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