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[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / hw / ipath / ipath_qp.c
1 /*
2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/err.h>
35 #include <linux/sched.h>
36 #include <linux/vmalloc.h>
37
38 #include "ipath_verbs.h"
39 #include "ipath_kernel.h"
40
41 #define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
42 #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
43 #define mk_qpn(qpt, map, off) (((map) - (qpt)->map) * BITS_PER_PAGE + \
44 (off))
45 #define find_next_offset(map, off) find_next_zero_bit((map)->page, \
46 BITS_PER_PAGE, off)
47
48 /*
49 * Convert the AETH credit code into the number of credits.
50 */
51 static u32 credit_table[31] = {
52 0, /* 0 */
53 1, /* 1 */
54 2, /* 2 */
55 3, /* 3 */
56 4, /* 4 */
57 6, /* 5 */
58 8, /* 6 */
59 12, /* 7 */
60 16, /* 8 */
61 24, /* 9 */
62 32, /* A */
63 48, /* B */
64 64, /* C */
65 96, /* D */
66 128, /* E */
67 192, /* F */
68 256, /* 10 */
69 384, /* 11 */
70 512, /* 12 */
71 768, /* 13 */
72 1024, /* 14 */
73 1536, /* 15 */
74 2048, /* 16 */
75 3072, /* 17 */
76 4096, /* 18 */
77 6144, /* 19 */
78 8192, /* 1A */
79 12288, /* 1B */
80 16384, /* 1C */
81 24576, /* 1D */
82 32768 /* 1E */
83 };
84
85
86 static void get_map_page(struct ipath_qp_table *qpt, struct qpn_map *map)
87 {
88 unsigned long page = get_zeroed_page(GFP_KERNEL);
89 unsigned long flags;
90
91 /*
92 * Free the page if someone raced with us installing it.
93 */
94
95 spin_lock_irqsave(&qpt->lock, flags);
96 if (map->page)
97 free_page(page);
98 else
99 map->page = (void *)page;
100 spin_unlock_irqrestore(&qpt->lock, flags);
101 }
102
103
104 static int alloc_qpn(struct ipath_qp_table *qpt, enum ib_qp_type type)
105 {
106 u32 i, offset, max_scan, qpn;
107 struct qpn_map *map;
108 u32 ret = -1;
109
110 if (type == IB_QPT_SMI)
111 ret = 0;
112 else if (type == IB_QPT_GSI)
113 ret = 1;
114
115 if (ret != -1) {
116 map = &qpt->map[0];
117 if (unlikely(!map->page)) {
118 get_map_page(qpt, map);
119 if (unlikely(!map->page)) {
120 ret = -ENOMEM;
121 goto bail;
122 }
123 }
124 if (!test_and_set_bit(ret, map->page))
125 atomic_dec(&map->n_free);
126 else
127 ret = -EBUSY;
128 goto bail;
129 }
130
131 qpn = qpt->last + 1;
132 if (qpn >= QPN_MAX)
133 qpn = 2;
134 offset = qpn & BITS_PER_PAGE_MASK;
135 map = &qpt->map[qpn / BITS_PER_PAGE];
136 max_scan = qpt->nmaps - !offset;
137 for (i = 0;;) {
138 if (unlikely(!map->page)) {
139 get_map_page(qpt, map);
140 if (unlikely(!map->page))
141 break;
142 }
143 if (likely(atomic_read(&map->n_free))) {
144 do {
145 if (!test_and_set_bit(offset, map->page)) {
146 atomic_dec(&map->n_free);
147 qpt->last = qpn;
148 ret = qpn;
149 goto bail;
150 }
151 offset = find_next_offset(map, offset);
152 qpn = mk_qpn(qpt, map, offset);
153 /*
154 * This test differs from alloc_pidmap().
155 * If find_next_offset() does find a zero
156 * bit, we don't need to check for QPN
157 * wrapping around past our starting QPN.
158 * We just need to be sure we don't loop
159 * forever.
160 */
161 } while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
162 }
163 /*
164 * In order to keep the number of pages allocated to a
165 * minimum, we scan the all existing pages before increasing
166 * the size of the bitmap table.
167 */
168 if (++i > max_scan) {
169 if (qpt->nmaps == QPNMAP_ENTRIES)
170 break;
171 map = &qpt->map[qpt->nmaps++];
172 offset = 0;
173 } else if (map < &qpt->map[qpt->nmaps]) {
174 ++map;
175 offset = 0;
176 } else {
177 map = &qpt->map[0];
178 offset = 2;
179 }
180 qpn = mk_qpn(qpt, map, offset);
181 }
182
183 ret = -ENOMEM;
184
185 bail:
186 return ret;
187 }
188
189 static void free_qpn(struct ipath_qp_table *qpt, u32 qpn)
190 {
191 struct qpn_map *map;
192
193 map = qpt->map + qpn / BITS_PER_PAGE;
194 if (map->page)
195 clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
196 atomic_inc(&map->n_free);
197 }
198
199 /**
200 * ipath_alloc_qpn - allocate a QP number
201 * @qpt: the QP table
202 * @qp: the QP
203 * @type: the QP type (IB_QPT_SMI and IB_QPT_GSI are special)
204 *
205 * Allocate the next available QPN and put the QP into the hash table.
206 * The hash table holds a reference to the QP.
207 */
208 static int ipath_alloc_qpn(struct ipath_qp_table *qpt, struct ipath_qp *qp,
209 enum ib_qp_type type)
210 {
211 unsigned long flags;
212 int ret;
213
214 ret = alloc_qpn(qpt, type);
215 if (ret < 0)
216 goto bail;
217 qp->ibqp.qp_num = ret;
218
219 /* Add the QP to the hash table. */
220 spin_lock_irqsave(&qpt->lock, flags);
221
222 ret %= qpt->max;
223 qp->next = qpt->table[ret];
224 qpt->table[ret] = qp;
225 atomic_inc(&qp->refcount);
226
227 spin_unlock_irqrestore(&qpt->lock, flags);
228 ret = 0;
229
230 bail:
231 return ret;
232 }
233
234 /**
235 * ipath_free_qp - remove a QP from the QP table
236 * @qpt: the QP table
237 * @qp: the QP to remove
238 *
239 * Remove the QP from the table so it can't be found asynchronously by
240 * the receive interrupt routine.
241 */
242 static void ipath_free_qp(struct ipath_qp_table *qpt, struct ipath_qp *qp)
243 {
244 struct ipath_qp *q, **qpp;
245 unsigned long flags;
246
247 spin_lock_irqsave(&qpt->lock, flags);
248
249 /* Remove QP from the hash table. */
250 qpp = &qpt->table[qp->ibqp.qp_num % qpt->max];
251 for (; (q = *qpp) != NULL; qpp = &q->next) {
252 if (q == qp) {
253 *qpp = qp->next;
254 qp->next = NULL;
255 atomic_dec(&qp->refcount);
256 break;
257 }
258 }
259
260 spin_unlock_irqrestore(&qpt->lock, flags);
261 }
262
263 /**
264 * ipath_free_all_qps - check for QPs still in use
265 * @qpt: the QP table to empty
266 *
267 * There should not be any QPs still in use.
268 * Free memory for table.
269 */
270 unsigned ipath_free_all_qps(struct ipath_qp_table *qpt)
271 {
272 unsigned long flags;
273 struct ipath_qp *qp;
274 u32 n, qp_inuse = 0;
275
276 spin_lock_irqsave(&qpt->lock, flags);
277 for (n = 0; n < qpt->max; n++) {
278 qp = qpt->table[n];
279 qpt->table[n] = NULL;
280
281 for (; qp; qp = qp->next)
282 qp_inuse++;
283 }
284 spin_unlock_irqrestore(&qpt->lock, flags);
285
286 for (n = 0; n < ARRAY_SIZE(qpt->map); n++)
287 if (qpt->map[n].page)
288 free_page((unsigned long) qpt->map[n].page);
289 return qp_inuse;
290 }
291
292 /**
293 * ipath_lookup_qpn - return the QP with the given QPN
294 * @qpt: the QP table
295 * @qpn: the QP number to look up
296 *
297 * The caller is responsible for decrementing the QP reference count
298 * when done.
299 */
300 struct ipath_qp *ipath_lookup_qpn(struct ipath_qp_table *qpt, u32 qpn)
301 {
302 unsigned long flags;
303 struct ipath_qp *qp;
304
305 spin_lock_irqsave(&qpt->lock, flags);
306
307 for (qp = qpt->table[qpn % qpt->max]; qp; qp = qp->next) {
308 if (qp->ibqp.qp_num == qpn) {
309 atomic_inc(&qp->refcount);
310 break;
311 }
312 }
313
314 spin_unlock_irqrestore(&qpt->lock, flags);
315 return qp;
316 }
317
318 /**
319 * ipath_reset_qp - initialize the QP state to the reset state
320 * @qp: the QP to reset
321 * @type: the QP type
322 */
323 static void ipath_reset_qp(struct ipath_qp *qp, enum ib_qp_type type)
324 {
325 qp->remote_qpn = 0;
326 qp->qkey = 0;
327 qp->qp_access_flags = 0;
328 atomic_set(&qp->s_dma_busy, 0);
329 qp->s_flags &= IPATH_S_SIGNAL_REQ_WR;
330 qp->s_hdrwords = 0;
331 qp->s_wqe = NULL;
332 qp->s_pkt_delay = 0;
333 qp->s_draining = 0;
334 qp->s_psn = 0;
335 qp->r_psn = 0;
336 qp->r_msn = 0;
337 if (type == IB_QPT_RC) {
338 qp->s_state = IB_OPCODE_RC_SEND_LAST;
339 qp->r_state = IB_OPCODE_RC_SEND_LAST;
340 } else {
341 qp->s_state = IB_OPCODE_UC_SEND_LAST;
342 qp->r_state = IB_OPCODE_UC_SEND_LAST;
343 }
344 qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
345 qp->r_nak_state = 0;
346 qp->r_aflags = 0;
347 qp->r_flags = 0;
348 qp->s_rnr_timeout = 0;
349 qp->s_head = 0;
350 qp->s_tail = 0;
351 qp->s_cur = 0;
352 qp->s_last = 0;
353 qp->s_ssn = 1;
354 qp->s_lsn = 0;
355 memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
356 qp->r_head_ack_queue = 0;
357 qp->s_tail_ack_queue = 0;
358 qp->s_num_rd_atomic = 0;
359 if (qp->r_rq.wq) {
360 qp->r_rq.wq->head = 0;
361 qp->r_rq.wq->tail = 0;
362 }
363 }
364
365 /**
366 * ipath_error_qp - put a QP into the error state
367 * @qp: the QP to put into the error state
368 * @err: the receive completion error to signal if a RWQE is active
369 *
370 * Flushes both send and receive work queues.
371 * Returns true if last WQE event should be generated.
372 * The QP s_lock should be held and interrupts disabled.
373 * If we are already in error state, just return.
374 */
375
376 int ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err)
377 {
378 struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
379 struct ib_wc wc;
380 int ret = 0;
381
382 if (qp->state == IB_QPS_ERR)
383 goto bail;
384
385 qp->state = IB_QPS_ERR;
386
387 spin_lock(&dev->pending_lock);
388 if (!list_empty(&qp->timerwait))
389 list_del_init(&qp->timerwait);
390 if (!list_empty(&qp->piowait))
391 list_del_init(&qp->piowait);
392 spin_unlock(&dev->pending_lock);
393
394 /* Schedule the sending tasklet to drain the send work queue. */
395 if (qp->s_last != qp->s_head)
396 ipath_schedule_send(qp);
397
398 memset(&wc, 0, sizeof(wc));
399 wc.qp = &qp->ibqp;
400 wc.opcode = IB_WC_RECV;
401
402 if (test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags)) {
403 wc.wr_id = qp->r_wr_id;
404 wc.status = err;
405 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
406 }
407 wc.status = IB_WC_WR_FLUSH_ERR;
408
409 if (qp->r_rq.wq) {
410 struct ipath_rwq *wq;
411 u32 head;
412 u32 tail;
413
414 spin_lock(&qp->r_rq.lock);
415
416 /* sanity check pointers before trusting them */
417 wq = qp->r_rq.wq;
418 head = wq->head;
419 if (head >= qp->r_rq.size)
420 head = 0;
421 tail = wq->tail;
422 if (tail >= qp->r_rq.size)
423 tail = 0;
424 while (tail != head) {
425 wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id;
426 if (++tail >= qp->r_rq.size)
427 tail = 0;
428 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
429 }
430 wq->tail = tail;
431
432 spin_unlock(&qp->r_rq.lock);
433 } else if (qp->ibqp.event_handler)
434 ret = 1;
435
436 bail:
437 return ret;
438 }
439
440 /**
441 * ipath_modify_qp - modify the attributes of a queue pair
442 * @ibqp: the queue pair who's attributes we're modifying
443 * @attr: the new attributes
444 * @attr_mask: the mask of attributes to modify
445 * @udata: user data for ipathverbs.so
446 *
447 * Returns 0 on success, otherwise returns an errno.
448 */
449 int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
450 int attr_mask, struct ib_udata *udata)
451 {
452 struct ipath_ibdev *dev = to_idev(ibqp->device);
453 struct ipath_qp *qp = to_iqp(ibqp);
454 enum ib_qp_state cur_state, new_state;
455 int lastwqe = 0;
456 int ret;
457
458 spin_lock_irq(&qp->s_lock);
459
460 cur_state = attr_mask & IB_QP_CUR_STATE ?
461 attr->cur_qp_state : qp->state;
462 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
463
464 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
465 attr_mask))
466 goto inval;
467
468 if (attr_mask & IB_QP_AV) {
469 if (attr->ah_attr.dlid == 0 ||
470 attr->ah_attr.dlid >= IPATH_MULTICAST_LID_BASE)
471 goto inval;
472
473 if ((attr->ah_attr.ah_flags & IB_AH_GRH) &&
474 (attr->ah_attr.grh.sgid_index > 1))
475 goto inval;
476 }
477
478 if (attr_mask & IB_QP_PKEY_INDEX)
479 if (attr->pkey_index >= ipath_get_npkeys(dev->dd))
480 goto inval;
481
482 if (attr_mask & IB_QP_MIN_RNR_TIMER)
483 if (attr->min_rnr_timer > 31)
484 goto inval;
485
486 if (attr_mask & IB_QP_PORT)
487 if (attr->port_num == 0 ||
488 attr->port_num > ibqp->device->phys_port_cnt)
489 goto inval;
490
491 /*
492 * don't allow invalid Path MTU values or greater than 2048
493 * unless we are configured for a 4KB MTU
494 */
495 if ((attr_mask & IB_QP_PATH_MTU) &&
496 (ib_mtu_enum_to_int(attr->path_mtu) == -1 ||
497 (attr->path_mtu > IB_MTU_2048 && !ipath_mtu4096)))
498 goto inval;
499
500 if (attr_mask & IB_QP_PATH_MIG_STATE)
501 if (attr->path_mig_state != IB_MIG_MIGRATED &&
502 attr->path_mig_state != IB_MIG_REARM)
503 goto inval;
504
505 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
506 if (attr->max_dest_rd_atomic > IPATH_MAX_RDMA_ATOMIC)
507 goto inval;
508
509 switch (new_state) {
510 case IB_QPS_RESET:
511 if (qp->state != IB_QPS_RESET) {
512 qp->state = IB_QPS_RESET;
513 spin_lock(&dev->pending_lock);
514 if (!list_empty(&qp->timerwait))
515 list_del_init(&qp->timerwait);
516 if (!list_empty(&qp->piowait))
517 list_del_init(&qp->piowait);
518 spin_unlock(&dev->pending_lock);
519 qp->s_flags &= ~IPATH_S_ANY_WAIT;
520 spin_unlock_irq(&qp->s_lock);
521 /* Stop the sending tasklet */
522 tasklet_kill(&qp->s_task);
523 wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
524 spin_lock_irq(&qp->s_lock);
525 }
526 ipath_reset_qp(qp, ibqp->qp_type);
527 break;
528
529 case IB_QPS_SQD:
530 qp->s_draining = qp->s_last != qp->s_cur;
531 qp->state = new_state;
532 break;
533
534 case IB_QPS_SQE:
535 if (qp->ibqp.qp_type == IB_QPT_RC)
536 goto inval;
537 qp->state = new_state;
538 break;
539
540 case IB_QPS_ERR:
541 lastwqe = ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR);
542 break;
543
544 default:
545 qp->state = new_state;
546 break;
547 }
548
549 if (attr_mask & IB_QP_PKEY_INDEX)
550 qp->s_pkey_index = attr->pkey_index;
551
552 if (attr_mask & IB_QP_DEST_QPN)
553 qp->remote_qpn = attr->dest_qp_num;
554
555 if (attr_mask & IB_QP_SQ_PSN) {
556 qp->s_psn = qp->s_next_psn = attr->sq_psn;
557 qp->s_last_psn = qp->s_next_psn - 1;
558 }
559
560 if (attr_mask & IB_QP_RQ_PSN)
561 qp->r_psn = attr->rq_psn;
562
563 if (attr_mask & IB_QP_ACCESS_FLAGS)
564 qp->qp_access_flags = attr->qp_access_flags;
565
566 if (attr_mask & IB_QP_AV) {
567 qp->remote_ah_attr = attr->ah_attr;
568 qp->s_dmult = ipath_ib_rate_to_mult(attr->ah_attr.static_rate);
569 }
570
571 if (attr_mask & IB_QP_PATH_MTU)
572 qp->path_mtu = attr->path_mtu;
573
574 if (attr_mask & IB_QP_RETRY_CNT)
575 qp->s_retry = qp->s_retry_cnt = attr->retry_cnt;
576
577 if (attr_mask & IB_QP_RNR_RETRY) {
578 qp->s_rnr_retry = attr->rnr_retry;
579 if (qp->s_rnr_retry > 7)
580 qp->s_rnr_retry = 7;
581 qp->s_rnr_retry_cnt = qp->s_rnr_retry;
582 }
583
584 if (attr_mask & IB_QP_MIN_RNR_TIMER)
585 qp->r_min_rnr_timer = attr->min_rnr_timer;
586
587 if (attr_mask & IB_QP_TIMEOUT)
588 qp->timeout = attr->timeout;
589
590 if (attr_mask & IB_QP_QKEY)
591 qp->qkey = attr->qkey;
592
593 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
594 qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
595
596 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
597 qp->s_max_rd_atomic = attr->max_rd_atomic;
598
599 spin_unlock_irq(&qp->s_lock);
600
601 if (lastwqe) {
602 struct ib_event ev;
603
604 ev.device = qp->ibqp.device;
605 ev.element.qp = &qp->ibqp;
606 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
607 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
608 }
609 ret = 0;
610 goto bail;
611
612 inval:
613 spin_unlock_irq(&qp->s_lock);
614 ret = -EINVAL;
615
616 bail:
617 return ret;
618 }
619
620 int ipath_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
621 int attr_mask, struct ib_qp_init_attr *init_attr)
622 {
623 struct ipath_qp *qp = to_iqp(ibqp);
624
625 attr->qp_state = qp->state;
626 attr->cur_qp_state = attr->qp_state;
627 attr->path_mtu = qp->path_mtu;
628 attr->path_mig_state = 0;
629 attr->qkey = qp->qkey;
630 attr->rq_psn = qp->r_psn;
631 attr->sq_psn = qp->s_next_psn;
632 attr->dest_qp_num = qp->remote_qpn;
633 attr->qp_access_flags = qp->qp_access_flags;
634 attr->cap.max_send_wr = qp->s_size - 1;
635 attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1;
636 attr->cap.max_send_sge = qp->s_max_sge;
637 attr->cap.max_recv_sge = qp->r_rq.max_sge;
638 attr->cap.max_inline_data = 0;
639 attr->ah_attr = qp->remote_ah_attr;
640 memset(&attr->alt_ah_attr, 0, sizeof(attr->alt_ah_attr));
641 attr->pkey_index = qp->s_pkey_index;
642 attr->alt_pkey_index = 0;
643 attr->en_sqd_async_notify = 0;
644 attr->sq_draining = qp->s_draining;
645 attr->max_rd_atomic = qp->s_max_rd_atomic;
646 attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
647 attr->min_rnr_timer = qp->r_min_rnr_timer;
648 attr->port_num = 1;
649 attr->timeout = qp->timeout;
650 attr->retry_cnt = qp->s_retry_cnt;
651 attr->rnr_retry = qp->s_rnr_retry_cnt;
652 attr->alt_port_num = 0;
653 attr->alt_timeout = 0;
654
655 init_attr->event_handler = qp->ibqp.event_handler;
656 init_attr->qp_context = qp->ibqp.qp_context;
657 init_attr->send_cq = qp->ibqp.send_cq;
658 init_attr->recv_cq = qp->ibqp.recv_cq;
659 init_attr->srq = qp->ibqp.srq;
660 init_attr->cap = attr->cap;
661 if (qp->s_flags & IPATH_S_SIGNAL_REQ_WR)
662 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
663 else
664 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
665 init_attr->qp_type = qp->ibqp.qp_type;
666 init_attr->port_num = 1;
667 return 0;
668 }
669
670 /**
671 * ipath_compute_aeth - compute the AETH (syndrome + MSN)
672 * @qp: the queue pair to compute the AETH for
673 *
674 * Returns the AETH.
675 */
676 __be32 ipath_compute_aeth(struct ipath_qp *qp)
677 {
678 u32 aeth = qp->r_msn & IPATH_MSN_MASK;
679
680 if (qp->ibqp.srq) {
681 /*
682 * Shared receive queues don't generate credits.
683 * Set the credit field to the invalid value.
684 */
685 aeth |= IPATH_AETH_CREDIT_INVAL << IPATH_AETH_CREDIT_SHIFT;
686 } else {
687 u32 min, max, x;
688 u32 credits;
689 struct ipath_rwq *wq = qp->r_rq.wq;
690 u32 head;
691 u32 tail;
692
693 /* sanity check pointers before trusting them */
694 head = wq->head;
695 if (head >= qp->r_rq.size)
696 head = 0;
697 tail = wq->tail;
698 if (tail >= qp->r_rq.size)
699 tail = 0;
700 /*
701 * Compute the number of credits available (RWQEs).
702 * XXX Not holding the r_rq.lock here so there is a small
703 * chance that the pair of reads are not atomic.
704 */
705 credits = head - tail;
706 if ((int)credits < 0)
707 credits += qp->r_rq.size;
708 /*
709 * Binary search the credit table to find the code to
710 * use.
711 */
712 min = 0;
713 max = 31;
714 for (;;) {
715 x = (min + max) / 2;
716 if (credit_table[x] == credits)
717 break;
718 if (credit_table[x] > credits)
719 max = x;
720 else if (min == x)
721 break;
722 else
723 min = x;
724 }
725 aeth |= x << IPATH_AETH_CREDIT_SHIFT;
726 }
727 return cpu_to_be32(aeth);
728 }
729
730 /**
731 * ipath_create_qp - create a queue pair for a device
732 * @ibpd: the protection domain who's device we create the queue pair for
733 * @init_attr: the attributes of the queue pair
734 * @udata: unused by InfiniPath
735 *
736 * Returns the queue pair on success, otherwise returns an errno.
737 *
738 * Called by the ib_create_qp() core verbs function.
739 */
740 struct ib_qp *ipath_create_qp(struct ib_pd *ibpd,
741 struct ib_qp_init_attr *init_attr,
742 struct ib_udata *udata)
743 {
744 struct ipath_qp *qp;
745 int err;
746 struct ipath_swqe *swq = NULL;
747 struct ipath_ibdev *dev;
748 size_t sz;
749 size_t sg_list_sz;
750 struct ib_qp *ret;
751
752 if (init_attr->create_flags) {
753 ret = ERR_PTR(-EINVAL);
754 goto bail;
755 }
756
757 if (init_attr->cap.max_send_sge > ib_ipath_max_sges ||
758 init_attr->cap.max_send_wr > ib_ipath_max_qp_wrs) {
759 ret = ERR_PTR(-EINVAL);
760 goto bail;
761 }
762
763 /* Check receive queue parameters if no SRQ is specified. */
764 if (!init_attr->srq) {
765 if (init_attr->cap.max_recv_sge > ib_ipath_max_sges ||
766 init_attr->cap.max_recv_wr > ib_ipath_max_qp_wrs) {
767 ret = ERR_PTR(-EINVAL);
768 goto bail;
769 }
770 if (init_attr->cap.max_send_sge +
771 init_attr->cap.max_send_wr +
772 init_attr->cap.max_recv_sge +
773 init_attr->cap.max_recv_wr == 0) {
774 ret = ERR_PTR(-EINVAL);
775 goto bail;
776 }
777 }
778
779 switch (init_attr->qp_type) {
780 case IB_QPT_UC:
781 case IB_QPT_RC:
782 case IB_QPT_UD:
783 case IB_QPT_SMI:
784 case IB_QPT_GSI:
785 sz = sizeof(struct ipath_sge) *
786 init_attr->cap.max_send_sge +
787 sizeof(struct ipath_swqe);
788 swq = vmalloc((init_attr->cap.max_send_wr + 1) * sz);
789 if (swq == NULL) {
790 ret = ERR_PTR(-ENOMEM);
791 goto bail;
792 }
793 sz = sizeof(*qp);
794 sg_list_sz = 0;
795 if (init_attr->srq) {
796 struct ipath_srq *srq = to_isrq(init_attr->srq);
797
798 if (srq->rq.max_sge > 1)
799 sg_list_sz = sizeof(*qp->r_sg_list) *
800 (srq->rq.max_sge - 1);
801 } else if (init_attr->cap.max_recv_sge > 1)
802 sg_list_sz = sizeof(*qp->r_sg_list) *
803 (init_attr->cap.max_recv_sge - 1);
804 qp = kmalloc(sz + sg_list_sz, GFP_KERNEL);
805 if (!qp) {
806 ret = ERR_PTR(-ENOMEM);
807 goto bail_swq;
808 }
809 if (sg_list_sz && (init_attr->qp_type == IB_QPT_UD ||
810 init_attr->qp_type == IB_QPT_SMI ||
811 init_attr->qp_type == IB_QPT_GSI)) {
812 qp->r_ud_sg_list = kmalloc(sg_list_sz, GFP_KERNEL);
813 if (!qp->r_ud_sg_list) {
814 ret = ERR_PTR(-ENOMEM);
815 goto bail_qp;
816 }
817 } else
818 qp->r_ud_sg_list = NULL;
819 if (init_attr->srq) {
820 sz = 0;
821 qp->r_rq.size = 0;
822 qp->r_rq.max_sge = 0;
823 qp->r_rq.wq = NULL;
824 init_attr->cap.max_recv_wr = 0;
825 init_attr->cap.max_recv_sge = 0;
826 } else {
827 qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
828 qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
829 sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
830 sizeof(struct ipath_rwqe);
831 qp->r_rq.wq = vmalloc_user(sizeof(struct ipath_rwq) +
832 qp->r_rq.size * sz);
833 if (!qp->r_rq.wq) {
834 ret = ERR_PTR(-ENOMEM);
835 goto bail_sg_list;
836 }
837 }
838
839 /*
840 * ib_create_qp() will initialize qp->ibqp
841 * except for qp->ibqp.qp_num.
842 */
843 spin_lock_init(&qp->s_lock);
844 spin_lock_init(&qp->r_rq.lock);
845 atomic_set(&qp->refcount, 0);
846 init_waitqueue_head(&qp->wait);
847 init_waitqueue_head(&qp->wait_dma);
848 tasklet_init(&qp->s_task, ipath_do_send, (unsigned long)qp);
849 INIT_LIST_HEAD(&qp->piowait);
850 INIT_LIST_HEAD(&qp->timerwait);
851 qp->state = IB_QPS_RESET;
852 qp->s_wq = swq;
853 qp->s_size = init_attr->cap.max_send_wr + 1;
854 qp->s_max_sge = init_attr->cap.max_send_sge;
855 if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
856 qp->s_flags = IPATH_S_SIGNAL_REQ_WR;
857 else
858 qp->s_flags = 0;
859 dev = to_idev(ibpd->device);
860 err = ipath_alloc_qpn(&dev->qp_table, qp,
861 init_attr->qp_type);
862 if (err) {
863 ret = ERR_PTR(err);
864 vfree(qp->r_rq.wq);
865 goto bail_sg_list;
866 }
867 qp->ip = NULL;
868 qp->s_tx = NULL;
869 ipath_reset_qp(qp, init_attr->qp_type);
870 break;
871
872 default:
873 /* Don't support raw QPs */
874 ret = ERR_PTR(-ENOSYS);
875 goto bail;
876 }
877
878 init_attr->cap.max_inline_data = 0;
879
880 /*
881 * Return the address of the RWQ as the offset to mmap.
882 * See ipath_mmap() for details.
883 */
884 if (udata && udata->outlen >= sizeof(__u64)) {
885 if (!qp->r_rq.wq) {
886 __u64 offset = 0;
887
888 err = ib_copy_to_udata(udata, &offset,
889 sizeof(offset));
890 if (err) {
891 ret = ERR_PTR(err);
892 goto bail_ip;
893 }
894 } else {
895 u32 s = sizeof(struct ipath_rwq) +
896 qp->r_rq.size * sz;
897
898 qp->ip =
899 ipath_create_mmap_info(dev, s,
900 ibpd->uobject->context,
901 qp->r_rq.wq);
902 if (!qp->ip) {
903 ret = ERR_PTR(-ENOMEM);
904 goto bail_ip;
905 }
906
907 err = ib_copy_to_udata(udata, &(qp->ip->offset),
908 sizeof(qp->ip->offset));
909 if (err) {
910 ret = ERR_PTR(err);
911 goto bail_ip;
912 }
913 }
914 }
915
916 spin_lock(&dev->n_qps_lock);
917 if (dev->n_qps_allocated == ib_ipath_max_qps) {
918 spin_unlock(&dev->n_qps_lock);
919 ret = ERR_PTR(-ENOMEM);
920 goto bail_ip;
921 }
922
923 dev->n_qps_allocated++;
924 spin_unlock(&dev->n_qps_lock);
925
926 if (qp->ip) {
927 spin_lock_irq(&dev->pending_lock);
928 list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps);
929 spin_unlock_irq(&dev->pending_lock);
930 }
931
932 ret = &qp->ibqp;
933 goto bail;
934
935 bail_ip:
936 if (qp->ip)
937 kref_put(&qp->ip->ref, ipath_release_mmap_info);
938 else
939 vfree(qp->r_rq.wq);
940 ipath_free_qp(&dev->qp_table, qp);
941 free_qpn(&dev->qp_table, qp->ibqp.qp_num);
942 bail_sg_list:
943 kfree(qp->r_ud_sg_list);
944 bail_qp:
945 kfree(qp);
946 bail_swq:
947 vfree(swq);
948 bail:
949 return ret;
950 }
951
952 /**
953 * ipath_destroy_qp - destroy a queue pair
954 * @ibqp: the queue pair to destroy
955 *
956 * Returns 0 on success.
957 *
958 * Note that this can be called while the QP is actively sending or
959 * receiving!
960 */
961 int ipath_destroy_qp(struct ib_qp *ibqp)
962 {
963 struct ipath_qp *qp = to_iqp(ibqp);
964 struct ipath_ibdev *dev = to_idev(ibqp->device);
965
966 /* Make sure HW and driver activity is stopped. */
967 spin_lock_irq(&qp->s_lock);
968 if (qp->state != IB_QPS_RESET) {
969 qp->state = IB_QPS_RESET;
970 spin_lock(&dev->pending_lock);
971 if (!list_empty(&qp->timerwait))
972 list_del_init(&qp->timerwait);
973 if (!list_empty(&qp->piowait))
974 list_del_init(&qp->piowait);
975 spin_unlock(&dev->pending_lock);
976 qp->s_flags &= ~IPATH_S_ANY_WAIT;
977 spin_unlock_irq(&qp->s_lock);
978 /* Stop the sending tasklet */
979 tasklet_kill(&qp->s_task);
980 wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
981 } else
982 spin_unlock_irq(&qp->s_lock);
983
984 ipath_free_qp(&dev->qp_table, qp);
985
986 if (qp->s_tx) {
987 atomic_dec(&qp->refcount);
988 if (qp->s_tx->txreq.flags & IPATH_SDMA_TXREQ_F_FREEBUF)
989 kfree(qp->s_tx->txreq.map_addr);
990 spin_lock_irq(&dev->pending_lock);
991 list_add(&qp->s_tx->txreq.list, &dev->txreq_free);
992 spin_unlock_irq(&dev->pending_lock);
993 qp->s_tx = NULL;
994 }
995
996 wait_event(qp->wait, !atomic_read(&qp->refcount));
997
998 /* all user's cleaned up, mark it available */
999 free_qpn(&dev->qp_table, qp->ibqp.qp_num);
1000 spin_lock(&dev->n_qps_lock);
1001 dev->n_qps_allocated--;
1002 spin_unlock(&dev->n_qps_lock);
1003
1004 if (qp->ip)
1005 kref_put(&qp->ip->ref, ipath_release_mmap_info);
1006 else
1007 vfree(qp->r_rq.wq);
1008 kfree(qp->r_ud_sg_list);
1009 vfree(qp->s_wq);
1010 kfree(qp);
1011 return 0;
1012 }
1013
1014 /**
1015 * ipath_init_qp_table - initialize the QP table for a device
1016 * @idev: the device who's QP table we're initializing
1017 * @size: the size of the QP table
1018 *
1019 * Returns 0 on success, otherwise returns an errno.
1020 */
1021 int ipath_init_qp_table(struct ipath_ibdev *idev, int size)
1022 {
1023 int i;
1024 int ret;
1025
1026 idev->qp_table.last = 1; /* QPN 0 and 1 are special. */
1027 idev->qp_table.max = size;
1028 idev->qp_table.nmaps = 1;
1029 idev->qp_table.table = kzalloc(size * sizeof(*idev->qp_table.table),
1030 GFP_KERNEL);
1031 if (idev->qp_table.table == NULL) {
1032 ret = -ENOMEM;
1033 goto bail;
1034 }
1035
1036 for (i = 0; i < ARRAY_SIZE(idev->qp_table.map); i++) {
1037 atomic_set(&idev->qp_table.map[i].n_free, BITS_PER_PAGE);
1038 idev->qp_table.map[i].page = NULL;
1039 }
1040
1041 ret = 0;
1042
1043 bail:
1044 return ret;
1045 }
1046
1047 /**
1048 * ipath_get_credit - flush the send work queue of a QP
1049 * @qp: the qp who's send work queue to flush
1050 * @aeth: the Acknowledge Extended Transport Header
1051 *
1052 * The QP s_lock should be held.
1053 */
1054 void ipath_get_credit(struct ipath_qp *qp, u32 aeth)
1055 {
1056 u32 credit = (aeth >> IPATH_AETH_CREDIT_SHIFT) & IPATH_AETH_CREDIT_MASK;
1057
1058 /*
1059 * If the credit is invalid, we can send
1060 * as many packets as we like. Otherwise, we have to
1061 * honor the credit field.
1062 */
1063 if (credit == IPATH_AETH_CREDIT_INVAL)
1064 qp->s_lsn = (u32) -1;
1065 else if (qp->s_lsn != (u32) -1) {
1066 /* Compute new LSN (i.e., MSN + credit) */
1067 credit = (aeth + credit_table[credit]) & IPATH_MSN_MASK;
1068 if (ipath_cmp24(credit, qp->s_lsn) > 0)
1069 qp->s_lsn = credit;
1070 }
1071
1072 /* Restart sending if it was blocked due to lack of credits. */
1073 if ((qp->s_flags & IPATH_S_WAIT_SSN_CREDIT) &&
1074 qp->s_cur != qp->s_head &&
1075 (qp->s_lsn == (u32) -1 ||
1076 ipath_cmp24(get_swqe_ptr(qp, qp->s_cur)->ssn,
1077 qp->s_lsn + 1) <= 0))
1078 ipath_schedule_send(qp);
1079 }
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