drivers/infiniband/hw/ipath/ipath_verbs.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
   3  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <rdma/ib_mad.h>
  35 #include <rdma/ib_user_verbs.h>
  36 #include <linux/io.h>
  37 #include <linux/utsname.h>
  38
  39 #include "ipath_kernel.h"
  40 #include "ipath_verbs.h"
  41 #include "ipath_common.h"
  42
  43 static unsigned int ib_ipath_qp_table_size = 251;
  44 module_param_named(qp_table_size, ib_ipath_qp_table_size, uint, S_IRUGO);
  45 MODULE_PARM_DESC(qp_table_size, "QP table size");
  46
  47 unsigned int ib_ipath_lkey_table_size = 12;
  48 module_param_named(lkey_table_size, ib_ipath_lkey_table_size, uint,
  49                    S_IRUGO);
  50 MODULE_PARM_DESC(lkey_table_size,
  51                  "LKEY table size in bits (2^n, 1 <= n <= 23)");
  52
  53 static unsigned int ib_ipath_max_pds = 0xFFFF;
  54 module_param_named(max_pds, ib_ipath_max_pds, uint, S_IWUSR | S_IRUGO);
  55 MODULE_PARM_DESC(max_pds,
  56                  "Maximum number of protection domains to support");
  57
  58 static unsigned int ib_ipath_max_ahs = 0xFFFF;
  59 module_param_named(max_ahs, ib_ipath_max_ahs, uint, S_IWUSR | S_IRUGO);
  60 MODULE_PARM_DESC(max_ahs, "Maximum number of address handles to support");
  61
  62 unsigned int ib_ipath_max_cqes = 0x2FFFF;
  63 module_param_named(max_cqes, ib_ipath_max_cqes, uint, S_IWUSR | S_IRUGO);
  64 MODULE_PARM_DESC(max_cqes,
  65                  "Maximum number of completion queue entries to support");
  66
  67 unsigned int ib_ipath_max_cqs = 0x1FFFF;
  68 module_param_named(max_cqs, ib_ipath_max_cqs, uint, S_IWUSR | S_IRUGO);
  69 MODULE_PARM_DESC(max_cqs, "Maximum number of completion queues to support");
  70
  71 unsigned int ib_ipath_max_qp_wrs = 0x3FFF;
  72 module_param_named(max_qp_wrs, ib_ipath_max_qp_wrs, uint,
  73                    S_IWUSR | S_IRUGO);
  74 MODULE_PARM_DESC(max_qp_wrs, "Maximum number of QP WRs to support");
  75
  76 unsigned int ib_ipath_max_qps = 16384;
  77 module_param_named(max_qps, ib_ipath_max_qps, uint, S_IWUSR | S_IRUGO);
  78 MODULE_PARM_DESC(max_qps, "Maximum number of QPs to support");
  79
  80 unsigned int ib_ipath_max_sges = 0x60;
  81 module_param_named(max_sges, ib_ipath_max_sges, uint, S_IWUSR | S_IRUGO);
  82 MODULE_PARM_DESC(max_sges, "Maximum number of SGEs to support");
  83
  84 unsigned int ib_ipath_max_mcast_grps = 16384;
  85 module_param_named(max_mcast_grps, ib_ipath_max_mcast_grps, uint,
  86                    S_IWUSR | S_IRUGO);
  87 MODULE_PARM_DESC(max_mcast_grps,
  88                  "Maximum number of multicast groups to support");
  89
  90 unsigned int ib_ipath_max_mcast_qp_attached = 16;
  91 module_param_named(max_mcast_qp_attached, ib_ipath_max_mcast_qp_attached,
  92                    uint, S_IWUSR | S_IRUGO);
  93 MODULE_PARM_DESC(max_mcast_qp_attached,
  94                  "Maximum number of attached QPs to support");
  95
  96 unsigned int ib_ipath_max_srqs = 1024;
  97 module_param_named(max_srqs, ib_ipath_max_srqs, uint, S_IWUSR | S_IRUGO);
  98 MODULE_PARM_DESC(max_srqs, "Maximum number of SRQs to support");
  99
 100 unsigned int ib_ipath_max_srq_sges = 128;
 101 module_param_named(max_srq_sges, ib_ipath_max_srq_sges,
 102                    uint, S_IWUSR | S_IRUGO);
 103 MODULE_PARM_DESC(max_srq_sges, "Maximum number of SRQ SGEs to support");
 104
 105 unsigned int ib_ipath_max_srq_wrs = 0x1FFFF;
 106 module_param_named(max_srq_wrs, ib_ipath_max_srq_wrs,
 107                    uint, S_IWUSR | S_IRUGO);
 108 MODULE_PARM_DESC(max_srq_wrs, "Maximum number of SRQ WRs support");
 109
 110 static unsigned int ib_ipath_disable_sma;
 111 module_param_named(disable_sma, ib_ipath_disable_sma, uint, S_IWUSR | S_IRUGO);
 112 MODULE_PARM_DESC(ib_ipath_disable_sma, "Disable the SMA");
 113
 114 const int ib_ipath_state_ops[IB_QPS_ERR + 1] = {
 115         [IB_QPS_RESET] = 0,
 116         [IB_QPS_INIT] = IPATH_POST_RECV_OK,
 117         [IB_QPS_RTR] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK,
 118         [IB_QPS_RTS] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
 119             IPATH_POST_SEND_OK | IPATH_PROCESS_SEND_OK,
 120         [IB_QPS_SQD] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
 121             IPATH_POST_SEND_OK,
 122         [IB_QPS_SQE] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK,
 123         [IB_QPS_ERR] = 0,
 124 };
 125
 126 struct ipath_ucontext {
 127         struct ib_ucontext ibucontext;
 128 };
 129
 130 static inline struct ipath_ucontext *to_iucontext(struct ib_ucontext
 131                                                   *ibucontext)
 132 {
 133         return container_of(ibucontext, struct ipath_ucontext, ibucontext);
 134 }
 135
 136 /*
 137  * Translate ib_wr_opcode into ib_wc_opcode.
 138  */
 139 const enum ib_wc_opcode ib_ipath_wc_opcode[] = {
 140         [IB_WR_RDMA_WRITE] = IB_WC_RDMA_WRITE,
 141         [IB_WR_RDMA_WRITE_WITH_IMM] = IB_WC_RDMA_WRITE,
 142         [IB_WR_SEND] = IB_WC_SEND,
 143         [IB_WR_SEND_WITH_IMM] = IB_WC_SEND,
 144         [IB_WR_RDMA_READ] = IB_WC_RDMA_READ,
 145         [IB_WR_ATOMIC_CMP_AND_SWP] = IB_WC_COMP_SWAP,
 146         [IB_WR_ATOMIC_FETCH_AND_ADD] = IB_WC_FETCH_ADD
 147 };
 148
 149 /*
 150  * System image GUID.
 151  */
 152 static __be64 sys_image_guid;
 153
 154 /**
 155  * ipath_copy_sge - copy data to SGE memory
 156  * @ss: the SGE state
 157  * @data: the data to copy
 158  * @length: the length of the data
 159  */
 160 void ipath_copy_sge(struct ipath_sge_state *ss, void *data, u32 length)
 161 {
 162         struct ipath_sge *sge = &ss->sge;
 163
 164         while (length) {
 165                 u32 len = sge->length;
 166
 167                 if (len > length)
 168                         len = length;
 169                 if (len > sge->sge_length)
 170                         len = sge->sge_length;
 171                 BUG_ON(len == 0);
 172                 memcpy(sge->vaddr, data, len);
 173                 sge->vaddr += len;
 174                 sge->length -= len;
 175                 sge->sge_length -= len;
 176                 if (sge->sge_length == 0) {
 177                         if (--ss->num_sge)
 178                                 *sge = *ss->sg_list++;
 179                 } else if (sge->length == 0 && sge->mr != NULL) {
 180                         if (++sge->n >= IPATH_SEGSZ) {
 181                                 if (++sge->m >= sge->mr->mapsz)
 182                                         break;
 183                                 sge->n = 0;
 184                         }
 185                         sge->vaddr =
 186                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 187                         sge->length =
 188                                 sge->mr->map[sge->m]->segs[sge->n].length;
 189                 }
 190                 data += len;
 191                 length -= len;
 192         }
 193 }
 194
 195 /**
 196  * ipath_skip_sge - skip over SGE memory - XXX almost dup of prev func
 197  * @ss: the SGE state
 198  * @length: the number of bytes to skip
 199  */
 200 void ipath_skip_sge(struct ipath_sge_state *ss, u32 length)
 201 {
 202         struct ipath_sge *sge = &ss->sge;
 203
 204         while (length) {
 205                 u32 len = sge->length;
 206
 207                 if (len > length)
 208                         len = length;
 209                 if (len > sge->sge_length)
 210                         len = sge->sge_length;
 211                 BUG_ON(len == 0);
 212                 sge->vaddr += len;
 213                 sge->length -= len;
 214                 sge->sge_length -= len;
 215                 if (sge->sge_length == 0) {
 216                         if (--ss->num_sge)
 217                                 *sge = *ss->sg_list++;
 218                 } else if (sge->length == 0 && sge->mr != NULL) {
 219                         if (++sge->n >= IPATH_SEGSZ) {
 220                                 if (++sge->m >= sge->mr->mapsz)
 221                                         break;
 222                                 sge->n = 0;
 223                         }
 224                         sge->vaddr =
 225                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 226                         sge->length =
 227                                 sge->mr->map[sge->m]->segs[sge->n].length;
 228                 }
 229                 length -= len;
 230         }
 231 }
 232
 233 /**
 234  * ipath_post_send - post a send on a QP
 235  * @ibqp: the QP to post the send on
 236  * @wr: the list of work requests to post
 237  * @bad_wr: the first bad WR is put here
 238  *
 239  * This may be called from interrupt context.
 240  */
 241 static int ipath_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 242                            struct ib_send_wr **bad_wr)
 243 {
 244         struct ipath_qp *qp = to_iqp(ibqp);
 245         int err = 0;
 246
 247         /* Check that state is OK to post send. */
 248         if (!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK)) {
 249                 *bad_wr = wr;
 250                 err = -EINVAL;
 251                 goto bail;
 252         }
 253
 254         for (; wr; wr = wr->next) {
 255                 switch (qp->ibqp.qp_type) {
 256                 case IB_QPT_UC:
 257                 case IB_QPT_RC:
 258                         err = ipath_post_ruc_send(qp, wr);
 259                         break;
 260
 261                 case IB_QPT_SMI:
 262                 case IB_QPT_GSI:
 263                 case IB_QPT_UD:
 264                         err = ipath_post_ud_send(qp, wr);
 265                         break;
 266
 267                 default:
 268                         err = -EINVAL;
 269                 }
 270                 if (err) {
 271                         *bad_wr = wr;
 272                         break;
 273                 }
 274         }
 275
 276 bail:
 277         return err;
 278 }
 279
 280 /**
 281  * ipath_post_receive - post a receive on a QP
 282  * @ibqp: the QP to post the receive on
 283  * @wr: the WR to post
 284  * @bad_wr: the first bad WR is put here
 285  *
 286  * This may be called from interrupt context.
 287  */
 288 static int ipath_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 289                               struct ib_recv_wr **bad_wr)
 290 {
 291         struct ipath_qp *qp = to_iqp(ibqp);
 292         struct ipath_rwq *wq = qp->r_rq.wq;
 293         unsigned long flags;
 294         int ret;
 295
 296         /* Check that state is OK to post receive. */
 297         if (!(ib_ipath_state_ops[qp->state] & IPATH_POST_RECV_OK) || !wq) {
 298                 *bad_wr = wr;
 299                 ret = -EINVAL;
 300                 goto bail;
 301         }
 302
 303         for (; wr; wr = wr->next) {
 304                 struct ipath_rwqe *wqe;
 305                 u32 next;
 306                 int i;
 307
 308                 if ((unsigned) wr->num_sge > qp->r_rq.max_sge) {
 309                         *bad_wr = wr;
 310                         ret = -ENOMEM;
 311                         goto bail;
 312                 }
 313
 314                 spin_lock_irqsave(&qp->r_rq.lock, flags);
 315                 next = wq->head + 1;
 316                 if (next >= qp->r_rq.size)
 317                         next = 0;
 318                 if (next == wq->tail) {
 319                         spin_unlock_irqrestore(&qp->r_rq.lock, flags);
 320                         *bad_wr = wr;
 321                         ret = -ENOMEM;
 322                         goto bail;
 323                 }
 324
 325                 wqe = get_rwqe_ptr(&qp->r_rq, wq->head);
 326                 wqe->wr_id = wr->wr_id;
 327                 wqe->num_sge = wr->num_sge;
 328                 for (i = 0; i < wr->num_sge; i++)
 329                         wqe->sg_list[i] = wr->sg_list[i];
 330                 wq->head = next;
 331                 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
 332         }
 333         ret = 0;
 334
 335 bail:
 336         return ret;
 337 }
 338
 339 /**
 340  * ipath_qp_rcv - processing an incoming packet on a QP
 341  * @dev: the device the packet came on
 342  * @hdr: the packet header
 343  * @has_grh: true if the packet has a GRH
 344  * @data: the packet data
 345  * @tlen: the packet length
 346  * @qp: the QP the packet came on
 347  *
 348  * This is called from ipath_ib_rcv() to process an incoming packet
 349  * for the given QP.
 350  * Called at interrupt level.
 351  */
 352 static void ipath_qp_rcv(struct ipath_ibdev *dev,
 353                          struct ipath_ib_header *hdr, int has_grh,
 354                          void *data, u32 tlen, struct ipath_qp *qp)
 355 {
 356         /* Check for valid receive state. */
 357         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
 358                 dev->n_pkt_drops++;
 359                 return;
 360         }
 361
 362         switch (qp->ibqp.qp_type) {
 363         case IB_QPT_SMI:
 364         case IB_QPT_GSI:
 365                 if (ib_ipath_disable_sma)
 366                         break;
 367                 /* FALLTHROUGH */
 368         case IB_QPT_UD:
 369                 ipath_ud_rcv(dev, hdr, has_grh, data, tlen, qp);
 370                 break;
 371
 372         case IB_QPT_RC:
 373                 ipath_rc_rcv(dev, hdr, has_grh, data, tlen, qp);
 374                 break;
 375
 376         case IB_QPT_UC:
 377                 ipath_uc_rcv(dev, hdr, has_grh, data, tlen, qp);
 378                 break;
 379
 380         default:
 381                 break;
 382         }
 383 }
 384
 385 /**
 386  * ipath_ib_rcv - process an incoming packet
 387  * @arg: the device pointer
 388  * @rhdr: the header of the packet
 389  * @data: the packet data
 390  * @tlen: the packet length
 391  *
 392  * This is called from ipath_kreceive() to process an incoming packet at
 393  * interrupt level. Tlen is the length of the header + data + CRC in bytes.
 394  */
 395 void ipath_ib_rcv(struct ipath_ibdev *dev, void *rhdr, void *data,
 396                   u32 tlen)
 397 {
 398         struct ipath_ib_header *hdr = rhdr;
 399         struct ipath_other_headers *ohdr;
 400         struct ipath_qp *qp;
 401         u32 qp_num;
 402         int lnh;
 403         u8 opcode;
 404         u16 lid;
 405
 406         if (unlikely(dev == NULL))
 407                 goto bail;
 408
 409         if (unlikely(tlen < 24)) {      /* LRH+BTH+CRC */
 410                 dev->rcv_errors++;
 411                 goto bail;
 412         }
 413
 414         /* Check for a valid destination LID (see ch. 7.11.1). */
 415         lid = be16_to_cpu(hdr->lrh[1]);
 416         if (lid < IPATH_MULTICAST_LID_BASE) {
 417                 lid &= ~((1 << (dev->mkeyprot_resv_lmc & 7)) - 1);
 418                 if (unlikely(lid != dev->dd->ipath_lid)) {
 419                         dev->rcv_errors++;
 420                         goto bail;
 421                 }
 422         }
 423
 424         /* Check for GRH */
 425         lnh = be16_to_cpu(hdr->lrh[0]) & 3;
 426         if (lnh == IPATH_LRH_BTH)
 427                 ohdr = &hdr->u.oth;
 428         else if (lnh == IPATH_LRH_GRH)
 429                 ohdr = &hdr->u.l.oth;
 430         else {
 431                 dev->rcv_errors++;
 432                 goto bail;
 433         }
 434
 435         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 436         dev->opstats[opcode].n_bytes += tlen;
 437         dev->opstats[opcode].n_packets++;
 438
 439         /* Get the destination QP number. */
 440         qp_num = be32_to_cpu(ohdr->bth[1]) & IPATH_QPN_MASK;
 441         if (qp_num == IPATH_MULTICAST_QPN) {
 442                 struct ipath_mcast *mcast;
 443                 struct ipath_mcast_qp *p;
 444
 445                 if (lnh != IPATH_LRH_GRH) {
 446                         dev->n_pkt_drops++;
 447                         goto bail;
 448                 }
 449                 mcast = ipath_mcast_find(&hdr->u.l.grh.dgid);
 450                 if (mcast == NULL) {
 451                         dev->n_pkt_drops++;
 452                         goto bail;
 453                 }
 454                 dev->n_multicast_rcv++;
 455                 list_for_each_entry_rcu(p, &mcast->qp_list, list)
 456                         ipath_qp_rcv(dev, hdr, 1, data, tlen, p->qp);
 457                 /*
 458                  * Notify ipath_multicast_detach() if it is waiting for us
 459                  * to finish.
 460                  */
 461                 if (atomic_dec_return(&mcast->refcount) <= 1)
 462                         wake_up(&mcast->wait);
 463         } else {
 464                 qp = ipath_lookup_qpn(&dev->qp_table, qp_num);
 465                 if (qp) {
 466                         dev->n_unicast_rcv++;
 467                         ipath_qp_rcv(dev, hdr, lnh == IPATH_LRH_GRH, data,
 468                                      tlen, qp);
 469                         /*
 470                          * Notify ipath_destroy_qp() if it is waiting
 471                          * for us to finish.
 472                          */
 473                         if (atomic_dec_and_test(&qp->refcount))
 474                                 wake_up(&qp->wait);
 475                 } else
 476                         dev->n_pkt_drops++;
 477         }
 478
 479 bail:;
 480 }
 481
 482 /**
 483  * ipath_ib_timer - verbs timer
 484  * @arg: the device pointer
 485  *
 486  * This is called from ipath_do_rcv_timer() at interrupt level to check for
 487  * QPs which need retransmits and to collect performance numbers.
 488  */
 489 void ipath_ib_timer(struct ipath_ibdev *dev)
 490 {
 491         struct ipath_qp *resend = NULL;
 492         struct list_head *last;
 493         struct ipath_qp *qp;
 494         unsigned long flags;
 495
 496         if (dev == NULL)
 497                 return;
 498
 499         spin_lock_irqsave(&dev->pending_lock, flags);
 500         /* Start filling the next pending queue. */
 501         if (++dev->pending_index >= ARRAY_SIZE(dev->pending))
 502                 dev->pending_index = 0;
 503         /* Save any requests still in the new queue, they have timed out. */
 504         last = &dev->pending[dev->pending_index];
 505         while (!list_empty(last)) {
 506                 qp = list_entry(last->next, struct ipath_qp, timerwait);
 507                 list_del_init(&qp->timerwait);
 508                 qp->timer_next = resend;
 509                 resend = qp;
 510                 atomic_inc(&qp->refcount);
 511         }
 512         last = &dev->rnrwait;
 513         if (!list_empty(last)) {
 514                 qp = list_entry(last->next, struct ipath_qp, timerwait);
 515                 if (--qp->s_rnr_timeout == 0) {
 516                         do {
 517                                 list_del_init(&qp->timerwait);
 518                                 tasklet_hi_schedule(&qp->s_task);
 519                                 if (list_empty(last))
 520                                         break;
 521                                 qp = list_entry(last->next, struct ipath_qp,
 522                                                 timerwait);
 523                         } while (qp->s_rnr_timeout == 0);
 524                 }
 525         }
 526         /*
 527          * We should only be in the started state if pma_sample_start != 0
 528          */
 529         if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_STARTED &&
 530             --dev->pma_sample_start == 0) {
 531                 dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_RUNNING;
 532                 ipath_snapshot_counters(dev->dd, &dev->ipath_sword,
 533                                         &dev->ipath_rword,
 534                                         &dev->ipath_spkts,
 535                                         &dev->ipath_rpkts,
 536                                         &dev->ipath_xmit_wait);
 537         }
 538         if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_RUNNING) {
 539                 if (dev->pma_sample_interval == 0) {
 540                         u64 ta, tb, tc, td, te;
 541
 542                         dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_DONE;
 543                         ipath_snapshot_counters(dev->dd, &ta, &tb,
 544                                                 &tc, &td, &te);
 545
 546                         dev->ipath_sword = ta - dev->ipath_sword;
 547                         dev->ipath_rword = tb - dev->ipath_rword;
 548                         dev->ipath_spkts = tc - dev->ipath_spkts;
 549                         dev->ipath_rpkts = td - dev->ipath_rpkts;
 550                         dev->ipath_xmit_wait = te - dev->ipath_xmit_wait;
 551                 }
 552                 else
 553                         dev->pma_sample_interval--;
 554         }
 555         spin_unlock_irqrestore(&dev->pending_lock, flags);
 556
 557         /* XXX What if timer fires again while this is running? */
 558         for (qp = resend; qp != NULL; qp = qp->timer_next) {
 559                 struct ib_wc wc;
 560
 561                 spin_lock_irqsave(&qp->s_lock, flags);
 562                 if (qp->s_last != qp->s_tail && qp->state == IB_QPS_RTS) {
 563                         dev->n_timeouts++;
 564                         ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
 565                 }
 566                 spin_unlock_irqrestore(&qp->s_lock, flags);
 567
 568                 /* Notify ipath_destroy_qp() if it is waiting. */
 569                 if (atomic_dec_and_test(&qp->refcount))
 570                         wake_up(&qp->wait);
 571         }
 572 }
 573
 574 static void update_sge(struct ipath_sge_state *ss, u32 length)
 575 {
 576         struct ipath_sge *sge = &ss->sge;
 577
 578         sge->vaddr += length;
 579         sge->length -= length;
 580         sge->sge_length -= length;
 581         if (sge->sge_length == 0) {
 582                 if (--ss->num_sge)
 583                         *sge = *ss->sg_list++;
 584         } else if (sge->length == 0 && sge->mr != NULL) {
 585                 if (++sge->n >= IPATH_SEGSZ) {
 586                         if (++sge->m >= sge->mr->mapsz)
 587                                 return;
 588                         sge->n = 0;
 589                 }
 590                 sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
 591                 sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
 592         }
 593 }
 594
 595 #ifdef __LITTLE_ENDIAN
 596 static inline u32 get_upper_bits(u32 data, u32 shift)
 597 {
 598         return data >> shift;
 599 }
 600
 601 static inline u32 set_upper_bits(u32 data, u32 shift)
 602 {
 603         return data << shift;
 604 }
 605
 606 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
 607 {
 608         data <<= ((sizeof(u32) - n) * BITS_PER_BYTE);
 609         data >>= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
 610         return data;
 611 }
 612 #else
 613 static inline u32 get_upper_bits(u32 data, u32 shift)
 614 {
 615         return data << shift;
 616 }
 617
 618 static inline u32 set_upper_bits(u32 data, u32 shift)
 619 {
 620         return data >> shift;
 621 }
 622
 623 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
 624 {
 625         data >>= ((sizeof(u32) - n) * BITS_PER_BYTE);
 626         data <<= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
 627         return data;
 628 }
 629 #endif
 630
 631 static void copy_io(u32 __iomem *piobuf, struct ipath_sge_state *ss,
 632                     u32 length)
 633 {
 634         u32 extra = 0;
 635         u32 data = 0;
 636         u32 last;
 637
 638         while (1) {
 639                 u32 len = ss->sge.length;
 640                 u32 off;
 641
 642                 BUG_ON(len == 0);
 643                 if (len > length)
 644                         len = length;
 645                 if (len > ss->sge.sge_length)
 646                         len = ss->sge.sge_length;
 647                 /* If the source address is not aligned, try to align it. */
 648                 off = (unsigned long)ss->sge.vaddr & (sizeof(u32) - 1);
 649                 if (off) {
 650                         u32 *addr = (u32 *)((unsigned long)ss->sge.vaddr &
 651                                             ~(sizeof(u32) - 1));
 652                         u32 v = get_upper_bits(*addr, off * BITS_PER_BYTE);
 653                         u32 y;
 654
 655                         y = sizeof(u32) - off;
 656                         if (len > y)
 657                                 len = y;
 658                         if (len + extra >= sizeof(u32)) {
 659                                 data |= set_upper_bits(v, extra *
 660                                                        BITS_PER_BYTE);
 661                                 len = sizeof(u32) - extra;
 662                                 if (len == length) {
 663                                         last = data;
 664                                         break;
 665                                 }
 666                                 __raw_writel(data, piobuf);
 667                                 piobuf++;
 668                                 extra = 0;
 669                                 data = 0;
 670                         } else {
 671                                 /* Clear unused upper bytes */
 672                                 data |= clear_upper_bytes(v, len, extra);
 673                                 if (len == length) {
 674                                         last = data;
 675                                         break;
 676                                 }
 677                                 extra += len;
 678                         }
 679                 } else if (extra) {
 680                         /* Source address is aligned. */
 681                         u32 *addr = (u32 *) ss->sge.vaddr;
 682                         int shift = extra * BITS_PER_BYTE;
 683                         int ushift = 32 - shift;
 684                         u32 l = len;
 685
 686                         while (l >= sizeof(u32)) {
 687                                 u32 v = *addr;
 688
 689                                 data |= set_upper_bits(v, shift);
 690                                 __raw_writel(data, piobuf);
 691                                 data = get_upper_bits(v, ushift);
 692                                 piobuf++;
 693                                 addr++;
 694                                 l -= sizeof(u32);
 695                         }
 696                         /*
 697                          * We still have 'extra' number of bytes leftover.
 698                          */
 699                         if (l) {
 700                                 u32 v = *addr;
 701
 702                                 if (l + extra >= sizeof(u32)) {
 703                                         data |= set_upper_bits(v, shift);
 704                                         len -= l + extra - sizeof(u32);
 705                                         if (len == length) {
 706                                                 last = data;
 707                                                 break;
 708                                         }
 709                                         __raw_writel(data, piobuf);
 710                                         piobuf++;
 711                                         extra = 0;
 712                                         data = 0;
 713                                 } else {
 714                                         /* Clear unused upper bytes */
 715                                         data |= clear_upper_bytes(v, l,
 716                                                                   extra);
 717                                         if (len == length) {
 718                                                 last = data;
 719                                                 break;
 720                                         }
 721                                         extra += l;
 722                                 }
 723                         } else if (len == length) {
 724                                 last = data;
 725                                 break;
 726                         }
 727                 } else if (len == length) {
 728                         u32 w;
 729
 730                         /*
 731                          * Need to round up for the last dword in the
 732                          * packet.
 733                          */
 734                         w = (len + 3) >> 2;
 735                         __iowrite32_copy(piobuf, ss->sge.vaddr, w - 1);
 736                         piobuf += w - 1;
 737                         last = ((u32 *) ss->sge.vaddr)[w - 1];
 738                         break;
 739                 } else {
 740                         u32 w = len >> 2;
 741
 742                         __iowrite32_copy(piobuf, ss->sge.vaddr, w);
 743                         piobuf += w;
 744
 745                         extra = len & (sizeof(u32) - 1);
 746                         if (extra) {
 747                                 u32 v = ((u32 *) ss->sge.vaddr)[w];
 748
 749                                 /* Clear unused upper bytes */
 750                                 data = clear_upper_bytes(v, extra, 0);
 751                         }
 752                 }
 753                 update_sge(ss, len);
 754                 length -= len;
 755         }
 756         /* Update address before sending packet. */
 757         update_sge(ss, length);
 758         /* must flush early everything before trigger word */
 759         ipath_flush_wc();
 760         __raw_writel(last, piobuf);
 761         /* be sure trigger word is written */
 762         ipath_flush_wc();
 763 }
 764
 765 /**
 766  * ipath_verbs_send - send a packet
 767  * @dd: the infinipath device
 768  * @hdrwords: the number of words in the header
 769  * @hdr: the packet header
 770  * @len: the length of the packet in bytes
 771  * @ss: the SGE to send
 772  */
 773 int ipath_verbs_send(struct ipath_devdata *dd, u32 hdrwords,
 774                      u32 *hdr, u32 len, struct ipath_sge_state *ss)
 775 {
 776         u32 __iomem *piobuf;
 777         u32 plen;
 778         int ret;
 779
 780         /* +1 is for the qword padding of pbc */
 781         plen = hdrwords + ((len + 3) >> 2) + 1;
 782         if (unlikely((plen << 2) > dd->ipath_ibmaxlen)) {
 783                 ret = -EINVAL;
 784                 goto bail;
 785         }
 786
 787         /* Get a PIO buffer to use. */
 788         piobuf = ipath_getpiobuf(dd, NULL);
 789         if (unlikely(piobuf == NULL)) {
 790                 ret = -EBUSY;
 791                 goto bail;
 792         }
 793
 794         /*
 795          * Write len to control qword, no flags.
 796          * We have to flush after the PBC for correctness on some cpus
 797          * or WC buffer can be written out of order.
 798          */
 799         writeq(plen, piobuf);
 800         ipath_flush_wc();
 801         piobuf += 2;
 802         if (len == 0) {
 803                 /*
 804                  * If there is just the header portion, must flush before
 805                  * writing last word of header for correctness, and after
 806                  * the last header word (trigger word).
 807                  */
 808                 __iowrite32_copy(piobuf, hdr, hdrwords - 1);
 809                 ipath_flush_wc();
 810                 __raw_writel(hdr[hdrwords - 1], piobuf + hdrwords - 1);
 811                 ipath_flush_wc();
 812                 ret = 0;
 813                 goto bail;
 814         }
 815
 816         __iowrite32_copy(piobuf, hdr, hdrwords);
 817         piobuf += hdrwords;
 818
 819         /* The common case is aligned and contained in one segment. */
 820         if (likely(ss->num_sge == 1 && len <= ss->sge.length &&
 821                    !((unsigned long)ss->sge.vaddr & (sizeof(u32) - 1)))) {
 822                 u32 w;
 823                 u32 *addr = (u32 *) ss->sge.vaddr;
 824
 825                 /* Update address before sending packet. */
 826                 update_sge(ss, len);
 827                 /* Need to round up for the last dword in the packet. */
 828                 w = (len + 3) >> 2;
 829                 __iowrite32_copy(piobuf, addr, w - 1);
 830                 /* must flush early everything before trigger word */
 831                 ipath_flush_wc();
 832                 __raw_writel(addr[w - 1], piobuf + w - 1);
 833                 /* be sure trigger word is written */
 834                 ipath_flush_wc();
 835                 ret = 0;
 836                 goto bail;
 837         }
 838         copy_io(piobuf, ss, len);
 839         ret = 0;
 840
 841 bail:
 842         return ret;
 843 }
 844
 845 int ipath_snapshot_counters(struct ipath_devdata *dd, u64 *swords,
 846                             u64 *rwords, u64 *spkts, u64 *rpkts,
 847                             u64 *xmit_wait)
 848 {
 849         int ret;
 850
 851         if (!(dd->ipath_flags & IPATH_INITTED)) {
 852                 /* no hardware, freeze, etc. */
 853                 ipath_dbg("unit %u not usable\n", dd->ipath_unit);
 854                 ret = -EINVAL;
 855                 goto bail;
 856         }
 857         *swords = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
 858         *rwords = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
 859         *spkts = ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
 860         *rpkts = ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
 861         *xmit_wait = ipath_snap_cntr(dd, dd->ipath_cregs->cr_sendstallcnt);
 862
 863         ret = 0;
 864
 865 bail:
 866         return ret;
 867 }
 868
 869 /**
 870  * ipath_get_counters - get various chip counters
 871  * @dd: the infinipath device
 872  * @cntrs: counters are placed here
 873  *
 874  * Return the counters needed by recv_pma_get_portcounters().
 875  */
 876 int ipath_get_counters(struct ipath_devdata *dd,
 877                        struct ipath_verbs_counters *cntrs)
 878 {
 879         int ret;
 880
 881         if (!(dd->ipath_flags & IPATH_INITTED)) {
 882                 /* no hardware, freeze, etc. */
 883                 ipath_dbg("unit %u not usable\n", dd->ipath_unit);
 884                 ret = -EINVAL;
 885                 goto bail;
 886         }
 887         cntrs->symbol_error_counter =
 888                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_ibsymbolerrcnt);
 889         cntrs->link_error_recovery_counter =
 890                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_iblinkerrrecovcnt);
 891         /*
 892          * The link downed counter counts when the other side downs the
 893          * connection.  We add in the number of times we downed the link
 894          * due to local link integrity errors to compensate.
 895          */
 896         cntrs->link_downed_counter =
 897                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_iblinkdowncnt);
 898         cntrs->port_rcv_errors =
 899                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_rxdroppktcnt) +
 900                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_rcvovflcnt) +
 901                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_portovflcnt) +
 902                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_err_rlencnt) +
 903                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_invalidrlencnt) +
 904                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_erricrccnt) +
 905                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_errvcrccnt) +
 906                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_errlpcrccnt) +
 907                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_badformatcnt) +
 908                 dd->ipath_rxfc_unsupvl_errs;
 909         cntrs->port_rcv_remphys_errors =
 910                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_rcvebpcnt);
 911         cntrs->port_xmit_discards =
 912                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_unsupvlcnt);
 913         cntrs->port_xmit_data =
 914                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
 915         cntrs->port_rcv_data =
 916                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
 917         cntrs->port_xmit_packets =
 918                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
 919         cntrs->port_rcv_packets =
 920                 ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
 921         cntrs->local_link_integrity_errors =
 922                 (dd->ipath_flags & IPATH_GPIO_ERRINTRS) ?
 923                 dd->ipath_lli_errs : dd->ipath_lli_errors;
 924         cntrs->excessive_buffer_overrun_errors = dd->ipath_overrun_thresh_errs;
 925
 926         ret = 0;
 927
 928 bail:
 929         return ret;
 930 }
 931
 932 /**
 933  * ipath_ib_piobufavail - callback when a PIO buffer is available
 934  * @arg: the device pointer
 935  *
 936  * This is called from ipath_intr() at interrupt level when a PIO buffer is
 937  * available after ipath_verbs_send() returned an error that no buffers were
 938  * available.  Return 1 if we consumed all the PIO buffers and we still have
 939  * QPs waiting for buffers (for now, just do a tasklet_hi_schedule and
 940  * return zero).
 941  */
 942 int ipath_ib_piobufavail(struct ipath_ibdev *dev)
 943 {
 944         struct ipath_qp *qp;
 945         unsigned long flags;
 946
 947         if (dev == NULL)
 948                 goto bail;
 949
 950         spin_lock_irqsave(&dev->pending_lock, flags);
 951         while (!list_empty(&dev->piowait)) {
 952                 qp = list_entry(dev->piowait.next, struct ipath_qp,
 953                                 piowait);
 954                 list_del_init(&qp->piowait);
 955                 clear_bit(IPATH_S_BUSY, &qp->s_busy);
 956                 tasklet_hi_schedule(&qp->s_task);
 957         }
 958         spin_unlock_irqrestore(&dev->pending_lock, flags);
 959
 960 bail:
 961         return 0;
 962 }
 963
 964 static int ipath_query_device(struct ib_device *ibdev,
 965                               struct ib_device_attr *props)
 966 {
 967         struct ipath_ibdev *dev = to_idev(ibdev);
 968
 969         memset(props, 0, sizeof(*props));
 970
 971         props->device_cap_flags = IB_DEVICE_BAD_PKEY_CNTR |
 972                 IB_DEVICE_BAD_QKEY_CNTR | IB_DEVICE_SHUTDOWN_PORT |
 973                 IB_DEVICE_SYS_IMAGE_GUID;
 974         props->page_size_cap = PAGE_SIZE;
 975         props->vendor_id = dev->dd->ipath_vendorid;
 976         props->vendor_part_id = dev->dd->ipath_deviceid;
 977         props->hw_ver = dev->dd->ipath_pcirev;
 978
 979         props->sys_image_guid = dev->sys_image_guid;
 980
 981         props->max_mr_size = ~0ull;
 982         props->max_qp = ib_ipath_max_qps;
 983         props->max_qp_wr = ib_ipath_max_qp_wrs;
 984         props->max_sge = ib_ipath_max_sges;
 985         props->max_cq = ib_ipath_max_cqs;
 986         props->max_ah = ib_ipath_max_ahs;
 987         props->max_cqe = ib_ipath_max_cqes;
 988         props->max_mr = dev->lk_table.max;
 989         props->max_fmr = dev->lk_table.max;
 990         props->max_map_per_fmr = 32767;
 991         props->max_pd = ib_ipath_max_pds;
 992         props->max_qp_rd_atom = IPATH_MAX_RDMA_ATOMIC;
 993         props->max_qp_init_rd_atom = 255;
 994         /* props->max_res_rd_atom */
 995         props->max_srq = ib_ipath_max_srqs;
 996         props->max_srq_wr = ib_ipath_max_srq_wrs;
 997         props->max_srq_sge = ib_ipath_max_srq_sges;
 998         /* props->local_ca_ack_delay */
 999         props->atomic_cap = IB_ATOMIC_GLOB;
1000         props->max_pkeys = ipath_get_npkeys(dev->dd);
1001         props->max_mcast_grp = ib_ipath_max_mcast_grps;
1002         props->max_mcast_qp_attach = ib_ipath_max_mcast_qp_attached;
1003         props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
1004                 props->max_mcast_grp;
1005
1006         return 0;
1007 }
1008
1009 const u8 ipath_cvt_physportstate[16] = {
1010         [INFINIPATH_IBCS_LT_STATE_DISABLED] = 3,
1011         [INFINIPATH_IBCS_LT_STATE_LINKUP] = 5,
1012         [INFINIPATH_IBCS_LT_STATE_POLLACTIVE] = 2,
1013         [INFINIPATH_IBCS_LT_STATE_POLLQUIET] = 2,
1014         [INFINIPATH_IBCS_LT_STATE_SLEEPDELAY] = 1,
1015         [INFINIPATH_IBCS_LT_STATE_SLEEPQUIET] = 1,
1016         [INFINIPATH_IBCS_LT_STATE_CFGDEBOUNCE] = 4,
1017         [INFINIPATH_IBCS_LT_STATE_CFGRCVFCFG] = 4,
1018         [INFINIPATH_IBCS_LT_STATE_CFGWAITRMT] = 4,
1019         [INFINIPATH_IBCS_LT_STATE_CFGIDLE] = 4,
1020         [INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN] = 6,
1021         [INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT] = 6,
1022         [INFINIPATH_IBCS_LT_STATE_RECOVERIDLE] = 6,
1023 };
1024
1025 u32 ipath_get_cr_errpkey(struct ipath_devdata *dd)
1026 {
1027         return ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
1028 }
1029
1030 static int ipath_query_port(struct ib_device *ibdev,
1031                             u8 port, struct ib_port_attr *props)
1032 {
1033         struct ipath_ibdev *dev = to_idev(ibdev);
1034         enum ib_mtu mtu;
1035         u16 lid = dev->dd->ipath_lid;
1036         u64 ibcstat;
1037
1038         memset(props, 0, sizeof(*props));
1039         props->lid = lid ? lid : __constant_be16_to_cpu(IB_LID_PERMISSIVE);
1040         props->lmc = dev->mkeyprot_resv_lmc & 7;
1041         props->sm_lid = dev->sm_lid;
1042         props->sm_sl = dev->sm_sl;
1043         ibcstat = dev->dd->ipath_lastibcstat;
1044         props->state = ((ibcstat >> 4) & 0x3) + 1;
1045         /* See phys_state_show() */
1046         props->phys_state = ipath_cvt_physportstate[
1047                 dev->dd->ipath_lastibcstat & 0xf];
1048         props->port_cap_flags = dev->port_cap_flags;
1049         props->gid_tbl_len = 1;
1050         props->max_msg_sz = 0x80000000;
1051         props->pkey_tbl_len = ipath_get_npkeys(dev->dd);
1052         props->bad_pkey_cntr = ipath_get_cr_errpkey(dev->dd) -
1053                 dev->z_pkey_violations;
1054         props->qkey_viol_cntr = dev->qkey_violations;
1055         props->active_width = IB_WIDTH_4X;
1056         /* See rate_show() */
1057         props->active_speed = 1;        /* Regular 10Mbs speed. */
1058         props->max_vl_num = 1;          /* VLCap = VL0 */
1059         props->init_type_reply = 0;
1060
1061         /*
1062          * Note: the chips support a maximum MTU of 4096, but the driver
1063          * hasn't implemented this feature yet, so set the maximum value
1064          * to 2048.
1065          */
1066         props->max_mtu = IB_MTU_2048;
1067         switch (dev->dd->ipath_ibmtu) {
1068         case 4096:
1069                 mtu = IB_MTU_4096;
1070                 break;
1071         case 2048:
1072                 mtu = IB_MTU_2048;
1073                 break;
1074         case 1024:
1075                 mtu = IB_MTU_1024;
1076                 break;
1077         case 512:
1078                 mtu = IB_MTU_512;
1079                 break;
1080         case 256:
1081                 mtu = IB_MTU_256;
1082                 break;
1083         default:
1084                 mtu = IB_MTU_2048;
1085         }
1086         props->active_mtu = mtu;
1087         props->subnet_timeout = dev->subnet_timeout;
1088
1089         return 0;
1090 }
1091
1092 static int ipath_modify_device(struct ib_device *device,
1093                                int device_modify_mask,
1094                                struct ib_device_modify *device_modify)
1095 {
1096         int ret;
1097
1098         if (device_modify_mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
1099                                    IB_DEVICE_MODIFY_NODE_DESC)) {
1100                 ret = -EOPNOTSUPP;
1101                 goto bail;
1102         }
1103
1104         if (device_modify_mask & IB_DEVICE_MODIFY_NODE_DESC)
1105                 memcpy(device->node_desc, device_modify->node_desc, 64);
1106
1107         if (device_modify_mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID)
1108                 to_idev(device)->sys_image_guid =
1109                         cpu_to_be64(device_modify->sys_image_guid);
1110
1111         ret = 0;
1112
1113 bail:
1114         return ret;
1115 }
1116
1117 static int ipath_modify_port(struct ib_device *ibdev,
1118                              u8 port, int port_modify_mask,
1119                              struct ib_port_modify *props)
1120 {
1121         struct ipath_ibdev *dev = to_idev(ibdev);
1122
1123         dev->port_cap_flags |= props->set_port_cap_mask;
1124         dev->port_cap_flags &= ~props->clr_port_cap_mask;
1125         if (port_modify_mask & IB_PORT_SHUTDOWN)
1126                 ipath_set_linkstate(dev->dd, IPATH_IB_LINKDOWN);
1127         if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR)
1128                 dev->qkey_violations = 0;
1129         return 0;
1130 }
1131
1132 static int ipath_query_gid(struct ib_device *ibdev, u8 port,
1133                            int index, union ib_gid *gid)
1134 {
1135         struct ipath_ibdev *dev = to_idev(ibdev);
1136         int ret;
1137
1138         if (index >= 1) {
1139                 ret = -EINVAL;
1140                 goto bail;
1141         }
1142         gid->global.subnet_prefix = dev->gid_prefix;
1143         gid->global.interface_id = dev->dd->ipath_guid;
1144
1145         ret = 0;
1146
1147 bail:
1148         return ret;
1149 }
1150
1151 static struct ib_pd *ipath_alloc_pd(struct ib_device *ibdev,
1152                                     struct ib_ucontext *context,
1153                                     struct ib_udata *udata)
1154 {
1155         struct ipath_ibdev *dev = to_idev(ibdev);
1156         struct ipath_pd *pd;
1157         struct ib_pd *ret;
1158
1159         /*
1160          * This is actually totally arbitrary.  Some correctness tests
1161          * assume there's a maximum number of PDs that can be allocated.
1162          * We don't actually have this limit, but we fail the test if
1163          * we allow allocations of more than we report for this value.
1164          */
1165
1166         pd = kmalloc(sizeof *pd, GFP_KERNEL);
1167         if (!pd) {
1168                 ret = ERR_PTR(-ENOMEM);
1169                 goto bail;
1170         }
1171
1172         spin_lock(&dev->n_pds_lock);
1173         if (dev->n_pds_allocated == ib_ipath_max_pds) {
1174                 spin_unlock(&dev->n_pds_lock);
1175                 kfree(pd);
1176                 ret = ERR_PTR(-ENOMEM);
1177                 goto bail;
1178         }
1179
1180         dev->n_pds_allocated++;
1181         spin_unlock(&dev->n_pds_lock);
1182
1183         /* ib_alloc_pd() will initialize pd->ibpd. */
1184         pd->user = udata != NULL;
1185
1186         ret = &pd->ibpd;
1187
1188 bail:
1189         return ret;
1190 }
1191
1192 static int ipath_dealloc_pd(struct ib_pd *ibpd)
1193 {
1194         struct ipath_pd *pd = to_ipd(ibpd);
1195         struct ipath_ibdev *dev = to_idev(ibpd->device);
1196
1197         spin_lock(&dev->n_pds_lock);
1198         dev->n_pds_allocated--;
1199         spin_unlock(&dev->n_pds_lock);
1200
1201         kfree(pd);
1202
1203         return 0;
1204 }
1205
1206 /**
1207  * ipath_create_ah - create an address handle
1208  * @pd: the protection domain
1209  * @ah_attr: the attributes of the AH
1210  *
1211  * This may be called from interrupt context.
1212  */
1213 static struct ib_ah *ipath_create_ah(struct ib_pd *pd,
1214                                      struct ib_ah_attr *ah_attr)
1215 {
1216         struct ipath_ah *ah;
1217         struct ib_ah *ret;
1218         struct ipath_ibdev *dev = to_idev(pd->device);
1219         unsigned long flags;
1220
1221         /* A multicast address requires a GRH (see ch. 8.4.1). */
1222         if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
1223             ah_attr->dlid != IPATH_PERMISSIVE_LID &&
1224             !(ah_attr->ah_flags & IB_AH_GRH)) {
1225                 ret = ERR_PTR(-EINVAL);
1226                 goto bail;
1227         }
1228
1229         if (ah_attr->dlid == 0) {
1230                 ret = ERR_PTR(-EINVAL);
1231                 goto bail;
1232         }
1233
1234         if (ah_attr->port_num < 1 ||
1235             ah_attr->port_num > pd->device->phys_port_cnt) {
1236                 ret = ERR_PTR(-EINVAL);
1237                 goto bail;
1238         }
1239
1240         ah = kmalloc(sizeof *ah, GFP_ATOMIC);
1241         if (!ah) {
1242                 ret = ERR_PTR(-ENOMEM);
1243                 goto bail;
1244         }
1245
1246         spin_lock_irqsave(&dev->n_ahs_lock, flags);
1247         if (dev->n_ahs_allocated == ib_ipath_max_ahs) {
1248                 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1249                 kfree(ah);
1250                 ret = ERR_PTR(-ENOMEM);
1251                 goto bail;
1252         }
1253
1254         dev->n_ahs_allocated++;
1255         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1256
1257         /* ib_create_ah() will initialize ah->ibah. */
1258         ah->attr = *ah_attr;
1259
1260         ret = &ah->ibah;
1261
1262 bail:
1263         return ret;
1264 }
1265
1266 /**
1267  * ipath_destroy_ah - destroy an address handle
1268  * @ibah: the AH to destroy
1269  *
1270  * This may be called from interrupt context.
1271  */
1272 static int ipath_destroy_ah(struct ib_ah *ibah)
1273 {
1274         struct ipath_ibdev *dev = to_idev(ibah->device);
1275         struct ipath_ah *ah = to_iah(ibah);
1276         unsigned long flags;
1277
1278         spin_lock_irqsave(&dev->n_ahs_lock, flags);
1279         dev->n_ahs_allocated--;
1280         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1281
1282         kfree(ah);
1283
1284         return 0;
1285 }
1286
1287 static int ipath_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1288 {
1289         struct ipath_ah *ah = to_iah(ibah);
1290
1291         *ah_attr = ah->attr;
1292
1293         return 0;
1294 }
1295
1296 /**
1297  * ipath_get_npkeys - return the size of the PKEY table for port 0
1298  * @dd: the infinipath device
1299  */
1300 unsigned ipath_get_npkeys(struct ipath_devdata *dd)
1301 {
1302         return ARRAY_SIZE(dd->ipath_pd[0]->port_pkeys);
1303 }
1304
1305 /**
1306  * ipath_get_pkey - return the indexed PKEY from the port 0 PKEY table
1307  * @dd: the infinipath device
1308  * @index: the PKEY index
1309  */
1310 unsigned ipath_get_pkey(struct ipath_devdata *dd, unsigned index)
1311 {
1312         unsigned ret;
1313
1314         if (index >= ARRAY_SIZE(dd->ipath_pd[0]->port_pkeys))
1315                 ret = 0;
1316         else
1317                 ret = dd->ipath_pd[0]->port_pkeys[index];
1318
1319         return ret;
1320 }
1321
1322 static int ipath_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
1323                             u16 *pkey)
1324 {
1325         struct ipath_ibdev *dev = to_idev(ibdev);
1326         int ret;
1327
1328         if (index >= ipath_get_npkeys(dev->dd)) {
1329                 ret = -EINVAL;
1330                 goto bail;
1331         }
1332
1333         *pkey = ipath_get_pkey(dev->dd, index);
1334         ret = 0;
1335
1336 bail:
1337         return ret;
1338 }
1339
1340 /**
1341  * ipath_alloc_ucontext - allocate a ucontest
1342  * @ibdev: the infiniband device
1343  * @udata: not used by the InfiniPath driver
1344  */
1345
1346 static struct ib_ucontext *ipath_alloc_ucontext(struct ib_device *ibdev,
1347                                                 struct ib_udata *udata)
1348 {
1349         struct ipath_ucontext *context;
1350         struct ib_ucontext *ret;
1351
1352         context = kmalloc(sizeof *context, GFP_KERNEL);
1353         if (!context) {
1354                 ret = ERR_PTR(-ENOMEM);
1355                 goto bail;
1356         }
1357
1358         ret = &context->ibucontext;
1359
1360 bail:
1361         return ret;
1362 }
1363
1364 static int ipath_dealloc_ucontext(struct ib_ucontext *context)
1365 {
1366         kfree(to_iucontext(context));
1367         return 0;
1368 }
1369
1370 static int ipath_verbs_register_sysfs(struct ib_device *dev);
1371
1372 static void __verbs_timer(unsigned long arg)
1373 {
1374         struct ipath_devdata *dd = (struct ipath_devdata *) arg;
1375
1376         /*
1377          * If port 0 receive packet interrupts are not available, or
1378          * can be missed, poll the receive queue
1379          */
1380         if (dd->ipath_flags & IPATH_POLL_RX_INTR)
1381                 ipath_kreceive(dd);
1382
1383         /* Handle verbs layer timeouts. */
1384         ipath_ib_timer(dd->verbs_dev);
1385
1386         mod_timer(&dd->verbs_timer, jiffies + 1);
1387 }
1388
1389 static int enable_timer(struct ipath_devdata *dd)
1390 {
1391         /*
1392          * Early chips had a design flaw where the chip and kernel idea
1393          * of the tail register don't always agree, and therefore we won't
1394          * get an interrupt on the next packet received.
1395          * If the board supports per packet receive interrupts, use it.
1396          * Otherwise, the timer function periodically checks for packets
1397          * to cover this case.
1398          * Either way, the timer is needed for verbs layer related
1399          * processing.
1400          */
1401         if (dd->ipath_flags & IPATH_GPIO_INTR) {
1402                 ipath_write_kreg(dd, dd->ipath_kregs->kr_debugportselect,
1403                                  0x2074076542310ULL);
1404                 /* Enable GPIO bit 2 interrupt */
1405                 dd->ipath_gpio_mask |= (u64) (1 << IPATH_GPIO_PORT0_BIT);
1406                 ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_mask,
1407                                  dd->ipath_gpio_mask);
1408         }
1409
1410         init_timer(&dd->verbs_timer);
1411         dd->verbs_timer.function = __verbs_timer;
1412         dd->verbs_timer.data = (unsigned long)dd;
1413         dd->verbs_timer.expires = jiffies + 1;
1414         add_timer(&dd->verbs_timer);
1415
1416         return 0;
1417 }
1418
1419 static int disable_timer(struct ipath_devdata *dd)
1420 {
1421         /* Disable GPIO bit 2 interrupt */
1422         if (dd->ipath_flags & IPATH_GPIO_INTR) {
1423                 u64 val;
1424                 /* Disable GPIO bit 2 interrupt */
1425                 val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_gpio_mask);
1426                 dd->ipath_gpio_mask &= ~((u64) (1 << IPATH_GPIO_PORT0_BIT));
1427                 ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_mask,
1428                                  dd->ipath_gpio_mask);
1429                 /*
1430                  * We might want to undo changes to debugportselect,
1431                  * but how?
1432                  */
1433         }
1434
1435         del_timer_sync(&dd->verbs_timer);
1436
1437         return 0;
1438 }
1439
1440 /**
1441  * ipath_register_ib_device - register our device with the infiniband core
1442  * @dd: the device data structure
1443  * Return the allocated ipath_ibdev pointer or NULL on error.
1444  */
1445 int ipath_register_ib_device(struct ipath_devdata *dd)
1446 {
1447         struct ipath_verbs_counters cntrs;
1448         struct ipath_ibdev *idev;
1449         struct ib_device *dev;
1450         int ret;
1451
1452         idev = (struct ipath_ibdev *)ib_alloc_device(sizeof *idev);
1453         if (idev == NULL) {
1454                 ret = -ENOMEM;
1455                 goto bail;
1456         }
1457
1458         dev = &idev->ibdev;
1459
1460         /* Only need to initialize non-zero fields. */
1461         spin_lock_init(&idev->n_pds_lock);
1462         spin_lock_init(&idev->n_ahs_lock);
1463         spin_lock_init(&idev->n_cqs_lock);
1464         spin_lock_init(&idev->n_qps_lock);
1465         spin_lock_init(&idev->n_srqs_lock);
1466         spin_lock_init(&idev->n_mcast_grps_lock);
1467
1468         spin_lock_init(&idev->qp_table.lock);
1469         spin_lock_init(&idev->lk_table.lock);
1470         idev->sm_lid = __constant_be16_to_cpu(IB_LID_PERMISSIVE);
1471         /* Set the prefix to the default value (see ch. 4.1.1) */
1472         idev->gid_prefix = __constant_cpu_to_be64(0xfe80000000000000ULL);
1473
1474         ret = ipath_init_qp_table(idev, ib_ipath_qp_table_size);
1475         if (ret)
1476                 goto err_qp;
1477
1478         /*
1479          * The top ib_ipath_lkey_table_size bits are used to index the
1480          * table.  The lower 8 bits can be owned by the user (copied from
1481          * the LKEY).  The remaining bits act as a generation number or tag.
1482          */
1483         idev->lk_table.max = 1 << ib_ipath_lkey_table_size;
1484         idev->lk_table.table = kzalloc(idev->lk_table.max *
1485                                        sizeof(*idev->lk_table.table),
1486                                        GFP_KERNEL);
1487         if (idev->lk_table.table == NULL) {
1488                 ret = -ENOMEM;
1489                 goto err_lk;
1490         }
1491         INIT_LIST_HEAD(&idev->pending_mmaps);
1492         spin_lock_init(&idev->pending_lock);
1493         idev->mmap_offset = PAGE_SIZE;
1494         spin_lock_init(&idev->mmap_offset_lock);
1495         INIT_LIST_HEAD(&idev->pending[0]);
1496         INIT_LIST_HEAD(&idev->pending[1]);
1497         INIT_LIST_HEAD(&idev->pending[2]);
1498         INIT_LIST_HEAD(&idev->piowait);
1499         INIT_LIST_HEAD(&idev->rnrwait);
1500         idev->pending_index = 0;
1501         idev->port_cap_flags =
1502                 IB_PORT_SYS_IMAGE_GUID_SUP | IB_PORT_CLIENT_REG_SUP;
1503         idev->pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
1504         idev->pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
1505         idev->pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
1506         idev->pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
1507         idev->pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;
1508         idev->link_width_enabled = 3;   /* 1x or 4x */
1509
1510         /* Snapshot current HW counters to "clear" them. */
1511         ipath_get_counters(dd, &cntrs);
1512         idev->z_symbol_error_counter = cntrs.symbol_error_counter;
1513         idev->z_link_error_recovery_counter =
1514                 cntrs.link_error_recovery_counter;
1515         idev->z_link_downed_counter = cntrs.link_downed_counter;
1516         idev->z_port_rcv_errors = cntrs.port_rcv_errors;
1517         idev->z_port_rcv_remphys_errors =
1518                 cntrs.port_rcv_remphys_errors;
1519         idev->z_port_xmit_discards = cntrs.port_xmit_discards;
1520         idev->z_port_xmit_data = cntrs.port_xmit_data;
1521         idev->z_port_rcv_data = cntrs.port_rcv_data;
1522         idev->z_port_xmit_packets = cntrs.port_xmit_packets;
1523         idev->z_port_rcv_packets = cntrs.port_rcv_packets;
1524         idev->z_local_link_integrity_errors =
1525                 cntrs.local_link_integrity_errors;
1526         idev->z_excessive_buffer_overrun_errors =
1527                 cntrs.excessive_buffer_overrun_errors;
1528
1529         /*
1530          * The system image GUID is supposed to be the same for all
1531          * IB HCAs in a single system but since there can be other
1532          * device types in the system, we can't be sure this is unique.
1533          */
1534         if (!sys_image_guid)
1535                 sys_image_guid = dd->ipath_guid;
1536         idev->sys_image_guid = sys_image_guid;
1537         idev->ib_unit = dd->ipath_unit;
1538         idev->dd = dd;
1539
1540         strlcpy(dev->name, "ipath%d", IB_DEVICE_NAME_MAX);
1541         dev->owner = THIS_MODULE;
1542         dev->node_guid = dd->ipath_guid;
1543         dev->uverbs_abi_ver = IPATH_UVERBS_ABI_VERSION;
1544         dev->uverbs_cmd_mask =
1545                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT)         |
1546                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE)        |
1547                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT)          |
1548                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD)            |
1549                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD)          |
1550                 (1ull << IB_USER_VERBS_CMD_CREATE_AH)           |
1551                 (1ull << IB_USER_VERBS_CMD_DESTROY_AH)          |
1552                 (1ull << IB_USER_VERBS_CMD_QUERY_AH)            |
1553                 (1ull << IB_USER_VERBS_CMD_REG_MR)              |
1554                 (1ull << IB_USER_VERBS_CMD_DEREG_MR)            |
1555                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
1556                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ)           |
1557                 (1ull << IB_USER_VERBS_CMD_RESIZE_CQ)           |
1558                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ)          |
1559                 (1ull << IB_USER_VERBS_CMD_POLL_CQ)             |
1560                 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ)       |
1561                 (1ull << IB_USER_VERBS_CMD_CREATE_QP)           |
1562                 (1ull << IB_USER_VERBS_CMD_QUERY_QP)            |
1563                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP)           |
1564                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP)          |
1565                 (1ull << IB_USER_VERBS_CMD_POST_SEND)           |
1566                 (1ull << IB_USER_VERBS_CMD_POST_RECV)           |
1567                 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST)        |
1568                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST)        |
1569                 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ)          |
1570                 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ)          |
1571                 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ)           |
1572                 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ)         |
1573                 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
1574         dev->node_type = RDMA_NODE_IB_CA;
1575         dev->phys_port_cnt = 1;
1576         dev->num_comp_vectors = 1;
1577         dev->dma_device = &dd->pcidev->dev;
1578         dev->query_device = ipath_query_device;
1579         dev->modify_device = ipath_modify_device;
1580         dev->query_port = ipath_query_port;
1581         dev->modify_port = ipath_modify_port;
1582         dev->query_pkey = ipath_query_pkey;
1583         dev->query_gid = ipath_query_gid;
1584         dev->alloc_ucontext = ipath_alloc_ucontext;
1585         dev->dealloc_ucontext = ipath_dealloc_ucontext;
1586         dev->alloc_pd = ipath_alloc_pd;
1587         dev->dealloc_pd = ipath_dealloc_pd;
1588         dev->create_ah = ipath_create_ah;
1589         dev->destroy_ah = ipath_destroy_ah;
1590         dev->query_ah = ipath_query_ah;
1591         dev->create_srq = ipath_create_srq;
1592         dev->modify_srq = ipath_modify_srq;
1593         dev->query_srq = ipath_query_srq;
1594         dev->destroy_srq = ipath_destroy_srq;
1595         dev->create_qp = ipath_create_qp;
1596         dev->modify_qp = ipath_modify_qp;
1597         dev->query_qp = ipath_query_qp;
1598         dev->destroy_qp = ipath_destroy_qp;
1599         dev->post_send = ipath_post_send;
1600         dev->post_recv = ipath_post_receive;
1601         dev->post_srq_recv = ipath_post_srq_receive;
1602         dev->create_cq = ipath_create_cq;
1603         dev->destroy_cq = ipath_destroy_cq;
1604         dev->resize_cq = ipath_resize_cq;
1605         dev->poll_cq = ipath_poll_cq;
1606         dev->req_notify_cq = ipath_req_notify_cq;
1607         dev->get_dma_mr = ipath_get_dma_mr;
1608         dev->reg_phys_mr = ipath_reg_phys_mr;
1609         dev->reg_user_mr = ipath_reg_user_mr;
1610         dev->dereg_mr = ipath_dereg_mr;
1611         dev->alloc_fmr = ipath_alloc_fmr;
1612         dev->map_phys_fmr = ipath_map_phys_fmr;
1613         dev->unmap_fmr = ipath_unmap_fmr;
1614         dev->dealloc_fmr = ipath_dealloc_fmr;
1615         dev->attach_mcast = ipath_multicast_attach;
1616         dev->detach_mcast = ipath_multicast_detach;
1617         dev->process_mad = ipath_process_mad;
1618         dev->mmap = ipath_mmap;
1619         dev->dma_ops = &ipath_dma_mapping_ops;
1620
1621         snprintf(dev->node_desc, sizeof(dev->node_desc),
1622                  IPATH_IDSTR " %s", init_utsname()->nodename);
1623
1624         ret = ib_register_device(dev);
1625         if (ret)
1626                 goto err_reg;
1627
1628         if (ipath_verbs_register_sysfs(dev))
1629                 goto err_class;
1630
1631         enable_timer(dd);
1632
1633         goto bail;
1634
1635 err_class:
1636         ib_unregister_device(dev);
1637 err_reg:
1638         kfree(idev->lk_table.table);
1639 err_lk:
1640         kfree(idev->qp_table.table);
1641 err_qp:
1642         ib_dealloc_device(dev);
1643         ipath_dev_err(dd, "cannot register verbs: %d!\n", -ret);
1644         idev = NULL;
1645
1646 bail:
1647         dd->verbs_dev = idev;
1648         return ret;
1649 }
1650
1651 void ipath_unregister_ib_device(struct ipath_ibdev *dev)
1652 {
1653         struct ib_device *ibdev = &dev->ibdev;
1654
1655         disable_timer(dev->dd);
1656
1657         ib_unregister_device(ibdev);
1658
1659         if (!list_empty(&dev->pending[0]) ||
1660             !list_empty(&dev->pending[1]) ||
1661             !list_empty(&dev->pending[2]))
1662                 ipath_dev_err(dev->dd, "pending list not empty!\n");
1663         if (!list_empty(&dev->piowait))
1664                 ipath_dev_err(dev->dd, "piowait list not empty!\n");
1665         if (!list_empty(&dev->rnrwait))
1666                 ipath_dev_err(dev->dd, "rnrwait list not empty!\n");
1667         if (!ipath_mcast_tree_empty())
1668                 ipath_dev_err(dev->dd, "multicast table memory leak!\n");
1669         /*
1670          * Note that ipath_unregister_ib_device() can be called before all
1671          * the QPs are destroyed!
1672          */
1673         ipath_free_all_qps(&dev->qp_table);
1674         kfree(dev->qp_table.table);
1675         kfree(dev->lk_table.table);
1676         ib_dealloc_device(ibdev);
1677 }
1678
1679 static ssize_t show_rev(struct class_device *cdev, char *buf)
1680 {
1681         struct ipath_ibdev *dev =
1682                 container_of(cdev, struct ipath_ibdev, ibdev.class_dev);
1683
1684         return sprintf(buf, "%x\n", dev->dd->ipath_pcirev);
1685 }
1686
1687 static ssize_t show_hca(struct class_device *cdev, char *buf)
1688 {
1689         struct ipath_ibdev *dev =
1690                 container_of(cdev, struct ipath_ibdev, ibdev.class_dev);
1691         int ret;
1692
1693         ret = dev->dd->ipath_f_get_boardname(dev->dd, buf, 128);
1694         if (ret < 0)
1695                 goto bail;
1696         strcat(buf, "\n");
1697         ret = strlen(buf);
1698
1699 bail:
1700         return ret;
1701 }
1702
1703 static ssize_t show_stats(struct class_device *cdev, char *buf)
1704 {
1705         struct ipath_ibdev *dev =
1706                 container_of(cdev, struct ipath_ibdev, ibdev.class_dev);
1707         int i;
1708         int len;
1709
1710         len = sprintf(buf,
1711                       "RC resends  %d\n"
1712                       "RC no QACK  %d\n"
1713                       "RC ACKs     %d\n"
1714                       "RC SEQ NAKs %d\n"
1715                       "RC RDMA seq %d\n"
1716                       "RC RNR NAKs %d\n"
1717                       "RC OTH NAKs %d\n"
1718                       "RC timeouts %d\n"
1719                       "RC RDMA dup %d\n"
1720                       "RC stalls   %d\n"
1721                       "piobuf wait %d\n"
1722                       "no piobuf   %d\n"
1723                       "PKT drops   %d\n"
1724                       "WQE errs    %d\n",
1725                       dev->n_rc_resends, dev->n_rc_qacks, dev->n_rc_acks,
1726                       dev->n_seq_naks, dev->n_rdma_seq, dev->n_rnr_naks,
1727                       dev->n_other_naks, dev->n_timeouts,
1728                       dev->n_rdma_dup_busy, dev->n_rc_stalls, dev->n_piowait,
1729                       dev->n_no_piobuf, dev->n_pkt_drops, dev->n_wqe_errs);
1730         for (i = 0; i < ARRAY_SIZE(dev->opstats); i++) {
1731                 const struct ipath_opcode_stats *si = &dev->opstats[i];
1732
1733                 if (!si->n_packets && !si->n_bytes)
1734                         continue;
1735                 len += sprintf(buf + len, "%02x %llu/%llu\n", i,
1736                                (unsigned long long) si->n_packets,
1737                                (unsigned long long) si->n_bytes);
1738         }
1739         return len;
1740 }
1741
1742 static CLASS_DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
1743 static CLASS_DEVICE_ATTR(hca_type, S_IRUGO, show_hca, NULL);
1744 static CLASS_DEVICE_ATTR(board_id, S_IRUGO, show_hca, NULL);
1745 static CLASS_DEVICE_ATTR(stats, S_IRUGO, show_stats, NULL);
1746
1747 static struct class_device_attribute *ipath_class_attributes[] = {
1748         &class_device_attr_hw_rev,
1749         &class_device_attr_hca_type,
1750         &class_device_attr_board_id,
1751         &class_device_attr_stats
1752 };
1753
1754 static int ipath_verbs_register_sysfs(struct ib_device *dev)
1755 {
1756         int i;
1757         int ret;
1758
1759         for (i = 0; i < ARRAY_SIZE(ipath_class_attributes); ++i)
1760                 if (class_device_create_file(&dev->class_dev,
1761                                              ipath_class_attributes[i])) {
1762                         ret = 1;
1763                         goto bail;
1764                 }
1765
1766         ret = 0;
1767
1768 bail:
1769         return ret;
1770 }