lnet/klnds/gnilnd/gnilnd_modparams.c

   1 /*
   2  * Copyright (C) 2004 Cluster File Systems, Inc.
   3  *
   4  * Copyright (C) 2009-2012 Cray, Inc.
   5  *
   6  *   Derived from work by: Eric Barton <eric@bartonsoftware.com>
   7  *   Author: Nic Henke <nic@cray.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  */
  25
  26 #include "gnilnd.h"
  27
  28 static int credits = 256;
  29 CFS_MODULE_PARM(credits, "i", int, 0444,
  30                 "# concurrent sends");
  31
  32 static int eager_credits = 256 * 1024;
  33 CFS_MODULE_PARM(eager_credits, "i", int, 0444,
  34                 "# eager buffers");
  35
  36 static int peer_credits = 16;
  37 CFS_MODULE_PARM(peer_credits, "i", int, 0444,
  38                 "# LNet peer credits");
  39
  40 /* NB - we'll not actually limit sends to this, we just size the mailbox buffer
  41  * such that at most we'll have concurrent_sends * max_immediate messages
  42  * in the mailbox */
  43 static int concurrent_sends = 0;
  44 CFS_MODULE_PARM(concurrent_sends, "i", int, 0444,
  45                 "# concurrent HW sends to 1 peer");
  46
  47 /* default for 2k nodes @ 16 peer credits */
  48 static int fma_cq_size = 32768;
  49 CFS_MODULE_PARM(fma_cq_size, "i", int, 0444,
  50                 "size of the completion queue");
  51
  52 static int timeout = GNILND_BASE_TIMEOUT;
  53 /* can't change @ runtime because LNet gets NI data at startup from
  54  * this value */
  55 CFS_MODULE_PARM(timeout, "i", int, 0444,
  56                 "communications timeout (seconds)");
  57
  58 /* time to wait between datagram timeout and sending of next dgram */
  59 static int min_reconnect_interval = GNILND_MIN_RECONNECT_TO;
  60 CFS_MODULE_PARM(min_reconnect_interval, "i", int, 0644,
  61                 "minimum connection retry interval (seconds)");
  62
  63 /* if this goes longer than timeout, we'll timeout the TX before
  64  * the dgram */
  65 static int max_reconnect_interval = GNILND_MAX_RECONNECT_TO;
  66 CFS_MODULE_PARM(max_reconnect_interval, "i", int, 0644,
  67                 "maximum connection retry interval (seconds)");
  68
  69 static int max_immediate = 8192;
  70 CFS_MODULE_PARM(max_immediate, "i", int, 0644,
  71                 "immediate/RDMA breakpoint");
  72
  73 static int checksum = GNILND_CHECKSUM_DEFAULT;
  74 CFS_MODULE_PARM(checksum, "i", int, 0644,
  75                 "0: None, 1: headers, 2: short msg, 3: all traffic");
  76
  77 static int checksum_dump = 0;
  78 CFS_MODULE_PARM(checksum_dump, "i", int, 0644,
  79                 "0: None, 1: dump log on failure, 2: payload data to D_INFO log");
  80
  81 static int bte_dlvr_mode = GNILND_RDMA_DLVR_OPTION;
  82 CFS_MODULE_PARM(bte_dlvr_mode, "i", int, 0644,
  83                 "enable hashing for BTE (RDMA) transfers");
  84
  85 static int bte_relaxed_ordering = 1;
  86 CFS_MODULE_PARM(bte_relaxed_ordering, "i", int, 0644,
  87                 "enable relaxed ordering (PASSPW) for BTE (RDMA) transfers");
  88
  89 #ifdef CONFIG_MK1OM
  90 static int ptag = GNI_PTAG_LND_KNC;
  91 #else
  92 static int ptag = GNI_PTAG_LND;
  93 #endif
  94 CFS_MODULE_PARM(ptag, "i", int, 0444,
  95                 "ptag for Gemini CDM");
  96
  97 static int pkey = GNI_JOB_CREATE_COOKIE(GNI_PKEY_LND, 0);
  98 CFS_MODULE_PARM(pkey, "i", int, 0444, "pkey for CDM");
  99
 100 static int max_retransmits = 1024;
 101 CFS_MODULE_PARM(max_retransmits, "i", int, 0444,
 102                 "max retransmits for FMA");
 103
 104 static int nwildcard = 4;
 105 CFS_MODULE_PARM(nwildcard, "i", int, 0444,
 106                 "# wildcard datagrams to post per net (interface)");
 107
 108 static int nice = -20;
 109 CFS_MODULE_PARM(nice, "i", int, 0444,
 110                 "nice value for kgnilnd threads, default -20");
 111
 112 static int rdmaq_intervals = 4;
 113 CFS_MODULE_PARM(rdmaq_intervals, "i", int, 0644,
 114                 "# intervals per second for rdmaq throttling, default 4, 0 to disable");
 115
 116 static int loops = 100;
 117 CFS_MODULE_PARM(loops, "i", int, 0644,
 118                 "# of loops before scheduler is friendly, default 100");
 119
 120 static int hash_size = 503;
 121 CFS_MODULE_PARM(hash_size, "i", int, 0444,
 122                 "prime number for peer/conn hash sizing, default 503");
 123
 124 static int peer_health = 0;
 125 CFS_MODULE_PARM(peer_health, "i", int, 0444,
 126                 "Disable peer timeout for LNet peer health, default off, > 0 to enable");
 127
 128 static int peer_timeout = -1;
 129 CFS_MODULE_PARM(peer_timeout, "i", int, 0444,
 130                 "Peer timeout used for peer_health, default based on gnilnd timeout, > -1 to manually set");
 131
 132 static int vmap_cksum = 0;
 133 CFS_MODULE_PARM(vmap_cksum, "i", int, 0644,
 134                 "use vmap for all kiov checksumming, default off");
 135
 136 static int mbox_per_block = GNILND_FMABLK;
 137 CFS_MODULE_PARM(mbox_per_block, "i", int, 0644,
 138                 "mailboxes per block");
 139
 140 static int nphys_mbox = 0;
 141 CFS_MODULE_PARM(nphys_mbox, "i", int, 0444,
 142                 "# mbox to preallocate from physical memory, default 0");
 143
 144 static int mbox_credits = GNILND_MBOX_CREDITS;
 145 CFS_MODULE_PARM(mbox_credits, "i", int, 0644,
 146                 "number of credits per mailbox");
 147
 148 static int sched_threads = GNILND_SCHED_THREADS;
 149 CFS_MODULE_PARM(sched_threads, "i", int, 0444,
 150                 "number of threads for moving data");
 151
 152 static int net_hash_size = 11;
 153 CFS_MODULE_PARM(net_hash_size, "i", int, 0444,
 154                 "prime number for net hash sizing, default 11");
 155
 156 static int hardware_timeout = GNILND_HARDWARE_TIMEOUT;
 157 CFS_MODULE_PARM(hardware_timeout, "i", int, 0444,
 158                 "maximum time for traffic to get from one node to another");
 159
 160 static int mdd_timeout = GNILND_MDD_TIMEOUT;
 161 CFS_MODULE_PARM(mdd_timeout, "i", int, 0644,
 162                 "maximum time (in minutes) for mdd to be held");
 163
 164 static int sched_timeout = GNILND_SCHED_TIMEOUT;
 165 CFS_MODULE_PARM(sched_timeout, "i", int, 0644,
 166                 "scheduler aliveness in seconds max time");
 167
 168 static int sched_nice = GNILND_SCHED_NICE;
 169 CFS_MODULE_PARM(sched_nice, "i", int, 0444,
 170                 "scheduler's nice setting, default compute 0 service -20");
 171
 172 static int reverse_rdma = GNILND_REVERSE_RDMA;
 173 CFS_MODULE_PARM(reverse_rdma, "i", int, 0644,
 174                 "Normal 0: Reverse GET: 1 Reverse Put: 2 Reverse Both: 3");
 175
 176 static int dgram_timeout = GNILND_DGRAM_TIMEOUT;
 177 CFS_MODULE_PARM(dgram_timeout, "i", int, 0644,
 178                 "dgram thread aliveness seconds max time");
 179
 180 static int efault_lbug = 0;
 181 CFS_MODULE_PARM(efault_lbug, "i", int, 0644,
 182                 "If a compute receives an EFAULT in"
 183                 " a message should it LBUG. 0 off 1 on");
 184
 185 static int fast_reconn = GNILND_FAST_RECONNECT;
 186 CFS_MODULE_PARM(fast_reconn, "i", int, 0644,
 187                 "fast reconnect on connection timeout");
 188
 189 static int max_conn_purg = GNILND_PURGATORY_MAX;
 190 CFS_MODULE_PARM(max_conn_purg, "i", int, 0644,
 191                 "Max number of connections per peer in purgatory");
 192
 193 static int thread_affinity = 0;
 194 CFS_MODULE_PARM(thread_affinity, "i", int, 0444,
 195                 "scheduler thread affinity default 0 (diabled)");
 196
 197 kgn_tunables_t kgnilnd_tunables = {
 198         .kgn_min_reconnect_interval = &min_reconnect_interval,
 199         .kgn_max_reconnect_interval = &max_reconnect_interval,
 200         .kgn_credits                = &credits,
 201         .kgn_peer_credits           = &peer_credits,
 202         .kgn_concurrent_sends       = &concurrent_sends,
 203         .kgn_fma_cq_size            = &fma_cq_size,
 204         .kgn_timeout                = &timeout,
 205         .kgn_max_immediate          = &max_immediate,
 206         .kgn_checksum               = &checksum,
 207         .kgn_checksum_dump          = &checksum_dump,
 208         .kgn_bte_dlvr_mode          = &bte_dlvr_mode,
 209         .kgn_bte_relaxed_ordering   = &bte_relaxed_ordering,
 210         .kgn_ptag                   = &ptag,
 211         .kgn_pkey                   = &pkey,
 212         .kgn_max_retransmits        = &max_retransmits,
 213         .kgn_nwildcard              = &nwildcard,
 214         .kgn_nice                   = &nice,
 215         .kgn_rdmaq_intervals        = &rdmaq_intervals,
 216         .kgn_loops                  = &loops,
 217         .kgn_peer_hash_size         = &hash_size,
 218         .kgn_peer_health            = &peer_health,
 219         .kgn_peer_timeout           = &peer_timeout,
 220         .kgn_vmap_cksum             = &vmap_cksum,
 221         .kgn_mbox_per_block         = &mbox_per_block,
 222         .kgn_nphys_mbox             = &nphys_mbox,
 223         .kgn_mbox_credits           = &mbox_credits,
 224         .kgn_sched_threads          = &sched_threads,
 225         .kgn_net_hash_size          = &net_hash_size,
 226         .kgn_hardware_timeout       = &hardware_timeout,
 227         .kgn_mdd_timeout            = &mdd_timeout,
 228         .kgn_sched_timeout          = &sched_timeout,
 229         .kgn_sched_nice             = &sched_nice,
 230         .kgn_reverse_rdma           = &reverse_rdma,
 231         .kgn_dgram_timeout          = &dgram_timeout,
 232         .kgn_eager_credits          = &eager_credits,
 233         .kgn_fast_reconn            = &fast_reconn,
 234         .kgn_efault_lbug            = &efault_lbug,
 235         .kgn_thread_affinity        = &thread_affinity,
 236         .kgn_max_purgatory          = &max_conn_purg
 237 };
 238
 239 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 240 static struct ctl_table kgnilnd_ctl_table[] = {
 241         {
 242                 INIT_CTL_NAME
 243                 .procname = "min_reconnect_interval",
 244                 .data     = &min_reconnect_interval,
 245                 .maxlen   = sizeof(int),
 246                 .mode     = 0644,
 247                 .proc_handler = &proc_dointvec
 248         },
 249         {
 250                 INIT_CTL_NAME
 251                 .procname = "max_reconnect_interval",
 252                 .data     = &max_reconnect_interval,
 253                 .maxlen   = sizeof(int),
 254                 .mode     = 0644,
 255                 .proc_handler = &proc_dointvec
 256         },
 257         {
 258                 INIT_CTL_NAME
 259                 .procname = "credits",
 260                 .data     = &credits,
 261                 .maxlen   = sizeof(int),
 262                 .mode     = 0444,
 263                 .proc_handler = &proc_dointvec
 264         },
 265         {
 266                 INIT_CTL_NAME
 267                 .procname = "peer_credits",
 268                 .data     = &peer_credits,
 269                 .maxlen   = sizeof(int),
 270                 .mode     = 0444,
 271                 .proc_handler = &proc_dointvec
 272         },
 273         {
 274                 INIT_CTL_NAME
 275                 .procname = "fma_cq_size",
 276                 .data     = &fma_cq_size,
 277                 .maxlen   = sizeof(int),
 278                 .mode     = 0444,
 279                 .proc_handler = &proc_dointvec
 280         },
 281         {
 282                 INIT_CTL_NAME
 283                 .procname = "timeout",
 284                 .data     = &timeout,
 285                 .maxlen   = sizeof(int),
 286                 .mode     = 0444,
 287                 .proc_handler = &proc_dointvec
 288         },
 289         {
 290                 INIT_CTL_NAME
 291                 .procname = "max_immediate",
 292                 .data     = &max_immediate,
 293                 .maxlen   = sizeof(int),
 294                 .mode     = 0444,
 295                 .proc_handler = &proc_dointvec
 296         },
 297         {
 298                 INIT_CTL_NAME
 299                 .procname = "checksum",
 300                 .data     = &checksum,
 301                 .maxlen   = sizeof(int),
 302                 .mode     = 0644,
 303                 .proc_handler = &proc_dointvec
 304         },
 305         {
 306                 INIT_CTL_NAME
 307                 .procname = "bte_dlvr_mode",
 308                 .data     = &bte_dlvr_mode,
 309                 .maxlen   = sizeof(int),
 310                 .mode     = 0644,
 311                 .proc_handler = &proc_dointvec
 312         },
 313         {
 314                 INIT_CTL_NAME
 315                 .procname = "ptag",
 316                 .data     = &ptag,
 317                 .maxlen   = sizeof(int),
 318                 .mode     = 0444,
 319                 .proc_handler = &proc_dointvec
 320         },
 321         {
 322                 INIT_CTL_NAME
 323                 .procname = "pkey",
 324                 .data     = &pkey,
 325                 .maxlen   = sizeof(int),
 326                 .mode     = 0444,
 327                 .proc_handler = &proc_dointvec
 328         },
 329         {
 330                 INIT_CTL_NAME
 331                 .procname = "nwildcard",
 332                 .data     = &nwildcard,
 333                 .maxlen   = sizeof(int),
 334                 .mode     = 0444,
 335                 .proc_handler = &proc_dointvec
 336         },
 337         {
 338                 INIT_CTL_NAME
 339                 .procname = "bte_relaxed_ordering",
 340                 .data     = &bte_relaxed_ordering,
 341                 .maxlen   = sizeof(int),
 342                 .mode     = 0644,
 343                 .proc_handler = &proc_dointvec
 344         },
 345         {
 346                 INIT_CTL_NAME
 347                 .procname = "checksum_dump",
 348                 .data     = &checksum_dump,
 349                 .maxlen   = sizeof(int),
 350                 .mode     = 0644,
 351                 .proc_handler = &proc_dointvec
 352         },
 353         {
 354                 INIT_CTL_NAME
 355                 .procname = "nice",
 356                 .data     = &nice,
 357                 .maxlen   = sizeof(int),
 358                 .mode     = 0444,
 359                 .proc_handler = &proc_dointvec
 360         },
 361         {
 362                 INIT_CTL_NAME
 363                 .procname = "rdmaq_intervals",
 364                 .data     = &rdmaq_intervals,
 365                 .maxlen   = sizeof(int),
 366                 .mode     = 0644,
 367                 .proc_handler = &proc_dointvec
 368         },
 369         {
 370                 INIT_CTL_NAME
 371                 .procname = "loops",
 372                 .data     = &loops,
 373                 .maxlen   = sizeof(int),
 374                 .mode     = 0644,
 375                 .proc_handler = &proc_dointvec
 376         },
 377         {
 378                 INIT_CTL_NAME
 379                 .procname = "hash_size",
 380                 .data     = &hash_size,
 381                 .maxlen   = sizeof(int),
 382                 .mode     = 0444,
 383                 .proc_handler = &proc_dointvec
 384         },
 385         {
 386                 INIT_CTL_NAME
 387                 .procname = "peer_health",
 388                 .data     = &peer_health,
 389                 .maxlen   = sizeof(int),
 390                 .mode     = 0444,
 391                 .proc_handler = &proc_dointvec
 392         },
 393         {
 394                 INIT_CTL_NAME
 395                 .procname = "vmap_cksum",
 396                 .data     = &vmap_cksum,
 397                 .maxlen   = sizeof(int),
 398                 .mode     = 0644,
 399                 .proc_handler = &proc_dointvec
 400         },
 401         {
 402                 INIT_CTL_NAME
 403                 .procname = "mbox_per_block",
 404                 .data     = &mbox_per_block,
 405                 .maxlen   = sizeof(int),
 406                 .mode     = 0644,
 407                 .proc_handler = &proc_dointvec
 408         },
 409         {
 410                 INIT_CTL_NAME
 411                 .procname = "mbox_credits"
 412                 .data     = &mbox_credits,
 413                 .maxlen   = sizeof(int),
 414                 .mode     = 0644,
 415                 .proc_handler = &proc_dointvec
 416         },
 417         {
 418                 INIT_CTL_NAME
 419                 .procname = "sched_threads"
 420                 .data     = &sched_threads,
 421                 .maxlen   = sizeof(int),
 422                 .mode     = 0444,
 423                 .proc_handler = &proc_dointvec
 424         },
 425         {
 426                 INIT_CTL_NAME
 427                 .procname = "net_hash_size",
 428                 .data     = &net_hash_size,
 429                 .maxlen   = sizeof(int),
 430                 .mode     = 0444,
 431                 .proc_handler = &proc_dointvec
 432         },
 433         {
 434                 INIT_CTL_NAME
 435                 .procname = "hardware_timeout",
 436                 .data     = &hardware_timeout,
 437                 .maxlen   = sizeof(int),
 438                 .mode     = 0444,
 439                 .proc_handler = &proc_dointvec
 440         },
 441         {
 442                 INIT_CTL_NAME
 443                 .procname = "mdd_timeout",
 444                 .data     = &mdd_timeout,
 445                 .maxlen   = sizeof(int),
 446                 .mode     = 0644,
 447                 .proc_handler = &proc_dointvec
 448         },
 449         {
 450                 INIT_CTL_NAME
 451                 .procname = "max_retransmits"
 452                 .data     = &max_retransmits,
 453                 .maxlen   = sizeof(int),
 454                 .mode     = 0444,
 455                 .proc_handler = &proc_dointvec
 456         },
 457         {
 458                 INIT_CTL_NAME
 459                 .procname = "concurrent_sends",
 460                 .data     = &concurrent_sends,
 461                 .maxlen   = sizeof(int),
 462                 .mode     = 0444,
 463                 .proc_handler = &proc_dointvec
 464         },
 465         {
 466                 INIT_CTL_NAME
 467                 .procname = "nphys_mbox",
 468                 .data     = &nphys_mbox,
 469                 .maxlen   = sizeof(int),
 470                 .mode     = 0444,
 471                 .proc_handler = &proc_dointvec
 472         },
 473         {
 474                 INIT_CTL_NAME
 475                 .procname = "sched_timeout",
 476                 .data     = &sched_timeout,
 477                 .maxlen   = sizeof(int),
 478                 .mode     = 0644,
 479                 .proc_handler = &proc_dointvec
 480         },
 481         {
 482                 INIT_CTL_NAME
 483                 .procname = "sched_nice",
 484                 .data     = &sched_nice,
 485                 .maxlen   = sizeof(int),
 486                 .mode     = 0444,
 487                 .proc_handler = &proc_dointvec
 488         },
 489         {
 490                 INIT_CTL_NAME
 491                 .procname = "reverse_rdma",
 492                 .data     = &reverse_rdma,
 493                 .maxlen   = sizeof(int),
 494                 .mode     = 0644,
 495                 .proc_handler = &proc_dointvec
 496         },
 497                 INIT_CTL_NAME
 498                 .procname = "dgram_timeout"
 499                 .data     = &dgram_timeout,
 500                 .maxlen   = sizeof(int),
 501                 .mode     = 0644,
 502                 .proc_handler = &proc_dointvec
 503         },
 504         {
 505                 INIT_CTL_NAME
 506                 .procname = "peer_timeout"
 507                 .data     = &peer_timeout,
 508                 .maxlen   = sizeof(int),
 509                 .mode     = 0444,
 510                 .proc_handler = &proc_dointvec
 511         },
 512         {
 513                 INIT_CTL_NAME
 514                 .procname = "eager_credits",
 515                 .data     = &eager_credits,
 516                 .maxlen   = sizeof(int),
 517                 .mode     = 0644,
 518                 .proc_handler = &proc_dointvec
 519         },
 520         {
 521                 INIT_CTL_NAME
 522                 .procname = "efault_lbug"
 523                 .data     = &efault_lbug,
 524                 .maxlen   = sizeof(int),
 525                 .mode     = 0644,
 526                 .proc_handler = &proc_dointvec
 527         },
 528         {
 529                 INIT_CTL_NAME
 530                 .procname = "thread_affinity"
 531                 .data     = &thread_affinity,
 532                 .maxlen   = sizeof(int),
 533                 .mode     = 0444,
 534                 .proc_handler = &proc_dointvec
 535         },
 536         {
 537                 INIT_CTL_NAME
 538                 .procname = "max_conn_purg"
 539                 .data     = &max_conn_purg,
 540                 .maxlen   = sizeof(int),
 541                 .mode     = 0644,
 542                 .proc_handler = &proc_dointvec
 543         },
 544         { 0 }
 545 };
 546
 547 static struct ctl_table kgnilnd_top_ctl_table[] = {
 548         {
 549                 INIT_CTL_NAME
 550                 .procname = "gnilnd",
 551                 .data     = NULL,
 552                 .maxlen   = 0,
 553                 .mode     = 0555,
 554                 .child    = kgnilnd_ctl_table
 555         },
 556         { 0 }
 557 };
 558 #endif
 559
 560 int
 561 kgnilnd_tunables_init()
 562 {
 563         int rc = 0;
 564
 565 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 566         kgnilnd_tunables.kgn_sysctl =
 567                 cfs_register_sysctl_table(kgnilnd_top_ctl_table, 0);
 568
 569         if (kgnilnd_tunables.kgn_sysctl == NULL)
 570                 CWARN("Can't setup /proc tunables\n");
 571 #endif
 572         switch (*kgnilnd_tunables.kgn_checksum) {
 573         default:
 574                 CERROR("Invalid checksum module parameter: %d\n",
 575                        *kgnilnd_tunables.kgn_checksum);
 576                 rc = -EINVAL;
 577                 GOTO(out, rc);
 578         case GNILND_CHECKSUM_OFF:
 579                 /* no checksumming */
 580                 break;
 581         case GNILND_CHECKSUM_SMSG_HEADER:
 582                 LCONSOLE_INFO("SMSG header only checksumming enabled\n");
 583                 break;
 584         case GNILND_CHECKSUM_SMSG:
 585                 LCONSOLE_INFO("SMSG checksumming enabled\n");
 586                 break;
 587         case GNILND_CHECKSUM_SMSG_BTE:
 588                 LCONSOLE_INFO("SMSG + BTE checksumming enabled\n");
 589                 break;
 590         }
 591
 592         if (*kgnilnd_tunables.kgn_max_immediate > GNILND_MAX_IMMEDIATE) {
 593                 LCONSOLE_ERROR("kgnilnd module parameter 'max_immediate' too large %d > %d\n",
 594                 *kgnilnd_tunables.kgn_max_immediate, GNILND_MAX_IMMEDIATE);
 595                 rc = -EINVAL;
 596                 GOTO(out, rc);
 597         }
 598
 599         if (*kgnilnd_tunables.kgn_mbox_per_block < 1) {
 600                 *kgnilnd_tunables.kgn_mbox_per_block = 1;
 601         }
 602
 603         if (*kgnilnd_tunables.kgn_concurrent_sends == 0) {
 604                 *kgnilnd_tunables.kgn_concurrent_sends = *kgnilnd_tunables.kgn_peer_credits;
 605         } else if (*kgnilnd_tunables.kgn_concurrent_sends > *kgnilnd_tunables.kgn_peer_credits) {
 606                 LCONSOLE_ERROR("kgnilnd parameter 'concurrent_sends' too large: %d > %d (peer_credits)\n",
 607                                *kgnilnd_tunables.kgn_concurrent_sends, *kgnilnd_tunables.kgn_peer_credits);
 608                 rc = -EINVAL;
 609         }
 610 out:
 611         return rc;
 612 }
 613
 614 void
 615 kgnilnd_tunables_fini()
 616 {
 617 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 618         if (kgnilnd_tunables.kgn_sysctl != NULL)
 619                 cfs_unregister_sysctl_table(kgnilnd_tunables.kgn_sysctl);
 620 #endif
 621 }