Low Latency Technology 2012 가을 행사 자료(2)

1.
Low Latency Technology 2012 Fall 행사중 RDMA는 많이 아쉬운 행사입니다. 해외에서 개발자를 초청했지만 개발자가 준비했던 만큼 충실히 전달하지 못했기때문입니다. 물론 동시통역을 하면 좀 다른 모습을 보였을 듯 합니다만 RDMA와 관련한 전문통역자가 있을리 만무하고 예산문제도 있었서 포기했습니다.

최초 4시간을 기준으로 만들었던 프로그램입니다. 말이 통하지 않는 사람들이 모여서 강의를 하려니까 시간관리를 잘 하지 못하고 일찍 마무리하였습니다. 샘플코드를 설명하는 부분도 예상과 달랐습니다. pair programming을 하는 방식으로 강의를 할 줄 알았습니다.(^^) 그런데 아니더군요. 행사 당일 부족했던 부분을 문서로 채우려고 합니다. 개발자들의 언어는 영어도 아니고 한글도 아니고 C/C++이기때문에 프로그래밍 언어가 발표자의 생각을 더 잘 전달하리라 생각합니다.

총 18개의 샘플입니다. 참석자들에게 배포하기 위하여 하나의 문서로 만드니까 약 500쪽이 나옵니다. 작지 않은 분량입니다. 더불어 Infiniband를 이용한 RDMA 프로그래밍을 아래를 참고하시길 바랍니다. 좀 오랜 자료입니다.

IB RDMA 프로그래밍

또한 iWARP환경을 구축하기 어려울 경우 Soft-iWARP환경을 구축하여 개발환경을 구축하는 것도 방법입니다.

자본시장내에서의 OFED

2.
행사 당일 발표하였던 자료를 원하시면 아래 메일을 이용하여 요청을 해주시길 바랍니다. 반드시 소속 및 하시는 일을 적어주셔야 보내드립니다. 이점 잊지 마시길 바랍니다.

전자우편 보내기

아래는 행사중 소개하였던 예제중 일부입니다.

//1 “server connect with connection management abstraction call”
//2 “server connect with connection management abstraction function”
//3 “create event channel”
//4 “create connection manager identifier”
//5 “initialize connection manager abstraction context call”
//6 “initialize connection management abstraction context function”
//7 “allocate protection domain”
//8 “allocate memory region”
//9 “create completion channel”
//10 “create receive completion queue”
//11 “create send completion queue”
//12 “create queue pair”
//13 “post receive”
//14 “rdma accept”
//15 “iwarp verbs rdma send work request”
//16 “iwarp verbs poll completion queue”
//17 “iwarp verbs post send”
//18 “iwarp verbs post receive”
//19 “iwarp verbs poll completion queue”
//20 “finish test server”

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2005 Hewlett Packard, Inc (Grant Grundler)
 * Copyright (c) 2007 Chelsio Communications, Inc.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or 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 AND
 * 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.
 *
 * $Id$
 */

#if HAVE_CONFIG_H
#  include <config.h>
#endif /* HAVE_CONFIG_H */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netdb.h>
#include <malloc.h>
#include <getopt.h>
#include <arpa/inet.h>
#include <byteswap.h>
#include <time.h>
#include <signal.h>

#include <infiniband/verbs.h>
#include <rdma/rdma_cma.h>

#include "get_clock.h"

#define PINGPONG_RDMA_WRID	3

static int page_size;
static int done;
static int verbose;
static int myserver;

struct report_options {
	int unsorted;
	int histogram;
	int cycles;   /* report delta's in cycles, not microsec's */
};

struct pingpong_context {
	struct ibv_context *context;
	struct ibv_pd      *pd;
	struct ibv_mr      *mr;
	struct ibv_cq      *scq;
	struct ibv_cq      *rcq;
	struct ibv_qp      *qp;
	struct ibv_comp_channel *ch;
	struct rdma_event_channel *rch;
	void               *buf;
	volatile char      *post_buf;
	volatile char      *poll_buf;
	int                 size;
	int                 tx_depth;
	struct ibv_sge list;
	struct ibv_send_wr wr;
	struct rdma_cm_id  *cm_id;
};

struct pingpong_dest {
	int lid;
	int qpn;
	int psn;
	unsigned rkey;
	unsigned long long vaddr;
};

static void pp_post_recv(struct pingpong_context *ctx, int size, int count)
{
	struct ibv_sge list;
	struct ibv_recv_wr wr, *bad_wr;
	int rc;

	list.addr = (uintptr_t) ctx->buf;
	list.length = size;
	list.lkey = ctx->mr->lkey;
	wr.next = NULL;
	wr.wr_id = 0xdead0001;
	wr.sg_list = &list;
	wr.num_sge = 1;
	while (!done && count--) {
		wr.wr_id++;
		rc = ibv_post_recv(ctx->qp, &wr, &bad_wr);
		if (rc) {
			fprintf(stderr, "%s ibv_post_recv failed %d\n", __FUNCTION__, rc);
		}
	}
}

static struct pingpong_context *pp_create_cma_ctx()
{
	struct pingpong_context *ctx;

	ctx = malloc(sizeof *ctx);
	if (!ctx)
		return NULL;
	return ctx;
}

static struct pingpong_context *pp_init_cma_ctx(struct pingpong_context *ctx,
					    struct rdma_cm_id *cm_id,
					    unsigned size,
					    int tx_depth, int port) //comment6 “initialize connection management abstraction context function”
{
	ctx->size     = size;
	ctx->tx_depth = tx_depth;

	ctx->buf = memalign(page_size, size * 2);
	if (!ctx->buf) {
		fprintf(stderr, "Couldn't allocate work buf.\n");
		return NULL;
	}

	memset(ctx->buf, 0, size * 2);

	ctx->post_buf = (char*)ctx->buf + (size - 1);
	ctx->poll_buf = (char*)ctx->buf + (2 * size - 1);

	ctx->cm_id = cm_id;
	ctx->context = cm_id->verbs;
	if (!ctx->context) {
		fprintf(stderr, "%s Unbound cm_id!!\n", __FUNCTION__);
		return NULL;
	}

	ctx->pd = ibv_alloc_pd(ctx->context); //comment7 “allocate protection domain”
	if (!ctx->pd) {
		fprintf(stderr, "Couldn't allocate PD\n");
		return NULL;
	}

        /* We dont really want IBV_ACCESS_LOCAL_WRITE, but IB spec says:
         * The Consumer is not allowed to assign Remote Write or Remote Atomic to
         * a Memory Region that has not been assigned Local Write. */
	ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size * 2,
			     IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_LOCAL_WRITE); //comment8 “allocate memory region”
	if (!ctx->mr) {
		fprintf(stderr, "Couldn't allocate MR\n");
		return NULL;
	}

	ctx->ch = ibv_create_comp_channel(ctx->context); //comment9 “create completion channel”
	if (!ctx->ch) {
		fprintf(stderr, "Couldn't create comp channel\n");
		return NULL;
	}

	ctx->rcq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment10 “create receive completion queue”
	if (!ctx->rcq) {
		fprintf(stderr, "Couldn't create RCQ\n");
		return NULL;
	}

	ctx->scq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment11 “create send completion queue”
	if (!ctx->scq) {
		fprintf(stderr, "Couldn't create SCQ\n");
		return NULL;
	}

	{
		struct ibv_qp_init_attr attr = {
			.send_cq = ctx->scq,
			.recv_cq = ctx->rcq,
			.cap     = {
				.max_send_wr  = tx_depth,
				.max_recv_wr  = tx_depth*2,
				.max_send_sge = 1,
				.max_recv_sge = 1,
				.max_inline_data = 64,
			},
			.qp_type = IBV_QPT_RC
		};

		if (rdma_create_qp(ctx->cm_id, ctx->pd, &attr)) {//comment12 “create queue pair”
			fprintf(stderr, "Couldn't create QP\n");
			return NULL;
		}
		ctx->qp = ctx->cm_id->qp;
	}

	return ctx;
}

static struct pingpong_context *pp_server_connect_cma(unsigned short port, int size, int tx_depth,
						      struct pingpong_dest *my_dest, 
						      struct pingpong_dest *rem_dest) //comment2 “server connect with connection management abstraction function”
{
	struct rdma_cm_id *listen_id;
	struct rdma_cm_event *event;
	struct rdma_conn_param conn_param;
	int ret;
	struct sockaddr_in sin;
	struct rdma_cm_id *child_cm_id;
	struct pingpong_context *ctx;

	ctx = pp_create_cma_ctx();
	if (!ctx) {
		fprintf(stderr, "Couldn't create cma context\n");
		return NULL;
	}

	ctx->rch = rdma_create_event_channel();//comment3 “create event channel”

	if (!ctx->rch) {
		fprintf(stderr, "Couldn't create RDMA event channel\n");
		return NULL;
	}

	ret = rdma_create_id(ctx->rch, &listen_id, NULL, RDMA_PS_TCP); //comment4 “create connection manager identifier”
	if (ret) {
		fprintf(stderr, "%s rdma_create_id failed %d\n", __FUNCTION__, ret);
		return NULL;
	}

	sin.sin_addr.s_addr = 0;
	sin.sin_family = PF_INET;
	sin.sin_port = htons(port);
	ret = rdma_bind_addr(listen_id, (struct sockaddr *)&sin); 
	if (ret) {
		fprintf(stderr,"%s rdma_bind_addr failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_listen(listen_id, 0); 
	if (ret) {
		fprintf(stderr,"%s rdma_listen failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	if (myserver) {
		printf("SERVER READY");
		fflush(stdout);
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_CONNECT_REQUEST) {
		fprintf(stderr,"%s bad event waiting for connect request %d\n", __FUNCTION__, 
		       event->event);
		goto err1;
	}

	if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {
		ret = 1;
		fprintf(stderr,"%s bad private data len %d\n", __FUNCTION__, 
		       event->param.conn.private_data_len);
		goto err1;
	}
#if 0
	if (event->param.conn.private_data_len != sizeof(*rem_dest)) {
		fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n", 
			__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));
	}
#endif
	memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));
	child_cm_id = (struct rdma_cm_id *)event->id;
	ctx = pp_init_cma_ctx(ctx, child_cm_id, size, tx_depth, port); //comment5 “initialize connection manager abstraction context call”

	if (!ctx) {
		fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);
		goto err0;
	}

	my_dest->qpn = 0;
	my_dest->psn = 0xbb;
	my_dest->rkey = ctx->mr->rkey;
	my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;
	memset(&conn_param, 0, sizeof conn_param);
	conn_param.responder_resources = 1;
	conn_param.initiator_depth = 1;
	conn_param.private_data = my_dest;
	conn_param.private_data_len = sizeof(*my_dest);
	pp_post_recv(ctx, size, tx_depth); //comment13 “post receive”
	ret = rdma_accept(ctx->cm_id, &conn_param); //comment14 “rdma accept”
	if (ret) {
		fprintf(stderr,"%s rdma_accept failed %d\n", __FUNCTION__, ret);
		goto err0;
	}
	rdma_ack_cm_event(event);
	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) {
		fprintf(stderr,"rdma_get_cm_event error %d\n", ret);
		rdma_destroy_id(child_cm_id);
		goto err2;
	}
	if (event->event != RDMA_CM_EVENT_ESTABLISHED) {
		fprintf(stderr,"%s bad event waiting for established %d\n", __FUNCTION__, 
		       event->event);
		goto err0;
	}
	rdma_ack_cm_event(event);
	return ctx;
err0:
	rdma_destroy_id(child_cm_id);
err1:
	rdma_ack_cm_event(event);
err2:
	rdma_destroy_id(listen_id);
	fprintf(stderr,"%s NOT connected!\n", __FUNCTION__);
	return NULL;
}

static unsigned get_dst_addr(const char *dst)
{
	struct addrinfo *res;
	int ret;
	unsigned addr;

	ret = getaddrinfo(dst, NULL, NULL, &res);
	if (ret) {
		fprintf(stderr, "%s getaddrinfo failed - invalid hostname or IP address\n",
			__FUNCTION__);
		return 0;
	}

	if (res->ai_family != PF_INET) {
		return 0;
	}

	addr = ((struct sockaddr_in*)res->ai_addr)->sin_addr.s_addr;
	freeaddrinfo(res);
	return addr;
}

static struct pingpong_context *pp_client_connect_cma(const char *servername, 
						      unsigned short port, int size, int tx_depth, 
						      struct pingpong_dest *my_dest, 
						      struct pingpong_dest *rem_dest)
{
	struct rdma_cm_event *event;
	struct rdma_conn_param conn_param;
	int ret;
	struct sockaddr_in sin;
	struct rdma_cm_id *cm_id;
	struct pingpong_context *ctx;

	sin.sin_addr.s_addr = get_dst_addr(servername);
	if (!sin.sin_addr.s_addr) {
		return NULL;
	}

	ctx = pp_create_cma_ctx();
	if (!ctx) {
		fprintf(stderr, "Couldn't create cma context\n");
		return NULL;
	}

	ctx->rch = rdma_create_event_channel();
	if (!ctx->rch) {
		fprintf(stderr, "Couldn't create RDMA event channel\n");
		return NULL;
	}

	ret = rdma_create_id(ctx->rch, &cm_id, NULL, RDMA_PS_TCP);
	if (ret) {
		fprintf(stderr,"%s rdma_create_id failed %d\n", __FUNCTION__, ret);
		return NULL;
	}

	sin.sin_family = PF_INET;
	sin.sin_port = htons(port);
	ret = rdma_resolve_addr(cm_id, NULL, (struct sockaddr *)&sin, 2000);
	if (ret) {
		fprintf(stderr,"%s rdma_resolve_addr failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_ADDR_RESOLVED) {
		fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,
		       event->event);
		goto err1;
	}
	rdma_ack_cm_event(event);

	ret = rdma_resolve_route(cm_id, 2000);
	if (ret) {
		fprintf(stderr,"%s rdma_resolve_route failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) {
		fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,
		       event->event);
		goto err1;
	}
	rdma_ack_cm_event(event);

	ctx = pp_init_cma_ctx(ctx, cm_id, size, tx_depth, port);

	if (!ctx) {
		fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);
		goto err2;
	}

	my_dest->qpn = 0;
	my_dest->psn = 0xaa;
	my_dest->rkey = ctx->mr->rkey;
	my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;
	memset(&conn_param, 0, sizeof conn_param);
	conn_param.responder_resources = 1;
	conn_param.initiator_depth = 1;
	conn_param.retry_count = 5;
	conn_param.private_data = my_dest;
	conn_param.private_data_len = sizeof(*my_dest);
	pp_post_recv(ctx, size, tx_depth*2);
	ret = rdma_connect(ctx->cm_id, &conn_param);
	if (ret) {
		fprintf(stderr,"%s rdma_connect failure %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_ESTABLISHED) {
		fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,
		       event->event);
		goto err1;
	}
	if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {
		fprintf(stderr,"%s bad private data ptr %p len %d\n", __FUNCTION__,
		       event->param.conn.private_data, event->param.conn.private_data_len);
		goto err1;
	}
#if 0
	if (event->param.conn.private_data_len != sizeof(*rem_dest)) {
		fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n", 
			__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));
	}
#endif
	memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));
	rdma_ack_cm_event(event);
	return ctx;
err1:
	rdma_ack_cm_event(event);
err2:
	fprintf(stderr,"NOT connected!\n");
	rdma_destroy_id(cm_id);
	return NULL;
}

static void usage(const char *argv0)
{
	printf("Usage:\n");
	printf("  %s            start a server and wait for connection\n", argv0);
	printf("  %s <host>     connect to server at <host>\n", argv0);
	printf("\n");
	printf("Options:\n");
	printf("  -p, --port=<port>      listen on/connect to port <port> (default 18515)\n");
	printf("  -s, --size=<size>      size of message to exchange (default 1)\n");
	printf("  -t, --tx-depth=<dep>   size of tx queue (default 1)\n");
	printf("  -P, --poll    	 Spin polling for completions (default is blocking)\n");
	printf("  -I, --inline    	 Use IBV_SEND_INLINE (default no inline)\n");
	printf("  -T, --time=<secs>    	 Run test for <secs> seconds (default is 10)\n");
	printf("  -v, --verbose    	 be verbose.\n");
	printf("  -A, --abortmode	 abort instead of graceful close\n");
	printf("  -n, --nortr	 	 server starts test (no rtr)\n");
}

static void print_report(int size, int iters, struct timeval *start_time, struct timeval *stop_time)
{
	time_t sec;
	suseconds_t usec;
	float elapsed;
	double bytes_sent = 2 * size * iters;
	double throughput;

	if (stop_time->tv_usec < start_time->tv_usec) {
		stop_time->tv_usec += 1000000;
		stop_time->tv_sec  -= 1;
	}
	sec     = stop_time->tv_sec - start_time->tv_sec;
	usec    = stop_time->tv_usec - start_time->tv_usec;
	elapsed = (float)sec + ((float)usec/(float)1000000.0);
	throughput = iters / elapsed;

	printf("Bytes %g elapsed sec %d usec %d\n", bytes_sent, (unsigned)sec, (unsigned)usec);
	printf("Average transfer rate: %g messages/sec\n", throughput);
	printf("RTT/2 = %g us\n", (double)1 / throughput / (double)2 * (double)(1000 * 1000));
}

int abortmode;

void sig_handler(int foo)
{
	done = 1;
	if (verbose)
		printf("Alarm\n");
	if (abortmode)
		exit(1);
}

int main(int argc, char *argv[])
{
	int                      port = 18515;
	int                      size = 1;
	int                      tx_depth = 1;
	struct pingpong_context *ctx;
	char                    *servername = NULL;
	struct pingpong_dest     rem_dest;
	struct ibv_qp           *qp;
	struct ibv_send_wr      *wr;
	int                      scnt, rcnt, ccnt;
	struct timeval		 start_time, stop_time;
	struct timezone	 	 tz;
	int			 poll = 0;
	struct ibv_cq 		*ev_cq;
	void 			*ev_ctx;
	int 			send_inline = 0;
	int 			run_time = 10;
	struct 			ibv_wc wc;
	int 			ne;
	int			zerobyte = 0;
	struct ibv_send_wr 	*bad_wr;
	int 			count;
	int			peer2peer = 0;

	/* Parameter parsing. */
	while (1) {
		int c;

		static struct option long_options[] = {
			{ .name = "port",           .has_arg = 1, .val = 'p' },
			{ .name = "size",           .has_arg = 1, .val = 's' },
			{ .name = "tx-depth",       .has_arg = 1, .val = 't' },
			{ .name = "poll", 	    .has_arg = 0, .val = 'P' },
			{ .name = "inline", 	    .has_arg = 0, .val = 'I' },
			{ .name = "time",           .has_arg = 1, .val = 'T' },
			{ .name = "verbose",        .has_arg = 0, .val = 'v' },
			{ .name = "myserver",	    .has_arg = 0, .val = 'm' },
			{ .name = "abortmode",	    .has_arg = 0, .val = 'A' },
			{ .name = "nortr",	    .has_arg = 0, .val = 'n' },
			{ 0 }
		};

		c = getopt_long(argc, argv, "nAp:s:t:T:PIv", long_options, NULL);
		if (c == -1)
			break;

		switch (c) {

		case 'n':
			peer2peer = 1;
			break;

		case 'A':
			abortmode = 1;
			break;

		case 'm':
			myserver = 1;
			break;

		case 'v':
			verbose = 1;
			break;

		case 'I':
			send_inline = IBV_SEND_INLINE;
			break;

		case 'P':
			poll = 1;
			break;

		case 'p':
			port = strtol(optarg, NULL, 0);
			if (port < 0 || port > 65535) {
				usage(argv[0]);
				return 1;
			}
			break;

		case 's':
			size = strtol(optarg, NULL, 0);
			if (size < 0) { usage(argv[0]); return 3; }
			if (size == 0) {
				zerobyte=1;
				size = 1; /* so we alloc memory ok */
			}
			break;

		case 't':
			tx_depth = strtol(optarg, NULL, 0);
			if (tx_depth < 1) { usage(argv[0]); return 4; }
			break;

		case 'T':
			run_time = strtol(optarg, NULL, 0);
			if (run_time < 0) { usage(argv[0]); return 4; }
			break;

		default:
			usage(argv[0]);
			return 5;
		}
	}

	if (optind == argc - 1)
		servername = strdupa(argv[optind]);
	else if (optind < argc) {
		usage(argv[0]);
		return 6;
	}

	/*
	 *  Done with parameter parsing. Perform setup.
	 */

	srand48(getpid() * time(NULL));
	page_size = sysconf(_SC_PAGESIZE);

	struct pingpong_dest my_dest;

	memset(&rem_dest, 0, sizeof(rem_dest));

	if (servername)
		ctx = pp_client_connect_cma(servername, port, size, tx_depth, &my_dest, 
					    &rem_dest);
	else
		ctx = pp_server_connect_cma(port, size, tx_depth, &my_dest, &rem_dest); //comment1 “server connect with connection management abstraction call”
	if (!ctx) {
		fprintf(stderr, "pp_connect_cma(%s,%d) failed!\n", servername, port);
		return 7;
	}

	if (verbose) {
		printf("  local address:  PSN %#06x RKey %#08x VAddr %#016Lx\n",
			my_dest.psn, my_dest.rkey, my_dest.vaddr);
		printf("  remote address: PSN %#06x RKey %#08x VAddr %#016Lx\n",
			rem_dest.psn, rem_dest.rkey, rem_dest.vaddr);
	}
	wr = &ctx->wr;
	ctx->list.addr = (uintptr_t)(ctx->buf + size);
	if (zerobyte)
		ctx->list.length = 0;
	else
		ctx->list.length = ctx->size; 
	ctx->list.lkey = ctx->mr->lkey;
	wr->wr_id      = PINGPONG_RDMA_WRID;
	wr->sg_list    = &ctx->list;
	wr->num_sge    = 1;
	wr->opcode     = IBV_WR_SEND; //comment15 “iwarp verbs rdma send work request”
	wr->send_flags = IBV_SEND_SIGNALED;
	if (ctx->size <= 64) 
		wr->send_flags |= send_inline;
	wr->next       = NULL;

	scnt = 0;
	rcnt = 0;
	ccnt = 0;
	qp = ctx->qp;

	if (!poll && ibv_req_notify_cq(ctx->scq, 0)) {
		fprintf(stderr, "ibv_req_notify failed!\n");
		return 1;
	}
	if (!poll && ibv_req_notify_cq(ctx->rcq, 0)) {
		fprintf(stderr, "ibv_req_notify failed!\n");
		return 1;
	}

	/* Done with setup. Start the test. */

	signal(SIGALRM, sig_handler);
	alarm(run_time);
	gettimeofday(&start_time, &tz);
	while (!done) {

		if (scnt >= 1 || (peer2peer && !servername) ||
		    (!peer2peer &&  servername)) {
			int count = tx_depth;

			/* Wait for recv completions */
			while (!done && count--) {
				do {
					ne = ibv_poll_cq(ctx->rcq, 1, &wc); //comment16 “iwarp verbs poll completion queue”
					if (!poll && ne == 0) {
						if (ibv_get_cq_event(ctx->ch, &ev_cq, &ev_ctx)) {
							fprintf(stderr, "Failed to get cq event!\n");
							return 1;
						}
						if (ev_cq != ctx->rcq) {
							fprintf(stderr, "Unkown CQ!\n");
							return 1;
						}
						ibv_ack_cq_events(ctx->rcq, 1);
						ibv_req_notify_cq(ctx->rcq, 0);
					}
					if (done) break;
				} while (ne == 0);
				if (ne < 0) {
					fprintf(stderr, "poll CQ failed %d\n", ne);
					break;
				}
				if (wc.status != IBV_WC_SUCCESS) {
					fprintf(stderr, "Completion wth error at %s:\n",
						servername ? "client" : "server");
					fprintf(stderr, "Failed status %d: wr_id %d\n",
						wc.status, (int) wc.wr_id);
					fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",
						scnt, rcnt, ccnt);
					break;
				}
				if (done) break;
			}
		}

		count = tx_depth;
		while (!done && count--) {
			if (ibv_post_send(qp, wr, &bad_wr)) {//comment17 “iwarp verbs post send”
				fprintf(stderr, "Couldn't post send: scnt=%d\n",
					scnt);
				break;
			}
			scnt++;
			pp_post_recv(ctx, size, 1); //comment18 “iwarp verbs post receive”
			++rcnt;
		}

		while (!done && ccnt < scnt) {
			do {
				ne = ibv_poll_cq(ctx->scq, 1, &wc); //comment19 “iwarp verbs poll completion queue”

				if (ne < 0) {
					fprintf(stderr, "poll CQ failed %d\n", ne);
					break;
				}
			} while (ne == 0);
			if (ne == 1) {
				if (wc.status != IBV_WC_SUCCESS) {
					fprintf(stderr, "Completion wth error at %s:\n",
						servername ? "client" : "server");
					fprintf(stderr, "Failed status %d: wr_id %d\n",
						wc.status, (int) wc.wr_id);
					fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",
						scnt, rcnt, ccnt);
					break;
				}
				++ccnt;
			}
		}
	}
	gettimeofday(&stop_time, &tz);

//comment20 “finish test server”
	if (servername) {
		if (verbose)
			printf("scnt %u ccnt %u rcnt %u\n", scnt, ccnt, rcnt);
		print_report(size, ccnt, &start_time, &stop_time);
		if (myserver) {
			char *buf;
			size_t buflen;
			while (getline(&buf, &buflen, stdin) != -1)
				printf("server: %s", buf);
		}
	}
	return 0;
}

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//1 “server connect with connection management abstraction call”

//2 “server connect with connection management abstraction function”

//3 “create event channel”

//4 “create connection manager identifier”

//5 “initialize connection manager abstraction context call”

//6 “initialize connection management abstraction context function”

//7 “allocate protection domain”

//8 “allocate memory region”

//9 “create completion channel”

//10 “create receive completion queue”

//11 “create send completion queue”

//12 “create queue pair”

//13 “post receive”

//14 “rdma accept”

//15 “iwarp verbs rdma send work request”

//16 “iwarp verbs poll completion queue”

//17 “iwarp verbs post send”

//18 “iwarp verbs post receive”

//19 “iwarp verbs poll completion queue”

//20 “finish test server”

* This software is available to you under a choice of one of two

* licenses. You may choose to be licensed under the terms of the GNU

* General Public License (GPL) Version 2, available from the file

* COPYING in the main directory of this source tree, or 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 AND

* 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.

* $Id$

#if HAVE_CONFIG_H

# include <config.h>

#endif /* HAVE_CONFIG_H */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <netdb.h>

#include <malloc.h>

#include <getopt.h>

#include <arpa/inet.h>

#include <byteswap.h>

#include <time.h>

#include <signal.h>

#include <infiniband/verbs.h>

#include <rdma/rdma_cma.h>

#include "get_clock.h"

#define PINGPONG_RDMA_WRID 3

static int page_size;

static int done;

static int verbose;

static int myserver;

struct report_options {

int unsorted;

int histogram;

int cycles; /* report delta's in cycles, not microsec's */

};

struct pingpong_context {

struct ibv_context *context;

struct ibv_pd *pd;

struct ibv_mr *mr;

struct ibv_cq *scq;

struct ibv_cq *rcq;

struct ibv_qp *qp;

struct ibv_comp_channel *ch;

struct rdma_event_channel *rch;

void *buf;

volatile char *post_buf;

volatile char *poll_buf;

int size;

int tx_depth;

struct ibv_sge list;

struct ibv_send_wr wr;

struct rdma_cm_id *cm_id;

};

struct pingpong_dest {

int lid;

int qpn;

int psn;

unsigned rkey;

unsigned long long vaddr;

};

static void pp_post_recv(struct pingpong_context *ctx, int size, int count)

{

struct ibv_sge list;

struct ibv_recv_wr wr, *bad_wr;

int rc;

list.addr = (uintptr_t) ctx->buf;

list.length = size;

list.lkey = ctx->mr->lkey;

wr.next = NULL;

wr.wr_id = 0xdead0001;

wr.sg_list = &list;

wr.num_sge = 1;

while (!done && count--) {

wr.wr_id++;

rc = ibv_post_recv(ctx->qp, &wr, &bad_wr);

if (rc) {

fprintf(stderr, "%s ibv_post_recv failed %d\n", __FUNCTION__, rc);

}

static struct pingpong_context *pp_create_cma_ctx()

{

struct pingpong_context *ctx;

ctx = malloc(sizeof *ctx);

if (!ctx)

return NULL;

return ctx;

}

static struct pingpong_context *pp_init_cma_ctx(struct pingpong_context *ctx,

struct rdma_cm_id *cm_id,

unsigned size,

int tx_depth, int port) //comment6 “initialize connection management abstraction context function”

{

ctx->size = size;

ctx->tx_depth = tx_depth;

ctx->buf = memalign(page_size, size * 2);

if (!ctx->buf) {

fprintf(stderr, "Couldn't allocate work buf.\n");

return NULL;

}

memset(ctx->buf, 0, size * 2);

ctx->post_buf = (char*)ctx->buf + (size - 1);

ctx->poll_buf = (char*)ctx->buf + (2 * size - 1);

ctx->cm_id = cm_id;

ctx->context = cm_id->verbs;

if (!ctx->context) {

fprintf(stderr, "%s Unbound cm_id!!\n", __FUNCTION__);

return NULL;

}

ctx->pd = ibv_alloc_pd(ctx->context); //comment7 “allocate protection domain”

if (!ctx->pd) {

fprintf(stderr, "Couldn't allocate PD\n");

return NULL;

}

/* We dont really want IBV_ACCESS_LOCAL_WRITE, but IB spec says:

* The Consumer is not allowed to assign Remote Write or Remote Atomic to

* a Memory Region that has not been assigned Local Write. */

ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size * 2,

IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_LOCAL_WRITE); //comment8 “allocate memory region”

if (!ctx->mr) {

fprintf(stderr, "Couldn't allocate MR\n");

return NULL;

}

ctx->ch = ibv_create_comp_channel(ctx->context); //comment9 “create completion channel”

if (!ctx->ch) {

fprintf(stderr, "Couldn't create comp channel\n");

return NULL;

}

ctx->rcq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment10 “create receive completion queue”

if (!ctx->rcq) {

fprintf(stderr, "Couldn't create RCQ\n");

return NULL;

}

ctx->scq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment11 “create send completion queue”

if (!ctx->scq) {

fprintf(stderr, "Couldn't create SCQ\n");

return NULL;

}

{

struct ibv_qp_init_attr attr = {

.send_cq = ctx->scq,

.recv_cq = ctx->rcq,

.cap = {

.max_send_wr = tx_depth,

.max_recv_wr = tx_depth*2,

.max_send_sge = 1,

.max_recv_sge = 1,

.max_inline_data = 64,

.qp_type = IBV_QPT_RC

};

if (rdma_create_qp(ctx->cm_id, ctx->pd, &attr)) {//comment12 “create queue pair”

fprintf(stderr, "Couldn't create QP\n");

return NULL;

}

ctx->qp = ctx->cm_id->qp;

}

return ctx;

}

static struct pingpong_context *pp_server_connect_cma(unsigned short port, int size, int tx_depth,

struct pingpong_dest *my_dest,

struct pingpong_dest *rem_dest) //comment2 “server connect with connection management abstraction function”

{

struct rdma_cm_id *listen_id;

struct rdma_cm_event *event;

struct rdma_conn_param conn_param;

int ret;

struct sockaddr_in sin;

struct rdma_cm_id *child_cm_id;

struct pingpong_context *ctx;

ctx = pp_create_cma_ctx();

if (!ctx) {

fprintf(stderr, "Couldn't create cma context\n");

return NULL;

}

ctx->rch = rdma_create_event_channel();//comment3 “create event channel”

if (!ctx->rch) {

fprintf(stderr, "Couldn't create RDMA event channel\n");

return NULL;

}

ret = rdma_create_id(ctx->rch, &listen_id, NULL, RDMA_PS_TCP); //comment4 “create connection manager identifier”

if (ret) {

fprintf(stderr, "%s rdma_create_id failed %d\n", __FUNCTION__, ret);

return NULL;

}

sin.sin_addr.s_addr = 0;

sin.sin_family = PF_INET;

sin.sin_port = htons(port);

ret = rdma_bind_addr(listen_id, (struct sockaddr *)&sin);

if (ret) {

fprintf(stderr,"%s rdma_bind_addr failed %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_listen(listen_id, 0);

if (ret) {

fprintf(stderr,"%s rdma_listen failed %d\n", __FUNCTION__, ret);

goto err2;

}

if (myserver) {

printf("SERVER READY");

fflush(stdout);

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_CONNECT_REQUEST) {

fprintf(stderr,"%s bad event waiting for connect request %d\n", __FUNCTION__,

event->event);

goto err1;

}

if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {

ret = 1;

fprintf(stderr,"%s bad private data len %d\n", __FUNCTION__,

event->param.conn.private_data_len);

goto err1;

}

#if 0

if (event->param.conn.private_data_len != sizeof(*rem_dest)) {

fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n",

__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));

}

#endif

memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));

child_cm_id = (struct rdma_cm_id *)event->id;

ctx = pp_init_cma_ctx(ctx, child_cm_id, size, tx_depth, port); //comment5 “initialize connection manager abstraction context call”

if (!ctx) {

fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);

goto err0;

}

my_dest->qpn = 0;

my_dest->psn = 0xbb;

my_dest->rkey = ctx->mr->rkey;

my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;

memset(&conn_param, 0, sizeof conn_param);

conn_param.responder_resources = 1;

conn_param.initiator_depth = 1;

conn_param.private_data = my_dest;

conn_param.private_data_len = sizeof(*my_dest);

pp_post_recv(ctx, size, tx_depth); //comment13 “post receive”

ret = rdma_accept(ctx->cm_id, &conn_param); //comment14 “rdma accept”

if (ret) {

fprintf(stderr,"%s rdma_accept failed %d\n", __FUNCTION__, ret);

goto err0;

}

rdma_ack_cm_event(event);

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret) {

fprintf(stderr,"rdma_get_cm_event error %d\n", ret);

rdma_destroy_id(child_cm_id);

goto err2;

}

if (event->event != RDMA_CM_EVENT_ESTABLISHED) {

fprintf(stderr,"%s bad event waiting for established %d\n", __FUNCTION__,

event->event);

goto err0;

}

rdma_ack_cm_event(event);

return ctx;

err0:

rdma_destroy_id(child_cm_id);

err1:

rdma_ack_cm_event(event);

err2:

rdma_destroy_id(listen_id);

fprintf(stderr,"%s NOT connected!\n", __FUNCTION__);

return NULL;

}

static unsigned get_dst_addr(const char *dst)

{

struct addrinfo *res;

int ret;

unsigned addr;

ret = getaddrinfo(dst, NULL, NULL, &res);

if (ret) {

fprintf(stderr, "%s getaddrinfo failed - invalid hostname or IP address\n",

__FUNCTION__);

return 0;

}

if (res->ai_family != PF_INET) {

return 0;

}

addr = ((struct sockaddr_in*)res->ai_addr)->sin_addr.s_addr;

freeaddrinfo(res);

return addr;

}

static struct pingpong_context *pp_client_connect_cma(const char *servername,

unsigned short port, int size, int tx_depth,

struct pingpong_dest *my_dest,

struct pingpong_dest *rem_dest)

{

struct rdma_cm_event *event;

struct rdma_conn_param conn_param;

int ret;

struct sockaddr_in sin;

struct rdma_cm_id *cm_id;

struct pingpong_context *ctx;

sin.sin_addr.s_addr = get_dst_addr(servername);

if (!sin.sin_addr.s_addr) {

return NULL;

}

ctx = pp_create_cma_ctx();

if (!ctx) {

fprintf(stderr, "Couldn't create cma context\n");

return NULL;

}

ctx->rch = rdma_create_event_channel();

if (!ctx->rch) {

fprintf(stderr, "Couldn't create RDMA event channel\n");

return NULL;

}

ret = rdma_create_id(ctx->rch, &cm_id, NULL, RDMA_PS_TCP);

if (ret) {

fprintf(stderr,"%s rdma_create_id failed %d\n", __FUNCTION__, ret);

return NULL;

}

sin.sin_family = PF_INET;

sin.sin_port = htons(port);

ret = rdma_resolve_addr(cm_id, NULL, (struct sockaddr *)&sin, 2000);

if (ret) {

fprintf(stderr,"%s rdma_resolve_addr failed %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_ADDR_RESOLVED) {

fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,

event->event);

goto err1;

}

rdma_ack_cm_event(event);

ret = rdma_resolve_route(cm_id, 2000);

if (ret) {

fprintf(stderr,"%s rdma_resolve_route failed %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) {

fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,

event->event);

goto err1;

}

rdma_ack_cm_event(event);

ctx = pp_init_cma_ctx(ctx, cm_id, size, tx_depth, port);

if (!ctx) {

fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);

goto err2;

}

my_dest->qpn = 0;

my_dest->psn = 0xaa;

my_dest->rkey = ctx->mr->rkey;

my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;

memset(&conn_param, 0, sizeof conn_param);

conn_param.responder_resources = 1;

conn_param.initiator_depth = 1;

conn_param.retry_count = 5;

conn_param.private_data = my_dest;

conn_param.private_data_len = sizeof(*my_dest);

pp_post_recv(ctx, size, tx_depth*2);

ret = rdma_connect(ctx->cm_id, &conn_param);

if (ret) {

fprintf(stderr,"%s rdma_connect failure %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_ESTABLISHED) {

fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,

event->event);

goto err1;

}

if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {

fprintf(stderr,"%s bad private data ptr %p len %d\n", __FUNCTION__,

event->param.conn.private_data, event->param.conn.private_data_len);

goto err1;

}

#if 0

if (event->param.conn.private_data_len != sizeof(*rem_dest)) {

fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n",

__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));

}

#endif

memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));

rdma_ack_cm_event(event);

return ctx;

err1:

rdma_ack_cm_event(event);

err2:

fprintf(stderr,"NOT connected!\n");

rdma_destroy_id(cm_id);

return NULL;

}

static void usage(const char *argv0)

{

printf("Usage:\n");

printf(" %s start a server and wait for connection\n", argv0);

printf(" %s <host> connect to server at <host>\n", argv0);

printf("\n");

printf("Options:\n");

printf(" -p, --port=<port> listen on/connect to port <port> (default 18515)\n");

printf(" -s, --size=<size> size of message to exchange (default 1)\n");

printf(" -t, --tx-depth=<dep> size of tx queue (default 1)\n");

printf(" -P, --poll Spin polling for completions (default is blocking)\n");

printf(" -I, --inline Use IBV_SEND_INLINE (default no inline)\n");

printf(" -T, --time=<secs> Run test for <secs> seconds (default is 10)\n");

printf(" -v, --verbose be verbose.\n");

printf(" -A, --abortmode abort instead of graceful close\n");

printf(" -n, --nortr server starts test (no rtr)\n");

}

static void print_report(int size, int iters, struct timeval *start_time, struct timeval *stop_time)

{

time_t sec;

suseconds_t usec;

float elapsed;

double bytes_sent = 2 * size * iters;

double throughput;

if (stop_time->tv_usec < start_time->tv_usec) {

stop_time->tv_usec += 1000000;

stop_time->tv_sec -= 1;

}

sec = stop_time->tv_sec - start_time->tv_sec;

usec = stop_time->tv_usec - start_time->tv_usec;

elapsed = (float)sec + ((float)usec/(float)1000000.0);

throughput = iters / elapsed;

printf("Bytes %g elapsed sec %d usec %d\n", bytes_sent, (unsigned)sec, (unsigned)usec);

printf("Average transfer rate: %g messages/sec\n", throughput);

printf("RTT/2 = %g us\n", (double)1 / throughput / (double)2 * (double)(1000 * 1000));

}

int abortmode;

void sig_handler(int foo)

{

done = 1;

if (verbose)

printf("Alarm\n");

if (abortmode)

exit(1);

}

int main(int argc, char *argv[])

{

int port = 18515;

int size = 1;

int tx_depth = 1;

struct pingpong_context *ctx;

char *servername = NULL;

struct pingpong_dest rem_dest;

struct ibv_qp *qp;

struct ibv_send_wr *wr;

int scnt, rcnt, ccnt;

struct timeval start_time, stop_time;

struct timezone tz;

int poll = 0;

struct ibv_cq *ev_cq;

void *ev_ctx;

int send_inline = 0;

int run_time = 10;

struct ibv_wc wc;

int ne;

int zerobyte = 0;

struct ibv_send_wr *bad_wr;

int count;

int peer2peer = 0;

/* Parameter parsing. */

while (1) {

int c;

static struct option long_options[] = {

{ .name = "port", .has_arg = 1, .val = 'p' },

{ .name = "size", .has_arg = 1, .val = 's' },

{ .name = "tx-depth", .has_arg = 1, .val = 't' },

{ .name = "poll", .has_arg = 0, .val = 'P' },

{ .name = "inline", .has_arg = 0, .val = 'I' },

{ .name = "time", .has_arg = 1, .val = 'T' },

{ .name = "verbose", .has_arg = 0, .val = 'v' },

{ .name = "myserver", .has_arg = 0, .val = 'm' },

{ .name = "abortmode", .has_arg = 0, .val = 'A' },

{ .name = "nortr", .has_arg = 0, .val = 'n' },

{ 0 }

};

c = getopt_long(argc, argv, "nAp:s:t:T:PIv", long_options, NULL);

if (c == -1)

break;

switch (c) {

case 'n':

peer2peer = 1;

break;

case 'A':

abortmode = 1;

break;

case 'm':

myserver = 1;

break;

case 'v':

verbose = 1;

break;

case 'I':

send_inline = IBV_SEND_INLINE;

break;

case 'P':

poll = 1;

break;

case 'p':

port = strtol(optarg, NULL, 0);

if (port < 0 || port > 65535) {

usage(argv[0]);

return 1;

}

break;

case 's':

size = strtol(optarg, NULL, 0);

if (size < 0) { usage(argv[0]); return 3; }

if (size == 0) {

zerobyte=1;

size = 1; /* so we alloc memory ok */

}

break;

case 't':

tx_depth = strtol(optarg, NULL, 0);

if (tx_depth < 1) { usage(argv[0]); return 4; }

break;

case 'T':

run_time = strtol(optarg, NULL, 0);

if (run_time < 0) { usage(argv[0]); return 4; }

break;

default:

usage(argv[0]);

return 5;

}

if (optind == argc - 1)

servername = strdupa(argv[optind]);

else if (optind < argc) {

usage(argv[0]);

return 6;

}

* Done with parameter parsing. Perform setup.

srand48(getpid() * time(NULL));

page_size = sysconf(_SC_PAGESIZE);

struct pingpong_dest my_dest;

memset(&rem_dest, 0, sizeof(rem_dest));

if (servername)

ctx = pp_client_connect_cma(servername, port, size, tx_depth, &my_dest,

&rem_dest);

else

ctx = pp_server_connect_cma(port, size, tx_depth, &my_dest, &rem_dest); //comment1 “server connect with connection management abstraction call”

if (!ctx) {

fprintf(stderr, "pp_connect_cma(%s,%d) failed!\n", servername, port);

return 7;

}

if (verbose) {

printf(" local address: PSN %#06x RKey %#08x VAddr %#016Lx\n",

my_dest.psn, my_dest.rkey, my_dest.vaddr);

printf(" remote address: PSN %#06x RKey %#08x VAddr %#016Lx\n",

rem_dest.psn, rem_dest.rkey, rem_dest.vaddr);

}

wr = &ctx->wr;

ctx->list.addr = (uintptr_t)(ctx->buf + size);

if (zerobyte)

ctx->list.length = 0;

else

ctx->list.length = ctx->size;

ctx->list.lkey = ctx->mr->lkey;

wr->wr_id = PINGPONG_RDMA_WRID;

wr->sg_list = &ctx->list;

wr->num_sge = 1;

wr->opcode = IBV_WR_SEND; //comment15 “iwarp verbs rdma send work request”

wr->send_flags = IBV_SEND_SIGNALED;

if (ctx->size <= 64)

wr->send_flags |= send_inline;

wr->next = NULL;

scnt = 0;

rcnt = 0;

ccnt = 0;

qp = ctx->qp;

if (!poll && ibv_req_notify_cq(ctx->scq, 0)) {

fprintf(stderr, "ibv_req_notify failed!\n");

return 1;

}

if (!poll && ibv_req_notify_cq(ctx->rcq, 0)) {

fprintf(stderr, "ibv_req_notify failed!\n");

return 1;

}

/* Done with setup. Start the test. */

signal(SIGALRM, sig_handler);

alarm(run_time);

gettimeofday(&start_time, &tz);

while (!done) {

if (scnt >= 1 || (peer2peer && !servername) ||

(!peer2peer && servername)) {

int count = tx_depth;

/* Wait for recv completions */

while (!done && count--) {

do {

ne = ibv_poll_cq(ctx->rcq, 1, &wc); //comment16 “iwarp verbs poll completion queue”

if (!poll && ne == 0) {

if (ibv_get_cq_event(ctx->ch, &ev_cq, &ev_ctx)) {

fprintf(stderr, "Failed to get cq event!\n");

return 1;

}

if (ev_cq != ctx->rcq) {

fprintf(stderr, "Unkown CQ!\n");

return 1;

}

ibv_ack_cq_events(ctx->rcq, 1);

ibv_req_notify_cq(ctx->rcq, 0);

}

if (done) break;

} while (ne == 0);

if (ne < 0) {

fprintf(stderr, "poll CQ failed %d\n", ne);

break;

}

if (wc.status != IBV_WC_SUCCESS) {

fprintf(stderr, "Completion wth error at %s:\n",

servername ? "client" : "server");

fprintf(stderr, "Failed status %d: wr_id %d\n",

wc.status, (int) wc.wr_id);

fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",

scnt, rcnt, ccnt);

break;

}

if (done) break;

}

count = tx_depth;

while (!done && count--) {

if (ibv_post_send(qp, wr, &bad_wr)) {//comment17 “iwarp verbs post send”

fprintf(stderr, "Couldn't post send: scnt=%d\n",

scnt);

break;

}

scnt++;

pp_post_recv(ctx, size, 1); //comment18 “iwarp verbs post receive”

++rcnt;

}

while (!done && ccnt < scnt) {

do {

ne = ibv_poll_cq(ctx->scq, 1, &wc); //comment19 “iwarp verbs poll completion queue”

if (ne < 0) {

fprintf(stderr, "poll CQ failed %d\n", ne);

break;

}

} while (ne == 0);

if (ne == 1) {

if (wc.status != IBV_WC_SUCCESS) {

fprintf(stderr, "Completion wth error at %s:\n",

servername ? "client" : "server");

fprintf(stderr, "Failed status %d: wr_id %d\n",

wc.status, (int) wc.wr_id);

fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",

scnt, rcnt, ccnt);

break;

}

++ccnt;

}

gettimeofday(&stop_time, &tz);

//comment20 “finish test server”

if (servername) {

if (verbose)

printf("scnt %u ccnt %u rcnt %u\n", scnt, ccnt, rcnt);

print_report(size, ccnt, &start_time, &stop_time);

if (myserver) {

char *buf;

size_t buflen;

while (getline(&buf, &buflen, stdin) != -1)

printf("server: %s", buf);

}

return 0;

}

//1 “client connect with connection management abstraction call”
//2 “client connect with connection management abstraction function”
//3 “create event channel”
//4 “create connection manager identifier”
//5 “initialize connection manager abstraction context call”
//6 “initialize connection management abstraction context function”
//7 “allocate protection domain”
//8 “allocate memory region”
//9 “create completion channel”
//10 “create receive completion queue”
//11 “create send completion queue”
//12 “create queue pair”
//13 “post receive”
//14 “rdma connect”
//15 “iwarp verbs rdma send work request”
//16 “iwarp verbs poll completion queue”
//17 “iwarp verbs post send”
//18 “iwarp verbs post receive”
//19 “iwarp verbs poll completion queue”
//20 “finish test client”

/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies Ltd.  All rights reserved.
 * Copyright (c) 2005 Hewlett Packard, Inc (Grant Grundler)
 * Copyright (c) 2007 Chelsio Communications, Inc.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or 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 AND
 * 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.
 *
 * $Id$
 */

#if HAVE_CONFIG_H
#  include <config.h>
#endif /* HAVE_CONFIG_H */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netdb.h>
#include <malloc.h>
#include <getopt.h>
#include <arpa/inet.h>
#include <byteswap.h>
#include <time.h>
#include <signal.h>

#include <infiniband/verbs.h>
#include <rdma/rdma_cma.h>

#include "get_clock.h"

#define PINGPONG_RDMA_WRID	3

static int page_size;
static int done;
static int verbose;
static int myserver;

struct report_options {
	int unsorted;
	int histogram;
	int cycles;   /* report delta's in cycles, not microsec's */
};

struct pingpong_context {
	struct ibv_context *context;
	struct ibv_pd      *pd;
	struct ibv_mr      *mr;
	struct ibv_cq      *scq;
	struct ibv_cq      *rcq;
	struct ibv_qp      *qp;
	struct ibv_comp_channel *ch;
	struct rdma_event_channel *rch;
	void               *buf;
	volatile char      *post_buf;
	volatile char      *poll_buf;
	int                 size;
	int                 tx_depth;
	struct ibv_sge list;
	struct ibv_send_wr wr;
	struct rdma_cm_id  *cm_id;
};

struct pingpong_dest {
	int lid;
	int qpn;
	int psn;
	unsigned rkey;
	unsigned long long vaddr;
};

static void pp_post_recv(struct pingpong_context *ctx, int size, int count)
{
	struct ibv_sge list;
	struct ibv_recv_wr wr, *bad_wr;
	int rc;

	list.addr = (uintptr_t) ctx->buf;
	list.length = size;
	list.lkey = ctx->mr->lkey;
	wr.next = NULL;
	wr.wr_id = 0xdead0001;
	wr.sg_list = &list;
	wr.num_sge = 1;
	while (!done && count--) {
		wr.wr_id++;
		rc = ibv_post_recv(ctx->qp, &wr, &bad_wr);
		if (rc) {
			fprintf(stderr, "%s ibv_post_recv failed %d\n", __FUNCTION__, rc);
		}
	}
}

static struct pingpong_context *pp_create_cma_ctx()
{
	struct pingpong_context *ctx;

	ctx = malloc(sizeof *ctx);
	if (!ctx)
		return NULL;
	return ctx;
}

static struct pingpong_context *pp_init_cma_ctx(struct pingpong_context *ctx,
					    struct rdma_cm_id *cm_id,
					    unsigned size,
					    int tx_depth, int port)  //comment6 “initialize connection management abstraction context function”
{
	ctx->size     = size;
	ctx->tx_depth = tx_depth;

	ctx->buf = memalign(page_size, size * 2);
	if (!ctx->buf) {
		fprintf(stderr, "Couldn't allocate work buf.\n");
		return NULL;
	}

	memset(ctx->buf, 0, size * 2);

	ctx->post_buf = (char*)ctx->buf + (size - 1);
	ctx->poll_buf = (char*)ctx->buf + (2 * size - 1);

	ctx->cm_id = cm_id;
	ctx->context = cm_id->verbs;
	if (!ctx->context) {
		fprintf(stderr, "%s Unbound cm_id!!\n", __FUNCTION__);
		return NULL;
	}

	ctx->pd = ibv_alloc_pd(ctx->context); //comment7 “allocate protection domain”
	if (!ctx->pd) {
		fprintf(stderr, "Couldn't allocate PD\n");
		return NULL;
	}

        /* We dont really want IBV_ACCESS_LOCAL_WRITE, but IB spec says:
         * The Consumer is not allowed to assign Remote Write or Remote Atomic to
         * a Memory Region that has not been assigned Local Write. */
	ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size * 2,
			     IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_LOCAL_WRITE); //comment8 “allocate memory region”
	if (!ctx->mr) {
		fprintf(stderr, "Couldn't allocate MR\n");
		return NULL;
	}

	ctx->ch = ibv_create_comp_channel(ctx->context); //comment9 “create completion channel”
	if (!ctx->ch) {
		fprintf(stderr, "Couldn't create comp channel\n");
		return NULL;
	}

	ctx->rcq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment10 “create receive completion queue”
	if (!ctx->rcq) {
		fprintf(stderr, "Couldn't create RCQ\n");
		return NULL;
	}

	ctx->scq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment11 “create send completion queue”
	if (!ctx->scq) {
		fprintf(stderr, "Couldn't create SCQ\n");
		return NULL;
	}

	{
		struct ibv_qp_init_attr attr = {
			.send_cq = ctx->scq,
			.recv_cq = ctx->rcq,
			.cap     = {
				.max_send_wr  = tx_depth,
				.max_recv_wr  = tx_depth*2,
				.max_send_sge = 1,
				.max_recv_sge = 1,
				.max_inline_data = 64,
			},
			.qp_type = IBV_QPT_RC
		};

		if (rdma_create_qp(ctx->cm_id, ctx->pd, &attr)) {//comment12 “create queue pair”
			fprintf(stderr, "Couldn't create QP\n");
			return NULL;
		}
		ctx->qp = ctx->cm_id->qp;
	}

	return ctx;
}

static struct pingpong_context *pp_server_connect_cma(unsigned short port, int size, int tx_depth,
						      struct pingpong_dest *my_dest, 
						      struct pingpong_dest *rem_dest)
{
	struct rdma_cm_id *listen_id;
	struct rdma_cm_event *event;
	struct rdma_conn_param conn_param;
	int ret;
	struct sockaddr_in sin;
	struct rdma_cm_id *child_cm_id;
	struct pingpong_context *ctx;

	ctx = pp_create_cma_ctx();
	if (!ctx) {
		fprintf(stderr, "Couldn't create cma context\n");
		return NULL;
	}

	ctx->rch = rdma_create_event_channel();
	if (!ctx->rch) {
		fprintf(stderr, "Couldn't create RDMA event channel\n");
		return NULL;
	}

	ret = rdma_create_id(ctx->rch, &listen_id, NULL, RDMA_PS_TCP);
	if (ret) {
		fprintf(stderr, "%s rdma_create_id failed %d\n", __FUNCTION__, ret);
		return NULL;
	}

	sin.sin_addr.s_addr = 0;
	sin.sin_family = PF_INET;
	sin.sin_port = htons(port);
	ret = rdma_bind_addr(listen_id, (struct sockaddr *)&sin);
	if (ret) {
		fprintf(stderr,"%s rdma_bind_addr failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_listen(listen_id, 0);
	if (ret) {
		fprintf(stderr,"%s rdma_listen failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	if (myserver) {
		printf("SERVER READY");
		fflush(stdout);
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_CONNECT_REQUEST) {
		fprintf(stderr,"%s bad event waiting for connect request %d\n", __FUNCTION__, 
		       event->event);
		goto err1;
	}

	if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {
		ret = 1;
		fprintf(stderr,"%s bad private data len %d\n", __FUNCTION__, 
		       event->param.conn.private_data_len);
		goto err1;
	}
#if 0
	if (event->param.conn.private_data_len != sizeof(*rem_dest)) {
		fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n", 
			__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));
	}
#endif
	memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));
	child_cm_id = (struct rdma_cm_id *)event->id;
	ctx = pp_init_cma_ctx(ctx, child_cm_id, size, tx_depth, port);

	if (!ctx) {
		fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);
		goto err0;
	}

	my_dest->qpn = 0;
	my_dest->psn = 0xbb;
	my_dest->rkey = ctx->mr->rkey;
	my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;
	memset(&conn_param, 0, sizeof conn_param);
	conn_param.responder_resources = 1;
	conn_param.initiator_depth = 1;
	conn_param.private_data = my_dest;
	conn_param.private_data_len = sizeof(*my_dest);
	pp_post_recv(ctx, size, tx_depth);
	ret = rdma_accept(ctx->cm_id, &conn_param);
	if (ret) {
		fprintf(stderr,"%s rdma_accept failed %d\n", __FUNCTION__, ret);
		goto err0;
	}
	rdma_ack_cm_event(event);
	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) {
		fprintf(stderr,"rdma_get_cm_event error %d\n", ret);
		rdma_destroy_id(child_cm_id);
		goto err2;
	}
	if (event->event != RDMA_CM_EVENT_ESTABLISHED) {
		fprintf(stderr,"%s bad event waiting for established %d\n", __FUNCTION__, 
		       event->event);
		goto err0;
	}
	rdma_ack_cm_event(event);
	return ctx;
err0:
	rdma_destroy_id(child_cm_id);
err1:
	rdma_ack_cm_event(event);
err2:
	rdma_destroy_id(listen_id);
	fprintf(stderr,"%s NOT connected!\n", __FUNCTION__);
	return NULL;
}

static unsigned get_dst_addr(const char *dst)
{
	struct addrinfo *res;
	int ret;
	unsigned addr;

	ret = getaddrinfo(dst, NULL, NULL, &res);
	if (ret) {
		fprintf(stderr, "%s getaddrinfo failed - invalid hostname or IP address\n",
			__FUNCTION__);
		return 0;
	}

	if (res->ai_family != PF_INET) {
		return 0;
	}

	addr = ((struct sockaddr_in*)res->ai_addr)->sin_addr.s_addr;
	freeaddrinfo(res);
	return addr;
}

static struct pingpong_context *pp_client_connect_cma(const char *servername, 
						      unsigned short port, int size, int tx_depth, 
						      struct pingpong_dest *my_dest, 
						      struct pingpong_dest *rem_dest) //comment2 “client connect with connection management abstraction function”
{
	struct rdma_cm_event *event;
	struct rdma_conn_param conn_param;
	int ret;
	struct sockaddr_in sin;
	struct rdma_cm_id *cm_id;
	struct pingpong_context *ctx;

	sin.sin_addr.s_addr = get_dst_addr(servername);
	if (!sin.sin_addr.s_addr) {
		return NULL;
	}

	ctx = pp_create_cma_ctx();
	if (!ctx) {
		fprintf(stderr, "Couldn't create cma context\n");
		return NULL;
	}

	ctx->rch = rdma_create_event_channel();//comment3 “create event channel”
	if (!ctx->rch) {
		fprintf(stderr, "Couldn't create RDMA event channel\n");
		return NULL;
	}

	ret = rdma_create_id(ctx->rch, &cm_id, NULL, RDMA_PS_TCP); //comment4 “create connection manager identifier”
	if (ret) {
		fprintf(stderr,"%s rdma_create_id failed %d\n", __FUNCTION__, ret);
		return NULL;
	}

	sin.sin_family = PF_INET;
	sin.sin_port = htons(port);
	ret = rdma_resolve_addr(cm_id, NULL, (struct sockaddr *)&sin, 2000);
	if (ret) {
		fprintf(stderr,"%s rdma_resolve_addr failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_ADDR_RESOLVED) {
		fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,
		       event->event);
		goto err1;
	}
	rdma_ack_cm_event(event);

	ret = rdma_resolve_route(cm_id, 2000);
	if (ret) {
		fprintf(stderr,"%s rdma_resolve_route failed %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) {
		fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,
		       event->event);
		goto err1;
	}
	rdma_ack_cm_event(event);

	ctx = pp_init_cma_ctx(ctx, cm_id, size, tx_depth, port); //comment5 “initialize connection manager abstraction context call”

	if (!ctx) {
		fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);
		goto err2;
	}

	my_dest->qpn = 0;
	my_dest->psn = 0xaa;
	my_dest->rkey = ctx->mr->rkey;
	my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;
	memset(&conn_param, 0, sizeof conn_param);
	conn_param.responder_resources = 1;
	conn_param.initiator_depth = 1;
	conn_param.retry_count = 5;
	conn_param.private_data = my_dest;
	conn_param.private_data_len = sizeof(*my_dest);
	pp_post_recv(ctx, size, tx_depth*2); //comment13 “post receive”
	ret = rdma_connect(ctx->cm_id, &conn_param);  //comment14 “rdma connect”
	if (ret) {
		fprintf(stderr,"%s rdma_connect failure %d\n", __FUNCTION__, ret);
		goto err2;
	}

	ret = rdma_get_cm_event(ctx->rch, &event);
	if (ret) 
		goto err2;

	if (event->event != RDMA_CM_EVENT_ESTABLISHED) {
		fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,
		       event->event);
		goto err1;
	}
	if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {
		fprintf(stderr,"%s bad private data ptr %p len %d\n", __FUNCTION__,
		       event->param.conn.private_data, event->param.conn.private_data_len);
		goto err1;
	}
#if 0
	if (event->param.conn.private_data_len != sizeof(*rem_dest)) {
		fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n", 
			__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));
	}
#endif
	memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));
	rdma_ack_cm_event(event);
	return ctx;
err1:
	rdma_ack_cm_event(event);
err2:
	fprintf(stderr,"NOT connected!\n");
	rdma_destroy_id(cm_id);
	return NULL;
}

static void usage(const char *argv0)
{
	printf("Usage:\n");
	printf("  %s            start a server and wait for connection\n", argv0);
	printf("  %s <host>     connect to server at <host>\n", argv0);
	printf("\n");
	printf("Options:\n");
	printf("  -p, --port=<port>      listen on/connect to port <port> (default 18515)\n");
	printf("  -s, --size=<size>      size of message to exchange (default 1)\n");
	printf("  -t, --tx-depth=<dep>   size of tx queue (default 1)\n");
	printf("  -P, --poll    	 Spin polling for completions (default is blocking)\n");
	printf("  -I, --inline    	 Use IBV_SEND_INLINE (default no inline)\n");
	printf("  -T, --time=<secs>    	 Run test for <secs> seconds (default is 10)\n");
	printf("  -v, --verbose    	 be verbose.\n");
	printf("  -A, --abortmode	 abort instead of graceful close\n");
	printf("  -n, --nortr	 	 server starts test (no rtr)\n");
}

static void print_report(int size, int iters, struct timeval *start_time, struct timeval *stop_time)
{
	time_t sec;
	suseconds_t usec;
	float elapsed;
	double bytes_sent = 2 * size * iters;
	double throughput;

	if (stop_time->tv_usec < start_time->tv_usec) {
		stop_time->tv_usec += 1000000;
		stop_time->tv_sec  -= 1;
	}
	sec     = stop_time->tv_sec - start_time->tv_sec;
	usec    = stop_time->tv_usec - start_time->tv_usec;
	elapsed = (float)sec + ((float)usec/(float)1000000.0);
	throughput = iters / elapsed;

	printf("Bytes %g elapsed sec %d usec %d\n", bytes_sent, (unsigned)sec, (unsigned)usec);
	printf("Average transfer rate: %g messages/sec\n", throughput);
	printf("RTT/2 = %g us\n", (double)1 / throughput / (double)2 * (double)(1000 * 1000));
}

int abortmode;

void sig_handler(int foo)
{
	done = 1;
	if (verbose)
		printf("Alarm\n");
	if (abortmode)
		exit(1);
}

int main(int argc, char *argv[])
{
	int                      port = 18515;
	int                      size = 1;
	int                      tx_depth = 1;
	struct pingpong_context *ctx;
	char                    *servername = NULL;
	struct pingpong_dest     rem_dest;
	struct ibv_qp           *qp;
	struct ibv_send_wr      *wr;
	int                      scnt, rcnt, ccnt;
	struct timeval		 start_time, stop_time;
	struct timezone	 	 tz;
	int			 poll = 0;
	struct ibv_cq 		*ev_cq;
	void 			*ev_ctx;
	int 			send_inline = 0;
	int 			run_time = 10;
	struct 			ibv_wc wc;
	int 			ne;
	int			zerobyte = 0;
	struct ibv_send_wr 	*bad_wr;
	int 			count;
	int			peer2peer = 0;

	/* Parameter parsing. */
	while (1) {
		int c;

		static struct option long_options[] = {
			{ .name = "port",           .has_arg = 1, .val = 'p' },
			{ .name = "size",           .has_arg = 1, .val = 's' },
			{ .name = "tx-depth",       .has_arg = 1, .val = 't' },
			{ .name = "poll", 	    .has_arg = 0, .val = 'P' },
			{ .name = "inline", 	    .has_arg = 0, .val = 'I' },
			{ .name = "time",           .has_arg = 1, .val = 'T' },
			{ .name = "verbose",        .has_arg = 0, .val = 'v' },
			{ .name = "myserver",	    .has_arg = 0, .val = 'm' },
			{ .name = "abortmode",	    .has_arg = 0, .val = 'A' },
			{ .name = "nortr",	    .has_arg = 0, .val = 'n' },
			{ 0 }
		};

		c = getopt_long(argc, argv, "nAp:s:t:T:PIv", long_options, NULL);
		if (c == -1)
			break;

		switch (c) {

		case 'n':
			peer2peer = 1;
			break;

		case 'A':
			abortmode = 1;
			break;

		case 'm':
			myserver = 1;
			break;

		case 'v':
			verbose = 1;
			break;

		case 'I':
			send_inline = IBV_SEND_INLINE;
			break;

		case 'P':
			poll = 1;
			break;

		case 'p':
			port = strtol(optarg, NULL, 0);
			if (port < 0 || port > 65535) {
				usage(argv[0]);
				return 1;
			}
			break;

		case 's':
			size = strtol(optarg, NULL, 0);
			if (size < 0) { usage(argv[0]); return 3; }
			if (size == 0) {
				zerobyte=1;
				size = 1; /* so we alloc memory ok */
			}
			break;

		case 't':
			tx_depth = strtol(optarg, NULL, 0);
			if (tx_depth < 1) { usage(argv[0]); return 4; }
			break;

		case 'T':
			run_time = strtol(optarg, NULL, 0);
			if (run_time < 0) { usage(argv[0]); return 4; }
			break;

		default:
			usage(argv[0]);
			return 5;
		}
	}

	if (optind == argc - 1)
		servername = strdupa(argv[optind]);
	else if (optind < argc) {
		usage(argv[0]);
		return 6;
	}

	/*
	 *  Done with parameter parsing. Perform setup.
	 */

	srand48(getpid() * time(NULL));
	page_size = sysconf(_SC_PAGESIZE);

	struct pingpong_dest my_dest;

	memset(&rem_dest, 0, sizeof(rem_dest));

	if (servername)
		ctx = pp_client_connect_cma(servername, port, size, tx_depth, &my_dest, 
					    &rem_dest);  //comment1 “client connect with connection management abstraction call”
	else
		ctx = pp_server_connect_cma(port, size, tx_depth, &my_dest, &rem_dest);
	if (!ctx) {
		fprintf(stderr, "pp_connect_cma(%s,%d) failed!\n", servername, port);
		return 7;
	}

	if (verbose) {
		printf("  local address:  PSN %#06x RKey %#08x VAddr %#016Lx\n",
			my_dest.psn, my_dest.rkey, my_dest.vaddr);
		printf("  remote address: PSN %#06x RKey %#08x VAddr %#016Lx\n",
			rem_dest.psn, rem_dest.rkey, rem_dest.vaddr);
	}
	wr = &ctx->wr;
	ctx->list.addr = (uintptr_t)(ctx->buf + size);
	if (zerobyte)
		ctx->list.length = 0;
	else
		ctx->list.length = ctx->size; 
	ctx->list.lkey = ctx->mr->lkey;
	wr->wr_id      = PINGPONG_RDMA_WRID;
	wr->sg_list    = &ctx->list;
	wr->num_sge    = 1;
	wr->opcode     = IBV_WR_SEND;  //comment15 “iwarp verbs rdma send work request”
	wr->send_flags = IBV_SEND_SIGNALED;
	if (ctx->size <= 64) 
		wr->send_flags |= send_inline;
	wr->next       = NULL;

	scnt = 0;
	rcnt = 0;
	ccnt = 0;
	qp = ctx->qp;

	if (!poll && ibv_req_notify_cq(ctx->scq, 0)) {
		fprintf(stderr, "ibv_req_notify failed!\n");
		return 1;
	}
	if (!poll && ibv_req_notify_cq(ctx->rcq, 0)) {
		fprintf(stderr, "ibv_req_notify failed!\n");
		return 1;
	}

	/* Done with setup. Start the test. */

	signal(SIGALRM, sig_handler);
	alarm(run_time);
	gettimeofday(&start_time, &tz);
	while (!done) {

		if (scnt >= 1 || (peer2peer && !servername) ||
		    (!peer2peer &&  servername)) {
			int count = tx_depth;

			/* Wait for recv completions */
			while (!done && count--) {
				do {
					ne = ibv_poll_cq(ctx->rcq, 1, &wc);  //comment16 “iwarp verbs poll completion queue”
					if (!poll && ne == 0) {
						if (ibv_get_cq_event(ctx->ch, &ev_cq, &ev_ctx)) {
							fprintf(stderr, "Failed to get cq event!\n");
							return 1;
						}
						if (ev_cq != ctx->rcq) {
							fprintf(stderr, "Unkown CQ!\n");
							return 1;
						}
						ibv_ack_cq_events(ctx->rcq, 1);
						ibv_req_notify_cq(ctx->rcq, 0);
					}
					if (done) break;
				} while (ne == 0);
				if (ne < 0) {
					fprintf(stderr, "poll CQ failed %d\n", ne);
					break;
				}
				if (wc.status != IBV_WC_SUCCESS) {
					fprintf(stderr, "Completion wth error at %s:\n",
						servername ? "client" : "server");
					fprintf(stderr, "Failed status %d: wr_id %d\n",
						wc.status, (int) wc.wr_id);
					fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",
						scnt, rcnt, ccnt);
					break;
				}
				if (done) break;
			}
		}

		count = tx_depth;
		while (!done && count--) {
			if (ibv_post_send(qp, wr, &bad_wr)) {  //comment17 “iwarp verbs post send”
				fprintf(stderr, "Couldn't post send: scnt=%d\n",
					scnt);
				break;
			}
			scnt++;
			pp_post_recv(ctx, size, 1);  //comment18 “iwarp verbs post receive”
			++rcnt;
		}

		while (!done && ccnt < scnt) {
			do {
				ne = ibv_poll_cq(ctx->scq, 1, &wc);  //comment19 “iwarp verbs poll completion queue”
				if (ne < 0) {
					fprintf(stderr, "poll CQ failed %d\n", ne);
					break;
				}
			} while (ne == 0);
			if (ne == 1) {
				if (wc.status != IBV_WC_SUCCESS) {
					fprintf(stderr, "Completion wth error at %s:\n",
						servername ? "client" : "server");
					fprintf(stderr, "Failed status %d: wr_id %d\n",
						wc.status, (int) wc.wr_id);
					fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",
						scnt, rcnt, ccnt);
					break;
				}
				++ccnt;
			}
		}
	}
	gettimeofday(&stop_time, &tz);

//comment20 “finish test client”
	if (servername) {
		if (verbose)
			printf("scnt %u ccnt %u rcnt %u\n", scnt, ccnt, rcnt);
		print_report(size, ccnt, &start_time, &stop_time);
		if (myserver) {
			char *buf;
			size_t buflen;
			while (getline(&buf, &buflen, stdin) != -1)
				printf("server: %s", buf);
		}
	}
	return 0;
}

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//1 “client connect with connection management abstraction call”

//2 “client connect with connection management abstraction function”

//3 “create event channel”

//4 “create connection manager identifier”

//5 “initialize connection manager abstraction context call”

//6 “initialize connection management abstraction context function”

//7 “allocate protection domain”

//8 “allocate memory region”

//9 “create completion channel”

//10 “create receive completion queue”

//11 “create send completion queue”

//12 “create queue pair”

//13 “post receive”

//14 “rdma connect”

//15 “iwarp verbs rdma send work request”

//16 “iwarp verbs poll completion queue”

//17 “iwarp verbs post send”

//18 “iwarp verbs post receive”

//19 “iwarp verbs poll completion queue”

//20 “finish test client”

* This software is available to you under a choice of one of two

* licenses. You may choose to be licensed under the terms of the GNU

* General Public License (GPL) Version 2, available from the file

* COPYING in the main directory of this source tree, or 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 AND

* 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.

* $Id$

#if HAVE_CONFIG_H

# include <config.h>

#endif /* HAVE_CONFIG_H */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <netdb.h>

#include <malloc.h>

#include <getopt.h>

#include <arpa/inet.h>

#include <byteswap.h>

#include <time.h>

#include <signal.h>

#include <infiniband/verbs.h>

#include <rdma/rdma_cma.h>

#include "get_clock.h"

#define PINGPONG_RDMA_WRID 3

static int page_size;

static int done;

static int verbose;

static int myserver;

struct report_options {

int unsorted;

int histogram;

int cycles; /* report delta's in cycles, not microsec's */

};

struct pingpong_context {

struct ibv_context *context;

struct ibv_pd *pd;

struct ibv_mr *mr;

struct ibv_cq *scq;

struct ibv_cq *rcq;

struct ibv_qp *qp;

struct ibv_comp_channel *ch;

struct rdma_event_channel *rch;

void *buf;

volatile char *post_buf;

volatile char *poll_buf;

int size;

int tx_depth;

struct ibv_sge list;

struct ibv_send_wr wr;

struct rdma_cm_id *cm_id;

};

struct pingpong_dest {

int lid;

int qpn;

int psn;

unsigned rkey;

unsigned long long vaddr;

};

static void pp_post_recv(struct pingpong_context *ctx, int size, int count)

{

struct ibv_sge list;

struct ibv_recv_wr wr, *bad_wr;

int rc;

list.addr = (uintptr_t) ctx->buf;

list.length = size;

list.lkey = ctx->mr->lkey;

wr.next = NULL;

wr.wr_id = 0xdead0001;

wr.sg_list = &list;

wr.num_sge = 1;

while (!done && count--) {

wr.wr_id++;

rc = ibv_post_recv(ctx->qp, &wr, &bad_wr);

if (rc) {

fprintf(stderr, "%s ibv_post_recv failed %d\n", __FUNCTION__, rc);

}

static struct pingpong_context *pp_create_cma_ctx()

{

struct pingpong_context *ctx;

ctx = malloc(sizeof *ctx);

if (!ctx)

return NULL;

return ctx;

}

static struct pingpong_context *pp_init_cma_ctx(struct pingpong_context *ctx,

struct rdma_cm_id *cm_id,

unsigned size,

int tx_depth, int port) //comment6 “initialize connection management abstraction context function”

{

ctx->size = size;

ctx->tx_depth = tx_depth;

ctx->buf = memalign(page_size, size * 2);

if (!ctx->buf) {

fprintf(stderr, "Couldn't allocate work buf.\n");

return NULL;

}

memset(ctx->buf, 0, size * 2);

ctx->post_buf = (char*)ctx->buf + (size - 1);

ctx->poll_buf = (char*)ctx->buf + (2 * size - 1);

ctx->cm_id = cm_id;

ctx->context = cm_id->verbs;

if (!ctx->context) {

fprintf(stderr, "%s Unbound cm_id!!\n", __FUNCTION__);

return NULL;

}

ctx->pd = ibv_alloc_pd(ctx->context); //comment7 “allocate protection domain”

if (!ctx->pd) {

fprintf(stderr, "Couldn't allocate PD\n");

return NULL;

}

/* We dont really want IBV_ACCESS_LOCAL_WRITE, but IB spec says:

* The Consumer is not allowed to assign Remote Write or Remote Atomic to

* a Memory Region that has not been assigned Local Write. */

ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size * 2,

IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_LOCAL_WRITE); //comment8 “allocate memory region”

if (!ctx->mr) {

fprintf(stderr, "Couldn't allocate MR\n");

return NULL;

}

ctx->ch = ibv_create_comp_channel(ctx->context); //comment9 “create completion channel”

if (!ctx->ch) {

fprintf(stderr, "Couldn't create comp channel\n");

return NULL;

}

ctx->rcq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment10 “create receive completion queue”

if (!ctx->rcq) {

fprintf(stderr, "Couldn't create RCQ\n");

return NULL;

}

ctx->scq = ibv_create_cq(ctx->context, tx_depth, ctx, ctx->ch, 0); //comment11 “create send completion queue”

if (!ctx->scq) {

fprintf(stderr, "Couldn't create SCQ\n");

return NULL;

}

{

struct ibv_qp_init_attr attr = {

.send_cq = ctx->scq,

.recv_cq = ctx->rcq,

.cap = {

.max_send_wr = tx_depth,

.max_recv_wr = tx_depth*2,

.max_send_sge = 1,

.max_recv_sge = 1,

.max_inline_data = 64,

.qp_type = IBV_QPT_RC

};

if (rdma_create_qp(ctx->cm_id, ctx->pd, &attr)) {//comment12 “create queue pair”

fprintf(stderr, "Couldn't create QP\n");

return NULL;

}

ctx->qp = ctx->cm_id->qp;

}

return ctx;

}

static struct pingpong_context *pp_server_connect_cma(unsigned short port, int size, int tx_depth,

struct pingpong_dest *my_dest,

struct pingpong_dest *rem_dest)

{

struct rdma_cm_id *listen_id;

struct rdma_cm_event *event;

struct rdma_conn_param conn_param;

int ret;

struct sockaddr_in sin;

struct rdma_cm_id *child_cm_id;

struct pingpong_context *ctx;

ctx = pp_create_cma_ctx();

if (!ctx) {

fprintf(stderr, "Couldn't create cma context\n");

return NULL;

}

ctx->rch = rdma_create_event_channel();

if (!ctx->rch) {

fprintf(stderr, "Couldn't create RDMA event channel\n");

return NULL;

}

ret = rdma_create_id(ctx->rch, &listen_id, NULL, RDMA_PS_TCP);

if (ret) {

fprintf(stderr, "%s rdma_create_id failed %d\n", __FUNCTION__, ret);

return NULL;

}

sin.sin_addr.s_addr = 0;

sin.sin_family = PF_INET;

sin.sin_port = htons(port);

ret = rdma_bind_addr(listen_id, (struct sockaddr *)&sin);

if (ret) {

fprintf(stderr,"%s rdma_bind_addr failed %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_listen(listen_id, 0);

if (ret) {

fprintf(stderr,"%s rdma_listen failed %d\n", __FUNCTION__, ret);

goto err2;

}

if (myserver) {

printf("SERVER READY");

fflush(stdout);

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_CONNECT_REQUEST) {

fprintf(stderr,"%s bad event waiting for connect request %d\n", __FUNCTION__,

event->event);

goto err1;

}

if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {

ret = 1;

fprintf(stderr,"%s bad private data len %d\n", __FUNCTION__,

event->param.conn.private_data_len);

goto err1;

}

#if 0

if (event->param.conn.private_data_len != sizeof(*rem_dest)) {

fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n",

__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));

}

#endif

memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));

child_cm_id = (struct rdma_cm_id *)event->id;

ctx = pp_init_cma_ctx(ctx, child_cm_id, size, tx_depth, port);

if (!ctx) {

fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);

goto err0;

}

my_dest->qpn = 0;

my_dest->psn = 0xbb;

my_dest->rkey = ctx->mr->rkey;

my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;

memset(&conn_param, 0, sizeof conn_param);

conn_param.responder_resources = 1;

conn_param.initiator_depth = 1;

conn_param.private_data = my_dest;

conn_param.private_data_len = sizeof(*my_dest);

pp_post_recv(ctx, size, tx_depth);

ret = rdma_accept(ctx->cm_id, &conn_param);

if (ret) {

fprintf(stderr,"%s rdma_accept failed %d\n", __FUNCTION__, ret);

goto err0;

}

rdma_ack_cm_event(event);

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret) {

fprintf(stderr,"rdma_get_cm_event error %d\n", ret);

rdma_destroy_id(child_cm_id);

goto err2;

}

if (event->event != RDMA_CM_EVENT_ESTABLISHED) {

fprintf(stderr,"%s bad event waiting for established %d\n", __FUNCTION__,

event->event);

goto err0;

}

rdma_ack_cm_event(event);

return ctx;

err0:

rdma_destroy_id(child_cm_id);

err1:

rdma_ack_cm_event(event);

err2:

rdma_destroy_id(listen_id);

fprintf(stderr,"%s NOT connected!\n", __FUNCTION__);

return NULL;

}

static unsigned get_dst_addr(const char *dst)

{

struct addrinfo *res;

int ret;

unsigned addr;

ret = getaddrinfo(dst, NULL, NULL, &res);

if (ret) {

fprintf(stderr, "%s getaddrinfo failed - invalid hostname or IP address\n",

__FUNCTION__);

return 0;

}

if (res->ai_family != PF_INET) {

return 0;

}

addr = ((struct sockaddr_in*)res->ai_addr)->sin_addr.s_addr;

freeaddrinfo(res);

return addr;

}

static struct pingpong_context *pp_client_connect_cma(const char *servername,

unsigned short port, int size, int tx_depth,

struct pingpong_dest *my_dest,

struct pingpong_dest *rem_dest) //comment2 “client connect with connection management abstraction function”

{

struct rdma_cm_event *event;

struct rdma_conn_param conn_param;

int ret;

struct sockaddr_in sin;

struct rdma_cm_id *cm_id;

struct pingpong_context *ctx;

sin.sin_addr.s_addr = get_dst_addr(servername);

if (!sin.sin_addr.s_addr) {

return NULL;

}

ctx = pp_create_cma_ctx();

if (!ctx) {

fprintf(stderr, "Couldn't create cma context\n");

return NULL;

}

ctx->rch = rdma_create_event_channel();//comment3 “create event channel”

if (!ctx->rch) {

fprintf(stderr, "Couldn't create RDMA event channel\n");

return NULL;

}

ret = rdma_create_id(ctx->rch, &cm_id, NULL, RDMA_PS_TCP); //comment4 “create connection manager identifier”

if (ret) {

fprintf(stderr,"%s rdma_create_id failed %d\n", __FUNCTION__, ret);

return NULL;

}

sin.sin_family = PF_INET;

sin.sin_port = htons(port);

ret = rdma_resolve_addr(cm_id, NULL, (struct sockaddr *)&sin, 2000);

if (ret) {

fprintf(stderr,"%s rdma_resolve_addr failed %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_ADDR_RESOLVED) {

fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,

event->event);

goto err1;

}

rdma_ack_cm_event(event);

ret = rdma_resolve_route(cm_id, 2000);

if (ret) {

fprintf(stderr,"%s rdma_resolve_route failed %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) {

fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,

event->event);

goto err1;

}

rdma_ack_cm_event(event);

ctx = pp_init_cma_ctx(ctx, cm_id, size, tx_depth, port); //comment5 “initialize connection manager abstraction context call”

if (!ctx) {

fprintf(stderr,"%s pp_init_cma_ctx failed\n", __FUNCTION__);

goto err2;

}

my_dest->qpn = 0;

my_dest->psn = 0xaa;

my_dest->rkey = ctx->mr->rkey;

my_dest->vaddr = (uintptr_t)ctx->buf + ctx->size;

memset(&conn_param, 0, sizeof conn_param);

conn_param.responder_resources = 1;

conn_param.initiator_depth = 1;

conn_param.retry_count = 5;

conn_param.private_data = my_dest;

conn_param.private_data_len = sizeof(*my_dest);

pp_post_recv(ctx, size, tx_depth*2); //comment13 “post receive”

ret = rdma_connect(ctx->cm_id, &conn_param); //comment14 “rdma connect”

if (ret) {

fprintf(stderr,"%s rdma_connect failure %d\n", __FUNCTION__, ret);

goto err2;

}

ret = rdma_get_cm_event(ctx->rch, &event);

if (ret)

goto err2;

if (event->event != RDMA_CM_EVENT_ESTABLISHED) {

fprintf(stderr,"%s/%d unexpected CM event %d\n", __FUNCTION__, __LINE__,

event->event);

goto err1;

}

if (!event->param.conn.private_data || (event->param.conn.private_data_len < sizeof(*rem_dest))) {

fprintf(stderr,"%s bad private data ptr %p len %d\n", __FUNCTION__,

event->param.conn.private_data, event->param.conn.private_data_len);

goto err1;

}

#if 0

if (event->param.conn.private_data_len != sizeof(*rem_dest)) {

fprintf(stderr, "%s - warning: private data is %d bytes, expected %d bytes\n",

__FUNCTION__, event->param.conn.private_data_len, (int)sizeof(*rem_dest));

}

#endif

memcpy(rem_dest, event->param.conn.private_data, sizeof(*rem_dest));

rdma_ack_cm_event(event);

return ctx;

err1:

rdma_ack_cm_event(event);

err2:

fprintf(stderr,"NOT connected!\n");

rdma_destroy_id(cm_id);

return NULL;

}

static void usage(const char *argv0)

{

printf("Usage:\n");

printf(" %s start a server and wait for connection\n", argv0);

printf(" %s <host> connect to server at <host>\n", argv0);

printf("\n");

printf("Options:\n");

printf(" -p, --port=<port> listen on/connect to port <port> (default 18515)\n");

printf(" -s, --size=<size> size of message to exchange (default 1)\n");

printf(" -t, --tx-depth=<dep> size of tx queue (default 1)\n");

printf(" -P, --poll Spin polling for completions (default is blocking)\n");

printf(" -I, --inline Use IBV_SEND_INLINE (default no inline)\n");

printf(" -T, --time=<secs> Run test for <secs> seconds (default is 10)\n");

printf(" -v, --verbose be verbose.\n");

printf(" -A, --abortmode abort instead of graceful close\n");

printf(" -n, --nortr server starts test (no rtr)\n");

}

static void print_report(int size, int iters, struct timeval *start_time, struct timeval *stop_time)

{

time_t sec;

suseconds_t usec;

float elapsed;

double bytes_sent = 2 * size * iters;

double throughput;

if (stop_time->tv_usec < start_time->tv_usec) {

stop_time->tv_usec += 1000000;

stop_time->tv_sec -= 1;

}

sec = stop_time->tv_sec - start_time->tv_sec;

usec = stop_time->tv_usec - start_time->tv_usec;

elapsed = (float)sec + ((float)usec/(float)1000000.0);

throughput = iters / elapsed;

printf("Bytes %g elapsed sec %d usec %d\n", bytes_sent, (unsigned)sec, (unsigned)usec);

printf("Average transfer rate: %g messages/sec\n", throughput);

printf("RTT/2 = %g us\n", (double)1 / throughput / (double)2 * (double)(1000 * 1000));

}

int abortmode;

void sig_handler(int foo)

{

done = 1;

if (verbose)

printf("Alarm\n");

if (abortmode)

exit(1);

}

int main(int argc, char *argv[])

{

int port = 18515;

int size = 1;

int tx_depth = 1;

struct pingpong_context *ctx;

char *servername = NULL;

struct pingpong_dest rem_dest;

struct ibv_qp *qp;

struct ibv_send_wr *wr;

int scnt, rcnt, ccnt;

struct timeval start_time, stop_time;

struct timezone tz;

int poll = 0;

struct ibv_cq *ev_cq;

void *ev_ctx;

int send_inline = 0;

int run_time = 10;

struct ibv_wc wc;

int ne;

int zerobyte = 0;

struct ibv_send_wr *bad_wr;

int count;

int peer2peer = 0;

/* Parameter parsing. */

while (1) {

int c;

static struct option long_options[] = {

{ .name = "port", .has_arg = 1, .val = 'p' },

{ .name = "size", .has_arg = 1, .val = 's' },

{ .name = "tx-depth", .has_arg = 1, .val = 't' },

{ .name = "poll", .has_arg = 0, .val = 'P' },

{ .name = "inline", .has_arg = 0, .val = 'I' },

{ .name = "time", .has_arg = 1, .val = 'T' },

{ .name = "verbose", .has_arg = 0, .val = 'v' },

{ .name = "myserver", .has_arg = 0, .val = 'm' },

{ .name = "abortmode", .has_arg = 0, .val = 'A' },

{ .name = "nortr", .has_arg = 0, .val = 'n' },

{ 0 }

};

c = getopt_long(argc, argv, "nAp:s:t:T:PIv", long_options, NULL);

if (c == -1)

break;

switch (c) {

case 'n':

peer2peer = 1;

break;

case 'A':

abortmode = 1;

break;

case 'm':

myserver = 1;

break;

case 'v':

verbose = 1;

break;

case 'I':

send_inline = IBV_SEND_INLINE;

break;

case 'P':

poll = 1;

break;

case 'p':

port = strtol(optarg, NULL, 0);

if (port < 0 || port > 65535) {

usage(argv[0]);

return 1;

}

break;

case 's':

size = strtol(optarg, NULL, 0);

if (size < 0) { usage(argv[0]); return 3; }

if (size == 0) {

zerobyte=1;

size = 1; /* so we alloc memory ok */

}

break;

case 't':

tx_depth = strtol(optarg, NULL, 0);

if (tx_depth < 1) { usage(argv[0]); return 4; }

break;

case 'T':

run_time = strtol(optarg, NULL, 0);

if (run_time < 0) { usage(argv[0]); return 4; }

break;

default:

usage(argv[0]);

return 5;

}

if (optind == argc - 1)

servername = strdupa(argv[optind]);

else if (optind < argc) {

usage(argv[0]);

return 6;

}

* Done with parameter parsing. Perform setup.

srand48(getpid() * time(NULL));

page_size = sysconf(_SC_PAGESIZE);

struct pingpong_dest my_dest;

memset(&rem_dest, 0, sizeof(rem_dest));

if (servername)

ctx = pp_client_connect_cma(servername, port, size, tx_depth, &my_dest,

&rem_dest); //comment1 “client connect with connection management abstraction call”

else

ctx = pp_server_connect_cma(port, size, tx_depth, &my_dest, &rem_dest);

if (!ctx) {

fprintf(stderr, "pp_connect_cma(%s,%d) failed!\n", servername, port);

return 7;

}

if (verbose) {

printf(" local address: PSN %#06x RKey %#08x VAddr %#016Lx\n",

my_dest.psn, my_dest.rkey, my_dest.vaddr);

printf(" remote address: PSN %#06x RKey %#08x VAddr %#016Lx\n",

rem_dest.psn, rem_dest.rkey, rem_dest.vaddr);

}

wr = &ctx->wr;

ctx->list.addr = (uintptr_t)(ctx->buf + size);

if (zerobyte)

ctx->list.length = 0;

else

ctx->list.length = ctx->size;

ctx->list.lkey = ctx->mr->lkey;

wr->wr_id = PINGPONG_RDMA_WRID;

wr->sg_list = &ctx->list;

wr->num_sge = 1;

wr->opcode = IBV_WR_SEND; //comment15 “iwarp verbs rdma send work request”

wr->send_flags = IBV_SEND_SIGNALED;

if (ctx->size <= 64)

wr->send_flags |= send_inline;

wr->next = NULL;

scnt = 0;

rcnt = 0;

ccnt = 0;

qp = ctx->qp;

if (!poll && ibv_req_notify_cq(ctx->scq, 0)) {

fprintf(stderr, "ibv_req_notify failed!\n");

return 1;

}

if (!poll && ibv_req_notify_cq(ctx->rcq, 0)) {

fprintf(stderr, "ibv_req_notify failed!\n");

return 1;

}

/* Done with setup. Start the test. */

signal(SIGALRM, sig_handler);

alarm(run_time);

gettimeofday(&start_time, &tz);

while (!done) {

if (scnt >= 1 || (peer2peer && !servername) ||

(!peer2peer && servername)) {

int count = tx_depth;

/* Wait for recv completions */

while (!done && count--) {

do {

ne = ibv_poll_cq(ctx->rcq, 1, &wc); //comment16 “iwarp verbs poll completion queue”

if (!poll && ne == 0) {

if (ibv_get_cq_event(ctx->ch, &ev_cq, &ev_ctx)) {

fprintf(stderr, "Failed to get cq event!\n");

return 1;

}

if (ev_cq != ctx->rcq) {

fprintf(stderr, "Unkown CQ!\n");

return 1;

}

ibv_ack_cq_events(ctx->rcq, 1);

ibv_req_notify_cq(ctx->rcq, 0);

}

if (done) break;

} while (ne == 0);

if (ne < 0) {

fprintf(stderr, "poll CQ failed %d\n", ne);

break;

}

if (wc.status != IBV_WC_SUCCESS) {

fprintf(stderr, "Completion wth error at %s:\n",

servername ? "client" : "server");

fprintf(stderr, "Failed status %d: wr_id %d\n",

wc.status, (int) wc.wr_id);

fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",

scnt, rcnt, ccnt);

break;

}

if (done) break;

}

count = tx_depth;

while (!done && count--) {

if (ibv_post_send(qp, wr, &bad_wr)) { //comment17 “iwarp verbs post send”

fprintf(stderr, "Couldn't post send: scnt=%d\n",

scnt);

break;

}

scnt++;

pp_post_recv(ctx, size, 1); //comment18 “iwarp verbs post receive”

++rcnt;

}

while (!done && ccnt < scnt) {

do {

ne = ibv_poll_cq(ctx->scq, 1, &wc); //comment19 “iwarp verbs poll completion queue”

if (ne < 0) {

fprintf(stderr, "poll CQ failed %d\n", ne);

break;

}

} while (ne == 0);

if (ne == 1) {

if (wc.status != IBV_WC_SUCCESS) {

fprintf(stderr, "Completion wth error at %s:\n",

servername ? "client" : "server");

fprintf(stderr, "Failed status %d: wr_id %d\n",

wc.status, (int) wc.wr_id);

fprintf(stderr, "scnt=%d, rcnt=%d, ccnt=%d\n",

scnt, rcnt, ccnt);

break;

}

++ccnt;

}

gettimeofday(&stop_time, &tz);

//comment20 “finish test client”

if (servername) {

if (verbose)

printf("scnt %u ccnt %u rcnt %u\n", scnt, ccnt, rcnt);

print_report(size, ccnt, &start_time, &stop_time);

if (myserver) {

char *buf;

size_t buflen;

while (getline(&buf, &buflen, stdin) != -1)

printf("server: %s", buf);

}

return 0;

}

Low Latency Technology 2012 가을 행사 자료(2)

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