blob: 334f231a422c732db5a9364596f9d9655f5dee79 [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
Zach Brown98211482005-12-15 14:31:23 -080075#define SC_NODEF_FMT "node %s (num %u) at %u.%u.%u.%u:%u"
76#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
77 NIPQUAD(sc->sc_node->nd_ipv4_address), \
78 ntohs(sc->sc_node->nd_ipv4_port)
79
80/*
81 * In the following two log macros, the whitespace after the ',' just
82 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
83 * previous token if args expands to nothing.
84 */
85#define msglog(hdr, fmt, args...) do { \
86 typeof(hdr) __hdr = (hdr); \
87 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
88 "key %08x num %u] " fmt, \
89 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
90 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
91 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
92 be32_to_cpu(__hdr->msg_num) , ##args); \
93} while (0)
94
95#define sclog(sc, fmt, args...) do { \
96 typeof(sc) __sc = (sc); \
97 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
98 "pg_off %zu] " fmt, __sc, \
99 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
100 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
101 ##args); \
102} while (0)
103
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
Adrian Bunk18496e82008-08-07 00:11:12 +0300156static void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700157{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700158 do_gettimeofday(&nst->st_sock_time);
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700159}
160
Adrian Bunk18496e82008-08-07 00:11:12 +0300161static void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700162{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700163 do_gettimeofday(&nst->st_send_time);
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700164}
165
Adrian Bunk18496e82008-08-07 00:11:12 +0300166static void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700167{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700168 do_gettimeofday(&nst->st_status_time);
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700169}
170
Adrian Bunk18496e82008-08-07 00:11:12 +0300171static void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700172 struct o2net_sock_container *sc)
173{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700174 nst->st_sc = sc;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700175}
176
Adrian Bunk18496e82008-08-07 00:11:12 +0300177static void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, u32 msg_id)
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700178{
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700179 nst->st_id = msg_id;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700180}
Adrian Bunk18496e82008-08-07 00:11:12 +0300181
182#else /* CONFIG_DEBUG_FS */
183
184static inline void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
185 u32 msgkey, struct task_struct *task, u8 node)
186{
187}
188
189static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
190{
191}
192
193static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
194{
195}
196
197static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
198{
199}
200
201static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
202 struct o2net_sock_container *sc)
203{
204}
205
206static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
207 u32 msg_id)
208{
209}
210
Sunil Mushran0f475b22008-05-12 18:31:37 -0700211#endif /* CONFIG_DEBUG_FS */
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700212
Jeff Mahoney409753b2008-03-28 16:44:13 -0700213static inline int o2net_reconnect_delay(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100214{
215 return o2nm_single_cluster->cl_reconnect_delay_ms;
216}
217
Jeff Mahoney409753b2008-03-28 16:44:13 -0700218static inline int o2net_keepalive_delay(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100219{
220 return o2nm_single_cluster->cl_keepalive_delay_ms;
221}
222
Jeff Mahoney409753b2008-03-28 16:44:13 -0700223static inline int o2net_idle_timeout(void)
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100224{
225 return o2nm_single_cluster->cl_idle_timeout_ms;
226}
Zach Brown98211482005-12-15 14:31:23 -0800227
228static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
229{
230 int trans;
231 BUG_ON(err >= O2NET_ERR_MAX);
232 trans = o2net_sys_err_translations[err];
233
234 /* Just in case we mess up the translation table above */
235 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
236 return trans;
237}
238
239static struct o2net_node * o2net_nn_from_num(u8 node_num)
240{
241 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
242 return &o2net_nodes[node_num];
243}
244
245static u8 o2net_num_from_nn(struct o2net_node *nn)
246{
247 BUG_ON(nn == NULL);
248 return nn - o2net_nodes;
249}
250
251/* ------------------------------------------------------------ */
252
253static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
254{
255 int ret = 0;
256
257 do {
258 if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) {
259 ret = -EAGAIN;
260 break;
261 }
262 spin_lock(&nn->nn_lock);
263 ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id);
264 if (ret == 0)
265 list_add_tail(&nsw->ns_node_item,
266 &nn->nn_status_list);
267 spin_unlock(&nn->nn_lock);
268 } while (ret == -EAGAIN);
269
270 if (ret == 0) {
271 init_waitqueue_head(&nsw->ns_wq);
272 nsw->ns_sys_status = O2NET_ERR_NONE;
273 nsw->ns_status = 0;
274 }
275
276 return ret;
277}
278
279static void o2net_complete_nsw_locked(struct o2net_node *nn,
280 struct o2net_status_wait *nsw,
281 enum o2net_system_error sys_status,
282 s32 status)
283{
284 assert_spin_locked(&nn->nn_lock);
285
286 if (!list_empty(&nsw->ns_node_item)) {
287 list_del_init(&nsw->ns_node_item);
288 nsw->ns_sys_status = sys_status;
289 nsw->ns_status = status;
290 idr_remove(&nn->nn_status_idr, nsw->ns_id);
291 wake_up(&nsw->ns_wq);
292 }
293}
294
295static void o2net_complete_nsw(struct o2net_node *nn,
296 struct o2net_status_wait *nsw,
297 u64 id, enum o2net_system_error sys_status,
298 s32 status)
299{
300 spin_lock(&nn->nn_lock);
301 if (nsw == NULL) {
302 if (id > INT_MAX)
303 goto out;
304
305 nsw = idr_find(&nn->nn_status_idr, id);
306 if (nsw == NULL)
307 goto out;
308 }
309
310 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
311
312out:
313 spin_unlock(&nn->nn_lock);
314 return;
315}
316
317static void o2net_complete_nodes_nsw(struct o2net_node *nn)
318{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200319 struct o2net_status_wait *nsw, *tmp;
Zach Brown98211482005-12-15 14:31:23 -0800320 unsigned int num_kills = 0;
Zach Brown98211482005-12-15 14:31:23 -0800321
322 assert_spin_locked(&nn->nn_lock);
323
Christoph Hellwig800deef2007-05-17 16:03:13 +0200324 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
Zach Brown98211482005-12-15 14:31:23 -0800325 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
326 num_kills++;
327 }
328
329 mlog(0, "completed %d messages for node %u\n", num_kills,
330 o2net_num_from_nn(nn));
331}
332
333static int o2net_nsw_completed(struct o2net_node *nn,
334 struct o2net_status_wait *nsw)
335{
336 int completed;
337 spin_lock(&nn->nn_lock);
338 completed = list_empty(&nsw->ns_node_item);
339 spin_unlock(&nn->nn_lock);
340 return completed;
341}
342
343/* ------------------------------------------------------------ */
344
345static void sc_kref_release(struct kref *kref)
346{
347 struct o2net_sock_container *sc = container_of(kref,
348 struct o2net_sock_container, sc_kref);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100349 BUG_ON(timer_pending(&sc->sc_idle_timeout));
350
Zach Brown98211482005-12-15 14:31:23 -0800351 sclog(sc, "releasing\n");
352
353 if (sc->sc_sock) {
354 sock_release(sc->sc_sock);
355 sc->sc_sock = NULL;
356 }
357
358 o2nm_node_put(sc->sc_node);
359 sc->sc_node = NULL;
360
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700361 o2net_debug_del_sc(sc);
Zach Brown98211482005-12-15 14:31:23 -0800362 kfree(sc);
363}
364
365static void sc_put(struct o2net_sock_container *sc)
366{
367 sclog(sc, "put\n");
368 kref_put(&sc->sc_kref, sc_kref_release);
369}
370static void sc_get(struct o2net_sock_container *sc)
371{
372 sclog(sc, "get\n");
373 kref_get(&sc->sc_kref);
374}
375static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
376{
377 struct o2net_sock_container *sc, *ret = NULL;
378 struct page *page = NULL;
379
380 page = alloc_page(GFP_NOFS);
Robert P. J. Daycd861282006-12-13 00:34:52 -0800381 sc = kzalloc(sizeof(*sc), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800382 if (sc == NULL || page == NULL)
383 goto out;
384
385 kref_init(&sc->sc_kref);
386 o2nm_node_get(node);
387 sc->sc_node = node;
388
David Howellsc4028952006-11-22 14:57:56 +0000389 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
390 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
391 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
392 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
Zach Brown98211482005-12-15 14:31:23 -0800393
394 init_timer(&sc->sc_idle_timeout);
395 sc->sc_idle_timeout.function = o2net_idle_timer;
396 sc->sc_idle_timeout.data = (unsigned long)sc;
397
398 sclog(sc, "alloced\n");
399
400 ret = sc;
401 sc->sc_page = page;
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700402 o2net_debug_add_sc(sc);
Zach Brown98211482005-12-15 14:31:23 -0800403 sc = NULL;
404 page = NULL;
405
406out:
407 if (page)
408 __free_page(page);
409 kfree(sc);
410
411 return ret;
412}
413
414/* ------------------------------------------------------------ */
415
416static void o2net_sc_queue_work(struct o2net_sock_container *sc,
417 struct work_struct *work)
418{
419 sc_get(sc);
420 if (!queue_work(o2net_wq, work))
421 sc_put(sc);
422}
423static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000424 struct delayed_work *work,
Zach Brown98211482005-12-15 14:31:23 -0800425 int delay)
426{
427 sc_get(sc);
428 if (!queue_delayed_work(o2net_wq, work, delay))
429 sc_put(sc);
430}
431static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000432 struct delayed_work *work)
Zach Brown98211482005-12-15 14:31:23 -0800433{
434 if (cancel_delayed_work(work))
435 sc_put(sc);
436}
437
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100438static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
439
440int o2net_num_connected_peers(void)
441{
442 return atomic_read(&o2net_connected_peers);
443}
444
Zach Brown98211482005-12-15 14:31:23 -0800445static void o2net_set_nn_state(struct o2net_node *nn,
446 struct o2net_sock_container *sc,
447 unsigned valid, int err)
448{
449 int was_valid = nn->nn_sc_valid;
450 int was_err = nn->nn_persistent_error;
451 struct o2net_sock_container *old_sc = nn->nn_sc;
452
453 assert_spin_locked(&nn->nn_lock);
454
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100455 if (old_sc && !sc)
456 atomic_dec(&o2net_connected_peers);
457 else if (!old_sc && sc)
458 atomic_inc(&o2net_connected_peers);
459
Zach Brown98211482005-12-15 14:31:23 -0800460 /* the node num comparison and single connect/accept path should stop
461 * an non-null sc from being overwritten with another */
462 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
463 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
464 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
465
Zach Brown98211482005-12-15 14:31:23 -0800466 if (was_valid && !valid && err == 0)
467 err = -ENOTCONN;
468
469 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
470 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
471 nn->nn_persistent_error, err);
472
473 nn->nn_sc = sc;
474 nn->nn_sc_valid = valid ? 1 : 0;
475 nn->nn_persistent_error = err;
476
477 /* mirrors o2net_tx_can_proceed() */
478 if (nn->nn_persistent_error || nn->nn_sc_valid)
479 wake_up(&nn->nn_sc_wq);
480
481 if (!was_err && nn->nn_persistent_error) {
482 o2quo_conn_err(o2net_num_from_nn(nn));
483 queue_delayed_work(o2net_wq, &nn->nn_still_up,
484 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
485 }
486
487 if (was_valid && !valid) {
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700488 printk(KERN_INFO "o2net: no longer connected to "
489 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
Zach Brown98211482005-12-15 14:31:23 -0800490 o2net_complete_nodes_nsw(nn);
491 }
492
493 if (!was_valid && valid) {
494 o2quo_conn_up(o2net_num_from_nn(nn));
Zach Brown98211482005-12-15 14:31:23 -0800495 cancel_delayed_work(&nn->nn_connect_expired);
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700496 printk(KERN_INFO "o2net: %s " SC_NODEF_FMT "\n",
497 o2nm_this_node() > sc->sc_node->nd_num ?
498 "connected to" : "accepted connection from",
499 SC_NODEF_ARGS(sc));
Zach Brown98211482005-12-15 14:31:23 -0800500 }
501
502 /* trigger the connecting worker func as long as we're not valid,
503 * it will back off if it shouldn't connect. This can be called
504 * from node config teardown and so needs to be careful about
505 * the work queue actually being up. */
506 if (!valid && o2net_wq) {
507 unsigned long delay;
508 /* delay if we're withing a RECONNECT_DELAY of the
509 * last attempt */
510 delay = (nn->nn_last_connect_attempt +
Jeff Mahoney409753b2008-03-28 16:44:13 -0700511 msecs_to_jiffies(o2net_reconnect_delay()))
Zach Brown98211482005-12-15 14:31:23 -0800512 - jiffies;
Jeff Mahoney409753b2008-03-28 16:44:13 -0700513 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
Zach Brown98211482005-12-15 14:31:23 -0800514 delay = 0;
515 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
516 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
Tao Ma5cc3bf22008-03-05 15:50:12 +0800517
518 /*
519 * Delay the expired work after idle timeout.
520 *
521 * We might have lots of failed connection attempts that run
522 * through here but we only cancel the connect_expired work when
523 * a connection attempt succeeds. So only the first enqueue of
524 * the connect_expired work will do anything. The rest will see
525 * that it's already queued and do nothing.
526 */
Jeff Mahoney409753b2008-03-28 16:44:13 -0700527 delay += msecs_to_jiffies(o2net_idle_timeout());
Tao Ma5cc3bf22008-03-05 15:50:12 +0800528 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
Zach Brown98211482005-12-15 14:31:23 -0800529 }
530
531 /* keep track of the nn's sc ref for the caller */
532 if ((old_sc == NULL) && sc)
533 sc_get(sc);
534 if (old_sc && (old_sc != sc)) {
535 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
536 sc_put(old_sc);
537 }
538}
539
540/* see o2net_register_callbacks() */
541static void o2net_data_ready(struct sock *sk, int bytes)
542{
543 void (*ready)(struct sock *sk, int bytes);
544
545 read_lock(&sk->sk_callback_lock);
546 if (sk->sk_user_data) {
547 struct o2net_sock_container *sc = sk->sk_user_data;
548 sclog(sc, "data_ready hit\n");
549 do_gettimeofday(&sc->sc_tv_data_ready);
550 o2net_sc_queue_work(sc, &sc->sc_rx_work);
551 ready = sc->sc_data_ready;
552 } else {
553 ready = sk->sk_data_ready;
554 }
555 read_unlock(&sk->sk_callback_lock);
556
557 ready(sk, bytes);
558}
559
560/* see o2net_register_callbacks() */
561static void o2net_state_change(struct sock *sk)
562{
563 void (*state_change)(struct sock *sk);
564 struct o2net_sock_container *sc;
565
566 read_lock(&sk->sk_callback_lock);
567 sc = sk->sk_user_data;
568 if (sc == NULL) {
569 state_change = sk->sk_state_change;
570 goto out;
571 }
572
573 sclog(sc, "state_change to %d\n", sk->sk_state);
574
575 state_change = sc->sc_state_change;
576
577 switch(sk->sk_state) {
578 /* ignore connecting sockets as they make progress */
579 case TCP_SYN_SENT:
580 case TCP_SYN_RECV:
581 break;
582 case TCP_ESTABLISHED:
583 o2net_sc_queue_work(sc, &sc->sc_connect_work);
584 break;
585 default:
586 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
587 break;
588 }
589out:
590 read_unlock(&sk->sk_callback_lock);
591 state_change(sk);
592}
593
594/*
595 * we register callbacks so we can queue work on events before calling
596 * the original callbacks. our callbacks our careful to test user_data
597 * to discover when they've reaced with o2net_unregister_callbacks().
598 */
599static void o2net_register_callbacks(struct sock *sk,
600 struct o2net_sock_container *sc)
601{
602 write_lock_bh(&sk->sk_callback_lock);
603
604 /* accepted sockets inherit the old listen socket data ready */
605 if (sk->sk_data_ready == o2net_listen_data_ready) {
606 sk->sk_data_ready = sk->sk_user_data;
607 sk->sk_user_data = NULL;
608 }
609
610 BUG_ON(sk->sk_user_data != NULL);
611 sk->sk_user_data = sc;
612 sc_get(sc);
613
614 sc->sc_data_ready = sk->sk_data_ready;
615 sc->sc_state_change = sk->sk_state_change;
616 sk->sk_data_ready = o2net_data_ready;
617 sk->sk_state_change = o2net_state_change;
618
Zhen Wei925037b2007-01-23 17:19:59 -0800619 mutex_init(&sc->sc_send_lock);
620
Zach Brown98211482005-12-15 14:31:23 -0800621 write_unlock_bh(&sk->sk_callback_lock);
622}
623
624static int o2net_unregister_callbacks(struct sock *sk,
625 struct o2net_sock_container *sc)
626{
627 int ret = 0;
628
629 write_lock_bh(&sk->sk_callback_lock);
630 if (sk->sk_user_data == sc) {
631 ret = 1;
632 sk->sk_user_data = NULL;
633 sk->sk_data_ready = sc->sc_data_ready;
634 sk->sk_state_change = sc->sc_state_change;
635 }
636 write_unlock_bh(&sk->sk_callback_lock);
637
638 return ret;
639}
640
641/*
642 * this is a little helper that is called by callers who have seen a problem
643 * with an sc and want to detach it from the nn if someone already hasn't beat
644 * them to it. if an error is given then the shutdown will be persistent
645 * and pending transmits will be canceled.
646 */
647static void o2net_ensure_shutdown(struct o2net_node *nn,
648 struct o2net_sock_container *sc,
649 int err)
650{
651 spin_lock(&nn->nn_lock);
652 if (nn->nn_sc == sc)
653 o2net_set_nn_state(nn, NULL, 0, err);
654 spin_unlock(&nn->nn_lock);
655}
656
657/*
658 * This work queue function performs the blocking parts of socket shutdown. A
659 * few paths lead here. set_nn_state will trigger this callback if it sees an
660 * sc detached from the nn. state_change will also trigger this callback
661 * directly when it sees errors. In that case we need to call set_nn_state
662 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
663 * itself.
664 */
David Howellsc4028952006-11-22 14:57:56 +0000665static void o2net_shutdown_sc(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -0800666{
David Howellsc4028952006-11-22 14:57:56 +0000667 struct o2net_sock_container *sc =
668 container_of(work, struct o2net_sock_container,
669 sc_shutdown_work);
Zach Brown98211482005-12-15 14:31:23 -0800670 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
671
672 sclog(sc, "shutting down\n");
673
674 /* drop the callbacks ref and call shutdown only once */
675 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
676 /* we shouldn't flush as we're in the thread, the
677 * races with pending sc work structs are harmless */
678 del_timer_sync(&sc->sc_idle_timeout);
679 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
680 sc_put(sc);
Trond Myklebust91cf45f2007-11-12 18:10:39 -0800681 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
Zach Brown98211482005-12-15 14:31:23 -0800682 }
683
684 /* not fatal so failed connects before the other guy has our
685 * heartbeat can be retried */
686 o2net_ensure_shutdown(nn, sc, 0);
687 sc_put(sc);
688}
689
690/* ------------------------------------------------------------ */
691
692static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
693 u32 key)
694{
695 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
696
697 if (ret == 0)
698 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
699
700 return ret;
701}
702
703static struct o2net_msg_handler *
704o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
705 struct rb_node **ret_parent)
706{
707 struct rb_node **p = &o2net_handler_tree.rb_node;
708 struct rb_node *parent = NULL;
709 struct o2net_msg_handler *nmh, *ret = NULL;
710 int cmp;
711
712 while (*p) {
713 parent = *p;
714 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
715 cmp = o2net_handler_cmp(nmh, msg_type, key);
716
717 if (cmp < 0)
718 p = &(*p)->rb_left;
719 else if (cmp > 0)
720 p = &(*p)->rb_right;
721 else {
722 ret = nmh;
723 break;
724 }
725 }
726
727 if (ret_p != NULL)
728 *ret_p = p;
729 if (ret_parent != NULL)
730 *ret_parent = parent;
731
732 return ret;
733}
734
735static void o2net_handler_kref_release(struct kref *kref)
736{
737 struct o2net_msg_handler *nmh;
738 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
739
740 kfree(nmh);
741}
742
743static void o2net_handler_put(struct o2net_msg_handler *nmh)
744{
745 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
746}
747
748/* max_len is protection for the handler func. incoming messages won't
749 * be given to the handler if their payload is longer than the max. */
750int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
751 o2net_msg_handler_func *func, void *data,
Kurt Hackeld74c9802007-01-17 17:04:25 -0800752 o2net_post_msg_handler_func *post_func,
Zach Brown98211482005-12-15 14:31:23 -0800753 struct list_head *unreg_list)
754{
755 struct o2net_msg_handler *nmh = NULL;
756 struct rb_node **p, *parent;
757 int ret = 0;
758
759 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
760 mlog(0, "max_len for message handler out of range: %u\n",
761 max_len);
762 ret = -EINVAL;
763 goto out;
764 }
765
766 if (!msg_type) {
767 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
768 ret = -EINVAL;
769 goto out;
770
771 }
772 if (!func) {
773 mlog(0, "no message handler provided: %u, %p\n",
774 msg_type, func);
775 ret = -EINVAL;
776 goto out;
777 }
778
Robert P. J. Daycd861282006-12-13 00:34:52 -0800779 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800780 if (nmh == NULL) {
781 ret = -ENOMEM;
782 goto out;
783 }
784
785 nmh->nh_func = func;
786 nmh->nh_func_data = data;
Kurt Hackeld74c9802007-01-17 17:04:25 -0800787 nmh->nh_post_func = post_func;
Zach Brown98211482005-12-15 14:31:23 -0800788 nmh->nh_msg_type = msg_type;
789 nmh->nh_max_len = max_len;
790 nmh->nh_key = key;
791 /* the tree and list get this ref.. they're both removed in
792 * unregister when this ref is dropped */
793 kref_init(&nmh->nh_kref);
794 INIT_LIST_HEAD(&nmh->nh_unregister_item);
795
796 write_lock(&o2net_handler_lock);
797 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
798 ret = -EEXIST;
799 else {
800 rb_link_node(&nmh->nh_node, parent, p);
801 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
802 list_add_tail(&nmh->nh_unregister_item, unreg_list);
803
804 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
805 func, msg_type, key);
806 /* we've had some trouble with handlers seemingly vanishing. */
807 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
808 &parent) == NULL,
809 "couldn't find handler we *just* registerd "
810 "for type %u key %08x\n", msg_type, key);
811 }
812 write_unlock(&o2net_handler_lock);
813 if (ret)
814 goto out;
815
816out:
817 if (ret)
818 kfree(nmh);
819
820 return ret;
821}
822EXPORT_SYMBOL_GPL(o2net_register_handler);
823
824void o2net_unregister_handler_list(struct list_head *list)
825{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200826 struct o2net_msg_handler *nmh, *n;
Zach Brown98211482005-12-15 14:31:23 -0800827
828 write_lock(&o2net_handler_lock);
Christoph Hellwig800deef2007-05-17 16:03:13 +0200829 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
Zach Brown98211482005-12-15 14:31:23 -0800830 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
831 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
832 rb_erase(&nmh->nh_node, &o2net_handler_tree);
833 list_del_init(&nmh->nh_unregister_item);
834 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
835 }
836 write_unlock(&o2net_handler_lock);
837}
838EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
839
840static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
841{
842 struct o2net_msg_handler *nmh;
843
844 read_lock(&o2net_handler_lock);
845 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
846 if (nmh)
847 kref_get(&nmh->nh_kref);
848 read_unlock(&o2net_handler_lock);
849
850 return nmh;
851}
852
853/* ------------------------------------------------------------ */
854
855static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
856{
857 int ret;
858 mm_segment_t oldfs;
859 struct kvec vec = {
860 .iov_len = len,
861 .iov_base = data,
862 };
863 struct msghdr msg = {
864 .msg_iovlen = 1,
865 .msg_iov = (struct iovec *)&vec,
866 .msg_flags = MSG_DONTWAIT,
867 };
868
869 oldfs = get_fs();
870 set_fs(get_ds());
871 ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
872 set_fs(oldfs);
873
874 return ret;
875}
876
877static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
878 size_t veclen, size_t total)
879{
880 int ret;
881 mm_segment_t oldfs;
882 struct msghdr msg = {
883 .msg_iov = (struct iovec *)vec,
884 .msg_iovlen = veclen,
885 };
886
887 if (sock == NULL) {
888 ret = -EINVAL;
889 goto out;
890 }
891
892 oldfs = get_fs();
893 set_fs(get_ds());
894 ret = sock_sendmsg(sock, &msg, total);
895 set_fs(oldfs);
896 if (ret != total) {
897 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
898 total);
899 if (ret >= 0)
900 ret = -EPIPE; /* should be smarter, I bet */
901 goto out;
902 }
903
904 ret = 0;
905out:
906 if (ret < 0)
907 mlog(0, "returning error: %d\n", ret);
908 return ret;
909}
910
911static void o2net_sendpage(struct o2net_sock_container *sc,
912 void *kmalloced_virt,
913 size_t size)
914{
915 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
916 ssize_t ret;
917
Sunil Mushrance17204a2007-07-30 11:02:50 -0700918 while (1) {
919 mutex_lock(&sc->sc_send_lock);
920 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
921 virt_to_page(kmalloced_virt),
922 (long)kmalloced_virt & ~PAGE_MASK,
923 size, MSG_DONTWAIT);
924 mutex_unlock(&sc->sc_send_lock);
925 if (ret == size)
926 break;
927 if (ret == (ssize_t)-EAGAIN) {
928 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
929 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
930 cond_resched();
931 continue;
932 }
Zach Brown98211482005-12-15 14:31:23 -0800933 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
934 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
935 o2net_ensure_shutdown(nn, sc, 0);
Sunil Mushrance17204a2007-07-30 11:02:50 -0700936 break;
Zach Brown98211482005-12-15 14:31:23 -0800937 }
938}
939
940static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
941{
942 memset(msg, 0, sizeof(struct o2net_msg));
943 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
944 msg->data_len = cpu_to_be16(data_len);
945 msg->msg_type = cpu_to_be16(msg_type);
946 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
947 msg->status = 0;
948 msg->key = cpu_to_be32(key);
949}
950
951static int o2net_tx_can_proceed(struct o2net_node *nn,
952 struct o2net_sock_container **sc_ret,
953 int *error)
954{
955 int ret = 0;
956
957 spin_lock(&nn->nn_lock);
958 if (nn->nn_persistent_error) {
959 ret = 1;
960 *sc_ret = NULL;
961 *error = nn->nn_persistent_error;
962 } else if (nn->nn_sc_valid) {
963 kref_get(&nn->nn_sc->sc_kref);
964
965 ret = 1;
966 *sc_ret = nn->nn_sc;
967 *error = 0;
968 }
969 spin_unlock(&nn->nn_lock);
970
971 return ret;
972}
973
974int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
975 size_t caller_veclen, u8 target_node, int *status)
976{
Sunil Mushran9af0b382009-06-11 11:02:03 -0700977 int ret;
Zach Brown98211482005-12-15 14:31:23 -0800978 struct o2net_msg *msg = NULL;
979 size_t veclen, caller_bytes = 0;
980 struct kvec *vec = NULL;
981 struct o2net_sock_container *sc = NULL;
982 struct o2net_node *nn = o2net_nn_from_num(target_node);
983 struct o2net_status_wait nsw = {
984 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
985 };
Sunil Mushran2309e9e2008-04-14 10:46:19 -0700986 struct o2net_send_tracking nst;
987
988 o2net_init_nst(&nst, msg_type, key, current, target_node);
Zach Brown98211482005-12-15 14:31:23 -0800989
990 if (o2net_wq == NULL) {
991 mlog(0, "attempt to tx without o2netd running\n");
992 ret = -ESRCH;
993 goto out;
994 }
995
996 if (caller_veclen == 0) {
997 mlog(0, "bad kvec array length\n");
998 ret = -EINVAL;
999 goto out;
1000 }
1001
1002 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1003 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1004 mlog(0, "total payload len %zu too large\n", caller_bytes);
1005 ret = -EINVAL;
1006 goto out;
1007 }
1008
1009 if (target_node == o2nm_this_node()) {
1010 ret = -ELOOP;
1011 goto out;
1012 }
1013
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001014 o2net_debug_add_nst(&nst);
1015
1016 o2net_set_nst_sock_time(&nst);
1017
Sunil Mushran9af0b382009-06-11 11:02:03 -07001018 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
Zach Brown98211482005-12-15 14:31:23 -08001019 if (ret)
1020 goto out;
1021
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001022 o2net_set_nst_sock_container(&nst, sc);
1023
Zach Brown98211482005-12-15 14:31:23 -08001024 veclen = caller_veclen + 1;
1025 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
1026 if (vec == NULL) {
1027 mlog(0, "failed to %zu element kvec!\n", veclen);
1028 ret = -ENOMEM;
1029 goto out;
1030 }
1031
1032 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1033 if (!msg) {
1034 mlog(0, "failed to allocate a o2net_msg!\n");
1035 ret = -ENOMEM;
1036 goto out;
1037 }
1038
1039 o2net_init_msg(msg, caller_bytes, msg_type, key);
1040
1041 vec[0].iov_len = sizeof(struct o2net_msg);
1042 vec[0].iov_base = msg;
1043 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1044
1045 ret = o2net_prep_nsw(nn, &nsw);
1046 if (ret)
1047 goto out;
1048
1049 msg->msg_num = cpu_to_be32(nsw.ns_id);
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001050 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1051
1052 o2net_set_nst_send_time(&nst);
Zach Brown98211482005-12-15 14:31:23 -08001053
1054 /* finally, convert the message header to network byte-order
1055 * and send */
Zhen Wei925037b2007-01-23 17:19:59 -08001056 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001057 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1058 sizeof(struct o2net_msg) + caller_bytes);
Zhen Wei925037b2007-01-23 17:19:59 -08001059 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001060 msglog(msg, "sending returned %d\n", ret);
1061 if (ret < 0) {
1062 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1063 goto out;
1064 }
1065
1066 /* wait on other node's handler */
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001067 o2net_set_nst_status_time(&nst);
Zach Brown98211482005-12-15 14:31:23 -08001068 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1069
1070 /* Note that we avoid overwriting the callers status return
1071 * variable if a system error was reported on the other
1072 * side. Callers beware. */
1073 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1074 if (status && !ret)
1075 *status = nsw.ns_status;
1076
1077 mlog(0, "woken, returning system status %d, user status %d\n",
1078 ret, nsw.ns_status);
1079out:
Sunil Mushran2309e9e2008-04-14 10:46:19 -07001080 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
Zach Brown98211482005-12-15 14:31:23 -08001081 if (sc)
1082 sc_put(sc);
1083 if (vec)
1084 kfree(vec);
1085 if (msg)
1086 kfree(msg);
1087 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1088 return ret;
1089}
1090EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1091
1092int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1093 u8 target_node, int *status)
1094{
1095 struct kvec vec = {
1096 .iov_base = data,
1097 .iov_len = len,
1098 };
1099 return o2net_send_message_vec(msg_type, key, &vec, 1,
1100 target_node, status);
1101}
1102EXPORT_SYMBOL_GPL(o2net_send_message);
1103
1104static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1105 enum o2net_system_error syserr, int err)
1106{
1107 struct kvec vec = {
1108 .iov_base = hdr,
1109 .iov_len = sizeof(struct o2net_msg),
1110 };
1111
1112 BUG_ON(syserr >= O2NET_ERR_MAX);
1113
1114 /* leave other fields intact from the incoming message, msg_num
1115 * in particular */
1116 hdr->sys_status = cpu_to_be32(syserr);
1117 hdr->status = cpu_to_be32(err);
1118 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1119 hdr->data_len = 0;
1120
1121 msglog(hdr, "about to send status magic %d\n", err);
1122 /* hdr has been in host byteorder this whole time */
1123 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1124}
1125
1126/* this returns -errno if the header was unknown or too large, etc.
1127 * after this is called the buffer us reused for the next message */
1128static int o2net_process_message(struct o2net_sock_container *sc,
1129 struct o2net_msg *hdr)
1130{
1131 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1132 int ret = 0, handler_status;
1133 enum o2net_system_error syserr;
1134 struct o2net_msg_handler *nmh = NULL;
Kurt Hackeld74c9802007-01-17 17:04:25 -08001135 void *ret_data = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001136
1137 msglog(hdr, "processing message\n");
1138
1139 o2net_sc_postpone_idle(sc);
1140
1141 switch(be16_to_cpu(hdr->magic)) {
1142 case O2NET_MSG_STATUS_MAGIC:
1143 /* special type for returning message status */
1144 o2net_complete_nsw(nn, NULL,
1145 be32_to_cpu(hdr->msg_num),
1146 be32_to_cpu(hdr->sys_status),
1147 be32_to_cpu(hdr->status));
1148 goto out;
1149 case O2NET_MSG_KEEP_REQ_MAGIC:
1150 o2net_sendpage(sc, o2net_keep_resp,
1151 sizeof(*o2net_keep_resp));
1152 goto out;
1153 case O2NET_MSG_KEEP_RESP_MAGIC:
1154 goto out;
1155 case O2NET_MSG_MAGIC:
1156 break;
1157 default:
1158 msglog(hdr, "bad magic\n");
1159 ret = -EINVAL;
1160 goto out;
1161 break;
1162 }
1163
1164 /* find a handler for it */
1165 handler_status = 0;
1166 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1167 be32_to_cpu(hdr->key));
1168 if (!nmh) {
1169 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1170 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1171 syserr = O2NET_ERR_NO_HNDLR;
1172 goto out_respond;
1173 }
1174
1175 syserr = O2NET_ERR_NONE;
1176
1177 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1178 syserr = O2NET_ERR_OVERFLOW;
1179
1180 if (syserr != O2NET_ERR_NONE)
1181 goto out_respond;
1182
1183 do_gettimeofday(&sc->sc_tv_func_start);
1184 sc->sc_msg_key = be32_to_cpu(hdr->key);
1185 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1186 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1187 be16_to_cpu(hdr->data_len),
Kurt Hackeld74c9802007-01-17 17:04:25 -08001188 nmh->nh_func_data, &ret_data);
Zach Brown98211482005-12-15 14:31:23 -08001189 do_gettimeofday(&sc->sc_tv_func_stop);
1190
1191out_respond:
1192 /* this destroys the hdr, so don't use it after this */
Zhen Wei925037b2007-01-23 17:19:59 -08001193 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001194 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1195 handler_status);
Zhen Wei925037b2007-01-23 17:19:59 -08001196 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001197 hdr = NULL;
1198 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1199 handler_status, syserr, ret);
1200
Kurt Hackeld74c9802007-01-17 17:04:25 -08001201 if (nmh) {
1202 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1203 if (nmh->nh_post_func)
1204 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1205 ret_data);
1206 }
1207
Zach Brown98211482005-12-15 14:31:23 -08001208out:
1209 if (nmh)
1210 o2net_handler_put(nmh);
1211 return ret;
1212}
1213
1214static int o2net_check_handshake(struct o2net_sock_container *sc)
1215{
1216 struct o2net_handshake *hand = page_address(sc->sc_page);
1217 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1218
1219 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1220 mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol "
1221 "version %llu but %llu is required, disconnecting\n",
1222 SC_NODEF_ARGS(sc),
1223 (unsigned long long)be64_to_cpu(hand->protocol_version),
1224 O2NET_PROTOCOL_VERSION);
1225
1226 /* don't bother reconnecting if its the wrong version. */
1227 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1228 return -1;
1229 }
1230
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001231 /*
1232 * Ensure timeouts are consistent with other nodes, otherwise
1233 * we can end up with one node thinking that the other must be down,
1234 * but isn't. This can ultimately cause corruption.
1235 */
1236 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
Jeff Mahoney409753b2008-03-28 16:44:13 -07001237 o2net_idle_timeout()) {
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001238 mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of "
1239 "%u ms, but we use %u ms locally. disconnecting\n",
1240 SC_NODEF_ARGS(sc),
1241 be32_to_cpu(hand->o2net_idle_timeout_ms),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001242 o2net_idle_timeout());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001243 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1244 return -1;
1245 }
1246
1247 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
Jeff Mahoney409753b2008-03-28 16:44:13 -07001248 o2net_keepalive_delay()) {
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001249 mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of "
1250 "%u ms, but we use %u ms locally. disconnecting\n",
1251 SC_NODEF_ARGS(sc),
1252 be32_to_cpu(hand->o2net_keepalive_delay_ms),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001253 o2net_keepalive_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001254 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1255 return -1;
1256 }
1257
1258 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1259 O2HB_MAX_WRITE_TIMEOUT_MS) {
1260 mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of "
1261 "%u ms, but we use %u ms locally. disconnecting\n",
1262 SC_NODEF_ARGS(sc),
1263 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1264 O2HB_MAX_WRITE_TIMEOUT_MS);
1265 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1266 return -1;
1267 }
1268
Zach Brown98211482005-12-15 14:31:23 -08001269 sc->sc_handshake_ok = 1;
1270
1271 spin_lock(&nn->nn_lock);
1272 /* set valid and queue the idle timers only if it hasn't been
1273 * shut down already */
1274 if (nn->nn_sc == sc) {
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001275 o2net_sc_reset_idle_timer(sc);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001276 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001277 o2net_set_nn_state(nn, sc, 1, 0);
1278 }
1279 spin_unlock(&nn->nn_lock);
1280
1281 /* shift everything up as though it wasn't there */
1282 sc->sc_page_off -= sizeof(struct o2net_handshake);
1283 if (sc->sc_page_off)
1284 memmove(hand, hand + 1, sc->sc_page_off);
1285
1286 return 0;
1287}
1288
1289/* this demuxes the queued rx bytes into header or payload bits and calls
1290 * handlers as each full message is read off the socket. it returns -error,
1291 * == 0 eof, or > 0 for progress made.*/
1292static int o2net_advance_rx(struct o2net_sock_container *sc)
1293{
1294 struct o2net_msg *hdr;
1295 int ret = 0;
1296 void *data;
1297 size_t datalen;
1298
1299 sclog(sc, "receiving\n");
1300 do_gettimeofday(&sc->sc_tv_advance_start);
1301
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001302 if (unlikely(sc->sc_handshake_ok == 0)) {
1303 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1304 data = page_address(sc->sc_page) + sc->sc_page_off;
1305 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1306 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1307 if (ret > 0)
1308 sc->sc_page_off += ret;
1309 }
1310
1311 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1312 o2net_check_handshake(sc);
1313 if (unlikely(sc->sc_handshake_ok == 0))
1314 ret = -EPROTO;
1315 }
1316 goto out;
1317 }
1318
Zach Brown98211482005-12-15 14:31:23 -08001319 /* do we need more header? */
1320 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1321 data = page_address(sc->sc_page) + sc->sc_page_off;
1322 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1323 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1324 if (ret > 0) {
1325 sc->sc_page_off += ret;
Zach Brown98211482005-12-15 14:31:23 -08001326 /* only swab incoming here.. we can
1327 * only get here once as we cross from
1328 * being under to over */
1329 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1330 hdr = page_address(sc->sc_page);
1331 if (be16_to_cpu(hdr->data_len) >
1332 O2NET_MAX_PAYLOAD_BYTES)
1333 ret = -EOVERFLOW;
1334 }
1335 }
1336 if (ret <= 0)
1337 goto out;
1338 }
1339
1340 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1341 /* oof, still don't have a header */
1342 goto out;
1343 }
1344
1345 /* this was swabbed above when we first read it */
1346 hdr = page_address(sc->sc_page);
1347
1348 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1349
1350 /* do we need more payload? */
1351 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1352 /* need more payload */
1353 data = page_address(sc->sc_page) + sc->sc_page_off;
1354 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1355 sc->sc_page_off;
1356 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1357 if (ret > 0)
1358 sc->sc_page_off += ret;
1359 if (ret <= 0)
1360 goto out;
1361 }
1362
1363 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1364 /* we can only get here once, the first time we read
1365 * the payload.. so set ret to progress if the handler
1366 * works out. after calling this the message is toast */
1367 ret = o2net_process_message(sc, hdr);
1368 if (ret == 0)
1369 ret = 1;
1370 sc->sc_page_off = 0;
1371 }
1372
1373out:
1374 sclog(sc, "ret = %d\n", ret);
1375 do_gettimeofday(&sc->sc_tv_advance_stop);
1376 return ret;
1377}
1378
1379/* this work func is triggerd by data ready. it reads until it can read no
1380 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1381 * our work the work struct will be marked and we'll be called again. */
David Howellsc4028952006-11-22 14:57:56 +00001382static void o2net_rx_until_empty(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001383{
David Howellsc4028952006-11-22 14:57:56 +00001384 struct o2net_sock_container *sc =
1385 container_of(work, struct o2net_sock_container, sc_rx_work);
Zach Brown98211482005-12-15 14:31:23 -08001386 int ret;
1387
1388 do {
1389 ret = o2net_advance_rx(sc);
1390 } while (ret > 0);
1391
1392 if (ret <= 0 && ret != -EAGAIN) {
1393 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1394 sclog(sc, "saw error %d, closing\n", ret);
1395 /* not permanent so read failed handshake can retry */
1396 o2net_ensure_shutdown(nn, sc, 0);
1397 }
1398
1399 sc_put(sc);
1400}
1401
1402static int o2net_set_nodelay(struct socket *sock)
1403{
1404 int ret, val = 1;
1405 mm_segment_t oldfs;
1406
1407 oldfs = get_fs();
1408 set_fs(KERNEL_DS);
1409
1410 /*
1411 * Dear unsuspecting programmer,
1412 *
1413 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1414 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1415 * silently turn into SO_DEBUG.
1416 *
1417 * Yours,
1418 * Keeper of hilariously fragile interfaces.
1419 */
1420 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1421 (char __user *)&val, sizeof(val));
1422
1423 set_fs(oldfs);
1424 return ret;
1425}
1426
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001427static void o2net_initialize_handshake(void)
1428{
1429 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1430 O2HB_MAX_WRITE_TIMEOUT_MS);
Jeff Mahoney409753b2008-03-28 16:44:13 -07001431 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001432 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
Jeff Mahoney409753b2008-03-28 16:44:13 -07001433 o2net_keepalive_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001434 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
Jeff Mahoney409753b2008-03-28 16:44:13 -07001435 o2net_reconnect_delay());
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001436}
1437
Zach Brown98211482005-12-15 14:31:23 -08001438/* ------------------------------------------------------------ */
1439
1440/* called when a connect completes and after a sock is accepted. the
1441 * rx path will see the response and mark the sc valid */
David Howellsc4028952006-11-22 14:57:56 +00001442static void o2net_sc_connect_completed(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001443{
David Howellsc4028952006-11-22 14:57:56 +00001444 struct o2net_sock_container *sc =
1445 container_of(work, struct o2net_sock_container,
1446 sc_connect_work);
Zach Brown98211482005-12-15 14:31:23 -08001447
1448 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1449 (unsigned long long)O2NET_PROTOCOL_VERSION,
1450 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1451
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001452 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001453 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1454 sc_put(sc);
1455}
1456
1457/* this is called as a work_struct func. */
David Howellsc4028952006-11-22 14:57:56 +00001458static void o2net_sc_send_keep_req(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001459{
David Howellsc4028952006-11-22 14:57:56 +00001460 struct o2net_sock_container *sc =
1461 container_of(work, struct o2net_sock_container,
1462 sc_keepalive_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001463
1464 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1465 sc_put(sc);
1466}
1467
1468/* socket shutdown does a del_timer_sync against this as it tears down.
1469 * we can't start this timer until we've got to the point in sc buildup
1470 * where shutdown is going to be involved */
1471static void o2net_idle_timer(unsigned long data)
1472{
1473 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
Tao Ma5cc3bf22008-03-05 15:50:12 +08001474 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
Zach Brown98211482005-12-15 14:31:23 -08001475 struct timeval now;
1476
1477 do_gettimeofday(&now);
1478
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001479 printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u "
1480 "seconds, shutting it down.\n", SC_NODEF_ARGS(sc),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001481 o2net_idle_timeout() / 1000,
1482 o2net_idle_timeout() % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001483 mlog(ML_NOTICE, "here are some times that might help debug the "
1484 "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv "
1485 "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n",
Mark Fasheh215c7f92006-02-01 16:42:10 -08001486 sc->sc_tv_timer.tv_sec, (long) sc->sc_tv_timer.tv_usec,
1487 now.tv_sec, (long) now.tv_usec,
1488 sc->sc_tv_data_ready.tv_sec, (long) sc->sc_tv_data_ready.tv_usec,
1489 sc->sc_tv_advance_start.tv_sec,
1490 (long) sc->sc_tv_advance_start.tv_usec,
1491 sc->sc_tv_advance_stop.tv_sec,
1492 (long) sc->sc_tv_advance_stop.tv_usec,
Zach Brown98211482005-12-15 14:31:23 -08001493 sc->sc_msg_key, sc->sc_msg_type,
Mark Fasheh215c7f92006-02-01 16:42:10 -08001494 sc->sc_tv_func_start.tv_sec, (long) sc->sc_tv_func_start.tv_usec,
1495 sc->sc_tv_func_stop.tv_sec, (long) sc->sc_tv_func_stop.tv_usec);
Zach Brown98211482005-12-15 14:31:23 -08001496
Tao Ma5cc3bf22008-03-05 15:50:12 +08001497 /*
1498 * Initialize the nn_timeout so that the next connection attempt
1499 * will continue in o2net_start_connect.
1500 */
1501 atomic_set(&nn->nn_timeout, 1);
1502
Zach Brown98211482005-12-15 14:31:23 -08001503 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
1504}
1505
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001506static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
Zach Brown98211482005-12-15 14:31:23 -08001507{
1508 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1509 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
Jeff Mahoney409753b2008-03-28 16:44:13 -07001510 msecs_to_jiffies(o2net_keepalive_delay()));
Zach Brown98211482005-12-15 14:31:23 -08001511 do_gettimeofday(&sc->sc_tv_timer);
1512 mod_timer(&sc->sc_idle_timeout,
Jeff Mahoney409753b2008-03-28 16:44:13 -07001513 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001514}
1515
1516static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1517{
1518 /* Only push out an existing timer */
1519 if (timer_pending(&sc->sc_idle_timeout))
1520 o2net_sc_reset_idle_timer(sc);
Zach Brown98211482005-12-15 14:31:23 -08001521}
1522
1523/* this work func is kicked whenever a path sets the nn state which doesn't
1524 * have valid set. This includes seeing hb come up, losing a connection,
1525 * having a connect attempt fail, etc. This centralizes the logic which decides
1526 * if a connect attempt should be made or if we should give up and all future
1527 * transmit attempts should fail */
David Howellsc4028952006-11-22 14:57:56 +00001528static void o2net_start_connect(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001529{
David Howellsc4028952006-11-22 14:57:56 +00001530 struct o2net_node *nn =
1531 container_of(work, struct o2net_node, nn_connect_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001532 struct o2net_sock_container *sc = NULL;
Sunil Mushranb7668c72006-02-28 23:28:01 -08001533 struct o2nm_node *node = NULL, *mynode = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001534 struct socket *sock = NULL;
1535 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
David Howellsc4028952006-11-22 14:57:56 +00001536 int ret = 0, stop;
Tao Ma5cc3bf22008-03-05 15:50:12 +08001537 unsigned int timeout;
Zach Brown98211482005-12-15 14:31:23 -08001538
1539 /* if we're greater we initiate tx, otherwise we accept */
1540 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1541 goto out;
1542
1543 /* watch for racing with tearing a node down */
1544 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1545 if (node == NULL) {
1546 ret = 0;
1547 goto out;
1548 }
1549
Sunil Mushranb7668c72006-02-28 23:28:01 -08001550 mynode = o2nm_get_node_by_num(o2nm_this_node());
1551 if (mynode == NULL) {
1552 ret = 0;
1553 goto out;
1554 }
1555
Zach Brown98211482005-12-15 14:31:23 -08001556 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001557 /*
1558 * see if we already have one pending or have given up.
1559 * For nn_timeout, it is set when we close the connection
1560 * because of the idle time out. So it means that we have
1561 * at least connected to that node successfully once,
1562 * now try to connect to it again.
1563 */
1564 timeout = atomic_read(&nn->nn_timeout);
1565 stop = (nn->nn_sc ||
1566 (nn->nn_persistent_error &&
1567 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
Zach Brown98211482005-12-15 14:31:23 -08001568 spin_unlock(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00001569 if (stop)
Zach Brown98211482005-12-15 14:31:23 -08001570 goto out;
1571
1572 nn->nn_last_connect_attempt = jiffies;
1573
1574 sc = sc_alloc(node);
1575 if (sc == NULL) {
1576 mlog(0, "couldn't allocate sc\n");
1577 ret = -ENOMEM;
1578 goto out;
1579 }
1580
1581 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1582 if (ret < 0) {
1583 mlog(0, "can't create socket: %d\n", ret);
1584 goto out;
1585 }
1586 sc->sc_sock = sock; /* freed by sc_kref_release */
1587
1588 sock->sk->sk_allocation = GFP_ATOMIC;
1589
1590 myaddr.sin_family = AF_INET;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001591 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
Al Viro97bd7912007-12-05 08:46:47 +00001592 myaddr.sin_port = htons(0); /* any port */
Zach Brown98211482005-12-15 14:31:23 -08001593
1594 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1595 sizeof(myaddr));
1596 if (ret) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001597 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1598 ret, &mynode->nd_ipv4_address);
Zach Brown98211482005-12-15 14:31:23 -08001599 goto out;
1600 }
1601
1602 ret = o2net_set_nodelay(sc->sc_sock);
1603 if (ret) {
1604 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1605 goto out;
1606 }
1607
1608 o2net_register_callbacks(sc->sc_sock->sk, sc);
1609
1610 spin_lock(&nn->nn_lock);
1611 /* handshake completion will set nn->nn_sc_valid */
1612 o2net_set_nn_state(nn, sc, 0, 0);
1613 spin_unlock(&nn->nn_lock);
1614
1615 remoteaddr.sin_family = AF_INET;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001616 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1617 remoteaddr.sin_port = node->nd_ipv4_port;
Zach Brown98211482005-12-15 14:31:23 -08001618
1619 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1620 (struct sockaddr *)&remoteaddr,
1621 sizeof(remoteaddr),
1622 O_NONBLOCK);
1623 if (ret == -EINPROGRESS)
1624 ret = 0;
1625
1626out:
1627 if (ret) {
1628 mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed "
1629 "with errno %d\n", SC_NODEF_ARGS(sc), ret);
1630 /* 0 err so that another will be queued and attempted
1631 * from set_nn_state */
1632 if (sc)
1633 o2net_ensure_shutdown(nn, sc, 0);
1634 }
1635 if (sc)
1636 sc_put(sc);
1637 if (node)
1638 o2nm_node_put(node);
Sunil Mushranb7668c72006-02-28 23:28:01 -08001639 if (mynode)
1640 o2nm_node_put(mynode);
Zach Brown98211482005-12-15 14:31:23 -08001641
1642 return;
1643}
1644
David Howellsc4028952006-11-22 14:57:56 +00001645static void o2net_connect_expired(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001646{
David Howellsc4028952006-11-22 14:57:56 +00001647 struct o2net_node *nn =
1648 container_of(work, struct o2net_node, nn_connect_expired.work);
Zach Brown98211482005-12-15 14:31:23 -08001649
1650 spin_lock(&nn->nn_lock);
1651 if (!nn->nn_sc_valid) {
1652 mlog(ML_ERROR, "no connection established with node %u after "
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001653 "%u.%u seconds, giving up and returning errors.\n",
1654 o2net_num_from_nn(nn),
Jeff Mahoney409753b2008-03-28 16:44:13 -07001655 o2net_idle_timeout() / 1000,
1656 o2net_idle_timeout() % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001657
1658 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1659 }
1660 spin_unlock(&nn->nn_lock);
1661}
1662
David Howellsc4028952006-11-22 14:57:56 +00001663static void o2net_still_up(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001664{
David Howellsc4028952006-11-22 14:57:56 +00001665 struct o2net_node *nn =
1666 container_of(work, struct o2net_node, nn_still_up.work);
Zach Brown98211482005-12-15 14:31:23 -08001667
1668 o2quo_hb_still_up(o2net_num_from_nn(nn));
1669}
1670
1671/* ------------------------------------------------------------ */
1672
1673void o2net_disconnect_node(struct o2nm_node *node)
1674{
1675 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1676
1677 /* don't reconnect until it's heartbeating again */
1678 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001679 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001680 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1681 spin_unlock(&nn->nn_lock);
1682
1683 if (o2net_wq) {
1684 cancel_delayed_work(&nn->nn_connect_expired);
1685 cancel_delayed_work(&nn->nn_connect_work);
1686 cancel_delayed_work(&nn->nn_still_up);
1687 flush_workqueue(o2net_wq);
1688 }
1689}
1690
1691static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1692 void *data)
1693{
1694 o2quo_hb_down(node_num);
1695
1696 if (node_num != o2nm_this_node())
1697 o2net_disconnect_node(node);
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001698
1699 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
Zach Brown98211482005-12-15 14:31:23 -08001700}
1701
1702static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1703 void *data)
1704{
1705 struct o2net_node *nn = o2net_nn_from_num(node_num);
1706
1707 o2quo_hb_up(node_num);
1708
1709 /* ensure an immediate connect attempt */
1710 nn->nn_last_connect_attempt = jiffies -
Jeff Mahoney409753b2008-03-28 16:44:13 -07001711 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
Zach Brown98211482005-12-15 14:31:23 -08001712
1713 if (node_num != o2nm_this_node()) {
Zach Brown98211482005-12-15 14:31:23 -08001714 /* believe it or not, accept and node hearbeating testing
1715 * can succeed for this node before we got here.. so
1716 * only use set_nn_state to clear the persistent error
1717 * if that hasn't already happened */
1718 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001719 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001720 if (nn->nn_persistent_error)
1721 o2net_set_nn_state(nn, NULL, 0, 0);
1722 spin_unlock(&nn->nn_lock);
1723 }
1724}
1725
1726void o2net_unregister_hb_callbacks(void)
1727{
Joel Becker14829422007-06-14 21:40:49 -07001728 o2hb_unregister_callback(NULL, &o2net_hb_up);
1729 o2hb_unregister_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001730}
1731
1732int o2net_register_hb_callbacks(void)
1733{
1734 int ret;
1735
1736 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1737 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1738 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1739 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1740
Joel Becker14829422007-06-14 21:40:49 -07001741 ret = o2hb_register_callback(NULL, &o2net_hb_up);
Zach Brown98211482005-12-15 14:31:23 -08001742 if (ret == 0)
Joel Becker14829422007-06-14 21:40:49 -07001743 ret = o2hb_register_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001744
1745 if (ret)
1746 o2net_unregister_hb_callbacks();
1747
1748 return ret;
1749}
1750
1751/* ------------------------------------------------------------ */
1752
1753static int o2net_accept_one(struct socket *sock)
1754{
1755 int ret, slen;
1756 struct sockaddr_in sin;
1757 struct socket *new_sock = NULL;
1758 struct o2nm_node *node = NULL;
1759 struct o2net_sock_container *sc = NULL;
1760 struct o2net_node *nn;
1761
1762 BUG_ON(sock == NULL);
1763 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1764 sock->sk->sk_protocol, &new_sock);
1765 if (ret)
1766 goto out;
1767
1768 new_sock->type = sock->type;
1769 new_sock->ops = sock->ops;
1770 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1771 if (ret < 0)
1772 goto out;
1773
1774 new_sock->sk->sk_allocation = GFP_ATOMIC;
1775
1776 ret = o2net_set_nodelay(new_sock);
1777 if (ret) {
1778 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1779 goto out;
1780 }
1781
1782 slen = sizeof(sin);
1783 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1784 &slen, 1);
1785 if (ret < 0)
1786 goto out;
1787
Al Viro97bd7912007-12-05 08:46:47 +00001788 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
Zach Brown98211482005-12-15 14:31:23 -08001789 if (node == NULL) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001790 mlog(ML_NOTICE, "attempt to connect from unknown node at %pI4:%d\n",
1791 &sin.sin_addr.s_addr, ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001792 ret = -EINVAL;
1793 goto out;
1794 }
1795
1796 if (o2nm_this_node() > node->nd_num) {
1797 mlog(ML_NOTICE, "unexpected connect attempted from a lower "
Harvey Harrisonbe859402008-10-31 00:56:28 -07001798 "numbered node '%s' at " "%pI4:%d with num %u\n",
1799 node->nd_name, &sin.sin_addr.s_addr,
Al Viro97bd7912007-12-05 08:46:47 +00001800 ntohs(sin.sin_port), node->nd_num);
Zach Brown98211482005-12-15 14:31:23 -08001801 ret = -EINVAL;
1802 goto out;
1803 }
1804
1805 /* this happens all the time when the other node sees our heartbeat
1806 * and tries to connect before we see their heartbeat */
1807 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1808 mlog(ML_CONN, "attempt to connect from node '%s' at "
Harvey Harrisonbe859402008-10-31 00:56:28 -07001809 "%pI4:%d but it isn't heartbeating\n",
1810 node->nd_name, &sin.sin_addr.s_addr,
Al Viro97bd7912007-12-05 08:46:47 +00001811 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001812 ret = -EINVAL;
1813 goto out;
1814 }
1815
1816 nn = o2net_nn_from_num(node->nd_num);
1817
1818 spin_lock(&nn->nn_lock);
1819 if (nn->nn_sc)
1820 ret = -EBUSY;
1821 else
1822 ret = 0;
1823 spin_unlock(&nn->nn_lock);
1824 if (ret) {
1825 mlog(ML_NOTICE, "attempt to connect from node '%s' at "
Harvey Harrisonbe859402008-10-31 00:56:28 -07001826 "%pI4:%d but it already has an open connection\n",
1827 node->nd_name, &sin.sin_addr.s_addr,
Al Viro97bd7912007-12-05 08:46:47 +00001828 ntohs(sin.sin_port));
Zach Brown98211482005-12-15 14:31:23 -08001829 goto out;
1830 }
1831
1832 sc = sc_alloc(node);
1833 if (sc == NULL) {
1834 ret = -ENOMEM;
1835 goto out;
1836 }
1837
1838 sc->sc_sock = new_sock;
1839 new_sock = NULL;
1840
1841 spin_lock(&nn->nn_lock);
Tao Ma5cc3bf22008-03-05 15:50:12 +08001842 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08001843 o2net_set_nn_state(nn, sc, 0, 0);
1844 spin_unlock(&nn->nn_lock);
1845
1846 o2net_register_callbacks(sc->sc_sock->sk, sc);
1847 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1848
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001849 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001850 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1851
1852out:
1853 if (new_sock)
1854 sock_release(new_sock);
1855 if (node)
1856 o2nm_node_put(node);
1857 if (sc)
1858 sc_put(sc);
1859 return ret;
1860}
1861
David Howellsc4028952006-11-22 14:57:56 +00001862static void o2net_accept_many(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001863{
David Howellsc4028952006-11-22 14:57:56 +00001864 struct socket *sock = o2net_listen_sock;
Zach Brown98211482005-12-15 14:31:23 -08001865 while (o2net_accept_one(sock) == 0)
1866 cond_resched();
1867}
1868
1869static void o2net_listen_data_ready(struct sock *sk, int bytes)
1870{
1871 void (*ready)(struct sock *sk, int bytes);
1872
1873 read_lock(&sk->sk_callback_lock);
1874 ready = sk->sk_user_data;
1875 if (ready == NULL) { /* check for teardown race */
1876 ready = sk->sk_data_ready;
1877 goto out;
1878 }
1879
1880 /* ->sk_data_ready is also called for a newly established child socket
1881 * before it has been accepted and the acceptor has set up their
1882 * data_ready.. we only want to queue listen work for our listening
1883 * socket */
1884 if (sk->sk_state == TCP_LISTEN) {
1885 mlog(ML_TCP, "bytes: %d\n", bytes);
1886 queue_work(o2net_wq, &o2net_listen_work);
1887 }
1888
1889out:
1890 read_unlock(&sk->sk_callback_lock);
1891 ready(sk, bytes);
1892}
1893
Sunil Mushranab81afd2007-01-29 14:57:14 -08001894static int o2net_open_listening_sock(__be32 addr, __be16 port)
Zach Brown98211482005-12-15 14:31:23 -08001895{
1896 struct socket *sock = NULL;
1897 int ret;
1898 struct sockaddr_in sin = {
1899 .sin_family = PF_INET,
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001900 .sin_addr = { .s_addr = addr },
1901 .sin_port = port,
Zach Brown98211482005-12-15 14:31:23 -08001902 };
1903
1904 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1905 if (ret < 0) {
1906 mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret);
1907 goto out;
1908 }
1909
1910 sock->sk->sk_allocation = GFP_ATOMIC;
1911
1912 write_lock_bh(&sock->sk->sk_callback_lock);
1913 sock->sk->sk_user_data = sock->sk->sk_data_ready;
1914 sock->sk->sk_data_ready = o2net_listen_data_ready;
1915 write_unlock_bh(&sock->sk->sk_callback_lock);
1916
1917 o2net_listen_sock = sock;
David Howellsc4028952006-11-22 14:57:56 +00001918 INIT_WORK(&o2net_listen_work, o2net_accept_many);
Zach Brown98211482005-12-15 14:31:23 -08001919
1920 sock->sk->sk_reuse = 1;
1921 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
1922 if (ret < 0) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001923 mlog(ML_ERROR, "unable to bind socket at %pI4:%u, "
1924 "ret=%d\n", &addr, ntohs(port), ret);
Zach Brown98211482005-12-15 14:31:23 -08001925 goto out;
1926 }
1927
1928 ret = sock->ops->listen(sock, 64);
1929 if (ret < 0) {
Harvey Harrisonbe859402008-10-31 00:56:28 -07001930 mlog(ML_ERROR, "unable to listen on %pI4:%u, ret=%d\n",
1931 &addr, ntohs(port), ret);
Zach Brown98211482005-12-15 14:31:23 -08001932 }
1933
1934out:
1935 if (ret) {
1936 o2net_listen_sock = NULL;
1937 if (sock)
1938 sock_release(sock);
1939 }
1940 return ret;
1941}
1942
1943/*
1944 * called from node manager when we should bring up our network listening
1945 * socket. node manager handles all the serialization to only call this
1946 * once and to match it with o2net_stop_listening(). note,
1947 * o2nm_this_node() doesn't work yet as we're being called while it
1948 * is being set up.
1949 */
1950int o2net_start_listening(struct o2nm_node *node)
1951{
1952 int ret = 0;
1953
1954 BUG_ON(o2net_wq != NULL);
1955 BUG_ON(o2net_listen_sock != NULL);
1956
1957 mlog(ML_KTHREAD, "starting o2net thread...\n");
1958 o2net_wq = create_singlethread_workqueue("o2net");
1959 if (o2net_wq == NULL) {
1960 mlog(ML_ERROR, "unable to launch o2net thread\n");
1961 return -ENOMEM; /* ? */
1962 }
1963
Sunil Mushranab81afd2007-01-29 14:57:14 -08001964 ret = o2net_open_listening_sock(node->nd_ipv4_address,
1965 node->nd_ipv4_port);
Zach Brown98211482005-12-15 14:31:23 -08001966 if (ret) {
1967 destroy_workqueue(o2net_wq);
1968 o2net_wq = NULL;
1969 } else
1970 o2quo_conn_up(node->nd_num);
1971
1972 return ret;
1973}
1974
1975/* again, o2nm_this_node() doesn't work here as we're involved in
1976 * tearing it down */
1977void o2net_stop_listening(struct o2nm_node *node)
1978{
1979 struct socket *sock = o2net_listen_sock;
1980 size_t i;
1981
1982 BUG_ON(o2net_wq == NULL);
1983 BUG_ON(o2net_listen_sock == NULL);
1984
1985 /* stop the listening socket from generating work */
1986 write_lock_bh(&sock->sk->sk_callback_lock);
1987 sock->sk->sk_data_ready = sock->sk->sk_user_data;
1988 sock->sk->sk_user_data = NULL;
1989 write_unlock_bh(&sock->sk->sk_callback_lock);
1990
1991 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
1992 struct o2nm_node *node = o2nm_get_node_by_num(i);
1993 if (node) {
1994 o2net_disconnect_node(node);
1995 o2nm_node_put(node);
1996 }
1997 }
1998
1999 /* finish all work and tear down the work queue */
2000 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2001 destroy_workqueue(o2net_wq);
2002 o2net_wq = NULL;
2003
2004 sock_release(o2net_listen_sock);
2005 o2net_listen_sock = NULL;
2006
2007 o2quo_conn_err(node->nd_num);
2008}
2009
2010/* ------------------------------------------------------------ */
2011
2012int o2net_init(void)
2013{
2014 unsigned long i;
2015
2016 o2quo_init();
2017
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002018 if (o2net_debugfs_init())
2019 return -ENOMEM;
2020
Robert P. J. Daycd861282006-12-13 00:34:52 -08002021 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2022 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2023 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
Zach Brown98211482005-12-15 14:31:23 -08002024 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) {
2025 kfree(o2net_hand);
2026 kfree(o2net_keep_req);
2027 kfree(o2net_keep_resp);
2028 return -ENOMEM;
2029 }
2030
2031 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2032 o2net_hand->connector_id = cpu_to_be64(1);
2033
2034 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2035 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2036
2037 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2038 struct o2net_node *nn = o2net_nn_from_num(i);
2039
Tao Ma5cc3bf22008-03-05 15:50:12 +08002040 atomic_set(&nn->nn_timeout, 0);
Zach Brown98211482005-12-15 14:31:23 -08002041 spin_lock_init(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00002042 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2043 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2044 o2net_connect_expired);
2045 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
Zach Brown98211482005-12-15 14:31:23 -08002046 /* until we see hb from a node we'll return einval */
2047 nn->nn_persistent_error = -ENOTCONN;
2048 init_waitqueue_head(&nn->nn_sc_wq);
2049 idr_init(&nn->nn_status_idr);
2050 INIT_LIST_HEAD(&nn->nn_status_list);
2051 }
2052
2053 return 0;
2054}
2055
2056void o2net_exit(void)
2057{
2058 o2quo_exit();
2059 kfree(o2net_hand);
2060 kfree(o2net_keep_req);
2061 kfree(o2net_keep_resp);
Sunil Mushran2309e9e2008-04-14 10:46:19 -07002062 o2net_debugfs_exit();
Zach Brown98211482005-12-15 14:31:23 -08002063}