drivers/infiniband/hw/ipath/ipath_verbs.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. 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 #include <linux/rculist.h>
  39
  40 #include "ipath_kernel.h"
  41 #include "ipath_verbs.h"
  42 #include "ipath_common.h"
  43
  44 static unsigned int ib_ipath_qp_table_size = 251;
  45 module_param_named(qp_table_size, ib_ipath_qp_table_size, uint, S_IRUGO);
  46 MODULE_PARM_DESC(qp_table_size, "QP table size");
  47
  48 unsigned int ib_ipath_lkey_table_size = 12;
  49 module_param_named(lkey_table_size, ib_ipath_lkey_table_size, uint,
  50                    S_IRUGO);
  51 MODULE_PARM_DESC(lkey_table_size,
  52                  "LKEY table size in bits (2^n, 1 <= n <= 23)");
  53
  54 static unsigned int ib_ipath_max_pds = 0xFFFF;
  55 module_param_named(max_pds, ib_ipath_max_pds, uint, S_IWUSR | S_IRUGO);
  56 MODULE_PARM_DESC(max_pds,
  57                  "Maximum number of protection domains to support");
  58
  59 static unsigned int ib_ipath_max_ahs = 0xFFFF;
  60 module_param_named(max_ahs, ib_ipath_max_ahs, uint, S_IWUSR | S_IRUGO);
  61 MODULE_PARM_DESC(max_ahs, "Maximum number of address handles to support");
  62
  63 unsigned int ib_ipath_max_cqes = 0x2FFFF;
  64 module_param_named(max_cqes, ib_ipath_max_cqes, uint, S_IWUSR | S_IRUGO);
  65 MODULE_PARM_DESC(max_cqes,
  66                  "Maximum number of completion queue entries to support");
  67
  68 unsigned int ib_ipath_max_cqs = 0x1FFFF;
  69 module_param_named(max_cqs, ib_ipath_max_cqs, uint, S_IWUSR | S_IRUGO);
  70 MODULE_PARM_DESC(max_cqs, "Maximum number of completion queues to support");
  71
  72 unsigned int ib_ipath_max_qp_wrs = 0x3FFF;
  73 module_param_named(max_qp_wrs, ib_ipath_max_qp_wrs, uint,
  74                    S_IWUSR | S_IRUGO);
  75 MODULE_PARM_DESC(max_qp_wrs, "Maximum number of QP WRs to support");
  76
  77 unsigned int ib_ipath_max_qps = 16384;
  78 module_param_named(max_qps, ib_ipath_max_qps, uint, S_IWUSR | S_IRUGO);
  79 MODULE_PARM_DESC(max_qps, "Maximum number of QPs to support");
  80
  81 unsigned int ib_ipath_max_sges = 0x60;
  82 module_param_named(max_sges, ib_ipath_max_sges, uint, S_IWUSR | S_IRUGO);
  83 MODULE_PARM_DESC(max_sges, "Maximum number of SGEs to support");
  84
  85 unsigned int ib_ipath_max_mcast_grps = 16384;
  86 module_param_named(max_mcast_grps, ib_ipath_max_mcast_grps, uint,
  87                    S_IWUSR | S_IRUGO);
  88 MODULE_PARM_DESC(max_mcast_grps,
  89                  "Maximum number of multicast groups to support");
  90
  91 unsigned int ib_ipath_max_mcast_qp_attached = 16;
  92 module_param_named(max_mcast_qp_attached, ib_ipath_max_mcast_qp_attached,
  93                    uint, S_IWUSR | S_IRUGO);
  94 MODULE_PARM_DESC(max_mcast_qp_attached,
  95                  "Maximum number of attached QPs to support");
  96
  97 unsigned int ib_ipath_max_srqs = 1024;
  98 module_param_named(max_srqs, ib_ipath_max_srqs, uint, S_IWUSR | S_IRUGO);
  99 MODULE_PARM_DESC(max_srqs, "Maximum number of SRQs to support");
 100
 101 unsigned int ib_ipath_max_srq_sges = 128;
 102 module_param_named(max_srq_sges, ib_ipath_max_srq_sges,
 103                    uint, S_IWUSR | S_IRUGO);
 104 MODULE_PARM_DESC(max_srq_sges, "Maximum number of SRQ SGEs to support");
 105
 106 unsigned int ib_ipath_max_srq_wrs = 0x1FFFF;
 107 module_param_named(max_srq_wrs, ib_ipath_max_srq_wrs,
 108                    uint, S_IWUSR | S_IRUGO);
 109 MODULE_PARM_DESC(max_srq_wrs, "Maximum number of SRQ WRs support");
 110
 111 static unsigned int ib_ipath_disable_sma;
 112 module_param_named(disable_sma, ib_ipath_disable_sma, uint, S_IWUSR | S_IRUGO);
 113 MODULE_PARM_DESC(disable_sma, "Disable the SMA");
 114
 115 /*
 116  * Note that it is OK to post send work requests in the SQE and ERR
 117  * states; ipath_do_send() will process them and generate error
 118  * completions as per IB 1.2 C10-96.
 119  */
 120 const int ib_ipath_state_ops[IB_QPS_ERR + 1] = {
 121         [IB_QPS_RESET] = 0,
 122         [IB_QPS_INIT] = IPATH_POST_RECV_OK,
 123         [IB_QPS_RTR] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK,
 124         [IB_QPS_RTS] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
 125             IPATH_POST_SEND_OK | IPATH_PROCESS_SEND_OK |
 126             IPATH_PROCESS_NEXT_SEND_OK,
 127         [IB_QPS_SQD] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
 128             IPATH_POST_SEND_OK | IPATH_PROCESS_SEND_OK,
 129         [IB_QPS_SQE] = IPATH_POST_RECV_OK | IPATH_PROCESS_RECV_OK |
 130             IPATH_POST_SEND_OK | IPATH_FLUSH_SEND,
 131         [IB_QPS_ERR] = IPATH_POST_RECV_OK | IPATH_FLUSH_RECV |
 132             IPATH_POST_SEND_OK | IPATH_FLUSH_SEND,
 133 };
 134
 135 struct ipath_ucontext {
 136         struct ib_ucontext ibucontext;
 137 };
 138
 139 static inline struct ipath_ucontext *to_iucontext(struct ib_ucontext
 140                                                   *ibucontext)
 141 {
 142         return container_of(ibucontext, struct ipath_ucontext, ibucontext);
 143 }
 144
 145 /*
 146  * Translate ib_wr_opcode into ib_wc_opcode.
 147  */
 148 const enum ib_wc_opcode ib_ipath_wc_opcode[] = {
 149         [IB_WR_RDMA_WRITE] = IB_WC_RDMA_WRITE,
 150         [IB_WR_RDMA_WRITE_WITH_IMM] = IB_WC_RDMA_WRITE,
 151         [IB_WR_SEND] = IB_WC_SEND,
 152         [IB_WR_SEND_WITH_IMM] = IB_WC_SEND,
 153         [IB_WR_RDMA_READ] = IB_WC_RDMA_READ,
 154         [IB_WR_ATOMIC_CMP_AND_SWP] = IB_WC_COMP_SWAP,
 155         [IB_WR_ATOMIC_FETCH_AND_ADD] = IB_WC_FETCH_ADD
 156 };
 157
 158 /*
 159  * System image GUID.
 160  */
 161 static __be64 sys_image_guid;
 162
 163 /**
 164  * ipath_copy_sge - copy data to SGE memory
 165  * @ss: the SGE state
 166  * @data: the data to copy
 167  * @length: the length of the data
 168  */
 169 void ipath_copy_sge(struct ipath_sge_state *ss, void *data, u32 length)
 170 {
 171         struct ipath_sge *sge = &ss->sge;
 172
 173         while (length) {
 174                 u32 len = sge->length;
 175
 176                 if (len > length)
 177                         len = length;
 178                 if (len > sge->sge_length)
 179                         len = sge->sge_length;
 180                 BUG_ON(len == 0);
 181                 memcpy(sge->vaddr, data, len);
 182                 sge->vaddr += len;
 183                 sge->length -= len;
 184                 sge->sge_length -= len;
 185                 if (sge->sge_length == 0) {
 186                         if (--ss->num_sge)
 187                                 *sge = *ss->sg_list++;
 188                 } else if (sge->length == 0 && sge->mr != NULL) {
 189                         if (++sge->n >= IPATH_SEGSZ) {
 190                                 if (++sge->m >= sge->mr->mapsz)
 191                                         break;
 192                                 sge->n = 0;
 193                         }
 194                         sge->vaddr =
 195                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 196                         sge->length =
 197                                 sge->mr->map[sge->m]->segs[sge->n].length;
 198                 }
 199                 data += len;
 200                 length -= len;
 201         }
 202 }
 203
 204 /**
 205  * ipath_skip_sge - skip over SGE memory - XXX almost dup of prev func
 206  * @ss: the SGE state
 207  * @length: the number of bytes to skip
 208  */
 209 void ipath_skip_sge(struct ipath_sge_state *ss, u32 length)
 210 {
 211         struct ipath_sge *sge = &ss->sge;
 212
 213         while (length) {
 214                 u32 len = sge->length;
 215
 216                 if (len > length)
 217                         len = length;
 218                 if (len > sge->sge_length)
 219                         len = sge->sge_length;
 220                 BUG_ON(len == 0);
 221                 sge->vaddr += len;
 222                 sge->length -= len;
 223                 sge->sge_length -= len;
 224                 if (sge->sge_length == 0) {
 225                         if (--ss->num_sge)
 226                                 *sge = *ss->sg_list++;
 227                 } else if (sge->length == 0 && sge->mr != NULL) {
 228                         if (++sge->n >= IPATH_SEGSZ) {
 229                                 if (++sge->m >= sge->mr->mapsz)
 230                                         break;
 231                                 sge->n = 0;
 232                         }
 233                         sge->vaddr =
 234                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 235                         sge->length =
 236                                 sge->mr->map[sge->m]->segs[sge->n].length;
 237                 }
 238                 length -= len;
 239         }
 240 }
 241
 242 /*
 243  * Count the number of DMA descriptors needed to send length bytes of data.
 244  * Don't modify the ipath_sge_state to get the count.
 245  * Return zero if any of the segments is not aligned.
 246  */
 247 static u32 ipath_count_sge(struct ipath_sge_state *ss, u32 length)
 248 {
 249         struct ipath_sge *sg_list = ss->sg_list;
 250         struct ipath_sge sge = ss->sge;
 251         u8 num_sge = ss->num_sge;
 252         u32 ndesc = 1;  /* count the header */
 253
 254         while (length) {
 255                 u32 len = sge.length;
 256
 257                 if (len > length)
 258                         len = length;
 259                 if (len > sge.sge_length)
 260                         len = sge.sge_length;
 261                 BUG_ON(len == 0);
 262                 if (((long) sge.vaddr & (sizeof(u32) - 1)) ||
 263                     (len != length && (len & (sizeof(u32) - 1)))) {
 264                         ndesc = 0;
 265                         break;
 266                 }
 267                 ndesc++;
 268                 sge.vaddr += len;
 269                 sge.length -= len;
 270                 sge.sge_length -= len;
 271                 if (sge.sge_length == 0) {
 272                         if (--num_sge)
 273                                 sge = *sg_list++;
 274                 } else if (sge.length == 0 && sge.mr != NULL) {
 275                         if (++sge.n >= IPATH_SEGSZ) {
 276                                 if (++sge.m >= sge.mr->mapsz)
 277                                         break;
 278                                 sge.n = 0;
 279                         }
 280                         sge.vaddr =
 281                                 sge.mr->map[sge.m]->segs[sge.n].vaddr;
 282                         sge.length =
 283                                 sge.mr->map[sge.m]->segs[sge.n].length;
 284                 }
 285                 length -= len;
 286         }
 287         return ndesc;
 288 }
 289
 290 /*
 291  * Copy from the SGEs to the data buffer.
 292  */
 293 static void ipath_copy_from_sge(void *data, struct ipath_sge_state *ss,
 294                                 u32 length)
 295 {
 296         struct ipath_sge *sge = &ss->sge;
 297
 298         while (length) {
 299                 u32 len = sge->length;
 300
 301                 if (len > length)
 302                         len = length;
 303                 if (len > sge->sge_length)
 304                         len = sge->sge_length;
 305                 BUG_ON(len == 0);
 306                 memcpy(data, sge->vaddr, len);
 307                 sge->vaddr += len;
 308                 sge->length -= len;
 309                 sge->sge_length -= len;
 310                 if (sge->sge_length == 0) {
 311                         if (--ss->num_sge)
 312                                 *sge = *ss->sg_list++;
 313                 } else if (sge->length == 0 && sge->mr != NULL) {
 314                         if (++sge->n >= IPATH_SEGSZ) {
 315                                 if (++sge->m >= sge->mr->mapsz)
 316                                         break;
 317                                 sge->n = 0;
 318                         }
 319                         sge->vaddr =
 320                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 321                         sge->length =
 322                                 sge->mr->map[sge->m]->segs[sge->n].length;
 323                 }
 324                 data += len;
 325                 length -= len;
 326         }
 327 }
 328
 329 /**
 330  * ipath_post_one_send - post one RC, UC, or UD send work request
 331  * @qp: the QP to post on
 332  * @wr: the work request to send
 333  */
 334 static int ipath_post_one_send(struct ipath_qp *qp, struct ib_send_wr *wr)
 335 {
 336         struct ipath_swqe *wqe;
 337         u32 next;
 338         int i;
 339         int j;
 340         int acc;
 341         int ret;
 342         unsigned long flags;
 343
 344         spin_lock_irqsave(&qp->s_lock, flags);
 345
 346         /* Check that state is OK to post send. */
 347         if (unlikely(!(ib_ipath_state_ops[qp->state] & IPATH_POST_SEND_OK)))
 348                 goto bail_inval;
 349
 350         /* IB spec says that num_sge == 0 is OK. */
 351         if (wr->num_sge > qp->s_max_sge)
 352                 goto bail_inval;
 353
 354         /*
 355          * Don't allow RDMA reads or atomic operations on UC or
 356          * undefined operations.
 357          * Make sure buffer is large enough to hold the result for atomics.
 358          */
 359         if (qp->ibqp.qp_type == IB_QPT_UC) {
 360                 if ((unsigned) wr->opcode >= IB_WR_RDMA_READ)
 361                         goto bail_inval;
 362         } else if (qp->ibqp.qp_type == IB_QPT_UD) {
 363                 /* Check UD opcode */
 364                 if (wr->opcode != IB_WR_SEND &&
 365                     wr->opcode != IB_WR_SEND_WITH_IMM)
 366                         goto bail_inval;
 367                 /* Check UD destination address PD */
 368                 if (qp->ibqp.pd != wr->wr.ud.ah->pd)
 369                         goto bail_inval;
 370         } else if ((unsigned) wr->opcode > IB_WR_ATOMIC_FETCH_AND_ADD)
 371                 goto bail_inval;
 372         else if (wr->opcode >= IB_WR_ATOMIC_CMP_AND_SWP &&
 373                    (wr->num_sge == 0 ||
 374                     wr->sg_list[0].length < sizeof(u64) ||
 375                     wr->sg_list[0].addr & (sizeof(u64) - 1)))
 376                 goto bail_inval;
 377         else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic)
 378                 goto bail_inval;
 379
 380         next = qp->s_head + 1;
 381         if (next >= qp->s_size)
 382                 next = 0;
 383         if (next == qp->s_last) {
 384                 ret = -ENOMEM;
 385                 goto bail;
 386         }
 387
 388         wqe = get_swqe_ptr(qp, qp->s_head);
 389         wqe->wr = *wr;
 390         wqe->length = 0;
 391         if (wr->num_sge) {
 392                 acc = wr->opcode >= IB_WR_RDMA_READ ?
 393                         IB_ACCESS_LOCAL_WRITE : 0;
 394                 for (i = 0, j = 0; i < wr->num_sge; i++) {
 395                         u32 length = wr->sg_list[i].length;
 396                         int ok;
 397
 398                         if (length == 0)
 399                                 continue;
 400                         ok = ipath_lkey_ok(qp, &wqe->sg_list[j],
 401                                            &wr->sg_list[i], acc);
 402                         if (!ok)
 403                                 goto bail_inval;
 404                         wqe->length += length;
 405                         j++;
 406                 }
 407                 wqe->wr.num_sge = j;
 408         }
 409         if (qp->ibqp.qp_type == IB_QPT_UC ||
 410             qp->ibqp.qp_type == IB_QPT_RC) {
 411                 if (wqe->length > 0x80000000U)
 412                         goto bail_inval;
 413         } else if (wqe->length > to_idev(qp->ibqp.device)->dd->ipath_ibmtu)
 414                 goto bail_inval;
 415         wqe->ssn = qp->s_ssn++;
 416         qp->s_head = next;
 417
 418         ret = 0;
 419         goto bail;
 420
 421 bail_inval:
 422         ret = -EINVAL;
 423 bail:
 424         spin_unlock_irqrestore(&qp->s_lock, flags);
 425         return ret;
 426 }
 427
 428 /**
 429  * ipath_post_send - post a send on a QP
 430  * @ibqp: the QP to post the send on
 431  * @wr: the list of work requests to post
 432  * @bad_wr: the first bad WR is put here
 433  *
 434  * This may be called from interrupt context.
 435  */
 436 static int ipath_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 437                            struct ib_send_wr **bad_wr)
 438 {
 439         struct ipath_qp *qp = to_iqp(ibqp);
 440         int err = 0;
 441
 442         for (; wr; wr = wr->next) {
 443                 err = ipath_post_one_send(qp, wr);
 444                 if (err) {
 445                         *bad_wr = wr;
 446                         goto bail;
 447                 }
 448         }
 449
 450         /* Try to do the send work in the caller's context. */
 451         ipath_do_send((unsigned long) qp);
 452
 453 bail:
 454         return err;
 455 }
 456
 457 /**
 458  * ipath_post_receive - post a receive on a QP
 459  * @ibqp: the QP to post the receive on
 460  * @wr: the WR to post
 461  * @bad_wr: the first bad WR is put here
 462  *
 463  * This may be called from interrupt context.
 464  */
 465 static int ipath_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 466                               struct ib_recv_wr **bad_wr)
 467 {
 468         struct ipath_qp *qp = to_iqp(ibqp);
 469         struct ipath_rwq *wq = qp->r_rq.wq;
 470         unsigned long flags;
 471         int ret;
 472
 473         /* Check that state is OK to post receive. */
 474         if (!(ib_ipath_state_ops[qp->state] & IPATH_POST_RECV_OK) || !wq) {
 475                 *bad_wr = wr;
 476                 ret = -EINVAL;
 477                 goto bail;
 478         }
 479
 480         for (; wr; wr = wr->next) {
 481                 struct ipath_rwqe *wqe;
 482                 u32 next;
 483                 int i;
 484
 485                 if ((unsigned) wr->num_sge > qp->r_rq.max_sge) {
 486                         *bad_wr = wr;
 487                         ret = -EINVAL;
 488                         goto bail;
 489                 }
 490
 491                 spin_lock_irqsave(&qp->r_rq.lock, flags);
 492                 next = wq->head + 1;
 493                 if (next >= qp->r_rq.size)
 494                         next = 0;
 495                 if (next == wq->tail) {
 496                         spin_unlock_irqrestore(&qp->r_rq.lock, flags);
 497                         *bad_wr = wr;
 498                         ret = -ENOMEM;
 499                         goto bail;
 500                 }
 501
 502                 wqe = get_rwqe_ptr(&qp->r_rq, wq->head);
 503                 wqe->wr_id = wr->wr_id;
 504                 wqe->num_sge = wr->num_sge;
 505                 for (i = 0; i < wr->num_sge; i++)
 506                         wqe->sg_list[i] = wr->sg_list[i];
 507                 /* Make sure queue entry is written before the head index. */
 508                 smp_wmb();
 509                 wq->head = next;
 510                 spin_unlock_irqrestore(&qp->r_rq.lock, flags);
 511         }
 512         ret = 0;
 513
 514 bail:
 515         return ret;
 516 }
 517
 518 /**
 519  * ipath_qp_rcv - processing an incoming packet on a QP
 520  * @dev: the device the packet came on
 521  * @hdr: the packet header
 522  * @has_grh: true if the packet has a GRH
 523  * @data: the packet data
 524  * @tlen: the packet length
 525  * @qp: the QP the packet came on
 526  *
 527  * This is called from ipath_ib_rcv() to process an incoming packet
 528  * for the given QP.
 529  * Called at interrupt level.
 530  */
 531 static void ipath_qp_rcv(struct ipath_ibdev *dev,
 532                          struct ipath_ib_header *hdr, int has_grh,
 533                          void *data, u32 tlen, struct ipath_qp *qp)
 534 {
 535         /* Check for valid receive state. */
 536         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
 537                 dev->n_pkt_drops++;
 538                 return;
 539         }
 540
 541         switch (qp->ibqp.qp_type) {
 542         case IB_QPT_SMI:
 543         case IB_QPT_GSI:
 544                 if (ib_ipath_disable_sma)
 545                         break;
 546                 /* FALLTHROUGH */
 547         case IB_QPT_UD:
 548                 ipath_ud_rcv(dev, hdr, has_grh, data, tlen, qp);
 549                 break;
 550
 551         case IB_QPT_RC:
 552                 ipath_rc_rcv(dev, hdr, has_grh, data, tlen, qp);
 553                 break;
 554
 555         case IB_QPT_UC:
 556                 ipath_uc_rcv(dev, hdr, has_grh, data, tlen, qp);
 557                 break;
 558
 559         default:
 560                 break;
 561         }
 562 }
 563
 564 /**
 565  * ipath_ib_rcv - process an incoming packet
 566  * @arg: the device pointer
 567  * @rhdr: the header of the packet
 568  * @data: the packet data
 569  * @tlen: the packet length
 570  *
 571  * This is called from ipath_kreceive() to process an incoming packet at
 572  * interrupt level. Tlen is the length of the header + data + CRC in bytes.
 573  */
 574 void ipath_ib_rcv(struct ipath_ibdev *dev, void *rhdr, void *data,
 575                   u32 tlen)
 576 {
 577         struct ipath_ib_header *hdr = rhdr;
 578         struct ipath_other_headers *ohdr;
 579         struct ipath_qp *qp;
 580         u32 qp_num;
 581         int lnh;
 582         u8 opcode;
 583         u16 lid;
 584
 585         if (unlikely(dev == NULL))
 586                 goto bail;
 587
 588         if (unlikely(tlen < 24)) {      /* LRH+BTH+CRC */
 589                 dev->rcv_errors++;
 590                 goto bail;
 591         }
 592
 593         /* Check for a valid destination LID (see ch. 7.11.1). */
 594         lid = be16_to_cpu(hdr->lrh[1]);
 595         if (lid < IPATH_MULTICAST_LID_BASE) {
 596                 lid &= ~((1 << dev->dd->ipath_lmc) - 1);
 597                 if (unlikely(lid != dev->dd->ipath_lid)) {
 598                         dev->rcv_errors++;
 599                         goto bail;
 600                 }
 601         }
 602
 603         /* Check for GRH */
 604         lnh = be16_to_cpu(hdr->lrh[0]) & 3;
 605         if (lnh == IPATH_LRH_BTH)
 606                 ohdr = &hdr->u.oth;
 607         else if (lnh == IPATH_LRH_GRH)
 608                 ohdr = &hdr->u.l.oth;
 609         else {
 610                 dev->rcv_errors++;
 611                 goto bail;
 612         }
 613
 614         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 615         dev->opstats[opcode].n_bytes += tlen;
 616         dev->opstats[opcode].n_packets++;
 617
 618         /* Get the destination QP number. */
 619         qp_num = be32_to_cpu(ohdr->bth[1]) & IPATH_QPN_MASK;
 620         if (qp_num == IPATH_MULTICAST_QPN) {
 621                 struct ipath_mcast *mcast;
 622                 struct ipath_mcast_qp *p;
 623
 624                 if (lnh != IPATH_LRH_GRH) {
 625                         dev->n_pkt_drops++;
 626                         goto bail;
 627                 }
 628                 mcast = ipath_mcast_find(&hdr->u.l.grh.dgid);
 629                 if (mcast == NULL) {
 630                         dev->n_pkt_drops++;
 631                         goto bail;
 632                 }
 633                 dev->n_multicast_rcv++;
 634                 list_for_each_entry_rcu(p, &mcast->qp_list, list)
 635                         ipath_qp_rcv(dev, hdr, 1, data, tlen, p->qp);
 636                 /*
 637                  * Notify ipath_multicast_detach() if it is waiting for us
 638                  * to finish.
 639                  */
 640                 if (atomic_dec_return(&mcast->refcount) <= 1)
 641                         wake_up(&mcast->wait);
 642         } else {
 643                 qp = ipath_lookup_qpn(&dev->qp_table, qp_num);
 644                 if (qp) {
 645                         dev->n_unicast_rcv++;
 646                         ipath_qp_rcv(dev, hdr, lnh == IPATH_LRH_GRH, data,
 647                                      tlen, qp);
 648                         /*
 649                          * Notify ipath_destroy_qp() if it is waiting
 650                          * for us to finish.
 651                          */
 652                         if (atomic_dec_and_test(&qp->refcount))
 653                                 wake_up(&qp->wait);
 654                 } else
 655                         dev->n_pkt_drops++;
 656         }
 657
 658 bail:;
 659 }
 660
 661 /**
 662  * ipath_ib_timer - verbs timer
 663  * @arg: the device pointer
 664  *
 665  * This is called from ipath_do_rcv_timer() at interrupt level to check for
 666  * QPs which need retransmits and to collect performance numbers.
 667  */
 668 static void ipath_ib_timer(struct ipath_ibdev *dev)
 669 {
 670         struct ipath_qp *resend = NULL;
 671         struct ipath_qp *rnr = NULL;
 672         struct list_head *last;
 673         struct ipath_qp *qp;
 674         unsigned long flags;
 675
 676         if (dev == NULL)
 677                 return;
 678
 679         spin_lock_irqsave(&dev->pending_lock, flags);
 680         /* Start filling the next pending queue. */
 681         if (++dev->pending_index >= ARRAY_SIZE(dev->pending))
 682                 dev->pending_index = 0;
 683         /* Save any requests still in the new queue, they have timed out. */
 684         last = &dev->pending[dev->pending_index];
 685         while (!list_empty(last)) {
 686                 qp = list_entry(last->next, struct ipath_qp, timerwait);
 687                 list_del_init(&qp->timerwait);
 688                 qp->timer_next = resend;
 689                 resend = qp;
 690                 atomic_inc(&qp->refcount);
 691         }
 692         last = &dev->rnrwait;
 693         if (!list_empty(last)) {
 694                 qp = list_entry(last->next, struct ipath_qp, timerwait);
 695                 if (--qp->s_rnr_timeout == 0) {
 696                         do {
 697                                 list_del_init(&qp->timerwait);
 698                                 qp->timer_next = rnr;
 699                                 rnr = qp;
 700                                 atomic_inc(&qp->refcount);
 701                                 if (list_empty(last))
 702                                         break;
 703                                 qp = list_entry(last->next, struct ipath_qp,
 704                                                 timerwait);
 705                         } while (qp->s_rnr_timeout == 0);
 706                 }
 707         }
 708         /*
 709          * We should only be in the started state if pma_sample_start != 0
 710          */
 711         if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_STARTED &&
 712             --dev->pma_sample_start == 0) {
 713                 dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_RUNNING;
 714                 ipath_snapshot_counters(dev->dd, &dev->ipath_sword,
 715                                         &dev->ipath_rword,
 716                                         &dev->ipath_spkts,
 717                                         &dev->ipath_rpkts,
 718                                         &dev->ipath_xmit_wait);
 719         }
 720         if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_RUNNING) {
 721                 if (dev->pma_sample_interval == 0) {
 722                         u64 ta, tb, tc, td, te;
 723
 724                         dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_DONE;
 725                         ipath_snapshot_counters(dev->dd, &ta, &tb,
 726                                                 &tc, &td, &te);
 727
 728                         dev->ipath_sword = ta - dev->ipath_sword;
 729                         dev->ipath_rword = tb - dev->ipath_rword;
 730                         dev->ipath_spkts = tc - dev->ipath_spkts;
 731                         dev->ipath_rpkts = td - dev->ipath_rpkts;
 732                         dev->ipath_xmit_wait = te - dev->ipath_xmit_wait;
 733                 }
 734                 else
 735                         dev->pma_sample_interval--;
 736         }
 737         spin_unlock_irqrestore(&dev->pending_lock, flags);
 738
 739         /* XXX What if timer fires again while this is running? */
 740         while (resend != NULL) {
 741                 qp = resend;
 742                 resend = qp->timer_next;
 743
 744                 spin_lock_irqsave(&qp->s_lock, flags);
 745                 if (qp->s_last != qp->s_tail &&
 746                     ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) {
 747                         dev->n_timeouts++;
 748                         ipath_restart_rc(qp, qp->s_last_psn + 1);
 749                 }
 750                 spin_unlock_irqrestore(&qp->s_lock, flags);
 751
 752                 /* Notify ipath_destroy_qp() if it is waiting. */
 753                 if (atomic_dec_and_test(&qp->refcount))
 754                         wake_up(&qp->wait);
 755         }
 756         while (rnr != NULL) {
 757                 qp = rnr;
 758                 rnr = qp->timer_next;
 759
 760                 spin_lock_irqsave(&qp->s_lock, flags);
 761                 if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)
 762                         ipath_schedule_send(qp);
 763                 spin_unlock_irqrestore(&qp->s_lock, flags);
 764
 765                 /* Notify ipath_destroy_qp() if it is waiting. */
 766                 if (atomic_dec_and_test(&qp->refcount))
 767                         wake_up(&qp->wait);
 768         }
 769 }
 770
 771 static void update_sge(struct ipath_sge_state *ss, u32 length)
 772 {
 773         struct ipath_sge *sge = &ss->sge;
 774
 775         sge->vaddr += length;
 776         sge->length -= length;
 777         sge->sge_length -= length;
 778         if (sge->sge_length == 0) {
 779                 if (--ss->num_sge)
 780                         *sge = *ss->sg_list++;
 781         } else if (sge->length == 0 && sge->mr != NULL) {
 782                 if (++sge->n >= IPATH_SEGSZ) {
 783                         if (++sge->m >= sge->mr->mapsz)
 784                                 return;
 785                         sge->n = 0;
 786                 }
 787                 sge->vaddr = sge->mr->map[sge->m]->segs[sge->n].vaddr;
 788                 sge->length = sge->mr->map[sge->m]->segs[sge->n].length;
 789         }
 790 }
 791
 792 #ifdef __LITTLE_ENDIAN
 793 static inline u32 get_upper_bits(u32 data, u32 shift)
 794 {
 795         return data >> shift;
 796 }
 797
 798 static inline u32 set_upper_bits(u32 data, u32 shift)
 799 {
 800         return data << shift;
 801 }
 802
 803 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
 804 {
 805         data <<= ((sizeof(u32) - n) * BITS_PER_BYTE);
 806         data >>= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
 807         return data;
 808 }
 809 #else
 810 static inline u32 get_upper_bits(u32 data, u32 shift)
 811 {
 812         return data << shift;
 813 }
 814
 815 static inline u32 set_upper_bits(u32 data, u32 shift)
 816 {
 817         return data >> shift;
 818 }
 819
 820 static inline u32 clear_upper_bytes(u32 data, u32 n, u32 off)
 821 {
 822         data >>= ((sizeof(u32) - n) * BITS_PER_BYTE);
 823         data <<= ((sizeof(u32) - n - off) * BITS_PER_BYTE);
 824         return data;
 825 }
 826 #endif
 827
 828 static void copy_io(u32 __iomem *piobuf, struct ipath_sge_state *ss,
 829                     u32 length, unsigned flush_wc)
 830 {
 831         u32 extra = 0;
 832         u32 data = 0;
 833         u32 last;
 834
 835         while (1) {
 836                 u32 len = ss->sge.length;
 837                 u32 off;
 838
 839                 if (len > length)
 840                         len = length;
 841                 if (len > ss->sge.sge_length)
 842                         len = ss->sge.sge_length;
 843                 BUG_ON(len == 0);
 844                 /* If the source address is not aligned, try to align it. */
 845                 off = (unsigned long)ss->sge.vaddr & (sizeof(u32) - 1);
 846                 if (off) {
 847                         u32 *addr = (u32 *)((unsigned long)ss->sge.vaddr &
 848                                             ~(sizeof(u32) - 1));
 849                         u32 v = get_upper_bits(*addr, off * BITS_PER_BYTE);
 850                         u32 y;
 851
 852                         y = sizeof(u32) - off;
 853                         if (len > y)
 854                                 len = y;
 855                         if (len + extra >= sizeof(u32)) {
 856                                 data |= set_upper_bits(v, extra *
 857                                                        BITS_PER_BYTE);
 858                                 len = sizeof(u32) - extra;
 859                                 if (len == length) {
 860                                         last = data;
 861                                         break;
 862                                 }
 863                                 __raw_writel(data, piobuf);
 864                                 piobuf++;
 865                                 extra = 0;
 866                                 data = 0;
 867                         } else {
 868                                 /* Clear unused upper bytes */
 869                                 data |= clear_upper_bytes(v, len, extra);
 870                                 if (len == length) {
 871                                         last = data;
 872                                         break;
 873                                 }
 874                                 extra += len;
 875                         }
 876                 } else if (extra) {
 877                         /* Source address is aligned. */
 878                         u32 *addr = (u32 *) ss->sge.vaddr;
 879                         int shift = extra * BITS_PER_BYTE;
 880                         int ushift = 32 - shift;
 881                         u32 l = len;
 882
 883                         while (l >= sizeof(u32)) {
 884                                 u32 v = *addr;
 885
 886                                 data |= set_upper_bits(v, shift);
 887                                 __raw_writel(data, piobuf);
 888                                 data = get_upper_bits(v, ushift);
 889                                 piobuf++;
 890                                 addr++;
 891                                 l -= sizeof(u32);
 892                         }
 893                         /*
 894                          * We still have 'extra' number of bytes leftover.
 895                          */
 896                         if (l) {
 897                                 u32 v = *addr;
 898
 899                                 if (l + extra >= sizeof(u32)) {
 900                                         data |= set_upper_bits(v, shift);
 901                                         len -= l + extra - sizeof(u32);
 902                                         if (len == length) {
 903                                                 last = data;
 904                                                 break;
 905                                         }
 906                                         __raw_writel(data, piobuf);
 907                                         piobuf++;
 908                                         extra = 0;
 909                                         data = 0;
 910                                 } else {
 911                                         /* Clear unused upper bytes */
 912                                         data |= clear_upper_bytes(v, l,
 913                                                                   extra);
 914                                         if (len == length) {
 915                                                 last = data;
 916                                                 break;
 917                                         }
 918                                         extra += l;
 919                                 }
 920                         } else if (len == length) {
 921                                 last = data;
 922                                 break;
 923                         }
 924                 } else if (len == length) {
 925                         u32 w;
 926
 927                         /*
 928                          * Need to round up for the last dword in the
 929                          * packet.
 930                          */
 931                         w = (len + 3) >> 2;
 932                         __iowrite32_copy(piobuf, ss->sge.vaddr, w - 1);
 933                         piobuf += w - 1;
 934                         last = ((u32 *) ss->sge.vaddr)[w - 1];
 935                         break;
 936                 } else {
 937                         u32 w = len >> 2;
 938
 939                         __iowrite32_copy(piobuf, ss->sge.vaddr, w);
 940                         piobuf += w;
 941
 942                         extra = len & (sizeof(u32) - 1);
 943                         if (extra) {
 944                                 u32 v = ((u32 *) ss->sge.vaddr)[w];
 945
 946                                 /* Clear unused upper bytes */
 947                                 data = clear_upper_bytes(v, extra, 0);
 948                         }
 949                 }
 950                 update_sge(ss, len);
 951                 length -= len;
 952         }
 953         /* Update address before sending packet. */
 954         update_sge(ss, length);
 955         if (flush_wc) {
 956                 /* must flush early everything before trigger word */
 957                 ipath_flush_wc();
 958                 __raw_writel(last, piobuf);
 959                 /* be sure trigger word is written */
 960                 ipath_flush_wc();
 961         } else
 962                 __raw_writel(last, piobuf);
 963 }
 964
 965 /*
 966  * Convert IB rate to delay multiplier.
 967  */
 968 unsigned ipath_ib_rate_to_mult(enum ib_rate rate)
 969 {
 970         switch (rate) {
 971         case IB_RATE_2_5_GBPS: return 8;
 972         case IB_RATE_5_GBPS:   return 4;
 973         case IB_RATE_10_GBPS:  return 2;
 974         case IB_RATE_20_GBPS:  return 1;
 975         default:               return 0;
 976         }
 977 }
 978
 979 /*
 980  * Convert delay multiplier to IB rate
 981  */
 982 static enum ib_rate ipath_mult_to_ib_rate(unsigned mult)
 983 {
 984         switch (mult) {
 985         case 8:  return IB_RATE_2_5_GBPS;
 986         case 4:  return IB_RATE_5_GBPS;
 987         case 2:  return IB_RATE_10_GBPS;
 988         case 1:  return IB_RATE_20_GBPS;
 989         default: return IB_RATE_PORT_CURRENT;
 990         }
 991 }
 992
 993 static inline struct ipath_verbs_txreq *get_txreq(struct ipath_ibdev *dev)
 994 {
 995         struct ipath_verbs_txreq *tx = NULL;
 996         unsigned long flags;
 997
 998         spin_lock_irqsave(&dev->pending_lock, flags);
 999         if (!list_empty(&dev->txreq_free)) {
1000                 struct list_head *l = dev->txreq_free.next;
1001
1002                 list_del(l);
1003                 tx = list_entry(l, struct ipath_verbs_txreq, txreq.list);
1004         }
1005         spin_unlock_irqrestore(&dev->pending_lock, flags);
1006         return tx;
1007 }
1008
1009 static inline void put_txreq(struct ipath_ibdev *dev,
1010                              struct ipath_verbs_txreq *tx)
1011 {
1012         unsigned long flags;
1013
1014         spin_lock_irqsave(&dev->pending_lock, flags);
1015         list_add(&tx->txreq.list, &dev->txreq_free);
1016         spin_unlock_irqrestore(&dev->pending_lock, flags);
1017 }
1018
1019 static void sdma_complete(void *cookie, int status)
1020 {
1021         struct ipath_verbs_txreq *tx = cookie;
1022         struct ipath_qp *qp = tx->qp;
1023         struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
1024         unsigned int flags;
1025         enum ib_wc_status ibs = status == IPATH_SDMA_TXREQ_S_OK ?
1026                 IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR;
1027
1028         if (atomic_dec_and_test(&qp->s_dma_busy)) {
1029                 spin_lock_irqsave(&qp->s_lock, flags);
1030                 if (tx->wqe)
1031                         ipath_send_complete(qp, tx->wqe, ibs);
1032                 if ((ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND &&
1033                      qp->s_last != qp->s_head) ||
1034                     (qp->s_flags & IPATH_S_WAIT_DMA))
1035                         ipath_schedule_send(qp);
1036                 spin_unlock_irqrestore(&qp->s_lock, flags);
1037                 wake_up(&qp->wait_dma);
1038         } else if (tx->wqe) {
1039                 spin_lock_irqsave(&qp->s_lock, flags);
1040                 ipath_send_complete(qp, tx->wqe, ibs);
1041                 spin_unlock_irqrestore(&qp->s_lock, flags);
1042         }
1043
1044         if (tx->txreq.flags & IPATH_SDMA_TXREQ_F_FREEBUF)
1045                 kfree(tx->txreq.map_addr);
1046         put_txreq(dev, tx);
1047
1048         if (atomic_dec_and_test(&qp->refcount))
1049                 wake_up(&qp->wait);
1050 }
1051
1052 static void decrement_dma_busy(struct ipath_qp *qp)
1053 {
1054         unsigned int flags;
1055
1056         if (atomic_dec_and_test(&qp->s_dma_busy)) {
1057                 spin_lock_irqsave(&qp->s_lock, flags);
1058                 if ((ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND &&
1059                      qp->s_last != qp->s_head) ||
1060                     (qp->s_flags & IPATH_S_WAIT_DMA))
1061                         ipath_schedule_send(qp);
1062                 spin_unlock_irqrestore(&qp->s_lock, flags);
1063                 wake_up(&qp->wait_dma);
1064         }
1065 }
1066
1067 /*
1068  * Compute the number of clock cycles of delay before sending the next packet.
1069  * The multipliers reflect the number of clocks for the fastest rate so
1070  * one tick at 4xDDR is 8 ticks at 1xSDR.
1071  * If the destination port will take longer to receive a packet than
1072  * the outgoing link can send it, we need to delay sending the next packet
1073  * by the difference in time it takes the receiver to receive and the sender
1074  * to send this packet.
1075  * Note that this delay is always correct for UC and RC but not always
1076  * optimal for UD. For UD, the destination HCA can be different for each
1077  * packet, in which case, we could send packets to a different destination
1078  * while "waiting" for the delay. The overhead for doing this without
1079  * HW support is more than just paying the cost of delaying some packets
1080  * unnecessarily.
1081  */
1082 static inline unsigned ipath_pkt_delay(u32 plen, u8 snd_mult, u8 rcv_mult)
1083 {
1084         return (rcv_mult > snd_mult) ?
1085                 (plen * (rcv_mult - snd_mult) + 1) >> 1 : 0;
1086 }
1087
1088 static int ipath_verbs_send_dma(struct ipath_qp *qp,
1089                                 struct ipath_ib_header *hdr, u32 hdrwords,
1090                                 struct ipath_sge_state *ss, u32 len,
1091                                 u32 plen, u32 dwords)
1092 {
1093         struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
1094         struct ipath_devdata *dd = dev->dd;
1095         struct ipath_verbs_txreq *tx;
1096         u32 *piobuf;
1097         u32 control;
1098         u32 ndesc;
1099         int ret;
1100
1101         tx = qp->s_tx;
1102         if (tx) {
1103                 qp->s_tx = NULL;
1104                 /* resend previously constructed packet */
1105                 atomic_inc(&qp->s_dma_busy);
1106                 ret = ipath_sdma_verbs_send(dd, tx->ss, tx->len, tx);
1107                 if (ret) {
1108                         qp->s_tx = tx;
1109                         decrement_dma_busy(qp);
1110                 }
1111                 goto bail;
1112         }
1113
1114         tx = get_txreq(dev);
1115         if (!tx) {
1116                 ret = -EBUSY;
1117                 goto bail;
1118         }
1119
1120         /*
1121          * Get the saved delay count we computed for the previous packet
1122          * and save the delay count for this packet to be used next time
1123          * we get here.
1124          */
1125         control = qp->s_pkt_delay;
1126         qp->s_pkt_delay = ipath_pkt_delay(plen, dd->delay_mult, qp->s_dmult);
1127
1128         tx->qp = qp;
1129         atomic_inc(&qp->refcount);
1130         tx->wqe = qp->s_wqe;
1131         tx->txreq.callback = sdma_complete;
1132         tx->txreq.callback_cookie = tx;
1133         tx->txreq.flags = IPATH_SDMA_TXREQ_F_HEADTOHOST |
1134                 IPATH_SDMA_TXREQ_F_INTREQ | IPATH_SDMA_TXREQ_F_FREEDESC;
1135         if (plen + 1 >= IPATH_SMALLBUF_DWORDS)
1136                 tx->txreq.flags |= IPATH_SDMA_TXREQ_F_USELARGEBUF;
1137
1138         /* VL15 packets bypass credit check */
1139         if ((be16_to_cpu(hdr->lrh[0]) >> 12) == 15) {
1140                 control |= 1ULL << 31;
1141                 tx->txreq.flags |= IPATH_SDMA_TXREQ_F_VL15;
1142         }
1143
1144         if (len) {
1145                 /*
1146                  * Don't try to DMA if it takes more descriptors than
1147                  * the queue holds.
1148                  */
1149                 ndesc = ipath_count_sge(ss, len);
1150                 if (ndesc >= dd->ipath_sdma_descq_cnt)
1151                         ndesc = 0;
1152         } else
1153                 ndesc = 1;
1154         if (ndesc) {
1155                 tx->hdr.pbc[0] = cpu_to_le32(plen);
1156                 tx->hdr.pbc[1] = cpu_to_le32(control);
1157                 memcpy(&tx->hdr.hdr, hdr, hdrwords << 2);
1158                 tx->txreq.sg_count = ndesc;
1159                 tx->map_len = (hdrwords + 2) << 2;
1160                 tx->txreq.map_addr = &tx->hdr;
1161                 atomic_inc(&qp->s_dma_busy);
1162                 ret = ipath_sdma_verbs_send(dd, ss, dwords, tx);
1163                 if (ret) {
1164                         /* save ss and length in dwords */
1165                         tx->ss = ss;
1166                         tx->len = dwords;
1167                         qp->s_tx = tx;
1168                         decrement_dma_busy(qp);
1169                 }
1170                 goto bail;
1171         }
1172
1173         /* Allocate a buffer and copy the header and payload to it. */
1174         tx->map_len = (plen + 1) << 2;
1175         piobuf = kmalloc(tx->map_len, GFP_ATOMIC);
1176         if (unlikely(piobuf == NULL)) {
1177                 ret = -EBUSY;
1178                 goto err_tx;
1179         }
1180         tx->txreq.map_addr = piobuf;
1181         tx->txreq.flags |= IPATH_SDMA_TXREQ_F_FREEBUF;
1182         tx->txreq.sg_count = 1;
1183
1184         *piobuf++ = (__force u32) cpu_to_le32(plen);
1185         *piobuf++ = (__force u32) cpu_to_le32(control);
1186         memcpy(piobuf, hdr, hdrwords << 2);
1187         ipath_copy_from_sge(piobuf + hdrwords, ss, len);
1188
1189         atomic_inc(&qp->s_dma_busy);
1190         ret = ipath_sdma_verbs_send(dd, NULL, 0, tx);
1191         /*
1192          * If we couldn't queue the DMA request, save the info
1193          * and try again later rather than destroying the
1194          * buffer and undoing the side effects of the copy.
1195          */
1196         if (ret) {
1197                 tx->ss = NULL;
1198                 tx->len = 0;
1199                 qp->s_tx = tx;
1200                 decrement_dma_busy(qp);
1201         }
1202         dev->n_unaligned++;
1203         goto bail;
1204
1205 err_tx:
1206         if (atomic_dec_and_test(&qp->refcount))
1207                 wake_up(&qp->wait);
1208         put_txreq(dev, tx);
1209 bail:
1210         return ret;
1211 }
1212
1213 static int ipath_verbs_send_pio(struct ipath_qp *qp,
1214                                 struct ipath_ib_header *ibhdr, u32 hdrwords,
1215                                 struct ipath_sge_state *ss, u32 len,
1216                                 u32 plen, u32 dwords)
1217 {
1218         struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
1219         u32 *hdr = (u32 *) ibhdr;
1220         u32 __iomem *piobuf;
1221         unsigned flush_wc;
1222         u32 control;
1223         int ret;
1224         unsigned int flags;
1225
1226         piobuf = ipath_getpiobuf(dd, plen, NULL);
1227         if (unlikely(piobuf == NULL)) {
1228                 ret = -EBUSY;
1229                 goto bail;
1230         }
1231
1232         /*
1233          * Get the saved delay count we computed for the previous packet
1234          * and save the delay count for this packet to be used next time
1235          * we get here.
1236          */
1237         control = qp->s_pkt_delay;
1238         qp->s_pkt_delay = ipath_pkt_delay(plen, dd->delay_mult, qp->s_dmult);
1239
1240         /* VL15 packets bypass credit check */
1241         if ((be16_to_cpu(ibhdr->lrh[0]) >> 12) == 15)
1242                 control |= 1ULL << 31;
1243
1244         /*
1245          * Write the length to the control qword plus any needed flags.
1246          * We have to flush after the PBC for correctness on some cpus
1247          * or WC buffer can be written out of order.
1248          */
1249         writeq(((u64) control << 32) | plen, piobuf);
1250         piobuf += 2;
1251
1252         flush_wc = dd->ipath_flags & IPATH_PIO_FLUSH_WC;
1253         if (len == 0) {
1254                 /*
1255                  * If there is just the header portion, must flush before
1256                  * writing last word of header for correctness, and after
1257                  * the last header word (trigger word).
1258                  */
1259                 if (flush_wc) {
1260                         ipath_flush_wc();
1261                         __iowrite32_copy(piobuf, hdr, hdrwords - 1);
1262                         ipath_flush_wc();
1263                         __raw_writel(hdr[hdrwords - 1], piobuf + hdrwords - 1);
1264                         ipath_flush_wc();
1265                 } else
1266                         __iowrite32_copy(piobuf, hdr, hdrwords);
1267                 goto done;
1268         }
1269
1270         if (flush_wc)
1271                 ipath_flush_wc();
1272         __iowrite32_copy(piobuf, hdr, hdrwords);
1273         piobuf += hdrwords;
1274
1275         /* The common case is aligned and contained in one segment. */
1276         if (likely(ss->num_sge == 1 && len <= ss->sge.length &&
1277                    !((unsigned long)ss->sge.vaddr & (sizeof(u32) - 1)))) {
1278                 u32 *addr = (u32 *) ss->sge.vaddr;
1279
1280                 /* Update address before sending packet. */
1281                 update_sge(ss, len);
1282                 if (flush_wc) {
1283                         __iowrite32_copy(piobuf, addr, dwords - 1);
1284                         /* must flush early everything before trigger word */
1285                         ipath_flush_wc();
1286                         __raw_writel(addr[dwords - 1], piobuf + dwords - 1);
1287                         /* be sure trigger word is written */
1288                         ipath_flush_wc();
1289                 } else
1290                         __iowrite32_copy(piobuf, addr, dwords);
1291                 goto done;
1292         }
1293         copy_io(piobuf, ss, len, flush_wc);
1294 done:
1295         if (qp->s_wqe) {
1296                 spin_lock_irqsave(&qp->s_lock, flags);
1297                 ipath_send_complete(qp, qp->s_wqe, IB_WC_SUCCESS);
1298                 spin_unlock_irqrestore(&qp->s_lock, flags);
1299         }
1300         ret = 0;
1301 bail:
1302         return ret;
1303 }
1304
1305 /**
1306  * ipath_verbs_send - send a packet
1307  * @qp: the QP to send on
1308  * @hdr: the packet header
1309  * @hdrwords: the number of 32-bit words in the header
1310  * @ss: the SGE to send
1311  * @len: the length of the packet in bytes
1312  */
1313 int ipath_verbs_send(struct ipath_qp *qp, struct ipath_ib_header *hdr,
1314                      u32 hdrwords, struct ipath_sge_state *ss, u32 len)
1315 {
1316         struct ipath_devdata *dd = to_idev(qp->ibqp.device)->dd;
1317         u32 plen;
1318         int ret;
1319         u32 dwords = (len + 3) >> 2;
1320
1321         /*
1322          * Calculate the send buffer trigger address.
1323          * The +1 counts for the pbc control dword following the pbc length.
1324          */
1325         plen = hdrwords + dwords + 1;
1326
1327         /*
1328          * VL15 packets (IB_QPT_SMI) will always use PIO, so we
1329          * can defer SDMA restart until link goes ACTIVE without
1330          * worrying about just how we got there.
1331          */
1332         if (qp->ibqp.qp_type == IB_QPT_SMI ||
1333             !(dd->ipath_flags & IPATH_HAS_SEND_DMA))
1334                 ret = ipath_verbs_send_pio(qp, hdr, hdrwords, ss, len,
1335                                            plen, dwords);
1336         else
1337                 ret = ipath_verbs_send_dma(qp, hdr, hdrwords, ss, len,
1338                                            plen, dwords);
1339
1340         return ret;
1341 }
1342
1343 int ipath_snapshot_counters(struct ipath_devdata *dd, u64 *swords,
1344                             u64 *rwords, u64 *spkts, u64 *rpkts,
1345                             u64 *xmit_wait)
1346 {
1347         int ret;
1348
1349         if (!(dd->ipath_flags & IPATH_INITTED)) {
1350                 /* no hardware, freeze, etc. */
1351                 ret = -EINVAL;
1352                 goto bail;
1353         }
1354         *swords = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordsendcnt);
1355         *rwords = ipath_snap_cntr(dd, dd->ipath_cregs->cr_wordrcvcnt);
1356         *spkts = ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
1357         *rpkts = ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
1358         *xmit_wait = ipath_snap_cntr(dd, dd->ipath_cregs->cr_sendstallcnt);
1359
1360         ret = 0;
1361
1362 bail:
1363         return ret;
1364 }
1365
1366 /**
1367  * ipath_get_counters - get various chip counters
1368  * @dd: the infinipath device
1369  * @cntrs: counters are placed here
1370  *
1371  * Return the counters needed by recv_pma_get_portcounters().
1372  */
1373 int ipath_get_counters(struct ipath_devdata *dd,
1374                        struct ipath_verbs_counters *cntrs)
1375 {
1376         struct ipath_cregs const *crp = dd->ipath_cregs;
1377         int ret;
1378
1379         if (!(dd->ipath_flags & IPATH_INITTED)) {
1380                 /* no hardware, freeze, etc. */
1381                 ret = -EINVAL;
1382                 goto bail;
1383         }
1384         cntrs->symbol_error_counter =
1385                 ipath_snap_cntr(dd, crp->cr_ibsymbolerrcnt);
1386         cntrs->link_error_recovery_counter =
1387                 ipath_snap_cntr(dd, crp->cr_iblinkerrrecovcnt);
1388         /*
1389          * The link downed counter counts when the other side downs the
1390          * connection.  We add in the number of times we downed the link
1391          * due to local link integrity errors to compensate.
1392          */
1393         cntrs->link_downed_counter =
1394                 ipath_snap_cntr(dd, crp->cr_iblinkdowncnt);
1395         cntrs->port_rcv_errors =
1396                 ipath_snap_cntr(dd, crp->cr_rxdroppktcnt) +
1397                 ipath_snap_cntr(dd, crp->cr_rcvovflcnt) +
1398                 ipath_snap_cntr(dd, crp->cr_portovflcnt) +
1399                 ipath_snap_cntr(dd, crp->cr_err_rlencnt) +
1400                 ipath_snap_cntr(dd, crp->cr_invalidrlencnt) +
1401                 ipath_snap_cntr(dd, crp->cr_errlinkcnt) +
1402                 ipath_snap_cntr(dd, crp->cr_erricrccnt) +
1403                 ipath_snap_cntr(dd, crp->cr_errvcrccnt) +
1404                 ipath_snap_cntr(dd, crp->cr_errlpcrccnt) +
1405                 ipath_snap_cntr(dd, crp->cr_badformatcnt) +
1406                 dd->ipath_rxfc_unsupvl_errs;
1407         if (crp->cr_rxotherlocalphyerrcnt)
1408                 cntrs->port_rcv_errors +=
1409                         ipath_snap_cntr(dd, crp->cr_rxotherlocalphyerrcnt);
1410         if (crp->cr_rxvlerrcnt)
1411                 cntrs->port_rcv_errors +=
1412                         ipath_snap_cntr(dd, crp->cr_rxvlerrcnt);
1413         cntrs->port_rcv_remphys_errors =
1414                 ipath_snap_cntr(dd, crp->cr_rcvebpcnt);
1415         cntrs->port_xmit_discards = ipath_snap_cntr(dd, crp->cr_unsupvlcnt);
1416         cntrs->port_xmit_data = ipath_snap_cntr(dd, crp->cr_wordsendcnt);
1417         cntrs->port_rcv_data = ipath_snap_cntr(dd, crp->cr_wordrcvcnt);
1418         cntrs->port_xmit_packets = ipath_snap_cntr(dd, crp->cr_pktsendcnt);
1419         cntrs->port_rcv_packets = ipath_snap_cntr(dd, crp->cr_pktrcvcnt);
1420         cntrs->local_link_integrity_errors =
1421                 crp->cr_locallinkintegrityerrcnt ?
1422                 ipath_snap_cntr(dd, crp->cr_locallinkintegrityerrcnt) :
1423                 ((dd->ipath_flags & IPATH_GPIO_ERRINTRS) ?
1424                  dd->ipath_lli_errs : dd->ipath_lli_errors);
1425         cntrs->excessive_buffer_overrun_errors =
1426                 crp->cr_excessbufferovflcnt ?
1427                 ipath_snap_cntr(dd, crp->cr_excessbufferovflcnt) :
1428                 dd->ipath_overrun_thresh_errs;
1429         cntrs->vl15_dropped = crp->cr_vl15droppedpktcnt ?
1430                 ipath_snap_cntr(dd, crp->cr_vl15droppedpktcnt) : 0;
1431
1432         ret = 0;
1433
1434 bail:
1435         return ret;
1436 }
1437
1438 /**
1439  * ipath_ib_piobufavail - callback when a PIO buffer is available
1440  * @arg: the device pointer
1441  *
1442  * This is called from ipath_intr() at interrupt level when a PIO buffer is
1443  * available after ipath_verbs_send() returned an error that no buffers were
1444  * available.  Return 1 if we consumed all the PIO buffers and we still have
1445  * QPs waiting for buffers (for now, just restart the send tasklet and
1446  * return zero).
1447  */
1448 int ipath_ib_piobufavail(struct ipath_ibdev *dev)
1449 {
1450         struct list_head *list;
1451         struct ipath_qp *qplist;
1452         struct ipath_qp *qp;
1453         unsigned long flags;
1454
1455         if (dev == NULL)
1456                 goto bail;
1457
1458         list = &dev->piowait;
1459         qplist = NULL;
1460
1461         spin_lock_irqsave(&dev->pending_lock, flags);
1462         while (!list_empty(list)) {
1463                 qp = list_entry(list->next, struct ipath_qp, piowait);
1464                 list_del_init(&qp->piowait);
1465                 qp->pio_next = qplist;
1466                 qplist = qp;
1467                 atomic_inc(&qp->refcount);
1468         }
1469         spin_unlock_irqrestore(&dev->pending_lock, flags);
1470
1471         while (qplist != NULL) {
1472                 qp = qplist;
1473                 qplist = qp->pio_next;
1474
1475                 spin_lock_irqsave(&qp->s_lock, flags);
1476                 if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)
1477                         ipath_schedule_send(qp);
1478                 spin_unlock_irqrestore(&qp->s_lock, flags);
1479
1480                 /* Notify ipath_destroy_qp() if it is waiting. */
1481                 if (atomic_dec_and_test(&qp->refcount))
1482                         wake_up(&qp->wait);
1483         }
1484
1485 bail:
1486         return 0;
1487 }
1488
1489 static int ipath_query_device(struct ib_device *ibdev,
1490                               struct ib_device_attr *props)
1491 {
1492         struct ipath_ibdev *dev = to_idev(ibdev);
1493
1494         memset(props, 0, sizeof(*props));
1495
1496         props->device_cap_flags = IB_DEVICE_BAD_PKEY_CNTR |
1497                 IB_DEVICE_BAD_QKEY_CNTR | IB_DEVICE_SHUTDOWN_PORT |
1498                 IB_DEVICE_SYS_IMAGE_GUID | IB_DEVICE_RC_RNR_NAK_GEN |
1499                 IB_DEVICE_PORT_ACTIVE_EVENT | IB_DEVICE_SRQ_RESIZE;
1500         props->page_size_cap = PAGE_SIZE;
1501         props->vendor_id =
1502                 IPATH_SRC_OUI_1 << 16 | IPATH_SRC_OUI_2 << 8 | IPATH_SRC_OUI_3;
1503         props->vendor_part_id = dev->dd->ipath_deviceid;
1504         props->hw_ver = dev->dd->ipath_pcirev;
1505
1506         props->sys_image_guid = dev->sys_image_guid;
1507
1508         props->max_mr_size = ~0ull;
1509         props->max_qp = ib_ipath_max_qps;
1510         props->max_qp_wr = ib_ipath_max_qp_wrs;
1511         props->max_sge = ib_ipath_max_sges;
1512         props->max_cq = ib_ipath_max_cqs;
1513         props->max_ah = ib_ipath_max_ahs;
1514         props->max_cqe = ib_ipath_max_cqes;
1515         props->max_mr = dev->lk_table.max;
1516         props->max_fmr = dev->lk_table.max;
1517         props->max_map_per_fmr = 32767;
1518         props->max_pd = ib_ipath_max_pds;
1519         props->max_qp_rd_atom = IPATH_MAX_RDMA_ATOMIC;
1520         props->max_qp_init_rd_atom = 255;
1521         /* props->max_res_rd_atom */
1522         props->max_srq = ib_ipath_max_srqs;
1523         props->max_srq_wr = ib_ipath_max_srq_wrs;
1524         props->max_srq_sge = ib_ipath_max_srq_sges;
1525         /* props->local_ca_ack_delay */
1526         props->atomic_cap = IB_ATOMIC_GLOB;
1527         props->max_pkeys = ipath_get_npkeys(dev->dd);
1528         props->max_mcast_grp = ib_ipath_max_mcast_grps;
1529         props->max_mcast_qp_attach = ib_ipath_max_mcast_qp_attached;
1530         props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
1531                 props->max_mcast_grp;
1532
1533         return 0;
1534 }
1535
1536 const u8 ipath_cvt_physportstate[32] = {
1537         [INFINIPATH_IBCS_LT_STATE_DISABLED] = IB_PHYSPORTSTATE_DISABLED,
1538         [INFINIPATH_IBCS_LT_STATE_LINKUP] = IB_PHYSPORTSTATE_LINKUP,
1539         [INFINIPATH_IBCS_LT_STATE_POLLACTIVE] = IB_PHYSPORTSTATE_POLL,
1540         [INFINIPATH_IBCS_LT_STATE_POLLQUIET] = IB_PHYSPORTSTATE_POLL,
1541         [INFINIPATH_IBCS_LT_STATE_SLEEPDELAY] = IB_PHYSPORTSTATE_SLEEP,
1542         [INFINIPATH_IBCS_LT_STATE_SLEEPQUIET] = IB_PHYSPORTSTATE_SLEEP,
1543         [INFINIPATH_IBCS_LT_STATE_CFGDEBOUNCE] =
1544                 IB_PHYSPORTSTATE_CFG_TRAIN,
1545         [INFINIPATH_IBCS_LT_STATE_CFGRCVFCFG] =
1546                 IB_PHYSPORTSTATE_CFG_TRAIN,
1547         [INFINIPATH_IBCS_LT_STATE_CFGWAITRMT] =
1548                 IB_PHYSPORTSTATE_CFG_TRAIN,
1549         [INFINIPATH_IBCS_LT_STATE_CFGIDLE] = IB_PHYSPORTSTATE_CFG_TRAIN,
1550         [INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN] =
1551                 IB_PHYSPORTSTATE_LINK_ERR_RECOVER,
1552         [INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT] =
1553                 IB_PHYSPORTSTATE_LINK_ERR_RECOVER,
1554         [INFINIPATH_IBCS_LT_STATE_RECOVERIDLE] =
1555                 IB_PHYSPORTSTATE_LINK_ERR_RECOVER,
1556         [0x10] = IB_PHYSPORTSTATE_CFG_TRAIN,
1557         [0x11] = IB_PHYSPORTSTATE_CFG_TRAIN,
1558         [0x12] = IB_PHYSPORTSTATE_CFG_TRAIN,
1559         [0x13] = IB_PHYSPORTSTATE_CFG_TRAIN,
1560         [0x14] = IB_PHYSPORTSTATE_CFG_TRAIN,
1561         [0x15] = IB_PHYSPORTSTATE_CFG_TRAIN,
1562         [0x16] = IB_PHYSPORTSTATE_CFG_TRAIN,
1563         [0x17] = IB_PHYSPORTSTATE_CFG_TRAIN
1564 };
1565
1566 u32 ipath_get_cr_errpkey(struct ipath_devdata *dd)
1567 {
1568         return ipath_read_creg32(dd, dd->ipath_cregs->cr_errpkey);
1569 }
1570
1571 static int ipath_query_port(struct ib_device *ibdev,
1572                             u8 port, struct ib_port_attr *props)
1573 {
1574         struct ipath_ibdev *dev = to_idev(ibdev);
1575         struct ipath_devdata *dd = dev->dd;
1576         enum ib_mtu mtu;
1577         u16 lid = dd->ipath_lid;
1578         u64 ibcstat;
1579
1580         memset(props, 0, sizeof(*props));
1581         props->lid = lid ? lid : __constant_be16_to_cpu(IB_LID_PERMISSIVE);
1582         props->lmc = dd->ipath_lmc;
1583         props->sm_lid = dev->sm_lid;
1584         props->sm_sl = dev->sm_sl;
1585         ibcstat = dd->ipath_lastibcstat;
1586         /* map LinkState to IB portinfo values.  */
1587         props->state = ipath_ib_linkstate(dd, ibcstat) + 1;
1588
1589         /* See phys_state_show() */
1590         props->phys_state = /* MEA: assumes shift == 0 */
1591                 ipath_cvt_physportstate[dd->ipath_lastibcstat &
1592                 dd->ibcs_lts_mask];
1593         props->port_cap_flags = dev->port_cap_flags;
1594         props->gid_tbl_len = 1;
1595         props->max_msg_sz = 0x80000000;
1596         props->pkey_tbl_len = ipath_get_npkeys(dd);
1597         props->bad_pkey_cntr = ipath_get_cr_errpkey(dd) -
1598                 dev->z_pkey_violations;
1599         props->qkey_viol_cntr = dev->qkey_violations;
1600         props->active_width = dd->ipath_link_width_active;
1601         /* See rate_show() */
1602         props->active_speed = dd->ipath_link_speed_active;
1603         props->max_vl_num = 1;          /* VLCap = VL0 */
1604         props->init_type_reply = 0;
1605
1606         props->max_mtu = ipath_mtu4096 ? IB_MTU_4096 : IB_MTU_2048;
1607         switch (dd->ipath_ibmtu) {
1608         case 4096:
1609                 mtu = IB_MTU_4096;
1610                 break;
1611         case 2048:
1612                 mtu = IB_MTU_2048;
1613                 break;
1614         case 1024:
1615                 mtu = IB_MTU_1024;
1616                 break;
1617         case 512:
1618                 mtu = IB_MTU_512;
1619                 break;
1620         case 256:
1621                 mtu = IB_MTU_256;
1622                 break;
1623         default:
1624                 mtu = IB_MTU_2048;
1625         }
1626         props->active_mtu = mtu;
1627         props->subnet_timeout = dev->subnet_timeout;
1628
1629         return 0;
1630 }
1631
1632 static int ipath_modify_device(struct ib_device *device,
1633                                int device_modify_mask,
1634                                struct ib_device_modify *device_modify)
1635 {
1636         int ret;
1637
1638         if (device_modify_mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
1639                                    IB_DEVICE_MODIFY_NODE_DESC)) {
1640                 ret = -EOPNOTSUPP;
1641                 goto bail;
1642         }
1643
1644         if (device_modify_mask & IB_DEVICE_MODIFY_NODE_DESC)
1645                 memcpy(device->node_desc, device_modify->node_desc, 64);
1646
1647         if (device_modify_mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID)
1648                 to_idev(device)->sys_image_guid =
1649                         cpu_to_be64(device_modify->sys_image_guid);
1650
1651         ret = 0;
1652
1653 bail:
1654         return ret;
1655 }
1656
1657 static int ipath_modify_port(struct ib_device *ibdev,
1658                              u8 port, int port_modify_mask,
1659                              struct ib_port_modify *props)
1660 {
1661         struct ipath_ibdev *dev = to_idev(ibdev);
1662
1663         dev->port_cap_flags |= props->set_port_cap_mask;
1664         dev->port_cap_flags &= ~props->clr_port_cap_mask;
1665         if (port_modify_mask & IB_PORT_SHUTDOWN)
1666                 ipath_set_linkstate(dev->dd, IPATH_IB_LINKDOWN);
1667         if (port_modify_mask & IB_PORT_RESET_QKEY_CNTR)
1668                 dev->qkey_violations = 0;
1669         return 0;
1670 }
1671
1672 static int ipath_query_gid(struct ib_device *ibdev, u8 port,
1673                            int index, union ib_gid *gid)
1674 {
1675         struct ipath_ibdev *dev = to_idev(ibdev);
1676         int ret;
1677
1678         if (index >= 1) {
1679                 ret = -EINVAL;
1680                 goto bail;
1681         }
1682         gid->global.subnet_prefix = dev->gid_prefix;
1683         gid->global.interface_id = dev->dd->ipath_guid;
1684
1685         ret = 0;
1686
1687 bail:
1688         return ret;
1689 }
1690
1691 static struct ib_pd *ipath_alloc_pd(struct ib_device *ibdev,
1692                                     struct ib_ucontext *context,
1693                                     struct ib_udata *udata)
1694 {
1695         struct ipath_ibdev *dev = to_idev(ibdev);
1696         struct ipath_pd *pd;
1697         struct ib_pd *ret;
1698
1699         /*
1700          * This is actually totally arbitrary.  Some correctness tests
1701          * assume there's a maximum number of PDs that can be allocated.
1702          * We don't actually have this limit, but we fail the test if
1703          * we allow allocations of more than we report for this value.
1704          */
1705
1706         pd = kmalloc(sizeof *pd, GFP_KERNEL);
1707         if (!pd) {
1708                 ret = ERR_PTR(-ENOMEM);
1709                 goto bail;
1710         }
1711
1712         spin_lock(&dev->n_pds_lock);
1713         if (dev->n_pds_allocated == ib_ipath_max_pds) {
1714                 spin_unlock(&dev->n_pds_lock);
1715                 kfree(pd);
1716                 ret = ERR_PTR(-ENOMEM);
1717                 goto bail;
1718         }
1719
1720         dev->n_pds_allocated++;
1721         spin_unlock(&dev->n_pds_lock);
1722
1723         /* ib_alloc_pd() will initialize pd->ibpd. */
1724         pd->user = udata != NULL;
1725
1726         ret = &pd->ibpd;
1727
1728 bail:
1729         return ret;
1730 }
1731
1732 static int ipath_dealloc_pd(struct ib_pd *ibpd)
1733 {
1734         struct ipath_pd *pd = to_ipd(ibpd);
1735         struct ipath_ibdev *dev = to_idev(ibpd->device);
1736
1737         spin_lock(&dev->n_pds_lock);
1738         dev->n_pds_allocated--;
1739         spin_unlock(&dev->n_pds_lock);
1740
1741         kfree(pd);
1742
1743         return 0;
1744 }
1745
1746 /**
1747  * ipath_create_ah - create an address handle
1748  * @pd: the protection domain
1749  * @ah_attr: the attributes of the AH
1750  *
1751  * This may be called from interrupt context.
1752  */
1753 static struct ib_ah *ipath_create_ah(struct ib_pd *pd,
1754                                      struct ib_ah_attr *ah_attr)
1755 {
1756         struct ipath_ah *ah;
1757         struct ib_ah *ret;
1758         struct ipath_ibdev *dev = to_idev(pd->device);
1759         unsigned long flags;
1760
1761         /* A multicast address requires a GRH (see ch. 8.4.1). */
1762         if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
1763             ah_attr->dlid != IPATH_PERMISSIVE_LID &&
1764             !(ah_attr->ah_flags & IB_AH_GRH)) {
1765                 ret = ERR_PTR(-EINVAL);
1766                 goto bail;
1767         }
1768
1769         if (ah_attr->dlid == 0) {
1770                 ret = ERR_PTR(-EINVAL);
1771                 goto bail;
1772         }
1773
1774         if (ah_attr->port_num < 1 ||
1775             ah_attr->port_num > pd->device->phys_port_cnt) {
1776                 ret = ERR_PTR(-EINVAL);
1777                 goto bail;
1778         }
1779
1780         ah = kmalloc(sizeof *ah, GFP_ATOMIC);
1781         if (!ah) {
1782                 ret = ERR_PTR(-ENOMEM);
1783                 goto bail;
1784         }
1785
1786         spin_lock_irqsave(&dev->n_ahs_lock, flags);
1787         if (dev->n_ahs_allocated == ib_ipath_max_ahs) {
1788                 spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1789                 kfree(ah);
1790                 ret = ERR_PTR(-ENOMEM);
1791                 goto bail;
1792         }
1793
1794         dev->n_ahs_allocated++;
1795         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1796
1797         /* ib_create_ah() will initialize ah->ibah. */
1798         ah->attr = *ah_attr;
1799         ah->attr.static_rate = ipath_ib_rate_to_mult(ah_attr->static_rate);
1800
1801         ret = &ah->ibah;
1802
1803 bail:
1804         return ret;
1805 }
1806
1807 /**
1808  * ipath_destroy_ah - destroy an address handle
1809  * @ibah: the AH to destroy
1810  *
1811  * This may be called from interrupt context.
1812  */
1813 static int ipath_destroy_ah(struct ib_ah *ibah)
1814 {
1815         struct ipath_ibdev *dev = to_idev(ibah->device);
1816         struct ipath_ah *ah = to_iah(ibah);
1817         unsigned long flags;
1818
1819         spin_lock_irqsave(&dev->n_ahs_lock, flags);
1820         dev->n_ahs_allocated--;
1821         spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
1822
1823         kfree(ah);
1824
1825         return 0;
1826 }
1827
1828 static int ipath_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
1829 {
1830         struct ipath_ah *ah = to_iah(ibah);
1831
1832         *ah_attr = ah->attr;
1833         ah_attr->static_rate = ipath_mult_to_ib_rate(ah->attr.static_rate);
1834
1835         return 0;
1836 }
1837
1838 /**
1839  * ipath_get_npkeys - return the size of the PKEY table for port 0
1840  * @dd: the infinipath device
1841  */
1842 unsigned ipath_get_npkeys(struct ipath_devdata *dd)
1843 {
1844         return ARRAY_SIZE(dd->ipath_pd[0]->port_pkeys);
1845 }
1846
1847 /**
1848  * ipath_get_pkey - return the indexed PKEY from the port 0 PKEY table
1849  * @dd: the infinipath device
1850  * @index: the PKEY index
1851  */
1852 unsigned ipath_get_pkey(struct ipath_devdata *dd, unsigned index)
1853 {
1854         unsigned ret;
1855
1856         if (index >= ARRAY_SIZE(dd->ipath_pd[0]->port_pkeys))
1857                 ret = 0;
1858         else
1859                 ret = dd->ipath_pd[0]->port_pkeys[index];
1860
1861         return ret;
1862 }
1863
1864 static int ipath_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
1865                             u16 *pkey)
1866 {
1867         struct ipath_ibdev *dev = to_idev(ibdev);
1868         int ret;
1869
1870         if (index >= ipath_get_npkeys(dev->dd)) {
1871                 ret = -EINVAL;
1872                 goto bail;
1873         }
1874
1875         *pkey = ipath_get_pkey(dev->dd, index);
1876         ret = 0;
1877
1878 bail:
1879         return ret;
1880 }
1881
1882 /**
1883  * ipath_alloc_ucontext - allocate a ucontest
1884  * @ibdev: the infiniband device
1885  * @udata: not used by the InfiniPath driver
1886  */
1887
1888 static struct ib_ucontext *ipath_alloc_ucontext(struct ib_device *ibdev,
1889                                                 struct ib_udata *udata)
1890 {
1891         struct ipath_ucontext *context;
1892         struct ib_ucontext *ret;
1893
1894         context = kmalloc(sizeof *context, GFP_KERNEL);
1895         if (!context) {
1896                 ret = ERR_PTR(-ENOMEM);
1897                 goto bail;
1898         }
1899
1900         ret = &context->ibucontext;
1901
1902 bail:
1903         return ret;
1904 }
1905
1906 static int ipath_dealloc_ucontext(struct ib_ucontext *context)
1907 {
1908         kfree(to_iucontext(context));
1909         return 0;
1910 }
1911
1912 static int ipath_verbs_register_sysfs(struct ib_device *dev);
1913
1914 static void __verbs_timer(unsigned long arg)
1915 {
1916         struct ipath_devdata *dd = (struct ipath_devdata *) arg;
1917
1918         /* Handle verbs layer timeouts. */
1919         ipath_ib_timer(dd->verbs_dev);
1920
1921         mod_timer(&dd->verbs_timer, jiffies + 1);
1922 }
1923
1924 static int enable_timer(struct ipath_devdata *dd)
1925 {
1926         /*
1927          * Early chips had a design flaw where the chip and kernel idea
1928          * of the tail register don't always agree, and therefore we won't
1929          * get an interrupt on the next packet received.
1930          * If the board supports per packet receive interrupts, use it.
1931          * Otherwise, the timer function periodically checks for packets
1932          * to cover this case.
1933          * Either way, the timer is needed for verbs layer related
1934          * processing.
1935          */
1936         if (dd->ipath_flags & IPATH_GPIO_INTR) {
1937                 ipath_write_kreg(dd, dd->ipath_kregs->kr_debugportselect,
1938                                  0x2074076542310ULL);
1939                 /* Enable GPIO bit 2 interrupt */
1940                 dd->ipath_gpio_mask |= (u64) (1 << IPATH_GPIO_PORT0_BIT);
1941                 ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_mask,
1942                                  dd->ipath_gpio_mask);
1943         }
1944
1945         init_timer(&dd->verbs_timer);
1946         dd->verbs_timer.function = __verbs_timer;
1947         dd->verbs_timer.data = (unsigned long)dd;
1948         dd->verbs_timer.expires = jiffies + 1;
1949         add_timer(&dd->verbs_timer);
1950
1951         return 0;
1952 }
1953
1954 static int disable_timer(struct ipath_devdata *dd)
1955 {
1956         /* Disable GPIO bit 2 interrupt */
1957         if (dd->ipath_flags & IPATH_GPIO_INTR) {
1958                 /* Disable GPIO bit 2 interrupt */
1959                 dd->ipath_gpio_mask &= ~((u64) (1 << IPATH_GPIO_PORT0_BIT));
1960                 ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_mask,
1961                                  dd->ipath_gpio_mask);
1962                 /*
1963                  * We might want to undo changes to debugportselect,
1964                  * but how?
1965                  */
1966         }
1967
1968         del_timer_sync(&dd->verbs_timer);
1969
1970         return 0;
1971 }
1972
1973 /**
1974  * ipath_register_ib_device - register our device with the infiniband core
1975  * @dd: the device data structure
1976  * Return the allocated ipath_ibdev pointer or NULL on error.
1977  */
1978 int ipath_register_ib_device(struct ipath_devdata *dd)
1979 {
1980         struct ipath_verbs_counters cntrs;
1981         struct ipath_ibdev *idev;
1982         struct ib_device *dev;
1983         struct ipath_verbs_txreq *tx;
1984         unsigned i;
1985         int ret;
1986
1987         idev = (struct ipath_ibdev *)ib_alloc_device(sizeof *idev);
1988         if (idev == NULL) {
1989                 ret = -ENOMEM;
1990                 goto bail;
1991         }
1992
1993         dev = &idev->ibdev;
1994
1995         if (dd->ipath_sdma_descq_cnt) {
1996                 tx = kmalloc(dd->ipath_sdma_descq_cnt * sizeof *tx,
1997                              GFP_KERNEL);
1998                 if (tx == NULL) {
1999                         ret = -ENOMEM;
2000                         goto err_tx;
2001                 }
2002         } else
2003                 tx = NULL;
2004         idev->txreq_bufs = tx;
2005
2006         /* Only need to initialize non-zero fields. */
2007         spin_lock_init(&idev->n_pds_lock);
2008         spin_lock_init(&idev->n_ahs_lock);
2009         spin_lock_init(&idev->n_cqs_lock);
2010         spin_lock_init(&idev->n_qps_lock);
2011         spin_lock_init(&idev->n_srqs_lock);
2012         spin_lock_init(&idev->n_mcast_grps_lock);
2013
2014         spin_lock_init(&idev->qp_table.lock);
2015         spin_lock_init(&idev->lk_table.lock);
2016         idev->sm_lid = __constant_be16_to_cpu(IB_LID_PERMISSIVE);
2017         /* Set the prefix to the default value (see ch. 4.1.1) */
2018         idev->gid_prefix = __constant_cpu_to_be64(0xfe80000000000000ULL);
2019
2020         ret = ipath_init_qp_table(idev, ib_ipath_qp_table_size);
2021         if (ret)
2022                 goto err_qp;
2023
2024         /*
2025          * The top ib_ipath_lkey_table_size bits are used to index the
2026          * table.  The lower 8 bits can be owned by the user (copied from
2027          * the LKEY).  The remaining bits act as a generation number or tag.
2028          */
2029         idev->lk_table.max = 1 << ib_ipath_lkey_table_size;
2030         idev->lk_table.table = kzalloc(idev->lk_table.max *
2031                                        sizeof(*idev->lk_table.table),
2032                                        GFP_KERNEL);
2033         if (idev->lk_table.table == NULL) {
2034                 ret = -ENOMEM;
2035                 goto err_lk;
2036         }
2037         INIT_LIST_HEAD(&idev->pending_mmaps);
2038         spin_lock_init(&idev->pending_lock);
2039         idev->mmap_offset = PAGE_SIZE;
2040         spin_lock_init(&idev->mmap_offset_lock);
2041         INIT_LIST_HEAD(&idev->pending[0]);
2042         INIT_LIST_HEAD(&idev->pending[1]);
2043         INIT_LIST_HEAD(&idev->pending[2]);
2044         INIT_LIST_HEAD(&idev->piowait);
2045         INIT_LIST_HEAD(&idev->rnrwait);
2046         INIT_LIST_HEAD(&idev->txreq_free);
2047         idev->pending_index = 0;
2048         idev->port_cap_flags =
2049                 IB_PORT_SYS_IMAGE_GUID_SUP | IB_PORT_CLIENT_REG_SUP;
2050         if (dd->ipath_flags & IPATH_HAS_LINK_LATENCY)
2051                 idev->port_cap_flags |= IB_PORT_LINK_LATENCY_SUP;
2052         idev->pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
2053         idev->pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
2054         idev->pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
2055         idev->pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
2056         idev->pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;
2057
2058         /* Snapshot current HW counters to "clear" them. */
2059         ipath_get_counters(dd, &cntrs);
2060         idev->z_symbol_error_counter = cntrs.symbol_error_counter;
2061         idev->z_link_error_recovery_counter =
2062                 cntrs.link_error_recovery_counter;
2063         idev->z_link_downed_counter = cntrs.link_downed_counter;
2064         idev->z_port_rcv_errors = cntrs.port_rcv_errors;
2065         idev->z_port_rcv_remphys_errors =
2066                 cntrs.port_rcv_remphys_errors;
2067         idev->z_port_xmit_discards = cntrs.port_xmit_discards;
2068         idev->z_port_xmit_data = cntrs.port_xmit_data;
2069         idev->z_port_rcv_data = cntrs.port_rcv_data;
2070         idev->z_port_xmit_packets = cntrs.port_xmit_packets;
2071         idev->z_port_rcv_packets = cntrs.port_rcv_packets;
2072         idev->z_local_link_integrity_errors =
2073                 cntrs.local_link_integrity_errors;
2074         idev->z_excessive_buffer_overrun_errors =
2075                 cntrs.excessive_buffer_overrun_errors;
2076         idev->z_vl15_dropped = cntrs.vl15_dropped;
2077
2078         for (i = 0; i < dd->ipath_sdma_descq_cnt; i++, tx++)
2079                 list_add(&tx->txreq.list, &idev->txreq_free);
2080
2081         /*
2082          * The system image GUID is supposed to be the same for all
2083          * IB HCAs in a single system but since there can be other
2084          * device types in the system, we can't be sure this is unique.
2085          */
2086         if (!sys_image_guid)
2087                 sys_image_guid = dd->ipath_guid;
2088         idev->sys_image_guid = sys_image_guid;
2089         idev->ib_unit = dd->ipath_unit;
2090         idev->dd = dd;
2091
2092         strlcpy(dev->name, "ipath%d", IB_DEVICE_NAME_MAX);
2093         dev->owner = THIS_MODULE;
2094         dev->node_guid = dd->ipath_guid;
2095         dev->uverbs_abi_ver = IPATH_UVERBS_ABI_VERSION;
2096         dev->uverbs_cmd_mask =
2097                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT)         |
2098                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE)        |
2099                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT)          |
2100                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD)            |
2101                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD)          |
2102                 (1ull << IB_USER_VERBS_CMD_CREATE_AH)           |
2103                 (1ull << IB_USER_VERBS_CMD_DESTROY_AH)          |
2104                 (1ull << IB_USER_VERBS_CMD_QUERY_AH)            |
2105                 (1ull << IB_USER_VERBS_CMD_REG_MR)              |
2106                 (1ull << IB_USER_VERBS_CMD_DEREG_MR)            |
2107                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
2108                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ)           |
2109                 (1ull << IB_USER_VERBS_CMD_RESIZE_CQ)           |
2110                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ)          |
2111                 (1ull << IB_USER_VERBS_CMD_POLL_CQ)             |
2112                 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ)       |
2113                 (1ull << IB_USER_VERBS_CMD_CREATE_QP)           |
2114                 (1ull << IB_USER_VERBS_CMD_QUERY_QP)            |
2115                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP)           |
2116                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP)          |
2117                 (1ull << IB_USER_VERBS_CMD_POST_SEND)           |
2118                 (1ull << IB_USER_VERBS_CMD_POST_RECV)           |
2119                 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST)        |
2120                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST)        |
2121                 (1ull << IB_USER_VERBS_CMD_CREATE_SRQ)          |
2122                 (1ull << IB_USER_VERBS_CMD_MODIFY_SRQ)          |
2123                 (1ull << IB_USER_VERBS_CMD_QUERY_SRQ)           |
2124                 (1ull << IB_USER_VERBS_CMD_DESTROY_SRQ)         |
2125                 (1ull << IB_USER_VERBS_CMD_POST_SRQ_RECV);
2126         dev->node_type = RDMA_NODE_IB_CA;
2127         dev->phys_port_cnt = 1;
2128         dev->num_comp_vectors = 1;
2129         dev->dma_device = &dd->pcidev->dev;
2130         dev->query_device = ipath_query_device;
2131         dev->modify_device = ipath_modify_device;
2132         dev->query_port = ipath_query_port;
2133         dev->modify_port = ipath_modify_port;
2134         dev->query_pkey = ipath_query_pkey;
2135         dev->query_gid = ipath_query_gid;
2136         dev->alloc_ucontext = ipath_alloc_ucontext;
2137         dev->dealloc_ucontext = ipath_dealloc_ucontext;
2138         dev->alloc_pd = ipath_alloc_pd;
2139         dev->dealloc_pd = ipath_dealloc_pd;
2140         dev->create_ah = ipath_create_ah;
2141         dev->destroy_ah = ipath_destroy_ah;
2142         dev->query_ah = ipath_query_ah;
2143         dev->create_srq = ipath_create_srq;
2144         dev->modify_srq = ipath_modify_srq;
2145         dev->query_srq = ipath_query_srq;
2146         dev->destroy_srq = ipath_destroy_srq;
2147         dev->create_qp = ipath_create_qp;
2148         dev->modify_qp = ipath_modify_qp;
2149         dev->query_qp = ipath_query_qp;
2150         dev->destroy_qp = ipath_destroy_qp;
2151         dev->post_send = ipath_post_send;
2152         dev->post_recv = ipath_post_receive;
2153         dev->post_srq_recv = ipath_post_srq_receive;
2154         dev->create_cq = ipath_create_cq;
2155         dev->destroy_cq = ipath_destroy_cq;
2156         dev->resize_cq = ipath_resize_cq;
2157         dev->poll_cq = ipath_poll_cq;
2158         dev->req_notify_cq = ipath_req_notify_cq;
2159         dev->get_dma_mr = ipath_get_dma_mr;
2160         dev->reg_phys_mr = ipath_reg_phys_mr;
2161         dev->reg_user_mr = ipath_reg_user_mr;
2162         dev->dereg_mr = ipath_dereg_mr;
2163         dev->alloc_fmr = ipath_alloc_fmr;
2164         dev->map_phys_fmr = ipath_map_phys_fmr;
2165         dev->unmap_fmr = ipath_unmap_fmr;
2166         dev->dealloc_fmr = ipath_dealloc_fmr;
2167         dev->attach_mcast = ipath_multicast_attach;
2168         dev->detach_mcast = ipath_multicast_detach;
2169         dev->process_mad = ipath_process_mad;
2170         dev->mmap = ipath_mmap;
2171         dev->dma_ops = &ipath_dma_mapping_ops;
2172
2173         snprintf(dev->node_desc, sizeof(dev->node_desc),
2174                  IPATH_IDSTR " %s", init_utsname()->nodename);
2175
2176         ret = ib_register_device(dev);
2177         if (ret)
2178                 goto err_reg;
2179
2180         if (ipath_verbs_register_sysfs(dev))
2181                 goto err_class;
2182
2183         enable_timer(dd);
2184
2185         goto bail;
2186
2187 err_class:
2188         ib_unregister_device(dev);
2189 err_reg:
2190         kfree(idev->lk_table.table);
2191 err_lk:
2192         kfree(idev->qp_table.table);
2193 err_qp:
2194         kfree(idev->txreq_bufs);
2195 err_tx:
2196         ib_dealloc_device(dev);
2197         ipath_dev_err(dd, "cannot register verbs: %d!\n", -ret);
2198         idev = NULL;
2199
2200 bail:
2201         dd->verbs_dev = idev;
2202         return ret;
2203 }
2204
2205 void ipath_unregister_ib_device(struct ipath_ibdev *dev)
2206 {
2207         struct ib_device *ibdev = &dev->ibdev;
2208         u32 qps_inuse;
2209
2210         ib_unregister_device(ibdev);
2211
2212         disable_timer(dev->dd);
2213
2214         if (!list_empty(&dev->pending[0]) ||
2215             !list_empty(&dev->pending[1]) ||
2216             !list_empty(&dev->pending[2]))
2217                 ipath_dev_err(dev->dd, "pending list not empty!\n");
2218         if (!list_empty(&dev->piowait))
2219                 ipath_dev_err(dev->dd, "piowait list not empty!\n");
2220         if (!list_empty(&dev->rnrwait))
2221                 ipath_dev_err(dev->dd, "rnrwait list not empty!\n");
2222         if (!ipath_mcast_tree_empty())
2223                 ipath_dev_err(dev->dd, "multicast table memory leak!\n");
2224         /*
2225          * Note that ipath_unregister_ib_device() can be called before all
2226          * the QPs are destroyed!
2227          */
2228         qps_inuse = ipath_free_all_qps(&dev->qp_table);
2229         if (qps_inuse)
2230                 ipath_dev_err(dev->dd, "QP memory leak! %u still in use\n",
2231                         qps_inuse);
2232         kfree(dev->qp_table.table);
2233         kfree(dev->lk_table.table);
2234         kfree(dev->txreq_bufs);
2235         ib_dealloc_device(ibdev);
2236 }
2237
2238 static ssize_t show_rev(struct device *device, struct device_attribute *attr,
2239                         char *buf)
2240 {
2241         struct ipath_ibdev *dev =
2242                 container_of(device, struct ipath_ibdev, ibdev.dev);
2243
2244         return sprintf(buf, "%x\n", dev->dd->ipath_pcirev);
2245 }
2246
2247 static ssize_t show_hca(struct device *device, struct device_attribute *attr,
2248                         char *buf)
2249 {
2250         struct ipath_ibdev *dev =
2251                 container_of(device, struct ipath_ibdev, ibdev.dev);
2252         int ret;
2253
2254         ret = dev->dd->ipath_f_get_boardname(dev->dd, buf, 128);
2255         if (ret < 0)
2256                 goto bail;
2257         strcat(buf, "\n");
2258         ret = strlen(buf);
2259
2260 bail:
2261         return ret;
2262 }
2263
2264 static ssize_t show_stats(struct device *device, struct device_attribute *attr,
2265                           char *buf)
2266 {
2267         struct ipath_ibdev *dev =
2268                 container_of(device, struct ipath_ibdev, ibdev.dev);
2269         int i;
2270         int len;
2271
2272         len = sprintf(buf,
2273                       "RC resends  %d\n"
2274                       "RC no QACK  %d\n"
2275                       "RC ACKs     %d\n"
2276                       "RC SEQ NAKs %d\n"
2277                       "RC RDMA seq %d\n"
2278                       "RC RNR NAKs %d\n"
2279                       "RC OTH NAKs %d\n"
2280                       "RC timeouts %d\n"
2281                       "RC RDMA dup %d\n"
2282                       "piobuf wait %d\n"
2283                       "unaligned   %d\n"
2284                       "PKT drops   %d\n"
2285                       "WQE errs    %d\n",
2286                       dev->n_rc_resends, dev->n_rc_qacks, dev->n_rc_acks,
2287                       dev->n_seq_naks, dev->n_rdma_seq, dev->n_rnr_naks,
2288                       dev->n_other_naks, dev->n_timeouts,
2289                       dev->n_rdma_dup_busy, dev->n_piowait, dev->n_unaligned,
2290                       dev->n_pkt_drops, dev->n_wqe_errs);
2291         for (i = 0; i < ARRAY_SIZE(dev->opstats); i++) {
2292                 const struct ipath_opcode_stats *si = &dev->opstats[i];
2293
2294                 if (!si->n_packets && !si->n_bytes)
2295                         continue;
2296                 len += sprintf(buf + len, "%02x %llu/%llu\n", i,
2297                                (unsigned long long) si->n_packets,
2298                                (unsigned long long) si->n_bytes);
2299         }
2300         return len;
2301 }
2302
2303 static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
2304 static DEVICE_ATTR(hca_type, S_IRUGO, show_hca, NULL);
2305 static DEVICE_ATTR(board_id, S_IRUGO, show_hca, NULL);
2306 static DEVICE_ATTR(stats, S_IRUGO, show_stats, NULL);
2307
2308 static struct device_attribute *ipath_class_attributes[] = {
2309         &dev_attr_hw_rev,
2310         &dev_attr_hca_type,
2311         &dev_attr_board_id,
2312         &dev_attr_stats
2313 };
2314
2315 static int ipath_verbs_register_sysfs(struct ib_device *dev)
2316 {
2317         int i;
2318         int ret;
2319
2320         for (i = 0; i < ARRAY_SIZE(ipath_class_attributes); ++i)
2321                 if (device_create_file(&dev->dev,
2322                                        ipath_class_attributes[i])) {
2323                         ret = 1;
2324                         goto bail;
2325                 }
2326
2327         ret = 0;
2328
2329 bail:
2330         return ret;
2331 }