text: /*
   * Copyright (c) 2005 Ammasso, Inc. All rights reserved.
   * Copyright (c) 2006 Open Grid Computing, Inc. All rights reserved.
   *
   * 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.
   */
  
  #include <getopt.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdio.h>
  #include <errno.h>
  #include <sys/types.h>
  #include <netinet/in.h>
  #include <sys/socket.h>
  #include <netdb.h>
  #include <semaphore.h>
  #include <arpa/inet.h>
  #include <pthread.h>
  #include <inttypes.h>
  
  #include <rdma/rdma_cma.h>
  #include <infiniband/arch.h>
  
  static int debug = 0;
  #define DEBUG_LOG if (debug) printf
  
  /*
   * rping "ping/pong" loop:
   * 	client sends source rkey/addr/len
   *	server receives source rkey/add/len
   *	server rdma reads "ping" data from source
   * 	server sends "go ahead" on rdma read completion
   *	client sends sink rkey/addr/len
   * 	server receives sink rkey/addr/len
   * 	server rdma writes "pong" data to sink
   * 	server sends "go ahead" on rdma write completion
   * 	<repeat loop>
   */
  
  /*
   * These states are used to signal events between the completion handler
   * and the main client or server thread.
   *
   * Once CONNECTED, they cycle through RDMA_READ_ADV, RDMA_WRITE_ADV, 
   * and RDMA_WRITE_COMPLETE for each ping.
   */
  enum test_state {
  	IDLE = 1,
  	CONNECT_REQUEST,
  	ADDR_RESOLVED,
  	ROUTE_RESOLVED,
  	CONNECTED,
  	RDMA_READ_ADV,
  	RDMA_READ_COMPLETE,
  	RDMA_WRITE_ADV,
  	RDMA_WRITE_COMPLETE,
  	ERROR
  };
  
  struct rping_rdma_info {
  	uint64_t buf;
  	uint32_t rkey;
  	uint32_t size;
  };
  
  /*
   * Default max buffer size for IO...
   */
  #define RPING_BUFSIZE 64*1024
  #define RPING_SQ_DEPTH 16
  
  /* Default string for print data and
   * minimum buffer size
   */
  #define _stringify( _x ) # _x
  #define stringify( _x ) _stringify( _x )
  
  #define RPING_MSG_FMT           "rdma-ping-%d: "
  #define RPING_MIN_BUFSIZE       sizeof(stringify(INT_MAX)) + sizeof(RPING_MSG_FMT)
  
  /*
   * Control block struct.
   */
  struct rping_cb {
  	int server;			/* 0 iff client */
  	pthread_t cqthread;
  	pthread_t persistent_server_thread;
  	struct ibv_comp_channel *channel;
  	struct ibv_cq *cq;
  	struct ibv_pd *pd;
  	struct ibv_qp *qp;
  
  	struct ibv_recv_wr rq_wr;	/* recv work request record */
  	struct ibv_sge recv_sgl;	/* recv single SGE */
  	struct rping_rdma_info recv_buf;/* malloc'd buffer */
  	struct ibv_mr *recv_mr;		/* MR associated with this buffer */
  
  	struct ibv_send_wr sq_wr;	/* send work request record */
  	struct ibv_sge send_sgl;
  	struct rping_rdma_info send_buf;/* single send buf */
  	struct ibv_mr *send_mr;
  
  	struct ibv_send_wr rdma_sq_wr;	/* rdma work request record */
  	struct ibv_sge rdma_sgl;	/* rdma single SGE */
  	char *rdma_buf;			/* used as rdma sink */
  	struct ibv_mr *rdma_mr;
  
  	uint32_t remote_rkey;		/* remote guys RKEY */
  	uint64_t remote_addr;		/* remote guys TO */
  	uint32_t remote_len;		/* remote guys LEN */
  
  	char *start_buf;		/* rdma read src */
  	struct ibv_mr *start_mr;
  
  	enum test_state state;		/* used for cond/signalling */
  	sem_t sem;
  
  	struct sockaddr_storage sin;
  	uint16_t port;			/* dst port in NBO */
  	int verbose;			/* verbose logging */
  	int count;			/* ping count */
  	int size;			/* ping data size */
  	int validate;			/* validate ping data */
  
  	/* CM stuff */
  	pthread_t cmthread;
  	struct rdma_event_channel *cm_channel;
  	struct rdma_cm_id *cm_id;	/* connection on client side,*/
  					/* listener on service side. */
  	struct rdma_cm_id *child_cm_id;	/* connection on server side */
  };
  
  static int rping_cma_event_handler(struct rdma_cm_id *cma_id,
  				    struct rdma_cm_event *event)
  {
  	int ret = 0;
  	struct rping_cb *cb = cma_id->context;
  
  	DEBUG_LOG("cma_event type %s cma_id %p (%s)\n",
  		  rdma_event_str(event->event), cma_id,
  		  (cma_id == cb->cm_id) ? "parent" : "child");
  
  	switch (event->event) {
  	case RDMA_CM_EVENT_ADDR_RESOLVED:
  		cb->state = ADDR_RESOLVED;
  		ret = rdma_resolve_route(cma_id, 2000);
  		if (ret) {
  			cb->state = ERROR;
  			perror("rdma_resolve_route");
  			sem_post(&cb->sem);
  		}
  		break;
  
  	case RDMA_CM_EVENT_ROUTE_RESOLVED:
  		cb->state = ROUTE_RESOLVED;
  		sem_post(&cb->sem);
  		break;
  
  	case RDMA_CM_EVENT_CONNECT_REQUEST:
  		cb->state = CONNECT_REQUEST;
  		cb->child_cm_id = cma_id;
  		DEBUG_LOG("child cma %p\n", cb->child_cm_id);
  		sem_post(&cb->sem);
  		break;
  
  	case RDMA_CM_EVENT_ESTABLISHED:
  		DEBUG_LOG("ESTABLISHED\n");
  
  		/*
  		 * Server will wake up when first RECV completes.
  		 */
  		if (!cb->server) {
  			cb->state = CONNECTED;
  		}
  		sem_post(&cb->sem);
  		break;
  
  	case RDMA_CM_EVENT_ADDR_ERROR:
  	case RDMA_CM_EVENT_ROUTE_ERROR:
  	case RDMA_CM_EVENT_CONNECT_ERROR:
  	case RDMA_CM_EVENT_UNREACHABLE:
  	case RDMA_CM_EVENT_REJECTED:
  		fprintf(stderr, "cma event %s, error %d\n",
  			rdma_event_str(event->event), event->status);
  		sem_post(&cb->sem);
  		ret = -1;
  		break;
  
  	case RDMA_CM_EVENT_DISCONNECTED:
  		fprintf(stderr, "%s DISCONNECT EVENT...\n",
  			cb->server ? "server" : "client");
  		sem_post(&cb->sem);
  		break;
  
  	case RDMA_CM_EVENT_DEVICE_REMOVAL:
  		fprintf(stderr, "cma detected device removal!!!!\n");
  		ret = -1;
  		break;
  
  	default:
  		fprintf(stderr, "unhandled event: %s, ignoring\n",
  			rdma_event_str(event->event));
  		break;
  	}
  
  	return ret;
  }
  
  static int server_recv(struct rping_cb *cb, struct ibv_wc *wc)
  {
  	if (wc->byte_len != sizeof(cb->recv_buf)) {
  		fprintf(stderr, "Received bogus data, size %d\n", wc->byte_len);
  		return -1;
  	}
  
  	cb->remote_rkey = ntohl(cb->recv_buf.rkey);
  	cb->remote_addr = ntohll(cb->recv_buf.buf);
  	cb->remote_len  = ntohl(cb->recv_buf.size);
  	DEBUG_LOG("Received rkey %x addr %" PRIx64 " len %d from peer\n",
  		  cb->remote_rkey, cb->remote_addr, cb->remote_len);
  
  	if (cb->state <= CONNECTED || cb->state == RDMA_WRITE_COMPLETE)
  		cb->state = RDMA_READ_ADV;
  	else
  		cb->state = RDMA_WRITE_ADV;
  
  	return 0;
  }
  
  static int client_recv(struct rping_cb *cb, struct ibv_wc *wc)
  {
  	if (wc->byte_len != sizeof(cb->recv_buf)) {
  		fprintf(stderr, "Received bogus data, size %d\n", wc->byte_len);
  		return -1;
  	}
  
  	if (cb->state == RDMA_READ_ADV)
  		cb->state = RDMA_WRITE_ADV;
  	else
  		cb->state = RDMA_WRITE_COMPLETE;
  
  	return 0;
  }
  
  static int rping_cq_event_handler(struct rping_cb *cb)
  {
  	struct ibv_wc wc;
  	struct ibv_recv_wr *bad_wr;
  	int ret;
  
  	while ((ret = ibv_poll_cq(cb->cq, 1, &wc)) == 1) {
  		ret = 0;
  
  		if (wc.status) {
  			if (wc.status != IBV_WC_WR_FLUSH_ERR)
  				fprintf(stderr, "cq completion failed status %d\n",
  					wc.status);
  			ret = -1;
  			goto error;
  		}
  
  		switch (wc.opcode) {
  		case IBV_WC_SEND:
  			DEBUG_LOG("send completion\n");
  			break;
  
  		case IBV_WC_RDMA_WRITE:
  			DEBUG_LOG("rdma write completion\n");
  			cb->state = RDMA_WRITE_COMPLETE;
  			sem_post(&cb->sem);
  			break;
  
  		case IBV_WC_RDMA_READ:
  			DEBUG_LOG("rdma read completion\n");
  			cb->state = RDMA_READ_COMPLETE;
  			sem_post(&cb->sem);
  			break;
  
  		case IBV_WC_RECV:
  			DEBUG_LOG("recv completion\n");
  			ret = cb->server ? server_recv(cb, &wc) :
  					   client_recv(cb, &wc);
  			if (ret) {
  				fprintf(stderr, "recv wc error: %d\n", ret);
  				goto error;
  			}
  
  			ret = ibv_post_recv(cb->qp, &cb->rq_wr, &bad_wr);
  			if (ret) {
  				fprintf(stderr, "post recv error: %d\n", ret);
  				goto error;
  			}
  			sem_post(&cb->sem);
  			break;
  
  		default:
  			DEBUG_LOG("unknown!!!!! completion\n");
  			ret = -1;
  			goto error;
  		}
  	}
  	if (ret) {
  		fprintf(stderr, "poll error %d\n", ret);
  		goto error;
  	}
  	return 0;
  
  error:
  	cb->state = ERROR;
  	sem_post(&cb->sem);
  	return ret;
  }
  
  static int rping_accept(struct rping_cb *cb)
  {
  	struct rdma_conn_param conn_param;
  	int ret;
  
  	DEBUG_LOG("accepting client connection request\n");
  
  	memset(&conn_param, 0, sizeof conn_param);
  	conn_param.responder_resources = 1;
  	conn_param.initiator_depth = 1;
  
  	ret = rdma_accept(cb->child_cm_id, &conn_param);
  	if (ret) {
  		perror("rdma_accept");
  		return ret;
  	}
  
  	sem_wait(&cb->sem);
  	if (cb->state == ERROR) {
  		fprintf(stderr, "wait for CONNECTED state %d\n", cb->state);
  		return -1;
  	}
  	return 0;
  }
  
  static void rping_setup_wr(struct rping_cb *cb)
  {
  	cb->recv_sgl.addr = (uint64_t) (unsigned long) &cb->recv_buf;
  	cb->recv_sgl.length = sizeof cb->recv_buf;
  	cb->recv_sgl.lkey = cb->recv_mr->lkey;
  	cb->rq_wr.sg_list = &cb->recv_sgl;
  	cb->rq_wr.num_sge = 1;
  
  	cb->send_sgl.addr = (uint64_t) (unsigned long) &cb->send_buf;
  	cb->send_sgl.length = sizeof cb->send_buf;
  	cb->send_sgl.lkey = cb->send_mr->lkey;
  
  	cb->sq_wr.opcode = IBV_WR_SEND;
  	cb->sq_wr.send_flags = IBV_SEND_SIGNALED;
  	cb->sq_wr.sg_list = &cb->send_sgl;
  	cb->sq_wr.num_sge = 1;
  
  	cb->rdma_sgl.addr = (uint64_t) (unsigned long) cb->rdma_buf;
  	cb->rdma_sgl.lkey = cb->rdma_mr->lkey;
  	cb->rdma_sq_wr.send_flags = IBV_SEND_SIGNALED;
  	cb->rdma_sq_wr.sg_list = &cb->rdma_sgl;
  	cb->rdma_sq_wr.num_sge = 1;
  }
  
  static int rping_setup_buffers(struct rping_cb *cb)
  {
  	int ret;
  
  	DEBUG_LOG("rping_setup_buffers called on cb %p\n", cb);
  
  	cb->recv_mr = ibv_reg_mr(cb->pd, &cb->recv_buf, sizeof cb->recv_buf,
  				 IBV_ACCESS_LOCAL_WRITE);
  	if (!cb->recv_mr) {
  		fprintf(stderr, "recv_buf reg_mr failed\n");
  		return errno;
  	}
  
  	cb->send_mr = ibv_reg_mr(cb->pd, &cb->send_buf, sizeof cb->send_buf, 0);
  	if (!cb->send_mr) {
  		fprintf(stderr, "send_buf reg_mr failed\n");
  		ret = errno;
  		goto err1;
  	}
  
  	cb->rdma_buf = malloc(cb->size);
  	if (!cb->rdma_buf) {
  		fprintf(stderr, "rdma_buf malloc failed\n");
  		ret = -ENOMEM;
  		goto err2;
  	}
  
  	cb->rdma_mr = ibv_reg_mr(cb->pd, cb->rdma_buf, cb->size,
  				 IBV_ACCESS_LOCAL_WRITE |
  				 IBV_ACCESS_REMOTE_READ |
  				 IBV_ACCESS_REMOTE_WRITE);
  	if (!cb->rdma_mr) {
  		fprintf(stderr, "rdma_buf reg_mr failed\n");
  		ret = errno;
  		goto err3;
  	}
  
  	if (!cb->server) {
  		cb->start_buf = malloc(cb->size);
  		if (!cb->start_buf) {
  			fprintf(stderr, "start_buf malloc failed\n");
  			ret = -ENOMEM;
  			goto err4;
  		}
  
  		cb->start_mr = ibv_reg_mr(cb->pd, cb->start_buf, cb->size,
  					  IBV_ACCESS_LOCAL_WRITE | 
  					  IBV_ACCESS_REMOTE_READ |
  					  IBV_ACCESS_REMOTE_WRITE);
  		if (!cb->start_mr) {
  			fprintf(stderr, "start_buf reg_mr failed\n");
  			ret = errno;
  			goto err5;
  		}
  	}
  
  	rping_setup_wr(cb);
  	DEBUG_LOG("allocated & registered buffers...\n");
  	return 0;
  
  err5:
  	free(cb->start_buf);
  err4:
  	ibv_dereg_mr(cb->rdma_mr);
  err3:
  	free(cb->rdma_buf);
  err2:
  	ibv_dereg_mr(cb->send_mr);
  err1:
  	ibv_dereg_mr(cb->recv_mr);
  	return ret;
  }
  
  static void rping_free_buffers(struct rping_cb *cb)
  {
  	DEBUG_LOG("rping_free_buffers called on cb %p\n", cb);
  	ibv_dereg_mr(cb->recv_mr);
  	ibv_dereg_mr(cb->send_mr);
  	ibv_dereg_mr(cb->rdma_mr);
  	free(cb->rdma_buf);
  	if (!cb->server) {
  		ibv_dereg_mr(cb->start_mr);
  		free(cb->start_buf);
  	}
  }
  
  static int rping_create_qp(struct rping_cb *cb)
  {
  	struct ibv_qp_init_attr init_attr;
  	int ret;
  
  	memset(&init_attr, 0, sizeof(init_attr));
  	init_attr.cap.max_send_wr = RPING_SQ_DEPTH;
  	init_attr.cap.max_recv_wr = 2;
  	init_attr.cap.max_recv_sge = 1;
  	init_attr.cap.max_send_sge = 1;
  	init_attr.qp_type = IBV_QPT_RC;
  	init_attr.send_cq = cb->cq;
  	init_attr.recv_cq = cb->cq;
  
  	if (cb->server) {
  		ret = rdma_create_qp(cb->child_cm_id, cb->pd, &init_attr);
  		if (!ret)
  			cb->qp = cb->child_cm_id->qp;
  	} else {
  		ret = rdma_create_qp(cb->cm_id, cb->pd, &init_attr);
  		if (!ret)
  			cb->qp = cb->cm_id->qp;
  	}
  
  	return ret;
  }
  
  static void rping_free_qp(struct rping_cb *cb)
  {
  	ibv_destroy_qp(cb->qp);
  	ibv_destroy_cq(cb->cq);
  	ibv_destroy_comp_channel(cb->channel);
  	ibv_dealloc_pd(cb->pd);
  }
  
  static int rping_setup_qp(struct rping_cb *cb, struct rdma_cm_id *cm_id)
  {
  	int ret;
  
  	cb->pd = ibv_alloc_pd(cm_id->verbs);
  	if (!cb->pd) {
  		fprintf(stderr, "ibv_alloc_pd failed\n");
  		return errno;
  	}
  	DEBUG_LOG("created pd %p\n", cb->pd);
  
  	cb->channel = ibv_create_comp_channel(cm_id->verbs);
  	if (!cb->channel) {
  		fprintf(stderr, "ibv_create_comp_channel failed\n");
  		ret = errno;
  		goto err1;
  	}
  	DEBUG_LOG("created channel %p\n", cb->channel);
  
  	cb->cq = ibv_create_cq(cm_id->verbs, RPING_SQ_DEPTH * 2, cb,
  				cb->channel, 0);
  	if (!cb->cq) {
  		fprintf(stderr, "ibv_create_cq failed\n");
  		ret = errno;
  		goto err2;
  	}
  	DEBUG_LOG("created cq %p\n", cb->cq);
  
  	ret = ibv_req_notify_cq(cb->cq, 0);
  	if (ret) {
  		fprintf(stderr, "ibv_create_cq failed\n");
  		ret = errno;
  		goto err3;
  	}
  
  	ret = rping_create_qp(cb);
  	if (ret) {
  		perror("rdma_create_qp");
  		goto err3;
  	}
  	DEBUG_LOG("created qp %p\n", cb->qp);
  	return 0;
  
  err3:
  	ibv_destroy_cq(cb->cq);
  err2:
  	ibv_destroy_comp_channel(cb->channel);
  err1:
  	ibv_dealloc_pd(cb->pd);
  	return ret;
  }
  
  static void *cm_thread(void *arg)
  {
  	struct rping_cb *cb = arg;
  	struct rdma_cm_event *event;
  	int ret;
  
  	while (1) {
  		ret = rdma_get_cm_event(cb->cm_channel, &event);
  		if (ret) {
  			perror("rdma_get_cm_event");
  			exit(ret);
  		}
  		ret = rping_cma_event_handler(event->id, event);
  		rdma_ack_cm_event(event);
  		if (ret)
  			exit(ret);
  	}
  }
  
  static void *cq_thread(void *arg)
  {
  	struct rping_cb *cb = arg;
  	struct ibv_cq *ev_cq;
  	void *ev_ctx;
  	int ret;
  	
  	DEBUG_LOG("cq_thread started.\n");
  
  	while (1) {	
  		pthread_testcancel();
  
  		ret = ibv_get_cq_event(cb->channel, &ev_cq, &ev_ctx);
  		if (ret) {
  			fprintf(stderr, "Failed to get cq event!\n");
  			pthread_exit(NULL);
  		}
  		if (ev_cq != cb->cq) {
  			fprintf(stderr, "Unknown CQ!\n");
  			pthread_exit(NULL);
  		}
  		ret = ibv_req_notify_cq(cb->cq, 0);
  		if (ret) {
  			fprintf(stderr, "Failed to set notify!\n");
  			pthread_exit(NULL);
  		}
  		ret = rping_cq_event_handler(cb);
  		ibv_ack_cq_events(cb->cq, 1);
  		if (ret)
  			pthread_exit(NULL);
  	}
  }
  
  static void rping_format_send(struct rping_cb *cb, char *buf, struct ibv_mr *mr)
  {
  	struct rping_rdma_info *info = &cb->send_buf;
  
  	info->buf = htonll((uint64_t) (unsigned long) buf);
  	info->rkey = htonl(mr->rkey);
  	info->size = htonl(cb->size);
  
  	DEBUG_LOG("RDMA addr %" PRIx64" rkey %x len %d\n",
  		  ntohll(info->buf), ntohl(info->rkey), ntohl(info->size));
  }
  
  static int rping_test_server(struct rping_cb *cb)
  {
  	struct ibv_send_wr *bad_wr;
  	int ret;
  
  	while (1) {
  		/* Wait for client's Start STAG/TO/Len */
  		sem_wait(&cb->sem);
  		if (cb->state != RDMA_READ_ADV) {
  			fprintf(stderr, "wait for RDMA_READ_ADV state %d\n",
  				cb->state);
  			ret = -1;
  			break;
  		}
  
  		DEBUG_LOG("server received sink adv\n");
  
  		/* Issue RDMA Read. */
  		cb->rdma_sq_wr.opcode = IBV_WR_RDMA_READ;
  		cb->rdma_sq_wr.wr.rdma.rkey = cb->remote_rkey;
  		cb->rdma_sq_wr.wr.rdma.remote_addr = cb->remote_addr;
  		cb->rdma_sq_wr.sg_list->length = cb->remote_len;
  
  		ret = ibv_post_send(cb->qp, &cb->rdma_sq_wr, &bad_wr);
  		if (ret) {
  			fprintf(stderr, "post send error %d\n", ret);
  			break;
  		}
  		DEBUG_LOG("server posted rdma read req \n");
  
  		/* Wait for read completion */
  		sem_wait(&cb->sem);
  		if (cb->state != RDMA_READ_COMPLETE) {
  			fprintf(stderr, "wait for RDMA_READ_COMPLETE state %d\n",
  				cb->state);
  			ret = -1;
  			break;
  		}
  		DEBUG_LOG("server received read complete\n");
  
  		/* Display data in recv buf */
  		if (cb->verbose)
  			printf("server ping data: %s\n", cb->rdma_buf);
  
  		/* Tell client to continue */
  		ret = ibv_post_send(cb->qp, &cb->sq_wr, &bad_wr);
  		if (ret) {
  			fprintf(stderr, "post send error %d\n", ret);
  			break;
  		}
  		DEBUG_LOG("server posted go ahead\n");
  
  		/* Wait for client's RDMA STAG/TO/Len */
  		sem_wait(&cb->sem);
  		if (cb->state != RDMA_WRITE_ADV) {
  			fprintf(stderr, "wait for RDMA_WRITE_ADV state %d\n",
  				cb->state);
  			ret = -1;
  			break;
  		}
  		DEBUG_LOG("server received sink adv\n");
  
  		/* RDMA Write echo data */
  		cb->rdma_sq_wr.opcode = IBV_WR_RDMA_WRITE;
  		cb->rdma_sq_wr.wr.rdma.rkey = cb->remote_rkey;
  		cb->rdma_sq_wr.wr.rdma.remote_addr = cb->remote_addr;
  		cb->rdma_sq_wr.sg_list->length = strlen(cb->rdma_buf) + 1;
  		DEBUG_LOG("rdma write from lkey %x laddr %" PRIx64 " len %d\n",
  			  cb->rdma_sq_wr.sg_list->lkey,
  			  cb->rdma_sq_wr.sg_list->addr,
  			  cb->rdma_sq_wr.sg_list->length);
  
  		ret = ibv_post_send(cb->qp, &cb->rdma_sq_wr, &bad_wr);
  		if (ret) {
  			fprintf(stderr, "post send error %d\n", ret);
  			break;
  		}
  
  		/* Wait for completion */
  		ret = sem_wait(&cb->sem);
  		if (cb->state != RDMA_WRITE_COMPLETE) {
  			fprintf(stderr, "wait for RDMA_WRITE_COMPLETE state %d\n",
  				cb->state);
  			ret = -1;
  			break;
  		}
  		DEBUG_LOG("server rdma write complete \n");
  
  		/* Tell client to begin again */
  		ret = ibv_post_send(cb->qp, &cb->sq_wr, &bad_wr);
  		if (ret) {
  			fprintf(stderr, "post send error %d\n", ret);
  			break;
  		}
  		DEBUG_LOG("server posted go ahead\n");
  	}
  
  	return ret;
  }
  
  static int rping_bind_server(struct rping_cb *cb)
  {
  	int ret;
  
  	if (cb->sin.ss_family == AF_INET)
  		((struct sockaddr_in *) &cb->sin)->sin_port = cb->port;
  	else
  		((struct sockaddr_in6 *) &cb->sin)->sin6_port = cb->port;
  
  	ret = rdma_bind_addr(cb->cm_id, (struct sockaddr *) &cb->sin);
  	if (ret) {
  		perror("rdma_bind_addr");
  		return ret;
  	}
  	DEBUG_LOG("rdma_bind_addr successful\n");
  
  	DEBUG_LOG("rdma_listen\n");
  	ret = rdma_listen(cb->cm_id, 3);
  	if (ret) {
  		perror("rdma_listen");
  		return ret;
  	}
  
  	return 0;
  }
  
  static struct rping_cb *clone_cb(struct rping_cb *listening_cb)
  {
  	struct rping_cb *cb = malloc(sizeof *cb);
  	if (!cb)
  		return NULL;
  	*cb = *listening_cb;
  	cb->child_cm_id->context = cb;
  	return cb;
  }
  
  static void free_cb(struct rping_cb *cb)
  {
  	free(cb);
  }
  
  static void *rping_persistent_server_thread(void *arg)
  {
  	struct rping_cb *cb = arg;
  	struct ibv_recv_wr *bad_wr;
  	int ret;
  
  	ret = rping_setup_qp(cb, cb->child_cm_id);
  	if (ret) {
  		fprintf(stderr, "setup_qp failed: %d\n", ret);
  		goto err0;
  	}
  
  	ret = rping_setup_buffers(cb);
  	if (ret) {
  		fprintf(stderr, "rping_setup_buffers failed: %d\n", ret);
  		goto err1;
  	}
  
  	ret = ibv_post_recv(cb->qp, &cb->rq_wr, &bad_wr);
  	if (ret) {
  		fprintf(stderr, "ibv_post_recv failed: %d\n", ret);
  		goto err2;
  	}
  
  	pthread_create(&cb->cqthread, NULL, cq_thread, cb);
  
  	ret = rping_accept(cb);
  	if (ret) {
  		fprintf(stderr, "connect error %d\n", ret);
  		goto err3;
  	}
  
  	rping_test_server(cb);
  	rdma_disconnect(cb->child_cm_id);
  	pthread_join(cb->cqthread, NULL);
  	rping_free_buffers(cb);
  	rping_free_qp(cb);
  	rdma_destroy_id(cb->child_cm_id);
  	free_cb(cb);
  	return NULL;
  err3:
  	pthread_cancel(cb->cqthread);
  	pthread_join(cb->cqthread, NULL);
  err2:
  	rping_free_buffers(cb);
  err1:
  	rping_free_qp(cb);
  err0:
  	free_cb(cb);
  	return NULL;
  }
  
  static int rping_run_persistent_server(struct rping_cb *listening_cb)
  {
  	int ret;
  	struct rping_cb *cb;
  
  	ret = rping_bind_server(listening_cb);
  	if (ret)
  		return ret;
  
  	while (1) {
  		sem_wait(&listening_cb->sem);
  		if (listening_cb->state != CONNECT_REQUEST) {
  			fprintf(stderr, "wait for CONNECT_REQUEST state %d\n",
  				listening_cb->state);
  			return -1;
  		}
  
  		cb = clone_cb(listening_cb);
  		if (!cb)
  			return -1;
  		pthread_create(&cb->persistent_server_thread, NULL, rping_persistent_server_thread, cb);
  	}
  	return 0;
  }
  
  static int rping_run_server(struct rping_cb *cb)
  {
  	struct ibv_recv_wr *bad_wr;
  	int ret;
  
  	ret = rping_bind_server(cb);
  	if (ret)
  		return ret;
  
  	sem_wait(&cb->sem);
  	if (cb->state != CONNECT_REQUEST) {
  		fprintf(stderr, "wait for CONNECT_REQUEST state %d\n",
  			cb->state);
  		return -1;
  	}
  
  	ret = rping_setup_qp(cb, cb->child_cm_id);
  	if (ret) {
  		fprintf(stderr, "setup_qp failed: %d\n", ret);
  		return ret;
  	}
  
  	ret = rping_setup_buffers(cb);
  	if (ret) {
  		fprintf(stderr, "rping_setup_buffers failed: %d\n", ret);
  		goto err1;
  	}
  
  	ret = ibv_post_recv(cb->qp, &cb->rq_wr, &bad_wr);
  	if (ret) {
  		fprintf(stderr, "ibv_post_recv failed: %d\n", ret);
  		goto err2;
  	}
  
  	pthread_create(&cb->cqthread, NULL, cq_thread, cb);
  
  	ret = rping_accept(cb);
  	if (ret) {
  		fprintf(stderr, "connect error %d\n", ret);
  		goto err2;
  	}
  
  	rping_test_server(cb);
  	rdma_disconnect(cb->child_cm_id);
  	pthread_join(cb->cqthread, NULL);
  	rdma_destroy_id(cb->child_cm_id);
  err2:
  	rping_free_buffers(cb);
  err1:
  	rping_free_qp(cb);
  
  	return ret;
  }
  
  static int rping_test_client(struct rping_cb *cb)
  {
  	int ping, start, cc, i, ret = 0;
  	struct ibv_send_wr *bad_wr;
  	unsigned char c;
  
  	start = 65;
  	for (ping = 0; !cb->count || ping < cb->count; ping++) {
  		cb->state = RDMA_READ_ADV;
  
  		/* Put some ascii text in the buffer. */
  		cc = sprintf(cb->start_buf, RPING_MSG_FMT, ping);
  		for (i = cc, c = start; i < cb->size; i++) {
  			cb->start_buf[i] = c;
  			c++;
  			if (c > 122)
  				c = 65;
  		}
  		start++;
  		if (start > 122)
  			start = 65;
  		cb->start_buf[cb->size - 1] = 0;
  
  		rping_format_send(cb, cb->start_buf, cb->start_mr);
  		ret = ibv_post_send(cb->qp, &cb->sq_wr, &bad_wr);
  		if (ret) {
  			fprintf(stderr, "post send error %d\n", ret);
  			break;
  		}
  
  		/* Wait for server to ACK */
  		sem_wait(&cb->sem);
  		if (cb->state != RDMA_WRITE_ADV) {
  			fprintf(stderr, "wait for RDMA_WRITE_ADV state %d\n",
  				cb->state);
  			ret = -1;
  			break;
  		}
  
  		rping_format_send(cb, cb->rdma_buf, cb->rdma_mr);
  		ret = ibv_post_send(cb->qp, &cb->sq_wr, &bad_wr);
  		if (ret) {
  			fprintf(stderr, "post send error %d\n", ret);
  			break;
  		}
  
  		/* Wait for the server to say the RDMA Write is complete. */
  		sem_wait(&cb->sem);
  		if (cb->state != RDMA_WRITE_COMPLETE) {
  			fprintf(stderr, "wait for RDMA_WRITE_COMPLETE state %d\n",
  				cb->state);
  			ret = -1;
  			break;
  		}
  
  		if (cb->validate)
  			if (memcmp(cb->start_buf, cb->rdma_buf, cb->size)) {
  				fprintf(stderr, "data mismatch!\n");
  				ret = -1;
  				break;
  			}
  
  		if (cb->verbose)
  			printf("ping data: %s\n", cb->rdma_buf);
  	}
  
  	return ret;
  }
  
  static int rping_connect_client(struct rping_cb *cb)
  {
  	struct rdma_conn_param conn_param;
  	int ret;
  
  	memset(&conn_param, 0, sizeof conn_param);
  	conn_param.responder_resources = 1;
  	conn_param.initiator_depth = 1;
  	conn_param.retry_count = 10;
  
  	ret = rdma_connect(cb->cm_id, &conn_param);
  	if (ret) {
  		perror("rdma_connect");
  		return ret;
  	}
  
  	sem_wait(&cb->sem);
  	if (cb->state != CONNECTED) {
  		fprintf(stderr, "wait for CONNECTED state %d\n", cb->state);
  		return -1;
  	}
  
  	DEBUG_LOG("rmda_connect successful\n");
  	return 0;
  }
  
  static int rping_bind_client(struct rping_cb *cb)
  {
  	int ret;
  
  	if (cb->sin.ss_family == AF_INET)
  		((struct sockaddr_in *) &cb->sin)->sin_port = cb->port;
  	else
  		((struct sockaddr_in6 *) &cb->sin)->sin6_port = cb->port;
  
  	ret = rdma_resolve_addr(cb->cm_id, NULL, (struct sockaddr *) &cb->sin, 2000);
  	if (ret) {
  		perror("rdma_resolve_addr");
  		return ret;
  	}
  
  	sem_wait(&cb->sem);
  	if (cb->state != ROUTE_RESOLVED) {
  		fprintf(stderr, "waiting for addr/route resolution state %d\n",
  			cb->state);
  		return -1;
  	}
  
  	DEBUG_LOG("rdma_resolve_addr - rdma_resolve_route successful\n");
  	return 0;
  }
  
  static int rping_run_client(struct rping_cb *cb)
  {
  	struct ibv_recv_wr *bad_wr;
  	int ret;
  
  	ret = rping_bind_client(cb);
  	if (ret)
  		return ret;
  
  	ret = rping_setup_qp(cb, cb->cm_id);
  	if (ret) {
  		fprintf(stderr, "setup_qp failed: %d\n", ret);
  		return ret;
  	}
  
  	ret = rping_setup_buffers(cb);
  	if (ret) {
  		fprintf(stderr, "rping_setup_buffers failed: %d\n", ret);
  		goto err1;
  	}
  
  	ret = ibv_post_recv(cb->qp, &cb->rq_wr, &bad_wr);
  	if (ret) {
  		fprintf(stderr, "ibv_post_recv failed: %d\n", ret);
  		goto err2;
  	}
  
  	pthread_create(&cb->cqthread, NULL, cq_thread, cb);
  
  	ret = rping_connect_client(cb);
  	if (ret) {
  		fprintf(stderr, "connect error %d\n", ret);
  		goto err3;
  	}
  
  	ret = rping_test_client(cb);
  	if (ret) {
  		fprintf(stderr, "rping client failed: %d\n", ret);
  		goto err4;
  	}
  	ret = 0;
  err4:
  	rdma_disconnect(cb->cm_id);
  err3:
  	pthread_join(cb->cqthread, NULL);
  err2:
  	rping_free_buffers(cb);
  err1:
  	rping_free_qp(cb);
  
  	return ret;
  }
  
  static int get_addr(char *dst, struct sockaddr *addr)
  {
  	struct addrinfo *res;
  	int ret;
  
  	ret = getaddrinfo(dst, NULL, NULL, &res);
  	if (ret) {
  		printf("getaddrinfo failed - invalid hostname or IP address\n");
  		return ret;
  	}
  
  	if (res->ai_family == PF_INET)
  		memcpy(addr, res->ai_addr, sizeof(struct sockaddr_in));
  	else if (res->ai_family == PF_INET6)
  		memcpy(addr, res->ai_addr, sizeof(struct sockaddr_in6));
  	else
  		ret = -1;
  	
  	freeaddrinfo(res);
  	return ret;
  }
  
  static void usage(char *name)
  {
  	printf("%s -s [-vVd] [-S size] [-C count] [-a addr] [-p port]\n", 
  	       name);
  	printf("%s -c [-vVd] [-S size] [-C count] -a addr [-p port]\n", 
  	       name);
  	printf("\t-c\t\tclient side\n");
  	printf("\t-s\t\tserver side.  To bind to any address with IPv6 use -a ::0\n");
  	printf("\t-v\t\tdisplay ping data to stdout\n");
  	printf("\t-V\t\tvalidate ping data\n");
  	printf("\t-d\t\tdebug printfs\n");
  	printf("\t-S size \tping data size\n");
  	printf("\t-C count\tping count times\n");
  	printf("\t-a addr\t\taddress\n");
  	printf("\t-p port\t\tport\n");
  	printf("\t-P\t\tpersistent server mode allowing multiple connections\n");
  }
  
  int main(int argc, char *argv[])
  {
  	struct rping_cb *cb;
  	int op;
  	int ret = 0;
  	int persistent_server = 0;
  
  	cb = malloc(sizeof(*cb));
  	if (!cb)
  		return -ENOMEM;
  
  	memset(cb, 0, sizeof(*cb));
  	cb->server = -1;
  	cb->state = IDLE;
  	cb->size = 64;
  	cb->sin.ss_family = PF_INET;
  	cb->port = htons(7174);
  	sem_init(&cb->sem, 0, 0);
  
  	opterr = 0;
  	while ((op=getopt(argc, argv, "a:Pp:C:S:t:scvVd")) != -1) {
  		switch (op) {
  		case 'a':
  			ret = get_addr(optarg, (struct sockaddr *) &cb->sin);
  			break;
  		case 'P':
  			persistent_server = 1;
  			break;
  		case 'p':
  			cb->port = htons(atoi(optarg));
  			DEBUG_LOG("port %d\n", (int) atoi(optarg));
  			break;
  		case 's':
  			cb->server = 1;
  			DEBUG_LOG("server\n");
  			break;
  		case 'c':
  			cb->server = 0;
  			DEBUG_LOG("client\n");
  			break;
  		case 'S':
  			cb->size = atoi(optarg);
  			if ((cb->size < RPING_MIN_BUFSIZE) ||
  			    (cb->size > (RPING_BUFSIZE - 1))) {
  				fprintf(stderr, "Invalid size %d "
  				       "(valid range is %d to %d)\n",
  				       (int)cb->size, (int)(RPING_MIN_BUFSIZE),
  				       (int)(RPING_BUFSIZE));
  				ret = EINVAL;
  			} else
  				DEBUG_LOG("size %d\n", (int) atoi(optarg));
  			break;
  		case 'C':
  			cb->count = atoi(optarg);
  			if (cb->count < 0) {
  				fprintf(stderr, "Invalid count %d\n",
  					cb->count);
  				ret = EINVAL;
  			} else
  				DEBUG_LOG("count %d\n", (int) cb->count);
  			break;
  		case 'v':
  			cb->verbose++;
  			DEBUG_LOG("verbose\n");
  			break;
  		case 'V':
  			cb->validate++;
  			DEBUG_LOG("validate data\n");
  			break;
  		case 'd':
  			debug++;
  			break;
  		default:
  			usage("rping");
  			ret = EINVAL;
  			goto out;
  		}
  	}
  	if (ret)
  		goto out;
  
  	if (cb->server == -1) {
  		usage("rping");
  		ret = EINVAL;
  		goto out;
  	}
  
  	cb->cm_channel = rdma_create_event_channel();
  	if (!cb->cm_channel) {
  		perror("rdma_create_event_channel");
  		goto out;
  	}
  
  	ret = rdma_create_id(cb->cm_channel, &cb->cm_id, cb, RDMA_PS_TCP);
  	if (ret) {
  		perror("rdma_create_id");
  		goto out2;
  	}
  	DEBUG_LOG("created cm_id %p\n", cb->cm_id);
  
  	pthread_create(&cb->cmthread, NULL, cm_thread, cb);
  
  	if (cb->server) {
  		if (persistent_server)
  			ret = rping_run_persistent_server(cb);
  		else
  			ret = rping_run_server(cb);
  	} else
  		ret = rping_run_client(cb);
  
  	DEBUG_LOG("destroy cm_id %p\n", cb->cm_id);
  	rdma_destroy_id(cb->cm_id);
  out2:
  	rdma_destroy_event_channel(cb->cm_channel);
  out:
  	free(cb);
  	return ret;
  }
  