drivers/infiniband/hw/hfi1/ud.c

   1 /*
   2  * Copyright(c) 2015, 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include <linux/net.h>
  49 #include <rdma/ib_smi.h>
  50
  51 #include "hfi.h"
  52 #include "mad.h"
  53 #include "verbs_txreq.h"
  54 #include "qp.h"
  55
  56 /* We support only two types - 9B and 16B for now */
  57 static const hfi1_make_req hfi1_make_ud_req_tbl[2] = {
  58         [HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B,
  59         [HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B
  60 };
  61
  62 /**
  63  * ud_loopback - handle send on loopback QPs
  64  * @sqp: the sending QP
  65  * @swqe: the send work request
  66  *
  67  * This is called from hfi1_make_ud_req() to forward a WQE addressed
  68  * to the same HFI.
  69  * Note that the receive interrupt handler may be calling hfi1_ud_rcv()
  70  * while this is being called.
  71  */
  72 static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
  73 {
  74         struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
  75         struct hfi1_pportdata *ppd;
  76         struct hfi1_qp_priv *priv = sqp->priv;
  77         struct rvt_qp *qp;
  78         struct rdma_ah_attr *ah_attr;
  79         unsigned long flags;
  80         struct rvt_sge_state ssge;
  81         struct rvt_sge *sge;
  82         struct ib_wc wc;
  83         u32 length;
  84         enum ib_qp_type sqptype, dqptype;
  85
  86         rcu_read_lock();
  87
  88         qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
  89                             swqe->ud_wr.remote_qpn);
  90         if (!qp) {
  91                 ibp->rvp.n_pkt_drops++;
  92                 rcu_read_unlock();
  93                 return;
  94         }
  95
  96         sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
  97                         IB_QPT_UD : sqp->ibqp.qp_type;
  98         dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
  99                         IB_QPT_UD : qp->ibqp.qp_type;
 100
 101         if (dqptype != sqptype ||
 102             !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
 103                 ibp->rvp.n_pkt_drops++;
 104                 goto drop;
 105         }
 106
 107         ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr;
 108         ppd = ppd_from_ibp(ibp);
 109
 110         if (qp->ibqp.qp_num > 1) {
 111                 u16 pkey;
 112                 u32 slid;
 113                 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
 114
 115                 pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
 116                 slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
 117                                    ((1 << ppd->lmc) - 1));
 118                 if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
 119                                                 qp->s_pkey_index,
 120                                                 slid, false))) {
 121                         hfi1_bad_pkey(ibp, pkey,
 122                                       rdma_ah_get_sl(ah_attr),
 123                                       sqp->ibqp.qp_num, qp->ibqp.qp_num,
 124                                       slid, rdma_ah_get_dlid(ah_attr));
 125                         goto drop;
 126                 }
 127         }
 128
 129         /*
 130          * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
 131          * Qkeys with the high order bit set mean use the
 132          * qkey from the QP context instead of the WR (see 10.2.5).
 133          */
 134         if (qp->ibqp.qp_num) {
 135                 u32 qkey;
 136
 137                 qkey = (int)swqe->ud_wr.remote_qkey < 0 ?
 138                         sqp->qkey : swqe->ud_wr.remote_qkey;
 139                 if (unlikely(qkey != qp->qkey))
 140                         goto drop; /* silently drop per IBTA spec */
 141         }
 142
 143         /*
 144          * A GRH is expected to precede the data even if not
 145          * present on the wire.
 146          */
 147         length = swqe->length;
 148         memset(&wc, 0, sizeof(wc));
 149         wc.byte_len = length + sizeof(struct ib_grh);
 150
 151         if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
 152                 wc.wc_flags = IB_WC_WITH_IMM;
 153                 wc.ex.imm_data = swqe->wr.ex.imm_data;
 154         }
 155
 156         spin_lock_irqsave(&qp->r_lock, flags);
 157
 158         /*
 159          * Get the next work request entry to find where to put the data.
 160          */
 161         if (qp->r_flags & RVT_R_REUSE_SGE) {
 162                 qp->r_flags &= ~RVT_R_REUSE_SGE;
 163         } else {
 164                 int ret;
 165
 166                 ret = hfi1_rvt_get_rwqe(qp, 0);
 167                 if (ret < 0) {
 168                         rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 169                         goto bail_unlock;
 170                 }
 171                 if (!ret) {
 172                         if (qp->ibqp.qp_num == 0)
 173                                 ibp->rvp.n_vl15_dropped++;
 174                         goto bail_unlock;
 175                 }
 176         }
 177         /* Silently drop packets which are too big. */
 178         if (unlikely(wc.byte_len > qp->r_len)) {
 179                 qp->r_flags |= RVT_R_REUSE_SGE;
 180                 ibp->rvp.n_pkt_drops++;
 181                 goto bail_unlock;
 182         }
 183
 184         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 185                 struct ib_grh grh;
 186                 struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr));
 187
 188                 /*
 189                  * For loopback packets with extended LIDs, the
 190                  * sgid_index in the GRH is 0 and the dgid is
 191                  * OPA GID of the sender. While creating a response
 192                  * to the loopback packet, IB core creates the new
 193                  * sgid_index from the DGID and that will be the
 194                  * OPA_GID_INDEX. The new dgid is from the sgid
 195                  * index and that will be in the IB GID format.
 196                  *
 197                  * We now have a case where the sent packet had a
 198                  * different sgid_index and dgid compared to the
 199                  * one that was received in response.
 200                  *
 201                  * Fix this inconsistency.
 202                  */
 203                 if (priv->hdr_type == HFI1_PKT_TYPE_16B) {
 204                         if (grd.sgid_index == 0)
 205                                 grd.sgid_index = OPA_GID_INDEX;
 206
 207                         if (ib_is_opa_gid(&grd.dgid))
 208                                 grd.dgid.global.interface_id =
 209                                 cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]);
 210                 }
 211
 212                 hfi1_make_grh(ibp, &grh, &grd, 0, 0);
 213                 hfi1_copy_sge(&qp->r_sge, &grh,
 214                               sizeof(grh), true, false);
 215                 wc.wc_flags |= IB_WC_GRH;
 216         } else {
 217                 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
 218         }
 219         ssge.sg_list = swqe->sg_list + 1;
 220         ssge.sge = *swqe->sg_list;
 221         ssge.num_sge = swqe->wr.num_sge;
 222         sge = &ssge.sge;
 223         while (length) {
 224                 u32 len = sge->length;
 225
 226                 if (len > length)
 227                         len = length;
 228                 if (len > sge->sge_length)
 229                         len = sge->sge_length;
 230                 WARN_ON_ONCE(len == 0);
 231                 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, true, false);
 232                 sge->vaddr += len;
 233                 sge->length -= len;
 234                 sge->sge_length -= len;
 235                 if (sge->sge_length == 0) {
 236                         if (--ssge.num_sge)
 237                                 *sge = *ssge.sg_list++;
 238                 } else if (sge->length == 0 && sge->mr->lkey) {
 239                         if (++sge->n >= RVT_SEGSZ) {
 240                                 if (++sge->m >= sge->mr->mapsz)
 241                                         break;
 242                                 sge->n = 0;
 243                         }
 244                         sge->vaddr =
 245                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 246                         sge->length =
 247                                 sge->mr->map[sge->m]->segs[sge->n].length;
 248                 }
 249                 length -= len;
 250         }
 251         rvt_put_ss(&qp->r_sge);
 252         if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
 253                 goto bail_unlock;
 254         wc.wr_id = qp->r_wr_id;
 255         wc.status = IB_WC_SUCCESS;
 256         wc.opcode = IB_WC_RECV;
 257         wc.qp = &qp->ibqp;
 258         wc.src_qp = sqp->ibqp.qp_num;
 259         if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) {
 260                 if (sqp->ibqp.qp_type == IB_QPT_GSI ||
 261                     sqp->ibqp.qp_type == IB_QPT_SMI)
 262                         wc.pkey_index = swqe->ud_wr.pkey_index;
 263                 else
 264                         wc.pkey_index = sqp->s_pkey_index;
 265         } else {
 266                 wc.pkey_index = 0;
 267         }
 268         wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
 269                                    ((1 << ppd->lmc) - 1))) & U16_MAX;
 270         /* Check for loopback when the port lid is not set */
 271         if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
 272                 wc.slid = be16_to_cpu(IB_LID_PERMISSIVE);
 273         wc.sl = rdma_ah_get_sl(ah_attr);
 274         wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
 275         wc.port_num = qp->port_num;
 276         /* Signal completion event if the solicited bit is set. */
 277         rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
 278                      swqe->wr.send_flags & IB_SEND_SOLICITED);
 279         ibp->rvp.n_loop_pkts++;
 280 bail_unlock:
 281         spin_unlock_irqrestore(&qp->r_lock, flags);
 282 drop:
 283         rcu_read_unlock();
 284 }
 285
 286 static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe,
 287                                struct ib_other_headers *ohdr,
 288                                u16 *pkey, u32 extra_bytes, bool bypass)
 289 {
 290         u32 bth0;
 291         struct hfi1_ibport *ibp;
 292
 293         ibp = to_iport(qp->ibqp.device, qp->port_num);
 294         if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
 295                 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
 296                 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
 297         } else {
 298                 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
 299         }
 300
 301         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 302                 bth0 |= IB_BTH_SOLICITED;
 303         bth0 |= extra_bytes << 20;
 304         if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI)
 305                 *pkey = hfi1_get_pkey(ibp, wqe->ud_wr.pkey_index);
 306         else
 307                 *pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
 308         if (!bypass)
 309                 bth0 |= *pkey;
 310         ohdr->bth[0] = cpu_to_be32(bth0);
 311         ohdr->bth[1] = cpu_to_be32(wqe->ud_wr.remote_qpn);
 312         ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
 313         /*
 314          * Qkeys with the high order bit set mean use the
 315          * qkey from the QP context instead of the WR (see 10.2.5).
 316          */
 317         ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ?
 318                                          qp->qkey : wqe->ud_wr.remote_qkey);
 319         ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
 320 }
 321
 322 void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
 323                          struct rvt_swqe *wqe)
 324 {
 325         u32 nwords, extra_bytes;
 326         u16 len, slid, dlid, pkey;
 327         u16 lrh0 = 0;
 328         u8 sc5;
 329         struct hfi1_qp_priv *priv = qp->priv;
 330         struct ib_other_headers *ohdr;
 331         struct rdma_ah_attr *ah_attr;
 332         struct hfi1_pportdata *ppd;
 333         struct hfi1_ibport *ibp;
 334         struct ib_grh *grh;
 335
 336         ibp = to_iport(qp->ibqp.device, qp->port_num);
 337         ppd = ppd_from_ibp(ibp);
 338         ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
 339
 340         extra_bytes = -wqe->length & 3;
 341         nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC;
 342         /* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
 343         ps->s_txreq->hdr_dwords = 7;
 344         if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
 345                 ps->s_txreq->hdr_dwords++;
 346
 347         if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 348                 grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
 349                 ps->s_txreq->hdr_dwords +=
 350                         hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr),
 351                                       ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
 352                                       nwords);
 353                 lrh0 = HFI1_LRH_GRH;
 354                 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
 355         } else {
 356                 lrh0 = HFI1_LRH_BTH;
 357                 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
 358         }
 359
 360         sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
 361         lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
 362         if (qp->ibqp.qp_type == IB_QPT_SMI) {
 363                 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
 364                 priv->s_sc = 0xf;
 365         } else {
 366                 lrh0 |= (sc5 & 0xf) << 12;
 367                 priv->s_sc = sc5;
 368         }
 369
 370         dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
 371         if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
 372                 slid = be16_to_cpu(IB_LID_PERMISSIVE);
 373         } else {
 374                 u16 lid = (u16)ppd->lid;
 375
 376                 if (lid) {
 377                         lid |= rdma_ah_get_path_bits(ah_attr) &
 378                                 ((1 << ppd->lmc) - 1);
 379                         slid = lid;
 380                 } else {
 381                         slid = be16_to_cpu(IB_LID_PERMISSIVE);
 382                 }
 383         }
 384         hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false);
 385         len = ps->s_txreq->hdr_dwords + nwords;
 386
 387         /* Setup the packet */
 388         ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B;
 389         hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
 390                          lrh0, len, dlid, slid);
 391 }
 392
 393 void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
 394                           struct rvt_swqe *wqe)
 395 {
 396         struct hfi1_qp_priv *priv = qp->priv;
 397         struct ib_other_headers *ohdr;
 398         struct rdma_ah_attr *ah_attr;
 399         struct hfi1_pportdata *ppd;
 400         struct hfi1_ibport *ibp;
 401         u32 dlid, slid, nwords, extra_bytes;
 402         u16 len, pkey;
 403         u8 l4, sc5;
 404
 405         ibp = to_iport(qp->ibqp.device, qp->port_num);
 406         ppd = ppd_from_ibp(ibp);
 407         ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
 408         /* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */
 409         ps->s_txreq->hdr_dwords = 9;
 410         if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
 411                 ps->s_txreq->hdr_dwords++;
 412
 413         /* SW provides space for CRC and LT for bypass packets. */
 414         extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2),
 415                                            wqe->length);
 416         nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
 417
 418         if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
 419             hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) {
 420                 struct ib_grh *grh;
 421                 struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr);
 422                 /*
 423                  * Ensure OPA GIDs are transformed to IB gids
 424                  * before creating the GRH.
 425                  */
 426                 if (grd->sgid_index == OPA_GID_INDEX) {
 427                         dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n",
 428                                     grd->sgid_index);
 429                         grd->sgid_index = 0;
 430                 }
 431                 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
 432                 ps->s_txreq->hdr_dwords += hfi1_make_grh(
 433                         ibp, grh, grd,
 434                         ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
 435                         nwords);
 436                 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
 437                 l4 = OPA_16B_L4_IB_GLOBAL;
 438         } else {
 439                 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
 440                 l4 = OPA_16B_L4_IB_LOCAL;
 441         }
 442
 443         sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
 444         if (qp->ibqp.qp_type == IB_QPT_SMI)
 445                 priv->s_sc = 0xf;
 446         else
 447                 priv->s_sc = sc5;
 448
 449         dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B);
 450         if (!ppd->lid)
 451                 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
 452         else
 453                 slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
 454                            ((1 << ppd->lmc) - 1));
 455
 456         hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true);
 457         /* Convert dwords to flits */
 458         len = (ps->s_txreq->hdr_dwords + nwords) >> 1;
 459
 460         /* Setup the packet */
 461         ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B;
 462         hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
 463                           slid, dlid, len, pkey, 0, 0, l4, priv->s_sc);
 464 }
 465
 466 /**
 467  * hfi1_make_ud_req - construct a UD request packet
 468  * @qp: the QP
 469  *
 470  * Assume s_lock is held.
 471  *
 472  * Return 1 if constructed; otherwise, return 0.
 473  */
 474 int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 475 {
 476         struct hfi1_qp_priv *priv = qp->priv;
 477         struct rdma_ah_attr *ah_attr;
 478         struct hfi1_pportdata *ppd;
 479         struct hfi1_ibport *ibp;
 480         struct rvt_swqe *wqe;
 481         int next_cur;
 482         u32 lid;
 483
 484         ps->s_txreq = get_txreq(ps->dev, qp);
 485         if (IS_ERR(ps->s_txreq))
 486                 goto bail_no_tx;
 487
 488         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
 489                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
 490                         goto bail;
 491                 /* We are in the error state, flush the work request. */
 492                 if (qp->s_last == READ_ONCE(qp->s_head))
 493                         goto bail;
 494                 /* If DMAs are in progress, we can't flush immediately. */
 495                 if (iowait_sdma_pending(&priv->s_iowait)) {
 496                         qp->s_flags |= RVT_S_WAIT_DMA;
 497                         goto bail;
 498                 }
 499                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 500                 hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
 501                 goto done_free_tx;
 502         }
 503
 504         /* see post_one_send() */
 505         if (qp->s_cur == READ_ONCE(qp->s_head))
 506                 goto bail;
 507
 508         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
 509         next_cur = qp->s_cur + 1;
 510         if (next_cur >= qp->s_size)
 511                 next_cur = 0;
 512
 513         /* Construct the header. */
 514         ibp = to_iport(qp->ibqp.device, qp->port_num);
 515         ppd = ppd_from_ibp(ibp);
 516         ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
 517         priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr);
 518         if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) ||
 519             (rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) {
 520                 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
 521                 if (unlikely(!loopback &&
 522                              ((lid == ppd->lid) ||
 523                               ((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) &&
 524                                (qp->ibqp.qp_type == IB_QPT_GSI))))) {
 525                         unsigned long tflags = ps->flags;
 526                         /*
 527                          * If DMAs are in progress, we can't generate
 528                          * a completion for the loopback packet since
 529                          * it would be out of order.
 530                          * Instead of waiting, we could queue a
 531                          * zero length descriptor so we get a callback.
 532                          */
 533                         if (iowait_sdma_pending(&priv->s_iowait)) {
 534                                 qp->s_flags |= RVT_S_WAIT_DMA;
 535                                 goto bail;
 536                         }
 537                         qp->s_cur = next_cur;
 538                         spin_unlock_irqrestore(&qp->s_lock, tflags);
 539                         ud_loopback(qp, wqe);
 540                         spin_lock_irqsave(&qp->s_lock, tflags);
 541                         ps->flags = tflags;
 542                         hfi1_send_complete(qp, wqe, IB_WC_SUCCESS);
 543                         goto done_free_tx;
 544                 }
 545         }
 546
 547         qp->s_cur = next_cur;
 548         ps->s_txreq->s_cur_size = wqe->length;
 549         ps->s_txreq->ss = &qp->s_sge;
 550         qp->s_srate = rdma_ah_get_static_rate(ah_attr);
 551         qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
 552         qp->s_wqe = wqe;
 553         qp->s_sge.sge = wqe->sg_list[0];
 554         qp->s_sge.sg_list = wqe->sg_list + 1;
 555         qp->s_sge.num_sge = wqe->wr.num_sge;
 556         qp->s_sge.total_len = wqe->length;
 557
 558         /* Make the appropriate header */
 559         hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe);
 560         priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 561         ps->s_txreq->sde = priv->s_sde;
 562         priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 563         ps->s_txreq->psc = priv->s_sendcontext;
 564         /* disarm any ahg */
 565         priv->s_ahg->ahgcount = 0;
 566         priv->s_ahg->ahgidx = 0;
 567         priv->s_ahg->tx_flags = 0;
 568
 569         return 1;
 570
 571 done_free_tx:
 572         hfi1_put_txreq(ps->s_txreq);
 573         ps->s_txreq = NULL;
 574         return 1;
 575
 576 bail:
 577         hfi1_put_txreq(ps->s_txreq);
 578
 579 bail_no_tx:
 580         ps->s_txreq = NULL;
 581         qp->s_flags &= ~RVT_S_BUSY;
 582         return 0;
 583 }
 584
 585 /*
 586  * Hardware can't check this so we do it here.
 587  *
 588  * This is a slightly different algorithm than the standard pkey check.  It
 589  * special cases the management keys and allows for 0x7fff and 0xffff to be in
 590  * the table at the same time.
 591  *
 592  * @returns the index found or -1 if not found
 593  */
 594 int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey)
 595 {
 596         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 597         unsigned i;
 598
 599         if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) {
 600                 unsigned lim_idx = -1;
 601
 602                 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) {
 603                         /* here we look for an exact match */
 604                         if (ppd->pkeys[i] == pkey)
 605                                 return i;
 606                         if (ppd->pkeys[i] == LIM_MGMT_P_KEY)
 607                                 lim_idx = i;
 608                 }
 609
 610                 /* did not find 0xffff return 0x7fff idx if found */
 611                 if (pkey == FULL_MGMT_P_KEY)
 612                         return lim_idx;
 613
 614                 /* no match...  */
 615                 return -1;
 616         }
 617
 618         pkey &= 0x7fff; /* remove limited/full membership bit */
 619
 620         for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i)
 621                 if ((ppd->pkeys[i] & 0x7fff) == pkey)
 622                         return i;
 623
 624         /*
 625          * Should not get here, this means hardware failed to validate pkeys.
 626          */
 627         return -1;
 628 }
 629
 630 void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp,
 631                     u32 remote_qpn, u32 pkey, u32 slid, u32 dlid,
 632                     u8 sc5, const struct ib_grh *old_grh)
 633 {
 634         u64 pbc, pbc_flags = 0;
 635         u32 bth0, plen, vl, hwords = 7;
 636         u16 len;
 637         u8 l4;
 638         struct hfi1_16b_header hdr;
 639         struct ib_other_headers *ohdr;
 640         struct pio_buf *pbuf;
 641         struct send_context *ctxt = qp_to_send_context(qp, sc5);
 642         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 643         u32 nwords;
 644
 645         /* Populate length */
 646         nwords = ((hfi1_get_16b_padding(hwords << 2, 0) +
 647                    SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
 648         if (old_grh) {
 649                 struct ib_grh *grh = &hdr.u.l.grh;
 650
 651                 grh->version_tclass_flow = old_grh->version_tclass_flow;
 652                 grh->paylen = cpu_to_be16(
 653                         (hwords - LRH_16B_DWORDS + nwords) << 2);
 654                 grh->hop_limit = 0xff;
 655                 grh->sgid = old_grh->dgid;
 656                 grh->dgid = old_grh->sgid;
 657                 ohdr = &hdr.u.l.oth;
 658                 l4 = OPA_16B_L4_IB_GLOBAL;
 659                 hwords += sizeof(struct ib_grh) / sizeof(u32);
 660         } else {
 661                 ohdr = &hdr.u.oth;
 662                 l4 = OPA_16B_L4_IB_LOCAL;
 663         }
 664
 665         /* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */
 666         bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) |
 667                (hfi1_get_16b_padding(hwords << 2, 0) << 20);
 668         ohdr->bth[0] = cpu_to_be32(bth0);
 669
 670         ohdr->bth[1] = cpu_to_be32(remote_qpn);
 671         ohdr->bth[2] = 0; /* PSN 0 */
 672
 673         /* Convert dwords to flits */
 674         len = (hwords + nwords) >> 1;
 675         hfi1_make_16b_hdr(&hdr, slid, dlid, len, pkey, 1, 0, l4, sc5);
 676
 677         plen = 2 /* PBC */ + hwords + nwords;
 678         pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
 679         vl = sc_to_vlt(ppd->dd, sc5);
 680         pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
 681         if (ctxt) {
 682                 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
 683                 if (pbuf)
 684                         ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
 685                                                  &hdr, hwords);
 686         }
 687 }
 688
 689 void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn,
 690                 u32 pkey, u32 slid, u32 dlid, u8 sc5,
 691                 const struct ib_grh *old_grh)
 692 {
 693         u64 pbc, pbc_flags = 0;
 694         u32 bth0, plen, vl, hwords = 5;
 695         u16 lrh0;
 696         u8 sl = ibp->sc_to_sl[sc5];
 697         struct ib_header hdr;
 698         struct ib_other_headers *ohdr;
 699         struct pio_buf *pbuf;
 700         struct send_context *ctxt = qp_to_send_context(qp, sc5);
 701         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 702
 703         if (old_grh) {
 704                 struct ib_grh *grh = &hdr.u.l.grh;
 705
 706                 grh->version_tclass_flow = old_grh->version_tclass_flow;
 707                 grh->paylen = cpu_to_be16(
 708                         (hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2);
 709                 grh->hop_limit = 0xff;
 710                 grh->sgid = old_grh->dgid;
 711                 grh->dgid = old_grh->sgid;
 712                 ohdr = &hdr.u.l.oth;
 713                 lrh0 = HFI1_LRH_GRH;
 714                 hwords += sizeof(struct ib_grh) / sizeof(u32);
 715         } else {
 716                 ohdr = &hdr.u.oth;
 717                 lrh0 = HFI1_LRH_BTH;
 718         }
 719
 720         lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
 721
 722         bth0 = pkey | (IB_OPCODE_CNP << 24);
 723         ohdr->bth[0] = cpu_to_be32(bth0);
 724
 725         ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT));
 726         ohdr->bth[2] = 0; /* PSN 0 */
 727
 728         hfi1_make_ib_hdr(&hdr, lrh0, hwords + SIZE_OF_CRC, dlid, slid);
 729         plen = 2 /* PBC */ + hwords;
 730         pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
 731         vl = sc_to_vlt(ppd->dd, sc5);
 732         pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
 733         if (ctxt) {
 734                 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
 735                 if (pbuf)
 736                         ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
 737                                                  &hdr, hwords);
 738         }
 739 }
 740
 741 /*
 742  * opa_smp_check() - Do the regular pkey checking, and the additional
 743  * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section
 744  * 9.10.25 ("SMA Packet Checks").
 745  *
 746  * Note that:
 747  *   - Checks are done using the pkey directly from the packet's BTH,
 748  *     and specifically _not_ the pkey that we attach to the completion,
 749  *     which may be different.
 750  *   - These checks are specifically for "non-local" SMPs (i.e., SMPs
 751  *     which originated on another node). SMPs which are sent from, and
 752  *     destined to this node are checked in opa_local_smp_check().
 753  *
 754  * At the point where opa_smp_check() is called, we know:
 755  *   - destination QP is QP0
 756  *
 757  * opa_smp_check() returns 0 if all checks succeed, 1 otherwise.
 758  */
 759 static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5,
 760                          struct rvt_qp *qp, u16 slid, struct opa_smp *smp)
 761 {
 762         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 763
 764         /*
 765          * I don't think it's possible for us to get here with sc != 0xf,
 766          * but check it to be certain.
 767          */
 768         if (sc5 != 0xf)
 769                 return 1;
 770
 771         if (rcv_pkey_check(ppd, pkey, sc5, slid))
 772                 return 1;
 773
 774         /*
 775          * At this point we know (and so don't need to check again) that
 776          * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY
 777          * (see ingress_pkey_check).
 778          */
 779         if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE &&
 780             smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) {
 781                 ingress_pkey_table_fail(ppd, pkey, slid);
 782                 return 1;
 783         }
 784
 785         /*
 786          * SMPs fall into one of four (disjoint) categories:
 787          * SMA request, SMA response, SMA trap, or SMA trap repress.
 788          * Our response depends, in part, on which type of SMP we're
 789          * processing.
 790          *
 791          * If this is an SMA response, skip the check here.
 792          *
 793          * If this is an SMA request or SMA trap repress:
 794          *   - pkey != FULL_MGMT_P_KEY =>
 795          *       increment port recv constraint errors, drop MAD
 796          *
 797          * Otherwise:
 798          *    - accept if the port is running an SM
 799          *    - drop MAD if it's an SMA trap
 800          *    - pkey == FULL_MGMT_P_KEY =>
 801          *        reply with unsupported method
 802          *    - pkey != FULL_MGMT_P_KEY =>
 803          *        increment port recv constraint errors, drop MAD
 804          */
 805         switch (smp->method) {
 806         case IB_MGMT_METHOD_GET_RESP:
 807         case IB_MGMT_METHOD_REPORT_RESP:
 808                 break;
 809         case IB_MGMT_METHOD_GET:
 810         case IB_MGMT_METHOD_SET:
 811         case IB_MGMT_METHOD_REPORT:
 812         case IB_MGMT_METHOD_TRAP_REPRESS:
 813                 if (pkey != FULL_MGMT_P_KEY) {
 814                         ingress_pkey_table_fail(ppd, pkey, slid);
 815                         return 1;
 816                 }
 817                 break;
 818         default:
 819                 if (ibp->rvp.port_cap_flags & IB_PORT_SM)
 820                         return 0;
 821                 if (smp->method == IB_MGMT_METHOD_TRAP)
 822                         return 1;
 823                 if (pkey == FULL_MGMT_P_KEY) {
 824                         smp->status |= IB_SMP_UNSUP_METHOD;
 825                         return 0;
 826                 }
 827                 ingress_pkey_table_fail(ppd, pkey, slid);
 828                 return 1;
 829         }
 830         return 0;
 831 }
 832
 833 /**
 834  * hfi1_ud_rcv - receive an incoming UD packet
 835  * @ibp: the port the packet came in on
 836  * @hdr: the packet header
 837  * @rcv_flags: flags relevant to rcv processing
 838  * @data: the packet data
 839  * @tlen: the packet length
 840  * @qp: the QP the packet came on
 841  *
 842  * This is called from qp_rcv() to process an incoming UD packet
 843  * for the given QP.
 844  * Called at interrupt level.
 845  */
 846 void hfi1_ud_rcv(struct hfi1_packet *packet)
 847 {
 848         struct ib_other_headers *ohdr = packet->ohdr;
 849         u32 hdrsize = packet->hlen;
 850         struct ib_wc wc;
 851         u32 qkey;
 852         u32 src_qp;
 853         u16 pkey;
 854         int mgmt_pkey_idx = -1;
 855         struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
 856         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 857         void *data = packet->payload;
 858         u32 tlen = packet->tlen;
 859         struct rvt_qp *qp = packet->qp;
 860         u8 sc5 = packet->sc;
 861         u8 sl_from_sc;
 862         u8 opcode = packet->opcode;
 863         u8 sl = packet->sl;
 864         u32 dlid = packet->dlid;
 865         u32 slid = packet->slid;
 866         u8 extra_bytes;
 867         bool dlid_is_permissive;
 868         bool slid_is_permissive;
 869
 870         extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2);
 871         qkey = ib_get_qkey(ohdr);
 872         src_qp = ib_get_sqpn(ohdr);
 873
 874         if (packet->etype == RHF_RCV_TYPE_BYPASS) {
 875                 u32 permissive_lid =
 876                         opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B);
 877
 878                 pkey = hfi1_16B_get_pkey(packet->hdr);
 879                 dlid_is_permissive = (dlid == permissive_lid);
 880                 slid_is_permissive = (slid == permissive_lid);
 881         } else {
 882                 pkey = ib_bth_get_pkey(ohdr);
 883                 dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE));
 884                 slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE));
 885         }
 886         sl_from_sc = ibp->sc_to_sl[sc5];
 887
 888         process_ecn(qp, packet, (opcode != IB_OPCODE_CNP));
 889         /*
 890          * Get the number of bytes the message was padded by
 891          * and drop incomplete packets.
 892          */
 893         if (unlikely(tlen < (hdrsize + extra_bytes)))
 894                 goto drop;
 895
 896         tlen -= hdrsize + extra_bytes;
 897
 898         /*
 899          * Check that the permissive LID is only used on QP0
 900          * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
 901          */
 902         if (qp->ibqp.qp_num) {
 903                 if (unlikely(dlid_is_permissive || slid_is_permissive))
 904                         goto drop;
 905                 if (qp->ibqp.qp_num > 1) {
 906                         if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) {
 907                                 /*
 908                                  * Traps will not be sent for packets dropped
 909                                  * by the HW. This is fine, as sending trap
 910                                  * for invalid pkeys is optional according to
 911                                  * IB spec (release 1.3, section 10.9.4)
 912                                  */
 913                                 hfi1_bad_pkey(ibp,
 914                                               pkey, sl,
 915                                               src_qp, qp->ibqp.qp_num,
 916                                               slid, dlid);
 917                                 return;
 918                         }
 919                 } else {
 920                         /* GSI packet */
 921                         mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
 922                         if (mgmt_pkey_idx < 0)
 923                                 goto drop;
 924                 }
 925                 if (unlikely(qkey != qp->qkey)) /* Silent drop */
 926                         return;
 927
 928                 /* Drop invalid MAD packets (see 13.5.3.1). */
 929                 if (unlikely(qp->ibqp.qp_num == 1 &&
 930                              (tlen > 2048 || (sc5 == 0xF))))
 931                         goto drop;
 932         } else {
 933                 /* Received on QP0, and so by definition, this is an SMP */
 934                 struct opa_smp *smp = (struct opa_smp *)data;
 935
 936                 if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
 937                         goto drop;
 938
 939                 if (tlen > 2048)
 940                         goto drop;
 941                 if ((dlid_is_permissive || slid_is_permissive) &&
 942                     smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 943                         goto drop;
 944
 945                 /* look up SMI pkey */
 946                 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
 947                 if (mgmt_pkey_idx < 0)
 948                         goto drop;
 949         }
 950
 951         if (qp->ibqp.qp_num > 1 &&
 952             opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
 953                 wc.ex.imm_data = ohdr->u.ud.imm_data;
 954                 wc.wc_flags = IB_WC_WITH_IMM;
 955                 tlen -= sizeof(u32);
 956         } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
 957                 wc.ex.imm_data = 0;
 958                 wc.wc_flags = 0;
 959         } else {
 960                 goto drop;
 961         }
 962
 963         /*
 964          * A GRH is expected to precede the data even if not
 965          * present on the wire.
 966          */
 967         wc.byte_len = tlen + sizeof(struct ib_grh);
 968
 969         /*
 970          * Get the next work request entry to find where to put the data.
 971          */
 972         if (qp->r_flags & RVT_R_REUSE_SGE) {
 973                 qp->r_flags &= ~RVT_R_REUSE_SGE;
 974         } else {
 975                 int ret;
 976
 977                 ret = hfi1_rvt_get_rwqe(qp, 0);
 978                 if (ret < 0) {
 979                         rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 980                         return;
 981                 }
 982                 if (!ret) {
 983                         if (qp->ibqp.qp_num == 0)
 984                                 ibp->rvp.n_vl15_dropped++;
 985                         return;
 986                 }
 987         }
 988         /* Silently drop packets which are too big. */
 989         if (unlikely(wc.byte_len > qp->r_len)) {
 990                 qp->r_flags |= RVT_R_REUSE_SGE;
 991                 goto drop;
 992         }
 993         if (packet->grh) {
 994                 hfi1_copy_sge(&qp->r_sge, packet->grh,
 995                               sizeof(struct ib_grh), true, false);
 996                 wc.wc_flags |= IB_WC_GRH;
 997         } else if (packet->etype == RHF_RCV_TYPE_BYPASS) {
 998                 struct ib_grh grh;
 999                 /*
1000                  * Assuming we only created 16B on the send side
1001                  * if we want to use large LIDs, since GRH was stripped
1002                  * out when creating 16B, add back the GRH here.
1003                  */
1004                 hfi1_make_ext_grh(packet, &grh, slid, dlid);
1005                 hfi1_copy_sge(&qp->r_sge, &grh,
1006                               sizeof(struct ib_grh), true, false);
1007                 wc.wc_flags |= IB_WC_GRH;
1008         } else {
1009                 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
1010         }
1011         hfi1_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
1012                       true, false);
1013         rvt_put_ss(&qp->r_sge);
1014         if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
1015                 return;
1016         wc.wr_id = qp->r_wr_id;
1017         wc.status = IB_WC_SUCCESS;
1018         wc.opcode = IB_WC_RECV;
1019         wc.vendor_err = 0;
1020         wc.qp = &qp->ibqp;
1021         wc.src_qp = src_qp;
1022
1023         if (qp->ibqp.qp_type == IB_QPT_GSI ||
1024             qp->ibqp.qp_type == IB_QPT_SMI) {
1025                 if (mgmt_pkey_idx < 0) {
1026                         if (net_ratelimit()) {
1027                                 struct hfi1_devdata *dd = ppd->dd;
1028
1029                                 dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n",
1030                                            qp->ibqp.qp_type);
1031                                 mgmt_pkey_idx = 0;
1032                         }
1033                 }
1034                 wc.pkey_index = (unsigned)mgmt_pkey_idx;
1035         } else {
1036                 wc.pkey_index = 0;
1037         }
1038         if (slid_is_permissive)
1039                 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
1040         wc.slid = slid & U16_MAX;
1041         wc.sl = sl_from_sc;
1042
1043         /*
1044          * Save the LMC lower bits if the destination LID is a unicast LID.
1045          */
1046         wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 0 :
1047                 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
1048         wc.port_num = qp->port_num;
1049         /* Signal completion event if the solicited bit is set. */
1050         rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
1051                      ib_bth_is_solicited(ohdr));
1052         return;
1053
1054 drop:
1055         ibp->rvp.n_pkt_drops++;
1056 }