1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Copyright (C) 2004 Oracle. All rights reserved.
8 * Callers for this were originally written against a very simple synchronus
9 * API. This implementation reflects those simple callers. Some day I'm sure
10 * we'll need to move to a more robust posting/callback mechanism.
12 * Transmit calls pass in kernel virtual addresses and block copying this into
13 * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting
14 * for a failed socket to timeout. TX callers can also pass in a poniter to an
15 * 'int' which gets filled with an errno off the wire in response to the
18 * Handlers for unsolicited messages are registered. Each socket has a page
19 * that incoming data is copied into. First the header, then the data.
20 * Handlers are called from only one thread with a reference to this per-socket
21 * page. This page is destroyed after the handler call, so it can't be
22 * referenced beyond the call. Handlers may block but are discouraged from
25 * Any framing errors (bad magic, large payload lengths) close a connection.
27 * Our sock_container holds the state we associate with a socket. It's current
28 * framing state is held there as well as the refcounting we do around when it
29 * is safe to tear down the socket. The socket is only finally torn down from
30 * the container when the container loses all of its references -- so as long
31 * as you hold a ref on the container you can trust that the socket is valid
32 * for use with kernel socket APIs.
34 * Connections are initiated between a pair of nodes when the node with the
35 * higher node number gets a heartbeat callback which indicates that the lower
36 * numbered node has started heartbeating. The lower numbered node is passive
37 * and only accepts the connection if the higher numbered node is heartbeating.
40 #include <linux/kernel.h>
41 #include <linux/sched/mm.h>
42 #include <linux/jiffies.h>
43 #include <linux/slab.h>
44 #include <linux/idr.h>
45 #include <linux/kref.h>
46 #include <linux/net.h>
47 #include <linux/export.h>
50 #include <linux/uaccess.h>
52 #include "heartbeat.h"
54 #include "nodemanager.h"
55 #define MLOG_MASK_PREFIX ML_TCP
59 #include "tcp_internal.h"
61 #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
62 #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
63 &sc->sc_node->nd_ipv4_address, \
64 ntohs(sc->sc_node->nd_ipv4_port)
67 * In the following two log macros, the whitespace after the ',' just
68 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
69 * previous token if args expands to nothing.
71 #define msglog(hdr, fmt, args...) do { \
72 typeof(hdr) __hdr = (hdr); \
73 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
74 "key %08x num %u] " fmt, \
75 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
76 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
77 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
78 be32_to_cpu(__hdr->msg_num) , ##args); \
81 #define sclog(sc, fmt, args...) do { \
82 typeof(sc) __sc = (sc); \
83 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
84 "pg_off %zu] " fmt, __sc, \
85 kref_read(&__sc->sc_kref), __sc->sc_sock, \
86 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
90 static DEFINE_RWLOCK(o2net_handler_lock);
91 static struct rb_root o2net_handler_tree = RB_ROOT;
93 static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
95 /* XXX someday we'll need better accounting */
96 static struct socket *o2net_listen_sock;
99 * listen work is only queued by the listening socket callbacks on the
100 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
101 * quorum work is queued as sock containers are shutdown.. stop_listening
102 * tears down all the node's sock containers, preventing future shutdowns
103 * and queued quroum work, before canceling delayed quorum work and
104 * destroying the work queue.
106 static struct workqueue_struct *o2net_wq;
107 static struct work_struct o2net_listen_work;
109 static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
110 #define O2NET_HB_PRI 0x1
112 static struct o2net_handshake *o2net_hand;
113 static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
115 static int o2net_sys_err_translations[O2NET_ERR_MAX] =
116 {[O2NET_ERR_NONE] = 0,
117 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
118 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
119 [O2NET_ERR_DIED] = -EHOSTDOWN,};
121 /* can't quite avoid *all* internal declarations :/ */
122 static void o2net_sc_connect_completed(struct work_struct *work);
123 static void o2net_rx_until_empty(struct work_struct *work);
124 static void o2net_shutdown_sc(struct work_struct *work);
125 static void o2net_listen_data_ready(struct sock *sk);
126 static void o2net_sc_send_keep_req(struct work_struct *work);
127 static void o2net_idle_timer(struct timer_list *t);
128 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
129 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
131 #ifdef CONFIG_DEBUG_FS
132 static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
133 u32 msgkey, struct task_struct *task, u8 node)
135 INIT_LIST_HEAD(&nst->st_net_debug_item);
137 nst->st_msg_type = msgtype;
138 nst->st_msg_key = msgkey;
142 static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
144 nst->st_sock_time = ktime_get();
147 static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
149 nst->st_send_time = ktime_get();
152 static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
154 nst->st_status_time = ktime_get();
157 static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
158 struct o2net_sock_container *sc)
163 static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
169 static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
171 sc->sc_tv_timer = ktime_get();
174 static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
176 sc->sc_tv_data_ready = ktime_get();
179 static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
181 sc->sc_tv_advance_start = ktime_get();
184 static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
186 sc->sc_tv_advance_stop = ktime_get();
189 static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
191 sc->sc_tv_func_start = ktime_get();
194 static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
196 sc->sc_tv_func_stop = ktime_get();
199 #else /* CONFIG_DEBUG_FS */
200 # define o2net_init_nst(a, b, c, d, e)
201 # define o2net_set_nst_sock_time(a)
202 # define o2net_set_nst_send_time(a)
203 # define o2net_set_nst_status_time(a)
204 # define o2net_set_nst_sock_container(a, b)
205 # define o2net_set_nst_msg_id(a, b)
206 # define o2net_set_sock_timer(a)
207 # define o2net_set_data_ready_time(a)
208 # define o2net_set_advance_start_time(a)
209 # define o2net_set_advance_stop_time(a)
210 # define o2net_set_func_start_time(a)
211 # define o2net_set_func_stop_time(a)
212 #endif /* CONFIG_DEBUG_FS */
214 #ifdef CONFIG_OCFS2_FS_STATS
215 static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc)
217 return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
220 static void o2net_update_send_stats(struct o2net_send_tracking *nst,
221 struct o2net_sock_container *sc)
223 sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
224 ktime_sub(ktime_get(),
225 nst->st_status_time));
226 sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
227 ktime_sub(nst->st_status_time,
229 sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
230 ktime_sub(nst->st_send_time,
235 static void o2net_update_recv_stats(struct o2net_sock_container *sc)
237 sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
238 o2net_get_func_run_time(sc));
244 # define o2net_update_send_stats(a, b)
246 # define o2net_update_recv_stats(sc)
248 #endif /* CONFIG_OCFS2_FS_STATS */
250 static inline unsigned int o2net_reconnect_delay(void)
252 return o2nm_single_cluster->cl_reconnect_delay_ms;
255 static inline unsigned int o2net_keepalive_delay(void)
257 return o2nm_single_cluster->cl_keepalive_delay_ms;
260 static inline unsigned int o2net_idle_timeout(void)
262 return o2nm_single_cluster->cl_idle_timeout_ms;
265 static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
268 BUG_ON(err >= O2NET_ERR_MAX);
269 trans = o2net_sys_err_translations[err];
271 /* Just in case we mess up the translation table above */
272 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
276 static struct o2net_node * o2net_nn_from_num(u8 node_num)
278 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
279 return &o2net_nodes[node_num];
282 static u8 o2net_num_from_nn(struct o2net_node *nn)
285 return nn - o2net_nodes;
288 /* ------------------------------------------------------------ */
290 static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
294 spin_lock(&nn->nn_lock);
295 ret = idr_alloc(&nn->nn_status_idr, nsw, 0, 0, GFP_ATOMIC);
298 list_add_tail(&nsw->ns_node_item, &nn->nn_status_list);
300 spin_unlock(&nn->nn_lock);
304 init_waitqueue_head(&nsw->ns_wq);
305 nsw->ns_sys_status = O2NET_ERR_NONE;
310 static void o2net_complete_nsw_locked(struct o2net_node *nn,
311 struct o2net_status_wait *nsw,
312 enum o2net_system_error sys_status,
315 assert_spin_locked(&nn->nn_lock);
317 if (!list_empty(&nsw->ns_node_item)) {
318 list_del_init(&nsw->ns_node_item);
319 nsw->ns_sys_status = sys_status;
320 nsw->ns_status = status;
321 idr_remove(&nn->nn_status_idr, nsw->ns_id);
322 wake_up(&nsw->ns_wq);
326 static void o2net_complete_nsw(struct o2net_node *nn,
327 struct o2net_status_wait *nsw,
328 u64 id, enum o2net_system_error sys_status,
331 spin_lock(&nn->nn_lock);
336 nsw = idr_find(&nn->nn_status_idr, id);
341 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
344 spin_unlock(&nn->nn_lock);
348 static void o2net_complete_nodes_nsw(struct o2net_node *nn)
350 struct o2net_status_wait *nsw, *tmp;
351 unsigned int num_kills = 0;
353 assert_spin_locked(&nn->nn_lock);
355 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
356 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
360 mlog(0, "completed %d messages for node %u\n", num_kills,
361 o2net_num_from_nn(nn));
364 static int o2net_nsw_completed(struct o2net_node *nn,
365 struct o2net_status_wait *nsw)
368 spin_lock(&nn->nn_lock);
369 completed = list_empty(&nsw->ns_node_item);
370 spin_unlock(&nn->nn_lock);
374 /* ------------------------------------------------------------ */
376 static void sc_kref_release(struct kref *kref)
378 struct o2net_sock_container *sc = container_of(kref,
379 struct o2net_sock_container, sc_kref);
380 BUG_ON(timer_pending(&sc->sc_idle_timeout));
382 sclog(sc, "releasing\n");
385 sock_release(sc->sc_sock);
389 o2nm_undepend_item(&sc->sc_node->nd_item);
390 o2nm_node_put(sc->sc_node);
393 o2net_debug_del_sc(sc);
396 __free_page(sc->sc_page);
400 static void sc_put(struct o2net_sock_container *sc)
403 kref_put(&sc->sc_kref, sc_kref_release);
405 static void sc_get(struct o2net_sock_container *sc)
408 kref_get(&sc->sc_kref);
410 static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
412 struct o2net_sock_container *sc, *ret = NULL;
413 struct page *page = NULL;
416 page = alloc_page(GFP_NOFS);
417 sc = kzalloc(sizeof(*sc), GFP_NOFS);
418 if (sc == NULL || page == NULL)
421 kref_init(&sc->sc_kref);
425 /* pin the node item of the remote node */
426 status = o2nm_depend_item(&node->nd_item);
432 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
433 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
434 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
435 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
437 timer_setup(&sc->sc_idle_timeout, o2net_idle_timer, 0);
439 sclog(sc, "alloced\n");
443 o2net_debug_add_sc(sc);
455 /* ------------------------------------------------------------ */
457 static void o2net_sc_queue_work(struct o2net_sock_container *sc,
458 struct work_struct *work)
461 if (!queue_work(o2net_wq, work))
464 static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
465 struct delayed_work *work,
469 if (!queue_delayed_work(o2net_wq, work, delay))
472 static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
473 struct delayed_work *work)
475 if (cancel_delayed_work(work))
479 static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
481 int o2net_num_connected_peers(void)
483 return atomic_read(&o2net_connected_peers);
486 static void o2net_set_nn_state(struct o2net_node *nn,
487 struct o2net_sock_container *sc,
488 unsigned valid, int err)
490 int was_valid = nn->nn_sc_valid;
491 int was_err = nn->nn_persistent_error;
492 struct o2net_sock_container *old_sc = nn->nn_sc;
494 assert_spin_locked(&nn->nn_lock);
497 atomic_dec(&o2net_connected_peers);
498 else if (!old_sc && sc)
499 atomic_inc(&o2net_connected_peers);
501 /* the node num comparison and single connect/accept path should stop
502 * an non-null sc from being overwritten with another */
503 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
504 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
505 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
507 if (was_valid && !valid && err == 0)
510 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
511 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
512 nn->nn_persistent_error, err);
515 nn->nn_sc_valid = valid ? 1 : 0;
516 nn->nn_persistent_error = err;
518 /* mirrors o2net_tx_can_proceed() */
519 if (nn->nn_persistent_error || nn->nn_sc_valid)
520 wake_up(&nn->nn_sc_wq);
522 if (was_valid && !was_err && nn->nn_persistent_error) {
523 o2quo_conn_err(o2net_num_from_nn(nn));
524 queue_delayed_work(o2net_wq, &nn->nn_still_up,
525 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
528 if (was_valid && !valid) {
530 printk(KERN_NOTICE "o2net: No longer connected to "
531 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
532 o2net_complete_nodes_nsw(nn);
535 if (!was_valid && valid) {
536 o2quo_conn_up(o2net_num_from_nn(nn));
537 cancel_delayed_work(&nn->nn_connect_expired);
538 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
539 o2nm_this_node() > sc->sc_node->nd_num ?
540 "Connected to" : "Accepted connection from",
544 /* trigger the connecting worker func as long as we're not valid,
545 * it will back off if it shouldn't connect. This can be called
546 * from node config teardown and so needs to be careful about
547 * the work queue actually being up. */
548 if (!valid && o2net_wq) {
550 /* delay if we're within a RECONNECT_DELAY of the
552 delay = (nn->nn_last_connect_attempt +
553 msecs_to_jiffies(o2net_reconnect_delay()))
555 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
557 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
558 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
561 * Delay the expired work after idle timeout.
563 * We might have lots of failed connection attempts that run
564 * through here but we only cancel the connect_expired work when
565 * a connection attempt succeeds. So only the first enqueue of
566 * the connect_expired work will do anything. The rest will see
567 * that it's already queued and do nothing.
569 delay += msecs_to_jiffies(o2net_idle_timeout());
570 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
573 /* keep track of the nn's sc ref for the caller */
574 if ((old_sc == NULL) && sc)
576 if (old_sc && (old_sc != sc)) {
577 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
582 /* see o2net_register_callbacks() */
583 static void o2net_data_ready(struct sock *sk)
585 void (*ready)(struct sock *sk);
586 struct o2net_sock_container *sc;
588 read_lock_bh(&sk->sk_callback_lock);
589 sc = sk->sk_user_data;
591 sclog(sc, "data_ready hit\n");
592 o2net_set_data_ready_time(sc);
593 o2net_sc_queue_work(sc, &sc->sc_rx_work);
594 ready = sc->sc_data_ready;
596 ready = sk->sk_data_ready;
598 read_unlock_bh(&sk->sk_callback_lock);
603 /* see o2net_register_callbacks() */
604 static void o2net_state_change(struct sock *sk)
606 void (*state_change)(struct sock *sk);
607 struct o2net_sock_container *sc;
609 read_lock_bh(&sk->sk_callback_lock);
610 sc = sk->sk_user_data;
612 state_change = sk->sk_state_change;
616 sclog(sc, "state_change to %d\n", sk->sk_state);
618 state_change = sc->sc_state_change;
620 switch(sk->sk_state) {
621 /* ignore connecting sockets as they make progress */
625 case TCP_ESTABLISHED:
626 o2net_sc_queue_work(sc, &sc->sc_connect_work);
629 printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT
630 " shutdown, state %d\n",
631 SC_NODEF_ARGS(sc), sk->sk_state);
632 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
636 read_unlock_bh(&sk->sk_callback_lock);
641 * we register callbacks so we can queue work on events before calling
642 * the original callbacks. our callbacks our careful to test user_data
643 * to discover when they've reaced with o2net_unregister_callbacks().
645 static void o2net_register_callbacks(struct sock *sk,
646 struct o2net_sock_container *sc)
648 write_lock_bh(&sk->sk_callback_lock);
650 /* accepted sockets inherit the old listen socket data ready */
651 if (sk->sk_data_ready == o2net_listen_data_ready) {
652 sk->sk_data_ready = sk->sk_user_data;
653 sk->sk_user_data = NULL;
656 BUG_ON(sk->sk_user_data != NULL);
657 sk->sk_user_data = sc;
660 sc->sc_data_ready = sk->sk_data_ready;
661 sc->sc_state_change = sk->sk_state_change;
662 sk->sk_data_ready = o2net_data_ready;
663 sk->sk_state_change = o2net_state_change;
665 mutex_init(&sc->sc_send_lock);
667 write_unlock_bh(&sk->sk_callback_lock);
670 static int o2net_unregister_callbacks(struct sock *sk,
671 struct o2net_sock_container *sc)
675 write_lock_bh(&sk->sk_callback_lock);
676 if (sk->sk_user_data == sc) {
678 sk->sk_user_data = NULL;
679 sk->sk_data_ready = sc->sc_data_ready;
680 sk->sk_state_change = sc->sc_state_change;
682 write_unlock_bh(&sk->sk_callback_lock);
688 * this is a little helper that is called by callers who have seen a problem
689 * with an sc and want to detach it from the nn if someone already hasn't beat
690 * them to it. if an error is given then the shutdown will be persistent
691 * and pending transmits will be canceled.
693 static void o2net_ensure_shutdown(struct o2net_node *nn,
694 struct o2net_sock_container *sc,
697 spin_lock(&nn->nn_lock);
699 o2net_set_nn_state(nn, NULL, 0, err);
700 spin_unlock(&nn->nn_lock);
704 * This work queue function performs the blocking parts of socket shutdown. A
705 * few paths lead here. set_nn_state will trigger this callback if it sees an
706 * sc detached from the nn. state_change will also trigger this callback
707 * directly when it sees errors. In that case we need to call set_nn_state
708 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
711 static void o2net_shutdown_sc(struct work_struct *work)
713 struct o2net_sock_container *sc =
714 container_of(work, struct o2net_sock_container,
716 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
718 sclog(sc, "shutting down\n");
720 /* drop the callbacks ref and call shutdown only once */
721 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
722 /* we shouldn't flush as we're in the thread, the
723 * races with pending sc work structs are harmless */
724 del_timer_sync(&sc->sc_idle_timeout);
725 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
727 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
730 /* not fatal so failed connects before the other guy has our
731 * heartbeat can be retried */
732 o2net_ensure_shutdown(nn, sc, 0);
736 /* ------------------------------------------------------------ */
738 static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
741 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
744 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
749 static struct o2net_msg_handler *
750 o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
751 struct rb_node **ret_parent)
753 struct rb_node **p = &o2net_handler_tree.rb_node;
754 struct rb_node *parent = NULL;
755 struct o2net_msg_handler *nmh, *ret = NULL;
760 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
761 cmp = o2net_handler_cmp(nmh, msg_type, key);
775 if (ret_parent != NULL)
776 *ret_parent = parent;
781 static void o2net_handler_kref_release(struct kref *kref)
783 struct o2net_msg_handler *nmh;
784 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
789 static void o2net_handler_put(struct o2net_msg_handler *nmh)
791 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
794 /* max_len is protection for the handler func. incoming messages won't
795 * be given to the handler if their payload is longer than the max. */
796 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
797 o2net_msg_handler_func *func, void *data,
798 o2net_post_msg_handler_func *post_func,
799 struct list_head *unreg_list)
801 struct o2net_msg_handler *nmh = NULL;
802 struct rb_node **p, *parent;
805 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
806 mlog(0, "max_len for message handler out of range: %u\n",
813 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
819 mlog(0, "no message handler provided: %u, %p\n",
825 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
832 nmh->nh_func_data = data;
833 nmh->nh_post_func = post_func;
834 nmh->nh_msg_type = msg_type;
835 nmh->nh_max_len = max_len;
837 /* the tree and list get this ref.. they're both removed in
838 * unregister when this ref is dropped */
839 kref_init(&nmh->nh_kref);
840 INIT_LIST_HEAD(&nmh->nh_unregister_item);
842 write_lock(&o2net_handler_lock);
843 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
846 rb_link_node(&nmh->nh_node, parent, p);
847 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
848 list_add_tail(&nmh->nh_unregister_item, unreg_list);
850 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
851 func, msg_type, key);
852 /* we've had some trouble with handlers seemingly vanishing. */
853 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
855 "couldn't find handler we *just* registered "
856 "for type %u key %08x\n", msg_type, key);
858 write_unlock(&o2net_handler_lock);
866 EXPORT_SYMBOL_GPL(o2net_register_handler);
868 void o2net_unregister_handler_list(struct list_head *list)
870 struct o2net_msg_handler *nmh, *n;
872 write_lock(&o2net_handler_lock);
873 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
874 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
875 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
876 rb_erase(&nmh->nh_node, &o2net_handler_tree);
877 list_del_init(&nmh->nh_unregister_item);
878 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
880 write_unlock(&o2net_handler_lock);
882 EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
884 static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
886 struct o2net_msg_handler *nmh;
888 read_lock(&o2net_handler_lock);
889 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
891 kref_get(&nmh->nh_kref);
892 read_unlock(&o2net_handler_lock);
897 /* ------------------------------------------------------------ */
899 static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
901 struct kvec vec = { .iov_len = len, .iov_base = data, };
902 struct msghdr msg = { .msg_flags = MSG_DONTWAIT, };
903 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, len);
904 return sock_recvmsg(sock, &msg, MSG_DONTWAIT);
907 static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
908 size_t veclen, size_t total)
911 struct msghdr msg = {.msg_flags = 0,};
918 ret = kernel_sendmsg(sock, &msg, vec, veclen, total);
919 if (likely(ret == total))
921 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, total);
923 ret = -EPIPE; /* should be smarter, I bet */
925 mlog(0, "returning error: %d\n", ret);
929 static void o2net_sendpage(struct o2net_sock_container *sc,
930 void *kmalloced_virt,
933 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
937 mutex_lock(&sc->sc_send_lock);
938 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
939 virt_to_page(kmalloced_virt),
940 offset_in_page(kmalloced_virt),
942 mutex_unlock(&sc->sc_send_lock);
945 if (ret == (ssize_t)-EAGAIN) {
946 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
947 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
951 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
952 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
953 o2net_ensure_shutdown(nn, sc, 0);
958 static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
960 memset(msg, 0, sizeof(struct o2net_msg));
961 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
962 msg->data_len = cpu_to_be16(data_len);
963 msg->msg_type = cpu_to_be16(msg_type);
964 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
966 msg->key = cpu_to_be32(key);
969 static int o2net_tx_can_proceed(struct o2net_node *nn,
970 struct o2net_sock_container **sc_ret,
975 spin_lock(&nn->nn_lock);
976 if (nn->nn_persistent_error) {
979 *error = nn->nn_persistent_error;
980 } else if (nn->nn_sc_valid) {
981 kref_get(&nn->nn_sc->sc_kref);
987 spin_unlock(&nn->nn_lock);
992 /* Get a map of all nodes to which this node is currently connected to */
993 void o2net_fill_node_map(unsigned long *map, unsigned bytes)
995 struct o2net_sock_container *sc;
998 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1000 memset(map, 0, bytes);
1001 for (node = 0; node < O2NM_MAX_NODES; ++node) {
1002 if (!o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret))
1010 EXPORT_SYMBOL_GPL(o2net_fill_node_map);
1012 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1013 size_t caller_veclen, u8 target_node, int *status)
1016 struct o2net_msg *msg = NULL;
1017 size_t veclen, caller_bytes = 0;
1018 struct kvec *vec = NULL;
1019 struct o2net_sock_container *sc = NULL;
1020 struct o2net_node *nn = o2net_nn_from_num(target_node);
1021 struct o2net_status_wait nsw = {
1022 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
1024 struct o2net_send_tracking nst;
1026 o2net_init_nst(&nst, msg_type, key, current, target_node);
1028 if (o2net_wq == NULL) {
1029 mlog(0, "attempt to tx without o2netd running\n");
1034 if (caller_veclen == 0) {
1035 mlog(0, "bad kvec array length\n");
1040 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1041 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1042 mlog(0, "total payload len %zu too large\n", caller_bytes);
1047 if (target_node == o2nm_this_node()) {
1052 o2net_debug_add_nst(&nst);
1054 o2net_set_nst_sock_time(&nst);
1056 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
1060 o2net_set_nst_sock_container(&nst, sc);
1062 veclen = caller_veclen + 1;
1063 vec = kmalloc_array(veclen, sizeof(struct kvec), GFP_ATOMIC);
1065 mlog(0, "failed to %zu element kvec!\n", veclen);
1070 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1072 mlog(0, "failed to allocate a o2net_msg!\n");
1077 o2net_init_msg(msg, caller_bytes, msg_type, key);
1079 vec[0].iov_len = sizeof(struct o2net_msg);
1080 vec[0].iov_base = msg;
1081 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1083 ret = o2net_prep_nsw(nn, &nsw);
1087 msg->msg_num = cpu_to_be32(nsw.ns_id);
1088 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1090 o2net_set_nst_send_time(&nst);
1092 /* finally, convert the message header to network byte-order
1094 mutex_lock(&sc->sc_send_lock);
1095 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1096 sizeof(struct o2net_msg) + caller_bytes);
1097 mutex_unlock(&sc->sc_send_lock);
1098 msglog(msg, "sending returned %d\n", ret);
1100 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1104 /* wait on other node's handler */
1105 o2net_set_nst_status_time(&nst);
1106 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1108 o2net_update_send_stats(&nst, sc);
1110 /* Note that we avoid overwriting the callers status return
1111 * variable if a system error was reported on the other
1112 * side. Callers beware. */
1113 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1115 *status = nsw.ns_status;
1117 mlog(0, "woken, returning system status %d, user status %d\n",
1118 ret, nsw.ns_status);
1120 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
1125 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1128 EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1130 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1131 u8 target_node, int *status)
1137 return o2net_send_message_vec(msg_type, key, &vec, 1,
1138 target_node, status);
1140 EXPORT_SYMBOL_GPL(o2net_send_message);
1142 static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1143 enum o2net_system_error syserr, int err)
1147 .iov_len = sizeof(struct o2net_msg),
1150 BUG_ON(syserr >= O2NET_ERR_MAX);
1152 /* leave other fields intact from the incoming message, msg_num
1154 hdr->sys_status = cpu_to_be32(syserr);
1155 hdr->status = cpu_to_be32(err);
1156 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1159 msglog(hdr, "about to send status magic %d\n", err);
1160 /* hdr has been in host byteorder this whole time */
1161 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1164 /* this returns -errno if the header was unknown or too large, etc.
1165 * after this is called the buffer us reused for the next message */
1166 static int o2net_process_message(struct o2net_sock_container *sc,
1167 struct o2net_msg *hdr)
1169 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1170 int ret = 0, handler_status;
1171 enum o2net_system_error syserr;
1172 struct o2net_msg_handler *nmh = NULL;
1173 void *ret_data = NULL;
1175 msglog(hdr, "processing message\n");
1177 o2net_sc_postpone_idle(sc);
1179 switch(be16_to_cpu(hdr->magic)) {
1180 case O2NET_MSG_STATUS_MAGIC:
1181 /* special type for returning message status */
1182 o2net_complete_nsw(nn, NULL,
1183 be32_to_cpu(hdr->msg_num),
1184 be32_to_cpu(hdr->sys_status),
1185 be32_to_cpu(hdr->status));
1187 case O2NET_MSG_KEEP_REQ_MAGIC:
1188 o2net_sendpage(sc, o2net_keep_resp,
1189 sizeof(*o2net_keep_resp));
1191 case O2NET_MSG_KEEP_RESP_MAGIC:
1193 case O2NET_MSG_MAGIC:
1196 msglog(hdr, "bad magic\n");
1201 /* find a handler for it */
1203 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1204 be32_to_cpu(hdr->key));
1206 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1207 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1208 syserr = O2NET_ERR_NO_HNDLR;
1212 syserr = O2NET_ERR_NONE;
1214 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1215 syserr = O2NET_ERR_OVERFLOW;
1217 if (syserr != O2NET_ERR_NONE)
1220 o2net_set_func_start_time(sc);
1221 sc->sc_msg_key = be32_to_cpu(hdr->key);
1222 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1223 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1224 be16_to_cpu(hdr->data_len),
1225 nmh->nh_func_data, &ret_data);
1226 o2net_set_func_stop_time(sc);
1228 o2net_update_recv_stats(sc);
1231 /* this destroys the hdr, so don't use it after this */
1232 mutex_lock(&sc->sc_send_lock);
1233 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1235 mutex_unlock(&sc->sc_send_lock);
1237 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1238 handler_status, syserr, ret);
1241 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1242 if (nmh->nh_post_func)
1243 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1249 o2net_handler_put(nmh);
1253 static int o2net_check_handshake(struct o2net_sock_container *sc)
1255 struct o2net_handshake *hand = page_address(sc->sc_page);
1256 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1258 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1259 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net "
1260 "protocol version %llu but %llu is required. "
1261 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1262 (unsigned long long)be64_to_cpu(hand->protocol_version),
1263 O2NET_PROTOCOL_VERSION);
1265 /* don't bother reconnecting if its the wrong version. */
1266 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1271 * Ensure timeouts are consistent with other nodes, otherwise
1272 * we can end up with one node thinking that the other must be down,
1273 * but isn't. This can ultimately cause corruption.
1275 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
1276 o2net_idle_timeout()) {
1277 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network "
1278 "idle timeout of %u ms, but we use %u ms locally. "
1279 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1280 be32_to_cpu(hand->o2net_idle_timeout_ms),
1281 o2net_idle_timeout());
1282 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1286 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
1287 o2net_keepalive_delay()) {
1288 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive "
1289 "delay of %u ms, but we use %u ms locally. "
1290 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1291 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1292 o2net_keepalive_delay());
1293 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1297 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1298 O2HB_MAX_WRITE_TIMEOUT_MS) {
1299 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat "
1300 "timeout of %u ms, but we use %u ms locally. "
1301 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1302 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1303 O2HB_MAX_WRITE_TIMEOUT_MS);
1304 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1308 sc->sc_handshake_ok = 1;
1310 spin_lock(&nn->nn_lock);
1311 /* set valid and queue the idle timers only if it hasn't been
1312 * shut down already */
1313 if (nn->nn_sc == sc) {
1314 o2net_sc_reset_idle_timer(sc);
1315 atomic_set(&nn->nn_timeout, 0);
1316 o2net_set_nn_state(nn, sc, 1, 0);
1318 spin_unlock(&nn->nn_lock);
1320 /* shift everything up as though it wasn't there */
1321 sc->sc_page_off -= sizeof(struct o2net_handshake);
1322 if (sc->sc_page_off)
1323 memmove(hand, hand + 1, sc->sc_page_off);
1328 /* this demuxes the queued rx bytes into header or payload bits and calls
1329 * handlers as each full message is read off the socket. it returns -error,
1330 * == 0 eof, or > 0 for progress made.*/
1331 static int o2net_advance_rx(struct o2net_sock_container *sc)
1333 struct o2net_msg *hdr;
1338 sclog(sc, "receiving\n");
1339 o2net_set_advance_start_time(sc);
1341 if (unlikely(sc->sc_handshake_ok == 0)) {
1342 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1343 data = page_address(sc->sc_page) + sc->sc_page_off;
1344 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1345 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1347 sc->sc_page_off += ret;
1350 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1351 o2net_check_handshake(sc);
1352 if (unlikely(sc->sc_handshake_ok == 0))
1358 /* do we need more header? */
1359 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1360 data = page_address(sc->sc_page) + sc->sc_page_off;
1361 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1362 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1364 sc->sc_page_off += ret;
1365 /* only swab incoming here.. we can
1366 * only get here once as we cross from
1367 * being under to over */
1368 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1369 hdr = page_address(sc->sc_page);
1370 if (be16_to_cpu(hdr->data_len) >
1371 O2NET_MAX_PAYLOAD_BYTES)
1379 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1380 /* oof, still don't have a header */
1384 /* this was swabbed above when we first read it */
1385 hdr = page_address(sc->sc_page);
1387 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1389 /* do we need more payload? */
1390 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1391 /* need more payload */
1392 data = page_address(sc->sc_page) + sc->sc_page_off;
1393 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1395 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1397 sc->sc_page_off += ret;
1402 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1403 /* we can only get here once, the first time we read
1404 * the payload.. so set ret to progress if the handler
1405 * works out. after calling this the message is toast */
1406 ret = o2net_process_message(sc, hdr);
1409 sc->sc_page_off = 0;
1413 sclog(sc, "ret = %d\n", ret);
1414 o2net_set_advance_stop_time(sc);
1418 /* this work func is triggerd by data ready. it reads until it can read no
1419 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1420 * our work the work struct will be marked and we'll be called again. */
1421 static void o2net_rx_until_empty(struct work_struct *work)
1423 struct o2net_sock_container *sc =
1424 container_of(work, struct o2net_sock_container, sc_rx_work);
1428 ret = o2net_advance_rx(sc);
1431 if (ret <= 0 && ret != -EAGAIN) {
1432 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1433 sclog(sc, "saw error %d, closing\n", ret);
1434 /* not permanent so read failed handshake can retry */
1435 o2net_ensure_shutdown(nn, sc, 0);
1441 static void o2net_initialize_handshake(void)
1443 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1444 O2HB_MAX_WRITE_TIMEOUT_MS);
1445 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
1446 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
1447 o2net_keepalive_delay());
1448 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
1449 o2net_reconnect_delay());
1452 /* ------------------------------------------------------------ */
1454 /* called when a connect completes and after a sock is accepted. the
1455 * rx path will see the response and mark the sc valid */
1456 static void o2net_sc_connect_completed(struct work_struct *work)
1458 struct o2net_sock_container *sc =
1459 container_of(work, struct o2net_sock_container,
1462 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1463 (unsigned long long)O2NET_PROTOCOL_VERSION,
1464 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1466 o2net_initialize_handshake();
1467 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1471 /* this is called as a work_struct func. */
1472 static void o2net_sc_send_keep_req(struct work_struct *work)
1474 struct o2net_sock_container *sc =
1475 container_of(work, struct o2net_sock_container,
1476 sc_keepalive_work.work);
1478 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1482 /* socket shutdown does a del_timer_sync against this as it tears down.
1483 * we can't start this timer until we've got to the point in sc buildup
1484 * where shutdown is going to be involved */
1485 static void o2net_idle_timer(struct timer_list *t)
1487 struct o2net_sock_container *sc = from_timer(sc, t, sc_idle_timeout);
1488 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1489 #ifdef CONFIG_DEBUG_FS
1490 unsigned long msecs = ktime_to_ms(ktime_get()) -
1491 ktime_to_ms(sc->sc_tv_timer);
1493 unsigned long msecs = o2net_idle_timeout();
1496 printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been "
1497 "idle for %lu.%lu secs.\n",
1498 SC_NODEF_ARGS(sc), msecs / 1000, msecs % 1000);
1500 /* idle timerout happen, don't shutdown the connection, but
1501 * make fence decision. Maybe the connection can recover before
1502 * the decision is made.
1504 atomic_set(&nn->nn_timeout, 1);
1505 o2quo_conn_err(o2net_num_from_nn(nn));
1506 queue_delayed_work(o2net_wq, &nn->nn_still_up,
1507 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
1509 o2net_sc_reset_idle_timer(sc);
1513 static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
1515 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1516 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
1517 msecs_to_jiffies(o2net_keepalive_delay()));
1518 o2net_set_sock_timer(sc);
1519 mod_timer(&sc->sc_idle_timeout,
1520 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
1523 static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1525 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1527 /* clear fence decision since the connection recover from timeout*/
1528 if (atomic_read(&nn->nn_timeout)) {
1529 o2quo_conn_up(o2net_num_from_nn(nn));
1530 cancel_delayed_work(&nn->nn_still_up);
1531 atomic_set(&nn->nn_timeout, 0);
1534 /* Only push out an existing timer */
1535 if (timer_pending(&sc->sc_idle_timeout))
1536 o2net_sc_reset_idle_timer(sc);
1539 /* this work func is kicked whenever a path sets the nn state which doesn't
1540 * have valid set. This includes seeing hb come up, losing a connection,
1541 * having a connect attempt fail, etc. This centralizes the logic which decides
1542 * if a connect attempt should be made or if we should give up and all future
1543 * transmit attempts should fail */
1544 static void o2net_start_connect(struct work_struct *work)
1546 struct o2net_node *nn =
1547 container_of(work, struct o2net_node, nn_connect_work.work);
1548 struct o2net_sock_container *sc = NULL;
1549 struct o2nm_node *node = NULL, *mynode = NULL;
1550 struct socket *sock = NULL;
1551 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
1553 unsigned int timeout;
1554 unsigned int nofs_flag;
1557 * sock_create allocates the sock with GFP_KERNEL. We must
1558 * prevent the filesystem from being reentered by memory reclaim.
1560 nofs_flag = memalloc_nofs_save();
1561 /* if we're greater we initiate tx, otherwise we accept */
1562 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1565 /* watch for racing with tearing a node down */
1566 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1570 mynode = o2nm_get_node_by_num(o2nm_this_node());
1574 spin_lock(&nn->nn_lock);
1576 * see if we already have one pending or have given up.
1577 * For nn_timeout, it is set when we close the connection
1578 * because of the idle time out. So it means that we have
1579 * at least connected to that node successfully once,
1580 * now try to connect to it again.
1582 timeout = atomic_read(&nn->nn_timeout);
1583 stop = (nn->nn_sc ||
1584 (nn->nn_persistent_error &&
1585 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
1586 spin_unlock(&nn->nn_lock);
1590 nn->nn_last_connect_attempt = jiffies;
1592 sc = sc_alloc(node);
1594 mlog(0, "couldn't allocate sc\n");
1599 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1601 mlog(0, "can't create socket: %d\n", ret);
1604 sc->sc_sock = sock; /* freed by sc_kref_release */
1606 sock->sk->sk_allocation = GFP_ATOMIC;
1608 myaddr.sin_family = AF_INET;
1609 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
1610 myaddr.sin_port = htons(0); /* any port */
1612 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1615 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1616 ret, &mynode->nd_ipv4_address);
1620 tcp_sock_set_nodelay(sc->sc_sock->sk);
1621 tcp_sock_set_user_timeout(sock->sk, O2NET_TCP_USER_TIMEOUT);
1623 o2net_register_callbacks(sc->sc_sock->sk, sc);
1625 spin_lock(&nn->nn_lock);
1626 /* handshake completion will set nn->nn_sc_valid */
1627 o2net_set_nn_state(nn, sc, 0, 0);
1628 spin_unlock(&nn->nn_lock);
1630 remoteaddr.sin_family = AF_INET;
1631 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1632 remoteaddr.sin_port = node->nd_ipv4_port;
1634 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1635 (struct sockaddr *)&remoteaddr,
1638 if (ret == -EINPROGRESS)
1643 printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT
1644 " failed with errno %d\n", SC_NODEF_ARGS(sc), ret);
1645 /* 0 err so that another will be queued and attempted
1646 * from set_nn_state */
1647 o2net_ensure_shutdown(nn, sc, 0);
1652 o2nm_node_put(node);
1654 o2nm_node_put(mynode);
1656 memalloc_nofs_restore(nofs_flag);
1660 static void o2net_connect_expired(struct work_struct *work)
1662 struct o2net_node *nn =
1663 container_of(work, struct o2net_node, nn_connect_expired.work);
1665 spin_lock(&nn->nn_lock);
1666 if (!nn->nn_sc_valid) {
1667 printk(KERN_NOTICE "o2net: No connection established with "
1668 "node %u after %u.%u seconds, check network and"
1669 " cluster configuration.\n",
1670 o2net_num_from_nn(nn),
1671 o2net_idle_timeout() / 1000,
1672 o2net_idle_timeout() % 1000);
1674 o2net_set_nn_state(nn, NULL, 0, 0);
1676 spin_unlock(&nn->nn_lock);
1679 static void o2net_still_up(struct work_struct *work)
1681 struct o2net_node *nn =
1682 container_of(work, struct o2net_node, nn_still_up.work);
1684 o2quo_hb_still_up(o2net_num_from_nn(nn));
1687 /* ------------------------------------------------------------ */
1689 void o2net_disconnect_node(struct o2nm_node *node)
1691 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1693 /* don't reconnect until it's heartbeating again */
1694 spin_lock(&nn->nn_lock);
1695 atomic_set(&nn->nn_timeout, 0);
1696 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1697 spin_unlock(&nn->nn_lock);
1700 cancel_delayed_work(&nn->nn_connect_expired);
1701 cancel_delayed_work(&nn->nn_connect_work);
1702 cancel_delayed_work(&nn->nn_still_up);
1703 flush_workqueue(o2net_wq);
1707 static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1710 o2quo_hb_down(node_num);
1715 if (node_num != o2nm_this_node())
1716 o2net_disconnect_node(node);
1718 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
1721 static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1724 struct o2net_node *nn = o2net_nn_from_num(node_num);
1726 o2quo_hb_up(node_num);
1730 /* ensure an immediate connect attempt */
1731 nn->nn_last_connect_attempt = jiffies -
1732 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
1734 if (node_num != o2nm_this_node()) {
1735 /* believe it or not, accept and node heartbeating testing
1736 * can succeed for this node before we got here.. so
1737 * only use set_nn_state to clear the persistent error
1738 * if that hasn't already happened */
1739 spin_lock(&nn->nn_lock);
1740 atomic_set(&nn->nn_timeout, 0);
1741 if (nn->nn_persistent_error)
1742 o2net_set_nn_state(nn, NULL, 0, 0);
1743 spin_unlock(&nn->nn_lock);
1747 void o2net_unregister_hb_callbacks(void)
1749 o2hb_unregister_callback(NULL, &o2net_hb_up);
1750 o2hb_unregister_callback(NULL, &o2net_hb_down);
1753 int o2net_register_hb_callbacks(void)
1757 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1758 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1759 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1760 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1762 ret = o2hb_register_callback(NULL, &o2net_hb_up);
1764 ret = o2hb_register_callback(NULL, &o2net_hb_down);
1767 o2net_unregister_hb_callbacks();
1772 /* ------------------------------------------------------------ */
1774 static int o2net_accept_one(struct socket *sock, int *more)
1777 struct sockaddr_in sin;
1778 struct socket *new_sock = NULL;
1779 struct o2nm_node *node = NULL;
1780 struct o2nm_node *local_node = NULL;
1781 struct o2net_sock_container *sc = NULL;
1782 struct o2net_node *nn;
1783 unsigned int nofs_flag;
1786 * sock_create_lite allocates the sock with GFP_KERNEL. We must
1787 * prevent the filesystem from being reentered by memory reclaim.
1789 nofs_flag = memalloc_nofs_save();
1791 BUG_ON(sock == NULL);
1793 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1794 sock->sk->sk_protocol, &new_sock);
1798 new_sock->type = sock->type;
1799 new_sock->ops = sock->ops;
1800 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK, false);
1805 new_sock->sk->sk_allocation = GFP_ATOMIC;
1807 tcp_sock_set_nodelay(new_sock->sk);
1808 tcp_sock_set_user_timeout(new_sock->sk, O2NET_TCP_USER_TIMEOUT);
1810 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, 1);
1814 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
1816 printk(KERN_NOTICE "o2net: Attempt to connect from unknown "
1817 "node at %pI4:%d\n", &sin.sin_addr.s_addr,
1818 ntohs(sin.sin_port));
1823 if (o2nm_this_node() >= node->nd_num) {
1824 local_node = o2nm_get_node_by_num(o2nm_this_node());
1826 printk(KERN_NOTICE "o2net: Unexpected connect attempt "
1827 "seen at node '%s' (%u, %pI4:%d) from "
1828 "node '%s' (%u, %pI4:%d)\n",
1829 local_node->nd_name, local_node->nd_num,
1830 &(local_node->nd_ipv4_address),
1831 ntohs(local_node->nd_ipv4_port),
1833 node->nd_num, &sin.sin_addr.s_addr,
1834 ntohs(sin.sin_port));
1839 /* this happens all the time when the other node sees our heartbeat
1840 * and tries to connect before we see their heartbeat */
1841 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1842 mlog(ML_CONN, "attempt to connect from node '%s' at "
1843 "%pI4:%d but it isn't heartbeating\n",
1844 node->nd_name, &sin.sin_addr.s_addr,
1845 ntohs(sin.sin_port));
1850 nn = o2net_nn_from_num(node->nd_num);
1852 spin_lock(&nn->nn_lock);
1857 spin_unlock(&nn->nn_lock);
1859 printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' "
1860 "at %pI4:%d but it already has an open connection\n",
1861 node->nd_name, &sin.sin_addr.s_addr,
1862 ntohs(sin.sin_port));
1866 sc = sc_alloc(node);
1872 sc->sc_sock = new_sock;
1875 spin_lock(&nn->nn_lock);
1876 atomic_set(&nn->nn_timeout, 0);
1877 o2net_set_nn_state(nn, sc, 0, 0);
1878 spin_unlock(&nn->nn_lock);
1880 o2net_register_callbacks(sc->sc_sock->sk, sc);
1881 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1883 o2net_initialize_handshake();
1884 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1888 sock_release(new_sock);
1890 o2nm_node_put(node);
1892 o2nm_node_put(local_node);
1896 memalloc_nofs_restore(nofs_flag);
1901 * This function is invoked in response to one or more
1902 * pending accepts at softIRQ level. We must drain the
1903 * entire que before returning.
1906 static void o2net_accept_many(struct work_struct *work)
1908 struct socket *sock = o2net_listen_sock;
1912 * It is critical to note that due to interrupt moderation
1913 * at the network driver level, we can't assume to get a
1914 * softIRQ for every single conn since tcp SYN packets
1915 * can arrive back-to-back, and therefore many pending
1916 * accepts may result in just 1 softIRQ. If we terminate
1917 * the o2net_accept_one() loop upon seeing an err, what happens
1918 * to the rest of the conns in the queue? If no new SYN
1919 * arrives for hours, no softIRQ will be delivered,
1920 * and the connections will just sit in the queue.
1924 o2net_accept_one(sock, &more);
1931 static void o2net_listen_data_ready(struct sock *sk)
1933 void (*ready)(struct sock *sk);
1935 read_lock_bh(&sk->sk_callback_lock);
1936 ready = sk->sk_user_data;
1937 if (ready == NULL) { /* check for teardown race */
1938 ready = sk->sk_data_ready;
1942 /* This callback may called twice when a new connection
1943 * is being established as a child socket inherits everything
1944 * from a parent LISTEN socket, including the data_ready cb of
1945 * the parent. This leads to a hazard. In o2net_accept_one()
1946 * we are still initializing the child socket but have not
1947 * changed the inherited data_ready callback yet when
1948 * data starts arriving.
1949 * We avoid this hazard by checking the state.
1950 * For the listening socket, the state will be TCP_LISTEN; for the new
1951 * socket, will be TCP_ESTABLISHED. Also, in this case,
1952 * sk->sk_user_data is not a valid function pointer.
1955 if (sk->sk_state == TCP_LISTEN) {
1956 queue_work(o2net_wq, &o2net_listen_work);
1962 read_unlock_bh(&sk->sk_callback_lock);
1967 static int o2net_open_listening_sock(__be32 addr, __be16 port)
1969 struct socket *sock = NULL;
1971 struct sockaddr_in sin = {
1972 .sin_family = PF_INET,
1973 .sin_addr = { .s_addr = addr },
1977 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1979 printk(KERN_ERR "o2net: Error %d while creating socket\n", ret);
1983 sock->sk->sk_allocation = GFP_ATOMIC;
1985 write_lock_bh(&sock->sk->sk_callback_lock);
1986 sock->sk->sk_user_data = sock->sk->sk_data_ready;
1987 sock->sk->sk_data_ready = o2net_listen_data_ready;
1988 write_unlock_bh(&sock->sk->sk_callback_lock);
1990 o2net_listen_sock = sock;
1991 INIT_WORK(&o2net_listen_work, o2net_accept_many);
1993 sock->sk->sk_reuse = SK_CAN_REUSE;
1994 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
1996 printk(KERN_ERR "o2net: Error %d while binding socket at "
1997 "%pI4:%u\n", ret, &addr, ntohs(port));
2001 ret = sock->ops->listen(sock, 64);
2003 printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n",
2004 ret, &addr, ntohs(port));
2008 o2net_listen_sock = NULL;
2016 * called from node manager when we should bring up our network listening
2017 * socket. node manager handles all the serialization to only call this
2018 * once and to match it with o2net_stop_listening(). note,
2019 * o2nm_this_node() doesn't work yet as we're being called while it
2022 int o2net_start_listening(struct o2nm_node *node)
2026 BUG_ON(o2net_wq != NULL);
2027 BUG_ON(o2net_listen_sock != NULL);
2029 mlog(ML_KTHREAD, "starting o2net thread...\n");
2030 o2net_wq = alloc_ordered_workqueue("o2net", WQ_MEM_RECLAIM);
2031 if (o2net_wq == NULL) {
2032 mlog(ML_ERROR, "unable to launch o2net thread\n");
2033 return -ENOMEM; /* ? */
2036 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2037 node->nd_ipv4_port);
2039 destroy_workqueue(o2net_wq);
2042 o2quo_conn_up(node->nd_num);
2047 /* again, o2nm_this_node() doesn't work here as we're involved in
2048 * tearing it down */
2049 void o2net_stop_listening(struct o2nm_node *node)
2051 struct socket *sock = o2net_listen_sock;
2054 BUG_ON(o2net_wq == NULL);
2055 BUG_ON(o2net_listen_sock == NULL);
2057 /* stop the listening socket from generating work */
2058 write_lock_bh(&sock->sk->sk_callback_lock);
2059 sock->sk->sk_data_ready = sock->sk->sk_user_data;
2060 sock->sk->sk_user_data = NULL;
2061 write_unlock_bh(&sock->sk->sk_callback_lock);
2063 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2064 struct o2nm_node *node = o2nm_get_node_by_num(i);
2066 o2net_disconnect_node(node);
2067 o2nm_node_put(node);
2071 /* finish all work and tear down the work queue */
2072 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2073 destroy_workqueue(o2net_wq);
2076 sock_release(o2net_listen_sock);
2077 o2net_listen_sock = NULL;
2079 o2quo_conn_err(node->nd_num);
2082 /* ------------------------------------------------------------ */
2084 int o2net_init(void)
2090 o2net_debugfs_init();
2092 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2093 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2094 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2095 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp)
2098 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2099 o2net_hand->connector_id = cpu_to_be64(1);
2101 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2102 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2104 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2105 struct o2net_node *nn = o2net_nn_from_num(i);
2107 atomic_set(&nn->nn_timeout, 0);
2108 spin_lock_init(&nn->nn_lock);
2109 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2110 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2111 o2net_connect_expired);
2112 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
2113 /* until we see hb from a node we'll return einval */
2114 nn->nn_persistent_error = -ENOTCONN;
2115 init_waitqueue_head(&nn->nn_sc_wq);
2116 idr_init(&nn->nn_status_idr);
2117 INIT_LIST_HEAD(&nn->nn_status_list);
2124 kfree(o2net_keep_req);
2125 kfree(o2net_keep_resp);
2126 o2net_debugfs_exit();
2131 void o2net_exit(void)
2135 kfree(o2net_keep_req);
2136 kfree(o2net_keep_resp);
2137 o2net_debugfs_exit();