drivers/infiniband/hw/mthca/mthca_qp.c

   1 /*
   2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Cisco Systems. All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/string.h>
  37 #include <linux/slab.h>
  38 #include <linux/sched.h>
  39
  40 #include <asm/io.h>
  41
  42 #include <rdma/ib_verbs.h>
  43 #include <rdma/ib_cache.h>
  44 #include <rdma/ib_pack.h>
  45 #include <rdma/uverbs_ioctl.h>
  46
  47 #include "mthca_dev.h"
  48 #include "mthca_cmd.h"
  49 #include "mthca_memfree.h"
  50 #include "mthca_wqe.h"
  51
  52 enum {
  53         MTHCA_MAX_DIRECT_QP_SIZE = 4 * PAGE_SIZE,
  54         MTHCA_ACK_REQ_FREQ       = 10,
  55         MTHCA_FLIGHT_LIMIT       = 9,
  56         MTHCA_UD_HEADER_SIZE     = 72, /* largest UD header possible */
  57         MTHCA_INLINE_HEADER_SIZE = 4,  /* data segment overhead for inline */
  58         MTHCA_INLINE_CHUNK_SIZE  = 16  /* inline data segment chunk */
  59 };
  60
  61 enum {
  62         MTHCA_QP_STATE_RST  = 0,
  63         MTHCA_QP_STATE_INIT = 1,
  64         MTHCA_QP_STATE_RTR  = 2,
  65         MTHCA_QP_STATE_RTS  = 3,
  66         MTHCA_QP_STATE_SQE  = 4,
  67         MTHCA_QP_STATE_SQD  = 5,
  68         MTHCA_QP_STATE_ERR  = 6,
  69         MTHCA_QP_STATE_DRAINING = 7
  70 };
  71
  72 enum {
  73         MTHCA_QP_ST_RC  = 0x0,
  74         MTHCA_QP_ST_UC  = 0x1,
  75         MTHCA_QP_ST_RD  = 0x2,
  76         MTHCA_QP_ST_UD  = 0x3,
  77         MTHCA_QP_ST_MLX = 0x7
  78 };
  79
  80 enum {
  81         MTHCA_QP_PM_MIGRATED = 0x3,
  82         MTHCA_QP_PM_ARMED    = 0x0,
  83         MTHCA_QP_PM_REARM    = 0x1
  84 };
  85
  86 enum {
  87         /* qp_context flags */
  88         MTHCA_QP_BIT_DE  = 1 <<  8,
  89         /* params1 */
  90         MTHCA_QP_BIT_SRE = 1 << 15,
  91         MTHCA_QP_BIT_SWE = 1 << 14,
  92         MTHCA_QP_BIT_SAE = 1 << 13,
  93         MTHCA_QP_BIT_SIC = 1 <<  4,
  94         MTHCA_QP_BIT_SSC = 1 <<  3,
  95         /* params2 */
  96         MTHCA_QP_BIT_RRE = 1 << 15,
  97         MTHCA_QP_BIT_RWE = 1 << 14,
  98         MTHCA_QP_BIT_RAE = 1 << 13,
  99         MTHCA_QP_BIT_RIC = 1 <<  4,
 100         MTHCA_QP_BIT_RSC = 1 <<  3
 101 };
 102
 103 enum {
 104         MTHCA_SEND_DOORBELL_FENCE = 1 << 5
 105 };
 106
 107 struct mthca_qp_path {
 108         __be32 port_pkey;
 109         u8     rnr_retry;
 110         u8     g_mylmc;
 111         __be16 rlid;
 112         u8     ackto;
 113         u8     mgid_index;
 114         u8     static_rate;
 115         u8     hop_limit;
 116         __be32 sl_tclass_flowlabel;
 117         u8     rgid[16];
 118 } __packed;
 119
 120 struct mthca_qp_context {
 121         __be32 flags;
 122         __be32 tavor_sched_queue; /* Reserved on Arbel */
 123         u8     mtu_msgmax;
 124         u8     rq_size_stride;  /* Reserved on Tavor */
 125         u8     sq_size_stride;  /* Reserved on Tavor */
 126         u8     rlkey_arbel_sched_queue; /* Reserved on Tavor */
 127         __be32 usr_page;
 128         __be32 local_qpn;
 129         __be32 remote_qpn;
 130         u32    reserved1[2];
 131         struct mthca_qp_path pri_path;
 132         struct mthca_qp_path alt_path;
 133         __be32 rdd;
 134         __be32 pd;
 135         __be32 wqe_base;
 136         __be32 wqe_lkey;
 137         __be32 params1;
 138         __be32 reserved2;
 139         __be32 next_send_psn;
 140         __be32 cqn_snd;
 141         __be32 snd_wqe_base_l;  /* Next send WQE on Tavor */
 142         __be32 snd_db_index;    /* (debugging only entries) */
 143         __be32 last_acked_psn;
 144         __be32 ssn;
 145         __be32 params2;
 146         __be32 rnr_nextrecvpsn;
 147         __be32 ra_buff_indx;
 148         __be32 cqn_rcv;
 149         __be32 rcv_wqe_base_l;  /* Next recv WQE on Tavor */
 150         __be32 rcv_db_index;    /* (debugging only entries) */
 151         __be32 qkey;
 152         __be32 srqn;
 153         __be32 rmsn;
 154         __be16 rq_wqe_counter;  /* reserved on Tavor */
 155         __be16 sq_wqe_counter;  /* reserved on Tavor */
 156         u32    reserved3[18];
 157 } __packed;
 158
 159 struct mthca_qp_param {
 160         __be32 opt_param_mask;
 161         u32    reserved1;
 162         struct mthca_qp_context context;
 163         u32    reserved2[62];
 164 } __packed;
 165
 166 enum {
 167         MTHCA_QP_OPTPAR_ALT_ADDR_PATH     = 1 << 0,
 168         MTHCA_QP_OPTPAR_RRE               = 1 << 1,
 169         MTHCA_QP_OPTPAR_RAE               = 1 << 2,
 170         MTHCA_QP_OPTPAR_RWE               = 1 << 3,
 171         MTHCA_QP_OPTPAR_PKEY_INDEX        = 1 << 4,
 172         MTHCA_QP_OPTPAR_Q_KEY             = 1 << 5,
 173         MTHCA_QP_OPTPAR_RNR_TIMEOUT       = 1 << 6,
 174         MTHCA_QP_OPTPAR_PRIMARY_ADDR_PATH = 1 << 7,
 175         MTHCA_QP_OPTPAR_SRA_MAX           = 1 << 8,
 176         MTHCA_QP_OPTPAR_RRA_MAX           = 1 << 9,
 177         MTHCA_QP_OPTPAR_PM_STATE          = 1 << 10,
 178         MTHCA_QP_OPTPAR_PORT_NUM          = 1 << 11,
 179         MTHCA_QP_OPTPAR_RETRY_COUNT       = 1 << 12,
 180         MTHCA_QP_OPTPAR_ALT_RNR_RETRY     = 1 << 13,
 181         MTHCA_QP_OPTPAR_ACK_TIMEOUT       = 1 << 14,
 182         MTHCA_QP_OPTPAR_RNR_RETRY         = 1 << 15,
 183         MTHCA_QP_OPTPAR_SCHED_QUEUE       = 1 << 16
 184 };
 185
 186 static const u8 mthca_opcode[] = {
 187         [IB_WR_SEND]                 = MTHCA_OPCODE_SEND,
 188         [IB_WR_SEND_WITH_IMM]        = MTHCA_OPCODE_SEND_IMM,
 189         [IB_WR_RDMA_WRITE]           = MTHCA_OPCODE_RDMA_WRITE,
 190         [IB_WR_RDMA_WRITE_WITH_IMM]  = MTHCA_OPCODE_RDMA_WRITE_IMM,
 191         [IB_WR_RDMA_READ]            = MTHCA_OPCODE_RDMA_READ,
 192         [IB_WR_ATOMIC_CMP_AND_SWP]   = MTHCA_OPCODE_ATOMIC_CS,
 193         [IB_WR_ATOMIC_FETCH_AND_ADD] = MTHCA_OPCODE_ATOMIC_FA,
 194 };
 195
 196 static int is_sqp(struct mthca_dev *dev, struct mthca_qp *qp)
 197 {
 198         return qp->qpn >= dev->qp_table.sqp_start &&
 199                 qp->qpn <= dev->qp_table.sqp_start + 3;
 200 }
 201
 202 static int is_qp0(struct mthca_dev *dev, struct mthca_qp *qp)
 203 {
 204         return qp->qpn >= dev->qp_table.sqp_start &&
 205                 qp->qpn <= dev->qp_table.sqp_start + 1;
 206 }
 207
 208 static void *get_recv_wqe(struct mthca_qp *qp, int n)
 209 {
 210         if (qp->is_direct)
 211                 return qp->queue.direct.buf + (n << qp->rq.wqe_shift);
 212         else
 213                 return qp->queue.page_list[(n << qp->rq.wqe_shift) >> PAGE_SHIFT].buf +
 214                         ((n << qp->rq.wqe_shift) & (PAGE_SIZE - 1));
 215 }
 216
 217 static void *get_send_wqe(struct mthca_qp *qp, int n)
 218 {
 219         if (qp->is_direct)
 220                 return qp->queue.direct.buf + qp->send_wqe_offset +
 221                         (n << qp->sq.wqe_shift);
 222         else
 223                 return qp->queue.page_list[(qp->send_wqe_offset +
 224                                             (n << qp->sq.wqe_shift)) >>
 225                                            PAGE_SHIFT].buf +
 226                         ((qp->send_wqe_offset + (n << qp->sq.wqe_shift)) &
 227                          (PAGE_SIZE - 1));
 228 }
 229
 230 static void mthca_wq_reset(struct mthca_wq *wq)
 231 {
 232         wq->next_ind  = 0;
 233         wq->last_comp = wq->max - 1;
 234         wq->head      = 0;
 235         wq->tail      = 0;
 236 }
 237
 238 void mthca_qp_event(struct mthca_dev *dev, u32 qpn,
 239                     enum ib_event_type event_type)
 240 {
 241         struct mthca_qp *qp;
 242         struct ib_event event;
 243
 244         spin_lock(&dev->qp_table.lock);
 245         qp = mthca_array_get(&dev->qp_table.qp, qpn & (dev->limits.num_qps - 1));
 246         if (qp)
 247                 ++qp->refcount;
 248         spin_unlock(&dev->qp_table.lock);
 249
 250         if (!qp) {
 251                 mthca_warn(dev, "Async event %d for bogus QP %08x\n",
 252                            event_type, qpn);
 253                 return;
 254         }
 255
 256         if (event_type == IB_EVENT_PATH_MIG)
 257                 qp->port = qp->alt_port;
 258
 259         event.device      = &dev->ib_dev;
 260         event.event       = event_type;
 261         event.element.qp  = &qp->ibqp;
 262         if (qp->ibqp.event_handler)
 263                 qp->ibqp.event_handler(&event, qp->ibqp.qp_context);
 264
 265         spin_lock(&dev->qp_table.lock);
 266         if (!--qp->refcount)
 267                 wake_up(&qp->wait);
 268         spin_unlock(&dev->qp_table.lock);
 269 }
 270
 271 static int to_mthca_state(enum ib_qp_state ib_state)
 272 {
 273         switch (ib_state) {
 274         case IB_QPS_RESET: return MTHCA_QP_STATE_RST;
 275         case IB_QPS_INIT:  return MTHCA_QP_STATE_INIT;
 276         case IB_QPS_RTR:   return MTHCA_QP_STATE_RTR;
 277         case IB_QPS_RTS:   return MTHCA_QP_STATE_RTS;
 278         case IB_QPS_SQD:   return MTHCA_QP_STATE_SQD;
 279         case IB_QPS_SQE:   return MTHCA_QP_STATE_SQE;
 280         case IB_QPS_ERR:   return MTHCA_QP_STATE_ERR;
 281         default:                return -1;
 282         }
 283 }
 284
 285 enum { RC, UC, UD, RD, RDEE, MLX, NUM_TRANS };
 286
 287 static int to_mthca_st(int transport)
 288 {
 289         switch (transport) {
 290         case RC:  return MTHCA_QP_ST_RC;
 291         case UC:  return MTHCA_QP_ST_UC;
 292         case UD:  return MTHCA_QP_ST_UD;
 293         case RD:  return MTHCA_QP_ST_RD;
 294         case MLX: return MTHCA_QP_ST_MLX;
 295         default:  return -1;
 296         }
 297 }
 298
 299 static void store_attrs(struct mthca_sqp *sqp, const struct ib_qp_attr *attr,
 300                         int attr_mask)
 301 {
 302         if (attr_mask & IB_QP_PKEY_INDEX)
 303                 sqp->pkey_index = attr->pkey_index;
 304         if (attr_mask & IB_QP_QKEY)
 305                 sqp->qkey = attr->qkey;
 306         if (attr_mask & IB_QP_SQ_PSN)
 307                 sqp->send_psn = attr->sq_psn;
 308 }
 309
 310 static void init_port(struct mthca_dev *dev, int port)
 311 {
 312         int err;
 313         struct mthca_init_ib_param param;
 314
 315         memset(&param, 0, sizeof param);
 316
 317         param.port_width = dev->limits.port_width_cap;
 318         param.vl_cap     = dev->limits.vl_cap;
 319         param.mtu_cap    = dev->limits.mtu_cap;
 320         param.gid_cap    = dev->limits.gid_table_len;
 321         param.pkey_cap   = dev->limits.pkey_table_len;
 322
 323         err = mthca_INIT_IB(dev, &param, port);
 324         if (err)
 325                 mthca_warn(dev, "INIT_IB failed, return code %d.\n", err);
 326 }
 327
 328 static __be32 get_hw_access_flags(struct mthca_qp *qp, const struct ib_qp_attr *attr,
 329                                   int attr_mask)
 330 {
 331         u8 dest_rd_atomic;
 332         u32 access_flags;
 333         u32 hw_access_flags = 0;
 334
 335         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 336                 dest_rd_atomic = attr->max_dest_rd_atomic;
 337         else
 338                 dest_rd_atomic = qp->resp_depth;
 339
 340         if (attr_mask & IB_QP_ACCESS_FLAGS)
 341                 access_flags = attr->qp_access_flags;
 342         else
 343                 access_flags = qp->atomic_rd_en;
 344
 345         if (!dest_rd_atomic)
 346                 access_flags &= IB_ACCESS_REMOTE_WRITE;
 347
 348         if (access_flags & IB_ACCESS_REMOTE_READ)
 349                 hw_access_flags |= MTHCA_QP_BIT_RRE;
 350         if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
 351                 hw_access_flags |= MTHCA_QP_BIT_RAE;
 352         if (access_flags & IB_ACCESS_REMOTE_WRITE)
 353                 hw_access_flags |= MTHCA_QP_BIT_RWE;
 354
 355         return cpu_to_be32(hw_access_flags);
 356 }
 357
 358 static inline enum ib_qp_state to_ib_qp_state(int mthca_state)
 359 {
 360         switch (mthca_state) {
 361         case MTHCA_QP_STATE_RST:      return IB_QPS_RESET;
 362         case MTHCA_QP_STATE_INIT:     return IB_QPS_INIT;
 363         case MTHCA_QP_STATE_RTR:      return IB_QPS_RTR;
 364         case MTHCA_QP_STATE_RTS:      return IB_QPS_RTS;
 365         case MTHCA_QP_STATE_DRAINING:
 366         case MTHCA_QP_STATE_SQD:      return IB_QPS_SQD;
 367         case MTHCA_QP_STATE_SQE:      return IB_QPS_SQE;
 368         case MTHCA_QP_STATE_ERR:      return IB_QPS_ERR;
 369         default:                      return -1;
 370         }
 371 }
 372
 373 static inline enum ib_mig_state to_ib_mig_state(int mthca_mig_state)
 374 {
 375         switch (mthca_mig_state) {
 376         case 0:  return IB_MIG_ARMED;
 377         case 1:  return IB_MIG_REARM;
 378         case 3:  return IB_MIG_MIGRATED;
 379         default: return -1;
 380         }
 381 }
 382
 383 static int to_ib_qp_access_flags(int mthca_flags)
 384 {
 385         int ib_flags = 0;
 386
 387         if (mthca_flags & MTHCA_QP_BIT_RRE)
 388                 ib_flags |= IB_ACCESS_REMOTE_READ;
 389         if (mthca_flags & MTHCA_QP_BIT_RWE)
 390                 ib_flags |= IB_ACCESS_REMOTE_WRITE;
 391         if (mthca_flags & MTHCA_QP_BIT_RAE)
 392                 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
 393
 394         return ib_flags;
 395 }
 396
 397 static void to_rdma_ah_attr(struct mthca_dev *dev,
 398                             struct rdma_ah_attr *ah_attr,
 399                             struct mthca_qp_path *path)
 400 {
 401         u8 port_num = (be32_to_cpu(path->port_pkey) >> 24) & 0x3;
 402
 403         memset(ah_attr, 0, sizeof(*ah_attr));
 404
 405         if (port_num == 0 || port_num > dev->limits.num_ports)
 406                 return;
 407         ah_attr->type = rdma_ah_find_type(&dev->ib_dev, port_num);
 408         rdma_ah_set_port_num(ah_attr, port_num);
 409
 410         rdma_ah_set_dlid(ah_attr, be16_to_cpu(path->rlid));
 411         rdma_ah_set_sl(ah_attr, be32_to_cpu(path->sl_tclass_flowlabel) >> 28);
 412         rdma_ah_set_path_bits(ah_attr, path->g_mylmc & 0x7f);
 413         rdma_ah_set_static_rate(ah_attr,
 414                                 mthca_rate_to_ib(dev,
 415                                                  path->static_rate & 0xf,
 416                                                  port_num));
 417         if (path->g_mylmc & (1 << 7)) {
 418                 u32 tc_fl = be32_to_cpu(path->sl_tclass_flowlabel);
 419
 420                 rdma_ah_set_grh(ah_attr, NULL,
 421                                 tc_fl & 0xfffff,
 422                                 path->mgid_index &
 423                                 (dev->limits.gid_table_len - 1),
 424                                 path->hop_limit,
 425                                 (tc_fl >> 20) & 0xff);
 426                 rdma_ah_set_dgid_raw(ah_attr, path->rgid);
 427         }
 428 }
 429
 430 int mthca_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
 431                    struct ib_qp_init_attr *qp_init_attr)
 432 {
 433         struct mthca_dev *dev = to_mdev(ibqp->device);
 434         struct mthca_qp *qp = to_mqp(ibqp);
 435         int err = 0;
 436         struct mthca_mailbox *mailbox = NULL;
 437         struct mthca_qp_param *qp_param;
 438         struct mthca_qp_context *context;
 439         int mthca_state;
 440
 441         mutex_lock(&qp->mutex);
 442
 443         if (qp->state == IB_QPS_RESET) {
 444                 qp_attr->qp_state = IB_QPS_RESET;
 445                 goto done;
 446         }
 447
 448         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 449         if (IS_ERR(mailbox)) {
 450                 err = PTR_ERR(mailbox);
 451                 goto out;
 452         }
 453
 454         err = mthca_QUERY_QP(dev, qp->qpn, 0, mailbox);
 455         if (err) {
 456                 mthca_warn(dev, "QUERY_QP failed (%d)\n", err);
 457                 goto out_mailbox;
 458         }
 459
 460         qp_param    = mailbox->buf;
 461         context     = &qp_param->context;
 462         mthca_state = be32_to_cpu(context->flags) >> 28;
 463
 464         qp->state                    = to_ib_qp_state(mthca_state);
 465         qp_attr->qp_state            = qp->state;
 466         qp_attr->path_mtu            = context->mtu_msgmax >> 5;
 467         qp_attr->path_mig_state      =
 468                 to_ib_mig_state((be32_to_cpu(context->flags) >> 11) & 0x3);
 469         qp_attr->qkey                = be32_to_cpu(context->qkey);
 470         qp_attr->rq_psn              = be32_to_cpu(context->rnr_nextrecvpsn) & 0xffffff;
 471         qp_attr->sq_psn              = be32_to_cpu(context->next_send_psn) & 0xffffff;
 472         qp_attr->dest_qp_num         = be32_to_cpu(context->remote_qpn) & 0xffffff;
 473         qp_attr->qp_access_flags     =
 474                 to_ib_qp_access_flags(be32_to_cpu(context->params2));
 475
 476         if (qp->transport == RC || qp->transport == UC) {
 477                 to_rdma_ah_attr(dev, &qp_attr->ah_attr, &context->pri_path);
 478                 to_rdma_ah_attr(dev, &qp_attr->alt_ah_attr, &context->alt_path);
 479                 qp_attr->alt_pkey_index =
 480                         be32_to_cpu(context->alt_path.port_pkey) & 0x7f;
 481                 qp_attr->alt_port_num   =
 482                         rdma_ah_get_port_num(&qp_attr->alt_ah_attr);
 483         }
 484
 485         qp_attr->pkey_index = be32_to_cpu(context->pri_path.port_pkey) & 0x7f;
 486         qp_attr->port_num   =
 487                 (be32_to_cpu(context->pri_path.port_pkey) >> 24) & 0x3;
 488
 489         /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
 490         qp_attr->sq_draining = mthca_state == MTHCA_QP_STATE_DRAINING;
 491
 492         qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context->params1) >> 21) & 0x7);
 493
 494         qp_attr->max_dest_rd_atomic =
 495                 1 << ((be32_to_cpu(context->params2) >> 21) & 0x7);
 496         qp_attr->min_rnr_timer      =
 497                 (be32_to_cpu(context->rnr_nextrecvpsn) >> 24) & 0x1f;
 498         qp_attr->timeout            = context->pri_path.ackto >> 3;
 499         qp_attr->retry_cnt          = (be32_to_cpu(context->params1) >> 16) & 0x7;
 500         qp_attr->rnr_retry          = context->pri_path.rnr_retry >> 5;
 501         qp_attr->alt_timeout        = context->alt_path.ackto >> 3;
 502
 503 done:
 504         qp_attr->cur_qp_state        = qp_attr->qp_state;
 505         qp_attr->cap.max_send_wr     = qp->sq.max;
 506         qp_attr->cap.max_recv_wr     = qp->rq.max;
 507         qp_attr->cap.max_send_sge    = qp->sq.max_gs;
 508         qp_attr->cap.max_recv_sge    = qp->rq.max_gs;
 509         qp_attr->cap.max_inline_data = qp->max_inline_data;
 510
 511         qp_init_attr->cap            = qp_attr->cap;
 512         qp_init_attr->sq_sig_type    = qp->sq_policy;
 513
 514 out_mailbox:
 515         mthca_free_mailbox(dev, mailbox);
 516
 517 out:
 518         mutex_unlock(&qp->mutex);
 519         return err;
 520 }
 521
 522 static int mthca_path_set(struct mthca_dev *dev, const struct rdma_ah_attr *ah,
 523                           struct mthca_qp_path *path, u8 port)
 524 {
 525         path->g_mylmc     = rdma_ah_get_path_bits(ah) & 0x7f;
 526         path->rlid        = cpu_to_be16(rdma_ah_get_dlid(ah));
 527         path->static_rate = mthca_get_rate(dev, rdma_ah_get_static_rate(ah),
 528                                            port);
 529
 530         if (rdma_ah_get_ah_flags(ah) & IB_AH_GRH) {
 531                 const struct ib_global_route *grh = rdma_ah_read_grh(ah);
 532
 533                 if (grh->sgid_index >= dev->limits.gid_table_len) {
 534                         mthca_dbg(dev, "sgid_index (%u) too large. max is %d\n",
 535                                   grh->sgid_index,
 536                                   dev->limits.gid_table_len - 1);
 537                         return -1;
 538                 }
 539
 540                 path->g_mylmc   |= 1 << 7;
 541                 path->mgid_index = grh->sgid_index;
 542                 path->hop_limit  = grh->hop_limit;
 543                 path->sl_tclass_flowlabel =
 544                         cpu_to_be32((rdma_ah_get_sl(ah) << 28) |
 545                                     (grh->traffic_class << 20) |
 546                                     (grh->flow_label));
 547                 memcpy(path->rgid, grh->dgid.raw, 16);
 548         } else {
 549                 path->sl_tclass_flowlabel = cpu_to_be32(rdma_ah_get_sl(ah) <<
 550                                                         28);
 551         }
 552
 553         return 0;
 554 }
 555
 556 static int __mthca_modify_qp(struct ib_qp *ibqp,
 557                              const struct ib_qp_attr *attr, int attr_mask,
 558                              enum ib_qp_state cur_state,
 559                              enum ib_qp_state new_state,
 560                              struct ib_udata *udata)
 561 {
 562         struct mthca_dev *dev = to_mdev(ibqp->device);
 563         struct mthca_qp *qp = to_mqp(ibqp);
 564         struct mthca_ucontext *context = rdma_udata_to_drv_context(
 565                 udata, struct mthca_ucontext, ibucontext);
 566         struct mthca_mailbox *mailbox;
 567         struct mthca_qp_param *qp_param;
 568         struct mthca_qp_context *qp_context;
 569         u32 sqd_event = 0;
 570         int err = -EINVAL;
 571
 572         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 573         if (IS_ERR(mailbox)) {
 574                 err = PTR_ERR(mailbox);
 575                 goto out;
 576         }
 577         qp_param = mailbox->buf;
 578         qp_context = &qp_param->context;
 579         memset(qp_param, 0, sizeof *qp_param);
 580
 581         qp_context->flags      = cpu_to_be32((to_mthca_state(new_state) << 28) |
 582                                              (to_mthca_st(qp->transport) << 16));
 583         qp_context->flags     |= cpu_to_be32(MTHCA_QP_BIT_DE);
 584         if (!(attr_mask & IB_QP_PATH_MIG_STATE))
 585                 qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_MIGRATED << 11);
 586         else {
 587                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PM_STATE);
 588                 switch (attr->path_mig_state) {
 589                 case IB_MIG_MIGRATED:
 590                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_MIGRATED << 11);
 591                         break;
 592                 case IB_MIG_REARM:
 593                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_REARM << 11);
 594                         break;
 595                 case IB_MIG_ARMED:
 596                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_ARMED << 11);
 597                         break;
 598                 }
 599         }
 600
 601         /* leave tavor_sched_queue as 0 */
 602
 603         if (qp->transport == MLX || qp->transport == UD)
 604                 qp_context->mtu_msgmax = (IB_MTU_2048 << 5) | 11;
 605         else if (attr_mask & IB_QP_PATH_MTU) {
 606                 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_2048) {
 607                         mthca_dbg(dev, "path MTU (%u) is invalid\n",
 608                                   attr->path_mtu);
 609                         goto out_mailbox;
 610                 }
 611                 qp_context->mtu_msgmax = (attr->path_mtu << 5) | 31;
 612         }
 613
 614         if (mthca_is_memfree(dev)) {
 615                 if (qp->rq.max)
 616                         qp_context->rq_size_stride = ilog2(qp->rq.max) << 3;
 617                 qp_context->rq_size_stride |= qp->rq.wqe_shift - 4;
 618
 619                 if (qp->sq.max)
 620                         qp_context->sq_size_stride = ilog2(qp->sq.max) << 3;
 621                 qp_context->sq_size_stride |= qp->sq.wqe_shift - 4;
 622         }
 623
 624         /* leave arbel_sched_queue as 0 */
 625
 626         if (qp->ibqp.uobject)
 627                 qp_context->usr_page = cpu_to_be32(context->uar.index);
 628         else
 629                 qp_context->usr_page = cpu_to_be32(dev->driver_uar.index);
 630         qp_context->local_qpn  = cpu_to_be32(qp->qpn);
 631         if (attr_mask & IB_QP_DEST_QPN) {
 632                 qp_context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
 633         }
 634
 635         if (qp->transport == MLX)
 636                 qp_context->pri_path.port_pkey |=
 637                         cpu_to_be32(qp->port << 24);
 638         else {
 639                 if (attr_mask & IB_QP_PORT) {
 640                         qp_context->pri_path.port_pkey |=
 641                                 cpu_to_be32(attr->port_num << 24);
 642                         qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PORT_NUM);
 643                 }
 644         }
 645
 646         if (attr_mask & IB_QP_PKEY_INDEX) {
 647                 qp_context->pri_path.port_pkey |=
 648                         cpu_to_be32(attr->pkey_index);
 649                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PKEY_INDEX);
 650         }
 651
 652         if (attr_mask & IB_QP_RNR_RETRY) {
 653                 qp_context->alt_path.rnr_retry = qp_context->pri_path.rnr_retry =
 654                         attr->rnr_retry << 5;
 655                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RNR_RETRY |
 656                                                         MTHCA_QP_OPTPAR_ALT_RNR_RETRY);
 657         }
 658
 659         if (attr_mask & IB_QP_AV) {
 660                 if (mthca_path_set(dev, &attr->ah_attr, &qp_context->pri_path,
 661                                    attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
 662                         goto out_mailbox;
 663
 664                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PRIMARY_ADDR_PATH);
 665         }
 666
 667         if (ibqp->qp_type == IB_QPT_RC &&
 668             cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) {
 669                 u8 sched_queue = ibqp->uobject ? 0x2 : 0x1;
 670
 671                 if (mthca_is_memfree(dev))
 672                         qp_context->rlkey_arbel_sched_queue |= sched_queue;
 673                 else
 674                         qp_context->tavor_sched_queue |= cpu_to_be32(sched_queue);
 675
 676                 qp_param->opt_param_mask |=
 677                         cpu_to_be32(MTHCA_QP_OPTPAR_SCHED_QUEUE);
 678         }
 679
 680         if (attr_mask & IB_QP_TIMEOUT) {
 681                 qp_context->pri_path.ackto = attr->timeout << 3;
 682                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_ACK_TIMEOUT);
 683         }
 684
 685         if (attr_mask & IB_QP_ALT_PATH) {
 686                 if (attr->alt_pkey_index >= dev->limits.pkey_table_len) {
 687                         mthca_dbg(dev, "Alternate P_Key index (%u) too large. max is %d\n",
 688                                   attr->alt_pkey_index, dev->limits.pkey_table_len-1);
 689                         goto out_mailbox;
 690                 }
 691
 692                 if (attr->alt_port_num == 0 || attr->alt_port_num > dev->limits.num_ports) {
 693                         mthca_dbg(dev, "Alternate port number (%u) is invalid\n",
 694                                 attr->alt_port_num);
 695                         goto out_mailbox;
 696                 }
 697
 698                 if (mthca_path_set(dev, &attr->alt_ah_attr, &qp_context->alt_path,
 699                                    rdma_ah_get_port_num(&attr->alt_ah_attr)))
 700                         goto out_mailbox;
 701
 702                 qp_context->alt_path.port_pkey |= cpu_to_be32(attr->alt_pkey_index |
 703                                                               attr->alt_port_num << 24);
 704                 qp_context->alt_path.ackto = attr->alt_timeout << 3;
 705                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_ALT_ADDR_PATH);
 706         }
 707
 708         /* leave rdd as 0 */
 709         qp_context->pd         = cpu_to_be32(to_mpd(ibqp->pd)->pd_num);
 710         /* leave wqe_base as 0 (we always create an MR based at 0 for WQs) */
 711         qp_context->wqe_lkey   = cpu_to_be32(qp->mr.ibmr.lkey);
 712         qp_context->params1    = cpu_to_be32((MTHCA_ACK_REQ_FREQ << 28) |
 713                                              (MTHCA_FLIGHT_LIMIT << 24) |
 714                                              MTHCA_QP_BIT_SWE);
 715         if (qp->sq_policy == IB_SIGNAL_ALL_WR)
 716                 qp_context->params1 |= cpu_to_be32(MTHCA_QP_BIT_SSC);
 717         if (attr_mask & IB_QP_RETRY_CNT) {
 718                 qp_context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
 719                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RETRY_COUNT);
 720         }
 721
 722         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
 723                 if (attr->max_rd_atomic) {
 724                         qp_context->params1 |=
 725                                 cpu_to_be32(MTHCA_QP_BIT_SRE |
 726                                             MTHCA_QP_BIT_SAE);
 727                         qp_context->params1 |=
 728                                 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
 729                 }
 730                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_SRA_MAX);
 731         }
 732
 733         if (attr_mask & IB_QP_SQ_PSN)
 734                 qp_context->next_send_psn = cpu_to_be32(attr->sq_psn);
 735         qp_context->cqn_snd = cpu_to_be32(to_mcq(ibqp->send_cq)->cqn);
 736
 737         if (mthca_is_memfree(dev)) {
 738                 qp_context->snd_wqe_base_l = cpu_to_be32(qp->send_wqe_offset);
 739                 qp_context->snd_db_index   = cpu_to_be32(qp->sq.db_index);
 740         }
 741
 742         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
 743                 if (attr->max_dest_rd_atomic)
 744                         qp_context->params2 |=
 745                                 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
 746
 747                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RRA_MAX);
 748         }
 749
 750         if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
 751                 qp_context->params2      |= get_hw_access_flags(qp, attr, attr_mask);
 752                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RWE |
 753                                                         MTHCA_QP_OPTPAR_RRE |
 754                                                         MTHCA_QP_OPTPAR_RAE);
 755         }
 756
 757         qp_context->params2 |= cpu_to_be32(MTHCA_QP_BIT_RSC);
 758
 759         if (ibqp->srq)
 760                 qp_context->params2 |= cpu_to_be32(MTHCA_QP_BIT_RIC);
 761
 762         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 763                 qp_context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
 764                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RNR_TIMEOUT);
 765         }
 766         if (attr_mask & IB_QP_RQ_PSN)
 767                 qp_context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
 768
 769         qp_context->ra_buff_indx =
 770                 cpu_to_be32(dev->qp_table.rdb_base +
 771                             ((qp->qpn & (dev->limits.num_qps - 1)) * MTHCA_RDB_ENTRY_SIZE <<
 772                              dev->qp_table.rdb_shift));
 773
 774         qp_context->cqn_rcv = cpu_to_be32(to_mcq(ibqp->recv_cq)->cqn);
 775
 776         if (mthca_is_memfree(dev))
 777                 qp_context->rcv_db_index   = cpu_to_be32(qp->rq.db_index);
 778
 779         if (attr_mask & IB_QP_QKEY) {
 780                 qp_context->qkey = cpu_to_be32(attr->qkey);
 781                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_Q_KEY);
 782         }
 783
 784         if (ibqp->srq)
 785                 qp_context->srqn = cpu_to_be32(1 << 24 |
 786                                                to_msrq(ibqp->srq)->srqn);
 787
 788         if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD  &&
 789             attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY               &&
 790             attr->en_sqd_async_notify)
 791                 sqd_event = 1 << 31;
 792
 793         err = mthca_MODIFY_QP(dev, cur_state, new_state, qp->qpn, 0,
 794                               mailbox, sqd_event);
 795         if (err) {
 796                 mthca_warn(dev, "modify QP %d->%d returned %d.\n",
 797                            cur_state, new_state, err);
 798                 goto out_mailbox;
 799         }
 800
 801         qp->state = new_state;
 802         if (attr_mask & IB_QP_ACCESS_FLAGS)
 803                 qp->atomic_rd_en = attr->qp_access_flags;
 804         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 805                 qp->resp_depth = attr->max_dest_rd_atomic;
 806         if (attr_mask & IB_QP_PORT)
 807                 qp->port = attr->port_num;
 808         if (attr_mask & IB_QP_ALT_PATH)
 809                 qp->alt_port = attr->alt_port_num;
 810
 811         if (is_sqp(dev, qp))
 812                 store_attrs(qp->sqp, attr, attr_mask);
 813
 814         /*
 815          * If we moved QP0 to RTR, bring the IB link up; if we moved
 816          * QP0 to RESET or ERROR, bring the link back down.
 817          */
 818         if (is_qp0(dev, qp)) {
 819                 if (cur_state != IB_QPS_RTR &&
 820                     new_state == IB_QPS_RTR)
 821                         init_port(dev, qp->port);
 822
 823                 if (cur_state != IB_QPS_RESET &&
 824                     cur_state != IB_QPS_ERR &&
 825                     (new_state == IB_QPS_RESET ||
 826                      new_state == IB_QPS_ERR))
 827                         mthca_CLOSE_IB(dev, qp->port);
 828         }
 829
 830         /*
 831          * If we moved a kernel QP to RESET, clean up all old CQ
 832          * entries and reinitialize the QP.
 833          */
 834         if (new_state == IB_QPS_RESET && !qp->ibqp.uobject) {
 835                 mthca_cq_clean(dev, to_mcq(qp->ibqp.recv_cq), qp->qpn,
 836                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
 837                 if (qp->ibqp.send_cq != qp->ibqp.recv_cq)
 838                         mthca_cq_clean(dev, to_mcq(qp->ibqp.send_cq), qp->qpn, NULL);
 839
 840                 mthca_wq_reset(&qp->sq);
 841                 qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
 842
 843                 mthca_wq_reset(&qp->rq);
 844                 qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
 845
 846                 if (mthca_is_memfree(dev)) {
 847                         *qp->sq.db = 0;
 848                         *qp->rq.db = 0;
 849                 }
 850         }
 851
 852 out_mailbox:
 853         mthca_free_mailbox(dev, mailbox);
 854 out:
 855         return err;
 856 }
 857
 858 int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask,
 859                     struct ib_udata *udata)
 860 {
 861         struct mthca_dev *dev = to_mdev(ibqp->device);
 862         struct mthca_qp *qp = to_mqp(ibqp);
 863         enum ib_qp_state cur_state, new_state;
 864         int err = -EINVAL;
 865
 866         if (attr_mask & ~IB_QP_ATTR_STANDARD_BITS)
 867                 return -EOPNOTSUPP;
 868
 869         mutex_lock(&qp->mutex);
 870         if (attr_mask & IB_QP_CUR_STATE) {
 871                 cur_state = attr->cur_qp_state;
 872         } else {
 873                 spin_lock_irq(&qp->sq.lock);
 874                 spin_lock(&qp->rq.lock);
 875                 cur_state = qp->state;
 876                 spin_unlock(&qp->rq.lock);
 877                 spin_unlock_irq(&qp->sq.lock);
 878         }
 879
 880         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
 881
 882         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
 883                                 attr_mask)) {
 884                 mthca_dbg(dev, "Bad QP transition (transport %d) "
 885                           "%d->%d with attr 0x%08x\n",
 886                           qp->transport, cur_state, new_state,
 887                           attr_mask);
 888                 goto out;
 889         }
 890
 891         if ((attr_mask & IB_QP_PKEY_INDEX) &&
 892              attr->pkey_index >= dev->limits.pkey_table_len) {
 893                 mthca_dbg(dev, "P_Key index (%u) too large. max is %d\n",
 894                           attr->pkey_index, dev->limits.pkey_table_len-1);
 895                 goto out;
 896         }
 897
 898         if ((attr_mask & IB_QP_PORT) &&
 899             (attr->port_num == 0 || attr->port_num > dev->limits.num_ports)) {
 900                 mthca_dbg(dev, "Port number (%u) is invalid\n", attr->port_num);
 901                 goto out;
 902         }
 903
 904         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
 905             attr->max_rd_atomic > dev->limits.max_qp_init_rdma) {
 906                 mthca_dbg(dev, "Max rdma_atomic as initiator %u too large (max is %d)\n",
 907                           attr->max_rd_atomic, dev->limits.max_qp_init_rdma);
 908                 goto out;
 909         }
 910
 911         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
 912             attr->max_dest_rd_atomic > 1 << dev->qp_table.rdb_shift) {
 913                 mthca_dbg(dev, "Max rdma_atomic as responder %u too large (max %d)\n",
 914                           attr->max_dest_rd_atomic, 1 << dev->qp_table.rdb_shift);
 915                 goto out;
 916         }
 917
 918         if (cur_state == new_state && cur_state == IB_QPS_RESET) {
 919                 err = 0;
 920                 goto out;
 921         }
 922
 923         err = __mthca_modify_qp(ibqp, attr, attr_mask, cur_state, new_state,
 924                                 udata);
 925
 926 out:
 927         mutex_unlock(&qp->mutex);
 928         return err;
 929 }
 930
 931 static int mthca_max_data_size(struct mthca_dev *dev, struct mthca_qp *qp, int desc_sz)
 932 {
 933         /*
 934          * Calculate the maximum size of WQE s/g segments, excluding
 935          * the next segment and other non-data segments.
 936          */
 937         int max_data_size = desc_sz - sizeof (struct mthca_next_seg);
 938
 939         switch (qp->transport) {
 940         case MLX:
 941                 max_data_size -= 2 * sizeof (struct mthca_data_seg);
 942                 break;
 943
 944         case UD:
 945                 if (mthca_is_memfree(dev))
 946                         max_data_size -= sizeof (struct mthca_arbel_ud_seg);
 947                 else
 948                         max_data_size -= sizeof (struct mthca_tavor_ud_seg);
 949                 break;
 950
 951         default:
 952                 max_data_size -= sizeof (struct mthca_raddr_seg);
 953                 break;
 954         }
 955
 956         return max_data_size;
 957 }
 958
 959 static inline int mthca_max_inline_data(struct mthca_pd *pd, int max_data_size)
 960 {
 961         /* We don't support inline data for kernel QPs (yet). */
 962         return pd->ibpd.uobject ? max_data_size - MTHCA_INLINE_HEADER_SIZE : 0;
 963 }
 964
 965 static void mthca_adjust_qp_caps(struct mthca_dev *dev,
 966                                  struct mthca_pd *pd,
 967                                  struct mthca_qp *qp)
 968 {
 969         int max_data_size = mthca_max_data_size(dev, qp,
 970                                                 min(dev->limits.max_desc_sz,
 971                                                     1 << qp->sq.wqe_shift));
 972
 973         qp->max_inline_data = mthca_max_inline_data(pd, max_data_size);
 974
 975         qp->sq.max_gs = min_t(int, dev->limits.max_sg,
 976                               max_data_size / sizeof (struct mthca_data_seg));
 977         qp->rq.max_gs = min_t(int, dev->limits.max_sg,
 978                                (min(dev->limits.max_desc_sz, 1 << qp->rq.wqe_shift) -
 979                                 sizeof (struct mthca_next_seg)) /
 980                                sizeof (struct mthca_data_seg));
 981 }
 982
 983 /*
 984  * Allocate and register buffer for WQEs.  qp->rq.max, sq.max,
 985  * rq.max_gs and sq.max_gs must all be assigned.
 986  * mthca_alloc_wqe_buf will calculate rq.wqe_shift and
 987  * sq.wqe_shift (as well as send_wqe_offset, is_direct, and
 988  * queue)
 989  */
 990 static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 991                                struct mthca_pd *pd,
 992                                struct mthca_qp *qp,
 993                                struct ib_udata *udata)
 994 {
 995         int size;
 996         int err = -ENOMEM;
 997
 998         size = sizeof (struct mthca_next_seg) +
 999                 qp->rq.max_gs * sizeof (struct mthca_data_seg);
1000
1001         if (size > dev->limits.max_desc_sz)
1002                 return -EINVAL;
1003
1004         for (qp->rq.wqe_shift = 6; 1 << qp->rq.wqe_shift < size;
1005              qp->rq.wqe_shift++)
1006                 ; /* nothing */
1007
1008         size = qp->sq.max_gs * sizeof (struct mthca_data_seg);
1009         switch (qp->transport) {
1010         case MLX:
1011                 size += 2 * sizeof (struct mthca_data_seg);
1012                 break;
1013
1014         case UD:
1015                 size += mthca_is_memfree(dev) ?
1016                         sizeof (struct mthca_arbel_ud_seg) :
1017                         sizeof (struct mthca_tavor_ud_seg);
1018                 break;
1019
1020         case UC:
1021                 size += sizeof (struct mthca_raddr_seg);
1022                 break;
1023
1024         case RC:
1025                 size += sizeof (struct mthca_raddr_seg);
1026                 /*
1027                  * An atomic op will require an atomic segment, a
1028                  * remote address segment and one scatter entry.
1029                  */
1030                 size = max_t(int, size,
1031                              sizeof (struct mthca_atomic_seg) +
1032                              sizeof (struct mthca_raddr_seg) +
1033                              sizeof (struct mthca_data_seg));
1034                 break;
1035
1036         default:
1037                 break;
1038         }
1039
1040         /* Make sure that we have enough space for a bind request */
1041         size = max_t(int, size, sizeof (struct mthca_bind_seg));
1042
1043         size += sizeof (struct mthca_next_seg);
1044
1045         if (size > dev->limits.max_desc_sz)
1046                 return -EINVAL;
1047
1048         for (qp->sq.wqe_shift = 6; 1 << qp->sq.wqe_shift < size;
1049              qp->sq.wqe_shift++)
1050                 ; /* nothing */
1051
1052         qp->send_wqe_offset = ALIGN(qp->rq.max << qp->rq.wqe_shift,
1053                                     1 << qp->sq.wqe_shift);
1054
1055         /*
1056          * If this is a userspace QP, we don't actually have to
1057          * allocate anything.  All we need is to calculate the WQE
1058          * sizes and the send_wqe_offset, so we're done now.
1059          */
1060         if (udata)
1061                 return 0;
1062
1063         size = PAGE_ALIGN(qp->send_wqe_offset +
1064                           (qp->sq.max << qp->sq.wqe_shift));
1065
1066         qp->wrid = kmalloc_array(qp->rq.max + qp->sq.max, sizeof(u64),
1067                                  GFP_KERNEL);
1068         if (!qp->wrid)
1069                 goto err_out;
1070
1071         err = mthca_buf_alloc(dev, size, MTHCA_MAX_DIRECT_QP_SIZE,
1072                               &qp->queue, &qp->is_direct, pd, 0, &qp->mr);
1073         if (err)
1074                 goto err_out;
1075
1076         return 0;
1077
1078 err_out:
1079         kfree(qp->wrid);
1080         return err;
1081 }
1082
1083 static void mthca_free_wqe_buf(struct mthca_dev *dev,
1084                                struct mthca_qp *qp)
1085 {
1086         mthca_buf_free(dev, PAGE_ALIGN(qp->send_wqe_offset +
1087                                        (qp->sq.max << qp->sq.wqe_shift)),
1088                        &qp->queue, qp->is_direct, &qp->mr);
1089         kfree(qp->wrid);
1090 }
1091
1092 static int mthca_map_memfree(struct mthca_dev *dev,
1093                              struct mthca_qp *qp)
1094 {
1095         int ret;
1096
1097         if (mthca_is_memfree(dev)) {
1098                 ret = mthca_table_get(dev, dev->qp_table.qp_table, qp->qpn);
1099                 if (ret)
1100                         return ret;
1101
1102                 ret = mthca_table_get(dev, dev->qp_table.eqp_table, qp->qpn);
1103                 if (ret)
1104                         goto err_qpc;
1105
1106                 ret = mthca_table_get(dev, dev->qp_table.rdb_table,
1107                                       qp->qpn << dev->qp_table.rdb_shift);
1108                 if (ret)
1109                         goto err_eqpc;
1110
1111         }
1112
1113         return 0;
1114
1115 err_eqpc:
1116         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1117
1118 err_qpc:
1119         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1120
1121         return ret;
1122 }
1123
1124 static void mthca_unmap_memfree(struct mthca_dev *dev,
1125                                 struct mthca_qp *qp)
1126 {
1127         mthca_table_put(dev, dev->qp_table.rdb_table,
1128                         qp->qpn << dev->qp_table.rdb_shift);
1129         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1130         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1131 }
1132
1133 static int mthca_alloc_memfree(struct mthca_dev *dev,
1134                                struct mthca_qp *qp)
1135 {
1136         if (mthca_is_memfree(dev)) {
1137                 qp->rq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_RQ,
1138                                                  qp->qpn, &qp->rq.db);
1139                 if (qp->rq.db_index < 0)
1140                         return -ENOMEM;
1141
1142                 qp->sq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SQ,
1143                                                  qp->qpn, &qp->sq.db);
1144                 if (qp->sq.db_index < 0) {
1145                         mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1146                         return -ENOMEM;
1147                 }
1148         }
1149
1150         return 0;
1151 }
1152
1153 static void mthca_free_memfree(struct mthca_dev *dev,
1154                                struct mthca_qp *qp)
1155 {
1156         if (mthca_is_memfree(dev)) {
1157                 mthca_free_db(dev, MTHCA_DB_TYPE_SQ, qp->sq.db_index);
1158                 mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1159         }
1160 }
1161
1162 static int mthca_alloc_qp_common(struct mthca_dev *dev,
1163                                  struct mthca_pd *pd,
1164                                  struct mthca_cq *send_cq,
1165                                  struct mthca_cq *recv_cq,
1166                                  enum ib_sig_type send_policy,
1167                                  struct mthca_qp *qp,
1168                                  struct ib_udata *udata)
1169 {
1170         int ret;
1171         int i;
1172         struct mthca_next_seg *next;
1173
1174         qp->refcount = 1;
1175         init_waitqueue_head(&qp->wait);
1176         mutex_init(&qp->mutex);
1177         qp->state        = IB_QPS_RESET;
1178         qp->atomic_rd_en = 0;
1179         qp->resp_depth   = 0;
1180         qp->sq_policy    = send_policy;
1181         mthca_wq_reset(&qp->sq);
1182         mthca_wq_reset(&qp->rq);
1183
1184         spin_lock_init(&qp->sq.lock);
1185         spin_lock_init(&qp->rq.lock);
1186
1187         ret = mthca_map_memfree(dev, qp);
1188         if (ret)
1189                 return ret;
1190
1191         ret = mthca_alloc_wqe_buf(dev, pd, qp, udata);
1192         if (ret) {
1193                 mthca_unmap_memfree(dev, qp);
1194                 return ret;
1195         }
1196
1197         mthca_adjust_qp_caps(dev, pd, qp);
1198
1199         /*
1200          * If this is a userspace QP, we're done now.  The doorbells
1201          * will be allocated and buffers will be initialized in
1202          * userspace.
1203          */
1204         if (udata)
1205                 return 0;
1206
1207         ret = mthca_alloc_memfree(dev, qp);
1208         if (ret) {
1209                 mthca_free_wqe_buf(dev, qp);
1210                 mthca_unmap_memfree(dev, qp);
1211                 return ret;
1212         }
1213
1214         if (mthca_is_memfree(dev)) {
1215                 struct mthca_data_seg *scatter;
1216                 int size = (sizeof (struct mthca_next_seg) +
1217                             qp->rq.max_gs * sizeof (struct mthca_data_seg)) / 16;
1218
1219                 for (i = 0; i < qp->rq.max; ++i) {
1220                         next = get_recv_wqe(qp, i);
1221                         next->nda_op = cpu_to_be32(((i + 1) & (qp->rq.max - 1)) <<
1222                                                    qp->rq.wqe_shift);
1223                         next->ee_nds = cpu_to_be32(size);
1224
1225                         for (scatter = (void *) (next + 1);
1226                              (void *) scatter < (void *) next + (1 << qp->rq.wqe_shift);
1227                              ++scatter)
1228                                 scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
1229                 }
1230
1231                 for (i = 0; i < qp->sq.max; ++i) {
1232                         next = get_send_wqe(qp, i);
1233                         next->nda_op = cpu_to_be32((((i + 1) & (qp->sq.max - 1)) <<
1234                                                     qp->sq.wqe_shift) +
1235                                                    qp->send_wqe_offset);
1236                 }
1237         } else {
1238                 for (i = 0; i < qp->rq.max; ++i) {
1239                         next = get_recv_wqe(qp, i);
1240                         next->nda_op = htonl((((i + 1) % qp->rq.max) <<
1241                                               qp->rq.wqe_shift) | 1);
1242                 }
1243
1244         }
1245
1246         qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
1247         qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
1248
1249         return 0;
1250 }
1251
1252 static int mthca_set_qp_size(struct mthca_dev *dev, struct ib_qp_cap *cap,
1253                              struct mthca_pd *pd, struct mthca_qp *qp)
1254 {
1255         int max_data_size = mthca_max_data_size(dev, qp, dev->limits.max_desc_sz);
1256
1257         /* Sanity check QP size before proceeding */
1258         if (cap->max_send_wr     > dev->limits.max_wqes ||
1259             cap->max_recv_wr     > dev->limits.max_wqes ||
1260             cap->max_send_sge    > dev->limits.max_sg   ||
1261             cap->max_recv_sge    > dev->limits.max_sg   ||
1262             cap->max_inline_data > mthca_max_inline_data(pd, max_data_size))
1263                 return -EINVAL;
1264
1265         /*
1266          * For MLX transport we need 2 extra send gather entries:
1267          * one for the header and one for the checksum at the end
1268          */
1269         if (qp->transport == MLX && cap->max_send_sge + 2 > dev->limits.max_sg)
1270                 return -EINVAL;
1271
1272         if (mthca_is_memfree(dev)) {
1273                 qp->rq.max = cap->max_recv_wr ?
1274                         roundup_pow_of_two(cap->max_recv_wr) : 0;
1275                 qp->sq.max = cap->max_send_wr ?
1276                         roundup_pow_of_two(cap->max_send_wr) : 0;
1277         } else {
1278                 qp->rq.max = cap->max_recv_wr;
1279                 qp->sq.max = cap->max_send_wr;
1280         }
1281
1282         qp->rq.max_gs = cap->max_recv_sge;
1283         qp->sq.max_gs = max_t(int, cap->max_send_sge,
1284                               ALIGN(cap->max_inline_data + MTHCA_INLINE_HEADER_SIZE,
1285                                     MTHCA_INLINE_CHUNK_SIZE) /
1286                               sizeof (struct mthca_data_seg));
1287
1288         return 0;
1289 }
1290
1291 int mthca_alloc_qp(struct mthca_dev *dev,
1292                    struct mthca_pd *pd,
1293                    struct mthca_cq *send_cq,
1294                    struct mthca_cq *recv_cq,
1295                    enum ib_qp_type type,
1296                    enum ib_sig_type send_policy,
1297                    struct ib_qp_cap *cap,
1298                    struct mthca_qp *qp,
1299                    struct ib_udata *udata)
1300 {
1301         int err;
1302
1303         switch (type) {
1304         case IB_QPT_RC: qp->transport = RC; break;
1305         case IB_QPT_UC: qp->transport = UC; break;
1306         case IB_QPT_UD: qp->transport = UD; break;
1307         default: return -EINVAL;
1308         }
1309
1310         err = mthca_set_qp_size(dev, cap, pd, qp);
1311         if (err)
1312                 return err;
1313
1314         qp->qpn = mthca_alloc(&dev->qp_table.alloc);
1315         if (qp->qpn == -1)
1316                 return -ENOMEM;
1317
1318         /* initialize port to zero for error-catching. */
1319         qp->port = 0;
1320
1321         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1322                                     send_policy, qp, udata);
1323         if (err) {
1324                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1325                 return err;
1326         }
1327
1328         spin_lock_irq(&dev->qp_table.lock);
1329         mthca_array_set(&dev->qp_table.qp,
1330                         qp->qpn & (dev->limits.num_qps - 1), qp);
1331         spin_unlock_irq(&dev->qp_table.lock);
1332
1333         return 0;
1334 }
1335
1336 static void mthca_lock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq)
1337         __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
1338 {
1339         if (send_cq == recv_cq) {
1340                 spin_lock_irq(&send_cq->lock);
1341                 __acquire(&recv_cq->lock);
1342         } else if (send_cq->cqn < recv_cq->cqn) {
1343                 spin_lock_irq(&send_cq->lock);
1344                 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
1345         } else {
1346                 spin_lock_irq(&recv_cq->lock);
1347                 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
1348         }
1349 }
1350
1351 static void mthca_unlock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq)
1352         __releases(&send_cq->lock) __releases(&recv_cq->lock)
1353 {
1354         if (send_cq == recv_cq) {
1355                 __release(&recv_cq->lock);
1356                 spin_unlock_irq(&send_cq->lock);
1357         } else if (send_cq->cqn < recv_cq->cqn) {
1358                 spin_unlock(&recv_cq->lock);
1359                 spin_unlock_irq(&send_cq->lock);
1360         } else {
1361                 spin_unlock(&send_cq->lock);
1362                 spin_unlock_irq(&recv_cq->lock);
1363         }
1364 }
1365
1366 int mthca_alloc_sqp(struct mthca_dev *dev,
1367                     struct mthca_pd *pd,
1368                     struct mthca_cq *send_cq,
1369                     struct mthca_cq *recv_cq,
1370                     enum ib_sig_type send_policy,
1371                     struct ib_qp_cap *cap,
1372                     int qpn,
1373                     u32 port,
1374                     struct mthca_qp *qp,
1375                     struct ib_udata *udata)
1376 {
1377         u32 mqpn = qpn * 2 + dev->qp_table.sqp_start + port - 1;
1378         int err;
1379
1380         qp->transport = MLX;
1381         err = mthca_set_qp_size(dev, cap, pd, qp);
1382         if (err)
1383                 return err;
1384
1385         qp->sqp->header_buf_size = qp->sq.max * MTHCA_UD_HEADER_SIZE;
1386         qp->sqp->header_buf =
1387                 dma_alloc_coherent(&dev->pdev->dev, qp->sqp->header_buf_size,
1388                                    &qp->sqp->header_dma, GFP_KERNEL);
1389         if (!qp->sqp->header_buf)
1390                 return -ENOMEM;
1391
1392         spin_lock_irq(&dev->qp_table.lock);
1393         if (mthca_array_get(&dev->qp_table.qp, mqpn))
1394                 err = -EBUSY;
1395         else
1396                 mthca_array_set(&dev->qp_table.qp, mqpn, qp->sqp);
1397         spin_unlock_irq(&dev->qp_table.lock);
1398
1399         if (err)
1400                 goto err_out;
1401
1402         qp->port      = port;
1403         qp->qpn       = mqpn;
1404         qp->transport = MLX;
1405
1406         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1407                                     send_policy, qp, udata);
1408         if (err)
1409                 goto err_out_free;
1410
1411         atomic_inc(&pd->sqp_count);
1412
1413         return 0;
1414
1415  err_out_free:
1416         /*
1417          * Lock CQs here, so that CQ polling code can do QP lookup
1418          * without taking a lock.
1419          */
1420         mthca_lock_cqs(send_cq, recv_cq);
1421
1422         spin_lock(&dev->qp_table.lock);
1423         mthca_array_clear(&dev->qp_table.qp, mqpn);
1424         spin_unlock(&dev->qp_table.lock);
1425
1426         mthca_unlock_cqs(send_cq, recv_cq);
1427
1428 err_out:
1429         dma_free_coherent(&dev->pdev->dev, qp->sqp->header_buf_size,
1430                           qp->sqp->header_buf, qp->sqp->header_dma);
1431         return err;
1432 }
1433
1434 static inline int get_qp_refcount(struct mthca_dev *dev, struct mthca_qp *qp)
1435 {
1436         int c;
1437
1438         spin_lock_irq(&dev->qp_table.lock);
1439         c = qp->refcount;
1440         spin_unlock_irq(&dev->qp_table.lock);
1441
1442         return c;
1443 }
1444
1445 void mthca_free_qp(struct mthca_dev *dev,
1446                    struct mthca_qp *qp)
1447 {
1448         struct mthca_cq *send_cq;
1449         struct mthca_cq *recv_cq;
1450
1451         send_cq = to_mcq(qp->ibqp.send_cq);
1452         recv_cq = to_mcq(qp->ibqp.recv_cq);
1453
1454         /*
1455          * Lock CQs here, so that CQ polling code can do QP lookup
1456          * without taking a lock.
1457          */
1458         mthca_lock_cqs(send_cq, recv_cq);
1459
1460         spin_lock(&dev->qp_table.lock);
1461         mthca_array_clear(&dev->qp_table.qp,
1462                           qp->qpn & (dev->limits.num_qps - 1));
1463         --qp->refcount;
1464         spin_unlock(&dev->qp_table.lock);
1465
1466         mthca_unlock_cqs(send_cq, recv_cq);
1467
1468         wait_event(qp->wait, !get_qp_refcount(dev, qp));
1469
1470         if (qp->state != IB_QPS_RESET)
1471                 mthca_MODIFY_QP(dev, qp->state, IB_QPS_RESET, qp->qpn, 0,
1472                                 NULL, 0);
1473
1474         /*
1475          * If this is a userspace QP, the buffers, MR, CQs and so on
1476          * will be cleaned up in userspace, so all we have to do is
1477          * unref the mem-free tables and free the QPN in our table.
1478          */
1479         if (!qp->ibqp.uobject) {
1480                 mthca_cq_clean(dev, recv_cq, qp->qpn,
1481                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
1482                 if (send_cq != recv_cq)
1483                         mthca_cq_clean(dev, send_cq, qp->qpn, NULL);
1484
1485                 mthca_free_memfree(dev, qp);
1486                 mthca_free_wqe_buf(dev, qp);
1487         }
1488
1489         mthca_unmap_memfree(dev, qp);
1490
1491         if (is_sqp(dev, qp)) {
1492                 atomic_dec(&(to_mpd(qp->ibqp.pd)->sqp_count));
1493                 dma_free_coherent(&dev->pdev->dev, qp->sqp->header_buf_size,
1494                                   qp->sqp->header_buf, qp->sqp->header_dma);
1495         } else
1496                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1497 }
1498
1499 /* Create UD header for an MLX send and build a data segment for it */
1500 static int build_mlx_header(struct mthca_dev *dev, struct mthca_qp *qp, int ind,
1501                             const struct ib_ud_wr *wr,
1502                             struct mthca_mlx_seg *mlx,
1503                             struct mthca_data_seg *data)
1504 {
1505         struct mthca_sqp *sqp = qp->sqp;
1506         int header_size;
1507         int err;
1508         u16 pkey;
1509
1510         ib_ud_header_init(256, /* assume a MAD */ 1, 0, 0,
1511                           mthca_ah_grh_present(to_mah(wr->ah)), 0, 0, 0,
1512                           &sqp->ud_header);
1513
1514         err = mthca_read_ah(dev, to_mah(wr->ah), &sqp->ud_header);
1515         if (err)
1516                 return err;
1517         mlx->flags &= ~cpu_to_be32(MTHCA_NEXT_SOLICIT | 1);
1518         mlx->flags |= cpu_to_be32((!qp->ibqp.qp_num ? MTHCA_MLX_VL15 : 0) |
1519                                   (sqp->ud_header.lrh.destination_lid ==
1520                                    IB_LID_PERMISSIVE ? MTHCA_MLX_SLR : 0) |
1521                                   (sqp->ud_header.lrh.service_level << 8));
1522         mlx->rlid = sqp->ud_header.lrh.destination_lid;
1523         mlx->vcrc = 0;
1524
1525         switch (wr->wr.opcode) {
1526         case IB_WR_SEND:
1527                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1528                 sqp->ud_header.immediate_present = 0;
1529                 break;
1530         case IB_WR_SEND_WITH_IMM:
1531                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1532                 sqp->ud_header.immediate_present = 1;
1533                 sqp->ud_header.immediate_data = wr->wr.ex.imm_data;
1534                 break;
1535         default:
1536                 return -EINVAL;
1537         }
1538
1539         sqp->ud_header.lrh.virtual_lane    = !qp->ibqp.qp_num ? 15 : 0;
1540         if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1541                 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1542         sqp->ud_header.bth.solicited_event = !!(wr->wr.send_flags & IB_SEND_SOLICITED);
1543         if (!qp->ibqp.qp_num)
1544                 ib_get_cached_pkey(&dev->ib_dev, qp->port, sqp->pkey_index,
1545                                    &pkey);
1546         else
1547                 ib_get_cached_pkey(&dev->ib_dev, qp->port, wr->pkey_index,
1548                                    &pkey);
1549         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1550         sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->remote_qpn);
1551         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1552         sqp->ud_header.deth.qkey = cpu_to_be32(wr->remote_qkey & 0x80000000 ?
1553                                                sqp->qkey : wr->remote_qkey);
1554         sqp->ud_header.deth.source_qpn = cpu_to_be32(qp->ibqp.qp_num);
1555
1556         header_size = ib_ud_header_pack(&sqp->ud_header,
1557                                         sqp->header_buf +
1558                                         ind * MTHCA_UD_HEADER_SIZE);
1559
1560         data->byte_count = cpu_to_be32(header_size);
1561         data->lkey       = cpu_to_be32(to_mpd(qp->ibqp.pd)->ntmr.ibmr.lkey);
1562         data->addr       = cpu_to_be64(sqp->header_dma +
1563                                        ind * MTHCA_UD_HEADER_SIZE);
1564
1565         return 0;
1566 }
1567
1568 static inline int mthca_wq_overflow(struct mthca_wq *wq, int nreq,
1569                                     struct ib_cq *ib_cq)
1570 {
1571         unsigned cur;
1572         struct mthca_cq *cq;
1573
1574         cur = wq->head - wq->tail;
1575         if (likely(cur + nreq < wq->max))
1576                 return 0;
1577
1578         cq = to_mcq(ib_cq);
1579         spin_lock(&cq->lock);
1580         cur = wq->head - wq->tail;
1581         spin_unlock(&cq->lock);
1582
1583         return cur + nreq >= wq->max;
1584 }
1585
1586 static __always_inline void set_raddr_seg(struct mthca_raddr_seg *rseg,
1587                                           u64 remote_addr, u32 rkey)
1588 {
1589         rseg->raddr    = cpu_to_be64(remote_addr);
1590         rseg->rkey     = cpu_to_be32(rkey);
1591         rseg->reserved = 0;
1592 }
1593
1594 static __always_inline void set_atomic_seg(struct mthca_atomic_seg *aseg,
1595                                            const struct ib_atomic_wr *wr)
1596 {
1597         if (wr->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1598                 aseg->swap_add = cpu_to_be64(wr->swap);
1599                 aseg->compare  = cpu_to_be64(wr->compare_add);
1600         } else {
1601                 aseg->swap_add = cpu_to_be64(wr->compare_add);
1602                 aseg->compare  = 0;
1603         }
1604
1605 }
1606
1607 static void set_tavor_ud_seg(struct mthca_tavor_ud_seg *useg,
1608                              const struct ib_ud_wr *wr)
1609 {
1610         useg->lkey    = cpu_to_be32(to_mah(wr->ah)->key);
1611         useg->av_addr = cpu_to_be64(to_mah(wr->ah)->avdma);
1612         useg->dqpn    = cpu_to_be32(wr->remote_qpn);
1613         useg->qkey    = cpu_to_be32(wr->remote_qkey);
1614
1615 }
1616
1617 static void set_arbel_ud_seg(struct mthca_arbel_ud_seg *useg,
1618                              const struct ib_ud_wr *wr)
1619 {
1620         memcpy(useg->av, to_mah(wr->ah)->av, MTHCA_AV_SIZE);
1621         useg->dqpn = cpu_to_be32(wr->remote_qpn);
1622         useg->qkey = cpu_to_be32(wr->remote_qkey);
1623 }
1624
1625 int mthca_tavor_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
1626                           const struct ib_send_wr **bad_wr)
1627 {
1628         struct mthca_dev *dev = to_mdev(ibqp->device);
1629         struct mthca_qp *qp = to_mqp(ibqp);
1630         void *wqe;
1631         void *prev_wqe;
1632         unsigned long flags;
1633         int err = 0;
1634         int nreq;
1635         int i;
1636         int size;
1637         /*
1638          * f0 and size0 are only used if nreq != 0, and they will
1639          * always be initialized the first time through the main loop
1640          * before nreq is incremented.  So nreq cannot become non-zero
1641          * without initializing f0 and size0, and they are in fact
1642          * never used uninitialized.
1643          */
1644         int size0;
1645         u32 f0;
1646         int ind;
1647         u8 op0 = 0;
1648
1649         spin_lock_irqsave(&qp->sq.lock, flags);
1650
1651         /* XXX check that state is OK to post send */
1652
1653         ind = qp->sq.next_ind;
1654
1655         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1656                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1657                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1658                                         " %d max, %d nreq)\n", qp->qpn,
1659                                         qp->sq.head, qp->sq.tail,
1660                                         qp->sq.max, nreq);
1661                         err = -ENOMEM;
1662                         *bad_wr = wr;
1663                         goto out;
1664                 }
1665
1666                 wqe = get_send_wqe(qp, ind);
1667                 prev_wqe = qp->sq.last;
1668                 qp->sq.last = wqe;
1669
1670                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
1671                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
1672                 ((struct mthca_next_seg *) wqe)->flags =
1673                         ((wr->send_flags & IB_SEND_SIGNALED) ?
1674                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
1675                         ((wr->send_flags & IB_SEND_SOLICITED) ?
1676                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
1677                         cpu_to_be32(1);
1678                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1679                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1680                         ((struct mthca_next_seg *) wqe)->imm = wr->ex.imm_data;
1681
1682                 wqe += sizeof (struct mthca_next_seg);
1683                 size = sizeof (struct mthca_next_seg) / 16;
1684
1685                 switch (qp->transport) {
1686                 case RC:
1687                         switch (wr->opcode) {
1688                         case IB_WR_ATOMIC_CMP_AND_SWP:
1689                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1690                                 set_raddr_seg(wqe, atomic_wr(wr)->remote_addr,
1691                                               atomic_wr(wr)->rkey);
1692                                 wqe += sizeof (struct mthca_raddr_seg);
1693
1694                                 set_atomic_seg(wqe, atomic_wr(wr));
1695                                 wqe += sizeof (struct mthca_atomic_seg);
1696                                 size += (sizeof (struct mthca_raddr_seg) +
1697                                          sizeof (struct mthca_atomic_seg)) / 16;
1698                                 break;
1699
1700                         case IB_WR_RDMA_WRITE:
1701                         case IB_WR_RDMA_WRITE_WITH_IMM:
1702                         case IB_WR_RDMA_READ:
1703                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
1704                                               rdma_wr(wr)->rkey);
1705                                 wqe  += sizeof (struct mthca_raddr_seg);
1706                                 size += sizeof (struct mthca_raddr_seg) / 16;
1707                                 break;
1708
1709                         default:
1710                                 /* No extra segments required for sends */
1711                                 break;
1712                         }
1713
1714                         break;
1715
1716                 case UC:
1717                         switch (wr->opcode) {
1718                         case IB_WR_RDMA_WRITE:
1719                         case IB_WR_RDMA_WRITE_WITH_IMM:
1720                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
1721                                               rdma_wr(wr)->rkey);
1722                                 wqe  += sizeof (struct mthca_raddr_seg);
1723                                 size += sizeof (struct mthca_raddr_seg) / 16;
1724                                 break;
1725
1726                         default:
1727                                 /* No extra segments required for sends */
1728                                 break;
1729                         }
1730
1731                         break;
1732
1733                 case UD:
1734                         set_tavor_ud_seg(wqe, ud_wr(wr));
1735                         wqe  += sizeof (struct mthca_tavor_ud_seg);
1736                         size += sizeof (struct mthca_tavor_ud_seg) / 16;
1737                         break;
1738
1739                 case MLX:
1740                         err = build_mlx_header(
1741                                 dev, qp, ind, ud_wr(wr),
1742                                 wqe - sizeof(struct mthca_next_seg), wqe);
1743                         if (err) {
1744                                 *bad_wr = wr;
1745                                 goto out;
1746                         }
1747                         wqe += sizeof (struct mthca_data_seg);
1748                         size += sizeof (struct mthca_data_seg) / 16;
1749                         break;
1750                 }
1751
1752                 if (wr->num_sge > qp->sq.max_gs) {
1753                         mthca_err(dev, "too many gathers\n");
1754                         err = -EINVAL;
1755                         *bad_wr = wr;
1756                         goto out;
1757                 }
1758
1759                 for (i = 0; i < wr->num_sge; ++i) {
1760                         mthca_set_data_seg(wqe, wr->sg_list + i);
1761                         wqe  += sizeof (struct mthca_data_seg);
1762                         size += sizeof (struct mthca_data_seg) / 16;
1763                 }
1764
1765                 /* Add one more inline data segment for ICRC */
1766                 if (qp->transport == MLX) {
1767                         ((struct mthca_data_seg *) wqe)->byte_count =
1768                                 cpu_to_be32((1 << 31) | 4);
1769                         ((u32 *) wqe)[1] = 0;
1770                         wqe += sizeof (struct mthca_data_seg);
1771                         size += sizeof (struct mthca_data_seg) / 16;
1772                 }
1773
1774                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
1775
1776                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
1777                         mthca_err(dev, "opcode invalid\n");
1778                         err = -EINVAL;
1779                         *bad_wr = wr;
1780                         goto out;
1781                 }
1782
1783                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1784                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
1785                                      qp->send_wqe_offset) |
1786                                     mthca_opcode[wr->opcode]);
1787                 wmb();
1788                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1789                         cpu_to_be32((nreq ? 0 : MTHCA_NEXT_DBD) | size |
1790                                     ((wr->send_flags & IB_SEND_FENCE) ?
1791                                     MTHCA_NEXT_FENCE : 0));
1792
1793                 if (!nreq) {
1794                         size0 = size;
1795                         op0   = mthca_opcode[wr->opcode];
1796                         f0    = wr->send_flags & IB_SEND_FENCE ?
1797                                 MTHCA_SEND_DOORBELL_FENCE : 0;
1798                 }
1799
1800                 ++ind;
1801                 if (unlikely(ind >= qp->sq.max))
1802                         ind -= qp->sq.max;
1803         }
1804
1805 out:
1806         if (likely(nreq)) {
1807                 wmb();
1808
1809                 mthca_write64(((qp->sq.next_ind << qp->sq.wqe_shift) +
1810                                qp->send_wqe_offset) | f0 | op0,
1811                               (qp->qpn << 8) | size0,
1812                               dev->kar + MTHCA_SEND_DOORBELL,
1813                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1814         }
1815
1816         qp->sq.next_ind = ind;
1817         qp->sq.head    += nreq;
1818
1819         spin_unlock_irqrestore(&qp->sq.lock, flags);
1820         return err;
1821 }
1822
1823 int mthca_tavor_post_receive(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
1824                              const struct ib_recv_wr **bad_wr)
1825 {
1826         struct mthca_dev *dev = to_mdev(ibqp->device);
1827         struct mthca_qp *qp = to_mqp(ibqp);
1828         unsigned long flags;
1829         int err = 0;
1830         int nreq;
1831         int i;
1832         int size;
1833         /*
1834          * size0 is only used if nreq != 0, and it will always be
1835          * initialized the first time through the main loop before
1836          * nreq is incremented.  So nreq cannot become non-zero
1837          * without initializing size0, and it is in fact never used
1838          * uninitialized.
1839          */
1840         int size0;
1841         int ind;
1842         void *wqe;
1843         void *prev_wqe;
1844
1845         spin_lock_irqsave(&qp->rq.lock, flags);
1846
1847         /* XXX check that state is OK to post receive */
1848
1849         ind = qp->rq.next_ind;
1850
1851         for (nreq = 0; wr; wr = wr->next) {
1852                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1853                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
1854                                         " %d max, %d nreq)\n", qp->qpn,
1855                                         qp->rq.head, qp->rq.tail,
1856                                         qp->rq.max, nreq);
1857                         err = -ENOMEM;
1858                         *bad_wr = wr;
1859                         goto out;
1860                 }
1861
1862                 wqe = get_recv_wqe(qp, ind);
1863                 prev_wqe = qp->rq.last;
1864                 qp->rq.last = wqe;
1865
1866                 ((struct mthca_next_seg *) wqe)->ee_nds =
1867                         cpu_to_be32(MTHCA_NEXT_DBD);
1868                 ((struct mthca_next_seg *) wqe)->flags = 0;
1869
1870                 wqe += sizeof (struct mthca_next_seg);
1871                 size = sizeof (struct mthca_next_seg) / 16;
1872
1873                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1874                         err = -EINVAL;
1875                         *bad_wr = wr;
1876                         goto out;
1877                 }
1878
1879                 for (i = 0; i < wr->num_sge; ++i) {
1880                         mthca_set_data_seg(wqe, wr->sg_list + i);
1881                         wqe  += sizeof (struct mthca_data_seg);
1882                         size += sizeof (struct mthca_data_seg) / 16;
1883                 }
1884
1885                 qp->wrid[ind] = wr->wr_id;
1886
1887                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1888                         cpu_to_be32(MTHCA_NEXT_DBD | size);
1889
1890                 if (!nreq)
1891                         size0 = size;
1892
1893                 ++ind;
1894                 if (unlikely(ind >= qp->rq.max))
1895                         ind -= qp->rq.max;
1896
1897                 ++nreq;
1898                 if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
1899                         nreq = 0;
1900
1901                         wmb();
1902
1903                         mthca_write64((qp->rq.next_ind << qp->rq.wqe_shift) | size0,
1904                                       qp->qpn << 8, dev->kar + MTHCA_RECEIVE_DOORBELL,
1905                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1906
1907                         qp->rq.next_ind = ind;
1908                         qp->rq.head += MTHCA_TAVOR_MAX_WQES_PER_RECV_DB;
1909                 }
1910         }
1911
1912 out:
1913         if (likely(nreq)) {
1914                 wmb();
1915
1916                 mthca_write64((qp->rq.next_ind << qp->rq.wqe_shift) | size0,
1917                               qp->qpn << 8 | nreq, dev->kar + MTHCA_RECEIVE_DOORBELL,
1918                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1919         }
1920
1921         qp->rq.next_ind = ind;
1922         qp->rq.head    += nreq;
1923
1924         spin_unlock_irqrestore(&qp->rq.lock, flags);
1925         return err;
1926 }
1927
1928 int mthca_arbel_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
1929                           const struct ib_send_wr **bad_wr)
1930 {
1931         struct mthca_dev *dev = to_mdev(ibqp->device);
1932         struct mthca_qp *qp = to_mqp(ibqp);
1933         u32 dbhi;
1934         void *wqe;
1935         void *prev_wqe;
1936         unsigned long flags;
1937         int err = 0;
1938         int nreq;
1939         int i;
1940         int size;
1941         /*
1942          * f0 and size0 are only used if nreq != 0, and they will
1943          * always be initialized the first time through the main loop
1944          * before nreq is incremented.  So nreq cannot become non-zero
1945          * without initializing f0 and size0, and they are in fact
1946          * never used uninitialized.
1947          */
1948         int size0;
1949         u32 f0;
1950         int ind;
1951         u8 op0 = 0;
1952
1953         spin_lock_irqsave(&qp->sq.lock, flags);
1954
1955         /* XXX check that state is OK to post send */
1956
1957         ind = qp->sq.head & (qp->sq.max - 1);
1958
1959         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1960                 if (unlikely(nreq == MTHCA_ARBEL_MAX_WQES_PER_SEND_DB)) {
1961                         nreq = 0;
1962
1963                         dbhi = (MTHCA_ARBEL_MAX_WQES_PER_SEND_DB << 24) |
1964                                 ((qp->sq.head & 0xffff) << 8) | f0 | op0;
1965
1966                         qp->sq.head += MTHCA_ARBEL_MAX_WQES_PER_SEND_DB;
1967
1968                         /*
1969                          * Make sure that descriptors are written before
1970                          * doorbell record.
1971                          */
1972                         wmb();
1973                         *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
1974
1975                         /*
1976                          * Make sure doorbell record is written before we
1977                          * write MMIO send doorbell.
1978                          */
1979                         wmb();
1980
1981                         mthca_write64(dbhi, (qp->qpn << 8) | size0,
1982                                       dev->kar + MTHCA_SEND_DOORBELL,
1983                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1984                 }
1985
1986                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1987                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1988                                         " %d max, %d nreq)\n", qp->qpn,
1989                                         qp->sq.head, qp->sq.tail,
1990                                         qp->sq.max, nreq);
1991                         err = -ENOMEM;
1992                         *bad_wr = wr;
1993                         goto out;
1994                 }
1995
1996                 wqe = get_send_wqe(qp, ind);
1997                 prev_wqe = qp->sq.last;
1998                 qp->sq.last = wqe;
1999
2000                 ((struct mthca_next_seg *) wqe)->flags =
2001                         ((wr->send_flags & IB_SEND_SIGNALED) ?
2002                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
2003                         ((wr->send_flags & IB_SEND_SOLICITED) ?
2004                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
2005                         ((wr->send_flags & IB_SEND_IP_CSUM) ?
2006                          cpu_to_be32(MTHCA_NEXT_IP_CSUM | MTHCA_NEXT_TCP_UDP_CSUM) : 0) |
2007                         cpu_to_be32(1);
2008                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
2009                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
2010                         ((struct mthca_next_seg *) wqe)->imm = wr->ex.imm_data;
2011
2012                 wqe += sizeof (struct mthca_next_seg);
2013                 size = sizeof (struct mthca_next_seg) / 16;
2014
2015                 switch (qp->transport) {
2016                 case RC:
2017                         switch (wr->opcode) {
2018                         case IB_WR_ATOMIC_CMP_AND_SWP:
2019                         case IB_WR_ATOMIC_FETCH_AND_ADD:
2020                                 set_raddr_seg(wqe, atomic_wr(wr)->remote_addr,
2021                                               atomic_wr(wr)->rkey);
2022                                 wqe += sizeof (struct mthca_raddr_seg);
2023
2024                                 set_atomic_seg(wqe, atomic_wr(wr));
2025                                 wqe  += sizeof (struct mthca_atomic_seg);
2026                                 size += (sizeof (struct mthca_raddr_seg) +
2027                                          sizeof (struct mthca_atomic_seg)) / 16;
2028                                 break;
2029
2030                         case IB_WR_RDMA_READ:
2031                         case IB_WR_RDMA_WRITE:
2032                         case IB_WR_RDMA_WRITE_WITH_IMM:
2033                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
2034                                               rdma_wr(wr)->rkey);
2035                                 wqe  += sizeof (struct mthca_raddr_seg);
2036                                 size += sizeof (struct mthca_raddr_seg) / 16;
2037                                 break;
2038
2039                         default:
2040                                 /* No extra segments required for sends */
2041                                 break;
2042                         }
2043
2044                         break;
2045
2046                 case UC:
2047                         switch (wr->opcode) {
2048                         case IB_WR_RDMA_WRITE:
2049                         case IB_WR_RDMA_WRITE_WITH_IMM:
2050                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
2051                                               rdma_wr(wr)->rkey);
2052                                 wqe  += sizeof (struct mthca_raddr_seg);
2053                                 size += sizeof (struct mthca_raddr_seg) / 16;
2054                                 break;
2055
2056                         default:
2057                                 /* No extra segments required for sends */
2058                                 break;
2059                         }
2060
2061                         break;
2062
2063                 case UD:
2064                         set_arbel_ud_seg(wqe, ud_wr(wr));
2065                         wqe  += sizeof (struct mthca_arbel_ud_seg);
2066                         size += sizeof (struct mthca_arbel_ud_seg) / 16;
2067                         break;
2068
2069                 case MLX:
2070                         err = build_mlx_header(
2071                                 dev, qp, ind, ud_wr(wr),
2072                                 wqe - sizeof(struct mthca_next_seg), wqe);
2073                         if (err) {
2074                                 *bad_wr = wr;
2075                                 goto out;
2076                         }
2077                         wqe += sizeof (struct mthca_data_seg);
2078                         size += sizeof (struct mthca_data_seg) / 16;
2079                         break;
2080                 }
2081
2082                 if (wr->num_sge > qp->sq.max_gs) {
2083                         mthca_err(dev, "too many gathers\n");
2084                         err = -EINVAL;
2085                         *bad_wr = wr;
2086                         goto out;
2087                 }
2088
2089                 for (i = 0; i < wr->num_sge; ++i) {
2090                         mthca_set_data_seg(wqe, wr->sg_list + i);
2091                         wqe  += sizeof (struct mthca_data_seg);
2092                         size += sizeof (struct mthca_data_seg) / 16;
2093                 }
2094
2095                 /* Add one more inline data segment for ICRC */
2096                 if (qp->transport == MLX) {
2097                         ((struct mthca_data_seg *) wqe)->byte_count =
2098                                 cpu_to_be32((1 << 31) | 4);
2099                         ((u32 *) wqe)[1] = 0;
2100                         wqe += sizeof (struct mthca_data_seg);
2101                         size += sizeof (struct mthca_data_seg) / 16;
2102                 }
2103
2104                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
2105
2106                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
2107                         mthca_err(dev, "opcode invalid\n");
2108                         err = -EINVAL;
2109                         *bad_wr = wr;
2110                         goto out;
2111                 }
2112
2113                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
2114                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
2115                                      qp->send_wqe_offset) |
2116                                     mthca_opcode[wr->opcode]);
2117                 wmb();
2118                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
2119                         cpu_to_be32(MTHCA_NEXT_DBD | size |
2120                                     ((wr->send_flags & IB_SEND_FENCE) ?
2121                                      MTHCA_NEXT_FENCE : 0));
2122
2123                 if (!nreq) {
2124                         size0 = size;
2125                         op0   = mthca_opcode[wr->opcode];
2126                         f0    = wr->send_flags & IB_SEND_FENCE ?
2127                                 MTHCA_SEND_DOORBELL_FENCE : 0;
2128                 }
2129
2130                 ++ind;
2131                 if (unlikely(ind >= qp->sq.max))
2132                         ind -= qp->sq.max;
2133         }
2134
2135 out:
2136         if (likely(nreq)) {
2137                 dbhi = (nreq << 24) | ((qp->sq.head & 0xffff) << 8) | f0 | op0;
2138
2139                 qp->sq.head += nreq;
2140
2141                 /*
2142                  * Make sure that descriptors are written before
2143                  * doorbell record.
2144                  */
2145                 wmb();
2146                 *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
2147
2148                 /*
2149                  * Make sure doorbell record is written before we
2150                  * write MMIO send doorbell.
2151                  */
2152                 wmb();
2153
2154                 mthca_write64(dbhi, (qp->qpn << 8) | size0, dev->kar + MTHCA_SEND_DOORBELL,
2155                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
2156         }
2157
2158         spin_unlock_irqrestore(&qp->sq.lock, flags);
2159         return err;
2160 }
2161
2162 int mthca_arbel_post_receive(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
2163                              const struct ib_recv_wr **bad_wr)
2164 {
2165         struct mthca_dev *dev = to_mdev(ibqp->device);
2166         struct mthca_qp *qp = to_mqp(ibqp);
2167         unsigned long flags;
2168         int err = 0;
2169         int nreq;
2170         int ind;
2171         int i;
2172         void *wqe;
2173
2174         spin_lock_irqsave(&qp->rq.lock, flags);
2175
2176         /* XXX check that state is OK to post receive */
2177
2178         ind = qp->rq.head & (qp->rq.max - 1);
2179
2180         for (nreq = 0; wr; ++nreq, wr = wr->next) {
2181                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
2182                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
2183                                         " %d max, %d nreq)\n", qp->qpn,
2184                                         qp->rq.head, qp->rq.tail,
2185                                         qp->rq.max, nreq);
2186                         err = -ENOMEM;
2187                         *bad_wr = wr;
2188                         goto out;
2189                 }
2190
2191                 wqe = get_recv_wqe(qp, ind);
2192
2193                 ((struct mthca_next_seg *) wqe)->flags = 0;
2194
2195                 wqe += sizeof (struct mthca_next_seg);
2196
2197                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
2198                         err = -EINVAL;
2199                         *bad_wr = wr;
2200                         goto out;
2201                 }
2202
2203                 for (i = 0; i < wr->num_sge; ++i) {
2204                         mthca_set_data_seg(wqe, wr->sg_list + i);
2205                         wqe += sizeof (struct mthca_data_seg);
2206                 }
2207
2208                 if (i < qp->rq.max_gs)
2209                         mthca_set_data_seg_inval(wqe);
2210
2211                 qp->wrid[ind] = wr->wr_id;
2212
2213                 ++ind;
2214                 if (unlikely(ind >= qp->rq.max))
2215                         ind -= qp->rq.max;
2216         }
2217 out:
2218         if (likely(nreq)) {
2219                 qp->rq.head += nreq;
2220
2221                 /*
2222                  * Make sure that descriptors are written before
2223                  * doorbell record.
2224                  */
2225                 wmb();
2226                 *qp->rq.db = cpu_to_be32(qp->rq.head & 0xffff);
2227         }
2228
2229         spin_unlock_irqrestore(&qp->rq.lock, flags);
2230         return err;
2231 }
2232
2233 void mthca_free_err_wqe(struct mthca_dev *dev, struct mthca_qp *qp, int is_send,
2234                         int index, int *dbd, __be32 *new_wqe)
2235 {
2236         struct mthca_next_seg *next;
2237
2238         /*
2239          * For SRQs, all receive WQEs generate a CQE, so we're always
2240          * at the end of the doorbell chain.
2241          */
2242         if (qp->ibqp.srq && !is_send) {
2243                 *new_wqe = 0;
2244                 return;
2245         }
2246
2247         if (is_send)
2248                 next = get_send_wqe(qp, index);
2249         else
2250                 next = get_recv_wqe(qp, index);
2251
2252         *dbd = !!(next->ee_nds & cpu_to_be32(MTHCA_NEXT_DBD));
2253         if (next->ee_nds & cpu_to_be32(0x3f))
2254                 *new_wqe = (next->nda_op & cpu_to_be32(~0x3f)) |
2255                         (next->ee_nds & cpu_to_be32(0x3f));
2256         else
2257                 *new_wqe = 0;
2258 }
2259
2260 int mthca_init_qp_table(struct mthca_dev *dev)
2261 {
2262         int err;
2263         int i;
2264
2265         spin_lock_init(&dev->qp_table.lock);
2266
2267         /*
2268          * We reserve 2 extra QPs per port for the special QPs.  The
2269          * special QP for port 1 has to be even, so round up.
2270          */
2271         dev->qp_table.sqp_start = (dev->limits.reserved_qps + 1) & ~1UL;
2272         err = mthca_alloc_init(&dev->qp_table.alloc,
2273                                dev->limits.num_qps,
2274                                (1 << 24) - 1,
2275                                dev->qp_table.sqp_start +
2276                                MTHCA_MAX_PORTS * 2);
2277         if (err)
2278                 return err;
2279
2280         err = mthca_array_init(&dev->qp_table.qp,
2281                                dev->limits.num_qps);
2282         if (err) {
2283                 mthca_alloc_cleanup(&dev->qp_table.alloc);
2284                 return err;
2285         }
2286
2287         for (i = 0; i < 2; ++i) {
2288                 err = mthca_CONF_SPECIAL_QP(dev, i ? IB_QPT_GSI : IB_QPT_SMI,
2289                                     dev->qp_table.sqp_start + i * 2);
2290                 if (err) {
2291                         mthca_warn(dev, "CONF_SPECIAL_QP returned "
2292                                    "%d, aborting.\n", err);
2293                         goto err_out;
2294                 }
2295         }
2296         return 0;
2297
2298  err_out:
2299         for (i = 0; i < 2; ++i)
2300                 mthca_CONF_SPECIAL_QP(dev, i, 0);
2301
2302         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2303         mthca_alloc_cleanup(&dev->qp_table.alloc);
2304
2305         return err;
2306 }
2307
2308 void mthca_cleanup_qp_table(struct mthca_dev *dev)
2309 {
2310         int i;
2311
2312         for (i = 0; i < 2; ++i)
2313                 mthca_CONF_SPECIAL_QP(dev, i, 0);
2314
2315         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2316         mthca_alloc_cleanup(&dev->qp_table.alloc);
2317 }