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  2008 Sun Microsystems, Inc. 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 static int __proc_lnet_stats(void *data, int write,
  55                              loff_t pos, void *buffer, int nob)
  56 {
  57         int              rc;
  58         lnet_counters_t *ctrs;
  59         int              len;
  60         char            *tmpstr;
  61         const int        tmpsiz = 256; /* 7 %u and 4 LPU64 */
  62
  63         if (write) {
  64                 LNET_LOCK();
  65                 memset(&the_lnet.ln_counters, 0, sizeof(the_lnet.ln_counters));
  66                 LNET_UNLOCK();
  67                 return 0;
  68         }
  69
  70         /* read */
  71
  72         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
  73         if (ctrs == NULL)
  74                 return -ENOMEM;
  75
  76         LIBCFS_ALLOC(tmpstr, tmpsiz);
  77         if (tmpstr == NULL) {
  78                 LIBCFS_FREE(ctrs, sizeof(*ctrs));
  79                 return -ENOMEM;
  80         }
  81
  82         LNET_LOCK();
  83         *ctrs = the_lnet.ln_counters;
  84         LNET_UNLOCK();
  85
  86         len = snprintf(tmpstr, tmpsiz,
  87                        "%u %u %u %u %u %u %u "LPU64" "LPU64" "
  88                        LPU64" "LPU64,
  89                        ctrs->msgs_alloc, ctrs->msgs_max,
  90                        ctrs->errors,
  91                        ctrs->send_count, ctrs->recv_count,
  92                        ctrs->route_count, ctrs->drop_count,
  93                        ctrs->send_length, ctrs->recv_length,
  94                        ctrs->route_length, ctrs->drop_length);
  95
  96         if (pos >= min_t(int, len, strlen(tmpstr)))
  97                 rc = 0;
  98         else
  99                 rc = cfs_trace_copyout_string(buffer, nob,
 100                                               tmpstr + pos, "\n");
 101
 102         LIBCFS_FREE(tmpstr, tmpsiz);
 103         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 104         return rc;
 105 }
 106
 107 DECLARE_PROC_HANDLER(proc_lnet_stats);
 108
 109 int LL_PROC_PROTO(proc_lnet_routes)
 110 {
 111         int        rc     = 0;
 112         char      *tmpstr;
 113         char      *s;
 114         const int  tmpsiz = 256;
 115         int        len;
 116         int       *ver_p  = (unsigned int *)(&filp->private_data);
 117
 118         DECLARE_LL_PROC_PPOS_DECL;
 119
 120         LASSERT (!write);
 121
 122         if (*lenp == 0)
 123                 return 0;
 124
 125         LIBCFS_ALLOC(tmpstr, tmpsiz);
 126         if (tmpstr == NULL)
 127                 return -ENOMEM;
 128
 129         s = tmpstr; /* points to current position in tmpstr[] */
 130
 131         if (*ppos == 0) {
 132                 s += snprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 133                               the_lnet.ln_routing ? "enabled" : "disabled");
 134                 LASSERT (tmpstr + tmpsiz - s > 0);
 135
 136                 s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %7s %s\n",
 137                               "net", "hops", "state", "router");
 138                 LASSERT (tmpstr + tmpsiz - s > 0);
 139
 140                 LNET_LOCK();
 141                 *ver_p = (unsigned int)the_lnet.ln_remote_nets_version;
 142                 LNET_UNLOCK();
 143         } else {
 144                 cfs_list_t        *n;
 145                 cfs_list_t        *r;
 146                 lnet_route_t      *route = NULL;
 147                 lnet_remotenet_t  *rnet  = NULL;
 148                 int                skip  = *ppos - 1;
 149
 150                 LNET_LOCK();
 151
 152                 if (*ver_p != (unsigned int)the_lnet.ln_remote_nets_version) {
 153                         LNET_UNLOCK();
 154                         LIBCFS_FREE(tmpstr, tmpsiz);
 155                         return -ESTALE;
 156                 }
 157
 158                 n = the_lnet.ln_remote_nets.next;
 159
 160                 while (n != &the_lnet.ln_remote_nets && route == NULL) {
 161                         rnet = cfs_list_entry(n, lnet_remotenet_t, lrn_list);
 162
 163                         r = rnet->lrn_routes.next;
 164
 165                         while (r != &rnet->lrn_routes) {
 166                                 lnet_route_t *re =
 167                                         cfs_list_entry(r, lnet_route_t,
 168                                                        lr_list);
 169                                 if (skip == 0) {
 170                                         route = re;
 171                                         break;
 172                                 }
 173
 174                                 skip--;
 175                                 r = r->next;
 176                         }
 177
 178                         n = n->next;
 179                 }
 180
 181                 if (route != NULL) {
 182                         __u32        net   = rnet->lrn_net;
 183                         unsigned int hops  = route->lr_hops;
 184                         lnet_nid_t   nid   = route->lr_gateway->lp_nid;
 185                         int          alive = route->lr_gateway->lp_alive;
 186
 187                         s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4u %7s %s\n",
 188                                       libcfs_net2str(net), hops,
 189                                       alive ? "up" : "down", libcfs_nid2str(nid));
 190                         LASSERT (tmpstr + tmpsiz - s > 0);
 191                 }
 192
 193                 LNET_UNLOCK();
 194         }
 195
 196         len = s - tmpstr;     /* how many bytes was written */
 197
 198         if (len > *lenp) {    /* linux-supplied buffer is too small */
 199                 rc = -EINVAL;
 200         } else if (len > 0) { /* wrote something */
 201                 if (cfs_copy_to_user(buffer, tmpstr, len))
 202                         rc = -EFAULT;
 203                 else
 204                         *ppos += 1;
 205         }
 206
 207         LIBCFS_FREE(tmpstr, tmpsiz);
 208
 209         if (rc == 0)
 210                 *lenp = len;
 211
 212         return rc;
 213 }
 214
 215 int LL_PROC_PROTO(proc_lnet_routers)
 216 {
 217         int        rc = 0;
 218         char      *tmpstr;
 219         char      *s;
 220         const int  tmpsiz = 256;
 221         int        len;
 222         int       *ver_p = (unsigned int *)(&filp->private_data);
 223
 224         DECLARE_LL_PROC_PPOS_DECL;
 225
 226         LASSERT (!write);
 227
 228         if (*lenp == 0)
 229                 return 0;
 230
 231         LIBCFS_ALLOC(tmpstr, tmpsiz);
 232         if (tmpstr == NULL)
 233                 return -ENOMEM;
 234
 235         s = tmpstr; /* points to current position in tmpstr[] */
 236
 237         if (*ppos == 0) {
 238                 s += snprintf(s, tmpstr + tmpsiz - s,
 239                               "%-4s %7s %9s %6s %12s %9s %8s %7s %s\n",
 240                               "ref", "rtr_ref", "alive_cnt", "state", "last_ping",
 241                               "ping_sent", "deadline", "down_ni", "router");
 242                 LASSERT (tmpstr + tmpsiz - s > 0);
 243
 244                 LNET_LOCK();
 245                 *ver_p = (unsigned int)the_lnet.ln_routers_version;
 246                 LNET_UNLOCK();
 247         } else {
 248                 cfs_list_t        *r;
 249                 lnet_peer_t       *peer = NULL;
 250                 int                skip = *ppos - 1;
 251
 252                 LNET_LOCK();
 253
 254                 if (*ver_p != (unsigned int)the_lnet.ln_routers_version) {
 255                         LNET_UNLOCK();
 256                         LIBCFS_FREE(tmpstr, tmpsiz);
 257                         return -ESTALE;
 258                 }
 259
 260                 r = the_lnet.ln_routers.next;
 261
 262                 while (r != &the_lnet.ln_routers) {
 263                         lnet_peer_t *lp = cfs_list_entry(r, lnet_peer_t,
 264                                                          lp_rtr_list);
 265
 266                         if (skip == 0) {
 267                                 peer = lp;
 268                                 break;
 269                         }
 270
 271                         skip--;
 272                         r = r->next;
 273                 }
 274
 275                 if (peer != NULL) {
 276                         lnet_nid_t nid = peer->lp_nid;
 277                         cfs_time_t now = cfs_time_current();
 278                         cfs_time_t deadline = peer->lp_ping_deadline;
 279                         int nrefs     = peer->lp_refcount;
 280                         int nrtrrefs  = peer->lp_rtr_refcount;
 281                         int alive_cnt = peer->lp_alive_count;
 282                         int alive     = peer->lp_alive;
 283                         int pingsent  = !peer->lp_ping_notsent;
 284                         int last_ping = cfs_duration_sec(cfs_time_sub(now,
 285                                                      peer->lp_ping_timestamp));
 286                         int down_ni   = lnet_router_down_ni(peer,
 287                                                     LNET_NIDNET(LNET_NID_ANY));
 288
 289                         if (deadline == 0)
 290                                 s += snprintf(s, tmpstr + tmpsiz - s,
 291                                               "%-4d %7d %9d %6s %12d %9d %8s %7d %s\n",
 292                                               nrefs, nrtrrefs, alive_cnt,
 293                                               alive ? "up" : "down", last_ping,
 294                                               pingsent, "NA", down_ni,
 295                                               libcfs_nid2str(nid));
 296                         else
 297                                 s += snprintf(s, tmpstr + tmpsiz - s,
 298                                               "%-4d %7d %9d %6s %12d %9d %8lu %7d %s\n",
 299                                               nrefs, nrtrrefs, alive_cnt,
 300                                               alive ? "up" : "down", last_ping,
 301                                               pingsent,
 302                                               cfs_duration_sec(cfs_time_sub(deadline, now)),
 303                                               down_ni, libcfs_nid2str(nid));
 304                         LASSERT (tmpstr + tmpsiz - s > 0);
 305                 }
 306
 307                 LNET_UNLOCK();
 308         }
 309
 310         len = s - tmpstr;     /* how many bytes was written */
 311
 312         if (len > *lenp) {    /* linux-supplied buffer is too small */
 313                 rc = -EINVAL;
 314         } else if (len > 0) { /* wrote something */
 315                 if (cfs_copy_to_user(buffer, tmpstr, len))
 316                         rc = -EFAULT;
 317                 else
 318                         *ppos += 1;
 319         }
 320
 321         LIBCFS_FREE(tmpstr, tmpsiz);
 322
 323         if (rc == 0)
 324                 *lenp = len;
 325
 326         return rc;
 327 }
 328
 329 /*
 330  * NB: we don't use the highest bit of *ppos because it's signed;
 331  *     next 9 bits is used to stash idx (assuming that
 332  *     LNET_PEER_HASHSIZE < 512)
 333  */
 334 #define LNET_LOFFT_BITS (sizeof(loff_t) * 8)
 335 #define LNET_PHASH_BITS 9
 336 #define LNET_PHASH_IDX_MASK (((1ULL << LNET_PHASH_BITS) - 1) <<               \
 337                              (LNET_LOFFT_BITS - LNET_PHASH_BITS - 1))
 338 #define LNET_PHASH_NUM_MASK ((1ULL <<                                         \
 339                               (LNET_LOFFT_BITS - LNET_PHASH_BITS -1)) - 1)
 340 #define LNET_PHASH_IDX_GET(pos) (int)(((pos) & LNET_PHASH_IDX_MASK) >>  \
 341                                       (LNET_LOFFT_BITS - LNET_PHASH_BITS -1))
 342 #define LNET_PHASH_NUM_GET(pos) (int)((pos) & LNET_PHASH_NUM_MASK)
 343 #define LNET_PHASH_POS_MAKE(idx, num) ((((loff_t)idx) << (LNET_LOFFT_BITS -   \
 344                                                   LNET_PHASH_BITS -1)) | (num))
 345
 346 int LL_PROC_PROTO(proc_lnet_peers)
 347 {
 348         int        rc = 0;
 349         char      *tmpstr;
 350         char      *s;
 351         const int  tmpsiz      = 256;
 352         int        len;
 353         int       *ver_p       = (unsigned int *)(&filp->private_data);
 354         int        idx;
 355         int        num;
 356
 357         DECLARE_LL_PROC_PPOS_DECL;
 358
 359         idx = LNET_PHASH_IDX_GET(*ppos);
 360         num = LNET_PHASH_NUM_GET(*ppos);
 361
 362         CLASSERT ((1 << LNET_PHASH_BITS) > LNET_PEER_HASHSIZE);
 363
 364         LASSERT (!write);
 365
 366         if (*lenp == 0)
 367                 return 0;
 368
 369         LIBCFS_ALLOC(tmpstr, tmpsiz);
 370         if (tmpstr == NULL)
 371                 return -ENOMEM;
 372
 373         s = tmpstr; /* points to current position in tmpstr[] */
 374
 375         if (*ppos == 0) {
 376                 s += snprintf(s, tmpstr + tmpsiz - s,
 377                               "%-24s %4s %5s %5s %5s %5s %5s %5s %s\n",
 378                               "nid", "refs", "state", "max",
 379                               "rtr", "min", "tx", "min", "queue");
 380                 LASSERT (tmpstr + tmpsiz - s > 0);
 381
 382                 LNET_LOCK();
 383                 *ver_p  = (unsigned int)the_lnet.ln_peertable_version;
 384                 LNET_UNLOCK();
 385
 386                 num++;
 387         } else {
 388                 cfs_list_t        *p    = NULL;
 389                 lnet_peer_t       *peer = NULL;
 390                 int                skip = num - 1;
 391
 392                 LNET_LOCK();
 393
 394                 if (*ver_p != (unsigned int)the_lnet.ln_peertable_version) {
 395                         LNET_UNLOCK();
 396                         LIBCFS_FREE(tmpstr, tmpsiz);
 397                         return -ESTALE;
 398                 }
 399
 400                 while (idx < LNET_PEER_HASHSIZE) {
 401                         if (p == NULL)
 402                                 p = the_lnet.ln_peer_hash[idx].next;
 403
 404                         while (p != &the_lnet.ln_peer_hash[idx]) {
 405                                 lnet_peer_t *lp = cfs_list_entry(p, lnet_peer_t,
 406                                                                  lp_hashlist);
 407                                 if (skip == 0) {
 408                                         peer = lp;
 409
 410                                         /* minor optimiztion: start from idx+1
 411                                          * on next iteration if we've just
 412                                          * drained lp_hashlist */
 413                                         if (lp->lp_hashlist.next ==
 414                                             &the_lnet.ln_peer_hash[idx]) {
 415                                                 num = 1;
 416                                                 idx++;
 417                                         } else {
 418                                                 num++;
 419                                         }
 420
 421                                         break;
 422                                 }
 423
 424                                 skip--;
 425                                 p = lp->lp_hashlist.next;
 426                         }
 427
 428                         if (peer != NULL)
 429                                 break;
 430
 431                         p = NULL;
 432                         num = 1;
 433                         idx++;
 434                 }
 435
 436                 if (peer != NULL) {
 437                         lnet_nid_t nid       = peer->lp_nid;
 438                         int        nrefs     = peer->lp_refcount;
 439                         char      *aliveness = "NA";
 440                         int        maxcr     = peer->lp_ni->ni_peertxcredits;
 441                         int        txcr      = peer->lp_txcredits;
 442                         int        mintxcr   = peer->lp_mintxcredits;
 443                         int        rtrcr     = peer->lp_rtrcredits;
 444                         int        minrtrcr  = peer->lp_minrtrcredits;
 445                         int        txqnob    = peer->lp_txqnob;
 446
 447                         if (lnet_isrouter(peer) ||
 448                             lnet_peer_aliveness_enabled(peer))
 449                                 aliveness = peer->lp_alive ? "up" : "down";
 450
 451                         s += snprintf(s, tmpstr + tmpsiz - s,
 452                                       "%-24s %4d %5s %5d %5d %5d %5d %5d %d\n",
 453                                       libcfs_nid2str(nid), nrefs, aliveness,
 454                                       maxcr, rtrcr, minrtrcr, txcr,
 455                                       mintxcr, txqnob);
 456                         LASSERT (tmpstr + tmpsiz - s > 0);
 457                 }
 458
 459                 LNET_UNLOCK();
 460         }
 461
 462         len = s - tmpstr;     /* how many bytes was written */
 463
 464         if (len > *lenp) {    /* linux-supplied buffer is too small */
 465                 rc = -EINVAL;
 466         } else if (len > 0) { /* wrote something */
 467                 if (cfs_copy_to_user(buffer, tmpstr, len))
 468                         rc = -EFAULT;
 469                 else
 470                         *ppos = LNET_PHASH_POS_MAKE(idx, num);
 471         }
 472
 473         LIBCFS_FREE(tmpstr, tmpsiz);
 474
 475         if (rc == 0)
 476                 *lenp = len;
 477
 478         return rc;
 479 }
 480
 481 static int __proc_lnet_buffers(void *data, int write,
 482                                loff_t pos, void *buffer, int nob)
 483 {
 484
 485         int              rc;
 486         int              len;
 487         char            *s;
 488         char            *tmpstr;
 489         const int        tmpsiz = 64 * (LNET_NRBPOOLS + 1); /* (4 %d) * 4 */
 490         int              idx;
 491
 492         LASSERT (!write);
 493
 494         LIBCFS_ALLOC(tmpstr, tmpsiz);
 495         if (tmpstr == NULL)
 496                 return -ENOMEM;
 497
 498         s = tmpstr; /* points to current position in tmpstr[] */
 499
 500         s += snprintf(s, tmpstr + tmpsiz - s,
 501                       "%5s %5s %7s %7s\n",
 502                       "pages", "count", "credits", "min");
 503         LASSERT (tmpstr + tmpsiz - s > 0);
 504
 505         LNET_LOCK();
 506
 507         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 508                 lnet_rtrbufpool_t *rbp = &the_lnet.ln_rtrpools[idx];
 509
 510                 int npages = rbp->rbp_npages;
 511                 int nbuf   = rbp->rbp_nbuffers;
 512                 int cr     = rbp->rbp_credits;
 513                 int mincr  = rbp->rbp_mincredits;
 514
 515                 s += snprintf(s, tmpstr + tmpsiz - s,
 516                               "%5d %5d %7d %7d\n",
 517                               npages, nbuf, cr, mincr);
 518                 LASSERT (tmpstr + tmpsiz - s > 0);
 519         }
 520
 521         LNET_UNLOCK();
 522
 523         len = s - tmpstr;
 524
 525         if (pos >= min_t(int, len, strlen(tmpstr)))
 526                 rc = 0;
 527         else
 528                 rc = cfs_trace_copyout_string(buffer, nob,
 529                                               tmpstr + pos, NULL);
 530
 531         LIBCFS_FREE(tmpstr, tmpsiz);
 532         return rc;
 533 }
 534
 535 DECLARE_PROC_HANDLER(proc_lnet_buffers);
 536
 537 int LL_PROC_PROTO(proc_lnet_nis)
 538 {
 539         int        rc = 0;
 540         char      *tmpstr;
 541         char      *s;
 542         const int  tmpsiz = 256;
 543         int        len;
 544
 545         DECLARE_LL_PROC_PPOS_DECL;
 546
 547         LASSERT (!write);
 548
 549         if (*lenp == 0)
 550                 return 0;
 551
 552         LIBCFS_ALLOC(tmpstr, tmpsiz);
 553         if (tmpstr == NULL)
 554                 return -ENOMEM;
 555
 556         s = tmpstr; /* points to current position in tmpstr[] */
 557
 558         if (*ppos == 0) {
 559                 s += snprintf(s, tmpstr + tmpsiz - s,
 560                               "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 561                               "nid", "status", "alive", "refs", "peer",
 562                               "rtr", "max", "tx", "min");
 563                 LASSERT (tmpstr + tmpsiz - s > 0);
 564         } else {
 565                 cfs_list_t        *n;
 566                 lnet_ni_t         *ni   = NULL;
 567                 int                skip = *ppos - 1;
 568
 569                 LNET_LOCK();
 570
 571                 n = the_lnet.ln_nis.next;
 572
 573                 while (n != &the_lnet.ln_nis) {
 574                         lnet_ni_t *a_ni = cfs_list_entry(n, lnet_ni_t, ni_list);
 575
 576                         if (skip == 0) {
 577                                 ni = a_ni;
 578                                 break;
 579                         }
 580
 581                         skip--;
 582                         n = n->next;
 583                 }
 584
 585                 if (ni != NULL) {
 586                         cfs_time_t now = cfs_time_current();
 587                         int        last_alive = -1;
 588                         int        maxtxcr = ni->ni_maxtxcredits;
 589                         int        txcr = ni->ni_txcredits;
 590                         int        mintxcr = ni->ni_mintxcredits;
 591                         int        npeertxcr = ni->ni_peertxcredits;
 592                         int        npeerrtrcr = ni->ni_peerrtrcredits;
 593                         lnet_nid_t nid = ni->ni_nid;
 594                         int        nref = ni->ni_refcount;
 595                         char      *stat;
 596
 597                         if (the_lnet.ln_routing)
 598                                 last_alive = cfs_duration_sec(cfs_time_sub(now,
 599                                                             ni->ni_last_alive));
 600                         if (ni->ni_lnd->lnd_type == LOLND)  /* @lo forever alive */
 601                                 last_alive = 0;
 602
 603                         LASSERT (ni->ni_status != NULL);
 604                         stat = (ni->ni_status->ns_status == LNET_NI_STATUS_UP) ?
 605                                                                   "up" : "down";
 606
 607                         s += snprintf(s, tmpstr + tmpsiz - s,
 608                                       "%-24s %6s %5d %4d %4d %4d %5d %5d %5d\n",
 609                                       libcfs_nid2str(nid), stat, last_alive, nref,
 610                                       npeertxcr, npeerrtrcr, maxtxcr,
 611                                       txcr, mintxcr);
 612                         LASSERT (tmpstr + tmpsiz - s > 0);
 613                 }
 614
 615                 LNET_UNLOCK();
 616         }
 617
 618         len = s - tmpstr;     /* how many bytes was written */
 619
 620         if (len > *lenp) {    /* linux-supplied buffer is too small */
 621                 rc = -EINVAL;
 622         } else if (len > 0) { /* wrote something */
 623                 if (cfs_copy_to_user(buffer, tmpstr, len))
 624                         rc = -EFAULT;
 625                 else
 626                         *ppos += 1;
 627         }
 628
 629         LIBCFS_FREE(tmpstr, tmpsiz);
 630
 631         if (rc == 0)
 632                 *lenp = len;
 633
 634         return rc;
 635 }
 636
 637 static cfs_sysctl_table_t lnet_table[] = {
 638         /*
 639          * NB No .strategy entries have been provided since sysctl(8) prefers
 640          * to go via /proc for portability.
 641          */
 642         {
 643                 .ctl_name = PSDEV_LNET_STATS,
 644                 .procname = "stats",
 645                 .mode     = 0644,
 646                 .proc_handler = &proc_lnet_stats,
 647         },
 648         {
 649                 .ctl_name = PSDEV_LNET_ROUTES,
 650                 .procname = "routes",
 651                 .mode     = 0444,
 652                 .proc_handler = &proc_lnet_routes,
 653         },
 654         {
 655                 .ctl_name = PSDEV_LNET_ROUTERS,
 656                 .procname = "routers",
 657                 .mode     = 0444,
 658                 .proc_handler = &proc_lnet_routers,
 659         },
 660         {
 661                 .ctl_name = PSDEV_LNET_PEERS,
 662                 .procname = "peers",
 663                 .mode     = 0444,
 664                 .proc_handler = &proc_lnet_peers,
 665         },
 666         {
 667                 .ctl_name = PSDEV_LNET_PEERS,
 668                 .procname = "buffers",
 669                 .mode     = 0444,
 670                 .proc_handler = &proc_lnet_buffers,
 671         },
 672         {
 673                 .ctl_name = PSDEV_LNET_NIS,
 674                 .procname = "nis",
 675                 .mode     = 0444,
 676                 .proc_handler = &proc_lnet_nis,
 677         },
 678         {0}
 679 };
 680
 681 static cfs_sysctl_table_t top_table[] = {
 682         {
 683                 .ctl_name = CTL_LNET,
 684                 .procname = "lnet",
 685                 .mode     = 0555,
 686                 .data     = NULL,
 687                 .maxlen   = 0,
 688                 .child    = lnet_table,
 689         },
 690         {
 691                 .ctl_name = 0
 692         }
 693 };
 694
 695 void
 696 lnet_proc_init(void)
 697 {
 698 #ifdef CONFIG_SYSCTL
 699         if (lnet_table_header == NULL)
 700                 lnet_table_header = cfs_register_sysctl_table(top_table, 0);
 701 #endif
 702 }
 703
 704 void
 705 lnet_proc_fini(void)
 706 {
 707 #ifdef CONFIG_SYSCTL
 708         if (lnet_table_header != NULL)
 709                 cfs_unregister_sysctl_table(lnet_table_header);
 710
 711         lnet_table_header = NULL;
 712 #endif
 713 }
 714
 715 #else
 716
 717 void
 718 lnet_proc_init(void)
 719 {
 720 }
 721
 722 void
 723 lnet_proc_fini(void)
 724 {
 725 }
 726
 727 #endif