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 = scnprintf(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 >= len)
 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         BUILD_BUG_ON(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 += scnprintf(s, tmpstr + tmpsiz - s, "Routing %s\n",
 169                                the_lnet.ln_routing ? "enabled" : "disabled");
 170                 LASSERT(tmpstr + tmpsiz - s > 0);
 171
 172                 s += scnprintf(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 += scnprintf(s, tmpstr + tmpsiz - s,
 233                                        "%-8s %4d %8u %7s %s\n",
 234                                        libcfs_net2str(net), hops,
 235                                        priority,
 236                                        alive ? "up" : "down",
 237                                        libcfs_nid2str(route->lr_nid));
 238                         LASSERT(tmpstr + tmpsiz - s > 0);
 239                 }
 240
 241                 lnet_net_unlock(0);
 242         }
 243
 244         len = s - tmpstr;     /* how many bytes was written */
 245
 246         if (len > *lenp) {    /* linux-supplied buffer is too small */
 247                 rc = -EINVAL;
 248         } else if (len > 0) { /* wrote something */
 249                 if (copy_to_user(buffer, tmpstr, len))
 250                         rc = -EFAULT;
 251                 else {
 252                         off += 1;
 253                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 254                 }
 255         }
 256
 257         LIBCFS_FREE(tmpstr, tmpsiz);
 258
 259         if (rc == 0)
 260                 *lenp = len;
 261
 262         return rc;
 263 }
 264
 265 static int
 266 proc_lnet_routers(struct ctl_table *table, int write, void __user *buffer,
 267                   size_t *lenp, loff_t *ppos)
 268 {
 269         int        rc = 0;
 270         char      *tmpstr;
 271         char      *s;
 272         const int  tmpsiz = 256;
 273         int        len;
 274         int        ver;
 275         int        off;
 276
 277         off = LNET_PROC_HOFF_GET(*ppos);
 278         ver = LNET_PROC_VER_GET(*ppos);
 279
 280         LASSERT(!write);
 281
 282         if (*lenp == 0)
 283                 return 0;
 284
 285         LIBCFS_ALLOC(tmpstr, tmpsiz);
 286         if (tmpstr == NULL)
 287                 return -ENOMEM;
 288
 289         s = tmpstr; /* points to current position in tmpstr[] */
 290
 291         if (*ppos == 0) {
 292                 s += scnprintf(s, tmpstr + tmpsiz - s,
 293                                "%-4s %7s %5s %s\n",
 294                                "ref", "rtr_ref", "alive", "router");
 295                 LASSERT(tmpstr + tmpsiz - s > 0);
 296
 297                 lnet_net_lock(0);
 298                 ver = (unsigned int)the_lnet.ln_routers_version;
 299                 lnet_net_unlock(0);
 300                 *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 301         } else {
 302                 struct list_head *r;
 303                 struct lnet_peer *peer = NULL;
 304                 int               skip = off - 1;
 305
 306                 lnet_net_lock(0);
 307
 308                 if (ver != LNET_PROC_VERSION(the_lnet.ln_routers_version)) {
 309                         lnet_net_unlock(0);
 310
 311                         LIBCFS_FREE(tmpstr, tmpsiz);
 312                         return -ESTALE;
 313                 }
 314
 315                 r = the_lnet.ln_routers.next;
 316
 317                 while (r != &the_lnet.ln_routers) {
 318                         struct lnet_peer *lp =
 319                           list_entry(r, struct lnet_peer,
 320                                      lp_rtr_list);
 321
 322                         if (skip == 0) {
 323                                 peer = lp;
 324                                 break;
 325                         }
 326
 327                         skip--;
 328                         r = r->next;
 329                 }
 330
 331                 if (peer != NULL) {
 332                         lnet_nid_t nid = peer->lp_primary_nid;
 333                         int nrefs     = atomic_read(&peer->lp_refcount);
 334                         int nrtrrefs  = peer->lp_rtr_refcount;
 335                         int alive     = lnet_is_gateway_alive(peer);
 336
 337                         s += scnprintf(s, tmpstr + tmpsiz - s,
 338                                        "%-4d %7d %5s %s\n",
 339                                        nrefs, nrtrrefs,
 340                                        alive ? "up" : "down",
 341                                        libcfs_nid2str(nid));
 342                 }
 343
 344                 lnet_net_unlock(0);
 345         }
 346
 347         len = s - tmpstr;     /* how many bytes was written */
 348
 349         if (len > *lenp) {    /* linux-supplied buffer is too small */
 350                 rc = -EINVAL;
 351         } else if (len > 0) { /* wrote something */
 352                 if (copy_to_user(buffer, tmpstr, len))
 353                         rc = -EFAULT;
 354                 else {
 355                         off += 1;
 356                         *ppos = LNET_PROC_POS_MAKE(0, ver, 0, off);
 357                 }
 358         }
 359
 360         LIBCFS_FREE(tmpstr, tmpsiz);
 361
 362         if (rc == 0)
 363                 *lenp = len;
 364
 365         return rc;
 366 }
 367
 368 /* TODO: there should be no direct access to ptable. We should add a set
 369  * of APIs that give access to the ptable and its members */
 370 static int
 371 proc_lnet_peers(struct ctl_table *table, int write, void __user *buffer,
 372                 size_t *lenp, loff_t *ppos)
 373 {
 374         const int               tmpsiz  = 256;
 375         struct lnet_peer_table  *ptable;
 376         char                    *tmpstr = NULL;
 377         char                    *s;
 378         int                     cpt  = LNET_PROC_CPT_GET(*ppos);
 379         int                     ver  = LNET_PROC_VER_GET(*ppos);
 380         int                     hash = LNET_PROC_HASH_GET(*ppos);
 381         int                     hoff = LNET_PROC_HOFF_GET(*ppos);
 382         int                     rc = 0;
 383         int                     len;
 384
 385         if (write) {
 386                 int i;
 387                 struct lnet_peer_ni *peer;
 388
 389                 cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
 390                         lnet_net_lock(i);
 391                         for (hash = 0; hash < LNET_PEER_HASH_SIZE; hash++) {
 392                                 list_for_each_entry(peer,
 393                                                     &ptable->pt_hash[hash],
 394                                                     lpni_hashlist) {
 395                                         peer->lpni_mintxcredits =
 396                                                 peer->lpni_txcredits;
 397                                         peer->lpni_minrtrcredits =
 398                                                 peer->lpni_rtrcredits;
 399                                 }
 400                         }
 401                         lnet_net_unlock(i);
 402                 }
 403                 *ppos += *lenp;
 404                 return 0;
 405         }
 406
 407         if (*lenp == 0)
 408                 return 0;
 409
 410         BUILD_BUG_ON(LNET_PROC_HASH_BITS < LNET_PEER_HASH_BITS);
 411
 412         if (cpt >= LNET_CPT_NUMBER) {
 413                 *lenp = 0;
 414                 return 0;
 415         }
 416
 417         LIBCFS_ALLOC(tmpstr, tmpsiz);
 418         if (tmpstr == NULL)
 419                 return -ENOMEM;
 420
 421         s = tmpstr; /* points to current position in tmpstr[] */
 422
 423         if (*ppos == 0) {
 424                 s += scnprintf(s, tmpstr + tmpsiz - s,
 425                                "%-24s %4s %5s %5s %5s %5s %5s %5s %5s %s\n",
 426                                "nid", "refs", "state", "last", "max",
 427                                "rtr", "min", "tx", "min", "queue");
 428                 LASSERT(tmpstr + tmpsiz - s > 0);
 429
 430                 hoff++;
 431         } else {
 432                 struct lnet_peer_ni     *peer;
 433                 struct list_head        *p;
 434                 int                     skip;
 435
 436  again:
 437                 p = NULL;
 438                 peer = NULL;
 439                 skip = hoff - 1;
 440
 441                 lnet_net_lock(cpt);
 442                 ptable = the_lnet.ln_peer_tables[cpt];
 443                 if (hoff == 1)
 444                         ver = LNET_PROC_VERSION(ptable->pt_version);
 445
 446                 if (ver != LNET_PROC_VERSION(ptable->pt_version)) {
 447                         lnet_net_unlock(cpt);
 448                         LIBCFS_FREE(tmpstr, tmpsiz);
 449                         return -ESTALE;
 450                 }
 451
 452                 while (hash < LNET_PEER_HASH_SIZE) {
 453                         if (p == NULL)
 454                                 p = ptable->pt_hash[hash].next;
 455
 456                         while (p != &ptable->pt_hash[hash]) {
 457                                 struct lnet_peer_ni *lp =
 458                                   list_entry(p, struct lnet_peer_ni,
 459                                              lpni_hashlist);
 460                                 if (skip == 0) {
 461                                         peer = lp;
 462
 463                                         /* minor optimization: start from idx+1
 464                                          * on next iteration if we've just
 465                                          * drained lpni_hashlist */
 466                                         if (lp->lpni_hashlist.next ==
 467                                             &ptable->pt_hash[hash]) {
 468                                                 hoff = 1;
 469                                                 hash++;
 470                                         } else {
 471                                                 hoff++;
 472                                         }
 473
 474                                         break;
 475                                 }
 476
 477                                 skip--;
 478                                 p = lp->lpni_hashlist.next;
 479                         }
 480
 481                         if (peer != NULL)
 482                                 break;
 483
 484                         p = NULL;
 485                         hoff = 1;
 486                         hash++;
 487                 }
 488
 489                 if (peer != NULL) {
 490                         lnet_nid_t nid = peer->lpni_nid;
 491                         int nrefs = atomic_read(&peer->lpni_refcount);
 492                         time64_t lastalive = -1;
 493                         char *aliveness = "NA";
 494                         int maxcr = (peer->lpni_net) ?
 495                           peer->lpni_net->net_tunables.lct_peer_tx_credits : 0;
 496                         int txcr = peer->lpni_txcredits;
 497                         int mintxcr = peer->lpni_mintxcredits;
 498                         int rtrcr = peer->lpni_rtrcredits;
 499                         int minrtrcr = peer->lpni_minrtrcredits;
 500                         int txqnob = peer->lpni_txqnob;
 501
 502                         if (lnet_isrouter(peer) ||
 503                             lnet_peer_aliveness_enabled(peer))
 504                                 aliveness = lnet_is_peer_ni_alive(peer) ?
 505                                         "up" : "down";
 506
 507                         lnet_net_unlock(cpt);
 508
 509                         s += scnprintf(s, tmpstr + tmpsiz - s,
 510                                        "%-24s %4d %5s %5lld %5d %5d %5d %5d %5d %d\n",
 511                                        libcfs_nid2str(nid), nrefs, aliveness,
 512                                        lastalive, maxcr, rtrcr, minrtrcr, txcr,
 513                                        mintxcr, txqnob);
 514                         LASSERT(tmpstr + tmpsiz - s > 0);
 515
 516                 } else { /* peer is NULL */
 517                         lnet_net_unlock(cpt);
 518                 }
 519
 520                 if (hash == LNET_PEER_HASH_SIZE) {
 521                         cpt++;
 522                         hash = 0;
 523                         hoff = 1;
 524                         if (peer == NULL && cpt < LNET_CPT_NUMBER)
 525                                 goto again;
 526                 }
 527         }
 528
 529         len = s - tmpstr;     /* how many bytes was written */
 530
 531         if (len > *lenp) {    /* linux-supplied buffer is too small */
 532                 rc = -EINVAL;
 533         } else if (len > 0) { /* wrote something */
 534                 if (copy_to_user(buffer, tmpstr, len))
 535                         rc = -EFAULT;
 536                 else
 537                         *ppos = LNET_PROC_POS_MAKE(cpt, ver, hash, hoff);
 538         }
 539
 540         LIBCFS_FREE(tmpstr, tmpsiz);
 541
 542         if (rc == 0)
 543                 *lenp = len;
 544
 545         return rc;
 546 }
 547
 548 static int __proc_lnet_buffers(void *data, int write,
 549                                loff_t pos, void __user *buffer, int nob)
 550 {
 551         char            *s;
 552         char            *tmpstr;
 553         int             tmpsiz;
 554         int             idx;
 555         int             len;
 556         int             rc;
 557         int             i;
 558
 559         LASSERT(!write);
 560
 561         /* (4 %d) * 4 * LNET_CPT_NUMBER */
 562         tmpsiz = 64 * (LNET_NRBPOOLS + 1) * LNET_CPT_NUMBER;
 563         LIBCFS_ALLOC(tmpstr, tmpsiz);
 564         if (tmpstr == NULL)
 565                 return -ENOMEM;
 566
 567         s = tmpstr; /* points to current position in tmpstr[] */
 568
 569         s += scnprintf(s, tmpstr + tmpsiz - s,
 570                        "%5s %5s %7s %7s\n",
 571                        "pages", "count", "credits", "min");
 572         LASSERT(tmpstr + tmpsiz - s > 0);
 573
 574         if (the_lnet.ln_rtrpools == NULL)
 575                 goto out; /* I'm not a router */
 576
 577         for (idx = 0; idx < LNET_NRBPOOLS; idx++) {
 578                 struct lnet_rtrbufpool *rbp;
 579
 580                 lnet_net_lock(LNET_LOCK_EX);
 581                 cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
 582                         s += scnprintf(s, tmpstr + tmpsiz - s,
 583                                        "%5d %5d %7d %7d\n",
 584                                        rbp[idx].rbp_npages,
 585                                        rbp[idx].rbp_nbuffers,
 586                                        rbp[idx].rbp_credits,
 587                                        rbp[idx].rbp_mincredits);
 588                         LASSERT(tmpstr + tmpsiz - s > 0);
 589                 }
 590                 lnet_net_unlock(LNET_LOCK_EX);
 591         }
 592
 593  out:
 594         len = s - tmpstr;
 595
 596         if (pos >= min_t(int, len, strlen(tmpstr)))
 597                 rc = 0;
 598         else
 599                 rc = cfs_trace_copyout_string(buffer, nob,
 600                                               tmpstr + pos, NULL);
 601
 602         LIBCFS_FREE(tmpstr, tmpsiz);
 603         return rc;
 604 }
 605
 606 static int
 607 proc_lnet_buffers(struct ctl_table *table, int write, void __user *buffer,
 608                   size_t *lenp, loff_t *ppos)
 609 {
 610         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 611                                     __proc_lnet_buffers);
 612 }
 613
 614 static int
 615 proc_lnet_nis(struct ctl_table *table, int write, void __user *buffer,
 616               size_t *lenp, loff_t *ppos)
 617 {
 618         int     tmpsiz = 128 * LNET_CPT_NUMBER;
 619         int     rc = 0;
 620         char    *tmpstr;
 621         char    *s;
 622         int     len;
 623
 624         if (*lenp == 0)
 625                 return 0;
 626
 627         if (write) {
 628                 /* Just reset the min stat. */
 629                 struct lnet_ni  *ni;
 630                 struct lnet_net *net;
 631
 632                 lnet_net_lock(0);
 633
 634                 list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
 635                         list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
 636                                 struct lnet_tx_queue *tq;
 637                                 int i;
 638                                 int j;
 639
 640                                 cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 641                                         for (j = 0; ni->ni_cpts != NULL &&
 642                                              j < ni->ni_ncpts; j++) {
 643                                                 if (i == ni->ni_cpts[j])
 644                                                         break;
 645                                         }
 646
 647                                         if (j == ni->ni_ncpts)
 648                                                 continue;
 649
 650                                         if (i != 0)
 651                                                 lnet_net_lock(i);
 652                                         tq->tq_credits_min = tq->tq_credits;
 653                                         if (i != 0)
 654                                                 lnet_net_unlock(i);
 655                                 }
 656                         }
 657                 }
 658                 lnet_net_unlock(0);
 659                 *ppos += *lenp;
 660                 return 0;
 661         }
 662
 663         LIBCFS_ALLOC(tmpstr, tmpsiz);
 664         if (tmpstr == NULL)
 665                 return -ENOMEM;
 666
 667         s = tmpstr; /* points to current position in tmpstr[] */
 668
 669         if (*ppos == 0) {
 670                 s += scnprintf(s, tmpstr + tmpsiz - s,
 671                                "%-24s %6s %5s %4s %4s %4s %5s %5s %5s\n",
 672                                "nid", "status", "alive", "refs", "peer",
 673                                "rtr", "max", "tx", "min");
 674                 LASSERT (tmpstr + tmpsiz - s > 0);
 675         } else {
 676                 struct lnet_ni *ni   = NULL;
 677                 int skip = *ppos - 1;
 678
 679                 lnet_net_lock(0);
 680
 681                 ni = lnet_get_ni_idx_locked(skip);
 682
 683                 if (ni != NULL) {
 684                         struct lnet_tx_queue *tq;
 685                         char *stat;
 686                         time64_t now = ktime_get_real_seconds();
 687                         time64_t last_alive = -1;
 688                         int i;
 689                         int j;
 690
 691                         if (the_lnet.ln_routing)
 692                                 last_alive = now - ni->ni_net->net_last_alive;
 693
 694                         lnet_ni_lock(ni);
 695                         LASSERT(ni->ni_status != NULL);
 696                         stat = (ni->ni_status->ns_status ==
 697                                 LNET_NI_STATUS_UP) ? "up" : "down";
 698                         lnet_ni_unlock(ni);
 699
 700                         /* @lo forever alive */
 701                         if (ni->ni_net->net_lnd->lnd_type == LOLND) {
 702                                 last_alive = 0;
 703                                 stat = "up";
 704                         }
 705
 706                         /* we actually output credits information for
 707                          * TX queue of each partition */
 708                         cfs_percpt_for_each(tq, i, ni->ni_tx_queues) {
 709                                 for (j = 0; ni->ni_cpts != NULL &&
 710                                      j < ni->ni_ncpts; j++) {
 711                                         if (i == ni->ni_cpts[j])
 712                                                 break;
 713                                 }
 714
 715                                 if (j == ni->ni_ncpts)
 716                                         continue;
 717
 718                                 if (i != 0)
 719                                         lnet_net_lock(i);
 720
 721                                 s += scnprintf(s, tmpstr + tmpsiz - s,
 722                                        "%-24s %6s %5lld %4d %4d %4d %5d %5d %5d\n",
 723                                        libcfs_nid2str(ni->ni_nid), stat,
 724                                        last_alive, *ni->ni_refs[i],
 725                                        ni->ni_net->net_tunables.lct_peer_tx_credits,
 726                                        ni->ni_net->net_tunables.lct_peer_rtr_credits,
 727                                        tq->tq_credits_max,
 728                                        tq->tq_credits, tq->tq_credits_min);
 729                                 if (i != 0)
 730                                         lnet_net_unlock(i);
 731                         }
 732                         LASSERT(tmpstr + tmpsiz - s > 0);
 733                 }
 734
 735                 lnet_net_unlock(0);
 736         }
 737
 738         len = s - tmpstr;     /* how many bytes was written */
 739
 740         if (len > *lenp) {    /* linux-supplied buffer is too small */
 741                 rc = -EINVAL;
 742         } else if (len > 0) { /* wrote something */
 743                 if (copy_to_user(buffer, tmpstr, len))
 744                         rc = -EFAULT;
 745                 else
 746                         *ppos += 1;
 747         }
 748
 749         LIBCFS_FREE(tmpstr, tmpsiz);
 750
 751         if (rc == 0)
 752                 *lenp = len;
 753
 754         return rc;
 755 }
 756
 757 struct lnet_portal_rotors {
 758         int             pr_value;
 759         const char      *pr_name;
 760         const char      *pr_desc;
 761 };
 762
 763 static struct lnet_portal_rotors        portal_rotors[] = {
 764         {
 765                 .pr_value = LNET_PTL_ROTOR_OFF,
 766                 .pr_name  = "OFF",
 767                 .pr_desc  = "Turn off message rotor for wildcard portals"
 768         },
 769         {
 770                 .pr_value = LNET_PTL_ROTOR_ON,
 771                 .pr_name  = "ON",
 772                 .pr_desc  = "round-robin dispatch all PUT messages for "
 773                             "wildcard portals"
 774         },
 775         {
 776                 .pr_value = LNET_PTL_ROTOR_RR_RT,
 777                 .pr_name  = "RR_RT",
 778                 .pr_desc  = "round-robin dispatch routed PUT message for "
 779                             "wildcard portals"
 780         },
 781         {
 782                 .pr_value = LNET_PTL_ROTOR_HASH_RT,
 783                 .pr_name  = "HASH_RT",
 784                 .pr_desc  = "dispatch routed PUT message by hashing source "
 785                             "NID for wildcard portals"
 786         },
 787         {
 788                 .pr_value = -1,
 789                 .pr_name  = NULL,
 790                 .pr_desc  = NULL
 791         },
 792 };
 793
 794 static int __proc_lnet_portal_rotor(void *data, int write,
 795                                     loff_t pos, void __user *buffer, int nob)
 796 {
 797         const int       buf_len = 128;
 798         char            *buf;
 799         char            *tmp;
 800         int             rc;
 801         int             i;
 802
 803         LIBCFS_ALLOC(buf, buf_len);
 804         if (buf == NULL)
 805                 return -ENOMEM;
 806
 807         if (!write) {
 808                 lnet_res_lock(0);
 809
 810                 for (i = 0; portal_rotors[i].pr_value >= 0; i++) {
 811                         if (portal_rotors[i].pr_value == portal_rotor)
 812                                 break;
 813                 }
 814
 815                 LASSERT(portal_rotors[i].pr_value == portal_rotor);
 816                 lnet_res_unlock(0);
 817
 818                 rc = scnprintf(buf, buf_len,
 819                                "{\n\tportals: all\n"
 820                                "\trotor: %s\n\tdescription: %s\n}",
 821                                portal_rotors[i].pr_name,
 822                                portal_rotors[i].pr_desc);
 823
 824                 if (pos >= min_t(int, rc, buf_len)) {
 825                         rc = 0;
 826                 } else {
 827                         rc = cfs_trace_copyout_string(buffer, nob,
 828                                         buf + pos, "\n");
 829                 }
 830                 goto out;
 831         }
 832
 833         rc = cfs_trace_copyin_string(buf, buf_len, buffer, nob);
 834         if (rc < 0)
 835                 goto out;
 836
 837         tmp = strim(buf);
 838
 839         rc = -EINVAL;
 840         lnet_res_lock(0);
 841         for (i = 0; portal_rotors[i].pr_name != NULL; i++) {
 842                 if (strncasecmp(portal_rotors[i].pr_name, tmp,
 843                                 strlen(portal_rotors[i].pr_name)) == 0) {
 844                         portal_rotor = portal_rotors[i].pr_value;
 845                         rc = 0;
 846                         break;
 847                 }
 848         }
 849         lnet_res_unlock(0);
 850 out:
 851         LIBCFS_FREE(buf, buf_len);
 852         return rc;
 853 }
 854
 855 static int
 856 proc_lnet_portal_rotor(struct ctl_table *table, int write, void __user *buffer,
 857                        size_t *lenp, loff_t *ppos)
 858 {
 859         return lprocfs_call_handler(table->data, write, ppos, buffer, lenp,
 860                                     __proc_lnet_portal_rotor);
 861 }
 862
 863
 864 static struct ctl_table lnet_table[] = {
 865         /*
 866          * NB No .strategy entries have been provided since sysctl(8) prefers
 867          * to go via /proc for portability.
 868          */
 869         {
 870                 INIT_CTL_NAME
 871                 .procname       = "stats",
 872                 .mode           = 0644,
 873                 .proc_handler   = &proc_lnet_stats,
 874         },
 875         {
 876                 INIT_CTL_NAME
 877                 .procname       = "routes",
 878                 .mode           = 0444,
 879                 .proc_handler   = &proc_lnet_routes,
 880         },
 881         {
 882                 INIT_CTL_NAME
 883                 .procname       = "routers",
 884                 .mode           = 0444,
 885                 .proc_handler   = &proc_lnet_routers,
 886         },
 887         {
 888                 INIT_CTL_NAME
 889                 .procname       = "peers",
 890                 .mode           = 0644,
 891                 .proc_handler   = &proc_lnet_peers,
 892         },
 893         {
 894                 INIT_CTL_NAME
 895                 .procname       = "buffers",
 896                 .mode           = 0444,
 897                 .proc_handler   = &proc_lnet_buffers,
 898         },
 899         {
 900                 INIT_CTL_NAME
 901                 .procname       = "nis",
 902                 .mode           = 0644,
 903                 .proc_handler   = &proc_lnet_nis,
 904         },
 905         {
 906                 INIT_CTL_NAME
 907                 .procname       = "portal_rotor",
 908                 .mode           = 0644,
 909                 .proc_handler   = &proc_lnet_portal_rotor,
 910         },
 911         { .procname = NULL }
 912 };
 913
 914 void lnet_router_debugfs_init(void)
 915 {
 916         lnet_insert_debugfs(lnet_table);
 917 }
 918
 919 void lnet_router_debugfs_fini(void)
 920 {
 921         lnet_remove_debugfs(lnet_table);
 922 }