drivers/staging/rdma/ipath/ipath_uc.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2005, 2006 PathScale, Inc. 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 "ipath_verbs.h"
  35 #include "ipath_kernel.h"
  36
  37 /* cut down ridiculously long IB macro names */
  38 #define OP(x) IB_OPCODE_UC_##x
  39
  40 /**
  41  * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
  42  * @qp: a pointer to the QP
  43  *
  44  * Return 1 if constructed; otherwise, return 0.
  45  */
  46 int ipath_make_uc_req(struct ipath_qp *qp)
  47 {
  48         struct ipath_other_headers *ohdr;
  49         struct ipath_swqe *wqe;
  50         unsigned long flags;
  51         u32 hwords;
  52         u32 bth0;
  53         u32 len;
  54         u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
  55         int ret = 0;
  56
  57         spin_lock_irqsave(&qp->s_lock, flags);
  58
  59         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
  60                 if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND))
  61                         goto bail;
  62                 /* We are in the error state, flush the work request. */
  63                 if (qp->s_last == qp->s_head)
  64                         goto bail;
  65                 /* If DMAs are in progress, we can't flush immediately. */
  66                 if (atomic_read(&qp->s_dma_busy)) {
  67                         qp->s_flags |= IPATH_S_WAIT_DMA;
  68                         goto bail;
  69                 }
  70                 wqe = get_swqe_ptr(qp, qp->s_last);
  71                 ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
  72                 goto done;
  73         }
  74
  75         ohdr = &qp->s_hdr.u.oth;
  76         if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
  77                 ohdr = &qp->s_hdr.u.l.oth;
  78
  79         /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  80         hwords = 5;
  81         bth0 = 1 << 22; /* Set M bit */
  82
  83         /* Get the next send request. */
  84         wqe = get_swqe_ptr(qp, qp->s_cur);
  85         qp->s_wqe = NULL;
  86         switch (qp->s_state) {
  87         default:
  88                 if (!(ib_ipath_state_ops[qp->state] &
  89                     IPATH_PROCESS_NEXT_SEND_OK))
  90                         goto bail;
  91                 /* Check if send work queue is empty. */
  92                 if (qp->s_cur == qp->s_head)
  93                         goto bail;
  94                 /*
  95                  * Start a new request.
  96                  */
  97                 qp->s_psn = wqe->psn = qp->s_next_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_len = len = wqe->length;
 102                 switch (wqe->wr.opcode) {
 103                 case IB_WR_SEND:
 104                 case IB_WR_SEND_WITH_IMM:
 105                         if (len > pmtu) {
 106                                 qp->s_state = OP(SEND_FIRST);
 107                                 len = pmtu;
 108                                 break;
 109                         }
 110                         if (wqe->wr.opcode == IB_WR_SEND)
 111                                 qp->s_state = OP(SEND_ONLY);
 112                         else {
 113                                 qp->s_state =
 114                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 115                                 /* Immediate data comes after the BTH */
 116                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 117                                 hwords += 1;
 118                         }
 119                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 120                                 bth0 |= 1 << 23;
 121                         qp->s_wqe = wqe;
 122                         if (++qp->s_cur >= qp->s_size)
 123                                 qp->s_cur = 0;
 124                         break;
 125
 126                 case IB_WR_RDMA_WRITE:
 127                 case IB_WR_RDMA_WRITE_WITH_IMM:
 128                         ohdr->u.rc.reth.vaddr =
 129                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 130                         ohdr->u.rc.reth.rkey =
 131                                 cpu_to_be32(wqe->rdma_wr.rkey);
 132                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 133                         hwords += sizeof(struct ib_reth) / 4;
 134                         if (len > pmtu) {
 135                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 136                                 len = pmtu;
 137                                 break;
 138                         }
 139                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 140                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 141                         else {
 142                                 qp->s_state =
 143                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 144                                 /* Immediate data comes after the RETH */
 145                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 146                                 hwords += 1;
 147                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 148                                         bth0 |= 1 << 23;
 149                         }
 150                         qp->s_wqe = wqe;
 151                         if (++qp->s_cur >= qp->s_size)
 152                                 qp->s_cur = 0;
 153                         break;
 154
 155                 default:
 156                         goto bail;
 157                 }
 158                 break;
 159
 160         case OP(SEND_FIRST):
 161                 qp->s_state = OP(SEND_MIDDLE);
 162                 /* FALLTHROUGH */
 163         case OP(SEND_MIDDLE):
 164                 len = qp->s_len;
 165                 if (len > pmtu) {
 166                         len = pmtu;
 167                         break;
 168                 }
 169                 if (wqe->wr.opcode == IB_WR_SEND)
 170                         qp->s_state = OP(SEND_LAST);
 171                 else {
 172                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 173                         /* Immediate data comes after the BTH */
 174                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 175                         hwords += 1;
 176                 }
 177                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 178                         bth0 |= 1 << 23;
 179                 qp->s_wqe = wqe;
 180                 if (++qp->s_cur >= qp->s_size)
 181                         qp->s_cur = 0;
 182                 break;
 183
 184         case OP(RDMA_WRITE_FIRST):
 185                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 186                 /* FALLTHROUGH */
 187         case OP(RDMA_WRITE_MIDDLE):
 188                 len = qp->s_len;
 189                 if (len > pmtu) {
 190                         len = pmtu;
 191                         break;
 192                 }
 193                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 194                         qp->s_state = OP(RDMA_WRITE_LAST);
 195                 else {
 196                         qp->s_state =
 197                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 198                         /* Immediate data comes after the BTH */
 199                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 200                         hwords += 1;
 201                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 202                                 bth0 |= 1 << 23;
 203                 }
 204                 qp->s_wqe = wqe;
 205                 if (++qp->s_cur >= qp->s_size)
 206                         qp->s_cur = 0;
 207                 break;
 208         }
 209         qp->s_len -= len;
 210         qp->s_hdrwords = hwords;
 211         qp->s_cur_sge = &qp->s_sge;
 212         qp->s_cur_size = len;
 213         ipath_make_ruc_header(to_idev(qp->ibqp.device),
 214                               qp, ohdr, bth0 | (qp->s_state << 24),
 215                               qp->s_next_psn++ & IPATH_PSN_MASK);
 216 done:
 217         ret = 1;
 218         goto unlock;
 219
 220 bail:
 221         qp->s_flags &= ~IPATH_S_BUSY;
 222 unlock:
 223         spin_unlock_irqrestore(&qp->s_lock, flags);
 224         return ret;
 225 }
 226
 227 /**
 228  * ipath_uc_rcv - handle an incoming UC packet
 229  * @dev: the device the packet came in on
 230  * @hdr: the header of the packet
 231  * @has_grh: true if the packet has a GRH
 232  * @data: the packet data
 233  * @tlen: the length of the packet
 234  * @qp: the QP for this packet.
 235  *
 236  * This is called from ipath_qp_rcv() to process an incoming UC packet
 237  * for the given QP.
 238  * Called at interrupt level.
 239  */
 240 void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
 241                   int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
 242 {
 243         struct ipath_other_headers *ohdr;
 244         int opcode;
 245         u32 hdrsize;
 246         u32 psn;
 247         u32 pad;
 248         struct ib_wc wc;
 249         u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
 250         struct ib_reth *reth;
 251         int header_in_data;
 252
 253         /* Validate the SLID. See Ch. 9.6.1.5 */
 254         if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
 255                 goto done;
 256
 257         /* Check for GRH */
 258         if (!has_grh) {
 259                 ohdr = &hdr->u.oth;
 260                 hdrsize = 8 + 12;       /* LRH + BTH */
 261                 psn = be32_to_cpu(ohdr->bth[2]);
 262                 header_in_data = 0;
 263         } else {
 264                 ohdr = &hdr->u.l.oth;
 265                 hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
 266                 /*
 267                  * The header with GRH is 60 bytes and the
 268                  * core driver sets the eager header buffer
 269                  * size to 56 bytes so the last 4 bytes of
 270                  * the BTH header (PSN) is in the data buffer.
 271                  */
 272                 header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
 273                 if (header_in_data) {
 274                         psn = be32_to_cpu(((__be32 *) data)[0]);
 275                         data += sizeof(__be32);
 276                 } else
 277                         psn = be32_to_cpu(ohdr->bth[2]);
 278         }
 279         /*
 280          * The opcode is in the low byte when its in network order
 281          * (top byte when in host order).
 282          */
 283         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 284
 285         memset(&wc, 0, sizeof wc);
 286
 287         /* Compare the PSN verses the expected PSN. */
 288         if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
 289                 /*
 290                  * Handle a sequence error.
 291                  * Silently drop any current message.
 292                  */
 293                 qp->r_psn = psn;
 294         inv:
 295                 qp->r_state = OP(SEND_LAST);
 296                 switch (opcode) {
 297                 case OP(SEND_FIRST):
 298                 case OP(SEND_ONLY):
 299                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 300                         goto send_first;
 301
 302                 case OP(RDMA_WRITE_FIRST):
 303                 case OP(RDMA_WRITE_ONLY):
 304                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 305                         goto rdma_first;
 306
 307                 default:
 308                         dev->n_pkt_drops++;
 309                         goto done;
 310                 }
 311         }
 312
 313         /* Check for opcode sequence errors. */
 314         switch (qp->r_state) {
 315         case OP(SEND_FIRST):
 316         case OP(SEND_MIDDLE):
 317                 if (opcode == OP(SEND_MIDDLE) ||
 318                     opcode == OP(SEND_LAST) ||
 319                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 320                         break;
 321                 goto inv;
 322
 323         case OP(RDMA_WRITE_FIRST):
 324         case OP(RDMA_WRITE_MIDDLE):
 325                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 326                     opcode == OP(RDMA_WRITE_LAST) ||
 327                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 328                         break;
 329                 goto inv;
 330
 331         default:
 332                 if (opcode == OP(SEND_FIRST) ||
 333                     opcode == OP(SEND_ONLY) ||
 334                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 335                     opcode == OP(RDMA_WRITE_FIRST) ||
 336                     opcode == OP(RDMA_WRITE_ONLY) ||
 337                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 338                         break;
 339                 goto inv;
 340         }
 341
 342         /* OK, process the packet. */
 343         switch (opcode) {
 344         case OP(SEND_FIRST):
 345         case OP(SEND_ONLY):
 346         case OP(SEND_ONLY_WITH_IMMEDIATE):
 347         send_first:
 348                 if (qp->r_flags & IPATH_R_REUSE_SGE) {
 349                         qp->r_flags &= ~IPATH_R_REUSE_SGE;
 350                         qp->r_sge = qp->s_rdma_read_sge;
 351                 } else if (!ipath_get_rwqe(qp, 0)) {
 352                         dev->n_pkt_drops++;
 353                         goto done;
 354                 }
 355                 /* Save the WQE so we can reuse it in case of an error. */
 356                 qp->s_rdma_read_sge = qp->r_sge;
 357                 qp->r_rcv_len = 0;
 358                 if (opcode == OP(SEND_ONLY))
 359                         goto send_last;
 360                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 361                         goto send_last_imm;
 362                 /* FALLTHROUGH */
 363         case OP(SEND_MIDDLE):
 364                 /* Check for invalid length PMTU or posted rwqe len. */
 365                 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
 366                         qp->r_flags |= IPATH_R_REUSE_SGE;
 367                         dev->n_pkt_drops++;
 368                         goto done;
 369                 }
 370                 qp->r_rcv_len += pmtu;
 371                 if (unlikely(qp->r_rcv_len > qp->r_len)) {
 372                         qp->r_flags |= IPATH_R_REUSE_SGE;
 373                         dev->n_pkt_drops++;
 374                         goto done;
 375                 }
 376                 ipath_copy_sge(&qp->r_sge, data, pmtu);
 377                 break;
 378
 379         case OP(SEND_LAST_WITH_IMMEDIATE):
 380         send_last_imm:
 381                 if (header_in_data) {
 382                         wc.ex.imm_data = *(__be32 *) data;
 383                         data += sizeof(__be32);
 384                 } else {
 385                         /* Immediate data comes after BTH */
 386                         wc.ex.imm_data = ohdr->u.imm_data;
 387                 }
 388                 hdrsize += 4;
 389                 wc.wc_flags = IB_WC_WITH_IMM;
 390                 /* FALLTHROUGH */
 391         case OP(SEND_LAST):
 392         send_last:
 393                 /* Get the number of bytes the message was padded by. */
 394                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 395                 /* Check for invalid length. */
 396                 /* XXX LAST len should be >= 1 */
 397                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 398                         qp->r_flags |= IPATH_R_REUSE_SGE;
 399                         dev->n_pkt_drops++;
 400                         goto done;
 401                 }
 402                 /* Don't count the CRC. */
 403                 tlen -= (hdrsize + pad + 4);
 404                 wc.byte_len = tlen + qp->r_rcv_len;
 405                 if (unlikely(wc.byte_len > qp->r_len)) {
 406                         qp->r_flags |= IPATH_R_REUSE_SGE;
 407                         dev->n_pkt_drops++;
 408                         goto done;
 409                 }
 410                 wc.opcode = IB_WC_RECV;
 411         last_imm:
 412                 ipath_copy_sge(&qp->r_sge, data, tlen);
 413                 wc.wr_id = qp->r_wr_id;
 414                 wc.status = IB_WC_SUCCESS;
 415                 wc.qp = &qp->ibqp;
 416                 wc.src_qp = qp->remote_qpn;
 417                 wc.slid = qp->remote_ah_attr.dlid;
 418                 wc.sl = qp->remote_ah_attr.sl;
 419                 /* Signal completion event if the solicited bit is set. */
 420                 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
 421                                (ohdr->bth[0] &
 422                                 cpu_to_be32(1 << 23)) != 0);
 423                 break;
 424
 425         case OP(RDMA_WRITE_FIRST):
 426         case OP(RDMA_WRITE_ONLY):
 427         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 428         rdma_first:
 429                 /* RETH comes after BTH */
 430                 if (!header_in_data)
 431                         reth = &ohdr->u.rc.reth;
 432                 else {
 433                         reth = (struct ib_reth *)data;
 434                         data += sizeof(*reth);
 435                 }
 436                 hdrsize += sizeof(*reth);
 437                 qp->r_len = be32_to_cpu(reth->length);
 438                 qp->r_rcv_len = 0;
 439                 if (qp->r_len != 0) {
 440                         u32 rkey = be32_to_cpu(reth->rkey);
 441                         u64 vaddr = be64_to_cpu(reth->vaddr);
 442                         int ok;
 443
 444                         /* Check rkey */
 445                         ok = ipath_rkey_ok(qp, &qp->r_sge, qp->r_len,
 446                                            vaddr, rkey,
 447                                            IB_ACCESS_REMOTE_WRITE);
 448                         if (unlikely(!ok)) {
 449                                 dev->n_pkt_drops++;
 450                                 goto done;
 451                         }
 452                 } else {
 453                         qp->r_sge.sg_list = NULL;
 454                         qp->r_sge.sge.mr = NULL;
 455                         qp->r_sge.sge.vaddr = NULL;
 456                         qp->r_sge.sge.length = 0;
 457                         qp->r_sge.sge.sge_length = 0;
 458                 }
 459                 if (unlikely(!(qp->qp_access_flags &
 460                                IB_ACCESS_REMOTE_WRITE))) {
 461                         dev->n_pkt_drops++;
 462                         goto done;
 463                 }
 464                 if (opcode == OP(RDMA_WRITE_ONLY))
 465                         goto rdma_last;
 466                 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 467                         goto rdma_last_imm;
 468                 /* FALLTHROUGH */
 469         case OP(RDMA_WRITE_MIDDLE):
 470                 /* Check for invalid length PMTU or posted rwqe len. */
 471                 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
 472                         dev->n_pkt_drops++;
 473                         goto done;
 474                 }
 475                 qp->r_rcv_len += pmtu;
 476                 if (unlikely(qp->r_rcv_len > qp->r_len)) {
 477                         dev->n_pkt_drops++;
 478                         goto done;
 479                 }
 480                 ipath_copy_sge(&qp->r_sge, data, pmtu);
 481                 break;
 482
 483         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 484         rdma_last_imm:
 485                 if (header_in_data) {
 486                         wc.ex.imm_data = *(__be32 *) data;
 487                         data += sizeof(__be32);
 488                 } else {
 489                         /* Immediate data comes after BTH */
 490                         wc.ex.imm_data = ohdr->u.imm_data;
 491                 }
 492                 hdrsize += 4;
 493                 wc.wc_flags = IB_WC_WITH_IMM;
 494
 495                 /* Get the number of bytes the message was padded by. */
 496                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 497                 /* Check for invalid length. */
 498                 /* XXX LAST len should be >= 1 */
 499                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 500                         dev->n_pkt_drops++;
 501                         goto done;
 502                 }
 503                 /* Don't count the CRC. */
 504                 tlen -= (hdrsize + pad + 4);
 505                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
 506                         dev->n_pkt_drops++;
 507                         goto done;
 508                 }
 509                 if (qp->r_flags & IPATH_R_REUSE_SGE)
 510                         qp->r_flags &= ~IPATH_R_REUSE_SGE;
 511                 else if (!ipath_get_rwqe(qp, 1)) {
 512                         dev->n_pkt_drops++;
 513                         goto done;
 514                 }
 515                 wc.byte_len = qp->r_len;
 516                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 517                 goto last_imm;
 518
 519         case OP(RDMA_WRITE_LAST):
 520         rdma_last:
 521                 /* Get the number of bytes the message was padded by. */
 522                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 523                 /* Check for invalid length. */
 524                 /* XXX LAST len should be >= 1 */
 525                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 526                         dev->n_pkt_drops++;
 527                         goto done;
 528                 }
 529                 /* Don't count the CRC. */
 530                 tlen -= (hdrsize + pad + 4);
 531                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
 532                         dev->n_pkt_drops++;
 533                         goto done;
 534                 }
 535                 ipath_copy_sge(&qp->r_sge, data, tlen);
 536                 break;
 537
 538         default:
 539                 /* Drop packet for unknown opcodes. */
 540                 dev->n_pkt_drops++;
 541                 goto done;
 542         }
 543         qp->r_psn++;
 544         qp->r_state = opcode;
 545 done:
 546         return;
 547 }