ctdb/ib/ibwrapper.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Wrap Infiniband calls.
   4  *
   5  * Copyright (C) Sven Oehme <oehmes@de.ibm.com> 2006
   6  *
   7  * Major code contributions by Peter Somogyi <psomogyi@gamax.hu>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <sys/types.h>
  29 #include <netinet/in.h>
  30 #include <sys/socket.h>
  31 #include <netdb.h>
  32 #include <arpa/inet.h>
  33 #include <malloc.h>
  34 #include <assert.h>
  35 #include <unistd.h>
  36
  37 #include "includes.h"
  38 #include "lib/events/events.h"
  39 #include "ibwrapper.h"
  40
  41 #include <rdma/rdma_cma.h>
  42 #include "infiniband/sa-kern-abi.h"
  43
  44 #include "ibwrapper_internal.h"
  45 #include "lib/util/dlinklist.h"
  46
  47 #define IBW_LASTERR_BUFSIZE 512
  48 static char ibw_lasterr[IBW_LASTERR_BUFSIZE];
  49
  50 #define IBW_MAX_SEND_WR 256
  51 #define IBW_MAX_RECV_WR 1024
  52 #define IBW_RECV_BUFSIZE 256
  53 #define IBW_RECV_THRESHOLD (1 * 1024 * 1024)
  54
  55 static void ibw_event_handler_verbs(struct event_context *ev,
  56         struct fd_event *fde, uint16_t flags, void *private_data);
  57 static int ibw_fill_cq(struct ibw_conn *conn);
  58 static int ibw_wc_recv(struct ibw_conn *conn, struct ibv_wc *wc);
  59 static int ibw_wc_send(struct ibw_conn *conn, struct ibv_wc *wc);
  60 static int ibw_send_packet(struct ibw_conn *conn, void *buf, struct ibw_wr *p, uint32_t len);
  61
  62 static void *ibw_alloc_mr(struct ibw_ctx_priv *pctx, struct ibw_conn_priv *pconn,
  63         uint32_t n, struct ibv_mr **ppmr)
  64 {
  65         void *buf;
  66
  67         DEBUG(10, ("ibw_alloc_mr(cmid=%p, n=%u)\n", pconn->cm_id, n));
  68         buf = memalign(pctx->pagesize, n);
  69         if (!buf) {
  70                 sprintf(ibw_lasterr, "couldn't allocate memory\n");
  71                 return NULL;
  72         }
  73
  74         *ppmr = ibv_reg_mr(pconn->pd, buf, n, IBV_ACCESS_LOCAL_WRITE);
  75         if (!*ppmr) {
  76                 sprintf(ibw_lasterr, "couldn't allocate mr\n");
  77                 free(buf);
  78                 return NULL;
  79         }
  80
  81         return buf;
  82 }
  83
  84 static void ibw_free_mr(char **ppbuf, struct ibv_mr **ppmr)
  85 {
  86         DEBUG(10, ("ibw_free_mr(%u %u)\n", (uint32_t)*ppbuf, (uint32_t)*ppmr));
  87         if (*ppmr!=NULL) {
  88                 ibv_dereg_mr(*ppmr);
  89                 *ppmr = NULL;
  90         }
  91         if (*ppbuf) {
  92                 free(*ppbuf);
  93                 *ppbuf = NULL;
  94         }
  95 }
  96
  97 static int ibw_init_memory(struct ibw_conn *conn)
  98 {
  99         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 100         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 101         struct ibw_opts *opts = &pctx->opts;
 102         int     i;
 103         struct ibw_wr   *p;
 104
 105         DEBUG(10, ("ibw_init_memory(cmid: %p)\n", pconn->cm_id));
 106         pconn->buf_send = ibw_alloc_mr(pctx, pconn,
 107                 opts->max_send_wr * opts->recv_bufsize, &pconn->mr_send);
 108         if (!pconn->buf_send) {
 109                 sprintf(ibw_lasterr, "couldn't allocate work send buf\n");
 110                 return -1;
 111         }
 112
 113         pconn->buf_recv = ibw_alloc_mr(pctx, pconn,
 114                 opts->max_recv_wr * opts->recv_bufsize, &pconn->mr_recv);
 115         if (!pconn->buf_recv) {
 116                 sprintf(ibw_lasterr, "couldn't allocate work recv buf\n");
 117                 return -1;
 118         }
 119
 120         pconn->wr_index = talloc_size(pconn, opts->max_send_wr * sizeof(struct ibw_wr *));
 121         assert(pconn->wr_index!=NULL);
 122
 123         for(i=0; i<opts->max_send_wr; i++) {
 124                 p = pconn->wr_index[i] = talloc_zero(pconn, struct ibw_wr);
 125                 p->buf = pconn->buf_send + (i * opts->recv_bufsize);
 126                 p->wr_id = i;
 127
 128                 DLIST_ADD(pconn->wr_list_avail, p);
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int ibw_ctx_priv_destruct(struct ibw_ctx_priv *pctx)
 135 {
 136         DEBUG(10, ("ibw_ctx_priv_destruct(%u)\n", (uint32_t)pctx));
 137
 138         /* destroy cm */
 139         if (pctx->cm_channel) {
 140                 rdma_destroy_event_channel(pctx->cm_channel);
 141                 pctx->cm_channel = NULL;
 142         }
 143         if (pctx->cm_channel_event) {
 144                 /* TODO: do we have to do this here? */
 145                 talloc_free(pctx->cm_channel_event);
 146                 pctx->cm_channel_event = NULL;
 147         }
 148         if (pctx->cm_id) {
 149                 rdma_destroy_id(pctx->cm_id);
 150                 pctx->cm_id = NULL;
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int ibw_ctx_destruct(struct ibw_ctx *ctx)
 157 {
 158         DEBUG(10, ("ibw_ctx_destruct(%u)\n", (uint32_t)ctx));
 159         return 0;
 160 }
 161
 162 static int ibw_conn_priv_destruct(struct ibw_conn_priv *pconn)
 163 {
 164         DEBUG(10, ("ibw_conn_priv_destruct(%p, cmid: %p)\n",
 165                 pconn, pconn->cm_id));
 166
 167         /* pconn->wr_index is freed by talloc */
 168         /* pconn->wr_index[i] are freed by talloc */
 169
 170         /* destroy verbs */
 171         if (pconn->cm_id!=NULL && pconn->cm_id->qp!=NULL) {
 172                 rdma_destroy_qp(pconn->cm_id);
 173                 pconn->cm_id->qp = NULL;
 174         }
 175
 176         if (pconn->cq!=NULL) {
 177                 ibv_destroy_cq(pconn->cq);
 178                 pconn->cq = NULL;
 179         }
 180
 181         if (pconn->verbs_channel!=NULL) {
 182                 ibv_destroy_comp_channel(pconn->verbs_channel);
 183                 pconn->verbs_channel = NULL;
 184         }
 185
 186         /* must be freed here because its order is important */
 187         if (pconn->verbs_channel_event) {
 188                 talloc_free(pconn->verbs_channel_event);
 189                 pconn->verbs_channel_event = NULL;
 190         }
 191
 192         /* free memory regions */
 193         ibw_free_mr(&pconn->buf_send, &pconn->mr_send);
 194         ibw_free_mr(&pconn->buf_recv, &pconn->mr_recv);
 195
 196         if (pconn->pd) {
 197                 ibv_dealloc_pd(pconn->pd);
 198                 pconn->pd = NULL;
 199                 DEBUG(10, ("pconn=%p pd deallocated\n", pconn));
 200         }
 201
 202         if (pconn->cm_id) {
 203                 rdma_destroy_id(pconn->cm_id);
 204                 pconn->cm_id = NULL;
 205                 DEBUG(10, ("pconn=%p cm_id destroyed\n", pconn));
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int ibw_wr_destruct(struct ibw_wr *wr)
 212 {
 213         if (wr->buf_large!=NULL)
 214                 ibw_free_mr(&wr->buf_large, &wr->mr_large);
 215         return 0;
 216 }
 217
 218 static int ibw_conn_destruct(struct ibw_conn *conn)
 219 {
 220         DEBUG(10, ("ibw_conn_destruct(%u)\n", (uint32_t)conn));
 221
 222         /* important here: ctx is a talloc _parent_ */
 223         DLIST_REMOVE(conn->ctx->conn_list, conn);
 224         return 0;
 225 }
 226
 227 struct ibw_conn *ibw_conn_new(struct ibw_ctx *ctx, TALLOC_CTX *mem_ctx)
 228 {
 229         struct ibw_conn *conn;
 230         struct ibw_conn_priv *pconn;
 231
 232         assert(ctx!=NULL);
 233
 234         conn = talloc_zero(mem_ctx, struct ibw_conn);
 235         assert(conn!=NULL);
 236         talloc_set_destructor(conn, ibw_conn_destruct);
 237
 238         pconn = talloc_zero(conn, struct ibw_conn_priv);
 239         assert(pconn!=NULL);
 240         talloc_set_destructor(pconn, ibw_conn_priv_destruct);
 241
 242         conn->ctx = ctx;
 243         conn->internal = (void *)pconn;
 244
 245         DLIST_ADD(ctx->conn_list, conn);
 246
 247         return conn;
 248 }
 249
 250 static int ibw_setup_cq_qp(struct ibw_conn *conn)
 251 {
 252         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 253         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 254         struct ibv_qp_init_attr init_attr;
 255         struct ibv_qp_attr attr;
 256         int rc;
 257
 258         DEBUG(10, ("ibw_setup_cq_qp(cmid: %p)\n", pconn->cm_id));
 259
 260         /* init verbs */
 261         pconn->verbs_channel = ibv_create_comp_channel(pconn->cm_id->verbs);
 262         if (!pconn->verbs_channel) {
 263                 sprintf(ibw_lasterr, "ibv_create_comp_channel failed %d\n", errno);
 264                 return -1;
 265         }
 266         DEBUG(10, ("created channel %p\n", pconn->verbs_channel));
 267
 268         pconn->verbs_channel_event = event_add_fd(pctx->ectx, NULL, /* not pconn or conn */
 269                 pconn->verbs_channel->fd, EVENT_FD_READ, ibw_event_handler_verbs, conn);
 270
 271         pconn->pd = ibv_alloc_pd(pconn->cm_id->verbs);
 272         if (!pconn->pd) {
 273                 sprintf(ibw_lasterr, "ibv_alloc_pd failed %d\n", errno);
 274                 return -1;
 275         }
 276         DEBUG(10, ("created pd %p\n", pconn->pd));
 277
 278         /* init mr */
 279         if (ibw_init_memory(conn))
 280                 return -1;
 281
 282         /* init cq */
 283         pconn->cq = ibv_create_cq(pconn->cm_id->verbs,
 284                 pctx->opts.max_recv_wr + pctx->opts.max_send_wr,
 285                 conn, pconn->verbs_channel, 0);
 286         if (pconn->cq==NULL) {
 287                 sprintf(ibw_lasterr, "ibv_create_cq failed\n");
 288                 return -1;
 289         }
 290
 291         rc = ibv_req_notify_cq(pconn->cq, 0);
 292         if (rc) {
 293                 sprintf(ibw_lasterr, "ibv_req_notify_cq failed with %d\n", rc);
 294                 return rc;
 295         }
 296
 297         /* init qp */
 298         memset(&init_attr, 0, sizeof(init_attr));
 299         init_attr.cap.max_send_wr = pctx->opts.max_send_wr;
 300         init_attr.cap.max_recv_wr = pctx->opts.max_recv_wr;
 301         init_attr.cap.max_recv_sge = 1;
 302         init_attr.cap.max_send_sge = 1;
 303         init_attr.qp_type = IBV_QPT_RC;
 304         init_attr.send_cq = pconn->cq;
 305         init_attr.recv_cq = pconn->cq;
 306
 307         rc = rdma_create_qp(pconn->cm_id, pconn->pd, &init_attr);
 308         if (rc) {
 309                 sprintf(ibw_lasterr, "rdma_create_qp failed with %d\n", rc);
 310                 return rc;
 311         }
 312         /* elase result is in pconn->cm_id->qp */
 313
 314         rc = ibv_query_qp(pconn->cm_id->qp, &attr, IBV_QP_PATH_MTU, &init_attr);
 315         if (rc) {
 316                 sprintf(ibw_lasterr, "ibv_query_qp failed with %d\n", rc);
 317                 return rc;
 318         }
 319
 320         return ibw_fill_cq(conn);
 321 }
 322
 323 static int ibw_refill_cq_recv(struct ibw_conn *conn)
 324 {
 325         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 326         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 327         int     rc;
 328         struct ibv_sge list = {
 329                 .addr   = (uintptr_t) NULL, /* filled below */
 330                 .length = pctx->opts.recv_bufsize,
 331                 .lkey   = pconn->mr_recv->lkey /* always the same */
 332         };
 333         struct ibv_recv_wr wr = {
 334                 .wr_id      = 0, /* filled below */
 335                 .sg_list    = &list,
 336                 .num_sge    = 1,
 337         };
 338         struct ibv_recv_wr *bad_wr;
 339
 340         DEBUG(10, ("ibw_refill_cq_recv(cmid: %p)\n", pconn->cm_id));
 341
 342         list.addr = (uintptr_t) pconn->buf_recv + pctx->opts.recv_bufsize * pconn->recv_index;
 343         wr.wr_id = pconn->recv_index;
 344         pconn->recv_index = (pconn->recv_index + 1) % pctx->opts.max_recv_wr;
 345
 346         rc = ibv_post_recv(pconn->cm_id->qp, &wr, &bad_wr);
 347         if (rc) {
 348                 sprintf(ibw_lasterr, "refill/ibv_post_recv failed with %d\n", rc);
 349                 DEBUG(0, (ibw_lasterr));
 350                 return -2;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int ibw_fill_cq(struct ibw_conn *conn)
 357 {
 358         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 359         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 360         int     i, rc;
 361         struct ibv_sge list = {
 362                 .addr   = (uintptr_t) NULL, /* filled below */
 363                 .length = pctx->opts.recv_bufsize,
 364                 .lkey   = pconn->mr_recv->lkey /* always the same */
 365         };
 366         struct ibv_recv_wr wr = {
 367                 .wr_id      = 0, /* filled below */
 368                 .sg_list    = &list,
 369                 .num_sge    = 1,
 370         };
 371         struct ibv_recv_wr *bad_wr;
 372
 373         DEBUG(10, ("ibw_fill_cq(cmid: %p)\n", pconn->cm_id));
 374
 375         for(i = pctx->opts.max_recv_wr; i!=0; i--) {
 376                 list.addr = (uintptr_t) pconn->buf_recv + pctx->opts.recv_bufsize * pconn->recv_index;
 377                 wr.wr_id = pconn->recv_index;
 378                 pconn->recv_index = (pconn->recv_index + 1) % pctx->opts.max_recv_wr;
 379
 380                 rc = ibv_post_recv(pconn->cm_id->qp, &wr, &bad_wr);
 381                 if (rc) {
 382                         sprintf(ibw_lasterr, "fill/ibv_post_recv failed with %d\n", rc);
 383                         DEBUG(0, (ibw_lasterr));
 384                         return -2;
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int ibw_manage_connect(struct ibw_conn *conn)
 392 {
 393         struct rdma_conn_param conn_param;
 394         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 395         int     rc;
 396
 397         DEBUG(10, ("ibw_manage_connect(cmid: %p)\n", pconn->cm_id));
 398
 399         if (ibw_setup_cq_qp(conn))
 400                 return -1;
 401
 402         /* cm connect */
 403         memset(&conn_param, 0, sizeof conn_param);
 404         conn_param.responder_resources = 1;
 405         conn_param.initiator_depth = 1;
 406         conn_param.retry_count = 10;
 407
 408         rc = rdma_connect(pconn->cm_id, &conn_param);
 409         if (rc)
 410                 sprintf(ibw_lasterr, "rdma_connect error %d\n", rc);
 411
 412         return rc;
 413 }
 414
 415 static void ibw_event_handler_cm(struct event_context *ev,
 416         struct fd_event *fde, uint16_t flags, void *private_data)
 417 {
 418         int     rc;
 419         struct ibw_ctx  *ctx = talloc_get_type(private_data, struct ibw_ctx);
 420         struct ibw_ctx_priv *pctx = talloc_get_type(ctx->internal, struct ibw_ctx_priv);
 421         struct ibw_conn *conn = NULL;
 422         struct ibw_conn_priv *pconn = NULL;
 423         struct rdma_cm_id *cma_id = NULL;
 424         struct rdma_cm_event *event = NULL;
 425
 426         assert(ctx!=NULL);
 427
 428         rc = rdma_get_cm_event(pctx->cm_channel, &event);
 429         if (rc) {
 430                 ctx->state = IBWS_ERROR;
 431                 sprintf(ibw_lasterr, "rdma_get_cm_event error %d\n", rc);
 432                 goto error;
 433         }
 434         cma_id = event->id;
 435
 436         DEBUG(10, ("cma_event type %d cma_id %p (%s)\n", event->event, cma_id,
 437                   (cma_id == pctx->cm_id) ? "parent" : "child"));
 438
 439         switch (event->event) {
 440         case RDMA_CM_EVENT_ADDR_RESOLVED:
 441                 DEBUG(11, ("RDMA_CM_EVENT_ADDR_RESOLVED\n"));
 442                 /* continuing from ibw_connect ... */
 443                 rc = rdma_resolve_route(cma_id, 2000);
 444                 if (rc) {
 445                         sprintf(ibw_lasterr, "rdma_resolve_route error %d\n", rc);
 446                         goto error;
 447                 }
 448                 /* continued at RDMA_CM_EVENT_ROUTE_RESOLVED */
 449                 break;
 450
 451         case RDMA_CM_EVENT_ROUTE_RESOLVED:
 452                 DEBUG(11, ("RDMA_CM_EVENT_ROUTE_RESOLVED\n"));
 453                 /* after RDMA_CM_EVENT_ADDR_RESOLVED: */
 454                 assert(cma_id->context!=NULL);
 455                 conn = talloc_get_type(cma_id->context, struct ibw_conn);
 456
 457                 rc = ibw_manage_connect(conn);
 458                 if (rc)
 459                         goto error;
 460
 461                 break;
 462
 463         case RDMA_CM_EVENT_CONNECT_REQUEST:
 464                 DEBUG(11, ("RDMA_CM_EVENT_CONNECT_REQUEST\n"));
 465                 ctx->state = IBWS_CONNECT_REQUEST;
 466                 conn = ibw_conn_new(ctx, ctx);
 467                 pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 468                 pconn->cm_id = cma_id; /* !!! event will be freed but id not */
 469                 cma_id->context = (void *)conn;
 470                 DEBUG(10, ("pconn->cm_id %p\n", pconn->cm_id));
 471
 472                 if (ibw_setup_cq_qp(conn))
 473                         goto error;
 474
 475                 conn->state = IBWC_INIT;
 476                 pctx->connstate_func(ctx, conn);
 477
 478                 /* continued at ibw_accept when invoked by the func above */
 479                 if (!pconn->is_accepted) {
 480                         rc = rdma_reject(cma_id, NULL, 0);
 481                         if (rc)
 482                                 DEBUG(0, ("rdma_reject failed with rc=%d\n", rc));
 483                         talloc_free(conn);
 484                         DEBUG(10, ("pconn->cm_id %p wasn't accepted\n", pconn->cm_id));
 485                 }
 486
 487                 /* TODO: clarify whether if it's needed by upper layer: */
 488                 ctx->state = IBWS_READY;
 489                 pctx->connstate_func(ctx, NULL);
 490
 491                 /* NOTE: more requests can arrive until RDMA_CM_EVENT_ESTABLISHED ! */
 492                 break;
 493
 494         case RDMA_CM_EVENT_ESTABLISHED:
 495                 /* expected after ibw_accept and ibw_connect[not directly] */
 496                 DEBUG(0, ("ESTABLISHED (conn: %p)\n", cma_id->context));
 497                 conn = talloc_get_type(cma_id->context, struct ibw_conn);
 498                 assert(conn!=NULL); /* important assumption */
 499
 500                 DEBUG(10, ("ibw_setup_cq_qp succeeded (cmid=%p)\n", cma_id));
 501
 502                 /* client conn is up */
 503                 conn->state = IBWC_CONNECTED;
 504
 505                 /* both ctx and conn have changed */
 506                 pctx->connstate_func(ctx, conn);
 507                 break;
 508
 509         case RDMA_CM_EVENT_ADDR_ERROR:
 510                 sprintf(ibw_lasterr, "RDMA_CM_EVENT_ADDR_ERROR, error %d\n", event->status);
 511         case RDMA_CM_EVENT_ROUTE_ERROR:
 512                 sprintf(ibw_lasterr, "RDMA_CM_EVENT_ROUTE_ERROR, error %d\n", event->status);
 513         case RDMA_CM_EVENT_CONNECT_ERROR:
 514                 sprintf(ibw_lasterr, "RDMA_CM_EVENT_CONNECT_ERROR, error %d\n", event->status);
 515         case RDMA_CM_EVENT_UNREACHABLE:
 516                 sprintf(ibw_lasterr, "RDMA_CM_EVENT_UNREACHABLE, error %d\n", event->status);
 517         case RDMA_CM_EVENT_REJECTED:
 518                 sprintf(ibw_lasterr, "RDMA_CM_EVENT_REJECTED, error %d\n", event->status);
 519                 conn = talloc_get_type(cma_id->context, struct ibw_conn);
 520                 if (conn) {
 521                         if ((rc=rdma_ack_cm_event(event)))
 522                                 DEBUG(0, ("reject/rdma_ack_cm_event failed with %d\n", rc));
 523                         event = NULL;
 524                         pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 525                         ibw_conn_priv_destruct(pconn);
 526                 }
 527                 goto error;
 528
 529         case RDMA_CM_EVENT_DISCONNECTED:
 530                 DEBUG(11, ("RDMA_CM_EVENT_DISCONNECTED\n"));
 531                 if ((rc=rdma_ack_cm_event(event)))
 532                         DEBUG(0, ("disc/rdma_ack_cm_event failed with %d\n", rc));
 533                 event = NULL; /* don't ack more */
 534
 535                 if (cma_id!=pctx->cm_id) {
 536                         DEBUG(0, ("client DISCONNECT event cm_id=%p\n", cma_id));
 537                         conn = talloc_get_type(cma_id->context, struct ibw_conn);
 538                         conn->state = IBWC_DISCONNECTED;
 539                         pctx->connstate_func(NULL, conn);
 540                 }
 541                 break;
 542
 543         case RDMA_CM_EVENT_DEVICE_REMOVAL:
 544                 sprintf(ibw_lasterr, "cma detected device removal!\n");
 545                 goto error;
 546
 547         default:
 548                 sprintf(ibw_lasterr, "unknown event %d\n", event->event);
 549                 goto error;
 550         }
 551
 552         if (event!=NULL && (rc=rdma_ack_cm_event(event))) {
 553                 sprintf(ibw_lasterr, "rdma_ack_cm_event failed with %d\n", rc);
 554                 goto error;
 555         }
 556
 557         return;
 558 error:
 559         if (event!=NULL && (rc=rdma_ack_cm_event(event))) {
 560                 DEBUG(0, ("rdma_ack_cm_event failed with %d\n", rc));
 561         }
 562
 563         DEBUG(0, ("cm event handler: %s", ibw_lasterr));
 564
 565         if (cma_id!=pctx->cm_id) {
 566                 conn = talloc_get_type(cma_id->context, struct ibw_conn);
 567                 if (conn) {
 568                         conn->state = IBWC_ERROR;
 569                         pctx->connstate_func(NULL, conn);
 570                 }
 571         } else {
 572                 ctx->state = IBWS_ERROR;
 573                 pctx->connstate_func(ctx, NULL);
 574         }
 575 }
 576
 577 static void ibw_event_handler_verbs(struct event_context *ev,
 578         struct fd_event *fde, uint16_t flags, void *private_data)
 579 {
 580         struct ibw_conn *conn = talloc_get_type(private_data, struct ibw_conn);
 581         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 582         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 583
 584         struct ibv_wc wc;
 585         int rc;
 586         struct ibv_cq *ev_cq;
 587         void          *ev_ctx;
 588
 589         DEBUG(10, ("ibw_event_handler_verbs(%u)\n", (uint32_t)flags));
 590
 591         /* TODO: check whether if it's good to have more channels here... */
 592         rc = ibv_get_cq_event(pconn->verbs_channel, &ev_cq, &ev_ctx);
 593         if (rc) {
 594                 sprintf(ibw_lasterr, "Failed to get cq_event with %d\n", rc);
 595                 goto error;
 596         }
 597         if (ev_cq != pconn->cq) {
 598                 sprintf(ibw_lasterr, "ev_cq(%p) != pconn->cq(%p)\n", ev_cq, pconn->cq);
 599                 goto error;
 600         }
 601         rc = ibv_req_notify_cq(pconn->cq, 0);
 602         if (rc) {
 603                 sprintf(ibw_lasterr, "Couldn't request CQ notification (%d)\n", rc);
 604                 goto error;
 605         }
 606
 607         while((rc=ibv_poll_cq(pconn->cq, 1, &wc))==1) {
 608                 if (wc.status) {
 609                         sprintf(ibw_lasterr, "cq completion failed status=%d, opcode=%d, rc=%d\n",
 610                                 wc.status, wc.opcode, rc);
 611                         goto error;
 612                 }
 613
 614                 switch(wc.opcode) {
 615                 case IBV_WC_SEND:
 616                         DEBUG(10, ("send completion\n"));
 617                         if (ibw_wc_send(conn, &wc))
 618                                 goto error;
 619                         break;
 620
 621                 case IBV_WC_RDMA_WRITE:
 622                         DEBUG(10, ("rdma write completion\n"));
 623                         break;
 624
 625                 case IBV_WC_RDMA_READ:
 626                         DEBUG(10, ("rdma read completion\n"));
 627                         break;
 628
 629                 case IBV_WC_RECV:
 630                         DEBUG(10, ("recv completion\n"));
 631                         if (ibw_wc_recv(conn, &wc))
 632                                 goto error;
 633                         break;
 634
 635                 default:
 636                         sprintf(ibw_lasterr, "unknown completion %d\n", wc.opcode);
 637                         goto error;
 638                 }
 639         }
 640         if (rc!=0) {
 641                 sprintf(ibw_lasterr, "ibv_poll_cq error %d\n", rc);
 642                 goto error;
 643         }
 644
 645         ibv_ack_cq_events(pconn->cq, 1);
 646
 647         return;
 648 error:
 649         ibv_ack_cq_events(pconn->cq, 1);
 650
 651         DEBUG(0, (ibw_lasterr));
 652
 653         if (conn->state!=IBWC_ERROR) {
 654                 conn->state = IBWC_ERROR;
 655                 pctx->connstate_func(NULL, conn);
 656         }
 657 }
 658
 659 static int ibw_process_queue(struct ibw_conn *conn)
 660 {
 661         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 662         struct ibw_ctx_priv *pctx;
 663         struct ibw_wr   *p;
 664         int     rc;
 665         uint32_t        msg_size;
 666
 667         if (pconn->queue==NULL)
 668                 return 0; /* NOP */
 669
 670         p = pconn->queue;
 671
 672         /* we must have at least 1 fragment to send */
 673         assert(p->queued_ref_cnt>0);
 674         p->queued_ref_cnt--;
 675
 676         pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 677         msg_size = (p->queued_ref_cnt) ? pctx->opts.recv_bufsize : p->queued_rlen;
 678
 679         assert(p->queued_msg!=NULL);
 680         assert(msg_size!=0);
 681
 682         DEBUG(10, ("ibw_process_queue refcnt=%d msgsize=%u\n",
 683                 p->queued_ref_cnt, msg_size));
 684
 685         rc = ibw_send_packet(conn, p->queued_msg, p, msg_size);
 686
 687         /* was this the last fragment? */
 688         if (p->queued_ref_cnt) {
 689                 p->queued_msg += pctx->opts.recv_bufsize;
 690         } else {
 691                 DLIST_REMOVE2(pconn->queue, p, qprev, qnext);
 692                 p->queued_msg = NULL;
 693         }
 694
 695         return rc;
 696 }
 697
 698 static int ibw_wc_send(struct ibw_conn *conn, struct ibv_wc *wc)
 699 {
 700         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 701         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 702         struct ibw_wr   *p;
 703         int     send_index;
 704
 705         DEBUG(10, ("ibw_wc_send(cmid: %p, wr_id: %u, bl: %u)\n",
 706                 pconn->cm_id, (uint32_t)wc->wr_id, (uint32_t)wc->byte_len));
 707
 708         assert(pconn->cm_id->qp->qp_num==wc->qp_num);
 709         assert(wc->wr_id >= pctx->opts.max_recv_wr);
 710         send_index = wc->wr_id - pctx->opts.max_recv_wr;
 711         pconn->wr_sent--;
 712
 713         if (send_index < pctx->opts.max_send_wr) {
 714                 DEBUG(10, ("ibw_wc_send#1 %u\n", (int)wc->wr_id));
 715                 p = pconn->wr_index[send_index];
 716                 if (p->buf_large!=NULL) {
 717                         if (p->ref_cnt) {
 718                                 /* awaiting more of it... */
 719                                 p->ref_cnt--;
 720                         } else {
 721                                 ibw_free_mr(&p->buf_large, &p->mr_large);
 722                                 DLIST_REMOVE(pconn->wr_list_used, p);
 723                                 DLIST_ADD(pconn->wr_list_avail, p);
 724                         }
 725                 } else { /* nasty - but necessary */
 726                         DLIST_REMOVE(pconn->wr_list_used, p);
 727                         DLIST_ADD(pconn->wr_list_avail, p);
 728                 }
 729         } else { /* "extra" request - not optimized */
 730                 DEBUG(10, ("ibw_wc_send#2 %u\n", (int)wc->wr_id));
 731                 for(p=pconn->extra_sent; p!=NULL; p=p->next)
 732                         if ((p->wr_id + pctx->opts.max_recv_wr)==(int)wc->wr_id)
 733                                 break;
 734                 if (p==NULL) {
 735                         sprintf(ibw_lasterr, "failed to find wr_id %d\n", (int)wc->wr_id);
 736                                 return -1;
 737                 }
 738                 if (p->ref_cnt) {
 739                         p->ref_cnt--;
 740                 } else {
 741                         ibw_free_mr(&p->buf_large, &p->mr_large);
 742                         DLIST_REMOVE(pconn->extra_sent, p);
 743                         DLIST_ADD(pconn->extra_avail, p);
 744                 }
 745         }
 746
 747         return ibw_process_queue(conn);
 748 }
 749
 750 static int ibw_append_to_part(struct ibw_conn_priv *pconn,
 751         struct ibw_part *part, char **pp, uint32_t add_len, int info)
 752 {
 753         DEBUG(10, ("ibw_append_to_part: cmid=%p, (bs=%u, len=%u, tr=%u), al=%u, i=%u\n",
 754                 pconn->cm_id, part->bufsize, part->len, part->to_read, add_len, info));
 755
 756         /* allocate more if necessary - it's an "evergrowing" buffer... */
 757         if (part->len + add_len > part->bufsize) {
 758                 if (part->buf==NULL) {
 759                         assert(part->len==0);
 760                         part->buf = talloc_size(pconn, add_len);
 761                         if (part->buf==NULL) {
 762                                 sprintf(ibw_lasterr, "recv talloc_size error (%u) #%d\n",
 763                                         add_len, info);
 764                                 return -1;
 765                         }
 766                         part->bufsize = add_len;
 767                 } else {
 768                         part->buf = talloc_realloc_size(pconn,
 769                                 part->buf, part->len + add_len);
 770                         if (part->buf==NULL) {
 771                                 sprintf(ibw_lasterr, "recv realloc error (%u + %u) #%d\n",
 772                                         part->len, add_len, info);
 773                                 return -1;
 774                         }
 775                 }
 776                 part->bufsize = part->len + add_len;
 777         }
 778
 779         /* consume pp */
 780         memcpy(part->buf + part->len, *pp, add_len);
 781         *pp += add_len;
 782         part->len += add_len;
 783         part->to_read -= add_len;
 784
 785         return 0;
 786 }
 787
 788 static int ibw_wc_mem_threshold(struct ibw_conn_priv *pconn,
 789         struct ibw_part *part, uint32_t threshold)
 790 {
 791         DEBUG(10, ("ibw_wc_mem_threshold: cmid=%p, (bs=%u, len=%u, tr=%u), thr=%u\n",
 792                 pconn->cm_id, part->bufsize, part->len, part->to_read, threshold));
 793
 794         if (part->bufsize > threshold) {
 795                 DEBUG(3, ("ibw_wc_mem_threshold: cmid=%p, %u > %u\n",
 796                         pconn->cm_id, part->bufsize, threshold));
 797                 talloc_free(part->buf);
 798                 part->buf = talloc_size(pconn, threshold);
 799                 if (part->buf==NULL) {
 800                         sprintf(ibw_lasterr, "talloc_size failed\n");
 801                         return -1;
 802                 }
 803                 part->bufsize = threshold;
 804         }
 805         return 0;
 806 }
 807
 808 static int ibw_wc_recv(struct ibw_conn *conn, struct ibv_wc *wc)
 809 {
 810         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
 811         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
 812         struct ibw_part *part = &pconn->part;
 813         char    *p;
 814         uint32_t        remain = wc->byte_len;
 815
 816         DEBUG(10, ("ibw_wc_recv: cmid=%p, wr_id: %u, bl: %u\n",
 817                 pconn->cm_id, (uint32_t)wc->wr_id, remain));
 818
 819         assert(pconn->cm_id->qp->qp_num==wc->qp_num);
 820         assert((int)wc->wr_id < pctx->opts.max_recv_wr);
 821         assert(wc->byte_len <= pctx->opts.recv_bufsize);
 822
 823         p = pconn->buf_recv + ((int)wc->wr_id * pctx->opts.recv_bufsize);
 824
 825         while(remain) {
 826                 /* here always true: (part->len!=0 && part->to_read!=0) ||
 827                         (part->len==0 && part->to_read==0) */
 828                 if (part->len) { /* is there a partial msg to be continued? */
 829                         int read_len = (part->to_read<=remain) ? part->to_read : remain;
 830                         if (ibw_append_to_part(pconn, part, &p, read_len, 421))
 831                                 goto error;
 832                         remain -= read_len;
 833
 834                         if (part->len<=sizeof(uint32_t) && part->to_read==0) {
 835                                 assert(part->len==sizeof(uint32_t));
 836                                 /* set it again now... */
 837                                 part->to_read = *((uint32_t *)(part->buf)); /* TODO: ntohl */
 838                                 if (part->to_read<sizeof(uint32_t)) {
 839                                         sprintf(ibw_lasterr, "got msglen=%u #2\n", part->to_read);
 840                                         goto error;
 841                                 }
 842                                 part->to_read -= sizeof(uint32_t); /* it's already read */
 843                         }
 844
 845                         if (part->to_read==0) {
 846                                 pctx->receive_func(conn, part->buf, part->len);
 847                                 part->len = 0; /* tells not having partial data (any more) */
 848                                 if (ibw_wc_mem_threshold(pconn, part, pctx->opts.recv_threshold))
 849                                         goto error;
 850                         }
 851                 } else {
 852                         if (remain>=sizeof(uint32_t)) {
 853                                 uint32_t msglen = *(uint32_t *)p; /* TODO: ntohl */
 854                                 if (msglen<sizeof(uint32_t)) {
 855                                         sprintf(ibw_lasterr, "got msglen=%u\n", msglen);
 856                                         goto error;
 857                                 }
 858
 859                                 /* mostly awaited case: */
 860                                 if (msglen<=remain) {
 861                                         pctx->receive_func(conn, p, msglen);
 862                                         p += msglen;
 863                                         remain -= msglen;
 864                                 } else {
 865                                         part->to_read = msglen;
 866                                         /* part->len is already 0 */
 867                                         if (ibw_append_to_part(pconn, part, &p, remain, 422))
 868                                                 goto error;
 869                                         remain = 0; /* to be continued ... */
 870                                         /* part->to_read > 0 here */
 871                                 }
 872                         } else { /* edge case: */
 873                                 part->to_read = sizeof(uint32_t);
 874                                 /* part->len is already 0 */
 875                                 if (ibw_append_to_part(pconn, part, &p, remain, 423))
 876                                         goto error;
 877                                 remain = 0;
 878                                 /* part->to_read > 0 here */
 879                         }
 880                 }
 881         } /* <remain> is always decreased at least by 1 */
 882
 883         if (ibw_refill_cq_recv(conn))
 884                 goto error;
 885
 886         return 0;
 887
 888 error:
 889         DEBUG(0, ("ibw_wc_recv error: %s", ibw_lasterr));
 890         return -1;
 891 }
 892
 893 static int ibw_process_init_attrs(struct ibw_initattr *attr, int nattr, struct ibw_opts *opts)
 894 {
 895         int     i;
 896         const char *name, *value;
 897
 898         DEBUG(10, ("ibw_process_init_attrs: nattr: %d\n", nattr));
 899
 900         opts->max_send_wr = IBW_MAX_SEND_WR;
 901         opts->max_recv_wr = IBW_MAX_RECV_WR;
 902         opts->recv_bufsize = IBW_RECV_BUFSIZE;
 903         opts->recv_threshold = IBW_RECV_THRESHOLD;
 904
 905         for(i=0; i<nattr; i++) {
 906                 name = attr[i].name;
 907                 value = attr[i].value;
 908
 909                 assert(name!=NULL && value!=NULL);
 910                 if (strcmp(name, "max_send_wr")==0)
 911                         opts->max_send_wr = atoi(value);
 912                 else if (strcmp(name, "max_recv_wr")==0)
 913                         opts->max_recv_wr = atoi(value);
 914                 else if (strcmp(name, "recv_bufsize")==0)
 915                         opts->recv_bufsize = atoi(value);
 916                 else if (strcmp(name, "recv_threshold")==0)
 917                         opts->recv_threshold = atoi(value);
 918                 else {
 919                         sprintf(ibw_lasterr, "ibw_init: unknown name %s\n", name);
 920                         return -1;
 921                 }
 922         }
 923         return 0;
 924 }
 925
 926 struct ibw_ctx *ibw_init(struct ibw_initattr *attr, int nattr,
 927         void *ctx_userdata,
 928         ibw_connstate_fn_t ibw_connstate,
 929         ibw_receive_fn_t ibw_receive,
 930         struct event_context *ectx)
 931 {
 932         struct ibw_ctx *ctx = talloc_zero(NULL, struct ibw_ctx);
 933         struct ibw_ctx_priv *pctx;
 934         int     rc;
 935
 936         DEBUG(10, ("ibw_init(ctx_userdata: %p, ectx: %p)\n", ctx_userdata, ectx));
 937
 938         /* initialize basic data structures */
 939         memset(ibw_lasterr, 0, IBW_LASTERR_BUFSIZE);
 940
 941         assert(ctx!=NULL);
 942         ibw_lasterr[0] = '\0';
 943         talloc_set_destructor(ctx, ibw_ctx_destruct);
 944         ctx->ctx_userdata = ctx_userdata;
 945
 946         pctx = talloc_zero(ctx, struct ibw_ctx_priv);
 947         talloc_set_destructor(pctx, ibw_ctx_priv_destruct);
 948         ctx->internal = (void *)pctx;
 949         assert(pctx!=NULL);
 950
 951         pctx->connstate_func = ibw_connstate;
 952         pctx->receive_func = ibw_receive;
 953
 954         pctx->ectx = ectx;
 955
 956         /* process attributes */
 957         if (ibw_process_init_attrs(attr, nattr, &pctx->opts))
 958                 goto cleanup;
 959
 960         /* init cm */
 961         pctx->cm_channel = rdma_create_event_channel();
 962         if (!pctx->cm_channel) {
 963                 sprintf(ibw_lasterr, "rdma_create_event_channel error %d\n", errno);
 964                 goto cleanup;
 965         }
 966
 967         pctx->cm_channel_event = event_add_fd(pctx->ectx, pctx,
 968                 pctx->cm_channel->fd, EVENT_FD_READ, ibw_event_handler_cm, ctx);
 969
 970         rc = rdma_create_id(pctx->cm_channel, &pctx->cm_id, ctx, RDMA_PS_TCP);
 971         if (rc) {
 972                 rc = errno;
 973                 sprintf(ibw_lasterr, "rdma_create_id error %d\n", rc);
 974                 goto cleanup;
 975         }
 976         DEBUG(10, ("created cm_id %p\n", pctx->cm_id));
 977
 978         pctx->pagesize = sysconf(_SC_PAGESIZE);
 979
 980         return ctx;
 981         /* don't put code here */
 982 cleanup:
 983         DEBUG(0, (ibw_lasterr));
 984
 985         if (ctx)
 986                 talloc_free(ctx);
 987
 988         return NULL;
 989 }
 990
 991 int ibw_stop(struct ibw_ctx *ctx)
 992 {
 993         struct ibw_ctx_priv *pctx = (struct ibw_ctx_priv *)ctx->internal;
 994         struct ibw_conn *p;
 995
 996         DEBUG(10, ("ibw_stop\n"));
 997
 998         for(p=ctx->conn_list; p!=NULL; p=p->next) {
 999                 if (ctx->state==IBWC_ERROR || ctx->state==IBWC_CONNECTED) {
1000                         if (ibw_disconnect(p))
1001                                 return -1;
1002                 }
1003         }
1004
1005         ctx->state = IBWS_STOPPED;
1006         pctx->connstate_func(ctx, NULL);
1007
1008         return 0;
1009 }
1010
1011 int ibw_bind(struct ibw_ctx *ctx, struct sockaddr_in *my_addr)
1012 {
1013         struct ibw_ctx_priv *pctx = (struct ibw_ctx_priv *)ctx->internal;
1014         int     rc;
1015
1016         DEBUG(10, ("ibw_bind: addr=%s, port=%u\n",
1017                 inet_ntoa(my_addr->sin_addr), ntohs(my_addr->sin_port)));
1018         rc = rdma_bind_addr(pctx->cm_id, (struct sockaddr *) my_addr);
1019         if (rc) {
1020                 sprintf(ibw_lasterr, "rdma_bind_addr error %d\n", rc);
1021                 DEBUG(0, (ibw_lasterr));
1022                 return rc;
1023         }
1024         DEBUG(10, ("rdma_bind_addr successful\n"));
1025
1026         return 0;
1027 }
1028
1029 int ibw_listen(struct ibw_ctx *ctx, int backlog)
1030 {
1031         struct ibw_ctx_priv *pctx = talloc_get_type(ctx->internal, struct ibw_ctx_priv);
1032         int     rc;
1033
1034         DEBUG(10, ("ibw_listen\n"));
1035         rc = rdma_listen(pctx->cm_id, backlog);
1036         if (rc) {
1037                 sprintf(ibw_lasterr, "rdma_listen failed: %d\n", rc);
1038                 DEBUG(0, (ibw_lasterr));
1039                 return rc;
1040         }
1041
1042         return 0;
1043 }
1044
1045 int ibw_accept(struct ibw_ctx *ctx, struct ibw_conn *conn, void *conn_userdata)
1046 {
1047         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1048         struct rdma_conn_param  conn_param;
1049         int     rc;
1050
1051         DEBUG(10, ("ibw_accept: cmid=%p\n", pconn->cm_id));
1052         conn->conn_userdata = conn_userdata;
1053
1054         memset(&conn_param, 0, sizeof(struct rdma_conn_param));
1055         conn_param.responder_resources = 1;
1056         conn_param.initiator_depth = 1;
1057         rc = rdma_accept(pconn->cm_id, &conn_param);
1058         if (rc) {
1059                 sprintf(ibw_lasterr, "rdma_accept failed %d\n", rc);
1060                 DEBUG(0, (ibw_lasterr));
1061                 return -1;;
1062         }
1063
1064         pconn->is_accepted = 1;
1065
1066         /* continued at RDMA_CM_EVENT_ESTABLISHED */
1067
1068         return 0;
1069 }
1070
1071 int ibw_connect(struct ibw_conn *conn, struct sockaddr_in *serv_addr, void *conn_userdata)
1072 {
1073         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
1074         struct ibw_conn_priv *pconn = NULL;
1075         int     rc;
1076
1077         assert(conn!=NULL);
1078
1079         conn->conn_userdata = conn_userdata;
1080         pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1081         DEBUG(10, ("ibw_connect: addr=%s, port=%u\n", inet_ntoa(serv_addr->sin_addr),
1082                 ntohs(serv_addr->sin_port)));
1083
1084         /* clean previous - probably half - initialization */
1085         if (ibw_conn_priv_destruct(pconn)) {
1086                 DEBUG(0, ("ibw_connect/ibw_pconn_destruct failed for cm_id=%p\n", pconn->cm_id));
1087                 return -1;
1088         }
1089
1090         /* init cm */
1091         rc = rdma_create_id(pctx->cm_channel, &pconn->cm_id, conn, RDMA_PS_TCP);
1092         if (rc) {
1093                 rc = errno;
1094                 sprintf(ibw_lasterr, "ibw_connect/rdma_create_id error %d\n", rc);
1095                 talloc_free(conn);
1096                 return -1;
1097         }
1098         DEBUG(10, ("ibw_connect: rdma_create_id succeeded, cm_id=%p\n", pconn->cm_id));
1099
1100         rc = rdma_resolve_addr(pconn->cm_id, NULL, (struct sockaddr *) serv_addr, 2000);
1101         if (rc) {
1102                 sprintf(ibw_lasterr, "rdma_resolve_addr error %d\n", rc);
1103                 DEBUG(0, (ibw_lasterr));
1104                 talloc_free(conn);
1105                 return -1;
1106         }
1107
1108         /* continued at RDMA_CM_EVENT_ADDR_RESOLVED */
1109
1110         return 0;
1111 }
1112
1113 int ibw_disconnect(struct ibw_conn *conn)
1114 {
1115         int     rc;
1116         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1117
1118         DEBUG(10, ("ibw_disconnect: cmid=%p\n", pconn->cm_id));
1119
1120         assert(pconn!=NULL);
1121
1122         switch(conn->state) {
1123         case IBWC_ERROR:
1124                 ibw_conn_priv_destruct(pconn); /* do this here right now */
1125                 break;
1126         case IBWC_CONNECTED:
1127                 rc = rdma_disconnect(pconn->cm_id);
1128                 if (rc) {
1129                         sprintf(ibw_lasterr, "ibw_disconnect failed with %d\n", rc);
1130                         DEBUG(0, (ibw_lasterr));
1131                         return rc;
1132                 }
1133                 break;
1134         default:
1135                 DEBUG(9, ("invalid state for disconnect: %d\n", conn->state));
1136                 break;
1137         }
1138
1139         return 0;
1140 }
1141
1142 int ibw_alloc_send_buf(struct ibw_conn *conn, void **buf, void **key, uint32_t len)
1143 {
1144         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
1145         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1146         struct ibw_wr *p = pconn->wr_list_avail;
1147
1148         if (p!=NULL) {
1149                 DEBUG(10, ("ibw_alloc_send_buf#1: cmid=%p, len=%d\n", pconn->cm_id, len));
1150
1151                 DLIST_REMOVE(pconn->wr_list_avail, p);
1152                 DLIST_ADD(pconn->wr_list_used, p);
1153
1154                 if (len <= pctx->opts.recv_bufsize) {
1155                         *buf = (void *)p->buf;
1156                 } else {
1157                         p->buf_large = ibw_alloc_mr(pctx, pconn, len, &p->mr_large);
1158                         if (p->buf_large==NULL) {
1159                                 sprintf(ibw_lasterr, "ibw_alloc_mr#1 failed\n");
1160                                 goto error;
1161                         }
1162                         *buf = (void *)p->buf_large;
1163                 }
1164                 /* p->wr_id is already filled in ibw_init_memory */
1165         } else {
1166                 DEBUG(10, ("ibw_alloc_send_buf#2: cmid=%p, len=%d\n", pconn->cm_id, len));
1167                 /* not optimized */
1168                 p = pconn->extra_avail;
1169                 if (!p) {
1170                         p = pconn->extra_avail = talloc_zero(pconn, struct ibw_wr);
1171                         talloc_set_destructor(p, ibw_wr_destruct);
1172                         if (p==NULL) {
1173                                 sprintf(ibw_lasterr, "talloc_zero failed (emax: %u)\n", pconn->extra_max);
1174                                 goto error;
1175                         }
1176                         p->wr_id = pctx->opts.max_send_wr + pconn->extra_max;
1177                         pconn->extra_max++;
1178                         switch(pconn->extra_max) {
1179                                 case 1: DEBUG(2, ("warning: queue performed\n")); break;
1180                                 case 10: DEBUG(0, ("warning: queue reached 10\n")); break;
1181                                 case 100: DEBUG(0, ("warning: queue reached 100\n")); break;
1182                                 case 1000: DEBUG(0, ("warning: queue reached 1000\n")); break;
1183                                 default: break;
1184                         }
1185                 }
1186
1187                 p->buf_large = ibw_alloc_mr(pctx, pconn, len, &p->mr_large);
1188                 if (p->buf_large==NULL) {
1189                         sprintf(ibw_lasterr, "ibw_alloc_mr#2 failed\n");
1190                         goto error;
1191                 }
1192                 *buf = (void *)p->buf_large;
1193
1194                 DLIST_REMOVE(pconn->extra_avail, p);
1195                 /* we don't have prepared index for this, so that
1196                  * we will have to find this by wr_id later on */
1197                 DLIST_ADD(pconn->extra_sent, p);
1198         }
1199
1200         *key = (void *)p;
1201
1202         return 0;
1203 error:
1204         DEBUG(0, ("ibw_alloc_send_buf error: %s", ibw_lasterr));
1205         return -1;
1206 }
1207
1208
1209 static int ibw_send_packet(struct ibw_conn *conn, void *buf, struct ibw_wr *p, uint32_t len)
1210 {
1211         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
1212         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1213         int     rc;
1214
1215         /* can we send it right now? */
1216         if (pconn->wr_sent<pctx->opts.max_send_wr) {
1217                 struct ibv_send_wr *bad_wr;
1218                 struct ibv_sge list = {
1219                         .addr   = (uintptr_t)buf,
1220                         .length = len,
1221                         .lkey   = pconn->mr_send->lkey
1222                 };
1223                 struct ibv_send_wr wr = {
1224                         .wr_id      = p->wr_id + pctx->opts.max_recv_wr,
1225                         .sg_list    = &list,
1226                         .num_sge    = 1,
1227                         .opcode     = IBV_WR_SEND,
1228                         .send_flags = IBV_SEND_SIGNALED,
1229                 };
1230
1231                 if (p->buf_large==NULL) {
1232                         DEBUG(10, ("ibw_send#normal(cmid: %p, wrid: %u, n: %d)\n",
1233                                 pconn->cm_id, (uint32_t)wr.wr_id, len));
1234                 } else {
1235                         DEBUG(10, ("ibw_send#large(cmid: %p, wrid: %u, n: %d)\n",
1236                                 pconn->cm_id, (uint32_t)wr.wr_id, len));
1237                         list.lkey = p->mr_large->lkey;
1238                 }
1239
1240                 rc = ibv_post_send(pconn->cm_id->qp, &wr, &bad_wr);
1241                 if (rc) {
1242                         sprintf(ibw_lasterr, "ibv_post_send error %d (%d)\n",
1243                                 rc, pconn->wr_sent);
1244                         goto error;
1245                 }
1246
1247                 pconn->wr_sent++;
1248
1249                 return rc;
1250         } /* else put the request into our own queue: */
1251
1252         DEBUG(10, ("ibw_send#queued(cmid: %p, len: %u)\n", pconn->cm_id, len));
1253
1254         /* TODO: clarify how to continue when state==IBWC_STOPPED */
1255
1256         /* to be sent by ibw_wc_send */
1257         /* regardless "normal" or [a part of] "large" packet */
1258         if (!p->queued_ref_cnt) {
1259                 DLIST_ADD_END2(pconn->queue, p, struct ibw_wr *,
1260                         qprev, qnext); /* TODO: optimize */
1261                 p->queued_msg = buf;
1262         }
1263         p->queued_ref_cnt++;
1264         p->queued_rlen = len; /* last wins; see ibw_wc_send */
1265
1266         return 0;
1267 error:
1268         DEBUG(0, (ibw_lasterr));
1269         return -1;
1270 }
1271
1272 int ibw_send(struct ibw_conn *conn, void *buf, void *key, uint32_t len)
1273 {
1274         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
1275         struct ibw_wr *p = talloc_get_type(key, struct ibw_wr);
1276         int     rc;
1277
1278         assert(len>=sizeof(uint32_t));
1279         assert((*((uint32_t *)buf)==len)); /* TODO: htonl */
1280
1281         if (len > pctx->opts.recv_bufsize) {
1282                 struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1283                 int     rlen = len;
1284                 char    *packet = (char *)buf;
1285                 uint32_t        recv_bufsize = pctx->opts.recv_bufsize;
1286
1287                 DEBUG(10, ("ibw_send#frag(cmid: %p, buf: %p, len: %u)\n",
1288                         pconn->cm_id, buf, len));
1289
1290                 /* single threaded => no race here: */
1291                 assert(p->ref_cnt==0);
1292                 while(rlen > recv_bufsize) {
1293                         rc = ibw_send_packet(conn, packet, p, recv_bufsize);
1294                         if (rc)
1295                                 return rc;
1296                         packet += recv_bufsize;
1297                         rlen -= recv_bufsize;
1298                         p->ref_cnt++; /* not good to have it in ibw_send_packet */
1299                 }
1300                 if (rlen) {
1301                         rc = ibw_send_packet(conn, packet, p, rlen);
1302                         p->ref_cnt++; /* not good to have it in ibw_send_packet */
1303                 }
1304                 p->ref_cnt--; /* for the same handling */
1305         } else {
1306                 assert(p->ref_cnt==0);
1307                 assert(p->queued_ref_cnt==0);
1308
1309                 rc = ibw_send_packet(conn, buf, p, len);
1310         }
1311         return rc;
1312 }
1313
1314 int ibw_cancel_send_buf(struct ibw_conn *conn, void *buf, void *key)
1315 {
1316         struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
1317         struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
1318         struct ibw_wr *p = talloc_get_type(key, struct ibw_wr);
1319
1320         assert(p!=NULL);
1321         assert(buf!=NULL);
1322         assert(conn!=NULL);
1323
1324         if (p->buf_large!=NULL)
1325                 ibw_free_mr(&p->buf_large, &p->mr_large);
1326
1327         /* parallel case */
1328         if (p->wr_id < pctx->opts.max_send_wr) {
1329                 DEBUG(10, ("ibw_cancel_send_buf#1 %u", (int)p->wr_id));
1330                 DLIST_REMOVE(pconn->wr_list_used, p);
1331                 DLIST_ADD(pconn->wr_list_avail, p);
1332         } else { /* "extra" packet */
1333                 DEBUG(10, ("ibw_cancel_send_buf#2 %u", (int)p->wr_id));
1334                 DLIST_REMOVE(pconn->extra_sent, p);
1335                 DLIST_ADD(pconn->extra_avail, p);
1336         }
1337
1338         return 0;
1339 }
1340
1341 const char *ibw_getLastError(void)
1342 {
1343         return ibw_lasterr;
1344 }