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 #include <rdma/ib_mad.h>
  42
  43 #include <linux/mlx4/qp.h>
  44
  45 #include "mlx4_ib.h"
  46 #include "user.h"
  47
  48 enum {
  49         MLX4_IB_ACK_REQ_FREQ    = 8,
  50 };
  51
  52 enum {
  53         MLX4_IB_DEFAULT_SCHED_QUEUE     = 0x83,
  54         MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f,
  55         MLX4_IB_LINK_TYPE_IB            = 0,
  56         MLX4_IB_LINK_TYPE_ETH           = 1
  57 };
  58
  59 enum {
  60         /*
  61          * Largest possible UD header: send with GRH and immediate
  62          * data plus 18 bytes for an Ethernet header with VLAN/802.1Q
  63          * tag.  (LRH would only use 8 bytes, so Ethernet is the
  64          * biggest case)
  65          */
  66         MLX4_IB_UD_HEADER_SIZE          = 82,
  67         MLX4_IB_LSO_HEADER_SPARE        = 128,
  68 };
  69
  70 enum {
  71         MLX4_IB_IBOE_ETHERTYPE          = 0x8915
  72 };
  73
  74 struct mlx4_ib_sqp {
  75         struct mlx4_ib_qp       qp;
  76         int                     pkey_index;
  77         u32                     qkey;
  78         u32                     send_psn;
  79         struct ib_ud_header     ud_header;
  80         u8                      header_buf[MLX4_IB_UD_HEADER_SIZE];
  81 };
  82
  83 enum {
  84         MLX4_IB_MIN_SQ_STRIDE   = 6,
  85         MLX4_IB_CACHE_LINE_SIZE = 64,
  86 };
  87
  88 enum {
  89         MLX4_RAW_QP_MTU         = 7,
  90         MLX4_RAW_QP_MSGMAX      = 31,
  91 };
  92
  93 static const __be32 mlx4_ib_opcode[] = {
  94         [IB_WR_SEND]                            = cpu_to_be32(MLX4_OPCODE_SEND),
  95         [IB_WR_LSO]                             = cpu_to_be32(MLX4_OPCODE_LSO),
  96         [IB_WR_SEND_WITH_IMM]                   = cpu_to_be32(MLX4_OPCODE_SEND_IMM),
  97         [IB_WR_RDMA_WRITE]                      = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
  98         [IB_WR_RDMA_WRITE_WITH_IMM]             = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
  99         [IB_WR_RDMA_READ]                       = cpu_to_be32(MLX4_OPCODE_RDMA_READ),
 100         [IB_WR_ATOMIC_CMP_AND_SWP]              = cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
 101         [IB_WR_ATOMIC_FETCH_AND_ADD]            = cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
 102         [IB_WR_SEND_WITH_INV]                   = cpu_to_be32(MLX4_OPCODE_SEND_INVAL),
 103         [IB_WR_LOCAL_INV]                       = cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL),
 104         [IB_WR_FAST_REG_MR]                     = cpu_to_be32(MLX4_OPCODE_FMR),
 105         [IB_WR_MASKED_ATOMIC_CMP_AND_SWP]       = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_CS),
 106         [IB_WR_MASKED_ATOMIC_FETCH_AND_ADD]     = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_FA),
 107         [IB_WR_BIND_MW]                         = cpu_to_be32(MLX4_OPCODE_BIND_MW),
 108 };
 109
 110 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
 111 {
 112         return container_of(mqp, struct mlx4_ib_sqp, qp);
 113 }
 114
 115 static int is_tunnel_qp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
 116 {
 117         if (!mlx4_is_master(dev->dev))
 118                 return 0;
 119
 120         return qp->mqp.qpn >= dev->dev->phys_caps.base_tunnel_sqpn &&
 121                qp->mqp.qpn < dev->dev->phys_caps.base_tunnel_sqpn +
 122                 8 * MLX4_MFUNC_MAX;
 123 }
 124
 125 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
 126 {
 127         int proxy_sqp = 0;
 128         int real_sqp = 0;
 129         int i;
 130         /* PPF or Native -- real SQP */
 131         real_sqp = ((mlx4_is_master(dev->dev) || !mlx4_is_mfunc(dev->dev)) &&
 132                     qp->mqp.qpn >= dev->dev->phys_caps.base_sqpn &&
 133                     qp->mqp.qpn <= dev->dev->phys_caps.base_sqpn + 3);
 134         if (real_sqp)
 135                 return 1;
 136         /* VF or PF -- proxy SQP */
 137         if (mlx4_is_mfunc(dev->dev)) {
 138                 for (i = 0; i < dev->dev->caps.num_ports; i++) {
 139                         if (qp->mqp.qpn == dev->dev->caps.qp0_proxy[i] ||
 140                             qp->mqp.qpn == dev->dev->caps.qp1_proxy[i]) {
 141                                 proxy_sqp = 1;
 142                                 break;
 143                         }
 144                 }
 145         }
 146         return proxy_sqp;
 147 }
 148
 149 /* used for INIT/CLOSE port logic */
 150 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
 151 {
 152         int proxy_qp0 = 0;
 153         int real_qp0 = 0;
 154         int i;
 155         /* PPF or Native -- real QP0 */
 156         real_qp0 = ((mlx4_is_master(dev->dev) || !mlx4_is_mfunc(dev->dev)) &&
 157                     qp->mqp.qpn >= dev->dev->phys_caps.base_sqpn &&
 158                     qp->mqp.qpn <= dev->dev->phys_caps.base_sqpn + 1);
 159         if (real_qp0)
 160                 return 1;
 161         /* VF or PF -- proxy QP0 */
 162         if (mlx4_is_mfunc(dev->dev)) {
 163                 for (i = 0; i < dev->dev->caps.num_ports; i++) {
 164                         if (qp->mqp.qpn == dev->dev->caps.qp0_proxy[i]) {
 165                                 proxy_qp0 = 1;
 166                                 break;
 167                         }
 168                 }
 169         }
 170         return proxy_qp0;
 171 }
 172
 173 static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
 174 {
 175         return mlx4_buf_offset(&qp->buf, offset);
 176 }
 177
 178 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
 179 {
 180         return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
 181 }
 182
 183 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
 184 {
 185         return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
 186 }
 187
 188 /*
 189  * Stamp a SQ WQE so that it is invalid if prefetched by marking the
 190  * first four bytes of every 64 byte chunk with
 191  *     0x7FFFFFF | (invalid_ownership_value << 31).
 192  *
 193  * When the max work request size is less than or equal to the WQE
 194  * basic block size, as an optimization, we can stamp all WQEs with
 195  * 0xffffffff, and skip the very first chunk of each WQE.
 196  */
 197 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size)
 198 {
 199         __be32 *wqe;
 200         int i;
 201         int s;
 202         int ind;
 203         void *buf;
 204         __be32 stamp;
 205         struct mlx4_wqe_ctrl_seg *ctrl;
 206
 207         if (qp->sq_max_wqes_per_wr > 1) {
 208                 s = roundup(size, 1U << qp->sq.wqe_shift);
 209                 for (i = 0; i < s; i += 64) {
 210                         ind = (i >> qp->sq.wqe_shift) + n;
 211                         stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) :
 212                                                        cpu_to_be32(0xffffffff);
 213                         buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
 214                         wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1));
 215                         *wqe = stamp;
 216                 }
 217         } else {
 218                 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
 219                 s = (ctrl->fence_size & 0x3f) << 4;
 220                 for (i = 64; i < s; i += 64) {
 221                         wqe = buf + i;
 222                         *wqe = cpu_to_be32(0xffffffff);
 223                 }
 224         }
 225 }
 226
 227 static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size)
 228 {
 229         struct mlx4_wqe_ctrl_seg *ctrl;
 230         struct mlx4_wqe_inline_seg *inl;
 231         void *wqe;
 232         int s;
 233
 234         ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
 235         s = sizeof(struct mlx4_wqe_ctrl_seg);
 236
 237         if (qp->ibqp.qp_type == IB_QPT_UD) {
 238                 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl;
 239                 struct mlx4_av *av = (struct mlx4_av *)dgram->av;
 240                 memset(dgram, 0, sizeof *dgram);
 241                 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn);
 242                 s += sizeof(struct mlx4_wqe_datagram_seg);
 243         }
 244
 245         /* Pad the remainder of the WQE with an inline data segment. */
 246         if (size > s) {
 247                 inl = wqe + s;
 248                 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl));
 249         }
 250         ctrl->srcrb_flags = 0;
 251         ctrl->fence_size = size / 16;
 252         /*
 253          * Make sure descriptor is fully written before setting ownership bit
 254          * (because HW can start executing as soon as we do).
 255          */
 256         wmb();
 257
 258         ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) |
 259                 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);
 260
 261         stamp_send_wqe(qp, n + qp->sq_spare_wqes, size);
 262 }
 263
 264 /* Post NOP WQE to prevent wrap-around in the middle of WR */
 265 static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind)
 266 {
 267         unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1));
 268         if (unlikely(s < qp->sq_max_wqes_per_wr)) {
 269                 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift);
 270                 ind += s;
 271         }
 272         return ind;
 273 }
 274
 275 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
 276 {
 277         struct ib_event event;
 278         struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;
 279
 280         if (type == MLX4_EVENT_TYPE_PATH_MIG)
 281                 to_mibqp(qp)->port = to_mibqp(qp)->alt_port;
 282
 283         if (ibqp->event_handler) {
 284                 event.device     = ibqp->device;
 285                 event.element.qp = ibqp;
 286                 switch (type) {
 287                 case MLX4_EVENT_TYPE_PATH_MIG:
 288                         event.event = IB_EVENT_PATH_MIG;
 289                         break;
 290                 case MLX4_EVENT_TYPE_COMM_EST:
 291                         event.event = IB_EVENT_COMM_EST;
 292                         break;
 293                 case MLX4_EVENT_TYPE_SQ_DRAINED:
 294                         event.event = IB_EVENT_SQ_DRAINED;
 295                         break;
 296                 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
 297                         event.event = IB_EVENT_QP_LAST_WQE_REACHED;
 298                         break;
 299                 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
 300                         event.event = IB_EVENT_QP_FATAL;
 301                         break;
 302                 case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
 303                         event.event = IB_EVENT_PATH_MIG_ERR;
 304                         break;
 305                 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
 306                         event.event = IB_EVENT_QP_REQ_ERR;
 307                         break;
 308                 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
 309                         event.event = IB_EVENT_QP_ACCESS_ERR;
 310                         break;
 311                 default:
 312                         pr_warn("Unexpected event type %d "
 313                                "on QP %06x\n", type, qp->qpn);
 314                         return;
 315                 }
 316
 317                 ibqp->event_handler(&event, ibqp->qp_context);
 318         }
 319 }
 320
 321 static int send_wqe_overhead(enum mlx4_ib_qp_type type, u32 flags)
 322 {
 323         /*
 324          * UD WQEs must have a datagram segment.
 325          * RC and UC WQEs might have a remote address segment.
 326          * MLX WQEs need two extra inline data segments (for the UD
 327          * header and space for the ICRC).
 328          */
 329         switch (type) {
 330         case MLX4_IB_QPT_UD:
 331                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 332                         sizeof (struct mlx4_wqe_datagram_seg) +
 333                         ((flags & MLX4_IB_QP_LSO) ? MLX4_IB_LSO_HEADER_SPARE : 0);
 334         case MLX4_IB_QPT_PROXY_SMI_OWNER:
 335         case MLX4_IB_QPT_PROXY_SMI:
 336         case MLX4_IB_QPT_PROXY_GSI:
 337                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 338                         sizeof (struct mlx4_wqe_datagram_seg) + 64;
 339         case MLX4_IB_QPT_TUN_SMI_OWNER:
 340         case MLX4_IB_QPT_TUN_GSI:
 341                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 342                         sizeof (struct mlx4_wqe_datagram_seg);
 343
 344         case MLX4_IB_QPT_UC:
 345                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 346                         sizeof (struct mlx4_wqe_raddr_seg);
 347         case MLX4_IB_QPT_RC:
 348                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 349                         sizeof (struct mlx4_wqe_atomic_seg) +
 350                         sizeof (struct mlx4_wqe_raddr_seg);
 351         case MLX4_IB_QPT_SMI:
 352         case MLX4_IB_QPT_GSI:
 353                 return sizeof (struct mlx4_wqe_ctrl_seg) +
 354                         ALIGN(MLX4_IB_UD_HEADER_SIZE +
 355                               DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE,
 356                                            MLX4_INLINE_ALIGN) *
 357                               sizeof (struct mlx4_wqe_inline_seg),
 358                               sizeof (struct mlx4_wqe_data_seg)) +
 359                         ALIGN(4 +
 360                               sizeof (struct mlx4_wqe_inline_seg),
 361                               sizeof (struct mlx4_wqe_data_seg));
 362         default:
 363                 return sizeof (struct mlx4_wqe_ctrl_seg);
 364         }
 365 }
 366
 367 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
 368                        int is_user, int has_rq, struct mlx4_ib_qp *qp)
 369 {
 370         /* Sanity check RQ size before proceeding */
 371         if (cap->max_recv_wr > dev->dev->caps.max_wqes - MLX4_IB_SQ_MAX_SPARE ||
 372             cap->max_recv_sge > min(dev->dev->caps.max_sq_sg, dev->dev->caps.max_rq_sg))
 373                 return -EINVAL;
 374
 375         if (!has_rq) {
 376                 if (cap->max_recv_wr)
 377                         return -EINVAL;
 378
 379                 qp->rq.wqe_cnt = qp->rq.max_gs = 0;
 380         } else {
 381                 /* HW requires >= 1 RQ entry with >= 1 gather entry */
 382                 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
 383                         return -EINVAL;
 384
 385                 qp->rq.wqe_cnt   = roundup_pow_of_two(max(1U, cap->max_recv_wr));
 386                 qp->rq.max_gs    = roundup_pow_of_two(max(1U, cap->max_recv_sge));
 387                 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
 388         }
 389
 390         /* leave userspace return values as they were, so as not to break ABI */
 391         if (is_user) {
 392                 cap->max_recv_wr  = qp->rq.max_post = qp->rq.wqe_cnt;
 393                 cap->max_recv_sge = qp->rq.max_gs;
 394         } else {
 395                 cap->max_recv_wr  = qp->rq.max_post =
 396                         min(dev->dev->caps.max_wqes - MLX4_IB_SQ_MAX_SPARE, qp->rq.wqe_cnt);
 397                 cap->max_recv_sge = min(qp->rq.max_gs,
 398                                         min(dev->dev->caps.max_sq_sg,
 399                                             dev->dev->caps.max_rq_sg));
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
 406                               enum mlx4_ib_qp_type type, struct mlx4_ib_qp *qp)
 407 {
 408         int s;
 409
 410         /* Sanity check SQ size before proceeding */
 411         if (cap->max_send_wr  > (dev->dev->caps.max_wqes - MLX4_IB_SQ_MAX_SPARE) ||
 412             cap->max_send_sge > min(dev->dev->caps.max_sq_sg, dev->dev->caps.max_rq_sg) ||
 413             cap->max_inline_data + send_wqe_overhead(type, qp->flags) +
 414             sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
 415                 return -EINVAL;
 416
 417         /*
 418          * For MLX transport we need 2 extra S/G entries:
 419          * one for the header and one for the checksum at the end
 420          */
 421         if ((type == MLX4_IB_QPT_SMI || type == MLX4_IB_QPT_GSI ||
 422              type & (MLX4_IB_QPT_PROXY_SMI_OWNER | MLX4_IB_QPT_TUN_SMI_OWNER)) &&
 423             cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
 424                 return -EINVAL;
 425
 426         s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg),
 427                 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) +
 428                 send_wqe_overhead(type, qp->flags);
 429
 430         if (s > dev->dev->caps.max_sq_desc_sz)
 431                 return -EINVAL;
 432
 433         /*
 434          * Hermon supports shrinking WQEs, such that a single work
 435          * request can include multiple units of 1 << wqe_shift.  This
 436          * way, work requests can differ in size, and do not have to
 437          * be a power of 2 in size, saving memory and speeding up send
 438          * WR posting.  Unfortunately, if we do this then the
 439          * wqe_index field in CQEs can't be used to look up the WR ID
 440          * anymore, so we do this only if selective signaling is off.
 441          *
 442          * Further, on 32-bit platforms, we can't use vmap() to make
 443          * the QP buffer virtually contiguous.  Thus we have to use
 444          * constant-sized WRs to make sure a WR is always fully within
 445          * a single page-sized chunk.
 446          *
 447          * Finally, we use NOP work requests to pad the end of the
 448          * work queue, to avoid wrap-around in the middle of WR.  We
 449          * set NEC bit to avoid getting completions with error for
 450          * these NOP WRs, but since NEC is only supported starting
 451          * with firmware 2.2.232, we use constant-sized WRs for older
 452          * firmware.
 453          *
 454          * And, since MLX QPs only support SEND, we use constant-sized
 455          * WRs in this case.
 456          *
 457          * We look for the smallest value of wqe_shift such that the
 458          * resulting number of wqes does not exceed device
 459          * capabilities.
 460          *
 461          * We set WQE size to at least 64 bytes, this way stamping
 462          * invalidates each WQE.
 463          */
 464         if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC &&
 465             qp->sq_signal_bits && BITS_PER_LONG == 64 &&
 466             type != MLX4_IB_QPT_SMI && type != MLX4_IB_QPT_GSI &&
 467             !(type & (MLX4_IB_QPT_PROXY_SMI_OWNER | MLX4_IB_QPT_PROXY_SMI |
 468                       MLX4_IB_QPT_PROXY_GSI | MLX4_IB_QPT_TUN_SMI_OWNER)))
 469                 qp->sq.wqe_shift = ilog2(64);
 470         else
 471                 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s));
 472
 473         for (;;) {
 474                 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift);
 475
 476                 /*
 477                  * We need to leave 2 KB + 1 WR of headroom in the SQ to
 478                  * allow HW to prefetch.
 479                  */
 480                 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr;
 481                 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr *
 482                                                     qp->sq_max_wqes_per_wr +
 483                                                     qp->sq_spare_wqes);
 484
 485                 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes)
 486                         break;
 487
 488                 if (qp->sq_max_wqes_per_wr <= 1)
 489                         return -EINVAL;
 490
 491                 ++qp->sq.wqe_shift;
 492         }
 493
 494         qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz,
 495                              (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) -
 496                          send_wqe_overhead(type, qp->flags)) /
 497                 sizeof (struct mlx4_wqe_data_seg);
 498
 499         qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
 500                 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
 501         if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
 502                 qp->rq.offset = 0;
 503                 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
 504         } else {
 505                 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
 506                 qp->sq.offset = 0;
 507         }
 508
 509         cap->max_send_wr  = qp->sq.max_post =
 510                 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr;
 511         cap->max_send_sge = min(qp->sq.max_gs,
 512                                 min(dev->dev->caps.max_sq_sg,
 513                                     dev->dev->caps.max_rq_sg));
 514         /* We don't support inline sends for kernel QPs (yet) */
 515         cap->max_inline_data = 0;
 516
 517         return 0;
 518 }
 519
 520 static int set_user_sq_size(struct mlx4_ib_dev *dev,
 521                             struct mlx4_ib_qp *qp,
 522                             struct mlx4_ib_create_qp *ucmd)
 523 {
 524         /* Sanity check SQ size before proceeding */
 525         if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes       ||
 526             ucmd->log_sq_stride >
 527                 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) ||
 528             ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
 529                 return -EINVAL;
 530
 531         qp->sq.wqe_cnt   = 1 << ucmd->log_sq_bb_count;
 532         qp->sq.wqe_shift = ucmd->log_sq_stride;
 533
 534         qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
 535                 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
 536
 537         return 0;
 538 }
 539
 540 static int alloc_proxy_bufs(struct ib_device *dev, struct mlx4_ib_qp *qp)
 541 {
 542         int i;
 543
 544         qp->sqp_proxy_rcv =
 545                 kmalloc(sizeof (struct mlx4_ib_buf) * qp->rq.wqe_cnt,
 546                         GFP_KERNEL);
 547         if (!qp->sqp_proxy_rcv)
 548                 return -ENOMEM;
 549         for (i = 0; i < qp->rq.wqe_cnt; i++) {
 550                 qp->sqp_proxy_rcv[i].addr =
 551                         kmalloc(sizeof (struct mlx4_ib_proxy_sqp_hdr),
 552                                 GFP_KERNEL);
 553                 if (!qp->sqp_proxy_rcv[i].addr)
 554                         goto err;
 555                 qp->sqp_proxy_rcv[i].map =
 556                         ib_dma_map_single(dev, qp->sqp_proxy_rcv[i].addr,
 557                                           sizeof (struct mlx4_ib_proxy_sqp_hdr),
 558                                           DMA_FROM_DEVICE);
 559         }
 560         return 0;
 561
 562 err:
 563         while (i > 0) {
 564                 --i;
 565                 ib_dma_unmap_single(dev, qp->sqp_proxy_rcv[i].map,
 566                                     sizeof (struct mlx4_ib_proxy_sqp_hdr),
 567                                     DMA_FROM_DEVICE);
 568                 kfree(qp->sqp_proxy_rcv[i].addr);
 569         }
 570         kfree(qp->sqp_proxy_rcv);
 571         qp->sqp_proxy_rcv = NULL;
 572         return -ENOMEM;
 573 }
 574
 575 static void free_proxy_bufs(struct ib_device *dev, struct mlx4_ib_qp *qp)
 576 {
 577         int i;
 578
 579         for (i = 0; i < qp->rq.wqe_cnt; i++) {
 580                 ib_dma_unmap_single(dev, qp->sqp_proxy_rcv[i].map,
 581                                     sizeof (struct mlx4_ib_proxy_sqp_hdr),
 582                                     DMA_FROM_DEVICE);
 583                 kfree(qp->sqp_proxy_rcv[i].addr);
 584         }
 585         kfree(qp->sqp_proxy_rcv);
 586 }
 587
 588 static int qp_has_rq(struct ib_qp_init_attr *attr)
 589 {
 590         if (attr->qp_type == IB_QPT_XRC_INI || attr->qp_type == IB_QPT_XRC_TGT)
 591                 return 0;
 592
 593         return !attr->srq;
 594 }
 595
 596 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
 597                             struct ib_qp_init_attr *init_attr,
 598                             struct ib_udata *udata, int sqpn, struct mlx4_ib_qp **caller_qp)
 599 {
 600         int qpn;
 601         int err;
 602         struct mlx4_ib_sqp *sqp;
 603         struct mlx4_ib_qp *qp;
 604         enum mlx4_ib_qp_type qp_type = (enum mlx4_ib_qp_type) init_attr->qp_type;
 605
 606         /* When tunneling special qps, we use a plain UD qp */
 607         if (sqpn) {
 608                 if (mlx4_is_mfunc(dev->dev) &&
 609                     (!mlx4_is_master(dev->dev) ||
 610                      !(init_attr->create_flags & MLX4_IB_SRIOV_SQP))) {
 611                         if (init_attr->qp_type == IB_QPT_GSI)
 612                                 qp_type = MLX4_IB_QPT_PROXY_GSI;
 613                         else if (mlx4_is_master(dev->dev))
 614                                 qp_type = MLX4_IB_QPT_PROXY_SMI_OWNER;
 615                         else
 616                                 qp_type = MLX4_IB_QPT_PROXY_SMI;
 617                 }
 618                 qpn = sqpn;
 619                 /* add extra sg entry for tunneling */
 620                 init_attr->cap.max_recv_sge++;
 621         } else if (init_attr->create_flags & MLX4_IB_SRIOV_TUNNEL_QP) {
 622                 struct mlx4_ib_qp_tunnel_init_attr *tnl_init =
 623                         container_of(init_attr,
 624                                      struct mlx4_ib_qp_tunnel_init_attr, init_attr);
 625                 if ((tnl_init->proxy_qp_type != IB_QPT_SMI &&
 626                      tnl_init->proxy_qp_type != IB_QPT_GSI)   ||
 627                     !mlx4_is_master(dev->dev))
 628                         return -EINVAL;
 629                 if (tnl_init->proxy_qp_type == IB_QPT_GSI)
 630                         qp_type = MLX4_IB_QPT_TUN_GSI;
 631                 else if (tnl_init->slave == mlx4_master_func_num(dev->dev))
 632                         qp_type = MLX4_IB_QPT_TUN_SMI_OWNER;
 633                 else
 634                         qp_type = MLX4_IB_QPT_TUN_SMI;
 635                 /* we are definitely in the PPF here, since we are creating
 636                  * tunnel QPs. base_tunnel_sqpn is therefore valid. */
 637                 qpn = dev->dev->phys_caps.base_tunnel_sqpn + 8 * tnl_init->slave
 638                         + tnl_init->proxy_qp_type * 2 + tnl_init->port - 1;
 639                 sqpn = qpn;
 640         }
 641
 642         if (!*caller_qp) {
 643                 if (qp_type == MLX4_IB_QPT_SMI || qp_type == MLX4_IB_QPT_GSI ||
 644                     (qp_type & (MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_SMI_OWNER |
 645                                 MLX4_IB_QPT_PROXY_GSI | MLX4_IB_QPT_TUN_SMI_OWNER))) {
 646                         sqp = kzalloc(sizeof (struct mlx4_ib_sqp), GFP_KERNEL);
 647                         if (!sqp)
 648                                 return -ENOMEM;
 649                         qp = &sqp->qp;
 650                 } else {
 651                         qp = kzalloc(sizeof (struct mlx4_ib_qp), GFP_KERNEL);
 652                         if (!qp)
 653                                 return -ENOMEM;
 654                 }
 655         } else
 656                 qp = *caller_qp;
 657
 658         qp->mlx4_ib_qp_type = qp_type;
 659
 660         mutex_init(&qp->mutex);
 661         spin_lock_init(&qp->sq.lock);
 662         spin_lock_init(&qp->rq.lock);
 663         INIT_LIST_HEAD(&qp->gid_list);
 664         INIT_LIST_HEAD(&qp->steering_rules);
 665
 666         qp->state        = IB_QPS_RESET;
 667         if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
 668                 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
 669
 670         err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, qp_has_rq(init_attr), qp);
 671         if (err)
 672                 goto err;
 673
 674         if (pd->uobject) {
 675                 struct mlx4_ib_create_qp ucmd;
 676
 677                 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
 678                         err = -EFAULT;
 679                         goto err;
 680                 }
 681
 682                 qp->sq_no_prefetch = ucmd.sq_no_prefetch;
 683
 684                 err = set_user_sq_size(dev, qp, &ucmd);
 685                 if (err)
 686                         goto err;
 687
 688                 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
 689                                        qp->buf_size, 0, 0);
 690                 if (IS_ERR(qp->umem)) {
 691                         err = PTR_ERR(qp->umem);
 692                         goto err;
 693                 }
 694
 695                 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
 696                                     ilog2(qp->umem->page_size), &qp->mtt);
 697                 if (err)
 698                         goto err_buf;
 699
 700                 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
 701                 if (err)
 702                         goto err_mtt;
 703
 704                 if (qp_has_rq(init_attr)) {
 705                         err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
 706                                                   ucmd.db_addr, &qp->db);
 707                         if (err)
 708                                 goto err_mtt;
 709                 }
 710         } else {
 711                 qp->sq_no_prefetch = 0;
 712
 713                 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)
 714                         qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK;
 715
 716                 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO)
 717                         qp->flags |= MLX4_IB_QP_LSO;
 718
 719                 err = set_kernel_sq_size(dev, &init_attr->cap, qp_type, qp);
 720                 if (err)
 721                         goto err;
 722
 723                 if (qp_has_rq(init_attr)) {
 724                         err = mlx4_db_alloc(dev->dev, &qp->db, 0);
 725                         if (err)
 726                                 goto err;
 727
 728                         *qp->db.db = 0;
 729                 }
 730
 731                 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
 732                         err = -ENOMEM;
 733                         goto err_db;
 734                 }
 735
 736                 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
 737                                     &qp->mtt);
 738                 if (err)
 739                         goto err_buf;
 740
 741                 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
 742                 if (err)
 743                         goto err_mtt;
 744
 745                 qp->sq.wrid  = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
 746                 qp->rq.wrid  = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
 747
 748                 if (!qp->sq.wrid || !qp->rq.wrid) {
 749                         err = -ENOMEM;
 750                         goto err_wrid;
 751                 }
 752         }
 753
 754         if (sqpn) {
 755                 if (qp->mlx4_ib_qp_type & (MLX4_IB_QPT_PROXY_SMI_OWNER |
 756                     MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI)) {
 757                         if (alloc_proxy_bufs(pd->device, qp)) {
 758                                 err = -ENOMEM;
 759                                 goto err_wrid;
 760                         }
 761                 }
 762         } else {
 763                 /* Raw packet QPNs must be aligned to 8 bits. If not, the WQE
 764                  * BlueFlame setup flow wrongly causes VLAN insertion. */
 765                 if (init_attr->qp_type == IB_QPT_RAW_PACKET)
 766                         err = mlx4_qp_reserve_range(dev->dev, 1, 1 << 8, &qpn);
 767                 else
 768                         err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn);
 769                 if (err)
 770                         goto err_proxy;
 771         }
 772
 773         err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp);
 774         if (err)
 775                 goto err_qpn;
 776
 777         if (init_attr->qp_type == IB_QPT_XRC_TGT)
 778                 qp->mqp.qpn |= (1 << 23);
 779
 780         /*
 781          * Hardware wants QPN written in big-endian order (after
 782          * shifting) for send doorbell.  Precompute this value to save
 783          * a little bit when posting sends.
 784          */
 785         qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
 786
 787         qp->mqp.event = mlx4_ib_qp_event;
 788         if (!*caller_qp)
 789                 *caller_qp = qp;
 790         return 0;
 791
 792 err_qpn:
 793         if (!sqpn)
 794                 mlx4_qp_release_range(dev->dev, qpn, 1);
 795 err_proxy:
 796         if (qp->mlx4_ib_qp_type == MLX4_IB_QPT_PROXY_GSI)
 797                 free_proxy_bufs(pd->device, qp);
 798 err_wrid:
 799         if (pd->uobject) {
 800                 if (qp_has_rq(init_attr))
 801                         mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &qp->db);
 802         } else {
 803                 kfree(qp->sq.wrid);
 804                 kfree(qp->rq.wrid);
 805         }
 806
 807 err_mtt:
 808         mlx4_mtt_cleanup(dev->dev, &qp->mtt);
 809
 810 err_buf:
 811         if (pd->uobject)
 812                 ib_umem_release(qp->umem);
 813         else
 814                 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
 815
 816 err_db:
 817         if (!pd->uobject && qp_has_rq(init_attr))
 818                 mlx4_db_free(dev->dev, &qp->db);
 819
 820 err:
 821         if (!*caller_qp)
 822                 kfree(qp);
 823         return err;
 824 }
 825
 826 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
 827 {
 828         switch (state) {
 829         case IB_QPS_RESET:      return MLX4_QP_STATE_RST;
 830         case IB_QPS_INIT:       return MLX4_QP_STATE_INIT;
 831         case IB_QPS_RTR:        return MLX4_QP_STATE_RTR;
 832         case IB_QPS_RTS:        return MLX4_QP_STATE_RTS;
 833         case IB_QPS_SQD:        return MLX4_QP_STATE_SQD;
 834         case IB_QPS_SQE:        return MLX4_QP_STATE_SQER;
 835         case IB_QPS_ERR:        return MLX4_QP_STATE_ERR;
 836         default:                return -1;
 837         }
 838 }
 839
 840 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
 841         __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
 842 {
 843         if (send_cq == recv_cq) {
 844                 spin_lock_irq(&send_cq->lock);
 845                 __acquire(&recv_cq->lock);
 846         } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
 847                 spin_lock_irq(&send_cq->lock);
 848                 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
 849         } else {
 850                 spin_lock_irq(&recv_cq->lock);
 851                 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
 852         }
 853 }
 854
 855 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
 856         __releases(&send_cq->lock) __releases(&recv_cq->lock)
 857 {
 858         if (send_cq == recv_cq) {
 859                 __release(&recv_cq->lock);
 860                 spin_unlock_irq(&send_cq->lock);
 861         } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
 862                 spin_unlock(&recv_cq->lock);
 863                 spin_unlock_irq(&send_cq->lock);
 864         } else {
 865                 spin_unlock(&send_cq->lock);
 866                 spin_unlock_irq(&recv_cq->lock);
 867         }
 868 }
 869
 870 static void del_gid_entries(struct mlx4_ib_qp *qp)
 871 {
 872         struct mlx4_ib_gid_entry *ge, *tmp;
 873
 874         list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
 875                 list_del(&ge->list);
 876                 kfree(ge);
 877         }
 878 }
 879
 880 static struct mlx4_ib_pd *get_pd(struct mlx4_ib_qp *qp)
 881 {
 882         if (qp->ibqp.qp_type == IB_QPT_XRC_TGT)
 883                 return to_mpd(to_mxrcd(qp->ibqp.xrcd)->pd);
 884         else
 885                 return to_mpd(qp->ibqp.pd);
 886 }
 887
 888 static void get_cqs(struct mlx4_ib_qp *qp,
 889                     struct mlx4_ib_cq **send_cq, struct mlx4_ib_cq **recv_cq)
 890 {
 891         switch (qp->ibqp.qp_type) {
 892         case IB_QPT_XRC_TGT:
 893                 *send_cq = to_mcq(to_mxrcd(qp->ibqp.xrcd)->cq);
 894                 *recv_cq = *send_cq;
 895                 break;
 896         case IB_QPT_XRC_INI:
 897                 *send_cq = to_mcq(qp->ibqp.send_cq);
 898                 *recv_cq = *send_cq;
 899                 break;
 900         default:
 901                 *send_cq = to_mcq(qp->ibqp.send_cq);
 902                 *recv_cq = to_mcq(qp->ibqp.recv_cq);
 903                 break;
 904         }
 905 }
 906
 907 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
 908                               int is_user)
 909 {
 910         struct mlx4_ib_cq *send_cq, *recv_cq;
 911
 912         if (qp->state != IB_QPS_RESET)
 913                 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
 914                                    MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
 915                         pr_warn("modify QP %06x to RESET failed.\n",
 916                                qp->mqp.qpn);
 917
 918         get_cqs(qp, &send_cq, &recv_cq);
 919
 920         mlx4_ib_lock_cqs(send_cq, recv_cq);
 921
 922         if (!is_user) {
 923                 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
 924                                  qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
 925                 if (send_cq != recv_cq)
 926                         __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
 927         }
 928
 929         mlx4_qp_remove(dev->dev, &qp->mqp);
 930
 931         mlx4_ib_unlock_cqs(send_cq, recv_cq);
 932
 933         mlx4_qp_free(dev->dev, &qp->mqp);
 934
 935         if (!is_sqp(dev, qp) && !is_tunnel_qp(dev, qp))
 936                 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1);
 937
 938         mlx4_mtt_cleanup(dev->dev, &qp->mtt);
 939
 940         if (is_user) {
 941                 if (qp->rq.wqe_cnt)
 942                         mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
 943                                               &qp->db);
 944                 ib_umem_release(qp->umem);
 945         } else {
 946                 kfree(qp->sq.wrid);
 947                 kfree(qp->rq.wrid);
 948                 if (qp->mlx4_ib_qp_type & (MLX4_IB_QPT_PROXY_SMI_OWNER |
 949                     MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI))
 950                         free_proxy_bufs(&dev->ib_dev, qp);
 951                 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
 952                 if (qp->rq.wqe_cnt)
 953                         mlx4_db_free(dev->dev, &qp->db);
 954         }
 955
 956         del_gid_entries(qp);
 957 }
 958
 959 static u32 get_sqp_num(struct mlx4_ib_dev *dev, struct ib_qp_init_attr *attr)
 960 {
 961         /* Native or PPF */
 962         if (!mlx4_is_mfunc(dev->dev) ||
 963             (mlx4_is_master(dev->dev) &&
 964              attr->create_flags & MLX4_IB_SRIOV_SQP)) {
 965                 return  dev->dev->phys_caps.base_sqpn +
 966                         (attr->qp_type == IB_QPT_SMI ? 0 : 2) +
 967                         attr->port_num - 1;
 968         }
 969         /* PF or VF -- creating proxies */
 970         if (attr->qp_type == IB_QPT_SMI)
 971                 return dev->dev->caps.qp0_proxy[attr->port_num - 1];
 972         else
 973                 return dev->dev->caps.qp1_proxy[attr->port_num - 1];
 974 }
 975
 976 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
 977                                 struct ib_qp_init_attr *init_attr,
 978                                 struct ib_udata *udata)
 979 {
 980         struct mlx4_ib_qp *qp = NULL;
 981         int err;
 982         u16 xrcdn = 0;
 983
 984         /*
 985          * We only support LSO, vendor flag1, and multicast loopback blocking,
 986          * and only for kernel UD QPs.
 987          */
 988         if (init_attr->create_flags & ~(MLX4_IB_QP_LSO |
 989                                         MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK |
 990                                         MLX4_IB_SRIOV_TUNNEL_QP | MLX4_IB_SRIOV_SQP))
 991                 return ERR_PTR(-EINVAL);
 992
 993         if (init_attr->create_flags &&
 994             (udata ||
 995              ((init_attr->create_flags & ~MLX4_IB_SRIOV_SQP) &&
 996               init_attr->qp_type != IB_QPT_UD) ||
 997              ((init_attr->create_flags & MLX4_IB_SRIOV_SQP) &&
 998               init_attr->qp_type > IB_QPT_GSI)))
 999                 return ERR_PTR(-EINVAL);
1000
1001         switch (init_attr->qp_type) {
1002         case IB_QPT_XRC_TGT:
1003                 pd = to_mxrcd(init_attr->xrcd)->pd;
1004                 xrcdn = to_mxrcd(init_attr->xrcd)->xrcdn;
1005                 init_attr->send_cq = to_mxrcd(init_attr->xrcd)->cq;
1006                 /* fall through */
1007         case IB_QPT_XRC_INI:
1008                 if (!(to_mdev(pd->device)->dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC))
1009                         return ERR_PTR(-ENOSYS);
1010                 init_attr->recv_cq = init_attr->send_cq;
1011                 /* fall through */
1012         case IB_QPT_RC:
1013         case IB_QPT_UC:
1014         case IB_QPT_RAW_PACKET:
1015                 qp = kzalloc(sizeof *qp, GFP_KERNEL);
1016                 if (!qp)
1017                         return ERR_PTR(-ENOMEM);
1018                 /* fall through */
1019         case IB_QPT_UD:
1020         {
1021                 err = create_qp_common(to_mdev(pd->device), pd, init_attr,
1022                                        udata, 0, &qp);
1023                 if (err)
1024                         return ERR_PTR(err);
1025
1026                 qp->ibqp.qp_num = qp->mqp.qpn;
1027                 qp->xrcdn = xrcdn;
1028
1029                 break;
1030         }
1031         case IB_QPT_SMI:
1032         case IB_QPT_GSI:
1033         {
1034                 /* Userspace is not allowed to create special QPs: */
1035                 if (udata)
1036                         return ERR_PTR(-EINVAL);
1037
1038                 err = create_qp_common(to_mdev(pd->device), pd, init_attr, udata,
1039                                        get_sqp_num(to_mdev(pd->device), init_attr),
1040                                        &qp);
1041                 if (err)
1042                         return ERR_PTR(err);
1043
1044                 qp->port        = init_attr->port_num;
1045                 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
1046
1047                 break;
1048         }
1049         default:
1050                 /* Don't support raw QPs */
1051                 return ERR_PTR(-EINVAL);
1052         }
1053
1054         return &qp->ibqp;
1055 }
1056
1057 int mlx4_ib_destroy_qp(struct ib_qp *qp)
1058 {
1059         struct mlx4_ib_dev *dev = to_mdev(qp->device);
1060         struct mlx4_ib_qp *mqp = to_mqp(qp);
1061         struct mlx4_ib_pd *pd;
1062
1063         if (is_qp0(dev, mqp))
1064                 mlx4_CLOSE_PORT(dev->dev, mqp->port);
1065
1066         pd = get_pd(mqp);
1067         destroy_qp_common(dev, mqp, !!pd->ibpd.uobject);
1068
1069         if (is_sqp(dev, mqp))
1070                 kfree(to_msqp(mqp));
1071         else
1072                 kfree(mqp);
1073
1074         return 0;
1075 }
1076
1077 static int to_mlx4_st(struct mlx4_ib_dev *dev, enum mlx4_ib_qp_type type)
1078 {
1079         switch (type) {
1080         case MLX4_IB_QPT_RC:            return MLX4_QP_ST_RC;
1081         case MLX4_IB_QPT_UC:            return MLX4_QP_ST_UC;
1082         case MLX4_IB_QPT_UD:            return MLX4_QP_ST_UD;
1083         case MLX4_IB_QPT_XRC_INI:
1084         case MLX4_IB_QPT_XRC_TGT:       return MLX4_QP_ST_XRC;
1085         case MLX4_IB_QPT_SMI:
1086         case MLX4_IB_QPT_GSI:
1087         case MLX4_IB_QPT_RAW_PACKET:    return MLX4_QP_ST_MLX;
1088
1089         case MLX4_IB_QPT_PROXY_SMI_OWNER:
1090         case MLX4_IB_QPT_TUN_SMI_OWNER: return (mlx4_is_mfunc(dev->dev) ?
1091                                                 MLX4_QP_ST_MLX : -1);
1092         case MLX4_IB_QPT_PROXY_SMI:
1093         case MLX4_IB_QPT_TUN_SMI:
1094         case MLX4_IB_QPT_PROXY_GSI:
1095         case MLX4_IB_QPT_TUN_GSI:       return (mlx4_is_mfunc(dev->dev) ?
1096                                                 MLX4_QP_ST_UD : -1);
1097         default:                        return -1;
1098         }
1099 }
1100
1101 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
1102                                    int attr_mask)
1103 {
1104         u8 dest_rd_atomic;
1105         u32 access_flags;
1106         u32 hw_access_flags = 0;
1107
1108         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
1109                 dest_rd_atomic = attr->max_dest_rd_atomic;
1110         else
1111                 dest_rd_atomic = qp->resp_depth;
1112
1113         if (attr_mask & IB_QP_ACCESS_FLAGS)
1114                 access_flags = attr->qp_access_flags;
1115         else
1116                 access_flags = qp->atomic_rd_en;
1117
1118         if (!dest_rd_atomic)
1119                 access_flags &= IB_ACCESS_REMOTE_WRITE;
1120
1121         if (access_flags & IB_ACCESS_REMOTE_READ)
1122                 hw_access_flags |= MLX4_QP_BIT_RRE;
1123         if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
1124                 hw_access_flags |= MLX4_QP_BIT_RAE;
1125         if (access_flags & IB_ACCESS_REMOTE_WRITE)
1126                 hw_access_flags |= MLX4_QP_BIT_RWE;
1127
1128         return cpu_to_be32(hw_access_flags);
1129 }
1130
1131 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
1132                             int attr_mask)
1133 {
1134         if (attr_mask & IB_QP_PKEY_INDEX)
1135                 sqp->pkey_index = attr->pkey_index;
1136         if (attr_mask & IB_QP_QKEY)
1137                 sqp->qkey = attr->qkey;
1138         if (attr_mask & IB_QP_SQ_PSN)
1139                 sqp->send_psn = attr->sq_psn;
1140 }
1141
1142 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
1143 {
1144         path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
1145 }
1146
1147 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
1148                          struct mlx4_qp_path *path, u8 port)
1149 {
1150         int err;
1151         int is_eth = rdma_port_get_link_layer(&dev->ib_dev, port) ==
1152                 IB_LINK_LAYER_ETHERNET;
1153         u8 mac[6];
1154         int is_mcast;
1155         u16 vlan_tag;
1156         int vidx;
1157
1158         path->grh_mylmc     = ah->src_path_bits & 0x7f;
1159         path->rlid          = cpu_to_be16(ah->dlid);
1160         if (ah->static_rate) {
1161                 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
1162                 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
1163                        !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
1164                         --path->static_rate;
1165         } else
1166                 path->static_rate = 0;
1167
1168         if (ah->ah_flags & IB_AH_GRH) {
1169                 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
1170                         pr_err("sgid_index (%u) too large. max is %d\n",
1171                                ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
1172                         return -1;
1173                 }
1174
1175                 path->grh_mylmc |= 1 << 7;
1176                 path->mgid_index = ah->grh.sgid_index;
1177                 path->hop_limit  = ah->grh.hop_limit;
1178                 path->tclass_flowlabel =
1179                         cpu_to_be32((ah->grh.traffic_class << 20) |
1180                                     (ah->grh.flow_label));
1181                 memcpy(path->rgid, ah->grh.dgid.raw, 16);
1182         }
1183
1184         if (is_eth) {
1185                 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
1186                         ((port - 1) << 6) | ((ah->sl & 7) << 3);
1187
1188                 if (!(ah->ah_flags & IB_AH_GRH))
1189                         return -1;
1190
1191                 err = mlx4_ib_resolve_grh(dev, ah, mac, &is_mcast, port);
1192                 if (err)
1193                         return err;
1194
1195                 memcpy(path->dmac, mac, 6);
1196                 path->ackto = MLX4_IB_LINK_TYPE_ETH;
1197                 /* use index 0 into MAC table for IBoE */
1198                 path->grh_mylmc &= 0x80;
1199
1200                 vlan_tag = rdma_get_vlan_id(&dev->iboe.gid_table[port - 1][ah->grh.sgid_index]);
1201                 if (vlan_tag < 0x1000) {
1202                         if (mlx4_find_cached_vlan(dev->dev, port, vlan_tag, &vidx))
1203                                 return -ENOENT;
1204
1205                         path->vlan_index = vidx;
1206                         path->fl = 1 << 6;
1207                 }
1208         } else
1209                 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
1210                         ((port - 1) << 6) | ((ah->sl & 0xf) << 2);
1211
1212         return 0;
1213 }
1214
1215 static void update_mcg_macs(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
1216 {
1217         struct mlx4_ib_gid_entry *ge, *tmp;
1218
1219         list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
1220                 if (!ge->added && mlx4_ib_add_mc(dev, qp, &ge->gid)) {
1221                         ge->added = 1;
1222                         ge->port = qp->port;
1223                 }
1224         }
1225 }
1226
1227 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
1228                                const struct ib_qp_attr *attr, int attr_mask,
1229                                enum ib_qp_state cur_state, enum ib_qp_state new_state)
1230 {
1231         struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1232         struct mlx4_ib_qp *qp = to_mqp(ibqp);
1233         struct mlx4_ib_pd *pd;
1234         struct mlx4_ib_cq *send_cq, *recv_cq;
1235         struct mlx4_qp_context *context;
1236         enum mlx4_qp_optpar optpar = 0;
1237         int sqd_event;
1238         int err = -EINVAL;
1239
1240         context = kzalloc(sizeof *context, GFP_KERNEL);
1241         if (!context)
1242                 return -ENOMEM;
1243
1244         context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
1245                                      (to_mlx4_st(dev, qp->mlx4_ib_qp_type) << 16));
1246
1247         if (!(attr_mask & IB_QP_PATH_MIG_STATE))
1248                 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
1249         else {
1250                 optpar |= MLX4_QP_OPTPAR_PM_STATE;
1251                 switch (attr->path_mig_state) {
1252                 case IB_MIG_MIGRATED:
1253                         context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
1254                         break;
1255                 case IB_MIG_REARM:
1256                         context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
1257                         break;
1258                 case IB_MIG_ARMED:
1259                         context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
1260                         break;
1261                 }
1262         }
1263
1264         if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI)
1265                 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
1266         else if (ibqp->qp_type == IB_QPT_RAW_PACKET)
1267                 context->mtu_msgmax = (MLX4_RAW_QP_MTU << 5) | MLX4_RAW_QP_MSGMAX;
1268         else if (ibqp->qp_type == IB_QPT_UD) {
1269                 if (qp->flags & MLX4_IB_QP_LSO)
1270                         context->mtu_msgmax = (IB_MTU_4096 << 5) |
1271                                               ilog2(dev->dev->caps.max_gso_sz);
1272                 else
1273                         context->mtu_msgmax = (IB_MTU_4096 << 5) | 12;
1274         } else if (attr_mask & IB_QP_PATH_MTU) {
1275                 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
1276                         pr_err("path MTU (%u) is invalid\n",
1277                                attr->path_mtu);
1278                         goto out;
1279                 }
1280                 context->mtu_msgmax = (attr->path_mtu << 5) |
1281                         ilog2(dev->dev->caps.max_msg_sz);
1282         }
1283
1284         if (qp->rq.wqe_cnt)
1285                 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
1286         context->rq_size_stride |= qp->rq.wqe_shift - 4;
1287
1288         if (qp->sq.wqe_cnt)
1289                 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
1290         context->sq_size_stride |= qp->sq.wqe_shift - 4;
1291
1292         if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1293                 context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
1294                 context->xrcd = cpu_to_be32((u32) qp->xrcdn);
1295         }
1296
1297         if (qp->ibqp.uobject)
1298                 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
1299         else
1300                 context->usr_page = cpu_to_be32(dev->priv_uar.index);
1301
1302         if (attr_mask & IB_QP_DEST_QPN)
1303                 context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
1304
1305         if (attr_mask & IB_QP_PORT) {
1306                 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
1307                     !(attr_mask & IB_QP_AV)) {
1308                         mlx4_set_sched(&context->pri_path, attr->port_num);
1309                         optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
1310                 }
1311         }
1312
1313         if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) {
1314                 if (dev->counters[qp->port - 1] != -1) {
1315                         context->pri_path.counter_index =
1316                                                 dev->counters[qp->port - 1];
1317                         optpar |= MLX4_QP_OPTPAR_COUNTER_INDEX;
1318                 } else
1319                         context->pri_path.counter_index = 0xff;
1320         }
1321
1322         if (attr_mask & IB_QP_PKEY_INDEX) {
1323                 if (qp->mlx4_ib_qp_type & MLX4_IB_QPT_ANY_SRIOV)
1324                         context->pri_path.disable_pkey_check = 0x40;
1325                 context->pri_path.pkey_index = attr->pkey_index;
1326                 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
1327         }
1328
1329         if (attr_mask & IB_QP_AV) {
1330                 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
1331                                   attr_mask & IB_QP_PORT ?
1332                                   attr->port_num : qp->port))
1333                         goto out;
1334
1335                 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
1336                            MLX4_QP_OPTPAR_SCHED_QUEUE);
1337         }
1338
1339         if (attr_mask & IB_QP_TIMEOUT) {
1340                 context->pri_path.ackto |= attr->timeout << 3;
1341                 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
1342         }
1343
1344         if (attr_mask & IB_QP_ALT_PATH) {
1345                 if (attr->alt_port_num == 0 ||
1346                     attr->alt_port_num > dev->dev->caps.num_ports)
1347                         goto out;
1348
1349                 if (attr->alt_pkey_index >=
1350                     dev->dev->caps.pkey_table_len[attr->alt_port_num])
1351                         goto out;
1352
1353                 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
1354                                   attr->alt_port_num))
1355                         goto out;
1356
1357                 context->alt_path.pkey_index = attr->alt_pkey_index;
1358                 context->alt_path.ackto = attr->alt_timeout << 3;
1359                 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
1360         }
1361
1362         pd = get_pd(qp);
1363         get_cqs(qp, &send_cq, &recv_cq);
1364         context->pd       = cpu_to_be32(pd->pdn);
1365         context->cqn_send = cpu_to_be32(send_cq->mcq.cqn);
1366         context->cqn_recv = cpu_to_be32(recv_cq->mcq.cqn);
1367         context->params1  = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
1368
1369         /* Set "fast registration enabled" for all kernel QPs */
1370         if (!qp->ibqp.uobject)
1371                 context->params1 |= cpu_to_be32(1 << 11);
1372
1373         if (attr_mask & IB_QP_RNR_RETRY) {
1374                 context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
1375                 optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
1376         }
1377
1378         if (attr_mask & IB_QP_RETRY_CNT) {
1379                 context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
1380                 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
1381         }
1382
1383         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
1384                 if (attr->max_rd_atomic)
1385                         context->params1 |=
1386                                 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
1387                 optpar |= MLX4_QP_OPTPAR_SRA_MAX;
1388         }
1389
1390         if (attr_mask & IB_QP_SQ_PSN)
1391                 context->next_send_psn = cpu_to_be32(attr->sq_psn);
1392
1393         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
1394                 if (attr->max_dest_rd_atomic)
1395                         context->params2 |=
1396                                 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
1397                 optpar |= MLX4_QP_OPTPAR_RRA_MAX;
1398         }
1399
1400         if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
1401                 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
1402                 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
1403         }
1404
1405         if (ibqp->srq)
1406                 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
1407
1408         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
1409                 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
1410                 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
1411         }
1412         if (attr_mask & IB_QP_RQ_PSN)
1413                 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
1414
1415         /* proxy and tunnel qp qkeys will be changed in modify-qp wrappers */
1416         if (attr_mask & IB_QP_QKEY) {
1417                 if (qp->mlx4_ib_qp_type &
1418                     (MLX4_IB_QPT_PROXY_SMI_OWNER | MLX4_IB_QPT_TUN_SMI_OWNER))
1419                         context->qkey = cpu_to_be32(IB_QP_SET_QKEY);
1420                 else {
1421                         if (mlx4_is_mfunc(dev->dev) &&
1422                             !(qp->mlx4_ib_qp_type & MLX4_IB_QPT_ANY_SRIOV) &&
1423                             (attr->qkey & MLX4_RESERVED_QKEY_MASK) ==
1424                             MLX4_RESERVED_QKEY_BASE) {
1425                                 pr_err("Cannot use reserved QKEY"
1426                                        " 0x%x (range 0xffff0000..0xffffffff"
1427                                        " is reserved)\n", attr->qkey);
1428                                 err = -EINVAL;
1429                                 goto out;
1430                         }
1431                         context->qkey = cpu_to_be32(attr->qkey);
1432                 }
1433                 optpar |= MLX4_QP_OPTPAR_Q_KEY;
1434         }
1435
1436         if (ibqp->srq)
1437                 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
1438
1439         if (qp->rq.wqe_cnt && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1440                 context->db_rec_addr = cpu_to_be64(qp->db.dma);
1441
1442         if (cur_state == IB_QPS_INIT &&
1443             new_state == IB_QPS_RTR  &&
1444             (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
1445              ibqp->qp_type == IB_QPT_UD ||
1446              ibqp->qp_type == IB_QPT_RAW_PACKET)) {
1447                 context->pri_path.sched_queue = (qp->port - 1) << 6;
1448                 if (qp->mlx4_ib_qp_type == MLX4_IB_QPT_SMI ||
1449                     qp->mlx4_ib_qp_type &
1450                     (MLX4_IB_QPT_PROXY_SMI_OWNER | MLX4_IB_QPT_TUN_SMI_OWNER)) {
1451                         context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
1452                         if (qp->mlx4_ib_qp_type != MLX4_IB_QPT_SMI)
1453                                 context->pri_path.fl = 0x80;
1454                 } else {
1455                         if (qp->mlx4_ib_qp_type & MLX4_IB_QPT_ANY_SRIOV)
1456                                 context->pri_path.fl = 0x80;
1457                         context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
1458                 }
1459         }
1460
1461         if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD  &&
1462             attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
1463                 sqd_event = 1;
1464         else
1465                 sqd_event = 0;
1466
1467         if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1468                 context->rlkey |= (1 << 4);
1469
1470         /*
1471          * Before passing a kernel QP to the HW, make sure that the
1472          * ownership bits of the send queue are set and the SQ
1473          * headroom is stamped so that the hardware doesn't start
1474          * processing stale work requests.
1475          */
1476         if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1477                 struct mlx4_wqe_ctrl_seg *ctrl;
1478                 int i;
1479
1480                 for (i = 0; i < qp->sq.wqe_cnt; ++i) {
1481                         ctrl = get_send_wqe(qp, i);
1482                         ctrl->owner_opcode = cpu_to_be32(1 << 31);
1483                         if (qp->sq_max_wqes_per_wr == 1)
1484                                 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4);
1485
1486                         stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift);
1487                 }
1488         }
1489
1490         err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
1491                              to_mlx4_state(new_state), context, optpar,
1492                              sqd_event, &qp->mqp);
1493         if (err)
1494                 goto out;
1495
1496         qp->state = new_state;
1497
1498         if (attr_mask & IB_QP_ACCESS_FLAGS)
1499                 qp->atomic_rd_en = attr->qp_access_flags;
1500         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
1501                 qp->resp_depth = attr->max_dest_rd_atomic;
1502         if (attr_mask & IB_QP_PORT) {
1503                 qp->port = attr->port_num;
1504                 update_mcg_macs(dev, qp);
1505         }
1506         if (attr_mask & IB_QP_ALT_PATH)
1507                 qp->alt_port = attr->alt_port_num;
1508
1509         if (is_sqp(dev, qp))
1510                 store_sqp_attrs(to_msqp(qp), attr, attr_mask);
1511
1512         /*
1513          * If we moved QP0 to RTR, bring the IB link up; if we moved
1514          * QP0 to RESET or ERROR, bring the link back down.
1515          */
1516         if (is_qp0(dev, qp)) {
1517                 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
1518                         if (mlx4_INIT_PORT(dev->dev, qp->port))
1519                                 pr_warn("INIT_PORT failed for port %d\n",
1520                                        qp->port);
1521
1522                 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
1523                     (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
1524                         mlx4_CLOSE_PORT(dev->dev, qp->port);
1525         }
1526
1527         /*
1528          * If we moved a kernel QP to RESET, clean up all old CQ
1529          * entries and reinitialize the QP.
1530          */
1531         if (new_state == IB_QPS_RESET && !ibqp->uobject) {
1532                 mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
1533                                  ibqp->srq ? to_msrq(ibqp->srq): NULL);
1534                 if (send_cq != recv_cq)
1535                         mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
1536
1537                 qp->rq.head = 0;
1538                 qp->rq.tail = 0;
1539                 qp->sq.head = 0;
1540                 qp->sq.tail = 0;
1541                 qp->sq_next_wqe = 0;
1542                 if (qp->rq.wqe_cnt)
1543                         *qp->db.db  = 0;
1544         }
1545
1546 out:
1547         kfree(context);
1548         return err;
1549 }
1550
1551 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
1552                       int attr_mask, struct ib_udata *udata)
1553 {
1554         struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1555         struct mlx4_ib_qp *qp = to_mqp(ibqp);
1556         enum ib_qp_state cur_state, new_state;
1557         int err = -EINVAL;
1558
1559         mutex_lock(&qp->mutex);
1560
1561         cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
1562         new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
1563
1564         if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) {
1565                 pr_debug("qpn 0x%x: invalid attribute mask specified "
1566                          "for transition %d to %d. qp_type %d,"
1567                          " attr_mask 0x%x\n",
1568                          ibqp->qp_num, cur_state, new_state,
1569                          ibqp->qp_type, attr_mask);
1570                 goto out;
1571         }
1572
1573         if ((attr_mask & IB_QP_PORT) &&
1574             (attr->port_num == 0 || attr->port_num > dev->num_ports)) {
1575                 pr_debug("qpn 0x%x: invalid port number (%d) specified "
1576                          "for transition %d to %d. qp_type %d\n",
1577                          ibqp->qp_num, attr->port_num, cur_state,
1578                          new_state, ibqp->qp_type);
1579                 goto out;
1580         }
1581
1582         if ((attr_mask & IB_QP_PORT) && (ibqp->qp_type == IB_QPT_RAW_PACKET) &&
1583             (rdma_port_get_link_layer(&dev->ib_dev, attr->port_num) !=
1584              IB_LINK_LAYER_ETHERNET))
1585                 goto out;
1586
1587         if (attr_mask & IB_QP_PKEY_INDEX) {
1588                 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
1589                 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p]) {
1590                         pr_debug("qpn 0x%x: invalid pkey index (%d) specified "
1591                                  "for transition %d to %d. qp_type %d\n",
1592                                  ibqp->qp_num, attr->pkey_index, cur_state,
1593                                  new_state, ibqp->qp_type);
1594                         goto out;
1595                 }
1596         }
1597
1598         if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
1599             attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
1600                 pr_debug("qpn 0x%x: max_rd_atomic (%d) too large. "
1601                          "Transition %d to %d. qp_type %d\n",
1602                          ibqp->qp_num, attr->max_rd_atomic, cur_state,
1603                          new_state, ibqp->qp_type);
1604                 goto out;
1605         }
1606
1607         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
1608             attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
1609                 pr_debug("qpn 0x%x: max_dest_rd_atomic (%d) too large. "
1610                          "Transition %d to %d. qp_type %d\n",
1611                          ibqp->qp_num, attr->max_dest_rd_atomic, cur_state,
1612                          new_state, ibqp->qp_type);
1613                 goto out;
1614         }
1615
1616         if (cur_state == new_state && cur_state == IB_QPS_RESET) {
1617                 err = 0;
1618                 goto out;
1619         }
1620
1621         err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
1622
1623 out:
1624         mutex_unlock(&qp->mutex);
1625         return err;
1626 }
1627
1628 static int build_sriov_qp0_header(struct mlx4_ib_sqp *sqp,
1629                                   struct ib_send_wr *wr,
1630                                   void *wqe, unsigned *mlx_seg_len)
1631 {
1632         struct mlx4_ib_dev *mdev = to_mdev(sqp->qp.ibqp.device);
1633         struct ib_device *ib_dev = &mdev->ib_dev;
1634         struct mlx4_wqe_mlx_seg *mlx = wqe;
1635         struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1636         struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1637         u16 pkey;
1638         u32 qkey;
1639         int send_size;
1640         int header_size;
1641         int spc;
1642         int i;
1643
1644         if (wr->opcode != IB_WR_SEND)
1645                 return -EINVAL;
1646
1647         send_size = 0;
1648
1649         for (i = 0; i < wr->num_sge; ++i)
1650                 send_size += wr->sg_list[i].length;
1651
1652         /* for proxy-qp0 sends, need to add in size of tunnel header */
1653         /* for tunnel-qp0 sends, tunnel header is already in s/g list */
1654         if (sqp->qp.mlx4_ib_qp_type == MLX4_IB_QPT_PROXY_SMI_OWNER)
1655                 send_size += sizeof (struct mlx4_ib_tunnel_header);
1656
1657         ib_ud_header_init(send_size, 1, 0, 0, 0, 0, &sqp->ud_header);
1658
1659         if (sqp->qp.mlx4_ib_qp_type == MLX4_IB_QPT_PROXY_SMI_OWNER) {
1660                 sqp->ud_header.lrh.service_level =
1661                         be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
1662                 sqp->ud_header.lrh.destination_lid =
1663                         cpu_to_be16(ah->av.ib.g_slid & 0x7f);
1664                 sqp->ud_header.lrh.source_lid =
1665                         cpu_to_be16(ah->av.ib.g_slid & 0x7f);
1666         }
1667
1668         mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1669
1670         /* force loopback */
1671         mlx->flags |= cpu_to_be32(MLX4_WQE_MLX_VL15 | 0x1 | MLX4_WQE_MLX_SLR);
1672         mlx->rlid = sqp->ud_header.lrh.destination_lid;
1673
1674         sqp->ud_header.lrh.virtual_lane    = 0;
1675         sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1676         ib_get_cached_pkey(ib_dev, sqp->qp.port, 0, &pkey);
1677         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1678         if (sqp->qp.mlx4_ib_qp_type == MLX4_IB_QPT_TUN_SMI_OWNER)
1679                 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1680         else
1681                 sqp->ud_header.bth.destination_qpn =
1682                         cpu_to_be32(mdev->dev->caps.qp0_tunnel[sqp->qp.port - 1]);
1683
1684         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1685         if (mlx4_get_parav_qkey(mdev->dev, sqp->qp.mqp.qpn, &qkey))
1686                 return -EINVAL;
1687         sqp->ud_header.deth.qkey = cpu_to_be32(qkey);
1688         sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.mqp.qpn);
1689
1690         sqp->ud_header.bth.opcode        = IB_OPCODE_UD_SEND_ONLY;
1691         sqp->ud_header.immediate_present = 0;
1692
1693         header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1694
1695         /*
1696          * Inline data segments may not cross a 64 byte boundary.  If
1697          * our UD header is bigger than the space available up to the
1698          * next 64 byte boundary in the WQE, use two inline data
1699          * segments to hold the UD header.
1700          */
1701         spc = MLX4_INLINE_ALIGN -
1702               ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1703         if (header_size <= spc) {
1704                 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1705                 memcpy(inl + 1, sqp->header_buf, header_size);
1706                 i = 1;
1707         } else {
1708                 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1709                 memcpy(inl + 1, sqp->header_buf, spc);
1710
1711                 inl = (void *) (inl + 1) + spc;
1712                 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1713                 /*
1714                  * Need a barrier here to make sure all the data is
1715                  * visible before the byte_count field is set.
1716                  * Otherwise the HCA prefetcher could grab the 64-byte
1717                  * chunk with this inline segment and get a valid (!=
1718                  * 0xffffffff) byte count but stale data, and end up
1719                  * generating a packet with bad headers.
1720                  *
1721                  * The first inline segment's byte_count field doesn't
1722                  * need a barrier, because it comes after a
1723                  * control/MLX segment and therefore is at an offset
1724                  * of 16 mod 64.
1725                  */
1726                 wmb();
1727                 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1728                 i = 2;
1729         }
1730
1731         *mlx_seg_len =
1732         ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1733         return 0;
1734 }
1735
1736 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
1737                             void *wqe, unsigned *mlx_seg_len)
1738 {
1739         struct ib_device *ib_dev = sqp->qp.ibqp.device;
1740         struct mlx4_wqe_mlx_seg *mlx = wqe;
1741         struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1742         struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1743         struct net_device *ndev;
1744         union ib_gid sgid;
1745         u16 pkey;
1746         int send_size;
1747         int header_size;
1748         int spc;
1749         int i;
1750         int err = 0;
1751         u16 vlan = 0xffff;
1752         bool is_eth;
1753         bool is_vlan = false;
1754         bool is_grh;
1755
1756         send_size = 0;
1757         for (i = 0; i < wr->num_sge; ++i)
1758                 send_size += wr->sg_list[i].length;
1759
1760         is_eth = rdma_port_get_link_layer(sqp->qp.ibqp.device, sqp->qp.port) == IB_LINK_LAYER_ETHERNET;
1761         is_grh = mlx4_ib_ah_grh_present(ah);
1762         if (is_eth) {
1763                 if (mlx4_is_mfunc(to_mdev(ib_dev)->dev)) {
1764                         /* When multi-function is enabled, the ib_core gid
1765                          * indexes don't necessarily match the hw ones, so
1766                          * we must use our own cache */
1767                         sgid.global.subnet_prefix =
1768                                 to_mdev(ib_dev)->sriov.demux[sqp->qp.port - 1].
1769                                 subnet_prefix;
1770                         sgid.global.interface_id =
1771                                 to_mdev(ib_dev)->sriov.demux[sqp->qp.port - 1].
1772                                 guid_cache[ah->av.ib.gid_index];
1773                 } else  {
1774                         err = ib_get_cached_gid(ib_dev,
1775                                                 be32_to_cpu(ah->av.ib.port_pd) >> 24,
1776                                                 ah->av.ib.gid_index, &sgid);
1777                         if (err)
1778                                 return err;
1779                 }
1780
1781                 vlan = rdma_get_vlan_id(&sgid);
1782                 is_vlan = vlan < 0x1000;
1783         }
1784         ib_ud_header_init(send_size, !is_eth, is_eth, is_vlan, is_grh, 0, &sqp->ud_header);
1785
1786         if (!is_eth) {
1787                 sqp->ud_header.lrh.service_level =
1788                         be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
1789                 sqp->ud_header.lrh.destination_lid = ah->av.ib.dlid;
1790                 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.ib.g_slid & 0x7f);
1791         }
1792
1793         if (is_grh) {
1794                 sqp->ud_header.grh.traffic_class =
1795                         (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20) & 0xff;
1796                 sqp->ud_header.grh.flow_label    =
1797                         ah->av.ib.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
1798                 sqp->ud_header.grh.hop_limit     = ah->av.ib.hop_limit;
1799                 if (mlx4_is_mfunc(to_mdev(ib_dev)->dev)) {
1800                         /* When multi-function is enabled, the ib_core gid
1801                          * indexes don't necessarily match the hw ones, so
1802                          * we must use our own cache */
1803                         sqp->ud_header.grh.source_gid.global.subnet_prefix =
1804                                 to_mdev(ib_dev)->sriov.demux[sqp->qp.port - 1].
1805                                                        subnet_prefix;
1806                         sqp->ud_header.grh.source_gid.global.interface_id =
1807                                 to_mdev(ib_dev)->sriov.demux[sqp->qp.port - 1].
1808                                                guid_cache[ah->av.ib.gid_index];
1809                 } else
1810                         ib_get_cached_gid(ib_dev,
1811                                           be32_to_cpu(ah->av.ib.port_pd) >> 24,
1812                                           ah->av.ib.gid_index,
1813                                           &sqp->ud_header.grh.source_gid);
1814                 memcpy(sqp->ud_header.grh.destination_gid.raw,
1815                        ah->av.ib.dgid, 16);
1816         }
1817
1818         mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1819
1820         if (!is_eth) {
1821                 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
1822                                           (sqp->ud_header.lrh.destination_lid ==
1823                                            IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
1824                                           (sqp->ud_header.lrh.service_level << 8));
1825                 if (ah->av.ib.port_pd & cpu_to_be32(0x80000000))
1826                         mlx->flags |= cpu_to_be32(0x1); /* force loopback */
1827                 mlx->rlid = sqp->ud_header.lrh.destination_lid;
1828         }
1829
1830         switch (wr->opcode) {
1831         case IB_WR_SEND:
1832                 sqp->ud_header.bth.opcode        = IB_OPCODE_UD_SEND_ONLY;
1833                 sqp->ud_header.immediate_present = 0;
1834                 break;
1835         case IB_WR_SEND_WITH_IMM:
1836                 sqp->ud_header.bth.opcode        = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1837                 sqp->ud_header.immediate_present = 1;
1838                 sqp->ud_header.immediate_data    = wr->ex.imm_data;
1839                 break;
1840         default:
1841                 return -EINVAL;
1842         }
1843
1844         if (is_eth) {
1845                 u8 *smac;
1846                 u16 pcp = (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 29) << 13;
1847
1848                 mlx->sched_prio = cpu_to_be16(pcp);
1849
1850                 memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6);
1851                 /* FIXME: cache smac value? */
1852                 ndev = to_mdev(sqp->qp.ibqp.device)->iboe.netdevs[sqp->qp.port - 1];
1853                 if (!ndev)
1854                         return -ENODEV;
1855                 smac = ndev->dev_addr;
1856                 memcpy(sqp->ud_header.eth.smac_h, smac, 6);
1857                 if (!memcmp(sqp->ud_header.eth.smac_h, sqp->ud_header.eth.dmac_h, 6))
1858                         mlx->flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);
1859                 if (!is_vlan) {
1860                         sqp->ud_header.eth.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1861                 } else {
1862                         sqp->ud_header.vlan.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1863                         sqp->ud_header.vlan.tag = cpu_to_be16(vlan | pcp);
1864                 }
1865         } else {
1866                 sqp->ud_header.lrh.virtual_lane    = !sqp->qp.ibqp.qp_num ? 15 : 0;
1867                 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1868                         sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1869         }
1870         sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1871         if (!sqp->qp.ibqp.qp_num)
1872                 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
1873         else
1874                 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
1875         sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1876         sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1877         sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1878         sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1879                                                sqp->qkey : wr->wr.ud.remote_qkey);
1880         sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1881
1882         header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1883
1884         if (0) {
1885                 pr_err("built UD header of size %d:\n", header_size);
1886                 for (i = 0; i < header_size / 4; ++i) {
1887                         if (i % 8 == 0)
1888                                 pr_err("  [%02x] ", i * 4);
1889                         pr_cont(" %08x",
1890                                 be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
1891                         if ((i + 1) % 8 == 0)
1892                                 pr_cont("\n");
1893                 }
1894                 pr_err("\n");
1895         }
1896
1897         /*
1898          * Inline data segments may not cross a 64 byte boundary.  If
1899          * our UD header is bigger than the space available up to the
1900          * next 64 byte boundary in the WQE, use two inline data
1901          * segments to hold the UD header.
1902          */
1903         spc = MLX4_INLINE_ALIGN -
1904                 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1905         if (header_size <= spc) {
1906                 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1907                 memcpy(inl + 1, sqp->header_buf, header_size);
1908                 i = 1;
1909         } else {
1910                 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1911                 memcpy(inl + 1, sqp->header_buf, spc);
1912
1913                 inl = (void *) (inl + 1) + spc;
1914                 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1915                 /*
1916                  * Need a barrier here to make sure all the data is
1917                  * visible before the byte_count field is set.
1918                  * Otherwise the HCA prefetcher could grab the 64-byte
1919                  * chunk with this inline segment and get a valid (!=
1920                  * 0xffffffff) byte count but stale data, and end up
1921                  * generating a packet with bad headers.
1922                  *
1923                  * The first inline segment's byte_count field doesn't
1924                  * need a barrier, because it comes after a
1925                  * control/MLX segment and therefore is at an offset
1926                  * of 16 mod 64.
1927                  */
1928                 wmb();
1929                 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1930                 i = 2;
1931         }
1932
1933         *mlx_seg_len =
1934                 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1935         return 0;
1936 }
1937
1938 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
1939 {
1940         unsigned cur;
1941         struct mlx4_ib_cq *cq;
1942
1943         cur = wq->head - wq->tail;
1944         if (likely(cur + nreq < wq->max_post))
1945                 return 0;
1946
1947         cq = to_mcq(ib_cq);
1948         spin_lock(&cq->lock);
1949         cur = wq->head - wq->tail;
1950         spin_unlock(&cq->lock);
1951
1952         return cur + nreq >= wq->max_post;
1953 }
1954
1955 static __be32 convert_access(int acc)
1956 {
1957         return (acc & IB_ACCESS_REMOTE_ATOMIC ?
1958                 cpu_to_be32(MLX4_WQE_FMR_AND_BIND_PERM_ATOMIC)       : 0) |
1959                (acc & IB_ACCESS_REMOTE_WRITE  ?
1960                 cpu_to_be32(MLX4_WQE_FMR_AND_BIND_PERM_REMOTE_WRITE) : 0) |
1961                (acc & IB_ACCESS_REMOTE_READ   ?
1962                 cpu_to_be32(MLX4_WQE_FMR_AND_BIND_PERM_REMOTE_READ)  : 0) |
1963                (acc & IB_ACCESS_LOCAL_WRITE   ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE)  : 0) |
1964                 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ);
1965 }
1966
1967 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr)
1968 {
1969         struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list);
1970         int i;
1971
1972         for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i)
1973                 mfrpl->mapped_page_list[i] =
1974                         cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] |
1975                                     MLX4_MTT_FLAG_PRESENT);
1976
1977         fseg->flags             = convert_access(wr->wr.fast_reg.access_flags);
1978         fseg->mem_key           = cpu_to_be32(wr->wr.fast_reg.rkey);
1979         fseg->buf_list          = cpu_to_be64(mfrpl->map);
1980         fseg->start_addr        = cpu_to_be64(wr->wr.fast_reg.iova_start);
1981         fseg->reg_len           = cpu_to_be64(wr->wr.fast_reg.length);
1982         fseg->offset            = 0; /* XXX -- is this just for ZBVA? */
1983         fseg->page_size         = cpu_to_be32(wr->wr.fast_reg.page_shift);
1984         fseg->reserved[0]       = 0;
1985         fseg->reserved[1]       = 0;
1986 }
1987
1988 static void set_bind_seg(struct mlx4_wqe_bind_seg *bseg, struct ib_send_wr *wr)
1989 {
1990         bseg->flags1 =
1991                 convert_access(wr->wr.bind_mw.bind_info.mw_access_flags) &
1992                 cpu_to_be32(MLX4_WQE_FMR_AND_BIND_PERM_REMOTE_READ  |
1993                             MLX4_WQE_FMR_AND_BIND_PERM_REMOTE_WRITE |
1994                             MLX4_WQE_FMR_AND_BIND_PERM_ATOMIC);
1995         bseg->flags2 = 0;
1996         if (wr->wr.bind_mw.mw->type == IB_MW_TYPE_2)
1997                 bseg->flags2 |= cpu_to_be32(MLX4_WQE_BIND_TYPE_2);
1998         if (wr->wr.bind_mw.bind_info.mw_access_flags & IB_ZERO_BASED)
1999                 bseg->flags2 |= cpu_to_be32(MLX4_WQE_BIND_ZERO_BASED);
2000         bseg->new_rkey = cpu_to_be32(wr->wr.bind_mw.rkey);
2001         bseg->lkey = cpu_to_be32(wr->wr.bind_mw.bind_info.mr->lkey);
2002         bseg->addr = cpu_to_be64(wr->wr.bind_mw.bind_info.addr);
2003         bseg->length = cpu_to_be64(wr->wr.bind_mw.bind_info.length);
2004 }
2005
2006 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey)
2007 {
2008         memset(iseg, 0, sizeof(*iseg));
2009         iseg->mem_key = cpu_to_be32(rkey);
2010 }
2011
2012 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,
2013                                           u64 remote_addr, u32 rkey)
2014 {
2015         rseg->raddr    = cpu_to_be64(remote_addr);
2016         rseg->rkey     = cpu_to_be32(rkey);
2017         rseg->reserved = 0;
2018 }
2019
2020 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr)
2021 {
2022         if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
2023                 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
2024                 aseg->compare  = cpu_to_be64(wr->wr.atomic.compare_add);
2025         } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) {
2026                 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
2027                 aseg->compare  = cpu_to_be64(wr->wr.atomic.compare_add_mask);
2028         } else {
2029                 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
2030                 aseg->compare  = 0;
2031         }
2032
2033 }
2034
2035 static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg,
2036                                   struct ib_send_wr *wr)
2037 {
2038         aseg->swap_add          = cpu_to_be64(wr->wr.atomic.swap);
2039         aseg->swap_add_mask     = cpu_to_be64(wr->wr.atomic.swap_mask);
2040         aseg->compare           = cpu_to_be64(wr->wr.atomic.compare_add);
2041         aseg->compare_mask      = cpu_to_be64(wr->wr.atomic.compare_add_mask);
2042 }
2043
2044 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
2045                              struct ib_send_wr *wr)
2046 {
2047         memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
2048         dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn);
2049         dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey);
2050         dseg->vlan = to_mah(wr->wr.ud.ah)->av.eth.vlan;
2051         memcpy(dseg->mac, to_mah(wr->wr.ud.ah)->av.eth.mac, 6);
2052 }
2053
2054 static void set_tunnel_datagram_seg(struct mlx4_ib_dev *dev,
2055                                     struct mlx4_wqe_datagram_seg *dseg,
2056                                     struct ib_send_wr *wr, enum ib_qp_type qpt)
2057 {
2058         union mlx4_ext_av *av = &to_mah(wr->wr.ud.ah)->av;
2059         struct mlx4_av sqp_av = {0};
2060         int port = *((u8 *) &av->ib.port_pd) & 0x3;
2061
2062         /* force loopback */
2063         sqp_av.port_pd = av->ib.port_pd | cpu_to_be32(0x80000000);
2064         sqp_av.g_slid = av->ib.g_slid & 0x7f; /* no GRH */
2065         sqp_av.sl_tclass_flowlabel = av->ib.sl_tclass_flowlabel &
2066                         cpu_to_be32(0xf0000000);
2067
2068         memcpy(dseg->av, &sqp_av, sizeof (struct mlx4_av));
2069         /* This function used only for sending on QP1 proxies */
2070         dseg->dqpn = cpu_to_be32(dev->dev->caps.qp1_tunnel[port - 1]);
2071         /* Use QKEY from the QP context, which is set by master */
2072         dseg->qkey = cpu_to_be32(IB_QP_SET_QKEY);
2073 }
2074
2075 static void build_tunnel_header(struct ib_send_wr *wr, void *wqe, unsigned *mlx_seg_len)
2076 {
2077         struct mlx4_wqe_inline_seg *inl = wqe;
2078         struct mlx4_ib_tunnel_header hdr;
2079         struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
2080         int spc;
2081         int i;
2082
2083         memcpy(&hdr.av, &ah->av, sizeof hdr.av);
2084         hdr.remote_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
2085         hdr.pkey_index = cpu_to_be16(wr->wr.ud.pkey_index);
2086         hdr.qkey = cpu_to_be32(wr->wr.ud.remote_qkey);
2087
2088         spc = MLX4_INLINE_ALIGN -
2089                 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
2090         if (sizeof (hdr) <= spc) {
2091                 memcpy(inl + 1, &hdr, sizeof (hdr));
2092                 wmb();
2093                 inl->byte_count = cpu_to_be32(1 << 31 | sizeof (hdr));
2094                 i = 1;
2095         } else {
2096                 memcpy(inl + 1, &hdr, spc);
2097                 wmb();
2098                 inl->byte_count = cpu_to_be32(1 << 31 | spc);
2099
2100                 inl = (void *) (inl + 1) + spc;
2101                 memcpy(inl + 1, (void *) &hdr + spc, sizeof (hdr) - spc);
2102                 wmb();
2103                 inl->byte_count = cpu_to_be32(1 << 31 | (sizeof (hdr) - spc));
2104                 i = 2;
2105         }
2106
2107         *mlx_seg_len =
2108                 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + sizeof (hdr), 16);
2109 }
2110
2111 static void set_mlx_icrc_seg(void *dseg)
2112 {
2113         u32 *t = dseg;
2114         struct mlx4_wqe_inline_seg *iseg = dseg;
2115
2116         t[1] = 0;
2117
2118         /*
2119          * Need a barrier here before writing the byte_count field to
2120          * make sure that all the data is visible before the
2121          * byte_count field is set.  Otherwise, if the segment begins
2122          * a new cacheline, the HCA prefetcher could grab the 64-byte
2123          * chunk and get a valid (!= * 0xffffffff) byte count but
2124          * stale data, and end up sending the wrong data.
2125          */
2126         wmb();
2127
2128         iseg->byte_count = cpu_to_be32((1 << 31) | 4);
2129 }
2130
2131 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
2132 {
2133         dseg->lkey       = cpu_to_be32(sg->lkey);
2134         dseg->addr       = cpu_to_be64(sg->addr);
2135
2136         /*
2137          * Need a barrier here before writing the byte_count field to
2138          * make sure that all the data is visible before the
2139          * byte_count field is set.  Otherwise, if the segment begins
2140          * a new cacheline, the HCA prefetcher could grab the 64-byte
2141          * chunk and get a valid (!= * 0xffffffff) byte count but
2142          * stale data, and end up sending the wrong data.
2143          */
2144         wmb();
2145
2146         dseg->byte_count = cpu_to_be32(sg->length);
2147 }
2148
2149 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
2150 {
2151         dseg->byte_count = cpu_to_be32(sg->length);
2152         dseg->lkey       = cpu_to_be32(sg->lkey);
2153         dseg->addr       = cpu_to_be64(sg->addr);
2154 }
2155
2156 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr,
2157                          struct mlx4_ib_qp *qp, unsigned *lso_seg_len,
2158                          __be32 *lso_hdr_sz, __be32 *blh)
2159 {
2160         unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16);
2161
2162         if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE))
2163                 *blh = cpu_to_be32(1 << 6);
2164
2165         if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) &&
2166                      wr->num_sge > qp->sq.max_gs - (halign >> 4)))
2167                 return -EINVAL;
2168
2169         memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen);
2170
2171         *lso_hdr_sz  = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 |
2172                                    wr->wr.ud.hlen);
2173         *lso_seg_len = halign;
2174         return 0;
2175 }
2176
2177 static __be32 send_ieth(struct ib_send_wr *wr)
2178 {
2179         switch (wr->opcode) {
2180         case IB_WR_SEND_WITH_IMM:
2181         case IB_WR_RDMA_WRITE_WITH_IMM:
2182                 return wr->ex.imm_data;
2183
2184         case IB_WR_SEND_WITH_INV:
2185                 return cpu_to_be32(wr->ex.invalidate_rkey);
2186
2187         default:
2188                 return 0;
2189         }
2190 }
2191
2192 static void add_zero_len_inline(void *wqe)
2193 {
2194         struct mlx4_wqe_inline_seg *inl = wqe;
2195         memset(wqe, 0, 16);
2196         inl->byte_count = cpu_to_be32(1 << 31);
2197 }
2198
2199 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
2200                       struct ib_send_wr **bad_wr)
2201 {
2202         struct mlx4_ib_qp *qp = to_mqp(ibqp);
2203         void *wqe;
2204         struct mlx4_wqe_ctrl_seg *ctrl;
2205         struct mlx4_wqe_data_seg *dseg;
2206         unsigned long flags;
2207         int nreq;
2208         int err = 0;
2209         unsigned ind;
2210         int uninitialized_var(stamp);
2211         int uninitialized_var(size);
2212         unsigned uninitialized_var(seglen);
2213         __be32 dummy;
2214         __be32 *lso_wqe;
2215         __be32 uninitialized_var(lso_hdr_sz);
2216         __be32 blh;
2217         int i;
2218
2219         spin_lock_irqsave(&qp->sq.lock, flags);
2220
2221         ind = qp->sq_next_wqe;
2222
2223         for (nreq = 0; wr; ++nreq, wr = wr->next) {
2224                 lso_wqe = &dummy;
2225                 blh = 0;
2226
2227                 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
2228                         err = -ENOMEM;
2229                         *bad_wr = wr;
2230                         goto out;
2231                 }
2232
2233                 if (unlikely(wr->num_sge > qp->sq.max_gs)) {
2234                         err = -EINVAL;
2235                         *bad_wr = wr;
2236                         goto out;
2237                 }
2238
2239                 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
2240                 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
2241
2242                 ctrl->srcrb_flags =
2243                         (wr->send_flags & IB_SEND_SIGNALED ?
2244                          cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
2245                         (wr->send_flags & IB_SEND_SOLICITED ?
2246                          cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
2247                         ((wr->send_flags & IB_SEND_IP_CSUM) ?
2248                          cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
2249                                      MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) |
2250                         qp->sq_signal_bits;
2251
2252                 ctrl->imm = send_ieth(wr);
2253
2254                 wqe += sizeof *ctrl;
2255                 size = sizeof *ctrl / 16;
2256
2257                 switch (qp->mlx4_ib_qp_type) {
2258                 case MLX4_IB_QPT_RC:
2259                 case MLX4_IB_QPT_UC:
2260                         switch (wr->opcode) {
2261                         case IB_WR_ATOMIC_CMP_AND_SWP:
2262                         case IB_WR_ATOMIC_FETCH_AND_ADD:
2263                         case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD:
2264                                 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
2265                                               wr->wr.atomic.rkey);
2266                                 wqe  += sizeof (struct mlx4_wqe_raddr_seg);
2267
2268                                 set_atomic_seg(wqe, wr);
2269                                 wqe  += sizeof (struct mlx4_wqe_atomic_seg);
2270
2271                                 size += (sizeof (struct mlx4_wqe_raddr_seg) +
2272                                          sizeof (struct mlx4_wqe_atomic_seg)) / 16;
2273
2274                                 break;
2275
2276                         case IB_WR_MASKED_ATOMIC_CMP_AND_SWP:
2277                                 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
2278                                               wr->wr.atomic.rkey);
2279                                 wqe  += sizeof (struct mlx4_wqe_raddr_seg);
2280
2281                                 set_masked_atomic_seg(wqe, wr);
2282                                 wqe  += sizeof (struct mlx4_wqe_masked_atomic_seg);
2283
2284                                 size += (sizeof (struct mlx4_wqe_raddr_seg) +
2285                                          sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16;
2286
2287                                 break;
2288
2289                         case IB_WR_RDMA_READ:
2290                         case IB_WR_RDMA_WRITE:
2291                         case IB_WR_RDMA_WRITE_WITH_IMM:
2292                                 set_raddr_seg(wqe, wr->wr.rdma.remote_addr,
2293                                               wr->wr.rdma.rkey);
2294                                 wqe  += sizeof (struct mlx4_wqe_raddr_seg);
2295                                 size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
2296                                 break;
2297
2298                         case IB_WR_LOCAL_INV:
2299                                 ctrl->srcrb_flags |=
2300                                         cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
2301                                 set_local_inv_seg(wqe, wr->ex.invalidate_rkey);
2302                                 wqe  += sizeof (struct mlx4_wqe_local_inval_seg);
2303                                 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16;
2304                                 break;
2305
2306                         case IB_WR_FAST_REG_MR:
2307                                 ctrl->srcrb_flags |=
2308                                         cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
2309                                 set_fmr_seg(wqe, wr);
2310                                 wqe  += sizeof (struct mlx4_wqe_fmr_seg);
2311                                 size += sizeof (struct mlx4_wqe_fmr_seg) / 16;
2312                                 break;
2313
2314                         case IB_WR_BIND_MW:
2315                                 ctrl->srcrb_flags |=
2316                                         cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
2317                                 set_bind_seg(wqe, wr);
2318                                 wqe  += sizeof(struct mlx4_wqe_bind_seg);
2319                                 size += sizeof(struct mlx4_wqe_bind_seg) / 16;
2320                                 break;
2321                         default:
2322                                 /* No extra segments required for sends */
2323                                 break;
2324                         }
2325                         break;
2326
2327                 case MLX4_IB_QPT_TUN_SMI_OWNER:
2328                         err =  build_sriov_qp0_header(to_msqp(qp), wr, ctrl, &seglen);
2329                         if (unlikely(err)) {
2330                                 *bad_wr = wr;
2331                                 goto out;
2332                         }
2333                         wqe  += seglen;
2334                         size += seglen / 16;
2335                         break;
2336                 case MLX4_IB_QPT_TUN_SMI:
2337                 case MLX4_IB_QPT_TUN_GSI:
2338                         /* this is a UD qp used in MAD responses to slaves. */
2339                         set_datagram_seg(wqe, wr);
2340                         /* set the forced-loopback bit in the data seg av */
2341                         *(__be32 *) wqe |= cpu_to_be32(0x80000000);
2342                         wqe  += sizeof (struct mlx4_wqe_datagram_seg);
2343                         size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
2344                         break;
2345                 case MLX4_IB_QPT_UD:
2346                         set_datagram_seg(wqe, wr);
2347                         wqe  += sizeof (struct mlx4_wqe_datagram_seg);
2348                         size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
2349
2350                         if (wr->opcode == IB_WR_LSO) {
2351                                 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh);
2352                                 if (unlikely(err)) {
2353                                         *bad_wr = wr;
2354                                         goto out;
2355                                 }
2356                                 lso_wqe = (__be32 *) wqe;
2357                                 wqe  += seglen;
2358                                 size += seglen / 16;
2359                         }
2360                         break;
2361
2362                 case MLX4_IB_QPT_PROXY_SMI_OWNER:
2363                         if (unlikely(!mlx4_is_master(to_mdev(ibqp->device)->dev))) {
2364                                 err = -ENOSYS;
2365                                 *bad_wr = wr;
2366                                 goto out;
2367                         }
2368                         err = build_sriov_qp0_header(to_msqp(qp), wr, ctrl, &seglen);
2369                         if (unlikely(err)) {
2370                                 *bad_wr = wr;
2371                                 goto out;
2372                         }
2373                         wqe  += seglen;
2374                         size += seglen / 16;
2375                         /* to start tunnel header on a cache-line boundary */
2376                         add_zero_len_inline(wqe);
2377                         wqe += 16;
2378                         size++;
2379                         build_tunnel_header(wr, wqe, &seglen);
2380                         wqe  += seglen;
2381                         size += seglen / 16;
2382                         break;
2383                 case MLX4_IB_QPT_PROXY_SMI:
2384                         /* don't allow QP0 sends on guests */
2385                         err = -ENOSYS;
2386                         *bad_wr = wr;
2387                         goto out;
2388                 case MLX4_IB_QPT_PROXY_GSI:
2389                         /* If we are tunneling special qps, this is a UD qp.
2390                          * In this case we first add a UD segment targeting
2391                          * the tunnel qp, and then add a header with address
2392                          * information */
2393                         set_tunnel_datagram_seg(to_mdev(ibqp->device), wqe, wr, ibqp->qp_type);
2394                         wqe  += sizeof (struct mlx4_wqe_datagram_seg);
2395                         size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
2396                         build_tunnel_header(wr, wqe, &seglen);
2397                         wqe  += seglen;
2398                         size += seglen / 16;
2399                         break;
2400
2401                 case MLX4_IB_QPT_SMI:
2402                 case MLX4_IB_QPT_GSI:
2403                         err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen);
2404                         if (unlikely(err)) {
2405                                 *bad_wr = wr;
2406                                 goto out;
2407                         }
2408                         wqe  += seglen;
2409                         size += seglen / 16;
2410                         break;
2411
2412                 default:
2413                         break;
2414                 }
2415
2416                 /*
2417                  * Write data segments in reverse order, so as to
2418                  * overwrite cacheline stamp last within each
2419                  * cacheline.  This avoids issues with WQE
2420                  * prefetching.
2421                  */
2422
2423                 dseg = wqe;
2424                 dseg += wr->num_sge - 1;
2425                 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16);
2426
2427                 /* Add one more inline data segment for ICRC for MLX sends */
2428                 if (unlikely(qp->mlx4_ib_qp_type == MLX4_IB_QPT_SMI ||
2429                              qp->mlx4_ib_qp_type == MLX4_IB_QPT_GSI ||
2430                              qp->mlx4_ib_qp_type &
2431                              (MLX4_IB_QPT_PROXY_SMI_OWNER | MLX4_IB_QPT_TUN_SMI_OWNER))) {
2432                         set_mlx_icrc_seg(dseg + 1);
2433                         size += sizeof (struct mlx4_wqe_data_seg) / 16;
2434                 }
2435
2436                 for (i = wr->num_sge - 1; i >= 0; --i, --dseg)
2437                         set_data_seg(dseg, wr->sg_list + i);
2438
2439                 /*
2440                  * Possibly overwrite stamping in cacheline with LSO
2441                  * segment only after making sure all data segments
2442                  * are written.
2443                  */
2444                 wmb();
2445                 *lso_wqe = lso_hdr_sz;
2446
2447                 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
2448                                     MLX4_WQE_CTRL_FENCE : 0) | size;
2449
2450                 /*
2451                  * Make sure descriptor is fully written before
2452                  * setting ownership bit (because HW can start
2453                  * executing as soon as we do).
2454                  */
2455                 wmb();
2456
2457                 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
2458                         *bad_wr = wr;
2459                         err = -EINVAL;
2460                         goto out;
2461                 }
2462
2463                 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
2464                         (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh;
2465
2466                 stamp = ind + qp->sq_spare_wqes;
2467                 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift);
2468
2469                 /*
2470                  * We can improve latency by not stamping the last
2471                  * send queue WQE until after ringing the doorbell, so
2472                  * only stamp here if there are still more WQEs to post.
2473                  *
2474                  * Same optimization applies to padding with NOP wqe
2475                  * in case of WQE shrinking (used to prevent wrap-around
2476                  * in the middle of WR).
2477                  */
2478                 if (wr->next) {
2479                         stamp_send_wqe(qp, stamp, size * 16);
2480                         ind = pad_wraparound(qp, ind);
2481                 }
2482         }
2483
2484 out:
2485         if (likely(nreq)) {
2486                 qp->sq.head += nreq;
2487
2488                 /*
2489                  * Make sure that descriptors are written before
2490                  * doorbell record.
2491                  */
2492                 wmb();
2493
2494                 writel(qp->doorbell_qpn,
2495                        to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
2496
2497                 /*
2498                  * Make sure doorbells don't leak out of SQ spinlock
2499                  * and reach the HCA out of order.
2500                  */
2501                 mmiowb();
2502
2503                 stamp_send_wqe(qp, stamp, size * 16);
2504
2505                 ind = pad_wraparound(qp, ind);
2506                 qp->sq_next_wqe = ind;
2507         }
2508
2509         spin_unlock_irqrestore(&qp->sq.lock, flags);
2510
2511         return err;
2512 }
2513
2514 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
2515                       struct ib_recv_wr **bad_wr)
2516 {
2517         struct mlx4_ib_qp *qp = to_mqp(ibqp);
2518         struct mlx4_wqe_data_seg *scat;
2519         unsigned long flags;
2520         int err = 0;
2521         int nreq;
2522         int ind;
2523         int max_gs;
2524         int i;
2525
2526         max_gs = qp->rq.max_gs;
2527         spin_lock_irqsave(&qp->rq.lock, flags);
2528
2529         ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
2530
2531         for (nreq = 0; wr; ++nreq, wr = wr->next) {
2532                 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
2533                         err = -ENOMEM;
2534                         *bad_wr = wr;
2535                         goto out;
2536                 }
2537
2538                 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
2539                         err = -EINVAL;
2540                         *bad_wr = wr;
2541                         goto out;
2542                 }
2543
2544                 scat = get_recv_wqe(qp, ind);
2545
2546                 if (qp->mlx4_ib_qp_type & (MLX4_IB_QPT_PROXY_SMI_OWNER |
2547                     MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI)) {
2548                         ib_dma_sync_single_for_device(ibqp->device,
2549                                                       qp->sqp_proxy_rcv[ind].map,
2550                                                       sizeof (struct mlx4_ib_proxy_sqp_hdr),
2551                                                       DMA_FROM_DEVICE);
2552                         scat->byte_count =
2553                                 cpu_to_be32(sizeof (struct mlx4_ib_proxy_sqp_hdr));
2554                         /* use dma lkey from upper layer entry */
2555                         scat->lkey = cpu_to_be32(wr->sg_list->lkey);
2556                         scat->addr = cpu_to_be64(qp->sqp_proxy_rcv[ind].map);
2557                         scat++;
2558                         max_gs--;
2559                 }
2560
2561                 for (i = 0; i < wr->num_sge; ++i)
2562                         __set_data_seg(scat + i, wr->sg_list + i);
2563
2564                 if (i < max_gs) {
2565                         scat[i].byte_count = 0;
2566                         scat[i].lkey       = cpu_to_be32(MLX4_INVALID_LKEY);
2567                         scat[i].addr       = 0;
2568                 }
2569
2570                 qp->rq.wrid[ind] = wr->wr_id;
2571
2572                 ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
2573         }
2574
2575 out:
2576         if (likely(nreq)) {
2577                 qp->rq.head += nreq;
2578
2579                 /*
2580                  * Make sure that descriptors are written before
2581                  * doorbell record.
2582                  */
2583                 wmb();
2584
2585                 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
2586         }
2587
2588         spin_unlock_irqrestore(&qp->rq.lock, flags);
2589
2590         return err;
2591 }
2592
2593 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
2594 {
2595         switch (mlx4_state) {
2596         case MLX4_QP_STATE_RST:      return IB_QPS_RESET;
2597         case MLX4_QP_STATE_INIT:     return IB_QPS_INIT;
2598         case MLX4_QP_STATE_RTR:      return IB_QPS_RTR;
2599         case MLX4_QP_STATE_RTS:      return IB_QPS_RTS;
2600         case MLX4_QP_STATE_SQ_DRAINING:
2601         case MLX4_QP_STATE_SQD:      return IB_QPS_SQD;
2602         case MLX4_QP_STATE_SQER:     return IB_QPS_SQE;
2603         case MLX4_QP_STATE_ERR:      return IB_QPS_ERR;
2604         default:                     return -1;
2605         }
2606 }
2607
2608 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
2609 {
2610         switch (mlx4_mig_state) {
2611         case MLX4_QP_PM_ARMED:          return IB_MIG_ARMED;
2612         case MLX4_QP_PM_REARM:          return IB_MIG_REARM;
2613         case MLX4_QP_PM_MIGRATED:       return IB_MIG_MIGRATED;
2614         default: return -1;
2615         }
2616 }
2617
2618 static int to_ib_qp_access_flags(int mlx4_flags)
2619 {
2620         int ib_flags = 0;
2621
2622         if (mlx4_flags & MLX4_QP_BIT_RRE)
2623                 ib_flags |= IB_ACCESS_REMOTE_READ;
2624         if (mlx4_flags & MLX4_QP_BIT_RWE)
2625                 ib_flags |= IB_ACCESS_REMOTE_WRITE;
2626         if (mlx4_flags & MLX4_QP_BIT_RAE)
2627                 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
2628
2629         return ib_flags;
2630 }
2631
2632 static void to_ib_ah_attr(struct mlx4_ib_dev *ibdev, struct ib_ah_attr *ib_ah_attr,
2633                                 struct mlx4_qp_path *path)
2634 {
2635         struct mlx4_dev *dev = ibdev->dev;
2636         int is_eth;
2637
2638         memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
2639         ib_ah_attr->port_num      = path->sched_queue & 0x40 ? 2 : 1;
2640
2641         if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
2642                 return;
2643
2644         is_eth = rdma_port_get_link_layer(&ibdev->ib_dev, ib_ah_attr->port_num) ==
2645                 IB_LINK_LAYER_ETHERNET;
2646         if (is_eth)
2647                 ib_ah_attr->sl = ((path->sched_queue >> 3) & 0x7) |
2648                 ((path->sched_queue & 4) << 1);
2649         else
2650                 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf;
2651
2652         ib_ah_attr->dlid          = be16_to_cpu(path->rlid);
2653         ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
2654         ib_ah_attr->static_rate   = path->static_rate ? path->static_rate - 5 : 0;
2655         ib_ah_attr->ah_flags      = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
2656         if (ib_ah_attr->ah_flags) {
2657                 ib_ah_attr->grh.sgid_index = path->mgid_index;
2658                 ib_ah_attr->grh.hop_limit  = path->hop_limit;
2659                 ib_ah_attr->grh.traffic_class =
2660                         (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
2661                 ib_ah_attr->grh.flow_label =
2662                         be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
2663                 memcpy(ib_ah_attr->grh.dgid.raw,
2664                         path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
2665         }
2666 }
2667
2668 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
2669                      struct ib_qp_init_attr *qp_init_attr)
2670 {
2671         struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
2672         struct mlx4_ib_qp *qp = to_mqp(ibqp);
2673         struct mlx4_qp_context context;
2674         int mlx4_state;
2675         int err = 0;
2676
2677         mutex_lock(&qp->mutex);
2678
2679         if (qp->state == IB_QPS_RESET) {
2680                 qp_attr->qp_state = IB_QPS_RESET;
2681                 goto done;
2682         }
2683
2684         err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
2685         if (err) {
2686                 err = -EINVAL;
2687                 goto out;
2688         }
2689
2690         mlx4_state = be32_to_cpu(context.flags) >> 28;
2691
2692         qp->state                    = to_ib_qp_state(mlx4_state);
2693         qp_attr->qp_state            = qp->state;
2694         qp_attr->path_mtu            = context.mtu_msgmax >> 5;
2695         qp_attr->path_mig_state      =
2696                 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
2697         qp_attr->qkey                = be32_to_cpu(context.qkey);
2698         qp_attr->rq_psn              = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
2699         qp_attr->sq_psn              = be32_to_cpu(context.next_send_psn) & 0xffffff;
2700         qp_attr->dest_qp_num         = be32_to_cpu(context.remote_qpn) & 0xffffff;
2701         qp_attr->qp_access_flags     =
2702                 to_ib_qp_access_flags(be32_to_cpu(context.params2));
2703
2704         if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
2705                 to_ib_ah_attr(dev, &qp_attr->ah_attr, &context.pri_path);
2706                 to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context.alt_path);
2707                 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
2708                 qp_attr->alt_port_num   = qp_attr->alt_ah_attr.port_num;
2709         }
2710
2711         qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
2712         if (qp_attr->qp_state == IB_QPS_INIT)
2713                 qp_attr->port_num = qp->port;
2714         else
2715                 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;
2716
2717         /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
2718         qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;
2719
2720         qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);
2721
2722         qp_attr->max_dest_rd_atomic =
2723                 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
2724         qp_attr->min_rnr_timer      =
2725                 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
2726         qp_attr->timeout            = context.pri_path.ackto >> 3;
2727         qp_attr->retry_cnt          = (be32_to_cpu(context.params1) >> 16) & 0x7;
2728         qp_attr->rnr_retry          = (be32_to_cpu(context.params1) >> 13) & 0x7;
2729         qp_attr->alt_timeout        = context.alt_path.ackto >> 3;
2730
2731 done:
2732         qp_attr->cur_qp_state        = qp_attr->qp_state;
2733         qp_attr->cap.max_recv_wr     = qp->rq.wqe_cnt;
2734         qp_attr->cap.max_recv_sge    = qp->rq.max_gs;
2735
2736         if (!ibqp->uobject) {
2737                 qp_attr->cap.max_send_wr  = qp->sq.wqe_cnt;
2738                 qp_attr->cap.max_send_sge = qp->sq.max_gs;
2739         } else {
2740                 qp_attr->cap.max_send_wr  = 0;
2741                 qp_attr->cap.max_send_sge = 0;
2742         }
2743
2744         /*
2745          * We don't support inline sends for kernel QPs (yet), and we
2746          * don't know what userspace's value should be.
2747          */
2748         qp_attr->cap.max_inline_data = 0;
2749
2750         qp_init_attr->cap            = qp_attr->cap;
2751
2752         qp_init_attr->create_flags = 0;
2753         if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK)
2754                 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
2755
2756         if (qp->flags & MLX4_IB_QP_LSO)
2757                 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
2758
2759         qp_init_attr->sq_sig_type =
2760                 qp->sq_signal_bits == cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) ?
2761                 IB_SIGNAL_ALL_WR : IB_SIGNAL_REQ_WR;
2762
2763 out:
2764         mutex_unlock(&qp->mutex);
2765         return err;
2766 }
2767