drivers/infiniband/hw/ipath/ipath_uc.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. 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 static void complete_last_send(struct ipath_qp *qp, struct ipath_swqe *wqe,
  41                                struct ib_wc *wc)
  42 {
  43         if (++qp->s_last == qp->s_size)
  44                 qp->s_last = 0;
  45         if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
  46             (wqe->wr.send_flags & IB_SEND_SIGNALED)) {
  47                 wc->wr_id = wqe->wr.wr_id;
  48                 wc->status = IB_WC_SUCCESS;
  49                 wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
  50                 wc->vendor_err = 0;
  51                 wc->byte_len = wqe->length;
  52                 wc->qp = &qp->ibqp;
  53                 wc->src_qp = qp->remote_qpn;
  54                 wc->pkey_index = 0;
  55                 wc->slid = qp->remote_ah_attr.dlid;
  56                 wc->sl = qp->remote_ah_attr.sl;
  57                 wc->dlid_path_bits = 0;
  58                 wc->port_num = 0;
  59                 ipath_cq_enter(to_icq(qp->ibqp.send_cq), wc, 0);
  60         }
  61 }
  62
  63 /**
  64  * ipath_make_uc_req - construct a request packet (SEND, RDMA write)
  65  * @qp: a pointer to the QP
  66  * @ohdr: a pointer to the IB header being constructed
  67  * @pmtu: the path MTU
  68  * @bth0p: pointer to the BTH opcode word
  69  * @bth2p: pointer to the BTH PSN word
  70  *
  71  * Return 1 if constructed; otherwise, return 0.
  72  * Note the QP s_lock must be held and interrupts disabled.
  73  */
  74 int ipath_make_uc_req(struct ipath_qp *qp,
  75                       struct ipath_other_headers *ohdr,
  76                       u32 pmtu, u32 *bth0p, u32 *bth2p)
  77 {
  78         struct ipath_swqe *wqe;
  79         u32 hwords;
  80         u32 bth0;
  81         u32 len;
  82         struct ib_wc wc;
  83
  84         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK))
  85                 goto done;
  86
  87         /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  88         hwords = 5;
  89         bth0 = 0;
  90
  91         /* Get the next send request. */
  92         wqe = get_swqe_ptr(qp, qp->s_last);
  93         switch (qp->s_state) {
  94         default:
  95                 /*
  96                  * Signal the completion of the last send
  97                  * (if there is one).
  98                  */
  99                 if (qp->s_last != qp->s_tail) {
 100                         complete_last_send(qp, wqe, &wc);
 101                         wqe = get_swqe_ptr(qp, qp->s_last);
 102                 }
 103
 104                 /* Check if send work queue is empty. */
 105                 if (qp->s_tail == qp->s_head)
 106                         goto done;
 107                 /*
 108                  * Start a new request.
 109                  */
 110                 qp->s_psn = wqe->psn = qp->s_next_psn;
 111                 qp->s_sge.sge = wqe->sg_list[0];
 112                 qp->s_sge.sg_list = wqe->sg_list + 1;
 113                 qp->s_sge.num_sge = wqe->wr.num_sge;
 114                 qp->s_len = len = wqe->length;
 115                 switch (wqe->wr.opcode) {
 116                 case IB_WR_SEND:
 117                 case IB_WR_SEND_WITH_IMM:
 118                         if (len > pmtu) {
 119                                 qp->s_state = OP(SEND_FIRST);
 120                                 len = pmtu;
 121                                 break;
 122                         }
 123                         if (wqe->wr.opcode == IB_WR_SEND)
 124                                 qp->s_state = OP(SEND_ONLY);
 125                         else {
 126                                 qp->s_state =
 127                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 128                                 /* Immediate data comes after the BTH */
 129                                 ohdr->u.imm_data = wqe->wr.imm_data;
 130                                 hwords += 1;
 131                         }
 132                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 133                                 bth0 |= 1 << 23;
 134                         break;
 135
 136                 case IB_WR_RDMA_WRITE:
 137                 case IB_WR_RDMA_WRITE_WITH_IMM:
 138                         ohdr->u.rc.reth.vaddr =
 139                                 cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
 140                         ohdr->u.rc.reth.rkey =
 141                                 cpu_to_be32(wqe->wr.wr.rdma.rkey);
 142                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 143                         hwords += sizeof(struct ib_reth) / 4;
 144                         if (len > pmtu) {
 145                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 146                                 len = pmtu;
 147                                 break;
 148                         }
 149                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 150                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 151                         else {
 152                                 qp->s_state =
 153                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 154                                 /* Immediate data comes after the RETH */
 155                                 ohdr->u.rc.imm_data = wqe->wr.imm_data;
 156                                 hwords += 1;
 157                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 158                                         bth0 |= 1 << 23;
 159                         }
 160                         break;
 161
 162                 default:
 163                         goto done;
 164                 }
 165                 if (++qp->s_tail >= qp->s_size)
 166                         qp->s_tail = 0;
 167                 break;
 168
 169         case OP(SEND_FIRST):
 170                 qp->s_state = OP(SEND_MIDDLE);
 171                 /* FALLTHROUGH */
 172         case OP(SEND_MIDDLE):
 173                 len = qp->s_len;
 174                 if (len > pmtu) {
 175                         len = pmtu;
 176                         break;
 177                 }
 178                 if (wqe->wr.opcode == IB_WR_SEND)
 179                         qp->s_state = OP(SEND_LAST);
 180                 else {
 181                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 182                         /* Immediate data comes after the BTH */
 183                         ohdr->u.imm_data = wqe->wr.imm_data;
 184                         hwords += 1;
 185                 }
 186                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 187                         bth0 |= 1 << 23;
 188                 break;
 189
 190         case OP(RDMA_WRITE_FIRST):
 191                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 192                 /* FALLTHROUGH */
 193         case OP(RDMA_WRITE_MIDDLE):
 194                 len = qp->s_len;
 195                 if (len > pmtu) {
 196                         len = pmtu;
 197                         break;
 198                 }
 199                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 200                         qp->s_state = OP(RDMA_WRITE_LAST);
 201                 else {
 202                         qp->s_state =
 203                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 204                         /* Immediate data comes after the BTH */
 205                         ohdr->u.imm_data = wqe->wr.imm_data;
 206                         hwords += 1;
 207                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 208                                 bth0 |= 1 << 23;
 209                 }
 210                 break;
 211         }
 212         qp->s_len -= len;
 213         qp->s_hdrwords = hwords;
 214         qp->s_cur_sge = &qp->s_sge;
 215         qp->s_cur_size = len;
 216         *bth0p = bth0 | (qp->s_state << 24);
 217         *bth2p = qp->s_next_psn++ & IPATH_PSN_MASK;
 218         return 1;
 219
 220 done:
 221         return 0;
 222 }
 223
 224 /**
 225  * ipath_uc_rcv - handle an incoming UC packet
 226  * @dev: the device 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 ipath_qp_rcv() to process an incoming UC packet
 234  * for the given QP.
 235  * Called at interrupt level.
 236  */
 237 void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
 238                   int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
 239 {
 240         struct ipath_other_headers *ohdr;
 241         int opcode;
 242         u32 hdrsize;
 243         u32 psn;
 244         u32 pad;
 245         struct ib_wc wc;
 246         u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
 247         struct ib_reth *reth;
 248         int header_in_data;
 249
 250         /* Validate the SLID. See Ch. 9.6.1.5 */
 251         if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
 252                 goto done;
 253
 254         /* Check for GRH */
 255         if (!has_grh) {
 256                 ohdr = &hdr->u.oth;
 257                 hdrsize = 8 + 12;       /* LRH + BTH */
 258                 psn = be32_to_cpu(ohdr->bth[2]);
 259                 header_in_data = 0;
 260         } else {
 261                 ohdr = &hdr->u.l.oth;
 262                 hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
 263                 /*
 264                  * The header with GRH is 60 bytes and the
 265                  * core driver sets the eager header buffer
 266                  * size to 56 bytes so the last 4 bytes of
 267                  * the BTH header (PSN) is in the data buffer.
 268                  */
 269                 header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
 270                 if (header_in_data) {
 271                         psn = be32_to_cpu(((__be32 *) data)[0]);
 272                         data += sizeof(__be32);
 273                 } else
 274                         psn = be32_to_cpu(ohdr->bth[2]);
 275         }
 276         /*
 277          * The opcode is in the low byte when its in network order
 278          * (top byte when in host order).
 279          */
 280         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 281
 282         wc.imm_data = 0;
 283         wc.wc_flags = 0;
 284
 285         /* Compare the PSN verses the expected PSN. */
 286         if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
 287                 /*
 288                  * Handle a sequence error.
 289                  * Silently drop any current message.
 290                  */
 291                 qp->r_psn = psn;
 292         inv:
 293                 qp->r_state = OP(SEND_LAST);
 294                 switch (opcode) {
 295                 case OP(SEND_FIRST):
 296                 case OP(SEND_ONLY):
 297                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 298                         goto send_first;
 299
 300                 case OP(RDMA_WRITE_FIRST):
 301                 case OP(RDMA_WRITE_ONLY):
 302                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 303                         goto rdma_first;
 304
 305                 default:
 306                         dev->n_pkt_drops++;
 307                         goto done;
 308                 }
 309         }
 310
 311         /* Check for opcode sequence errors. */
 312         switch (qp->r_state) {
 313         case OP(SEND_FIRST):
 314         case OP(SEND_MIDDLE):
 315                 if (opcode == OP(SEND_MIDDLE) ||
 316                     opcode == OP(SEND_LAST) ||
 317                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 318                         break;
 319                 goto inv;
 320
 321         case OP(RDMA_WRITE_FIRST):
 322         case OP(RDMA_WRITE_MIDDLE):
 323                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 324                     opcode == OP(RDMA_WRITE_LAST) ||
 325                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 326                         break;
 327                 goto inv;
 328
 329         default:
 330                 if (opcode == OP(SEND_FIRST) ||
 331                     opcode == OP(SEND_ONLY) ||
 332                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 333                     opcode == OP(RDMA_WRITE_FIRST) ||
 334                     opcode == OP(RDMA_WRITE_ONLY) ||
 335                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 336                         break;
 337                 goto inv;
 338         }
 339
 340         /* OK, process the packet. */
 341         switch (opcode) {
 342         case OP(SEND_FIRST):
 343         case OP(SEND_ONLY):
 344         case OP(SEND_ONLY_WITH_IMMEDIATE):
 345         send_first:
 346                 if (qp->r_reuse_sge) {
 347                         qp->r_reuse_sge = 0;
 348                         qp->r_sge = qp->s_rdma_read_sge;
 349                 } else if (!ipath_get_rwqe(qp, 0)) {
 350                         dev->n_pkt_drops++;
 351                         goto done;
 352                 }
 353                 /* Save the WQE so we can reuse it in case of an error. */
 354                 qp->s_rdma_read_sge = qp->r_sge;
 355                 qp->r_rcv_len = 0;
 356                 if (opcode == OP(SEND_ONLY))
 357                         goto send_last;
 358                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 359                         goto send_last_imm;
 360                 /* FALLTHROUGH */
 361         case OP(SEND_MIDDLE):
 362                 /* Check for invalid length PMTU or posted rwqe len. */
 363                 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
 364                         qp->r_reuse_sge = 1;
 365                         dev->n_pkt_drops++;
 366                         goto done;
 367                 }
 368                 qp->r_rcv_len += pmtu;
 369                 if (unlikely(qp->r_rcv_len > qp->r_len)) {
 370                         qp->r_reuse_sge = 1;
 371                         dev->n_pkt_drops++;
 372                         goto done;
 373                 }
 374                 ipath_copy_sge(&qp->r_sge, data, pmtu);
 375                 break;
 376
 377         case OP(SEND_LAST_WITH_IMMEDIATE):
 378         send_last_imm:
 379                 if (header_in_data) {
 380                         wc.imm_data = *(__be32 *) data;
 381                         data += sizeof(__be32);
 382                 } else {
 383                         /* Immediate data comes after BTH */
 384                         wc.imm_data = ohdr->u.imm_data;
 385                 }
 386                 hdrsize += 4;
 387                 wc.wc_flags = IB_WC_WITH_IMM;
 388                 /* FALLTHROUGH */
 389         case OP(SEND_LAST):
 390         send_last:
 391                 /* Get the number of bytes the message was padded by. */
 392                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 393                 /* Check for invalid length. */
 394                 /* XXX LAST len should be >= 1 */
 395                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 396                         qp->r_reuse_sge = 1;
 397                         dev->n_pkt_drops++;
 398                         goto done;
 399                 }
 400                 /* Don't count the CRC. */
 401                 tlen -= (hdrsize + pad + 4);
 402                 wc.byte_len = tlen + qp->r_rcv_len;
 403                 if (unlikely(wc.byte_len > qp->r_len)) {
 404                         qp->r_reuse_sge = 1;
 405                         dev->n_pkt_drops++;
 406                         goto done;
 407                 }
 408                 /* XXX Need to free SGEs */
 409         last_imm:
 410                 ipath_copy_sge(&qp->r_sge, data, tlen);
 411                 wc.wr_id = qp->r_wr_id;
 412                 wc.status = IB_WC_SUCCESS;
 413                 wc.opcode = IB_WC_RECV;
 414                 wc.vendor_err = 0;
 415                 wc.qp = &qp->ibqp;
 416                 wc.src_qp = qp->remote_qpn;
 417                 wc.pkey_index = 0;
 418                 wc.slid = qp->remote_ah_attr.dlid;
 419                 wc.sl = qp->remote_ah_attr.sl;
 420                 wc.dlid_path_bits = 0;
 421                 wc.port_num = 0;
 422                 /* Signal completion event if the solicited bit is set. */
 423                 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
 424                                (ohdr->bth[0] &
 425                                 __constant_cpu_to_be32(1 << 23)) != 0);
 426                 break;
 427
 428         case OP(RDMA_WRITE_FIRST):
 429         case OP(RDMA_WRITE_ONLY):
 430         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 431         rdma_first:
 432                 /* RETH comes after BTH */
 433                 if (!header_in_data)
 434                         reth = &ohdr->u.rc.reth;
 435                 else {
 436                         reth = (struct ib_reth *)data;
 437                         data += sizeof(*reth);
 438                 }
 439                 hdrsize += sizeof(*reth);
 440                 qp->r_len = be32_to_cpu(reth->length);
 441                 qp->r_rcv_len = 0;
 442                 if (qp->r_len != 0) {
 443                         u32 rkey = be32_to_cpu(reth->rkey);
 444                         u64 vaddr = be64_to_cpu(reth->vaddr);
 445                         int ok;
 446
 447                         /* Check rkey */
 448                         ok = ipath_rkey_ok(qp, &qp->r_sge, qp->r_len,
 449                                            vaddr, rkey,
 450                                            IB_ACCESS_REMOTE_WRITE);
 451                         if (unlikely(!ok)) {
 452                                 dev->n_pkt_drops++;
 453                                 goto done;
 454                         }
 455                 } else {
 456                         qp->r_sge.sg_list = NULL;
 457                         qp->r_sge.sge.mr = NULL;
 458                         qp->r_sge.sge.vaddr = NULL;
 459                         qp->r_sge.sge.length = 0;
 460                         qp->r_sge.sge.sge_length = 0;
 461                 }
 462                 if (unlikely(!(qp->qp_access_flags &
 463                                IB_ACCESS_REMOTE_WRITE))) {
 464                         dev->n_pkt_drops++;
 465                         goto done;
 466                 }
 467                 if (opcode == OP(RDMA_WRITE_ONLY))
 468                         goto rdma_last;
 469                 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 470                         goto rdma_last_imm;
 471                 /* FALLTHROUGH */
 472         case OP(RDMA_WRITE_MIDDLE):
 473                 /* Check for invalid length PMTU or posted rwqe len. */
 474                 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
 475                         dev->n_pkt_drops++;
 476                         goto done;
 477                 }
 478                 qp->r_rcv_len += pmtu;
 479                 if (unlikely(qp->r_rcv_len > qp->r_len)) {
 480                         dev->n_pkt_drops++;
 481                         goto done;
 482                 }
 483                 ipath_copy_sge(&qp->r_sge, data, pmtu);
 484                 break;
 485
 486         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 487         rdma_last_imm:
 488                 /* Get the number of bytes the message was padded by. */
 489                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 490                 /* Check for invalid length. */
 491                 /* XXX LAST len should be >= 1 */
 492                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 493                         dev->n_pkt_drops++;
 494                         goto done;
 495                 }
 496                 /* Don't count the CRC. */
 497                 tlen -= (hdrsize + pad + 4);
 498                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
 499                         dev->n_pkt_drops++;
 500                         goto done;
 501                 }
 502                 if (qp->r_reuse_sge)
 503                         qp->r_reuse_sge = 0;
 504                 else if (!ipath_get_rwqe(qp, 1)) {
 505                         dev->n_pkt_drops++;
 506                         goto done;
 507                 }
 508                 if (header_in_data) {
 509                         wc.imm_data = *(__be32 *) data;
 510                         data += sizeof(__be32);
 511                 } else {
 512                         /* Immediate data comes after BTH */
 513                         wc.imm_data = ohdr->u.imm_data;
 514                 }
 515                 hdrsize += 4;
 516                 wc.wc_flags = IB_WC_WITH_IMM;
 517                 wc.byte_len = 0;
 518                 goto last_imm;
 519
 520         case OP(RDMA_WRITE_LAST):
 521         rdma_last:
 522                 /* Get the number of bytes the message was padded by. */
 523                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 524                 /* Check for invalid length. */
 525                 /* XXX LAST len should be >= 1 */
 526                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 527                         dev->n_pkt_drops++;
 528                         goto done;
 529                 }
 530                 /* Don't count the CRC. */
 531                 tlen -= (hdrsize + pad + 4);
 532                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
 533                         dev->n_pkt_drops++;
 534                         goto done;
 535                 }
 536                 ipath_copy_sge(&qp->r_sge, data, tlen);
 537                 break;
 538
 539         default:
 540                 /* Drop packet for unknown opcodes. */
 541                 dev->n_pkt_drops++;
 542                 goto done;
 543         }
 544         qp->r_psn++;
 545         qp->r_state = opcode;
 546 done:
 547         return;
 548 }