lnet/lnet/router_proc.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   5  *
   6  *   This file is part of Portals
   7  *   http://sourceforge.net/projects/sandiaportals/
   8  *
   9  *   Portals is free software; you can redistribute it and/or
  10  *   modify it under the terms of version 2 of the GNU General Public
  11  *   License as published by the Free Software Foundation.
  12  *
  13  *   Portals is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with Portals; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  */
  23
  24 #define DEBUG_SUBSYSTEM S_LNET
  25 #include <libcfs/libcfs.h>
  26 #include <lnet/lib-lnet.h>
  27
  28 #if defined(__KERNEL__) && defined(LNET_ROUTER)
  29
  30 /* this is really lnet_proc.c */
  31
  32 static cfs_sysctl_table_header_t *lnet_table_header = NULL;
  33
  34 #ifndef HAVE_SYSCTL_UNNUMBERED
  35 #define CTL_LNET         (0x100)
  36 enum {
  37         PSDEV_LNET_STATS = 100,
  38         PSDEV_LNET_ROUTES,
  39         PSDEV_LNET_ROUTERS,
  40         PSDEV_LNET_PEERS,
  41         PSDEV_LNET_BUFFERS,
  42         PSDEV_LNET_NIS,
  43 };
  44 #else
  45 #define CTL_LNET           CTL_UNNUMBERED
  46 #define PSDEV_LNET_STATS   CTL_UNNUMBERED
  47 #define PSDEV_LNET_ROUTES  CTL_UNNUMBERED
  48 #define PSDEV_LNET_ROUTERS CTL_UNNUMBERED
  49 #define PSDEV_LNET_PEERS   CTL_UNNUMBERED
  50 #define PSDEV_LNET_BUFFERS CTL_UNNUMBERED
  51 #define PSDEV_LNET_NIS     CTL_UNNUMBERED
  52 #endif
  53
  54 /*
  55  * NB: we don't use the highest bit of *ppos because it's signed;
  56  *     next 9 bits is used to stash idx (assuming that
  57  *     LNET_PEER_HASHSIZE < 512)
  58  */
  59 #define LNET_LOFFT_BITS        (sizeof(loff_t) * 8)
  60 #define LNET_VERSION_BITS      MAX(((MIN(LNET_LOFFT_BITS, 64)) / 4), 8)
  61 #define LNET_PHASH_IDX_BITS    9
  62 #define LNET_PHASH_NUM_BITS    (LNET_LOFFT_BITS - 1 -\
  63                                 LNET_VERSION_BITS - LNET_PHASH_IDX_BITS)
  64 #define LNET_PHASH_BITS        (LNET_PHASH_IDX_BITS + LNET_PHASH_NUM_BITS)
  65
  66 #define LNET_VERSION_BITMASK   ((1ULL << LNET_VERSION_BITS) - 1)
  67 #define LNET_PHASH_IDX_BITMASK ((1ULL << LNET_PHASH_IDX_BITS) - 1)
  68 #define LNET_PHASH_NUM_BITMASK ((1ULL << LNET_PHASH_NUM_BITS) - 1)
  69
  70 #define LNET_VERSION_MASK      (LNET_VERSION_BITMASK << LNET_PHASH_BITS)
  71 #define LNET_PHASH_IDX_MASK    (LNET_PHASH_IDX_BITMASK << LNET_PHASH_NUM_BITS)
  72 #define LNET_PHASH_NUM_MASK    (LNET_PHASH_NUM_BITMASK)
  73
  74 #define LNET_VERSION_GET(pos)   (int)(((pos) & LNET_VERSION_MASK) >> \
  75                                      LNET_PHASH_BITS)
  76 #define LNET_PHASH_IDX_GET(pos) (int)(((pos) & LNET_PHASH_IDX_MASK) >> \
  77                                       LNET_PHASH_NUM_BITS)
  78 #define LNET_PHASH_NUM_GET(pos) (int)((pos) & LNET_PHASH_NUM_MASK)
  79 #define LNET_VERSION_VALID_MASK(ver) \
  80                                 (unsigned int)((ver) & \
  81                                  LNET_VERSION_BITMASK)
  82 #define LNET_PHASH_POS_MAKE(ver, idx, num)                                     \
  83                                 (((((loff_t)(ver)) & LNET_VERSION_BITMASK) <<  \
  84                                    LNET_PHASH_BITS) |                          \
  85                                  ((((loff_t)(idx)) & LNET_PHASH_IDX_BITMASK) <<\
  86                                    LNET_PHASH_NUM_BITS) |                      \
  87                                  ((num) & LNET_PHASH_NUM_BITMASK))
  88
  89 static int __proc_lnet_stats(void *data, int write,
  90                              loff_t pos, void *buffer, int nob)
  91 {
  92         int              rc;
  93         lnet_counters_t *ctrs;
  94         int              len;
  95         char            *tmpstr;
  96         const int        tmpsiz = 256; /* 7 %u and 4 LPU64 */
  97
  98         if (write) {
  99                 LNET_LOCK();
 100                 memset(&the_lnet.ln_counters, 0, sizeof(the_lnet.ln_counters));
 101                 LNET_UNLOCK();
 102                 return 0;
 103         }
 104
 105         /* read */
 106
 107         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
 108         if (ctrs == NULL)
 109                 return -ENOMEM;
 110
 111         LIBCFS_ALLOC(tmpstr, tmpsiz);
 112         if (tmpstr == NULL) {
 113                 LIBCFS_FREE(ctrs, sizeof(*ctrs));
 114                 return -ENOMEM;
 115         }
 116
 117         LNET_LOCK();
 118         *ctrs = the_lnet.ln_counters;
 119         LNET_UNLOCK();
 120
 121         len = snprintf(tmpstr, tmpsiz,
 122                        "%u %u %u %u %u %u %u "LPU64" "LPU64" "
 123                        LPU64" "LPU64,
 124                        ctrs->msgs_alloc, ctrs->msgs_max,
 125                        ctrs->errors,
 126                        ctrs->send_count, ctrs->recv_count,
 127                        ctrs->route_count, ctrs->drop_count,
 128                        ctrs->send_length, ctrs->recv_length,
 129                        ctrs->route_length, ctrs->drop_length);
 130
 131         if (pos >= min_t(int, len, strlen(tmpstr)))
 132                 rc = 0;
 133         else
 134                 rc = cfs_trace_copyout_string(buffer, nob,
 135                                               tmpstr + pos, "\n");
 136
 137         LIBCFS_FREE(tmpstr, tmpsiz);
 138         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 139         return rc;
 140 }
 141
 142 DECLARE_PROC_HANDLER(proc_lnet_stats);
 143
 144 int LL_PROC_PROTO(proc_lnet_routes)
 145 {
 146         int        rc     = 0;
 147         char      *tmpstr;
 148         char      *s;
 149         const int  tmpsiz = 256;
 150         int        len;
 151         int        ver;
 152         int        num;
 153
 154         DECLARE_LL_PROC_PPOS_DECL;
 155
 156         num = LNET_PHASH_NUM_GET(*ppos);
 157         ver = LNET_VERSION_GET(*ppos);
 158
 159         LASSERT (!write);
 160
 161         if (*lenp == 0)
 162                 return 0;
 163
 164         LIBCFS_ALLOC(tmpstr, tmpsiz);
 165         if (tmpstr == NULL)
 166                 return -ENOMEM;
 167
 168         s = tmpstr; /* points to current position in tmpstr[] */
 169
 170         if (*ppos == 0) {
 171                 s += snprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 172                               the_lnet.ln_routing ? "enabled" : "disabled");
 173                 LASSERT (tmpstr + tmpsiz - s > 0);
 174
 175                 s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %7s %s\n",
 176                               "net", "hops", "state", "router");
 177                 LASSERT (tmpstr + tmpsiz - s > 0);
 178
 179                 LNET_LOCK();
 180                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 181                 LNET_UNLOCK();
 182                 *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 183         } else {
 184                 cfs_list_t        *n;
 185                 cfs_list_t        *r;
 186                 lnet_route_t      *route = NULL;
 187                 lnet_remotenet_t  *rnet  = NULL;
 188                 int                skip  = num - 1;
 189
 190                 LNET_LOCK();
 191
 192                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_remote_nets_version)) {
 193                         LNET_UNLOCK();
 194                         LIBCFS_FREE(tmpstr, tmpsiz);
 195                         return -ESTALE;
 196                 }
 197
 198                 n = the_lnet.ln_remote_nets.next;
 199
 200                 while (n != &the_lnet.ln_remote_nets && route == NULL) {
 201                         rnet = cfs_list_entry(n, lnet_remotenet_t, lrn_list);
 202
 203                         r = rnet->lrn_routes.next;
 204
 205                         while (r != &rnet->lrn_routes) {
 206                                 lnet_route_t *re =
 207                                         cfs_list_entry(r, lnet_route_t,
 208                                                        lr_list);
 209                                 if (skip == 0) {
 210                                         route = re;
 211                                         break;
 212                                 }
 213
 214                                 skip--;
 215                                 r = r->next;
 216                         }
 217
 218                         n = n->next;
 219                 }
 220
 221                 if (route != NULL) {
 222                         __u32        net   = rnet->lrn_net;
 223                         unsigned int hops  = route->lr_hops;
 224                         lnet_nid_t   nid   = route->lr_gateway->lp_nid;
 225                         int          alive = route->lr_gateway->lp_alive;
 226
 227                         s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4u %7s %s\n",
 228                                       libcfs_net2str(net), hops,
 229                                       alive ? "up" : "down", libcfs_nid2str(nid));
 230                         LASSERT (tmpstr + tmpsiz - s > 0);
 231                 }
 232
 233                 LNET_UNLOCK();
 234         }
 235
 236         len = s - tmpstr;     /* how many bytes was written */
 237
 238         if (len > *lenp) {    /* linux-supplied buffer is too small */
 239                 rc = -EINVAL;
 240         } else if (len > 0) { /* wrote something */
 241                 if (cfs_copy_to_user(buffer, tmpstr, len))
 242                         rc = -EFAULT;
 243                 else {
 244                         num += 1;
 245                         *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 246                 }
 247         }
 248
 249         LIBCFS_FREE(tmpstr, tmpsiz);
 250
 251         if (rc == 0)
 252                 *lenp = len;
 253
 254         return rc;
 255 }
 256
 257 int LL_PROC_PROTO(proc_lnet_routers)
 258 {
 259         int        rc = 0;
 260         char      *tmpstr;
 261         char      *s;
 262         const int  tmpsiz = 256;
 263         int        len;
 264         int        ver;
 265         int        num;
 266
 267         DECLARE_LL_PROC_PPOS_DECL;
 268
 269         num = LNET_PHASH_NUM_GET(*ppos);
 270         ver = LNET_VERSION_GET(*ppos);
 271
 272         LASSERT (!write);
 273
 274         if (*lenp == 0)
 275                 return 0;
 276
 277         LIBCFS_ALLOC(tmpstr, tmpsiz);
 278         if (tmpstr == NULL)
 279                 return -ENOMEM;
 280
 281         s = tmpstr; /* points to current position in tmpstr[] */
 282
 283         if (*ppos == 0) {
 284                 s += snprintf(s, tmpstr + tmpsiz - s,
 285                               "%-4s %7s %9s %6s %12s %9s %8s %7s %s\n",
 286                               "ref", "rtr_ref", "alive_cnt", "state", "last_ping",
 287                               "ping_sent", "deadline", "down_ni", "router");
 288                 LASSERT (tmpstr + tmpsiz - s > 0);
 289
 290                 LNET_LOCK();
 291                 ver = (unsigned int)the_lnet.ln_routers_version;
 292                 LNET_UNLOCK();
 293                 *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 294         } else {
 295                 cfs_list_t        *r;
 296                 lnet_peer_t       *peer = NULL;
 297                 int                skip = num - 1;
 298
 299                 LNET_LOCK();
 300
 301                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_routers_version)) {
 302                         LNET_UNLOCK();
 303                         LIBCFS_FREE(tmpstr, tmpsiz);
 304                         return -ESTALE;
 305                 }
 306
 307                 r = the_lnet.ln_routers.next;
 308
 309                 while (r != &the_lnet.ln_routers) {
 310                         lnet_peer_t *lp = cfs_list_entry(r, lnet_peer_t,
 311                                                          lp_rtr_list);
 312
 313                         if (skip == 0) {
 314                                 peer = lp;
 315                                 break;
 316                         }
 317
 318                         skip--;
 319                         r = r->next;
 320                 }
 321
 322                 if (peer != NULL) {
 323                         lnet_nid_t nid = peer->lp_nid;
 324                         cfs_time_t now = cfs_time_current();
 325                         cfs_time_t deadline = peer->lp_ping_deadline;
 326                         int nrefs     = peer->lp_refcount;
 327                         int nrtrrefs  = peer->lp_rtr_refcount;
 328                         int alive_cnt = peer->lp_alive_count;
 329                         int alive     = peer->lp_alive;
 330                         int pingsent  = !peer->lp_ping_notsent;
 331                         int last_ping = cfs_duration_sec(cfs_time_sub(now,
 332                                                      peer->lp_ping_timestamp));
 333                         int down_ni   = lnet_router_down_ni(peer,
 334                                                     LNET_NIDNET(LNET_NID_ANY));
 335
 336                         if (deadline == 0)
 337                                 s += snprintf(s, tmpstr + tmpsiz - s,
 338                                               "%-4d %7d %9d %6s %12d %9d %8s %7d %s\n",
 339                                               nrefs, nrtrrefs, alive_cnt,
 340                                               alive ? "up" : "down", last_ping,
 341                                               pingsent, "NA", down_ni,
 342                                               libcfs_nid2str(nid));
 343                         else
 344                                 s += snprintf(s, tmpstr + tmpsiz - s,
 345                                               "%-4d %7d %9d %6s %12d %9d %8lu %7d %s\n",
 346                                               nrefs, nrtrrefs, alive_cnt,
 347                                               alive ? "up" : "down", last_ping,
 348                                               pingsent,
 349                                               cfs_duration_sec(cfs_time_sub(deadline, now)),
 350                                               down_ni, libcfs_nid2str(nid));
 351                         LASSERT (tmpstr + tmpsiz - s > 0);
 352                 }
 353
 354                 LNET_UNLOCK();
 355         }
 356
 357         len = s - tmpstr;     /* how many bytes was written */
 358
 359         if (len > *lenp) {    /* linux-supplied buffer is too small */
 360                 rc = -EINVAL;
 361         } else if (len > 0) { /* wrote something */
 362                 if (cfs_copy_to_user(buffer, tmpstr, len))
 363                         rc = -EFAULT;
 364                 else {
 365                         num += 1;
 366                         *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 367                 }
 368         }
 369
 370         LIBCFS_FREE(tmpstr, tmpsiz);
 371
 372         if (rc == 0)
 373                 *lenp = len;
 374
 375         return rc;
 376 }
 377
 378 int LL_PROC_PROTO(proc_lnet_peers)
 379 {
 380         int        rc = 0;
 381         char      *tmpstr;
 382         char      *s;
 383         const int  tmpsiz      = 256;
 384         int        len;
 385         int        ver;
 386         int        idx;
 387         int        num;
 388
 389         DECLARE_LL_PROC_PPOS_DECL;
 390
 391         idx = LNET_PHASH_IDX_GET(*ppos);
 392         num = LNET_PHASH_NUM_GET(*ppos);
 393         ver = LNET_VERSION_GET(*ppos);
 394
 395         CLASSERT ((1ULL << LNET_PHASH_BITS) > LNET_PEER_HASHSIZE);
 396
 397         LASSERT (!write);
 398
 399         if (*lenp == 0)
 400                 return 0;
 401
 402         LIBCFS_ALLOC(tmpstr, tmpsiz);
 403         if (tmpstr == NULL)
 404                 return -ENOMEM;
 405
 406         s = tmpstr; /* points to current position in tmpstr[] */
 407
 408         if (*ppos == 0) {
 409                 s += snprintf(s, tmpstr + tmpsiz - s,
 410                               "%-24s %4s %5s %5s %5s %5s %5s %5s %s\n",
 411                               "nid", "refs", "state", "max",
 412                               "rtr", "min", "tx", "min", "queue");
 413                 LASSERT (tmpstr + tmpsiz - s > 0);
 414
 415                 LNET_LOCK();
 416                 ver = (unsigned int)the_lnet.ln_peertable_version;
 417                 LNET_UNLOCK();
 418                 *ppos = LNET_PHASH_POS_MAKE(ver, idx, num);
 419
 420                 num++;
 421         } else {
 422                 cfs_list_t        *p    = NULL;
 423                 lnet_peer_t       *peer = NULL;
 424                 int                skip = num - 1;
 425
 426                 LNET_LOCK();
 427
 428                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_peertable_version)) {
 429                         LNET_UNLOCK();
 430                         LIBCFS_FREE(tmpstr, tmpsiz);
 431                         return -ESTALE;
 432                 }
 433
 434                 while (idx < LNET_PEER_HASHSIZE) {
 435                         if (p == NULL)
 436                                 p = the_lnet.ln_peer_hash[idx].next;
 437
 438                         while (p != &the_lnet.ln_peer_hash[idx]) {
 439                                 lnet_peer_t *lp = cfs_list_entry(p, lnet_peer_t,
 440                                                                  lp_hashlist);
 441                                 if (skip == 0) {
 442                                         peer = lp;
 443
 444                                         /* minor optimiztion: start from idx+1
 445                                          * on next iteration if we've just
 446                                          * drained lp_hashlist */
 447                                         if (lp->lp_hashlist.next ==
 448                                             &the_lnet.ln_peer_hash[idx]) {
 449                                                 num = 1;
 450                                                 idx++;
 451                                         } else {
 452                                                 num++;
 453                                         }
 454
 455                                         break;
 456                                 }
 457
 458                                 skip--;
 459                                 p = lp->lp_hashlist.next;
 460                         }
 461
 462                         if (peer != NULL)
 463                                 break;
 464
 465                         p = NULL;
 466                         num = 1;
 467                         idx++;
 468                 }
 469
 470                 if (peer != NULL) {
 471                         lnet_nid_t nid       = peer->lp_nid;
 472                         int        nrefs     = peer->lp_refcount;
 473                         char      *aliveness = "NA";
 474                         int        maxcr     = peer->lp_ni->ni_peertxcredits;
 475                         int        txcr      = peer->lp_txcredits;
 476                         int        mintxcr   = peer->lp_mintxcredits;
 477                         int        rtrcr     = peer->lp_rtrcredits;
 478                         int        minrtrcr  = peer->lp_minrtrcredits;
 479                         int        txqnob    = peer->lp_txqnob;
 480
 481                         if (lnet_isrouter(peer) ||
 482                             lnet_peer_aliveness_enabled(peer))
 483                                 aliveness = peer->lp_alive ? "up" : "down";
 484
 485                         s += snprintf(s, tmpstr + tmpsiz - s,
 486                                       "%-24s %4d %5s %5d %5d %5d %5d %5d %d\n",
 487                                       libcfs_nid2str(nid), nrefs, aliveness,
 488                                       maxcr, rtrcr, minrtrcr, txcr,
 489                                       mintxcr, txqnob);
 490                         LASSERT (tmpstr + tmpsiz - s > 0);
 491                 }
 492
 493                 LNET_UNLOCK();
 494         }
 495
 496         len = s - tmpstr;     /* how many bytes was written */
 497
 498         if (len > *lenp) {    /* linux-supplied buffer is too small */
 499                 rc = -EINVAL;
 500         } else if (len > 0) { /* wrote something */
 501                 if (cfs_copy_to_user(buffer, tmpstr, len))
 502                         rc = -EFAULT;
 503                 else
 504                         *ppos = LNET_PHASH_POS_MAKE(ver, idx, num);
 505         }
 506
 507         LIBCFS_FREE(tmpstr, tmpsiz);
 508
 509         if (rc == 0)
 510                 *lenp = len;
 511
 512         return rc;
 513 }
 514
 515 static int __proc_lnet_buffers(void *data, int write,
 516                                loff_t pos, void *buffer, int nob)
 517 {
 518
 519         int              rc;
 520         int              len;
 521         char            *s;
 522         char            *tmpstr;
 523         const int        tmpsiz = 64 * (LNET_NRBPOOLS + 1); /* (4 %d) * 4 */
 524         int              idx;
 525
 526         LASSERT (!write);
 527
 528         LIBCFS_ALLOC(tmpstr, tmpsiz);
 529         if (tmpstr == NULL)
 530                 return -ENOMEM;
 531
 532         s = tmpstr; /* points to current position in tmpstr[] */
 533
 534         s += snprintf(s, tmpstr + tmpsiz - s,
 535                       "%5s %5s %7s %7s\n",
 536                       "pages", "count", "credits", "min");
 537         LASSERT (tmpstr + tmpsiz - s > 0);
 538
 539         LNET_LOCK();
 540
 541         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 542                 lnet_rtrbufpool_t *rbp = &the_lnet.ln_rtrpools[idx];
 543
 544                 int npages = rbp->rbp_npages;
 545                 int nbuf   = rbp->rbp_nbuffers;
 546                 int cr     = rbp->rbp_credits;
 547                 int mincr  = rbp->rbp_mincredits;
 548
 549                 s += snprintf(s, tmpstr + tmpsiz - s,
 550                               "%5d %5d %7d %7d\n",
 551                               npages, nbuf, cr, mincr);
 552                 LASSERT (tmpstr + tmpsiz - s > 0);
 553         }
 554
 555         LNET_UNLOCK();
 556
 557         len = s - tmpstr;
 558
 559         if (pos >= min_t(int, len, strlen(tmpstr)))
 560                 rc = 0;
 561         else
 562                 rc = cfs_trace_copyout_string(buffer, nob,
 563                                               tmpstr + pos, NULL);
 564
 565         LIBCFS_FREE(tmpstr, tmpsiz);
 566         return rc;
 567 }
 568
 569 DECLARE_PROC_HANDLER(proc_lnet_buffers);
 570
 571 int LL_PROC_PROTO(proc_lnet_nis)
 572 {
 573         int        rc = 0;
 574         char      *tmpstr;
 575         char      *s;
 576         const int  tmpsiz = 256;
 577         int        len;
 578
 579         DECLARE_LL_PROC_PPOS_DECL;
 580
 581         LASSERT (!write);
 582
 583         if (*lenp == 0)
 584                 return 0;
 585
 586         LIBCFS_ALLOC(tmpstr, tmpsiz);
 587         if (tmpstr == NULL)
 588                 return -ENOMEM;
 589
 590         s = tmpstr; /* points to current position in tmpstr[] */
 591
 592         if (*ppos == 0) {
 593                 s += snprintf(s, tmpstr + tmpsiz - s,
 594                               "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 595                               "nid", "status", "alive", "refs", "peer",
 596                               "rtr", "max", "tx", "min");
 597                 LASSERT (tmpstr + tmpsiz - s > 0);
 598         } else {
 599                 cfs_list_t        *n;
 600                 lnet_ni_t         *ni   = NULL;
 601                 int                skip = *ppos - 1;
 602
 603                 LNET_LOCK();
 604
 605                 n = the_lnet.ln_nis.next;
 606
 607                 while (n != &the_lnet.ln_nis) {
 608                         lnet_ni_t *a_ni = cfs_list_entry(n, lnet_ni_t, ni_list);
 609
 610                         if (skip == 0) {
 611                                 ni = a_ni;
 612                                 break;
 613                         }
 614
 615                         skip--;
 616                         n = n->next;
 617                 }
 618
 619                 if (ni != NULL) {
 620                         cfs_time_t now = cfs_time_current();
 621                         int        last_alive = -1;
 622                         int        maxtxcr = ni->ni_maxtxcredits;
 623                         int        txcr = ni->ni_txcredits;
 624                         int        mintxcr = ni->ni_mintxcredits;
 625                         int        npeertxcr = ni->ni_peertxcredits;
 626                         int        npeerrtrcr = ni->ni_peerrtrcredits;
 627                         lnet_nid_t nid = ni->ni_nid;
 628                         int        nref = ni->ni_refcount;
 629                         char      *stat;
 630
 631                         if (the_lnet.ln_routing)
 632                                 last_alive = cfs_duration_sec(cfs_time_sub(now,
 633                                                             ni->ni_last_alive));
 634                         if (ni->ni_lnd->lnd_type == LOLND)  /* @lo forever alive */
 635                                 last_alive = 0;
 636
 637                         LASSERT (ni->ni_status != NULL);
 638                         stat = (ni->ni_status->ns_status == LNET_NI_STATUS_UP) ?
 639                                                                   "up" : "down";
 640
 641                         s += snprintf(s, tmpstr + tmpsiz - s,
 642                                       "%-24s %6s %5d %4d %4d %4d %5d %5d %5d\n",
 643                                       libcfs_nid2str(nid), stat, last_alive, nref,
 644                                       npeertxcr, npeerrtrcr, maxtxcr,
 645                                       txcr, mintxcr);
 646                         LASSERT (tmpstr + tmpsiz - s > 0);
 647                 }
 648
 649                 LNET_UNLOCK();
 650         }
 651
 652         len = s - tmpstr;     /* how many bytes was written */
 653
 654         if (len > *lenp) {    /* linux-supplied buffer is too small */
 655                 rc = -EINVAL;
 656         } else if (len > 0) { /* wrote something */
 657                 if (cfs_copy_to_user(buffer, tmpstr, len))
 658                         rc = -EFAULT;
 659                 else
 660                         *ppos += 1;
 661         }
 662
 663         LIBCFS_FREE(tmpstr, tmpsiz);
 664
 665         if (rc == 0)
 666                 *lenp = len;
 667
 668         return rc;
 669 }
 670
 671 static cfs_sysctl_table_t lnet_table[] = {
 672         /*
 673          * NB No .strategy entries have been provided since sysctl(8) prefers
 674          * to go via /proc for portability.
 675          */
 676         {
 677                 .ctl_name = PSDEV_LNET_STATS,
 678                 .procname = "stats",
 679                 .mode     = 0644,
 680                 .proc_handler = &proc_lnet_stats,
 681         },
 682         {
 683                 .ctl_name = PSDEV_LNET_ROUTES,
 684                 .procname = "routes",
 685                 .mode     = 0444,
 686                 .proc_handler = &proc_lnet_routes,
 687         },
 688         {
 689                 .ctl_name = PSDEV_LNET_ROUTERS,
 690                 .procname = "routers",
 691                 .mode     = 0444,
 692                 .proc_handler = &proc_lnet_routers,
 693         },
 694         {
 695                 .ctl_name = PSDEV_LNET_PEERS,
 696                 .procname = "peers",
 697                 .mode     = 0444,
 698                 .proc_handler = &proc_lnet_peers,
 699         },
 700         {
 701                 .ctl_name = PSDEV_LNET_PEERS,
 702                 .procname = "buffers",
 703                 .mode     = 0444,
 704                 .proc_handler = &proc_lnet_buffers,
 705         },
 706         {
 707                 .ctl_name = PSDEV_LNET_NIS,
 708                 .procname = "nis",
 709                 .mode     = 0444,
 710                 .proc_handler = &proc_lnet_nis,
 711         },
 712         {0}
 713 };
 714
 715 static cfs_sysctl_table_t top_table[] = {
 716         {
 717                 .ctl_name = CTL_LNET,
 718                 .procname = "lnet",
 719                 .mode     = 0555,
 720                 .data     = NULL,
 721                 .maxlen   = 0,
 722                 .child    = lnet_table,
 723         },
 724         {
 725                 .ctl_name = 0
 726         }
 727 };
 728
 729 void
 730 lnet_proc_init(void)
 731 {
 732 #ifdef CONFIG_SYSCTL
 733         if (lnet_table_header == NULL)
 734                 lnet_table_header = cfs_register_sysctl_table(top_table, 0);
 735 #endif
 736 }
 737
 738 void
 739 lnet_proc_fini(void)
 740 {
 741 #ifdef CONFIG_SYSCTL
 742         if (lnet_table_header != NULL)
 743                 cfs_unregister_sysctl_table(lnet_table_header);
 744
 745         lnet_table_header = NULL;
 746 #endif
 747 }
 748
 749 #else
 750
 751 void
 752 lnet_proc_init(void)
 753 {
 754 }
 755
 756 void
 757 lnet_proc_fini(void)
 758 {
 759 }
 760
 761 #endif