drivers/infiniband/hw/hfi1/driver.c

   1 /*
   2  * Copyright(c) 2015, 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include <linux/spinlock.h>
  49 #include <linux/pci.h>
  50 #include <linux/io.h>
  51 #include <linux/delay.h>
  52 #include <linux/netdevice.h>
  53 #include <linux/vmalloc.h>
  54 #include <linux/module.h>
  55 #include <linux/prefetch.h>
  56 #include <rdma/ib_verbs.h>
  57
  58 #include "hfi.h"
  59 #include "trace.h"
  60 #include "qp.h"
  61 #include "sdma.h"
  62
  63 #undef pr_fmt
  64 #define pr_fmt(fmt) DRIVER_NAME ": " fmt
  65
  66 /*
  67  * The size has to be longer than this string, so we can append
  68  * board/chip information to it in the initialization code.
  69  */
  70 const char ib_hfi1_version[] = HFI1_DRIVER_VERSION "\n";
  71
  72 DEFINE_SPINLOCK(hfi1_devs_lock);
  73 LIST_HEAD(hfi1_dev_list);
  74 DEFINE_MUTEX(hfi1_mutex);       /* general driver use */
  75
  76 unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
  77 module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
  78 MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
  79                  HFI1_DEFAULT_MAX_MTU));
  80
  81 unsigned int hfi1_cu = 1;
  82 module_param_named(cu, hfi1_cu, uint, S_IRUGO);
  83 MODULE_PARM_DESC(cu, "Credit return units");
  84
  85 unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
  86 static int hfi1_caps_set(const char *, const struct kernel_param *);
  87 static int hfi1_caps_get(char *, const struct kernel_param *);
  88 static const struct kernel_param_ops cap_ops = {
  89         .set = hfi1_caps_set,
  90         .get = hfi1_caps_get
  91 };
  92 module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
  93 MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
  94
  95 MODULE_LICENSE("Dual BSD/GPL");
  96 MODULE_DESCRIPTION("Intel Omni-Path Architecture driver");
  97 MODULE_VERSION(HFI1_DRIVER_VERSION);
  98
  99 /*
 100  * MAX_PKT_RCV is the max # if packets processed per receive interrupt.
 101  */
 102 #define MAX_PKT_RECV 64
 103 #define EGR_HEAD_UPDATE_THRESHOLD 16
 104
 105 struct hfi1_ib_stats hfi1_stats;
 106
 107 static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
 108 {
 109         int ret = 0;
 110         unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
 111                 cap_mask = *cap_mask_ptr, value, diff,
 112                 write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
 113                               HFI1_CAP_WRITABLE_MASK);
 114
 115         ret = kstrtoul(val, 0, &value);
 116         if (ret) {
 117                 pr_warn("Invalid module parameter value for 'cap_mask'\n");
 118                 goto done;
 119         }
 120         /* Get the changed bits (except the locked bit) */
 121         diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
 122
 123         /* Remove any bits that are not allowed to change after driver load */
 124         if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
 125                 pr_warn("Ignoring non-writable capability bits %#lx\n",
 126                         diff & ~write_mask);
 127                 diff &= write_mask;
 128         }
 129
 130         /* Mask off any reserved bits */
 131         diff &= ~HFI1_CAP_RESERVED_MASK;
 132         /* Clear any previously set and changing bits */
 133         cap_mask &= ~diff;
 134         /* Update the bits with the new capability */
 135         cap_mask |= (value & diff);
 136         /* Check for any kernel/user restrictions */
 137         diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
 138                 ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
 139         cap_mask &= ~diff;
 140         /* Set the bitmask to the final set */
 141         *cap_mask_ptr = cap_mask;
 142 done:
 143         return ret;
 144 }
 145
 146 static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
 147 {
 148         unsigned long cap_mask = *(unsigned long *)kp->arg;
 149
 150         cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
 151         cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
 152
 153         return scnprintf(buffer, PAGE_SIZE, "0x%lx", cap_mask);
 154 }
 155
 156 const char *get_unit_name(int unit)
 157 {
 158         static char iname[16];
 159
 160         snprintf(iname, sizeof(iname), DRIVER_NAME "_%u", unit);
 161         return iname;
 162 }
 163
 164 const char *get_card_name(struct rvt_dev_info *rdi)
 165 {
 166         struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
 167         struct hfi1_devdata *dd = container_of(ibdev,
 168                                                struct hfi1_devdata, verbs_dev);
 169         return get_unit_name(dd->unit);
 170 }
 171
 172 struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
 173 {
 174         struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
 175         struct hfi1_devdata *dd = container_of(ibdev,
 176                                                struct hfi1_devdata, verbs_dev);
 177         return dd->pcidev;
 178 }
 179
 180 /*
 181  * Return count of units with at least one port ACTIVE.
 182  */
 183 int hfi1_count_active_units(void)
 184 {
 185         struct hfi1_devdata *dd;
 186         struct hfi1_pportdata *ppd;
 187         unsigned long flags;
 188         int pidx, nunits_active = 0;
 189
 190         spin_lock_irqsave(&hfi1_devs_lock, flags);
 191         list_for_each_entry(dd, &hfi1_dev_list, list) {
 192                 if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase)
 193                         continue;
 194                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 195                         ppd = dd->pport + pidx;
 196                         if (ppd->lid && ppd->linkup) {
 197                                 nunits_active++;
 198                                 break;
 199                         }
 200                 }
 201         }
 202         spin_unlock_irqrestore(&hfi1_devs_lock, flags);
 203         return nunits_active;
 204 }
 205
 206 /*
 207  * Return count of all units, optionally return in arguments
 208  * the number of usable (present) units, and the number of
 209  * ports that are up.
 210  */
 211 int hfi1_count_units(int *npresentp, int *nupp)
 212 {
 213         int nunits = 0, npresent = 0, nup = 0;
 214         struct hfi1_devdata *dd;
 215         unsigned long flags;
 216         int pidx;
 217         struct hfi1_pportdata *ppd;
 218
 219         spin_lock_irqsave(&hfi1_devs_lock, flags);
 220
 221         list_for_each_entry(dd, &hfi1_dev_list, list) {
 222                 nunits++;
 223                 if ((dd->flags & HFI1_PRESENT) && dd->kregbase)
 224                         npresent++;
 225                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 226                         ppd = dd->pport + pidx;
 227                         if (ppd->lid && ppd->linkup)
 228                                 nup++;
 229                 }
 230         }
 231
 232         spin_unlock_irqrestore(&hfi1_devs_lock, flags);
 233
 234         if (npresentp)
 235                 *npresentp = npresent;
 236         if (nupp)
 237                 *nupp = nup;
 238
 239         return nunits;
 240 }
 241
 242 /*
 243  * Get address of eager buffer from it's index (allocated in chunks, not
 244  * contiguous).
 245  */
 246 static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
 247                                u8 *update)
 248 {
 249         u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
 250
 251         *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
 252         return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
 253                         (offset * RCV_BUF_BLOCK_SIZE));
 254 }
 255
 256 /*
 257  * Validate and encode the a given RcvArray Buffer size.
 258  * The function will check whether the given size falls within
 259  * allowed size ranges for the respective type and, optionally,
 260  * return the proper encoding.
 261  */
 262 inline int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
 263 {
 264         if (unlikely(!PAGE_ALIGNED(size)))
 265                 return 0;
 266         if (unlikely(size < MIN_EAGER_BUFFER))
 267                 return 0;
 268         if (size >
 269             (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
 270                 return 0;
 271         if (encoded)
 272                 *encoded = ilog2(size / PAGE_SIZE) + 1;
 273         return 1;
 274 }
 275
 276 static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
 277                        struct hfi1_packet *packet)
 278 {
 279         struct ib_header *rhdr = packet->hdr;
 280         u32 rte = rhf_rcv_type_err(packet->rhf);
 281         int lnh = be16_to_cpu(rhdr->lrh[0]) & 3;
 282         struct hfi1_ibport *ibp = &ppd->ibport_data;
 283         struct hfi1_devdata *dd = ppd->dd;
 284         struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
 285
 286         if (packet->rhf & (RHF_VCRC_ERR | RHF_ICRC_ERR))
 287                 return;
 288
 289         if (packet->rhf & RHF_TID_ERR) {
 290                 /* For TIDERR and RC QPs preemptively schedule a NAK */
 291                 struct ib_other_headers *ohdr = NULL;
 292                 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 293                 u16 lid  = be16_to_cpu(rhdr->lrh[1]);
 294                 u32 qp_num;
 295                 u32 rcv_flags = 0;
 296
 297                 /* Sanity check packet */
 298                 if (tlen < 24)
 299                         goto drop;
 300
 301                 /* Check for GRH */
 302                 if (lnh == HFI1_LRH_BTH) {
 303                         ohdr = &rhdr->u.oth;
 304                 } else if (lnh == HFI1_LRH_GRH) {
 305                         u32 vtf;
 306
 307                         ohdr = &rhdr->u.l.oth;
 308                         if (rhdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
 309                                 goto drop;
 310                         vtf = be32_to_cpu(rhdr->u.l.grh.version_tclass_flow);
 311                         if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
 312                                 goto drop;
 313                         rcv_flags |= HFI1_HAS_GRH;
 314                 } else {
 315                         goto drop;
 316                 }
 317                 /* Get the destination QP number. */
 318                 qp_num = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;
 319                 if (lid < be16_to_cpu(IB_MULTICAST_LID_BASE)) {
 320                         struct rvt_qp *qp;
 321                         unsigned long flags;
 322
 323                         rcu_read_lock();
 324                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
 325                         if (!qp) {
 326                                 rcu_read_unlock();
 327                                 goto drop;
 328                         }
 329
 330                         /*
 331                          * Handle only RC QPs - for other QP types drop error
 332                          * packet.
 333                          */
 334                         spin_lock_irqsave(&qp->r_lock, flags);
 335
 336                         /* Check for valid receive state. */
 337                         if (!(ib_rvt_state_ops[qp->state] &
 338                               RVT_PROCESS_RECV_OK)) {
 339                                 ibp->rvp.n_pkt_drops++;
 340                         }
 341
 342                         switch (qp->ibqp.qp_type) {
 343                         case IB_QPT_RC:
 344                                 hfi1_rc_hdrerr(
 345                                         rcd,
 346                                         rhdr,
 347                                         rcv_flags,
 348                                         qp);
 349                                 break;
 350                         default:
 351                                 /* For now don't handle any other QP types */
 352                                 break;
 353                         }
 354
 355                         spin_unlock_irqrestore(&qp->r_lock, flags);
 356                         rcu_read_unlock();
 357                 } /* Unicast QP */
 358         } /* Valid packet with TIDErr */
 359
 360         /* handle "RcvTypeErr" flags */
 361         switch (rte) {
 362         case RHF_RTE_ERROR_OP_CODE_ERR:
 363         {
 364                 u32 opcode;
 365                 void *ebuf = NULL;
 366                 __be32 *bth = NULL;
 367
 368                 if (rhf_use_egr_bfr(packet->rhf))
 369                         ebuf = packet->ebuf;
 370
 371                 if (!ebuf)
 372                         goto drop; /* this should never happen */
 373
 374                 if (lnh == HFI1_LRH_BTH)
 375                         bth = (__be32 *)ebuf;
 376                 else if (lnh == HFI1_LRH_GRH)
 377                         bth = (__be32 *)((char *)ebuf + sizeof(struct ib_grh));
 378                 else
 379                         goto drop;
 380
 381                 opcode = be32_to_cpu(bth[0]) >> 24;
 382                 opcode &= 0xff;
 383
 384                 if (opcode == IB_OPCODE_CNP) {
 385                         /*
 386                          * Only in pre-B0 h/w is the CNP_OPCODE handled
 387                          * via this code path.
 388                          */
 389                         struct rvt_qp *qp = NULL;
 390                         u32 lqpn, rqpn;
 391                         u16 rlid;
 392                         u8 svc_type, sl, sc5;
 393
 394                         sc5 = hdr2sc(rhdr, packet->rhf);
 395                         sl = ibp->sc_to_sl[sc5];
 396
 397                         lqpn = be32_to_cpu(bth[1]) & RVT_QPN_MASK;
 398                         rcu_read_lock();
 399                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
 400                         if (!qp) {
 401                                 rcu_read_unlock();
 402                                 goto drop;
 403                         }
 404
 405                         switch (qp->ibqp.qp_type) {
 406                         case IB_QPT_UD:
 407                                 rlid = 0;
 408                                 rqpn = 0;
 409                                 svc_type = IB_CC_SVCTYPE_UD;
 410                                 break;
 411                         case IB_QPT_UC:
 412                                 rlid = be16_to_cpu(rhdr->lrh[3]);
 413                                 rqpn = qp->remote_qpn;
 414                                 svc_type = IB_CC_SVCTYPE_UC;
 415                                 break;
 416                         default:
 417                                 goto drop;
 418                         }
 419
 420                         process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 421                         rcu_read_unlock();
 422                 }
 423
 424                 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
 425                 break;
 426         }
 427         default:
 428                 break;
 429         }
 430
 431 drop:
 432         return;
 433 }
 434
 435 static inline void init_packet(struct hfi1_ctxtdata *rcd,
 436                                struct hfi1_packet *packet)
 437 {
 438         packet->rsize = rcd->rcvhdrqentsize; /* words */
 439         packet->maxcnt = rcd->rcvhdrq_cnt * packet->rsize; /* words */
 440         packet->rcd = rcd;
 441         packet->updegr = 0;
 442         packet->etail = -1;
 443         packet->rhf_addr = get_rhf_addr(rcd);
 444         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 445         packet->rhqoff = rcd->head;
 446         packet->numpkt = 0;
 447         packet->rcv_flags = 0;
 448 }
 449
 450 void hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
 451                                bool do_cnp)
 452 {
 453         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 454         struct ib_header *hdr = pkt->hdr;
 455         struct ib_other_headers *ohdr = pkt->ohdr;
 456         struct ib_grh *grh = NULL;
 457         u32 rqpn = 0, bth1;
 458         u16 rlid, dlid = be16_to_cpu(hdr->lrh[1]);
 459         u8 sc, svc_type;
 460         bool is_mcast = false;
 461
 462         if (pkt->rcv_flags & HFI1_HAS_GRH)
 463                 grh = &hdr->u.l.grh;
 464
 465         switch (qp->ibqp.qp_type) {
 466         case IB_QPT_SMI:
 467         case IB_QPT_GSI:
 468         case IB_QPT_UD:
 469                 rlid = be16_to_cpu(hdr->lrh[3]);
 470                 rqpn = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;
 471                 svc_type = IB_CC_SVCTYPE_UD;
 472                 is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
 473                         (dlid != be16_to_cpu(IB_LID_PERMISSIVE));
 474                 break;
 475         case IB_QPT_UC:
 476                 rlid = qp->remote_ah_attr.dlid;
 477                 rqpn = qp->remote_qpn;
 478                 svc_type = IB_CC_SVCTYPE_UC;
 479                 break;
 480         case IB_QPT_RC:
 481                 rlid = qp->remote_ah_attr.dlid;
 482                 rqpn = qp->remote_qpn;
 483                 svc_type = IB_CC_SVCTYPE_RC;
 484                 break;
 485         default:
 486                 return;
 487         }
 488
 489         sc = hdr2sc(hdr, pkt->rhf);
 490
 491         bth1 = be32_to_cpu(ohdr->bth[1]);
 492         if (do_cnp && (bth1 & HFI1_FECN_SMASK)) {
 493                 u16 pkey = (u16)be32_to_cpu(ohdr->bth[0]);
 494
 495                 return_cnp(ibp, qp, rqpn, pkey, dlid, rlid, sc, grh);
 496         }
 497
 498         if (!is_mcast && (bth1 & HFI1_BECN_SMASK)) {
 499                 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 500                 u32 lqpn = bth1 & RVT_QPN_MASK;
 501                 u8 sl = ibp->sc_to_sl[sc];
 502
 503                 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 504         }
 505
 506 }
 507
 508 struct ps_mdata {
 509         struct hfi1_ctxtdata *rcd;
 510         u32 rsize;
 511         u32 maxcnt;
 512         u32 ps_head;
 513         u32 ps_tail;
 514         u32 ps_seq;
 515 };
 516
 517 static inline void init_ps_mdata(struct ps_mdata *mdata,
 518                                  struct hfi1_packet *packet)
 519 {
 520         struct hfi1_ctxtdata *rcd = packet->rcd;
 521
 522         mdata->rcd = rcd;
 523         mdata->rsize = packet->rsize;
 524         mdata->maxcnt = packet->maxcnt;
 525         mdata->ps_head = packet->rhqoff;
 526
 527         if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 528                 mdata->ps_tail = get_rcvhdrtail(rcd);
 529                 if (rcd->ctxt == HFI1_CTRL_CTXT)
 530                         mdata->ps_seq = rcd->seq_cnt;
 531                 else
 532                         mdata->ps_seq = 0; /* not used with DMA_RTAIL */
 533         } else {
 534                 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
 535                 mdata->ps_seq = rcd->seq_cnt;
 536         }
 537 }
 538
 539 static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
 540                           struct hfi1_ctxtdata *rcd)
 541 {
 542         if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL))
 543                 return mdata->ps_head == mdata->ps_tail;
 544         return mdata->ps_seq != rhf_rcv_seq(rhf);
 545 }
 546
 547 static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
 548                           struct hfi1_ctxtdata *rcd)
 549 {
 550         /*
 551          * Control context can potentially receive an invalid rhf.
 552          * Drop such packets.
 553          */
 554         if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
 555                 return mdata->ps_seq != rhf_rcv_seq(rhf);
 556
 557         return 0;
 558 }
 559
 560 static inline void update_ps_mdata(struct ps_mdata *mdata,
 561                                    struct hfi1_ctxtdata *rcd)
 562 {
 563         mdata->ps_head += mdata->rsize;
 564         if (mdata->ps_head >= mdata->maxcnt)
 565                 mdata->ps_head = 0;
 566
 567         /* Control context must do seq counting */
 568         if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ||
 569             (rcd->ctxt == HFI1_CTRL_CTXT)) {
 570                 if (++mdata->ps_seq > 13)
 571                         mdata->ps_seq = 1;
 572         }
 573 }
 574
 575 /*
 576  * prescan_rxq - search through the receive queue looking for packets
 577  * containing Excplicit Congestion Notifications (FECNs, or BECNs).
 578  * When an ECN is found, process the Congestion Notification, and toggle
 579  * it off.
 580  * This is declared as a macro to allow quick checking of the port to avoid
 581  * the overhead of a function call if not enabled.
 582  */
 583 #define prescan_rxq(rcd, packet) \
 584         do { \
 585                 if (rcd->ppd->cc_prescan) \
 586                         __prescan_rxq(packet); \
 587         } while (0)
 588 static void __prescan_rxq(struct hfi1_packet *packet)
 589 {
 590         struct hfi1_ctxtdata *rcd = packet->rcd;
 591         struct ps_mdata mdata;
 592
 593         init_ps_mdata(&mdata, packet);
 594
 595         while (1) {
 596                 struct hfi1_devdata *dd = rcd->dd;
 597                 struct hfi1_ibport *ibp = &rcd->ppd->ibport_data;
 598                 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
 599                                          dd->rhf_offset;
 600                 struct rvt_qp *qp;
 601                 struct ib_header *hdr;
 602                 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
 603                 u64 rhf = rhf_to_cpu(rhf_addr);
 604                 u32 etype = rhf_rcv_type(rhf), qpn, bth1;
 605                 int is_ecn = 0;
 606                 u8 lnh;
 607
 608                 if (ps_done(&mdata, rhf, rcd))
 609                         break;
 610
 611                 if (ps_skip(&mdata, rhf, rcd))
 612                         goto next;
 613
 614                 if (etype != RHF_RCV_TYPE_IB)
 615                         goto next;
 616
 617                 packet->hdr = hfi1_get_msgheader(dd, rhf_addr);
 618                 hdr = packet->hdr;
 619
 620                 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
 621
 622                 if (lnh == HFI1_LRH_BTH) {
 623                         packet->ohdr = &hdr->u.oth;
 624                 } else if (lnh == HFI1_LRH_GRH) {
 625                         packet->ohdr = &hdr->u.l.oth;
 626                         packet->rcv_flags |= HFI1_HAS_GRH;
 627                 } else {
 628                         goto next; /* just in case */
 629                 }
 630
 631                 bth1 = be32_to_cpu(packet->ohdr->bth[1]);
 632                 is_ecn = !!(bth1 & (HFI1_FECN_SMASK | HFI1_BECN_SMASK));
 633
 634                 if (!is_ecn)
 635                         goto next;
 636
 637                 qpn = bth1 & RVT_QPN_MASK;
 638                 rcu_read_lock();
 639                 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
 640
 641                 if (!qp) {
 642                         rcu_read_unlock();
 643                         goto next;
 644                 }
 645
 646                 process_ecn(qp, packet, true);
 647                 rcu_read_unlock();
 648
 649                 /* turn off BECN, FECN */
 650                 bth1 &= ~(HFI1_FECN_SMASK | HFI1_BECN_SMASK);
 651                 packet->ohdr->bth[1] = cpu_to_be32(bth1);
 652 next:
 653                 update_ps_mdata(&mdata, rcd);
 654         }
 655 }
 656
 657 static inline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
 658 {
 659         int ret = RCV_PKT_OK;
 660
 661         /* Set up for the next packet */
 662         packet->rhqoff += packet->rsize;
 663         if (packet->rhqoff >= packet->maxcnt)
 664                 packet->rhqoff = 0;
 665
 666         packet->numpkt++;
 667         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) {
 668                 if (thread) {
 669                         cond_resched();
 670                 } else {
 671                         ret = RCV_PKT_LIMIT;
 672                         this_cpu_inc(*packet->rcd->dd->rcv_limit);
 673                 }
 674         }
 675
 676         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 677                                      packet->rcd->dd->rhf_offset;
 678         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 679
 680         return ret;
 681 }
 682
 683 static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
 684 {
 685         int ret = RCV_PKT_OK;
 686
 687         packet->hdr = hfi1_get_msgheader(packet->rcd->dd,
 688                                          packet->rhf_addr);
 689         packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
 690         packet->etype = rhf_rcv_type(packet->rhf);
 691         /* total length */
 692         packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 693         /* retrieve eager buffer details */
 694         packet->ebuf = NULL;
 695         if (rhf_use_egr_bfr(packet->rhf)) {
 696                 packet->etail = rhf_egr_index(packet->rhf);
 697                 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
 698                                  &packet->updegr);
 699                 /*
 700                  * Prefetch the contents of the eager buffer.  It is
 701                  * OK to send a negative length to prefetch_range().
 702                  * The +2 is the size of the RHF.
 703                  */
 704                 prefetch_range(packet->ebuf,
 705                                packet->tlen - ((packet->rcd->rcvhdrqentsize -
 706                                                (rhf_hdrq_offset(packet->rhf)
 707                                                 + 2)) * 4));
 708         }
 709
 710         /*
 711          * Call a type specific handler for the packet. We
 712          * should be able to trust that etype won't be beyond
 713          * the range of valid indexes. If so something is really
 714          * wrong and we can probably just let things come
 715          * crashing down. There is no need to eat another
 716          * comparison in this performance critical code.
 717          */
 718         packet->rcd->dd->rhf_rcv_function_map[packet->etype](packet);
 719         packet->numpkt++;
 720
 721         /* Set up for the next packet */
 722         packet->rhqoff += packet->rsize;
 723         if (packet->rhqoff >= packet->maxcnt)
 724                 packet->rhqoff = 0;
 725
 726         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) {
 727                 if (thread) {
 728                         cond_resched();
 729                 } else {
 730                         ret = RCV_PKT_LIMIT;
 731                         this_cpu_inc(*packet->rcd->dd->rcv_limit);
 732                 }
 733         }
 734
 735         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 736                                       packet->rcd->dd->rhf_offset;
 737         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 738
 739         return ret;
 740 }
 741
 742 static inline void process_rcv_update(int last, struct hfi1_packet *packet)
 743 {
 744         /*
 745          * Update head regs etc., every 16 packets, if not last pkt,
 746          * to help prevent rcvhdrq overflows, when many packets
 747          * are processed and queue is nearly full.
 748          * Don't request an interrupt for intermediate updates.
 749          */
 750         if (!last && !(packet->numpkt & 0xf)) {
 751                 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
 752                                packet->etail, 0, 0);
 753                 packet->updegr = 0;
 754         }
 755         packet->rcv_flags = 0;
 756 }
 757
 758 static inline void finish_packet(struct hfi1_packet *packet)
 759 {
 760         /*
 761          * Nothing we need to free for the packet.
 762          *
 763          * The only thing we need to do is a final update and call for an
 764          * interrupt
 765          */
 766         update_usrhead(packet->rcd, packet->rcd->head, packet->updegr,
 767                        packet->etail, rcv_intr_dynamic, packet->numpkt);
 768 }
 769
 770 static inline void process_rcv_qp_work(struct hfi1_packet *packet)
 771 {
 772         struct hfi1_ctxtdata *rcd;
 773         struct rvt_qp *qp, *nqp;
 774
 775         rcd = packet->rcd;
 776         rcd->head = packet->rhqoff;
 777
 778         /*
 779          * Iterate over all QPs waiting to respond.
 780          * The list won't change since the IRQ is only run on one CPU.
 781          */
 782         list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
 783                 list_del_init(&qp->rspwait);
 784                 if (qp->r_flags & RVT_R_RSP_NAK) {
 785                         qp->r_flags &= ~RVT_R_RSP_NAK;
 786                         hfi1_send_rc_ack(rcd, qp, 0);
 787                 }
 788                 if (qp->r_flags & RVT_R_RSP_SEND) {
 789                         unsigned long flags;
 790
 791                         qp->r_flags &= ~RVT_R_RSP_SEND;
 792                         spin_lock_irqsave(&qp->s_lock, flags);
 793                         if (ib_rvt_state_ops[qp->state] &
 794                                         RVT_PROCESS_OR_FLUSH_SEND)
 795                                 hfi1_schedule_send(qp);
 796                         spin_unlock_irqrestore(&qp->s_lock, flags);
 797                 }
 798                 if (atomic_dec_and_test(&qp->refcount))
 799                         wake_up(&qp->wait);
 800         }
 801 }
 802
 803 /*
 804  * Handle receive interrupts when using the no dma rtail option.
 805  */
 806 int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 807 {
 808         u32 seq;
 809         int last = RCV_PKT_OK;
 810         struct hfi1_packet packet;
 811
 812         init_packet(rcd, &packet);
 813         seq = rhf_rcv_seq(packet.rhf);
 814         if (seq != rcd->seq_cnt) {
 815                 last = RCV_PKT_DONE;
 816                 goto bail;
 817         }
 818
 819         prescan_rxq(rcd, &packet);
 820
 821         while (last == RCV_PKT_OK) {
 822                 last = process_rcv_packet(&packet, thread);
 823                 seq = rhf_rcv_seq(packet.rhf);
 824                 if (++rcd->seq_cnt > 13)
 825                         rcd->seq_cnt = 1;
 826                 if (seq != rcd->seq_cnt)
 827                         last = RCV_PKT_DONE;
 828                 process_rcv_update(last, &packet);
 829         }
 830         process_rcv_qp_work(&packet);
 831 bail:
 832         finish_packet(&packet);
 833         return last;
 834 }
 835
 836 int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 837 {
 838         u32 hdrqtail;
 839         int last = RCV_PKT_OK;
 840         struct hfi1_packet packet;
 841
 842         init_packet(rcd, &packet);
 843         hdrqtail = get_rcvhdrtail(rcd);
 844         if (packet.rhqoff == hdrqtail) {
 845                 last = RCV_PKT_DONE;
 846                 goto bail;
 847         }
 848         smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 849
 850         prescan_rxq(rcd, &packet);
 851
 852         while (last == RCV_PKT_OK) {
 853                 last = process_rcv_packet(&packet, thread);
 854                 if (packet.rhqoff == hdrqtail)
 855                         last = RCV_PKT_DONE;
 856                 process_rcv_update(last, &packet);
 857         }
 858         process_rcv_qp_work(&packet);
 859 bail:
 860         finish_packet(&packet);
 861         return last;
 862 }
 863
 864 static inline void set_all_nodma_rtail(struct hfi1_devdata *dd)
 865 {
 866         int i;
 867
 868         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 869                 dd->rcd[i]->do_interrupt =
 870                         &handle_receive_interrupt_nodma_rtail;
 871 }
 872
 873 static inline void set_all_dma_rtail(struct hfi1_devdata *dd)
 874 {
 875         int i;
 876
 877         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 878                 dd->rcd[i]->do_interrupt =
 879                         &handle_receive_interrupt_dma_rtail;
 880 }
 881
 882 void set_all_slowpath(struct hfi1_devdata *dd)
 883 {
 884         int i;
 885
 886         /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
 887         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 888                 dd->rcd[i]->do_interrupt = &handle_receive_interrupt;
 889 }
 890
 891 static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd,
 892                                       struct hfi1_packet *packet,
 893                                       struct hfi1_devdata *dd)
 894 {
 895         struct work_struct *lsaw = &rcd->ppd->linkstate_active_work;
 896         struct ib_header *hdr = hfi1_get_msgheader(packet->rcd->dd,
 897                                                    packet->rhf_addr);
 898         u8 etype = rhf_rcv_type(packet->rhf);
 899
 900         if (etype == RHF_RCV_TYPE_IB && hdr2sc(hdr, packet->rhf) != 0xf) {
 901                 int hwstate = read_logical_state(dd);
 902
 903                 if (hwstate != LSTATE_ACTIVE) {
 904                         dd_dev_info(dd, "Unexpected link state %d\n", hwstate);
 905                         return 0;
 906                 }
 907
 908                 queue_work(rcd->ppd->hfi1_wq, lsaw);
 909                 return 1;
 910         }
 911         return 0;
 912 }
 913
 914 /*
 915  * handle_receive_interrupt - receive a packet
 916  * @rcd: the context
 917  *
 918  * Called from interrupt handler for errors or receive interrupt.
 919  * This is the slow path interrupt handler.
 920  */
 921 int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
 922 {
 923         struct hfi1_devdata *dd = rcd->dd;
 924         u32 hdrqtail;
 925         int needset, last = RCV_PKT_OK;
 926         struct hfi1_packet packet;
 927         int skip_pkt = 0;
 928
 929         /* Control context will always use the slow path interrupt handler */
 930         needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
 931
 932         init_packet(rcd, &packet);
 933
 934         if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 935                 u32 seq = rhf_rcv_seq(packet.rhf);
 936
 937                 if (seq != rcd->seq_cnt) {
 938                         last = RCV_PKT_DONE;
 939                         goto bail;
 940                 }
 941                 hdrqtail = 0;
 942         } else {
 943                 hdrqtail = get_rcvhdrtail(rcd);
 944                 if (packet.rhqoff == hdrqtail) {
 945                         last = RCV_PKT_DONE;
 946                         goto bail;
 947                 }
 948                 smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 949
 950                 /*
 951                  * Control context can potentially receive an invalid
 952                  * rhf. Drop such packets.
 953                  */
 954                 if (rcd->ctxt == HFI1_CTRL_CTXT) {
 955                         u32 seq = rhf_rcv_seq(packet.rhf);
 956
 957                         if (seq != rcd->seq_cnt)
 958                                 skip_pkt = 1;
 959                 }
 960         }
 961
 962         prescan_rxq(rcd, &packet);
 963
 964         while (last == RCV_PKT_OK) {
 965                 if (unlikely(dd->do_drop &&
 966                              atomic_xchg(&dd->drop_packet, DROP_PACKET_OFF) ==
 967                              DROP_PACKET_ON)) {
 968                         dd->do_drop = 0;
 969
 970                         /* On to the next packet */
 971                         packet.rhqoff += packet.rsize;
 972                         packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
 973                                           packet.rhqoff +
 974                                           dd->rhf_offset;
 975                         packet.rhf = rhf_to_cpu(packet.rhf_addr);
 976
 977                 } else if (skip_pkt) {
 978                         last = skip_rcv_packet(&packet, thread);
 979                         skip_pkt = 0;
 980                 } else {
 981                         /* Auto activate link on non-SC15 packet receive */
 982                         if (unlikely(rcd->ppd->host_link_state ==
 983                                      HLS_UP_ARMED) &&
 984                             set_armed_to_active(rcd, &packet, dd))
 985                                 goto bail;
 986                         last = process_rcv_packet(&packet, thread);
 987                 }
 988
 989                 if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 990                         u32 seq = rhf_rcv_seq(packet.rhf);
 991
 992                         if (++rcd->seq_cnt > 13)
 993                                 rcd->seq_cnt = 1;
 994                         if (seq != rcd->seq_cnt)
 995                                 last = RCV_PKT_DONE;
 996                         if (needset) {
 997                                 dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n");
 998                                 set_all_nodma_rtail(dd);
 999                                 needset = 0;
1000                         }
1001                 } else {
1002                         if (packet.rhqoff == hdrqtail)
1003                                 last = RCV_PKT_DONE;
1004                         /*
1005                          * Control context can potentially receive an invalid
1006                          * rhf. Drop such packets.
1007                          */
1008                         if (rcd->ctxt == HFI1_CTRL_CTXT) {
1009                                 u32 seq = rhf_rcv_seq(packet.rhf);
1010
1011                                 if (++rcd->seq_cnt > 13)
1012                                         rcd->seq_cnt = 1;
1013                                 if (!last && (seq != rcd->seq_cnt))
1014                                         skip_pkt = 1;
1015                         }
1016
1017                         if (needset) {
1018                                 dd_dev_info(dd,
1019                                             "Switching to DMA_RTAIL\n");
1020                                 set_all_dma_rtail(dd);
1021                                 needset = 0;
1022                         }
1023                 }
1024
1025                 process_rcv_update(last, &packet);
1026         }
1027
1028         process_rcv_qp_work(&packet);
1029
1030 bail:
1031         /*
1032          * Always write head at end, and setup rcv interrupt, even
1033          * if no packets were processed.
1034          */
1035         finish_packet(&packet);
1036         return last;
1037 }
1038
1039 /*
1040  * We may discover in the interrupt that the hardware link state has
1041  * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1042  * and we need to update the driver's notion of the link state.  We cannot
1043  * run set_link_state from interrupt context, so we queue this function on
1044  * a workqueue.
1045  *
1046  * We delay the regular interrupt processing until after the state changes
1047  * so that the link will be in the correct state by the time any application
1048  * we wake up attempts to send a reply to any message it received.
1049  * (Subsequent receive interrupts may possibly force the wakeup before we
1050  * update the link state.)
1051  *
1052  * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1053  * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1054  * so we're safe from use-after-free of the rcd.
1055  */
1056 void receive_interrupt_work(struct work_struct *work)
1057 {
1058         struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1059                                                   linkstate_active_work);
1060         struct hfi1_devdata *dd = ppd->dd;
1061         int i;
1062
1063         /* Received non-SC15 packet implies neighbor_normal */
1064         ppd->neighbor_normal = 1;
1065         set_link_state(ppd, HLS_UP_ACTIVE);
1066
1067         /*
1068          * Interrupt all kernel contexts that could have had an
1069          * interrupt during auto activation.
1070          */
1071         for (i = HFI1_CTRL_CTXT; i < dd->first_user_ctxt; i++)
1072                 force_recv_intr(dd->rcd[i]);
1073 }
1074
1075 /*
1076  * Convert a given MTU size to the on-wire MAD packet enumeration.
1077  * Return -1 if the size is invalid.
1078  */
1079 int mtu_to_enum(u32 mtu, int default_if_bad)
1080 {
1081         switch (mtu) {
1082         case     0: return OPA_MTU_0;
1083         case   256: return OPA_MTU_256;
1084         case   512: return OPA_MTU_512;
1085         case  1024: return OPA_MTU_1024;
1086         case  2048: return OPA_MTU_2048;
1087         case  4096: return OPA_MTU_4096;
1088         case  8192: return OPA_MTU_8192;
1089         case 10240: return OPA_MTU_10240;
1090         }
1091         return default_if_bad;
1092 }
1093
1094 u16 enum_to_mtu(int mtu)
1095 {
1096         switch (mtu) {
1097         case OPA_MTU_0:     return 0;
1098         case OPA_MTU_256:   return 256;
1099         case OPA_MTU_512:   return 512;
1100         case OPA_MTU_1024:  return 1024;
1101         case OPA_MTU_2048:  return 2048;
1102         case OPA_MTU_4096:  return 4096;
1103         case OPA_MTU_8192:  return 8192;
1104         case OPA_MTU_10240: return 10240;
1105         default: return 0xffff;
1106         }
1107 }
1108
1109 /*
1110  * set_mtu - set the MTU
1111  * @ppd: the per port data
1112  *
1113  * We can handle "any" incoming size, the issue here is whether we
1114  * need to restrict our outgoing size.  We do not deal with what happens
1115  * to programs that are already running when the size changes.
1116  */
1117 int set_mtu(struct hfi1_pportdata *ppd)
1118 {
1119         struct hfi1_devdata *dd = ppd->dd;
1120         int i, drain, ret = 0, is_up = 0;
1121
1122         ppd->ibmtu = 0;
1123         for (i = 0; i < ppd->vls_supported; i++)
1124                 if (ppd->ibmtu < dd->vld[i].mtu)
1125                         ppd->ibmtu = dd->vld[i].mtu;
1126         ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
1127
1128         mutex_lock(&ppd->hls_lock);
1129         if (ppd->host_link_state == HLS_UP_INIT ||
1130             ppd->host_link_state == HLS_UP_ARMED ||
1131             ppd->host_link_state == HLS_UP_ACTIVE)
1132                 is_up = 1;
1133
1134         drain = !is_ax(dd) && is_up;
1135
1136         if (drain)
1137                 /*
1138                  * MTU is specified per-VL. To ensure that no packet gets
1139                  * stuck (due, e.g., to the MTU for the packet's VL being
1140                  * reduced), empty the per-VL FIFOs before adjusting MTU.
1141                  */
1142                 ret = stop_drain_data_vls(dd);
1143
1144         if (ret) {
1145                 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1146                            __func__);
1147                 goto err;
1148         }
1149
1150         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
1151
1152         if (drain)
1153                 open_fill_data_vls(dd); /* reopen all VLs */
1154
1155 err:
1156         mutex_unlock(&ppd->hls_lock);
1157
1158         return ret;
1159 }
1160
1161 int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1162 {
1163         struct hfi1_devdata *dd = ppd->dd;
1164
1165         ppd->lid = lid;
1166         ppd->lmc = lmc;
1167         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
1168
1169         dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);
1170
1171         return 0;
1172 }
1173
1174 void shutdown_led_override(struct hfi1_pportdata *ppd)
1175 {
1176         struct hfi1_devdata *dd = ppd->dd;
1177
1178         /*
1179          * This pairs with the memory barrier in hfi1_start_led_override to
1180          * ensure that we read the correct state of LED beaconing represented
1181          * by led_override_timer_active
1182          */
1183         smp_rmb();
1184         if (atomic_read(&ppd->led_override_timer_active)) {
1185                 del_timer_sync(&ppd->led_override_timer);
1186                 atomic_set(&ppd->led_override_timer_active, 0);
1187                 /* Ensure the atomic_set is visible to all CPUs */
1188                 smp_wmb();
1189         }
1190
1191         /* Hand control of the LED to the DC for normal operation */
1192         write_csr(dd, DCC_CFG_LED_CNTRL, 0);
1193 }
1194
1195 static void run_led_override(unsigned long opaque)
1196 {
1197         struct hfi1_pportdata *ppd = (struct hfi1_pportdata *)opaque;
1198         struct hfi1_devdata *dd = ppd->dd;
1199         unsigned long timeout;
1200         int phase_idx;
1201
1202         if (!(dd->flags & HFI1_INITTED))
1203                 return;
1204
1205         phase_idx = ppd->led_override_phase & 1;
1206
1207         setextled(dd, phase_idx);
1208
1209         timeout = ppd->led_override_vals[phase_idx];
1210
1211         /* Set up for next phase */
1212         ppd->led_override_phase = !ppd->led_override_phase;
1213
1214         mod_timer(&ppd->led_override_timer, jiffies + timeout);
1215 }
1216
1217 /*
1218  * To have the LED blink in a particular pattern, provide timeon and timeoff
1219  * in milliseconds.
1220  * To turn off custom blinking and return to normal operation, use
1221  * shutdown_led_override()
1222  */
1223 void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1224                              unsigned int timeoff)
1225 {
1226         if (!(ppd->dd->flags & HFI1_INITTED))
1227                 return;
1228
1229         /* Convert to jiffies for direct use in timer */
1230         ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
1231         ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
1232
1233         /* Arbitrarily start from LED on phase */
1234         ppd->led_override_phase = 1;
1235
1236         /*
1237          * If the timer has not already been started, do so. Use a "quick"
1238          * timeout so the handler will be called soon to look at our request.
1239          */
1240         if (!timer_pending(&ppd->led_override_timer)) {
1241                 setup_timer(&ppd->led_override_timer, run_led_override,
1242                             (unsigned long)ppd);
1243                 ppd->led_override_timer.expires = jiffies + 1;
1244                 add_timer(&ppd->led_override_timer);
1245                 atomic_set(&ppd->led_override_timer_active, 1);
1246                 /* Ensure the atomic_set is visible to all CPUs */
1247                 smp_wmb();
1248         }
1249 }
1250
1251 /**
1252  * hfi1_reset_device - reset the chip if possible
1253  * @unit: the device to reset
1254  *
1255  * Whether or not reset is successful, we attempt to re-initialize the chip
1256  * (that is, much like a driver unload/reload).  We clear the INITTED flag
1257  * so that the various entry points will fail until we reinitialize.  For
1258  * now, we only allow this if no user contexts are open that use chip resources
1259  */
1260 int hfi1_reset_device(int unit)
1261 {
1262         int ret, i;
1263         struct hfi1_devdata *dd = hfi1_lookup(unit);
1264         struct hfi1_pportdata *ppd;
1265         unsigned long flags;
1266         int pidx;
1267
1268         if (!dd) {
1269                 ret = -ENODEV;
1270                 goto bail;
1271         }
1272
1273         dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1274
1275         if (!dd->kregbase || !(dd->flags & HFI1_PRESENT)) {
1276                 dd_dev_info(dd,
1277                             "Invalid unit number %u or not initialized or not present\n",
1278                             unit);
1279                 ret = -ENXIO;
1280                 goto bail;
1281         }
1282
1283         spin_lock_irqsave(&dd->uctxt_lock, flags);
1284         if (dd->rcd)
1285                 for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) {
1286                         if (!dd->rcd[i] || !dd->rcd[i]->cnt)
1287                                 continue;
1288                         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1289                         ret = -EBUSY;
1290                         goto bail;
1291                 }
1292         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1293
1294         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1295                 ppd = dd->pport + pidx;
1296
1297                 shutdown_led_override(ppd);
1298         }
1299         if (dd->flags & HFI1_HAS_SEND_DMA)
1300                 sdma_exit(dd);
1301
1302         hfi1_reset_cpu_counters(dd);
1303
1304         ret = hfi1_init(dd, 1);
1305
1306         if (ret)
1307                 dd_dev_err(dd,
1308                            "Reinitialize unit %u after reset failed with %d\n",
1309                            unit, ret);
1310         else
1311                 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1312                             unit);
1313
1314 bail:
1315         return ret;
1316 }
1317
1318 void handle_eflags(struct hfi1_packet *packet)
1319 {
1320         struct hfi1_ctxtdata *rcd = packet->rcd;
1321         u32 rte = rhf_rcv_type_err(packet->rhf);
1322
1323         rcv_hdrerr(rcd, rcd->ppd, packet);
1324         if (rhf_err_flags(packet->rhf))
1325                 dd_dev_err(rcd->dd,
1326                            "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s%s] rte 0x%x\n",
1327                            rcd->ctxt, packet->rhf,
1328                            packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1329                            packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1330                            packet->rhf & RHF_DC_ERR ? "dc " : "",
1331                            packet->rhf & RHF_TID_ERR ? "tid " : "",
1332                            packet->rhf & RHF_LEN_ERR ? "len " : "",
1333                            packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1334                            packet->rhf & RHF_VCRC_ERR ? "vcrc " : "",
1335                            packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1336                            rte);
1337 }
1338
1339 /*
1340  * The following functions are called by the interrupt handler. They are type
1341  * specific handlers for each packet type.
1342  */
1343 int process_receive_ib(struct hfi1_packet *packet)
1344 {
1345         trace_hfi1_rcvhdr(packet->rcd->ppd->dd,
1346                           packet->rcd->ctxt,
1347                           rhf_err_flags(packet->rhf),
1348                           RHF_RCV_TYPE_IB,
1349                           packet->hlen,
1350                           packet->tlen,
1351                           packet->updegr,
1352                           rhf_egr_index(packet->rhf));
1353
1354         if (unlikely(rhf_err_flags(packet->rhf))) {
1355                 handle_eflags(packet);
1356                 return RHF_RCV_CONTINUE;
1357         }
1358
1359         hfi1_ib_rcv(packet);
1360         return RHF_RCV_CONTINUE;
1361 }
1362
1363 int process_receive_bypass(struct hfi1_packet *packet)
1364 {
1365         struct hfi1_devdata *dd = packet->rcd->dd;
1366
1367         if (unlikely(rhf_err_flags(packet->rhf)))
1368                 handle_eflags(packet);
1369
1370         dd_dev_err(dd,
1371                    "Bypass packets are not supported in normal operation. Dropping\n");
1372         incr_cntr64(&dd->sw_rcv_bypass_packet_errors);
1373         if (!(dd->err_info_rcvport.status_and_code & OPA_EI_STATUS_SMASK)) {
1374                 u64 *flits = packet->ebuf;
1375
1376                 if (flits && !(packet->rhf & RHF_LEN_ERR)) {
1377                         dd->err_info_rcvport.packet_flit1 = flits[0];
1378                         dd->err_info_rcvport.packet_flit2 =
1379                                 packet->tlen > sizeof(flits[0]) ? flits[1] : 0;
1380                 }
1381                 dd->err_info_rcvport.status_and_code |=
1382                         (OPA_EI_STATUS_SMASK | BAD_L2_ERR);
1383         }
1384         return RHF_RCV_CONTINUE;
1385 }
1386
1387 int process_receive_error(struct hfi1_packet *packet)
1388 {
1389         handle_eflags(packet);
1390
1391         if (unlikely(rhf_err_flags(packet->rhf)))
1392                 dd_dev_err(packet->rcd->dd,
1393                            "Unhandled error packet received. Dropping.\n");
1394
1395         return RHF_RCV_CONTINUE;
1396 }
1397
1398 int kdeth_process_expected(struct hfi1_packet *packet)
1399 {
1400         if (unlikely(rhf_err_flags(packet->rhf)))
1401                 handle_eflags(packet);
1402
1403         dd_dev_err(packet->rcd->dd,
1404                    "Unhandled expected packet received. Dropping.\n");
1405         return RHF_RCV_CONTINUE;
1406 }
1407
1408 int kdeth_process_eager(struct hfi1_packet *packet)
1409 {
1410         if (unlikely(rhf_err_flags(packet->rhf)))
1411                 handle_eflags(packet);
1412
1413         dd_dev_err(packet->rcd->dd,
1414                    "Unhandled eager packet received. Dropping.\n");
1415         return RHF_RCV_CONTINUE;
1416 }
1417
1418 int process_receive_invalid(struct hfi1_packet *packet)
1419 {
1420         dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1421                    rhf_rcv_type(packet->rhf));
1422         return RHF_RCV_CONTINUE;
1423 }