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      MAX(((MIN(LNET_LOFFT_BITS, 64)) / 4), 8)
  40
  41 #define LNET_PROC_HASH_BITS     LNET_PEER_HASH_BITS
  42 /*
  43  * bits for peer hash offset
  44  * NB: we don't use the highest bit of *ppos because it's signed
  45  */
  46 #define LNET_PROC_HOFF_BITS     (LNET_LOFFT_BITS -       \
  47                                  LNET_PROC_CPT_BITS -    \
  48                                  LNET_PROC_VER_BITS -    \
  49                                  LNET_PROC_HASH_BITS - 1)
  50 /* bits for hash index + position */
  51 #define LNET_PROC_HPOS_BITS     (LNET_PROC_HASH_BITS + LNET_PROC_HOFF_BITS)
  52 /* bits for peer hash table + hash version */
  53 #define LNET_PROC_VPOS_BITS     (LNET_PROC_HPOS_BITS + LNET_PROC_VER_BITS)
  54
  55 #define LNET_PROC_CPT_MASK      ((1ULL << LNET_PROC_CPT_BITS) - 1)
  56 #define LNET_PROC_VER_MASK      ((1ULL << LNET_PROC_VER_BITS) - 1)
  57 #define LNET_PROC_HASH_MASK     ((1ULL << LNET_PROC_HASH_BITS) - 1)
  58 #define LNET_PROC_HOFF_MASK     ((1ULL << LNET_PROC_HOFF_BITS) - 1)
  59
  60 #define LNET_PROC_CPT_GET(pos)                          \
  61         (int)(((pos) >> LNET_PROC_VPOS_BITS) & LNET_PROC_CPT_MASK)
  62
  63 #define LNET_PROC_VER_GET(pos)                          \
  64         (int)(((pos) >> LNET_PROC_HPOS_BITS) & LNET_PROC_VER_MASK)
  65
  66 #define LNET_PROC_HASH_GET(pos)                         \
  67         (int)(((pos) >> LNET_PROC_HOFF_BITS) & LNET_PROC_HASH_MASK)
  68
  69 #define LNET_PROC_HOFF_GET(pos)                         \
  70         (int)((pos) & LNET_PROC_HOFF_MASK)
  71
  72 #define LNET_PROC_POS_MAKE(cpt, ver, hash, off)         \
  73         (((((loff_t)(cpt)) & LNET_PROC_CPT_MASK) << LNET_PROC_VPOS_BITS) |   \
  74         ((((loff_t)(ver)) & LNET_PROC_VER_MASK) << LNET_PROC_HPOS_BITS) |   \
  75         ((((loff_t)(hash)) & LNET_PROC_HASH_MASK) << LNET_PROC_HOFF_BITS) | \
  76         ((off) & LNET_PROC_HOFF_MASK))
  77
  78 #define LNET_PROC_VERSION(v)    ((unsigned int)((v) & LNET_PROC_VER_MASK))
  79
  80 static int __proc_lnet_stats(void *data, int write,
  81                              loff_t pos, void __user *buffer, int nob)
  82 {
  83         int              rc;
  84         struct lnet_counters *ctrs;
  85         struct lnet_counters_common common;
  86         int              len;
  87         char            *tmpstr;
  88         const int        tmpsiz = 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         LIBCFS_ALLOC(tmpstr, tmpsiz);
 102         if (tmpstr == NULL) {
 103                 LIBCFS_FREE(ctrs, sizeof(*ctrs));
 104                 return -ENOMEM;
 105         }
 106
 107         lnet_counters_get(ctrs);
 108         common = ctrs->lct_common;
 109
 110         len = snprintf(tmpstr, tmpsiz,
 111                        "%u %u %u %u %u %u %u %llu %llu "
 112                        "%llu %llu",
 113                        common.lcc_msgs_alloc, common.lcc_msgs_max,
 114                        common.lcc_errors,
 115                        common.lcc_send_count, common.lcc_recv_count,
 116                        common.lcc_route_count, common.lcc_drop_count,
 117                        common.lcc_send_length, common.lcc_recv_length,
 118                        common.lcc_route_length, common.lcc_drop_length);
 119
 120         if (pos >= min_t(int, len, strlen(tmpstr)))
 121                 rc = 0;
 122         else
 123                 rc = cfs_trace_copyout_string(buffer, nob,
 124                                               tmpstr + pos, "\n");
 125
 126         LIBCFS_FREE(tmpstr, tmpsiz);
 127         LIBCFS_FREE(ctrs, sizeof(*ctrs));
 128         return rc;
 129 }
 130
 131 static int
 132 proc_lnet_stats(struct ctl_table *table, int write, void __user *buffer,
 133                 size_t *lenp, loff_t *ppos)
 134 {
 135         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 136                                     __proc_lnet_stats);
 137 }
 138
 139 static int
 140 proc_lnet_routes(struct ctl_table *table, int write, void __user *buffer,
 141                  size_t *lenp, loff_t *ppos)
 142 {
 143         const int       tmpsiz = 256;
 144         char            *tmpstr;
 145         char            *s;
 146         int             rc = 0;
 147         int             len;
 148         int             ver;
 149         int             off;
 150
 151         CLASSERT(sizeof(loff_t) >= 4);
 152
 153         off = LNET_PROC_HOFF_GET(*ppos);
 154         ver = LNET_PROC_VER_GET(*ppos);
 155
 156         LASSERT(!write);
 157
 158         if (*lenp == 0)
 159                 return 0;
 160
 161         LIBCFS_ALLOC(tmpstr, tmpsiz);
 162         if (tmpstr == NULL)
 163                 return -ENOMEM;
 164
 165         s = tmpstr; /* points to current position in tmpstr[] */
 166
 167         if (*ppos == 0) {
 168                 s += snprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 169                               the_lnet.ln_routing ? "enabled" : "disabled");
 170                 LASSERT(tmpstr + tmpsiz - s > 0);
 171
 172                 s += snprintf(s, tmpstr + tmpsiz - s, "%-8s %4s %8s %7s %s\n",
 173                               "net", "hops", "priority", "state", "router");
 174                 LASSERT(tmpstr + tmpsiz - s > 0);
 175
 176                 lnet_net_lock(0);
 177                 ver = (unsigned int)the_lnet.ln_remote_nets_version;
 178                 lnet_net_unlock(0);
 179                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 180         } else {
 181                 struct list_head        *n;
 182                 struct list_head        *r;
 183                 struct lnet_route               *route = NULL;
 184                 struct lnet_remotenet   *rnet  = NULL;
 185                 int                     skip  = off - 1;
 186                 struct list_head        *rn_list;
 187                 int                     i;
 188
 189                 lnet_net_lock(0);
 190
 191                 if (ver != LNET_PROC_VERSION(the_lnet.ln_remote_nets_version)) {
 192                         lnet_net_unlock(0);
 193                         LIBCFS_FREE(tmpstr, tmpsiz);
 194                         return -ESTALE;
 195                 }
 196
 197                 for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE && route == NULL;
 198                      i++) {
 199                         rn_list = &the_lnet.ln_remote_nets_hash[i];
 200
 201                         n = rn_list->next;
 202
 203                         while (n != rn_list && route == NULL) {
 204                                 rnet = list_entry(n, struct lnet_remotenet,
 205                                                   lrn_list);
 206
 207                                 r = rnet->lrn_routes.next;
 208
 209                                 while (r != &rnet->lrn_routes) {
 210                                         struct lnet_route *re =
 211                                                 list_entry(r, struct lnet_route,
 212                                                            lr_list);
 213                                         if (skip == 0) {
 214                                                 route = re;
 215                                                 break;
 216                                         }
 217
 218                                         skip--;
 219                                         r = r->next;
 220                                 }
 221
 222                                 n = n->next;
 223                         }
 224                 }
 225
 226                 if (route != NULL) {
 227                         __u32 net = rnet->lrn_net;
 228                         __u32 hops = route->lr_hops;
 229                         unsigned int priority = route->lr_priority;
 230                         int alive = lnet_is_route_alive(route);
 231
 232                         s += snprintf(s, tmpstr + tmpsiz - s,
 233                                       "%-8s %4d %8u %7s %s\n",
 234                                       libcfs_net2str(net), hops,
 235                                       priority,
 236                                       alive ? "up" : "down",
 237                                       /* TODO: replace with actual nid */
 238                                       libcfs_nid2str(LNET_NID_ANY));
 239                         LASSERT(tmpstr + tmpsiz - s > 0);
 240                 }
 241
 242                 lnet_net_unlock(0);
 243         }
 244
 245         len = s - tmpstr;     /* how many bytes was written */
 246
 247         if (len > *lenp) {    /* linux-supplied buffer is too small */
 248                 rc = -EINVAL;
 249         } else if (len > 0) { /* wrote something */
 250                 if (copy_to_user(buffer, tmpstr, len))
 251                         rc = -EFAULT;
 252                 else {
 253                         off += 1;
 254                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 255                 }
 256         }
 257
 258         LIBCFS_FREE(tmpstr, tmpsiz);
 259
 260         if (rc == 0)
 261                 *lenp = len;
 262
 263         return rc;
 264 }
 265
 266 static int
 267 proc_lnet_routers(struct ctl_table *table, int write, void __user *buffer,
 268                   size_t *lenp, loff_t *ppos)
 269 {
 270         int        rc = 0;
 271         char      *tmpstr;
 272         char      *s;
 273         const int  tmpsiz = 256;
 274         int        len;
 275         int        ver;
 276         int        off;
 277
 278         off = LNET_PROC_HOFF_GET(*ppos);
 279         ver = LNET_PROC_VER_GET(*ppos);
 280
 281         LASSERT(!write);
 282
 283         if (*lenp == 0)
 284                 return 0;
 285
 286         LIBCFS_ALLOC(tmpstr, tmpsiz);
 287         if (tmpstr == NULL)
 288                 return -ENOMEM;
 289
 290         s = tmpstr; /* points to current position in tmpstr[] */
 291
 292         if (*ppos == 0) {
 293                 s += snprintf(s, tmpstr + tmpsiz - s,
 294                               "%-4s %7s %5s %s\n",
 295                               "ref", "rtr_ref", "alive", "router");
 296                 LASSERT(tmpstr + tmpsiz - s > 0);
 297
 298                 lnet_net_lock(0);
 299                 ver = (unsigned int)the_lnet.ln_routers_version;
 300                 lnet_net_unlock(0);
 301                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 302         } else {
 303                 struct list_head *r;
 304                 struct lnet_peer *peer = NULL;
 305                 int               skip = off - 1;
 306
 307                 lnet_net_lock(0);
 308
 309                 if (ver != LNET_PROC_VERSION(the_lnet.ln_routers_version)) {
 310                         lnet_net_unlock(0);
 311
 312                         LIBCFS_FREE(tmpstr, tmpsiz);
 313                         return -ESTALE;
 314                 }
 315
 316                 r = the_lnet.ln_routers.next;
 317
 318                 while (r != &the_lnet.ln_routers) {
 319                         struct lnet_peer *lp =
 320                           list_entry(r, struct lnet_peer,
 321                                      lp_rtr_list);
 322
 323                         if (skip == 0) {
 324                                 peer = lp;
 325                                 break;
 326                         }
 327
 328                         skip--;
 329                         r = r->next;
 330                 }
 331
 332                 if (peer != NULL) {
 333                         lnet_nid_t nid = peer->lp_primary_nid;
 334                         int nrefs     = atomic_read(&peer->lp_refcount);
 335                         int nrtrrefs  = peer->lp_rtr_refcount;
 336                         int alive     = lnet_is_gateway_alive(peer);
 337
 338                         s += snprintf(s, tmpstr + tmpsiz - s,
 339                                       "%-4d %7d %5s %s\n",
 340                                       nrefs, nrtrrefs,
 341                                       alive ? "up" : "down",
 342                                       libcfs_nid2str(nid));
 343                 }
 344
 345                 lnet_net_unlock(0);
 346         }
 347
 348         len = s - tmpstr;     /* how many bytes was written */
 349
 350         if (len > *lenp) {    /* linux-supplied buffer is too small */
 351                 rc = -EINVAL;
 352         } else if (len > 0) { /* wrote something */
 353                 if (copy_to_user(buffer, tmpstr, len))
 354                         rc = -EFAULT;
 355                 else {
 356                         off += 1;
 357                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 358                 }
 359         }
 360
 361         LIBCFS_FREE(tmpstr, tmpsiz);
 362
 363         if (rc == 0)
 364                 *lenp = len;
 365
 366         return rc;
 367 }
 368
 369 /* TODO: there should be no direct access to ptable. We should add a set
 370  * of APIs that give access to the ptable and its members */
 371 static int
 372 proc_lnet_peers(struct ctl_table *table, int write, void __user *buffer,
 373                 size_t *lenp, loff_t *ppos)
 374 {
 375         const int               tmpsiz  = 256;
 376         struct lnet_peer_table  *ptable;
 377         char                    *tmpstr = NULL;
 378         char                    *s;
 379         int                     cpt  = LNET_PROC_CPT_GET(*ppos);
 380         int                     ver  = LNET_PROC_VER_GET(*ppos);
 381         int                     hash = LNET_PROC_HASH_GET(*ppos);
 382         int                     hoff = LNET_PROC_HOFF_GET(*ppos);
 383         int                     rc = 0;
 384         int                     len;
 385
 386         if (write) {
 387                 int i;
 388                 struct lnet_peer_ni *peer;
 389
 390                 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
 391                         lnet_net_lock(i);
 392                         for (hash = 0; hash < LNET_PEER_HASH_SIZE; hash++) {
 393                                 list_for_each_entry(peer,
 394                                                     &ptable->pt_hash[hash],
 395                                                     lpni_hashlist) {
 396                                         peer->lpni_mintxcredits =
 397                                                 peer->lpni_txcredits;
 398                                         peer->lpni_minrtrcredits =
 399                                                 peer->lpni_rtrcredits;
 400                                 }
 401                         }
 402                         lnet_net_unlock(i);
 403                 }
 404                 *ppos += *lenp;
 405                 return 0;
 406         }
 407
 408         if (*lenp == 0)
 409                 return 0;
 410
 411         CLASSERT(LNET_PROC_HASH_BITS >= LNET_PEER_HASH_BITS);
 412
 413         if (cpt >= LNET_CPT_NUMBER) {
 414                 *lenp = 0;
 415                 return 0;
 416         }
 417
 418         LIBCFS_ALLOC(tmpstr, tmpsiz);
 419         if (tmpstr == NULL)
 420                 return -ENOMEM;
 421
 422         s = tmpstr; /* points to current position in tmpstr[] */
 423
 424         if (*ppos == 0) {
 425                 s += snprintf(s, tmpstr + tmpsiz - s,
 426                               "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 427                               "nid", "refs", "state", "last", "max",
 428                               "rtr", "min", "tx", "min", "queue");
 429                 LASSERT(tmpstr + tmpsiz - s > 0);
 430
 431                 hoff++;
 432         } else {
 433                 struct lnet_peer_ni     *peer;
 434                 struct list_head        *p;
 435                 int                     skip;
 436
 437  again:
 438                 p = NULL;
 439                 peer = NULL;
 440                 skip = hoff - 1;
 441
 442                 lnet_net_lock(cpt);
 443                 ptable = the_lnet.ln_peer_tables[cpt];
 444                 if (hoff == 1)
 445                         ver = LNET_PROC_VERSION(ptable->pt_version);
 446
 447                 if (ver != LNET_PROC_VERSION(ptable->pt_version)) {
 448                         lnet_net_unlock(cpt);
 449                         LIBCFS_FREE(tmpstr, tmpsiz);
 450                         return -ESTALE;
 451                 }
 452
 453                 while (hash < LNET_PEER_HASH_SIZE) {
 454                         if (p == NULL)
 455                                 p = ptable->pt_hash[hash].next;
 456
 457                         while (p != &ptable->pt_hash[hash]) {
 458                                 struct lnet_peer_ni *lp =
 459                                   list_entry(p, struct lnet_peer_ni,
 460                                              lpni_hashlist);
 461                                 if (skip == 0) {
 462                                         peer = lp;
 463
 464                                         /* minor optimization: start from idx+1
 465                                          * on next iteration if we've just
 466                                          * drained lpni_hashlist */
 467                                         if (lp->lpni_hashlist.next ==
 468                                             &ptable->pt_hash[hash]) {
 469                                                 hoff = 1;
 470                                                 hash++;
 471                                         } else {
 472                                                 hoff++;
 473                                         }
 474
 475                                         break;
 476                                 }
 477
 478                                 skip--;
 479                                 p = lp->lpni_hashlist.next;
 480                         }
 481
 482                         if (peer != NULL)
 483                                 break;
 484
 485                         p = NULL;
 486                         hoff = 1;
 487                         hash++;
 488                 }
 489
 490                 if (peer != NULL) {
 491                         lnet_nid_t nid = peer->lpni_nid;
 492                         int nrefs = atomic_read(&peer->lpni_refcount);
 493                         time64_t lastalive = -1;
 494                         char *aliveness = "NA";
 495                         int maxcr = (peer->lpni_net) ?
 496                           peer->lpni_net->net_tunables.lct_peer_tx_credits : 0;
 497                         int txcr = peer->lpni_txcredits;
 498                         int mintxcr = peer->lpni_mintxcredits;
 499                         int rtrcr = peer->lpni_rtrcredits;
 500                         int minrtrcr = peer->lpni_minrtrcredits;
 501                         int txqnob = peer->lpni_txqnob;
 502
 503                         if (lnet_isrouter(peer) ||
 504                             lnet_peer_aliveness_enabled(peer))
 505                                 aliveness = lnet_is_peer_ni_alive(peer) ?
 506                                         "up" : "down";
 507
 508                         lnet_net_unlock(cpt);
 509
 510                         s += snprintf(s, tmpstr + tmpsiz - s,
 511                                       "%-24s %4d %5s %5lld %5d %5d %5d %5d %5d %d\n",
 512                                       libcfs_nid2str(nid), nrefs, aliveness,
 513                                       lastalive, maxcr, rtrcr, minrtrcr, txcr,
 514                                       mintxcr, txqnob);
 515                         LASSERT(tmpstr + tmpsiz - s > 0);
 516
 517                 } else { /* peer is NULL */
 518                         lnet_net_unlock(cpt);
 519                 }
 520
 521                 if (hash == LNET_PEER_HASH_SIZE) {
 522                         cpt++;
 523                         hash = 0;
 524                         hoff = 1;
 525                         if (peer == NULL && cpt < LNET_CPT_NUMBER)
 526                                 goto again;
 527                 }
 528         }
 529
 530         len = s - tmpstr;     /* how many bytes was written */
 531
 532         if (len > *lenp) {    /* linux-supplied buffer is too small */
 533                 rc = -EINVAL;
 534         } else if (len > 0) { /* wrote something */
 535                 if (copy_to_user(buffer, tmpstr, len))
 536                         rc = -EFAULT;
 537                 else
 538                         *ppos = LNET_PROC_POS_MAKE(cpt, ver, hash, hoff);
 539         }
 540
 541         LIBCFS_FREE(tmpstr, tmpsiz);
 542
 543         if (rc == 0)
 544                 *lenp = len;
 545
 546         return rc;
 547 }
 548
 549 static int __proc_lnet_buffers(void *data, int write,
 550                                loff_t pos, void __user *buffer, int nob)
 551 {
 552         char            *s;
 553         char            *tmpstr;
 554         int             tmpsiz;
 555         int             idx;
 556         int             len;
 557         int             rc;
 558         int             i;
 559
 560         LASSERT(!write);
 561
 562         /* (4 %d) * 4 * LNET_CPT_NUMBER */
 563         tmpsiz = 64 * (LNET_NRBPOOLS + 1) * LNET_CPT_NUMBER;
 564         LIBCFS_ALLOC(tmpstr, tmpsiz);
 565         if (tmpstr == NULL)
 566                 return -ENOMEM;
 567
 568         s = tmpstr; /* points to current position in tmpstr[] */
 569
 570         s += snprintf(s, tmpstr + tmpsiz - s,
 571                       "%5s %5s %7s %7s\n",
 572                       "pages", "count", "credits", "min");
 573         LASSERT(tmpstr + tmpsiz - s > 0);
 574
 575         if (the_lnet.ln_rtrpools == NULL)
 576                 goto out; /* I'm not a router */
 577
 578         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 579                 struct lnet_rtrbufpool *rbp;
 580
 581                 lnet_net_lock(LNET_LOCK_EX);
 582                 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 583                         s += snprintf(s, tmpstr + tmpsiz - s,
 584                                       "%5d %5d %7d %7d\n",
 585                                       rbp[idx].rbp_npages,
 586                                       rbp[idx].rbp_nbuffers,
 587                                       rbp[idx].rbp_credits,
 588                                       rbp[idx].rbp_mincredits);
 589                         LASSERT(tmpstr + tmpsiz - s > 0);
 590                 }
 591                 lnet_net_unlock(LNET_LOCK_EX);
 592         }
 593
 594  out:
 595         len = s - tmpstr;
 596
 597         if (pos >= min_t(int, len, strlen(tmpstr)))
 598                 rc = 0;
 599         else
 600                 rc = cfs_trace_copyout_string(buffer, nob,
 601                                               tmpstr + pos, NULL);
 602
 603         LIBCFS_FREE(tmpstr, tmpsiz);
 604         return rc;
 605 }
 606
 607 static int
 608 proc_lnet_buffers(struct ctl_table *table, int write, void __user *buffer,
 609                   size_t *lenp, loff_t *ppos)
 610 {
 611         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 612                                     __proc_lnet_buffers);
 613 }
 614
 615 static int
 616 proc_lnet_nis(struct ctl_table *table, int write, void __user *buffer,
 617               size_t *lenp, loff_t *ppos)
 618 {
 619         int     tmpsiz = 128 * LNET_CPT_NUMBER;
 620         int     rc = 0;
 621         char    *tmpstr;
 622         char    *s;
 623         int     len;
 624
 625         if (*lenp == 0)
 626                 return 0;
 627
 628         if (write) {
 629                 /* Just reset the min stat. */
 630                 struct lnet_ni  *ni;
 631                 struct lnet_net *net;
 632
 633                 lnet_net_lock(0);
 634
 635                 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 636                         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 637                                 struct lnet_tx_queue *tq;
 638                                 int i;
 639                                 int j;
 640
 641                                 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 642                                         for (j = 0; ni->ni_cpts != NULL &&
 643                                              j < ni->ni_ncpts; j++) {
 644                                                 if (i == ni->ni_cpts[j])
 645                                                         break;
 646                                         }
 647
 648                                         if (j == ni->ni_ncpts)
 649                                                 continue;
 650
 651                                         if (i != 0)
 652                                                 lnet_net_lock(i);
 653                                         tq->tq_credits_min = tq->tq_credits;
 654                                         if (i != 0)
 655                                                 lnet_net_unlock(i);
 656                                 }
 657                         }
 658                 }
 659                 lnet_net_unlock(0);
 660                 *ppos += *lenp;
 661                 return 0;
 662         }
 663
 664         LIBCFS_ALLOC(tmpstr, tmpsiz);
 665         if (tmpstr == NULL)
 666                 return -ENOMEM;
 667
 668         s = tmpstr; /* points to current position in tmpstr[] */
 669
 670         if (*ppos == 0) {
 671                 s += snprintf(s, tmpstr + tmpsiz - s,
 672                               "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 673                               "nid", "status", "alive", "refs", "peer",
 674                               "rtr", "max", "tx", "min");
 675                 LASSERT (tmpstr + tmpsiz - s > 0);
 676         } else {
 677                 struct lnet_ni *ni   = NULL;
 678                 int skip = *ppos - 1;
 679
 680                 lnet_net_lock(0);
 681
 682                 ni = lnet_get_ni_idx_locked(skip);
 683
 684                 if (ni != NULL) {
 685                         struct lnet_tx_queue *tq;
 686                         char *stat;
 687                         time64_t now = ktime_get_real_seconds();
 688                         time64_t last_alive = -1;
 689                         int i;
 690                         int j;
 691
 692                         if (the_lnet.ln_routing)
 693                                 last_alive = now - ni->ni_last_alive;
 694
 695                         /* @lo forever alive */
 696                         if (ni->ni_net->net_lnd->lnd_type == LOLND)
 697                                 last_alive = 0;
 698
 699                         lnet_ni_lock(ni);
 700                         LASSERT(ni->ni_status != NULL);
 701                         stat = (ni->ni_status->ns_status ==
 702                                 LNET_NI_STATUS_UP) ? "up" : "down";
 703                         lnet_ni_unlock(ni);
 704
 705                         /* we actually output credits information for
 706                          * TX queue of each partition */
 707                         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 708                                 for (j = 0; ni->ni_cpts != NULL &&
 709                                      j < ni->ni_ncpts; j++) {
 710                                         if (i == ni->ni_cpts[j])
 711                                                 break;
 712                                 }
 713
 714                                 if (j == ni->ni_ncpts)
 715                                         continue;
 716
 717                                 if (i != 0)
 718                                         lnet_net_lock(i);
 719
 720                                 s += snprintf(s, tmpstr + tmpsiz - s,
 721                                       "%-24s %6s %5lld %4d %4d %4d %5d %5d %5d\n",
 722                                       libcfs_nid2str(ni->ni_nid), stat,
 723                                       last_alive, *ni->ni_refs[i],
 724                                       ni->ni_net->net_tunables.lct_peer_tx_credits,
 725                                       ni->ni_net->net_tunables.lct_peer_rtr_credits,
 726                                       tq->tq_credits_max,
 727                                       tq->tq_credits, tq->tq_credits_min);
 728                                 if (i != 0)
 729                                         lnet_net_unlock(i);
 730                         }
 731                         LASSERT(tmpstr + tmpsiz - s > 0);
 732                 }
 733
 734                 lnet_net_unlock(0);
 735         }
 736
 737         len = s - tmpstr;     /* how many bytes was written */
 738
 739         if (len > *lenp) {    /* linux-supplied buffer is too small */
 740                 rc = -EINVAL;
 741         } else if (len > 0) { /* wrote something */
 742                 if (copy_to_user(buffer, tmpstr, len))
 743                         rc = -EFAULT;
 744                 else
 745                         *ppos += 1;
 746         }
 747
 748         LIBCFS_FREE(tmpstr, tmpsiz);
 749
 750         if (rc == 0)
 751                 *lenp = len;
 752
 753         return rc;
 754 }
 755
 756 struct lnet_portal_rotors {
 757         int             pr_value;
 758         const char      *pr_name;
 759         const char      *pr_desc;
 760 };
 761
 762 static struct lnet_portal_rotors        portal_rotors[] = {
 763         {
 764                 .pr_value = LNET_PTL_ROTOR_OFF,
 765                 .pr_name  = "OFF",
 766                 .pr_desc  = "Turn off message rotor for wildcard portals"
 767         },
 768         {
 769                 .pr_value = LNET_PTL_ROTOR_ON,
 770                 .pr_name  = "ON",
 771                 .pr_desc  = "round-robin dispatch all PUT messages for "
 772                             "wildcard portals"
 773         },
 774         {
 775                 .pr_value = LNET_PTL_ROTOR_RR_RT,
 776                 .pr_name  = "RR_RT",
 777                 .pr_desc  = "round-robin dispatch routed PUT message for "
 778                             "wildcard portals"
 779         },
 780         {
 781                 .pr_value = LNET_PTL_ROTOR_HASH_RT,
 782                 .pr_name  = "HASH_RT",
 783                 .pr_desc  = "dispatch routed PUT message by hashing source "
 784                             "NID for wildcard portals"
 785         },
 786         {
 787                 .pr_value = -1,
 788                 .pr_name  = NULL,
 789                 .pr_desc  = NULL
 790         },
 791 };
 792
 793 static int __proc_lnet_portal_rotor(void *data, int write,
 794                                     loff_t pos, void __user *buffer, int nob)
 795 {
 796         const int       buf_len = 128;
 797         char            *buf;
 798         char            *tmp;
 799         int             rc;
 800         int             i;
 801
 802         LIBCFS_ALLOC(buf, buf_len);
 803         if (buf == NULL)
 804                 return -ENOMEM;
 805
 806         if (!write) {
 807                 lnet_res_lock(0);
 808
 809                 for (i = 0; portal_rotors[i].pr_value >= 0; i++) {
 810                         if (portal_rotors[i].pr_value == portal_rotor)
 811                                 break;
 812                 }
 813
 814                 LASSERT(portal_rotors[i].pr_value == portal_rotor);
 815                 lnet_res_unlock(0);
 816
 817                 rc = snprintf(buf, buf_len,
 818                               "{\n\tportals: all\n"
 819                               "\trotor: %s\n\tdescription: %s\n}",
 820                               portal_rotors[i].pr_name,
 821                               portal_rotors[i].pr_desc);
 822
 823                 if (pos >= min_t(int, rc, buf_len)) {
 824                         rc = 0;
 825                 } else {
 826                         rc = cfs_trace_copyout_string(buffer, nob,
 827                                         buf + pos, "\n");
 828                 }
 829                 goto out;
 830         }
 831
 832         rc = cfs_trace_copyin_string(buf, buf_len, buffer, nob);
 833         if (rc < 0)
 834                 goto out;
 835
 836         tmp = strim(buf);
 837
 838         rc = -EINVAL;
 839         lnet_res_lock(0);
 840         for (i = 0; portal_rotors[i].pr_name != NULL; i++) {
 841                 if (strncasecmp(portal_rotors[i].pr_name, tmp,
 842                                 strlen(portal_rotors[i].pr_name)) == 0) {
 843                         portal_rotor = portal_rotors[i].pr_value;
 844                         rc = 0;
 845                         break;
 846                 }
 847         }
 848         lnet_res_unlock(0);
 849 out:
 850         LIBCFS_FREE(buf, buf_len);
 851         return rc;
 852 }
 853
 854 static int
 855 proc_lnet_portal_rotor(struct ctl_table *table, int write, void __user *buffer,
 856                        size_t *lenp, loff_t *ppos)
 857 {
 858         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 859                                     __proc_lnet_portal_rotor);
 860 }
 861
 862
 863 static struct ctl_table lnet_table[] = {
 864         /*
 865          * NB No .strategy entries have been provided since sysctl(8) prefers
 866          * to go via /proc for portability.
 867          */
 868         {
 869                 INIT_CTL_NAME
 870                 .procname       = "stats",
 871                 .mode           = 0644,
 872                 .proc_handler   = &proc_lnet_stats,
 873         },
 874         {
 875                 INIT_CTL_NAME
 876                 .procname       = "routes",
 877                 .mode           = 0444,
 878                 .proc_handler   = &proc_lnet_routes,
 879         },
 880         {
 881                 INIT_CTL_NAME
 882                 .procname       = "routers",
 883                 .mode           = 0444,
 884                 .proc_handler   = &proc_lnet_routers,
 885         },
 886         {
 887                 INIT_CTL_NAME
 888                 .procname       = "peers",
 889                 .mode           = 0644,
 890                 .proc_handler   = &proc_lnet_peers,
 891         },
 892         {
 893                 INIT_CTL_NAME
 894                 .procname       = "buffers",
 895                 .mode           = 0444,
 896                 .proc_handler   = &proc_lnet_buffers,
 897         },
 898         {
 899                 INIT_CTL_NAME
 900                 .procname       = "nis",
 901                 .mode           = 0644,
 902                 .proc_handler   = &proc_lnet_nis,
 903         },
 904         {
 905                 INIT_CTL_NAME
 906                 .procname       = "portal_rotor",
 907                 .mode           = 0644,
 908                 .proc_handler   = &proc_lnet_portal_rotor,
 909         },
 910         { .procname = NULL }
 911 };
 912
 913 void lnet_router_debugfs_init(void)
 914 {
 915         lnet_insert_debugfs(lnet_table);
 916 }
 917
 918 void lnet_router_debugfs_fini(void)
 919 {
 920         lnet_remove_debugfs(lnet_table);
 921 }