lnet/lnet/router_proc.c

   1 /*
   2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Copyright (c) 2011, Whamcloud, Inc.
   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_counters_reset();
 101                 return 0;
 102         }
 103
 104         /* read */
 105
 106         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
 107         if (ctrs == NULL)
 108                 return -ENOMEM;
 109
 110         LIBCFS_ALLOC(tmpstr, tmpsiz);
 111         if (tmpstr == NULL) {
 112                 LIBCFS_FREE(ctrs, sizeof(*ctrs));
 113                 return -ENOMEM;
 114         }
 115
 116         lnet_counters_get(ctrs);
 117
 118         len = snprintf(tmpstr, tmpsiz,
 119                        "%u %u %u %u %u %u %u "LPU64" "LPU64" "
 120                        LPU64" "LPU64,
 121                        ctrs->msgs_alloc, ctrs->msgs_max,
 122                        ctrs->errors,
 123                        ctrs->send_count, ctrs->recv_count,
 124                        ctrs->route_count, ctrs->drop_count,
 125                        ctrs->send_length, ctrs->recv_length,
 126                        ctrs->route_length, ctrs->drop_length);
 127
 128         if (pos >= min_t(int, len, strlen(tmpstr)))
 129                 rc = 0;
 130         else
 131                 rc = cfs_trace_copyout_string(buffer, nob,
 132                                               tmpstr + pos, "\n");
 133
 134         LIBCFS_FREE(tmpstr, tmpsiz);
 135         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 136         return rc;
 137 }
 138
 139 DECLARE_PROC_HANDLER(proc_lnet_stats);
 140
 141 int LL_PROC_PROTO(proc_lnet_routes)
 142 {
 143         int        rc     = 0;
 144         char      *tmpstr;
 145         char      *s;
 146         const int  tmpsiz = 256;
 147         int        len;
 148         int        ver;
 149         int        num;
 150
 151         DECLARE_LL_PROC_PPOS_DECL;
 152
 153         num = LNET_PHASH_NUM_GET(*ppos);
 154         ver = LNET_VERSION_GET(*ppos);
 155
 156         LASSERT (!write);
 157
 158         if (*lenp == 0)
 159                 return 0;
 160
 161         LIBCFS_ALLOC(tmpstr, tmpsiz);
 162         if (tmpstr == NULL)
 163                 return -ENOMEM;
 164
 165         s = tmpstr; /* points to current position in tmpstr[] */
 166
 167         if (*ppos == 0) {
 168                 s += snprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 169                               the_lnet.ln_routing ? "enabled" : "disabled");
 170                 LASSERT (tmpstr + tmpsiz - s > 0);
 171
 172                 s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %7s %s\n",
 173                               "net", "hops", "state", "router");
 174                 LASSERT (tmpstr + tmpsiz - s > 0);
 175
 176                 LNET_LOCK();
 177                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 178                 LNET_UNLOCK();
 179                 *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 180         } else {
 181                 cfs_list_t        *n;
 182                 cfs_list_t        *r;
 183                 lnet_route_t      *route = NULL;
 184                 lnet_remotenet_t  *rnet  = NULL;
 185                 int                skip  = num - 1;
 186
 187                 LNET_LOCK();
 188
 189                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_remote_nets_version)) {
 190                         LNET_UNLOCK();
 191                         LIBCFS_FREE(tmpstr, tmpsiz);
 192                         return -ESTALE;
 193                 }
 194
 195                 n = the_lnet.ln_remote_nets.next;
 196
 197                 while (n != &the_lnet.ln_remote_nets && route == NULL) {
 198                         rnet = cfs_list_entry(n, lnet_remotenet_t, lrn_list);
 199
 200                         r = rnet->lrn_routes.next;
 201
 202                         while (r != &rnet->lrn_routes) {
 203                                 lnet_route_t *re =
 204                                         cfs_list_entry(r, lnet_route_t,
 205                                                        lr_list);
 206                                 if (skip == 0) {
 207                                         route = re;
 208                                         break;
 209                                 }
 210
 211                                 skip--;
 212                                 r = r->next;
 213                         }
 214
 215                         n = n->next;
 216                 }
 217
 218                 if (route != NULL) {
 219                         __u32        net   = rnet->lrn_net;
 220                         unsigned int hops  = route->lr_hops;
 221                         lnet_nid_t   nid   = route->lr_gateway->lp_nid;
 222                         int          alive = route->lr_gateway->lp_alive;
 223
 224                         s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4u %7s %s\n",
 225                                       libcfs_net2str(net), hops,
 226                                       alive ? "up" : "down", libcfs_nid2str(nid));
 227                         LASSERT (tmpstr + tmpsiz - s > 0);
 228                 }
 229
 230                 LNET_UNLOCK();
 231         }
 232
 233         len = s - tmpstr;     /* how many bytes was written */
 234
 235         if (len > *lenp) {    /* linux-supplied buffer is too small */
 236                 rc = -EINVAL;
 237         } else if (len > 0) { /* wrote something */
 238                 if (cfs_copy_to_user(buffer, tmpstr, len))
 239                         rc = -EFAULT;
 240                 else {
 241                         num += 1;
 242                         *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 243                 }
 244         }
 245
 246         LIBCFS_FREE(tmpstr, tmpsiz);
 247
 248         if (rc == 0)
 249                 *lenp = len;
 250
 251         return rc;
 252 }
 253
 254 int LL_PROC_PROTO(proc_lnet_routers)
 255 {
 256         int        rc = 0;
 257         char      *tmpstr;
 258         char      *s;
 259         const int  tmpsiz = 256;
 260         int        len;
 261         int        ver;
 262         int        num;
 263
 264         DECLARE_LL_PROC_PPOS_DECL;
 265
 266         num = LNET_PHASH_NUM_GET(*ppos);
 267         ver = LNET_VERSION_GET(*ppos);
 268
 269         LASSERT (!write);
 270
 271         if (*lenp == 0)
 272                 return 0;
 273
 274         LIBCFS_ALLOC(tmpstr, tmpsiz);
 275         if (tmpstr == NULL)
 276                 return -ENOMEM;
 277
 278         s = tmpstr; /* points to current position in tmpstr[] */
 279
 280         if (*ppos == 0) {
 281                 s += snprintf(s, tmpstr + tmpsiz - s,
 282                               "%-4s %7s %9s %6s %12s %9s %8s %7s %s\n",
 283                               "ref", "rtr_ref", "alive_cnt", "state", "last_ping",
 284                               "ping_sent", "deadline", "down_ni", "router");
 285                 LASSERT (tmpstr + tmpsiz - s > 0);
 286
 287                 LNET_LOCK();
 288                 ver = (unsigned int)the_lnet.ln_routers_version;
 289                 LNET_UNLOCK();
 290                 *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 291         } else {
 292                 cfs_list_t        *r;
 293                 lnet_peer_t       *peer = NULL;
 294                 int                skip = num - 1;
 295
 296                 LNET_LOCK();
 297
 298                 if (ver != LNET_VERSION_VALID_MASK(the_lnet.ln_routers_version)) {
 299                         LNET_UNLOCK();
 300                         LIBCFS_FREE(tmpstr, tmpsiz);
 301                         return -ESTALE;
 302                 }
 303
 304                 r = the_lnet.ln_routers.next;
 305
 306                 while (r != &the_lnet.ln_routers) {
 307                         lnet_peer_t *lp = cfs_list_entry(r, lnet_peer_t,
 308                                                          lp_rtr_list);
 309
 310                         if (skip == 0) {
 311                                 peer = lp;
 312                                 break;
 313                         }
 314
 315                         skip--;
 316                         r = r->next;
 317                 }
 318
 319                 if (peer != NULL) {
 320                         lnet_nid_t nid = peer->lp_nid;
 321                         cfs_time_t now = cfs_time_current();
 322                         cfs_time_t deadline = peer->lp_ping_deadline;
 323                         int nrefs     = peer->lp_refcount;
 324                         int nrtrrefs  = peer->lp_rtr_refcount;
 325                         int alive_cnt = peer->lp_alive_count;
 326                         int alive     = peer->lp_alive;
 327                         int pingsent  = !peer->lp_ping_notsent;
 328                         int last_ping = cfs_duration_sec(cfs_time_sub(now,
 329                                                      peer->lp_ping_timestamp));
 330                         int down_ni   = 0;
 331                         lnet_route_t *rtr;
 332
 333                         if (peer->lp_ping_version == LNET_PROTO_PING_VERSION) {
 334                                 cfs_list_for_each_entry(rtr, &peer->lp_routes,
 335                                                         lr_gwlist) {
 336                                         /* downis on any route should be the
 337                                          * number of downis on the gateway */
 338                                         if (rtr->lr_downis != 0) {
 339                                                 down_ni = rtr->lr_downis;
 340                                                 break;
 341                                         }
 342                                 }
 343                         }
 344
 345                         if (deadline == 0)
 346                                 s += snprintf(s, tmpstr + tmpsiz - s,
 347                                               "%-4d %7d %9d %6s %12d %9d %8s %7d %s\n",
 348                                               nrefs, nrtrrefs, alive_cnt,
 349                                               alive ? "up" : "down", last_ping,
 350                                               pingsent, "NA", down_ni,
 351                                               libcfs_nid2str(nid));
 352                         else
 353                                 s += snprintf(s, tmpstr + tmpsiz - s,
 354                                               "%-4d %7d %9d %6s %12d %9d %8lu %7d %s\n",
 355                                               nrefs, nrtrrefs, alive_cnt,
 356                                               alive ? "up" : "down", last_ping,
 357                                               pingsent,
 358                                               cfs_duration_sec(cfs_time_sub(deadline, now)),
 359                                               down_ni, libcfs_nid2str(nid));
 360                         LASSERT (tmpstr + tmpsiz - s > 0);
 361                 }
 362
 363                 LNET_UNLOCK();
 364         }
 365
 366         len = s - tmpstr;     /* how many bytes was written */
 367
 368         if (len > *lenp) {    /* linux-supplied buffer is too small */
 369                 rc = -EINVAL;
 370         } else if (len > 0) { /* wrote something */
 371                 if (cfs_copy_to_user(buffer, tmpstr, len))
 372                         rc = -EFAULT;
 373                 else {
 374                         num += 1;
 375                         *ppos = LNET_PHASH_POS_MAKE(ver, 0, num);
 376                 }
 377         }
 378
 379         LIBCFS_FREE(tmpstr, tmpsiz);
 380
 381         if (rc == 0)
 382                 *lenp = len;
 383
 384         return rc;
 385 }
 386
 387 int LL_PROC_PROTO(proc_lnet_peers)
 388 {
 389         struct lnet_peer_table  *ptable = the_lnet.ln_peer_table;
 390         int        rc = 0;
 391         char      *tmpstr;
 392         char      *s;
 393         const int  tmpsiz      = 256;
 394         int        len;
 395         int        ver;
 396         int        idx;
 397         int        num;
 398
 399         DECLARE_LL_PROC_PPOS_DECL;
 400
 401         idx = LNET_PHASH_IDX_GET(*ppos);
 402         num = LNET_PHASH_NUM_GET(*ppos);
 403         ver = LNET_VERSION_GET(*ppos);
 404
 405         CLASSERT ((1ULL << LNET_PHASH_BITS) > LNET_PEER_HASHSIZE);
 406
 407         LASSERT (!write);
 408
 409         if (*lenp == 0)
 410                 return 0;
 411
 412         LIBCFS_ALLOC(tmpstr, tmpsiz);
 413         if (tmpstr == NULL)
 414                 return -ENOMEM;
 415
 416         s = tmpstr; /* points to current position in tmpstr[] */
 417
 418         if (*ppos == 0) {
 419                 s += snprintf(s, tmpstr + tmpsiz - s,
 420                               "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 421                               "nid", "refs", "state", "last", "max",
 422                               "rtr", "min", "tx", "min", "queue");
 423                 LASSERT (tmpstr + tmpsiz - s > 0);
 424
 425                 LNET_LOCK();
 426                 ver = (unsigned int)ptable->pt_version;
 427                 LNET_UNLOCK();
 428                 *ppos = LNET_PHASH_POS_MAKE(ver, idx, num);
 429
 430                 num++;
 431         } else {
 432                 cfs_list_t        *p    = NULL;
 433                 lnet_peer_t       *peer = NULL;
 434                 int                skip = num - 1;
 435
 436                 LNET_LOCK();
 437
 438                 if (ver != LNET_VERSION_VALID_MASK(ptable->pt_version)) {
 439                         LNET_UNLOCK();
 440                         LIBCFS_FREE(tmpstr, tmpsiz);
 441                         return -ESTALE;
 442                 }
 443
 444                 while (idx < LNET_PEER_HASHSIZE) {
 445                         if (p == NULL)
 446                                 p = ptable->pt_hash[idx].next;
 447
 448                         while (p != &ptable->pt_hash[idx]) {
 449                                 lnet_peer_t *lp = cfs_list_entry(p, lnet_peer_t,
 450                                                                  lp_hashlist);
 451                                 if (skip == 0) {
 452                                         peer = lp;
 453
 454                                         /* minor optimization: start from idx+1
 455                                          * on next iteration if we've just
 456                                          * drained lp_hashlist */
 457                                         if (lp->lp_hashlist.next ==
 458                                             &ptable->pt_hash[idx]) {
 459                                                 num = 1;
 460                                                 idx++;
 461                                         } else {
 462                                                 num++;
 463                                         }
 464
 465                                         break;
 466                                 }
 467
 468                                 skip--;
 469                                 p = lp->lp_hashlist.next;
 470                         }
 471
 472                         if (peer != NULL)
 473                                 break;
 474
 475                         p = NULL;
 476                         num = 1;
 477                         idx++;
 478                 }
 479
 480                 if (peer != NULL) {
 481                         lnet_nid_t nid       = peer->lp_nid;
 482                         int        nrefs     = peer->lp_refcount;
 483                         int        lastalive = -1;
 484                         char      *aliveness = "NA";
 485                         int        maxcr     = peer->lp_ni->ni_peertxcredits;
 486                         int        txcr      = peer->lp_txcredits;
 487                         int        mintxcr   = peer->lp_mintxcredits;
 488                         int        rtrcr     = peer->lp_rtrcredits;
 489                         int        minrtrcr  = peer->lp_minrtrcredits;
 490                         int        txqnob    = peer->lp_txqnob;
 491
 492                         if (lnet_isrouter(peer) ||
 493                             lnet_peer_aliveness_enabled(peer))
 494                                 aliveness = peer->lp_alive ? "up" : "down";
 495
 496                         if (lnet_peer_aliveness_enabled(peer)) {
 497                                 cfs_time_t     now = cfs_time_current();
 498                                 cfs_duration_t delta;
 499
 500                                 delta = cfs_time_sub(now, peer->lp_last_alive);
 501                                 lastalive = cfs_duration_sec(delta);
 502
 503                                 /* No need to mess up peers contents with
 504                                  * arbitrarily long integers - it suffices to
 505                                  * know that lastalive is more than 10000s old
 506                                  */
 507                                 if (lastalive >= 10000)
 508                                         lastalive = 9999;
 509                         }
 510
 511                         s += snprintf(s, tmpstr + tmpsiz - s,
 512                                       "%-24s %4d %5s %5d %5d %5d %5d %5d %5d %d\n",
 513                                       libcfs_nid2str(nid), nrefs, aliveness,
 514                                       lastalive, maxcr, rtrcr, minrtrcr, txcr,
 515                                       mintxcr, txqnob);
 516                         LASSERT (tmpstr + tmpsiz - s > 0);
 517                 }
 518
 519                 LNET_UNLOCK();
 520         }
 521
 522         len = s - tmpstr;     /* how many bytes was written */
 523
 524         if (len > *lenp) {    /* linux-supplied buffer is too small */
 525                 rc = -EINVAL;
 526         } else if (len > 0) { /* wrote something */
 527                 if (cfs_copy_to_user(buffer, tmpstr, len))
 528                         rc = -EFAULT;
 529                 else
 530                         *ppos = LNET_PHASH_POS_MAKE(ver, idx, num);
 531         }
 532
 533         LIBCFS_FREE(tmpstr, tmpsiz);
 534
 535         if (rc == 0)
 536                 *lenp = len;
 537
 538         return rc;
 539 }
 540
 541 static int __proc_lnet_buffers(void *data, int write,
 542                                loff_t pos, void *buffer, int nob)
 543 {
 544
 545         int              rc;
 546         int              len;
 547         char            *s;
 548         char            *tmpstr;
 549         const int        tmpsiz = 64 * (LNET_NRBPOOLS + 1); /* (4 %d) * 4 */
 550         int              idx;
 551
 552         LASSERT (!write);
 553
 554         LIBCFS_ALLOC(tmpstr, tmpsiz);
 555         if (tmpstr == NULL)
 556                 return -ENOMEM;
 557
 558         s = tmpstr; /* points to current position in tmpstr[] */
 559
 560         s += snprintf(s, tmpstr + tmpsiz - s,
 561                       "%5s %5s %7s %7s\n",
 562                       "pages", "count", "credits", "min");
 563         LASSERT (tmpstr + tmpsiz - s > 0);
 564
 565         if (the_lnet.ln_rtrpools == NULL)
 566                 goto out; /* I'm not a router */
 567
 568         LNET_LOCK();
 569
 570         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 571                 lnet_rtrbufpool_t *rbp = &the_lnet.ln_rtrpools[idx];
 572
 573                 int npages = rbp->rbp_npages;
 574                 int nbuf   = rbp->rbp_nbuffers;
 575                 int cr     = rbp->rbp_credits;
 576                 int mincr  = rbp->rbp_mincredits;
 577
 578                 s += snprintf(s, tmpstr + tmpsiz - s,
 579                               "%5d %5d %7d %7d\n",
 580                               npages, nbuf, cr, mincr);
 581                 LASSERT (tmpstr + tmpsiz - s > 0);
 582         }
 583
 584         LNET_UNLOCK();
 585
 586  out:
 587         len = s - tmpstr;
 588
 589         if (pos >= min_t(int, len, strlen(tmpstr)))
 590                 rc = 0;
 591         else
 592                 rc = cfs_trace_copyout_string(buffer, nob,
 593                                               tmpstr + pos, NULL);
 594
 595         LIBCFS_FREE(tmpstr, tmpsiz);
 596         return rc;
 597 }
 598
 599 DECLARE_PROC_HANDLER(proc_lnet_buffers);
 600
 601 int LL_PROC_PROTO(proc_lnet_nis)
 602 {
 603         int        rc = 0;
 604         char      *tmpstr;
 605         char      *s;
 606         const int  tmpsiz = 256;
 607         int        len;
 608
 609         DECLARE_LL_PROC_PPOS_DECL;
 610
 611         LASSERT (!write);
 612
 613         if (*lenp == 0)
 614                 return 0;
 615
 616         LIBCFS_ALLOC(tmpstr, tmpsiz);
 617         if (tmpstr == NULL)
 618                 return -ENOMEM;
 619
 620         s = tmpstr; /* points to current position in tmpstr[] */
 621
 622         if (*ppos == 0) {
 623                 s += snprintf(s, tmpstr + tmpsiz - s,
 624                               "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 625                               "nid", "status", "alive", "refs", "peer",
 626                               "rtr", "max", "tx", "min");
 627                 LASSERT (tmpstr + tmpsiz - s > 0);
 628         } else {
 629                 cfs_list_t        *n;
 630                 lnet_ni_t         *ni   = NULL;
 631                 int                skip = *ppos - 1;
 632
 633                 LNET_LOCK();
 634
 635                 n = the_lnet.ln_nis.next;
 636
 637                 while (n != &the_lnet.ln_nis) {
 638                         lnet_ni_t *a_ni = cfs_list_entry(n, lnet_ni_t, ni_list);
 639
 640                         if (skip == 0) {
 641                                 ni = a_ni;
 642                                 break;
 643                         }
 644
 645                         skip--;
 646                         n = n->next;
 647                 }
 648
 649                 if (ni != NULL) {
 650                         cfs_time_t now = cfs_time_current();
 651                         int        last_alive = -1;
 652                         int        maxtxcr = ni->ni_maxtxcredits;
 653                         int        txcr = ni->ni_txcredits;
 654                         int        mintxcr = ni->ni_mintxcredits;
 655                         int        npeertxcr = ni->ni_peertxcredits;
 656                         int        npeerrtrcr = ni->ni_peerrtrcredits;
 657                         lnet_nid_t nid = ni->ni_nid;
 658                         int        nref = ni->ni_refcount;
 659                         char      *stat;
 660
 661                         if (the_lnet.ln_routing)
 662                                 last_alive = cfs_duration_sec(cfs_time_sub(now,
 663                                                             ni->ni_last_alive));
 664                         if (ni->ni_lnd->lnd_type == LOLND)  /* @lo forever alive */
 665                                 last_alive = 0;
 666
 667                         LASSERT (ni->ni_status != NULL);
 668                         stat = (ni->ni_status->ns_status == LNET_NI_STATUS_UP) ?
 669                                                                   "up" : "down";
 670
 671                         s += snprintf(s, tmpstr + tmpsiz - s,
 672                                       "%-24s %6s %5d %4d %4d %4d %5d %5d %5d\n",
 673                                       libcfs_nid2str(nid), stat, last_alive, nref,
 674                                       npeertxcr, npeerrtrcr, maxtxcr,
 675                                       txcr, mintxcr);
 676                         LASSERT (tmpstr + tmpsiz - s > 0);
 677                 }
 678
 679                 LNET_UNLOCK();
 680         }
 681
 682         len = s - tmpstr;     /* how many bytes was written */
 683
 684         if (len > *lenp) {    /* linux-supplied buffer is too small */
 685                 rc = -EINVAL;
 686         } else if (len > 0) { /* wrote something */
 687                 if (cfs_copy_to_user(buffer, tmpstr, len))
 688                         rc = -EFAULT;
 689                 else
 690                         *ppos += 1;
 691         }
 692
 693         LIBCFS_FREE(tmpstr, tmpsiz);
 694
 695         if (rc == 0)
 696                 *lenp = len;
 697
 698         return rc;
 699 }
 700
 701 static cfs_sysctl_table_t lnet_table[] = {
 702         /*
 703          * NB No .strategy entries have been provided since sysctl(8) prefers
 704          * to go via /proc for portability.
 705          */
 706         {
 707                 INIT_CTL_NAME(PSDEV_LNET_STATS)
 708                 .procname = "stats",
 709                 .mode     = 0644,
 710                 .proc_handler = &proc_lnet_stats,
 711         },
 712         {
 713                 INIT_CTL_NAME(PSDEV_LNET_ROUTES)
 714                 .procname = "routes",
 715                 .mode     = 0444,
 716                 .proc_handler = &proc_lnet_routes,
 717         },
 718         {
 719                 INIT_CTL_NAME(PSDEV_LNET_ROUTERS)
 720                 .procname = "routers",
 721                 .mode     = 0444,
 722                 .proc_handler = &proc_lnet_routers,
 723         },
 724         {
 725                 INIT_CTL_NAME(PSDEV_LNET_PEERS)
 726                 .procname = "peers",
 727                 .mode     = 0444,
 728                 .proc_handler = &proc_lnet_peers,
 729         },
 730         {
 731                 INIT_CTL_NAME(PSDEV_LNET_PEERS)
 732                 .procname = "buffers",
 733                 .mode     = 0444,
 734                 .proc_handler = &proc_lnet_buffers,
 735         },
 736         {
 737                 INIT_CTL_NAME(PSDEV_LNET_NIS)
 738                 .procname = "nis",
 739                 .mode     = 0444,
 740                 .proc_handler = &proc_lnet_nis,
 741         },
 742         {
 743                 INIT_CTL_NAME(0)
 744         }
 745 };
 746
 747 static cfs_sysctl_table_t top_table[] = {
 748         {
 749                 INIT_CTL_NAME(CTL_LNET)
 750                 .procname = "lnet",
 751                 .mode     = 0555,
 752                 .data     = NULL,
 753                 .maxlen   = 0,
 754                 .child    = lnet_table,
 755         },
 756         {
 757                 INIT_CTL_NAME(0)
 758         }
 759 };
 760
 761 void
 762 lnet_proc_init(void)
 763 {
 764 #ifdef CONFIG_SYSCTL
 765         if (lnet_table_header == NULL)
 766                 lnet_table_header = cfs_register_sysctl_table(top_table, 0);
 767 #endif
 768 }
 769
 770 void
 771 lnet_proc_fini(void)
 772 {
 773 #ifdef CONFIG_SYSCTL
 774         if (lnet_table_header != NULL)
 775                 cfs_unregister_sysctl_table(lnet_table_header);
 776
 777         lnet_table_header = NULL;
 778 #endif
 779 }
 780
 781 #else
 782
 783 void
 784 lnet_proc_init(void)
 785 {
 786 }
 787
 788 void
 789 lnet_proc_fini(void)
 790 {
 791 }
 792
 793 #endif