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1 | /* |
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> |
34 | #include <linux/slab.h> |
35 | #include <linux/ratelimit.h> |
36 | |
37 | #include "rds.h" |
38 | #include "iw.h" |
39 | |
40 | |
41 | /* |
42 | * This is stored as mr->r_trans_private. |
43 | */ |
44 | struct rds_iw_mr { |
45 | struct rds_iw_device *device; |
46 | struct rds_iw_mr_pool *pool; |
47 | struct rdma_cm_id *cm_id; |
48 | |
49 | struct ib_mr *mr; |
50 | struct ib_fast_reg_page_list *page_list; |
51 | |
52 | struct rds_iw_mapping mapping; |
53 | unsigned char remap_count; |
54 | }; |
55 | |
56 | /* |
57 | * Our own little MR pool |
58 | */ |
59 | struct rds_iw_mr_pool { |
60 | struct rds_iw_device *device; /* back ptr to the device that owns us */ |
61 | |
62 | struct mutex flush_lock; /* serialize fmr invalidate */ |
63 | struct work_struct flush_worker; /* flush worker */ |
64 | |
65 | spinlock_t list_lock; /* protect variables below */ |
66 | atomic_t item_count; /* total # of MRs */ |
67 | atomic_t dirty_count; /* # dirty of MRs */ |
68 | struct list_head dirty_list; /* dirty mappings */ |
69 | struct list_head clean_list; /* unused & unamapped MRs */ |
70 | atomic_t free_pinned; /* memory pinned by free MRs */ |
71 | unsigned long max_message_size; /* in pages */ |
72 | unsigned long max_items; |
73 | unsigned long max_items_soft; |
74 | unsigned long max_free_pinned; |
75 | int max_pages; |
76 | }; |
77 | |
78 | static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all); |
79 | static void rds_iw_mr_pool_flush_worker(struct work_struct *work); |
80 | static int rds_iw_init_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr); |
81 | static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool, |
82 | struct rds_iw_mr *ibmr, |
83 | struct scatterlist *sg, unsigned int nents); |
84 | static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr); |
85 | static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool, |
86 | struct list_head *unmap_list, |
87 | struct list_head *kill_list, |
88 | int *unpinned); |
89 | static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool, struct rds_iw_mr *ibmr); |
90 | |
91 | static int rds_iw_get_device(struct rds_sock *rs, struct rds_iw_device **rds_iwdev, struct rdma_cm_id **cm_id) |
92 | { |
93 | struct rds_iw_device *iwdev; |
94 | struct rds_iw_cm_id *i_cm_id; |
95 | |
96 | *rds_iwdev = NULL; |
97 | *cm_id = NULL; |
98 | |
99 | list_for_each_entry(iwdev, &rds_iw_devices, list) { |
100 | spin_lock_irq(&iwdev->spinlock); |
101 | list_for_each_entry(i_cm_id, &iwdev->cm_id_list, list) { |
102 | struct sockaddr_in *src_addr, *dst_addr; |
103 | |
104 | src_addr = (struct sockaddr_in *)&i_cm_id->cm_id->route.addr.src_addr; |
105 | dst_addr = (struct sockaddr_in *)&i_cm_id->cm_id->route.addr.dst_addr; |
106 | |
107 | rdsdebug("local ipaddr = %x port %d, " |
108 | "remote ipaddr = %x port %d" |
109 | "..looking for %x port %d, " |
110 | "remote ipaddr = %x port %d\n", |
111 | src_addr->sin_addr.s_addr, |
112 | src_addr->sin_port, |
113 | dst_addr->sin_addr.s_addr, |
114 | dst_addr->sin_port, |
115 | rs->rs_bound_addr, |
116 | rs->rs_bound_port, |
117 | rs->rs_conn_addr, |
118 | rs->rs_conn_port); |
119 | #ifdef WORKING_TUPLE_DETECTION |
120 | if (src_addr->sin_addr.s_addr == rs->rs_bound_addr && |
121 | src_addr->sin_port == rs->rs_bound_port && |
122 | dst_addr->sin_addr.s_addr == rs->rs_conn_addr && |
123 | dst_addr->sin_port == rs->rs_conn_port) { |
124 | #else |
125 | /* FIXME - needs to compare the local and remote |
126 | * ipaddr/port tuple, but the ipaddr is the only |
127 | * available information in the rds_sock (as the rest are |
128 | * zero'ed. It doesn't appear to be properly populated |
129 | * during connection setup... |
130 | */ |
131 | if (src_addr->sin_addr.s_addr == rs->rs_bound_addr) { |
132 | #endif |
133 | spin_unlock_irq(&iwdev->spinlock); |
134 | *rds_iwdev = iwdev; |
135 | *cm_id = i_cm_id->cm_id; |
136 | return 0; |
137 | } |
138 | } |
139 | spin_unlock_irq(&iwdev->spinlock); |
140 | } |
141 | |
142 | return 1; |
143 | } |
144 | |
145 | static int rds_iw_add_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id) |
146 | { |
147 | struct rds_iw_cm_id *i_cm_id; |
148 | |
149 | i_cm_id = kmalloc(sizeof *i_cm_id, GFP_KERNEL); |
150 | if (!i_cm_id) |
151 | return -ENOMEM; |
152 | |
153 | i_cm_id->cm_id = cm_id; |
154 | |
155 | spin_lock_irq(&rds_iwdev->spinlock); |
156 | list_add_tail(&i_cm_id->list, &rds_iwdev->cm_id_list); |
157 | spin_unlock_irq(&rds_iwdev->spinlock); |
158 | |
159 | return 0; |
160 | } |
161 | |
162 | static void rds_iw_remove_cm_id(struct rds_iw_device *rds_iwdev, |
163 | struct rdma_cm_id *cm_id) |
164 | { |
165 | struct rds_iw_cm_id *i_cm_id; |
166 | |
167 | spin_lock_irq(&rds_iwdev->spinlock); |
168 | list_for_each_entry(i_cm_id, &rds_iwdev->cm_id_list, list) { |
169 | if (i_cm_id->cm_id == cm_id) { |
170 | list_del(&i_cm_id->list); |
171 | kfree(i_cm_id); |
172 | break; |
173 | } |
174 | } |
175 | spin_unlock_irq(&rds_iwdev->spinlock); |
176 | } |
177 | |
178 | |
179 | int rds_iw_update_cm_id(struct rds_iw_device *rds_iwdev, struct rdma_cm_id *cm_id) |
180 | { |
181 | struct sockaddr_in *src_addr, *dst_addr; |
182 | struct rds_iw_device *rds_iwdev_old; |
183 | struct rds_sock rs; |
184 | struct rdma_cm_id *pcm_id; |
185 | int rc; |
186 | |
187 | src_addr = (struct sockaddr_in *)&cm_id->route.addr.src_addr; |
188 | dst_addr = (struct sockaddr_in *)&cm_id->route.addr.dst_addr; |
189 | |
190 | rs.rs_bound_addr = src_addr->sin_addr.s_addr; |
191 | rs.rs_bound_port = src_addr->sin_port; |
192 | rs.rs_conn_addr = dst_addr->sin_addr.s_addr; |
193 | rs.rs_conn_port = dst_addr->sin_port; |
194 | |
195 | rc = rds_iw_get_device(&rs, &rds_iwdev_old, &pcm_id); |
196 | if (rc) |
197 | rds_iw_remove_cm_id(rds_iwdev, cm_id); |
198 | |
199 | return rds_iw_add_cm_id(rds_iwdev, cm_id); |
200 | } |
201 | |
202 | void rds_iw_add_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn) |
203 | { |
204 | struct rds_iw_connection *ic = conn->c_transport_data; |
205 | |
206 | /* conn was previously on the nodev_conns_list */ |
207 | spin_lock_irq(&iw_nodev_conns_lock); |
208 | BUG_ON(list_empty(&iw_nodev_conns)); |
209 | BUG_ON(list_empty(&ic->iw_node)); |
210 | list_del(&ic->iw_node); |
211 | |
212 | spin_lock(&rds_iwdev->spinlock); |
213 | list_add_tail(&ic->iw_node, &rds_iwdev->conn_list); |
214 | spin_unlock(&rds_iwdev->spinlock); |
215 | spin_unlock_irq(&iw_nodev_conns_lock); |
216 | |
217 | ic->rds_iwdev = rds_iwdev; |
218 | } |
219 | |
220 | void rds_iw_remove_conn(struct rds_iw_device *rds_iwdev, struct rds_connection *conn) |
221 | { |
222 | struct rds_iw_connection *ic = conn->c_transport_data; |
223 | |
224 | /* place conn on nodev_conns_list */ |
225 | spin_lock(&iw_nodev_conns_lock); |
226 | |
227 | spin_lock_irq(&rds_iwdev->spinlock); |
228 | BUG_ON(list_empty(&ic->iw_node)); |
229 | list_del(&ic->iw_node); |
230 | spin_unlock_irq(&rds_iwdev->spinlock); |
231 | |
232 | list_add_tail(&ic->iw_node, &iw_nodev_conns); |
233 | |
234 | spin_unlock(&iw_nodev_conns_lock); |
235 | |
236 | rds_iw_remove_cm_id(ic->rds_iwdev, ic->i_cm_id); |
237 | ic->rds_iwdev = NULL; |
238 | } |
239 | |
240 | void __rds_iw_destroy_conns(struct list_head *list, spinlock_t *list_lock) |
241 | { |
242 | struct rds_iw_connection *ic, *_ic; |
243 | LIST_HEAD(tmp_list); |
244 | |
245 | /* avoid calling conn_destroy with irqs off */ |
246 | spin_lock_irq(list_lock); |
247 | list_splice(list, &tmp_list); |
248 | INIT_LIST_HEAD(list); |
249 | spin_unlock_irq(list_lock); |
250 | |
251 | list_for_each_entry_safe(ic, _ic, &tmp_list, iw_node) |
252 | rds_conn_destroy(ic->conn); |
253 | } |
254 | |
255 | static void rds_iw_set_scatterlist(struct rds_iw_scatterlist *sg, |
256 | struct scatterlist *list, unsigned int sg_len) |
257 | { |
258 | sg->list = list; |
259 | sg->len = sg_len; |
260 | sg->dma_len = 0; |
261 | sg->dma_npages = 0; |
262 | sg->bytes = 0; |
263 | } |
264 | |
265 | static u64 *rds_iw_map_scatterlist(struct rds_iw_device *rds_iwdev, |
266 | struct rds_iw_scatterlist *sg) |
267 | { |
268 | struct ib_device *dev = rds_iwdev->dev; |
269 | u64 *dma_pages = NULL; |
270 | int i, j, ret; |
271 | |
272 | WARN_ON(sg->dma_len); |
273 | |
274 | sg->dma_len = ib_dma_map_sg(dev, sg->list, sg->len, DMA_BIDIRECTIONAL); |
275 | if (unlikely(!sg->dma_len)) { |
276 | printk(KERN_WARNING "RDS/IW: dma_map_sg failed!\n"); |
277 | return ERR_PTR(-EBUSY); |
278 | } |
279 | |
280 | sg->bytes = 0; |
281 | sg->dma_npages = 0; |
282 | |
283 | ret = -EINVAL; |
284 | for (i = 0; i < sg->dma_len; ++i) { |
285 | unsigned int dma_len = ib_sg_dma_len(dev, &sg->list[i]); |
286 | u64 dma_addr = ib_sg_dma_address(dev, &sg->list[i]); |
287 | u64 end_addr; |
288 | |
289 | sg->bytes += dma_len; |
290 | |
291 | end_addr = dma_addr + dma_len; |
292 | if (dma_addr & PAGE_MASK) { |
293 | if (i > 0) |
294 | goto out_unmap; |
295 | dma_addr &= ~PAGE_MASK; |
296 | } |
297 | if (end_addr & PAGE_MASK) { |
298 | if (i < sg->dma_len - 1) |
299 | goto out_unmap; |
300 | end_addr = (end_addr + PAGE_MASK) & ~PAGE_MASK; |
301 | } |
302 | |
303 | sg->dma_npages += (end_addr - dma_addr) >> PAGE_SHIFT; |
304 | } |
305 | |
306 | /* Now gather the dma addrs into one list */ |
307 | if (sg->dma_npages > fastreg_message_size) |
308 | goto out_unmap; |
309 | |
310 | dma_pages = kmalloc(sizeof(u64) * sg->dma_npages, GFP_ATOMIC); |
311 | if (!dma_pages) { |
312 | ret = -ENOMEM; |
313 | goto out_unmap; |
314 | } |
315 | |
316 | for (i = j = 0; i < sg->dma_len; ++i) { |
317 | unsigned int dma_len = ib_sg_dma_len(dev, &sg->list[i]); |
318 | u64 dma_addr = ib_sg_dma_address(dev, &sg->list[i]); |
319 | u64 end_addr; |
320 | |
321 | end_addr = dma_addr + dma_len; |
322 | dma_addr &= ~PAGE_MASK; |
323 | for (; dma_addr < end_addr; dma_addr += PAGE_SIZE) |
324 | dma_pages[j++] = dma_addr; |
325 | BUG_ON(j > sg->dma_npages); |
326 | } |
327 | |
328 | return dma_pages; |
329 | |
330 | out_unmap: |
331 | ib_dma_unmap_sg(rds_iwdev->dev, sg->list, sg->len, DMA_BIDIRECTIONAL); |
332 | sg->dma_len = 0; |
333 | kfree(dma_pages); |
334 | return ERR_PTR(ret); |
335 | } |
336 | |
337 | |
338 | struct rds_iw_mr_pool *rds_iw_create_mr_pool(struct rds_iw_device *rds_iwdev) |
339 | { |
340 | struct rds_iw_mr_pool *pool; |
341 | |
342 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); |
343 | if (!pool) { |
344 | printk(KERN_WARNING "RDS/IW: rds_iw_create_mr_pool alloc error\n"); |
345 | return ERR_PTR(-ENOMEM); |
346 | } |
347 | |
348 | pool->device = rds_iwdev; |
349 | INIT_LIST_HEAD(&pool->dirty_list); |
350 | INIT_LIST_HEAD(&pool->clean_list); |
351 | mutex_init(&pool->flush_lock); |
352 | spin_lock_init(&pool->list_lock); |
353 | INIT_WORK(&pool->flush_worker, rds_iw_mr_pool_flush_worker); |
354 | |
355 | pool->max_message_size = fastreg_message_size; |
356 | pool->max_items = fastreg_pool_size; |
357 | pool->max_free_pinned = pool->max_items * pool->max_message_size / 4; |
358 | pool->max_pages = fastreg_message_size; |
359 | |
360 | /* We never allow more than max_items MRs to be allocated. |
361 | * When we exceed more than max_items_soft, we start freeing |
362 | * items more aggressively. |
363 | * Make sure that max_items > max_items_soft > max_items / 2 |
364 | */ |
365 | pool->max_items_soft = pool->max_items * 3 / 4; |
366 | |
367 | return pool; |
368 | } |
369 | |
370 | void rds_iw_get_mr_info(struct rds_iw_device *rds_iwdev, struct rds_info_rdma_connection *iinfo) |
371 | { |
372 | struct rds_iw_mr_pool *pool = rds_iwdev->mr_pool; |
373 | |
374 | iinfo->rdma_mr_max = pool->max_items; |
375 | iinfo->rdma_mr_size = pool->max_pages; |
376 | } |
377 | |
378 | void rds_iw_destroy_mr_pool(struct rds_iw_mr_pool *pool) |
379 | { |
380 | flush_workqueue(rds_wq); |
381 | rds_iw_flush_mr_pool(pool, 1); |
382 | BUG_ON(atomic_read(&pool->item_count)); |
383 | BUG_ON(atomic_read(&pool->free_pinned)); |
384 | kfree(pool); |
385 | } |
386 | |
387 | static inline struct rds_iw_mr *rds_iw_reuse_fmr(struct rds_iw_mr_pool *pool) |
388 | { |
389 | struct rds_iw_mr *ibmr = NULL; |
390 | unsigned long flags; |
391 | |
392 | spin_lock_irqsave(&pool->list_lock, flags); |
393 | if (!list_empty(&pool->clean_list)) { |
394 | ibmr = list_entry(pool->clean_list.next, struct rds_iw_mr, mapping.m_list); |
395 | list_del_init(&ibmr->mapping.m_list); |
396 | } |
397 | spin_unlock_irqrestore(&pool->list_lock, flags); |
398 | |
399 | return ibmr; |
400 | } |
401 | |
402 | static struct rds_iw_mr *rds_iw_alloc_mr(struct rds_iw_device *rds_iwdev) |
403 | { |
404 | struct rds_iw_mr_pool *pool = rds_iwdev->mr_pool; |
405 | struct rds_iw_mr *ibmr = NULL; |
406 | int err = 0, iter = 0; |
407 | |
408 | while (1) { |
409 | ibmr = rds_iw_reuse_fmr(pool); |
410 | if (ibmr) |
411 | return ibmr; |
412 | |
413 | /* No clean MRs - now we have the choice of either |
414 | * allocating a fresh MR up to the limit imposed by the |
415 | * driver, or flush any dirty unused MRs. |
416 | * We try to avoid stalling in the send path if possible, |
417 | * so we allocate as long as we're allowed to. |
418 | * |
419 | * We're fussy with enforcing the FMR limit, though. If the driver |
420 | * tells us we can't use more than N fmrs, we shouldn't start |
421 | * arguing with it */ |
422 | if (atomic_inc_return(&pool->item_count) <= pool->max_items) |
423 | break; |
424 | |
425 | atomic_dec(&pool->item_count); |
426 | |
427 | if (++iter > 2) { |
428 | rds_iw_stats_inc(s_iw_rdma_mr_pool_depleted); |
429 | return ERR_PTR(-EAGAIN); |
430 | } |
431 | |
432 | /* We do have some empty MRs. Flush them out. */ |
433 | rds_iw_stats_inc(s_iw_rdma_mr_pool_wait); |
434 | rds_iw_flush_mr_pool(pool, 0); |
435 | } |
436 | |
437 | ibmr = kzalloc(sizeof(*ibmr), GFP_KERNEL); |
438 | if (!ibmr) { |
439 | err = -ENOMEM; |
440 | goto out_no_cigar; |
441 | } |
442 | |
443 | spin_lock_init(&ibmr->mapping.m_lock); |
444 | INIT_LIST_HEAD(&ibmr->mapping.m_list); |
445 | ibmr->mapping.m_mr = ibmr; |
446 | |
447 | err = rds_iw_init_fastreg(pool, ibmr); |
448 | if (err) |
449 | goto out_no_cigar; |
450 | |
451 | rds_iw_stats_inc(s_iw_rdma_mr_alloc); |
452 | return ibmr; |
453 | |
454 | out_no_cigar: |
455 | if (ibmr) { |
456 | rds_iw_destroy_fastreg(pool, ibmr); |
457 | kfree(ibmr); |
458 | } |
459 | atomic_dec(&pool->item_count); |
460 | return ERR_PTR(err); |
461 | } |
462 | |
463 | void rds_iw_sync_mr(void *trans_private, int direction) |
464 | { |
465 | struct rds_iw_mr *ibmr = trans_private; |
466 | struct rds_iw_device *rds_iwdev = ibmr->device; |
467 | |
468 | switch (direction) { |
469 | case DMA_FROM_DEVICE: |
470 | ib_dma_sync_sg_for_cpu(rds_iwdev->dev, ibmr->mapping.m_sg.list, |
471 | ibmr->mapping.m_sg.dma_len, DMA_BIDIRECTIONAL); |
472 | break; |
473 | case DMA_TO_DEVICE: |
474 | ib_dma_sync_sg_for_device(rds_iwdev->dev, ibmr->mapping.m_sg.list, |
475 | ibmr->mapping.m_sg.dma_len, DMA_BIDIRECTIONAL); |
476 | break; |
477 | } |
478 | } |
479 | |
480 | /* |
481 | * Flush our pool of MRs. |
482 | * At a minimum, all currently unused MRs are unmapped. |
483 | * If the number of MRs allocated exceeds the limit, we also try |
484 | * to free as many MRs as needed to get back to this limit. |
485 | */ |
486 | static int rds_iw_flush_mr_pool(struct rds_iw_mr_pool *pool, int free_all) |
487 | { |
488 | struct rds_iw_mr *ibmr, *next; |
489 | LIST_HEAD(unmap_list); |
490 | LIST_HEAD(kill_list); |
491 | unsigned long flags; |
492 | unsigned int nfreed = 0, ncleaned = 0, unpinned = 0; |
493 | int ret = 0; |
494 | |
495 | rds_iw_stats_inc(s_iw_rdma_mr_pool_flush); |
496 | |
497 | mutex_lock(&pool->flush_lock); |
498 | |
499 | spin_lock_irqsave(&pool->list_lock, flags); |
500 | /* Get the list of all mappings to be destroyed */ |
501 | list_splice_init(&pool->dirty_list, &unmap_list); |
502 | if (free_all) |
503 | list_splice_init(&pool->clean_list, &kill_list); |
504 | spin_unlock_irqrestore(&pool->list_lock, flags); |
505 | |
506 | /* Batched invalidate of dirty MRs. |
507 | * For FMR based MRs, the mappings on the unmap list are |
508 | * actually members of an ibmr (ibmr->mapping). They either |
509 | * migrate to the kill_list, or have been cleaned and should be |
510 | * moved to the clean_list. |
511 | * For fastregs, they will be dynamically allocated, and |
512 | * will be destroyed by the unmap function. |
513 | */ |
514 | if (!list_empty(&unmap_list)) { |
515 | ncleaned = rds_iw_unmap_fastreg_list(pool, &unmap_list, |
516 | &kill_list, &unpinned); |
517 | /* If we've been asked to destroy all MRs, move those |
518 | * that were simply cleaned to the kill list */ |
519 | if (free_all) |
520 | list_splice_init(&unmap_list, &kill_list); |
521 | } |
522 | |
523 | /* Destroy any MRs that are past their best before date */ |
524 | list_for_each_entry_safe(ibmr, next, &kill_list, mapping.m_list) { |
525 | rds_iw_stats_inc(s_iw_rdma_mr_free); |
526 | list_del(&ibmr->mapping.m_list); |
527 | rds_iw_destroy_fastreg(pool, ibmr); |
528 | kfree(ibmr); |
529 | nfreed++; |
530 | } |
531 | |
532 | /* Anything that remains are laundered ibmrs, which we can add |
533 | * back to the clean list. */ |
534 | if (!list_empty(&unmap_list)) { |
535 | spin_lock_irqsave(&pool->list_lock, flags); |
536 | list_splice(&unmap_list, &pool->clean_list); |
537 | spin_unlock_irqrestore(&pool->list_lock, flags); |
538 | } |
539 | |
540 | atomic_sub(unpinned, &pool->free_pinned); |
541 | atomic_sub(ncleaned, &pool->dirty_count); |
542 | atomic_sub(nfreed, &pool->item_count); |
543 | |
544 | mutex_unlock(&pool->flush_lock); |
545 | return ret; |
546 | } |
547 | |
548 | static void rds_iw_mr_pool_flush_worker(struct work_struct *work) |
549 | { |
550 | struct rds_iw_mr_pool *pool = container_of(work, struct rds_iw_mr_pool, flush_worker); |
551 | |
552 | rds_iw_flush_mr_pool(pool, 0); |
553 | } |
554 | |
555 | void rds_iw_free_mr(void *trans_private, int invalidate) |
556 | { |
557 | struct rds_iw_mr *ibmr = trans_private; |
558 | struct rds_iw_mr_pool *pool = ibmr->device->mr_pool; |
559 | |
560 | rdsdebug("RDS/IW: free_mr nents %u\n", ibmr->mapping.m_sg.len); |
561 | if (!pool) |
562 | return; |
563 | |
564 | /* Return it to the pool's free list */ |
565 | rds_iw_free_fastreg(pool, ibmr); |
566 | |
567 | /* If we've pinned too many pages, request a flush */ |
568 | if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned || |
569 | atomic_read(&pool->dirty_count) >= pool->max_items / 10) |
570 | queue_work(rds_wq, &pool->flush_worker); |
571 | |
572 | if (invalidate) { |
573 | if (likely(!in_interrupt())) { |
574 | rds_iw_flush_mr_pool(pool, 0); |
575 | } else { |
576 | /* We get here if the user created a MR marked |
577 | * as use_once and invalidate at the same time. */ |
578 | queue_work(rds_wq, &pool->flush_worker); |
579 | } |
580 | } |
581 | } |
582 | |
583 | void rds_iw_flush_mrs(void) |
584 | { |
585 | struct rds_iw_device *rds_iwdev; |
586 | |
587 | list_for_each_entry(rds_iwdev, &rds_iw_devices, list) { |
588 | struct rds_iw_mr_pool *pool = rds_iwdev->mr_pool; |
589 | |
590 | if (pool) |
591 | rds_iw_flush_mr_pool(pool, 0); |
592 | } |
593 | } |
594 | |
595 | void *rds_iw_get_mr(struct scatterlist *sg, unsigned long nents, |
596 | struct rds_sock *rs, u32 *key_ret) |
597 | { |
598 | struct rds_iw_device *rds_iwdev; |
599 | struct rds_iw_mr *ibmr = NULL; |
600 | struct rdma_cm_id *cm_id; |
601 | int ret; |
602 | |
603 | ret = rds_iw_get_device(rs, &rds_iwdev, &cm_id); |
604 | if (ret || !cm_id) { |
605 | ret = -ENODEV; |
606 | goto out; |
607 | } |
608 | |
609 | if (!rds_iwdev->mr_pool) { |
610 | ret = -ENODEV; |
611 | goto out; |
612 | } |
613 | |
614 | ibmr = rds_iw_alloc_mr(rds_iwdev); |
615 | if (IS_ERR(ibmr)) |
616 | return ibmr; |
617 | |
618 | ibmr->cm_id = cm_id; |
619 | ibmr->device = rds_iwdev; |
620 | |
621 | ret = rds_iw_map_fastreg(rds_iwdev->mr_pool, ibmr, sg, nents); |
622 | if (ret == 0) |
623 | *key_ret = ibmr->mr->rkey; |
624 | else |
625 | printk(KERN_WARNING "RDS/IW: failed to map mr (errno=%d)\n", ret); |
626 | |
627 | out: |
628 | if (ret) { |
629 | if (ibmr) |
630 | rds_iw_free_mr(ibmr, 0); |
631 | ibmr = ERR_PTR(ret); |
632 | } |
633 | return ibmr; |
634 | } |
635 | |
636 | /* |
637 | * iWARP fastreg handling |
638 | * |
639 | * The life cycle of a fastreg registration is a bit different from |
640 | * FMRs. |
641 | * The idea behind fastreg is to have one MR, to which we bind different |
642 | * mappings over time. To avoid stalling on the expensive map and invalidate |
643 | * operations, these operations are pipelined on the same send queue on |
644 | * which we want to send the message containing the r_key. |
645 | * |
646 | * This creates a bit of a problem for us, as we do not have the destination |
647 | * IP in GET_MR, so the connection must be setup prior to the GET_MR call for |
648 | * RDMA to be correctly setup. If a fastreg request is present, rds_iw_xmit |
649 | * will try to queue a LOCAL_INV (if needed) and a FAST_REG_MR work request |
650 | * before queuing the SEND. When completions for these arrive, they are |
651 | * dispatched to the MR has a bit set showing that RDMa can be performed. |
652 | * |
653 | * There is another interesting aspect that's related to invalidation. |
654 | * The application can request that a mapping is invalidated in FREE_MR. |
655 | * The expectation there is that this invalidation step includes ALL |
656 | * PREVIOUSLY FREED MRs. |
657 | */ |
658 | static int rds_iw_init_fastreg(struct rds_iw_mr_pool *pool, |
659 | struct rds_iw_mr *ibmr) |
660 | { |
661 | struct rds_iw_device *rds_iwdev = pool->device; |
662 | struct ib_fast_reg_page_list *page_list = NULL; |
663 | struct ib_mr *mr; |
664 | int err; |
665 | |
666 | mr = ib_alloc_fast_reg_mr(rds_iwdev->pd, pool->max_message_size); |
667 | if (IS_ERR(mr)) { |
668 | err = PTR_ERR(mr); |
669 | |
670 | printk(KERN_WARNING "RDS/IW: ib_alloc_fast_reg_mr failed (err=%d)\n", err); |
671 | return err; |
672 | } |
673 | |
674 | /* FIXME - this is overkill, but mapping->m_sg.dma_len/mapping->m_sg.dma_npages |
675 | * is not filled in. |
676 | */ |
677 | page_list = ib_alloc_fast_reg_page_list(rds_iwdev->dev, pool->max_message_size); |
678 | if (IS_ERR(page_list)) { |
679 | err = PTR_ERR(page_list); |
680 | |
681 | printk(KERN_WARNING "RDS/IW: ib_alloc_fast_reg_page_list failed (err=%d)\n", err); |
682 | ib_dereg_mr(mr); |
683 | return err; |
684 | } |
685 | |
686 | ibmr->page_list = page_list; |
687 | ibmr->mr = mr; |
688 | return 0; |
689 | } |
690 | |
691 | static int rds_iw_rdma_build_fastreg(struct rds_iw_mapping *mapping) |
692 | { |
693 | struct rds_iw_mr *ibmr = mapping->m_mr; |
694 | struct ib_send_wr f_wr, *failed_wr; |
695 | int ret; |
696 | |
697 | /* |
698 | * Perform a WR for the fast_reg_mr. Each individual page |
699 | * in the sg list is added to the fast reg page list and placed |
700 | * inside the fast_reg_mr WR. The key used is a rolling 8bit |
701 | * counter, which should guarantee uniqueness. |
702 | */ |
703 | ib_update_fast_reg_key(ibmr->mr, ibmr->remap_count++); |
704 | mapping->m_rkey = ibmr->mr->rkey; |
705 | |
706 | memset(&f_wr, 0, sizeof(f_wr)); |
707 | f_wr.wr_id = RDS_IW_FAST_REG_WR_ID; |
708 | f_wr.opcode = IB_WR_FAST_REG_MR; |
709 | f_wr.wr.fast_reg.length = mapping->m_sg.bytes; |
710 | f_wr.wr.fast_reg.rkey = mapping->m_rkey; |
711 | f_wr.wr.fast_reg.page_list = ibmr->page_list; |
712 | f_wr.wr.fast_reg.page_list_len = mapping->m_sg.dma_len; |
713 | f_wr.wr.fast_reg.page_shift = PAGE_SHIFT; |
714 | f_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE | |
715 | IB_ACCESS_REMOTE_READ | |
716 | IB_ACCESS_REMOTE_WRITE; |
717 | f_wr.wr.fast_reg.iova_start = 0; |
718 | f_wr.send_flags = IB_SEND_SIGNALED; |
719 | |
720 | failed_wr = &f_wr; |
721 | ret = ib_post_send(ibmr->cm_id->qp, &f_wr, &failed_wr); |
722 | BUG_ON(failed_wr != &f_wr); |
723 | if (ret) |
724 | printk_ratelimited(KERN_WARNING "RDS/IW: %s:%d ib_post_send returned %d\n", |
725 | __func__, __LINE__, ret); |
726 | return ret; |
727 | } |
728 | |
729 | static int rds_iw_rdma_fastreg_inv(struct rds_iw_mr *ibmr) |
730 | { |
731 | struct ib_send_wr s_wr, *failed_wr; |
732 | int ret = 0; |
733 | |
734 | if (!ibmr->cm_id->qp || !ibmr->mr) |
735 | goto out; |
736 | |
737 | memset(&s_wr, 0, sizeof(s_wr)); |
738 | s_wr.wr_id = RDS_IW_LOCAL_INV_WR_ID; |
739 | s_wr.opcode = IB_WR_LOCAL_INV; |
740 | s_wr.ex.invalidate_rkey = ibmr->mr->rkey; |
741 | s_wr.send_flags = IB_SEND_SIGNALED; |
742 | |
743 | failed_wr = &s_wr; |
744 | ret = ib_post_send(ibmr->cm_id->qp, &s_wr, &failed_wr); |
745 | if (ret) { |
746 | printk_ratelimited(KERN_WARNING "RDS/IW: %s:%d ib_post_send returned %d\n", |
747 | __func__, __LINE__, ret); |
748 | goto out; |
749 | } |
750 | out: |
751 | return ret; |
752 | } |
753 | |
754 | static int rds_iw_map_fastreg(struct rds_iw_mr_pool *pool, |
755 | struct rds_iw_mr *ibmr, |
756 | struct scatterlist *sg, |
757 | unsigned int sg_len) |
758 | { |
759 | struct rds_iw_device *rds_iwdev = pool->device; |
760 | struct rds_iw_mapping *mapping = &ibmr->mapping; |
761 | u64 *dma_pages; |
762 | int i, ret = 0; |
763 | |
764 | rds_iw_set_scatterlist(&mapping->m_sg, sg, sg_len); |
765 | |
766 | dma_pages = rds_iw_map_scatterlist(rds_iwdev, &mapping->m_sg); |
767 | if (IS_ERR(dma_pages)) { |
768 | ret = PTR_ERR(dma_pages); |
769 | dma_pages = NULL; |
770 | goto out; |
771 | } |
772 | |
773 | if (mapping->m_sg.dma_len > pool->max_message_size) { |
774 | ret = -EMSGSIZE; |
775 | goto out; |
776 | } |
777 | |
778 | for (i = 0; i < mapping->m_sg.dma_npages; ++i) |
779 | ibmr->page_list->page_list[i] = dma_pages[i]; |
780 | |
781 | ret = rds_iw_rdma_build_fastreg(mapping); |
782 | if (ret) |
783 | goto out; |
784 | |
785 | rds_iw_stats_inc(s_iw_rdma_mr_used); |
786 | |
787 | out: |
788 | kfree(dma_pages); |
789 | |
790 | return ret; |
791 | } |
792 | |
793 | /* |
794 | * "Free" a fastreg MR. |
795 | */ |
796 | static void rds_iw_free_fastreg(struct rds_iw_mr_pool *pool, |
797 | struct rds_iw_mr *ibmr) |
798 | { |
799 | unsigned long flags; |
800 | int ret; |
801 | |
802 | if (!ibmr->mapping.m_sg.dma_len) |
803 | return; |
804 | |
805 | ret = rds_iw_rdma_fastreg_inv(ibmr); |
806 | if (ret) |
807 | return; |
808 | |
809 | /* Try to post the LOCAL_INV WR to the queue. */ |
810 | spin_lock_irqsave(&pool->list_lock, flags); |
811 | |
812 | list_add_tail(&ibmr->mapping.m_list, &pool->dirty_list); |
813 | atomic_add(ibmr->mapping.m_sg.len, &pool->free_pinned); |
814 | atomic_inc(&pool->dirty_count); |
815 | |
816 | spin_unlock_irqrestore(&pool->list_lock, flags); |
817 | } |
818 | |
819 | static unsigned int rds_iw_unmap_fastreg_list(struct rds_iw_mr_pool *pool, |
820 | struct list_head *unmap_list, |
821 | struct list_head *kill_list, |
822 | int *unpinned) |
823 | { |
824 | struct rds_iw_mapping *mapping, *next; |
825 | unsigned int ncleaned = 0; |
826 | LIST_HEAD(laundered); |
827 | |
828 | /* Batched invalidation of fastreg MRs. |
829 | * Why do we do it this way, even though we could pipeline unmap |
830 | * and remap? The reason is the application semantics - when the |
831 | * application requests an invalidation of MRs, it expects all |
832 | * previously released R_Keys to become invalid. |
833 | * |
834 | * If we implement MR reuse naively, we risk memory corruption |
835 | * (this has actually been observed). So the default behavior |
836 | * requires that a MR goes through an explicit unmap operation before |
837 | * we can reuse it again. |
838 | * |
839 | * We could probably improve on this a little, by allowing immediate |
840 | * reuse of a MR on the same socket (eg you could add small |
841 | * cache of unused MRs to strct rds_socket - GET_MR could grab one |
842 | * of these without requiring an explicit invalidate). |
843 | */ |
844 | while (!list_empty(unmap_list)) { |
845 | unsigned long flags; |
846 | |
847 | spin_lock_irqsave(&pool->list_lock, flags); |
848 | list_for_each_entry_safe(mapping, next, unmap_list, m_list) { |
849 | *unpinned += mapping->m_sg.len; |
850 | list_move(&mapping->m_list, &laundered); |
851 | ncleaned++; |
852 | } |
853 | spin_unlock_irqrestore(&pool->list_lock, flags); |
854 | } |
855 | |
856 | /* Move all laundered mappings back to the unmap list. |
857 | * We do not kill any WRs right now - it doesn't seem the |
858 | * fastreg API has a max_remap limit. */ |
859 | list_splice_init(&laundered, unmap_list); |
860 | |
861 | return ncleaned; |
862 | } |
863 | |
864 | static void rds_iw_destroy_fastreg(struct rds_iw_mr_pool *pool, |
865 | struct rds_iw_mr *ibmr) |
866 | { |
867 | if (ibmr->page_list) |
868 | ib_free_fast_reg_page_list(ibmr->page_list); |
869 | if (ibmr->mr) |
870 | ib_dereg_mr(ibmr->mr); |
871 | } |
872 |
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