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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 | ||
ff1becbf | 156 | static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) |
2309e9e0 | 157 | { |
3f9c14fa | 158 | nst->st_sock_time = ktime_get(); |
2309e9e0 SM |
159 | } |
160 | ||
ff1becbf | 161 | static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) |
2309e9e0 | 162 | { |
3f9c14fa | 163 | nst->st_send_time = ktime_get(); |
2309e9e0 SM |
164 | } |
165 | ||
ff1becbf | 166 | static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) |
2309e9e0 | 167 | { |
3f9c14fa | 168 | nst->st_status_time = ktime_get(); |
2309e9e0 SM |
169 | } |
170 | ||
ff1becbf SM |
171 | static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, |
172 | struct o2net_sock_container *sc) | |
2309e9e0 | 173 | { |
2309e9e0 | 174 | nst->st_sc = sc; |
2309e9e0 SM |
175 | } |
176 | ||
ff1becbf SM |
177 | static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, |
178 | u32 msg_id) | |
2309e9e0 | 179 | { |
2309e9e0 | 180 | nst->st_id = msg_id; |
2309e9e0 | 181 | } |
18496e80 | 182 | |
ff1becbf | 183 | static inline void o2net_set_sock_timer(struct o2net_sock_container *sc) |
18496e80 | 184 | { |
ff1becbf | 185 | sc->sc_tv_timer = ktime_get(); |
18496e80 AB |
186 | } |
187 | ||
ff1becbf | 188 | static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc) |
18496e80 | 189 | { |
ff1becbf | 190 | sc->sc_tv_data_ready = ktime_get(); |
18496e80 AB |
191 | } |
192 | ||
ff1becbf | 193 | static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc) |
18496e80 | 194 | { |
ff1becbf | 195 | sc->sc_tv_advance_start = ktime_get(); |
18496e80 AB |
196 | } |
197 | ||
ff1becbf | 198 | static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc) |
18496e80 | 199 | { |
ff1becbf | 200 | sc->sc_tv_advance_stop = ktime_get(); |
18496e80 AB |
201 | } |
202 | ||
ff1becbf | 203 | static inline void o2net_set_func_start_time(struct o2net_sock_container *sc) |
18496e80 | 204 | { |
ff1becbf | 205 | sc->sc_tv_func_start = ktime_get(); |
18496e80 AB |
206 | } |
207 | ||
ff1becbf | 208 | static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc) |
18496e80 | 209 | { |
ff1becbf | 210 | sc->sc_tv_func_stop = ktime_get(); |
18496e80 | 211 | } |
e453039f | 212 | |
ff1becbf SM |
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) | |
0f475b2a | 226 | #endif /* CONFIG_DEBUG_FS */ |
2309e9e0 | 227 | |
3c193b38 | 228 | #ifdef CONFIG_OCFS2_FS_STATS |
ed59992e RM |
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 | ||
3c193b38 SM |
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 | ||
e453039f SM |
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 | ||
3c193b38 SM |
256 | #else |
257 | ||
258 | # define o2net_update_send_stats(a, b) | |
259 | ||
e70d8450 RD |
260 | # define o2net_update_recv_stats(sc) |
261 | ||
3c193b38 SM |
262 | #endif /* CONFIG_OCFS2_FS_STATS */ |
263 | ||
409753bf | 264 | static inline int o2net_reconnect_delay(void) |
b5dd8030 JM |
265 | { |
266 | return o2nm_single_cluster->cl_reconnect_delay_ms; | |
267 | } | |
268 | ||
409753bf | 269 | static inline int o2net_keepalive_delay(void) |
b5dd8030 JM |
270 | { |
271 | return o2nm_single_cluster->cl_keepalive_delay_ms; | |
272 | } | |
273 | ||
409753bf | 274 | static inline int o2net_idle_timeout(void) |
b5dd8030 JM |
275 | { |
276 | return o2nm_single_cluster->cl_idle_timeout_ms; | |
277 | } | |
98211489 ZB |
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 | { | |
800deef3 | 370 | struct o2net_status_wait *nsw, *tmp; |
98211489 | 371 | unsigned int num_kills = 0; |
98211489 ZB |
372 | |
373 | assert_spin_locked(&nn->nn_lock); | |
374 | ||
800deef3 | 375 | list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { |
98211489 ZB |
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); | |
b5dd8030 JM |
400 | BUG_ON(timer_pending(&sc->sc_idle_timeout)); |
401 | ||
98211489 ZB |
402 | sclog(sc, "releasing\n"); |
403 | ||
404 | if (sc->sc_sock) { | |
405 | sock_release(sc->sc_sock); | |
406 | sc->sc_sock = NULL; | |
407 | } | |
408 | ||
2b190ce9 | 409 | o2nm_undepend_item(&sc->sc_node->nd_item); |
98211489 ZB |
410 | o2nm_node_put(sc->sc_node); |
411 | sc->sc_node = NULL; | |
412 | ||
2309e9e0 | 413 | o2net_debug_del_sc(sc); |
98211489 ZB |
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; | |
2b190ce9 | 431 | int status = 0; |
98211489 ZB |
432 | |
433 | page = alloc_page(GFP_NOFS); | |
cd861280 | 434 | sc = kzalloc(sizeof(*sc), GFP_NOFS); |
98211489 ZB |
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 | ||
2b190ce9 SM |
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 | } | |
c4028958 DH |
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); | |
98211489 ZB |
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; | |
2309e9e0 | 462 | o2net_debug_add_sc(sc); |
98211489 ZB |
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, | |
c4028958 | 484 | struct delayed_work *work, |
98211489 ZB |
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, | |
c4028958 | 492 | struct delayed_work *work) |
98211489 ZB |
493 | { |
494 | if (cancel_delayed_work(work)) | |
495 | sc_put(sc); | |
496 | } | |
497 | ||
828ae6af AB |
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 | ||
98211489 ZB |
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 | ||
828ae6af AB |
515 | if (old_sc && !sc) |
516 | atomic_dec(&o2net_connected_peers); | |
517 | else if (!old_sc && sc) | |
518 | atomic_inc(&o2net_connected_peers); | |
519 | ||
98211489 ZB |
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 | ||
98211489 ZB |
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) { | |
6efd8066 | 548 | printk(KERN_NOTICE "o2net: no longer connected to " |
781ee3e2 | 549 | SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); |
98211489 ZB |
550 | o2net_complete_nodes_nsw(nn); |
551 | } | |
552 | ||
553 | if (!was_valid && valid) { | |
554 | o2quo_conn_up(o2net_num_from_nn(nn)); | |
98211489 | 555 | cancel_delayed_work(&nn->nn_connect_expired); |
6efd8066 | 556 | printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", |
781ee3e2 SM |
557 | o2nm_this_node() > sc->sc_node->nd_num ? |
558 | "connected to" : "accepted connection from", | |
559 | SC_NODEF_ARGS(sc)); | |
98211489 ZB |
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 withing a RECONNECT_DELAY of the | |
569 | * last attempt */ | |
570 | delay = (nn->nn_last_connect_attempt + | |
409753bf | 571 | msecs_to_jiffies(o2net_reconnect_delay())) |
98211489 | 572 | - jiffies; |
409753bf | 573 | if (delay > msecs_to_jiffies(o2net_reconnect_delay())) |
98211489 ZB |
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); | |
5cc3bf27 TM |
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 | */ | |
409753bf | 587 | delay += msecs_to_jiffies(o2net_idle_timeout()); |
5cc3bf27 | 588 | queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); |
98211489 ZB |
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"); | |
ff1becbf | 609 | o2net_set_data_ready_time(sc); |
98211489 ZB |
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: | |
23fd9abd SE |
646 | printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT |
647 | " shutdown, state %d\n", | |
648 | SC_NODEF_ARGS(sc), sk->sk_state); | |
98211489 ZB |
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 | ||
925037bc ZW |
682 | mutex_init(&sc->sc_send_lock); |
683 | ||
98211489 ZB |
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 | */ | |
c4028958 | 728 | static void o2net_shutdown_sc(struct work_struct *work) |
98211489 | 729 | { |
c4028958 DH |
730 | struct o2net_sock_container *sc = |
731 | container_of(work, struct o2net_sock_container, | |
732 | sc_shutdown_work); | |
98211489 ZB |
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); | |
91cf45f0 | 744 | kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); |
98211489 ZB |
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, | |
d74c9803 | 815 | o2net_post_msg_handler_func *post_func, |
98211489 ZB |
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 | ||
cd861280 | 842 | nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); |
98211489 ZB |
843 | if (nmh == NULL) { |
844 | ret = -ENOMEM; | |
845 | goto out; | |
846 | } | |
847 | ||
848 | nmh->nh_func = func; | |
849 | nmh->nh_func_data = data; | |
d74c9803 | 850 | nmh->nh_post_func = post_func; |
98211489 ZB |
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 | { | |
800deef3 | 889 | struct o2net_msg_handler *nmh, *n; |
98211489 ZB |
890 | |
891 | write_lock(&o2net_handler_lock); | |
800deef3 | 892 | list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { |
98211489 ZB |
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 | ||
ce17204a SM |
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 | } | |
2bd63216 | 996 | mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT |
98211489 ZB |
997 | " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); |
998 | o2net_ensure_shutdown(nn, sc, 0); | |
ce17204a | 999 | break; |
98211489 ZB |
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 | { | |
50aff040 | 1040 | int ret = 0; |
98211489 ZB |
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 | }; | |
2309e9e0 SM |
1049 | struct o2net_send_tracking nst; |
1050 | ||
1051 | o2net_init_nst(&nst, msg_type, key, current, target_node); | |
98211489 ZB |
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 | ||
2309e9e0 SM |
1077 | o2net_debug_add_nst(&nst); |
1078 | ||
1079 | o2net_set_nst_sock_time(&nst); | |
1080 | ||
9af0b38f | 1081 | wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); |
98211489 ZB |
1082 | if (ret) |
1083 | goto out; | |
1084 | ||
2309e9e0 SM |
1085 | o2net_set_nst_sock_container(&nst, sc); |
1086 | ||
98211489 ZB |
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); | |
2309e9e0 SM |
1113 | o2net_set_nst_msg_id(&nst, nsw.ns_id); |
1114 | ||
1115 | o2net_set_nst_send_time(&nst); | |
98211489 ZB |
1116 | |
1117 | /* finally, convert the message header to network byte-order | |
1118 | * and send */ | |
925037bc | 1119 | mutex_lock(&sc->sc_send_lock); |
98211489 ZB |
1120 | ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, |
1121 | sizeof(struct o2net_msg) + caller_bytes); | |
925037bc | 1122 | mutex_unlock(&sc->sc_send_lock); |
98211489 ZB |
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 */ | |
2309e9e0 | 1130 | o2net_set_nst_status_time(&nst); |
98211489 ZB |
1131 | wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); |
1132 | ||
3c193b38 SM |
1133 | o2net_update_send_stats(&nst, sc); |
1134 | ||
98211489 ZB |
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: | |
2309e9e0 | 1145 | o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ |
98211489 ZB |
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; | |
d74c9803 | 1200 | void *ret_data = NULL; |
98211489 ZB |
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 | ||
ff1becbf | 1248 | o2net_set_func_start_time(sc); |
98211489 ZB |
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), | |
d74c9803 | 1253 | nmh->nh_func_data, &ret_data); |
ff1becbf | 1254 | o2net_set_func_stop_time(sc); |
98211489 | 1255 | |
e453039f SM |
1256 | o2net_update_recv_stats(sc); |
1257 | ||
98211489 ZB |
1258 | out_respond: |
1259 | /* this destroys the hdr, so don't use it after this */ | |
925037bc | 1260 | mutex_lock(&sc->sc_send_lock); |
98211489 ZB |
1261 | ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, |
1262 | handler_status); | |
925037bc | 1263 | mutex_unlock(&sc->sc_send_lock); |
98211489 ZB |
1264 | hdr = NULL; |
1265 | mlog(0, "sending handler status %d, syserr %d returned %d\n", | |
1266 | handler_status, syserr, ret); | |
1267 | ||
d74c9803 KH |
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 | ||
98211489 ZB |
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 | ||
828ae6af AB |
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) != | |
409753bf | 1304 | o2net_idle_timeout()) { |
828ae6af AB |
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), | |
409753bf | 1309 | o2net_idle_timeout()); |
828ae6af AB |
1310 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1311 | return -1; | |
1312 | } | |
1313 | ||
1314 | if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != | |
409753bf | 1315 | o2net_keepalive_delay()) { |
828ae6af AB |
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), | |
409753bf | 1320 | o2net_keepalive_delay()); |
828ae6af AB |
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 | ||
98211489 ZB |
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) { | |
b5dd8030 | 1342 | o2net_sc_reset_idle_timer(sc); |
5cc3bf27 | 1343 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
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"); | |
ff1becbf | 1367 | o2net_set_advance_start_time(sc); |
98211489 | 1368 | |
828ae6af AB |
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 | ||
98211489 ZB |
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; | |
98211489 ZB |
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); | |
ff1becbf | 1442 | o2net_set_advance_stop_time(sc); |
98211489 ZB |
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. */ | |
c4028958 | 1449 | static void o2net_rx_until_empty(struct work_struct *work) |
98211489 | 1450 | { |
c4028958 DH |
1451 | struct o2net_sock_container *sc = |
1452 | container_of(work, struct o2net_sock_container, sc_rx_work); | |
98211489 ZB |
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 | ||
828ae6af AB |
1494 | static void o2net_initialize_handshake(void) |
1495 | { | |
1496 | o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( | |
1497 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
409753bf | 1498 | o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); |
828ae6af | 1499 | o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( |
409753bf | 1500 | o2net_keepalive_delay()); |
828ae6af | 1501 | o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( |
409753bf | 1502 | o2net_reconnect_delay()); |
828ae6af AB |
1503 | } |
1504 | ||
98211489 ZB |
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 */ | |
c4028958 | 1509 | static void o2net_sc_connect_completed(struct work_struct *work) |
98211489 | 1510 | { |
c4028958 DH |
1511 | struct o2net_sock_container *sc = |
1512 | container_of(work, struct o2net_sock_container, | |
1513 | sc_connect_work); | |
98211489 ZB |
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 | ||
828ae6af | 1519 | o2net_initialize_handshake(); |
98211489 ZB |
1520 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1521 | sc_put(sc); | |
1522 | } | |
1523 | ||
1524 | /* this is called as a work_struct func. */ | |
c4028958 | 1525 | static void o2net_sc_send_keep_req(struct work_struct *work) |
98211489 | 1526 | { |
c4028958 DH |
1527 | struct o2net_sock_container *sc = |
1528 | container_of(work, struct o2net_sock_container, | |
1529 | sc_keepalive_work.work); | |
98211489 ZB |
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; | |
5cc3bf27 | 1541 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
98211489 | 1542 | |
ff1becbf SM |
1543 | #ifdef CONFIG_DEBUG_FS |
1544 | ktime_t now = ktime_get(); | |
1545 | #endif | |
98211489 | 1546 | |
6efd8066 | 1547 | printk(KERN_NOTICE "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u " |
b5dd8030 | 1548 | "seconds, shutting it down.\n", SC_NODEF_ARGS(sc), |
409753bf JM |
1549 | o2net_idle_timeout() / 1000, |
1550 | o2net_idle_timeout() % 1000); | |
ff1becbf SM |
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), | |
98211489 | 1560 | sc->sc_msg_key, sc->sc_msg_type, |
ff1becbf SM |
1561 | (long long)ktime_to_us(sc->sc_tv_func_start), |
1562 | (long long)ktime_to_us(sc->sc_tv_func_stop)); | |
1563 | #endif | |
98211489 | 1564 | |
5cc3bf27 TM |
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 | ||
98211489 ZB |
1571 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
1572 | } | |
1573 | ||
b5dd8030 | 1574 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) |
98211489 ZB |
1575 | { |
1576 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); | |
1577 | o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, | |
409753bf | 1578 | msecs_to_jiffies(o2net_keepalive_delay())); |
ff1becbf | 1579 | o2net_set_sock_timer(sc); |
98211489 | 1580 | mod_timer(&sc->sc_idle_timeout, |
409753bf | 1581 | jiffies + msecs_to_jiffies(o2net_idle_timeout())); |
b5dd8030 JM |
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); | |
98211489 ZB |
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 */ | |
c4028958 | 1596 | static void o2net_start_connect(struct work_struct *work) |
98211489 | 1597 | { |
c4028958 DH |
1598 | struct o2net_node *nn = |
1599 | container_of(work, struct o2net_node, nn_connect_work.work); | |
98211489 | 1600 | struct o2net_sock_container *sc = NULL; |
b7668c72 | 1601 | struct o2nm_node *node = NULL, *mynode = NULL; |
98211489 ZB |
1602 | struct socket *sock = NULL; |
1603 | struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; | |
c4028958 | 1604 | int ret = 0, stop; |
5cc3bf27 | 1605 | unsigned int timeout; |
98211489 ZB |
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 | ||
b7668c72 SM |
1618 | mynode = o2nm_get_node_by_num(o2nm_this_node()); |
1619 | if (mynode == NULL) { | |
1620 | ret = 0; | |
1621 | goto out; | |
1622 | } | |
1623 | ||
98211489 | 1624 | spin_lock(&nn->nn_lock); |
5cc3bf27 TM |
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))); | |
98211489 | 1636 | spin_unlock(&nn->nn_lock); |
c4028958 | 1637 | if (stop) |
98211489 ZB |
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; | |
5fdf1e67 | 1659 | myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; |
97bd7919 | 1660 | myaddr.sin_port = htons(0); /* any port */ |
98211489 ZB |
1661 | |
1662 | ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, | |
1663 | sizeof(myaddr)); | |
1664 | if (ret) { | |
be859405 HH |
1665 | mlog(ML_ERROR, "bind failed with %d at address %pI4\n", |
1666 | ret, &mynode->nd_ipv4_address); | |
98211489 ZB |
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; | |
5fdf1e67 MF |
1684 | remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; |
1685 | remoteaddr.sin_port = node->nd_ipv4_port; | |
98211489 ZB |
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); | |
b7668c72 SM |
1707 | if (mynode) |
1708 | o2nm_node_put(mynode); | |
98211489 ZB |
1709 | |
1710 | return; | |
1711 | } | |
1712 | ||
c4028958 | 1713 | static void o2net_connect_expired(struct work_struct *work) |
98211489 | 1714 | { |
c4028958 DH |
1715 | struct o2net_node *nn = |
1716 | container_of(work, struct o2net_node, nn_connect_expired.work); | |
98211489 ZB |
1717 | |
1718 | spin_lock(&nn->nn_lock); | |
1719 | if (!nn->nn_sc_valid) { | |
1720 | mlog(ML_ERROR, "no connection established with node %u after " | |
b5dd8030 JM |
1721 | "%u.%u seconds, giving up and returning errors.\n", |
1722 | o2net_num_from_nn(nn), | |
409753bf JM |
1723 | o2net_idle_timeout() / 1000, |
1724 | o2net_idle_timeout() % 1000); | |
98211489 ZB |
1725 | |
1726 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); | |
1727 | } | |
1728 | spin_unlock(&nn->nn_lock); | |
1729 | } | |
1730 | ||
c4028958 | 1731 | static void o2net_still_up(struct work_struct *work) |
98211489 | 1732 | { |
c4028958 DH |
1733 | struct o2net_node *nn = |
1734 | container_of(work, struct o2net_node, nn_still_up.work); | |
98211489 ZB |
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); | |
5cc3bf27 | 1747 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
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 | ||
0e105d37 SM |
1764 | if (!node) |
1765 | return; | |
1766 | ||
98211489 ZB |
1767 | if (node_num != o2nm_this_node()) |
1768 | o2net_disconnect_node(node); | |
828ae6af AB |
1769 | |
1770 | BUG_ON(atomic_read(&o2net_connected_peers) < 0); | |
98211489 ZB |
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 | ||
0e105d37 SM |
1780 | BUG_ON(!node); |
1781 | ||
98211489 ZB |
1782 | /* ensure an immediate connect attempt */ |
1783 | nn->nn_last_connect_attempt = jiffies - | |
409753bf | 1784 | (msecs_to_jiffies(o2net_reconnect_delay()) + 1); |
98211489 ZB |
1785 | |
1786 | if (node_num != o2nm_this_node()) { | |
98211489 ZB |
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); | |
5cc3bf27 | 1792 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
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 | { | |
14829422 JB |
1801 | o2hb_unregister_callback(NULL, &o2net_hb_up); |
1802 | o2hb_unregister_callback(NULL, &o2net_hb_down); | |
98211489 ZB |
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 | ||
14829422 | 1814 | ret = o2hb_register_callback(NULL, &o2net_hb_up); |
98211489 | 1815 | if (ret == 0) |
14829422 | 1816 | ret = o2hb_register_callback(NULL, &o2net_hb_down); |
98211489 ZB |
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; | |
415cf32c | 1832 | struct o2nm_node *local_node = NULL; |
98211489 ZB |
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 | ||
97bd7919 | 1862 | node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); |
98211489 | 1863 | if (node == NULL) { |
be859405 HH |
1864 | mlog(ML_NOTICE, "attempt to connect from unknown node at %pI4:%d\n", |
1865 | &sin.sin_addr.s_addr, ntohs(sin.sin_port)); | |
98211489 ZB |
1866 | ret = -EINVAL; |
1867 | goto out; | |
1868 | } | |
1869 | ||
415cf32c TY |
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)); | |
98211489 ZB |
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 " | |
be859405 HH |
1887 | "%pI4:%d but it isn't heartbeating\n", |
1888 | node->nd_name, &sin.sin_addr.s_addr, | |
97bd7919 | 1889 | ntohs(sin.sin_port)); |
98211489 ZB |
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 " | |
be859405 HH |
1904 | "%pI4:%d but it already has an open connection\n", |
1905 | node->nd_name, &sin.sin_addr.s_addr, | |
97bd7919 | 1906 | ntohs(sin.sin_port)); |
98211489 ZB |
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); | |
5cc3bf27 | 1920 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
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 | ||
828ae6af | 1927 | o2net_initialize_handshake(); |
98211489 ZB |
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); | |
415cf32c TY |
1935 | if (local_node) |
1936 | o2nm_node_put(local_node); | |
98211489 ZB |
1937 | if (sc) |
1938 | sc_put(sc); | |
1939 | return ret; | |
1940 | } | |
1941 | ||
c4028958 | 1942 | static void o2net_accept_many(struct work_struct *work) |
98211489 | 1943 | { |
c4028958 | 1944 | struct socket *sock = o2net_listen_sock; |
98211489 ZB |
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 | ||
ab81afd3 | 1974 | static int o2net_open_listening_sock(__be32 addr, __be16 port) |
98211489 ZB |
1975 | { |
1976 | struct socket *sock = NULL; | |
1977 | int ret; | |
1978 | struct sockaddr_in sin = { | |
1979 | .sin_family = PF_INET, | |
5fdf1e67 MF |
1980 | .sin_addr = { .s_addr = addr }, |
1981 | .sin_port = port, | |
98211489 ZB |
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; | |
c4028958 | 1998 | INIT_WORK(&o2net_listen_work, o2net_accept_many); |
98211489 ZB |
1999 | |
2000 | sock->sk->sk_reuse = 1; | |
2001 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); | |
2002 | if (ret < 0) { | |
be859405 HH |
2003 | mlog(ML_ERROR, "unable to bind socket at %pI4:%u, " |
2004 | "ret=%d\n", &addr, ntohs(port), ret); | |
98211489 ZB |
2005 | goto out; |
2006 | } | |
2007 | ||
2008 | ret = sock->ops->listen(sock, 64); | |
2009 | if (ret < 0) { | |
be859405 HH |
2010 | mlog(ML_ERROR, "unable to listen on %pI4:%u, ret=%d\n", |
2011 | &addr, ntohs(port), ret); | |
98211489 ZB |
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 | ||
ab81afd3 SM |
2044 | ret = o2net_open_listening_sock(node->nd_ipv4_address, |
2045 | node->nd_ipv4_port); | |
98211489 ZB |
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 | ||
2309e9e0 SM |
2098 | if (o2net_debugfs_init()) |
2099 | return -ENOMEM; | |
2100 | ||
cd861280 RD |
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); | |
98211489 ZB |
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 | ||
5cc3bf27 | 2120 | atomic_set(&nn->nn_timeout, 0); |
98211489 | 2121 | spin_lock_init(&nn->nn_lock); |
c4028958 DH |
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); | |
98211489 ZB |
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); | |
2309e9e0 | 2142 | o2net_debugfs_exit(); |
98211489 | 2143 | } |