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>
62 #include <linux/export.h>
65 #include <asm/uaccess.h>
67 #include "heartbeat.h"
69 #include "nodemanager.h"
70 #define MLOG_MASK_PREFIX ML_TCP
74 #include "tcp_internal.h"
76 #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
77 #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
78 &sc->sc_node->nd_ipv4_address, \
79 ntohs(sc->sc_node->nd_ipv4_port)
82 * In the following two log macros, the whitespace after the ',' just
83 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
84 * previous token if args expands to nothing.
86 #define msglog(hdr, fmt, args...) do { \
87 typeof(hdr) __hdr = (hdr); \
88 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
89 "key %08x num %u] " fmt, \
90 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
91 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
92 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
93 be32_to_cpu(__hdr->msg_num) , ##args); \
96 #define sclog(sc, fmt, args...) do { \
97 typeof(sc) __sc = (sc); \
98 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
99 "pg_off %zu] " fmt, __sc, \
100 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
101 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
105 static DEFINE_RWLOCK(o2net_handler_lock);
106 static struct rb_root o2net_handler_tree = RB_ROOT;
108 static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
110 /* XXX someday we'll need better accounting */
111 static struct socket *o2net_listen_sock = NULL;
114 * listen work is only queued by the listening socket callbacks on the
115 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
116 * quorum work is queued as sock containers are shutdown.. stop_listening
117 * tears down all the node's sock containers, preventing future shutdowns
118 * and queued quroum work, before canceling delayed quorum work and
119 * destroying the work queue.
121 static struct workqueue_struct *o2net_wq;
122 static struct work_struct o2net_listen_work;
124 static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
125 #define O2NET_HB_PRI 0x1
127 static struct o2net_handshake *o2net_hand;
128 static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
130 static int o2net_sys_err_translations[O2NET_ERR_MAX] =
131 {[O2NET_ERR_NONE] = 0,
132 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
133 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
134 [O2NET_ERR_DIED] = -EHOSTDOWN,};
136 /* can't quite avoid *all* internal declarations :/ */
137 static void o2net_sc_connect_completed(struct work_struct *work);
138 static void o2net_rx_until_empty(struct work_struct *work);
139 static void o2net_shutdown_sc(struct work_struct *work);
140 static void o2net_listen_data_ready(struct sock *sk, int bytes);
141 static void o2net_sc_send_keep_req(struct work_struct *work);
142 static void o2net_idle_timer(unsigned long data);
143 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
144 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
146 #ifdef CONFIG_DEBUG_FS
147 static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
148 u32 msgkey, struct task_struct *task, u8 node)
150 INIT_LIST_HEAD(&nst->st_net_debug_item);
152 nst->st_msg_type = msgtype;
153 nst->st_msg_key = msgkey;
157 static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
159 nst->st_sock_time = ktime_get();
162 static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
164 nst->st_send_time = ktime_get();
167 static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
169 nst->st_status_time = ktime_get();
172 static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
173 struct o2net_sock_container *sc)
178 static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
184 static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
186 sc->sc_tv_timer = ktime_get();
189 static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
191 sc->sc_tv_data_ready = ktime_get();
194 static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
196 sc->sc_tv_advance_start = ktime_get();
199 static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
201 sc->sc_tv_advance_stop = ktime_get();
204 static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
206 sc->sc_tv_func_start = ktime_get();
209 static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
211 sc->sc_tv_func_stop = ktime_get();
214 #else /* CONFIG_DEBUG_FS */
215 # define o2net_init_nst(a, b, c, d, e)
216 # define o2net_set_nst_sock_time(a)
217 # define o2net_set_nst_send_time(a)
218 # define o2net_set_nst_status_time(a)
219 # define o2net_set_nst_sock_container(a, b)
220 # define o2net_set_nst_msg_id(a, b)
221 # define o2net_set_sock_timer(a)
222 # define o2net_set_data_ready_time(a)
223 # define o2net_set_advance_start_time(a)
224 # define o2net_set_advance_stop_time(a)
225 # define o2net_set_func_start_time(a)
226 # define o2net_set_func_stop_time(a)
227 #endif /* CONFIG_DEBUG_FS */
229 #ifdef CONFIG_OCFS2_FS_STATS
230 static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc)
232 return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
235 static void o2net_update_send_stats(struct o2net_send_tracking *nst,
236 struct o2net_sock_container *sc)
238 sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
239 ktime_sub(ktime_get(),
240 nst->st_status_time));
241 sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
242 ktime_sub(nst->st_status_time,
244 sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
245 ktime_sub(nst->st_send_time,
250 static void o2net_update_recv_stats(struct o2net_sock_container *sc)
252 sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
253 o2net_get_func_run_time(sc));
259 # define o2net_update_send_stats(a, b)
261 # define o2net_update_recv_stats(sc)
263 #endif /* CONFIG_OCFS2_FS_STATS */
265 static inline int o2net_reconnect_delay(void)
267 return o2nm_single_cluster->cl_reconnect_delay_ms;
270 static inline int o2net_keepalive_delay(void)
272 return o2nm_single_cluster->cl_keepalive_delay_ms;
275 static inline int o2net_idle_timeout(void)
277 return o2nm_single_cluster->cl_idle_timeout_ms;
280 static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
283 BUG_ON(err >= O2NET_ERR_MAX);
284 trans = o2net_sys_err_translations[err];
286 /* Just in case we mess up the translation table above */
287 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
291 static struct o2net_node * o2net_nn_from_num(u8 node_num)
293 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
294 return &o2net_nodes[node_num];
297 static u8 o2net_num_from_nn(struct o2net_node *nn)
300 return nn - o2net_nodes;
303 /* ------------------------------------------------------------ */
305 static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
310 if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) {
314 spin_lock(&nn->nn_lock);
315 ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id);
317 list_add_tail(&nsw->ns_node_item,
318 &nn->nn_status_list);
319 spin_unlock(&nn->nn_lock);
320 } while (ret == -EAGAIN);
323 init_waitqueue_head(&nsw->ns_wq);
324 nsw->ns_sys_status = O2NET_ERR_NONE;
331 static void o2net_complete_nsw_locked(struct o2net_node *nn,
332 struct o2net_status_wait *nsw,
333 enum o2net_system_error sys_status,
336 assert_spin_locked(&nn->nn_lock);
338 if (!list_empty(&nsw->ns_node_item)) {
339 list_del_init(&nsw->ns_node_item);
340 nsw->ns_sys_status = sys_status;
341 nsw->ns_status = status;
342 idr_remove(&nn->nn_status_idr, nsw->ns_id);
343 wake_up(&nsw->ns_wq);
347 static void o2net_complete_nsw(struct o2net_node *nn,
348 struct o2net_status_wait *nsw,
349 u64 id, enum o2net_system_error sys_status,
352 spin_lock(&nn->nn_lock);
357 nsw = idr_find(&nn->nn_status_idr, id);
362 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
365 spin_unlock(&nn->nn_lock);
369 static void o2net_complete_nodes_nsw(struct o2net_node *nn)
371 struct o2net_status_wait *nsw, *tmp;
372 unsigned int num_kills = 0;
374 assert_spin_locked(&nn->nn_lock);
376 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
377 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
381 mlog(0, "completed %d messages for node %u\n", num_kills,
382 o2net_num_from_nn(nn));
385 static int o2net_nsw_completed(struct o2net_node *nn,
386 struct o2net_status_wait *nsw)
389 spin_lock(&nn->nn_lock);
390 completed = list_empty(&nsw->ns_node_item);
391 spin_unlock(&nn->nn_lock);
395 /* ------------------------------------------------------------ */
397 static void sc_kref_release(struct kref *kref)
399 struct o2net_sock_container *sc = container_of(kref,
400 struct o2net_sock_container, sc_kref);
401 BUG_ON(timer_pending(&sc->sc_idle_timeout));
403 sclog(sc, "releasing\n");
406 sock_release(sc->sc_sock);
410 o2nm_undepend_item(&sc->sc_node->nd_item);
411 o2nm_node_put(sc->sc_node);
414 o2net_debug_del_sc(sc);
418 static void sc_put(struct o2net_sock_container *sc)
421 kref_put(&sc->sc_kref, sc_kref_release);
423 static void sc_get(struct o2net_sock_container *sc)
426 kref_get(&sc->sc_kref);
428 static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
430 struct o2net_sock_container *sc, *ret = NULL;
431 struct page *page = NULL;
434 page = alloc_page(GFP_NOFS);
435 sc = kzalloc(sizeof(*sc), GFP_NOFS);
436 if (sc == NULL || page == NULL)
439 kref_init(&sc->sc_kref);
443 /* pin the node item of the remote node */
444 status = o2nm_depend_item(&node->nd_item);
450 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
451 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
452 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
453 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
455 init_timer(&sc->sc_idle_timeout);
456 sc->sc_idle_timeout.function = o2net_idle_timer;
457 sc->sc_idle_timeout.data = (unsigned long)sc;
459 sclog(sc, "alloced\n");
463 o2net_debug_add_sc(sc);
475 /* ------------------------------------------------------------ */
477 static void o2net_sc_queue_work(struct o2net_sock_container *sc,
478 struct work_struct *work)
481 if (!queue_work(o2net_wq, work))
484 static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
485 struct delayed_work *work,
489 if (!queue_delayed_work(o2net_wq, work, delay))
492 static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
493 struct delayed_work *work)
495 if (cancel_delayed_work(work))
499 static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
501 int o2net_num_connected_peers(void)
503 return atomic_read(&o2net_connected_peers);
506 static void o2net_set_nn_state(struct o2net_node *nn,
507 struct o2net_sock_container *sc,
508 unsigned valid, int err)
510 int was_valid = nn->nn_sc_valid;
511 int was_err = nn->nn_persistent_error;
512 struct o2net_sock_container *old_sc = nn->nn_sc;
514 assert_spin_locked(&nn->nn_lock);
517 atomic_dec(&o2net_connected_peers);
518 else if (!old_sc && sc)
519 atomic_inc(&o2net_connected_peers);
521 /* the node num comparison and single connect/accept path should stop
522 * an non-null sc from being overwritten with another */
523 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
524 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
525 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
527 if (was_valid && !valid && err == 0)
530 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
531 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
532 nn->nn_persistent_error, err);
535 nn->nn_sc_valid = valid ? 1 : 0;
536 nn->nn_persistent_error = err;
538 /* mirrors o2net_tx_can_proceed() */
539 if (nn->nn_persistent_error || nn->nn_sc_valid)
540 wake_up(&nn->nn_sc_wq);
542 if (!was_err && nn->nn_persistent_error) {
543 o2quo_conn_err(o2net_num_from_nn(nn));
544 queue_delayed_work(o2net_wq, &nn->nn_still_up,
545 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
548 if (was_valid && !valid) {
549 printk(KERN_NOTICE "o2net: No longer connected to "
550 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
551 o2net_complete_nodes_nsw(nn);
554 if (!was_valid && valid) {
555 o2quo_conn_up(o2net_num_from_nn(nn));
556 cancel_delayed_work(&nn->nn_connect_expired);
557 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
558 o2nm_this_node() > sc->sc_node->nd_num ?
559 "Connected to" : "Accepted connection from",
563 /* trigger the connecting worker func as long as we're not valid,
564 * it will back off if it shouldn't connect. This can be called
565 * from node config teardown and so needs to be careful about
566 * the work queue actually being up. */
567 if (!valid && o2net_wq) {
569 /* delay if we're within a RECONNECT_DELAY of the
571 delay = (nn->nn_last_connect_attempt +
572 msecs_to_jiffies(o2net_reconnect_delay()))
574 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
576 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
577 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
580 * Delay the expired work after idle timeout.
582 * We might have lots of failed connection attempts that run
583 * through here but we only cancel the connect_expired work when
584 * a connection attempt succeeds. So only the first enqueue of
585 * the connect_expired work will do anything. The rest will see
586 * that it's already queued and do nothing.
588 delay += msecs_to_jiffies(o2net_idle_timeout());
589 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
592 /* keep track of the nn's sc ref for the caller */
593 if ((old_sc == NULL) && sc)
595 if (old_sc && (old_sc != sc)) {
596 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
601 /* see o2net_register_callbacks() */
602 static void o2net_data_ready(struct sock *sk, int bytes)
604 void (*ready)(struct sock *sk, int bytes);
606 read_lock(&sk->sk_callback_lock);
607 if (sk->sk_user_data) {
608 struct o2net_sock_container *sc = sk->sk_user_data;
609 sclog(sc, "data_ready hit\n");
610 o2net_set_data_ready_time(sc);
611 o2net_sc_queue_work(sc, &sc->sc_rx_work);
612 ready = sc->sc_data_ready;
614 ready = sk->sk_data_ready;
616 read_unlock(&sk->sk_callback_lock);
621 /* see o2net_register_callbacks() */
622 static void o2net_state_change(struct sock *sk)
624 void (*state_change)(struct sock *sk);
625 struct o2net_sock_container *sc;
627 read_lock(&sk->sk_callback_lock);
628 sc = sk->sk_user_data;
630 state_change = sk->sk_state_change;
634 sclog(sc, "state_change to %d\n", sk->sk_state);
636 state_change = sc->sc_state_change;
638 switch(sk->sk_state) {
639 /* ignore connecting sockets as they make progress */
643 case TCP_ESTABLISHED:
644 o2net_sc_queue_work(sc, &sc->sc_connect_work);
647 printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT
648 " shutdown, state %d\n",
649 SC_NODEF_ARGS(sc), sk->sk_state);
650 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
654 read_unlock(&sk->sk_callback_lock);
659 * we register callbacks so we can queue work on events before calling
660 * the original callbacks. our callbacks our careful to test user_data
661 * to discover when they've reaced with o2net_unregister_callbacks().
663 static void o2net_register_callbacks(struct sock *sk,
664 struct o2net_sock_container *sc)
666 write_lock_bh(&sk->sk_callback_lock);
668 /* accepted sockets inherit the old listen socket data ready */
669 if (sk->sk_data_ready == o2net_listen_data_ready) {
670 sk->sk_data_ready = sk->sk_user_data;
671 sk->sk_user_data = NULL;
674 BUG_ON(sk->sk_user_data != NULL);
675 sk->sk_user_data = sc;
678 sc->sc_data_ready = sk->sk_data_ready;
679 sc->sc_state_change = sk->sk_state_change;
680 sk->sk_data_ready = o2net_data_ready;
681 sk->sk_state_change = o2net_state_change;
683 mutex_init(&sc->sc_send_lock);
685 write_unlock_bh(&sk->sk_callback_lock);
688 static int o2net_unregister_callbacks(struct sock *sk,
689 struct o2net_sock_container *sc)
693 write_lock_bh(&sk->sk_callback_lock);
694 if (sk->sk_user_data == sc) {
696 sk->sk_user_data = NULL;
697 sk->sk_data_ready = sc->sc_data_ready;
698 sk->sk_state_change = sc->sc_state_change;
700 write_unlock_bh(&sk->sk_callback_lock);
706 * this is a little helper that is called by callers who have seen a problem
707 * with an sc and want to detach it from the nn if someone already hasn't beat
708 * them to it. if an error is given then the shutdown will be persistent
709 * and pending transmits will be canceled.
711 static void o2net_ensure_shutdown(struct o2net_node *nn,
712 struct o2net_sock_container *sc,
715 spin_lock(&nn->nn_lock);
717 o2net_set_nn_state(nn, NULL, 0, err);
718 spin_unlock(&nn->nn_lock);
722 * This work queue function performs the blocking parts of socket shutdown. A
723 * few paths lead here. set_nn_state will trigger this callback if it sees an
724 * sc detached from the nn. state_change will also trigger this callback
725 * directly when it sees errors. In that case we need to call set_nn_state
726 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
729 static void o2net_shutdown_sc(struct work_struct *work)
731 struct o2net_sock_container *sc =
732 container_of(work, struct o2net_sock_container,
734 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
736 sclog(sc, "shutting down\n");
738 /* drop the callbacks ref and call shutdown only once */
739 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
740 /* we shouldn't flush as we're in the thread, the
741 * races with pending sc work structs are harmless */
742 del_timer_sync(&sc->sc_idle_timeout);
743 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
745 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
748 /* not fatal so failed connects before the other guy has our
749 * heartbeat can be retried */
750 o2net_ensure_shutdown(nn, sc, 0);
754 /* ------------------------------------------------------------ */
756 static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
759 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
762 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
767 static struct o2net_msg_handler *
768 o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
769 struct rb_node **ret_parent)
771 struct rb_node **p = &o2net_handler_tree.rb_node;
772 struct rb_node *parent = NULL;
773 struct o2net_msg_handler *nmh, *ret = NULL;
778 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
779 cmp = o2net_handler_cmp(nmh, msg_type, key);
793 if (ret_parent != NULL)
794 *ret_parent = parent;
799 static void o2net_handler_kref_release(struct kref *kref)
801 struct o2net_msg_handler *nmh;
802 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
807 static void o2net_handler_put(struct o2net_msg_handler *nmh)
809 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
812 /* max_len is protection for the handler func. incoming messages won't
813 * be given to the handler if their payload is longer than the max. */
814 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
815 o2net_msg_handler_func *func, void *data,
816 o2net_post_msg_handler_func *post_func,
817 struct list_head *unreg_list)
819 struct o2net_msg_handler *nmh = NULL;
820 struct rb_node **p, *parent;
823 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
824 mlog(0, "max_len for message handler out of range: %u\n",
831 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
837 mlog(0, "no message handler provided: %u, %p\n",
843 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
850 nmh->nh_func_data = data;
851 nmh->nh_post_func = post_func;
852 nmh->nh_msg_type = msg_type;
853 nmh->nh_max_len = max_len;
855 /* the tree and list get this ref.. they're both removed in
856 * unregister when this ref is dropped */
857 kref_init(&nmh->nh_kref);
858 INIT_LIST_HEAD(&nmh->nh_unregister_item);
860 write_lock(&o2net_handler_lock);
861 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
864 rb_link_node(&nmh->nh_node, parent, p);
865 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
866 list_add_tail(&nmh->nh_unregister_item, unreg_list);
868 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
869 func, msg_type, key);
870 /* we've had some trouble with handlers seemingly vanishing. */
871 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
873 "couldn't find handler we *just* registered "
874 "for type %u key %08x\n", msg_type, key);
876 write_unlock(&o2net_handler_lock);
886 EXPORT_SYMBOL_GPL(o2net_register_handler);
888 void o2net_unregister_handler_list(struct list_head *list)
890 struct o2net_msg_handler *nmh, *n;
892 write_lock(&o2net_handler_lock);
893 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
894 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
895 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
896 rb_erase(&nmh->nh_node, &o2net_handler_tree);
897 list_del_init(&nmh->nh_unregister_item);
898 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
900 write_unlock(&o2net_handler_lock);
902 EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
904 static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
906 struct o2net_msg_handler *nmh;
908 read_lock(&o2net_handler_lock);
909 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
911 kref_get(&nmh->nh_kref);
912 read_unlock(&o2net_handler_lock);
917 /* ------------------------------------------------------------ */
919 static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
927 struct msghdr msg = {
929 .msg_iov = (struct iovec *)&vec,
930 .msg_flags = MSG_DONTWAIT,
935 ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
941 static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
942 size_t veclen, size_t total)
946 struct msghdr msg = {
947 .msg_iov = (struct iovec *)vec,
948 .msg_iovlen = veclen,
958 ret = sock_sendmsg(sock, &msg, total);
961 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
964 ret = -EPIPE; /* should be smarter, I bet */
971 mlog(0, "returning error: %d\n", ret);
975 static void o2net_sendpage(struct o2net_sock_container *sc,
976 void *kmalloced_virt,
979 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
983 mutex_lock(&sc->sc_send_lock);
984 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
985 virt_to_page(kmalloced_virt),
986 (long)kmalloced_virt & ~PAGE_MASK,
988 mutex_unlock(&sc->sc_send_lock);
991 if (ret == (ssize_t)-EAGAIN) {
992 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
993 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
997 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
998 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
999 o2net_ensure_shutdown(nn, sc, 0);
1004 static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
1006 memset(msg, 0, sizeof(struct o2net_msg));
1007 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
1008 msg->data_len = cpu_to_be16(data_len);
1009 msg->msg_type = cpu_to_be16(msg_type);
1010 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
1012 msg->key = cpu_to_be32(key);
1015 static int o2net_tx_can_proceed(struct o2net_node *nn,
1016 struct o2net_sock_container **sc_ret,
1021 spin_lock(&nn->nn_lock);
1022 if (nn->nn_persistent_error) {
1025 *error = nn->nn_persistent_error;
1026 } else if (nn->nn_sc_valid) {
1027 kref_get(&nn->nn_sc->sc_kref);
1030 *sc_ret = nn->nn_sc;
1033 spin_unlock(&nn->nn_lock);
1038 /* Get a map of all nodes to which this node is currently connected to */
1039 void o2net_fill_node_map(unsigned long *map, unsigned bytes)
1041 struct o2net_sock_container *sc;
1044 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1046 memset(map, 0, bytes);
1047 for (node = 0; node < O2NM_MAX_NODES; ++node) {
1048 o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret);
1055 EXPORT_SYMBOL_GPL(o2net_fill_node_map);
1057 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1058 size_t caller_veclen, u8 target_node, int *status)
1061 struct o2net_msg *msg = NULL;
1062 size_t veclen, caller_bytes = 0;
1063 struct kvec *vec = NULL;
1064 struct o2net_sock_container *sc = NULL;
1065 struct o2net_node *nn = o2net_nn_from_num(target_node);
1066 struct o2net_status_wait nsw = {
1067 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
1069 struct o2net_send_tracking nst;
1071 o2net_init_nst(&nst, msg_type, key, current, target_node);
1073 if (o2net_wq == NULL) {
1074 mlog(0, "attempt to tx without o2netd running\n");
1079 if (caller_veclen == 0) {
1080 mlog(0, "bad kvec array length\n");
1085 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1086 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1087 mlog(0, "total payload len %zu too large\n", caller_bytes);
1092 if (target_node == o2nm_this_node()) {
1097 o2net_debug_add_nst(&nst);
1099 o2net_set_nst_sock_time(&nst);
1101 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
1105 o2net_set_nst_sock_container(&nst, sc);
1107 veclen = caller_veclen + 1;
1108 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
1110 mlog(0, "failed to %zu element kvec!\n", veclen);
1115 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1117 mlog(0, "failed to allocate a o2net_msg!\n");
1122 o2net_init_msg(msg, caller_bytes, msg_type, key);
1124 vec[0].iov_len = sizeof(struct o2net_msg);
1125 vec[0].iov_base = msg;
1126 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1128 ret = o2net_prep_nsw(nn, &nsw);
1132 msg->msg_num = cpu_to_be32(nsw.ns_id);
1133 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1135 o2net_set_nst_send_time(&nst);
1137 /* finally, convert the message header to network byte-order
1139 mutex_lock(&sc->sc_send_lock);
1140 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1141 sizeof(struct o2net_msg) + caller_bytes);
1142 mutex_unlock(&sc->sc_send_lock);
1143 msglog(msg, "sending returned %d\n", ret);
1145 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1149 /* wait on other node's handler */
1150 o2net_set_nst_status_time(&nst);
1151 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1153 o2net_update_send_stats(&nst, sc);
1155 /* Note that we avoid overwriting the callers status return
1156 * variable if a system error was reported on the other
1157 * side. Callers beware. */
1158 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1160 *status = nsw.ns_status;
1162 mlog(0, "woken, returning system status %d, user status %d\n",
1163 ret, nsw.ns_status);
1165 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
1170 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1173 EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1175 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1176 u8 target_node, int *status)
1182 return o2net_send_message_vec(msg_type, key, &vec, 1,
1183 target_node, status);
1185 EXPORT_SYMBOL_GPL(o2net_send_message);
1187 static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1188 enum o2net_system_error syserr, int err)
1192 .iov_len = sizeof(struct o2net_msg),
1195 BUG_ON(syserr >= O2NET_ERR_MAX);
1197 /* leave other fields intact from the incoming message, msg_num
1199 hdr->sys_status = cpu_to_be32(syserr);
1200 hdr->status = cpu_to_be32(err);
1201 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1204 msglog(hdr, "about to send status magic %d\n", err);
1205 /* hdr has been in host byteorder this whole time */
1206 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1209 /* this returns -errno if the header was unknown or too large, etc.
1210 * after this is called the buffer us reused for the next message */
1211 static int o2net_process_message(struct o2net_sock_container *sc,
1212 struct o2net_msg *hdr)
1214 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1215 int ret = 0, handler_status;
1216 enum o2net_system_error syserr;
1217 struct o2net_msg_handler *nmh = NULL;
1218 void *ret_data = NULL;
1220 msglog(hdr, "processing message\n");
1222 o2net_sc_postpone_idle(sc);
1224 switch(be16_to_cpu(hdr->magic)) {
1225 case O2NET_MSG_STATUS_MAGIC:
1226 /* special type for returning message status */
1227 o2net_complete_nsw(nn, NULL,
1228 be32_to_cpu(hdr->msg_num),
1229 be32_to_cpu(hdr->sys_status),
1230 be32_to_cpu(hdr->status));
1232 case O2NET_MSG_KEEP_REQ_MAGIC:
1233 o2net_sendpage(sc, o2net_keep_resp,
1234 sizeof(*o2net_keep_resp));
1236 case O2NET_MSG_KEEP_RESP_MAGIC:
1238 case O2NET_MSG_MAGIC:
1241 msglog(hdr, "bad magic\n");
1247 /* find a handler for it */
1249 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1250 be32_to_cpu(hdr->key));
1252 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1253 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1254 syserr = O2NET_ERR_NO_HNDLR;
1258 syserr = O2NET_ERR_NONE;
1260 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1261 syserr = O2NET_ERR_OVERFLOW;
1263 if (syserr != O2NET_ERR_NONE)
1266 o2net_set_func_start_time(sc);
1267 sc->sc_msg_key = be32_to_cpu(hdr->key);
1268 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1269 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1270 be16_to_cpu(hdr->data_len),
1271 nmh->nh_func_data, &ret_data);
1272 o2net_set_func_stop_time(sc);
1274 o2net_update_recv_stats(sc);
1277 /* this destroys the hdr, so don't use it after this */
1278 mutex_lock(&sc->sc_send_lock);
1279 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1281 mutex_unlock(&sc->sc_send_lock);
1283 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1284 handler_status, syserr, ret);
1287 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1288 if (nmh->nh_post_func)
1289 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1295 o2net_handler_put(nmh);
1299 static int o2net_check_handshake(struct o2net_sock_container *sc)
1301 struct o2net_handshake *hand = page_address(sc->sc_page);
1302 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1304 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1305 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net "
1306 "protocol version %llu but %llu is required. "
1307 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1308 (unsigned long long)be64_to_cpu(hand->protocol_version),
1309 O2NET_PROTOCOL_VERSION);
1311 /* don't bother reconnecting if its the wrong version. */
1312 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1317 * Ensure timeouts are consistent with other nodes, otherwise
1318 * we can end up with one node thinking that the other must be down,
1319 * but isn't. This can ultimately cause corruption.
1321 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
1322 o2net_idle_timeout()) {
1323 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network "
1324 "idle timeout of %u ms, but we use %u ms locally. "
1325 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1326 be32_to_cpu(hand->o2net_idle_timeout_ms),
1327 o2net_idle_timeout());
1328 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1332 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
1333 o2net_keepalive_delay()) {
1334 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive "
1335 "delay of %u ms, but we use %u ms locally. "
1336 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1337 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1338 o2net_keepalive_delay());
1339 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1343 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1344 O2HB_MAX_WRITE_TIMEOUT_MS) {
1345 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat "
1346 "timeout of %u ms, but we use %u ms locally. "
1347 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1348 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1349 O2HB_MAX_WRITE_TIMEOUT_MS);
1350 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1354 sc->sc_handshake_ok = 1;
1356 spin_lock(&nn->nn_lock);
1357 /* set valid and queue the idle timers only if it hasn't been
1358 * shut down already */
1359 if (nn->nn_sc == sc) {
1360 o2net_sc_reset_idle_timer(sc);
1361 atomic_set(&nn->nn_timeout, 0);
1362 o2net_set_nn_state(nn, sc, 1, 0);
1364 spin_unlock(&nn->nn_lock);
1366 /* shift everything up as though it wasn't there */
1367 sc->sc_page_off -= sizeof(struct o2net_handshake);
1368 if (sc->sc_page_off)
1369 memmove(hand, hand + 1, sc->sc_page_off);
1374 /* this demuxes the queued rx bytes into header or payload bits and calls
1375 * handlers as each full message is read off the socket. it returns -error,
1376 * == 0 eof, or > 0 for progress made.*/
1377 static int o2net_advance_rx(struct o2net_sock_container *sc)
1379 struct o2net_msg *hdr;
1384 sclog(sc, "receiving\n");
1385 o2net_set_advance_start_time(sc);
1387 if (unlikely(sc->sc_handshake_ok == 0)) {
1388 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1389 data = page_address(sc->sc_page) + sc->sc_page_off;
1390 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1391 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1393 sc->sc_page_off += ret;
1396 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1397 o2net_check_handshake(sc);
1398 if (unlikely(sc->sc_handshake_ok == 0))
1404 /* do we need more header? */
1405 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1406 data = page_address(sc->sc_page) + sc->sc_page_off;
1407 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1408 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1410 sc->sc_page_off += ret;
1411 /* only swab incoming here.. we can
1412 * only get here once as we cross from
1413 * being under to over */
1414 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1415 hdr = page_address(sc->sc_page);
1416 if (be16_to_cpu(hdr->data_len) >
1417 O2NET_MAX_PAYLOAD_BYTES)
1425 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1426 /* oof, still don't have a header */
1430 /* this was swabbed above when we first read it */
1431 hdr = page_address(sc->sc_page);
1433 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1435 /* do we need more payload? */
1436 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1437 /* need more payload */
1438 data = page_address(sc->sc_page) + sc->sc_page_off;
1439 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1441 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1443 sc->sc_page_off += ret;
1448 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1449 /* we can only get here once, the first time we read
1450 * the payload.. so set ret to progress if the handler
1451 * works out. after calling this the message is toast */
1452 ret = o2net_process_message(sc, hdr);
1455 sc->sc_page_off = 0;
1459 sclog(sc, "ret = %d\n", ret);
1460 o2net_set_advance_stop_time(sc);
1464 /* this work func is triggerd by data ready. it reads until it can read no
1465 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1466 * our work the work struct will be marked and we'll be called again. */
1467 static void o2net_rx_until_empty(struct work_struct *work)
1469 struct o2net_sock_container *sc =
1470 container_of(work, struct o2net_sock_container, sc_rx_work);
1474 ret = o2net_advance_rx(sc);
1477 if (ret <= 0 && ret != -EAGAIN) {
1478 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1479 sclog(sc, "saw error %d, closing\n", ret);
1480 /* not permanent so read failed handshake can retry */
1481 o2net_ensure_shutdown(nn, sc, 0);
1487 static int o2net_set_nodelay(struct socket *sock)
1496 * Dear unsuspecting programmer,
1498 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1499 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1500 * silently turn into SO_DEBUG.
1503 * Keeper of hilariously fragile interfaces.
1505 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1506 (char __user *)&val, sizeof(val));
1512 static void o2net_initialize_handshake(void)
1514 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1515 O2HB_MAX_WRITE_TIMEOUT_MS);
1516 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
1517 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
1518 o2net_keepalive_delay());
1519 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
1520 o2net_reconnect_delay());
1523 /* ------------------------------------------------------------ */
1525 /* called when a connect completes and after a sock is accepted. the
1526 * rx path will see the response and mark the sc valid */
1527 static void o2net_sc_connect_completed(struct work_struct *work)
1529 struct o2net_sock_container *sc =
1530 container_of(work, struct o2net_sock_container,
1533 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1534 (unsigned long long)O2NET_PROTOCOL_VERSION,
1535 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1537 o2net_initialize_handshake();
1538 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1542 /* this is called as a work_struct func. */
1543 static void o2net_sc_send_keep_req(struct work_struct *work)
1545 struct o2net_sock_container *sc =
1546 container_of(work, struct o2net_sock_container,
1547 sc_keepalive_work.work);
1549 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1553 /* socket shutdown does a del_timer_sync against this as it tears down.
1554 * we can't start this timer until we've got to the point in sc buildup
1555 * where shutdown is going to be involved */
1556 static void o2net_idle_timer(unsigned long data)
1558 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
1559 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1560 #ifdef CONFIG_DEBUG_FS
1561 unsigned long msecs = ktime_to_ms(ktime_get()) -
1562 ktime_to_ms(sc->sc_tv_timer);
1564 unsigned long msecs = o2net_idle_timeout();
1567 printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been "
1568 "idle for %lu.%lu secs, shutting it down.\n", SC_NODEF_ARGS(sc),
1569 msecs / 1000, msecs % 1000);
1572 * Initialize the nn_timeout so that the next connection attempt
1573 * will continue in o2net_start_connect.
1575 atomic_set(&nn->nn_timeout, 1);
1577 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
1580 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
1582 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1583 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
1584 msecs_to_jiffies(o2net_keepalive_delay()));
1585 o2net_set_sock_timer(sc);
1586 mod_timer(&sc->sc_idle_timeout,
1587 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
1590 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1592 /* Only push out an existing timer */
1593 if (timer_pending(&sc->sc_idle_timeout))
1594 o2net_sc_reset_idle_timer(sc);
1597 /* this work func is kicked whenever a path sets the nn state which doesn't
1598 * have valid set. This includes seeing hb come up, losing a connection,
1599 * having a connect attempt fail, etc. This centralizes the logic which decides
1600 * if a connect attempt should be made or if we should give up and all future
1601 * transmit attempts should fail */
1602 static void o2net_start_connect(struct work_struct *work)
1604 struct o2net_node *nn =
1605 container_of(work, struct o2net_node, nn_connect_work.work);
1606 struct o2net_sock_container *sc = NULL;
1607 struct o2nm_node *node = NULL, *mynode = NULL;
1608 struct socket *sock = NULL;
1609 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
1611 unsigned int timeout;
1613 /* if we're greater we initiate tx, otherwise we accept */
1614 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1617 /* watch for racing with tearing a node down */
1618 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1624 mynode = o2nm_get_node_by_num(o2nm_this_node());
1625 if (mynode == NULL) {
1630 spin_lock(&nn->nn_lock);
1632 * see if we already have one pending or have given up.
1633 * For nn_timeout, it is set when we close the connection
1634 * because of the idle time out. So it means that we have
1635 * at least connected to that node successfully once,
1636 * now try to connect to it again.
1638 timeout = atomic_read(&nn->nn_timeout);
1639 stop = (nn->nn_sc ||
1640 (nn->nn_persistent_error &&
1641 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
1642 spin_unlock(&nn->nn_lock);
1646 nn->nn_last_connect_attempt = jiffies;
1648 sc = sc_alloc(node);
1650 mlog(0, "couldn't allocate sc\n");
1655 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1657 mlog(0, "can't create socket: %d\n", ret);
1660 sc->sc_sock = sock; /* freed by sc_kref_release */
1662 sock->sk->sk_allocation = GFP_ATOMIC;
1664 myaddr.sin_family = AF_INET;
1665 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
1666 myaddr.sin_port = htons(0); /* any port */
1668 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1671 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1672 ret, &mynode->nd_ipv4_address);
1676 ret = o2net_set_nodelay(sc->sc_sock);
1678 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1682 o2net_register_callbacks(sc->sc_sock->sk, sc);
1684 spin_lock(&nn->nn_lock);
1685 /* handshake completion will set nn->nn_sc_valid */
1686 o2net_set_nn_state(nn, sc, 0, 0);
1687 spin_unlock(&nn->nn_lock);
1689 remoteaddr.sin_family = AF_INET;
1690 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1691 remoteaddr.sin_port = node->nd_ipv4_port;
1693 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1694 (struct sockaddr *)&remoteaddr,
1697 if (ret == -EINPROGRESS)
1702 printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT
1703 " failed with errno %d\n", SC_NODEF_ARGS(sc), ret);
1704 /* 0 err so that another will be queued and attempted
1705 * from set_nn_state */
1707 o2net_ensure_shutdown(nn, sc, 0);
1712 o2nm_node_put(node);
1714 o2nm_node_put(mynode);
1719 static void o2net_connect_expired(struct work_struct *work)
1721 struct o2net_node *nn =
1722 container_of(work, struct o2net_node, nn_connect_expired.work);
1724 spin_lock(&nn->nn_lock);
1725 if (!nn->nn_sc_valid) {
1726 printk(KERN_NOTICE "o2net: No connection established with "
1727 "node %u after %u.%u seconds, giving up.\n",
1728 o2net_num_from_nn(nn),
1729 o2net_idle_timeout() / 1000,
1730 o2net_idle_timeout() % 1000);
1732 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1734 spin_unlock(&nn->nn_lock);
1737 static void o2net_still_up(struct work_struct *work)
1739 struct o2net_node *nn =
1740 container_of(work, struct o2net_node, nn_still_up.work);
1742 o2quo_hb_still_up(o2net_num_from_nn(nn));
1745 /* ------------------------------------------------------------ */
1747 void o2net_disconnect_node(struct o2nm_node *node)
1749 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1751 /* don't reconnect until it's heartbeating again */
1752 spin_lock(&nn->nn_lock);
1753 atomic_set(&nn->nn_timeout, 0);
1754 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1755 spin_unlock(&nn->nn_lock);
1758 cancel_delayed_work(&nn->nn_connect_expired);
1759 cancel_delayed_work(&nn->nn_connect_work);
1760 cancel_delayed_work(&nn->nn_still_up);
1761 flush_workqueue(o2net_wq);
1765 static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1768 o2quo_hb_down(node_num);
1773 if (node_num != o2nm_this_node())
1774 o2net_disconnect_node(node);
1776 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
1779 static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1782 struct o2net_node *nn = o2net_nn_from_num(node_num);
1784 o2quo_hb_up(node_num);
1788 /* ensure an immediate connect attempt */
1789 nn->nn_last_connect_attempt = jiffies -
1790 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
1792 if (node_num != o2nm_this_node()) {
1793 /* believe it or not, accept and node hearbeating testing
1794 * can succeed for this node before we got here.. so
1795 * only use set_nn_state to clear the persistent error
1796 * if that hasn't already happened */
1797 spin_lock(&nn->nn_lock);
1798 atomic_set(&nn->nn_timeout, 0);
1799 if (nn->nn_persistent_error)
1800 o2net_set_nn_state(nn, NULL, 0, 0);
1801 spin_unlock(&nn->nn_lock);
1805 void o2net_unregister_hb_callbacks(void)
1807 o2hb_unregister_callback(NULL, &o2net_hb_up);
1808 o2hb_unregister_callback(NULL, &o2net_hb_down);
1811 int o2net_register_hb_callbacks(void)
1815 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1816 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1817 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1818 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1820 ret = o2hb_register_callback(NULL, &o2net_hb_up);
1822 ret = o2hb_register_callback(NULL, &o2net_hb_down);
1825 o2net_unregister_hb_callbacks();
1830 /* ------------------------------------------------------------ */
1832 static int o2net_accept_one(struct socket *sock)
1835 struct sockaddr_in sin;
1836 struct socket *new_sock = NULL;
1837 struct o2nm_node *node = NULL;
1838 struct o2nm_node *local_node = NULL;
1839 struct o2net_sock_container *sc = NULL;
1840 struct o2net_node *nn;
1842 BUG_ON(sock == NULL);
1843 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1844 sock->sk->sk_protocol, &new_sock);
1848 new_sock->type = sock->type;
1849 new_sock->ops = sock->ops;
1850 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1854 new_sock->sk->sk_allocation = GFP_ATOMIC;
1856 ret = o2net_set_nodelay(new_sock);
1858 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1863 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1868 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
1870 printk(KERN_NOTICE "o2net: Attempt to connect from unknown "
1871 "node at %pI4:%d\n", &sin.sin_addr.s_addr,
1872 ntohs(sin.sin_port));
1877 if (o2nm_this_node() >= node->nd_num) {
1878 local_node = o2nm_get_node_by_num(o2nm_this_node());
1879 printk(KERN_NOTICE "o2net: Unexpected connect attempt seen "
1880 "at node '%s' (%u, %pI4:%d) from node '%s' (%u, "
1881 "%pI4:%d)\n", local_node->nd_name, local_node->nd_num,
1882 &(local_node->nd_ipv4_address),
1883 ntohs(local_node->nd_ipv4_port), node->nd_name,
1884 node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port));
1889 /* this happens all the time when the other node sees our heartbeat
1890 * and tries to connect before we see their heartbeat */
1891 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1892 mlog(ML_CONN, "attempt to connect from node '%s' at "
1893 "%pI4:%d but it isn't heartbeating\n",
1894 node->nd_name, &sin.sin_addr.s_addr,
1895 ntohs(sin.sin_port));
1900 nn = o2net_nn_from_num(node->nd_num);
1902 spin_lock(&nn->nn_lock);
1907 spin_unlock(&nn->nn_lock);
1909 printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' "
1910 "at %pI4:%d but it already has an open connection\n",
1911 node->nd_name, &sin.sin_addr.s_addr,
1912 ntohs(sin.sin_port));
1916 sc = sc_alloc(node);
1922 sc->sc_sock = new_sock;
1925 spin_lock(&nn->nn_lock);
1926 atomic_set(&nn->nn_timeout, 0);
1927 o2net_set_nn_state(nn, sc, 0, 0);
1928 spin_unlock(&nn->nn_lock);
1930 o2net_register_callbacks(sc->sc_sock->sk, sc);
1931 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1933 o2net_initialize_handshake();
1934 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1938 sock_release(new_sock);
1940 o2nm_node_put(node);
1942 o2nm_node_put(local_node);
1948 static void o2net_accept_many(struct work_struct *work)
1950 struct socket *sock = o2net_listen_sock;
1951 while (o2net_accept_one(sock) == 0)
1955 static void o2net_listen_data_ready(struct sock *sk, int bytes)
1957 void (*ready)(struct sock *sk, int bytes);
1959 read_lock(&sk->sk_callback_lock);
1960 ready = sk->sk_user_data;
1961 if (ready == NULL) { /* check for teardown race */
1962 ready = sk->sk_data_ready;
1966 /* ->sk_data_ready is also called for a newly established child socket
1967 * before it has been accepted and the acceptor has set up their
1968 * data_ready.. we only want to queue listen work for our listening
1970 if (sk->sk_state == TCP_LISTEN) {
1971 mlog(ML_TCP, "bytes: %d\n", bytes);
1972 queue_work(o2net_wq, &o2net_listen_work);
1976 read_unlock(&sk->sk_callback_lock);
1980 static int o2net_open_listening_sock(__be32 addr, __be16 port)
1982 struct socket *sock = NULL;
1984 struct sockaddr_in sin = {
1985 .sin_family = PF_INET,
1986 .sin_addr = { .s_addr = addr },
1990 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1992 printk(KERN_ERR "o2net: Error %d while creating socket\n", ret);
1996 sock->sk->sk_allocation = GFP_ATOMIC;
1998 write_lock_bh(&sock->sk->sk_callback_lock);
1999 sock->sk->sk_user_data = sock->sk->sk_data_ready;
2000 sock->sk->sk_data_ready = o2net_listen_data_ready;
2001 write_unlock_bh(&sock->sk->sk_callback_lock);
2003 o2net_listen_sock = sock;
2004 INIT_WORK(&o2net_listen_work, o2net_accept_many);
2006 sock->sk->sk_reuse = SK_CAN_REUSE;
2007 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
2009 printk(KERN_ERR "o2net: Error %d while binding socket at "
2010 "%pI4:%u\n", ret, &addr, ntohs(port));
2014 ret = sock->ops->listen(sock, 64);
2016 printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n",
2017 ret, &addr, ntohs(port));
2021 o2net_listen_sock = NULL;
2029 * called from node manager when we should bring up our network listening
2030 * socket. node manager handles all the serialization to only call this
2031 * once and to match it with o2net_stop_listening(). note,
2032 * o2nm_this_node() doesn't work yet as we're being called while it
2035 int o2net_start_listening(struct o2nm_node *node)
2039 BUG_ON(o2net_wq != NULL);
2040 BUG_ON(o2net_listen_sock != NULL);
2042 mlog(ML_KTHREAD, "starting o2net thread...\n");
2043 o2net_wq = create_singlethread_workqueue("o2net");
2044 if (o2net_wq == NULL) {
2045 mlog(ML_ERROR, "unable to launch o2net thread\n");
2046 return -ENOMEM; /* ? */
2049 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2050 node->nd_ipv4_port);
2052 destroy_workqueue(o2net_wq);
2055 o2quo_conn_up(node->nd_num);
2060 /* again, o2nm_this_node() doesn't work here as we're involved in
2061 * tearing it down */
2062 void o2net_stop_listening(struct o2nm_node *node)
2064 struct socket *sock = o2net_listen_sock;
2067 BUG_ON(o2net_wq == NULL);
2068 BUG_ON(o2net_listen_sock == NULL);
2070 /* stop the listening socket from generating work */
2071 write_lock_bh(&sock->sk->sk_callback_lock);
2072 sock->sk->sk_data_ready = sock->sk->sk_user_data;
2073 sock->sk->sk_user_data = NULL;
2074 write_unlock_bh(&sock->sk->sk_callback_lock);
2076 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2077 struct o2nm_node *node = o2nm_get_node_by_num(i);
2079 o2net_disconnect_node(node);
2080 o2nm_node_put(node);
2084 /* finish all work and tear down the work queue */
2085 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2086 destroy_workqueue(o2net_wq);
2089 sock_release(o2net_listen_sock);
2090 o2net_listen_sock = NULL;
2092 o2quo_conn_err(node->nd_num);
2095 /* ------------------------------------------------------------ */
2097 int o2net_init(void)
2103 if (o2net_debugfs_init())
2106 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2107 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2108 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2109 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) {
2111 kfree(o2net_keep_req);
2112 kfree(o2net_keep_resp);
2116 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2117 o2net_hand->connector_id = cpu_to_be64(1);
2119 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2120 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2122 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2123 struct o2net_node *nn = o2net_nn_from_num(i);
2125 atomic_set(&nn->nn_timeout, 0);
2126 spin_lock_init(&nn->nn_lock);
2127 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2128 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2129 o2net_connect_expired);
2130 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
2131 /* until we see hb from a node we'll return einval */
2132 nn->nn_persistent_error = -ENOTCONN;
2133 init_waitqueue_head(&nn->nn_sc_wq);
2134 idr_init(&nn->nn_status_idr);
2135 INIT_LIST_HEAD(&nn->nn_status_list);
2141 void o2net_exit(void)
2145 kfree(o2net_keep_req);
2146 kfree(o2net_keep_resp);
2147 o2net_debugfs_exit();