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1 /*
2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #if HAVE_CONFIG_H
34 #  include <config.h>
35 #endif /* HAVE_CONFIG_H */
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <unistd.h>
40 #include <string.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
43 #include <sys/time.h>
44 #include <netdb.h>
45 #include <getopt.h>
46 #include <arpa/inet.h>
47 #include <time.h>
48
49 #include "pingpong.h"
50
51 enum {
52         PINGPONG_RECV_WRID = 1,
53         PINGPONG_SEND_WRID = 2,
54 };
55
56 static int page_size;
57
58 struct pingpong_context {
59         struct ibv_context      *context;
60         struct ibv_comp_channel *channel;
61         struct ibv_pd           *pd;
62         struct ibv_mr           *mr;
63         struct ibv_cq           *cq;
64         struct ibv_qp           *qp;
65         struct ibv_ah           *ah;
66         void                    *buf;
67         int                      size;
68         int                      rx_depth;
69         int                      pending;
70         struct ibv_port_attr     portinfo;
71 };
72
73 struct pingpong_dest {
74         int lid;
75         int qpn;
76         int psn;
77         union ibv_gid gid;
78 };
79
80 static int pp_connect_ctx(struct pingpong_context *ctx, int port, int my_psn,
81                           int sl, struct pingpong_dest *dest, int sgid_idx)
82 {
83         struct ibv_ah_attr ah_attr = {
84                 .is_global     = 0,
85                 .dlid          = dest->lid,
86                 .sl            = sl,
87                 .src_path_bits = 0,
88                 .port_num      = port
89         };
90         struct ibv_qp_attr attr = {
91                 .qp_state               = IBV_QPS_RTR
92         };
93
94         if (ibv_modify_qp(ctx->qp, &attr, IBV_QP_STATE)) {
95                 fprintf(stderr, "Failed to modify QP to RTR\n");
96                 return 1;
97         }
98
99         attr.qp_state       = IBV_QPS_RTS;
100         attr.sq_psn         = my_psn;
101
102         if (ibv_modify_qp(ctx->qp, &attr,
103                           IBV_QP_STATE              |
104                           IBV_QP_SQ_PSN)) {
105                 fprintf(stderr, "Failed to modify QP to RTS\n");
106                 return 1;
107         }
108
109         if (dest->gid.global.interface_id) {
110                 ah_attr.is_global = 1;
111                 ah_attr.grh.hop_limit = 1;
112                 ah_attr.grh.dgid = dest->gid;
113                 ah_attr.grh.sgid_index = sgid_idx;
114         }
115
116         ctx->ah = ibv_create_ah(ctx->pd, &ah_attr);
117         if (!ctx->ah) {
118                 fprintf(stderr, "Failed to create AH\n");
119                 return 1;
120         }
121
122         return 0;
123 }
124
125 static struct pingpong_dest *pp_client_exch_dest(const char *servername, int port,
126                                                  const struct pingpong_dest *my_dest)
127 {
128         struct addrinfo *res, *t;
129         struct addrinfo hints = {
130                 .ai_family   = AF_INET,
131                 .ai_socktype = SOCK_STREAM
132         };
133         char *service;
134         char msg[sizeof "0000:000000:000000:00000000000000000000000000000000"];
135         int n;
136         int sockfd = -1;
137         struct pingpong_dest *rem_dest = NULL;
138         char gid[33];
139
140         if (asprintf(&service, "%d", port) < 0)
141                 return NULL;
142
143         n = getaddrinfo(servername, service, &hints, &res);
144
145         if (n < 0) {
146                 fprintf(stderr, "%s for %s:%d\n", gai_strerror(n), servername, port);
147                 free(service);
148                 return NULL;
149         }
150
151         for (t = res; t; t = t->ai_next) {
152                 sockfd = socket(t->ai_family, t->ai_socktype, t->ai_protocol);
153                 if (sockfd >= 0) {
154                         if (!connect(sockfd, t->ai_addr, t->ai_addrlen))
155                                 break;
156                         close(sockfd);
157                         sockfd = -1;
158                 }
159         }
160
161         freeaddrinfo(res);
162         free(service);
163
164         if (sockfd < 0) {
165                 fprintf(stderr, "Couldn't connect to %s:%d\n", servername, port);
166                 return NULL;
167         }
168
169         gid_to_wire_gid(&my_dest->gid, gid);
170         sprintf(msg, "%04x:%06x:%06x:%s", my_dest->lid, my_dest->qpn, my_dest->psn, gid);
171         if (write(sockfd, msg, sizeof msg) != sizeof msg) {
172                 fprintf(stderr, "Couldn't send local address\n");
173                 goto out;
174         }
175
176         if (read(sockfd, msg, sizeof msg) != sizeof msg) {
177                 perror("client read");
178                 fprintf(stderr, "Couldn't read remote address\n");
179                 goto out;
180         }
181
182         write(sockfd, "done", sizeof "done");
183
184         rem_dest = malloc(sizeof *rem_dest);
185         if (!rem_dest)
186                 goto out;
187
188         sscanf(msg, "%x:%x:%x:%s", &rem_dest->lid, &rem_dest->qpn, &rem_dest->psn, gid);
189         wire_gid_to_gid(gid, &rem_dest->gid);
190
191 out:
192         close(sockfd);
193         return rem_dest;
194 }
195
196 static struct pingpong_dest *pp_server_exch_dest(struct pingpong_context *ctx,
197                                                  int ib_port, int port, int sl,
198                                                  const struct pingpong_dest *my_dest,
199                                                  int sgid_idx)
200 {
201         struct addrinfo *res, *t;
202         struct addrinfo hints = {
203                 .ai_flags    = AI_PASSIVE,
204                 .ai_family   = AF_INET,
205                 .ai_socktype = SOCK_STREAM
206         };
207         char *service;
208         char msg[sizeof "0000:000000:000000:00000000000000000000000000000000"];
209         int n;
210         int sockfd = -1, connfd;
211         struct pingpong_dest *rem_dest = NULL;
212         char gid[33];
213
214         if (asprintf(&service, "%d", port) < 0)
215                 return NULL;
216
217         n = getaddrinfo(NULL, service, &hints, &res);
218
219         if (n < 0) {
220                 fprintf(stderr, "%s for port %d\n", gai_strerror(n), port);
221                 free(service);
222                 return NULL;
223         }
224
225         for (t = res; t; t = t->ai_next) {
226                 sockfd = socket(t->ai_family, t->ai_socktype, t->ai_protocol);
227                 if (sockfd >= 0) {
228                         n = 1;
229
230                         setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &n, sizeof n);
231
232                         if (!bind(sockfd, t->ai_addr, t->ai_addrlen))
233                                 break;
234                         close(sockfd);
235                         sockfd = -1;
236                 }
237         }
238
239         freeaddrinfo(res);
240         free(service);
241
242         if (sockfd < 0) {
243                 fprintf(stderr, "Couldn't listen to port %d\n", port);
244                 return NULL;
245         }
246
247         listen(sockfd, 1);
248         connfd = accept(sockfd, NULL, 0);
249         close(sockfd);
250         if (connfd < 0) {
251                 fprintf(stderr, "accept() failed\n");
252                 return NULL;
253         }
254
255         n = read(connfd, msg, sizeof msg);
256         if (n != sizeof msg) {
257                 perror("server read");
258                 fprintf(stderr, "%d/%d: Couldn't read remote address\n", n, (int) sizeof msg);
259                 goto out;
260         }
261
262         rem_dest = malloc(sizeof *rem_dest);
263         if (!rem_dest)
264                 goto out;
265
266         sscanf(msg, "%x:%x:%x:%s", &rem_dest->lid, &rem_dest->qpn, &rem_dest->psn, gid);
267         wire_gid_to_gid(gid, &rem_dest->gid);
268
269         if (pp_connect_ctx(ctx, ib_port, my_dest->psn, sl, rem_dest, sgid_idx)) {
270                 fprintf(stderr, "Couldn't connect to remote QP\n");
271                 free(rem_dest);
272                 rem_dest = NULL;
273                 goto out;
274         }
275
276         gid_to_wire_gid(&my_dest->gid, gid);
277         sprintf(msg, "%04x:%06x:%06x:%s", my_dest->lid, my_dest->qpn, my_dest->psn, gid);
278         if (write(connfd, msg, sizeof msg) != sizeof msg) {
279                 fprintf(stderr, "Couldn't send local address\n");
280                 free(rem_dest);
281                 rem_dest = NULL;
282                 goto out;
283         }
284
285         read(connfd, msg, sizeof msg);
286
287 out:
288         close(connfd);
289         return rem_dest;
290 }
291
292 static struct pingpong_context *pp_init_ctx(struct ibv_device *ib_dev, int size,
293                                             int rx_depth, int port,
294                                             int use_event)
295 {
296         struct pingpong_context *ctx;
297
298         ctx = malloc(sizeof *ctx);
299         if (!ctx)
300                 return NULL;
301
302         ctx->size     = size;
303         ctx->rx_depth = rx_depth;
304
305         ctx->buf = malloc(roundup(size + 40, page_size));
306         if (!ctx->buf) {
307                 fprintf(stderr, "Couldn't allocate work buf.\n");
308                 return NULL;
309         }
310
311         memset(ctx->buf, 0, size + 40);
312
313         ctx->context = ibv_open_device(ib_dev);
314         if (!ctx->context) {
315                 fprintf(stderr, "Couldn't get context for %s\n",
316                         ibv_get_device_name(ib_dev));
317                 return NULL;
318         }
319
320         if (use_event) {
321                 ctx->channel = ibv_create_comp_channel(ctx->context);
322                 if (!ctx->channel) {
323                         fprintf(stderr, "Couldn't create completion channel\n");
324                         return NULL;
325                 }
326         } else
327                 ctx->channel = NULL;
328
329         ctx->pd = ibv_alloc_pd(ctx->context);
330         if (!ctx->pd) {
331                 fprintf(stderr, "Couldn't allocate PD\n");
332                 return NULL;
333         }
334
335         ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size + 40, IBV_ACCESS_LOCAL_WRITE);
336         if (!ctx->mr) {
337                 fprintf(stderr, "Couldn't register MR\n");
338                 return NULL;
339         }
340
341         ctx->cq = ibv_create_cq(ctx->context, rx_depth + 1, NULL,
342                                 ctx->channel, 0);
343         if (!ctx->cq) {
344                 fprintf(stderr, "Couldn't create CQ\n");
345                 return NULL;
346         }
347
348         {
349                 struct ibv_qp_init_attr attr = {
350                         .send_cq = ctx->cq,
351                         .recv_cq = ctx->cq,
352                         .cap     = {
353                                 .max_send_wr  = 1,
354                                 .max_recv_wr  = rx_depth,
355                                 .max_send_sge = 1,
356                                 .max_recv_sge = 1
357                         },
358                         .qp_type = IBV_QPT_UD,
359                 };
360
361                 ctx->qp = ibv_create_qp(ctx->pd, &attr);
362                 if (!ctx->qp)  {
363                         fprintf(stderr, "Couldn't create QP\n");
364                         return NULL;
365                 }
366         }
367
368         {
369                 struct ibv_qp_attr attr = {
370                         .qp_state        = IBV_QPS_INIT,
371                         .pkey_index      = 0,
372                         .port_num        = port,
373                         .qkey            = 0x11111111
374                 };
375
376                 if (ibv_modify_qp(ctx->qp, &attr,
377                                   IBV_QP_STATE              |
378                                   IBV_QP_PKEY_INDEX         |
379                                   IBV_QP_PORT               |
380                                   IBV_QP_QKEY)) {
381                         fprintf(stderr, "Failed to modify QP to INIT\n");
382                         return NULL;
383                 }
384         }
385
386         return ctx;
387 }
388
389 int pp_close_ctx(struct pingpong_context *ctx)
390 {
391         if (ibv_destroy_qp(ctx->qp)) {
392                 fprintf(stderr, "Couldn't destroy QP\n");
393                 return 1;
394         }
395
396         if (ibv_destroy_cq(ctx->cq)) {
397                 fprintf(stderr, "Couldn't destroy CQ\n");
398                 return 1;
399         }
400
401         if (ibv_dereg_mr(ctx->mr)) {
402                 fprintf(stderr, "Couldn't deregister MR\n");
403                 return 1;
404         }
405
406         if (ibv_destroy_ah(ctx->ah)) {
407                 fprintf(stderr, "Couldn't destroy AH\n");
408                 return 1;
409         }
410
411         if (ibv_dealloc_pd(ctx->pd)) {
412                 fprintf(stderr, "Couldn't deallocate PD\n");
413                 return 1;
414         }
415
416         if (ctx->channel) {
417                 if (ibv_destroy_comp_channel(ctx->channel)) {
418                         fprintf(stderr, "Couldn't destroy completion channel\n");
419                         return 1;
420                 }
421         }
422
423         if (ibv_close_device(ctx->context)) {
424                 fprintf(stderr, "Couldn't release context\n");
425                 return 1;
426         }
427
428         free(ctx->buf);
429         free(ctx);
430
431         return 0;
432 }
433
434 static int pp_post_recv(struct pingpong_context *ctx, int n)
435 {
436         struct ibv_sge list = {
437                 .addr   = (uintptr_t) ctx->buf,
438                 .length = ctx->size + 40,
439                 .lkey   = ctx->mr->lkey
440         };
441         struct ibv_recv_wr wr = {
442                 .wr_id      = PINGPONG_RECV_WRID,
443                 .sg_list    = &list,
444                 .num_sge    = 1,
445         };
446         struct ibv_recv_wr *bad_wr;
447         int i;
448
449         for (i = 0; i < n; ++i)
450                 if (ibv_post_recv(ctx->qp, &wr, &bad_wr))
451                         break;
452
453         return i;
454 }
455
456 static int pp_post_send(struct pingpong_context *ctx, uint32_t qpn)
457 {
458         struct ibv_sge list = {
459                 .addr   = (uintptr_t) ctx->buf + 40,
460                 .length = ctx->size,
461                 .lkey   = ctx->mr->lkey
462         };
463         struct ibv_send_wr wr = {
464                 .wr_id      = PINGPONG_SEND_WRID,
465                 .sg_list    = &list,
466                 .num_sge    = 1,
467                 .opcode     = IBV_WR_SEND,
468                 .send_flags = IBV_SEND_SIGNALED,
469                 .wr         = {
470                         .ud = {
471                                  .ah          = ctx->ah,
472                                  .remote_qpn  = qpn,
473                                  .remote_qkey = 0x11111111
474                          }
475                 }
476         };
477         struct ibv_send_wr *bad_wr;
478
479         return ibv_post_send(ctx->qp, &wr, &bad_wr);
480 }
481
482 static void usage(const char *argv0)
483 {
484         printf("Usage:\n");
485         printf("  %s            start a server and wait for connection\n", argv0);
486         printf("  %s <host>     connect to server at <host>\n", argv0);
487         printf("\n");
488         printf("Options:\n");
489         printf("  -p, --port=<port>      listen on/connect to port <port> (default 18515)\n");
490         printf("  -d, --ib-dev=<dev>     use IB device <dev> (default first device found)\n");
491         printf("  -i, --ib-port=<port>   use port <port> of IB device (default 1)\n");
492         printf("  -s, --size=<size>      size of message to exchange (default 1024)\n");
493         printf("  -r, --rx-depth=<dep>   number of receives to post at a time (default 500)\n");
494         printf("  -n, --iters=<iters>    number of exchanges (default 1000)\n");
495         printf("  -e, --events           sleep on CQ events (default poll)\n");
496         printf("  -g, --gid-idx=<gid index> local port gid index\n");
497 }
498
499 int main(int argc, char *argv[])
500 {
501         struct ibv_device      **dev_list;
502         struct ibv_device       *ib_dev;
503         struct pingpong_context *ctx;
504         struct pingpong_dest     my_dest;
505         struct pingpong_dest    *rem_dest;
506         struct timeval           start, end;
507         char                    *ib_devname = NULL;
508         char                    *servername = NULL;
509         int                      port = 18515;
510         int                      ib_port = 1;
511         int                      size = 1024;
512         int                      rx_depth = 500;
513         int                      iters = 1000;
514         int                      use_event = 0;
515         int                      routs;
516         int                      rcnt, scnt;
517         int                      num_cq_events = 0;
518         int                      sl = 0;
519         int                      gidx = -1;
520         char                     gid[33];
521
522         srand48(getpid() * time(NULL));
523
524         while (1) {
525                 int c;
526
527                 static struct option long_options[] = {
528                         { .name = "port",     .has_arg = 1, .val = 'p' },
529                         { .name = "ib-dev",   .has_arg = 1, .val = 'd' },
530                         { .name = "ib-port",  .has_arg = 1, .val = 'i' },
531                         { .name = "size",     .has_arg = 1, .val = 's' },
532                         { .name = "rx-depth", .has_arg = 1, .val = 'r' },
533                         { .name = "iters",    .has_arg = 1, .val = 'n' },
534                         { .name = "sl",       .has_arg = 1, .val = 'l' },
535                         { .name = "events",   .has_arg = 0, .val = 'e' },
536                         { .name = "gid-idx",  .has_arg = 1, .val = 'g' },
537                         { 0 }
538                 };
539
540                 c = getopt_long(argc, argv, "p:d:i:s:r:n:l:eg:", long_options, NULL);
541                 if (c == -1)
542                         break;
543
544                 switch (c) {
545                 case 'p':
546                         port = strtol(optarg, NULL, 0);
547                         if (port < 0 || port > 65535) {
548                                 usage(argv[0]);
549                                 return 1;
550                         }
551                         break;
552
553                 case 'd':
554                         ib_devname = strdup(optarg);
555                         break;
556
557                 case 'i':
558                         ib_port = strtol(optarg, NULL, 0);
559                         if (ib_port < 0) {
560                                 usage(argv[0]);
561                                 return 1;
562                         }
563                         break;
564
565                 case 's':
566                         size = strtol(optarg, NULL, 0);
567                         break;
568
569                 case 'r':
570                         rx_depth = strtol(optarg, NULL, 0);
571                         break;
572
573                 case 'n':
574                         iters = strtol(optarg, NULL, 0);
575                         break;
576
577                 case 'l':
578                         sl = strtol(optarg, NULL, 0);
579                         break;
580
581                 case 'e':
582                         ++use_event;
583                         break;
584
585                 case 'g':
586                         gidx = strtol(optarg, NULL, 0);
587                         break;
588
589                 default:
590                         usage(argv[0]);
591                         return 1;
592                 }
593         }
594
595         if (optind == argc - 1)
596                 servername = strdup(argv[optind]);
597         else if (optind < argc) {
598                 usage(argv[0]);
599                 return 1;
600         }
601
602         page_size = sysconf(_SC_PAGESIZE);
603
604         dev_list = ibv_get_device_list(NULL);
605         if (!dev_list) {
606                 perror("Failed to get IB devices list");
607                 return 1;
608         }
609
610         if (!ib_devname) {
611                 ib_dev = *dev_list;
612                 if (!ib_dev) {
613                         fprintf(stderr, "No IB devices found\n");
614                         return 1;
615                 }
616         } else {
617                 int i;
618                 for (i = 0; dev_list[i]; ++i)
619                         if (!strcmp(ibv_get_device_name(dev_list[i]), ib_devname))
620                                 break;
621                 ib_dev = dev_list[i];
622                 if (!ib_dev) {
623                         fprintf(stderr, "IB device %s not found\n", ib_devname);
624                         return 1;
625                 }
626         }
627
628         ctx = pp_init_ctx(ib_dev, size, rx_depth, ib_port, use_event);
629         if (!ctx)
630                 return 1;
631
632         routs = pp_post_recv(ctx, ctx->rx_depth);
633         if (routs < ctx->rx_depth) {
634                 fprintf(stderr, "Couldn't post receive (%d)\n", routs);
635                 return 1;
636         }
637
638         if (use_event)
639                 if (ibv_req_notify_cq(ctx->cq, 0)) {
640                         fprintf(stderr, "Couldn't request CQ notification\n");
641                         return 1;
642                 }
643
644         if (pp_get_port_info(ctx->context, ib_port, &ctx->portinfo)) {
645                 fprintf(stderr, "Couldn't get port info\n");
646                 return 1;
647         }
648         my_dest.lid = ctx->portinfo.lid;
649
650         my_dest.qpn = ctx->qp->qp_num;
651         my_dest.psn = lrand48() & 0xffffff;
652
653         if (gidx >= 0) {
654                 if (ibv_query_gid(ctx->context, ib_port, gidx, &my_dest.gid)) {
655                         fprintf(stderr, "Could not get local gid for gid index %d\n", gidx);
656                         return 1;
657                 }
658         } else
659                 memset(&my_dest.gid, 0, sizeof my_dest.gid);
660
661         inet_ntop(AF_INET6, &my_dest.gid, gid, sizeof gid);
662         printf("  local address:  LID 0x%04x, QPN 0x%06x, PSN 0x%06x: GID %s\n",
663                my_dest.lid, my_dest.qpn, my_dest.psn, gid);
664
665         if (servername)
666                 rem_dest = pp_client_exch_dest(servername, port, &my_dest);
667         else
668                 rem_dest = pp_server_exch_dest(ctx, ib_port, port, sl, &my_dest, gidx);
669
670         if (!rem_dest)
671                 return 1;
672
673         inet_ntop(AF_INET6, &rem_dest->gid, gid, sizeof gid);
674         printf("  remote address: LID 0x%04x, QPN 0x%06x, PSN 0x%06x, GID %s\n",
675                rem_dest->lid, rem_dest->qpn, rem_dest->psn, gid);
676
677         if (servername)
678                 if (pp_connect_ctx(ctx, ib_port, my_dest.psn, sl, rem_dest, gidx))
679                         return 1;
680
681         ctx->pending = PINGPONG_RECV_WRID;
682
683         if (servername) {
684                 if (pp_post_send(ctx, rem_dest->qpn)) {
685                         fprintf(stderr, "Couldn't post send\n");
686                         return 1;
687                 }
688                 ctx->pending |= PINGPONG_SEND_WRID;
689         }
690
691         if (gettimeofday(&start, NULL)) {
692                 perror("gettimeofday");
693                 return 1;
694         }
695
696         rcnt = scnt = 0;
697         while (rcnt < iters || scnt < iters) {
698                 if (use_event) {
699                         struct ibv_cq *ev_cq;
700                         void          *ev_ctx;
701
702                         if (ibv_get_cq_event(ctx->channel, &ev_cq, &ev_ctx)) {
703                                 fprintf(stderr, "Failed to get cq_event\n");
704                                 return 1;
705                         }
706
707                         ++num_cq_events;
708
709                         if (ev_cq != ctx->cq) {
710                                 fprintf(stderr, "CQ event for unknown CQ %p\n", ev_cq);
711                                 return 1;
712                         }
713
714                         if (ibv_req_notify_cq(ctx->cq, 0)) {
715                                 fprintf(stderr, "Couldn't request CQ notification\n");
716                                 return 1;
717                         }
718                 }
719
720                 {
721                         struct ibv_wc wc[2];
722                         int ne, i;
723
724                         do {
725                                 ne = ibv_poll_cq(ctx->cq, 2, wc);
726                                 if (ne < 0) {
727                                         fprintf(stderr, "poll CQ failed %d\n", ne);
728                                         return 1;
729                                 }
730                         } while (!use_event && ne < 1);
731
732                         for (i = 0; i < ne; ++i) {
733                                 if (wc[i].status != IBV_WC_SUCCESS) {
734                                         fprintf(stderr, "Failed status %s (%d) for wr_id %d\n",
735                                                 ibv_wc_status_str(wc[i].status),
736                                                 wc[i].status, (int) wc[i].wr_id);
737                                         return 1;
738                                 }
739
740                                 switch ((int) wc[i].wr_id) {
741                                 case PINGPONG_SEND_WRID:
742                                         ++scnt;
743                                         break;
744
745                                 case PINGPONG_RECV_WRID:
746                                         if (--routs <= 1) {
747                                                 routs += pp_post_recv(ctx, ctx->rx_depth - routs);
748                                                 if (routs < ctx->rx_depth) {
749                                                         fprintf(stderr,
750                                                                 "Couldn't post receive (%d)\n",
751                                                                 routs);
752                                                         return 1;
753                                                 }
754                                         }
755
756                                         ++rcnt;
757                                         break;
758
759                                 default:
760                                         fprintf(stderr, "Completion for unknown wr_id %d\n",
761                                                 (int) wc[i].wr_id);
762                                         return 1;
763                                 }
764
765                                 ctx->pending &= ~(int) wc[i].wr_id;
766                                 if (scnt < iters && !ctx->pending) {
767                                         if (pp_post_send(ctx, rem_dest->qpn)) {
768                                                 fprintf(stderr, "Couldn't post send\n");
769                                                 return 1;
770                                         }
771                                         ctx->pending = PINGPONG_RECV_WRID |
772                                                        PINGPONG_SEND_WRID;
773                                 }
774                         }
775                 }
776         }
777
778         if (gettimeofday(&end, NULL)) {
779                 perror("gettimeofday");
780                 return 1;
781         }
782
783         {
784                 float usec = (end.tv_sec - start.tv_sec) * 1000000 +
785                         (end.tv_usec - start.tv_usec);
786                 long long bytes = (long long) size * iters * 2;
787
788                 printf("%lld bytes in %.2f seconds = %.2f Mbit/sec\n",
789                        bytes, usec / 1000000., bytes * 8. / usec);
790                 printf("%d iters in %.2f seconds = %.2f usec/iter\n",
791                        iters, usec / 1000000., usec / iters);
792         }
793
794         ibv_ack_cq_events(ctx->cq, num_cq_events);
795
796         if (pp_close_ctx(ctx))
797                 return 1;
798
799         ibv_free_device_list(dev_list);
800         free(rem_dest);
801
802         return 0;
803 }