drivers/infiniband/hw/mlx4/qp.c

   1 /*
   2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
   3  * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/log2.h>
  35 #include <linux/slab.h>
  36 #include <linux/netdevice.h>
  37
  38 #include <rdma/ib_cache.h>
  39 #include <rdma/ib_pack.h>
  40 #include <rdma/ib_addr.h>
  41
  42 #include <linux/mlx4/qp.h>
  43
  44 #include "mlx4_ib.h"
  45 #include "user.h"
  46
  47 enum {
  48         MLX4_IB_ACK_REQ_FREQ    = 8,
  49 };
  50
  51 enum {
  52         MLX4_IB_DEFAULT_SCHED_QUEUE     = 0x83,
  53         MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f,
  54         MLX4_IB_LINK_TYPE_IB            = 0,
  55         MLX4_IB_LINK_TYPE_ETH           = 1
  56 };
  57
  58 enum {
  59         /*
  60          * Largest possible UD header: send with GRH and immediate
  61          * data plus 18 bytes for an Ethernet header with VLAN/802.1Q
  62          * tag.  (LRH would only use 8 bytes, so Ethernet is the
  63          * biggest case)
  64          */
  65         MLX4_IB_UD_HEADER_SIZE          = 82,
  66         MLX4_IB_LSO_HEADER_SPARE        = 128,
  67 };
  68
  69 enum {
  70         MLX4_IB_IBOE_ETHERTYPE          = 0x8915
  71 };
  72
  73 struct mlx4_ib_sqp {
  74         struct mlx4_ib_qp       qp;
  75         int                     pkey_index;
  76         u32                     qkey;
  77         u32                     send_psn;
  78         struct ib_ud_header     ud_header;
  79         u8                      header_buf[MLX4_IB_UD_HEADER_SIZE];
  80 };
  81
  82 enum {
  83         MLX4_IB_MIN_SQ_STRIDE   = 6,
  84         MLX4_IB_CACHE_LINE_SIZE = 64,
  85 };
  86
  87 static const __be32 mlx4_ib_opcode[] = {
  88         [IB_WR_SEND]                            = cpu_to_be32(MLX4_OPCODE_SEND),
  89         [IB_WR_LSO]                             = cpu_to_be32(MLX4_OPCODE_LSO),
  90         [IB_WR_SEND_WITH_IMM]                   = cpu_to_be32(MLX4_OPCODE_SEND_IMM),
  91         [IB_WR_RDMA_WRITE]                      = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
  92         [IB_WR_RDMA_WRITE_WITH_IMM]             = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
  93         [IB_WR_RDMA_READ]                       = cpu_to_be32(MLX4_OPCODE_RDMA_READ),
  94         [IB_WR_ATOMIC_CMP_AND_SWP]              = cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
  95         [IB_WR_ATOMIC_FETCH_AND_ADD]            = cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
  96         [IB_WR_SEND_WITH_INV]                   = cpu_to_be32(MLX4_OPCODE_SEND_INVAL),
  97         [IB_WR_LOCAL_INV]                       = cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL),
  98         [IB_WR_FAST_REG_MR]                     = cpu_to_be32(MLX4_OPCODE_FMR),
  99         [IB_WR_MASKED_ATOMIC_CMP_AND_SWP]       = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_CS),
 100         [IB_WR_MASKED_ATOMIC_FETCH_AND_ADD]     = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_FA),
 101 };
 102
 103 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
 104 {
 105         return container_of(mqp, struct mlx4_ib_sqp, qp);
 106 }
 107
 108 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
 109 {
 110         return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
 111                 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3;
 112 }
 113
 114 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
 115 {
 116         return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
 117                 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1;
 118 }
 119
 120 static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
 121 {
 122         return mlx4_buf_offset(&qp->buf, offset);
 123 }
 124
 125 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
 126 {
 127         return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
 128 }
 129
 130 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
 131 {
 132         return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
 133 }
 134
 135 /*
 136  * Stamp a SQ WQE so that it is invalid if prefetched by marking the
 137  * first four bytes of every 64 byte chunk with
 138  *     0x7FFFFFF | (invalid_ownership_value << 31).
 139  *
 140  * When the max work request size is less than or equal to the WQE
 141  * basic block size, as an optimization, we can stamp all WQEs with
 142  * 0xffffffff, and skip the very first chunk of each WQE.
 143  */
 144 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size)
 145 {
 146         __be32 *wqe;
 147         int i;
 148         int s;
 149         int ind;
 150         void *buf;
 151         __be32 stamp;
 152         struct mlx4_wqe_ctrl_seg *ctrl;
 153
 154         if (qp->sq_max_wqes_per_wr > 1) {
 155                 s = roundup(size, 1U << qp->sq.wqe_shift);
 156                 for (i = 0; i < s; i += 64) {
 157                         ind = (i >> qp->sq.wqe_shift) + n;
 158                         stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) :
 159                                                        cpu_to_be32(0xffffffff);
 160                         buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
 161                         wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1));
 162                         *wqe = stamp;
 163                 }
 164         } else {
 165                 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
 166                 s = (ctrl->fence_size & 0x3f) << 4;
 167                 for (i = 64; i < s; i += 64) {
 168                         wqe = buf + i;
 169                         *wqe = cpu_to_be32(0xffffffff);
 170                 }
 171         }
 172 }
 173
 174 static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size)
 175 {
 176         struct mlx4_wqe_ctrl_seg *ctrl;
 177         struct mlx4_wqe_inline_seg *inl;
 178         void *wqe;
 179         int s;
 180
 181         ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
 182         s = sizeof(struct mlx4_wqe_ctrl_seg);
 183
 184         if (qp->ibqp.qp_type == IB_QPT_UD) {
 185                 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl;
 186                 struct mlx4_av *av = (struct mlx4_av *)dgram->av;
 187                 memset(dgram, 0, sizeof *dgram);
 188                 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn);
 189                 s += sizeof(struct mlx4_wqe_datagram_seg);
 190         }
 191
 192         /* Pad the remainder of the WQE with an inline data segment. */
 193         if (size > s) {
 194                 inl = wqe + s;
 195                 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl));
 196         }
 197         ctrl->srcrb_flags = 0;
 198         ctrl->fence_size = size / 16;
 199         /*
 200          * Make sure descriptor is fully written before setting ownership bit
 201          * (because HW can start executing as soon as we do).
 202          */
 203         wmb();
 204
 205         ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) |
 206                 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);
 207
 208         stamp_send_wqe(qp, n + qp->sq_spare_wqes, size);
 209 }
 210
 211 /* Post NOP WQE to prevent wrap-around in the middle of WR */
 212 static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind)
 213 {
 214         unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1));
 215         if (unlikely(s < qp->sq_max_wqes_per_wr)) {
 216                 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift);
 217                 ind += s;
 218         }
 219         return ind;
 220 }
 221
 222 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
 223 {
 224         struct ib_event event;
 225         struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;
 226
 227         if (type == MLX4_EVENT_TYPE_PATH_MIG)
 228                 to_mibqp(qp)->port = to_mibqp(qp)->alt_port;
 229
 230         if (ibqp->event_handler) {
 231                 event.device     = ibqp->device;
 232                 event.element.qp = ibqp;
 233                 switch (type) {
 234                 case MLX4_EVENT_TYPE_PATH_MIG:
 235                         event.event = IB_EVENT_PATH_MIG;
 236                         break;
 237                 case MLX4_EVENT_TYPE_COMM_EST:
 238                         event.event = IB_EVENT_COMM_EST;
 239                         break;
 240                 case MLX4_EVENT_TYPE_SQ_DRAINED:
 241                         event.event = IB_EVENT_SQ_DRAINED;
 242                         break;
 243                 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
 244                         event.event = IB_EVENT_QP_LAST_WQE_REACHED;
 245                         break;
 246                 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
 247                         event.event = IB_EVENT_QP_FATAL;
 248                         break;
 249                 case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
 250                         event.event = IB_EVENT_PATH_MIG_ERR;
 251                         break;
 252                 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
 253                         event.event = IB_EVENT_QP_REQ_ERR;
 254                         break;
 255                 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
 256                         event.event = IB_EVENT_QP_ACCESS_ERR;
 257                         break;
 258                 default:
 259                         printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
 260                                "on QP %06x\n", type, qp->qpn);
 261                         return;
 262                 }
 263
 264                 ibqp->event_handler(&event, ibqp->qp_context);
 265         }
 266 }
 267
 268 static int send_wqe_overhead(enum ib_qp_type type, u32 flags)
 269 {
 270         /*
 271          * UD WQEs must have a datagram segment.
 272          * RC and UC WQEs might have a remote address segment.
 273          * MLX WQEs need two extra inline data segments (for the UD
 274          * header and space for the ICRC).
 275          */
 276         switch (type) {
 277         case IB_QPT_UD:
 278                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 279                         sizeof (struct mlx4_wqe_datagram_seg) +
 280                         ((flags & MLX4_IB_QP_LSO) ? MLX4_IB_LSO_HEADER_SPARE : 0);
 281         case IB_QPT_UC:
 282                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 283                         sizeof (struct mlx4_wqe_raddr_seg);
 284         case IB_QPT_RC:
 285                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 286                         sizeof (struct mlx4_wqe_atomic_seg) +
 287                         sizeof (struct mlx4_wqe_raddr_seg);
 288         case IB_QPT_SMI:
 289         case IB_QPT_GSI:
 290                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 291                         ALIGN(MLX4_IB_UD_HEADER_SIZE +
 292                               DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE,
 293                                            MLX4_INLINE_ALIGN) *
 294                               sizeof (struct mlx4_wqe_inline_seg),
 295                               sizeof (struct mlx4_wqe_data_seg)) +
 296                         ALIGN(4 +
 297                               sizeof (struct mlx4_wqe_inline_seg),
 298                               sizeof (struct mlx4_wqe_data_seg));
 299         default:
 300                 return sizeof (struct mlx4_wqe_ctrl_seg);
 301         }
 302 }
 303
 304 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
 305                        int is_user, int has_srq, struct mlx4_ib_qp *qp)
 306 {
 307         /* Sanity check RQ size before proceeding */
 308         if (cap->max_recv_wr  > dev->dev->caps.max_wqes  ||
 309             cap->max_recv_sge > dev->dev->caps.max_rq_sg)
 310                 return -EINVAL;
 311
 312         if (has_srq) {
 313                 /* QPs attached to an SRQ should have no RQ */
 314                 if (cap->max_recv_wr)
 315                         return -EINVAL;
 316
 317                 qp->rq.wqe_cnt = qp->rq.max_gs = 0;
 318         } else {
 319                 /* HW requires >= 1 RQ entry with >= 1 gather entry */
 320                 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
 321                         return -EINVAL;
 322
 323                 qp->rq.wqe_cnt   = roundup_pow_of_two(max(1U, cap->max_recv_wr));
 324                 qp->rq.max_gs    = roundup_pow_of_two(max(1U, cap->max_recv_sge));
 325                 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
 326         }
 327
 328         cap->max_recv_wr  = qp->rq.max_post = qp->rq.wqe_cnt;
 329         cap->max_recv_sge = qp->rq.max_gs;
 330
 331         return 0;
 332 }
 333
 334 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
 335                               enum ib_qp_type type, struct mlx4_ib_qp *qp)
 336 {
 337         int s;
 338
 339         /* Sanity check SQ size before proceeding */
 340         if (cap->max_send_wr     > dev->dev->caps.max_wqes  ||
 341             cap->max_send_sge    > dev->dev->caps.max_sq_sg ||
 342             cap->max_inline_data + send_wqe_overhead(type, qp->flags) +
 343             sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
 344                 return -EINVAL;
 345
 346         /*
 347          * For MLX transport we need 2 extra S/G entries:
 348          * one for the header and one for the checksum at the end
 349          */
 350         if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
 351             cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
 352                 return -EINVAL;
 353
 354         s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg),
 355                 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) +
 356                 send_wqe_overhead(type, qp->flags);
 357
 358         if (s > dev->dev->caps.max_sq_desc_sz)
 359                 return -EINVAL;
 360
 361         /*
 362          * Hermon supports shrinking WQEs, such that a single work
 363          * request can include multiple units of 1 << wqe_shift.  This
 364          * way, work requests can differ in size, and do not have to
 365          * be a power of 2 in size, saving memory and speeding up send
 366          * WR posting.  Unfortunately, if we do this then the
 367          * wqe_index field in CQEs can't be used to look up the WR ID
 368          * anymore, so we do this only if selective signaling is off.
 369          *
 370          * Further, on 32-bit platforms, we can't use vmap() to make
 371          * the QP buffer virtually contiguous.  Thus we have to use
 372          * constant-sized WRs to make sure a WR is always fully within
 373          * a single page-sized chunk.
 374          *
 375          * Finally, we use NOP work requests to pad the end of the
 376          * work queue, to avoid wrap-around in the middle of WR.  We
 377          * set NEC bit to avoid getting completions with error for
 378          * these NOP WRs, but since NEC is only supported starting
 379          * with firmware 2.2.232, we use constant-sized WRs for older
 380          * firmware.
 381          *
 382          * And, since MLX QPs only support SEND, we use constant-sized
 383          * WRs in this case.
 384          *
 385          * We look for the smallest value of wqe_shift such that the
 386          * resulting number of wqes does not exceed device
 387          * capabilities.
 388          *
 389          * We set WQE size to at least 64 bytes, this way stamping
 390          * invalidates each WQE.
 391          */
 392         if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC &&
 393             qp->sq_signal_bits && BITS_PER_LONG == 64 &&
 394             type != IB_QPT_SMI && type != IB_QPT_GSI)
 395                 qp->sq.wqe_shift = ilog2(64);
 396         else
 397                 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s));
 398
 399         for (;;) {
 400                 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift);
 401
 402                 /*
 403                  * We need to leave 2 KB + 1 WR of headroom in the SQ to
 404                  * allow HW to prefetch.
 405                  */
 406                 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr;
 407                 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr *
 408                                                     qp->sq_max_wqes_per_wr +
 409                                                     qp->sq_spare_wqes);
 410
 411                 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes)
 412                         break;
 413
 414                 if (qp->sq_max_wqes_per_wr <= 1)
 415                         return -EINVAL;
 416
 417                 ++qp->sq.wqe_shift;
 418         }
 419
 420         qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz,
 421                              (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) -
 422                          send_wqe_overhead(type, qp->flags)) /
 423                 sizeof (struct mlx4_wqe_data_seg);
 424
 425         qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
 426                 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
 427         if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
 428                 qp->rq.offset = 0;
 429                 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
 430         } else {
 431                 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
 432                 qp->sq.offset = 0;
 433         }
 434
 435         cap->max_send_wr  = qp->sq.max_post =
 436                 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr;
 437         cap->max_send_sge = min(qp->sq.max_gs,
 438                                 min(dev->dev->caps.max_sq_sg,
 439                                     dev->dev->caps.max_rq_sg));
 440         /* We don't support inline sends for kernel QPs (yet) */
 441         cap->max_inline_data = 0;
 442
 443         return 0;
 444 }
 445
 446 static int set_user_sq_size(struct mlx4_ib_dev *dev,
 447                             struct mlx4_ib_qp *qp,
 448                             struct mlx4_ib_create_qp *ucmd)
 449 {
 450         /* Sanity check SQ size before proceeding */
 451         if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes       ||
 452             ucmd->log_sq_stride >
 453                 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) ||
 454             ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
 455                 return -EINVAL;
 456
 457         qp->sq.wqe_cnt   = 1 << ucmd->log_sq_bb_count;
 458         qp->sq.wqe_shift = ucmd->log_sq_stride;
 459
 460         qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
 461                 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
 462
 463         return 0;
 464 }
 465
 466 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
 467                             struct ib_qp_init_attr *init_attr,
 468                             struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
 469 {
 470         int qpn;
 471         int err;
 472
 473         mutex_init(&qp->mutex);
 474         spin_lock_init(&qp->sq.lock);
 475         spin_lock_init(&qp->rq.lock);
 476         INIT_LIST_HEAD(&qp->gid_list);
 477
 478         qp->state        = IB_QPS_RESET;
 479         if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
 480                 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
 481
 482         err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp);
 483         if (err)
 484                 goto err;
 485
 486         if (pd->uobject) {
 487                 struct mlx4_ib_create_qp ucmd;
 488
 489                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 490                         err = -EFAULT;
 491                         goto err;
 492                 }
 493
 494                 qp->sq_no_prefetch = ucmd.sq_no_prefetch;
 495
 496                 err = set_user_sq_size(dev, qp, &ucmd);
 497                 if (err)
 498                         goto err;
 499
 500                 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 501                                        qp->buf_size, 0, 0);
 502                 if (IS_ERR(qp->umem)) {
 503                         err = PTR_ERR(qp->umem);
 504                         goto err;
 505                 }
 506
 507                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
 508                                     ilog2(qp->umem->page_size), &qp->mtt);
 509                 if (err)
 510                         goto err_buf;
 511
 512                 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
 513                 if (err)
 514                         goto err_mtt;
 515
 516                 if (!init_attr->srq) {
 517                         err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 518                                                   ucmd.db_addr, &qp->db);
 519                         if (err)
 520                                 goto err_mtt;
 521                 }
 522         } else {
 523                 qp->sq_no_prefetch = 0;
 524
 525                 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)
 526                         qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK;
 527
 528                 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO)
 529                         qp->flags |= MLX4_IB_QP_LSO;
 530
 531                 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
 532                 if (err)
 533                         goto err;
 534
 535                 if (!init_attr->srq) {
 536                         err = mlx4_db_alloc(dev->dev, &qp->db, 0);
 537                         if (err)
 538                                 goto err;
 539
 540                         *qp->db.db = 0;
 541                 }
 542
 543                 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
 544                         err = -ENOMEM;
 545                         goto err_db;
 546                 }
 547
 548                 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
 549                                     &qp->mtt);
 550                 if (err)
 551                         goto err_buf;
 552
 553                 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
 554                 if (err)
 555                         goto err_mtt;
 556
 557                 qp->sq.wrid  = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
 558                 qp->rq.wrid  = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
 559
 560                 if (!qp->sq.wrid || !qp->rq.wrid) {
 561                         err = -ENOMEM;
 562                         goto err_wrid;
 563                 }
 564         }
 565
 566         if (sqpn) {
 567                 qpn = sqpn;
 568         } else {
 569                 err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn);
 570                 if (err)
 571                         goto err_wrid;
 572         }
 573
 574         err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp);
 575         if (err)
 576                 goto err_qpn;
 577
 578         /*
 579          * Hardware wants QPN written in big-endian order (after
 580          * shifting) for send doorbell.  Precompute this value to save
 581          * a little bit when posting sends.
 582          */
 583         qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
 584
 585         qp->mqp.event = mlx4_ib_qp_event;
 586
 587         return 0;
 588
 589 err_qpn:
 590         if (!sqpn)
 591                 mlx4_qp_release_range(dev->dev, qpn, 1);
 592
 593 err_wrid:
 594         if (pd->uobject) {
 595                 if (!init_attr->srq)
 596                         mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context),
 597                                               &qp->db);
 598         } else {
 599                 kfree(qp->sq.wrid);
 600                 kfree(qp->rq.wrid);
 601         }
 602
 603 err_mtt:
 604         mlx4_mtt_cleanup(dev->dev, &qp->mtt);
 605
 606 err_buf:
 607         if (pd->uobject)
 608                 ib_umem_release(qp->umem);
 609         else
 610                 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
 611
 612 err_db:
 613         if (!pd->uobject && !init_attr->srq)
 614                 mlx4_db_free(dev->dev, &qp->db);
 615
 616 err:
 617         return err;
 618 }
 619
 620 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
 621 {
 622         switch (state) {
 623         case IB_QPS_RESET:      return MLX4_QP_STATE_RST;
 624         case IB_QPS_INIT:       return MLX4_QP_STATE_INIT;
 625         case IB_QPS_RTR:        return MLX4_QP_STATE_RTR;
 626         case IB_QPS_RTS:        return MLX4_QP_STATE_RTS;
 627         case IB_QPS_SQD:        return MLX4_QP_STATE_SQD;
 628         case IB_QPS_SQE:        return MLX4_QP_STATE_SQER;
 629         case IB_QPS_ERR:        return MLX4_QP_STATE_ERR;
 630         default:                return -1;
 631         }
 632 }
 633
 634 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
 635         __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
 636 {
 637         if (send_cq == recv_cq) {
 638                 spin_lock_irq(&send_cq->lock);
 639                 __acquire(&recv_cq->lock);
 640         } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
 641                 spin_lock_irq(&send_cq->lock);
 642                 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
 643         } else {
 644                 spin_lock_irq(&recv_cq->lock);
 645                 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
 646         }
 647 }
 648
 649 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
 650         __releases(&send_cq->lock) __releases(&recv_cq->lock)
 651 {
 652         if (send_cq == recv_cq) {
 653                 __release(&recv_cq->lock);
 654                 spin_unlock_irq(&send_cq->lock);
 655         } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
 656                 spin_unlock(&recv_cq->lock);
 657                 spin_unlock_irq(&send_cq->lock);
 658         } else {
 659                 spin_unlock(&send_cq->lock);
 660                 spin_unlock_irq(&recv_cq->lock);
 661         }
 662 }
 663
 664 static void del_gid_entries(struct mlx4_ib_qp *qp)
 665 {
 666         struct mlx4_ib_gid_entry *ge, *tmp;
 667
 668         list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
 669                 list_del(&ge->list);
 670                 kfree(ge);
 671         }
 672 }
 673
 674 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
 675                               int is_user)
 676 {
 677         struct mlx4_ib_cq *send_cq, *recv_cq;
 678
 679         if (qp->state != IB_QPS_RESET)
 680                 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
 681                                    MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
 682                         printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
 683                                qp->mqp.qpn);
 684
 685         send_cq = to_mcq(qp->ibqp.send_cq);
 686         recv_cq = to_mcq(qp->ibqp.recv_cq);
 687
 688         mlx4_ib_lock_cqs(send_cq, recv_cq);
 689
 690         if (!is_user) {
 691                 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
 692                                  qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
 693                 if (send_cq != recv_cq)
 694                         __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
 695         }
 696
 697         mlx4_qp_remove(dev->dev, &qp->mqp);
 698
 699         mlx4_ib_unlock_cqs(send_cq, recv_cq);
 700
 701         mlx4_qp_free(dev->dev, &qp->mqp);
 702
 703         if (!is_sqp(dev, qp))
 704                 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1);
 705
 706         mlx4_mtt_cleanup(dev->dev, &qp->mtt);
 707
 708         if (is_user) {
 709                 if (!qp->ibqp.srq)
 710                         mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
 711                                               &qp->db);
 712                 ib_umem_release(qp->umem);
 713         } else {
 714                 kfree(qp->sq.wrid);
 715                 kfree(qp->rq.wrid);
 716                 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
 717                 if (!qp->ibqp.srq)
 718                         mlx4_db_free(dev->dev, &qp->db);
 719         }
 720
 721         del_gid_entries(qp);
 722 }
 723
 724 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
 725                                 struct ib_qp_init_attr *init_attr,
 726                                 struct ib_udata *udata)
 727 {
 728         struct mlx4_ib_dev *dev = to_mdev(pd->device);
 729         struct mlx4_ib_sqp *sqp;
 730         struct mlx4_ib_qp *qp;
 731         int err;
 732
 733         /*
 734          * We only support LSO and multicast loopback blocking, and
 735          * only for kernel UD QPs.
 736          */
 737         if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO |
 738                                         IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK))
 739                 return ERR_PTR(-EINVAL);
 740
 741         if (init_attr->create_flags &&
 742             (pd->uobject || init_attr->qp_type != IB_QPT_UD))
 743                 return ERR_PTR(-EINVAL);
 744
 745         switch (init_attr->qp_type) {
 746         case IB_QPT_RC:
 747         case IB_QPT_UC:
 748         case IB_QPT_UD:
 749         {
 750                 qp = kzalloc(sizeof *qp, GFP_KERNEL);
 751                 if (!qp)
 752                         return ERR_PTR(-ENOMEM);
 753
 754                 err = create_qp_common(dev, pd, init_attr, udata, 0, qp);
 755                 if (err) {
 756                         kfree(qp);
 757                         return ERR_PTR(err);
 758                 }
 759
 760                 qp->ibqp.qp_num = qp->mqp.qpn;
 761
 762                 break;
 763         }
 764         case IB_QPT_SMI:
 765         case IB_QPT_GSI:
 766         {
 767                 /* Userspace is not allowed to create special QPs: */
 768                 if (pd->uobject)
 769                         return ERR_PTR(-EINVAL);
 770
 771                 sqp = kzalloc(sizeof *sqp, GFP_KERNEL);
 772                 if (!sqp)
 773                         return ERR_PTR(-ENOMEM);
 774
 775                 qp = &sqp->qp;
 776
 777                 err = create_qp_common(dev, pd, init_attr, udata,
 778                                        dev->dev->caps.sqp_start +
 779                                        (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
 780                                        init_attr->port_num - 1,
 781                                        qp);
 782                 if (err) {
 783                         kfree(sqp);
 784                         return ERR_PTR(err);
 785                 }
 786
 787                 qp->port        = init_attr->port_num;
 788                 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
 789
 790                 break;
 791         }
 792         default:
 793                 /* Don't support raw QPs */
 794                 return ERR_PTR(-EINVAL);
 795         }
 796
 797         return &qp->ibqp;
 798 }
 799
 800 int mlx4_ib_destroy_qp(struct ib_qp *qp)
 801 {
 802         struct mlx4_ib_dev *dev = to_mdev(qp->device);
 803         struct mlx4_ib_qp *mqp = to_mqp(qp);
 804
 805         if (is_qp0(dev, mqp))
 806                 mlx4_CLOSE_PORT(dev->dev, mqp->port);
 807
 808         destroy_qp_common(dev, mqp, !!qp->pd->uobject);
 809
 810         if (is_sqp(dev, mqp))
 811                 kfree(to_msqp(mqp));
 812         else
 813                 kfree(mqp);
 814
 815         return 0;
 816 }
 817
 818 static int to_mlx4_st(enum ib_qp_type type)
 819 {
 820         switch (type) {
 821         case IB_QPT_RC:         return MLX4_QP_ST_RC;
 822         case IB_QPT_UC:         return MLX4_QP_ST_UC;
 823         case IB_QPT_UD:         return MLX4_QP_ST_UD;
 824         case IB_QPT_SMI:
 825         case IB_QPT_GSI:        return MLX4_QP_ST_MLX;
 826         default:                return -1;
 827         }
 828 }
 829
 830 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
 831                                    int attr_mask)
 832 {
 833         u8 dest_rd_atomic;
 834         u32 access_flags;
 835         u32 hw_access_flags = 0;
 836
 837         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
 838                 dest_rd_atomic = attr->max_dest_rd_atomic;
 839         else
 840                 dest_rd_atomic = qp->resp_depth;
 841
 842         if (attr_mask & IB_QP_ACCESS_FLAGS)
 843                 access_flags = attr->qp_access_flags;
 844         else
 845                 access_flags = qp->atomic_rd_en;
 846
 847         if (!dest_rd_atomic)
 848                 access_flags &= IB_ACCESS_REMOTE_WRITE;
 849
 850         if (access_flags & IB_ACCESS_REMOTE_READ)
 851                 hw_access_flags |= MLX4_QP_BIT_RRE;
 852         if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
 853                 hw_access_flags |= MLX4_QP_BIT_RAE;
 854         if (access_flags & IB_ACCESS_REMOTE_WRITE)
 855                 hw_access_flags |= MLX4_QP_BIT_RWE;
 856
 857         return cpu_to_be32(hw_access_flags);
 858 }
 859
 860 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
 861                             int attr_mask)
 862 {
 863         if (attr_mask & IB_QP_PKEY_INDEX)
 864                 sqp->pkey_index = attr->pkey_index;
 865         if (attr_mask & IB_QP_QKEY)
 866                 sqp->qkey = attr->qkey;
 867         if (attr_mask & IB_QP_SQ_PSN)
 868                 sqp->send_psn = attr->sq_psn;
 869 }
 870
 871 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
 872 {
 873         path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
 874 }
 875
 876 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
 877                          struct mlx4_qp_path *path, u8 port)
 878 {
 879         int err;
 880         int is_eth = rdma_port_get_link_layer(&dev->ib_dev, port) ==
 881                 IB_LINK_LAYER_ETHERNET;
 882         u8 mac[6];
 883         int is_mcast;
 884         u16 vlan_tag;
 885         int vidx;
 886
 887         path->grh_mylmc     = ah->src_path_bits & 0x7f;
 888         path->rlid          = cpu_to_be16(ah->dlid);
 889         if (ah->static_rate) {
 890                 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
 891                 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
 892                        !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
 893                         --path->static_rate;
 894         } else
 895                 path->static_rate = 0;
 896
 897         if (ah->ah_flags & IB_AH_GRH) {
 898                 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
 899                         printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
 900                                ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
 901                         return -1;
 902                 }
 903
 904                 path->grh_mylmc |= 1 << 7;
 905                 path->mgid_index = ah->grh.sgid_index;
 906                 path->hop_limit  = ah->grh.hop_limit;
 907                 path->tclass_flowlabel =
 908                         cpu_to_be32((ah->grh.traffic_class << 20) |
 909                                     (ah->grh.flow_label));
 910                 memcpy(path->rgid, ah->grh.dgid.raw, 16);
 911         }
 912
 913         if (is_eth) {
 914                 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
 915                         ((port - 1) << 6) | ((ah->sl & 7) << 3) | ((ah->sl & 8) >> 1);
 916
 917                 if (!(ah->ah_flags & IB_AH_GRH))
 918                         return -1;
 919
 920                 err = mlx4_ib_resolve_grh(dev, ah, mac, &is_mcast, port);
 921                 if (err)
 922                         return err;
 923
 924                 memcpy(path->dmac, mac, 6);
 925                 path->ackto = MLX4_IB_LINK_TYPE_ETH;
 926                 /* use index 0 into MAC table for IBoE */
 927                 path->grh_mylmc &= 0x80;
 928
 929                 vlan_tag = rdma_get_vlan_id(&dev->iboe.gid_table[port - 1][ah->grh.sgid_index]);
 930                 if (vlan_tag < 0x1000) {
 931                         if (mlx4_find_cached_vlan(dev->dev, port, vlan_tag, &vidx))
 932                                 return -ENOENT;
 933
 934                         path->vlan_index = vidx;
 935                         path->fl = 1 << 6;
 936                 }
 937         } else
 938                 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
 939                         ((port - 1) << 6) | ((ah->sl & 0xf) << 2);
 940
 941         return 0;
 942 }
 943
 944 static void update_mcg_macs(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
 945 {
 946         struct mlx4_ib_gid_entry *ge, *tmp;
 947
 948         list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
 949                 if (!ge->added && mlx4_ib_add_mc(dev, qp, &ge->gid)) {
 950                         ge->added = 1;
 951                         ge->port = qp->port;
 952                 }
 953         }
 954 }
 955
 956 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
 957                                const struct ib_qp_attr *attr, int attr_mask,
 958                                enum ib_qp_state cur_state, enum ib_qp_state new_state)
 959 {
 960         struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
 961         struct mlx4_ib_qp *qp = to_mqp(ibqp);
 962         struct mlx4_qp_context *context;
 963         enum mlx4_qp_optpar optpar = 0;
 964         int sqd_event;
 965         int err = -EINVAL;
 966
 967         context = kzalloc(sizeof *context, GFP_KERNEL);
 968         if (!context)
 969                 return -ENOMEM;
 970
 971         context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
 972                                      (to_mlx4_st(ibqp->qp_type) << 16));
 973
 974         if (!(attr_mask & IB_QP_PATH_MIG_STATE))
 975                 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
 976         else {
 977                 optpar |= MLX4_QP_OPTPAR_PM_STATE;
 978                 switch (attr->path_mig_state) {
 979                 case IB_MIG_MIGRATED:
 980                         context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
 981                         break;
 982                 case IB_MIG_REARM:
 983                         context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
 984                         break;
 985                 case IB_MIG_ARMED:
 986                         context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
 987                         break;
 988                 }
 989         }
 990
 991         if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI)
 992                 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
 993         else if (ibqp->qp_type == IB_QPT_UD) {
 994                 if (qp->flags & MLX4_IB_QP_LSO)
 995                         context->mtu_msgmax = (IB_MTU_4096 << 5) |
 996                                               ilog2(dev->dev->caps.max_gso_sz);
 997                 else
 998                         context->mtu_msgmax = (IB_MTU_4096 << 5) | 12;
 999         } else if (attr_mask & IB_QP_PATH_MTU) {
1000                 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
1001                         printk(KERN_ERR "path MTU (%u) is invalid\n",
1002                                attr->path_mtu);
1003                         goto out;
1004                 }
1005                 context->mtu_msgmax = (attr->path_mtu << 5) |
1006                         ilog2(dev->dev->caps.max_msg_sz);
1007         }
1008
1009         if (qp->rq.wqe_cnt)
1010                 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
1011         context->rq_size_stride |= qp->rq.wqe_shift - 4;
1012
1013         if (qp->sq.wqe_cnt)
1014                 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
1015         context->sq_size_stride |= qp->sq.wqe_shift - 4;
1016
1017         if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1018                 context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
1019
1020         if (qp->ibqp.uobject)
1021                 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
1022         else
1023                 context->usr_page = cpu_to_be32(dev->priv_uar.index);
1024
1025         if (attr_mask & IB_QP_DEST_QPN)
1026                 context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
1027
1028         if (attr_mask & IB_QP_PORT) {
1029                 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
1030                     !(attr_mask & IB_QP_AV)) {
1031                         mlx4_set_sched(&context->pri_path, attr->port_num);
1032                         optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
1033                 }
1034         }
1035
1036         if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) {
1037                 if (dev->counters[qp->port - 1] != -1) {
1038                         context->pri_path.counter_index =
1039                                                 dev->counters[qp->port - 1];
1040                         optpar |= MLX4_QP_OPTPAR_COUNTER_INDEX;
1041                 } else
1042                         context->pri_path.counter_index = 0xff;
1043         }
1044
1045         if (attr_mask & IB_QP_PKEY_INDEX) {
1046                 context->pri_path.pkey_index = attr->pkey_index;
1047                 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
1048         }
1049
1050         if (attr_mask & IB_QP_AV) {
1051                 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
1052                                   attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
1053                         goto out;
1054
1055                 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
1056                            MLX4_QP_OPTPAR_SCHED_QUEUE);
1057         }
1058
1059         if (attr_mask & IB_QP_TIMEOUT) {
1060                 context->pri_path.ackto |= attr->timeout << 3;
1061                 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
1062         }
1063
1064         if (attr_mask & IB_QP_ALT_PATH) {
1065                 if (attr->alt_port_num == 0 ||
1066                     attr->alt_port_num > dev->dev->caps.num_ports)
1067                         goto out;
1068
1069                 if (attr->alt_pkey_index >=
1070                     dev->dev->caps.pkey_table_len[attr->alt_port_num])
1071                         goto out;
1072
1073                 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
1074                                   attr->alt_port_num))
1075                         goto out;
1076
1077                 context->alt_path.pkey_index = attr->alt_pkey_index;
1078                 context->alt_path.ackto = attr->alt_timeout << 3;
1079                 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
1080         }
1081
1082         context->pd         = cpu_to_be32(to_mpd(ibqp->pd)->pdn);
1083         context->params1    = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
1084
1085         /* Set "fast registration enabled" for all kernel QPs */
1086         if (!qp->ibqp.uobject)
1087                 context->params1 |= cpu_to_be32(1 << 11);
1088
1089         if (attr_mask & IB_QP_RNR_RETRY) {
1090                 context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
1091                 optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
1092         }
1093
1094         if (attr_mask & IB_QP_RETRY_CNT) {
1095                 context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
1096                 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
1097         }
1098
1099         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
1100                 if (attr->max_rd_atomic)
1101                         context->params1 |=
1102                                 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
1103                 optpar |= MLX4_QP_OPTPAR_SRA_MAX;
1104         }
1105
1106         if (attr_mask & IB_QP_SQ_PSN)
1107                 context->next_send_psn = cpu_to_be32(attr->sq_psn);
1108
1109         context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn);
1110
1111         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
1112                 if (attr->max_dest_rd_atomic)
1113                         context->params2 |=
1114                                 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
1115                 optpar |= MLX4_QP_OPTPAR_RRA_MAX;
1116         }
1117
1118         if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
1119                 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
1120                 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
1121         }
1122
1123         if (ibqp->srq)
1124                 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
1125
1126         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
1127                 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
1128                 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
1129         }
1130         if (attr_mask & IB_QP_RQ_PSN)
1131                 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
1132
1133         context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn);
1134
1135         if (attr_mask & IB_QP_QKEY) {
1136                 context->qkey = cpu_to_be32(attr->qkey);
1137                 optpar |= MLX4_QP_OPTPAR_Q_KEY;
1138         }
1139
1140         if (ibqp->srq)
1141                 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
1142
1143         if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1144                 context->db_rec_addr = cpu_to_be64(qp->db.dma);
1145
1146         if (cur_state == IB_QPS_INIT &&
1147             new_state == IB_QPS_RTR  &&
1148             (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
1149              ibqp->qp_type == IB_QPT_UD)) {
1150                 context->pri_path.sched_queue = (qp->port - 1) << 6;
1151                 if (is_qp0(dev, qp))
1152                         context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
1153                 else
1154                         context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
1155         }
1156
1157         if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD  &&
1158             attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
1159                 sqd_event = 1;
1160         else
1161                 sqd_event = 0;
1162
1163         if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1164                 context->rlkey |= (1 << 4);
1165
1166         /*
1167          * Before passing a kernel QP to the HW, make sure that the
1168          * ownership bits of the send queue are set and the SQ
1169          * headroom is stamped so that the hardware doesn't start
1170          * processing stale work requests.
1171          */
1172         if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1173                 struct mlx4_wqe_ctrl_seg *ctrl;
1174                 int i;
1175
1176                 for (i = 0; i < qp->sq.wqe_cnt; ++i) {
1177                         ctrl = get_send_wqe(qp, i);
1178                         ctrl->owner_opcode = cpu_to_be32(1 << 31);
1179                         if (qp->sq_max_wqes_per_wr == 1)
1180                                 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4);
1181
1182                         stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift);
1183                 }
1184         }
1185
1186         err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
1187                              to_mlx4_state(new_state), context, optpar,
1188                              sqd_event, &qp->mqp);
1189         if (err)
1190                 goto out;
1191
1192         qp->state = new_state;
1193
1194         if (attr_mask & IB_QP_ACCESS_FLAGS)
1195                 qp->atomic_rd_en = attr->qp_access_flags;
1196         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
1197                 qp->resp_depth = attr->max_dest_rd_atomic;
1198         if (attr_mask & IB_QP_PORT) {
1199                 qp->port = attr->port_num;
1200                 update_mcg_macs(dev, qp);
1201         }
1202         if (attr_mask & IB_QP_ALT_PATH)
1203                 qp->alt_port = attr->alt_port_num;
1204
1205         if (is_sqp(dev, qp))
1206                 store_sqp_attrs(to_msqp(qp), attr, attr_mask);
1207
1208         /*
1209          * If we moved QP0 to RTR, bring the IB link up; if we moved
1210          * QP0 to RESET or ERROR, bring the link back down.
1211          */
1212         if (is_qp0(dev, qp)) {
1213                 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
1214                         if (mlx4_INIT_PORT(dev->dev, qp->port))
1215                                 printk(KERN_WARNING "INIT_PORT failed for port %d\n",
1216                                        qp->port);
1217
1218                 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
1219                     (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
1220                         mlx4_CLOSE_PORT(dev->dev, qp->port);
1221         }
1222
1223         /*
1224          * If we moved a kernel QP to RESET, clean up all old CQ
1225          * entries and reinitialize the QP.
1226          */
1227         if (new_state == IB_QPS_RESET && !ibqp->uobject) {
1228                 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn,
1229                                  ibqp->srq ? to_msrq(ibqp->srq): NULL);
1230                 if (ibqp->send_cq != ibqp->recv_cq)
1231                         mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL);
1232
1233                 qp->rq.head = 0;
1234                 qp->rq.tail = 0;
1235                 qp->sq.head = 0;
1236                 qp->sq.tail = 0;
1237                 qp->sq_next_wqe = 0;
1238                 if (!ibqp->srq)
1239                         *qp->db.db  = 0;
1240         }
1241
1242 out:
1243         kfree(context);
1244         return err;
1245 }
1246
1247 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
1248                       int attr_mask, struct ib_udata *udata)
1249 {
1250         struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1251         struct mlx4_ib_qp *qp = to_mqp(ibqp);
1252         enum ib_qp_state cur_state, new_state;
1253         int err = -EINVAL;
1254
1255         mutex_lock(&qp->mutex);
1256
1257         cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
1258         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
1259
1260         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
1261                 goto out;
1262
1263         if ((attr_mask & IB_QP_PORT) &&
1264             (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
1265                 goto out;
1266         }
1267
1268         if (attr_mask & IB_QP_PKEY_INDEX) {
1269                 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
1270                 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p])
1271                         goto out;
1272         }
1273
1274         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
1275             attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
1276                 goto out;
1277         }
1278
1279         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
1280             attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
1281                 goto out;
1282         }
1283
1284         if (cur_state == new_state && cur_state == IB_QPS_RESET) {
1285                 err = 0;
1286                 goto out;
1287         }
1288
1289         err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
1290
1291 out:
1292         mutex_unlock(&qp->mutex);
1293         return err;
1294 }
1295
1296 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
1297                             void *wqe, unsigned *mlx_seg_len)
1298 {
1299         struct ib_device *ib_dev = sqp->qp.ibqp.device;
1300         struct mlx4_wqe_mlx_seg *mlx = wqe;
1301         struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1302         struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1303         union ib_gid sgid;
1304         u16 pkey;
1305         int send_size;
1306         int header_size;
1307         int spc;
1308         int i;
1309         int is_eth;
1310         int is_vlan = 0;
1311         int is_grh;
1312         u16 vlan;
1313
1314         send_size = 0;
1315         for (i = 0; i < wr->num_sge; ++i)
1316                 send_size += wr->sg_list[i].length;
1317
1318         is_eth = rdma_port_get_link_layer(sqp->qp.ibqp.device, sqp->qp.port) == IB_LINK_LAYER_ETHERNET;
1319         is_grh = mlx4_ib_ah_grh_present(ah);
1320         if (is_eth) {
1321                 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24,
1322                                   ah->av.ib.gid_index, &sgid);
1323                 vlan = rdma_get_vlan_id(&sgid);
1324                 is_vlan = vlan < 0x1000;
1325         }
1326         ib_ud_header_init(send_size, !is_eth, is_eth, is_vlan, is_grh, 0, &sqp->ud_header);
1327
1328         if (!is_eth) {
1329                 sqp->ud_header.lrh.service_level =
1330                         be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
1331                 sqp->ud_header.lrh.destination_lid = ah->av.ib.dlid;
1332                 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.ib.g_slid & 0x7f);
1333         }
1334
1335         if (is_grh) {
1336                 sqp->ud_header.grh.traffic_class =
1337                         (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20) & 0xff;
1338                 sqp->ud_header.grh.flow_label    =
1339                         ah->av.ib.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
1340                 sqp->ud_header.grh.hop_limit     = ah->av.ib.hop_limit;
1341                 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24,
1342                                   ah->av.ib.gid_index, &sqp->ud_header.grh.source_gid);
1343                 memcpy(sqp->ud_header.grh.destination_gid.raw,
1344                        ah->av.ib.dgid, 16);
1345         }
1346
1347         mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1348
1349         if (!is_eth) {
1350                 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
1351                                           (sqp->ud_header.lrh.destination_lid ==
1352                                            IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
1353                                           (sqp->ud_header.lrh.service_level << 8));
1354                 mlx->rlid = sqp->ud_header.lrh.destination_lid;
1355         }
1356
1357         switch (wr->opcode) {
1358         case IB_WR_SEND:
1359                 sqp->ud_header.bth.opcode        = IB_OPCODE_UD_SEND_ONLY;
1360                 sqp->ud_header.immediate_present = 0;
1361                 break;
1362         case IB_WR_SEND_WITH_IMM:
1363                 sqp->ud_header.bth.opcode        = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1364                 sqp->ud_header.immediate_present = 1;
1365                 sqp->ud_header.immediate_data    = wr->ex.imm_data;
1366                 break;
1367         default:
1368                 return -EINVAL;
1369         }
1370
1371         if (is_eth) {
1372                 u8 *smac;
1373
1374                 memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6);
1375                 /* FIXME: cache smac value? */
1376                 smac = to_mdev(sqp->qp.ibqp.device)->iboe.netdevs[sqp->qp.port - 1]->dev_addr;
1377                 memcpy(sqp->ud_header.eth.smac_h, smac, 6);
1378                 if (!memcmp(sqp->ud_header.eth.smac_h, sqp->ud_header.eth.dmac_h, 6))
1379                         mlx->flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);
1380                 if (!is_vlan) {
1381                         sqp->ud_header.eth.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1382                 } else {
1383                         u16 pcp;
1384
1385                         sqp->ud_header.vlan.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1386                         pcp = (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 27 & 3) << 13;
1387                         sqp->ud_header.vlan.tag = cpu_to_be16(vlan | pcp);
1388                 }
1389         } else {
1390                 sqp->ud_header.lrh.virtual_lane    = !sqp->qp.ibqp.qp_num ? 15 : 0;
1391                 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1392                         sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1393         }
1394         sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1395         if (!sqp->qp.ibqp.qp_num)
1396                 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
1397         else
1398                 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
1399         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1400         sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1401         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1402         sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1403                                                sqp->qkey : wr->wr.ud.remote_qkey);
1404         sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1405
1406         header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1407
1408         if (0) {
1409                 printk(KERN_ERR "built UD header of size %d:\n", header_size);
1410                 for (i = 0; i < header_size / 4; ++i) {
1411                         if (i % 8 == 0)
1412                                 printk("  [%02x] ", i * 4);
1413                         printk(" %08x",
1414                                be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
1415                         if ((i + 1) % 8 == 0)
1416                                 printk("\n");
1417                 }
1418                 printk("\n");
1419         }
1420
1421         /*
1422          * Inline data segments may not cross a 64 byte boundary.  If
1423          * our UD header is bigger than the space available up to the
1424          * next 64 byte boundary in the WQE, use two inline data
1425          * segments to hold the UD header.
1426          */
1427         spc = MLX4_INLINE_ALIGN -
1428                 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1429         if (header_size <= spc) {
1430                 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1431                 memcpy(inl + 1, sqp->header_buf, header_size);
1432                 i = 1;
1433         } else {
1434                 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1435                 memcpy(inl + 1, sqp->header_buf, spc);
1436
1437                 inl = (void *) (inl + 1) + spc;
1438                 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1439                 /*
1440                  * Need a barrier here to make sure all the data is
1441                  * visible before the byte_count field is set.
1442                  * Otherwise the HCA prefetcher could grab the 64-byte
1443                  * chunk with this inline segment and get a valid (!=
1444                  * 0xffffffff) byte count but stale data, and end up
1445                  * generating a packet with bad headers.
1446                  *
1447                  * The first inline segment's byte_count field doesn't
1448                  * need a barrier, because it comes after a
1449                  * control/MLX segment and therefore is at an offset
1450                  * of 16 mod 64.
1451                  */
1452                 wmb();
1453                 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1454                 i = 2;
1455         }
1456
1457         *mlx_seg_len =
1458                 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1459         return 0;
1460 }
1461
1462 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
1463 {
1464         unsigned cur;
1465         struct mlx4_ib_cq *cq;
1466
1467         cur = wq->head - wq->tail;
1468         if (likely(cur + nreq < wq->max_post))
1469                 return 0;
1470
1471         cq = to_mcq(ib_cq);
1472         spin_lock(&cq->lock);
1473         cur = wq->head - wq->tail;
1474         spin_unlock(&cq->lock);
1475
1476         return cur + nreq >= wq->max_post;
1477 }
1478
1479 static __be32 convert_access(int acc)
1480 {
1481         return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC)       : 0) |
1482                (acc & IB_ACCESS_REMOTE_WRITE  ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) |
1483                (acc & IB_ACCESS_REMOTE_READ   ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ)  : 0) |
1484                (acc & IB_ACCESS_LOCAL_WRITE   ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE)  : 0) |
1485                 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ);
1486 }
1487
1488 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr)
1489 {
1490         struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list);
1491         int i;
1492
1493         for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i)
1494                 mfrpl->mapped_page_list[i] =
1495                         cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] |
1496                                     MLX4_MTT_FLAG_PRESENT);
1497
1498         fseg->flags             = convert_access(wr->wr.fast_reg.access_flags);
1499         fseg->mem_key           = cpu_to_be32(wr->wr.fast_reg.rkey);
1500         fseg->buf_list          = cpu_to_be64(mfrpl->map);
1501         fseg->start_addr        = cpu_to_be64(wr->wr.fast_reg.iova_start);
1502         fseg->reg_len           = cpu_to_be64(wr->wr.fast_reg.length);
1503         fseg->offset            = 0; /* XXX -- is this just for ZBVA? */
1504         fseg->page_size         = cpu_to_be32(wr->wr.fast_reg.page_shift);
1505         fseg->reserved[0]       = 0;
1506         fseg->reserved[1]       = 0;
1507 }
1508
1509 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey)
1510 {
1511         iseg->flags     = 0;
1512         iseg->mem_key   = cpu_to_be32(rkey);
1513         iseg->guest_id  = 0;
1514         iseg->pa        = 0;
1515 }
1516
1517 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,
1518                                           u64 remote_addr, u32 rkey)
1519 {
1520         rseg->raddr    = cpu_to_be64(remote_addr);
1521         rseg->rkey     = cpu_to_be32(rkey);
1522         rseg->reserved = 0;
1523 }
1524
1525 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr)
1526 {
1527         if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1528                 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1529                 aseg->compare  = cpu_to_be64(wr->wr.atomic.compare_add);
1530         } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) {
1531                 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1532                 aseg->compare  = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1533         } else {
1534                 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1535                 aseg->compare  = 0;
1536         }
1537
1538 }
1539
1540 static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg,
1541                                   struct ib_send_wr *wr)
1542 {
1543         aseg->swap_add          = cpu_to_be64(wr->wr.atomic.swap);
1544         aseg->swap_add_mask     = cpu_to_be64(wr->wr.atomic.swap_mask);
1545         aseg->compare           = cpu_to_be64(wr->wr.atomic.compare_add);
1546         aseg->compare_mask      = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1547 }
1548
1549 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
1550                              struct ib_send_wr *wr)
1551 {
1552         memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
1553         dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1554         dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey);
1555         dseg->vlan = to_mah(wr->wr.ud.ah)->av.eth.vlan;
1556         memcpy(dseg->mac, to_mah(wr->wr.ud.ah)->av.eth.mac, 6);
1557 }
1558
1559 static void set_mlx_icrc_seg(void *dseg)
1560 {
1561         u32 *t = dseg;
1562         struct mlx4_wqe_inline_seg *iseg = dseg;
1563
1564         t[1] = 0;
1565
1566         /*
1567          * Need a barrier here before writing the byte_count field to
1568          * make sure that all the data is visible before the
1569          * byte_count field is set.  Otherwise, if the segment begins
1570          * a new cacheline, the HCA prefetcher could grab the 64-byte
1571          * chunk and get a valid (!= * 0xffffffff) byte count but
1572          * stale data, and end up sending the wrong data.
1573          */
1574         wmb();
1575
1576         iseg->byte_count = cpu_to_be32((1 << 31) | 4);
1577 }
1578
1579 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1580 {
1581         dseg->lkey       = cpu_to_be32(sg->lkey);
1582         dseg->addr       = cpu_to_be64(sg->addr);
1583
1584         /*
1585          * Need a barrier here before writing the byte_count field to
1586          * make sure that all the data is visible before the
1587          * byte_count field is set.  Otherwise, if the segment begins
1588          * a new cacheline, the HCA prefetcher could grab the 64-byte
1589          * chunk and get a valid (!= * 0xffffffff) byte count but
1590          * stale data, and end up sending the wrong data.
1591          */
1592         wmb();
1593
1594         dseg->byte_count = cpu_to_be32(sg->length);
1595 }
1596
1597 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1598 {
1599         dseg->byte_count = cpu_to_be32(sg->length);
1600         dseg->lkey       = cpu_to_be32(sg->lkey);
1601         dseg->addr       = cpu_to_be64(sg->addr);
1602 }
1603
1604 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr,
1605                          struct mlx4_ib_qp *qp, unsigned *lso_seg_len,
1606                          __be32 *lso_hdr_sz, __be32 *blh)
1607 {
1608         unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16);
1609
1610         if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE))
1611                 *blh = cpu_to_be32(1 << 6);
1612
1613         if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) &&
1614                      wr->num_sge > qp->sq.max_gs - (halign >> 4)))
1615                 return -EINVAL;
1616
1617         memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen);
1618
1619         *lso_hdr_sz  = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 |
1620                                    wr->wr.ud.hlen);
1621         *lso_seg_len = halign;
1622         return 0;
1623 }
1624
1625 static __be32 send_ieth(struct ib_send_wr *wr)
1626 {
1627         switch (wr->opcode) {
1628         case IB_WR_SEND_WITH_IMM:
1629         case IB_WR_RDMA_WRITE_WITH_IMM:
1630                 return wr->ex.imm_data;
1631
1632         case IB_WR_SEND_WITH_INV:
1633                 return cpu_to_be32(wr->ex.invalidate_rkey);
1634
1635         default:
1636                 return 0;
1637         }
1638 }
1639
1640 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1641                       struct ib_send_wr **bad_wr)
1642 {
1643         struct mlx4_ib_qp *qp = to_mqp(ibqp);
1644         void *wqe;
1645         struct mlx4_wqe_ctrl_seg *ctrl;
1646         struct mlx4_wqe_data_seg *dseg;
1647         unsigned long flags;
1648         int nreq;
1649         int err = 0;
1650         unsigned ind;
1651         int uninitialized_var(stamp);
1652         int uninitialized_var(size);
1653         unsigned uninitialized_var(seglen);
1654         __be32 dummy;
1655         __be32 *lso_wqe;
1656         __be32 uninitialized_var(lso_hdr_sz);
1657         __be32 blh;
1658         int i;
1659
1660         spin_lock_irqsave(&qp->sq.lock, flags);
1661
1662         ind = qp->sq_next_wqe;
1663
1664         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1665                 lso_wqe = &dummy;
1666                 blh = 0;
1667
1668                 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1669                         err = -ENOMEM;
1670                         *bad_wr = wr;
1671                         goto out;
1672                 }
1673
1674                 if (unlikely(wr->num_sge > qp->sq.max_gs)) {
1675                         err = -EINVAL;
1676                         *bad_wr = wr;
1677                         goto out;
1678                 }
1679
1680                 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
1681                 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
1682
1683                 ctrl->srcrb_flags =
1684                         (wr->send_flags & IB_SEND_SIGNALED ?
1685                          cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
1686                         (wr->send_flags & IB_SEND_SOLICITED ?
1687                          cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
1688                         ((wr->send_flags & IB_SEND_IP_CSUM) ?
1689                          cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
1690                                      MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) |
1691                         qp->sq_signal_bits;
1692
1693                 ctrl->imm = send_ieth(wr);
1694
1695                 wqe += sizeof *ctrl;
1696                 size = sizeof *ctrl / 16;
1697
1698                 switch (ibqp->qp_type) {
1699                 case IB_QPT_RC:
1700                 case IB_QPT_UC:
1701                         switch (wr->opcode) {
1702                         case IB_WR_ATOMIC_CMP_AND_SWP:
1703                         case IB_WR_ATOMIC_FETCH_AND_ADD:
1704                         case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD:
1705                                 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1706                                               wr->wr.atomic.rkey);
1707                                 wqe  += sizeof (struct mlx4_wqe_raddr_seg);
1708
1709                                 set_atomic_seg(wqe, wr);
1710                                 wqe  += sizeof (struct mlx4_wqe_atomic_seg);
1711
1712                                 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1713                                          sizeof (struct mlx4_wqe_atomic_seg)) / 16;
1714
1715                                 break;
1716
1717                         case IB_WR_MASKED_ATOMIC_CMP_AND_SWP:
1718                                 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1719                                               wr->wr.atomic.rkey);
1720                                 wqe  += sizeof (struct mlx4_wqe_raddr_seg);
1721
1722                                 set_masked_atomic_seg(wqe, wr);
1723                                 wqe  += sizeof (struct mlx4_wqe_masked_atomic_seg);
1724
1725                                 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1726                                          sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16;
1727
1728                                 break;
1729
1730                         case IB_WR_RDMA_READ:
1731                         case IB_WR_RDMA_WRITE:
1732                         case IB_WR_RDMA_WRITE_WITH_IMM:
1733                                 set_raddr_seg(wqe, wr->wr.rdma.remote_addr,
1734                                               wr->wr.rdma.rkey);
1735                                 wqe  += sizeof (struct mlx4_wqe_raddr_seg);
1736                                 size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
1737                                 break;
1738
1739                         case IB_WR_LOCAL_INV:
1740                                 ctrl->srcrb_flags |=
1741                                         cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1742                                 set_local_inv_seg(wqe, wr->ex.invalidate_rkey);
1743                                 wqe  += sizeof (struct mlx4_wqe_local_inval_seg);
1744                                 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16;
1745                                 break;
1746
1747                         case IB_WR_FAST_REG_MR:
1748                                 ctrl->srcrb_flags |=
1749                                         cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1750                                 set_fmr_seg(wqe, wr);
1751                                 wqe  += sizeof (struct mlx4_wqe_fmr_seg);
1752                                 size += sizeof (struct mlx4_wqe_fmr_seg) / 16;
1753                                 break;
1754
1755                         default:
1756                                 /* No extra segments required for sends */
1757                                 break;
1758                         }
1759                         break;
1760
1761                 case IB_QPT_UD:
1762                         set_datagram_seg(wqe, wr);
1763                         wqe  += sizeof (struct mlx4_wqe_datagram_seg);
1764                         size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
1765
1766                         if (wr->opcode == IB_WR_LSO) {
1767                                 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh);
1768                                 if (unlikely(err)) {
1769                                         *bad_wr = wr;
1770                                         goto out;
1771                                 }
1772                                 lso_wqe = (__be32 *) wqe;
1773                                 wqe  += seglen;
1774                                 size += seglen / 16;
1775                         }
1776                         break;
1777
1778                 case IB_QPT_SMI:
1779                 case IB_QPT_GSI:
1780                         err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen);
1781                         if (unlikely(err)) {
1782                                 *bad_wr = wr;
1783                                 goto out;
1784                         }
1785                         wqe  += seglen;
1786                         size += seglen / 16;
1787                         break;
1788
1789                 default:
1790                         break;
1791                 }
1792
1793                 /*
1794                  * Write data segments in reverse order, so as to
1795                  * overwrite cacheline stamp last within each
1796                  * cacheline.  This avoids issues with WQE
1797                  * prefetching.
1798                  */
1799
1800                 dseg = wqe;
1801                 dseg += wr->num_sge - 1;
1802                 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16);
1803
1804                 /* Add one more inline data segment for ICRC for MLX sends */
1805                 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI ||
1806                              qp->ibqp.qp_type == IB_QPT_GSI)) {
1807                         set_mlx_icrc_seg(dseg + 1);
1808                         size += sizeof (struct mlx4_wqe_data_seg) / 16;
1809                 }
1810
1811                 for (i = wr->num_sge - 1; i >= 0; --i, --dseg)
1812                         set_data_seg(dseg, wr->sg_list + i);
1813
1814                 /*
1815                  * Possibly overwrite stamping in cacheline with LSO
1816                  * segment only after making sure all data segments
1817                  * are written.
1818                  */
1819                 wmb();
1820                 *lso_wqe = lso_hdr_sz;
1821
1822                 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
1823                                     MLX4_WQE_CTRL_FENCE : 0) | size;
1824
1825                 /*
1826                  * Make sure descriptor is fully written before
1827                  * setting ownership bit (because HW can start
1828                  * executing as soon as we do).
1829                  */
1830                 wmb();
1831
1832                 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
1833                         err = -EINVAL;
1834                         goto out;
1835                 }
1836
1837                 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
1838                         (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh;
1839
1840                 stamp = ind + qp->sq_spare_wqes;
1841                 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift);
1842
1843                 /*
1844                  * We can improve latency by not stamping the last
1845                  * send queue WQE until after ringing the doorbell, so
1846                  * only stamp here if there are still more WQEs to post.
1847                  *
1848                  * Same optimization applies to padding with NOP wqe
1849                  * in case of WQE shrinking (used to prevent wrap-around
1850                  * in the middle of WR).
1851                  */
1852                 if (wr->next) {
1853                         stamp_send_wqe(qp, stamp, size * 16);
1854                         ind = pad_wraparound(qp, ind);
1855                 }
1856         }
1857
1858 out:
1859         if (likely(nreq)) {
1860                 qp->sq.head += nreq;
1861
1862                 /*
1863                  * Make sure that descriptors are written before
1864                  * doorbell record.
1865                  */
1866                 wmb();
1867
1868                 writel(qp->doorbell_qpn,
1869                        to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
1870
1871                 /*
1872                  * Make sure doorbells don't leak out of SQ spinlock
1873                  * and reach the HCA out of order.
1874                  */
1875                 mmiowb();
1876
1877                 stamp_send_wqe(qp, stamp, size * 16);
1878
1879                 ind = pad_wraparound(qp, ind);
1880                 qp->sq_next_wqe = ind;
1881         }
1882
1883         spin_unlock_irqrestore(&qp->sq.lock, flags);
1884
1885         return err;
1886 }
1887
1888 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1889                       struct ib_recv_wr **bad_wr)
1890 {
1891         struct mlx4_ib_qp *qp = to_mqp(ibqp);
1892         struct mlx4_wqe_data_seg *scat;
1893         unsigned long flags;
1894         int err = 0;
1895         int nreq;
1896         int ind;
1897         int i;
1898
1899         spin_lock_irqsave(&qp->rq.lock, flags);
1900
1901         ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
1902
1903         for (nreq = 0; wr; ++nreq, wr = wr->next) {
1904                 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1905                         err = -ENOMEM;
1906                         *bad_wr = wr;
1907                         goto out;
1908                 }
1909
1910                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1911                         err = -EINVAL;
1912                         *bad_wr = wr;
1913                         goto out;
1914                 }
1915
1916                 scat = get_recv_wqe(qp, ind);
1917
1918                 for (i = 0; i < wr->num_sge; ++i)
1919                         __set_data_seg(scat + i, wr->sg_list + i);
1920
1921                 if (i < qp->rq.max_gs) {
1922                         scat[i].byte_count = 0;
1923                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
1924                         scat[i].addr       = 0;
1925                 }
1926
1927                 qp->rq.wrid[ind] = wr->wr_id;
1928
1929                 ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
1930         }
1931
1932 out:
1933         if (likely(nreq)) {
1934                 qp->rq.head += nreq;
1935
1936                 /*
1937                  * Make sure that descriptors are written before
1938                  * doorbell record.
1939                  */
1940                 wmb();
1941
1942                 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
1943         }
1944
1945         spin_unlock_irqrestore(&qp->rq.lock, flags);
1946
1947         return err;
1948 }
1949
1950 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
1951 {
1952         switch (mlx4_state) {
1953         case MLX4_QP_STATE_RST:      return IB_QPS_RESET;
1954         case MLX4_QP_STATE_INIT:     return IB_QPS_INIT;
1955         case MLX4_QP_STATE_RTR:      return IB_QPS_RTR;
1956         case MLX4_QP_STATE_RTS:      return IB_QPS_RTS;
1957         case MLX4_QP_STATE_SQ_DRAINING:
1958         case MLX4_QP_STATE_SQD:      return IB_QPS_SQD;
1959         case MLX4_QP_STATE_SQER:     return IB_QPS_SQE;
1960         case MLX4_QP_STATE_ERR:      return IB_QPS_ERR;
1961         default:                     return -1;
1962         }
1963 }
1964
1965 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
1966 {
1967         switch (mlx4_mig_state) {
1968         case MLX4_QP_PM_ARMED:          return IB_MIG_ARMED;
1969         case MLX4_QP_PM_REARM:          return IB_MIG_REARM;
1970         case MLX4_QP_PM_MIGRATED:       return IB_MIG_MIGRATED;
1971         default: return -1;
1972         }
1973 }
1974
1975 static int to_ib_qp_access_flags(int mlx4_flags)
1976 {
1977         int ib_flags = 0;
1978
1979         if (mlx4_flags & MLX4_QP_BIT_RRE)
1980                 ib_flags |= IB_ACCESS_REMOTE_READ;
1981         if (mlx4_flags & MLX4_QP_BIT_RWE)
1982                 ib_flags |= IB_ACCESS_REMOTE_WRITE;
1983         if (mlx4_flags & MLX4_QP_BIT_RAE)
1984                 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
1985
1986         return ib_flags;
1987 }
1988
1989 static void to_ib_ah_attr(struct mlx4_ib_dev *ibdev, struct ib_ah_attr *ib_ah_attr,
1990                                 struct mlx4_qp_path *path)
1991 {
1992         struct mlx4_dev *dev = ibdev->dev;
1993         int is_eth;
1994
1995         memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
1996         ib_ah_attr->port_num      = path->sched_queue & 0x40 ? 2 : 1;
1997
1998         if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
1999                 return;
2000
2001         is_eth = rdma_port_get_link_layer(&ibdev->ib_dev, ib_ah_attr->port_num) ==
2002                 IB_LINK_LAYER_ETHERNET;
2003         if (is_eth)
2004                 ib_ah_attr->sl = ((path->sched_queue >> 3) & 0x7) |
2005                 ((path->sched_queue & 4) << 1);
2006         else
2007                 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf;
2008
2009         ib_ah_attr->dlid          = be16_to_cpu(path->rlid);
2010         ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
2011         ib_ah_attr->static_rate   = path->static_rate ? path->static_rate - 5 : 0;
2012         ib_ah_attr->ah_flags      = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
2013         if (ib_ah_attr->ah_flags) {
2014                 ib_ah_attr->grh.sgid_index = path->mgid_index;
2015                 ib_ah_attr->grh.hop_limit  = path->hop_limit;
2016                 ib_ah_attr->grh.traffic_class =
2017                         (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
2018                 ib_ah_attr->grh.flow_label =
2019                         be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
2020                 memcpy(ib_ah_attr->grh.dgid.raw,
2021                         path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
2022         }
2023 }
2024
2025 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
2026                      struct ib_qp_init_attr *qp_init_attr)
2027 {
2028         struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
2029         struct mlx4_ib_qp *qp = to_mqp(ibqp);
2030         struct mlx4_qp_context context;
2031         int mlx4_state;
2032         int err = 0;
2033
2034         mutex_lock(&qp->mutex);
2035
2036         if (qp->state == IB_QPS_RESET) {
2037                 qp_attr->qp_state = IB_QPS_RESET;
2038                 goto done;
2039         }
2040
2041         err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
2042         if (err) {
2043                 err = -EINVAL;
2044                 goto out;
2045         }
2046
2047         mlx4_state = be32_to_cpu(context.flags) >> 28;
2048
2049         qp->state                    = to_ib_qp_state(mlx4_state);
2050         qp_attr->qp_state            = qp->state;
2051         qp_attr->path_mtu            = context.mtu_msgmax >> 5;
2052         qp_attr->path_mig_state      =
2053                 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
2054         qp_attr->qkey                = be32_to_cpu(context.qkey);
2055         qp_attr->rq_psn              = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
2056         qp_attr->sq_psn              = be32_to_cpu(context.next_send_psn) & 0xffffff;
2057         qp_attr->dest_qp_num         = be32_to_cpu(context.remote_qpn) & 0xffffff;
2058         qp_attr->qp_access_flags     =
2059                 to_ib_qp_access_flags(be32_to_cpu(context.params2));
2060
2061         if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
2062                 to_ib_ah_attr(dev, &qp_attr->ah_attr, &context.pri_path);
2063                 to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context.alt_path);
2064                 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
2065                 qp_attr->alt_port_num   = qp_attr->alt_ah_attr.port_num;
2066         }
2067
2068         qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
2069         if (qp_attr->qp_state == IB_QPS_INIT)
2070                 qp_attr->port_num = qp->port;
2071         else
2072                 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;
2073
2074         /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
2075         qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;
2076
2077         qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);
2078
2079         qp_attr->max_dest_rd_atomic =
2080                 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
2081         qp_attr->min_rnr_timer      =
2082                 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
2083         qp_attr->timeout            = context.pri_path.ackto >> 3;
2084         qp_attr->retry_cnt          = (be32_to_cpu(context.params1) >> 16) & 0x7;
2085         qp_attr->rnr_retry          = (be32_to_cpu(context.params1) >> 13) & 0x7;
2086         qp_attr->alt_timeout        = context.alt_path.ackto >> 3;
2087
2088 done:
2089         qp_attr->cur_qp_state        = qp_attr->qp_state;
2090         qp_attr->cap.max_recv_wr     = qp->rq.wqe_cnt;
2091         qp_attr->cap.max_recv_sge    = qp->rq.max_gs;
2092
2093         if (!ibqp->uobject) {
2094                 qp_attr->cap.max_send_wr  = qp->sq.wqe_cnt;
2095                 qp_attr->cap.max_send_sge = qp->sq.max_gs;
2096         } else {
2097                 qp_attr->cap.max_send_wr  = 0;
2098                 qp_attr->cap.max_send_sge = 0;
2099         }
2100
2101         /*
2102          * We don't support inline sends for kernel QPs (yet), and we
2103          * don't know what userspace's value should be.
2104          */
2105         qp_attr->cap.max_inline_data = 0;
2106
2107         qp_init_attr->cap            = qp_attr->cap;
2108
2109         qp_init_attr->create_flags = 0;
2110         if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK)
2111                 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
2112
2113         if (qp->flags & MLX4_IB_QP_LSO)
2114                 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
2115
2116 out:
2117         mutex_unlock(&qp->mutex);
2118         return err;
2119 }
2120