blob: d4b5c81f0445992294dc33b523ab21025940ea76 [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>
Paul Gortmakerafeacc82011-05-26 16:00:52 -040062#include <linux/export.h>
Zach Brown98211482005-12-15 14:31:23 -080063#include <net/tcp.h>
64
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080065#include <linux/uaccess.h>
Zach Brown98211482005-12-15 14:31:23 -080066
67#include "heartbeat.h"
68#include "tcp.h"
69#include "nodemanager.h"
70#define MLOG_MASK_PREFIX ML_TCP
71#include "masklog.h"
72#include "quorum.h"
73
74#include "tcp_internal.h"
75
Joe Perches03affde2010-03-10 15:20:32 -080076#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
Zach Brown98211482005-12-15 14:31:23 -080077#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
Joe Perches03affde2010-03-10 15:20:32 -080078 &sc->sc_node->nd_ipv4_address, \
Zach Brown98211482005-12-15 14:31:23 -080079 ntohs(sc->sc_node->nd_ipv4_port)
80
81/*
82 * In the following two log macros, the whitespace after the ',' just
83 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
84 * previous token if args expands to nothing.
85 */
86#define msglog(hdr, fmt, args...) do { \
87 typeof(hdr) __hdr = (hdr); \
88 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
89 "key %08x num %u] " fmt, \
90 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
91 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
92 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
93 be32_to_cpu(__hdr->msg_num) , ##args); \
94} while (0)
95
96#define sclog(sc, fmt, args...) do { \
97 typeof(sc) __sc = (sc); \
98 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
99 "pg_off %zu] " fmt, __sc, \
100 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
101 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
102 ##args); \
103} while (0)
104
Ingo Molnar34af9462006-06-27 02:53:55 -0700105static DEFINE_RWLOCK(o2net_handler_lock);
Zach Brown98211482005-12-15 14:31:23 -0800106static struct rb_root o2net_handler_tree = RB_ROOT;
107
108static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
109
110/* XXX someday we'll need better accounting */
Fabian Frederick1a5c4e22014-06-04 16:06:06 -0700111static struct socket *o2net_listen_sock;
Zach Brown98211482005-12-15 14:31:23 -0800112
113/*
114 * listen work is only queued by the listening socket callbacks on the
115 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
116 * quorum work is queued as sock containers are shutdown.. stop_listening
117 * tears down all the node's sock containers, preventing future shutdowns
118 * and queued quroum work, before canceling delayed quorum work and
119 * destroying the work queue.
120 */
121static struct workqueue_struct *o2net_wq;
122static struct work_struct o2net_listen_work;
123
124static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
125#define O2NET_HB_PRI 0x1
126
127static struct o2net_handshake *o2net_hand;
128static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
129
130static int o2net_sys_err_translations[O2NET_ERR_MAX] =
131 {[O2NET_ERR_NONE] = 0,
132 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
133 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
134 [O2NET_ERR_DIED] = -EHOSTDOWN,};
135
136/* can't quite avoid *all* internal declarations :/ */
David Howellsc4028952006-11-22 14:57:56 +0000137static void o2net_sc_connect_completed(struct work_struct *work);
138static void o2net_rx_until_empty(struct work_struct *work);
139static void o2net_shutdown_sc(struct work_struct *work);
David S. Miller676d2362014-04-11 16:15:36 -0400140static void o2net_listen_data_ready(struct sock *sk);
David Howellsc4028952006-11-22 14:57:56 +0000141static void o2net_sc_send_keep_req(struct work_struct *work);
Zach Brown98211482005-12-15 14:31:23 -0800142static void o2net_idle_timer(unsigned long data);
143static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100144static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
145
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700146#ifdef CONFIG_DEBUG_FS
Adrian Bunk18496e82008-08-07 00:11:12 +0300147static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
148 u32 msgkey, struct task_struct *task, u8 node)
Sunil Mushran0f475b22008-05-12 18:31:37 -0700149{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700150 INIT_LIST_HEAD(&nst->st_net_debug_item);
151 nst->st_task = task;
152 nst->st_msg_type = msgtype;
153 nst->st_msg_key = msgkey;
154 nst->st_node = node;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700155}
156
Sunil Mushranff1becb2010-12-22 12:39:39 -0800157static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700158{
Sunil Mushran3f9c14f2010-12-22 12:39:38 -0800159 nst->st_sock_time = ktime_get();
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700160}
161
Sunil Mushranff1becb2010-12-22 12:39:39 -0800162static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700163{
Sunil Mushran3f9c14f2010-12-22 12:39:38 -0800164 nst->st_send_time = ktime_get();
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700165}
166
Adrian Bunk18496e82008-08-07 00:11:12 +0300167static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
168{
Sunil Mushranff1becb2010-12-22 12:39:39 -0800169 nst->st_status_time = ktime_get();
Adrian Bunk18496e82008-08-07 00:11:12 +0300170}
171
172static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
173 struct o2net_sock_container *sc)
174{
Sunil Mushranff1becb2010-12-22 12:39:39 -0800175 nst->st_sc = sc;
Adrian Bunk18496e82008-08-07 00:11:12 +0300176}
177
178static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
179 u32 msg_id)
180{
Sunil Mushranff1becb2010-12-22 12:39:39 -0800181 nst->st_id = msg_id;
Adrian Bunk18496e82008-08-07 00:11:12 +0300182}
183
Sunil Mushranff1becb2010-12-22 12:39:39 -0800184static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
185{
186 sc->sc_tv_timer = ktime_get();
187}
188
189static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
190{
191 sc->sc_tv_data_ready = ktime_get();
192}
193
194static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
195{
196 sc->sc_tv_advance_start = ktime_get();
197}
198
199static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
200{
201 sc->sc_tv_advance_stop = ktime_get();
202}
203
204static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
205{
206 sc->sc_tv_func_start = ktime_get();
207}
208
209static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
210{
211 sc->sc_tv_func_stop = ktime_get();
212}
Sunil Mushrane4530392010-12-22 12:39:41 -0800213
Sunil Mushranff1becb2010-12-22 12:39:39 -0800214#else /* CONFIG_DEBUG_FS */
215# define o2net_init_nst(a, b, c, d, e)
216# define o2net_set_nst_sock_time(a)
217# define o2net_set_nst_send_time(a)
218# define o2net_set_nst_status_time(a)
219# define o2net_set_nst_sock_container(a, b)
220# define o2net_set_nst_msg_id(a, b)
221# define o2net_set_sock_timer(a)
222# define o2net_set_data_ready_time(a)
223# define o2net_set_advance_start_time(a)
224# define o2net_set_advance_stop_time(a)
225# define o2net_set_func_start_time(a)
226# define o2net_set_func_stop_time(a)
Sunil Mushran0f475b22008-05-12 18:31:37 -0700227#endif /* CONFIG_DEBUG_FS */
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700228
Sunil Mushran3c193b32010-12-22 12:39:40 -0800229#ifdef CONFIG_OCFS2_FS_STATS
Rakib Mullicked599922011-03-18 17:01:08 +0600230static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc)
231{
232 return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
233}
234
Sunil Mushran3c193b32010-12-22 12:39:40 -0800235static void o2net_update_send_stats(struct o2net_send_tracking *nst,
236 struct o2net_sock_container *sc)
237{
238 sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
239 ktime_sub(ktime_get(),
240 nst->st_status_time));
241 sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
242 ktime_sub(nst->st_status_time,
243 nst->st_send_time));
244 sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
245 ktime_sub(nst->st_send_time,
246 nst->st_sock_time));
247 sc->sc_send_count++;
248}
249
Sunil Mushrane4530392010-12-22 12:39:41 -0800250static void o2net_update_recv_stats(struct o2net_sock_container *sc)
251{
252 sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
253 o2net_get_func_run_time(sc));
254 sc->sc_recv_count++;
255}
256
Sunil Mushran3c193b32010-12-22 12:39:40 -0800257#else
258
259# define o2net_update_send_stats(a, b)
260
Randy Dunlape70d8452010-12-27 11:55:08 -0800261# define o2net_update_recv_stats(sc)
262
Sunil Mushran3c193b32010-12-22 12:39:40 -0800263#endif /* CONFIG_OCFS2_FS_STATS */
264
Joseph Qi41b63ef2014-04-03 14:47:00 -0700265static inline unsigned int o2net_reconnect_delay(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100266{
267 return o2nm_single_cluster->cl_reconnect_delay_ms;
268}
269
Joseph Qi41b63ef2014-04-03 14:47:00 -0700270static inline unsigned int o2net_keepalive_delay(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100271{
272 return o2nm_single_cluster->cl_keepalive_delay_ms;
273}
274
Joseph Qi41b63ef2014-04-03 14:47:00 -0700275static inline unsigned int o2net_idle_timeout(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100276{
277 return o2nm_single_cluster->cl_idle_timeout_ms;
278}
Zach Brown98211482005-12-15 14:31:23 -0800279
280static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
281{
282 int trans;
283 BUG_ON(err >= O2NET_ERR_MAX);
284 trans = o2net_sys_err_translations[err];
285
286 /* Just in case we mess up the translation table above */
287 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
288 return trans;
289}
290
291static struct o2net_node * o2net_nn_from_num(u8 node_num)
292{
293 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
294 return &o2net_nodes[node_num];
295}
296
297static u8 o2net_num_from_nn(struct o2net_node *nn)
298{
299 BUG_ON(nn == NULL);
300 return nn - o2net_nodes;
301}
302
303/* ------------------------------------------------------------ */
304
305static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
306{
Tejun Heo6b207ba2013-02-27 17:04:51 -0800307 int ret;
Zach Brown98211482005-12-15 14:31:23 -0800308
Tejun Heo6b207ba2013-02-27 17:04:51 -0800309 spin_lock(&nn->nn_lock);
310 ret = idr_alloc(&nn->nn_status_idr, nsw, 0, 0, GFP_ATOMIC);
311 if (ret >= 0) {
312 nsw->ns_id = ret;
313 list_add_tail(&nsw->ns_node_item, &nn->nn_status_list);
Zach Brown98211482005-12-15 14:31:23 -0800314 }
Tejun Heo6b207ba2013-02-27 17:04:51 -0800315 spin_unlock(&nn->nn_lock);
316 if (ret < 0)
317 return ret;
Zach Brown98211482005-12-15 14:31:23 -0800318
Tejun Heo6b207ba2013-02-27 17:04:51 -0800319 init_waitqueue_head(&nsw->ns_wq);
320 nsw->ns_sys_status = O2NET_ERR_NONE;
321 nsw->ns_status = 0;
322 return 0;
Zach Brown98211482005-12-15 14:31:23 -0800323}
324
325static void o2net_complete_nsw_locked(struct o2net_node *nn,
326 struct o2net_status_wait *nsw,
327 enum o2net_system_error sys_status,
328 s32 status)
329{
330 assert_spin_locked(&nn->nn_lock);
331
332 if (!list_empty(&nsw->ns_node_item)) {
333 list_del_init(&nsw->ns_node_item);
334 nsw->ns_sys_status = sys_status;
335 nsw->ns_status = status;
336 idr_remove(&nn->nn_status_idr, nsw->ns_id);
337 wake_up(&nsw->ns_wq);
338 }
339}
340
341static void o2net_complete_nsw(struct o2net_node *nn,
342 struct o2net_status_wait *nsw,
343 u64 id, enum o2net_system_error sys_status,
344 s32 status)
345{
346 spin_lock(&nn->nn_lock);
347 if (nsw == NULL) {
348 if (id > INT_MAX)
349 goto out;
350
351 nsw = idr_find(&nn->nn_status_idr, id);
352 if (nsw == NULL)
353 goto out;
354 }
355
356 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
357
358out:
359 spin_unlock(&nn->nn_lock);
360 return;
361}
362
363static void o2net_complete_nodes_nsw(struct o2net_node *nn)
364{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200365 struct o2net_status_wait *nsw, *tmp;
Zach Brown98211482005-12-15 14:31:23 -0800366 unsigned int num_kills = 0;
Zach Brown98211482005-12-15 14:31:23 -0800367
368 assert_spin_locked(&nn->nn_lock);
369
Christoph Hellwig800deef2007-05-17 16:03:13 +0200370 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
Zach Brown98211482005-12-15 14:31:23 -0800371 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
372 num_kills++;
373 }
374
375 mlog(0, "completed %d messages for node %u\n", num_kills,
376 o2net_num_from_nn(nn));
377}
378
379static int o2net_nsw_completed(struct o2net_node *nn,
380 struct o2net_status_wait *nsw)
381{
382 int completed;
383 spin_lock(&nn->nn_lock);
384 completed = list_empty(&nsw->ns_node_item);
385 spin_unlock(&nn->nn_lock);
386 return completed;
387}
388
389/* ------------------------------------------------------------ */
390
391static void sc_kref_release(struct kref *kref)
392{
393 struct o2net_sock_container *sc = container_of(kref,
394 struct o2net_sock_container, sc_kref);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100395 BUG_ON(timer_pending(&sc->sc_idle_timeout));
396
Zach Brown98211482005-12-15 14:31:23 -0800397 sclog(sc, "releasing\n");
398
399 if (sc->sc_sock) {
400 sock_release(sc->sc_sock);
401 sc->sc_sock = NULL;
402 }
403
Sunil Mushran2b190ce2010-12-14 14:14:27 -0800404 o2nm_undepend_item(&sc->sc_node->nd_item);
Zach Brown98211482005-12-15 14:31:23 -0800405 o2nm_node_put(sc->sc_node);
406 sc->sc_node = NULL;
407
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700408 o2net_debug_del_sc(sc);
Younger Liud3e3b412013-07-03 15:00:54 -0700409
410 if (sc->sc_page)
411 __free_page(sc->sc_page);
Zach Brown98211482005-12-15 14:31:23 -0800412 kfree(sc);
413}
414
415static void sc_put(struct o2net_sock_container *sc)
416{
417 sclog(sc, "put\n");
418 kref_put(&sc->sc_kref, sc_kref_release);
419}
420static void sc_get(struct o2net_sock_container *sc)
421{
422 sclog(sc, "get\n");
423 kref_get(&sc->sc_kref);
424}
425static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
426{
427 struct o2net_sock_container *sc, *ret = NULL;
428 struct page *page = NULL;
Sunil Mushran2b190ce2010-12-14 14:14:27 -0800429 int status = 0;
Zach Brown98211482005-12-15 14:31:23 -0800430
431 page = alloc_page(GFP_NOFS);
Robert P. J. Daycd861282006-12-13 00:34:52 -0800432 sc = kzalloc(sizeof(*sc), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800433 if (sc == NULL || page == NULL)
434 goto out;
435
436 kref_init(&sc->sc_kref);
437 o2nm_node_get(node);
438 sc->sc_node = node;
439
Sunil Mushran2b190ce2010-12-14 14:14:27 -0800440 /* pin the node item of the remote node */
441 status = o2nm_depend_item(&node->nd_item);
442 if (status) {
443 mlog_errno(status);
444 o2nm_node_put(node);
445 goto out;
446 }
David Howellsc4028952006-11-22 14:57:56 +0000447 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
448 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
449 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
450 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
Zach Brown98211482005-12-15 14:31:23 -0800451
452 init_timer(&sc->sc_idle_timeout);
453 sc->sc_idle_timeout.function = o2net_idle_timer;
454 sc->sc_idle_timeout.data = (unsigned long)sc;
455
456 sclog(sc, "alloced\n");
457
458 ret = sc;
459 sc->sc_page = page;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700460 o2net_debug_add_sc(sc);
Zach Brown98211482005-12-15 14:31:23 -0800461 sc = NULL;
462 page = NULL;
463
464out:
465 if (page)
466 __free_page(page);
467 kfree(sc);
468
469 return ret;
470}
471
472/* ------------------------------------------------------------ */
473
474static void o2net_sc_queue_work(struct o2net_sock_container *sc,
475 struct work_struct *work)
476{
477 sc_get(sc);
478 if (!queue_work(o2net_wq, work))
479 sc_put(sc);
480}
481static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000482 struct delayed_work *work,
Zach Brown98211482005-12-15 14:31:23 -0800483 int delay)
484{
485 sc_get(sc);
486 if (!queue_delayed_work(o2net_wq, work, delay))
487 sc_put(sc);
488}
489static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000490 struct delayed_work *work)
Zach Brown98211482005-12-15 14:31:23 -0800491{
492 if (cancel_delayed_work(work))
493 sc_put(sc);
494}
495
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100496static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
497
498int o2net_num_connected_peers(void)
499{
500 return atomic_read(&o2net_connected_peers);
501}
502
Zach Brown98211482005-12-15 14:31:23 -0800503static void o2net_set_nn_state(struct o2net_node *nn,
504 struct o2net_sock_container *sc,
505 unsigned valid, int err)
506{
507 int was_valid = nn->nn_sc_valid;
508 int was_err = nn->nn_persistent_error;
509 struct o2net_sock_container *old_sc = nn->nn_sc;
510
511 assert_spin_locked(&nn->nn_lock);
512
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100513 if (old_sc && !sc)
514 atomic_dec(&o2net_connected_peers);
515 else if (!old_sc && sc)
516 atomic_inc(&o2net_connected_peers);
517
Zach Brown98211482005-12-15 14:31:23 -0800518 /* the node num comparison and single connect/accept path should stop
519 * an non-null sc from being overwritten with another */
520 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
521 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
522 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
523
Zach Brown98211482005-12-15 14:31:23 -0800524 if (was_valid && !valid && err == 0)
525 err = -ENOTCONN;
526
527 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
528 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
529 nn->nn_persistent_error, err);
530
531 nn->nn_sc = sc;
532 nn->nn_sc_valid = valid ? 1 : 0;
533 nn->nn_persistent_error = err;
534
535 /* mirrors o2net_tx_can_proceed() */
536 if (nn->nn_persistent_error || nn->nn_sc_valid)
537 wake_up(&nn->nn_sc_wq);
538
Junxiao Bi5046f182014-10-09 15:25:11 -0700539 if (was_valid && !was_err && nn->nn_persistent_error) {
Zach Brown98211482005-12-15 14:31:23 -0800540 o2quo_conn_err(o2net_num_from_nn(nn));
541 queue_delayed_work(o2net_wq, &nn->nn_still_up,
542 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
543 }
544
545 if (was_valid && !valid) {
Sunil Mushran8dd79032013-09-11 14:19:49 -0700546 if (old_sc)
547 printk(KERN_NOTICE "o2net: No longer connected to "
548 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
Zach Brown98211482005-12-15 14:31:23 -0800549 o2net_complete_nodes_nsw(nn);
550 }
551
552 if (!was_valid && valid) {
553 o2quo_conn_up(o2net_num_from_nn(nn));
Zach Brown98211482005-12-15 14:31:23 -0800554 cancel_delayed_work(&nn->nn_connect_expired);
Sunil Mushran6efd8062010-02-05 15:41:23 -0800555 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700556 o2nm_this_node() > sc->sc_node->nd_num ?
Sunil Mushran1dfecf82011-07-24 10:22:54 -0700557 "Connected to" : "Accepted connection from",
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700558 SC_NODEF_ARGS(sc));
Zach Brown98211482005-12-15 14:31:23 -0800559 }
560
561 /* trigger the connecting worker func as long as we're not valid,
562 * it will back off if it shouldn't connect. This can be called
563 * from node config teardown and so needs to be careful about
564 * the work queue actually being up. */
565 if (!valid && o2net_wq) {
566 unsigned long delay;
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300567 /* delay if we're within a RECONNECT_DELAY of the
Zach Brown98211482005-12-15 14:31:23 -0800568 * last attempt */
569 delay = (nn->nn_last_connect_attempt +
Jeff Mahoney409753b2008-03-28 16:44:13 -0700570 msecs_to_jiffies(o2net_reconnect_delay()))
Zach Brown98211482005-12-15 14:31:23 -0800571 - jiffies;
Jeff Mahoney409753b2008-03-28 16:44:13 -0700572 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
Zach Brown98211482005-12-15 14:31:23 -0800573 delay = 0;
574 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
575 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
Tao Ma5cc3bf22008-03-05 15:50:12 +0800576
577 /*
578 * Delay the expired work after idle timeout.
579 *
580 * We might have lots of failed connection attempts that run
581 * through here but we only cancel the connect_expired work when
582 * a connection attempt succeeds. So only the first enqueue of
583 * the connect_expired work will do anything. The rest will see
584 * that it's already queued and do nothing.
585 */
Jeff Mahoney409753b2008-03-28 16:44:13 -0700586 delay += msecs_to_jiffies(o2net_idle_timeout());
Tao Ma5cc3bf22008-03-05 15:50:12 +0800587 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
Zach Brown98211482005-12-15 14:31:23 -0800588 }
589
590 /* keep track of the nn's sc ref for the caller */
591 if ((old_sc == NULL) && sc)
592 sc_get(sc);
593 if (old_sc && (old_sc != sc)) {
594 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
595 sc_put(old_sc);
596 }
597}
598
599/* see o2net_register_callbacks() */
David S. Miller676d2362014-04-11 16:15:36 -0400600static void o2net_data_ready(struct sock *sk)
Zach Brown98211482005-12-15 14:31:23 -0800601{
David S. Miller676d2362014-04-11 16:15:36 -0400602 void (*ready)(struct sock *sk);
Eric Dumazete1daca22016-05-17 17:44:07 -0700603 struct o2net_sock_container *sc;
Zach Brown98211482005-12-15 14:31:23 -0800604
Eric Dumazete1daca22016-05-17 17:44:07 -0700605 read_lock_bh(&sk->sk_callback_lock);
606 sc = sk->sk_user_data;
607 if (sc) {
Zach Brown98211482005-12-15 14:31:23 -0800608 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 }
Eric Dumazete1daca22016-05-17 17:44:07 -0700615 read_unlock_bh(&sk->sk_callback_lock);
Zach Brown98211482005-12-15 14:31:23 -0800616
David S. Miller676d2362014-04-11 16:15:36 -0400617 ready(sk);
Zach Brown98211482005-12-15 14:31:23 -0800618}
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
Eric Dumazete1daca22016-05-17 17:44:07 -0700626 read_lock_bh(&sk->sk_callback_lock);
Zach Brown98211482005-12-15 14:31:23 -0800627 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) {
Jie Liu44e89cb2013-07-03 15:01:08 -0700638 /* ignore connecting sockets as they make progress */
639 case TCP_SYN_SENT:
640 case TCP_SYN_RECV:
641 break;
642 case TCP_ESTABLISHED:
643 o2net_sc_queue_work(sc, &sc->sc_connect_work);
644 break;
645 default:
646 printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT
647 " shutdown, state %d\n",
648 SC_NODEF_ARGS(sc), sk->sk_state);
649 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
650 break;
Zach Brown98211482005-12-15 14:31:23 -0800651 }
652out:
Eric Dumazete1daca22016-05-17 17:44:07 -0700653 read_unlock_bh(&sk->sk_callback_lock);
Zach Brown98211482005-12-15 14:31:23 -0800654 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{
Joseph Qi9a239e42013-09-11 14:20:00 -0700770 struct rb_node **p = &o2net_handler_tree.rb_node;
771 struct rb_node *parent = NULL;
Zach Brown98211482005-12-15 14:31:23 -0800772 struct o2net_msg_handler *nmh, *ret = NULL;
773 int cmp;
774
Joseph Qi9a239e42013-09-11 14:20:00 -0700775 while (*p) {
776 parent = *p;
777 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
Zach Brown98211482005-12-15 14:31:23 -0800778 cmp = o2net_handler_cmp(nmh, msg_type, key);
779
Joseph Qi9a239e42013-09-11 14:20:00 -0700780 if (cmp < 0)
781 p = &(*p)->rb_left;
782 else if (cmp > 0)
783 p = &(*p)->rb_right;
784 else {
Zach Brown98211482005-12-15 14:31:23 -0800785 ret = nmh;
Joseph Qi9a239e42013-09-11 14:20:00 -0700786 break;
Zach Brown98211482005-12-15 14:31:23 -0800787 }
Joseph Qi9a239e42013-09-11 14:20:00 -0700788 }
Zach Brown98211482005-12-15 14:31:23 -0800789
Joseph Qi9a239e42013-09-11 14:20:00 -0700790 if (ret_p != NULL)
791 *ret_p = p;
792 if (ret_parent != NULL)
793 *ret_parent = parent;
Zach Brown98211482005-12-15 14:31:23 -0800794
Joseph Qi9a239e42013-09-11 14:20:00 -0700795 return ret;
Zach Brown98211482005-12-15 14:31:23 -0800796}
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,
Masanari Iida8a168ca2012-12-29 02:00:09 +0900872 "couldn't find handler we *just* registered "
Zach Brown98211482005-12-15 14:31:23 -0800873 "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{
Al Viro920220c2014-02-08 21:09:07 -0500920 struct kvec vec = { .iov_len = len, .iov_base = data, };
921 struct msghdr msg = { .msg_flags = MSG_DONTWAIT, };
922 return kernel_recvmsg(sock, &msg, &vec, 1, len, msg.msg_flags);
Zach Brown98211482005-12-15 14:31:23 -0800923}
924
925static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
926 size_t veclen, size_t total)
927{
928 int ret;
Al Viro7e8631e2014-11-05 15:18:29 -0500929 struct msghdr msg = {.msg_flags = 0,};
Zach Brown98211482005-12-15 14:31:23 -0800930
931 if (sock == NULL) {
932 ret = -EINVAL;
933 goto out;
934 }
935
Al Viro66f5dce2014-02-08 13:27:03 -0500936 ret = kernel_sendmsg(sock, &msg, vec, veclen, total);
937 if (likely(ret == total))
938 return 0;
939 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, total);
940 if (ret >= 0)
941 ret = -EPIPE; /* should be smarter, I bet */
Zach Brown98211482005-12-15 14:31:23 -0800942out:
Al Viro66f5dce2014-02-08 13:27:03 -0500943 mlog(0, "returning error: %d\n", ret);
Zach Brown98211482005-12-15 14:31:23 -0800944 return ret;
945}
946
947static void o2net_sendpage(struct o2net_sock_container *sc,
948 void *kmalloced_virt,
949 size_t size)
950{
951 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
952 ssize_t ret;
953
Sunil Mushrance17204a2007-07-30 11:02:50 -0700954 while (1) {
955 mutex_lock(&sc->sc_send_lock);
956 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
957 virt_to_page(kmalloced_virt),
958 (long)kmalloced_virt & ~PAGE_MASK,
959 size, MSG_DONTWAIT);
960 mutex_unlock(&sc->sc_send_lock);
961 if (ret == size)
962 break;
963 if (ret == (ssize_t)-EAGAIN) {
964 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
965 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
966 cond_resched();
967 continue;
968 }
Sunil Mushran2bd63212010-01-25 16:57:38 -0800969 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
Zach Brown98211482005-12-15 14:31:23 -0800970 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
971 o2net_ensure_shutdown(nn, sc, 0);
Sunil Mushrance17204a2007-07-30 11:02:50 -0700972 break;
Zach Brown98211482005-12-15 14:31:23 -0800973 }
974}
975
976static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
977{
978 memset(msg, 0, sizeof(struct o2net_msg));
979 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
980 msg->data_len = cpu_to_be16(data_len);
981 msg->msg_type = cpu_to_be16(msg_type);
982 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
983 msg->status = 0;
984 msg->key = cpu_to_be32(key);
985}
986
987static int o2net_tx_can_proceed(struct o2net_node *nn,
988 struct o2net_sock_container **sc_ret,
989 int *error)
990{
991 int ret = 0;
992
993 spin_lock(&nn->nn_lock);
994 if (nn->nn_persistent_error) {
995 ret = 1;
996 *sc_ret = NULL;
997 *error = nn->nn_persistent_error;
998 } else if (nn->nn_sc_valid) {
999 kref_get(&nn->nn_sc->sc_kref);
1000
1001 ret = 1;
1002 *sc_ret = nn->nn_sc;
1003 *error = 0;
1004 }
1005 spin_unlock(&nn->nn_lock);
1006
1007 return ret;
1008}
1009
Sunil Mushran3ba169c2011-07-24 10:32:54 -07001010/* Get a map of all nodes to which this node is currently connected to */
1011void o2net_fill_node_map(unsigned long *map, unsigned bytes)
1012{
1013 struct o2net_sock_container *sc;
1014 int node, ret;
1015
1016 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1017
1018 memset(map, 0, bytes);
1019 for (node = 0; node < O2NM_MAX_NODES; ++node) {
Dan Carpentere6d9f862015-02-10 14:09:10 -08001020 if (!o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret))
1021 continue;
Sunil Mushran3ba169c2011-07-24 10:32:54 -07001022 if (!ret) {
1023 set_bit(node, map);
1024 sc_put(sc);
1025 }
1026 }
1027}
1028EXPORT_SYMBOL_GPL(o2net_fill_node_map);
1029
Zach Brown98211482005-12-15 14:31:23 -08001030int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1031 size_t caller_veclen, u8 target_node, int *status)
1032{
Wu Fengguang50aff042010-08-21 14:40:20 +08001033 int ret = 0;
Zach Brown98211482005-12-15 14:31:23 -08001034 struct o2net_msg *msg = NULL;
1035 size_t veclen, caller_bytes = 0;
1036 struct kvec *vec = NULL;
1037 struct o2net_sock_container *sc = NULL;
1038 struct o2net_node *nn = o2net_nn_from_num(target_node);
1039 struct o2net_status_wait nsw = {
1040 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
1041 };
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001042 struct o2net_send_tracking nst;
1043
1044 o2net_init_nst(&nst, msg_type, key, current, target_node);
Zach Brown98211482005-12-15 14:31:23 -08001045
1046 if (o2net_wq == NULL) {
1047 mlog(0, "attempt to tx without o2netd running\n");
1048 ret = -ESRCH;
1049 goto out;
1050 }
1051
1052 if (caller_veclen == 0) {
1053 mlog(0, "bad kvec array length\n");
1054 ret = -EINVAL;
1055 goto out;
1056 }
1057
1058 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1059 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1060 mlog(0, "total payload len %zu too large\n", caller_bytes);
1061 ret = -EINVAL;
1062 goto out;
1063 }
1064
1065 if (target_node == o2nm_this_node()) {
1066 ret = -ELOOP;
1067 goto out;
1068 }
1069
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001070 o2net_debug_add_nst(&nst);
1071
1072 o2net_set_nst_sock_time(&nst);
1073
Sunil Mushran9af0b382009-06-11 11:02:03 -07001074 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
Zach Brown98211482005-12-15 14:31:23 -08001075 if (ret)
1076 goto out;
1077
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001078 o2net_set_nst_sock_container(&nst, sc);
1079
Zach Brown98211482005-12-15 14:31:23 -08001080 veclen = caller_veclen + 1;
1081 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
1082 if (vec == NULL) {
1083 mlog(0, "failed to %zu element kvec!\n", veclen);
1084 ret = -ENOMEM;
1085 goto out;
1086 }
1087
1088 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1089 if (!msg) {
1090 mlog(0, "failed to allocate a o2net_msg!\n");
1091 ret = -ENOMEM;
1092 goto out;
1093 }
1094
1095 o2net_init_msg(msg, caller_bytes, msg_type, key);
1096
1097 vec[0].iov_len = sizeof(struct o2net_msg);
1098 vec[0].iov_base = msg;
1099 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1100
1101 ret = o2net_prep_nsw(nn, &nsw);
1102 if (ret)
1103 goto out;
1104
1105 msg->msg_num = cpu_to_be32(nsw.ns_id);
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001106 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1107
1108 o2net_set_nst_send_time(&nst);
Zach Brown98211482005-12-15 14:31:23 -08001109
1110 /* finally, convert the message header to network byte-order
1111 * and send */
Zhen Wei925037b2007-01-23 17:19:59 -08001112 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001113 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1114 sizeof(struct o2net_msg) + caller_bytes);
Zhen Wei925037b2007-01-23 17:19:59 -08001115 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001116 msglog(msg, "sending returned %d\n", ret);
1117 if (ret < 0) {
1118 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1119 goto out;
1120 }
1121
1122 /* wait on other node's handler */
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001123 o2net_set_nst_status_time(&nst);
Zach Brown98211482005-12-15 14:31:23 -08001124 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1125
Sunil Mushran3c193b32010-12-22 12:39:40 -08001126 o2net_update_send_stats(&nst, sc);
1127
Zach Brown98211482005-12-15 14:31:23 -08001128 /* Note that we avoid overwriting the callers status return
1129 * variable if a system error was reported on the other
1130 * side. Callers beware. */
1131 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1132 if (status && !ret)
1133 *status = nsw.ns_status;
1134
1135 mlog(0, "woken, returning system status %d, user status %d\n",
1136 ret, nsw.ns_status);
1137out:
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001138 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
Zach Brown98211482005-12-15 14:31:23 -08001139 if (sc)
1140 sc_put(sc);
Tim Gardnerd787ab02013-02-21 16:42:44 -08001141 kfree(vec);
1142 kfree(msg);
Zach Brown98211482005-12-15 14:31:23 -08001143 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1144 return ret;
1145}
1146EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1147
1148int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1149 u8 target_node, int *status)
1150{
1151 struct kvec vec = {
1152 .iov_base = data,
1153 .iov_len = len,
1154 };
1155 return o2net_send_message_vec(msg_type, key, &vec, 1,
1156 target_node, status);
1157}
1158EXPORT_SYMBOL_GPL(o2net_send_message);
1159
1160static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1161 enum o2net_system_error syserr, int err)
1162{
1163 struct kvec vec = {
1164 .iov_base = hdr,
1165 .iov_len = sizeof(struct o2net_msg),
1166 };
1167
1168 BUG_ON(syserr >= O2NET_ERR_MAX);
1169
1170 /* leave other fields intact from the incoming message, msg_num
1171 * in particular */
1172 hdr->sys_status = cpu_to_be32(syserr);
1173 hdr->status = cpu_to_be32(err);
1174 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1175 hdr->data_len = 0;
1176
1177 msglog(hdr, "about to send status magic %d\n", err);
1178 /* hdr has been in host byteorder this whole time */
1179 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1180}
1181
1182/* this returns -errno if the header was unknown or too large, etc.
1183 * after this is called the buffer us reused for the next message */
1184static int o2net_process_message(struct o2net_sock_container *sc,
1185 struct o2net_msg *hdr)
1186{
1187 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1188 int ret = 0, handler_status;
1189 enum o2net_system_error syserr;
1190 struct o2net_msg_handler *nmh = NULL;
Kurt Hackeld74c9802007-01-17 17:04:25 -08001191 void *ret_data = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001192
1193 msglog(hdr, "processing message\n");
1194
1195 o2net_sc_postpone_idle(sc);
1196
1197 switch(be16_to_cpu(hdr->magic)) {
1198 case O2NET_MSG_STATUS_MAGIC:
1199 /* special type for returning message status */
1200 o2net_complete_nsw(nn, NULL,
1201 be32_to_cpu(hdr->msg_num),
1202 be32_to_cpu(hdr->sys_status),
1203 be32_to_cpu(hdr->status));
1204 goto out;
1205 case O2NET_MSG_KEEP_REQ_MAGIC:
1206 o2net_sendpage(sc, o2net_keep_resp,
1207 sizeof(*o2net_keep_resp));
1208 goto out;
1209 case O2NET_MSG_KEEP_RESP_MAGIC:
1210 goto out;
1211 case O2NET_MSG_MAGIC:
1212 break;
1213 default:
1214 msglog(hdr, "bad magic\n");
1215 ret = -EINVAL;
1216 goto out;
1217 break;
1218 }
1219
1220 /* find a handler for it */
1221 handler_status = 0;
1222 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1223 be32_to_cpu(hdr->key));
1224 if (!nmh) {
1225 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1226 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1227 syserr = O2NET_ERR_NO_HNDLR;
1228 goto out_respond;
1229 }
1230
1231 syserr = O2NET_ERR_NONE;
1232
1233 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1234 syserr = O2NET_ERR_OVERFLOW;
1235
1236 if (syserr != O2NET_ERR_NONE)
1237 goto out_respond;
1238
Sunil Mushranff1becb2010-12-22 12:39:39 -08001239 o2net_set_func_start_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001240 sc->sc_msg_key = be32_to_cpu(hdr->key);
1241 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1242 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1243 be16_to_cpu(hdr->data_len),
Kurt Hackeld74c9802007-01-17 17:04:25 -08001244 nmh->nh_func_data, &ret_data);
Sunil Mushranff1becb2010-12-22 12:39:39 -08001245 o2net_set_func_stop_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001246
Sunil Mushrane4530392010-12-22 12:39:41 -08001247 o2net_update_recv_stats(sc);
1248
Zach Brown98211482005-12-15 14:31:23 -08001249out_respond:
1250 /* this destroys the hdr, so don't use it after this */
Zhen Wei925037b2007-01-23 17:19:59 -08001251 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001252 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1253 handler_status);
Zhen Wei925037b2007-01-23 17:19:59 -08001254 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001255 hdr = NULL;
1256 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1257 handler_status, syserr, ret);
1258
Kurt Hackeld74c9802007-01-17 17:04:25 -08001259 if (nmh) {
1260 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1261 if (nmh->nh_post_func)
1262 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1263 ret_data);
1264 }
1265
Zach Brown98211482005-12-15 14:31:23 -08001266out:
1267 if (nmh)
1268 o2net_handler_put(nmh);
1269 return ret;
1270}
1271
1272static int o2net_check_handshake(struct o2net_sock_container *sc)
1273{
1274 struct o2net_handshake *hand = page_address(sc->sc_page);
1275 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1276
1277 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001278 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net "
1279 "protocol version %llu but %llu is required. "
1280 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1281 (unsigned long long)be64_to_cpu(hand->protocol_version),
1282 O2NET_PROTOCOL_VERSION);
Zach Brown98211482005-12-15 14:31:23 -08001283
1284 /* don't bother reconnecting if its the wrong version. */
1285 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1286 return -1;
1287 }
1288
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001289 /*
1290 * Ensure timeouts are consistent with other nodes, otherwise
1291 * we can end up with one node thinking that the other must be down,
1292 * but isn't. This can ultimately cause corruption.
1293 */
1294 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
Jeff Mahoney409753b2008-03-28 16:44:13 -07001295 o2net_idle_timeout()) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001296 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network "
1297 "idle timeout of %u ms, but we use %u ms locally. "
1298 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1299 be32_to_cpu(hand->o2net_idle_timeout_ms),
1300 o2net_idle_timeout());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001301 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1302 return -1;
1303 }
1304
1305 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
Jeff Mahoney409753b2008-03-28 16:44:13 -07001306 o2net_keepalive_delay()) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001307 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive "
1308 "delay of %u ms, but we use %u ms locally. "
1309 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1310 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1311 o2net_keepalive_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001312 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1313 return -1;
1314 }
1315
1316 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1317 O2HB_MAX_WRITE_TIMEOUT_MS) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001318 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat "
1319 "timeout of %u ms, but we use %u ms locally. "
1320 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1321 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1322 O2HB_MAX_WRITE_TIMEOUT_MS);
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001323 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1324 return -1;
1325 }
1326
Zach Brown98211482005-12-15 14:31:23 -08001327 sc->sc_handshake_ok = 1;
1328
1329 spin_lock(&nn->nn_lock);
1330 /* set valid and queue the idle timers only if it hasn't been
1331 * shut down already */
1332 if (nn->nn_sc == sc) {
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001333 o2net_sc_reset_idle_timer(sc);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001334 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001335 o2net_set_nn_state(nn, sc, 1, 0);
1336 }
1337 spin_unlock(&nn->nn_lock);
1338
1339 /* shift everything up as though it wasn't there */
1340 sc->sc_page_off -= sizeof(struct o2net_handshake);
1341 if (sc->sc_page_off)
1342 memmove(hand, hand + 1, sc->sc_page_off);
1343
1344 return 0;
1345}
1346
1347/* this demuxes the queued rx bytes into header or payload bits and calls
1348 * handlers as each full message is read off the socket. it returns -error,
1349 * == 0 eof, or > 0 for progress made.*/
1350static int o2net_advance_rx(struct o2net_sock_container *sc)
1351{
1352 struct o2net_msg *hdr;
1353 int ret = 0;
1354 void *data;
1355 size_t datalen;
1356
1357 sclog(sc, "receiving\n");
Sunil Mushranff1becb2010-12-22 12:39:39 -08001358 o2net_set_advance_start_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001359
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001360 if (unlikely(sc->sc_handshake_ok == 0)) {
1361 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1362 data = page_address(sc->sc_page) + sc->sc_page_off;
1363 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1364 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1365 if (ret > 0)
1366 sc->sc_page_off += ret;
1367 }
1368
1369 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1370 o2net_check_handshake(sc);
1371 if (unlikely(sc->sc_handshake_ok == 0))
1372 ret = -EPROTO;
1373 }
1374 goto out;
1375 }
1376
Zach Brown98211482005-12-15 14:31:23 -08001377 /* do we need more header? */
1378 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1379 data = page_address(sc->sc_page) + sc->sc_page_off;
1380 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1381 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1382 if (ret > 0) {
1383 sc->sc_page_off += ret;
Zach Brown98211482005-12-15 14:31:23 -08001384 /* only swab incoming here.. we can
1385 * only get here once as we cross from
1386 * being under to over */
1387 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1388 hdr = page_address(sc->sc_page);
1389 if (be16_to_cpu(hdr->data_len) >
1390 O2NET_MAX_PAYLOAD_BYTES)
1391 ret = -EOVERFLOW;
1392 }
1393 }
1394 if (ret <= 0)
1395 goto out;
1396 }
1397
1398 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1399 /* oof, still don't have a header */
1400 goto out;
1401 }
1402
1403 /* this was swabbed above when we first read it */
1404 hdr = page_address(sc->sc_page);
1405
1406 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1407
1408 /* do we need more payload? */
1409 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1410 /* need more payload */
1411 data = page_address(sc->sc_page) + sc->sc_page_off;
1412 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1413 sc->sc_page_off;
1414 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1415 if (ret > 0)
1416 sc->sc_page_off += ret;
1417 if (ret <= 0)
1418 goto out;
1419 }
1420
1421 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1422 /* we can only get here once, the first time we read
1423 * the payload.. so set ret to progress if the handler
1424 * works out. after calling this the message is toast */
1425 ret = o2net_process_message(sc, hdr);
1426 if (ret == 0)
1427 ret = 1;
1428 sc->sc_page_off = 0;
1429 }
1430
1431out:
1432 sclog(sc, "ret = %d\n", ret);
Sunil Mushranff1becb2010-12-22 12:39:39 -08001433 o2net_set_advance_stop_time(sc);
Zach Brown98211482005-12-15 14:31:23 -08001434 return ret;
1435}
1436
1437/* this work func is triggerd by data ready. it reads until it can read no
1438 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1439 * our work the work struct will be marked and we'll be called again. */
David Howellsc4028952006-11-22 14:57:56 +00001440static void o2net_rx_until_empty(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001441{
David Howellsc4028952006-11-22 14:57:56 +00001442 struct o2net_sock_container *sc =
1443 container_of(work, struct o2net_sock_container, sc_rx_work);
Zach Brown98211482005-12-15 14:31:23 -08001444 int ret;
1445
1446 do {
1447 ret = o2net_advance_rx(sc);
1448 } while (ret > 0);
1449
1450 if (ret <= 0 && ret != -EAGAIN) {
1451 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1452 sclog(sc, "saw error %d, closing\n", ret);
1453 /* not permanent so read failed handshake can retry */
1454 o2net_ensure_shutdown(nn, sc, 0);
1455 }
1456
1457 sc_put(sc);
1458}
1459
1460static int o2net_set_nodelay(struct socket *sock)
1461{
1462 int ret, val = 1;
1463 mm_segment_t oldfs;
1464
1465 oldfs = get_fs();
1466 set_fs(KERNEL_DS);
1467
1468 /*
1469 * Dear unsuspecting programmer,
1470 *
1471 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1472 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1473 * silently turn into SO_DEBUG.
1474 *
1475 * Yours,
1476 * Keeper of hilariously fragile interfaces.
1477 */
1478 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1479 (char __user *)&val, sizeof(val));
1480
1481 set_fs(oldfs);
1482 return ret;
1483}
1484
Junxiao Bi8e9801d2014-08-29 15:19:02 -07001485static int o2net_set_usertimeout(struct socket *sock)
1486{
1487 int user_timeout = O2NET_TCP_USER_TIMEOUT;
1488
1489 return kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
1490 (char *)&user_timeout, sizeof(user_timeout));
1491}
1492
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001493static void o2net_initialize_handshake(void)
1494{
1495 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1496 O2HB_MAX_WRITE_TIMEOUT_MS);
Jeff Mahoney409753b2008-03-28 16:44:13 -07001497 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001498 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
Jeff Mahoney409753b2008-03-28 16:44:13 -07001499 o2net_keepalive_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001500 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
Jeff Mahoney409753b2008-03-28 16:44:13 -07001501 o2net_reconnect_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001502}
1503
Zach Brown98211482005-12-15 14:31:23 -08001504/* ------------------------------------------------------------ */
1505
1506/* called when a connect completes and after a sock is accepted. the
1507 * rx path will see the response and mark the sc valid */
David Howellsc4028952006-11-22 14:57:56 +00001508static void o2net_sc_connect_completed(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001509{
David Howellsc4028952006-11-22 14:57:56 +00001510 struct o2net_sock_container *sc =
1511 container_of(work, struct o2net_sock_container,
1512 sc_connect_work);
Zach Brown98211482005-12-15 14:31:23 -08001513
1514 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1515 (unsigned long long)O2NET_PROTOCOL_VERSION,
1516 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1517
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001518 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001519 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1520 sc_put(sc);
1521}
1522
1523/* this is called as a work_struct func. */
David Howellsc4028952006-11-22 14:57:56 +00001524static void o2net_sc_send_keep_req(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001525{
David Howellsc4028952006-11-22 14:57:56 +00001526 struct o2net_sock_container *sc =
1527 container_of(work, struct o2net_sock_container,
1528 sc_keepalive_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001529
1530 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1531 sc_put(sc);
1532}
1533
1534/* socket shutdown does a del_timer_sync against this as it tears down.
1535 * we can't start this timer until we've got to the point in sc buildup
1536 * where shutdown is going to be involved */
1537static void o2net_idle_timer(unsigned long data)
1538{
1539 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
Tao Ma5cc3bf22008-03-05 15:50:12 +08001540 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
Sunil Mushranff1becb2010-12-22 12:39:39 -08001541#ifdef CONFIG_DEBUG_FS
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001542 unsigned long msecs = ktime_to_ms(ktime_get()) -
1543 ktime_to_ms(sc->sc_tv_timer);
1544#else
1545 unsigned long msecs = o2net_idle_timeout();
Sunil Mushranff1becb2010-12-22 12:39:39 -08001546#endif
Zach Brown98211482005-12-15 14:31:23 -08001547
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001548 printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been "
Junxiao Bic43c3632014-08-29 15:19:00 -07001549 "idle for %lu.%lu secs.\n",
1550 SC_NODEF_ARGS(sc), msecs / 1000, msecs % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001551
Junxiao Bic43c3632014-08-29 15:19:00 -07001552 /* idle timerout happen, don't shutdown the connection, but
1553 * make fence decision. Maybe the connection can recover before
1554 * the decision is made.
Tao Ma5cc3bf22008-03-05 15:50:12 +08001555 */
1556 atomic_set(&nn->nn_timeout, 1);
Junxiao Bic43c3632014-08-29 15:19:00 -07001557 o2quo_conn_err(o2net_num_from_nn(nn));
1558 queue_delayed_work(o2net_wq, &nn->nn_still_up,
1559 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
Tao Ma5cc3bf22008-03-05 15:50:12 +08001560
Junxiao Bic43c3632014-08-29 15:19:00 -07001561 o2net_sc_reset_idle_timer(sc);
1562
Zach Brown98211482005-12-15 14:31:23 -08001563}
1564
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001565static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
Zach Brown98211482005-12-15 14:31:23 -08001566{
1567 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1568 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
Jeff Mahoney409753b2008-03-28 16:44:13 -07001569 msecs_to_jiffies(o2net_keepalive_delay()));
Sunil Mushranff1becb2010-12-22 12:39:39 -08001570 o2net_set_sock_timer(sc);
Zach Brown98211482005-12-15 14:31:23 -08001571 mod_timer(&sc->sc_idle_timeout,
Jeff Mahoney409753b2008-03-28 16:44:13 -07001572 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001573}
1574
1575static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1576{
Junxiao Bic43c3632014-08-29 15:19:00 -07001577 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1578
1579 /* clear fence decision since the connection recover from timeout*/
1580 if (atomic_read(&nn->nn_timeout)) {
1581 o2quo_conn_up(o2net_num_from_nn(nn));
1582 cancel_delayed_work(&nn->nn_still_up);
1583 atomic_set(&nn->nn_timeout, 0);
1584 }
1585
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001586 /* 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;
Xue jiufeib246d3d2014-10-09 15:28:26 -07001606 unsigned int noio_flag;
Zach Brown98211482005-12-15 14:31:23 -08001607
Xue jiufeib246d3d2014-10-09 15:28:26 -07001608 /*
1609 * sock_create allocates the sock with GFP_KERNEL. We must set
1610 * per-process flag PF_MEMALLOC_NOIO so that all allocations done
1611 * by this process are done as if GFP_NOIO was specified. So we
1612 * are not reentering filesystem while doing memory reclaim.
1613 */
1614 noio_flag = memalloc_noio_save();
Zach Brown98211482005-12-15 14:31:23 -08001615 /* if we're greater we initiate tx, otherwise we accept */
1616 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1617 goto out;
1618
1619 /* watch for racing with tearing a node down */
1620 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
piaojun7d65b272016-07-26 15:21:47 -07001621 if (node == NULL)
Zach Brown98211482005-12-15 14:31:23 -08001622 goto out;
Zach Brown98211482005-12-15 14:31:23 -08001623
Sunil Mushranb7668c72006-02-28 23:28:01 -08001624 mynode = o2nm_get_node_by_num(o2nm_this_node());
piaojun7d65b272016-07-26 15:21:47 -07001625 if (mynode == NULL)
Sunil Mushranb7668c72006-02-28 23:28:01 -08001626 goto out;
Sunil Mushranb7668c72006-02-28 23:28:01 -08001627
Zach Brown98211482005-12-15 14:31:23 -08001628 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001629 /*
1630 * see if we already have one pending or have given up.
1631 * For nn_timeout, it is set when we close the connection
1632 * because of the idle time out. So it means that we have
1633 * at least connected to that node successfully once,
1634 * now try to connect to it again.
1635 */
1636 timeout = atomic_read(&nn->nn_timeout);
1637 stop = (nn->nn_sc ||
1638 (nn->nn_persistent_error &&
1639 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
Zach Brown98211482005-12-15 14:31:23 -08001640 spin_unlock(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00001641 if (stop)
Zach Brown98211482005-12-15 14:31:23 -08001642 goto out;
1643
1644 nn->nn_last_connect_attempt = jiffies;
1645
1646 sc = sc_alloc(node);
1647 if (sc == NULL) {
1648 mlog(0, "couldn't allocate sc\n");
1649 ret = -ENOMEM;
1650 goto out;
1651 }
1652
1653 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1654 if (ret < 0) {
1655 mlog(0, "can't create socket: %d\n", ret);
1656 goto out;
1657 }
1658 sc->sc_sock = sock; /* freed by sc_kref_release */
1659
1660 sock->sk->sk_allocation = GFP_ATOMIC;
1661
1662 myaddr.sin_family = AF_INET;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001663 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
Al Viro97bd7912007-12-05 08:46:47 +00001664 myaddr.sin_port = htons(0); /* any port */
Zach Brown98211482005-12-15 14:31:23 -08001665
1666 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1667 sizeof(myaddr));
1668 if (ret) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001669 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1670 ret, &mynode->nd_ipv4_address);
Zach Brown98211482005-12-15 14:31:23 -08001671 goto out;
1672 }
1673
1674 ret = o2net_set_nodelay(sc->sc_sock);
1675 if (ret) {
1676 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1677 goto out;
1678 }
1679
Junxiao Bi8e9801d2014-08-29 15:19:02 -07001680 ret = o2net_set_usertimeout(sock);
1681 if (ret) {
1682 mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret);
1683 goto out;
1684 }
1685
Zach Brown98211482005-12-15 14:31:23 -08001686 o2net_register_callbacks(sc->sc_sock->sk, sc);
1687
1688 spin_lock(&nn->nn_lock);
1689 /* handshake completion will set nn->nn_sc_valid */
1690 o2net_set_nn_state(nn, sc, 0, 0);
1691 spin_unlock(&nn->nn_lock);
1692
1693 remoteaddr.sin_family = AF_INET;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001694 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1695 remoteaddr.sin_port = node->nd_ipv4_port;
Zach Brown98211482005-12-15 14:31:23 -08001696
1697 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1698 (struct sockaddr *)&remoteaddr,
1699 sizeof(remoteaddr),
1700 O_NONBLOCK);
1701 if (ret == -EINPROGRESS)
1702 ret = 0;
1703
1704out:
Sunil Mushran8dd79032013-09-11 14:19:49 -07001705 if (ret && sc) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001706 printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT
1707 " failed with errno %d\n", SC_NODEF_ARGS(sc), ret);
Zach Brown98211482005-12-15 14:31:23 -08001708 /* 0 err so that another will be queued and attempted
1709 * from set_nn_state */
Sunil Mushran8dd79032013-09-11 14:19:49 -07001710 o2net_ensure_shutdown(nn, sc, 0);
Zach Brown98211482005-12-15 14:31:23 -08001711 }
1712 if (sc)
1713 sc_put(sc);
1714 if (node)
1715 o2nm_node_put(node);
Sunil Mushranb7668c72006-02-28 23:28:01 -08001716 if (mynode)
1717 o2nm_node_put(mynode);
Zach Brown98211482005-12-15 14:31:23 -08001718
Xue jiufeib246d3d2014-10-09 15:28:26 -07001719 memalloc_noio_restore(noio_flag);
Zach Brown98211482005-12-15 14:31:23 -08001720 return;
1721}
1722
David Howellsc4028952006-11-22 14:57:56 +00001723static void o2net_connect_expired(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001724{
David Howellsc4028952006-11-22 14:57:56 +00001725 struct o2net_node *nn =
1726 container_of(work, struct o2net_node, nn_connect_expired.work);
Zach Brown98211482005-12-15 14:31:23 -08001727
1728 spin_lock(&nn->nn_lock);
1729 if (!nn->nn_sc_valid) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001730 printk(KERN_NOTICE "o2net: No connection established with "
Junxiao Bi5046f182014-10-09 15:25:11 -07001731 "node %u after %u.%u seconds, check network and"
1732 " cluster configuration.\n",
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001733 o2net_num_from_nn(nn),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001734 o2net_idle_timeout() / 1000,
1735 o2net_idle_timeout() % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001736
Junxiao Bi196fe712014-12-10 15:41:51 -08001737 o2net_set_nn_state(nn, NULL, 0, 0);
Zach Brown98211482005-12-15 14:31:23 -08001738 }
1739 spin_unlock(&nn->nn_lock);
1740}
1741
David Howellsc4028952006-11-22 14:57:56 +00001742static void o2net_still_up(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001743{
David Howellsc4028952006-11-22 14:57:56 +00001744 struct o2net_node *nn =
1745 container_of(work, struct o2net_node, nn_still_up.work);
Zach Brown98211482005-12-15 14:31:23 -08001746
1747 o2quo_hb_still_up(o2net_num_from_nn(nn));
1748}
1749
1750/* ------------------------------------------------------------ */
1751
1752void o2net_disconnect_node(struct o2nm_node *node)
1753{
1754 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1755
1756 /* don't reconnect until it's heartbeating again */
1757 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001758 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001759 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1760 spin_unlock(&nn->nn_lock);
1761
1762 if (o2net_wq) {
1763 cancel_delayed_work(&nn->nn_connect_expired);
1764 cancel_delayed_work(&nn->nn_connect_work);
1765 cancel_delayed_work(&nn->nn_still_up);
1766 flush_workqueue(o2net_wq);
1767 }
1768}
1769
1770static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1771 void *data)
1772{
1773 o2quo_hb_down(node_num);
1774
Sunil Mushran0e105d32010-10-07 17:00:16 -07001775 if (!node)
1776 return;
1777
Zach Brown98211482005-12-15 14:31:23 -08001778 if (node_num != o2nm_this_node())
1779 o2net_disconnect_node(node);
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001780
1781 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
Zach Brown98211482005-12-15 14:31:23 -08001782}
1783
1784static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1785 void *data)
1786{
1787 struct o2net_node *nn = o2net_nn_from_num(node_num);
1788
1789 o2quo_hb_up(node_num);
1790
Sunil Mushran0e105d32010-10-07 17:00:16 -07001791 BUG_ON(!node);
1792
Zach Brown98211482005-12-15 14:31:23 -08001793 /* ensure an immediate connect attempt */
1794 nn->nn_last_connect_attempt = jiffies -
Jeff Mahoney409753b2008-03-28 16:44:13 -07001795 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
Zach Brown98211482005-12-15 14:31:23 -08001796
1797 if (node_num != o2nm_this_node()) {
Zach Brown98211482005-12-15 14:31:23 -08001798 /* believe it or not, accept and node hearbeating testing
1799 * can succeed for this node before we got here.. so
1800 * only use set_nn_state to clear the persistent error
1801 * if that hasn't already happened */
1802 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001803 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001804 if (nn->nn_persistent_error)
1805 o2net_set_nn_state(nn, NULL, 0, 0);
1806 spin_unlock(&nn->nn_lock);
1807 }
1808}
1809
1810void o2net_unregister_hb_callbacks(void)
1811{
Joel Becker14829422007-06-14 21:40:49 -07001812 o2hb_unregister_callback(NULL, &o2net_hb_up);
1813 o2hb_unregister_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001814}
1815
1816int o2net_register_hb_callbacks(void)
1817{
1818 int ret;
1819
1820 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1821 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1822 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1823 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1824
Joel Becker14829422007-06-14 21:40:49 -07001825 ret = o2hb_register_callback(NULL, &o2net_hb_up);
Zach Brown98211482005-12-15 14:31:23 -08001826 if (ret == 0)
Joel Becker14829422007-06-14 21:40:49 -07001827 ret = o2hb_register_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001828
1829 if (ret)
1830 o2net_unregister_hb_callbacks();
1831
1832 return ret;
1833}
1834
1835/* ------------------------------------------------------------ */
1836
Tariq Saeed79deb3c2014-06-10 15:18:38 -07001837static int o2net_accept_one(struct socket *sock, int *more)
Zach Brown98211482005-12-15 14:31:23 -08001838{
1839 int ret, slen;
1840 struct sockaddr_in sin;
1841 struct socket *new_sock = NULL;
1842 struct o2nm_node *node = NULL;
Tristan Ye415cf322010-08-02 10:00:26 +08001843 struct o2nm_node *local_node = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001844 struct o2net_sock_container *sc = NULL;
1845 struct o2net_node *nn;
Xue jiufeib246d3d2014-10-09 15:28:26 -07001846 unsigned int noio_flag;
1847
1848 /*
1849 * sock_create_lite allocates the sock with GFP_KERNEL. We must set
1850 * per-process flag PF_MEMALLOC_NOIO so that all allocations done
1851 * by this process are done as if GFP_NOIO was specified. So we
1852 * are not reentering filesystem while doing memory reclaim.
1853 */
1854 noio_flag = memalloc_noio_save();
Zach Brown98211482005-12-15 14:31:23 -08001855
1856 BUG_ON(sock == NULL);
Tariq Saeed79deb3c2014-06-10 15:18:38 -07001857 *more = 0;
Zach Brown98211482005-12-15 14:31:23 -08001858 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1859 sock->sk->sk_protocol, &new_sock);
1860 if (ret)
1861 goto out;
1862
1863 new_sock->type = sock->type;
1864 new_sock->ops = sock->ops;
1865 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1866 if (ret < 0)
1867 goto out;
1868
Tariq Saeed79deb3c2014-06-10 15:18:38 -07001869 *more = 1;
Zach Brown98211482005-12-15 14:31:23 -08001870 new_sock->sk->sk_allocation = GFP_ATOMIC;
1871
1872 ret = o2net_set_nodelay(new_sock);
1873 if (ret) {
1874 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1875 goto out;
1876 }
1877
Junxiao Bi8e9801d2014-08-29 15:19:02 -07001878 ret = o2net_set_usertimeout(new_sock);
1879 if (ret) {
1880 mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret);
1881 goto out;
1882 }
1883
Zach Brown98211482005-12-15 14:31:23 -08001884 slen = sizeof(sin);
1885 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1886 &slen, 1);
1887 if (ret < 0)
1888 goto out;
1889
Al Viro97bd7912007-12-05 08:46:47 +00001890 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
Zach Brown98211482005-12-15 14:31:23 -08001891 if (node == NULL) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001892 printk(KERN_NOTICE "o2net: Attempt to connect from unknown "
1893 "node at %pI4:%d\n", &sin.sin_addr.s_addr,
1894 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001895 ret = -EINVAL;
1896 goto out;
1897 }
1898
Tristan Ye415cf322010-08-02 10:00:26 +08001899 if (o2nm_this_node() >= node->nd_num) {
1900 local_node = o2nm_get_node_by_num(o2nm_this_node());
Joseph Qi03dbe882013-09-11 14:20:01 -07001901 if (local_node)
1902 printk(KERN_NOTICE "o2net: Unexpected connect attempt "
1903 "seen at node '%s' (%u, %pI4:%d) from "
1904 "node '%s' (%u, %pI4:%d)\n",
1905 local_node->nd_name, local_node->nd_num,
1906 &(local_node->nd_ipv4_address),
1907 ntohs(local_node->nd_ipv4_port),
1908 node->nd_name,
1909 node->nd_num, &sin.sin_addr.s_addr,
1910 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001911 ret = -EINVAL;
1912 goto out;
1913 }
1914
1915 /* this happens all the time when the other node sees our heartbeat
1916 * and tries to connect before we see their heartbeat */
1917 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1918 mlog(ML_CONN, "attempt to connect from node '%s' at "
Harvey Harrisonbe859402008-10-31 00:56:28 -07001919 "%pI4:%d but it isn't heartbeating\n",
1920 node->nd_name, &sin.sin_addr.s_addr,
Al Viro97bd7912007-12-05 08:46:47 +00001921 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001922 ret = -EINVAL;
1923 goto out;
1924 }
1925
1926 nn = o2net_nn_from_num(node->nd_num);
1927
1928 spin_lock(&nn->nn_lock);
1929 if (nn->nn_sc)
1930 ret = -EBUSY;
1931 else
1932 ret = 0;
1933 spin_unlock(&nn->nn_lock);
1934 if (ret) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07001935 printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' "
1936 "at %pI4:%d but it already has an open connection\n",
1937 node->nd_name, &sin.sin_addr.s_addr,
1938 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001939 goto out;
1940 }
1941
1942 sc = sc_alloc(node);
1943 if (sc == NULL) {
1944 ret = -ENOMEM;
1945 goto out;
1946 }
1947
1948 sc->sc_sock = new_sock;
1949 new_sock = NULL;
1950
1951 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001952 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001953 o2net_set_nn_state(nn, sc, 0, 0);
1954 spin_unlock(&nn->nn_lock);
1955
1956 o2net_register_callbacks(sc->sc_sock->sk, sc);
1957 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1958
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001959 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001960 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1961
1962out:
1963 if (new_sock)
1964 sock_release(new_sock);
1965 if (node)
1966 o2nm_node_put(node);
Tristan Ye415cf322010-08-02 10:00:26 +08001967 if (local_node)
1968 o2nm_node_put(local_node);
Zach Brown98211482005-12-15 14:31:23 -08001969 if (sc)
1970 sc_put(sc);
Xue jiufeib246d3d2014-10-09 15:28:26 -07001971
1972 memalloc_noio_restore(noio_flag);
Zach Brown98211482005-12-15 14:31:23 -08001973 return ret;
1974}
1975
Tariq Saeed79deb3c2014-06-10 15:18:38 -07001976/*
1977 * This function is invoked in response to one or more
1978 * pending accepts at softIRQ level. We must drain the
1979 * entire que before returning.
1980 */
1981
David Howellsc4028952006-11-22 14:57:56 +00001982static void o2net_accept_many(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001983{
David Howellsc4028952006-11-22 14:57:56 +00001984 struct socket *sock = o2net_listen_sock;
Tariq Saeed79deb3c2014-06-10 15:18:38 -07001985 int more;
1986 int err;
1987
1988 /*
1989 * It is critical to note that due to interrupt moderation
1990 * at the network driver level, we can't assume to get a
1991 * softIRQ for every single conn since tcp SYN packets
1992 * can arrive back-to-back, and therefore many pending
1993 * accepts may result in just 1 softIRQ. If we terminate
1994 * the o2net_accept_one() loop upon seeing an err, what happens
1995 * to the rest of the conns in the queue? If no new SYN
1996 * arrives for hours, no softIRQ will be delivered,
1997 * and the connections will just sit in the queue.
1998 */
1999
2000 for (;;) {
2001 err = o2net_accept_one(sock, &more);
2002 if (!more)
2003 break;
Zach Brown98211482005-12-15 14:31:23 -08002004 cond_resched();
Tariq Saeed79deb3c2014-06-10 15:18:38 -07002005 }
Zach Brown98211482005-12-15 14:31:23 -08002006}
2007
David S. Miller676d2362014-04-11 16:15:36 -04002008static void o2net_listen_data_ready(struct sock *sk)
Zach Brown98211482005-12-15 14:31:23 -08002009{
David S. Miller676d2362014-04-11 16:15:36 -04002010 void (*ready)(struct sock *sk);
Zach Brown98211482005-12-15 14:31:23 -08002011
Eric Dumazete1daca22016-05-17 17:44:07 -07002012 read_lock_bh(&sk->sk_callback_lock);
Zach Brown98211482005-12-15 14:31:23 -08002013 ready = sk->sk_user_data;
2014 if (ready == NULL) { /* check for teardown race */
2015 ready = sk->sk_data_ready;
2016 goto out;
2017 }
2018
Tariq Saeedda8ded42014-04-03 14:47:11 -07002019 /* This callback may called twice when a new connection
2020 * is being established as a child socket inherits everything
2021 * from a parent LISTEN socket, including the data_ready cb of
2022 * the parent. This leads to a hazard. In o2net_accept_one()
2023 * we are still initializing the child socket but have not
2024 * changed the inherited data_ready callback yet when
2025 * data starts arriving.
2026 * We avoid this hazard by checking the state.
2027 * For the listening socket, the state will be TCP_LISTEN; for the new
2028 * socket, will be TCP_ESTABLISHED. Also, in this case,
2029 * sk->sk_user_data is not a valid function pointer.
2030 */
2031
Zach Brown98211482005-12-15 14:31:23 -08002032 if (sk->sk_state == TCP_LISTEN) {
Zach Brown98211482005-12-15 14:31:23 -08002033 queue_work(o2net_wq, &o2net_listen_work);
Tariq Saeedda8ded42014-04-03 14:47:11 -07002034 } else {
2035 ready = NULL;
Zach Brown98211482005-12-15 14:31:23 -08002036 }
2037
2038out:
Eric Dumazete1daca22016-05-17 17:44:07 -07002039 read_unlock_bh(&sk->sk_callback_lock);
Tariq Saeedda8ded42014-04-03 14:47:11 -07002040 if (ready != NULL)
David S. Miller676d2362014-04-11 16:15:36 -04002041 ready(sk);
Zach Brown98211482005-12-15 14:31:23 -08002042}
2043
Sunil Mushranab81afd2007-01-29 14:57:14 -08002044static int o2net_open_listening_sock(__be32 addr, __be16 port)
Zach Brown98211482005-12-15 14:31:23 -08002045{
2046 struct socket *sock = NULL;
2047 int ret;
2048 struct sockaddr_in sin = {
2049 .sin_family = PF_INET,
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07002050 .sin_addr = { .s_addr = addr },
2051 .sin_port = port,
Zach Brown98211482005-12-15 14:31:23 -08002052 };
2053
2054 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
2055 if (ret < 0) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07002056 printk(KERN_ERR "o2net: Error %d while creating socket\n", ret);
Zach Brown98211482005-12-15 14:31:23 -08002057 goto out;
2058 }
2059
2060 sock->sk->sk_allocation = GFP_ATOMIC;
2061
2062 write_lock_bh(&sock->sk->sk_callback_lock);
2063 sock->sk->sk_user_data = sock->sk->sk_data_ready;
2064 sock->sk->sk_data_ready = o2net_listen_data_ready;
2065 write_unlock_bh(&sock->sk->sk_callback_lock);
2066
2067 o2net_listen_sock = sock;
David Howellsc4028952006-11-22 14:57:56 +00002068 INIT_WORK(&o2net_listen_work, o2net_accept_many);
Zach Brown98211482005-12-15 14:31:23 -08002069
Pavel Emelyanov4a17fd52012-04-19 03:39:36 +00002070 sock->sk->sk_reuse = SK_CAN_REUSE;
Zach Brown98211482005-12-15 14:31:23 -08002071 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
2072 if (ret < 0) {
Sunil Mushran1dfecf82011-07-24 10:22:54 -07002073 printk(KERN_ERR "o2net: Error %d while binding socket at "
2074 "%pI4:%u\n", ret, &addr, ntohs(port));
Zach Brown98211482005-12-15 14:31:23 -08002075 goto out;
2076 }
2077
2078 ret = sock->ops->listen(sock, 64);
Sunil Mushran1dfecf82011-07-24 10:22:54 -07002079 if (ret < 0)
2080 printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n",
2081 ret, &addr, ntohs(port));
Zach Brown98211482005-12-15 14:31:23 -08002082
2083out:
2084 if (ret) {
2085 o2net_listen_sock = NULL;
2086 if (sock)
2087 sock_release(sock);
2088 }
2089 return ret;
2090}
2091
2092/*
2093 * called from node manager when we should bring up our network listening
2094 * socket. node manager handles all the serialization to only call this
2095 * once and to match it with o2net_stop_listening(). note,
2096 * o2nm_this_node() doesn't work yet as we're being called while it
2097 * is being set up.
2098 */
2099int o2net_start_listening(struct o2nm_node *node)
2100{
2101 int ret = 0;
2102
2103 BUG_ON(o2net_wq != NULL);
2104 BUG_ON(o2net_listen_sock != NULL);
2105
2106 mlog(ML_KTHREAD, "starting o2net thread...\n");
Bhaktipriya Shridharbf940772016-10-07 16:57:10 -07002107 o2net_wq = alloc_ordered_workqueue("o2net", WQ_MEM_RECLAIM);
Zach Brown98211482005-12-15 14:31:23 -08002108 if (o2net_wq == NULL) {
2109 mlog(ML_ERROR, "unable to launch o2net thread\n");
2110 return -ENOMEM; /* ? */
2111 }
2112
Sunil Mushranab81afd2007-01-29 14:57:14 -08002113 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2114 node->nd_ipv4_port);
Zach Brown98211482005-12-15 14:31:23 -08002115 if (ret) {
2116 destroy_workqueue(o2net_wq);
2117 o2net_wq = NULL;
2118 } else
2119 o2quo_conn_up(node->nd_num);
2120
2121 return ret;
2122}
2123
2124/* again, o2nm_this_node() doesn't work here as we're involved in
2125 * tearing it down */
2126void o2net_stop_listening(struct o2nm_node *node)
2127{
2128 struct socket *sock = o2net_listen_sock;
2129 size_t i;
2130
2131 BUG_ON(o2net_wq == NULL);
2132 BUG_ON(o2net_listen_sock == NULL);
2133
2134 /* stop the listening socket from generating work */
2135 write_lock_bh(&sock->sk->sk_callback_lock);
2136 sock->sk->sk_data_ready = sock->sk->sk_user_data;
2137 sock->sk->sk_user_data = NULL;
2138 write_unlock_bh(&sock->sk->sk_callback_lock);
2139
2140 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2141 struct o2nm_node *node = o2nm_get_node_by_num(i);
2142 if (node) {
2143 o2net_disconnect_node(node);
2144 o2nm_node_put(node);
2145 }
2146 }
2147
2148 /* finish all work and tear down the work queue */
2149 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2150 destroy_workqueue(o2net_wq);
2151 o2net_wq = NULL;
2152
2153 sock_release(o2net_listen_sock);
2154 o2net_listen_sock = NULL;
2155
2156 o2quo_conn_err(node->nd_num);
2157}
2158
2159/* ------------------------------------------------------------ */
2160
2161int o2net_init(void)
2162{
2163 unsigned long i;
2164
2165 o2quo_init();
2166
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002167 if (o2net_debugfs_init())
Joseph Qi4a4e07c2014-10-09 15:24:58 -07002168 goto out;
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002169
Robert P. J. Daycd861282006-12-13 00:34:52 -08002170 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2171 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2172 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
Joseph Qi4a4e07c2014-10-09 15:24:58 -07002173 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp)
2174 goto out;
Zach Brown98211482005-12-15 14:31:23 -08002175
2176 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2177 o2net_hand->connector_id = cpu_to_be64(1);
2178
2179 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2180 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2181
2182 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2183 struct o2net_node *nn = o2net_nn_from_num(i);
2184
Tao Ma5cc3bf22008-03-05 15:50:12 +08002185 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08002186 spin_lock_init(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00002187 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2188 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2189 o2net_connect_expired);
2190 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
Zach Brown98211482005-12-15 14:31:23 -08002191 /* until we see hb from a node we'll return einval */
2192 nn->nn_persistent_error = -ENOTCONN;
2193 init_waitqueue_head(&nn->nn_sc_wq);
2194 idr_init(&nn->nn_status_idr);
2195 INIT_LIST_HEAD(&nn->nn_status_list);
2196 }
2197
2198 return 0;
Joseph Qi4a4e07c2014-10-09 15:24:58 -07002199
2200out:
2201 kfree(o2net_hand);
2202 kfree(o2net_keep_req);
2203 kfree(o2net_keep_resp);
alex chenfce56d82015-06-24 16:55:18 -07002204 o2net_debugfs_exit();
Joseph Qi4a4e07c2014-10-09 15:24:58 -07002205 o2quo_exit();
2206 return -ENOMEM;
Zach Brown98211482005-12-15 14:31:23 -08002207}
2208
2209void o2net_exit(void)
2210{
2211 o2quo_exit();
2212 kfree(o2net_hand);
2213 kfree(o2net_keep_req);
2214 kfree(o2net_keep_resp);
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002215 o2net_debugfs_exit();
Zach Brown98211482005-12-15 14:31:23 -08002216}