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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2016, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lnet/klnds/o2iblnd/o2iblnd_modparams.c
  33  *
  34  * Author: Eric Barton <eric@bartonsoftware.com>
  35  */
  36
  37 #include "o2iblnd.h"
  38
  39 static int service = 987;
  40 module_param(service, int, 0444);
  41 MODULE_PARM_DESC(service, "service number (within RDMA_PS_TCP)");
  42
  43 static int cksum = 0;
  44 module_param(cksum, int, 0644);
  45 MODULE_PARM_DESC(cksum, "set non-zero to enable message (not RDMA) checksums");
  46
  47 static int timeout = 50;
  48 module_param(timeout, int, 0644);
  49 MODULE_PARM_DESC(timeout, "timeout (seconds)");
  50
  51 /* Number of threads in each scheduler pool which is percpt,
  52  * we will estimate reasonable value based on CPUs if it's set to zero. */
  53 static int nscheds;
  54 module_param(nscheds, int, 0444);
  55 MODULE_PARM_DESC(nscheds, "number of threads in each scheduler pool");
  56
  57 /* NB: this value is shared by all CPTs, it can grow at runtime */
  58 static int ntx = 512;
  59 module_param(ntx, int, 0444);
  60 MODULE_PARM_DESC(ntx, "# of message descriptors allocated for each pool");
  61
  62 /* NB: this value is shared by all CPTs */
  63 static int credits = 256;
  64 module_param(credits, int, 0444);
  65 MODULE_PARM_DESC(credits, "# concurrent sends");
  66
  67 static int peer_credits = 8;
  68 module_param(peer_credits, int, 0444);
  69 MODULE_PARM_DESC(peer_credits, "# concurrent sends to 1 peer");
  70
  71 static int peer_credits_hiw = 0;
  72 module_param(peer_credits_hiw, int, 0444);
  73 MODULE_PARM_DESC(peer_credits_hiw, "when eagerly to return credits");
  74
  75 static int peer_buffer_credits = 0;
  76 module_param(peer_buffer_credits, int, 0444);
  77 MODULE_PARM_DESC(peer_buffer_credits, "# per-peer router buffer credits");
  78
  79 static int peer_timeout = 180;
  80 module_param(peer_timeout, int, 0444);
  81 MODULE_PARM_DESC(peer_timeout, "Seconds without aliveness news to declare peer dead (<=0 to disable)");
  82
  83 static char *ipif_name = "ib0";
  84 module_param(ipif_name, charp, 0444);
  85 MODULE_PARM_DESC(ipif_name, "IPoIB interface name");
  86
  87 static int retry_count = 5;
  88 module_param(retry_count, int, 0644);
  89 MODULE_PARM_DESC(retry_count, "Retransmissions when no ACK received");
  90
  91 static int rnr_retry_count = 6;
  92 module_param(rnr_retry_count, int, 0644);
  93 MODULE_PARM_DESC(rnr_retry_count, "RNR retransmissions");
  94
  95 static int keepalive = 100;
  96 module_param(keepalive, int, 0644);
  97 MODULE_PARM_DESC(keepalive, "Idle time in seconds before sending a keepalive");
  98
  99 static int ib_mtu;
 100 module_param(ib_mtu, int, 0444);
 101 MODULE_PARM_DESC(ib_mtu, "IB MTU 256/512/1024/2048/4096");
 102
 103 static int concurrent_sends;
 104 module_param(concurrent_sends, int, 0444);
 105 MODULE_PARM_DESC(concurrent_sends, "send work-queue sizing");
 106
 107 #ifdef HAVE_IB_GET_DMA_MR
 108 #define IBLND_DEFAULT_MAP_ON_DEMAND 0
 109 #define IBLND_MIN_MAP_ON_DEMAND 0
 110 #else
 111 #define IBLND_DEFAULT_MAP_ON_DEMAND IBLND_MAX_RDMA_FRAGS
 112 #define IBLND_MIN_MAP_ON_DEMAND 1
 113 #endif
 114 static int map_on_demand = IBLND_DEFAULT_MAP_ON_DEMAND;
 115 module_param(map_on_demand, int, 0444);
 116 MODULE_PARM_DESC(map_on_demand, "map on demand");
 117
 118 /* NB: this value is shared by all CPTs, it can grow at runtime */
 119 static int fmr_pool_size = 512;
 120 module_param(fmr_pool_size, int, 0444);
 121 MODULE_PARM_DESC(fmr_pool_size, "size of fmr pool on each CPT (>= ntx / 4)");
 122
 123 /* NB: this value is shared by all CPTs, it can grow at runtime */
 124 static int fmr_flush_trigger = 384;
 125 module_param(fmr_flush_trigger, int, 0444);
 126 MODULE_PARM_DESC(fmr_flush_trigger, "# dirty FMRs that triggers pool flush");
 127
 128 static int fmr_cache = 1;
 129 module_param(fmr_cache, int, 0444);
 130 MODULE_PARM_DESC(fmr_cache, "non-zero to enable FMR caching");
 131
 132 /*
 133  * 0: disable failover
 134  * 1: enable failover if necessary
 135  * 2: force to failover (for debug)
 136  */
 137 static int dev_failover = 0;
 138 module_param(dev_failover, int, 0444);
 139 MODULE_PARM_DESC(dev_failover, "HCA failover for bonding (0 off, 1 on, other values reserved)");
 140
 141 static int require_privileged_port;
 142 module_param(require_privileged_port, int, 0644);
 143 MODULE_PARM_DESC(require_privileged_port, "require privileged port when accepting connection");
 144
 145 static int use_privileged_port = 1;
 146 module_param(use_privileged_port, int, 0644);
 147 MODULE_PARM_DESC(use_privileged_port, "use privileged port when initiating connection");
 148
 149 static unsigned int wrq_sge = 1;
 150 module_param(wrq_sge, uint, 0444);
 151 MODULE_PARM_DESC(wrq_sge, "# scatter/gather element per work request");
 152
 153 kib_tunables_t kiblnd_tunables = {
 154         .kib_dev_failover           = &dev_failover,
 155         .kib_service                = &service,
 156         .kib_cksum                  = &cksum,
 157         .kib_timeout                = &timeout,
 158         .kib_keepalive              = &keepalive,
 159         .kib_ntx                    = &ntx,
 160         .kib_default_ipif           = &ipif_name,
 161         .kib_retry_count            = &retry_count,
 162         .kib_rnr_retry_count        = &rnr_retry_count,
 163         .kib_ib_mtu                 = &ib_mtu,
 164         .kib_require_priv_port      = &require_privileged_port,
 165         .kib_use_priv_port          = &use_privileged_port,
 166         .kib_nscheds                = &nscheds,
 167         .kib_wrq_sge                = &wrq_sge,
 168 };
 169
 170 static struct lnet_ioctl_config_o2iblnd_tunables default_tunables;
 171
 172 /* # messages/RDMAs in-flight */
 173 int
 174 kiblnd_msg_queue_size(int version, struct lnet_ni *ni)
 175 {
 176         if (version == IBLND_MSG_VERSION_1)
 177                 return IBLND_MSG_QUEUE_SIZE_V1;
 178         else if (ni)
 179                 return ni->ni_net->net_tunables.lct_peer_tx_credits;
 180         else
 181                 return peer_credits;
 182 }
 183
 184 int
 185 kiblnd_tunables_setup(struct lnet_ni *ni)
 186 {
 187         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
 188         struct lnet_ioctl_config_lnd_cmn_tunables *net_tunables;
 189
 190         /*
 191          * if there was no tunables specified, setup the tunables to be
 192          * defaulted
 193          */
 194         if (!ni->ni_lnd_tunables_set)
 195                 memcpy(&ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib,
 196                        &default_tunables, sizeof(*tunables));
 197
 198         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
 199
 200         /* Current API version */
 201         tunables->lnd_version = 0;
 202
 203         if (kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu) < 0) {
 204                 CERROR("Invalid ib_mtu %d, expected 256/512/1024/2048/4096\n",
 205                        *kiblnd_tunables.kib_ib_mtu);
 206                 return -EINVAL;
 207         }
 208
 209         net_tunables = &ni->ni_net->net_tunables;
 210
 211         if (net_tunables->lct_peer_timeout == -1)
 212                 net_tunables->lct_peer_timeout = peer_timeout;
 213
 214         if (net_tunables->lct_max_tx_credits == -1)
 215                 net_tunables->lct_max_tx_credits = credits;
 216
 217         if (net_tunables->lct_peer_tx_credits == -1)
 218                 net_tunables->lct_peer_tx_credits = peer_credits;
 219
 220         if (net_tunables->lct_peer_rtr_credits == -1)
 221                 net_tunables->lct_peer_rtr_credits = peer_buffer_credits;
 222
 223         if (net_tunables->lct_peer_tx_credits < IBLND_CREDITS_DEFAULT)
 224                 net_tunables->lct_peer_tx_credits = IBLND_CREDITS_DEFAULT;
 225
 226         if (net_tunables->lct_peer_tx_credits > IBLND_CREDITS_MAX)
 227                 net_tunables->lct_peer_tx_credits = IBLND_CREDITS_MAX;
 228
 229         if (net_tunables->lct_peer_tx_credits >
 230             net_tunables->lct_max_tx_credits)
 231                 net_tunables->lct_peer_tx_credits =
 232                         net_tunables->lct_max_tx_credits;
 233
 234         if (!tunables->lnd_peercredits_hiw)
 235                 tunables->lnd_peercredits_hiw = peer_credits_hiw;
 236
 237         if (tunables->lnd_peercredits_hiw < net_tunables->lct_peer_tx_credits / 2)
 238                 tunables->lnd_peercredits_hiw = net_tunables->lct_peer_tx_credits / 2;
 239
 240         if (tunables->lnd_peercredits_hiw >= net_tunables->lct_peer_tx_credits)
 241                 tunables->lnd_peercredits_hiw = net_tunables->lct_peer_tx_credits - 1;
 242
 243         if (tunables->lnd_map_on_demand < IBLND_MIN_MAP_ON_DEMAND ||
 244             tunables->lnd_map_on_demand > IBLND_MAX_RDMA_FRAGS) {
 245                 /* Use the default */
 246                 CWARN("Invalid map_on_demand (%d), expects %d - %d. Using default of %d\n",
 247                       tunables->lnd_map_on_demand, IBLND_MIN_MAP_ON_DEMAND,
 248                       IBLND_MAX_RDMA_FRAGS, IBLND_DEFAULT_MAP_ON_DEMAND);
 249                 tunables->lnd_map_on_demand = IBLND_DEFAULT_MAP_ON_DEMAND;
 250         }
 251
 252         if (tunables->lnd_map_on_demand == 1) {
 253                 /* don't make sense to create map if only one fragment */
 254                 tunables->lnd_map_on_demand = 2;
 255         }
 256
 257         if (tunables->lnd_concurrent_sends == 0) {
 258                 if (tunables->lnd_map_on_demand > 0 &&
 259                     tunables->lnd_map_on_demand <= IBLND_MAX_RDMA_FRAGS / 8) {
 260                         tunables->lnd_concurrent_sends =
 261                                         net_tunables->lct_peer_tx_credits * 2;
 262                 } else {
 263                         tunables->lnd_concurrent_sends =
 264                                 net_tunables->lct_peer_tx_credits;
 265                 }
 266         }
 267
 268         if (tunables->lnd_concurrent_sends > net_tunables->lct_peer_tx_credits * 2)
 269                 tunables->lnd_concurrent_sends = net_tunables->lct_peer_tx_credits * 2;
 270
 271         if (tunables->lnd_concurrent_sends < net_tunables->lct_peer_tx_credits / 2)
 272                 tunables->lnd_concurrent_sends = net_tunables->lct_peer_tx_credits / 2;
 273
 274         if (tunables->lnd_concurrent_sends < net_tunables->lct_peer_tx_credits) {
 275                 CWARN("Concurrent sends %d is lower than message "
 276                       "queue size: %d, performance may drop slightly.\n",
 277                       tunables->lnd_concurrent_sends,
 278                       net_tunables->lct_peer_tx_credits);
 279         }
 280
 281         if (!tunables->lnd_fmr_pool_size)
 282                 tunables->lnd_fmr_pool_size = fmr_pool_size;
 283         if (!tunables->lnd_fmr_flush_trigger)
 284                 tunables->lnd_fmr_flush_trigger = fmr_flush_trigger;
 285         if (!tunables->lnd_fmr_cache)
 286                 tunables->lnd_fmr_cache = fmr_cache;
 287
 288         return 0;
 289 }
 290
 291 int
 292 kiblnd_tunables_init(void)
 293 {
 294         default_tunables.lnd_version = 0;
 295         default_tunables.lnd_peercredits_hiw = peer_credits_hiw,
 296         default_tunables.lnd_map_on_demand = map_on_demand;
 297         default_tunables.lnd_concurrent_sends = concurrent_sends;
 298         default_tunables.lnd_fmr_pool_size = fmr_pool_size;
 299         default_tunables.lnd_fmr_flush_trigger = fmr_flush_trigger;
 300         default_tunables.lnd_fmr_cache = fmr_cache;
 301         return 0;
 302 }