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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.%lu\n"
 142                            "  send start:   %lu.%lu\n"
 143                            "  wait start:   %lu.%lu\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, nst->st_sock_time.tv_usec,
 150                            nst->st_send_time.tv_sec, nst->st_send_time.tv_usec,
 151                            nst->st_status_time.tv_sec,
 152                            nst->st_status_time.tv_usec);
 153         }
 154
 155         spin_unlock(&o2net_debug_lock);
 156
 157         return 0;
 158 }
 159
 160 static void nst_seq_stop(struct seq_file *seq, void *v)
 161 {
 162 }
 163
 164 static struct seq_operations nst_seq_ops = {
 165         .start = nst_seq_start,
 166         .next = nst_seq_next,
 167         .stop = nst_seq_stop,
 168         .show = nst_seq_show,
 169 };
 170
 171 static int nst_fop_open(struct inode *inode, struct file *file)
 172 {
 173         struct o2net_send_tracking *dummy_nst;
 174         struct seq_file *seq;
 175         int ret;
 176
 177         dummy_nst = kmalloc(sizeof(struct o2net_send_tracking), GFP_KERNEL);
 178         if (dummy_nst == NULL) {
 179                 ret = -ENOMEM;
 180                 goto out;
 181         }
 182         dummy_nst->st_task = NULL;
 183
 184         ret = seq_open(file, &nst_seq_ops);
 185         if (ret)
 186                 goto out;
 187
 188         seq = file->private_data;
 189         seq->private = dummy_nst;
 190         o2net_debug_add_nst(dummy_nst);
 191
 192         dummy_nst = NULL;
 193
 194 out:
 195         kfree(dummy_nst);
 196         return ret;
 197 }
 198
 199 static int nst_fop_release(struct inode *inode, struct file *file)
 200 {
 201         struct seq_file *seq = file->private_data;
 202         struct o2net_send_tracking *dummy_nst = seq->private;
 203
 204         o2net_debug_del_nst(dummy_nst);
 205         return seq_release_private(inode, file);
 206 }
 207
 208 static struct file_operations nst_seq_fops = {
 209         .open = nst_fop_open,
 210         .read = seq_read,
 211         .llseek = seq_lseek,
 212         .release = nst_fop_release,
 213 };
 214
 215 void o2net_debug_add_sc(struct o2net_sock_container *sc)
 216 {
 217         spin_lock(&o2net_debug_lock);
 218         list_add(&sc->sc_net_debug_item, &sock_containers);
 219         spin_unlock(&o2net_debug_lock);
 220 }
 221
 222 void o2net_debug_del_sc(struct o2net_sock_container *sc)
 223 {
 224         spin_lock(&o2net_debug_lock);
 225         list_del_init(&sc->sc_net_debug_item);
 226         spin_unlock(&o2net_debug_lock);
 227 }
 228
 229 static struct o2net_sock_container
 230                         *next_sc(struct o2net_sock_container *sc_start)
 231 {
 232         struct o2net_sock_container *sc, *ret = NULL;
 233
 234         assert_spin_locked(&o2net_debug_lock);
 235
 236         list_for_each_entry(sc, &sc_start->sc_net_debug_item,
 237                             sc_net_debug_item) {
 238                 /* discover the head of the list miscast as a sc */
 239                 if (&sc->sc_net_debug_item == &sock_containers)
 240                         break;
 241
 242                 /* use sc_page to detect real scs in the list */
 243                 if (sc->sc_page != NULL) {
 244                         ret = sc;
 245                         break;
 246                 }
 247         }
 248
 249         return ret;
 250 }
 251
 252 static void *sc_seq_start(struct seq_file *seq, loff_t *pos)
 253 {
 254         struct o2net_sock_container *sc, *dummy_sc = seq->private;
 255
 256         spin_lock(&o2net_debug_lock);
 257         sc = next_sc(dummy_sc);
 258         spin_unlock(&o2net_debug_lock);
 259
 260         return sc;
 261 }
 262
 263 static void *sc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 264 {
 265         struct o2net_sock_container *sc, *dummy_sc = seq->private;
 266
 267         spin_lock(&o2net_debug_lock);
 268         sc = next_sc(dummy_sc);
 269         list_del_init(&dummy_sc->sc_net_debug_item);
 270         if (sc)
 271                 list_add(&dummy_sc->sc_net_debug_item, &sc->sc_net_debug_item);
 272         spin_unlock(&o2net_debug_lock);
 273
 274         return sc; /* unused, just needs to be null when done */
 275 }
 276
 277 #define TV_SEC_USEC(TV) TV.tv_sec, TV.tv_usec
 278
 279 static int sc_seq_show(struct seq_file *seq, void *v)
 280 {
 281         struct o2net_sock_container *sc, *dummy_sc = seq->private;
 282
 283         spin_lock(&o2net_debug_lock);
 284         sc = next_sc(dummy_sc);
 285
 286         if (sc != NULL) {
 287                 struct inet_sock *inet = NULL;
 288
 289                 __be32 saddr = 0, daddr = 0;
 290                 __be16 sport = 0, dport = 0;
 291
 292                 if (sc->sc_sock) {
 293                         inet = inet_sk(sc->sc_sock->sk);
 294                         /* the stack's structs aren't sparse endian clean */
 295                         saddr = (__force __be32)inet->saddr;
 296                         daddr = (__force __be32)inet->daddr;
 297                         sport = (__force __be16)inet->sport;
 298                         dport = (__force __be16)inet->dport;
 299                 }
 300
 301                 /* XXX sigh, inet-> doesn't have sparse annotation so any
 302                  * use of it here generates a warning with -Wbitwise */
 303                 seq_printf(seq, "%p:\n"
 304                            "  krefs:           %d\n"
 305                            "  sock:            %u.%u.%u.%u:%u -> "
 306                                               "%u.%u.%u.%u:%u\n"
 307                            "  remote node:     %s\n"
 308                            "  page off:        %zu\n"
 309                            "  handshake ok:    %u\n"
 310                            "  timer:           %lu.%lu\n"
 311                            "  data ready:      %lu.%lu\n"
 312                            "  advance start:   %lu.%lu\n"
 313                            "  advance stop:    %lu.%lu\n"
 314                            "  func start:      %lu.%lu\n"
 315                            "  func stop:       %lu.%lu\n"
 316                            "  func key:        %u\n"
 317                            "  func type:       %u\n",
 318                            sc,
 319                            atomic_read(&sc->sc_kref.refcount),
 320                            NIPQUAD(saddr), inet ? ntohs(sport) : 0,
 321                            NIPQUAD(daddr), inet ? ntohs(dport) : 0,
 322                            sc->sc_node->nd_name,
 323                            sc->sc_page_off,
 324                            sc->sc_handshake_ok,
 325                            TV_SEC_USEC(sc->sc_tv_timer),
 326                            TV_SEC_USEC(sc->sc_tv_data_ready),
 327                            TV_SEC_USEC(sc->sc_tv_advance_start),
 328                            TV_SEC_USEC(sc->sc_tv_advance_stop),
 329                            TV_SEC_USEC(sc->sc_tv_func_start),
 330                            TV_SEC_USEC(sc->sc_tv_func_stop),
 331                            sc->sc_msg_key,
 332                            sc->sc_msg_type);
 333         }
 334
 335
 336         spin_unlock(&o2net_debug_lock);
 337
 338         return 0;
 339 }
 340
 341 static void sc_seq_stop(struct seq_file *seq, void *v)
 342 {
 343 }
 344
 345 static struct seq_operations sc_seq_ops = {
 346         .start = sc_seq_start,
 347         .next = sc_seq_next,
 348         .stop = sc_seq_stop,
 349         .show = sc_seq_show,
 350 };
 351
 352 static int sc_fop_open(struct inode *inode, struct file *file)
 353 {
 354         struct o2net_sock_container *dummy_sc;
 355         struct seq_file *seq;
 356         int ret;
 357
 358         dummy_sc = kmalloc(sizeof(struct o2net_sock_container), GFP_KERNEL);
 359         if (dummy_sc == NULL) {
 360                 ret = -ENOMEM;
 361                 goto out;
 362         }
 363         dummy_sc->sc_page = NULL;
 364
 365         ret = seq_open(file, &sc_seq_ops);
 366         if (ret)
 367                 goto out;
 368
 369         seq = file->private_data;
 370         seq->private = dummy_sc;
 371         o2net_debug_add_sc(dummy_sc);
 372
 373         dummy_sc = NULL;
 374
 375 out:
 376         kfree(dummy_sc);
 377         return ret;
 378 }
 379
 380 static int sc_fop_release(struct inode *inode, struct file *file)
 381 {
 382         struct seq_file *seq = file->private_data;
 383         struct o2net_sock_container *dummy_sc = seq->private;
 384
 385         o2net_debug_del_sc(dummy_sc);
 386         return seq_release_private(inode, file);
 387 }
 388
 389 static struct file_operations sc_seq_fops = {
 390         .open = sc_fop_open,
 391         .read = seq_read,
 392         .llseek = seq_lseek,
 393         .release = sc_fop_release,
 394 };
 395
 396 int o2net_debugfs_init(void)
 397 {
 398         o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
 399         if (!o2net_dentry) {
 400                 mlog_errno(-ENOMEM);
 401                 goto bail;
 402         }
 403
 404         nst_dentry = debugfs_create_file(NST_DEBUG_NAME, S_IFREG|S_IRUSR,
 405                                          o2net_dentry, NULL,
 406                                          &nst_seq_fops);
 407         if (!nst_dentry) {
 408                 mlog_errno(-ENOMEM);
 409                 goto bail;
 410         }
 411
 412         sc_dentry = debugfs_create_file(SC_DEBUG_NAME, S_IFREG|S_IRUSR,
 413                                         o2net_dentry, NULL,
 414                                         &sc_seq_fops);
 415         if (!sc_dentry) {
 416                 mlog_errno(-ENOMEM);
 417                 goto bail;
 418         }
 419
 420         return 0;
 421 bail:
 422         if (sc_dentry)
 423                 debugfs_remove(sc_dentry);
 424         if (nst_dentry)
 425                 debugfs_remove(nst_dentry);
 426         if (o2net_dentry)
 427                 debugfs_remove(o2net_dentry);
 428         return -ENOMEM;
 429 }
 430
 431 void o2net_debugfs_exit(void)
 432 {
 433         if (sc_dentry)
 434                 debugfs_remove(sc_dentry);
 435         if (nst_dentry)
 436                 debugfs_remove(nst_dentry);
 437         if (o2net_dentry)
 438                 debugfs_remove(o2net_dentry);
 439 }
 440
 441 #endif  /* CONFIG_DEBUG_FS */