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Merge tag 'tegra-for-4.3-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-eoan-kernel.git] / drivers / staging / lustre / lnet / klnds / o2iblnd / o2iblnd.h
1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lnet/klnds/o2iblnd/o2iblnd.h
37 *
38 * Author: Eric Barton <eric@bartonsoftware.com>
39 */
40
41 #include <linux/module.h>
42 #include <linux/kernel.h>
43 #include <linux/mm.h>
44 #include <linux/string.h>
45 #include <linux/stat.h>
46 #include <linux/errno.h>
47 #include <linux/unistd.h>
48 #include <linux/uio.h>
49 #include <linux/uaccess.h>
50
51 #include <asm/io.h>
52
53 #include <linux/fs.h>
54 #include <linux/file.h>
55 #include <linux/list.h>
56 #include <linux/kmod.h>
57 #include <linux/sysctl.h>
58 #include <linux/pci.h>
59
60 #include <net/sock.h>
61 #include <linux/in.h>
62
63 #define DEBUG_SUBSYSTEM S_LND
64
65 #include "../../../include/linux/libcfs/libcfs.h"
66 #include "../../../include/linux/lnet/lnet.h"
67 #include "../../../include/linux/lnet/lib-lnet.h"
68
69 #include <rdma/rdma_cm.h>
70 #include <rdma/ib_cm.h>
71 #include <rdma/ib_verbs.h>
72 #include <rdma/ib_fmr_pool.h>
73
74 #define IBLND_PEER_HASH_SIZE 101 /* # peer lists */
75 /* # scheduler loops before reschedule */
76 #define IBLND_RESCHED 100
77
78 #define IBLND_N_SCHED 2
79 #define IBLND_N_SCHED_HIGH 4
80
81 typedef struct {
82 int *kib_dev_failover; /* HCA failover */
83 unsigned int *kib_service; /* IB service number */
84 int *kib_min_reconnect_interval; /* first failed connection
85 * retry... */
86 int *kib_max_reconnect_interval; /* ...exponentially increasing
87 * to this */
88 int *kib_cksum; /* checksum kib_msg_t? */
89 int *kib_timeout; /* comms timeout (seconds) */
90 int *kib_keepalive; /* keepalive timeout (seconds) */
91 int *kib_ntx; /* # tx descs */
92 int *kib_credits; /* # concurrent sends */
93 int *kib_peertxcredits; /* # concurrent sends to 1 peer */
94 int *kib_peerrtrcredits; /* # per-peer router buffer
95 * credits */
96 int *kib_peercredits_hiw; /* # when eagerly to return
97 * credits */
98 int *kib_peertimeout; /* seconds to consider peer dead */
99 char **kib_default_ipif; /* default IPoIB interface */
100 int *kib_retry_count;
101 int *kib_rnr_retry_count;
102 int *kib_concurrent_sends; /* send work queue sizing */
103 int *kib_ib_mtu; /* IB MTU */
104 int *kib_map_on_demand; /* map-on-demand if RD has more
105 * fragments than this value, 0
106 * disable map-on-demand */
107 int *kib_pmr_pool_size; /* # physical MR in pool */
108 int *kib_fmr_pool_size; /* # FMRs in pool */
109 int *kib_fmr_flush_trigger; /* When to trigger FMR flush */
110 int *kib_fmr_cache; /* enable FMR pool cache? */
111 int *kib_require_priv_port; /* accept only privileged ports */
112 int *kib_use_priv_port; /* use privileged port for active
113 * connect */
114 int *kib_nscheds; /* # threads on each CPT */
115 } kib_tunables_t;
116
117 extern kib_tunables_t kiblnd_tunables;
118
119 #define IBLND_MSG_QUEUE_SIZE_V1 8 /* V1 only : # messages/RDMAs in-flight */
120 #define IBLND_CREDIT_HIGHWATER_V1 7 /* V1 only : when eagerly to return credits */
121
122 #define IBLND_CREDITS_DEFAULT 8 /* default # of peer credits */
123 #define IBLND_CREDITS_MAX ((typeof(((kib_msg_t*) 0)->ibm_credits)) - 1) /* Max # of peer credits */
124
125 #define IBLND_MSG_QUEUE_SIZE(v) ((v) == IBLND_MSG_VERSION_1 ? \
126 IBLND_MSG_QUEUE_SIZE_V1 : \
127 *kiblnd_tunables.kib_peertxcredits) /* # messages/RDMAs in-flight */
128 #define IBLND_CREDITS_HIGHWATER(v) ((v) == IBLND_MSG_VERSION_1 ? \
129 IBLND_CREDIT_HIGHWATER_V1 : \
130 *kiblnd_tunables.kib_peercredits_hiw) /* when eagerly to return credits */
131
132 #define kiblnd_rdma_create_id(cb, dev, ps, qpt) rdma_create_id(cb, dev, ps, qpt)
133
134 static inline int
135 kiblnd_concurrent_sends_v1(void)
136 {
137 if (*kiblnd_tunables.kib_concurrent_sends > IBLND_MSG_QUEUE_SIZE_V1 * 2)
138 return IBLND_MSG_QUEUE_SIZE_V1 * 2;
139
140 if (*kiblnd_tunables.kib_concurrent_sends < IBLND_MSG_QUEUE_SIZE_V1 / 2)
141 return IBLND_MSG_QUEUE_SIZE_V1 / 2;
142
143 return *kiblnd_tunables.kib_concurrent_sends;
144 }
145
146 #define IBLND_CONCURRENT_SENDS(v) ((v) == IBLND_MSG_VERSION_1 ? \
147 kiblnd_concurrent_sends_v1() : \
148 *kiblnd_tunables.kib_concurrent_sends)
149 /* 2 OOB shall suffice for 1 keepalive and 1 returning credits */
150 #define IBLND_OOB_CAPABLE(v) ((v) != IBLND_MSG_VERSION_1)
151 #define IBLND_OOB_MSGS(v) (IBLND_OOB_CAPABLE(v) ? 2 : 0)
152
153 #define IBLND_MSG_SIZE (4<<10) /* max size of queued messages (inc hdr) */
154 #define IBLND_MAX_RDMA_FRAGS LNET_MAX_IOV /* max # of fragments supported */
155 #define IBLND_CFG_RDMA_FRAGS (*kiblnd_tunables.kib_map_on_demand != 0 ? \
156 *kiblnd_tunables.kib_map_on_demand : \
157 IBLND_MAX_RDMA_FRAGS) /* max # of fragments configured by user */
158 #define IBLND_RDMA_FRAGS(v) ((v) == IBLND_MSG_VERSION_1 ? \
159 IBLND_MAX_RDMA_FRAGS : IBLND_CFG_RDMA_FRAGS)
160
161 /************************/
162 /* derived constants... */
163 /* Pools (shared by connections on each CPT) */
164 /* These pools can grow at runtime, so don't need give a very large value */
165 #define IBLND_TX_POOL 256
166 #define IBLND_PMR_POOL 256
167 #define IBLND_FMR_POOL 256
168 #define IBLND_FMR_POOL_FLUSH 192
169
170 /* TX messages (shared by all connections) */
171 #define IBLND_TX_MSGS() (*kiblnd_tunables.kib_ntx)
172
173 /* RX messages (per connection) */
174 #define IBLND_RX_MSGS(v) (IBLND_MSG_QUEUE_SIZE(v) * 2 + IBLND_OOB_MSGS(v))
175 #define IBLND_RX_MSG_BYTES(v) (IBLND_RX_MSGS(v) * IBLND_MSG_SIZE)
176 #define IBLND_RX_MSG_PAGES(v) ((IBLND_RX_MSG_BYTES(v) + PAGE_SIZE - 1) / PAGE_SIZE)
177
178 /* WRs and CQEs (per connection) */
179 #define IBLND_RECV_WRS(v) IBLND_RX_MSGS(v)
180 #define IBLND_SEND_WRS(v) ((IBLND_RDMA_FRAGS(v) + 1) * IBLND_CONCURRENT_SENDS(v))
181 #define IBLND_CQ_ENTRIES(v) (IBLND_RECV_WRS(v) + IBLND_SEND_WRS(v))
182
183 struct kib_hca_dev;
184
185 /* o2iblnd can run over aliased interface */
186 #ifdef IFALIASZ
187 #define KIB_IFNAME_SIZE IFALIASZ
188 #else
189 #define KIB_IFNAME_SIZE 256
190 #endif
191
192 typedef struct {
193 struct list_head ibd_list; /* chain on kib_devs */
194 struct list_head ibd_fail_list; /* chain on kib_failed_devs */
195 __u32 ibd_ifip; /* IPoIB interface IP */
196
197 /* IPoIB interface name */
198 char ibd_ifname[KIB_IFNAME_SIZE];
199 int ibd_nnets; /* # nets extant */
200
201 unsigned long ibd_next_failover;
202 int ibd_failed_failover; /* # failover failures */
203 unsigned int ibd_failover; /* failover in progress */
204 unsigned int ibd_can_failover; /* IPoIB interface is a bonding
205 * master */
206 struct list_head ibd_nets;
207 struct kib_hca_dev *ibd_hdev;
208 } kib_dev_t;
209
210 typedef struct kib_hca_dev {
211 struct rdma_cm_id *ibh_cmid; /* listener cmid */
212 struct ib_device *ibh_ibdev; /* IB device */
213 int ibh_page_shift; /* page shift of current HCA */
214 int ibh_page_size; /* page size of current HCA */
215 __u64 ibh_page_mask; /* page mask of current HCA */
216 int ibh_mr_shift; /* bits shift of max MR size */
217 __u64 ibh_mr_size; /* size of MR */
218 int ibh_nmrs; /* # of global MRs */
219 struct ib_mr **ibh_mrs; /* global MR */
220 struct ib_pd *ibh_pd; /* PD */
221 kib_dev_t *ibh_dev; /* owner */
222 atomic_t ibh_ref; /* refcount */
223 } kib_hca_dev_t;
224
225 /** # of seconds to keep pool alive */
226 #define IBLND_POOL_DEADLINE 300
227 /** # of seconds to retry if allocation failed */
228 #define IBLND_POOL_RETRY 1
229
230 typedef struct {
231 int ibp_npages; /* # pages */
232 struct page *ibp_pages[0]; /* page array */
233 } kib_pages_t;
234
235 struct kib_pmr_pool;
236
237 typedef struct {
238 struct list_head pmr_list; /* chain node */
239 struct ib_phys_buf *pmr_ipb; /* physical buffer */
240 struct ib_mr *pmr_mr; /* IB MR */
241 struct kib_pmr_pool *pmr_pool; /* owner of this MR */
242 __u64 pmr_iova; /* Virtual I/O address */
243 int pmr_refcount; /* reference count */
244 } kib_phys_mr_t;
245
246 struct kib_pool;
247 struct kib_poolset;
248
249 typedef int (*kib_ps_pool_create_t)(struct kib_poolset *ps,
250 int inc, struct kib_pool **pp_po);
251 typedef void (*kib_ps_pool_destroy_t)(struct kib_pool *po);
252 typedef void (*kib_ps_node_init_t)(struct kib_pool *po, struct list_head *node);
253 typedef void (*kib_ps_node_fini_t)(struct kib_pool *po, struct list_head *node);
254
255 struct kib_net;
256
257 #define IBLND_POOL_NAME_LEN 32
258
259 typedef struct kib_poolset {
260 spinlock_t ps_lock; /* serialize */
261 struct kib_net *ps_net; /* network it belongs to */
262 char ps_name[IBLND_POOL_NAME_LEN]; /* pool set name */
263 struct list_head ps_pool_list; /* list of pools */
264 struct list_head ps_failed_pool_list;/* failed pool list */
265 unsigned long ps_next_retry; /* time stamp for retry if
266 * failed to allocate */
267 int ps_increasing; /* is allocating new pool */
268 int ps_pool_size; /* new pool size */
269 int ps_cpt; /* CPT id */
270
271 kib_ps_pool_create_t ps_pool_create; /* create a new pool */
272 kib_ps_pool_destroy_t ps_pool_destroy; /* destroy a pool */
273 kib_ps_node_init_t ps_node_init; /* initialize new allocated
274 * node */
275 kib_ps_node_fini_t ps_node_fini; /* finalize node */
276 } kib_poolset_t;
277
278 typedef struct kib_pool {
279 struct list_head po_list; /* chain on pool list */
280 struct list_head po_free_list; /* pre-allocated node */
281 kib_poolset_t *po_owner; /* pool_set of this pool */
282 unsigned long po_deadline; /* deadline of this pool */
283 int po_allocated; /* # of elements in use */
284 int po_failed; /* pool is created on failed
285 * HCA */
286 int po_size; /* # of pre-allocated elements */
287 } kib_pool_t;
288
289 typedef struct {
290 kib_poolset_t tps_poolset; /* pool-set */
291 __u64 tps_next_tx_cookie; /* cookie of TX */
292 } kib_tx_poolset_t;
293
294 typedef struct {
295 kib_pool_t tpo_pool; /* pool */
296 struct kib_hca_dev *tpo_hdev; /* device for this pool */
297 struct kib_tx *tpo_tx_descs; /* all the tx descriptors */
298 kib_pages_t *tpo_tx_pages; /* premapped tx msg pages */
299 } kib_tx_pool_t;
300
301 typedef struct {
302 kib_poolset_t pps_poolset; /* pool-set */
303 } kib_pmr_poolset_t;
304
305 typedef struct kib_pmr_pool {
306 struct kib_hca_dev *ppo_hdev; /* device for this pool */
307 kib_pool_t ppo_pool; /* pool */
308 } kib_pmr_pool_t;
309
310 typedef struct {
311 spinlock_t fps_lock; /* serialize */
312 struct kib_net *fps_net; /* IB network */
313 struct list_head fps_pool_list; /* FMR pool list */
314 struct list_head fps_failed_pool_list;/* FMR pool list */
315 __u64 fps_version; /* validity stamp */
316 int fps_cpt; /* CPT id */
317 int fps_pool_size;
318 int fps_flush_trigger;
319 int fps_increasing; /* is allocating new pool */
320 unsigned long fps_next_retry; /* time stamp for retry if
321 * failed to allocate */
322 } kib_fmr_poolset_t;
323
324 typedef struct {
325 struct list_head fpo_list; /* chain on pool list */
326 struct kib_hca_dev *fpo_hdev; /* device for this pool */
327 kib_fmr_poolset_t *fpo_owner; /* owner of this pool */
328 struct ib_fmr_pool *fpo_fmr_pool; /* IB FMR pool */
329 unsigned long fpo_deadline; /* deadline of this pool */
330 int fpo_failed; /* fmr pool is failed */
331 int fpo_map_count; /* # of mapped FMR */
332 } kib_fmr_pool_t;
333
334 typedef struct {
335 struct ib_pool_fmr *fmr_pfmr; /* IB pool fmr */
336 kib_fmr_pool_t *fmr_pool; /* pool of FMR */
337 } kib_fmr_t;
338
339 typedef struct kib_net {
340 struct list_head ibn_list; /* chain on kib_dev_t::ibd_nets */
341 __u64 ibn_incarnation;/* my epoch */
342 int ibn_init; /* initialisation state */
343 int ibn_shutdown; /* shutting down? */
344
345 atomic_t ibn_npeers; /* # peers extant */
346 atomic_t ibn_nconns; /* # connections extant */
347
348 kib_tx_poolset_t **ibn_tx_ps; /* tx pool-set */
349 kib_fmr_poolset_t **ibn_fmr_ps; /* fmr pool-set */
350 kib_pmr_poolset_t **ibn_pmr_ps; /* pmr pool-set */
351
352 kib_dev_t *ibn_dev; /* underlying IB device */
353 } kib_net_t;
354
355 #define KIB_THREAD_SHIFT 16
356 #define KIB_THREAD_ID(cpt, tid) ((cpt) << KIB_THREAD_SHIFT | (tid))
357 #define KIB_THREAD_CPT(id) ((id) >> KIB_THREAD_SHIFT)
358 #define KIB_THREAD_TID(id) ((id) & ((1UL << KIB_THREAD_SHIFT) - 1))
359
360 struct kib_sched_info {
361 spinlock_t ibs_lock; /* serialise */
362 wait_queue_head_t ibs_waitq; /* schedulers sleep here */
363 struct list_head ibs_conns; /* conns to check for rx completions */
364 int ibs_nthreads; /* number of scheduler threads */
365 int ibs_nthreads_max; /* max allowed scheduler threads */
366 int ibs_cpt; /* CPT id */
367 };
368
369 typedef struct {
370 int kib_init; /* initialisation state */
371 int kib_shutdown; /* shut down? */
372 struct list_head kib_devs; /* IB devices extant */
373 struct list_head kib_failed_devs; /* list head of failed
374 * devices */
375 wait_queue_head_t kib_failover_waitq; /* schedulers sleep here */
376 atomic_t kib_nthreads; /* # live threads */
377 rwlock_t kib_global_lock; /* stabilize net/dev/peer/conn
378 * ops */
379 struct list_head *kib_peers; /* hash table of all my known
380 * peers */
381 int kib_peer_hash_size; /* size of kib_peers */
382 void *kib_connd; /* the connd task
383 * (serialisation assertions)
384 */
385 struct list_head kib_connd_conns; /* connections to
386 * setup/teardown */
387 struct list_head kib_connd_zombies; /* connections with zero
388 * refcount */
389 wait_queue_head_t kib_connd_waitq; /* connection daemon sleeps
390 * here */
391 spinlock_t kib_connd_lock; /* serialise */
392 struct ib_qp_attr kib_error_qpa; /* QP->ERROR */
393 struct kib_sched_info **kib_scheds; /* percpt data for schedulers
394 */
395 } kib_data_t;
396
397 #define IBLND_INIT_NOTHING 0
398 #define IBLND_INIT_DATA 1
399 #define IBLND_INIT_ALL 2
400
401 /************************************************************************
402 * IB Wire message format.
403 * These are sent in sender's byte order (i.e. receiver flips).
404 */
405
406 typedef struct kib_connparams {
407 __u16 ibcp_queue_depth;
408 __u16 ibcp_max_frags;
409 __u32 ibcp_max_msg_size;
410 } WIRE_ATTR kib_connparams_t;
411
412 typedef struct {
413 lnet_hdr_t ibim_hdr; /* portals header */
414 char ibim_payload[0]; /* piggy-backed payload */
415 } WIRE_ATTR kib_immediate_msg_t;
416
417 typedef struct {
418 __u32 rf_nob; /* # bytes this frag */
419 __u64 rf_addr; /* CAVEAT EMPTOR: misaligned!! */
420 } WIRE_ATTR kib_rdma_frag_t;
421
422 typedef struct {
423 __u32 rd_key; /* local/remote key */
424 __u32 rd_nfrags; /* # fragments */
425 kib_rdma_frag_t rd_frags[0]; /* buffer frags */
426 } WIRE_ATTR kib_rdma_desc_t;
427
428 typedef struct {
429 lnet_hdr_t ibprm_hdr; /* portals header */
430 __u64 ibprm_cookie; /* opaque completion cookie */
431 } WIRE_ATTR kib_putreq_msg_t;
432
433 typedef struct {
434 __u64 ibpam_src_cookie; /* reflected completion cookie */
435 __u64 ibpam_dst_cookie; /* opaque completion cookie */
436 kib_rdma_desc_t ibpam_rd; /* sender's sink buffer */
437 } WIRE_ATTR kib_putack_msg_t;
438
439 typedef struct {
440 lnet_hdr_t ibgm_hdr; /* portals header */
441 __u64 ibgm_cookie; /* opaque completion cookie */
442 kib_rdma_desc_t ibgm_rd; /* rdma descriptor */
443 } WIRE_ATTR kib_get_msg_t;
444
445 typedef struct {
446 __u64 ibcm_cookie; /* opaque completion cookie */
447 __s32 ibcm_status; /* < 0 failure: >= 0 length */
448 } WIRE_ATTR kib_completion_msg_t;
449
450 typedef struct {
451 /* First 2 fields fixed FOR ALL TIME */
452 __u32 ibm_magic; /* I'm an ibnal message */
453 __u16 ibm_version; /* this is my version number */
454
455 __u8 ibm_type; /* msg type */
456 __u8 ibm_credits; /* returned credits */
457 __u32 ibm_nob; /* # bytes in whole message */
458 __u32 ibm_cksum; /* checksum (0 == no checksum) */
459 __u64 ibm_srcnid; /* sender's NID */
460 __u64 ibm_srcstamp; /* sender's incarnation */
461 __u64 ibm_dstnid; /* destination's NID */
462 __u64 ibm_dststamp; /* destination's incarnation */
463
464 union {
465 kib_connparams_t connparams;
466 kib_immediate_msg_t immediate;
467 kib_putreq_msg_t putreq;
468 kib_putack_msg_t putack;
469 kib_get_msg_t get;
470 kib_completion_msg_t completion;
471 } WIRE_ATTR ibm_u;
472 } WIRE_ATTR kib_msg_t;
473
474 #define IBLND_MSG_MAGIC LNET_PROTO_IB_MAGIC /* unique magic */
475
476 #define IBLND_MSG_VERSION_1 0x11
477 #define IBLND_MSG_VERSION_2 0x12
478 #define IBLND_MSG_VERSION IBLND_MSG_VERSION_2
479
480 #define IBLND_MSG_CONNREQ 0xc0 /* connection request */
481 #define IBLND_MSG_CONNACK 0xc1 /* connection acknowledge */
482 #define IBLND_MSG_NOOP 0xd0 /* nothing (just credits) */
483 #define IBLND_MSG_IMMEDIATE 0xd1 /* immediate */
484 #define IBLND_MSG_PUT_REQ 0xd2 /* putreq (src->sink) */
485 #define IBLND_MSG_PUT_NAK 0xd3 /* completion (sink->src) */
486 #define IBLND_MSG_PUT_ACK 0xd4 /* putack (sink->src) */
487 #define IBLND_MSG_PUT_DONE 0xd5 /* completion (src->sink) */
488 #define IBLND_MSG_GET_REQ 0xd6 /* getreq (sink->src) */
489 #define IBLND_MSG_GET_DONE 0xd7 /* completion (src->sink: all OK) */
490
491 typedef struct {
492 __u32 ibr_magic; /* sender's magic */
493 __u16 ibr_version; /* sender's version */
494 __u8 ibr_why; /* reject reason */
495 __u8 ibr_padding; /* padding */
496 __u64 ibr_incarnation; /* incarnation of peer */
497 kib_connparams_t ibr_cp; /* connection parameters */
498 } WIRE_ATTR kib_rej_t;
499
500 /* connection rejection reasons */
501 #define IBLND_REJECT_CONN_RACE 1 /* You lost connection race */
502 #define IBLND_REJECT_NO_RESOURCES 2 /* Out of memory/conns etc */
503 #define IBLND_REJECT_FATAL 3 /* Anything else */
504 #define IBLND_REJECT_CONN_UNCOMPAT 4 /* incompatible version peer */
505 #define IBLND_REJECT_CONN_STALE 5 /* stale peer */
506 #define IBLND_REJECT_RDMA_FRAGS 6 /* Fatal: peer's rdma frags can't match
507 * mine */
508 #define IBLND_REJECT_MSG_QUEUE_SIZE 7 /* Fatal: peer's msg queue size can't
509 * match mine */
510
511 /***********************************************************************/
512
513 typedef struct kib_rx /* receive message */
514 {
515 struct list_head rx_list; /* queue for attention */
516 struct kib_conn *rx_conn; /* owning conn */
517 int rx_nob; /* # bytes received (-1 while
518 * posted) */
519 enum ib_wc_status rx_status; /* completion status */
520 kib_msg_t *rx_msg; /* message buffer (host vaddr) */
521 __u64 rx_msgaddr; /* message buffer (I/O addr) */
522 DECLARE_PCI_UNMAP_ADDR (rx_msgunmap); /* for dma_unmap_single() */
523 struct ib_recv_wr rx_wrq; /* receive work item... */
524 struct ib_sge rx_sge; /* ...and its memory */
525 } kib_rx_t;
526
527 #define IBLND_POSTRX_DONT_POST 0 /* don't post */
528 #define IBLND_POSTRX_NO_CREDIT 1 /* post: no credits */
529 #define IBLND_POSTRX_PEER_CREDIT 2 /* post: give peer back 1 credit */
530 #define IBLND_POSTRX_RSRVD_CREDIT 3 /* post: give myself back 1 reserved
531 * credit */
532
533 typedef struct kib_tx /* transmit message */
534 {
535 struct list_head tx_list; /* queue on idle_txs ibc_tx_queue
536 * etc. */
537 kib_tx_pool_t *tx_pool; /* pool I'm from */
538 struct kib_conn *tx_conn; /* owning conn */
539 short tx_sending; /* # tx callbacks outstanding */
540 short tx_queued; /* queued for sending */
541 short tx_waiting; /* waiting for peer */
542 int tx_status; /* LNET completion status */
543 unsigned long tx_deadline; /* completion deadline */
544 __u64 tx_cookie; /* completion cookie */
545 lnet_msg_t *tx_lntmsg[2]; /* lnet msgs to finalize on
546 * completion */
547 kib_msg_t *tx_msg; /* message buffer (host vaddr) */
548 __u64 tx_msgaddr; /* message buffer (I/O addr) */
549 DECLARE_PCI_UNMAP_ADDR (tx_msgunmap); /* for dma_unmap_single() */
550 int tx_nwrq; /* # send work items */
551 struct ib_send_wr *tx_wrq; /* send work items... */
552 struct ib_sge *tx_sge; /* ...and their memory */
553 kib_rdma_desc_t *tx_rd; /* rdma descriptor */
554 int tx_nfrags; /* # entries in... */
555 struct scatterlist *tx_frags; /* dma_map_sg descriptor */
556 __u64 *tx_pages; /* rdma phys page addrs */
557 union {
558 kib_phys_mr_t *pmr; /* MR for physical buffer */
559 kib_fmr_t fmr; /* FMR */
560 } tx_u;
561 int tx_dmadir; /* dma direction */
562 } kib_tx_t;
563
564 typedef struct kib_connvars {
565 kib_msg_t cv_msg; /* connection-in-progress variables */
566 } kib_connvars_t;
567
568 typedef struct kib_conn {
569 struct kib_sched_info *ibc_sched; /* scheduler information */
570 struct kib_peer *ibc_peer; /* owning peer */
571 kib_hca_dev_t *ibc_hdev; /* HCA bound on */
572 struct list_head ibc_list; /* stash on peer's conn
573 * list */
574 struct list_head ibc_sched_list; /* schedule for attention */
575 __u16 ibc_version; /* version of connection */
576 __u64 ibc_incarnation; /* which instance of the
577 * peer */
578 atomic_t ibc_refcount; /* # users */
579 int ibc_state; /* what's happening */
580 int ibc_nsends_posted; /* # uncompleted sends */
581 int ibc_noops_posted; /* # uncompleted NOOPs */
582 int ibc_credits; /* # credits I have */
583 int ibc_outstanding_credits; /* # credits to return */
584 int ibc_reserved_credits; /* # ACK/DONE msg credits */
585 int ibc_comms_error; /* set on comms error */
586 unsigned int ibc_nrx:16; /* receive buffers owned */
587 unsigned int ibc_scheduled:1; /* scheduled for attention
588 */
589 unsigned int ibc_ready:1; /* CQ callback fired */
590 unsigned long ibc_last_send; /* time of last send */
591 struct list_head ibc_connd_list; /* link chain for
592 * kiblnd_check_conns only
593 */
594 struct list_head ibc_early_rxs; /* rxs completed before
595 * ESTABLISHED */
596 struct list_head ibc_tx_noops; /* IBLND_MSG_NOOPs for
597 * IBLND_MSG_VERSION_1 */
598 struct list_head ibc_tx_queue; /* sends that need a credit
599 */
600 struct list_head ibc_tx_queue_nocred; /* sends that don't need a
601 * credit */
602 struct list_head ibc_tx_queue_rsrvd; /* sends that need to
603 * reserve an ACK/DONE msg
604 */
605 struct list_head ibc_active_txs; /* active tx awaiting
606 * completion */
607 spinlock_t ibc_lock; /* serialise */
608 kib_rx_t *ibc_rxs; /* the rx descs */
609 kib_pages_t *ibc_rx_pages; /* premapped rx msg pages */
610
611 struct rdma_cm_id *ibc_cmid; /* CM id */
612 struct ib_cq *ibc_cq; /* completion queue */
613
614 kib_connvars_t *ibc_connvars; /* in-progress connection
615 * state */
616 } kib_conn_t;
617
618 #define IBLND_CONN_INIT 0 /* being initialised */
619 #define IBLND_CONN_ACTIVE_CONNECT 1 /* active sending req */
620 #define IBLND_CONN_PASSIVE_WAIT 2 /* passive waiting for rtu */
621 #define IBLND_CONN_ESTABLISHED 3 /* connection established */
622 #define IBLND_CONN_CLOSING 4 /* being closed */
623 #define IBLND_CONN_DISCONNECTED 5 /* disconnected */
624
625 typedef struct kib_peer {
626 struct list_head ibp_list; /* stash on global peer list */
627 lnet_nid_t ibp_nid; /* who's on the other end(s) */
628 lnet_ni_t *ibp_ni; /* LNet interface */
629 atomic_t ibp_refcount; /* # users */
630 struct list_head ibp_conns; /* all active connections */
631 struct list_head ibp_tx_queue; /* msgs waiting for a conn */
632 __u16 ibp_version; /* version of peer */
633 __u64 ibp_incarnation; /* incarnation of peer */
634 int ibp_connecting; /* current active connection attempts
635 */
636 int ibp_accepting; /* current passive connection attempts
637 */
638 int ibp_error; /* errno on closing this peer */
639 unsigned long ibp_last_alive; /* when (in jiffies) I was last alive
640 */
641 } kib_peer_t;
642
643 extern kib_data_t kiblnd_data;
644
645 extern void kiblnd_hdev_destroy(kib_hca_dev_t *hdev);
646
647 static inline void
648 kiblnd_hdev_addref_locked(kib_hca_dev_t *hdev)
649 {
650 LASSERT (atomic_read(&hdev->ibh_ref) > 0);
651 atomic_inc(&hdev->ibh_ref);
652 }
653
654 static inline void
655 kiblnd_hdev_decref(kib_hca_dev_t *hdev)
656 {
657 LASSERT (atomic_read(&hdev->ibh_ref) > 0);
658 if (atomic_dec_and_test(&hdev->ibh_ref))
659 kiblnd_hdev_destroy(hdev);
660 }
661
662 static inline int
663 kiblnd_dev_can_failover(kib_dev_t *dev)
664 {
665 if (!list_empty(&dev->ibd_fail_list)) /* already scheduled */
666 return 0;
667
668 if (*kiblnd_tunables.kib_dev_failover == 0) /* disabled */
669 return 0;
670
671 if (*kiblnd_tunables.kib_dev_failover > 1) /* force failover */
672 return 1;
673
674 return dev->ibd_can_failover;
675 }
676
677 #define kiblnd_conn_addref(conn) \
678 do { \
679 CDEBUG(D_NET, "conn[%p] (%d)++\n", \
680 (conn), atomic_read(&(conn)->ibc_refcount)); \
681 atomic_inc(&(conn)->ibc_refcount); \
682 } while (0)
683
684 #define kiblnd_conn_decref(conn) \
685 do { \
686 unsigned long flags; \
687 \
688 CDEBUG(D_NET, "conn[%p] (%d)--\n", \
689 (conn), atomic_read(&(conn)->ibc_refcount)); \
690 LASSERT_ATOMIC_POS(&(conn)->ibc_refcount); \
691 if (atomic_dec_and_test(&(conn)->ibc_refcount)) { \
692 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags); \
693 list_add_tail(&(conn)->ibc_list, \
694 &kiblnd_data.kib_connd_zombies); \
695 wake_up(&kiblnd_data.kib_connd_waitq); \
696 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);\
697 } \
698 } while (0)
699
700 #define kiblnd_peer_addref(peer) \
701 do { \
702 CDEBUG(D_NET, "peer[%p] -> %s (%d)++\n", \
703 (peer), libcfs_nid2str((peer)->ibp_nid), \
704 atomic_read (&(peer)->ibp_refcount)); \
705 atomic_inc(&(peer)->ibp_refcount); \
706 } while (0)
707
708 #define kiblnd_peer_decref(peer) \
709 do { \
710 CDEBUG(D_NET, "peer[%p] -> %s (%d)--\n", \
711 (peer), libcfs_nid2str((peer)->ibp_nid), \
712 atomic_read (&(peer)->ibp_refcount)); \
713 LASSERT_ATOMIC_POS(&(peer)->ibp_refcount); \
714 if (atomic_dec_and_test(&(peer)->ibp_refcount)) \
715 kiblnd_destroy_peer(peer); \
716 } while (0)
717
718 static inline struct list_head *
719 kiblnd_nid2peerlist (lnet_nid_t nid)
720 {
721 unsigned int hash =
722 ((unsigned int)nid) % kiblnd_data.kib_peer_hash_size;
723
724 return (&kiblnd_data.kib_peers [hash]);
725 }
726
727 static inline int
728 kiblnd_peer_active (kib_peer_t *peer)
729 {
730 /* Am I in the peer hash table? */
731 return (!list_empty(&peer->ibp_list));
732 }
733
734 static inline kib_conn_t *
735 kiblnd_get_conn_locked (kib_peer_t *peer)
736 {
737 LASSERT (!list_empty(&peer->ibp_conns));
738
739 /* just return the first connection */
740 return list_entry(peer->ibp_conns.next, kib_conn_t, ibc_list);
741 }
742
743 static inline int
744 kiblnd_send_keepalive(kib_conn_t *conn)
745 {
746 return (*kiblnd_tunables.kib_keepalive > 0) &&
747 cfs_time_after(jiffies, conn->ibc_last_send +
748 *kiblnd_tunables.kib_keepalive*HZ);
749 }
750
751 static inline int
752 kiblnd_need_noop(kib_conn_t *conn)
753 {
754 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
755
756 if (conn->ibc_outstanding_credits <
757 IBLND_CREDITS_HIGHWATER(conn->ibc_version) &&
758 !kiblnd_send_keepalive(conn))
759 return 0; /* No need to send NOOP */
760
761 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
762 if (!list_empty(&conn->ibc_tx_queue_nocred))
763 return 0; /* NOOP can be piggybacked */
764
765 /* No tx to piggyback NOOP onto or no credit to send a tx */
766 return (list_empty(&conn->ibc_tx_queue) ||
767 conn->ibc_credits == 0);
768 }
769
770 if (!list_empty(&conn->ibc_tx_noops) || /* NOOP already queued */
771 !list_empty(&conn->ibc_tx_queue_nocred) || /* piggyback NOOP */
772 conn->ibc_credits == 0) /* no credit */
773 return 0;
774
775 if (conn->ibc_credits == 1 && /* last credit reserved for */
776 conn->ibc_outstanding_credits == 0) /* giving back credits */
777 return 0;
778
779 /* No tx to piggyback NOOP onto or no credit to send a tx */
780 return (list_empty(&conn->ibc_tx_queue) || conn->ibc_credits == 1);
781 }
782
783 static inline void
784 kiblnd_abort_receives(kib_conn_t *conn)
785 {
786 ib_modify_qp(conn->ibc_cmid->qp,
787 &kiblnd_data.kib_error_qpa, IB_QP_STATE);
788 }
789
790 static inline const char *
791 kiblnd_queue2str (kib_conn_t *conn, struct list_head *q)
792 {
793 if (q == &conn->ibc_tx_queue)
794 return "tx_queue";
795
796 if (q == &conn->ibc_tx_queue_rsrvd)
797 return "tx_queue_rsrvd";
798
799 if (q == &conn->ibc_tx_queue_nocred)
800 return "tx_queue_nocred";
801
802 if (q == &conn->ibc_active_txs)
803 return "active_txs";
804
805 LBUG();
806 return NULL;
807 }
808
809 /* CAVEAT EMPTOR: We rely on descriptor alignment to allow us to use the
810 * lowest bits of the work request id to stash the work item type. */
811
812 #define IBLND_WID_TX 0
813 #define IBLND_WID_RDMA 1
814 #define IBLND_WID_RX 2
815 #define IBLND_WID_MASK 3UL
816
817 static inline __u64
818 kiblnd_ptr2wreqid (void *ptr, int type)
819 {
820 unsigned long lptr = (unsigned long)ptr;
821
822 LASSERT ((lptr & IBLND_WID_MASK) == 0);
823 LASSERT ((type & ~IBLND_WID_MASK) == 0);
824 return (__u64)(lptr | type);
825 }
826
827 static inline void *
828 kiblnd_wreqid2ptr (__u64 wreqid)
829 {
830 return (void *)(((unsigned long)wreqid) & ~IBLND_WID_MASK);
831 }
832
833 static inline int
834 kiblnd_wreqid2type (__u64 wreqid)
835 {
836 return (wreqid & IBLND_WID_MASK);
837 }
838
839 static inline void
840 kiblnd_set_conn_state (kib_conn_t *conn, int state)
841 {
842 conn->ibc_state = state;
843 mb();
844 }
845
846 static inline void
847 kiblnd_init_msg (kib_msg_t *msg, int type, int body_nob)
848 {
849 msg->ibm_type = type;
850 msg->ibm_nob = offsetof(kib_msg_t, ibm_u) + body_nob;
851 }
852
853 static inline int
854 kiblnd_rd_size (kib_rdma_desc_t *rd)
855 {
856 int i;
857 int size;
858
859 for (i = size = 0; i < rd->rd_nfrags; i++)
860 size += rd->rd_frags[i].rf_nob;
861
862 return size;
863 }
864
865 static inline __u64
866 kiblnd_rd_frag_addr(kib_rdma_desc_t *rd, int index)
867 {
868 return rd->rd_frags[index].rf_addr;
869 }
870
871 static inline __u32
872 kiblnd_rd_frag_size(kib_rdma_desc_t *rd, int index)
873 {
874 return rd->rd_frags[index].rf_nob;
875 }
876
877 static inline __u32
878 kiblnd_rd_frag_key(kib_rdma_desc_t *rd, int index)
879 {
880 return rd->rd_key;
881 }
882
883 static inline int
884 kiblnd_rd_consume_frag(kib_rdma_desc_t *rd, int index, __u32 nob)
885 {
886 if (nob < rd->rd_frags[index].rf_nob) {
887 rd->rd_frags[index].rf_addr += nob;
888 rd->rd_frags[index].rf_nob -= nob;
889 } else {
890 index ++;
891 }
892
893 return index;
894 }
895
896 static inline int
897 kiblnd_rd_msg_size(kib_rdma_desc_t *rd, int msgtype, int n)
898 {
899 LASSERT (msgtype == IBLND_MSG_GET_REQ ||
900 msgtype == IBLND_MSG_PUT_ACK);
901
902 return msgtype == IBLND_MSG_GET_REQ ?
903 offsetof(kib_get_msg_t, ibgm_rd.rd_frags[n]) :
904 offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[n]);
905 }
906
907
908 static inline __u64
909 kiblnd_dma_mapping_error(struct ib_device *dev, u64 dma_addr)
910 {
911 return ib_dma_mapping_error(dev, dma_addr);
912 }
913
914 static inline __u64 kiblnd_dma_map_single(struct ib_device *dev,
915 void *msg, size_t size,
916 enum dma_data_direction direction)
917 {
918 return ib_dma_map_single(dev, msg, size, direction);
919 }
920
921 static inline void kiblnd_dma_unmap_single(struct ib_device *dev,
922 __u64 addr, size_t size,
923 enum dma_data_direction direction)
924 {
925 ib_dma_unmap_single(dev, addr, size, direction);
926 }
927
928 #define KIBLND_UNMAP_ADDR_SET(p, m, a) do {} while (0)
929 #define KIBLND_UNMAP_ADDR(p, m, a) (a)
930
931 static inline int kiblnd_dma_map_sg(struct ib_device *dev,
932 struct scatterlist *sg, int nents,
933 enum dma_data_direction direction)
934 {
935 return ib_dma_map_sg(dev, sg, nents, direction);
936 }
937
938 static inline void kiblnd_dma_unmap_sg(struct ib_device *dev,
939 struct scatterlist *sg, int nents,
940 enum dma_data_direction direction)
941 {
942 ib_dma_unmap_sg(dev, sg, nents, direction);
943 }
944
945 static inline __u64 kiblnd_sg_dma_address(struct ib_device *dev,
946 struct scatterlist *sg)
947 {
948 return ib_sg_dma_address(dev, sg);
949 }
950
951 static inline unsigned int kiblnd_sg_dma_len(struct ib_device *dev,
952 struct scatterlist *sg)
953 {
954 return ib_sg_dma_len(dev, sg);
955 }
956
957 /* XXX We use KIBLND_CONN_PARAM(e) as writable buffer, it's not strictly
958 * right because OFED1.2 defines it as const, to use it we have to add
959 * (void *) cast to overcome "const" */
960
961 #define KIBLND_CONN_PARAM(e) ((e)->param.conn.private_data)
962 #define KIBLND_CONN_PARAM_LEN(e) ((e)->param.conn.private_data_len)
963
964
965 struct ib_mr *kiblnd_find_rd_dma_mr(kib_hca_dev_t *hdev,
966 kib_rdma_desc_t *rd);
967 struct ib_mr *kiblnd_find_dma_mr(kib_hca_dev_t *hdev,
968 __u64 addr, __u64 size);
969 void kiblnd_map_rx_descs(kib_conn_t *conn);
970 void kiblnd_unmap_rx_descs(kib_conn_t *conn);
971 int kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
972 kib_rdma_desc_t *rd, int nfrags);
973 void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx);
974 void kiblnd_pool_free_node(kib_pool_t *pool, struct list_head *node);
975 struct list_head *kiblnd_pool_alloc_node(kib_poolset_t *ps);
976
977 int kiblnd_fmr_pool_map(kib_fmr_poolset_t *fps, __u64 *pages,
978 int npages, __u64 iov, kib_fmr_t *fmr);
979 void kiblnd_fmr_pool_unmap(kib_fmr_t *fmr, int status);
980
981 int kiblnd_pmr_pool_map(kib_pmr_poolset_t *pps, kib_hca_dev_t *hdev,
982 kib_rdma_desc_t *rd, __u64 *iova, kib_phys_mr_t **pp_pmr);
983 void kiblnd_pmr_pool_unmap(kib_phys_mr_t *pmr);
984
985 int kiblnd_startup (lnet_ni_t *ni);
986 void kiblnd_shutdown (lnet_ni_t *ni);
987 int kiblnd_ctl (lnet_ni_t *ni, unsigned int cmd, void *arg);
988 void kiblnd_query (struct lnet_ni *ni, lnet_nid_t nid, unsigned long *when);
989
990 int kiblnd_tunables_init(void);
991 void kiblnd_tunables_fini(void);
992
993 int kiblnd_connd (void *arg);
994 int kiblnd_scheduler(void *arg);
995 int kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name);
996 int kiblnd_failover_thread (void *arg);
997
998 int kiblnd_alloc_pages(kib_pages_t **pp, int cpt, int npages);
999 void kiblnd_free_pages (kib_pages_t *p);
1000
1001 int kiblnd_cm_callback(struct rdma_cm_id *cmid,
1002 struct rdma_cm_event *event);
1003 int kiblnd_translate_mtu(int value);
1004
1005 int kiblnd_dev_failover(kib_dev_t *dev);
1006 int kiblnd_create_peer (lnet_ni_t *ni, kib_peer_t **peerp, lnet_nid_t nid);
1007 void kiblnd_destroy_peer (kib_peer_t *peer);
1008 void kiblnd_destroy_dev (kib_dev_t *dev);
1009 void kiblnd_unlink_peer_locked (kib_peer_t *peer);
1010 void kiblnd_peer_alive (kib_peer_t *peer);
1011 kib_peer_t *kiblnd_find_peer_locked (lnet_nid_t nid);
1012 void kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error);
1013 int kiblnd_close_stale_conns_locked (kib_peer_t *peer,
1014 int version, __u64 incarnation);
1015 int kiblnd_close_peer_conns_locked (kib_peer_t *peer, int why);
1016
1017 void kiblnd_connreq_done(kib_conn_t *conn, int status);
1018 kib_conn_t *kiblnd_create_conn (kib_peer_t *peer, struct rdma_cm_id *cmid,
1019 int state, int version);
1020 void kiblnd_destroy_conn (kib_conn_t *conn);
1021 void kiblnd_close_conn (kib_conn_t *conn, int error);
1022 void kiblnd_close_conn_locked (kib_conn_t *conn, int error);
1023
1024 int kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1025 int nob, kib_rdma_desc_t *dstrd, __u64 dstcookie);
1026
1027 void kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid);
1028 void kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn);
1029 void kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn);
1030 void kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob);
1031 void kiblnd_txlist_done (lnet_ni_t *ni, struct list_head *txlist,
1032 int status);
1033 void kiblnd_check_sends (kib_conn_t *conn);
1034
1035 void kiblnd_qp_event(struct ib_event *event, void *arg);
1036 void kiblnd_cq_event(struct ib_event *event, void *arg);
1037 void kiblnd_cq_completion(struct ib_cq *cq, void *arg);
1038
1039 void kiblnd_pack_msg (lnet_ni_t *ni, kib_msg_t *msg, int version,
1040 int credits, lnet_nid_t dstnid, __u64 dststamp);
1041 int kiblnd_unpack_msg(kib_msg_t *msg, int nob);
1042 int kiblnd_post_rx (kib_rx_t *rx, int credit);
1043
1044 int kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg);
1045 int kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1046 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1047 unsigned int offset, unsigned int mlen, unsigned int rlen);
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