drivers/staging/rdma/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 hfi1_message_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 hfi1_ib_header *hdr = (struct hfi1_ib_header *)rhdr;
 292                 struct hfi1_other_headers *ohdr = NULL;
 293                 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 294                 u16 lid  = be16_to_cpu(hdr->lrh[1]);
 295                 u32 qp_num;
 296                 u32 rcv_flags = 0;
 297
 298                 /* Sanity check packet */
 299                 if (tlen < 24)
 300                         goto drop;
 301
 302                 /* Check for GRH */
 303                 if (lnh == HFI1_LRH_BTH) {
 304                         ohdr = &hdr->u.oth;
 305                 } else if (lnh == HFI1_LRH_GRH) {
 306                         u32 vtf;
 307
 308                         ohdr = &hdr->u.l.oth;
 309                         if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
 310                                 goto drop;
 311                         vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow);
 312                         if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
 313                                 goto drop;
 314                         rcv_flags |= HFI1_HAS_GRH;
 315                 } else {
 316                         goto drop;
 317                 }
 318                 /* Get the destination QP number. */
 319                 qp_num = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;
 320                 if (lid < be16_to_cpu(IB_MULTICAST_LID_BASE)) {
 321                         struct rvt_qp *qp;
 322                         unsigned long flags;
 323
 324                         rcu_read_lock();
 325                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
 326                         if (!qp) {
 327                                 rcu_read_unlock();
 328                                 goto drop;
 329                         }
 330
 331                         /*
 332                          * Handle only RC QPs - for other QP types drop error
 333                          * packet.
 334                          */
 335                         spin_lock_irqsave(&qp->r_lock, flags);
 336
 337                         /* Check for valid receive state. */
 338                         if (!(ib_rvt_state_ops[qp->state] &
 339                               RVT_PROCESS_RECV_OK)) {
 340                                 ibp->rvp.n_pkt_drops++;
 341                         }
 342
 343                         switch (qp->ibqp.qp_type) {
 344                         case IB_QPT_RC:
 345                                 hfi1_rc_hdrerr(
 346                                         rcd,
 347                                         hdr,
 348                                         rcv_flags,
 349                                         qp);
 350                                 break;
 351                         default:
 352                                 /* For now don't handle any other QP types */
 353                                 break;
 354                         }
 355
 356                         spin_unlock_irqrestore(&qp->r_lock, flags);
 357                         rcu_read_unlock();
 358                 } /* Unicast QP */
 359         } /* Valid packet with TIDErr */
 360
 361         /* handle "RcvTypeErr" flags */
 362         switch (rte) {
 363         case RHF_RTE_ERROR_OP_CODE_ERR:
 364         {
 365                 u32 opcode;
 366                 void *ebuf = NULL;
 367                 __be32 *bth = NULL;
 368
 369                 if (rhf_use_egr_bfr(packet->rhf))
 370                         ebuf = packet->ebuf;
 371
 372                 if (!ebuf)
 373                         goto drop; /* this should never happen */
 374
 375                 if (lnh == HFI1_LRH_BTH)
 376                         bth = (__be32 *)ebuf;
 377                 else if (lnh == HFI1_LRH_GRH)
 378                         bth = (__be32 *)((char *)ebuf + sizeof(struct ib_grh));
 379                 else
 380                         goto drop;
 381
 382                 opcode = be32_to_cpu(bth[0]) >> 24;
 383                 opcode &= 0xff;
 384
 385                 if (opcode == IB_OPCODE_CNP) {
 386                         /*
 387                          * Only in pre-B0 h/w is the CNP_OPCODE handled
 388                          * via this code path.
 389                          */
 390                         struct rvt_qp *qp = NULL;
 391                         u32 lqpn, rqpn;
 392                         u16 rlid;
 393                         u8 svc_type, sl, sc5;
 394
 395                         sc5  = (be16_to_cpu(rhdr->lrh[0]) >> 12) & 0xf;
 396                         if (rhf_dc_info(packet->rhf))
 397                                 sc5 |= 0x10;
 398                         sl = ibp->sc_to_sl[sc5];
 399
 400                         lqpn = be32_to_cpu(bth[1]) & RVT_QPN_MASK;
 401                         rcu_read_lock();
 402                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
 403                         if (!qp) {
 404                                 rcu_read_unlock();
 405                                 goto drop;
 406                         }
 407
 408                         switch (qp->ibqp.qp_type) {
 409                         case IB_QPT_UD:
 410                                 rlid = 0;
 411                                 rqpn = 0;
 412                                 svc_type = IB_CC_SVCTYPE_UD;
 413                                 break;
 414                         case IB_QPT_UC:
 415                                 rlid = be16_to_cpu(rhdr->lrh[3]);
 416                                 rqpn = qp->remote_qpn;
 417                                 svc_type = IB_CC_SVCTYPE_UC;
 418                                 break;
 419                         default:
 420                                 goto drop;
 421                         }
 422
 423                         process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 424                         rcu_read_unlock();
 425                 }
 426
 427                 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
 428                 break;
 429         }
 430         default:
 431                 break;
 432         }
 433
 434 drop:
 435         return;
 436 }
 437
 438 static inline void init_packet(struct hfi1_ctxtdata *rcd,
 439                                struct hfi1_packet *packet)
 440 {
 441         packet->rsize = rcd->rcvhdrqentsize; /* words */
 442         packet->maxcnt = rcd->rcvhdrq_cnt * packet->rsize; /* words */
 443         packet->rcd = rcd;
 444         packet->updegr = 0;
 445         packet->etail = -1;
 446         packet->rhf_addr = get_rhf_addr(rcd);
 447         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 448         packet->rhqoff = rcd->head;
 449         packet->numpkt = 0;
 450         packet->rcv_flags = 0;
 451 }
 452
 453 static void process_ecn(struct rvt_qp *qp, struct hfi1_ib_header *hdr,
 454                         struct hfi1_other_headers *ohdr,
 455                         u64 rhf, u32 bth1, struct ib_grh *grh)
 456 {
 457         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 458         u32 rqpn = 0;
 459         u16 rlid;
 460         u8 sc5, svc_type;
 461
 462         switch (qp->ibqp.qp_type) {
 463         case IB_QPT_SMI:
 464         case IB_QPT_GSI:
 465         case IB_QPT_UD:
 466                 rlid = be16_to_cpu(hdr->lrh[3]);
 467                 rqpn = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;
 468                 svc_type = IB_CC_SVCTYPE_UD;
 469                 break;
 470         case IB_QPT_UC:
 471                 rlid = qp->remote_ah_attr.dlid;
 472                 rqpn = qp->remote_qpn;
 473                 svc_type = IB_CC_SVCTYPE_UC;
 474                 break;
 475         case IB_QPT_RC:
 476                 rlid = qp->remote_ah_attr.dlid;
 477                 rqpn = qp->remote_qpn;
 478                 svc_type = IB_CC_SVCTYPE_RC;
 479                 break;
 480         default:
 481                 return;
 482         }
 483
 484         sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf;
 485         if (rhf_dc_info(rhf))
 486                 sc5 |= 0x10;
 487
 488         if (bth1 & HFI1_FECN_SMASK) {
 489                 u16 pkey = (u16)be32_to_cpu(ohdr->bth[0]);
 490                 u16 dlid = be16_to_cpu(hdr->lrh[1]);
 491
 492                 return_cnp(ibp, qp, rqpn, pkey, dlid, rlid, sc5, grh);
 493         }
 494
 495         if (bth1 & HFI1_BECN_SMASK) {
 496                 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 497                 u32 lqpn = bth1 & RVT_QPN_MASK;
 498                 u8 sl = ibp->sc_to_sl[sc5];
 499
 500                 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 501         }
 502 }
 503
 504 struct ps_mdata {
 505         struct hfi1_ctxtdata *rcd;
 506         u32 rsize;
 507         u32 maxcnt;
 508         u32 ps_head;
 509         u32 ps_tail;
 510         u32 ps_seq;
 511 };
 512
 513 static inline void init_ps_mdata(struct ps_mdata *mdata,
 514                                  struct hfi1_packet *packet)
 515 {
 516         struct hfi1_ctxtdata *rcd = packet->rcd;
 517
 518         mdata->rcd = rcd;
 519         mdata->rsize = packet->rsize;
 520         mdata->maxcnt = packet->maxcnt;
 521         mdata->ps_head = packet->rhqoff;
 522
 523         if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 524                 mdata->ps_tail = get_rcvhdrtail(rcd);
 525                 if (rcd->ctxt == HFI1_CTRL_CTXT)
 526                         mdata->ps_seq = rcd->seq_cnt;
 527                 else
 528                         mdata->ps_seq = 0; /* not used with DMA_RTAIL */
 529         } else {
 530                 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
 531                 mdata->ps_seq = rcd->seq_cnt;
 532         }
 533 }
 534
 535 static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
 536                           struct hfi1_ctxtdata *rcd)
 537 {
 538         if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL))
 539                 return mdata->ps_head == mdata->ps_tail;
 540         return mdata->ps_seq != rhf_rcv_seq(rhf);
 541 }
 542
 543 static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
 544                           struct hfi1_ctxtdata *rcd)
 545 {
 546         /*
 547          * Control context can potentially receive an invalid rhf.
 548          * Drop such packets.
 549          */
 550         if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
 551                 return mdata->ps_seq != rhf_rcv_seq(rhf);
 552
 553         return 0;
 554 }
 555
 556 static inline void update_ps_mdata(struct ps_mdata *mdata,
 557                                    struct hfi1_ctxtdata *rcd)
 558 {
 559         mdata->ps_head += mdata->rsize;
 560         if (mdata->ps_head >= mdata->maxcnt)
 561                 mdata->ps_head = 0;
 562
 563         /* Control context must do seq counting */
 564         if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ||
 565             (rcd->ctxt == HFI1_CTRL_CTXT)) {
 566                 if (++mdata->ps_seq > 13)
 567                         mdata->ps_seq = 1;
 568         }
 569 }
 570
 571 /*
 572  * prescan_rxq - search through the receive queue looking for packets
 573  * containing Excplicit Congestion Notifications (FECNs, or BECNs).
 574  * When an ECN is found, process the Congestion Notification, and toggle
 575  * it off.
 576  * This is declared as a macro to allow quick checking of the port to avoid
 577  * the overhead of a function call if not enabled.
 578  */
 579 #define prescan_rxq(rcd, packet) \
 580         do { \
 581                 if (rcd->ppd->cc_prescan) \
 582                         __prescan_rxq(packet); \
 583         } while (0)
 584 static void __prescan_rxq(struct hfi1_packet *packet)
 585 {
 586         struct hfi1_ctxtdata *rcd = packet->rcd;
 587         struct ps_mdata mdata;
 588
 589         init_ps_mdata(&mdata, packet);
 590
 591         while (1) {
 592                 struct hfi1_devdata *dd = rcd->dd;
 593                 struct hfi1_ibport *ibp = &rcd->ppd->ibport_data;
 594                 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
 595                                          dd->rhf_offset;
 596                 struct rvt_qp *qp;
 597                 struct hfi1_ib_header *hdr;
 598                 struct hfi1_other_headers *ohdr;
 599                 struct ib_grh *grh = NULL;
 600                 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
 601                 u64 rhf = rhf_to_cpu(rhf_addr);
 602                 u32 etype = rhf_rcv_type(rhf), qpn, bth1;
 603                 int is_ecn = 0;
 604                 u8 lnh;
 605
 606                 if (ps_done(&mdata, rhf, rcd))
 607                         break;
 608
 609                 if (ps_skip(&mdata, rhf, rcd))
 610                         goto next;
 611
 612                 if (etype != RHF_RCV_TYPE_IB)
 613                         goto next;
 614
 615                 hdr = (struct hfi1_ib_header *)
 616                         hfi1_get_msgheader(dd, rhf_addr);
 617                 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
 618
 619                 if (lnh == HFI1_LRH_BTH) {
 620                         ohdr = &hdr->u.oth;
 621                 } else if (lnh == HFI1_LRH_GRH) {
 622                         ohdr = &hdr->u.l.oth;
 623                         grh = &hdr->u.l.grh;
 624                 } else {
 625                         goto next; /* just in case */
 626                 }
 627                 bth1 = be32_to_cpu(ohdr->bth[1]);
 628                 is_ecn = !!(bth1 & (HFI1_FECN_SMASK | HFI1_BECN_SMASK));
 629
 630                 if (!is_ecn)
 631                         goto next;
 632
 633                 qpn = bth1 & RVT_QPN_MASK;
 634                 rcu_read_lock();
 635                 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
 636
 637                 if (!qp) {
 638                         rcu_read_unlock();
 639                         goto next;
 640                 }
 641
 642                 process_ecn(qp, hdr, ohdr, rhf, bth1, grh);
 643                 rcu_read_unlock();
 644
 645                 /* turn off BECN, FECN */
 646                 bth1 &= ~(HFI1_FECN_SMASK | HFI1_BECN_SMASK);
 647                 ohdr->bth[1] = cpu_to_be32(bth1);
 648 next:
 649                 update_ps_mdata(&mdata, rcd);
 650         }
 651 }
 652
 653 static inline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
 654 {
 655         int ret = RCV_PKT_OK;
 656
 657         /* Set up for the next packet */
 658         packet->rhqoff += packet->rsize;
 659         if (packet->rhqoff >= packet->maxcnt)
 660                 packet->rhqoff = 0;
 661
 662         packet->numpkt++;
 663         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) {
 664                 if (thread) {
 665                         cond_resched();
 666                 } else {
 667                         ret = RCV_PKT_LIMIT;
 668                         this_cpu_inc(*packet->rcd->dd->rcv_limit);
 669                 }
 670         }
 671
 672         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 673                                      packet->rcd->dd->rhf_offset;
 674         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 675
 676         return ret;
 677 }
 678
 679 static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
 680 {
 681         int ret = RCV_PKT_OK;
 682
 683         packet->hdr = hfi1_get_msgheader(packet->rcd->dd,
 684                                          packet->rhf_addr);
 685         packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
 686         packet->etype = rhf_rcv_type(packet->rhf);
 687         /* total length */
 688         packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 689         /* retrieve eager buffer details */
 690         packet->ebuf = NULL;
 691         if (rhf_use_egr_bfr(packet->rhf)) {
 692                 packet->etail = rhf_egr_index(packet->rhf);
 693                 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
 694                                  &packet->updegr);
 695                 /*
 696                  * Prefetch the contents of the eager buffer.  It is
 697                  * OK to send a negative length to prefetch_range().
 698                  * The +2 is the size of the RHF.
 699                  */
 700                 prefetch_range(packet->ebuf,
 701                                packet->tlen - ((packet->rcd->rcvhdrqentsize -
 702                                                (rhf_hdrq_offset(packet->rhf)
 703                                                 + 2)) * 4));
 704         }
 705
 706         /*
 707          * Call a type specific handler for the packet. We
 708          * should be able to trust that etype won't be beyond
 709          * the range of valid indexes. If so something is really
 710          * wrong and we can probably just let things come
 711          * crashing down. There is no need to eat another
 712          * comparison in this performance critical code.
 713          */
 714         packet->rcd->dd->rhf_rcv_function_map[packet->etype](packet);
 715         packet->numpkt++;
 716
 717         /* Set up for the next packet */
 718         packet->rhqoff += packet->rsize;
 719         if (packet->rhqoff >= packet->maxcnt)
 720                 packet->rhqoff = 0;
 721
 722         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) {
 723                 if (thread) {
 724                         cond_resched();
 725                 } else {
 726                         ret = RCV_PKT_LIMIT;
 727                         this_cpu_inc(*packet->rcd->dd->rcv_limit);
 728                 }
 729         }
 730
 731         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 732                                       packet->rcd->dd->rhf_offset;
 733         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 734
 735         return ret;
 736 }
 737
 738 static inline void process_rcv_update(int last, struct hfi1_packet *packet)
 739 {
 740         /*
 741          * Update head regs etc., every 16 packets, if not last pkt,
 742          * to help prevent rcvhdrq overflows, when many packets
 743          * are processed and queue is nearly full.
 744          * Don't request an interrupt for intermediate updates.
 745          */
 746         if (!last && !(packet->numpkt & 0xf)) {
 747                 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
 748                                packet->etail, 0, 0);
 749                 packet->updegr = 0;
 750         }
 751         packet->rcv_flags = 0;
 752 }
 753
 754 static inline void finish_packet(struct hfi1_packet *packet)
 755 {
 756         /*
 757          * Nothing we need to free for the packet.
 758          *
 759          * The only thing we need to do is a final update and call for an
 760          * interrupt
 761          */
 762         update_usrhead(packet->rcd, packet->rcd->head, packet->updegr,
 763                        packet->etail, rcv_intr_dynamic, packet->numpkt);
 764 }
 765
 766 static inline void process_rcv_qp_work(struct hfi1_packet *packet)
 767 {
 768         struct hfi1_ctxtdata *rcd;
 769         struct rvt_qp *qp, *nqp;
 770
 771         rcd = packet->rcd;
 772         rcd->head = packet->rhqoff;
 773
 774         /*
 775          * Iterate over all QPs waiting to respond.
 776          * The list won't change since the IRQ is only run on one CPU.
 777          */
 778         list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
 779                 list_del_init(&qp->rspwait);
 780                 if (qp->r_flags & RVT_R_RSP_NAK) {
 781                         qp->r_flags &= ~RVT_R_RSP_NAK;
 782                         hfi1_send_rc_ack(rcd, qp, 0);
 783                 }
 784                 if (qp->r_flags & RVT_R_RSP_SEND) {
 785                         unsigned long flags;
 786
 787                         qp->r_flags &= ~RVT_R_RSP_SEND;
 788                         spin_lock_irqsave(&qp->s_lock, flags);
 789                         if (ib_rvt_state_ops[qp->state] &
 790                                         RVT_PROCESS_OR_FLUSH_SEND)
 791                                 hfi1_schedule_send(qp);
 792                         spin_unlock_irqrestore(&qp->s_lock, flags);
 793                 }
 794                 if (atomic_dec_and_test(&qp->refcount))
 795                         wake_up(&qp->wait);
 796         }
 797 }
 798
 799 /*
 800  * Handle receive interrupts when using the no dma rtail option.
 801  */
 802 int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 803 {
 804         u32 seq;
 805         int last = RCV_PKT_OK;
 806         struct hfi1_packet packet;
 807
 808         init_packet(rcd, &packet);
 809         seq = rhf_rcv_seq(packet.rhf);
 810         if (seq != rcd->seq_cnt) {
 811                 last = RCV_PKT_DONE;
 812                 goto bail;
 813         }
 814
 815         prescan_rxq(rcd, &packet);
 816
 817         while (last == RCV_PKT_OK) {
 818                 last = process_rcv_packet(&packet, thread);
 819                 seq = rhf_rcv_seq(packet.rhf);
 820                 if (++rcd->seq_cnt > 13)
 821                         rcd->seq_cnt = 1;
 822                 if (seq != rcd->seq_cnt)
 823                         last = RCV_PKT_DONE;
 824                 process_rcv_update(last, &packet);
 825         }
 826         process_rcv_qp_work(&packet);
 827 bail:
 828         finish_packet(&packet);
 829         return last;
 830 }
 831
 832 int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 833 {
 834         u32 hdrqtail;
 835         int last = RCV_PKT_OK;
 836         struct hfi1_packet packet;
 837
 838         init_packet(rcd, &packet);
 839         hdrqtail = get_rcvhdrtail(rcd);
 840         if (packet.rhqoff == hdrqtail) {
 841                 last = RCV_PKT_DONE;
 842                 goto bail;
 843         }
 844         smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 845
 846         prescan_rxq(rcd, &packet);
 847
 848         while (last == RCV_PKT_OK) {
 849                 last = process_rcv_packet(&packet, thread);
 850                 if (packet.rhqoff == hdrqtail)
 851                         last = RCV_PKT_DONE;
 852                 process_rcv_update(last, &packet);
 853         }
 854         process_rcv_qp_work(&packet);
 855 bail:
 856         finish_packet(&packet);
 857         return last;
 858 }
 859
 860 static inline void set_all_nodma_rtail(struct hfi1_devdata *dd)
 861 {
 862         int i;
 863
 864         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 865                 dd->rcd[i]->do_interrupt =
 866                         &handle_receive_interrupt_nodma_rtail;
 867 }
 868
 869 static inline void set_all_dma_rtail(struct hfi1_devdata *dd)
 870 {
 871         int i;
 872
 873         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 874                 dd->rcd[i]->do_interrupt =
 875                         &handle_receive_interrupt_dma_rtail;
 876 }
 877
 878 void set_all_slowpath(struct hfi1_devdata *dd)
 879 {
 880         int i;
 881
 882         /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
 883         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 884                 dd->rcd[i]->do_interrupt = &handle_receive_interrupt;
 885 }
 886
 887 static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd,
 888                                       struct hfi1_packet packet,
 889                                       struct hfi1_devdata *dd)
 890 {
 891         struct work_struct *lsaw = &rcd->ppd->linkstate_active_work;
 892         struct hfi1_message_header *hdr = hfi1_get_msgheader(packet.rcd->dd,
 893                                                              packet.rhf_addr);
 894
 895         if (hdr2sc(hdr, packet.rhf) != 0xf) {
 896                 int hwstate = read_logical_state(dd);
 897
 898                 if (hwstate != LSTATE_ACTIVE) {
 899                         dd_dev_info(dd, "Unexpected link state %d\n", hwstate);
 900                         return 0;
 901                 }
 902
 903                 queue_work(rcd->ppd->hfi1_wq, lsaw);
 904                 return 1;
 905         }
 906         return 0;
 907 }
 908
 909 /*
 910  * handle_receive_interrupt - receive a packet
 911  * @rcd: the context
 912  *
 913  * Called from interrupt handler for errors or receive interrupt.
 914  * This is the slow path interrupt handler.
 915  */
 916 int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
 917 {
 918         struct hfi1_devdata *dd = rcd->dd;
 919         u32 hdrqtail;
 920         int needset, last = RCV_PKT_OK;
 921         struct hfi1_packet packet;
 922         int skip_pkt = 0;
 923
 924         /* Control context will always use the slow path interrupt handler */
 925         needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
 926
 927         init_packet(rcd, &packet);
 928
 929         if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 930                 u32 seq = rhf_rcv_seq(packet.rhf);
 931
 932                 if (seq != rcd->seq_cnt) {
 933                         last = RCV_PKT_DONE;
 934                         goto bail;
 935                 }
 936                 hdrqtail = 0;
 937         } else {
 938                 hdrqtail = get_rcvhdrtail(rcd);
 939                 if (packet.rhqoff == hdrqtail) {
 940                         last = RCV_PKT_DONE;
 941                         goto bail;
 942                 }
 943                 smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 944
 945                 /*
 946                  * Control context can potentially receive an invalid
 947                  * rhf. Drop such packets.
 948                  */
 949                 if (rcd->ctxt == HFI1_CTRL_CTXT) {
 950                         u32 seq = rhf_rcv_seq(packet.rhf);
 951
 952                         if (seq != rcd->seq_cnt)
 953                                 skip_pkt = 1;
 954                 }
 955         }
 956
 957         prescan_rxq(rcd, &packet);
 958
 959         while (last == RCV_PKT_OK) {
 960                 if (unlikely(dd->do_drop &&
 961                              atomic_xchg(&dd->drop_packet, DROP_PACKET_OFF) ==
 962                              DROP_PACKET_ON)) {
 963                         dd->do_drop = 0;
 964
 965                         /* On to the next packet */
 966                         packet.rhqoff += packet.rsize;
 967                         packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
 968                                           packet.rhqoff +
 969                                           dd->rhf_offset;
 970                         packet.rhf = rhf_to_cpu(packet.rhf_addr);
 971
 972                 } else if (skip_pkt) {
 973                         last = skip_rcv_packet(&packet, thread);
 974                         skip_pkt = 0;
 975                 } else {
 976                         /* Auto activate link on non-SC15 packet receive */
 977                         if (unlikely(rcd->ppd->host_link_state ==
 978                                      HLS_UP_ARMED) &&
 979                             set_armed_to_active(rcd, packet, dd))
 980                                 goto bail;
 981                         last = process_rcv_packet(&packet, thread);
 982                 }
 983
 984                 if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 985                         u32 seq = rhf_rcv_seq(packet.rhf);
 986
 987                         if (++rcd->seq_cnt > 13)
 988                                 rcd->seq_cnt = 1;
 989                         if (seq != rcd->seq_cnt)
 990                                 last = RCV_PKT_DONE;
 991                         if (needset) {
 992                                 dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n");
 993                                 set_all_nodma_rtail(dd);
 994                                 needset = 0;
 995                         }
 996                 } else {
 997                         if (packet.rhqoff == hdrqtail)
 998                                 last = RCV_PKT_DONE;
 999                         /*
1000                          * Control context can potentially receive an invalid
1001                          * rhf. Drop such packets.
1002                          */
1003                         if (rcd->ctxt == HFI1_CTRL_CTXT) {
1004                                 u32 seq = rhf_rcv_seq(packet.rhf);
1005
1006                                 if (++rcd->seq_cnt > 13)
1007                                         rcd->seq_cnt = 1;
1008                                 if (!last && (seq != rcd->seq_cnt))
1009                                         skip_pkt = 1;
1010                         }
1011
1012                         if (needset) {
1013                                 dd_dev_info(dd,
1014                                             "Switching to DMA_RTAIL\n");
1015                                 set_all_dma_rtail(dd);
1016                                 needset = 0;
1017                         }
1018                 }
1019
1020                 process_rcv_update(last, &packet);
1021         }
1022
1023         process_rcv_qp_work(&packet);
1024
1025 bail:
1026         /*
1027          * Always write head at end, and setup rcv interrupt, even
1028          * if no packets were processed.
1029          */
1030         finish_packet(&packet);
1031         return last;
1032 }
1033
1034 /*
1035  * We may discover in the interrupt that the hardware link state has
1036  * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1037  * and we need to update the driver's notion of the link state.  We cannot
1038  * run set_link_state from interrupt context, so we queue this function on
1039  * a workqueue.
1040  *
1041  * We delay the regular interrupt processing until after the state changes
1042  * so that the link will be in the correct state by the time any application
1043  * we wake up attempts to send a reply to any message it received.
1044  * (Subsequent receive interrupts may possibly force the wakeup before we
1045  * update the link state.)
1046  *
1047  * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1048  * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1049  * so we're safe from use-after-free of the rcd.
1050  */
1051 void receive_interrupt_work(struct work_struct *work)
1052 {
1053         struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1054                                                   linkstate_active_work);
1055         struct hfi1_devdata *dd = ppd->dd;
1056         int i;
1057
1058         /* Received non-SC15 packet implies neighbor_normal */
1059         ppd->neighbor_normal = 1;
1060         set_link_state(ppd, HLS_UP_ACTIVE);
1061
1062         /*
1063          * Interrupt all kernel contexts that could have had an
1064          * interrupt during auto activation.
1065          */
1066         for (i = HFI1_CTRL_CTXT; i < dd->first_user_ctxt; i++)
1067                 force_recv_intr(dd->rcd[i]);
1068 }
1069
1070 /*
1071  * Convert a given MTU size to the on-wire MAD packet enumeration.
1072  * Return -1 if the size is invalid.
1073  */
1074 int mtu_to_enum(u32 mtu, int default_if_bad)
1075 {
1076         switch (mtu) {
1077         case     0: return OPA_MTU_0;
1078         case   256: return OPA_MTU_256;
1079         case   512: return OPA_MTU_512;
1080         case  1024: return OPA_MTU_1024;
1081         case  2048: return OPA_MTU_2048;
1082         case  4096: return OPA_MTU_4096;
1083         case  8192: return OPA_MTU_8192;
1084         case 10240: return OPA_MTU_10240;
1085         }
1086         return default_if_bad;
1087 }
1088
1089 u16 enum_to_mtu(int mtu)
1090 {
1091         switch (mtu) {
1092         case OPA_MTU_0:     return 0;
1093         case OPA_MTU_256:   return 256;
1094         case OPA_MTU_512:   return 512;
1095         case OPA_MTU_1024:  return 1024;
1096         case OPA_MTU_2048:  return 2048;
1097         case OPA_MTU_4096:  return 4096;
1098         case OPA_MTU_8192:  return 8192;
1099         case OPA_MTU_10240: return 10240;
1100         default: return 0xffff;
1101         }
1102 }
1103
1104 /*
1105  * set_mtu - set the MTU
1106  * @ppd: the per port data
1107  *
1108  * We can handle "any" incoming size, the issue here is whether we
1109  * need to restrict our outgoing size.  We do not deal with what happens
1110  * to programs that are already running when the size changes.
1111  */
1112 int set_mtu(struct hfi1_pportdata *ppd)
1113 {
1114         struct hfi1_devdata *dd = ppd->dd;
1115         int i, drain, ret = 0, is_up = 0;
1116
1117         ppd->ibmtu = 0;
1118         for (i = 0; i < ppd->vls_supported; i++)
1119                 if (ppd->ibmtu < dd->vld[i].mtu)
1120                         ppd->ibmtu = dd->vld[i].mtu;
1121         ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
1122
1123         mutex_lock(&ppd->hls_lock);
1124         if (ppd->host_link_state == HLS_UP_INIT ||
1125             ppd->host_link_state == HLS_UP_ARMED ||
1126             ppd->host_link_state == HLS_UP_ACTIVE)
1127                 is_up = 1;
1128
1129         drain = !is_ax(dd) && is_up;
1130
1131         if (drain)
1132                 /*
1133                  * MTU is specified per-VL. To ensure that no packet gets
1134                  * stuck (due, e.g., to the MTU for the packet's VL being
1135                  * reduced), empty the per-VL FIFOs before adjusting MTU.
1136                  */
1137                 ret = stop_drain_data_vls(dd);
1138
1139         if (ret) {
1140                 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1141                            __func__);
1142                 goto err;
1143         }
1144
1145         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
1146
1147         if (drain)
1148                 open_fill_data_vls(dd); /* reopen all VLs */
1149
1150 err:
1151         mutex_unlock(&ppd->hls_lock);
1152
1153         return ret;
1154 }
1155
1156 int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1157 {
1158         struct hfi1_devdata *dd = ppd->dd;
1159
1160         ppd->lid = lid;
1161         ppd->lmc = lmc;
1162         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
1163
1164         dd_dev_info(dd, "IB%u:%u got a lid: 0x%x\n", dd->unit, ppd->port, lid);
1165
1166         return 0;
1167 }
1168
1169 void shutdown_led_override(struct hfi1_pportdata *ppd)
1170 {
1171         struct hfi1_devdata *dd = ppd->dd;
1172
1173         /*
1174          * This pairs with the memory barrier in hfi1_start_led_override to
1175          * ensure that we read the correct state of LED beaconing represented
1176          * by led_override_timer_active
1177          */
1178         smp_rmb();
1179         if (atomic_read(&ppd->led_override_timer_active)) {
1180                 del_timer_sync(&ppd->led_override_timer);
1181                 atomic_set(&ppd->led_override_timer_active, 0);
1182                 /* Ensure the atomic_set is visible to all CPUs */
1183                 smp_wmb();
1184         }
1185
1186         /* Hand control of the LED to the DC for normal operation */
1187         write_csr(dd, DCC_CFG_LED_CNTRL, 0);
1188 }
1189
1190 static void run_led_override(unsigned long opaque)
1191 {
1192         struct hfi1_pportdata *ppd = (struct hfi1_pportdata *)opaque;
1193         struct hfi1_devdata *dd = ppd->dd;
1194         unsigned long timeout;
1195         int phase_idx;
1196
1197         if (!(dd->flags & HFI1_INITTED))
1198                 return;
1199
1200         phase_idx = ppd->led_override_phase & 1;
1201
1202         setextled(dd, phase_idx);
1203
1204         timeout = ppd->led_override_vals[phase_idx];
1205
1206         /* Set up for next phase */
1207         ppd->led_override_phase = !ppd->led_override_phase;
1208
1209         mod_timer(&ppd->led_override_timer, jiffies + timeout);
1210 }
1211
1212 /*
1213  * To have the LED blink in a particular pattern, provide timeon and timeoff
1214  * in milliseconds.
1215  * To turn off custom blinking and return to normal operation, use
1216  * shutdown_led_override()
1217  */
1218 void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1219                              unsigned int timeoff)
1220 {
1221         if (!(ppd->dd->flags & HFI1_INITTED))
1222                 return;
1223
1224         /* Convert to jiffies for direct use in timer */
1225         ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
1226         ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
1227
1228         /* Arbitrarily start from LED on phase */
1229         ppd->led_override_phase = 1;
1230
1231         /*
1232          * If the timer has not already been started, do so. Use a "quick"
1233          * timeout so the handler will be called soon to look at our request.
1234          */
1235         if (!timer_pending(&ppd->led_override_timer)) {
1236                 setup_timer(&ppd->led_override_timer, run_led_override,
1237                             (unsigned long)ppd);
1238                 ppd->led_override_timer.expires = jiffies + 1;
1239                 add_timer(&ppd->led_override_timer);
1240                 atomic_set(&ppd->led_override_timer_active, 1);
1241                 /* Ensure the atomic_set is visible to all CPUs */
1242                 smp_wmb();
1243         }
1244 }
1245
1246 /**
1247  * hfi1_reset_device - reset the chip if possible
1248  * @unit: the device to reset
1249  *
1250  * Whether or not reset is successful, we attempt to re-initialize the chip
1251  * (that is, much like a driver unload/reload).  We clear the INITTED flag
1252  * so that the various entry points will fail until we reinitialize.  For
1253  * now, we only allow this if no user contexts are open that use chip resources
1254  */
1255 int hfi1_reset_device(int unit)
1256 {
1257         int ret, i;
1258         struct hfi1_devdata *dd = hfi1_lookup(unit);
1259         struct hfi1_pportdata *ppd;
1260         unsigned long flags;
1261         int pidx;
1262
1263         if (!dd) {
1264                 ret = -ENODEV;
1265                 goto bail;
1266         }
1267
1268         dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1269
1270         if (!dd->kregbase || !(dd->flags & HFI1_PRESENT)) {
1271                 dd_dev_info(dd,
1272                             "Invalid unit number %u or not initialized or not present\n",
1273                             unit);
1274                 ret = -ENXIO;
1275                 goto bail;
1276         }
1277
1278         spin_lock_irqsave(&dd->uctxt_lock, flags);
1279         if (dd->rcd)
1280                 for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) {
1281                         if (!dd->rcd[i] || !dd->rcd[i]->cnt)
1282                                 continue;
1283                         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1284                         ret = -EBUSY;
1285                         goto bail;
1286                 }
1287         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1288
1289         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1290                 ppd = dd->pport + pidx;
1291
1292                 shutdown_led_override(ppd);
1293         }
1294         if (dd->flags & HFI1_HAS_SEND_DMA)
1295                 sdma_exit(dd);
1296
1297         hfi1_reset_cpu_counters(dd);
1298
1299         ret = hfi1_init(dd, 1);
1300
1301         if (ret)
1302                 dd_dev_err(dd,
1303                            "Reinitialize unit %u after reset failed with %d\n",
1304                            unit, ret);
1305         else
1306                 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1307                             unit);
1308
1309 bail:
1310         return ret;
1311 }
1312
1313 void handle_eflags(struct hfi1_packet *packet)
1314 {
1315         struct hfi1_ctxtdata *rcd = packet->rcd;
1316         u32 rte = rhf_rcv_type_err(packet->rhf);
1317
1318         rcv_hdrerr(rcd, rcd->ppd, packet);
1319         if (rhf_err_flags(packet->rhf))
1320                 dd_dev_err(rcd->dd,
1321                            "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s%s] rte 0x%x\n",
1322                            rcd->ctxt, packet->rhf,
1323                            packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1324                            packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1325                            packet->rhf & RHF_DC_ERR ? "dc " : "",
1326                            packet->rhf & RHF_TID_ERR ? "tid " : "",
1327                            packet->rhf & RHF_LEN_ERR ? "len " : "",
1328                            packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1329                            packet->rhf & RHF_VCRC_ERR ? "vcrc " : "",
1330                            packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1331                            rte);
1332 }
1333
1334 /*
1335  * The following functions are called by the interrupt handler. They are type
1336  * specific handlers for each packet type.
1337  */
1338 int process_receive_ib(struct hfi1_packet *packet)
1339 {
1340         trace_hfi1_rcvhdr(packet->rcd->ppd->dd,
1341                           packet->rcd->ctxt,
1342                           rhf_err_flags(packet->rhf),
1343                           RHF_RCV_TYPE_IB,
1344                           packet->hlen,
1345                           packet->tlen,
1346                           packet->updegr,
1347                           rhf_egr_index(packet->rhf));
1348
1349         if (unlikely(rhf_err_flags(packet->rhf))) {
1350                 handle_eflags(packet);
1351                 return RHF_RCV_CONTINUE;
1352         }
1353
1354         hfi1_ib_rcv(packet);
1355         return RHF_RCV_CONTINUE;
1356 }
1357
1358 int process_receive_bypass(struct hfi1_packet *packet)
1359 {
1360         if (unlikely(rhf_err_flags(packet->rhf)))
1361                 handle_eflags(packet);
1362
1363         dd_dev_err(packet->rcd->dd,
1364                    "Bypass packets are not supported in normal operation. Dropping\n");
1365         return RHF_RCV_CONTINUE;
1366 }
1367
1368 int process_receive_error(struct hfi1_packet *packet)
1369 {
1370         handle_eflags(packet);
1371
1372         if (unlikely(rhf_err_flags(packet->rhf)))
1373                 dd_dev_err(packet->rcd->dd,
1374                            "Unhandled error packet received. Dropping.\n");
1375
1376         return RHF_RCV_CONTINUE;
1377 }
1378
1379 int kdeth_process_expected(struct hfi1_packet *packet)
1380 {
1381         if (unlikely(rhf_err_flags(packet->rhf)))
1382                 handle_eflags(packet);
1383
1384         dd_dev_err(packet->rcd->dd,
1385                    "Unhandled expected packet received. Dropping.\n");
1386         return RHF_RCV_CONTINUE;
1387 }
1388
1389 int kdeth_process_eager(struct hfi1_packet *packet)
1390 {
1391         if (unlikely(rhf_err_flags(packet->rhf)))
1392                 handle_eflags(packet);
1393
1394         dd_dev_err(packet->rcd->dd,
1395                    "Unhandled eager packet received. Dropping.\n");
1396         return RHF_RCV_CONTINUE;
1397 }
1398
1399 int process_receive_invalid(struct hfi1_packet *packet)
1400 {
1401         dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1402                    rhf_rcv_type(packet->rhf));
1403         return RHF_RCV_CONTINUE;
1404 }