drivers/infiniband/hw/qib/qib_driver.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/spinlock.h>
  35 #include <linux/pci.h>
  36 #include <linux/io.h>
  37 #include <linux/delay.h>
  38 #include <linux/netdevice.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/module.h>
  41 #include <linux/prefetch.h>
  42
  43 #include "qib.h"
  44
  45 /*
  46  * The size has to be longer than this string, so we can append
  47  * board/chip information to it in the init code.
  48  */
  49 const char ib_qib_version[] = QIB_IDSTR "\n";
  50
  51 DEFINE_SPINLOCK(qib_devs_lock);
  52 LIST_HEAD(qib_dev_list);
  53 DEFINE_MUTEX(qib_mutex);        /* general driver use */
  54
  55 unsigned qib_ibmtu;
  56 module_param_named(ibmtu, qib_ibmtu, uint, S_IRUGO);
  57 MODULE_PARM_DESC(ibmtu, "Set max IB MTU (0=2KB, 1=256, 2=512, ... 5=4096");
  58
  59 unsigned qib_compat_ddr_negotiate = 1;
  60 module_param_named(compat_ddr_negotiate, qib_compat_ddr_negotiate, uint,
  61                    S_IWUSR | S_IRUGO);
  62 MODULE_PARM_DESC(compat_ddr_negotiate,
  63                  "Attempt pre-IBTA 1.2 DDR speed negotiation");
  64
  65 MODULE_LICENSE("Dual BSD/GPL");
  66 MODULE_AUTHOR("QLogic <support@qlogic.com>");
  67 MODULE_DESCRIPTION("QLogic IB driver");
  68
  69 /*
  70  * QIB_PIO_MAXIBHDR is the max IB header size allowed for in our
  71  * PIO send buffers.  This is well beyond anything currently
  72  * defined in the InfiniBand spec.
  73  */
  74 #define QIB_PIO_MAXIBHDR 128
  75
  76 /*
  77  * QIB_MAX_PKT_RCV is the max # if packets processed per receive interrupt.
  78  */
  79 #define QIB_MAX_PKT_RECV 64
  80
  81 struct qlogic_ib_stats qib_stats;
  82
  83 const char *qib_get_unit_name(int unit)
  84 {
  85         static char iname[16];
  86
  87         snprintf(iname, sizeof iname, "infinipath%u", unit);
  88         return iname;
  89 }
  90
  91 /*
  92  * Return count of units with at least one port ACTIVE.
  93  */
  94 int qib_count_active_units(void)
  95 {
  96         struct qib_devdata *dd;
  97         struct qib_pportdata *ppd;
  98         unsigned long flags;
  99         int pidx, nunits_active = 0;
 100
 101         spin_lock_irqsave(&qib_devs_lock, flags);
 102         list_for_each_entry(dd, &qib_dev_list, list) {
 103                 if (!(dd->flags & QIB_PRESENT) || !dd->kregbase)
 104                         continue;
 105                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 106                         ppd = dd->pport + pidx;
 107                         if (ppd->lid && (ppd->lflags & (QIBL_LINKINIT |
 108                                          QIBL_LINKARMED | QIBL_LINKACTIVE))) {
 109                                 nunits_active++;
 110                                 break;
 111                         }
 112                 }
 113         }
 114         spin_unlock_irqrestore(&qib_devs_lock, flags);
 115         return nunits_active;
 116 }
 117
 118 /*
 119  * Return count of all units, optionally return in arguments
 120  * the number of usable (present) units, and the number of
 121  * ports that are up.
 122  */
 123 int qib_count_units(int *npresentp, int *nupp)
 124 {
 125         int nunits = 0, npresent = 0, nup = 0;
 126         struct qib_devdata *dd;
 127         unsigned long flags;
 128         int pidx;
 129         struct qib_pportdata *ppd;
 130
 131         spin_lock_irqsave(&qib_devs_lock, flags);
 132
 133         list_for_each_entry(dd, &qib_dev_list, list) {
 134                 nunits++;
 135                 if ((dd->flags & QIB_PRESENT) && dd->kregbase)
 136                         npresent++;
 137                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 138                         ppd = dd->pport + pidx;
 139                         if (ppd->lid && (ppd->lflags & (QIBL_LINKINIT |
 140                                          QIBL_LINKARMED | QIBL_LINKACTIVE)))
 141                                 nup++;
 142                 }
 143         }
 144
 145         spin_unlock_irqrestore(&qib_devs_lock, flags);
 146
 147         if (npresentp)
 148                 *npresentp = npresent;
 149         if (nupp)
 150                 *nupp = nup;
 151
 152         return nunits;
 153 }
 154
 155 /**
 156  * qib_wait_linkstate - wait for an IB link state change to occur
 157  * @dd: the qlogic_ib device
 158  * @state: the state to wait for
 159  * @msecs: the number of milliseconds to wait
 160  *
 161  * wait up to msecs milliseconds for IB link state change to occur for
 162  * now, take the easy polling route.  Currently used only by
 163  * qib_set_linkstate.  Returns 0 if state reached, otherwise
 164  * -ETIMEDOUT state can have multiple states set, for any of several
 165  * transitions.
 166  */
 167 int qib_wait_linkstate(struct qib_pportdata *ppd, u32 state, int msecs)
 168 {
 169         int ret;
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&ppd->lflags_lock, flags);
 173         if (ppd->state_wanted) {
 174                 spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 175                 ret = -EBUSY;
 176                 goto bail;
 177         }
 178         ppd->state_wanted = state;
 179         spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 180         wait_event_interruptible_timeout(ppd->state_wait,
 181                                          (ppd->lflags & state),
 182                                          msecs_to_jiffies(msecs));
 183         spin_lock_irqsave(&ppd->lflags_lock, flags);
 184         ppd->state_wanted = 0;
 185         spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 186
 187         if (!(ppd->lflags & state))
 188                 ret = -ETIMEDOUT;
 189         else
 190                 ret = 0;
 191 bail:
 192         return ret;
 193 }
 194
 195 int qib_set_linkstate(struct qib_pportdata *ppd, u8 newstate)
 196 {
 197         u32 lstate;
 198         int ret;
 199         struct qib_devdata *dd = ppd->dd;
 200         unsigned long flags;
 201
 202         switch (newstate) {
 203         case QIB_IB_LINKDOWN_ONLY:
 204                 dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
 205                                  IB_LINKCMD_DOWN | IB_LINKINITCMD_NOP);
 206                 /* don't wait */
 207                 ret = 0;
 208                 goto bail;
 209
 210         case QIB_IB_LINKDOWN:
 211                 dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
 212                                  IB_LINKCMD_DOWN | IB_LINKINITCMD_POLL);
 213                 /* don't wait */
 214                 ret = 0;
 215                 goto bail;
 216
 217         case QIB_IB_LINKDOWN_SLEEP:
 218                 dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
 219                                  IB_LINKCMD_DOWN | IB_LINKINITCMD_SLEEP);
 220                 /* don't wait */
 221                 ret = 0;
 222                 goto bail;
 223
 224         case QIB_IB_LINKDOWN_DISABLE:
 225                 dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
 226                                  IB_LINKCMD_DOWN | IB_LINKINITCMD_DISABLE);
 227                 /* don't wait */
 228                 ret = 0;
 229                 goto bail;
 230
 231         case QIB_IB_LINKARM:
 232                 if (ppd->lflags & QIBL_LINKARMED) {
 233                         ret = 0;
 234                         goto bail;
 235                 }
 236                 if (!(ppd->lflags & (QIBL_LINKINIT | QIBL_LINKACTIVE))) {
 237                         ret = -EINVAL;
 238                         goto bail;
 239                 }
 240                 /*
 241                  * Since the port can be ACTIVE when we ask for ARMED,
 242                  * clear QIBL_LINKV so we can wait for a transition.
 243                  * If the link isn't ARMED, then something else happened
 244                  * and there is no point waiting for ARMED.
 245                  */
 246                 spin_lock_irqsave(&ppd->lflags_lock, flags);
 247                 ppd->lflags &= ~QIBL_LINKV;
 248                 spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 249                 dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
 250                                  IB_LINKCMD_ARMED | IB_LINKINITCMD_NOP);
 251                 lstate = QIBL_LINKV;
 252                 break;
 253
 254         case QIB_IB_LINKACTIVE:
 255                 if (ppd->lflags & QIBL_LINKACTIVE) {
 256                         ret = 0;
 257                         goto bail;
 258                 }
 259                 if (!(ppd->lflags & QIBL_LINKARMED)) {
 260                         ret = -EINVAL;
 261                         goto bail;
 262                 }
 263                 dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LSTATE,
 264                                  IB_LINKCMD_ACTIVE | IB_LINKINITCMD_NOP);
 265                 lstate = QIBL_LINKACTIVE;
 266                 break;
 267
 268         default:
 269                 ret = -EINVAL;
 270                 goto bail;
 271         }
 272         ret = qib_wait_linkstate(ppd, lstate, 10);
 273
 274 bail:
 275         return ret;
 276 }
 277
 278 /*
 279  * Get address of eager buffer from it's index (allocated in chunks, not
 280  * contiguous).
 281  */
 282 static inline void *qib_get_egrbuf(const struct qib_ctxtdata *rcd, u32 etail)
 283 {
 284         const u32 chunk = etail >> rcd->rcvegrbufs_perchunk_shift;
 285         const u32 idx =  etail & ((u32)rcd->rcvegrbufs_perchunk - 1);
 286
 287         return rcd->rcvegrbuf[chunk] + (idx << rcd->dd->rcvegrbufsize_shift);
 288 }
 289
 290 /*
 291  * Returns 1 if error was a CRC, else 0.
 292  * Needed for some chip's synthesized error counters.
 293  */
 294 static u32 qib_rcv_hdrerr(struct qib_ctxtdata *rcd, struct qib_pportdata *ppd,
 295                           u32 ctxt, u32 eflags, u32 l, u32 etail,
 296                           __le32 *rhf_addr, struct qib_message_header *rhdr)
 297 {
 298         u32 ret = 0;
 299
 300         if (eflags & (QLOGIC_IB_RHF_H_ICRCERR | QLOGIC_IB_RHF_H_VCRCERR))
 301                 ret = 1;
 302         else if (eflags == QLOGIC_IB_RHF_H_TIDERR) {
 303                 /* For TIDERR and RC QPs premptively schedule a NAK */
 304                 struct qib_ib_header *hdr = (struct qib_ib_header *) rhdr;
 305                 struct qib_other_headers *ohdr = NULL;
 306                 struct qib_ibport *ibp = &ppd->ibport_data;
 307                 struct qib_qp *qp = NULL;
 308                 u32 tlen = qib_hdrget_length_in_bytes(rhf_addr);
 309                 u16 lid  = be16_to_cpu(hdr->lrh[1]);
 310                 int lnh = be16_to_cpu(hdr->lrh[0]) & 3;
 311                 u32 qp_num;
 312                 u32 opcode;
 313                 u32 psn;
 314                 int diff;
 315
 316                 /* Sanity check packet */
 317                 if (tlen < 24)
 318                         goto drop;
 319
 320                 if (lid < QIB_MULTICAST_LID_BASE) {
 321                         lid &= ~((1 << ppd->lmc) - 1);
 322                         if (unlikely(lid != ppd->lid))
 323                                 goto drop;
 324                 }
 325
 326                 /* Check for GRH */
 327                 if (lnh == QIB_LRH_BTH)
 328                         ohdr = &hdr->u.oth;
 329                 else if (lnh == QIB_LRH_GRH) {
 330                         u32 vtf;
 331
 332                         ohdr = &hdr->u.l.oth;
 333                         if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
 334                                 goto drop;
 335                         vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow);
 336                         if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
 337                                 goto drop;
 338                 } else
 339                         goto drop;
 340
 341                 /* Get opcode and PSN from packet */
 342                 opcode = be32_to_cpu(ohdr->bth[0]);
 343                 opcode >>= 24;
 344                 psn = be32_to_cpu(ohdr->bth[2]);
 345
 346                 /* Get the destination QP number. */
 347                 qp_num = be32_to_cpu(ohdr->bth[1]) & QIB_QPN_MASK;
 348                 if (qp_num != QIB_MULTICAST_QPN) {
 349                         int ruc_res;
 350                         qp = qib_lookup_qpn(ibp, qp_num);
 351                         if (!qp)
 352                                 goto drop;
 353
 354                         /*
 355                          * Handle only RC QPs - for other QP types drop error
 356                          * packet.
 357                          */
 358                         spin_lock(&qp->r_lock);
 359
 360                         /* Check for valid receive state. */
 361                         if (!(ib_qib_state_ops[qp->state] &
 362                               QIB_PROCESS_RECV_OK)) {
 363                                 ibp->n_pkt_drops++;
 364                                 goto unlock;
 365                         }
 366
 367                         switch (qp->ibqp.qp_type) {
 368                         case IB_QPT_RC:
 369                                 ruc_res =
 370                                         qib_ruc_check_hdr(
 371                                                 ibp, hdr,
 372                                                 lnh == QIB_LRH_GRH,
 373                                                 qp,
 374                                                 be32_to_cpu(ohdr->bth[0]));
 375                                 if (ruc_res)
 376                                         goto unlock;
 377
 378                                 /* Only deal with RDMA Writes for now */
 379                                 if (opcode <
 380                                     IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) {
 381                                         diff = qib_cmp24(psn, qp->r_psn);
 382                                         if (!qp->r_nak_state && diff >= 0) {
 383                                                 ibp->n_rc_seqnak++;
 384                                                 qp->r_nak_state =
 385                                                         IB_NAK_PSN_ERROR;
 386                                                 /* Use the expected PSN. */
 387                                                 qp->r_ack_psn = qp->r_psn;
 388                                                 /*
 389                                                  * Wait to send the sequence
 390                                                  * NAK until all packets
 391                                                  * in the receive queue have
 392                                                  * been processed.
 393                                                  * Otherwise, we end up
 394                                                  * propagating congestion.
 395                                                  */
 396                                                 if (list_empty(&qp->rspwait)) {
 397                                                         qp->r_flags |=
 398                                                                 QIB_R_RSP_NAK;
 399                                                         atomic_inc(
 400                                                                 &qp->refcount);
 401                                                         list_add_tail(
 402                                                          &qp->rspwait,
 403                                                          &rcd->qp_wait_list);
 404                                                 }
 405                                         } /* Out of sequence NAK */
 406                                 } /* QP Request NAKs */
 407                                 break;
 408                         case IB_QPT_SMI:
 409                         case IB_QPT_GSI:
 410                         case IB_QPT_UD:
 411                         case IB_QPT_UC:
 412                         default:
 413                                 /* For now don't handle any other QP types */
 414                                 break;
 415                         }
 416
 417 unlock:
 418                         spin_unlock(&qp->r_lock);
 419                         /*
 420                          * Notify qib_destroy_qp() if it is waiting
 421                          * for us to finish.
 422                          */
 423                         if (atomic_dec_and_test(&qp->refcount))
 424                                 wake_up(&qp->wait);
 425                 } /* Unicast QP */
 426         } /* Valid packet with TIDErr */
 427
 428 drop:
 429         return ret;
 430 }
 431
 432 /*
 433  * qib_kreceive - receive a packet
 434  * @rcd: the qlogic_ib context
 435  * @llic: gets count of good packets needed to clear lli,
 436  *          (used with chips that need need to track crcs for lli)
 437  *
 438  * called from interrupt handler for errors or receive interrupt
 439  * Returns number of CRC error packets, needed by some chips for
 440  * local link integrity tracking.   crcs are adjusted down by following
 441  * good packets, if any, and count of good packets is also tracked.
 442  */
 443 u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
 444 {
 445         struct qib_devdata *dd = rcd->dd;
 446         struct qib_pportdata *ppd = rcd->ppd;
 447         __le32 *rhf_addr;
 448         void *ebuf;
 449         const u32 rsize = dd->rcvhdrentsize;        /* words */
 450         const u32 maxcnt = dd->rcvhdrcnt * rsize;   /* words */
 451         u32 etail = -1, l, hdrqtail;
 452         struct qib_message_header *hdr;
 453         u32 eflags, etype, tlen, i = 0, updegr = 0, crcs = 0;
 454         int last;
 455         u64 lval;
 456         struct qib_qp *qp, *nqp;
 457
 458         l = rcd->head;
 459         rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
 460         if (dd->flags & QIB_NODMA_RTAIL) {
 461                 u32 seq = qib_hdrget_seq(rhf_addr);
 462                 if (seq != rcd->seq_cnt)
 463                         goto bail;
 464                 hdrqtail = 0;
 465         } else {
 466                 hdrqtail = qib_get_rcvhdrtail(rcd);
 467                 if (l == hdrqtail)
 468                         goto bail;
 469                 smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 470         }
 471
 472         for (last = 0, i = 1; !last; i += !last) {
 473                 hdr = dd->f_get_msgheader(dd, rhf_addr);
 474                 eflags = qib_hdrget_err_flags(rhf_addr);
 475                 etype = qib_hdrget_rcv_type(rhf_addr);
 476                 /* total length */
 477                 tlen = qib_hdrget_length_in_bytes(rhf_addr);
 478                 ebuf = NULL;
 479                 if ((dd->flags & QIB_NODMA_RTAIL) ?
 480                     qib_hdrget_use_egr_buf(rhf_addr) :
 481                     (etype != RCVHQ_RCV_TYPE_EXPECTED)) {
 482                         etail = qib_hdrget_index(rhf_addr);
 483                         updegr = 1;
 484                         if (tlen > sizeof(*hdr) ||
 485                             etype >= RCVHQ_RCV_TYPE_NON_KD) {
 486                                 ebuf = qib_get_egrbuf(rcd, etail);
 487                                 prefetch_range(ebuf, tlen - sizeof(*hdr));
 488                         }
 489                 }
 490                 if (!eflags) {
 491                         u16 lrh_len = be16_to_cpu(hdr->lrh[2]) << 2;
 492
 493                         if (lrh_len != tlen) {
 494                                 qib_stats.sps_lenerrs++;
 495                                 goto move_along;
 496                         }
 497                 }
 498                 if (etype == RCVHQ_RCV_TYPE_NON_KD && !eflags &&
 499                     ebuf == NULL &&
 500                     tlen > (dd->rcvhdrentsize - 2 + 1 -
 501                                 qib_hdrget_offset(rhf_addr)) << 2) {
 502                         goto move_along;
 503                 }
 504
 505                 /*
 506                  * Both tiderr and qibhdrerr are set for all plain IB
 507                  * packets; only qibhdrerr should be set.
 508                  */
 509                 if (unlikely(eflags))
 510                         crcs += qib_rcv_hdrerr(rcd, ppd, rcd->ctxt, eflags, l,
 511                                                etail, rhf_addr, hdr);
 512                 else if (etype == RCVHQ_RCV_TYPE_NON_KD) {
 513                         qib_ib_rcv(rcd, hdr, ebuf, tlen);
 514                         if (crcs)
 515                                 crcs--;
 516                         else if (llic && *llic)
 517                                 --*llic;
 518                 }
 519 move_along:
 520                 l += rsize;
 521                 if (l >= maxcnt)
 522                         l = 0;
 523                 if (i == QIB_MAX_PKT_RECV)
 524                         last = 1;
 525
 526                 rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
 527                 if (dd->flags & QIB_NODMA_RTAIL) {
 528                         u32 seq = qib_hdrget_seq(rhf_addr);
 529
 530                         if (++rcd->seq_cnt > 13)
 531                                 rcd->seq_cnt = 1;
 532                         if (seq != rcd->seq_cnt)
 533                                 last = 1;
 534                 } else if (l == hdrqtail)
 535                         last = 1;
 536                 /*
 537                  * Update head regs etc., every 16 packets, if not last pkt,
 538                  * to help prevent rcvhdrq overflows, when many packets
 539                  * are processed and queue is nearly full.
 540                  * Don't request an interrupt for intermediate updates.
 541                  */
 542                 lval = l;
 543                 if (!last && !(i & 0xf)) {
 544                         dd->f_update_usrhead(rcd, lval, updegr, etail, i);
 545                         updegr = 0;
 546                 }
 547         }
 548         /*
 549          * Notify qib_destroy_qp() if it is waiting
 550          * for lookaside_qp to finish.
 551          */
 552         if (rcd->lookaside_qp) {
 553                 if (atomic_dec_and_test(&rcd->lookaside_qp->refcount))
 554                         wake_up(&rcd->lookaside_qp->wait);
 555                 rcd->lookaside_qp = NULL;
 556         }
 557
 558         rcd->head = l;
 559         rcd->pkt_count += i;
 560
 561         /*
 562          * Iterate over all QPs waiting to respond.
 563          * The list won't change since the IRQ is only run on one CPU.
 564          */
 565         list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
 566                 list_del_init(&qp->rspwait);
 567                 if (qp->r_flags & QIB_R_RSP_NAK) {
 568                         qp->r_flags &= ~QIB_R_RSP_NAK;
 569                         qib_send_rc_ack(qp);
 570                 }
 571                 if (qp->r_flags & QIB_R_RSP_SEND) {
 572                         unsigned long flags;
 573
 574                         qp->r_flags &= ~QIB_R_RSP_SEND;
 575                         spin_lock_irqsave(&qp->s_lock, flags);
 576                         if (ib_qib_state_ops[qp->state] &
 577                                         QIB_PROCESS_OR_FLUSH_SEND)
 578                                 qib_schedule_send(qp);
 579                         spin_unlock_irqrestore(&qp->s_lock, flags);
 580                 }
 581                 if (atomic_dec_and_test(&qp->refcount))
 582                         wake_up(&qp->wait);
 583         }
 584
 585 bail:
 586         /* Report number of packets consumed */
 587         if (npkts)
 588                 *npkts = i;
 589
 590         /*
 591          * Always write head at end, and setup rcv interrupt, even
 592          * if no packets were processed.
 593          */
 594         lval = (u64)rcd->head | dd->rhdrhead_intr_off;
 595         dd->f_update_usrhead(rcd, lval, updegr, etail, i);
 596         return crcs;
 597 }
 598
 599 /**
 600  * qib_set_mtu - set the MTU
 601  * @ppd: the perport data
 602  * @arg: the new MTU
 603  *
 604  * We can handle "any" incoming size, the issue here is whether we
 605  * need to restrict our outgoing size.   For now, we don't do any
 606  * sanity checking on this, and we don't deal with what happens to
 607  * programs that are already running when the size changes.
 608  * NOTE: changing the MTU will usually cause the IBC to go back to
 609  * link INIT state...
 610  */
 611 int qib_set_mtu(struct qib_pportdata *ppd, u16 arg)
 612 {
 613         u32 piosize;
 614         int ret, chk;
 615
 616         if (arg != 256 && arg != 512 && arg != 1024 && arg != 2048 &&
 617             arg != 4096) {
 618                 ret = -EINVAL;
 619                 goto bail;
 620         }
 621         chk = ib_mtu_enum_to_int(qib_ibmtu);
 622         if (chk > 0 && arg > chk) {
 623                 ret = -EINVAL;
 624                 goto bail;
 625         }
 626
 627         piosize = ppd->ibmaxlen;
 628         ppd->ibmtu = arg;
 629
 630         if (arg >= (piosize - QIB_PIO_MAXIBHDR)) {
 631                 /* Only if it's not the initial value (or reset to it) */
 632                 if (piosize != ppd->init_ibmaxlen) {
 633                         if (arg > piosize && arg <= ppd->init_ibmaxlen)
 634                                 piosize = ppd->init_ibmaxlen - 2 * sizeof(u32);
 635                         ppd->ibmaxlen = piosize;
 636                 }
 637         } else if ((arg + QIB_PIO_MAXIBHDR) != ppd->ibmaxlen) {
 638                 piosize = arg + QIB_PIO_MAXIBHDR - 2 * sizeof(u32);
 639                 ppd->ibmaxlen = piosize;
 640         }
 641
 642         ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_MTU, 0);
 643
 644         ret = 0;
 645
 646 bail:
 647         return ret;
 648 }
 649
 650 int qib_set_lid(struct qib_pportdata *ppd, u32 lid, u8 lmc)
 651 {
 652         struct qib_devdata *dd = ppd->dd;
 653         ppd->lid = lid;
 654         ppd->lmc = lmc;
 655
 656         dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LIDLMC,
 657                          lid | (~((1U << lmc) - 1)) << 16);
 658
 659         qib_devinfo(dd->pcidev, "IB%u:%u got a lid: 0x%x\n",
 660                     dd->unit, ppd->port, lid);
 661
 662         return 0;
 663 }
 664
 665 /*
 666  * Following deal with the "obviously simple" task of overriding the state
 667  * of the LEDS, which normally indicate link physical and logical status.
 668  * The complications arise in dealing with different hardware mappings
 669  * and the board-dependent routine being called from interrupts.
 670  * and then there's the requirement to _flash_ them.
 671  */
 672 #define LED_OVER_FREQ_SHIFT 8
 673 #define LED_OVER_FREQ_MASK (0xFF<<LED_OVER_FREQ_SHIFT)
 674 /* Below is "non-zero" to force override, but both actual LEDs are off */
 675 #define LED_OVER_BOTH_OFF (8)
 676
 677 static void qib_run_led_override(unsigned long opaque)
 678 {
 679         struct qib_pportdata *ppd = (struct qib_pportdata *)opaque;
 680         struct qib_devdata *dd = ppd->dd;
 681         int timeoff;
 682         int ph_idx;
 683
 684         if (!(dd->flags & QIB_INITTED))
 685                 return;
 686
 687         ph_idx = ppd->led_override_phase++ & 1;
 688         ppd->led_override = ppd->led_override_vals[ph_idx];
 689         timeoff = ppd->led_override_timeoff;
 690
 691         dd->f_setextled(ppd, 1);
 692         /*
 693          * don't re-fire the timer if user asked for it to be off; we let
 694          * it fire one more time after they turn it off to simplify
 695          */
 696         if (ppd->led_override_vals[0] || ppd->led_override_vals[1])
 697                 mod_timer(&ppd->led_override_timer, jiffies + timeoff);
 698 }
 699
 700 void qib_set_led_override(struct qib_pportdata *ppd, unsigned int val)
 701 {
 702         struct qib_devdata *dd = ppd->dd;
 703         int timeoff, freq;
 704
 705         if (!(dd->flags & QIB_INITTED))
 706                 return;
 707
 708         /* First check if we are blinking. If not, use 1HZ polling */
 709         timeoff = HZ;
 710         freq = (val & LED_OVER_FREQ_MASK) >> LED_OVER_FREQ_SHIFT;
 711
 712         if (freq) {
 713                 /* For blink, set each phase from one nybble of val */
 714                 ppd->led_override_vals[0] = val & 0xF;
 715                 ppd->led_override_vals[1] = (val >> 4) & 0xF;
 716                 timeoff = (HZ << 4)/freq;
 717         } else {
 718                 /* Non-blink set both phases the same. */
 719                 ppd->led_override_vals[0] = val & 0xF;
 720                 ppd->led_override_vals[1] = val & 0xF;
 721         }
 722         ppd->led_override_timeoff = timeoff;
 723
 724         /*
 725          * If the timer has not already been started, do so. Use a "quick"
 726          * timeout so the function will be called soon, to look at our request.
 727          */
 728         if (atomic_inc_return(&ppd->led_override_timer_active) == 1) {
 729                 /* Need to start timer */
 730                 init_timer(&ppd->led_override_timer);
 731                 ppd->led_override_timer.function = qib_run_led_override;
 732                 ppd->led_override_timer.data = (unsigned long) ppd;
 733                 ppd->led_override_timer.expires = jiffies + 1;
 734                 add_timer(&ppd->led_override_timer);
 735         } else {
 736                 if (ppd->led_override_vals[0] || ppd->led_override_vals[1])
 737                         mod_timer(&ppd->led_override_timer, jiffies + 1);
 738                 atomic_dec(&ppd->led_override_timer_active);
 739         }
 740 }
 741
 742 /**
 743  * qib_reset_device - reset the chip if possible
 744  * @unit: the device to reset
 745  *
 746  * Whether or not reset is successful, we attempt to re-initialize the chip
 747  * (that is, much like a driver unload/reload).  We clear the INITTED flag
 748  * so that the various entry points will fail until we reinitialize.  For
 749  * now, we only allow this if no user contexts are open that use chip resources
 750  */
 751 int qib_reset_device(int unit)
 752 {
 753         int ret, i;
 754         struct qib_devdata *dd = qib_lookup(unit);
 755         struct qib_pportdata *ppd;
 756         unsigned long flags;
 757         int pidx;
 758
 759         if (!dd) {
 760                 ret = -ENODEV;
 761                 goto bail;
 762         }
 763
 764         qib_devinfo(dd->pcidev, "Reset on unit %u requested\n", unit);
 765
 766         if (!dd->kregbase || !(dd->flags & QIB_PRESENT)) {
 767                 qib_devinfo(dd->pcidev, "Invalid unit number %u or "
 768                             "not initialized or not present\n", unit);
 769                 ret = -ENXIO;
 770                 goto bail;
 771         }
 772
 773         spin_lock_irqsave(&dd->uctxt_lock, flags);
 774         if (dd->rcd)
 775                 for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) {
 776                         if (!dd->rcd[i] || !dd->rcd[i]->cnt)
 777                                 continue;
 778                         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 779                         ret = -EBUSY;
 780                         goto bail;
 781                 }
 782         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 783
 784         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 785                 ppd = dd->pport + pidx;
 786                 if (atomic_read(&ppd->led_override_timer_active)) {
 787                         /* Need to stop LED timer, _then_ shut off LEDs */
 788                         del_timer_sync(&ppd->led_override_timer);
 789                         atomic_set(&ppd->led_override_timer_active, 0);
 790                 }
 791
 792                 /* Shut off LEDs after we are sure timer is not running */
 793                 ppd->led_override = LED_OVER_BOTH_OFF;
 794                 dd->f_setextled(ppd, 0);
 795                 if (dd->flags & QIB_HAS_SEND_DMA)
 796                         qib_teardown_sdma(ppd);
 797         }
 798
 799         ret = dd->f_reset(dd);
 800         if (ret == 1)
 801                 ret = qib_init(dd, 1);
 802         else
 803                 ret = -EAGAIN;
 804         if (ret)
 805                 qib_dev_err(dd, "Reinitialize unit %u after "
 806                             "reset failed with %d\n", unit, ret);
 807         else
 808                 qib_devinfo(dd->pcidev, "Reinitialized unit %u after "
 809                             "resetting\n", unit);
 810
 811 bail:
 812         return ret;
 813 }