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