1 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
5 * Copyright (C) 2004 Oracle. All rights reserved.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public
18 * License along with this program; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 021110-1307, USA.
24 * Callers for this were originally written against a very simple synchronus
25 * API. This implementation reflects those simple callers. Some day I'm sure
26 * we'll need to move to a more robust posting/callback mechanism.
28 * Transmit calls pass in kernel virtual addresses and block copying this into
29 * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting
30 * for a failed socket to timeout. TX callers can also pass in a poniter to an
31 * 'int' which gets filled with an errno off the wire in response to the
34 * Handlers for unsolicited messages are registered. Each socket has a page
35 * that incoming data is copied into. First the header, then the data.
36 * Handlers are called from only one thread with a reference to this per-socket
37 * page. This page is destroyed after the handler call, so it can't be
38 * referenced beyond the call. Handlers may block but are discouraged from
41 * Any framing errors (bad magic, large payload lengths) close a connection.
43 * Our sock_container holds the state we associate with a socket. It's current
44 * framing state is held there as well as the refcounting we do around when it
45 * is safe to tear down the socket. The socket is only finally torn down from
46 * the container when the container loses all of its references -- so as long
47 * as you hold a ref on the container you can trust that the socket is valid
48 * for use with kernel socket APIs.
50 * Connections are initiated between a pair of nodes when the node with the
51 * higher node number gets a heartbeat callback which indicates that the lower
52 * numbered node has started heartbeating. The lower numbered node is passive
53 * and only accepts the connection if the higher numbered node is heartbeating.
56 #include <linux/kernel.h>
57 #include <linux/jiffies.h>
58 #include <linux/slab.h>
59 #include <linux/idr.h>
60 #include <linux/kref.h>
61 #include <linux/net.h>
62 #include <linux/export.h>
65 #include <asm/uaccess.h>
67 #include "heartbeat.h"
69 #include "nodemanager.h"
70 #define MLOG_MASK_PREFIX ML_TCP
74 #include "tcp_internal.h"
76 #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
77 #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
78 &sc->sc_node->nd_ipv4_address, \
79 ntohs(sc->sc_node->nd_ipv4_port)
82 * In the following two log macros, the whitespace after the ',' just
83 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
84 * previous token if args expands to nothing.
86 #define msglog(hdr, fmt, args...) do { \
87 typeof(hdr) __hdr = (hdr); \
88 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
89 "key %08x num %u] " fmt, \
90 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
91 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
92 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
93 be32_to_cpu(__hdr->msg_num) , ##args); \
96 #define sclog(sc, fmt, args...) do { \
97 typeof(sc) __sc = (sc); \
98 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
99 "pg_off %zu] " fmt, __sc, \
100 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
101 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
105 static DEFINE_RWLOCK(o2net_handler_lock
);
106 static struct rb_root o2net_handler_tree
= RB_ROOT
;
108 static struct o2net_node o2net_nodes
[O2NM_MAX_NODES
];
110 /* XXX someday we'll need better accounting */
111 static struct socket
*o2net_listen_sock
= NULL
;
114 * listen work is only queued by the listening socket callbacks on the
115 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
116 * quorum work is queued as sock containers are shutdown.. stop_listening
117 * tears down all the node's sock containers, preventing future shutdowns
118 * and queued quroum work, before canceling delayed quorum work and
119 * destroying the work queue.
121 static struct workqueue_struct
*o2net_wq
;
122 static struct work_struct o2net_listen_work
;
124 static struct o2hb_callback_func o2net_hb_up
, o2net_hb_down
;
125 #define O2NET_HB_PRI 0x1
127 static struct o2net_handshake
*o2net_hand
;
128 static struct o2net_msg
*o2net_keep_req
, *o2net_keep_resp
;
130 static int o2net_sys_err_translations
[O2NET_ERR_MAX
] =
131 {[O2NET_ERR_NONE
] = 0,
132 [O2NET_ERR_NO_HNDLR
] = -ENOPROTOOPT
,
133 [O2NET_ERR_OVERFLOW
] = -EOVERFLOW
,
134 [O2NET_ERR_DIED
] = -EHOSTDOWN
,};
136 /* can't quite avoid *all* internal declarations :/ */
137 static void o2net_sc_connect_completed(struct work_struct
*work
);
138 static void o2net_rx_until_empty(struct work_struct
*work
);
139 static void o2net_shutdown_sc(struct work_struct
*work
);
140 static void o2net_listen_data_ready(struct sock
*sk
, int bytes
);
141 static void o2net_sc_send_keep_req(struct work_struct
*work
);
142 static void o2net_idle_timer(unsigned long data
);
143 static void o2net_sc_postpone_idle(struct o2net_sock_container
*sc
);
144 static void o2net_sc_reset_idle_timer(struct o2net_sock_container
*sc
);
146 #ifdef CONFIG_DEBUG_FS
147 static void o2net_init_nst(struct o2net_send_tracking
*nst
, u32 msgtype
,
148 u32 msgkey
, struct task_struct
*task
, u8 node
)
150 INIT_LIST_HEAD(&nst
->st_net_debug_item
);
152 nst
->st_msg_type
= msgtype
;
153 nst
->st_msg_key
= msgkey
;
157 static inline void o2net_set_nst_sock_time(struct o2net_send_tracking
*nst
)
159 nst
->st_sock_time
= ktime_get();
162 static inline void o2net_set_nst_send_time(struct o2net_send_tracking
*nst
)
164 nst
->st_send_time
= ktime_get();
167 static inline void o2net_set_nst_status_time(struct o2net_send_tracking
*nst
)
169 nst
->st_status_time
= ktime_get();
172 static inline void o2net_set_nst_sock_container(struct o2net_send_tracking
*nst
,
173 struct o2net_sock_container
*sc
)
178 static inline void o2net_set_nst_msg_id(struct o2net_send_tracking
*nst
,
184 static inline void o2net_set_sock_timer(struct o2net_sock_container
*sc
)
186 sc
->sc_tv_timer
= ktime_get();
189 static inline void o2net_set_data_ready_time(struct o2net_sock_container
*sc
)
191 sc
->sc_tv_data_ready
= ktime_get();
194 static inline void o2net_set_advance_start_time(struct o2net_sock_container
*sc
)
196 sc
->sc_tv_advance_start
= ktime_get();
199 static inline void o2net_set_advance_stop_time(struct o2net_sock_container
*sc
)
201 sc
->sc_tv_advance_stop
= ktime_get();
204 static inline void o2net_set_func_start_time(struct o2net_sock_container
*sc
)
206 sc
->sc_tv_func_start
= ktime_get();
209 static inline void o2net_set_func_stop_time(struct o2net_sock_container
*sc
)
211 sc
->sc_tv_func_stop
= ktime_get();
214 #else /* CONFIG_DEBUG_FS */
215 # define o2net_init_nst(a, b, c, d, e)
216 # define o2net_set_nst_sock_time(a)
217 # define o2net_set_nst_send_time(a)
218 # define o2net_set_nst_status_time(a)
219 # define o2net_set_nst_sock_container(a, b)
220 # define o2net_set_nst_msg_id(a, b)
221 # define o2net_set_sock_timer(a)
222 # define o2net_set_data_ready_time(a)
223 # define o2net_set_advance_start_time(a)
224 # define o2net_set_advance_stop_time(a)
225 # define o2net_set_func_start_time(a)
226 # define o2net_set_func_stop_time(a)
227 #endif /* CONFIG_DEBUG_FS */
229 #ifdef CONFIG_OCFS2_FS_STATS
230 static ktime_t
o2net_get_func_run_time(struct o2net_sock_container
*sc
)
232 return ktime_sub(sc
->sc_tv_func_stop
, sc
->sc_tv_func_start
);
235 static void o2net_update_send_stats(struct o2net_send_tracking
*nst
,
236 struct o2net_sock_container
*sc
)
238 sc
->sc_tv_status_total
= ktime_add(sc
->sc_tv_status_total
,
239 ktime_sub(ktime_get(),
240 nst
->st_status_time
));
241 sc
->sc_tv_send_total
= ktime_add(sc
->sc_tv_send_total
,
242 ktime_sub(nst
->st_status_time
,
244 sc
->sc_tv_acquiry_total
= ktime_add(sc
->sc_tv_acquiry_total
,
245 ktime_sub(nst
->st_send_time
,
250 static void o2net_update_recv_stats(struct o2net_sock_container
*sc
)
252 sc
->sc_tv_process_total
= ktime_add(sc
->sc_tv_process_total
,
253 o2net_get_func_run_time(sc
));
259 # define o2net_update_send_stats(a, b)
261 # define o2net_update_recv_stats(sc)
263 #endif /* CONFIG_OCFS2_FS_STATS */
265 static inline int o2net_reconnect_delay(void)
267 return o2nm_single_cluster
->cl_reconnect_delay_ms
;
270 static inline int o2net_keepalive_delay(void)
272 return o2nm_single_cluster
->cl_keepalive_delay_ms
;
275 static inline int o2net_idle_timeout(void)
277 return o2nm_single_cluster
->cl_idle_timeout_ms
;
280 static inline int o2net_sys_err_to_errno(enum o2net_system_error err
)
283 BUG_ON(err
>= O2NET_ERR_MAX
);
284 trans
= o2net_sys_err_translations
[err
];
286 /* Just in case we mess up the translation table above */
287 BUG_ON(err
!= O2NET_ERR_NONE
&& trans
== 0);
291 static struct o2net_node
* o2net_nn_from_num(u8 node_num
)
293 BUG_ON(node_num
>= ARRAY_SIZE(o2net_nodes
));
294 return &o2net_nodes
[node_num
];
297 static u8
o2net_num_from_nn(struct o2net_node
*nn
)
300 return nn
- o2net_nodes
;
303 /* ------------------------------------------------------------ */
305 static int o2net_prep_nsw(struct o2net_node
*nn
, struct o2net_status_wait
*nsw
)
310 if (!idr_pre_get(&nn
->nn_status_idr
, GFP_ATOMIC
)) {
314 spin_lock(&nn
->nn_lock
);
315 ret
= idr_get_new(&nn
->nn_status_idr
, nsw
, &nsw
->ns_id
);
317 list_add_tail(&nsw
->ns_node_item
,
318 &nn
->nn_status_list
);
319 spin_unlock(&nn
->nn_lock
);
320 } while (ret
== -EAGAIN
);
323 init_waitqueue_head(&nsw
->ns_wq
);
324 nsw
->ns_sys_status
= O2NET_ERR_NONE
;
331 static void o2net_complete_nsw_locked(struct o2net_node
*nn
,
332 struct o2net_status_wait
*nsw
,
333 enum o2net_system_error sys_status
,
336 assert_spin_locked(&nn
->nn_lock
);
338 if (!list_empty(&nsw
->ns_node_item
)) {
339 list_del_init(&nsw
->ns_node_item
);
340 nsw
->ns_sys_status
= sys_status
;
341 nsw
->ns_status
= status
;
342 idr_remove(&nn
->nn_status_idr
, nsw
->ns_id
);
343 wake_up(&nsw
->ns_wq
);
347 static void o2net_complete_nsw(struct o2net_node
*nn
,
348 struct o2net_status_wait
*nsw
,
349 u64 id
, enum o2net_system_error sys_status
,
352 spin_lock(&nn
->nn_lock
);
357 nsw
= idr_find(&nn
->nn_status_idr
, id
);
362 o2net_complete_nsw_locked(nn
, nsw
, sys_status
, status
);
365 spin_unlock(&nn
->nn_lock
);
369 static void o2net_complete_nodes_nsw(struct o2net_node
*nn
)
371 struct o2net_status_wait
*nsw
, *tmp
;
372 unsigned int num_kills
= 0;
374 assert_spin_locked(&nn
->nn_lock
);
376 list_for_each_entry_safe(nsw
, tmp
, &nn
->nn_status_list
, ns_node_item
) {
377 o2net_complete_nsw_locked(nn
, nsw
, O2NET_ERR_DIED
, 0);
381 mlog(0, "completed %d messages for node %u\n", num_kills
,
382 o2net_num_from_nn(nn
));
385 static int o2net_nsw_completed(struct o2net_node
*nn
,
386 struct o2net_status_wait
*nsw
)
389 spin_lock(&nn
->nn_lock
);
390 completed
= list_empty(&nsw
->ns_node_item
);
391 spin_unlock(&nn
->nn_lock
);
395 /* ------------------------------------------------------------ */
397 static void sc_kref_release(struct kref
*kref
)
399 struct o2net_sock_container
*sc
= container_of(kref
,
400 struct o2net_sock_container
, sc_kref
);
401 BUG_ON(timer_pending(&sc
->sc_idle_timeout
));
403 sclog(sc
, "releasing\n");
406 sock_release(sc
->sc_sock
);
410 o2nm_undepend_item(&sc
->sc_node
->nd_item
);
411 o2nm_node_put(sc
->sc_node
);
414 o2net_debug_del_sc(sc
);
418 static void sc_put(struct o2net_sock_container
*sc
)
421 kref_put(&sc
->sc_kref
, sc_kref_release
);
423 static void sc_get(struct o2net_sock_container
*sc
)
426 kref_get(&sc
->sc_kref
);
428 static struct o2net_sock_container
*sc_alloc(struct o2nm_node
*node
)
430 struct o2net_sock_container
*sc
, *ret
= NULL
;
431 struct page
*page
= NULL
;
434 page
= alloc_page(GFP_NOFS
);
435 sc
= kzalloc(sizeof(*sc
), GFP_NOFS
);
436 if (sc
== NULL
|| page
== NULL
)
439 kref_init(&sc
->sc_kref
);
443 /* pin the node item of the remote node */
444 status
= o2nm_depend_item(&node
->nd_item
);
450 INIT_WORK(&sc
->sc_connect_work
, o2net_sc_connect_completed
);
451 INIT_WORK(&sc
->sc_rx_work
, o2net_rx_until_empty
);
452 INIT_WORK(&sc
->sc_shutdown_work
, o2net_shutdown_sc
);
453 INIT_DELAYED_WORK(&sc
->sc_keepalive_work
, o2net_sc_send_keep_req
);
455 init_timer(&sc
->sc_idle_timeout
);
456 sc
->sc_idle_timeout
.function
= o2net_idle_timer
;
457 sc
->sc_idle_timeout
.data
= (unsigned long)sc
;
459 sclog(sc
, "alloced\n");
463 o2net_debug_add_sc(sc
);
475 /* ------------------------------------------------------------ */
477 static void o2net_sc_queue_work(struct o2net_sock_container
*sc
,
478 struct work_struct
*work
)
481 if (!queue_work(o2net_wq
, work
))
484 static void o2net_sc_queue_delayed_work(struct o2net_sock_container
*sc
,
485 struct delayed_work
*work
,
489 if (!queue_delayed_work(o2net_wq
, work
, delay
))
492 static void o2net_sc_cancel_delayed_work(struct o2net_sock_container
*sc
,
493 struct delayed_work
*work
)
495 if (cancel_delayed_work(work
))
499 static atomic_t o2net_connected_peers
= ATOMIC_INIT(0);
501 int o2net_num_connected_peers(void)
503 return atomic_read(&o2net_connected_peers
);
506 static void o2net_set_nn_state(struct o2net_node
*nn
,
507 struct o2net_sock_container
*sc
,
508 unsigned valid
, int err
)
510 int was_valid
= nn
->nn_sc_valid
;
511 int was_err
= nn
->nn_persistent_error
;
512 struct o2net_sock_container
*old_sc
= nn
->nn_sc
;
514 assert_spin_locked(&nn
->nn_lock
);
517 atomic_dec(&o2net_connected_peers
);
518 else if (!old_sc
&& sc
)
519 atomic_inc(&o2net_connected_peers
);
521 /* the node num comparison and single connect/accept path should stop
522 * an non-null sc from being overwritten with another */
523 BUG_ON(sc
&& nn
->nn_sc
&& nn
->nn_sc
!= sc
);
524 mlog_bug_on_msg(err
&& valid
, "err %d valid %u\n", err
, valid
);
525 mlog_bug_on_msg(valid
&& !sc
, "valid %u sc %p\n", valid
, sc
);
527 if (was_valid
&& !valid
&& err
== 0)
530 mlog(ML_CONN
, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
531 o2net_num_from_nn(nn
), nn
->nn_sc
, sc
, nn
->nn_sc_valid
, valid
,
532 nn
->nn_persistent_error
, err
);
535 nn
->nn_sc_valid
= valid
? 1 : 0;
536 nn
->nn_persistent_error
= err
;
538 /* mirrors o2net_tx_can_proceed() */
539 if (nn
->nn_persistent_error
|| nn
->nn_sc_valid
)
540 wake_up(&nn
->nn_sc_wq
);
542 if (!was_err
&& nn
->nn_persistent_error
) {
543 o2quo_conn_err(o2net_num_from_nn(nn
));
544 queue_delayed_work(o2net_wq
, &nn
->nn_still_up
,
545 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS
));
548 if (was_valid
&& !valid
) {
549 printk(KERN_NOTICE
"o2net: No longer connected to "
550 SC_NODEF_FMT
"\n", SC_NODEF_ARGS(old_sc
));
551 o2net_complete_nodes_nsw(nn
);
554 if (!was_valid
&& valid
) {
555 o2quo_conn_up(o2net_num_from_nn(nn
));
556 cancel_delayed_work(&nn
->nn_connect_expired
);
557 printk(KERN_NOTICE
"o2net: %s " SC_NODEF_FMT
"\n",
558 o2nm_this_node() > sc
->sc_node
->nd_num
?
559 "Connected to" : "Accepted connection from",
563 /* trigger the connecting worker func as long as we're not valid,
564 * it will back off if it shouldn't connect. This can be called
565 * from node config teardown and so needs to be careful about
566 * the work queue actually being up. */
567 if (!valid
&& o2net_wq
) {
569 /* delay if we're within a RECONNECT_DELAY of the
571 delay
= (nn
->nn_last_connect_attempt
+
572 msecs_to_jiffies(o2net_reconnect_delay()))
574 if (delay
> msecs_to_jiffies(o2net_reconnect_delay()))
576 mlog(ML_CONN
, "queueing conn attempt in %lu jiffies\n", delay
);
577 queue_delayed_work(o2net_wq
, &nn
->nn_connect_work
, delay
);
580 * Delay the expired work after idle timeout.
582 * We might have lots of failed connection attempts that run
583 * through here but we only cancel the connect_expired work when
584 * a connection attempt succeeds. So only the first enqueue of
585 * the connect_expired work will do anything. The rest will see
586 * that it's already queued and do nothing.
588 delay
+= msecs_to_jiffies(o2net_idle_timeout());
589 queue_delayed_work(o2net_wq
, &nn
->nn_connect_expired
, delay
);
592 /* keep track of the nn's sc ref for the caller */
593 if ((old_sc
== NULL
) && sc
)
595 if (old_sc
&& (old_sc
!= sc
)) {
596 o2net_sc_queue_work(old_sc
, &old_sc
->sc_shutdown_work
);
601 /* see o2net_register_callbacks() */
602 static void o2net_data_ready(struct sock
*sk
, int bytes
)
604 void (*ready
)(struct sock
*sk
, int bytes
);
606 read_lock(&sk
->sk_callback_lock
);
607 if (sk
->sk_user_data
) {
608 struct o2net_sock_container
*sc
= sk
->sk_user_data
;
609 sclog(sc
, "data_ready hit\n");
610 o2net_set_data_ready_time(sc
);
611 o2net_sc_queue_work(sc
, &sc
->sc_rx_work
);
612 ready
= sc
->sc_data_ready
;
614 ready
= sk
->sk_data_ready
;
616 read_unlock(&sk
->sk_callback_lock
);
621 /* see o2net_register_callbacks() */
622 static void o2net_state_change(struct sock
*sk
)
624 void (*state_change
)(struct sock
*sk
);
625 struct o2net_sock_container
*sc
;
627 read_lock(&sk
->sk_callback_lock
);
628 sc
= sk
->sk_user_data
;
630 state_change
= sk
->sk_state_change
;
634 sclog(sc
, "state_change to %d\n", sk
->sk_state
);
636 state_change
= sc
->sc_state_change
;
638 switch(sk
->sk_state
) {
639 /* ignore connecting sockets as they make progress */
643 case TCP_ESTABLISHED
:
644 o2net_sc_queue_work(sc
, &sc
->sc_connect_work
);
647 printk(KERN_INFO
"o2net: Connection to " SC_NODEF_FMT
648 " shutdown, state %d\n",
649 SC_NODEF_ARGS(sc
), sk
->sk_state
);
650 o2net_sc_queue_work(sc
, &sc
->sc_shutdown_work
);
654 read_unlock(&sk
->sk_callback_lock
);
659 * we register callbacks so we can queue work on events before calling
660 * the original callbacks. our callbacks our careful to test user_data
661 * to discover when they've reaced with o2net_unregister_callbacks().
663 static void o2net_register_callbacks(struct sock
*sk
,
664 struct o2net_sock_container
*sc
)
666 write_lock_bh(&sk
->sk_callback_lock
);
668 /* accepted sockets inherit the old listen socket data ready */
669 if (sk
->sk_data_ready
== o2net_listen_data_ready
) {
670 sk
->sk_data_ready
= sk
->sk_user_data
;
671 sk
->sk_user_data
= NULL
;
674 BUG_ON(sk
->sk_user_data
!= NULL
);
675 sk
->sk_user_data
= sc
;
678 sc
->sc_data_ready
= sk
->sk_data_ready
;
679 sc
->sc_state_change
= sk
->sk_state_change
;
680 sk
->sk_data_ready
= o2net_data_ready
;
681 sk
->sk_state_change
= o2net_state_change
;
683 mutex_init(&sc
->sc_send_lock
);
685 write_unlock_bh(&sk
->sk_callback_lock
);
688 static int o2net_unregister_callbacks(struct sock
*sk
,
689 struct o2net_sock_container
*sc
)
693 write_lock_bh(&sk
->sk_callback_lock
);
694 if (sk
->sk_user_data
== sc
) {
696 sk
->sk_user_data
= NULL
;
697 sk
->sk_data_ready
= sc
->sc_data_ready
;
698 sk
->sk_state_change
= sc
->sc_state_change
;
700 write_unlock_bh(&sk
->sk_callback_lock
);
706 * this is a little helper that is called by callers who have seen a problem
707 * with an sc and want to detach it from the nn if someone already hasn't beat
708 * them to it. if an error is given then the shutdown will be persistent
709 * and pending transmits will be canceled.
711 static void o2net_ensure_shutdown(struct o2net_node
*nn
,
712 struct o2net_sock_container
*sc
,
715 spin_lock(&nn
->nn_lock
);
717 o2net_set_nn_state(nn
, NULL
, 0, err
);
718 spin_unlock(&nn
->nn_lock
);
722 * This work queue function performs the blocking parts of socket shutdown. A
723 * few paths lead here. set_nn_state will trigger this callback if it sees an
724 * sc detached from the nn. state_change will also trigger this callback
725 * directly when it sees errors. In that case we need to call set_nn_state
726 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
729 static void o2net_shutdown_sc(struct work_struct
*work
)
731 struct o2net_sock_container
*sc
=
732 container_of(work
, struct o2net_sock_container
,
734 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
736 sclog(sc
, "shutting down\n");
738 /* drop the callbacks ref and call shutdown only once */
739 if (o2net_unregister_callbacks(sc
->sc_sock
->sk
, sc
)) {
740 /* we shouldn't flush as we're in the thread, the
741 * races with pending sc work structs are harmless */
742 del_timer_sync(&sc
->sc_idle_timeout
);
743 o2net_sc_cancel_delayed_work(sc
, &sc
->sc_keepalive_work
);
745 kernel_sock_shutdown(sc
->sc_sock
, SHUT_RDWR
);
748 /* not fatal so failed connects before the other guy has our
749 * heartbeat can be retried */
750 o2net_ensure_shutdown(nn
, sc
, 0);
754 /* ------------------------------------------------------------ */
756 static int o2net_handler_cmp(struct o2net_msg_handler
*nmh
, u32 msg_type
,
759 int ret
= memcmp(&nmh
->nh_key
, &key
, sizeof(key
));
762 ret
= memcmp(&nmh
->nh_msg_type
, &msg_type
, sizeof(msg_type
));
767 static struct o2net_msg_handler
*
768 o2net_handler_tree_lookup(u32 msg_type
, u32 key
, struct rb_node
***ret_p
,
769 struct rb_node
**ret_parent
)
771 struct rb_node
**p
= &o2net_handler_tree
.rb_node
;
772 struct rb_node
*parent
= NULL
;
773 struct o2net_msg_handler
*nmh
, *ret
= NULL
;
778 nmh
= rb_entry(parent
, struct o2net_msg_handler
, nh_node
);
779 cmp
= o2net_handler_cmp(nmh
, msg_type
, key
);
793 if (ret_parent
!= NULL
)
794 *ret_parent
= parent
;
799 static void o2net_handler_kref_release(struct kref
*kref
)
801 struct o2net_msg_handler
*nmh
;
802 nmh
= container_of(kref
, struct o2net_msg_handler
, nh_kref
);
807 static void o2net_handler_put(struct o2net_msg_handler
*nmh
)
809 kref_put(&nmh
->nh_kref
, o2net_handler_kref_release
);
812 /* max_len is protection for the handler func. incoming messages won't
813 * be given to the handler if their payload is longer than the max. */
814 int o2net_register_handler(u32 msg_type
, u32 key
, u32 max_len
,
815 o2net_msg_handler_func
*func
, void *data
,
816 o2net_post_msg_handler_func
*post_func
,
817 struct list_head
*unreg_list
)
819 struct o2net_msg_handler
*nmh
= NULL
;
820 struct rb_node
**p
, *parent
;
823 if (max_len
> O2NET_MAX_PAYLOAD_BYTES
) {
824 mlog(0, "max_len for message handler out of range: %u\n",
831 mlog(0, "no message type provided: %u, %p\n", msg_type
, func
);
837 mlog(0, "no message handler provided: %u, %p\n",
843 nmh
= kzalloc(sizeof(struct o2net_msg_handler
), GFP_NOFS
);
850 nmh
->nh_func_data
= data
;
851 nmh
->nh_post_func
= post_func
;
852 nmh
->nh_msg_type
= msg_type
;
853 nmh
->nh_max_len
= max_len
;
855 /* the tree and list get this ref.. they're both removed in
856 * unregister when this ref is dropped */
857 kref_init(&nmh
->nh_kref
);
858 INIT_LIST_HEAD(&nmh
->nh_unregister_item
);
860 write_lock(&o2net_handler_lock
);
861 if (o2net_handler_tree_lookup(msg_type
, key
, &p
, &parent
))
864 rb_link_node(&nmh
->nh_node
, parent
, p
);
865 rb_insert_color(&nmh
->nh_node
, &o2net_handler_tree
);
866 list_add_tail(&nmh
->nh_unregister_item
, unreg_list
);
868 mlog(ML_TCP
, "registered handler func %p type %u key %08x\n",
869 func
, msg_type
, key
);
870 /* we've had some trouble with handlers seemingly vanishing. */
871 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type
, key
, &p
,
873 "couldn't find handler we *just* registerd "
874 "for type %u key %08x\n", msg_type
, key
);
876 write_unlock(&o2net_handler_lock
);
886 EXPORT_SYMBOL_GPL(o2net_register_handler
);
888 void o2net_unregister_handler_list(struct list_head
*list
)
890 struct o2net_msg_handler
*nmh
, *n
;
892 write_lock(&o2net_handler_lock
);
893 list_for_each_entry_safe(nmh
, n
, list
, nh_unregister_item
) {
894 mlog(ML_TCP
, "unregistering handler func %p type %u key %08x\n",
895 nmh
->nh_func
, nmh
->nh_msg_type
, nmh
->nh_key
);
896 rb_erase(&nmh
->nh_node
, &o2net_handler_tree
);
897 list_del_init(&nmh
->nh_unregister_item
);
898 kref_put(&nmh
->nh_kref
, o2net_handler_kref_release
);
900 write_unlock(&o2net_handler_lock
);
902 EXPORT_SYMBOL_GPL(o2net_unregister_handler_list
);
904 static struct o2net_msg_handler
*o2net_handler_get(u32 msg_type
, u32 key
)
906 struct o2net_msg_handler
*nmh
;
908 read_lock(&o2net_handler_lock
);
909 nmh
= o2net_handler_tree_lookup(msg_type
, key
, NULL
, NULL
);
911 kref_get(&nmh
->nh_kref
);
912 read_unlock(&o2net_handler_lock
);
917 /* ------------------------------------------------------------ */
919 static int o2net_recv_tcp_msg(struct socket
*sock
, void *data
, size_t len
)
927 struct msghdr msg
= {
929 .msg_iov
= (struct iovec
*)&vec
,
930 .msg_flags
= MSG_DONTWAIT
,
935 ret
= sock_recvmsg(sock
, &msg
, len
, msg
.msg_flags
);
941 static int o2net_send_tcp_msg(struct socket
*sock
, struct kvec
*vec
,
942 size_t veclen
, size_t total
)
946 struct msghdr msg
= {
947 .msg_iov
= (struct iovec
*)vec
,
948 .msg_iovlen
= veclen
,
958 ret
= sock_sendmsg(sock
, &msg
, total
);
961 mlog(ML_ERROR
, "sendmsg returned %d instead of %zu\n", ret
,
964 ret
= -EPIPE
; /* should be smarter, I bet */
971 mlog(0, "returning error: %d\n", ret
);
975 static void o2net_sendpage(struct o2net_sock_container
*sc
,
976 void *kmalloced_virt
,
979 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
983 mutex_lock(&sc
->sc_send_lock
);
984 ret
= sc
->sc_sock
->ops
->sendpage(sc
->sc_sock
,
985 virt_to_page(kmalloced_virt
),
986 (long)kmalloced_virt
& ~PAGE_MASK
,
988 mutex_unlock(&sc
->sc_send_lock
);
991 if (ret
== (ssize_t
)-EAGAIN
) {
992 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
993 " returned EAGAIN\n", size
, SC_NODEF_ARGS(sc
));
997 mlog(ML_ERROR
, "sendpage of size %zu to " SC_NODEF_FMT
998 " failed with %zd\n", size
, SC_NODEF_ARGS(sc
), ret
);
999 o2net_ensure_shutdown(nn
, sc
, 0);
1004 static void o2net_init_msg(struct o2net_msg
*msg
, u16 data_len
, u16 msg_type
, u32 key
)
1006 memset(msg
, 0, sizeof(struct o2net_msg
));
1007 msg
->magic
= cpu_to_be16(O2NET_MSG_MAGIC
);
1008 msg
->data_len
= cpu_to_be16(data_len
);
1009 msg
->msg_type
= cpu_to_be16(msg_type
);
1010 msg
->sys_status
= cpu_to_be32(O2NET_ERR_NONE
);
1012 msg
->key
= cpu_to_be32(key
);
1015 static int o2net_tx_can_proceed(struct o2net_node
*nn
,
1016 struct o2net_sock_container
**sc_ret
,
1021 spin_lock(&nn
->nn_lock
);
1022 if (nn
->nn_persistent_error
) {
1025 *error
= nn
->nn_persistent_error
;
1026 } else if (nn
->nn_sc_valid
) {
1027 kref_get(&nn
->nn_sc
->sc_kref
);
1030 *sc_ret
= nn
->nn_sc
;
1033 spin_unlock(&nn
->nn_lock
);
1038 /* Get a map of all nodes to which this node is currently connected to */
1039 void o2net_fill_node_map(unsigned long *map
, unsigned bytes
)
1041 struct o2net_sock_container
*sc
;
1044 BUG_ON(bytes
< (BITS_TO_LONGS(O2NM_MAX_NODES
) * sizeof(unsigned long)));
1046 memset(map
, 0, bytes
);
1047 for (node
= 0; node
< O2NM_MAX_NODES
; ++node
) {
1048 o2net_tx_can_proceed(o2net_nn_from_num(node
), &sc
, &ret
);
1055 EXPORT_SYMBOL_GPL(o2net_fill_node_map
);
1057 int o2net_send_message_vec(u32 msg_type
, u32 key
, struct kvec
*caller_vec
,
1058 size_t caller_veclen
, u8 target_node
, int *status
)
1061 struct o2net_msg
*msg
= NULL
;
1062 size_t veclen
, caller_bytes
= 0;
1063 struct kvec
*vec
= NULL
;
1064 struct o2net_sock_container
*sc
= NULL
;
1065 struct o2net_node
*nn
= o2net_nn_from_num(target_node
);
1066 struct o2net_status_wait nsw
= {
1067 .ns_node_item
= LIST_HEAD_INIT(nsw
.ns_node_item
),
1069 struct o2net_send_tracking nst
;
1071 o2net_init_nst(&nst
, msg_type
, key
, current
, target_node
);
1073 if (o2net_wq
== NULL
) {
1074 mlog(0, "attempt to tx without o2netd running\n");
1079 if (caller_veclen
== 0) {
1080 mlog(0, "bad kvec array length\n");
1085 caller_bytes
= iov_length((struct iovec
*)caller_vec
, caller_veclen
);
1086 if (caller_bytes
> O2NET_MAX_PAYLOAD_BYTES
) {
1087 mlog(0, "total payload len %zu too large\n", caller_bytes
);
1092 if (target_node
== o2nm_this_node()) {
1097 o2net_debug_add_nst(&nst
);
1099 o2net_set_nst_sock_time(&nst
);
1101 wait_event(nn
->nn_sc_wq
, o2net_tx_can_proceed(nn
, &sc
, &ret
));
1105 o2net_set_nst_sock_container(&nst
, sc
);
1107 veclen
= caller_veclen
+ 1;
1108 vec
= kmalloc(sizeof(struct kvec
) * veclen
, GFP_ATOMIC
);
1110 mlog(0, "failed to %zu element kvec!\n", veclen
);
1115 msg
= kmalloc(sizeof(struct o2net_msg
), GFP_ATOMIC
);
1117 mlog(0, "failed to allocate a o2net_msg!\n");
1122 o2net_init_msg(msg
, caller_bytes
, msg_type
, key
);
1124 vec
[0].iov_len
= sizeof(struct o2net_msg
);
1125 vec
[0].iov_base
= msg
;
1126 memcpy(&vec
[1], caller_vec
, caller_veclen
* sizeof(struct kvec
));
1128 ret
= o2net_prep_nsw(nn
, &nsw
);
1132 msg
->msg_num
= cpu_to_be32(nsw
.ns_id
);
1133 o2net_set_nst_msg_id(&nst
, nsw
.ns_id
);
1135 o2net_set_nst_send_time(&nst
);
1137 /* finally, convert the message header to network byte-order
1139 mutex_lock(&sc
->sc_send_lock
);
1140 ret
= o2net_send_tcp_msg(sc
->sc_sock
, vec
, veclen
,
1141 sizeof(struct o2net_msg
) + caller_bytes
);
1142 mutex_unlock(&sc
->sc_send_lock
);
1143 msglog(msg
, "sending returned %d\n", ret
);
1145 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret
);
1149 /* wait on other node's handler */
1150 o2net_set_nst_status_time(&nst
);
1151 wait_event(nsw
.ns_wq
, o2net_nsw_completed(nn
, &nsw
));
1153 o2net_update_send_stats(&nst
, sc
);
1155 /* Note that we avoid overwriting the callers status return
1156 * variable if a system error was reported on the other
1157 * side. Callers beware. */
1158 ret
= o2net_sys_err_to_errno(nsw
.ns_sys_status
);
1160 *status
= nsw
.ns_status
;
1162 mlog(0, "woken, returning system status %d, user status %d\n",
1163 ret
, nsw
.ns_status
);
1165 o2net_debug_del_nst(&nst
); /* must be before dropping sc and node */
1172 o2net_complete_nsw(nn
, &nsw
, 0, 0, 0);
1175 EXPORT_SYMBOL_GPL(o2net_send_message_vec
);
1177 int o2net_send_message(u32 msg_type
, u32 key
, void *data
, u32 len
,
1178 u8 target_node
, int *status
)
1184 return o2net_send_message_vec(msg_type
, key
, &vec
, 1,
1185 target_node
, status
);
1187 EXPORT_SYMBOL_GPL(o2net_send_message
);
1189 static int o2net_send_status_magic(struct socket
*sock
, struct o2net_msg
*hdr
,
1190 enum o2net_system_error syserr
, int err
)
1194 .iov_len
= sizeof(struct o2net_msg
),
1197 BUG_ON(syserr
>= O2NET_ERR_MAX
);
1199 /* leave other fields intact from the incoming message, msg_num
1201 hdr
->sys_status
= cpu_to_be32(syserr
);
1202 hdr
->status
= cpu_to_be32(err
);
1203 hdr
->magic
= cpu_to_be16(O2NET_MSG_STATUS_MAGIC
); // twiddle the magic
1206 msglog(hdr
, "about to send status magic %d\n", err
);
1207 /* hdr has been in host byteorder this whole time */
1208 return o2net_send_tcp_msg(sock
, &vec
, 1, sizeof(struct o2net_msg
));
1211 /* this returns -errno if the header was unknown or too large, etc.
1212 * after this is called the buffer us reused for the next message */
1213 static int o2net_process_message(struct o2net_sock_container
*sc
,
1214 struct o2net_msg
*hdr
)
1216 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1217 int ret
= 0, handler_status
;
1218 enum o2net_system_error syserr
;
1219 struct o2net_msg_handler
*nmh
= NULL
;
1220 void *ret_data
= NULL
;
1222 msglog(hdr
, "processing message\n");
1224 o2net_sc_postpone_idle(sc
);
1226 switch(be16_to_cpu(hdr
->magic
)) {
1227 case O2NET_MSG_STATUS_MAGIC
:
1228 /* special type for returning message status */
1229 o2net_complete_nsw(nn
, NULL
,
1230 be32_to_cpu(hdr
->msg_num
),
1231 be32_to_cpu(hdr
->sys_status
),
1232 be32_to_cpu(hdr
->status
));
1234 case O2NET_MSG_KEEP_REQ_MAGIC
:
1235 o2net_sendpage(sc
, o2net_keep_resp
,
1236 sizeof(*o2net_keep_resp
));
1238 case O2NET_MSG_KEEP_RESP_MAGIC
:
1240 case O2NET_MSG_MAGIC
:
1243 msglog(hdr
, "bad magic\n");
1249 /* find a handler for it */
1251 nmh
= o2net_handler_get(be16_to_cpu(hdr
->msg_type
),
1252 be32_to_cpu(hdr
->key
));
1254 mlog(ML_TCP
, "couldn't find handler for type %u key %08x\n",
1255 be16_to_cpu(hdr
->msg_type
), be32_to_cpu(hdr
->key
));
1256 syserr
= O2NET_ERR_NO_HNDLR
;
1260 syserr
= O2NET_ERR_NONE
;
1262 if (be16_to_cpu(hdr
->data_len
) > nmh
->nh_max_len
)
1263 syserr
= O2NET_ERR_OVERFLOW
;
1265 if (syserr
!= O2NET_ERR_NONE
)
1268 o2net_set_func_start_time(sc
);
1269 sc
->sc_msg_key
= be32_to_cpu(hdr
->key
);
1270 sc
->sc_msg_type
= be16_to_cpu(hdr
->msg_type
);
1271 handler_status
= (nmh
->nh_func
)(hdr
, sizeof(struct o2net_msg
) +
1272 be16_to_cpu(hdr
->data_len
),
1273 nmh
->nh_func_data
, &ret_data
);
1274 o2net_set_func_stop_time(sc
);
1276 o2net_update_recv_stats(sc
);
1279 /* this destroys the hdr, so don't use it after this */
1280 mutex_lock(&sc
->sc_send_lock
);
1281 ret
= o2net_send_status_magic(sc
->sc_sock
, hdr
, syserr
,
1283 mutex_unlock(&sc
->sc_send_lock
);
1285 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1286 handler_status
, syserr
, ret
);
1289 BUG_ON(ret_data
!= NULL
&& nmh
->nh_post_func
== NULL
);
1290 if (nmh
->nh_post_func
)
1291 (nmh
->nh_post_func
)(handler_status
, nmh
->nh_func_data
,
1297 o2net_handler_put(nmh
);
1301 static int o2net_check_handshake(struct o2net_sock_container
*sc
)
1303 struct o2net_handshake
*hand
= page_address(sc
->sc_page
);
1304 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1306 if (hand
->protocol_version
!= cpu_to_be64(O2NET_PROTOCOL_VERSION
)) {
1307 printk(KERN_NOTICE
"o2net: " SC_NODEF_FMT
" Advertised net "
1308 "protocol version %llu but %llu is required. "
1309 "Disconnecting.\n", SC_NODEF_ARGS(sc
),
1310 (unsigned long long)be64_to_cpu(hand
->protocol_version
),
1311 O2NET_PROTOCOL_VERSION
);
1313 /* don't bother reconnecting if its the wrong version. */
1314 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1319 * Ensure timeouts are consistent with other nodes, otherwise
1320 * we can end up with one node thinking that the other must be down,
1321 * but isn't. This can ultimately cause corruption.
1323 if (be32_to_cpu(hand
->o2net_idle_timeout_ms
) !=
1324 o2net_idle_timeout()) {
1325 printk(KERN_NOTICE
"o2net: " SC_NODEF_FMT
" uses a network "
1326 "idle timeout of %u ms, but we use %u ms locally. "
1327 "Disconnecting.\n", SC_NODEF_ARGS(sc
),
1328 be32_to_cpu(hand
->o2net_idle_timeout_ms
),
1329 o2net_idle_timeout());
1330 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1334 if (be32_to_cpu(hand
->o2net_keepalive_delay_ms
) !=
1335 o2net_keepalive_delay()) {
1336 printk(KERN_NOTICE
"o2net: " SC_NODEF_FMT
" uses a keepalive "
1337 "delay of %u ms, but we use %u ms locally. "
1338 "Disconnecting.\n", SC_NODEF_ARGS(sc
),
1339 be32_to_cpu(hand
->o2net_keepalive_delay_ms
),
1340 o2net_keepalive_delay());
1341 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1345 if (be32_to_cpu(hand
->o2hb_heartbeat_timeout_ms
) !=
1346 O2HB_MAX_WRITE_TIMEOUT_MS
) {
1347 printk(KERN_NOTICE
"o2net: " SC_NODEF_FMT
" uses a heartbeat "
1348 "timeout of %u ms, but we use %u ms locally. "
1349 "Disconnecting.\n", SC_NODEF_ARGS(sc
),
1350 be32_to_cpu(hand
->o2hb_heartbeat_timeout_ms
),
1351 O2HB_MAX_WRITE_TIMEOUT_MS
);
1352 o2net_ensure_shutdown(nn
, sc
, -ENOTCONN
);
1356 sc
->sc_handshake_ok
= 1;
1358 spin_lock(&nn
->nn_lock
);
1359 /* set valid and queue the idle timers only if it hasn't been
1360 * shut down already */
1361 if (nn
->nn_sc
== sc
) {
1362 o2net_sc_reset_idle_timer(sc
);
1363 atomic_set(&nn
->nn_timeout
, 0);
1364 o2net_set_nn_state(nn
, sc
, 1, 0);
1366 spin_unlock(&nn
->nn_lock
);
1368 /* shift everything up as though it wasn't there */
1369 sc
->sc_page_off
-= sizeof(struct o2net_handshake
);
1370 if (sc
->sc_page_off
)
1371 memmove(hand
, hand
+ 1, sc
->sc_page_off
);
1376 /* this demuxes the queued rx bytes into header or payload bits and calls
1377 * handlers as each full message is read off the socket. it returns -error,
1378 * == 0 eof, or > 0 for progress made.*/
1379 static int o2net_advance_rx(struct o2net_sock_container
*sc
)
1381 struct o2net_msg
*hdr
;
1386 sclog(sc
, "receiving\n");
1387 o2net_set_advance_start_time(sc
);
1389 if (unlikely(sc
->sc_handshake_ok
== 0)) {
1390 if(sc
->sc_page_off
< sizeof(struct o2net_handshake
)) {
1391 data
= page_address(sc
->sc_page
) + sc
->sc_page_off
;
1392 datalen
= sizeof(struct o2net_handshake
) - sc
->sc_page_off
;
1393 ret
= o2net_recv_tcp_msg(sc
->sc_sock
, data
, datalen
);
1395 sc
->sc_page_off
+= ret
;
1398 if (sc
->sc_page_off
== sizeof(struct o2net_handshake
)) {
1399 o2net_check_handshake(sc
);
1400 if (unlikely(sc
->sc_handshake_ok
== 0))
1406 /* do we need more header? */
1407 if (sc
->sc_page_off
< sizeof(struct o2net_msg
)) {
1408 data
= page_address(sc
->sc_page
) + sc
->sc_page_off
;
1409 datalen
= sizeof(struct o2net_msg
) - sc
->sc_page_off
;
1410 ret
= o2net_recv_tcp_msg(sc
->sc_sock
, data
, datalen
);
1412 sc
->sc_page_off
+= ret
;
1413 /* only swab incoming here.. we can
1414 * only get here once as we cross from
1415 * being under to over */
1416 if (sc
->sc_page_off
== sizeof(struct o2net_msg
)) {
1417 hdr
= page_address(sc
->sc_page
);
1418 if (be16_to_cpu(hdr
->data_len
) >
1419 O2NET_MAX_PAYLOAD_BYTES
)
1427 if (sc
->sc_page_off
< sizeof(struct o2net_msg
)) {
1428 /* oof, still don't have a header */
1432 /* this was swabbed above when we first read it */
1433 hdr
= page_address(sc
->sc_page
);
1435 msglog(hdr
, "at page_off %zu\n", sc
->sc_page_off
);
1437 /* do we need more payload? */
1438 if (sc
->sc_page_off
- sizeof(struct o2net_msg
) < be16_to_cpu(hdr
->data_len
)) {
1439 /* need more payload */
1440 data
= page_address(sc
->sc_page
) + sc
->sc_page_off
;
1441 datalen
= (sizeof(struct o2net_msg
) + be16_to_cpu(hdr
->data_len
)) -
1443 ret
= o2net_recv_tcp_msg(sc
->sc_sock
, data
, datalen
);
1445 sc
->sc_page_off
+= ret
;
1450 if (sc
->sc_page_off
- sizeof(struct o2net_msg
) == be16_to_cpu(hdr
->data_len
)) {
1451 /* we can only get here once, the first time we read
1452 * the payload.. so set ret to progress if the handler
1453 * works out. after calling this the message is toast */
1454 ret
= o2net_process_message(sc
, hdr
);
1457 sc
->sc_page_off
= 0;
1461 sclog(sc
, "ret = %d\n", ret
);
1462 o2net_set_advance_stop_time(sc
);
1466 /* this work func is triggerd by data ready. it reads until it can read no
1467 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1468 * our work the work struct will be marked and we'll be called again. */
1469 static void o2net_rx_until_empty(struct work_struct
*work
)
1471 struct o2net_sock_container
*sc
=
1472 container_of(work
, struct o2net_sock_container
, sc_rx_work
);
1476 ret
= o2net_advance_rx(sc
);
1479 if (ret
<= 0 && ret
!= -EAGAIN
) {
1480 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1481 sclog(sc
, "saw error %d, closing\n", ret
);
1482 /* not permanent so read failed handshake can retry */
1483 o2net_ensure_shutdown(nn
, sc
, 0);
1489 static int o2net_set_nodelay(struct socket
*sock
)
1498 * Dear unsuspecting programmer,
1500 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1501 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1502 * silently turn into SO_DEBUG.
1505 * Keeper of hilariously fragile interfaces.
1507 ret
= sock
->ops
->setsockopt(sock
, SOL_TCP
, TCP_NODELAY
,
1508 (char __user
*)&val
, sizeof(val
));
1514 static void o2net_initialize_handshake(void)
1516 o2net_hand
->o2hb_heartbeat_timeout_ms
= cpu_to_be32(
1517 O2HB_MAX_WRITE_TIMEOUT_MS
);
1518 o2net_hand
->o2net_idle_timeout_ms
= cpu_to_be32(o2net_idle_timeout());
1519 o2net_hand
->o2net_keepalive_delay_ms
= cpu_to_be32(
1520 o2net_keepalive_delay());
1521 o2net_hand
->o2net_reconnect_delay_ms
= cpu_to_be32(
1522 o2net_reconnect_delay());
1525 /* ------------------------------------------------------------ */
1527 /* called when a connect completes and after a sock is accepted. the
1528 * rx path will see the response and mark the sc valid */
1529 static void o2net_sc_connect_completed(struct work_struct
*work
)
1531 struct o2net_sock_container
*sc
=
1532 container_of(work
, struct o2net_sock_container
,
1535 mlog(ML_MSG
, "sc sending handshake with ver %llu id %llx\n",
1536 (unsigned long long)O2NET_PROTOCOL_VERSION
,
1537 (unsigned long long)be64_to_cpu(o2net_hand
->connector_id
));
1539 o2net_initialize_handshake();
1540 o2net_sendpage(sc
, o2net_hand
, sizeof(*o2net_hand
));
1544 /* this is called as a work_struct func. */
1545 static void o2net_sc_send_keep_req(struct work_struct
*work
)
1547 struct o2net_sock_container
*sc
=
1548 container_of(work
, struct o2net_sock_container
,
1549 sc_keepalive_work
.work
);
1551 o2net_sendpage(sc
, o2net_keep_req
, sizeof(*o2net_keep_req
));
1555 /* socket shutdown does a del_timer_sync against this as it tears down.
1556 * we can't start this timer until we've got to the point in sc buildup
1557 * where shutdown is going to be involved */
1558 static void o2net_idle_timer(unsigned long data
)
1560 struct o2net_sock_container
*sc
= (struct o2net_sock_container
*)data
;
1561 struct o2net_node
*nn
= o2net_nn_from_num(sc
->sc_node
->nd_num
);
1562 #ifdef CONFIG_DEBUG_FS
1563 unsigned long msecs
= ktime_to_ms(ktime_get()) -
1564 ktime_to_ms(sc
->sc_tv_timer
);
1566 unsigned long msecs
= o2net_idle_timeout();
1569 printk(KERN_NOTICE
"o2net: Connection to " SC_NODEF_FMT
" has been "
1570 "idle for %lu.%lu secs, shutting it down.\n", SC_NODEF_ARGS(sc
),
1571 msecs
/ 1000, msecs
% 1000);
1574 * Initialize the nn_timeout so that the next connection attempt
1575 * will continue in o2net_start_connect.
1577 atomic_set(&nn
->nn_timeout
, 1);
1579 o2net_sc_queue_work(sc
, &sc
->sc_shutdown_work
);
1582 static void o2net_sc_reset_idle_timer(struct o2net_sock_container
*sc
)
1584 o2net_sc_cancel_delayed_work(sc
, &sc
->sc_keepalive_work
);
1585 o2net_sc_queue_delayed_work(sc
, &sc
->sc_keepalive_work
,
1586 msecs_to_jiffies(o2net_keepalive_delay()));
1587 o2net_set_sock_timer(sc
);
1588 mod_timer(&sc
->sc_idle_timeout
,
1589 jiffies
+ msecs_to_jiffies(o2net_idle_timeout()));
1592 static void o2net_sc_postpone_idle(struct o2net_sock_container
*sc
)
1594 /* Only push out an existing timer */
1595 if (timer_pending(&sc
->sc_idle_timeout
))
1596 o2net_sc_reset_idle_timer(sc
);
1599 /* this work func is kicked whenever a path sets the nn state which doesn't
1600 * have valid set. This includes seeing hb come up, losing a connection,
1601 * having a connect attempt fail, etc. This centralizes the logic which decides
1602 * if a connect attempt should be made or if we should give up and all future
1603 * transmit attempts should fail */
1604 static void o2net_start_connect(struct work_struct
*work
)
1606 struct o2net_node
*nn
=
1607 container_of(work
, struct o2net_node
, nn_connect_work
.work
);
1608 struct o2net_sock_container
*sc
= NULL
;
1609 struct o2nm_node
*node
= NULL
, *mynode
= NULL
;
1610 struct socket
*sock
= NULL
;
1611 struct sockaddr_in myaddr
= {0, }, remoteaddr
= {0, };
1613 unsigned int timeout
;
1615 /* if we're greater we initiate tx, otherwise we accept */
1616 if (o2nm_this_node() <= o2net_num_from_nn(nn
))
1619 /* watch for racing with tearing a node down */
1620 node
= o2nm_get_node_by_num(o2net_num_from_nn(nn
));
1626 mynode
= o2nm_get_node_by_num(o2nm_this_node());
1627 if (mynode
== NULL
) {
1632 spin_lock(&nn
->nn_lock
);
1634 * see if we already have one pending or have given up.
1635 * For nn_timeout, it is set when we close the connection
1636 * because of the idle time out. So it means that we have
1637 * at least connected to that node successfully once,
1638 * now try to connect to it again.
1640 timeout
= atomic_read(&nn
->nn_timeout
);
1641 stop
= (nn
->nn_sc
||
1642 (nn
->nn_persistent_error
&&
1643 (nn
->nn_persistent_error
!= -ENOTCONN
|| timeout
== 0)));
1644 spin_unlock(&nn
->nn_lock
);
1648 nn
->nn_last_connect_attempt
= jiffies
;
1650 sc
= sc_alloc(node
);
1652 mlog(0, "couldn't allocate sc\n");
1657 ret
= sock_create(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
);
1659 mlog(0, "can't create socket: %d\n", ret
);
1662 sc
->sc_sock
= sock
; /* freed by sc_kref_release */
1664 sock
->sk
->sk_allocation
= GFP_ATOMIC
;
1666 myaddr
.sin_family
= AF_INET
;
1667 myaddr
.sin_addr
.s_addr
= mynode
->nd_ipv4_address
;
1668 myaddr
.sin_port
= htons(0); /* any port */
1670 ret
= sock
->ops
->bind(sock
, (struct sockaddr
*)&myaddr
,
1673 mlog(ML_ERROR
, "bind failed with %d at address %pI4\n",
1674 ret
, &mynode
->nd_ipv4_address
);
1678 ret
= o2net_set_nodelay(sc
->sc_sock
);
1680 mlog(ML_ERROR
, "setting TCP_NODELAY failed with %d\n", ret
);
1684 o2net_register_callbacks(sc
->sc_sock
->sk
, sc
);
1686 spin_lock(&nn
->nn_lock
);
1687 /* handshake completion will set nn->nn_sc_valid */
1688 o2net_set_nn_state(nn
, sc
, 0, 0);
1689 spin_unlock(&nn
->nn_lock
);
1691 remoteaddr
.sin_family
= AF_INET
;
1692 remoteaddr
.sin_addr
.s_addr
= node
->nd_ipv4_address
;
1693 remoteaddr
.sin_port
= node
->nd_ipv4_port
;
1695 ret
= sc
->sc_sock
->ops
->connect(sc
->sc_sock
,
1696 (struct sockaddr
*)&remoteaddr
,
1699 if (ret
== -EINPROGRESS
)
1704 printk(KERN_NOTICE
"o2net: Connect attempt to " SC_NODEF_FMT
1705 " failed with errno %d\n", SC_NODEF_ARGS(sc
), ret
);
1706 /* 0 err so that another will be queued and attempted
1707 * from set_nn_state */
1709 o2net_ensure_shutdown(nn
, sc
, 0);
1714 o2nm_node_put(node
);
1716 o2nm_node_put(mynode
);
1721 static void o2net_connect_expired(struct work_struct
*work
)
1723 struct o2net_node
*nn
=
1724 container_of(work
, struct o2net_node
, nn_connect_expired
.work
);
1726 spin_lock(&nn
->nn_lock
);
1727 if (!nn
->nn_sc_valid
) {
1728 printk(KERN_NOTICE
"o2net: No connection established with "
1729 "node %u after %u.%u seconds, giving up.\n",
1730 o2net_num_from_nn(nn
),
1731 o2net_idle_timeout() / 1000,
1732 o2net_idle_timeout() % 1000);
1734 o2net_set_nn_state(nn
, NULL
, 0, -ENOTCONN
);
1736 spin_unlock(&nn
->nn_lock
);
1739 static void o2net_still_up(struct work_struct
*work
)
1741 struct o2net_node
*nn
=
1742 container_of(work
, struct o2net_node
, nn_still_up
.work
);
1744 o2quo_hb_still_up(o2net_num_from_nn(nn
));
1747 /* ------------------------------------------------------------ */
1749 void o2net_disconnect_node(struct o2nm_node
*node
)
1751 struct o2net_node
*nn
= o2net_nn_from_num(node
->nd_num
);
1753 /* don't reconnect until it's heartbeating again */
1754 spin_lock(&nn
->nn_lock
);
1755 atomic_set(&nn
->nn_timeout
, 0);
1756 o2net_set_nn_state(nn
, NULL
, 0, -ENOTCONN
);
1757 spin_unlock(&nn
->nn_lock
);
1760 cancel_delayed_work(&nn
->nn_connect_expired
);
1761 cancel_delayed_work(&nn
->nn_connect_work
);
1762 cancel_delayed_work(&nn
->nn_still_up
);
1763 flush_workqueue(o2net_wq
);
1767 static void o2net_hb_node_down_cb(struct o2nm_node
*node
, int node_num
,
1770 o2quo_hb_down(node_num
);
1775 if (node_num
!= o2nm_this_node())
1776 o2net_disconnect_node(node
);
1778 BUG_ON(atomic_read(&o2net_connected_peers
) < 0);
1781 static void o2net_hb_node_up_cb(struct o2nm_node
*node
, int node_num
,
1784 struct o2net_node
*nn
= o2net_nn_from_num(node_num
);
1786 o2quo_hb_up(node_num
);
1790 /* ensure an immediate connect attempt */
1791 nn
->nn_last_connect_attempt
= jiffies
-
1792 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
1794 if (node_num
!= o2nm_this_node()) {
1795 /* believe it or not, accept and node hearbeating testing
1796 * can succeed for this node before we got here.. so
1797 * only use set_nn_state to clear the persistent error
1798 * if that hasn't already happened */
1799 spin_lock(&nn
->nn_lock
);
1800 atomic_set(&nn
->nn_timeout
, 0);
1801 if (nn
->nn_persistent_error
)
1802 o2net_set_nn_state(nn
, NULL
, 0, 0);
1803 spin_unlock(&nn
->nn_lock
);
1807 void o2net_unregister_hb_callbacks(void)
1809 o2hb_unregister_callback(NULL
, &o2net_hb_up
);
1810 o2hb_unregister_callback(NULL
, &o2net_hb_down
);
1813 int o2net_register_hb_callbacks(void)
1817 o2hb_setup_callback(&o2net_hb_down
, O2HB_NODE_DOWN_CB
,
1818 o2net_hb_node_down_cb
, NULL
, O2NET_HB_PRI
);
1819 o2hb_setup_callback(&o2net_hb_up
, O2HB_NODE_UP_CB
,
1820 o2net_hb_node_up_cb
, NULL
, O2NET_HB_PRI
);
1822 ret
= o2hb_register_callback(NULL
, &o2net_hb_up
);
1824 ret
= o2hb_register_callback(NULL
, &o2net_hb_down
);
1827 o2net_unregister_hb_callbacks();
1832 /* ------------------------------------------------------------ */
1834 static int o2net_accept_one(struct socket
*sock
)
1837 struct sockaddr_in sin
;
1838 struct socket
*new_sock
= NULL
;
1839 struct o2nm_node
*node
= NULL
;
1840 struct o2nm_node
*local_node
= NULL
;
1841 struct o2net_sock_container
*sc
= NULL
;
1842 struct o2net_node
*nn
;
1844 BUG_ON(sock
== NULL
);
1845 ret
= sock_create_lite(sock
->sk
->sk_family
, sock
->sk
->sk_type
,
1846 sock
->sk
->sk_protocol
, &new_sock
);
1850 new_sock
->type
= sock
->type
;
1851 new_sock
->ops
= sock
->ops
;
1852 ret
= sock
->ops
->accept(sock
, new_sock
, O_NONBLOCK
);
1856 new_sock
->sk
->sk_allocation
= GFP_ATOMIC
;
1858 ret
= o2net_set_nodelay(new_sock
);
1860 mlog(ML_ERROR
, "setting TCP_NODELAY failed with %d\n", ret
);
1865 ret
= new_sock
->ops
->getname(new_sock
, (struct sockaddr
*) &sin
,
1870 node
= o2nm_get_node_by_ip(sin
.sin_addr
.s_addr
);
1872 printk(KERN_NOTICE
"o2net: Attempt to connect from unknown "
1873 "node at %pI4:%d\n", &sin
.sin_addr
.s_addr
,
1874 ntohs(sin
.sin_port
));
1879 if (o2nm_this_node() >= node
->nd_num
) {
1880 local_node
= o2nm_get_node_by_num(o2nm_this_node());
1881 printk(KERN_NOTICE
"o2net: Unexpected connect attempt seen "
1882 "at node '%s' (%u, %pI4:%d) from node '%s' (%u, "
1883 "%pI4:%d)\n", local_node
->nd_name
, local_node
->nd_num
,
1884 &(local_node
->nd_ipv4_address
),
1885 ntohs(local_node
->nd_ipv4_port
), node
->nd_name
,
1886 node
->nd_num
, &sin
.sin_addr
.s_addr
, ntohs(sin
.sin_port
));
1891 /* this happens all the time when the other node sees our heartbeat
1892 * and tries to connect before we see their heartbeat */
1893 if (!o2hb_check_node_heartbeating_from_callback(node
->nd_num
)) {
1894 mlog(ML_CONN
, "attempt to connect from node '%s' at "
1895 "%pI4:%d but it isn't heartbeating\n",
1896 node
->nd_name
, &sin
.sin_addr
.s_addr
,
1897 ntohs(sin
.sin_port
));
1902 nn
= o2net_nn_from_num(node
->nd_num
);
1904 spin_lock(&nn
->nn_lock
);
1909 spin_unlock(&nn
->nn_lock
);
1911 printk(KERN_NOTICE
"o2net: Attempt to connect from node '%s' "
1912 "at %pI4:%d but it already has an open connection\n",
1913 node
->nd_name
, &sin
.sin_addr
.s_addr
,
1914 ntohs(sin
.sin_port
));
1918 sc
= sc_alloc(node
);
1924 sc
->sc_sock
= new_sock
;
1927 spin_lock(&nn
->nn_lock
);
1928 atomic_set(&nn
->nn_timeout
, 0);
1929 o2net_set_nn_state(nn
, sc
, 0, 0);
1930 spin_unlock(&nn
->nn_lock
);
1932 o2net_register_callbacks(sc
->sc_sock
->sk
, sc
);
1933 o2net_sc_queue_work(sc
, &sc
->sc_rx_work
);
1935 o2net_initialize_handshake();
1936 o2net_sendpage(sc
, o2net_hand
, sizeof(*o2net_hand
));
1940 sock_release(new_sock
);
1942 o2nm_node_put(node
);
1944 o2nm_node_put(local_node
);
1950 static void o2net_accept_many(struct work_struct
*work
)
1952 struct socket
*sock
= o2net_listen_sock
;
1953 while (o2net_accept_one(sock
) == 0)
1957 static void o2net_listen_data_ready(struct sock
*sk
, int bytes
)
1959 void (*ready
)(struct sock
*sk
, int bytes
);
1961 read_lock(&sk
->sk_callback_lock
);
1962 ready
= sk
->sk_user_data
;
1963 if (ready
== NULL
) { /* check for teardown race */
1964 ready
= sk
->sk_data_ready
;
1968 /* ->sk_data_ready is also called for a newly established child socket
1969 * before it has been accepted and the acceptor has set up their
1970 * data_ready.. we only want to queue listen work for our listening
1972 if (sk
->sk_state
== TCP_LISTEN
) {
1973 mlog(ML_TCP
, "bytes: %d\n", bytes
);
1974 queue_work(o2net_wq
, &o2net_listen_work
);
1978 read_unlock(&sk
->sk_callback_lock
);
1982 static int o2net_open_listening_sock(__be32 addr
, __be16 port
)
1984 struct socket
*sock
= NULL
;
1986 struct sockaddr_in sin
= {
1987 .sin_family
= PF_INET
,
1988 .sin_addr
= { .s_addr
= addr
},
1992 ret
= sock_create(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
);
1994 printk(KERN_ERR
"o2net: Error %d while creating socket\n", ret
);
1998 sock
->sk
->sk_allocation
= GFP_ATOMIC
;
2000 write_lock_bh(&sock
->sk
->sk_callback_lock
);
2001 sock
->sk
->sk_user_data
= sock
->sk
->sk_data_ready
;
2002 sock
->sk
->sk_data_ready
= o2net_listen_data_ready
;
2003 write_unlock_bh(&sock
->sk
->sk_callback_lock
);
2005 o2net_listen_sock
= sock
;
2006 INIT_WORK(&o2net_listen_work
, o2net_accept_many
);
2008 sock
->sk
->sk_reuse
= 1;
2009 ret
= sock
->ops
->bind(sock
, (struct sockaddr
*)&sin
, sizeof(sin
));
2011 printk(KERN_ERR
"o2net: Error %d while binding socket at "
2012 "%pI4:%u\n", ret
, &addr
, ntohs(port
));
2016 ret
= sock
->ops
->listen(sock
, 64);
2018 printk(KERN_ERR
"o2net: Error %d while listening on %pI4:%u\n",
2019 ret
, &addr
, ntohs(port
));
2023 o2net_listen_sock
= NULL
;
2031 * called from node manager when we should bring up our network listening
2032 * socket. node manager handles all the serialization to only call this
2033 * once and to match it with o2net_stop_listening(). note,
2034 * o2nm_this_node() doesn't work yet as we're being called while it
2037 int o2net_start_listening(struct o2nm_node
*node
)
2041 BUG_ON(o2net_wq
!= NULL
);
2042 BUG_ON(o2net_listen_sock
!= NULL
);
2044 mlog(ML_KTHREAD
, "starting o2net thread...\n");
2045 o2net_wq
= create_singlethread_workqueue("o2net");
2046 if (o2net_wq
== NULL
) {
2047 mlog(ML_ERROR
, "unable to launch o2net thread\n");
2048 return -ENOMEM
; /* ? */
2051 ret
= o2net_open_listening_sock(node
->nd_ipv4_address
,
2052 node
->nd_ipv4_port
);
2054 destroy_workqueue(o2net_wq
);
2057 o2quo_conn_up(node
->nd_num
);
2062 /* again, o2nm_this_node() doesn't work here as we're involved in
2063 * tearing it down */
2064 void o2net_stop_listening(struct o2nm_node
*node
)
2066 struct socket
*sock
= o2net_listen_sock
;
2069 BUG_ON(o2net_wq
== NULL
);
2070 BUG_ON(o2net_listen_sock
== NULL
);
2072 /* stop the listening socket from generating work */
2073 write_lock_bh(&sock
->sk
->sk_callback_lock
);
2074 sock
->sk
->sk_data_ready
= sock
->sk
->sk_user_data
;
2075 sock
->sk
->sk_user_data
= NULL
;
2076 write_unlock_bh(&sock
->sk
->sk_callback_lock
);
2078 for (i
= 0; i
< ARRAY_SIZE(o2net_nodes
); i
++) {
2079 struct o2nm_node
*node
= o2nm_get_node_by_num(i
);
2081 o2net_disconnect_node(node
);
2082 o2nm_node_put(node
);
2086 /* finish all work and tear down the work queue */
2087 mlog(ML_KTHREAD
, "waiting for o2net thread to exit....\n");
2088 destroy_workqueue(o2net_wq
);
2091 sock_release(o2net_listen_sock
);
2092 o2net_listen_sock
= NULL
;
2094 o2quo_conn_err(node
->nd_num
);
2097 /* ------------------------------------------------------------ */
2099 int o2net_init(void)
2105 if (o2net_debugfs_init())
2108 o2net_hand
= kzalloc(sizeof(struct o2net_handshake
), GFP_KERNEL
);
2109 o2net_keep_req
= kzalloc(sizeof(struct o2net_msg
), GFP_KERNEL
);
2110 o2net_keep_resp
= kzalloc(sizeof(struct o2net_msg
), GFP_KERNEL
);
2111 if (!o2net_hand
|| !o2net_keep_req
|| !o2net_keep_resp
) {
2113 kfree(o2net_keep_req
);
2114 kfree(o2net_keep_resp
);
2118 o2net_hand
->protocol_version
= cpu_to_be64(O2NET_PROTOCOL_VERSION
);
2119 o2net_hand
->connector_id
= cpu_to_be64(1);
2121 o2net_keep_req
->magic
= cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC
);
2122 o2net_keep_resp
->magic
= cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC
);
2124 for (i
= 0; i
< ARRAY_SIZE(o2net_nodes
); i
++) {
2125 struct o2net_node
*nn
= o2net_nn_from_num(i
);
2127 atomic_set(&nn
->nn_timeout
, 0);
2128 spin_lock_init(&nn
->nn_lock
);
2129 INIT_DELAYED_WORK(&nn
->nn_connect_work
, o2net_start_connect
);
2130 INIT_DELAYED_WORK(&nn
->nn_connect_expired
,
2131 o2net_connect_expired
);
2132 INIT_DELAYED_WORK(&nn
->nn_still_up
, o2net_still_up
);
2133 /* until we see hb from a node we'll return einval */
2134 nn
->nn_persistent_error
= -ENOTCONN
;
2135 init_waitqueue_head(&nn
->nn_sc_wq
);
2136 idr_init(&nn
->nn_status_idr
);
2137 INIT_LIST_HEAD(&nn
->nn_status_list
);
2143 void o2net_exit(void)
2147 kfree(o2net_keep_req
);
2148 kfree(o2net_keep_resp
);
2149 o2net_debugfs_exit();