drivers/infiniband/hw/hfi1/uc.c

   1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
   2 /*
   3  * Copyright(c) 2015 - 2018 Intel Corporation.
   4  */
   5
   6 #include "hfi.h"
   7 #include "verbs_txreq.h"
   8 #include "qp.h"
   9
  10 /* cut down ridiculously long IB macro names */
  11 #define OP(x) UC_OP(x)
  12
  13 /**
  14  * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
  15  * @qp: a pointer to the QP
  16  * @ps: the current packet state
  17  *
  18  * Assume s_lock is held.
  19  *
  20  * Return 1 if constructed; otherwise, return 0.
  21  */
  22 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
  23 {
  24         struct hfi1_qp_priv *priv = qp->priv;
  25         struct ib_other_headers *ohdr;
  26         struct rvt_swqe *wqe;
  27         u32 hwords;
  28         u32 bth0 = 0;
  29         u32 len;
  30         u32 pmtu = qp->pmtu;
  31         int middle = 0;
  32
  33         ps->s_txreq = get_txreq(ps->dev, qp);
  34         if (!ps->s_txreq)
  35                 goto bail_no_tx;
  36
  37         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
  38                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
  39                         goto bail;
  40                 /* We are in the error state, flush the work request. */
  41                 if (qp->s_last == READ_ONCE(qp->s_head))
  42                         goto bail;
  43                 /* If DMAs are in progress, we can't flush immediately. */
  44                 if (iowait_sdma_pending(&priv->s_iowait)) {
  45                         qp->s_flags |= RVT_S_WAIT_DMA;
  46                         goto bail;
  47                 }
  48                 clear_ahg(qp);
  49                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
  50                 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
  51                 goto done_free_tx;
  52         }
  53
  54         if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
  55                 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  56                 hwords = 5;
  57                 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
  58                         ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
  59                 else
  60                         ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
  61         } else {
  62                 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
  63                 hwords = 7;
  64                 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
  65                     (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
  66                         ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
  67                 else
  68                         ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
  69         }
  70
  71         /* Get the next send request. */
  72         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
  73         qp->s_wqe = NULL;
  74         switch (qp->s_state) {
  75         default:
  76                 if (!(ib_rvt_state_ops[qp->state] &
  77                     RVT_PROCESS_NEXT_SEND_OK))
  78                         goto bail;
  79                 /* Check if send work queue is empty. */
  80                 if (qp->s_cur == READ_ONCE(qp->s_head)) {
  81                         clear_ahg(qp);
  82                         goto bail;
  83                 }
  84                 /*
  85                  * Local operations are processed immediately
  86                  * after all prior requests have completed.
  87                  */
  88                 if (wqe->wr.opcode == IB_WR_REG_MR ||
  89                     wqe->wr.opcode == IB_WR_LOCAL_INV) {
  90                         int local_ops = 0;
  91                         int err = 0;
  92
  93                         if (qp->s_last != qp->s_cur)
  94                                 goto bail;
  95                         if (++qp->s_cur == qp->s_size)
  96                                 qp->s_cur = 0;
  97                         if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
  98                                 err = rvt_invalidate_rkey(
  99                                         qp, wqe->wr.ex.invalidate_rkey);
 100                                 local_ops = 1;
 101                         }
 102                         rvt_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR
 103                                                         : IB_WC_SUCCESS);
 104                         if (local_ops)
 105                                 atomic_dec(&qp->local_ops_pending);
 106                         goto done_free_tx;
 107                 }
 108                 /*
 109                  * Start a new request.
 110                  */
 111                 qp->s_psn = wqe->psn;
 112                 qp->s_sge.sge = wqe->sg_list[0];
 113                 qp->s_sge.sg_list = wqe->sg_list + 1;
 114                 qp->s_sge.num_sge = wqe->wr.num_sge;
 115                 qp->s_sge.total_len = wqe->length;
 116                 len = wqe->length;
 117                 qp->s_len = len;
 118                 switch (wqe->wr.opcode) {
 119                 case IB_WR_SEND:
 120                 case IB_WR_SEND_WITH_IMM:
 121                         if (len > pmtu) {
 122                                 qp->s_state = OP(SEND_FIRST);
 123                                 len = pmtu;
 124                                 break;
 125                         }
 126                         if (wqe->wr.opcode == IB_WR_SEND) {
 127                                 qp->s_state = OP(SEND_ONLY);
 128                         } else {
 129                                 qp->s_state =
 130                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 131                                 /* Immediate data comes after the BTH */
 132                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 133                                 hwords += 1;
 134                         }
 135                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 136                                 bth0 |= IB_BTH_SOLICITED;
 137                         qp->s_wqe = wqe;
 138                         if (++qp->s_cur >= qp->s_size)
 139                                 qp->s_cur = 0;
 140                         break;
 141
 142                 case IB_WR_RDMA_WRITE:
 143                 case IB_WR_RDMA_WRITE_WITH_IMM:
 144                         ohdr->u.rc.reth.vaddr =
 145                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 146                         ohdr->u.rc.reth.rkey =
 147                                 cpu_to_be32(wqe->rdma_wr.rkey);
 148                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 149                         hwords += sizeof(struct ib_reth) / 4;
 150                         if (len > pmtu) {
 151                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 152                                 len = pmtu;
 153                                 break;
 154                         }
 155                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 156                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 157                         } else {
 158                                 qp->s_state =
 159                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 160                                 /* Immediate data comes after the RETH */
 161                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 162                                 hwords += 1;
 163                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 164                                         bth0 |= IB_BTH_SOLICITED;
 165                         }
 166                         qp->s_wqe = wqe;
 167                         if (++qp->s_cur >= qp->s_size)
 168                                 qp->s_cur = 0;
 169                         break;
 170
 171                 default:
 172                         goto bail;
 173                 }
 174                 break;
 175
 176         case OP(SEND_FIRST):
 177                 qp->s_state = OP(SEND_MIDDLE);
 178                 fallthrough;
 179         case OP(SEND_MIDDLE):
 180                 len = qp->s_len;
 181                 if (len > pmtu) {
 182                         len = pmtu;
 183                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 184                         break;
 185                 }
 186                 if (wqe->wr.opcode == IB_WR_SEND) {
 187                         qp->s_state = OP(SEND_LAST);
 188                 } else {
 189                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 190                         /* Immediate data comes after the BTH */
 191                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 192                         hwords += 1;
 193                 }
 194                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 195                         bth0 |= IB_BTH_SOLICITED;
 196                 qp->s_wqe = wqe;
 197                 if (++qp->s_cur >= qp->s_size)
 198                         qp->s_cur = 0;
 199                 break;
 200
 201         case OP(RDMA_WRITE_FIRST):
 202                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 203                 fallthrough;
 204         case OP(RDMA_WRITE_MIDDLE):
 205                 len = qp->s_len;
 206                 if (len > pmtu) {
 207                         len = pmtu;
 208                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 209                         break;
 210                 }
 211                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 212                         qp->s_state = OP(RDMA_WRITE_LAST);
 213                 } else {
 214                         qp->s_state =
 215                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 216                         /* Immediate data comes after the BTH */
 217                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 218                         hwords += 1;
 219                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 220                                 bth0 |= IB_BTH_SOLICITED;
 221                 }
 222                 qp->s_wqe = wqe;
 223                 if (++qp->s_cur >= qp->s_size)
 224                         qp->s_cur = 0;
 225                 break;
 226         }
 227         qp->s_len -= len;
 228         ps->s_txreq->hdr_dwords = hwords;
 229         ps->s_txreq->sde = priv->s_sde;
 230         ps->s_txreq->ss = &qp->s_sge;
 231         ps->s_txreq->s_cur_size = len;
 232         hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 233                              qp->remote_qpn, mask_psn(qp->s_psn++),
 234                              middle, ps);
 235         return 1;
 236
 237 done_free_tx:
 238         hfi1_put_txreq(ps->s_txreq);
 239         ps->s_txreq = NULL;
 240         return 1;
 241
 242 bail:
 243         hfi1_put_txreq(ps->s_txreq);
 244
 245 bail_no_tx:
 246         ps->s_txreq = NULL;
 247         qp->s_flags &= ~RVT_S_BUSY;
 248         return 0;
 249 }
 250
 251 /**
 252  * hfi1_uc_rcv - handle an incoming UC packet
 253  * @packet: the packet structure
 254  *
 255  * This is called from qp_rcv() to process an incoming UC packet
 256  * for the given QP.
 257  * Called at interrupt level.
 258  */
 259 void hfi1_uc_rcv(struct hfi1_packet *packet)
 260 {
 261         struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
 262         void *data = packet->payload;
 263         u32 tlen = packet->tlen;
 264         struct rvt_qp *qp = packet->qp;
 265         struct ib_other_headers *ohdr = packet->ohdr;
 266         u32 opcode = packet->opcode;
 267         u32 hdrsize = packet->hlen;
 268         u32 psn;
 269         u32 pad = packet->pad;
 270         struct ib_wc wc;
 271         u32 pmtu = qp->pmtu;
 272         struct ib_reth *reth;
 273         int ret;
 274         u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
 275
 276         if (hfi1_ruc_check_hdr(ibp, packet))
 277                 return;
 278
 279         process_ecn(qp, packet);
 280
 281         psn = ib_bth_get_psn(ohdr);
 282         /* Compare the PSN verses the expected PSN. */
 283         if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
 284                 /*
 285                  * Handle a sequence error.
 286                  * Silently drop any current message.
 287                  */
 288                 qp->r_psn = psn;
 289 inv:
 290                 if (qp->r_state == OP(SEND_FIRST) ||
 291                     qp->r_state == OP(SEND_MIDDLE)) {
 292                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 293                         qp->r_sge.num_sge = 0;
 294                 } else {
 295                         rvt_put_ss(&qp->r_sge);
 296                 }
 297                 qp->r_state = OP(SEND_LAST);
 298                 switch (opcode) {
 299                 case OP(SEND_FIRST):
 300                 case OP(SEND_ONLY):
 301                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 302                         goto send_first;
 303
 304                 case OP(RDMA_WRITE_FIRST):
 305                 case OP(RDMA_WRITE_ONLY):
 306                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 307                         goto rdma_first;
 308
 309                 default:
 310                         goto drop;
 311                 }
 312         }
 313
 314         /* Check for opcode sequence errors. */
 315         switch (qp->r_state) {
 316         case OP(SEND_FIRST):
 317         case OP(SEND_MIDDLE):
 318                 if (opcode == OP(SEND_MIDDLE) ||
 319                     opcode == OP(SEND_LAST) ||
 320                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 321                         break;
 322                 goto inv;
 323
 324         case OP(RDMA_WRITE_FIRST):
 325         case OP(RDMA_WRITE_MIDDLE):
 326                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 327                     opcode == OP(RDMA_WRITE_LAST) ||
 328                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 329                         break;
 330                 goto inv;
 331
 332         default:
 333                 if (opcode == OP(SEND_FIRST) ||
 334                     opcode == OP(SEND_ONLY) ||
 335                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 336                     opcode == OP(RDMA_WRITE_FIRST) ||
 337                     opcode == OP(RDMA_WRITE_ONLY) ||
 338                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 339                         break;
 340                 goto inv;
 341         }
 342
 343         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
 344                 rvt_comm_est(qp);
 345
 346         /* OK, process the packet. */
 347         switch (opcode) {
 348         case OP(SEND_FIRST):
 349         case OP(SEND_ONLY):
 350         case OP(SEND_ONLY_WITH_IMMEDIATE):
 351 send_first:
 352                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 353                         qp->r_sge = qp->s_rdma_read_sge;
 354                 } else {
 355                         ret = rvt_get_rwqe(qp, false);
 356                         if (ret < 0)
 357                                 goto op_err;
 358                         if (!ret)
 359                                 goto drop;
 360                         /*
 361                          * qp->s_rdma_read_sge will be the owner
 362                          * of the mr references.
 363                          */
 364                         qp->s_rdma_read_sge = qp->r_sge;
 365                 }
 366                 qp->r_rcv_len = 0;
 367                 if (opcode == OP(SEND_ONLY))
 368                         goto no_immediate_data;
 369                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 370                         goto send_last_imm;
 371                 fallthrough;
 372         case OP(SEND_MIDDLE):
 373                 /* Check for invalid length PMTU or posted rwqe len. */
 374                 /*
 375                  * There will be no padding for 9B packet but 16B packets
 376                  * will come in with some padding since we always add
 377                  * CRC and LT bytes which will need to be flit aligned
 378                  */
 379                 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
 380                         goto rewind;
 381                 qp->r_rcv_len += pmtu;
 382                 if (unlikely(qp->r_rcv_len > qp->r_len))
 383                         goto rewind;
 384                 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, false, false);
 385                 break;
 386
 387         case OP(SEND_LAST_WITH_IMMEDIATE):
 388 send_last_imm:
 389                 wc.ex.imm_data = ohdr->u.imm_data;
 390                 wc.wc_flags = IB_WC_WITH_IMM;
 391                 goto send_last;
 392         case OP(SEND_LAST):
 393 no_immediate_data:
 394                 wc.ex.imm_data = 0;
 395                 wc.wc_flags = 0;
 396 send_last:
 397                 /* Check for invalid length. */
 398                 /* LAST len should be >= 1 */
 399                 if (unlikely(tlen < (hdrsize + extra_bytes)))
 400                         goto rewind;
 401                 /* Don't count the CRC. */
 402                 tlen -= (hdrsize + extra_bytes);
 403                 wc.byte_len = tlen + qp->r_rcv_len;
 404                 if (unlikely(wc.byte_len > qp->r_len))
 405                         goto rewind;
 406                 wc.opcode = IB_WC_RECV;
 407                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, false, false);
 408                 rvt_put_ss(&qp->s_rdma_read_sge);
 409 last_imm:
 410                 wc.wr_id = qp->r_wr_id;
 411                 wc.status = IB_WC_SUCCESS;
 412                 wc.qp = &qp->ibqp;
 413                 wc.src_qp = qp->remote_qpn;
 414                 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
 415                 /*
 416                  * It seems that IB mandates the presence of an SL in a
 417                  * work completion only for the UD transport (see section
 418                  * 11.4.2 of IBTA Vol. 1).
 419                  *
 420                  * However, the way the SL is chosen below is consistent
 421                  * with the way that IB/qib works and is trying avoid
 422                  * introducing incompatibilities.
 423                  *
 424                  * See also OPA Vol. 1, section 9.7.6, and table 9-17.
 425                  */
 426                 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
 427                 /* zero fields that are N/A */
 428                 wc.vendor_err = 0;
 429                 wc.pkey_index = 0;
 430                 wc.dlid_path_bits = 0;
 431                 wc.port_num = 0;
 432                 /* Signal completion event if the solicited bit is set. */
 433                 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
 434                 break;
 435
 436         case OP(RDMA_WRITE_FIRST):
 437         case OP(RDMA_WRITE_ONLY):
 438         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 439 rdma_first:
 440                 if (unlikely(!(qp->qp_access_flags &
 441                                IB_ACCESS_REMOTE_WRITE))) {
 442                         goto drop;
 443                 }
 444                 reth = &ohdr->u.rc.reth;
 445                 qp->r_len = be32_to_cpu(reth->length);
 446                 qp->r_rcv_len = 0;
 447                 qp->r_sge.sg_list = NULL;
 448                 if (qp->r_len != 0) {
 449                         u32 rkey = be32_to_cpu(reth->rkey);
 450                         u64 vaddr = be64_to_cpu(reth->vaddr);
 451                         int ok;
 452
 453                         /* Check rkey */
 454                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 455                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 456                         if (unlikely(!ok))
 457                                 goto drop;
 458                         qp->r_sge.num_sge = 1;
 459                 } else {
 460                         qp->r_sge.num_sge = 0;
 461                         qp->r_sge.sge.mr = NULL;
 462                         qp->r_sge.sge.vaddr = NULL;
 463                         qp->r_sge.sge.length = 0;
 464                         qp->r_sge.sge.sge_length = 0;
 465                 }
 466                 if (opcode == OP(RDMA_WRITE_ONLY)) {
 467                         goto rdma_last;
 468                 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 469                         wc.ex.imm_data = ohdr->u.rc.imm_data;
 470                         goto rdma_last_imm;
 471                 }
 472                 fallthrough;
 473         case OP(RDMA_WRITE_MIDDLE):
 474                 /* Check for invalid length PMTU or posted rwqe len. */
 475                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 476                         goto drop;
 477                 qp->r_rcv_len += pmtu;
 478                 if (unlikely(qp->r_rcv_len > qp->r_len))
 479                         goto drop;
 480                 rvt_copy_sge(qp, &qp->r_sge, data, pmtu, true, false);
 481                 break;
 482
 483         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 484                 wc.ex.imm_data = ohdr->u.imm_data;
 485 rdma_last_imm:
 486                 wc.wc_flags = IB_WC_WITH_IMM;
 487
 488                 /* Check for invalid length. */
 489                 /* LAST len should be >= 1 */
 490                 if (unlikely(tlen < (hdrsize + pad + 4)))
 491                         goto drop;
 492                 /* Don't count the CRC. */
 493                 tlen -= (hdrsize + extra_bytes);
 494                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 495                         goto drop;
 496                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 497                         rvt_put_ss(&qp->s_rdma_read_sge);
 498                 } else {
 499                         ret = rvt_get_rwqe(qp, true);
 500                         if (ret < 0)
 501                                 goto op_err;
 502                         if (!ret)
 503                                 goto drop;
 504                 }
 505                 wc.byte_len = qp->r_len;
 506                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 507                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
 508                 rvt_put_ss(&qp->r_sge);
 509                 goto last_imm;
 510
 511         case OP(RDMA_WRITE_LAST):
 512 rdma_last:
 513                 /* Check for invalid length. */
 514                 /* LAST len should be >= 1 */
 515                 if (unlikely(tlen < (hdrsize + pad + 4)))
 516                         goto drop;
 517                 /* Don't count the CRC. */
 518                 tlen -= (hdrsize + extra_bytes);
 519                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 520                         goto drop;
 521                 rvt_copy_sge(qp, &qp->r_sge, data, tlen, true, false);
 522                 rvt_put_ss(&qp->r_sge);
 523                 break;
 524
 525         default:
 526                 /* Drop packet for unknown opcodes. */
 527                 goto drop;
 528         }
 529         qp->r_psn++;
 530         qp->r_state = opcode;
 531         return;
 532
 533 rewind:
 534         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 535         qp->r_sge.num_sge = 0;
 536 drop:
 537         ibp->rvp.n_pkt_drops++;
 538         return;
 539
 540 op_err:
 541         rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 542 }