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>
63 #include <asm/uaccess.h>
65 #include "heartbeat.h"
67 #include "nodemanager.h"
68 #define MLOG_MASK_PREFIX ML_TCP
72 #include "tcp_internal.h"
75 * The linux network stack isn't sparse endian clean.. It has macros like
76 * ntohs() which perform the endian checks and structs like sockaddr_in
77 * which aren't annotated. So __force is found here to get the build
78 * clean. When they emerge from the dark ages and annotate the code
79 * we can remove these.
82 #define SC_NODEF_FMT "node %s (num %u) at %u.%u.%u.%u:%u"
83 #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
84 NIPQUAD(sc->sc_node->nd_ipv4_address), \
85 ntohs(sc->sc_node->nd_ipv4_port)
88 * In the following two log macros, the whitespace after the ',' just
89 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
90 * previous token if args expands to nothing.
92 #define msglog(hdr, fmt, args...) do { \
93 typeof(hdr) __hdr = (hdr); \
94 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
95 "key %08x num %u] " fmt, \
96 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
97 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
98 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
99 be32_to_cpu(__hdr->msg_num) , ##args); \
102 #define sclog(sc, fmt, args...) do { \
103 typeof(sc) __sc = (sc); \
104 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
105 "pg_off %zu] " fmt, __sc, \
106 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
107 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
111 static DEFINE_RWLOCK(o2net_handler_lock
);
112 static struct rb_root o2net_handler_tree
= RB_ROOT
;
114 static struct o2net_node o2net_nodes
[O2NM_MAX_NODES
];
116 /* XXX someday we'll need better accounting */
117 static struct socket
*o2net_listen_sock
= NULL
;
120 * listen work is only queued by the listening socket callbacks on the
121 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
122 * quorum work is queued as sock containers are shutdown.. stop_listening
123 * tears down all the node's sock containers, preventing future shutdowns
124 * and queued quroum work, before canceling delayed quorum work and
125 * destroying the work queue.
127 static struct workqueue_struct
*o2net_wq
;
128 static struct work_struct o2net_listen_work
;
130 static struct o2hb_callback_func o2net_hb_up
, o2net_hb_down
;
131 #define O2NET_HB_PRI 0x1
133 static struct o2net_handshake
*o2net_hand
;
134 static struct o2net_msg
*o2net_keep_req
, *o2net_keep_resp
;
136 static int o2net_sys_err_translations
[O2NET_ERR_MAX
] =
137 {[O2NET_ERR_NONE
] = 0,
138 [O2NET_ERR_NO_HNDLR
] = -ENOPROTOOPT
,
139 [O2NET_ERR_OVERFLOW
] = -EOVERFLOW
,
140 [O2NET_ERR_DIED
] = -EHOSTDOWN
,};
142 /* can't quite avoid *all* internal declarations :/ */
143 static void o2net_sc_connect_completed(struct work_struct
*work
);
144 static void o2net_rx_until_empty(struct work_struct
*work
);
145 static void o2net_shutdown_sc(struct work_struct
*work
);
146 static void o2net_listen_data_ready(struct sock
*sk
, int bytes
);
147 static void o2net_sc_send_keep_req(struct work_struct
*work
);
148 static void o2net_idle_timer(unsigned long data
);
149 static void o2net_sc_postpone_idle(struct o2net_sock_container
*sc
);
150 static void o2net_sc_reset_idle_timer(struct o2net_sock_container
*sc
);
153 * FIXME: These should use to_o2nm_cluster_from_node(), but we end up
154 * losing our parent link to the cluster during shutdown. This can be
155 * solved by adding a pre-removal callback to configfs, or passing
156 * around the cluster with the node. -jeffm
158 static inline int o2net_reconnect_delay(struct o2nm_node
*node
)
160 return o2nm_single_cluster
->cl_reconnect_delay_ms
;
163 static inline int o2net_keepalive_delay(struct o2nm_node
*node
)
165 return o2nm_single_cluster
->cl_keepalive_delay_ms
;
168 static inline int o2net_idle_timeout(struct o2nm_node
*node
)
170 return o2nm_single_cluster
->cl_idle_timeout_ms
;
173 static inline int o2net_sys_err_to_errno(enum o2net_system_error err
)
176 BUG_ON(err
>= O2NET_ERR_MAX
);
177 trans
= o2net_sys_err_translations
[err
];
179 /* Just in case we mess up the translation table above */
180 BUG_ON(err
!= O2NET_ERR_NONE
&& trans
== 0);
184 static struct o2net_node
* o2net_nn_from_num(u8 node_num
)
186 BUG_ON(node_num
>= ARRAY_SIZE(o2net_nodes
));
187 return &o2net_nodes
[node_num
];
190 static u8
o2net_num_from_nn(struct o2net_node
*nn
)
193 return nn
- o2net_nodes
;
196 /* ------------------------------------------------------------ */
198 static int o2net_prep_nsw(struct o2net_node
*nn
, struct o2net_status_wait
*nsw
)
203 if (!idr_pre_get(&nn
->nn_status_idr
, GFP_ATOMIC
)) {
207 spin_lock(&nn
->nn_lock
);
208 ret
= idr_get_new(&nn
->nn_status_idr
, nsw
, &nsw
->ns_id
);
210 list_add_tail(&nsw
->ns_node_item
,
211 &nn
->nn_status_list
);
212 spin_unlock(&nn
->nn_lock
);
213 } while (ret
== -EAGAIN
);
216 init_waitqueue_head(&nsw
->ns_wq
);
217 nsw
->ns_sys_status
= O2NET_ERR_NONE
;
224 static void o2net_complete_nsw_locked(struct o2net_node
*nn
,
225 struct o2net_status_wait
*nsw
,
226 enum o2net_system_error sys_status
,
229 assert_spin_locked(&nn
->nn_lock
);
231 if (!list_empty(&nsw
->ns_node_item
)) {
232 list_del_init(&nsw
->ns_node_item
);
233 nsw
->ns_sys_status
= sys_status
;
234 nsw
->ns_status
= status
;
235 idr_remove(&nn
->nn_status_idr
, nsw
->ns_id
);
236 wake_up(&nsw
->ns_wq
);
240 static void o2net_complete_nsw(struct o2net_node
*nn
,
241 struct o2net_status_wait
*nsw
,
242 u64 id
, enum o2net_system_error sys_status
,
245 spin_lock(&nn
->nn_lock
);
250 nsw
= idr_find(&nn
->nn_status_idr
, id
);
255 o2net_complete_nsw_locked(nn
, nsw
, sys_status
, status
);
258 spin_unlock(&nn
->nn_lock
);
262 static void o2net_complete_nodes_nsw(struct o2net_node
*nn
)
264 struct list_head
*iter
, *tmp
;
265 unsigned int num_kills
= 0;
266 struct o2net_status_wait
*nsw
;
268 assert_spin_locked(&nn
->nn_lock
);
270 list_for_each_safe(iter
, tmp
, &nn
->nn_status_list
) {
271 nsw
= list_entry(iter
, struct o2net_status_wait
, ns_node_item
);
272 o2net_complete_nsw_locked(nn
, nsw
, O2NET_ERR_DIED
, 0);
276 mlog(0, "completed %d messages for node %u\n", num_kills
,
277 o2net_num_from_nn(nn
));
280 static int o2net_nsw_completed(struct o2net_node
*nn
,
281 struct o2net_status_wait
*nsw
)
284 spin_lock(&nn
->nn_lock
);
285 completed
= list_empty(&nsw
->ns_node_item
);
286 spin_unlock(&nn
->nn_lock
);
290 /* ------------------------------------------------------------ */
292 static void sc_kref_release(struct kref
*kref
)
294 struct o2net_sock_container
*sc
= container_of(kref
,
295 struct o2net_sock_container
, sc_kref
);
296 BUG_ON(timer_pending(&sc
->sc_idle_timeout
));
298 sclog(sc
, "releasing\n");
301 sock_release(sc
->sc_sock
);
305 o2nm_node_put(sc
->sc_node
);
311 static void sc_put(struct o2net_sock_container
*sc
)
314 kref_put(&sc
->sc_kref
, sc_kref_release
);
316 static void sc_get(struct o2net_sock_container
*sc
)
319 kref_get(&sc
->sc_kref
);
321 static struct o2net_sock_container
*sc_alloc(struct o2nm_node
*node
)
323 struct o2net_sock_container
*sc
, *ret
= NULL
;
324 struct page
*page
= NULL
;
326 page
= alloc_page(GFP_NOFS
);
327 sc
= kzalloc(sizeof(*sc
), GFP_NOFS
);
328 if (sc
== NULL
|| page
== NULL
)
331 kref_init(&sc
->sc_kref
);
335 INIT_WORK(&sc
->sc_connect_work
, o2net_sc_connect_completed
);
336 INIT_WORK(&sc
->sc_rx_work
, o2net_rx_until_empty
);
337 INIT_WORK(&sc
->sc_shutdown_work
, o2net_shutdown_sc
);
338 INIT_DELAYED_WORK(&sc
->sc_keepalive_work
, o2net_sc_send_keep_req
);
340 init_timer(&sc
->sc_idle_timeout
);
341 sc
->sc_idle_timeout
.function
= o2net_idle_timer
;
342 sc
->sc_idle_timeout
.data
= (unsigned long)sc
;
344 sclog(sc
, "alloced\n");
359 /* ------------------------------------------------------------ */
361 static void o2net_sc_queue_work(struct o2net_sock_container
*sc
,
362 struct work_struct
*work
)
365 if (!queue_work(o2net_wq
, work
))
368 static void o2net_sc_queue_delayed_work(struct o2net_sock_container
*sc
,
369 struct delayed_work
*work
,
373 if (!queue_delayed_work(o2net_wq
, work
, delay
))
376 static void o2net_sc_cancel_delayed_work(struct o2net_sock_container
*sc
,
377 struct delayed_work
*work
)
379 if (cancel_delayed_work(work
))
383 static atomic_t o2net_connected_peers
= ATOMIC_INIT(0);
385 int o2net_num_connected_peers(void)
387 return atomic_read(&o2net_connected_peers
);
390 static void o2net_set_nn_state(struct o2net_node
*nn
,
391 struct o2net_sock_container
*sc
,
392 unsigned valid
, int err
)
394 int was_valid
= nn
->nn_sc_valid
;
395 int was_err
= nn
->nn_persistent_error
;
396 struct o2net_sock_container
*old_sc
= nn
->nn_sc
;
398 assert_spin_locked(&nn
->nn_lock
);
401 atomic_dec(&o2net_connected_peers
);
402 else if (!old_sc
&& sc
)
403 atomic_inc(&o2net_connected_peers
);
405 /* the node num comparison and single connect/accept path should stop
406 * an non-null sc from being overwritten with another */
407 BUG_ON(sc
&& nn
->nn_sc
&& nn
->nn_sc
!= sc
);
408 mlog_bug_on_msg(err
&& valid
, "err %d valid %u\n", err
, valid
);
409 mlog_bug_on_msg(valid
&& !sc
, "valid %u sc %p\n", valid
, sc
);
411 /* we won't reconnect after our valid conn goes away for
412 * this hb iteration.. here so it shows up in the logs */
413 if (was_valid
&& !valid
&& err
== 0)
416 mlog(ML_CONN
, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
417 o2net_num_from_nn(nn
), nn
->nn_sc
, sc
, nn
->nn_sc_valid
, valid
,
418 nn
->nn_persistent_error
, err
);
421 nn
->nn_sc_valid
= valid
? 1 : 0;
422 nn
->nn_persistent_error
= err
;
424 /* mirrors o2net_tx_can_proceed() */
425 if (nn
->nn_persistent_error
|| nn
->nn_sc_valid
)
426 wake_up(&nn
->nn_sc_wq
);
428 if (!was_err
&& nn
->nn_persistent_error
) {
429 o2quo_conn_err(o2net_num_from_nn(nn
));
430 queue_delayed_work(o2net_wq
, &nn
->nn_still_up
,
431 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS
));
434 if (was_valid
&& !valid
) {
435 printk(KERN_INFO
"o2net: no longer connected to "
436 SC_NODEF_FMT
"\n", SC_NODEF_ARGS(old_sc
));
437 o2net_complete_nodes_nsw(nn
);
440 if (!was_valid
&& valid
) {
441 o2quo_conn_up(o2net_num_from_nn(nn
));
442 /* this is a bit of a hack. we only try reconnecting
443 * when heartbeating starts until we get a connection.
444 * if that connection then dies we don't try reconnecting.
445 * the only way to start connecting again is to down
446 * heartbeat and bring it back up. */
447 cancel_delayed_work(&nn
->nn_connect_expired
);
448 printk(KERN_INFO
"o2net: %s " SC_NODEF_FMT
"\n",
449 o2nm_this_node() > sc
->sc_node
->nd_num
?
450 "connected to" : "accepted connection from",
454 /* trigger the connecting worker func as long as we're not valid,
455 * it will back off if it shouldn't connect. This can be called
456 * from node config teardown and so needs to be careful about
457 * the work queue actually being up. */
458 if (!valid
&& o2net_wq
) {
460 /* delay if we're withing a RECONNECT_DELAY of the
462 delay
= (nn
->nn_last_connect_attempt
+
463 msecs_to_jiffies(o2net_reconnect_delay(sc
->sc_node
)))
465 if (delay
> msecs_to_jiffies(o2net_reconnect_delay(sc
->sc_node
)))
467 mlog(ML_CONN
, "queueing conn attempt in %lu jiffies\n", delay
);
468 queue_delayed_work(o2net_wq
, &nn
->nn_connect_work
, delay
);
471 /* keep track of the nn's sc ref for the caller */
472 if ((old_sc
== NULL
) && sc
)
474 if (old_sc
&& (old_sc
!= sc
)) {
475 o2net_sc_queue_work(old_sc
, &old_sc
->sc_shutdown_work
);
480 /* see o2net_register_callbacks() */
481 static void o2net_data_ready(struct sock
*sk
, int bytes
)
483 void (*ready
)(struct sock
*sk
, int bytes
);
485 read_lock(&sk
->sk_callback_lock
);
486 if (sk
->sk_user_data
) {
487 struct o2net_sock_container
*sc
= sk
->sk_user_data
;
488 sclog(sc
, "data_ready hit\n");
489 do_gettimeofday(&sc
->sc_tv_data_ready
);
490 o2net_sc_queue_work(sc
, &sc
->sc_rx_work
);
491 ready
= sc
->sc_data_ready
;
493 ready
= sk
->sk_data_ready
;
495 read_unlock(&sk
->sk_callback_lock
);
500 /* see o2net_register_callbacks() */
501 static void o2net_state_change(struct sock
*sk
)
503 void (*state_change
)(struct sock
*sk
);
504 struct o2net_sock_container
*sc
;
506 read_lock(&sk
->sk_callback_lock
);
507 sc
= sk
->sk_user_data
;
509 state_change
= sk
->sk_state_change
;
513 sclog(sc
, "state_change to %d\n", sk
->sk_state
);
515 state_change
= sc
->sc_state_change
;
517 switch(sk
->sk_state
) {
518 /* ignore connecting sockets as they make progress */
522 case TCP_ESTABLISHED
:
523 o2net_sc_queue_work(sc
, &sc
->sc_connect_work
);
526 o2net_sc_queue_work(sc
, &sc
->sc_shutdown_work
);
530 read_unlock(&sk
->sk_callback_lock
);
535 * we register callbacks so we can queue work on events before calling
536 * the original callbacks. our callbacks our careful to test user_data
537 * to discover when they've reaced with o2net_unregister_callbacks().
539 static void o2net_register_callbacks(struct sock
*sk
,
540 struct o2net_sock_container
*sc
)
542 write_lock_bh(&sk
->sk_callback_lock
);
544 /* accepted sockets inherit the old listen socket data ready */
545 if (sk
->sk_data_ready
== o2net_listen_data_ready
) {
546 sk
->sk_data_ready
= sk
->sk_user_data
;
547 sk
->sk_user_data
= NULL
;
550 BUG_ON(sk
->sk_user_data
!= NULL
);
551 sk
->sk_user_data
= sc
;
554 sc
->sc_data_ready
= sk
->sk_data_ready
;
555 sc
->sc_state_change
= sk
->sk_state_change
;
556 sk
->sk_data_ready
= o2net_data_ready
;
557 sk
->sk_state_change
= o2net_state_change
;
559 mutex_init(&sc
->sc_send_lock
);
561 write_unlock_bh(&sk
->sk_callback_lock
);
564 static int o2net_unregister_callbacks(struct sock
*sk
,
565 struct o2net_sock_container
*sc
)
569 write_lock_bh(&sk
->sk_callback_lock
);
570 if (sk
->sk_user_data
== sc
) {
572 sk
->sk_user_data
= NULL
;
573 sk
->sk_data_ready
= sc
->sc_data_ready
;
574 sk
->sk_state_change
= sc
->sc_state_change
;
576 write_unlock_bh(&sk
->sk_callback_lock
);
582 * this is a little helper that is called by callers who have seen a problem
583 * with an sc and want to detach it from the nn if someone already hasn't beat
584 * them to it. if an error is given then the shutdown will be persistent
585 * and pending transmits will be canceled.
587 static void o2net_ensure_shutdown(struct o2net_node
*nn
,
588 struct o2net_sock_container
*sc
,
591 spin_lock(&nn
->nn_lock
);
593 o2net_set_nn_state(nn
, NULL
, 0, err
);
594 spin_unlock(&nn
->nn_lock
);
598 * This work queue function performs the blocking parts of socket shutdown. A
599 * few paths lead here. set_nn_state will trigger this callback if it sees an
600 * sc detached from the nn. state_change will also trigger this callback
601 * directly when it sees errors. In that case we need to call set_nn_state
602 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
605 static void o2net_shutdown_sc(struct work_struct
*work
)
607 struct o2net_sock_container
*sc
=
608 container_of(work
, struct o2net_sock_container
,
610 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
612 sclog(sc
, "shutting down\n");
614 /* drop the callbacks ref and call shutdown only once */
615 if (o2net_unregister_callbacks(sc
->sc_sock
->sk
, sc
)) {
616 /* we shouldn't flush as we're in the thread, the
617 * races with pending sc work structs are harmless */
618 del_timer_sync(&sc
->sc_idle_timeout
);
619 o2net_sc_cancel_delayed_work(sc
, &sc
->sc_keepalive_work
);
621 sc
->sc_sock
->ops
->shutdown(sc
->sc_sock
,
622 RCV_SHUTDOWN
|SEND_SHUTDOWN
);
625 /* not fatal so failed connects before the other guy has our
626 * heartbeat can be retried */
627 o2net_ensure_shutdown(nn
, sc
, 0);
631 /* ------------------------------------------------------------ */
633 static int o2net_handler_cmp(struct o2net_msg_handler
*nmh
, u32 msg_type
,
636 int ret
= memcmp(&nmh
->nh_key
, &key
, sizeof(key
));
639 ret
= memcmp(&nmh
->nh_msg_type
, &msg_type
, sizeof(msg_type
));
644 static struct o2net_msg_handler
*
645 o2net_handler_tree_lookup(u32 msg_type
, u32 key
, struct rb_node
***ret_p
,
646 struct rb_node
**ret_parent
)
648 struct rb_node
**p
= &o2net_handler_tree
.rb_node
;
649 struct rb_node
*parent
= NULL
;
650 struct o2net_msg_handler
*nmh
, *ret
= NULL
;
655 nmh
= rb_entry(parent
, struct o2net_msg_handler
, nh_node
);
656 cmp
= o2net_handler_cmp(nmh
, msg_type
, key
);
670 if (ret_parent
!= NULL
)
671 *ret_parent
= parent
;
676 static void o2net_handler_kref_release(struct kref
*kref
)
678 struct o2net_msg_handler
*nmh
;
679 nmh
= container_of(kref
, struct o2net_msg_handler
, nh_kref
);
684 static void o2net_handler_put(struct o2net_msg_handler
*nmh
)
686 kref_put(&nmh
->nh_kref
, o2net_handler_kref_release
);
689 /* max_len is protection for the handler func. incoming messages won't
690 * be given to the handler if their payload is longer than the max. */
691 int o2net_register_handler(u32 msg_type
, u32 key
, u32 max_len
,
692 o2net_msg_handler_func
*func
, void *data
,
693 o2net_post_msg_handler_func
*post_func
,
694 struct list_head
*unreg_list
)
696 struct o2net_msg_handler
*nmh
= NULL
;
697 struct rb_node
**p
, *parent
;
700 if (max_len
> O2NET_MAX_PAYLOAD_BYTES
) {
701 mlog(0, "max_len for message handler out of range: %u\n",
708 mlog(0, "no message type provided: %u, %p\n", msg_type
, func
);
714 mlog(0, "no message handler provided: %u, %p\n",
720 nmh
= kzalloc(sizeof(struct o2net_msg_handler
), GFP_NOFS
);
727 nmh
->nh_func_data
= data
;
728 nmh
->nh_post_func
= post_func
;
729 nmh
->nh_msg_type
= msg_type
;
730 nmh
->nh_max_len
= max_len
;
732 /* the tree and list get this ref.. they're both removed in
733 * unregister when this ref is dropped */
734 kref_init(&nmh
->nh_kref
);
735 INIT_LIST_HEAD(&nmh
->nh_unregister_item
);
737 write_lock(&o2net_handler_lock
);
738 if (o2net_handler_tree_lookup(msg_type
, key
, &p
, &parent
))
741 rb_link_node(&nmh
->nh_node
, parent
, p
);
742 rb_insert_color(&nmh
->nh_node
, &o2net_handler_tree
);
743 list_add_tail(&nmh
->nh_unregister_item
, unreg_list
);
745 mlog(ML_TCP
, "registered handler func %p type %u key %08x\n",
746 func
, msg_type
, key
);
747 /* we've had some trouble with handlers seemingly vanishing. */
748 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type
, key
, &p
,
750 "couldn't find handler we *just* registerd "
751 "for type %u key %08x\n", msg_type
, key
);
753 write_unlock(&o2net_handler_lock
);
763 EXPORT_SYMBOL_GPL(o2net_register_handler
);
765 void o2net_unregister_handler_list(struct list_head
*list
)
767 struct list_head
*pos
, *n
;
768 struct o2net_msg_handler
*nmh
;
770 write_lock(&o2net_handler_lock
);
771 list_for_each_safe(pos
, n
, list
) {
772 nmh
= list_entry(pos
, struct o2net_msg_handler
,
774 mlog(ML_TCP
, "unregistering handler func %p type %u key %08x\n",
775 nmh
->nh_func
, nmh
->nh_msg_type
, nmh
->nh_key
);
776 rb_erase(&nmh
->nh_node
, &o2net_handler_tree
);
777 list_del_init(&nmh
->nh_unregister_item
);
778 kref_put(&nmh
->nh_kref
, o2net_handler_kref_release
);
780 write_unlock(&o2net_handler_lock
);
782 EXPORT_SYMBOL_GPL(o2net_unregister_handler_list
);
784 static struct o2net_msg_handler
*o2net_handler_get(u32 msg_type
, u32 key
)
786 struct o2net_msg_handler
*nmh
;
788 read_lock(&o2net_handler_lock
);
789 nmh
= o2net_handler_tree_lookup(msg_type
, key
, NULL
, NULL
);
791 kref_get(&nmh
->nh_kref
);
792 read_unlock(&o2net_handler_lock
);
797 /* ------------------------------------------------------------ */
799 static int o2net_recv_tcp_msg(struct socket
*sock
, void *data
, size_t len
)
807 struct msghdr msg
= {
809 .msg_iov
= (struct iovec
*)&vec
,
810 .msg_flags
= MSG_DONTWAIT
,
815 ret
= sock_recvmsg(sock
, &msg
, len
, msg
.msg_flags
);
821 static int o2net_send_tcp_msg(struct socket
*sock
, struct kvec
*vec
,
822 size_t veclen
, size_t total
)
826 struct msghdr msg
= {
827 .msg_iov
= (struct iovec
*)vec
,
828 .msg_iovlen
= veclen
,
838 ret
= sock_sendmsg(sock
, &msg
, total
);
841 mlog(ML_ERROR
, "sendmsg returned %d instead of %zu\n", ret
,
844 ret
= -EPIPE
; /* should be smarter, I bet */
851 mlog(0, "returning error: %d\n", ret
);
855 static void o2net_sendpage(struct o2net_sock_container
*sc
,
856 void *kmalloced_virt
,
859 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
863 mutex_lock(&sc
->sc_send_lock
);
864 ret
= sc
->sc_sock
->ops
->sendpage(sc
->sc_sock
,
865 virt_to_page(kmalloced_virt
),
866 (long)kmalloced_virt
& ~PAGE_MASK
,
868 mutex_unlock(&sc
->sc_send_lock
);
870 mlog(ML_ERROR
, "sendpage of size %zu to " SC_NODEF_FMT
871 " failed with %zd\n", size
, SC_NODEF_ARGS(sc
), ret
);
872 o2net_ensure_shutdown(nn
, sc
, 0);
876 static void o2net_init_msg(struct o2net_msg
*msg
, u16 data_len
, u16 msg_type
, u32 key
)
878 memset(msg
, 0, sizeof(struct o2net_msg
));
879 msg
->magic
= cpu_to_be16(O2NET_MSG_MAGIC
);
880 msg
->data_len
= cpu_to_be16(data_len
);
881 msg
->msg_type
= cpu_to_be16(msg_type
);
882 msg
->sys_status
= cpu_to_be32(O2NET_ERR_NONE
);
884 msg
->key
= cpu_to_be32(key
);
887 static int o2net_tx_can_proceed(struct o2net_node
*nn
,
888 struct o2net_sock_container
**sc_ret
,
893 spin_lock(&nn
->nn_lock
);
894 if (nn
->nn_persistent_error
) {
897 *error
= nn
->nn_persistent_error
;
898 } else if (nn
->nn_sc_valid
) {
899 kref_get(&nn
->nn_sc
->sc_kref
);
905 spin_unlock(&nn
->nn_lock
);
910 int o2net_send_message_vec(u32 msg_type
, u32 key
, struct kvec
*caller_vec
,
911 size_t caller_veclen
, u8 target_node
, int *status
)
914 struct o2net_msg
*msg
= NULL
;
915 size_t veclen
, caller_bytes
= 0;
916 struct kvec
*vec
= NULL
;
917 struct o2net_sock_container
*sc
= NULL
;
918 struct o2net_node
*nn
= o2net_nn_from_num(target_node
);
919 struct o2net_status_wait nsw
= {
920 .ns_node_item
= LIST_HEAD_INIT(nsw
.ns_node_item
),
923 if (o2net_wq
== NULL
) {
924 mlog(0, "attempt to tx without o2netd running\n");
929 if (caller_veclen
== 0) {
930 mlog(0, "bad kvec array length\n");
935 caller_bytes
= iov_length((struct iovec
*)caller_vec
, caller_veclen
);
936 if (caller_bytes
> O2NET_MAX_PAYLOAD_BYTES
) {
937 mlog(0, "total payload len %zu too large\n", caller_bytes
);
942 if (target_node
== o2nm_this_node()) {
947 ret
= wait_event_interruptible(nn
->nn_sc_wq
,
948 o2net_tx_can_proceed(nn
, &sc
, &error
));
954 veclen
= caller_veclen
+ 1;
955 vec
= kmalloc(sizeof(struct kvec
) * veclen
, GFP_ATOMIC
);
957 mlog(0, "failed to %zu element kvec!\n", veclen
);
962 msg
= kmalloc(sizeof(struct o2net_msg
), GFP_ATOMIC
);
964 mlog(0, "failed to allocate a o2net_msg!\n");
969 o2net_init_msg(msg
, caller_bytes
, msg_type
, key
);
971 vec
[0].iov_len
= sizeof(struct o2net_msg
);
972 vec
[0].iov_base
= msg
;
973 memcpy(&vec
[1], caller_vec
, caller_veclen
* sizeof(struct kvec
));
975 ret
= o2net_prep_nsw(nn
, &nsw
);
979 msg
->msg_num
= cpu_to_be32(nsw
.ns_id
);
981 /* finally, convert the message header to network byte-order
983 mutex_lock(&sc
->sc_send_lock
);
984 ret
= o2net_send_tcp_msg(sc
->sc_sock
, vec
, veclen
,
985 sizeof(struct o2net_msg
) + caller_bytes
);
986 mutex_unlock(&sc
->sc_send_lock
);
987 msglog(msg
, "sending returned %d\n", ret
);
989 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret
);
993 /* wait on other node's handler */
994 wait_event(nsw
.ns_wq
, o2net_nsw_completed(nn
, &nsw
));
996 /* Note that we avoid overwriting the callers status return
997 * variable if a system error was reported on the other
998 * side. Callers beware. */
999 ret
= o2net_sys_err_to_errno(nsw
.ns_sys_status
);
1001 *status
= nsw
.ns_status
;
1003 mlog(0, "woken, returning system status %d, user status %d\n",
1004 ret
, nsw
.ns_status
);
1012 o2net_complete_nsw(nn
, &nsw
, 0, 0, 0);
1015 EXPORT_SYMBOL_GPL(o2net_send_message_vec
);
1017 int o2net_send_message(u32 msg_type
, u32 key
, void *data
, u32 len
,
1018 u8 target_node
, int *status
)
1024 return o2net_send_message_vec(msg_type
, key
, &vec
, 1,
1025 target_node
, status
);
1027 EXPORT_SYMBOL_GPL(o2net_send_message
);
1029 static int o2net_send_status_magic(struct socket
*sock
, struct o2net_msg
*hdr
,
1030 enum o2net_system_error syserr
, int err
)
1034 .iov_len
= sizeof(struct o2net_msg
),
1037 BUG_ON(syserr
>= O2NET_ERR_MAX
);
1039 /* leave other fields intact from the incoming message, msg_num
1041 hdr
->sys_status
= cpu_to_be32(syserr
);
1042 hdr
->status
= cpu_to_be32(err
);
1043 hdr
->magic
= cpu_to_be16(O2NET_MSG_STATUS_MAGIC
); // twiddle the magic
1046 msglog(hdr
, "about to send status magic %d\n", err
);
1047 /* hdr has been in host byteorder this whole time */
1048 return o2net_send_tcp_msg(sock
, &vec
, 1, sizeof(struct o2net_msg
));
1051 /* this returns -errno if the header was unknown or too large, etc.
1052 * after this is called the buffer us reused for the next message */
1053 static int o2net_process_message(struct o2net_sock_container
*sc
,
1054 struct o2net_msg
*hdr
)
1056 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1057 int ret
= 0, handler_status
;
1058 enum o2net_system_error syserr
;
1059 struct o2net_msg_handler
*nmh
= NULL
;
1060 void *ret_data
= NULL
;
1062 msglog(hdr
, "processing message\n");
1064 o2net_sc_postpone_idle(sc
);
1066 switch(be16_to_cpu(hdr
->magic
)) {
1067 case O2NET_MSG_STATUS_MAGIC
:
1068 /* special type for returning message status */
1069 o2net_complete_nsw(nn
, NULL
,
1070 be32_to_cpu(hdr
->msg_num
),
1071 be32_to_cpu(hdr
->sys_status
),
1072 be32_to_cpu(hdr
->status
));
1074 case O2NET_MSG_KEEP_REQ_MAGIC
:
1075 o2net_sendpage(sc
, o2net_keep_resp
,
1076 sizeof(*o2net_keep_resp
));
1078 case O2NET_MSG_KEEP_RESP_MAGIC
:
1080 case O2NET_MSG_MAGIC
:
1083 msglog(hdr
, "bad magic\n");
1089 /* find a handler for it */
1091 nmh
= o2net_handler_get(be16_to_cpu(hdr
->msg_type
),
1092 be32_to_cpu(hdr
->key
));
1094 mlog(ML_TCP
, "couldn't find handler for type %u key %08x\n",
1095 be16_to_cpu(hdr
->msg_type
), be32_to_cpu(hdr
->key
));
1096 syserr
= O2NET_ERR_NO_HNDLR
;
1100 syserr
= O2NET_ERR_NONE
;
1102 if (be16_to_cpu(hdr
->data_len
) > nmh
->nh_max_len
)
1103 syserr
= O2NET_ERR_OVERFLOW
;
1105 if (syserr
!= O2NET_ERR_NONE
)
1108 do_gettimeofday(&sc
->sc_tv_func_start
);
1109 sc
->sc_msg_key
= be32_to_cpu(hdr
->key
);
1110 sc
->sc_msg_type
= be16_to_cpu(hdr
->msg_type
);
1111 handler_status
= (nmh
->nh_func
)(hdr
, sizeof(struct o2net_msg
) +
1112 be16_to_cpu(hdr
->data_len
),
1113 nmh
->nh_func_data
, &ret_data
);
1114 do_gettimeofday(&sc
->sc_tv_func_stop
);
1117 /* this destroys the hdr, so don't use it after this */
1118 mutex_lock(&sc
->sc_send_lock
);
1119 ret
= o2net_send_status_magic(sc
->sc_sock
, hdr
, syserr
,
1121 mutex_unlock(&sc
->sc_send_lock
);
1123 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1124 handler_status
, syserr
, ret
);
1127 BUG_ON(ret_data
!= NULL
&& nmh
->nh_post_func
== NULL
);
1128 if (nmh
->nh_post_func
)
1129 (nmh
->nh_post_func
)(handler_status
, nmh
->nh_func_data
,
1135 o2net_handler_put(nmh
);
1139 static int o2net_check_handshake(struct o2net_sock_container
*sc
)
1141 struct o2net_handshake
*hand
= page_address(sc
->sc_page
);
1142 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1144 if (hand
->protocol_version
!= cpu_to_be64(O2NET_PROTOCOL_VERSION
)) {
1145 mlog(ML_NOTICE
, SC_NODEF_FMT
" advertised net protocol "
1146 "version %llu but %llu is required, disconnecting\n",
1148 (unsigned long long)be64_to_cpu(hand
->protocol_version
),
1149 O2NET_PROTOCOL_VERSION
);
1151 /* don't bother reconnecting if its the wrong version. */
1152 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1157 * Ensure timeouts are consistent with other nodes, otherwise
1158 * we can end up with one node thinking that the other must be down,
1159 * but isn't. This can ultimately cause corruption.
1161 if (be32_to_cpu(hand
->o2net_idle_timeout_ms
) !=
1162 o2net_idle_timeout(sc
->sc_node
)) {
1163 mlog(ML_NOTICE
, SC_NODEF_FMT
" uses a network idle timeout of "
1164 "%u ms, but we use %u ms locally. disconnecting\n",
1166 be32_to_cpu(hand
->o2net_idle_timeout_ms
),
1167 o2net_idle_timeout(sc
->sc_node
));
1168 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1172 if (be32_to_cpu(hand
->o2net_keepalive_delay_ms
) !=
1173 o2net_keepalive_delay(sc
->sc_node
)) {
1174 mlog(ML_NOTICE
, SC_NODEF_FMT
" uses a keepalive delay of "
1175 "%u ms, but we use %u ms locally. disconnecting\n",
1177 be32_to_cpu(hand
->o2net_keepalive_delay_ms
),
1178 o2net_keepalive_delay(sc
->sc_node
));
1179 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1183 if (be32_to_cpu(hand
->o2hb_heartbeat_timeout_ms
) !=
1184 O2HB_MAX_WRITE_TIMEOUT_MS
) {
1185 mlog(ML_NOTICE
, SC_NODEF_FMT
" uses a heartbeat timeout of "
1186 "%u ms, but we use %u ms locally. disconnecting\n",
1188 be32_to_cpu(hand
->o2hb_heartbeat_timeout_ms
),
1189 O2HB_MAX_WRITE_TIMEOUT_MS
);
1190 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1194 sc
->sc_handshake_ok
= 1;
1196 spin_lock(&nn
->nn_lock
);
1197 /* set valid and queue the idle timers only if it hasn't been
1198 * shut down already */
1199 if (nn
->nn_sc
== sc
) {
1200 o2net_sc_reset_idle_timer(sc
);
1201 o2net_set_nn_state(nn
, sc
, 1, 0);
1203 spin_unlock(&nn
->nn_lock
);
1205 /* shift everything up as though it wasn't there */
1206 sc
->sc_page_off
-= sizeof(struct o2net_handshake
);
1207 if (sc
->sc_page_off
)
1208 memmove(hand
, hand
+ 1, sc
->sc_page_off
);
1213 /* this demuxes the queued rx bytes into header or payload bits and calls
1214 * handlers as each full message is read off the socket. it returns -error,
1215 * == 0 eof, or > 0 for progress made.*/
1216 static int o2net_advance_rx(struct o2net_sock_container
*sc
)
1218 struct o2net_msg
*hdr
;
1223 sclog(sc
, "receiving\n");
1224 do_gettimeofday(&sc
->sc_tv_advance_start
);
1226 if (unlikely(sc
->sc_handshake_ok
== 0)) {
1227 if(sc
->sc_page_off
< sizeof(struct o2net_handshake
)) {
1228 data
= page_address(sc
->sc_page
) + sc
->sc_page_off
;
1229 datalen
= sizeof(struct o2net_handshake
) - sc
->sc_page_off
;
1230 ret
= o2net_recv_tcp_msg(sc
->sc_sock
, data
, datalen
);
1232 sc
->sc_page_off
+= ret
;
1235 if (sc
->sc_page_off
== sizeof(struct o2net_handshake
)) {
1236 o2net_check_handshake(sc
);
1237 if (unlikely(sc
->sc_handshake_ok
== 0))
1243 /* do we need more header? */
1244 if (sc
->sc_page_off
< sizeof(struct o2net_msg
)) {
1245 data
= page_address(sc
->sc_page
) + sc
->sc_page_off
;
1246 datalen
= sizeof(struct o2net_msg
) - sc
->sc_page_off
;
1247 ret
= o2net_recv_tcp_msg(sc
->sc_sock
, data
, datalen
);
1249 sc
->sc_page_off
+= ret
;
1250 /* only swab incoming here.. we can
1251 * only get here once as we cross from
1252 * being under to over */
1253 if (sc
->sc_page_off
== sizeof(struct o2net_msg
)) {
1254 hdr
= page_address(sc
->sc_page
);
1255 if (be16_to_cpu(hdr
->data_len
) >
1256 O2NET_MAX_PAYLOAD_BYTES
)
1264 if (sc
->sc_page_off
< sizeof(struct o2net_msg
)) {
1265 /* oof, still don't have a header */
1269 /* this was swabbed above when we first read it */
1270 hdr
= page_address(sc
->sc_page
);
1272 msglog(hdr
, "at page_off %zu\n", sc
->sc_page_off
);
1274 /* do we need more payload? */
1275 if (sc
->sc_page_off
- sizeof(struct o2net_msg
) < be16_to_cpu(hdr
->data_len
)) {
1276 /* need more payload */
1277 data
= page_address(sc
->sc_page
) + sc
->sc_page_off
;
1278 datalen
= (sizeof(struct o2net_msg
) + be16_to_cpu(hdr
->data_len
)) -
1280 ret
= o2net_recv_tcp_msg(sc
->sc_sock
, data
, datalen
);
1282 sc
->sc_page_off
+= ret
;
1287 if (sc
->sc_page_off
- sizeof(struct o2net_msg
) == be16_to_cpu(hdr
->data_len
)) {
1288 /* we can only get here once, the first time we read
1289 * the payload.. so set ret to progress if the handler
1290 * works out. after calling this the message is toast */
1291 ret
= o2net_process_message(sc
, hdr
);
1294 sc
->sc_page_off
= 0;
1298 sclog(sc
, "ret = %d\n", ret
);
1299 do_gettimeofday(&sc
->sc_tv_advance_stop
);
1303 /* this work func is triggerd by data ready. it reads until it can read no
1304 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1305 * our work the work struct will be marked and we'll be called again. */
1306 static void o2net_rx_until_empty(struct work_struct
*work
)
1308 struct o2net_sock_container
*sc
=
1309 container_of(work
, struct o2net_sock_container
, sc_rx_work
);
1313 ret
= o2net_advance_rx(sc
);
1316 if (ret
<= 0 && ret
!= -EAGAIN
) {
1317 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1318 sclog(sc
, "saw error %d, closing\n", ret
);
1319 /* not permanent so read failed handshake can retry */
1320 o2net_ensure_shutdown(nn
, sc
, 0);
1326 static int o2net_set_nodelay(struct socket
*sock
)
1335 * Dear unsuspecting programmer,
1337 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1338 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1339 * silently turn into SO_DEBUG.
1342 * Keeper of hilariously fragile interfaces.
1344 ret
= sock
->ops
->setsockopt(sock
, SOL_TCP
, TCP_NODELAY
,
1345 (char __user
*)&val
, sizeof(val
));
1351 static void o2net_initialize_handshake(void)
1353 o2net_hand
->o2hb_heartbeat_timeout_ms
= cpu_to_be32(
1354 O2HB_MAX_WRITE_TIMEOUT_MS
);
1355 o2net_hand
->o2net_idle_timeout_ms
= cpu_to_be32(
1356 o2net_idle_timeout(NULL
));
1357 o2net_hand
->o2net_keepalive_delay_ms
= cpu_to_be32(
1358 o2net_keepalive_delay(NULL
));
1359 o2net_hand
->o2net_reconnect_delay_ms
= cpu_to_be32(
1360 o2net_reconnect_delay(NULL
));
1363 /* ------------------------------------------------------------ */
1365 /* called when a connect completes and after a sock is accepted. the
1366 * rx path will see the response and mark the sc valid */
1367 static void o2net_sc_connect_completed(struct work_struct
*work
)
1369 struct o2net_sock_container
*sc
=
1370 container_of(work
, struct o2net_sock_container
,
1373 mlog(ML_MSG
, "sc sending handshake with ver %llu id %llx\n",
1374 (unsigned long long)O2NET_PROTOCOL_VERSION
,
1375 (unsigned long long)be64_to_cpu(o2net_hand
->connector_id
));
1377 o2net_initialize_handshake();
1378 o2net_sendpage(sc
, o2net_hand
, sizeof(*o2net_hand
));
1382 /* this is called as a work_struct func. */
1383 static void o2net_sc_send_keep_req(struct work_struct
*work
)
1385 struct o2net_sock_container
*sc
=
1386 container_of(work
, struct o2net_sock_container
,
1387 sc_keepalive_work
.work
);
1389 o2net_sendpage(sc
, o2net_keep_req
, sizeof(*o2net_keep_req
));
1393 /* socket shutdown does a del_timer_sync against this as it tears down.
1394 * we can't start this timer until we've got to the point in sc buildup
1395 * where shutdown is going to be involved */
1396 static void o2net_idle_timer(unsigned long data
)
1398 struct o2net_sock_container
*sc
= (struct o2net_sock_container
*)data
;
1401 do_gettimeofday(&now
);
1403 printk(KERN_INFO
"o2net: connection to " SC_NODEF_FMT
" has been idle for %u.%u "
1404 "seconds, shutting it down.\n", SC_NODEF_ARGS(sc
),
1405 o2net_idle_timeout(sc
->sc_node
) / 1000,
1406 o2net_idle_timeout(sc
->sc_node
) % 1000);
1407 mlog(ML_NOTICE
, "here are some times that might help debug the "
1408 "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv "
1409 "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n",
1410 sc
->sc_tv_timer
.tv_sec
, (long) sc
->sc_tv_timer
.tv_usec
,
1411 now
.tv_sec
, (long) now
.tv_usec
,
1412 sc
->sc_tv_data_ready
.tv_sec
, (long) sc
->sc_tv_data_ready
.tv_usec
,
1413 sc
->sc_tv_advance_start
.tv_sec
,
1414 (long) sc
->sc_tv_advance_start
.tv_usec
,
1415 sc
->sc_tv_advance_stop
.tv_sec
,
1416 (long) sc
->sc_tv_advance_stop
.tv_usec
,
1417 sc
->sc_msg_key
, sc
->sc_msg_type
,
1418 sc
->sc_tv_func_start
.tv_sec
, (long) sc
->sc_tv_func_start
.tv_usec
,
1419 sc
->sc_tv_func_stop
.tv_sec
, (long) sc
->sc_tv_func_stop
.tv_usec
);
1421 o2net_sc_queue_work(sc
, &sc
->sc_shutdown_work
);
1424 static void o2net_sc_reset_idle_timer(struct o2net_sock_container
*sc
)
1426 o2net_sc_cancel_delayed_work(sc
, &sc
->sc_keepalive_work
);
1427 o2net_sc_queue_delayed_work(sc
, &sc
->sc_keepalive_work
,
1428 msecs_to_jiffies(o2net_keepalive_delay(sc
->sc_node
)));
1429 do_gettimeofday(&sc
->sc_tv_timer
);
1430 mod_timer(&sc
->sc_idle_timeout
,
1431 jiffies
+ msecs_to_jiffies(o2net_idle_timeout(sc
->sc_node
)));
1434 static void o2net_sc_postpone_idle(struct o2net_sock_container
*sc
)
1436 /* Only push out an existing timer */
1437 if (timer_pending(&sc
->sc_idle_timeout
))
1438 o2net_sc_reset_idle_timer(sc
);
1441 /* this work func is kicked whenever a path sets the nn state which doesn't
1442 * have valid set. This includes seeing hb come up, losing a connection,
1443 * having a connect attempt fail, etc. This centralizes the logic which decides
1444 * if a connect attempt should be made or if we should give up and all future
1445 * transmit attempts should fail */
1446 static void o2net_start_connect(struct work_struct
*work
)
1448 struct o2net_node
*nn
=
1449 container_of(work
, struct o2net_node
, nn_connect_work
.work
);
1450 struct o2net_sock_container
*sc
= NULL
;
1451 struct o2nm_node
*node
= NULL
, *mynode
= NULL
;
1452 struct socket
*sock
= NULL
;
1453 struct sockaddr_in myaddr
= {0, }, remoteaddr
= {0, };
1456 /* if we're greater we initiate tx, otherwise we accept */
1457 if (o2nm_this_node() <= o2net_num_from_nn(nn
))
1460 /* watch for racing with tearing a node down */
1461 node
= o2nm_get_node_by_num(o2net_num_from_nn(nn
));
1467 mynode
= o2nm_get_node_by_num(o2nm_this_node());
1468 if (mynode
== NULL
) {
1473 spin_lock(&nn
->nn_lock
);
1474 /* see if we already have one pending or have given up */
1475 stop
= (nn
->nn_sc
|| nn
->nn_persistent_error
);
1476 spin_unlock(&nn
->nn_lock
);
1480 nn
->nn_last_connect_attempt
= jiffies
;
1482 sc
= sc_alloc(node
);
1484 mlog(0, "couldn't allocate sc\n");
1489 ret
= sock_create(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
);
1491 mlog(0, "can't create socket: %d\n", ret
);
1494 sc
->sc_sock
= sock
; /* freed by sc_kref_release */
1496 sock
->sk
->sk_allocation
= GFP_ATOMIC
;
1498 myaddr
.sin_family
= AF_INET
;
1499 myaddr
.sin_addr
.s_addr
= mynode
->nd_ipv4_address
;
1500 myaddr
.sin_port
= (__force u16
)htons(0); /* any port */
1502 ret
= sock
->ops
->bind(sock
, (struct sockaddr
*)&myaddr
,
1505 mlog(ML_ERROR
, "bind failed with %d at address %u.%u.%u.%u\n",
1506 ret
, NIPQUAD(mynode
->nd_ipv4_address
));
1510 ret
= o2net_set_nodelay(sc
->sc_sock
);
1512 mlog(ML_ERROR
, "setting TCP_NODELAY failed with %d\n", ret
);
1516 o2net_register_callbacks(sc
->sc_sock
->sk
, sc
);
1518 spin_lock(&nn
->nn_lock
);
1519 /* handshake completion will set nn->nn_sc_valid */
1520 o2net_set_nn_state(nn
, sc
, 0, 0);
1521 spin_unlock(&nn
->nn_lock
);
1523 remoteaddr
.sin_family
= AF_INET
;
1524 remoteaddr
.sin_addr
.s_addr
= node
->nd_ipv4_address
;
1525 remoteaddr
.sin_port
= node
->nd_ipv4_port
;
1527 ret
= sc
->sc_sock
->ops
->connect(sc
->sc_sock
,
1528 (struct sockaddr
*)&remoteaddr
,
1531 if (ret
== -EINPROGRESS
)
1536 mlog(ML_NOTICE
, "connect attempt to " SC_NODEF_FMT
" failed "
1537 "with errno %d\n", SC_NODEF_ARGS(sc
), ret
);
1538 /* 0 err so that another will be queued and attempted
1539 * from set_nn_state */
1541 o2net_ensure_shutdown(nn
, sc
, 0);
1546 o2nm_node_put(node
);
1548 o2nm_node_put(mynode
);
1553 static void o2net_connect_expired(struct work_struct
*work
)
1555 struct o2net_node
*nn
=
1556 container_of(work
, struct o2net_node
, nn_connect_expired
.work
);
1558 spin_lock(&nn
->nn_lock
);
1559 if (!nn
->nn_sc_valid
) {
1560 struct o2nm_node
*node
= nn
->nn_sc
->sc_node
;
1561 mlog(ML_ERROR
, "no connection established with node %u after "
1562 "%u.%u seconds, giving up and returning errors.\n",
1563 o2net_num_from_nn(nn
),
1564 o2net_idle_timeout(node
) / 1000,
1565 o2net_idle_timeout(node
) % 1000);
1567 o2net_set_nn_state(nn
, NULL
, 0, -ENOTCONN
);
1569 spin_unlock(&nn
->nn_lock
);
1572 static void o2net_still_up(struct work_struct
*work
)
1574 struct o2net_node
*nn
=
1575 container_of(work
, struct o2net_node
, nn_still_up
.work
);
1577 o2quo_hb_still_up(o2net_num_from_nn(nn
));
1580 /* ------------------------------------------------------------ */
1582 void o2net_disconnect_node(struct o2nm_node
*node
)
1584 struct o2net_node
*nn
= o2net_nn_from_num(node
->nd_num
);
1586 /* don't reconnect until it's heartbeating again */
1587 spin_lock(&nn
->nn_lock
);
1588 o2net_set_nn_state(nn
, NULL
, 0, -ENOTCONN
);
1589 spin_unlock(&nn
->nn_lock
);
1592 cancel_delayed_work(&nn
->nn_connect_expired
);
1593 cancel_delayed_work(&nn
->nn_connect_work
);
1594 cancel_delayed_work(&nn
->nn_still_up
);
1595 flush_workqueue(o2net_wq
);
1599 static void o2net_hb_node_down_cb(struct o2nm_node
*node
, int node_num
,
1602 o2quo_hb_down(node_num
);
1604 if (node_num
!= o2nm_this_node())
1605 o2net_disconnect_node(node
);
1607 BUG_ON(atomic_read(&o2net_connected_peers
) < 0);
1610 static void o2net_hb_node_up_cb(struct o2nm_node
*node
, int node_num
,
1613 struct o2net_node
*nn
= o2net_nn_from_num(node_num
);
1615 o2quo_hb_up(node_num
);
1617 /* ensure an immediate connect attempt */
1618 nn
->nn_last_connect_attempt
= jiffies
-
1619 (msecs_to_jiffies(o2net_reconnect_delay(node
)) + 1);
1621 if (node_num
!= o2nm_this_node()) {
1622 /* heartbeat doesn't work unless a local node number is
1623 * configured and doing so brings up the o2net_wq, so we can
1625 queue_delayed_work(o2net_wq
, &nn
->nn_connect_expired
,
1626 msecs_to_jiffies(o2net_idle_timeout(node
)));
1628 /* believe it or not, accept and node hearbeating testing
1629 * can succeed for this node before we got here.. so
1630 * only use set_nn_state to clear the persistent error
1631 * if that hasn't already happened */
1632 spin_lock(&nn
->nn_lock
);
1633 if (nn
->nn_persistent_error
)
1634 o2net_set_nn_state(nn
, NULL
, 0, 0);
1635 spin_unlock(&nn
->nn_lock
);
1639 void o2net_unregister_hb_callbacks(void)
1641 o2hb_unregister_callback(&o2net_hb_up
);
1642 o2hb_unregister_callback(&o2net_hb_down
);
1645 int o2net_register_hb_callbacks(void)
1649 o2hb_setup_callback(&o2net_hb_down
, O2HB_NODE_DOWN_CB
,
1650 o2net_hb_node_down_cb
, NULL
, O2NET_HB_PRI
);
1651 o2hb_setup_callback(&o2net_hb_up
, O2HB_NODE_UP_CB
,
1652 o2net_hb_node_up_cb
, NULL
, O2NET_HB_PRI
);
1654 ret
= o2hb_register_callback(&o2net_hb_up
);
1656 ret
= o2hb_register_callback(&o2net_hb_down
);
1659 o2net_unregister_hb_callbacks();
1664 /* ------------------------------------------------------------ */
1666 static int o2net_accept_one(struct socket
*sock
)
1669 struct sockaddr_in sin
;
1670 struct socket
*new_sock
= NULL
;
1671 struct o2nm_node
*node
= NULL
;
1672 struct o2net_sock_container
*sc
= NULL
;
1673 struct o2net_node
*nn
;
1675 BUG_ON(sock
== NULL
);
1676 ret
= sock_create_lite(sock
->sk
->sk_family
, sock
->sk
->sk_type
,
1677 sock
->sk
->sk_protocol
, &new_sock
);
1681 new_sock
->type
= sock
->type
;
1682 new_sock
->ops
= sock
->ops
;
1683 ret
= sock
->ops
->accept(sock
, new_sock
, O_NONBLOCK
);
1687 new_sock
->sk
->sk_allocation
= GFP_ATOMIC
;
1689 ret
= o2net_set_nodelay(new_sock
);
1691 mlog(ML_ERROR
, "setting TCP_NODELAY failed with %d\n", ret
);
1696 ret
= new_sock
->ops
->getname(new_sock
, (struct sockaddr
*) &sin
,
1701 node
= o2nm_get_node_by_ip((__force __be32
)sin
.sin_addr
.s_addr
);
1703 mlog(ML_NOTICE
, "attempt to connect from unknown node at "
1704 "%u.%u.%u.%u:%d\n", NIPQUAD(sin
.sin_addr
.s_addr
),
1705 ntohs((__force __be16
)sin
.sin_port
));
1710 if (o2nm_this_node() > node
->nd_num
) {
1711 mlog(ML_NOTICE
, "unexpected connect attempted from a lower "
1712 "numbered node '%s' at " "%u.%u.%u.%u:%d with num %u\n",
1713 node
->nd_name
, NIPQUAD(sin
.sin_addr
.s_addr
),
1714 ntohs((__force __be16
)sin
.sin_port
), node
->nd_num
);
1719 /* this happens all the time when the other node sees our heartbeat
1720 * and tries to connect before we see their heartbeat */
1721 if (!o2hb_check_node_heartbeating_from_callback(node
->nd_num
)) {
1722 mlog(ML_CONN
, "attempt to connect from node '%s' at "
1723 "%u.%u.%u.%u:%d but it isn't heartbeating\n",
1724 node
->nd_name
, NIPQUAD(sin
.sin_addr
.s_addr
),
1725 ntohs((__force __be16
)sin
.sin_port
));
1730 nn
= o2net_nn_from_num(node
->nd_num
);
1732 spin_lock(&nn
->nn_lock
);
1737 spin_unlock(&nn
->nn_lock
);
1739 mlog(ML_NOTICE
, "attempt to connect from node '%s' at "
1740 "%u.%u.%u.%u:%d but it already has an open connection\n",
1741 node
->nd_name
, NIPQUAD(sin
.sin_addr
.s_addr
),
1742 ntohs((__force __be16
)sin
.sin_port
));
1746 sc
= sc_alloc(node
);
1752 sc
->sc_sock
= new_sock
;
1755 spin_lock(&nn
->nn_lock
);
1756 o2net_set_nn_state(nn
, sc
, 0, 0);
1757 spin_unlock(&nn
->nn_lock
);
1759 o2net_register_callbacks(sc
->sc_sock
->sk
, sc
);
1760 o2net_sc_queue_work(sc
, &sc
->sc_rx_work
);
1762 o2net_initialize_handshake();
1763 o2net_sendpage(sc
, o2net_hand
, sizeof(*o2net_hand
));
1767 sock_release(new_sock
);
1769 o2nm_node_put(node
);
1775 static void o2net_accept_many(struct work_struct
*work
)
1777 struct socket
*sock
= o2net_listen_sock
;
1778 while (o2net_accept_one(sock
) == 0)
1782 static void o2net_listen_data_ready(struct sock
*sk
, int bytes
)
1784 void (*ready
)(struct sock
*sk
, int bytes
);
1786 read_lock(&sk
->sk_callback_lock
);
1787 ready
= sk
->sk_user_data
;
1788 if (ready
== NULL
) { /* check for teardown race */
1789 ready
= sk
->sk_data_ready
;
1793 /* ->sk_data_ready is also called for a newly established child socket
1794 * before it has been accepted and the acceptor has set up their
1795 * data_ready.. we only want to queue listen work for our listening
1797 if (sk
->sk_state
== TCP_LISTEN
) {
1798 mlog(ML_TCP
, "bytes: %d\n", bytes
);
1799 queue_work(o2net_wq
, &o2net_listen_work
);
1803 read_unlock(&sk
->sk_callback_lock
);
1807 static int o2net_open_listening_sock(__be32 addr
, __be16 port
)
1809 struct socket
*sock
= NULL
;
1811 struct sockaddr_in sin
= {
1812 .sin_family
= PF_INET
,
1813 .sin_addr
= { .s_addr
= addr
},
1817 ret
= sock_create(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
);
1819 mlog(ML_ERROR
, "unable to create socket, ret=%d\n", ret
);
1823 sock
->sk
->sk_allocation
= GFP_ATOMIC
;
1825 write_lock_bh(&sock
->sk
->sk_callback_lock
);
1826 sock
->sk
->sk_user_data
= sock
->sk
->sk_data_ready
;
1827 sock
->sk
->sk_data_ready
= o2net_listen_data_ready
;
1828 write_unlock_bh(&sock
->sk
->sk_callback_lock
);
1830 o2net_listen_sock
= sock
;
1831 INIT_WORK(&o2net_listen_work
, o2net_accept_many
);
1833 sock
->sk
->sk_reuse
= 1;
1834 ret
= sock
->ops
->bind(sock
, (struct sockaddr
*)&sin
, sizeof(sin
));
1836 mlog(ML_ERROR
, "unable to bind socket at %u.%u.%u.%u:%u, "
1837 "ret=%d\n", NIPQUAD(addr
), ntohs(port
), ret
);
1841 ret
= sock
->ops
->listen(sock
, 64);
1843 mlog(ML_ERROR
, "unable to listen on %u.%u.%u.%u:%u, ret=%d\n",
1844 NIPQUAD(addr
), ntohs(port
), ret
);
1849 o2net_listen_sock
= NULL
;
1857 * called from node manager when we should bring up our network listening
1858 * socket. node manager handles all the serialization to only call this
1859 * once and to match it with o2net_stop_listening(). note,
1860 * o2nm_this_node() doesn't work yet as we're being called while it
1863 int o2net_start_listening(struct o2nm_node
*node
)
1867 BUG_ON(o2net_wq
!= NULL
);
1868 BUG_ON(o2net_listen_sock
!= NULL
);
1870 mlog(ML_KTHREAD
, "starting o2net thread...\n");
1871 o2net_wq
= create_singlethread_workqueue("o2net");
1872 if (o2net_wq
== NULL
) {
1873 mlog(ML_ERROR
, "unable to launch o2net thread\n");
1874 return -ENOMEM
; /* ? */
1877 ret
= o2net_open_listening_sock(node
->nd_ipv4_address
,
1878 node
->nd_ipv4_port
);
1880 destroy_workqueue(o2net_wq
);
1883 o2quo_conn_up(node
->nd_num
);
1888 /* again, o2nm_this_node() doesn't work here as we're involved in
1889 * tearing it down */
1890 void o2net_stop_listening(struct o2nm_node
*node
)
1892 struct socket
*sock
= o2net_listen_sock
;
1895 BUG_ON(o2net_wq
== NULL
);
1896 BUG_ON(o2net_listen_sock
== NULL
);
1898 /* stop the listening socket from generating work */
1899 write_lock_bh(&sock
->sk
->sk_callback_lock
);
1900 sock
->sk
->sk_data_ready
= sock
->sk
->sk_user_data
;
1901 sock
->sk
->sk_user_data
= NULL
;
1902 write_unlock_bh(&sock
->sk
->sk_callback_lock
);
1904 for (i
= 0; i
< ARRAY_SIZE(o2net_nodes
); i
++) {
1905 struct o2nm_node
*node
= o2nm_get_node_by_num(i
);
1907 o2net_disconnect_node(node
);
1908 o2nm_node_put(node
);
1912 /* finish all work and tear down the work queue */
1913 mlog(ML_KTHREAD
, "waiting for o2net thread to exit....\n");
1914 destroy_workqueue(o2net_wq
);
1917 sock_release(o2net_listen_sock
);
1918 o2net_listen_sock
= NULL
;
1920 o2quo_conn_err(node
->nd_num
);
1923 /* ------------------------------------------------------------ */
1925 int o2net_init(void)
1931 o2net_hand
= kzalloc(sizeof(struct o2net_handshake
), GFP_KERNEL
);
1932 o2net_keep_req
= kzalloc(sizeof(struct o2net_msg
), GFP_KERNEL
);
1933 o2net_keep_resp
= kzalloc(sizeof(struct o2net_msg
), GFP_KERNEL
);
1934 if (!o2net_hand
|| !o2net_keep_req
|| !o2net_keep_resp
) {
1936 kfree(o2net_keep_req
);
1937 kfree(o2net_keep_resp
);
1941 o2net_hand
->protocol_version
= cpu_to_be64(O2NET_PROTOCOL_VERSION
);
1942 o2net_hand
->connector_id
= cpu_to_be64(1);
1944 o2net_keep_req
->magic
= cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC
);
1945 o2net_keep_resp
->magic
= cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC
);
1947 for (i
= 0; i
< ARRAY_SIZE(o2net_nodes
); i
++) {
1948 struct o2net_node
*nn
= o2net_nn_from_num(i
);
1950 spin_lock_init(&nn
->nn_lock
);
1951 INIT_DELAYED_WORK(&nn
->nn_connect_work
, o2net_start_connect
);
1952 INIT_DELAYED_WORK(&nn
->nn_connect_expired
,
1953 o2net_connect_expired
);
1954 INIT_DELAYED_WORK(&nn
->nn_still_up
, o2net_still_up
);
1955 /* until we see hb from a node we'll return einval */
1956 nn
->nn_persistent_error
= -ENOTCONN
;
1957 init_waitqueue_head(&nn
->nn_sc_wq
);
1958 idr_init(&nn
->nn_status_idr
);
1959 INIT_LIST_HEAD(&nn
->nn_status_list
);
1965 void o2net_exit(void)
1969 kfree(o2net_keep_req
);
1970 kfree(o2net_keep_resp
);