drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_modparams.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/klnds/o2iblnd/o2iblnd_modparams.c
  37  *
  38  * Author: Eric Barton <eric@bartonsoftware.com>
  39  */
  40
  41 #include "o2iblnd.h"
  42
  43 static int service = 987;
  44 module_param(service, int, 0444);
  45 MODULE_PARM_DESC(service, "service number (within RDMA_PS_TCP)");
  46
  47 static int cksum = 0;
  48 module_param(cksum, int, 0644);
  49 MODULE_PARM_DESC(cksum, "set non-zero to enable message (not RDMA) checksums");
  50
  51 static int timeout = 50;
  52 module_param(timeout, int, 0644);
  53 MODULE_PARM_DESC(timeout, "timeout (seconds)");
  54
  55 /* Number of threads in each scheduler pool which is percpt,
  56  * we will estimate reasonable value based on CPUs if it's set to zero. */
  57 static int nscheds;
  58 module_param(nscheds, int, 0444);
  59 MODULE_PARM_DESC(nscheds, "number of threads in each scheduler pool");
  60
  61 /* NB: this value is shared by all CPTs, it can grow at runtime */
  62 static int ntx = 512;
  63 module_param(ntx, int, 0444);
  64 MODULE_PARM_DESC(ntx, "# of message descriptors allocated for each pool");
  65
  66 /* NB: this value is shared by all CPTs */
  67 static int credits = 256;
  68 module_param(credits, int, 0444);
  69 MODULE_PARM_DESC(credits, "# concurrent sends");
  70
  71 static int peer_credits = 8;
  72 module_param(peer_credits, int, 0444);
  73 MODULE_PARM_DESC(peer_credits, "# concurrent sends to 1 peer");
  74
  75 static int peer_credits_hiw = 0;
  76 module_param(peer_credits_hiw, int, 0444);
  77 MODULE_PARM_DESC(peer_credits_hiw, "when eagerly to return credits");
  78
  79 static int peer_buffer_credits = 0;
  80 module_param(peer_buffer_credits, int, 0444);
  81 MODULE_PARM_DESC(peer_buffer_credits, "# per-peer router buffer credits");
  82
  83 static int peer_timeout = 180;
  84 module_param(peer_timeout, int, 0444);
  85 MODULE_PARM_DESC(peer_timeout, "Seconds without aliveness news to declare peer dead (<=0 to disable)");
  86
  87 static char *ipif_name = "ib0";
  88 module_param(ipif_name, charp, 0444);
  89 MODULE_PARM_DESC(ipif_name, "IPoIB interface name");
  90
  91 static int retry_count = 5;
  92 module_param(retry_count, int, 0644);
  93 MODULE_PARM_DESC(retry_count, "Retransmissions when no ACK received");
  94
  95 static int rnr_retry_count = 6;
  96 module_param(rnr_retry_count, int, 0644);
  97 MODULE_PARM_DESC(rnr_retry_count, "RNR retransmissions");
  98
  99 static int keepalive = 100;
 100 module_param(keepalive, int, 0644);
 101 MODULE_PARM_DESC(keepalive, "Idle time in seconds before sending a keepalive");
 102
 103 static int ib_mtu = 0;
 104 module_param(ib_mtu, int, 0444);
 105 MODULE_PARM_DESC(ib_mtu, "IB MTU 256/512/1024/2048/4096");
 106
 107 static int concurrent_sends = 0;
 108 module_param(concurrent_sends, int, 0444);
 109 MODULE_PARM_DESC(concurrent_sends, "send work-queue sizing");
 110
 111 static int map_on_demand = 0;
 112 module_param(map_on_demand, int, 0444);
 113 MODULE_PARM_DESC(map_on_demand, "map on demand");
 114
 115 /* NB: this value is shared by all CPTs, it can grow at runtime */
 116 static int fmr_pool_size = 512;
 117 module_param(fmr_pool_size, int, 0444);
 118 MODULE_PARM_DESC(fmr_pool_size, "size of fmr pool on each CPT (>= ntx / 4)");
 119
 120 /* NB: this value is shared by all CPTs, it can grow at runtime */
 121 static int fmr_flush_trigger = 384;
 122 module_param(fmr_flush_trigger, int, 0444);
 123 MODULE_PARM_DESC(fmr_flush_trigger, "# dirty FMRs that triggers pool flush");
 124
 125 static int fmr_cache = 1;
 126 module_param(fmr_cache, int, 0444);
 127 MODULE_PARM_DESC(fmr_cache, "non-zero to enable FMR caching");
 128
 129 /* NB: this value is shared by all CPTs, it can grow at runtime */
 130 static int pmr_pool_size = 512;
 131 module_param(pmr_pool_size, int, 0444);
 132 MODULE_PARM_DESC(pmr_pool_size, "size of MR cache pmr pool on each CPT");
 133
 134 /*
 135  * 0: disable failover
 136  * 1: enable failover if necessary
 137  * 2: force to failover (for debug)
 138  */
 139 static int dev_failover = 0;
 140 module_param(dev_failover, int, 0444);
 141 MODULE_PARM_DESC(dev_failover, "HCA failover for bonding (0 off, 1 on, other values reserved)");
 142
 143
 144 static int require_privileged_port = 0;
 145 module_param(require_privileged_port, int, 0644);
 146 MODULE_PARM_DESC(require_privileged_port, "require privileged port when accepting connection");
 147
 148 static int use_privileged_port = 1;
 149 module_param(use_privileged_port, int, 0644);
 150 MODULE_PARM_DESC(use_privileged_port, "use privileged port when initiating connection");
 151
 152 kib_tunables_t kiblnd_tunables = {
 153         .kib_dev_failover          = &dev_failover,
 154         .kib_service            = &service,
 155         .kib_cksum                = &cksum,
 156         .kib_timeout            = &timeout,
 157         .kib_keepalive        = &keepalive,
 158         .kib_ntx                    = &ntx,
 159         .kib_credits            = &credits,
 160         .kib_peertxcredits        = &peer_credits,
 161         .kib_peercredits_hiw    = &peer_credits_hiw,
 162         .kib_peerrtrcredits      = &peer_buffer_credits,
 163         .kib_peertimeout            = &peer_timeout,
 164         .kib_default_ipif          = &ipif_name,
 165         .kib_retry_count            = &retry_count,
 166         .kib_rnr_retry_count    = &rnr_retry_count,
 167         .kib_concurrent_sends       = &concurrent_sends,
 168         .kib_ib_mtu              = &ib_mtu,
 169         .kib_map_on_demand        = &map_on_demand,
 170         .kib_fmr_pool_size        = &fmr_pool_size,
 171         .kib_fmr_flush_trigger      = &fmr_flush_trigger,
 172         .kib_fmr_cache        = &fmr_cache,
 173         .kib_pmr_pool_size        = &pmr_pool_size,
 174         .kib_require_priv_port      = &require_privileged_port,
 175         .kib_use_priv_port          = &use_privileged_port,
 176         .kib_nscheds                = &nscheds
 177 };
 178
 179 int
 180 kiblnd_tunables_init (void)
 181 {
 182         if (kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu) < 0) {
 183                 CERROR("Invalid ib_mtu %d, expected 256/512/1024/2048/4096\n",
 184                        *kiblnd_tunables.kib_ib_mtu);
 185                 return -EINVAL;
 186         }
 187
 188         if (*kiblnd_tunables.kib_peertxcredits < IBLND_CREDITS_DEFAULT)
 189                 *kiblnd_tunables.kib_peertxcredits = IBLND_CREDITS_DEFAULT;
 190
 191         if (*kiblnd_tunables.kib_peertxcredits > IBLND_CREDITS_MAX)
 192                 *kiblnd_tunables.kib_peertxcredits = IBLND_CREDITS_MAX;
 193
 194         if (*kiblnd_tunables.kib_peertxcredits > *kiblnd_tunables.kib_credits)
 195                 *kiblnd_tunables.kib_peertxcredits = *kiblnd_tunables.kib_credits;
 196
 197         if (*kiblnd_tunables.kib_peercredits_hiw < *kiblnd_tunables.kib_peertxcredits / 2)
 198                 *kiblnd_tunables.kib_peercredits_hiw = *kiblnd_tunables.kib_peertxcredits / 2;
 199
 200         if (*kiblnd_tunables.kib_peercredits_hiw >= *kiblnd_tunables.kib_peertxcredits)
 201                 *kiblnd_tunables.kib_peercredits_hiw = *kiblnd_tunables.kib_peertxcredits - 1;
 202
 203         if (*kiblnd_tunables.kib_map_on_demand < 0 ||
 204             *kiblnd_tunables.kib_map_on_demand > IBLND_MAX_RDMA_FRAGS)
 205                 *kiblnd_tunables.kib_map_on_demand = 0; /* disable map-on-demand */
 206
 207         if (*kiblnd_tunables.kib_map_on_demand == 1)
 208                 *kiblnd_tunables.kib_map_on_demand = 2; /* don't make sense to create map if only one fragment */
 209
 210         if (*kiblnd_tunables.kib_concurrent_sends == 0) {
 211                 if (*kiblnd_tunables.kib_map_on_demand > 0 &&
 212                     *kiblnd_tunables.kib_map_on_demand <= IBLND_MAX_RDMA_FRAGS / 8)
 213                         *kiblnd_tunables.kib_concurrent_sends = (*kiblnd_tunables.kib_peertxcredits) * 2;
 214                 else
 215                         *kiblnd_tunables.kib_concurrent_sends = (*kiblnd_tunables.kib_peertxcredits);
 216         }
 217
 218         if (*kiblnd_tunables.kib_concurrent_sends > *kiblnd_tunables.kib_peertxcredits * 2)
 219                 *kiblnd_tunables.kib_concurrent_sends = *kiblnd_tunables.kib_peertxcredits * 2;
 220
 221         if (*kiblnd_tunables.kib_concurrent_sends < *kiblnd_tunables.kib_peertxcredits / 2)
 222                 *kiblnd_tunables.kib_concurrent_sends = *kiblnd_tunables.kib_peertxcredits / 2;
 223
 224         if (*kiblnd_tunables.kib_concurrent_sends < *kiblnd_tunables.kib_peertxcredits) {
 225                 CWARN("Concurrent sends %d is lower than message queue size: %d, "
 226                       "performance may drop slightly.\n",
 227                       *kiblnd_tunables.kib_concurrent_sends, *kiblnd_tunables.kib_peertxcredits);
 228         }
 229
 230         return 0;
 231 }