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   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
  50 static struct dentry *o2net_dentry;
  51 static struct dentry *sc_dentry;
  52 static struct dentry *nst_dentry;
  53
  54 static DEFINE_SPINLOCK(o2net_debug_lock);
  55
  56 static LIST_HEAD(sock_containers);
  57 static LIST_HEAD(send_tracking);
  58
  59 void o2net_debug_add_nst(struct o2net_send_tracking *nst)
  60 {
  61         spin_lock(&o2net_debug_lock);
  62         list_add(&nst->st_net_debug_item, &send_tracking);
  63         spin_unlock(&o2net_debug_lock);
  64 }
  65
  66 void o2net_debug_del_nst(struct o2net_send_tracking *nst)
  67 {
  68         spin_lock(&o2net_debug_lock);
  69         if (!list_empty(&nst->st_net_debug_item))
  70                 list_del_init(&nst->st_net_debug_item);
  71         spin_unlock(&o2net_debug_lock);
  72 }
  73
  74 static struct o2net_send_tracking
  75                         *next_nst(struct o2net_send_tracking *nst_start)
  76 {
  77         struct o2net_send_tracking *nst, *ret = NULL;
  78
  79         assert_spin_locked(&o2net_debug_lock);
  80
  81         list_for_each_entry(nst, &nst_start->st_net_debug_item,
  82                             st_net_debug_item) {
  83                 /* discover the head of the list */
  84                 if (&nst->st_net_debug_item == &send_tracking)
  85                         break;
  86
  87                 /* use st_task to detect real nsts in the list */
  88                 if (nst->st_task != NULL) {
  89                         ret = nst;
  90                         break;
  91                 }
  92         }
  93
  94         return ret;
  95 }
  96
  97 static void *nst_seq_start(struct seq_file *seq, loff_t *pos)
  98 {
  99         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
 100
 101         spin_lock(&o2net_debug_lock);
 102         nst = next_nst(dummy_nst);
 103         spin_unlock(&o2net_debug_lock);
 104
 105         return nst;
 106 }
 107
 108 static void *nst_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 109 {
 110         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
 111
 112         spin_lock(&o2net_debug_lock);
 113         nst = next_nst(dummy_nst);
 114         list_del_init(&dummy_nst->st_net_debug_item);
 115         if (nst)
 116                 list_add(&dummy_nst->st_net_debug_item,
 117                          &nst->st_net_debug_item);
 118         spin_unlock(&o2net_debug_lock);
 119
 120         return nst; /* unused, just needs to be null when done */
 121 }
 122
 123 static int nst_seq_show(struct seq_file *seq, void *v)
 124 {
 125         struct o2net_send_tracking *nst, *dummy_nst = seq->private;
 126
 127         spin_lock(&o2net_debug_lock);
 128         nst = next_nst(dummy_nst);
 129
 130         if (nst != NULL) {
 131                 /* get_task_comm isn't exported.  oh well. */
 132                 seq_printf(seq, "%p:\n"
 133                            "  pid:          %lu\n"
 134                            "  tgid:         %lu\n"
 135                            "  process name: %s\n"
 136                            "  node:         %u\n"
 137                            "  sc:           %p\n"
 138                            "  message id:   %d\n"
 139                            "  message type: %u\n"
 140                            "  message key:  0x%08x\n"
 141                            "  sock acquiry: %lu.%ld\n"
 142                            "  send start:   %lu.%ld\n"
 143                            "  wait start:   %lu.%ld\n",
 144                            nst, (unsigned long)nst->st_task->pid,
 145                            (unsigned long)nst->st_task->tgid,
 146                            nst->st_task->comm, nst->st_node,
 147                            nst->st_sc, nst->st_id, nst->st_msg_type,
 148                            nst->st_msg_key,
 149                            nst->st_sock_time.tv_sec,
 150                            (long)nst->st_sock_time.tv_usec,
 151                            nst->st_send_time.tv_sec,
 152                            (long)nst->st_send_time.tv_usec,
 153                            nst->st_status_time.tv_sec,
 154                            (long)nst->st_status_time.tv_usec);
 155         }
 156
 157         spin_unlock(&o2net_debug_lock);
 158
 159         return 0;
 160 }
 161
 162 static void nst_seq_stop(struct seq_file *seq, void *v)
 163 {
 164 }
 165
 166 static const struct seq_operations nst_seq_ops = {
 167         .start = nst_seq_start,
 168         .next = nst_seq_next,
 169         .stop = nst_seq_stop,
 170         .show = nst_seq_show,
 171 };
 172
 173 static int nst_fop_open(struct inode *inode, struct file *file)
 174 {
 175         struct o2net_send_tracking *dummy_nst;
 176         struct seq_file *seq;
 177         int ret;
 178
 179         dummy_nst = kmalloc(sizeof(struct o2net_send_tracking), GFP_KERNEL);
 180         if (dummy_nst == NULL) {
 181                 ret = -ENOMEM;
 182                 goto out;
 183         }
 184         dummy_nst->st_task = NULL;
 185
 186         ret = seq_open(file, &nst_seq_ops);
 187         if (ret)
 188                 goto out;
 189
 190         seq = file->private_data;
 191         seq->private = dummy_nst;
 192         o2net_debug_add_nst(dummy_nst);
 193
 194         dummy_nst = NULL;
 195
 196 out:
 197         kfree(dummy_nst);
 198         return ret;
 199 }
 200
 201 static int nst_fop_release(struct inode *inode, struct file *file)
 202 {
 203         struct seq_file *seq = file->private_data;
 204         struct o2net_send_tracking *dummy_nst = seq->private;
 205
 206         o2net_debug_del_nst(dummy_nst);
 207         return seq_release_private(inode, file);
 208 }
 209
 210 static const struct file_operations nst_seq_fops = {
 211         .open = nst_fop_open,
 212         .read = seq_read,
 213         .llseek = seq_lseek,
 214         .release = nst_fop_release,
 215 };
 216
 217 void o2net_debug_add_sc(struct o2net_sock_container *sc)
 218 {
 219         spin_lock(&o2net_debug_lock);
 220         list_add(&sc->sc_net_debug_item, &sock_containers);
 221         spin_unlock(&o2net_debug_lock);
 222 }
 223
 224 void o2net_debug_del_sc(struct o2net_sock_container *sc)
 225 {
 226         spin_lock(&o2net_debug_lock);
 227         list_del_init(&sc->sc_net_debug_item);
 228         spin_unlock(&o2net_debug_lock);
 229 }
 230
 231 static struct o2net_sock_container
 232                         *next_sc(struct o2net_sock_container *sc_start)
 233 {
 234         struct o2net_sock_container *sc, *ret = NULL;
 235
 236         assert_spin_locked(&o2net_debug_lock);
 237
 238         list_for_each_entry(sc, &sc_start->sc_net_debug_item,
 239                             sc_net_debug_item) {
 240                 /* discover the head of the list miscast as a sc */
 241                 if (&sc->sc_net_debug_item == &sock_containers)
 242                         break;
 243
 244                 /* use sc_page to detect real scs in the list */
 245                 if (sc->sc_page != NULL) {
 246                         ret = sc;
 247                         break;
 248                 }
 249         }
 250
 251         return ret;
 252 }
 253
 254 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
 255 {
 256         struct o2net_sock_container *sc, *dummy_sc = seq->private;
 257
 258         spin_lock(&o2net_debug_lock);
 259         sc = next_sc(dummy_sc);
 260         spin_unlock(&o2net_debug_lock);
 261
 262         return sc;
 263 }
 264
 265 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 266 {
 267         struct o2net_sock_container *sc, *dummy_sc = seq->private;
 268
 269         spin_lock(&o2net_debug_lock);
 270         sc = next_sc(dummy_sc);
 271         list_del_init(&dummy_sc->sc_net_debug_item);
 272         if (sc)
 273                 list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
 274         spin_unlock(&o2net_debug_lock);
 275
 276         return sc; /* unused, just needs to be null when done */
 277 }
 278
 279 #define TV_SEC_USEC(TV) TV.tv_sec, (long)TV.tv_usec
 280
 281 static int sc_seq_show(struct seq_file *seq, void *v)
 282 {
 283         struct o2net_sock_container *sc, *dummy_sc = seq->private;
 284
 285         spin_lock(&o2net_debug_lock);
 286         sc = next_sc(dummy_sc);
 287
 288         if (sc != NULL) {
 289                 struct inet_sock *inet = NULL;
 290
 291                 __be32 saddr = 0, daddr = 0;
 292                 __be16 sport = 0, dport = 0;
 293
 294                 if (sc->sc_sock) {
 295                         inet = inet_sk(sc->sc_sock->sk);
 296                         /* the stack's structs aren't sparse endian clean */
 297                         saddr = (__force __be32)inet->saddr;
 298                         daddr = (__force __be32)inet->daddr;
 299                         sport = (__force __be16)inet->sport;
 300                         dport = (__force __be16)inet->dport;
 301                 }
 302
 303                 /* XXX sigh, inet-> doesn't have sparse annotation so any
 304                  * use of it here generates a warning with -Wbitwise */
 305                 seq_printf(seq, "%p:\n"
 306                            "  krefs:           %d\n"
 307                            "  sock:            %pI4:%u -> "
 308                                               "%pI4:%u\n"
 309                            "  remote node:     %s\n"
 310                            "  page off:        %zu\n"
 311                            "  handshake ok:    %u\n"
 312                            "  timer:           %lu.%ld\n"
 313                            "  data ready:      %lu.%ld\n"
 314                            "  advance start:   %lu.%ld\n"
 315                            "  advance stop:    %lu.%ld\n"
 316                            "  func start:      %lu.%ld\n"
 317                            "  func stop:       %lu.%ld\n"
 318                            "  func key:        %u\n"
 319                            "  func type:       %u\n",
 320                            sc,
 321                            atomic_read(&sc->sc_kref.refcount),
 322                            &saddr, inet ? ntohs(sport) : 0,
 323                            &daddr, inet ? ntohs(dport) : 0,
 324                            sc->sc_node->nd_name,
 325                            sc->sc_page_off,
 326                            sc->sc_handshake_ok,
 327                            TV_SEC_USEC(sc->sc_tv_timer),
 328                            TV_SEC_USEC(sc->sc_tv_data_ready),
 329                            TV_SEC_USEC(sc->sc_tv_advance_start),
 330                            TV_SEC_USEC(sc->sc_tv_advance_stop),
 331                            TV_SEC_USEC(sc->sc_tv_func_start),
 332                            TV_SEC_USEC(sc->sc_tv_func_stop),
 333                            sc->sc_msg_key,
 334                            sc->sc_msg_type);
 335         }
 336
 337
 338         spin_unlock(&o2net_debug_lock);
 339
 340         return 0;
 341 }
 342
 343 static void sc_seq_stop(struct seq_file *seq, void *v)
 344 {
 345 }
 346
 347 static const struct seq_operations sc_seq_ops = {
 348         .start = sc_seq_start,
 349         .next = sc_seq_next,
 350         .stop = sc_seq_stop,
 351         .show = sc_seq_show,
 352 };
 353
 354 static int sc_fop_open(struct inode *inode, struct file *file)
 355 {
 356         struct o2net_sock_container *dummy_sc;
 357         struct seq_file *seq;
 358         int ret;
 359
 360         dummy_sc = kmalloc(sizeof(struct o2net_sock_container), GFP_KERNEL);
 361         if (dummy_sc == NULL) {
 362                 ret = -ENOMEM;
 363                 goto out;
 364         }
 365         dummy_sc->sc_page = NULL;
 366
 367         ret = seq_open(file, &sc_seq_ops);
 368         if (ret)
 369                 goto out;
 370
 371         seq = file->private_data;
 372         seq->private = dummy_sc;
 373         o2net_debug_add_sc(dummy_sc);
 374
 375         dummy_sc = NULL;
 376
 377 out:
 378         kfree(dummy_sc);
 379         return ret;
 380 }
 381
 382 static int sc_fop_release(struct inode *inode, struct file *file)
 383 {
 384         struct seq_file *seq = file->private_data;
 385         struct o2net_sock_container *dummy_sc = seq->private;
 386
 387         o2net_debug_del_sc(dummy_sc);
 388         return seq_release_private(inode, file);
 389 }
 390
 391 static const struct file_operations sc_seq_fops = {
 392         .open = sc_fop_open,
 393         .read = seq_read,
 394         .llseek = seq_lseek,
 395         .release = sc_fop_release,
 396 };
 397
 398 int o2net_debugfs_init(void)
 399 {
 400         o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
 401         if (!o2net_dentry) {
 402                 mlog_errno(-ENOMEM);
 403                 goto bail;
 404         }
 405
 406         nst_dentry = debugfs_create_file(NST_DEBUG_NAME, S_IFREG|S_IRUSR,
 407                                          o2net_dentry, NULL,
 408                                          &nst_seq_fops);
 409         if (!nst_dentry) {
 410                 mlog_errno(-ENOMEM);
 411                 goto bail;
 412         }
 413
 414         sc_dentry = debugfs_create_file(SC_DEBUG_NAME, S_IFREG|S_IRUSR,
 415                                         o2net_dentry, NULL,
 416                                         &sc_seq_fops);
 417         if (!sc_dentry) {
 418                 mlog_errno(-ENOMEM);
 419                 goto bail;
 420         }
 421
 422         return 0;
 423 bail:
 424         if (sc_dentry)
 425                 debugfs_remove(sc_dentry);
 426         if (nst_dentry)
 427                 debugfs_remove(nst_dentry);
 428         if (o2net_dentry)
 429                 debugfs_remove(o2net_dentry);
 430         return -ENOMEM;
 431 }
 432
 433 void o2net_debugfs_exit(void)
 434 {
 435         if (sc_dentry)
 436                 debugfs_remove(sc_dentry);
 437         if (nst_dentry)
 438                 debugfs_remove(nst_dentry);
 439         if (o2net_dentry)
 440                 debugfs_remove(o2net_dentry);
 441 }
 442
 443 #endif  /* CONFIG_DEBUG_FS */