kernel/drivers/infiniband/hw/qib/qib_qp.c

   1 /*
   2  * Copyright (c) 2012, 2013 Intel Corporation.  All rights reserved.
   3  * Copyright (c) 2006 - 2012 QLogic Corporation.  * All rights reserved.
   4  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/err.h>
  36 #include <linux/vmalloc.h>
  37 #include <linux/jhash.h>
  38 #ifdef CONFIG_DEBUG_FS
  39 #include <linux/seq_file.h>
  40 #endif
  41
  42 #include "qib.h"
  43
  44 #define BITS_PER_PAGE           (PAGE_SIZE*BITS_PER_BYTE)
  45 #define BITS_PER_PAGE_MASK      (BITS_PER_PAGE-1)
  46
  47 static inline unsigned mk_qpn(struct qib_qpn_table *qpt,
  48                               struct qpn_map *map, unsigned off)
  49 {
  50         return (map - qpt->map) * BITS_PER_PAGE + off;
  51 }
  52
  53 static inline unsigned find_next_offset(struct qib_qpn_table *qpt,
  54                                         struct qpn_map *map, unsigned off,
  55                                         unsigned n)
  56 {
  57         if (qpt->mask) {
  58                 off++;
  59                 if (((off & qpt->mask) >> 1) >= n)
  60                         off = (off | qpt->mask) + 2;
  61         } else
  62                 off = find_next_zero_bit(map->page, BITS_PER_PAGE, off);
  63         return off;
  64 }
  65
  66 /*
  67  * Convert the AETH credit code into the number of credits.
  68  */
  69 static u32 credit_table[31] = {
  70         0,                      /* 0 */
  71         1,                      /* 1 */
  72         2,                      /* 2 */
  73         3,                      /* 3 */
  74         4,                      /* 4 */
  75         6,                      /* 5 */
  76         8,                      /* 6 */
  77         12,                     /* 7 */
  78         16,                     /* 8 */
  79         24,                     /* 9 */
  80         32,                     /* A */
  81         48,                     /* B */
  82         64,                     /* C */
  83         96,                     /* D */
  84         128,                    /* E */
  85         192,                    /* F */
  86         256,                    /* 10 */
  87         384,                    /* 11 */
  88         512,                    /* 12 */
  89         768,                    /* 13 */
  90         1024,                   /* 14 */
  91         1536,                   /* 15 */
  92         2048,                   /* 16 */
  93         3072,                   /* 17 */
  94         4096,                   /* 18 */
  95         6144,                   /* 19 */
  96         8192,                   /* 1A */
  97         12288,                  /* 1B */
  98         16384,                  /* 1C */
  99         24576,                  /* 1D */
 100         32768                   /* 1E */
 101 };
 102
 103 static void get_map_page(struct qib_qpn_table *qpt, struct qpn_map *map,
 104                          gfp_t gfp)
 105 {
 106         unsigned long page = get_zeroed_page(gfp);
 107
 108         /*
 109          * Free the page if someone raced with us installing it.
 110          */
 111
 112         spin_lock(&qpt->lock);
 113         if (map->page)
 114                 free_page(page);
 115         else
 116                 map->page = (void *)page;
 117         spin_unlock(&qpt->lock);
 118 }
 119
 120 /*
 121  * Allocate the next available QPN or
 122  * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
 123  */
 124 static int alloc_qpn(struct qib_devdata *dd, struct qib_qpn_table *qpt,
 125                      enum ib_qp_type type, u8 port, gfp_t gfp)
 126 {
 127         u32 i, offset, max_scan, qpn;
 128         struct qpn_map *map;
 129         u32 ret;
 130
 131         if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
 132                 unsigned n;
 133
 134                 ret = type == IB_QPT_GSI;
 135                 n = 1 << (ret + 2 * (port - 1));
 136                 spin_lock(&qpt->lock);
 137                 if (qpt->flags & n)
 138                         ret = -EINVAL;
 139                 else
 140                         qpt->flags |= n;
 141                 spin_unlock(&qpt->lock);
 142                 goto bail;
 143         }
 144
 145         qpn = qpt->last + 2;
 146         if (qpn >= QPN_MAX)
 147                 qpn = 2;
 148         if (qpt->mask && ((qpn & qpt->mask) >> 1) >= dd->n_krcv_queues)
 149                 qpn = (qpn | qpt->mask) + 2;
 150         offset = qpn & BITS_PER_PAGE_MASK;
 151         map = &qpt->map[qpn / BITS_PER_PAGE];
 152         max_scan = qpt->nmaps - !offset;
 153         for (i = 0;;) {
 154                 if (unlikely(!map->page)) {
 155                         get_map_page(qpt, map, gfp);
 156                         if (unlikely(!map->page))
 157                                 break;
 158                 }
 159                 do {
 160                         if (!test_and_set_bit(offset, map->page)) {
 161                                 qpt->last = qpn;
 162                                 ret = qpn;
 163                                 goto bail;
 164                         }
 165                         offset = find_next_offset(qpt, map, offset,
 166                                 dd->n_krcv_queues);
 167                         qpn = mk_qpn(qpt, map, offset);
 168                         /*
 169                          * This test differs from alloc_pidmap().
 170                          * If find_next_offset() does find a zero
 171                          * bit, we don't need to check for QPN
 172                          * wrapping around past our starting QPN.
 173                          * We just need to be sure we don't loop
 174                          * forever.
 175                          */
 176                 } while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
 177                 /*
 178                  * In order to keep the number of pages allocated to a
 179                  * minimum, we scan the all existing pages before increasing
 180                  * the size of the bitmap table.
 181                  */
 182                 if (++i > max_scan) {
 183                         if (qpt->nmaps == QPNMAP_ENTRIES)
 184                                 break;
 185                         map = &qpt->map[qpt->nmaps++];
 186                         offset = 0;
 187                 } else if (map < &qpt->map[qpt->nmaps]) {
 188                         ++map;
 189                         offset = 0;
 190                 } else {
 191                         map = &qpt->map[0];
 192                         offset = 2;
 193                 }
 194                 qpn = mk_qpn(qpt, map, offset);
 195         }
 196
 197         ret = -ENOMEM;
 198
 199 bail:
 200         return ret;
 201 }
 202
 203 static void free_qpn(struct qib_qpn_table *qpt, u32 qpn)
 204 {
 205         struct qpn_map *map;
 206
 207         map = qpt->map + qpn / BITS_PER_PAGE;
 208         if (map->page)
 209                 clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
 210 }
 211
 212 static inline unsigned qpn_hash(struct qib_ibdev *dev, u32 qpn)
 213 {
 214         return jhash_1word(qpn, dev->qp_rnd) &
 215                 (dev->qp_table_size - 1);
 216 }
 217
 218
 219 /*
 220  * Put the QP into the hash table.
 221  * The hash table holds a reference to the QP.
 222  */
 223 static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp)
 224 {
 225         struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 226         unsigned long flags;
 227         unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
 228
 229         atomic_inc(&qp->refcount);
 230         spin_lock_irqsave(&dev->qpt_lock, flags);
 231
 232         if (qp->ibqp.qp_num == 0)
 233                 rcu_assign_pointer(ibp->qp0, qp);
 234         else if (qp->ibqp.qp_num == 1)
 235                 rcu_assign_pointer(ibp->qp1, qp);
 236         else {
 237                 qp->next = dev->qp_table[n];
 238                 rcu_assign_pointer(dev->qp_table[n], qp);
 239         }
 240
 241         spin_unlock_irqrestore(&dev->qpt_lock, flags);
 242 }
 243
 244 /*
 245  * Remove the QP from the table so it can't be found asynchronously by
 246  * the receive interrupt routine.
 247  */
 248 static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp)
 249 {
 250         struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 251         unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
 252         unsigned long flags;
 253         int removed = 1;
 254
 255         spin_lock_irqsave(&dev->qpt_lock, flags);
 256
 257         if (rcu_dereference_protected(ibp->qp0,
 258                         lockdep_is_held(&dev->qpt_lock)) == qp) {
 259                 RCU_INIT_POINTER(ibp->qp0, NULL);
 260         } else if (rcu_dereference_protected(ibp->qp1,
 261                         lockdep_is_held(&dev->qpt_lock)) == qp) {
 262                 RCU_INIT_POINTER(ibp->qp1, NULL);
 263         } else {
 264                 struct qib_qp *q;
 265                 struct qib_qp __rcu **qpp;
 266
 267                 removed = 0;
 268                 qpp = &dev->qp_table[n];
 269                 for (; (q = rcu_dereference_protected(*qpp,
 270                                 lockdep_is_held(&dev->qpt_lock))) != NULL;
 271                                 qpp = &q->next)
 272                         if (q == qp) {
 273                                 RCU_INIT_POINTER(*qpp,
 274                                         rcu_dereference_protected(qp->next,
 275                                          lockdep_is_held(&dev->qpt_lock)));
 276                                 removed = 1;
 277                                 break;
 278                         }
 279         }
 280
 281         spin_unlock_irqrestore(&dev->qpt_lock, flags);
 282         if (removed) {
 283                 synchronize_rcu();
 284                 atomic_dec(&qp->refcount);
 285         }
 286 }
 287
 288 /**
 289  * qib_free_all_qps - check for QPs still in use
 290  * @qpt: the QP table to empty
 291  *
 292  * There should not be any QPs still in use.
 293  * Free memory for table.
 294  */
 295 unsigned qib_free_all_qps(struct qib_devdata *dd)
 296 {
 297         struct qib_ibdev *dev = &dd->verbs_dev;
 298         unsigned long flags;
 299         struct qib_qp *qp;
 300         unsigned n, qp_inuse = 0;
 301
 302         for (n = 0; n < dd->num_pports; n++) {
 303                 struct qib_ibport *ibp = &dd->pport[n].ibport_data;
 304
 305                 if (!qib_mcast_tree_empty(ibp))
 306                         qp_inuse++;
 307                 rcu_read_lock();
 308                 if (rcu_dereference(ibp->qp0))
 309                         qp_inuse++;
 310                 if (rcu_dereference(ibp->qp1))
 311                         qp_inuse++;
 312                 rcu_read_unlock();
 313         }
 314
 315         spin_lock_irqsave(&dev->qpt_lock, flags);
 316         for (n = 0; n < dev->qp_table_size; n++) {
 317                 qp = rcu_dereference_protected(dev->qp_table[n],
 318                         lockdep_is_held(&dev->qpt_lock));
 319                 RCU_INIT_POINTER(dev->qp_table[n], NULL);
 320
 321                 for (; qp; qp = rcu_dereference_protected(qp->next,
 322                                         lockdep_is_held(&dev->qpt_lock)))
 323                         qp_inuse++;
 324         }
 325         spin_unlock_irqrestore(&dev->qpt_lock, flags);
 326         synchronize_rcu();
 327
 328         return qp_inuse;
 329 }
 330
 331 /**
 332  * qib_lookup_qpn - return the QP with the given QPN
 333  * @qpt: the QP table
 334  * @qpn: the QP number to look up
 335  *
 336  * The caller is responsible for decrementing the QP reference count
 337  * when done.
 338  */
 339 struct qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
 340 {
 341         struct qib_qp *qp = NULL;
 342
 343         rcu_read_lock();
 344         if (unlikely(qpn <= 1)) {
 345                 if (qpn == 0)
 346                         qp = rcu_dereference(ibp->qp0);
 347                 else
 348                         qp = rcu_dereference(ibp->qp1);
 349                 if (qp)
 350                         atomic_inc(&qp->refcount);
 351         } else {
 352                 struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
 353                 unsigned n = qpn_hash(dev, qpn);
 354
 355                 for (qp = rcu_dereference(dev->qp_table[n]); qp;
 356                         qp = rcu_dereference(qp->next))
 357                         if (qp->ibqp.qp_num == qpn) {
 358                                 atomic_inc(&qp->refcount);
 359                                 break;
 360                         }
 361         }
 362         rcu_read_unlock();
 363         return qp;
 364 }
 365
 366 /**
 367  * qib_reset_qp - initialize the QP state to the reset state
 368  * @qp: the QP to reset
 369  * @type: the QP type
 370  */
 371 static void qib_reset_qp(struct qib_qp *qp, enum ib_qp_type type)
 372 {
 373         qp->remote_qpn = 0;
 374         qp->qkey = 0;
 375         qp->qp_access_flags = 0;
 376         atomic_set(&qp->s_dma_busy, 0);
 377         qp->s_flags &= QIB_S_SIGNAL_REQ_WR;
 378         qp->s_hdrwords = 0;
 379         qp->s_wqe = NULL;
 380         qp->s_draining = 0;
 381         qp->s_next_psn = 0;
 382         qp->s_last_psn = 0;
 383         qp->s_sending_psn = 0;
 384         qp->s_sending_hpsn = 0;
 385         qp->s_psn = 0;
 386         qp->r_psn = 0;
 387         qp->r_msn = 0;
 388         if (type == IB_QPT_RC) {
 389                 qp->s_state = IB_OPCODE_RC_SEND_LAST;
 390                 qp->r_state = IB_OPCODE_RC_SEND_LAST;
 391         } else {
 392                 qp->s_state = IB_OPCODE_UC_SEND_LAST;
 393                 qp->r_state = IB_OPCODE_UC_SEND_LAST;
 394         }
 395         qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
 396         qp->r_nak_state = 0;
 397         qp->r_aflags = 0;
 398         qp->r_flags = 0;
 399         qp->s_head = 0;
 400         qp->s_tail = 0;
 401         qp->s_cur = 0;
 402         qp->s_acked = 0;
 403         qp->s_last = 0;
 404         qp->s_ssn = 1;
 405         qp->s_lsn = 0;
 406         qp->s_mig_state = IB_MIG_MIGRATED;
 407         memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
 408         qp->r_head_ack_queue = 0;
 409         qp->s_tail_ack_queue = 0;
 410         qp->s_num_rd_atomic = 0;
 411         if (qp->r_rq.wq) {
 412                 qp->r_rq.wq->head = 0;
 413                 qp->r_rq.wq->tail = 0;
 414         }
 415         qp->r_sge.num_sge = 0;
 416 }
 417
 418 static void clear_mr_refs(struct qib_qp *qp, int clr_sends)
 419 {
 420         unsigned n;
 421
 422         if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
 423                 qib_put_ss(&qp->s_rdma_read_sge);
 424
 425         qib_put_ss(&qp->r_sge);
 426
 427         if (clr_sends) {
 428                 while (qp->s_last != qp->s_head) {
 429                         struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
 430                         unsigned i;
 431
 432                         for (i = 0; i < wqe->wr.num_sge; i++) {
 433                                 struct qib_sge *sge = &wqe->sg_list[i];
 434
 435                                 qib_put_mr(sge->mr);
 436                         }
 437                         if (qp->ibqp.qp_type == IB_QPT_UD ||
 438                             qp->ibqp.qp_type == IB_QPT_SMI ||
 439                             qp->ibqp.qp_type == IB_QPT_GSI)
 440                                 atomic_dec(&to_iah(wqe->ud_wr.ah)->refcount);
 441                         if (++qp->s_last >= qp->s_size)
 442                                 qp->s_last = 0;
 443                 }
 444                 if (qp->s_rdma_mr) {
 445                         qib_put_mr(qp->s_rdma_mr);
 446                         qp->s_rdma_mr = NULL;
 447                 }
 448         }
 449
 450         if (qp->ibqp.qp_type != IB_QPT_RC)
 451                 return;
 452
 453         for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) {
 454                 struct qib_ack_entry *e = &qp->s_ack_queue[n];
 455
 456                 if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST &&
 457                     e->rdma_sge.mr) {
 458                         qib_put_mr(e->rdma_sge.mr);
 459                         e->rdma_sge.mr = NULL;
 460                 }
 461         }
 462 }
 463
 464 /**
 465  * qib_error_qp - put a QP into the error state
 466  * @qp: the QP to put into the error state
 467  * @err: the receive completion error to signal if a RWQE is active
 468  *
 469  * Flushes both send and receive work queues.
 470  * Returns true if last WQE event should be generated.
 471  * The QP r_lock and s_lock should be held and interrupts disabled.
 472  * If we are already in error state, just return.
 473  */
 474 int qib_error_qp(struct qib_qp *qp, enum ib_wc_status err)
 475 {
 476         struct qib_ibdev *dev = to_idev(qp->ibqp.device);
 477         struct ib_wc wc;
 478         int ret = 0;
 479
 480         if (qp->state == IB_QPS_ERR || qp->state == IB_QPS_RESET)
 481                 goto bail;
 482
 483         qp->state = IB_QPS_ERR;
 484
 485         if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
 486                 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
 487                 del_timer(&qp->s_timer);
 488         }
 489
 490         if (qp->s_flags & QIB_S_ANY_WAIT_SEND)
 491                 qp->s_flags &= ~QIB_S_ANY_WAIT_SEND;
 492
 493         spin_lock(&dev->pending_lock);
 494         if (!list_empty(&qp->iowait) && !(qp->s_flags & QIB_S_BUSY)) {
 495                 qp->s_flags &= ~QIB_S_ANY_WAIT_IO;
 496                 list_del_init(&qp->iowait);
 497         }
 498         spin_unlock(&dev->pending_lock);
 499
 500         if (!(qp->s_flags & QIB_S_BUSY)) {
 501                 qp->s_hdrwords = 0;
 502                 if (qp->s_rdma_mr) {
 503                         qib_put_mr(qp->s_rdma_mr);
 504                         qp->s_rdma_mr = NULL;
 505                 }
 506                 if (qp->s_tx) {
 507                         qib_put_txreq(qp->s_tx);
 508                         qp->s_tx = NULL;
 509                 }
 510         }
 511
 512         /* Schedule the sending tasklet to drain the send work queue. */
 513         if (qp->s_last != qp->s_head)
 514                 qib_schedule_send(qp);
 515
 516         clear_mr_refs(qp, 0);
 517
 518         memset(&wc, 0, sizeof(wc));
 519         wc.qp = &qp->ibqp;
 520         wc.opcode = IB_WC_RECV;
 521
 522         if (test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) {
 523                 wc.wr_id = qp->r_wr_id;
 524                 wc.status = err;
 525                 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
 526         }
 527         wc.status = IB_WC_WR_FLUSH_ERR;
 528
 529         if (qp->r_rq.wq) {
 530                 struct qib_rwq *wq;
 531                 u32 head;
 532                 u32 tail;
 533
 534                 spin_lock(&qp->r_rq.lock);
 535
 536                 /* sanity check pointers before trusting them */
 537                 wq = qp->r_rq.wq;
 538                 head = wq->head;
 539                 if (head >= qp->r_rq.size)
 540                         head = 0;
 541                 tail = wq->tail;
 542                 if (tail >= qp->r_rq.size)
 543                         tail = 0;
 544                 while (tail != head) {
 545                         wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id;
 546                         if (++tail >= qp->r_rq.size)
 547                                 tail = 0;
 548                         qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
 549                 }
 550                 wq->tail = tail;
 551
 552                 spin_unlock(&qp->r_rq.lock);
 553         } else if (qp->ibqp.event_handler)
 554                 ret = 1;
 555
 556 bail:
 557         return ret;
 558 }
 559
 560 /**
 561  * qib_modify_qp - modify the attributes of a queue pair
 562  * @ibqp: the queue pair who's attributes we're modifying
 563  * @attr: the new attributes
 564  * @attr_mask: the mask of attributes to modify
 565  * @udata: user data for libibverbs.so
 566  *
 567  * Returns 0 on success, otherwise returns an errno.
 568  */
 569 int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 570                   int attr_mask, struct ib_udata *udata)
 571 {
 572         struct qib_ibdev *dev = to_idev(ibqp->device);
 573         struct qib_qp *qp = to_iqp(ibqp);
 574         enum ib_qp_state cur_state, new_state;
 575         struct ib_event ev;
 576         int lastwqe = 0;
 577         int mig = 0;
 578         int ret;
 579         u32 pmtu = 0; /* for gcc warning only */
 580
 581         spin_lock_irq(&qp->r_lock);
 582         spin_lock(&qp->s_lock);
 583
 584         cur_state = attr_mask & IB_QP_CUR_STATE ?
 585                 attr->cur_qp_state : qp->state;
 586         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
 587
 588         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
 589                                 attr_mask, IB_LINK_LAYER_UNSPECIFIED))
 590                 goto inval;
 591
 592         if (attr_mask & IB_QP_AV) {
 593                 if (attr->ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
 594                         goto inval;
 595                 if (qib_check_ah(qp->ibqp.device, &attr->ah_attr))
 596                         goto inval;
 597         }
 598
 599         if (attr_mask & IB_QP_ALT_PATH) {
 600                 if (attr->alt_ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
 601                         goto inval;
 602                 if (qib_check_ah(qp->ibqp.device, &attr->alt_ah_attr))
 603                         goto inval;
 604                 if (attr->alt_pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
 605                         goto inval;
 606         }
 607
 608         if (attr_mask & IB_QP_PKEY_INDEX)
 609                 if (attr->pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
 610                         goto inval;
 611
 612         if (attr_mask & IB_QP_MIN_RNR_TIMER)
 613                 if (attr->min_rnr_timer > 31)
 614                         goto inval;
 615
 616         if (attr_mask & IB_QP_PORT)
 617                 if (qp->ibqp.qp_type == IB_QPT_SMI ||
 618                     qp->ibqp.qp_type == IB_QPT_GSI ||
 619                     attr->port_num == 0 ||
 620                     attr->port_num > ibqp->device->phys_port_cnt)
 621                         goto inval;
 622
 623         if (attr_mask & IB_QP_DEST_QPN)
 624                 if (attr->dest_qp_num > QIB_QPN_MASK)
 625                         goto inval;
 626
 627         if (attr_mask & IB_QP_RETRY_CNT)
 628                 if (attr->retry_cnt > 7)
 629                         goto inval;
 630
 631         if (attr_mask & IB_QP_RNR_RETRY)
 632                 if (attr->rnr_retry > 7)
 633                         goto inval;
 634
 635         /*
 636          * Don't allow invalid path_mtu values.  OK to set greater
 637          * than the active mtu (or even the max_cap, if we have tuned
 638          * that to a small mtu.  We'll set qp->path_mtu
 639          * to the lesser of requested attribute mtu and active,
 640          * for packetizing messages.
 641          * Note that the QP port has to be set in INIT and MTU in RTR.
 642          */
 643         if (attr_mask & IB_QP_PATH_MTU) {
 644                 struct qib_devdata *dd = dd_from_dev(dev);
 645                 int mtu, pidx = qp->port_num - 1;
 646
 647                 mtu = ib_mtu_enum_to_int(attr->path_mtu);
 648                 if (mtu == -1)
 649                         goto inval;
 650                 if (mtu > dd->pport[pidx].ibmtu) {
 651                         switch (dd->pport[pidx].ibmtu) {
 652                         case 4096:
 653                                 pmtu = IB_MTU_4096;
 654                                 break;
 655                         case 2048:
 656                                 pmtu = IB_MTU_2048;
 657                                 break;
 658                         case 1024:
 659                                 pmtu = IB_MTU_1024;
 660                                 break;
 661                         case 512:
 662                                 pmtu = IB_MTU_512;
 663                                 break;
 664                         case 256:
 665                                 pmtu = IB_MTU_256;
 666                                 break;
 667                         default:
 668                                 pmtu = IB_MTU_2048;
 669                         }
 670                 } else
 671                         pmtu = attr->path_mtu;
 672         }
 673
 674         if (attr_mask & IB_QP_PATH_MIG_STATE) {
 675                 if (attr->path_mig_state == IB_MIG_REARM) {
 676                         if (qp->s_mig_state == IB_MIG_ARMED)
 677                                 goto inval;
 678                         if (new_state != IB_QPS_RTS)
 679                                 goto inval;
 680                 } else if (attr->path_mig_state == IB_MIG_MIGRATED) {
 681                         if (qp->s_mig_state == IB_MIG_REARM)
 682                                 goto inval;
 683                         if (new_state != IB_QPS_RTS && new_state != IB_QPS_SQD)
 684                                 goto inval;
 685                         if (qp->s_mig_state == IB_MIG_ARMED)
 686                                 mig = 1;
 687                 } else
 688                         goto inval;
 689         }
 690
 691         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 692                 if (attr->max_dest_rd_atomic > QIB_MAX_RDMA_ATOMIC)
 693                         goto inval;
 694
 695         switch (new_state) {
 696         case IB_QPS_RESET:
 697                 if (qp->state != IB_QPS_RESET) {
 698                         qp->state = IB_QPS_RESET;
 699                         spin_lock(&dev->pending_lock);
 700                         if (!list_empty(&qp->iowait))
 701                                 list_del_init(&qp->iowait);
 702                         spin_unlock(&dev->pending_lock);
 703                         qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
 704                         spin_unlock(&qp->s_lock);
 705                         spin_unlock_irq(&qp->r_lock);
 706                         /* Stop the sending work queue and retry timer */
 707                         cancel_work_sync(&qp->s_work);
 708                         del_timer_sync(&qp->s_timer);
 709                         wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
 710                         if (qp->s_tx) {
 711                                 qib_put_txreq(qp->s_tx);
 712                                 qp->s_tx = NULL;
 713                         }
 714                         remove_qp(dev, qp);
 715                         wait_event(qp->wait, !atomic_read(&qp->refcount));
 716                         spin_lock_irq(&qp->r_lock);
 717                         spin_lock(&qp->s_lock);
 718                         clear_mr_refs(qp, 1);
 719                         qib_reset_qp(qp, ibqp->qp_type);
 720                 }
 721                 break;
 722
 723         case IB_QPS_RTR:
 724                 /* Allow event to retrigger if QP set to RTR more than once */
 725                 qp->r_flags &= ~QIB_R_COMM_EST;
 726                 qp->state = new_state;
 727                 break;
 728
 729         case IB_QPS_SQD:
 730                 qp->s_draining = qp->s_last != qp->s_cur;
 731                 qp->state = new_state;
 732                 break;
 733
 734         case IB_QPS_SQE:
 735                 if (qp->ibqp.qp_type == IB_QPT_RC)
 736                         goto inval;
 737                 qp->state = new_state;
 738                 break;
 739
 740         case IB_QPS_ERR:
 741                 lastwqe = qib_error_qp(qp, IB_WC_WR_FLUSH_ERR);
 742                 break;
 743
 744         default:
 745                 qp->state = new_state;
 746                 break;
 747         }
 748
 749         if (attr_mask & IB_QP_PKEY_INDEX)
 750                 qp->s_pkey_index = attr->pkey_index;
 751
 752         if (attr_mask & IB_QP_PORT)
 753                 qp->port_num = attr->port_num;
 754
 755         if (attr_mask & IB_QP_DEST_QPN)
 756                 qp->remote_qpn = attr->dest_qp_num;
 757
 758         if (attr_mask & IB_QP_SQ_PSN) {
 759                 qp->s_next_psn = attr->sq_psn & QIB_PSN_MASK;
 760                 qp->s_psn = qp->s_next_psn;
 761                 qp->s_sending_psn = qp->s_next_psn;
 762                 qp->s_last_psn = qp->s_next_psn - 1;
 763                 qp->s_sending_hpsn = qp->s_last_psn;
 764         }
 765
 766         if (attr_mask & IB_QP_RQ_PSN)
 767                 qp->r_psn = attr->rq_psn & QIB_PSN_MASK;
 768
 769         if (attr_mask & IB_QP_ACCESS_FLAGS)
 770                 qp->qp_access_flags = attr->qp_access_flags;
 771
 772         if (attr_mask & IB_QP_AV) {
 773                 qp->remote_ah_attr = attr->ah_attr;
 774                 qp->s_srate = attr->ah_attr.static_rate;
 775         }
 776
 777         if (attr_mask & IB_QP_ALT_PATH) {
 778                 qp->alt_ah_attr = attr->alt_ah_attr;
 779                 qp->s_alt_pkey_index = attr->alt_pkey_index;
 780         }
 781
 782         if (attr_mask & IB_QP_PATH_MIG_STATE) {
 783                 qp->s_mig_state = attr->path_mig_state;
 784                 if (mig) {
 785                         qp->remote_ah_attr = qp->alt_ah_attr;
 786                         qp->port_num = qp->alt_ah_attr.port_num;
 787                         qp->s_pkey_index = qp->s_alt_pkey_index;
 788                 }
 789         }
 790
 791         if (attr_mask & IB_QP_PATH_MTU) {
 792                 qp->path_mtu = pmtu;
 793                 qp->pmtu = ib_mtu_enum_to_int(pmtu);
 794         }
 795
 796         if (attr_mask & IB_QP_RETRY_CNT) {
 797                 qp->s_retry_cnt = attr->retry_cnt;
 798                 qp->s_retry = attr->retry_cnt;
 799         }
 800
 801         if (attr_mask & IB_QP_RNR_RETRY) {
 802                 qp->s_rnr_retry_cnt = attr->rnr_retry;
 803                 qp->s_rnr_retry = attr->rnr_retry;
 804         }
 805
 806         if (attr_mask & IB_QP_MIN_RNR_TIMER)
 807                 qp->r_min_rnr_timer = attr->min_rnr_timer;
 808
 809         if (attr_mask & IB_QP_TIMEOUT) {
 810                 qp->timeout = attr->timeout;
 811                 qp->timeout_jiffies =
 812                         usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
 813                                 1000UL);
 814         }
 815
 816         if (attr_mask & IB_QP_QKEY)
 817                 qp->qkey = attr->qkey;
 818
 819         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 820                 qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
 821
 822         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
 823                 qp->s_max_rd_atomic = attr->max_rd_atomic;
 824
 825         spin_unlock(&qp->s_lock);
 826         spin_unlock_irq(&qp->r_lock);
 827
 828         if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
 829                 insert_qp(dev, qp);
 830
 831         if (lastwqe) {
 832                 ev.device = qp->ibqp.device;
 833                 ev.element.qp = &qp->ibqp;
 834                 ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
 835                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 836         }
 837         if (mig) {
 838                 ev.device = qp->ibqp.device;
 839                 ev.element.qp = &qp->ibqp;
 840                 ev.event = IB_EVENT_PATH_MIG;
 841                 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
 842         }
 843         ret = 0;
 844         goto bail;
 845
 846 inval:
 847         spin_unlock(&qp->s_lock);
 848         spin_unlock_irq(&qp->r_lock);
 849         ret = -EINVAL;
 850
 851 bail:
 852         return ret;
 853 }
 854
 855 int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 856                  int attr_mask, struct ib_qp_init_attr *init_attr)
 857 {
 858         struct qib_qp *qp = to_iqp(ibqp);
 859
 860         attr->qp_state = qp->state;
 861         attr->cur_qp_state = attr->qp_state;
 862         attr->path_mtu = qp->path_mtu;
 863         attr->path_mig_state = qp->s_mig_state;
 864         attr->qkey = qp->qkey;
 865         attr->rq_psn = qp->r_psn & QIB_PSN_MASK;
 866         attr->sq_psn = qp->s_next_psn & QIB_PSN_MASK;
 867         attr->dest_qp_num = qp->remote_qpn;
 868         attr->qp_access_flags = qp->qp_access_flags;
 869         attr->cap.max_send_wr = qp->s_size - 1;
 870         attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1;
 871         attr->cap.max_send_sge = qp->s_max_sge;
 872         attr->cap.max_recv_sge = qp->r_rq.max_sge;
 873         attr->cap.max_inline_data = 0;
 874         attr->ah_attr = qp->remote_ah_attr;
 875         attr->alt_ah_attr = qp->alt_ah_attr;
 876         attr->pkey_index = qp->s_pkey_index;
 877         attr->alt_pkey_index = qp->s_alt_pkey_index;
 878         attr->en_sqd_async_notify = 0;
 879         attr->sq_draining = qp->s_draining;
 880         attr->max_rd_atomic = qp->s_max_rd_atomic;
 881         attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
 882         attr->min_rnr_timer = qp->r_min_rnr_timer;
 883         attr->port_num = qp->port_num;
 884         attr->timeout = qp->timeout;
 885         attr->retry_cnt = qp->s_retry_cnt;
 886         attr->rnr_retry = qp->s_rnr_retry_cnt;
 887         attr->alt_port_num = qp->alt_ah_attr.port_num;
 888         attr->alt_timeout = qp->alt_timeout;
 889
 890         init_attr->event_handler = qp->ibqp.event_handler;
 891         init_attr->qp_context = qp->ibqp.qp_context;
 892         init_attr->send_cq = qp->ibqp.send_cq;
 893         init_attr->recv_cq = qp->ibqp.recv_cq;
 894         init_attr->srq = qp->ibqp.srq;
 895         init_attr->cap = attr->cap;
 896         if (qp->s_flags & QIB_S_SIGNAL_REQ_WR)
 897                 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
 898         else
 899                 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
 900         init_attr->qp_type = qp->ibqp.qp_type;
 901         init_attr->port_num = qp->port_num;
 902         return 0;
 903 }
 904
 905 /**
 906  * qib_compute_aeth - compute the AETH (syndrome + MSN)
 907  * @qp: the queue pair to compute the AETH for
 908  *
 909  * Returns the AETH.
 910  */
 911 __be32 qib_compute_aeth(struct qib_qp *qp)
 912 {
 913         u32 aeth = qp->r_msn & QIB_MSN_MASK;
 914
 915         if (qp->ibqp.srq) {
 916                 /*
 917                  * Shared receive queues don't generate credits.
 918                  * Set the credit field to the invalid value.
 919                  */
 920                 aeth |= QIB_AETH_CREDIT_INVAL << QIB_AETH_CREDIT_SHIFT;
 921         } else {
 922                 u32 min, max, x;
 923                 u32 credits;
 924                 struct qib_rwq *wq = qp->r_rq.wq;
 925                 u32 head;
 926                 u32 tail;
 927
 928                 /* sanity check pointers before trusting them */
 929                 head = wq->head;
 930                 if (head >= qp->r_rq.size)
 931                         head = 0;
 932                 tail = wq->tail;
 933                 if (tail >= qp->r_rq.size)
 934                         tail = 0;
 935                 /*
 936                  * Compute the number of credits available (RWQEs).
 937                  * XXX Not holding the r_rq.lock here so there is a small
 938                  * chance that the pair of reads are not atomic.
 939                  */
 940                 credits = head - tail;
 941                 if ((int)credits < 0)
 942                         credits += qp->r_rq.size;
 943                 /*
 944                  * Binary search the credit table to find the code to
 945                  * use.
 946                  */
 947                 min = 0;
 948                 max = 31;
 949                 for (;;) {
 950                         x = (min + max) / 2;
 951                         if (credit_table[x] == credits)
 952                                 break;
 953                         if (credit_table[x] > credits)
 954                                 max = x;
 955                         else if (min == x)
 956                                 break;
 957                         else
 958                                 min = x;
 959                 }
 960                 aeth |= x << QIB_AETH_CREDIT_SHIFT;
 961         }
 962         return cpu_to_be32(aeth);
 963 }
 964
 965 /**
 966  * qib_create_qp - create a queue pair for a device
 967  * @ibpd: the protection domain who's device we create the queue pair for
 968  * @init_attr: the attributes of the queue pair
 969  * @udata: user data for libibverbs.so
 970  *
 971  * Returns the queue pair on success, otherwise returns an errno.
 972  *
 973  * Called by the ib_create_qp() core verbs function.
 974  */
 975 struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
 976                             struct ib_qp_init_attr *init_attr,
 977                             struct ib_udata *udata)
 978 {
 979         struct qib_qp *qp;
 980         int err;
 981         struct qib_swqe *swq = NULL;
 982         struct qib_ibdev *dev;
 983         struct qib_devdata *dd;
 984         size_t sz;
 985         size_t sg_list_sz;
 986         struct ib_qp *ret;
 987         gfp_t gfp;
 988
 989
 990         if (init_attr->cap.max_send_sge > ib_qib_max_sges ||
 991             init_attr->cap.max_send_wr > ib_qib_max_qp_wrs ||
 992             init_attr->create_flags & ~(IB_QP_CREATE_USE_GFP_NOIO))
 993                 return ERR_PTR(-EINVAL);
 994
 995         /* GFP_NOIO is applicable in RC QPs only */
 996         if (init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO &&
 997             init_attr->qp_type != IB_QPT_RC)
 998                 return ERR_PTR(-EINVAL);
 999
1000         gfp = init_attr->create_flags & IB_QP_CREATE_USE_GFP_NOIO ?
1001                         GFP_NOIO : GFP_KERNEL;
1002
1003         /* Check receive queue parameters if no SRQ is specified. */
1004         if (!init_attr->srq) {
1005                 if (init_attr->cap.max_recv_sge > ib_qib_max_sges ||
1006                     init_attr->cap.max_recv_wr > ib_qib_max_qp_wrs) {
1007                         ret = ERR_PTR(-EINVAL);
1008                         goto bail;
1009                 }
1010                 if (init_attr->cap.max_send_sge +
1011                     init_attr->cap.max_send_wr +
1012                     init_attr->cap.max_recv_sge +
1013                     init_attr->cap.max_recv_wr == 0) {
1014                         ret = ERR_PTR(-EINVAL);
1015                         goto bail;
1016                 }
1017         }
1018
1019         switch (init_attr->qp_type) {
1020         case IB_QPT_SMI:
1021         case IB_QPT_GSI:
1022                 if (init_attr->port_num == 0 ||
1023                     init_attr->port_num > ibpd->device->phys_port_cnt) {
1024                         ret = ERR_PTR(-EINVAL);
1025                         goto bail;
1026                 }
1027         case IB_QPT_UC:
1028         case IB_QPT_RC:
1029         case IB_QPT_UD:
1030                 sz = sizeof(struct qib_sge) *
1031                         init_attr->cap.max_send_sge +
1032                         sizeof(struct qib_swqe);
1033                 swq = __vmalloc((init_attr->cap.max_send_wr + 1) * sz,
1034                                 gfp, PAGE_KERNEL);
1035                 if (swq == NULL) {
1036                         ret = ERR_PTR(-ENOMEM);
1037                         goto bail;
1038                 }
1039                 sz = sizeof(*qp);
1040                 sg_list_sz = 0;
1041                 if (init_attr->srq) {
1042                         struct qib_srq *srq = to_isrq(init_attr->srq);
1043
1044                         if (srq->rq.max_sge > 1)
1045                                 sg_list_sz = sizeof(*qp->r_sg_list) *
1046                                         (srq->rq.max_sge - 1);
1047                 } else if (init_attr->cap.max_recv_sge > 1)
1048                         sg_list_sz = sizeof(*qp->r_sg_list) *
1049                                 (init_attr->cap.max_recv_sge - 1);
1050                 qp = kzalloc(sz + sg_list_sz, gfp);
1051                 if (!qp) {
1052                         ret = ERR_PTR(-ENOMEM);
1053                         goto bail_swq;
1054                 }
1055                 RCU_INIT_POINTER(qp->next, NULL);
1056                 qp->s_hdr = kzalloc(sizeof(*qp->s_hdr), gfp);
1057                 if (!qp->s_hdr) {
1058                         ret = ERR_PTR(-ENOMEM);
1059                         goto bail_qp;
1060                 }
1061                 qp->timeout_jiffies =
1062                         usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
1063                                 1000UL);
1064                 if (init_attr->srq)
1065                         sz = 0;
1066                 else {
1067                         qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
1068                         qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
1069                         sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
1070                                 sizeof(struct qib_rwqe);
1071                         if (gfp != GFP_NOIO)
1072                                 qp->r_rq.wq = vmalloc_user(
1073                                                 sizeof(struct qib_rwq) +
1074                                                 qp->r_rq.size * sz);
1075                         else
1076                                 qp->r_rq.wq = __vmalloc(
1077                                                 sizeof(struct qib_rwq) +
1078                                                 qp->r_rq.size * sz,
1079                                                 gfp, PAGE_KERNEL);
1080
1081                         if (!qp->r_rq.wq) {
1082                                 ret = ERR_PTR(-ENOMEM);
1083                                 goto bail_qp;
1084                         }
1085                 }
1086
1087                 /*
1088                  * ib_create_qp() will initialize qp->ibqp
1089                  * except for qp->ibqp.qp_num.
1090                  */
1091                 spin_lock_init(&qp->r_lock);
1092                 spin_lock_init(&qp->s_lock);
1093                 spin_lock_init(&qp->r_rq.lock);
1094                 atomic_set(&qp->refcount, 0);
1095                 init_waitqueue_head(&qp->wait);
1096                 init_waitqueue_head(&qp->wait_dma);
1097                 init_timer(&qp->s_timer);
1098                 qp->s_timer.data = (unsigned long)qp;
1099                 INIT_WORK(&qp->s_work, qib_do_send);
1100                 INIT_LIST_HEAD(&qp->iowait);
1101                 INIT_LIST_HEAD(&qp->rspwait);
1102                 qp->state = IB_QPS_RESET;
1103                 qp->s_wq = swq;
1104                 qp->s_size = init_attr->cap.max_send_wr + 1;
1105                 qp->s_max_sge = init_attr->cap.max_send_sge;
1106                 if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
1107                         qp->s_flags = QIB_S_SIGNAL_REQ_WR;
1108                 dev = to_idev(ibpd->device);
1109                 dd = dd_from_dev(dev);
1110                 err = alloc_qpn(dd, &dev->qpn_table, init_attr->qp_type,
1111                                 init_attr->port_num, gfp);
1112                 if (err < 0) {
1113                         ret = ERR_PTR(err);
1114                         vfree(qp->r_rq.wq);
1115                         goto bail_qp;
1116                 }
1117                 qp->ibqp.qp_num = err;
1118                 qp->port_num = init_attr->port_num;
1119                 qib_reset_qp(qp, init_attr->qp_type);
1120                 break;
1121
1122         default:
1123                 /* Don't support raw QPs */
1124                 ret = ERR_PTR(-ENOSYS);
1125                 goto bail;
1126         }
1127
1128         init_attr->cap.max_inline_data = 0;
1129
1130         /*
1131          * Return the address of the RWQ as the offset to mmap.
1132          * See qib_mmap() for details.
1133          */
1134         if (udata && udata->outlen >= sizeof(__u64)) {
1135                 if (!qp->r_rq.wq) {
1136                         __u64 offset = 0;
1137
1138                         err = ib_copy_to_udata(udata, &offset,
1139                                                sizeof(offset));
1140                         if (err) {
1141                                 ret = ERR_PTR(err);
1142                                 goto bail_ip;
1143                         }
1144                 } else {
1145                         u32 s = sizeof(struct qib_rwq) + qp->r_rq.size * sz;
1146
1147                         qp->ip = qib_create_mmap_info(dev, s,
1148                                                       ibpd->uobject->context,
1149                                                       qp->r_rq.wq);
1150                         if (!qp->ip) {
1151                                 ret = ERR_PTR(-ENOMEM);
1152                                 goto bail_ip;
1153                         }
1154
1155                         err = ib_copy_to_udata(udata, &(qp->ip->offset),
1156                                                sizeof(qp->ip->offset));
1157                         if (err) {
1158                                 ret = ERR_PTR(err);
1159                                 goto bail_ip;
1160                         }
1161                 }
1162         }
1163
1164         spin_lock(&dev->n_qps_lock);
1165         if (dev->n_qps_allocated == ib_qib_max_qps) {
1166                 spin_unlock(&dev->n_qps_lock);
1167                 ret = ERR_PTR(-ENOMEM);
1168                 goto bail_ip;
1169         }
1170
1171         dev->n_qps_allocated++;
1172         spin_unlock(&dev->n_qps_lock);
1173
1174         if (qp->ip) {
1175                 spin_lock_irq(&dev->pending_lock);
1176                 list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps);
1177                 spin_unlock_irq(&dev->pending_lock);
1178         }
1179
1180         ret = &qp->ibqp;
1181         goto bail;
1182
1183 bail_ip:
1184         if (qp->ip)
1185                 kref_put(&qp->ip->ref, qib_release_mmap_info);
1186         else
1187                 vfree(qp->r_rq.wq);
1188         free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
1189 bail_qp:
1190         kfree(qp->s_hdr);
1191         kfree(qp);
1192 bail_swq:
1193         vfree(swq);
1194 bail:
1195         return ret;
1196 }
1197
1198 /**
1199  * qib_destroy_qp - destroy a queue pair
1200  * @ibqp: the queue pair to destroy
1201  *
1202  * Returns 0 on success.
1203  *
1204  * Note that this can be called while the QP is actively sending or
1205  * receiving!
1206  */
1207 int qib_destroy_qp(struct ib_qp *ibqp)
1208 {
1209         struct qib_qp *qp = to_iqp(ibqp);
1210         struct qib_ibdev *dev = to_idev(ibqp->device);
1211
1212         /* Make sure HW and driver activity is stopped. */
1213         spin_lock_irq(&qp->s_lock);
1214         if (qp->state != IB_QPS_RESET) {
1215                 qp->state = IB_QPS_RESET;
1216                 spin_lock(&dev->pending_lock);
1217                 if (!list_empty(&qp->iowait))
1218                         list_del_init(&qp->iowait);
1219                 spin_unlock(&dev->pending_lock);
1220                 qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
1221                 spin_unlock_irq(&qp->s_lock);
1222                 cancel_work_sync(&qp->s_work);
1223                 del_timer_sync(&qp->s_timer);
1224                 wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
1225                 if (qp->s_tx) {
1226                         qib_put_txreq(qp->s_tx);
1227                         qp->s_tx = NULL;
1228                 }
1229                 remove_qp(dev, qp);
1230                 wait_event(qp->wait, !atomic_read(&qp->refcount));
1231                 clear_mr_refs(qp, 1);
1232         } else
1233                 spin_unlock_irq(&qp->s_lock);
1234
1235         /* all user's cleaned up, mark it available */
1236         free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
1237         spin_lock(&dev->n_qps_lock);
1238         dev->n_qps_allocated--;
1239         spin_unlock(&dev->n_qps_lock);
1240
1241         if (qp->ip)
1242                 kref_put(&qp->ip->ref, qib_release_mmap_info);
1243         else
1244                 vfree(qp->r_rq.wq);
1245         vfree(qp->s_wq);
1246         kfree(qp->s_hdr);
1247         kfree(qp);
1248         return 0;
1249 }
1250
1251 /**
1252  * qib_init_qpn_table - initialize the QP number table for a device
1253  * @qpt: the QPN table
1254  */
1255 void qib_init_qpn_table(struct qib_devdata *dd, struct qib_qpn_table *qpt)
1256 {
1257         spin_lock_init(&qpt->lock);
1258         qpt->last = 1;          /* start with QPN 2 */
1259         qpt->nmaps = 1;
1260         qpt->mask = dd->qpn_mask;
1261 }
1262
1263 /**
1264  * qib_free_qpn_table - free the QP number table for a device
1265  * @qpt: the QPN table
1266  */
1267 void qib_free_qpn_table(struct qib_qpn_table *qpt)
1268 {
1269         int i;
1270
1271         for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
1272                 if (qpt->map[i].page)
1273                         free_page((unsigned long) qpt->map[i].page);
1274 }
1275
1276 /**
1277  * qib_get_credit - flush the send work queue of a QP
1278  * @qp: the qp who's send work queue to flush
1279  * @aeth: the Acknowledge Extended Transport Header
1280  *
1281  * The QP s_lock should be held.
1282  */
1283 void qib_get_credit(struct qib_qp *qp, u32 aeth)
1284 {
1285         u32 credit = (aeth >> QIB_AETH_CREDIT_SHIFT) & QIB_AETH_CREDIT_MASK;
1286
1287         /*
1288          * If the credit is invalid, we can send
1289          * as many packets as we like.  Otherwise, we have to
1290          * honor the credit field.
1291          */
1292         if (credit == QIB_AETH_CREDIT_INVAL) {
1293                 if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
1294                         qp->s_flags |= QIB_S_UNLIMITED_CREDIT;
1295                         if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
1296                                 qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
1297                                 qib_schedule_send(qp);
1298                         }
1299                 }
1300         } else if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
1301                 /* Compute new LSN (i.e., MSN + credit) */
1302                 credit = (aeth + credit_table[credit]) & QIB_MSN_MASK;
1303                 if (qib_cmp24(credit, qp->s_lsn) > 0) {
1304                         qp->s_lsn = credit;
1305                         if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
1306                                 qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
1307                                 qib_schedule_send(qp);
1308                         }
1309                 }
1310         }
1311 }
1312
1313 #ifdef CONFIG_DEBUG_FS
1314
1315 struct qib_qp_iter {
1316         struct qib_ibdev *dev;
1317         struct qib_qp *qp;
1318         int n;
1319 };
1320
1321 struct qib_qp_iter *qib_qp_iter_init(struct qib_ibdev *dev)
1322 {
1323         struct qib_qp_iter *iter;
1324
1325         iter = kzalloc(sizeof(*iter), GFP_KERNEL);
1326         if (!iter)
1327                 return NULL;
1328
1329         iter->dev = dev;
1330         if (qib_qp_iter_next(iter)) {
1331                 kfree(iter);
1332                 return NULL;
1333         }
1334
1335         return iter;
1336 }
1337
1338 int qib_qp_iter_next(struct qib_qp_iter *iter)
1339 {
1340         struct qib_ibdev *dev = iter->dev;
1341         int n = iter->n;
1342         int ret = 1;
1343         struct qib_qp *pqp = iter->qp;
1344         struct qib_qp *qp;
1345
1346         for (; n < dev->qp_table_size; n++) {
1347                 if (pqp)
1348                         qp = rcu_dereference(pqp->next);
1349                 else
1350                         qp = rcu_dereference(dev->qp_table[n]);
1351                 pqp = qp;
1352                 if (qp) {
1353                         iter->qp = qp;
1354                         iter->n = n;
1355                         return 0;
1356                 }
1357         }
1358         return ret;
1359 }
1360
1361 static const char * const qp_type_str[] = {
1362         "SMI", "GSI", "RC", "UC", "UD",
1363 };
1364
1365 void qib_qp_iter_print(struct seq_file *s, struct qib_qp_iter *iter)
1366 {
1367         struct qib_swqe *wqe;
1368         struct qib_qp *qp = iter->qp;
1369
1370         wqe = get_swqe_ptr(qp, qp->s_last);
1371         seq_printf(s,
1372                    "N %d QP%u %s %u %u %u f=%x %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u) QP%u LID %x\n",
1373                    iter->n,
1374                    qp->ibqp.qp_num,
1375                    qp_type_str[qp->ibqp.qp_type],
1376                    qp->state,
1377                    wqe->wr.opcode,
1378                    qp->s_hdrwords,
1379                    qp->s_flags,
1380                    atomic_read(&qp->s_dma_busy),
1381                    !list_empty(&qp->iowait),
1382                    qp->timeout,
1383                    wqe->ssn,
1384                    qp->s_lsn,
1385                    qp->s_last_psn,
1386                    qp->s_psn, qp->s_next_psn,
1387                    qp->s_sending_psn, qp->s_sending_hpsn,
1388                    qp->s_last, qp->s_acked, qp->s_cur,
1389                    qp->s_tail, qp->s_head, qp->s_size,
1390                    qp->remote_qpn,
1391                    qp->remote_ah_attr.dlid);
1392 }
1393
1394 #endif