blob: db5ee4b4f47aaf36f698a004fbc99b0f3e722380 [file] [log] [blame]
Zach Brown98211482005-12-15 14:31:23 -08001/* -*- 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>
Trond Myklebust91cf45f2007-11-12 18:10:39 -080061#include <linux/net.h>
Zach Brown98211482005-12-15 14:31:23 -080062#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
Joe Perches03affde2010-03-10 15:20:32 -080075#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
Zach Brown98211482005-12-15 14:31:23 -080076#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
Joe Perches03affde2010-03-10 15:20:32 -080077 &sc->sc_node->nd_ipv4_address, \
Zach Brown98211482005-12-15 14:31:23 -080078 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
Ingo Molnar34af9462006-06-27 02:53:55 -0700104static DEFINE_RWLOCK(o2net_handler_lock);
Zach Brown98211482005-12-15 14:31:23 -0800105static struct rb_root o2net_handler_tree = RB_ROOT;
106
107static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
108
109/* XXX someday we'll need better accounting */
110static 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 */
120static struct workqueue_struct *o2net_wq;
121static struct work_struct o2net_listen_work;
122
123static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
124#define O2NET_HB_PRI 0x1
125
126static struct o2net_handshake *o2net_hand;
127static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
128
129static 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 :/ */
David Howellsc4028952006-11-22 14:57:56 +0000136static void o2net_sc_connect_completed(struct work_struct *work);
137static void o2net_rx_until_empty(struct work_struct *work);
138static void o2net_shutdown_sc(struct work_struct *work);
Zach Brown98211482005-12-15 14:31:23 -0800139static void o2net_listen_data_ready(struct sock *sk, int bytes);
David Howellsc4028952006-11-22 14:57:56 +0000140static void o2net_sc_send_keep_req(struct work_struct *work);
Zach Brown98211482005-12-15 14:31:23 -0800141static void o2net_idle_timer(unsigned long data);
142static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100143static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
144
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700145#ifdef CONFIG_DEBUG_FS
Adrian Bunk18496e82008-08-07 00:11:12 +0300146static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
147 u32 msgkey, struct task_struct *task, u8 node)
Sunil Mushran0f475b22008-05-12 18:31:37 -0700148{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700149 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;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700154}
155
Sunil Mushranff1becb2010-12-22 12:39:39 -0800156static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700157{
Sunil Mushran3f9c14f2010-12-22 12:39:38 -0800158 nst->st_sock_time = ktime_get();
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700159}
160
Sunil Mushranff1becb2010-12-22 12:39:39 -0800161static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700162{
Sunil Mushran3f9c14f2010-12-22 12:39:38 -0800163 nst->st_send_time = ktime_get();
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700164}
165
Adrian Bunk18496e82008-08-07 00:11:12 +0300166static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
167{
Sunil Mushranff1becb2010-12-22 12:39:39 -0800168 nst->st_status_time = ktime_get();
Adrian Bunk18496e82008-08-07 00:11:12 +0300169}
170
171static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
172 struct o2net_sock_container *sc)
173{
Sunil Mushranff1becb2010-12-22 12:39:39 -0800174 nst->st_sc = sc;
Adrian Bunk18496e82008-08-07 00:11:12 +0300175}
176
177static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
178 u32 msg_id)
179{
Sunil Mushranff1becb2010-12-22 12:39:39 -0800180 nst->st_id = msg_id;
Adrian Bunk18496e82008-08-07 00:11:12 +0300181}
182
Sunil Mushranff1becb2010-12-22 12:39:39 -0800183static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
184{
185 sc->sc_tv_timer = ktime_get();
186}
187
188static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
189{
190 sc->sc_tv_data_ready = ktime_get();
191}
192
193static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
194{
195 sc->sc_tv_advance_start = ktime_get();
196}
197
198static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
199{
200 sc->sc_tv_advance_stop = ktime_get();
201}
202
203static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
204{
205 sc->sc_tv_func_start = ktime_get();
206}
207
208static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
209{
210 sc->sc_tv_func_stop = ktime_get();
211}
Sunil Mushrane4530392010-12-22 12:39:41 -0800212
Sunil Mushranff1becb2010-12-22 12:39:39 -0800213#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)
Sunil Mushran0f475b22008-05-12 18:31:37 -0700226#endif /* CONFIG_DEBUG_FS */
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700227
Sunil Mushran3c193b32010-12-22 12:39:40 -0800228#ifdef CONFIG_OCFS2_FS_STATS
Rakib Mullicked599922011-03-18 17:01:08 +0600229static 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
Sunil Mushran3c193b32010-12-22 12:39:40 -0800234static 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
Sunil Mushrane4530392010-12-22 12:39:41 -0800249static 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
Sunil Mushran3c193b32010-12-22 12:39:40 -0800256#else
257
258# define o2net_update_send_stats(a, b)
259
Randy Dunlape70d8452010-12-27 11:55:08 -0800260# define o2net_update_recv_stats(sc)
261
Sunil Mushran3c193b32010-12-22 12:39:40 -0800262#endif /* CONFIG_OCFS2_FS_STATS */
263
Jeff Mahoney409753b2008-03-28 16:44:13 -0700264static inline int o2net_reconnect_delay(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100265{
266 return o2nm_single_cluster->cl_reconnect_delay_ms;
267}
268
Jeff Mahoney409753b2008-03-28 16:44:13 -0700269static inline int o2net_keepalive_delay(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100270{
271 return o2nm_single_cluster->cl_keepalive_delay_ms;
272}
273
Jeff Mahoney409753b2008-03-28 16:44:13 -0700274static inline int o2net_idle_timeout(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100275{
276 return o2nm_single_cluster->cl_idle_timeout_ms;
277}
Zach Brown98211482005-12-15 14:31:23 -0800278
279static 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
290static 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
296static u8 o2net_num_from_nn(struct o2net_node *nn)
297{
298 BUG_ON(nn == NULL);
299 return nn - o2net_nodes;
300}
301
302/* ------------------------------------------------------------ */
303
304static 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
330static 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
346static 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
363out:
364 spin_unlock(&nn->nn_lock);
365 return;
366}
367
368static void o2net_complete_nodes_nsw(struct o2net_node *nn)
369{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200370 struct o2net_status_wait *nsw, *tmp;
Zach Brown98211482005-12-15 14:31:23 -0800371 unsigned int num_kills = 0;
Zach Brown98211482005-12-15 14:31:23 -0800372
373 assert_spin_locked(&nn->nn_lock);
374
Christoph Hellwig800deef2007-05-17 16:03:13 +0200375 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
Zach Brown98211482005-12-15 14:31:23 -0800376 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
384static 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
396static void sc_kref_release(struct kref *kref)
397{
398 struct o2net_sock_container *sc = container_of(kref,
399 struct o2net_sock_container, sc_kref);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100400 BUG_ON(timer_pending(&sc->sc_idle_timeout));
401
Zach Brown98211482005-12-15 14:31:23 -0800402 sclog(sc, "releasing\n");
403
404 if (sc->sc_sock) {
405 sock_release(sc->sc_sock);
406 sc->sc_sock = NULL;
407 }
408
Sunil Mushran2b190ce2010-12-14 14:14:27 -0800409 o2nm_undepend_item(&sc->sc_node->nd_item);
Zach Brown98211482005-12-15 14:31:23 -0800410 o2nm_node_put(sc->sc_node);
411 sc->sc_node = NULL;
412
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700413 o2net_debug_del_sc(sc);
Zach Brown98211482005-12-15 14:31:23 -0800414 kfree(sc);
415}
416
417static void sc_put(struct o2net_sock_container *sc)
418{
419 sclog(sc, "put\n");
420 kref_put(&sc->sc_kref, sc_kref_release);
421}
422static void sc_get(struct o2net_sock_container *sc)
423{
424 sclog(sc, "get\n");
425 kref_get(&sc->sc_kref);
426}
427static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
428{
429 struct o2net_sock_container *sc, *ret = NULL;
430 struct page *page = NULL;
Sunil Mushran2b190ce2010-12-14 14:14:27 -0800431 int status = 0;
Zach Brown98211482005-12-15 14:31:23 -0800432
433 page = alloc_page(GFP_NOFS);
Robert P. J. Daycd861282006-12-13 00:34:52 -0800434 sc = kzalloc(sizeof(*sc), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800435 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
Sunil Mushran2b190ce2010-12-14 14:14:27 -0800442 /* 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 }
David Howellsc4028952006-11-22 14:57:56 +0000449 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);
Zach Brown98211482005-12-15 14:31:23 -0800453
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;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700462 o2net_debug_add_sc(sc);
Zach Brown98211482005-12-15 14:31:23 -0800463 sc = NULL;
464 page = NULL;
465
466out:
467 if (page)
468 __free_page(page);
469 kfree(sc);
470
471 return ret;
472}
473
474/* ------------------------------------------------------------ */
475
476static 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}
483static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000484 struct delayed_work *work,
Zach Brown98211482005-12-15 14:31:23 -0800485 int delay)
486{
487 sc_get(sc);
488 if (!queue_delayed_work(o2net_wq, work, delay))
489 sc_put(sc);
490}
491static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000492 struct delayed_work *work)
Zach Brown98211482005-12-15 14:31:23 -0800493{
494 if (cancel_delayed_work(work))
495 sc_put(sc);
496}
497
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100498static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
499
500int o2net_num_connected_peers(void)
501{
502 return atomic_read(&o2net_connected_peers);
503}
504
Zach Brown98211482005-12-15 14:31:23 -0800505static 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
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100515 if (old_sc && !sc)
516 atomic_dec(&o2net_connected_peers);
517 else if (!old_sc && sc)
518 atomic_inc(&o2net_connected_peers);
519
Zach Brown98211482005-12-15 14:31:23 -0800520 /* 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
Zach Brown98211482005-12-15 14:31:23 -0800526 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) {
Sunil Mushran6efd8062010-02-05 15:41:23 -0800548 printk(KERN_NOTICE "o2net: no longer connected to "
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700549 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
Zach Brown98211482005-12-15 14:31:23 -0800550 o2net_complete_nodes_nsw(nn);
551 }
552
553 if (!was_valid && valid) {
554 o2quo_conn_up(o2net_num_from_nn(nn));
Zach Brown98211482005-12-15 14:31:23 -0800555 cancel_delayed_work(&nn->nn_connect_expired);
Sunil Mushran6efd8062010-02-05 15:41:23 -0800556 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700557 o2nm_this_node() > sc->sc_node->nd_num ?
558 "connected to" : "accepted connection from",
559 SC_NODEF_ARGS(sc));
Zach Brown98211482005-12-15 14:31:23 -0800560 }
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;
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300568 /* delay if we're within a RECONNECT_DELAY of the
Zach Brown98211482005-12-15 14:31:23 -0800569 * last attempt */
570 delay = (nn->nn_last_connect_attempt +
Jeff Mahoney409753b2008-03-28 16:44:13 -0700571 msecs_to_jiffies(o2net_reconnect_delay()))
Zach Brown98211482005-12-15 14:31:23 -0800572 - jiffies;
Jeff Mahoney409753b2008-03-28 16:44:13 -0700573 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
Zach Brown98211482005-12-15 14:31:23 -0800574 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);
Tao Ma5cc3bf22008-03-05 15:50:12 +0800577
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 */
Jeff Mahoney409753b2008-03-28 16:44:13 -0700587 delay += msecs_to_jiffies(o2net_idle_timeout());
Tao Ma5cc3bf22008-03-05 15:50:12 +0800588 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
Zach Brown98211482005-12-15 14:31:23 -0800589 }
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() */
601static 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");
Sunil Mushranff1becb2010-12-22 12:39:39 -0800609 o2net_set_data_ready_time(sc);
Zach Brown98211482005-12-15 14:31:23 -0800610 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() */
621static 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:
Srinivas Eeda23fd9ab2010-03-31 14:32:29 -0700646 printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT
647 " shutdown, state %d\n",
648 SC_NODEF_ARGS(sc), sk->sk_state);
Zach Brown98211482005-12-15 14:31:23 -0800649 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
650 break;
651 }
652out:
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 */
662static 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
Zhen Wei925037b2007-01-23 17:19:59 -0800682 mutex_init(&sc->sc_send_lock);
683
Zach Brown98211482005-12-15 14:31:23 -0800684 write_unlock_bh(&sk->sk_callback_lock);
685}
686
687static 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 */
710static 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 */
David Howellsc4028952006-11-22 14:57:56 +0000728static void o2net_shutdown_sc(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -0800729{
David Howellsc4028952006-11-22 14:57:56 +0000730 struct o2net_sock_container *sc =
731 container_of(work, struct o2net_sock_container,
732 sc_shutdown_work);
Zach Brown98211482005-12-15 14:31:23 -0800733 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);
Trond Myklebust91cf45f2007-11-12 18:10:39 -0800744 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
Zach Brown98211482005-12-15 14:31:23 -0800745 }
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
755static 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
766static struct o2net_msg_handler *
767o2net_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
798static 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
806static 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. */
813int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
814 o2net_msg_handler_func *func, void *data,
Kurt Hackeld74c9802007-01-17 17:04:25 -0800815 o2net_post_msg_handler_func *post_func,
Zach Brown98211482005-12-15 14:31:23 -0800816 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
Robert P. J. Daycd861282006-12-13 00:34:52 -0800842 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800843 if (nmh == NULL) {
844 ret = -ENOMEM;
845 goto out;
846 }
847
848 nmh->nh_func = func;
849 nmh->nh_func_data = data;
Kurt Hackeld74c9802007-01-17 17:04:25 -0800850 nmh->nh_post_func = post_func;
Zach Brown98211482005-12-15 14:31:23 -0800851 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
879out:
880 if (ret)
881 kfree(nmh);
882
883 return ret;
884}
885EXPORT_SYMBOL_GPL(o2net_register_handler);
886
887void o2net_unregister_handler_list(struct list_head *list)
888{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200889 struct o2net_msg_handler *nmh, *n;
Zach Brown98211482005-12-15 14:31:23 -0800890
891 write_lock(&o2net_handler_lock);
Christoph Hellwig800deef2007-05-17 16:03:13 +0200892 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
Zach Brown98211482005-12-15 14:31:23 -0800893 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}
901EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
902
903static 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
918static 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
940static 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;
968out:
969 if (ret < 0)
970 mlog(0, "returning error: %d\n", ret);
971 return ret;
972}
973
974static 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
Sunil Mushrance17204a2007-07-30 11:02:50 -0700981 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 }
Sunil Mushran2bd63212010-01-25 16:57:38 -0800996 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
Zach Brown98211482005-12-15 14:31:23 -0800997 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
998 o2net_ensure_shutdown(nn, sc, 0);
Sunil Mushrance17204a2007-07-30 11:02:50 -0700999 break;
Zach Brown98211482005-12-15 14:31:23 -08001000 }
1001}
1002
1003static 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
1014static 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
1037int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1038 size_t caller_veclen, u8 target_node, int *status)
1039{
Wu Fengguang50aff042010-08-21 14:40:20 +08001040 int ret = 0;
Zach Brown98211482005-12-15 14:31:23 -08001041 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 };
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001049 struct o2net_send_tracking nst;
1050
1051 o2net_init_nst(&nst, msg_type, key, current, target_node);
Zach Brown98211482005-12-15 14:31:23 -08001052
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
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001077 o2net_debug_add_nst(&nst);
1078
1079 o2net_set_nst_sock_time(&nst);
1080
Sunil Mushran9af0b382009-06-11 11:02:03 -07001081 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
Zach Brown98211482005-12-15 14:31:23 -08001082 if (ret)
1083 goto out;
1084
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001085 o2net_set_nst_sock_container(&nst, sc);
1086
Zach Brown98211482005-12-15 14:31:23 -08001087 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);
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001113 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1114
1115 o2net_set_nst_send_time(&nst);
Zach Brown98211482005-12-15 14:31:23 -08001116
1117 /* finally, convert the message header to network byte-order
1118 * and send */
Zhen Wei925037b2007-01-23 17:19:59 -08001119 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001120 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1121 sizeof(struct o2net_msg) + caller_bytes);
Zhen Wei925037b2007-01-23 17:19:59 -08001122 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001123 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 */
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001130 o2net_set_nst_status_time(&nst);
Zach Brown98211482005-12-15 14:31:23 -08001131 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1132
Sunil Mushran3c193b32010-12-22 12:39:40 -08001133 o2net_update_send_stats(&nst, sc);
1134
Zach Brown98211482005-12-15 14:31:23 -08001135 /* 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);
1144out:
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001145 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
Zach Brown98211482005-12-15 14:31:23 -08001146 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}
1155EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1156
1157int 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}
1167EXPORT_SYMBOL_GPL(o2net_send_message);
1168
1169static 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 */
1193static 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;
Kurt Hackeld74c9802007-01-17 17:04:25 -08001200 void *ret_data = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001201
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
Sunil Mushranff1becb2010-12-22 12:39:39 -08001248 o2net_set_func_start_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001249 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),
Kurt Hackeld74c9802007-01-17 17:04:25 -08001253 nmh->nh_func_data, &ret_data);
Sunil Mushranff1becb2010-12-22 12:39:39 -08001254 o2net_set_func_stop_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001255
Sunil Mushrane4530392010-12-22 12:39:41 -08001256 o2net_update_recv_stats(sc);
1257
Zach Brown98211482005-12-15 14:31:23 -08001258out_respond:
1259 /* this destroys the hdr, so don't use it after this */
Zhen Wei925037b2007-01-23 17:19:59 -08001260 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001261 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1262 handler_status);
Zhen Wei925037b2007-01-23 17:19:59 -08001263 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001264 hdr = NULL;
1265 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1266 handler_status, syserr, ret);
1267
Kurt Hackeld74c9802007-01-17 17:04:25 -08001268 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
Zach Brown98211482005-12-15 14:31:23 -08001275out:
1276 if (nmh)
1277 o2net_handler_put(nmh);
1278 return ret;
1279}
1280
1281static 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
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001298 /*
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) !=
Jeff Mahoney409753b2008-03-28 16:44:13 -07001304 o2net_idle_timeout()) {
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001305 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),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001309 o2net_idle_timeout());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001310 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1311 return -1;
1312 }
1313
1314 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
Jeff Mahoney409753b2008-03-28 16:44:13 -07001315 o2net_keepalive_delay()) {
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001316 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),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001320 o2net_keepalive_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001321 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
Zach Brown98211482005-12-15 14:31:23 -08001336 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) {
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001342 o2net_sc_reset_idle_timer(sc);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001343 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001344 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.*/
1359static 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");
Sunil Mushranff1becb2010-12-22 12:39:39 -08001367 o2net_set_advance_start_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001368
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001369 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
Zach Brown98211482005-12-15 14:31:23 -08001386 /* 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;
Zach Brown98211482005-12-15 14:31:23 -08001393 /* 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
1440out:
1441 sclog(sc, "ret = %d\n", ret);
Sunil Mushranff1becb2010-12-22 12:39:39 -08001442 o2net_set_advance_stop_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001443 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. */
David Howellsc4028952006-11-22 14:57:56 +00001449static void o2net_rx_until_empty(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001450{
David Howellsc4028952006-11-22 14:57:56 +00001451 struct o2net_sock_container *sc =
1452 container_of(work, struct o2net_sock_container, sc_rx_work);
Zach Brown98211482005-12-15 14:31:23 -08001453 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
1469static 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
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001494static void o2net_initialize_handshake(void)
1495{
1496 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1497 O2HB_MAX_WRITE_TIMEOUT_MS);
Jeff Mahoney409753b2008-03-28 16:44:13 -07001498 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001499 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
Jeff Mahoney409753b2008-03-28 16:44:13 -07001500 o2net_keepalive_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001501 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
Jeff Mahoney409753b2008-03-28 16:44:13 -07001502 o2net_reconnect_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001503}
1504
Zach Brown98211482005-12-15 14:31:23 -08001505/* ------------------------------------------------------------ */
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 */
David Howellsc4028952006-11-22 14:57:56 +00001509static void o2net_sc_connect_completed(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001510{
David Howellsc4028952006-11-22 14:57:56 +00001511 struct o2net_sock_container *sc =
1512 container_of(work, struct o2net_sock_container,
1513 sc_connect_work);
Zach Brown98211482005-12-15 14:31:23 -08001514
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
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001519 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001520 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1521 sc_put(sc);
1522}
1523
1524/* this is called as a work_struct func. */
David Howellsc4028952006-11-22 14:57:56 +00001525static void o2net_sc_send_keep_req(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001526{
David Howellsc4028952006-11-22 14:57:56 +00001527 struct o2net_sock_container *sc =
1528 container_of(work, struct o2net_sock_container,
1529 sc_keepalive_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001530
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 */
1538static void o2net_idle_timer(unsigned long data)
1539{
1540 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
Tao Ma5cc3bf22008-03-05 15:50:12 +08001541 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
Zach Brown98211482005-12-15 14:31:23 -08001542
Sunil Mushranff1becb2010-12-22 12:39:39 -08001543#ifdef CONFIG_DEBUG_FS
1544 ktime_t now = ktime_get();
1545#endif
Zach Brown98211482005-12-15 14:31:23 -08001546
Sunil Mushran6efd8062010-02-05 15:41:23 -08001547 printk(KERN_NOTICE "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u "
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001548 "seconds, shutting it down.\n", SC_NODEF_ARGS(sc),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001549 o2net_idle_timeout() / 1000,
1550 o2net_idle_timeout() % 1000);
Sunil Mushranff1becb2010-12-22 12:39:39 -08001551
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),
Zach Brown98211482005-12-15 14:31:23 -08001560 sc->sc_msg_key, sc->sc_msg_type,
Sunil Mushranff1becb2010-12-22 12:39:39 -08001561 (long long)ktime_to_us(sc->sc_tv_func_start),
1562 (long long)ktime_to_us(sc->sc_tv_func_stop));
1563#endif
Zach Brown98211482005-12-15 14:31:23 -08001564
Tao Ma5cc3bf22008-03-05 15:50:12 +08001565 /*
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
Zach Brown98211482005-12-15 14:31:23 -08001571 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
1572}
1573
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001574static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
Zach Brown98211482005-12-15 14:31:23 -08001575{
1576 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1577 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
Jeff Mahoney409753b2008-03-28 16:44:13 -07001578 msecs_to_jiffies(o2net_keepalive_delay()));
Sunil Mushranff1becb2010-12-22 12:39:39 -08001579 o2net_set_sock_timer(sc);
Zach Brown98211482005-12-15 14:31:23 -08001580 mod_timer(&sc->sc_idle_timeout,
Jeff Mahoney409753b2008-03-28 16:44:13 -07001581 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001582}
1583
1584static 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);
Zach Brown98211482005-12-15 14:31:23 -08001589}
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 */
David Howellsc4028952006-11-22 14:57:56 +00001596static void o2net_start_connect(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001597{
David Howellsc4028952006-11-22 14:57:56 +00001598 struct o2net_node *nn =
1599 container_of(work, struct o2net_node, nn_connect_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001600 struct o2net_sock_container *sc = NULL;
Sunil Mushranb7668c72006-02-28 23:28:01 -08001601 struct o2nm_node *node = NULL, *mynode = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001602 struct socket *sock = NULL;
1603 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
David Howellsc4028952006-11-22 14:57:56 +00001604 int ret = 0, stop;
Tao Ma5cc3bf22008-03-05 15:50:12 +08001605 unsigned int timeout;
Zach Brown98211482005-12-15 14:31:23 -08001606
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
Sunil Mushranb7668c72006-02-28 23:28:01 -08001618 mynode = o2nm_get_node_by_num(o2nm_this_node());
1619 if (mynode == NULL) {
1620 ret = 0;
1621 goto out;
1622 }
1623
Zach Brown98211482005-12-15 14:31:23 -08001624 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001625 /*
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)));
Zach Brown98211482005-12-15 14:31:23 -08001636 spin_unlock(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00001637 if (stop)
Zach Brown98211482005-12-15 14:31:23 -08001638 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;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001659 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
Al Viro97bd7912007-12-05 08:46:47 +00001660 myaddr.sin_port = htons(0); /* any port */
Zach Brown98211482005-12-15 14:31:23 -08001661
1662 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1663 sizeof(myaddr));
1664 if (ret) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001665 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1666 ret, &mynode->nd_ipv4_address);
Zach Brown98211482005-12-15 14:31:23 -08001667 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;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001684 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1685 remoteaddr.sin_port = node->nd_ipv4_port;
Zach Brown98211482005-12-15 14:31:23 -08001686
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
1694out:
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);
Sunil Mushranb7668c72006-02-28 23:28:01 -08001707 if (mynode)
1708 o2nm_node_put(mynode);
Zach Brown98211482005-12-15 14:31:23 -08001709
1710 return;
1711}
1712
David Howellsc4028952006-11-22 14:57:56 +00001713static void o2net_connect_expired(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001714{
David Howellsc4028952006-11-22 14:57:56 +00001715 struct o2net_node *nn =
1716 container_of(work, struct o2net_node, nn_connect_expired.work);
Zach Brown98211482005-12-15 14:31:23 -08001717
1718 spin_lock(&nn->nn_lock);
1719 if (!nn->nn_sc_valid) {
1720 mlog(ML_ERROR, "no connection established with node %u after "
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001721 "%u.%u seconds, giving up and returning errors.\n",
1722 o2net_num_from_nn(nn),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001723 o2net_idle_timeout() / 1000,
1724 o2net_idle_timeout() % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001725
1726 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1727 }
1728 spin_unlock(&nn->nn_lock);
1729}
1730
David Howellsc4028952006-11-22 14:57:56 +00001731static void o2net_still_up(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001732{
David Howellsc4028952006-11-22 14:57:56 +00001733 struct o2net_node *nn =
1734 container_of(work, struct o2net_node, nn_still_up.work);
Zach Brown98211482005-12-15 14:31:23 -08001735
1736 o2quo_hb_still_up(o2net_num_from_nn(nn));
1737}
1738
1739/* ------------------------------------------------------------ */
1740
1741void 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);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001747 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001748 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
1759static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1760 void *data)
1761{
1762 o2quo_hb_down(node_num);
1763
Sunil Mushran0e105d32010-10-07 17:00:16 -07001764 if (!node)
1765 return;
1766
Zach Brown98211482005-12-15 14:31:23 -08001767 if (node_num != o2nm_this_node())
1768 o2net_disconnect_node(node);
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001769
1770 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
Zach Brown98211482005-12-15 14:31:23 -08001771}
1772
1773static 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
Sunil Mushran0e105d32010-10-07 17:00:16 -07001780 BUG_ON(!node);
1781
Zach Brown98211482005-12-15 14:31:23 -08001782 /* ensure an immediate connect attempt */
1783 nn->nn_last_connect_attempt = jiffies -
Jeff Mahoney409753b2008-03-28 16:44:13 -07001784 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
Zach Brown98211482005-12-15 14:31:23 -08001785
1786 if (node_num != o2nm_this_node()) {
Zach Brown98211482005-12-15 14:31:23 -08001787 /* 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);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001792 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001793 if (nn->nn_persistent_error)
1794 o2net_set_nn_state(nn, NULL, 0, 0);
1795 spin_unlock(&nn->nn_lock);
1796 }
1797}
1798
1799void o2net_unregister_hb_callbacks(void)
1800{
Joel Becker14829422007-06-14 21:40:49 -07001801 o2hb_unregister_callback(NULL, &o2net_hb_up);
1802 o2hb_unregister_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001803}
1804
1805int 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
Joel Becker14829422007-06-14 21:40:49 -07001814 ret = o2hb_register_callback(NULL, &o2net_hb_up);
Zach Brown98211482005-12-15 14:31:23 -08001815 if (ret == 0)
Joel Becker14829422007-06-14 21:40:49 -07001816 ret = o2hb_register_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001817
1818 if (ret)
1819 o2net_unregister_hb_callbacks();
1820
1821 return ret;
1822}
1823
1824/* ------------------------------------------------------------ */
1825
1826static 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;
Tristan Ye415cf322010-08-02 10:00:26 +08001832 struct o2nm_node *local_node = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001833 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
Al Viro97bd7912007-12-05 08:46:47 +00001862 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
Zach Brown98211482005-12-15 14:31:23 -08001863 if (node == NULL) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001864 mlog(ML_NOTICE, "attempt to connect from unknown node at %pI4:%d\n",
1865 &sin.sin_addr.s_addr, ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001866 ret = -EINVAL;
1867 goto out;
1868 }
1869
Tristan Ye415cf322010-08-02 10:00:26 +08001870 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));
Zach Brown98211482005-12-15 14:31:23 -08001879 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 "
Harvey Harrisonbe859402008-10-31 00:56:28 -07001887 "%pI4:%d but it isn't heartbeating\n",
1888 node->nd_name, &sin.sin_addr.s_addr,
Al Viro97bd7912007-12-05 08:46:47 +00001889 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001890 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 "
Harvey Harrisonbe859402008-10-31 00:56:28 -07001904 "%pI4:%d but it already has an open connection\n",
1905 node->nd_name, &sin.sin_addr.s_addr,
Al Viro97bd7912007-12-05 08:46:47 +00001906 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001907 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);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001920 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001921 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
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001927 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001928 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1929
1930out:
1931 if (new_sock)
1932 sock_release(new_sock);
1933 if (node)
1934 o2nm_node_put(node);
Tristan Ye415cf322010-08-02 10:00:26 +08001935 if (local_node)
1936 o2nm_node_put(local_node);
Zach Brown98211482005-12-15 14:31:23 -08001937 if (sc)
1938 sc_put(sc);
1939 return ret;
1940}
1941
David Howellsc4028952006-11-22 14:57:56 +00001942static void o2net_accept_many(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001943{
David Howellsc4028952006-11-22 14:57:56 +00001944 struct socket *sock = o2net_listen_sock;
Zach Brown98211482005-12-15 14:31:23 -08001945 while (o2net_accept_one(sock) == 0)
1946 cond_resched();
1947}
1948
1949static 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
1969out:
1970 read_unlock(&sk->sk_callback_lock);
1971 ready(sk, bytes);
1972}
1973
Sunil Mushranab81afd2007-01-29 14:57:14 -08001974static int o2net_open_listening_sock(__be32 addr, __be16 port)
Zach Brown98211482005-12-15 14:31:23 -08001975{
1976 struct socket *sock = NULL;
1977 int ret;
1978 struct sockaddr_in sin = {
1979 .sin_family = PF_INET,
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001980 .sin_addr = { .s_addr = addr },
1981 .sin_port = port,
Zach Brown98211482005-12-15 14:31:23 -08001982 };
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;
David Howellsc4028952006-11-22 14:57:56 +00001998 INIT_WORK(&o2net_listen_work, o2net_accept_many);
Zach Brown98211482005-12-15 14:31:23 -08001999
2000 sock->sk->sk_reuse = 1;
2001 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
2002 if (ret < 0) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07002003 mlog(ML_ERROR, "unable to bind socket at %pI4:%u, "
2004 "ret=%d\n", &addr, ntohs(port), ret);
Zach Brown98211482005-12-15 14:31:23 -08002005 goto out;
2006 }
2007
2008 ret = sock->ops->listen(sock, 64);
2009 if (ret < 0) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07002010 mlog(ML_ERROR, "unable to listen on %pI4:%u, ret=%d\n",
2011 &addr, ntohs(port), ret);
Zach Brown98211482005-12-15 14:31:23 -08002012 }
2013
2014out:
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 */
2030int 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
Sunil Mushranab81afd2007-01-29 14:57:14 -08002044 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2045 node->nd_ipv4_port);
Zach Brown98211482005-12-15 14:31:23 -08002046 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 */
2057void 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
2092int o2net_init(void)
2093{
2094 unsigned long i;
2095
2096 o2quo_init();
2097
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002098 if (o2net_debugfs_init())
2099 return -ENOMEM;
2100
Robert P. J. Daycd861282006-12-13 00:34:52 -08002101 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);
Zach Brown98211482005-12-15 14:31:23 -08002104 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
Tao Ma5cc3bf22008-03-05 15:50:12 +08002120 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08002121 spin_lock_init(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00002122 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);
Zach Brown98211482005-12-15 14:31:23 -08002126 /* 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
2136void o2net_exit(void)
2137{
2138 o2quo_exit();
2139 kfree(o2net_hand);
2140 kfree(o2net_keep_req);
2141 kfree(o2net_keep_resp);
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002142 o2net_debugfs_exit();
Zach Brown98211482005-12-15 14:31:23 -08002143}