xref: /illumos-gate/usr/src/lib/librsm/common/rsmloopback.c (revision 012e6ce759c490003aed29439cc47d3d73a99ad3)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright (c) 1998-2001 by Sun Microsystems, Inc.
24  * All rights reserved.
25  */
26 
27 #include <stdio.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <sys/mman.h>
31 #include <sys/uio.h>
32 #include <sys/sysmacros.h>
33 #include <unistd.h>
34 #include <fcntl.h>
35 #include <dlfcn.h>
36 #include <sched.h>
37 #include <errno.h>
38 #include <strings.h>
39 
40 #include <rsmapi.h>
41 #include <sys/rsm/rsmndi.h>
42 #include <rsmlib_in.h>
43 #include <sys/rsm/rsm.h>
44 
45 extern int _rsm_memseg_import_map(rsm_memseg_import_handle_t,
46     void **,
47     rsm_attribute_t,
48     rsm_permission_t,
49     off_t, size_t);
50 
51 extern int _rsm_memseg_import_unmap(rsm_memseg_import_handle_t);
52 
53 static rsm_ndlib_attr_t _rsm_loopback_attr = {
54 	B_TRUE,		/* mapping needed for put/get */
55 	B_TRUE		/* mapping needed for putv/getv */
56 };
57 
58 static int
59 loopback_get8(rsm_memseg_import_handle_t im_memseg, off_t off,
60     uint8_t *datap,
61     ulong_t rep_cnt,
62     boolean_t swap)
63 {
64 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
65 	uint8_t *data_addr =
66 	    (uint8_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
67 	uint_t i = 0;
68 	int	e;
69 
70 	swap = swap;
71 
72 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
73 	    "loopback_get8: enter\n"));
74 
75 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
76 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
77 				(rsm_barrier_handle_t)seg->rsmseg_barrier);
78 		if (e != RSM_SUCCESS) {
79 			return (e);
80 		}
81 	}
82 
83 	for (i = 0; i < rep_cnt; i++) {
84 		datap[i] = data_addr[i];
85 	}
86 
87 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
88 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
89 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
90 		if (e != RSM_SUCCESS) {
91 			return (e);
92 		}
93 	}
94 
95 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
96 	    "loopback_get8: exit\n"));
97 
98 	return (RSM_SUCCESS);
99 }
100 
101 static int
102 loopback_get16(rsm_memseg_import_handle_t im_memseg, off_t off,
103     uint16_t *datap,
104     ulong_t rep_cnt,
105     boolean_t swap)
106 {
107 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
108 	uint16_t *data_addr =
109 	    /* LINTED */
110 	    (uint16_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
111 	uint_t i = 0;
112 	int	e;
113 
114 	swap = swap;
115 
116 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
117 	    "loopback_get16: enter\n"));
118 
119 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
120 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
121 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
122 		if (e != RSM_SUCCESS) {
123 			return (e);
124 		}
125 	}
126 
127 	for (i = 0; i < rep_cnt; i++) {
128 		datap[i] = data_addr[i];
129 	}
130 
131 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
132 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
133 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
134 		if (e != RSM_SUCCESS) {
135 			return (e);
136 		}
137 	}
138 
139 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
140 	    "loopback_get16: exit\n"));
141 
142 	return (RSM_SUCCESS);
143 }
144 
145 static int
146 loopback_get32(rsm_memseg_import_handle_t im_memseg, off_t off,
147     uint32_t *datap,
148     ulong_t rep_cnt,
149     boolean_t swap)
150 {
151 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
152 	uint32_t *data_addr =
153 	    /* LINTED */
154 	    (uint32_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
155 	uint_t i = 0;
156 	int	e;
157 
158 	swap = swap;
159 
160 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
161 	    "loopback_get32: enter\n"));
162 
163 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
164 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
165 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
166 		if (e != RSM_SUCCESS) {
167 			return (e);
168 		}
169 	}
170 
171 	for (i = 0; i < rep_cnt; i++) {
172 		datap[i] = data_addr[i];
173 	}
174 
175 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
176 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
177 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
178 		if (e != RSM_SUCCESS) {
179 			return (e);
180 		}
181 	}
182 
183 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
184 	    "loopback_get32: exit\n"));
185 
186 	return (RSM_SUCCESS);
187 }
188 
189 static int
190 loopback_get64(rsm_memseg_import_handle_t im_memseg, off_t off,
191     uint64_t *datap,
192     ulong_t rep_cnt,
193     boolean_t swap)
194 {
195 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
196 	uint64_t *data_addr =
197 	    /* LINTED */
198 	    (uint64_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
199 	uint_t i = 0;
200 	int	e;
201 
202 	swap = swap;
203 
204 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
205 	    "loopback_get64: enter\n"));
206 
207 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
208 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
209 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
210 		if (e != RSM_SUCCESS) {
211 			return (e);
212 		}
213 	}
214 
215 	for (i = 0; i < rep_cnt; i++) {
216 		datap[i] = data_addr[i];
217 	}
218 
219 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
220 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
221 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
222 		if (e != RSM_SUCCESS) {
223 			return (e);
224 		}
225 	}
226 
227 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
228 	    "loopback_get64: exit\n"));
229 
230 	return (RSM_SUCCESS);
231 }
232 
233 static int
234 loopback_put8(rsm_memseg_import_handle_t im_memseg, off_t off,
235     uint8_t *datap,
236     ulong_t rep_cnt,
237     boolean_t swap)
238 {
239 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
240 	uint8_t *data_addr =
241 		(uint8_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
242 	uint_t i = 0;
243 	int	e;
244 
245 	swap = swap;
246 
247 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
248 	    "loopback_put8: enter\n"));
249 
250 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
251 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
252 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
253 		if (e != RSM_SUCCESS) {
254 			return (e);
255 		}
256 	}
257 
258 	for (i = 0; i < rep_cnt; i++) {
259 		data_addr[i] = datap[i];
260 	}
261 
262 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
263 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
264 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
265 		if (e != RSM_SUCCESS) {
266 			return (e);
267 		}
268 	}
269 
270 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
271 	    "loopback_put8: exit\n"));
272 
273 	return (RSM_SUCCESS);
274 }
275 
276 static int
277 loopback_put16(rsm_memseg_import_handle_t im_memseg, off_t off,
278     uint16_t *datap,
279     ulong_t rep_cnt,
280     boolean_t swap)
281 {
282 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
283 	uint16_t *data_addr =
284 	    /* LINTED */
285 	    (uint16_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
286 	uint_t i = 0;
287 	int	e;
288 
289 	swap = swap;
290 
291 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
292 	    "loopback_put16: enter\n"));
293 
294 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
295 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
296 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
297 		if (e != RSM_SUCCESS) {
298 			return (e);
299 		}
300 	}
301 
302 	for (i = 0; i < rep_cnt; i++) {
303 		data_addr[i] = datap[i];
304 	}
305 
306 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
307 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
308 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
309 		if (e != RSM_SUCCESS) {
310 			return (e);
311 		}
312 	}
313 
314 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
315 	    "loopback_put16: exit\n"));
316 
317 	return (RSM_SUCCESS);
318 }
319 
320 static int
321 loopback_put32(rsm_memseg_import_handle_t im_memseg, off_t off,
322     uint32_t *datap,
323     ulong_t rep_cnt,
324     boolean_t swap)
325 {
326 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
327 	uint32_t *data_addr =
328 	    /* LINTED */
329 	    (uint32_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
330 	uint_t i = 0;
331 	int	e;
332 
333 	swap = swap;
334 
335 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
336 	    "loopback_put32: enter\n"));
337 
338 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
339 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
340 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
341 		if (e != RSM_SUCCESS) {
342 			return (e);
343 		}
344 	}
345 
346 	for (i = 0; i < rep_cnt; i++) {
347 		data_addr[i] = datap[i];
348 	}
349 
350 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
351 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
352 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
353 		if (e != RSM_SUCCESS) {
354 			return (e);
355 		}
356 	}
357 
358 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
359 	    "loopback_put32: exit\n"));
360 
361 	return (RSM_SUCCESS);
362 }
363 
364 static int
365 loopback_put64(rsm_memseg_import_handle_t im_memseg, off_t off,
366     uint64_t *datap,
367     ulong_t rep_cnt,
368     boolean_t swap)
369 {
370 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
371 	uint64_t *data_addr =
372 	    /* LINTED */
373 	    (uint64_t *)&seg->rsmseg_vaddr[off - seg->rsmseg_mapoffset];
374 	uint_t i = 0;
375 	int	e;
376 
377 	swap = swap;
378 
379 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
380 	    "loopback_put64: enter\n"));
381 
382 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
383 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
384 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
385 		if (e != RSM_SUCCESS) {
386 			return (e);
387 		}
388 	}
389 
390 	for (i = 0; i < rep_cnt; i++) {
391 		data_addr[i] = datap[i];
392 	}
393 
394 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
395 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
396 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
397 		if (e != RSM_SUCCESS) {
398 			return (e);
399 		}
400 	}
401 
402 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
403 	    "loopback_put64: exit\n"));
404 
405 	return (RSM_SUCCESS);
406 }
407 
408 static int
409 loopback_get(rsm_memseg_import_handle_t im_memseg, off_t offset, void *dst_addr,
410     size_t length)
411 {
412 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
413 	int	e;
414 
415 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
416 	    "loopback_get: enter\n"));
417 
418 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
419 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
420 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
421 		if (e != RSM_SUCCESS) {
422 			return (e);
423 		}
424 	}
425 
426 	bcopy(seg->rsmseg_vaddr + offset - seg->rsmseg_mapoffset, dst_addr,
427 		length);
428 
429 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
430 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
431 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
432 		if (e != RSM_SUCCESS) {
433 			return (e);
434 		}
435 	}
436 
437 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
438 	    "loopback_get: exit\n"));
439 
440 	return (RSM_SUCCESS);
441 }
442 
443 
444 /*
445  * Move data to each component of the io vector from the remote segment
446  */
447 int
448 loopback_getv(rsm_scat_gath_t *sg_io)
449 {
450 	rsm_iovec_t	*iovec = sg_io->iovec;
451 	rsmseg_handle_t *im_seg = (rsmseg_handle_t *)sg_io->remote_handle;
452 	int i;
453 
454 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
455 	    "loopback_getv: enter\n"));
456 
457 	/* do the vector data transfer */
458 	for (i = 0; i < sg_io->io_request_count; i++) {
459 		(void) bcopy(im_seg->rsmseg_vaddr + iovec->remote_offset,
460 		    iovec->local.vaddr + iovec->local_offset,
461 		    iovec->transfer_length);
462 		iovec++;
463 	}
464 
465 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
466 	    "loopback_getv: exit\n"));
467 
468 	sg_io->io_residual_count = 0;
469 
470 	return (RSM_SUCCESS);
471 }
472 
473 static int
474 loopback_put(rsm_memseg_import_handle_t im_memseg, off_t offset, void *src_addr,
475     size_t length)
476 {
477 	rsmseg_handle_t *seg = (rsmseg_handle_t *)im_memseg;
478 	int	e;
479 
480 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
481 	    "loopback_put: enter\n"));
482 
483 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
484 		e = seg->rsmseg_ops->rsm_memseg_import_open_barrier(
485 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
486 		if (e != RSM_SUCCESS) {
487 			return (e);
488 		}
489 	}
490 
491 	bcopy(src_addr, seg->rsmseg_vaddr + offset - seg->rsmseg_mapoffset,
492 		length);
493 
494 	if (seg->rsmseg_barmode == RSM_BARRIER_MODE_IMPLICIT) {
495 		e = seg->rsmseg_ops->rsm_memseg_import_close_barrier(
496 		    (rsm_barrier_handle_t)seg->rsmseg_barrier);
497 		if (e != RSM_SUCCESS) {
498 			return (e);
499 		}
500 	}
501 
502 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
503 	    "loopback_put: exit\n"));
504 
505 	return (RSM_SUCCESS);
506 }
507 
508 
509 /*
510  * Move data from each component of the io vector to the remote segment
511  */
512 int
513 loopback_putv(rsm_scat_gath_t *sg_io)
514 {
515 	rsm_iovec_t	*iovec = sg_io->iovec;
516 	rsmseg_handle_t *im_seg = (rsmseg_handle_t *)sg_io->remote_handle;
517 	int i;
518 
519 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
520 	    "loopback_putv: enter\n"));
521 
522 	/* do the vector data transfer */
523 	for (i = 0; i < sg_io->io_request_count; i++) {
524 		(void) bcopy(iovec->local.vaddr + iovec->local_offset,
525 		    im_seg->rsmseg_vaddr + iovec->remote_offset,
526 		    iovec->transfer_length);
527 		iovec++;
528 	}
529 
530 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
531 	    "loopback_putv: exit\n"));
532 
533 	sg_io->io_residual_count = 0;
534 
535 	return (RSM_SUCCESS);
536 }
537 
538 static int
539 loopback_create_handle(rsmapi_controller_handle_t controller,
540     rsm_localmemory_handle_t *local_handle,
541     caddr_t vaddr, size_t len)
542 {
543 
544 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
545 	    "loopback_create_handle: enter\n"));
546 
547 	controller = controller;
548 	len = len;
549 
550 	*local_handle = (rsm_localmemory_handle_t)vaddr;
551 
552 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
553 	    "loopback_create_handle: exit\n"));
554 
555 	return (RSM_SUCCESS);
556 }
557 
558 static int
559 loopback_free_handle(rsm_localmemory_handle_t handle)
560 {
561 
562 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
563 	    "loopback_free_handle: enter\n"));
564 
565 	handle = handle;
566 
567 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
568 	    "loopback_free_handle: exit\n"));
569 
570 	return (RSM_SUCCESS);
571 }
572 
573 
574 	/*
575 	 * import side memory segment operations (barriers):
576 	 */
577 static int
578 loopback_init_barrier(rsm_memseg_import_handle_t im_memseg,
579     rsm_barrier_type_t type,
580     rsm_barrier_handle_t barrier)
581 {
582 
583 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
584 	    "loopback_init_barrier: enter\n"));
585 
586 	type = type; im_memseg = im_memseg; barrier = barrier;
587 
588 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
589 	    "loopback_init_barrier: exit\n"));
590 
591 	return (RSM_SUCCESS);
592 }
593 
594 static int
595 loopback_open_barrier(rsm_barrier_handle_t barrier)
596 {
597 
598 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
599 	    "loopback_open_barrier: enter\n"));
600 
601 	barrier = barrier;
602 
603 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
604 	    "loopback_open_barrier: exit\n"));
605 
606 	return (RSM_SUCCESS);
607 }
608 
609 static int
610 loopback_order_barrier(rsm_barrier_handle_t barrier)
611 {
612 
613 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
614 	    "loopback_order_barrier: enter\n"));
615 
616 	barrier = barrier;
617 
618 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
619 	    "loopback_order_barrier: exit\n"));
620 
621 	return (RSM_SUCCESS);
622 }
623 
624 static int
625 loopback_close_barrier(rsm_barrier_handle_t barrier)
626 {
627 
628 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
629 	    "loopback_close_barrier: enter\n"));
630 
631 	barrier = barrier;
632 
633 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
634 	    "loopback_close_barrier: exit\n"));
635 
636 	return (RSM_SUCCESS);
637 }
638 
639 static int
640 loopback_destroy_barrier(rsm_barrier_handle_t barrier)
641 {
642 
643 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
644 	    "loopback_destroy_barrier: enter\n"));
645 
646 	barrier = barrier;
647 
648 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
649 	    "loopback_destroy_barrier: exit\n"));
650 
651 	return (RSM_SUCCESS);
652 }
653 
654 static int
655 loopback_get_lib_attr(rsm_ndlib_attr_t **libattrp)
656 {
657 
658 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
659 	    "loopback_get_lib_attr: enter\n"));
660 
661 	*libattrp = &_rsm_loopback_attr;
662 
663 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
664 	    "loopback_get_lib_attr: exit\n"));
665 
666 	return (RSM_SUCCESS);
667 }
668 /*
669  * If an entry is NULL, the parent will fill it out with its entry point.
670  */
671 void
672 __rsmloopback_init_ops(rsm_segops_t *segops)
673 {
674 
675 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
676 	    "__rsmloopback_init_ops: enter\n"));
677 
678 	segops->rsm_memseg_import_get8 = loopback_get8;
679 	segops->rsm_memseg_import_get16 = loopback_get16;
680 	segops->rsm_memseg_import_get32 = loopback_get32;
681 	segops->rsm_memseg_import_get64 = loopback_get64;
682 
683 	segops->rsm_memseg_import_put8 = loopback_put8;
684 	segops->rsm_memseg_import_put16 = loopback_put16;
685 	segops->rsm_memseg_import_put32 = loopback_put32;
686 	segops->rsm_memseg_import_put64 = loopback_put64;
687 
688 	segops->rsm_memseg_import_put = loopback_put;
689 	segops->rsm_memseg_import_get = loopback_get;
690 
691 	segops->rsm_memseg_import_putv = loopback_putv;
692 	segops->rsm_memseg_import_getv = loopback_getv;
693 
694 	segops->rsm_create_localmemory_handle = loopback_create_handle;
695 	segops->rsm_free_localmemory_handle = loopback_free_handle;
696 
697 	segops->rsm_memseg_import_init_barrier = loopback_init_barrier;
698 	segops->rsm_memseg_import_open_barrier = loopback_open_barrier;
699 	segops->rsm_memseg_import_order_barrier = loopback_order_barrier;
700 	segops->rsm_memseg_import_close_barrier = loopback_close_barrier;
701 	segops->rsm_memseg_import_destroy_barrier = loopback_destroy_barrier;
702 
703 	segops->rsm_get_lib_attr = loopback_get_lib_attr;
704 
705 	DBPRINTF((RSM_LIBRARY|RSM_LOOPBACK, RSM_DEBUG_VERBOSE,
706 	    "__rsmloopback_init_ops: exit\n"));
707 
708 }
709