lnet/klnds/socklnd/socklnd_modparams.c

   1 /*
   2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Copyright (c) 2011, 2012, Intel Corporation.
   5  *
   6  *   Author: Eric Barton <eric@bartonsoftware.com>
   7  *
   8  *   Portals is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Portals is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Portals; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "socklnd.h"
  23
  24 #include <linux/kvm_host.h>
  25 #if defined(__x86_64__) || defined(__i386__)
  26 #include <asm/hypervisor.h>
  27 #endif
  28 #ifdef HAVE_ETHTOOL_LINK_SETTINGS
  29 #include <linux/inetdevice.h>
  30 #include <linux/ethtool.h>
  31 #endif
  32
  33 #define CURRENT_LND_VERSION 1
  34
  35 static int sock_timeout;
  36 module_param(sock_timeout, int, 0644);
  37 MODULE_PARM_DESC(sock_timeout, "dead socket timeout (seconds)");
  38
  39 static int credits = DEFAULT_CREDITS;
  40 module_param(credits, int, 0444);
  41 MODULE_PARM_DESC(credits, "# concurrent sends");
  42
  43 static int peer_credits = DEFAULT_PEER_CREDITS;
  44 module_param(peer_credits, int, 0444);
  45 MODULE_PARM_DESC(peer_credits, "# concurrent sends to 1 peer");
  46
  47 static int peer_buffer_credits;
  48 module_param(peer_buffer_credits, int, 0444);
  49 MODULE_PARM_DESC(peer_buffer_credits, "# per-peer router buffer credits");
  50
  51 static int peer_timeout = DEFAULT_PEER_TIMEOUT;
  52 module_param(peer_timeout, int, 0444);
  53 MODULE_PARM_DESC(peer_timeout, "Seconds without aliveness news to declare peer dead (<=0 to disable)");
  54
  55 /* Number of daemons in each thread pool which is percpt,
  56  * we will estimate reasonable value based on CPUs if it's not set. */
  57 static unsigned int nscheds;
  58 module_param(nscheds, int, 0444);
  59 MODULE_PARM_DESC(nscheds, "# scheduler daemons in each pool while starting");
  60
  61 static int nconnds = 4;
  62 module_param(nconnds, int, 0444);
  63 MODULE_PARM_DESC(nconnds, "# connection daemons while starting");
  64
  65 static int nconnds_max = 64;
  66 module_param(nconnds_max, int, 0444);
  67 MODULE_PARM_DESC(nconnds_max, "max # connection daemons");
  68
  69 static int min_reconnectms = 1000;
  70 module_param(min_reconnectms, int, 0644);
  71 MODULE_PARM_DESC(min_reconnectms, "min connection retry interval (mS)");
  72
  73 static int max_reconnectms = 60000;
  74 module_param(max_reconnectms, int, 0644);
  75 MODULE_PARM_DESC(max_reconnectms, "max connection retry interval (mS)");
  76
  77 static int eager_ack;
  78 module_param(eager_ack, int, 0644);
  79 MODULE_PARM_DESC(eager_ack, "send tcp ack packets eagerly");
  80
  81 static int typed_conns = 1;
  82 module_param(typed_conns, int, 0444);
  83 MODULE_PARM_DESC(typed_conns, "use different sockets for bulk");
  84
  85 static int min_bulk = (1<<10);
  86 module_param(min_bulk, int, 0644);
  87 MODULE_PARM_DESC(min_bulk, "smallest 'large' message");
  88
  89 # define DEFAULT_BUFFER_SIZE 0
  90 static int tx_buffer_size = DEFAULT_BUFFER_SIZE;
  91 module_param(tx_buffer_size, int, 0644);
  92 MODULE_PARM_DESC(tx_buffer_size, "socket tx buffer size (0 for system default)");
  93
  94 static int rx_buffer_size = DEFAULT_BUFFER_SIZE;
  95 module_param(rx_buffer_size, int, 0644);
  96 MODULE_PARM_DESC(rx_buffer_size, "socket rx buffer size (0 for system default)");
  97
  98 static int nagle = 0;
  99 module_param(nagle, int, 0644);
 100 MODULE_PARM_DESC(nagle, "enable NAGLE?");
 101
 102 static int round_robin = 1;
 103 module_param(round_robin, int, 0644);
 104 MODULE_PARM_DESC(round_robin, "Round robin for multiple interfaces");
 105
 106 static int keepalive = 30;
 107 module_param(keepalive, int, 0644);
 108 MODULE_PARM_DESC(keepalive, "# seconds before send keepalive");
 109
 110 static int keepalive_idle = 30;
 111 module_param(keepalive_idle, int, 0644);
 112 MODULE_PARM_DESC(keepalive_idle, "# idle seconds before probe");
 113
 114 #define DEFAULT_KEEPALIVE_COUNT  5
 115 static int keepalive_count = DEFAULT_KEEPALIVE_COUNT;
 116 module_param(keepalive_count, int, 0644);
 117 MODULE_PARM_DESC(keepalive_count, "# missed probes == dead");
 118
 119 static int keepalive_intvl = 5;
 120 module_param(keepalive_intvl, int, 0644);
 121 MODULE_PARM_DESC(keepalive_intvl, "seconds between probes");
 122
 123 static int enable_csum = 0;
 124 module_param(enable_csum, int, 0644);
 125 MODULE_PARM_DESC(enable_csum, "enable check sum");
 126
 127 static int inject_csum_error = 0;
 128 module_param(inject_csum_error, int, 0644);
 129 MODULE_PARM_DESC(inject_csum_error, "set non-zero to inject a checksum error");
 130
 131 static int enable_irq_affinity = 0;
 132 module_param(enable_irq_affinity, int, 0644);
 133 MODULE_PARM_DESC(enable_irq_affinity, "enable IRQ affinity");
 134
 135 static int nonblk_zcack = 1;
 136 module_param(nonblk_zcack, int, 0644);
 137 MODULE_PARM_DESC(nonblk_zcack, "always send ZC-ACK on non-blocking connection");
 138
 139 static unsigned int zc_min_payload = (16 << 10);
 140 module_param(zc_min_payload, int, 0644);
 141 MODULE_PARM_DESC(zc_min_payload, "minimum payload size to zero copy");
 142
 143 static unsigned int zc_recv = 0;
 144 module_param(zc_recv, int, 0644);
 145 MODULE_PARM_DESC(zc_recv, "enable ZC recv for Chelsio driver");
 146
 147 static unsigned int zc_recv_min_nfrags = 16;
 148 module_param(zc_recv_min_nfrags, int, 0644);
 149 MODULE_PARM_DESC(zc_recv_min_nfrags, "minimum # of fragments to enable ZC recv");
 150
 151 static unsigned int conns_per_peer = DEFAULT_CONNS_PER_PEER;
 152 module_param(conns_per_peer, uint, 0644);
 153 MODULE_PARM_DESC(conns_per_peer, "number of connections per peer");
 154
 155 #ifdef SOCKNAL_BACKOFF
 156 static int backoff_init = 3;
 157 module_param(backoff_init, int, 0644);
 158 MODULE_PARM_DESC(backoff_init, "seconds for initial tcp backoff");
 159
 160 static int backoff_max = 3;
 161 module_param(backoff_max, int, 0644);
 162 MODULE_PARM_DESC(backoff_max, "seconds for maximum tcp backoff");
 163 #endif
 164
 165 #if SOCKNAL_VERSION_DEBUG
 166 static int protocol = 3;
 167 module_param(protocol, int, 0644);
 168 MODULE_PARM_DESC(protocol, "protocol version");
 169 #endif
 170
 171 static inline bool is_native_host(void)
 172 {
 173 #ifdef HAVE_HYPERVISOR_IS_TYPE
 174         return hypervisor_is_type(X86_HYPER_NATIVE);
 175 #elif defined(__x86_64__) || defined(__i386__)
 176         return x86_hyper == NULL;
 177 #else
 178         return true;
 179 #endif
 180 }
 181
 182 struct ksock_tunables ksocknal_tunables;
 183 static struct lnet_ioctl_config_socklnd_tunables default_tunables;
 184
 185 #ifdef HAVE_ETHTOOL_LINK_SETTINGS
 186 static int ksocklnd_ni_get_eth_intf_speed(struct lnet_ni *ni)
 187 {
 188         struct net_device *dev;
 189         int intf_idx = -1;
 190         int ret = -1;
 191
 192         DECLARE_CONST_IN_IFADDR(ifa);
 193
 194         rtnl_lock();
 195         for_each_netdev(ni->ni_net_ns, dev) {
 196                 int flags = dev_get_flags(dev);
 197                 struct in_device *in_dev;
 198
 199                 if (flags & IFF_LOOPBACK) /* skip the loopback IF */
 200                         continue;
 201
 202                 if (!(flags & IFF_UP))
 203                         continue;
 204
 205                 in_dev = __in_dev_get_rcu(dev);
 206                 if (!in_dev)
 207                         continue;
 208
 209                 in_dev_for_each_ifa_rcu(ifa, in_dev) {
 210                         if (strcmp(ifa->ifa_label, ni->ni_interface) == 0)
 211                                 intf_idx = dev->ifindex;
 212                 }
 213                 endfor_ifa(in_dev);
 214
 215                 if (intf_idx >= 0)
 216                         break;
 217         }
 218         if (intf_idx >= 0) {
 219                 struct ethtool_link_ksettings cmd;
 220                 int ethtool_ret;
 221
 222                 /* Some devices may not be providing link settings */
 223                 ethtool_ret = __ethtool_get_link_ksettings(dev, &cmd);
 224                 if (!ethtool_ret)
 225                         ret = cmd.base.speed;
 226                 else
 227                         ret = ethtool_ret;
 228         }
 229         rtnl_unlock();
 230
 231         return ret;
 232 }
 233
 234 static int ksocklnd_speed2cpp(int speed)
 235 {
 236         /* Use the minimum of 1Gbps to avoid calling ilog2 with 0 */
 237         if (speed < 1000)
 238                 speed = 1000;
 239
 240         /* Pick heuristically optimal conns_per_peer value
 241          * for the specified ethernet interface speed (Mbps)
 242          */
 243         return ilog2(speed/1000) / 2 + 1;
 244 }
 245 #endif
 246
 247 static int ksocklnd_lookup_conns_per_peer(struct lnet_ni *ni)
 248 {
 249         int cpp = DEFAULT_CONNS_PER_PEER;
 250 #ifdef HAVE_ETHTOOL_LINK_SETTINGS
 251         int speed = ksocklnd_ni_get_eth_intf_speed(ni);
 252
 253         CDEBUG(D_NET, "intf %s speed %d\n", ni->ni_interface, speed);
 254         if (speed > 0)
 255                 cpp = ksocklnd_speed2cpp(speed);
 256 #endif
 257         return cpp;
 258 }
 259
 260 int ksocknal_tunables_init(void)
 261 {
 262         default_tunables.lnd_version = CURRENT_LND_VERSION;
 263         default_tunables.lnd_conns_per_peer = conns_per_peer;
 264
 265         /* initialize ksocknal_tunables structure */
 266         ksocknal_tunables.ksnd_timeout            = &sock_timeout;
 267         ksocknal_tunables.ksnd_nscheds            = &nscheds;
 268         ksocknal_tunables.ksnd_nconnds            = &nconnds;
 269         ksocknal_tunables.ksnd_nconnds_max        = &nconnds_max;
 270         ksocknal_tunables.ksnd_min_reconnectms    = &min_reconnectms;
 271         ksocknal_tunables.ksnd_max_reconnectms    = &max_reconnectms;
 272         ksocknal_tunables.ksnd_eager_ack          = &eager_ack;
 273         ksocknal_tunables.ksnd_typed_conns        = &typed_conns;
 274         ksocknal_tunables.ksnd_min_bulk           = &min_bulk;
 275         ksocknal_tunables.ksnd_tx_buffer_size     = &tx_buffer_size;
 276         ksocknal_tunables.ksnd_rx_buffer_size     = &rx_buffer_size;
 277         ksocknal_tunables.ksnd_nagle              = &nagle;
 278         ksocknal_tunables.ksnd_round_robin        = &round_robin;
 279         ksocknal_tunables.ksnd_keepalive          = &keepalive;
 280         ksocknal_tunables.ksnd_keepalive_idle     = &keepalive_idle;
 281         ksocknal_tunables.ksnd_keepalive_count    = &keepalive_count;
 282         ksocknal_tunables.ksnd_keepalive_intvl    = &keepalive_intvl;
 283         ksocknal_tunables.ksnd_credits            = &credits;
 284         ksocknal_tunables.ksnd_peertxcredits      = &peer_credits;
 285         ksocknal_tunables.ksnd_peerrtrcredits     = &peer_buffer_credits;
 286         ksocknal_tunables.ksnd_peertimeout        = &peer_timeout;
 287         ksocknal_tunables.ksnd_enable_csum        = &enable_csum;
 288         ksocknal_tunables.ksnd_inject_csum_error  = &inject_csum_error;
 289         ksocknal_tunables.ksnd_nonblk_zcack       = &nonblk_zcack;
 290         ksocknal_tunables.ksnd_zc_min_payload     = &zc_min_payload;
 291         ksocknal_tunables.ksnd_zc_recv            = &zc_recv;
 292         ksocknal_tunables.ksnd_zc_recv_min_nfrags = &zc_recv_min_nfrags;
 293         if (conns_per_peer > ((1 << SOCKNAL_CONN_COUNT_MAX_BITS)-1)) {
 294                 CWARN("socklnd conns_per_peer is capped at %u.\n",
 295                       (1 << SOCKNAL_CONN_COUNT_MAX_BITS)-1);
 296         }
 297         ksocknal_tunables.ksnd_conns_per_peer     = &conns_per_peer;
 298
 299         if (enable_irq_affinity) {
 300                 CWARN("irq_affinity is removed from socklnd because modern "
 301                       "computer always has fast CPUs and more cores than "
 302                       "# NICs, although you still can set irq_affinity by "
 303                       "another way, please check manual for details.\n");
 304         }
 305         ksocknal_tunables.ksnd_irq_affinity       = &enable_irq_affinity;
 306
 307 #ifdef SOCKNAL_BACKOFF
 308         ksocknal_tunables.ksnd_backoff_init       = &backoff_init;
 309         ksocknal_tunables.ksnd_backoff_max        = &backoff_max;
 310 #endif
 311
 312 #if SOCKNAL_VERSION_DEBUG
 313         ksocknal_tunables.ksnd_protocol           = &protocol;
 314 #endif
 315
 316         if (*ksocknal_tunables.ksnd_zc_min_payload < (2 << 10))
 317                 *ksocknal_tunables.ksnd_zc_min_payload = (2 << 10);
 318
 319         /* When on a hypervisor set the minimum zero copy size
 320          * above the maximum payload size
 321          */
 322         if (!is_native_host())
 323                 *ksocknal_tunables.ksnd_zc_min_payload = (16 << 20) + 1;
 324
 325         return 0;
 326 }
 327
 328 void ksocknal_tunables_setup(struct lnet_ni *ni)
 329 {
 330         struct lnet_ioctl_config_socklnd_tunables *tunables;
 331         struct lnet_ioctl_config_lnd_cmn_tunables *net_tunables;
 332
 333         /* If no tunables specified, setup default tunables */
 334         if (!ni->ni_lnd_tunables_set)
 335                 memcpy(&ni->ni_lnd_tunables.lnd_tun_u.lnd_sock,
 336                        &default_tunables, sizeof(*tunables));
 337
 338         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_sock;
 339
 340         /* Current API version */
 341         tunables->lnd_version = CURRENT_LND_VERSION;
 342
 343         net_tunables = &ni->ni_net->net_tunables;
 344
 345         if (net_tunables->lct_peer_timeout == -1)
 346                 net_tunables->lct_peer_timeout =
 347                         *ksocknal_tunables.ksnd_peertimeout;
 348
 349         if (net_tunables->lct_max_tx_credits == -1)
 350                 net_tunables->lct_max_tx_credits =
 351                         *ksocknal_tunables.ksnd_credits;
 352
 353         if (net_tunables->lct_peer_tx_credits == -1)
 354                 net_tunables->lct_peer_tx_credits =
 355                         *ksocknal_tunables.ksnd_peertxcredits;
 356
 357         if (net_tunables->lct_peer_tx_credits >
 358             net_tunables->lct_max_tx_credits)
 359                 net_tunables->lct_peer_tx_credits =
 360                         net_tunables->lct_max_tx_credits;
 361
 362         if (net_tunables->lct_peer_rtr_credits == -1)
 363                 net_tunables->lct_peer_rtr_credits =
 364                         *ksocknal_tunables.ksnd_peerrtrcredits;
 365
 366         if (!tunables->lnd_conns_per_peer)
 367                 tunables->lnd_conns_per_peer =
 368                         ksocklnd_lookup_conns_per_peer(ni);
 369 }