1 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
5 * Copyright (C) 2004 Oracle. All rights reserved.
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.
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.
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.
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.
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
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
41 * Any framing errors (bad magic, large payload lengths) close a connection.
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.
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.
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>
61 #include <linux/net.h>
64 #include <asm/uaccess.h>
66 #include "heartbeat.h"
68 #include "nodemanager.h"
69 #define MLOG_MASK_PREFIX ML_TCP
73 #include "tcp_internal.h"
75 #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
76 #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
77 &sc->sc_node->nd_ipv4_address, \
78 ntohs(sc->sc_node->nd_ipv4_port)
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.
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); \
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 , \
104 static DEFINE_RWLOCK(o2net_handler_lock);
105 static struct rb_root o2net_handler_tree = RB_ROOT;
107 static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
109 /* XXX someday we'll need better accounting */
110 static struct socket *o2net_listen_sock = NULL;
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.
120 static struct workqueue_struct *o2net_wq;
121 static struct work_struct o2net_listen_work;
123 static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
124 #define O2NET_HB_PRI 0x1
126 static struct o2net_handshake *o2net_hand;
127 static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
129 static int o2net_sys_err_translations[O2NET_ERR_MAX] =
130 {[O2NET_ERR_NONE] = 0,
131 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
132 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
133 [O2NET_ERR_DIED] = -EHOSTDOWN,};
135 /* can't quite avoid *all* internal declarations :/ */
136 static void o2net_sc_connect_completed(struct work_struct *work);
137 static void o2net_rx_until_empty(struct work_struct *work);
138 static void o2net_shutdown_sc(struct work_struct *work);
139 static void o2net_listen_data_ready(struct sock *sk, int bytes);
140 static void o2net_sc_send_keep_req(struct work_struct *work);
141 static void o2net_idle_timer(unsigned long data);
142 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
143 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
145 #ifdef CONFIG_DEBUG_FS
146 static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
147 u32 msgkey, struct task_struct *task, u8 node)
149 INIT_LIST_HEAD(&nst->st_net_debug_item);
151 nst->st_msg_type = msgtype;
152 nst->st_msg_key = msgkey;
156 static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
158 nst->st_sock_time = ktime_get();
161 static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
163 nst->st_send_time = ktime_get();
166 static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
168 nst->st_status_time = ktime_get();
171 static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
172 struct o2net_sock_container *sc)
177 static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
183 static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
185 sc->sc_tv_timer = ktime_get();
188 static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
190 sc->sc_tv_data_ready = ktime_get();
193 static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
195 sc->sc_tv_advance_start = ktime_get();
198 static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
200 sc->sc_tv_advance_stop = ktime_get();
203 static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
205 sc->sc_tv_func_start = ktime_get();
208 static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
210 sc->sc_tv_func_stop = ktime_get();
212 #else /* CONFIG_DEBUG_FS */
213 # define o2net_init_nst(a, b, c, d, e)
214 # define o2net_set_nst_sock_time(a)
215 # define o2net_set_nst_send_time(a)
216 # define o2net_set_nst_status_time(a)
217 # define o2net_set_nst_sock_container(a, b)
218 # define o2net_set_nst_msg_id(a, b)
219 # define o2net_set_sock_timer(a)
220 # define o2net_set_data_ready_time(a)
221 # define o2net_set_advance_start_time(a)
222 # define o2net_set_advance_stop_time(a)
223 # define o2net_set_func_start_time(a)
224 # define o2net_set_func_stop_time(a)
225 #endif /* CONFIG_DEBUG_FS */
227 #ifdef CONFIG_OCFS2_FS_STATS
228 static void o2net_update_send_stats(struct o2net_send_tracking *nst,
229 struct o2net_sock_container *sc)
231 sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
232 ktime_sub(ktime_get(),
233 nst->st_status_time));
234 sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
235 ktime_sub(nst->st_status_time,
237 sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
238 ktime_sub(nst->st_send_time,
245 # define o2net_update_send_stats(a, b)
247 #endif /* CONFIG_OCFS2_FS_STATS */
249 static inline int o2net_reconnect_delay(void)
251 return o2nm_single_cluster->cl_reconnect_delay_ms;
254 static inline int o2net_keepalive_delay(void)
256 return o2nm_single_cluster->cl_keepalive_delay_ms;
259 static inline int o2net_idle_timeout(void)
261 return o2nm_single_cluster->cl_idle_timeout_ms;
264 static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
267 BUG_ON(err >= O2NET_ERR_MAX);
268 trans = o2net_sys_err_translations[err];
270 /* Just in case we mess up the translation table above */
271 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
275 static struct o2net_node * o2net_nn_from_num(u8 node_num)
277 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
278 return &o2net_nodes[node_num];
281 static u8 o2net_num_from_nn(struct o2net_node *nn)
284 return nn - o2net_nodes;
287 /* ------------------------------------------------------------ */
289 static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
294 if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) {
298 spin_lock(&nn->nn_lock);
299 ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id);
301 list_add_tail(&nsw->ns_node_item,
302 &nn->nn_status_list);
303 spin_unlock(&nn->nn_lock);
304 } while (ret == -EAGAIN);
307 init_waitqueue_head(&nsw->ns_wq);
308 nsw->ns_sys_status = O2NET_ERR_NONE;
315 static void o2net_complete_nsw_locked(struct o2net_node *nn,
316 struct o2net_status_wait *nsw,
317 enum o2net_system_error sys_status,
320 assert_spin_locked(&nn->nn_lock);
322 if (!list_empty(&nsw->ns_node_item)) {
323 list_del_init(&nsw->ns_node_item);
324 nsw->ns_sys_status = sys_status;
325 nsw->ns_status = status;
326 idr_remove(&nn->nn_status_idr, nsw->ns_id);
327 wake_up(&nsw->ns_wq);
331 static void o2net_complete_nsw(struct o2net_node *nn,
332 struct o2net_status_wait *nsw,
333 u64 id, enum o2net_system_error sys_status,
336 spin_lock(&nn->nn_lock);
341 nsw = idr_find(&nn->nn_status_idr, id);
346 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
349 spin_unlock(&nn->nn_lock);
353 static void o2net_complete_nodes_nsw(struct o2net_node *nn)
355 struct o2net_status_wait *nsw, *tmp;
356 unsigned int num_kills = 0;
358 assert_spin_locked(&nn->nn_lock);
360 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
361 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
365 mlog(0, "completed %d messages for node %u\n", num_kills,
366 o2net_num_from_nn(nn));
369 static int o2net_nsw_completed(struct o2net_node *nn,
370 struct o2net_status_wait *nsw)
373 spin_lock(&nn->nn_lock);
374 completed = list_empty(&nsw->ns_node_item);
375 spin_unlock(&nn->nn_lock);
379 /* ------------------------------------------------------------ */
381 static void sc_kref_release(struct kref *kref)
383 struct o2net_sock_container *sc = container_of(kref,
384 struct o2net_sock_container, sc_kref);
385 BUG_ON(timer_pending(&sc->sc_idle_timeout));
387 sclog(sc, "releasing\n");
390 sock_release(sc->sc_sock);
394 o2nm_undepend_item(&sc->sc_node->nd_item);
395 o2nm_node_put(sc->sc_node);
398 o2net_debug_del_sc(sc);
402 static void sc_put(struct o2net_sock_container *sc)
405 kref_put(&sc->sc_kref, sc_kref_release);
407 static void sc_get(struct o2net_sock_container *sc)
410 kref_get(&sc->sc_kref);
412 static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
414 struct o2net_sock_container *sc, *ret = NULL;
415 struct page *page = NULL;
418 page = alloc_page(GFP_NOFS);
419 sc = kzalloc(sizeof(*sc), GFP_NOFS);
420 if (sc == NULL || page == NULL)
423 kref_init(&sc->sc_kref);
427 /* pin the node item of the remote node */
428 status = o2nm_depend_item(&node->nd_item);
434 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
435 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
436 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
437 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
439 init_timer(&sc->sc_idle_timeout);
440 sc->sc_idle_timeout.function = o2net_idle_timer;
441 sc->sc_idle_timeout.data = (unsigned long)sc;
443 sclog(sc, "alloced\n");
447 o2net_debug_add_sc(sc);
459 /* ------------------------------------------------------------ */
461 static void o2net_sc_queue_work(struct o2net_sock_container *sc,
462 struct work_struct *work)
465 if (!queue_work(o2net_wq, work))
468 static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
469 struct delayed_work *work,
473 if (!queue_delayed_work(o2net_wq, work, delay))
476 static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
477 struct delayed_work *work)
479 if (cancel_delayed_work(work))
483 static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
485 int o2net_num_connected_peers(void)
487 return atomic_read(&o2net_connected_peers);
490 static void o2net_set_nn_state(struct o2net_node *nn,
491 struct o2net_sock_container *sc,
492 unsigned valid, int err)
494 int was_valid = nn->nn_sc_valid;
495 int was_err = nn->nn_persistent_error;
496 struct o2net_sock_container *old_sc = nn->nn_sc;
498 assert_spin_locked(&nn->nn_lock);
501 atomic_dec(&o2net_connected_peers);
502 else if (!old_sc && sc)
503 atomic_inc(&o2net_connected_peers);
505 /* the node num comparison and single connect/accept path should stop
506 * an non-null sc from being overwritten with another */
507 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
508 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
509 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
511 if (was_valid && !valid && err == 0)
514 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
515 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
516 nn->nn_persistent_error, err);
519 nn->nn_sc_valid = valid ? 1 : 0;
520 nn->nn_persistent_error = err;
522 /* mirrors o2net_tx_can_proceed() */
523 if (nn->nn_persistent_error || nn->nn_sc_valid)
524 wake_up(&nn->nn_sc_wq);
526 if (!was_err && nn->nn_persistent_error) {
527 o2quo_conn_err(o2net_num_from_nn(nn));
528 queue_delayed_work(o2net_wq, &nn->nn_still_up,
529 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
532 if (was_valid && !valid) {
533 printk(KERN_NOTICE "o2net: no longer connected to "
534 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
535 o2net_complete_nodes_nsw(nn);
538 if (!was_valid && valid) {
539 o2quo_conn_up(o2net_num_from_nn(nn));
540 cancel_delayed_work(&nn->nn_connect_expired);
541 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
542 o2nm_this_node() > sc->sc_node->nd_num ?
543 "connected to" : "accepted connection from",
547 /* trigger the connecting worker func as long as we're not valid,
548 * it will back off if it shouldn't connect. This can be called
549 * from node config teardown and so needs to be careful about
550 * the work queue actually being up. */
551 if (!valid && o2net_wq) {
553 /* delay if we're withing a RECONNECT_DELAY of the
555 delay = (nn->nn_last_connect_attempt +
556 msecs_to_jiffies(o2net_reconnect_delay()))
558 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
560 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
561 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
564 * Delay the expired work after idle timeout.
566 * We might have lots of failed connection attempts that run
567 * through here but we only cancel the connect_expired work when
568 * a connection attempt succeeds. So only the first enqueue of
569 * the connect_expired work will do anything. The rest will see
570 * that it's already queued and do nothing.
572 delay += msecs_to_jiffies(o2net_idle_timeout());
573 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
576 /* keep track of the nn's sc ref for the caller */
577 if ((old_sc == NULL) && sc)
579 if (old_sc && (old_sc != sc)) {
580 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
585 /* see o2net_register_callbacks() */
586 static void o2net_data_ready(struct sock *sk, int bytes)
588 void (*ready)(struct sock *sk, int bytes);
590 read_lock(&sk->sk_callback_lock);
591 if (sk->sk_user_data) {
592 struct o2net_sock_container *sc = sk->sk_user_data;
593 sclog(sc, "data_ready hit\n");
594 o2net_set_data_ready_time(sc);
595 o2net_sc_queue_work(sc, &sc->sc_rx_work);
596 ready = sc->sc_data_ready;
598 ready = sk->sk_data_ready;
600 read_unlock(&sk->sk_callback_lock);
605 /* see o2net_register_callbacks() */
606 static void o2net_state_change(struct sock *sk)
608 void (*state_change)(struct sock *sk);
609 struct o2net_sock_container *sc;
611 read_lock(&sk->sk_callback_lock);
612 sc = sk->sk_user_data;
614 state_change = sk->sk_state_change;
618 sclog(sc, "state_change to %d\n", sk->sk_state);
620 state_change = sc->sc_state_change;
622 switch(sk->sk_state) {
623 /* ignore connecting sockets as they make progress */
627 case TCP_ESTABLISHED:
628 o2net_sc_queue_work(sc, &sc->sc_connect_work);
631 printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT
632 " shutdown, state %d\n",
633 SC_NODEF_ARGS(sc), sk->sk_state);
634 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
638 read_unlock(&sk->sk_callback_lock);
643 * we register callbacks so we can queue work on events before calling
644 * the original callbacks. our callbacks our careful to test user_data
645 * to discover when they've reaced with o2net_unregister_callbacks().
647 static void o2net_register_callbacks(struct sock *sk,
648 struct o2net_sock_container *sc)
650 write_lock_bh(&sk->sk_callback_lock);
652 /* accepted sockets inherit the old listen socket data ready */
653 if (sk->sk_data_ready == o2net_listen_data_ready) {
654 sk->sk_data_ready = sk->sk_user_data;
655 sk->sk_user_data = NULL;
658 BUG_ON(sk->sk_user_data != NULL);
659 sk->sk_user_data = sc;
662 sc->sc_data_ready = sk->sk_data_ready;
663 sc->sc_state_change = sk->sk_state_change;
664 sk->sk_data_ready = o2net_data_ready;
665 sk->sk_state_change = o2net_state_change;
667 mutex_init(&sc->sc_send_lock);
669 write_unlock_bh(&sk->sk_callback_lock);
672 static int o2net_unregister_callbacks(struct sock *sk,
673 struct o2net_sock_container *sc)
677 write_lock_bh(&sk->sk_callback_lock);
678 if (sk->sk_user_data == sc) {
680 sk->sk_user_data = NULL;
681 sk->sk_data_ready = sc->sc_data_ready;
682 sk->sk_state_change = sc->sc_state_change;
684 write_unlock_bh(&sk->sk_callback_lock);
690 * this is a little helper that is called by callers who have seen a problem
691 * with an sc and want to detach it from the nn if someone already hasn't beat
692 * them to it. if an error is given then the shutdown will be persistent
693 * and pending transmits will be canceled.
695 static void o2net_ensure_shutdown(struct o2net_node *nn,
696 struct o2net_sock_container *sc,
699 spin_lock(&nn->nn_lock);
701 o2net_set_nn_state(nn, NULL, 0, err);
702 spin_unlock(&nn->nn_lock);
706 * This work queue function performs the blocking parts of socket shutdown. A
707 * few paths lead here. set_nn_state will trigger this callback if it sees an
708 * sc detached from the nn. state_change will also trigger this callback
709 * directly when it sees errors. In that case we need to call set_nn_state
710 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
713 static void o2net_shutdown_sc(struct work_struct *work)
715 struct o2net_sock_container *sc =
716 container_of(work, struct o2net_sock_container,
718 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
720 sclog(sc, "shutting down\n");
722 /* drop the callbacks ref and call shutdown only once */
723 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
724 /* we shouldn't flush as we're in the thread, the
725 * races with pending sc work structs are harmless */
726 del_timer_sync(&sc->sc_idle_timeout);
727 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
729 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
732 /* not fatal so failed connects before the other guy has our
733 * heartbeat can be retried */
734 o2net_ensure_shutdown(nn, sc, 0);
738 /* ------------------------------------------------------------ */
740 static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
743 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
746 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
751 static struct o2net_msg_handler *
752 o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
753 struct rb_node **ret_parent)
755 struct rb_node **p = &o2net_handler_tree.rb_node;
756 struct rb_node *parent = NULL;
757 struct o2net_msg_handler *nmh, *ret = NULL;
762 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
763 cmp = o2net_handler_cmp(nmh, msg_type, key);
777 if (ret_parent != NULL)
778 *ret_parent = parent;
783 static void o2net_handler_kref_release(struct kref *kref)
785 struct o2net_msg_handler *nmh;
786 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
791 static void o2net_handler_put(struct o2net_msg_handler *nmh)
793 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
796 /* max_len is protection for the handler func. incoming messages won't
797 * be given to the handler if their payload is longer than the max. */
798 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
799 o2net_msg_handler_func *func, void *data,
800 o2net_post_msg_handler_func *post_func,
801 struct list_head *unreg_list)
803 struct o2net_msg_handler *nmh = NULL;
804 struct rb_node **p, *parent;
807 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
808 mlog(0, "max_len for message handler out of range: %u\n",
815 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
821 mlog(0, "no message handler provided: %u, %p\n",
827 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
834 nmh->nh_func_data = data;
835 nmh->nh_post_func = post_func;
836 nmh->nh_msg_type = msg_type;
837 nmh->nh_max_len = max_len;
839 /* the tree and list get this ref.. they're both removed in
840 * unregister when this ref is dropped */
841 kref_init(&nmh->nh_kref);
842 INIT_LIST_HEAD(&nmh->nh_unregister_item);
844 write_lock(&o2net_handler_lock);
845 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
848 rb_link_node(&nmh->nh_node, parent, p);
849 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
850 list_add_tail(&nmh->nh_unregister_item, unreg_list);
852 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
853 func, msg_type, key);
854 /* we've had some trouble with handlers seemingly vanishing. */
855 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
857 "couldn't find handler we *just* registerd "
858 "for type %u key %08x\n", msg_type, key);
860 write_unlock(&o2net_handler_lock);
870 EXPORT_SYMBOL_GPL(o2net_register_handler);
872 void o2net_unregister_handler_list(struct list_head *list)
874 struct o2net_msg_handler *nmh, *n;
876 write_lock(&o2net_handler_lock);
877 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
878 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
879 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
880 rb_erase(&nmh->nh_node, &o2net_handler_tree);
881 list_del_init(&nmh->nh_unregister_item);
882 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
884 write_unlock(&o2net_handler_lock);
886 EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
888 static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
890 struct o2net_msg_handler *nmh;
892 read_lock(&o2net_handler_lock);
893 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
895 kref_get(&nmh->nh_kref);
896 read_unlock(&o2net_handler_lock);
901 /* ------------------------------------------------------------ */
903 static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
911 struct msghdr msg = {
913 .msg_iov = (struct iovec *)&vec,
914 .msg_flags = MSG_DONTWAIT,
919 ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
925 static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
926 size_t veclen, size_t total)
930 struct msghdr msg = {
931 .msg_iov = (struct iovec *)vec,
932 .msg_iovlen = veclen,
942 ret = sock_sendmsg(sock, &msg, total);
945 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
948 ret = -EPIPE; /* should be smarter, I bet */
955 mlog(0, "returning error: %d\n", ret);
959 static void o2net_sendpage(struct o2net_sock_container *sc,
960 void *kmalloced_virt,
963 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
967 mutex_lock(&sc->sc_send_lock);
968 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
969 virt_to_page(kmalloced_virt),
970 (long)kmalloced_virt & ~PAGE_MASK,
972 mutex_unlock(&sc->sc_send_lock);
975 if (ret == (ssize_t)-EAGAIN) {
976 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
977 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
981 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
982 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
983 o2net_ensure_shutdown(nn, sc, 0);
988 static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
990 memset(msg, 0, sizeof(struct o2net_msg));
991 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
992 msg->data_len = cpu_to_be16(data_len);
993 msg->msg_type = cpu_to_be16(msg_type);
994 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
996 msg->key = cpu_to_be32(key);
999 static int o2net_tx_can_proceed(struct o2net_node *nn,
1000 struct o2net_sock_container **sc_ret,
1005 spin_lock(&nn->nn_lock);
1006 if (nn->nn_persistent_error) {
1009 *error = nn->nn_persistent_error;
1010 } else if (nn->nn_sc_valid) {
1011 kref_get(&nn->nn_sc->sc_kref);
1014 *sc_ret = nn->nn_sc;
1017 spin_unlock(&nn->nn_lock);
1022 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1023 size_t caller_veclen, u8 target_node, int *status)
1026 struct o2net_msg *msg = NULL;
1027 size_t veclen, caller_bytes = 0;
1028 struct kvec *vec = NULL;
1029 struct o2net_sock_container *sc = NULL;
1030 struct o2net_node *nn = o2net_nn_from_num(target_node);
1031 struct o2net_status_wait nsw = {
1032 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
1034 struct o2net_send_tracking nst;
1036 o2net_init_nst(&nst, msg_type, key, current, target_node);
1038 if (o2net_wq == NULL) {
1039 mlog(0, "attempt to tx without o2netd running\n");
1044 if (caller_veclen == 0) {
1045 mlog(0, "bad kvec array length\n");
1050 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1051 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1052 mlog(0, "total payload len %zu too large\n", caller_bytes);
1057 if (target_node == o2nm_this_node()) {
1062 o2net_debug_add_nst(&nst);
1064 o2net_set_nst_sock_time(&nst);
1066 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
1070 o2net_set_nst_sock_container(&nst, sc);
1072 veclen = caller_veclen + 1;
1073 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
1075 mlog(0, "failed to %zu element kvec!\n", veclen);
1080 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1082 mlog(0, "failed to allocate a o2net_msg!\n");
1087 o2net_init_msg(msg, caller_bytes, msg_type, key);
1089 vec[0].iov_len = sizeof(struct o2net_msg);
1090 vec[0].iov_base = msg;
1091 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1093 ret = o2net_prep_nsw(nn, &nsw);
1097 msg->msg_num = cpu_to_be32(nsw.ns_id);
1098 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1100 o2net_set_nst_send_time(&nst);
1102 /* finally, convert the message header to network byte-order
1104 mutex_lock(&sc->sc_send_lock);
1105 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1106 sizeof(struct o2net_msg) + caller_bytes);
1107 mutex_unlock(&sc->sc_send_lock);
1108 msglog(msg, "sending returned %d\n", ret);
1110 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1114 /* wait on other node's handler */
1115 o2net_set_nst_status_time(&nst);
1116 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1118 o2net_update_send_stats(&nst, sc);
1120 /* Note that we avoid overwriting the callers status return
1121 * variable if a system error was reported on the other
1122 * side. Callers beware. */
1123 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1125 *status = nsw.ns_status;
1127 mlog(0, "woken, returning system status %d, user status %d\n",
1128 ret, nsw.ns_status);
1130 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
1137 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1140 EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1142 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1143 u8 target_node, int *status)
1149 return o2net_send_message_vec(msg_type, key, &vec, 1,
1150 target_node, status);
1152 EXPORT_SYMBOL_GPL(o2net_send_message);
1154 static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1155 enum o2net_system_error syserr, int err)
1159 .iov_len = sizeof(struct o2net_msg),
1162 BUG_ON(syserr >= O2NET_ERR_MAX);
1164 /* leave other fields intact from the incoming message, msg_num
1166 hdr->sys_status = cpu_to_be32(syserr);
1167 hdr->status = cpu_to_be32(err);
1168 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1171 msglog(hdr, "about to send status magic %d\n", err);
1172 /* hdr has been in host byteorder this whole time */
1173 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1176 /* this returns -errno if the header was unknown or too large, etc.
1177 * after this is called the buffer us reused for the next message */
1178 static int o2net_process_message(struct o2net_sock_container *sc,
1179 struct o2net_msg *hdr)
1181 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1182 int ret = 0, handler_status;
1183 enum o2net_system_error syserr;
1184 struct o2net_msg_handler *nmh = NULL;
1185 void *ret_data = NULL;
1187 msglog(hdr, "processing message\n");
1189 o2net_sc_postpone_idle(sc);
1191 switch(be16_to_cpu(hdr->magic)) {
1192 case O2NET_MSG_STATUS_MAGIC:
1193 /* special type for returning message status */
1194 o2net_complete_nsw(nn, NULL,
1195 be32_to_cpu(hdr->msg_num),
1196 be32_to_cpu(hdr->sys_status),
1197 be32_to_cpu(hdr->status));
1199 case O2NET_MSG_KEEP_REQ_MAGIC:
1200 o2net_sendpage(sc, o2net_keep_resp,
1201 sizeof(*o2net_keep_resp));
1203 case O2NET_MSG_KEEP_RESP_MAGIC:
1205 case O2NET_MSG_MAGIC:
1208 msglog(hdr, "bad magic\n");
1214 /* find a handler for it */
1216 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1217 be32_to_cpu(hdr->key));
1219 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1220 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1221 syserr = O2NET_ERR_NO_HNDLR;
1225 syserr = O2NET_ERR_NONE;
1227 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1228 syserr = O2NET_ERR_OVERFLOW;
1230 if (syserr != O2NET_ERR_NONE)
1233 o2net_set_func_start_time(sc);
1234 sc->sc_msg_key = be32_to_cpu(hdr->key);
1235 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1236 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1237 be16_to_cpu(hdr->data_len),
1238 nmh->nh_func_data, &ret_data);
1239 o2net_set_func_stop_time(sc);
1242 /* this destroys the hdr, so don't use it after this */
1243 mutex_lock(&sc->sc_send_lock);
1244 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1246 mutex_unlock(&sc->sc_send_lock);
1248 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1249 handler_status, syserr, ret);
1252 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1253 if (nmh->nh_post_func)
1254 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1260 o2net_handler_put(nmh);
1264 static int o2net_check_handshake(struct o2net_sock_container *sc)
1266 struct o2net_handshake *hand = page_address(sc->sc_page);
1267 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1269 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1270 mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol "
1271 "version %llu but %llu is required, disconnecting\n",
1273 (unsigned long long)be64_to_cpu(hand->protocol_version),
1274 O2NET_PROTOCOL_VERSION);
1276 /* don't bother reconnecting if its the wrong version. */
1277 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1282 * Ensure timeouts are consistent with other nodes, otherwise
1283 * we can end up with one node thinking that the other must be down,
1284 * but isn't. This can ultimately cause corruption.
1286 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
1287 o2net_idle_timeout()) {
1288 mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of "
1289 "%u ms, but we use %u ms locally. disconnecting\n",
1291 be32_to_cpu(hand->o2net_idle_timeout_ms),
1292 o2net_idle_timeout());
1293 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1297 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
1298 o2net_keepalive_delay()) {
1299 mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of "
1300 "%u ms, but we use %u ms locally. disconnecting\n",
1302 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1303 o2net_keepalive_delay());
1304 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1308 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1309 O2HB_MAX_WRITE_TIMEOUT_MS) {
1310 mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of "
1311 "%u ms, but we use %u ms locally. disconnecting\n",
1313 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1314 O2HB_MAX_WRITE_TIMEOUT_MS);
1315 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1319 sc->sc_handshake_ok = 1;
1321 spin_lock(&nn->nn_lock);
1322 /* set valid and queue the idle timers only if it hasn't been
1323 * shut down already */
1324 if (nn->nn_sc == sc) {
1325 o2net_sc_reset_idle_timer(sc);
1326 atomic_set(&nn->nn_timeout, 0);
1327 o2net_set_nn_state(nn, sc, 1, 0);
1329 spin_unlock(&nn->nn_lock);
1331 /* shift everything up as though it wasn't there */
1332 sc->sc_page_off -= sizeof(struct o2net_handshake);
1333 if (sc->sc_page_off)
1334 memmove(hand, hand + 1, sc->sc_page_off);
1339 /* this demuxes the queued rx bytes into header or payload bits and calls
1340 * handlers as each full message is read off the socket. it returns -error,
1341 * == 0 eof, or > 0 for progress made.*/
1342 static int o2net_advance_rx(struct o2net_sock_container *sc)
1344 struct o2net_msg *hdr;
1349 sclog(sc, "receiving\n");
1350 o2net_set_advance_start_time(sc);
1352 if (unlikely(sc->sc_handshake_ok == 0)) {
1353 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1354 data = page_address(sc->sc_page) + sc->sc_page_off;
1355 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1356 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1358 sc->sc_page_off += ret;
1361 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1362 o2net_check_handshake(sc);
1363 if (unlikely(sc->sc_handshake_ok == 0))
1369 /* do we need more header? */
1370 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1371 data = page_address(sc->sc_page) + sc->sc_page_off;
1372 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1373 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1375 sc->sc_page_off += ret;
1376 /* only swab incoming here.. we can
1377 * only get here once as we cross from
1378 * being under to over */
1379 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1380 hdr = page_address(sc->sc_page);
1381 if (be16_to_cpu(hdr->data_len) >
1382 O2NET_MAX_PAYLOAD_BYTES)
1390 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1391 /* oof, still don't have a header */
1395 /* this was swabbed above when we first read it */
1396 hdr = page_address(sc->sc_page);
1398 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1400 /* do we need more payload? */
1401 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1402 /* need more payload */
1403 data = page_address(sc->sc_page) + sc->sc_page_off;
1404 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1406 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1408 sc->sc_page_off += ret;
1413 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1414 /* we can only get here once, the first time we read
1415 * the payload.. so set ret to progress if the handler
1416 * works out. after calling this the message is toast */
1417 ret = o2net_process_message(sc, hdr);
1420 sc->sc_page_off = 0;
1424 sclog(sc, "ret = %d\n", ret);
1425 o2net_set_advance_stop_time(sc);
1429 /* this work func is triggerd by data ready. it reads until it can read no
1430 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1431 * our work the work struct will be marked and we'll be called again. */
1432 static void o2net_rx_until_empty(struct work_struct *work)
1434 struct o2net_sock_container *sc =
1435 container_of(work, struct o2net_sock_container, sc_rx_work);
1439 ret = o2net_advance_rx(sc);
1442 if (ret <= 0 && ret != -EAGAIN) {
1443 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1444 sclog(sc, "saw error %d, closing\n", ret);
1445 /* not permanent so read failed handshake can retry */
1446 o2net_ensure_shutdown(nn, sc, 0);
1452 static int o2net_set_nodelay(struct socket *sock)
1461 * Dear unsuspecting programmer,
1463 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1464 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1465 * silently turn into SO_DEBUG.
1468 * Keeper of hilariously fragile interfaces.
1470 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1471 (char __user *)&val, sizeof(val));
1477 static void o2net_initialize_handshake(void)
1479 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1480 O2HB_MAX_WRITE_TIMEOUT_MS);
1481 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
1482 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
1483 o2net_keepalive_delay());
1484 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
1485 o2net_reconnect_delay());
1488 /* ------------------------------------------------------------ */
1490 /* called when a connect completes and after a sock is accepted. the
1491 * rx path will see the response and mark the sc valid */
1492 static void o2net_sc_connect_completed(struct work_struct *work)
1494 struct o2net_sock_container *sc =
1495 container_of(work, struct o2net_sock_container,
1498 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1499 (unsigned long long)O2NET_PROTOCOL_VERSION,
1500 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1502 o2net_initialize_handshake();
1503 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1507 /* this is called as a work_struct func. */
1508 static void o2net_sc_send_keep_req(struct work_struct *work)
1510 struct o2net_sock_container *sc =
1511 container_of(work, struct o2net_sock_container,
1512 sc_keepalive_work.work);
1514 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1518 /* socket shutdown does a del_timer_sync against this as it tears down.
1519 * we can't start this timer until we've got to the point in sc buildup
1520 * where shutdown is going to be involved */
1521 static void o2net_idle_timer(unsigned long data)
1523 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
1524 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1526 #ifdef CONFIG_DEBUG_FS
1527 ktime_t now = ktime_get();
1530 printk(KERN_NOTICE "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u "
1531 "seconds, shutting it down.\n", SC_NODEF_ARGS(sc),
1532 o2net_idle_timeout() / 1000,
1533 o2net_idle_timeout() % 1000);
1535 #ifdef CONFIG_DEBUG_FS
1536 mlog(ML_NOTICE, "Here are some times that might help debug the "
1537 "situation: (Timer: %lld, Now %lld, DataReady %lld, Advance %lld-%lld, "
1538 "Key 0x%08x, Func %u, FuncTime %lld-%lld)\n",
1539 (long long)ktime_to_us(sc->sc_tv_timer), (long long)ktime_to_us(now),
1540 (long long)ktime_to_us(sc->sc_tv_data_ready),
1541 (long long)ktime_to_us(sc->sc_tv_advance_start),
1542 (long long)ktime_to_us(sc->sc_tv_advance_stop),
1543 sc->sc_msg_key, sc->sc_msg_type,
1544 (long long)ktime_to_us(sc->sc_tv_func_start),
1545 (long long)ktime_to_us(sc->sc_tv_func_stop));
1549 * Initialize the nn_timeout so that the next connection attempt
1550 * will continue in o2net_start_connect.
1552 atomic_set(&nn->nn_timeout, 1);
1554 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
1557 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
1559 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1560 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
1561 msecs_to_jiffies(o2net_keepalive_delay()));
1562 o2net_set_sock_timer(sc);
1563 mod_timer(&sc->sc_idle_timeout,
1564 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
1567 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1569 /* Only push out an existing timer */
1570 if (timer_pending(&sc->sc_idle_timeout))
1571 o2net_sc_reset_idle_timer(sc);
1574 /* this work func is kicked whenever a path sets the nn state which doesn't
1575 * have valid set. This includes seeing hb come up, losing a connection,
1576 * having a connect attempt fail, etc. This centralizes the logic which decides
1577 * if a connect attempt should be made or if we should give up and all future
1578 * transmit attempts should fail */
1579 static void o2net_start_connect(struct work_struct *work)
1581 struct o2net_node *nn =
1582 container_of(work, struct o2net_node, nn_connect_work.work);
1583 struct o2net_sock_container *sc = NULL;
1584 struct o2nm_node *node = NULL, *mynode = NULL;
1585 struct socket *sock = NULL;
1586 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
1588 unsigned int timeout;
1590 /* if we're greater we initiate tx, otherwise we accept */
1591 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1594 /* watch for racing with tearing a node down */
1595 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1601 mynode = o2nm_get_node_by_num(o2nm_this_node());
1602 if (mynode == NULL) {
1607 spin_lock(&nn->nn_lock);
1609 * see if we already have one pending or have given up.
1610 * For nn_timeout, it is set when we close the connection
1611 * because of the idle time out. So it means that we have
1612 * at least connected to that node successfully once,
1613 * now try to connect to it again.
1615 timeout = atomic_read(&nn->nn_timeout);
1616 stop = (nn->nn_sc ||
1617 (nn->nn_persistent_error &&
1618 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
1619 spin_unlock(&nn->nn_lock);
1623 nn->nn_last_connect_attempt = jiffies;
1625 sc = sc_alloc(node);
1627 mlog(0, "couldn't allocate sc\n");
1632 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1634 mlog(0, "can't create socket: %d\n", ret);
1637 sc->sc_sock = sock; /* freed by sc_kref_release */
1639 sock->sk->sk_allocation = GFP_ATOMIC;
1641 myaddr.sin_family = AF_INET;
1642 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
1643 myaddr.sin_port = htons(0); /* any port */
1645 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1648 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1649 ret, &mynode->nd_ipv4_address);
1653 ret = o2net_set_nodelay(sc->sc_sock);
1655 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1659 o2net_register_callbacks(sc->sc_sock->sk, sc);
1661 spin_lock(&nn->nn_lock);
1662 /* handshake completion will set nn->nn_sc_valid */
1663 o2net_set_nn_state(nn, sc, 0, 0);
1664 spin_unlock(&nn->nn_lock);
1666 remoteaddr.sin_family = AF_INET;
1667 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1668 remoteaddr.sin_port = node->nd_ipv4_port;
1670 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1671 (struct sockaddr *)&remoteaddr,
1674 if (ret == -EINPROGRESS)
1679 mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed "
1680 "with errno %d\n", SC_NODEF_ARGS(sc), ret);
1681 /* 0 err so that another will be queued and attempted
1682 * from set_nn_state */
1684 o2net_ensure_shutdown(nn, sc, 0);
1689 o2nm_node_put(node);
1691 o2nm_node_put(mynode);
1696 static void o2net_connect_expired(struct work_struct *work)
1698 struct o2net_node *nn =
1699 container_of(work, struct o2net_node, nn_connect_expired.work);
1701 spin_lock(&nn->nn_lock);
1702 if (!nn->nn_sc_valid) {
1703 mlog(ML_ERROR, "no connection established with node %u after "
1704 "%u.%u seconds, giving up and returning errors.\n",
1705 o2net_num_from_nn(nn),
1706 o2net_idle_timeout() / 1000,
1707 o2net_idle_timeout() % 1000);
1709 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1711 spin_unlock(&nn->nn_lock);
1714 static void o2net_still_up(struct work_struct *work)
1716 struct o2net_node *nn =
1717 container_of(work, struct o2net_node, nn_still_up.work);
1719 o2quo_hb_still_up(o2net_num_from_nn(nn));
1722 /* ------------------------------------------------------------ */
1724 void o2net_disconnect_node(struct o2nm_node *node)
1726 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1728 /* don't reconnect until it's heartbeating again */
1729 spin_lock(&nn->nn_lock);
1730 atomic_set(&nn->nn_timeout, 0);
1731 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1732 spin_unlock(&nn->nn_lock);
1735 cancel_delayed_work(&nn->nn_connect_expired);
1736 cancel_delayed_work(&nn->nn_connect_work);
1737 cancel_delayed_work(&nn->nn_still_up);
1738 flush_workqueue(o2net_wq);
1742 static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1745 o2quo_hb_down(node_num);
1750 if (node_num != o2nm_this_node())
1751 o2net_disconnect_node(node);
1753 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
1756 static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1759 struct o2net_node *nn = o2net_nn_from_num(node_num);
1761 o2quo_hb_up(node_num);
1765 /* ensure an immediate connect attempt */
1766 nn->nn_last_connect_attempt = jiffies -
1767 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
1769 if (node_num != o2nm_this_node()) {
1770 /* believe it or not, accept and node hearbeating testing
1771 * can succeed for this node before we got here.. so
1772 * only use set_nn_state to clear the persistent error
1773 * if that hasn't already happened */
1774 spin_lock(&nn->nn_lock);
1775 atomic_set(&nn->nn_timeout, 0);
1776 if (nn->nn_persistent_error)
1777 o2net_set_nn_state(nn, NULL, 0, 0);
1778 spin_unlock(&nn->nn_lock);
1782 void o2net_unregister_hb_callbacks(void)
1784 o2hb_unregister_callback(NULL, &o2net_hb_up);
1785 o2hb_unregister_callback(NULL, &o2net_hb_down);
1788 int o2net_register_hb_callbacks(void)
1792 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1793 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1794 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1795 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1797 ret = o2hb_register_callback(NULL, &o2net_hb_up);
1799 ret = o2hb_register_callback(NULL, &o2net_hb_down);
1802 o2net_unregister_hb_callbacks();
1807 /* ------------------------------------------------------------ */
1809 static int o2net_accept_one(struct socket *sock)
1812 struct sockaddr_in sin;
1813 struct socket *new_sock = NULL;
1814 struct o2nm_node *node = NULL;
1815 struct o2nm_node *local_node = NULL;
1816 struct o2net_sock_container *sc = NULL;
1817 struct o2net_node *nn;
1819 BUG_ON(sock == NULL);
1820 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1821 sock->sk->sk_protocol, &new_sock);
1825 new_sock->type = sock->type;
1826 new_sock->ops = sock->ops;
1827 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1831 new_sock->sk->sk_allocation = GFP_ATOMIC;
1833 ret = o2net_set_nodelay(new_sock);
1835 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1840 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1845 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
1847 mlog(ML_NOTICE, "attempt to connect from unknown node at %pI4:%d\n",
1848 &sin.sin_addr.s_addr, ntohs(sin.sin_port));
1853 if (o2nm_this_node() >= node->nd_num) {
1854 local_node = o2nm_get_node_by_num(o2nm_this_node());
1855 mlog(ML_NOTICE, "unexpected connect attempt seen at node '%s' ("
1856 "%u, %pI4:%d) from node '%s' (%u, %pI4:%d)\n",
1857 local_node->nd_name, local_node->nd_num,
1858 &(local_node->nd_ipv4_address),
1859 ntohs(local_node->nd_ipv4_port),
1860 node->nd_name, node->nd_num, &sin.sin_addr.s_addr,
1861 ntohs(sin.sin_port));
1866 /* this happens all the time when the other node sees our heartbeat
1867 * and tries to connect before we see their heartbeat */
1868 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1869 mlog(ML_CONN, "attempt to connect from node '%s' at "
1870 "%pI4:%d but it isn't heartbeating\n",
1871 node->nd_name, &sin.sin_addr.s_addr,
1872 ntohs(sin.sin_port));
1877 nn = o2net_nn_from_num(node->nd_num);
1879 spin_lock(&nn->nn_lock);
1884 spin_unlock(&nn->nn_lock);
1886 mlog(ML_NOTICE, "attempt to connect from node '%s' at "
1887 "%pI4:%d but it already has an open connection\n",
1888 node->nd_name, &sin.sin_addr.s_addr,
1889 ntohs(sin.sin_port));
1893 sc = sc_alloc(node);
1899 sc->sc_sock = new_sock;
1902 spin_lock(&nn->nn_lock);
1903 atomic_set(&nn->nn_timeout, 0);
1904 o2net_set_nn_state(nn, sc, 0, 0);
1905 spin_unlock(&nn->nn_lock);
1907 o2net_register_callbacks(sc->sc_sock->sk, sc);
1908 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1910 o2net_initialize_handshake();
1911 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1915 sock_release(new_sock);
1917 o2nm_node_put(node);
1919 o2nm_node_put(local_node);
1925 static void o2net_accept_many(struct work_struct *work)
1927 struct socket *sock = o2net_listen_sock;
1928 while (o2net_accept_one(sock) == 0)
1932 static void o2net_listen_data_ready(struct sock *sk, int bytes)
1934 void (*ready)(struct sock *sk, int bytes);
1936 read_lock(&sk->sk_callback_lock);
1937 ready = sk->sk_user_data;
1938 if (ready == NULL) { /* check for teardown race */
1939 ready = sk->sk_data_ready;
1943 /* ->sk_data_ready is also called for a newly established child socket
1944 * before it has been accepted and the acceptor has set up their
1945 * data_ready.. we only want to queue listen work for our listening
1947 if (sk->sk_state == TCP_LISTEN) {
1948 mlog(ML_TCP, "bytes: %d\n", bytes);
1949 queue_work(o2net_wq, &o2net_listen_work);
1953 read_unlock(&sk->sk_callback_lock);
1957 static int o2net_open_listening_sock(__be32 addr, __be16 port)
1959 struct socket *sock = NULL;
1961 struct sockaddr_in sin = {
1962 .sin_family = PF_INET,
1963 .sin_addr = { .s_addr = addr },
1967 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1969 mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret);
1973 sock->sk->sk_allocation = GFP_ATOMIC;
1975 write_lock_bh(&sock->sk->sk_callback_lock);
1976 sock->sk->sk_user_data = sock->sk->sk_data_ready;
1977 sock->sk->sk_data_ready = o2net_listen_data_ready;
1978 write_unlock_bh(&sock->sk->sk_callback_lock);
1980 o2net_listen_sock = sock;
1981 INIT_WORK(&o2net_listen_work, o2net_accept_many);
1983 sock->sk->sk_reuse = 1;
1984 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
1986 mlog(ML_ERROR, "unable to bind socket at %pI4:%u, "
1987 "ret=%d\n", &addr, ntohs(port), ret);
1991 ret = sock->ops->listen(sock, 64);
1993 mlog(ML_ERROR, "unable to listen on %pI4:%u, ret=%d\n",
1994 &addr, ntohs(port), ret);
1999 o2net_listen_sock = NULL;
2007 * called from node manager when we should bring up our network listening
2008 * socket. node manager handles all the serialization to only call this
2009 * once and to match it with o2net_stop_listening(). note,
2010 * o2nm_this_node() doesn't work yet as we're being called while it
2013 int o2net_start_listening(struct o2nm_node *node)
2017 BUG_ON(o2net_wq != NULL);
2018 BUG_ON(o2net_listen_sock != NULL);
2020 mlog(ML_KTHREAD, "starting o2net thread...\n");
2021 o2net_wq = create_singlethread_workqueue("o2net");
2022 if (o2net_wq == NULL) {
2023 mlog(ML_ERROR, "unable to launch o2net thread\n");
2024 return -ENOMEM; /* ? */
2027 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2028 node->nd_ipv4_port);
2030 destroy_workqueue(o2net_wq);
2033 o2quo_conn_up(node->nd_num);
2038 /* again, o2nm_this_node() doesn't work here as we're involved in
2039 * tearing it down */
2040 void o2net_stop_listening(struct o2nm_node *node)
2042 struct socket *sock = o2net_listen_sock;
2045 BUG_ON(o2net_wq == NULL);
2046 BUG_ON(o2net_listen_sock == NULL);
2048 /* stop the listening socket from generating work */
2049 write_lock_bh(&sock->sk->sk_callback_lock);
2050 sock->sk->sk_data_ready = sock->sk->sk_user_data;
2051 sock->sk->sk_user_data = NULL;
2052 write_unlock_bh(&sock->sk->sk_callback_lock);
2054 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2055 struct o2nm_node *node = o2nm_get_node_by_num(i);
2057 o2net_disconnect_node(node);
2058 o2nm_node_put(node);
2062 /* finish all work and tear down the work queue */
2063 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2064 destroy_workqueue(o2net_wq);
2067 sock_release(o2net_listen_sock);
2068 o2net_listen_sock = NULL;
2070 o2quo_conn_err(node->nd_num);
2073 /* ------------------------------------------------------------ */
2075 int o2net_init(void)
2081 if (o2net_debugfs_init())
2084 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2085 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2086 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2087 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) {
2089 kfree(o2net_keep_req);
2090 kfree(o2net_keep_resp);
2094 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2095 o2net_hand->connector_id = cpu_to_be64(1);
2097 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2098 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2100 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2101 struct o2net_node *nn = o2net_nn_from_num(i);
2103 atomic_set(&nn->nn_timeout, 0);
2104 spin_lock_init(&nn->nn_lock);
2105 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2106 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2107 o2net_connect_expired);
2108 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
2109 /* until we see hb from a node we'll return einval */
2110 nn->nn_persistent_error = -ENOTCONN;
2111 init_waitqueue_head(&nn->nn_sc_wq);
2112 idr_init(&nn->nn_status_idr);
2113 INIT_LIST_HEAD(&nn->nn_status_list);
2119 void o2net_exit(void)
2123 kfree(o2net_keep_req);
2124 kfree(o2net_keep_resp);
2125 o2net_debugfs_exit();