fs/ocfs2/cluster/netdebug.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * netdebug.c
   5  *
   6  * debug functionality for o2net
   7  *
   8  * Copyright (C) 2005, 2008 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  *
  25  */
  26
  27 #ifdef CONFIG_DEBUG_FS
  28
  29 #include <linux/module.h>
  30 #include <linux/types.h>
  31 #include <linux/slab.h>
  32 #include <linux/idr.h>
  33 #include <linux/kref.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/debugfs.h>
  36
  37 #include <linux/uaccess.h>
  38
  39 #include "tcp.h"
  40 #include "nodemanager.h"
  41 #define MLOG_MASK_PREFIX ML_TCP
  42 #include "masklog.h"
  43
  44 #include "tcp_internal.h"
  45
  46 #define O2NET_DEBUG_DIR         "o2net"
  47 #define SC_DEBUG_NAME           "sock_containers"
  48 #define NST_DEBUG_NAME          "send_tracking"
  49 #define STATS_DEBUG_NAME        "stats"
  50
  51 #define SHOW_SOCK_CONTAINERS    0
  52 #define SHOW_SOCK_STATS         1
  53
  54 static struct dentry *o2net_dentry;
  55 static struct dentry *sc_dentry;
  56 static struct dentry *nst_dentry;
  57 static struct dentry *stats_dentry;
  58
  59 static DEFINE_SPINLOCK(o2net_debug_lock);
  60
  61 static LIST_HEAD(sock_containers);
  62 static LIST_HEAD(send_tracking);
  63
  64 void o2net_debug_add_nst(struct o2net_send_tracking *nst)
  65 {
  66         spin_lock(&o2net_debug_lock);
  67         list_add(&nst->st_net_debug_item, &send_tracking);
  68         spin_unlock(&o2net_debug_lock);
  69 }
  70
  71 void o2net_debug_del_nst(struct o2net_send_tracking *nst)
  72 {
  73         spin_lock(&o2net_debug_lock);
  74         if (!list_empty(&nst->st_net_debug_item))
  75                 list_del_init(&nst->st_net_debug_item);
  76         spin_unlock(&o2net_debug_lock);
  77 }
  78
  79 static struct o2net_send_tracking
  80                         *next_nst(struct o2net_send_tracking *nst_start)
  81 {
  82         struct o2net_send_tracking *nst, *ret = NULL;
  83
  84         assert_spin_locked(&o2net_debug_lock);
  85
  86         list_for_each_entry(nst, &nst_start->st_net_debug_item,
  87                             st_net_debug_item) {
  88                 /* discover the head of the list */
  89                 if (&nst->st_net_debug_item == &send_tracking)
  90                         break;
  91
  92                 /* use st_task to detect real nsts in the list */
  93                 if (nst->st_task != NULL) {
  94                         ret = nst;
  95                         break;
  96                 }
  97         }
  98
  99         return ret;
 100 }
 101
 102 static void *nst_seq_start(struct seq_file *seq, loff_t *pos)
 103 {
 104         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
 105
 106         spin_lock(&o2net_debug_lock);
 107         nst = next_nst(dummy_nst);
 108         spin_unlock(&o2net_debug_lock);
 109
 110         return nst;
 111 }
 112
 113 static void *nst_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 114 {
 115         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
 116
 117         spin_lock(&o2net_debug_lock);
 118         nst = next_nst(dummy_nst);
 119         list_del_init(&dummy_nst->st_net_debug_item);
 120         if (nst)
 121                 list_add(&dummy_nst->st_net_debug_item,
 122                          &nst->st_net_debug_item);
 123         spin_unlock(&o2net_debug_lock);
 124
 125         return nst; /* unused, just needs to be null when done */
 126 }
 127
 128 static int nst_seq_show(struct seq_file *seq, void *v)
 129 {
 130         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
 131         ktime_t now;
 132         s64 sock, send, status;
 133
 134         spin_lock(&o2net_debug_lock);
 135         nst = next_nst(dummy_nst);
 136         if (!nst)
 137                 goto out;
 138
 139         now = ktime_get();
 140         sock = ktime_to_us(ktime_sub(now, nst->st_sock_time));
 141         send = ktime_to_us(ktime_sub(now, nst->st_send_time));
 142         status = ktime_to_us(ktime_sub(now, nst->st_status_time));
 143
 144         /* get_task_comm isn't exported.  oh well. */
 145         seq_printf(seq, "%p:\n"
 146                    "  pid:          %lu\n"
 147                    "  tgid:         %lu\n"
 148                    "  process name: %s\n"
 149                    "  node:         %u\n"
 150                    "  sc:           %p\n"
 151                    "  message id:   %d\n"
 152                    "  message type: %u\n"
 153                    "  message key:  0x%08x\n"
 154                    "  sock acquiry: %lld usecs ago\n"
 155                    "  send start:   %lld usecs ago\n"
 156                    "  wait start:   %lld usecs ago\n",
 157                    nst, (unsigned long)task_pid_nr(nst->st_task),
 158                    (unsigned long)nst->st_task->tgid,
 159                    nst->st_task->comm, nst->st_node,
 160                    nst->st_sc, nst->st_id, nst->st_msg_type,
 161                    nst->st_msg_key,
 162                    (long long)sock,
 163                    (long long)send,
 164                    (long long)status);
 165
 166 out:
 167         spin_unlock(&o2net_debug_lock);
 168
 169         return 0;
 170 }
 171
 172 static void nst_seq_stop(struct seq_file *seq, void *v)
 173 {
 174 }
 175
 176 static const struct seq_operations nst_seq_ops = {
 177         .start = nst_seq_start,
 178         .next = nst_seq_next,
 179         .stop = nst_seq_stop,
 180         .show = nst_seq_show,
 181 };
 182
 183 static int nst_fop_open(struct inode *inode, struct file *file)
 184 {
 185         struct o2net_send_tracking *dummy_nst;
 186         struct seq_file *seq;
 187         int ret;
 188
 189         dummy_nst = kmalloc(sizeof(struct o2net_send_tracking), GFP_KERNEL);
 190         if (dummy_nst == NULL) {
 191                 ret = -ENOMEM;
 192                 goto out;
 193         }
 194         dummy_nst->st_task = NULL;
 195
 196         ret = seq_open(file, &nst_seq_ops);
 197         if (ret)
 198                 goto out;
 199
 200         seq = file->private_data;
 201         seq->private = dummy_nst;
 202         o2net_debug_add_nst(dummy_nst);
 203
 204         dummy_nst = NULL;
 205
 206 out:
 207         kfree(dummy_nst);
 208         return ret;
 209 }
 210
 211 static int nst_fop_release(struct inode *inode, struct file *file)
 212 {
 213         struct seq_file *seq = file->private_data;
 214         struct o2net_send_tracking *dummy_nst = seq->private;
 215
 216         o2net_debug_del_nst(dummy_nst);
 217         return seq_release_private(inode, file);
 218 }
 219
 220 static const struct file_operations nst_seq_fops = {
 221         .open = nst_fop_open,
 222         .read = seq_read,
 223         .llseek = seq_lseek,
 224         .release = nst_fop_release,
 225 };
 226
 227 void o2net_debug_add_sc(struct o2net_sock_container *sc)
 228 {
 229         spin_lock(&o2net_debug_lock);
 230         list_add(&sc->sc_net_debug_item, &sock_containers);
 231         spin_unlock(&o2net_debug_lock);
 232 }
 233
 234 void o2net_debug_del_sc(struct o2net_sock_container *sc)
 235 {
 236         spin_lock(&o2net_debug_lock);
 237         list_del_init(&sc->sc_net_debug_item);
 238         spin_unlock(&o2net_debug_lock);
 239 }
 240
 241 struct o2net_sock_debug {
 242         int dbg_ctxt;
 243         struct o2net_sock_container *dbg_sock;
 244 };
 245
 246 static struct o2net_sock_container
 247                         *next_sc(struct o2net_sock_container *sc_start)
 248 {
 249         struct o2net_sock_container *sc, *ret = NULL;
 250
 251         assert_spin_locked(&o2net_debug_lock);
 252
 253         list_for_each_entry(sc, &sc_start->sc_net_debug_item,
 254                             sc_net_debug_item) {
 255                 /* discover the head of the list miscast as a sc */
 256                 if (&sc->sc_net_debug_item == &sock_containers)
 257                         break;
 258
 259                 /* use sc_page to detect real scs in the list */
 260                 if (sc->sc_page != NULL) {
 261                         ret = sc;
 262                         break;
 263                 }
 264         }
 265
 266         return ret;
 267 }
 268
 269 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
 270 {
 271         struct o2net_sock_debug *sd = seq->private;
 272         struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
 273
 274         spin_lock(&o2net_debug_lock);
 275         sc = next_sc(dummy_sc);
 276         spin_unlock(&o2net_debug_lock);
 277
 278         return sc;
 279 }
 280
 281 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 282 {
 283         struct o2net_sock_debug *sd = seq->private;
 284         struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
 285
 286         spin_lock(&o2net_debug_lock);
 287         sc = next_sc(dummy_sc);
 288         list_del_init(&dummy_sc->sc_net_debug_item);
 289         if (sc)
 290                 list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
 291         spin_unlock(&o2net_debug_lock);
 292
 293         return sc; /* unused, just needs to be null when done */
 294 }
 295
 296 #ifdef CONFIG_OCFS2_FS_STATS
 297 # define sc_send_count(_s)              ((_s)->sc_send_count)
 298 # define sc_recv_count(_s)              ((_s)->sc_recv_count)
 299 # define sc_tv_acquiry_total_ns(_s)     (ktime_to_ns((_s)->sc_tv_acquiry_total))
 300 # define sc_tv_send_total_ns(_s)        (ktime_to_ns((_s)->sc_tv_send_total))
 301 # define sc_tv_status_total_ns(_s)      (ktime_to_ns((_s)->sc_tv_status_total))
 302 # define sc_tv_process_total_ns(_s)     (ktime_to_ns((_s)->sc_tv_process_total))
 303 #else
 304 # define sc_send_count(_s)              (0U)
 305 # define sc_recv_count(_s)              (0U)
 306 # define sc_tv_acquiry_total_ns(_s)     (0LL)
 307 # define sc_tv_send_total_ns(_s)        (0LL)
 308 # define sc_tv_status_total_ns(_s)      (0LL)
 309 # define sc_tv_process_total_ns(_s)     (0LL)
 310 #endif
 311
 312 /* So that debugfs.ocfs2 can determine which format is being used */
 313 #define O2NET_STATS_STR_VERSION         1
 314 static void sc_show_sock_stats(struct seq_file *seq,
 315                                struct o2net_sock_container *sc)
 316 {
 317         if (!sc)
 318                 return;
 319
 320         seq_printf(seq, "%d,%u,%lu,%lld,%lld,%lld,%lu,%lld\n", O2NET_STATS_STR_VERSION,
 321                    sc->sc_node->nd_num, (unsigned long)sc_send_count(sc),
 322                    (long long)sc_tv_acquiry_total_ns(sc),
 323                    (long long)sc_tv_send_total_ns(sc),
 324                    (long long)sc_tv_status_total_ns(sc),
 325                    (unsigned long)sc_recv_count(sc),
 326                    (long long)sc_tv_process_total_ns(sc));
 327 }
 328
 329 static void sc_show_sock_container(struct seq_file *seq,
 330                                    struct o2net_sock_container *sc)
 331 {
 332         struct inet_sock *inet = NULL;
 333         __be32 saddr = 0, daddr = 0;
 334         __be16 sport = 0, dport = 0;
 335
 336         if (!sc)
 337                 return;
 338
 339         if (sc->sc_sock) {
 340                 inet = inet_sk(sc->sc_sock->sk);
 341                 /* the stack's structs aren't sparse endian clean */
 342                 saddr = (__force __be32)inet->inet_saddr;
 343                 daddr = (__force __be32)inet->inet_daddr;
 344                 sport = (__force __be16)inet->inet_sport;
 345                 dport = (__force __be16)inet->inet_dport;
 346         }
 347
 348         /* XXX sigh, inet-> doesn't have sparse annotation so any
 349          * use of it here generates a warning with -Wbitwise */
 350         seq_printf(seq, "%p:\n"
 351                    "  krefs:           %d\n"
 352                    "  sock:            %pI4:%u -> "
 353                                       "%pI4:%u\n"
 354                    "  remote node:     %s\n"
 355                    "  page off:        %zu\n"
 356                    "  handshake ok:    %u\n"
 357                    "  timer:           %lld usecs\n"
 358                    "  data ready:      %lld usecs\n"
 359                    "  advance start:   %lld usecs\n"
 360                    "  advance stop:    %lld usecs\n"
 361                    "  func start:      %lld usecs\n"
 362                    "  func stop:       %lld usecs\n"
 363                    "  func key:        0x%08x\n"
 364                    "  func type:       %u\n",
 365                    sc,
 366                    atomic_read(&sc->sc_kref.refcount),
 367                    &saddr, inet ? ntohs(sport) : 0,
 368                    &daddr, inet ? ntohs(dport) : 0,
 369                    sc->sc_node->nd_name,
 370                    sc->sc_page_off,
 371                    sc->sc_handshake_ok,
 372                    (long long)ktime_to_us(sc->sc_tv_timer),
 373                    (long long)ktime_to_us(sc->sc_tv_data_ready),
 374                    (long long)ktime_to_us(sc->sc_tv_advance_start),
 375                    (long long)ktime_to_us(sc->sc_tv_advance_stop),
 376                    (long long)ktime_to_us(sc->sc_tv_func_start),
 377                    (long long)ktime_to_us(sc->sc_tv_func_stop),
 378                    sc->sc_msg_key,
 379                    sc->sc_msg_type);
 380 }
 381
 382 static int sc_seq_show(struct seq_file *seq, void *v)
 383 {
 384         struct o2net_sock_debug *sd = seq->private;
 385         struct o2net_sock_container *sc, *dummy_sc = sd->dbg_sock;
 386
 387         spin_lock(&o2net_debug_lock);
 388         sc = next_sc(dummy_sc);
 389
 390         if (sc) {
 391                 if (sd->dbg_ctxt == SHOW_SOCK_CONTAINERS)
 392                         sc_show_sock_container(seq, sc);
 393                 else
 394                         sc_show_sock_stats(seq, sc);
 395         }
 396
 397         spin_unlock(&o2net_debug_lock);
 398
 399         return 0;
 400 }
 401
 402 static void sc_seq_stop(struct seq_file *seq, void *v)
 403 {
 404 }
 405
 406 static const struct seq_operations sc_seq_ops = {
 407         .start = sc_seq_start,
 408         .next = sc_seq_next,
 409         .stop = sc_seq_stop,
 410         .show = sc_seq_show,
 411 };
 412
 413 static int sc_common_open(struct file *file, struct o2net_sock_debug *sd)
 414 {
 415         struct o2net_sock_container *dummy_sc;
 416         struct seq_file *seq;
 417         int ret;
 418
 419         dummy_sc = kmalloc(sizeof(struct o2net_sock_container), GFP_KERNEL);
 420         if (dummy_sc == NULL) {
 421                 ret = -ENOMEM;
 422                 goto out;
 423         }
 424         dummy_sc->sc_page = NULL;
 425
 426         ret = seq_open(file, &sc_seq_ops);
 427         if (ret)
 428                 goto out;
 429
 430         seq = file->private_data;
 431         seq->private = sd;
 432         sd->dbg_sock = dummy_sc;
 433         o2net_debug_add_sc(dummy_sc);
 434
 435         dummy_sc = NULL;
 436
 437 out:
 438         kfree(dummy_sc);
 439         return ret;
 440 }
 441
 442 static int sc_fop_release(struct inode *inode, struct file *file)
 443 {
 444         struct seq_file *seq = file->private_data;
 445         struct o2net_sock_debug *sd = seq->private;
 446         struct o2net_sock_container *dummy_sc = sd->dbg_sock;
 447
 448         o2net_debug_del_sc(dummy_sc);
 449         return seq_release_private(inode, file);
 450 }
 451
 452 static int stats_fop_open(struct inode *inode, struct file *file)
 453 {
 454         struct o2net_sock_debug *sd;
 455
 456         sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
 457         if (sd == NULL)
 458                 return -ENOMEM;
 459
 460         sd->dbg_ctxt = SHOW_SOCK_STATS;
 461         sd->dbg_sock = NULL;
 462
 463         return sc_common_open(file, sd);
 464 }
 465
 466 static const struct file_operations stats_seq_fops = {
 467         .open = stats_fop_open,
 468         .read = seq_read,
 469         .llseek = seq_lseek,
 470         .release = sc_fop_release,
 471 };
 472
 473 static int sc_fop_open(struct inode *inode, struct file *file)
 474 {
 475         struct o2net_sock_debug *sd;
 476
 477         sd = kmalloc(sizeof(struct o2net_sock_debug), GFP_KERNEL);
 478         if (sd == NULL)
 479                 return -ENOMEM;
 480
 481         sd->dbg_ctxt = SHOW_SOCK_CONTAINERS;
 482         sd->dbg_sock = NULL;
 483
 484         return sc_common_open(file, sd);
 485 }
 486
 487 static const struct file_operations sc_seq_fops = {
 488         .open = sc_fop_open,
 489         .read = seq_read,
 490         .llseek = seq_lseek,
 491         .release = sc_fop_release,
 492 };
 493
 494 int o2net_debugfs_init(void)
 495 {
 496         o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
 497         if (!o2net_dentry) {
 498                 mlog_errno(-ENOMEM);
 499                 goto bail;
 500         }
 501
 502         nst_dentry = debugfs_create_file(NST_DEBUG_NAME, S_IFREG|S_IRUSR,
 503                                          o2net_dentry, NULL,
 504                                          &nst_seq_fops);
 505         if (!nst_dentry) {
 506                 mlog_errno(-ENOMEM);
 507                 goto bail;
 508         }
 509
 510         sc_dentry = debugfs_create_file(SC_DEBUG_NAME, S_IFREG|S_IRUSR,
 511                                         o2net_dentry, NULL,
 512                                         &sc_seq_fops);
 513         if (!sc_dentry) {
 514                 mlog_errno(-ENOMEM);
 515                 goto bail;
 516         }
 517
 518         stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, S_IFREG|S_IRUSR,
 519                                            o2net_dentry, NULL,
 520                                            &stats_seq_fops);
 521         if (!stats_dentry) {
 522                 mlog_errno(-ENOMEM);
 523                 goto bail;
 524         }
 525
 526         return 0;
 527 bail:
 528         debugfs_remove(stats_dentry);
 529         debugfs_remove(sc_dentry);
 530         debugfs_remove(nst_dentry);
 531         debugfs_remove(o2net_dentry);
 532         return -ENOMEM;
 533 }
 534
 535 void o2net_debugfs_exit(void)
 536 {
 537         debugfs_remove(stats_dentry);
 538         debugfs_remove(sc_dentry);
 539         debugfs_remove(nst_dentry);
 540         debugfs_remove(o2net_dentry);
 541 }
 542
 543 #endif  /* CONFIG_DEBUG_FS */