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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 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/klnds/o2iblnd/o2iblnd.h
34 * Author: Eric Barton <eric@bartonsoftware.com>
37 #ifdef HAVE_COMPAT_RDMA
38 #include <linux/compat-2.6.h>
40 #ifdef LINUX_3_17_COMPAT_H
41 #undef NEED_KTIME_GET_REAL_NS
46 #include <linux/module.h>
47 #include <linux/kernel.h>
48 #include <linux/kthread.h>
50 #include <linux/string.h>
51 #include <linux/stat.h>
52 #include <linux/errno.h>
53 #include <linux/unistd.h>
54 #include <linux/uio.h>
56 #include <asm/uaccess.h>
59 #include <linux/init.h>
61 #include <linux/file.h>
62 #include <linux/stat.h>
63 #include <linux/list.h>
64 #include <linux/kmod.h>
65 #include <linux/sysctl.h>
66 #include <linux/pci.h>
71 #include <rdma/rdma_cm.h>
72 #include <rdma/ib_cm.h>
73 #include <rdma/ib_verbs.h>
74 #include <rdma/ib_fmr_pool.h>
76 #define DEBUG_SUBSYSTEM S_LND
78 #include <libcfs/libcfs.h>
79 #include <lnet/lib-lnet.h>
81 #define IBLND_PEER_HASH_SIZE 101 /* # peer_ni lists */
82 /* # scheduler loops before reschedule */
83 #define IBLND_RESCHED 100
85 #define IBLND_N_SCHED 2
86 #define IBLND_N_SCHED_HIGH 4
89 int *kib_dev_failover; /* HCA failover */
90 unsigned int *kib_service; /* IB service number */
91 int *kib_min_reconnect_interval; /* first failed connection retry... */
92 int *kib_max_reconnect_interval; /* ...exponentially increasing to this */
93 int *kib_cksum; /* checksum struct kib_msg? */
94 int *kib_timeout; /* comms timeout (seconds) */
95 int *kib_keepalive; /* keepalive timeout (seconds) */
96 int *kib_ntx; /* # tx descs */
97 char **kib_default_ipif; /* default IPoIB interface */
99 int *kib_rnr_retry_count;
100 int *kib_ib_mtu; /* IB MTU */
101 int *kib_require_priv_port;/* accept only privileged ports */
102 int *kib_use_priv_port; /* use privileged port for active connect */
103 /* # threads on each CPT */
105 int *kib_wrq_sge; /* # sg elements per wrq */
106 int *kib_use_fastreg_gaps; /* enable discontiguous fastreg fragment support */
109 extern struct kib_tunables kiblnd_tunables;
111 #define IBLND_MSG_QUEUE_SIZE_V1 8 /* V1 only : # messages/RDMAs in-flight */
112 #define IBLND_CREDIT_HIGHWATER_V1 7 /* V1 only : when eagerly to return credits */
114 #define IBLND_CREDITS_DEFAULT 8 /* default # of peer_ni credits */
115 #define IBLND_CREDITS_MAX ((typeof(((struct kib_msg *) 0)->ibm_credits)) - 1) /* Max # of peer_ni credits */
117 /* when eagerly to return credits */
118 #define IBLND_CREDITS_HIGHWATER(t, v) ((v) == IBLND_MSG_VERSION_1 ? \
119 IBLND_CREDIT_HIGHWATER_V1 : \
120 t->lnd_peercredits_hiw)
122 #ifdef HAVE_RDMA_CREATE_ID_5ARG
123 # define kiblnd_rdma_create_id(cb, dev, ps, qpt) rdma_create_id(current->nsproxy->net_ns, \
127 # ifdef HAVE_RDMA_CREATE_ID_4ARG
128 # define kiblnd_rdma_create_id(cb, dev, ps, qpt) rdma_create_id(cb, dev, \
131 # define kiblnd_rdma_create_id(cb, dev, ps, qpt) rdma_create_id(cb, dev, ps)
135 /* 2 OOB shall suffice for 1 keepalive and 1 returning credits */
136 #define IBLND_OOB_CAPABLE(v) ((v) != IBLND_MSG_VERSION_1)
137 #define IBLND_OOB_MSGS(v) (IBLND_OOB_CAPABLE(v) ? 2 : 0)
139 #define IBLND_MSG_SIZE (4<<10) /* max size of queued messages (inc hdr) */
140 #define IBLND_MAX_RDMA_FRAGS LNET_MAX_IOV /* max # of fragments supported */
142 /************************/
143 /* derived constants... */
144 /* Pools (shared by connections on each CPT) */
145 /* These pools can grow at runtime, so don't need give a very large value */
146 #define IBLND_TX_POOL 256
147 #define IBLND_FMR_POOL 256
148 #define IBLND_FMR_POOL_FLUSH 192
150 /* RX messages (per connection) */
151 #define IBLND_RX_MSGS(c) \
152 ((c->ibc_queue_depth) * 2 + IBLND_OOB_MSGS(c->ibc_version))
153 #define IBLND_RX_MSG_BYTES(c) (IBLND_RX_MSGS(c) * IBLND_MSG_SIZE)
154 #define IBLND_RX_MSG_PAGES(c) \
155 ((IBLND_RX_MSG_BYTES(c) + PAGE_SIZE - 1) / PAGE_SIZE)
157 /* WRs and CQEs (per connection) */
158 #define IBLND_RECV_WRS(c) IBLND_RX_MSGS(c)
160 /* 2 = LNet msg + Transfer chain */
161 #define IBLND_CQ_ENTRIES(c) (IBLND_RECV_WRS(c) + kiblnd_send_wrs(c))
165 /* o2iblnd can run over aliased interface */
167 #define KIB_IFNAME_SIZE IFALIASZ
169 #define KIB_IFNAME_SIZE 256
173 IBLND_DEV_CAPS_FASTREG_ENABLED = BIT(0),
174 IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT = BIT(1),
175 IBLND_DEV_CAPS_FMR_ENABLED = BIT(2),
179 struct list_head ibd_list; /* chain on kib_devs */
180 struct list_head ibd_fail_list; /* chain on kib_failed_devs */
181 __u32 ibd_ifip; /* IPoIB interface IP */
182 /** IPoIB interface name */
183 char ibd_ifname[KIB_IFNAME_SIZE];
184 int ibd_nnets; /* # nets extant */
186 time64_t ibd_next_failover;
187 /* # failover failures */
188 int ibd_failed_failover;
189 /* failover in progress */
190 unsigned int ibd_failover;
191 /* IPoIB interface is a bonding master */
192 unsigned int ibd_can_failover;
193 struct list_head ibd_nets;
194 struct kib_hca_dev *ibd_hdev;
195 enum kib_dev_caps ibd_dev_caps;
199 struct rdma_cm_id *ibh_cmid; /* listener cmid */
200 struct ib_device *ibh_ibdev; /* IB device */
201 int ibh_page_shift; /* page shift of current HCA */
202 int ibh_page_size; /* page size of current HCA */
203 __u64 ibh_page_mask; /* page mask of current HCA */
204 int ibh_mr_shift; /* bits shift of max MR size */
205 __u64 ibh_mr_size; /* size of MR */
206 #ifdef HAVE_IB_GET_DMA_MR
207 struct ib_mr *ibh_mrs; /* global MR */
209 struct ib_pd *ibh_pd; /* PD */
210 struct kib_dev *ibh_dev; /* owner */
211 atomic_t ibh_ref; /* refcount */
214 /** # of seconds to keep pool alive */
215 #define IBLND_POOL_DEADLINE 300
216 /** # of seconds to retry if allocation failed */
217 #define IBLND_POOL_RETRY 1
220 int ibp_npages; /* # pages */
221 struct page *ibp_pages[0]; /* page array */
227 typedef int (*kib_ps_pool_create_t)(struct kib_poolset *ps,
228 int inc, struct kib_pool **pp_po);
229 typedef void (*kib_ps_pool_destroy_t)(struct kib_pool *po);
230 typedef void (*kib_ps_node_init_t)(struct kib_pool *po, struct list_head *node);
231 typedef void (*kib_ps_node_fini_t)(struct kib_pool *po, struct list_head *node);
235 #define IBLND_POOL_NAME_LEN 32
240 /* network it belongs to */
241 struct kib_net *ps_net;
243 char ps_name[IBLND_POOL_NAME_LEN];
245 struct list_head ps_pool_list;
246 /* failed pool list */
247 struct list_head ps_failed_pool_list;
248 /* time stamp for retry if failed to allocate */
249 time64_t ps_next_retry;
250 /* is allocating new pool */
257 /* create a new pool */
258 kib_ps_pool_create_t ps_pool_create;
260 kib_ps_pool_destroy_t ps_pool_destroy;
261 /* initialize new allocated node */
262 kib_ps_node_init_t ps_node_init;
264 kib_ps_node_fini_t ps_node_fini;
268 /* chain on pool list */
269 struct list_head po_list;
270 /* pre-allocated node */
271 struct list_head po_free_list;
272 /* pool_set of this pool */
273 struct kib_poolset *po_owner;
274 /* deadline of this pool */
275 time64_t po_deadline;
276 /* # of elements in use */
278 /* pool is created on failed HCA */
280 /* # of pre-allocated elements */
284 struct kib_tx_poolset {
285 struct kib_poolset tps_poolset; /* pool-set */
286 __u64 tps_next_tx_cookie; /* cookie of TX */
290 struct kib_pool tpo_pool; /* pool */
291 struct kib_hca_dev *tpo_hdev; /* device for this pool */
292 struct kib_tx *tpo_tx_descs; /* all the tx descriptors */
293 struct kib_pages *tpo_tx_pages; /* premapped tx msg pages */
296 struct kib_fmr_poolset {
297 spinlock_t fps_lock; /* serialize */
298 struct kib_net *fps_net; /* IB network */
299 struct list_head fps_pool_list; /* FMR pool list */
300 struct list_head fps_failed_pool_list; /* FMR pool list */
301 __u64 fps_version; /* validity stamp */
302 int fps_cpt; /* CPT id */
304 int fps_flush_trigger;
306 /* is allocating new pool */
308 /* time stamp for retry if failed to allocate */
309 time64_t fps_next_retry;
312 #ifndef HAVE_IB_RDMA_WR
314 struct ib_send_wr wr;
318 struct kib_fast_reg_descriptor { /* For fast registration */
319 struct list_head frd_list;
320 struct ib_rdma_wr frd_inv_wr;
321 #ifdef HAVE_IB_MAP_MR_SG
322 struct ib_reg_wr frd_fastreg_wr;
324 struct ib_rdma_wr frd_fastreg_wr;
325 struct ib_fast_reg_page_list *frd_frpl;
327 struct ib_mr *frd_mr;
331 struct kib_fmr_pool {
332 struct list_head fpo_list; /* chain on pool list */
333 struct kib_hca_dev *fpo_hdev; /* device for this pool */
334 struct kib_fmr_poolset *fpo_owner; /* owner of this pool */
337 struct ib_fmr_pool *fpo_fmr_pool; /* IB FMR pool */
339 struct { /* For fast registration */
340 struct list_head fpo_pool_list;
344 time64_t fpo_deadline; /* deadline of this pool */
345 int fpo_failed; /* fmr pool is failed */
346 int fpo_map_count; /* # of mapped FMR */
347 bool fpo_is_fmr; /* True if FMR pools allocated */
351 struct kib_fmr_pool *fmr_pool; /* pool of FMR */
352 struct ib_pool_fmr *fmr_pfmr; /* IB pool fmr */
353 struct kib_fast_reg_descriptor *fmr_frd;
358 /* chain on struct kib_dev::ibd_nets */
359 struct list_head ibn_list;
360 __u64 ibn_incarnation;/* my epoch */
361 int ibn_init; /* initialisation state */
362 int ibn_shutdown; /* shutting down? */
364 atomic_t ibn_npeers; /* # peers extant */
365 atomic_t ibn_nconns; /* # connections extant */
367 struct kib_tx_poolset **ibn_tx_ps; /* tx pool-set */
368 struct kib_fmr_poolset **ibn_fmr_ps; /* fmr pool-set */
370 struct kib_dev *ibn_dev; /* underlying IB device */
373 #define KIB_THREAD_SHIFT 16
374 #define KIB_THREAD_ID(cpt, tid) ((cpt) << KIB_THREAD_SHIFT | (tid))
375 #define KIB_THREAD_CPT(id) ((id) >> KIB_THREAD_SHIFT)
376 #define KIB_THREAD_TID(id) ((id) & ((1UL << KIB_THREAD_SHIFT) - 1))
378 struct kib_sched_info {
381 /* schedulers sleep here */
382 wait_queue_head_t ibs_waitq;
383 /* conns to check for rx completions */
384 struct list_head ibs_conns;
385 /* number of scheduler threads */
387 /* max allowed scheduler threads */
388 int ibs_nthreads_max;
389 int ibs_cpt; /* CPT id */
393 int kib_init; /* initialisation state */
394 int kib_shutdown; /* shut down? */
395 struct list_head kib_devs; /* IB devices extant */
396 /* list head of failed devices */
397 struct list_head kib_failed_devs;
398 /* schedulers sleep here */
399 wait_queue_head_t kib_failover_waitq;
400 atomic_t kib_nthreads; /* # live threads */
401 /* stabilize net/dev/peer_ni/conn ops */
402 rwlock_t kib_global_lock;
403 /* hash table of all my known peers */
404 struct list_head *kib_peers;
405 /* size of kib_peers */
406 int kib_peer_hash_size;
407 /* the connd task (serialisation assertions) */
409 /* connections to setup/teardown */
410 struct list_head kib_connd_conns;
411 /* connections with zero refcount */
412 struct list_head kib_connd_zombies;
413 /* connections to reconnect */
414 struct list_head kib_reconn_list;
415 /* peers wait for reconnection */
416 struct list_head kib_reconn_wait;
418 * The second that peers are pulled out from \a kib_reconn_wait
421 time64_t kib_reconn_sec;
422 /* connection daemon sleeps here */
423 wait_queue_head_t kib_connd_waitq;
424 spinlock_t kib_connd_lock; /* serialise */
425 struct ib_qp_attr kib_error_qpa; /* QP->ERROR */
426 /* percpt data for schedulers */
427 struct kib_sched_info **kib_scheds;
430 #define IBLND_INIT_NOTHING 0
431 #define IBLND_INIT_DATA 1
432 #define IBLND_INIT_ALL 2
434 /************************************************************************
435 * IB Wire message format.
436 * These are sent in sender's byte order (i.e. receiver flips).
439 struct kib_connparams {
440 __u16 ibcp_queue_depth;
441 __u16 ibcp_max_frags;
442 __u32 ibcp_max_msg_size;
445 struct kib_immediate_msg {
446 struct lnet_hdr ibim_hdr; /* portals header */
447 char ibim_payload[0];/* piggy-backed payload */
450 struct kib_rdma_frag {
451 __u32 rf_nob; /* # bytes this frag */
452 __u64 rf_addr; /* CAVEAT EMPTOR: misaligned!! */
455 struct kib_rdma_desc {
456 __u32 rd_key; /* local/remote key */
457 __u32 rd_nfrags; /* # fragments */
458 struct kib_rdma_frag rd_frags[0]; /* buffer frags */
461 struct kib_putreq_msg {
462 struct lnet_hdr ibprm_hdr; /* portals header */
463 __u64 ibprm_cookie; /* opaque completion cookie */
466 struct kib_putack_msg {
467 __u64 ibpam_src_cookie; /* reflected completion cookie */
468 __u64 ibpam_dst_cookie; /* opaque completion cookie */
469 struct kib_rdma_desc ibpam_rd; /* sender's sink buffer */
473 struct lnet_hdr ibgm_hdr; /* portals header */
474 __u64 ibgm_cookie; /* opaque completion cookie */
475 struct kib_rdma_desc ibgm_rd; /* rdma descriptor */
478 struct kib_completion_msg {
479 __u64 ibcm_cookie; /* opaque completion cookie */
480 __s32 ibcm_status; /* < 0 failure: >= 0 length */
484 /* First 2 fields fixed FOR ALL TIME */
485 __u32 ibm_magic; /* I'm an ibnal message */
486 __u16 ibm_version; /* this is my version number */
488 __u8 ibm_type; /* msg type */
489 __u8 ibm_credits; /* returned credits */
490 __u32 ibm_nob; /* # bytes in whole message */
491 __u32 ibm_cksum; /* checksum (0 == no checksum) */
492 __u64 ibm_srcnid; /* sender's NID */
493 __u64 ibm_srcstamp; /* sender's incarnation */
494 __u64 ibm_dstnid; /* destination's NID */
495 __u64 ibm_dststamp; /* destination's incarnation */
498 struct kib_connparams connparams;
499 struct kib_immediate_msg immediate;
500 struct kib_putreq_msg putreq;
501 struct kib_putack_msg putack;
502 struct kib_get_msg get;
503 struct kib_completion_msg completion;
507 #define IBLND_MSG_MAGIC LNET_PROTO_IB_MAGIC /* unique magic */
509 #define IBLND_MSG_VERSION_1 0x11
510 #define IBLND_MSG_VERSION_2 0x12
511 #define IBLND_MSG_VERSION IBLND_MSG_VERSION_2
513 #define IBLND_MSG_CONNREQ 0xc0 /* connection request */
514 #define IBLND_MSG_CONNACK 0xc1 /* connection acknowledge */
515 #define IBLND_MSG_NOOP 0xd0 /* nothing (just credits) */
516 #define IBLND_MSG_IMMEDIATE 0xd1 /* immediate */
517 #define IBLND_MSG_PUT_REQ 0xd2 /* putreq (src->sink) */
518 #define IBLND_MSG_PUT_NAK 0xd3 /* completion (sink->src) */
519 #define IBLND_MSG_PUT_ACK 0xd4 /* putack (sink->src) */
520 #define IBLND_MSG_PUT_DONE 0xd5 /* completion (src->sink) */
521 #define IBLND_MSG_GET_REQ 0xd6 /* getreq (sink->src) */
522 #define IBLND_MSG_GET_DONE 0xd7 /* completion (src->sink: all OK) */
525 __u32 ibr_magic; /* sender's magic */
526 __u16 ibr_version; /* sender's version */
527 __u8 ibr_why; /* reject reason */
528 __u8 ibr_padding; /* padding */
529 __u64 ibr_incarnation; /* incarnation of peer_ni */
530 struct kib_connparams ibr_cp; /* connection parameters */
533 /* connection rejection reasons */
534 #define IBLND_REJECT_CONN_RACE 1 /* You lost connection race */
535 #define IBLND_REJECT_NO_RESOURCES 2 /* Out of memory/conns etc */
536 #define IBLND_REJECT_FATAL 3 /* Anything else */
538 #define IBLND_REJECT_CONN_UNCOMPAT 4 /* incompatible version peer_ni */
539 #define IBLND_REJECT_CONN_STALE 5 /* stale peer_ni */
541 /* peer_ni's rdma frags doesn't match mine */
542 #define IBLND_REJECT_RDMA_FRAGS 6
543 /* peer_ni's msg queue size doesn't match mine */
544 #define IBLND_REJECT_MSG_QUEUE_SIZE 7
545 #define IBLND_REJECT_INVALID_SRV_ID 8
547 /***********************************************************************/
549 struct kib_rx { /* receive message */
550 /* queue for attention */
551 struct list_head rx_list;
553 struct kib_conn *rx_conn;
554 /* # bytes received (-1 while posted) */
556 /* completion status */
557 enum ib_wc_status rx_status;
558 /* message buffer (host vaddr) */
559 struct kib_msg *rx_msg;
560 /* message buffer (I/O addr) */
562 /* for dma_unmap_single() */
563 DEFINE_DMA_UNMAP_ADDR(rx_msgunmap);
564 /* receive work item... */
565 struct ib_recv_wr rx_wrq;
566 /* ...and its memory */
567 struct ib_sge rx_sge;
570 #define IBLND_POSTRX_DONT_POST 0 /* don't post */
571 #define IBLND_POSTRX_NO_CREDIT 1 /* post: no credits */
572 #define IBLND_POSTRX_PEER_CREDIT 2 /* post: give peer_ni back 1 credit */
573 #define IBLND_POSTRX_RSRVD_CREDIT 3 /* post: give myself back 1 reserved credit */
575 struct kib_tx { /* transmit message */
576 /* queue on idle_txs ibc_tx_queue etc. */
577 struct list_head tx_list;
579 struct kib_tx_pool *tx_pool;
581 struct kib_conn *tx_conn;
582 /* # tx callbacks outstanding */
584 /* queued for sending */
586 /* waiting for peer_ni */
588 /* LNET completion status */
590 /* health status of the transmit */
591 enum lnet_msg_hstatus tx_hstatus;
592 /* completion deadline */
594 /* completion cookie */
596 /* lnet msgs to finalize on completion */
597 struct lnet_msg *tx_lntmsg[2];
598 /* message buffer (host vaddr) */
599 struct kib_msg *tx_msg;
600 /* message buffer (I/O addr) */
602 /* for dma_unmap_single() */
603 DEFINE_DMA_UNMAP_ADDR(tx_msgunmap);
604 /** sge for tx_msgaddr */
605 struct ib_sge tx_msgsge;
606 /* # send work items */
608 /* # used scatter/gather elements */
610 /* send work items... */
611 struct ib_rdma_wr *tx_wrq;
612 /* ...and their memory */
613 struct ib_sge *tx_sge;
614 /* rdma descriptor */
615 struct kib_rdma_desc *tx_rd;
616 /* # entries in... */
618 /* dma_map_sg descriptor */
619 struct scatterlist *tx_frags;
620 /* rdma phys page addrs */
622 /* gaps in fragments */
625 struct kib_fmr tx_fmr;
630 struct kib_connvars {
631 /* connection-in-progress variables */
632 struct kib_msg cv_msg;
636 /* scheduler information */
637 struct kib_sched_info *ibc_sched;
639 struct kib_peer_ni *ibc_peer;
641 struct kib_hca_dev *ibc_hdev;
642 /* stash on peer_ni's conn list */
643 struct list_head ibc_list;
644 /* schedule for attention */
645 struct list_head ibc_sched_list;
646 /* version of connection */
648 /* reconnect later */
649 __u16 ibc_reconnect:1;
650 /* which instance of the peer */
651 __u64 ibc_incarnation;
653 atomic_t ibc_refcount;
654 /* what's happening */
656 /* # uncompleted sends */
657 int ibc_nsends_posted;
658 /* # uncompleted NOOPs */
659 int ibc_noops_posted;
660 /* # credits I have */
662 /* # credits to return */
663 int ibc_outstanding_credits;
664 /* # ACK/DONE msg credits */
665 int ibc_reserved_credits;
666 /* set on comms error */
668 /* connections queue depth */
669 __u16 ibc_queue_depth;
670 /* connections max frags */
672 /* receive buffers owned */
673 unsigned int ibc_nrx:16;
674 /* scheduled for attention */
675 unsigned int ibc_scheduled:1;
676 /* CQ callback fired */
677 unsigned int ibc_ready:1;
678 /* time of last send */
679 ktime_t ibc_last_send;
680 /** link chain for kiblnd_check_conns only */
681 struct list_head ibc_connd_list;
682 /** rxs completed before ESTABLISHED */
683 struct list_head ibc_early_rxs;
684 /** IBLND_MSG_NOOPs for IBLND_MSG_VERSION_1 */
685 struct list_head ibc_tx_noops;
686 /* sends that need a credit */
687 struct list_head ibc_tx_queue;
688 /* sends that don't need a credit */
689 struct list_head ibc_tx_queue_nocred;
690 /* sends that need to reserve an ACK/DONE msg */
691 struct list_head ibc_tx_queue_rsrvd;
692 /* active tx awaiting completion */
693 struct list_head ibc_active_txs;
694 /* zombie tx awaiting done */
695 struct list_head ibc_zombie_txs;
699 struct kib_rx *ibc_rxs;
700 /* premapped rx msg pages */
701 struct kib_pages *ibc_rx_pages;
704 struct rdma_cm_id *ibc_cmid;
705 /* completion queue */
706 struct ib_cq *ibc_cq;
708 /* in-progress connection state */
709 struct kib_connvars *ibc_connvars;
712 #define IBLND_CONN_INIT 0 /* being initialised */
713 #define IBLND_CONN_ACTIVE_CONNECT 1 /* active sending req */
714 #define IBLND_CONN_PASSIVE_WAIT 2 /* passive waiting for rtu */
715 #define IBLND_CONN_ESTABLISHED 3 /* connection established */
716 #define IBLND_CONN_CLOSING 4 /* being closed */
717 #define IBLND_CONN_DISCONNECTED 5 /* disconnected */
720 /* stash on global peer_ni list */
721 struct list_head ibp_list;
722 /* who's on the other end(s) */
725 struct lnet_ni *ibp_ni;
726 /* all active connections */
727 struct list_head ibp_conns;
728 /* next connection to send on for round robin */
729 struct kib_conn *ibp_next_conn;
730 /* msgs waiting for a conn */
731 struct list_head ibp_tx_queue;
732 /* incarnation of peer_ni */
733 __u64 ibp_incarnation;
734 /* when (in seconds) I was last alive */
735 time64_t ibp_last_alive;
737 atomic_t ibp_refcount;
738 /* version of peer_ni */
740 /* current passive connection attempts */
741 unsigned short ibp_accepting;
742 /* current active connection attempts */
743 unsigned short ibp_connecting;
744 /* reconnect this peer_ni later */
745 unsigned char ibp_reconnecting;
746 /* counter of how many times we triggered a conn race */
747 unsigned char ibp_races;
748 /* # consecutive reconnection attempts to this peer */
749 unsigned int ibp_reconnected;
750 /* errno on closing this peer_ni */
752 /* max map_on_demand */
754 /* max_peer_credits */
755 __u16 ibp_queue_depth;
758 #ifndef HAVE_IB_INC_RKEY
760 * ib_inc_rkey - increments the key portion of the given rkey. Can be used
761 * for calculating a new rkey for type 2 memory windows.
762 * @rkey - the rkey to increment.
764 static inline u32 ib_inc_rkey(u32 rkey)
766 const u32 mask = 0x000000ff;
767 return ((rkey + 1) & mask) | (rkey & ~mask);
771 extern struct kib_data kiblnd_data;
773 extern void kiblnd_hdev_destroy(struct kib_hca_dev *hdev);
775 int kiblnd_msg_queue_size(int version, struct lnet_ni *ni);
778 kiblnd_concurrent_sends(int version, struct lnet_ni *ni)
780 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
781 int concurrent_sends;
783 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
784 concurrent_sends = tunables->lnd_concurrent_sends;
786 if (version == IBLND_MSG_VERSION_1) {
787 if (concurrent_sends > IBLND_MSG_QUEUE_SIZE_V1 * 2)
788 return IBLND_MSG_QUEUE_SIZE_V1 * 2;
790 if (concurrent_sends < IBLND_MSG_QUEUE_SIZE_V1 / 2)
791 return IBLND_MSG_QUEUE_SIZE_V1 / 2;
794 return concurrent_sends;
798 kiblnd_hdev_addref_locked(struct kib_hca_dev *hdev)
800 LASSERT(atomic_read(&hdev->ibh_ref) > 0);
801 atomic_inc(&hdev->ibh_ref);
805 kiblnd_hdev_decref(struct kib_hca_dev *hdev)
807 LASSERT(atomic_read(&hdev->ibh_ref) > 0);
808 if (atomic_dec_and_test(&hdev->ibh_ref))
809 kiblnd_hdev_destroy(hdev);
813 kiblnd_dev_can_failover(struct kib_dev *dev)
815 if (!list_empty(&dev->ibd_fail_list)) /* already scheduled */
818 if (*kiblnd_tunables.kib_dev_failover == 0) /* disabled */
821 if (*kiblnd_tunables.kib_dev_failover > 1) /* force failover */
824 return dev->ibd_can_failover;
827 #define kiblnd_conn_addref(conn) \
829 CDEBUG(D_NET, "conn[%p] (%d)++\n", \
830 (conn), atomic_read(&(conn)->ibc_refcount)); \
831 atomic_inc(&(conn)->ibc_refcount); \
834 #define kiblnd_conn_decref(conn) \
836 unsigned long flags; \
838 CDEBUG(D_NET, "conn[%p] (%d)--\n", \
839 (conn), atomic_read(&(conn)->ibc_refcount)); \
840 LASSERT_ATOMIC_POS(&(conn)->ibc_refcount); \
841 if (atomic_dec_and_test(&(conn)->ibc_refcount)) { \
842 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags); \
843 list_add_tail(&(conn)->ibc_list, \
844 &kiblnd_data.kib_connd_zombies); \
845 wake_up(&kiblnd_data.kib_connd_waitq); \
846 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);\
850 #define kiblnd_peer_addref(peer_ni) \
852 CDEBUG(D_NET, "peer_ni[%p] -> %s (%d)++\n", \
853 (peer_ni), libcfs_nid2str((peer_ni)->ibp_nid), \
854 atomic_read (&(peer_ni)->ibp_refcount)); \
855 atomic_inc(&(peer_ni)->ibp_refcount); \
858 #define kiblnd_peer_decref(peer_ni) \
860 CDEBUG(D_NET, "peer_ni[%p] -> %s (%d)--\n", \
861 (peer_ni), libcfs_nid2str((peer_ni)->ibp_nid), \
862 atomic_read (&(peer_ni)->ibp_refcount)); \
863 LASSERT_ATOMIC_POS(&(peer_ni)->ibp_refcount); \
864 if (atomic_dec_and_test(&(peer_ni)->ibp_refcount)) \
865 kiblnd_destroy_peer(peer_ni); \
869 kiblnd_peer_connecting(struct kib_peer_ni *peer_ni)
871 return peer_ni->ibp_connecting != 0 ||
872 peer_ni->ibp_reconnecting != 0 ||
873 peer_ni->ibp_accepting != 0;
877 kiblnd_peer_idle(struct kib_peer_ni *peer_ni)
879 return !kiblnd_peer_connecting(peer_ni) && list_empty(&peer_ni->ibp_conns);
882 static inline struct list_head *
883 kiblnd_nid2peerlist (lnet_nid_t nid)
886 ((unsigned int)nid) % kiblnd_data.kib_peer_hash_size;
888 return &kiblnd_data.kib_peers[hash];
892 kiblnd_peer_active(struct kib_peer_ni *peer_ni)
894 /* Am I in the peer_ni hash table? */
895 return !list_empty(&peer_ni->ibp_list);
898 static inline struct kib_conn *
899 kiblnd_get_conn_locked(struct kib_peer_ni *peer_ni)
901 struct list_head *next;
903 LASSERT(!list_empty(&peer_ni->ibp_conns));
905 /* Advance to next connection, be sure to skip the head node */
906 if (!peer_ni->ibp_next_conn ||
907 peer_ni->ibp_next_conn->ibc_list.next == &peer_ni->ibp_conns)
908 next = peer_ni->ibp_conns.next;
910 next = peer_ni->ibp_next_conn->ibc_list.next;
911 peer_ni->ibp_next_conn = list_entry(next, struct kib_conn, ibc_list);
913 return peer_ni->ibp_next_conn;
917 kiblnd_send_keepalive(struct kib_conn *conn)
919 s64 keepalive_ns = *kiblnd_tunables.kib_keepalive * NSEC_PER_SEC;
921 return (*kiblnd_tunables.kib_keepalive > 0) &&
922 ktime_after(ktime_get(),
923 ktime_add_ns(conn->ibc_last_send, keepalive_ns));
927 kiblnd_need_noop(struct kib_conn *conn)
929 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
930 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
932 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
933 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
935 if (conn->ibc_outstanding_credits <
936 IBLND_CREDITS_HIGHWATER(tunables, conn->ibc_version) &&
937 !kiblnd_send_keepalive(conn))
938 return 0; /* No need to send NOOP */
940 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
941 if (!list_empty(&conn->ibc_tx_queue_nocred))
942 return 0; /* NOOP can be piggybacked */
944 /* No tx to piggyback NOOP onto or no credit to send a tx */
945 return (list_empty(&conn->ibc_tx_queue) ||
946 conn->ibc_credits == 0);
949 if (!list_empty(&conn->ibc_tx_noops) || /* NOOP already queued */
950 !list_empty(&conn->ibc_tx_queue_nocred) || /* piggyback NOOP */
951 conn->ibc_credits == 0) /* no credit */
954 if (conn->ibc_credits == 1 && /* last credit reserved for */
955 conn->ibc_outstanding_credits == 0) /* giving back credits */
958 /* No tx to piggyback NOOP onto or no credit to send a tx */
959 return (list_empty(&conn->ibc_tx_queue) || conn->ibc_credits == 1);
963 kiblnd_abort_receives(struct kib_conn *conn)
965 ib_modify_qp(conn->ibc_cmid->qp,
966 &kiblnd_data.kib_error_qpa, IB_QP_STATE);
969 static inline const char *
970 kiblnd_queue2str(struct kib_conn *conn, struct list_head *q)
972 if (q == &conn->ibc_tx_queue)
975 if (q == &conn->ibc_tx_queue_rsrvd)
976 return "tx_queue_rsrvd";
978 if (q == &conn->ibc_tx_queue_nocred)
979 return "tx_queue_nocred";
981 if (q == &conn->ibc_active_txs)
988 /* CAVEAT EMPTOR: We rely on descriptor alignment to allow us to use the
989 * lowest bits of the work request id to stash the work item type. */
991 #define IBLND_WID_INVAL 0
992 #define IBLND_WID_TX 1
993 #define IBLND_WID_RX 2
994 #define IBLND_WID_RDMA 3
995 #define IBLND_WID_MR 4
996 #define IBLND_WID_MASK 7UL
999 kiblnd_ptr2wreqid (void *ptr, int type)
1001 unsigned long lptr = (unsigned long)ptr;
1003 LASSERT ((lptr & IBLND_WID_MASK) == 0);
1004 LASSERT ((type & ~IBLND_WID_MASK) == 0);
1005 return (__u64)(lptr | type);
1008 static inline void *
1009 kiblnd_wreqid2ptr (__u64 wreqid)
1011 return (void *)(((unsigned long)wreqid) & ~IBLND_WID_MASK);
1015 kiblnd_wreqid2type (__u64 wreqid)
1017 return (wreqid & IBLND_WID_MASK);
1021 kiblnd_set_conn_state(struct kib_conn *conn, int state)
1023 conn->ibc_state = state;
1028 kiblnd_init_msg(struct kib_msg *msg, int type, int body_nob)
1030 msg->ibm_type = type;
1031 msg->ibm_nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1035 kiblnd_rd_size(struct kib_rdma_desc *rd)
1040 for (i = size = 0; i < rd->rd_nfrags; i++)
1041 size += rd->rd_frags[i].rf_nob;
1047 kiblnd_rd_frag_addr(struct kib_rdma_desc *rd, int index)
1049 return rd->rd_frags[index].rf_addr;
1053 kiblnd_rd_frag_size(struct kib_rdma_desc *rd, int index)
1055 return rd->rd_frags[index].rf_nob;
1059 kiblnd_rd_frag_key(struct kib_rdma_desc *rd, int index)
1065 kiblnd_rd_consume_frag(struct kib_rdma_desc *rd, int index, __u32 nob)
1067 if (nob < rd->rd_frags[index].rf_nob) {
1068 rd->rd_frags[index].rf_addr += nob;
1069 rd->rd_frags[index].rf_nob -= nob;
1078 kiblnd_rd_msg_size(struct kib_rdma_desc *rd, int msgtype, int n)
1080 LASSERT (msgtype == IBLND_MSG_GET_REQ ||
1081 msgtype == IBLND_MSG_PUT_ACK);
1083 return msgtype == IBLND_MSG_GET_REQ ?
1084 offsetof(struct kib_get_msg, ibgm_rd.rd_frags[n]) :
1085 offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[n]);
1089 kiblnd_dma_mapping_error(struct ib_device *dev, u64 dma_addr)
1091 return ib_dma_mapping_error(dev, dma_addr);
1094 static inline __u64 kiblnd_dma_map_single(struct ib_device *dev,
1095 void *msg, size_t size,
1096 enum dma_data_direction direction)
1098 return ib_dma_map_single(dev, msg, size, direction);
1101 static inline void kiblnd_dma_unmap_single(struct ib_device *dev,
1102 __u64 addr, size_t size,
1103 enum dma_data_direction direction)
1105 ib_dma_unmap_single(dev, addr, size, direction);
1108 #define KIBLND_UNMAP_ADDR_SET(p, m, a) do {} while (0)
1109 #define KIBLND_UNMAP_ADDR(p, m, a) (a)
1111 static inline int kiblnd_dma_map_sg(struct ib_device *dev,
1112 struct scatterlist *sg, int nents,
1113 enum dma_data_direction direction)
1115 return ib_dma_map_sg(dev, sg, nents, direction);
1118 static inline void kiblnd_dma_unmap_sg(struct ib_device *dev,
1119 struct scatterlist *sg, int nents,
1120 enum dma_data_direction direction)
1122 ib_dma_unmap_sg(dev, sg, nents, direction);
1125 #ifndef HAVE_IB_SG_DMA_ADDRESS
1126 #include <linux/scatterlist.h>
1127 #define ib_sg_dma_address(dev, sg) sg_dma_address((dev), (sg))
1128 #define ib_sg_dma_len(dev, sg) sg_dma_len((dev), (sg))
1131 static inline __u64 kiblnd_sg_dma_address(struct ib_device *dev,
1132 struct scatterlist *sg)
1134 return ib_sg_dma_address(dev, sg);
1137 static inline unsigned int kiblnd_sg_dma_len(struct ib_device *dev,
1138 struct scatterlist *sg)
1140 return ib_sg_dma_len(dev, sg);
1143 /* XXX We use KIBLND_CONN_PARAM(e) as writable buffer, it's not strictly
1144 * right because OFED1.2 defines it as const, to use it we have to add
1145 * (void *) cast to overcome "const" */
1147 #define KIBLND_CONN_PARAM(e) ((e)->param.conn.private_data)
1148 #define KIBLND_CONN_PARAM_LEN(e) ((e)->param.conn.private_data_len)
1150 void kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs);
1151 void kiblnd_map_rx_descs(struct kib_conn *conn);
1152 void kiblnd_unmap_rx_descs(struct kib_conn *conn);
1153 void kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node);
1154 struct list_head *kiblnd_pool_alloc_node(struct kib_poolset *ps);
1156 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1157 struct kib_rdma_desc *rd, u32 nob, u64 iov,
1158 struct kib_fmr *fmr);
1159 void kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status);
1161 int kiblnd_tunables_setup(struct lnet_ni *ni);
1162 int kiblnd_tunables_init(void);
1164 int kiblnd_connd (void *arg);
1165 int kiblnd_scheduler(void *arg);
1166 int kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name);
1167 int kiblnd_failover_thread (void *arg);
1169 int kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages);
1171 int kiblnd_cm_callback(struct rdma_cm_id *cmid,
1172 struct rdma_cm_event *event);
1173 int kiblnd_translate_mtu(int value);
1175 int kiblnd_dev_failover(struct kib_dev *dev);
1176 int kiblnd_create_peer(struct lnet_ni *ni, struct kib_peer_ni **peerp,
1178 void kiblnd_destroy_peer(struct kib_peer_ni *peer);
1179 bool kiblnd_reconnect_peer(struct kib_peer_ni *peer);
1180 void kiblnd_destroy_dev(struct kib_dev *dev);
1181 void kiblnd_unlink_peer_locked(struct kib_peer_ni *peer_ni);
1182 struct kib_peer_ni *kiblnd_find_peer_locked(struct lnet_ni *ni, lnet_nid_t nid);
1183 int kiblnd_close_stale_conns_locked(struct kib_peer_ni *peer_ni,
1184 int version, u64 incarnation);
1185 int kiblnd_close_peer_conns_locked(struct kib_peer_ni *peer_ni, int why);
1187 struct kib_conn *kiblnd_create_conn(struct kib_peer_ni *peer_ni,
1188 struct rdma_cm_id *cmid,
1189 int state, int version);
1190 void kiblnd_destroy_conn(struct kib_conn *conn);
1191 void kiblnd_close_conn(struct kib_conn *conn, int error);
1192 void kiblnd_close_conn_locked(struct kib_conn *conn, int error);
1194 void kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid);
1195 void kiblnd_txlist_done(struct list_head *txlist, int status,
1196 enum lnet_msg_hstatus hstatus);
1198 void kiblnd_qp_event(struct ib_event *event, void *arg);
1199 void kiblnd_cq_event(struct ib_event *event, void *arg);
1200 void kiblnd_cq_completion(struct ib_cq *cq, void *arg);
1202 void kiblnd_pack_msg(struct lnet_ni *ni, struct kib_msg *msg, int version,
1203 int credits, lnet_nid_t dstnid, __u64 dststamp);
1204 int kiblnd_unpack_msg(struct kib_msg *msg, int nob);
1205 int kiblnd_post_rx(struct kib_rx *rx, int credit);
1207 int kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg);
1208 int kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1209 int delayed, unsigned int niov, struct kvec *iov,
1210 lnet_kiov_t *kiov, unsigned int offset, unsigned int mlen,