iter = 100;
	int op, ret;

	hints.ai_port_space = RDMA_PS_TCP;
	hints.ai_qp_type = IBV_QPT_RC;
	while ((op = getopt(argc, argv, "s:b:c:m:n:p:q:r:t:")) != -1) {
		switch (op) {
		case 's':
			dst_addr = optarg;
			break;
		case 'b':
			src_addr = optarg;
			break;
		case 'c':
			iter = atoi(optarg);
			break;
		case 'p':
			port = optarg;
			break;
		case 'q':
			base_qpn = (uint32_t) atoi(optarg);
			break;
		case 'm':
			mimic_qp_delay = (uint32_t) atoi(optarg);
			mimic = true;
			break;
		case 'n':
			num_threads = (uint32_t) atoi(optarg);
			break;
		case 'r':
			retries = atoi(optarg);
			break;
		case 't':
			timeout = atoi(optarg);
			break;
		default:
			printf("usage: %s\n", argv[0]);
			printf("\t[-s server_address]\n");
			printf("\t[-b bind_address]\n");
			printf("\t[-c connections]\n");
			printf("\t[-p port_number]\n");
			printf("\t[-q base_qpn]\n");
			printf("\t[-m mimic_qp_delay_us]\n");
			printf("\t[-n num_threads]\n");
			printf("\t[-r retries]\n");
			printf("\t[-t timeout_ms]\n");
			exit(EXIT_FAILURE);
		}
	}

	if (!is_client())
		hints.ai_flags |= RAI_PASSIVE;
	ret = get_rdma_addr(src_addr, dst_addr, port, &hints, &rai);
	if (ret) {
		perror("get_rdma_addr");
		exit(EXIT_FAILURE);
	}

	channel = create_event_channel();
	if (!channel) {
		perror("create_event_channel");
		exit(EXIT_FAILURE);
	}

	ret = pthread_create(&event_thread, NULL, process_events, NULL);
	if (ret) {
		perror("pthread_create");
		exit(EXIT_FAILURE);
	}

	nodes = calloc(sizeof *nodes, iter);
	if (!nodes) {
		perror("calloc");
		exit(EXIT_FAILURE);
	}

	ret = wq_init(&wq, num_threads);
	if (ret)
		goto free;

	if (is_client())
		run_client(iter);
	else
		run_server(iter);

	wq_cleanup(&wq);
free:
	free(nodes);
	rdma_destroy_event_channel(channel);
	rdma_freeaddrinfo(rai);
	return 0;
}