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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * | |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * Copyright (C) 2004 Oracle. All rights reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public | |
18 | * License along with this program; if not, write to the | |
19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | * Boston, MA 021110-1307, USA. | |
21 | * | |
22 | * ---- | |
23 | * | |
24 | * Callers for this were originally written against a very simple synchronus | |
25 | * API. This implementation reflects those simple callers. Some day I'm sure | |
26 | * we'll need to move to a more robust posting/callback mechanism. | |
27 | * | |
28 | * Transmit calls pass in kernel virtual addresses and block copying this into | |
29 | * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting | |
30 | * for a failed socket to timeout. TX callers can also pass in a poniter to an | |
31 | * 'int' which gets filled with an errno off the wire in response to the | |
32 | * message they send. | |
33 | * | |
34 | * Handlers for unsolicited messages are registered. Each socket has a page | |
35 | * that incoming data is copied into. First the header, then the data. | |
36 | * Handlers are called from only one thread with a reference to this per-socket | |
37 | * page. This page is destroyed after the handler call, so it can't be | |
38 | * referenced beyond the call. Handlers may block but are discouraged from | |
39 | * doing so. | |
40 | * | |
41 | * Any framing errors (bad magic, large payload lengths) close a connection. | |
42 | * | |
43 | * Our sock_container holds the state we associate with a socket. It's current | |
44 | * framing state is held there as well as the refcounting we do around when it | |
45 | * is safe to tear down the socket. The socket is only finally torn down from | |
46 | * the container when the container loses all of its references -- so as long | |
47 | * as you hold a ref on the container you can trust that the socket is valid | |
48 | * for use with kernel socket APIs. | |
49 | * | |
50 | * Connections are initiated between a pair of nodes when the node with the | |
51 | * higher node number gets a heartbeat callback which indicates that the lower | |
52 | * numbered node has started heartbeating. The lower numbered node is passive | |
53 | * and only accepts the connection if the higher numbered node is heartbeating. | |
54 | */ | |
55 | ||
56 | #include <linux/kernel.h> | |
5b3cc15a | 57 | #include <linux/sched/mm.h> |
98211489 ZB |
58 | #include <linux/jiffies.h> |
59 | #include <linux/slab.h> | |
60 | #include <linux/idr.h> | |
61 | #include <linux/kref.h> | |
91cf45f0 | 62 | #include <linux/net.h> |
afeacc8c | 63 | #include <linux/export.h> |
98211489 ZB |
64 | #include <net/tcp.h> |
65 | ||
7c0f6ba6 | 66 | #include <linux/uaccess.h> |
98211489 ZB |
67 | |
68 | #include "heartbeat.h" | |
69 | #include "tcp.h" | |
70 | #include "nodemanager.h" | |
71 | #define MLOG_MASK_PREFIX ML_TCP | |
72 | #include "masklog.h" | |
73 | #include "quorum.h" | |
74 | ||
75 | #include "tcp_internal.h" | |
76 | ||
03affdef | 77 | #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" |
98211489 | 78 | #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ |
03affdef | 79 | &sc->sc_node->nd_ipv4_address, \ |
98211489 ZB |
80 | ntohs(sc->sc_node->nd_ipv4_port) |
81 | ||
82 | /* | |
83 | * In the following two log macros, the whitespace after the ',' just | |
84 | * before ##args is intentional. Otherwise, gcc 2.95 will eat the | |
85 | * previous token if args expands to nothing. | |
86 | */ | |
87 | #define msglog(hdr, fmt, args...) do { \ | |
88 | typeof(hdr) __hdr = (hdr); \ | |
89 | mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ | |
90 | "key %08x num %u] " fmt, \ | |
91 | be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ | |
92 | be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ | |
93 | be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ | |
94 | be32_to_cpu(__hdr->msg_num) , ##args); \ | |
95 | } while (0) | |
96 | ||
97 | #define sclog(sc, fmt, args...) do { \ | |
98 | typeof(sc) __sc = (sc); \ | |
99 | mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ | |
100 | "pg_off %zu] " fmt, __sc, \ | |
2c935bc5 | 101 | kref_read(&__sc->sc_kref), __sc->sc_sock, \ |
98211489 ZB |
102 | __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ |
103 | ##args); \ | |
104 | } while (0) | |
105 | ||
34af946a | 106 | static DEFINE_RWLOCK(o2net_handler_lock); |
98211489 ZB |
107 | static struct rb_root o2net_handler_tree = RB_ROOT; |
108 | ||
109 | static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; | |
110 | ||
111 | /* XXX someday we'll need better accounting */ | |
1a5c4e2a | 112 | static struct socket *o2net_listen_sock; |
98211489 ZB |
113 | |
114 | /* | |
115 | * listen work is only queued by the listening socket callbacks on the | |
116 | * o2net_wq. teardown detaches the callbacks before destroying the workqueue. | |
117 | * quorum work is queued as sock containers are shutdown.. stop_listening | |
118 | * tears down all the node's sock containers, preventing future shutdowns | |
119 | * and queued quroum work, before canceling delayed quorum work and | |
120 | * destroying the work queue. | |
121 | */ | |
122 | static struct workqueue_struct *o2net_wq; | |
123 | static struct work_struct o2net_listen_work; | |
124 | ||
125 | static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; | |
126 | #define O2NET_HB_PRI 0x1 | |
127 | ||
128 | static struct o2net_handshake *o2net_hand; | |
129 | static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; | |
130 | ||
131 | static int o2net_sys_err_translations[O2NET_ERR_MAX] = | |
132 | {[O2NET_ERR_NONE] = 0, | |
133 | [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, | |
134 | [O2NET_ERR_OVERFLOW] = -EOVERFLOW, | |
135 | [O2NET_ERR_DIED] = -EHOSTDOWN,}; | |
136 | ||
137 | /* can't quite avoid *all* internal declarations :/ */ | |
c4028958 DH |
138 | static void o2net_sc_connect_completed(struct work_struct *work); |
139 | static void o2net_rx_until_empty(struct work_struct *work); | |
140 | static void o2net_shutdown_sc(struct work_struct *work); | |
676d2369 | 141 | static void o2net_listen_data_ready(struct sock *sk); |
c4028958 | 142 | static void o2net_sc_send_keep_req(struct work_struct *work); |
e99e88a9 | 143 | static void o2net_idle_timer(struct timer_list *t); |
98211489 | 144 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); |
b5dd8030 JM |
145 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); |
146 | ||
2309e9e0 | 147 | #ifdef CONFIG_DEBUG_FS |
18496e80 AB |
148 | static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, |
149 | u32 msgkey, struct task_struct *task, u8 node) | |
0f475b2a | 150 | { |
2309e9e0 SM |
151 | INIT_LIST_HEAD(&nst->st_net_debug_item); |
152 | nst->st_task = task; | |
153 | nst->st_msg_type = msgtype; | |
154 | nst->st_msg_key = msgkey; | |
155 | nst->st_node = node; | |
2309e9e0 SM |
156 | } |
157 | ||
ff1becbf | 158 | static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) |
2309e9e0 | 159 | { |
3f9c14fa | 160 | nst->st_sock_time = ktime_get(); |
2309e9e0 SM |
161 | } |
162 | ||
ff1becbf | 163 | static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) |
2309e9e0 | 164 | { |
3f9c14fa | 165 | nst->st_send_time = ktime_get(); |
2309e9e0 SM |
166 | } |
167 | ||
ff1becbf | 168 | static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) |
2309e9e0 | 169 | { |
3f9c14fa | 170 | nst->st_status_time = ktime_get(); |
2309e9e0 SM |
171 | } |
172 | ||
ff1becbf SM |
173 | static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, |
174 | struct o2net_sock_container *sc) | |
2309e9e0 | 175 | { |
2309e9e0 | 176 | nst->st_sc = sc; |
2309e9e0 SM |
177 | } |
178 | ||
ff1becbf SM |
179 | static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, |
180 | u32 msg_id) | |
2309e9e0 | 181 | { |
2309e9e0 | 182 | nst->st_id = msg_id; |
2309e9e0 | 183 | } |
18496e80 | 184 | |
ff1becbf | 185 | static inline void o2net_set_sock_timer(struct o2net_sock_container *sc) |
18496e80 | 186 | { |
ff1becbf | 187 | sc->sc_tv_timer = ktime_get(); |
18496e80 AB |
188 | } |
189 | ||
ff1becbf | 190 | static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc) |
18496e80 | 191 | { |
ff1becbf | 192 | sc->sc_tv_data_ready = ktime_get(); |
18496e80 AB |
193 | } |
194 | ||
ff1becbf | 195 | static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc) |
18496e80 | 196 | { |
ff1becbf | 197 | sc->sc_tv_advance_start = ktime_get(); |
18496e80 AB |
198 | } |
199 | ||
ff1becbf | 200 | static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc) |
18496e80 | 201 | { |
ff1becbf | 202 | sc->sc_tv_advance_stop = ktime_get(); |
18496e80 AB |
203 | } |
204 | ||
ff1becbf | 205 | static inline void o2net_set_func_start_time(struct o2net_sock_container *sc) |
18496e80 | 206 | { |
ff1becbf | 207 | sc->sc_tv_func_start = ktime_get(); |
18496e80 AB |
208 | } |
209 | ||
ff1becbf | 210 | static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc) |
18496e80 | 211 | { |
ff1becbf | 212 | sc->sc_tv_func_stop = ktime_get(); |
18496e80 | 213 | } |
e453039f | 214 | |
ff1becbf SM |
215 | #else /* CONFIG_DEBUG_FS */ |
216 | # define o2net_init_nst(a, b, c, d, e) | |
217 | # define o2net_set_nst_sock_time(a) | |
218 | # define o2net_set_nst_send_time(a) | |
219 | # define o2net_set_nst_status_time(a) | |
220 | # define o2net_set_nst_sock_container(a, b) | |
221 | # define o2net_set_nst_msg_id(a, b) | |
222 | # define o2net_set_sock_timer(a) | |
223 | # define o2net_set_data_ready_time(a) | |
224 | # define o2net_set_advance_start_time(a) | |
225 | # define o2net_set_advance_stop_time(a) | |
226 | # define o2net_set_func_start_time(a) | |
227 | # define o2net_set_func_stop_time(a) | |
0f475b2a | 228 | #endif /* CONFIG_DEBUG_FS */ |
2309e9e0 | 229 | |
3c193b38 | 230 | #ifdef CONFIG_OCFS2_FS_STATS |
ed59992e RM |
231 | static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc) |
232 | { | |
233 | return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); | |
234 | } | |
235 | ||
3c193b38 SM |
236 | static void o2net_update_send_stats(struct o2net_send_tracking *nst, |
237 | struct o2net_sock_container *sc) | |
238 | { | |
239 | sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, | |
240 | ktime_sub(ktime_get(), | |
241 | nst->st_status_time)); | |
242 | sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, | |
243 | ktime_sub(nst->st_status_time, | |
244 | nst->st_send_time)); | |
245 | sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, | |
246 | ktime_sub(nst->st_send_time, | |
247 | nst->st_sock_time)); | |
248 | sc->sc_send_count++; | |
249 | } | |
250 | ||
e453039f SM |
251 | static void o2net_update_recv_stats(struct o2net_sock_container *sc) |
252 | { | |
253 | sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, | |
254 | o2net_get_func_run_time(sc)); | |
255 | sc->sc_recv_count++; | |
256 | } | |
257 | ||
3c193b38 SM |
258 | #else |
259 | ||
260 | # define o2net_update_send_stats(a, b) | |
261 | ||
e70d8450 RD |
262 | # define o2net_update_recv_stats(sc) |
263 | ||
3c193b38 SM |
264 | #endif /* CONFIG_OCFS2_FS_STATS */ |
265 | ||
41b63efb | 266 | static inline unsigned int o2net_reconnect_delay(void) |
b5dd8030 JM |
267 | { |
268 | return o2nm_single_cluster->cl_reconnect_delay_ms; | |
269 | } | |
270 | ||
41b63efb | 271 | static inline unsigned int o2net_keepalive_delay(void) |
b5dd8030 JM |
272 | { |
273 | return o2nm_single_cluster->cl_keepalive_delay_ms; | |
274 | } | |
275 | ||
41b63efb | 276 | static inline unsigned int o2net_idle_timeout(void) |
b5dd8030 JM |
277 | { |
278 | return o2nm_single_cluster->cl_idle_timeout_ms; | |
279 | } | |
98211489 ZB |
280 | |
281 | static inline int o2net_sys_err_to_errno(enum o2net_system_error err) | |
282 | { | |
283 | int trans; | |
284 | BUG_ON(err >= O2NET_ERR_MAX); | |
285 | trans = o2net_sys_err_translations[err]; | |
286 | ||
287 | /* Just in case we mess up the translation table above */ | |
288 | BUG_ON(err != O2NET_ERR_NONE && trans == 0); | |
289 | return trans; | |
290 | } | |
291 | ||
292 | static struct o2net_node * o2net_nn_from_num(u8 node_num) | |
293 | { | |
294 | BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); | |
295 | return &o2net_nodes[node_num]; | |
296 | } | |
297 | ||
298 | static u8 o2net_num_from_nn(struct o2net_node *nn) | |
299 | { | |
300 | BUG_ON(nn == NULL); | |
301 | return nn - o2net_nodes; | |
302 | } | |
303 | ||
304 | /* ------------------------------------------------------------ */ | |
305 | ||
306 | static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) | |
307 | { | |
6b207ba3 TH |
308 | int ret; |
309 | ||
310 | spin_lock(&nn->nn_lock); | |
311 | ret = idr_alloc(&nn->nn_status_idr, nsw, 0, 0, GFP_ATOMIC); | |
312 | if (ret >= 0) { | |
313 | nsw->ns_id = ret; | |
314 | list_add_tail(&nsw->ns_node_item, &nn->nn_status_list); | |
98211489 | 315 | } |
6b207ba3 TH |
316 | spin_unlock(&nn->nn_lock); |
317 | if (ret < 0) | |
318 | return ret; | |
98211489 | 319 | |
6b207ba3 TH |
320 | init_waitqueue_head(&nsw->ns_wq); |
321 | nsw->ns_sys_status = O2NET_ERR_NONE; | |
322 | nsw->ns_status = 0; | |
323 | return 0; | |
98211489 ZB |
324 | } |
325 | ||
326 | static void o2net_complete_nsw_locked(struct o2net_node *nn, | |
327 | struct o2net_status_wait *nsw, | |
328 | enum o2net_system_error sys_status, | |
329 | s32 status) | |
330 | { | |
331 | assert_spin_locked(&nn->nn_lock); | |
332 | ||
333 | if (!list_empty(&nsw->ns_node_item)) { | |
334 | list_del_init(&nsw->ns_node_item); | |
335 | nsw->ns_sys_status = sys_status; | |
336 | nsw->ns_status = status; | |
337 | idr_remove(&nn->nn_status_idr, nsw->ns_id); | |
338 | wake_up(&nsw->ns_wq); | |
339 | } | |
340 | } | |
341 | ||
342 | static void o2net_complete_nsw(struct o2net_node *nn, | |
343 | struct o2net_status_wait *nsw, | |
344 | u64 id, enum o2net_system_error sys_status, | |
345 | s32 status) | |
346 | { | |
347 | spin_lock(&nn->nn_lock); | |
348 | if (nsw == NULL) { | |
349 | if (id > INT_MAX) | |
350 | goto out; | |
351 | ||
352 | nsw = idr_find(&nn->nn_status_idr, id); | |
353 | if (nsw == NULL) | |
354 | goto out; | |
355 | } | |
356 | ||
357 | o2net_complete_nsw_locked(nn, nsw, sys_status, status); | |
358 | ||
359 | out: | |
360 | spin_unlock(&nn->nn_lock); | |
361 | return; | |
362 | } | |
363 | ||
364 | static void o2net_complete_nodes_nsw(struct o2net_node *nn) | |
365 | { | |
800deef3 | 366 | struct o2net_status_wait *nsw, *tmp; |
98211489 | 367 | unsigned int num_kills = 0; |
98211489 ZB |
368 | |
369 | assert_spin_locked(&nn->nn_lock); | |
370 | ||
800deef3 | 371 | list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { |
98211489 ZB |
372 | o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); |
373 | num_kills++; | |
374 | } | |
375 | ||
376 | mlog(0, "completed %d messages for node %u\n", num_kills, | |
377 | o2net_num_from_nn(nn)); | |
378 | } | |
379 | ||
380 | static int o2net_nsw_completed(struct o2net_node *nn, | |
381 | struct o2net_status_wait *nsw) | |
382 | { | |
383 | int completed; | |
384 | spin_lock(&nn->nn_lock); | |
385 | completed = list_empty(&nsw->ns_node_item); | |
386 | spin_unlock(&nn->nn_lock); | |
387 | return completed; | |
388 | } | |
389 | ||
390 | /* ------------------------------------------------------------ */ | |
391 | ||
392 | static void sc_kref_release(struct kref *kref) | |
393 | { | |
394 | struct o2net_sock_container *sc = container_of(kref, | |
395 | struct o2net_sock_container, sc_kref); | |
b5dd8030 JM |
396 | BUG_ON(timer_pending(&sc->sc_idle_timeout)); |
397 | ||
98211489 ZB |
398 | sclog(sc, "releasing\n"); |
399 | ||
400 | if (sc->sc_sock) { | |
401 | sock_release(sc->sc_sock); | |
402 | sc->sc_sock = NULL; | |
403 | } | |
404 | ||
2b190ce9 | 405 | o2nm_undepend_item(&sc->sc_node->nd_item); |
98211489 ZB |
406 | o2nm_node_put(sc->sc_node); |
407 | sc->sc_node = NULL; | |
408 | ||
2309e9e0 | 409 | o2net_debug_del_sc(sc); |
d3e3b41b YL |
410 | |
411 | if (sc->sc_page) | |
412 | __free_page(sc->sc_page); | |
98211489 ZB |
413 | kfree(sc); |
414 | } | |
415 | ||
416 | static void sc_put(struct o2net_sock_container *sc) | |
417 | { | |
418 | sclog(sc, "put\n"); | |
419 | kref_put(&sc->sc_kref, sc_kref_release); | |
420 | } | |
421 | static void sc_get(struct o2net_sock_container *sc) | |
422 | { | |
423 | sclog(sc, "get\n"); | |
424 | kref_get(&sc->sc_kref); | |
425 | } | |
426 | static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) | |
427 | { | |
428 | struct o2net_sock_container *sc, *ret = NULL; | |
429 | struct page *page = NULL; | |
2b190ce9 | 430 | int status = 0; |
98211489 ZB |
431 | |
432 | page = alloc_page(GFP_NOFS); | |
cd861280 | 433 | sc = kzalloc(sizeof(*sc), GFP_NOFS); |
98211489 ZB |
434 | if (sc == NULL || page == NULL) |
435 | goto out; | |
436 | ||
437 | kref_init(&sc->sc_kref); | |
438 | o2nm_node_get(node); | |
439 | sc->sc_node = node; | |
440 | ||
2b190ce9 SM |
441 | /* pin the node item of the remote node */ |
442 | status = o2nm_depend_item(&node->nd_item); | |
443 | if (status) { | |
444 | mlog_errno(status); | |
445 | o2nm_node_put(node); | |
446 | goto out; | |
447 | } | |
c4028958 DH |
448 | INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); |
449 | INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); | |
450 | INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); | |
451 | INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); | |
98211489 | 452 | |
e99e88a9 | 453 | timer_setup(&sc->sc_idle_timeout, o2net_idle_timer, 0); |
98211489 ZB |
454 | |
455 | sclog(sc, "alloced\n"); | |
456 | ||
457 | ret = sc; | |
458 | sc->sc_page = page; | |
2309e9e0 | 459 | o2net_debug_add_sc(sc); |
98211489 ZB |
460 | sc = NULL; |
461 | page = NULL; | |
462 | ||
463 | out: | |
464 | if (page) | |
465 | __free_page(page); | |
466 | kfree(sc); | |
467 | ||
468 | return ret; | |
469 | } | |
470 | ||
471 | /* ------------------------------------------------------------ */ | |
472 | ||
473 | static void o2net_sc_queue_work(struct o2net_sock_container *sc, | |
474 | struct work_struct *work) | |
475 | { | |
476 | sc_get(sc); | |
477 | if (!queue_work(o2net_wq, work)) | |
478 | sc_put(sc); | |
479 | } | |
480 | static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, | |
c4028958 | 481 | struct delayed_work *work, |
98211489 ZB |
482 | int delay) |
483 | { | |
484 | sc_get(sc); | |
485 | if (!queue_delayed_work(o2net_wq, work, delay)) | |
486 | sc_put(sc); | |
487 | } | |
488 | static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, | |
c4028958 | 489 | struct delayed_work *work) |
98211489 ZB |
490 | { |
491 | if (cancel_delayed_work(work)) | |
492 | sc_put(sc); | |
493 | } | |
494 | ||
828ae6af AB |
495 | static atomic_t o2net_connected_peers = ATOMIC_INIT(0); |
496 | ||
497 | int o2net_num_connected_peers(void) | |
498 | { | |
499 | return atomic_read(&o2net_connected_peers); | |
500 | } | |
501 | ||
98211489 ZB |
502 | static void o2net_set_nn_state(struct o2net_node *nn, |
503 | struct o2net_sock_container *sc, | |
504 | unsigned valid, int err) | |
505 | { | |
506 | int was_valid = nn->nn_sc_valid; | |
507 | int was_err = nn->nn_persistent_error; | |
508 | struct o2net_sock_container *old_sc = nn->nn_sc; | |
509 | ||
510 | assert_spin_locked(&nn->nn_lock); | |
511 | ||
828ae6af AB |
512 | if (old_sc && !sc) |
513 | atomic_dec(&o2net_connected_peers); | |
514 | else if (!old_sc && sc) | |
515 | atomic_inc(&o2net_connected_peers); | |
516 | ||
98211489 ZB |
517 | /* the node num comparison and single connect/accept path should stop |
518 | * an non-null sc from being overwritten with another */ | |
519 | BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); | |
520 | mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); | |
521 | mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); | |
522 | ||
98211489 ZB |
523 | if (was_valid && !valid && err == 0) |
524 | err = -ENOTCONN; | |
525 | ||
526 | mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", | |
527 | o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, | |
528 | nn->nn_persistent_error, err); | |
529 | ||
530 | nn->nn_sc = sc; | |
531 | nn->nn_sc_valid = valid ? 1 : 0; | |
532 | nn->nn_persistent_error = err; | |
533 | ||
534 | /* mirrors o2net_tx_can_proceed() */ | |
535 | if (nn->nn_persistent_error || nn->nn_sc_valid) | |
536 | wake_up(&nn->nn_sc_wq); | |
537 | ||
5046f18d | 538 | if (was_valid && !was_err && nn->nn_persistent_error) { |
98211489 ZB |
539 | o2quo_conn_err(o2net_num_from_nn(nn)); |
540 | queue_delayed_work(o2net_wq, &nn->nn_still_up, | |
541 | msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); | |
542 | } | |
543 | ||
544 | if (was_valid && !valid) { | |
8dd7903e SM |
545 | if (old_sc) |
546 | printk(KERN_NOTICE "o2net: No longer connected to " | |
547 | SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); | |
98211489 ZB |
548 | o2net_complete_nodes_nsw(nn); |
549 | } | |
550 | ||
551 | if (!was_valid && valid) { | |
552 | o2quo_conn_up(o2net_num_from_nn(nn)); | |
98211489 | 553 | cancel_delayed_work(&nn->nn_connect_expired); |
6efd8066 | 554 | printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", |
781ee3e2 | 555 | o2nm_this_node() > sc->sc_node->nd_num ? |
1dfecf81 | 556 | "Connected to" : "Accepted connection from", |
781ee3e2 | 557 | SC_NODEF_ARGS(sc)); |
98211489 ZB |
558 | } |
559 | ||
560 | /* trigger the connecting worker func as long as we're not valid, | |
561 | * it will back off if it shouldn't connect. This can be called | |
562 | * from node config teardown and so needs to be careful about | |
563 | * the work queue actually being up. */ | |
564 | if (!valid && o2net_wq) { | |
565 | unsigned long delay; | |
25985edc | 566 | /* delay if we're within a RECONNECT_DELAY of the |
98211489 ZB |
567 | * last attempt */ |
568 | delay = (nn->nn_last_connect_attempt + | |
409753bf | 569 | msecs_to_jiffies(o2net_reconnect_delay())) |
98211489 | 570 | - jiffies; |
409753bf | 571 | if (delay > msecs_to_jiffies(o2net_reconnect_delay())) |
98211489 ZB |
572 | delay = 0; |
573 | mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); | |
574 | queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); | |
5cc3bf27 TM |
575 | |
576 | /* | |
577 | * Delay the expired work after idle timeout. | |
578 | * | |
579 | * We might have lots of failed connection attempts that run | |
580 | * through here but we only cancel the connect_expired work when | |
581 | * a connection attempt succeeds. So only the first enqueue of | |
582 | * the connect_expired work will do anything. The rest will see | |
583 | * that it's already queued and do nothing. | |
584 | */ | |
409753bf | 585 | delay += msecs_to_jiffies(o2net_idle_timeout()); |
5cc3bf27 | 586 | queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); |
98211489 ZB |
587 | } |
588 | ||
589 | /* keep track of the nn's sc ref for the caller */ | |
590 | if ((old_sc == NULL) && sc) | |
591 | sc_get(sc); | |
592 | if (old_sc && (old_sc != sc)) { | |
593 | o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); | |
594 | sc_put(old_sc); | |
595 | } | |
596 | } | |
597 | ||
598 | /* see o2net_register_callbacks() */ | |
676d2369 | 599 | static void o2net_data_ready(struct sock *sk) |
98211489 | 600 | { |
676d2369 | 601 | void (*ready)(struct sock *sk); |
e1daca28 | 602 | struct o2net_sock_container *sc; |
98211489 | 603 | |
e1daca28 ED |
604 | read_lock_bh(&sk->sk_callback_lock); |
605 | sc = sk->sk_user_data; | |
606 | if (sc) { | |
98211489 | 607 | sclog(sc, "data_ready hit\n"); |
ff1becbf | 608 | o2net_set_data_ready_time(sc); |
98211489 ZB |
609 | o2net_sc_queue_work(sc, &sc->sc_rx_work); |
610 | ready = sc->sc_data_ready; | |
611 | } else { | |
612 | ready = sk->sk_data_ready; | |
613 | } | |
e1daca28 | 614 | read_unlock_bh(&sk->sk_callback_lock); |
98211489 | 615 | |
676d2369 | 616 | ready(sk); |
98211489 ZB |
617 | } |
618 | ||
619 | /* see o2net_register_callbacks() */ | |
620 | static void o2net_state_change(struct sock *sk) | |
621 | { | |
622 | void (*state_change)(struct sock *sk); | |
623 | struct o2net_sock_container *sc; | |
624 | ||
e1daca28 | 625 | read_lock_bh(&sk->sk_callback_lock); |
98211489 ZB |
626 | sc = sk->sk_user_data; |
627 | if (sc == NULL) { | |
628 | state_change = sk->sk_state_change; | |
629 | goto out; | |
630 | } | |
631 | ||
632 | sclog(sc, "state_change to %d\n", sk->sk_state); | |
633 | ||
634 | state_change = sc->sc_state_change; | |
635 | ||
636 | switch(sk->sk_state) { | |
44e89cb8 JL |
637 | /* ignore connecting sockets as they make progress */ |
638 | case TCP_SYN_SENT: | |
639 | case TCP_SYN_RECV: | |
640 | break; | |
641 | case TCP_ESTABLISHED: | |
642 | o2net_sc_queue_work(sc, &sc->sc_connect_work); | |
643 | break; | |
644 | default: | |
645 | printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT | |
646 | " shutdown, state %d\n", | |
647 | SC_NODEF_ARGS(sc), sk->sk_state); | |
648 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); | |
649 | break; | |
98211489 ZB |
650 | } |
651 | out: | |
e1daca28 | 652 | read_unlock_bh(&sk->sk_callback_lock); |
98211489 ZB |
653 | state_change(sk); |
654 | } | |
655 | ||
656 | /* | |
657 | * we register callbacks so we can queue work on events before calling | |
658 | * the original callbacks. our callbacks our careful to test user_data | |
659 | * to discover when they've reaced with o2net_unregister_callbacks(). | |
660 | */ | |
661 | static void o2net_register_callbacks(struct sock *sk, | |
662 | struct o2net_sock_container *sc) | |
663 | { | |
664 | write_lock_bh(&sk->sk_callback_lock); | |
665 | ||
666 | /* accepted sockets inherit the old listen socket data ready */ | |
667 | if (sk->sk_data_ready == o2net_listen_data_ready) { | |
668 | sk->sk_data_ready = sk->sk_user_data; | |
669 | sk->sk_user_data = NULL; | |
670 | } | |
671 | ||
672 | BUG_ON(sk->sk_user_data != NULL); | |
673 | sk->sk_user_data = sc; | |
674 | sc_get(sc); | |
675 | ||
676 | sc->sc_data_ready = sk->sk_data_ready; | |
677 | sc->sc_state_change = sk->sk_state_change; | |
678 | sk->sk_data_ready = o2net_data_ready; | |
679 | sk->sk_state_change = o2net_state_change; | |
680 | ||
925037bc ZW |
681 | mutex_init(&sc->sc_send_lock); |
682 | ||
98211489 ZB |
683 | write_unlock_bh(&sk->sk_callback_lock); |
684 | } | |
685 | ||
686 | static int o2net_unregister_callbacks(struct sock *sk, | |
687 | struct o2net_sock_container *sc) | |
688 | { | |
689 | int ret = 0; | |
690 | ||
691 | write_lock_bh(&sk->sk_callback_lock); | |
692 | if (sk->sk_user_data == sc) { | |
693 | ret = 1; | |
694 | sk->sk_user_data = NULL; | |
695 | sk->sk_data_ready = sc->sc_data_ready; | |
696 | sk->sk_state_change = sc->sc_state_change; | |
697 | } | |
698 | write_unlock_bh(&sk->sk_callback_lock); | |
699 | ||
700 | return ret; | |
701 | } | |
702 | ||
703 | /* | |
704 | * this is a little helper that is called by callers who have seen a problem | |
705 | * with an sc and want to detach it from the nn if someone already hasn't beat | |
706 | * them to it. if an error is given then the shutdown will be persistent | |
707 | * and pending transmits will be canceled. | |
708 | */ | |
709 | static void o2net_ensure_shutdown(struct o2net_node *nn, | |
710 | struct o2net_sock_container *sc, | |
711 | int err) | |
712 | { | |
713 | spin_lock(&nn->nn_lock); | |
714 | if (nn->nn_sc == sc) | |
715 | o2net_set_nn_state(nn, NULL, 0, err); | |
716 | spin_unlock(&nn->nn_lock); | |
717 | } | |
718 | ||
719 | /* | |
720 | * This work queue function performs the blocking parts of socket shutdown. A | |
721 | * few paths lead here. set_nn_state will trigger this callback if it sees an | |
722 | * sc detached from the nn. state_change will also trigger this callback | |
723 | * directly when it sees errors. In that case we need to call set_nn_state | |
724 | * ourselves as state_change couldn't get the nn_lock and call set_nn_state | |
725 | * itself. | |
726 | */ | |
c4028958 | 727 | static void o2net_shutdown_sc(struct work_struct *work) |
98211489 | 728 | { |
c4028958 DH |
729 | struct o2net_sock_container *sc = |
730 | container_of(work, struct o2net_sock_container, | |
731 | sc_shutdown_work); | |
98211489 ZB |
732 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
733 | ||
734 | sclog(sc, "shutting down\n"); | |
735 | ||
736 | /* drop the callbacks ref and call shutdown only once */ | |
737 | if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { | |
738 | /* we shouldn't flush as we're in the thread, the | |
739 | * races with pending sc work structs are harmless */ | |
740 | del_timer_sync(&sc->sc_idle_timeout); | |
741 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); | |
742 | sc_put(sc); | |
91cf45f0 | 743 | kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); |
98211489 ZB |
744 | } |
745 | ||
746 | /* not fatal so failed connects before the other guy has our | |
747 | * heartbeat can be retried */ | |
748 | o2net_ensure_shutdown(nn, sc, 0); | |
749 | sc_put(sc); | |
750 | } | |
751 | ||
752 | /* ------------------------------------------------------------ */ | |
753 | ||
754 | static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, | |
755 | u32 key) | |
756 | { | |
757 | int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); | |
758 | ||
759 | if (ret == 0) | |
760 | ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); | |
761 | ||
762 | return ret; | |
763 | } | |
764 | ||
765 | static struct o2net_msg_handler * | |
766 | o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, | |
767 | struct rb_node **ret_parent) | |
768 | { | |
9a239e4c JQ |
769 | struct rb_node **p = &o2net_handler_tree.rb_node; |
770 | struct rb_node *parent = NULL; | |
98211489 ZB |
771 | struct o2net_msg_handler *nmh, *ret = NULL; |
772 | int cmp; | |
773 | ||
9a239e4c JQ |
774 | while (*p) { |
775 | parent = *p; | |
776 | nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); | |
98211489 ZB |
777 | cmp = o2net_handler_cmp(nmh, msg_type, key); |
778 | ||
9a239e4c JQ |
779 | if (cmp < 0) |
780 | p = &(*p)->rb_left; | |
781 | else if (cmp > 0) | |
782 | p = &(*p)->rb_right; | |
783 | else { | |
98211489 | 784 | ret = nmh; |
9a239e4c | 785 | break; |
98211489 | 786 | } |
9a239e4c | 787 | } |
98211489 | 788 | |
9a239e4c JQ |
789 | if (ret_p != NULL) |
790 | *ret_p = p; | |
791 | if (ret_parent != NULL) | |
792 | *ret_parent = parent; | |
98211489 | 793 | |
9a239e4c | 794 | return ret; |
98211489 ZB |
795 | } |
796 | ||
797 | static void o2net_handler_kref_release(struct kref *kref) | |
798 | { | |
799 | struct o2net_msg_handler *nmh; | |
800 | nmh = container_of(kref, struct o2net_msg_handler, nh_kref); | |
801 | ||
802 | kfree(nmh); | |
803 | } | |
804 | ||
805 | static void o2net_handler_put(struct o2net_msg_handler *nmh) | |
806 | { | |
807 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); | |
808 | } | |
809 | ||
810 | /* max_len is protection for the handler func. incoming messages won't | |
811 | * be given to the handler if their payload is longer than the max. */ | |
812 | int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, | |
813 | o2net_msg_handler_func *func, void *data, | |
d74c9803 | 814 | o2net_post_msg_handler_func *post_func, |
98211489 ZB |
815 | struct list_head *unreg_list) |
816 | { | |
817 | struct o2net_msg_handler *nmh = NULL; | |
818 | struct rb_node **p, *parent; | |
819 | int ret = 0; | |
820 | ||
821 | if (max_len > O2NET_MAX_PAYLOAD_BYTES) { | |
822 | mlog(0, "max_len for message handler out of range: %u\n", | |
823 | max_len); | |
824 | ret = -EINVAL; | |
825 | goto out; | |
826 | } | |
827 | ||
828 | if (!msg_type) { | |
829 | mlog(0, "no message type provided: %u, %p\n", msg_type, func); | |
830 | ret = -EINVAL; | |
831 | goto out; | |
832 | ||
833 | } | |
834 | if (!func) { | |
835 | mlog(0, "no message handler provided: %u, %p\n", | |
836 | msg_type, func); | |
837 | ret = -EINVAL; | |
838 | goto out; | |
839 | } | |
840 | ||
cd861280 | 841 | nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); |
98211489 ZB |
842 | if (nmh == NULL) { |
843 | ret = -ENOMEM; | |
844 | goto out; | |
845 | } | |
846 | ||
847 | nmh->nh_func = func; | |
848 | nmh->nh_func_data = data; | |
d74c9803 | 849 | nmh->nh_post_func = post_func; |
98211489 ZB |
850 | nmh->nh_msg_type = msg_type; |
851 | nmh->nh_max_len = max_len; | |
852 | nmh->nh_key = key; | |
853 | /* the tree and list get this ref.. they're both removed in | |
854 | * unregister when this ref is dropped */ | |
855 | kref_init(&nmh->nh_kref); | |
856 | INIT_LIST_HEAD(&nmh->nh_unregister_item); | |
857 | ||
858 | write_lock(&o2net_handler_lock); | |
859 | if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) | |
860 | ret = -EEXIST; | |
861 | else { | |
862 | rb_link_node(&nmh->nh_node, parent, p); | |
863 | rb_insert_color(&nmh->nh_node, &o2net_handler_tree); | |
864 | list_add_tail(&nmh->nh_unregister_item, unreg_list); | |
865 | ||
866 | mlog(ML_TCP, "registered handler func %p type %u key %08x\n", | |
867 | func, msg_type, key); | |
868 | /* we've had some trouble with handlers seemingly vanishing. */ | |
869 | mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, | |
870 | &parent) == NULL, | |
8a168ca7 | 871 | "couldn't find handler we *just* registered " |
98211489 ZB |
872 | "for type %u key %08x\n", msg_type, key); |
873 | } | |
874 | write_unlock(&o2net_handler_lock); | |
875 | if (ret) | |
876 | goto out; | |
877 | ||
878 | out: | |
879 | if (ret) | |
880 | kfree(nmh); | |
881 | ||
882 | return ret; | |
883 | } | |
884 | EXPORT_SYMBOL_GPL(o2net_register_handler); | |
885 | ||
886 | void o2net_unregister_handler_list(struct list_head *list) | |
887 | { | |
800deef3 | 888 | struct o2net_msg_handler *nmh, *n; |
98211489 ZB |
889 | |
890 | write_lock(&o2net_handler_lock); | |
800deef3 | 891 | list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { |
98211489 ZB |
892 | mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", |
893 | nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); | |
894 | rb_erase(&nmh->nh_node, &o2net_handler_tree); | |
895 | list_del_init(&nmh->nh_unregister_item); | |
896 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); | |
897 | } | |
898 | write_unlock(&o2net_handler_lock); | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); | |
901 | ||
902 | static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) | |
903 | { | |
904 | struct o2net_msg_handler *nmh; | |
905 | ||
906 | read_lock(&o2net_handler_lock); | |
907 | nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); | |
908 | if (nmh) | |
909 | kref_get(&nmh->nh_kref); | |
910 | read_unlock(&o2net_handler_lock); | |
911 | ||
912 | return nmh; | |
913 | } | |
914 | ||
915 | /* ------------------------------------------------------------ */ | |
916 | ||
917 | static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) | |
918 | { | |
920220c1 AV |
919 | struct kvec vec = { .iov_len = len, .iov_base = data, }; |
920 | struct msghdr msg = { .msg_flags = MSG_DONTWAIT, }; | |
921 | return kernel_recvmsg(sock, &msg, &vec, 1, len, msg.msg_flags); | |
98211489 ZB |
922 | } |
923 | ||
924 | static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, | |
925 | size_t veclen, size_t total) | |
926 | { | |
927 | int ret; | |
7e8631e8 | 928 | struct msghdr msg = {.msg_flags = 0,}; |
98211489 ZB |
929 | |
930 | if (sock == NULL) { | |
931 | ret = -EINVAL; | |
932 | goto out; | |
933 | } | |
934 | ||
66f5dcef AV |
935 | ret = kernel_sendmsg(sock, &msg, vec, veclen, total); |
936 | if (likely(ret == total)) | |
937 | return 0; | |
938 | mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, total); | |
939 | if (ret >= 0) | |
940 | ret = -EPIPE; /* should be smarter, I bet */ | |
98211489 | 941 | out: |
66f5dcef | 942 | mlog(0, "returning error: %d\n", ret); |
98211489 ZB |
943 | return ret; |
944 | } | |
945 | ||
946 | static void o2net_sendpage(struct o2net_sock_container *sc, | |
947 | void *kmalloced_virt, | |
948 | size_t size) | |
949 | { | |
950 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
951 | ssize_t ret; | |
952 | ||
ce17204a SM |
953 | while (1) { |
954 | mutex_lock(&sc->sc_send_lock); | |
955 | ret = sc->sc_sock->ops->sendpage(sc->sc_sock, | |
956 | virt_to_page(kmalloced_virt), | |
d47736fa | 957 | offset_in_page(kmalloced_virt), |
ce17204a SM |
958 | size, MSG_DONTWAIT); |
959 | mutex_unlock(&sc->sc_send_lock); | |
960 | if (ret == size) | |
961 | break; | |
962 | if (ret == (ssize_t)-EAGAIN) { | |
963 | mlog(0, "sendpage of size %zu to " SC_NODEF_FMT | |
964 | " returned EAGAIN\n", size, SC_NODEF_ARGS(sc)); | |
965 | cond_resched(); | |
966 | continue; | |
967 | } | |
2bd63216 | 968 | mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT |
98211489 ZB |
969 | " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); |
970 | o2net_ensure_shutdown(nn, sc, 0); | |
ce17204a | 971 | break; |
98211489 ZB |
972 | } |
973 | } | |
974 | ||
975 | static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) | |
976 | { | |
977 | memset(msg, 0, sizeof(struct o2net_msg)); | |
978 | msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); | |
979 | msg->data_len = cpu_to_be16(data_len); | |
980 | msg->msg_type = cpu_to_be16(msg_type); | |
981 | msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); | |
982 | msg->status = 0; | |
983 | msg->key = cpu_to_be32(key); | |
984 | } | |
985 | ||
986 | static int o2net_tx_can_proceed(struct o2net_node *nn, | |
987 | struct o2net_sock_container **sc_ret, | |
988 | int *error) | |
989 | { | |
990 | int ret = 0; | |
991 | ||
992 | spin_lock(&nn->nn_lock); | |
993 | if (nn->nn_persistent_error) { | |
994 | ret = 1; | |
995 | *sc_ret = NULL; | |
996 | *error = nn->nn_persistent_error; | |
997 | } else if (nn->nn_sc_valid) { | |
998 | kref_get(&nn->nn_sc->sc_kref); | |
999 | ||
1000 | ret = 1; | |
1001 | *sc_ret = nn->nn_sc; | |
1002 | *error = 0; | |
1003 | } | |
1004 | spin_unlock(&nn->nn_lock); | |
1005 | ||
1006 | return ret; | |
1007 | } | |
1008 | ||
3ba169cc SM |
1009 | /* Get a map of all nodes to which this node is currently connected to */ |
1010 | void o2net_fill_node_map(unsigned long *map, unsigned bytes) | |
1011 | { | |
1012 | struct o2net_sock_container *sc; | |
1013 | int node, ret; | |
1014 | ||
1015 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1016 | ||
1017 | memset(map, 0, bytes); | |
1018 | for (node = 0; node < O2NM_MAX_NODES; ++node) { | |
e6d9f86d DC |
1019 | if (!o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret)) |
1020 | continue; | |
3ba169cc SM |
1021 | if (!ret) { |
1022 | set_bit(node, map); | |
1023 | sc_put(sc); | |
1024 | } | |
1025 | } | |
1026 | } | |
1027 | EXPORT_SYMBOL_GPL(o2net_fill_node_map); | |
1028 | ||
98211489 ZB |
1029 | int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, |
1030 | size_t caller_veclen, u8 target_node, int *status) | |
1031 | { | |
50aff040 | 1032 | int ret = 0; |
98211489 ZB |
1033 | struct o2net_msg *msg = NULL; |
1034 | size_t veclen, caller_bytes = 0; | |
1035 | struct kvec *vec = NULL; | |
1036 | struct o2net_sock_container *sc = NULL; | |
1037 | struct o2net_node *nn = o2net_nn_from_num(target_node); | |
1038 | struct o2net_status_wait nsw = { | |
1039 | .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), | |
1040 | }; | |
2309e9e0 SM |
1041 | struct o2net_send_tracking nst; |
1042 | ||
1043 | o2net_init_nst(&nst, msg_type, key, current, target_node); | |
98211489 ZB |
1044 | |
1045 | if (o2net_wq == NULL) { | |
1046 | mlog(0, "attempt to tx without o2netd running\n"); | |
1047 | ret = -ESRCH; | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1051 | if (caller_veclen == 0) { | |
1052 | mlog(0, "bad kvec array length\n"); | |
1053 | ret = -EINVAL; | |
1054 | goto out; | |
1055 | } | |
1056 | ||
1057 | caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); | |
1058 | if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { | |
1059 | mlog(0, "total payload len %zu too large\n", caller_bytes); | |
1060 | ret = -EINVAL; | |
1061 | goto out; | |
1062 | } | |
1063 | ||
1064 | if (target_node == o2nm_this_node()) { | |
1065 | ret = -ELOOP; | |
1066 | goto out; | |
1067 | } | |
1068 | ||
2309e9e0 SM |
1069 | o2net_debug_add_nst(&nst); |
1070 | ||
1071 | o2net_set_nst_sock_time(&nst); | |
1072 | ||
9af0b38f | 1073 | wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); |
98211489 ZB |
1074 | if (ret) |
1075 | goto out; | |
1076 | ||
2309e9e0 SM |
1077 | o2net_set_nst_sock_container(&nst, sc); |
1078 | ||
98211489 ZB |
1079 | veclen = caller_veclen + 1; |
1080 | vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); | |
1081 | if (vec == NULL) { | |
1082 | mlog(0, "failed to %zu element kvec!\n", veclen); | |
1083 | ret = -ENOMEM; | |
1084 | goto out; | |
1085 | } | |
1086 | ||
1087 | msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); | |
1088 | if (!msg) { | |
1089 | mlog(0, "failed to allocate a o2net_msg!\n"); | |
1090 | ret = -ENOMEM; | |
1091 | goto out; | |
1092 | } | |
1093 | ||
1094 | o2net_init_msg(msg, caller_bytes, msg_type, key); | |
1095 | ||
1096 | vec[0].iov_len = sizeof(struct o2net_msg); | |
1097 | vec[0].iov_base = msg; | |
1098 | memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); | |
1099 | ||
1100 | ret = o2net_prep_nsw(nn, &nsw); | |
1101 | if (ret) | |
1102 | goto out; | |
1103 | ||
1104 | msg->msg_num = cpu_to_be32(nsw.ns_id); | |
2309e9e0 SM |
1105 | o2net_set_nst_msg_id(&nst, nsw.ns_id); |
1106 | ||
1107 | o2net_set_nst_send_time(&nst); | |
98211489 ZB |
1108 | |
1109 | /* finally, convert the message header to network byte-order | |
1110 | * and send */ | |
925037bc | 1111 | mutex_lock(&sc->sc_send_lock); |
98211489 ZB |
1112 | ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, |
1113 | sizeof(struct o2net_msg) + caller_bytes); | |
925037bc | 1114 | mutex_unlock(&sc->sc_send_lock); |
98211489 ZB |
1115 | msglog(msg, "sending returned %d\n", ret); |
1116 | if (ret < 0) { | |
1117 | mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); | |
1118 | goto out; | |
1119 | } | |
1120 | ||
1121 | /* wait on other node's handler */ | |
2309e9e0 | 1122 | o2net_set_nst_status_time(&nst); |
98211489 ZB |
1123 | wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); |
1124 | ||
3c193b38 SM |
1125 | o2net_update_send_stats(&nst, sc); |
1126 | ||
98211489 ZB |
1127 | /* Note that we avoid overwriting the callers status return |
1128 | * variable if a system error was reported on the other | |
1129 | * side. Callers beware. */ | |
1130 | ret = o2net_sys_err_to_errno(nsw.ns_sys_status); | |
1131 | if (status && !ret) | |
1132 | *status = nsw.ns_status; | |
1133 | ||
1134 | mlog(0, "woken, returning system status %d, user status %d\n", | |
1135 | ret, nsw.ns_status); | |
1136 | out: | |
2309e9e0 | 1137 | o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ |
98211489 ZB |
1138 | if (sc) |
1139 | sc_put(sc); | |
d787ab09 TG |
1140 | kfree(vec); |
1141 | kfree(msg); | |
98211489 ZB |
1142 | o2net_complete_nsw(nn, &nsw, 0, 0, 0); |
1143 | return ret; | |
1144 | } | |
1145 | EXPORT_SYMBOL_GPL(o2net_send_message_vec); | |
1146 | ||
1147 | int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, | |
1148 | u8 target_node, int *status) | |
1149 | { | |
1150 | struct kvec vec = { | |
1151 | .iov_base = data, | |
1152 | .iov_len = len, | |
1153 | }; | |
1154 | return o2net_send_message_vec(msg_type, key, &vec, 1, | |
1155 | target_node, status); | |
1156 | } | |
1157 | EXPORT_SYMBOL_GPL(o2net_send_message); | |
1158 | ||
1159 | static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, | |
1160 | enum o2net_system_error syserr, int err) | |
1161 | { | |
1162 | struct kvec vec = { | |
1163 | .iov_base = hdr, | |
1164 | .iov_len = sizeof(struct o2net_msg), | |
1165 | }; | |
1166 | ||
1167 | BUG_ON(syserr >= O2NET_ERR_MAX); | |
1168 | ||
1169 | /* leave other fields intact from the incoming message, msg_num | |
1170 | * in particular */ | |
1171 | hdr->sys_status = cpu_to_be32(syserr); | |
1172 | hdr->status = cpu_to_be32(err); | |
1173 | hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic | |
1174 | hdr->data_len = 0; | |
1175 | ||
1176 | msglog(hdr, "about to send status magic %d\n", err); | |
1177 | /* hdr has been in host byteorder this whole time */ | |
1178 | return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); | |
1179 | } | |
1180 | ||
1181 | /* this returns -errno if the header was unknown or too large, etc. | |
1182 | * after this is called the buffer us reused for the next message */ | |
1183 | static int o2net_process_message(struct o2net_sock_container *sc, | |
1184 | struct o2net_msg *hdr) | |
1185 | { | |
1186 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
1187 | int ret = 0, handler_status; | |
1188 | enum o2net_system_error syserr; | |
1189 | struct o2net_msg_handler *nmh = NULL; | |
d74c9803 | 1190 | void *ret_data = NULL; |
98211489 ZB |
1191 | |
1192 | msglog(hdr, "processing message\n"); | |
1193 | ||
1194 | o2net_sc_postpone_idle(sc); | |
1195 | ||
1196 | switch(be16_to_cpu(hdr->magic)) { | |
1197 | case O2NET_MSG_STATUS_MAGIC: | |
1198 | /* special type for returning message status */ | |
1199 | o2net_complete_nsw(nn, NULL, | |
1200 | be32_to_cpu(hdr->msg_num), | |
1201 | be32_to_cpu(hdr->sys_status), | |
1202 | be32_to_cpu(hdr->status)); | |
1203 | goto out; | |
1204 | case O2NET_MSG_KEEP_REQ_MAGIC: | |
1205 | o2net_sendpage(sc, o2net_keep_resp, | |
1206 | sizeof(*o2net_keep_resp)); | |
1207 | goto out; | |
1208 | case O2NET_MSG_KEEP_RESP_MAGIC: | |
1209 | goto out; | |
1210 | case O2NET_MSG_MAGIC: | |
1211 | break; | |
1212 | default: | |
1213 | msglog(hdr, "bad magic\n"); | |
1214 | ret = -EINVAL; | |
1215 | goto out; | |
1216 | break; | |
1217 | } | |
1218 | ||
1219 | /* find a handler for it */ | |
1220 | handler_status = 0; | |
1221 | nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), | |
1222 | be32_to_cpu(hdr->key)); | |
1223 | if (!nmh) { | |
1224 | mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", | |
1225 | be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); | |
1226 | syserr = O2NET_ERR_NO_HNDLR; | |
1227 | goto out_respond; | |
1228 | } | |
1229 | ||
1230 | syserr = O2NET_ERR_NONE; | |
1231 | ||
1232 | if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) | |
1233 | syserr = O2NET_ERR_OVERFLOW; | |
1234 | ||
1235 | if (syserr != O2NET_ERR_NONE) | |
1236 | goto out_respond; | |
1237 | ||
ff1becbf | 1238 | o2net_set_func_start_time(sc); |
98211489 ZB |
1239 | sc->sc_msg_key = be32_to_cpu(hdr->key); |
1240 | sc->sc_msg_type = be16_to_cpu(hdr->msg_type); | |
1241 | handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + | |
1242 | be16_to_cpu(hdr->data_len), | |
d74c9803 | 1243 | nmh->nh_func_data, &ret_data); |
ff1becbf | 1244 | o2net_set_func_stop_time(sc); |
98211489 | 1245 | |
e453039f SM |
1246 | o2net_update_recv_stats(sc); |
1247 | ||
98211489 ZB |
1248 | out_respond: |
1249 | /* this destroys the hdr, so don't use it after this */ | |
925037bc | 1250 | mutex_lock(&sc->sc_send_lock); |
98211489 ZB |
1251 | ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, |
1252 | handler_status); | |
925037bc | 1253 | mutex_unlock(&sc->sc_send_lock); |
98211489 ZB |
1254 | hdr = NULL; |
1255 | mlog(0, "sending handler status %d, syserr %d returned %d\n", | |
1256 | handler_status, syserr, ret); | |
1257 | ||
d74c9803 KH |
1258 | if (nmh) { |
1259 | BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); | |
1260 | if (nmh->nh_post_func) | |
1261 | (nmh->nh_post_func)(handler_status, nmh->nh_func_data, | |
1262 | ret_data); | |
1263 | } | |
1264 | ||
98211489 ZB |
1265 | out: |
1266 | if (nmh) | |
1267 | o2net_handler_put(nmh); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | static int o2net_check_handshake(struct o2net_sock_container *sc) | |
1272 | { | |
1273 | struct o2net_handshake *hand = page_address(sc->sc_page); | |
1274 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
1275 | ||
1276 | if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { | |
1dfecf81 SM |
1277 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net " |
1278 | "protocol version %llu but %llu is required. " | |
1279 | "Disconnecting.\n", SC_NODEF_ARGS(sc), | |
1280 | (unsigned long long)be64_to_cpu(hand->protocol_version), | |
1281 | O2NET_PROTOCOL_VERSION); | |
98211489 ZB |
1282 | |
1283 | /* don't bother reconnecting if its the wrong version. */ | |
1284 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); | |
1285 | return -1; | |
1286 | } | |
1287 | ||
828ae6af AB |
1288 | /* |
1289 | * Ensure timeouts are consistent with other nodes, otherwise | |
1290 | * we can end up with one node thinking that the other must be down, | |
1291 | * but isn't. This can ultimately cause corruption. | |
1292 | */ | |
1293 | if (be32_to_cpu(hand->o2net_idle_timeout_ms) != | |
409753bf | 1294 | o2net_idle_timeout()) { |
1dfecf81 SM |
1295 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network " |
1296 | "idle timeout of %u ms, but we use %u ms locally. " | |
1297 | "Disconnecting.\n", SC_NODEF_ARGS(sc), | |
1298 | be32_to_cpu(hand->o2net_idle_timeout_ms), | |
1299 | o2net_idle_timeout()); | |
828ae6af AB |
1300 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1301 | return -1; | |
1302 | } | |
1303 | ||
1304 | if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != | |
409753bf | 1305 | o2net_keepalive_delay()) { |
1dfecf81 SM |
1306 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive " |
1307 | "delay of %u ms, but we use %u ms locally. " | |
1308 | "Disconnecting.\n", SC_NODEF_ARGS(sc), | |
1309 | be32_to_cpu(hand->o2net_keepalive_delay_ms), | |
1310 | o2net_keepalive_delay()); | |
828ae6af AB |
1311 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1312 | return -1; | |
1313 | } | |
1314 | ||
1315 | if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != | |
1316 | O2HB_MAX_WRITE_TIMEOUT_MS) { | |
1dfecf81 SM |
1317 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat " |
1318 | "timeout of %u ms, but we use %u ms locally. " | |
1319 | "Disconnecting.\n", SC_NODEF_ARGS(sc), | |
1320 | be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), | |
1321 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
828ae6af AB |
1322 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
1323 | return -1; | |
1324 | } | |
1325 | ||
98211489 ZB |
1326 | sc->sc_handshake_ok = 1; |
1327 | ||
1328 | spin_lock(&nn->nn_lock); | |
1329 | /* set valid and queue the idle timers only if it hasn't been | |
1330 | * shut down already */ | |
1331 | if (nn->nn_sc == sc) { | |
b5dd8030 | 1332 | o2net_sc_reset_idle_timer(sc); |
5cc3bf27 | 1333 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1334 | o2net_set_nn_state(nn, sc, 1, 0); |
1335 | } | |
1336 | spin_unlock(&nn->nn_lock); | |
1337 | ||
1338 | /* shift everything up as though it wasn't there */ | |
1339 | sc->sc_page_off -= sizeof(struct o2net_handshake); | |
1340 | if (sc->sc_page_off) | |
1341 | memmove(hand, hand + 1, sc->sc_page_off); | |
1342 | ||
1343 | return 0; | |
1344 | } | |
1345 | ||
1346 | /* this demuxes the queued rx bytes into header or payload bits and calls | |
1347 | * handlers as each full message is read off the socket. it returns -error, | |
1348 | * == 0 eof, or > 0 for progress made.*/ | |
1349 | static int o2net_advance_rx(struct o2net_sock_container *sc) | |
1350 | { | |
1351 | struct o2net_msg *hdr; | |
1352 | int ret = 0; | |
1353 | void *data; | |
1354 | size_t datalen; | |
1355 | ||
1356 | sclog(sc, "receiving\n"); | |
ff1becbf | 1357 | o2net_set_advance_start_time(sc); |
98211489 | 1358 | |
828ae6af AB |
1359 | if (unlikely(sc->sc_handshake_ok == 0)) { |
1360 | if(sc->sc_page_off < sizeof(struct o2net_handshake)) { | |
1361 | data = page_address(sc->sc_page) + sc->sc_page_off; | |
1362 | datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; | |
1363 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); | |
1364 | if (ret > 0) | |
1365 | sc->sc_page_off += ret; | |
1366 | } | |
1367 | ||
1368 | if (sc->sc_page_off == sizeof(struct o2net_handshake)) { | |
1369 | o2net_check_handshake(sc); | |
1370 | if (unlikely(sc->sc_handshake_ok == 0)) | |
1371 | ret = -EPROTO; | |
1372 | } | |
1373 | goto out; | |
1374 | } | |
1375 | ||
98211489 ZB |
1376 | /* do we need more header? */ |
1377 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { | |
1378 | data = page_address(sc->sc_page) + sc->sc_page_off; | |
1379 | datalen = sizeof(struct o2net_msg) - sc->sc_page_off; | |
1380 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); | |
1381 | if (ret > 0) { | |
1382 | sc->sc_page_off += ret; | |
98211489 ZB |
1383 | /* only swab incoming here.. we can |
1384 | * only get here once as we cross from | |
1385 | * being under to over */ | |
1386 | if (sc->sc_page_off == sizeof(struct o2net_msg)) { | |
1387 | hdr = page_address(sc->sc_page); | |
1388 | if (be16_to_cpu(hdr->data_len) > | |
1389 | O2NET_MAX_PAYLOAD_BYTES) | |
1390 | ret = -EOVERFLOW; | |
1391 | } | |
1392 | } | |
1393 | if (ret <= 0) | |
1394 | goto out; | |
1395 | } | |
1396 | ||
1397 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { | |
1398 | /* oof, still don't have a header */ | |
1399 | goto out; | |
1400 | } | |
1401 | ||
1402 | /* this was swabbed above when we first read it */ | |
1403 | hdr = page_address(sc->sc_page); | |
1404 | ||
1405 | msglog(hdr, "at page_off %zu\n", sc->sc_page_off); | |
1406 | ||
1407 | /* do we need more payload? */ | |
1408 | if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { | |
1409 | /* need more payload */ | |
1410 | data = page_address(sc->sc_page) + sc->sc_page_off; | |
1411 | datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - | |
1412 | sc->sc_page_off; | |
1413 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); | |
1414 | if (ret > 0) | |
1415 | sc->sc_page_off += ret; | |
1416 | if (ret <= 0) | |
1417 | goto out; | |
1418 | } | |
1419 | ||
1420 | if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { | |
1421 | /* we can only get here once, the first time we read | |
1422 | * the payload.. so set ret to progress if the handler | |
1423 | * works out. after calling this the message is toast */ | |
1424 | ret = o2net_process_message(sc, hdr); | |
1425 | if (ret == 0) | |
1426 | ret = 1; | |
1427 | sc->sc_page_off = 0; | |
1428 | } | |
1429 | ||
1430 | out: | |
1431 | sclog(sc, "ret = %d\n", ret); | |
ff1becbf | 1432 | o2net_set_advance_stop_time(sc); |
98211489 ZB |
1433 | return ret; |
1434 | } | |
1435 | ||
1436 | /* this work func is triggerd by data ready. it reads until it can read no | |
1437 | * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing | |
1438 | * our work the work struct will be marked and we'll be called again. */ | |
c4028958 | 1439 | static void o2net_rx_until_empty(struct work_struct *work) |
98211489 | 1440 | { |
c4028958 DH |
1441 | struct o2net_sock_container *sc = |
1442 | container_of(work, struct o2net_sock_container, sc_rx_work); | |
98211489 ZB |
1443 | int ret; |
1444 | ||
1445 | do { | |
1446 | ret = o2net_advance_rx(sc); | |
1447 | } while (ret > 0); | |
1448 | ||
1449 | if (ret <= 0 && ret != -EAGAIN) { | |
1450 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); | |
1451 | sclog(sc, "saw error %d, closing\n", ret); | |
1452 | /* not permanent so read failed handshake can retry */ | |
1453 | o2net_ensure_shutdown(nn, sc, 0); | |
1454 | } | |
1455 | ||
1456 | sc_put(sc); | |
1457 | } | |
1458 | ||
1459 | static int o2net_set_nodelay(struct socket *sock) | |
1460 | { | |
e73a67f7 | 1461 | int val = 1; |
98211489 | 1462 | |
e73a67f7 AV |
1463 | return kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, |
1464 | (void *)&val, sizeof(val)); | |
98211489 ZB |
1465 | } |
1466 | ||
8e9801df JB |
1467 | static int o2net_set_usertimeout(struct socket *sock) |
1468 | { | |
1469 | int user_timeout = O2NET_TCP_USER_TIMEOUT; | |
1470 | ||
1471 | return kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, | |
e73a67f7 | 1472 | (void *)&user_timeout, sizeof(user_timeout)); |
8e9801df JB |
1473 | } |
1474 | ||
828ae6af AB |
1475 | static void o2net_initialize_handshake(void) |
1476 | { | |
1477 | o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( | |
1478 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
409753bf | 1479 | o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); |
828ae6af | 1480 | o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( |
409753bf | 1481 | o2net_keepalive_delay()); |
828ae6af | 1482 | o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( |
409753bf | 1483 | o2net_reconnect_delay()); |
828ae6af AB |
1484 | } |
1485 | ||
98211489 ZB |
1486 | /* ------------------------------------------------------------ */ |
1487 | ||
1488 | /* called when a connect completes and after a sock is accepted. the | |
1489 | * rx path will see the response and mark the sc valid */ | |
c4028958 | 1490 | static void o2net_sc_connect_completed(struct work_struct *work) |
98211489 | 1491 | { |
c4028958 DH |
1492 | struct o2net_sock_container *sc = |
1493 | container_of(work, struct o2net_sock_container, | |
1494 | sc_connect_work); | |
98211489 ZB |
1495 | |
1496 | mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", | |
1497 | (unsigned long long)O2NET_PROTOCOL_VERSION, | |
1498 | (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); | |
1499 | ||
828ae6af | 1500 | o2net_initialize_handshake(); |
98211489 ZB |
1501 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1502 | sc_put(sc); | |
1503 | } | |
1504 | ||
1505 | /* this is called as a work_struct func. */ | |
c4028958 | 1506 | static void o2net_sc_send_keep_req(struct work_struct *work) |
98211489 | 1507 | { |
c4028958 DH |
1508 | struct o2net_sock_container *sc = |
1509 | container_of(work, struct o2net_sock_container, | |
1510 | sc_keepalive_work.work); | |
98211489 ZB |
1511 | |
1512 | o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); | |
1513 | sc_put(sc); | |
1514 | } | |
1515 | ||
1516 | /* socket shutdown does a del_timer_sync against this as it tears down. | |
1517 | * we can't start this timer until we've got to the point in sc buildup | |
1518 | * where shutdown is going to be involved */ | |
e99e88a9 | 1519 | static void o2net_idle_timer(struct timer_list *t) |
98211489 | 1520 | { |
e99e88a9 | 1521 | struct o2net_sock_container *sc = from_timer(sc, t, sc_idle_timeout); |
5cc3bf27 | 1522 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
ff1becbf | 1523 | #ifdef CONFIG_DEBUG_FS |
1dfecf81 SM |
1524 | unsigned long msecs = ktime_to_ms(ktime_get()) - |
1525 | ktime_to_ms(sc->sc_tv_timer); | |
1526 | #else | |
1527 | unsigned long msecs = o2net_idle_timeout(); | |
ff1becbf | 1528 | #endif |
98211489 | 1529 | |
1dfecf81 | 1530 | printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been " |
c43c363d JB |
1531 | "idle for %lu.%lu secs.\n", |
1532 | SC_NODEF_ARGS(sc), msecs / 1000, msecs % 1000); | |
98211489 | 1533 | |
c43c363d JB |
1534 | /* idle timerout happen, don't shutdown the connection, but |
1535 | * make fence decision. Maybe the connection can recover before | |
1536 | * the decision is made. | |
5cc3bf27 TM |
1537 | */ |
1538 | atomic_set(&nn->nn_timeout, 1); | |
c43c363d JB |
1539 | o2quo_conn_err(o2net_num_from_nn(nn)); |
1540 | queue_delayed_work(o2net_wq, &nn->nn_still_up, | |
1541 | msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); | |
1542 | ||
1543 | o2net_sc_reset_idle_timer(sc); | |
5cc3bf27 | 1544 | |
98211489 ZB |
1545 | } |
1546 | ||
b5dd8030 | 1547 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) |
98211489 ZB |
1548 | { |
1549 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); | |
1550 | o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, | |
409753bf | 1551 | msecs_to_jiffies(o2net_keepalive_delay())); |
ff1becbf | 1552 | o2net_set_sock_timer(sc); |
98211489 | 1553 | mod_timer(&sc->sc_idle_timeout, |
409753bf | 1554 | jiffies + msecs_to_jiffies(o2net_idle_timeout())); |
b5dd8030 JM |
1555 | } |
1556 | ||
1557 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) | |
1558 | { | |
c43c363d JB |
1559 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
1560 | ||
1561 | /* clear fence decision since the connection recover from timeout*/ | |
1562 | if (atomic_read(&nn->nn_timeout)) { | |
1563 | o2quo_conn_up(o2net_num_from_nn(nn)); | |
1564 | cancel_delayed_work(&nn->nn_still_up); | |
1565 | atomic_set(&nn->nn_timeout, 0); | |
1566 | } | |
1567 | ||
b5dd8030 JM |
1568 | /* Only push out an existing timer */ |
1569 | if (timer_pending(&sc->sc_idle_timeout)) | |
1570 | o2net_sc_reset_idle_timer(sc); | |
98211489 ZB |
1571 | } |
1572 | ||
1573 | /* this work func is kicked whenever a path sets the nn state which doesn't | |
1574 | * have valid set. This includes seeing hb come up, losing a connection, | |
1575 | * having a connect attempt fail, etc. This centralizes the logic which decides | |
1576 | * if a connect attempt should be made or if we should give up and all future | |
1577 | * transmit attempts should fail */ | |
c4028958 | 1578 | static void o2net_start_connect(struct work_struct *work) |
98211489 | 1579 | { |
c4028958 DH |
1580 | struct o2net_node *nn = |
1581 | container_of(work, struct o2net_node, nn_connect_work.work); | |
98211489 | 1582 | struct o2net_sock_container *sc = NULL; |
b7668c72 | 1583 | struct o2nm_node *node = NULL, *mynode = NULL; |
98211489 ZB |
1584 | struct socket *sock = NULL; |
1585 | struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; | |
c4028958 | 1586 | int ret = 0, stop; |
5cc3bf27 | 1587 | unsigned int timeout; |
b246d3d1 | 1588 | unsigned int noio_flag; |
98211489 | 1589 | |
b246d3d1 X |
1590 | /* |
1591 | * sock_create allocates the sock with GFP_KERNEL. We must set | |
1592 | * per-process flag PF_MEMALLOC_NOIO so that all allocations done | |
1593 | * by this process are done as if GFP_NOIO was specified. So we | |
1594 | * are not reentering filesystem while doing memory reclaim. | |
1595 | */ | |
1596 | noio_flag = memalloc_noio_save(); | |
98211489 ZB |
1597 | /* if we're greater we initiate tx, otherwise we accept */ |
1598 | if (o2nm_this_node() <= o2net_num_from_nn(nn)) | |
1599 | goto out; | |
1600 | ||
1601 | /* watch for racing with tearing a node down */ | |
1602 | node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); | |
7d65b274 | 1603 | if (node == NULL) |
98211489 | 1604 | goto out; |
98211489 | 1605 | |
b7668c72 | 1606 | mynode = o2nm_get_node_by_num(o2nm_this_node()); |
7d65b274 | 1607 | if (mynode == NULL) |
b7668c72 | 1608 | goto out; |
b7668c72 | 1609 | |
98211489 | 1610 | spin_lock(&nn->nn_lock); |
5cc3bf27 TM |
1611 | /* |
1612 | * see if we already have one pending or have given up. | |
1613 | * For nn_timeout, it is set when we close the connection | |
1614 | * because of the idle time out. So it means that we have | |
1615 | * at least connected to that node successfully once, | |
1616 | * now try to connect to it again. | |
1617 | */ | |
1618 | timeout = atomic_read(&nn->nn_timeout); | |
1619 | stop = (nn->nn_sc || | |
1620 | (nn->nn_persistent_error && | |
1621 | (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); | |
98211489 | 1622 | spin_unlock(&nn->nn_lock); |
c4028958 | 1623 | if (stop) |
98211489 ZB |
1624 | goto out; |
1625 | ||
1626 | nn->nn_last_connect_attempt = jiffies; | |
1627 | ||
1628 | sc = sc_alloc(node); | |
1629 | if (sc == NULL) { | |
1630 | mlog(0, "couldn't allocate sc\n"); | |
1631 | ret = -ENOMEM; | |
1632 | goto out; | |
1633 | } | |
1634 | ||
1635 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
1636 | if (ret < 0) { | |
1637 | mlog(0, "can't create socket: %d\n", ret); | |
1638 | goto out; | |
1639 | } | |
1640 | sc->sc_sock = sock; /* freed by sc_kref_release */ | |
1641 | ||
1642 | sock->sk->sk_allocation = GFP_ATOMIC; | |
1643 | ||
1644 | myaddr.sin_family = AF_INET; | |
5fdf1e67 | 1645 | myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; |
97bd7919 | 1646 | myaddr.sin_port = htons(0); /* any port */ |
98211489 ZB |
1647 | |
1648 | ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, | |
1649 | sizeof(myaddr)); | |
1650 | if (ret) { | |
be859405 HH |
1651 | mlog(ML_ERROR, "bind failed with %d at address %pI4\n", |
1652 | ret, &mynode->nd_ipv4_address); | |
98211489 ZB |
1653 | goto out; |
1654 | } | |
1655 | ||
1656 | ret = o2net_set_nodelay(sc->sc_sock); | |
1657 | if (ret) { | |
1658 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); | |
1659 | goto out; | |
1660 | } | |
1661 | ||
8e9801df JB |
1662 | ret = o2net_set_usertimeout(sock); |
1663 | if (ret) { | |
1664 | mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret); | |
1665 | goto out; | |
1666 | } | |
1667 | ||
98211489 ZB |
1668 | o2net_register_callbacks(sc->sc_sock->sk, sc); |
1669 | ||
1670 | spin_lock(&nn->nn_lock); | |
1671 | /* handshake completion will set nn->nn_sc_valid */ | |
1672 | o2net_set_nn_state(nn, sc, 0, 0); | |
1673 | spin_unlock(&nn->nn_lock); | |
1674 | ||
1675 | remoteaddr.sin_family = AF_INET; | |
5fdf1e67 MF |
1676 | remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; |
1677 | remoteaddr.sin_port = node->nd_ipv4_port; | |
98211489 ZB |
1678 | |
1679 | ret = sc->sc_sock->ops->connect(sc->sc_sock, | |
1680 | (struct sockaddr *)&remoteaddr, | |
1681 | sizeof(remoteaddr), | |
1682 | O_NONBLOCK); | |
1683 | if (ret == -EINPROGRESS) | |
1684 | ret = 0; | |
1685 | ||
1686 | out: | |
8dd7903e | 1687 | if (ret && sc) { |
1dfecf81 SM |
1688 | printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT |
1689 | " failed with errno %d\n", SC_NODEF_ARGS(sc), ret); | |
98211489 ZB |
1690 | /* 0 err so that another will be queued and attempted |
1691 | * from set_nn_state */ | |
8dd7903e | 1692 | o2net_ensure_shutdown(nn, sc, 0); |
98211489 ZB |
1693 | } |
1694 | if (sc) | |
1695 | sc_put(sc); | |
1696 | if (node) | |
1697 | o2nm_node_put(node); | |
b7668c72 SM |
1698 | if (mynode) |
1699 | o2nm_node_put(mynode); | |
98211489 | 1700 | |
b246d3d1 | 1701 | memalloc_noio_restore(noio_flag); |
98211489 ZB |
1702 | return; |
1703 | } | |
1704 | ||
c4028958 | 1705 | static void o2net_connect_expired(struct work_struct *work) |
98211489 | 1706 | { |
c4028958 DH |
1707 | struct o2net_node *nn = |
1708 | container_of(work, struct o2net_node, nn_connect_expired.work); | |
98211489 ZB |
1709 | |
1710 | spin_lock(&nn->nn_lock); | |
1711 | if (!nn->nn_sc_valid) { | |
1dfecf81 | 1712 | printk(KERN_NOTICE "o2net: No connection established with " |
5046f18d JB |
1713 | "node %u after %u.%u seconds, check network and" |
1714 | " cluster configuration.\n", | |
b5dd8030 | 1715 | o2net_num_from_nn(nn), |
409753bf JM |
1716 | o2net_idle_timeout() / 1000, |
1717 | o2net_idle_timeout() % 1000); | |
98211489 | 1718 | |
196fe71d | 1719 | o2net_set_nn_state(nn, NULL, 0, 0); |
98211489 ZB |
1720 | } |
1721 | spin_unlock(&nn->nn_lock); | |
1722 | } | |
1723 | ||
c4028958 | 1724 | static void o2net_still_up(struct work_struct *work) |
98211489 | 1725 | { |
c4028958 DH |
1726 | struct o2net_node *nn = |
1727 | container_of(work, struct o2net_node, nn_still_up.work); | |
98211489 ZB |
1728 | |
1729 | o2quo_hb_still_up(o2net_num_from_nn(nn)); | |
1730 | } | |
1731 | ||
1732 | /* ------------------------------------------------------------ */ | |
1733 | ||
1734 | void o2net_disconnect_node(struct o2nm_node *node) | |
1735 | { | |
1736 | struct o2net_node *nn = o2net_nn_from_num(node->nd_num); | |
1737 | ||
1738 | /* don't reconnect until it's heartbeating again */ | |
1739 | spin_lock(&nn->nn_lock); | |
5cc3bf27 | 1740 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1741 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
1742 | spin_unlock(&nn->nn_lock); | |
1743 | ||
1744 | if (o2net_wq) { | |
1745 | cancel_delayed_work(&nn->nn_connect_expired); | |
1746 | cancel_delayed_work(&nn->nn_connect_work); | |
1747 | cancel_delayed_work(&nn->nn_still_up); | |
1748 | flush_workqueue(o2net_wq); | |
1749 | } | |
1750 | } | |
1751 | ||
1752 | static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, | |
1753 | void *data) | |
1754 | { | |
1755 | o2quo_hb_down(node_num); | |
1756 | ||
0e105d37 SM |
1757 | if (!node) |
1758 | return; | |
1759 | ||
98211489 ZB |
1760 | if (node_num != o2nm_this_node()) |
1761 | o2net_disconnect_node(node); | |
828ae6af AB |
1762 | |
1763 | BUG_ON(atomic_read(&o2net_connected_peers) < 0); | |
98211489 ZB |
1764 | } |
1765 | ||
1766 | static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, | |
1767 | void *data) | |
1768 | { | |
1769 | struct o2net_node *nn = o2net_nn_from_num(node_num); | |
1770 | ||
1771 | o2quo_hb_up(node_num); | |
1772 | ||
0e105d37 SM |
1773 | BUG_ON(!node); |
1774 | ||
98211489 ZB |
1775 | /* ensure an immediate connect attempt */ |
1776 | nn->nn_last_connect_attempt = jiffies - | |
409753bf | 1777 | (msecs_to_jiffies(o2net_reconnect_delay()) + 1); |
98211489 ZB |
1778 | |
1779 | if (node_num != o2nm_this_node()) { | |
98211489 ZB |
1780 | /* believe it or not, accept and node hearbeating testing |
1781 | * can succeed for this node before we got here.. so | |
1782 | * only use set_nn_state to clear the persistent error | |
1783 | * if that hasn't already happened */ | |
1784 | spin_lock(&nn->nn_lock); | |
5cc3bf27 | 1785 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1786 | if (nn->nn_persistent_error) |
1787 | o2net_set_nn_state(nn, NULL, 0, 0); | |
1788 | spin_unlock(&nn->nn_lock); | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | void o2net_unregister_hb_callbacks(void) | |
1793 | { | |
14829422 JB |
1794 | o2hb_unregister_callback(NULL, &o2net_hb_up); |
1795 | o2hb_unregister_callback(NULL, &o2net_hb_down); | |
98211489 ZB |
1796 | } |
1797 | ||
1798 | int o2net_register_hb_callbacks(void) | |
1799 | { | |
1800 | int ret; | |
1801 | ||
1802 | o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, | |
1803 | o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); | |
1804 | o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, | |
1805 | o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); | |
1806 | ||
14829422 | 1807 | ret = o2hb_register_callback(NULL, &o2net_hb_up); |
98211489 | 1808 | if (ret == 0) |
14829422 | 1809 | ret = o2hb_register_callback(NULL, &o2net_hb_down); |
98211489 ZB |
1810 | |
1811 | if (ret) | |
1812 | o2net_unregister_hb_callbacks(); | |
1813 | ||
1814 | return ret; | |
1815 | } | |
1816 | ||
1817 | /* ------------------------------------------------------------ */ | |
1818 | ||
79deb3c1 | 1819 | static int o2net_accept_one(struct socket *sock, int *more) |
98211489 ZB |
1820 | { |
1821 | int ret, slen; | |
1822 | struct sockaddr_in sin; | |
1823 | struct socket *new_sock = NULL; | |
1824 | struct o2nm_node *node = NULL; | |
415cf32c | 1825 | struct o2nm_node *local_node = NULL; |
98211489 ZB |
1826 | struct o2net_sock_container *sc = NULL; |
1827 | struct o2net_node *nn; | |
b246d3d1 X |
1828 | unsigned int noio_flag; |
1829 | ||
1830 | /* | |
1831 | * sock_create_lite allocates the sock with GFP_KERNEL. We must set | |
1832 | * per-process flag PF_MEMALLOC_NOIO so that all allocations done | |
1833 | * by this process are done as if GFP_NOIO was specified. So we | |
1834 | * are not reentering filesystem while doing memory reclaim. | |
1835 | */ | |
1836 | noio_flag = memalloc_noio_save(); | |
98211489 ZB |
1837 | |
1838 | BUG_ON(sock == NULL); | |
79deb3c1 | 1839 | *more = 0; |
98211489 ZB |
1840 | ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, |
1841 | sock->sk->sk_protocol, &new_sock); | |
1842 | if (ret) | |
1843 | goto out; | |
1844 | ||
1845 | new_sock->type = sock->type; | |
1846 | new_sock->ops = sock->ops; | |
cdfbabfb | 1847 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK, false); |
98211489 ZB |
1848 | if (ret < 0) |
1849 | goto out; | |
1850 | ||
79deb3c1 | 1851 | *more = 1; |
98211489 ZB |
1852 | new_sock->sk->sk_allocation = GFP_ATOMIC; |
1853 | ||
1854 | ret = o2net_set_nodelay(new_sock); | |
1855 | if (ret) { | |
1856 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); | |
1857 | goto out; | |
1858 | } | |
1859 | ||
8e9801df JB |
1860 | ret = o2net_set_usertimeout(new_sock); |
1861 | if (ret) { | |
1862 | mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret); | |
1863 | goto out; | |
1864 | } | |
1865 | ||
98211489 ZB |
1866 | slen = sizeof(sin); |
1867 | ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, | |
1868 | &slen, 1); | |
1869 | if (ret < 0) | |
1870 | goto out; | |
1871 | ||
97bd7919 | 1872 | node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); |
98211489 | 1873 | if (node == NULL) { |
1dfecf81 SM |
1874 | printk(KERN_NOTICE "o2net: Attempt to connect from unknown " |
1875 | "node at %pI4:%d\n", &sin.sin_addr.s_addr, | |
1876 | ntohs(sin.sin_port)); | |
98211489 ZB |
1877 | ret = -EINVAL; |
1878 | goto out; | |
1879 | } | |
1880 | ||
415cf32c TY |
1881 | if (o2nm_this_node() >= node->nd_num) { |
1882 | local_node = o2nm_get_node_by_num(o2nm_this_node()); | |
03dbe88a JQ |
1883 | if (local_node) |
1884 | printk(KERN_NOTICE "o2net: Unexpected connect attempt " | |
1885 | "seen at node '%s' (%u, %pI4:%d) from " | |
1886 | "node '%s' (%u, %pI4:%d)\n", | |
1887 | local_node->nd_name, local_node->nd_num, | |
1888 | &(local_node->nd_ipv4_address), | |
1889 | ntohs(local_node->nd_ipv4_port), | |
1890 | node->nd_name, | |
1891 | node->nd_num, &sin.sin_addr.s_addr, | |
1892 | ntohs(sin.sin_port)); | |
98211489 ZB |
1893 | ret = -EINVAL; |
1894 | goto out; | |
1895 | } | |
1896 | ||
1897 | /* this happens all the time when the other node sees our heartbeat | |
1898 | * and tries to connect before we see their heartbeat */ | |
1899 | if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { | |
1900 | mlog(ML_CONN, "attempt to connect from node '%s' at " | |
be859405 HH |
1901 | "%pI4:%d but it isn't heartbeating\n", |
1902 | node->nd_name, &sin.sin_addr.s_addr, | |
97bd7919 | 1903 | ntohs(sin.sin_port)); |
98211489 ZB |
1904 | ret = -EINVAL; |
1905 | goto out; | |
1906 | } | |
1907 | ||
1908 | nn = o2net_nn_from_num(node->nd_num); | |
1909 | ||
1910 | spin_lock(&nn->nn_lock); | |
1911 | if (nn->nn_sc) | |
1912 | ret = -EBUSY; | |
1913 | else | |
1914 | ret = 0; | |
1915 | spin_unlock(&nn->nn_lock); | |
1916 | if (ret) { | |
1dfecf81 SM |
1917 | printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' " |
1918 | "at %pI4:%d but it already has an open connection\n", | |
1919 | node->nd_name, &sin.sin_addr.s_addr, | |
1920 | ntohs(sin.sin_port)); | |
98211489 ZB |
1921 | goto out; |
1922 | } | |
1923 | ||
1924 | sc = sc_alloc(node); | |
1925 | if (sc == NULL) { | |
1926 | ret = -ENOMEM; | |
1927 | goto out; | |
1928 | } | |
1929 | ||
1930 | sc->sc_sock = new_sock; | |
1931 | new_sock = NULL; | |
1932 | ||
1933 | spin_lock(&nn->nn_lock); | |
5cc3bf27 | 1934 | atomic_set(&nn->nn_timeout, 0); |
98211489 ZB |
1935 | o2net_set_nn_state(nn, sc, 0, 0); |
1936 | spin_unlock(&nn->nn_lock); | |
1937 | ||
1938 | o2net_register_callbacks(sc->sc_sock->sk, sc); | |
1939 | o2net_sc_queue_work(sc, &sc->sc_rx_work); | |
1940 | ||
828ae6af | 1941 | o2net_initialize_handshake(); |
98211489 ZB |
1942 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
1943 | ||
1944 | out: | |
1945 | if (new_sock) | |
1946 | sock_release(new_sock); | |
1947 | if (node) | |
1948 | o2nm_node_put(node); | |
415cf32c TY |
1949 | if (local_node) |
1950 | o2nm_node_put(local_node); | |
98211489 ZB |
1951 | if (sc) |
1952 | sc_put(sc); | |
b246d3d1 X |
1953 | |
1954 | memalloc_noio_restore(noio_flag); | |
98211489 ZB |
1955 | return ret; |
1956 | } | |
1957 | ||
79deb3c1 TS |
1958 | /* |
1959 | * This function is invoked in response to one or more | |
1960 | * pending accepts at softIRQ level. We must drain the | |
1961 | * entire que before returning. | |
1962 | */ | |
1963 | ||
c4028958 | 1964 | static void o2net_accept_many(struct work_struct *work) |
98211489 | 1965 | { |
c4028958 | 1966 | struct socket *sock = o2net_listen_sock; |
79deb3c1 TS |
1967 | int more; |
1968 | int err; | |
1969 | ||
1970 | /* | |
1971 | * It is critical to note that due to interrupt moderation | |
1972 | * at the network driver level, we can't assume to get a | |
1973 | * softIRQ for every single conn since tcp SYN packets | |
1974 | * can arrive back-to-back, and therefore many pending | |
1975 | * accepts may result in just 1 softIRQ. If we terminate | |
1976 | * the o2net_accept_one() loop upon seeing an err, what happens | |
1977 | * to the rest of the conns in the queue? If no new SYN | |
1978 | * arrives for hours, no softIRQ will be delivered, | |
1979 | * and the connections will just sit in the queue. | |
1980 | */ | |
1981 | ||
1982 | for (;;) { | |
1983 | err = o2net_accept_one(sock, &more); | |
1984 | if (!more) | |
1985 | break; | |
98211489 | 1986 | cond_resched(); |
79deb3c1 | 1987 | } |
98211489 ZB |
1988 | } |
1989 | ||
676d2369 | 1990 | static void o2net_listen_data_ready(struct sock *sk) |
98211489 | 1991 | { |
676d2369 | 1992 | void (*ready)(struct sock *sk); |
98211489 | 1993 | |
e1daca28 | 1994 | read_lock_bh(&sk->sk_callback_lock); |
98211489 ZB |
1995 | ready = sk->sk_user_data; |
1996 | if (ready == NULL) { /* check for teardown race */ | |
1997 | ready = sk->sk_data_ready; | |
1998 | goto out; | |
1999 | } | |
2000 | ||
da8ded40 TS |
2001 | /* This callback may called twice when a new connection |
2002 | * is being established as a child socket inherits everything | |
2003 | * from a parent LISTEN socket, including the data_ready cb of | |
2004 | * the parent. This leads to a hazard. In o2net_accept_one() | |
2005 | * we are still initializing the child socket but have not | |
2006 | * changed the inherited data_ready callback yet when | |
2007 | * data starts arriving. | |
2008 | * We avoid this hazard by checking the state. | |
2009 | * For the listening socket, the state will be TCP_LISTEN; for the new | |
2010 | * socket, will be TCP_ESTABLISHED. Also, in this case, | |
2011 | * sk->sk_user_data is not a valid function pointer. | |
2012 | */ | |
2013 | ||
98211489 | 2014 | if (sk->sk_state == TCP_LISTEN) { |
98211489 | 2015 | queue_work(o2net_wq, &o2net_listen_work); |
da8ded40 TS |
2016 | } else { |
2017 | ready = NULL; | |
98211489 ZB |
2018 | } |
2019 | ||
2020 | out: | |
e1daca28 | 2021 | read_unlock_bh(&sk->sk_callback_lock); |
da8ded40 | 2022 | if (ready != NULL) |
676d2369 | 2023 | ready(sk); |
98211489 ZB |
2024 | } |
2025 | ||
ab81afd3 | 2026 | static int o2net_open_listening_sock(__be32 addr, __be16 port) |
98211489 ZB |
2027 | { |
2028 | struct socket *sock = NULL; | |
2029 | int ret; | |
2030 | struct sockaddr_in sin = { | |
2031 | .sin_family = PF_INET, | |
5fdf1e67 MF |
2032 | .sin_addr = { .s_addr = addr }, |
2033 | .sin_port = port, | |
98211489 ZB |
2034 | }; |
2035 | ||
2036 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); | |
2037 | if (ret < 0) { | |
1dfecf81 | 2038 | printk(KERN_ERR "o2net: Error %d while creating socket\n", ret); |
98211489 ZB |
2039 | goto out; |
2040 | } | |
2041 | ||
2042 | sock->sk->sk_allocation = GFP_ATOMIC; | |
2043 | ||
2044 | write_lock_bh(&sock->sk->sk_callback_lock); | |
2045 | sock->sk->sk_user_data = sock->sk->sk_data_ready; | |
2046 | sock->sk->sk_data_ready = o2net_listen_data_ready; | |
2047 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
2048 | ||
2049 | o2net_listen_sock = sock; | |
c4028958 | 2050 | INIT_WORK(&o2net_listen_work, o2net_accept_many); |
98211489 | 2051 | |
4a17fd52 | 2052 | sock->sk->sk_reuse = SK_CAN_REUSE; |
98211489 ZB |
2053 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); |
2054 | if (ret < 0) { | |
1dfecf81 SM |
2055 | printk(KERN_ERR "o2net: Error %d while binding socket at " |
2056 | "%pI4:%u\n", ret, &addr, ntohs(port)); | |
98211489 ZB |
2057 | goto out; |
2058 | } | |
2059 | ||
2060 | ret = sock->ops->listen(sock, 64); | |
1dfecf81 SM |
2061 | if (ret < 0) |
2062 | printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n", | |
2063 | ret, &addr, ntohs(port)); | |
98211489 ZB |
2064 | |
2065 | out: | |
2066 | if (ret) { | |
2067 | o2net_listen_sock = NULL; | |
2068 | if (sock) | |
2069 | sock_release(sock); | |
2070 | } | |
2071 | return ret; | |
2072 | } | |
2073 | ||
2074 | /* | |
2075 | * called from node manager when we should bring up our network listening | |
2076 | * socket. node manager handles all the serialization to only call this | |
2077 | * once and to match it with o2net_stop_listening(). note, | |
2078 | * o2nm_this_node() doesn't work yet as we're being called while it | |
2079 | * is being set up. | |
2080 | */ | |
2081 | int o2net_start_listening(struct o2nm_node *node) | |
2082 | { | |
2083 | int ret = 0; | |
2084 | ||
2085 | BUG_ON(o2net_wq != NULL); | |
2086 | BUG_ON(o2net_listen_sock != NULL); | |
2087 | ||
2088 | mlog(ML_KTHREAD, "starting o2net thread...\n"); | |
bf940776 | 2089 | o2net_wq = alloc_ordered_workqueue("o2net", WQ_MEM_RECLAIM); |
98211489 ZB |
2090 | if (o2net_wq == NULL) { |
2091 | mlog(ML_ERROR, "unable to launch o2net thread\n"); | |
2092 | return -ENOMEM; /* ? */ | |
2093 | } | |
2094 | ||
ab81afd3 SM |
2095 | ret = o2net_open_listening_sock(node->nd_ipv4_address, |
2096 | node->nd_ipv4_port); | |
98211489 ZB |
2097 | if (ret) { |
2098 | destroy_workqueue(o2net_wq); | |
2099 | o2net_wq = NULL; | |
2100 | } else | |
2101 | o2quo_conn_up(node->nd_num); | |
2102 | ||
2103 | return ret; | |
2104 | } | |
2105 | ||
2106 | /* again, o2nm_this_node() doesn't work here as we're involved in | |
2107 | * tearing it down */ | |
2108 | void o2net_stop_listening(struct o2nm_node *node) | |
2109 | { | |
2110 | struct socket *sock = o2net_listen_sock; | |
2111 | size_t i; | |
2112 | ||
2113 | BUG_ON(o2net_wq == NULL); | |
2114 | BUG_ON(o2net_listen_sock == NULL); | |
2115 | ||
2116 | /* stop the listening socket from generating work */ | |
2117 | write_lock_bh(&sock->sk->sk_callback_lock); | |
2118 | sock->sk->sk_data_ready = sock->sk->sk_user_data; | |
2119 | sock->sk->sk_user_data = NULL; | |
2120 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
2121 | ||
2122 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { | |
2123 | struct o2nm_node *node = o2nm_get_node_by_num(i); | |
2124 | if (node) { | |
2125 | o2net_disconnect_node(node); | |
2126 | o2nm_node_put(node); | |
2127 | } | |
2128 | } | |
2129 | ||
2130 | /* finish all work and tear down the work queue */ | |
2131 | mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); | |
2132 | destroy_workqueue(o2net_wq); | |
2133 | o2net_wq = NULL; | |
2134 | ||
2135 | sock_release(o2net_listen_sock); | |
2136 | o2net_listen_sock = NULL; | |
2137 | ||
2138 | o2quo_conn_err(node->nd_num); | |
2139 | } | |
2140 | ||
2141 | /* ------------------------------------------------------------ */ | |
2142 | ||
2143 | int o2net_init(void) | |
2144 | { | |
2145 | unsigned long i; | |
2146 | ||
2147 | o2quo_init(); | |
2148 | ||
2309e9e0 | 2149 | if (o2net_debugfs_init()) |
4a4e07c1 | 2150 | goto out; |
2309e9e0 | 2151 | |
cd861280 RD |
2152 | o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); |
2153 | o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); | |
2154 | o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); | |
4a4e07c1 JQ |
2155 | if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) |
2156 | goto out; | |
98211489 ZB |
2157 | |
2158 | o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); | |
2159 | o2net_hand->connector_id = cpu_to_be64(1); | |
2160 | ||
2161 | o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); | |
2162 | o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); | |
2163 | ||
2164 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { | |
2165 | struct o2net_node *nn = o2net_nn_from_num(i); | |
2166 | ||
5cc3bf27 | 2167 | atomic_set(&nn->nn_timeout, 0); |
98211489 | 2168 | spin_lock_init(&nn->nn_lock); |
c4028958 DH |
2169 | INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); |
2170 | INIT_DELAYED_WORK(&nn->nn_connect_expired, | |
2171 | o2net_connect_expired); | |
2172 | INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); | |
98211489 ZB |
2173 | /* until we see hb from a node we'll return einval */ |
2174 | nn->nn_persistent_error = -ENOTCONN; | |
2175 | init_waitqueue_head(&nn->nn_sc_wq); | |
2176 | idr_init(&nn->nn_status_idr); | |
2177 | INIT_LIST_HEAD(&nn->nn_status_list); | |
2178 | } | |
2179 | ||
2180 | return 0; | |
4a4e07c1 JQ |
2181 | |
2182 | out: | |
2183 | kfree(o2net_hand); | |
2184 | kfree(o2net_keep_req); | |
2185 | kfree(o2net_keep_resp); | |
fce56d84 | 2186 | o2net_debugfs_exit(); |
4a4e07c1 JQ |
2187 | o2quo_exit(); |
2188 | return -ENOMEM; | |
98211489 ZB |
2189 | } |
2190 | ||
2191 | void o2net_exit(void) | |
2192 | { | |
2193 | o2quo_exit(); | |
2194 | kfree(o2net_hand); | |
2195 | kfree(o2net_keep_req); | |
2196 | kfree(o2net_keep_resp); | |
2309e9e0 | 2197 | o2net_debugfs_exit(); |
98211489 | 2198 | } |