1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2005 Cluster File Systems, Inc. All rights reserved.
5 * Author: PJ Kirner <pjkirner@clusterfs.com>
6 * E Barton <eeb@bartonsoftware.com>
8 * This file is part of the Lustre file system, http://www.lustre.org
9 * Lustre is a trademark of Cluster File Systems, Inc.
11 * This file is confidential source code owned by Cluster File Systems.
12 * No viewing, modification, compilation, redistribution, or any other
13 * form of use is permitted except through a signed license agreement.
15 * If you have not signed such an agreement, then you have no rights to
16 * this file. Please destroy it immediately and contact CFS.
21 #include <libcfs/list.h>
24 kptllnd_count_queue(struct list_head *q)
37 kptllnd_get_peer_info(int index,
38 lnet_process_id_t *id,
39 int *state, int *sent_hello,
40 int *refcount, __u64 *incarnation,
41 __u64 *next_matchbits, __u64 *last_matchbits_seen,
42 int *nsendq, int *nactiveq,
43 int *credits, int *outstanding_credits)
45 rwlock_t *g_lock = &kptllnd_data.kptl_peer_rw_lock;
47 struct list_head *ptmp;
52 read_lock_irqsave(g_lock, flags);
54 for (i = 0; i < kptllnd_data.kptl_peer_hash_size; i++) {
56 list_for_each (ptmp, &kptllnd_data.kptl_peers[i]) {
57 peer = list_entry(ptmp, kptl_peer_t, peer_list);
63 *state = peer->peer_state;
64 *sent_hello = peer->peer_sent_hello;
65 *refcount = atomic_read(&peer->peer_refcount);
66 *incarnation = peer->peer_incarnation;
68 spin_lock(&peer->peer_lock);
70 *next_matchbits = peer->peer_next_matchbits;
71 *last_matchbits_seen = peer->peer_last_matchbits_seen;
72 *credits = peer->peer_credits;
73 *outstanding_credits = peer->peer_outstanding_credits;
75 *nsendq = kptllnd_count_queue(&peer->peer_sendq);
76 *nactiveq = kptllnd_count_queue(&peer->peer_activeq);
78 spin_unlock(&peer->peer_lock);
86 read_unlock_irqrestore(g_lock, flags);
91 kptllnd_peer_add_peertable_locked (kptl_peer_t *peer)
93 LASSERT (!kptllnd_data.kptl_shutdown);
94 LASSERT (kptllnd_data.kptl_n_active_peers <
95 kptllnd_data.kptl_expected_peers);
97 LASSERT (peer->peer_state == PEER_STATE_WAITING_HELLO ||
98 peer->peer_state == PEER_STATE_ACTIVE);
100 kptllnd_data.kptl_n_active_peers++;
101 atomic_inc(&peer->peer_refcount); /* +1 ref for the list */
103 /* NB add to HEAD of peer list for MRU order!
104 * (see kptllnd_cull_peertable) */
105 list_add(&peer->peer_list, kptllnd_nid2peerlist(peer->peer_id.nid));
109 kptllnd_cull_peertable_locked (lnet_process_id_t pid)
111 /* I'm about to add a new peer with this portals ID to the peer table,
112 * so (a) this peer should not exist already and (b) I want to leave at
113 * most (max_procs_per_nid - 1) peers with this NID in the table. */
114 struct list_head *peers = kptllnd_nid2peerlist(pid.nid);
115 int cull_count = *kptllnd_tunables.kptl_max_procs_per_node;
117 struct list_head *tmp;
118 struct list_head *nxt;
122 list_for_each_safe (tmp, nxt, peers) {
123 /* NB I rely on kptllnd_peer_add_peertable_locked to add peers
125 peer = list_entry(tmp, kptl_peer_t, peer_list);
127 if (peer->peer_id.nid != pid.nid)
130 LASSERT (peer->peer_id.pid != pid.pid);
134 if (count < cull_count) /* recent (don't cull) */
137 CDEBUG(D_NET, "Cull %s(%s)\n",
138 libcfs_id2str(peer->peer_id),
139 kptllnd_ptlid2str(peer->peer_ptlid));
141 kptllnd_peer_close_locked(peer, 0);
146 kptllnd_peer_allocate (lnet_process_id_t lpid, ptl_process_id_t ppid)
151 LIBCFS_ALLOC(peer, sizeof (*peer));
153 CERROR("Can't create peer %s (%s)\n",
155 kptllnd_ptlid2str(ppid));
159 memset(peer, 0, sizeof(*peer)); /* zero flags etc */
161 INIT_LIST_HEAD (&peer->peer_sendq);
162 INIT_LIST_HEAD (&peer->peer_activeq);
163 spin_lock_init (&peer->peer_lock);
165 peer->peer_state = PEER_STATE_ALLOCATED;
166 peer->peer_error = 0;
167 peer->peer_last_alive = cfs_time_current();
168 peer->peer_id = lpid;
169 peer->peer_ptlid = ppid;
170 peer->peer_credits = 1; /* enough for HELLO */
171 peer->peer_next_matchbits = PTL_RESERVED_MATCHBITS;
172 peer->peer_outstanding_credits = *kptllnd_tunables.kptl_peercredits - 1;
173 peer->peer_sent_credits = 1; /* HELLO credit is implicit */
174 peer->peer_max_msg_size = PTLLND_MIN_BUFFER_SIZE; /* until we know better */
176 atomic_set(&peer->peer_refcount, 1); /* 1 ref for caller */
178 write_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
180 peer->peer_myincarnation = kptllnd_data.kptl_incarnation;
182 /* Only increase # peers under lock, to guarantee we dont grow it
184 if (kptllnd_data.kptl_shutdown) {
185 write_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock,
187 LIBCFS_FREE(peer, sizeof(*peer));
191 kptllnd_data.kptl_npeers++;
192 write_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
198 kptllnd_peer_destroy (kptl_peer_t *peer)
202 CDEBUG(D_NET, "Peer=%p\n", peer);
204 LASSERT (!in_interrupt());
205 LASSERT (atomic_read(&peer->peer_refcount) == 0);
206 LASSERT (peer->peer_state == PEER_STATE_ALLOCATED ||
207 peer->peer_state == PEER_STATE_ZOMBIE);
208 LASSERT (list_empty(&peer->peer_sendq));
209 LASSERT (list_empty(&peer->peer_activeq));
211 write_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
213 if (peer->peer_state == PEER_STATE_ZOMBIE)
214 list_del(&peer->peer_list);
216 kptllnd_data.kptl_npeers--;
218 write_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
220 LIBCFS_FREE (peer, sizeof (*peer));
224 kptllnd_cancel_txlist (struct list_head *peerq, struct list_head *txs)
226 struct list_head *tmp;
227 struct list_head *nxt;
230 list_for_each_safe (tmp, nxt, peerq) {
231 tx = list_entry(tmp, kptl_tx_t, tx_list);
233 list_del(&tx->tx_list);
234 list_add_tail(&tx->tx_list, txs);
236 tx->tx_status = -EIO;
242 kptllnd_peer_cancel_txs(kptl_peer_t *peer, struct list_head *txs)
246 spin_lock_irqsave(&peer->peer_lock, flags);
248 kptllnd_cancel_txlist(&peer->peer_sendq, txs);
249 kptllnd_cancel_txlist(&peer->peer_activeq, txs);
251 spin_unlock_irqrestore(&peer->peer_lock, flags);
255 kptllnd_peer_alive (kptl_peer_t *peer)
257 /* This is racy, but everyone's only writing cfs_time_current() */
258 peer->peer_last_alive = cfs_time_current();
263 kptllnd_peer_notify (kptl_peer_t *peer)
266 time_t last_alive = 0;
269 spin_lock_irqsave(&peer->peer_lock, flags);
271 if (peer->peer_error != 0) {
272 error = peer->peer_error;
273 peer->peer_error = 0;
275 last_alive = cfs_time_current_sec() -
276 cfs_duration_sec(cfs_time_current() -
277 peer->peer_last_alive);
280 spin_unlock_irqrestore(&peer->peer_lock, flags);
283 lnet_notify (kptllnd_data.kptl_ni, peer->peer_id.nid, 0,
288 kptllnd_handle_closing_peers ()
291 struct list_head txs;
293 struct list_head *tmp;
294 struct list_head *nxt;
298 /* Check with a read lock first to avoid blocking anyone */
300 read_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
301 idle = list_empty(&kptllnd_data.kptl_closing_peers) &&
302 list_empty(&kptllnd_data.kptl_zombie_peers);
303 read_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
308 INIT_LIST_HEAD(&txs);
310 write_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
312 /* Cancel txs on all zombie peers. NB anyone dropping the last peer
313 * ref removes it from this list, so I musn't drop the lock while
315 list_for_each (tmp, &kptllnd_data.kptl_zombie_peers) {
316 peer = list_entry (tmp, kptl_peer_t, peer_list);
318 LASSERT (peer->peer_state == PEER_STATE_ZOMBIE);
320 kptllnd_peer_cancel_txs(peer, &txs);
323 /* Notify LNET and cancel txs on closing (i.e. newly closed) peers. NB
324 * I'm the only one removing from this list, but peers can be added on
325 * the end any time I drop the lock. */
327 list_for_each_safe (tmp, nxt, &kptllnd_data.kptl_closing_peers) {
328 peer = list_entry (tmp, kptl_peer_t, peer_list);
330 LASSERT (peer->peer_state == PEER_STATE_CLOSING);
332 list_del(&peer->peer_list);
333 list_add_tail(&peer->peer_list,
334 &kptllnd_data.kptl_zombie_peers);
335 peer->peer_state = PEER_STATE_ZOMBIE;
337 write_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
339 kptllnd_peer_notify(peer);
340 kptllnd_peer_cancel_txs(peer, &txs);
341 kptllnd_peer_decref(peer);
343 write_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
346 write_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
348 /* Drop peer's ref on all cancelled txs. This will get
349 * kptllnd_tx_fini() to abort outstanding comms if necessary. */
351 list_for_each_safe (tmp, nxt, &txs) {
352 tx = list_entry(tmp, kptl_tx_t, tx_list);
353 list_del(&tx->tx_list);
354 kptllnd_tx_decref(tx);
359 kptllnd_peer_close_locked(kptl_peer_t *peer, int why)
361 switch (peer->peer_state) {
365 case PEER_STATE_WAITING_HELLO:
366 case PEER_STATE_ACTIVE:
367 /* Ensure new peers see a new incarnation of me */
368 LASSERT(peer->peer_myincarnation <= kptllnd_data.kptl_incarnation);
369 if (peer->peer_myincarnation == kptllnd_data.kptl_incarnation)
370 kptllnd_data.kptl_incarnation++;
372 /* Removing from peer table */
373 kptllnd_data.kptl_n_active_peers--;
374 LASSERT (kptllnd_data.kptl_n_active_peers >= 0);
376 list_del(&peer->peer_list);
377 kptllnd_peer_unreserve_buffers();
379 peer->peer_error = why; /* stash 'why' only on first close */
380 peer->peer_state = PEER_STATE_CLOSING;
382 /* Schedule for immediate attention, taking peer table's ref */
383 list_add_tail(&peer->peer_list,
384 &kptllnd_data.kptl_closing_peers);
385 wake_up(&kptllnd_data.kptl_watchdog_waitq);
388 case PEER_STATE_ZOMBIE:
389 case PEER_STATE_CLOSING:
395 kptllnd_peer_close(kptl_peer_t *peer, int why)
399 write_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
400 kptllnd_peer_close_locked(peer, why);
401 write_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
405 kptllnd_peer_del(lnet_process_id_t id)
407 struct list_head *ptmp;
408 struct list_head *pnxt;
417 * Find the single bucket we are supposed to look at or if nid is a
418 * wildcard (LNET_NID_ANY) then look at all of the buckets
420 if (id.nid != LNET_NID_ANY) {
421 struct list_head *l = kptllnd_nid2peerlist(id.nid);
423 lo = hi = l - kptllnd_data.kptl_peers;
425 if (id.pid != LNET_PID_ANY)
429 hi = kptllnd_data.kptl_peer_hash_size - 1;
433 read_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
435 for (i = lo; i <= hi; i++) {
436 list_for_each_safe (ptmp, pnxt, &kptllnd_data.kptl_peers[i]) {
437 peer = list_entry (ptmp, kptl_peer_t, peer_list);
439 if (!(id.nid == LNET_NID_ANY ||
440 (peer->peer_id.nid == id.nid &&
441 (id.pid == LNET_PID_ANY ||
442 peer->peer_id.pid == id.pid))))
445 kptllnd_peer_addref(peer); /* 1 ref for me... */
447 read_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock,
450 kptllnd_peer_close(peer, 0);
451 kptllnd_peer_decref(peer); /* ...until here */
453 rc = 0; /* matched something */
455 /* start again now I've dropped the lock */
460 read_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
466 kptllnd_post_tx(kptl_peer_t *peer, kptl_tx_t *tx, int nfrag)
468 /* CAVEAT EMPTOR: I take over caller's ref on 'tx' */
469 ptl_handle_md_t msg_mdh;
474 LASSERT (!tx->tx_idle);
475 LASSERT (!tx->tx_active);
476 LASSERT (PtlHandleIsEqual(tx->tx_msg_mdh, PTL_INVALID_HANDLE));
477 LASSERT (PtlHandleIsEqual(tx->tx_rdma_mdh, PTL_INVALID_HANDLE));
478 LASSERT (tx->tx_type == TX_TYPE_SMALL_MESSAGE ||
479 tx->tx_type == TX_TYPE_PUT_REQUEST ||
480 tx->tx_type == TX_TYPE_GET_REQUEST);
482 kptllnd_set_tx_peer(tx, peer);
484 memset(&md, 0, sizeof(md));
486 md.threshold = tx->tx_acked ? 2 : 1; /* SEND END + ACK? */
487 md.options = PTL_MD_OP_PUT |
488 PTL_MD_LUSTRE_COMPLETION_SEMANTICS |
489 PTL_MD_EVENT_START_DISABLE;
490 md.user_ptr = &tx->tx_msg_eventarg;
491 md.eq_handle = kptllnd_data.kptl_eqh;
494 md.start = tx->tx_msg;
495 md.length = tx->tx_msg->ptlm_nob;
498 LASSERT (tx->tx_frags->iov[0].iov_base == (void *)tx->tx_msg);
500 md.start = tx->tx_frags;
502 md.options |= PTL_MD_IOVEC;
505 prc = PtlMDBind(kptllnd_data.kptl_nih, md, PTL_UNLINK, &msg_mdh);
507 CERROR("PtlMDBind(%s) failed: %s(%d)\n",
508 libcfs_id2str(peer->peer_id),
509 kptllnd_errtype2str(prc), prc);
510 tx->tx_status = -EIO;
511 kptllnd_tx_decref(tx);
515 spin_lock_irqsave(&peer->peer_lock, flags);
517 tx->tx_deadline = jiffies + (*kptllnd_tunables.kptl_timeout * HZ);
519 tx->tx_msg_mdh = msg_mdh;
521 /* Ensure HELLO is sent first */
522 if (tx->tx_msg->ptlm_type == PTLLND_MSG_TYPE_HELLO)
523 list_add(&tx->tx_list, &peer->peer_sendq);
525 list_add_tail(&tx->tx_list, &peer->peer_sendq);
527 spin_unlock_irqrestore(&peer->peer_lock, flags);
531 kptllnd_peer_check_sends (kptl_peer_t *peer)
538 LASSERT(!in_interrupt());
540 spin_lock_irqsave(&peer->peer_lock, flags);
542 peer->peer_retry_noop = 0;
544 if (list_empty(&peer->peer_sendq) &&
545 peer->peer_outstanding_credits >= PTLLND_CREDIT_HIGHWATER &&
546 peer->peer_credits != 0) {
548 /* post a NOOP to return credits */
549 spin_unlock_irqrestore(&peer->peer_lock, flags);
551 tx = kptllnd_get_idle_tx(TX_TYPE_SMALL_MESSAGE);
553 CERROR("Can't return credits to %s: can't allocate descriptor\n",
554 libcfs_id2str(peer->peer_id));
556 kptllnd_init_msg(tx->tx_msg, PTLLND_MSG_TYPE_NOOP, 0);
557 kptllnd_post_tx(peer, tx, 0);
560 spin_lock_irqsave(&peer->peer_lock, flags);
561 peer->peer_retry_noop = (tx == NULL);
564 while (!list_empty(&peer->peer_sendq)) {
565 tx = list_entry (peer->peer_sendq.next, kptl_tx_t, tx_list);
567 LASSERT (tx->tx_active);
568 LASSERT (!PtlHandleIsEqual(tx->tx_msg_mdh, PTL_INVALID_HANDLE));
569 LASSERT (PtlHandleIsEqual(tx->tx_rdma_mdh, PTL_INVALID_HANDLE));
571 LASSERT (peer->peer_outstanding_credits >= 0);
572 LASSERT (peer->peer_sent_credits >= 0);
573 LASSERT (peer->peer_sent_credits +
574 peer->peer_outstanding_credits <=
575 *kptllnd_tunables.kptl_peercredits);
576 LASSERT (peer->peer_credits >= 0);
578 /* Ensure HELLO is sent first */
579 if (!peer->peer_sent_hello) {
580 if (tx->tx_msg->ptlm_type != PTLLND_MSG_TYPE_HELLO)
582 peer->peer_sent_hello = 1;
585 if (peer->peer_credits == 0) {
586 CDEBUG(D_NETTRACE, "%s[%d/%d+%d]: no credits for %p\n",
587 libcfs_id2str(peer->peer_id),
589 peer->peer_outstanding_credits,
590 peer->peer_sent_credits, tx);
594 /* Don't use the last credit unless I've got credits to
596 if (peer->peer_credits == 1 &&
597 peer->peer_outstanding_credits == 0) {
598 CDEBUG(D_NETTRACE, "%s[%d/%d+%d]: "
599 "not using last credit for %p\n",
600 libcfs_id2str(peer->peer_id),
602 peer->peer_outstanding_credits,
603 peer->peer_sent_credits, tx);
607 list_del(&tx->tx_list);
609 /* Discard any NOOP I queued if I'm not at the high-water mark
610 * any more or more messages have been queued */
611 if (tx->tx_msg->ptlm_type == PTLLND_MSG_TYPE_NOOP &&
612 (!list_empty(&peer->peer_sendq) ||
613 peer->peer_outstanding_credits < PTLLND_CREDIT_HIGHWATER)) {
617 spin_unlock_irqrestore(&peer->peer_lock, flags);
619 CDEBUG(D_NET, "%s: redundant noop\n",
620 libcfs_id2str(peer->peer_id));
621 kptllnd_tx_decref(tx);
623 spin_lock_irqsave(&peer->peer_lock, flags);
627 /* fill last-minute msg fields */
628 kptllnd_msg_pack(tx->tx_msg, peer);
630 if (tx->tx_type == TX_TYPE_PUT_REQUEST ||
631 tx->tx_type == TX_TYPE_GET_REQUEST) {
632 /* peer_next_matchbits must be known good */
633 LASSERT (peer->peer_state >= PEER_STATE_ACTIVE);
634 /* Assume 64-bit matchbits can't wrap */
635 LASSERT (peer->peer_next_matchbits >= PTL_RESERVED_MATCHBITS);
636 tx->tx_msg->ptlm_u.rdma.kptlrm_matchbits =
637 peer->peer_next_matchbits++;
640 peer->peer_sent_credits += peer->peer_outstanding_credits;
641 peer->peer_outstanding_credits = 0;
642 peer->peer_credits--;
644 CDEBUG(D_NETTRACE, "%s[%d/%d+%d]: %s tx=%p nob=%d cred=%d\n",
645 libcfs_id2str(peer->peer_id), peer->peer_credits,
646 peer->peer_outstanding_credits, peer->peer_sent_credits,
647 kptllnd_msgtype2str(tx->tx_msg->ptlm_type),
648 tx, tx->tx_msg->ptlm_nob,
649 tx->tx_msg->ptlm_credits);
651 list_add_tail(&tx->tx_list, &peer->peer_activeq);
653 kptllnd_tx_addref(tx); /* 1 ref for me... */
655 spin_unlock_irqrestore(&peer->peer_lock, flags);
657 if (tx->tx_type == TX_TYPE_PUT_REQUEST ||
658 tx->tx_type == TX_TYPE_GET_REQUEST) {
659 /* Post bulk now we have safe matchbits */
660 rc = PtlMEAttach(kptllnd_data.kptl_nih,
661 *kptllnd_tunables.kptl_portal,
663 tx->tx_msg->ptlm_u.rdma.kptlrm_matchbits,
669 CERROR("PtlMEAttach(%s) failed: %s(%d)\n",
670 libcfs_id2str(peer->peer_id),
671 kptllnd_errtype2str(rc), rc);
675 rc = PtlMDAttach(meh, tx->tx_rdma_md, PTL_UNLINK,
678 CERROR("PtlMDAttach(%s) failed: %s(%d)\n",
679 libcfs_id2str(tx->tx_peer->peer_id),
680 kptllnd_errtype2str(rc), rc);
681 rc = PtlMEUnlink(meh);
682 LASSERT(rc == PTL_OK);
683 tx->tx_rdma_mdh = PTL_INVALID_HANDLE;
686 /* I'm not racing with the event callback here. It's a
687 * bug if there's an event on the MD I just attached
688 * before I actually send the RDMA request message -
689 * probably matchbits re-used in error. */
692 tx->tx_tposted = jiffies; /* going on the wire */
694 rc = PtlPut (tx->tx_msg_mdh,
695 tx->tx_acked ? PTL_ACK_REQ : PTL_NOACK_REQ,
697 *kptllnd_tunables.kptl_portal,
701 0); /* header data */
703 CERROR("PtlPut %s error %s(%d)\n",
704 libcfs_id2str(peer->peer_id),
705 kptllnd_errtype2str(rc), rc);
709 kptllnd_tx_decref(tx); /* drop my ref */
711 spin_lock_irqsave(&peer->peer_lock, flags);
714 spin_unlock_irqrestore(&peer->peer_lock, flags);
718 /* Nuke everything (including tx we were trying) */
719 kptllnd_peer_close(peer, -EIO);
720 kptllnd_tx_decref(tx);
724 kptllnd_find_timed_out_tx(kptl_peer_t *peer)
727 struct list_head *ele;
729 list_for_each(ele, &peer->peer_sendq) {
730 tx = list_entry(ele, kptl_tx_t, tx_list);
732 if (time_after_eq(jiffies, tx->tx_deadline)) {
733 kptllnd_tx_addref(tx);
738 list_for_each(ele, &peer->peer_activeq) {
739 tx = list_entry(ele, kptl_tx_t, tx_list);
741 if (time_after_eq(jiffies, tx->tx_deadline)) {
742 kptllnd_tx_addref(tx);
752 kptllnd_peer_check_bucket (int idx, int stamp)
754 struct list_head *peers = &kptllnd_data.kptl_peers[idx];
755 struct list_head *ptmp;
763 CDEBUG(D_NET, "Bucket=%d, stamp=%d\n", idx, stamp);
766 /* NB. Shared lock while I just look */
767 read_lock_irqsave(&kptllnd_data.kptl_peer_rw_lock, flags);
769 list_for_each (ptmp, peers) {
770 peer = list_entry (ptmp, kptl_peer_t, peer_list);
772 CDEBUG(D_NET, "Peer=%s Credits=%d Outstanding=%d Send=%d\n",
773 libcfs_id2str(peer->peer_id), peer->peer_credits,
774 peer->peer_outstanding_credits, peer->peer_sent_credits);
776 spin_lock(&peer->peer_lock);
778 if (peer->peer_check_stamp == stamp) {
779 /* checked already this pass */
780 spin_unlock(&peer->peer_lock);
784 peer->peer_check_stamp = stamp;
785 tx = kptllnd_find_timed_out_tx(peer);
786 check_sends = peer->peer_retry_noop;
788 spin_unlock(&peer->peer_lock);
790 if (tx == NULL && !check_sends)
793 kptllnd_peer_addref(peer); /* 1 ref for me... */
795 read_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
797 if (tx == NULL) { /* nothing timed out */
798 kptllnd_peer_check_sends(peer);
799 kptllnd_peer_decref(peer); /* ...until here or... */
801 /* rescan after dropping the lock */
805 spin_lock_irqsave(&peer->peer_lock, flags);
806 nsend = kptllnd_count_queue(&peer->peer_sendq);
807 nactive = kptllnd_count_queue(&peer->peer_activeq);
808 spin_unlock_irqrestore(&peer->peer_lock, flags);
810 LCONSOLE_ERROR_MSG(0x126, "Timing out %s: %s\n",
811 libcfs_id2str(peer->peer_id),
812 (tx->tx_tposted == 0) ?
813 "no free peer buffers" :
814 "please check Portals");
816 CERROR("%s timed out: cred %d outstanding %d, sent %d, "
817 "sendq %d, activeq %d Tx %p %s (%s%s%s) status %d "
818 "%sposted %lu T/O %ds\n",
819 libcfs_id2str(peer->peer_id), peer->peer_credits,
820 peer->peer_outstanding_credits, peer->peer_sent_credits,
821 nsend, nactive, tx, kptllnd_tx_typestr(tx->tx_type),
822 tx->tx_active ? "A" : "",
823 PtlHandleIsEqual(tx->tx_msg_mdh, PTL_INVALID_HANDLE) ?
825 PtlHandleIsEqual(tx->tx_rdma_mdh, PTL_INVALID_HANDLE) ?
828 (tx->tx_tposted == 0) ? "not " : "",
829 (tx->tx_tposted == 0) ? 0UL : (jiffies - tx->tx_tposted),
830 *kptllnd_tunables.kptl_timeout);
832 kptllnd_dump_ptltrace();
834 kptllnd_tx_decref(tx);
836 kptllnd_peer_close(peer, -ETIMEDOUT);
837 kptllnd_peer_decref(peer); /* ...until here */
839 /* start again now I've dropped the lock */
843 read_unlock_irqrestore(&kptllnd_data.kptl_peer_rw_lock, flags);
847 kptllnd_id2peer_locked (lnet_process_id_t id)
849 struct list_head *peers = kptllnd_nid2peerlist(id.nid);
850 struct list_head *tmp;
853 list_for_each (tmp, peers) {
855 peer = list_entry (tmp, kptl_peer_t, peer_list);
857 LASSERT(peer->peer_state == PEER_STATE_WAITING_HELLO ||
858 peer->peer_state == PEER_STATE_ACTIVE);
860 if (peer->peer_id.nid != id.nid ||
861 peer->peer_id.pid != id.pid)
864 kptllnd_peer_addref(peer);
866 CDEBUG(D_NET, "%s -> %s (%d)\n",
868 kptllnd_ptlid2str(peer->peer_ptlid),
869 atomic_read (&peer->peer_refcount));
877 kptllnd_peertable_overflow_msg(char *str, lnet_process_id_t id)
879 LCONSOLE_ERROR_MSG(0x127, "%s %s overflows the peer table[%d]: "
880 "messages may be dropped\n",
881 str, libcfs_id2str(id),
882 kptllnd_data.kptl_n_active_peers);
883 LCONSOLE_ERROR_MSG(0x128, "Please correct by increasing "
884 "'max_nodes' or 'max_procs_per_node'\n");
888 kptllnd_get_last_seen_matchbits_locked(lnet_process_id_t lpid)
891 struct list_head *tmp;
893 /* Find the last matchbits I saw this new peer using. Note..
894 A. This peer cannot be in the peer table - she's new!
895 B. If I can't find the peer in the closing/zombie peers, all
896 matchbits are safe because all refs to the (old) peer have gone
897 so all txs have completed so there's no risk of matchbit
901 LASSERT(kptllnd_id2peer_locked(lpid) == NULL);
903 /* peer's last matchbits can't change after it comes out of the peer
904 * table, so first match is fine */
906 list_for_each (tmp, &kptllnd_data.kptl_closing_peers) {
907 peer = list_entry (tmp, kptl_peer_t, peer_list);
909 if (peer->peer_id.nid == lpid.nid &&
910 peer->peer_id.pid == lpid.pid)
911 return peer->peer_last_matchbits_seen;
914 list_for_each (tmp, &kptllnd_data.kptl_zombie_peers) {
915 peer = list_entry (tmp, kptl_peer_t, peer_list);
917 if (peer->peer_id.nid == lpid.nid &&
918 peer->peer_id.pid == lpid.pid)
919 return peer->peer_last_matchbits_seen;
922 return PTL_RESERVED_MATCHBITS;
926 kptllnd_peer_handle_hello (ptl_process_id_t initiator,
929 rwlock_t *g_lock = &kptllnd_data.kptl_peer_rw_lock;
931 kptl_peer_t *new_peer;
932 lnet_process_id_t lpid;
936 __u64 safe_matchbits;
937 __u64 last_matchbits_seen;
939 lpid.nid = msg->ptlm_srcnid;
940 lpid.pid = msg->ptlm_srcpid;
942 CDEBUG(D_NET, "hello from %s(%s)\n",
943 libcfs_id2str(lpid), kptllnd_ptlid2str(initiator));
945 if (initiator.pid != kptllnd_data.kptl_portals_id.pid &&
946 (msg->ptlm_srcpid & LNET_PID_USERFLAG) == 0) {
947 /* If the peer's PID isn't _the_ ptllnd kernel pid, she must be
948 * userspace. Refuse the connection if she hasn't set the
949 * correct flag in her PID... */
950 CERROR("Userflag not set in hello from %s (%s)\n",
951 libcfs_id2str(lpid), kptllnd_ptlid2str(initiator));
955 /* kptlhm_matchbits are the highest matchbits my peer may have used to
956 * RDMA to me. I ensure I never register buffers for RDMA that could
957 * match any she used */
958 safe_matchbits = msg->ptlm_u.hello.kptlhm_matchbits + 1;
960 if (safe_matchbits < PTL_RESERVED_MATCHBITS) {
961 CERROR("Illegal matchbits "LPX64" in HELLO from %s\n",
962 safe_matchbits, libcfs_id2str(lpid));
966 if (msg->ptlm_u.hello.kptlhm_max_msg_size < PTLLND_MIN_BUFFER_SIZE) {
967 CERROR("%s: max message size %d < MIN %d",
969 msg->ptlm_u.hello.kptlhm_max_msg_size,
970 PTLLND_MIN_BUFFER_SIZE);
974 if (msg->ptlm_credits <= 1) {
975 CERROR("Need more than 1+%d credits from %s\n",
976 msg->ptlm_credits, libcfs_id2str(lpid));
980 write_lock_irqsave(g_lock, flags);
982 peer = kptllnd_id2peer_locked(lpid);
984 if (peer->peer_state == PEER_STATE_WAITING_HELLO) {
985 /* Completing HELLO handshake */
986 LASSERT(peer->peer_incarnation == 0);
988 if (msg->ptlm_dststamp != 0 &&
989 msg->ptlm_dststamp != peer->peer_myincarnation) {
990 write_unlock_irqrestore(g_lock, flags);
992 CERROR("Ignoring HELLO from %s: unexpected "
993 "dststamp "LPX64" ("LPX64" wanted)\n",
996 peer->peer_myincarnation);
997 kptllnd_peer_decref(peer);
1001 /* Concurrent initiation or response to my HELLO */
1002 peer->peer_state = PEER_STATE_ACTIVE;
1003 peer->peer_incarnation = msg->ptlm_srcstamp;
1004 peer->peer_next_matchbits = safe_matchbits;
1005 peer->peer_max_msg_size =
1006 msg->ptlm_u.hello.kptlhm_max_msg_size;
1008 write_unlock_irqrestore(g_lock, flags);
1012 if (msg->ptlm_dststamp != 0 &&
1013 msg->ptlm_dststamp <= peer->peer_myincarnation) {
1014 write_unlock_irqrestore(g_lock, flags);
1016 CERROR("Ignoring stale HELLO from %s: "
1017 "dststamp "LPX64" (current "LPX64")\n",
1018 libcfs_id2str(lpid),
1020 peer->peer_myincarnation);
1021 kptllnd_peer_decref(peer);
1025 /* Brand new connection attempt: remove old incarnation */
1026 kptllnd_peer_close_locked(peer, 0);
1029 kptllnd_cull_peertable_locked(lpid);
1031 write_unlock_irqrestore(g_lock, flags);
1034 CDEBUG(D_NET, "Peer %s (%s) reconnecting:"
1035 " stamp "LPX64"("LPX64")\n",
1036 libcfs_id2str(lpid), kptllnd_ptlid2str(initiator),
1037 msg->ptlm_srcstamp, peer->peer_incarnation);
1039 kptllnd_peer_decref(peer);
1042 hello_tx = kptllnd_get_idle_tx(TX_TYPE_SMALL_MESSAGE);
1043 if (hello_tx == NULL) {
1044 CERROR("Unable to allocate HELLO message for %s\n",
1045 libcfs_id2str(lpid));
1049 kptllnd_init_msg(hello_tx->tx_msg, PTLLND_MSG_TYPE_HELLO,
1050 sizeof(kptl_hello_msg_t));
1052 new_peer = kptllnd_peer_allocate(lpid, initiator);
1053 if (new_peer == NULL) {
1054 kptllnd_tx_decref(hello_tx);
1058 rc = kptllnd_peer_reserve_buffers();
1060 kptllnd_peer_decref(new_peer);
1061 kptllnd_tx_decref(hello_tx);
1063 CERROR("Failed to reserve buffers for %s\n",
1064 libcfs_id2str(lpid));
1068 write_lock_irqsave(g_lock, flags);
1071 if (kptllnd_data.kptl_shutdown) {
1072 write_unlock_irqrestore(g_lock, flags);
1074 CERROR ("Shutdown started, refusing connection from %s\n",
1075 libcfs_id2str(lpid));
1076 kptllnd_peer_unreserve_buffers();
1077 kptllnd_peer_decref(new_peer);
1078 kptllnd_tx_decref(hello_tx);
1082 peer = kptllnd_id2peer_locked(lpid);
1084 if (peer->peer_state == PEER_STATE_WAITING_HELLO) {
1085 /* An outgoing message instantiated 'peer' for me */
1086 LASSERT(peer->peer_incarnation == 0);
1088 peer->peer_state = PEER_STATE_ACTIVE;
1089 peer->peer_incarnation = msg->ptlm_srcstamp;
1090 peer->peer_next_matchbits = safe_matchbits;
1091 peer->peer_max_msg_size =
1092 msg->ptlm_u.hello.kptlhm_max_msg_size;
1094 write_unlock_irqrestore(g_lock, flags);
1096 CWARN("Outgoing instantiated peer %s\n",
1097 libcfs_id2str(lpid));
1099 LASSERT (peer->peer_state == PEER_STATE_ACTIVE);
1101 write_unlock_irqrestore(g_lock, flags);
1103 /* WOW! Somehow this peer completed the HELLO
1104 * handshake while I slept. I guess I could have slept
1105 * while it rebooted and sent a new HELLO, so I'll fail
1107 CWARN("Wow! peer %s\n", libcfs_id2str(lpid));
1108 kptllnd_peer_decref(peer);
1112 kptllnd_peer_unreserve_buffers();
1113 kptllnd_peer_decref(new_peer);
1114 kptllnd_tx_decref(hello_tx);
1118 if (kptllnd_data.kptl_n_active_peers ==
1119 kptllnd_data.kptl_expected_peers) {
1120 /* peer table full */
1121 write_unlock_irqrestore(g_lock, flags);
1123 kptllnd_peertable_overflow_msg("Connection from ", lpid);
1125 rc = kptllnd_reserve_buffers(1); /* HELLO headroom */
1127 CERROR("Refusing connection from %s\n",
1128 libcfs_id2str(lpid));
1129 kptllnd_peer_unreserve_buffers();
1130 kptllnd_peer_decref(new_peer);
1131 kptllnd_tx_decref(hello_tx);
1135 write_lock_irqsave(g_lock, flags);
1136 kptllnd_data.kptl_expected_peers++;
1140 last_matchbits_seen = kptllnd_get_last_seen_matchbits_locked(lpid);
1142 hello_tx->tx_msg->ptlm_u.hello.kptlhm_matchbits = last_matchbits_seen;
1143 hello_tx->tx_msg->ptlm_u.hello.kptlhm_max_msg_size =
1144 *kptllnd_tunables.kptl_max_msg_size;
1146 new_peer->peer_state = PEER_STATE_ACTIVE;
1147 new_peer->peer_incarnation = msg->ptlm_srcstamp;
1148 new_peer->peer_next_matchbits = safe_matchbits;
1149 new_peer->peer_last_matchbits_seen = last_matchbits_seen;
1150 new_peer->peer_max_msg_size = msg->ptlm_u.hello.kptlhm_max_msg_size;
1152 kptllnd_peer_add_peertable_locked(new_peer);
1154 write_unlock_irqrestore(g_lock, flags);
1156 /* NB someone else could get in now and post a message before I post
1157 * the HELLO, but post_tx/check_sends take care of that! */
1159 CDEBUG(D_NETTRACE, "%s: post response hello %p\n",
1160 libcfs_id2str(new_peer->peer_id), hello_tx);
1162 kptllnd_post_tx(new_peer, hello_tx, 0);
1163 kptllnd_peer_check_sends(new_peer);
1169 kptllnd_tx_launch(kptl_peer_t *peer, kptl_tx_t *tx, int nfrag)
1171 kptllnd_post_tx(peer, tx, nfrag);
1172 kptllnd_peer_check_sends(peer);
1176 kptllnd_find_target(kptl_peer_t **peerp, lnet_process_id_t target)
1178 rwlock_t *g_lock = &kptllnd_data.kptl_peer_rw_lock;
1179 ptl_process_id_t ptl_id;
1180 kptl_peer_t *new_peer;
1181 kptl_tx_t *hello_tx;
1182 unsigned long flags;
1184 __u64 last_matchbits_seen;
1186 /* I expect to find the peer, so I only take a read lock... */
1187 read_lock_irqsave(g_lock, flags);
1188 *peerp = kptllnd_id2peer_locked(target);
1189 read_unlock_irqrestore(g_lock, flags);
1194 if ((target.pid & LNET_PID_USERFLAG) != 0) {
1195 CWARN("Refusing to create a new connection to %s "
1196 "(non-kernel peer)\n", libcfs_id2str(target));
1197 return -EHOSTUNREACH;
1200 /* The new peer is a kernel ptllnd, and kernel ptllnds all have
1201 * the same portals PID */
1202 ptl_id.nid = kptllnd_lnet2ptlnid(target.nid);
1203 ptl_id.pid = kptllnd_data.kptl_portals_id.pid;
1205 hello_tx = kptllnd_get_idle_tx(TX_TYPE_SMALL_MESSAGE);
1206 if (hello_tx == NULL) {
1207 CERROR("Unable to allocate connect message for %s\n",
1208 libcfs_id2str(target));
1212 kptllnd_init_msg(hello_tx->tx_msg, PTLLND_MSG_TYPE_HELLO,
1213 sizeof(kptl_hello_msg_t));
1215 new_peer = kptllnd_peer_allocate(target, ptl_id);
1216 if (new_peer == NULL) {
1221 rc = kptllnd_peer_reserve_buffers();
1225 write_lock_irqsave(g_lock, flags);
1227 if (kptllnd_data.kptl_shutdown) {
1228 write_unlock_irqrestore(g_lock, flags);
1233 *peerp = kptllnd_id2peer_locked(target);
1234 if (*peerp != NULL) {
1235 write_unlock_irqrestore(g_lock, flags);
1239 kptllnd_cull_peertable_locked(target);
1241 if (kptllnd_data.kptl_n_active_peers ==
1242 kptllnd_data.kptl_expected_peers) {
1243 /* peer table full */
1244 write_unlock_irqrestore(g_lock, flags);
1246 kptllnd_peertable_overflow_msg("Connection to ", target);
1248 rc = kptllnd_reserve_buffers(1); /* HELLO headroom */
1250 CERROR("Can't create connection to %s\n",
1251 libcfs_id2str(target));
1255 write_lock_irqsave(g_lock, flags);
1256 kptllnd_data.kptl_expected_peers++;
1260 last_matchbits_seen = kptllnd_get_last_seen_matchbits_locked(target);
1262 hello_tx->tx_msg->ptlm_u.hello.kptlhm_matchbits = last_matchbits_seen;
1263 hello_tx->tx_msg->ptlm_u.hello.kptlhm_max_msg_size =
1264 *kptllnd_tunables.kptl_max_msg_size;
1266 new_peer->peer_state = PEER_STATE_WAITING_HELLO;
1267 new_peer->peer_last_matchbits_seen = last_matchbits_seen;
1269 kptllnd_peer_add_peertable_locked(new_peer);
1271 write_unlock_irqrestore(g_lock, flags);
1273 /* NB someone else could get in now and post a message before I post
1274 * the HELLO, but post_tx/check_sends take care of that! */
1276 CDEBUG(D_NETTRACE, "%s: post initial hello %p\n",
1277 libcfs_id2str(new_peer->peer_id), hello_tx);
1279 kptllnd_post_tx(new_peer, hello_tx, 0);
1280 kptllnd_peer_check_sends(new_peer);
1286 kptllnd_peer_unreserve_buffers();
1288 kptllnd_peer_decref(new_peer);
1290 kptllnd_tx_decref(hello_tx);