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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 <linux/net.h> |
62 | #include <net/tcp.h> |
63 | |
64 | #include <asm/uaccess.h> |
65 | |
66 | #include "heartbeat.h" |
67 | #include "tcp.h" |
68 | #include "nodemanager.h" |
69 | #define MLOG_MASK_PREFIX ML_TCP |
70 | #include "masklog.h" |
71 | #include "quorum.h" |
72 | |
73 | #include "tcp_internal.h" |
74 | |
75 | #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" |
76 | #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ |
77 | &sc->sc_node->nd_ipv4_address, \ |
78 | ntohs(sc->sc_node->nd_ipv4_port) |
79 | |
80 | /* |
81 | * In the following two log macros, the whitespace after the ',' just |
82 | * before ##args is intentional. Otherwise, gcc 2.95 will eat the |
83 | * previous token if args expands to nothing. |
84 | */ |
85 | #define msglog(hdr, fmt, args...) do { \ |
86 | typeof(hdr) __hdr = (hdr); \ |
87 | mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ |
88 | "key %08x num %u] " fmt, \ |
89 | be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ |
90 | be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ |
91 | be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ |
92 | be32_to_cpu(__hdr->msg_num) , ##args); \ |
93 | } while (0) |
94 | |
95 | #define sclog(sc, fmt, args...) do { \ |
96 | typeof(sc) __sc = (sc); \ |
97 | mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ |
98 | "pg_off %zu] " fmt, __sc, \ |
99 | atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ |
100 | __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ |
101 | ##args); \ |
102 | } while (0) |
103 | |
104 | static DEFINE_RWLOCK(o2net_handler_lock); |
105 | static struct rb_root o2net_handler_tree = RB_ROOT; |
106 | |
107 | static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; |
108 | |
109 | /* XXX someday we'll need better accounting */ |
110 | static struct socket *o2net_listen_sock = NULL; |
111 | |
112 | /* |
113 | * listen work is only queued by the listening socket callbacks on the |
114 | * o2net_wq. teardown detaches the callbacks before destroying the workqueue. |
115 | * quorum work is queued as sock containers are shutdown.. stop_listening |
116 | * tears down all the node's sock containers, preventing future shutdowns |
117 | * and queued quroum work, before canceling delayed quorum work and |
118 | * destroying the work queue. |
119 | */ |
120 | static struct workqueue_struct *o2net_wq; |
121 | static struct work_struct o2net_listen_work; |
122 | |
123 | static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; |
124 | #define O2NET_HB_PRI 0x1 |
125 | |
126 | static struct o2net_handshake *o2net_hand; |
127 | static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; |
128 | |
129 | static int o2net_sys_err_translations[O2NET_ERR_MAX] = |
130 | {[O2NET_ERR_NONE] = 0, |
131 | [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, |
132 | [O2NET_ERR_OVERFLOW] = -EOVERFLOW, |
133 | [O2NET_ERR_DIED] = -EHOSTDOWN,}; |
134 | |
135 | /* can't quite avoid *all* internal declarations :/ */ |
136 | static void o2net_sc_connect_completed(struct work_struct *work); |
137 | static void o2net_rx_until_empty(struct work_struct *work); |
138 | static void o2net_shutdown_sc(struct work_struct *work); |
139 | static void o2net_listen_data_ready(struct sock *sk, int bytes); |
140 | static void o2net_sc_send_keep_req(struct work_struct *work); |
141 | static void o2net_idle_timer(unsigned long data); |
142 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); |
143 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); |
144 | |
145 | #ifdef CONFIG_DEBUG_FS |
146 | static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, |
147 | u32 msgkey, struct task_struct *task, u8 node) |
148 | { |
149 | INIT_LIST_HEAD(&nst->st_net_debug_item); |
150 | nst->st_task = task; |
151 | nst->st_msg_type = msgtype; |
152 | nst->st_msg_key = msgkey; |
153 | nst->st_node = node; |
154 | } |
155 | |
156 | static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) |
157 | { |
158 | nst->st_sock_time = ktime_get(); |
159 | } |
160 | |
161 | static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) |
162 | { |
163 | nst->st_send_time = ktime_get(); |
164 | } |
165 | |
166 | static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) |
167 | { |
168 | nst->st_status_time = ktime_get(); |
169 | } |
170 | |
171 | static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, |
172 | struct o2net_sock_container *sc) |
173 | { |
174 | nst->st_sc = sc; |
175 | } |
176 | |
177 | static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, |
178 | u32 msg_id) |
179 | { |
180 | nst->st_id = msg_id; |
181 | } |
182 | |
183 | static inline void o2net_set_sock_timer(struct o2net_sock_container *sc) |
184 | { |
185 | sc->sc_tv_timer = ktime_get(); |
186 | } |
187 | |
188 | static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc) |
189 | { |
190 | sc->sc_tv_data_ready = ktime_get(); |
191 | } |
192 | |
193 | static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc) |
194 | { |
195 | sc->sc_tv_advance_start = ktime_get(); |
196 | } |
197 | |
198 | static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc) |
199 | { |
200 | sc->sc_tv_advance_stop = ktime_get(); |
201 | } |
202 | |
203 | static inline void o2net_set_func_start_time(struct o2net_sock_container *sc) |
204 | { |
205 | sc->sc_tv_func_start = ktime_get(); |
206 | } |
207 | |
208 | static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc) |
209 | { |
210 | sc->sc_tv_func_stop = ktime_get(); |
211 | } |
212 | |
213 | #else /* CONFIG_DEBUG_FS */ |
214 | # define o2net_init_nst(a, b, c, d, e) |
215 | # define o2net_set_nst_sock_time(a) |
216 | # define o2net_set_nst_send_time(a) |
217 | # define o2net_set_nst_status_time(a) |
218 | # define o2net_set_nst_sock_container(a, b) |
219 | # define o2net_set_nst_msg_id(a, b) |
220 | # define o2net_set_sock_timer(a) |
221 | # define o2net_set_data_ready_time(a) |
222 | # define o2net_set_advance_start_time(a) |
223 | # define o2net_set_advance_stop_time(a) |
224 | # define o2net_set_func_start_time(a) |
225 | # define o2net_set_func_stop_time(a) |
226 | #endif /* CONFIG_DEBUG_FS */ |
227 | |
228 | #ifdef CONFIG_OCFS2_FS_STATS |
229 | static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc) |
230 | { |
231 | return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); |
232 | } |
233 | |
234 | static void o2net_update_send_stats(struct o2net_send_tracking *nst, |
235 | struct o2net_sock_container *sc) |
236 | { |
237 | sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, |
238 | ktime_sub(ktime_get(), |
239 | nst->st_status_time)); |
240 | sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, |
241 | ktime_sub(nst->st_status_time, |
242 | nst->st_send_time)); |
243 | sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, |
244 | ktime_sub(nst->st_send_time, |
245 | nst->st_sock_time)); |
246 | sc->sc_send_count++; |
247 | } |
248 | |
249 | static void o2net_update_recv_stats(struct o2net_sock_container *sc) |
250 | { |
251 | sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, |
252 | o2net_get_func_run_time(sc)); |
253 | sc->sc_recv_count++; |
254 | } |
255 | |
256 | #else |
257 | |
258 | # define o2net_update_send_stats(a, b) |
259 | |
260 | # define o2net_update_recv_stats(sc) |
261 | |
262 | #endif /* CONFIG_OCFS2_FS_STATS */ |
263 | |
264 | static inline int o2net_reconnect_delay(void) |
265 | { |
266 | return o2nm_single_cluster->cl_reconnect_delay_ms; |
267 | } |
268 | |
269 | static inline int o2net_keepalive_delay(void) |
270 | { |
271 | return o2nm_single_cluster->cl_keepalive_delay_ms; |
272 | } |
273 | |
274 | static inline int o2net_idle_timeout(void) |
275 | { |
276 | return o2nm_single_cluster->cl_idle_timeout_ms; |
277 | } |
278 | |
279 | static inline int o2net_sys_err_to_errno(enum o2net_system_error err) |
280 | { |
281 | int trans; |
282 | BUG_ON(err >= O2NET_ERR_MAX); |
283 | trans = o2net_sys_err_translations[err]; |
284 | |
285 | /* Just in case we mess up the translation table above */ |
286 | BUG_ON(err != O2NET_ERR_NONE && trans == 0); |
287 | return trans; |
288 | } |
289 | |
290 | static struct o2net_node * o2net_nn_from_num(u8 node_num) |
291 | { |
292 | BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); |
293 | return &o2net_nodes[node_num]; |
294 | } |
295 | |
296 | static u8 o2net_num_from_nn(struct o2net_node *nn) |
297 | { |
298 | BUG_ON(nn == NULL); |
299 | return nn - o2net_nodes; |
300 | } |
301 | |
302 | /* ------------------------------------------------------------ */ |
303 | |
304 | static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) |
305 | { |
306 | int ret = 0; |
307 | |
308 | do { |
309 | if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { |
310 | ret = -EAGAIN; |
311 | break; |
312 | } |
313 | spin_lock(&nn->nn_lock); |
314 | ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); |
315 | if (ret == 0) |
316 | list_add_tail(&nsw->ns_node_item, |
317 | &nn->nn_status_list); |
318 | spin_unlock(&nn->nn_lock); |
319 | } while (ret == -EAGAIN); |
320 | |
321 | if (ret == 0) { |
322 | init_waitqueue_head(&nsw->ns_wq); |
323 | nsw->ns_sys_status = O2NET_ERR_NONE; |
324 | nsw->ns_status = 0; |
325 | } |
326 | |
327 | return ret; |
328 | } |
329 | |
330 | static void o2net_complete_nsw_locked(struct o2net_node *nn, |
331 | struct o2net_status_wait *nsw, |
332 | enum o2net_system_error sys_status, |
333 | s32 status) |
334 | { |
335 | assert_spin_locked(&nn->nn_lock); |
336 | |
337 | if (!list_empty(&nsw->ns_node_item)) { |
338 | list_del_init(&nsw->ns_node_item); |
339 | nsw->ns_sys_status = sys_status; |
340 | nsw->ns_status = status; |
341 | idr_remove(&nn->nn_status_idr, nsw->ns_id); |
342 | wake_up(&nsw->ns_wq); |
343 | } |
344 | } |
345 | |
346 | static void o2net_complete_nsw(struct o2net_node *nn, |
347 | struct o2net_status_wait *nsw, |
348 | u64 id, enum o2net_system_error sys_status, |
349 | s32 status) |
350 | { |
351 | spin_lock(&nn->nn_lock); |
352 | if (nsw == NULL) { |
353 | if (id > INT_MAX) |
354 | goto out; |
355 | |
356 | nsw = idr_find(&nn->nn_status_idr, id); |
357 | if (nsw == NULL) |
358 | goto out; |
359 | } |
360 | |
361 | o2net_complete_nsw_locked(nn, nsw, sys_status, status); |
362 | |
363 | out: |
364 | spin_unlock(&nn->nn_lock); |
365 | return; |
366 | } |
367 | |
368 | static void o2net_complete_nodes_nsw(struct o2net_node *nn) |
369 | { |
370 | struct o2net_status_wait *nsw, *tmp; |
371 | unsigned int num_kills = 0; |
372 | |
373 | assert_spin_locked(&nn->nn_lock); |
374 | |
375 | list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { |
376 | o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); |
377 | num_kills++; |
378 | } |
379 | |
380 | mlog(0, "completed %d messages for node %u\n", num_kills, |
381 | o2net_num_from_nn(nn)); |
382 | } |
383 | |
384 | static int o2net_nsw_completed(struct o2net_node *nn, |
385 | struct o2net_status_wait *nsw) |
386 | { |
387 | int completed; |
388 | spin_lock(&nn->nn_lock); |
389 | completed = list_empty(&nsw->ns_node_item); |
390 | spin_unlock(&nn->nn_lock); |
391 | return completed; |
392 | } |
393 | |
394 | /* ------------------------------------------------------------ */ |
395 | |
396 | static void sc_kref_release(struct kref *kref) |
397 | { |
398 | struct o2net_sock_container *sc = container_of(kref, |
399 | struct o2net_sock_container, sc_kref); |
400 | BUG_ON(timer_pending(&sc->sc_idle_timeout)); |
401 | |
402 | sclog(sc, "releasing\n"); |
403 | |
404 | if (sc->sc_sock) { |
405 | sock_release(sc->sc_sock); |
406 | sc->sc_sock = NULL; |
407 | } |
408 | |
409 | o2nm_undepend_item(&sc->sc_node->nd_item); |
410 | o2nm_node_put(sc->sc_node); |
411 | sc->sc_node = NULL; |
412 | |
413 | o2net_debug_del_sc(sc); |
414 | kfree(sc); |
415 | } |
416 | |
417 | static void sc_put(struct o2net_sock_container *sc) |
418 | { |
419 | sclog(sc, "put\n"); |
420 | kref_put(&sc->sc_kref, sc_kref_release); |
421 | } |
422 | static void sc_get(struct o2net_sock_container *sc) |
423 | { |
424 | sclog(sc, "get\n"); |
425 | kref_get(&sc->sc_kref); |
426 | } |
427 | static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) |
428 | { |
429 | struct o2net_sock_container *sc, *ret = NULL; |
430 | struct page *page = NULL; |
431 | int status = 0; |
432 | |
433 | page = alloc_page(GFP_NOFS); |
434 | sc = kzalloc(sizeof(*sc), GFP_NOFS); |
435 | if (sc == NULL || page == NULL) |
436 | goto out; |
437 | |
438 | kref_init(&sc->sc_kref); |
439 | o2nm_node_get(node); |
440 | sc->sc_node = node; |
441 | |
442 | /* pin the node item of the remote node */ |
443 | status = o2nm_depend_item(&node->nd_item); |
444 | if (status) { |
445 | mlog_errno(status); |
446 | o2nm_node_put(node); |
447 | goto out; |
448 | } |
449 | INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); |
450 | INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); |
451 | INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); |
452 | INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); |
453 | |
454 | init_timer(&sc->sc_idle_timeout); |
455 | sc->sc_idle_timeout.function = o2net_idle_timer; |
456 | sc->sc_idle_timeout.data = (unsigned long)sc; |
457 | |
458 | sclog(sc, "alloced\n"); |
459 | |
460 | ret = sc; |
461 | sc->sc_page = page; |
462 | o2net_debug_add_sc(sc); |
463 | sc = NULL; |
464 | page = NULL; |
465 | |
466 | out: |
467 | if (page) |
468 | __free_page(page); |
469 | kfree(sc); |
470 | |
471 | return ret; |
472 | } |
473 | |
474 | /* ------------------------------------------------------------ */ |
475 | |
476 | static void o2net_sc_queue_work(struct o2net_sock_container *sc, |
477 | struct work_struct *work) |
478 | { |
479 | sc_get(sc); |
480 | if (!queue_work(o2net_wq, work)) |
481 | sc_put(sc); |
482 | } |
483 | static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, |
484 | struct delayed_work *work, |
485 | int delay) |
486 | { |
487 | sc_get(sc); |
488 | if (!queue_delayed_work(o2net_wq, work, delay)) |
489 | sc_put(sc); |
490 | } |
491 | static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, |
492 | struct delayed_work *work) |
493 | { |
494 | if (cancel_delayed_work(work)) |
495 | sc_put(sc); |
496 | } |
497 | |
498 | static atomic_t o2net_connected_peers = ATOMIC_INIT(0); |
499 | |
500 | int o2net_num_connected_peers(void) |
501 | { |
502 | return atomic_read(&o2net_connected_peers); |
503 | } |
504 | |
505 | static void o2net_set_nn_state(struct o2net_node *nn, |
506 | struct o2net_sock_container *sc, |
507 | unsigned valid, int err) |
508 | { |
509 | int was_valid = nn->nn_sc_valid; |
510 | int was_err = nn->nn_persistent_error; |
511 | struct o2net_sock_container *old_sc = nn->nn_sc; |
512 | |
513 | assert_spin_locked(&nn->nn_lock); |
514 | |
515 | if (old_sc && !sc) |
516 | atomic_dec(&o2net_connected_peers); |
517 | else if (!old_sc && sc) |
518 | atomic_inc(&o2net_connected_peers); |
519 | |
520 | /* the node num comparison and single connect/accept path should stop |
521 | * an non-null sc from being overwritten with another */ |
522 | BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); |
523 | mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); |
524 | mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); |
525 | |
526 | if (was_valid && !valid && err == 0) |
527 | err = -ENOTCONN; |
528 | |
529 | mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", |
530 | o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, |
531 | nn->nn_persistent_error, err); |
532 | |
533 | nn->nn_sc = sc; |
534 | nn->nn_sc_valid = valid ? 1 : 0; |
535 | nn->nn_persistent_error = err; |
536 | |
537 | /* mirrors o2net_tx_can_proceed() */ |
538 | if (nn->nn_persistent_error || nn->nn_sc_valid) |
539 | wake_up(&nn->nn_sc_wq); |
540 | |
541 | if (!was_err && nn->nn_persistent_error) { |
542 | o2quo_conn_err(o2net_num_from_nn(nn)); |
543 | queue_delayed_work(o2net_wq, &nn->nn_still_up, |
544 | msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); |
545 | } |
546 | |
547 | if (was_valid && !valid) { |
548 | printk(KERN_NOTICE "o2net: no longer connected to " |
549 | SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); |
550 | o2net_complete_nodes_nsw(nn); |
551 | } |
552 | |
553 | if (!was_valid && valid) { |
554 | o2quo_conn_up(o2net_num_from_nn(nn)); |
555 | cancel_delayed_work(&nn->nn_connect_expired); |
556 | printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", |
557 | o2nm_this_node() > sc->sc_node->nd_num ? |
558 | "connected to" : "accepted connection from", |
559 | SC_NODEF_ARGS(sc)); |
560 | } |
561 | |
562 | /* trigger the connecting worker func as long as we're not valid, |
563 | * it will back off if it shouldn't connect. This can be called |
564 | * from node config teardown and so needs to be careful about |
565 | * the work queue actually being up. */ |
566 | if (!valid && o2net_wq) { |
567 | unsigned long delay; |
568 | /* delay if we're within a RECONNECT_DELAY of the |
569 | * last attempt */ |
570 | delay = (nn->nn_last_connect_attempt + |
571 | msecs_to_jiffies(o2net_reconnect_delay())) |
572 | - jiffies; |
573 | if (delay > msecs_to_jiffies(o2net_reconnect_delay())) |
574 | delay = 0; |
575 | mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); |
576 | queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); |
577 | |
578 | /* |
579 | * Delay the expired work after idle timeout. |
580 | * |
581 | * We might have lots of failed connection attempts that run |
582 | * through here but we only cancel the connect_expired work when |
583 | * a connection attempt succeeds. So only the first enqueue of |
584 | * the connect_expired work will do anything. The rest will see |
585 | * that it's already queued and do nothing. |
586 | */ |
587 | delay += msecs_to_jiffies(o2net_idle_timeout()); |
588 | queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); |
589 | } |
590 | |
591 | /* keep track of the nn's sc ref for the caller */ |
592 | if ((old_sc == NULL) && sc) |
593 | sc_get(sc); |
594 | if (old_sc && (old_sc != sc)) { |
595 | o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); |
596 | sc_put(old_sc); |
597 | } |
598 | } |
599 | |
600 | /* see o2net_register_callbacks() */ |
601 | static void o2net_data_ready(struct sock *sk, int bytes) |
602 | { |
603 | void (*ready)(struct sock *sk, int bytes); |
604 | |
605 | read_lock(&sk->sk_callback_lock); |
606 | if (sk->sk_user_data) { |
607 | struct o2net_sock_container *sc = sk->sk_user_data; |
608 | sclog(sc, "data_ready hit\n"); |
609 | o2net_set_data_ready_time(sc); |
610 | o2net_sc_queue_work(sc, &sc->sc_rx_work); |
611 | ready = sc->sc_data_ready; |
612 | } else { |
613 | ready = sk->sk_data_ready; |
614 | } |
615 | read_unlock(&sk->sk_callback_lock); |
616 | |
617 | ready(sk, bytes); |
618 | } |
619 | |
620 | /* see o2net_register_callbacks() */ |
621 | static void o2net_state_change(struct sock *sk) |
622 | { |
623 | void (*state_change)(struct sock *sk); |
624 | struct o2net_sock_container *sc; |
625 | |
626 | read_lock(&sk->sk_callback_lock); |
627 | sc = sk->sk_user_data; |
628 | if (sc == NULL) { |
629 | state_change = sk->sk_state_change; |
630 | goto out; |
631 | } |
632 | |
633 | sclog(sc, "state_change to %d\n", sk->sk_state); |
634 | |
635 | state_change = sc->sc_state_change; |
636 | |
637 | switch(sk->sk_state) { |
638 | /* ignore connecting sockets as they make progress */ |
639 | case TCP_SYN_SENT: |
640 | case TCP_SYN_RECV: |
641 | break; |
642 | case TCP_ESTABLISHED: |
643 | o2net_sc_queue_work(sc, &sc->sc_connect_work); |
644 | break; |
645 | default: |
646 | printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT |
647 | " shutdown, state %d\n", |
648 | SC_NODEF_ARGS(sc), sk->sk_state); |
649 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
650 | break; |
651 | } |
652 | out: |
653 | read_unlock(&sk->sk_callback_lock); |
654 | state_change(sk); |
655 | } |
656 | |
657 | /* |
658 | * we register callbacks so we can queue work on events before calling |
659 | * the original callbacks. our callbacks our careful to test user_data |
660 | * to discover when they've reaced with o2net_unregister_callbacks(). |
661 | */ |
662 | static void o2net_register_callbacks(struct sock *sk, |
663 | struct o2net_sock_container *sc) |
664 | { |
665 | write_lock_bh(&sk->sk_callback_lock); |
666 | |
667 | /* accepted sockets inherit the old listen socket data ready */ |
668 | if (sk->sk_data_ready == o2net_listen_data_ready) { |
669 | sk->sk_data_ready = sk->sk_user_data; |
670 | sk->sk_user_data = NULL; |
671 | } |
672 | |
673 | BUG_ON(sk->sk_user_data != NULL); |
674 | sk->sk_user_data = sc; |
675 | sc_get(sc); |
676 | |
677 | sc->sc_data_ready = sk->sk_data_ready; |
678 | sc->sc_state_change = sk->sk_state_change; |
679 | sk->sk_data_ready = o2net_data_ready; |
680 | sk->sk_state_change = o2net_state_change; |
681 | |
682 | mutex_init(&sc->sc_send_lock); |
683 | |
684 | write_unlock_bh(&sk->sk_callback_lock); |
685 | } |
686 | |
687 | static int o2net_unregister_callbacks(struct sock *sk, |
688 | struct o2net_sock_container *sc) |
689 | { |
690 | int ret = 0; |
691 | |
692 | write_lock_bh(&sk->sk_callback_lock); |
693 | if (sk->sk_user_data == sc) { |
694 | ret = 1; |
695 | sk->sk_user_data = NULL; |
696 | sk->sk_data_ready = sc->sc_data_ready; |
697 | sk->sk_state_change = sc->sc_state_change; |
698 | } |
699 | write_unlock_bh(&sk->sk_callback_lock); |
700 | |
701 | return ret; |
702 | } |
703 | |
704 | /* |
705 | * this is a little helper that is called by callers who have seen a problem |
706 | * with an sc and want to detach it from the nn if someone already hasn't beat |
707 | * them to it. if an error is given then the shutdown will be persistent |
708 | * and pending transmits will be canceled. |
709 | */ |
710 | static void o2net_ensure_shutdown(struct o2net_node *nn, |
711 | struct o2net_sock_container *sc, |
712 | int err) |
713 | { |
714 | spin_lock(&nn->nn_lock); |
715 | if (nn->nn_sc == sc) |
716 | o2net_set_nn_state(nn, NULL, 0, err); |
717 | spin_unlock(&nn->nn_lock); |
718 | } |
719 | |
720 | /* |
721 | * This work queue function performs the blocking parts of socket shutdown. A |
722 | * few paths lead here. set_nn_state will trigger this callback if it sees an |
723 | * sc detached from the nn. state_change will also trigger this callback |
724 | * directly when it sees errors. In that case we need to call set_nn_state |
725 | * ourselves as state_change couldn't get the nn_lock and call set_nn_state |
726 | * itself. |
727 | */ |
728 | static void o2net_shutdown_sc(struct work_struct *work) |
729 | { |
730 | struct o2net_sock_container *sc = |
731 | container_of(work, struct o2net_sock_container, |
732 | sc_shutdown_work); |
733 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
734 | |
735 | sclog(sc, "shutting down\n"); |
736 | |
737 | /* drop the callbacks ref and call shutdown only once */ |
738 | if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { |
739 | /* we shouldn't flush as we're in the thread, the |
740 | * races with pending sc work structs are harmless */ |
741 | del_timer_sync(&sc->sc_idle_timeout); |
742 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); |
743 | sc_put(sc); |
744 | kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); |
745 | } |
746 | |
747 | /* not fatal so failed connects before the other guy has our |
748 | * heartbeat can be retried */ |
749 | o2net_ensure_shutdown(nn, sc, 0); |
750 | sc_put(sc); |
751 | } |
752 | |
753 | /* ------------------------------------------------------------ */ |
754 | |
755 | static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, |
756 | u32 key) |
757 | { |
758 | int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); |
759 | |
760 | if (ret == 0) |
761 | ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); |
762 | |
763 | return ret; |
764 | } |
765 | |
766 | static struct o2net_msg_handler * |
767 | o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, |
768 | struct rb_node **ret_parent) |
769 | { |
770 | struct rb_node **p = &o2net_handler_tree.rb_node; |
771 | struct rb_node *parent = NULL; |
772 | struct o2net_msg_handler *nmh, *ret = NULL; |
773 | int cmp; |
774 | |
775 | while (*p) { |
776 | parent = *p; |
777 | nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); |
778 | cmp = o2net_handler_cmp(nmh, msg_type, key); |
779 | |
780 | if (cmp < 0) |
781 | p = &(*p)->rb_left; |
782 | else if (cmp > 0) |
783 | p = &(*p)->rb_right; |
784 | else { |
785 | ret = nmh; |
786 | break; |
787 | } |
788 | } |
789 | |
790 | if (ret_p != NULL) |
791 | *ret_p = p; |
792 | if (ret_parent != NULL) |
793 | *ret_parent = parent; |
794 | |
795 | return ret; |
796 | } |
797 | |
798 | static void o2net_handler_kref_release(struct kref *kref) |
799 | { |
800 | struct o2net_msg_handler *nmh; |
801 | nmh = container_of(kref, struct o2net_msg_handler, nh_kref); |
802 | |
803 | kfree(nmh); |
804 | } |
805 | |
806 | static void o2net_handler_put(struct o2net_msg_handler *nmh) |
807 | { |
808 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); |
809 | } |
810 | |
811 | /* max_len is protection for the handler func. incoming messages won't |
812 | * be given to the handler if their payload is longer than the max. */ |
813 | int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, |
814 | o2net_msg_handler_func *func, void *data, |
815 | o2net_post_msg_handler_func *post_func, |
816 | struct list_head *unreg_list) |
817 | { |
818 | struct o2net_msg_handler *nmh = NULL; |
819 | struct rb_node **p, *parent; |
820 | int ret = 0; |
821 | |
822 | if (max_len > O2NET_MAX_PAYLOAD_BYTES) { |
823 | mlog(0, "max_len for message handler out of range: %u\n", |
824 | max_len); |
825 | ret = -EINVAL; |
826 | goto out; |
827 | } |
828 | |
829 | if (!msg_type) { |
830 | mlog(0, "no message type provided: %u, %p\n", msg_type, func); |
831 | ret = -EINVAL; |
832 | goto out; |
833 | |
834 | } |
835 | if (!func) { |
836 | mlog(0, "no message handler provided: %u, %p\n", |
837 | msg_type, func); |
838 | ret = -EINVAL; |
839 | goto out; |
840 | } |
841 | |
842 | nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); |
843 | if (nmh == NULL) { |
844 | ret = -ENOMEM; |
845 | goto out; |
846 | } |
847 | |
848 | nmh->nh_func = func; |
849 | nmh->nh_func_data = data; |
850 | nmh->nh_post_func = post_func; |
851 | nmh->nh_msg_type = msg_type; |
852 | nmh->nh_max_len = max_len; |
853 | nmh->nh_key = key; |
854 | /* the tree and list get this ref.. they're both removed in |
855 | * unregister when this ref is dropped */ |
856 | kref_init(&nmh->nh_kref); |
857 | INIT_LIST_HEAD(&nmh->nh_unregister_item); |
858 | |
859 | write_lock(&o2net_handler_lock); |
860 | if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) |
861 | ret = -EEXIST; |
862 | else { |
863 | rb_link_node(&nmh->nh_node, parent, p); |
864 | rb_insert_color(&nmh->nh_node, &o2net_handler_tree); |
865 | list_add_tail(&nmh->nh_unregister_item, unreg_list); |
866 | |
867 | mlog(ML_TCP, "registered handler func %p type %u key %08x\n", |
868 | func, msg_type, key); |
869 | /* we've had some trouble with handlers seemingly vanishing. */ |
870 | mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, |
871 | &parent) == NULL, |
872 | "couldn't find handler we *just* registerd " |
873 | "for type %u key %08x\n", msg_type, key); |
874 | } |
875 | write_unlock(&o2net_handler_lock); |
876 | if (ret) |
877 | goto out; |
878 | |
879 | out: |
880 | if (ret) |
881 | kfree(nmh); |
882 | |
883 | return ret; |
884 | } |
885 | EXPORT_SYMBOL_GPL(o2net_register_handler); |
886 | |
887 | void o2net_unregister_handler_list(struct list_head *list) |
888 | { |
889 | struct o2net_msg_handler *nmh, *n; |
890 | |
891 | write_lock(&o2net_handler_lock); |
892 | list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { |
893 | mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", |
894 | nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); |
895 | rb_erase(&nmh->nh_node, &o2net_handler_tree); |
896 | list_del_init(&nmh->nh_unregister_item); |
897 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); |
898 | } |
899 | write_unlock(&o2net_handler_lock); |
900 | } |
901 | EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); |
902 | |
903 | static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) |
904 | { |
905 | struct o2net_msg_handler *nmh; |
906 | |
907 | read_lock(&o2net_handler_lock); |
908 | nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); |
909 | if (nmh) |
910 | kref_get(&nmh->nh_kref); |
911 | read_unlock(&o2net_handler_lock); |
912 | |
913 | return nmh; |
914 | } |
915 | |
916 | /* ------------------------------------------------------------ */ |
917 | |
918 | static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) |
919 | { |
920 | int ret; |
921 | mm_segment_t oldfs; |
922 | struct kvec vec = { |
923 | .iov_len = len, |
924 | .iov_base = data, |
925 | }; |
926 | struct msghdr msg = { |
927 | .msg_iovlen = 1, |
928 | .msg_iov = (struct iovec *)&vec, |
929 | .msg_flags = MSG_DONTWAIT, |
930 | }; |
931 | |
932 | oldfs = get_fs(); |
933 | set_fs(get_ds()); |
934 | ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); |
935 | set_fs(oldfs); |
936 | |
937 | return ret; |
938 | } |
939 | |
940 | static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, |
941 | size_t veclen, size_t total) |
942 | { |
943 | int ret; |
944 | mm_segment_t oldfs; |
945 | struct msghdr msg = { |
946 | .msg_iov = (struct iovec *)vec, |
947 | .msg_iovlen = veclen, |
948 | }; |
949 | |
950 | if (sock == NULL) { |
951 | ret = -EINVAL; |
952 | goto out; |
953 | } |
954 | |
955 | oldfs = get_fs(); |
956 | set_fs(get_ds()); |
957 | ret = sock_sendmsg(sock, &msg, total); |
958 | set_fs(oldfs); |
959 | if (ret != total) { |
960 | mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, |
961 | total); |
962 | if (ret >= 0) |
963 | ret = -EPIPE; /* should be smarter, I bet */ |
964 | goto out; |
965 | } |
966 | |
967 | ret = 0; |
968 | out: |
969 | if (ret < 0) |
970 | mlog(0, "returning error: %d\n", ret); |
971 | return ret; |
972 | } |
973 | |
974 | static void o2net_sendpage(struct o2net_sock_container *sc, |
975 | void *kmalloced_virt, |
976 | size_t size) |
977 | { |
978 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
979 | ssize_t ret; |
980 | |
981 | while (1) { |
982 | mutex_lock(&sc->sc_send_lock); |
983 | ret = sc->sc_sock->ops->sendpage(sc->sc_sock, |
984 | virt_to_page(kmalloced_virt), |
985 | (long)kmalloced_virt & ~PAGE_MASK, |
986 | size, MSG_DONTWAIT); |
987 | mutex_unlock(&sc->sc_send_lock); |
988 | if (ret == size) |
989 | break; |
990 | if (ret == (ssize_t)-EAGAIN) { |
991 | mlog(0, "sendpage of size %zu to " SC_NODEF_FMT |
992 | " returned EAGAIN\n", size, SC_NODEF_ARGS(sc)); |
993 | cond_resched(); |
994 | continue; |
995 | } |
996 | mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT |
997 | " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); |
998 | o2net_ensure_shutdown(nn, sc, 0); |
999 | break; |
1000 | } |
1001 | } |
1002 | |
1003 | static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) |
1004 | { |
1005 | memset(msg, 0, sizeof(struct o2net_msg)); |
1006 | msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); |
1007 | msg->data_len = cpu_to_be16(data_len); |
1008 | msg->msg_type = cpu_to_be16(msg_type); |
1009 | msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); |
1010 | msg->status = 0; |
1011 | msg->key = cpu_to_be32(key); |
1012 | } |
1013 | |
1014 | static int o2net_tx_can_proceed(struct o2net_node *nn, |
1015 | struct o2net_sock_container **sc_ret, |
1016 | int *error) |
1017 | { |
1018 | int ret = 0; |
1019 | |
1020 | spin_lock(&nn->nn_lock); |
1021 | if (nn->nn_persistent_error) { |
1022 | ret = 1; |
1023 | *sc_ret = NULL; |
1024 | *error = nn->nn_persistent_error; |
1025 | } else if (nn->nn_sc_valid) { |
1026 | kref_get(&nn->nn_sc->sc_kref); |
1027 | |
1028 | ret = 1; |
1029 | *sc_ret = nn->nn_sc; |
1030 | *error = 0; |
1031 | } |
1032 | spin_unlock(&nn->nn_lock); |
1033 | |
1034 | return ret; |
1035 | } |
1036 | |
1037 | int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, |
1038 | size_t caller_veclen, u8 target_node, int *status) |
1039 | { |
1040 | int ret = 0; |
1041 | struct o2net_msg *msg = NULL; |
1042 | size_t veclen, caller_bytes = 0; |
1043 | struct kvec *vec = NULL; |
1044 | struct o2net_sock_container *sc = NULL; |
1045 | struct o2net_node *nn = o2net_nn_from_num(target_node); |
1046 | struct o2net_status_wait nsw = { |
1047 | .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), |
1048 | }; |
1049 | struct o2net_send_tracking nst; |
1050 | |
1051 | o2net_init_nst(&nst, msg_type, key, current, target_node); |
1052 | |
1053 | if (o2net_wq == NULL) { |
1054 | mlog(0, "attempt to tx without o2netd running\n"); |
1055 | ret = -ESRCH; |
1056 | goto out; |
1057 | } |
1058 | |
1059 | if (caller_veclen == 0) { |
1060 | mlog(0, "bad kvec array length\n"); |
1061 | ret = -EINVAL; |
1062 | goto out; |
1063 | } |
1064 | |
1065 | caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); |
1066 | if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { |
1067 | mlog(0, "total payload len %zu too large\n", caller_bytes); |
1068 | ret = -EINVAL; |
1069 | goto out; |
1070 | } |
1071 | |
1072 | if (target_node == o2nm_this_node()) { |
1073 | ret = -ELOOP; |
1074 | goto out; |
1075 | } |
1076 | |
1077 | o2net_debug_add_nst(&nst); |
1078 | |
1079 | o2net_set_nst_sock_time(&nst); |
1080 | |
1081 | wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); |
1082 | if (ret) |
1083 | goto out; |
1084 | |
1085 | o2net_set_nst_sock_container(&nst, sc); |
1086 | |
1087 | veclen = caller_veclen + 1; |
1088 | vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); |
1089 | if (vec == NULL) { |
1090 | mlog(0, "failed to %zu element kvec!\n", veclen); |
1091 | ret = -ENOMEM; |
1092 | goto out; |
1093 | } |
1094 | |
1095 | msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); |
1096 | if (!msg) { |
1097 | mlog(0, "failed to allocate a o2net_msg!\n"); |
1098 | ret = -ENOMEM; |
1099 | goto out; |
1100 | } |
1101 | |
1102 | o2net_init_msg(msg, caller_bytes, msg_type, key); |
1103 | |
1104 | vec[0].iov_len = sizeof(struct o2net_msg); |
1105 | vec[0].iov_base = msg; |
1106 | memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); |
1107 | |
1108 | ret = o2net_prep_nsw(nn, &nsw); |
1109 | if (ret) |
1110 | goto out; |
1111 | |
1112 | msg->msg_num = cpu_to_be32(nsw.ns_id); |
1113 | o2net_set_nst_msg_id(&nst, nsw.ns_id); |
1114 | |
1115 | o2net_set_nst_send_time(&nst); |
1116 | |
1117 | /* finally, convert the message header to network byte-order |
1118 | * and send */ |
1119 | mutex_lock(&sc->sc_send_lock); |
1120 | ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, |
1121 | sizeof(struct o2net_msg) + caller_bytes); |
1122 | mutex_unlock(&sc->sc_send_lock); |
1123 | msglog(msg, "sending returned %d\n", ret); |
1124 | if (ret < 0) { |
1125 | mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); |
1126 | goto out; |
1127 | } |
1128 | |
1129 | /* wait on other node's handler */ |
1130 | o2net_set_nst_status_time(&nst); |
1131 | wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); |
1132 | |
1133 | o2net_update_send_stats(&nst, sc); |
1134 | |
1135 | /* Note that we avoid overwriting the callers status return |
1136 | * variable if a system error was reported on the other |
1137 | * side. Callers beware. */ |
1138 | ret = o2net_sys_err_to_errno(nsw.ns_sys_status); |
1139 | if (status && !ret) |
1140 | *status = nsw.ns_status; |
1141 | |
1142 | mlog(0, "woken, returning system status %d, user status %d\n", |
1143 | ret, nsw.ns_status); |
1144 | out: |
1145 | o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ |
1146 | if (sc) |
1147 | sc_put(sc); |
1148 | if (vec) |
1149 | kfree(vec); |
1150 | if (msg) |
1151 | kfree(msg); |
1152 | o2net_complete_nsw(nn, &nsw, 0, 0, 0); |
1153 | return ret; |
1154 | } |
1155 | EXPORT_SYMBOL_GPL(o2net_send_message_vec); |
1156 | |
1157 | int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, |
1158 | u8 target_node, int *status) |
1159 | { |
1160 | struct kvec vec = { |
1161 | .iov_base = data, |
1162 | .iov_len = len, |
1163 | }; |
1164 | return o2net_send_message_vec(msg_type, key, &vec, 1, |
1165 | target_node, status); |
1166 | } |
1167 | EXPORT_SYMBOL_GPL(o2net_send_message); |
1168 | |
1169 | static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, |
1170 | enum o2net_system_error syserr, int err) |
1171 | { |
1172 | struct kvec vec = { |
1173 | .iov_base = hdr, |
1174 | .iov_len = sizeof(struct o2net_msg), |
1175 | }; |
1176 | |
1177 | BUG_ON(syserr >= O2NET_ERR_MAX); |
1178 | |
1179 | /* leave other fields intact from the incoming message, msg_num |
1180 | * in particular */ |
1181 | hdr->sys_status = cpu_to_be32(syserr); |
1182 | hdr->status = cpu_to_be32(err); |
1183 | hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic |
1184 | hdr->data_len = 0; |
1185 | |
1186 | msglog(hdr, "about to send status magic %d\n", err); |
1187 | /* hdr has been in host byteorder this whole time */ |
1188 | return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); |
1189 | } |
1190 | |
1191 | /* this returns -errno if the header was unknown or too large, etc. |
1192 | * after this is called the buffer us reused for the next message */ |
1193 | static int o2net_process_message(struct o2net_sock_container *sc, |
1194 | struct o2net_msg *hdr) |
1195 | { |
1196 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
1197 | int ret = 0, handler_status; |
1198 | enum o2net_system_error syserr; |
1199 | struct o2net_msg_handler *nmh = NULL; |
1200 | void *ret_data = NULL; |
1201 | |
1202 | msglog(hdr, "processing message\n"); |
1203 | |
1204 | o2net_sc_postpone_idle(sc); |
1205 | |
1206 | switch(be16_to_cpu(hdr->magic)) { |
1207 | case O2NET_MSG_STATUS_MAGIC: |
1208 | /* special type for returning message status */ |
1209 | o2net_complete_nsw(nn, NULL, |
1210 | be32_to_cpu(hdr->msg_num), |
1211 | be32_to_cpu(hdr->sys_status), |
1212 | be32_to_cpu(hdr->status)); |
1213 | goto out; |
1214 | case O2NET_MSG_KEEP_REQ_MAGIC: |
1215 | o2net_sendpage(sc, o2net_keep_resp, |
1216 | sizeof(*o2net_keep_resp)); |
1217 | goto out; |
1218 | case O2NET_MSG_KEEP_RESP_MAGIC: |
1219 | goto out; |
1220 | case O2NET_MSG_MAGIC: |
1221 | break; |
1222 | default: |
1223 | msglog(hdr, "bad magic\n"); |
1224 | ret = -EINVAL; |
1225 | goto out; |
1226 | break; |
1227 | } |
1228 | |
1229 | /* find a handler for it */ |
1230 | handler_status = 0; |
1231 | nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), |
1232 | be32_to_cpu(hdr->key)); |
1233 | if (!nmh) { |
1234 | mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", |
1235 | be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); |
1236 | syserr = O2NET_ERR_NO_HNDLR; |
1237 | goto out_respond; |
1238 | } |
1239 | |
1240 | syserr = O2NET_ERR_NONE; |
1241 | |
1242 | if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) |
1243 | syserr = O2NET_ERR_OVERFLOW; |
1244 | |
1245 | if (syserr != O2NET_ERR_NONE) |
1246 | goto out_respond; |
1247 | |
1248 | o2net_set_func_start_time(sc); |
1249 | sc->sc_msg_key = be32_to_cpu(hdr->key); |
1250 | sc->sc_msg_type = be16_to_cpu(hdr->msg_type); |
1251 | handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + |
1252 | be16_to_cpu(hdr->data_len), |
1253 | nmh->nh_func_data, &ret_data); |
1254 | o2net_set_func_stop_time(sc); |
1255 | |
1256 | o2net_update_recv_stats(sc); |
1257 | |
1258 | out_respond: |
1259 | /* this destroys the hdr, so don't use it after this */ |
1260 | mutex_lock(&sc->sc_send_lock); |
1261 | ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, |
1262 | handler_status); |
1263 | mutex_unlock(&sc->sc_send_lock); |
1264 | hdr = NULL; |
1265 | mlog(0, "sending handler status %d, syserr %d returned %d\n", |
1266 | handler_status, syserr, ret); |
1267 | |
1268 | if (nmh) { |
1269 | BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); |
1270 | if (nmh->nh_post_func) |
1271 | (nmh->nh_post_func)(handler_status, nmh->nh_func_data, |
1272 | ret_data); |
1273 | } |
1274 | |
1275 | out: |
1276 | if (nmh) |
1277 | o2net_handler_put(nmh); |
1278 | return ret; |
1279 | } |
1280 | |
1281 | static int o2net_check_handshake(struct o2net_sock_container *sc) |
1282 | { |
1283 | struct o2net_handshake *hand = page_address(sc->sc_page); |
1284 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
1285 | |
1286 | if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { |
1287 | mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol " |
1288 | "version %llu but %llu is required, disconnecting\n", |
1289 | SC_NODEF_ARGS(sc), |
1290 | (unsigned long long)be64_to_cpu(hand->protocol_version), |
1291 | O2NET_PROTOCOL_VERSION); |
1292 | |
1293 | /* don't bother reconnecting if its the wrong version. */ |
1294 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1295 | return -1; |
1296 | } |
1297 | |
1298 | /* |
1299 | * Ensure timeouts are consistent with other nodes, otherwise |
1300 | * we can end up with one node thinking that the other must be down, |
1301 | * but isn't. This can ultimately cause corruption. |
1302 | */ |
1303 | if (be32_to_cpu(hand->o2net_idle_timeout_ms) != |
1304 | o2net_idle_timeout()) { |
1305 | mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of " |
1306 | "%u ms, but we use %u ms locally. disconnecting\n", |
1307 | SC_NODEF_ARGS(sc), |
1308 | be32_to_cpu(hand->o2net_idle_timeout_ms), |
1309 | o2net_idle_timeout()); |
1310 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1311 | return -1; |
1312 | } |
1313 | |
1314 | if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != |
1315 | o2net_keepalive_delay()) { |
1316 | mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of " |
1317 | "%u ms, but we use %u ms locally. disconnecting\n", |
1318 | SC_NODEF_ARGS(sc), |
1319 | be32_to_cpu(hand->o2net_keepalive_delay_ms), |
1320 | o2net_keepalive_delay()); |
1321 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1322 | return -1; |
1323 | } |
1324 | |
1325 | if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != |
1326 | O2HB_MAX_WRITE_TIMEOUT_MS) { |
1327 | mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of " |
1328 | "%u ms, but we use %u ms locally. disconnecting\n", |
1329 | SC_NODEF_ARGS(sc), |
1330 | be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), |
1331 | O2HB_MAX_WRITE_TIMEOUT_MS); |
1332 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1333 | return -1; |
1334 | } |
1335 | |
1336 | sc->sc_handshake_ok = 1; |
1337 | |
1338 | spin_lock(&nn->nn_lock); |
1339 | /* set valid and queue the idle timers only if it hasn't been |
1340 | * shut down already */ |
1341 | if (nn->nn_sc == sc) { |
1342 | o2net_sc_reset_idle_timer(sc); |
1343 | atomic_set(&nn->nn_timeout, 0); |
1344 | o2net_set_nn_state(nn, sc, 1, 0); |
1345 | } |
1346 | spin_unlock(&nn->nn_lock); |
1347 | |
1348 | /* shift everything up as though it wasn't there */ |
1349 | sc->sc_page_off -= sizeof(struct o2net_handshake); |
1350 | if (sc->sc_page_off) |
1351 | memmove(hand, hand + 1, sc->sc_page_off); |
1352 | |
1353 | return 0; |
1354 | } |
1355 | |
1356 | /* this demuxes the queued rx bytes into header or payload bits and calls |
1357 | * handlers as each full message is read off the socket. it returns -error, |
1358 | * == 0 eof, or > 0 for progress made.*/ |
1359 | static int o2net_advance_rx(struct o2net_sock_container *sc) |
1360 | { |
1361 | struct o2net_msg *hdr; |
1362 | int ret = 0; |
1363 | void *data; |
1364 | size_t datalen; |
1365 | |
1366 | sclog(sc, "receiving\n"); |
1367 | o2net_set_advance_start_time(sc); |
1368 | |
1369 | if (unlikely(sc->sc_handshake_ok == 0)) { |
1370 | if(sc->sc_page_off < sizeof(struct o2net_handshake)) { |
1371 | data = page_address(sc->sc_page) + sc->sc_page_off; |
1372 | datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; |
1373 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
1374 | if (ret > 0) |
1375 | sc->sc_page_off += ret; |
1376 | } |
1377 | |
1378 | if (sc->sc_page_off == sizeof(struct o2net_handshake)) { |
1379 | o2net_check_handshake(sc); |
1380 | if (unlikely(sc->sc_handshake_ok == 0)) |
1381 | ret = -EPROTO; |
1382 | } |
1383 | goto out; |
1384 | } |
1385 | |
1386 | /* do we need more header? */ |
1387 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { |
1388 | data = page_address(sc->sc_page) + sc->sc_page_off; |
1389 | datalen = sizeof(struct o2net_msg) - sc->sc_page_off; |
1390 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
1391 | if (ret > 0) { |
1392 | sc->sc_page_off += ret; |
1393 | /* only swab incoming here.. we can |
1394 | * only get here once as we cross from |
1395 | * being under to over */ |
1396 | if (sc->sc_page_off == sizeof(struct o2net_msg)) { |
1397 | hdr = page_address(sc->sc_page); |
1398 | if (be16_to_cpu(hdr->data_len) > |
1399 | O2NET_MAX_PAYLOAD_BYTES) |
1400 | ret = -EOVERFLOW; |
1401 | } |
1402 | } |
1403 | if (ret <= 0) |
1404 | goto out; |
1405 | } |
1406 | |
1407 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { |
1408 | /* oof, still don't have a header */ |
1409 | goto out; |
1410 | } |
1411 | |
1412 | /* this was swabbed above when we first read it */ |
1413 | hdr = page_address(sc->sc_page); |
1414 | |
1415 | msglog(hdr, "at page_off %zu\n", sc->sc_page_off); |
1416 | |
1417 | /* do we need more payload? */ |
1418 | if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { |
1419 | /* need more payload */ |
1420 | data = page_address(sc->sc_page) + sc->sc_page_off; |
1421 | datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - |
1422 | sc->sc_page_off; |
1423 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
1424 | if (ret > 0) |
1425 | sc->sc_page_off += ret; |
1426 | if (ret <= 0) |
1427 | goto out; |
1428 | } |
1429 | |
1430 | if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { |
1431 | /* we can only get here once, the first time we read |
1432 | * the payload.. so set ret to progress if the handler |
1433 | * works out. after calling this the message is toast */ |
1434 | ret = o2net_process_message(sc, hdr); |
1435 | if (ret == 0) |
1436 | ret = 1; |
1437 | sc->sc_page_off = 0; |
1438 | } |
1439 | |
1440 | out: |
1441 | sclog(sc, "ret = %d\n", ret); |
1442 | o2net_set_advance_stop_time(sc); |
1443 | return ret; |
1444 | } |
1445 | |
1446 | /* this work func is triggerd by data ready. it reads until it can read no |
1447 | * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing |
1448 | * our work the work struct will be marked and we'll be called again. */ |
1449 | static void o2net_rx_until_empty(struct work_struct *work) |
1450 | { |
1451 | struct o2net_sock_container *sc = |
1452 | container_of(work, struct o2net_sock_container, sc_rx_work); |
1453 | int ret; |
1454 | |
1455 | do { |
1456 | ret = o2net_advance_rx(sc); |
1457 | } while (ret > 0); |
1458 | |
1459 | if (ret <= 0 && ret != -EAGAIN) { |
1460 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
1461 | sclog(sc, "saw error %d, closing\n", ret); |
1462 | /* not permanent so read failed handshake can retry */ |
1463 | o2net_ensure_shutdown(nn, sc, 0); |
1464 | } |
1465 | |
1466 | sc_put(sc); |
1467 | } |
1468 | |
1469 | static int o2net_set_nodelay(struct socket *sock) |
1470 | { |
1471 | int ret, val = 1; |
1472 | mm_segment_t oldfs; |
1473 | |
1474 | oldfs = get_fs(); |
1475 | set_fs(KERNEL_DS); |
1476 | |
1477 | /* |
1478 | * Dear unsuspecting programmer, |
1479 | * |
1480 | * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level |
1481 | * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will |
1482 | * silently turn into SO_DEBUG. |
1483 | * |
1484 | * Yours, |
1485 | * Keeper of hilariously fragile interfaces. |
1486 | */ |
1487 | ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, |
1488 | (char __user *)&val, sizeof(val)); |
1489 | |
1490 | set_fs(oldfs); |
1491 | return ret; |
1492 | } |
1493 | |
1494 | static void o2net_initialize_handshake(void) |
1495 | { |
1496 | o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( |
1497 | O2HB_MAX_WRITE_TIMEOUT_MS); |
1498 | o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); |
1499 | o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( |
1500 | o2net_keepalive_delay()); |
1501 | o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( |
1502 | o2net_reconnect_delay()); |
1503 | } |
1504 | |
1505 | /* ------------------------------------------------------------ */ |
1506 | |
1507 | /* called when a connect completes and after a sock is accepted. the |
1508 | * rx path will see the response and mark the sc valid */ |
1509 | static void o2net_sc_connect_completed(struct work_struct *work) |
1510 | { |
1511 | struct o2net_sock_container *sc = |
1512 | container_of(work, struct o2net_sock_container, |
1513 | sc_connect_work); |
1514 | |
1515 | mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", |
1516 | (unsigned long long)O2NET_PROTOCOL_VERSION, |
1517 | (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); |
1518 | |
1519 | o2net_initialize_handshake(); |
1520 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1521 | sc_put(sc); |
1522 | } |
1523 | |
1524 | /* this is called as a work_struct func. */ |
1525 | static void o2net_sc_send_keep_req(struct work_struct *work) |
1526 | { |
1527 | struct o2net_sock_container *sc = |
1528 | container_of(work, struct o2net_sock_container, |
1529 | sc_keepalive_work.work); |
1530 | |
1531 | o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); |
1532 | sc_put(sc); |
1533 | } |
1534 | |
1535 | /* socket shutdown does a del_timer_sync against this as it tears down. |
1536 | * we can't start this timer until we've got to the point in sc buildup |
1537 | * where shutdown is going to be involved */ |
1538 | static void o2net_idle_timer(unsigned long data) |
1539 | { |
1540 | struct o2net_sock_container *sc = (struct o2net_sock_container *)data; |
1541 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
1542 | |
1543 | #ifdef CONFIG_DEBUG_FS |
1544 | ktime_t now = ktime_get(); |
1545 | #endif |
1546 | |
1547 | printk(KERN_NOTICE "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u " |
1548 | "seconds, shutting it down.\n", SC_NODEF_ARGS(sc), |
1549 | o2net_idle_timeout() / 1000, |
1550 | o2net_idle_timeout() % 1000); |
1551 | |
1552 | #ifdef CONFIG_DEBUG_FS |
1553 | mlog(ML_NOTICE, "Here are some times that might help debug the " |
1554 | "situation: (Timer: %lld, Now %lld, DataReady %lld, Advance %lld-%lld, " |
1555 | "Key 0x%08x, Func %u, FuncTime %lld-%lld)\n", |
1556 | (long long)ktime_to_us(sc->sc_tv_timer), (long long)ktime_to_us(now), |
1557 | (long long)ktime_to_us(sc->sc_tv_data_ready), |
1558 | (long long)ktime_to_us(sc->sc_tv_advance_start), |
1559 | (long long)ktime_to_us(sc->sc_tv_advance_stop), |
1560 | sc->sc_msg_key, sc->sc_msg_type, |
1561 | (long long)ktime_to_us(sc->sc_tv_func_start), |
1562 | (long long)ktime_to_us(sc->sc_tv_func_stop)); |
1563 | #endif |
1564 | |
1565 | /* |
1566 | * Initialize the nn_timeout so that the next connection attempt |
1567 | * will continue in o2net_start_connect. |
1568 | */ |
1569 | atomic_set(&nn->nn_timeout, 1); |
1570 | |
1571 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
1572 | } |
1573 | |
1574 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) |
1575 | { |
1576 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); |
1577 | o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, |
1578 | msecs_to_jiffies(o2net_keepalive_delay())); |
1579 | o2net_set_sock_timer(sc); |
1580 | mod_timer(&sc->sc_idle_timeout, |
1581 | jiffies + msecs_to_jiffies(o2net_idle_timeout())); |
1582 | } |
1583 | |
1584 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) |
1585 | { |
1586 | /* Only push out an existing timer */ |
1587 | if (timer_pending(&sc->sc_idle_timeout)) |
1588 | o2net_sc_reset_idle_timer(sc); |
1589 | } |
1590 | |
1591 | /* this work func is kicked whenever a path sets the nn state which doesn't |
1592 | * have valid set. This includes seeing hb come up, losing a connection, |
1593 | * having a connect attempt fail, etc. This centralizes the logic which decides |
1594 | * if a connect attempt should be made or if we should give up and all future |
1595 | * transmit attempts should fail */ |
1596 | static void o2net_start_connect(struct work_struct *work) |
1597 | { |
1598 | struct o2net_node *nn = |
1599 | container_of(work, struct o2net_node, nn_connect_work.work); |
1600 | struct o2net_sock_container *sc = NULL; |
1601 | struct o2nm_node *node = NULL, *mynode = NULL; |
1602 | struct socket *sock = NULL; |
1603 | struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; |
1604 | int ret = 0, stop; |
1605 | unsigned int timeout; |
1606 | |
1607 | /* if we're greater we initiate tx, otherwise we accept */ |
1608 | if (o2nm_this_node() <= o2net_num_from_nn(nn)) |
1609 | goto out; |
1610 | |
1611 | /* watch for racing with tearing a node down */ |
1612 | node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); |
1613 | if (node == NULL) { |
1614 | ret = 0; |
1615 | goto out; |
1616 | } |
1617 | |
1618 | mynode = o2nm_get_node_by_num(o2nm_this_node()); |
1619 | if (mynode == NULL) { |
1620 | ret = 0; |
1621 | goto out; |
1622 | } |
1623 | |
1624 | spin_lock(&nn->nn_lock); |
1625 | /* |
1626 | * see if we already have one pending or have given up. |
1627 | * For nn_timeout, it is set when we close the connection |
1628 | * because of the idle time out. So it means that we have |
1629 | * at least connected to that node successfully once, |
1630 | * now try to connect to it again. |
1631 | */ |
1632 | timeout = atomic_read(&nn->nn_timeout); |
1633 | stop = (nn->nn_sc || |
1634 | (nn->nn_persistent_error && |
1635 | (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); |
1636 | spin_unlock(&nn->nn_lock); |
1637 | if (stop) |
1638 | goto out; |
1639 | |
1640 | nn->nn_last_connect_attempt = jiffies; |
1641 | |
1642 | sc = sc_alloc(node); |
1643 | if (sc == NULL) { |
1644 | mlog(0, "couldn't allocate sc\n"); |
1645 | ret = -ENOMEM; |
1646 | goto out; |
1647 | } |
1648 | |
1649 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
1650 | if (ret < 0) { |
1651 | mlog(0, "can't create socket: %d\n", ret); |
1652 | goto out; |
1653 | } |
1654 | sc->sc_sock = sock; /* freed by sc_kref_release */ |
1655 | |
1656 | sock->sk->sk_allocation = GFP_ATOMIC; |
1657 | |
1658 | myaddr.sin_family = AF_INET; |
1659 | myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; |
1660 | myaddr.sin_port = htons(0); /* any port */ |
1661 | |
1662 | ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, |
1663 | sizeof(myaddr)); |
1664 | if (ret) { |
1665 | mlog(ML_ERROR, "bind failed with %d at address %pI4\n", |
1666 | ret, &mynode->nd_ipv4_address); |
1667 | goto out; |
1668 | } |
1669 | |
1670 | ret = o2net_set_nodelay(sc->sc_sock); |
1671 | if (ret) { |
1672 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); |
1673 | goto out; |
1674 | } |
1675 | |
1676 | o2net_register_callbacks(sc->sc_sock->sk, sc); |
1677 | |
1678 | spin_lock(&nn->nn_lock); |
1679 | /* handshake completion will set nn->nn_sc_valid */ |
1680 | o2net_set_nn_state(nn, sc, 0, 0); |
1681 | spin_unlock(&nn->nn_lock); |
1682 | |
1683 | remoteaddr.sin_family = AF_INET; |
1684 | remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; |
1685 | remoteaddr.sin_port = node->nd_ipv4_port; |
1686 | |
1687 | ret = sc->sc_sock->ops->connect(sc->sc_sock, |
1688 | (struct sockaddr *)&remoteaddr, |
1689 | sizeof(remoteaddr), |
1690 | O_NONBLOCK); |
1691 | if (ret == -EINPROGRESS) |
1692 | ret = 0; |
1693 | |
1694 | out: |
1695 | if (ret) { |
1696 | mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed " |
1697 | "with errno %d\n", SC_NODEF_ARGS(sc), ret); |
1698 | /* 0 err so that another will be queued and attempted |
1699 | * from set_nn_state */ |
1700 | if (sc) |
1701 | o2net_ensure_shutdown(nn, sc, 0); |
1702 | } |
1703 | if (sc) |
1704 | sc_put(sc); |
1705 | if (node) |
1706 | o2nm_node_put(node); |
1707 | if (mynode) |
1708 | o2nm_node_put(mynode); |
1709 | |
1710 | return; |
1711 | } |
1712 | |
1713 | static void o2net_connect_expired(struct work_struct *work) |
1714 | { |
1715 | struct o2net_node *nn = |
1716 | container_of(work, struct o2net_node, nn_connect_expired.work); |
1717 | |
1718 | spin_lock(&nn->nn_lock); |
1719 | if (!nn->nn_sc_valid) { |
1720 | mlog(ML_ERROR, "no connection established with node %u after " |
1721 | "%u.%u seconds, giving up and returning errors.\n", |
1722 | o2net_num_from_nn(nn), |
1723 | o2net_idle_timeout() / 1000, |
1724 | o2net_idle_timeout() % 1000); |
1725 | |
1726 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
1727 | } |
1728 | spin_unlock(&nn->nn_lock); |
1729 | } |
1730 | |
1731 | static void o2net_still_up(struct work_struct *work) |
1732 | { |
1733 | struct o2net_node *nn = |
1734 | container_of(work, struct o2net_node, nn_still_up.work); |
1735 | |
1736 | o2quo_hb_still_up(o2net_num_from_nn(nn)); |
1737 | } |
1738 | |
1739 | /* ------------------------------------------------------------ */ |
1740 | |
1741 | void o2net_disconnect_node(struct o2nm_node *node) |
1742 | { |
1743 | struct o2net_node *nn = o2net_nn_from_num(node->nd_num); |
1744 | |
1745 | /* don't reconnect until it's heartbeating again */ |
1746 | spin_lock(&nn->nn_lock); |
1747 | atomic_set(&nn->nn_timeout, 0); |
1748 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
1749 | spin_unlock(&nn->nn_lock); |
1750 | |
1751 | if (o2net_wq) { |
1752 | cancel_delayed_work(&nn->nn_connect_expired); |
1753 | cancel_delayed_work(&nn->nn_connect_work); |
1754 | cancel_delayed_work(&nn->nn_still_up); |
1755 | flush_workqueue(o2net_wq); |
1756 | } |
1757 | } |
1758 | |
1759 | static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, |
1760 | void *data) |
1761 | { |
1762 | o2quo_hb_down(node_num); |
1763 | |
1764 | if (!node) |
1765 | return; |
1766 | |
1767 | if (node_num != o2nm_this_node()) |
1768 | o2net_disconnect_node(node); |
1769 | |
1770 | BUG_ON(atomic_read(&o2net_connected_peers) < 0); |
1771 | } |
1772 | |
1773 | static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, |
1774 | void *data) |
1775 | { |
1776 | struct o2net_node *nn = o2net_nn_from_num(node_num); |
1777 | |
1778 | o2quo_hb_up(node_num); |
1779 | |
1780 | BUG_ON(!node); |
1781 | |
1782 | /* ensure an immediate connect attempt */ |
1783 | nn->nn_last_connect_attempt = jiffies - |
1784 | (msecs_to_jiffies(o2net_reconnect_delay()) + 1); |
1785 | |
1786 | if (node_num != o2nm_this_node()) { |
1787 | /* believe it or not, accept and node hearbeating testing |
1788 | * can succeed for this node before we got here.. so |
1789 | * only use set_nn_state to clear the persistent error |
1790 | * if that hasn't already happened */ |
1791 | spin_lock(&nn->nn_lock); |
1792 | atomic_set(&nn->nn_timeout, 0); |
1793 | if (nn->nn_persistent_error) |
1794 | o2net_set_nn_state(nn, NULL, 0, 0); |
1795 | spin_unlock(&nn->nn_lock); |
1796 | } |
1797 | } |
1798 | |
1799 | void o2net_unregister_hb_callbacks(void) |
1800 | { |
1801 | o2hb_unregister_callback(NULL, &o2net_hb_up); |
1802 | o2hb_unregister_callback(NULL, &o2net_hb_down); |
1803 | } |
1804 | |
1805 | int o2net_register_hb_callbacks(void) |
1806 | { |
1807 | int ret; |
1808 | |
1809 | o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, |
1810 | o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); |
1811 | o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, |
1812 | o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); |
1813 | |
1814 | ret = o2hb_register_callback(NULL, &o2net_hb_up); |
1815 | if (ret == 0) |
1816 | ret = o2hb_register_callback(NULL, &o2net_hb_down); |
1817 | |
1818 | if (ret) |
1819 | o2net_unregister_hb_callbacks(); |
1820 | |
1821 | return ret; |
1822 | } |
1823 | |
1824 | /* ------------------------------------------------------------ */ |
1825 | |
1826 | static int o2net_accept_one(struct socket *sock) |
1827 | { |
1828 | int ret, slen; |
1829 | struct sockaddr_in sin; |
1830 | struct socket *new_sock = NULL; |
1831 | struct o2nm_node *node = NULL; |
1832 | struct o2nm_node *local_node = NULL; |
1833 | struct o2net_sock_container *sc = NULL; |
1834 | struct o2net_node *nn; |
1835 | |
1836 | BUG_ON(sock == NULL); |
1837 | ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, |
1838 | sock->sk->sk_protocol, &new_sock); |
1839 | if (ret) |
1840 | goto out; |
1841 | |
1842 | new_sock->type = sock->type; |
1843 | new_sock->ops = sock->ops; |
1844 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); |
1845 | if (ret < 0) |
1846 | goto out; |
1847 | |
1848 | new_sock->sk->sk_allocation = GFP_ATOMIC; |
1849 | |
1850 | ret = o2net_set_nodelay(new_sock); |
1851 | if (ret) { |
1852 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); |
1853 | goto out; |
1854 | } |
1855 | |
1856 | slen = sizeof(sin); |
1857 | ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, |
1858 | &slen, 1); |
1859 | if (ret < 0) |
1860 | goto out; |
1861 | |
1862 | node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); |
1863 | if (node == NULL) { |
1864 | mlog(ML_NOTICE, "attempt to connect from unknown node at %pI4:%d\n", |
1865 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); |
1866 | ret = -EINVAL; |
1867 | goto out; |
1868 | } |
1869 | |
1870 | if (o2nm_this_node() >= node->nd_num) { |
1871 | local_node = o2nm_get_node_by_num(o2nm_this_node()); |
1872 | mlog(ML_NOTICE, "unexpected connect attempt seen at node '%s' (" |
1873 | "%u, %pI4:%d) from node '%s' (%u, %pI4:%d)\n", |
1874 | local_node->nd_name, local_node->nd_num, |
1875 | &(local_node->nd_ipv4_address), |
1876 | ntohs(local_node->nd_ipv4_port), |
1877 | node->nd_name, node->nd_num, &sin.sin_addr.s_addr, |
1878 | ntohs(sin.sin_port)); |
1879 | ret = -EINVAL; |
1880 | goto out; |
1881 | } |
1882 | |
1883 | /* this happens all the time when the other node sees our heartbeat |
1884 | * and tries to connect before we see their heartbeat */ |
1885 | if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { |
1886 | mlog(ML_CONN, "attempt to connect from node '%s' at " |
1887 | "%pI4:%d but it isn't heartbeating\n", |
1888 | node->nd_name, &sin.sin_addr.s_addr, |
1889 | ntohs(sin.sin_port)); |
1890 | ret = -EINVAL; |
1891 | goto out; |
1892 | } |
1893 | |
1894 | nn = o2net_nn_from_num(node->nd_num); |
1895 | |
1896 | spin_lock(&nn->nn_lock); |
1897 | if (nn->nn_sc) |
1898 | ret = -EBUSY; |
1899 | else |
1900 | ret = 0; |
1901 | spin_unlock(&nn->nn_lock); |
1902 | if (ret) { |
1903 | mlog(ML_NOTICE, "attempt to connect from node '%s' at " |
1904 | "%pI4:%d but it already has an open connection\n", |
1905 | node->nd_name, &sin.sin_addr.s_addr, |
1906 | ntohs(sin.sin_port)); |
1907 | goto out; |
1908 | } |
1909 | |
1910 | sc = sc_alloc(node); |
1911 | if (sc == NULL) { |
1912 | ret = -ENOMEM; |
1913 | goto out; |
1914 | } |
1915 | |
1916 | sc->sc_sock = new_sock; |
1917 | new_sock = NULL; |
1918 | |
1919 | spin_lock(&nn->nn_lock); |
1920 | atomic_set(&nn->nn_timeout, 0); |
1921 | o2net_set_nn_state(nn, sc, 0, 0); |
1922 | spin_unlock(&nn->nn_lock); |
1923 | |
1924 | o2net_register_callbacks(sc->sc_sock->sk, sc); |
1925 | o2net_sc_queue_work(sc, &sc->sc_rx_work); |
1926 | |
1927 | o2net_initialize_handshake(); |
1928 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1929 | |
1930 | out: |
1931 | if (new_sock) |
1932 | sock_release(new_sock); |
1933 | if (node) |
1934 | o2nm_node_put(node); |
1935 | if (local_node) |
1936 | o2nm_node_put(local_node); |
1937 | if (sc) |
1938 | sc_put(sc); |
1939 | return ret; |
1940 | } |
1941 | |
1942 | static void o2net_accept_many(struct work_struct *work) |
1943 | { |
1944 | struct socket *sock = o2net_listen_sock; |
1945 | while (o2net_accept_one(sock) == 0) |
1946 | cond_resched(); |
1947 | } |
1948 | |
1949 | static void o2net_listen_data_ready(struct sock *sk, int bytes) |
1950 | { |
1951 | void (*ready)(struct sock *sk, int bytes); |
1952 | |
1953 | read_lock(&sk->sk_callback_lock); |
1954 | ready = sk->sk_user_data; |
1955 | if (ready == NULL) { /* check for teardown race */ |
1956 | ready = sk->sk_data_ready; |
1957 | goto out; |
1958 | } |
1959 | |
1960 | /* ->sk_data_ready is also called for a newly established child socket |
1961 | * before it has been accepted and the acceptor has set up their |
1962 | * data_ready.. we only want to queue listen work for our listening |
1963 | * socket */ |
1964 | if (sk->sk_state == TCP_LISTEN) { |
1965 | mlog(ML_TCP, "bytes: %d\n", bytes); |
1966 | queue_work(o2net_wq, &o2net_listen_work); |
1967 | } |
1968 | |
1969 | out: |
1970 | read_unlock(&sk->sk_callback_lock); |
1971 | ready(sk, bytes); |
1972 | } |
1973 | |
1974 | static int o2net_open_listening_sock(__be32 addr, __be16 port) |
1975 | { |
1976 | struct socket *sock = NULL; |
1977 | int ret; |
1978 | struct sockaddr_in sin = { |
1979 | .sin_family = PF_INET, |
1980 | .sin_addr = { .s_addr = addr }, |
1981 | .sin_port = port, |
1982 | }; |
1983 | |
1984 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
1985 | if (ret < 0) { |
1986 | mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret); |
1987 | goto out; |
1988 | } |
1989 | |
1990 | sock->sk->sk_allocation = GFP_ATOMIC; |
1991 | |
1992 | write_lock_bh(&sock->sk->sk_callback_lock); |
1993 | sock->sk->sk_user_data = sock->sk->sk_data_ready; |
1994 | sock->sk->sk_data_ready = o2net_listen_data_ready; |
1995 | write_unlock_bh(&sock->sk->sk_callback_lock); |
1996 | |
1997 | o2net_listen_sock = sock; |
1998 | INIT_WORK(&o2net_listen_work, o2net_accept_many); |
1999 | |
2000 | sock->sk->sk_reuse = 1; |
2001 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); |
2002 | if (ret < 0) { |
2003 | mlog(ML_ERROR, "unable to bind socket at %pI4:%u, " |
2004 | "ret=%d\n", &addr, ntohs(port), ret); |
2005 | goto out; |
2006 | } |
2007 | |
2008 | ret = sock->ops->listen(sock, 64); |
2009 | if (ret < 0) { |
2010 | mlog(ML_ERROR, "unable to listen on %pI4:%u, ret=%d\n", |
2011 | &addr, ntohs(port), ret); |
2012 | } |
2013 | |
2014 | out: |
2015 | if (ret) { |
2016 | o2net_listen_sock = NULL; |
2017 | if (sock) |
2018 | sock_release(sock); |
2019 | } |
2020 | return ret; |
2021 | } |
2022 | |
2023 | /* |
2024 | * called from node manager when we should bring up our network listening |
2025 | * socket. node manager handles all the serialization to only call this |
2026 | * once and to match it with o2net_stop_listening(). note, |
2027 | * o2nm_this_node() doesn't work yet as we're being called while it |
2028 | * is being set up. |
2029 | */ |
2030 | int o2net_start_listening(struct o2nm_node *node) |
2031 | { |
2032 | int ret = 0; |
2033 | |
2034 | BUG_ON(o2net_wq != NULL); |
2035 | BUG_ON(o2net_listen_sock != NULL); |
2036 | |
2037 | mlog(ML_KTHREAD, "starting o2net thread...\n"); |
2038 | o2net_wq = create_singlethread_workqueue("o2net"); |
2039 | if (o2net_wq == NULL) { |
2040 | mlog(ML_ERROR, "unable to launch o2net thread\n"); |
2041 | return -ENOMEM; /* ? */ |
2042 | } |
2043 | |
2044 | ret = o2net_open_listening_sock(node->nd_ipv4_address, |
2045 | node->nd_ipv4_port); |
2046 | if (ret) { |
2047 | destroy_workqueue(o2net_wq); |
2048 | o2net_wq = NULL; |
2049 | } else |
2050 | o2quo_conn_up(node->nd_num); |
2051 | |
2052 | return ret; |
2053 | } |
2054 | |
2055 | /* again, o2nm_this_node() doesn't work here as we're involved in |
2056 | * tearing it down */ |
2057 | void o2net_stop_listening(struct o2nm_node *node) |
2058 | { |
2059 | struct socket *sock = o2net_listen_sock; |
2060 | size_t i; |
2061 | |
2062 | BUG_ON(o2net_wq == NULL); |
2063 | BUG_ON(o2net_listen_sock == NULL); |
2064 | |
2065 | /* stop the listening socket from generating work */ |
2066 | write_lock_bh(&sock->sk->sk_callback_lock); |
2067 | sock->sk->sk_data_ready = sock->sk->sk_user_data; |
2068 | sock->sk->sk_user_data = NULL; |
2069 | write_unlock_bh(&sock->sk->sk_callback_lock); |
2070 | |
2071 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { |
2072 | struct o2nm_node *node = o2nm_get_node_by_num(i); |
2073 | if (node) { |
2074 | o2net_disconnect_node(node); |
2075 | o2nm_node_put(node); |
2076 | } |
2077 | } |
2078 | |
2079 | /* finish all work and tear down the work queue */ |
2080 | mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); |
2081 | destroy_workqueue(o2net_wq); |
2082 | o2net_wq = NULL; |
2083 | |
2084 | sock_release(o2net_listen_sock); |
2085 | o2net_listen_sock = NULL; |
2086 | |
2087 | o2quo_conn_err(node->nd_num); |
2088 | } |
2089 | |
2090 | /* ------------------------------------------------------------ */ |
2091 | |
2092 | int o2net_init(void) |
2093 | { |
2094 | unsigned long i; |
2095 | |
2096 | o2quo_init(); |
2097 | |
2098 | if (o2net_debugfs_init()) |
2099 | return -ENOMEM; |
2100 | |
2101 | o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); |
2102 | o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); |
2103 | o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); |
2104 | if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) { |
2105 | kfree(o2net_hand); |
2106 | kfree(o2net_keep_req); |
2107 | kfree(o2net_keep_resp); |
2108 | return -ENOMEM; |
2109 | } |
2110 | |
2111 | o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); |
2112 | o2net_hand->connector_id = cpu_to_be64(1); |
2113 | |
2114 | o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); |
2115 | o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); |
2116 | |
2117 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { |
2118 | struct o2net_node *nn = o2net_nn_from_num(i); |
2119 | |
2120 | atomic_set(&nn->nn_timeout, 0); |
2121 | spin_lock_init(&nn->nn_lock); |
2122 | INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); |
2123 | INIT_DELAYED_WORK(&nn->nn_connect_expired, |
2124 | o2net_connect_expired); |
2125 | INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); |
2126 | /* until we see hb from a node we'll return einval */ |
2127 | nn->nn_persistent_error = -ENOTCONN; |
2128 | init_waitqueue_head(&nn->nn_sc_wq); |
2129 | idr_init(&nn->nn_status_idr); |
2130 | INIT_LIST_HEAD(&nn->nn_status_list); |
2131 | } |
2132 | |
2133 | return 0; |
2134 | } |
2135 | |
2136 | void o2net_exit(void) |
2137 | { |
2138 | o2quo_exit(); |
2139 | kfree(o2net_hand); |
2140 | kfree(o2net_keep_req); |
2141 | kfree(o2net_keep_resp); |
2142 | o2net_debugfs_exit(); |
2143 | } |
2144 |
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javiroman/ks7010
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9