blob: 059989fdb7d784592eef3f873b808d1b88a16afa [file] [log] [blame]
Andy Grover08b48a12009-02-24 15:30:32 +00001/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090034#include <linux/slab.h>
Andy Grover08b48a12009-02-24 15:30:32 +000035
36#include "rds.h"
37#include "rdma.h"
38#include "ib.h"
39
40
41/*
42 * This is stored as mr->r_trans_private.
43 */
44struct rds_ib_mr {
45 struct rds_ib_device *device;
46 struct rds_ib_mr_pool *pool;
47 struct ib_fmr *fmr;
48 struct list_head list;
49 unsigned int remap_count;
50
51 struct scatterlist *sg;
52 unsigned int sg_len;
53 u64 *dma;
54 int sg_dma_len;
55};
56
57/*
58 * Our own little FMR pool
59 */
60struct rds_ib_mr_pool {
61 struct mutex flush_lock; /* serialize fmr invalidate */
62 struct work_struct flush_worker; /* flush worker */
63
64 spinlock_t list_lock; /* protect variables below */
65 atomic_t item_count; /* total # of MRs */
66 atomic_t dirty_count; /* # dirty of MRs */
67 struct list_head drop_list; /* MRs that have reached their max_maps limit */
68 struct list_head free_list; /* unused MRs */
69 struct list_head clean_list; /* unused & unamapped MRs */
70 atomic_t free_pinned; /* memory pinned by free MRs */
71 unsigned long max_items;
72 unsigned long max_items_soft;
73 unsigned long max_free_pinned;
74 struct ib_fmr_attr fmr_attr;
75};
76
77static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all);
78static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr);
79static void rds_ib_mr_pool_flush_worker(struct work_struct *work);
80
81static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr)
82{
83 struct rds_ib_device *rds_ibdev;
84 struct rds_ib_ipaddr *i_ipaddr;
85
86 list_for_each_entry(rds_ibdev, &rds_ib_devices, list) {
87 spin_lock_irq(&rds_ibdev->spinlock);
88 list_for_each_entry(i_ipaddr, &rds_ibdev->ipaddr_list, list) {
89 if (i_ipaddr->ipaddr == ipaddr) {
90 spin_unlock_irq(&rds_ibdev->spinlock);
91 return rds_ibdev;
92 }
93 }
94 spin_unlock_irq(&rds_ibdev->spinlock);
95 }
96
97 return NULL;
98}
99
100static int rds_ib_add_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
101{
102 struct rds_ib_ipaddr *i_ipaddr;
103
104 i_ipaddr = kmalloc(sizeof *i_ipaddr, GFP_KERNEL);
105 if (!i_ipaddr)
106 return -ENOMEM;
107
108 i_ipaddr->ipaddr = ipaddr;
109
110 spin_lock_irq(&rds_ibdev->spinlock);
111 list_add_tail(&i_ipaddr->list, &rds_ibdev->ipaddr_list);
112 spin_unlock_irq(&rds_ibdev->spinlock);
113
114 return 0;
115}
116
117static void rds_ib_remove_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
118{
119 struct rds_ib_ipaddr *i_ipaddr, *next;
120
121 spin_lock_irq(&rds_ibdev->spinlock);
122 list_for_each_entry_safe(i_ipaddr, next, &rds_ibdev->ipaddr_list, list) {
123 if (i_ipaddr->ipaddr == ipaddr) {
124 list_del(&i_ipaddr->list);
125 kfree(i_ipaddr);
126 break;
127 }
128 }
129 spin_unlock_irq(&rds_ibdev->spinlock);
130}
131
132int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
133{
134 struct rds_ib_device *rds_ibdev_old;
135
136 rds_ibdev_old = rds_ib_get_device(ipaddr);
137 if (rds_ibdev_old)
138 rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr);
139
140 return rds_ib_add_ipaddr(rds_ibdev, ipaddr);
141}
142
Andy Grover745cbcc2009-04-01 08:20:19 +0000143void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn)
Andy Grover08b48a12009-02-24 15:30:32 +0000144{
145 struct rds_ib_connection *ic = conn->c_transport_data;
146
147 /* conn was previously on the nodev_conns_list */
148 spin_lock_irq(&ib_nodev_conns_lock);
149 BUG_ON(list_empty(&ib_nodev_conns));
150 BUG_ON(list_empty(&ic->ib_node));
151 list_del(&ic->ib_node);
Andy Grover08b48a12009-02-24 15:30:32 +0000152
153 spin_lock_irq(&rds_ibdev->spinlock);
154 list_add_tail(&ic->ib_node, &rds_ibdev->conn_list);
155 spin_unlock_irq(&rds_ibdev->spinlock);
Andy Grover08b48a12009-02-24 15:30:32 +0000156 spin_unlock_irq(&ib_nodev_conns_lock);
157
Andy Grover745cbcc2009-04-01 08:20:19 +0000158 ic->rds_ibdev = rds_ibdev;
Andy Grover08b48a12009-02-24 15:30:32 +0000159}
160
Andy Grover745cbcc2009-04-01 08:20:19 +0000161void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn)
162{
163 struct rds_ib_connection *ic = conn->c_transport_data;
164
165 /* place conn on nodev_conns_list */
166 spin_lock(&ib_nodev_conns_lock);
167
168 spin_lock_irq(&rds_ibdev->spinlock);
169 BUG_ON(list_empty(&ic->ib_node));
170 list_del(&ic->ib_node);
171 spin_unlock_irq(&rds_ibdev->spinlock);
172
173 list_add_tail(&ic->ib_node, &ib_nodev_conns);
174
175 spin_unlock(&ib_nodev_conns_lock);
176
177 ic->rds_ibdev = NULL;
178}
179
180void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock)
Andy Grover08b48a12009-02-24 15:30:32 +0000181{
182 struct rds_ib_connection *ic, *_ic;
183 LIST_HEAD(tmp_list);
184
185 /* avoid calling conn_destroy with irqs off */
Andy Grover745cbcc2009-04-01 08:20:19 +0000186 spin_lock_irq(list_lock);
187 list_splice(list, &tmp_list);
188 INIT_LIST_HEAD(list);
189 spin_unlock_irq(list_lock);
Andy Grover08b48a12009-02-24 15:30:32 +0000190
Andy Grover433d3082009-10-30 08:51:55 +0000191 list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node)
Andy Grover08b48a12009-02-24 15:30:32 +0000192 rds_conn_destroy(ic->conn);
Andy Grover08b48a12009-02-24 15:30:32 +0000193}
194
195struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev)
196{
197 struct rds_ib_mr_pool *pool;
198
199 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
200 if (!pool)
201 return ERR_PTR(-ENOMEM);
202
203 INIT_LIST_HEAD(&pool->free_list);
204 INIT_LIST_HEAD(&pool->drop_list);
205 INIT_LIST_HEAD(&pool->clean_list);
206 mutex_init(&pool->flush_lock);
207 spin_lock_init(&pool->list_lock);
208 INIT_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker);
209
210 pool->fmr_attr.max_pages = fmr_message_size;
211 pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps;
Andy Grovera870d622009-07-17 13:13:33 +0000212 pool->fmr_attr.page_shift = PAGE_SHIFT;
Andy Grover08b48a12009-02-24 15:30:32 +0000213 pool->max_free_pinned = rds_ibdev->max_fmrs * fmr_message_size / 4;
214
215 /* We never allow more than max_items MRs to be allocated.
216 * When we exceed more than max_items_soft, we start freeing
217 * items more aggressively.
218 * Make sure that max_items > max_items_soft > max_items / 2
219 */
220 pool->max_items_soft = rds_ibdev->max_fmrs * 3 / 4;
221 pool->max_items = rds_ibdev->max_fmrs;
222
223 return pool;
224}
225
226void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo)
227{
228 struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
229
230 iinfo->rdma_mr_max = pool->max_items;
231 iinfo->rdma_mr_size = pool->fmr_attr.max_pages;
232}
233
234void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool)
235{
236 flush_workqueue(rds_wq);
237 rds_ib_flush_mr_pool(pool, 1);
238 BUG_ON(atomic_read(&pool->item_count));
239 BUG_ON(atomic_read(&pool->free_pinned));
240 kfree(pool);
241}
242
243static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool)
244{
245 struct rds_ib_mr *ibmr = NULL;
246 unsigned long flags;
247
248 spin_lock_irqsave(&pool->list_lock, flags);
249 if (!list_empty(&pool->clean_list)) {
250 ibmr = list_entry(pool->clean_list.next, struct rds_ib_mr, list);
251 list_del_init(&ibmr->list);
252 }
253 spin_unlock_irqrestore(&pool->list_lock, flags);
254
255 return ibmr;
256}
257
258static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev)
259{
260 struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
261 struct rds_ib_mr *ibmr = NULL;
262 int err = 0, iter = 0;
263
264 while (1) {
265 ibmr = rds_ib_reuse_fmr(pool);
266 if (ibmr)
267 return ibmr;
268
269 /* No clean MRs - now we have the choice of either
270 * allocating a fresh MR up to the limit imposed by the
271 * driver, or flush any dirty unused MRs.
272 * We try to avoid stalling in the send path if possible,
273 * so we allocate as long as we're allowed to.
274 *
275 * We're fussy with enforcing the FMR limit, though. If the driver
276 * tells us we can't use more than N fmrs, we shouldn't start
277 * arguing with it */
278 if (atomic_inc_return(&pool->item_count) <= pool->max_items)
279 break;
280
281 atomic_dec(&pool->item_count);
282
283 if (++iter > 2) {
284 rds_ib_stats_inc(s_ib_rdma_mr_pool_depleted);
285 return ERR_PTR(-EAGAIN);
286 }
287
288 /* We do have some empty MRs. Flush them out. */
289 rds_ib_stats_inc(s_ib_rdma_mr_pool_wait);
290 rds_ib_flush_mr_pool(pool, 0);
291 }
292
293 ibmr = kzalloc(sizeof(*ibmr), GFP_KERNEL);
294 if (!ibmr) {
295 err = -ENOMEM;
296 goto out_no_cigar;
297 }
298
299 ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
300 (IB_ACCESS_LOCAL_WRITE |
301 IB_ACCESS_REMOTE_READ |
302 IB_ACCESS_REMOTE_WRITE),
303 &pool->fmr_attr);
304 if (IS_ERR(ibmr->fmr)) {
305 err = PTR_ERR(ibmr->fmr);
306 ibmr->fmr = NULL;
307 printk(KERN_WARNING "RDS/IB: ib_alloc_fmr failed (err=%d)\n", err);
308 goto out_no_cigar;
309 }
310
311 rds_ib_stats_inc(s_ib_rdma_mr_alloc);
312 return ibmr;
313
314out_no_cigar:
315 if (ibmr) {
316 if (ibmr->fmr)
317 ib_dealloc_fmr(ibmr->fmr);
318 kfree(ibmr);
319 }
320 atomic_dec(&pool->item_count);
321 return ERR_PTR(err);
322}
323
324static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr,
325 struct scatterlist *sg, unsigned int nents)
326{
327 struct ib_device *dev = rds_ibdev->dev;
328 struct scatterlist *scat = sg;
329 u64 io_addr = 0;
330 u64 *dma_pages;
331 u32 len;
332 int page_cnt, sg_dma_len;
333 int i, j;
334 int ret;
335
336 sg_dma_len = ib_dma_map_sg(dev, sg, nents,
337 DMA_BIDIRECTIONAL);
338 if (unlikely(!sg_dma_len)) {
339 printk(KERN_WARNING "RDS/IB: dma_map_sg failed!\n");
340 return -EBUSY;
341 }
342
343 len = 0;
344 page_cnt = 0;
345
346 for (i = 0; i < sg_dma_len; ++i) {
347 unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
348 u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
349
Andy Grovera870d622009-07-17 13:13:33 +0000350 if (dma_addr & ~PAGE_MASK) {
Andy Grover08b48a12009-02-24 15:30:32 +0000351 if (i > 0)
352 return -EINVAL;
353 else
354 ++page_cnt;
355 }
Andy Grovera870d622009-07-17 13:13:33 +0000356 if ((dma_addr + dma_len) & ~PAGE_MASK) {
Andy Grover08b48a12009-02-24 15:30:32 +0000357 if (i < sg_dma_len - 1)
358 return -EINVAL;
359 else
360 ++page_cnt;
361 }
362
363 len += dma_len;
364 }
365
Andy Grovera870d622009-07-17 13:13:33 +0000366 page_cnt += len >> PAGE_SHIFT;
Andy Grover08b48a12009-02-24 15:30:32 +0000367 if (page_cnt > fmr_message_size)
368 return -EINVAL;
369
370 dma_pages = kmalloc(sizeof(u64) * page_cnt, GFP_ATOMIC);
371 if (!dma_pages)
372 return -ENOMEM;
373
374 page_cnt = 0;
375 for (i = 0; i < sg_dma_len; ++i) {
376 unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
377 u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
378
Andy Grovera870d622009-07-17 13:13:33 +0000379 for (j = 0; j < dma_len; j += PAGE_SIZE)
Andy Grover08b48a12009-02-24 15:30:32 +0000380 dma_pages[page_cnt++] =
Andy Grovera870d622009-07-17 13:13:33 +0000381 (dma_addr & PAGE_MASK) + j;
Andy Grover08b48a12009-02-24 15:30:32 +0000382 }
383
384 ret = ib_map_phys_fmr(ibmr->fmr,
385 dma_pages, page_cnt, io_addr);
386 if (ret)
387 goto out;
388
389 /* Success - we successfully remapped the MR, so we can
390 * safely tear down the old mapping. */
391 rds_ib_teardown_mr(ibmr);
392
393 ibmr->sg = scat;
394 ibmr->sg_len = nents;
395 ibmr->sg_dma_len = sg_dma_len;
396 ibmr->remap_count++;
397
398 rds_ib_stats_inc(s_ib_rdma_mr_used);
399 ret = 0;
400
401out:
402 kfree(dma_pages);
403
404 return ret;
405}
406
407void rds_ib_sync_mr(void *trans_private, int direction)
408{
409 struct rds_ib_mr *ibmr = trans_private;
410 struct rds_ib_device *rds_ibdev = ibmr->device;
411
412 switch (direction) {
413 case DMA_FROM_DEVICE:
414 ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg,
415 ibmr->sg_dma_len, DMA_BIDIRECTIONAL);
416 break;
417 case DMA_TO_DEVICE:
418 ib_dma_sync_sg_for_device(rds_ibdev->dev, ibmr->sg,
419 ibmr->sg_dma_len, DMA_BIDIRECTIONAL);
420 break;
421 }
422}
423
424static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr)
425{
426 struct rds_ib_device *rds_ibdev = ibmr->device;
427
428 if (ibmr->sg_dma_len) {
429 ib_dma_unmap_sg(rds_ibdev->dev,
430 ibmr->sg, ibmr->sg_len,
431 DMA_BIDIRECTIONAL);
432 ibmr->sg_dma_len = 0;
433 }
434
435 /* Release the s/g list */
436 if (ibmr->sg_len) {
437 unsigned int i;
438
439 for (i = 0; i < ibmr->sg_len; ++i) {
440 struct page *page = sg_page(&ibmr->sg[i]);
441
442 /* FIXME we need a way to tell a r/w MR
443 * from a r/o MR */
444 set_page_dirty(page);
445 put_page(page);
446 }
447 kfree(ibmr->sg);
448
449 ibmr->sg = NULL;
450 ibmr->sg_len = 0;
451 }
452}
453
454static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr)
455{
456 unsigned int pinned = ibmr->sg_len;
457
458 __rds_ib_teardown_mr(ibmr);
459 if (pinned) {
460 struct rds_ib_device *rds_ibdev = ibmr->device;
461 struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
462
463 atomic_sub(pinned, &pool->free_pinned);
464 }
465}
466
467static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int free_all)
468{
469 unsigned int item_count;
470
471 item_count = atomic_read(&pool->item_count);
472 if (free_all)
473 return item_count;
474
475 return 0;
476}
477
478/*
479 * Flush our pool of MRs.
480 * At a minimum, all currently unused MRs are unmapped.
481 * If the number of MRs allocated exceeds the limit, we also try
482 * to free as many MRs as needed to get back to this limit.
483 */
484static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all)
485{
486 struct rds_ib_mr *ibmr, *next;
487 LIST_HEAD(unmap_list);
488 LIST_HEAD(fmr_list);
489 unsigned long unpinned = 0;
490 unsigned long flags;
491 unsigned int nfreed = 0, ncleaned = 0, free_goal;
492 int ret = 0;
493
494 rds_ib_stats_inc(s_ib_rdma_mr_pool_flush);
495
496 mutex_lock(&pool->flush_lock);
497
498 spin_lock_irqsave(&pool->list_lock, flags);
499 /* Get the list of all MRs to be dropped. Ordering matters -
500 * we want to put drop_list ahead of free_list. */
501 list_splice_init(&pool->free_list, &unmap_list);
502 list_splice_init(&pool->drop_list, &unmap_list);
503 if (free_all)
504 list_splice_init(&pool->clean_list, &unmap_list);
505 spin_unlock_irqrestore(&pool->list_lock, flags);
506
507 free_goal = rds_ib_flush_goal(pool, free_all);
508
509 if (list_empty(&unmap_list))
510 goto out;
511
512 /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
513 list_for_each_entry(ibmr, &unmap_list, list)
514 list_add(&ibmr->fmr->list, &fmr_list);
515 ret = ib_unmap_fmr(&fmr_list);
516 if (ret)
517 printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret);
518
519 /* Now we can destroy the DMA mapping and unpin any pages */
520 list_for_each_entry_safe(ibmr, next, &unmap_list, list) {
521 unpinned += ibmr->sg_len;
522 __rds_ib_teardown_mr(ibmr);
523 if (nfreed < free_goal || ibmr->remap_count >= pool->fmr_attr.max_maps) {
524 rds_ib_stats_inc(s_ib_rdma_mr_free);
525 list_del(&ibmr->list);
526 ib_dealloc_fmr(ibmr->fmr);
527 kfree(ibmr);
528 nfreed++;
529 }
530 ncleaned++;
531 }
532
533 spin_lock_irqsave(&pool->list_lock, flags);
534 list_splice(&unmap_list, &pool->clean_list);
535 spin_unlock_irqrestore(&pool->list_lock, flags);
536
537 atomic_sub(unpinned, &pool->free_pinned);
538 atomic_sub(ncleaned, &pool->dirty_count);
539 atomic_sub(nfreed, &pool->item_count);
540
541out:
542 mutex_unlock(&pool->flush_lock);
543 return ret;
544}
545
546static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
547{
548 struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker);
549
550 rds_ib_flush_mr_pool(pool, 0);
551}
552
553void rds_ib_free_mr(void *trans_private, int invalidate)
554{
555 struct rds_ib_mr *ibmr = trans_private;
556 struct rds_ib_device *rds_ibdev = ibmr->device;
557 struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
558 unsigned long flags;
559
560 rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len);
561
562 /* Return it to the pool's free list */
563 spin_lock_irqsave(&pool->list_lock, flags);
564 if (ibmr->remap_count >= pool->fmr_attr.max_maps)
565 list_add(&ibmr->list, &pool->drop_list);
566 else
567 list_add(&ibmr->list, &pool->free_list);
568
569 atomic_add(ibmr->sg_len, &pool->free_pinned);
570 atomic_inc(&pool->dirty_count);
571 spin_unlock_irqrestore(&pool->list_lock, flags);
572
573 /* If we've pinned too many pages, request a flush */
Joe Perchesf64f9e72009-11-29 16:55:45 -0800574 if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned ||
575 atomic_read(&pool->dirty_count) >= pool->max_items / 10)
Andy Grover08b48a12009-02-24 15:30:32 +0000576 queue_work(rds_wq, &pool->flush_worker);
577
578 if (invalidate) {
579 if (likely(!in_interrupt())) {
580 rds_ib_flush_mr_pool(pool, 0);
581 } else {
582 /* We get here if the user created a MR marked
583 * as use_once and invalidate at the same time. */
584 queue_work(rds_wq, &pool->flush_worker);
585 }
586 }
587}
588
589void rds_ib_flush_mrs(void)
590{
591 struct rds_ib_device *rds_ibdev;
592
593 list_for_each_entry(rds_ibdev, &rds_ib_devices, list) {
594 struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
595
596 if (pool)
597 rds_ib_flush_mr_pool(pool, 0);
598 }
599}
600
601void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
602 struct rds_sock *rs, u32 *key_ret)
603{
604 struct rds_ib_device *rds_ibdev;
605 struct rds_ib_mr *ibmr = NULL;
606 int ret;
607
608 rds_ibdev = rds_ib_get_device(rs->rs_bound_addr);
609 if (!rds_ibdev) {
610 ret = -ENODEV;
611 goto out;
612 }
613
614 if (!rds_ibdev->mr_pool) {
615 ret = -ENODEV;
616 goto out;
617 }
618
619 ibmr = rds_ib_alloc_fmr(rds_ibdev);
620 if (IS_ERR(ibmr))
621 return ibmr;
622
623 ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
624 if (ret == 0)
625 *key_ret = ibmr->fmr->rkey;
626 else
627 printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret);
628
629 ibmr->device = rds_ibdev;
630
631 out:
632 if (ret) {
633 if (ibmr)
634 rds_ib_free_mr(ibmr, 0);
635 ibmr = ERR_PTR(ret);
636 }
637 return ibmr;
638}