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 50static struct dentry *o2net_dentry; 51static struct dentry *sc_dentry; 52static struct dentry *nst_dentry; 53 54static DEFINE_SPINLOCK(o2net_debug_lock); 55 56static LIST_HEAD(sock_containers); 57static LIST_HEAD(send_tracking); 58 59void 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 66void 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 74static 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 97static 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 108static 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 123static 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 162static void nst_seq_stop(struct seq_file *seq, void *v) 163{ 164} 165 166static 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 173static 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 196out: 197 kfree(dummy_nst); 198 return ret; 199} 200 201static 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 210static 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 217void 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 224void 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 231static 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 254static 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 265static 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 281static 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->inet_saddr; 298 daddr = (__force __be32)inet->inet_daddr; 299 sport = (__force __be16)inet->inet_sport; 300 dport = (__force __be16)inet->inet_dport; 301 } 302 303 seq_printf(seq, "%p:\n" 304 " krefs: %d\n" 305 " sock: %pI4:%u -> " 306 "%pI4:%u\n" 307 " remote node: %s\n" 308 " page off: %zu\n" 309 " handshake ok: %u\n" 310 " timer: %lu.%ld\n" 311 " data ready: %lu.%ld\n" 312 " advance start: %lu.%ld\n" 313 " advance stop: %lu.%ld\n" 314 " func start: %lu.%ld\n" 315 " func stop: %lu.%ld\n" 316 " func key: %u\n" 317 " func type: %u\n", 318 sc, 319 atomic_read(&sc->sc_kref.refcount), 320 &saddr, inet ? ntohs(sport) : 0, 321 &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 341static void sc_seq_stop(struct seq_file *seq, void *v) 342{ 343} 344 345static const 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 352static 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 375out: 376 kfree(dummy_sc); 377 return ret; 378} 379 380static 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 389static const 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 396int 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; 421bail: 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 431void 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 */ 442