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/init.h>
  39 #include <linux/string.h>
  40 #include <linux/slab.h>
  41
  42 #include <rdma/ib_verbs.h>
  43 #include <rdma/ib_cache.h>
  44 #include <rdma/ib_pack.h>
  45
  46 #include "mthca_dev.h"
  47 #include "mthca_cmd.h"
  48 #include "mthca_memfree.h"
  49 #include "mthca_wqe.h"
  50
  51 enum {
  52         MTHCA_MAX_DIRECT_QP_SIZE = 4 * PAGE_SIZE,
  53         MTHCA_ACK_REQ_FREQ       = 10,
  54         MTHCA_FLIGHT_LIMIT       = 9,
  55         MTHCA_UD_HEADER_SIZE     = 72, /* largest UD header possible */
  56         MTHCA_INLINE_HEADER_SIZE = 4,  /* data segment overhead for inline */
  57         MTHCA_INLINE_CHUNK_SIZE  = 16  /* inline data segment chunk */
  58 };
  59
  60 enum {
  61         MTHCA_QP_STATE_RST  = 0,
  62         MTHCA_QP_STATE_INIT = 1,
  63         MTHCA_QP_STATE_RTR  = 2,
  64         MTHCA_QP_STATE_RTS  = 3,
  65         MTHCA_QP_STATE_SQE  = 4,
  66         MTHCA_QP_STATE_SQD  = 5,
  67         MTHCA_QP_STATE_ERR  = 6,
  68         MTHCA_QP_STATE_DRAINING = 7
  69 };
  70
  71 enum {
  72         MTHCA_QP_ST_RC  = 0x0,
  73         MTHCA_QP_ST_UC  = 0x1,
  74         MTHCA_QP_ST_RD  = 0x2,
  75         MTHCA_QP_ST_UD  = 0x3,
  76         MTHCA_QP_ST_MLX = 0x7
  77 };
  78
  79 enum {
  80         MTHCA_QP_PM_MIGRATED = 0x3,
  81         MTHCA_QP_PM_ARMED    = 0x0,
  82         MTHCA_QP_PM_REARM    = 0x1
  83 };
  84
  85 enum {
  86         /* qp_context flags */
  87         MTHCA_QP_BIT_DE  = 1 <<  8,
  88         /* params1 */
  89         MTHCA_QP_BIT_SRE = 1 << 15,
  90         MTHCA_QP_BIT_SWE = 1 << 14,
  91         MTHCA_QP_BIT_SAE = 1 << 13,
  92         MTHCA_QP_BIT_SIC = 1 <<  4,
  93         MTHCA_QP_BIT_SSC = 1 <<  3,
  94         /* params2 */
  95         MTHCA_QP_BIT_RRE = 1 << 15,
  96         MTHCA_QP_BIT_RWE = 1 << 14,
  97         MTHCA_QP_BIT_RAE = 1 << 13,
  98         MTHCA_QP_BIT_RIC = 1 <<  4,
  99         MTHCA_QP_BIT_RSC = 1 <<  3
 100 };
 101
 102 struct mthca_qp_path {
 103         __be32 port_pkey;
 104         u8     rnr_retry;
 105         u8     g_mylmc;
 106         __be16 rlid;
 107         u8     ackto;
 108         u8     mgid_index;
 109         u8     static_rate;
 110         u8     hop_limit;
 111         __be32 sl_tclass_flowlabel;
 112         u8     rgid[16];
 113 } __attribute__((packed));
 114
 115 struct mthca_qp_context {
 116         __be32 flags;
 117         __be32 tavor_sched_queue; /* Reserved on Arbel */
 118         u8     mtu_msgmax;
 119         u8     rq_size_stride;  /* Reserved on Tavor */
 120         u8     sq_size_stride;  /* Reserved on Tavor */
 121         u8     rlkey_arbel_sched_queue; /* Reserved on Tavor */
 122         __be32 usr_page;
 123         __be32 local_qpn;
 124         __be32 remote_qpn;
 125         u32    reserved1[2];
 126         struct mthca_qp_path pri_path;
 127         struct mthca_qp_path alt_path;
 128         __be32 rdd;
 129         __be32 pd;
 130         __be32 wqe_base;
 131         __be32 wqe_lkey;
 132         __be32 params1;
 133         __be32 reserved2;
 134         __be32 next_send_psn;
 135         __be32 cqn_snd;
 136         __be32 snd_wqe_base_l;  /* Next send WQE on Tavor */
 137         __be32 snd_db_index;    /* (debugging only entries) */
 138         __be32 last_acked_psn;
 139         __be32 ssn;
 140         __be32 params2;
 141         __be32 rnr_nextrecvpsn;
 142         __be32 ra_buff_indx;
 143         __be32 cqn_rcv;
 144         __be32 rcv_wqe_base_l;  /* Next recv WQE on Tavor */
 145         __be32 rcv_db_index;    /* (debugging only entries) */
 146         __be32 qkey;
 147         __be32 srqn;
 148         __be32 rmsn;
 149         __be16 rq_wqe_counter;  /* reserved on Tavor */
 150         __be16 sq_wqe_counter;  /* reserved on Tavor */
 151         u32    reserved3[18];
 152 } __attribute__((packed));
 153
 154 struct mthca_qp_param {
 155         __be32 opt_param_mask;
 156         u32    reserved1;
 157         struct mthca_qp_context context;
 158         u32    reserved2[62];
 159 } __attribute__((packed));
 160
 161 enum {
 162         MTHCA_QP_OPTPAR_ALT_ADDR_PATH     = 1 << 0,
 163         MTHCA_QP_OPTPAR_RRE               = 1 << 1,
 164         MTHCA_QP_OPTPAR_RAE               = 1 << 2,
 165         MTHCA_QP_OPTPAR_RWE               = 1 << 3,
 166         MTHCA_QP_OPTPAR_PKEY_INDEX        = 1 << 4,
 167         MTHCA_QP_OPTPAR_Q_KEY             = 1 << 5,
 168         MTHCA_QP_OPTPAR_RNR_TIMEOUT       = 1 << 6,
 169         MTHCA_QP_OPTPAR_PRIMARY_ADDR_PATH = 1 << 7,
 170         MTHCA_QP_OPTPAR_SRA_MAX           = 1 << 8,
 171         MTHCA_QP_OPTPAR_RRA_MAX           = 1 << 9,
 172         MTHCA_QP_OPTPAR_PM_STATE          = 1 << 10,
 173         MTHCA_QP_OPTPAR_PORT_NUM          = 1 << 11,
 174         MTHCA_QP_OPTPAR_RETRY_COUNT       = 1 << 12,
 175         MTHCA_QP_OPTPAR_ALT_RNR_RETRY     = 1 << 13,
 176         MTHCA_QP_OPTPAR_ACK_TIMEOUT       = 1 << 14,
 177         MTHCA_QP_OPTPAR_RNR_RETRY         = 1 << 15,
 178         MTHCA_QP_OPTPAR_SCHED_QUEUE       = 1 << 16
 179 };
 180
 181 static const u8 mthca_opcode[] = {
 182         [IB_WR_SEND]                 = MTHCA_OPCODE_SEND,
 183         [IB_WR_SEND_WITH_IMM]        = MTHCA_OPCODE_SEND_IMM,
 184         [IB_WR_RDMA_WRITE]           = MTHCA_OPCODE_RDMA_WRITE,
 185         [IB_WR_RDMA_WRITE_WITH_IMM]  = MTHCA_OPCODE_RDMA_WRITE_IMM,
 186         [IB_WR_RDMA_READ]            = MTHCA_OPCODE_RDMA_READ,
 187         [IB_WR_ATOMIC_CMP_AND_SWP]   = MTHCA_OPCODE_ATOMIC_CS,
 188         [IB_WR_ATOMIC_FETCH_AND_ADD] = MTHCA_OPCODE_ATOMIC_FA,
 189 };
 190
 191 static int is_sqp(struct mthca_dev *dev, struct mthca_qp *qp)
 192 {
 193         return qp->qpn >= dev->qp_table.sqp_start &&
 194                 qp->qpn <= dev->qp_table.sqp_start + 3;
 195 }
 196
 197 static int is_qp0(struct mthca_dev *dev, struct mthca_qp *qp)
 198 {
 199         return qp->qpn >= dev->qp_table.sqp_start &&
 200                 qp->qpn <= dev->qp_table.sqp_start + 1;
 201 }
 202
 203 static void *get_recv_wqe(struct mthca_qp *qp, int n)
 204 {
 205         if (qp->is_direct)
 206                 return qp->queue.direct.buf + (n << qp->rq.wqe_shift);
 207         else
 208                 return qp->queue.page_list[(n << qp->rq.wqe_shift) >> PAGE_SHIFT].buf +
 209                         ((n << qp->rq.wqe_shift) & (PAGE_SIZE - 1));
 210 }
 211
 212 static void *get_send_wqe(struct mthca_qp *qp, int n)
 213 {
 214         if (qp->is_direct)
 215                 return qp->queue.direct.buf + qp->send_wqe_offset +
 216                         (n << qp->sq.wqe_shift);
 217         else
 218                 return qp->queue.page_list[(qp->send_wqe_offset +
 219                                             (n << qp->sq.wqe_shift)) >>
 220                                            PAGE_SHIFT].buf +
 221                         ((qp->send_wqe_offset + (n << qp->sq.wqe_shift)) &
 222                          (PAGE_SIZE - 1));
 223 }
 224
 225 static void mthca_wq_init(struct mthca_wq *wq)
 226 {
 227         spin_lock_init(&wq->lock);
 228         wq->next_ind  = 0;
 229         wq->last_comp = wq->max - 1;
 230         wq->head      = 0;
 231         wq->tail      = 0;
 232 }
 233
 234 void mthca_qp_event(struct mthca_dev *dev, u32 qpn,
 235                     enum ib_event_type event_type)
 236 {
 237         struct mthca_qp *qp;
 238         struct ib_event event;
 239
 240         spin_lock(&dev->qp_table.lock);
 241         qp = mthca_array_get(&dev->qp_table.qp, qpn & (dev->limits.num_qps - 1));
 242         if (qp)
 243                 atomic_inc(&qp->refcount);
 244         spin_unlock(&dev->qp_table.lock);
 245
 246         if (!qp) {
 247                 mthca_warn(dev, "Async event for bogus QP %08x\n", qpn);
 248                 return;
 249         }
 250
 251         event.device      = &dev->ib_dev;
 252         event.event       = event_type;
 253         event.element.qp  = &qp->ibqp;
 254         if (qp->ibqp.event_handler)
 255                 qp->ibqp.event_handler(&event, qp->ibqp.qp_context);
 256
 257         if (atomic_dec_and_test(&qp->refcount))
 258                 wake_up(&qp->wait);
 259 }
 260
 261 static int to_mthca_state(enum ib_qp_state ib_state)
 262 {
 263         switch (ib_state) {
 264         case IB_QPS_RESET: return MTHCA_QP_STATE_RST;
 265         case IB_QPS_INIT:  return MTHCA_QP_STATE_INIT;
 266         case IB_QPS_RTR:   return MTHCA_QP_STATE_RTR;
 267         case IB_QPS_RTS:   return MTHCA_QP_STATE_RTS;
 268         case IB_QPS_SQD:   return MTHCA_QP_STATE_SQD;
 269         case IB_QPS_SQE:   return MTHCA_QP_STATE_SQE;
 270         case IB_QPS_ERR:   return MTHCA_QP_STATE_ERR;
 271         default:                return -1;
 272         }
 273 }
 274
 275 enum { RC, UC, UD, RD, RDEE, MLX, NUM_TRANS };
 276
 277 static int to_mthca_st(int transport)
 278 {
 279         switch (transport) {
 280         case RC:  return MTHCA_QP_ST_RC;
 281         case UC:  return MTHCA_QP_ST_UC;
 282         case UD:  return MTHCA_QP_ST_UD;
 283         case RD:  return MTHCA_QP_ST_RD;
 284         case MLX: return MTHCA_QP_ST_MLX;
 285         default:  return -1;
 286         }
 287 }
 288
 289 static void store_attrs(struct mthca_sqp *sqp, struct ib_qp_attr *attr,
 290                         int attr_mask)
 291 {
 292         if (attr_mask & IB_QP_PKEY_INDEX)
 293                 sqp->pkey_index = attr->pkey_index;
 294         if (attr_mask & IB_QP_QKEY)
 295                 sqp->qkey = attr->qkey;
 296         if (attr_mask & IB_QP_SQ_PSN)
 297                 sqp->send_psn = attr->sq_psn;
 298 }
 299
 300 static void init_port(struct mthca_dev *dev, int port)
 301 {
 302         int err;
 303         u8 status;
 304         struct mthca_init_ib_param param;
 305
 306         memset(&param, 0, sizeof param);
 307
 308         param.port_width = dev->limits.port_width_cap;
 309         param.vl_cap     = dev->limits.vl_cap;
 310         param.mtu_cap    = dev->limits.mtu_cap;
 311         param.gid_cap    = dev->limits.gid_table_len;
 312         param.pkey_cap   = dev->limits.pkey_table_len;
 313
 314         err = mthca_INIT_IB(dev, &param, port, &status);
 315         if (err)
 316                 mthca_warn(dev, "INIT_IB failed, return code %d.\n", err);
 317         if (status)
 318                 mthca_warn(dev, "INIT_IB returned status %02x.\n", status);
 319 }
 320
 321 static __be32 get_hw_access_flags(struct mthca_qp *qp, struct ib_qp_attr *attr,
 322                                   int attr_mask)
 323 {
 324         u8 dest_rd_atomic;
 325         u32 access_flags;
 326         u32 hw_access_flags = 0;
 327
 328         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 329                 dest_rd_atomic = attr->max_dest_rd_atomic;
 330         else
 331                 dest_rd_atomic = qp->resp_depth;
 332
 333         if (attr_mask & IB_QP_ACCESS_FLAGS)
 334                 access_flags = attr->qp_access_flags;
 335         else
 336                 access_flags = qp->atomic_rd_en;
 337
 338         if (!dest_rd_atomic)
 339                 access_flags &= IB_ACCESS_REMOTE_WRITE;
 340
 341         if (access_flags & IB_ACCESS_REMOTE_READ)
 342                 hw_access_flags |= MTHCA_QP_BIT_RRE;
 343         if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
 344                 hw_access_flags |= MTHCA_QP_BIT_RAE;
 345         if (access_flags & IB_ACCESS_REMOTE_WRITE)
 346                 hw_access_flags |= MTHCA_QP_BIT_RWE;
 347
 348         return cpu_to_be32(hw_access_flags);
 349 }
 350
 351 static inline enum ib_qp_state to_ib_qp_state(int mthca_state)
 352 {
 353         switch (mthca_state) {
 354         case MTHCA_QP_STATE_RST:      return IB_QPS_RESET;
 355         case MTHCA_QP_STATE_INIT:     return IB_QPS_INIT;
 356         case MTHCA_QP_STATE_RTR:      return IB_QPS_RTR;
 357         case MTHCA_QP_STATE_RTS:      return IB_QPS_RTS;
 358         case MTHCA_QP_STATE_DRAINING:
 359         case MTHCA_QP_STATE_SQD:      return IB_QPS_SQD;
 360         case MTHCA_QP_STATE_SQE:      return IB_QPS_SQE;
 361         case MTHCA_QP_STATE_ERR:      return IB_QPS_ERR;
 362         default:                      return -1;
 363         }
 364 }
 365
 366 static inline enum ib_mig_state to_ib_mig_state(int mthca_mig_state)
 367 {
 368         switch (mthca_mig_state) {
 369         case 0:  return IB_MIG_ARMED;
 370         case 1:  return IB_MIG_REARM;
 371         case 3:  return IB_MIG_MIGRATED;
 372         default: return -1;
 373         }
 374 }
 375
 376 static int to_ib_qp_access_flags(int mthca_flags)
 377 {
 378         int ib_flags = 0;
 379
 380         if (mthca_flags & MTHCA_QP_BIT_RRE)
 381                 ib_flags |= IB_ACCESS_REMOTE_READ;
 382         if (mthca_flags & MTHCA_QP_BIT_RWE)
 383                 ib_flags |= IB_ACCESS_REMOTE_WRITE;
 384         if (mthca_flags & MTHCA_QP_BIT_RAE)
 385                 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
 386
 387         return ib_flags;
 388 }
 389
 390 static void to_ib_ah_attr(struct mthca_dev *dev, struct ib_ah_attr *ib_ah_attr,
 391                                 struct mthca_qp_path *path)
 392 {
 393         memset(ib_ah_attr, 0, sizeof *path);
 394         ib_ah_attr->port_num      = (be32_to_cpu(path->port_pkey) >> 24) & 0x3;
 395         ib_ah_attr->dlid          = be16_to_cpu(path->rlid);
 396         ib_ah_attr->sl            = be32_to_cpu(path->sl_tclass_flowlabel) >> 28;
 397         ib_ah_attr->src_path_bits = path->g_mylmc & 0x7f;
 398         ib_ah_attr->static_rate   = path->static_rate & 0x7;
 399         ib_ah_attr->ah_flags      = (path->g_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
 400         if (ib_ah_attr->ah_flags) {
 401                 ib_ah_attr->grh.sgid_index = path->mgid_index & (dev->limits.gid_table_len - 1);
 402                 ib_ah_attr->grh.hop_limit  = path->hop_limit;
 403                 ib_ah_attr->grh.traffic_class =
 404                         (be32_to_cpu(path->sl_tclass_flowlabel) >> 20) & 0xff;
 405                 ib_ah_attr->grh.flow_label =
 406                         be32_to_cpu(path->sl_tclass_flowlabel) & 0xfffff;
 407                 memcpy(ib_ah_attr->grh.dgid.raw,
 408                         path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
 409         }
 410 }
 411
 412 int mthca_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
 413                    struct ib_qp_init_attr *qp_init_attr)
 414 {
 415         struct mthca_dev *dev = to_mdev(ibqp->device);
 416         struct mthca_qp *qp = to_mqp(ibqp);
 417         int err;
 418         struct mthca_mailbox *mailbox;
 419         struct mthca_qp_param *qp_param;
 420         struct mthca_qp_context *context;
 421         int mthca_state;
 422         u8 status;
 423
 424         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 425         if (IS_ERR(mailbox))
 426                 return PTR_ERR(mailbox);
 427
 428         err = mthca_QUERY_QP(dev, qp->qpn, 0, mailbox, &status);
 429         if (err)
 430                 goto out;
 431         if (status) {
 432                 mthca_warn(dev, "QUERY_QP returned status %02x\n", status);
 433                 err = -EINVAL;
 434                 goto out;
 435         }
 436
 437         qp_param    = mailbox->buf;
 438         context     = &qp_param->context;
 439         mthca_state = be32_to_cpu(context->flags) >> 28;
 440
 441         qp_attr->qp_state            = to_ib_qp_state(mthca_state);
 442         qp_attr->cur_qp_state        = qp_attr->qp_state;
 443         qp_attr->path_mtu            = context->mtu_msgmax >> 5;
 444         qp_attr->path_mig_state      =
 445                 to_ib_mig_state((be32_to_cpu(context->flags) >> 11) & 0x3);
 446         qp_attr->qkey                = be32_to_cpu(context->qkey);
 447         qp_attr->rq_psn              = be32_to_cpu(context->rnr_nextrecvpsn) & 0xffffff;
 448         qp_attr->sq_psn              = be32_to_cpu(context->next_send_psn) & 0xffffff;
 449         qp_attr->dest_qp_num         = be32_to_cpu(context->remote_qpn) & 0xffffff;
 450         qp_attr->qp_access_flags     =
 451                 to_ib_qp_access_flags(be32_to_cpu(context->params2));
 452         qp_attr->cap.max_send_wr     = qp->sq.max;
 453         qp_attr->cap.max_recv_wr     = qp->rq.max;
 454         qp_attr->cap.max_send_sge    = qp->sq.max_gs;
 455         qp_attr->cap.max_recv_sge    = qp->rq.max_gs;
 456         qp_attr->cap.max_inline_data = qp->max_inline_data;
 457
 458         to_ib_ah_attr(dev, &qp_attr->ah_attr, &context->pri_path);
 459         to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context->alt_path);
 460
 461         qp_attr->pkey_index     = be32_to_cpu(context->pri_path.port_pkey) & 0x7f;
 462         qp_attr->alt_pkey_index = be32_to_cpu(context->alt_path.port_pkey) & 0x7f;
 463
 464         /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
 465         qp_attr->sq_draining = mthca_state == MTHCA_QP_STATE_DRAINING;
 466
 467         qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context->params1) >> 21) & 0x7);
 468
 469         qp_attr->max_dest_rd_atomic =
 470                 1 << ((be32_to_cpu(context->params2) >> 21) & 0x7);
 471         qp_attr->min_rnr_timer      =
 472                 (be32_to_cpu(context->rnr_nextrecvpsn) >> 24) & 0x1f;
 473         qp_attr->port_num           = qp_attr->ah_attr.port_num;
 474         qp_attr->timeout            = context->pri_path.ackto >> 3;
 475         qp_attr->retry_cnt          = (be32_to_cpu(context->params1) >> 16) & 0x7;
 476         qp_attr->rnr_retry          = context->pri_path.rnr_retry >> 5;
 477         qp_attr->alt_port_num       = qp_attr->alt_ah_attr.port_num;
 478         qp_attr->alt_timeout        = context->alt_path.ackto >> 3;
 479         qp_init_attr->cap           = qp_attr->cap;
 480
 481 out:
 482         mthca_free_mailbox(dev, mailbox);
 483         return err;
 484 }
 485
 486 static void mthca_path_set(struct ib_ah_attr *ah, struct mthca_qp_path *path)
 487 {
 488         path->g_mylmc     = ah->src_path_bits & 0x7f;
 489         path->rlid        = cpu_to_be16(ah->dlid);
 490         path->static_rate = !!ah->static_rate;
 491
 492         if (ah->ah_flags & IB_AH_GRH) {
 493                 path->g_mylmc   |= 1 << 7;
 494                 path->mgid_index = ah->grh.sgid_index;
 495                 path->hop_limit  = ah->grh.hop_limit;
 496                 path->sl_tclass_flowlabel =
 497                         cpu_to_be32((ah->sl << 28)                |
 498                                     (ah->grh.traffic_class << 20) |
 499                                     (ah->grh.flow_label));
 500                 memcpy(path->rgid, ah->grh.dgid.raw, 16);
 501         } else
 502                 path->sl_tclass_flowlabel = cpu_to_be32(ah->sl << 28);
 503 }
 504
 505 int mthca_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask)
 506 {
 507         struct mthca_dev *dev = to_mdev(ibqp->device);
 508         struct mthca_qp *qp = to_mqp(ibqp);
 509         enum ib_qp_state cur_state, new_state;
 510         struct mthca_mailbox *mailbox;
 511         struct mthca_qp_param *qp_param;
 512         struct mthca_qp_context *qp_context;
 513         u32 sqd_event = 0;
 514         u8 status;
 515         int err;
 516
 517         if (attr_mask & IB_QP_CUR_STATE) {
 518                 cur_state = attr->cur_qp_state;
 519         } else {
 520                 spin_lock_irq(&qp->sq.lock);
 521                 spin_lock(&qp->rq.lock);
 522                 cur_state = qp->state;
 523                 spin_unlock(&qp->rq.lock);
 524                 spin_unlock_irq(&qp->sq.lock);
 525         }
 526
 527         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
 528
 529         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) {
 530                 mthca_dbg(dev, "Bad QP transition (transport %d) "
 531                           "%d->%d with attr 0x%08x\n",
 532                           qp->transport, cur_state, new_state,
 533                           attr_mask);
 534                 return -EINVAL;
 535         }
 536
 537         if ((attr_mask & IB_QP_PKEY_INDEX) &&
 538              attr->pkey_index >= dev->limits.pkey_table_len) {
 539                 mthca_dbg(dev, "P_Key index (%u) too large. max is %d\n",
 540                           attr->pkey_index, dev->limits.pkey_table_len-1);
 541                 return -EINVAL;
 542         }
 543
 544         if ((attr_mask & IB_QP_PORT) &&
 545             (attr->port_num == 0 || attr->port_num > dev->limits.num_ports)) {
 546                 mthca_dbg(dev, "Port number (%u) is invalid\n", attr->port_num);
 547                 return -EINVAL;
 548         }
 549
 550         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
 551             attr->max_rd_atomic > dev->limits.max_qp_init_rdma) {
 552                 mthca_dbg(dev, "Max rdma_atomic as initiator %u too large (max is %d)\n",
 553                           attr->max_rd_atomic, dev->limits.max_qp_init_rdma);
 554                 return -EINVAL;
 555         }
 556
 557         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
 558             attr->max_dest_rd_atomic > 1 << dev->qp_table.rdb_shift) {
 559                 mthca_dbg(dev, "Max rdma_atomic as responder %u too large (max %d)\n",
 560                           attr->max_dest_rd_atomic, 1 << dev->qp_table.rdb_shift);
 561                 return -EINVAL;
 562         }
 563
 564         mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
 565         if (IS_ERR(mailbox))
 566                 return PTR_ERR(mailbox);
 567         qp_param = mailbox->buf;
 568         qp_context = &qp_param->context;
 569         memset(qp_param, 0, sizeof *qp_param);
 570
 571         qp_context->flags      = cpu_to_be32((to_mthca_state(new_state) << 28) |
 572                                              (to_mthca_st(qp->transport) << 16));
 573         qp_context->flags     |= cpu_to_be32(MTHCA_QP_BIT_DE);
 574         if (!(attr_mask & IB_QP_PATH_MIG_STATE))
 575                 qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_MIGRATED << 11);
 576         else {
 577                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PM_STATE);
 578                 switch (attr->path_mig_state) {
 579                 case IB_MIG_MIGRATED:
 580                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_MIGRATED << 11);
 581                         break;
 582                 case IB_MIG_REARM:
 583                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_REARM << 11);
 584                         break;
 585                 case IB_MIG_ARMED:
 586                         qp_context->flags |= cpu_to_be32(MTHCA_QP_PM_ARMED << 11);
 587                         break;
 588                 }
 589         }
 590
 591         /* leave tavor_sched_queue as 0 */
 592
 593         if (qp->transport == MLX || qp->transport == UD)
 594                 qp_context->mtu_msgmax = (IB_MTU_2048 << 5) | 11;
 595         else if (attr_mask & IB_QP_PATH_MTU)
 596                 qp_context->mtu_msgmax = (attr->path_mtu << 5) | 31;
 597
 598         if (mthca_is_memfree(dev)) {
 599                 if (qp->rq.max)
 600                         qp_context->rq_size_stride = long_log2(qp->rq.max) << 3;
 601                 qp_context->rq_size_stride |= qp->rq.wqe_shift - 4;
 602
 603                 if (qp->sq.max)
 604                         qp_context->sq_size_stride = long_log2(qp->sq.max) << 3;
 605                 qp_context->sq_size_stride |= qp->sq.wqe_shift - 4;
 606         }
 607
 608         /* leave arbel_sched_queue as 0 */
 609
 610         if (qp->ibqp.uobject)
 611                 qp_context->usr_page =
 612                         cpu_to_be32(to_mucontext(qp->ibqp.uobject->context)->uar.index);
 613         else
 614                 qp_context->usr_page = cpu_to_be32(dev->driver_uar.index);
 615         qp_context->local_qpn  = cpu_to_be32(qp->qpn);
 616         if (attr_mask & IB_QP_DEST_QPN) {
 617                 qp_context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
 618         }
 619
 620         if (qp->transport == MLX)
 621                 qp_context->pri_path.port_pkey |=
 622                         cpu_to_be32(to_msqp(qp)->port << 24);
 623         else {
 624                 if (attr_mask & IB_QP_PORT) {
 625                         qp_context->pri_path.port_pkey |=
 626                                 cpu_to_be32(attr->port_num << 24);
 627                         qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PORT_NUM);
 628                 }
 629         }
 630
 631         if (attr_mask & IB_QP_PKEY_INDEX) {
 632                 qp_context->pri_path.port_pkey |=
 633                         cpu_to_be32(attr->pkey_index);
 634                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PKEY_INDEX);
 635         }
 636
 637         if (attr_mask & IB_QP_RNR_RETRY) {
 638                 qp_context->alt_path.rnr_retry = qp_context->pri_path.rnr_retry =
 639                         attr->rnr_retry << 5;
 640                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RNR_RETRY |
 641                                                         MTHCA_QP_OPTPAR_ALT_RNR_RETRY);
 642         }
 643
 644         if (attr_mask & IB_QP_AV) {
 645                 mthca_path_set(&attr->ah_attr, &qp_context->pri_path);
 646                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_PRIMARY_ADDR_PATH);
 647         }
 648
 649         if (attr_mask & IB_QP_TIMEOUT) {
 650                 qp_context->pri_path.ackto = attr->timeout << 3;
 651                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_ACK_TIMEOUT);
 652         }
 653
 654         if (attr_mask & IB_QP_ALT_PATH) {
 655                 if (attr->alt_pkey_index >= dev->limits.pkey_table_len) {
 656                         mthca_dbg(dev, "Alternate P_Key index (%u) too large. max is %d\n",
 657                                   attr->alt_pkey_index, dev->limits.pkey_table_len-1);
 658                         return -EINVAL;
 659                 }
 660
 661                 if (attr->alt_port_num == 0 || attr->alt_port_num > dev->limits.num_ports) {
 662                         mthca_dbg(dev, "Alternate port number (%u) is invalid\n",
 663                                 attr->alt_port_num);
 664                         return -EINVAL;
 665                 }
 666
 667                 mthca_path_set(&attr->alt_ah_attr, &qp_context->alt_path);
 668                 qp_context->alt_path.port_pkey |= cpu_to_be32(attr->alt_pkey_index |
 669                                                               attr->alt_port_num << 24);
 670                 qp_context->alt_path.ackto = attr->alt_timeout << 3;
 671                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_ALT_ADDR_PATH);
 672         }
 673
 674         /* leave rdd as 0 */
 675         qp_context->pd         = cpu_to_be32(to_mpd(ibqp->pd)->pd_num);
 676         /* leave wqe_base as 0 (we always create an MR based at 0 for WQs) */
 677         qp_context->wqe_lkey   = cpu_to_be32(qp->mr.ibmr.lkey);
 678         qp_context->params1    = cpu_to_be32((MTHCA_ACK_REQ_FREQ << 28) |
 679                                              (MTHCA_FLIGHT_LIMIT << 24) |
 680                                              MTHCA_QP_BIT_SWE);
 681         if (qp->sq_policy == IB_SIGNAL_ALL_WR)
 682                 qp_context->params1 |= cpu_to_be32(MTHCA_QP_BIT_SSC);
 683         if (attr_mask & IB_QP_RETRY_CNT) {
 684                 qp_context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
 685                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RETRY_COUNT);
 686         }
 687
 688         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
 689                 if (attr->max_rd_atomic) {
 690                         qp_context->params1 |=
 691                                 cpu_to_be32(MTHCA_QP_BIT_SRE |
 692                                             MTHCA_QP_BIT_SAE);
 693                         qp_context->params1 |=
 694                                 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
 695                 }
 696                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_SRA_MAX);
 697         }
 698
 699         if (attr_mask & IB_QP_SQ_PSN)
 700                 qp_context->next_send_psn = cpu_to_be32(attr->sq_psn);
 701         qp_context->cqn_snd = cpu_to_be32(to_mcq(ibqp->send_cq)->cqn);
 702
 703         if (mthca_is_memfree(dev)) {
 704                 qp_context->snd_wqe_base_l = cpu_to_be32(qp->send_wqe_offset);
 705                 qp_context->snd_db_index   = cpu_to_be32(qp->sq.db_index);
 706         }
 707
 708         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
 709                 if (attr->max_dest_rd_atomic)
 710                         qp_context->params2 |=
 711                                 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
 712
 713                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RRA_MAX);
 714         }
 715
 716         if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
 717                 qp_context->params2      |= get_hw_access_flags(qp, attr, attr_mask);
 718                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RWE |
 719                                                         MTHCA_QP_OPTPAR_RRE |
 720                                                         MTHCA_QP_OPTPAR_RAE);
 721         }
 722
 723         qp_context->params2 |= cpu_to_be32(MTHCA_QP_BIT_RSC);
 724
 725         if (ibqp->srq)
 726                 qp_context->params2 |= cpu_to_be32(MTHCA_QP_BIT_RIC);
 727
 728         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 729                 qp_context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
 730                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_RNR_TIMEOUT);
 731         }
 732         if (attr_mask & IB_QP_RQ_PSN)
 733                 qp_context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
 734
 735         qp_context->ra_buff_indx =
 736                 cpu_to_be32(dev->qp_table.rdb_base +
 737                             ((qp->qpn & (dev->limits.num_qps - 1)) * MTHCA_RDB_ENTRY_SIZE <<
 738                              dev->qp_table.rdb_shift));
 739
 740         qp_context->cqn_rcv = cpu_to_be32(to_mcq(ibqp->recv_cq)->cqn);
 741
 742         if (mthca_is_memfree(dev))
 743                 qp_context->rcv_db_index   = cpu_to_be32(qp->rq.db_index);
 744
 745         if (attr_mask & IB_QP_QKEY) {
 746                 qp_context->qkey = cpu_to_be32(attr->qkey);
 747                 qp_param->opt_param_mask |= cpu_to_be32(MTHCA_QP_OPTPAR_Q_KEY);
 748         }
 749
 750         if (ibqp->srq)
 751                 qp_context->srqn = cpu_to_be32(1 << 24 |
 752                                                to_msrq(ibqp->srq)->srqn);
 753
 754         if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD  &&
 755             attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY               &&
 756             attr->en_sqd_async_notify)
 757                 sqd_event = 1 << 31;
 758
 759         err = mthca_MODIFY_QP(dev, cur_state, new_state, qp->qpn, 0,
 760                               mailbox, sqd_event, &status);
 761         if (status) {
 762                 mthca_warn(dev, "modify QP %d->%d returned status %02x.\n",
 763                            cur_state, new_state, status);
 764                 err = -EINVAL;
 765         }
 766
 767         if (!err) {
 768                 qp->state = new_state;
 769                 if (attr_mask & IB_QP_ACCESS_FLAGS)
 770                         qp->atomic_rd_en = attr->qp_access_flags;
 771                 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 772                         qp->resp_depth = attr->max_dest_rd_atomic;
 773         }
 774
 775         mthca_free_mailbox(dev, mailbox);
 776
 777         if (is_sqp(dev, qp))
 778                 store_attrs(to_msqp(qp), attr, attr_mask);
 779
 780         /*
 781          * If we moved QP0 to RTR, bring the IB link up; if we moved
 782          * QP0 to RESET or ERROR, bring the link back down.
 783          */
 784         if (is_qp0(dev, qp)) {
 785                 if (cur_state != IB_QPS_RTR &&
 786                     new_state == IB_QPS_RTR)
 787                         init_port(dev, to_msqp(qp)->port);
 788
 789                 if (cur_state != IB_QPS_RESET &&
 790                     cur_state != IB_QPS_ERR &&
 791                     (new_state == IB_QPS_RESET ||
 792                      new_state == IB_QPS_ERR))
 793                         mthca_CLOSE_IB(dev, to_msqp(qp)->port, &status);
 794         }
 795
 796         /*
 797          * If we moved a kernel QP to RESET, clean up all old CQ
 798          * entries and reinitialize the QP.
 799          */
 800         if (!err && new_state == IB_QPS_RESET && !qp->ibqp.uobject) {
 801                 mthca_cq_clean(dev, to_mcq(qp->ibqp.send_cq)->cqn, qp->qpn,
 802                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
 803                 if (qp->ibqp.send_cq != qp->ibqp.recv_cq)
 804                         mthca_cq_clean(dev, to_mcq(qp->ibqp.recv_cq)->cqn, qp->qpn,
 805                                        qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
 806
 807                 mthca_wq_init(&qp->sq);
 808                 qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
 809
 810                 mthca_wq_init(&qp->rq);
 811                 qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
 812
 813                 if (mthca_is_memfree(dev)) {
 814                         *qp->sq.db = 0;
 815                         *qp->rq.db = 0;
 816                 }
 817         }
 818
 819         return err;
 820 }
 821
 822 static int mthca_max_data_size(struct mthca_dev *dev, struct mthca_qp *qp, int desc_sz)
 823 {
 824         /*
 825          * Calculate the maximum size of WQE s/g segments, excluding
 826          * the next segment and other non-data segments.
 827          */
 828         int max_data_size = desc_sz - sizeof (struct mthca_next_seg);
 829
 830         switch (qp->transport) {
 831         case MLX:
 832                 max_data_size -= 2 * sizeof (struct mthca_data_seg);
 833                 break;
 834
 835         case UD:
 836                 if (mthca_is_memfree(dev))
 837                         max_data_size -= sizeof (struct mthca_arbel_ud_seg);
 838                 else
 839                         max_data_size -= sizeof (struct mthca_tavor_ud_seg);
 840                 break;
 841
 842         default:
 843                 max_data_size -= sizeof (struct mthca_raddr_seg);
 844                 break;
 845         }
 846
 847         return max_data_size;
 848 }
 849
 850 static inline int mthca_max_inline_data(struct mthca_pd *pd, int max_data_size)
 851 {
 852         /* We don't support inline data for kernel QPs (yet). */
 853         return pd->ibpd.uobject ? max_data_size - MTHCA_INLINE_HEADER_SIZE : 0;
 854 }
 855
 856 static void mthca_adjust_qp_caps(struct mthca_dev *dev,
 857                                  struct mthca_pd *pd,
 858                                  struct mthca_qp *qp)
 859 {
 860         int max_data_size = mthca_max_data_size(dev, qp,
 861                                                 min(dev->limits.max_desc_sz,
 862                                                     1 << qp->sq.wqe_shift));
 863
 864         qp->max_inline_data = mthca_max_inline_data(pd, max_data_size);
 865
 866         qp->sq.max_gs = min_t(int, dev->limits.max_sg,
 867                               max_data_size / sizeof (struct mthca_data_seg));
 868         qp->rq.max_gs = min_t(int, dev->limits.max_sg,
 869                                (min(dev->limits.max_desc_sz, 1 << qp->rq.wqe_shift) -
 870                                 sizeof (struct mthca_next_seg)) /
 871                                sizeof (struct mthca_data_seg));
 872 }
 873
 874 /*
 875  * Allocate and register buffer for WQEs.  qp->rq.max, sq.max,
 876  * rq.max_gs and sq.max_gs must all be assigned.
 877  * mthca_alloc_wqe_buf will calculate rq.wqe_shift and
 878  * sq.wqe_shift (as well as send_wqe_offset, is_direct, and
 879  * queue)
 880  */
 881 static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 882                                struct mthca_pd *pd,
 883                                struct mthca_qp *qp)
 884 {
 885         int size;
 886         int err = -ENOMEM;
 887
 888         size = sizeof (struct mthca_next_seg) +
 889                 qp->rq.max_gs * sizeof (struct mthca_data_seg);
 890
 891         if (size > dev->limits.max_desc_sz)
 892                 return -EINVAL;
 893
 894         for (qp->rq.wqe_shift = 6; 1 << qp->rq.wqe_shift < size;
 895              qp->rq.wqe_shift++)
 896                 ; /* nothing */
 897
 898         size = qp->sq.max_gs * sizeof (struct mthca_data_seg);
 899         switch (qp->transport) {
 900         case MLX:
 901                 size += 2 * sizeof (struct mthca_data_seg);
 902                 break;
 903
 904         case UD:
 905                 size += mthca_is_memfree(dev) ?
 906                         sizeof (struct mthca_arbel_ud_seg) :
 907                         sizeof (struct mthca_tavor_ud_seg);
 908                 break;
 909
 910         case UC:
 911                 size += sizeof (struct mthca_raddr_seg);
 912                 break;
 913
 914         case RC:
 915                 size += sizeof (struct mthca_raddr_seg);
 916                 /*
 917                  * An atomic op will require an atomic segment, a
 918                  * remote address segment and one scatter entry.
 919                  */
 920                 size = max_t(int, size,
 921                              sizeof (struct mthca_atomic_seg) +
 922                              sizeof (struct mthca_raddr_seg) +
 923                              sizeof (struct mthca_data_seg));
 924                 break;
 925
 926         default:
 927                 break;
 928         }
 929
 930         /* Make sure that we have enough space for a bind request */
 931         size = max_t(int, size, sizeof (struct mthca_bind_seg));
 932
 933         size += sizeof (struct mthca_next_seg);
 934
 935         if (size > dev->limits.max_desc_sz)
 936                 return -EINVAL;
 937
 938         for (qp->sq.wqe_shift = 6; 1 << qp->sq.wqe_shift < size;
 939              qp->sq.wqe_shift++)
 940                 ; /* nothing */
 941
 942         qp->send_wqe_offset = ALIGN(qp->rq.max << qp->rq.wqe_shift,
 943                                     1 << qp->sq.wqe_shift);
 944
 945         /*
 946          * If this is a userspace QP, we don't actually have to
 947          * allocate anything.  All we need is to calculate the WQE
 948          * sizes and the send_wqe_offset, so we're done now.
 949          */
 950         if (pd->ibpd.uobject)
 951                 return 0;
 952
 953         size = PAGE_ALIGN(qp->send_wqe_offset +
 954                           (qp->sq.max << qp->sq.wqe_shift));
 955
 956         qp->wrid = kmalloc((qp->rq.max + qp->sq.max) * sizeof (u64),
 957                            GFP_KERNEL);
 958         if (!qp->wrid)
 959                 goto err_out;
 960
 961         err = mthca_buf_alloc(dev, size, MTHCA_MAX_DIRECT_QP_SIZE,
 962                               &qp->queue, &qp->is_direct, pd, 0, &qp->mr);
 963         if (err)
 964                 goto err_out;
 965
 966         return 0;
 967
 968 err_out:
 969         kfree(qp->wrid);
 970         return err;
 971 }
 972
 973 static void mthca_free_wqe_buf(struct mthca_dev *dev,
 974                                struct mthca_qp *qp)
 975 {
 976         mthca_buf_free(dev, PAGE_ALIGN(qp->send_wqe_offset +
 977                                        (qp->sq.max << qp->sq.wqe_shift)),
 978                        &qp->queue, qp->is_direct, &qp->mr);
 979         kfree(qp->wrid);
 980 }
 981
 982 static int mthca_map_memfree(struct mthca_dev *dev,
 983                              struct mthca_qp *qp)
 984 {
 985         int ret;
 986
 987         if (mthca_is_memfree(dev)) {
 988                 ret = mthca_table_get(dev, dev->qp_table.qp_table, qp->qpn);
 989                 if (ret)
 990                         return ret;
 991
 992                 ret = mthca_table_get(dev, dev->qp_table.eqp_table, qp->qpn);
 993                 if (ret)
 994                         goto err_qpc;
 995
 996                 ret = mthca_table_get(dev, dev->qp_table.rdb_table,
 997                                       qp->qpn << dev->qp_table.rdb_shift);
 998                 if (ret)
 999                         goto err_eqpc;
1000
1001         }
1002
1003         return 0;
1004
1005 err_eqpc:
1006         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1007
1008 err_qpc:
1009         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1010
1011         return ret;
1012 }
1013
1014 static void mthca_unmap_memfree(struct mthca_dev *dev,
1015                                 struct mthca_qp *qp)
1016 {
1017         mthca_table_put(dev, dev->qp_table.rdb_table,
1018                         qp->qpn << dev->qp_table.rdb_shift);
1019         mthca_table_put(dev, dev->qp_table.eqp_table, qp->qpn);
1020         mthca_table_put(dev, dev->qp_table.qp_table, qp->qpn);
1021 }
1022
1023 static int mthca_alloc_memfree(struct mthca_dev *dev,
1024                                struct mthca_qp *qp)
1025 {
1026         int ret = 0;
1027
1028         if (mthca_is_memfree(dev)) {
1029                 qp->rq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_RQ,
1030                                                  qp->qpn, &qp->rq.db);
1031                 if (qp->rq.db_index < 0)
1032                         return ret;
1033
1034                 qp->sq.db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SQ,
1035                                                  qp->qpn, &qp->sq.db);
1036                 if (qp->sq.db_index < 0)
1037                         mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1038         }
1039
1040         return ret;
1041 }
1042
1043 static void mthca_free_memfree(struct mthca_dev *dev,
1044                                struct mthca_qp *qp)
1045 {
1046         if (mthca_is_memfree(dev)) {
1047                 mthca_free_db(dev, MTHCA_DB_TYPE_SQ, qp->sq.db_index);
1048                 mthca_free_db(dev, MTHCA_DB_TYPE_RQ, qp->rq.db_index);
1049         }
1050 }
1051
1052 static int mthca_alloc_qp_common(struct mthca_dev *dev,
1053                                  struct mthca_pd *pd,
1054                                  struct mthca_cq *send_cq,
1055                                  struct mthca_cq *recv_cq,
1056                                  enum ib_sig_type send_policy,
1057                                  struct mthca_qp *qp)
1058 {
1059         int ret;
1060         int i;
1061
1062         atomic_set(&qp->refcount, 1);
1063         init_waitqueue_head(&qp->wait);
1064         qp->state        = IB_QPS_RESET;
1065         qp->atomic_rd_en = 0;
1066         qp->resp_depth   = 0;
1067         qp->sq_policy    = send_policy;
1068         mthca_wq_init(&qp->sq);
1069         mthca_wq_init(&qp->rq);
1070
1071         ret = mthca_map_memfree(dev, qp);
1072         if (ret)
1073                 return ret;
1074
1075         ret = mthca_alloc_wqe_buf(dev, pd, qp);
1076         if (ret) {
1077                 mthca_unmap_memfree(dev, qp);
1078                 return ret;
1079         }
1080
1081         mthca_adjust_qp_caps(dev, pd, qp);
1082
1083         /*
1084          * If this is a userspace QP, we're done now.  The doorbells
1085          * will be allocated and buffers will be initialized in
1086          * userspace.
1087          */
1088         if (pd->ibpd.uobject)
1089                 return 0;
1090
1091         ret = mthca_alloc_memfree(dev, qp);
1092         if (ret) {
1093                 mthca_free_wqe_buf(dev, qp);
1094                 mthca_unmap_memfree(dev, qp);
1095                 return ret;
1096         }
1097
1098         if (mthca_is_memfree(dev)) {
1099                 struct mthca_next_seg *next;
1100                 struct mthca_data_seg *scatter;
1101                 int size = (sizeof (struct mthca_next_seg) +
1102                             qp->rq.max_gs * sizeof (struct mthca_data_seg)) / 16;
1103
1104                 for (i = 0; i < qp->rq.max; ++i) {
1105                         next = get_recv_wqe(qp, i);
1106                         next->nda_op = cpu_to_be32(((i + 1) & (qp->rq.max - 1)) <<
1107                                                    qp->rq.wqe_shift);
1108                         next->ee_nds = cpu_to_be32(size);
1109
1110                         for (scatter = (void *) (next + 1);
1111                              (void *) scatter < (void *) next + (1 << qp->rq.wqe_shift);
1112                              ++scatter)
1113                                 scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
1114                 }
1115
1116                 for (i = 0; i < qp->sq.max; ++i) {
1117                         next = get_send_wqe(qp, i);
1118                         next->nda_op = cpu_to_be32((((i + 1) & (qp->sq.max - 1)) <<
1119                                                     qp->sq.wqe_shift) +
1120                                                    qp->send_wqe_offset);
1121                 }
1122         }
1123
1124         qp->sq.last = get_send_wqe(qp, qp->sq.max - 1);
1125         qp->rq.last = get_recv_wqe(qp, qp->rq.max - 1);
1126
1127         return 0;
1128 }
1129
1130 static int mthca_set_qp_size(struct mthca_dev *dev, struct ib_qp_cap *cap,
1131                              struct mthca_pd *pd, struct mthca_qp *qp)
1132 {
1133         int max_data_size = mthca_max_data_size(dev, qp, dev->limits.max_desc_sz);
1134
1135         /* Sanity check QP size before proceeding */
1136         if (cap->max_send_wr     > dev->limits.max_wqes ||
1137             cap->max_recv_wr     > dev->limits.max_wqes ||
1138             cap->max_send_sge    > dev->limits.max_sg   ||
1139             cap->max_recv_sge    > dev->limits.max_sg   ||
1140             cap->max_inline_data > mthca_max_inline_data(pd, max_data_size))
1141                 return -EINVAL;
1142
1143         /*
1144          * For MLX transport we need 2 extra S/G entries:
1145          * one for the header and one for the checksum at the end
1146          */
1147         if (qp->transport == MLX && cap->max_recv_sge + 2 > dev->limits.max_sg)
1148                 return -EINVAL;
1149
1150         if (mthca_is_memfree(dev)) {
1151                 qp->rq.max = cap->max_recv_wr ?
1152                         roundup_pow_of_two(cap->max_recv_wr) : 0;
1153                 qp->sq.max = cap->max_send_wr ?
1154                         roundup_pow_of_two(cap->max_send_wr) : 0;
1155         } else {
1156                 qp->rq.max = cap->max_recv_wr;
1157                 qp->sq.max = cap->max_send_wr;
1158         }
1159
1160         qp->rq.max_gs = cap->max_recv_sge;
1161         qp->sq.max_gs = max_t(int, cap->max_send_sge,
1162                               ALIGN(cap->max_inline_data + MTHCA_INLINE_HEADER_SIZE,
1163                                     MTHCA_INLINE_CHUNK_SIZE) /
1164                               sizeof (struct mthca_data_seg));
1165
1166         return 0;
1167 }
1168
1169 int mthca_alloc_qp(struct mthca_dev *dev,
1170                    struct mthca_pd *pd,
1171                    struct mthca_cq *send_cq,
1172                    struct mthca_cq *recv_cq,
1173                    enum ib_qp_type type,
1174                    enum ib_sig_type send_policy,
1175                    struct ib_qp_cap *cap,
1176                    struct mthca_qp *qp)
1177 {
1178         int err;
1179
1180         err = mthca_set_qp_size(dev, cap, pd, qp);
1181         if (err)
1182                 return err;
1183
1184         switch (type) {
1185         case IB_QPT_RC: qp->transport = RC; break;
1186         case IB_QPT_UC: qp->transport = UC; break;
1187         case IB_QPT_UD: qp->transport = UD; break;
1188         default: return -EINVAL;
1189         }
1190
1191         qp->qpn = mthca_alloc(&dev->qp_table.alloc);
1192         if (qp->qpn == -1)
1193                 return -ENOMEM;
1194
1195         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1196                                     send_policy, qp);
1197         if (err) {
1198                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1199                 return err;
1200         }
1201
1202         spin_lock_irq(&dev->qp_table.lock);
1203         mthca_array_set(&dev->qp_table.qp,
1204                         qp->qpn & (dev->limits.num_qps - 1), qp);
1205         spin_unlock_irq(&dev->qp_table.lock);
1206
1207         return 0;
1208 }
1209
1210 int mthca_alloc_sqp(struct mthca_dev *dev,
1211                     struct mthca_pd *pd,
1212                     struct mthca_cq *send_cq,
1213                     struct mthca_cq *recv_cq,
1214                     enum ib_sig_type send_policy,
1215                     struct ib_qp_cap *cap,
1216                     int qpn,
1217                     int port,
1218                     struct mthca_sqp *sqp)
1219 {
1220         u32 mqpn = qpn * 2 + dev->qp_table.sqp_start + port - 1;
1221         int err;
1222
1223         err = mthca_set_qp_size(dev, cap, pd, &sqp->qp);
1224         if (err)
1225                 return err;
1226
1227         sqp->header_buf_size = sqp->qp.sq.max * MTHCA_UD_HEADER_SIZE;
1228         sqp->header_buf = dma_alloc_coherent(&dev->pdev->dev, sqp->header_buf_size,
1229                                              &sqp->header_dma, GFP_KERNEL);
1230         if (!sqp->header_buf)
1231                 return -ENOMEM;
1232
1233         spin_lock_irq(&dev->qp_table.lock);
1234         if (mthca_array_get(&dev->qp_table.qp, mqpn))
1235                 err = -EBUSY;
1236         else
1237                 mthca_array_set(&dev->qp_table.qp, mqpn, sqp);
1238         spin_unlock_irq(&dev->qp_table.lock);
1239
1240         if (err)
1241                 goto err_out;
1242
1243         sqp->port = port;
1244         sqp->qp.qpn       = mqpn;
1245         sqp->qp.transport = MLX;
1246
1247         err = mthca_alloc_qp_common(dev, pd, send_cq, recv_cq,
1248                                     send_policy, &sqp->qp);
1249         if (err)
1250                 goto err_out_free;
1251
1252         atomic_inc(&pd->sqp_count);
1253
1254         return 0;
1255
1256  err_out_free:
1257         /*
1258          * Lock CQs here, so that CQ polling code can do QP lookup
1259          * without taking a lock.
1260          */
1261         spin_lock_irq(&send_cq->lock);
1262         if (send_cq != recv_cq)
1263                 spin_lock(&recv_cq->lock);
1264
1265         spin_lock(&dev->qp_table.lock);
1266         mthca_array_clear(&dev->qp_table.qp, mqpn);
1267         spin_unlock(&dev->qp_table.lock);
1268
1269         if (send_cq != recv_cq)
1270                 spin_unlock(&recv_cq->lock);
1271         spin_unlock_irq(&send_cq->lock);
1272
1273  err_out:
1274         dma_free_coherent(&dev->pdev->dev, sqp->header_buf_size,
1275                           sqp->header_buf, sqp->header_dma);
1276
1277         return err;
1278 }
1279
1280 void mthca_free_qp(struct mthca_dev *dev,
1281                    struct mthca_qp *qp)
1282 {
1283         u8 status;
1284         struct mthca_cq *send_cq;
1285         struct mthca_cq *recv_cq;
1286
1287         send_cq = to_mcq(qp->ibqp.send_cq);
1288         recv_cq = to_mcq(qp->ibqp.recv_cq);
1289
1290         /*
1291          * Lock CQs here, so that CQ polling code can do QP lookup
1292          * without taking a lock.
1293          */
1294         spin_lock_irq(&send_cq->lock);
1295         if (send_cq != recv_cq)
1296                 spin_lock(&recv_cq->lock);
1297
1298         spin_lock(&dev->qp_table.lock);
1299         mthca_array_clear(&dev->qp_table.qp,
1300                           qp->qpn & (dev->limits.num_qps - 1));
1301         spin_unlock(&dev->qp_table.lock);
1302
1303         if (send_cq != recv_cq)
1304                 spin_unlock(&recv_cq->lock);
1305         spin_unlock_irq(&send_cq->lock);
1306
1307         atomic_dec(&qp->refcount);
1308         wait_event(qp->wait, !atomic_read(&qp->refcount));
1309
1310         if (qp->state != IB_QPS_RESET)
1311                 mthca_MODIFY_QP(dev, qp->state, IB_QPS_RESET, qp->qpn, 0,
1312                                 NULL, 0, &status);
1313
1314         /*
1315          * If this is a userspace QP, the buffers, MR, CQs and so on
1316          * will be cleaned up in userspace, so all we have to do is
1317          * unref the mem-free tables and free the QPN in our table.
1318          */
1319         if (!qp->ibqp.uobject) {
1320                 mthca_cq_clean(dev, to_mcq(qp->ibqp.send_cq)->cqn, qp->qpn,
1321                                qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
1322                 if (qp->ibqp.send_cq != qp->ibqp.recv_cq)
1323                         mthca_cq_clean(dev, to_mcq(qp->ibqp.recv_cq)->cqn, qp->qpn,
1324                                        qp->ibqp.srq ? to_msrq(qp->ibqp.srq) : NULL);
1325
1326                 mthca_free_memfree(dev, qp);
1327                 mthca_free_wqe_buf(dev, qp);
1328         }
1329
1330         mthca_unmap_memfree(dev, qp);
1331
1332         if (is_sqp(dev, qp)) {
1333                 atomic_dec(&(to_mpd(qp->ibqp.pd)->sqp_count));
1334                 dma_free_coherent(&dev->pdev->dev,
1335                                   to_msqp(qp)->header_buf_size,
1336                                   to_msqp(qp)->header_buf,
1337                                   to_msqp(qp)->header_dma);
1338         } else
1339                 mthca_free(&dev->qp_table.alloc, qp->qpn);
1340 }
1341
1342 /* Create UD header for an MLX send and build a data segment for it */
1343 static int build_mlx_header(struct mthca_dev *dev, struct mthca_sqp *sqp,
1344                             int ind, struct ib_send_wr *wr,
1345                             struct mthca_mlx_seg *mlx,
1346                             struct mthca_data_seg *data)
1347 {
1348         int header_size;
1349         int err;
1350         u16 pkey;
1351
1352         ib_ud_header_init(256, /* assume a MAD */
1353                           mthca_ah_grh_present(to_mah(wr->wr.ud.ah)),
1354                           &sqp->ud_header);
1355
1356         err = mthca_read_ah(dev, to_mah(wr->wr.ud.ah), &sqp->ud_header);
1357         if (err)
1358                 return err;
1359         mlx->flags &= ~cpu_to_be32(MTHCA_NEXT_SOLICIT | 1);
1360         mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MTHCA_MLX_VL15 : 0) |
1361                                   (sqp->ud_header.lrh.destination_lid ==
1362                                    IB_LID_PERMISSIVE ? MTHCA_MLX_SLR : 0) |
1363                                   (sqp->ud_header.lrh.service_level << 8));
1364         mlx->rlid = sqp->ud_header.lrh.destination_lid;
1365         mlx->vcrc = 0;
1366
1367         switch (wr->opcode) {
1368         case IB_WR_SEND:
1369                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1370                 sqp->ud_header.immediate_present = 0;
1371                 break;
1372         case IB_WR_SEND_WITH_IMM:
1373                 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1374                 sqp->ud_header.immediate_present = 1;
1375                 sqp->ud_header.immediate_data = wr->imm_data;
1376                 break;
1377         default:
1378                 return -EINVAL;
1379         }
1380
1381         sqp->ud_header.lrh.virtual_lane    = !sqp->qp.ibqp.qp_num ? 15 : 0;
1382         if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1383                 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1384         sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1385         if (!sqp->qp.ibqp.qp_num)
1386                 ib_get_cached_pkey(&dev->ib_dev, sqp->port,
1387                                    sqp->pkey_index, &pkey);
1388         else
1389                 ib_get_cached_pkey(&dev->ib_dev, sqp->port,
1390                                    wr->wr.ud.pkey_index, &pkey);
1391         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1392         sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1393         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1394         sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1395                                                sqp->qkey : wr->wr.ud.remote_qkey);
1396         sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1397
1398         header_size = ib_ud_header_pack(&sqp->ud_header,
1399                                         sqp->header_buf +
1400                                         ind * MTHCA_UD_HEADER_SIZE);
1401
1402         data->byte_count = cpu_to_be32(header_size);
1403         data->lkey       = cpu_to_be32(to_mpd(sqp->qp.ibqp.pd)->ntmr.ibmr.lkey);
1404         data->addr       = cpu_to_be64(sqp->header_dma +
1405                                        ind * MTHCA_UD_HEADER_SIZE);
1406
1407         return 0;
1408 }
1409
1410 static inline int mthca_wq_overflow(struct mthca_wq *wq, int nreq,
1411                                     struct ib_cq *ib_cq)
1412 {
1413         unsigned cur;
1414         struct mthca_cq *cq;
1415
1416         cur = wq->head - wq->tail;
1417         if (likely(cur + nreq < wq->max))
1418                 return 0;
1419
1420         cq = to_mcq(ib_cq);
1421         spin_lock(&cq->lock);
1422         cur = wq->head - wq->tail;
1423         spin_unlock(&cq->lock);
1424
1425         return cur + nreq >= wq->max;
1426 }
1427
1428 int mthca_tavor_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1429                           struct ib_send_wr **bad_wr)
1430 {
1431         struct mthca_dev *dev = to_mdev(ibqp->device);
1432         struct mthca_qp *qp = to_mqp(ibqp);
1433         void *wqe;
1434         void *prev_wqe;
1435         unsigned long flags;
1436         int err = 0;
1437         int nreq;
1438         int i;
1439         int size;
1440         int size0 = 0;
1441         u32 f0 = 0;
1442         int ind;
1443         u8 op0 = 0;
1444
1445         spin_lock_irqsave(&qp->sq.lock, flags);
1446
1447         /* XXX check that state is OK to post send */
1448
1449         ind = qp->sq.next_ind;
1450
1451         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1452                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1453                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1454                                         " %d max, %d nreq)\n", qp->qpn,
1455                                         qp->sq.head, qp->sq.tail,
1456                                         qp->sq.max, nreq);
1457                         err = -ENOMEM;
1458                         *bad_wr = wr;
1459                         goto out;
1460                 }
1461
1462                 wqe = get_send_wqe(qp, ind);
1463                 prev_wqe = qp->sq.last;
1464                 qp->sq.last = wqe;
1465
1466                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
1467                 ((struct mthca_next_seg *) wqe)->ee_nds = 0;
1468                 ((struct mthca_next_seg *) wqe)->flags =
1469                         ((wr->send_flags & IB_SEND_SIGNALED) ?
1470                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
1471                         ((wr->send_flags & IB_SEND_SOLICITED) ?
1472                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
1473                         cpu_to_be32(1);
1474                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1475                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1476                         ((struct mthca_next_seg *) wqe)->imm = wr->imm_data;
1477
1478                 wqe += sizeof (struct mthca_next_seg);
1479                 size = sizeof (struct mthca_next_seg) / 16;
1480
1481                 switch (qp->transport) {
1482                 case RC:
1483                         switch (wr->opcode) {
1484                         case IB_WR_ATOMIC_CMP_AND_SWP:
1485                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1486                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1487                                         cpu_to_be64(wr->wr.atomic.remote_addr);
1488                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1489                                         cpu_to_be32(wr->wr.atomic.rkey);
1490                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1491
1492                                 wqe += sizeof (struct mthca_raddr_seg);
1493
1494                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1495                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1496                                                 cpu_to_be64(wr->wr.atomic.swap);
1497                                         ((struct mthca_atomic_seg *) wqe)->compare =
1498                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1499                                 } else {
1500                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1501                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1502                                         ((struct mthca_atomic_seg *) wqe)->compare = 0;
1503                                 }
1504
1505                                 wqe += sizeof (struct mthca_atomic_seg);
1506                                 size += (sizeof (struct mthca_raddr_seg) +
1507                                          sizeof (struct mthca_atomic_seg)) / 16;
1508                                 break;
1509
1510                         case IB_WR_RDMA_WRITE:
1511                         case IB_WR_RDMA_WRITE_WITH_IMM:
1512                         case IB_WR_RDMA_READ:
1513                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1514                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1515                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1516                                         cpu_to_be32(wr->wr.rdma.rkey);
1517                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1518                                 wqe += sizeof (struct mthca_raddr_seg);
1519                                 size += sizeof (struct mthca_raddr_seg) / 16;
1520                                 break;
1521
1522                         default:
1523                                 /* No extra segments required for sends */
1524                                 break;
1525                         }
1526
1527                         break;
1528
1529                 case UC:
1530                         switch (wr->opcode) {
1531                         case IB_WR_RDMA_WRITE:
1532                         case IB_WR_RDMA_WRITE_WITH_IMM:
1533                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1534                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1535                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1536                                         cpu_to_be32(wr->wr.rdma.rkey);
1537                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1538                                 wqe += sizeof (struct mthca_raddr_seg);
1539                                 size += sizeof (struct mthca_raddr_seg) / 16;
1540                                 break;
1541
1542                         default:
1543                                 /* No extra segments required for sends */
1544                                 break;
1545                         }
1546
1547                         break;
1548
1549                 case UD:
1550                         ((struct mthca_tavor_ud_seg *) wqe)->lkey =
1551                                 cpu_to_be32(to_mah(wr->wr.ud.ah)->key);
1552                         ((struct mthca_tavor_ud_seg *) wqe)->av_addr =
1553                                 cpu_to_be64(to_mah(wr->wr.ud.ah)->avdma);
1554                         ((struct mthca_tavor_ud_seg *) wqe)->dqpn =
1555                                 cpu_to_be32(wr->wr.ud.remote_qpn);
1556                         ((struct mthca_tavor_ud_seg *) wqe)->qkey =
1557                                 cpu_to_be32(wr->wr.ud.remote_qkey);
1558
1559                         wqe += sizeof (struct mthca_tavor_ud_seg);
1560                         size += sizeof (struct mthca_tavor_ud_seg) / 16;
1561                         break;
1562
1563                 case MLX:
1564                         err = build_mlx_header(dev, to_msqp(qp), ind, wr,
1565                                                wqe - sizeof (struct mthca_next_seg),
1566                                                wqe);
1567                         if (err) {
1568                                 *bad_wr = wr;
1569                                 goto out;
1570                         }
1571                         wqe += sizeof (struct mthca_data_seg);
1572                         size += sizeof (struct mthca_data_seg) / 16;
1573                         break;
1574                 }
1575
1576                 if (wr->num_sge > qp->sq.max_gs) {
1577                         mthca_err(dev, "too many gathers\n");
1578                         err = -EINVAL;
1579                         *bad_wr = wr;
1580                         goto out;
1581                 }
1582
1583                 for (i = 0; i < wr->num_sge; ++i) {
1584                         ((struct mthca_data_seg *) wqe)->byte_count =
1585                                 cpu_to_be32(wr->sg_list[i].length);
1586                         ((struct mthca_data_seg *) wqe)->lkey =
1587                                 cpu_to_be32(wr->sg_list[i].lkey);
1588                         ((struct mthca_data_seg *) wqe)->addr =
1589                                 cpu_to_be64(wr->sg_list[i].addr);
1590                         wqe += sizeof (struct mthca_data_seg);
1591                         size += sizeof (struct mthca_data_seg) / 16;
1592                 }
1593
1594                 /* Add one more inline data segment for ICRC */
1595                 if (qp->transport == MLX) {
1596                         ((struct mthca_data_seg *) wqe)->byte_count =
1597                                 cpu_to_be32((1 << 31) | 4);
1598                         ((u32 *) wqe)[1] = 0;
1599                         wqe += sizeof (struct mthca_data_seg);
1600                         size += sizeof (struct mthca_data_seg) / 16;
1601                 }
1602
1603                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
1604
1605                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
1606                         mthca_err(dev, "opcode invalid\n");
1607                         err = -EINVAL;
1608                         *bad_wr = wr;
1609                         goto out;
1610                 }
1611
1612                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1613                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
1614                                      qp->send_wqe_offset) |
1615                                     mthca_opcode[wr->opcode]);
1616                 wmb();
1617                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1618                         cpu_to_be32((size0 ? 0 : MTHCA_NEXT_DBD) | size |
1619                                     ((wr->send_flags & IB_SEND_FENCE) ?
1620                                     MTHCA_NEXT_FENCE : 0));
1621
1622                 if (!size0) {
1623                         size0 = size;
1624                         op0   = mthca_opcode[wr->opcode];
1625                 }
1626
1627                 ++ind;
1628                 if (unlikely(ind >= qp->sq.max))
1629                         ind -= qp->sq.max;
1630         }
1631
1632 out:
1633         if (likely(nreq)) {
1634                 __be32 doorbell[2];
1635
1636                 doorbell[0] = cpu_to_be32(((qp->sq.next_ind << qp->sq.wqe_shift) +
1637                                            qp->send_wqe_offset) | f0 | op0);
1638                 doorbell[1] = cpu_to_be32((qp->qpn << 8) | size0);
1639
1640                 wmb();
1641
1642                 mthca_write64(doorbell,
1643                               dev->kar + MTHCA_SEND_DOORBELL,
1644                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1645         }
1646
1647         qp->sq.next_ind = ind;
1648         qp->sq.head    += nreq;
1649
1650         spin_unlock_irqrestore(&qp->sq.lock, flags);
1651         return err;
1652 }
1653
1654 int mthca_tavor_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1655                              struct ib_recv_wr **bad_wr)
1656 {
1657         struct mthca_dev *dev = to_mdev(ibqp->device);
1658         struct mthca_qp *qp = to_mqp(ibqp);
1659         __be32 doorbell[2];
1660         unsigned long flags;
1661         int err = 0;
1662         int nreq;
1663         int i;
1664         int size;
1665         int size0 = 0;
1666         int ind;
1667         void *wqe;
1668         void *prev_wqe;
1669
1670         spin_lock_irqsave(&qp->rq.lock, flags);
1671
1672         /* XXX check that state is OK to post receive */
1673
1674         ind = qp->rq.next_ind;
1675
1676         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1677                 if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) {
1678                         nreq = 0;
1679
1680                         doorbell[0] = cpu_to_be32((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
1681                         doorbell[1] = cpu_to_be32(qp->qpn << 8);
1682
1683                         wmb();
1684
1685                         mthca_write64(doorbell,
1686                                       dev->kar + MTHCA_RECEIVE_DOORBELL,
1687                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1688
1689                         qp->rq.head += MTHCA_TAVOR_MAX_WQES_PER_RECV_DB;
1690                         size0 = 0;
1691                 }
1692
1693                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1694                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
1695                                         " %d max, %d nreq)\n", qp->qpn,
1696                                         qp->rq.head, qp->rq.tail,
1697                                         qp->rq.max, nreq);
1698                         err = -ENOMEM;
1699                         *bad_wr = wr;
1700                         goto out;
1701                 }
1702
1703                 wqe = get_recv_wqe(qp, ind);
1704                 prev_wqe = qp->rq.last;
1705                 qp->rq.last = wqe;
1706
1707                 ((struct mthca_next_seg *) wqe)->nda_op = 0;
1708                 ((struct mthca_next_seg *) wqe)->ee_nds =
1709                         cpu_to_be32(MTHCA_NEXT_DBD);
1710                 ((struct mthca_next_seg *) wqe)->flags = 0;
1711
1712                 wqe += sizeof (struct mthca_next_seg);
1713                 size = sizeof (struct mthca_next_seg) / 16;
1714
1715                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1716                         err = -EINVAL;
1717                         *bad_wr = wr;
1718                         goto out;
1719                 }
1720
1721                 for (i = 0; i < wr->num_sge; ++i) {
1722                         ((struct mthca_data_seg *) wqe)->byte_count =
1723                                 cpu_to_be32(wr->sg_list[i].length);
1724                         ((struct mthca_data_seg *) wqe)->lkey =
1725                                 cpu_to_be32(wr->sg_list[i].lkey);
1726                         ((struct mthca_data_seg *) wqe)->addr =
1727                                 cpu_to_be64(wr->sg_list[i].addr);
1728                         wqe += sizeof (struct mthca_data_seg);
1729                         size += sizeof (struct mthca_data_seg) / 16;
1730                 }
1731
1732                 qp->wrid[ind] = wr->wr_id;
1733
1734                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1735                         cpu_to_be32((ind << qp->rq.wqe_shift) | 1);
1736                 wmb();
1737                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1738                         cpu_to_be32(MTHCA_NEXT_DBD | size);
1739
1740                 if (!size0)
1741                         size0 = size;
1742
1743                 ++ind;
1744                 if (unlikely(ind >= qp->rq.max))
1745                         ind -= qp->rq.max;
1746         }
1747
1748 out:
1749         if (likely(nreq)) {
1750                 doorbell[0] = cpu_to_be32((qp->rq.next_ind << qp->rq.wqe_shift) | size0);
1751                 doorbell[1] = cpu_to_be32((qp->qpn << 8) | nreq);
1752
1753                 wmb();
1754
1755                 mthca_write64(doorbell,
1756                               dev->kar + MTHCA_RECEIVE_DOORBELL,
1757                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1758         }
1759
1760         qp->rq.next_ind = ind;
1761         qp->rq.head    += nreq;
1762
1763         spin_unlock_irqrestore(&qp->rq.lock, flags);
1764         return err;
1765 }
1766
1767 int mthca_arbel_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1768                           struct ib_send_wr **bad_wr)
1769 {
1770         struct mthca_dev *dev = to_mdev(ibqp->device);
1771         struct mthca_qp *qp = to_mqp(ibqp);
1772         __be32 doorbell[2];
1773         void *wqe;
1774         void *prev_wqe;
1775         unsigned long flags;
1776         int err = 0;
1777         int nreq;
1778         int i;
1779         int size;
1780         int size0 = 0;
1781         u32 f0 = 0;
1782         int ind;
1783         u8 op0 = 0;
1784
1785         spin_lock_irqsave(&qp->sq.lock, flags);
1786
1787         /* XXX check that state is OK to post send */
1788
1789         ind = qp->sq.head & (qp->sq.max - 1);
1790
1791         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1792                 if (unlikely(nreq == MTHCA_ARBEL_MAX_WQES_PER_SEND_DB)) {
1793                         nreq = 0;
1794
1795                         doorbell[0] = cpu_to_be32((MTHCA_ARBEL_MAX_WQES_PER_SEND_DB << 24) |
1796                                                   ((qp->sq.head & 0xffff) << 8) |
1797                                                   f0 | op0);
1798                         doorbell[1] = cpu_to_be32((qp->qpn << 8) | size0);
1799
1800                         qp->sq.head += MTHCA_ARBEL_MAX_WQES_PER_SEND_DB;
1801                         size0 = 0;
1802
1803                         /*
1804                          * Make sure that descriptors are written before
1805                          * doorbell record.
1806                          */
1807                         wmb();
1808                         *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
1809
1810                         /*
1811                          * Make sure doorbell record is written before we
1812                          * write MMIO send doorbell.
1813                          */
1814                         wmb();
1815                         mthca_write64(doorbell,
1816                                       dev->kar + MTHCA_SEND_DOORBELL,
1817                                       MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
1818                 }
1819
1820                 if (mthca_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1821                         mthca_err(dev, "SQ %06x full (%u head, %u tail,"
1822                                         " %d max, %d nreq)\n", qp->qpn,
1823                                         qp->sq.head, qp->sq.tail,
1824                                         qp->sq.max, nreq);
1825                         err = -ENOMEM;
1826                         *bad_wr = wr;
1827                         goto out;
1828                 }
1829
1830                 wqe = get_send_wqe(qp, ind);
1831                 prev_wqe = qp->sq.last;
1832                 qp->sq.last = wqe;
1833
1834                 ((struct mthca_next_seg *) wqe)->flags =
1835                         ((wr->send_flags & IB_SEND_SIGNALED) ?
1836                          cpu_to_be32(MTHCA_NEXT_CQ_UPDATE) : 0) |
1837                         ((wr->send_flags & IB_SEND_SOLICITED) ?
1838                          cpu_to_be32(MTHCA_NEXT_SOLICIT) : 0)   |
1839                         cpu_to_be32(1);
1840                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1841                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1842                         ((struct mthca_next_seg *) wqe)->imm = wr->imm_data;
1843
1844                 wqe += sizeof (struct mthca_next_seg);
1845                 size = sizeof (struct mthca_next_seg) / 16;
1846
1847                 switch (qp->transport) {
1848                 case RC:
1849                         switch (wr->opcode) {
1850                         case IB_WR_ATOMIC_CMP_AND_SWP:
1851                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1852                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1853                                         cpu_to_be64(wr->wr.atomic.remote_addr);
1854                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1855                                         cpu_to_be32(wr->wr.atomic.rkey);
1856                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1857
1858                                 wqe += sizeof (struct mthca_raddr_seg);
1859
1860                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1861                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1862                                                 cpu_to_be64(wr->wr.atomic.swap);
1863                                         ((struct mthca_atomic_seg *) wqe)->compare =
1864                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1865                                 } else {
1866                                         ((struct mthca_atomic_seg *) wqe)->swap_add =
1867                                                 cpu_to_be64(wr->wr.atomic.compare_add);
1868                                         ((struct mthca_atomic_seg *) wqe)->compare = 0;
1869                                 }
1870
1871                                 wqe += sizeof (struct mthca_atomic_seg);
1872                                 size += (sizeof (struct mthca_raddr_seg) +
1873                                          sizeof (struct mthca_atomic_seg)) / 16;
1874                                 break;
1875
1876                         case IB_WR_RDMA_READ:
1877                         case IB_WR_RDMA_WRITE:
1878                         case IB_WR_RDMA_WRITE_WITH_IMM:
1879                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1880                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1881                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1882                                         cpu_to_be32(wr->wr.rdma.rkey);
1883                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1884                                 wqe += sizeof (struct mthca_raddr_seg);
1885                                 size += sizeof (struct mthca_raddr_seg) / 16;
1886                                 break;
1887
1888                         default:
1889                                 /* No extra segments required for sends */
1890                                 break;
1891                         }
1892
1893                         break;
1894
1895                 case UC:
1896                         switch (wr->opcode) {
1897                         case IB_WR_RDMA_WRITE:
1898                         case IB_WR_RDMA_WRITE_WITH_IMM:
1899                                 ((struct mthca_raddr_seg *) wqe)->raddr =
1900                                         cpu_to_be64(wr->wr.rdma.remote_addr);
1901                                 ((struct mthca_raddr_seg *) wqe)->rkey =
1902                                         cpu_to_be32(wr->wr.rdma.rkey);
1903                                 ((struct mthca_raddr_seg *) wqe)->reserved = 0;
1904                                 wqe += sizeof (struct mthca_raddr_seg);
1905                                 size += sizeof (struct mthca_raddr_seg) / 16;
1906                                 break;
1907
1908                         default:
1909                                 /* No extra segments required for sends */
1910                                 break;
1911                         }
1912
1913                         break;
1914
1915                 case UD:
1916                         memcpy(((struct mthca_arbel_ud_seg *) wqe)->av,
1917                                to_mah(wr->wr.ud.ah)->av, MTHCA_AV_SIZE);
1918                         ((struct mthca_arbel_ud_seg *) wqe)->dqpn =
1919                                 cpu_to_be32(wr->wr.ud.remote_qpn);
1920                         ((struct mthca_arbel_ud_seg *) wqe)->qkey =
1921                                 cpu_to_be32(wr->wr.ud.remote_qkey);
1922
1923                         wqe += sizeof (struct mthca_arbel_ud_seg);
1924                         size += sizeof (struct mthca_arbel_ud_seg) / 16;
1925                         break;
1926
1927                 case MLX:
1928                         err = build_mlx_header(dev, to_msqp(qp), ind, wr,
1929                                                wqe - sizeof (struct mthca_next_seg),
1930                                                wqe);
1931                         if (err) {
1932                                 *bad_wr = wr;
1933                                 goto out;
1934                         }
1935                         wqe += sizeof (struct mthca_data_seg);
1936                         size += sizeof (struct mthca_data_seg) / 16;
1937                         break;
1938                 }
1939
1940                 if (wr->num_sge > qp->sq.max_gs) {
1941                         mthca_err(dev, "too many gathers\n");
1942                         err = -EINVAL;
1943                         *bad_wr = wr;
1944                         goto out;
1945                 }
1946
1947                 for (i = 0; i < wr->num_sge; ++i) {
1948                         ((struct mthca_data_seg *) wqe)->byte_count =
1949                                 cpu_to_be32(wr->sg_list[i].length);
1950                         ((struct mthca_data_seg *) wqe)->lkey =
1951                                 cpu_to_be32(wr->sg_list[i].lkey);
1952                         ((struct mthca_data_seg *) wqe)->addr =
1953                                 cpu_to_be64(wr->sg_list[i].addr);
1954                         wqe += sizeof (struct mthca_data_seg);
1955                         size += sizeof (struct mthca_data_seg) / 16;
1956                 }
1957
1958                 /* Add one more inline data segment for ICRC */
1959                 if (qp->transport == MLX) {
1960                         ((struct mthca_data_seg *) wqe)->byte_count =
1961                                 cpu_to_be32((1 << 31) | 4);
1962                         ((u32 *) wqe)[1] = 0;
1963                         wqe += sizeof (struct mthca_data_seg);
1964                         size += sizeof (struct mthca_data_seg) / 16;
1965                 }
1966
1967                 qp->wrid[ind + qp->rq.max] = wr->wr_id;
1968
1969                 if (wr->opcode >= ARRAY_SIZE(mthca_opcode)) {
1970                         mthca_err(dev, "opcode invalid\n");
1971                         err = -EINVAL;
1972                         *bad_wr = wr;
1973                         goto out;
1974                 }
1975
1976                 ((struct mthca_next_seg *) prev_wqe)->nda_op =
1977                         cpu_to_be32(((ind << qp->sq.wqe_shift) +
1978                                      qp->send_wqe_offset) |
1979                                     mthca_opcode[wr->opcode]);
1980                 wmb();
1981                 ((struct mthca_next_seg *) prev_wqe)->ee_nds =
1982                         cpu_to_be32(MTHCA_NEXT_DBD | size |
1983                                     ((wr->send_flags & IB_SEND_FENCE) ?
1984                                     MTHCA_NEXT_FENCE : 0));
1985
1986                 if (!size0) {
1987                         size0 = size;
1988                         op0   = mthca_opcode[wr->opcode];
1989                 }
1990
1991                 ++ind;
1992                 if (unlikely(ind >= qp->sq.max))
1993                         ind -= qp->sq.max;
1994         }
1995
1996 out:
1997         if (likely(nreq)) {
1998                 doorbell[0] = cpu_to_be32((nreq << 24)                  |
1999                                           ((qp->sq.head & 0xffff) << 8) |
2000                                           f0 | op0);
2001                 doorbell[1] = cpu_to_be32((qp->qpn << 8) | size0);
2002
2003                 qp->sq.head += nreq;
2004
2005                 /*
2006                  * Make sure that descriptors are written before
2007                  * doorbell record.
2008                  */
2009                 wmb();
2010                 *qp->sq.db = cpu_to_be32(qp->sq.head & 0xffff);
2011
2012                 /*
2013                  * Make sure doorbell record is written before we
2014                  * write MMIO send doorbell.
2015                  */
2016                 wmb();
2017                 mthca_write64(doorbell,
2018                               dev->kar + MTHCA_SEND_DOORBELL,
2019                               MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
2020         }
2021
2022         spin_unlock_irqrestore(&qp->sq.lock, flags);
2023         return err;
2024 }
2025
2026 int mthca_arbel_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *wr,
2027                              struct ib_recv_wr **bad_wr)
2028 {
2029         struct mthca_dev *dev = to_mdev(ibqp->device);
2030         struct mthca_qp *qp = to_mqp(ibqp);
2031         unsigned long flags;
2032         int err = 0;
2033         int nreq;
2034         int ind;
2035         int i;
2036         void *wqe;
2037
2038         spin_lock_irqsave(&qp->rq.lock, flags);
2039
2040         /* XXX check that state is OK to post receive */
2041
2042         ind = qp->rq.head & (qp->rq.max - 1);
2043
2044         for (nreq = 0; wr; ++nreq, wr = wr->next) {
2045                 if (mthca_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
2046                         mthca_err(dev, "RQ %06x full (%u head, %u tail,"
2047                                         " %d max, %d nreq)\n", qp->qpn,
2048                                         qp->rq.head, qp->rq.tail,
2049                                         qp->rq.max, nreq);
2050                         err = -ENOMEM;
2051                         *bad_wr = wr;
2052                         goto out;
2053                 }
2054
2055                 wqe = get_recv_wqe(qp, ind);
2056
2057                 ((struct mthca_next_seg *) wqe)->flags = 0;
2058
2059                 wqe += sizeof (struct mthca_next_seg);
2060
2061                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
2062                         err = -EINVAL;
2063                         *bad_wr = wr;
2064                         goto out;
2065                 }
2066
2067                 for (i = 0; i < wr->num_sge; ++i) {
2068                         ((struct mthca_data_seg *) wqe)->byte_count =
2069                                 cpu_to_be32(wr->sg_list[i].length);
2070                         ((struct mthca_data_seg *) wqe)->lkey =
2071                                 cpu_to_be32(wr->sg_list[i].lkey);
2072                         ((struct mthca_data_seg *) wqe)->addr =
2073                                 cpu_to_be64(wr->sg_list[i].addr);
2074                         wqe += sizeof (struct mthca_data_seg);
2075                 }
2076
2077                 if (i < qp->rq.max_gs) {
2078                         ((struct mthca_data_seg *) wqe)->byte_count = 0;
2079                         ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY);
2080                         ((struct mthca_data_seg *) wqe)->addr = 0;
2081                 }
2082
2083                 qp->wrid[ind] = wr->wr_id;
2084
2085                 ++ind;
2086                 if (unlikely(ind >= qp->rq.max))
2087                         ind -= qp->rq.max;
2088         }
2089 out:
2090         if (likely(nreq)) {
2091                 qp->rq.head += nreq;
2092
2093                 /*
2094                  * Make sure that descriptors are written before
2095                  * doorbell record.
2096                  */
2097                 wmb();
2098                 *qp->rq.db = cpu_to_be32(qp->rq.head & 0xffff);
2099         }
2100
2101         spin_unlock_irqrestore(&qp->rq.lock, flags);
2102         return err;
2103 }
2104
2105 void mthca_free_err_wqe(struct mthca_dev *dev, struct mthca_qp *qp, int is_send,
2106                         int index, int *dbd, __be32 *new_wqe)
2107 {
2108         struct mthca_next_seg *next;
2109
2110         /*
2111          * For SRQs, all WQEs generate a CQE, so we're always at the
2112          * end of the doorbell chain.
2113          */
2114         if (qp->ibqp.srq) {
2115                 *new_wqe = 0;
2116                 return;
2117         }
2118
2119         if (is_send)
2120                 next = get_send_wqe(qp, index);
2121         else
2122                 next = get_recv_wqe(qp, index);
2123
2124         *dbd = !!(next->ee_nds & cpu_to_be32(MTHCA_NEXT_DBD));
2125         if (next->ee_nds & cpu_to_be32(0x3f))
2126                 *new_wqe = (next->nda_op & cpu_to_be32(~0x3f)) |
2127                         (next->ee_nds & cpu_to_be32(0x3f));
2128         else
2129                 *new_wqe = 0;
2130 }
2131
2132 int __devinit mthca_init_qp_table(struct mthca_dev *dev)
2133 {
2134         int err;
2135         u8 status;
2136         int i;
2137
2138         spin_lock_init(&dev->qp_table.lock);
2139
2140         /*
2141          * We reserve 2 extra QPs per port for the special QPs.  The
2142          * special QP for port 1 has to be even, so round up.
2143          */
2144         dev->qp_table.sqp_start = (dev->limits.reserved_qps + 1) & ~1UL;
2145         err = mthca_alloc_init(&dev->qp_table.alloc,
2146                                dev->limits.num_qps,
2147                                (1 << 24) - 1,
2148                                dev->qp_table.sqp_start +
2149                                MTHCA_MAX_PORTS * 2);
2150         if (err)
2151                 return err;
2152
2153         err = mthca_array_init(&dev->qp_table.qp,
2154                                dev->limits.num_qps);
2155         if (err) {
2156                 mthca_alloc_cleanup(&dev->qp_table.alloc);
2157                 return err;
2158         }
2159
2160         for (i = 0; i < 2; ++i) {
2161                 err = mthca_CONF_SPECIAL_QP(dev, i ? IB_QPT_GSI : IB_QPT_SMI,
2162                                             dev->qp_table.sqp_start + i * 2,
2163                                             &status);
2164                 if (err)
2165                         goto err_out;
2166                 if (status) {
2167                         mthca_warn(dev, "CONF_SPECIAL_QP returned "
2168                                    "status %02x, aborting.\n",
2169                                    status);
2170                         err = -EINVAL;
2171                         goto err_out;
2172                 }
2173         }
2174         return 0;
2175
2176  err_out:
2177         for (i = 0; i < 2; ++i)
2178                 mthca_CONF_SPECIAL_QP(dev, i, 0, &status);
2179
2180         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2181         mthca_alloc_cleanup(&dev->qp_table.alloc);
2182
2183         return err;
2184 }
2185
2186 void __devexit mthca_cleanup_qp_table(struct mthca_dev *dev)
2187 {
2188         int i;
2189         u8 status;
2190
2191         for (i = 0; i < 2; ++i)
2192                 mthca_CONF_SPECIAL_QP(dev, i, 0, &status);
2193
2194         mthca_array_cleanup(&dev->qp_table.qp, dev->limits.num_qps);
2195         mthca_alloc_cleanup(&dev->qp_table.alloc);
2196 }