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(to_msqp(qp), 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         mutex_lock(&qp->mutex);
 867         if (attr_mask & IB_QP_CUR_STATE) {
 868                 cur_state = attr->cur_qp_state;
 869         } else {
 870                 spin_lock_irq(&qp->sq.lock);
 871                 spin_lock(&qp->rq.lock);
 872                 cur_state = qp->state;
 873                 spin_unlock(&qp->rq.lock);
 874                 spin_unlock_irq(&qp->sq.lock);
 875         }
 876
 877         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
 878
 879         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
 880                                 attr_mask)) {
 881                 mthca_dbg(dev, "Bad QP transition (transport %d) "
 882                           "%d->%d with attr 0x%08x\n",
 883                           qp->transport, cur_state, new_state,
 884                           attr_mask);
 885                 goto out;
 886         }
 887
 888         if ((attr_mask & IB_QP_PKEY_INDEX) &&
 889              attr->pkey_index >= dev->limits.pkey_table_len) {
 890                 mthca_dbg(dev, "P_Key index (%u) too large. max is %d\n",
 891                           attr->pkey_index, dev->limits.pkey_table_len-1);
 892                 goto out;
 893         }
 894
 895         if ((attr_mask & IB_QP_PORT) &&
 896             (attr->port_num == 0 || attr->port_num > dev->limits.num_ports)) {
 897                 mthca_dbg(dev, "Port number (%u) is invalid\n", attr->port_num);
 898                 goto out;
 899         }
 900
 901         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
 902             attr->max_rd_atomic > dev->limits.max_qp_init_rdma) {
 903                 mthca_dbg(dev, "Max rdma_atomic as initiator %u too large (max is %d)\n",
 904                           attr->max_rd_atomic, dev->limits.max_qp_init_rdma);
 905                 goto out;
 906         }
 907
 908         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
 909             attr->max_dest_rd_atomic > 1 << dev->qp_table.rdb_shift) {
 910                 mthca_dbg(dev, "Max rdma_atomic as responder %u too large (max %d)\n",
 911                           attr->max_dest_rd_atomic, 1 << dev->qp_table.rdb_shift);
 912                 goto out;
 913         }
 914
 915         if (cur_state == new_state && cur_state == IB_QPS_RESET) {
 916                 err = 0;
 917                 goto out;
 918         }
 919
 920         err = __mthca_modify_qp(ibqp, attr, attr_mask, cur_state, new_state,
 921                                 udata);
 922
 923 out:
 924         mutex_unlock(&qp->mutex);
 925         return err;
 926 }
 927
 928 static int mthca_max_data_size(struct mthca_dev *dev, struct mthca_qp *qp, int desc_sz)
 929 {
 930         /*
 931          * Calculate the maximum size of WQE s/g segments, excluding
 932          * the next segment and other non-data segments.
 933          */
 934         int max_data_size = desc_sz - sizeof (struct mthca_next_seg);
 935
 936         switch (qp->transport) {
 937         case MLX:
 938                 max_data_size -= 2 * sizeof (struct mthca_data_seg);
 939                 break;
 940
 941         case UD:
 942                 if (mthca_is_memfree(dev))
 943                         max_data_size -= sizeof (struct mthca_arbel_ud_seg);
 944                 else
 945                         max_data_size -= sizeof (struct mthca_tavor_ud_seg);
 946                 break;
 947
 948         default:
 949                 max_data_size -= sizeof (struct mthca_raddr_seg);
 950                 break;
 951         }
 952
 953         return max_data_size;
 954 }
 955
 956 static inline int mthca_max_inline_data(struct mthca_pd *pd, int max_data_size)
 957 {
 958         /* We don't support inline data for kernel QPs (yet). */
 959         return pd->ibpd.uobject ? max_data_size - MTHCA_INLINE_HEADER_SIZE : 0;
 960 }
 961
 962 static void mthca_adjust_qp_caps(struct mthca_dev *dev,
 963                                  struct mthca_pd *pd,
 964                                  struct mthca_qp *qp)
 965 {
 966         int max_data_size = mthca_max_data_size(dev, qp,
 967                                                 min(dev->limits.max_desc_sz,
 968                                                     1 << qp->sq.wqe_shift));
 969
 970         qp->max_inline_data = mthca_max_inline_data(pd, max_data_size);
 971
 972         qp->sq.max_gs = min_t(int, dev->limits.max_sg,
 973                               max_data_size / sizeof (struct mthca_data_seg));
 974         qp->rq.max_gs = min_t(int, dev->limits.max_sg,
 975                                (min(dev->limits.max_desc_sz, 1 << qp->rq.wqe_shift) -
 976                                 sizeof (struct mthca_next_seg)) /
 977                                sizeof (struct mthca_data_seg));
 978 }
 979
 980 /*
 981  * Allocate and register buffer for WQEs.  qp->rq.max, sq.max,
 982  * rq.max_gs and sq.max_gs must all be assigned.
 983  * mthca_alloc_wqe_buf will calculate rq.wqe_shift and
 984  * sq.wqe_shift (as well as send_wqe_offset, is_direct, and
 985  * queue)
 986  */
 987 static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 988                                struct mthca_pd *pd,
 989                                struct mthca_qp *qp,
 990                                struct ib_udata *udata)
 991 {
 992         int size;
 993         int err = -ENOMEM;
 994
 995         size = sizeof (struct mthca_next_seg) +
 996                 qp->rq.max_gs * sizeof (struct mthca_data_seg);
 997
 998         if (size > dev->limits.max_desc_sz)
 999                 return -EINVAL;
1000
1001         for (qp->rq.wqe_shift = 6; 1 << qp->rq.wqe_shift < size;
1002              qp->rq.wqe_shift++)
1003                 ; /* nothing */
1004
1005         size = qp->sq.max_gs * sizeof (struct mthca_data_seg);
1006         switch (qp->transport) {
1007         case MLX:
1008                 size += 2 * sizeof (struct mthca_data_seg);
1009                 break;
1010
1011         case UD:
1012                 size += mthca_is_memfree(dev) ?
1013                         sizeof (struct mthca_arbel_ud_seg) :
1014                         sizeof (struct mthca_tavor_ud_seg);
1015                 break;
1016
1017         case UC:
1018                 size += sizeof (struct mthca_raddr_seg);
1019                 break;
1020
1021         case RC:
1022                 size += sizeof (struct mthca_raddr_seg);
1023                 /*
1024                  * An atomic op will require an atomic segment, a
1025                  * remote address segment and one scatter entry.
1026                  */
1027                 size = max_t(int, size,
1028                              sizeof (struct mthca_atomic_seg) +
1029                              sizeof (struct mthca_raddr_seg) +
1030                              sizeof (struct mthca_data_seg));
1031                 break;
1032
1033         default:
1034                 break;
1035         }
1036
1037         /* Make sure that we have enough space for a bind request */
1038         size = max_t(int, size, sizeof (struct mthca_bind_seg));
1039
1040         size += sizeof (struct mthca_next_seg);
1041
1042         if (size > dev->limits.max_desc_sz)
1043                 return -EINVAL;
1044
1045         for (qp->sq.wqe_shift = 6; 1 << qp->sq.wqe_shift < size;
1046              qp->sq.wqe_shift++)
1047                 ; /* nothing */
1048
1049         qp->send_wqe_offset = ALIGN(qp->rq.max << qp->rq.wqe_shift,
1050                                     1 << qp->sq.wqe_shift);
1051
1052         /*
1053          * If this is a userspace QP, we don't actually have to
1054          * allocate anything.  All we need is to calculate the WQE
1055          * sizes and the send_wqe_offset, so we're done now.
1056          */
1057         if (udata)
1058                 return 0;
1059
1060         size = PAGE_ALIGN(qp->send_wqe_offset +
1061                           (qp->sq.max << qp->sq.wqe_shift));
1062
1063         qp->wrid = kmalloc_array(qp->rq.max + qp->sq.max, sizeof(u64),
1064                                  GFP_KERNEL);
1065         if (!qp->wrid)
1066                 goto err_out;
1067
1068         err = mthca_buf_alloc(dev, size, MTHCA_MAX_DIRECT_QP_SIZE,
1069                               &qp->queue, &qp->is_direct, pd, 0, &qp->mr);
1070         if (err)
1071                 goto err_out;
1072
1073         return 0;
1074
1075 err_out:
1076         kfree(qp->wrid);
1077         return err;
1078 }
1079
1080 static void mthca_free_wqe_buf(struct mthca_dev *dev,
1081                                struct mthca_qp *qp)
1082 {
1083         mthca_buf_free(dev, PAGE_ALIGN(qp->send_wqe_offset +
1084                                        (qp->sq.max << qp->sq.wqe_shift)),
1085                        &qp->queue, qp->is_direct, &qp->mr);
1086         kfree(qp->wrid);
1087 }
1088
1089 static int mthca_map_memfree(struct mthca_dev *dev,
1090                              struct mthca_qp *qp)
1091 {
1092         int ret;
1093
1094         if (mthca_is_memfree(dev)) {
1095                 ret = mthca_table_get(dev, dev->qp_table.qp_table, qp->qpn);
1096                 if (ret)
1097                         return ret;
1098
1099                 ret = mthca_table_get(dev, dev->qp_table.eqp_table, qp->qpn);
1100                 if (ret)
1101                         goto err_qpc;
1102
1103                 ret = mthca_table_get(dev, dev->qp_table.rdb_table,
1104                                       qp->qpn << dev->qp_table.rdb_shift);
1105                 if (ret)
1106                         goto err_eqpc;
1107
1108         }
1109
1110         return 0;
1111
1112 err_eqpc:
1113         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1114
1115 err_qpc:
1116         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1117
1118         return ret;
1119 }
1120
1121 static void mthca_unmap_memfree(struct mthca_dev *dev,
1122                                 struct mthca_qp *qp)
1123 {
1124         mthca_table_put(dev, dev->qp_table.rdb_table,
1125                         qp->qpn << dev->qp_table.rdb_shift);
1126         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1127         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1128 }
1129
1130 static int mthca_alloc_memfree(struct mthca_dev *dev,
1131                                struct mthca_qp *qp)
1132 {
1133         if (mthca_is_memfree(dev)) {
1134                 qp->rq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_RQ,
1135                                                  qp->qpn, &qp->rq.db);
1136                 if (qp->rq.db_index < 0)
1137                         return -ENOMEM;
1138
1139                 qp->sq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SQ,
1140                                                  qp->qpn, &qp->sq.db);
1141                 if (qp->sq.db_index < 0) {
1142                         mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1143                         return -ENOMEM;
1144                 }
1145         }
1146
1147         return 0;
1148 }
1149
1150 static void mthca_free_memfree(struct mthca_dev *dev,
1151                                struct mthca_qp *qp)
1152 {
1153         if (mthca_is_memfree(dev)) {
1154                 mthca_free_db(dev, MTHCA_DB_TYPE_SQ, qp->sq.db_index);
1155                 mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1156         }
1157 }
1158
1159 static int mthca_alloc_qp_common(struct mthca_dev *dev,
1160                                  struct mthca_pd *pd,
1161                                  struct mthca_cq *send_cq,
1162                                  struct mthca_cq *recv_cq,
1163                                  enum ib_sig_type send_policy,
1164                                  struct mthca_qp *qp,
1165                                  struct ib_udata *udata)
1166 {
1167         int ret;
1168         int i;
1169         struct mthca_next_seg *next;
1170
1171         qp->refcount = 1;
1172         init_waitqueue_head(&qp->wait);
1173         mutex_init(&qp->mutex);
1174         qp->state        = IB_QPS_RESET;
1175         qp->atomic_rd_en = 0;
1176         qp->resp_depth   = 0;
1177         qp->sq_policy    = send_policy;
1178         mthca_wq_reset(&qp->sq);
1179         mthca_wq_reset(&qp->rq);
1180
1181         spin_lock_init(&qp->sq.lock);
1182         spin_lock_init(&qp->rq.lock);
1183
1184         ret = mthca_map_memfree(dev, qp);
1185         if (ret)
1186                 return ret;
1187
1188         ret = mthca_alloc_wqe_buf(dev, pd, qp, udata);
1189         if (ret) {
1190                 mthca_unmap_memfree(dev, qp);
1191                 return ret;
1192         }
1193
1194         mthca_adjust_qp_caps(dev, pd, qp);
1195
1196         /*
1197          * If this is a userspace QP, we're done now.  The doorbells
1198          * will be allocated and buffers will be initialized in
1199          * userspace.
1200          */
1201         if (udata)
1202                 return 0;
1203
1204         ret = mthca_alloc_memfree(dev, qp);
1205         if (ret) {
1206                 mthca_free_wqe_buf(dev, qp);
1207                 mthca_unmap_memfree(dev, qp);
1208                 return ret;
1209         }
1210
1211         if (mthca_is_memfree(dev)) {
1212                 struct mthca_data_seg *scatter;
1213                 int size = (sizeof (struct mthca_next_seg) +
1214                             qp->rq.max_gs * sizeof (struct mthca_data_seg)) / 16;
1215
1216                 for (i = 0; i < qp->rq.max; ++i) {
1217                         next = get_recv_wqe(qp, i);
1218                         next->nda_op = cpu_to_be32(((i + 1) & (qp->rq.max - 1)) <<
1219                                                    qp->rq.wqe_shift);
1220                         next->ee_nds = cpu_to_be32(size);
1221
1222                         for (scatter = (void *) (next + 1);
1223                              (void *) scatter < (void *) next + (1 << qp->rq.wqe_shift);
1224                              ++scatter)
1225                                 scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
1226                 }
1227
1228                 for (i = 0; i < qp->sq.max; ++i) {
1229                         next = get_send_wqe(qp, i);
1230                         next->nda_op = cpu_to_be32((((i + 1) & (qp->sq.max - 1)) <<
1231                                                     qp->sq.wqe_shift) +
1232                                                    qp->send_wqe_offset);
1233                 }
1234         } else {
1235                 for (i = 0; i < qp->rq.max; ++i) {
1236                         next = get_recv_wqe(qp, i);
1237                         next->nda_op = htonl((((i + 1) % qp->rq.max) <<
1238                                               qp->rq.wqe_shift) | 1);
1239                 }
1240
1241         }
1242
1243         qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
1244         qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
1245
1246         return 0;
1247 }
1248
1249 static int mthca_set_qp_size(struct mthca_dev *dev, struct ib_qp_cap *cap,
1250                              struct mthca_pd *pd, struct mthca_qp *qp)
1251 {
1252         int max_data_size = mthca_max_data_size(dev, qp, dev->limits.max_desc_sz);
1253
1254         /* Sanity check QP size before proceeding */
1255         if (cap->max_send_wr     > dev->limits.max_wqes ||
1256             cap->max_recv_wr     > dev->limits.max_wqes ||
1257             cap->max_send_sge    > dev->limits.max_sg   ||
1258             cap->max_recv_sge    > dev->limits.max_sg   ||
1259             cap->max_inline_data > mthca_max_inline_data(pd, max_data_size))
1260                 return -EINVAL;
1261
1262         /*
1263          * For MLX transport we need 2 extra send gather entries:
1264          * one for the header and one for the checksum at the end
1265          */
1266         if (qp->transport == MLX && cap->max_send_sge + 2 > dev->limits.max_sg)
1267                 return -EINVAL;
1268
1269         if (mthca_is_memfree(dev)) {
1270                 qp->rq.max = cap->max_recv_wr ?
1271                         roundup_pow_of_two(cap->max_recv_wr) : 0;
1272                 qp->sq.max = cap->max_send_wr ?
1273                         roundup_pow_of_two(cap->max_send_wr) : 0;
1274         } else {
1275                 qp->rq.max = cap->max_recv_wr;
1276                 qp->sq.max = cap->max_send_wr;
1277         }
1278
1279         qp->rq.max_gs = cap->max_recv_sge;
1280         qp->sq.max_gs = max_t(int, cap->max_send_sge,
1281                               ALIGN(cap->max_inline_data + MTHCA_INLINE_HEADER_SIZE,
1282                                     MTHCA_INLINE_CHUNK_SIZE) /
1283                               sizeof (struct mthca_data_seg));
1284
1285         return 0;
1286 }
1287
1288 int mthca_alloc_qp(struct mthca_dev *dev,
1289                    struct mthca_pd *pd,
1290                    struct mthca_cq *send_cq,
1291                    struct mthca_cq *recv_cq,
1292                    enum ib_qp_type type,
1293                    enum ib_sig_type send_policy,
1294                    struct ib_qp_cap *cap,
1295                    struct mthca_qp *qp,
1296                    struct ib_udata *udata)
1297 {
1298         int err;
1299
1300         switch (type) {
1301         case IB_QPT_RC: qp->transport = RC; break;
1302         case IB_QPT_UC: qp->transport = UC; break;
1303         case IB_QPT_UD: qp->transport = UD; break;
1304         default: return -EINVAL;
1305         }
1306
1307         err = mthca_set_qp_size(dev, cap, pd, qp);
1308         if (err)
1309                 return err;
1310
1311         qp->qpn = mthca_alloc(&dev->qp_table.alloc);
1312         if (qp->qpn == -1)
1313                 return -ENOMEM;
1314
1315         /* initialize port to zero for error-catching. */
1316         qp->port = 0;
1317
1318         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1319                                     send_policy, qp, udata);
1320         if (err) {
1321                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1322                 return err;
1323         }
1324
1325         spin_lock_irq(&dev->qp_table.lock);
1326         mthca_array_set(&dev->qp_table.qp,
1327                         qp->qpn & (dev->limits.num_qps - 1), qp);
1328         spin_unlock_irq(&dev->qp_table.lock);
1329
1330         return 0;
1331 }
1332
1333 static void mthca_lock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq)
1334         __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
1335 {
1336         if (send_cq == recv_cq) {
1337                 spin_lock_irq(&send_cq->lock);
1338                 __acquire(&recv_cq->lock);
1339         } else if (send_cq->cqn < recv_cq->cqn) {
1340                 spin_lock_irq(&send_cq->lock);
1341                 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
1342         } else {
1343                 spin_lock_irq(&recv_cq->lock);
1344                 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
1345         }
1346 }
1347
1348 static void mthca_unlock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq)
1349         __releases(&send_cq->lock) __releases(&recv_cq->lock)
1350 {
1351         if (send_cq == recv_cq) {
1352                 __release(&recv_cq->lock);
1353                 spin_unlock_irq(&send_cq->lock);
1354         } else if (send_cq->cqn < recv_cq->cqn) {
1355                 spin_unlock(&recv_cq->lock);
1356                 spin_unlock_irq(&send_cq->lock);
1357         } else {
1358                 spin_unlock(&send_cq->lock);
1359                 spin_unlock_irq(&recv_cq->lock);
1360         }
1361 }
1362
1363 int mthca_alloc_sqp(struct mthca_dev *dev,
1364                     struct mthca_pd *pd,
1365                     struct mthca_cq *send_cq,
1366                     struct mthca_cq *recv_cq,
1367                     enum ib_sig_type send_policy,
1368                     struct ib_qp_cap *cap,
1369                     int qpn,
1370                     int port,
1371                     struct mthca_sqp *sqp,
1372                     struct ib_udata *udata)
1373 {
1374         u32 mqpn = qpn * 2 + dev->qp_table.sqp_start + port - 1;
1375         int err;
1376
1377         sqp->qp.transport = MLX;
1378         err = mthca_set_qp_size(dev, cap, pd, &sqp->qp);
1379         if (err)
1380                 return err;
1381
1382         sqp->header_buf_size = sqp->qp.sq.max * MTHCA_UD_HEADER_SIZE;
1383         sqp->header_buf = dma_alloc_coherent(&dev->pdev->dev, sqp->header_buf_size,
1384                                              &sqp->header_dma, GFP_KERNEL);
1385         if (!sqp->header_buf)
1386                 return -ENOMEM;
1387
1388         spin_lock_irq(&dev->qp_table.lock);
1389         if (mthca_array_get(&dev->qp_table.qp, mqpn))
1390                 err = -EBUSY;
1391         else
1392                 mthca_array_set(&dev->qp_table.qp, mqpn, sqp);
1393         spin_unlock_irq(&dev->qp_table.lock);
1394
1395         if (err)
1396                 goto err_out;
1397
1398         sqp->qp.port      = port;
1399         sqp->qp.qpn       = mqpn;
1400         sqp->qp.transport = MLX;
1401
1402         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1403                                     send_policy, &sqp->qp, udata);
1404         if (err)
1405                 goto err_out_free;
1406
1407         atomic_inc(&pd->sqp_count);
1408
1409         return 0;
1410
1411  err_out_free:
1412         /*
1413          * Lock CQs here, so that CQ polling code can do QP lookup
1414          * without taking a lock.
1415          */
1416         mthca_lock_cqs(send_cq, recv_cq);
1417
1418         spin_lock(&dev->qp_table.lock);
1419         mthca_array_clear(&dev->qp_table.qp, mqpn);
1420         spin_unlock(&dev->qp_table.lock);
1421
1422         mthca_unlock_cqs(send_cq, recv_cq);
1423
1424  err_out:
1425         dma_free_coherent(&dev->pdev->dev, sqp->header_buf_size,
1426                           sqp->header_buf, sqp->header_dma);
1427
1428         return err;
1429 }
1430
1431 static inline int get_qp_refcount(struct mthca_dev *dev, struct mthca_qp *qp)
1432 {
1433         int c;
1434
1435         spin_lock_irq(&dev->qp_table.lock);
1436         c = qp->refcount;
1437         spin_unlock_irq(&dev->qp_table.lock);
1438
1439         return c;
1440 }
1441
1442 void mthca_free_qp(struct mthca_dev *dev,
1443                    struct mthca_qp *qp)
1444 {
1445         struct mthca_cq *send_cq;
1446         struct mthca_cq *recv_cq;
1447
1448         send_cq = to_mcq(qp->ibqp.send_cq);
1449         recv_cq = to_mcq(qp->ibqp.recv_cq);
1450
1451         /*
1452          * Lock CQs here, so that CQ polling code can do QP lookup
1453          * without taking a lock.
1454          */
1455         mthca_lock_cqs(send_cq, recv_cq);
1456
1457         spin_lock(&dev->qp_table.lock);
1458         mthca_array_clear(&dev->qp_table.qp,
1459                           qp->qpn & (dev->limits.num_qps - 1));
1460         --qp->refcount;
1461         spin_unlock(&dev->qp_table.lock);
1462
1463         mthca_unlock_cqs(send_cq, recv_cq);
1464
1465         wait_event(qp->wait, !get_qp_refcount(dev, qp));
1466
1467         if (qp->state != IB_QPS_RESET)
1468                 mthca_MODIFY_QP(dev, qp->state, IB_QPS_RESET, qp->qpn, 0,
1469                                 NULL, 0);
1470
1471         /*
1472          * If this is a userspace QP, the buffers, MR, CQs and so on
1473          * will be cleaned up in userspace, so all we have to do is
1474          * unref the mem-free tables and free the QPN in our table.
1475          */
1476         if (!qp->ibqp.uobject) {
1477                 mthca_cq_clean(dev, recv_cq, qp->qpn,
1478                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
1479                 if (send_cq != recv_cq)
1480                         mthca_cq_clean(dev, send_cq, qp->qpn, NULL);
1481
1482                 mthca_free_memfree(dev, qp);
1483                 mthca_free_wqe_buf(dev, qp);
1484         }
1485
1486         mthca_unmap_memfree(dev, qp);
1487
1488         if (is_sqp(dev, qp)) {
1489                 atomic_dec(&(to_mpd(qp->ibqp.pd)->sqp_count));
1490                 dma_free_coherent(&dev->pdev->dev,
1491                                   to_msqp(qp)->header_buf_size,
1492                                   to_msqp(qp)->header_buf,
1493                                   to_msqp(qp)->header_dma);
1494         } else
1495                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1496 }
1497
1498 /* Create UD header for an MLX send and build a data segment for it */
1499 static int build_mlx_header(struct mthca_dev *dev, struct mthca_sqp *sqp,
1500                             int ind, const struct ib_ud_wr *wr,
1501                             struct mthca_mlx_seg *mlx,
1502                             struct mthca_data_seg *data)
1503 {
1504         int header_size;
1505         int err;
1506         u16 pkey;
1507
1508         ib_ud_header_init(256, /* assume a MAD */ 1, 0, 0,
1509                           mthca_ah_grh_present(to_mah(wr->ah)), 0, 0, 0,
1510                           &sqp->ud_header);
1511
1512         err = mthca_read_ah(dev, to_mah(wr->ah), &sqp->ud_header);
1513         if (err)
1514                 return err;
1515         mlx->flags &= ~cpu_to_be32(MTHCA_NEXT_SOLICIT | 1);
1516         mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MTHCA_MLX_VL15 : 0) |
1517                                   (sqp->ud_header.lrh.destination_lid ==
1518                                    IB_LID_PERMISSIVE ? MTHCA_MLX_SLR : 0) |
1519                                   (sqp->ud_header.lrh.service_level << 8));
1520         mlx->rlid = sqp->ud_header.lrh.destination_lid;
1521         mlx->vcrc = 0;
1522
1523         switch (wr->wr.opcode) {
1524         case IB_WR_SEND:
1525                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1526                 sqp->ud_header.immediate_present = 0;
1527                 break;
1528         case IB_WR_SEND_WITH_IMM:
1529                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1530                 sqp->ud_header.immediate_present = 1;
1531                 sqp->ud_header.immediate_data = wr->wr.ex.imm_data;
1532                 break;
1533         default:
1534                 return -EINVAL;
1535         }
1536
1537         sqp->ud_header.lrh.virtual_lane    = !sqp->qp.ibqp.qp_num ? 15 : 0;
1538         if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1539                 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1540         sqp->ud_header.bth.solicited_event = !!(wr->wr.send_flags & IB_SEND_SOLICITED);
1541         if (!sqp->qp.ibqp.qp_num)
1542                 ib_get_cached_pkey(&dev->ib_dev, sqp->qp.port,
1543                                    sqp->pkey_index, &pkey);
1544         else
1545                 ib_get_cached_pkey(&dev->ib_dev, sqp->qp.port,
1546                                    wr->pkey_index, &pkey);
1547         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1548         sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->remote_qpn);
1549         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1550         sqp->ud_header.deth.qkey = cpu_to_be32(wr->remote_qkey & 0x80000000 ?
1551                                                sqp->qkey : wr->remote_qkey);
1552         sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1553
1554         header_size = ib_ud_header_pack(&sqp->ud_header,
1555                                         sqp->header_buf +
1556                                         ind * MTHCA_UD_HEADER_SIZE);
1557
1558         data->byte_count = cpu_to_be32(header_size);
1559         data->lkey       = cpu_to_be32(to_mpd(sqp->qp.ibqp.pd)->ntmr.ibmr.lkey);
1560         data->addr       = cpu_to_be64(sqp->header_dma +
1561                                        ind * MTHCA_UD_HEADER_SIZE);
1562
1563         return 0;
1564 }
1565
1566 static inline int mthca_wq_overflow(struct mthca_wq *wq, int nreq,
1567                                     struct ib_cq *ib_cq)
1568 {
1569         unsigned cur;
1570         struct mthca_cq *cq;
1571
1572         cur = wq->head - wq->tail;
1573         if (likely(cur + nreq < wq->max))
1574                 return 0;
1575
1576         cq = to_mcq(ib_cq);
1577         spin_lock(&cq->lock);
1578         cur = wq->head - wq->tail;
1579         spin_unlock(&cq->lock);
1580
1581         return cur + nreq >= wq->max;
1582 }
1583
1584 static __always_inline void set_raddr_seg(struct mthca_raddr_seg *rseg,
1585                                           u64 remote_addr, u32 rkey)
1586 {
1587         rseg->raddr    = cpu_to_be64(remote_addr);
1588         rseg->rkey     = cpu_to_be32(rkey);
1589         rseg->reserved = 0;
1590 }
1591
1592 static __always_inline void set_atomic_seg(struct mthca_atomic_seg *aseg,
1593                                            const struct ib_atomic_wr *wr)
1594 {
1595         if (wr->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1596                 aseg->swap_add = cpu_to_be64(wr->swap);
1597                 aseg->compare  = cpu_to_be64(wr->compare_add);
1598         } else {
1599                 aseg->swap_add = cpu_to_be64(wr->compare_add);
1600                 aseg->compare  = 0;
1601         }
1602
1603 }
1604
1605 static void set_tavor_ud_seg(struct mthca_tavor_ud_seg *useg,
1606                              const struct ib_ud_wr *wr)
1607 {
1608         useg->lkey    = cpu_to_be32(to_mah(wr->ah)->key);
1609         useg->av_addr = cpu_to_be64(to_mah(wr->ah)->avdma);
1610         useg->dqpn    = cpu_to_be32(wr->remote_qpn);
1611         useg->qkey    = cpu_to_be32(wr->remote_qkey);
1612
1613 }
1614
1615 static void set_arbel_ud_seg(struct mthca_arbel_ud_seg *useg,
1616                              const struct ib_ud_wr *wr)
1617 {
1618         memcpy(useg->av, to_mah(wr->ah)->av, MTHCA_AV_SIZE);
1619         useg->dqpn = cpu_to_be32(wr->remote_qpn);
1620         useg->qkey = cpu_to_be32(wr->remote_qkey);
1621 }
1622
1623 int mthca_tavor_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
1624                           const struct ib_send_wr **bad_wr)
1625 {
1626         struct mthca_dev *dev = to_mdev(ibqp->device);
1627         struct mthca_qp *qp = to_mqp(ibqp);
1628         void *wqe;
1629         void *prev_wqe;
1630         unsigned long flags;
1631         int err = 0;
1632         int nreq;
1633         int i;
1634         int size;
1635         /*
1636          * f0 and size0 are only used if nreq != 0, and they will
1637          * always be initialized the first time through the main loop
1638          * before nreq is incremented.  So nreq cannot become non-zero
1639          * without initializing f0 and size0, and they are in fact
1640          * never used uninitialized.
1641          */
1642         int uninitialized_var(size0);
1643         u32 uninitialized_var(f0);
1644         int ind;
1645         u8 op0 = 0;
1646
1647         spin_lock_irqsave(&qp->sq.lock, flags);
1648
1649         /* XXX check that state is OK to post send */
1650
1651         ind = qp->sq.next_ind;
1652
1653         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1654                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1655                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1656                                         " %d max, %d nreq)\n", qp->qpn,
1657                                         qp->sq.head, qp->sq.tail,
1658                                         qp->sq.max, nreq);
1659                         err = -ENOMEM;
1660                         *bad_wr = wr;
1661                         goto out;
1662                 }
1663
1664                 wqe = get_send_wqe(qp, ind);
1665                 prev_wqe = qp->sq.last;
1666                 qp->sq.last = wqe;
1667
1668                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
1669                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
1670                 ((struct mthca_next_seg *) wqe)->flags =
1671                         ((wr->send_flags & IB_SEND_SIGNALED) ?
1672                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
1673                         ((wr->send_flags & IB_SEND_SOLICITED) ?
1674                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
1675                         cpu_to_be32(1);
1676                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1677                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1678                         ((struct mthca_next_seg *) wqe)->imm = wr->ex.imm_data;
1679
1680                 wqe += sizeof (struct mthca_next_seg);
1681                 size = sizeof (struct mthca_next_seg) / 16;
1682
1683                 switch (qp->transport) {
1684                 case RC:
1685                         switch (wr->opcode) {
1686                         case IB_WR_ATOMIC_CMP_AND_SWP:
1687                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1688                                 set_raddr_seg(wqe, atomic_wr(wr)->remote_addr,
1689                                               atomic_wr(wr)->rkey);
1690                                 wqe += sizeof (struct mthca_raddr_seg);
1691
1692                                 set_atomic_seg(wqe, atomic_wr(wr));
1693                                 wqe += sizeof (struct mthca_atomic_seg);
1694                                 size += (sizeof (struct mthca_raddr_seg) +
1695                                          sizeof (struct mthca_atomic_seg)) / 16;
1696                                 break;
1697
1698                         case IB_WR_RDMA_WRITE:
1699                         case IB_WR_RDMA_WRITE_WITH_IMM:
1700                         case IB_WR_RDMA_READ:
1701                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
1702                                               rdma_wr(wr)->rkey);
1703                                 wqe  += sizeof (struct mthca_raddr_seg);
1704                                 size += sizeof (struct mthca_raddr_seg) / 16;
1705                                 break;
1706
1707                         default:
1708                                 /* No extra segments required for sends */
1709                                 break;
1710                         }
1711
1712                         break;
1713
1714                 case UC:
1715                         switch (wr->opcode) {
1716                         case IB_WR_RDMA_WRITE:
1717                         case IB_WR_RDMA_WRITE_WITH_IMM:
1718                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
1719                                               rdma_wr(wr)->rkey);
1720                                 wqe  += sizeof (struct mthca_raddr_seg);
1721                                 size += sizeof (struct mthca_raddr_seg) / 16;
1722                                 break;
1723
1724                         default:
1725                                 /* No extra segments required for sends */
1726                                 break;
1727                         }
1728
1729                         break;
1730
1731                 case UD:
1732                         set_tavor_ud_seg(wqe, ud_wr(wr));
1733                         wqe  += sizeof (struct mthca_tavor_ud_seg);
1734                         size += sizeof (struct mthca_tavor_ud_seg) / 16;
1735                         break;
1736
1737                 case MLX:
1738                         err = build_mlx_header(dev, to_msqp(qp), ind, ud_wr(wr),
1739                                                wqe - sizeof (struct mthca_next_seg),
1740                                                wqe);
1741                         if (err) {
1742                                 *bad_wr = wr;
1743                                 goto out;
1744                         }
1745                         wqe += sizeof (struct mthca_data_seg);
1746                         size += sizeof (struct mthca_data_seg) / 16;
1747                         break;
1748                 }
1749
1750                 if (wr->num_sge > qp->sq.max_gs) {
1751                         mthca_err(dev, "too many gathers\n");
1752                         err = -EINVAL;
1753                         *bad_wr = wr;
1754                         goto out;
1755                 }
1756
1757                 for (i = 0; i < wr->num_sge; ++i) {
1758                         mthca_set_data_seg(wqe, wr->sg_list + i);
1759                         wqe  += sizeof (struct mthca_data_seg);
1760                         size += sizeof (struct mthca_data_seg) / 16;
1761                 }
1762
1763                 /* Add one more inline data segment for ICRC */
1764                 if (qp->transport == MLX) {
1765                         ((struct mthca_data_seg *) wqe)->byte_count =
1766                                 cpu_to_be32((1 << 31) | 4);
1767                         ((u32 *) wqe)[1] = 0;
1768                         wqe += sizeof (struct mthca_data_seg);
1769                         size += sizeof (struct mthca_data_seg) / 16;
1770                 }
1771
1772                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
1773
1774                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
1775                         mthca_err(dev, "opcode invalid\n");
1776                         err = -EINVAL;
1777                         *bad_wr = wr;
1778                         goto out;
1779                 }
1780
1781                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1782                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
1783                                      qp->send_wqe_offset) |
1784                                     mthca_opcode[wr->opcode]);
1785                 wmb();
1786                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1787                         cpu_to_be32((nreq ? 0 : MTHCA_NEXT_DBD) | size |
1788                                     ((wr->send_flags & IB_SEND_FENCE) ?
1789                                     MTHCA_NEXT_FENCE : 0));
1790
1791                 if (!nreq) {
1792                         size0 = size;
1793                         op0   = mthca_opcode[wr->opcode];
1794                         f0    = wr->send_flags & IB_SEND_FENCE ?
1795                                 MTHCA_SEND_DOORBELL_FENCE : 0;
1796                 }
1797
1798                 ++ind;
1799                 if (unlikely(ind >= qp->sq.max))
1800                         ind -= qp->sq.max;
1801         }
1802
1803 out:
1804         if (likely(nreq)) {
1805                 wmb();
1806
1807                 mthca_write64(((qp->sq.next_ind << qp->sq.wqe_shift) +
1808                                qp->send_wqe_offset) | f0 | op0,
1809                               (qp->qpn << 8) | size0,
1810                               dev->kar + MTHCA_SEND_DOORBELL,
1811                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1812                 /*
1813                  * Make sure doorbells don't leak out of SQ spinlock
1814                  * and reach the HCA out of order:
1815                  */
1816                 mmiowb();
1817         }
1818
1819         qp->sq.next_ind = ind;
1820         qp->sq.head    += nreq;
1821
1822         spin_unlock_irqrestore(&qp->sq.lock, flags);
1823         return err;
1824 }
1825
1826 int mthca_tavor_post_receive(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
1827                              const struct ib_recv_wr **bad_wr)
1828 {
1829         struct mthca_dev *dev = to_mdev(ibqp->device);
1830         struct mthca_qp *qp = to_mqp(ibqp);
1831         unsigned long flags;
1832         int err = 0;
1833         int nreq;
1834         int i;
1835         int size;
1836         /*
1837          * size0 is only used if nreq != 0, and it will always be
1838          * initialized the first time through the main loop before
1839          * nreq is incremented.  So nreq cannot become non-zero
1840          * without initializing size0, and it is in fact never used
1841          * uninitialized.
1842          */
1843         int uninitialized_var(size0);
1844         int ind;
1845         void *wqe;
1846         void *prev_wqe;
1847
1848         spin_lock_irqsave(&qp->rq.lock, flags);
1849
1850         /* XXX check that state is OK to post receive */
1851
1852         ind = qp->rq.next_ind;
1853
1854         for (nreq = 0; wr; wr = wr->next) {
1855                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1856                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
1857                                         " %d max, %d nreq)\n", qp->qpn,
1858                                         qp->rq.head, qp->rq.tail,
1859                                         qp->rq.max, nreq);
1860                         err = -ENOMEM;
1861                         *bad_wr = wr;
1862                         goto out;
1863                 }
1864
1865                 wqe = get_recv_wqe(qp, ind);
1866                 prev_wqe = qp->rq.last;
1867                 qp->rq.last = wqe;
1868
1869                 ((struct mthca_next_seg *) wqe)->ee_nds =
1870                         cpu_to_be32(MTHCA_NEXT_DBD);
1871                 ((struct mthca_next_seg *) wqe)->flags = 0;
1872
1873                 wqe += sizeof (struct mthca_next_seg);
1874                 size = sizeof (struct mthca_next_seg) / 16;
1875
1876                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1877                         err = -EINVAL;
1878                         *bad_wr = wr;
1879                         goto out;
1880                 }
1881
1882                 for (i = 0; i < wr->num_sge; ++i) {
1883                         mthca_set_data_seg(wqe, wr->sg_list + i);
1884                         wqe  += sizeof (struct mthca_data_seg);
1885                         size += sizeof (struct mthca_data_seg) / 16;
1886                 }
1887
1888                 qp->wrid[ind] = wr->wr_id;
1889
1890                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1891                         cpu_to_be32(MTHCA_NEXT_DBD | size);
1892
1893                 if (!nreq)
1894                         size0 = size;
1895
1896                 ++ind;
1897                 if (unlikely(ind >= qp->rq.max))
1898                         ind -= qp->rq.max;
1899
1900                 ++nreq;
1901                 if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
1902                         nreq = 0;
1903
1904                         wmb();
1905
1906                         mthca_write64((qp->rq.next_ind << qp->rq.wqe_shift) | size0,
1907                                       qp->qpn << 8, dev->kar + MTHCA_RECEIVE_DOORBELL,
1908                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1909
1910                         qp->rq.next_ind = ind;
1911                         qp->rq.head += MTHCA_TAVOR_MAX_WQES_PER_RECV_DB;
1912                 }
1913         }
1914
1915 out:
1916         if (likely(nreq)) {
1917                 wmb();
1918
1919                 mthca_write64((qp->rq.next_ind << qp->rq.wqe_shift) | size0,
1920                               qp->qpn << 8 | nreq, dev->kar + MTHCA_RECEIVE_DOORBELL,
1921                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1922         }
1923
1924         qp->rq.next_ind = ind;
1925         qp->rq.head    += nreq;
1926
1927         /*
1928          * Make sure doorbells don't leak out of RQ spinlock and reach
1929          * the HCA out of order:
1930          */
1931         mmiowb();
1932
1933         spin_unlock_irqrestore(&qp->rq.lock, flags);
1934         return err;
1935 }
1936
1937 int mthca_arbel_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
1938                           const struct ib_send_wr **bad_wr)
1939 {
1940         struct mthca_dev *dev = to_mdev(ibqp->device);
1941         struct mthca_qp *qp = to_mqp(ibqp);
1942         u32 dbhi;
1943         void *wqe;
1944         void *prev_wqe;
1945         unsigned long flags;
1946         int err = 0;
1947         int nreq;
1948         int i;
1949         int size;
1950         /*
1951          * f0 and size0 are only used if nreq != 0, and they will
1952          * always be initialized the first time through the main loop
1953          * before nreq is incremented.  So nreq cannot become non-zero
1954          * without initializing f0 and size0, and they are in fact
1955          * never used uninitialized.
1956          */
1957         int uninitialized_var(size0);
1958         u32 uninitialized_var(f0);
1959         int ind;
1960         u8 op0 = 0;
1961
1962         spin_lock_irqsave(&qp->sq.lock, flags);
1963
1964         /* XXX check that state is OK to post send */
1965
1966         ind = qp->sq.head & (qp->sq.max - 1);
1967
1968         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1969                 if (unlikely(nreq == MTHCA_ARBEL_MAX_WQES_PER_SEND_DB)) {
1970                         nreq = 0;
1971
1972                         dbhi = (MTHCA_ARBEL_MAX_WQES_PER_SEND_DB << 24) |
1973                                 ((qp->sq.head & 0xffff) << 8) | f0 | op0;
1974
1975                         qp->sq.head += MTHCA_ARBEL_MAX_WQES_PER_SEND_DB;
1976
1977                         /*
1978                          * Make sure that descriptors are written before
1979                          * doorbell record.
1980                          */
1981                         wmb();
1982                         *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
1983
1984                         /*
1985                          * Make sure doorbell record is written before we
1986                          * write MMIO send doorbell.
1987                          */
1988                         wmb();
1989
1990                         mthca_write64(dbhi, (qp->qpn << 8) | size0,
1991                                       dev->kar + MTHCA_SEND_DOORBELL,
1992                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1993                 }
1994
1995                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1996                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1997                                         " %d max, %d nreq)\n", qp->qpn,
1998                                         qp->sq.head, qp->sq.tail,
1999                                         qp->sq.max, nreq);
2000                         err = -ENOMEM;
2001                         *bad_wr = wr;
2002                         goto out;
2003                 }
2004
2005                 wqe = get_send_wqe(qp, ind);
2006                 prev_wqe = qp->sq.last;
2007                 qp->sq.last = wqe;
2008
2009                 ((struct mthca_next_seg *) wqe)->flags =
2010                         ((wr->send_flags & IB_SEND_SIGNALED) ?
2011                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
2012                         ((wr->send_flags & IB_SEND_SOLICITED) ?
2013                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
2014                         ((wr->send_flags & IB_SEND_IP_CSUM) ?
2015                          cpu_to_be32(MTHCA_NEXT_IP_CSUM | MTHCA_NEXT_TCP_UDP_CSUM) : 0) |
2016                         cpu_to_be32(1);
2017                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
2018                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
2019                         ((struct mthca_next_seg *) wqe)->imm = wr->ex.imm_data;
2020
2021                 wqe += sizeof (struct mthca_next_seg);
2022                 size = sizeof (struct mthca_next_seg) / 16;
2023
2024                 switch (qp->transport) {
2025                 case RC:
2026                         switch (wr->opcode) {
2027                         case IB_WR_ATOMIC_CMP_AND_SWP:
2028                         case IB_WR_ATOMIC_FETCH_AND_ADD:
2029                                 set_raddr_seg(wqe, atomic_wr(wr)->remote_addr,
2030                                               atomic_wr(wr)->rkey);
2031                                 wqe += sizeof (struct mthca_raddr_seg);
2032
2033                                 set_atomic_seg(wqe, atomic_wr(wr));
2034                                 wqe  += sizeof (struct mthca_atomic_seg);
2035                                 size += (sizeof (struct mthca_raddr_seg) +
2036                                          sizeof (struct mthca_atomic_seg)) / 16;
2037                                 break;
2038
2039                         case IB_WR_RDMA_READ:
2040                         case IB_WR_RDMA_WRITE:
2041                         case IB_WR_RDMA_WRITE_WITH_IMM:
2042                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
2043                                               rdma_wr(wr)->rkey);
2044                                 wqe  += sizeof (struct mthca_raddr_seg);
2045                                 size += sizeof (struct mthca_raddr_seg) / 16;
2046                                 break;
2047
2048                         default:
2049                                 /* No extra segments required for sends */
2050                                 break;
2051                         }
2052
2053                         break;
2054
2055                 case UC:
2056                         switch (wr->opcode) {
2057                         case IB_WR_RDMA_WRITE:
2058                         case IB_WR_RDMA_WRITE_WITH_IMM:
2059                                 set_raddr_seg(wqe, rdma_wr(wr)->remote_addr,
2060                                               rdma_wr(wr)->rkey);
2061                                 wqe  += sizeof (struct mthca_raddr_seg);
2062                                 size += sizeof (struct mthca_raddr_seg) / 16;
2063                                 break;
2064
2065                         default:
2066                                 /* No extra segments required for sends */
2067                                 break;
2068                         }
2069
2070                         break;
2071
2072                 case UD:
2073                         set_arbel_ud_seg(wqe, ud_wr(wr));
2074                         wqe  += sizeof (struct mthca_arbel_ud_seg);
2075                         size += sizeof (struct mthca_arbel_ud_seg) / 16;
2076                         break;
2077
2078                 case MLX:
2079                         err = build_mlx_header(dev, to_msqp(qp), ind, ud_wr(wr),
2080                                                wqe - sizeof (struct mthca_next_seg),
2081                                                wqe);
2082                         if (err) {
2083                                 *bad_wr = wr;
2084                                 goto out;
2085                         }
2086                         wqe += sizeof (struct mthca_data_seg);
2087                         size += sizeof (struct mthca_data_seg) / 16;
2088                         break;
2089                 }
2090
2091                 if (wr->num_sge > qp->sq.max_gs) {
2092                         mthca_err(dev, "too many gathers\n");
2093                         err = -EINVAL;
2094                         *bad_wr = wr;
2095                         goto out;
2096                 }
2097
2098                 for (i = 0; i < wr->num_sge; ++i) {
2099                         mthca_set_data_seg(wqe, wr->sg_list + i);
2100                         wqe  += sizeof (struct mthca_data_seg);
2101                         size += sizeof (struct mthca_data_seg) / 16;
2102                 }
2103
2104                 /* Add one more inline data segment for ICRC */
2105                 if (qp->transport == MLX) {
2106                         ((struct mthca_data_seg *) wqe)->byte_count =
2107                                 cpu_to_be32((1 << 31) | 4);
2108                         ((u32 *) wqe)[1] = 0;
2109                         wqe += sizeof (struct mthca_data_seg);
2110                         size += sizeof (struct mthca_data_seg) / 16;
2111                 }
2112
2113                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
2114
2115                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
2116                         mthca_err(dev, "opcode invalid\n");
2117                         err = -EINVAL;
2118                         *bad_wr = wr;
2119                         goto out;
2120                 }
2121
2122                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
2123                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
2124                                      qp->send_wqe_offset) |
2125                                     mthca_opcode[wr->opcode]);
2126                 wmb();
2127                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
2128                         cpu_to_be32(MTHCA_NEXT_DBD | size |
2129                                     ((wr->send_flags & IB_SEND_FENCE) ?
2130                                      MTHCA_NEXT_FENCE : 0));
2131
2132                 if (!nreq) {
2133                         size0 = size;
2134                         op0   = mthca_opcode[wr->opcode];
2135                         f0    = wr->send_flags & IB_SEND_FENCE ?
2136                                 MTHCA_SEND_DOORBELL_FENCE : 0;
2137                 }
2138
2139                 ++ind;
2140                 if (unlikely(ind >= qp->sq.max))
2141                         ind -= qp->sq.max;
2142         }
2143
2144 out:
2145         if (likely(nreq)) {
2146                 dbhi = (nreq << 24) | ((qp->sq.head & 0xffff) << 8) | f0 | op0;
2147
2148                 qp->sq.head += nreq;
2149
2150                 /*
2151                  * Make sure that descriptors are written before
2152                  * doorbell record.
2153                  */
2154                 wmb();
2155                 *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
2156
2157                 /*
2158                  * Make sure doorbell record is written before we
2159                  * write MMIO send doorbell.
2160                  */
2161                 wmb();
2162
2163                 mthca_write64(dbhi, (qp->qpn << 8) | size0, dev->kar + MTHCA_SEND_DOORBELL,
2164                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
2165         }
2166
2167         /*
2168          * Make sure doorbells don't leak out of SQ spinlock and reach
2169          * the HCA out of order:
2170          */
2171         mmiowb();
2172
2173         spin_unlock_irqrestore(&qp->sq.lock, flags);
2174         return err;
2175 }
2176
2177 int mthca_arbel_post_receive(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
2178                              const struct ib_recv_wr **bad_wr)
2179 {
2180         struct mthca_dev *dev = to_mdev(ibqp->device);
2181         struct mthca_qp *qp = to_mqp(ibqp);
2182         unsigned long flags;
2183         int err = 0;
2184         int nreq;
2185         int ind;
2186         int i;
2187         void *wqe;
2188
2189         spin_lock_irqsave(&qp->rq.lock, flags);
2190
2191         /* XXX check that state is OK to post receive */
2192
2193         ind = qp->rq.head & (qp->rq.max - 1);
2194
2195         for (nreq = 0; wr; ++nreq, wr = wr->next) {
2196                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
2197                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
2198                                         " %d max, %d nreq)\n", qp->qpn,
2199                                         qp->rq.head, qp->rq.tail,
2200                                         qp->rq.max, nreq);
2201                         err = -ENOMEM;
2202                         *bad_wr = wr;
2203                         goto out;
2204                 }
2205
2206                 wqe = get_recv_wqe(qp, ind);
2207
2208                 ((struct mthca_next_seg *) wqe)->flags = 0;
2209
2210                 wqe += sizeof (struct mthca_next_seg);
2211
2212                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
2213                         err = -EINVAL;
2214                         *bad_wr = wr;
2215                         goto out;
2216                 }
2217
2218                 for (i = 0; i < wr->num_sge; ++i) {
2219                         mthca_set_data_seg(wqe, wr->sg_list + i);
2220                         wqe += sizeof (struct mthca_data_seg);
2221                 }
2222
2223                 if (i < qp->rq.max_gs)
2224                         mthca_set_data_seg_inval(wqe);
2225
2226                 qp->wrid[ind] = wr->wr_id;
2227
2228                 ++ind;
2229                 if (unlikely(ind >= qp->rq.max))
2230                         ind -= qp->rq.max;
2231         }
2232 out:
2233         if (likely(nreq)) {
2234                 qp->rq.head += nreq;
2235
2236                 /*
2237                  * Make sure that descriptors are written before
2238                  * doorbell record.
2239                  */
2240                 wmb();
2241                 *qp->rq.db = cpu_to_be32(qp->rq.head & 0xffff);
2242         }
2243
2244         spin_unlock_irqrestore(&qp->rq.lock, flags);
2245         return err;
2246 }
2247
2248 void mthca_free_err_wqe(struct mthca_dev *dev, struct mthca_qp *qp, int is_send,
2249                         int index, int *dbd, __be32 *new_wqe)
2250 {
2251         struct mthca_next_seg *next;
2252
2253         /*
2254          * For SRQs, all receive WQEs generate a CQE, so we're always
2255          * at the end of the doorbell chain.
2256          */
2257         if (qp->ibqp.srq && !is_send) {
2258                 *new_wqe = 0;
2259                 return;
2260         }
2261
2262         if (is_send)
2263                 next = get_send_wqe(qp, index);
2264         else
2265                 next = get_recv_wqe(qp, index);
2266
2267         *dbd = !!(next->ee_nds & cpu_to_be32(MTHCA_NEXT_DBD));
2268         if (next->ee_nds & cpu_to_be32(0x3f))
2269                 *new_wqe = (next->nda_op & cpu_to_be32(~0x3f)) |
2270                         (next->ee_nds & cpu_to_be32(0x3f));
2271         else
2272                 *new_wqe = 0;
2273 }
2274
2275 int mthca_init_qp_table(struct mthca_dev *dev)
2276 {
2277         int err;
2278         int i;
2279
2280         spin_lock_init(&dev->qp_table.lock);
2281
2282         /*
2283          * We reserve 2 extra QPs per port for the special QPs.  The
2284          * special QP for port 1 has to be even, so round up.
2285          */
2286         dev->qp_table.sqp_start = (dev->limits.reserved_qps + 1) & ~1UL;
2287         err = mthca_alloc_init(&dev->qp_table.alloc,
2288                                dev->limits.num_qps,
2289                                (1 << 24) - 1,
2290                                dev->qp_table.sqp_start +
2291                                MTHCA_MAX_PORTS * 2);
2292         if (err)
2293                 return err;
2294
2295         err = mthca_array_init(&dev->qp_table.qp,
2296                                dev->limits.num_qps);
2297         if (err) {
2298                 mthca_alloc_cleanup(&dev->qp_table.alloc);
2299                 return err;
2300         }
2301
2302         for (i = 0; i < 2; ++i) {
2303                 err = mthca_CONF_SPECIAL_QP(dev, i ? IB_QPT_GSI : IB_QPT_SMI,
2304                                     dev->qp_table.sqp_start + i * 2);
2305                 if (err) {
2306                         mthca_warn(dev, "CONF_SPECIAL_QP returned "
2307                                    "%d, aborting.\n", err);
2308                         goto err_out;
2309                 }
2310         }
2311         return 0;
2312
2313  err_out:
2314         for (i = 0; i < 2; ++i)
2315                 mthca_CONF_SPECIAL_QP(dev, i, 0);
2316
2317         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2318         mthca_alloc_cleanup(&dev->qp_table.alloc);
2319
2320         return err;
2321 }
2322
2323 void mthca_cleanup_qp_table(struct mthca_dev *dev)
2324 {
2325         int i;
2326
2327         for (i = 0; i < 2; ++i)
2328                 mthca_CONF_SPECIAL_QP(dev, i, 0);
2329
2330         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2331         mthca_alloc_cleanup(&dev->qp_table.alloc);
2332 }