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 #define LNET_LOFFT_BITS         (sizeof(loff_t) * 8)
  56 /*
  57  * NB: max allowed LNET_CPT_BITS is 8 on 64-bit system and 2 on 32-bit system
  58  */
  59 #define LNET_PROC_CPT_BITS      LNET_CPT_BITS
  60 /* change version, 16 bits or 8 bits */
  61 #define LNET_PROC_VER_BITS      MAX(((MIN(LNET_LOFFT_BITS, 64)) / 4), 8)
  62
  63 #define LNET_PROC_HASH_BITS     LNET_PEER_HASH_BITS
  64 /*
  65  * bits for peer hash offset
  66  * NB: we don't use the highest bit of *ppos because it's signed
  67  */
  68 #define LNET_PROC_HOFF_BITS     (LNET_LOFFT_BITS -       \
  69                                  LNET_PROC_CPT_BITS -    \
  70                                  LNET_PROC_VER_BITS -    \
  71                                  LNET_PROC_HASH_BITS - 1)
  72 /* bits for hash index + position */
  73 #define LNET_PROC_HPOS_BITS     (LNET_PROC_HASH_BITS + LNET_PROC_HOFF_BITS)
  74 /* bits for peer hash table + hash version */
  75 #define LNET_PROC_VPOS_BITS     (LNET_PROC_HPOS_BITS + LNET_PROC_VER_BITS)
  76
  77 #define LNET_PROC_CPT_MASK      ((1ULL << LNET_PROC_CPT_BITS) - 1)
  78 #define LNET_PROC_VER_MASK      ((1ULL << LNET_PROC_VER_BITS) - 1)
  79 #define LNET_PROC_HASH_MASK     ((1ULL << LNET_PROC_HASH_BITS) - 1)
  80 #define LNET_PROC_HOFF_MASK     ((1ULL << LNET_PROC_HOFF_BITS) - 1)
  81
  82 #define LNET_PROC_CPT_GET(pos)                          \
  83         (int)(((pos) >> LNET_PROC_VPOS_BITS) & LNET_PROC_CPT_MASK)
  84
  85 #define LNET_PROC_VER_GET(pos)                          \
  86         (int)(((pos) >> LNET_PROC_HPOS_BITS) & LNET_PROC_VER_MASK)
  87
  88 #define LNET_PROC_HASH_GET(pos)                         \
  89         (int)(((pos) >> LNET_PROC_HOFF_BITS) & LNET_PROC_HASH_MASK)
  90
  91 #define LNET_PROC_HOFF_GET(pos)                         \
  92         (int)((pos) & LNET_PROC_HOFF_MASK)
  93
  94 #define LNET_PROC_POS_MAKE(cpt, ver, hash, off)         \
  95         (((((loff_t)(cpt)) & LNET_PROC_CPT_MASK) << LNET_PROC_VPOS_BITS) |   \
  96         ((((loff_t)(ver)) & LNET_PROC_VER_MASK) << LNET_PROC_HPOS_BITS) |   \
  97         ((((loff_t)(hash)) & LNET_PROC_HASH_MASK) << LNET_PROC_HOFF_BITS) | \
  98         ((off) & LNET_PROC_HOFF_MASK))
  99
 100 #define LNET_PROC_VERSION(v)    ((unsigned int)((v) & LNET_PROC_VER_MASK))
 101
 102 static int __proc_lnet_stats(void *data, int write,
 103                              loff_t pos, void *buffer, int nob)
 104 {
 105         int              rc;
 106         lnet_counters_t *ctrs;
 107         int              len;
 108         char            *tmpstr;
 109         const int        tmpsiz = 256; /* 7 %u and 4 LPU64 */
 110
 111         if (write) {
 112                 lnet_counters_reset();
 113                 return 0;
 114         }
 115
 116         /* read */
 117
 118         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
 119         if (ctrs == NULL)
 120                 return -ENOMEM;
 121
 122         LIBCFS_ALLOC(tmpstr, tmpsiz);
 123         if (tmpstr == NULL) {
 124                 LIBCFS_FREE(ctrs, sizeof(*ctrs));
 125                 return -ENOMEM;
 126         }
 127
 128         lnet_counters_get(ctrs);
 129
 130         len = snprintf(tmpstr, tmpsiz,
 131                        "%u %u %u %u %u %u %u "LPU64" "LPU64" "
 132                        LPU64" "LPU64,
 133                        ctrs->msgs_alloc, ctrs->msgs_max,
 134                        ctrs->errors,
 135                        ctrs->send_count, ctrs->recv_count,
 136                        ctrs->route_count, ctrs->drop_count,
 137                        ctrs->send_length, ctrs->recv_length,
 138                        ctrs->route_length, ctrs->drop_length);
 139
 140         if (pos >= min_t(int, len, strlen(tmpstr)))
 141                 rc = 0;
 142         else
 143                 rc = cfs_trace_copyout_string(buffer, nob,
 144                                               tmpstr + pos, "\n");
 145
 146         LIBCFS_FREE(tmpstr, tmpsiz);
 147         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 148         return rc;
 149 }
 150
 151 DECLARE_PROC_HANDLER(proc_lnet_stats);
 152
 153 int LL_PROC_PROTO(proc_lnet_routes)
 154 {
 155         const int       tmpsiz = 256;
 156         char            *tmpstr;
 157         char            *s;
 158         int             rc = 0;
 159         int             len;
 160         int             ver;
 161         int             off;
 162
 163         DECLARE_LL_PROC_PPOS_DECL;
 164
 165         CLASSERT(sizeof(loff_t) >= 4);
 166
 167         off = LNET_PROC_HOFF_GET(*ppos);
 168         ver = LNET_PROC_VER_GET(*ppos);
 169
 170         LASSERT (!write);
 171
 172         if (*lenp == 0)
 173                 return 0;
 174
 175         LIBCFS_ALLOC(tmpstr, tmpsiz);
 176         if (tmpstr == NULL)
 177                 return -ENOMEM;
 178
 179         s = tmpstr; /* points to current position in tmpstr[] */
 180
 181         if (*ppos == 0) {
 182                 s += snprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 183                               the_lnet.ln_routing ? "enabled" : "disabled");
 184                 LASSERT (tmpstr + tmpsiz - s > 0);
 185
 186                 s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %7s %s\n",
 187                               "net", "hops", "state", "router");
 188                 LASSERT (tmpstr + tmpsiz - s > 0);
 189
 190                 lnet_net_lock(0);
 191                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 192                 lnet_net_unlock(0);
 193                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 194         } else {
 195                 cfs_list_t              *n;
 196                 cfs_list_t              *r;
 197                 lnet_route_t            *route = NULL;
 198                 lnet_remotenet_t        *rnet  = NULL;
 199                 int                     skip  = off - 1;
 200
 201                 lnet_net_lock(0);
 202
 203                 if (ver != LNET_PROC_VERSION(the_lnet.ln_remote_nets_version)) {
 204                         lnet_net_unlock(0);
 205                         LIBCFS_FREE(tmpstr, tmpsiz);
 206                         return -ESTALE;
 207                 }
 208
 209                 n = the_lnet.ln_remote_nets.next;
 210
 211                 while (n != &the_lnet.ln_remote_nets && route == NULL) {
 212                         rnet = cfs_list_entry(n, lnet_remotenet_t, lrn_list);
 213
 214                         r = rnet->lrn_routes.next;
 215
 216                         while (r != &rnet->lrn_routes) {
 217                                 lnet_route_t *re =
 218                                         cfs_list_entry(r, lnet_route_t,
 219                                                        lr_list);
 220                                 if (skip == 0) {
 221                                         route = re;
 222                                         break;
 223                                 }
 224
 225                                 skip--;
 226                                 r = r->next;
 227                         }
 228
 229                         n = n->next;
 230                 }
 231
 232                 if (route != NULL) {
 233                         __u32        net   = rnet->lrn_net;
 234                         unsigned int hops  = route->lr_hops;
 235                         lnet_nid_t   nid   = route->lr_gateway->lp_nid;
 236                         int          alive = route->lr_gateway->lp_alive;
 237
 238                         s += snprintf(s, tmpstr + tmpsiz - s,
 239                                       "%-8s %4u %7s %s\n",
 240                                       libcfs_net2str(net), hops,
 241                                       alive ? "up" : "down",
 242                                       libcfs_nid2str(nid));
 243                         LASSERT(tmpstr + tmpsiz - s > 0);
 244                 }
 245
 246                 lnet_net_unlock(0);
 247         }
 248
 249         len = s - tmpstr;     /* how many bytes was written */
 250
 251         if (len > *lenp) {    /* linux-supplied buffer is too small */
 252                 rc = -EINVAL;
 253         } else if (len > 0) { /* wrote something */
 254                 if (cfs_copy_to_user(buffer, tmpstr, len))
 255                         rc = -EFAULT;
 256                 else {
 257                         off += 1;
 258                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 259                 }
 260         }
 261
 262         LIBCFS_FREE(tmpstr, tmpsiz);
 263
 264         if (rc == 0)
 265                 *lenp = len;
 266
 267         return rc;
 268 }
 269
 270 int LL_PROC_PROTO(proc_lnet_routers)
 271 {
 272         int        rc = 0;
 273         char      *tmpstr;
 274         char      *s;
 275         const int  tmpsiz = 256;
 276         int        len;
 277         int        ver;
 278         int        off;
 279
 280         DECLARE_LL_PROC_PPOS_DECL;
 281
 282         off = LNET_PROC_HOFF_GET(*ppos);
 283         ver = LNET_PROC_VER_GET(*ppos);
 284
 285         LASSERT (!write);
 286
 287         if (*lenp == 0)
 288                 return 0;
 289
 290         LIBCFS_ALLOC(tmpstr, tmpsiz);
 291         if (tmpstr == NULL)
 292                 return -ENOMEM;
 293
 294         s = tmpstr; /* points to current position in tmpstr[] */
 295
 296         if (*ppos == 0) {
 297                 s += snprintf(s, tmpstr + tmpsiz - s,
 298                               "%-4s %7s %9s %6s %12s %9s %8s %7s %s\n",
 299                               "ref", "rtr_ref", "alive_cnt", "state",
 300                               "last_ping", "ping_sent", "deadline",
 301                               "down_ni", "router");
 302                 LASSERT(tmpstr + tmpsiz - s > 0);
 303
 304                 lnet_net_lock(0);
 305                 ver = (unsigned int)the_lnet.ln_routers_version;
 306                 lnet_net_unlock(0);
 307                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 308         } else {
 309                 cfs_list_t              *r;
 310                 struct lnet_peer        *peer = NULL;
 311                 int                     skip = off - 1;
 312
 313                 lnet_net_lock(0);
 314
 315                 if (ver != LNET_PROC_VERSION(the_lnet.ln_routers_version)) {
 316                         lnet_net_unlock(0);
 317
 318                         LIBCFS_FREE(tmpstr, tmpsiz);
 319                         return -ESTALE;
 320                 }
 321
 322                 r = the_lnet.ln_routers.next;
 323
 324                 while (r != &the_lnet.ln_routers) {
 325                         lnet_peer_t *lp = cfs_list_entry(r, lnet_peer_t,
 326                                                          lp_rtr_list);
 327
 328                         if (skip == 0) {
 329                                 peer = lp;
 330                                 break;
 331                         }
 332
 333                         skip--;
 334                         r = r->next;
 335                 }
 336
 337                 if (peer != NULL) {
 338                         lnet_nid_t nid = peer->lp_nid;
 339                         cfs_time_t now = cfs_time_current();
 340                         cfs_time_t deadline = peer->lp_ping_deadline;
 341                         int nrefs     = peer->lp_refcount;
 342                         int nrtrrefs  = peer->lp_rtr_refcount;
 343                         int alive_cnt = peer->lp_alive_count;
 344                         int alive     = peer->lp_alive;
 345                         int pingsent  = !peer->lp_ping_notsent;
 346                         int last_ping = cfs_duration_sec(cfs_time_sub(now,
 347                                                      peer->lp_ping_timestamp));
 348                         int down_ni   = 0;
 349                         lnet_route_t *rtr;
 350
 351                         if ((peer->lp_ping_feats &
 352                              LNET_PING_FEAT_NI_STATUS) != 0) {
 353                                 cfs_list_for_each_entry(rtr, &peer->lp_routes,
 354                                                         lr_gwlist) {
 355                                         /* downis on any route should be the
 356                                          * number of downis on the gateway */
 357                                         if (rtr->lr_downis != 0) {
 358                                                 down_ni = rtr->lr_downis;
 359                                                 break;
 360                                         }
 361                                 }
 362                         }
 363
 364                         if (deadline == 0)
 365                                 s += snprintf(s, tmpstr + tmpsiz - s,
 366                                               "%-4d %7d %9d %6s %12d %9d %8s %7d %s\n",
 367                                               nrefs, nrtrrefs, alive_cnt,
 368                                               alive ? "up" : "down", last_ping,
 369                                               pingsent, "NA", down_ni,
 370                                               libcfs_nid2str(nid));
 371                         else
 372                                 s += snprintf(s, tmpstr + tmpsiz - s,
 373                                               "%-4d %7d %9d %6s %12d %9d %8lu %7d %s\n",
 374                                               nrefs, nrtrrefs, alive_cnt,
 375                                               alive ? "up" : "down", last_ping,
 376                                               pingsent,
 377                                               cfs_duration_sec(cfs_time_sub(deadline, now)),
 378                                               down_ni, libcfs_nid2str(nid));
 379                         LASSERT (tmpstr + tmpsiz - s > 0);
 380                 }
 381
 382                 lnet_net_unlock(0);
 383         }
 384
 385         len = s - tmpstr;     /* how many bytes was written */
 386
 387         if (len > *lenp) {    /* linux-supplied buffer is too small */
 388                 rc = -EINVAL;
 389         } else if (len > 0) { /* wrote something */
 390                 if (cfs_copy_to_user(buffer, tmpstr, len))
 391                         rc = -EFAULT;
 392                 else {
 393                         off += 1;
 394                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 395                 }
 396         }
 397
 398         LIBCFS_FREE(tmpstr, tmpsiz);
 399
 400         if (rc == 0)
 401                 *lenp = len;
 402
 403         return rc;
 404 }
 405
 406 int LL_PROC_PROTO(proc_lnet_peers)
 407 {
 408         const int               tmpsiz  = 256;
 409         struct lnet_peer_table  *ptable;
 410         char                    *tmpstr;
 411         char                    *s;
 412         int                     cpt  = LNET_PROC_CPT_GET(*ppos);
 413         int                     ver  = LNET_PROC_VER_GET(*ppos);
 414         int                     hoff = LNET_PROC_HOFF_GET(*ppos);
 415         int                     hash = LNET_PROC_HASH_GET(*ppos);
 416         int                     rc = 0;
 417         int                     len;
 418
 419         CLASSERT(LNET_PROC_HASH_BITS >= LNET_PEER_HASH_BITS);
 420         LASSERT(!write);
 421
 422         if (*lenp == 0)
 423                 return 0;
 424
 425         if (cpt >= LNET_CPT_NUMBER)
 426                 return 0;
 427
 428         LIBCFS_ALLOC(tmpstr, tmpsiz);
 429         if (tmpstr == NULL)
 430                 return -ENOMEM;
 431
 432         s = tmpstr; /* points to current position in tmpstr[] */
 433
 434         if (*ppos == 0) {
 435                 s += snprintf(s, tmpstr + tmpsiz - s,
 436                               "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 437                               "nid", "refs", "state", "last", "max",
 438                               "rtr", "min", "tx", "min", "queue");
 439                 LASSERT (tmpstr + tmpsiz - s > 0);
 440
 441                 hoff++;
 442         } else {
 443                 struct lnet_peer        *peer   = NULL;
 444                 cfs_list_t              *p      = NULL;
 445                 int                     skip    = hoff - 1;
 446
 447  again:
 448                 lnet_net_lock(cpt);
 449                 ptable = the_lnet.ln_peer_tables[cpt];
 450                 if (hoff == 1)
 451                         ver = LNET_PROC_VERSION(ptable->pt_version);
 452
 453                 if (ver != LNET_PROC_VERSION(ptable->pt_version)) {
 454                         lnet_net_unlock(cpt);
 455                         LIBCFS_FREE(tmpstr, tmpsiz);
 456                         return -ESTALE;
 457                 }
 458
 459                 while (hash < LNET_PEER_HASH_SIZE) {
 460                         if (p == NULL)
 461                                 p = ptable->pt_hash[hash].next;
 462
 463                         while (p != &ptable->pt_hash[hash]) {
 464                                 lnet_peer_t *lp = cfs_list_entry(p, lnet_peer_t,
 465                                                                  lp_hashlist);
 466                                 if (skip == 0) {
 467                                         peer = lp;
 468
 469                                         /* minor optimization: start from idx+1
 470                                          * on next iteration if we've just
 471                                          * drained lp_hashlist */
 472                                         if (lp->lp_hashlist.next ==
 473                                             &ptable->pt_hash[hash]) {
 474                                                 hoff = 1;
 475                                                 hash++;
 476                                         } else {
 477                                                 hoff++;
 478                                         }
 479
 480                                         break;
 481                                 }
 482
 483                                 skip--;
 484                                 p = lp->lp_hashlist.next;
 485                         }
 486
 487                         if (peer != NULL)
 488                                 break;
 489
 490                         p = NULL;
 491                         hoff = 1;
 492                         hash++;
 493                 }
 494
 495                 if (peer != NULL) {
 496                         lnet_nid_t nid       = peer->lp_nid;
 497                         int        nrefs     = peer->lp_refcount;
 498                         int        lastalive = -1;
 499                         char      *aliveness = "NA";
 500                         int        maxcr     = peer->lp_ni->ni_peertxcredits;
 501                         int        txcr      = peer->lp_txcredits;
 502                         int        mintxcr   = peer->lp_mintxcredits;
 503                         int        rtrcr     = peer->lp_rtrcredits;
 504                         int        minrtrcr  = peer->lp_minrtrcredits;
 505                         int        txqnob    = peer->lp_txqnob;
 506
 507                         if (lnet_isrouter(peer) ||
 508                             lnet_peer_aliveness_enabled(peer))
 509                                 aliveness = peer->lp_alive ? "up" : "down";
 510
 511                         if (lnet_peer_aliveness_enabled(peer)) {
 512                                 cfs_time_t     now = cfs_time_current();
 513                                 cfs_duration_t delta;
 514
 515                                 delta = cfs_time_sub(now, peer->lp_last_alive);
 516                                 lastalive = cfs_duration_sec(delta);
 517
 518                                 /* No need to mess up peers contents with
 519                                  * arbitrarily long integers - it suffices to
 520                                  * know that lastalive is more than 10000s old
 521                                  */
 522                                 if (lastalive >= 10000)
 523                                         lastalive = 9999;
 524                         }
 525
 526                         lnet_net_unlock(cpt);
 527
 528                         s += snprintf(s, tmpstr + tmpsiz - s,
 529                                       "%-24s %4d %5s %5d %5d %5d %5d %5d %5d %d\n",
 530                                       libcfs_nid2str(nid), nrefs, aliveness,
 531                                       lastalive, maxcr, rtrcr, minrtrcr, txcr,
 532                                       mintxcr, txqnob);
 533                         LASSERT (tmpstr + tmpsiz - s > 0);
 534
 535                 } else { /* peer is NULL */
 536                         lnet_net_unlock(cpt);
 537
 538                         if (hash == LNET_PEER_HASH_SIZE &&
 539                             cpt < LNET_CPT_NUMBER - 1) {
 540                                 cpt++;
 541                                 hash = 0;
 542                                 hoff = 1;
 543                                 goto again;
 544                         }
 545                 }
 546         }
 547
 548         len = s - tmpstr;     /* how many bytes was written */
 549
 550         if (len > *lenp) {    /* linux-supplied buffer is too small */
 551                 rc = -EINVAL;
 552         } else if (len > 0) { /* wrote something */
 553                 if (cfs_copy_to_user(buffer, tmpstr, len))
 554                         rc = -EFAULT;
 555                 else
 556                         *ppos = LNET_PROC_POS_MAKE(cpt, ver, hash, hoff);
 557         }
 558
 559         LIBCFS_FREE(tmpstr, tmpsiz);
 560
 561         if (rc == 0)
 562                 *lenp = len;
 563
 564         return rc;
 565 }
 566
 567 static int __proc_lnet_buffers(void *data, int write,
 568                                loff_t pos, void *buffer, int nob)
 569 {
 570         char            *s;
 571         char            *tmpstr;
 572         int             tmpsiz;
 573         int             idx;
 574         int             len;
 575         int             rc;
 576         int             i;
 577
 578         LASSERT(!write);
 579
 580         /* (4 %d) * 4 * LNET_CPT_NUMBER */
 581         tmpsiz = 64 * (LNET_NRBPOOLS + 1) * LNET_CPT_NUMBER;
 582         LIBCFS_ALLOC(tmpstr, tmpsiz);
 583         if (tmpstr == NULL)
 584                 return -ENOMEM;
 585
 586         s = tmpstr; /* points to current position in tmpstr[] */
 587
 588         s += snprintf(s, tmpstr + tmpsiz - s,
 589                       "%5s %5s %7s %7s\n",
 590                       "pages", "count", "credits", "min");
 591         LASSERT (tmpstr + tmpsiz - s > 0);
 592
 593         if (the_lnet.ln_rtrpools == NULL)
 594                 goto out; /* I'm not a router */
 595
 596         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 597                 lnet_rtrbufpool_t *rbp;
 598
 599                 lnet_net_lock(LNET_LOCK_EX);
 600                 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 601                         s += snprintf(s, tmpstr + tmpsiz - s,
 602                                       "%5d %5d %7d %7d\n",
 603                                       rbp[idx].rbp_npages,
 604                                       rbp[idx].rbp_nbuffers,
 605                                       rbp[idx].rbp_credits,
 606                                       rbp[idx].rbp_mincredits);
 607                         LASSERT(tmpstr + tmpsiz - s > 0);
 608                 }
 609                 lnet_net_unlock(LNET_LOCK_EX);
 610         }
 611
 612  out:
 613         len = s - tmpstr;
 614
 615         if (pos >= min_t(int, len, strlen(tmpstr)))
 616                 rc = 0;
 617         else
 618                 rc = cfs_trace_copyout_string(buffer, nob,
 619                                               tmpstr + pos, NULL);
 620
 621         LIBCFS_FREE(tmpstr, tmpsiz);
 622         return rc;
 623 }
 624
 625 DECLARE_PROC_HANDLER(proc_lnet_buffers);
 626
 627 int LL_PROC_PROTO(proc_lnet_nis)
 628 {
 629         int     tmpsiz = 128 * LNET_CPT_NUMBER;
 630         int        rc = 0;
 631         char      *tmpstr;
 632         char      *s;
 633         int        len;
 634
 635         DECLARE_LL_PROC_PPOS_DECL;
 636
 637         LASSERT (!write);
 638
 639         if (*lenp == 0)
 640                 return 0;
 641
 642         LIBCFS_ALLOC(tmpstr, tmpsiz);
 643         if (tmpstr == NULL)
 644                 return -ENOMEM;
 645
 646         s = tmpstr; /* points to current position in tmpstr[] */
 647
 648         if (*ppos == 0) {
 649                 s += snprintf(s, tmpstr + tmpsiz - s,
 650                               "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 651                               "nid", "status", "alive", "refs", "peer",
 652                               "rtr", "max", "tx", "min");
 653                 LASSERT (tmpstr + tmpsiz - s > 0);
 654         } else {
 655                 cfs_list_t        *n;
 656                 lnet_ni_t         *ni   = NULL;
 657                 int                skip = *ppos - 1;
 658
 659                 lnet_net_lock(0);
 660
 661                 n = the_lnet.ln_nis.next;
 662
 663                 while (n != &the_lnet.ln_nis) {
 664                         lnet_ni_t *a_ni = cfs_list_entry(n, lnet_ni_t, ni_list);
 665
 666                         if (skip == 0) {
 667                                 ni = a_ni;
 668                                 break;
 669                         }
 670
 671                         skip--;
 672                         n = n->next;
 673                 }
 674
 675                 if (ni != NULL) {
 676                         struct lnet_tx_queue    *tq;
 677                         char    *stat;
 678                         long    now = cfs_time_current_sec();
 679                         int     last_alive = -1;
 680                         int     i;
 681                         int     j;
 682
 683                         if (the_lnet.ln_routing)
 684                                 last_alive = now - ni->ni_last_alive;
 685
 686                         /* @lo forever alive */
 687                         if (ni->ni_lnd->lnd_type == LOLND)
 688                                 last_alive = 0;
 689
 690                         lnet_ni_lock(ni);
 691                         LASSERT(ni->ni_status != NULL);
 692                         stat = (ni->ni_status->ns_status ==
 693                                 LNET_NI_STATUS_UP) ? "up" : "down";
 694                         lnet_ni_unlock(ni);
 695
 696                         /* we actually output credits information for
 697                          * TX queue of each partition */
 698                         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 699                                 for (j = 0; ni->ni_cpts != NULL &&
 700                                      j < ni->ni_ncpts; j++) {
 701                                         if (i == ni->ni_cpts[j])
 702                                                 break;
 703                                 }
 704
 705                                 if (j == ni->ni_ncpts)
 706                                         continue;
 707
 708                                 if (i != 0)
 709                                         lnet_net_lock(i);
 710
 711                                 s += snprintf(s, tmpstr + tmpsiz - s,
 712                                       "%-24s %6s %5d %4d %4d %4d %5d %5d %5d\n",
 713                                       libcfs_nid2str(ni->ni_nid), stat,
 714                                       last_alive, *ni->ni_refs[i],
 715                                       ni->ni_peertxcredits,
 716                                       ni->ni_peerrtrcredits,
 717                                       tq->tq_credits_max,
 718                                       tq->tq_credits, tq->tq_credits_min);
 719                                 if (i != 0)
 720                                         lnet_net_unlock(i);
 721                         }
 722                         LASSERT(tmpstr + tmpsiz - s > 0);
 723                 }
 724
 725                 lnet_net_unlock(0);
 726         }
 727
 728         len = s - tmpstr;     /* how many bytes was written */
 729
 730         if (len > *lenp) {    /* linux-supplied buffer is too small */
 731                 rc = -EINVAL;
 732         } else if (len > 0) { /* wrote something */
 733                 if (cfs_copy_to_user(buffer, tmpstr, len))
 734                         rc = -EFAULT;
 735                 else
 736                         *ppos += 1;
 737         }
 738
 739         LIBCFS_FREE(tmpstr, tmpsiz);
 740
 741         if (rc == 0)
 742                 *lenp = len;
 743
 744         return rc;
 745 }
 746
 747 static cfs_sysctl_table_t lnet_table[] = {
 748         /*
 749          * NB No .strategy entries have been provided since sysctl(8) prefers
 750          * to go via /proc for portability.
 751          */
 752         {
 753                 INIT_CTL_NAME(PSDEV_LNET_STATS)
 754                 .procname = "stats",
 755                 .mode     = 0644,
 756                 .proc_handler = &proc_lnet_stats,
 757         },
 758         {
 759                 INIT_CTL_NAME(PSDEV_LNET_ROUTES)
 760                 .procname = "routes",
 761                 .mode     = 0444,
 762                 .proc_handler = &proc_lnet_routes,
 763         },
 764         {
 765                 INIT_CTL_NAME(PSDEV_LNET_ROUTERS)
 766                 .procname = "routers",
 767                 .mode     = 0444,
 768                 .proc_handler = &proc_lnet_routers,
 769         },
 770         {
 771                 INIT_CTL_NAME(PSDEV_LNET_PEERS)
 772                 .procname = "peers",
 773                 .mode     = 0444,
 774                 .proc_handler = &proc_lnet_peers,
 775         },
 776         {
 777                 INIT_CTL_NAME(PSDEV_LNET_PEERS)
 778                 .procname = "buffers",
 779                 .mode     = 0444,
 780                 .proc_handler = &proc_lnet_buffers,
 781         },
 782         {
 783                 INIT_CTL_NAME(PSDEV_LNET_NIS)
 784                 .procname = "nis",
 785                 .mode     = 0444,
 786                 .proc_handler = &proc_lnet_nis,
 787         },
 788         {
 789                 INIT_CTL_NAME(0)
 790         }
 791 };
 792
 793 static cfs_sysctl_table_t top_table[] = {
 794         {
 795                 INIT_CTL_NAME(CTL_LNET)
 796                 .procname = "lnet",
 797                 .mode     = 0555,
 798                 .data     = NULL,
 799                 .maxlen   = 0,
 800                 .child    = lnet_table,
 801         },
 802         {
 803                 INIT_CTL_NAME(0)
 804         }
 805 };
 806
 807 void
 808 lnet_proc_init(void)
 809 {
 810 #ifdef CONFIG_SYSCTL
 811         if (lnet_table_header == NULL)
 812                 lnet_table_header = cfs_register_sysctl_table(top_table, 0);
 813 #endif
 814 }
 815
 816 void
 817 lnet_proc_fini(void)
 818 {
 819 #ifdef CONFIG_SYSCTL
 820         if (lnet_table_header != NULL)
 821                 cfs_unregister_sysctl_table(lnet_table_header);
 822
 823         lnet_table_header = NULL;
 824 #endif
 825 }
 826
 827 #else
 828
 829 void
 830 lnet_proc_init(void)
 831 {
 832 }
 833
 834 void
 835 lnet_proc_fini(void)
 836 {
 837 }
 838
 839 #endif