Source

mpi3-fortran / ompi / mca / btl / openib / connect / btl_openib_connect_sl.c

Full commit
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
/*
 * Copyright (c) 2011      Mellanox Technologies.  All rights reserved.
 *
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */

#include "btl_openib.h"

#include "connect/btl_openib_connect_sl.h"
#include <infiniband/iba/ib_types.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#define SL_NOT_PRESENT                0xFF
#define MAX_GET_SL_REC_RETRIES        20
#define GET_SL_REC_RETRIES_TIMEOUT_MS 2000000

static struct mca_btl_openib_sa_qp_cache {
    /* There will be a MR with the one send and receive buffer together */
    /* The send buffer is first, the receive buffer is second */
    /* The receive buffer in a UD queue pair needs room for the 40 byte GRH */
    /* The buffers are first in the structure for page alignment */
    char     send_recv_buffer[MAD_BLOCK_SIZE * 2 + 40];
    struct   mca_btl_openib_sa_qp_cache *next;
    struct   ibv_context *context;
    char     *device_name;
    uint32_t port_num;
    struct   ibv_qp *qp;
    struct   ibv_ah *ah;
    struct   ibv_cq *cq;
    struct   ibv_mr *mr;
    struct   ibv_pd *pd;
    struct   ibv_recv_wr rwr;
    struct   ibv_sge rsge;
    uint8_t  sl_values[65536]; /* 64K */
} *sa_qp_cache = 0;

static int init_ud_qp(
                struct ibv_context *context_arg,
                struct mca_btl_openib_sa_qp_cache *cache);

static void init_sa_mad(
                struct mca_btl_openib_sa_qp_cache *cache,
                ib_sa_mad_t *sa_mad,
                struct ibv_send_wr *swr,
                struct ibv_sge *ssge,
                uint16_t lid,
                uint16_t rem_lid);

static int get_pathrecord_info(
                struct mca_btl_openib_sa_qp_cache *cache,
                ib_sa_mad_t *sa_mad,
                ib_sa_mad_t *sar,
                struct ibv_send_wr *swr,
                uint16_t lid,
                uint16_t rem_lid);

static int init_device(
                struct ibv_context *context_arg,
                struct mca_btl_openib_sa_qp_cache *cache,
                uint32_t port_num);

/*=================================================================*/

static void free_sa_qp_cache(void)
{
    struct mca_btl_openib_sa_qp_cache *cache, *tmp;

    cache = sa_qp_cache;
    while (NULL != cache) {
        /* free cache data */
        if (cache->device_name)
            free(cache->device_name);
        if (NULL != cache->qp)
            ibv_destroy_qp(cache->qp);
        if (NULL != cache->ah)
            ibv_destroy_ah(cache->ah);
        if (NULL != cache->cq)
            ibv_destroy_cq(cache->cq);
        if (NULL != cache->mr)
            ibv_dereg_mr(cache->mr);
        if (NULL != cache->pd)
            ibv_dealloc_pd(cache->pd);
        tmp = cache->next;
        free(cache);
        cache = tmp;
    }
    sa_qp_cache = NULL;
}

/*=================================================================*/

static int init_ud_qp(struct ibv_context *context_arg,
                      struct mca_btl_openib_sa_qp_cache *cache)
{
    struct ibv_qp_init_attr iattr;
    struct ibv_qp_attr mattr;
    int rc;

    /* create cq */
    cache->cq = ibv_create_cq(cache->context, 4, NULL, NULL, 0);
    if (NULL == cache->cq) {
        BTL_ERROR(("error creating cq, errno says %s", strerror(errno)));
        ompi_show_help("help-mpi-btl-openib.txt", "init-fail-create-q",
                true, ompi_process_info.nodename,
                __FILE__, __LINE__, "ibv_create_cq",
                strerror(errno), errno,
                ibv_get_device_name(context_arg->device));
        return OMPI_ERROR;
    }

    /* create qp */
    memset(&iattr, 0, sizeof(iattr));
    iattr.send_cq = cache->cq;
    iattr.recv_cq = cache->cq;
    iattr.cap.max_send_wr = 2;
    iattr.cap.max_recv_wr = 2;
    iattr.cap.max_send_sge = 1;
    iattr.cap.max_recv_sge = 1;
    iattr.qp_type = IBV_QPT_UD;
    cache->qp = ibv_create_qp(cache->pd, &iattr);
    if (NULL == cache->qp) {
        BTL_ERROR(("error creating qp %s (%d)", strerror(errno), errno));
        return OMPI_ERROR;
    }

    /* modify qp to IBV_QPS_INIT */
    memset(&mattr, 0, sizeof(mattr));
    mattr.qp_state = IBV_QPS_INIT;
    mattr.port_num = cache->port_num;
    mattr.qkey = ntohl(IB_QP1_WELL_KNOWN_Q_KEY);
    rc = ibv_modify_qp(cache->qp, &mattr,
            IBV_QP_STATE              |
            IBV_QP_PKEY_INDEX         |
            IBV_QP_PORT               |
            IBV_QP_QKEY);
    if (rc) {
        BTL_ERROR(("Error modifying QP[%x] to IBV_QPS_INIT errno says: %s [%d]",
                    cache->qp->qp_num, strerror(errno), errno));
        return OMPI_ERROR;
    }

    /* modify qp to IBV_QPS_RTR */
    memset(&mattr, 0, sizeof(mattr));
    mattr.qp_state = IBV_QPS_RTR;
    rc = ibv_modify_qp(cache->qp, &mattr, IBV_QP_STATE);
    if (rc) {
        BTL_ERROR(("Error modifying QP[%x] to IBV_QPS_RTR errno says: %s [%d]",
                    cache->qp->qp_num, strerror(errno), errno));
        return OMPI_ERROR;
    }

    /* modify qp to IBV_QPS_RTS */
    mattr.qp_state = IBV_QPS_RTS;
    rc = ibv_modify_qp(cache->qp, &mattr, IBV_QP_STATE | IBV_QP_SQ_PSN);
    if (rc) {
        BTL_ERROR(("Error modifying QP[%x] to IBV_QPS_RTR errno says: %s [%d]",
                    cache->qp->qp_num, strerror(errno), errno));
        return OMPI_ERROR;
    }

    return OMPI_SUCCESS;
}

/*=================================================================*/

static void init_sa_mad(struct mca_btl_openib_sa_qp_cache *cache,
                       ib_sa_mad_t *sa_mad,
                       struct ibv_send_wr *swr,
                       struct ibv_sge *ssge,
                       uint16_t lid,
                       uint16_t rem_lid)
{
    ib_path_rec_t *path_record = (ib_path_rec_t*)sa_mad->data;

    memset(swr, 0, sizeof(*swr));
    memset(ssge, 0, sizeof(*ssge));

    /* Initialize the standard MAD header. */
    memset(sa_mad, 0, MAD_BLOCK_SIZE);
    ib_mad_init_new((ib_mad_t *)sa_mad,          /* mad header pointer */
                    IB_MCLASS_SUBN_ADM,          /* management class */
                    (uint8_t) 2,                 /* version */
                    IB_MAD_METHOD_GET,           /* method */
                    hton64((uint64_t)lid << 48 | /* transaction ID */
                           (uint64_t)rem_lid << 32 |
                           (uint64_t)cache->qp->qp_num << 8),
                    IB_MAD_ATTR_PATH_RECORD,     /* attribute ID */
                    0);                          /* attribute modifier */

    sa_mad->comp_mask = IB_PR_COMPMASK_DLID | IB_PR_COMPMASK_SLID;
    path_record->dlid = htons(rem_lid);
    path_record->slid = htons(lid);

    swr->sg_list = ssge;
    swr->num_sge = 1;
    swr->opcode = IBV_WR_SEND;
    swr->wr.ud.ah = cache->ah;
    swr->wr.ud.remote_qpn = ntohl(IB_QP1);
    swr->wr.ud.remote_qkey = ntohl(IB_QP1_WELL_KNOWN_Q_KEY);
    swr->send_flags = IBV_SEND_SIGNALED | IBV_SEND_SOLICITED;

    ssge->addr = (uint64_t)(void *)sa_mad;
    ssge->length = MAD_BLOCK_SIZE;
    ssge->lkey = cache->mr->lkey;
}

/*=================================================================*/

static int get_pathrecord_info(struct mca_btl_openib_sa_qp_cache *cache,
                             ib_sa_mad_t *req_mad,
                             ib_sa_mad_t *resp_mad,
                             struct ibv_send_wr *swr,
                             uint16_t lid,
                             uint16_t rem_lid)
{
    struct ibv_send_wr *bswr;
    struct ibv_wc wc;
    struct timeval get_sl_rec_last_sent, get_sl_rec_last_poll;
    struct ibv_recv_wr *brwr;
    int got_sl_value, get_sl_rec_retries, rc, ne, i;
    ib_path_rec_t *req_path_record = ib_sa_mad_get_payload_ptr(req_mad);
    ib_path_rec_t *resp_path_record = ib_sa_mad_get_payload_ptr(resp_mad);

    got_sl_value = 0;
    get_sl_rec_retries = 0;

    rc = ibv_post_recv(cache->qp, &(cache->rwr), &brwr);
    if (0 != rc) {
        BTL_ERROR(("error posting receive on QP [0x%x] errno says: %s [%d]",
                   cache->qp->qp_num, strerror(errno), errno));
        return OMPI_ERROR;
    }

    while (0 == got_sl_value) {
        rc = ibv_post_send(cache->qp, swr, &bswr);
        if (0 != rc) {
            BTL_ERROR(("error posting send on QP [0x%x] errno says: %s [%d]",
                       cache->qp->qp_num, strerror(errno), errno));
            return OMPI_ERROR;
        }
        gettimeofday(&get_sl_rec_last_sent, NULL);

        while (0 == got_sl_value) {
            ne = ibv_poll_cq(cache->cq, 1, &wc);
            if (ne > 0 &&
                IBV_WC_SUCCESS == wc.status &&
                IBV_WC_RECV == wc.opcode &&
                wc.byte_len >= MAD_BLOCK_SIZE &&
                resp_mad->trans_id == req_mad->trans_id) {
                if (0 == resp_mad->status &&
                    req_path_record->slid == htons(lid) &&
                    req_path_record->dlid == htons(rem_lid)) {
                    /* Everything matches, so we have the desired SL */
                    cache->sl_values[rem_lid] = ib_path_rec_sl(resp_path_record);
                    got_sl_value = 1; /* still must repost recieve buf */
                } else {
                    /* Probably bad status, unlikely bad lid match. We will */
                    /* ignore response and let it time out so that we do a  */
                    /* retry, but after a delay. We must make a new TID so  */
                    /* the SM doesn't see it as the same request.           */
                    req_mad->trans_id += hton64(1);
                }
                rc = ibv_post_recv(cache->qp, &(cache->rwr), &brwr);
                if (0 != rc) {
                    BTL_ERROR(("error posing receive on QP[%x] errno says: %s [%d]",
                               cache->qp->qp_num, strerror(errno), errno));
                    return OMPI_ERROR;
                }
            } else if (0 == ne) {    /* poll did not find anything */
                gettimeofday(&get_sl_rec_last_poll, NULL);
                i = get_sl_rec_last_poll.tv_sec - get_sl_rec_last_sent.tv_sec;
                i = (i * 1000000) +
                    get_sl_rec_last_poll.tv_usec - get_sl_rec_last_sent.tv_usec;
                if (i > GET_SL_REC_RETRIES_TIMEOUT_MS) {
                    get_sl_rec_retries++;
                    BTL_VERBOSE(("[%d/%d] retries to get PathRecord",
                            get_sl_rec_retries, MAX_GET_SL_REC_RETRIES));
                    if (get_sl_rec_retries > MAX_GET_SL_REC_RETRIES) {
                        BTL_ERROR(("No response from SA after %d retries",
                                MAX_GET_SL_REC_RETRIES));
                        return OMPI_ERROR;
                    }
                    break;  /* retransmit request */
                }
                usleep(100);  /* otherwise pause before polling again */
            } else if (ne < 0) {
                BTL_ERROR(("error polling CQ with %d: %s\n",
                    ne, strerror(errno)));
                return OMPI_ERROR;
            }
        }
    }
    return 0;
}

/*=================================================================*/

static int init_device(struct ibv_context *context_arg,
                       struct mca_btl_openib_sa_qp_cache *cache,
                       uint32_t port_num)
{
    struct ibv_ah_attr aattr;
    struct ibv_port_attr pattr;
    int rc;

    cache->context = ibv_open_device(context_arg->device);
    if (NULL == cache->context) {
        BTL_ERROR(("error obtaining device context for %s errno says %s",
                    ibv_get_device_name(context_arg->device), strerror(errno)));
        return OMPI_ERROR;
    }
    cache->device_name = strdup(ibv_get_device_name(cache->context->device));
    cache->port_num = port_num;

    /* init all sl_values to be SL_NOT_PRESENT */
    memset(&cache->sl_values, SL_NOT_PRESENT, sizeof(cache->sl_values));

    cache->next = sa_qp_cache;
    sa_qp_cache = cache;

    /* allocate the protection domain for the device */
    cache->pd = ibv_alloc_pd(cache->context);
    if (NULL == cache->pd) {
        BTL_ERROR(("error allocating protection domain for %s errno says %s",
                    ibv_get_device_name(context_arg->device), strerror(errno)));
        return OMPI_ERROR;
    }

    /* register memory region */
    cache->mr = ibv_reg_mr(cache->pd, cache->send_recv_buffer,
            sizeof(cache->send_recv_buffer),
            IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_LOCAL_WRITE);
    if (NULL == cache->mr) {
        BTL_ERROR(("error registering memory region, errno says %s", strerror(errno)));
        return OMPI_ERROR;
    }

    /* init the ud qp */
    rc = init_ud_qp(context_arg, cache);
    if (OMPI_ERROR == rc) {
        return OMPI_ERROR;
    }

    rc = ibv_query_port(cache->context, cache->port_num, &pattr);
    if (rc) {
        BTL_ERROR(("error getting port attributes for device %s "
                    "port number %d errno says %s",
                    ibv_get_device_name(context_arg->device),
                    cache->port_num, strerror(errno)));
        return OMPI_ERROR;
    }

    /* create address handle  */
    memset(&aattr, 0, sizeof(aattr));
    aattr.dlid = pattr.sm_lid;
    aattr.sl = pattr.sm_sl;
    aattr.port_num = cache->port_num;
    cache->ah = ibv_create_ah(cache->pd, &aattr);
    if (NULL == cache->ah) {
        BTL_ERROR(("error creating address handle: %s", strerror(errno)));
        return OMPI_ERROR;
    }

    memset(&(cache->rwr), 0, sizeof(cache->rwr));
    cache->rwr.num_sge = 1;
    cache->rwr.sg_list = &(cache->rsge);
    memset(&(cache->rsge), 0, sizeof(cache->rsge));
    cache->rsge.addr = (uint64_t)(void *)
        (cache->send_recv_buffer + MAD_BLOCK_SIZE);
    cache->rsge.length = MAD_BLOCK_SIZE + 40;
    cache->rsge.lkey = cache->mr->lkey;

    return 0;
}

/*=================================================================*/

static int get_pathrecord_sl(struct ibv_context *context_arg,
                      uint32_t port_num,
                      uint16_t lid,
                      uint16_t rem_lid)
{
    struct ibv_send_wr swr;
    ib_sa_mad_t *req_mad, *resp_mad;
    struct ibv_sge ssge;
    struct mca_btl_openib_sa_qp_cache *cache;
    long page_size = sysconf(_SC_PAGESIZE);
    int rc;

    /* search for a cached item */
    for (cache = sa_qp_cache; cache; cache = cache->next) {
        if (0 == strcmp(cache->device_name,
                    ibv_get_device_name(context_arg->device))
                && cache->port_num == port_num) {
            break;
        }
    }

    if (NULL == cache) {
        /* init new cache */
        if (posix_memalign((void **)(&cache), page_size,
                    sizeof(struct mca_btl_openib_sa_qp_cache))) {
            BTL_ERROR(("error in posix_memalign SA cache"));
            return OMPI_ERROR;
        }
        /* one time setup for each device/port combination */
        rc = init_device(context_arg, cache, port_num);
        if (0 != rc) {
            return rc;
        }
    }

    /* if the destination lid SL value is not in the cache, go get it */
    if (SL_NOT_PRESENT == cache->sl_values[rem_lid]) {
        /* sa_mad is first buffer, where we build the SA Get request to send */
        req_mad = (ib_sa_mad_t *)(cache->send_recv_buffer);

        init_sa_mad(cache, req_mad, &swr, &ssge, lid, rem_lid);

        /* resp_mad is the receive buffer (40 byte offset is for GRH) */
        resp_mad = (ib_sa_mad_t *)(cache->send_recv_buffer + MAD_BLOCK_SIZE + 40);

        rc = get_pathrecord_info(cache, req_mad, resp_mad, &swr, lid, rem_lid);
        if (0 != rc) {
            return rc;
        }
    }

    /* now all we do is send back the value laying around */
    return cache->sl_values[rem_lid];
}

/*=================================================================*/

int btl_openib_connect_get_pathrecord_sl(struct ibv_context *context_arg,
                                     uint32_t port_num,
                                     uint16_t lid,
                                     uint16_t rem_lid)
{
    int rc = get_pathrecord_sl(context_arg, port_num, lid, rem_lid);
    if (OMPI_ERROR == rc) {
            free_sa_qp_cache();
    }
    return rc;
}

/*=================================================================*/

void btl_openib_connect_sl_finalize()
{
        free_sa_qp_cache();
}