git.oblomov.eu Git - linux-2.6/blob - 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  * $Id: mthca_qp.c 1355 2004-12-17 15:23:43Z roland $
  36  */
  37
  38 #include <linux/string.h>
  39 #include <linux/slab.h>
  40
  41 #include <asm/io.h>
  42
  43 #include <rdma/ib_verbs.h>
  44 #include <rdma/ib_cache.h>
  45 #include <rdma/ib_pack.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 } __attribute__((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 } __attribute__((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 } __attribute__((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 for bogus QP %08x\n", qpn);
 252                 return;
 253         }
 254
 255         if (event_type == IB_EVENT_PATH_MIG)
 256                 qp->port = qp->alt_port;
 257
 258         event.device      = &dev->ib_dev;
 259         event.event       = event_type;
 260         event.element.qp  = &qp->ibqp;
 261         if (qp->ibqp.event_handler)
 262                 qp->ibqp.event_handler(&event, qp->ibqp.qp_context);
 263
 264         spin_lock(&dev->qp_table.lock);
 265         if (!--qp->refcount)
 266                 wake_up(&qp->wait);
 267         spin_unlock(&dev->qp_table.lock);
 268 }
 269
 270 static int to_mthca_state(enum ib_qp_state ib_state)
 271 {
 272         switch (ib_state) {
 273         case IB_QPS_RESET: return MTHCA_QP_STATE_RST;
 274         case IB_QPS_INIT:  return MTHCA_QP_STATE_INIT;
 275         case IB_QPS_RTR:   return MTHCA_QP_STATE_RTR;
 276         case IB_QPS_RTS:   return MTHCA_QP_STATE_RTS;
 277         case IB_QPS_SQD:   return MTHCA_QP_STATE_SQD;
 278         case IB_QPS_SQE:   return MTHCA_QP_STATE_SQE;
 279         case IB_QPS_ERR:   return MTHCA_QP_STATE_ERR;
 280         default:                return -1;
 281         }
 282 }
 283
 284 enum { RC, UC, UD, RD, RDEE, MLX, NUM_TRANS };
 285
 286 static int to_mthca_st(int transport)
 287 {
 288         switch (transport) {
 289         case RC:  return MTHCA_QP_ST_RC;
 290         case UC:  return MTHCA_QP_ST_UC;
 291         case UD:  return MTHCA_QP_ST_UD;
 292         case RD:  return MTHCA_QP_ST_RD;
 293         case MLX: return MTHCA_QP_ST_MLX;
 294         default:  return -1;
 295         }
 296 }
 297
 298 static void store_attrs(struct mthca_sqp *sqp, struct ib_qp_attr *attr,
 299                         int attr_mask)
 300 {
 301         if (attr_mask & IB_QP_PKEY_INDEX)
 302                 sqp->pkey_index = attr->pkey_index;
 303         if (attr_mask & IB_QP_QKEY)
 304                 sqp->qkey = attr->qkey;
 305         if (attr_mask & IB_QP_SQ_PSN)
 306                 sqp->send_psn = attr->sq_psn;
 307 }
 308
 309 static void init_port(struct mthca_dev *dev, int port)
 310 {
 311         int err;
 312         u8 status;
 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, &status);
 324         if (err)
 325                 mthca_warn(dev, "INIT_IB failed, return code %d.\n", err);
 326         if (status)
 327                 mthca_warn(dev, "INIT_IB returned status %02x.\n", status);
 328 }
 329
 330 static __be32 get_hw_access_flags(struct mthca_qp *qp, struct ib_qp_attr *attr,
 331                                   int attr_mask)
 332 {
 333         u8 dest_rd_atomic;
 334         u32 access_flags;
 335         u32 hw_access_flags = 0;
 336
 337         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 338                 dest_rd_atomic = attr->max_dest_rd_atomic;
 339         else
 340                 dest_rd_atomic = qp->resp_depth;
 341
 342         if (attr_mask & IB_QP_ACCESS_FLAGS)
 343                 access_flags = attr->qp_access_flags;
 344         else
 345                 access_flags = qp->atomic_rd_en;
 346
 347         if (!dest_rd_atomic)
 348                 access_flags &= IB_ACCESS_REMOTE_WRITE;
 349
 350         if (access_flags & IB_ACCESS_REMOTE_READ)
 351                 hw_access_flags |= MTHCA_QP_BIT_RRE;
 352         if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
 353                 hw_access_flags |= MTHCA_QP_BIT_RAE;
 354         if (access_flags & IB_ACCESS_REMOTE_WRITE)
 355                 hw_access_flags |= MTHCA_QP_BIT_RWE;
 356
 357         return cpu_to_be32(hw_access_flags);
 358 }
 359
 360 static inline enum ib_qp_state to_ib_qp_state(int mthca_state)
 361 {
 362         switch (mthca_state) {
 363         case MTHCA_QP_STATE_RST:      return IB_QPS_RESET;
 364         case MTHCA_QP_STATE_INIT:     return IB_QPS_INIT;
 365         case MTHCA_QP_STATE_RTR:      return IB_QPS_RTR;
 366         case MTHCA_QP_STATE_RTS:      return IB_QPS_RTS;
 367         case MTHCA_QP_STATE_DRAINING:
 368         case MTHCA_QP_STATE_SQD:      return IB_QPS_SQD;
 369         case MTHCA_QP_STATE_SQE:      return IB_QPS_SQE;
 370         case MTHCA_QP_STATE_ERR:      return IB_QPS_ERR;
 371         default:                      return -1;
 372         }
 373 }
 374
 375 static inline enum ib_mig_state to_ib_mig_state(int mthca_mig_state)
 376 {
 377         switch (mthca_mig_state) {
 378         case 0:  return IB_MIG_ARMED;
 379         case 1:  return IB_MIG_REARM;
 380         case 3:  return IB_MIG_MIGRATED;
 381         default: return -1;
 382         }
 383 }
 384
 385 static int to_ib_qp_access_flags(int mthca_flags)
 386 {
 387         int ib_flags = 0;
 388
 389         if (mthca_flags & MTHCA_QP_BIT_RRE)
 390                 ib_flags |= IB_ACCESS_REMOTE_READ;
 391         if (mthca_flags & MTHCA_QP_BIT_RWE)
 392                 ib_flags |= IB_ACCESS_REMOTE_WRITE;
 393         if (mthca_flags & MTHCA_QP_BIT_RAE)
 394                 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
 395
 396         return ib_flags;
 397 }
 398
 399 static void to_ib_ah_attr(struct mthca_dev *dev, struct ib_ah_attr *ib_ah_attr,
 400                                 struct mthca_qp_path *path)
 401 {
 402         memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
 403         ib_ah_attr->port_num      = (be32_to_cpu(path->port_pkey) >> 24) & 0x3;
 404
 405         if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->limits.num_ports)
 406                 return;
 407
 408         ib_ah_attr->dlid          = be16_to_cpu(path->rlid);
 409         ib_ah_attr->sl            = be32_to_cpu(path->sl_tclass_flowlabel) >> 28;
 410         ib_ah_attr->src_path_bits = path->g_mylmc & 0x7f;
 411         ib_ah_attr->static_rate   = mthca_rate_to_ib(dev,
 412                                                      path->static_rate & 0xf,
 413                                                      ib_ah_attr->port_num);
 414         ib_ah_attr->ah_flags      = (path->g_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
 415         if (ib_ah_attr->ah_flags) {
 416                 ib_ah_attr->grh.sgid_index = path->mgid_index & (dev->limits.gid_table_len - 1);
 417                 ib_ah_attr->grh.hop_limit  = path->hop_limit;
 418                 ib_ah_attr->grh.traffic_class =
 419                         (be32_to_cpu(path->sl_tclass_flowlabel) >> 20) & 0xff;
 420                 ib_ah_attr->grh.flow_label =
 421                         be32_to_cpu(path->sl_tclass_flowlabel) & 0xfffff;
 422                 memcpy(ib_ah_attr->grh.dgid.raw,
 423                         path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
 424         }
 425 }
 426
 427 int mthca_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
 428                    struct ib_qp_init_attr *qp_init_attr)
 429 {
 430         struct mthca_dev *dev = to_mdev(ibqp->device);
 431         struct mthca_qp *qp = to_mqp(ibqp);
 432         int err = 0;
 433         struct mthca_mailbox *mailbox = NULL;
 434         struct mthca_qp_param *qp_param;
 435         struct mthca_qp_context *context;
 436         int mthca_state;
 437         u8 status;
 438
 439         if (qp->state == IB_QPS_RESET) {
 440                 qp_attr->qp_state = IB_QPS_RESET;
 441                 goto done;
 442         }
 443
 444         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 445         if (IS_ERR(mailbox))
 446                 return PTR_ERR(mailbox);
 447
 448         err = mthca_QUERY_QP(dev, qp->qpn, 0, mailbox, &status);
 449         if (err)
 450                 goto out;
 451         if (status) {
 452                 mthca_warn(dev, "QUERY_QP returned status %02x\n", status);
 453                 err = -EINVAL;
 454                 goto out;
 455         }
 456
 457         qp_param    = mailbox->buf;
 458         context     = &qp_param->context;
 459         mthca_state = be32_to_cpu(context->flags) >> 28;
 460
 461         qp_attr->qp_state            = to_ib_qp_state(mthca_state);
 462         qp_attr->path_mtu            = context->mtu_msgmax >> 5;
 463         qp_attr->path_mig_state      =
 464                 to_ib_mig_state((be32_to_cpu(context->flags) >> 11) & 0x3);
 465         qp_attr->qkey                = be32_to_cpu(context->qkey);
 466         qp_attr->rq_psn              = be32_to_cpu(context->rnr_nextrecvpsn) & 0xffffff;
 467         qp_attr->sq_psn              = be32_to_cpu(context->next_send_psn) & 0xffffff;
 468         qp_attr->dest_qp_num         = be32_to_cpu(context->remote_qpn) & 0xffffff;
 469         qp_attr->qp_access_flags     =
 470                 to_ib_qp_access_flags(be32_to_cpu(context->params2));
 471
 472         if (qp->transport == RC || qp->transport == UC) {
 473                 to_ib_ah_attr(dev, &qp_attr->ah_attr, &context->pri_path);
 474                 to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context->alt_path);
 475                 qp_attr->alt_pkey_index =
 476                         be32_to_cpu(context->alt_path.port_pkey) & 0x7f;
 477                 qp_attr->alt_port_num   = qp_attr->alt_ah_attr.port_num;
 478         }
 479
 480         qp_attr->pkey_index = be32_to_cpu(context->pri_path.port_pkey) & 0x7f;
 481         qp_attr->port_num   =
 482                 (be32_to_cpu(context->pri_path.port_pkey) >> 24) & 0x3;
 483
 484         /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
 485         qp_attr->sq_draining = mthca_state == MTHCA_QP_STATE_DRAINING;
 486
 487         qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context->params1) >> 21) & 0x7);
 488
 489         qp_attr->max_dest_rd_atomic =
 490                 1 << ((be32_to_cpu(context->params2) >> 21) & 0x7);
 491         qp_attr->min_rnr_timer      =
 492                 (be32_to_cpu(context->rnr_nextrecvpsn) >> 24) & 0x1f;
 493         qp_attr->timeout            = context->pri_path.ackto >> 3;
 494         qp_attr->retry_cnt          = (be32_to_cpu(context->params1) >> 16) & 0x7;
 495         qp_attr->rnr_retry          = context->pri_path.rnr_retry >> 5;
 496         qp_attr->alt_timeout        = context->alt_path.ackto >> 3;
 497
 498 done:
 499         qp_attr->cur_qp_state        = qp_attr->qp_state;
 500         qp_attr->cap.max_send_wr     = qp->sq.max;
 501         qp_attr->cap.max_recv_wr     = qp->rq.max;
 502         qp_attr->cap.max_send_sge    = qp->sq.max_gs;
 503         qp_attr->cap.max_recv_sge    = qp->rq.max_gs;
 504         qp_attr->cap.max_inline_data = qp->max_inline_data;
 505
 506         qp_init_attr->cap            = qp_attr->cap;
 507
 508 out:
 509         mthca_free_mailbox(dev, mailbox);
 510         return err;
 511 }
 512
 513 static int mthca_path_set(struct mthca_dev *dev, struct ib_ah_attr *ah,
 514                           struct mthca_qp_path *path, u8 port)
 515 {
 516         path->g_mylmc     = ah->src_path_bits & 0x7f;
 517         path->rlid        = cpu_to_be16(ah->dlid);
 518         path->static_rate = mthca_get_rate(dev, ah->static_rate, port);
 519
 520         if (ah->ah_flags & IB_AH_GRH) {
 521                 if (ah->grh.sgid_index >= dev->limits.gid_table_len) {
 522                         mthca_dbg(dev, "sgid_index (%u) too large. max is %d\n",
 523                                   ah->grh.sgid_index, dev->limits.gid_table_len-1);
 524                         return -1;
 525                 }
 526
 527                 path->g_mylmc   |= 1 << 7;
 528                 path->mgid_index = ah->grh.sgid_index;
 529                 path->hop_limit  = ah->grh.hop_limit;
 530                 path->sl_tclass_flowlabel =
 531                         cpu_to_be32((ah->sl << 28)                |
 532                                     (ah->grh.traffic_class << 20) |
 533                                     (ah->grh.flow_label));
 534                 memcpy(path->rgid, ah->grh.dgid.raw, 16);
 535         } else
 536                 path->sl_tclass_flowlabel = cpu_to_be32(ah->sl << 28);
 537
 538         return 0;
 539 }
 540
 541 int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask,
 542                     struct ib_udata *udata)
 543 {
 544         struct mthca_dev *dev = to_mdev(ibqp->device);
 545         struct mthca_qp *qp = to_mqp(ibqp);
 546         enum ib_qp_state cur_state, new_state;
 547         struct mthca_mailbox *mailbox;
 548         struct mthca_qp_param *qp_param;
 549         struct mthca_qp_context *qp_context;
 550         u32 sqd_event = 0;
 551         u8 status;
 552         int err = -EINVAL;
 553
 554         mutex_lock(&qp->mutex);
 555
 556         if (attr_mask & IB_QP_CUR_STATE) {
 557                 cur_state = attr->cur_qp_state;
 558         } else {
 559                 spin_lock_irq(&qp->sq.lock);
 560                 spin_lock(&qp->rq.lock);
 561                 cur_state = qp->state;
 562                 spin_unlock(&qp->rq.lock);
 563                 spin_unlock_irq(&qp->sq.lock);
 564         }
 565
 566         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
 567
 568         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) {
 569                 mthca_dbg(dev, "Bad QP transition (transport %d) "
 570                           "%d->%d with attr 0x%08x\n",
 571                           qp->transport, cur_state, new_state,
 572                           attr_mask);
 573                 goto out;
 574         }
 575
 576         if (cur_state == new_state && cur_state == IB_QPS_RESET) {
 577                 err = 0;
 578                 goto out;
 579         }
 580
 581         if ((attr_mask & IB_QP_PKEY_INDEX) &&
 582              attr->pkey_index >= dev->limits.pkey_table_len) {
 583                 mthca_dbg(dev, "P_Key index (%u) too large. max is %d\n",
 584                           attr->pkey_index, dev->limits.pkey_table_len-1);
 585                 goto out;
 586         }
 587
 588         if ((attr_mask & IB_QP_PORT) &&
 589             (attr->port_num == 0 || attr->port_num > dev->limits.num_ports)) {
 590                 mthca_dbg(dev, "Port number (%u) is invalid\n", attr->port_num);
 591                 goto out;
 592         }
 593
 594         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
 595             attr->max_rd_atomic > dev->limits.max_qp_init_rdma) {
 596                 mthca_dbg(dev, "Max rdma_atomic as initiator %u too large (max is %d)\n",
 597                           attr->max_rd_atomic, dev->limits.max_qp_init_rdma);
 598                 goto out;
 599         }
 600
 601         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
 602             attr->max_dest_rd_atomic > 1 << dev->qp_table.rdb_shift) {
 603                 mthca_dbg(dev, "Max rdma_atomic as responder %u too large (max %d)\n",
 604                           attr->max_dest_rd_atomic, 1 << dev->qp_table.rdb_shift);
 605                 goto out;
 606         }
 607
 608         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 609         if (IS_ERR(mailbox)) {
 610                 err = PTR_ERR(mailbox);
 611                 goto out;
 612         }
 613         qp_param = mailbox->buf;
 614         qp_context = &qp_param->context;
 615         memset(qp_param, 0, sizeof *qp_param);
 616
 617         qp_context->flags      = cpu_to_be32((to_mthca_state(new_state) << 28) |
 618                                              (to_mthca_st(qp->transport) << 16));
 619         qp_context->flags     |= cpu_to_be32(MTHCA_QP_BIT_DE);
 620         if (!(attr_mask & IB_QP_PATH_MIG_STATE))
 621                 qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_MIGRATED << 11);
 622         else {
 623                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PM_STATE);
 624                 switch (attr->path_mig_state) {
 625                 case IB_MIG_MIGRATED:
 626                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_MIGRATED << 11);
 627                         break;
 628                 case IB_MIG_REARM:
 629                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_REARM << 11);
 630                         break;
 631                 case IB_MIG_ARMED:
 632                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_ARMED << 11);
 633                         break;
 634                 }
 635         }
 636
 637         /* leave tavor_sched_queue as 0 */
 638
 639         if (qp->transport == MLX || qp->transport == UD)
 640                 qp_context->mtu_msgmax = (IB_MTU_2048 << 5) | 11;
 641         else if (attr_mask & IB_QP_PATH_MTU) {
 642                 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_2048) {
 643                         mthca_dbg(dev, "path MTU (%u) is invalid\n",
 644                                   attr->path_mtu);
 645                         goto out_mailbox;
 646                 }
 647                 qp_context->mtu_msgmax = (attr->path_mtu << 5) | 31;
 648         }
 649
 650         if (mthca_is_memfree(dev)) {
 651                 if (qp->rq.max)
 652                         qp_context->rq_size_stride = ilog2(qp->rq.max) << 3;
 653                 qp_context->rq_size_stride |= qp->rq.wqe_shift - 4;
 654
 655                 if (qp->sq.max)
 656                         qp_context->sq_size_stride = ilog2(qp->sq.max) << 3;
 657                 qp_context->sq_size_stride |= qp->sq.wqe_shift - 4;
 658         }
 659
 660         /* leave arbel_sched_queue as 0 */
 661
 662         if (qp->ibqp.uobject)
 663                 qp_context->usr_page =
 664                         cpu_to_be32(to_mucontext(qp->ibqp.uobject->context)->uar.index);
 665         else
 666                 qp_context->usr_page = cpu_to_be32(dev->driver_uar.index);
 667         qp_context->local_qpn  = cpu_to_be32(qp->qpn);
 668         if (attr_mask & IB_QP_DEST_QPN) {
 669                 qp_context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
 670         }
 671
 672         if (qp->transport == MLX)
 673                 qp_context->pri_path.port_pkey |=
 674                         cpu_to_be32(qp->port << 24);
 675         else {
 676                 if (attr_mask & IB_QP_PORT) {
 677                         qp_context->pri_path.port_pkey |=
 678                                 cpu_to_be32(attr->port_num << 24);
 679                         qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PORT_NUM);
 680                 }
 681         }
 682
 683         if (attr_mask & IB_QP_PKEY_INDEX) {
 684                 qp_context->pri_path.port_pkey |=
 685                         cpu_to_be32(attr->pkey_index);
 686                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PKEY_INDEX);
 687         }
 688
 689         if (attr_mask & IB_QP_RNR_RETRY) {
 690                 qp_context->alt_path.rnr_retry = qp_context->pri_path.rnr_retry =
 691                         attr->rnr_retry << 5;
 692                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RNR_RETRY |
 693                                                         MTHCA_QP_OPTPAR_ALT_RNR_RETRY);
 694         }
 695
 696         if (attr_mask & IB_QP_AV) {
 697                 if (mthca_path_set(dev, &attr->ah_attr, &qp_context->pri_path,
 698                                    attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
 699                         goto out_mailbox;
 700
 701                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PRIMARY_ADDR_PATH);
 702         }
 703
 704         if (attr_mask & IB_QP_TIMEOUT) {
 705                 qp_context->pri_path.ackto = attr->timeout << 3;
 706                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_ACK_TIMEOUT);
 707         }
 708
 709         if (attr_mask & IB_QP_ALT_PATH) {
 710                 if (attr->alt_pkey_index >= dev->limits.pkey_table_len) {
 711                         mthca_dbg(dev, "Alternate P_Key index (%u) too large. max is %d\n",
 712                                   attr->alt_pkey_index, dev->limits.pkey_table_len-1);
 713                         goto out_mailbox;
 714                 }
 715
 716                 if (attr->alt_port_num == 0 || attr->alt_port_num > dev->limits.num_ports) {
 717                         mthca_dbg(dev, "Alternate port number (%u) is invalid\n",
 718                                 attr->alt_port_num);
 719                         goto out_mailbox;
 720                 }
 721
 722                 if (mthca_path_set(dev, &attr->alt_ah_attr, &qp_context->alt_path,
 723                                    attr->alt_ah_attr.port_num))
 724                         goto out_mailbox;
 725
 726                 qp_context->alt_path.port_pkey |= cpu_to_be32(attr->alt_pkey_index |
 727                                                               attr->alt_port_num << 24);
 728                 qp_context->alt_path.ackto = attr->alt_timeout << 3;
 729                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_ALT_ADDR_PATH);
 730         }
 731
 732         /* leave rdd as 0 */
 733         qp_context->pd         = cpu_to_be32(to_mpd(ibqp->pd)->pd_num);
 734         /* leave wqe_base as 0 (we always create an MR based at 0 for WQs) */
 735         qp_context->wqe_lkey   = cpu_to_be32(qp->mr.ibmr.lkey);
 736         qp_context->params1    = cpu_to_be32((MTHCA_ACK_REQ_FREQ << 28) |
 737                                              (MTHCA_FLIGHT_LIMIT << 24) |
 738                                              MTHCA_QP_BIT_SWE);
 739         if (qp->sq_policy == IB_SIGNAL_ALL_WR)
 740                 qp_context->params1 |= cpu_to_be32(MTHCA_QP_BIT_SSC);
 741         if (attr_mask & IB_QP_RETRY_CNT) {
 742                 qp_context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
 743                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RETRY_COUNT);
 744         }
 745
 746         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
 747                 if (attr->max_rd_atomic) {
 748                         qp_context->params1 |=
 749                                 cpu_to_be32(MTHCA_QP_BIT_SRE |
 750                                             MTHCA_QP_BIT_SAE);
 751                         qp_context->params1 |=
 752                                 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
 753                 }
 754                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_SRA_MAX);
 755         }
 756
 757         if (attr_mask & IB_QP_SQ_PSN)
 758                 qp_context->next_send_psn = cpu_to_be32(attr->sq_psn);
 759         qp_context->cqn_snd = cpu_to_be32(to_mcq(ibqp->send_cq)->cqn);
 760
 761         if (mthca_is_memfree(dev)) {
 762                 qp_context->snd_wqe_base_l = cpu_to_be32(qp->send_wqe_offset);
 763                 qp_context->snd_db_index   = cpu_to_be32(qp->sq.db_index);
 764         }
 765
 766         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
 767                 if (attr->max_dest_rd_atomic)
 768                         qp_context->params2 |=
 769                                 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
 770
 771                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RRA_MAX);
 772         }
 773
 774         if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
 775                 qp_context->params2      |= get_hw_access_flags(qp, attr, attr_mask);
 776                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RWE |
 777                                                         MTHCA_QP_OPTPAR_RRE |
 778                                                         MTHCA_QP_OPTPAR_RAE);
 779         }
 780
 781         qp_context->params2 |= cpu_to_be32(MTHCA_QP_BIT_RSC);
 782
 783         if (ibqp->srq)
 784                 qp_context->params2 |= cpu_to_be32(MTHCA_QP_BIT_RIC);
 785
 786         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 787                 qp_context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
 788                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RNR_TIMEOUT);
 789         }
 790         if (attr_mask & IB_QP_RQ_PSN)
 791                 qp_context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
 792
 793         qp_context->ra_buff_indx =
 794                 cpu_to_be32(dev->qp_table.rdb_base +
 795                             ((qp->qpn & (dev->limits.num_qps - 1)) * MTHCA_RDB_ENTRY_SIZE <<
 796                              dev->qp_table.rdb_shift));
 797
 798         qp_context->cqn_rcv = cpu_to_be32(to_mcq(ibqp->recv_cq)->cqn);
 799
 800         if (mthca_is_memfree(dev))
 801                 qp_context->rcv_db_index   = cpu_to_be32(qp->rq.db_index);
 802
 803         if (attr_mask & IB_QP_QKEY) {
 804                 qp_context->qkey = cpu_to_be32(attr->qkey);
 805                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_Q_KEY);
 806         }
 807
 808         if (ibqp->srq)
 809                 qp_context->srqn = cpu_to_be32(1 << 24 |
 810                                                to_msrq(ibqp->srq)->srqn);
 811
 812         if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD  &&
 813             attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY               &&
 814             attr->en_sqd_async_notify)
 815                 sqd_event = 1 << 31;
 816
 817         err = mthca_MODIFY_QP(dev, cur_state, new_state, qp->qpn, 0,
 818                               mailbox, sqd_event, &status);
 819         if (err)
 820                 goto out_mailbox;
 821         if (status) {
 822                 mthca_warn(dev, "modify QP %d->%d returned status %02x.\n",
 823                            cur_state, new_state, status);
 824                 err = -EINVAL;
 825                 goto out_mailbox;
 826         }
 827
 828         qp->state = new_state;
 829         if (attr_mask & IB_QP_ACCESS_FLAGS)
 830                 qp->atomic_rd_en = attr->qp_access_flags;
 831         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 832                 qp->resp_depth = attr->max_dest_rd_atomic;
 833         if (attr_mask & IB_QP_PORT)
 834                 qp->port = attr->port_num;
 835         if (attr_mask & IB_QP_ALT_PATH)
 836                 qp->alt_port = attr->alt_port_num;
 837
 838         if (is_sqp(dev, qp))
 839                 store_attrs(to_msqp(qp), attr, attr_mask);
 840
 841         /*
 842          * If we moved QP0 to RTR, bring the IB link up; if we moved
 843          * QP0 to RESET or ERROR, bring the link back down.
 844          */
 845         if (is_qp0(dev, qp)) {
 846                 if (cur_state != IB_QPS_RTR &&
 847                     new_state == IB_QPS_RTR)
 848                         init_port(dev, qp->port);
 849
 850                 if (cur_state != IB_QPS_RESET &&
 851                     cur_state != IB_QPS_ERR &&
 852                     (new_state == IB_QPS_RESET ||
 853                      new_state == IB_QPS_ERR))
 854                         mthca_CLOSE_IB(dev, qp->port, &status);
 855         }
 856
 857         /*
 858          * If we moved a kernel QP to RESET, clean up all old CQ
 859          * entries and reinitialize the QP.
 860          */
 861         if (new_state == IB_QPS_RESET && !qp->ibqp.uobject) {
 862                 mthca_cq_clean(dev, to_mcq(qp->ibqp.recv_cq), qp->qpn,
 863                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
 864                 if (qp->ibqp.send_cq != qp->ibqp.recv_cq)
 865                         mthca_cq_clean(dev, to_mcq(qp->ibqp.send_cq), qp->qpn, NULL);
 866
 867                 mthca_wq_reset(&qp->sq);
 868                 qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
 869
 870                 mthca_wq_reset(&qp->rq);
 871                 qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
 872
 873                 if (mthca_is_memfree(dev)) {
 874                         *qp->sq.db = 0;
 875                         *qp->rq.db = 0;
 876                 }
 877         }
 878
 879 out_mailbox:
 880         mthca_free_mailbox(dev, mailbox);
 881
 882 out:
 883         mutex_unlock(&qp->mutex);
 884         return err;
 885 }
 886
 887 static int mthca_max_data_size(struct mthca_dev *dev, struct mthca_qp *qp, int desc_sz)
 888 {
 889         /*
 890          * Calculate the maximum size of WQE s/g segments, excluding
 891          * the next segment and other non-data segments.
 892          */
 893         int max_data_size = desc_sz - sizeof (struct mthca_next_seg);
 894
 895         switch (qp->transport) {
 896         case MLX:
 897                 max_data_size -= 2 * sizeof (struct mthca_data_seg);
 898                 break;
 899
 900         case UD:
 901                 if (mthca_is_memfree(dev))
 902                         max_data_size -= sizeof (struct mthca_arbel_ud_seg);
 903                 else
 904                         max_data_size -= sizeof (struct mthca_tavor_ud_seg);
 905                 break;
 906
 907         default:
 908                 max_data_size -= sizeof (struct mthca_raddr_seg);
 909                 break;
 910         }
 911
 912         return max_data_size;
 913 }
 914
 915 static inline int mthca_max_inline_data(struct mthca_pd *pd, int max_data_size)
 916 {
 917         /* We don't support inline data for kernel QPs (yet). */
 918         return pd->ibpd.uobject ? max_data_size - MTHCA_INLINE_HEADER_SIZE : 0;
 919 }
 920
 921 static void mthca_adjust_qp_caps(struct mthca_dev *dev,
 922                                  struct mthca_pd *pd,
 923                                  struct mthca_qp *qp)
 924 {
 925         int max_data_size = mthca_max_data_size(dev, qp,
 926                                                 min(dev->limits.max_desc_sz,
 927                                                     1 << qp->sq.wqe_shift));
 928
 929         qp->max_inline_data = mthca_max_inline_data(pd, max_data_size);
 930
 931         qp->sq.max_gs = min_t(int, dev->limits.max_sg,
 932                               max_data_size / sizeof (struct mthca_data_seg));
 933         qp->rq.max_gs = min_t(int, dev->limits.max_sg,
 934                                (min(dev->limits.max_desc_sz, 1 << qp->rq.wqe_shift) -
 935                                 sizeof (struct mthca_next_seg)) /
 936                                sizeof (struct mthca_data_seg));
 937 }
 938
 939 /*
 940  * Allocate and register buffer for WQEs.  qp->rq.max, sq.max,
 941  * rq.max_gs and sq.max_gs must all be assigned.
 942  * mthca_alloc_wqe_buf will calculate rq.wqe_shift and
 943  * sq.wqe_shift (as well as send_wqe_offset, is_direct, and
 944  * queue)
 945  */
 946 static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 947                                struct mthca_pd *pd,
 948                                struct mthca_qp *qp)
 949 {
 950         int size;
 951         int err = -ENOMEM;
 952
 953         size = sizeof (struct mthca_next_seg) +
 954                 qp->rq.max_gs * sizeof (struct mthca_data_seg);
 955
 956         if (size > dev->limits.max_desc_sz)
 957                 return -EINVAL;
 958
 959         for (qp->rq.wqe_shift = 6; 1 << qp->rq.wqe_shift < size;
 960              qp->rq.wqe_shift++)
 961                 ; /* nothing */
 962
 963         size = qp->sq.max_gs * sizeof (struct mthca_data_seg);
 964         switch (qp->transport) {
 965         case MLX:
 966                 size += 2 * sizeof (struct mthca_data_seg);
 967                 break;
 968
 969         case UD:
 970                 size += mthca_is_memfree(dev) ?
 971                         sizeof (struct mthca_arbel_ud_seg) :
 972                         sizeof (struct mthca_tavor_ud_seg);
 973                 break;
 974
 975         case UC:
 976                 size += sizeof (struct mthca_raddr_seg);
 977                 break;
 978
 979         case RC:
 980                 size += sizeof (struct mthca_raddr_seg);
 981                 /*
 982                  * An atomic op will require an atomic segment, a
 983                  * remote address segment and one scatter entry.
 984                  */
 985                 size = max_t(int, size,
 986                              sizeof (struct mthca_atomic_seg) +
 987                              sizeof (struct mthca_raddr_seg) +
 988                              sizeof (struct mthca_data_seg));
 989                 break;
 990
 991         default:
 992                 break;
 993         }
 994
 995         /* Make sure that we have enough space for a bind request */
 996         size = max_t(int, size, sizeof (struct mthca_bind_seg));
 997
 998         size += sizeof (struct mthca_next_seg);
 999
1000         if (size > dev->limits.max_desc_sz)
1001                 return -EINVAL;
1002
1003         for (qp->sq.wqe_shift = 6; 1 << qp->sq.wqe_shift < size;
1004              qp->sq.wqe_shift++)
1005                 ; /* nothing */
1006
1007         qp->send_wqe_offset = ALIGN(qp->rq.max << qp->rq.wqe_shift,
1008                                     1 << qp->sq.wqe_shift);
1009
1010         /*
1011          * If this is a userspace QP, we don't actually have to
1012          * allocate anything.  All we need is to calculate the WQE
1013          * sizes and the send_wqe_offset, so we're done now.
1014          */
1015         if (pd->ibpd.uobject)
1016                 return 0;
1017
1018         size = PAGE_ALIGN(qp->send_wqe_offset +
1019                           (qp->sq.max << qp->sq.wqe_shift));
1020
1021         qp->wrid = kmalloc((qp->rq.max + qp->sq.max) * sizeof (u64),
1022                            GFP_KERNEL);
1023         if (!qp->wrid)
1024                 goto err_out;
1025
1026         err = mthca_buf_alloc(dev, size, MTHCA_MAX_DIRECT_QP_SIZE,
1027                               &qp->queue, &qp->is_direct, pd, 0, &qp->mr);
1028         if (err)
1029                 goto err_out;
1030
1031         return 0;
1032
1033 err_out:
1034         kfree(qp->wrid);
1035         return err;
1036 }
1037
1038 static void mthca_free_wqe_buf(struct mthca_dev *dev,
1039                                struct mthca_qp *qp)
1040 {
1041         mthca_buf_free(dev, PAGE_ALIGN(qp->send_wqe_offset +
1042                                        (qp->sq.max << qp->sq.wqe_shift)),
1043                        &qp->queue, qp->is_direct, &qp->mr);
1044         kfree(qp->wrid);
1045 }
1046
1047 static int mthca_map_memfree(struct mthca_dev *dev,
1048                              struct mthca_qp *qp)
1049 {
1050         int ret;
1051
1052         if (mthca_is_memfree(dev)) {
1053                 ret = mthca_table_get(dev, dev->qp_table.qp_table, qp->qpn);
1054                 if (ret)
1055                         return ret;
1056
1057                 ret = mthca_table_get(dev, dev->qp_table.eqp_table, qp->qpn);
1058                 if (ret)
1059                         goto err_qpc;
1060
1061                 ret = mthca_table_get(dev, dev->qp_table.rdb_table,
1062                                       qp->qpn << dev->qp_table.rdb_shift);
1063                 if (ret)
1064                         goto err_eqpc;
1065
1066         }
1067
1068         return 0;
1069
1070 err_eqpc:
1071         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1072
1073 err_qpc:
1074         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1075
1076         return ret;
1077 }
1078
1079 static void mthca_unmap_memfree(struct mthca_dev *dev,
1080                                 struct mthca_qp *qp)
1081 {
1082         mthca_table_put(dev, dev->qp_table.rdb_table,
1083                         qp->qpn << dev->qp_table.rdb_shift);
1084         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1085         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1086 }
1087
1088 static int mthca_alloc_memfree(struct mthca_dev *dev,
1089                                struct mthca_qp *qp)
1090 {
1091         int ret = 0;
1092
1093         if (mthca_is_memfree(dev)) {
1094                 qp->rq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_RQ,
1095                                                  qp->qpn, &qp->rq.db);
1096                 if (qp->rq.db_index < 0)
1097                         return ret;
1098
1099                 qp->sq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SQ,
1100                                                  qp->qpn, &qp->sq.db);
1101                 if (qp->sq.db_index < 0)
1102                         mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1103         }
1104
1105         return ret;
1106 }
1107
1108 static void mthca_free_memfree(struct mthca_dev *dev,
1109                                struct mthca_qp *qp)
1110 {
1111         if (mthca_is_memfree(dev)) {
1112                 mthca_free_db(dev, MTHCA_DB_TYPE_SQ, qp->sq.db_index);
1113                 mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1114         }
1115 }
1116
1117 static int mthca_alloc_qp_common(struct mthca_dev *dev,
1118                                  struct mthca_pd *pd,
1119                                  struct mthca_cq *send_cq,
1120                                  struct mthca_cq *recv_cq,
1121                                  enum ib_sig_type send_policy,
1122                                  struct mthca_qp *qp)
1123 {
1124         int ret;
1125         int i;
1126
1127         qp->refcount = 1;
1128         init_waitqueue_head(&qp->wait);
1129         mutex_init(&qp->mutex);
1130         qp->state        = IB_QPS_RESET;
1131         qp->atomic_rd_en = 0;
1132         qp->resp_depth   = 0;
1133         qp->sq_policy    = send_policy;
1134         mthca_wq_reset(&qp->sq);
1135         mthca_wq_reset(&qp->rq);
1136
1137         spin_lock_init(&qp->sq.lock);
1138         spin_lock_init(&qp->rq.lock);
1139
1140         ret = mthca_map_memfree(dev, qp);
1141         if (ret)
1142                 return ret;
1143
1144         ret = mthca_alloc_wqe_buf(dev, pd, qp);
1145         if (ret) {
1146                 mthca_unmap_memfree(dev, qp);
1147                 return ret;
1148         }
1149
1150         mthca_adjust_qp_caps(dev, pd, qp);
1151
1152         /*
1153          * If this is a userspace QP, we're done now.  The doorbells
1154          * will be allocated and buffers will be initialized in
1155          * userspace.
1156          */
1157         if (pd->ibpd.uobject)
1158                 return 0;
1159
1160         ret = mthca_alloc_memfree(dev, qp);
1161         if (ret) {
1162                 mthca_free_wqe_buf(dev, qp);
1163                 mthca_unmap_memfree(dev, qp);
1164                 return ret;
1165         }
1166
1167         if (mthca_is_memfree(dev)) {
1168                 struct mthca_next_seg *next;
1169                 struct mthca_data_seg *scatter;
1170                 int size = (sizeof (struct mthca_next_seg) +
1171                             qp->rq.max_gs * sizeof (struct mthca_data_seg)) / 16;
1172
1173                 for (i = 0; i < qp->rq.max; ++i) {
1174                         next = get_recv_wqe(qp, i);
1175                         next->nda_op = cpu_to_be32(((i + 1) & (qp->rq.max - 1)) <<
1176                                                    qp->rq.wqe_shift);
1177                         next->ee_nds = cpu_to_be32(size);
1178
1179                         for (scatter = (void *) (next + 1);
1180                              (void *) scatter < (void *) next + (1 << qp->rq.wqe_shift);
1181                              ++scatter)
1182                                 scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
1183                 }
1184
1185                 for (i = 0; i < qp->sq.max; ++i) {
1186                         next = get_send_wqe(qp, i);
1187                         next->nda_op = cpu_to_be32((((i + 1) & (qp->sq.max - 1)) <<
1188                                                     qp->sq.wqe_shift) +
1189                                                    qp->send_wqe_offset);
1190                 }
1191         }
1192
1193         qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
1194         qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
1195
1196         return 0;
1197 }
1198
1199 static int mthca_set_qp_size(struct mthca_dev *dev, struct ib_qp_cap *cap,
1200                              struct mthca_pd *pd, struct mthca_qp *qp)
1201 {
1202         int max_data_size = mthca_max_data_size(dev, qp, dev->limits.max_desc_sz);
1203
1204         /* Sanity check QP size before proceeding */
1205         if (cap->max_send_wr     > dev->limits.max_wqes ||
1206             cap->max_recv_wr     > dev->limits.max_wqes ||
1207             cap->max_send_sge    > dev->limits.max_sg   ||
1208             cap->max_recv_sge    > dev->limits.max_sg   ||
1209             cap->max_inline_data > mthca_max_inline_data(pd, max_data_size))
1210                 return -EINVAL;
1211
1212         /*
1213          * For MLX transport we need 2 extra S/G entries:
1214          * one for the header and one for the checksum at the end
1215          */
1216         if (qp->transport == MLX && cap->max_recv_sge + 2 > dev->limits.max_sg)
1217                 return -EINVAL;
1218
1219         if (mthca_is_memfree(dev)) {
1220                 qp->rq.max = cap->max_recv_wr ?
1221                         roundup_pow_of_two(cap->max_recv_wr) : 0;
1222                 qp->sq.max = cap->max_send_wr ?
1223                         roundup_pow_of_two(cap->max_send_wr) : 0;
1224         } else {
1225                 qp->rq.max = cap->max_recv_wr;
1226                 qp->sq.max = cap->max_send_wr;
1227         }
1228
1229         qp->rq.max_gs = cap->max_recv_sge;
1230         qp->sq.max_gs = max_t(int, cap->max_send_sge,
1231                               ALIGN(cap->max_inline_data + MTHCA_INLINE_HEADER_SIZE,
1232                                     MTHCA_INLINE_CHUNK_SIZE) /
1233                               sizeof (struct mthca_data_seg));
1234
1235         return 0;
1236 }
1237
1238 int mthca_alloc_qp(struct mthca_dev *dev,
1239                    struct mthca_pd *pd,
1240                    struct mthca_cq *send_cq,
1241                    struct mthca_cq *recv_cq,
1242                    enum ib_qp_type type,
1243                    enum ib_sig_type send_policy,
1244                    struct ib_qp_cap *cap,
1245                    struct mthca_qp *qp)
1246 {
1247         int err;
1248
1249         switch (type) {
1250         case IB_QPT_RC: qp->transport = RC; break;
1251         case IB_QPT_UC: qp->transport = UC; break;
1252         case IB_QPT_UD: qp->transport = UD; break;
1253         default: return -EINVAL;
1254         }
1255
1256         err = mthca_set_qp_size(dev, cap, pd, qp);
1257         if (err)
1258                 return err;
1259
1260         qp->qpn = mthca_alloc(&dev->qp_table.alloc);
1261         if (qp->qpn == -1)
1262                 return -ENOMEM;
1263
1264         /* initialize port to zero for error-catching. */
1265         qp->port = 0;
1266
1267         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1268                                     send_policy, qp);
1269         if (err) {
1270                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1271                 return err;
1272         }
1273
1274         spin_lock_irq(&dev->qp_table.lock);
1275         mthca_array_set(&dev->qp_table.qp,
1276                         qp->qpn & (dev->limits.num_qps - 1), qp);
1277         spin_unlock_irq(&dev->qp_table.lock);
1278
1279         return 0;
1280 }
1281
1282 static void mthca_lock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq)
1283 {
1284         if (send_cq == recv_cq)
1285                 spin_lock_irq(&send_cq->lock);
1286         else if (send_cq->cqn < recv_cq->cqn) {
1287                 spin_lock_irq(&send_cq->lock);
1288                 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
1289         } else {
1290                 spin_lock_irq(&recv_cq->lock);
1291                 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
1292         }
1293 }
1294
1295 static void mthca_unlock_cqs(struct mthca_cq *send_cq, struct mthca_cq *recv_cq)
1296 {
1297         if (send_cq == recv_cq)
1298                 spin_unlock_irq(&send_cq->lock);
1299         else if (send_cq->cqn < recv_cq->cqn) {
1300                 spin_unlock(&recv_cq->lock);
1301                 spin_unlock_irq(&send_cq->lock);
1302         } else {
1303                 spin_unlock(&send_cq->lock);
1304                 spin_unlock_irq(&recv_cq->lock);
1305         }
1306 }
1307
1308 int mthca_alloc_sqp(struct mthca_dev *dev,
1309                     struct mthca_pd *pd,
1310                     struct mthca_cq *send_cq,
1311                     struct mthca_cq *recv_cq,
1312                     enum ib_sig_type send_policy,
1313                     struct ib_qp_cap *cap,
1314                     int qpn,
1315                     int port,
1316                     struct mthca_sqp *sqp)
1317 {
1318         u32 mqpn = qpn * 2 + dev->qp_table.sqp_start + port - 1;
1319         int err;
1320
1321         sqp->qp.transport = MLX;
1322         err = mthca_set_qp_size(dev, cap, pd, &sqp->qp);
1323         if (err)
1324                 return err;
1325
1326         sqp->header_buf_size = sqp->qp.sq.max * MTHCA_UD_HEADER_SIZE;
1327         sqp->header_buf = dma_alloc_coherent(&dev->pdev->dev, sqp->header_buf_size,
1328                                              &sqp->header_dma, GFP_KERNEL);
1329         if (!sqp->header_buf)
1330                 return -ENOMEM;
1331
1332         spin_lock_irq(&dev->qp_table.lock);
1333         if (mthca_array_get(&dev->qp_table.qp, mqpn))
1334                 err = -EBUSY;
1335         else
1336                 mthca_array_set(&dev->qp_table.qp, mqpn, sqp);
1337         spin_unlock_irq(&dev->qp_table.lock);
1338
1339         if (err)
1340                 goto err_out;
1341
1342         sqp->qp.port      = port;
1343         sqp->qp.qpn       = mqpn;
1344         sqp->qp.transport = MLX;
1345
1346         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1347                                     send_policy, &sqp->qp);
1348         if (err)
1349                 goto err_out_free;
1350
1351         atomic_inc(&pd->sqp_count);
1352
1353         return 0;
1354
1355  err_out_free:
1356         /*
1357          * Lock CQs here, so that CQ polling code can do QP lookup
1358          * without taking a lock.
1359          */
1360         mthca_lock_cqs(send_cq, recv_cq);
1361
1362         spin_lock(&dev->qp_table.lock);
1363         mthca_array_clear(&dev->qp_table.qp, mqpn);
1364         spin_unlock(&dev->qp_table.lock);
1365
1366         mthca_unlock_cqs(send_cq, recv_cq);
1367
1368  err_out:
1369         dma_free_coherent(&dev->pdev->dev, sqp->header_buf_size,
1370                           sqp->header_buf, sqp->header_dma);
1371
1372         return err;
1373 }
1374
1375 static inline int get_qp_refcount(struct mthca_dev *dev, struct mthca_qp *qp)
1376 {
1377         int c;
1378
1379         spin_lock_irq(&dev->qp_table.lock);
1380         c = qp->refcount;
1381         spin_unlock_irq(&dev->qp_table.lock);
1382
1383         return c;
1384 }
1385
1386 void mthca_free_qp(struct mthca_dev *dev,
1387                    struct mthca_qp *qp)
1388 {
1389         u8 status;
1390         struct mthca_cq *send_cq;
1391         struct mthca_cq *recv_cq;
1392
1393         send_cq = to_mcq(qp->ibqp.send_cq);
1394         recv_cq = to_mcq(qp->ibqp.recv_cq);
1395
1396         /*
1397          * Lock CQs here, so that CQ polling code can do QP lookup
1398          * without taking a lock.
1399          */
1400         mthca_lock_cqs(send_cq, recv_cq);
1401
1402         spin_lock(&dev->qp_table.lock);
1403         mthca_array_clear(&dev->qp_table.qp,
1404                           qp->qpn & (dev->limits.num_qps - 1));
1405         --qp->refcount;
1406         spin_unlock(&dev->qp_table.lock);
1407
1408         mthca_unlock_cqs(send_cq, recv_cq);
1409
1410         wait_event(qp->wait, !get_qp_refcount(dev, qp));
1411
1412         if (qp->state != IB_QPS_RESET)
1413                 mthca_MODIFY_QP(dev, qp->state, IB_QPS_RESET, qp->qpn, 0,
1414                                 NULL, 0, &status);
1415
1416         /*
1417          * If this is a userspace QP, the buffers, MR, CQs and so on
1418          * will be cleaned up in userspace, so all we have to do is
1419          * unref the mem-free tables and free the QPN in our table.
1420          */
1421         if (!qp->ibqp.uobject) {
1422                 mthca_cq_clean(dev, to_mcq(qp->ibqp.send_cq), qp->qpn,
1423                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
1424                 if (qp->ibqp.send_cq != qp->ibqp.recv_cq)
1425                         mthca_cq_clean(dev, to_mcq(qp->ibqp.recv_cq), qp->qpn,
1426                                        qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
1427
1428                 mthca_free_memfree(dev, qp);
1429                 mthca_free_wqe_buf(dev, qp);
1430         }
1431
1432         mthca_unmap_memfree(dev, qp);
1433
1434         if (is_sqp(dev, qp)) {
1435                 atomic_dec(&(to_mpd(qp->ibqp.pd)->sqp_count));
1436                 dma_free_coherent(&dev->pdev->dev,
1437                                   to_msqp(qp)->header_buf_size,
1438                                   to_msqp(qp)->header_buf,
1439                                   to_msqp(qp)->header_dma);
1440         } else
1441                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1442 }
1443
1444 /* Create UD header for an MLX send and build a data segment for it */
1445 static int build_mlx_header(struct mthca_dev *dev, struct mthca_sqp *sqp,
1446                             int ind, struct ib_send_wr *wr,
1447                             struct mthca_mlx_seg *mlx,
1448                             struct mthca_data_seg *data)
1449 {
1450         int header_size;
1451         int err;
1452         u16 pkey;
1453
1454         ib_ud_header_init(256, /* assume a MAD */
1455                           mthca_ah_grh_present(to_mah(wr->wr.ud.ah)),
1456                           &sqp->ud_header);
1457
1458         err = mthca_read_ah(dev, to_mah(wr->wr.ud.ah), &sqp->ud_header);
1459         if (err)
1460                 return err;
1461         mlx->flags &= ~cpu_to_be32(MTHCA_NEXT_SOLICIT | 1);
1462         mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MTHCA_MLX_VL15 : 0) |
1463                                   (sqp->ud_header.lrh.destination_lid ==
1464                                    IB_LID_PERMISSIVE ? MTHCA_MLX_SLR : 0) |
1465                                   (sqp->ud_header.lrh.service_level << 8));
1466         mlx->rlid = sqp->ud_header.lrh.destination_lid;
1467         mlx->vcrc = 0;
1468
1469         switch (wr->opcode) {
1470         case IB_WR_SEND:
1471                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1472                 sqp->ud_header.immediate_present = 0;
1473                 break;
1474         case IB_WR_SEND_WITH_IMM:
1475                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1476                 sqp->ud_header.immediate_present = 1;
1477                 sqp->ud_header.immediate_data = wr->imm_data;
1478                 break;
1479         default:
1480                 return -EINVAL;
1481         }
1482
1483         sqp->ud_header.lrh.virtual_lane    = !sqp->qp.ibqp.qp_num ? 15 : 0;
1484         if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1485                 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1486         sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1487         if (!sqp->qp.ibqp.qp_num)
1488                 ib_get_cached_pkey(&dev->ib_dev, sqp->qp.port,
1489                                    sqp->pkey_index, &pkey);
1490         else
1491                 ib_get_cached_pkey(&dev->ib_dev, sqp->qp.port,
1492                                    wr->wr.ud.pkey_index, &pkey);
1493         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1494         sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1495         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1496         sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1497                                                sqp->qkey : wr->wr.ud.remote_qkey);
1498         sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1499
1500         header_size = ib_ud_header_pack(&sqp->ud_header,
1501                                         sqp->header_buf +
1502                                         ind * MTHCA_UD_HEADER_SIZE);
1503
1504         data->byte_count = cpu_to_be32(header_size);
1505         data->lkey       = cpu_to_be32(to_mpd(sqp->qp.ibqp.pd)->ntmr.ibmr.lkey);
1506         data->addr       = cpu_to_be64(sqp->header_dma +
1507                                        ind * MTHCA_UD_HEADER_SIZE);
1508
1509         return 0;
1510 }
1511
1512 static inline int mthca_wq_overflow(struct mthca_wq *wq, int nreq,
1513                                     struct ib_cq *ib_cq)
1514 {
1515         unsigned cur;
1516         struct mthca_cq *cq;
1517
1518         cur = wq->head - wq->tail;
1519         if (likely(cur + nreq < wq->max))
1520                 return 0;
1521
1522         cq = to_mcq(ib_cq);
1523         spin_lock(&cq->lock);
1524         cur = wq->head - wq->tail;
1525         spin_unlock(&cq->lock);
1526
1527         return cur + nreq >= wq->max;
1528 }
1529
1530 int mthca_tavor_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1531                           struct ib_send_wr **bad_wr)
1532 {
1533         struct mthca_dev *dev = to_mdev(ibqp->device);
1534         struct mthca_qp *qp = to_mqp(ibqp);
1535         void *wqe;
1536         void *prev_wqe;
1537         unsigned long flags;
1538         int err = 0;
1539         int nreq;
1540         int i;
1541         int size;
1542         int size0 = 0;
1543         u32 f0;
1544         int ind;
1545         u8 op0 = 0;
1546
1547         spin_lock_irqsave(&qp->sq.lock, flags);
1548
1549         /* XXX check that state is OK to post send */
1550
1551         ind = qp->sq.next_ind;
1552
1553         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1554                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1555                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1556                                         " %d max, %d nreq)\n", qp->qpn,
1557                                         qp->sq.head, qp->sq.tail,
1558                                         qp->sq.max, nreq);
1559                         err = -ENOMEM;
1560                         *bad_wr = wr;
1561                         goto out;
1562                 }
1563
1564                 wqe = get_send_wqe(qp, ind);
1565                 prev_wqe = qp->sq.last;
1566                 qp->sq.last = wqe;
1567
1568                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
1569                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
1570                 ((struct mthca_next_seg *) wqe)->flags =
1571                         ((wr->send_flags & IB_SEND_SIGNALED) ?
1572                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
1573                         ((wr->send_flags & IB_SEND_SOLICITED) ?
1574                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
1575                         cpu_to_be32(1);
1576                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1577                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1578                         ((struct mthca_next_seg *) wqe)->imm = wr->imm_data;
1579
1580                 wqe += sizeof (struct mthca_next_seg);
1581                 size = sizeof (struct mthca_next_seg) / 16;
1582
1583                 switch (qp->transport) {
1584                 case RC:
1585                         switch (wr->opcode) {
1586                         case IB_WR_ATOMIC_CMP_AND_SWP:
1587                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1588                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1589                                         cpu_to_be64(wr->wr.atomic.remote_addr);
1590                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1591                                         cpu_to_be32(wr->wr.atomic.rkey);
1592                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1593
1594                                 wqe += sizeof (struct mthca_raddr_seg);
1595
1596                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1597                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1598                                                 cpu_to_be64(wr->wr.atomic.swap);
1599                                         ((struct mthca_atomic_seg *) wqe)->compare =
1600                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1601                                 } else {
1602                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1603                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1604                                         ((struct mthca_atomic_seg *) wqe)->compare = 0;
1605                                 }
1606
1607                                 wqe += sizeof (struct mthca_atomic_seg);
1608                                 size += (sizeof (struct mthca_raddr_seg) +
1609                                          sizeof (struct mthca_atomic_seg)) / 16;
1610                                 break;
1611
1612                         case IB_WR_RDMA_WRITE:
1613                         case IB_WR_RDMA_WRITE_WITH_IMM:
1614                         case IB_WR_RDMA_READ:
1615                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1616                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1617                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1618                                         cpu_to_be32(wr->wr.rdma.rkey);
1619                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1620                                 wqe += sizeof (struct mthca_raddr_seg);
1621                                 size += sizeof (struct mthca_raddr_seg) / 16;
1622                                 break;
1623
1624                         default:
1625                                 /* No extra segments required for sends */
1626                                 break;
1627                         }
1628
1629                         break;
1630
1631                 case UC:
1632                         switch (wr->opcode) {
1633                         case IB_WR_RDMA_WRITE:
1634                         case IB_WR_RDMA_WRITE_WITH_IMM:
1635                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1636                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1637                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1638                                         cpu_to_be32(wr->wr.rdma.rkey);
1639                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1640                                 wqe += sizeof (struct mthca_raddr_seg);
1641                                 size += sizeof (struct mthca_raddr_seg) / 16;
1642                                 break;
1643
1644                         default:
1645                                 /* No extra segments required for sends */
1646                                 break;
1647                         }
1648
1649                         break;
1650
1651                 case UD:
1652                         ((struct mthca_tavor_ud_seg *) wqe)->lkey =
1653                                 cpu_to_be32(to_mah(wr->wr.ud.ah)->key);
1654                         ((struct mthca_tavor_ud_seg *) wqe)->av_addr =
1655                                 cpu_to_be64(to_mah(wr->wr.ud.ah)->avdma);
1656                         ((struct mthca_tavor_ud_seg *) wqe)->dqpn =
1657                                 cpu_to_be32(wr->wr.ud.remote_qpn);
1658                         ((struct mthca_tavor_ud_seg *) wqe)->qkey =
1659                                 cpu_to_be32(wr->wr.ud.remote_qkey);
1660
1661                         wqe += sizeof (struct mthca_tavor_ud_seg);
1662                         size += sizeof (struct mthca_tavor_ud_seg) / 16;
1663                         break;
1664
1665                 case MLX:
1666                         err = build_mlx_header(dev, to_msqp(qp), ind, wr,
1667                                                wqe - sizeof (struct mthca_next_seg),
1668                                                wqe);
1669                         if (err) {
1670                                 *bad_wr = wr;
1671                                 goto out;
1672                         }
1673                         wqe += sizeof (struct mthca_data_seg);
1674                         size += sizeof (struct mthca_data_seg) / 16;
1675                         break;
1676                 }
1677
1678                 if (wr->num_sge > qp->sq.max_gs) {
1679                         mthca_err(dev, "too many gathers\n");
1680                         err = -EINVAL;
1681                         *bad_wr = wr;
1682                         goto out;
1683                 }
1684
1685                 for (i = 0; i < wr->num_sge; ++i) {
1686                         ((struct mthca_data_seg *) wqe)->byte_count =
1687                                 cpu_to_be32(wr->sg_list[i].length);
1688                         ((struct mthca_data_seg *) wqe)->lkey =
1689                                 cpu_to_be32(wr->sg_list[i].lkey);
1690                         ((struct mthca_data_seg *) wqe)->addr =
1691                                 cpu_to_be64(wr->sg_list[i].addr);
1692                         wqe += sizeof (struct mthca_data_seg);
1693                         size += sizeof (struct mthca_data_seg) / 16;
1694                 }
1695
1696                 /* Add one more inline data segment for ICRC */
1697                 if (qp->transport == MLX) {
1698                         ((struct mthca_data_seg *) wqe)->byte_count =
1699                                 cpu_to_be32((1 << 31) | 4);
1700                         ((u32 *) wqe)[1] = 0;
1701                         wqe += sizeof (struct mthca_data_seg);
1702                         size += sizeof (struct mthca_data_seg) / 16;
1703                 }
1704
1705                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
1706
1707                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
1708                         mthca_err(dev, "opcode invalid\n");
1709                         err = -EINVAL;
1710                         *bad_wr = wr;
1711                         goto out;
1712                 }
1713
1714                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1715                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
1716                                      qp->send_wqe_offset) |
1717                                     mthca_opcode[wr->opcode]);
1718                 wmb();
1719                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1720                         cpu_to_be32((size0 ? 0 : MTHCA_NEXT_DBD) | size |
1721                                     ((wr->send_flags & IB_SEND_FENCE) ?
1722                                     MTHCA_NEXT_FENCE : 0));
1723
1724                 if (!size0) {
1725                         size0 = size;
1726                         op0   = mthca_opcode[wr->opcode];
1727                         f0    = wr->send_flags & IB_SEND_FENCE ?
1728                                 MTHCA_SEND_DOORBELL_FENCE : 0;
1729                 }
1730
1731                 ++ind;
1732                 if (unlikely(ind >= qp->sq.max))
1733                         ind -= qp->sq.max;
1734         }
1735
1736 out:
1737         if (likely(nreq)) {
1738                 __be32 doorbell[2];
1739
1740                 doorbell[0] = cpu_to_be32(((qp->sq.next_ind << qp->sq.wqe_shift) +
1741                                            qp->send_wqe_offset) | f0 | op0);
1742                 doorbell[1] = cpu_to_be32((qp->qpn << 8) | size0);
1743
1744                 wmb();
1745
1746                 mthca_write64(doorbell,
1747                               dev->kar + MTHCA_SEND_DOORBELL,
1748                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1749                 /*
1750                  * Make sure doorbells don't leak out of SQ spinlock
1751                  * and reach the HCA out of order:
1752                  */
1753                 mmiowb();
1754         }
1755
1756         qp->sq.next_ind = ind;
1757         qp->sq.head    += nreq;
1758
1759         spin_unlock_irqrestore(&qp->sq.lock, flags);
1760         return err;
1761 }
1762
1763 int mthca_tavor_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1764                              struct ib_recv_wr **bad_wr)
1765 {
1766         struct mthca_dev *dev = to_mdev(ibqp->device);
1767         struct mthca_qp *qp = to_mqp(ibqp);
1768         __be32 doorbell[2];
1769         unsigned long flags;
1770         int err = 0;
1771         int nreq;
1772         int i;
1773         int size;
1774         int size0 = 0;
1775         int ind;
1776         void *wqe;
1777         void *prev_wqe;
1778
1779         spin_lock_irqsave(&qp->rq.lock, flags);
1780
1781         /* XXX check that state is OK to post receive */
1782
1783         ind = qp->rq.next_ind;
1784
1785         for (nreq = 0; wr; wr = wr->next) {
1786                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1787                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
1788                                         " %d max, %d nreq)\n", qp->qpn,
1789                                         qp->rq.head, qp->rq.tail,
1790                                         qp->rq.max, nreq);
1791                         err = -ENOMEM;
1792                         *bad_wr = wr;
1793                         goto out;
1794                 }
1795
1796                 wqe = get_recv_wqe(qp, ind);
1797                 prev_wqe = qp->rq.last;
1798                 qp->rq.last = wqe;
1799
1800                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
1801                 ((struct mthca_next_seg *) wqe)->ee_nds =
1802                         cpu_to_be32(MTHCA_NEXT_DBD);
1803                 ((struct mthca_next_seg *) wqe)->flags = 0;
1804
1805                 wqe += sizeof (struct mthca_next_seg);
1806                 size = sizeof (struct mthca_next_seg) / 16;
1807
1808                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1809                         err = -EINVAL;
1810                         *bad_wr = wr;
1811                         goto out;
1812                 }
1813
1814                 for (i = 0; i < wr->num_sge; ++i) {
1815                         ((struct mthca_data_seg *) wqe)->byte_count =
1816                                 cpu_to_be32(wr->sg_list[i].length);
1817                         ((struct mthca_data_seg *) wqe)->lkey =
1818                                 cpu_to_be32(wr->sg_list[i].lkey);
1819                         ((struct mthca_data_seg *) wqe)->addr =
1820                                 cpu_to_be64(wr->sg_list[i].addr);
1821                         wqe += sizeof (struct mthca_data_seg);
1822                         size += sizeof (struct mthca_data_seg) / 16;
1823                 }
1824
1825                 qp->wrid[ind] = wr->wr_id;
1826
1827                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1828                         cpu_to_be32((ind << qp->rq.wqe_shift) | 1);
1829                 wmb();
1830                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1831                         cpu_to_be32(MTHCA_NEXT_DBD | size);
1832
1833                 if (!size0)
1834                         size0 = size;
1835
1836                 ++ind;
1837                 if (unlikely(ind >= qp->rq.max))
1838                         ind -= qp->rq.max;
1839
1840                 ++nreq;
1841                 if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
1842                         nreq = 0;
1843
1844                         doorbell[0] = cpu_to_be32((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
1845                         doorbell[1] = cpu_to_be32(qp->qpn << 8);
1846
1847                         wmb();
1848
1849                         mthca_write64(doorbell,
1850                                       dev->kar + MTHCA_RECEIVE_DOORBELL,
1851                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1852
1853                         qp->rq.head += MTHCA_TAVOR_MAX_WQES_PER_RECV_DB;
1854                         size0 = 0;
1855                 }
1856         }
1857
1858 out:
1859         if (likely(nreq)) {
1860                 doorbell[0] = cpu_to_be32((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
1861                 doorbell[1] = cpu_to_be32((qp->qpn << 8) | nreq);
1862
1863                 wmb();
1864
1865                 mthca_write64(doorbell,
1866                               dev->kar + MTHCA_RECEIVE_DOORBELL,
1867                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1868         }
1869
1870         qp->rq.next_ind = ind;
1871         qp->rq.head    += nreq;
1872
1873         /*
1874          * Make sure doorbells don't leak out of RQ spinlock and reach
1875          * the HCA out of order:
1876          */
1877         mmiowb();
1878
1879         spin_unlock_irqrestore(&qp->rq.lock, flags);
1880         return err;
1881 }
1882
1883 int mthca_arbel_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1884                           struct ib_send_wr **bad_wr)
1885 {
1886         struct mthca_dev *dev = to_mdev(ibqp->device);
1887         struct mthca_qp *qp = to_mqp(ibqp);
1888         __be32 doorbell[2];
1889         void *wqe;
1890         void *prev_wqe;
1891         unsigned long flags;
1892         int err = 0;
1893         int nreq;
1894         int i;
1895         int size;
1896         int size0 = 0;
1897         u32 f0;
1898         int ind;
1899         u8 op0 = 0;
1900
1901         spin_lock_irqsave(&qp->sq.lock, flags);
1902
1903         /* XXX check that state is OK to post send */
1904
1905         ind = qp->sq.head & (qp->sq.max - 1);
1906
1907         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1908                 if (unlikely(nreq == MTHCA_ARBEL_MAX_WQES_PER_SEND_DB)) {
1909                         nreq = 0;
1910
1911                         doorbell[0] = cpu_to_be32((MTHCA_ARBEL_MAX_WQES_PER_SEND_DB << 24) |
1912                                                   ((qp->sq.head & 0xffff) << 8) |
1913                                                   f0 | op0);
1914                         doorbell[1] = cpu_to_be32((qp->qpn << 8) | size0);
1915
1916                         qp->sq.head += MTHCA_ARBEL_MAX_WQES_PER_SEND_DB;
1917                         size0 = 0;
1918
1919                         /*
1920                          * Make sure that descriptors are written before
1921                          * doorbell record.
1922                          */
1923                         wmb();
1924                         *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
1925
1926                         /*
1927                          * Make sure doorbell record is written before we
1928                          * write MMIO send doorbell.
1929                          */
1930                         wmb();
1931                         mthca_write64(doorbell,
1932                                       dev->kar + MTHCA_SEND_DOORBELL,
1933                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1934                 }
1935
1936                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1937                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1938                                         " %d max, %d nreq)\n", qp->qpn,
1939                                         qp->sq.head, qp->sq.tail,
1940                                         qp->sq.max, nreq);
1941                         err = -ENOMEM;
1942                         *bad_wr = wr;
1943                         goto out;
1944                 }
1945
1946                 wqe = get_send_wqe(qp, ind);
1947                 prev_wqe = qp->sq.last;
1948                 qp->sq.last = wqe;
1949
1950                 ((struct mthca_next_seg *) wqe)->flags =
1951                         ((wr->send_flags & IB_SEND_SIGNALED) ?
1952                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
1953                         ((wr->send_flags & IB_SEND_SOLICITED) ?
1954                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
1955                         cpu_to_be32(1);
1956                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1957                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1958                         ((struct mthca_next_seg *) wqe)->imm = wr->imm_data;
1959
1960                 wqe += sizeof (struct mthca_next_seg);
1961                 size = sizeof (struct mthca_next_seg) / 16;
1962
1963                 switch (qp->transport) {
1964                 case RC:
1965                         switch (wr->opcode) {
1966                         case IB_WR_ATOMIC_CMP_AND_SWP:
1967                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1968                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1969                                         cpu_to_be64(wr->wr.atomic.remote_addr);
1970                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1971                                         cpu_to_be32(wr->wr.atomic.rkey);
1972                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1973
1974                                 wqe += sizeof (struct mthca_raddr_seg);
1975
1976                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1977                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1978                                                 cpu_to_be64(wr->wr.atomic.swap);
1979                                         ((struct mthca_atomic_seg *) wqe)->compare =
1980                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1981                                 } else {
1982                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1983                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1984                                         ((struct mthca_atomic_seg *) wqe)->compare = 0;
1985                                 }
1986
1987                                 wqe += sizeof (struct mthca_atomic_seg);
1988                                 size += (sizeof (struct mthca_raddr_seg) +
1989                                          sizeof (struct mthca_atomic_seg)) / 16;
1990                                 break;
1991
1992                         case IB_WR_RDMA_READ:
1993                         case IB_WR_RDMA_WRITE:
1994                         case IB_WR_RDMA_WRITE_WITH_IMM:
1995                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1996                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1997                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1998                                         cpu_to_be32(wr->wr.rdma.rkey);
1999                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
2000                                 wqe += sizeof (struct mthca_raddr_seg);
2001                                 size += sizeof (struct mthca_raddr_seg) / 16;
2002                                 break;
2003
2004                         default:
2005                                 /* No extra segments required for sends */
2006                                 break;
2007                         }
2008
2009                         break;
2010
2011                 case UC:
2012                         switch (wr->opcode) {
2013                         case IB_WR_RDMA_WRITE:
2014                         case IB_WR_RDMA_WRITE_WITH_IMM:
2015                                 ((struct mthca_raddr_seg *) wqe)->raddr =
2016                                         cpu_to_be64(wr->wr.rdma.remote_addr);
2017                                 ((struct mthca_raddr_seg *) wqe)->rkey =
2018                                         cpu_to_be32(wr->wr.rdma.rkey);
2019                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
2020                                 wqe += sizeof (struct mthca_raddr_seg);
2021                                 size += sizeof (struct mthca_raddr_seg) / 16;
2022                                 break;
2023
2024                         default:
2025                                 /* No extra segments required for sends */
2026                                 break;
2027                         }
2028
2029                         break;
2030
2031                 case UD:
2032                         memcpy(((struct mthca_arbel_ud_seg *) wqe)->av,
2033                                to_mah(wr->wr.ud.ah)->av, MTHCA_AV_SIZE);
2034                         ((struct mthca_arbel_ud_seg *) wqe)->dqpn =
2035                                 cpu_to_be32(wr->wr.ud.remote_qpn);
2036                         ((struct mthca_arbel_ud_seg *) wqe)->qkey =
2037                                 cpu_to_be32(wr->wr.ud.remote_qkey);
2038
2039                         wqe += sizeof (struct mthca_arbel_ud_seg);
2040                         size += sizeof (struct mthca_arbel_ud_seg) / 16;
2041                         break;
2042
2043                 case MLX:
2044                         err = build_mlx_header(dev, to_msqp(qp), ind, wr,
2045                                                wqe - sizeof (struct mthca_next_seg),
2046                                                wqe);
2047                         if (err) {
2048                                 *bad_wr = wr;
2049                                 goto out;
2050                         }
2051                         wqe += sizeof (struct mthca_data_seg);
2052                         size += sizeof (struct mthca_data_seg) / 16;
2053                         break;
2054                 }
2055
2056                 if (wr->num_sge > qp->sq.max_gs) {
2057                         mthca_err(dev, "too many gathers\n");
2058                         err = -EINVAL;
2059                         *bad_wr = wr;
2060                         goto out;
2061                 }
2062
2063                 for (i = 0; i < wr->num_sge; ++i) {
2064                         ((struct mthca_data_seg *) wqe)->byte_count =
2065                                 cpu_to_be32(wr->sg_list[i].length);
2066                         ((struct mthca_data_seg *) wqe)->lkey =
2067                                 cpu_to_be32(wr->sg_list[i].lkey);
2068                         ((struct mthca_data_seg *) wqe)->addr =
2069                                 cpu_to_be64(wr->sg_list[i].addr);
2070                         wqe += sizeof (struct mthca_data_seg);
2071                         size += sizeof (struct mthca_data_seg) / 16;
2072                 }
2073
2074                 /* Add one more inline data segment for ICRC */
2075                 if (qp->transport == MLX) {
2076                         ((struct mthca_data_seg *) wqe)->byte_count =
2077                                 cpu_to_be32((1 << 31) | 4);
2078                         ((u32 *) wqe)[1] = 0;
2079                         wqe += sizeof (struct mthca_data_seg);
2080                         size += sizeof (struct mthca_data_seg) / 16;
2081                 }
2082
2083                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
2084
2085                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
2086                         mthca_err(dev, "opcode invalid\n");
2087                         err = -EINVAL;
2088                         *bad_wr = wr;
2089                         goto out;
2090                 }
2091
2092                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
2093                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
2094                                      qp->send_wqe_offset) |
2095                                     mthca_opcode[wr->opcode]);
2096                 wmb();
2097                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
2098                         cpu_to_be32(MTHCA_NEXT_DBD | size |
2099                                     ((wr->send_flags & IB_SEND_FENCE) ?
2100                                      MTHCA_NEXT_FENCE : 0));
2101
2102                 if (!size0) {
2103                         size0 = size;
2104                         op0   = mthca_opcode[wr->opcode];
2105                         f0    = wr->send_flags & IB_SEND_FENCE ?
2106                                 MTHCA_SEND_DOORBELL_FENCE : 0;
2107                 }
2108
2109                 ++ind;
2110                 if (unlikely(ind >= qp->sq.max))
2111                         ind -= qp->sq.max;
2112         }
2113
2114 out:
2115         if (likely(nreq)) {
2116                 doorbell[0] = cpu_to_be32((nreq << 24)                  |
2117                                           ((qp->sq.head & 0xffff) << 8) |
2118                                           f0 | op0);
2119                 doorbell[1] = cpu_to_be32((qp->qpn << 8) | size0);
2120
2121                 qp->sq.head += nreq;
2122
2123                 /*
2124                  * Make sure that descriptors are written before
2125                  * doorbell record.
2126                  */
2127                 wmb();
2128                 *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
2129
2130                 /*
2131                  * Make sure doorbell record is written before we
2132                  * write MMIO send doorbell.
2133                  */
2134                 wmb();
2135                 mthca_write64(doorbell,
2136                               dev->kar + MTHCA_SEND_DOORBELL,
2137                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
2138         }
2139
2140         /*
2141          * Make sure doorbells don't leak out of SQ spinlock and reach
2142          * the HCA out of order:
2143          */
2144         mmiowb();
2145
2146         spin_unlock_irqrestore(&qp->sq.lock, flags);
2147         return err;
2148 }
2149
2150 int mthca_arbel_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
2151                              struct ib_recv_wr **bad_wr)
2152 {
2153         struct mthca_dev *dev = to_mdev(ibqp->device);
2154         struct mthca_qp *qp = to_mqp(ibqp);
2155         unsigned long flags;
2156         int err = 0;
2157         int nreq;
2158         int ind;
2159         int i;
2160         void *wqe;
2161
2162         spin_lock_irqsave(&qp->rq.lock, flags);
2163
2164         /* XXX check that state is OK to post receive */
2165
2166         ind = qp->rq.head & (qp->rq.max - 1);
2167
2168         for (nreq = 0; wr; ++nreq, wr = wr->next) {
2169                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
2170                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
2171                                         " %d max, %d nreq)\n", qp->qpn,
2172                                         qp->rq.head, qp->rq.tail,
2173                                         qp->rq.max, nreq);
2174                         err = -ENOMEM;
2175                         *bad_wr = wr;
2176                         goto out;
2177                 }
2178
2179                 wqe = get_recv_wqe(qp, ind);
2180
2181                 ((struct mthca_next_seg *) wqe)->flags = 0;
2182
2183                 wqe += sizeof (struct mthca_next_seg);
2184
2185                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
2186                         err = -EINVAL;
2187                         *bad_wr = wr;
2188                         goto out;
2189                 }
2190
2191                 for (i = 0; i < wr->num_sge; ++i) {
2192                         ((struct mthca_data_seg *) wqe)->byte_count =
2193                                 cpu_to_be32(wr->sg_list[i].length);
2194                         ((struct mthca_data_seg *) wqe)->lkey =
2195                                 cpu_to_be32(wr->sg_list[i].lkey);
2196                         ((struct mthca_data_seg *) wqe)->addr =
2197                                 cpu_to_be64(wr->sg_list[i].addr);
2198                         wqe += sizeof (struct mthca_data_seg);
2199                 }
2200
2201                 if (i < qp->rq.max_gs) {
2202                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
2203                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
2204                         ((struct mthca_data_seg *) wqe)->addr = 0;
2205                 }
2206
2207                 qp->wrid[ind] = wr->wr_id;
2208
2209                 ++ind;
2210                 if (unlikely(ind >= qp->rq.max))
2211                         ind -= qp->rq.max;
2212         }
2213 out:
2214         if (likely(nreq)) {
2215                 qp->rq.head += nreq;
2216
2217                 /*
2218                  * Make sure that descriptors are written before
2219                  * doorbell record.
2220                  */
2221                 wmb();
2222                 *qp->rq.db = cpu_to_be32(qp->rq.head & 0xffff);
2223         }
2224
2225         spin_unlock_irqrestore(&qp->rq.lock, flags);
2226         return err;
2227 }
2228
2229 void mthca_free_err_wqe(struct mthca_dev *dev, struct mthca_qp *qp, int is_send,
2230                         int index, int *dbd, __be32 *new_wqe)
2231 {
2232         struct mthca_next_seg *next;
2233
2234         /*
2235          * For SRQs, all WQEs generate a CQE, so we're always at the
2236          * end of the doorbell chain.
2237          */
2238         if (qp->ibqp.srq) {
2239                 *new_wqe = 0;
2240                 return;
2241         }
2242
2243         if (is_send)
2244                 next = get_send_wqe(qp, index);
2245         else
2246                 next = get_recv_wqe(qp, index);
2247
2248         *dbd = !!(next->ee_nds & cpu_to_be32(MTHCA_NEXT_DBD));
2249         if (next->ee_nds & cpu_to_be32(0x3f))
2250                 *new_wqe = (next->nda_op & cpu_to_be32(~0x3f)) |
2251                         (next->ee_nds & cpu_to_be32(0x3f));
2252         else
2253                 *new_wqe = 0;
2254 }
2255
2256 int mthca_init_qp_table(struct mthca_dev *dev)
2257 {
2258         int err;
2259         u8 status;
2260         int i;
2261
2262         spin_lock_init(&dev->qp_table.lock);
2263
2264         /*
2265          * We reserve 2 extra QPs per port for the special QPs.  The
2266          * special QP for port 1 has to be even, so round up.
2267          */
2268         dev->qp_table.sqp_start = (dev->limits.reserved_qps + 1) & ~1UL;
2269         err = mthca_alloc_init(&dev->qp_table.alloc,
2270                                dev->limits.num_qps,
2271                                (1 << 24) - 1,
2272                                dev->qp_table.sqp_start +
2273                                MTHCA_MAX_PORTS * 2);
2274         if (err)
2275                 return err;
2276
2277         err = mthca_array_init(&dev->qp_table.qp,
2278                                dev->limits.num_qps);
2279         if (err) {
2280                 mthca_alloc_cleanup(&dev->qp_table.alloc);
2281                 return err;
2282         }
2283
2284         for (i = 0; i < 2; ++i) {
2285                 err = mthca_CONF_SPECIAL_QP(dev, i ? IB_QPT_GSI : IB_QPT_SMI,
2286                                             dev->qp_table.sqp_start + i * 2,
2287                                             &status);
2288                 if (err)
2289                         goto err_out;
2290                 if (status) {
2291                         mthca_warn(dev, "CONF_SPECIAL_QP returned "
2292                                    "status %02x, aborting.\n",
2293                                    status);
2294                         err = -EINVAL;
2295                         goto err_out;
2296                 }
2297         }
2298         return 0;
2299
2300  err_out:
2301         for (i = 0; i < 2; ++i)
2302                 mthca_CONF_SPECIAL_QP(dev, i, 0, &status);
2303
2304         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2305         mthca_alloc_cleanup(&dev->qp_table.alloc);
2306
2307         return err;
2308 }
2309
2310 void mthca_cleanup_qp_table(struct mthca_dev *dev)
2311 {
2312         int i;
2313         u8 status;
2314
2315         for (i = 0; i < 2; ++i)
2316                 mthca_CONF_SPECIAL_QP(dev, i, 0, &status);
2317
2318         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2319         mthca_alloc_cleanup(&dev->qp_table.alloc);
2320 }