drivers/infiniband/hw/hfi1/ruc.c

   1 /*
   2  * Copyright(c) 2015 - 2017 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/spinlock.h>
  49
  50 #include "hfi.h"
  51 #include "mad.h"
  52 #include "qp.h"
  53 #include "verbs_txreq.h"
  54 #include "trace.h"
  55
  56 /*
  57  * Validate a RWQE and fill in the SGE state.
  58  * Return 1 if OK.
  59  */
  60 static int init_sge(struct rvt_qp *qp, struct rvt_rwqe *wqe)
  61 {
  62         int i, j, ret;
  63         struct ib_wc wc;
  64         struct rvt_lkey_table *rkt;
  65         struct rvt_pd *pd;
  66         struct rvt_sge_state *ss;
  67
  68         rkt = &to_idev(qp->ibqp.device)->rdi.lkey_table;
  69         pd = ibpd_to_rvtpd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd);
  70         ss = &qp->r_sge;
  71         ss->sg_list = qp->r_sg_list;
  72         qp->r_len = 0;
  73         for (i = j = 0; i < wqe->num_sge; i++) {
  74                 if (wqe->sg_list[i].length == 0)
  75                         continue;
  76                 /* Check LKEY */
  77                 ret = rvt_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge,
  78                                   NULL, &wqe->sg_list[i],
  79                                   IB_ACCESS_LOCAL_WRITE);
  80                 if (unlikely(ret <= 0))
  81                         goto bad_lkey;
  82                 qp->r_len += wqe->sg_list[i].length;
  83                 j++;
  84         }
  85         ss->num_sge = j;
  86         ss->total_len = qp->r_len;
  87         ret = 1;
  88         goto bail;
  89
  90 bad_lkey:
  91         while (j) {
  92                 struct rvt_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge;
  93
  94                 rvt_put_mr(sge->mr);
  95         }
  96         ss->num_sge = 0;
  97         memset(&wc, 0, sizeof(wc));
  98         wc.wr_id = wqe->wr_id;
  99         wc.status = IB_WC_LOC_PROT_ERR;
 100         wc.opcode = IB_WC_RECV;
 101         wc.qp = &qp->ibqp;
 102         /* Signal solicited completion event. */
 103         rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 1);
 104         ret = 0;
 105 bail:
 106         return ret;
 107 }
 108
 109 /**
 110  * hfi1_rvt_get_rwqe - copy the next RWQE into the QP's RWQE
 111  * @qp: the QP
 112  * @wr_id_only: update qp->r_wr_id only, not qp->r_sge
 113  *
 114  * Return -1 if there is a local error, 0 if no RWQE is available,
 115  * otherwise return 1.
 116  *
 117  * Can be called from interrupt level.
 118  */
 119 int hfi1_rvt_get_rwqe(struct rvt_qp *qp, int wr_id_only)
 120 {
 121         unsigned long flags;
 122         struct rvt_rq *rq;
 123         struct rvt_rwq *wq;
 124         struct rvt_srq *srq;
 125         struct rvt_rwqe *wqe;
 126         void (*handler)(struct ib_event *, void *);
 127         u32 tail;
 128         int ret;
 129
 130         if (qp->ibqp.srq) {
 131                 srq = ibsrq_to_rvtsrq(qp->ibqp.srq);
 132                 handler = srq->ibsrq.event_handler;
 133                 rq = &srq->rq;
 134         } else {
 135                 srq = NULL;
 136                 handler = NULL;
 137                 rq = &qp->r_rq;
 138         }
 139
 140         spin_lock_irqsave(&rq->lock, flags);
 141         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
 142                 ret = 0;
 143                 goto unlock;
 144         }
 145
 146         wq = rq->wq;
 147         tail = wq->tail;
 148         /* Validate tail before using it since it is user writable. */
 149         if (tail >= rq->size)
 150                 tail = 0;
 151         if (unlikely(tail == wq->head)) {
 152                 ret = 0;
 153                 goto unlock;
 154         }
 155         /* Make sure entry is read after head index is read. */
 156         smp_rmb();
 157         wqe = rvt_get_rwqe_ptr(rq, tail);
 158         /*
 159          * Even though we update the tail index in memory, the verbs
 160          * consumer is not supposed to post more entries until a
 161          * completion is generated.
 162          */
 163         if (++tail >= rq->size)
 164                 tail = 0;
 165         wq->tail = tail;
 166         if (!wr_id_only && !init_sge(qp, wqe)) {
 167                 ret = -1;
 168                 goto unlock;
 169         }
 170         qp->r_wr_id = wqe->wr_id;
 171
 172         ret = 1;
 173         set_bit(RVT_R_WRID_VALID, &qp->r_aflags);
 174         if (handler) {
 175                 u32 n;
 176
 177                 /*
 178                  * Validate head pointer value and compute
 179                  * the number of remaining WQEs.
 180                  */
 181                 n = wq->head;
 182                 if (n >= rq->size)
 183                         n = 0;
 184                 if (n < tail)
 185                         n += rq->size - tail;
 186                 else
 187                         n -= tail;
 188                 if (n < srq->limit) {
 189                         struct ib_event ev;
 190
 191                         srq->limit = 0;
 192                         spin_unlock_irqrestore(&rq->lock, flags);
 193                         ev.device = qp->ibqp.device;
 194                         ev.element.srq = qp->ibqp.srq;
 195                         ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
 196                         handler(&ev, srq->ibsrq.srq_context);
 197                         goto bail;
 198                 }
 199         }
 200 unlock:
 201         spin_unlock_irqrestore(&rq->lock, flags);
 202 bail:
 203         return ret;
 204 }
 205
 206 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
 207 {
 208         return (gid->global.interface_id == id &&
 209                 (gid->global.subnet_prefix == gid_prefix ||
 210                  gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
 211 }
 212
 213 /*
 214  *
 215  * This should be called with the QP r_lock held.
 216  *
 217  * The s_lock will be acquired around the hfi1_migrate_qp() call.
 218  */
 219 int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_packet *packet)
 220 {
 221         __be64 guid;
 222         unsigned long flags;
 223         struct rvt_qp *qp = packet->qp;
 224         u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
 225         u32 dlid = packet->dlid;
 226         u32 slid = packet->slid;
 227         u32 sl = packet->sl;
 228         bool migrated = packet->migrated;
 229         u16 pkey = packet->pkey;
 230
 231         if (qp->s_mig_state == IB_MIG_ARMED && migrated) {
 232                 if (!packet->grh) {
 233                         if ((rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
 234                              IB_AH_GRH) &&
 235                             (packet->etype != RHF_RCV_TYPE_BYPASS))
 236                                 return 1;
 237                 } else {
 238                         const struct ib_global_route *grh;
 239
 240                         if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
 241                               IB_AH_GRH))
 242                                 return 1;
 243                         grh = rdma_ah_read_grh(&qp->alt_ah_attr);
 244                         guid = get_sguid(ibp, grh->sgid_index);
 245                         if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix,
 246                                     guid))
 247                                 return 1;
 248                         if (!gid_ok(
 249                                 &packet->grh->sgid,
 250                                 grh->dgid.global.subnet_prefix,
 251                                 grh->dgid.global.interface_id))
 252                                 return 1;
 253                 }
 254                 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey,
 255                                             sc5, slid))) {
 256                         hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num,
 257                                       slid, dlid);
 258                         return 1;
 259                 }
 260                 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
 261                 if (slid != rdma_ah_get_dlid(&qp->alt_ah_attr) ||
 262                     ppd_from_ibp(ibp)->port !=
 263                         rdma_ah_get_port_num(&qp->alt_ah_attr))
 264                         return 1;
 265                 spin_lock_irqsave(&qp->s_lock, flags);
 266                 hfi1_migrate_qp(qp);
 267                 spin_unlock_irqrestore(&qp->s_lock, flags);
 268         } else {
 269                 if (!packet->grh) {
 270                         if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
 271                              IB_AH_GRH) &&
 272                             (packet->etype != RHF_RCV_TYPE_BYPASS))
 273                                 return 1;
 274                 } else {
 275                         const struct ib_global_route *grh;
 276
 277                         if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
 278                                                    IB_AH_GRH))
 279                                 return 1;
 280                         grh = rdma_ah_read_grh(&qp->remote_ah_attr);
 281                         guid = get_sguid(ibp, grh->sgid_index);
 282                         if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix,
 283                                     guid))
 284                                 return 1;
 285                         if (!gid_ok(
 286                              &packet->grh->sgid,
 287                              grh->dgid.global.subnet_prefix,
 288                              grh->dgid.global.interface_id))
 289                                 return 1;
 290                 }
 291                 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey,
 292                                             sc5, slid))) {
 293                         hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num,
 294                                       slid, dlid);
 295                         return 1;
 296                 }
 297                 /* Validate the SLID. See Ch. 9.6.1.5 */
 298                 if ((slid != rdma_ah_get_dlid(&qp->remote_ah_attr)) ||
 299                     ppd_from_ibp(ibp)->port != qp->port_num)
 300                         return 1;
 301                 if (qp->s_mig_state == IB_MIG_REARM && !migrated)
 302                         qp->s_mig_state = IB_MIG_ARMED;
 303         }
 304
 305         return 0;
 306 }
 307
 308 /**
 309  * ruc_loopback - handle UC and RC loopback requests
 310  * @sqp: the sending QP
 311  *
 312  * This is called from hfi1_do_send() to
 313  * forward a WQE addressed to the same HFI.
 314  * Note that although we are single threaded due to the send engine, we still
 315  * have to protect against post_send().  We don't have to worry about
 316  * receive interrupts since this is a connected protocol and all packets
 317  * will pass through here.
 318  */
 319 static void ruc_loopback(struct rvt_qp *sqp)
 320 {
 321         struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
 322         struct rvt_qp *qp;
 323         struct rvt_swqe *wqe;
 324         struct rvt_sge *sge;
 325         unsigned long flags;
 326         struct ib_wc wc;
 327         u64 sdata;
 328         atomic64_t *maddr;
 329         enum ib_wc_status send_status;
 330         bool release;
 331         int ret;
 332         bool copy_last = false;
 333         int local_ops = 0;
 334
 335         rcu_read_lock();
 336
 337         /*
 338          * Note that we check the responder QP state after
 339          * checking the requester's state.
 340          */
 341         qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
 342                             sqp->remote_qpn);
 343
 344         spin_lock_irqsave(&sqp->s_lock, flags);
 345
 346         /* Return if we are already busy processing a work request. */
 347         if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) ||
 348             !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND))
 349                 goto unlock;
 350
 351         sqp->s_flags |= RVT_S_BUSY;
 352
 353 again:
 354         if (sqp->s_last == READ_ONCE(sqp->s_head))
 355                 goto clr_busy;
 356         wqe = rvt_get_swqe_ptr(sqp, sqp->s_last);
 357
 358         /* Return if it is not OK to start a new work request. */
 359         if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
 360                 if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND))
 361                         goto clr_busy;
 362                 /* We are in the error state, flush the work request. */
 363                 send_status = IB_WC_WR_FLUSH_ERR;
 364                 goto flush_send;
 365         }
 366
 367         /*
 368          * We can rely on the entry not changing without the s_lock
 369          * being held until we update s_last.
 370          * We increment s_cur to indicate s_last is in progress.
 371          */
 372         if (sqp->s_last == sqp->s_cur) {
 373                 if (++sqp->s_cur >= sqp->s_size)
 374                         sqp->s_cur = 0;
 375         }
 376         spin_unlock_irqrestore(&sqp->s_lock, flags);
 377
 378         if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) ||
 379             qp->ibqp.qp_type != sqp->ibqp.qp_type) {
 380                 ibp->rvp.n_pkt_drops++;
 381                 /*
 382                  * For RC, the requester would timeout and retry so
 383                  * shortcut the timeouts and just signal too many retries.
 384                  */
 385                 if (sqp->ibqp.qp_type == IB_QPT_RC)
 386                         send_status = IB_WC_RETRY_EXC_ERR;
 387                 else
 388                         send_status = IB_WC_SUCCESS;
 389                 goto serr;
 390         }
 391
 392         memset(&wc, 0, sizeof(wc));
 393         send_status = IB_WC_SUCCESS;
 394
 395         release = true;
 396         sqp->s_sge.sge = wqe->sg_list[0];
 397         sqp->s_sge.sg_list = wqe->sg_list + 1;
 398         sqp->s_sge.num_sge = wqe->wr.num_sge;
 399         sqp->s_len = wqe->length;
 400         switch (wqe->wr.opcode) {
 401         case IB_WR_REG_MR:
 402                 goto send_comp;
 403
 404         case IB_WR_LOCAL_INV:
 405                 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
 406                         if (rvt_invalidate_rkey(sqp,
 407                                                 wqe->wr.ex.invalidate_rkey))
 408                                 send_status = IB_WC_LOC_PROT_ERR;
 409                         local_ops = 1;
 410                 }
 411                 goto send_comp;
 412
 413         case IB_WR_SEND_WITH_INV:
 414                 if (!rvt_invalidate_rkey(qp, wqe->wr.ex.invalidate_rkey)) {
 415                         wc.wc_flags = IB_WC_WITH_INVALIDATE;
 416                         wc.ex.invalidate_rkey = wqe->wr.ex.invalidate_rkey;
 417                 }
 418                 goto send;
 419
 420         case IB_WR_SEND_WITH_IMM:
 421                 wc.wc_flags = IB_WC_WITH_IMM;
 422                 wc.ex.imm_data = wqe->wr.ex.imm_data;
 423                 /* FALLTHROUGH */
 424         case IB_WR_SEND:
 425 send:
 426                 ret = hfi1_rvt_get_rwqe(qp, 0);
 427                 if (ret < 0)
 428                         goto op_err;
 429                 if (!ret)
 430                         goto rnr_nak;
 431                 break;
 432
 433         case IB_WR_RDMA_WRITE_WITH_IMM:
 434                 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
 435                         goto inv_err;
 436                 wc.wc_flags = IB_WC_WITH_IMM;
 437                 wc.ex.imm_data = wqe->wr.ex.imm_data;
 438                 ret = hfi1_rvt_get_rwqe(qp, 1);
 439                 if (ret < 0)
 440                         goto op_err;
 441                 if (!ret)
 442                         goto rnr_nak;
 443                 /* skip copy_last set and qp_access_flags recheck */
 444                 goto do_write;
 445         case IB_WR_RDMA_WRITE:
 446                 copy_last = rvt_is_user_qp(qp);
 447                 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
 448                         goto inv_err;
 449 do_write:
 450                 if (wqe->length == 0)
 451                         break;
 452                 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length,
 453                                           wqe->rdma_wr.remote_addr,
 454                                           wqe->rdma_wr.rkey,
 455                                           IB_ACCESS_REMOTE_WRITE)))
 456                         goto acc_err;
 457                 qp->r_sge.sg_list = NULL;
 458                 qp->r_sge.num_sge = 1;
 459                 qp->r_sge.total_len = wqe->length;
 460                 break;
 461
 462         case IB_WR_RDMA_READ:
 463                 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
 464                         goto inv_err;
 465                 if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length,
 466                                           wqe->rdma_wr.remote_addr,
 467                                           wqe->rdma_wr.rkey,
 468                                           IB_ACCESS_REMOTE_READ)))
 469                         goto acc_err;
 470                 release = false;
 471                 sqp->s_sge.sg_list = NULL;
 472                 sqp->s_sge.num_sge = 1;
 473                 qp->r_sge.sge = wqe->sg_list[0];
 474                 qp->r_sge.sg_list = wqe->sg_list + 1;
 475                 qp->r_sge.num_sge = wqe->wr.num_sge;
 476                 qp->r_sge.total_len = wqe->length;
 477                 break;
 478
 479         case IB_WR_ATOMIC_CMP_AND_SWP:
 480         case IB_WR_ATOMIC_FETCH_AND_ADD:
 481                 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
 482                         goto inv_err;
 483                 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
 484                                           wqe->atomic_wr.remote_addr,
 485                                           wqe->atomic_wr.rkey,
 486                                           IB_ACCESS_REMOTE_ATOMIC)))
 487                         goto acc_err;
 488                 /* Perform atomic OP and save result. */
 489                 maddr = (atomic64_t *)qp->r_sge.sge.vaddr;
 490                 sdata = wqe->atomic_wr.compare_add;
 491                 *(u64 *)sqp->s_sge.sge.vaddr =
 492                         (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ?
 493                         (u64)atomic64_add_return(sdata, maddr) - sdata :
 494                         (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr,
 495                                       sdata, wqe->atomic_wr.swap);
 496                 rvt_put_mr(qp->r_sge.sge.mr);
 497                 qp->r_sge.num_sge = 0;
 498                 goto send_comp;
 499
 500         default:
 501                 send_status = IB_WC_LOC_QP_OP_ERR;
 502                 goto serr;
 503         }
 504
 505         sge = &sqp->s_sge.sge;
 506         while (sqp->s_len) {
 507                 u32 len = sqp->s_len;
 508
 509                 if (len > sge->length)
 510                         len = sge->length;
 511                 if (len > sge->sge_length)
 512                         len = sge->sge_length;
 513                 WARN_ON_ONCE(len == 0);
 514                 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, release, copy_last);
 515                 sge->vaddr += len;
 516                 sge->length -= len;
 517                 sge->sge_length -= len;
 518                 if (sge->sge_length == 0) {
 519                         if (!release)
 520                                 rvt_put_mr(sge->mr);
 521                         if (--sqp->s_sge.num_sge)
 522                                 *sge = *sqp->s_sge.sg_list++;
 523                 } else if (sge->length == 0 && sge->mr->lkey) {
 524                         if (++sge->n >= RVT_SEGSZ) {
 525                                 if (++sge->m >= sge->mr->mapsz)
 526                                         break;
 527                                 sge->n = 0;
 528                         }
 529                         sge->vaddr =
 530                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 531                         sge->length =
 532                                 sge->mr->map[sge->m]->segs[sge->n].length;
 533                 }
 534                 sqp->s_len -= len;
 535         }
 536         if (release)
 537                 rvt_put_ss(&qp->r_sge);
 538
 539         if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
 540                 goto send_comp;
 541
 542         if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
 543                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 544         else
 545                 wc.opcode = IB_WC_RECV;
 546         wc.wr_id = qp->r_wr_id;
 547         wc.status = IB_WC_SUCCESS;
 548         wc.byte_len = wqe->length;
 549         wc.qp = &qp->ibqp;
 550         wc.src_qp = qp->remote_qpn;
 551         wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
 552         wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
 553         wc.port_num = 1;
 554         /* Signal completion event if the solicited bit is set. */
 555         rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
 556                      wqe->wr.send_flags & IB_SEND_SOLICITED);
 557
 558 send_comp:
 559         spin_lock_irqsave(&sqp->s_lock, flags);
 560         ibp->rvp.n_loop_pkts++;
 561 flush_send:
 562         sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
 563         hfi1_send_complete(sqp, wqe, send_status);
 564         if (local_ops) {
 565                 atomic_dec(&sqp->local_ops_pending);
 566                 local_ops = 0;
 567         }
 568         goto again;
 569
 570 rnr_nak:
 571         /* Handle RNR NAK */
 572         if (qp->ibqp.qp_type == IB_QPT_UC)
 573                 goto send_comp;
 574         ibp->rvp.n_rnr_naks++;
 575         /*
 576          * Note: we don't need the s_lock held since the BUSY flag
 577          * makes this single threaded.
 578          */
 579         if (sqp->s_rnr_retry == 0) {
 580                 send_status = IB_WC_RNR_RETRY_EXC_ERR;
 581                 goto serr;
 582         }
 583         if (sqp->s_rnr_retry_cnt < 7)
 584                 sqp->s_rnr_retry--;
 585         spin_lock_irqsave(&sqp->s_lock, flags);
 586         if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK))
 587                 goto clr_busy;
 588         rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer <<
 589                                 IB_AETH_CREDIT_SHIFT);
 590         goto clr_busy;
 591
 592 op_err:
 593         send_status = IB_WC_REM_OP_ERR;
 594         wc.status = IB_WC_LOC_QP_OP_ERR;
 595         goto err;
 596
 597 inv_err:
 598         send_status = IB_WC_REM_INV_REQ_ERR;
 599         wc.status = IB_WC_LOC_QP_OP_ERR;
 600         goto err;
 601
 602 acc_err:
 603         send_status = IB_WC_REM_ACCESS_ERR;
 604         wc.status = IB_WC_LOC_PROT_ERR;
 605 err:
 606         /* responder goes to error state */
 607         rvt_rc_error(qp, wc.status);
 608
 609 serr:
 610         spin_lock_irqsave(&sqp->s_lock, flags);
 611         hfi1_send_complete(sqp, wqe, send_status);
 612         if (sqp->ibqp.qp_type == IB_QPT_RC) {
 613                 int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR);
 614
 615                 sqp->s_flags &= ~RVT_S_BUSY;
 616                 spin_unlock_irqrestore(&sqp->s_lock, flags);
 617                 if (lastwqe) {
 618                         struct ib_event ev;
 619
 620                         ev.device = sqp->ibqp.device;
 621                         ev.element.qp = &sqp->ibqp;
 622                         ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
 623                         sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context);
 624                 }
 625                 goto done;
 626         }
 627 clr_busy:
 628         sqp->s_flags &= ~RVT_S_BUSY;
 629 unlock:
 630         spin_unlock_irqrestore(&sqp->s_lock, flags);
 631 done:
 632         rcu_read_unlock();
 633 }
 634
 635 /**
 636  * hfi1_make_grh - construct a GRH header
 637  * @ibp: a pointer to the IB port
 638  * @hdr: a pointer to the GRH header being constructed
 639  * @grh: the global route address to send to
 640  * @hwords: size of header after grh being sent in dwords
 641  * @nwords: the number of 32 bit words of data being sent
 642  *
 643  * Return the size of the header in 32 bit words.
 644  */
 645 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr,
 646                   const struct ib_global_route *grh, u32 hwords, u32 nwords)
 647 {
 648         hdr->version_tclass_flow =
 649                 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
 650                             (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
 651                             (grh->flow_label << IB_GRH_FLOW_SHIFT));
 652         hdr->paylen = cpu_to_be16((hwords + nwords) << 2);
 653         /* next_hdr is defined by C8-7 in ch. 8.4.1 */
 654         hdr->next_hdr = IB_GRH_NEXT_HDR;
 655         hdr->hop_limit = grh->hop_limit;
 656         /* The SGID is 32-bit aligned. */
 657         hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
 658         hdr->sgid.global.interface_id =
 659                 grh->sgid_index < HFI1_GUIDS_PER_PORT ?
 660                 get_sguid(ibp, grh->sgid_index) :
 661                 get_sguid(ibp, HFI1_PORT_GUID_INDEX);
 662         hdr->dgid = grh->dgid;
 663
 664         /* GRH header size in 32-bit words. */
 665         return sizeof(struct ib_grh) / sizeof(u32);
 666 }
 667
 668 #define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \
 669                               hdr.ibh.u.oth.bth[2]) / 4)
 670
 671 /**
 672  * build_ahg - create ahg in s_ahg
 673  * @qp: a pointer to QP
 674  * @npsn: the next PSN for the request/response
 675  *
 676  * This routine handles the AHG by allocating an ahg entry and causing the
 677  * copy of the first middle.
 678  *
 679  * Subsequent middles use the copied entry, editing the
 680  * PSN with 1 or 2 edits.
 681  */
 682 static inline void build_ahg(struct rvt_qp *qp, u32 npsn)
 683 {
 684         struct hfi1_qp_priv *priv = qp->priv;
 685
 686         if (unlikely(qp->s_flags & RVT_S_AHG_CLEAR))
 687                 clear_ahg(qp);
 688         if (!(qp->s_flags & RVT_S_AHG_VALID)) {
 689                 /* first middle that needs copy  */
 690                 if (qp->s_ahgidx < 0)
 691                         qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde);
 692                 if (qp->s_ahgidx >= 0) {
 693                         qp->s_ahgpsn = npsn;
 694                         priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY;
 695                         /* save to protect a change in another thread */
 696                         priv->s_ahg->ahgidx = qp->s_ahgidx;
 697                         qp->s_flags |= RVT_S_AHG_VALID;
 698                 }
 699         } else {
 700                 /* subsequent middle after valid */
 701                 if (qp->s_ahgidx >= 0) {
 702                         priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG;
 703                         priv->s_ahg->ahgidx = qp->s_ahgidx;
 704                         priv->s_ahg->ahgcount++;
 705                         priv->s_ahg->ahgdesc[0] =
 706                                 sdma_build_ahg_descriptor(
 707                                         (__force u16)cpu_to_be16((u16)npsn),
 708                                         BTH2_OFFSET,
 709                                         16,
 710                                         16);
 711                         if ((npsn & 0xffff0000) !=
 712                                         (qp->s_ahgpsn & 0xffff0000)) {
 713                                 priv->s_ahg->ahgcount++;
 714                                 priv->s_ahg->ahgdesc[1] =
 715                                         sdma_build_ahg_descriptor(
 716                                                 (__force u16)cpu_to_be16(
 717                                                         (u16)(npsn >> 16)),
 718                                                 BTH2_OFFSET,
 719                                                 0,
 720                                                 16);
 721                         }
 722                 }
 723         }
 724 }
 725
 726 static inline void hfi1_make_ruc_bth(struct rvt_qp *qp,
 727                                      struct ib_other_headers *ohdr,
 728                                      u32 bth0, u32 bth1, u32 bth2)
 729 {
 730         bth1 |= qp->remote_qpn;
 731         ohdr->bth[0] = cpu_to_be32(bth0);
 732         ohdr->bth[1] = cpu_to_be32(bth1);
 733         ohdr->bth[2] = cpu_to_be32(bth2);
 734 }
 735
 736 static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp,
 737                                             struct ib_other_headers *ohdr,
 738                                             u32 bth0, u32 bth2, int middle,
 739                                             struct hfi1_pkt_state *ps)
 740 {
 741         struct hfi1_qp_priv *priv = qp->priv;
 742         struct hfi1_ibport *ibp = ps->ibp;
 743         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 744         u32 bth1 = 0;
 745         u32 slid;
 746         u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
 747         u8 l4 = OPA_16B_L4_IB_LOCAL;
 748         u8 extra_bytes = hfi1_get_16b_padding(
 749                                 (ps->s_txreq->hdr_dwords << 2),
 750                                 ps->s_txreq->s_cur_size);
 751         u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size +
 752                                  extra_bytes + SIZE_OF_LT) >> 2);
 753         bool becn = false;
 754
 755         if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
 756             hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) {
 757                 struct ib_grh *grh;
 758                 struct ib_global_route *grd =
 759                         rdma_ah_retrieve_grh(&qp->remote_ah_attr);
 760                 /*
 761                  * Ensure OPA GIDs are transformed to IB gids
 762                  * before creating the GRH.
 763                  */
 764                 if (grd->sgid_index == OPA_GID_INDEX)
 765                         grd->sgid_index = 0;
 766                 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
 767                 l4 = OPA_16B_L4_IB_GLOBAL;
 768                 ps->s_txreq->hdr_dwords +=
 769                         hfi1_make_grh(ibp, grh, grd,
 770                                       ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
 771                                       nwords);
 772                 middle = 0;
 773         }
 774
 775         if (qp->s_mig_state == IB_MIG_MIGRATED)
 776                 bth1 |= OPA_BTH_MIG_REQ;
 777         else
 778                 middle = 0;
 779
 780         if (middle)
 781                 build_ahg(qp, bth2);
 782         else
 783                 qp->s_flags &= ~RVT_S_AHG_VALID;
 784
 785         bth0 |= pkey;
 786         bth0 |= extra_bytes << 20;
 787         if (qp->s_flags & RVT_S_ECN) {
 788                 qp->s_flags &= ~RVT_S_ECN;
 789                 /* we recently received a FECN, so return a BECN */
 790                 becn = true;
 791         }
 792         hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2);
 793
 794         if (!ppd->lid)
 795                 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
 796         else
 797                 slid = ppd->lid |
 798                         (rdma_ah_get_path_bits(&qp->remote_ah_attr) &
 799                         ((1 << ppd->lmc) - 1));
 800
 801         hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
 802                           slid,
 803                           opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr),
 804                                       16B),
 805                           (ps->s_txreq->hdr_dwords + nwords) >> 1,
 806                           pkey, becn, 0, l4, priv->s_sc);
 807 }
 808
 809 static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp,
 810                                            struct ib_other_headers *ohdr,
 811                                            u32 bth0, u32 bth2, int middle,
 812                                            struct hfi1_pkt_state *ps)
 813 {
 814         struct hfi1_qp_priv *priv = qp->priv;
 815         struct hfi1_ibport *ibp = ps->ibp;
 816         u32 bth1 = 0;
 817         u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
 818         u16 lrh0 = HFI1_LRH_BTH;
 819         u8 extra_bytes = -ps->s_txreq->s_cur_size & 3;
 820         u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size +
 821                                          extra_bytes) >> 2);
 822
 823         if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
 824                 struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
 825
 826                 lrh0 = HFI1_LRH_GRH;
 827                 ps->s_txreq->hdr_dwords +=
 828                         hfi1_make_grh(ibp, grh,
 829                                       rdma_ah_read_grh(&qp->remote_ah_attr),
 830                                       ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
 831                                       nwords);
 832                 middle = 0;
 833         }
 834         lrh0 |= (priv->s_sc & 0xf) << 12 |
 835                 (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4;
 836
 837         if (qp->s_mig_state == IB_MIG_MIGRATED)
 838                 bth0 |= IB_BTH_MIG_REQ;
 839         else
 840                 middle = 0;
 841
 842         if (middle)
 843                 build_ahg(qp, bth2);
 844         else
 845                 qp->s_flags &= ~RVT_S_AHG_VALID;
 846
 847         bth0 |= pkey;
 848         bth0 |= extra_bytes << 20;
 849         if (qp->s_flags & RVT_S_ECN) {
 850                 qp->s_flags &= ~RVT_S_ECN;
 851                 /* we recently received a FECN, so return a BECN */
 852                 bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT);
 853         }
 854         hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2);
 855         hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
 856                          lrh0,
 857                          ps->s_txreq->hdr_dwords + nwords,
 858                          opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B),
 859                          ppd_from_ibp(ibp)->lid |
 860                                 rdma_ah_get_path_bits(&qp->remote_ah_attr));
 861 }
 862
 863 typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp,
 864                                   struct ib_other_headers *ohdr,
 865                                   u32 bth0, u32 bth2, int middle,
 866                                   struct hfi1_pkt_state *ps);
 867
 868 /* We support only two types - 9B and 16B for now */
 869 static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = {
 870         [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B,
 871         [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B
 872 };
 873
 874 void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
 875                           u32 bth0, u32 bth2, int middle,
 876                           struct hfi1_pkt_state *ps)
 877 {
 878         struct hfi1_qp_priv *priv = qp->priv;
 879
 880         /*
 881          * reset s_ahg/AHG fields
 882          *
 883          * This insures that the ahgentry/ahgcount
 884          * are at a non-AHG default to protect
 885          * build_verbs_tx_desc() from using
 886          * an include ahgidx.
 887          *
 888          * build_ahg() will modify as appropriate
 889          * to use the AHG feature.
 890          */
 891         priv->s_ahg->tx_flags = 0;
 892         priv->s_ahg->ahgcount = 0;
 893         priv->s_ahg->ahgidx = 0;
 894
 895         /* Make the appropriate header */
 896         hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth2, middle, ps);
 897 }
 898
 899 /* when sending, force a reschedule every one of these periods */
 900 #define SEND_RESCHED_TIMEOUT (5 * HZ)  /* 5s in jiffies */
 901
 902 /**
 903  * schedule_send_yield - test for a yield required for QP send engine
 904  * @timeout: Final time for timeout slice for jiffies
 905  * @qp: a pointer to QP
 906  * @ps: a pointer to a structure with commonly lookup values for
 907  *      the the send engine progress
 908  *
 909  * This routine checks if the time slice for the QP has expired
 910  * for RC QPs, if so an additional work entry is queued. At this
 911  * point, other QPs have an opportunity to be scheduled. It
 912  * returns true if a yield is required, otherwise, false
 913  * is returned.
 914  */
 915 static bool schedule_send_yield(struct rvt_qp *qp,
 916                                 struct hfi1_pkt_state *ps)
 917 {
 918         ps->pkts_sent = true;
 919
 920         if (unlikely(time_after(jiffies, ps->timeout))) {
 921                 if (!ps->in_thread ||
 922                     workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) {
 923                         spin_lock_irqsave(&qp->s_lock, ps->flags);
 924                         qp->s_flags &= ~RVT_S_BUSY;
 925                         hfi1_schedule_send(qp);
 926                         spin_unlock_irqrestore(&qp->s_lock, ps->flags);
 927                         this_cpu_inc(*ps->ppd->dd->send_schedule);
 928                         trace_hfi1_rc_expired_time_slice(qp, true);
 929                         return true;
 930                 }
 931
 932                 cond_resched();
 933                 this_cpu_inc(*ps->ppd->dd->send_schedule);
 934                 ps->timeout = jiffies + ps->timeout_int;
 935         }
 936
 937         trace_hfi1_rc_expired_time_slice(qp, false);
 938         return false;
 939 }
 940
 941 void hfi1_do_send_from_rvt(struct rvt_qp *qp)
 942 {
 943         hfi1_do_send(qp, false);
 944 }
 945
 946 void _hfi1_do_send(struct work_struct *work)
 947 {
 948         struct iowait *wait = container_of(work, struct iowait, iowork);
 949         struct rvt_qp *qp = iowait_to_qp(wait);
 950
 951         hfi1_do_send(qp, true);
 952 }
 953
 954 /**
 955  * hfi1_do_send - perform a send on a QP
 956  * @work: contains a pointer to the QP
 957  * @in_thread: true if in a workqueue thread
 958  *
 959  * Process entries in the send work queue until credit or queue is
 960  * exhausted.  Only allow one CPU to send a packet per QP.
 961  * Otherwise, two threads could send packets out of order.
 962  */
 963 void hfi1_do_send(struct rvt_qp *qp, bool in_thread)
 964 {
 965         struct hfi1_pkt_state ps;
 966         struct hfi1_qp_priv *priv = qp->priv;
 967         int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps);
 968
 969         ps.dev = to_idev(qp->ibqp.device);
 970         ps.ibp = to_iport(qp->ibqp.device, qp->port_num);
 971         ps.ppd = ppd_from_ibp(ps.ibp);
 972         ps.in_thread = in_thread;
 973
 974         trace_hfi1_rc_do_send(qp, in_thread);
 975
 976         switch (qp->ibqp.qp_type) {
 977         case IB_QPT_RC:
 978                 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) &
 979                                    ~((1 << ps.ppd->lmc) - 1)) ==
 980                                   ps.ppd->lid)) {
 981                         ruc_loopback(qp);
 982                         return;
 983                 }
 984                 make_req = hfi1_make_rc_req;
 985                 ps.timeout_int = qp->timeout_jiffies;
 986                 break;
 987         case IB_QPT_UC:
 988                 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) &
 989                                    ~((1 << ps.ppd->lmc) - 1)) ==
 990                                   ps.ppd->lid)) {
 991                         ruc_loopback(qp);
 992                         return;
 993                 }
 994                 make_req = hfi1_make_uc_req;
 995                 ps.timeout_int = SEND_RESCHED_TIMEOUT;
 996                 break;
 997         default:
 998                 make_req = hfi1_make_ud_req;
 999                 ps.timeout_int = SEND_RESCHED_TIMEOUT;
1000         }
1001
1002         spin_lock_irqsave(&qp->s_lock, ps.flags);
1003
1004         /* Return if we are already busy processing a work request. */
1005         if (!hfi1_send_ok(qp)) {
1006                 spin_unlock_irqrestore(&qp->s_lock, ps.flags);
1007                 return;
1008         }
1009
1010         qp->s_flags |= RVT_S_BUSY;
1011
1012         ps.timeout_int = ps.timeout_int / 8;
1013         ps.timeout = jiffies + ps.timeout_int;
1014         ps.cpu = priv->s_sde ? priv->s_sde->cpu :
1015                         cpumask_first(cpumask_of_node(ps.ppd->dd->node));
1016         ps.pkts_sent = false;
1017
1018         /* insure a pre-built packet is handled  */
1019         ps.s_txreq = get_waiting_verbs_txreq(qp);
1020         do {
1021                 /* Check for a constructed packet to be sent. */
1022                 if (ps.s_txreq) {
1023                         spin_unlock_irqrestore(&qp->s_lock, ps.flags);
1024                         /*
1025                          * If the packet cannot be sent now, return and
1026                          * the send engine will be woken up later.
1027                          */
1028                         if (hfi1_verbs_send(qp, &ps))
1029                                 return;
1030                         /* allow other tasks to run */
1031                         if (schedule_send_yield(qp, &ps))
1032                                 return;
1033
1034                         spin_lock_irqsave(&qp->s_lock, ps.flags);
1035                 }
1036         } while (make_req(qp, &ps));
1037         iowait_starve_clear(ps.pkts_sent, &priv->s_iowait);
1038         spin_unlock_irqrestore(&qp->s_lock, ps.flags);
1039 }
1040
1041 /*
1042  * This should be called with s_lock held.
1043  */
1044 void hfi1_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
1045                         enum ib_wc_status status)
1046 {
1047         u32 old_last, last;
1048
1049         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND))
1050                 return;
1051
1052         last = qp->s_last;
1053         old_last = last;
1054         trace_hfi1_qp_send_completion(qp, wqe, last);
1055         if (++last >= qp->s_size)
1056                 last = 0;
1057         trace_hfi1_qp_send_completion(qp, wqe, last);
1058         qp->s_last = last;
1059         /* See post_send() */
1060         barrier();
1061         rvt_put_swqe(wqe);
1062         if (qp->ibqp.qp_type == IB_QPT_UD ||
1063             qp->ibqp.qp_type == IB_QPT_SMI ||
1064             qp->ibqp.qp_type == IB_QPT_GSI)
1065                 atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount);
1066
1067         rvt_qp_swqe_complete(qp,
1068                              wqe,
1069                              ib_hfi1_wc_opcode[wqe->wr.opcode],
1070                              status);
1071
1072         if (qp->s_acked == old_last)
1073                 qp->s_acked = last;
1074         if (qp->s_cur == old_last)
1075                 qp->s_cur = last;
1076         if (qp->s_tail == old_last)
1077                 qp->s_tail = last;
1078         if (qp->state == IB_QPS_SQD && last == qp->s_cur)
1079                 qp->s_draining = 0;
1080 }