lnet/lnet/router_proc.c

   1 /*
   2  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Copyright (c) 2011, 2017, Intel Corporation.
   5  *
   6  *   This file is part of Lustre, https://wiki.whamcloud.com/
   7  *
   8  *   Portals is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Portals is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Portals; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #define DEBUG_SUBSYSTEM S_LNET
  24
  25 #include <linux/uaccess.h>
  26
  27 #include <libcfs/libcfs.h>
  28 #include <lnet/lib-lnet.h>
  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 #define LNET_LOFFT_BITS         (sizeof(loff_t) * 8)
  34 /*
  35  * NB: max allowed LNET_CPT_BITS is 8 on 64-bit system and 2 on 32-bit system
  36  */
  37 #define LNET_PROC_CPT_BITS      (LNET_CPT_BITS + 1)
  38 /* change version, 16 bits or 8 bits */
  39 #define LNET_PROC_VER_BITS              \
  40         clamp_t(int, LNET_LOFFT_BITS / 4, 8, 16)
  41
  42 #define LNET_PROC_HASH_BITS     LNET_PEER_HASH_BITS
  43 /*
  44  * bits for peer hash offset
  45  * NB: we don't use the highest bit of *ppos because it's signed
  46  */
  47 #define LNET_PROC_HOFF_BITS     (LNET_LOFFT_BITS -       \
  48                                  LNET_PROC_CPT_BITS -    \
  49                                  LNET_PROC_VER_BITS -    \
  50                                  LNET_PROC_HASH_BITS - 1)
  51 /* bits for hash index + position */
  52 #define LNET_PROC_HPOS_BITS     (LNET_PROC_HASH_BITS + LNET_PROC_HOFF_BITS)
  53 /* bits for peer hash table + hash version */
  54 #define LNET_PROC_VPOS_BITS     (LNET_PROC_HPOS_BITS + LNET_PROC_VER_BITS)
  55
  56 #define LNET_PROC_CPT_MASK      ((1ULL << LNET_PROC_CPT_BITS) - 1)
  57 #define LNET_PROC_VER_MASK      ((1ULL << LNET_PROC_VER_BITS) - 1)
  58 #define LNET_PROC_HASH_MASK     ((1ULL << LNET_PROC_HASH_BITS) - 1)
  59 #define LNET_PROC_HOFF_MASK     ((1ULL << LNET_PROC_HOFF_BITS) - 1)
  60
  61 #define LNET_PROC_CPT_GET(pos)                          \
  62         (int)(((pos) >> LNET_PROC_VPOS_BITS) & LNET_PROC_CPT_MASK)
  63
  64 #define LNET_PROC_VER_GET(pos)                          \
  65         (int)(((pos) >> LNET_PROC_HPOS_BITS) & LNET_PROC_VER_MASK)
  66
  67 #define LNET_PROC_HASH_GET(pos)                         \
  68         (int)(((pos) >> LNET_PROC_HOFF_BITS) & LNET_PROC_HASH_MASK)
  69
  70 #define LNET_PROC_HOFF_GET(pos)                         \
  71         (int)((pos) & LNET_PROC_HOFF_MASK)
  72
  73 #define LNET_PROC_POS_MAKE(cpt, ver, hash, off)         \
  74         (((((loff_t)(cpt)) & LNET_PROC_CPT_MASK) << LNET_PROC_VPOS_BITS) |   \
  75         ((((loff_t)(ver)) & LNET_PROC_VER_MASK) << LNET_PROC_HPOS_BITS) |   \
  76         ((((loff_t)(hash)) & LNET_PROC_HASH_MASK) << LNET_PROC_HOFF_BITS) | \
  77         ((off) & LNET_PROC_HOFF_MASK))
  78
  79 #define LNET_PROC_VERSION(v)    ((unsigned int)((v) & LNET_PROC_VER_MASK))
  80
  81 static int __proc_lnet_stats(void *data, int write,
  82                              loff_t pos, void __user *buffer, int nob)
  83 {
  84         int              rc;
  85         struct lnet_counters *ctrs;
  86         struct lnet_counters_common common;
  87         int              len;
  88         char tmpstr[256]; /* 7 %u and 4 u64 */
  89
  90         if (write) {
  91                 lnet_counters_reset();
  92                 return 0;
  93         }
  94
  95         /* read */
  96
  97         LIBCFS_ALLOC(ctrs, sizeof(*ctrs));
  98         if (ctrs == NULL)
  99                 return -ENOMEM;
 100
 101         rc = lnet_counters_get(ctrs);
 102         if (rc)
 103                 goto out_no_ctrs;
 104
 105         common = ctrs->lct_common;
 106
 107         len = scnprintf(tmpstr, sizeof(tmpstr),
 108                         "%u %u %u %u %u %u %u %llu %llu "
 109                         "%llu %llu",
 110                         common.lcc_msgs_alloc, common.lcc_msgs_max,
 111                         common.lcc_errors,
 112                         common.lcc_send_count, common.lcc_recv_count,
 113                         common.lcc_route_count, common.lcc_drop_count,
 114                         common.lcc_send_length, common.lcc_recv_length,
 115                         common.lcc_route_length, common.lcc_drop_length);
 116
 117         if (pos >= len)
 118                 rc = 0;
 119         else
 120                 rc = cfs_trace_copyout_string(buffer, nob,
 121                                               tmpstr + pos, "\n");
 122 out_no_ctrs:
 123         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 124         return rc;
 125 }
 126
 127 static int
 128 proc_lnet_stats(struct ctl_table *table, int write, void __user *buffer,
 129                 size_t *lenp, loff_t *ppos)
 130 {
 131         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 132                                     __proc_lnet_stats);
 133 }
 134
 135 static int
 136 proc_lnet_routes(struct ctl_table *table, int write, void __user *buffer,
 137                  size_t *lenp, loff_t *ppos)
 138 {
 139         const int       tmpsiz = 256;
 140         char            *tmpstr;
 141         char            *s;
 142         int             rc = 0;
 143         int             len;
 144         int             ver;
 145         int             off;
 146
 147         BUILD_BUG_ON(sizeof(loff_t) < 4);
 148
 149         off = LNET_PROC_HOFF_GET(*ppos);
 150         ver = LNET_PROC_VER_GET(*ppos);
 151
 152         LASSERT(!write);
 153
 154         if (*lenp == 0)
 155                 return 0;
 156
 157         LIBCFS_ALLOC(tmpstr, tmpsiz);
 158         if (tmpstr == NULL)
 159                 return -ENOMEM;
 160
 161         s = tmpstr; /* points to current position in tmpstr[] */
 162
 163         if (*ppos == 0) {
 164                 s += scnprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 165                                the_lnet.ln_routing ? "enabled" : "disabled");
 166                 LASSERT(tmpstr + tmpsiz - s > 0);
 167
 168                 s += scnprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %8s %7s %s\n",
 169                                "net", "hops", "priority", "state", "router");
 170                 LASSERT(tmpstr + tmpsiz - s > 0);
 171
 172                 lnet_net_lock(0);
 173                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 174                 lnet_net_unlock(0);
 175                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 176         } else {
 177                 struct list_head        *n;
 178                 struct list_head        *r;
 179                 struct lnet_route               *route = NULL;
 180                 struct lnet_remotenet   *rnet  = NULL;
 181                 int                     skip  = off - 1;
 182                 struct list_head        *rn_list;
 183                 int                     i;
 184
 185                 lnet_net_lock(0);
 186
 187                 if (ver != LNET_PROC_VERSION(the_lnet.ln_remote_nets_version)) {
 188                         lnet_net_unlock(0);
 189                         LIBCFS_FREE(tmpstr, tmpsiz);
 190                         return -ESTALE;
 191                 }
 192
 193                 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE && route == NULL;
 194                      i++) {
 195                         rn_list = &the_lnet.ln_remote_nets_hash[i];
 196
 197                         n = rn_list->next;
 198
 199                         while (n != rn_list && route == NULL) {
 200                                 rnet = list_entry(n, struct lnet_remotenet,
 201                                                   lrn_list);
 202
 203                                 r = rnet->lrn_routes.next;
 204
 205                                 while (r != &rnet->lrn_routes) {
 206                                         struct lnet_route *re =
 207                                                 list_entry(r, struct lnet_route,
 208                                                            lr_list);
 209                                         if (skip == 0) {
 210                                                 route = re;
 211                                                 break;
 212                                         }
 213
 214                                         skip--;
 215                                         r = r->next;
 216                                 }
 217
 218                                 n = n->next;
 219                         }
 220                 }
 221
 222                 if (route != NULL) {
 223                         __u32 net = rnet->lrn_net;
 224                         __u32 hops = route->lr_hops;
 225                         unsigned int priority = route->lr_priority;
 226                         int alive = lnet_is_route_alive(route);
 227
 228                         s += scnprintf(s, tmpstr + tmpsiz - s,
 229                                        "%-8s %4d %8u %7s %s\n",
 230                                        libcfs_net2str(net), hops,
 231                                        priority,
 232                                        alive ? "up" : "down",
 233                                        libcfs_nid2str(route->lr_nid));
 234                         LASSERT(tmpstr + tmpsiz - s > 0);
 235                 }
 236
 237                 lnet_net_unlock(0);
 238         }
 239
 240         len = s - tmpstr;     /* how many bytes was written */
 241
 242         if (len > *lenp) {    /* linux-supplied buffer is too small */
 243                 rc = -EINVAL;
 244         } else if (len > 0) { /* wrote something */
 245                 if (copy_to_user(buffer, tmpstr, len))
 246                         rc = -EFAULT;
 247                 else {
 248                         off += 1;
 249                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 250                 }
 251         }
 252
 253         LIBCFS_FREE(tmpstr, tmpsiz);
 254
 255         if (rc == 0)
 256                 *lenp = len;
 257
 258         return rc;
 259 }
 260
 261 static int
 262 proc_lnet_routers(struct ctl_table *table, int write, void __user *buffer,
 263                   size_t *lenp, loff_t *ppos)
 264 {
 265         int        rc = 0;
 266         char      *tmpstr;
 267         char      *s;
 268         const int  tmpsiz = 256;
 269         int        len;
 270         int        ver;
 271         int        off;
 272
 273         off = LNET_PROC_HOFF_GET(*ppos);
 274         ver = LNET_PROC_VER_GET(*ppos);
 275
 276         LASSERT(!write);
 277
 278         if (*lenp == 0)
 279                 return 0;
 280
 281         LIBCFS_ALLOC(tmpstr, tmpsiz);
 282         if (tmpstr == NULL)
 283                 return -ENOMEM;
 284
 285         s = tmpstr; /* points to current position in tmpstr[] */
 286
 287         if (*ppos == 0) {
 288                 s += scnprintf(s, tmpstr + tmpsiz - s,
 289                                "%-4s %7s %5s %s\n",
 290                                "ref", "rtr_ref", "alive", "router");
 291                 LASSERT(tmpstr + tmpsiz - s > 0);
 292
 293                 lnet_net_lock(0);
 294                 ver = (unsigned int)the_lnet.ln_routers_version;
 295                 lnet_net_unlock(0);
 296                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 297         } else {
 298                 struct list_head *r;
 299                 struct lnet_peer *peer = NULL;
 300                 int               skip = off - 1;
 301
 302                 lnet_net_lock(0);
 303
 304                 if (ver != LNET_PROC_VERSION(the_lnet.ln_routers_version)) {
 305                         lnet_net_unlock(0);
 306
 307                         LIBCFS_FREE(tmpstr, tmpsiz);
 308                         return -ESTALE;
 309                 }
 310
 311                 r = the_lnet.ln_routers.next;
 312
 313                 while (r != &the_lnet.ln_routers) {
 314                         struct lnet_peer *lp =
 315                           list_entry(r, struct lnet_peer,
 316                                      lp_rtr_list);
 317
 318                         if (skip == 0) {
 319                                 peer = lp;
 320                                 break;
 321                         }
 322
 323                         skip--;
 324                         r = r->next;
 325                 }
 326
 327                 if (peer != NULL) {
 328                         lnet_nid_t nid = peer->lp_primary_nid;
 329                         int nrefs     = atomic_read(&peer->lp_refcount);
 330                         int nrtrrefs  = peer->lp_rtr_refcount;
 331                         int alive     = lnet_is_gateway_alive(peer);
 332
 333                         s += scnprintf(s, tmpstr + tmpsiz - s,
 334                                        "%-4d %7d %5s %s\n",
 335                                        nrefs, nrtrrefs,
 336                                        alive ? "up" : "down",
 337                                        libcfs_nid2str(nid));
 338                 }
 339
 340                 lnet_net_unlock(0);
 341         }
 342
 343         len = s - tmpstr;     /* how many bytes was written */
 344
 345         if (len > *lenp) {    /* linux-supplied buffer is too small */
 346                 rc = -EINVAL;
 347         } else if (len > 0) { /* wrote something */
 348                 if (copy_to_user(buffer, tmpstr, len))
 349                         rc = -EFAULT;
 350                 else {
 351                         off += 1;
 352                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 353                 }
 354         }
 355
 356         LIBCFS_FREE(tmpstr, tmpsiz);
 357
 358         if (rc == 0)
 359                 *lenp = len;
 360
 361         return rc;
 362 }
 363
 364 /* TODO: there should be no direct access to ptable. We should add a set
 365  * of APIs that give access to the ptable and its members */
 366 static int
 367 proc_lnet_peers(struct ctl_table *table, int write, void __user *buffer,
 368                 size_t *lenp, loff_t *ppos)
 369 {
 370         const int               tmpsiz  = 256;
 371         struct lnet_peer_table  *ptable;
 372         char                    *tmpstr = NULL;
 373         char                    *s;
 374         int                     cpt  = LNET_PROC_CPT_GET(*ppos);
 375         int                     ver  = LNET_PROC_VER_GET(*ppos);
 376         int                     hash = LNET_PROC_HASH_GET(*ppos);
 377         int                     hoff = LNET_PROC_HOFF_GET(*ppos);
 378         int                     rc = 0;
 379         int                     len;
 380
 381         if (write) {
 382                 int i;
 383                 struct lnet_peer_ni *peer;
 384
 385                 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
 386                         lnet_net_lock(i);
 387                         for (hash = 0; hash < LNET_PEER_HASH_SIZE; hash++) {
 388                                 list_for_each_entry(peer,
 389                                                     &ptable->pt_hash[hash],
 390                                                     lpni_hashlist) {
 391                                         peer->lpni_mintxcredits =
 392                                                 peer->lpni_txcredits;
 393                                         peer->lpni_minrtrcredits =
 394                                                 peer->lpni_rtrcredits;
 395                                 }
 396                         }
 397                         lnet_net_unlock(i);
 398                 }
 399                 *ppos += *lenp;
 400                 return 0;
 401         }
 402
 403         if (*lenp == 0)
 404                 return 0;
 405
 406         BUILD_BUG_ON(LNET_PROC_HASH_BITS < LNET_PEER_HASH_BITS);
 407
 408         if (cpt >= LNET_CPT_NUMBER) {
 409                 *lenp = 0;
 410                 return 0;
 411         }
 412
 413         LIBCFS_ALLOC(tmpstr, tmpsiz);
 414         if (tmpstr == NULL)
 415                 return -ENOMEM;
 416
 417         s = tmpstr; /* points to current position in tmpstr[] */
 418
 419         if (*ppos == 0) {
 420                 s += scnprintf(s, tmpstr + tmpsiz - s,
 421                                "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 422                                "nid", "refs", "state", "last", "max",
 423                                "rtr", "min", "tx", "min", "queue");
 424                 LASSERT(tmpstr + tmpsiz - s > 0);
 425
 426                 hoff++;
 427         } else {
 428                 struct lnet_peer_ni     *peer;
 429                 struct list_head        *p;
 430                 int                     skip;
 431
 432  again:
 433                 p = NULL;
 434                 peer = NULL;
 435                 skip = hoff - 1;
 436
 437                 lnet_net_lock(cpt);
 438                 ptable = the_lnet.ln_peer_tables[cpt];
 439                 if (hoff == 1)
 440                         ver = LNET_PROC_VERSION(ptable->pt_version);
 441
 442                 if (ver != LNET_PROC_VERSION(ptable->pt_version)) {
 443                         lnet_net_unlock(cpt);
 444                         LIBCFS_FREE(tmpstr, tmpsiz);
 445                         return -ESTALE;
 446                 }
 447
 448                 while (hash < LNET_PEER_HASH_SIZE) {
 449                         if (p == NULL)
 450                                 p = ptable->pt_hash[hash].next;
 451
 452                         while (p != &ptable->pt_hash[hash]) {
 453                                 struct lnet_peer_ni *lp =
 454                                   list_entry(p, struct lnet_peer_ni,
 455                                              lpni_hashlist);
 456                                 if (skip == 0) {
 457                                         peer = lp;
 458
 459                                         /* minor optimization: start from idx+1
 460                                          * on next iteration if we've just
 461                                          * drained lpni_hashlist */
 462                                         if (lp->lpni_hashlist.next ==
 463                                             &ptable->pt_hash[hash]) {
 464                                                 hoff = 1;
 465                                                 hash++;
 466                                         } else {
 467                                                 hoff++;
 468                                         }
 469
 470                                         break;
 471                                 }
 472
 473                                 skip--;
 474                                 p = lp->lpni_hashlist.next;
 475                         }
 476
 477                         if (peer != NULL)
 478                                 break;
 479
 480                         p = NULL;
 481                         hoff = 1;
 482                         hash++;
 483                 }
 484
 485                 if (peer != NULL) {
 486                         lnet_nid_t nid = peer->lpni_nid;
 487                         int nrefs = atomic_read(&peer->lpni_refcount);
 488                         time64_t lastalive = -1;
 489                         char *aliveness = "NA";
 490                         int maxcr = (peer->lpni_net) ?
 491                           peer->lpni_net->net_tunables.lct_peer_tx_credits : 0;
 492                         int txcr = peer->lpni_txcredits;
 493                         int mintxcr = peer->lpni_mintxcredits;
 494                         int rtrcr = peer->lpni_rtrcredits;
 495                         int minrtrcr = peer->lpni_minrtrcredits;
 496                         int txqnob = peer->lpni_txqnob;
 497
 498                         if (lnet_isrouter(peer) ||
 499                             lnet_peer_aliveness_enabled(peer))
 500                                 aliveness = lnet_is_peer_ni_alive(peer) ?
 501                                         "up" : "down";
 502
 503                         lnet_net_unlock(cpt);
 504
 505                         s += scnprintf(s, tmpstr + tmpsiz - s,
 506                                        "%-24s %4d %5s %5lld %5d %5d %5d %5d %5d %d\n",
 507                                        libcfs_nid2str(nid), nrefs, aliveness,
 508                                        lastalive, maxcr, rtrcr, minrtrcr, txcr,
 509                                        mintxcr, txqnob);
 510                         LASSERT(tmpstr + tmpsiz - s > 0);
 511
 512                 } else { /* peer is NULL */
 513                         lnet_net_unlock(cpt);
 514                 }
 515
 516                 if (hash == LNET_PEER_HASH_SIZE) {
 517                         cpt++;
 518                         hash = 0;
 519                         hoff = 1;
 520                         if (peer == NULL && cpt < LNET_CPT_NUMBER)
 521                                 goto again;
 522                 }
 523         }
 524
 525         len = s - tmpstr;     /* how many bytes was written */
 526
 527         if (len > *lenp) {    /* linux-supplied buffer is too small */
 528                 rc = -EINVAL;
 529         } else if (len > 0) { /* wrote something */
 530                 if (copy_to_user(buffer, tmpstr, len))
 531                         rc = -EFAULT;
 532                 else
 533                         *ppos = LNET_PROC_POS_MAKE(cpt, ver, hash, hoff);
 534         }
 535
 536         LIBCFS_FREE(tmpstr, tmpsiz);
 537
 538         if (rc == 0)
 539                 *lenp = len;
 540
 541         return rc;
 542 }
 543
 544 static int __proc_lnet_buffers(void *data, int write,
 545                                loff_t pos, void __user *buffer, int nob)
 546 {
 547         char            *s;
 548         char            *tmpstr;
 549         int             tmpsiz;
 550         int             idx;
 551         int             len;
 552         int             rc;
 553         int             i;
 554
 555         LASSERT(!write);
 556
 557         /* (4 %d) * 4 * LNET_CPT_NUMBER */
 558         tmpsiz = 64 * (LNET_NRBPOOLS + 1) * LNET_CPT_NUMBER;
 559         LIBCFS_ALLOC(tmpstr, tmpsiz);
 560         if (tmpstr == NULL)
 561                 return -ENOMEM;
 562
 563         s = tmpstr; /* points to current position in tmpstr[] */
 564
 565         s += scnprintf(s, tmpstr + tmpsiz - s,
 566                        "%5s %5s %7s %7s\n",
 567                        "pages", "count", "credits", "min");
 568         LASSERT(tmpstr + tmpsiz - s > 0);
 569
 570         if (the_lnet.ln_rtrpools == NULL)
 571                 goto out; /* I'm not a router */
 572
 573         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 574                 struct lnet_rtrbufpool *rbp;
 575
 576                 lnet_net_lock(LNET_LOCK_EX);
 577                 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 578                         s += scnprintf(s, tmpstr + tmpsiz - s,
 579                                        "%5d %5d %7d %7d\n",
 580                                        rbp[idx].rbp_npages,
 581                                        rbp[idx].rbp_nbuffers,
 582                                        rbp[idx].rbp_credits,
 583                                        rbp[idx].rbp_mincredits);
 584                         LASSERT(tmpstr + tmpsiz - s > 0);
 585                 }
 586                 lnet_net_unlock(LNET_LOCK_EX);
 587         }
 588
 589  out:
 590         len = s - tmpstr;
 591
 592         if (pos >= min_t(int, len, strlen(tmpstr)))
 593                 rc = 0;
 594         else
 595                 rc = cfs_trace_copyout_string(buffer, nob,
 596                                               tmpstr + pos, NULL);
 597
 598         LIBCFS_FREE(tmpstr, tmpsiz);
 599         return rc;
 600 }
 601
 602 static int
 603 proc_lnet_buffers(struct ctl_table *table, int write, void __user *buffer,
 604                   size_t *lenp, loff_t *ppos)
 605 {
 606         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 607                                     __proc_lnet_buffers);
 608 }
 609
 610 static int
 611 proc_lnet_nis(struct ctl_table *table, int write, void __user *buffer,
 612               size_t *lenp, loff_t *ppos)
 613 {
 614         int     tmpsiz = 128 * LNET_CPT_NUMBER;
 615         int     rc = 0;
 616         char    *tmpstr;
 617         char    *s;
 618         int     len;
 619
 620         if (*lenp == 0)
 621                 return 0;
 622
 623         if (write) {
 624                 /* Just reset the min stat. */
 625                 struct lnet_ni  *ni;
 626                 struct lnet_net *net;
 627
 628                 lnet_net_lock(0);
 629
 630                 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 631                         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 632                                 struct lnet_tx_queue *tq;
 633                                 int i;
 634                                 int j;
 635
 636                                 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 637                                         for (j = 0; ni->ni_cpts != NULL &&
 638                                              j < ni->ni_ncpts; j++) {
 639                                                 if (i == ni->ni_cpts[j])
 640                                                         break;
 641                                         }
 642
 643                                         if (j == ni->ni_ncpts)
 644                                                 continue;
 645
 646                                         if (i != 0)
 647                                                 lnet_net_lock(i);
 648                                         tq->tq_credits_min = tq->tq_credits;
 649                                         if (i != 0)
 650                                                 lnet_net_unlock(i);
 651                                 }
 652                         }
 653                 }
 654                 lnet_net_unlock(0);
 655                 *ppos += *lenp;
 656                 return 0;
 657         }
 658
 659         LIBCFS_ALLOC(tmpstr, tmpsiz);
 660         if (tmpstr == NULL)
 661                 return -ENOMEM;
 662
 663         s = tmpstr; /* points to current position in tmpstr[] */
 664
 665         if (*ppos == 0) {
 666                 s += scnprintf(s, tmpstr + tmpsiz - s,
 667                                "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 668                                "nid", "status", "alive", "refs", "peer",
 669                                "rtr", "max", "tx", "min");
 670                 LASSERT (tmpstr + tmpsiz - s > 0);
 671         } else {
 672                 struct lnet_ni *ni   = NULL;
 673                 int skip = *ppos - 1;
 674
 675                 lnet_net_lock(0);
 676
 677                 ni = lnet_get_ni_idx_locked(skip);
 678
 679                 if (ni != NULL) {
 680                         struct lnet_tx_queue *tq;
 681                         char *stat;
 682                         time64_t now = ktime_get_real_seconds();
 683                         time64_t last_alive = -1;
 684                         int i;
 685                         int j;
 686
 687                         if (the_lnet.ln_routing)
 688                                 last_alive = now - ni->ni_net->net_last_alive;
 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                         /* @lo forever alive */
 697                         if (ni->ni_net->net_lnd->lnd_type == LOLND) {
 698                                 last_alive = 0;
 699                                 stat = "up";
 700                         }
 701
 702                         /* we actually output credits information for
 703                          * TX queue of each partition */
 704                         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 705                                 for (j = 0; ni->ni_cpts != NULL &&
 706                                      j < ni->ni_ncpts; j++) {
 707                                         if (i == ni->ni_cpts[j])
 708                                                 break;
 709                                 }
 710
 711                                 if (j == ni->ni_ncpts)
 712                                         continue;
 713
 714                                 if (i != 0)
 715                                         lnet_net_lock(i);
 716
 717                                 s += scnprintf(s, tmpstr + tmpsiz - s,
 718                                        "%-24s %6s %5lld %4d %4d %4d %5d %5d %5d\n",
 719                                        libcfs_nid2str(ni->ni_nid), stat,
 720                                        last_alive, *ni->ni_refs[i],
 721                                        ni->ni_net->net_tunables.lct_peer_tx_credits,
 722                                        ni->ni_net->net_tunables.lct_peer_rtr_credits,
 723                                        tq->tq_credits_max,
 724                                        tq->tq_credits, tq->tq_credits_min);
 725                                 if (i != 0)
 726                                         lnet_net_unlock(i);
 727                         }
 728                         LASSERT(tmpstr + tmpsiz - s > 0);
 729                 }
 730
 731                 lnet_net_unlock(0);
 732         }
 733
 734         len = s - tmpstr;     /* how many bytes was written */
 735
 736         if (len > *lenp) {    /* linux-supplied buffer is too small */
 737                 rc = -EINVAL;
 738         } else if (len > 0) { /* wrote something */
 739                 if (copy_to_user(buffer, tmpstr, len))
 740                         rc = -EFAULT;
 741                 else
 742                         *ppos += 1;
 743         }
 744
 745         LIBCFS_FREE(tmpstr, tmpsiz);
 746
 747         if (rc == 0)
 748                 *lenp = len;
 749
 750         return rc;
 751 }
 752
 753 struct lnet_portal_rotors {
 754         int             pr_value;
 755         const char      *pr_name;
 756         const char      *pr_desc;
 757 };
 758
 759 static struct lnet_portal_rotors        portal_rotors[] = {
 760         {
 761                 .pr_value = LNET_PTL_ROTOR_OFF,
 762                 .pr_name  = "OFF",
 763                 .pr_desc  = "Turn off message rotor for wildcard portals"
 764         },
 765         {
 766                 .pr_value = LNET_PTL_ROTOR_ON,
 767                 .pr_name  = "ON",
 768                 .pr_desc  = "round-robin dispatch all PUT messages for "
 769                             "wildcard portals"
 770         },
 771         {
 772                 .pr_value = LNET_PTL_ROTOR_RR_RT,
 773                 .pr_name  = "RR_RT",
 774                 .pr_desc  = "round-robin dispatch routed PUT message for "
 775                             "wildcard portals"
 776         },
 777         {
 778                 .pr_value = LNET_PTL_ROTOR_HASH_RT,
 779                 .pr_name  = "HASH_RT",
 780                 .pr_desc  = "dispatch routed PUT message by hashing source "
 781                             "NID for wildcard portals"
 782         },
 783         {
 784                 .pr_value = -1,
 785                 .pr_name  = NULL,
 786                 .pr_desc  = NULL
 787         },
 788 };
 789
 790 static int __proc_lnet_portal_rotor(void *data, int write,
 791                                     loff_t pos, void __user *buffer, int nob)
 792 {
 793         const int       buf_len = 128;
 794         char            *buf;
 795         char            *tmp;
 796         int             rc;
 797         int             i;
 798
 799         LIBCFS_ALLOC(buf, buf_len);
 800         if (buf == NULL)
 801                 return -ENOMEM;
 802
 803         if (!write) {
 804                 lnet_res_lock(0);
 805
 806                 for (i = 0; portal_rotors[i].pr_value >= 0; i++) {
 807                         if (portal_rotors[i].pr_value == portal_rotor)
 808                                 break;
 809                 }
 810
 811                 LASSERT(portal_rotors[i].pr_value == portal_rotor);
 812                 lnet_res_unlock(0);
 813
 814                 rc = scnprintf(buf, buf_len,
 815                                "{\n\tportals: all\n"
 816                                "\trotor: %s\n\tdescription: %s\n}",
 817                                portal_rotors[i].pr_name,
 818                                portal_rotors[i].pr_desc);
 819
 820                 if (pos >= min_t(int, rc, buf_len)) {
 821                         rc = 0;
 822                 } else {
 823                         rc = cfs_trace_copyout_string(buffer, nob,
 824                                         buf + pos, "\n");
 825                 }
 826                 goto out;
 827         }
 828
 829         rc = cfs_trace_copyin_string(buf, buf_len, buffer, nob);
 830         if (rc < 0)
 831                 goto out;
 832
 833         tmp = strim(buf);
 834
 835         rc = -EINVAL;
 836         lnet_res_lock(0);
 837         for (i = 0; portal_rotors[i].pr_name != NULL; i++) {
 838                 if (strncasecmp(portal_rotors[i].pr_name, tmp,
 839                                 strlen(portal_rotors[i].pr_name)) == 0) {
 840                         portal_rotor = portal_rotors[i].pr_value;
 841                         rc = 0;
 842                         break;
 843                 }
 844         }
 845         lnet_res_unlock(0);
 846 out:
 847         LIBCFS_FREE(buf, buf_len);
 848         return rc;
 849 }
 850
 851 static int
 852 proc_lnet_portal_rotor(struct ctl_table *table, int write, void __user *buffer,
 853                        size_t *lenp, loff_t *ppos)
 854 {
 855         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 856                                     __proc_lnet_portal_rotor);
 857 }
 858
 859
 860 static struct ctl_table lnet_table[] = {
 861         /*
 862          * NB No .strategy entries have been provided since sysctl(8) prefers
 863          * to go via /proc for portability.
 864          */
 865         {
 866                 .procname       = "stats",
 867                 .mode           = 0644,
 868                 .proc_handler   = &proc_lnet_stats,
 869         },
 870         {
 871                 .procname       = "routes",
 872                 .mode           = 0444,
 873                 .proc_handler   = &proc_lnet_routes,
 874         },
 875         {
 876                 .procname       = "routers",
 877                 .mode           = 0444,
 878                 .proc_handler   = &proc_lnet_routers,
 879         },
 880         {
 881                 .procname       = "peers",
 882                 .mode           = 0644,
 883                 .proc_handler   = &proc_lnet_peers,
 884         },
 885         {
 886                 .procname       = "buffers",
 887                 .mode           = 0444,
 888                 .proc_handler   = &proc_lnet_buffers,
 889         },
 890         {
 891                 .procname       = "nis",
 892                 .mode           = 0644,
 893                 .proc_handler   = &proc_lnet_nis,
 894         },
 895         {
 896                 .procname       = "portal_rotor",
 897                 .mode           = 0644,
 898                 .proc_handler   = &proc_lnet_portal_rotor,
 899         },
 900         {
 901                 .procname       = "lnet_lnd_timeout",
 902                 .data           = &lnet_lnd_timeout,
 903                 .maxlen         = sizeof(lnet_lnd_timeout),
 904                 .mode           = 0444,
 905                 .proc_handler   = &proc_dointvec,
 906         },
 907         { .procname = NULL }
 908 };
 909
 910 void lnet_router_debugfs_init(void)
 911 {
 912         lnet_insert_debugfs(lnet_table);
 913 }
 914
 915 void lnet_router_debugfs_fini(void)
 916 {
 917         lnet_remove_debugfs(lnet_table);
 918 }