drivers/infiniband/sw/rxe/rxe_req.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   4  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   5  */
   6
   7 #include <linux/skbuff.h>
   8 #include <crypto/hash.h>
   9
  10 #include "rxe.h"
  11 #include "rxe_loc.h"
  12 #include "rxe_queue.h"
  13
  14 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
  15                        u32 opcode);
  16
  17 static inline void retry_first_write_send(struct rxe_qp *qp,
  18                                           struct rxe_send_wqe *wqe, int npsn)
  19 {
  20         int i;
  21
  22         for (i = 0; i < npsn; i++) {
  23                 int to_send = (wqe->dma.resid > qp->mtu) ?
  24                                 qp->mtu : wqe->dma.resid;
  25
  26                 qp->req.opcode = next_opcode(qp, wqe,
  27                                              wqe->wr.opcode);
  28
  29                 if (wqe->wr.send_flags & IB_SEND_INLINE) {
  30                         wqe->dma.resid -= to_send;
  31                         wqe->dma.sge_offset += to_send;
  32                 } else {
  33                         advance_dma_data(&wqe->dma, to_send);
  34                 }
  35         }
  36 }
  37
  38 static void req_retry(struct rxe_qp *qp)
  39 {
  40         struct rxe_send_wqe *wqe;
  41         unsigned int wqe_index;
  42         unsigned int mask;
  43         int npsn;
  44         int first = 1;
  45         struct rxe_queue *q = qp->sq.queue;
  46         unsigned int cons;
  47         unsigned int prod;
  48
  49         cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT);
  50         prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT);
  51
  52         qp->req.wqe_index       = cons;
  53         qp->req.psn             = qp->comp.psn;
  54         qp->req.opcode          = -1;
  55
  56         for (wqe_index = cons; wqe_index != prod;
  57                         wqe_index = queue_next_index(q, wqe_index)) {
  58                 wqe = queue_addr_from_index(qp->sq.queue, wqe_index);
  59                 mask = wr_opcode_mask(wqe->wr.opcode, qp);
  60
  61                 if (wqe->state == wqe_state_posted)
  62                         break;
  63
  64                 if (wqe->state == wqe_state_done)
  65                         continue;
  66
  67                 wqe->iova = (mask & WR_ATOMIC_MASK) ?
  68                              wqe->wr.wr.atomic.remote_addr :
  69                              (mask & WR_READ_OR_WRITE_MASK) ?
  70                              wqe->wr.wr.rdma.remote_addr :
  71                              0;
  72
  73                 if (!first || (mask & WR_READ_MASK) == 0) {
  74                         wqe->dma.resid = wqe->dma.length;
  75                         wqe->dma.cur_sge = 0;
  76                         wqe->dma.sge_offset = 0;
  77                 }
  78
  79                 if (first) {
  80                         first = 0;
  81
  82                         if (mask & WR_WRITE_OR_SEND_MASK) {
  83                                 npsn = (qp->comp.psn - wqe->first_psn) &
  84                                         BTH_PSN_MASK;
  85                                 retry_first_write_send(qp, wqe, npsn);
  86                         }
  87
  88                         if (mask & WR_READ_MASK) {
  89                                 npsn = (wqe->dma.length - wqe->dma.resid) /
  90                                         qp->mtu;
  91                                 wqe->iova += npsn * qp->mtu;
  92                         }
  93                 }
  94
  95                 wqe->state = wqe_state_posted;
  96         }
  97 }
  98
  99 void rnr_nak_timer(struct timer_list *t)
 100 {
 101         struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer);
 102         unsigned long flags;
 103
 104         rxe_dbg_qp(qp, "nak timer fired\n");
 105
 106         spin_lock_irqsave(&qp->state_lock, flags);
 107         if (qp->valid) {
 108                 /* request a send queue retry */
 109                 qp->req.need_retry = 1;
 110                 qp->req.wait_for_rnr_timer = 0;
 111                 rxe_sched_task(&qp->send_task);
 112         }
 113         spin_unlock_irqrestore(&qp->state_lock, flags);
 114 }
 115
 116 static void req_check_sq_drain_done(struct rxe_qp *qp)
 117 {
 118         struct rxe_queue *q;
 119         unsigned int index;
 120         unsigned int cons;
 121         struct rxe_send_wqe *wqe;
 122         unsigned long flags;
 123
 124         spin_lock_irqsave(&qp->state_lock, flags);
 125         if (qp_state(qp) == IB_QPS_SQD) {
 126                 q = qp->sq.queue;
 127                 index = qp->req.wqe_index;
 128                 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT);
 129                 wqe = queue_addr_from_index(q, cons);
 130
 131                 /* check to see if we are drained;
 132                  * state_lock used by requester and completer
 133                  */
 134                 do {
 135                         if (!qp->attr.sq_draining)
 136                                 /* comp just finished */
 137                                 break;
 138
 139                         if (wqe && ((index != cons) ||
 140                                 (wqe->state != wqe_state_posted)))
 141                                 /* comp not done yet */
 142                                 break;
 143
 144                         qp->attr.sq_draining = 0;
 145                         spin_unlock_irqrestore(&qp->state_lock, flags);
 146
 147                         if (qp->ibqp.event_handler) {
 148                                 struct ib_event ev;
 149
 150                                 ev.device = qp->ibqp.device;
 151                                 ev.element.qp = &qp->ibqp;
 152                                 ev.event = IB_EVENT_SQ_DRAINED;
 153                                 qp->ibqp.event_handler(&ev,
 154                                         qp->ibqp.qp_context);
 155                         }
 156                         return;
 157                 } while (0);
 158         }
 159         spin_unlock_irqrestore(&qp->state_lock, flags);
 160 }
 161
 162 static struct rxe_send_wqe *__req_next_wqe(struct rxe_qp *qp)
 163 {
 164         struct rxe_queue *q = qp->sq.queue;
 165         unsigned int index = qp->req.wqe_index;
 166         unsigned int prod;
 167
 168         prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT);
 169         if (index == prod)
 170                 return NULL;
 171         else
 172                 return queue_addr_from_index(q, index);
 173 }
 174
 175 static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp)
 176 {
 177         struct rxe_send_wqe *wqe;
 178         unsigned long flags;
 179
 180         req_check_sq_drain_done(qp);
 181
 182         wqe = __req_next_wqe(qp);
 183         if (wqe == NULL)
 184                 return NULL;
 185
 186         spin_lock_irqsave(&qp->state_lock, flags);
 187         if (unlikely((qp_state(qp) == IB_QPS_SQD) &&
 188                      (wqe->state != wqe_state_processing))) {
 189                 spin_unlock_irqrestore(&qp->state_lock, flags);
 190                 return NULL;
 191         }
 192         spin_unlock_irqrestore(&qp->state_lock, flags);
 193
 194         wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp);
 195         return wqe;
 196 }
 197
 198 /**
 199  * rxe_wqe_is_fenced - check if next wqe is fenced
 200  * @qp: the queue pair
 201  * @wqe: the next wqe
 202  *
 203  * Returns: 1 if wqe needs to wait
 204  *          0 if wqe is ready to go
 205  */
 206 static int rxe_wqe_is_fenced(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
 207 {
 208         /* Local invalidate fence (LIF) see IBA 10.6.5.1
 209          * Requires ALL previous operations on the send queue
 210          * are complete. Make mandatory for the rxe driver.
 211          */
 212         if (wqe->wr.opcode == IB_WR_LOCAL_INV)
 213                 return qp->req.wqe_index != queue_get_consumer(qp->sq.queue,
 214                                                 QUEUE_TYPE_FROM_CLIENT);
 215
 216         /* Fence see IBA 10.8.3.3
 217          * Requires that all previous read and atomic operations
 218          * are complete.
 219          */
 220         return (wqe->wr.send_flags & IB_SEND_FENCE) &&
 221                 atomic_read(&qp->req.rd_atomic) != qp->attr.max_rd_atomic;
 222 }
 223
 224 static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits)
 225 {
 226         switch (opcode) {
 227         case IB_WR_RDMA_WRITE:
 228                 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
 229                     qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
 230                         return fits ?
 231                                 IB_OPCODE_RC_RDMA_WRITE_LAST :
 232                                 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
 233                 else
 234                         return fits ?
 235                                 IB_OPCODE_RC_RDMA_WRITE_ONLY :
 236                                 IB_OPCODE_RC_RDMA_WRITE_FIRST;
 237
 238         case IB_WR_RDMA_WRITE_WITH_IMM:
 239                 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
 240                     qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
 241                         return fits ?
 242                                 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
 243                                 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
 244                 else
 245                         return fits ?
 246                                 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
 247                                 IB_OPCODE_RC_RDMA_WRITE_FIRST;
 248
 249         case IB_WR_SEND:
 250                 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
 251                     qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
 252                         return fits ?
 253                                 IB_OPCODE_RC_SEND_LAST :
 254                                 IB_OPCODE_RC_SEND_MIDDLE;
 255                 else
 256                         return fits ?
 257                                 IB_OPCODE_RC_SEND_ONLY :
 258                                 IB_OPCODE_RC_SEND_FIRST;
 259
 260         case IB_WR_SEND_WITH_IMM:
 261                 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
 262                     qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
 263                         return fits ?
 264                                 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE :
 265                                 IB_OPCODE_RC_SEND_MIDDLE;
 266                 else
 267                         return fits ?
 268                                 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE :
 269                                 IB_OPCODE_RC_SEND_FIRST;
 270
 271         case IB_WR_FLUSH:
 272                 return IB_OPCODE_RC_FLUSH;
 273
 274         case IB_WR_RDMA_READ:
 275                 return IB_OPCODE_RC_RDMA_READ_REQUEST;
 276
 277         case IB_WR_ATOMIC_CMP_AND_SWP:
 278                 return IB_OPCODE_RC_COMPARE_SWAP;
 279
 280         case IB_WR_ATOMIC_FETCH_AND_ADD:
 281                 return IB_OPCODE_RC_FETCH_ADD;
 282
 283         case IB_WR_SEND_WITH_INV:
 284                 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
 285                     qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
 286                         return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE :
 287                                 IB_OPCODE_RC_SEND_MIDDLE;
 288                 else
 289                         return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE :
 290                                 IB_OPCODE_RC_SEND_FIRST;
 291
 292         case IB_WR_ATOMIC_WRITE:
 293                 return IB_OPCODE_RC_ATOMIC_WRITE;
 294
 295         case IB_WR_REG_MR:
 296         case IB_WR_LOCAL_INV:
 297                 return opcode;
 298         }
 299
 300         return -EINVAL;
 301 }
 302
 303 static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits)
 304 {
 305         switch (opcode) {
 306         case IB_WR_RDMA_WRITE:
 307                 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
 308                     qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
 309                         return fits ?
 310                                 IB_OPCODE_UC_RDMA_WRITE_LAST :
 311                                 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
 312                 else
 313                         return fits ?
 314                                 IB_OPCODE_UC_RDMA_WRITE_ONLY :
 315                                 IB_OPCODE_UC_RDMA_WRITE_FIRST;
 316
 317         case IB_WR_RDMA_WRITE_WITH_IMM:
 318                 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
 319                     qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
 320                         return fits ?
 321                                 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
 322                                 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
 323                 else
 324                         return fits ?
 325                                 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
 326                                 IB_OPCODE_UC_RDMA_WRITE_FIRST;
 327
 328         case IB_WR_SEND:
 329                 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
 330                     qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
 331                         return fits ?
 332                                 IB_OPCODE_UC_SEND_LAST :
 333                                 IB_OPCODE_UC_SEND_MIDDLE;
 334                 else
 335                         return fits ?
 336                                 IB_OPCODE_UC_SEND_ONLY :
 337                                 IB_OPCODE_UC_SEND_FIRST;
 338
 339         case IB_WR_SEND_WITH_IMM:
 340                 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
 341                     qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
 342                         return fits ?
 343                                 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE :
 344                                 IB_OPCODE_UC_SEND_MIDDLE;
 345                 else
 346                         return fits ?
 347                                 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE :
 348                                 IB_OPCODE_UC_SEND_FIRST;
 349         }
 350
 351         return -EINVAL;
 352 }
 353
 354 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
 355                        u32 opcode)
 356 {
 357         int fits = (wqe->dma.resid <= qp->mtu);
 358
 359         switch (qp_type(qp)) {
 360         case IB_QPT_RC:
 361                 return next_opcode_rc(qp, opcode, fits);
 362
 363         case IB_QPT_UC:
 364                 return next_opcode_uc(qp, opcode, fits);
 365
 366         case IB_QPT_UD:
 367         case IB_QPT_GSI:
 368                 switch (opcode) {
 369                 case IB_WR_SEND:
 370                         return IB_OPCODE_UD_SEND_ONLY;
 371
 372                 case IB_WR_SEND_WITH_IMM:
 373                         return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
 374                 }
 375                 break;
 376
 377         default:
 378                 break;
 379         }
 380
 381         return -EINVAL;
 382 }
 383
 384 static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
 385 {
 386         int depth;
 387
 388         if (wqe->has_rd_atomic)
 389                 return 0;
 390
 391         qp->req.need_rd_atomic = 1;
 392         depth = atomic_dec_return(&qp->req.rd_atomic);
 393
 394         if (depth >= 0) {
 395                 qp->req.need_rd_atomic = 0;
 396                 wqe->has_rd_atomic = 1;
 397                 return 0;
 398         }
 399
 400         atomic_inc(&qp->req.rd_atomic);
 401         return -EAGAIN;
 402 }
 403
 404 static inline int get_mtu(struct rxe_qp *qp)
 405 {
 406         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 407
 408         if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC))
 409                 return qp->mtu;
 410
 411         return rxe->port.mtu_cap;
 412 }
 413
 414 static struct sk_buff *init_req_packet(struct rxe_qp *qp,
 415                                        struct rxe_av *av,
 416                                        struct rxe_send_wqe *wqe,
 417                                        int opcode, u32 payload,
 418                                        struct rxe_pkt_info *pkt)
 419 {
 420         struct rxe_dev          *rxe = to_rdev(qp->ibqp.device);
 421         struct sk_buff          *skb;
 422         struct rxe_send_wr      *ibwr = &wqe->wr;
 423         int                     pad = (-payload) & 0x3;
 424         int                     paylen;
 425         int                     solicited;
 426         u32                     qp_num;
 427         int                     ack_req = 0;
 428
 429         /* length from start of bth to end of icrc */
 430         paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
 431         pkt->paylen = paylen;
 432
 433         /* init skb */
 434         skb = rxe_init_packet(rxe, av, paylen, pkt);
 435         if (unlikely(!skb))
 436                 return NULL;
 437
 438         /* init bth */
 439         solicited = (ibwr->send_flags & IB_SEND_SOLICITED) &&
 440                         (pkt->mask & RXE_END_MASK) &&
 441                         ((pkt->mask & (RXE_SEND_MASK)) ||
 442                         (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) ==
 443                         (RXE_WRITE_MASK | RXE_IMMDT_MASK));
 444
 445         qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn :
 446                                          qp->attr.dest_qp_num;
 447
 448         if (qp_type(qp) != IB_QPT_UD && qp_type(qp) != IB_QPT_UC)
 449                 ack_req = ((pkt->mask & RXE_END_MASK) ||
 450                            (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK));
 451         if (ack_req)
 452                 qp->req.noack_pkts = 0;
 453
 454         bth_init(pkt, pkt->opcode, solicited, 0, pad, IB_DEFAULT_PKEY_FULL, qp_num,
 455                  ack_req, pkt->psn);
 456
 457         /* init optional headers */
 458         if (pkt->mask & RXE_RETH_MASK) {
 459                 if (pkt->mask & RXE_FETH_MASK)
 460                         reth_set_rkey(pkt, ibwr->wr.flush.rkey);
 461                 else
 462                         reth_set_rkey(pkt, ibwr->wr.rdma.rkey);
 463                 reth_set_va(pkt, wqe->iova);
 464                 reth_set_len(pkt, wqe->dma.resid);
 465         }
 466
 467         /* Fill Flush Extension Transport Header */
 468         if (pkt->mask & RXE_FETH_MASK)
 469                 feth_init(pkt, ibwr->wr.flush.type, ibwr->wr.flush.level);
 470
 471         if (pkt->mask & RXE_IMMDT_MASK)
 472                 immdt_set_imm(pkt, ibwr->ex.imm_data);
 473
 474         if (pkt->mask & RXE_IETH_MASK)
 475                 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey);
 476
 477         if (pkt->mask & RXE_ATMETH_MASK) {
 478                 atmeth_set_va(pkt, wqe->iova);
 479                 if (opcode == IB_OPCODE_RC_COMPARE_SWAP) {
 480                         atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap);
 481                         atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add);
 482                 } else {
 483                         atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add);
 484                 }
 485                 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey);
 486         }
 487
 488         if (pkt->mask & RXE_DETH_MASK) {
 489                 if (qp->ibqp.qp_num == 1)
 490                         deth_set_qkey(pkt, GSI_QKEY);
 491                 else
 492                         deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey);
 493                 deth_set_sqp(pkt, qp->ibqp.qp_num);
 494         }
 495
 496         return skb;
 497 }
 498
 499 static int finish_packet(struct rxe_qp *qp, struct rxe_av *av,
 500                          struct rxe_send_wqe *wqe, struct rxe_pkt_info *pkt,
 501                          struct sk_buff *skb, u32 payload)
 502 {
 503         int err;
 504
 505         err = rxe_prepare(av, pkt, skb);
 506         if (err)
 507                 return err;
 508
 509         if (pkt->mask & RXE_WRITE_OR_SEND_MASK) {
 510                 if (wqe->wr.send_flags & IB_SEND_INLINE) {
 511                         u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];
 512
 513                         memcpy(payload_addr(pkt), tmp, payload);
 514
 515                         wqe->dma.resid -= payload;
 516                         wqe->dma.sge_offset += payload;
 517                 } else {
 518                         err = copy_data(qp->pd, 0, &wqe->dma,
 519                                         payload_addr(pkt), payload,
 520                                         RXE_FROM_MR_OBJ);
 521                         if (err)
 522                                 return err;
 523                 }
 524                 if (bth_pad(pkt)) {
 525                         u8 *pad = payload_addr(pkt) + payload;
 526
 527                         memset(pad, 0, bth_pad(pkt));
 528                 }
 529         } else if (pkt->mask & RXE_FLUSH_MASK) {
 530                 /* oA19-2: shall have no payload. */
 531                 wqe->dma.resid = 0;
 532         }
 533
 534         if (pkt->mask & RXE_ATOMIC_WRITE_MASK) {
 535                 memcpy(payload_addr(pkt), wqe->dma.atomic_wr, payload);
 536                 wqe->dma.resid -= payload;
 537         }
 538
 539         return 0;
 540 }
 541
 542 static void update_wqe_state(struct rxe_qp *qp,
 543                 struct rxe_send_wqe *wqe,
 544                 struct rxe_pkt_info *pkt)
 545 {
 546         if (pkt->mask & RXE_END_MASK) {
 547                 if (qp_type(qp) == IB_QPT_RC)
 548                         wqe->state = wqe_state_pending;
 549                 else
 550                         wqe->state = wqe_state_done;
 551         } else {
 552                 wqe->state = wqe_state_processing;
 553         }
 554 }
 555
 556 static void update_wqe_psn(struct rxe_qp *qp,
 557                            struct rxe_send_wqe *wqe,
 558                            struct rxe_pkt_info *pkt,
 559                            u32 payload)
 560 {
 561         /* number of packets left to send including current one */
 562         int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu;
 563
 564         /* handle zero length packet case */
 565         if (num_pkt == 0)
 566                 num_pkt = 1;
 567
 568         if (pkt->mask & RXE_START_MASK) {
 569                 wqe->first_psn = qp->req.psn;
 570                 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK;
 571         }
 572
 573         if (pkt->mask & RXE_READ_MASK)
 574                 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK;
 575         else
 576                 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
 577 }
 578
 579 static void update_state(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 580 {
 581         qp->req.opcode = pkt->opcode;
 582
 583         if (pkt->mask & RXE_END_MASK)
 584                 qp->req.wqe_index = queue_next_index(qp->sq.queue,
 585                                                      qp->req.wqe_index);
 586
 587         qp->need_req_skb = 0;
 588
 589         if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer))
 590                 mod_timer(&qp->retrans_timer,
 591                           jiffies + qp->qp_timeout_jiffies);
 592 }
 593
 594 static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
 595 {
 596         u8 opcode = wqe->wr.opcode;
 597         u32 rkey;
 598         int ret;
 599
 600         switch (opcode) {
 601         case IB_WR_LOCAL_INV:
 602                 rkey = wqe->wr.ex.invalidate_rkey;
 603                 if (rkey_is_mw(rkey))
 604                         ret = rxe_invalidate_mw(qp, rkey);
 605                 else
 606                         ret = rxe_invalidate_mr(qp, rkey);
 607
 608                 if (unlikely(ret)) {
 609                         wqe->status = IB_WC_LOC_QP_OP_ERR;
 610                         return ret;
 611                 }
 612                 break;
 613         case IB_WR_REG_MR:
 614                 ret = rxe_reg_fast_mr(qp, wqe);
 615                 if (unlikely(ret)) {
 616                         wqe->status = IB_WC_LOC_QP_OP_ERR;
 617                         return ret;
 618                 }
 619                 break;
 620         case IB_WR_BIND_MW:
 621                 ret = rxe_bind_mw(qp, wqe);
 622                 if (unlikely(ret)) {
 623                         wqe->status = IB_WC_MW_BIND_ERR;
 624                         return ret;
 625                 }
 626                 break;
 627         default:
 628                 rxe_dbg_qp(qp, "Unexpected send wqe opcode %d\n", opcode);
 629                 wqe->status = IB_WC_LOC_QP_OP_ERR;
 630                 return -EINVAL;
 631         }
 632
 633         wqe->state = wqe_state_done;
 634         wqe->status = IB_WC_SUCCESS;
 635         qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
 636
 637         return 0;
 638 }
 639
 640 int rxe_requester(struct rxe_qp *qp)
 641 {
 642         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 643         struct rxe_pkt_info pkt;
 644         struct sk_buff *skb;
 645         struct rxe_send_wqe *wqe;
 646         enum rxe_hdr_mask mask;
 647         u32 payload;
 648         int mtu;
 649         int opcode;
 650         int err;
 651         int ret;
 652         struct rxe_queue *q = qp->sq.queue;
 653         struct rxe_ah *ah;
 654         struct rxe_av *av;
 655         unsigned long flags;
 656
 657         spin_lock_irqsave(&qp->state_lock, flags);
 658         if (unlikely(!qp->valid)) {
 659                 spin_unlock_irqrestore(&qp->state_lock, flags);
 660                 goto exit;
 661         }
 662
 663         if (unlikely(qp_state(qp) == IB_QPS_ERR)) {
 664                 wqe = __req_next_wqe(qp);
 665                 spin_unlock_irqrestore(&qp->state_lock, flags);
 666                 if (wqe) {
 667                         wqe->status = IB_WC_WR_FLUSH_ERR;
 668                         goto err;
 669                 } else {
 670                         goto exit;
 671                 }
 672         }
 673
 674         if (unlikely(qp_state(qp) == IB_QPS_RESET)) {
 675                 qp->req.wqe_index = queue_get_consumer(q,
 676                                                 QUEUE_TYPE_FROM_CLIENT);
 677                 qp->req.opcode = -1;
 678                 qp->req.need_rd_atomic = 0;
 679                 qp->req.wait_psn = 0;
 680                 qp->req.need_retry = 0;
 681                 qp->req.wait_for_rnr_timer = 0;
 682                 spin_unlock_irqrestore(&qp->state_lock, flags);
 683                 goto exit;
 684         }
 685         spin_unlock_irqrestore(&qp->state_lock, flags);
 686
 687         /* we come here if the retransmit timer has fired
 688          * or if the rnr timer has fired. If the retransmit
 689          * timer fires while we are processing an RNR NAK wait
 690          * until the rnr timer has fired before starting the
 691          * retry flow
 692          */
 693         if (unlikely(qp->req.need_retry && !qp->req.wait_for_rnr_timer)) {
 694                 req_retry(qp);
 695                 qp->req.need_retry = 0;
 696         }
 697
 698         wqe = req_next_wqe(qp);
 699         if (unlikely(!wqe))
 700                 goto exit;
 701
 702         if (rxe_wqe_is_fenced(qp, wqe)) {
 703                 qp->req.wait_fence = 1;
 704                 goto exit;
 705         }
 706
 707         if (wqe->mask & WR_LOCAL_OP_MASK) {
 708                 err = rxe_do_local_ops(qp, wqe);
 709                 if (unlikely(err))
 710                         goto err;
 711                 else
 712                         goto done;
 713         }
 714
 715         if (unlikely(qp_type(qp) == IB_QPT_RC &&
 716                 psn_compare(qp->req.psn, (qp->comp.psn +
 717                                 RXE_MAX_UNACKED_PSNS)) > 0)) {
 718                 qp->req.wait_psn = 1;
 719                 goto exit;
 720         }
 721
 722         /* Limit the number of inflight SKBs per QP */
 723         if (unlikely(atomic_read(&qp->skb_out) >
 724                      RXE_INFLIGHT_SKBS_PER_QP_HIGH)) {
 725                 qp->need_req_skb = 1;
 726                 goto exit;
 727         }
 728
 729         opcode = next_opcode(qp, wqe, wqe->wr.opcode);
 730         if (unlikely(opcode < 0)) {
 731                 wqe->status = IB_WC_LOC_QP_OP_ERR;
 732                 goto err;
 733         }
 734
 735         mask = rxe_opcode[opcode].mask;
 736         if (unlikely(mask & (RXE_READ_OR_ATOMIC_MASK |
 737                         RXE_ATOMIC_WRITE_MASK))) {
 738                 if (check_init_depth(qp, wqe))
 739                         goto exit;
 740         }
 741
 742         mtu = get_mtu(qp);
 743         payload = (mask & (RXE_WRITE_OR_SEND_MASK | RXE_ATOMIC_WRITE_MASK)) ?
 744                         wqe->dma.resid : 0;
 745         if (payload > mtu) {
 746                 if (qp_type(qp) == IB_QPT_UD) {
 747                         /* C10-93.1.1: If the total sum of all the buffer lengths specified for a
 748                          * UD message exceeds the MTU of the port as returned by QueryHCA, the CI
 749                          * shall not emit any packets for this message. Further, the CI shall not
 750                          * generate an error due to this condition.
 751                          */
 752
 753                         /* fake a successful UD send */
 754                         wqe->first_psn = qp->req.psn;
 755                         wqe->last_psn = qp->req.psn;
 756                         qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
 757                         qp->req.opcode = IB_OPCODE_UD_SEND_ONLY;
 758                         qp->req.wqe_index = queue_next_index(qp->sq.queue,
 759                                                        qp->req.wqe_index);
 760                         wqe->state = wqe_state_done;
 761                         wqe->status = IB_WC_SUCCESS;
 762                         goto done;
 763                 }
 764                 payload = mtu;
 765         }
 766
 767         pkt.rxe = rxe;
 768         pkt.opcode = opcode;
 769         pkt.qp = qp;
 770         pkt.psn = qp->req.psn;
 771         pkt.mask = rxe_opcode[opcode].mask;
 772         pkt.wqe = wqe;
 773
 774         av = rxe_get_av(&pkt, &ah);
 775         if (unlikely(!av)) {
 776                 rxe_dbg_qp(qp, "Failed no address vector\n");
 777                 wqe->status = IB_WC_LOC_QP_OP_ERR;
 778                 goto err;
 779         }
 780
 781         skb = init_req_packet(qp, av, wqe, opcode, payload, &pkt);
 782         if (unlikely(!skb)) {
 783                 rxe_dbg_qp(qp, "Failed allocating skb\n");
 784                 wqe->status = IB_WC_LOC_QP_OP_ERR;
 785                 if (ah)
 786                         rxe_put(ah);
 787                 goto err;
 788         }
 789
 790         err = finish_packet(qp, av, wqe, &pkt, skb, payload);
 791         if (unlikely(err)) {
 792                 rxe_dbg_qp(qp, "Error during finish packet\n");
 793                 if (err == -EFAULT)
 794                         wqe->status = IB_WC_LOC_PROT_ERR;
 795                 else
 796                         wqe->status = IB_WC_LOC_QP_OP_ERR;
 797                 kfree_skb(skb);
 798                 if (ah)
 799                         rxe_put(ah);
 800                 goto err;
 801         }
 802
 803         if (ah)
 804                 rxe_put(ah);
 805
 806         err = rxe_xmit_packet(qp, &pkt, skb);
 807         if (err) {
 808                 wqe->status = IB_WC_LOC_QP_OP_ERR;
 809                 goto err;
 810         }
 811
 812         update_wqe_state(qp, wqe, &pkt);
 813         update_wqe_psn(qp, wqe, &pkt, payload);
 814         update_state(qp, &pkt);
 815
 816         /* A non-zero return value will cause rxe_do_task to
 817          * exit its loop and end the work item. A zero return
 818          * will continue looping and return to rxe_requester
 819          */
 820 done:
 821         ret = 0;
 822         goto out;
 823 err:
 824         /* update wqe_index for each wqe completion */
 825         qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
 826         wqe->state = wqe_state_error;
 827         rxe_qp_error(qp);
 828 exit:
 829         ret = -EAGAIN;
 830 out:
 831         return ret;
 832 }
 833
 834 int rxe_sender(struct rxe_qp *qp)
 835 {
 836         int req_ret;
 837         int comp_ret;
 838
 839         /* process the send queue */
 840         req_ret = rxe_requester(qp);
 841
 842         /* process the response queue */
 843         comp_ret = rxe_completer(qp);
 844
 845         /* exit the task loop if both requester and completer
 846          * are ready
 847          */
 848         return (req_ret && comp_ret) ? -EAGAIN : 0;
 849 }