lnet/lnet/lnet_debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   4  *
   5  * Copyright (c) 2011, 2017, Intel Corporation.
   6  */
   7
   8 /* This file is part of Lustre, http://www.lustre.org/ */
   9
  10 #define DEBUG_SUBSYSTEM S_LNET
  11
  12 #include <linux/uaccess.h>
  13
  14 #include <libcfs/libcfs.h>
  15 #include <lnet/lib-lnet.h>
  16
  17 #define LNET_LOFFT_BITS         (sizeof(loff_t) * 8)
  18 /* NB: max allowed LNET_CPT_BITS is 8 on 64-bit system and 2 on 32-bit system
  19  */
  20 #define LNET_PROC_CPT_BITS      (LNET_CPT_BITS + 1)
  21 /* change version, 16 bits or 8 bits */
  22 #define LNET_PROC_VER_BITS              \
  23         clamp_t(int, LNET_LOFFT_BITS / 4, 8, 16)
  24
  25 #define LNET_PROC_HASH_BITS     LNET_PEER_HASH_BITS
  26 /* bits for peer hash offset
  27  * NB: we don't use the highest bit of *ppos because it's signed
  28  */
  29 #define LNET_PROC_HOFF_BITS     (LNET_LOFFT_BITS -       \
  30                                  LNET_PROC_CPT_BITS -    \
  31                                  LNET_PROC_VER_BITS -    \
  32                                  LNET_PROC_HASH_BITS - 1)
  33 /* bits for hash index + position */
  34 #define LNET_PROC_HPOS_BITS     (LNET_PROC_HASH_BITS + LNET_PROC_HOFF_BITS)
  35 /* bits for peer hash table + hash version */
  36 #define LNET_PROC_VPOS_BITS     (LNET_PROC_HPOS_BITS + LNET_PROC_VER_BITS)
  37
  38 #define LNET_PROC_CPT_MASK      ((1ULL << LNET_PROC_CPT_BITS) - 1)
  39 #define LNET_PROC_VER_MASK      ((1ULL << LNET_PROC_VER_BITS) - 1)
  40 #define LNET_PROC_HASH_MASK     ((1ULL << LNET_PROC_HASH_BITS) - 1)
  41 #define LNET_PROC_HOFF_MASK     ((1ULL << LNET_PROC_HOFF_BITS) - 1)
  42
  43 #define LNET_PROC_CPT_GET(pos)                          \
  44         (int)(((pos) >> LNET_PROC_VPOS_BITS) & LNET_PROC_CPT_MASK)
  45
  46 #define LNET_PROC_VER_GET(pos)                          \
  47         (int)(((pos) >> LNET_PROC_HPOS_BITS) & LNET_PROC_VER_MASK)
  48
  49 #define LNET_PROC_HASH_GET(pos)                         \
  50         (int)(((pos) >> LNET_PROC_HOFF_BITS) & LNET_PROC_HASH_MASK)
  51
  52 #define LNET_PROC_HOFF_GET(pos)                         \
  53         (int)((pos) & LNET_PROC_HOFF_MASK)
  54
  55 #define LNET_PROC_POS_MAKE(cpt, ver, hash, off)         \
  56         (((((loff_t)(cpt)) & LNET_PROC_CPT_MASK) << LNET_PROC_VPOS_BITS) |   \
  57         ((((loff_t)(ver)) & LNET_PROC_VER_MASK) << LNET_PROC_HPOS_BITS) |   \
  58         ((((loff_t)(hash)) & LNET_PROC_HASH_MASK) << LNET_PROC_HOFF_BITS) | \
  59         ((off) & LNET_PROC_HOFF_MASK))
  60
  61 #define LNET_PROC_VERSION(v)    ((unsigned int)((v) & LNET_PROC_VER_MASK))
  62
  63 static int proc_cpt_table(struct ctl_table *table, int write,
  64                           void __user *buffer, size_t *lenp, loff_t *ppos)
  65 {
  66         size_t nob = *lenp;
  67         loff_t pos = *ppos;
  68         char *buf = NULL;
  69         int len = 4096;
  70         int rc  = 0;
  71
  72         if (write)
  73                 return -EPERM;
  74
  75         while (1) {
  76                 LIBCFS_ALLOC(buf, len);
  77                 if (!buf)
  78                         return -ENOMEM;
  79
  80                 rc = cfs_cpt_table_print(cfs_cpt_tab, buf, len);
  81                 if (rc >= 0)
  82                         break;
  83
  84                 if (rc == -EFBIG) {
  85                         LIBCFS_FREE(buf, len);
  86                         len <<= 1;
  87                         continue;
  88                 }
  89                 goto out;
  90         }
  91
  92         if (pos >= rc) {
  93                 rc = 0;
  94                 goto out;
  95         }
  96
  97         rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
  98 out:
  99         if (buf)
 100                 LIBCFS_FREE(buf, len);
 101         return rc;
 102 }
 103
 104 static int proc_cpt_distance(struct ctl_table *table, int write,
 105                              void __user *buffer, size_t *lenp, loff_t *ppos)
 106 {
 107         size_t nob = *lenp;
 108         loff_t pos = *ppos;
 109         char *buf = NULL;
 110         int len = 4096;
 111         int rc  = 0;
 112
 113         if (write)
 114                 return -EPERM;
 115
 116         while (1) {
 117                 LIBCFS_ALLOC(buf, len);
 118                 if (!buf)
 119                         return -ENOMEM;
 120
 121                 rc = cfs_cpt_distance_print(cfs_cpt_tab, buf, len);
 122                 if (rc >= 0)
 123                         break;
 124
 125                 if (rc == -EFBIG) {
 126                         LIBCFS_FREE(buf, len);
 127                         len <<= 1;
 128                         continue;
 129                 }
 130                 goto out;
 131         }
 132
 133         if (pos >= rc) {
 134                 rc = 0;
 135                 goto out;
 136         }
 137
 138         rc = cfs_trace_copyout_string(buffer, nob, buf + pos, NULL);
 139 out:
 140         if (buf)
 141                 LIBCFS_FREE(buf, len);
 142         return rc;
 143 }
 144
 145 static int proc_lnet_stats(struct ctl_table *table, int write,
 146                            void __user *buffer, size_t *lenp, loff_t *ppos)
 147 {
 148         int rc;
 149         struct lnet_counters *ctrs;
 150         struct lnet_counters_common common;
 151         size_t nob = *lenp;
 152         loff_t pos = *ppos;
 153         int len;
 154         char tmpstr[256]; /* 7 %u and 4 u64 */
 155
 156         if (write) {
 157                 lnet_counters_reset();
 158                 return 0;
 159         }
 160
 161         /* read */
 162
 163         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
 164         if (ctrs == NULL)
 165                 return -ENOMEM;
 166
 167         rc = lnet_counters_get(ctrs);
 168         if (rc)
 169                 goto out_no_ctrs;
 170
 171         common = ctrs->lct_common;
 172
 173         len = scnprintf(tmpstr, sizeof(tmpstr),
 174                         "%u %u %u %u %u %u %u %llu %llu "
 175                         "%llu %llu",
 176                         common.lcc_msgs_alloc, common.lcc_msgs_max,
 177                         common.lcc_errors,
 178                         common.lcc_send_count, common.lcc_recv_count,
 179                         common.lcc_route_count, common.lcc_drop_count,
 180                         common.lcc_send_length, common.lcc_recv_length,
 181                         common.lcc_route_length, common.lcc_drop_length);
 182
 183         if (pos >= len)
 184                 rc = 0;
 185         else
 186                 rc = cfs_trace_copyout_string(buffer, nob,
 187                                               tmpstr + pos, "\n");
 188 out_no_ctrs:
 189         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 190         return rc;
 191 }
 192
 193 static int
 194 proc_lnet_routes(struct ctl_table *table, int write, void __user *buffer,
 195                  size_t *lenp, loff_t *ppos)
 196 {
 197         const int       tmpsiz = 256;
 198         char            *tmpstr;
 199         char            *s;
 200         int             rc = 0;
 201         int             len;
 202         int             ver;
 203         int             off;
 204
 205         BUILD_BUG_ON(sizeof(loff_t) < 4);
 206
 207         off = LNET_PROC_HOFF_GET(*ppos);
 208         ver = LNET_PROC_VER_GET(*ppos);
 209
 210         LASSERT(!write);
 211
 212         if (*lenp == 0)
 213                 return 0;
 214
 215         LIBCFS_ALLOC(tmpstr, tmpsiz);
 216         if (tmpstr == NULL)
 217                 return -ENOMEM;
 218
 219         s = tmpstr; /* points to current position in tmpstr[] */
 220
 221         if (*ppos == 0) {
 222                 s += scnprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 223                                the_lnet.ln_routing ? "enabled" : "disabled");
 224                 LASSERT(tmpstr + tmpsiz - s > 0);
 225
 226                 s += scnprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %8s %7s %s\n",
 227                                "net", "hops", "priority", "state", "router");
 228                 LASSERT(tmpstr + tmpsiz - s > 0);
 229
 230                 lnet_net_lock(0);
 231                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 232                 lnet_net_unlock(0);
 233                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 234         } else {
 235                 struct list_head        *n;
 236                 struct list_head        *r;
 237                 struct lnet_route               *route = NULL;
 238                 struct lnet_remotenet   *rnet  = NULL;
 239                 int                     skip  = off - 1;
 240                 struct list_head        *rn_list;
 241                 int                     i;
 242
 243                 lnet_net_lock(0);
 244
 245                 if (ver != LNET_PROC_VERSION(the_lnet.ln_remote_nets_version)) {
 246                         lnet_net_unlock(0);
 247                         LIBCFS_FREE(tmpstr, tmpsiz);
 248                         return -ESTALE;
 249                 }
 250
 251                 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE && route == NULL;
 252                      i++) {
 253                         rn_list = &the_lnet.ln_remote_nets_hash[i];
 254
 255                         n = rn_list->next;
 256
 257                         while (n != rn_list && route == NULL) {
 258                                 rnet = list_entry(n, struct lnet_remotenet,
 259                                                   lrn_list);
 260
 261                                 r = rnet->lrn_routes.next;
 262
 263                                 while (r != &rnet->lrn_routes) {
 264                                         struct lnet_route *re =
 265                                                 list_entry(r, struct lnet_route,
 266                                                            lr_list);
 267                                         if (skip == 0) {
 268                                                 route = re;
 269                                                 break;
 270                                         }
 271
 272                                         skip--;
 273                                         r = r->next;
 274                                 }
 275
 276                                 n = n->next;
 277                         }
 278                 }
 279
 280                 if (route != NULL) {
 281                         __u32 net = rnet->lrn_net;
 282                         __u32 hops = route->lr_hops;
 283                         unsigned int priority = route->lr_priority;
 284                         int alive = lnet_is_route_alive(route);
 285
 286                         s += scnprintf(s, tmpstr + tmpsiz - s,
 287                                        "%-8s %4d %8u %7s %s\n",
 288                                        libcfs_net2str(net), hops,
 289                                        priority,
 290                                        alive ? "up" : "down",
 291                                        libcfs_nidstr(&route->lr_nid));
 292                         LASSERT(tmpstr + tmpsiz - s > 0);
 293                 }
 294
 295                 lnet_net_unlock(0);
 296         }
 297
 298         len = s - tmpstr;     /* how many bytes was written */
 299
 300         if (len > *lenp) {    /* linux-supplied buffer is too small */
 301                 rc = -EINVAL;
 302         } else if (len > 0) { /* wrote something */
 303                 if (copy_to_user(buffer, tmpstr, len))
 304                         rc = -EFAULT;
 305                 else {
 306                         off += 1;
 307                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 308                 }
 309         }
 310
 311         LIBCFS_FREE(tmpstr, tmpsiz);
 312
 313         if (rc == 0)
 314                 *lenp = len;
 315
 316         return rc;
 317 }
 318
 319 static int
 320 proc_lnet_routers(struct ctl_table *table, int write, void __user *buffer,
 321                   size_t *lenp, loff_t *ppos)
 322 {
 323         int        rc = 0;
 324         char      *tmpstr;
 325         char      *s;
 326         const int  tmpsiz = 256;
 327         int        len;
 328         int        ver;
 329         int        off;
 330
 331         off = LNET_PROC_HOFF_GET(*ppos);
 332         ver = LNET_PROC_VER_GET(*ppos);
 333
 334         LASSERT(!write);
 335
 336         if (*lenp == 0)
 337                 return 0;
 338
 339         LIBCFS_ALLOC(tmpstr, tmpsiz);
 340         if (tmpstr == NULL)
 341                 return -ENOMEM;
 342
 343         s = tmpstr; /* points to current position in tmpstr[] */
 344
 345         if (*ppos == 0) {
 346                 s += scnprintf(s, tmpstr + tmpsiz - s,
 347                                "%-4s %7s %5s %s\n",
 348                                "ref", "rtr_ref", "alive", "router");
 349                 LASSERT(tmpstr + tmpsiz - s > 0);
 350
 351                 lnet_net_lock(0);
 352                 ver = (unsigned int)the_lnet.ln_routers_version;
 353                 lnet_net_unlock(0);
 354                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 355         } else {
 356                 struct list_head *r;
 357                 struct lnet_peer *peer = NULL;
 358                 int               skip = off - 1;
 359
 360                 lnet_net_lock(0);
 361
 362                 if (ver != LNET_PROC_VERSION(the_lnet.ln_routers_version)) {
 363                         lnet_net_unlock(0);
 364
 365                         LIBCFS_FREE(tmpstr, tmpsiz);
 366                         return -ESTALE;
 367                 }
 368
 369                 r = the_lnet.ln_routers.next;
 370
 371                 while (r != &the_lnet.ln_routers) {
 372                         struct lnet_peer *lp =
 373                           list_entry(r, struct lnet_peer,
 374                                      lp_rtr_list);
 375
 376                         if (skip == 0) {
 377                                 peer = lp;
 378                                 break;
 379                         }
 380
 381                         skip--;
 382                         r = r->next;
 383                 }
 384
 385                 if (peer != NULL) {
 386                         struct lnet_nid *nid = &peer->lp_primary_nid;
 387                         int nrefs     = atomic_read(&peer->lp_refcount);
 388                         int nrtrrefs  = peer->lp_rtr_refcount;
 389                         int alive     = lnet_is_gateway_alive(peer);
 390
 391                         s += scnprintf(s, tmpstr + tmpsiz - s,
 392                                        "%-4d %7d %5s %s\n",
 393                                        nrefs, nrtrrefs,
 394                                        alive ? "up" : "down",
 395                                        libcfs_nidstr(nid));
 396                 }
 397
 398                 lnet_net_unlock(0);
 399         }
 400
 401         len = s - tmpstr;     /* how many bytes was written */
 402
 403         if (len > *lenp) {    /* linux-supplied buffer is too small */
 404                 rc = -EINVAL;
 405         } else if (len > 0) { /* wrote something */
 406                 if (copy_to_user(buffer, tmpstr, len))
 407                         rc = -EFAULT;
 408                 else {
 409                         off += 1;
 410                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 411                 }
 412         }
 413
 414         LIBCFS_FREE(tmpstr, tmpsiz);
 415
 416         if (rc == 0)
 417                 *lenp = len;
 418
 419         return rc;
 420 }
 421
 422 /* TODO: there should be no direct access to ptable. We should add a set
 423  * of APIs that give access to the ptable and its members */
 424 static int
 425 proc_lnet_peers(struct ctl_table *table, int write, void __user *buffer,
 426                 size_t *lenp, loff_t *ppos)
 427 {
 428         const int               tmpsiz  = 256;
 429         struct lnet_peer_table  *ptable;
 430         char                    *tmpstr = NULL;
 431         char                    *s;
 432         int                     cpt  = LNET_PROC_CPT_GET(*ppos);
 433         int                     ver  = LNET_PROC_VER_GET(*ppos);
 434         int                     hash = LNET_PROC_HASH_GET(*ppos);
 435         int                     hoff = LNET_PROC_HOFF_GET(*ppos);
 436         int                     rc = 0;
 437         int                     len;
 438
 439         if (write) {
 440                 int i;
 441                 struct lnet_peer_ni *peer;
 442
 443                 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
 444                         lnet_net_lock(i);
 445                         for (hash = 0; hash < LNET_PEER_HASH_SIZE; hash++) {
 446                                 list_for_each_entry(peer,
 447                                                     &ptable->pt_hash[hash],
 448                                                     lpni_hashlist) {
 449                                         peer->lpni_mintxcredits =
 450                                                 peer->lpni_txcredits;
 451                                         peer->lpni_minrtrcredits =
 452                                                 peer->lpni_rtrcredits;
 453                                 }
 454                         }
 455                         lnet_net_unlock(i);
 456                 }
 457                 *ppos += *lenp;
 458                 return 0;
 459         }
 460
 461         if (*lenp == 0)
 462                 return 0;
 463
 464         BUILD_BUG_ON(LNET_PROC_HASH_BITS < LNET_PEER_HASH_BITS);
 465
 466         if (cpt >= LNET_CPT_NUMBER) {
 467                 *lenp = 0;
 468                 return 0;
 469         }
 470
 471         LIBCFS_ALLOC(tmpstr, tmpsiz);
 472         if (tmpstr == NULL)
 473                 return -ENOMEM;
 474
 475         s = tmpstr; /* points to current position in tmpstr[] */
 476
 477         if (*ppos == 0) {
 478                 s += scnprintf(s, tmpstr + tmpsiz - s,
 479                                "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 480                                "nid", "refs", "state", "last", "max",
 481                                "rtr", "min", "tx", "min", "queue");
 482                 LASSERT(tmpstr + tmpsiz - s > 0);
 483
 484                 hoff++;
 485         } else {
 486                 struct lnet_peer_ni     *peer;
 487                 struct list_head        *p;
 488                 int                     skip;
 489
 490  again:
 491                 p = NULL;
 492                 peer = NULL;
 493                 skip = hoff - 1;
 494
 495                 lnet_net_lock(cpt);
 496                 ptable = the_lnet.ln_peer_tables[cpt];
 497                 if (hoff == 1)
 498                         ver = LNET_PROC_VERSION(ptable->pt_version);
 499
 500                 if (ver != LNET_PROC_VERSION(ptable->pt_version)) {
 501                         lnet_net_unlock(cpt);
 502                         LIBCFS_FREE(tmpstr, tmpsiz);
 503                         return -ESTALE;
 504                 }
 505
 506                 while (hash < LNET_PEER_HASH_SIZE) {
 507                         if (p == NULL)
 508                                 p = ptable->pt_hash[hash].next;
 509
 510                         while (p != &ptable->pt_hash[hash]) {
 511                                 struct lnet_peer_ni *lp =
 512                                   list_entry(p, struct lnet_peer_ni,
 513                                              lpni_hashlist);
 514                                 if (skip == 0) {
 515                                         peer = lp;
 516
 517                                         /* minor optimization: start from idx+1
 518                                          * on next iteration if we've just
 519                                          * drained lpni_hashlist */
 520                                         if (lp->lpni_hashlist.next ==
 521                                             &ptable->pt_hash[hash]) {
 522                                                 hoff = 1;
 523                                                 hash++;
 524                                         } else {
 525                                                 hoff++;
 526                                         }
 527
 528                                         break;
 529                                 }
 530
 531                                 skip--;
 532                                 p = lp->lpni_hashlist.next;
 533                         }
 534
 535                         if (peer != NULL)
 536                                 break;
 537
 538                         p = NULL;
 539                         hoff = 1;
 540                         hash++;
 541                 }
 542
 543                 if (peer != NULL) {
 544                         struct lnet_nid nid = peer->lpni_nid;
 545                         int nrefs = kref_read(&peer->lpni_kref);
 546                         time64_t lastalive = -1;
 547                         char *aliveness = "NA";
 548                         int maxcr = (peer->lpni_net) ?
 549                           peer->lpni_net->net_tunables.lct_peer_tx_credits : 0;
 550                         int txcr = peer->lpni_txcredits;
 551                         int mintxcr = peer->lpni_mintxcredits;
 552                         int rtrcr = peer->lpni_rtrcredits;
 553                         int minrtrcr = peer->lpni_minrtrcredits;
 554                         int txqnob = peer->lpni_txqnob;
 555
 556                         if (lnet_isrouter(peer) ||
 557                             lnet_peer_aliveness_enabled(peer))
 558                                 aliveness = lnet_is_peer_ni_alive(peer) ?
 559                                         "up" : "down";
 560
 561                         lnet_net_unlock(cpt);
 562
 563                         s += scnprintf(s, tmpstr + tmpsiz - s,
 564                                        "%-24s %4d %5s %5lld %5d %5d %5d %5d %5d %d\n",
 565                                        libcfs_nidstr(&nid), nrefs, aliveness,
 566                                        lastalive, maxcr, rtrcr, minrtrcr, txcr,
 567                                        mintxcr, txqnob);
 568                         LASSERT(tmpstr + tmpsiz - s > 0);
 569
 570                 } else { /* peer is NULL */
 571                         lnet_net_unlock(cpt);
 572                 }
 573
 574                 if (hash == LNET_PEER_HASH_SIZE) {
 575                         cpt++;
 576                         hash = 0;
 577                         hoff = 1;
 578                         if (peer == NULL && cpt < LNET_CPT_NUMBER)
 579                                 goto again;
 580                 }
 581         }
 582
 583         len = s - tmpstr;     /* how many bytes was written */
 584
 585         if (len > *lenp) {    /* linux-supplied buffer is too small */
 586                 rc = -EINVAL;
 587         } else if (len > 0) { /* wrote something */
 588                 if (copy_to_user(buffer, tmpstr, len))
 589                         rc = -EFAULT;
 590                 else
 591                         *ppos = LNET_PROC_POS_MAKE(cpt, ver, hash, hoff);
 592         }
 593
 594         LIBCFS_FREE(tmpstr, tmpsiz);
 595
 596         if (rc == 0)
 597                 *lenp = len;
 598
 599         return rc;
 600 }
 601
 602 static int proc_lnet_buffers(struct ctl_table *table, int write,
 603                              void __user *buffer, size_t *lenp, loff_t *ppos)
 604 {
 605         size_t nob = *lenp;
 606         loff_t pos = *ppos;
 607         char            *s;
 608         char            *tmpstr;
 609         int             tmpsiz;
 610         int             idx;
 611         int             len;
 612         int             rc;
 613         int             i;
 614
 615         LASSERT(!write);
 616
 617         /* (4 %d) * 4 * LNET_CPT_NUMBER */
 618         tmpsiz = 64 * (LNET_NRBPOOLS + 1) * LNET_CPT_NUMBER;
 619         LIBCFS_ALLOC(tmpstr, tmpsiz);
 620         if (tmpstr == NULL)
 621                 return -ENOMEM;
 622
 623         s = tmpstr; /* points to current position in tmpstr[] */
 624
 625         s += scnprintf(s, tmpstr + tmpsiz - s,
 626                        "%5s %5s %7s %7s\n",
 627                        "pages", "count", "credits", "min");
 628         LASSERT(tmpstr + tmpsiz - s > 0);
 629
 630         if (the_lnet.ln_rtrpools == NULL)
 631                 goto out; /* I'm not a router */
 632
 633         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 634                 struct lnet_rtrbufpool *rbp;
 635
 636                 lnet_net_lock(LNET_LOCK_EX);
 637                 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 638                         s += scnprintf(s, tmpstr + tmpsiz - s,
 639                                        "%5d %5d %7d %7d\n",
 640                                        rbp[idx].rbp_npages,
 641                                        rbp[idx].rbp_nbuffers,
 642                                        rbp[idx].rbp_credits,
 643                                        rbp[idx].rbp_mincredits);
 644                         LASSERT(tmpstr + tmpsiz - s > 0);
 645                 }
 646                 lnet_net_unlock(LNET_LOCK_EX);
 647         }
 648
 649  out:
 650         len = s - tmpstr;
 651
 652         if (pos >= min_t(int, len, strlen(tmpstr)))
 653                 rc = 0;
 654         else
 655                 rc = cfs_trace_copyout_string(buffer, nob,
 656                                               tmpstr + pos, NULL);
 657
 658         LIBCFS_FREE(tmpstr, tmpsiz);
 659         return rc;
 660 }
 661
 662 static int
 663 proc_lnet_nis(struct ctl_table *table, int write, void __user *buffer,
 664               size_t *lenp, loff_t *ppos)
 665 {
 666         int     tmpsiz = 128 * LNET_CPT_NUMBER;
 667         int     rc = 0;
 668         char    *tmpstr;
 669         char    *s;
 670         int     len;
 671
 672         if (*lenp == 0)
 673                 return 0;
 674
 675         if (write) {
 676                 /* Just reset the min stat. */
 677                 struct lnet_ni  *ni;
 678                 struct lnet_net *net;
 679
 680                 lnet_net_lock(0);
 681
 682                 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 683                         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 684                                 struct lnet_tx_queue *tq;
 685                                 int i;
 686                                 int j;
 687
 688                                 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 689                                         for (j = 0; ni->ni_cpts != NULL &&
 690                                              j < ni->ni_ncpts; j++) {
 691                                                 if (i == ni->ni_cpts[j])
 692                                                         break;
 693                                         }
 694
 695                                         if (j == ni->ni_ncpts)
 696                                                 continue;
 697
 698                                         if (i != 0)
 699                                                 lnet_net_lock(i);
 700                                         tq->tq_credits_min = tq->tq_credits;
 701                                         if (i != 0)
 702                                                 lnet_net_unlock(i);
 703                                 }
 704                         }
 705                 }
 706                 lnet_net_unlock(0);
 707                 *ppos += *lenp;
 708                 return 0;
 709         }
 710
 711         LIBCFS_ALLOC(tmpstr, tmpsiz);
 712         if (tmpstr == NULL)
 713                 return -ENOMEM;
 714
 715         s = tmpstr; /* points to current position in tmpstr[] */
 716
 717         if (*ppos == 0) {
 718                 s += scnprintf(s, tmpstr + tmpsiz - s,
 719                                "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 720                                "nid", "status", "alive", "refs", "peer",
 721                                "rtr", "max", "tx", "min");
 722                 LASSERT (tmpstr + tmpsiz - s > 0);
 723         } else {
 724                 struct lnet_ni *ni   = NULL;
 725                 int skip = *ppos - 1;
 726
 727                 lnet_net_lock(0);
 728
 729                 ni = lnet_get_ni_idx_locked(skip);
 730
 731                 if (ni != NULL) {
 732                         struct lnet_tx_queue *tq;
 733                         char *stat;
 734                         time64_t now = ktime_get_seconds();
 735                         time64_t last_alive = -1;
 736                         int i;
 737                         int j;
 738
 739                         if (the_lnet.ln_routing)
 740                                 last_alive = now - ni->ni_net->net_last_alive;
 741
 742                         lnet_ni_lock(ni);
 743                         LASSERT(ni->ni_status != NULL);
 744                         stat = (lnet_ni_get_status_locked(ni) ==
 745                                 LNET_NI_STATUS_UP) ? "up" : "down";
 746                         lnet_ni_unlock(ni);
 747
 748                         /* @lo forever alive */
 749                         if (ni->ni_net->net_lnd->lnd_type == LOLND) {
 750                                 last_alive = 0;
 751                                 stat = "up";
 752                         }
 753
 754                         /* we actually output credits information for
 755                          * TX queue of each partition */
 756                         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 757                                 for (j = 0; ni->ni_cpts != NULL &&
 758                                      j < ni->ni_ncpts; j++) {
 759                                         if (i == ni->ni_cpts[j])
 760                                                 break;
 761                                 }
 762
 763                                 if (j == ni->ni_ncpts)
 764                                         continue;
 765
 766                                 if (i != 0)
 767                                         lnet_net_lock(i);
 768
 769                                 s += scnprintf(s, tmpstr + tmpsiz - s,
 770                                        "%-24s %6s %5lld %4d %4d %4d %5d %5d %5d\n",
 771                                        libcfs_nidstr(&ni->ni_nid), stat,
 772                                        last_alive, *ni->ni_refs[i],
 773                                        ni->ni_net->net_tunables.lct_peer_tx_credits,
 774                                        ni->ni_net->net_tunables.lct_peer_rtr_credits,
 775                                        tq->tq_credits_max,
 776                                        tq->tq_credits, tq->tq_credits_min);
 777                                 if (i != 0)
 778                                         lnet_net_unlock(i);
 779                         }
 780                         LASSERT(tmpstr + tmpsiz - s > 0);
 781                 }
 782
 783                 lnet_net_unlock(0);
 784         }
 785
 786         len = s - tmpstr;     /* how many bytes was written */
 787
 788         if (len > *lenp) {    /* linux-supplied buffer is too small */
 789                 rc = -EINVAL;
 790         } else if (len > 0) { /* wrote something */
 791                 if (copy_to_user(buffer, tmpstr, len))
 792                         rc = -EFAULT;
 793                 else
 794                         *ppos += 1;
 795         }
 796
 797         LIBCFS_FREE(tmpstr, tmpsiz);
 798
 799         if (rc == 0)
 800                 *lenp = len;
 801
 802         return rc;
 803 }
 804
 805 struct lnet_portal_rotors {
 806         int             pr_value;
 807         const char      *pr_name;
 808         const char      *pr_desc;
 809 };
 810
 811 static struct lnet_portal_rotors        portal_rotors[] = {
 812         {
 813                 .pr_value = LNET_PTL_ROTOR_OFF,
 814                 .pr_name  = "OFF",
 815                 .pr_desc  = "Turn off message rotor for wildcard portals"
 816         },
 817         {
 818                 .pr_value = LNET_PTL_ROTOR_ON,
 819                 .pr_name  = "ON",
 820                 .pr_desc  = "round-robin dispatch all PUT messages for "
 821                             "wildcard portals"
 822         },
 823         {
 824                 .pr_value = LNET_PTL_ROTOR_RR_RT,
 825                 .pr_name  = "RR_RT",
 826                 .pr_desc  = "round-robin dispatch routed PUT message for "
 827                             "wildcard portals"
 828         },
 829         {
 830                 .pr_value = LNET_PTL_ROTOR_HASH_RT,
 831                 .pr_name  = "HASH_RT",
 832                 .pr_desc  = "dispatch routed PUT message by hashing source "
 833                             "NID for wildcard portals"
 834         },
 835         {
 836                 .pr_value = -1,
 837                 .pr_name  = NULL,
 838                 .pr_desc  = NULL
 839         },
 840 };
 841
 842 static int proc_lnet_portal_rotor(struct ctl_table *table, int write,
 843                                   void __user *buffer, size_t *lenp,
 844                                   loff_t *ppos)
 845 {
 846         const int       buf_len = 128;
 847         size_t nob = *lenp;
 848         loff_t pos = *ppos;
 849         char            *buf;
 850         char            *tmp;
 851         int             rc;
 852         int             i;
 853
 854         if (!write) {
 855                 LIBCFS_ALLOC(buf, buf_len);
 856                 if (buf == NULL)
 857                         return -ENOMEM;
 858
 859                 lnet_res_lock(0);
 860
 861                 for (i = 0; portal_rotors[i].pr_value >= 0; i++) {
 862                         if (portal_rotors[i].pr_value == portal_rotor)
 863                                 break;
 864                 }
 865
 866                 LASSERT(portal_rotors[i].pr_value == portal_rotor);
 867                 lnet_res_unlock(0);
 868
 869                 rc = scnprintf(buf, buf_len,
 870                                "{\n\tportals: all\n"
 871                                "\trotor: %s\n\tdescription: %s\n}",
 872                                portal_rotors[i].pr_name,
 873                                portal_rotors[i].pr_desc);
 874
 875                 if (pos >= min_t(int, rc, buf_len)) {
 876                         rc = 0;
 877                 } else {
 878                         rc = cfs_trace_copyout_string(buffer, nob,
 879                                                       buf + pos, "\n");
 880                 }
 881                 LIBCFS_FREE(buf, buf_len);
 882
 883                 return rc;
 884         }
 885
 886         buf = memdup_user_nul(buffer, nob);
 887         if (IS_ERR(buf))
 888                 return PTR_ERR(buf);
 889
 890         tmp = strim(buf);
 891
 892         rc = -EINVAL;
 893         lnet_res_lock(0);
 894         for (i = 0; portal_rotors[i].pr_name != NULL; i++) {
 895                 if (strncasecmp(portal_rotors[i].pr_name, tmp,
 896                                 strlen(portal_rotors[i].pr_name)) == 0) {
 897                         portal_rotor = portal_rotors[i].pr_value;
 898                         rc = 0;
 899                         break;
 900                 }
 901         }
 902         lnet_res_unlock(0);
 903         kfree(buf);
 904
 905         return rc;
 906 }
 907
 908 static struct ctl_table lnet_table[] = {
 909         /*
 910          * NB No .strategy entries have been provided since sysctl(8) prefers
 911          * to go via /proc for portability.
 912          */
 913         {
 914                 .procname       = "cpu_partition_table",
 915                 .maxlen         = 128,
 916                 .mode           = 0444,
 917                 .proc_handler   = &proc_cpt_table,
 918         },
 919         {
 920                 .procname       = "cpu_partition_distance",
 921                 .maxlen         = 128,
 922                 .mode           = 0444,
 923                 .proc_handler   = &proc_cpt_distance,
 924         },
 925         {
 926                 .procname       = "stats",
 927                 .mode           = 0644,
 928                 .proc_handler   = &proc_lnet_stats,
 929         },
 930         {
 931                 .procname       = "routes",
 932                 .mode           = 0444,
 933                 .proc_handler   = &proc_lnet_routes,
 934         },
 935         {
 936                 .procname       = "routers",
 937                 .mode           = 0444,
 938                 .proc_handler   = &proc_lnet_routers,
 939         },
 940         {
 941                 .procname       = "peers",
 942                 .mode           = 0644,
 943                 .proc_handler   = &proc_lnet_peers,
 944         },
 945         {
 946                 .procname       = "buffers",
 947                 .mode           = 0444,
 948                 .proc_handler   = &proc_lnet_buffers,
 949         },
 950         {
 951                 .procname       = "nis",
 952                 .mode           = 0644,
 953                 .proc_handler   = &proc_lnet_nis,
 954         },
 955         {
 956                 .procname       = "portal_rotor",
 957                 .mode           = 0644,
 958                 .proc_handler   = &proc_lnet_portal_rotor,
 959         },
 960         {
 961                 .procname       = "lnet_lnd_timeout",
 962                 .data           = &lnet_lnd_timeout,
 963                 .maxlen         = sizeof(lnet_lnd_timeout),
 964                 .mode           = 0444,
 965                 .proc_handler   = &debugfs_doint,
 966         },
 967         { .procname = NULL }
 968 };
 969
 970 static void *debugfs_state;
 971
 972 void lnet_router_debugfs_init(void)
 973 {
 974         lnet_insert_debugfs(lnet_table, THIS_MODULE,
 975                             &debugfs_state);
 976 }
 977
 978 void lnet_router_debugfs_fini(void)
 979 {
 980         lnet_remove_debugfs(lnet_table);
 981 }
 982 void lnet_router_exit(void)
 983 {
 984         lnet_debugfs_fini(&debugfs_state);
 985 }