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 8192");
  79
  80 unsigned int hfi1_cu = 1;
  81 module_param_named(cu, hfi1_cu, uint, S_IRUGO);
  82 MODULE_PARM_DESC(cu, "Credit return units");
  83
  84 unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
  85 static int hfi1_caps_set(const char *, const struct kernel_param *);
  86 static int hfi1_caps_get(char *, const struct kernel_param *);
  87 static const struct kernel_param_ops cap_ops = {
  88         .set = hfi1_caps_set,
  89         .get = hfi1_caps_get
  90 };
  91 module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
  92 MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
  93
  94 MODULE_LICENSE("Dual BSD/GPL");
  95 MODULE_DESCRIPTION("Intel Omni-Path Architecture driver");
  96 MODULE_VERSION(HFI1_DRIVER_VERSION);
  97
  98 /*
  99  * MAX_PKT_RCV is the max # if packets processed per receive interrupt.
 100  */
 101 #define MAX_PKT_RECV 64
 102 #define EGR_HEAD_UPDATE_THRESHOLD 16
 103
 104 struct hfi1_ib_stats hfi1_stats;
 105
 106 static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
 107 {
 108         int ret = 0;
 109         unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
 110                 cap_mask = *cap_mask_ptr, value, diff,
 111                 write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
 112                               HFI1_CAP_WRITABLE_MASK);
 113
 114         ret = kstrtoul(val, 0, &value);
 115         if (ret) {
 116                 pr_warn("Invalid module parameter value for 'cap_mask'\n");
 117                 goto done;
 118         }
 119         /* Get the changed bits (except the locked bit) */
 120         diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
 121
 122         /* Remove any bits that are not allowed to change after driver load */
 123         if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
 124                 pr_warn("Ignoring non-writable capability bits %#lx\n",
 125                         diff & ~write_mask);
 126                 diff &= write_mask;
 127         }
 128
 129         /* Mask off any reserved bits */
 130         diff &= ~HFI1_CAP_RESERVED_MASK;
 131         /* Clear any previously set and changing bits */
 132         cap_mask &= ~diff;
 133         /* Update the bits with the new capability */
 134         cap_mask |= (value & diff);
 135         /* Check for any kernel/user restrictions */
 136         diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
 137                 ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
 138         cap_mask &= ~diff;
 139         /* Set the bitmask to the final set */
 140         *cap_mask_ptr = cap_mask;
 141 done:
 142         return ret;
 143 }
 144
 145 static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
 146 {
 147         unsigned long cap_mask = *(unsigned long *)kp->arg;
 148
 149         cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
 150         cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
 151
 152         return scnprintf(buffer, PAGE_SIZE, "0x%lx", cap_mask);
 153 }
 154
 155 const char *get_unit_name(int unit)
 156 {
 157         static char iname[16];
 158
 159         snprintf(iname, sizeof(iname), DRIVER_NAME "_%u", unit);
 160         return iname;
 161 }
 162
 163 const char *get_card_name(struct rvt_dev_info *rdi)
 164 {
 165         struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
 166         struct hfi1_devdata *dd = container_of(ibdev,
 167                                                struct hfi1_devdata, verbs_dev);
 168         return get_unit_name(dd->unit);
 169 }
 170
 171 struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
 172 {
 173         struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
 174         struct hfi1_devdata *dd = container_of(ibdev,
 175                                                struct hfi1_devdata, verbs_dev);
 176         return dd->pcidev;
 177 }
 178
 179 /*
 180  * Return count of units with at least one port ACTIVE.
 181  */
 182 int hfi1_count_active_units(void)
 183 {
 184         struct hfi1_devdata *dd;
 185         struct hfi1_pportdata *ppd;
 186         unsigned long flags;
 187         int pidx, nunits_active = 0;
 188
 189         spin_lock_irqsave(&hfi1_devs_lock, flags);
 190         list_for_each_entry(dd, &hfi1_dev_list, list) {
 191                 if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase)
 192                         continue;
 193                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 194                         ppd = dd->pport + pidx;
 195                         if (ppd->lid && ppd->linkup) {
 196                                 nunits_active++;
 197                                 break;
 198                         }
 199                 }
 200         }
 201         spin_unlock_irqrestore(&hfi1_devs_lock, flags);
 202         return nunits_active;
 203 }
 204
 205 /*
 206  * Return count of all units, optionally return in arguments
 207  * the number of usable (present) units, and the number of
 208  * ports that are up.
 209  */
 210 int hfi1_count_units(int *npresentp, int *nupp)
 211 {
 212         int nunits = 0, npresent = 0, nup = 0;
 213         struct hfi1_devdata *dd;
 214         unsigned long flags;
 215         int pidx;
 216         struct hfi1_pportdata *ppd;
 217
 218         spin_lock_irqsave(&hfi1_devs_lock, flags);
 219
 220         list_for_each_entry(dd, &hfi1_dev_list, list) {
 221                 nunits++;
 222                 if ((dd->flags & HFI1_PRESENT) && dd->kregbase)
 223                         npresent++;
 224                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 225                         ppd = dd->pport + pidx;
 226                         if (ppd->lid && ppd->linkup)
 227                                 nup++;
 228                 }
 229         }
 230
 231         spin_unlock_irqrestore(&hfi1_devs_lock, flags);
 232
 233         if (npresentp)
 234                 *npresentp = npresent;
 235         if (nupp)
 236                 *nupp = nup;
 237
 238         return nunits;
 239 }
 240
 241 /*
 242  * Get address of eager buffer from it's index (allocated in chunks, not
 243  * contiguous).
 244  */
 245 static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
 246                                u8 *update)
 247 {
 248         u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
 249
 250         *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
 251         return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
 252                         (offset * RCV_BUF_BLOCK_SIZE));
 253 }
 254
 255 /*
 256  * Validate and encode the a given RcvArray Buffer size.
 257  * The function will check whether the given size falls within
 258  * allowed size ranges for the respective type and, optionally,
 259  * return the proper encoding.
 260  */
 261 inline int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
 262 {
 263         if (unlikely(!IS_ALIGNED(size, PAGE_SIZE)))
 264                 return 0;
 265         if (unlikely(size < MIN_EAGER_BUFFER))
 266                 return 0;
 267         if (size >
 268             (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
 269                 return 0;
 270         if (encoded)
 271                 *encoded = ilog2(size / PAGE_SIZE) + 1;
 272         return 1;
 273 }
 274
 275 static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
 276                        struct hfi1_packet *packet)
 277 {
 278         struct hfi1_message_header *rhdr = packet->hdr;
 279         u32 rte = rhf_rcv_type_err(packet->rhf);
 280         int lnh = be16_to_cpu(rhdr->lrh[0]) & 3;
 281         struct hfi1_ibport *ibp = &ppd->ibport_data;
 282         struct hfi1_devdata *dd = ppd->dd;
 283         struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
 284
 285         if (packet->rhf & (RHF_VCRC_ERR | RHF_ICRC_ERR))
 286                 return;
 287
 288         if (packet->rhf & RHF_TID_ERR) {
 289                 /* For TIDERR and RC QPs preemptively schedule a NAK */
 290                 struct hfi1_ib_header *hdr = (struct hfi1_ib_header *)rhdr;
 291                 struct hfi1_other_headers *ohdr = NULL;
 292                 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 293                 u16 lid  = be16_to_cpu(hdr->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 = &hdr->u.oth;
 304                 } else if (lnh == HFI1_LRH_GRH) {
 305                         u32 vtf;
 306
 307                         ohdr = &hdr->u.l.oth;
 308                         if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
 309                                 goto drop;
 310                         vtf = be32_to_cpu(hdr->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                                         hdr,
 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  = (be16_to_cpu(rhdr->lrh[0]) >> 12) & 0xf;
 395                         if (rhf_dc_info(packet->rhf))
 396                                 sc5 |= 0x10;
 397                         sl = ibp->sc_to_sl[sc5];
 398
 399                         lqpn = be32_to_cpu(bth[1]) & RVT_QPN_MASK;
 400                         rcu_read_lock();
 401                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
 402                         if (!qp) {
 403                                 rcu_read_unlock();
 404                                 goto drop;
 405                         }
 406
 407                         switch (qp->ibqp.qp_type) {
 408                         case IB_QPT_UD:
 409                                 rlid = 0;
 410                                 rqpn = 0;
 411                                 svc_type = IB_CC_SVCTYPE_UD;
 412                                 break;
 413                         case IB_QPT_UC:
 414                                 rlid = be16_to_cpu(rhdr->lrh[3]);
 415                                 rqpn = qp->remote_qpn;
 416                                 svc_type = IB_CC_SVCTYPE_UC;
 417                                 break;
 418                         default:
 419                                 goto drop;
 420                         }
 421
 422                         process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 423                         rcu_read_unlock();
 424                 }
 425
 426                 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
 427                 break;
 428         }
 429         default:
 430                 break;
 431         }
 432
 433 drop:
 434         return;
 435 }
 436
 437 static inline void init_packet(struct hfi1_ctxtdata *rcd,
 438                                struct hfi1_packet *packet)
 439 {
 440         packet->rsize = rcd->rcvhdrqentsize; /* words */
 441         packet->maxcnt = rcd->rcvhdrq_cnt * packet->rsize; /* words */
 442         packet->rcd = rcd;
 443         packet->updegr = 0;
 444         packet->etail = -1;
 445         packet->rhf_addr = get_rhf_addr(rcd);
 446         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 447         packet->rhqoff = rcd->head;
 448         packet->numpkt = 0;
 449         packet->rcv_flags = 0;
 450 }
 451
 452 static void process_ecn(struct rvt_qp *qp, struct hfi1_ib_header *hdr,
 453                         struct hfi1_other_headers *ohdr,
 454                         u64 rhf, u32 bth1, struct ib_grh *grh)
 455 {
 456         struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
 457         u32 rqpn = 0;
 458         u16 rlid;
 459         u8 sc5, svc_type;
 460
 461         switch (qp->ibqp.qp_type) {
 462         case IB_QPT_SMI:
 463         case IB_QPT_GSI:
 464         case IB_QPT_UD:
 465                 rlid = be16_to_cpu(hdr->lrh[3]);
 466                 rqpn = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;
 467                 svc_type = IB_CC_SVCTYPE_UD;
 468                 break;
 469         case IB_QPT_UC:
 470                 rlid = qp->remote_ah_attr.dlid;
 471                 rqpn = qp->remote_qpn;
 472                 svc_type = IB_CC_SVCTYPE_UC;
 473                 break;
 474         case IB_QPT_RC:
 475                 rlid = qp->remote_ah_attr.dlid;
 476                 rqpn = qp->remote_qpn;
 477                 svc_type = IB_CC_SVCTYPE_RC;
 478                 break;
 479         default:
 480                 return;
 481         }
 482
 483         sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf;
 484         if (rhf_dc_info(rhf))
 485                 sc5 |= 0x10;
 486
 487         if (bth1 & HFI1_FECN_SMASK) {
 488                 u16 pkey = (u16)be32_to_cpu(ohdr->bth[0]);
 489                 u16 dlid = be16_to_cpu(hdr->lrh[1]);
 490
 491                 return_cnp(ibp, qp, rqpn, pkey, dlid, rlid, sc5, grh);
 492         }
 493
 494         if (bth1 & HFI1_BECN_SMASK) {
 495                 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 496                 u32 lqpn = bth1 & RVT_QPN_MASK;
 497                 u8 sl = ibp->sc_to_sl[sc5];
 498
 499                 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
 500         }
 501 }
 502
 503 struct ps_mdata {
 504         struct hfi1_ctxtdata *rcd;
 505         u32 rsize;
 506         u32 maxcnt;
 507         u32 ps_head;
 508         u32 ps_tail;
 509         u32 ps_seq;
 510 };
 511
 512 static inline void init_ps_mdata(struct ps_mdata *mdata,
 513                                  struct hfi1_packet *packet)
 514 {
 515         struct hfi1_ctxtdata *rcd = packet->rcd;
 516
 517         mdata->rcd = rcd;
 518         mdata->rsize = packet->rsize;
 519         mdata->maxcnt = packet->maxcnt;
 520         mdata->ps_head = packet->rhqoff;
 521
 522         if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 523                 mdata->ps_tail = get_rcvhdrtail(rcd);
 524                 if (rcd->ctxt == HFI1_CTRL_CTXT)
 525                         mdata->ps_seq = rcd->seq_cnt;
 526                 else
 527                         mdata->ps_seq = 0; /* not used with DMA_RTAIL */
 528         } else {
 529                 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
 530                 mdata->ps_seq = rcd->seq_cnt;
 531         }
 532 }
 533
 534 static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
 535                           struct hfi1_ctxtdata *rcd)
 536 {
 537         if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL))
 538                 return mdata->ps_head == mdata->ps_tail;
 539         return mdata->ps_seq != rhf_rcv_seq(rhf);
 540 }
 541
 542 static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
 543                           struct hfi1_ctxtdata *rcd)
 544 {
 545         /*
 546          * Control context can potentially receive an invalid rhf.
 547          * Drop such packets.
 548          */
 549         if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
 550                 return mdata->ps_seq != rhf_rcv_seq(rhf);
 551
 552         return 0;
 553 }
 554
 555 static inline void update_ps_mdata(struct ps_mdata *mdata,
 556                                    struct hfi1_ctxtdata *rcd)
 557 {
 558         mdata->ps_head += mdata->rsize;
 559         if (mdata->ps_head >= mdata->maxcnt)
 560                 mdata->ps_head = 0;
 561
 562         /* Control context must do seq counting */
 563         if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ||
 564             (rcd->ctxt == HFI1_CTRL_CTXT)) {
 565                 if (++mdata->ps_seq > 13)
 566                         mdata->ps_seq = 1;
 567         }
 568 }
 569
 570 /*
 571  * prescan_rxq - search through the receive queue looking for packets
 572  * containing Excplicit Congestion Notifications (FECNs, or BECNs).
 573  * When an ECN is found, process the Congestion Notification, and toggle
 574  * it off.
 575  * This is declared as a macro to allow quick checking of the port to avoid
 576  * the overhead of a function call if not enabled.
 577  */
 578 #define prescan_rxq(rcd, packet) \
 579         do { \
 580                 if (rcd->ppd->cc_prescan) \
 581                         __prescan_rxq(packet); \
 582         } while (0)
 583 static void __prescan_rxq(struct hfi1_packet *packet)
 584 {
 585         struct hfi1_ctxtdata *rcd = packet->rcd;
 586         struct ps_mdata mdata;
 587
 588         init_ps_mdata(&mdata, packet);
 589
 590         while (1) {
 591                 struct hfi1_devdata *dd = rcd->dd;
 592                 struct hfi1_ibport *ibp = &rcd->ppd->ibport_data;
 593                 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
 594                                          dd->rhf_offset;
 595                 struct rvt_qp *qp;
 596                 struct hfi1_ib_header *hdr;
 597                 struct hfi1_other_headers *ohdr;
 598                 struct ib_grh *grh = NULL;
 599                 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
 600                 u64 rhf = rhf_to_cpu(rhf_addr);
 601                 u32 etype = rhf_rcv_type(rhf), qpn, bth1;
 602                 int is_ecn = 0;
 603                 u8 lnh;
 604
 605                 if (ps_done(&mdata, rhf, rcd))
 606                         break;
 607
 608                 if (ps_skip(&mdata, rhf, rcd))
 609                         goto next;
 610
 611                 if (etype != RHF_RCV_TYPE_IB)
 612                         goto next;
 613
 614                 hdr = (struct hfi1_ib_header *)
 615                         hfi1_get_msgheader(dd, rhf_addr);
 616                 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
 617
 618                 if (lnh == HFI1_LRH_BTH) {
 619                         ohdr = &hdr->u.oth;
 620                 } else if (lnh == HFI1_LRH_GRH) {
 621                         ohdr = &hdr->u.l.oth;
 622                         grh = &hdr->u.l.grh;
 623                 } else {
 624                         goto next; /* just in case */
 625                 }
 626                 bth1 = be32_to_cpu(ohdr->bth[1]);
 627                 is_ecn = !!(bth1 & (HFI1_FECN_SMASK | HFI1_BECN_SMASK));
 628
 629                 if (!is_ecn)
 630                         goto next;
 631
 632                 qpn = bth1 & RVT_QPN_MASK;
 633                 rcu_read_lock();
 634                 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
 635
 636                 if (!qp) {
 637                         rcu_read_unlock();
 638                         goto next;
 639                 }
 640
 641                 process_ecn(qp, hdr, ohdr, rhf, bth1, grh);
 642                 rcu_read_unlock();
 643
 644                 /* turn off BECN, FECN */
 645                 bth1 &= ~(HFI1_FECN_SMASK | HFI1_BECN_SMASK);
 646                 ohdr->bth[1] = cpu_to_be32(bth1);
 647 next:
 648                 update_ps_mdata(&mdata, rcd);
 649         }
 650 }
 651
 652 static inline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
 653 {
 654         int ret = RCV_PKT_OK;
 655
 656         /* Set up for the next packet */
 657         packet->rhqoff += packet->rsize;
 658         if (packet->rhqoff >= packet->maxcnt)
 659                 packet->rhqoff = 0;
 660
 661         packet->numpkt++;
 662         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) {
 663                 if (thread) {
 664                         cond_resched();
 665                 } else {
 666                         ret = RCV_PKT_LIMIT;
 667                         this_cpu_inc(*packet->rcd->dd->rcv_limit);
 668                 }
 669         }
 670
 671         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 672                                      packet->rcd->dd->rhf_offset;
 673         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 674
 675         return ret;
 676 }
 677
 678 static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
 679 {
 680         int ret = RCV_PKT_OK;
 681
 682         packet->hdr = hfi1_get_msgheader(packet->rcd->dd,
 683                                          packet->rhf_addr);
 684         packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
 685         packet->etype = rhf_rcv_type(packet->rhf);
 686         /* total length */
 687         packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
 688         /* retrieve eager buffer details */
 689         packet->ebuf = NULL;
 690         if (rhf_use_egr_bfr(packet->rhf)) {
 691                 packet->etail = rhf_egr_index(packet->rhf);
 692                 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
 693                                  &packet->updegr);
 694                 /*
 695                  * Prefetch the contents of the eager buffer.  It is
 696                  * OK to send a negative length to prefetch_range().
 697                  * The +2 is the size of the RHF.
 698                  */
 699                 prefetch_range(packet->ebuf,
 700                                packet->tlen - ((packet->rcd->rcvhdrqentsize -
 701                                                (rhf_hdrq_offset(packet->rhf)
 702                                                 + 2)) * 4));
 703         }
 704
 705         /*
 706          * Call a type specific handler for the packet. We
 707          * should be able to trust that etype won't be beyond
 708          * the range of valid indexes. If so something is really
 709          * wrong and we can probably just let things come
 710          * crashing down. There is no need to eat another
 711          * comparison in this performance critical code.
 712          */
 713         packet->rcd->dd->rhf_rcv_function_map[packet->etype](packet);
 714         packet->numpkt++;
 715
 716         /* Set up for the next packet */
 717         packet->rhqoff += packet->rsize;
 718         if (packet->rhqoff >= packet->maxcnt)
 719                 packet->rhqoff = 0;
 720
 721         if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) {
 722                 if (thread) {
 723                         cond_resched();
 724                 } else {
 725                         ret = RCV_PKT_LIMIT;
 726                         this_cpu_inc(*packet->rcd->dd->rcv_limit);
 727                 }
 728         }
 729
 730         packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
 731                                       packet->rcd->dd->rhf_offset;
 732         packet->rhf = rhf_to_cpu(packet->rhf_addr);
 733
 734         return ret;
 735 }
 736
 737 static inline void process_rcv_update(int last, struct hfi1_packet *packet)
 738 {
 739         /*
 740          * Update head regs etc., every 16 packets, if not last pkt,
 741          * to help prevent rcvhdrq overflows, when many packets
 742          * are processed and queue is nearly full.
 743          * Don't request an interrupt for intermediate updates.
 744          */
 745         if (!last && !(packet->numpkt & 0xf)) {
 746                 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
 747                                packet->etail, 0, 0);
 748                 packet->updegr = 0;
 749         }
 750         packet->rcv_flags = 0;
 751 }
 752
 753 static inline void finish_packet(struct hfi1_packet *packet)
 754 {
 755         /*
 756          * Nothing we need to free for the packet.
 757          *
 758          * The only thing we need to do is a final update and call for an
 759          * interrupt
 760          */
 761         update_usrhead(packet->rcd, packet->rcd->head, packet->updegr,
 762                        packet->etail, rcv_intr_dynamic, packet->numpkt);
 763 }
 764
 765 static inline void process_rcv_qp_work(struct hfi1_packet *packet)
 766 {
 767         struct hfi1_ctxtdata *rcd;
 768         struct rvt_qp *qp, *nqp;
 769
 770         rcd = packet->rcd;
 771         rcd->head = packet->rhqoff;
 772
 773         /*
 774          * Iterate over all QPs waiting to respond.
 775          * The list won't change since the IRQ is only run on one CPU.
 776          */
 777         list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
 778                 list_del_init(&qp->rspwait);
 779                 if (qp->r_flags & RVT_R_RSP_NAK) {
 780                         qp->r_flags &= ~RVT_R_RSP_NAK;
 781                         hfi1_send_rc_ack(rcd, qp, 0);
 782                 }
 783                 if (qp->r_flags & RVT_R_RSP_SEND) {
 784                         unsigned long flags;
 785
 786                         qp->r_flags &= ~RVT_R_RSP_SEND;
 787                         spin_lock_irqsave(&qp->s_lock, flags);
 788                         if (ib_rvt_state_ops[qp->state] &
 789                                         RVT_PROCESS_OR_FLUSH_SEND)
 790                                 hfi1_schedule_send(qp);
 791                         spin_unlock_irqrestore(&qp->s_lock, flags);
 792                 }
 793                 if (atomic_dec_and_test(&qp->refcount))
 794                         wake_up(&qp->wait);
 795         }
 796 }
 797
 798 /*
 799  * Handle receive interrupts when using the no dma rtail option.
 800  */
 801 int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 802 {
 803         u32 seq;
 804         int last = RCV_PKT_OK;
 805         struct hfi1_packet packet;
 806
 807         init_packet(rcd, &packet);
 808         seq = rhf_rcv_seq(packet.rhf);
 809         if (seq != rcd->seq_cnt) {
 810                 last = RCV_PKT_DONE;
 811                 goto bail;
 812         }
 813
 814         prescan_rxq(rcd, &packet);
 815
 816         while (last == RCV_PKT_OK) {
 817                 last = process_rcv_packet(&packet, thread);
 818                 seq = rhf_rcv_seq(packet.rhf);
 819                 if (++rcd->seq_cnt > 13)
 820                         rcd->seq_cnt = 1;
 821                 if (seq != rcd->seq_cnt)
 822                         last = RCV_PKT_DONE;
 823                 process_rcv_update(last, &packet);
 824         }
 825         process_rcv_qp_work(&packet);
 826 bail:
 827         finish_packet(&packet);
 828         return last;
 829 }
 830
 831 int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
 832 {
 833         u32 hdrqtail;
 834         int last = RCV_PKT_OK;
 835         struct hfi1_packet packet;
 836
 837         init_packet(rcd, &packet);
 838         hdrqtail = get_rcvhdrtail(rcd);
 839         if (packet.rhqoff == hdrqtail) {
 840                 last = RCV_PKT_DONE;
 841                 goto bail;
 842         }
 843         smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 844
 845         prescan_rxq(rcd, &packet);
 846
 847         while (last == RCV_PKT_OK) {
 848                 last = process_rcv_packet(&packet, thread);
 849                 if (packet.rhqoff == hdrqtail)
 850                         last = RCV_PKT_DONE;
 851                 process_rcv_update(last, &packet);
 852         }
 853         process_rcv_qp_work(&packet);
 854 bail:
 855         finish_packet(&packet);
 856         return last;
 857 }
 858
 859 static inline void set_all_nodma_rtail(struct hfi1_devdata *dd)
 860 {
 861         int i;
 862
 863         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 864                 dd->rcd[i]->do_interrupt =
 865                         &handle_receive_interrupt_nodma_rtail;
 866 }
 867
 868 static inline void set_all_dma_rtail(struct hfi1_devdata *dd)
 869 {
 870         int i;
 871
 872         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 873                 dd->rcd[i]->do_interrupt =
 874                         &handle_receive_interrupt_dma_rtail;
 875 }
 876
 877 void set_all_slowpath(struct hfi1_devdata *dd)
 878 {
 879         int i;
 880
 881         /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
 882         for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++)
 883                 dd->rcd[i]->do_interrupt = &handle_receive_interrupt;
 884 }
 885
 886 static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd,
 887                                       struct hfi1_packet packet,
 888                                       struct hfi1_devdata *dd)
 889 {
 890         struct work_struct *lsaw = &rcd->ppd->linkstate_active_work;
 891         struct hfi1_message_header *hdr = hfi1_get_msgheader(packet.rcd->dd,
 892                                                              packet.rhf_addr);
 893
 894         if (hdr2sc(hdr, packet.rhf) != 0xf) {
 895                 int hwstate = read_logical_state(dd);
 896
 897                 if (hwstate != LSTATE_ACTIVE) {
 898                         dd_dev_info(dd, "Unexpected link state %d\n", hwstate);
 899                         return 0;
 900                 }
 901
 902                 queue_work(rcd->ppd->hfi1_wq, lsaw);
 903                 return 1;
 904         }
 905         return 0;
 906 }
 907
 908 /*
 909  * handle_receive_interrupt - receive a packet
 910  * @rcd: the context
 911  *
 912  * Called from interrupt handler for errors or receive interrupt.
 913  * This is the slow path interrupt handler.
 914  */
 915 int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
 916 {
 917         struct hfi1_devdata *dd = rcd->dd;
 918         u32 hdrqtail;
 919         int needset, last = RCV_PKT_OK;
 920         struct hfi1_packet packet;
 921         int skip_pkt = 0;
 922
 923         /* Control context will always use the slow path interrupt handler */
 924         needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
 925
 926         init_packet(rcd, &packet);
 927
 928         if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 929                 u32 seq = rhf_rcv_seq(packet.rhf);
 930
 931                 if (seq != rcd->seq_cnt) {
 932                         last = RCV_PKT_DONE;
 933                         goto bail;
 934                 }
 935                 hdrqtail = 0;
 936         } else {
 937                 hdrqtail = get_rcvhdrtail(rcd);
 938                 if (packet.rhqoff == hdrqtail) {
 939                         last = RCV_PKT_DONE;
 940                         goto bail;
 941                 }
 942                 smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 943
 944                 /*
 945                  * Control context can potentially receive an invalid
 946                  * rhf. Drop such packets.
 947                  */
 948                 if (rcd->ctxt == HFI1_CTRL_CTXT) {
 949                         u32 seq = rhf_rcv_seq(packet.rhf);
 950
 951                         if (seq != rcd->seq_cnt)
 952                                 skip_pkt = 1;
 953                 }
 954         }
 955
 956         prescan_rxq(rcd, &packet);
 957
 958         while (last == RCV_PKT_OK) {
 959                 if (unlikely(dd->do_drop &&
 960                              atomic_xchg(&dd->drop_packet, DROP_PACKET_OFF) ==
 961                              DROP_PACKET_ON)) {
 962                         dd->do_drop = 0;
 963
 964                         /* On to the next packet */
 965                         packet.rhqoff += packet.rsize;
 966                         packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
 967                                           packet.rhqoff +
 968                                           dd->rhf_offset;
 969                         packet.rhf = rhf_to_cpu(packet.rhf_addr);
 970
 971                 } else if (skip_pkt) {
 972                         last = skip_rcv_packet(&packet, thread);
 973                         skip_pkt = 0;
 974                 } else {
 975                         /* Auto activate link on non-SC15 packet receive */
 976                         if (unlikely(rcd->ppd->host_link_state ==
 977                                      HLS_UP_ARMED) &&
 978                             set_armed_to_active(rcd, packet, dd))
 979                                 goto bail;
 980                         last = process_rcv_packet(&packet, thread);
 981                 }
 982
 983                 if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
 984                         u32 seq = rhf_rcv_seq(packet.rhf);
 985
 986                         if (++rcd->seq_cnt > 13)
 987                                 rcd->seq_cnt = 1;
 988                         if (seq != rcd->seq_cnt)
 989                                 last = RCV_PKT_DONE;
 990                         if (needset) {
 991                                 dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n");
 992                                 set_all_nodma_rtail(dd);
 993                                 needset = 0;
 994                         }
 995                 } else {
 996                         if (packet.rhqoff == hdrqtail)
 997                                 last = RCV_PKT_DONE;
 998                         /*
 999                          * Control context can potentially receive an invalid
1000                          * rhf. Drop such packets.
1001                          */
1002                         if (rcd->ctxt == HFI1_CTRL_CTXT) {
1003                                 u32 seq = rhf_rcv_seq(packet.rhf);
1004
1005                                 if (++rcd->seq_cnt > 13)
1006                                         rcd->seq_cnt = 1;
1007                                 if (!last && (seq != rcd->seq_cnt))
1008                                         skip_pkt = 1;
1009                         }
1010
1011                         if (needset) {
1012                                 dd_dev_info(dd,
1013                                             "Switching to DMA_RTAIL\n");
1014                                 set_all_dma_rtail(dd);
1015                                 needset = 0;
1016                         }
1017                 }
1018
1019                 process_rcv_update(last, &packet);
1020         }
1021
1022         process_rcv_qp_work(&packet);
1023
1024 bail:
1025         /*
1026          * Always write head at end, and setup rcv interrupt, even
1027          * if no packets were processed.
1028          */
1029         finish_packet(&packet);
1030         return last;
1031 }
1032
1033 /*
1034  * We may discover in the interrupt that the hardware link state has
1035  * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1036  * and we need to update the driver's notion of the link state.  We cannot
1037  * run set_link_state from interrupt context, so we queue this function on
1038  * a workqueue.
1039  *
1040  * We delay the regular interrupt processing until after the state changes
1041  * so that the link will be in the correct state by the time any application
1042  * we wake up attempts to send a reply to any message it received.
1043  * (Subsequent receive interrupts may possibly force the wakeup before we
1044  * update the link state.)
1045  *
1046  * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1047  * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1048  * so we're safe from use-after-free of the rcd.
1049  */
1050 void receive_interrupt_work(struct work_struct *work)
1051 {
1052         struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1053                                                   linkstate_active_work);
1054         struct hfi1_devdata *dd = ppd->dd;
1055         int i;
1056
1057         /* Received non-SC15 packet implies neighbor_normal */
1058         ppd->neighbor_normal = 1;
1059         set_link_state(ppd, HLS_UP_ACTIVE);
1060
1061         /*
1062          * Interrupt all kernel contexts that could have had an
1063          * interrupt during auto activation.
1064          */
1065         for (i = HFI1_CTRL_CTXT; i < dd->first_user_ctxt; i++)
1066                 force_recv_intr(dd->rcd[i]);
1067 }
1068
1069 /*
1070  * Convert a given MTU size to the on-wire MAD packet enumeration.
1071  * Return -1 if the size is invalid.
1072  */
1073 int mtu_to_enum(u32 mtu, int default_if_bad)
1074 {
1075         switch (mtu) {
1076         case     0: return OPA_MTU_0;
1077         case   256: return OPA_MTU_256;
1078         case   512: return OPA_MTU_512;
1079         case  1024: return OPA_MTU_1024;
1080         case  2048: return OPA_MTU_2048;
1081         case  4096: return OPA_MTU_4096;
1082         case  8192: return OPA_MTU_8192;
1083         case 10240: return OPA_MTU_10240;
1084         }
1085         return default_if_bad;
1086 }
1087
1088 u16 enum_to_mtu(int mtu)
1089 {
1090         switch (mtu) {
1091         case OPA_MTU_0:     return 0;
1092         case OPA_MTU_256:   return 256;
1093         case OPA_MTU_512:   return 512;
1094         case OPA_MTU_1024:  return 1024;
1095         case OPA_MTU_2048:  return 2048;
1096         case OPA_MTU_4096:  return 4096;
1097         case OPA_MTU_8192:  return 8192;
1098         case OPA_MTU_10240: return 10240;
1099         default: return 0xffff;
1100         }
1101 }
1102
1103 /*
1104  * set_mtu - set the MTU
1105  * @ppd: the per port data
1106  *
1107  * We can handle "any" incoming size, the issue here is whether we
1108  * need to restrict our outgoing size.  We do not deal with what happens
1109  * to programs that are already running when the size changes.
1110  */
1111 int set_mtu(struct hfi1_pportdata *ppd)
1112 {
1113         struct hfi1_devdata *dd = ppd->dd;
1114         int i, drain, ret = 0, is_up = 0;
1115
1116         ppd->ibmtu = 0;
1117         for (i = 0; i < ppd->vls_supported; i++)
1118                 if (ppd->ibmtu < dd->vld[i].mtu)
1119                         ppd->ibmtu = dd->vld[i].mtu;
1120         ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
1121
1122         mutex_lock(&ppd->hls_lock);
1123         if (ppd->host_link_state == HLS_UP_INIT ||
1124             ppd->host_link_state == HLS_UP_ARMED ||
1125             ppd->host_link_state == HLS_UP_ACTIVE)
1126                 is_up = 1;
1127
1128         drain = !is_ax(dd) && is_up;
1129
1130         if (drain)
1131                 /*
1132                  * MTU is specified per-VL. To ensure that no packet gets
1133                  * stuck (due, e.g., to the MTU for the packet's VL being
1134                  * reduced), empty the per-VL FIFOs before adjusting MTU.
1135                  */
1136                 ret = stop_drain_data_vls(dd);
1137
1138         if (ret) {
1139                 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1140                            __func__);
1141                 goto err;
1142         }
1143
1144         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
1145
1146         if (drain)
1147                 open_fill_data_vls(dd); /* reopen all VLs */
1148
1149 err:
1150         mutex_unlock(&ppd->hls_lock);
1151
1152         return ret;
1153 }
1154
1155 int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1156 {
1157         struct hfi1_devdata *dd = ppd->dd;
1158
1159         ppd->lid = lid;
1160         ppd->lmc = lmc;
1161         hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
1162
1163         dd_dev_info(dd, "IB%u:%u got a lid: 0x%x\n", dd->unit, ppd->port, lid);
1164
1165         return 0;
1166 }
1167
1168 void shutdown_led_override(struct hfi1_pportdata *ppd)
1169 {
1170         struct hfi1_devdata *dd = ppd->dd;
1171
1172         /*
1173          * This pairs with the memory barrier in hfi1_start_led_override to
1174          * ensure that we read the correct state of LED beaconing represented
1175          * by led_override_timer_active
1176          */
1177         smp_rmb();
1178         if (atomic_read(&ppd->led_override_timer_active)) {
1179                 del_timer_sync(&ppd->led_override_timer);
1180                 atomic_set(&ppd->led_override_timer_active, 0);
1181                 /* Ensure the atomic_set is visible to all CPUs */
1182                 smp_wmb();
1183         }
1184
1185         /* Hand control of the LED to the DC for normal operation */
1186         write_csr(dd, DCC_CFG_LED_CNTRL, 0);
1187 }
1188
1189 static void run_led_override(unsigned long opaque)
1190 {
1191         struct hfi1_pportdata *ppd = (struct hfi1_pportdata *)opaque;
1192         struct hfi1_devdata *dd = ppd->dd;
1193         unsigned long timeout;
1194         int phase_idx;
1195
1196         if (!(dd->flags & HFI1_INITTED))
1197                 return;
1198
1199         phase_idx = ppd->led_override_phase & 1;
1200
1201         setextled(dd, phase_idx);
1202
1203         timeout = ppd->led_override_vals[phase_idx];
1204
1205         /* Set up for next phase */
1206         ppd->led_override_phase = !ppd->led_override_phase;
1207
1208         mod_timer(&ppd->led_override_timer, jiffies + timeout);
1209 }
1210
1211 /*
1212  * To have the LED blink in a particular pattern, provide timeon and timeoff
1213  * in milliseconds.
1214  * To turn off custom blinking and return to normal operation, use
1215  * shutdown_led_override()
1216  */
1217 void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1218                              unsigned int timeoff)
1219 {
1220         if (!(ppd->dd->flags & HFI1_INITTED))
1221                 return;
1222
1223         /* Convert to jiffies for direct use in timer */
1224         ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
1225         ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
1226
1227         /* Arbitrarily start from LED on phase */
1228         ppd->led_override_phase = 1;
1229
1230         /*
1231          * If the timer has not already been started, do so. Use a "quick"
1232          * timeout so the handler will be called soon to look at our request.
1233          */
1234         if (!timer_pending(&ppd->led_override_timer)) {
1235                 setup_timer(&ppd->led_override_timer, run_led_override,
1236                             (unsigned long)ppd);
1237                 ppd->led_override_timer.expires = jiffies + 1;
1238                 add_timer(&ppd->led_override_timer);
1239                 atomic_set(&ppd->led_override_timer_active, 1);
1240                 /* Ensure the atomic_set is visible to all CPUs */
1241                 smp_wmb();
1242         }
1243 }
1244
1245 /**
1246  * hfi1_reset_device - reset the chip if possible
1247  * @unit: the device to reset
1248  *
1249  * Whether or not reset is successful, we attempt to re-initialize the chip
1250  * (that is, much like a driver unload/reload).  We clear the INITTED flag
1251  * so that the various entry points will fail until we reinitialize.  For
1252  * now, we only allow this if no user contexts are open that use chip resources
1253  */
1254 int hfi1_reset_device(int unit)
1255 {
1256         int ret, i;
1257         struct hfi1_devdata *dd = hfi1_lookup(unit);
1258         struct hfi1_pportdata *ppd;
1259         unsigned long flags;
1260         int pidx;
1261
1262         if (!dd) {
1263                 ret = -ENODEV;
1264                 goto bail;
1265         }
1266
1267         dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1268
1269         if (!dd->kregbase || !(dd->flags & HFI1_PRESENT)) {
1270                 dd_dev_info(dd,
1271                             "Invalid unit number %u or not initialized or not present\n",
1272                             unit);
1273                 ret = -ENXIO;
1274                 goto bail;
1275         }
1276
1277         spin_lock_irqsave(&dd->uctxt_lock, flags);
1278         if (dd->rcd)
1279                 for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) {
1280                         if (!dd->rcd[i] || !dd->rcd[i]->cnt)
1281                                 continue;
1282                         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1283                         ret = -EBUSY;
1284                         goto bail;
1285                 }
1286         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1287
1288         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1289                 ppd = dd->pport + pidx;
1290
1291                 shutdown_led_override(ppd);
1292         }
1293         if (dd->flags & HFI1_HAS_SEND_DMA)
1294                 sdma_exit(dd);
1295
1296         hfi1_reset_cpu_counters(dd);
1297
1298         ret = hfi1_init(dd, 1);
1299
1300         if (ret)
1301                 dd_dev_err(dd,
1302                            "Reinitialize unit %u after reset failed with %d\n",
1303                            unit, ret);
1304         else
1305                 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1306                             unit);
1307
1308 bail:
1309         return ret;
1310 }
1311
1312 void handle_eflags(struct hfi1_packet *packet)
1313 {
1314         struct hfi1_ctxtdata *rcd = packet->rcd;
1315         u32 rte = rhf_rcv_type_err(packet->rhf);
1316
1317         rcv_hdrerr(rcd, rcd->ppd, packet);
1318         if (rhf_err_flags(packet->rhf))
1319                 dd_dev_err(rcd->dd,
1320                            "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s%s] rte 0x%x\n",
1321                            rcd->ctxt, packet->rhf,
1322                            packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1323                            packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1324                            packet->rhf & RHF_DC_ERR ? "dc " : "",
1325                            packet->rhf & RHF_TID_ERR ? "tid " : "",
1326                            packet->rhf & RHF_LEN_ERR ? "len " : "",
1327                            packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1328                            packet->rhf & RHF_VCRC_ERR ? "vcrc " : "",
1329                            packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1330                            rte);
1331 }
1332
1333 /*
1334  * The following functions are called by the interrupt handler. They are type
1335  * specific handlers for each packet type.
1336  */
1337 int process_receive_ib(struct hfi1_packet *packet)
1338 {
1339         trace_hfi1_rcvhdr(packet->rcd->ppd->dd,
1340                           packet->rcd->ctxt,
1341                           rhf_err_flags(packet->rhf),
1342                           RHF_RCV_TYPE_IB,
1343                           packet->hlen,
1344                           packet->tlen,
1345                           packet->updegr,
1346                           rhf_egr_index(packet->rhf));
1347
1348         if (unlikely(rhf_err_flags(packet->rhf))) {
1349                 handle_eflags(packet);
1350                 return RHF_RCV_CONTINUE;
1351         }
1352
1353         hfi1_ib_rcv(packet);
1354         return RHF_RCV_CONTINUE;
1355 }
1356
1357 int process_receive_bypass(struct hfi1_packet *packet)
1358 {
1359         if (unlikely(rhf_err_flags(packet->rhf)))
1360                 handle_eflags(packet);
1361
1362         dd_dev_err(packet->rcd->dd,
1363                    "Bypass packets are not supported in normal operation. Dropping\n");
1364         return RHF_RCV_CONTINUE;
1365 }
1366
1367 int process_receive_error(struct hfi1_packet *packet)
1368 {
1369         handle_eflags(packet);
1370
1371         if (unlikely(rhf_err_flags(packet->rhf)))
1372                 dd_dev_err(packet->rcd->dd,
1373                            "Unhandled error packet received. Dropping.\n");
1374
1375         return RHF_RCV_CONTINUE;
1376 }
1377
1378 int kdeth_process_expected(struct hfi1_packet *packet)
1379 {
1380         if (unlikely(rhf_err_flags(packet->rhf)))
1381                 handle_eflags(packet);
1382
1383         dd_dev_err(packet->rcd->dd,
1384                    "Unhandled expected packet received. Dropping.\n");
1385         return RHF_RCV_CONTINUE;
1386 }
1387
1388 int kdeth_process_eager(struct hfi1_packet *packet)
1389 {
1390         if (unlikely(rhf_err_flags(packet->rhf)))
1391                 handle_eflags(packet);
1392
1393         dd_dev_err(packet->rcd->dd,
1394                    "Unhandled eager packet received. Dropping.\n");
1395         return RHF_RCV_CONTINUE;
1396 }
1397
1398 int process_receive_invalid(struct hfi1_packet *packet)
1399 {
1400         dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1401                    rhf_rcv_type(packet->rhf));
1402         return RHF_RCV_CONTINUE;
1403 }