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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[deliverable/linux.git] / drivers / infiniband / hw / qib / qib_qp.c
1 /*
2 * Copyright (c) 2012, 2013 Intel Corporation. All rights reserved.
3 * Copyright (c) 2006 - 2012 QLogic Corporation. * All rights reserved.
4 * Copyright (c) 2005, 2006 PathScale, 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/err.h>
36 #include <linux/vmalloc.h>
37 #include <linux/jhash.h>
38 #ifdef CONFIG_DEBUG_FS
39 #include <linux/seq_file.h>
40 #endif
41
42 #include "qib.h"
43
44 #define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
45 #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
46
47 static inline unsigned mk_qpn(struct qib_qpn_table *qpt,
48 struct qpn_map *map, unsigned off)
49 {
50 return (map - qpt->map) * BITS_PER_PAGE + off;
51 }
52
53 static inline unsigned find_next_offset(struct qib_qpn_table *qpt,
54 struct qpn_map *map, unsigned off,
55 unsigned n)
56 {
57 if (qpt->mask) {
58 off++;
59 if (((off & qpt->mask) >> 1) >= n)
60 off = (off | qpt->mask) + 2;
61 } else
62 off = find_next_zero_bit(map->page, BITS_PER_PAGE, off);
63 return off;
64 }
65
66 /*
67 * Convert the AETH credit code into the number of credits.
68 */
69 static u32 credit_table[31] = {
70 0, /* 0 */
71 1, /* 1 */
72 2, /* 2 */
73 3, /* 3 */
74 4, /* 4 */
75 6, /* 5 */
76 8, /* 6 */
77 12, /* 7 */
78 16, /* 8 */
79 24, /* 9 */
80 32, /* A */
81 48, /* B */
82 64, /* C */
83 96, /* D */
84 128, /* E */
85 192, /* F */
86 256, /* 10 */
87 384, /* 11 */
88 512, /* 12 */
89 768, /* 13 */
90 1024, /* 14 */
91 1536, /* 15 */
92 2048, /* 16 */
93 3072, /* 17 */
94 4096, /* 18 */
95 6144, /* 19 */
96 8192, /* 1A */
97 12288, /* 1B */
98 16384, /* 1C */
99 24576, /* 1D */
100 32768 /* 1E */
101 };
102
103 static void get_map_page(struct qib_qpn_table *qpt, struct qpn_map *map,
104 gfp_t gfp)
105 {
106 unsigned long page = get_zeroed_page(gfp);
107
108 /*
109 * Free the page if someone raced with us installing it.
110 */
111
112 spin_lock(&qpt->lock);
113 if (map->page)
114 free_page(page);
115 else
116 map->page = (void *)page;
117 spin_unlock(&qpt->lock);
118 }
119
120 /*
121 * Allocate the next available QPN or
122 * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
123 */
124 static int alloc_qpn(struct qib_devdata *dd, struct qib_qpn_table *qpt,
125 enum ib_qp_type type, u8 port, gfp_t gfp)
126 {
127 u32 i, offset, max_scan, qpn;
128 struct qpn_map *map;
129 u32 ret;
130
131 if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
132 unsigned n;
133
134 ret = type == IB_QPT_GSI;
135 n = 1 << (ret + 2 * (port - 1));
136 spin_lock(&qpt->lock);
137 if (qpt->flags & n)
138 ret = -EINVAL;
139 else
140 qpt->flags |= n;
141 spin_unlock(&qpt->lock);
142 goto bail;
143 }
144
145 qpn = qpt->last + 2;
146 if (qpn >= QPN_MAX)
147 qpn = 2;
148 if (qpt->mask && ((qpn & qpt->mask) >> 1) >= dd->n_krcv_queues)
149 qpn = (qpn | qpt->mask) + 2;
150 offset = qpn & BITS_PER_PAGE_MASK;
151 map = &qpt->map[qpn / BITS_PER_PAGE];
152 max_scan = qpt->nmaps - !offset;
153 for (i = 0;;) {
154 if (unlikely(!map->page)) {
155 get_map_page(qpt, map, gfp);
156 if (unlikely(!map->page))
157 break;
158 }
159 do {
160 if (!test_and_set_bit(offset, map->page)) {
161 qpt->last = qpn;
162 ret = qpn;
163 goto bail;
164 }
165 offset = find_next_offset(qpt, map, offset,
166 dd->n_krcv_queues);
167 qpn = mk_qpn(qpt, map, offset);
168 /*
169 * This test differs from alloc_pidmap().
170 * If find_next_offset() does find a zero
171 * bit, we don't need to check for QPN
172 * wrapping around past our starting QPN.
173 * We just need to be sure we don't loop
174 * forever.
175 */
176 } while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
177 /*
178 * In order to keep the number of pages allocated to a
179 * minimum, we scan the all existing pages before increasing
180 * the size of the bitmap table.
181 */
182 if (++i > max_scan) {
183 if (qpt->nmaps == QPNMAP_ENTRIES)
184 break;
185 map = &qpt->map[qpt->nmaps++];
186 offset = 0;
187 } else if (map < &qpt->map[qpt->nmaps]) {
188 ++map;
189 offset = 0;
190 } else {
191 map = &qpt->map[0];
192 offset = 2;
193 }
194 qpn = mk_qpn(qpt, map, offset);
195 }
196
197 ret = -ENOMEM;
198
199 bail:
200 return ret;
201 }
202
203 static void free_qpn(struct qib_qpn_table *qpt, u32 qpn)
204 {
205 struct qpn_map *map;
206
207 map = qpt->map + qpn / BITS_PER_PAGE;
208 if (map->page)
209 clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
210 }
211
212 static inline unsigned qpn_hash(struct qib_ibdev *dev, u32 qpn)
213 {
214 return jhash_1word(qpn, dev->qp_rnd) &
215 (dev->qp_table_size - 1);
216 }
217
218
219 /*
220 * Put the QP into the hash table.
221 * The hash table holds a reference to the QP.
222 */
223 static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp)
224 {
225 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
226 unsigned long flags;
227 unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
228
229 atomic_inc(&qp->refcount);
230 spin_lock_irqsave(&dev->qpt_lock, flags);
231
232 if (qp->ibqp.qp_num == 0)
233 rcu_assign_pointer(ibp->qp0, qp);
234 else if (qp->ibqp.qp_num == 1)
235 rcu_assign_pointer(ibp->qp1, qp);
236 else {
237 qp->next = dev->qp_table[n];
238 rcu_assign_pointer(dev->qp_table[n], qp);
239 }
240
241 spin_unlock_irqrestore(&dev->qpt_lock, flags);
242 }
243
244 /*
245 * Remove the QP from the table so it can't be found asynchronously by
246 * the receive interrupt routine.
247 */
248 static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp)
249 {
250 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
251 unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
252 unsigned long flags;
253 int removed = 1;
254
255 spin_lock_irqsave(&dev->qpt_lock, flags);
256
257 if (rcu_dereference_protected(ibp->qp0,
258 lockdep_is_held(&dev->qpt_lock)) == qp) {
259 RCU_INIT_POINTER(ibp->qp0, NULL);
260 } else if (rcu_dereference_protected(ibp->qp1,
261 lockdep_is_held(&dev->qpt_lock)) == qp) {
262 RCU_INIT_POINTER(ibp->qp1, NULL);
263 } else {
264 struct qib_qp *q;
265 struct qib_qp __rcu **qpp;
266
267 removed = 0;
268 qpp = &dev->qp_table[n];
269 for (; (q = rcu_dereference_protected(*qpp,
270 lockdep_is_held(&dev->qpt_lock))) != NULL;
271 qpp = &q->next)
272 if (q == qp) {
273 RCU_INIT_POINTER(*qpp,
274 rcu_dereference_protected(qp->next,
275 lockdep_is_held(&dev->qpt_lock)));
276 removed = 1;
277 break;
278 }
279 }
280
281 spin_unlock_irqrestore(&dev->qpt_lock, flags);
282 if (removed) {
283 synchronize_rcu();
284 atomic_dec(&qp->refcount);
285 }
286 }
287
288 /**
289 * qib_free_all_qps - check for QPs still in use
290 * @qpt: the QP table to empty
291 *
292 * There should not be any QPs still in use.
293 * Free memory for table.
294 */
295 unsigned qib_free_all_qps(struct qib_devdata *dd)
296 {
297 struct qib_ibdev *dev = &dd->verbs_dev;
298 unsigned long flags;
299 struct qib_qp *qp;
300 unsigned n, qp_inuse = 0;
301
302 for (n = 0; n < dd->num_pports; n++) {
303 struct qib_ibport *ibp = &dd->pport[n].ibport_data;
304
305 if (!qib_mcast_tree_empty(ibp))
306 qp_inuse++;
307 rcu_read_lock();
308 if (rcu_dereference(ibp->qp0))
309 qp_inuse++;
310 if (rcu_dereference(ibp->qp1))
311 qp_inuse++;
312 rcu_read_unlock();
313 }
314
315 spin_lock_irqsave(&dev->qpt_lock, flags);
316 for (n = 0; n < dev->qp_table_size; n++) {
317 qp = rcu_dereference_protected(dev->qp_table[n],
318 lockdep_is_held(&dev->qpt_lock));
319 RCU_INIT_POINTER(dev->qp_table[n], NULL);
320
321 for (; qp; qp = rcu_dereference_protected(qp->next,
322 lockdep_is_held(&dev->qpt_lock)))
323 qp_inuse++;
324 }
325 spin_unlock_irqrestore(&dev->qpt_lock, flags);
326 synchronize_rcu();
327
328 return qp_inuse;
329 }
330
331 /**
332 * qib_lookup_qpn - return the QP with the given QPN
333 * @qpt: the QP table
334 * @qpn: the QP number to look up
335 *
336 * The caller is responsible for decrementing the QP reference count
337 * when done.
338 */
339 struct qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
340 {
341 struct qib_qp *qp = NULL;
342
343 rcu_read_lock();
344 if (unlikely(qpn <= 1)) {
345 if (qpn == 0)
346 qp = rcu_dereference(ibp->qp0);
347 else
348 qp = rcu_dereference(ibp->qp1);
349 if (qp)
350 atomic_inc(&qp->refcount);
351 } else {
352 struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
353 unsigned n = qpn_hash(dev, qpn);
354
355 for (qp = rcu_dereference(dev->qp_table[n]); qp;
356 qp = rcu_dereference(qp->next))
357 if (qp->ibqp.qp_num == qpn) {
358 atomic_inc(&qp->refcount);
359 break;
360 }
361 }
362 rcu_read_unlock();
363 return qp;
364 }
365
366 /**
367 * qib_reset_qp - initialize the QP state to the reset state
368 * @qp: the QP to reset
369 * @type: the QP type
370 */
371 static void qib_reset_qp(struct qib_qp *qp, enum ib_qp_type type)
372 {
373 qp->remote_qpn = 0;
374 qp->qkey = 0;
375 qp->qp_access_flags = 0;
376 atomic_set(&qp->s_dma_busy, 0);
377 qp->s_flags &= QIB_S_SIGNAL_REQ_WR;
378 qp->s_hdrwords = 0;
379 qp->s_wqe = NULL;
380 qp->s_draining = 0;
381 qp->s_next_psn = 0;
382 qp->s_last_psn = 0;
383 qp->s_sending_psn = 0;
384 qp->s_sending_hpsn = 0;
385 qp->s_psn = 0;
386 qp->r_psn = 0;
387 qp->r_msn = 0;
388 if (type == IB_QPT_RC) {
389 qp->s_state = IB_OPCODE_RC_SEND_LAST;
390 qp->r_state = IB_OPCODE_RC_SEND_LAST;
391 } else {
392 qp->s_state = IB_OPCODE_UC_SEND_LAST;
393 qp->r_state = IB_OPCODE_UC_SEND_LAST;
394 }
395 qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
396 qp->r_nak_state = 0;
397 qp->r_aflags = 0;
398 qp->r_flags = 0;
399 qp->s_head = 0;
400 qp->s_tail = 0;
401 qp->s_cur = 0;
402 qp->s_acked = 0;
403 qp->s_last = 0;
404 qp->s_ssn = 1;
405 qp->s_lsn = 0;
406 qp->s_mig_state = IB_MIG_MIGRATED;
407 memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
408 qp->r_head_ack_queue = 0;
409 qp->s_tail_ack_queue = 0;
410 qp->s_num_rd_atomic = 0;
411 if (qp->r_rq.wq) {
412 qp->r_rq.wq->head = 0;
413 qp->r_rq.wq->tail = 0;
414 }
415 qp->r_sge.num_sge = 0;
416 }
417
418 static void clear_mr_refs(struct qib_qp *qp, int clr_sends)
419 {
420 unsigned n;
421
422 if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
423 qib_put_ss(&qp->s_rdma_read_sge);
424
425 qib_put_ss(&qp->r_sge);
426
427 if (clr_sends) {
428 while (qp->s_last != qp->s_head) {
429 struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
430 unsigned i;
431
432 for (i = 0; i < wqe->wr.num_sge; i++) {
433 struct qib_sge *sge = &wqe->sg_list[i];
434
435 qib_put_mr(sge->mr);
436 }
437 if (qp->ibqp.qp_type == IB_QPT_UD ||
438 qp->ibqp.qp_type == IB_QPT_SMI ||
439 qp->ibqp.qp_type == IB_QPT_GSI)
440 atomic_dec(&to_iah(wqe->ud_wr.ah)->refcount);
441 if (++qp->s_last >= qp->s_size)
442 qp->s_last = 0;
443 }
444 if (qp->s_rdma_mr) {
445 qib_put_mr(qp->s_rdma_mr);
446 qp->s_rdma_mr = NULL;
447 }
448 }
449
450 if (qp->ibqp.qp_type != IB_QPT_RC)
451 return;
452
453 for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) {
454 struct qib_ack_entry *e = &qp->s_ack_queue[n];
455
456 if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST &&
457 e->rdma_sge.mr) {
458 qib_put_mr(e->rdma_sge.mr);
459 e->rdma_sge.mr = NULL;
460 }
461 }
462 }
463
464 /**
465 * qib_error_qp - put a QP into the error state
466 * @qp: the QP to put into the error state
467 * @err: the receive completion error to signal if a RWQE is active
468 *
469 * Flushes both send and receive work queues.
470 * Returns true if last WQE event should be generated.
471 * The QP r_lock and s_lock should be held and interrupts disabled.
472 * If we are already in error state, just return.
473 */
474 int qib_error_qp(struct qib_qp *qp, enum ib_wc_status err)
475 {
476 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
477 struct ib_wc wc;
478 int ret = 0;
479
480 if (qp->state == IB_QPS_ERR || qp->state == IB_QPS_RESET)
481 goto bail;
482
483 qp->state = IB_QPS_ERR;
484
485 if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
486 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
487 del_timer(&qp->s_timer);
488 }
489
490 if (qp->s_flags & QIB_S_ANY_WAIT_SEND)
491 qp->s_flags &= ~QIB_S_ANY_WAIT_SEND;
492
493 spin_lock(&dev->pending_lock);
494 if (!list_empty(&qp->iowait) && !(qp->s_flags & QIB_S_BUSY)) {
495 qp->s_flags &= ~QIB_S_ANY_WAIT_IO;
496 list_del_init(&qp->iowait);
497 }
498 spin_unlock(&dev->pending_lock);
499
500 if (!(qp->s_flags & QIB_S_BUSY)) {
501 qp->s_hdrwords = 0;
502 if (qp->s_rdma_mr) {
503 qib_put_mr(qp->s_rdma_mr);
504 qp->s_rdma_mr = NULL;
505 }
506 if (qp->s_tx) {
507 qib_put_txreq(qp->s_tx);
508 qp->s_tx = NULL;
509 }
510 }
511
512 /* Schedule the sending tasklet to drain the send work queue. */
513 if (qp->s_last != qp->s_head)
514 qib_schedule_send(qp);
515
516 clear_mr_refs(qp, 0);
517
518 memset(&wc, 0, sizeof(wc));
519 wc.qp = &qp->ibqp;
520 wc.opcode = IB_WC_RECV;
521
522 if (test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) {
523 wc.wr_id = qp->r_wr_id;
524 wc.status = err;
525 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
526 }
527 wc.status = IB_WC_WR_FLUSH_ERR;
528
529 if (qp->r_rq.wq) {
530 struct qib_rwq *wq;
531 u32 head;
532 u32 tail;
533
534 spin_lock(&qp->r_rq.lock);
535
536 /* sanity check pointers before trusting them */
537 wq = qp->r_rq.wq;
538 head = wq->head;
539 if (head >= qp->r_rq.size)
540 head = 0;
541 tail = wq->tail;
542 if (tail >= qp->r_rq.size)
543 tail = 0;
544 while (tail != head) {
545 wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id;
546 if (++tail >= qp->r_rq.size)
547 tail = 0;
548 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
549 }
550 wq->tail = tail;
551
552 spin_unlock(&qp->r_rq.lock);
553 } else if (qp->ibqp.event_handler)
554 ret = 1;
555
556 bail:
557 return ret;
558 }
559
560 /**
561 * qib_modify_qp - modify the attributes of a queue pair
562 * @ibqp: the queue pair who's attributes we're modifying
563 * @attr: the new attributes
564 * @attr_mask: the mask of attributes to modify
565 * @udata: user data for libibverbs.so
566 *
567 * Returns 0 on success, otherwise returns an errno.
568 */
569 int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
570 int attr_mask, struct ib_udata *udata)
571 {
572 struct qib_ibdev *dev = to_idev(ibqp->device);
573 struct qib_qp *qp = to_iqp(ibqp);
574 enum ib_qp_state cur_state, new_state;
575 struct ib_event ev;
576 int lastwqe = 0;
577 int mig = 0;
578 int ret;
579 u32 pmtu = 0; /* for gcc warning only */
580
581 spin_lock_irq(&qp->r_lock);
582 spin_lock(&qp->s_lock);
583
584 cur_state = attr_mask & IB_QP_CUR_STATE ?
585 attr->cur_qp_state : qp->state;
586 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
587
588 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
589 attr_mask, IB_LINK_LAYER_UNSPECIFIED))
590 goto inval;
591
592 if (attr_mask & IB_QP_AV) {
593 if (attr->ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
594 goto inval;
595 if (qib_check_ah(qp->ibqp.device, &attr->ah_attr))
596 goto inval;
597 }
598
599 if (attr_mask & IB_QP_ALT_PATH) {
600 if (attr->alt_ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
601 goto inval;
602 if (qib_check_ah(qp->ibqp.device, &attr->alt_ah_attr))
603 goto inval;
604 if (attr->alt_pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
605 goto inval;
606 }
607
608 if (attr_mask & IB_QP_PKEY_INDEX)
609 if (attr->pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
610 goto inval;
611
612 if (attr_mask & IB_QP_MIN_RNR_TIMER)
613 if (attr->min_rnr_timer > 31)
614 goto inval;
615
616 if (attr_mask & IB_QP_PORT)
617 if (qp->ibqp.qp_type == IB_QPT_SMI ||
618 qp->ibqp.qp_type == IB_QPT_GSI ||
619 attr->port_num == 0 ||
620 attr->port_num > ibqp->device->phys_port_cnt)
621 goto inval;
622
623 if (attr_mask & IB_QP_DEST_QPN)
624 if (attr->dest_qp_num > QIB_QPN_MASK)
625 goto inval;
626
627 if (attr_mask & IB_QP_RETRY_CNT)
628 if (attr->retry_cnt > 7)
629 goto inval;
630
631 if (attr_mask & IB_QP_RNR_RETRY)
632 if (attr->rnr_retry > 7)
633 goto inval;
634
635 /*
636 * Don't allow invalid path_mtu values. OK to set greater
637 * than the active mtu (or even the max_cap, if we have tuned
638 * that to a small mtu. We'll set qp->path_mtu
639 * to the lesser of requested attribute mtu and active,
640 * for packetizing messages.
641 * Note that the QP port has to be set in INIT and MTU in RTR.
642 */
643 if (attr_mask & IB_QP_PATH_MTU) {
644 struct qib_devdata *dd = dd_from_dev(dev);
645 int mtu, pidx = qp->port_num - 1;
646
647 mtu = ib_mtu_enum_to_int(attr->path_mtu);
648 if (mtu == -1)
649 goto inval;
650 if (mtu > dd->pport[pidx].ibmtu) {
651 switch (dd->pport[pidx].ibmtu) {
652 case 4096:
653 pmtu = IB_MTU_4096;
654 break;
655 case 2048:
656 pmtu = IB_MTU_2048;
657 break;
658 case 1024:
659 pmtu = IB_MTU_1024;
660 break;
661 case 512:
662 pmtu = IB_MTU_512;
663 break;
664 case 256:
665 pmtu = IB_MTU_256;
666 break;
667 default:
668 pmtu = IB_MTU_2048;
669 }
670 } else
671 pmtu = attr->path_mtu;
672 }
673
674 if (attr_mask & IB_QP_PATH_MIG_STATE) {
675 if (attr->path_mig_state == IB_MIG_REARM) {
676 if (qp->s_mig_state == IB_MIG_ARMED)
677 goto inval;
678 if (new_state != IB_QPS_RTS)
679 goto inval;
680 } else if (attr->path_mig_state == IB_MIG_MIGRATED) {
681 if (qp->s_mig_state == IB_MIG_REARM)
682 goto inval;
683 if (new_state != IB_QPS_RTS && new_state != IB_QPS_SQD)
684 goto inval;
685 if (qp->s_mig_state == IB_MIG_ARMED)
686 mig = 1;
687 } else
688 goto inval;
689 }
690
691 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
692 if (attr->max_dest_rd_atomic > QIB_MAX_RDMA_ATOMIC)
693 goto inval;
694
695 switch (new_state) {
696 case IB_QPS_RESET:
697 if (qp->state != IB_QPS_RESET) {
698 qp->state = IB_QPS_RESET;
699 spin_lock(&dev->pending_lock);
700 if (!list_empty(&qp->iowait))
701 list_del_init(&qp->iowait);
702 spin_unlock(&dev->pending_lock);
703 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
704 spin_unlock(&qp->s_lock);
705 spin_unlock_irq(&qp->r_lock);
706 /* Stop the sending work queue and retry timer */
707 cancel_work_sync(&qp->s_work);
708 del_timer_sync(&qp->s_timer);
709 wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
710 if (qp->s_tx) {
711 qib_put_txreq(qp->s_tx);
712 qp->s_tx = NULL;
713 }
714 remove_qp(dev, qp);
715 wait_event(qp->wait, !atomic_read(&qp->refcount));
716 spin_lock_irq(&qp->r_lock);
717 spin_lock(&qp->s_lock);
718 clear_mr_refs(qp, 1);
719 qib_reset_qp(qp, ibqp->qp_type);
720 }
721 break;
722
723 case IB_QPS_RTR:
724 /* Allow event to retrigger if QP set to RTR more than once */
725 qp->r_flags &= ~QIB_R_COMM_EST;
726 qp->state = new_state;
727 break;
728
729 case IB_QPS_SQD:
730 qp->s_draining = qp->s_last != qp->s_cur;
731 qp->state = new_state;
732 break;
733
734 case IB_QPS_SQE:
735 if (qp->ibqp.qp_type == IB_QPT_RC)
736 goto inval;
737 qp->state = new_state;
738 break;
739
740 case IB_QPS_ERR:
741 lastwqe = qib_error_qp(qp, IB_WC_WR_FLUSH_ERR);
742 break;
743
744 default:
745 qp->state = new_state;
746 break;
747 }
748
749 if (attr_mask & IB_QP_PKEY_INDEX)
750 qp->s_pkey_index = attr->pkey_index;
751
752 if (attr_mask & IB_QP_PORT)
753 qp->port_num = attr->port_num;
754
755 if (attr_mask & IB_QP_DEST_QPN)
756 qp->remote_qpn = attr->dest_qp_num;
757
758 if (attr_mask & IB_QP_SQ_PSN) {
759 qp->s_next_psn = attr->sq_psn & QIB_PSN_MASK;
760 qp->s_psn = qp->s_next_psn;
761 qp->s_sending_psn = qp->s_next_psn;
762 qp->s_last_psn = qp->s_next_psn - 1;
763 qp->s_sending_hpsn = qp->s_last_psn;
764 }
765
766 if (attr_mask & IB_QP_RQ_PSN)
767 qp->r_psn = attr->rq_psn & QIB_PSN_MASK;
768
769 if (attr_mask & IB_QP_ACCESS_FLAGS)
770 qp->qp_access_flags = attr->qp_access_flags;
771
772 if (attr_mask & IB_QP_AV) {
773 qp->remote_ah_attr = attr->ah_attr;
774 qp->s_srate = attr->ah_attr.static_rate;
775 }
776
777 if (attr_mask & IB_QP_ALT_PATH) {
778 qp->alt_ah_attr = attr->alt_ah_attr;
779 qp->s_alt_pkey_index = attr->alt_pkey_index;
780 }
781
782 if (attr_mask & IB_QP_PATH_MIG_STATE) {
783 qp->s_mig_state = attr->path_mig_state;
784 if (mig) {
785 qp->remote_ah_attr = qp->alt_ah_attr;
786 qp->port_num = qp->alt_ah_attr.port_num;
787 qp->s_pkey_index = qp->s_alt_pkey_index;
788 }
789 }
790
791 if (attr_mask & IB_QP_PATH_MTU) {
792 qp->path_mtu = pmtu;
793 qp->pmtu = ib_mtu_enum_to_int(pmtu);
794 }
795
796 if (attr_mask & IB_QP_RETRY_CNT) {
797 qp->s_retry_cnt = attr->retry_cnt;
798 qp->s_retry = attr->retry_cnt;
799 }
800
801 if (attr_mask & IB_QP_RNR_RETRY) {
802 qp->s_rnr_retry_cnt = attr->rnr_retry;
803 qp->s_rnr_retry = attr->rnr_retry;
804 }
805
806 if (attr_mask & IB_QP_MIN_RNR_TIMER)
807 qp->r_min_rnr_timer = attr->min_rnr_timer;
808
809 if (attr_mask & IB_QP_TIMEOUT) {
810 qp->timeout = attr->timeout;
811 qp->timeout_jiffies =
812 usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
813 1000UL);
814 }
815
816 if (attr_mask & IB_QP_QKEY)
817 qp->qkey = attr->qkey;
818
819 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
820 qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
821
822 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
823 qp->s_max_rd_atomic = attr->max_rd_atomic;
824
825 spin_unlock(&qp->s_lock);
826 spin_unlock_irq(&qp->r_lock);
827
828 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
829 insert_qp(dev, qp);
830
831 if (lastwqe) {
832 ev.device = qp->ibqp.device;
833 ev.element.qp = &qp->ibqp;
834 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
835 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
836 }
837 if (mig) {
838 ev.device = qp->ibqp.device;
839 ev.element.qp = &qp->ibqp;
840 ev.event = IB_EVENT_PATH_MIG;
841 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
842 }
843 ret = 0;
844 goto bail;
845
846 inval:
847 spin_unlock(&qp->s_lock);
848 spin_unlock_irq(&qp->r_lock);
849 ret = -EINVAL;
850
851 bail:
852 return ret;
853 }
854
855 int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
856 int attr_mask, struct ib_qp_init_attr *init_attr)
857 {
858 struct qib_qp *qp = to_iqp(ibqp);
859
860 attr->qp_state = qp->state;
861 attr->cur_qp_state = attr->qp_state;
862 attr->path_mtu = qp->path_mtu;
863 attr->path_mig_state = qp->s_mig_state;
864 attr->qkey = qp->qkey;
865 attr->rq_psn = qp->r_psn & QIB_PSN_MASK;
866 attr->sq_psn = qp->s_next_psn & QIB_PSN_MASK;
867 attr->dest_qp_num = qp->remote_qpn;
868 attr->qp_access_flags = qp->qp_access_flags;
869 attr->cap.max_send_wr = qp->s_size - 1;
870 attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1;
871 attr->cap.max_send_sge = qp->s_max_sge;
872 attr->cap.max_recv_sge = qp->r_rq.max_sge;
873 attr->cap.max_inline_data = 0;
874 attr->ah_attr = qp->remote_ah_attr;
875 attr->alt_ah_attr = qp->alt_ah_attr;
876 attr->pkey_index = qp->s_pkey_index;
877 attr->alt_pkey_index = qp->s_alt_pkey_index;
878 attr->en_sqd_async_notify = 0;
879 attr->sq_draining = qp->s_draining;
880 attr->max_rd_atomic = qp->s_max_rd_atomic;
881 attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
882 attr->min_rnr_timer = qp->r_min_rnr_timer;
883 attr->port_num = qp->port_num;
884 attr->timeout = qp->timeout;
885 attr->retry_cnt = qp->s_retry_cnt;
886 attr->rnr_retry = qp->s_rnr_retry_cnt;
887 attr->alt_port_num = qp->alt_ah_attr.port_num;
888 attr->alt_timeout = qp->alt_timeout;
889
890 init_attr->event_handler = qp->ibqp.event_handler;
891 init_attr->qp_context = qp->ibqp.qp_context;
892 init_attr->send_cq = qp->ibqp.send_cq;
893 init_attr->recv_cq = qp->ibqp.recv_cq;
894 init_attr->srq = qp->ibqp.srq;
895 init_attr->cap = attr->cap;
896 if (qp->s_flags & QIB_S_SIGNAL_REQ_WR)
897 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
898 else
899 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
900 init_attr->qp_type = qp->ibqp.qp_type;
901 init_attr->port_num = qp->port_num;
902 return 0;
903 }
904
905 /**
906 * qib_compute_aeth - compute the AETH (syndrome + MSN)
907 * @qp: the queue pair to compute the AETH for
908 *
909 * Returns the AETH.
910 */
911 __be32 qib_compute_aeth(struct qib_qp *qp)
912 {
913 u32 aeth = qp->r_msn & QIB_MSN_MASK;
914
915 if (qp->ibqp.srq) {
916 /*
917 * Shared receive queues don't generate credits.
918 * Set the credit field to the invalid value.
919 */
920 aeth |= QIB_AETH_CREDIT_INVAL << QIB_AETH_CREDIT_SHIFT;
921 } else {
922 u32 min, max, x;
923 u32 credits;
924 struct qib_rwq *wq = qp->r_rq.wq;
925 u32 head;
926 u32 tail;
927
928 /* sanity check pointers before trusting them */
929 head = wq->head;
930 if (head >= qp->r_rq.size)
931 head = 0;
932 tail = wq->tail;
933 if (tail >= qp->r_rq.size)
934 tail = 0;
935 /*
936 * Compute the number of credits available (RWQEs).
937 * XXX Not holding the r_rq.lock here so there is a small
938 * chance that the pair of reads are not atomic.
939 */
940 credits = head - tail;
941 if ((int)credits < 0)
942 credits += qp->r_rq.size;
943 /*
944 * Binary search the credit table to find the code to
945 * use.
946 */
947 min = 0;
948 max = 31;
949 for (;;) {
950 x = (min + max) / 2;
951 if (credit_table[x] == credits)
952 break;
953 if (credit_table[x] > credits)
954 max = x;
955 else if (min == x)
956 break;
957 else
958 min = x;
959 }
960 aeth |= x << QIB_AETH_CREDIT_SHIFT;
961 }
962 return cpu_to_be32(aeth);
963 }
964
965 /**
966 * qib_create_qp - create a queue pair for a device
967 * @ibpd: the protection domain who's device we create the queue pair for
968 * @init_attr: the attributes of the queue pair
969 * @udata: user data for libibverbs.so
970 *
971 * Returns the queue pair on success, otherwise returns an errno.
972 *
973 * Called by the ib_create_qp() core verbs function.
974 */
975 struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
976 struct ib_qp_init_attr *init_attr,
977 struct ib_udata *udata)
978 {
979 struct qib_qp *qp;
980 int err;
981 struct qib_swqe *swq = NULL;
982 struct qib_ibdev *dev;
983 struct qib_devdata *dd;
984 size_t sz;
985 size_t sg_list_sz;
986 struct ib_qp *ret;
987 gfp_t gfp;
988
989
990 if (init_attr->cap.max_send_sge > ib_qib_max_sges ||
991 init_attr->cap.max_send_wr > ib_qib_max_qp_wrs ||
992 init_attr->create_flags & ~(IB_QP_CREATE_USE_GFP_NOIO))
993 return ERR_PTR(-EINVAL);
994
995 /* GFP_NOIO is applicable in RC QPs only */
996 if (init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO &&
997 init_attr->qp_type != IB_QPT_RC)
998 return ERR_PTR(-EINVAL);
999
1000 gfp = init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO ?
1001 GFP_NOIO : GFP_KERNEL;
1002
1003 /* Check receive queue parameters if no SRQ is specified. */
1004 if (!init_attr->srq) {
1005 if (init_attr->cap.max_recv_sge > ib_qib_max_sges ||
1006 init_attr->cap.max_recv_wr > ib_qib_max_qp_wrs) {
1007 ret = ERR_PTR(-EINVAL);
1008 goto bail;
1009 }
1010 if (init_attr->cap.max_send_sge +
1011 init_attr->cap.max_send_wr +
1012 init_attr->cap.max_recv_sge +
1013 init_attr->cap.max_recv_wr == 0) {
1014 ret = ERR_PTR(-EINVAL);
1015 goto bail;
1016 }
1017 }
1018
1019 switch (init_attr->qp_type) {
1020 case IB_QPT_SMI:
1021 case IB_QPT_GSI:
1022 if (init_attr->port_num == 0 ||
1023 init_attr->port_num > ibpd->device->phys_port_cnt) {
1024 ret = ERR_PTR(-EINVAL);
1025 goto bail;
1026 }
1027 case IB_QPT_UC:
1028 case IB_QPT_RC:
1029 case IB_QPT_UD:
1030 sz = sizeof(struct qib_sge) *
1031 init_attr->cap.max_send_sge +
1032 sizeof(struct qib_swqe);
1033 swq = __vmalloc((init_attr->cap.max_send_wr + 1) * sz,
1034 gfp, PAGE_KERNEL);
1035 if (swq == NULL) {
1036 ret = ERR_PTR(-ENOMEM);
1037 goto bail;
1038 }
1039 sz = sizeof(*qp);
1040 sg_list_sz = 0;
1041 if (init_attr->srq) {
1042 struct qib_srq *srq = to_isrq(init_attr->srq);
1043
1044 if (srq->rq.max_sge > 1)
1045 sg_list_sz = sizeof(*qp->r_sg_list) *
1046 (srq->rq.max_sge - 1);
1047 } else if (init_attr->cap.max_recv_sge > 1)
1048 sg_list_sz = sizeof(*qp->r_sg_list) *
1049 (init_attr->cap.max_recv_sge - 1);
1050 qp = kzalloc(sz + sg_list_sz, gfp);
1051 if (!qp) {
1052 ret = ERR_PTR(-ENOMEM);
1053 goto bail_swq;
1054 }
1055 RCU_INIT_POINTER(qp->next, NULL);
1056 qp->s_hdr = kzalloc(sizeof(*qp->s_hdr), gfp);
1057 if (!qp->s_hdr) {
1058 ret = ERR_PTR(-ENOMEM);
1059 goto bail_qp;
1060 }
1061 qp->timeout_jiffies =
1062 usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
1063 1000UL);
1064 if (init_attr->srq)
1065 sz = 0;
1066 else {
1067 qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
1068 qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
1069 sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
1070 sizeof(struct qib_rwqe);
1071 if (gfp != GFP_NOIO)
1072 qp->r_rq.wq = vmalloc_user(
1073 sizeof(struct qib_rwq) +
1074 qp->r_rq.size * sz);
1075 else
1076 qp->r_rq.wq = __vmalloc(
1077 sizeof(struct qib_rwq) +
1078 qp->r_rq.size * sz,
1079 gfp, PAGE_KERNEL);
1080
1081 if (!qp->r_rq.wq) {
1082 ret = ERR_PTR(-ENOMEM);
1083 goto bail_qp;
1084 }
1085 }
1086
1087 /*
1088 * ib_create_qp() will initialize qp->ibqp
1089 * except for qp->ibqp.qp_num.
1090 */
1091 spin_lock_init(&qp->r_lock);
1092 spin_lock_init(&qp->s_lock);
1093 spin_lock_init(&qp->r_rq.lock);
1094 atomic_set(&qp->refcount, 0);
1095 init_waitqueue_head(&qp->wait);
1096 init_waitqueue_head(&qp->wait_dma);
1097 init_timer(&qp->s_timer);
1098 qp->s_timer.data = (unsigned long)qp;
1099 INIT_WORK(&qp->s_work, qib_do_send);
1100 INIT_LIST_HEAD(&qp->iowait);
1101 INIT_LIST_HEAD(&qp->rspwait);
1102 qp->state = IB_QPS_RESET;
1103 qp->s_wq = swq;
1104 qp->s_size = init_attr->cap.max_send_wr + 1;
1105 qp->s_max_sge = init_attr->cap.max_send_sge;
1106 if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
1107 qp->s_flags = QIB_S_SIGNAL_REQ_WR;
1108 dev = to_idev(ibpd->device);
1109 dd = dd_from_dev(dev);
1110 err = alloc_qpn(dd, &dev->qpn_table, init_attr->qp_type,
1111 init_attr->port_num, gfp);
1112 if (err < 0) {
1113 ret = ERR_PTR(err);
1114 vfree(qp->r_rq.wq);
1115 goto bail_qp;
1116 }
1117 qp->ibqp.qp_num = err;
1118 qp->port_num = init_attr->port_num;
1119 qib_reset_qp(qp, init_attr->qp_type);
1120 break;
1121
1122 default:
1123 /* Don't support raw QPs */
1124 ret = ERR_PTR(-ENOSYS);
1125 goto bail;
1126 }
1127
1128 init_attr->cap.max_inline_data = 0;
1129
1130 /*
1131 * Return the address of the RWQ as the offset to mmap.
1132 * See qib_mmap() for details.
1133 */
1134 if (udata && udata->outlen >= sizeof(__u64)) {
1135 if (!qp->r_rq.wq) {
1136 __u64 offset = 0;
1137
1138 err = ib_copy_to_udata(udata, &offset,
1139 sizeof(offset));
1140 if (err) {
1141 ret = ERR_PTR(err);
1142 goto bail_ip;
1143 }
1144 } else {
1145 u32 s = sizeof(struct qib_rwq) + qp->r_rq.size * sz;
1146
1147 qp->ip = qib_create_mmap_info(dev, s,
1148 ibpd->uobject->context,
1149 qp->r_rq.wq);
1150 if (!qp->ip) {
1151 ret = ERR_PTR(-ENOMEM);
1152 goto bail_ip;
1153 }
1154
1155 err = ib_copy_to_udata(udata, &(qp->ip->offset),
1156 sizeof(qp->ip->offset));
1157 if (err) {
1158 ret = ERR_PTR(err);
1159 goto bail_ip;
1160 }
1161 }
1162 }
1163
1164 spin_lock(&dev->n_qps_lock);
1165 if (dev->n_qps_allocated == ib_qib_max_qps) {
1166 spin_unlock(&dev->n_qps_lock);
1167 ret = ERR_PTR(-ENOMEM);
1168 goto bail_ip;
1169 }
1170
1171 dev->n_qps_allocated++;
1172 spin_unlock(&dev->n_qps_lock);
1173
1174 if (qp->ip) {
1175 spin_lock_irq(&dev->pending_lock);
1176 list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps);
1177 spin_unlock_irq(&dev->pending_lock);
1178 }
1179
1180 ret = &qp->ibqp;
1181 goto bail;
1182
1183 bail_ip:
1184 if (qp->ip)
1185 kref_put(&qp->ip->ref, qib_release_mmap_info);
1186 else
1187 vfree(qp->r_rq.wq);
1188 free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
1189 bail_qp:
1190 kfree(qp->s_hdr);
1191 kfree(qp);
1192 bail_swq:
1193 vfree(swq);
1194 bail:
1195 return ret;
1196 }
1197
1198 /**
1199 * qib_destroy_qp - destroy a queue pair
1200 * @ibqp: the queue pair to destroy
1201 *
1202 * Returns 0 on success.
1203 *
1204 * Note that this can be called while the QP is actively sending or
1205 * receiving!
1206 */
1207 int qib_destroy_qp(struct ib_qp *ibqp)
1208 {
1209 struct qib_qp *qp = to_iqp(ibqp);
1210 struct qib_ibdev *dev = to_idev(ibqp->device);
1211
1212 /* Make sure HW and driver activity is stopped. */
1213 spin_lock_irq(&qp->s_lock);
1214 if (qp->state != IB_QPS_RESET) {
1215 qp->state = IB_QPS_RESET;
1216 spin_lock(&dev->pending_lock);
1217 if (!list_empty(&qp->iowait))
1218 list_del_init(&qp->iowait);
1219 spin_unlock(&dev->pending_lock);
1220 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
1221 spin_unlock_irq(&qp->s_lock);
1222 cancel_work_sync(&qp->s_work);
1223 del_timer_sync(&qp->s_timer);
1224 wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
1225 if (qp->s_tx) {
1226 qib_put_txreq(qp->s_tx);
1227 qp->s_tx = NULL;
1228 }
1229 remove_qp(dev, qp);
1230 wait_event(qp->wait, !atomic_read(&qp->refcount));
1231 clear_mr_refs(qp, 1);
1232 } else
1233 spin_unlock_irq(&qp->s_lock);
1234
1235 /* all user's cleaned up, mark it available */
1236 free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
1237 spin_lock(&dev->n_qps_lock);
1238 dev->n_qps_allocated--;
1239 spin_unlock(&dev->n_qps_lock);
1240
1241 if (qp->ip)
1242 kref_put(&qp->ip->ref, qib_release_mmap_info);
1243 else
1244 vfree(qp->r_rq.wq);
1245 vfree(qp->s_wq);
1246 kfree(qp->s_hdr);
1247 kfree(qp);
1248 return 0;
1249 }
1250
1251 /**
1252 * qib_init_qpn_table - initialize the QP number table for a device
1253 * @qpt: the QPN table
1254 */
1255 void qib_init_qpn_table(struct qib_devdata *dd, struct qib_qpn_table *qpt)
1256 {
1257 spin_lock_init(&qpt->lock);
1258 qpt->last = 1; /* start with QPN 2 */
1259 qpt->nmaps = 1;
1260 qpt->mask = dd->qpn_mask;
1261 }
1262
1263 /**
1264 * qib_free_qpn_table - free the QP number table for a device
1265 * @qpt: the QPN table
1266 */
1267 void qib_free_qpn_table(struct qib_qpn_table *qpt)
1268 {
1269 int i;
1270
1271 for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
1272 if (qpt->map[i].page)
1273 free_page((unsigned long) qpt->map[i].page);
1274 }
1275
1276 /**
1277 * qib_get_credit - flush the send work queue of a QP
1278 * @qp: the qp who's send work queue to flush
1279 * @aeth: the Acknowledge Extended Transport Header
1280 *
1281 * The QP s_lock should be held.
1282 */
1283 void qib_get_credit(struct qib_qp *qp, u32 aeth)
1284 {
1285 u32 credit = (aeth >> QIB_AETH_CREDIT_SHIFT) & QIB_AETH_CREDIT_MASK;
1286
1287 /*
1288 * If the credit is invalid, we can send
1289 * as many packets as we like. Otherwise, we have to
1290 * honor the credit field.
1291 */
1292 if (credit == QIB_AETH_CREDIT_INVAL) {
1293 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
1294 qp->s_flags |= QIB_S_UNLIMITED_CREDIT;
1295 if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
1296 qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
1297 qib_schedule_send(qp);
1298 }
1299 }
1300 } else if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
1301 /* Compute new LSN (i.e., MSN + credit) */
1302 credit = (aeth + credit_table[credit]) & QIB_MSN_MASK;
1303 if (qib_cmp24(credit, qp->s_lsn) > 0) {
1304 qp->s_lsn = credit;
1305 if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
1306 qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
1307 qib_schedule_send(qp);
1308 }
1309 }
1310 }
1311 }
1312
1313 #ifdef CONFIG_DEBUG_FS
1314
1315 struct qib_qp_iter {
1316 struct qib_ibdev *dev;
1317 struct qib_qp *qp;
1318 int n;
1319 };
1320
1321 struct qib_qp_iter *qib_qp_iter_init(struct qib_ibdev *dev)
1322 {
1323 struct qib_qp_iter *iter;
1324
1325 iter = kzalloc(sizeof(*iter), GFP_KERNEL);
1326 if (!iter)
1327 return NULL;
1328
1329 iter->dev = dev;
1330 if (qib_qp_iter_next(iter)) {
1331 kfree(iter);
1332 return NULL;
1333 }
1334
1335 return iter;
1336 }
1337
1338 int qib_qp_iter_next(struct qib_qp_iter *iter)
1339 {
1340 struct qib_ibdev *dev = iter->dev;
1341 int n = iter->n;
1342 int ret = 1;
1343 struct qib_qp *pqp = iter->qp;
1344 struct qib_qp *qp;
1345
1346 for (; n < dev->qp_table_size; n++) {
1347 if (pqp)
1348 qp = rcu_dereference(pqp->next);
1349 else
1350 qp = rcu_dereference(dev->qp_table[n]);
1351 pqp = qp;
1352 if (qp) {
1353 iter->qp = qp;
1354 iter->n = n;
1355 return 0;
1356 }
1357 }
1358 return ret;
1359 }
1360
1361 static const char * const qp_type_str[] = {
1362 "SMI", "GSI", "RC", "UC", "UD",
1363 };
1364
1365 void qib_qp_iter_print(struct seq_file *s, struct qib_qp_iter *iter)
1366 {
1367 struct qib_swqe *wqe;
1368 struct qib_qp *qp = iter->qp;
1369
1370 wqe = get_swqe_ptr(qp, qp->s_last);
1371 seq_printf(s,
1372 "N %d QP%u %s %u %u %u f=%x %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u) QP%u LID %x\n",
1373 iter->n,
1374 qp->ibqp.qp_num,
1375 qp_type_str[qp->ibqp.qp_type],
1376 qp->state,
1377 wqe->wr.opcode,
1378 qp->s_hdrwords,
1379 qp->s_flags,
1380 atomic_read(&qp->s_dma_busy),
1381 !list_empty(&qp->iowait),
1382 qp->timeout,
1383 wqe->ssn,
1384 qp->s_lsn,
1385 qp->s_last_psn,
1386 qp->s_psn, qp->s_next_psn,
1387 qp->s_sending_psn, qp->s_sending_hpsn,
1388 qp->s_last, qp->s_acked, qp->s_cur,
1389 qp->s_tail, qp->s_head, qp->s_size,
1390 qp->remote_qpn,
1391 qp->remote_ah_attr.dlid);
1392 }
1393
1394 #endif
Linux kernel - Deliverables
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