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98211489 ZB |
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> | |
91cf45f0 | 61 | #include <linux/net.h> |
98211489 ZB |
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 | ||
03affdef | 75 | #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" |
98211489 | 76 | #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ |
03affdef | 77 | &sc->sc_node->nd_ipv4_address, \ |
98211489 ZB |
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 | ||
34af946a | 104 | static DEFINE_RWLOCK(o2net_handler_lock); |
98211489 ZB |
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 :/ */ | |
c4028958 DH |
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); | |
98211489 | 139 | static void o2net_listen_data_ready(struct sock *sk, int bytes); |
c4028958 | 140 | static void o2net_sc_send_keep_req(struct work_struct *work); |
98211489 ZB |
141 | static void o2net_idle_timer(unsigned long data); |
142 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); | |
b5dd8030 JM |
143 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); |
144 | ||
2309e9e0 | 145 | #ifdef CONFIG_DEBUG_FS |
18496e80 AB |
146 | static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, |
147 | u32 msgkey, struct task_struct *task, u8 node) | |
0f475b2a | 148 | { |
2309e9e0 SM |
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; | |
2309e9e0 SM |
154 | } |
155 | ||
18496e80 | 156 | static void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) |
2309e9e0 | 157 | { |
2309e9e0 | 158 | do_gettimeofday(&nst->st_sock_time); |
2309e9e0 SM |
159 | } |
160 | ||
18496e80 | 161 | static void o2net_set_nst_send_time(struct o2net_send_tracking *nst) |
2309e9e0 | 162 | { |
2309e9e0 | 163 | do_gettimeofday(&nst->st_send_time); |
2309e9e0 SM |
164 | } |
165 | ||
18496e80 | 166 | static void o2net_set_nst_status_time(struct o2net_send_tracking *nst) |
2309e9e0 | 167 | { |
2309e9e0 | 168 | do_gettimeofday(&nst->st_status_time); |
2309e9e0 SM |
169 | } |
170 | ||
18496e80 | 171 | static void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, |
2309e9e0 SM |
172 | struct o2net_sock_container *sc) |
173 | { | |
2309e9e0 | 174 | nst->st_sc = sc; |
2309e9e0 SM |
175 | } |
176 | ||
18496e80 | 177 | static void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, u32 msg_id) |
2309e9e0 | 178 | { |
2309e9e0 | 179 | nst->st_id = msg_id; |
2309e9e0 | 180 | } |
18496e80 AB |
181 | |
182 | #else /* CONFIG_DEBUG_FS */ | |
183 | ||
184 | static inline void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, | |
185 | u32 msgkey, struct task_struct *task, u8 node) | |
186 | { | |
187 | } | |
188 | ||
189 | static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) | |
190 | { | |
191 | } | |
192 | ||
193 | static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) | |
194 | { | |
195 | } | |
196 | ||
197 | static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) | |
198 | { | |
199 | } | |
200 | ||
201 | static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, | |
202 | struct o2net_sock_container *sc) | |
203 | { | |
204 | } | |
205 | ||
206 | static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, | |
207 | u32 msg_id) | |
208 | { | |
209 | } | |
210 | ||
0f475b2a | 211 | #endif /* CONFIG_DEBUG_FS */ |
2309e9e0 | 212 | |
409753bf | 213 | static inline int o2net_reconnect_delay(void) |
b5dd8030 JM |
214 | { |
215 | return o2nm_single_cluster->cl_reconnect_delay_ms; | |
216 | } | |
217 | ||
409753bf | 218 | static inline int o2net_keepalive_delay(void) |
b5dd8030 JM |
219 | { |
220 | return o2nm_single_cluster->cl_keepalive_delay_ms; | |
221 | } | |
222 | ||
409753bf | 223 | static inline int o2net_idle_timeout(void) |
b5dd8030 JM |
224 | { |
225 | return o2nm_single_cluster->cl_idle_timeout_ms; | |
226 | } | |
98211489 ZB |
227 | |
228 | static inline int o2net_sys_err_to_errno(enum o2net_system_error err) | |
229 | { | |
230 | int trans; | |
231 | BUG_ON(err >= O2NET_ERR_MAX); | |
232 | trans = o2net_sys_err_translations[err]; | |
233 | ||
234 | /* Just in case we mess up the translation table above */ | |
235 | BUG_ON(err != O2NET_ERR_NONE && trans == 0); | |
236 | return trans; | |
237 | } | |
238 | ||
239 | static struct o2net_node * o2net_nn_from_num(u8 node_num) | |
240 | { | |
241 | BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); | |
242 | return &o2net_nodes[node_num]; | |
243 | } | |
244 | ||
245 | static u8 o2net_num_from_nn(struct o2net_node *nn) | |
246 | { | |
247 | BUG_ON(nn == NULL); | |
248 | return nn - o2net_nodes; | |
249 | } | |
250 | ||
251 | /* ------------------------------------------------------------ */ | |
252 | ||
253 | static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) | |
254 | { | |
255 | int ret = 0; | |
256 | ||
257 | do { | |
258 | if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { | |
259 | ret = -EAGAIN; | |
260 | break; | |
261 | } | |
262 | spin_lock(&nn->nn_lock); | |
263 | ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); | |
264 | if (ret == 0) | |
265 | list_add_tail(&nsw->ns_node_item, | |
266 | &nn->nn_status_list); | |
267 | spin_unlock(&nn->nn_lock); | |
268 | } while (ret == -EAGAIN); | |
269 | ||
270 | if (ret == 0) { | |
271 | init_waitqueue_head(&nsw->ns_wq); | |
272 | nsw->ns_sys_status = O2NET_ERR_NONE; | |
273 | nsw->ns_status = 0; | |
274 | } | |
275 | ||
276 | return ret; | |
277 | } | |
278 | ||
279 | static void o2net_complete_nsw_locked(struct o2net_node *nn, | |
280 | struct o2net_status_wait *nsw, | |
281 | enum o2net_system_error sys_status, | |
282 | s32 status) | |
283 | { | |
284 | assert_spin_locked(&nn->nn_lock); | |
285 | ||
286 | if (!list_empty(&nsw->ns_node_item)) { | |
287 | list_del_init(&nsw->ns_node_item); | |
288 | nsw->ns_sys_status = sys_status; | |
289 | nsw->ns_status = status; | |
290 | idr_remove(&nn->nn_status_idr, nsw->ns_id); | |
291 | wake_up(&nsw->ns_wq); | |
292 | } | |
293 | } | |
294 | ||
295 | static void o2net_complete_nsw(struct o2net_node *nn, | |
296 | struct o2net_status_wait *nsw, | |
297 | u64 id, enum o2net_system_error sys_status, | |
298 | s32 status) | |
299 | { | |
300 | spin_lock(&nn->nn_lock); | |
301 | if (nsw == NULL) { | |
302 | if (id > INT_MAX) | |
303 | goto out; | |
304 | ||
305 | nsw = idr_find(&nn->nn_status_idr, id); | |
306 | if (nsw == NULL) | |
307 | goto out; | |
308 | } | |
309 | ||
310 | o2net_complete_nsw_locked(nn, nsw, sys_status, status); | |
311 | ||
312 | out: | |
313 | spin_unlock(&nn->nn_lock); | |
314 | return; | |
315 | } | |
316 | ||
317 | static void o2net_complete_nodes_nsw(struct o2net_node *nn) | |
318 | { | |
800deef3 | 319 | struct o2net_status_wait *nsw, *tmp; |
98211489 | 320 | unsigned int num_kills = 0; |
98211489 ZB |
321 | |
322 | assert_spin_locked(&nn->nn_lock); | |
323 | ||
800deef3 | 324 | list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { |
98211489 ZB |
325 | o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); |
326 | num_kills++; | |
327 | } | |
328 | ||
329 | mlog(0, "completed %d messages for node %u\n", num_kills, | |
330 | o2net_num_from_nn(nn)); | |
331 | } | |
332 | ||
333 | static int o2net_nsw_completed(struct o2net_node *nn, | |
334 | struct o2net_status_wait *nsw) | |
335 | { | |
336 | int completed; | |
337 | spin_lock(&nn->nn_lock); | |
338 | completed = list_empty(&nsw->ns_node_item); | |
339 | spin_unlock(&nn->nn_lock); | |
340 | return completed; | |
341 | } | |
342 | ||
343 | /* ------------------------------------------------------------ */ | |
344 | ||
345 | static void sc_kref_release(struct kref *kref) | |
346 | { | |
347 | struct o2net_sock_container *sc = container_of(kref, | |
348 | struct o2net_sock_container, sc_kref); | |
b5dd8030 JM |
349 | BUG_ON(timer_pending(&sc->sc_idle_timeout)); |
350 | ||
98211489 ZB |
351 | sclog(sc, "releasing\n"); |
352 | ||
353 | if (sc->sc_sock) { | |
354 | sock_release(sc->sc_sock); | |
355 | sc->sc_sock = NULL; | |
356 | } | |
357 | ||
358 | o2nm_node_put(sc->sc_node); | |
359 | sc->sc_node = NULL; | |
360 | ||
2309e9e0 | 361 | o2net_debug_del_sc(sc); |
98211489 ZB |
362 | kfree(sc); |
363 | } | |
364 | ||
365 | static void sc_put(struct o2net_sock_container *sc) | |
366 | { | |
367 | sclog(sc, "put\n"); | |
368 | kref_put(&sc->sc_kref, sc_kref_release); | |
369 | } | |
370 | static void sc_get(struct o2net_sock_container *sc) | |
371 | { | |
372 | sclog(sc, "get\n"); | |
373 | kref_get(&sc->sc_kref); | |
374 | } | |
375 | static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) | |
376 | { | |
377 | struct o2net_sock_container *sc, *ret = NULL; | |
378 | struct page *page = NULL; | |
379 | ||
380 | page = alloc_page(GFP_NOFS); | |
cd861280 | 381 | sc = kzalloc(sizeof(*sc), GFP_NOFS); |
98211489 ZB |
382 | if (sc == NULL || page == NULL) |
383 | goto out; | |
384 | ||
385 | kref_init(&sc->sc_kref); | |
386 | o2nm_node_get(node); | |
387 | sc->sc_node = node; | |
388 | ||
c4028958 DH |
389 | INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); |
390 | INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); | |
391 | INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); | |
392 | INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); | |
98211489 ZB |
393 | |
394 | init_timer(&sc->sc_idle_timeout); | |
395 | sc->sc_idle_timeout.function = o2net_idle_timer; | |
396 | sc->sc_idle_timeout.data = (unsigned long)sc; | |
397 | ||
398 | sclog(sc, "alloced\n"); | |
399 | ||
400 | ret = sc; | |
401 | sc->sc_page = page; | |
2309e9e0 | 402 | o2net_debug_add_sc(sc); |
98211489 ZB |
403 | sc = NULL; |
404 | page = NULL; | |
405 | ||
406 | out: | |
407 | if (page) | |
408 | __free_page(page); | |
409 | kfree(sc); | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | /* ------------------------------------------------------------ */ | |
415 | ||
416 | static void o2net_sc_queue_work(struct o2net_sock_container *sc, | |
417 | struct work_struct *work) | |
418 | { | |
419 | sc_get(sc); | |
420 | if (!queue_work(o2net_wq, work)) | |
421 | sc_put(sc); | |
422 | } | |
423 | static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, | |
c4028958 | 424 | struct delayed_work *work, |
98211489 ZB |
425 | int delay) |
426 | { | |
427 | sc_get(sc); | |
428 | if (!queue_delayed_work(o2net_wq, work, delay)) | |
429 | sc_put(sc); | |
430 | } | |
431 | static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, | |
c4028958 | 432 | struct delayed_work *work) |
98211489 ZB |
433 | { |
434 | if (cancel_delayed_work(work)) | |
435 | sc_put(sc); | |
436 | } | |
437 | ||
828ae6af AB |
438 | static atomic_t o2net_connected_peers = ATOMIC_INIT(0); |
439 | ||
440 | int o2net_num_connected_peers(void) | |
441 | { | |
442 | return atomic_read(&o2net_connected_peers); | |
443 | } | |
444 | ||
98211489 ZB |
445 | static void o2net_set_nn_state(struct o2net_node *nn, |
446 | struct o2net_sock_container *sc, | |
447 | unsigned valid, int err) | |
448 | { | |
449 | int was_valid = nn->nn_sc_valid; | |
450 | int was_err = nn->nn_persistent_error; | |
451 | struct o2net_sock_container *old_sc = nn->nn_sc; | |
452 | ||
453 | assert_spin_locked(&nn->nn_lock); | |
454 | ||
828ae6af AB |
455 | if (old_sc && !sc) |
456 | atomic_dec(&o2net_connected_peers); | |
457 | else if (!old_sc && sc) | |
458 | atomic_inc(&o2net_connected_peers); | |
459 | ||
98211489 ZB |
460 | /* the node num comparison and single connect/accept path should stop |
461 | * an non-null sc from being overwritten with another */ | |
462 | BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); | |
463 | mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); | |
464 | mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); | |
465 | ||
98211489 ZB |
466 | if (was_valid && !valid && err == 0) |
467 | err = -ENOTCONN; | |
468 | ||
469 | mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", | |
470 | o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, | |
471 | nn->nn_persistent_error, err); | |
472 | ||
473 | nn->nn_sc = sc; | |
474 | nn->nn_sc_valid = valid ? 1 : 0; | |
475 | nn->nn_persistent_error = err; | |
476 | ||
477 | /* mirrors o2net_tx_can_proceed() */ | |
478 | if (nn->nn_persistent_error || nn->nn_sc_valid) | |
479 | wake_up(&nn->nn_sc_wq); | |
480 | ||
481 | if (!was_err && nn->nn_persistent_error) { | |
482 | o2quo_conn_err(o2net_num_from_nn(nn)); | |
483 | queue_delayed_work(o2net_wq, &nn->nn_still_up, | |
484 | msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); | |
485 | } | |
486 | ||
487 | if (was_valid && !valid) { | |
6efd8066 | 488 | printk(KERN_NOTICE "o2net: no longer connected to " |
781ee3e2 | 489 | SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); |
98211489 ZB |
490 | o2net_complete_nodes_nsw(nn); |
491 | } | |
492 | ||
493 | if (!was_valid && valid) { | |
494 | o2quo_conn_up(o2net_num_from_nn(nn)); | |
98211489 | 495 | cancel_delayed_work(&nn->nn_connect_expired); |
6efd8066 | 496 | printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", |
781ee3e2 SM |
497 | o2nm_this_node() > sc->sc_node->nd_num ? |
498 | "connected to" : "accepted connection from", | |
499 | SC_NODEF_ARGS(sc)); | |
98211489 ZB |
500 | } |
501 | ||
502 | /* trigger the connecting worker func as long as we're not valid, | |
503 | * it will back off if it shouldn't connect. This can be called | |
504 | * from node config teardown and so needs to be careful about | |
505 | * the work queue actually being up. */ | |
506 | if (!valid && o2net_wq) { | |
507 | unsigned long delay; | |
508 | /* delay if we're withing a RECONNECT_DELAY of the | |
509 | * last attempt */ | |
510 | delay = (nn->nn_last_connect_attempt + | |
409753bf | 511 | msecs_to_jiffies(o2net_reconnect_delay())) |
98211489 | 512 | - jiffies; |
409753bf | 513 | if (delay > msecs_to_jiffies(o2net_reconnect_delay())) |
98211489 ZB |
514 | delay = 0; |
515 | mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); | |
516 | queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); | |
5cc3bf27 TM |
517 | |
518 | /* | |
519 | * Delay the expired work after idle timeout. | |
520 | * | |
521 | * We might have lots of failed connection attempts that run | |
522 | * through here but we only cancel the connect_expired work when | |
523 | * a connection attempt succeeds. So only the first enqueue of | |
524 | * the connect_expired work will do anything. The rest will see | |
525 | * that it's already queued and do nothing. | |
526 | */ | |
409753bf | 527 | delay += msecs_to_jiffies(o2net_idle_timeout()); |
5cc3bf27 | 528 | queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); |
98211489 ZB |
529 | } |
530 | ||
531 | /* keep track of the nn's sc ref for the caller */ | |
532 | if ((old_sc == NULL) && sc) | |
533 | sc_get(sc); | |
534 | if (old_sc && (old_sc != sc)) { | |
535 | o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); | |
536 | sc_put(old_sc); | |
537 | } | |
538 | } | |
539 | ||
540 | /* see o2net_register_callbacks() */ | |
541 | static void o2net_data_ready(struct sock *sk, int bytes) | |
542 | { | |
543 | void (*ready)(struct sock *sk, int bytes); | |
544 | ||
545 | read_lock(&sk->sk_callback_lock); | |
546 | if (sk->sk_user_data) { | |
547 | struct o2net_sock_container *sc = sk->sk_user_data; | |
548 | sclog(sc, "data_ready hit\n"); | |
549 | do_gettimeofday(&sc->sc_tv_data_ready); | |
550 | o2net_sc_queue_work(sc, &sc->sc_rx_work); | |
551 | ready = sc->sc_data_ready; | |
552 | } else { | |
553 | ready = sk->sk_data_ready; | |
554 | } | |
555 | read_unlock(&sk->sk_callback_lock); | |
556 | ||
557 | ready(sk, bytes); | |
558 | } | |
559 | ||
560 | /* see o2net_register_callbacks() */ | |
561 | static void o2net_state_change(struct sock *sk) | |
562 | { | |
563 | void (*state_change)(struct sock *sk); | |
564 | struct o2net_sock_container *sc; | |
565 | ||
566 | read_lock(&sk->sk_callback_lock); | |
567 | sc = sk->sk_user_data; | |
568 | if (sc == NULL) { | |
569 | state_change = sk->sk_state_change; | |
570 | goto out; | |
571 | } | |
572 | ||
573 | sclog(sc, "state_change to %d\n", sk->sk_state); | |
574 | ||
575 | state_change = sc->sc_state_change; | |
576 | ||
577 | switch(sk->sk_state) { | |
578 | /* ignore connecting sockets as they make progress */ | |
579 | case TCP_SYN_SENT: | |
580 | case TCP_SYN_RECV: | |
581 | break; | |
582 | case TCP_ESTABLISHED: | |
583 | o2net_sc_queue_work(sc, &sc->sc_connect_work); | |
584 | break; | |
585 | default: | |
23fd9abd SE |
586 | printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT |
587 | " shutdown, state %d\n", | |
588 | SC_NODEF_ARGS(sc), sk->sk_state); | |
98211489 ZB |
589 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
590 | break; | |
591 | } | |
592 | out: | |
593 | read_unlock(&sk->sk_callback_lock); | |
594 | state_change(sk); | |
595 | } | |
596 | ||
597 | /* | |
598 | * we register callbacks so we can queue work on events before calling | |
599 | * the original callbacks. our callbacks our careful to test user_data | |
600 | * to discover when they've reaced with o2net_unregister_callbacks(). | |
601 | */ | |
602 | static void o2net_register_callbacks(struct sock *sk, | |
603 | struct o2net_sock_container *sc) | |
604 | { | |
605 | write_lock_bh(&sk->sk_callback_lock); | |
606 | ||
607 | /* accepted sockets inherit the old listen socket data ready */ | |
608 | if (sk->sk_data_ready == o2net_listen_data_ready) { | |
609 | sk->sk_data_ready = sk->sk_user_data; | |
610 | sk->sk_user_data = NULL; | |
611 | } | |
612 | ||
613 | BUG_ON(sk->sk_user_data != NULL); | |
614 | sk->sk_user_data = sc; | |
615 | sc_get(sc); | |
616 | ||
617 | sc->sc_data_ready = sk->sk_data_ready; | |
618 | sc->sc_state_change = sk->sk_state_change; | |
619 | sk->sk_data_ready = o2net_data_ready; | |
620 | sk->sk_state_change = o2net_state_change; | |
621 | ||
925037bc ZW |
622 | mutex_init(&sc->sc_send_lock); |
623 | ||
98211489 ZB |
624 | write_unlock_bh(&sk->sk_callback_lock); |
625 | } | |
626 | ||
627 | static int o2net_unregister_callbacks(struct sock *sk, | |
628 | struct o2net_sock_container *sc) | |
629 | { | |
630 | int ret = 0; | |
631 | ||
632 | write_lock_bh(&sk->sk_callback_lock); | |
633 | if (sk->sk_user_data == sc) { | |
634 | ret = 1; | |
635 | sk->sk_user_data = NULL; | |
636 | sk->sk_data_ready = sc->sc_data_ready; | |
637 | sk->sk_state_change = sc->sc_state_change; | |
638 | } | |
639 | write_unlock_bh(&sk->sk_callback_lock); | |
640 | ||
641 | return ret; | |
642 | } | |
643 | ||
644 | /* | |
645 | * this is a little helper that is called by callers who have seen a problem | |
646 | * with an sc and want to detach it from the nn if someone already hasn't beat | |
647 | * them to it. if an error is given then the shutdown will be persistent | |
648 | * and pending transmits will be canceled. | |
649 | */ | |
650 | static void o2net_ensure_shutdown(struct o2net_node *nn, | |
651 | struct o2net_sock_container *sc, | |
652 | int err) | |
653 | { | |
654 | spin_lock(&nn->nn_lock); | |
655 | if (nn->nn_sc == sc) | |
656 | o2net_set_nn_state(nn, NULL, 0, err); | |
657 | spin_unlock(&nn->nn_lock); | |
658 | } | |
659 | ||
660 | /* | |
661 | * This work queue function performs the blocking parts of socket shutdown. A | |
662 | * few paths lead here. set_nn_state will trigger this callback if it sees an | |
663 | * sc detached from the nn. state_change will also trigger this callback | |
664 | * directly when it sees errors. In that case we need to call set_nn_state | |
665 | * ourselves as state_change couldn't get the nn_lock and call set_nn_state | |
666 | * itself. | |
667 | */ | |
c4028958 | 668 | static void o2net_shutdown_sc(struct work_struct *work) |
98211489 | 669 | { |
c4028958 DH |
670 | struct o2net_sock_container *sc = |
671 | container_of(work, struct o2net_sock_container, | |
672 | sc_shutdown_work); | |
98211489 ZB |
673 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
674 | ||
675 | sclog(sc, "shutting down\n"); | |
676 | ||
677 | /* drop the callbacks ref and call shutdown only once */ | |
678 | if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { | |
679 | /* we shouldn't flush as we're in the thread, the | |
680 | * races with pending sc work structs are harmless */ | |
681 | del_timer_sync(&sc->sc_idle_timeout); | |
682 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); | |
683 | sc_put(sc); | |
91cf45f0 | 684 | kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); |
98211489 ZB |
685 | } |
686 | ||
687 | /* not fatal so failed connects before the other guy has our | |
688 | * heartbeat can be retried */ | |
689 | o2net_ensure_shutdown(nn, sc, 0); | |
690 | sc_put(sc); | |
691 | } | |
692 | ||
693 | /* ------------------------------------------------------------ */ | |
694 | ||
695 | static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, | |
696 | u32 key) | |
697 | { | |
698 | int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); | |
699 | ||
700 | if (ret == 0) | |
701 | ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); | |
702 | ||
703 | return ret; | |
704 | } | |
705 | ||
706 | static struct o2net_msg_handler * | |
707 | o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, | |
708 | struct rb_node **ret_parent) | |
709 | { | |
710 | struct rb_node **p = &o2net_handler_tree.rb_node; | |
711 | struct rb_node *parent = NULL; | |
712 | struct o2net_msg_handler *nmh, *ret = NULL; | |
713 | int cmp; | |
714 | ||
715 | while (*p) { | |
716 | parent = *p; | |
717 | nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); | |
718 | cmp = o2net_handler_cmp(nmh, msg_type, key); | |
719 | ||
720 | if (cmp < 0) | |
721 | p = &(*p)->rb_left; | |
722 | else if (cmp > 0) | |
723 | p = &(*p)->rb_right; | |
724 | else { | |
725 | ret = nmh; | |
726 | break; | |
727 | } | |
728 | } | |
729 | ||
730 | if (ret_p != NULL) | |
731 | *ret_p = p; | |
732 | if (ret_parent != NULL) | |
733 | *ret_parent = parent; | |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
738 | static void o2net_handler_kref_release(struct kref *kref) | |
739 | { | |
740 | struct o2net_msg_handler *nmh; | |
741 | nmh = container_of(kref, struct o2net_msg_handler, nh_kref); | |
742 | ||
743 | kfree(nmh); | |
744 | } | |
745 | ||
746 | static void o2net_handler_put(struct o2net_msg_handler *nmh) | |
747 | { | |
748 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); | |
749 | } | |
750 | ||
751 | /* max_len is protection for the handler func. incoming messages won't | |
752 | * be given to the handler if their payload is longer than the max. */ | |
753 | int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, | |
754 | o2net_msg_handler_func *func, void *data, | |
d74c9803 | 755 | o2net_post_msg_handler_func *post_func, |
98211489 ZB |
756 | struct list_head *unreg_list) |
757 | { | |
758 | struct o2net_msg_handler *nmh = NULL; | |
759 | struct rb_node **p, *parent; | |
760 | int ret = 0; | |
761 | ||
762 | if (max_len > O2NET_MAX_PAYLOAD_BYTES) { | |
763 | mlog(0, "max_len for message handler out of range: %u\n", | |
764 | max_len); | |
765 | ret = -EINVAL; | |
766 | goto out; | |
767 | } | |
768 | ||
769 | if (!msg_type) { | |
770 | mlog(0, "no message type provided: %u, %p\n", msg_type, func); | |
771 | ret = -EINVAL; | |
772 | goto out; | |
773 | ||
774 | } | |
775 | if (!func) { | |
776 | mlog(0, "no message handler provided: %u, %p\n", | |
777 | msg_type, func); | |
778 | ret = -EINVAL; | |
779 | goto out; | |
780 | } | |
781 | ||
cd861280 | 782 | nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); |
98211489 ZB |
783 | if (nmh == NULL) { |
784 | ret = -ENOMEM; | |
785 | goto out; | |
786 | } | |
787 | ||
788 | nmh->nh_func = func; | |
789 | nmh->nh_func_data = data; | |
d74c9803 | 790 | nmh->nh_post_func = post_func; |
98211489 ZB |
791 | nmh->nh_msg_type = msg_type; |
792 | nmh->nh_max_len = max_len; | |
793 | nmh->nh_key = key; | |
794 | /* the tree and list get this ref.. they're both removed in | |
795 | * unregister when this ref is dropped */ | |
796 | kref_init(&nmh->nh_kref); | |
797 | INIT_LIST_HEAD(&nmh->nh_unregister_item); | |
798 | ||
799 | write_lock(&o2net_handler_lock); | |
800 | if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) | |
801 | ret = -EEXIST; | |
802 | else { | |
803 | rb_link_node(&nmh->nh_node, parent, p); | |
804 | rb_insert_color(&nmh->nh_node, &o2net_handler_tree); | |
805 | list_add_tail(&nmh->nh_unregister_item, unreg_list); | |
806 | ||
807 | mlog(ML_TCP, "registered handler func %p type %u key %08x\n", | |
808 | func, msg_type, key); | |
809 | /* we've had some trouble with handlers seemingly vanishing. */ | |
810 | mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, | |
811 | &parent) == NULL, | |
812 | "couldn't find handler we *just* registerd " | |
813 | "for type %u key %08x\n", msg_type, key); | |
814 | } | |
815 | write_unlock(&o2net_handler_lock); | |
816 | if (ret) | |
817 | goto out; | |
818 | ||
819 | out: | |
820 | if (ret) | |
821 | kfree(nmh); | |
822 | ||
823 | return ret; | |
824 | } | |
825 | EXPORT_SYMBOL_GPL(o2net_register_handler); | |
826 | ||
827 | void o2net_unregister_handler_list(struct list_head *list) | |
828 | { | |
800deef3 | 829 | struct o2net_msg_handler *nmh, *n; |
98211489 ZB |
830 | |
831 | write_lock(&o2net_handler_lock); | |
800deef3 | 832 | list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { |
98211489 ZB |
833 | mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", |
834 | nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); | |
835 | rb_erase(&nmh->nh_node, &o2net_handler_tree); | |
836 | list_del_init(&nmh->nh_unregister_item); | |
837 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); | |
838 | } | |
839 | write_unlock(&o2net_handler_lock); | |
840 | } | |
841 | EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); | |
842 | ||
843 | static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) | |
844 | { | |
845 | struct o2net_msg_handler *nmh; | |
846 | ||
847 | read_lock(&o2net_handler_lock); | |
848 | nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); | |
849 | if (nmh) | |
850 | kref_get(&nmh->nh_kref); | |
851 | read_unlock(&o2net_handler_lock); | |
852 | ||
853 | return nmh; | |
854 | } | |
855 | ||
856 | /* ------------------------------------------------------------ */ | |
857 | ||
858 | static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) | |
859 | { | |
860 | int ret; | |
861 | mm_segment_t oldfs; | |
862 | struct kvec vec = { | |
863 | .iov_len = len, | |
864 | .iov_base = data, | |
865 | }; | |
866 | struct msghdr msg = { | |
867 | .msg_iovlen = 1, | |
868 | .msg_iov = (struct iovec *)&vec, | |
869 | .msg_flags = MSG_DONTWAIT, | |
870 | }; | |
871 | ||
872 | oldfs = get_fs(); | |
873 | set_fs(get_ds()); | |
874 | ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); | |
875 | set_fs(oldfs); | |
876 | ||
877 | return ret; | |
878 | } | |
879 | ||
880 | static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, | |
881 | size_t veclen, size_t total) | |
882 | { | |
883 | int ret; | |
884 | mm_segment_t oldfs; | |
885 | struct msghdr msg = { | |
886 | .msg_iov = (struct iovec *)vec, | |
887 | .msg_iovlen = veclen, | |
888 | }; | |
889 | ||
890 | if (sock == NULL) { | |
891 | ret = -EINVAL; | |
892 | goto out; | |
893 | } | |
894 | ||
895 | oldfs = get_fs(); | |
896 | set_fs(get_ds()); | |
897 | ret = sock_sendmsg(sock, &msg, total); | |
898 | set_fs(oldfs); | |
899 | if (ret != total) { | |
900 | mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, | |
901 | total); | |
902 | if (ret >= 0) | |
903 | ret = -EPIPE; /* should be smarter, I bet */ | |
904 | goto out; | |
905 | } | |
906 | ||
907 | ret = 0; | |
908 | out: | |
909 | if (ret < 0) | |
910 | mlog(0, "returning error: %d\n", ret); | |
911 | return ret; | |
912 | } | |
913 | ||
914 | static void o2net_sendpage(struct o2net_sock_container *sc, | |
915 | void *kmalloced_virt, | |
916 | size_t size) | |
917 | { | |
918 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
919 | ssize_t ret; | |
920 | ||
ce17204a SM |
921 | while (1) { |
922 | mutex_lock(&sc->sc_send_lock); | |
923 | ret = sc->sc_sock->ops->sendpage(sc->sc_sock, | |
924 | virt_to_page(kmalloced_virt), | |
925 | (long)kmalloced_virt & ~PAGE_MASK, | |
926 | size, MSG_DONTWAIT); | |
927 | mutex_unlock(&sc->sc_send_lock); | |
928 | if (ret == size) | |
929 | break; | |
930 | if (ret == (ssize_t)-EAGAIN) { | |
931 | mlog(0, "sendpage of size %zu to " SC_NODEF_FMT | |
932 | " returned EAGAIN\n", size, SC_NODEF_ARGS(sc)); | |
933 | cond_resched(); | |
934 | continue; | |
935 | } | |
2bd63216 | 936 | mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT |
98211489 ZB |
937 | " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); |
938 | o2net_ensure_shutdown(nn, sc, 0); | |
ce17204a | 939 | break; |
98211489 ZB |
940 | } |
941 | } | |
942 | ||
943 | static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) | |
944 | { | |
945 | memset(msg, 0, sizeof(struct o2net_msg)); | |
946 | msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); | |
947 | msg->data_len = cpu_to_be16(data_len); | |
948 | msg->msg_type = cpu_to_be16(msg_type); | |
949 | msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); | |
950 | msg->status = 0; | |
951 | msg->key = cpu_to_be32(key); | |
952 | } | |
953 | ||
954 | static int o2net_tx_can_proceed(struct o2net_node *nn, | |
955 | struct o2net_sock_container **sc_ret, | |
956 | int *error) | |
957 | { | |
958 | int ret = 0; | |
959 | ||
960 | spin_lock(&nn->nn_lock); | |
961 | if (nn->nn_persistent_error) { | |
962 | ret = 1; | |
963 | *sc_ret = NULL; | |
964 | *error = nn->nn_persistent_error; | |
965 | } else if (nn->nn_sc_valid) { | |
966 | kref_get(&nn->nn_sc->sc_kref); | |
967 | ||
968 | ret = 1; | |
969 | *sc_ret = nn->nn_sc; | |
970 | *error = 0; | |
971 | } | |
972 | spin_unlock(&nn->nn_lock); | |
973 | ||
974 | return ret; | |
975 | } | |
976 | ||
977 | int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, | |
978 | size_t caller_veclen, u8 target_node, int *status) | |
979 | { | |
9af0b38f | 980 | int ret; |
98211489 ZB |
981 | struct o2net_msg *msg = NULL; |
982 | size_t veclen, caller_bytes = 0; | |
983 | struct kvec *vec = NULL; | |
984 | struct o2net_sock_container *sc = NULL; | |
985 | struct o2net_node *nn = o2net_nn_from_num(target_node); | |
986 | struct o2net_status_wait nsw = { | |
987 | .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), | |
988 | }; | |
2309e9e0 SM |
989 | struct o2net_send_tracking nst; |
990 | ||
991 | o2net_init_nst(&nst, msg_type, key, current, target_node); | |
98211489 ZB |
992 | |
993 | if (o2net_wq == NULL) { | |
994 | mlog(0, "attempt to tx without o2netd running\n"); | |
995 | ret = -ESRCH; | |
996 | goto out; | |
997 | } | |
998 | ||
999 | if (caller_veclen == 0) { | |
1000 | mlog(0, "bad kvec array length\n"); | |
1001 | ret = -EINVAL; | |
1002 | goto out; | |
1003 | } | |
1004 | ||
1005 | caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); | |
1006 | if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { | |
1007 | mlog(0, "total payload len %zu too large\n", caller_bytes); | |
1008 | ret = -EINVAL; | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | if (target_node == o2nm_this_node()) { | |
1013 | ret = -ELOOP; | |
1014 | goto out; | |
1015 | } | |
1016 | ||
2309e9e0 SM |
1017 | o2net_debug_add_nst(&nst); |
1018 | ||
1019 | o2net_set_nst_sock_time(&nst); | |
1020 | ||
9af0b38f | 1021 | wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); |
98211489 ZB |
1022 | if (ret) |
1023 | goto out; | |
1024 | ||
2309e9e0 SM |
1025 | o2net_set_nst_sock_container(&nst, sc); |
1026 | ||
98211489 ZB |
1027 | veclen = caller_veclen + 1; |
1028 | vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); | |
1029 | if (vec == NULL) { | |
1030 | mlog(0, "failed to %zu element kvec!\n", veclen); | |
1031 | ret = -ENOMEM; | |
1032 | goto out; | |
1033 | } | |
1034 | ||
1035 | msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); | |
1036 | if (!msg) { | |
1037 | mlog(0, "failed to allocate a o2net_msg!\n"); | |
1038 | ret = -ENOMEM; | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | o2net_init_msg(msg, caller_bytes, msg_type, key); | |
1043 | ||
1044 | vec[0].iov_len = sizeof(struct o2net_msg); | |
1045 | vec[0].iov_base = msg; | |
1046 | memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); | |
1047 | ||
1048 | ret = o2net_prep_nsw(nn, &nsw); | |
1049 | if (ret) | |
1050 | goto out; | |
1051 | ||
1052 | msg->msg_num = cpu_to_be32(nsw.ns_id); | |
2309e9e0 SM |
1053 | o2net_set_nst_msg_id(&nst, nsw.ns_id); |
1054 | ||
1055 | o2net_set_nst_send_time(&nst); | |
98211489 ZB |
1056 | |
1057 | /* finally, convert the message header to network byte-order | |
1058 | * and send */ | |
925037bc | 1059 | mutex_lock(&sc->sc_send_lock); |
98211489 ZB |
1060 | ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, |
1061 | sizeof(struct o2net_msg) + caller_bytes); | |
925037bc | 1062 | mutex_unlock(&sc->sc_send_lock); |
98211489 ZB |
1063 | msglog(msg, "sending returned %d\n", ret); |
1064 | if (ret < 0) { | |
1065 | mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); | |
1066 | goto out; | |
1067 | } | |
1068 | ||
1069 | /* wait on other node's handler */ | |
2309e9e0 | 1070 | o2net_set_nst_status_time(&nst); |
98211489 ZB |
1071 | wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); |
1072 | ||
1073 | /* Note that we avoid overwriting the callers status return | |
1074 | * variable if a system error was reported on the other | |
1075 | * side. Callers beware. */ | |
1076 | ret = o2net_sys_err_to_errno(nsw.ns_sys_status); | |
1077 | if (status && !ret) | |
1078 | *status = nsw.ns_status; | |
1079 | ||
1080 | mlog(0, "woken, returning system status %d, user status %d\n", | |
1081 | ret, nsw.ns_status); | |
1082 | out: | |
2309e9e0 | 1083 | o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ |
98211489 ZB |
1084 | if (sc) |
1085 | sc_put(sc); | |
1086 | if (vec) | |
1087 | kfree(vec); | |
1088 | if (msg) | |
1089 | kfree(msg); | |
1090 | o2net_complete_nsw(nn, &nsw, 0, 0, 0); | |
1091 | return ret; | |
1092 | } | |
1093 | EXPORT_SYMBOL_GPL(o2net_send_message_vec); | |
1094 | ||
1095 | int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, | |
1096 | u8 target_node, int *status) | |
1097 | { | |
1098 | struct kvec vec = { | |
1099 | .iov_base = data, | |
1100 | .iov_len = len, | |
1101 | }; | |
1102 | return o2net_send_message_vec(msg_type, key, &vec, 1, | |
1103 | target_node, status); | |
1104 | } | |
1105 | EXPORT_SYMBOL_GPL(o2net_send_message); | |
1106 | ||
1107 | static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, | |
1108 | enum o2net_system_error syserr, int err) | |
1109 | { | |
1110 | struct kvec vec = { | |
1111 | .iov_base = hdr, | |
1112 | .iov_len = sizeof(struct o2net_msg), | |
1113 | }; | |
1114 | ||
1115 | BUG_ON(syserr >= O2NET_ERR_MAX); | |
1116 | ||
1117 | /* leave other fields intact from the incoming message, msg_num | |
1118 | * in particular */ | |
1119 | hdr->sys_status = cpu_to_be32(syserr); | |
1120 | hdr->status = cpu_to_be32(err); | |
1121 | hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic | |
1122 | hdr->data_len = 0; | |
1123 | ||
1124 | msglog(hdr, "about to send status magic %d\n", err); | |
1125 | /* hdr has been in host byteorder this whole time */ | |
1126 | return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); | |
1127 | } | |
1128 | ||
1129 | /* this returns -errno if the header was unknown or too large, etc. | |
1130 | * after this is called the buffer us reused for the next message */ | |
1131 | static int o2net_process_message(struct o2net_sock_container *sc, | |
1132 | struct o2net_msg *hdr) | |
1133 | { | |
1134 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
1135 | int ret = 0, handler_status; | |
1136 | enum o2net_system_error syserr; | |
1137 | struct o2net_msg_handler *nmh = NULL; | |
d74c9803 | 1138 | void *ret_data = NULL; |
98211489 ZB |
1139 | |
1140 | msglog(hdr, "processing message\n"); | |
1141 | ||
1142 | o2net_sc_postpone_idle(sc); | |
1143 | ||
1144 | switch(be16_to_cpu(hdr->magic)) { | |
1145 | case O2NET_MSG_STATUS_MAGIC: | |
1146 | /* special type for returning message status */ | |
1147 | o2net_complete_nsw(nn, NULL, | |
1148 | be32_to_cpu(hdr->msg_num), | |
1149 | be32_to_cpu(hdr->sys_status), | |
1150 | be32_to_cpu(hdr->status)); | |
1151 | goto out; | |
1152 | case O2NET_MSG_KEEP_REQ_MAGIC: | |
1153 | o2net_sendpage(sc, o2net_keep_resp, | |
1154 | sizeof(*o2net_keep_resp)); | |
1155 | goto out; | |
1156 | case O2NET_MSG_KEEP_RESP_MAGIC: | |
1157 | goto out; | |
1158 | case O2NET_MSG_MAGIC: | |
1159 | break; | |
1160 | default: | |
1161 | msglog(hdr, "bad magic\n"); | |
1162 | ret = -EINVAL; | |
1163 | goto out; | |
1164 | break; | |
1165 | } | |
1166 | ||
1167 | /* find a handler for it */ | |
1168 | handler_status = 0; | |
1169 | nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), | |
1170 | be32_to_cpu(hdr->key)); | |
1171 | if (!nmh) { | |
1172 | mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", | |
1173 | be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); | |
1174 | syserr = O2NET_ERR_NO_HNDLR; | |
1175 | goto out_respond; | |
1176 | } | |
1177 | ||
1178 | syserr = O2NET_ERR_NONE; | |
1179 | ||
1180 | if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) | |
1181 | syserr = O2NET_ERR_OVERFLOW; | |
1182 | ||
1183 | if (syserr != O2NET_ERR_NONE) | |
1184 | goto out_respond; | |
1185 | ||
1186 | do_gettimeofday(&sc->sc_tv_func_start); | |
1187 | sc->sc_msg_key = be32_to_cpu(hdr->key); | |
1188 | sc->sc_msg_type = be16_to_cpu(hdr->msg_type); | |
1189 | handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + | |
1190 | be16_to_cpu(hdr->data_len), | |
d74c9803 | 1191 | nmh->nh_func_data, &ret_data); |
98211489 ZB |
1192 | do_gettimeofday(&sc->sc_tv_func_stop); |
1193 | ||
1194 | out_respond: | |
1195 | /* this destroys the hdr, so don't use it after this */ | |
925037bc | 1196 | mutex_lock(&sc->sc_send_lock); |
98211489 ZB |
1197 | ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, |
1198 | handler_status); | |
925037bc | 1199 | mutex_unlock(&sc->sc_send_lock); |
98211489 ZB |
1200 | hdr = NULL; |
1201 | mlog(0, "sending handler status %d, syserr %d returned %d\n", | |
1202 | handler_status, syserr, ret); | |
1203 | ||
d74c9803 KH |
1204 | if (nmh) { |
1205 | BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); | |
1206 | if (nmh->nh_post_func) | |
1207 | (nmh->nh_post_func)(handler_status, nmh->nh_func_data, | |
1208 | ret_data); | |
1209 | } | |
1210 | ||
98211489 ZB |
1211 | out: |
1212 | if (nmh) | |
1213 | o2net_handler_put(nmh); | |
1214 | return ret; | |
1215 | } | |
1216 | ||
1217 | static int o2net_check_handshake(struct o2net_sock_container *sc) | |
1218 | { | |
1219 | struct o2net_handshake *hand = page_address(sc->sc_page); | |
1220 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
1221 | ||
1222 | if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { | |
1223 | mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol " | |
1224 | "version %llu but %llu is required, disconnecting\n", | |
1225 | SC_NODEF_ARGS(sc), | |
1226 | (unsigned long long)be64_to_cpu(hand->protocol_version), | |
1227 | O2NET_PROTOCOL_VERSION); | |
1228 | ||
1229 | /* don't bother reconnecting if its the wrong version. */ | |
1230 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); | |
1231 | return -1; | |
1232 | } | |
1233 | ||
828ae6af AB |
1234 | /* |
1235 | * Ensure timeouts are consistent with other nodes, otherwise | |
1236 | * we can end up with one node thinking that the other must be down, | |
1237 | * but isn't. This can ultimately cause corruption. | |
1238 | */ | |
1239 | if (be32_to_cpu(hand->o2net_idle_timeout_ms) != | |
409753bf | 1240 | o2net_idle_timeout()) { |
828ae6af AB |
1241 | mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of " |
1242 | "%u ms, but we use %u ms locally. disconnecting\n", | |
1243 | SC_NODEF_ARGS(sc), | |
1244 | be32_to_cpu(hand->o2net_idle_timeout_ms), | |
409753bf | 1245 | o2net_idle_timeout()); |
828ae6af AB |
1246 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1247 | return -1; | |
1248 | } | |
1249 | ||
1250 | if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != | |
409753bf | 1251 | o2net_keepalive_delay()) { |
828ae6af AB |
1252 | mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of " |
1253 | "%u ms, but we use %u ms locally. disconnecting\n", | |
1254 | SC_NODEF_ARGS(sc), | |
1255 | be32_to_cpu(hand->o2net_keepalive_delay_ms), | |
409753bf | 1256 | o2net_keepalive_delay()); |
828ae6af AB |
1257 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1258 | return -1; | |
1259 | } | |
1260 | ||
1261 | if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != | |
1262 | O2HB_MAX_WRITE_TIMEOUT_MS) { | |
1263 | mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of " | |
1264 | "%u ms, but we use %u ms locally. disconnecting\n", | |
1265 | SC_NODEF_ARGS(sc), | |
1266 | be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), | |
1267 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
1268 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); | |
1269 | return -1; | |
1270 | } | |
1271 | ||
98211489 ZB |
1272 | sc->sc_handshake_ok = 1; |
1273 | ||
1274 | spin_lock(&nn->nn_lock); | |
1275 | /* set valid and queue the idle timers only if it hasn't been | |
1276 | * shut down already */ | |
1277 | if (nn->nn_sc == sc) { | |
b5dd8030 | 1278 | o2net_sc_reset_idle_timer(sc); |
5cc3bf27 | 1279 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1280 | o2net_set_nn_state(nn, sc, 1, 0); |
1281 | } | |
1282 | spin_unlock(&nn->nn_lock); | |
1283 | ||
1284 | /* shift everything up as though it wasn't there */ | |
1285 | sc->sc_page_off -= sizeof(struct o2net_handshake); | |
1286 | if (sc->sc_page_off) | |
1287 | memmove(hand, hand + 1, sc->sc_page_off); | |
1288 | ||
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | /* this demuxes the queued rx bytes into header or payload bits and calls | |
1293 | * handlers as each full message is read off the socket. it returns -error, | |
1294 | * == 0 eof, or > 0 for progress made.*/ | |
1295 | static int o2net_advance_rx(struct o2net_sock_container *sc) | |
1296 | { | |
1297 | struct o2net_msg *hdr; | |
1298 | int ret = 0; | |
1299 | void *data; | |
1300 | size_t datalen; | |
1301 | ||
1302 | sclog(sc, "receiving\n"); | |
1303 | do_gettimeofday(&sc->sc_tv_advance_start); | |
1304 | ||
828ae6af AB |
1305 | if (unlikely(sc->sc_handshake_ok == 0)) { |
1306 | if(sc->sc_page_off < sizeof(struct o2net_handshake)) { | |
1307 | data = page_address(sc->sc_page) + sc->sc_page_off; | |
1308 | datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; | |
1309 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); | |
1310 | if (ret > 0) | |
1311 | sc->sc_page_off += ret; | |
1312 | } | |
1313 | ||
1314 | if (sc->sc_page_off == sizeof(struct o2net_handshake)) { | |
1315 | o2net_check_handshake(sc); | |
1316 | if (unlikely(sc->sc_handshake_ok == 0)) | |
1317 | ret = -EPROTO; | |
1318 | } | |
1319 | goto out; | |
1320 | } | |
1321 | ||
98211489 ZB |
1322 | /* do we need more header? */ |
1323 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { | |
1324 | data = page_address(sc->sc_page) + sc->sc_page_off; | |
1325 | datalen = sizeof(struct o2net_msg) - sc->sc_page_off; | |
1326 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); | |
1327 | if (ret > 0) { | |
1328 | sc->sc_page_off += ret; | |
98211489 ZB |
1329 | /* only swab incoming here.. we can |
1330 | * only get here once as we cross from | |
1331 | * being under to over */ | |
1332 | if (sc->sc_page_off == sizeof(struct o2net_msg)) { | |
1333 | hdr = page_address(sc->sc_page); | |
1334 | if (be16_to_cpu(hdr->data_len) > | |
1335 | O2NET_MAX_PAYLOAD_BYTES) | |
1336 | ret = -EOVERFLOW; | |
1337 | } | |
1338 | } | |
1339 | if (ret <= 0) | |
1340 | goto out; | |
1341 | } | |
1342 | ||
1343 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { | |
1344 | /* oof, still don't have a header */ | |
1345 | goto out; | |
1346 | } | |
1347 | ||
1348 | /* this was swabbed above when we first read it */ | |
1349 | hdr = page_address(sc->sc_page); | |
1350 | ||
1351 | msglog(hdr, "at page_off %zu\n", sc->sc_page_off); | |
1352 | ||
1353 | /* do we need more payload? */ | |
1354 | if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { | |
1355 | /* need more payload */ | |
1356 | data = page_address(sc->sc_page) + sc->sc_page_off; | |
1357 | datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - | |
1358 | sc->sc_page_off; | |
1359 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); | |
1360 | if (ret > 0) | |
1361 | sc->sc_page_off += ret; | |
1362 | if (ret <= 0) | |
1363 | goto out; | |
1364 | } | |
1365 | ||
1366 | if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { | |
1367 | /* we can only get here once, the first time we read | |
1368 | * the payload.. so set ret to progress if the handler | |
1369 | * works out. after calling this the message is toast */ | |
1370 | ret = o2net_process_message(sc, hdr); | |
1371 | if (ret == 0) | |
1372 | ret = 1; | |
1373 | sc->sc_page_off = 0; | |
1374 | } | |
1375 | ||
1376 | out: | |
1377 | sclog(sc, "ret = %d\n", ret); | |
1378 | do_gettimeofday(&sc->sc_tv_advance_stop); | |
1379 | return ret; | |
1380 | } | |
1381 | ||
1382 | /* this work func is triggerd by data ready. it reads until it can read no | |
1383 | * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing | |
1384 | * our work the work struct will be marked and we'll be called again. */ | |
c4028958 | 1385 | static void o2net_rx_until_empty(struct work_struct *work) |
98211489 | 1386 | { |
c4028958 DH |
1387 | struct o2net_sock_container *sc = |
1388 | container_of(work, struct o2net_sock_container, sc_rx_work); | |
98211489 ZB |
1389 | int ret; |
1390 | ||
1391 | do { | |
1392 | ret = o2net_advance_rx(sc); | |
1393 | } while (ret > 0); | |
1394 | ||
1395 | if (ret <= 0 && ret != -EAGAIN) { | |
1396 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
1397 | sclog(sc, "saw error %d, closing\n", ret); | |
1398 | /* not permanent so read failed handshake can retry */ | |
1399 | o2net_ensure_shutdown(nn, sc, 0); | |
1400 | } | |
1401 | ||
1402 | sc_put(sc); | |
1403 | } | |
1404 | ||
1405 | static int o2net_set_nodelay(struct socket *sock) | |
1406 | { | |
1407 | int ret, val = 1; | |
1408 | mm_segment_t oldfs; | |
1409 | ||
1410 | oldfs = get_fs(); | |
1411 | set_fs(KERNEL_DS); | |
1412 | ||
1413 | /* | |
1414 | * Dear unsuspecting programmer, | |
1415 | * | |
1416 | * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level | |
1417 | * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will | |
1418 | * silently turn into SO_DEBUG. | |
1419 | * | |
1420 | * Yours, | |
1421 | * Keeper of hilariously fragile interfaces. | |
1422 | */ | |
1423 | ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, | |
1424 | (char __user *)&val, sizeof(val)); | |
1425 | ||
1426 | set_fs(oldfs); | |
1427 | return ret; | |
1428 | } | |
1429 | ||
828ae6af AB |
1430 | static void o2net_initialize_handshake(void) |
1431 | { | |
1432 | o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( | |
1433 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
409753bf | 1434 | o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); |
828ae6af | 1435 | o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( |
409753bf | 1436 | o2net_keepalive_delay()); |
828ae6af | 1437 | o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( |
409753bf | 1438 | o2net_reconnect_delay()); |
828ae6af AB |
1439 | } |
1440 | ||
98211489 ZB |
1441 | /* ------------------------------------------------------------ */ |
1442 | ||
1443 | /* called when a connect completes and after a sock is accepted. the | |
1444 | * rx path will see the response and mark the sc valid */ | |
c4028958 | 1445 | static void o2net_sc_connect_completed(struct work_struct *work) |
98211489 | 1446 | { |
c4028958 DH |
1447 | struct o2net_sock_container *sc = |
1448 | container_of(work, struct o2net_sock_container, | |
1449 | sc_connect_work); | |
98211489 ZB |
1450 | |
1451 | mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", | |
1452 | (unsigned long long)O2NET_PROTOCOL_VERSION, | |
1453 | (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); | |
1454 | ||
828ae6af | 1455 | o2net_initialize_handshake(); |
98211489 ZB |
1456 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1457 | sc_put(sc); | |
1458 | } | |
1459 | ||
1460 | /* this is called as a work_struct func. */ | |
c4028958 | 1461 | static void o2net_sc_send_keep_req(struct work_struct *work) |
98211489 | 1462 | { |
c4028958 DH |
1463 | struct o2net_sock_container *sc = |
1464 | container_of(work, struct o2net_sock_container, | |
1465 | sc_keepalive_work.work); | |
98211489 ZB |
1466 | |
1467 | o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); | |
1468 | sc_put(sc); | |
1469 | } | |
1470 | ||
1471 | /* socket shutdown does a del_timer_sync against this as it tears down. | |
1472 | * we can't start this timer until we've got to the point in sc buildup | |
1473 | * where shutdown is going to be involved */ | |
1474 | static void o2net_idle_timer(unsigned long data) | |
1475 | { | |
1476 | struct o2net_sock_container *sc = (struct o2net_sock_container *)data; | |
5cc3bf27 | 1477 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
98211489 ZB |
1478 | struct timeval now; |
1479 | ||
1480 | do_gettimeofday(&now); | |
1481 | ||
6efd8066 | 1482 | printk(KERN_NOTICE "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u " |
b5dd8030 | 1483 | "seconds, shutting it down.\n", SC_NODEF_ARGS(sc), |
409753bf JM |
1484 | o2net_idle_timeout() / 1000, |
1485 | o2net_idle_timeout() % 1000); | |
98211489 ZB |
1486 | mlog(ML_NOTICE, "here are some times that might help debug the " |
1487 | "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv " | |
1488 | "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n", | |
2bd63216 | 1489 | sc->sc_tv_timer.tv_sec, (long) sc->sc_tv_timer.tv_usec, |
215c7f9f MF |
1490 | now.tv_sec, (long) now.tv_usec, |
1491 | sc->sc_tv_data_ready.tv_sec, (long) sc->sc_tv_data_ready.tv_usec, | |
1492 | sc->sc_tv_advance_start.tv_sec, | |
1493 | (long) sc->sc_tv_advance_start.tv_usec, | |
1494 | sc->sc_tv_advance_stop.tv_sec, | |
1495 | (long) sc->sc_tv_advance_stop.tv_usec, | |
98211489 | 1496 | sc->sc_msg_key, sc->sc_msg_type, |
215c7f9f MF |
1497 | sc->sc_tv_func_start.tv_sec, (long) sc->sc_tv_func_start.tv_usec, |
1498 | sc->sc_tv_func_stop.tv_sec, (long) sc->sc_tv_func_stop.tv_usec); | |
98211489 | 1499 | |
5cc3bf27 TM |
1500 | /* |
1501 | * Initialize the nn_timeout so that the next connection attempt | |
1502 | * will continue in o2net_start_connect. | |
1503 | */ | |
1504 | atomic_set(&nn->nn_timeout, 1); | |
1505 | ||
98211489 ZB |
1506 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
1507 | } | |
1508 | ||
b5dd8030 | 1509 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) |
98211489 ZB |
1510 | { |
1511 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); | |
1512 | o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, | |
409753bf | 1513 | msecs_to_jiffies(o2net_keepalive_delay())); |
98211489 ZB |
1514 | do_gettimeofday(&sc->sc_tv_timer); |
1515 | mod_timer(&sc->sc_idle_timeout, | |
409753bf | 1516 | jiffies + msecs_to_jiffies(o2net_idle_timeout())); |
b5dd8030 JM |
1517 | } |
1518 | ||
1519 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) | |
1520 | { | |
1521 | /* Only push out an existing timer */ | |
1522 | if (timer_pending(&sc->sc_idle_timeout)) | |
1523 | o2net_sc_reset_idle_timer(sc); | |
98211489 ZB |
1524 | } |
1525 | ||
1526 | /* this work func is kicked whenever a path sets the nn state which doesn't | |
1527 | * have valid set. This includes seeing hb come up, losing a connection, | |
1528 | * having a connect attempt fail, etc. This centralizes the logic which decides | |
1529 | * if a connect attempt should be made or if we should give up and all future | |
1530 | * transmit attempts should fail */ | |
c4028958 | 1531 | static void o2net_start_connect(struct work_struct *work) |
98211489 | 1532 | { |
c4028958 DH |
1533 | struct o2net_node *nn = |
1534 | container_of(work, struct o2net_node, nn_connect_work.work); | |
98211489 | 1535 | struct o2net_sock_container *sc = NULL; |
b7668c72 | 1536 | struct o2nm_node *node = NULL, *mynode = NULL; |
98211489 ZB |
1537 | struct socket *sock = NULL; |
1538 | struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; | |
c4028958 | 1539 | int ret = 0, stop; |
5cc3bf27 | 1540 | unsigned int timeout; |
98211489 ZB |
1541 | |
1542 | /* if we're greater we initiate tx, otherwise we accept */ | |
1543 | if (o2nm_this_node() <= o2net_num_from_nn(nn)) | |
1544 | goto out; | |
1545 | ||
1546 | /* watch for racing with tearing a node down */ | |
1547 | node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); | |
1548 | if (node == NULL) { | |
1549 | ret = 0; | |
1550 | goto out; | |
1551 | } | |
1552 | ||
b7668c72 SM |
1553 | mynode = o2nm_get_node_by_num(o2nm_this_node()); |
1554 | if (mynode == NULL) { | |
1555 | ret = 0; | |
1556 | goto out; | |
1557 | } | |
1558 | ||
98211489 | 1559 | spin_lock(&nn->nn_lock); |
5cc3bf27 TM |
1560 | /* |
1561 | * see if we already have one pending or have given up. | |
1562 | * For nn_timeout, it is set when we close the connection | |
1563 | * because of the idle time out. So it means that we have | |
1564 | * at least connected to that node successfully once, | |
1565 | * now try to connect to it again. | |
1566 | */ | |
1567 | timeout = atomic_read(&nn->nn_timeout); | |
1568 | stop = (nn->nn_sc || | |
1569 | (nn->nn_persistent_error && | |
1570 | (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); | |
98211489 | 1571 | spin_unlock(&nn->nn_lock); |
c4028958 | 1572 | if (stop) |
98211489 ZB |
1573 | goto out; |
1574 | ||
1575 | nn->nn_last_connect_attempt = jiffies; | |
1576 | ||
1577 | sc = sc_alloc(node); | |
1578 | if (sc == NULL) { | |
1579 | mlog(0, "couldn't allocate sc\n"); | |
1580 | ret = -ENOMEM; | |
1581 | goto out; | |
1582 | } | |
1583 | ||
1584 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1585 | if (ret < 0) { | |
1586 | mlog(0, "can't create socket: %d\n", ret); | |
1587 | goto out; | |
1588 | } | |
1589 | sc->sc_sock = sock; /* freed by sc_kref_release */ | |
1590 | ||
1591 | sock->sk->sk_allocation = GFP_ATOMIC; | |
1592 | ||
1593 | myaddr.sin_family = AF_INET; | |
5fdf1e67 | 1594 | myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; |
97bd7919 | 1595 | myaddr.sin_port = htons(0); /* any port */ |
98211489 ZB |
1596 | |
1597 | ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, | |
1598 | sizeof(myaddr)); | |
1599 | if (ret) { | |
be859405 HH |
1600 | mlog(ML_ERROR, "bind failed with %d at address %pI4\n", |
1601 | ret, &mynode->nd_ipv4_address); | |
98211489 ZB |
1602 | goto out; |
1603 | } | |
1604 | ||
1605 | ret = o2net_set_nodelay(sc->sc_sock); | |
1606 | if (ret) { | |
1607 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); | |
1608 | goto out; | |
1609 | } | |
1610 | ||
1611 | o2net_register_callbacks(sc->sc_sock->sk, sc); | |
1612 | ||
1613 | spin_lock(&nn->nn_lock); | |
1614 | /* handshake completion will set nn->nn_sc_valid */ | |
1615 | o2net_set_nn_state(nn, sc, 0, 0); | |
1616 | spin_unlock(&nn->nn_lock); | |
1617 | ||
1618 | remoteaddr.sin_family = AF_INET; | |
5fdf1e67 MF |
1619 | remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; |
1620 | remoteaddr.sin_port = node->nd_ipv4_port; | |
98211489 ZB |
1621 | |
1622 | ret = sc->sc_sock->ops->connect(sc->sc_sock, | |
1623 | (struct sockaddr *)&remoteaddr, | |
1624 | sizeof(remoteaddr), | |
1625 | O_NONBLOCK); | |
1626 | if (ret == -EINPROGRESS) | |
1627 | ret = 0; | |
1628 | ||
1629 | out: | |
1630 | if (ret) { | |
1631 | mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed " | |
1632 | "with errno %d\n", SC_NODEF_ARGS(sc), ret); | |
1633 | /* 0 err so that another will be queued and attempted | |
1634 | * from set_nn_state */ | |
1635 | if (sc) | |
1636 | o2net_ensure_shutdown(nn, sc, 0); | |
1637 | } | |
1638 | if (sc) | |
1639 | sc_put(sc); | |
1640 | if (node) | |
1641 | o2nm_node_put(node); | |
b7668c72 SM |
1642 | if (mynode) |
1643 | o2nm_node_put(mynode); | |
98211489 ZB |
1644 | |
1645 | return; | |
1646 | } | |
1647 | ||
c4028958 | 1648 | static void o2net_connect_expired(struct work_struct *work) |
98211489 | 1649 | { |
c4028958 DH |
1650 | struct o2net_node *nn = |
1651 | container_of(work, struct o2net_node, nn_connect_expired.work); | |
98211489 ZB |
1652 | |
1653 | spin_lock(&nn->nn_lock); | |
1654 | if (!nn->nn_sc_valid) { | |
1655 | mlog(ML_ERROR, "no connection established with node %u after " | |
b5dd8030 JM |
1656 | "%u.%u seconds, giving up and returning errors.\n", |
1657 | o2net_num_from_nn(nn), | |
409753bf JM |
1658 | o2net_idle_timeout() / 1000, |
1659 | o2net_idle_timeout() % 1000); | |
98211489 ZB |
1660 | |
1661 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); | |
1662 | } | |
1663 | spin_unlock(&nn->nn_lock); | |
1664 | } | |
1665 | ||
c4028958 | 1666 | static void o2net_still_up(struct work_struct *work) |
98211489 | 1667 | { |
c4028958 DH |
1668 | struct o2net_node *nn = |
1669 | container_of(work, struct o2net_node, nn_still_up.work); | |
98211489 ZB |
1670 | |
1671 | o2quo_hb_still_up(o2net_num_from_nn(nn)); | |
1672 | } | |
1673 | ||
1674 | /* ------------------------------------------------------------ */ | |
1675 | ||
1676 | void o2net_disconnect_node(struct o2nm_node *node) | |
1677 | { | |
1678 | struct o2net_node *nn = o2net_nn_from_num(node->nd_num); | |
1679 | ||
1680 | /* don't reconnect until it's heartbeating again */ | |
1681 | spin_lock(&nn->nn_lock); | |
5cc3bf27 | 1682 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1683 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
1684 | spin_unlock(&nn->nn_lock); | |
1685 | ||
1686 | if (o2net_wq) { | |
1687 | cancel_delayed_work(&nn->nn_connect_expired); | |
1688 | cancel_delayed_work(&nn->nn_connect_work); | |
1689 | cancel_delayed_work(&nn->nn_still_up); | |
1690 | flush_workqueue(o2net_wq); | |
1691 | } | |
1692 | } | |
1693 | ||
1694 | static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, | |
1695 | void *data) | |
1696 | { | |
1697 | o2quo_hb_down(node_num); | |
1698 | ||
1699 | if (node_num != o2nm_this_node()) | |
1700 | o2net_disconnect_node(node); | |
828ae6af AB |
1701 | |
1702 | BUG_ON(atomic_read(&o2net_connected_peers) < 0); | |
98211489 ZB |
1703 | } |
1704 | ||
1705 | static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, | |
1706 | void *data) | |
1707 | { | |
1708 | struct o2net_node *nn = o2net_nn_from_num(node_num); | |
1709 | ||
1710 | o2quo_hb_up(node_num); | |
1711 | ||
1712 | /* ensure an immediate connect attempt */ | |
1713 | nn->nn_last_connect_attempt = jiffies - | |
409753bf | 1714 | (msecs_to_jiffies(o2net_reconnect_delay()) + 1); |
98211489 ZB |
1715 | |
1716 | if (node_num != o2nm_this_node()) { | |
98211489 ZB |
1717 | /* believe it or not, accept and node hearbeating testing |
1718 | * can succeed for this node before we got here.. so | |
1719 | * only use set_nn_state to clear the persistent error | |
1720 | * if that hasn't already happened */ | |
1721 | spin_lock(&nn->nn_lock); | |
5cc3bf27 | 1722 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1723 | if (nn->nn_persistent_error) |
1724 | o2net_set_nn_state(nn, NULL, 0, 0); | |
1725 | spin_unlock(&nn->nn_lock); | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | void o2net_unregister_hb_callbacks(void) | |
1730 | { | |
14829422 JB |
1731 | o2hb_unregister_callback(NULL, &o2net_hb_up); |
1732 | o2hb_unregister_callback(NULL, &o2net_hb_down); | |
98211489 ZB |
1733 | } |
1734 | ||
1735 | int o2net_register_hb_callbacks(void) | |
1736 | { | |
1737 | int ret; | |
1738 | ||
1739 | o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, | |
1740 | o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); | |
1741 | o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, | |
1742 | o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); | |
1743 | ||
14829422 | 1744 | ret = o2hb_register_callback(NULL, &o2net_hb_up); |
98211489 | 1745 | if (ret == 0) |
14829422 | 1746 | ret = o2hb_register_callback(NULL, &o2net_hb_down); |
98211489 ZB |
1747 | |
1748 | if (ret) | |
1749 | o2net_unregister_hb_callbacks(); | |
1750 | ||
1751 | return ret; | |
1752 | } | |
1753 | ||
1754 | /* ------------------------------------------------------------ */ | |
1755 | ||
1756 | static int o2net_accept_one(struct socket *sock) | |
1757 | { | |
1758 | int ret, slen; | |
1759 | struct sockaddr_in sin; | |
1760 | struct socket *new_sock = NULL; | |
1761 | struct o2nm_node *node = NULL; | |
1762 | struct o2net_sock_container *sc = NULL; | |
1763 | struct o2net_node *nn; | |
1764 | ||
1765 | BUG_ON(sock == NULL); | |
1766 | ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, | |
1767 | sock->sk->sk_protocol, &new_sock); | |
1768 | if (ret) | |
1769 | goto out; | |
1770 | ||
1771 | new_sock->type = sock->type; | |
1772 | new_sock->ops = sock->ops; | |
1773 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); | |
1774 | if (ret < 0) | |
1775 | goto out; | |
1776 | ||
1777 | new_sock->sk->sk_allocation = GFP_ATOMIC; | |
1778 | ||
1779 | ret = o2net_set_nodelay(new_sock); | |
1780 | if (ret) { | |
1781 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); | |
1782 | goto out; | |
1783 | } | |
1784 | ||
1785 | slen = sizeof(sin); | |
1786 | ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, | |
1787 | &slen, 1); | |
1788 | if (ret < 0) | |
1789 | goto out; | |
1790 | ||
97bd7919 | 1791 | node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); |
98211489 | 1792 | if (node == NULL) { |
be859405 HH |
1793 | mlog(ML_NOTICE, "attempt to connect from unknown node at %pI4:%d\n", |
1794 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); | |
98211489 ZB |
1795 | ret = -EINVAL; |
1796 | goto out; | |
1797 | } | |
1798 | ||
1799 | if (o2nm_this_node() > node->nd_num) { | |
1800 | mlog(ML_NOTICE, "unexpected connect attempted from a lower " | |
be859405 HH |
1801 | "numbered node '%s' at " "%pI4:%d with num %u\n", |
1802 | node->nd_name, &sin.sin_addr.s_addr, | |
97bd7919 | 1803 | ntohs(sin.sin_port), node->nd_num); |
98211489 ZB |
1804 | ret = -EINVAL; |
1805 | goto out; | |
1806 | } | |
1807 | ||
1808 | /* this happens all the time when the other node sees our heartbeat | |
1809 | * and tries to connect before we see their heartbeat */ | |
1810 | if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { | |
1811 | mlog(ML_CONN, "attempt to connect from node '%s' at " | |
be859405 HH |
1812 | "%pI4:%d but it isn't heartbeating\n", |
1813 | node->nd_name, &sin.sin_addr.s_addr, | |
97bd7919 | 1814 | ntohs(sin.sin_port)); |
98211489 ZB |
1815 | ret = -EINVAL; |
1816 | goto out; | |
1817 | } | |
1818 | ||
1819 | nn = o2net_nn_from_num(node->nd_num); | |
1820 | ||
1821 | spin_lock(&nn->nn_lock); | |
1822 | if (nn->nn_sc) | |
1823 | ret = -EBUSY; | |
1824 | else | |
1825 | ret = 0; | |
1826 | spin_unlock(&nn->nn_lock); | |
1827 | if (ret) { | |
1828 | mlog(ML_NOTICE, "attempt to connect from node '%s' at " | |
be859405 HH |
1829 | "%pI4:%d but it already has an open connection\n", |
1830 | node->nd_name, &sin.sin_addr.s_addr, | |
97bd7919 | 1831 | ntohs(sin.sin_port)); |
98211489 ZB |
1832 | goto out; |
1833 | } | |
1834 | ||
1835 | sc = sc_alloc(node); | |
1836 | if (sc == NULL) { | |
1837 | ret = -ENOMEM; | |
1838 | goto out; | |
1839 | } | |
1840 | ||
1841 | sc->sc_sock = new_sock; | |
1842 | new_sock = NULL; | |
1843 | ||
1844 | spin_lock(&nn->nn_lock); | |
5cc3bf27 | 1845 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1846 | o2net_set_nn_state(nn, sc, 0, 0); |
1847 | spin_unlock(&nn->nn_lock); | |
1848 | ||
1849 | o2net_register_callbacks(sc->sc_sock->sk, sc); | |
1850 | o2net_sc_queue_work(sc, &sc->sc_rx_work); | |
1851 | ||
828ae6af | 1852 | o2net_initialize_handshake(); |
98211489 ZB |
1853 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1854 | ||
1855 | out: | |
1856 | if (new_sock) | |
1857 | sock_release(new_sock); | |
1858 | if (node) | |
1859 | o2nm_node_put(node); | |
1860 | if (sc) | |
1861 | sc_put(sc); | |
1862 | return ret; | |
1863 | } | |
1864 | ||
c4028958 | 1865 | static void o2net_accept_many(struct work_struct *work) |
98211489 | 1866 | { |
c4028958 | 1867 | struct socket *sock = o2net_listen_sock; |
98211489 ZB |
1868 | while (o2net_accept_one(sock) == 0) |
1869 | cond_resched(); | |
1870 | } | |
1871 | ||
1872 | static void o2net_listen_data_ready(struct sock *sk, int bytes) | |
1873 | { | |
1874 | void (*ready)(struct sock *sk, int bytes); | |
1875 | ||
1876 | read_lock(&sk->sk_callback_lock); | |
1877 | ready = sk->sk_user_data; | |
1878 | if (ready == NULL) { /* check for teardown race */ | |
1879 | ready = sk->sk_data_ready; | |
1880 | goto out; | |
1881 | } | |
1882 | ||
1883 | /* ->sk_data_ready is also called for a newly established child socket | |
1884 | * before it has been accepted and the acceptor has set up their | |
1885 | * data_ready.. we only want to queue listen work for our listening | |
1886 | * socket */ | |
1887 | if (sk->sk_state == TCP_LISTEN) { | |
1888 | mlog(ML_TCP, "bytes: %d\n", bytes); | |
1889 | queue_work(o2net_wq, &o2net_listen_work); | |
1890 | } | |
1891 | ||
1892 | out: | |
1893 | read_unlock(&sk->sk_callback_lock); | |
1894 | ready(sk, bytes); | |
1895 | } | |
1896 | ||
ab81afd3 | 1897 | static int o2net_open_listening_sock(__be32 addr, __be16 port) |
98211489 ZB |
1898 | { |
1899 | struct socket *sock = NULL; | |
1900 | int ret; | |
1901 | struct sockaddr_in sin = { | |
1902 | .sin_family = PF_INET, | |
5fdf1e67 MF |
1903 | .sin_addr = { .s_addr = addr }, |
1904 | .sin_port = port, | |
98211489 ZB |
1905 | }; |
1906 | ||
1907 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1908 | if (ret < 0) { | |
1909 | mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret); | |
1910 | goto out; | |
1911 | } | |
1912 | ||
1913 | sock->sk->sk_allocation = GFP_ATOMIC; | |
1914 | ||
1915 | write_lock_bh(&sock->sk->sk_callback_lock); | |
1916 | sock->sk->sk_user_data = sock->sk->sk_data_ready; | |
1917 | sock->sk->sk_data_ready = o2net_listen_data_ready; | |
1918 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
1919 | ||
1920 | o2net_listen_sock = sock; | |
c4028958 | 1921 | INIT_WORK(&o2net_listen_work, o2net_accept_many); |
98211489 ZB |
1922 | |
1923 | sock->sk->sk_reuse = 1; | |
1924 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); | |
1925 | if (ret < 0) { | |
be859405 HH |
1926 | mlog(ML_ERROR, "unable to bind socket at %pI4:%u, " |
1927 | "ret=%d\n", &addr, ntohs(port), ret); | |
98211489 ZB |
1928 | goto out; |
1929 | } | |
1930 | ||
1931 | ret = sock->ops->listen(sock, 64); | |
1932 | if (ret < 0) { | |
be859405 HH |
1933 | mlog(ML_ERROR, "unable to listen on %pI4:%u, ret=%d\n", |
1934 | &addr, ntohs(port), ret); | |
98211489 ZB |
1935 | } |
1936 | ||
1937 | out: | |
1938 | if (ret) { | |
1939 | o2net_listen_sock = NULL; | |
1940 | if (sock) | |
1941 | sock_release(sock); | |
1942 | } | |
1943 | return ret; | |
1944 | } | |
1945 | ||
1946 | /* | |
1947 | * called from node manager when we should bring up our network listening | |
1948 | * socket. node manager handles all the serialization to only call this | |
1949 | * once and to match it with o2net_stop_listening(). note, | |
1950 | * o2nm_this_node() doesn't work yet as we're being called while it | |
1951 | * is being set up. | |
1952 | */ | |
1953 | int o2net_start_listening(struct o2nm_node *node) | |
1954 | { | |
1955 | int ret = 0; | |
1956 | ||
1957 | BUG_ON(o2net_wq != NULL); | |
1958 | BUG_ON(o2net_listen_sock != NULL); | |
1959 | ||
1960 | mlog(ML_KTHREAD, "starting o2net thread...\n"); | |
1961 | o2net_wq = create_singlethread_workqueue("o2net"); | |
1962 | if (o2net_wq == NULL) { | |
1963 | mlog(ML_ERROR, "unable to launch o2net thread\n"); | |
1964 | return -ENOMEM; /* ? */ | |
1965 | } | |
1966 | ||
ab81afd3 SM |
1967 | ret = o2net_open_listening_sock(node->nd_ipv4_address, |
1968 | node->nd_ipv4_port); | |
98211489 ZB |
1969 | if (ret) { |
1970 | destroy_workqueue(o2net_wq); | |
1971 | o2net_wq = NULL; | |
1972 | } else | |
1973 | o2quo_conn_up(node->nd_num); | |
1974 | ||
1975 | return ret; | |
1976 | } | |
1977 | ||
1978 | /* again, o2nm_this_node() doesn't work here as we're involved in | |
1979 | * tearing it down */ | |
1980 | void o2net_stop_listening(struct o2nm_node *node) | |
1981 | { | |
1982 | struct socket *sock = o2net_listen_sock; | |
1983 | size_t i; | |
1984 | ||
1985 | BUG_ON(o2net_wq == NULL); | |
1986 | BUG_ON(o2net_listen_sock == NULL); | |
1987 | ||
1988 | /* stop the listening socket from generating work */ | |
1989 | write_lock_bh(&sock->sk->sk_callback_lock); | |
1990 | sock->sk->sk_data_ready = sock->sk->sk_user_data; | |
1991 | sock->sk->sk_user_data = NULL; | |
1992 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
1993 | ||
1994 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { | |
1995 | struct o2nm_node *node = o2nm_get_node_by_num(i); | |
1996 | if (node) { | |
1997 | o2net_disconnect_node(node); | |
1998 | o2nm_node_put(node); | |
1999 | } | |
2000 | } | |
2001 | ||
2002 | /* finish all work and tear down the work queue */ | |
2003 | mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); | |
2004 | destroy_workqueue(o2net_wq); | |
2005 | o2net_wq = NULL; | |
2006 | ||
2007 | sock_release(o2net_listen_sock); | |
2008 | o2net_listen_sock = NULL; | |
2009 | ||
2010 | o2quo_conn_err(node->nd_num); | |
2011 | } | |
2012 | ||
2013 | /* ------------------------------------------------------------ */ | |
2014 | ||
2015 | int o2net_init(void) | |
2016 | { | |
2017 | unsigned long i; | |
2018 | ||
2019 | o2quo_init(); | |
2020 | ||
2309e9e0 SM |
2021 | if (o2net_debugfs_init()) |
2022 | return -ENOMEM; | |
2023 | ||
cd861280 RD |
2024 | o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); |
2025 | o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); | |
2026 | o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); | |
98211489 ZB |
2027 | if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) { |
2028 | kfree(o2net_hand); | |
2029 | kfree(o2net_keep_req); | |
2030 | kfree(o2net_keep_resp); | |
2031 | return -ENOMEM; | |
2032 | } | |
2033 | ||
2034 | o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); | |
2035 | o2net_hand->connector_id = cpu_to_be64(1); | |
2036 | ||
2037 | o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); | |
2038 | o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); | |
2039 | ||
2040 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { | |
2041 | struct o2net_node *nn = o2net_nn_from_num(i); | |
2042 | ||
5cc3bf27 | 2043 | atomic_set(&nn->nn_timeout, 0); |
98211489 | 2044 | spin_lock_init(&nn->nn_lock); |
c4028958 DH |
2045 | INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); |
2046 | INIT_DELAYED_WORK(&nn->nn_connect_expired, | |
2047 | o2net_connect_expired); | |
2048 | INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); | |
98211489 ZB |
2049 | /* until we see hb from a node we'll return einval */ |
2050 | nn->nn_persistent_error = -ENOTCONN; | |
2051 | init_waitqueue_head(&nn->nn_sc_wq); | |
2052 | idr_init(&nn->nn_status_idr); | |
2053 | INIT_LIST_HEAD(&nn->nn_status_list); | |
2054 | } | |
2055 | ||
2056 | return 0; | |
2057 | } | |
2058 | ||
2059 | void o2net_exit(void) | |
2060 | { | |
2061 | o2quo_exit(); | |
2062 | kfree(o2net_hand); | |
2063 | kfree(o2net_keep_req); | |
2064 | kfree(o2net_keep_resp); | |
2309e9e0 | 2065 | o2net_debugfs_exit(); |
98211489 | 2066 | } |