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. You might need to update sanity test 215
  31  * if any file format is changed. */
  32
  33 static cfs_sysctl_table_header_t *lnet_table_header = NULL;
  34
  35 #ifndef HAVE_SYSCTL_UNNUMBERED
  36 #define CTL_LNET         (0x100)
  37 enum {
  38         PSDEV_LNET_STATS = 100,
  39         PSDEV_LNET_ROUTES,
  40         PSDEV_LNET_ROUTERS,
  41         PSDEV_LNET_PEERS,
  42         PSDEV_LNET_BUFFERS,
  43         PSDEV_LNET_NIS,
  44 };
  45 #else
  46 #define CTL_LNET           CTL_UNNUMBERED
  47 #define PSDEV_LNET_STATS   CTL_UNNUMBERED
  48 #define PSDEV_LNET_ROUTES  CTL_UNNUMBERED
  49 #define PSDEV_LNET_ROUTERS CTL_UNNUMBERED
  50 #define PSDEV_LNET_PEERS   CTL_UNNUMBERED
  51 #define PSDEV_LNET_BUFFERS CTL_UNNUMBERED
  52 #define PSDEV_LNET_NIS     CTL_UNNUMBERED
  53 #endif
  54
  55 /*
  56  * NB: we don't use the highest bit of *ppos because it's signed;
  57  *     next 9 bits is used to stash idx (assuming that
  58  *     LNET_PEER_HASHSIZE < 512)
  59  */
  60 #define LNET_LOFFT_BITS        (sizeof(loff_t) * 8)
  61 #define LNET_VERSION_BITS      MAX(((MIN(LNET_LOFFT_BITS, 64)) / 4), 8)
  62 #define LNET_PHASH_IDX_BITS    9
  63 #define LNET_PHASH_NUM_BITS    (LNET_LOFFT_BITS - 1 -\
  64                                 LNET_VERSION_BITS - LNET_PHASH_IDX_BITS)
  65 #define LNET_PHASH_BITS        (LNET_PHASH_IDX_BITS + LNET_PHASH_NUM_BITS)
  66
  67 #define LNET_VERSION_BITMASK   ((1ULL << LNET_VERSION_BITS) - 1)
  68 #define LNET_PHASH_IDX_BITMASK ((1ULL << LNET_PHASH_IDX_BITS) - 1)
  69 #define LNET_PHASH_NUM_BITMASK ((1ULL << LNET_PHASH_NUM_BITS) - 1)
  70
  71 #define LNET_VERSION_MASK      (LNET_VERSION_BITMASK << LNET_PHASH_BITS)
  72 #define LNET_PHASH_IDX_MASK    (LNET_PHASH_IDX_BITMASK << LNET_PHASH_NUM_BITS)
  73 #define LNET_PHASH_NUM_MASK    (LNET_PHASH_NUM_BITMASK)
  74
  75 #define LNET_VERSION_GET(pos)   (int)(((pos) & LNET_VERSION_MASK) >> \
  76                                      LNET_PHASH_BITS)
  77 #define LNET_PHASH_IDX_GET(pos) (int)(((pos) & LNET_PHASH_IDX_MASK) >> \
  78                                       LNET_PHASH_NUM_BITS)
  79 #define LNET_PHASH_NUM_GET(pos) (int)((pos) & LNET_PHASH_NUM_MASK)
  80 #define LNET_VERSION_VALID_MASK(ver) \
  81                                 (unsigned int)((ver) & \
  82                                  LNET_VERSION_BITMASK)
  83 #define LNET_PHASH_POS_MAKE(ver, idx, num)                                     \
  84                                 (((((loff_t)(ver)) & LNET_VERSION_BITMASK) <<  \
  85                                    LNET_PHASH_BITS) |                          \
  86                                  ((((loff_t)(idx)) & LNET_PHASH_IDX_BITMASK) <<\
  87                                    LNET_PHASH_NUM_BITS) |                      \
  88                                  ((num) & LNET_PHASH_NUM_BITMASK))
  89
  90 static int __proc_lnet_stats(void *data, int write,
  91                              loff_t pos, void *buffer, int nob)
  92 {
  93         int              rc;
  94         lnet_counters_t *ctrs;
  95         int              len;
  96         char            *tmpstr;
  97         const int        tmpsiz = 256; /* 7 %u and 4 LPU64 */
  98
  99         if (write) {
 100                 LNET_LOCK();
 101                 memset(&the_lnet.ln_counters, 0, sizeof(the_lnet.ln_counters));
 102                 LNET_UNLOCK();
 103                 return 0;
 104         }
 105
 106         /* read */
 107
 108         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
 109         if (ctrs == NULL)
 110                 return -ENOMEM;
 111
 112         LIBCFS_ALLOC(tmpstr, tmpsiz);
 113         if (tmpstr == NULL) {
 114                 LIBCFS_FREE(ctrs, sizeof(*ctrs));
 115                 return -ENOMEM;
 116         }
 117
 118         LNET_LOCK();
 119         *ctrs = the_lnet.ln_counters;
 120         LNET_UNLOCK();
 121
 122         len = snprintf(tmpstr, tmpsiz,
 123                        "%u %u %u %u %u %u %u "LPU64" "LPU64" "
 124                        LPU64" "LPU64,
 125                        ctrs->msgs_alloc, ctrs->msgs_max,
 126                        ctrs->errors,
 127                        ctrs->send_count, ctrs->recv_count,
 128                        ctrs->route_count, ctrs->drop_count,
 129                        ctrs->send_length, ctrs->recv_length,
 130                        ctrs->route_length, ctrs->drop_length);
 131
 132         if (pos >= min_t(int, len, strlen(tmpstr)))
 133                 rc = 0;
 134         else
 135                 rc = cfs_trace_copyout_string(buffer, nob,
 136                                               tmpstr + pos, "\n");
 137
 138         LIBCFS_FREE(tmpstr, tmpsiz);
 139         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 140         return rc;
 141 }
 142
 143 DECLARE_PROC_HANDLER(proc_lnet_stats);
 144
 145 int LL_PROC_PROTO(proc_lnet_routes)
 146 {
 147         int        rc     = 0;
 148         char      *tmpstr;
 149         char      *s;
 150         const int  tmpsiz = 256;
 151         int        len;
 152         int        ver;
 153         int        num;
 154
 155         DECLARE_LL_PROC_PPOS_DECL;
 156
 157         num = LNET_PHASH_NUM_GET(*ppos);
 158         ver = LNET_VERSION_GET(*ppos);
 159
 160         LASSERT (!write);
 161
 162         if (*lenp == 0)
 163                 return 0;
 164
 165         LIBCFS_ALLOC(tmpstr, tmpsiz);
 166         if (tmpstr == NULL)
 167                 return -ENOMEM;
 168
 169         s = tmpstr; /* points to current position in tmpstr[] */
 170
 171         if (*ppos == 0) {
 172                 s += snprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 173                               the_lnet.ln_routing ? "enabled" : "disabled");
 174                 LASSERT (tmpstr + tmpsiz - s > 0);
 175
 176                 s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %7s %s\n",
 177                               "net", "hops", "state", "router");
 178                 LASSERT (tmpstr + tmpsiz - s > 0);
 179
 180                 LNET_LOCK();
 181                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 182                 LNET_UNLOCK();
 183                 *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 184         } else {
 185                 cfs_list_t        *n;
 186                 cfs_list_t        *r;
 187                 lnet_route_t      *route = NULL;
 188                 lnet_remotenet_t  *rnet  = NULL;
 189                 int                skip  = num - 1;
 190
 191                 LNET_LOCK();
 192
 193                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_remote_nets_version)) {
 194                         LNET_UNLOCK();
 195                         LIBCFS_FREE(tmpstr, tmpsiz);
 196                         return -ESTALE;
 197                 }
 198
 199                 n = the_lnet.ln_remote_nets.next;
 200
 201                 while (n != &the_lnet.ln_remote_nets && route == NULL) {
 202                         rnet = cfs_list_entry(n, lnet_remotenet_t, lrn_list);
 203
 204                         r = rnet->lrn_routes.next;
 205
 206                         while (r != &rnet->lrn_routes) {
 207                                 lnet_route_t *re =
 208                                         cfs_list_entry(r, lnet_route_t,
 209                                                        lr_list);
 210                                 if (skip == 0) {
 211                                         route = re;
 212                                         break;
 213                                 }
 214
 215                                 skip--;
 216                                 r = r->next;
 217                         }
 218
 219                         n = n->next;
 220                 }
 221
 222                 if (route != NULL) {
 223                         __u32        net   = rnet->lrn_net;
 224                         unsigned int hops  = route->lr_hops;
 225                         lnet_nid_t   nid   = route->lr_gateway->lp_nid;
 226                         int          alive = route->lr_gateway->lp_alive;
 227
 228                         s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4u %7s %s\n",
 229                                       libcfs_net2str(net), hops,
 230                                       alive ? "up" : "down", libcfs_nid2str(nid));
 231                         LASSERT (tmpstr + tmpsiz - s > 0);
 232                 }
 233
 234                 LNET_UNLOCK();
 235         }
 236
 237         len = s - tmpstr;     /* how many bytes was written */
 238
 239         if (len > *lenp) {    /* linux-supplied buffer is too small */
 240                 rc = -EINVAL;
 241         } else if (len > 0) { /* wrote something */
 242                 if (cfs_copy_to_user(buffer, tmpstr, len))
 243                         rc = -EFAULT;
 244                 else {
 245                         num += 1;
 246                         *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 247                 }
 248         }
 249
 250         LIBCFS_FREE(tmpstr, tmpsiz);
 251
 252         if (rc == 0)
 253                 *lenp = len;
 254
 255         return rc;
 256 }
 257
 258 int LL_PROC_PROTO(proc_lnet_routers)
 259 {
 260         int        rc = 0;
 261         char      *tmpstr;
 262         char      *s;
 263         const int  tmpsiz = 256;
 264         int        len;
 265         int        ver;
 266         int        num;
 267
 268         DECLARE_LL_PROC_PPOS_DECL;
 269
 270         num = LNET_PHASH_NUM_GET(*ppos);
 271         ver = LNET_VERSION_GET(*ppos);
 272
 273         LASSERT (!write);
 274
 275         if (*lenp == 0)
 276                 return 0;
 277
 278         LIBCFS_ALLOC(tmpstr, tmpsiz);
 279         if (tmpstr == NULL)
 280                 return -ENOMEM;
 281
 282         s = tmpstr; /* points to current position in tmpstr[] */
 283
 284         if (*ppos == 0) {
 285                 s += snprintf(s, tmpstr + tmpsiz - s,
 286                               "%-4s %7s %9s %6s %12s %9s %8s %7s %s\n",
 287                               "ref", "rtr_ref", "alive_cnt", "state", "last_ping",
 288                               "ping_sent", "deadline", "down_ni", "router");
 289                 LASSERT (tmpstr + tmpsiz - s > 0);
 290
 291                 LNET_LOCK();
 292                 ver = (unsigned int)the_lnet.ln_routers_version;
 293                 LNET_UNLOCK();
 294                 *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 295         } else {
 296                 cfs_list_t        *r;
 297                 lnet_peer_t       *peer = NULL;
 298                 int                skip = num - 1;
 299
 300                 LNET_LOCK();
 301
 302                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_routers_version)) {
 303                         LNET_UNLOCK();
 304                         LIBCFS_FREE(tmpstr, tmpsiz);
 305                         return -ESTALE;
 306                 }
 307
 308                 r = the_lnet.ln_routers.next;
 309
 310                 while (r != &the_lnet.ln_routers) {
 311                         lnet_peer_t *lp = cfs_list_entry(r, lnet_peer_t,
 312                                                          lp_rtr_list);
 313
 314                         if (skip == 0) {
 315                                 peer = lp;
 316                                 break;
 317                         }
 318
 319                         skip--;
 320                         r = r->next;
 321                 }
 322
 323                 if (peer != NULL) {
 324                         lnet_nid_t nid = peer->lp_nid;
 325                         cfs_time_t now = cfs_time_current();
 326                         cfs_time_t deadline = peer->lp_ping_deadline;
 327                         int nrefs     = peer->lp_refcount;
 328                         int nrtrrefs  = peer->lp_rtr_refcount;
 329                         int alive_cnt = peer->lp_alive_count;
 330                         int alive     = peer->lp_alive;
 331                         int pingsent  = !peer->lp_ping_notsent;
 332                         int last_ping = cfs_duration_sec(cfs_time_sub(now,
 333                                                      peer->lp_ping_timestamp));
 334                         int down_ni   = lnet_router_down_ni(peer,
 335                                                     LNET_NIDNET(LNET_NID_ANY));
 336
 337                         if (deadline == 0)
 338                                 s += snprintf(s, tmpstr + tmpsiz - s,
 339                                               "%-4d %7d %9d %6s %12d %9d %8s %7d %s\n",
 340                                               nrefs, nrtrrefs, alive_cnt,
 341                                               alive ? "up" : "down", last_ping,
 342                                               pingsent, "NA", down_ni,
 343                                               libcfs_nid2str(nid));
 344                         else
 345                                 s += snprintf(s, tmpstr + tmpsiz - s,
 346                                               "%-4d %7d %9d %6s %12d %9d %8lu %7d %s\n",
 347                                               nrefs, nrtrrefs, alive_cnt,
 348                                               alive ? "up" : "down", last_ping,
 349                                               pingsent,
 350                                               cfs_duration_sec(cfs_time_sub(deadline, now)),
 351                                               down_ni, libcfs_nid2str(nid));
 352                         LASSERT (tmpstr + tmpsiz - s > 0);
 353                 }
 354
 355                 LNET_UNLOCK();
 356         }
 357
 358         len = s - tmpstr;     /* how many bytes was written */
 359
 360         if (len > *lenp) {    /* linux-supplied buffer is too small */
 361                 rc = -EINVAL;
 362         } else if (len > 0) { /* wrote something */
 363                 if (cfs_copy_to_user(buffer, tmpstr, len))
 364                         rc = -EFAULT;
 365                 else {
 366                         num += 1;
 367                         *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 368                 }
 369         }
 370
 371         LIBCFS_FREE(tmpstr, tmpsiz);
 372
 373         if (rc == 0)
 374                 *lenp = len;
 375
 376         return rc;
 377 }
 378
 379 int LL_PROC_PROTO(proc_lnet_peers)
 380 {
 381         int        rc = 0;
 382         char      *tmpstr;
 383         char      *s;
 384         const int  tmpsiz      = 256;
 385         int        len;
 386         int        ver;
 387         int        idx;
 388         int        num;
 389
 390         DECLARE_LL_PROC_PPOS_DECL;
 391
 392         idx = LNET_PHASH_IDX_GET(*ppos);
 393         num = LNET_PHASH_NUM_GET(*ppos);
 394         ver = LNET_VERSION_GET(*ppos);
 395
 396         CLASSERT ((1ULL << LNET_PHASH_BITS) > LNET_PEER_HASHSIZE);
 397
 398         LASSERT (!write);
 399
 400         if (*lenp == 0)
 401                 return 0;
 402
 403         LIBCFS_ALLOC(tmpstr, tmpsiz);
 404         if (tmpstr == NULL)
 405                 return -ENOMEM;
 406
 407         s = tmpstr; /* points to current position in tmpstr[] */
 408
 409         if (*ppos == 0) {
 410                 s += snprintf(s, tmpstr + tmpsiz - s,
 411                               "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 412                               "nid", "refs", "state", "last", "max",
 413                               "rtr", "min", "tx", "min", "queue");
 414                 LASSERT (tmpstr + tmpsiz - s > 0);
 415
 416                 LNET_LOCK();
 417                 ver = (unsigned int)the_lnet.ln_peertable_version;
 418                 LNET_UNLOCK();
 419                 *ppos = LNET_PHASH_POS_MAKE(ver, idx, num);
 420
 421                 num++;
 422         } else {
 423                 cfs_list_t        *p    = NULL;
 424                 lnet_peer_t       *peer = NULL;
 425                 int                skip = num - 1;
 426
 427                 LNET_LOCK();
 428
 429                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_peertable_version)) {
 430                         LNET_UNLOCK();
 431                         LIBCFS_FREE(tmpstr, tmpsiz);
 432                         return -ESTALE;
 433                 }
 434
 435                 while (idx < LNET_PEER_HASHSIZE) {
 436                         if (p == NULL)
 437                                 p = the_lnet.ln_peer_hash[idx].next;
 438
 439                         while (p != &the_lnet.ln_peer_hash[idx]) {
 440                                 lnet_peer_t *lp = cfs_list_entry(p, lnet_peer_t,
 441                                                                  lp_hashlist);
 442                                 if (skip == 0) {
 443                                         peer = lp;
 444
 445                                         /* minor optimization: start from idx+1
 446                                          * on next iteration if we've just
 447                                          * drained lp_hashlist */
 448                                         if (lp->lp_hashlist.next ==
 449                                             &the_lnet.ln_peer_hash[idx]) {
 450                                                 num = 1;
 451                                                 idx++;
 452                                         } else {
 453                                                 num++;
 454                                         }
 455
 456                                         break;
 457                                 }
 458
 459                                 skip--;
 460                                 p = lp->lp_hashlist.next;
 461                         }
 462
 463                         if (peer != NULL)
 464                                 break;
 465
 466                         p = NULL;
 467                         num = 1;
 468                         idx++;
 469                 }
 470
 471                 if (peer != NULL) {
 472                         lnet_nid_t nid       = peer->lp_nid;
 473                         int        nrefs     = peer->lp_refcount;
 474                         int        lastalive = -1;
 475                         char      *aliveness = "NA";
 476                         int        maxcr     = peer->lp_ni->ni_peertxcredits;
 477                         int        txcr      = peer->lp_txcredits;
 478                         int        mintxcr   = peer->lp_mintxcredits;
 479                         int        rtrcr     = peer->lp_rtrcredits;
 480                         int        minrtrcr  = peer->lp_minrtrcredits;
 481                         int        txqnob    = peer->lp_txqnob;
 482
 483                         if (lnet_isrouter(peer) ||
 484                             lnet_peer_aliveness_enabled(peer))
 485                                 aliveness = peer->lp_alive ? "up" : "down";
 486
 487                         if (lnet_peer_aliveness_enabled(peer)) {
 488                                 cfs_time_t     now = cfs_time_current();
 489                                 cfs_duration_t delta;
 490
 491                                 delta = cfs_time_sub(now, peer->lp_last_alive);
 492                                 lastalive = cfs_duration_sec(delta);
 493
 494                                 /* No need to mess up peers contents with
 495                                  * arbitrarily long integers - it suffices to
 496                                  * know that lastalive is more than 10000s old
 497                                  */
 498                                 if (lastalive >= 10000)
 499                                         lastalive = 9999;
 500                         }
 501
 502                         s += snprintf(s, tmpstr + tmpsiz - s,
 503                                       "%-24s %4d %5s %5d %5d %5d %5d %5d %5d %d\n",
 504                                       libcfs_nid2str(nid), nrefs, aliveness,
 505                                       lastalive, maxcr, rtrcr, minrtrcr, txcr,
 506                                       mintxcr, txqnob);
 507                         LASSERT (tmpstr + tmpsiz - s > 0);
 508                 }
 509
 510                 LNET_UNLOCK();
 511         }
 512
 513         len = s - tmpstr;     /* how many bytes was written */
 514
 515         if (len > *lenp) {    /* linux-supplied buffer is too small */
 516                 rc = -EINVAL;
 517         } else if (len > 0) { /* wrote something */
 518                 if (cfs_copy_to_user(buffer, tmpstr, len))
 519                         rc = -EFAULT;
 520                 else
 521                         *ppos = LNET_PHASH_POS_MAKE(ver, idx, num);
 522         }
 523
 524         LIBCFS_FREE(tmpstr, tmpsiz);
 525
 526         if (rc == 0)
 527                 *lenp = len;
 528
 529         return rc;
 530 }
 531
 532 static int __proc_lnet_buffers(void *data, int write,
 533                                loff_t pos, void *buffer, int nob)
 534 {
 535
 536         int              rc;
 537         int              len;
 538         char            *s;
 539         char            *tmpstr;
 540         const int        tmpsiz = 64 * (LNET_NRBPOOLS + 1); /* (4 %d) * 4 */
 541         int              idx;
 542
 543         LASSERT (!write);
 544
 545         LIBCFS_ALLOC(tmpstr, tmpsiz);
 546         if (tmpstr == NULL)
 547                 return -ENOMEM;
 548
 549         s = tmpstr; /* points to current position in tmpstr[] */
 550
 551         s += snprintf(s, tmpstr + tmpsiz - s,
 552                       "%5s %5s %7s %7s\n",
 553                       "pages", "count", "credits", "min");
 554         LASSERT (tmpstr + tmpsiz - s > 0);
 555
 556         LNET_LOCK();
 557
 558         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 559                 lnet_rtrbufpool_t *rbp = &the_lnet.ln_rtrpools[idx];
 560
 561                 int npages = rbp->rbp_npages;
 562                 int nbuf   = rbp->rbp_nbuffers;
 563                 int cr     = rbp->rbp_credits;
 564                 int mincr  = rbp->rbp_mincredits;
 565
 566                 s += snprintf(s, tmpstr + tmpsiz - s,
 567                               "%5d %5d %7d %7d\n",
 568                               npages, nbuf, cr, mincr);
 569                 LASSERT (tmpstr + tmpsiz - s > 0);
 570         }
 571
 572         LNET_UNLOCK();
 573
 574         len = s - tmpstr;
 575
 576         if (pos >= min_t(int, len, strlen(tmpstr)))
 577                 rc = 0;
 578         else
 579                 rc = cfs_trace_copyout_string(buffer, nob,
 580                                               tmpstr + pos, NULL);
 581
 582         LIBCFS_FREE(tmpstr, tmpsiz);
 583         return rc;
 584 }
 585
 586 DECLARE_PROC_HANDLER(proc_lnet_buffers);
 587
 588 int LL_PROC_PROTO(proc_lnet_nis)
 589 {
 590         int        rc = 0;
 591         char      *tmpstr;
 592         char      *s;
 593         const int  tmpsiz = 256;
 594         int        len;
 595
 596         DECLARE_LL_PROC_PPOS_DECL;
 597
 598         LASSERT (!write);
 599
 600         if (*lenp == 0)
 601                 return 0;
 602
 603         LIBCFS_ALLOC(tmpstr, tmpsiz);
 604         if (tmpstr == NULL)
 605                 return -ENOMEM;
 606
 607         s = tmpstr; /* points to current position in tmpstr[] */
 608
 609         if (*ppos == 0) {
 610                 s += snprintf(s, tmpstr + tmpsiz - s,
 611                               "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 612                               "nid", "status", "alive", "refs", "peer",
 613                               "rtr", "max", "tx", "min");
 614                 LASSERT (tmpstr + tmpsiz - s > 0);
 615         } else {
 616                 cfs_list_t        *n;
 617                 lnet_ni_t         *ni   = NULL;
 618                 int                skip = *ppos - 1;
 619
 620                 LNET_LOCK();
 621
 622                 n = the_lnet.ln_nis.next;
 623
 624                 while (n != &the_lnet.ln_nis) {
 625                         lnet_ni_t *a_ni = cfs_list_entry(n, lnet_ni_t, ni_list);
 626
 627                         if (skip == 0) {
 628                                 ni = a_ni;
 629                                 break;
 630                         }
 631
 632                         skip--;
 633                         n = n->next;
 634                 }
 635
 636                 if (ni != NULL) {
 637                         cfs_time_t now = cfs_time_current();
 638                         int        last_alive = -1;
 639                         int        maxtxcr = ni->ni_maxtxcredits;
 640                         int        txcr = ni->ni_txcredits;
 641                         int        mintxcr = ni->ni_mintxcredits;
 642                         int        npeertxcr = ni->ni_peertxcredits;
 643                         int        npeerrtrcr = ni->ni_peerrtrcredits;
 644                         lnet_nid_t nid = ni->ni_nid;
 645                         int        nref = ni->ni_refcount;
 646                         char      *stat;
 647
 648                         if (the_lnet.ln_routing)
 649                                 last_alive = cfs_duration_sec(cfs_time_sub(now,
 650                                                             ni->ni_last_alive));
 651                         if (ni->ni_lnd->lnd_type == LOLND)  /* @lo forever alive */
 652                                 last_alive = 0;
 653
 654                         LASSERT (ni->ni_status != NULL);
 655                         stat = (ni->ni_status->ns_status == LNET_NI_STATUS_UP) ?
 656                                                                   "up" : "down";
 657
 658                         s += snprintf(s, tmpstr + tmpsiz - s,
 659                                       "%-24s %6s %5d %4d %4d %4d %5d %5d %5d\n",
 660                                       libcfs_nid2str(nid), stat, last_alive, nref,
 661                                       npeertxcr, npeerrtrcr, maxtxcr,
 662                                       txcr, mintxcr);
 663                         LASSERT (tmpstr + tmpsiz - s > 0);
 664                 }
 665
 666                 LNET_UNLOCK();
 667         }
 668
 669         len = s - tmpstr;     /* how many bytes was written */
 670
 671         if (len > *lenp) {    /* linux-supplied buffer is too small */
 672                 rc = -EINVAL;
 673         } else if (len > 0) { /* wrote something */
 674                 if (cfs_copy_to_user(buffer, tmpstr, len))
 675                         rc = -EFAULT;
 676                 else
 677                         *ppos += 1;
 678         }
 679
 680         LIBCFS_FREE(tmpstr, tmpsiz);
 681
 682         if (rc == 0)
 683                 *lenp = len;
 684
 685         return rc;
 686 }
 687
 688 static cfs_sysctl_table_t lnet_table[] = {
 689         /*
 690          * NB No .strategy entries have been provided since sysctl(8) prefers
 691          * to go via /proc for portability.
 692          */
 693         {
 694                 .ctl_name = PSDEV_LNET_STATS,
 695                 .procname = "stats",
 696                 .mode     = 0644,
 697                 .proc_handler = &proc_lnet_stats,
 698         },
 699         {
 700                 .ctl_name = PSDEV_LNET_ROUTES,
 701                 .procname = "routes",
 702                 .mode     = 0444,
 703                 .proc_handler = &proc_lnet_routes,
 704         },
 705         {
 706                 .ctl_name = PSDEV_LNET_ROUTERS,
 707                 .procname = "routers",
 708                 .mode     = 0444,
 709                 .proc_handler = &proc_lnet_routers,
 710         },
 711         {
 712                 .ctl_name = PSDEV_LNET_PEERS,
 713                 .procname = "peers",
 714                 .mode     = 0444,
 715                 .proc_handler = &proc_lnet_peers,
 716         },
 717         {
 718                 .ctl_name = PSDEV_LNET_PEERS,
 719                 .procname = "buffers",
 720                 .mode     = 0444,
 721                 .proc_handler = &proc_lnet_buffers,
 722         },
 723         {
 724                 .ctl_name = PSDEV_LNET_NIS,
 725                 .procname = "nis",
 726                 .mode     = 0444,
 727                 .proc_handler = &proc_lnet_nis,
 728         },
 729         {0}
 730 };
 731
 732 static cfs_sysctl_table_t top_table[] = {
 733         {
 734                 .ctl_name = CTL_LNET,
 735                 .procname = "lnet",
 736                 .mode     = 0555,
 737                 .data     = NULL,
 738                 .maxlen   = 0,
 739                 .child    = lnet_table,
 740         },
 741         {
 742                 .ctl_name = 0
 743         }
 744 };
 745
 746 void
 747 lnet_proc_init(void)
 748 {
 749 #ifdef CONFIG_SYSCTL
 750         if (lnet_table_header == NULL)
 751                 lnet_table_header = cfs_register_sysctl_table(top_table, 0);
 752 #endif
 753 }
 754
 755 void
 756 lnet_proc_fini(void)
 757 {
 758 #ifdef CONFIG_SYSCTL
 759         if (lnet_table_header != NULL)
 760                 cfs_unregister_sysctl_table(lnet_table_header);
 761
 762         lnet_table_header = NULL;
 763 #endif
 764 }
 765
 766 #else
 767
 768 void
 769 lnet_proc_init(void)
 770 {
 771 }
 772
 773 void
 774 lnet_proc_fini(void)
 775 {
 776 }
 777
 778 #endif