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 max_retransmits = 1024;
  98 CFS_MODULE_PARM(max_retransmits, "i", int, 0444,
  99                 "max retransmits for FMA");
 100
 101 static int nwildcard = 4;
 102 CFS_MODULE_PARM(nwildcard, "i", int, 0444,
 103                 "# wildcard datagrams to post per net (interface)");
 104
 105 static int nice = -20;
 106 CFS_MODULE_PARM(nice, "i", int, 0444,
 107                 "nice value for kgnilnd threads, default -20");
 108
 109 static int rdmaq_intervals = 4;
 110 CFS_MODULE_PARM(rdmaq_intervals, "i", int, 0644,
 111                 "# intervals per second for rdmaq throttling, default 4, 0 to disable");
 112
 113 static int loops = 100;
 114 CFS_MODULE_PARM(loops, "i", int, 0644,
 115                 "# of loops before scheduler is friendly, default 100");
 116
 117 static int hash_size = 503;
 118 CFS_MODULE_PARM(hash_size, "i", int, 0444,
 119                 "prime number for peer/conn hash sizing, default 503");
 120
 121 static int peer_health = 0;
 122 CFS_MODULE_PARM(peer_health, "i", int, 0444,
 123                 "Disable peer timeout for LNet peer health, default off, > 0 to enable");
 124
 125 static int peer_timeout = -1;
 126 CFS_MODULE_PARM(peer_timeout, "i", int, 0444,
 127                 "Peer timeout used for peer_health, default based on gnilnd timeout, > -1 to manually set");
 128
 129 static int vmap_cksum = 0;
 130 CFS_MODULE_PARM(vmap_cksum, "i", int, 0644,
 131                 "use vmap for all kiov checksumming, default off");
 132
 133 static int mbox_per_block = GNILND_FMABLK;
 134 CFS_MODULE_PARM(mbox_per_block, "i", int, 0644,
 135                 "mailboxes per block");
 136
 137 static int nphys_mbox = 0;
 138 CFS_MODULE_PARM(nphys_mbox, "i", int, 0444,
 139                 "# mbox to preallocate from physical memory, default 0");
 140
 141 static int mbox_credits = GNILND_MBOX_CREDITS;
 142 CFS_MODULE_PARM(mbox_credits, "i", int, 0644,
 143                 "number of credits per mailbox");
 144
 145 static int sched_threads = GNILND_SCHED_THREADS;
 146 CFS_MODULE_PARM(sched_threads, "i", int, 0444,
 147                 "number of threads for moving data");
 148
 149 static int net_hash_size = 11;
 150 CFS_MODULE_PARM(net_hash_size, "i", int, 0444,
 151                 "prime number for net hash sizing, default 11");
 152
 153 static int hardware_timeout = GNILND_HARDWARE_TIMEOUT;
 154 CFS_MODULE_PARM(hardware_timeout, "i", int, 0444,
 155                 "maximum time for traffic to get from one node to another");
 156
 157 static int mdd_timeout = GNILND_MDD_TIMEOUT;
 158 CFS_MODULE_PARM(mdd_timeout, "i", int, 0644,
 159                 "maximum time (in minutes) for mdd to be held");
 160
 161 static int sched_timeout = GNILND_SCHED_TIMEOUT;
 162 CFS_MODULE_PARM(sched_timeout, "i", int, 0644,
 163                 "scheduler aliveness in seconds max time");
 164
 165 static int sched_nice = GNILND_SCHED_NICE;
 166 CFS_MODULE_PARM(sched_nice, "i", int, 0444,
 167                 "scheduler's nice setting, default compute 0 service -20");
 168
 169 static int reverse_rdma = GNILND_REVERSE_RDMA;
 170 CFS_MODULE_PARM(reverse_rdma, "i", int, 0644,
 171                 "Normal 0: Reverse GET: 1 Reverse Put: 2 Reverse Both: 3");
 172
 173 static int dgram_timeout = GNILND_DGRAM_TIMEOUT;
 174 CFS_MODULE_PARM(dgram_timeout, "i", int, 0644,
 175                 "dgram thread aliveness seconds max time");
 176
 177 static int efault_lbug = 0;
 178 CFS_MODULE_PARM(efault_lbug, "i", int, 0644,
 179                 "If a compute receives an EFAULT in"
 180                 " a message should it LBUG. 0 off 1 on");
 181
 182 static int fast_reconn = GNILND_FAST_RECONNECT;
 183 CFS_MODULE_PARM(fast_reconn, "i", int, 0644,
 184                 "fast reconnect on connection timeout");
 185
 186 static int max_conn_purg = GNILND_PURGATORY_MAX;
 187 CFS_MODULE_PARM(max_conn_purg, "i", int, 0644,
 188                 "Max number of connections per peer in purgatory");
 189
 190 static int thread_affinity = 0;
 191 CFS_MODULE_PARM(thread_affinity, "i", int, 0444,
 192                 "scheduler thread affinity default 0 (diabled)");
 193
 194 kgn_tunables_t kgnilnd_tunables = {
 195         .kgn_min_reconnect_interval = &min_reconnect_interval,
 196         .kgn_max_reconnect_interval = &max_reconnect_interval,
 197         .kgn_credits                = &credits,
 198         .kgn_peer_credits           = &peer_credits,
 199         .kgn_concurrent_sends       = &concurrent_sends,
 200         .kgn_fma_cq_size            = &fma_cq_size,
 201         .kgn_timeout                = &timeout,
 202         .kgn_max_immediate          = &max_immediate,
 203         .kgn_checksum               = &checksum,
 204         .kgn_checksum_dump          = &checksum_dump,
 205         .kgn_bte_dlvr_mode          = &bte_dlvr_mode,
 206         .kgn_bte_relaxed_ordering   = &bte_relaxed_ordering,
 207         .kgn_ptag                   = &ptag,
 208         .kgn_max_retransmits        = &max_retransmits,
 209         .kgn_nwildcard              = &nwildcard,
 210         .kgn_nice                   = &nice,
 211         .kgn_rdmaq_intervals        = &rdmaq_intervals,
 212         .kgn_loops                  = &loops,
 213         .kgn_peer_hash_size         = &hash_size,
 214         .kgn_peer_health            = &peer_health,
 215         .kgn_peer_timeout           = &peer_timeout,
 216         .kgn_vmap_cksum             = &vmap_cksum,
 217         .kgn_mbox_per_block         = &mbox_per_block,
 218         .kgn_nphys_mbox             = &nphys_mbox,
 219         .kgn_mbox_credits           = &mbox_credits,
 220         .kgn_sched_threads          = &sched_threads,
 221         .kgn_net_hash_size          = &net_hash_size,
 222         .kgn_hardware_timeout       = &hardware_timeout,
 223         .kgn_mdd_timeout            = &mdd_timeout,
 224         .kgn_sched_timeout          = &sched_timeout,
 225         .kgn_sched_nice             = &sched_nice,
 226         .kgn_reverse_rdma           = &reverse_rdma,
 227         .kgn_dgram_timeout          = &dgram_timeout,
 228         .kgn_eager_credits          = &eager_credits,
 229         .kgn_fast_reconn            = &fast_reconn,
 230         .kgn_efault_lbug            = &efault_lbug,
 231         .kgn_thread_affinity        = &thread_affinity,
 232         .kgn_max_purgatory          = &max_conn_purg
 233 };
 234
 235 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 236 static struct ctl_table kgnilnd_ctl_table[] = {
 237         {
 238                 INIT_CTL_NAME
 239                 .procname = "min_reconnect_interval",
 240                 .data     = &min_reconnect_interval,
 241                 .maxlen   = sizeof(int),
 242                 .mode     = 0644,
 243                 .proc_handler = &proc_dointvec
 244         },
 245         {
 246                 INIT_CTL_NAME
 247                 .procname = "max_reconnect_interval",
 248                 .data     = &max_reconnect_interval,
 249                 .maxlen   = sizeof(int),
 250                 .mode     = 0644,
 251                 .proc_handler = &proc_dointvec
 252         },
 253         {
 254                 INIT_CTL_NAME
 255                 .procname = "credits",
 256                 .data     = &credits,
 257                 .maxlen   = sizeof(int),
 258                 .mode     = 0444,
 259                 .proc_handler = &proc_dointvec
 260         },
 261         {
 262                 INIT_CTL_NAME
 263                 .procname = "peer_credits",
 264                 .data     = &peer_credits,
 265                 .maxlen   = sizeof(int),
 266                 .mode     = 0444,
 267                 .proc_handler = &proc_dointvec
 268         },
 269         {
 270                 INIT_CTL_NAME
 271                 .procname = "fma_cq_size",
 272                 .data     = &fma_cq_size,
 273                 .maxlen   = sizeof(int),
 274                 .mode     = 0444,
 275                 .proc_handler = &proc_dointvec
 276         },
 277         {
 278                 INIT_CTL_NAME
 279                 .procname = "timeout",
 280                 .data     = &timeout,
 281                 .maxlen   = sizeof(int),
 282                 .mode     = 0444,
 283                 .proc_handler = &proc_dointvec
 284         },
 285         {
 286                 INIT_CTL_NAME
 287                 .procname = "max_immediate",
 288                 .data     = &max_immediate,
 289                 .maxlen   = sizeof(int),
 290                 .mode     = 0444,
 291                 .proc_handler = &proc_dointvec
 292         },
 293         {
 294                 INIT_CTL_NAME
 295                 .procname = "checksum",
 296                 .data     = &checksum,
 297                 .maxlen   = sizeof(int),
 298                 .mode     = 0644,
 299                 .proc_handler = &proc_dointvec
 300         },
 301         {
 302                 INIT_CTL_NAME
 303                 .procname = "bte_dlvr_mode",
 304                 .data     = &bte_dlvr_mode,
 305                 .maxlen   = sizeof(int),
 306                 .mode     = 0644,
 307                 .proc_handler = &proc_dointvec
 308         },
 309         {
 310                 INIT_CTL_NAME
 311                 .procname = "ptag",
 312                 .data     = &ptag,
 313                 .maxlen   = sizeof(int),
 314                 .mode     = 0444,
 315                 .proc_handler = &proc_dointvec
 316         },
 317         {
 318                 INIT_CTL_NAME
 319                 .procname = "nwildcard",
 320                 .data     = &nwildcard,
 321                 .maxlen   = sizeof(int),
 322                 .mode     = 0444,
 323                 .proc_handler = &proc_dointvec
 324         },
 325         {
 326                 INIT_CTL_NAME
 327                 .procname = "bte_relaxed_ordering",
 328                 .data     = &bte_relaxed_ordering,
 329                 .maxlen   = sizeof(int),
 330                 .mode     = 0644,
 331                 .proc_handler = &proc_dointvec
 332         },
 333         {
 334                 INIT_CTL_NAME
 335                 .procname = "checksum_dump",
 336                 .data     = &checksum_dump,
 337                 .maxlen   = sizeof(int),
 338                 .mode     = 0644,
 339                 .proc_handler = &proc_dointvec
 340         },
 341         {
 342                 INIT_CTL_NAME
 343                 .procname = "nice",
 344                 .data     = &nice,
 345                 .maxlen   = sizeof(int),
 346                 .mode     = 0444,
 347                 .proc_handler = &proc_dointvec
 348         },
 349         {
 350                 INIT_CTL_NAME
 351                 .procname = "rdmaq_intervals",
 352                 .data     = &rdmaq_intervals,
 353                 .maxlen   = sizeof(int),
 354                 .mode     = 0644,
 355                 .proc_handler = &proc_dointvec
 356         },
 357         {
 358                 INIT_CTL_NAME
 359                 .procname = "loops",
 360                 .data     = &loops,
 361                 .maxlen   = sizeof(int),
 362                 .mode     = 0644,
 363                 .proc_handler = &proc_dointvec
 364         },
 365         {
 366                 INIT_CTL_NAME
 367                 .procname = "hash_size",
 368                 .data     = &hash_size,
 369                 .maxlen   = sizeof(int),
 370                 .mode     = 0444,
 371                 .proc_handler = &proc_dointvec
 372         },
 373         {
 374                 INIT_CTL_NAME
 375                 .procname = "peer_health",
 376                 .data     = &peer_health,
 377                 .maxlen   = sizeof(int),
 378                 .mode     = 0444,
 379                 .proc_handler = &proc_dointvec
 380         },
 381         {
 382                 INIT_CTL_NAME
 383                 .procname = "vmap_cksum",
 384                 .data     = &vmap_cksum,
 385                 .maxlen   = sizeof(int),
 386                 .mode     = 0644,
 387                 .proc_handler = &proc_dointvec
 388         },
 389         {
 390                 INIT_CTL_NAME
 391                 .procname = "mbox_per_block",
 392                 .data     = &mbox_per_block,
 393                 .maxlen   = sizeof(int),
 394                 .mode     = 0644,
 395                 .proc_handler = &proc_dointvec
 396         },
 397         {
 398                 INIT_CTL_NAME
 399                 .procname = "mbox_credits"
 400                 .data     = &mbox_credits,
 401                 .maxlen   = sizeof(int),
 402                 .mode     = 0644,
 403                 .proc_handler = &proc_dointvec
 404         },
 405         {
 406                 INIT_CTL_NAME
 407                 .procname = "sched_threads"
 408                 .data     = &sched_threads,
 409                 .maxlen   = sizeof(int),
 410                 .mode     = 0444,
 411                 .proc_handler = &proc_dointvec
 412         },
 413         {
 414                 INIT_CTL_NAME
 415                 .procname = "net_hash_size",
 416                 .data     = &net_hash_size,
 417                 .maxlen   = sizeof(int),
 418                 .mode     = 0444,
 419                 .proc_handler = &proc_dointvec
 420         },
 421         {
 422                 INIT_CTL_NAME
 423                 .procname = "hardware_timeout",
 424                 .data     = &hardware_timeout,
 425                 .maxlen   = sizeof(int),
 426                 .mode     = 0444,
 427                 .proc_handler = &proc_dointvec
 428         },
 429         {
 430                 INIT_CTL_NAME
 431                 .procname = "mdd_timeout",
 432                 .data     = &mdd_timeout,
 433                 .maxlen   = sizeof(int),
 434                 .mode     = 0644,
 435                 .proc_handler = &proc_dointvec
 436         },
 437         {
 438                 INIT_CTL_NAME
 439                 .procname = "max_retransmits"
 440                 .data     = &max_retransmits,
 441                 .maxlen   = sizeof(int),
 442                 .mode     = 0444,
 443                 .proc_handler = &proc_dointvec
 444         },
 445         {
 446                 INIT_CTL_NAME
 447                 .procname = "concurrent_sends",
 448                 .data     = &concurrent_sends,
 449                 .maxlen   = sizeof(int),
 450                 .mode     = 0444,
 451                 .proc_handler = &proc_dointvec
 452         },
 453         {
 454                 INIT_CTL_NAME
 455                 .procname = "nphys_mbox",
 456                 .data     = &nphys_mbox,
 457                 .maxlen   = sizeof(int),
 458                 .mode     = 0444,
 459                 .proc_handler = &proc_dointvec
 460         },
 461         {
 462                 INIT_CTL_NAME
 463                 .procname = "sched_timeout",
 464                 .data     = &sched_timeout,
 465                 .maxlen   = sizeof(int),
 466                 .mode     = 0644,
 467                 .proc_handler = &proc_dointvec
 468         },
 469         {
 470                 INIT_CTL_NAME
 471                 .procname = "sched_nice",
 472                 .data     = &sched_nice,
 473                 .maxlen   = sizeof(int),
 474                 .mode     = 0444,
 475                 .proc_handler = &proc_dointvec
 476         },
 477         {
 478                 INIT_CTL_NAME
 479                 .procname = "reverse_rdma",
 480                 .data     = &reverse_rdma,
 481                 .maxlen   = sizeof(int),
 482                 .mode     = 0644,
 483                 .proc_handler = &proc_dointvec
 484         },
 485                 INIT_CTL_NAME
 486                 .procname = "dgram_timeout"
 487                 .data     = &dgram_timeout,
 488                 .maxlen   = sizeof(int),
 489                 .mode     = 0644,
 490                 .proc_handler = &proc_dointvec
 491         },
 492         {
 493                 INIT_CTL_NAME
 494                 .procname = "peer_timeout"
 495                 .data     = &peer_timeout,
 496                 .maxlen   = sizeof(int),
 497                 .mode     = 0444,
 498                 .proc_handler = &proc_dointvec
 499         },
 500         {
 501                 INIT_CTL_NAME
 502                 .procname = "eager_credits",
 503                 .data     = &eager_credits,
 504                 .maxlen   = sizeof(int),
 505                 .mode     = 0644,
 506                 .proc_handler = &proc_dointvec
 507         },
 508         {
 509                 INIT_CTL_NAME
 510                 .procname = "efault_lbug"
 511                 .data     = &efault_lbug,
 512                 .maxlen   = sizeof(int),
 513                 .mode     = 0644,
 514                 .proc_handler = &proc_dointvec
 515         },
 516         {
 517                 INIT_CTL_NAME
 518                 .procname = "thread_affinity"
 519                 .data     = &thread_affinity,
 520                 .maxlen   = sizeof(int),
 521                 .mode     = 0444,
 522                 .proc_handler = &proc_dointvec
 523         },
 524         {
 525                 INIT_CTL_NAME
 526                 .procname = "max_conn_purg"
 527                 .data     = &max_conn_purg,
 528                 .maxlen   = sizeof(int),
 529                 .mode     = 0644,
 530                 .proc_handler = &proc_dointvec
 531         },
 532         { 0 }
 533 };
 534
 535 static struct ctl_table kgnilnd_top_ctl_table[] = {
 536         {
 537                 INIT_CTL_NAME
 538                 .procname = "gnilnd",
 539                 .data     = NULL,
 540                 .maxlen   = 0,
 541                 .mode     = 0555,
 542                 .child    = kgnilnd_ctl_table
 543         },
 544         { 0 }
 545 };
 546 #endif
 547
 548 int
 549 kgnilnd_tunables_init()
 550 {
 551         int rc = 0;
 552
 553 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 554         kgnilnd_tunables.kgn_sysctl =
 555                 cfs_register_sysctl_table(kgnilnd_top_ctl_table, 0);
 556
 557         if (kgnilnd_tunables.kgn_sysctl == NULL)
 558                 CWARN("Can't setup /proc tunables\n");
 559 #endif
 560         switch (*kgnilnd_tunables.kgn_checksum) {
 561         default:
 562                 CERROR("Invalid checksum module parameter: %d\n",
 563                        *kgnilnd_tunables.kgn_checksum);
 564                 rc = -EINVAL;
 565                 GOTO(out, rc);
 566         case GNILND_CHECKSUM_OFF:
 567                 /* no checksumming */
 568                 break;
 569         case GNILND_CHECKSUM_SMSG_HEADER:
 570                 LCONSOLE_INFO("SMSG header only checksumming enabled\n");
 571                 break;
 572         case GNILND_CHECKSUM_SMSG:
 573                 LCONSOLE_INFO("SMSG checksumming enabled\n");
 574                 break;
 575         case GNILND_CHECKSUM_SMSG_BTE:
 576                 LCONSOLE_INFO("SMSG + BTE checksumming enabled\n");
 577                 break;
 578         }
 579
 580         if (*kgnilnd_tunables.kgn_max_immediate > GNILND_MAX_IMMEDIATE) {
 581                 LCONSOLE_ERROR("kgnilnd module parameter 'max_immediate' too large %d > %d\n",
 582                 *kgnilnd_tunables.kgn_max_immediate, GNILND_MAX_IMMEDIATE);
 583                 rc = -EINVAL;
 584                 GOTO(out, rc);
 585         }
 586
 587         if (*kgnilnd_tunables.kgn_mbox_per_block < 1) {
 588                 *kgnilnd_tunables.kgn_mbox_per_block = 1;
 589         }
 590
 591         if (*kgnilnd_tunables.kgn_concurrent_sends == 0) {
 592                 *kgnilnd_tunables.kgn_concurrent_sends = *kgnilnd_tunables.kgn_peer_credits;
 593         } else if (*kgnilnd_tunables.kgn_concurrent_sends > *kgnilnd_tunables.kgn_peer_credits) {
 594                 LCONSOLE_ERROR("kgnilnd parameter 'concurrent_sends' too large: %d > %d (peer_credits)\n",
 595                                *kgnilnd_tunables.kgn_concurrent_sends, *kgnilnd_tunables.kgn_peer_credits);
 596                 rc = -EINVAL;
 597         }
 598 out:
 599         return rc;
 600 }
 601
 602 void
 603 kgnilnd_tunables_fini()
 604 {
 605 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 606         if (kgnilnd_tunables.kgn_sysctl != NULL)
 607                 cfs_unregister_sysctl_table(kgnilnd_tunables.kgn_sysctl);
 608 #endif
 609 }