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