drivers/infiniband/hw/qib/qib_uc.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
   3  * All rights reserved.
   4  * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include "qib.h"
  36
  37 /* cut down ridiculously long IB macro names */
  38 #define OP(x) IB_OPCODE_UC_##x
  39
  40 /**
  41  * qib_make_uc_req - construct a request packet (SEND, RDMA write)
  42  * @qp: a pointer to the QP
  43  *
  44  * Assumes the s_lock is held.
  45  *
  46  * Return 1 if constructed; otherwise, return 0.
  47  */
  48 int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
  49 {
  50         struct qib_qp_priv *priv = qp->priv;
  51         struct ib_other_headers *ohdr;
  52         struct rvt_swqe *wqe;
  53         u32 hwords;
  54         u32 bth0;
  55         u32 len;
  56         u32 pmtu = qp->pmtu;
  57         int ret = 0;
  58
  59         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
  60                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
  61                         goto bail;
  62                 /* We are in the error state, flush the work request. */
  63                 if (qp->s_last == READ_ONCE(qp->s_head))
  64                         goto bail;
  65                 /* If DMAs are in progress, we can't flush immediately. */
  66                 if (atomic_read(&priv->s_dma_busy)) {
  67                         qp->s_flags |= RVT_S_WAIT_DMA;
  68                         goto bail;
  69                 }
  70                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
  71                 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
  72                 goto done;
  73         }
  74
  75         ohdr = &priv->s_hdr->u.oth;
  76         if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
  77                 ohdr = &priv->s_hdr->u.l.oth;
  78
  79         /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  80         hwords = 5;
  81         bth0 = 0;
  82
  83         /* Get the next send request. */
  84         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
  85         qp->s_wqe = NULL;
  86         switch (qp->s_state) {
  87         default:
  88                 if (!(ib_rvt_state_ops[qp->state] &
  89                     RVT_PROCESS_NEXT_SEND_OK))
  90                         goto bail;
  91                 /* Check if send work queue is empty. */
  92                 if (qp->s_cur == READ_ONCE(qp->s_head))
  93                         goto bail;
  94                 /*
  95                  * Start a new request.
  96                  */
  97                 qp->s_psn = wqe->psn;
  98                 qp->s_sge.sge = wqe->sg_list[0];
  99                 qp->s_sge.sg_list = wqe->sg_list + 1;
 100                 qp->s_sge.num_sge = wqe->wr.num_sge;
 101                 qp->s_sge.total_len = wqe->length;
 102                 len = wqe->length;
 103                 qp->s_len = len;
 104                 switch (wqe->wr.opcode) {
 105                 case IB_WR_SEND:
 106                 case IB_WR_SEND_WITH_IMM:
 107                         if (len > pmtu) {
 108                                 qp->s_state = OP(SEND_FIRST);
 109                                 len = pmtu;
 110                                 break;
 111                         }
 112                         if (wqe->wr.opcode == IB_WR_SEND)
 113                                 qp->s_state = OP(SEND_ONLY);
 114                         else {
 115                                 qp->s_state =
 116                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 117                                 /* Immediate data comes after the BTH */
 118                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 119                                 hwords += 1;
 120                         }
 121                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 122                                 bth0 |= IB_BTH_SOLICITED;
 123                         qp->s_wqe = wqe;
 124                         if (++qp->s_cur >= qp->s_size)
 125                                 qp->s_cur = 0;
 126                         break;
 127
 128                 case IB_WR_RDMA_WRITE:
 129                 case IB_WR_RDMA_WRITE_WITH_IMM:
 130                         ohdr->u.rc.reth.vaddr =
 131                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 132                         ohdr->u.rc.reth.rkey =
 133                                 cpu_to_be32(wqe->rdma_wr.rkey);
 134                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 135                         hwords += sizeof(struct ib_reth) / 4;
 136                         if (len > pmtu) {
 137                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 138                                 len = pmtu;
 139                                 break;
 140                         }
 141                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 142                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 143                         else {
 144                                 qp->s_state =
 145                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 146                                 /* Immediate data comes after the RETH */
 147                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 148                                 hwords += 1;
 149                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 150                                         bth0 |= IB_BTH_SOLICITED;
 151                         }
 152                         qp->s_wqe = wqe;
 153                         if (++qp->s_cur >= qp->s_size)
 154                                 qp->s_cur = 0;
 155                         break;
 156
 157                 default:
 158                         goto bail;
 159                 }
 160                 break;
 161
 162         case OP(SEND_FIRST):
 163                 qp->s_state = OP(SEND_MIDDLE);
 164                 /* FALLTHROUGH */
 165         case OP(SEND_MIDDLE):
 166                 len = qp->s_len;
 167                 if (len > pmtu) {
 168                         len = pmtu;
 169                         break;
 170                 }
 171                 if (wqe->wr.opcode == IB_WR_SEND)
 172                         qp->s_state = OP(SEND_LAST);
 173                 else {
 174                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 175                         /* Immediate data comes after the BTH */
 176                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 177                         hwords += 1;
 178                 }
 179                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 180                         bth0 |= IB_BTH_SOLICITED;
 181                 qp->s_wqe = wqe;
 182                 if (++qp->s_cur >= qp->s_size)
 183                         qp->s_cur = 0;
 184                 break;
 185
 186         case OP(RDMA_WRITE_FIRST):
 187                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 188                 /* FALLTHROUGH */
 189         case OP(RDMA_WRITE_MIDDLE):
 190                 len = qp->s_len;
 191                 if (len > pmtu) {
 192                         len = pmtu;
 193                         break;
 194                 }
 195                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 196                         qp->s_state = OP(RDMA_WRITE_LAST);
 197                 else {
 198                         qp->s_state =
 199                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 200                         /* Immediate data comes after the BTH */
 201                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 202                         hwords += 1;
 203                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 204                                 bth0 |= IB_BTH_SOLICITED;
 205                 }
 206                 qp->s_wqe = wqe;
 207                 if (++qp->s_cur >= qp->s_size)
 208                         qp->s_cur = 0;
 209                 break;
 210         }
 211         qp->s_len -= len;
 212         qp->s_hdrwords = hwords;
 213         qp->s_cur_sge = &qp->s_sge;
 214         qp->s_cur_size = len;
 215         qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 216                             qp->s_psn++ & QIB_PSN_MASK);
 217 done:
 218         return 1;
 219 bail:
 220         qp->s_flags &= ~RVT_S_BUSY;
 221         return ret;
 222 }
 223
 224 /**
 225  * qib_uc_rcv - handle an incoming UC packet
 226  * @ibp: the port the packet came in on
 227  * @hdr: the header of the packet
 228  * @has_grh: true if the packet has a GRH
 229  * @data: the packet data
 230  * @tlen: the length of the packet
 231  * @qp: the QP for this packet.
 232  *
 233  * This is called from qib_qp_rcv() to process an incoming UC packet
 234  * for the given QP.
 235  * Called at interrupt level.
 236  */
 237 void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
 238                 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
 239 {
 240         struct ib_other_headers *ohdr;
 241         u32 opcode;
 242         u32 hdrsize;
 243         u32 psn;
 244         u32 pad;
 245         struct ib_wc wc;
 246         u32 pmtu = qp->pmtu;
 247         struct ib_reth *reth;
 248         int ret;
 249
 250         /* Check for GRH */
 251         if (!has_grh) {
 252                 ohdr = &hdr->u.oth;
 253                 hdrsize = 8 + 12;       /* LRH + BTH */
 254         } else {
 255                 ohdr = &hdr->u.l.oth;
 256                 hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
 257         }
 258
 259         opcode = be32_to_cpu(ohdr->bth[0]);
 260         if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
 261                 return;
 262
 263         psn = be32_to_cpu(ohdr->bth[2]);
 264         opcode >>= 24;
 265
 266         /* Compare the PSN verses the expected PSN. */
 267         if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
 268                 /*
 269                  * Handle a sequence error.
 270                  * Silently drop any current message.
 271                  */
 272                 qp->r_psn = psn;
 273 inv:
 274                 if (qp->r_state == OP(SEND_FIRST) ||
 275                     qp->r_state == OP(SEND_MIDDLE)) {
 276                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 277                         qp->r_sge.num_sge = 0;
 278                 } else
 279                         rvt_put_ss(&qp->r_sge);
 280                 qp->r_state = OP(SEND_LAST);
 281                 switch (opcode) {
 282                 case OP(SEND_FIRST):
 283                 case OP(SEND_ONLY):
 284                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 285                         goto send_first;
 286
 287                 case OP(RDMA_WRITE_FIRST):
 288                 case OP(RDMA_WRITE_ONLY):
 289                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 290                         goto rdma_first;
 291
 292                 default:
 293                         goto drop;
 294                 }
 295         }
 296
 297         /* Check for opcode sequence errors. */
 298         switch (qp->r_state) {
 299         case OP(SEND_FIRST):
 300         case OP(SEND_MIDDLE):
 301                 if (opcode == OP(SEND_MIDDLE) ||
 302                     opcode == OP(SEND_LAST) ||
 303                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 304                         break;
 305                 goto inv;
 306
 307         case OP(RDMA_WRITE_FIRST):
 308         case OP(RDMA_WRITE_MIDDLE):
 309                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 310                     opcode == OP(RDMA_WRITE_LAST) ||
 311                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 312                         break;
 313                 goto inv;
 314
 315         default:
 316                 if (opcode == OP(SEND_FIRST) ||
 317                     opcode == OP(SEND_ONLY) ||
 318                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 319                     opcode == OP(RDMA_WRITE_FIRST) ||
 320                     opcode == OP(RDMA_WRITE_ONLY) ||
 321                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 322                         break;
 323                 goto inv;
 324         }
 325
 326         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
 327                 rvt_comm_est(qp);
 328
 329         /* OK, process the packet. */
 330         switch (opcode) {
 331         case OP(SEND_FIRST):
 332         case OP(SEND_ONLY):
 333         case OP(SEND_ONLY_WITH_IMMEDIATE):
 334 send_first:
 335                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
 336                         qp->r_sge = qp->s_rdma_read_sge;
 337                 else {
 338                         ret = rvt_get_rwqe(qp, false);
 339                         if (ret < 0)
 340                                 goto op_err;
 341                         if (!ret)
 342                                 goto drop;
 343                         /*
 344                          * qp->s_rdma_read_sge will be the owner
 345                          * of the mr references.
 346                          */
 347                         qp->s_rdma_read_sge = qp->r_sge;
 348                 }
 349                 qp->r_rcv_len = 0;
 350                 if (opcode == OP(SEND_ONLY))
 351                         goto no_immediate_data;
 352                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 353                         goto send_last_imm;
 354                 /* FALLTHROUGH */
 355         case OP(SEND_MIDDLE):
 356                 /* Check for invalid length PMTU or posted rwqe len. */
 357                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 358                         goto rewind;
 359                 qp->r_rcv_len += pmtu;
 360                 if (unlikely(qp->r_rcv_len > qp->r_len))
 361                         goto rewind;
 362                 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
 363                 break;
 364
 365         case OP(SEND_LAST_WITH_IMMEDIATE):
 366 send_last_imm:
 367                 wc.ex.imm_data = ohdr->u.imm_data;
 368                 hdrsize += 4;
 369                 wc.wc_flags = IB_WC_WITH_IMM;
 370                 goto send_last;
 371         case OP(SEND_LAST):
 372 no_immediate_data:
 373                 wc.ex.imm_data = 0;
 374                 wc.wc_flags = 0;
 375 send_last:
 376                 /* Get the number of bytes the message was padded by. */
 377                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 378                 /* Check for invalid length. */
 379                 /* XXX LAST len should be >= 1 */
 380                 if (unlikely(tlen < (hdrsize + pad + 4)))
 381                         goto rewind;
 382                 /* Don't count the CRC. */
 383                 tlen -= (hdrsize + pad + 4);
 384                 wc.byte_len = tlen + qp->r_rcv_len;
 385                 if (unlikely(wc.byte_len > qp->r_len))
 386                         goto rewind;
 387                 wc.opcode = IB_WC_RECV;
 388                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
 389                 rvt_put_ss(&qp->s_rdma_read_sge);
 390 last_imm:
 391                 wc.wr_id = qp->r_wr_id;
 392                 wc.status = IB_WC_SUCCESS;
 393                 wc.qp = &qp->ibqp;
 394                 wc.src_qp = qp->remote_qpn;
 395                 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
 396                 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
 397                 /* zero fields that are N/A */
 398                 wc.vendor_err = 0;
 399                 wc.pkey_index = 0;
 400                 wc.dlid_path_bits = 0;
 401                 wc.port_num = 0;
 402                 /* Signal completion event if the solicited bit is set. */
 403                 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
 404                 break;
 405
 406         case OP(RDMA_WRITE_FIRST):
 407         case OP(RDMA_WRITE_ONLY):
 408         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 409 rdma_first:
 410                 if (unlikely(!(qp->qp_access_flags &
 411                                IB_ACCESS_REMOTE_WRITE))) {
 412                         goto drop;
 413                 }
 414                 reth = &ohdr->u.rc.reth;
 415                 hdrsize += sizeof(*reth);
 416                 qp->r_len = be32_to_cpu(reth->length);
 417                 qp->r_rcv_len = 0;
 418                 qp->r_sge.sg_list = NULL;
 419                 if (qp->r_len != 0) {
 420                         u32 rkey = be32_to_cpu(reth->rkey);
 421                         u64 vaddr = be64_to_cpu(reth->vaddr);
 422                         int ok;
 423
 424                         /* Check rkey */
 425                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 426                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 427                         if (unlikely(!ok))
 428                                 goto drop;
 429                         qp->r_sge.num_sge = 1;
 430                 } else {
 431                         qp->r_sge.num_sge = 0;
 432                         qp->r_sge.sge.mr = NULL;
 433                         qp->r_sge.sge.vaddr = NULL;
 434                         qp->r_sge.sge.length = 0;
 435                         qp->r_sge.sge.sge_length = 0;
 436                 }
 437                 if (opcode == OP(RDMA_WRITE_ONLY))
 438                         goto rdma_last;
 439                 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 440                         wc.ex.imm_data = ohdr->u.rc.imm_data;
 441                         goto rdma_last_imm;
 442                 }
 443                 /* FALLTHROUGH */
 444         case OP(RDMA_WRITE_MIDDLE):
 445                 /* Check for invalid length PMTU or posted rwqe len. */
 446                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 447                         goto drop;
 448                 qp->r_rcv_len += pmtu;
 449                 if (unlikely(qp->r_rcv_len > qp->r_len))
 450                         goto drop;
 451                 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
 452                 break;
 453
 454         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 455                 wc.ex.imm_data = ohdr->u.imm_data;
 456 rdma_last_imm:
 457                 hdrsize += 4;
 458                 wc.wc_flags = IB_WC_WITH_IMM;
 459
 460                 /* Get the number of bytes the message was padded by. */
 461                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 462                 /* Check for invalid length. */
 463                 /* XXX LAST len should be >= 1 */
 464                 if (unlikely(tlen < (hdrsize + pad + 4)))
 465                         goto drop;
 466                 /* Don't count the CRC. */
 467                 tlen -= (hdrsize + pad + 4);
 468                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 469                         goto drop;
 470                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
 471                         rvt_put_ss(&qp->s_rdma_read_sge);
 472                 else {
 473                         ret = rvt_get_rwqe(qp, true);
 474                         if (ret < 0)
 475                                 goto op_err;
 476                         if (!ret)
 477                                 goto drop;
 478                 }
 479                 wc.byte_len = qp->r_len;
 480                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 481                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
 482                 rvt_put_ss(&qp->r_sge);
 483                 goto last_imm;
 484
 485         case OP(RDMA_WRITE_LAST):
 486 rdma_last:
 487                 /* Get the number of bytes the message was padded by. */
 488                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 489                 /* Check for invalid length. */
 490                 /* XXX LAST len should be >= 1 */
 491                 if (unlikely(tlen < (hdrsize + pad + 4)))
 492                         goto drop;
 493                 /* Don't count the CRC. */
 494                 tlen -= (hdrsize + pad + 4);
 495                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 496                         goto drop;
 497                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
 498                 rvt_put_ss(&qp->r_sge);
 499                 break;
 500
 501         default:
 502                 /* Drop packet for unknown opcodes. */
 503                 goto drop;
 504         }
 505         qp->r_psn++;
 506         qp->r_state = opcode;
 507         return;
 508
 509 rewind:
 510         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 511         qp->r_sge.num_sge = 0;
 512 drop:
 513         ibp->rvp.n_pkt_drops++;
 514         return;
 515
 516 op_err:
 517         rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 518         return;
 519
 520 }