4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/include/lnet/lib-types.h
34 * Types used by the library side routines that do not need to be
35 * exposed to the user application
38 #ifndef __LNET_LIB_TYPES_H__
39 #define __LNET_LIB_TYPES_H__
42 # error This include is only for kernel use.
45 #include <linux/kthread.h>
46 #include <linux/uio.h>
47 #include <linux/semaphore.h>
48 #include <linux/types.h>
50 #include <uapi/linux/lnet/lnet-dlc.h>
51 #include <uapi/linux/lnet/lnetctl.h>
52 #include <uapi/linux/lnet/nidstr.h>
54 /* Max payload size */
55 #define LNET_MAX_PAYLOAD LNET_MTU
57 /** limit on the number of fragments in discontiguous MDs */
58 #define LNET_MAX_IOV 256
61 * This is the maximum health value.
62 * All local and peer NIs created have their health default to this value.
64 #define LNET_MAX_HEALTH_VALUE 1000
65 #define LNET_MAX_SELECTION_PRIORITY UINT_MAX
70 enum lnet_msg_hstatus {
71 LNET_MSG_STATUS_OK = 0,
72 LNET_MSG_STATUS_LOCAL_INTERRUPT,
73 LNET_MSG_STATUS_LOCAL_DROPPED,
74 LNET_MSG_STATUS_LOCAL_ABORTED,
75 LNET_MSG_STATUS_LOCAL_NO_ROUTE,
76 LNET_MSG_STATUS_LOCAL_ERROR,
77 LNET_MSG_STATUS_LOCAL_TIMEOUT,
78 LNET_MSG_STATUS_REMOTE_ERROR,
79 LNET_MSG_STATUS_REMOTE_DROPPED,
80 LNET_MSG_STATUS_REMOTE_TIMEOUT,
81 LNET_MSG_STATUS_NETWORK_TIMEOUT,
85 struct lnet_rsp_tracker {
86 /* chain on the waiting list */
87 struct list_head rspt_on_list;
91 lnet_nid_t rspt_next_hop_nid;
92 /* deadline of the REPLY/ACK */
93 ktime_t rspt_deadline;
95 struct lnet_handle_md rspt_mdh;
99 struct list_head msg_activelist;
100 struct list_head msg_list; /* Q for credits/MD */
102 struct lnet_process_id msg_target;
103 /* Primary NID of the source. */
104 lnet_nid_t msg_initiator;
105 /* where is it from, it's only for building event */
110 * hold parameters in case message is with held due
113 lnet_nid_t msg_src_nid_param;
114 lnet_nid_t msg_rtr_nid_param;
117 * Deadline for the message after which it will be finalized if it
120 ktime_t msg_deadline;
122 /* The message health status. */
123 enum lnet_msg_hstatus msg_health_status;
124 /* This is a recovery message */
126 /* the number of times a transmission has been retried */
128 /* flag to indicate that we do not want to resend this message */
131 /* committed for sending */
132 unsigned int msg_tx_committed:1;
133 /* CPT # this message committed for sending */
134 unsigned int msg_tx_cpt:15;
135 /* committed for receiving */
136 unsigned int msg_rx_committed:1;
137 /* CPT # this message committed for receiving */
138 unsigned int msg_rx_cpt:15;
139 /* queued for tx credit */
140 unsigned int msg_tx_delayed:1;
141 /* queued for RX buffer */
142 unsigned int msg_rx_delayed:1;
143 /* ready for pending on RX delay list */
144 unsigned int msg_rx_ready_delay:1;
146 unsigned int msg_vmflush:1; /* VM trying to free memory */
147 unsigned int msg_target_is_router:1; /* sending to a router */
148 unsigned int msg_routing:1; /* being forwarded */
149 unsigned int msg_ack:1; /* ack on finalize (PUT) */
150 unsigned int msg_sending:1; /* outgoing message */
151 unsigned int msg_receiving:1; /* being received */
152 unsigned int msg_txcredit:1; /* taken an NI send credit */
153 unsigned int msg_peertxcredit:1; /* taken a peer send credit */
154 unsigned int msg_rtrcredit:1; /* taken a globel router credit */
155 unsigned int msg_peerrtrcredit:1; /* taken a peer router credit */
156 unsigned int msg_onactivelist:1; /* on the activelist */
157 unsigned int msg_rdma_get:1;
159 struct lnet_peer_ni *msg_txpeer; /* peer I'm sending to */
160 struct lnet_peer_ni *msg_rxpeer; /* peer I received from */
163 struct lnet_libmd *msg_md;
164 /* the NI the message was sent or received over */
165 struct lnet_ni *msg_txni;
166 struct lnet_ni *msg_rxni;
168 unsigned int msg_len;
169 unsigned int msg_wanted;
170 unsigned int msg_offset;
171 unsigned int msg_niov;
172 struct bio_vec *msg_kiov;
174 struct lnet_event msg_ev;
175 struct lnet_hdr msg_hdr;
178 struct lnet_libhandle {
179 struct list_head lh_hash_chain;
183 #define lh_entry(ptr, type, member) \
184 ((type *)((char *)(ptr)-(char *)(&((type *)0)->member)))
187 struct list_head me_list;
189 struct lnet_process_id me_match_id;
190 unsigned int me_portal;
191 unsigned int me_pos; /* hash offset in mt_hash */
193 __u64 me_ignore_bits;
194 enum lnet_unlink me_unlink;
195 struct lnet_libmd *me_md;
199 struct list_head md_list;
200 struct lnet_libhandle md_lh;
201 struct lnet_me *md_me;
203 unsigned int md_offset;
204 unsigned int md_length;
205 unsigned int md_max_size;
208 unsigned int md_options;
209 unsigned int md_flags;
210 unsigned int md_niov; /* # frags at end of struct */
212 struct lnet_rsp_tracker *md_rspt_ptr;
213 lnet_handler_t md_handler;
214 struct lnet_handle_md md_bulk_handle;
215 struct bio_vec md_kiov[LNET_MAX_IOV];
218 #define LNET_MD_FLAG_ZOMBIE BIT(0)
219 #define LNET_MD_FLAG_AUTO_UNLINK BIT(1)
220 #define LNET_MD_FLAG_ABORTED BIT(2)
221 /* LNET_MD_FLAG_HANDLING is set when a non-unlink event handler
222 * is being called for an event relating to the md.
223 * It ensures only one such handler runs at a time.
224 * The final "unlink" event is only called once the
225 * md_refcount has reached zero, and this flag has been cleared,
226 * ensuring that it doesn't race with any other event handler
229 #define LNET_MD_FLAG_HANDLING BIT(3)
230 #define LNET_MD_FLAG_DISCARD BIT(4)
232 struct lnet_test_peer {
233 /* info about peers we are trying to fail */
234 struct list_head tp_list; /* ln_test_peers */
235 lnet_nid_t tp_nid; /* matching nid */
236 unsigned int tp_threshold; /* # failures to simulate */
239 #define LNET_COOKIE_TYPE_MD 1
240 #define LNET_COOKIE_TYPE_ME 2
241 #define LNET_COOKIE_TYPE_EQ 3
242 #define LNET_COOKIE_TYPE_BITS 2
243 #define LNET_COOKIE_MASK ((1ULL << LNET_COOKIE_TYPE_BITS) - 1ULL)
245 struct lnet_ni; /* forward ref */
249 /* fields initialized by the LND */
252 int (*lnd_startup)(struct lnet_ni *ni);
253 void (*lnd_shutdown)(struct lnet_ni *ni);
254 int (*lnd_ctl)(struct lnet_ni *ni, unsigned int cmd, void *arg);
256 /* In data movement APIs below, payload buffers are described as a set
257 * of 'niov' fragments which are in pages.
258 * The LND may NOT overwrite these fragment descriptors.
259 * An 'offset' and may specify a byte offset within the set of
260 * fragments to start from
263 /* Start sending a preformatted message. 'private' is NULL for PUT and
264 * GET messages; otherwise this is a response to an incoming message
265 * and 'private' is the 'private' passed to lnet_parse(). Return
266 * non-zero for immediate failure, otherwise complete later with
268 int (*lnd_send)(struct lnet_ni *ni, void *private,
269 struct lnet_msg *msg);
271 /* Start receiving 'mlen' bytes of payload data, skipping the following
272 * 'rlen' - 'mlen' bytes. 'private' is the 'private' passed to
273 * lnet_parse(). Return non-zero for immedaite failure, otherwise
274 * complete later with lnet_finalize(). This also gives back a receive
275 * credit if the LND does flow control. */
276 int (*lnd_recv)(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
277 int delayed, unsigned int niov,
278 struct bio_vec *kiov,
279 unsigned int offset, unsigned int mlen, unsigned int rlen);
281 /* lnet_parse() has had to delay processing of this message
282 * (e.g. waiting for a forwarding buffer or send credits). Give the
283 * LND a chance to free urgently needed resources. If called, return 0
284 * for success and do NOT give back a receive credit; that has to wait
285 * until lnd_recv() gets called. On failure return < 0 and
286 * release resources; lnd_recv() will not be called. */
287 int (*lnd_eager_recv)(struct lnet_ni *ni, void *private,
288 struct lnet_msg *msg, void **new_privatep);
290 /* notification of peer down */
291 void (*lnd_notify_peer_down)(lnet_nid_t peer);
293 /* accept a new connection */
294 int (*lnd_accept)(struct lnet_ni *ni, struct socket *sock);
297 struct lnet_tx_queue {
298 int tq_credits; /* # tx credits free */
299 int tq_credits_min; /* lowest it's been */
300 int tq_credits_max; /* total # tx credits */
301 struct list_head tq_delayed; /* delayed TXs */
304 enum lnet_net_state {
305 /* set when net block is allocated */
306 LNET_NET_STATE_INIT = 0,
307 /* set when NIs in net are started successfully */
308 LNET_NET_STATE_ACTIVE,
309 /* set if all NIs in net are in FAILED state */
310 LNET_NET_STATE_INACTIVE,
311 /* set when shutting down a NET */
312 LNET_NET_STATE_DELETING
316 /* initial state when NI is created */
317 LNET_NI_STATE_INIT = 0,
318 /* set when NI is brought up */
319 LNET_NI_STATE_ACTIVE,
320 /* set when NI is being shutdown */
321 LNET_NI_STATE_DELETING,
324 #define LNET_NI_RECOVERY_PENDING BIT(0)
325 #define LNET_NI_RECOVERY_FAILED BIT(1)
327 enum lnet_stats_type {
328 LNET_STATS_TYPE_SEND = 0,
329 LNET_STATS_TYPE_RECV,
333 struct lnet_comm_count {
334 atomic_t co_get_count;
335 atomic_t co_put_count;
336 atomic_t co_reply_count;
337 atomic_t co_ack_count;
338 atomic_t co_hello_count;
341 struct lnet_element_stats {
342 struct lnet_comm_count el_send_stats;
343 struct lnet_comm_count el_recv_stats;
344 struct lnet_comm_count el_drop_stats;
347 struct lnet_health_local_stats {
348 atomic_t hlt_local_interrupt;
349 atomic_t hlt_local_dropped;
350 atomic_t hlt_local_aborted;
351 atomic_t hlt_local_no_route;
352 atomic_t hlt_local_timeout;
353 atomic_t hlt_local_error;
356 struct lnet_health_remote_stats {
357 atomic_t hlt_remote_dropped;
358 atomic_t hlt_remote_timeout;
359 atomic_t hlt_remote_error;
360 atomic_t hlt_network_timeout;
364 /* chain on the ln_nets */
365 struct list_head net_list;
367 /* net ID, which is composed of
368 * (net_type << 16) | net_num.
369 * net_type can be one of the enumerated types defined in
370 * lnet/include/lnet/nidstr.h */
373 /* round robin selection */
376 /* total number of CPTs in the array */
379 /* cumulative CPTs of all NIs in this net */
382 /* relative net selection priority */
383 __u32 net_sel_priority;
385 /* network tunables */
386 struct lnet_ioctl_config_lnd_cmn_tunables net_tunables;
389 * boolean to indicate that the tunables have been set and
392 bool net_tunables_set;
394 /* procedural interface */
395 const struct lnet_lnd *net_lnd;
397 /* list of NIs on this net */
398 struct list_head net_ni_list;
400 /* list of NIs being added, but not started yet */
401 struct list_head net_ni_added;
403 /* dying LND instances */
404 struct list_head net_ni_zombie;
406 /* when I was last alive */
407 time64_t net_last_alive;
409 /* protects access to net_last_alive */
412 /* list of router nids preferred for this network */
413 struct list_head net_rtr_pref_nids;
417 /* chain on the lnet_net structure */
418 struct list_head ni_netlist;
420 /* chain on the recovery queue */
421 struct list_head ni_recovery;
423 /* MD handle for recovery ping */
424 struct lnet_handle_md ni_ping_mdh;
431 /* bond NI on some CPTs */
434 /* interface's NID */
437 /* instance-specific data */
441 atomic_t ni_tx_credits;
443 /* percpt TX queues */
444 struct lnet_tx_queue **ni_tx_queues;
446 /* percpt reference count */
449 /* pointer to parent network */
450 struct lnet_net *ni_net;
452 /* my health status */
453 struct lnet_ni_status *ni_status;
455 /* NI FSM. Protected by lnet_ni_lock() */
456 enum lnet_ni_state ni_state;
458 /* Recovery state. Protected by lnet_ni_lock() */
459 __u32 ni_recovery_state;
461 /* per NI LND tunables */
462 struct lnet_lnd_tunables ni_lnd_tunables;
464 /* lnd tunables set explicitly */
465 bool ni_lnd_tunables_set;
468 struct lnet_element_stats ni_stats;
469 struct lnet_health_local_stats ni_hstats;
471 /* physical device CPT */
474 /* sequence number used to round robin over nis within a net */
479 * initialized to LNET_MAX_HEALTH_VALUE
480 * Value is decremented every time we fail to send a message over
481 * this NI because of a NI specific failure.
482 * Value is incremented if we successfully send a message.
487 * Set to 1 by the LND when it receives an event telling it the device
488 * has gone into a fatal state. Set to 0 when the LND receives an
489 * even telling it the device is back online.
491 atomic_t ni_fatal_error_on;
493 /* the relative selection priority of this NI */
494 __u32 ni_sel_priority;
497 * equivalent interfaces to use
498 * This is an array because socklnd bonding can still be configured
500 char *ni_interfaces[LNET_INTERFACES_NUM];
501 struct net *ni_net_ns; /* original net namespace */
504 #define LNET_PROTO_PING_MATCHBITS 0x8000000000000000LL
507 * Descriptor of a ping info buffer: keep a separate indicator of the
508 * size and a reference count. The type is used both as a source and
509 * sink of data, so we need to keep some information outside of the
510 * area that may be overwritten by network data.
512 struct lnet_ping_buffer {
516 struct lnet_ping_info pb_info;
519 #define LNET_PING_BUFFER_SIZE(NNIDS) \
520 offsetof(struct lnet_ping_buffer, pb_info.pi_ni[NNIDS])
521 #define LNET_PING_BUFFER_LONI(PBUF) ((PBUF)->pb_info.pi_ni[0].ns_nid)
522 #define LNET_PING_BUFFER_SEQNO(PBUF) ((PBUF)->pb_info.pi_ni[0].ns_status)
524 #define LNET_PING_INFO_TO_BUFFER(PINFO) \
525 container_of((PINFO), struct lnet_ping_buffer, pb_info)
527 struct lnet_nid_list {
528 struct list_head nl_list;
532 struct lnet_peer_ni {
533 /* chain on lpn_peer_nis */
534 struct list_head lpni_peer_nis;
535 /* chain on remote peer list */
536 struct list_head lpni_on_remote_peer_ni_list;
537 /* chain on recovery queue */
538 struct list_head lpni_recovery;
539 /* chain on peer hash */
540 struct list_head lpni_hashlist;
541 /* messages blocking for tx credits */
542 struct list_head lpni_txq;
543 /* pointer to peer net I'm part of */
544 struct lnet_peer_net *lpni_peer_net;
545 /* statistics kept on each peer NI */
546 struct lnet_element_stats lpni_stats;
547 struct lnet_health_remote_stats lpni_hstats;
548 /* spin lock protecting credits and lpni_txq */
549 spinlock_t lpni_lock;
550 /* # tx credits available */
553 int lpni_mintxcredits;
555 * Each peer_ni in a gateway maintains its own credits. This
556 * allows more traffic to gateways that have multiple interfaces.
558 /* # router credits */
561 int lpni_minrtrcredits;
562 /* bytes queued for sending */
564 /* network peer is on */
565 struct lnet_net *lpni_net;
569 atomic_t lpni_refcount;
570 /* health value for the peer */
571 atomic_t lpni_healthv;
572 /* recovery ping mdh */
573 struct lnet_handle_md lpni_recovery_ping_mdh;
574 /* CPT this peer attached on */
576 /* state flags -- protected by lpni_lock */
578 /* status of the peer NI as reported by the peer */
579 __u32 lpni_ns_status;
580 /* sequence number used to round robin over peer nis within a net */
582 /* sequence number used to round robin over gateways */
584 /* returned RC ping features. Protected with lpni_lock */
585 unsigned int lpni_ping_feats;
586 /* time last message was received from the peer */
587 time64_t lpni_last_alive;
588 /* preferred local nids: if only one, use lpni_pref.nid */
591 struct list_head nids;
593 /* list of router nids preferred for this peer NI */
594 struct list_head lpni_rtr_pref_nids;
595 /* The relative selection priority of this peer NI */
596 __u32 lpni_sel_priority;
597 /* number of preferred NIDs in lnpi_pref_nids */
598 __u32 lpni_pref_nnids;
601 /* Preferred path added due to traffic on non-MR peer_ni */
602 #define LNET_PEER_NI_NON_MR_PREF BIT(0)
603 /* peer is being recovered. */
604 #define LNET_PEER_NI_RECOVERY_PENDING BIT(1)
605 /* recovery ping failed */
606 #define LNET_PEER_NI_RECOVERY_FAILED BIT(2)
607 /* peer is being deleted */
608 #define LNET_PEER_NI_DELETING BIT(3)
611 /* chain on pt_peer_list */
612 struct list_head lp_peer_list;
614 /* list of peer nets */
615 struct list_head lp_peer_nets;
617 /* list of messages pending discovery*/
618 struct list_head lp_dc_pendq;
620 /* chain on router list */
621 struct list_head lp_rtr_list;
623 /* primary NID of the peer */
624 lnet_nid_t lp_primary_nid;
626 /* source NID to use during discovery */
627 lnet_nid_t lp_disc_src_nid;
629 /* net to perform discovery on */
630 __u32 lp_disc_net_id;
632 /* CPT of peer_table */
635 /* number of NIDs on this peer */
638 /* # refs from lnet_route::lr_gateway */
642 * peer specific health sensitivity value to decrement peer nis in
643 * this peer with if set to something other than 0
645 __u32 lp_health_sensitivity;
647 /* messages blocking for router credits */
648 struct list_head lp_rtrq;
650 /* routes on this peer */
651 struct list_head lp_routes;
653 /* reference count */
654 atomic_t lp_refcount;
656 /* lock protecting peer state flags and lpni_rtrq */
659 /* peer state flags */
662 /* buffer for data pushed by peer */
663 struct lnet_ping_buffer *lp_data;
665 /* MD handle for ping in progress */
666 struct lnet_handle_md lp_ping_mdh;
668 /* MD handle for push in progress */
669 struct lnet_handle_md lp_push_mdh;
671 /* number of NIDs for sizing push data */
674 /* NI config sequence number of peer */
677 /* Local NI config sequence number acked by peer */
680 /* Local NI config sequence number sent to peer */
681 __u32 lp_node_seqno_sent;
683 /* Ping error encountered during discovery. */
686 /* Push error encountered during discovery. */
689 /* Error encountered during discovery. */
692 /* time it was put on the ln_dc_working queue */
693 time64_t lp_last_queued;
695 /* link on discovery-related lists */
696 struct list_head lp_dc_list;
698 /* tasks waiting on discovery of this peer */
699 wait_queue_head_t lp_dc_waitq;
701 /* cached peer aliveness */
706 * The status flags in lp_state. Their semantics have chosen so that
707 * lp_state can be zero-initialized.
709 * A peer is marked MULTI_RAIL in two cases: it was configured using DLC
710 * as multi-rail aware, or the LNET_PING_FEAT_MULTI_RAIL bit was set.
712 * A peer is marked NO_DISCOVERY if the LNET_PING_FEAT_DISCOVERY bit was
713 * NOT set when the peer was pinged by discovery.
715 * A peer is marked ROUTER if it indicates so in the feature bit.
717 #define LNET_PEER_MULTI_RAIL BIT(0) /* Multi-rail aware */
718 #define LNET_PEER_NO_DISCOVERY BIT(1) /* Peer disabled discovery */
719 #define LNET_PEER_ROUTER_ENABLED BIT(2) /* router feature enabled */
722 * A peer is marked CONFIGURED if it was configured by DLC.
724 * In addition, a peer is marked DISCOVERED if it has fully passed
725 * through Peer Discovery.
727 * When Peer Discovery is disabled, the discovery thread will mark
728 * peers REDISCOVER to indicate that they should be re-examined if
729 * discovery is (re)enabled on the node.
731 * A peer that was created as the result of inbound traffic will not
734 #define LNET_PEER_CONFIGURED BIT(3) /* Configured via DLC */
735 #define LNET_PEER_DISCOVERED BIT(4) /* Peer was discovered */
736 #define LNET_PEER_REDISCOVER BIT(5) /* Discovery was disabled */
738 * A peer is marked DISCOVERING when discovery is in progress.
739 * The other flags below correspond to stages of discovery.
741 #define LNET_PEER_DISCOVERING BIT(6) /* Discovering */
742 #define LNET_PEER_DATA_PRESENT BIT(7) /* Remote peer data present */
743 #define LNET_PEER_NIDS_UPTODATE BIT(8) /* Remote peer info uptodate */
744 #define LNET_PEER_PING_SENT BIT(9) /* Waiting for REPLY to Ping */
745 #define LNET_PEER_PUSH_SENT BIT(10) /* Waiting for ACK of Push */
746 #define LNET_PEER_PING_FAILED BIT(11) /* Ping send failure */
747 #define LNET_PEER_PUSH_FAILED BIT(12) /* Push send failure */
749 * A ping can be forced as a way to fix up state, or as a manual
750 * intervention by an admin.
751 * A push can be forced in circumstances that would normally not
752 * allow for one to happen.
754 #define LNET_PEER_FORCE_PING BIT(13) /* Forced Ping */
755 #define LNET_PEER_FORCE_PUSH BIT(14) /* Forced Push */
757 /* force delete even if router */
758 #define LNET_PEER_RTR_NI_FORCE_DEL BIT(15)
760 /* gw undergoing alive discovery */
761 #define LNET_PEER_RTR_DISCOVERY BIT(16)
762 /* gw has undergone discovery (does not indicate success or failure) */
763 #define LNET_PEER_RTR_DISCOVERED BIT(17)
765 /* peer is marked for deletion */
766 #define LNET_PEER_MARK_DELETION BIT(18)
767 /* lnet_peer_del()/lnet_peer_del_locked() has been called on the peer */
768 #define LNET_PEER_MARK_DELETED BIT(19)
770 struct lnet_peer_net {
771 /* chain on lp_peer_nets */
772 struct list_head lpn_peer_nets;
774 /* list of peer_nis on this network */
775 struct list_head lpn_peer_nis;
777 /* pointer to the peer I'm part of */
778 struct lnet_peer *lpn_peer;
783 /* peer net health */
786 /* time of last router net check attempt */
787 time64_t lpn_rtrcheck_timestamp;
789 /* selection sequence number */
792 /* relative peer net selection priority */
793 __u32 lpn_sel_priority;
795 /* reference count */
796 atomic_t lpn_refcount;
800 #define LNET_PEER_HASH_BITS 9
801 #define LNET_PEER_HASH_SIZE (1 << LNET_PEER_HASH_BITS)
804 * peer hash table - one per CPT
806 * protected by lnet_net_lock/EX for update
811 * protected by pt_zombie_lock:
815 * pt_zombie lock nests inside lnet_net_lock
817 struct lnet_peer_table {
818 int pt_version; /* /proc validity stamp */
819 struct list_head *pt_hash; /* NID->peer hash */
820 struct list_head pt_peer_list; /* peers */
821 int pt_peers; /* # peers */
822 struct list_head pt_zombie_list; /* zombie peer_ni */
823 int pt_zombies; /* # zombie peers_ni */
824 spinlock_t pt_zombie_lock; /* protect list and count */
827 /* peer aliveness is enabled only on routers for peers in a network where the
828 * struct lnet_ni::ni_peertimeout has been set to a positive value
830 #define lnet_peer_aliveness_enabled(lp) (the_lnet.ln_routing != 0 && \
831 ((lp)->lpni_net) && \
832 (lp)->lpni_net->net_tunables.lct_peer_timeout > 0)
835 struct list_head lr_list; /* chain on net */
836 struct list_head lr_gwlist; /* chain on gateway */
837 struct lnet_peer *lr_gateway; /* router node */
838 lnet_nid_t lr_nid; /* NID used to add route */
839 __u32 lr_net; /* remote network number */
840 __u32 lr_lnet; /* local network number */
841 int lr_seq; /* sequence for round-robin */
842 __u32 lr_hops; /* how far I am */
843 unsigned int lr_priority; /* route priority */
844 bool lr_alive; /* cached route aliveness */
845 bool lr_single_hop; /* this route is single-hop */
848 #define LNET_REMOTE_NETS_HASH_DEFAULT (1U << 7)
849 #define LNET_REMOTE_NETS_HASH_MAX (1U << 16)
850 #define LNET_REMOTE_NETS_HASH_SIZE (1 << the_lnet.ln_remote_nets_hbits)
852 struct lnet_remotenet {
853 /* chain on ln_remote_nets_hash */
854 struct list_head lrn_list;
856 struct list_head lrn_routes;
861 /** lnet message has credit and can be submitted to lnd for send/receive */
862 #define LNET_CREDIT_OK 0
863 /** lnet message is waiting for credit */
864 #define LNET_CREDIT_WAIT 1
865 /** lnet message is waiting for discovery */
866 #define LNET_DC_WAIT 2
868 struct lnet_rtrbufpool {
869 /* my free buffer pool */
870 struct list_head rbp_bufs;
871 /* messages blocking for a buffer */
872 struct list_head rbp_msgs;
873 /* # pages in each buffer */
875 /* requested number of buffers */
876 int rbp_req_nbuffers;
877 /* # buffers actually allocated */
879 /* # free buffers / blocked messages */
886 struct list_head rb_list; /* chain on rbp_bufs */
887 struct lnet_rtrbufpool *rb_pool; /* owning pool */
888 struct bio_vec rb_kiov[0]; /* the buffer space */
891 #define LNET_PEER_HASHSIZE 503 /* prime! */
893 enum lnet_match_flags {
894 /* Didn't match anything */
895 LNET_MATCHMD_NONE = BIT(0),
897 LNET_MATCHMD_OK = BIT(1),
898 /* Must be discarded */
899 LNET_MATCHMD_DROP = BIT(2),
900 /* match and buffer is exhausted */
901 LNET_MATCHMD_EXHAUSTED = BIT(3),
903 LNET_MATCHMD_FINISH = (LNET_MATCHMD_OK | LNET_MATCHMD_DROP),
906 /* Options for struct lnet_portal::ptl_options */
907 #define LNET_PTL_LAZY BIT(0)
908 #define LNET_PTL_MATCH_UNIQUE BIT(1) /* unique match, for RDMA */
909 #define LNET_PTL_MATCH_WILDCARD BIT(2) /* wildcard match, request portal */
911 /* parameter for matching operations (GET, PUT) */
912 struct lnet_match_info {
914 struct lnet_process_id mi_id;
917 unsigned int mi_portal;
918 unsigned int mi_rlength;
919 unsigned int mi_roffset;
922 /* ME hash of RDMA portal */
923 #define LNET_MT_HASH_BITS 8
924 #define LNET_MT_HASH_SIZE (1 << LNET_MT_HASH_BITS)
925 #define LNET_MT_HASH_MASK (LNET_MT_HASH_SIZE - 1)
926 /* we allocate (LNET_MT_HASH_SIZE + 1) entries for lnet_match_table::mt_hash,
927 * the last entry is reserved for MEs with ignore-bits */
928 #define LNET_MT_HASH_IGNORE LNET_MT_HASH_SIZE
929 /* __u64 has 2^6 bits, so need 2^(LNET_MT_HASH_BITS - LNET_MT_BITS_U64) which
930 * is 4 __u64s as bit-map, and add an extra __u64 (only use one bit) for the
931 * ME-list with ignore-bits, which is mtable::mt_hash[LNET_MT_HASH_IGNORE] */
932 #define LNET_MT_BITS_U64 6 /* 2^6 bits */
933 #define LNET_MT_EXHAUSTED_BITS (LNET_MT_HASH_BITS - LNET_MT_BITS_U64)
934 #define LNET_MT_EXHAUSTED_BMAP ((1 << LNET_MT_EXHAUSTED_BITS) + 1)
936 /* portal match table */
937 struct lnet_match_table {
938 /* reserved for upcoming patches, CPU partition ID */
940 unsigned int mt_portal; /* portal index */
941 /* match table is set as "enabled" if there's non-exhausted MD
942 * attached on mt_mhash, it's only valid for wildcard portal */
943 unsigned int mt_enabled;
944 /* bitmap to flag whether MEs on mt_hash are exhausted or not */
945 __u64 mt_exhausted[LNET_MT_EXHAUSTED_BMAP];
946 struct list_head *mt_mhash; /* matching hash */
949 /* these are only useful for wildcard portal */
950 /* Turn off message rotor for wildcard portals */
951 #define LNET_PTL_ROTOR_OFF 0
952 /* round-robin dispatch all PUT messages for wildcard portals */
953 #define LNET_PTL_ROTOR_ON 1
954 /* round-robin dispatch routed PUT message for wildcard portals */
955 #define LNET_PTL_ROTOR_RR_RT 2
956 /* dispatch routed PUT message by hashing source NID for wildcard portals */
957 #define LNET_PTL_ROTOR_HASH_RT 3
961 unsigned int ptl_index; /* portal ID, reserved */
962 /* flags on this portal: lazy, unique... */
963 unsigned int ptl_options;
964 /* list of messages which are stealing buffer */
965 struct list_head ptl_msg_stealing;
966 /* messages blocking for MD */
967 struct list_head ptl_msg_delayed;
968 /* Match table for each CPT */
969 struct lnet_match_table **ptl_mtables;
970 /* spread rotor of incoming "PUT" */
971 unsigned int ptl_rotor;
972 /* # active entries for this portal */
974 /* array of active entries' cpu-partition-id */
978 #define LNET_LH_HASH_BITS 12
979 #define LNET_LH_HASH_SIZE (1ULL << LNET_LH_HASH_BITS)
980 #define LNET_LH_HASH_MASK (LNET_LH_HASH_SIZE - 1)
982 /* resource container (ME, MD, EQ) */
983 struct lnet_res_container {
984 unsigned int rec_type; /* container type */
985 __u64 rec_lh_cookie; /* cookie generator */
986 struct list_head rec_active; /* active resource list */
987 struct list_head *rec_lh_hash; /* handle hash */
990 /* message container */
991 struct lnet_msg_container {
992 int msc_init; /* initialized or not */
993 /* max # threads finalizing */
995 /* msgs waiting to complete finalizing */
996 struct list_head msc_finalizing;
997 /* msgs waiting to be resent */
998 struct list_head msc_resending;
999 struct list_head msc_active; /* active message list */
1000 /* threads doing finalization */
1001 void **msc_finalizers;
1002 /* threads doing resends */
1003 void **msc_resenders;
1006 /* This UDSP structures need to match the user space liblnetconfig structures
1007 * in order for the marshall and unmarshall functions to be common.
1010 /* Net is described as a
1014 struct lnet_ud_net_descr {
1016 struct list_head udn_net_num_range;
1019 /* each NID range is defined as
1021 * 2. address range descriptor
1023 struct lnet_ud_nid_descr {
1024 struct lnet_ud_net_descr ud_net_id;
1025 struct list_head ud_addr_range;
1029 /* a UDSP rule can have up to three user defined NID descriptors
1030 * - src: defines the local NID range for the rule
1031 * - dst: defines the peer NID range for the rule
1032 * - rte: defines the router NID range for the rule
1034 * An action union defines the action to take when the rule
1038 struct list_head udsp_on_list;
1040 struct lnet_ud_nid_descr udsp_src;
1041 struct lnet_ud_nid_descr udsp_dst;
1042 struct lnet_ud_nid_descr udsp_rte;
1043 enum lnet_udsp_action_type udsp_action_type;
1045 __u32 udsp_priority;
1049 /* Peer Discovery states */
1050 #define LNET_DC_STATE_SHUTDOWN 0 /* not started */
1051 #define LNET_DC_STATE_RUNNING 1 /* started up OK */
1052 #define LNET_DC_STATE_STOPPING 2 /* telling thread to stop */
1054 /* Router Checker states */
1055 #define LNET_MT_STATE_SHUTDOWN 0 /* not started */
1056 #define LNET_MT_STATE_RUNNING 1 /* started up OK */
1057 #define LNET_MT_STATE_STOPPING 2 /* telling thread to stop */
1060 #define LNET_STATE_SHUTDOWN 0 /* not started */
1061 #define LNET_STATE_RUNNING 1 /* started up OK */
1062 #define LNET_STATE_STOPPING 2 /* telling thread to stop */
1065 /* CPU partition table of LNet */
1066 struct cfs_cpt_table *ln_cpt_table;
1067 /* number of CPTs in ln_cpt_table */
1068 unsigned int ln_cpt_number;
1069 unsigned int ln_cpt_bits;
1071 /* protect LNet resources (ME/MD/EQ) */
1072 struct cfs_percpt_lock *ln_res_lock;
1075 /* the vector of portals */
1076 struct lnet_portal **ln_portals;
1077 /* percpt MD container */
1078 struct lnet_res_container **ln_md_containers;
1080 /* Event Queue container */
1081 struct lnet_res_container ln_eq_container;
1082 spinlock_t ln_eq_wait_lock;
1084 unsigned int ln_remote_nets_hbits;
1086 /* protect NI, peer table, credits, routers, rtrbuf... */
1087 struct cfs_percpt_lock *ln_net_lock;
1088 /* percpt message containers for active/finalizing/freed message */
1089 struct lnet_msg_container **ln_msg_containers;
1090 struct lnet_counters **ln_counters;
1091 struct lnet_peer_table **ln_peer_tables;
1092 /* list of peer nis not on a local network */
1093 struct list_head ln_remote_peer_ni_list;
1094 /* failure simulation */
1095 struct list_head ln_test_peers;
1096 struct list_head ln_drop_rules;
1097 struct list_head ln_delay_rules;
1099 struct list_head ln_nets;
1100 /* the loopback NI */
1101 struct lnet_ni *ln_loni;
1102 /* network zombie list */
1103 struct list_head ln_net_zombie;
1104 /* resend messages list */
1105 struct list_head ln_msg_resend;
1106 /* spin lock to protect the msg resend list */
1107 spinlock_t ln_msg_resend_lock;
1109 /* remote networks with routes to them */
1110 struct list_head *ln_remote_nets_hash;
1111 /* validity stamp */
1112 __u64 ln_remote_nets_version;
1113 /* list of all known routers */
1114 struct list_head ln_routers;
1115 /* validity stamp */
1116 __u64 ln_routers_version;
1117 /* percpt router buffer pools */
1118 struct lnet_rtrbufpool **ln_rtrpools;
1121 * Ping target / Push source
1123 * The ping target and push source share a single buffer. The
1124 * ln_ping_target is protected against concurrent updates by
1127 struct lnet_handle_md ln_ping_target_md;
1128 lnet_handler_t ln_ping_target_handler;
1129 struct lnet_ping_buffer *ln_ping_target;
1130 atomic_t ln_ping_target_seqno;
1135 * ln_push_nnis contains the desired size of the push target.
1136 * The lnet_net_lock is used to handle update races. The old
1137 * buffer may linger a while after it has been unlinked, in
1138 * which case the event handler cleans up.
1140 lnet_handler_t ln_push_target_handler;
1141 struct lnet_handle_md ln_push_target_md;
1142 struct lnet_ping_buffer *ln_push_target;
1143 int ln_push_target_nnis;
1145 /* discovery event queue handle */
1146 lnet_handler_t ln_dc_handler;
1147 /* discovery requests */
1148 struct list_head ln_dc_request;
1149 /* discovery working list */
1150 struct list_head ln_dc_working;
1151 /* discovery expired list */
1152 struct list_head ln_dc_expired;
1153 /* discovery thread wait queue */
1154 wait_queue_head_t ln_dc_waitq;
1155 /* discovery startup/shutdown state */
1158 /* monitor thread startup/shutdown state */
1160 /* serialise startup/shutdown */
1161 struct semaphore ln_mt_signal;
1163 struct mutex ln_api_mutex;
1164 struct mutex ln_lnd_mutex;
1165 /* Have I called LNetNIInit myself? */
1167 /* LNetNIInit/LNetNIFini counter */
1169 /* SHUTDOWN/RUNNING/STOPPING */
1172 int ln_routing; /* am I a router? */
1173 lnet_pid_t ln_pid; /* requested pid */
1174 /* uniquely identifies this ni in this epoch */
1175 __u64 ln_interface_cookie;
1176 /* registered LNDs */
1177 const struct lnet_lnd *ln_lnds[NUM_LNDS];
1179 /* test protocol compatibility flags */
1180 unsigned long ln_testprotocompat;
1182 /* 0 - load the NIs from the mod params
1183 * 1 - do not load the NIs from the mod params
1184 * Reverse logic to ensure that other calls to LNetNIInit
1187 bool ln_nis_from_mod_params;
1190 * completion for the monitor thread. The monitor thread takes care of
1191 * checking routes, timedout messages and resending messages.
1193 struct completion ln_mt_wait_complete;
1195 /* per-cpt resend queues */
1196 struct list_head **ln_mt_resendqs;
1197 /* local NIs to recover */
1198 struct list_head ln_mt_localNIRecovq;
1199 /* local NIs to recover */
1200 struct list_head ln_mt_peerNIRecovq;
1202 * An array of queues for GET/PUT waiting for REPLY/ACK respectively.
1203 * There are CPT number of queues. Since response trackers will be
1204 * added on the fast path we can't afford to grab the exclusive
1205 * net lock to protect these queues. The CPT will be calculated
1206 * based on the mdh cookie.
1208 struct list_head **ln_mt_rstq;
1210 * A response tracker becomes a zombie when the associated MD is queued
1211 * for unlink before the response tracker is detached from the MD. An
1212 * entry on a zombie list can be freed when either the remaining
1213 * operations on the MD complete or when LNet has shut down.
1215 struct list_head **ln_mt_zombie_rstqs;
1216 /* recovery handler */
1217 lnet_handler_t ln_mt_handler;
1220 * Completed when the discovery and monitor threads can enter their
1223 struct completion ln_started;
1225 struct list_head ln_udsp_list;