lnet/lnet/router_proc.c

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