1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * 3 * vim: noexpandtab sw=8 ts=8 sts=0: 4 * 5 * Copyright (C) 2004 Oracle. All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public 18 * License along with this program; if not, write to the 19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 20 * Boston, MA 021110-1307, USA. 21 * 22 * ---- 23 * 24 * Callers for this were originally written against a very simple synchronus 25 * API. This implementation reflects those simple callers. Some day I'm sure 26 * we'll need to move to a more robust posting/callback mechanism. 27 * 28 * Transmit calls pass in kernel virtual addresses and block copying this into 29 * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting 30 * for a failed socket to timeout. TX callers can also pass in a poniter to an 31 * 'int' which gets filled with an errno off the wire in response to the 32 * message they send. 33 * 34 * Handlers for unsolicited messages are registered. Each socket has a page 35 * that incoming data is copied into. First the header, then the data. 36 * Handlers are called from only one thread with a reference to this per-socket 37 * page. This page is destroyed after the handler call, so it can't be 38 * referenced beyond the call. Handlers may block but are discouraged from 39 * doing so. 40 * 41 * Any framing errors (bad magic, large payload lengths) close a connection. 42 * 43 * Our sock_container holds the state we associate with a socket. It's current 44 * framing state is held there as well as the refcounting we do around when it 45 * is safe to tear down the socket. The socket is only finally torn down from 46 * the container when the container loses all of its references -- so as long 47 * as you hold a ref on the container you can trust that the socket is valid 48 * for use with kernel socket APIs. 49 * 50 * Connections are initiated between a pair of nodes when the node with the 51 * higher node number gets a heartbeat callback which indicates that the lower 52 * numbered node has started heartbeating. The lower numbered node is passive 53 * and only accepts the connection if the higher numbered node is heartbeating. 54 */ 55 56 #include <linux/kernel.h> 57 #include <linux/jiffies.h> 58 #include <linux/slab.h> 59 #include <linux/idr.h> 60 #include <linux/kref.h> 61 #include <net/tcp.h> 62 63 #include <asm/uaccess.h> 64 65 #include "heartbeat.h" 66 #include "tcp.h" 67 #include "nodemanager.h" 68 #define MLOG_MASK_PREFIX ML_TCP 69 #include "masklog.h" 70 #include "quorum.h" 71 72 #include "tcp_internal.h" 73 74 /* 75 * The linux network stack isn't sparse endian clean.. It has macros like 76 * ntohs() which perform the endian checks and structs like sockaddr_in 77 * which aren't annotated. So __force is found here to get the build 78 * clean. When they emerge from the dark ages and annotate the code 79 * we can remove these. 80 */ 81 82 #define SC_NODEF_FMT "node %s (num %u) at %u.%u.%u.%u:%u" 83 #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ 84 NIPQUAD(sc->sc_node->nd_ipv4_address), \ 85 ntohs(sc->sc_node->nd_ipv4_port) 86 87 /* 88 * In the following two log macros, the whitespace after the ',' just 89 * before ##args is intentional. Otherwise, gcc 2.95 will eat the 90 * previous token if args expands to nothing. 91 */ 92 #define msglog(hdr, fmt, args...) do { \ 93 typeof(hdr) __hdr = (hdr); \ 94 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ 95 "key %08x num %u] " fmt, \ 96 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ 97 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ 98 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ 99 be32_to_cpu(__hdr->msg_num) , ##args); \ 100 } while (0) 101 102 #define sclog(sc, fmt, args...) do { \ 103 typeof(sc) __sc = (sc); \ 104 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ 105 "pg_off %zu] " fmt, __sc, \ 106 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ 107 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ 108 ##args); \ 109 } while (0) 110 111 static DEFINE_RWLOCK(o2net_handler_lock); 112 static struct rb_root o2net_handler_tree = RB_ROOT; 113 114 static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; 115 116 /* XXX someday we'll need better accounting */ 117 static struct socket *o2net_listen_sock = NULL; 118 119 /* 120 * listen work is only queued by the listening socket callbacks on the 121 * o2net_wq. teardown detaches the callbacks before destroying the workqueue. 122 * quorum work is queued as sock containers are shutdown.. stop_listening 123 * tears down all the node's sock containers, preventing future shutdowns 124 * and queued quroum work, before canceling delayed quorum work and 125 * destroying the work queue. 126 */ 127 static struct workqueue_struct *o2net_wq; 128 static struct work_struct o2net_listen_work; 129 130 static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; 131 #define O2NET_HB_PRI 0x1 132 133 static struct o2net_handshake *o2net_hand; 134 static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; 135 136 static int o2net_sys_err_translations[O2NET_ERR_MAX] = 137 {[O2NET_ERR_NONE] = 0, 138 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, 139 [O2NET_ERR_OVERFLOW] = -EOVERFLOW, 140 [O2NET_ERR_DIED] = -EHOSTDOWN,}; 141 142 /* can't quite avoid *all* internal declarations :/ */ 143 static void o2net_sc_connect_completed(struct work_struct *work); 144 static void o2net_rx_until_empty(struct work_struct *work); 145 static void o2net_shutdown_sc(struct work_struct *work); 146 static void o2net_listen_data_ready(struct sock *sk, int bytes); 147 static void o2net_sc_send_keep_req(struct work_struct *work); 148 static void o2net_idle_timer(unsigned long data); 149 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); 150 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); 151 152 /* 153 * FIXME: These should use to_o2nm_cluster_from_node(), but we end up 154 * losing our parent link to the cluster during shutdown. This can be 155 * solved by adding a pre-removal callback to configfs, or passing 156 * around the cluster with the node. -jeffm 157 */ 158 static inline int o2net_reconnect_delay(struct o2nm_node *node) 159 { 160 return o2nm_single_cluster->cl_reconnect_delay_ms; 161 } 162 163 static inline int o2net_keepalive_delay(struct o2nm_node *node) 164 { 165 return o2nm_single_cluster->cl_keepalive_delay_ms; 166 } 167 168 static inline int o2net_idle_timeout(struct o2nm_node *node) 169 { 170 return o2nm_single_cluster->cl_idle_timeout_ms; 171 } 172 173 static inline int o2net_sys_err_to_errno(enum o2net_system_error err) 174 { 175 int trans; 176 BUG_ON(err >= O2NET_ERR_MAX); 177 trans = o2net_sys_err_translations[err]; 178 179 /* Just in case we mess up the translation table above */ 180 BUG_ON(err != O2NET_ERR_NONE && trans == 0); 181 return trans; 182 } 183 184 static struct o2net_node * o2net_nn_from_num(u8 node_num) 185 { 186 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); 187 return &o2net_nodes[node_num]; 188 } 189 190 static u8 o2net_num_from_nn(struct o2net_node *nn) 191 { 192 BUG_ON(nn == NULL); 193 return nn - o2net_nodes; 194 } 195 196 /* ------------------------------------------------------------ */ 197 198 static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) 199 { 200 int ret = 0; 201 202 do { 203 if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { 204 ret = -EAGAIN; 205 break; 206 } 207 spin_lock(&nn->nn_lock); 208 ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); 209 if (ret == 0) 210 list_add_tail(&nsw->ns_node_item, 211 &nn->nn_status_list); 212 spin_unlock(&nn->nn_lock); 213 } while (ret == -EAGAIN); 214 215 if (ret == 0) { 216 init_waitqueue_head(&nsw->ns_wq); 217 nsw->ns_sys_status = O2NET_ERR_NONE; 218 nsw->ns_status = 0; 219 } 220 221 return ret; 222 } 223 224 static void o2net_complete_nsw_locked(struct o2net_node *nn, 225 struct o2net_status_wait *nsw, 226 enum o2net_system_error sys_status, 227 s32 status) 228 { 229 assert_spin_locked(&nn->nn_lock); 230 231 if (!list_empty(&nsw->ns_node_item)) { 232 list_del_init(&nsw->ns_node_item); 233 nsw->ns_sys_status = sys_status; 234 nsw->ns_status = status; 235 idr_remove(&nn->nn_status_idr, nsw->ns_id); 236 wake_up(&nsw->ns_wq); 237 } 238 } 239 240 static void o2net_complete_nsw(struct o2net_node *nn, 241 struct o2net_status_wait *nsw, 242 u64 id, enum o2net_system_error sys_status, 243 s32 status) 244 { 245 spin_lock(&nn->nn_lock); 246 if (nsw == NULL) { 247 if (id > INT_MAX) 248 goto out; 249 250 nsw = idr_find(&nn->nn_status_idr, id); 251 if (nsw == NULL) 252 goto out; 253 } 254 255 o2net_complete_nsw_locked(nn, nsw, sys_status, status); 256 257 out: 258 spin_unlock(&nn->nn_lock); 259 return; 260 } 261 262 static void o2net_complete_nodes_nsw(struct o2net_node *nn) 263 { 264 struct list_head *iter, *tmp; 265 unsigned int num_kills = 0; 266 struct o2net_status_wait *nsw; 267 268 assert_spin_locked(&nn->nn_lock); 269 270 list_for_each_safe(iter, tmp, &nn->nn_status_list) { 271 nsw = list_entry(iter, struct o2net_status_wait, ns_node_item); 272 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); 273 num_kills++; 274 } 275 276 mlog(0, "completed %d messages for node %u\n", num_kills, 277 o2net_num_from_nn(nn)); 278 } 279 280 static int o2net_nsw_completed(struct o2net_node *nn, 281 struct o2net_status_wait *nsw) 282 { 283 int completed; 284 spin_lock(&nn->nn_lock); 285 completed = list_empty(&nsw->ns_node_item); 286 spin_unlock(&nn->nn_lock); 287 return completed; 288 } 289 290 /* ------------------------------------------------------------ */ 291 292 static void sc_kref_release(struct kref *kref) 293 { 294 struct o2net_sock_container *sc = container_of(kref, 295 struct o2net_sock_container, sc_kref); 296 BUG_ON(timer_pending(&sc->sc_idle_timeout)); 297 298 sclog(sc, "releasing\n"); 299 300 if (sc->sc_sock) { 301 sock_release(sc->sc_sock); 302 sc->sc_sock = NULL; 303 } 304 305 o2nm_node_put(sc->sc_node); 306 sc->sc_node = NULL; 307 308 kfree(sc); 309 } 310 311 static void sc_put(struct o2net_sock_container *sc) 312 { 313 sclog(sc, "put\n"); 314 kref_put(&sc->sc_kref, sc_kref_release); 315 } 316 static void sc_get(struct o2net_sock_container *sc) 317 { 318 sclog(sc, "get\n"); 319 kref_get(&sc->sc_kref); 320 } 321 static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) 322 { 323 struct o2net_sock_container *sc, *ret = NULL; 324 struct page *page = NULL; 325 326 page = alloc_page(GFP_NOFS); 327 sc = kzalloc(sizeof(*sc), GFP_NOFS); 328 if (sc == NULL || page == NULL) 329 goto out; 330 331 kref_init(&sc->sc_kref); 332 o2nm_node_get(node); 333 sc->sc_node = node; 334 335 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); 336 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); 337 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); 338 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); 339 340 init_timer(&sc->sc_idle_timeout); 341 sc->sc_idle_timeout.function = o2net_idle_timer; 342 sc->sc_idle_timeout.data = (unsigned long)sc; 343 344 sclog(sc, "alloced\n"); 345 346 ret = sc; 347 sc->sc_page = page; 348 sc = NULL; 349 page = NULL; 350 351 out: 352 if (page) 353 __free_page(page); 354 kfree(sc); 355 356 return ret; 357 } 358 359 /* ------------------------------------------------------------ */ 360 361 static void o2net_sc_queue_work(struct o2net_sock_container *sc, 362 struct work_struct *work) 363 { 364 sc_get(sc); 365 if (!queue_work(o2net_wq, work)) 366 sc_put(sc); 367 } 368 static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, 369 struct delayed_work *work, 370 int delay) 371 { 372 sc_get(sc); 373 if (!queue_delayed_work(o2net_wq, work, delay)) 374 sc_put(sc); 375 } 376 static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, 377 struct delayed_work *work) 378 { 379 if (cancel_delayed_work(work)) 380 sc_put(sc); 381 } 382 383 static atomic_t o2net_connected_peers = ATOMIC_INIT(0); 384 385 int o2net_num_connected_peers(void) 386 { 387 return atomic_read(&o2net_connected_peers); 388 } 389 390 static void o2net_set_nn_state(struct o2net_node *nn, 391 struct o2net_sock_container *sc, 392 unsigned valid, int err) 393 { 394 int was_valid = nn->nn_sc_valid; 395 int was_err = nn->nn_persistent_error; 396 struct o2net_sock_container *old_sc = nn->nn_sc; 397 398 assert_spin_locked(&nn->nn_lock); 399 400 if (old_sc && !sc) 401 atomic_dec(&o2net_connected_peers); 402 else if (!old_sc && sc) 403 atomic_inc(&o2net_connected_peers); 404 405 /* the node num comparison and single connect/accept path should stop 406 * an non-null sc from being overwritten with another */ 407 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); 408 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); 409 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); 410 411 /* we won't reconnect after our valid conn goes away for 412 * this hb iteration.. here so it shows up in the logs */ 413 if (was_valid && !valid && err == 0) 414 err = -ENOTCONN; 415 416 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", 417 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, 418 nn->nn_persistent_error, err); 419 420 nn->nn_sc = sc; 421 nn->nn_sc_valid = valid ? 1 : 0; 422 nn->nn_persistent_error = err; 423 424 /* mirrors o2net_tx_can_proceed() */ 425 if (nn->nn_persistent_error || nn->nn_sc_valid) 426 wake_up(&nn->nn_sc_wq); 427 428 if (!was_err && nn->nn_persistent_error) { 429 o2quo_conn_err(o2net_num_from_nn(nn)); 430 queue_delayed_work(o2net_wq, &nn->nn_still_up, 431 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); 432 } 433 434 if (was_valid && !valid) { 435 printk(KERN_INFO "o2net: no longer connected to " 436 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); 437 o2net_complete_nodes_nsw(nn); 438 } 439 440 if (!was_valid && valid) { 441 o2quo_conn_up(o2net_num_from_nn(nn)); 442 /* this is a bit of a hack. we only try reconnecting 443 * when heartbeating starts until we get a connection. 444 * if that connection then dies we don't try reconnecting. 445 * the only way to start connecting again is to down 446 * heartbeat and bring it back up. */ 447 cancel_delayed_work(&nn->nn_connect_expired); 448 printk(KERN_INFO "o2net: %s " SC_NODEF_FMT "\n", 449 o2nm_this_node() > sc->sc_node->nd_num ? 450 "connected to" : "accepted connection from", 451 SC_NODEF_ARGS(sc)); 452 } 453 454 /* trigger the connecting worker func as long as we're not valid, 455 * it will back off if it shouldn't connect. This can be called 456 * from node config teardown and so needs to be careful about 457 * the work queue actually being up. */ 458 if (!valid && o2net_wq) { 459 unsigned long delay; 460 /* delay if we're withing a RECONNECT_DELAY of the 461 * last attempt */ 462 delay = (nn->nn_last_connect_attempt + 463 msecs_to_jiffies(o2net_reconnect_delay(sc->sc_node))) 464 - jiffies; 465 if (delay > msecs_to_jiffies(o2net_reconnect_delay(sc->sc_node))) 466 delay = 0; 467 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); 468 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); 469 } 470 471 /* keep track of the nn's sc ref for the caller */ 472 if ((old_sc == NULL) && sc) 473 sc_get(sc); 474 if (old_sc && (old_sc != sc)) { 475 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); 476 sc_put(old_sc); 477 } 478 } 479 480 /* see o2net_register_callbacks() */ 481 static void o2net_data_ready(struct sock *sk, int bytes) 482 { 483 void (*ready)(struct sock *sk, int bytes); 484 485 read_lock(&sk->sk_callback_lock); 486 if (sk->sk_user_data) { 487 struct o2net_sock_container *sc = sk->sk_user_data; 488 sclog(sc, "data_ready hit\n"); 489 do_gettimeofday(&sc->sc_tv_data_ready); 490 o2net_sc_queue_work(sc, &sc->sc_rx_work); 491 ready = sc->sc_data_ready; 492 } else { 493 ready = sk->sk_data_ready; 494 } 495 read_unlock(&sk->sk_callback_lock); 496 497 ready(sk, bytes); 498 } 499 500 /* see o2net_register_callbacks() */ 501 static void o2net_state_change(struct sock *sk) 502 { 503 void (*state_change)(struct sock *sk); 504 struct o2net_sock_container *sc; 505 506 read_lock(&sk->sk_callback_lock); 507 sc = sk->sk_user_data; 508 if (sc == NULL) { 509 state_change = sk->sk_state_change; 510 goto out; 511 } 512 513 sclog(sc, "state_change to %d\n", sk->sk_state); 514 515 state_change = sc->sc_state_change; 516 517 switch(sk->sk_state) { 518 /* ignore connecting sockets as they make progress */ 519 case TCP_SYN_SENT: 520 case TCP_SYN_RECV: 521 break; 522 case TCP_ESTABLISHED: 523 o2net_sc_queue_work(sc, &sc->sc_connect_work); 524 break; 525 default: 526 o2net_sc_queue_work(sc, &sc->sc_shutdown_work); 527 break; 528 } 529 out: 530 read_unlock(&sk->sk_callback_lock); 531 state_change(sk); 532 } 533 534 /* 535 * we register callbacks so we can queue work on events before calling 536 * the original callbacks. our callbacks our careful to test user_data 537 * to discover when they've reaced with o2net_unregister_callbacks(). 538 */ 539 static void o2net_register_callbacks(struct sock *sk, 540 struct o2net_sock_container *sc) 541 { 542 write_lock_bh(&sk->sk_callback_lock); 543 544 /* accepted sockets inherit the old listen socket data ready */ 545 if (sk->sk_data_ready == o2net_listen_data_ready) { 546 sk->sk_data_ready = sk->sk_user_data; 547 sk->sk_user_data = NULL; 548 } 549 550 BUG_ON(sk->sk_user_data != NULL); 551 sk->sk_user_data = sc; 552 sc_get(sc); 553 554 sc->sc_data_ready = sk->sk_data_ready; 555 sc->sc_state_change = sk->sk_state_change; 556 sk->sk_data_ready = o2net_data_ready; 557 sk->sk_state_change = o2net_state_change; 558 559 mutex_init(&sc->sc_send_lock); 560 561 write_unlock_bh(&sk->sk_callback_lock); 562 } 563 564 static int o2net_unregister_callbacks(struct sock *sk, 565 struct o2net_sock_container *sc) 566 { 567 int ret = 0; 568 569 write_lock_bh(&sk->sk_callback_lock); 570 if (sk->sk_user_data == sc) { 571 ret = 1; 572 sk->sk_user_data = NULL; 573 sk->sk_data_ready = sc->sc_data_ready; 574 sk->sk_state_change = sc->sc_state_change; 575 } 576 write_unlock_bh(&sk->sk_callback_lock); 577 578 return ret; 579 } 580 581 /* 582 * this is a little helper that is called by callers who have seen a problem 583 * with an sc and want to detach it from the nn if someone already hasn't beat 584 * them to it. if an error is given then the shutdown will be persistent 585 * and pending transmits will be canceled. 586 */ 587 static void o2net_ensure_shutdown(struct o2net_node *nn, 588 struct o2net_sock_container *sc, 589 int err) 590 { 591 spin_lock(&nn->nn_lock); 592 if (nn->nn_sc == sc) 593 o2net_set_nn_state(nn, NULL, 0, err); 594 spin_unlock(&nn->nn_lock); 595 } 596 597 /* 598 * This work queue function performs the blocking parts of socket shutdown. A 599 * few paths lead here. set_nn_state will trigger this callback if it sees an 600 * sc detached from the nn. state_change will also trigger this callback 601 * directly when it sees errors. In that case we need to call set_nn_state 602 * ourselves as state_change couldn't get the nn_lock and call set_nn_state 603 * itself. 604 */ 605 static void o2net_shutdown_sc(struct work_struct *work) 606 { 607 struct o2net_sock_container *sc = 608 container_of(work, struct o2net_sock_container, 609 sc_shutdown_work); 610 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); 611 612 sclog(sc, "shutting down\n"); 613 614 /* drop the callbacks ref and call shutdown only once */ 615 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { 616 /* we shouldn't flush as we're in the thread, the 617 * races with pending sc work structs are harmless */ 618 del_timer_sync(&sc->sc_idle_timeout); 619 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); 620 sc_put(sc); 621 sc->sc_sock->ops->shutdown(sc->sc_sock, 622 RCV_SHUTDOWN|SEND_SHUTDOWN); 623 } 624 625 /* not fatal so failed connects before the other guy has our 626 * heartbeat can be retried */ 627 o2net_ensure_shutdown(nn, sc, 0); 628 sc_put(sc); 629 } 630 631 /* ------------------------------------------------------------ */ 632 633 static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, 634 u32 key) 635 { 636 int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); 637 638 if (ret == 0) 639 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); 640 641 return ret; 642 } 643 644 static struct o2net_msg_handler * 645 o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, 646 struct rb_node **ret_parent) 647 { 648 struct rb_node **p = &o2net_handler_tree.rb_node; 649 struct rb_node *parent = NULL; 650 struct o2net_msg_handler *nmh, *ret = NULL; 651 int cmp; 652 653 while (*p) { 654 parent = *p; 655 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); 656 cmp = o2net_handler_cmp(nmh, msg_type, key); 657 658 if (cmp < 0) 659 p = &(*p)->rb_left; 660 else if (cmp > 0) 661 p = &(*p)->rb_right; 662 else { 663 ret = nmh; 664 break; 665 } 666 } 667 668 if (ret_p != NULL) 669 *ret_p = p; 670 if (ret_parent != NULL) 671 *ret_parent = parent; 672 673 return ret; 674 } 675 676 static void o2net_handler_kref_release(struct kref *kref) 677 { 678 struct o2net_msg_handler *nmh; 679 nmh = container_of(kref, struct o2net_msg_handler, nh_kref); 680 681 kfree(nmh); 682 } 683 684 static void o2net_handler_put(struct o2net_msg_handler *nmh) 685 { 686 kref_put(&nmh->nh_kref, o2net_handler_kref_release); 687 } 688 689 /* max_len is protection for the handler func. incoming messages won't 690 * be given to the handler if their payload is longer than the max. */ 691 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, 692 o2net_msg_handler_func *func, void *data, 693 o2net_post_msg_handler_func *post_func, 694 struct list_head *unreg_list) 695 { 696 struct o2net_msg_handler *nmh = NULL; 697 struct rb_node **p, *parent; 698 int ret = 0; 699 700 if (max_len > O2NET_MAX_PAYLOAD_BYTES) { 701 mlog(0, "max_len for message handler out of range: %u\n", 702 max_len); 703 ret = -EINVAL; 704 goto out; 705 } 706 707 if (!msg_type) { 708 mlog(0, "no message type provided: %u, %p\n", msg_type, func); 709 ret = -EINVAL; 710 goto out; 711 712 } 713 if (!func) { 714 mlog(0, "no message handler provided: %u, %p\n", 715 msg_type, func); 716 ret = -EINVAL; 717 goto out; 718 } 719 720 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); 721 if (nmh == NULL) { 722 ret = -ENOMEM; 723 goto out; 724 } 725 726 nmh->nh_func = func; 727 nmh->nh_func_data = data; 728 nmh->nh_post_func = post_func; 729 nmh->nh_msg_type = msg_type; 730 nmh->nh_max_len = max_len; 731 nmh->nh_key = key; 732 /* the tree and list get this ref.. they're both removed in 733 * unregister when this ref is dropped */ 734 kref_init(&nmh->nh_kref); 735 INIT_LIST_HEAD(&nmh->nh_unregister_item); 736 737 write_lock(&o2net_handler_lock); 738 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) 739 ret = -EEXIST; 740 else { 741 rb_link_node(&nmh->nh_node, parent, p); 742 rb_insert_color(&nmh->nh_node, &o2net_handler_tree); 743 list_add_tail(&nmh->nh_unregister_item, unreg_list); 744 745 mlog(ML_TCP, "registered handler func %p type %u key %08x\n", 746 func, msg_type, key); 747 /* we've had some trouble with handlers seemingly vanishing. */ 748 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, 749 &parent) == NULL, 750 "couldn't find handler we *just* registerd " 751 "for type %u key %08x\n", msg_type, key); 752 } 753 write_unlock(&o2net_handler_lock); 754 if (ret) 755 goto out; 756 757 out: 758 if (ret) 759 kfree(nmh); 760 761 return ret; 762 } 763 EXPORT_SYMBOL_GPL(o2net_register_handler); 764 765 void o2net_unregister_handler_list(struct list_head *list) 766 { 767 struct list_head *pos, *n; 768 struct o2net_msg_handler *nmh; 769 770 write_lock(&o2net_handler_lock); 771 list_for_each_safe(pos, n, list) { 772 nmh = list_entry(pos, struct o2net_msg_handler, 773 nh_unregister_item); 774 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", 775 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); 776 rb_erase(&nmh->nh_node, &o2net_handler_tree); 777 list_del_init(&nmh->nh_unregister_item); 778 kref_put(&nmh->nh_kref, o2net_handler_kref_release); 779 } 780 write_unlock(&o2net_handler_lock); 781 } 782 EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); 783 784 static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) 785 { 786 struct o2net_msg_handler *nmh; 787 788 read_lock(&o2net_handler_lock); 789 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); 790 if (nmh) 791 kref_get(&nmh->nh_kref); 792 read_unlock(&o2net_handler_lock); 793 794 return nmh; 795 } 796 797 /* ------------------------------------------------------------ */ 798 799 static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) 800 { 801 int ret; 802 mm_segment_t oldfs; 803 struct kvec vec = { 804 .iov_len = len, 805 .iov_base = data, 806 }; 807 struct msghdr msg = { 808 .msg_iovlen = 1, 809 .msg_iov = (struct iovec *)&vec, 810 .msg_flags = MSG_DONTWAIT, 811 }; 812 813 oldfs = get_fs(); 814 set_fs(get_ds()); 815 ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); 816 set_fs(oldfs); 817 818 return ret; 819 } 820 821 static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, 822 size_t veclen, size_t total) 823 { 824 int ret; 825 mm_segment_t oldfs; 826 struct msghdr msg = { 827 .msg_iov = (struct iovec *)vec, 828 .msg_iovlen = veclen, 829 }; 830 831 if (sock == NULL) { 832 ret = -EINVAL; 833 goto out; 834 } 835 836 oldfs = get_fs(); 837 set_fs(get_ds()); 838 ret = sock_sendmsg(sock, &msg, total); 839 set_fs(oldfs); 840 if (ret != total) { 841 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, 842 total); 843 if (ret >= 0) 844 ret = -EPIPE; /* should be smarter, I bet */ 845 goto out; 846 } 847 848 ret = 0; 849 out: 850 if (ret < 0) 851 mlog(0, "returning error: %d\n", ret); 852 return ret; 853 } 854 855 static void o2net_sendpage(struct o2net_sock_container *sc, 856 void *kmalloced_virt, 857 size_t size) 858 { 859 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); 860 ssize_t ret; 861 862 863 mutex_lock(&sc->sc_send_lock); 864 ret = sc->sc_sock->ops->sendpage(sc->sc_sock, 865 virt_to_page(kmalloced_virt), 866 (long)kmalloced_virt & ~PAGE_MASK, 867 size, MSG_DONTWAIT); 868 mutex_unlock(&sc->sc_send_lock); 869 if (ret != size) { 870 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT 871 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); 872 o2net_ensure_shutdown(nn, sc, 0); 873 } 874 } 875 876 static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) 877 { 878 memset(msg, 0, sizeof(struct o2net_msg)); 879 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); 880 msg->data_len = cpu_to_be16(data_len); 881 msg->msg_type = cpu_to_be16(msg_type); 882 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); 883 msg->status = 0; 884 msg->key = cpu_to_be32(key); 885 } 886 887 static int o2net_tx_can_proceed(struct o2net_node *nn, 888 struct o2net_sock_container **sc_ret, 889 int *error) 890 { 891 int ret = 0; 892 893 spin_lock(&nn->nn_lock); 894 if (nn->nn_persistent_error) { 895 ret = 1; 896 *sc_ret = NULL; 897 *error = nn->nn_persistent_error; 898 } else if (nn->nn_sc_valid) { 899 kref_get(&nn->nn_sc->sc_kref); 900 901 ret = 1; 902 *sc_ret = nn->nn_sc; 903 *error = 0; 904 } 905 spin_unlock(&nn->nn_lock); 906 907 return ret; 908 } 909 910 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, 911 size_t caller_veclen, u8 target_node, int *status) 912 { 913 int ret, error = 0; 914 struct o2net_msg *msg = NULL; 915 size_t veclen, caller_bytes = 0; 916 struct kvec *vec = NULL; 917 struct o2net_sock_container *sc = NULL; 918 struct o2net_node *nn = o2net_nn_from_num(target_node); 919 struct o2net_status_wait nsw = { 920 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), 921 }; 922 923 if (o2net_wq == NULL) { 924 mlog(0, "attempt to tx without o2netd running\n"); 925 ret = -ESRCH; 926 goto out; 927 } 928 929 if (caller_veclen == 0) { 930 mlog(0, "bad kvec array length\n"); 931 ret = -EINVAL; 932 goto out; 933 } 934 935 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); 936 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { 937 mlog(0, "total payload len %zu too large\n", caller_bytes); 938 ret = -EINVAL; 939 goto out; 940 } 941 942 if (target_node == o2nm_this_node()) { 943 ret = -ELOOP; 944 goto out; 945 } 946 947 ret = wait_event_interruptible(nn->nn_sc_wq, 948 o2net_tx_can_proceed(nn, &sc, &error)); 949 if (!ret && error) 950 ret = error; 951 if (ret) 952 goto out; 953 954 veclen = caller_veclen + 1; 955 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); 956 if (vec == NULL) { 957 mlog(0, "failed to %zu element kvec!\n", veclen); 958 ret = -ENOMEM; 959 goto out; 960 } 961 962 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); 963 if (!msg) { 964 mlog(0, "failed to allocate a o2net_msg!\n"); 965 ret = -ENOMEM; 966 goto out; 967 } 968 969 o2net_init_msg(msg, caller_bytes, msg_type, key); 970 971 vec[0].iov_len = sizeof(struct o2net_msg); 972 vec[0].iov_base = msg; 973 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); 974 975 ret = o2net_prep_nsw(nn, &nsw); 976 if (ret) 977 goto out; 978 979 msg->msg_num = cpu_to_be32(nsw.ns_id); 980 981 /* finally, convert the message header to network byte-order 982 * and send */ 983 mutex_lock(&sc->sc_send_lock); 984 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, 985 sizeof(struct o2net_msg) + caller_bytes); 986 mutex_unlock(&sc->sc_send_lock); 987 msglog(msg, "sending returned %d\n", ret); 988 if (ret < 0) { 989 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); 990 goto out; 991 } 992 993 /* wait on other node's handler */ 994 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); 995 996 /* Note that we avoid overwriting the callers status return 997 * variable if a system error was reported on the other 998 * side. Callers beware. */ 999 ret = o2net_sys_err_to_errno(nsw.ns_sys_status); 1000 if (status && !ret) 1001 *status = nsw.ns_status; 1002 1003 mlog(0, "woken, returning system status %d, user status %d\n", 1004 ret, nsw.ns_status); 1005 out: 1006 if (sc) 1007 sc_put(sc); 1008 if (vec) 1009 kfree(vec); 1010 if (msg) 1011 kfree(msg); 1012 o2net_complete_nsw(nn, &nsw, 0, 0, 0); 1013 return ret; 1014 } 1015 EXPORT_SYMBOL_GPL(o2net_send_message_vec); 1016 1017 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, 1018 u8 target_node, int *status) 1019 { 1020 struct kvec vec = { 1021 .iov_base = data, 1022 .iov_len = len, 1023 }; 1024 return o2net_send_message_vec(msg_type, key, &vec, 1, 1025 target_node, status); 1026 } 1027 EXPORT_SYMBOL_GPL(o2net_send_message); 1028 1029 static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, 1030 enum o2net_system_error syserr, int err) 1031 { 1032 struct kvec vec = { 1033 .iov_base = hdr, 1034 .iov_len = sizeof(struct o2net_msg), 1035 }; 1036 1037 BUG_ON(syserr >= O2NET_ERR_MAX); 1038 1039 /* leave other fields intact from the incoming message, msg_num 1040 * in particular */ 1041 hdr->sys_status = cpu_to_be32(syserr); 1042 hdr->status = cpu_to_be32(err); 1043 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic 1044 hdr->data_len = 0; 1045 1046 msglog(hdr, "about to send status magic %d\n", err); 1047 /* hdr has been in host byteorder this whole time */ 1048 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); 1049 } 1050 1051 /* this returns -errno if the header was unknown or too large, etc. 1052 * after this is called the buffer us reused for the next message */ 1053 static int o2net_process_message(struct o2net_sock_container *sc, 1054 struct o2net_msg *hdr) 1055 { 1056 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); 1057 int ret = 0, handler_status; 1058 enum o2net_system_error syserr; 1059 struct o2net_msg_handler *nmh = NULL; 1060 void *ret_data = NULL; 1061 1062 msglog(hdr, "processing message\n"); 1063 1064 o2net_sc_postpone_idle(sc); 1065 1066 switch(be16_to_cpu(hdr->magic)) { 1067 case O2NET_MSG_STATUS_MAGIC: 1068 /* special type for returning message status */ 1069 o2net_complete_nsw(nn, NULL, 1070 be32_to_cpu(hdr->msg_num), 1071 be32_to_cpu(hdr->sys_status), 1072 be32_to_cpu(hdr->status)); 1073 goto out; 1074 case O2NET_MSG_KEEP_REQ_MAGIC: 1075 o2net_sendpage(sc, o2net_keep_resp, 1076 sizeof(*o2net_keep_resp)); 1077 goto out; 1078 case O2NET_MSG_KEEP_RESP_MAGIC: 1079 goto out; 1080 case O2NET_MSG_MAGIC: 1081 break; 1082 default: 1083 msglog(hdr, "bad magic\n"); 1084 ret = -EINVAL; 1085 goto out; 1086 break; 1087 } 1088 1089 /* find a handler for it */ 1090 handler_status = 0; 1091 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), 1092 be32_to_cpu(hdr->key)); 1093 if (!nmh) { 1094 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", 1095 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); 1096 syserr = O2NET_ERR_NO_HNDLR; 1097 goto out_respond; 1098 } 1099 1100 syserr = O2NET_ERR_NONE; 1101 1102 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) 1103 syserr = O2NET_ERR_OVERFLOW; 1104 1105 if (syserr != O2NET_ERR_NONE) 1106 goto out_respond; 1107 1108 do_gettimeofday(&sc->sc_tv_func_start); 1109 sc->sc_msg_key = be32_to_cpu(hdr->key); 1110 sc->sc_msg_type = be16_to_cpu(hdr->msg_type); 1111 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + 1112 be16_to_cpu(hdr->data_len), 1113 nmh->nh_func_data, &ret_data); 1114 do_gettimeofday(&sc->sc_tv_func_stop); 1115 1116 out_respond: 1117 /* this destroys the hdr, so don't use it after this */ 1118 mutex_lock(&sc->sc_send_lock); 1119 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, 1120 handler_status); 1121 mutex_unlock(&sc->sc_send_lock); 1122 hdr = NULL; 1123 mlog(0, "sending handler status %d, syserr %d returned %d\n", 1124 handler_status, syserr, ret); 1125 1126 if (nmh) { 1127 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); 1128 if (nmh->nh_post_func) 1129 (nmh->nh_post_func)(handler_status, nmh->nh_func_data, 1130 ret_data); 1131 } 1132 1133 out: 1134 if (nmh) 1135 o2net_handler_put(nmh); 1136 return ret; 1137 } 1138 1139 static int o2net_check_handshake(struct o2net_sock_container *sc) 1140 { 1141 struct o2net_handshake *hand = page_address(sc->sc_page); 1142 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); 1143 1144 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { 1145 mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol " 1146 "version %llu but %llu is required, disconnecting\n", 1147 SC_NODEF_ARGS(sc), 1148 (unsigned long long)be64_to_cpu(hand->protocol_version), 1149 O2NET_PROTOCOL_VERSION); 1150 1151 /* don't bother reconnecting if its the wrong version. */ 1152 o2net_ensure_shutdown(nn, sc, -ENOTCONN); 1153 return -1; 1154 } 1155 1156 /* 1157 * Ensure timeouts are consistent with other nodes, otherwise 1158 * we can end up with one node thinking that the other must be down, 1159 * but isn't. This can ultimately cause corruption. 1160 */ 1161 if (be32_to_cpu(hand->o2net_idle_timeout_ms) != 1162 o2net_idle_timeout(sc->sc_node)) { 1163 mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of " 1164 "%u ms, but we use %u ms locally. disconnecting\n", 1165 SC_NODEF_ARGS(sc), 1166 be32_to_cpu(hand->o2net_idle_timeout_ms), 1167 o2net_idle_timeout(sc->sc_node)); 1168 o2net_ensure_shutdown(nn, sc, -ENOTCONN); 1169 return -1; 1170 } 1171 1172 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != 1173 o2net_keepalive_delay(sc->sc_node)) { 1174 mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of " 1175 "%u ms, but we use %u ms locally. disconnecting\n", 1176 SC_NODEF_ARGS(sc), 1177 be32_to_cpu(hand->o2net_keepalive_delay_ms), 1178 o2net_keepalive_delay(sc->sc_node)); 1179 o2net_ensure_shutdown(nn, sc, -ENOTCONN); 1180 return -1; 1181 } 1182 1183 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != 1184 O2HB_MAX_WRITE_TIMEOUT_MS) { 1185 mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of " 1186 "%u ms, but we use %u ms locally. disconnecting\n", 1187 SC_NODEF_ARGS(sc), 1188 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), 1189 O2HB_MAX_WRITE_TIMEOUT_MS); 1190 o2net_ensure_shutdown(nn, sc, -ENOTCONN); 1191 return -1; 1192 } 1193 1194 sc->sc_handshake_ok = 1; 1195 1196 spin_lock(&nn->nn_lock); 1197 /* set valid and queue the idle timers only if it hasn't been 1198 * shut down already */ 1199 if (nn->nn_sc == sc) { 1200 o2net_sc_reset_idle_timer(sc); 1201 o2net_set_nn_state(nn, sc, 1, 0); 1202 } 1203 spin_unlock(&nn->nn_lock); 1204 1205 /* shift everything up as though it wasn't there */ 1206 sc->sc_page_off -= sizeof(struct o2net_handshake); 1207 if (sc->sc_page_off) 1208 memmove(hand, hand + 1, sc->sc_page_off); 1209 1210 return 0; 1211 } 1212 1213 /* this demuxes the queued rx bytes into header or payload bits and calls 1214 * handlers as each full message is read off the socket. it returns -error, 1215 * == 0 eof, or > 0 for progress made.*/ 1216 static int o2net_advance_rx(struct o2net_sock_container *sc) 1217 { 1218 struct o2net_msg *hdr; 1219 int ret = 0; 1220 void *data; 1221 size_t datalen; 1222 1223 sclog(sc, "receiving\n"); 1224 do_gettimeofday(&sc->sc_tv_advance_start); 1225 1226 if (unlikely(sc->sc_handshake_ok == 0)) { 1227 if(sc->sc_page_off < sizeof(struct o2net_handshake)) { 1228 data = page_address(sc->sc_page) + sc->sc_page_off; 1229 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; 1230 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); 1231 if (ret > 0) 1232 sc->sc_page_off += ret; 1233 } 1234 1235 if (sc->sc_page_off == sizeof(struct o2net_handshake)) { 1236 o2net_check_handshake(sc); 1237 if (unlikely(sc->sc_handshake_ok == 0)) 1238 ret = -EPROTO; 1239 } 1240 goto out; 1241 } 1242 1243 /* do we need more header? */ 1244 if (sc->sc_page_off < sizeof(struct o2net_msg)) { 1245 data = page_address(sc->sc_page) + sc->sc_page_off; 1246 datalen = sizeof(struct o2net_msg) - sc->sc_page_off; 1247 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); 1248 if (ret > 0) { 1249 sc->sc_page_off += ret; 1250 /* only swab incoming here.. we can 1251 * only get here once as we cross from 1252 * being under to over */ 1253 if (sc->sc_page_off == sizeof(struct o2net_msg)) { 1254 hdr = page_address(sc->sc_page); 1255 if (be16_to_cpu(hdr->data_len) > 1256 O2NET_MAX_PAYLOAD_BYTES) 1257 ret = -EOVERFLOW; 1258 } 1259 } 1260 if (ret <= 0) 1261 goto out; 1262 } 1263 1264 if (sc->sc_page_off < sizeof(struct o2net_msg)) { 1265 /* oof, still don't have a header */ 1266 goto out; 1267 } 1268 1269 /* this was swabbed above when we first read it */ 1270 hdr = page_address(sc->sc_page); 1271 1272 msglog(hdr, "at page_off %zu\n", sc->sc_page_off); 1273 1274 /* do we need more payload? */ 1275 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { 1276 /* need more payload */ 1277 data = page_address(sc->sc_page) + sc->sc_page_off; 1278 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - 1279 sc->sc_page_off; 1280 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); 1281 if (ret > 0) 1282 sc->sc_page_off += ret; 1283 if (ret <= 0) 1284 goto out; 1285 } 1286 1287 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { 1288 /* we can only get here once, the first time we read 1289 * the payload.. so set ret to progress if the handler 1290 * works out. after calling this the message is toast */ 1291 ret = o2net_process_message(sc, hdr); 1292 if (ret == 0) 1293 ret = 1; 1294 sc->sc_page_off = 0; 1295 } 1296 1297 out: 1298 sclog(sc, "ret = %d\n", ret); 1299 do_gettimeofday(&sc->sc_tv_advance_stop); 1300 return ret; 1301 } 1302 1303 /* this work func is triggerd by data ready. it reads until it can read no 1304 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing 1305 * our work the work struct will be marked and we'll be called again. */ 1306 static void o2net_rx_until_empty(struct work_struct *work) 1307 { 1308 struct o2net_sock_container *sc = 1309 container_of(work, struct o2net_sock_container, sc_rx_work); 1310 int ret; 1311 1312 do { 1313 ret = o2net_advance_rx(sc); 1314 } while (ret > 0); 1315 1316 if (ret <= 0 && ret != -EAGAIN) { 1317 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); 1318 sclog(sc, "saw error %d, closing\n", ret); 1319 /* not permanent so read failed handshake can retry */ 1320 o2net_ensure_shutdown(nn, sc, 0); 1321 } 1322 1323 sc_put(sc); 1324 } 1325 1326 static int o2net_set_nodelay(struct socket *sock) 1327 { 1328 int ret, val = 1; 1329 mm_segment_t oldfs; 1330 1331 oldfs = get_fs(); 1332 set_fs(KERNEL_DS); 1333 1334 /* 1335 * Dear unsuspecting programmer, 1336 * 1337 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level 1338 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will 1339 * silently turn into SO_DEBUG. 1340 * 1341 * Yours, 1342 * Keeper of hilariously fragile interfaces. 1343 */ 1344 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, 1345 (char __user *)&val, sizeof(val)); 1346 1347 set_fs(oldfs); 1348 return ret; 1349 } 1350 1351 static void o2net_initialize_handshake(void) 1352 { 1353 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( 1354 O2HB_MAX_WRITE_TIMEOUT_MS); 1355 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32( 1356 o2net_idle_timeout(NULL)); 1357 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( 1358 o2net_keepalive_delay(NULL)); 1359 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( 1360 o2net_reconnect_delay(NULL)); 1361 } 1362 1363 /* ------------------------------------------------------------ */ 1364 1365 /* called when a connect completes and after a sock is accepted. the 1366 * rx path will see the response and mark the sc valid */ 1367 static void o2net_sc_connect_completed(struct work_struct *work) 1368 { 1369 struct o2net_sock_container *sc = 1370 container_of(work, struct o2net_sock_container, 1371 sc_connect_work); 1372 1373 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", 1374 (unsigned long long)O2NET_PROTOCOL_VERSION, 1375 (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); 1376 1377 o2net_initialize_handshake(); 1378 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); 1379 sc_put(sc); 1380 } 1381 1382 /* this is called as a work_struct func. */ 1383 static void o2net_sc_send_keep_req(struct work_struct *work) 1384 { 1385 struct o2net_sock_container *sc = 1386 container_of(work, struct o2net_sock_container, 1387 sc_keepalive_work.work); 1388 1389 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); 1390 sc_put(sc); 1391 } 1392 1393 /* socket shutdown does a del_timer_sync against this as it tears down. 1394 * we can't start this timer until we've got to the point in sc buildup 1395 * where shutdown is going to be involved */ 1396 static void o2net_idle_timer(unsigned long data) 1397 { 1398 struct o2net_sock_container *sc = (struct o2net_sock_container *)data; 1399 struct timeval now; 1400 1401 do_gettimeofday(&now); 1402 1403 printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u " 1404 "seconds, shutting it down.\n", SC_NODEF_ARGS(sc), 1405 o2net_idle_timeout(sc->sc_node) / 1000, 1406 o2net_idle_timeout(sc->sc_node) % 1000); 1407 mlog(ML_NOTICE, "here are some times that might help debug the " 1408 "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv " 1409 "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n", 1410 sc->sc_tv_timer.tv_sec, (long) sc->sc_tv_timer.tv_usec, 1411 now.tv_sec, (long) now.tv_usec, 1412 sc->sc_tv_data_ready.tv_sec, (long) sc->sc_tv_data_ready.tv_usec, 1413 sc->sc_tv_advance_start.tv_sec, 1414 (long) sc->sc_tv_advance_start.tv_usec, 1415 sc->sc_tv_advance_stop.tv_sec, 1416 (long) sc->sc_tv_advance_stop.tv_usec, 1417 sc->sc_msg_key, sc->sc_msg_type, 1418 sc->sc_tv_func_start.tv_sec, (long) sc->sc_tv_func_start.tv_usec, 1419 sc->sc_tv_func_stop.tv_sec, (long) sc->sc_tv_func_stop.tv_usec); 1420 1421 o2net_sc_queue_work(sc, &sc->sc_shutdown_work); 1422 } 1423 1424 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) 1425 { 1426 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); 1427 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, 1428 msecs_to_jiffies(o2net_keepalive_delay(sc->sc_node))); 1429 do_gettimeofday(&sc->sc_tv_timer); 1430 mod_timer(&sc->sc_idle_timeout, 1431 jiffies + msecs_to_jiffies(o2net_idle_timeout(sc->sc_node))); 1432 } 1433 1434 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) 1435 { 1436 /* Only push out an existing timer */ 1437 if (timer_pending(&sc->sc_idle_timeout)) 1438 o2net_sc_reset_idle_timer(sc); 1439 } 1440 1441 /* this work func is kicked whenever a path sets the nn state which doesn't 1442 * have valid set. This includes seeing hb come up, losing a connection, 1443 * having a connect attempt fail, etc. This centralizes the logic which decides 1444 * if a connect attempt should be made or if we should give up and all future 1445 * transmit attempts should fail */ 1446 static void o2net_start_connect(struct work_struct *work) 1447 { 1448 struct o2net_node *nn = 1449 container_of(work, struct o2net_node, nn_connect_work.work); 1450 struct o2net_sock_container *sc = NULL; 1451 struct o2nm_node *node = NULL, *mynode = NULL; 1452 struct socket *sock = NULL; 1453 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; 1454 int ret = 0, stop; 1455 1456 /* if we're greater we initiate tx, otherwise we accept */ 1457 if (o2nm_this_node() <= o2net_num_from_nn(nn)) 1458 goto out; 1459 1460 /* watch for racing with tearing a node down */ 1461 node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); 1462 if (node == NULL) { 1463 ret = 0; 1464 goto out; 1465 } 1466 1467 mynode = o2nm_get_node_by_num(o2nm_this_node()); 1468 if (mynode == NULL) { 1469 ret = 0; 1470 goto out; 1471 } 1472 1473 spin_lock(&nn->nn_lock); 1474 /* see if we already have one pending or have given up */ 1475 stop = (nn->nn_sc || nn->nn_persistent_error); 1476 spin_unlock(&nn->nn_lock); 1477 if (stop) 1478 goto out; 1479 1480 nn->nn_last_connect_attempt = jiffies; 1481 1482 sc = sc_alloc(node); 1483 if (sc == NULL) { 1484 mlog(0, "couldn't allocate sc\n"); 1485 ret = -ENOMEM; 1486 goto out; 1487 } 1488 1489 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); 1490 if (ret < 0) { 1491 mlog(0, "can't create socket: %d\n", ret); 1492 goto out; 1493 } 1494 sc->sc_sock = sock; /* freed by sc_kref_release */ 1495 1496 sock->sk->sk_allocation = GFP_ATOMIC; 1497 1498 myaddr.sin_family = AF_INET; 1499 myaddr.sin_addr.s_addr = (__force u32)mynode->nd_ipv4_address; 1500 myaddr.sin_port = (__force u16)htons(0); /* any port */ 1501 1502 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, 1503 sizeof(myaddr)); 1504 if (ret) { 1505 mlog(ML_ERROR, "bind failed with %d at address %u.%u.%u.%u\n", 1506 ret, NIPQUAD(mynode->nd_ipv4_address)); 1507 goto out; 1508 } 1509 1510 ret = o2net_set_nodelay(sc->sc_sock); 1511 if (ret) { 1512 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); 1513 goto out; 1514 } 1515 1516 o2net_register_callbacks(sc->sc_sock->sk, sc); 1517 1518 spin_lock(&nn->nn_lock); 1519 /* handshake completion will set nn->nn_sc_valid */ 1520 o2net_set_nn_state(nn, sc, 0, 0); 1521 spin_unlock(&nn->nn_lock); 1522 1523 remoteaddr.sin_family = AF_INET; 1524 remoteaddr.sin_addr.s_addr = (__force u32)node->nd_ipv4_address; 1525 remoteaddr.sin_port = (__force u16)node->nd_ipv4_port; 1526 1527 ret = sc->sc_sock->ops->connect(sc->sc_sock, 1528 (struct sockaddr *)&remoteaddr, 1529 sizeof(remoteaddr), 1530 O_NONBLOCK); 1531 if (ret == -EINPROGRESS) 1532 ret = 0; 1533 1534 out: 1535 if (ret) { 1536 mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed " 1537 "with errno %d\n", SC_NODEF_ARGS(sc), ret); 1538 /* 0 err so that another will be queued and attempted 1539 * from set_nn_state */ 1540 if (sc) 1541 o2net_ensure_shutdown(nn, sc, 0); 1542 } 1543 if (sc) 1544 sc_put(sc); 1545 if (node) 1546 o2nm_node_put(node); 1547 if (mynode) 1548 o2nm_node_put(mynode); 1549 1550 return; 1551 } 1552 1553 static void o2net_connect_expired(struct work_struct *work) 1554 { 1555 struct o2net_node *nn = 1556 container_of(work, struct o2net_node, nn_connect_expired.work); 1557 1558 spin_lock(&nn->nn_lock); 1559 if (!nn->nn_sc_valid) { 1560 struct o2nm_node *node = nn->nn_sc->sc_node; 1561 mlog(ML_ERROR, "no connection established with node %u after " 1562 "%u.%u seconds, giving up and returning errors.\n", 1563 o2net_num_from_nn(nn), 1564 o2net_idle_timeout(node) / 1000, 1565 o2net_idle_timeout(node) % 1000); 1566 1567 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); 1568 } 1569 spin_unlock(&nn->nn_lock); 1570 } 1571 1572 static void o2net_still_up(struct work_struct *work) 1573 { 1574 struct o2net_node *nn = 1575 container_of(work, struct o2net_node, nn_still_up.work); 1576 1577 o2quo_hb_still_up(o2net_num_from_nn(nn)); 1578 } 1579 1580 /* ------------------------------------------------------------ */ 1581 1582 void o2net_disconnect_node(struct o2nm_node *node) 1583 { 1584 struct o2net_node *nn = o2net_nn_from_num(node->nd_num); 1585 1586 /* don't reconnect until it's heartbeating again */ 1587 spin_lock(&nn->nn_lock); 1588 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); 1589 spin_unlock(&nn->nn_lock); 1590 1591 if (o2net_wq) { 1592 cancel_delayed_work(&nn->nn_connect_expired); 1593 cancel_delayed_work(&nn->nn_connect_work); 1594 cancel_delayed_work(&nn->nn_still_up); 1595 flush_workqueue(o2net_wq); 1596 } 1597 } 1598 1599 static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, 1600 void *data) 1601 { 1602 o2quo_hb_down(node_num); 1603 1604 if (node_num != o2nm_this_node()) 1605 o2net_disconnect_node(node); 1606 1607 BUG_ON(atomic_read(&o2net_connected_peers) < 0); 1608 } 1609 1610 static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, 1611 void *data) 1612 { 1613 struct o2net_node *nn = o2net_nn_from_num(node_num); 1614 1615 o2quo_hb_up(node_num); 1616 1617 /* ensure an immediate connect attempt */ 1618 nn->nn_last_connect_attempt = jiffies - 1619 (msecs_to_jiffies(o2net_reconnect_delay(node)) + 1); 1620 1621 if (node_num != o2nm_this_node()) { 1622 /* heartbeat doesn't work unless a local node number is 1623 * configured and doing so brings up the o2net_wq, so we can 1624 * use it.. */ 1625 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, 1626 msecs_to_jiffies(o2net_idle_timeout(node))); 1627 1628 /* believe it or not, accept and node hearbeating testing 1629 * can succeed for this node before we got here.. so 1630 * only use set_nn_state to clear the persistent error 1631 * if that hasn't already happened */ 1632 spin_lock(&nn->nn_lock); 1633 if (nn->nn_persistent_error) 1634 o2net_set_nn_state(nn, NULL, 0, 0); 1635 spin_unlock(&nn->nn_lock); 1636 } 1637 } 1638 1639 void o2net_unregister_hb_callbacks(void) 1640 { 1641 int ret; 1642 1643 ret = o2hb_unregister_callback(&o2net_hb_up); 1644 if (ret < 0) 1645 mlog(ML_ERROR, "Status return %d unregistering heartbeat up " 1646 "callback!\n", ret); 1647 1648 ret = o2hb_unregister_callback(&o2net_hb_down); 1649 if (ret < 0) 1650 mlog(ML_ERROR, "Status return %d unregistering heartbeat down " 1651 "callback!\n", ret); 1652 } 1653 1654 int o2net_register_hb_callbacks(void) 1655 { 1656 int ret; 1657 1658 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, 1659 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); 1660 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, 1661 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); 1662 1663 ret = o2hb_register_callback(&o2net_hb_up); 1664 if (ret == 0) 1665 ret = o2hb_register_callback(&o2net_hb_down); 1666 1667 if (ret) 1668 o2net_unregister_hb_callbacks(); 1669 1670 return ret; 1671 } 1672 1673 /* ------------------------------------------------------------ */ 1674 1675 static int o2net_accept_one(struct socket *sock) 1676 { 1677 int ret, slen; 1678 struct sockaddr_in sin; 1679 struct socket *new_sock = NULL; 1680 struct o2nm_node *node = NULL; 1681 struct o2net_sock_container *sc = NULL; 1682 struct o2net_node *nn; 1683 1684 BUG_ON(sock == NULL); 1685 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, 1686 sock->sk->sk_protocol, &new_sock); 1687 if (ret) 1688 goto out; 1689 1690 new_sock->type = sock->type; 1691 new_sock->ops = sock->ops; 1692 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); 1693 if (ret < 0) 1694 goto out; 1695 1696 new_sock->sk->sk_allocation = GFP_ATOMIC; 1697 1698 ret = o2net_set_nodelay(new_sock); 1699 if (ret) { 1700 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); 1701 goto out; 1702 } 1703 1704 slen = sizeof(sin); 1705 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, 1706 &slen, 1); 1707 if (ret < 0) 1708 goto out; 1709 1710 node = o2nm_get_node_by_ip((__force __be32)sin.sin_addr.s_addr); 1711 if (node == NULL) { 1712 mlog(ML_NOTICE, "attempt to connect from unknown node at " 1713 "%u.%u.%u.%u:%d\n", NIPQUAD(sin.sin_addr.s_addr), 1714 ntohs((__force __be16)sin.sin_port)); 1715 ret = -EINVAL; 1716 goto out; 1717 } 1718 1719 if (o2nm_this_node() > node->nd_num) { 1720 mlog(ML_NOTICE, "unexpected connect attempted from a lower " 1721 "numbered node '%s' at " "%u.%u.%u.%u:%d with num %u\n", 1722 node->nd_name, NIPQUAD(sin.sin_addr.s_addr), 1723 ntohs((__force __be16)sin.sin_port), node->nd_num); 1724 ret = -EINVAL; 1725 goto out; 1726 } 1727 1728 /* this happens all the time when the other node sees our heartbeat 1729 * and tries to connect before we see their heartbeat */ 1730 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { 1731 mlog(ML_CONN, "attempt to connect from node '%s' at " 1732 "%u.%u.%u.%u:%d but it isn't heartbeating\n", 1733 node->nd_name, NIPQUAD(sin.sin_addr.s_addr), 1734 ntohs((__force __be16)sin.sin_port)); 1735 ret = -EINVAL; 1736 goto out; 1737 } 1738 1739 nn = o2net_nn_from_num(node->nd_num); 1740 1741 spin_lock(&nn->nn_lock); 1742 if (nn->nn_sc) 1743 ret = -EBUSY; 1744 else 1745 ret = 0; 1746 spin_unlock(&nn->nn_lock); 1747 if (ret) { 1748 mlog(ML_NOTICE, "attempt to connect from node '%s' at " 1749 "%u.%u.%u.%u:%d but it already has an open connection\n", 1750 node->nd_name, NIPQUAD(sin.sin_addr.s_addr), 1751 ntohs((__force __be16)sin.sin_port)); 1752 goto out; 1753 } 1754 1755 sc = sc_alloc(node); 1756 if (sc == NULL) { 1757 ret = -ENOMEM; 1758 goto out; 1759 } 1760 1761 sc->sc_sock = new_sock; 1762 new_sock = NULL; 1763 1764 spin_lock(&nn->nn_lock); 1765 o2net_set_nn_state(nn, sc, 0, 0); 1766 spin_unlock(&nn->nn_lock); 1767 1768 o2net_register_callbacks(sc->sc_sock->sk, sc); 1769 o2net_sc_queue_work(sc, &sc->sc_rx_work); 1770 1771 o2net_initialize_handshake(); 1772 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); 1773 1774 out: 1775 if (new_sock) 1776 sock_release(new_sock); 1777 if (node) 1778 o2nm_node_put(node); 1779 if (sc) 1780 sc_put(sc); 1781 return ret; 1782 } 1783 1784 static void o2net_accept_many(struct work_struct *work) 1785 { 1786 struct socket *sock = o2net_listen_sock; 1787 while (o2net_accept_one(sock) == 0) 1788 cond_resched(); 1789 } 1790 1791 static void o2net_listen_data_ready(struct sock *sk, int bytes) 1792 { 1793 void (*ready)(struct sock *sk, int bytes); 1794 1795 read_lock(&sk->sk_callback_lock); 1796 ready = sk->sk_user_data; 1797 if (ready == NULL) { /* check for teardown race */ 1798 ready = sk->sk_data_ready; 1799 goto out; 1800 } 1801 1802 /* ->sk_data_ready is also called for a newly established child socket 1803 * before it has been accepted and the acceptor has set up their 1804 * data_ready.. we only want to queue listen work for our listening 1805 * socket */ 1806 if (sk->sk_state == TCP_LISTEN) { 1807 mlog(ML_TCP, "bytes: %d\n", bytes); 1808 queue_work(o2net_wq, &o2net_listen_work); 1809 } 1810 1811 out: 1812 read_unlock(&sk->sk_callback_lock); 1813 ready(sk, bytes); 1814 } 1815 1816 static int o2net_open_listening_sock(__be32 addr, __be16 port) 1817 { 1818 struct socket *sock = NULL; 1819 int ret; 1820 struct sockaddr_in sin = { 1821 .sin_family = PF_INET, 1822 .sin_addr = { .s_addr = (__force u32)addr }, 1823 .sin_port = (__force u16)port, 1824 }; 1825 1826 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); 1827 if (ret < 0) { 1828 mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret); 1829 goto out; 1830 } 1831 1832 sock->sk->sk_allocation = GFP_ATOMIC; 1833 1834 write_lock_bh(&sock->sk->sk_callback_lock); 1835 sock->sk->sk_user_data = sock->sk->sk_data_ready; 1836 sock->sk->sk_data_ready = o2net_listen_data_ready; 1837 write_unlock_bh(&sock->sk->sk_callback_lock); 1838 1839 o2net_listen_sock = sock; 1840 INIT_WORK(&o2net_listen_work, o2net_accept_many); 1841 1842 sock->sk->sk_reuse = 1; 1843 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); 1844 if (ret < 0) { 1845 mlog(ML_ERROR, "unable to bind socket at %u.%u.%u.%u:%u, " 1846 "ret=%d\n", NIPQUAD(addr), ntohs(port), ret); 1847 goto out; 1848 } 1849 1850 ret = sock->ops->listen(sock, 64); 1851 if (ret < 0) { 1852 mlog(ML_ERROR, "unable to listen on %u.%u.%u.%u:%u, ret=%d\n", 1853 NIPQUAD(addr), ntohs(port), ret); 1854 } 1855 1856 out: 1857 if (ret) { 1858 o2net_listen_sock = NULL; 1859 if (sock) 1860 sock_release(sock); 1861 } 1862 return ret; 1863 } 1864 1865 /* 1866 * called from node manager when we should bring up our network listening 1867 * socket. node manager handles all the serialization to only call this 1868 * once and to match it with o2net_stop_listening(). note, 1869 * o2nm_this_node() doesn't work yet as we're being called while it 1870 * is being set up. 1871 */ 1872 int o2net_start_listening(struct o2nm_node *node) 1873 { 1874 int ret = 0; 1875 1876 BUG_ON(o2net_wq != NULL); 1877 BUG_ON(o2net_listen_sock != NULL); 1878 1879 mlog(ML_KTHREAD, "starting o2net thread...\n"); 1880 o2net_wq = create_singlethread_workqueue("o2net"); 1881 if (o2net_wq == NULL) { 1882 mlog(ML_ERROR, "unable to launch o2net thread\n"); 1883 return -ENOMEM; /* ? */ 1884 } 1885 1886 ret = o2net_open_listening_sock(node->nd_ipv4_address, 1887 node->nd_ipv4_port); 1888 if (ret) { 1889 destroy_workqueue(o2net_wq); 1890 o2net_wq = NULL; 1891 } else 1892 o2quo_conn_up(node->nd_num); 1893 1894 return ret; 1895 } 1896 1897 /* again, o2nm_this_node() doesn't work here as we're involved in 1898 * tearing it down */ 1899 void o2net_stop_listening(struct o2nm_node *node) 1900 { 1901 struct socket *sock = o2net_listen_sock; 1902 size_t i; 1903 1904 BUG_ON(o2net_wq == NULL); 1905 BUG_ON(o2net_listen_sock == NULL); 1906 1907 /* stop the listening socket from generating work */ 1908 write_lock_bh(&sock->sk->sk_callback_lock); 1909 sock->sk->sk_data_ready = sock->sk->sk_user_data; 1910 sock->sk->sk_user_data = NULL; 1911 write_unlock_bh(&sock->sk->sk_callback_lock); 1912 1913 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { 1914 struct o2nm_node *node = o2nm_get_node_by_num(i); 1915 if (node) { 1916 o2net_disconnect_node(node); 1917 o2nm_node_put(node); 1918 } 1919 } 1920 1921 /* finish all work and tear down the work queue */ 1922 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); 1923 destroy_workqueue(o2net_wq); 1924 o2net_wq = NULL; 1925 1926 sock_release(o2net_listen_sock); 1927 o2net_listen_sock = NULL; 1928 1929 o2quo_conn_err(node->nd_num); 1930 } 1931 1932 /* ------------------------------------------------------------ */ 1933 1934 int o2net_init(void) 1935 { 1936 unsigned long i; 1937 1938 o2quo_init(); 1939 1940 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); 1941 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); 1942 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); 1943 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) { 1944 kfree(o2net_hand); 1945 kfree(o2net_keep_req); 1946 kfree(o2net_keep_resp); 1947 return -ENOMEM; 1948 } 1949 1950 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); 1951 o2net_hand->connector_id = cpu_to_be64(1); 1952 1953 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); 1954 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); 1955 1956 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { 1957 struct o2net_node *nn = o2net_nn_from_num(i); 1958 1959 spin_lock_init(&nn->nn_lock); 1960 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); 1961 INIT_DELAYED_WORK(&nn->nn_connect_expired, 1962 o2net_connect_expired); 1963 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); 1964 /* until we see hb from a node we'll return einval */ 1965 nn->nn_persistent_error = -ENOTCONN; 1966 init_waitqueue_head(&nn->nn_sc_wq); 1967 idr_init(&nn->nn_status_idr); 1968 INIT_LIST_HEAD(&nn->nn_status_list); 1969 } 1970 1971 return 0; 1972 } 1973 1974 void o2net_exit(void) 1975 { 1976 o2quo_exit(); 1977 kfree(o2net_hand); 1978 kfree(o2net_keep_req); 1979 kfree(o2net_keep_resp); 1980 } 1981