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1/*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35#include <linux/errno.h>
36#include <linux/slab.h>
37
38#include <linux/mlx4/cmd.h>
39
40#include "mlx4.h"
41#include "icm.h"
42
43/*
44 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
45 */
46struct mlx4_mpt_entry {
47 __be32 flags;
48 __be32 qpn;
49 __be32 key;
50 __be32 pd_flags;
51 __be64 start;
52 __be64 length;
53 __be32 lkey;
54 __be32 win_cnt;
55 u8 reserved1[3];
56 u8 mtt_rep;
57 __be64 mtt_seg;
58 __be32 mtt_sz;
59 __be32 entity_size;
60 __be32 first_byte_offset;
61} __packed;
62
63#define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
64#define MLX4_MPT_FLAG_FREE (0x3UL << 28)
65#define MLX4_MPT_FLAG_MIO (1 << 17)
66#define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
67#define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
68#define MLX4_MPT_FLAG_REGION (1 << 8)
69
70#define MLX4_MPT_PD_FLAG_FAST_REG (1 << 27)
71#define MLX4_MPT_PD_FLAG_RAE (1 << 28)
72#define MLX4_MPT_PD_FLAG_EN_INV (3 << 24)
73
74#define MLX4_MPT_STATUS_SW 0xF0
75#define MLX4_MPT_STATUS_HW 0x00
76
77static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
78{
79 int o;
80 int m;
81 u32 seg;
82
83 spin_lock(&buddy->lock);
84
85 for (o = order; o <= buddy->max_order; ++o)
86 if (buddy->num_free[o]) {
87 m = 1 << (buddy->max_order - o);
88 seg = find_first_bit(buddy->bits[o], m);
89 if (seg < m)
90 goto found;
91 }
92
93 spin_unlock(&buddy->lock);
94 return -1;
95
96 found:
97 clear_bit(seg, buddy->bits[o]);
98 --buddy->num_free[o];
99
100 while (o > order) {
101 --o;
102 seg <<= 1;
103 set_bit(seg ^ 1, buddy->bits[o]);
104 ++buddy->num_free[o];
105 }
106
107 spin_unlock(&buddy->lock);
108
109 seg <<= order;
110
111 return seg;
112}
113
114static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
115{
116 seg >>= order;
117
118 spin_lock(&buddy->lock);
119
120 while (test_bit(seg ^ 1, buddy->bits[order])) {
121 clear_bit(seg ^ 1, buddy->bits[order]);
122 --buddy->num_free[order];
123 seg >>= 1;
124 ++order;
125 }
126
127 set_bit(seg, buddy->bits[order]);
128 ++buddy->num_free[order];
129
130 spin_unlock(&buddy->lock);
131}
132
133static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
134{
135 int i, s;
136
137 buddy->max_order = max_order;
138 spin_lock_init(&buddy->lock);
139
140 buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
141 GFP_KERNEL);
142 buddy->num_free = kzalloc((buddy->max_order + 1) * sizeof (int *),
143 GFP_KERNEL);
144 if (!buddy->bits || !buddy->num_free)
145 goto err_out;
146
147 for (i = 0; i <= buddy->max_order; ++i) {
148 s = BITS_TO_LONGS(1 << (buddy->max_order - i));
149 buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
150 if (!buddy->bits[i])
151 goto err_out_free;
152 bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
153 }
154
155 set_bit(0, buddy->bits[buddy->max_order]);
156 buddy->num_free[buddy->max_order] = 1;
157
158 return 0;
159
160err_out_free:
161 for (i = 0; i <= buddy->max_order; ++i)
162 kfree(buddy->bits[i]);
163
164err_out:
165 kfree(buddy->bits);
166 kfree(buddy->num_free);
167
168 return -ENOMEM;
169}
170
171static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
172{
173 int i;
174
175 for (i = 0; i <= buddy->max_order; ++i)
176 kfree(buddy->bits[i]);
177
178 kfree(buddy->bits);
179 kfree(buddy->num_free);
180}
181
182static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
183{
184 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
185 u32 seg;
186
187 seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
188 if (seg == -1)
189 return -1;
190
191 if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
192 seg + (1 << order) - 1)) {
193 mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
194 return -1;
195 }
196
197 return seg;
198}
199
200int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
201 struct mlx4_mtt *mtt)
202{
203 int i;
204
205 if (!npages) {
206 mtt->order = -1;
207 mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
208 return 0;
209 } else
210 mtt->page_shift = page_shift;
211
212 for (mtt->order = 0, i = dev->caps.mtts_per_seg; i < npages; i <<= 1)
213 ++mtt->order;
214
215 mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
216 if (mtt->first_seg == -1)
217 return -ENOMEM;
218
219 return 0;
220}
221EXPORT_SYMBOL_GPL(mlx4_mtt_init);
222
223void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
224{
225 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
226
227 if (mtt->order < 0)
228 return;
229
230 mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
231 mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
232 mtt->first_seg + (1 << mtt->order) - 1);
233}
234EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
235
236u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
237{
238 return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
239}
240EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
241
242static u32 hw_index_to_key(u32 ind)
243{
244 return (ind >> 24) | (ind << 8);
245}
246
247static u32 key_to_hw_index(u32 key)
248{
249 return (key << 24) | (key >> 8);
250}
251
252static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
253 int mpt_index)
254{
255 return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
256 MLX4_CMD_TIME_CLASS_B);
257}
258
259static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
260 int mpt_index)
261{
262 return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
263 !mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
264}
265
266int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
267 int npages, int page_shift, struct mlx4_mr *mr)
268{
269 struct mlx4_priv *priv = mlx4_priv(dev);
270 u32 index;
271 int err;
272
273 index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
274 if (index == -1)
275 return -ENOMEM;
276
277 mr->iova = iova;
278 mr->size = size;
279 mr->pd = pd;
280 mr->access = access;
281 mr->enabled = 0;
282 mr->key = hw_index_to_key(index);
283
284 err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
285 if (err)
286 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
287
288 return err;
289}
290EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
291
292void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
293{
294 struct mlx4_priv *priv = mlx4_priv(dev);
295 int err;
296
297 if (mr->enabled) {
298 err = mlx4_HW2SW_MPT(dev, NULL,
299 key_to_hw_index(mr->key) &
300 (dev->caps.num_mpts - 1));
301 if (err)
302 mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
303 }
304
305 mlx4_mtt_cleanup(dev, &mr->mtt);
306 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
307}
308EXPORT_SYMBOL_GPL(mlx4_mr_free);
309
310int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
311{
312 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
313 struct mlx4_cmd_mailbox *mailbox;
314 struct mlx4_mpt_entry *mpt_entry;
315 int err;
316
317 err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
318 if (err)
319 return err;
320
321 mailbox = mlx4_alloc_cmd_mailbox(dev);
322 if (IS_ERR(mailbox)) {
323 err = PTR_ERR(mailbox);
324 goto err_table;
325 }
326 mpt_entry = mailbox->buf;
327
328 memset(mpt_entry, 0, sizeof *mpt_entry);
329
330 mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_MIO |
331 MLX4_MPT_FLAG_REGION |
332 mr->access);
333
334 mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key));
335 mpt_entry->pd_flags = cpu_to_be32(mr->pd | MLX4_MPT_PD_FLAG_EN_INV);
336 mpt_entry->start = cpu_to_be64(mr->iova);
337 mpt_entry->length = cpu_to_be64(mr->size);
338 mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
339
340 if (mr->mtt.order < 0) {
341 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
342 mpt_entry->mtt_seg = 0;
343 } else {
344 mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
345 }
346
347 if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
348 /* fast register MR in free state */
349 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
350 mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
351 MLX4_MPT_PD_FLAG_RAE);
352 mpt_entry->mtt_sz = cpu_to_be32((1 << mr->mtt.order) *
353 dev->caps.mtts_per_seg);
354 } else {
355 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
356 }
357
358 err = mlx4_SW2HW_MPT(dev, mailbox,
359 key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
360 if (err) {
361 mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
362 goto err_cmd;
363 }
364
365 mr->enabled = 1;
366
367 mlx4_free_cmd_mailbox(dev, mailbox);
368
369 return 0;
370
371err_cmd:
372 mlx4_free_cmd_mailbox(dev, mailbox);
373
374err_table:
375 mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
376 return err;
377}
378EXPORT_SYMBOL_GPL(mlx4_mr_enable);
379
380static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
381 int start_index, int npages, u64 *page_list)
382{
383 struct mlx4_priv *priv = mlx4_priv(dev);
384 __be64 *mtts;
385 dma_addr_t dma_handle;
386 int i;
387 int s = start_index * sizeof (u64);
388
389 /* All MTTs must fit in the same page */
390 if (start_index / (PAGE_SIZE / sizeof (u64)) !=
391 (start_index + npages - 1) / (PAGE_SIZE / sizeof (u64)))
392 return -EINVAL;
393
394 if (start_index & (dev->caps.mtts_per_seg - 1))
395 return -EINVAL;
396
397 mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->first_seg +
398 s / dev->caps.mtt_entry_sz, &dma_handle);
399 if (!mtts)
400 return -ENOMEM;
401
402 dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle,
403 npages * sizeof (u64), DMA_TO_DEVICE);
404
405 for (i = 0; i < npages; ++i)
406 mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
407
408 dma_sync_single_for_device(&dev->pdev->dev, dma_handle,
409 npages * sizeof (u64), DMA_TO_DEVICE);
410
411 return 0;
412}
413
414int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
415 int start_index, int npages, u64 *page_list)
416{
417 int chunk;
418 int err;
419
420 if (mtt->order < 0)
421 return -EINVAL;
422
423 while (npages > 0) {
424 chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages);
425 err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
426 if (err)
427 return err;
428
429 npages -= chunk;
430 start_index += chunk;
431 page_list += chunk;
432 }
433
434 return 0;
435}
436EXPORT_SYMBOL_GPL(mlx4_write_mtt);
437
438int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
439 struct mlx4_buf *buf)
440{
441 u64 *page_list;
442 int err;
443 int i;
444
445 page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
446 if (!page_list)
447 return -ENOMEM;
448
449 for (i = 0; i < buf->npages; ++i)
450 if (buf->nbufs == 1)
451 page_list[i] = buf->direct.map + (i << buf->page_shift);
452 else
453 page_list[i] = buf->page_list[i].map;
454
455 err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
456
457 kfree(page_list);
458 return err;
459}
460EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
461
462int mlx4_init_mr_table(struct mlx4_dev *dev)
463{
464 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
465 int err;
466
467 err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
468 ~0, dev->caps.reserved_mrws, 0);
469 if (err)
470 return err;
471
472 err = mlx4_buddy_init(&mr_table->mtt_buddy,
473 ilog2(dev->caps.num_mtt_segs));
474 if (err)
475 goto err_buddy;
476
477 if (dev->caps.reserved_mtts) {
478 if (mlx4_alloc_mtt_range(dev, fls(dev->caps.reserved_mtts - 1)) == -1) {
479 mlx4_warn(dev, "MTT table of order %d is too small.\n",
480 mr_table->mtt_buddy.max_order);
481 err = -ENOMEM;
482 goto err_reserve_mtts;
483 }
484 }
485
486 return 0;
487
488err_reserve_mtts:
489 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
490
491err_buddy:
492 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
493
494 return err;
495}
496
497void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
498{
499 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
500
501 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
502 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
503}
504
505static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list,
506 int npages, u64 iova)
507{
508 int i, page_mask;
509
510 if (npages > fmr->max_pages)
511 return -EINVAL;
512
513 page_mask = (1 << fmr->page_shift) - 1;
514
515 /* We are getting page lists, so va must be page aligned. */
516 if (iova & page_mask)
517 return -EINVAL;
518
519 /* Trust the user not to pass misaligned data in page_list */
520 if (0)
521 for (i = 0; i < npages; ++i) {
522 if (page_list[i] & ~page_mask)
523 return -EINVAL;
524 }
525
526 if (fmr->maps >= fmr->max_maps)
527 return -EINVAL;
528
529 return 0;
530}
531
532int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,
533 int npages, u64 iova, u32 *lkey, u32 *rkey)
534{
535 u32 key;
536 int i, err;
537
538 err = mlx4_check_fmr(fmr, page_list, npages, iova);
539 if (err)
540 return err;
541
542 ++fmr->maps;
543
544 key = key_to_hw_index(fmr->mr.key);
545 key += dev->caps.num_mpts;
546 *lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
547
548 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
549
550 /* Make sure MPT status is visible before writing MTT entries */
551 wmb();
552
553 dma_sync_single_for_cpu(&dev->pdev->dev, fmr->dma_handle,
554 npages * sizeof(u64), DMA_TO_DEVICE);
555
556 for (i = 0; i < npages; ++i)
557 fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
558
559 dma_sync_single_for_device(&dev->pdev->dev, fmr->dma_handle,
560 npages * sizeof(u64), DMA_TO_DEVICE);
561
562 fmr->mpt->key = cpu_to_be32(key);
563 fmr->mpt->lkey = cpu_to_be32(key);
564 fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift));
565 fmr->mpt->start = cpu_to_be64(iova);
566
567 /* Make MTT entries are visible before setting MPT status */
568 wmb();
569
570 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW;
571
572 /* Make sure MPT status is visible before consumer can use FMR */
573 wmb();
574
575 return 0;
576}
577EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr);
578
579int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
580 int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
581{
582 struct mlx4_priv *priv = mlx4_priv(dev);
583 u64 mtt_seg;
584 int err = -ENOMEM;
585
586 if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
587 return -EINVAL;
588
589 /* All MTTs must fit in the same page */
590 if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
591 return -EINVAL;
592
593 fmr->page_shift = page_shift;
594 fmr->max_pages = max_pages;
595 fmr->max_maps = max_maps;
596 fmr->maps = 0;
597
598 err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages,
599 page_shift, &fmr->mr);
600 if (err)
601 return err;
602
603 mtt_seg = fmr->mr.mtt.first_seg * dev->caps.mtt_entry_sz;
604
605 fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
606 fmr->mr.mtt.first_seg,
607 &fmr->dma_handle);
608 if (!fmr->mtts) {
609 err = -ENOMEM;
610 goto err_free;
611 }
612
613 return 0;
614
615err_free:
616 mlx4_mr_free(dev, &fmr->mr);
617 return err;
618}
619EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
620
621int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
622{
623 struct mlx4_priv *priv = mlx4_priv(dev);
624 int err;
625
626 err = mlx4_mr_enable(dev, &fmr->mr);
627 if (err)
628 return err;
629
630 fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table,
631 key_to_hw_index(fmr->mr.key), NULL);
632 if (!fmr->mpt)
633 return -ENOMEM;
634
635 return 0;
636}
637EXPORT_SYMBOL_GPL(mlx4_fmr_enable);
638
639void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
640 u32 *lkey, u32 *rkey)
641{
642 if (!fmr->maps)
643 return;
644
645 fmr->maps = 0;
646
647 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
648}
649EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
650
651int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
652{
653 if (fmr->maps)
654 return -EBUSY;
655
656 fmr->mr.enabled = 0;
657 mlx4_mr_free(dev, &fmr->mr);
658
659 return 0;
660}
661EXPORT_SYMBOL_GPL(mlx4_fmr_free);
662
663int mlx4_SYNC_TPT(struct mlx4_dev *dev)
664{
665 return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000);
666}
667EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);