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  * @flags: unused
  44  *
  45  * Assumes the s_lock is held.
  46  *
  47  * Return 1 if constructed; otherwise, return 0.
  48  */
  49 int qib_make_uc_req(struct rvt_qp *qp, unsigned long *flags)
  50 {
  51         struct qib_qp_priv *priv = qp->priv;
  52         struct ib_other_headers *ohdr;
  53         struct rvt_swqe *wqe;
  54         u32 hwords;
  55         u32 bth0;
  56         u32 len;
  57         u32 pmtu = qp->pmtu;
  58         int ret = 0;
  59
  60         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
  61                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
  62                         goto bail;
  63                 /* We are in the error state, flush the work request. */
  64                 if (qp->s_last == READ_ONCE(qp->s_head))
  65                         goto bail;
  66                 /* If DMAs are in progress, we can't flush immediately. */
  67                 if (atomic_read(&priv->s_dma_busy)) {
  68                         qp->s_flags |= RVT_S_WAIT_DMA;
  69                         goto bail;
  70                 }
  71                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
  72                 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
  73                 goto done;
  74         }
  75
  76         ohdr = &priv->s_hdr->u.oth;
  77         if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
  78                 ohdr = &priv->s_hdr->u.l.oth;
  79
  80         /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  81         hwords = 5;
  82         bth0 = 0;
  83
  84         /* Get the next send request. */
  85         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
  86         qp->s_wqe = NULL;
  87         switch (qp->s_state) {
  88         default:
  89                 if (!(ib_rvt_state_ops[qp->state] &
  90                     RVT_PROCESS_NEXT_SEND_OK))
  91                         goto bail;
  92                 /* Check if send work queue is empty. */
  93                 if (qp->s_cur == READ_ONCE(qp->s_head))
  94                         goto bail;
  95                 /*
  96                  * Start a new request.
  97                  */
  98                 qp->s_psn = wqe->psn;
  99                 qp->s_sge.sge = wqe->sg_list[0];
 100                 qp->s_sge.sg_list = wqe->sg_list + 1;
 101                 qp->s_sge.num_sge = wqe->wr.num_sge;
 102                 qp->s_sge.total_len = wqe->length;
 103                 len = wqe->length;
 104                 qp->s_len = len;
 105                 switch (wqe->wr.opcode) {
 106                 case IB_WR_SEND:
 107                 case IB_WR_SEND_WITH_IMM:
 108                         if (len > pmtu) {
 109                                 qp->s_state = OP(SEND_FIRST);
 110                                 len = pmtu;
 111                                 break;
 112                         }
 113                         if (wqe->wr.opcode == IB_WR_SEND)
 114                                 qp->s_state = OP(SEND_ONLY);
 115                         else {
 116                                 qp->s_state =
 117                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 118                                 /* Immediate data comes after the BTH */
 119                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 120                                 hwords += 1;
 121                         }
 122                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 123                                 bth0 |= IB_BTH_SOLICITED;
 124                         qp->s_wqe = wqe;
 125                         if (++qp->s_cur >= qp->s_size)
 126                                 qp->s_cur = 0;
 127                         break;
 128
 129                 case IB_WR_RDMA_WRITE:
 130                 case IB_WR_RDMA_WRITE_WITH_IMM:
 131                         ohdr->u.rc.reth.vaddr =
 132                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 133                         ohdr->u.rc.reth.rkey =
 134                                 cpu_to_be32(wqe->rdma_wr.rkey);
 135                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 136                         hwords += sizeof(struct ib_reth) / 4;
 137                         if (len > pmtu) {
 138                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 139                                 len = pmtu;
 140                                 break;
 141                         }
 142                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 143                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 144                         else {
 145                                 qp->s_state =
 146                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 147                                 /* Immediate data comes after the RETH */
 148                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 149                                 hwords += 1;
 150                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 151                                         bth0 |= IB_BTH_SOLICITED;
 152                         }
 153                         qp->s_wqe = wqe;
 154                         if (++qp->s_cur >= qp->s_size)
 155                                 qp->s_cur = 0;
 156                         break;
 157
 158                 default:
 159                         goto bail;
 160                 }
 161                 break;
 162
 163         case OP(SEND_FIRST):
 164                 qp->s_state = OP(SEND_MIDDLE);
 165                 fallthrough;
 166         case OP(SEND_MIDDLE):
 167                 len = qp->s_len;
 168                 if (len > pmtu) {
 169                         len = pmtu;
 170                         break;
 171                 }
 172                 if (wqe->wr.opcode == IB_WR_SEND)
 173                         qp->s_state = OP(SEND_LAST);
 174                 else {
 175                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 176                         /* Immediate data comes after the BTH */
 177                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 178                         hwords += 1;
 179                 }
 180                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 181                         bth0 |= IB_BTH_SOLICITED;
 182                 qp->s_wqe = wqe;
 183                 if (++qp->s_cur >= qp->s_size)
 184                         qp->s_cur = 0;
 185                 break;
 186
 187         case OP(RDMA_WRITE_FIRST):
 188                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 189                 fallthrough;
 190         case OP(RDMA_WRITE_MIDDLE):
 191                 len = qp->s_len;
 192                 if (len > pmtu) {
 193                         len = pmtu;
 194                         break;
 195                 }
 196                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
 197                         qp->s_state = OP(RDMA_WRITE_LAST);
 198                 else {
 199                         qp->s_state =
 200                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 201                         /* Immediate data comes after the BTH */
 202                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 203                         hwords += 1;
 204                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 205                                 bth0 |= IB_BTH_SOLICITED;
 206                 }
 207                 qp->s_wqe = wqe;
 208                 if (++qp->s_cur >= qp->s_size)
 209                         qp->s_cur = 0;
 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         qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 217                             qp->s_psn++ & QIB_PSN_MASK);
 218 done:
 219         return 1;
 220 bail:
 221         qp->s_flags &= ~RVT_S_BUSY;
 222         return ret;
 223 }
 224
 225 /**
 226  * qib_uc_rcv - handle an incoming UC packet
 227  * @ibp: the port the packet came in on
 228  * @hdr: the header of the packet
 229  * @has_grh: true if the packet has a GRH
 230  * @data: the packet data
 231  * @tlen: the length of the packet
 232  * @qp: the QP for this packet.
 233  *
 234  * This is called from qib_qp_rcv() to process an incoming UC packet
 235  * for the given QP.
 236  * Called at interrupt level.
 237  */
 238 void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
 239                 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
 240 {
 241         struct ib_other_headers *ohdr;
 242         u32 opcode;
 243         u32 hdrsize;
 244         u32 psn;
 245         u32 pad;
 246         struct ib_wc wc;
 247         u32 pmtu = qp->pmtu;
 248         struct ib_reth *reth;
 249         int ret;
 250
 251         /* Check for GRH */
 252         if (!has_grh) {
 253                 ohdr = &hdr->u.oth;
 254                 hdrsize = 8 + 12;       /* LRH + BTH */
 255         } else {
 256                 ohdr = &hdr->u.l.oth;
 257                 hdrsize = 8 + 40 + 12;  /* LRH + GRH + BTH */
 258         }
 259
 260         opcode = be32_to_cpu(ohdr->bth[0]);
 261         if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
 262                 return;
 263
 264         psn = be32_to_cpu(ohdr->bth[2]);
 265         opcode >>= 24;
 266
 267         /* Compare the PSN verses the expected PSN. */
 268         if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
 269                 /*
 270                  * Handle a sequence error.
 271                  * Silently drop any current message.
 272                  */
 273                 qp->r_psn = psn;
 274 inv:
 275                 if (qp->r_state == OP(SEND_FIRST) ||
 276                     qp->r_state == OP(SEND_MIDDLE)) {
 277                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 278                         qp->r_sge.num_sge = 0;
 279                 } else
 280                         rvt_put_ss(&qp->r_sge);
 281                 qp->r_state = OP(SEND_LAST);
 282                 switch (opcode) {
 283                 case OP(SEND_FIRST):
 284                 case OP(SEND_ONLY):
 285                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 286                         goto send_first;
 287
 288                 case OP(RDMA_WRITE_FIRST):
 289                 case OP(RDMA_WRITE_ONLY):
 290                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 291                         goto rdma_first;
 292
 293                 default:
 294                         goto drop;
 295                 }
 296         }
 297
 298         /* Check for opcode sequence errors. */
 299         switch (qp->r_state) {
 300         case OP(SEND_FIRST):
 301         case OP(SEND_MIDDLE):
 302                 if (opcode == OP(SEND_MIDDLE) ||
 303                     opcode == OP(SEND_LAST) ||
 304                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 305                         break;
 306                 goto inv;
 307
 308         case OP(RDMA_WRITE_FIRST):
 309         case OP(RDMA_WRITE_MIDDLE):
 310                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 311                     opcode == OP(RDMA_WRITE_LAST) ||
 312                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 313                         break;
 314                 goto inv;
 315
 316         default:
 317                 if (opcode == OP(SEND_FIRST) ||
 318                     opcode == OP(SEND_ONLY) ||
 319                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 320                     opcode == OP(RDMA_WRITE_FIRST) ||
 321                     opcode == OP(RDMA_WRITE_ONLY) ||
 322                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 323                         break;
 324                 goto inv;
 325         }
 326
 327         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
 328                 rvt_comm_est(qp);
 329
 330         /* OK, process the packet. */
 331         switch (opcode) {
 332         case OP(SEND_FIRST):
 333         case OP(SEND_ONLY):
 334         case OP(SEND_ONLY_WITH_IMMEDIATE):
 335 send_first:
 336                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
 337                         qp->r_sge = qp->s_rdma_read_sge;
 338                 else {
 339                         ret = rvt_get_rwqe(qp, false);
 340                         if (ret < 0)
 341                                 goto op_err;
 342                         if (!ret)
 343                                 goto drop;
 344                         /*
 345                          * qp->s_rdma_read_sge will be the owner
 346                          * of the mr references.
 347                          */
 348                         qp->s_rdma_read_sge = qp->r_sge;
 349                 }
 350                 qp->r_rcv_len = 0;
 351                 if (opcode == OP(SEND_ONLY))
 352                         goto no_immediate_data;
 353                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 354                         goto send_last_imm;
 355                 fallthrough;
 356         case OP(SEND_MIDDLE):
 357                 /* Check for invalid length PMTU or posted rwqe len. */
 358                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 359                         goto rewind;
 360                 qp->r_rcv_len += pmtu;
 361                 if (unlikely(qp->r_rcv_len > qp->r_len))
 362                         goto rewind;
 363                 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
 364                 break;
 365
 366         case OP(SEND_LAST_WITH_IMMEDIATE):
 367 send_last_imm:
 368                 wc.ex.imm_data = ohdr->u.imm_data;
 369                 hdrsize += 4;
 370                 wc.wc_flags = IB_WC_WITH_IMM;
 371                 goto send_last;
 372         case OP(SEND_LAST):
 373 no_immediate_data:
 374                 wc.ex.imm_data = 0;
 375                 wc.wc_flags = 0;
 376 send_last:
 377                 /* Get the number of bytes the message was padded by. */
 378                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 379                 /* Check for invalid length. */
 380                 /* XXX LAST len should be >= 1 */
 381                 if (unlikely(tlen < (hdrsize + pad + 4)))
 382                         goto rewind;
 383                 /* Don't count the CRC. */
 384                 tlen -= (hdrsize + pad + 4);
 385                 wc.byte_len = tlen + qp->r_rcv_len;
 386                 if (unlikely(wc.byte_len > qp->r_len))
 387                         goto rewind;
 388                 wc.opcode = IB_WC_RECV;
 389                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
 390                 rvt_put_ss(&qp->s_rdma_read_sge);
 391 last_imm:
 392                 wc.wr_id = qp->r_wr_id;
 393                 wc.status = IB_WC_SUCCESS;
 394                 wc.qp = &qp->ibqp;
 395                 wc.src_qp = qp->remote_qpn;
 396                 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
 397                 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
 398                 /* zero fields that are N/A */
 399                 wc.vendor_err = 0;
 400                 wc.pkey_index = 0;
 401                 wc.dlid_path_bits = 0;
 402                 wc.port_num = 0;
 403                 /* Signal completion event if the solicited bit is set. */
 404                 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
 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                 if (unlikely(!(qp->qp_access_flags &
 412                                IB_ACCESS_REMOTE_WRITE))) {
 413                         goto drop;
 414                 }
 415                 reth = &ohdr->u.rc.reth;
 416                 hdrsize += sizeof(*reth);
 417                 qp->r_len = be32_to_cpu(reth->length);
 418                 qp->r_rcv_len = 0;
 419                 qp->r_sge.sg_list = NULL;
 420                 if (qp->r_len != 0) {
 421                         u32 rkey = be32_to_cpu(reth->rkey);
 422                         u64 vaddr = be64_to_cpu(reth->vaddr);
 423                         int ok;
 424
 425                         /* Check rkey */
 426                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 427                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 428                         if (unlikely(!ok))
 429                                 goto drop;
 430                         qp->r_sge.num_sge = 1;
 431                 } else {
 432                         qp->r_sge.num_sge = 0;
 433                         qp->r_sge.sge.mr = NULL;
 434                         qp->r_sge.sge.vaddr = NULL;
 435                         qp->r_sge.sge.length = 0;
 436                         qp->r_sge.sge.sge_length = 0;
 437                 }
 438                 if (opcode == OP(RDMA_WRITE_ONLY))
 439                         goto rdma_last;
 440                 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 441                         wc.ex.imm_data = ohdr->u.rc.imm_data;
 442                         goto rdma_last_imm;
 443                 }
 444                 fallthrough;
 445         case OP(RDMA_WRITE_MIDDLE):
 446                 /* Check for invalid length PMTU or posted rwqe len. */
 447                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 448                         goto drop;
 449                 qp->r_rcv_len += pmtu;
 450                 if (unlikely(qp->r_rcv_len > qp->r_len))
 451                         goto drop;
 452                 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
 453                 break;
 454
 455         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 456                 wc.ex.imm_data = ohdr->u.imm_data;
 457 rdma_last_imm:
 458                 hdrsize += 4;
 459                 wc.wc_flags = IB_WC_WITH_IMM;
 460
 461                 /* Get the number of bytes the message was padded by. */
 462                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 463                 /* Check for invalid length. */
 464                 /* XXX LAST len should be >= 1 */
 465                 if (unlikely(tlen < (hdrsize + pad + 4)))
 466                         goto drop;
 467                 /* Don't count the CRC. */
 468                 tlen -= (hdrsize + pad + 4);
 469                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 470                         goto drop;
 471                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags))
 472                         rvt_put_ss(&qp->s_rdma_read_sge);
 473                 else {
 474                         ret = rvt_get_rwqe(qp, true);
 475                         if (ret < 0)
 476                                 goto op_err;
 477                         if (!ret)
 478                                 goto drop;
 479                 }
 480                 wc.byte_len = qp->r_len;
 481                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 482                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
 483                 rvt_put_ss(&qp->r_sge);
 484                 goto last_imm;
 485
 486         case OP(RDMA_WRITE_LAST):
 487 rdma_last:
 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                         goto drop;
 494                 /* Don't count the CRC. */
 495                 tlen -= (hdrsize + pad + 4);
 496                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 497                         goto drop;
 498                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
 499                 rvt_put_ss(&qp->r_sge);
 500                 break;
 501
 502         default:
 503                 /* Drop packet for unknown opcodes. */
 504                 goto drop;
 505         }
 506         qp->r_psn++;
 507         qp->r_state = opcode;
 508         return;
 509
 510 rewind:
 511         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 512         qp->r_sge.num_sge = 0;
 513 drop:
 514         ibp->rvp.n_pkt_drops++;
 515         return;
 516
 517 op_err:
 518         rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 519         return;
 520
 521 }