drivers/infiniband/hw/hfi1/driver.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright(c) 2015-2020 Intel Corporation.
   4  * Copyright(c) 2021 Cornelis Networks.
   5  */
   6
   7 #include <linux/spinlock.h>
   8 #include <linux/pci.h>
   9 #include <linux/io.h>
  10 #include <linux/delay.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/vmalloc.h>
  13 #include <linux/module.h>
  14 #include <linux/prefetch.h>
  15 #include <rdma/ib_verbs.h>
  16 #include <linux/etherdevice.h>
  17
  18 #include "hfi.h"
  19 #include "trace.h"
  20 #include "qp.h"
  21 #include "sdma.h"
  22 #include "debugfs.h"
  23 #include "vnic.h"
  24 #include "fault.h"
  25
  26 #include "ipoib.h"
  27 #include "netdev.h"
  28
  29 #undef pr_fmt
  30 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  31
  32 DEFINE_MUTEX(hfi1_mutex);       /* general driver use */
  33
  34 unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
  35 module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
  36 MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
  37                  HFI1_DEFAULT_MAX_MTU));
  38
  39 unsigned int hfi1_cu = 1;
  40 module_param_named(cu, hfi1_cu, uint, S_IRUGO);
  41 MODULE_PARM_DESC(cu, "Credit return units");
  42
  43 unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
  44 static int hfi1_caps_set(const char *val, const struct kernel_param *kp);
  45 static int hfi1_caps_get(char *buffer, const struct kernel_param *kp);
  46 static const struct kernel_param_ops cap_ops = {
  47         .set = hfi1_caps_set,
  48         .get = hfi1_caps_get
  49 };
  50 module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
  51 MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
  52
  53 MODULE_LICENSE("Dual BSD/GPL");
  54 MODULE_DESCRIPTION("Cornelis Omni-Path Express driver");
  55
  56 /*
  57  * MAX_PKT_RCV is the max # if packets processed per receive interrupt.
  58  */
  59 #define MAX_PKT_RECV 64
  60 /*
  61  * MAX_PKT_THREAD_RCV is the max # of packets processed before
  62  * the qp_wait_list queue is flushed.
  63  */
  64 #define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4)
  65 #define EGR_HEAD_UPDATE_THRESHOLD 16
  66
  67 struct hfi1_ib_stats hfi1_stats;
  68
  69 static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
  70 {
  71         int ret = 0;
  72         unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
  73                 cap_mask = *cap_mask_ptr, value, diff,
  74                 write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
  75                               HFI1_CAP_WRITABLE_MASK);
  76
  77         ret = kstrtoul(val, 0, &value);
  78         if (ret) {
  79                 pr_warn("Invalid module parameter value for 'cap_mask'\n");
  80                 goto done;
  81         }
  82         /* Get the changed bits (except the locked bit) */
  83         diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
  84
  85         /* Remove any bits that are not allowed to change after driver load */
  86         if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
  87                 pr_warn("Ignoring non-writable capability bits %#lx\n",
  88                         diff & ~write_mask);
  89                 diff &= write_mask;
  90         }
  91
  92         /* Mask off any reserved bits */
  93         diff &= ~HFI1_CAP_RESERVED_MASK;
  94         /* Clear any previously set and changing bits */
  95         cap_mask &= ~diff;
  96         /* Update the bits with the new capability */
  97         cap_mask |= (value & diff);
  98         /* Check for any kernel/user restrictions */
  99         diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
 100                 ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
 101         cap_mask &= ~diff;
 102         /* Set the bitmask to the final set */
 103         *cap_mask_ptr = cap_mask;
 104 done:
 105         return ret;
 106 }
 107
 108 static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
 109 {
 110         unsigned long cap_mask = *(unsigned long *)kp->arg;
 111
 112         cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
 113         cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
 114
 115         return sysfs_emit(buffer, "0x%lx\n", cap_mask);
 116 }
 117
 118 struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
 119 {
 120         struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
 121         struct hfi1_devdata *dd = container_of(ibdev,
 122                                                struct hfi1_devdata, verbs_dev);
 123         return dd->pcidev;
 124 }
 125
 126 /*
 127  * Return count of units with at least one port ACTIVE.
 128  */
 129 int hfi1_count_active_units(void)
 130 {
 131         struct hfi1_devdata *dd;
 132         struct hfi1_pportdata *ppd;
 133         unsigned long index, flags;
 134         int pidx, nunits_active = 0;
 135
 136         xa_lock_irqsave(&hfi1_dev_table, flags);
 137         xa_for_each(&hfi1_dev_table, index, dd) {
 138                 if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1)
 139                         continue;
 140                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 141                         ppd = dd->pport + pidx;
 142                         if (ppd->lid && ppd->linkup) {
 143                                 nunits_active++;
 144                                 break;
 145                         }
 146                 }
 147         }
 148         xa_unlock_irqrestore(&hfi1_dev_table, flags);
 149         return nunits_active;
 150 }
 151
 152 /*
 153  * Get address of eager buffer from it's index (allocated in chunks, not
 154  * contiguous).
 155  */
 156 static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
 157                                u8 *update)
 158 {
 159         u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
 160
 161         *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
 162         return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
 163                         (offset * RCV_BUF_BLOCK_SIZE));
 164 }
 165
 166 static inline void *hfi1_get_header(struct hfi1_ctxtdata *rcd,
 167                                     __le32 *rhf_addr)
 168 {
 169         u32 offset = rhf_hdrq_offset(rhf_to_cpu(rhf_addr));
 170
 171         return (void *)(rhf_addr - rcd->rhf_offset + offset);
 172 }
 173
 174 static inline struct ib_header *hfi1_get_msgheader(struct hfi1_ctxtdata *rcd,
 175                                                    __le32 *rhf_addr)
 176 {
 177         return (struct ib_header *)hfi1_get_header(rcd, rhf_addr);
 178 }
 179
 180 static inline struct hfi1_16b_header
 181                 *hfi1_get_16B_header(struct hfi1_ctxtdata *rcd,
 182                                      __le32 *rhf_addr)
 183 {
 184         return (struct hfi1_16b_header *)hfi1_get_header(rcd, rhf_addr);
 185 }
 186
 187 /*
 188  * Validate and encode the a given RcvArray Buffer size.
 189  * The function will check whether the given size falls within
 190  * allowed size ranges for the respective type and, optionally,
 191  * return the proper encoding.
 192  */
 193 int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
 194 {
 195         if (unlikely(!PAGE_ALIGNED(size)))
 196                 return 0;
 197         if (unlikely(size < MIN_EAGER_BUFFER))
 198                 return 0;
 199         if (size >
 200             (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
 201                 return 0;
 202         if (encoded)
 203                 *encoded = ilog2(size / PAGE_SIZE) + 1;
 204         return 1;
 205 }
 206
 207 static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
 208                        struct hfi1_packet *packet)
 209 {
 210         struct ib_header *rhdr = packet->hdr;
 211         u32 rte = rhf_rcv_type_err(packet->rhf);
 212         u32 mlid_base;
 213         struct hfi1_ibport *ibp = rcd_to_iport(rcd);
 214         struct hfi1_devdata *dd = ppd->dd;
 215         struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;
 216         struct rvt_dev_info *rdi = &verbs_dev->rdi;
 217
 218         if ((packet->rhf & RHF_DC_ERR) &&
 219             hfi1_dbg_fault_suppress_err(verbs_dev))
 220                 return;
 221
 222         if (packet->rhf & RHF_ICRC_ERR)
 223                 return;
 224
 225         if (packet->etype == RHF_RCV_TYPE_BYPASS) {
 226                 goto drop;
 227         } else {
 228                 u8 lnh = ib_get_lnh(rhdr);
 229
 230                 mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE);
 231                 if (lnh == HFI1_LRH_BTH) {
 232                         packet->ohdr = &rhdr->u.oth;
 233                 } else if (lnh == HFI1_LRH_GRH) {
 234                         packet->ohdr = &rhdr->u.l.oth;
 235                         packet->grh = &rhdr->u.l.grh;
 236                 } else {
 237                         goto drop;
 238                 }
 239         }
 240
 241         if (packet->rhf & RHF_TID_ERR) {
 242                 /* For TIDERR and RC QPs preemptively schedule a NAK */
 243                 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 244                 u32 dlid = ib_get_dlid(rhdr);
 245                 u32 qp_num;
 246
 247                 /* Sanity check packet */
 248                 if (tlen < 24)
 249                         goto drop;
 250
 251                 /* Check for GRH */
 252                 if (packet->grh) {
 253                         u32 vtf;
 254                         struct ib_grh *grh = packet->grh;
 255
 256                         if (grh->next_hdr != IB_GRH_NEXT_HDR)
 257                                 goto drop;
 258                         vtf = be32_to_cpu(grh->version_tclass_flow);
 259                         if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
 260                                 goto drop;
 261                 }
 262
 263                 /* Get the destination QP number. */
 264                 qp_num = ib_bth_get_qpn(packet->ohdr);
 265                 if (dlid < mlid_base) {
 266                         struct rvt_qp *qp;
 267                         unsigned long flags;
 268
 269                         rcu_read_lock();
 270                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
 271                         if (!qp) {
 272                                 rcu_read_unlock();
 273                                 goto drop;
 274                         }
 275
 276                         /*
 277                          * Handle only RC QPs - for other QP types drop error
 278                          * packet.
 279                          */
 280                         spin_lock_irqsave(&qp->r_lock, flags);
 281
 282                         /* Check for valid receive state. */
 283                         if (!(ib_rvt_state_ops[qp->state] &
 284                               RVT_PROCESS_RECV_OK)) {
 285                                 ibp->rvp.n_pkt_drops++;
 286                         }
 287
 288                         switch (qp->ibqp.qp_type) {
 289                         case IB_QPT_RC:
 290                                 hfi1_rc_hdrerr(rcd, packet, qp);
 291                                 break;
 292                         default:
 293                                 /* For now don't handle any other QP types */
 294                                 break;
 295                         }
 296
 297                         spin_unlock_irqrestore(&qp->r_lock, flags);
 298                         rcu_read_unlock();
 299                 } /* Unicast QP */
 300         } /* Valid packet with TIDErr */
 301
 302         /* handle "RcvTypeErr" flags */
 303         switch (rte) {
 304         case RHF_RTE_ERROR_OP_CODE_ERR:
 305         {
 306                 void *ebuf = NULL;
 307                 u8 opcode;
 308
 309                 if (rhf_use_egr_bfr(packet->rhf))
 310                         ebuf = packet->ebuf;
 311
 312                 if (!ebuf)
 313                         goto drop; /* this should never happen */
 314
 315                 opcode = ib_bth_get_opcode(packet->ohdr);
 316                 if (opcode == IB_OPCODE_CNP) {
 317                         /*
 318                          * Only in pre-B0 h/w is the CNP_OPCODE handled
 319                          * via this code path.
 320                          */
 321                         struct rvt_qp *qp = NULL;
 322                         u32 lqpn, rqpn;
 323                         u16 rlid;
 324                         u8 svc_type, sl, sc5;
 325
 326                         sc5 = hfi1_9B_get_sc5(rhdr, packet->rhf);
 327                         sl = ibp->sc_to_sl[sc5];
 328
 329                         lqpn = ib_bth_get_qpn(packet->ohdr);
 330                         rcu_read_lock();
 331                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
 332                         if (!qp) {
 333                                 rcu_read_unlock();
 334                                 goto drop;
 335                         }
 336
 337                         switch (qp->ibqp.qp_type) {
 338                         case IB_QPT_UD:
 339                                 rlid = 0;
 340                                 rqpn = 0;
 341                                 svc_type = IB_CC_SVCTYPE_UD;
 342                                 break;
 343                         case IB_QPT_UC:
 344                                 rlid = ib_get_slid(rhdr);
 345                                 rqpn = qp->remote_qpn;
 346                                 svc_type = IB_CC_SVCTYPE_UC;
 347                                 break;
 348                         default:
 349                                 rcu_read_unlock();
 350                                 goto drop;
 351                         }
 352
 353                         process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 354                         rcu_read_unlock();
 355                 }
 356
 357                 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
 358                 break;
 359         }
 360         default:
 361                 break;
 362         }
 363
 364 drop:
 365         return;
 366 }
 367
 368 static inline void init_packet(struct hfi1_ctxtdata *rcd,
 369                                struct hfi1_packet *packet)
 370 {
 371         packet->rsize = get_hdrqentsize(rcd); /* words */
 372         packet->maxcnt = get_hdrq_cnt(rcd) * packet->rsize; /* words */
 373         packet->rcd = rcd;
 374         packet->updegr = 0;
 375         packet->etail = -1;
 376         packet->rhf_addr = get_rhf_addr(rcd);
 377         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 378         packet->rhqoff = hfi1_rcd_head(rcd);
 379         packet->numpkt = 0;
 380 }
 381
 382 /* We support only two types - 9B and 16B for now */
 383 static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = {
 384         [HFI1_PKT_TYPE_9B] = &return_cnp,
 385         [HFI1_PKT_TYPE_16B] = &return_cnp_16B
 386 };
 387
 388 /**
 389  * hfi1_process_ecn_slowpath - Process FECN or BECN bits
 390  * @qp: The packet's destination QP
 391  * @pkt: The packet itself.
 392  * @prescan: Is the caller the RXQ prescan
 393  *
 394  * Process the packet's FECN or BECN bits. By now, the packet
 395  * has already been evaluated whether processing of those bit should
 396  * be done.
 397  * The significance of the @prescan argument is that if the caller
 398  * is the RXQ prescan, a CNP will be send out instead of waiting for the
 399  * normal packet processing to send an ACK with BECN set (or a CNP).
 400  */
 401 bool hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
 402                                bool prescan)
 403 {
 404         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 405         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 406         struct ib_other_headers *ohdr = pkt->ohdr;
 407         struct ib_grh *grh = pkt->grh;
 408         u32 rqpn = 0;
 409         u16 pkey;
 410         u32 rlid, slid, dlid = 0;
 411         u8 hdr_type, sc, svc_type, opcode;
 412         bool is_mcast = false, ignore_fecn = false, do_cnp = false,
 413                 fecn, becn;
 414
 415         /* can be called from prescan */
 416         if (pkt->etype == RHF_RCV_TYPE_BYPASS) {
 417                 pkey = hfi1_16B_get_pkey(pkt->hdr);
 418                 sc = hfi1_16B_get_sc(pkt->hdr);
 419                 dlid = hfi1_16B_get_dlid(pkt->hdr);
 420                 slid = hfi1_16B_get_slid(pkt->hdr);
 421                 is_mcast = hfi1_is_16B_mcast(dlid);
 422                 opcode = ib_bth_get_opcode(ohdr);
 423                 hdr_type = HFI1_PKT_TYPE_16B;
 424                 fecn = hfi1_16B_get_fecn(pkt->hdr);
 425                 becn = hfi1_16B_get_becn(pkt->hdr);
 426         } else {
 427                 pkey = ib_bth_get_pkey(ohdr);
 428                 sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf);
 429                 dlid = qp->ibqp.qp_type != IB_QPT_UD ? ib_get_dlid(pkt->hdr) :
 430                         ppd->lid;
 431                 slid = ib_get_slid(pkt->hdr);
 432                 is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
 433                            (dlid != be16_to_cpu(IB_LID_PERMISSIVE));
 434                 opcode = ib_bth_get_opcode(ohdr);
 435                 hdr_type = HFI1_PKT_TYPE_9B;
 436                 fecn = ib_bth_get_fecn(ohdr);
 437                 becn = ib_bth_get_becn(ohdr);
 438         }
 439
 440         switch (qp->ibqp.qp_type) {
 441         case IB_QPT_UD:
 442                 rlid = slid;
 443                 rqpn = ib_get_sqpn(pkt->ohdr);
 444                 svc_type = IB_CC_SVCTYPE_UD;
 445                 break;
 446         case IB_QPT_SMI:
 447         case IB_QPT_GSI:
 448                 rlid = slid;
 449                 rqpn = ib_get_sqpn(pkt->ohdr);
 450                 svc_type = IB_CC_SVCTYPE_UD;
 451                 break;
 452         case IB_QPT_UC:
 453                 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
 454                 rqpn = qp->remote_qpn;
 455                 svc_type = IB_CC_SVCTYPE_UC;
 456                 break;
 457         case IB_QPT_RC:
 458                 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
 459                 rqpn = qp->remote_qpn;
 460                 svc_type = IB_CC_SVCTYPE_RC;
 461                 break;
 462         default:
 463                 return false;
 464         }
 465
 466         ignore_fecn = is_mcast || (opcode == IB_OPCODE_CNP) ||
 467                 (opcode == IB_OPCODE_RC_ACKNOWLEDGE);
 468         /*
 469          * ACKNOWLEDGE packets do not get a CNP but this will be
 470          * guarded by ignore_fecn above.
 471          */
 472         do_cnp = prescan ||
 473                 (opcode >= IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST &&
 474                  opcode <= IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE) ||
 475                 opcode == TID_OP(READ_RESP) ||
 476                 opcode == TID_OP(ACK);
 477
 478         /* Call appropriate CNP handler */
 479         if (!ignore_fecn && do_cnp && fecn)
 480                 hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,
 481                                               dlid, rlid, sc, grh);
 482
 483         if (becn) {
 484                 u32 lqpn = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;
 485                 u8 sl = ibp->sc_to_sl[sc];
 486
 487                 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 488         }
 489         return !ignore_fecn && fecn;
 490 }
 491
 492 struct ps_mdata {
 493         struct hfi1_ctxtdata *rcd;
 494         u32 rsize;
 495         u32 maxcnt;
 496         u32 ps_head;
 497         u32 ps_tail;
 498         u32 ps_seq;
 499 };
 500
 501 static inline void init_ps_mdata(struct ps_mdata *mdata,
 502                                  struct hfi1_packet *packet)
 503 {
 504         struct hfi1_ctxtdata *rcd = packet->rcd;
 505
 506         mdata->rcd = rcd;
 507         mdata->rsize = packet->rsize;
 508         mdata->maxcnt = packet->maxcnt;
 509         mdata->ps_head = packet->rhqoff;
 510
 511         if (get_dma_rtail_setting(rcd)) {
 512                 mdata->ps_tail = get_rcvhdrtail(rcd);
 513                 if (rcd->ctxt == HFI1_CTRL_CTXT)
 514                         mdata->ps_seq = hfi1_seq_cnt(rcd);
 515                 else
 516                         mdata->ps_seq = 0; /* not used with DMA_RTAIL */
 517         } else {
 518                 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
 519                 mdata->ps_seq = hfi1_seq_cnt(rcd);
 520         }
 521 }
 522
 523 static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
 524                           struct hfi1_ctxtdata *rcd)
 525 {
 526         if (get_dma_rtail_setting(rcd))
 527                 return mdata->ps_head == mdata->ps_tail;
 528         return mdata->ps_seq != rhf_rcv_seq(rhf);
 529 }
 530
 531 static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
 532                           struct hfi1_ctxtdata *rcd)
 533 {
 534         /*
 535          * Control context can potentially receive an invalid rhf.
 536          * Drop such packets.
 537          */
 538         if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
 539                 return mdata->ps_seq != rhf_rcv_seq(rhf);
 540
 541         return 0;
 542 }
 543
 544 static inline void update_ps_mdata(struct ps_mdata *mdata,
 545                                    struct hfi1_ctxtdata *rcd)
 546 {
 547         mdata->ps_head += mdata->rsize;
 548         if (mdata->ps_head >= mdata->maxcnt)
 549                 mdata->ps_head = 0;
 550
 551         /* Control context must do seq counting */
 552         if (!get_dma_rtail_setting(rcd) ||
 553             rcd->ctxt == HFI1_CTRL_CTXT)
 554                 mdata->ps_seq = hfi1_seq_incr_wrap(mdata->ps_seq);
 555 }
 556
 557 /*
 558  * prescan_rxq - search through the receive queue looking for packets
 559  * containing Excplicit Congestion Notifications (FECNs, or BECNs).
 560  * When an ECN is found, process the Congestion Notification, and toggle
 561  * it off.
 562  * This is declared as a macro to allow quick checking of the port to avoid
 563  * the overhead of a function call if not enabled.
 564  */
 565 #define prescan_rxq(rcd, packet) \
 566         do { \
 567                 if (rcd->ppd->cc_prescan) \
 568                         __prescan_rxq(packet); \
 569         } while (0)
 570 static void __prescan_rxq(struct hfi1_packet *packet)
 571 {
 572         struct hfi1_ctxtdata *rcd = packet->rcd;
 573         struct ps_mdata mdata;
 574
 575         init_ps_mdata(&mdata, packet);
 576
 577         while (1) {
 578                 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
 579                 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
 580                                          packet->rcd->rhf_offset;
 581                 struct rvt_qp *qp;
 582                 struct ib_header *hdr;
 583                 struct rvt_dev_info *rdi = &rcd->dd->verbs_dev.rdi;
 584                 u64 rhf = rhf_to_cpu(rhf_addr);
 585                 u32 etype = rhf_rcv_type(rhf), qpn, bth1;
 586                 u8 lnh;
 587
 588                 if (ps_done(&mdata, rhf, rcd))
 589                         break;
 590
 591                 if (ps_skip(&mdata, rhf, rcd))
 592                         goto next;
 593
 594                 if (etype != RHF_RCV_TYPE_IB)
 595                         goto next;
 596
 597                 packet->hdr = hfi1_get_msgheader(packet->rcd, rhf_addr);
 598                 hdr = packet->hdr;
 599                 lnh = ib_get_lnh(hdr);
 600
 601                 if (lnh == HFI1_LRH_BTH) {
 602                         packet->ohdr = &hdr->u.oth;
 603                         packet->grh = NULL;
 604                 } else if (lnh == HFI1_LRH_GRH) {
 605                         packet->ohdr = &hdr->u.l.oth;
 606                         packet->grh = &hdr->u.l.grh;
 607                 } else {
 608                         goto next; /* just in case */
 609                 }
 610
 611                 if (!hfi1_may_ecn(packet))
 612                         goto next;
 613
 614                 bth1 = be32_to_cpu(packet->ohdr->bth[1]);
 615                 qpn = bth1 & RVT_QPN_MASK;
 616                 rcu_read_lock();
 617                 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
 618
 619                 if (!qp) {
 620                         rcu_read_unlock();
 621                         goto next;
 622                 }
 623
 624                 hfi1_process_ecn_slowpath(qp, packet, true);
 625                 rcu_read_unlock();
 626
 627                 /* turn off BECN, FECN */
 628                 bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK);
 629                 packet->ohdr->bth[1] = cpu_to_be32(bth1);
 630 next:
 631                 update_ps_mdata(&mdata, rcd);
 632         }
 633 }
 634
 635 static void process_rcv_qp_work(struct hfi1_packet *packet)
 636 {
 637         struct rvt_qp *qp, *nqp;
 638         struct hfi1_ctxtdata *rcd = packet->rcd;
 639
 640         /*
 641          * Iterate over all QPs waiting to respond.
 642          * The list won't change since the IRQ is only run on one CPU.
 643          */
 644         list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
 645                 list_del_init(&qp->rspwait);
 646                 if (qp->r_flags & RVT_R_RSP_NAK) {
 647                         qp->r_flags &= ~RVT_R_RSP_NAK;
 648                         packet->qp = qp;
 649                         hfi1_send_rc_ack(packet, 0);
 650                 }
 651                 if (qp->r_flags & RVT_R_RSP_SEND) {
 652                         unsigned long flags;
 653
 654                         qp->r_flags &= ~RVT_R_RSP_SEND;
 655                         spin_lock_irqsave(&qp->s_lock, flags);
 656                         if (ib_rvt_state_ops[qp->state] &
 657                                         RVT_PROCESS_OR_FLUSH_SEND)
 658                                 hfi1_schedule_send(qp);
 659                         spin_unlock_irqrestore(&qp->s_lock, flags);
 660                 }
 661                 rvt_put_qp(qp);
 662         }
 663 }
 664
 665 static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread)
 666 {
 667         if (thread) {
 668                 if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0)
 669                         /* allow defered processing */
 670                         process_rcv_qp_work(packet);
 671                 cond_resched();
 672                 return RCV_PKT_OK;
 673         } else {
 674                 this_cpu_inc(*packet->rcd->dd->rcv_limit);
 675                 return RCV_PKT_LIMIT;
 676         }
 677 }
 678
 679 static inline int check_max_packet(struct hfi1_packet *packet, int thread)
 680 {
 681         int ret = RCV_PKT_OK;
 682
 683         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0))
 684                 ret = max_packet_exceeded(packet, thread);
 685         return ret;
 686 }
 687
 688 static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
 689 {
 690         int ret;
 691
 692         packet->rcd->dd->ctx0_seq_drop++;
 693         /* Set up for the next packet */
 694         packet->rhqoff += packet->rsize;
 695         if (packet->rhqoff >= packet->maxcnt)
 696                 packet->rhqoff = 0;
 697
 698         packet->numpkt++;
 699         ret = check_max_packet(packet, thread);
 700
 701         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 702                                      packet->rcd->rhf_offset;
 703         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 704
 705         return ret;
 706 }
 707
 708 static void process_rcv_packet_napi(struct hfi1_packet *packet)
 709 {
 710         packet->etype = rhf_rcv_type(packet->rhf);
 711
 712         /* total length */
 713         packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 714         /* retrieve eager buffer details */
 715         packet->etail = rhf_egr_index(packet->rhf);
 716         packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
 717                                   &packet->updegr);
 718         /*
 719          * Prefetch the contents of the eager buffer.  It is
 720          * OK to send a negative length to prefetch_range().
 721          * The +2 is the size of the RHF.
 722          */
 723         prefetch_range(packet->ebuf,
 724                        packet->tlen - ((packet->rcd->rcvhdrqentsize -
 725                                        (rhf_hdrq_offset(packet->rhf)
 726                                         + 2)) * 4));
 727
 728         packet->rcd->rhf_rcv_function_map[packet->etype](packet);
 729         packet->numpkt++;
 730
 731         /* Set up for the next packet */
 732         packet->rhqoff += packet->rsize;
 733         if (packet->rhqoff >= packet->maxcnt)
 734                 packet->rhqoff = 0;
 735
 736         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 737                                       packet->rcd->rhf_offset;
 738         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 739 }
 740
 741 static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
 742 {
 743         int ret;
 744
 745         packet->etype = rhf_rcv_type(packet->rhf);
 746
 747         /* total length */
 748         packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 749         /* retrieve eager buffer details */
 750         packet->ebuf = NULL;
 751         if (rhf_use_egr_bfr(packet->rhf)) {
 752                 packet->etail = rhf_egr_index(packet->rhf);
 753                 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
 754                                  &packet->updegr);
 755                 /*
 756                  * Prefetch the contents of the eager buffer.  It is
 757                  * OK to send a negative length to prefetch_range().
 758                  * The +2 is the size of the RHF.
 759                  */
 760                 prefetch_range(packet->ebuf,
 761                                packet->tlen - ((get_hdrqentsize(packet->rcd) -
 762                                                (rhf_hdrq_offset(packet->rhf)
 763                                                 + 2)) * 4));
 764         }
 765
 766         /*
 767          * Call a type specific handler for the packet. We
 768          * should be able to trust that etype won't be beyond
 769          * the range of valid indexes. If so something is really
 770          * wrong and we can probably just let things come
 771          * crashing down. There is no need to eat another
 772          * comparison in this performance critical code.
 773          */
 774         packet->rcd->rhf_rcv_function_map[packet->etype](packet);
 775         packet->numpkt++;
 776
 777         /* Set up for the next packet */
 778         packet->rhqoff += packet->rsize;
 779         if (packet->rhqoff >= packet->maxcnt)
 780                 packet->rhqoff = 0;
 781
 782         ret = check_max_packet(packet, thread);
 783
 784         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 785                                       packet->rcd->rhf_offset;
 786         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 787
 788         return ret;
 789 }
 790
 791 static inline void process_rcv_update(int last, struct hfi1_packet *packet)
 792 {
 793         /*
 794          * Update head regs etc., every 16 packets, if not last pkt,
 795          * to help prevent rcvhdrq overflows, when many packets
 796          * are processed and queue is nearly full.
 797          * Don't request an interrupt for intermediate updates.
 798          */
 799         if (!last && !(packet->numpkt & 0xf)) {
 800                 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
 801                                packet->etail, 0, 0);
 802                 packet->updegr = 0;
 803         }
 804         packet->grh = NULL;
 805 }
 806
 807 static inline void finish_packet(struct hfi1_packet *packet)
 808 {
 809         /*
 810          * Nothing we need to free for the packet.
 811          *
 812          * The only thing we need to do is a final update and call for an
 813          * interrupt
 814          */
 815         update_usrhead(packet->rcd, hfi1_rcd_head(packet->rcd), packet->updegr,
 816                        packet->etail, rcv_intr_dynamic, packet->numpkt);
 817 }
 818
 819 /*
 820  * handle_receive_interrupt_napi_fp - receive a packet
 821  * @rcd: the context
 822  * @budget: polling budget
 823  *
 824  * Called from interrupt handler for receive interrupt.
 825  * This is the fast path interrupt handler
 826  * when executing napi soft irq environment.
 827  */
 828 int handle_receive_interrupt_napi_fp(struct hfi1_ctxtdata *rcd, int budget)
 829 {
 830         struct hfi1_packet packet;
 831
 832         init_packet(rcd, &packet);
 833         if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
 834                 goto bail;
 835
 836         while (packet.numpkt < budget) {
 837                 process_rcv_packet_napi(&packet);
 838                 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
 839                         break;
 840
 841                 process_rcv_update(0, &packet);
 842         }
 843         hfi1_set_rcd_head(rcd, packet.rhqoff);
 844 bail:
 845         finish_packet(&packet);
 846         return packet.numpkt;
 847 }
 848
 849 /*
 850  * Handle receive interrupts when using the no dma rtail option.
 851  */
 852 int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 853 {
 854         int last = RCV_PKT_OK;
 855         struct hfi1_packet packet;
 856
 857         init_packet(rcd, &packet);
 858         if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {
 859                 last = RCV_PKT_DONE;
 860                 goto bail;
 861         }
 862
 863         prescan_rxq(rcd, &packet);
 864
 865         while (last == RCV_PKT_OK) {
 866                 last = process_rcv_packet(&packet, thread);
 867                 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
 868                         last = RCV_PKT_DONE;
 869                 process_rcv_update(last, &packet);
 870         }
 871         process_rcv_qp_work(&packet);
 872         hfi1_set_rcd_head(rcd, packet.rhqoff);
 873 bail:
 874         finish_packet(&packet);
 875         return last;
 876 }
 877
 878 int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 879 {
 880         u32 hdrqtail;
 881         int last = RCV_PKT_OK;
 882         struct hfi1_packet packet;
 883
 884         init_packet(rcd, &packet);
 885         hdrqtail = get_rcvhdrtail(rcd);
 886         if (packet.rhqoff == hdrqtail) {
 887                 last = RCV_PKT_DONE;
 888                 goto bail;
 889         }
 890         smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 891
 892         prescan_rxq(rcd, &packet);
 893
 894         while (last == RCV_PKT_OK) {
 895                 last = process_rcv_packet(&packet, thread);
 896                 if (packet.rhqoff == hdrqtail)
 897                         last = RCV_PKT_DONE;
 898                 process_rcv_update(last, &packet);
 899         }
 900         process_rcv_qp_work(&packet);
 901         hfi1_set_rcd_head(rcd, packet.rhqoff);
 902 bail:
 903         finish_packet(&packet);
 904         return last;
 905 }
 906
 907 static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
 908 {
 909         u16 i;
 910
 911         /*
 912          * For dynamically allocated kernel contexts (like vnic) switch
 913          * interrupt handler only for that context. Otherwise, switch
 914          * interrupt handler for all statically allocated kernel contexts.
 915          */
 916         if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) {
 917                 hfi1_rcd_get(rcd);
 918                 hfi1_set_fast(rcd);
 919                 hfi1_rcd_put(rcd);
 920                 return;
 921         }
 922
 923         for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
 924                 rcd = hfi1_rcd_get_by_index(dd, i);
 925                 if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic))
 926                         hfi1_set_fast(rcd);
 927                 hfi1_rcd_put(rcd);
 928         }
 929 }
 930
 931 void set_all_slowpath(struct hfi1_devdata *dd)
 932 {
 933         struct hfi1_ctxtdata *rcd;
 934         u16 i;
 935
 936         /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
 937         for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
 938                 rcd = hfi1_rcd_get_by_index(dd, i);
 939                 if (!rcd)
 940                         continue;
 941                 if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
 942                         rcd->do_interrupt = rcd->slow_handler;
 943
 944                 hfi1_rcd_put(rcd);
 945         }
 946 }
 947
 948 static bool __set_armed_to_active(struct hfi1_packet *packet)
 949 {
 950         u8 etype = rhf_rcv_type(packet->rhf);
 951         u8 sc = SC15_PACKET;
 952
 953         if (etype == RHF_RCV_TYPE_IB) {
 954                 struct ib_header *hdr = hfi1_get_msgheader(packet->rcd,
 955                                                            packet->rhf_addr);
 956                 sc = hfi1_9B_get_sc5(hdr, packet->rhf);
 957         } else if (etype == RHF_RCV_TYPE_BYPASS) {
 958                 struct hfi1_16b_header *hdr = hfi1_get_16B_header(
 959                                                 packet->rcd,
 960                                                 packet->rhf_addr);
 961                 sc = hfi1_16B_get_sc(hdr);
 962         }
 963         if (sc != SC15_PACKET) {
 964                 int hwstate = driver_lstate(packet->rcd->ppd);
 965                 struct work_struct *lsaw =
 966                                 &packet->rcd->ppd->linkstate_active_work;
 967
 968                 if (hwstate != IB_PORT_ACTIVE) {
 969                         dd_dev_info(packet->rcd->dd,
 970                                     "Unexpected link state %s\n",
 971                                     opa_lstate_name(hwstate));
 972                         return false;
 973                 }
 974
 975                 queue_work(packet->rcd->ppd->link_wq, lsaw);
 976                 return true;
 977         }
 978         return false;
 979 }
 980
 981 /**
 982  * set_armed_to_active  - the fast path for armed to active
 983  * @packet: the packet structure
 984  *
 985  * Return true if packet processing needs to bail.
 986  */
 987 static bool set_armed_to_active(struct hfi1_packet *packet)
 988 {
 989         if (likely(packet->rcd->ppd->host_link_state != HLS_UP_ARMED))
 990                 return false;
 991         return __set_armed_to_active(packet);
 992 }
 993
 994 /*
 995  * handle_receive_interrupt - receive a packet
 996  * @rcd: the context
 997  *
 998  * Called from interrupt handler for errors or receive interrupt.
 999  * This is the slow path interrupt handler.
1000  */
1001 int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
1002 {
1003         struct hfi1_devdata *dd = rcd->dd;
1004         u32 hdrqtail;
1005         int needset, last = RCV_PKT_OK;
1006         struct hfi1_packet packet;
1007         int skip_pkt = 0;
1008
1009         if (!rcd->rcvhdrq)
1010                 return RCV_PKT_OK;
1011         /* Control context will always use the slow path interrupt handler */
1012         needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
1013
1014         init_packet(rcd, &packet);
1015
1016         if (!get_dma_rtail_setting(rcd)) {
1017                 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {
1018                         last = RCV_PKT_DONE;
1019                         goto bail;
1020                 }
1021                 hdrqtail = 0;
1022         } else {
1023                 hdrqtail = get_rcvhdrtail(rcd);
1024                 if (packet.rhqoff == hdrqtail) {
1025                         last = RCV_PKT_DONE;
1026                         goto bail;
1027                 }
1028                 smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
1029
1030                 /*
1031                  * Control context can potentially receive an invalid
1032                  * rhf. Drop such packets.
1033                  */
1034                 if (rcd->ctxt == HFI1_CTRL_CTXT)
1035                         if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
1036                                 skip_pkt = 1;
1037         }
1038
1039         prescan_rxq(rcd, &packet);
1040
1041         while (last == RCV_PKT_OK) {
1042                 if (hfi1_need_drop(dd)) {
1043                         /* On to the next packet */
1044                         packet.rhqoff += packet.rsize;
1045                         packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1046                                           packet.rhqoff +
1047                                           rcd->rhf_offset;
1048                         packet.rhf = rhf_to_cpu(packet.rhf_addr);
1049
1050                 } else if (skip_pkt) {
1051                         last = skip_rcv_packet(&packet, thread);
1052                         skip_pkt = 0;
1053                 } else {
1054                         if (set_armed_to_active(&packet))
1055                                 goto bail;
1056                         last = process_rcv_packet(&packet, thread);
1057                 }
1058
1059                 if (!get_dma_rtail_setting(rcd)) {
1060                         if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
1061                                 last = RCV_PKT_DONE;
1062                 } else {
1063                         if (packet.rhqoff == hdrqtail)
1064                                 last = RCV_PKT_DONE;
1065                         /*
1066                          * Control context can potentially receive an invalid
1067                          * rhf. Drop such packets.
1068                          */
1069                         if (rcd->ctxt == HFI1_CTRL_CTXT) {
1070                                 bool lseq;
1071
1072                                 lseq = hfi1_seq_incr(rcd,
1073                                                      rhf_rcv_seq(packet.rhf));
1074                                 if (!last && lseq)
1075                                         skip_pkt = 1;
1076                         }
1077                 }
1078
1079                 if (needset) {
1080                         needset = false;
1081                         set_all_fastpath(dd, rcd);
1082                 }
1083                 process_rcv_update(last, &packet);
1084         }
1085
1086         process_rcv_qp_work(&packet);
1087         hfi1_set_rcd_head(rcd, packet.rhqoff);
1088
1089 bail:
1090         /*
1091          * Always write head at end, and setup rcv interrupt, even
1092          * if no packets were processed.
1093          */
1094         finish_packet(&packet);
1095         return last;
1096 }
1097
1098 /*
1099  * handle_receive_interrupt_napi_sp - receive a packet
1100  * @rcd: the context
1101  * @budget: polling budget
1102  *
1103  * Called from interrupt handler for errors or receive interrupt.
1104  * This is the slow path interrupt handler
1105  * when executing napi soft irq environment.
1106  */
1107 int handle_receive_interrupt_napi_sp(struct hfi1_ctxtdata *rcd, int budget)
1108 {
1109         struct hfi1_devdata *dd = rcd->dd;
1110         int last = RCV_PKT_OK;
1111         bool needset = true;
1112         struct hfi1_packet packet;
1113
1114         init_packet(rcd, &packet);
1115         if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
1116                 goto bail;
1117
1118         while (last != RCV_PKT_DONE && packet.numpkt < budget) {
1119                 if (hfi1_need_drop(dd)) {
1120                         /* On to the next packet */
1121                         packet.rhqoff += packet.rsize;
1122                         packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1123                                           packet.rhqoff +
1124                                           rcd->rhf_offset;
1125                         packet.rhf = rhf_to_cpu(packet.rhf_addr);
1126
1127                 } else {
1128                         if (set_armed_to_active(&packet))
1129                                 goto bail;
1130                         process_rcv_packet_napi(&packet);
1131                 }
1132
1133                 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
1134                         last = RCV_PKT_DONE;
1135
1136                 if (needset) {
1137                         needset = false;
1138                         set_all_fastpath(dd, rcd);
1139                 }
1140
1141                 process_rcv_update(last, &packet);
1142         }
1143
1144         hfi1_set_rcd_head(rcd, packet.rhqoff);
1145
1146 bail:
1147         /*
1148          * Always write head at end, and setup rcv interrupt, even
1149          * if no packets were processed.
1150          */
1151         finish_packet(&packet);
1152         return packet.numpkt;
1153 }
1154
1155 /*
1156  * We may discover in the interrupt that the hardware link state has
1157  * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1158  * and we need to update the driver's notion of the link state.  We cannot
1159  * run set_link_state from interrupt context, so we queue this function on
1160  * a workqueue.
1161  *
1162  * We delay the regular interrupt processing until after the state changes
1163  * so that the link will be in the correct state by the time any application
1164  * we wake up attempts to send a reply to any message it received.
1165  * (Subsequent receive interrupts may possibly force the wakeup before we
1166  * update the link state.)
1167  *
1168  * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1169  * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1170  * so we're safe from use-after-free of the rcd.
1171  */
1172 void receive_interrupt_work(struct work_struct *work)
1173 {
1174         struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1175                                                   linkstate_active_work);
1176         struct hfi1_devdata *dd = ppd->dd;
1177         struct hfi1_ctxtdata *rcd;
1178         u16 i;
1179
1180         /* Received non-SC15 packet implies neighbor_normal */
1181         ppd->neighbor_normal = 1;
1182         set_link_state(ppd, HLS_UP_ACTIVE);
1183
1184         /*
1185          * Interrupt all statically allocated kernel contexts that could
1186          * have had an interrupt during auto activation.
1187          */
1188         for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) {
1189                 rcd = hfi1_rcd_get_by_index(dd, i);
1190                 if (rcd)
1191                         force_recv_intr(rcd);
1192                 hfi1_rcd_put(rcd);
1193         }
1194 }
1195
1196 /*
1197  * Convert a given MTU size to the on-wire MAD packet enumeration.
1198  * Return -1 if the size is invalid.
1199  */
1200 int mtu_to_enum(u32 mtu, int default_if_bad)
1201 {
1202         switch (mtu) {
1203         case     0: return OPA_MTU_0;
1204         case   256: return OPA_MTU_256;
1205         case   512: return OPA_MTU_512;
1206         case  1024: return OPA_MTU_1024;
1207         case  2048: return OPA_MTU_2048;
1208         case  4096: return OPA_MTU_4096;
1209         case  8192: return OPA_MTU_8192;
1210         case 10240: return OPA_MTU_10240;
1211         }
1212         return default_if_bad;
1213 }
1214
1215 u16 enum_to_mtu(int mtu)
1216 {
1217         switch (mtu) {
1218         case OPA_MTU_0:     return 0;
1219         case OPA_MTU_256:   return 256;
1220         case OPA_MTU_512:   return 512;
1221         case OPA_MTU_1024:  return 1024;
1222         case OPA_MTU_2048:  return 2048;
1223         case OPA_MTU_4096:  return 4096;
1224         case OPA_MTU_8192:  return 8192;
1225         case OPA_MTU_10240: return 10240;
1226         default: return 0xffff;
1227         }
1228 }
1229
1230 /*
1231  * set_mtu - set the MTU
1232  * @ppd: the per port data
1233  *
1234  * We can handle "any" incoming size, the issue here is whether we
1235  * need to restrict our outgoing size.  We do not deal with what happens
1236  * to programs that are already running when the size changes.
1237  */
1238 int set_mtu(struct hfi1_pportdata *ppd)
1239 {
1240         struct hfi1_devdata *dd = ppd->dd;
1241         int i, drain, ret = 0, is_up = 0;
1242
1243         ppd->ibmtu = 0;
1244         for (i = 0; i < ppd->vls_supported; i++)
1245                 if (ppd->ibmtu < dd->vld[i].mtu)
1246                         ppd->ibmtu = dd->vld[i].mtu;
1247         ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
1248
1249         mutex_lock(&ppd->hls_lock);
1250         if (ppd->host_link_state == HLS_UP_INIT ||
1251             ppd->host_link_state == HLS_UP_ARMED ||
1252             ppd->host_link_state == HLS_UP_ACTIVE)
1253                 is_up = 1;
1254
1255         drain = !is_ax(dd) && is_up;
1256
1257         if (drain)
1258                 /*
1259                  * MTU is specified per-VL. To ensure that no packet gets
1260                  * stuck (due, e.g., to the MTU for the packet's VL being
1261                  * reduced), empty the per-VL FIFOs before adjusting MTU.
1262                  */
1263                 ret = stop_drain_data_vls(dd);
1264
1265         if (ret) {
1266                 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1267                            __func__);
1268                 goto err;
1269         }
1270
1271         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
1272
1273         if (drain)
1274                 open_fill_data_vls(dd); /* reopen all VLs */
1275
1276 err:
1277         mutex_unlock(&ppd->hls_lock);
1278
1279         return ret;
1280 }
1281
1282 int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1283 {
1284         struct hfi1_devdata *dd = ppd->dd;
1285
1286         ppd->lid = lid;
1287         ppd->lmc = lmc;
1288         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
1289
1290         dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);
1291
1292         return 0;
1293 }
1294
1295 void shutdown_led_override(struct hfi1_pportdata *ppd)
1296 {
1297         struct hfi1_devdata *dd = ppd->dd;
1298
1299         /*
1300          * This pairs with the memory barrier in hfi1_start_led_override to
1301          * ensure that we read the correct state of LED beaconing represented
1302          * by led_override_timer_active
1303          */
1304         smp_rmb();
1305         if (atomic_read(&ppd->led_override_timer_active)) {
1306                 del_timer_sync(&ppd->led_override_timer);
1307                 atomic_set(&ppd->led_override_timer_active, 0);
1308                 /* Ensure the atomic_set is visible to all CPUs */
1309                 smp_wmb();
1310         }
1311
1312         /* Hand control of the LED to the DC for normal operation */
1313         write_csr(dd, DCC_CFG_LED_CNTRL, 0);
1314 }
1315
1316 static void run_led_override(struct timer_list *t)
1317 {
1318         struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer);
1319         struct hfi1_devdata *dd = ppd->dd;
1320         unsigned long timeout;
1321         int phase_idx;
1322
1323         if (!(dd->flags & HFI1_INITTED))
1324                 return;
1325
1326         phase_idx = ppd->led_override_phase & 1;
1327
1328         setextled(dd, phase_idx);
1329
1330         timeout = ppd->led_override_vals[phase_idx];
1331
1332         /* Set up for next phase */
1333         ppd->led_override_phase = !ppd->led_override_phase;
1334
1335         mod_timer(&ppd->led_override_timer, jiffies + timeout);
1336 }
1337
1338 /*
1339  * To have the LED blink in a particular pattern, provide timeon and timeoff
1340  * in milliseconds.
1341  * To turn off custom blinking and return to normal operation, use
1342  * shutdown_led_override()
1343  */
1344 void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1345                              unsigned int timeoff)
1346 {
1347         if (!(ppd->dd->flags & HFI1_INITTED))
1348                 return;
1349
1350         /* Convert to jiffies for direct use in timer */
1351         ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
1352         ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
1353
1354         /* Arbitrarily start from LED on phase */
1355         ppd->led_override_phase = 1;
1356
1357         /*
1358          * If the timer has not already been started, do so. Use a "quick"
1359          * timeout so the handler will be called soon to look at our request.
1360          */
1361         if (!timer_pending(&ppd->led_override_timer)) {
1362                 timer_setup(&ppd->led_override_timer, run_led_override, 0);
1363                 ppd->led_override_timer.expires = jiffies + 1;
1364                 add_timer(&ppd->led_override_timer);
1365                 atomic_set(&ppd->led_override_timer_active, 1);
1366                 /* Ensure the atomic_set is visible to all CPUs */
1367                 smp_wmb();
1368         }
1369 }
1370
1371 /**
1372  * hfi1_reset_device - reset the chip if possible
1373  * @unit: the device to reset
1374  *
1375  * Whether or not reset is successful, we attempt to re-initialize the chip
1376  * (that is, much like a driver unload/reload).  We clear the INITTED flag
1377  * so that the various entry points will fail until we reinitialize.  For
1378  * now, we only allow this if no user contexts are open that use chip resources
1379  */
1380 int hfi1_reset_device(int unit)
1381 {
1382         int ret;
1383         struct hfi1_devdata *dd = hfi1_lookup(unit);
1384         struct hfi1_pportdata *ppd;
1385         int pidx;
1386
1387         if (!dd) {
1388                 ret = -ENODEV;
1389                 goto bail;
1390         }
1391
1392         dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1393
1394         if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) {
1395                 dd_dev_info(dd,
1396                             "Invalid unit number %u or not initialized or not present\n",
1397                             unit);
1398                 ret = -ENXIO;
1399                 goto bail;
1400         }
1401
1402         /* If there are any user/vnic contexts, we cannot reset */
1403         mutex_lock(&hfi1_mutex);
1404         if (dd->rcd)
1405                 if (hfi1_stats.sps_ctxts) {
1406                         mutex_unlock(&hfi1_mutex);
1407                         ret = -EBUSY;
1408                         goto bail;
1409                 }
1410         mutex_unlock(&hfi1_mutex);
1411
1412         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1413                 ppd = dd->pport + pidx;
1414
1415                 shutdown_led_override(ppd);
1416         }
1417         if (dd->flags & HFI1_HAS_SEND_DMA)
1418                 sdma_exit(dd);
1419
1420         hfi1_reset_cpu_counters(dd);
1421
1422         ret = hfi1_init(dd, 1);
1423
1424         if (ret)
1425                 dd_dev_err(dd,
1426                            "Reinitialize unit %u after reset failed with %d\n",
1427                            unit, ret);
1428         else
1429                 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1430                             unit);
1431
1432 bail:
1433         return ret;
1434 }
1435
1436 static inline void hfi1_setup_ib_header(struct hfi1_packet *packet)
1437 {
1438         packet->hdr = (struct hfi1_ib_message_header *)
1439                         hfi1_get_msgheader(packet->rcd,
1440                                            packet->rhf_addr);
1441         packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
1442 }
1443
1444 static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet)
1445 {
1446         struct hfi1_pportdata *ppd = packet->rcd->ppd;
1447
1448         /* slid and dlid cannot be 0 */
1449         if ((!packet->slid) || (!packet->dlid))
1450                 return -EINVAL;
1451
1452         /* Compare port lid with incoming packet dlid */
1453         if ((!(hfi1_is_16B_mcast(packet->dlid))) &&
1454             (packet->dlid !=
1455                 opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) {
1456                 if ((packet->dlid & ~((1 << ppd->lmc) - 1)) != ppd->lid)
1457                         return -EINVAL;
1458         }
1459
1460         /* No multicast packets with SC15 */
1461         if ((hfi1_is_16B_mcast(packet->dlid)) && (packet->sc == 0xF))
1462                 return -EINVAL;
1463
1464         /* Packets with permissive DLID always on SC15 */
1465         if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE),
1466                                          16B)) &&
1467             (packet->sc != 0xF))
1468                 return -EINVAL;
1469
1470         return 0;
1471 }
1472
1473 static int hfi1_setup_9B_packet(struct hfi1_packet *packet)
1474 {
1475         struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
1476         struct ib_header *hdr;
1477         u8 lnh;
1478
1479         hfi1_setup_ib_header(packet);
1480         hdr = packet->hdr;
1481
1482         lnh = ib_get_lnh(hdr);
1483         if (lnh == HFI1_LRH_BTH) {
1484                 packet->ohdr = &hdr->u.oth;
1485                 packet->grh = NULL;
1486         } else if (lnh == HFI1_LRH_GRH) {
1487                 u32 vtf;
1488
1489                 packet->ohdr = &hdr->u.l.oth;
1490                 packet->grh = &hdr->u.l.grh;
1491                 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1492                         goto drop;
1493                 vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1494                 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1495                         goto drop;
1496         } else {
1497                 goto drop;
1498         }
1499
1500         /* Query commonly used fields from packet header */
1501         packet->payload = packet->ebuf;
1502         packet->opcode = ib_bth_get_opcode(packet->ohdr);
1503         packet->slid = ib_get_slid(hdr);
1504         packet->dlid = ib_get_dlid(hdr);
1505         if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
1506                      (packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE))))
1507                 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1508                                 be16_to_cpu(IB_MULTICAST_LID_BASE);
1509         packet->sl = ib_get_sl(hdr);
1510         packet->sc = hfi1_9B_get_sc5(hdr, packet->rhf);
1511         packet->pad = ib_bth_get_pad(packet->ohdr);
1512         packet->extra_byte = 0;
1513         packet->pkey = ib_bth_get_pkey(packet->ohdr);
1514         packet->migrated = ib_bth_is_migration(packet->ohdr);
1515
1516         return 0;
1517 drop:
1518         ibp->rvp.n_pkt_drops++;
1519         return -EINVAL;
1520 }
1521
1522 static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
1523 {
1524         /*
1525          * Bypass packets have a different header/payload split
1526          * compared to an IB packet.
1527          * Current split is set such that 16 bytes of the actual
1528          * header is in the header buffer and the remining is in
1529          * the eager buffer. We chose 16 since hfi1 driver only
1530          * supports 16B bypass packets and we will be able to
1531          * receive the entire LRH with such a split.
1532          */
1533
1534         struct hfi1_ctxtdata *rcd = packet->rcd;
1535         struct hfi1_pportdata *ppd = rcd->ppd;
1536         struct hfi1_ibport *ibp = &ppd->ibport_data;
1537         u8 l4;
1538
1539         packet->hdr = (struct hfi1_16b_header *)
1540                         hfi1_get_16B_header(packet->rcd,
1541                                             packet->rhf_addr);
1542         l4 = hfi1_16B_get_l4(packet->hdr);
1543         if (l4 == OPA_16B_L4_IB_LOCAL) {
1544                 packet->ohdr = packet->ebuf;
1545                 packet->grh = NULL;
1546                 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1547                 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
1548                 /* hdr_len_by_opcode already has an IB LRH factored in */
1549                 packet->hlen = hdr_len_by_opcode[packet->opcode] +
1550                         (LRH_16B_BYTES - LRH_9B_BYTES);
1551                 packet->migrated = opa_bth_is_migration(packet->ohdr);
1552         } else if (l4 == OPA_16B_L4_IB_GLOBAL) {
1553                 u32 vtf;
1554                 u8 grh_len = sizeof(struct ib_grh);
1555
1556                 packet->ohdr = packet->ebuf + grh_len;
1557                 packet->grh = packet->ebuf;
1558                 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1559                 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
1560                 /* hdr_len_by_opcode already has an IB LRH factored in */
1561                 packet->hlen = hdr_len_by_opcode[packet->opcode] +
1562                         (LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
1563                 packet->migrated = opa_bth_is_migration(packet->ohdr);
1564
1565                 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1566                         goto drop;
1567                 vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1568                 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1569                         goto drop;
1570         } else if (l4 == OPA_16B_L4_FM) {
1571                 packet->mgmt = packet->ebuf;
1572                 packet->ohdr = NULL;
1573                 packet->grh = NULL;
1574                 packet->opcode = IB_OPCODE_UD_SEND_ONLY;
1575                 packet->pad = OPA_16B_L4_FM_PAD;
1576                 packet->hlen = OPA_16B_L4_FM_HLEN;
1577                 packet->migrated = false;
1578         } else {
1579                 goto drop;
1580         }
1581
1582         /* Query commonly used fields from packet header */
1583         packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;
1584         packet->slid = hfi1_16B_get_slid(packet->hdr);
1585         packet->dlid = hfi1_16B_get_dlid(packet->hdr);
1586         if (unlikely(hfi1_is_16B_mcast(packet->dlid)))
1587                 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1588                                 opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR),
1589                                             16B);
1590         packet->sc = hfi1_16B_get_sc(packet->hdr);
1591         packet->sl = ibp->sc_to_sl[packet->sc];
1592         packet->extra_byte = SIZE_OF_LT;
1593         packet->pkey = hfi1_16B_get_pkey(packet->hdr);
1594
1595         if (hfi1_bypass_ingress_pkt_check(packet))
1596                 goto drop;
1597
1598         return 0;
1599 drop:
1600         hfi1_cdbg(PKT, "%s: packet dropped", __func__);
1601         ibp->rvp.n_pkt_drops++;
1602         return -EINVAL;
1603 }
1604
1605 static void show_eflags_errs(struct hfi1_packet *packet)
1606 {
1607         struct hfi1_ctxtdata *rcd = packet->rcd;
1608         u32 rte = rhf_rcv_type_err(packet->rhf);
1609
1610         dd_dev_err(rcd->dd,
1611                    "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s] rte 0x%x\n",
1612                    rcd->ctxt, packet->rhf,
1613                    packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1614                    packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1615                    packet->rhf & RHF_DC_ERR ? "dc " : "",
1616                    packet->rhf & RHF_TID_ERR ? "tid " : "",
1617                    packet->rhf & RHF_LEN_ERR ? "len " : "",
1618                    packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1619                    packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1620                    rte);
1621 }
1622
1623 void handle_eflags(struct hfi1_packet *packet)
1624 {
1625         struct hfi1_ctxtdata *rcd = packet->rcd;
1626
1627         rcv_hdrerr(rcd, rcd->ppd, packet);
1628         if (rhf_err_flags(packet->rhf))
1629                 show_eflags_errs(packet);
1630 }
1631
1632 static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet)
1633 {
1634         struct hfi1_ibport *ibp;
1635         struct net_device *netdev;
1636         struct hfi1_ctxtdata *rcd = packet->rcd;
1637         struct napi_struct *napi = rcd->napi;
1638         struct sk_buff *skb;
1639         struct hfi1_netdev_rxq *rxq = container_of(napi,
1640                         struct hfi1_netdev_rxq, napi);
1641         u32 extra_bytes;
1642         u32 tlen, qpnum;
1643         bool do_work, do_cnp;
1644
1645         trace_hfi1_rcvhdr(packet);
1646
1647         hfi1_setup_ib_header(packet);
1648
1649         packet->ohdr = &((struct ib_header *)packet->hdr)->u.oth;
1650         packet->grh = NULL;
1651
1652         if (unlikely(rhf_err_flags(packet->rhf))) {
1653                 handle_eflags(packet);
1654                 return;
1655         }
1656
1657         qpnum = ib_bth_get_qpn(packet->ohdr);
1658         netdev = hfi1_netdev_get_data(rcd->dd, qpnum);
1659         if (!netdev)
1660                 goto drop_no_nd;
1661
1662         trace_input_ibhdr(rcd->dd, packet, !!(rhf_dc_info(packet->rhf)));
1663         trace_ctxt_rsm_hist(rcd->ctxt);
1664
1665         /* handle congestion notifications */
1666         do_work = hfi1_may_ecn(packet);
1667         if (unlikely(do_work)) {
1668                 do_cnp = (packet->opcode != IB_OPCODE_CNP);
1669                 (void)hfi1_process_ecn_slowpath(hfi1_ipoib_priv(netdev)->qp,
1670                                                  packet, do_cnp);
1671         }
1672
1673         /*
1674          * We have split point after last byte of DETH
1675          * lets strip padding and CRC and ICRC.
1676          * tlen is whole packet len so we need to
1677          * subtract header size as well.
1678          */
1679         tlen = packet->tlen;
1680         extra_bytes = ib_bth_get_pad(packet->ohdr) + (SIZE_OF_CRC << 2) +
1681                         packet->hlen;
1682         if (unlikely(tlen < extra_bytes))
1683                 goto drop;
1684
1685         tlen -= extra_bytes;
1686
1687         skb = hfi1_ipoib_prepare_skb(rxq, tlen, packet->ebuf);
1688         if (unlikely(!skb))
1689                 goto drop;
1690
1691         dev_sw_netstats_rx_add(netdev, skb->len);
1692
1693         skb->dev = netdev;
1694         skb->pkt_type = PACKET_HOST;
1695         netif_receive_skb(skb);
1696
1697         return;
1698
1699 drop:
1700         ++netdev->stats.rx_dropped;
1701 drop_no_nd:
1702         ibp = rcd_to_iport(packet->rcd);
1703         ++ibp->rvp.n_pkt_drops;
1704 }
1705
1706 /*
1707  * The following functions are called by the interrupt handler. They are type
1708  * specific handlers for each packet type.
1709  */
1710 static void process_receive_ib(struct hfi1_packet *packet)
1711 {
1712         if (hfi1_setup_9B_packet(packet))
1713                 return;
1714
1715         if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1716                 return;
1717
1718         trace_hfi1_rcvhdr(packet);
1719
1720         if (unlikely(rhf_err_flags(packet->rhf))) {
1721                 handle_eflags(packet);
1722                 return;
1723         }
1724
1725         hfi1_ib_rcv(packet);
1726 }
1727
1728 static void process_receive_bypass(struct hfi1_packet *packet)
1729 {
1730         struct hfi1_devdata *dd = packet->rcd->dd;
1731
1732         if (hfi1_setup_bypass_packet(packet))
1733                 return;
1734
1735         trace_hfi1_rcvhdr(packet);
1736
1737         if (unlikely(rhf_err_flags(packet->rhf))) {
1738                 handle_eflags(packet);
1739                 return;
1740         }
1741
1742         if (hfi1_16B_get_l2(packet->hdr) == 0x2) {
1743                 hfi1_16B_rcv(packet);
1744         } else {
1745                 dd_dev_err(dd,
1746                            "Bypass packets other than 16B are not supported in normal operation. Dropping\n");
1747                 incr_cntr64(&dd->sw_rcv_bypass_packet_errors);
1748                 if (!(dd->err_info_rcvport.status_and_code &
1749                       OPA_EI_STATUS_SMASK)) {
1750                         u64 *flits = packet->ebuf;
1751
1752                         if (flits && !(packet->rhf & RHF_LEN_ERR)) {
1753                                 dd->err_info_rcvport.packet_flit1 = flits[0];
1754                                 dd->err_info_rcvport.packet_flit2 =
1755                                         packet->tlen > sizeof(flits[0]) ?
1756                                         flits[1] : 0;
1757                         }
1758                         dd->err_info_rcvport.status_and_code |=
1759                                 (OPA_EI_STATUS_SMASK | BAD_L2_ERR);
1760                 }
1761         }
1762 }
1763
1764 static void process_receive_error(struct hfi1_packet *packet)
1765 {
1766         /* KHdrHCRCErr -- KDETH packet with a bad HCRC */
1767         if (unlikely(
1768                  hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&
1769                  (rhf_rcv_type_err(packet->rhf) == RHF_RCV_TYPE_ERROR ||
1770                   packet->rhf & RHF_DC_ERR)))
1771                 return;
1772
1773         hfi1_setup_ib_header(packet);
1774         handle_eflags(packet);
1775
1776         if (unlikely(rhf_err_flags(packet->rhf)))
1777                 dd_dev_err(packet->rcd->dd,
1778                            "Unhandled error packet received. Dropping.\n");
1779 }
1780
1781 static void kdeth_process_expected(struct hfi1_packet *packet)
1782 {
1783         hfi1_setup_9B_packet(packet);
1784         if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1785                 return;
1786
1787         if (unlikely(rhf_err_flags(packet->rhf))) {
1788                 struct hfi1_ctxtdata *rcd = packet->rcd;
1789
1790                 if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))
1791                         return;
1792         }
1793
1794         hfi1_kdeth_expected_rcv(packet);
1795 }
1796
1797 static void kdeth_process_eager(struct hfi1_packet *packet)
1798 {
1799         hfi1_setup_9B_packet(packet);
1800         if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1801                 return;
1802
1803         trace_hfi1_rcvhdr(packet);
1804         if (unlikely(rhf_err_flags(packet->rhf))) {
1805                 struct hfi1_ctxtdata *rcd = packet->rcd;
1806
1807                 show_eflags_errs(packet);
1808                 if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))
1809                         return;
1810         }
1811
1812         hfi1_kdeth_eager_rcv(packet);
1813 }
1814
1815 static void process_receive_invalid(struct hfi1_packet *packet)
1816 {
1817         dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1818                    rhf_rcv_type(packet->rhf));
1819 }
1820
1821 #define HFI1_RCVHDR_DUMP_MAX    5
1822
1823 void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
1824 {
1825         struct hfi1_packet packet;
1826         struct ps_mdata mdata;
1827         int i;
1828
1829         seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s ctrl 0x%08llx status 0x%08llx, head %llu tail %llu  sw head %u\n",
1830                    rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd),
1831                    get_dma_rtail_setting(rcd) ?
1832                    "dma_rtail" : "nodma_rtail",
1833                    read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_CTRL),
1834                    read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_STATUS),
1835                    read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &
1836                    RCV_HDR_HEAD_HEAD_MASK,
1837                    read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL),
1838                    rcd->head);
1839
1840         init_packet(rcd, &packet);
1841         init_ps_mdata(&mdata, &packet);
1842
1843         for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) {
1844                 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
1845                                          rcd->rhf_offset;
1846                 struct ib_header *hdr;
1847                 u64 rhf = rhf_to_cpu(rhf_addr);
1848                 u32 etype = rhf_rcv_type(rhf), qpn;
1849                 u8 opcode;
1850                 u32 psn;
1851                 u8 lnh;
1852
1853                 if (ps_done(&mdata, rhf, rcd))
1854                         break;
1855
1856                 if (ps_skip(&mdata, rhf, rcd))
1857                         goto next;
1858
1859                 if (etype > RHF_RCV_TYPE_IB)
1860                         goto next;
1861
1862                 packet.hdr = hfi1_get_msgheader(rcd, rhf_addr);
1863                 hdr = packet.hdr;
1864
1865                 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
1866
1867                 if (lnh == HFI1_LRH_BTH)
1868                         packet.ohdr = &hdr->u.oth;
1869                 else if (lnh == HFI1_LRH_GRH)
1870                         packet.ohdr = &hdr->u.l.oth;
1871                 else
1872                         goto next; /* just in case */
1873
1874                 opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24);
1875                 qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK;
1876                 psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2]));
1877
1878                 seq_printf(s, "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n",
1879                            mdata.ps_head, opcode, qpn, psn);
1880 next:
1881                 update_ps_mdata(&mdata, rcd);
1882         }
1883 }
1884
1885 const rhf_rcv_function_ptr normal_rhf_rcv_functions[] = {
1886         [RHF_RCV_TYPE_EXPECTED] = kdeth_process_expected,
1887         [RHF_RCV_TYPE_EAGER] = kdeth_process_eager,
1888         [RHF_RCV_TYPE_IB] = process_receive_ib,
1889         [RHF_RCV_TYPE_ERROR] = process_receive_error,
1890         [RHF_RCV_TYPE_BYPASS] = process_receive_bypass,
1891         [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
1892         [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
1893         [RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
1894 };
1895
1896 const rhf_rcv_function_ptr netdev_rhf_rcv_functions[] = {
1897         [RHF_RCV_TYPE_EXPECTED] = process_receive_invalid,
1898         [RHF_RCV_TYPE_EAGER] = process_receive_invalid,
1899         [RHF_RCV_TYPE_IB] = hfi1_ipoib_ib_rcv,
1900         [RHF_RCV_TYPE_ERROR] = process_receive_error,
1901         [RHF_RCV_TYPE_BYPASS] = hfi1_vnic_bypass_rcv,
1902         [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
1903         [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
1904         [RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
1905 };