drivers/infiniband/hw/ipath/ipath_uc.c

   1 /*
   2  * Copyright (c) 2006, 2007 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         u32 hwords;
  51         u32 bth0;
  52         u32 len;
  53         u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
  54         int ret = 0;
  55
  56         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK))
  57                 goto done;
  58
  59         ohdr = &qp->s_hdr.u.oth;
  60         if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
  61                 ohdr = &qp->s_hdr.u.l.oth;
  62
  63         /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  64         hwords = 5;
  65         bth0 = 1 << 22; /* Set M bit */
  66
  67         /* Get the next send request. */
  68         wqe = get_swqe_ptr(qp, qp->s_cur);
  69         qp->s_wqe = NULL;
  70         switch (qp->s_state) {
  71         default:
  72                 /* Check if send work queue is empty. */
  73                 if (qp->s_cur == qp->s_head)
  74                         goto done;
  75                 /*
  76                  * Start a new request.
  77                  */
  78                 qp->s_psn = wqe->psn = qp->s_next_psn;
  79                 qp->s_sge.sge = wqe->sg_list[0];
  80                 qp->s_sge.sg_list = wqe->sg_list + 1;
  81                 qp->s_sge.num_sge = wqe->wr.num_sge;
  82                 qp->s_len = len = wqe->length;
  83                 switch (wqe->wr.opcode) {
  84                 case IB_WR_SEND:
  85                 case IB_WR_SEND_WITH_IMM:
  86                         if (len > pmtu) {
  87                                 qp->s_state = OP(SEND_FIRST);
  88                                 len = pmtu;
  89                                 break;
  90                         }
  91                         if (wqe->wr.opcode == IB_WR_SEND)
  92                                 qp->s_state = OP(SEND_ONLY);
  93                         else {
  94                                 qp->s_state =
  95                                         OP(SEND_ONLY_WITH_IMMEDIATE);
  96                                 /* Immediate data comes after the BTH */
  97                                 ohdr->u.imm_data = wqe->wr.imm_data;
  98                                 hwords += 1;
  99                         }
 100                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 101                                 bth0 |= 1 << 23;
 102                         qp->s_wqe = wqe;
 103                         if (++qp->s_cur >= qp->s_size)
 104                                 qp->s_cur = 0;
 105                         break;
 106
 107                 case IB_WR_RDMA_WRITE:
 108                 case IB_WR_RDMA_WRITE_WITH_IMM:
 109                         ohdr->u.rc.reth.vaddr =
 110                                 cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
 111                         ohdr->u.rc.reth.rkey =
 112                                 cpu_to_be32(wqe->wr.wr.rdma.rkey);
 113                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 114                         hwords += sizeof(struct ib_reth) / 4;
 115                         if (len > pmtu) {
 116                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 117                                 len = pmtu;
 118                                 break;
 119                         }
 120                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 121                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 122                         else {
 123                                 qp->s_state =
 124                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 125                                 /* Immediate data comes after the RETH */
 126                                 ohdr->u.rc.imm_data = wqe->wr.imm_data;
 127                                 hwords += 1;
 128                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 129                                         bth0 |= 1 << 23;
 130                         }
 131                         qp->s_wqe = wqe;
 132                         if (++qp->s_cur >= qp->s_size)
 133                                 qp->s_cur = 0;
 134                         break;
 135
 136                 default:
 137                         goto done;
 138                 }
 139                 break;
 140
 141         case OP(SEND_FIRST):
 142                 qp->s_state = OP(SEND_MIDDLE);
 143                 /* FALLTHROUGH */
 144         case OP(SEND_MIDDLE):
 145                 len = qp->s_len;
 146                 if (len > pmtu) {
 147                         len = pmtu;
 148                         break;
 149                 }
 150                 if (wqe->wr.opcode == IB_WR_SEND)
 151                         qp->s_state = OP(SEND_LAST);
 152                 else {
 153                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 154                         /* Immediate data comes after the BTH */
 155                         ohdr->u.imm_data = wqe->wr.imm_data;
 156                         hwords += 1;
 157                 }
 158                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 159                         bth0 |= 1 << 23;
 160                 qp->s_wqe = wqe;
 161                 if (++qp->s_cur >= qp->s_size)
 162                         qp->s_cur = 0;
 163                 break;
 164
 165         case OP(RDMA_WRITE_FIRST):
 166                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 167                 /* FALLTHROUGH */
 168         case OP(RDMA_WRITE_MIDDLE):
 169                 len = qp->s_len;
 170                 if (len > pmtu) {
 171                         len = pmtu;
 172                         break;
 173                 }
 174                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 175                         qp->s_state = OP(RDMA_WRITE_LAST);
 176                 else {
 177                         qp->s_state =
 178                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 179                         /* Immediate data comes after the BTH */
 180                         ohdr->u.imm_data = wqe->wr.imm_data;
 181                         hwords += 1;
 182                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 183                                 bth0 |= 1 << 23;
 184                 }
 185                 qp->s_wqe = wqe;
 186                 if (++qp->s_cur >= qp->s_size)
 187                         qp->s_cur = 0;
 188                 break;
 189         }
 190         qp->s_len -= len;
 191         qp->s_hdrwords = hwords;
 192         qp->s_cur_sge = &qp->s_sge;
 193         qp->s_cur_size = len;
 194         ipath_make_ruc_header(to_idev(qp->ibqp.device),
 195                               qp, ohdr, bth0 | (qp->s_state << 24),
 196                               qp->s_next_psn++ & IPATH_PSN_MASK);
 197         ret = 1;
 198
 199 done:
 200         return ret;
 201 }
 202
 203 /**
 204  * ipath_uc_rcv - handle an incoming UC packet
 205  * @dev: the device the packet came in on
 206  * @hdr: the header of the packet
 207  * @has_grh: true if the packet has a GRH
 208  * @data: the packet data
 209  * @tlen: the length of the packet
 210  * @qp: the QP for this packet.
 211  *
 212  * This is called from ipath_qp_rcv() to process an incoming UC packet
 213  * for the given QP.
 214  * Called at interrupt level.
 215  */
 216 void ipath_uc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
 217                   int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
 218 {
 219         struct ipath_other_headers *ohdr;
 220         int opcode;
 221         u32 hdrsize;
 222         u32 psn;
 223         u32 pad;
 224         struct ib_wc wc;
 225         u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
 226         struct ib_reth *reth;
 227         int header_in_data;
 228
 229         /* Validate the SLID. See Ch. 9.6.1.5 */
 230         if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
 231                 goto done;
 232
 233         /* Check for GRH */
 234         if (!has_grh) {
 235                 ohdr = &hdr->u.oth;
 236                 hdrsize = 8 + 12;       /* LRH + BTH */
 237                 psn = be32_to_cpu(ohdr->bth[2]);
 238                 header_in_data = 0;
 239         } else {
 240                 ohdr = &hdr->u.l.oth;
 241                 hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
 242                 /*
 243                  * The header with GRH is 60 bytes and the
 244                  * core driver sets the eager header buffer
 245                  * size to 56 bytes so the last 4 bytes of
 246                  * the BTH header (PSN) is in the data buffer.
 247                  */
 248                 header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
 249                 if (header_in_data) {
 250                         psn = be32_to_cpu(((__be32 *) data)[0]);
 251                         data += sizeof(__be32);
 252                 } else
 253                         psn = be32_to_cpu(ohdr->bth[2]);
 254         }
 255         /*
 256          * The opcode is in the low byte when its in network order
 257          * (top byte when in host order).
 258          */
 259         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 260
 261         wc.imm_data = 0;
 262         wc.wc_flags = 0;
 263
 264         /* Compare the PSN verses the expected PSN. */
 265         if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
 266                 /*
 267                  * Handle a sequence error.
 268                  * Silently drop any current message.
 269                  */
 270                 qp->r_psn = psn;
 271         inv:
 272                 qp->r_state = OP(SEND_LAST);
 273                 switch (opcode) {
 274                 case OP(SEND_FIRST):
 275                 case OP(SEND_ONLY):
 276                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 277                         goto send_first;
 278
 279                 case OP(RDMA_WRITE_FIRST):
 280                 case OP(RDMA_WRITE_ONLY):
 281                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 282                         goto rdma_first;
 283
 284                 default:
 285                         dev->n_pkt_drops++;
 286                         goto done;
 287                 }
 288         }
 289
 290         /* Check for opcode sequence errors. */
 291         switch (qp->r_state) {
 292         case OP(SEND_FIRST):
 293         case OP(SEND_MIDDLE):
 294                 if (opcode == OP(SEND_MIDDLE) ||
 295                     opcode == OP(SEND_LAST) ||
 296                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 297                         break;
 298                 goto inv;
 299
 300         case OP(RDMA_WRITE_FIRST):
 301         case OP(RDMA_WRITE_MIDDLE):
 302                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 303                     opcode == OP(RDMA_WRITE_LAST) ||
 304                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 305                         break;
 306                 goto inv;
 307
 308         default:
 309                 if (opcode == OP(SEND_FIRST) ||
 310                     opcode == OP(SEND_ONLY) ||
 311                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 312                     opcode == OP(RDMA_WRITE_FIRST) ||
 313                     opcode == OP(RDMA_WRITE_ONLY) ||
 314                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 315                         break;
 316                 goto inv;
 317         }
 318
 319         /* OK, process the packet. */
 320         switch (opcode) {
 321         case OP(SEND_FIRST):
 322         case OP(SEND_ONLY):
 323         case OP(SEND_ONLY_WITH_IMMEDIATE):
 324         send_first:
 325                 if (qp->r_reuse_sge) {
 326                         qp->r_reuse_sge = 0;
 327                         qp->r_sge = qp->s_rdma_read_sge;
 328                 } else if (!ipath_get_rwqe(qp, 0)) {
 329                         dev->n_pkt_drops++;
 330                         goto done;
 331                 }
 332                 /* Save the WQE so we can reuse it in case of an error. */
 333                 qp->s_rdma_read_sge = qp->r_sge;
 334                 qp->r_rcv_len = 0;
 335                 if (opcode == OP(SEND_ONLY))
 336                         goto send_last;
 337                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 338                         goto send_last_imm;
 339                 /* FALLTHROUGH */
 340         case OP(SEND_MIDDLE):
 341                 /* Check for invalid length PMTU or posted rwqe len. */
 342                 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
 343                         qp->r_reuse_sge = 1;
 344                         dev->n_pkt_drops++;
 345                         goto done;
 346                 }
 347                 qp->r_rcv_len += pmtu;
 348                 if (unlikely(qp->r_rcv_len > qp->r_len)) {
 349                         qp->r_reuse_sge = 1;
 350                         dev->n_pkt_drops++;
 351                         goto done;
 352                 }
 353                 ipath_copy_sge(&qp->r_sge, data, pmtu);
 354                 break;
 355
 356         case OP(SEND_LAST_WITH_IMMEDIATE):
 357         send_last_imm:
 358                 if (header_in_data) {
 359                         wc.imm_data = *(__be32 *) data;
 360                         data += sizeof(__be32);
 361                 } else {
 362                         /* Immediate data comes after BTH */
 363                         wc.imm_data = ohdr->u.imm_data;
 364                 }
 365                 hdrsize += 4;
 366                 wc.wc_flags = IB_WC_WITH_IMM;
 367                 /* FALLTHROUGH */
 368         case OP(SEND_LAST):
 369         send_last:
 370                 /* Get the number of bytes the message was padded by. */
 371                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 372                 /* Check for invalid length. */
 373                 /* XXX LAST len should be >= 1 */
 374                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 375                         qp->r_reuse_sge = 1;
 376                         dev->n_pkt_drops++;
 377                         goto done;
 378                 }
 379                 /* Don't count the CRC. */
 380                 tlen -= (hdrsize + pad + 4);
 381                 wc.byte_len = tlen + qp->r_rcv_len;
 382                 if (unlikely(wc.byte_len > qp->r_len)) {
 383                         qp->r_reuse_sge = 1;
 384                         dev->n_pkt_drops++;
 385                         goto done;
 386                 }
 387                 /* XXX Need to free SGEs */
 388         last_imm:
 389                 ipath_copy_sge(&qp->r_sge, data, tlen);
 390                 wc.wr_id = qp->r_wr_id;
 391                 wc.status = IB_WC_SUCCESS;
 392                 wc.opcode = IB_WC_RECV;
 393                 wc.vendor_err = 0;
 394                 wc.qp = &qp->ibqp;
 395                 wc.src_qp = qp->remote_qpn;
 396                 wc.pkey_index = 0;
 397                 wc.slid = qp->remote_ah_attr.dlid;
 398                 wc.sl = qp->remote_ah_attr.sl;
 399                 wc.dlid_path_bits = 0;
 400                 wc.port_num = 0;
 401                 /* Signal completion event if the solicited bit is set. */
 402                 ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
 403                                (ohdr->bth[0] &
 404                                 __constant_cpu_to_be32(1 << 23)) != 0);
 405                 break;
 406
 407         case OP(RDMA_WRITE_FIRST):
 408         case OP(RDMA_WRITE_ONLY):
 409         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 410         rdma_first:
 411                 /* RETH comes after BTH */
 412                 if (!header_in_data)
 413                         reth = &ohdr->u.rc.reth;
 414                 else {
 415                         reth = (struct ib_reth *)data;
 416                         data += sizeof(*reth);
 417                 }
 418                 hdrsize += sizeof(*reth);
 419                 qp->r_len = be32_to_cpu(reth->length);
 420                 qp->r_rcv_len = 0;
 421                 if (qp->r_len != 0) {
 422                         u32 rkey = be32_to_cpu(reth->rkey);
 423                         u64 vaddr = be64_to_cpu(reth->vaddr);
 424                         int ok;
 425
 426                         /* Check rkey */
 427                         ok = ipath_rkey_ok(qp, &qp->r_sge, qp->r_len,
 428                                            vaddr, rkey,
 429                                            IB_ACCESS_REMOTE_WRITE);
 430                         if (unlikely(!ok)) {
 431                                 dev->n_pkt_drops++;
 432                                 goto done;
 433                         }
 434                 } else {
 435                         qp->r_sge.sg_list = NULL;
 436                         qp->r_sge.sge.mr = NULL;
 437                         qp->r_sge.sge.vaddr = NULL;
 438                         qp->r_sge.sge.length = 0;
 439                         qp->r_sge.sge.sge_length = 0;
 440                 }
 441                 if (unlikely(!(qp->qp_access_flags &
 442                                IB_ACCESS_REMOTE_WRITE))) {
 443                         dev->n_pkt_drops++;
 444                         goto done;
 445                 }
 446                 if (opcode == OP(RDMA_WRITE_ONLY))
 447                         goto rdma_last;
 448                 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 449                         goto rdma_last_imm;
 450                 /* FALLTHROUGH */
 451         case OP(RDMA_WRITE_MIDDLE):
 452                 /* Check for invalid length PMTU or posted rwqe len. */
 453                 if (unlikely(tlen != (hdrsize + pmtu + 4))) {
 454                         dev->n_pkt_drops++;
 455                         goto done;
 456                 }
 457                 qp->r_rcv_len += pmtu;
 458                 if (unlikely(qp->r_rcv_len > qp->r_len)) {
 459                         dev->n_pkt_drops++;
 460                         goto done;
 461                 }
 462                 ipath_copy_sge(&qp->r_sge, data, pmtu);
 463                 break;
 464
 465         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 466         rdma_last_imm:
 467                 if (header_in_data) {
 468                         wc.imm_data = *(__be32 *) data;
 469                         data += sizeof(__be32);
 470                 } else {
 471                         /* Immediate data comes after BTH */
 472                         wc.imm_data = ohdr->u.imm_data;
 473                 }
 474                 hdrsize += 4;
 475                 wc.wc_flags = IB_WC_WITH_IMM;
 476
 477                 /* Get the number of bytes the message was padded by. */
 478                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 479                 /* Check for invalid length. */
 480                 /* XXX LAST len should be >= 1 */
 481                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 482                         dev->n_pkt_drops++;
 483                         goto done;
 484                 }
 485                 /* Don't count the CRC. */
 486                 tlen -= (hdrsize + pad + 4);
 487                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
 488                         dev->n_pkt_drops++;
 489                         goto done;
 490                 }
 491                 if (qp->r_reuse_sge)
 492                         qp->r_reuse_sge = 0;
 493                 else if (!ipath_get_rwqe(qp, 1)) {
 494                         dev->n_pkt_drops++;
 495                         goto done;
 496                 }
 497                 wc.byte_len = qp->r_len;
 498                 goto last_imm;
 499
 500         case OP(RDMA_WRITE_LAST):
 501         rdma_last:
 502                 /* Get the number of bytes the message was padded by. */
 503                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 504                 /* Check for invalid length. */
 505                 /* XXX LAST len should be >= 1 */
 506                 if (unlikely(tlen < (hdrsize + pad + 4))) {
 507                         dev->n_pkt_drops++;
 508                         goto done;
 509                 }
 510                 /* Don't count the CRC. */
 511                 tlen -= (hdrsize + pad + 4);
 512                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) {
 513                         dev->n_pkt_drops++;
 514                         goto done;
 515                 }
 516                 ipath_copy_sge(&qp->r_sge, data, tlen);
 517                 break;
 518
 519         default:
 520                 /* Drop packet for unknown opcodes. */
 521                 dev->n_pkt_drops++;
 522                 goto done;
 523         }
 524         qp->r_psn++;
 525         qp->r_state = opcode;
 526 done:
 527         return;
 528 }