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Linux/fs/ocfs2/cluster/netdebug.c

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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 #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 */
544 

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