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IB/qib: Remove ibport and use rdmavt version
[deliverable/linux.git] / drivers / infiniband / hw / qib / qib_qp.c
CommitLineData
f931551b 1/*
f7cf9a61 2 * Copyright (c) 2012, 2013 Intel Corporation. All rights reserved.
1fb9fed6 3 * Copyright (c) 2006 - 2012 QLogic Corporation. * All rights reserved.
f931551b
RC		 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>
af061a64 37#include <linux/jhash.h>
869a2a96 38#include <rdma/rdma_vt.h>
1dd173b0
MM		 39#ifdef CONFIG_DEBUG_FS
40#include <linux/seq_file.h>
41#endif
f931551b
RC		 42
43#include "qib.h"
44
45#define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
46#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
47
48static inline unsigned mk_qpn(struct qib_qpn_table *qpt,
49 struct qpn_map *map, unsigned off)
50{
51 return (map - qpt->map) * BITS_PER_PAGE + off;
52}
53
54static inline unsigned find_next_offset(struct qib_qpn_table *qpt,
55 struct qpn_map *map, unsigned off,
2528ea60 56 unsigned n)
f931551b
RC		 57{
58 if (qpt->mask) {
59 off++;
2528ea60
MM		 60 if (((off & qpt->mask) >> 1) >= n)
61 off = (off | qpt->mask) + 2;
f931551b
RC		 62 } else
63 off = find_next_zero_bit(map->page, BITS_PER_PAGE, off);
64 return off;
65}
66
67/*
68 * Convert the AETH credit code into the number of credits.
69 */
70static u32 credit_table[31] = {
71 0, /* 0 */
72 1, /* 1 */
73 2, /* 2 */
74 3, /* 3 */
75 4, /* 4 */
76 6, /* 5 */
77 8, /* 6 */
78 12, /* 7 */
79 16, /* 8 */
80 24, /* 9 */
81 32, /* A */
82 48, /* B */
83 64, /* C */
84 96, /* D */
85 128, /* E */
86 192, /* F */
87 256, /* 10 */
88 384, /* 11 */
89 512, /* 12 */
90 768, /* 13 */
91 1024, /* 14 */
92 1536, /* 15 */
93 2048, /* 16 */
94 3072, /* 17 */
95 4096, /* 18 */
96 6144, /* 19 */
97 8192, /* 1A */
98 12288, /* 1B */
99 16384, /* 1C */
100 24576, /* 1D */
101 32768 /* 1E */
102};
103
fbbeb863
VA		 104static void get_map_page(struct qib_qpn_table *qpt, struct qpn_map *map,
105 gfp_t gfp)
f931551b 106{
fbbeb863 107 unsigned long page = get_zeroed_page(gfp);
f931551b
RC		 108
109 /*
110 * Free the page if someone raced with us installing it.
111 */
112
113 spin_lock(&qpt->lock);
114 if (map->page)
115 free_page(page);
116 else
117 map->page = (void *)page;
118 spin_unlock(&qpt->lock);
119}
120
121/*
122 * Allocate the next available QPN or
123 * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
124 */
125static int alloc_qpn(struct qib_devdata *dd, struct qib_qpn_table *qpt,
fbbeb863 126 enum ib_qp_type type, u8 port, gfp_t gfp)
f931551b
RC		 127{
128 u32 i, offset, max_scan, qpn;
129 struct qpn_map *map;
130 u32 ret;
f931551b
RC		 131
132 if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
133 unsigned n;
134
135 ret = type == IB_QPT_GSI;
136 n = 1 << (ret + 2 * (port - 1));
137 spin_lock(&qpt->lock);
138 if (qpt->flags & n)
139 ret = -EINVAL;
140 else
141 qpt->flags |= n;
142 spin_unlock(&qpt->lock);
143 goto bail;
144 }
145
7c3edd3f 146 qpn = qpt->last + 2;
f931551b
RC		 147 if (qpn >= QPN_MAX)
148 qpn = 2;
2528ea60
MM		 149 if (qpt->mask && ((qpn & qpt->mask) >> 1) >= dd->n_krcv_queues)
150 qpn = (qpn | qpt->mask) + 2;
f931551b
RC		 151 offset = qpn & BITS_PER_PAGE_MASK;
152 map = &qpt->map[qpn / BITS_PER_PAGE];
153 max_scan = qpt->nmaps - !offset;
154 for (i = 0;;) {
155 if (unlikely(!map->page)) {
fbbeb863 156 get_map_page(qpt, map, gfp);
f931551b
RC		 157 if (unlikely(!map->page))
158 break;
159 }
160 do {
161 if (!test_and_set_bit(offset, map->page)) {
162 qpt->last = qpn;
163 ret = qpn;
164 goto bail;
165 }
2528ea60
MM		 166 offset = find_next_offset(qpt, map, offset,
167 dd->n_krcv_queues);
f931551b
RC		 168 qpn = mk_qpn(qpt, map, offset);
169 /*
170 * This test differs from alloc_pidmap().
171 * If find_next_offset() does find a zero
172 * bit, we don't need to check for QPN
173 * wrapping around past our starting QPN.
174 * We just need to be sure we don't loop
175 * forever.
176 */
177 } while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
178 /*
179 * In order to keep the number of pages allocated to a
180 * minimum, we scan the all existing pages before increasing
181 * the size of the bitmap table.
182 */
183 if (++i > max_scan) {
184 if (qpt->nmaps == QPNMAP_ENTRIES)
185 break;
186 map = &qpt->map[qpt->nmaps++];
2528ea60 187 offset = 0;
f931551b
RC		 188 } else if (map < &qpt->map[qpt->nmaps]) {
189 ++map;
2528ea60 190 offset = 0;
f931551b
RC		 191 } else {
192 map = &qpt->map[0];
2528ea60 193 offset = 2;
f931551b
RC		 194 }
195 qpn = mk_qpn(qpt, map, offset);
196 }
197
198 ret = -ENOMEM;
199
200bail:
201 return ret;
202}
203
204static void free_qpn(struct qib_qpn_table *qpt, u32 qpn)
205{
206 struct qpn_map *map;
207
208 map = qpt->map + qpn / BITS_PER_PAGE;
209 if (map->page)
210 clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
211}
212
af061a64
MM		 213static inline unsigned qpn_hash(struct qib_ibdev *dev, u32 qpn)
214{
215 return jhash_1word(qpn, dev->qp_rnd) &
216 (dev->qp_table_size - 1);
217}
218
219
f931551b
RC		 220/*
221 * Put the QP into the hash table.
222 * The hash table holds a reference to the QP.
223 */
7c2e11fe 224static void insert_qp(struct qib_ibdev *dev, struct rvt_qp *qp)
f931551b
RC		 225{
226 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
f931551b 227 unsigned long flags;
af061a64 228 unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
f931551b 229
af061a64 230 atomic_inc(&qp->refcount);
f7cf9a61 231 spin_lock_irqsave(&dev->qpt_lock, flags);
f931551b
RC		 232
233 if (qp->ibqp.qp_num == 0)
f24a6d48 234 rcu_assign_pointer(ibp->rvp.qp[0], qp);
f931551b 235 else if (qp->ibqp.qp_num == 1)
f24a6d48 236 rcu_assign_pointer(ibp->rvp.qp[1], qp);
f931551b
RC		 237 else {
238 qp->next = dev->qp_table[n];
af061a64 239 rcu_assign_pointer(dev->qp_table[n], qp);
f931551b 240 }
f931551b
RC		 241
242 spin_unlock_irqrestore(&dev->qpt_lock, flags);
243}
244
245/*
246 * Remove the QP from the table so it can't be found asynchronously by
247 * the receive interrupt routine.
248 */
7c2e11fe 249static void remove_qp(struct qib_ibdev *dev, struct rvt_qp *qp)
f931551b
RC		 250{
251 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
af061a64 252 unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
f931551b 253 unsigned long flags;
f7cf9a61 254 int removed = 1;
f931551b 255
f931551b
RC		 256 spin_lock_irqsave(&dev->qpt_lock, flags);
257
f24a6d48
HC		 258 if (rcu_dereference_protected(ibp->rvp.qp[0],
259 lockdep_is_held(&dev->qpt_lock)) == qp) {
260 RCU_INIT_POINTER(ibp->rvp.qp[0], NULL);
261 } else if (rcu_dereference_protected(ibp->rvp.qp[1],
1fb9fed6 262 lockdep_is_held(&dev->qpt_lock)) == qp) {
f24a6d48 263 RCU_INIT_POINTER(ibp->rvp.qp[1], NULL);
af061a64 264 } else {
7c2e11fe
DD		 265 struct rvt_qp *q;
266 struct rvt_qp __rcu **qpp;
af061a64 267
f7cf9a61 268 removed = 0;
af061a64 269 qpp = &dev->qp_table[n];
d359f354
MM		 270 for (; (q = rcu_dereference_protected(*qpp,
271 lockdep_is_held(&dev->qpt_lock))) != NULL;
272 qpp = &q->next)
f931551b 273 if (q == qp) {
03c88591 274 RCU_INIT_POINTER(*qpp,
bcc9b67a
MM		 275 rcu_dereference_protected(qp->next,
276 lockdep_is_held(&dev->qpt_lock)));
f7cf9a61 277 removed = 1;
f931551b
RC		 278 break;
279 }
af061a64 280 }
f931551b
RC		 281
282 spin_unlock_irqrestore(&dev->qpt_lock, flags);
f7cf9a61
MM		 283 if (removed) {
284 synchronize_rcu();
285 atomic_dec(&qp->refcount);
286 }
f931551b
RC		 287}
288
289/**
290 * qib_free_all_qps - check for QPs still in use
291 * @qpt: the QP table to empty
292 *
293 * There should not be any QPs still in use.
294 * Free memory for table.
295 */
296unsigned qib_free_all_qps(struct qib_devdata *dd)
297{
298 struct qib_ibdev *dev = &dd->verbs_dev;
299 unsigned long flags;
7c2e11fe 300 struct rvt_qp *qp;
f931551b
RC		 301 unsigned n, qp_inuse = 0;
302
303 for (n = 0; n < dd->num_pports; n++) {
304 struct qib_ibport *ibp = &dd->pport[n].ibport_data;
305
306 if (!qib_mcast_tree_empty(ibp))
307 qp_inuse++;
af061a64 308 rcu_read_lock();
f24a6d48 309 if (rcu_dereference(ibp->rvp.qp[0]))
f931551b 310 qp_inuse++;
f24a6d48 311 if (rcu_dereference(ibp->rvp.qp[1]))
f931551b 312 qp_inuse++;
af061a64 313 rcu_read_unlock();
f931551b
RC		 314 }
315
316 spin_lock_irqsave(&dev->qpt_lock, flags);
317 for (n = 0; n < dev->qp_table_size; n++) {
1fb9fed6
MM		 318 qp = rcu_dereference_protected(dev->qp_table[n],
319 lockdep_is_held(&dev->qpt_lock));
03c88591 320 RCU_INIT_POINTER(dev->qp_table[n], NULL);
f931551b 321
1fb9fed6
MM		 322 for (; qp; qp = rcu_dereference_protected(qp->next,
323 lockdep_is_held(&dev->qpt_lock)))
f931551b
RC		 324 qp_inuse++;
325 }
326 spin_unlock_irqrestore(&dev->qpt_lock, flags);
af061a64 327 synchronize_rcu();
f931551b
RC		 328
329 return qp_inuse;
330}
331
332/**
333 * qib_lookup_qpn - return the QP with the given QPN
334 * @qpt: the QP table
335 * @qpn: the QP number to look up
336 *
337 * The caller is responsible for decrementing the QP reference count
338 * when done.
339 */
7c2e11fe 340struct rvt_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
f931551b 341{
7c2e11fe 342 struct rvt_qp *qp = NULL;
f931551b 343
f7cf9a61 344 rcu_read_lock();
af061a64 345 if (unlikely(qpn <= 1)) {
af061a64 346 if (qpn == 0)
f24a6d48 347 qp = rcu_dereference(ibp->rvp.qp[0]);
af061a64 348 else
f24a6d48 349 qp = rcu_dereference(ibp->rvp.qp[1]);
f7cf9a61
MM		 350 if (qp)
351 atomic_inc(&qp->refcount);
af061a64
MM		 352 } else {
353 struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
354 unsigned n = qpn_hash(dev, qpn);
f931551b 355
1fb9fed6
MM		 356 for (qp = rcu_dereference(dev->qp_table[n]); qp;
357 qp = rcu_dereference(qp->next))
f7cf9a61
MM		 358 if (qp->ibqp.qp_num == qpn) {
359 atomic_inc(&qp->refcount);
f931551b 360 break;
f7cf9a61 361 }
af061a64 362 }
af061a64 363 rcu_read_unlock();
f931551b
RC		 364 return qp;
365}
366
367/**
368 * qib_reset_qp - initialize the QP state to the reset state
369 * @qp: the QP to reset
370 * @type: the QP type
371 */
7c2e11fe 372static void qib_reset_qp(struct rvt_qp *qp, enum ib_qp_type type)
f931551b 373{
ffc26907 374 struct qib_qp_priv *priv = qp->priv;
f931551b
RC		 375 qp->remote_qpn = 0;
376 qp->qkey = 0;
377 qp->qp_access_flags = 0;
ffc26907 378 atomic_set(&priv->s_dma_busy, 0);
f931551b
RC		 379 qp->s_flags &= QIB_S_SIGNAL_REQ_WR;
380 qp->s_hdrwords = 0;
381 qp->s_wqe = NULL;
382 qp->s_draining = 0;
383 qp->s_next_psn = 0;
384 qp->s_last_psn = 0;
385 qp->s_sending_psn = 0;
386 qp->s_sending_hpsn = 0;
387 qp->s_psn = 0;
388 qp->r_psn = 0;
389 qp->r_msn = 0;
390 if (type == IB_QPT_RC) {
391 qp->s_state = IB_OPCODE_RC_SEND_LAST;
392 qp->r_state = IB_OPCODE_RC_SEND_LAST;
393 } else {
394 qp->s_state = IB_OPCODE_UC_SEND_LAST;
395 qp->r_state = IB_OPCODE_UC_SEND_LAST;
396 }
397 qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
398 qp->r_nak_state = 0;
399 qp->r_aflags = 0;
400 qp->r_flags = 0;
401 qp->s_head = 0;
402 qp->s_tail = 0;
403 qp->s_cur = 0;
404 qp->s_acked = 0;
405 qp->s_last = 0;
406 qp->s_ssn = 1;
407 qp->s_lsn = 0;
408 qp->s_mig_state = IB_MIG_MIGRATED;
409 memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
410 qp->r_head_ack_queue = 0;
411 qp->s_tail_ack_queue = 0;
412 qp->s_num_rd_atomic = 0;
413 if (qp->r_rq.wq) {
414 qp->r_rq.wq->head = 0;
415 qp->r_rq.wq->tail = 0;
416 }
417 qp->r_sge.num_sge = 0;
418}
419
7c2e11fe 420static void clear_mr_refs(struct rvt_qp *qp, int clr_sends)
f931551b
RC		 421{
422 unsigned n;
423
424 if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
6a82649f 425 qib_put_ss(&qp->s_rdma_read_sge);
f931551b 426
6a82649f 427 qib_put_ss(&qp->r_sge);
f931551b
RC		 428
429 if (clr_sends) {
430 while (qp->s_last != qp->s_head) {
7c2e11fe 431 struct rvt_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
f931551b
RC		 432 unsigned i;
433
434 for (i = 0; i < wqe->wr.num_sge; i++) {
7c2e11fe 435 struct rvt_sge *sge = &wqe->sg_list[i];
f931551b 436
7c2e11fe 437 rvt_put_mr(sge->mr);
f931551b
RC		 438 }
439 if (qp->ibqp.qp_type == IB_QPT_UD ||
440 qp->ibqp.qp_type == IB_QPT_SMI ||
441 qp->ibqp.qp_type == IB_QPT_GSI)
96ab1ac1
DD		 442 atomic_dec(
443 &ibah_to_rvtah(wqe->ud_wr.ah)->refcount);
f931551b
RC		 444 if (++qp->s_last >= qp->s_size)
445 qp->s_last = 0;
446 }
447 if (qp->s_rdma_mr) {
7c2e11fe 448 rvt_put_mr(qp->s_rdma_mr);
f931551b
RC		 449 qp->s_rdma_mr = NULL;
450 }
451 }
452
453 if (qp->ibqp.qp_type != IB_QPT_RC)
454 return;
455
456 for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) {
7c2e11fe 457 struct rvt_ack_entry *e = &qp->s_ack_queue[n];
f931551b
RC		 458
459 if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST &&
460 e->rdma_sge.mr) {
7c2e11fe 461 rvt_put_mr(e->rdma_sge.mr);
f931551b
RC		 462 e->rdma_sge.mr = NULL;
463 }
464 }
465}
466
467/**
468 * qib_error_qp - put a QP into the error state
469 * @qp: the QP to put into the error state
470 * @err: the receive completion error to signal if a RWQE is active
471 *
472 * Flushes both send and receive work queues.
473 * Returns true if last WQE event should be generated.
a5210c12 474 * The QP r_lock and s_lock should be held and interrupts disabled.
f931551b
RC		 475 * If we are already in error state, just return.
476 */
7c2e11fe 477int qib_error_qp(struct rvt_qp *qp, enum ib_wc_status err)
f931551b 478{
ffc26907 479 struct qib_qp_priv *priv = qp->priv;
f931551b
RC		 480 struct qib_ibdev *dev = to_idev(qp->ibqp.device);
481 struct ib_wc wc;
482 int ret = 0;
483
484 if (qp->state == IB_QPS_ERR || qp->state == IB_QPS_RESET)
485 goto bail;
486
487 qp->state = IB_QPS_ERR;
488
489 if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
490 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
491 del_timer(&qp->s_timer);
492 }
16028f27
MM		 493
494 if (qp->s_flags & QIB_S_ANY_WAIT_SEND)
495 qp->s_flags &= ~QIB_S_ANY_WAIT_SEND;
496
f931551b 497 spin_lock(&dev->pending_lock);
ffc26907 498 if (!list_empty(&priv->iowait) && !(qp->s_flags & QIB_S_BUSY)) {
f931551b 499 qp->s_flags &= ~QIB_S_ANY_WAIT_IO;
ffc26907 500 list_del_init(&priv->iowait);
f931551b
RC		 501 }
502 spin_unlock(&dev->pending_lock);
503
504 if (!(qp->s_flags & QIB_S_BUSY)) {
505 qp->s_hdrwords = 0;
506 if (qp->s_rdma_mr) {
7c2e11fe 507 rvt_put_mr(qp->s_rdma_mr);
f931551b
RC		 508 qp->s_rdma_mr = NULL;
509 }
ffc26907
DD		 510 if (priv->s_tx) {
511 qib_put_txreq(priv->s_tx);
512 priv->s_tx = NULL;
f931551b
RC		 513 }
514 }
515
516 /* Schedule the sending tasklet to drain the send work queue. */
517 if (qp->s_last != qp->s_head)
518 qib_schedule_send(qp);
519
520 clear_mr_refs(qp, 0);
521
522 memset(&wc, 0, sizeof(wc));
523 wc.qp = &qp->ibqp;
524 wc.opcode = IB_WC_RECV;
525
526 if (test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) {
527 wc.wr_id = qp->r_wr_id;
528 wc.status = err;
529 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
530 }
531 wc.status = IB_WC_WR_FLUSH_ERR;
532
533 if (qp->r_rq.wq) {
7c2e11fe 534 struct rvt_rwq *wq;
f931551b
RC		 535 u32 head;
536 u32 tail;
537
538 spin_lock(&qp->r_rq.lock);
539
540 /* sanity check pointers before trusting them */
541 wq = qp->r_rq.wq;
542 head = wq->head;
543 if (head >= qp->r_rq.size)
544 head = 0;
545 tail = wq->tail;
546 if (tail >= qp->r_rq.size)
547 tail = 0;
548 while (tail != head) {
549 wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id;
550 if (++tail >= qp->r_rq.size)
551 tail = 0;
552 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
553 }
554 wq->tail = tail;
555
556 spin_unlock(&qp->r_rq.lock);
557 } else if (qp->ibqp.event_handler)
558 ret = 1;
559
560bail:
561 return ret;
562}
563
564/**
565 * qib_modify_qp - modify the attributes of a queue pair
566 * @ibqp: the queue pair who's attributes we're modifying
567 * @attr: the new attributes
568 * @attr_mask: the mask of attributes to modify
569 * @udata: user data for libibverbs.so
570 *
571 * Returns 0 on success, otherwise returns an errno.
572 */
573int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
574 int attr_mask, struct ib_udata *udata)
575{
576 struct qib_ibdev *dev = to_idev(ibqp->device);
7c2e11fe 577 struct rvt_qp *qp = to_iqp(ibqp);
ffc26907 578 struct qib_qp_priv *priv = qp->priv;
f931551b
RC		 579 enum ib_qp_state cur_state, new_state;
580 struct ib_event ev;
581 int lastwqe = 0;
582 int mig = 0;
583 int ret;
584 u32 pmtu = 0; /* for gcc warning only */
585
586 spin_lock_irq(&qp->r_lock);
587 spin_lock(&qp->s_lock);
588
589 cur_state = attr_mask & IB_QP_CUR_STATE ?
590 attr->cur_qp_state : qp->state;
591 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
592
593 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
dd5f03be 594 attr_mask, IB_LINK_LAYER_UNSPECIFIED))
f931551b
RC		 595 goto inval;
596
597 if (attr_mask & IB_QP_AV) {
9ff198f5 598 if (attr->ah_attr.dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE))
f931551b 599 goto inval;
96ab1ac1 600 if (rvt_check_ah(qp->ibqp.device, &attr->ah_attr))
f931551b
RC		 601 goto inval;
602 }
603
604 if (attr_mask & IB_QP_ALT_PATH) {
9ff198f5
DD		 605 if (attr->alt_ah_attr.dlid >=
606 be16_to_cpu(IB_MULTICAST_LID_BASE))
f931551b 607 goto inval;
96ab1ac1 608 if (rvt_check_ah(qp->ibqp.device, &attr->alt_ah_attr))
f931551b
RC		 609 goto inval;
610 if (attr->alt_pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
611 goto inval;
612 }
613
614 if (attr_mask & IB_QP_PKEY_INDEX)
615 if (attr->pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
616 goto inval;
617
618 if (attr_mask & IB_QP_MIN_RNR_TIMER)
619 if (attr->min_rnr_timer > 31)
620 goto inval;
621
622 if (attr_mask & IB_QP_PORT)
623 if (qp->ibqp.qp_type == IB_QPT_SMI ||
624 qp->ibqp.qp_type == IB_QPT_GSI ||
625 attr->port_num == 0 ||
626 attr->port_num > ibqp->device->phys_port_cnt)
627 goto inval;
628
629 if (attr_mask & IB_QP_DEST_QPN)
630 if (attr->dest_qp_num > QIB_QPN_MASK)
631 goto inval;
632
633 if (attr_mask & IB_QP_RETRY_CNT)
634 if (attr->retry_cnt > 7)
635 goto inval;
636
637 if (attr_mask & IB_QP_RNR_RETRY)
638 if (attr->rnr_retry > 7)
639 goto inval;
640
641 /*
642 * Don't allow invalid path_mtu values. OK to set greater
643 * than the active mtu (or even the max_cap, if we have tuned
644 * that to a small mtu. We'll set qp->path_mtu
645 * to the lesser of requested attribute mtu and active,
646 * for packetizing messages.
647 * Note that the QP port has to be set in INIT and MTU in RTR.
648 */
649 if (attr_mask & IB_QP_PATH_MTU) {
650 struct qib_devdata *dd = dd_from_dev(dev);
651 int mtu, pidx = qp->port_num - 1;
652
653 mtu = ib_mtu_enum_to_int(attr->path_mtu);
654 if (mtu == -1)
655 goto inval;
656 if (mtu > dd->pport[pidx].ibmtu) {
657 switch (dd->pport[pidx].ibmtu) {
658 case 4096:
659 pmtu = IB_MTU_4096;
660 break;
661 case 2048:
662 pmtu = IB_MTU_2048;
663 break;
664 case 1024:
665 pmtu = IB_MTU_1024;
666 break;
667 case 512:
668 pmtu = IB_MTU_512;
669 break;
670 case 256:
671 pmtu = IB_MTU_256;
672 break;
673 default:
674 pmtu = IB_MTU_2048;
675 }
676 } else
677 pmtu = attr->path_mtu;
678 }
679
680 if (attr_mask & IB_QP_PATH_MIG_STATE) {
681 if (attr->path_mig_state == IB_MIG_REARM) {
682 if (qp->s_mig_state == IB_MIG_ARMED)
683 goto inval;
684 if (new_state != IB_QPS_RTS)
685 goto inval;
686 } else if (attr->path_mig_state == IB_MIG_MIGRATED) {
687 if (qp->s_mig_state == IB_MIG_REARM)
688 goto inval;
689 if (new_state != IB_QPS_RTS && new_state != IB_QPS_SQD)
690 goto inval;
691 if (qp->s_mig_state == IB_MIG_ARMED)
692 mig = 1;
693 } else
694 goto inval;
695 }
696
697 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
698 if (attr->max_dest_rd_atomic > QIB_MAX_RDMA_ATOMIC)
699 goto inval;
700
701 switch (new_state) {
702 case IB_QPS_RESET:
703 if (qp->state != IB_QPS_RESET) {
704 qp->state = IB_QPS_RESET;
705 spin_lock(&dev->pending_lock);
ffc26907
DD		 706 if (!list_empty(&priv->iowait))
707 list_del_init(&priv->iowait);
f931551b
RC		 708 spin_unlock(&dev->pending_lock);
709 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
710 spin_unlock(&qp->s_lock);
711 spin_unlock_irq(&qp->r_lock);
712 /* Stop the sending work queue and retry timer */
ffc26907 713 cancel_work_sync(&priv->s_work);
f931551b 714 del_timer_sync(&qp->s_timer);
ffc26907
DD		 715 wait_event(priv->wait_dma,
716 !atomic_read(&priv->s_dma_busy));
717 if (priv->s_tx) {
718 qib_put_txreq(priv->s_tx);
719 priv->s_tx = NULL;
f931551b
RC		 720 }
721 remove_qp(dev, qp);
722 wait_event(qp->wait, !atomic_read(&qp->refcount));
723 spin_lock_irq(&qp->r_lock);
724 spin_lock(&qp->s_lock);
725 clear_mr_refs(qp, 1);
726 qib_reset_qp(qp, ibqp->qp_type);
727 }
728 break;
729
730 case IB_QPS_RTR:
731 /* Allow event to retrigger if QP set to RTR more than once */
732 qp->r_flags &= ~QIB_R_COMM_EST;
733 qp->state = new_state;
734 break;
735
736 case IB_QPS_SQD:
737 qp->s_draining = qp->s_last != qp->s_cur;
738 qp->state = new_state;
739 break;
740
741 case IB_QPS_SQE:
742 if (qp->ibqp.qp_type == IB_QPT_RC)
743 goto inval;
744 qp->state = new_state;
745 break;
746
747 case IB_QPS_ERR:
748 lastwqe = qib_error_qp(qp, IB_WC_WR_FLUSH_ERR);
749 break;
750
751 default:
752 qp->state = new_state;
753 break;
754 }
755
756 if (attr_mask & IB_QP_PKEY_INDEX)
757 qp->s_pkey_index = attr->pkey_index;
758
759 if (attr_mask & IB_QP_PORT)
760 qp->port_num = attr->port_num;
761
762 if (attr_mask & IB_QP_DEST_QPN)
763 qp->remote_qpn = attr->dest_qp_num;
764
765 if (attr_mask & IB_QP_SQ_PSN) {
766 qp->s_next_psn = attr->sq_psn & QIB_PSN_MASK;
767 qp->s_psn = qp->s_next_psn;
768 qp->s_sending_psn = qp->s_next_psn;
769 qp->s_last_psn = qp->s_next_psn - 1;
770 qp->s_sending_hpsn = qp->s_last_psn;
771 }
772
773 if (attr_mask & IB_QP_RQ_PSN)
774 qp->r_psn = attr->rq_psn & QIB_PSN_MASK;
775
776 if (attr_mask & IB_QP_ACCESS_FLAGS)
777 qp->qp_access_flags = attr->qp_access_flags;
778
779 if (attr_mask & IB_QP_AV) {
780 qp->remote_ah_attr = attr->ah_attr;
781 qp->s_srate = attr->ah_attr.static_rate;
782 }
783
784 if (attr_mask & IB_QP_ALT_PATH) {
785 qp->alt_ah_attr = attr->alt_ah_attr;
786 qp->s_alt_pkey_index = attr->alt_pkey_index;
787 }
788
789 if (attr_mask & IB_QP_PATH_MIG_STATE) {
790 qp->s_mig_state = attr->path_mig_state;
791 if (mig) {
792 qp->remote_ah_attr = qp->alt_ah_attr;
793 qp->port_num = qp->alt_ah_attr.port_num;
794 qp->s_pkey_index = qp->s_alt_pkey_index;
795 }
796 }
797
cc6ea138 798 if (attr_mask & IB_QP_PATH_MTU) {
f931551b 799 qp->path_mtu = pmtu;
cc6ea138
MM		 800 qp->pmtu = ib_mtu_enum_to_int(pmtu);
801 }
f931551b
RC		 802
803 if (attr_mask & IB_QP_RETRY_CNT) {
804 qp->s_retry_cnt = attr->retry_cnt;
805 qp->s_retry = attr->retry_cnt;
806 }
807
808 if (attr_mask & IB_QP_RNR_RETRY) {
809 qp->s_rnr_retry_cnt = attr->rnr_retry;
810 qp->s_rnr_retry = attr->rnr_retry;
811 }
812
813 if (attr_mask & IB_QP_MIN_RNR_TIMER)
814 qp->r_min_rnr_timer = attr->min_rnr_timer;
815
d0f2faf7 816 if (attr_mask & IB_QP_TIMEOUT) {
f931551b 817 qp->timeout = attr->timeout;
d0f2faf7
MM		 818 qp->timeout_jiffies =
819 usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
820 1000UL);
821 }
f931551b
RC		 822
823 if (attr_mask & IB_QP_QKEY)
824 qp->qkey = attr->qkey;
825
826 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
827 qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
828
829 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
830 qp->s_max_rd_atomic = attr->max_rd_atomic;
831
832 spin_unlock(&qp->s_lock);
833 spin_unlock_irq(&qp->r_lock);
834
835 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
836 insert_qp(dev, qp);
837
838 if (lastwqe) {
839 ev.device = qp->ibqp.device;
840 ev.element.qp = &qp->ibqp;
841 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
842 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
843 }
844 if (mig) {
845 ev.device = qp->ibqp.device;
846 ev.element.qp = &qp->ibqp;
847 ev.event = IB_EVENT_PATH_MIG;
848 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
849 }
850 ret = 0;
851 goto bail;
852
853inval:
854 spin_unlock(&qp->s_lock);
855 spin_unlock_irq(&qp->r_lock);
856 ret = -EINVAL;
857
858bail:
859 return ret;
860}
861
862int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
863 int attr_mask, struct ib_qp_init_attr *init_attr)
864{
7c2e11fe 865 struct rvt_qp *qp = to_iqp(ibqp);
f931551b
RC		 866
867 attr->qp_state = qp->state;
868 attr->cur_qp_state = attr->qp_state;
869 attr->path_mtu = qp->path_mtu;
870 attr->path_mig_state = qp->s_mig_state;
871 attr->qkey = qp->qkey;
872 attr->rq_psn = qp->r_psn & QIB_PSN_MASK;
873 attr->sq_psn = qp->s_next_psn & QIB_PSN_MASK;
874 attr->dest_qp_num = qp->remote_qpn;
875 attr->qp_access_flags = qp->qp_access_flags;
876 attr->cap.max_send_wr = qp->s_size - 1;
877 attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1;
878 attr->cap.max_send_sge = qp->s_max_sge;
879 attr->cap.max_recv_sge = qp->r_rq.max_sge;
880 attr->cap.max_inline_data = 0;
881 attr->ah_attr = qp->remote_ah_attr;
882 attr->alt_ah_attr = qp->alt_ah_attr;
883 attr->pkey_index = qp->s_pkey_index;
884 attr->alt_pkey_index = qp->s_alt_pkey_index;
885 attr->en_sqd_async_notify = 0;
886 attr->sq_draining = qp->s_draining;
887 attr->max_rd_atomic = qp->s_max_rd_atomic;
888 attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
889 attr->min_rnr_timer = qp->r_min_rnr_timer;
890 attr->port_num = qp->port_num;
891 attr->timeout = qp->timeout;
892 attr->retry_cnt = qp->s_retry_cnt;
893 attr->rnr_retry = qp->s_rnr_retry_cnt;
894 attr->alt_port_num = qp->alt_ah_attr.port_num;
895 attr->alt_timeout = qp->alt_timeout;
896
897 init_attr->event_handler = qp->ibqp.event_handler;
898 init_attr->qp_context = qp->ibqp.qp_context;
899 init_attr->send_cq = qp->ibqp.send_cq;
900 init_attr->recv_cq = qp->ibqp.recv_cq;
901 init_attr->srq = qp->ibqp.srq;
902 init_attr->cap = attr->cap;
903 if (qp->s_flags & QIB_S_SIGNAL_REQ_WR)
904 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
905 else
906 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
907 init_attr->qp_type = qp->ibqp.qp_type;
908 init_attr->port_num = qp->port_num;
909 return 0;
910}
911
912/**
913 * qib_compute_aeth - compute the AETH (syndrome + MSN)
914 * @qp: the queue pair to compute the AETH for
915 *
916 * Returns the AETH.
917 */
7c2e11fe 918__be32 qib_compute_aeth(struct rvt_qp *qp)
f931551b
RC		 919{
920 u32 aeth = qp->r_msn & QIB_MSN_MASK;
921
922 if (qp->ibqp.srq) {
923 /*
924 * Shared receive queues don't generate credits.
925 * Set the credit field to the invalid value.
926 */
927 aeth |= QIB_AETH_CREDIT_INVAL << QIB_AETH_CREDIT_SHIFT;
928 } else {
929 u32 min, max, x;
930 u32 credits;
7c2e11fe 931 struct rvt_rwq *wq = qp->r_rq.wq;
f931551b
RC		 932 u32 head;
933 u32 tail;
934
935 /* sanity check pointers before trusting them */
936 head = wq->head;
937 if (head >= qp->r_rq.size)
938 head = 0;
939 tail = wq->tail;
940 if (tail >= qp->r_rq.size)
941 tail = 0;
942 /*
943 * Compute the number of credits available (RWQEs).
944 * XXX Not holding the r_rq.lock here so there is a small
945 * chance that the pair of reads are not atomic.
946 */
947 credits = head - tail;
948 if ((int)credits < 0)
949 credits += qp->r_rq.size;
950 /*
951 * Binary search the credit table to find the code to
952 * use.
953 */
954 min = 0;
955 max = 31;
956 for (;;) {
957 x = (min + max) / 2;
958 if (credit_table[x] == credits)
959 break;
960 if (credit_table[x] > credits)
961 max = x;
962 else if (min == x)
963 break;
964 else
965 min = x;
966 }
967 aeth |= x << QIB_AETH_CREDIT_SHIFT;
968 }
969 return cpu_to_be32(aeth);
970}
971
972/**
973 * qib_create_qp - create a queue pair for a device
974 * @ibpd: the protection domain who's device we create the queue pair for
975 * @init_attr: the attributes of the queue pair
976 * @udata: user data for libibverbs.so
977 *
978 * Returns the queue pair on success, otherwise returns an errno.
979 *
980 * Called by the ib_create_qp() core verbs function.
981 */
982struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
983 struct ib_qp_init_attr *init_attr,
984 struct ib_udata *udata)
985{
7c2e11fe 986 struct rvt_qp *qp;
f931551b 987 int err;
7c2e11fe 988 struct rvt_swqe *swq = NULL;
f931551b
RC		 989 struct qib_ibdev *dev;
990 struct qib_devdata *dd;
991 size_t sz;
992 size_t sg_list_sz;
993 struct ib_qp *ret;
fbbeb863 994 gfp_t gfp;
ffc26907 995 struct qib_qp_priv *priv;
f931551b
RC		 996
997 if (init_attr->cap.max_send_sge > ib_qib_max_sges ||
60093dc0 998 init_attr->cap.max_send_wr > ib_qib_max_qp_wrs ||
fbbeb863
VA		 999 init_attr->create_flags & ~(IB_QP_CREATE_USE_GFP_NOIO))
1000 return ERR_PTR(-EINVAL);
1001
1002 /* GFP_NOIO is applicable in RC QPs only */
1003 if (init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO &&
1004 init_attr->qp_type != IB_QPT_RC)
1005 return ERR_PTR(-EINVAL);
1006
1007 gfp = init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO ?
1008 GFP_NOIO : GFP_KERNEL;
f931551b
RC		 1009
1010 /* Check receive queue parameters if no SRQ is specified. */
1011 if (!init_attr->srq) {
1012 if (init_attr->cap.max_recv_sge > ib_qib_max_sges ||
1013 init_attr->cap.max_recv_wr > ib_qib_max_qp_wrs) {
1014 ret = ERR_PTR(-EINVAL);
1015 goto bail;
1016 }
1017 if (init_attr->cap.max_send_sge +
1018 init_attr->cap.max_send_wr +
1019 init_attr->cap.max_recv_sge +
1020 init_attr->cap.max_recv_wr == 0) {
1021 ret = ERR_PTR(-EINVAL);
1022 goto bail;
1023 }
1024 }
1025
1026 switch (init_attr->qp_type) {
1027 case IB_QPT_SMI:
1028 case IB_QPT_GSI:
1029 if (init_attr->port_num == 0 ||
1030 init_attr->port_num > ibpd->device->phys_port_cnt) {
1031 ret = ERR_PTR(-EINVAL);
1032 goto bail;
1033 }
1034 case IB_QPT_UC:
1035 case IB_QPT_RC:
1036 case IB_QPT_UD:
7c2e11fe 1037 sz = sizeof(struct rvt_sge) *
f931551b 1038 init_attr->cap.max_send_sge +
7c2e11fe 1039 sizeof(struct rvt_swqe);
fbbeb863
VA		 1040 swq = __vmalloc((init_attr->cap.max_send_wr + 1) * sz,
1041 gfp, PAGE_KERNEL);
f931551b
RC		 1042 if (swq == NULL) {
1043 ret = ERR_PTR(-ENOMEM);
1044 goto bail;
1045 }
1046 sz = sizeof(*qp);
1047 sg_list_sz = 0;
1048 if (init_attr->srq) {
894c727b 1049 struct rvt_srq *srq = ibsrq_to_rvtsrq(init_attr->srq);
f931551b
RC		 1050
1051 if (srq->rq.max_sge > 1)
1052 sg_list_sz = sizeof(*qp->r_sg_list) *
1053 (srq->rq.max_sge - 1);
1054 } else if (init_attr->cap.max_recv_sge > 1)
1055 sg_list_sz = sizeof(*qp->r_sg_list) *
1056 (init_attr->cap.max_recv_sge - 1);
fbbeb863 1057 qp = kzalloc(sz + sg_list_sz, gfp);
f931551b
RC		 1058 if (!qp) {
1059 ret = ERR_PTR(-ENOMEM);
1060 goto bail_swq;
1061 }
af061a64 1062 RCU_INIT_POINTER(qp->next, NULL);
ffc26907
DD		 1063 priv = kzalloc(sizeof(*priv), gfp);
1064 if (!priv) {
1065 ret = ERR_PTR(-ENOMEM);
1066 goto bail_qp_hdr;
1067 }
1068 priv->owner = qp;
1069 priv->s_hdr = kzalloc(sizeof(*priv->s_hdr), gfp);
1070 if (!priv->s_hdr) {
1c94283d
MM		 1071 ret = ERR_PTR(-ENOMEM);
1072 goto bail_qp;
1073 }
ffc26907 1074 qp->priv = priv;
d0f2faf7
MM		 1075 qp->timeout_jiffies =
1076 usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
1077 1000UL);
f931551b
RC		 1078 if (init_attr->srq)
1079 sz = 0;
1080 else {
1081 qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
1082 qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
1083 sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
7c2e11fe 1084 sizeof(struct rvt_rwqe);
fbbeb863
VA		 1085 if (gfp != GFP_NOIO)
1086 qp->r_rq.wq = vmalloc_user(
7c2e11fe 1087 sizeof(struct rvt_rwq) +
fbbeb863
VA		 1088 qp->r_rq.size * sz);
1089 else
1090 qp->r_rq.wq = __vmalloc(
7c2e11fe 1091 sizeof(struct rvt_rwq) +
fbbeb863
VA		 1092 qp->r_rq.size * sz,
1093 gfp, PAGE_KERNEL);
1094
f931551b
RC		 1095 if (!qp->r_rq.wq) {
1096 ret = ERR_PTR(-ENOMEM);
1097 goto bail_qp;
1098 }
1099 }
1100
1101 /*
1102 * ib_create_qp() will initialize qp->ibqp
1103 * except for qp->ibqp.qp_num.
1104 */
1105 spin_lock_init(&qp->r_lock);
1106 spin_lock_init(&qp->s_lock);
1107 spin_lock_init(&qp->r_rq.lock);
1108 atomic_set(&qp->refcount, 0);
1109 init_waitqueue_head(&qp->wait);
ffc26907 1110 init_waitqueue_head(&priv->wait_dma);
f931551b
RC		 1111 init_timer(&qp->s_timer);
1112 qp->s_timer.data = (unsigned long)qp;
ffc26907
DD		 1113 INIT_WORK(&priv->s_work, qib_do_send);
1114 INIT_LIST_HEAD(&priv->iowait);
f931551b
RC		 1115 INIT_LIST_HEAD(&qp->rspwait);
1116 qp->state = IB_QPS_RESET;
1117 qp->s_wq = swq;
1118 qp->s_size = init_attr->cap.max_send_wr + 1;
1119 qp->s_max_sge = init_attr->cap.max_send_sge;
1120 if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
1121 qp->s_flags = QIB_S_SIGNAL_REQ_WR;
1122 dev = to_idev(ibpd->device);
1123 dd = dd_from_dev(dev);
1124 err = alloc_qpn(dd, &dev->qpn_table, init_attr->qp_type,
fbbeb863 1125 init_attr->port_num, gfp);
f931551b
RC		 1126 if (err < 0) {
1127 ret = ERR_PTR(err);
1128 vfree(qp->r_rq.wq);
1129 goto bail_qp;
1130 }
1131 qp->ibqp.qp_num = err;
1132 qp->port_num = init_attr->port_num;
f931551b
RC		 1133 qib_reset_qp(qp, init_attr->qp_type);
1134 break;
1135
1136 default:
1137 /* Don't support raw QPs */
1138 ret = ERR_PTR(-ENOSYS);
1139 goto bail;
1140 }
1141
1142 init_attr->cap.max_inline_data = 0;
1143
1144 /*
1145 * Return the address of the RWQ as the offset to mmap.
1146 * See qib_mmap() for details.
1147 */
1148 if (udata && udata->outlen >= sizeof(__u64)) {
1149 if (!qp->r_rq.wq) {
1150 __u64 offset = 0;
1151
1152 err = ib_copy_to_udata(udata, &offset,
1153 sizeof(offset));
1154 if (err) {
1155 ret = ERR_PTR(err);
1156 goto bail_ip;
1157 }
1158 } else {
7c2e11fe 1159 u32 s = sizeof(struct rvt_rwq) + qp->r_rq.size * sz;
f931551b
RC		 1160
1161 qp->ip = qib_create_mmap_info(dev, s,
1162 ibpd->uobject->context,
1163 qp->r_rq.wq);
1164 if (!qp->ip) {
1165 ret = ERR_PTR(-ENOMEM);
1166 goto bail_ip;
1167 }
1168
1169 err = ib_copy_to_udata(udata, &(qp->ip->offset),
1170 sizeof(qp->ip->offset));
1171 if (err) {
1172 ret = ERR_PTR(err);
1173 goto bail_ip;
1174 }
1175 }
1176 }
1177
1178 spin_lock(&dev->n_qps_lock);
1179 if (dev->n_qps_allocated == ib_qib_max_qps) {
1180 spin_unlock(&dev->n_qps_lock);
1181 ret = ERR_PTR(-ENOMEM);
1182 goto bail_ip;
1183 }
1184
1185 dev->n_qps_allocated++;
1186 spin_unlock(&dev->n_qps_lock);
1187
1188 if (qp->ip) {
1189 spin_lock_irq(&dev->pending_lock);
1190 list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps);
1191 spin_unlock_irq(&dev->pending_lock);
1192 }
1193
1194 ret = &qp->ibqp;
1195 goto bail;
1196
1197bail_ip:
1198 if (qp->ip)
1199 kref_put(&qp->ip->ref, qib_release_mmap_info);
1200 else
1201 vfree(qp->r_rq.wq);
1202 free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
1203bail_qp:
ffc26907
DD		 1204 kfree(priv->s_hdr);
1205 kfree(priv);
1206bail_qp_hdr:
f931551b
RC		 1207 kfree(qp);
1208bail_swq:
1209 vfree(swq);
1210bail:
1211 return ret;
1212}
1213
1214/**
1215 * qib_destroy_qp - destroy a queue pair
1216 * @ibqp: the queue pair to destroy
1217 *
1218 * Returns 0 on success.
1219 *
1220 * Note that this can be called while the QP is actively sending or
1221 * receiving!
1222 */
1223int qib_destroy_qp(struct ib_qp *ibqp)
1224{
7c2e11fe 1225 struct rvt_qp *qp = to_iqp(ibqp);
f931551b 1226 struct qib_ibdev *dev = to_idev(ibqp->device);
ffc26907 1227 struct qib_qp_priv *priv = qp->priv;
f931551b
RC		 1228
1229 /* Make sure HW and driver activity is stopped. */
1230 spin_lock_irq(&qp->s_lock);
1231 if (qp->state != IB_QPS_RESET) {
1232 qp->state = IB_QPS_RESET;
1233 spin_lock(&dev->pending_lock);
ffc26907
DD		 1234 if (!list_empty(&priv->iowait))
1235 list_del_init(&priv->iowait);
f931551b
RC		 1236 spin_unlock(&dev->pending_lock);
1237 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
1238 spin_unlock_irq(&qp->s_lock);
ffc26907 1239 cancel_work_sync(&priv->s_work);
f931551b 1240 del_timer_sync(&qp->s_timer);
ffc26907
DD		 1241 wait_event(priv->wait_dma, !atomic_read(&priv->s_dma_busy));
1242 if (priv->s_tx) {
1243 qib_put_txreq(priv->s_tx);
1244 priv->s_tx = NULL;
f931551b
RC		 1245 }
1246 remove_qp(dev, qp);
1247 wait_event(qp->wait, !atomic_read(&qp->refcount));
1248 clear_mr_refs(qp, 1);
1249 } else
1250 spin_unlock_irq(&qp->s_lock);
1251
1252 /* all user's cleaned up, mark it available */
1253 free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
1254 spin_lock(&dev->n_qps_lock);
1255 dev->n_qps_allocated--;
1256 spin_unlock(&dev->n_qps_lock);
1257
1258 if (qp->ip)
1259 kref_put(&qp->ip->ref, qib_release_mmap_info);
1260 else
1261 vfree(qp->r_rq.wq);
1262 vfree(qp->s_wq);
ffc26907
DD		 1263 kfree(priv->s_hdr);
1264 kfree(priv);
f931551b
RC		 1265 kfree(qp);
1266 return 0;
1267}
1268
1269/**
1270 * qib_init_qpn_table - initialize the QP number table for a device
1271 * @qpt: the QPN table
1272 */
1273void qib_init_qpn_table(struct qib_devdata *dd, struct qib_qpn_table *qpt)
1274{
1275 spin_lock_init(&qpt->lock);
1276 qpt->last = 1; /* start with QPN 2 */
1277 qpt->nmaps = 1;
1278 qpt->mask = dd->qpn_mask;
1279}
1280
1281/**
1282 * qib_free_qpn_table - free the QP number table for a device
1283 * @qpt: the QPN table
1284 */
1285void qib_free_qpn_table(struct qib_qpn_table *qpt)
1286{
1287 int i;
1288
1289 for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
1290 if (qpt->map[i].page)
1291 free_page((unsigned long) qpt->map[i].page);
1292}
1293
1294/**
1295 * qib_get_credit - flush the send work queue of a QP
1296 * @qp: the qp who's send work queue to flush
1297 * @aeth: the Acknowledge Extended Transport Header
1298 *
1299 * The QP s_lock should be held.
1300 */
7c2e11fe 1301void qib_get_credit(struct rvt_qp *qp, u32 aeth)
f931551b
RC		 1302{
1303 u32 credit = (aeth >> QIB_AETH_CREDIT_SHIFT) & QIB_AETH_CREDIT_MASK;
1304
1305 /*
1306 * If the credit is invalid, we can send
1307 * as many packets as we like. Otherwise, we have to
1308 * honor the credit field.
1309 */
1310 if (credit == QIB_AETH_CREDIT_INVAL) {
1311 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
1312 qp->s_flags |= QIB_S_UNLIMITED_CREDIT;
1313 if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
1314 qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
1315 qib_schedule_send(qp);
1316 }
1317 }
1318 } else if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
1319 /* Compute new LSN (i.e., MSN + credit) */
1320 credit = (aeth + credit_table[credit]) & QIB_MSN_MASK;
1321 if (qib_cmp24(credit, qp->s_lsn) > 0) {
1322 qp->s_lsn = credit;
1323 if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
1324 qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
1325 qib_schedule_send(qp);
1326 }
1327 }
1328 }
1329}
1dd173b0
MM		 1330
1331#ifdef CONFIG_DEBUG_FS
1332
1333struct qib_qp_iter {
1334 struct qib_ibdev *dev;
7c2e11fe 1335 struct rvt_qp *qp;
1dd173b0
MM		 1336 int n;
1337};
1338
1339struct qib_qp_iter *qib_qp_iter_init(struct qib_ibdev *dev)
1340{
1341 struct qib_qp_iter *iter;
1342
1343 iter = kzalloc(sizeof(*iter), GFP_KERNEL);
1344 if (!iter)
1345 return NULL;
1346
1347 iter->dev = dev;
1348 if (qib_qp_iter_next(iter)) {
1349 kfree(iter);
1350 return NULL;
1351 }
1352
1353 return iter;
1354}
1355
1356int qib_qp_iter_next(struct qib_qp_iter *iter)
1357{
1358 struct qib_ibdev *dev = iter->dev;
1359 int n = iter->n;
1360 int ret = 1;
7c2e11fe
DD		 1361 struct rvt_qp *pqp = iter->qp;
1362 struct rvt_qp *qp;
1dd173b0 1363
1dd173b0
MM		 1364 for (; n < dev->qp_table_size; n++) {
1365 if (pqp)
1366 qp = rcu_dereference(pqp->next);
1367 else
1368 qp = rcu_dereference(dev->qp_table[n]);
1369 pqp = qp;
1370 if (qp) {
1dd173b0
MM		 1371 iter->qp = qp;
1372 iter->n = n;
1373 return 0;
1374 }
1375 }
1dd173b0
MM		 1376 return ret;
1377}
1378
1379static const char * const qp_type_str[] = {
1380 "SMI", "GSI", "RC", "UC", "UD",
1381};
1382
1383void qib_qp_iter_print(struct seq_file *s, struct qib_qp_iter *iter)
1384{
7c2e11fe
DD		 1385 struct rvt_swqe *wqe;
1386 struct rvt_qp *qp = iter->qp;
ffc26907 1387 struct qib_qp_priv *priv = qp->priv;
1dd173b0
MM		 1388
1389 wqe = get_swqe_ptr(qp, qp->s_last);
1390 seq_printf(s,
1391 "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",
1392 iter->n,
1393 qp->ibqp.qp_num,
1394 qp_type_str[qp->ibqp.qp_type],
1395 qp->state,
1396 wqe->wr.opcode,
1397 qp->s_hdrwords,
1398 qp->s_flags,
ffc26907
DD		 1399 atomic_read(&priv->s_dma_busy),
1400 !list_empty(&priv->iowait),
1dd173b0
MM		 1401 qp->timeout,
1402 wqe->ssn,
1403 qp->s_lsn,
1404 qp->s_last_psn,
1405 qp->s_psn, qp->s_next_psn,
1406 qp->s_sending_psn, qp->s_sending_hpsn,
1407 qp->s_last, qp->s_acked, qp->s_cur,
1408 qp->s_tail, qp->s_head, qp->s_size,
1409 qp->remote_qpn,
1410 qp->remote_ah_attr.dlid);
1411}
1412
1413#endif
Linux kernel - Deliverables
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