drivers/infiniband/hw/qib/qib_driver.c

   1 /*
   2  * Copyright (c) 2021 Cornelis Networks. All rights reserved.
   3  * Copyright (c) 2013 Intel Corporation. All rights reserved.
   4  * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
   5  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  */
  35
  36 #include <linux/spinlock.h>
  37 #include <linux/pci.h>
  38 #include <linux/io.h>
  39 #include <linux/delay.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/module.h>
  43 #include <linux/prefetch.h>
  44
  45 #include "qib.h"
  46
  47 /*
  48  * The size has to be longer than this string, so we can append
  49  * board/chip information to it in the init code.
  50  */
  51 const char ib_qib_version[] = QIB_DRIVER_VERSION "\n";
  52
  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("Cornelis <support@cornelisnetworks.com>");
  67 MODULE_DESCRIPTION("Cornelis 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 struct pci_dev *qib_get_pci_dev(struct rvt_dev_info *rdi)
  84 {
  85         struct qib_ibdev *ibdev = container_of(rdi, struct qib_ibdev, rdi);
  86         struct qib_devdata *dd = container_of(ibdev,
  87                                               struct qib_devdata, verbs_dev);
  88         return dd->pcidev;
  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 index, flags;
  99         int pidx, nunits_active = 0;
 100
 101         xa_lock_irqsave(&qib_dev_table, flags);
 102         xa_for_each(&qib_dev_table, index, dd) {
 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         xa_unlock_irqrestore(&qib_dev_table, 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 index, flags;
 128         int pidx;
 129         struct qib_pportdata *ppd;
 130
 131         xa_lock_irqsave(&qib_dev_table, flags);
 132         xa_for_each(&qib_dev_table, index, dd) {
 133                 nunits++;
 134                 if ((dd->flags & QIB_PRESENT) && dd->kregbase)
 135                         npresent++;
 136                 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 137                         ppd = dd->pport + pidx;
 138                         if (ppd->lid && (ppd->lflags & (QIBL_LINKINIT |
 139                                          QIBL_LINKARMED | QIBL_LINKACTIVE)))
 140                                 nup++;
 141                 }
 142         }
 143         xa_unlock_irqrestore(&qib_dev_table, 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  * @ppd: 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_shift;
 283         const u32 idx =  etail & ((u32)rcd->rcvegrbufs_perchunk - 1);
 284
 285         return rcd->rcvegrbuf[chunk] + (idx << rcd->dd->rcvegrbufsize_shift);
 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 ib_header *hdr = (struct ib_header *)rhdr;
 303                 struct ib_other_headers *ohdr = NULL;
 304                 struct qib_ibport *ibp = &ppd->ibport_data;
 305                 struct qib_devdata *dd = ppd->dd;
 306                 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
 307                 struct rvt_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 < be16_to_cpu(IB_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]) & RVT_QPN_MASK;
 348                 if (qp_num != QIB_MULTICAST_QPN) {
 349                         int ruc_res;
 350
 351                         rcu_read_lock();
 352                         qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
 353                         if (!qp) {
 354                                 rcu_read_unlock();
 355                                 goto drop;
 356                         }
 357
 358                         /*
 359                          * Handle only RC QPs - for other QP types drop error
 360                          * packet.
 361                          */
 362                         spin_lock(&qp->r_lock);
 363
 364                         /* Check for valid receive state. */
 365                         if (!(ib_rvt_state_ops[qp->state] &
 366                               RVT_PROCESS_RECV_OK)) {
 367                                 ibp->rvp.n_pkt_drops++;
 368                                 goto unlock;
 369                         }
 370
 371                         switch (qp->ibqp.qp_type) {
 372                         case IB_QPT_RC:
 373                                 ruc_res =
 374                                         qib_ruc_check_hdr(
 375                                                 ibp, hdr,
 376                                                 lnh == QIB_LRH_GRH,
 377                                                 qp,
 378                                                 be32_to_cpu(ohdr->bth[0]));
 379                                 if (ruc_res)
 380                                         goto unlock;
 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->rvp.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                                                                 RVT_R_RSP_NAK;
 403                                                         rvt_get_qp(qp);
 404                                                         list_add_tail(
 405                                                          &qp->rspwait,
 406                                                          &rcd->qp_wait_list);
 407                                                 }
 408                                         } /* Out of sequence NAK */
 409                                 } /* QP Request NAKs */
 410                                 break;
 411                         case IB_QPT_SMI:
 412                         case IB_QPT_GSI:
 413                         case IB_QPT_UD:
 414                         case IB_QPT_UC:
 415                         default:
 416                                 /* For now don't handle any other QP types */
 417                                 break;
 418                         }
 419
 420 unlock:
 421                         spin_unlock(&qp->r_lock);
 422                         rcu_read_unlock();
 423                 } /* Unicast QP */
 424         } /* Valid packet with TIDErr */
 425
 426 drop:
 427         return ret;
 428 }
 429
 430 /*
 431  * qib_kreceive - receive a packet
 432  * @rcd: the qlogic_ib context
 433  * @llic: gets count of good packets needed to clear lli,
 434  *          (used with chips that need need to track crcs for lli)
 435  *
 436  * called from interrupt handler for errors or receive interrupt
 437  * Returns number of CRC error packets, needed by some chips for
 438  * local link integrity tracking.   crcs are adjusted down by following
 439  * good packets, if any, and count of good packets is also tracked.
 440  */
 441 u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
 442 {
 443         struct qib_devdata *dd = rcd->dd;
 444         struct qib_pportdata *ppd = rcd->ppd;
 445         __le32 *rhf_addr;
 446         void *ebuf;
 447         const u32 rsize = dd->rcvhdrentsize;        /* words */
 448         const u32 maxcnt = dd->rcvhdrcnt * rsize;   /* words */
 449         u32 etail = -1, l, hdrqtail;
 450         struct qib_message_header *hdr;
 451         u32 eflags, etype, tlen, i = 0, updegr = 0, crcs = 0;
 452         int last;
 453         u64 lval;
 454         struct rvt_qp *qp, *nqp;
 455
 456         l = rcd->head;
 457         rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
 458         if (dd->flags & QIB_NODMA_RTAIL) {
 459                 u32 seq = qib_hdrget_seq(rhf_addr);
 460
 461                 if (seq != rcd->seq_cnt)
 462                         goto bail;
 463                 hdrqtail = 0;
 464         } else {
 465                 hdrqtail = qib_get_rcvhdrtail(rcd);
 466                 if (l == hdrqtail)
 467                         goto bail;
 468                 smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 469         }
 470
 471         for (last = 0, i = 1; !last; i += !last) {
 472                 hdr = dd->f_get_msgheader(dd, rhf_addr);
 473                 eflags = qib_hdrget_err_flags(rhf_addr);
 474                 etype = qib_hdrget_rcv_type(rhf_addr);
 475                 /* total length */
 476                 tlen = qib_hdrget_length_in_bytes(rhf_addr);
 477                 ebuf = NULL;
 478                 if ((dd->flags & QIB_NODMA_RTAIL) ?
 479                     qib_hdrget_use_egr_buf(rhf_addr) :
 480                     (etype != RCVHQ_RCV_TYPE_EXPECTED)) {
 481                         etail = qib_hdrget_index(rhf_addr);
 482                         updegr = 1;
 483                         if (tlen > sizeof(*hdr) ||
 484                             etype >= RCVHQ_RCV_TYPE_NON_KD) {
 485                                 ebuf = qib_get_egrbuf(rcd, etail);
 486                                 prefetch_range(ebuf, tlen - sizeof(*hdr));
 487                         }
 488                 }
 489                 if (!eflags) {
 490                         u16 lrh_len = be16_to_cpu(hdr->lrh[2]) << 2;
 491
 492                         if (lrh_len != tlen) {
 493                                 qib_stats.sps_lenerrs++;
 494                                 goto move_along;
 495                         }
 496                 }
 497                 if (etype == RCVHQ_RCV_TYPE_NON_KD && !eflags &&
 498                     ebuf == NULL &&
 499                     tlen > (dd->rcvhdrentsize - 2 + 1 -
 500                                 qib_hdrget_offset(rhf_addr)) << 2) {
 501                         goto move_along;
 502                 }
 503
 504                 /*
 505                  * Both tiderr and qibhdrerr are set for all plain IB
 506                  * packets; only qibhdrerr should be set.
 507                  */
 508                 if (unlikely(eflags))
 509                         crcs += qib_rcv_hdrerr(rcd, ppd, rcd->ctxt, eflags, l,
 510                                                etail, rhf_addr, hdr);
 511                 else if (etype == RCVHQ_RCV_TYPE_NON_KD) {
 512                         qib_ib_rcv(rcd, hdr, ebuf, tlen);
 513                         if (crcs)
 514                                 crcs--;
 515                         else if (llic && *llic)
 516                                 --*llic;
 517                 }
 518 move_along:
 519                 l += rsize;
 520                 if (l >= maxcnt)
 521                         l = 0;
 522                 if (i == QIB_MAX_PKT_RECV)
 523                         last = 1;
 524
 525                 rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
 526                 if (dd->flags & QIB_NODMA_RTAIL) {
 527                         u32 seq = qib_hdrget_seq(rhf_addr);
 528
 529                         if (++rcd->seq_cnt > 13)
 530                                 rcd->seq_cnt = 1;
 531                         if (seq != rcd->seq_cnt)
 532                                 last = 1;
 533                 } else if (l == hdrqtail)
 534                         last = 1;
 535                 /*
 536                  * Update head regs etc., every 16 packets, if not last pkt,
 537                  * to help prevent rcvhdrq overflows, when many packets
 538                  * are processed and queue is nearly full.
 539                  * Don't request an interrupt for intermediate updates.
 540                  */
 541                 lval = l;
 542                 if (!last && !(i & 0xf)) {
 543                         dd->f_update_usrhead(rcd, lval, updegr, etail, i);
 544                         updegr = 0;
 545                 }
 546         }
 547
 548         rcd->head = l;
 549
 550         /*
 551          * Iterate over all QPs waiting to respond.
 552          * The list won't change since the IRQ is only run on one CPU.
 553          */
 554         list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
 555                 list_del_init(&qp->rspwait);
 556                 if (qp->r_flags & RVT_R_RSP_NAK) {
 557                         qp->r_flags &= ~RVT_R_RSP_NAK;
 558                         qib_send_rc_ack(qp);
 559                 }
 560                 if (qp->r_flags & RVT_R_RSP_SEND) {
 561                         unsigned long flags;
 562
 563                         qp->r_flags &= ~RVT_R_RSP_SEND;
 564                         spin_lock_irqsave(&qp->s_lock, flags);
 565                         if (ib_rvt_state_ops[qp->state] &
 566                                         RVT_PROCESS_OR_FLUSH_SEND)
 567                                 qib_schedule_send(qp);
 568                         spin_unlock_irqrestore(&qp->s_lock, flags);
 569                 }
 570                 rvt_put_qp(qp);
 571         }
 572
 573 bail:
 574         /* Report number of packets consumed */
 575         if (npkts)
 576                 *npkts = i;
 577
 578         /*
 579          * Always write head at end, and setup rcv interrupt, even
 580          * if no packets were processed.
 581          */
 582         lval = (u64)rcd->head | dd->rhdrhead_intr_off;
 583         dd->f_update_usrhead(rcd, lval, updegr, etail, i);
 584         return crcs;
 585 }
 586
 587 /**
 588  * qib_set_mtu - set the MTU
 589  * @ppd: the perport data
 590  * @arg: the new MTU
 591  *
 592  * We can handle "any" incoming size, the issue here is whether we
 593  * need to restrict our outgoing size.   For now, we don't do any
 594  * sanity checking on this, and we don't deal with what happens to
 595  * programs that are already running when the size changes.
 596  * NOTE: changing the MTU will usually cause the IBC to go back to
 597  * link INIT state...
 598  */
 599 int qib_set_mtu(struct qib_pportdata *ppd, u16 arg)
 600 {
 601         u32 piosize;
 602         int ret, chk;
 603
 604         if (arg != 256 && arg != 512 && arg != 1024 && arg != 2048 &&
 605             arg != 4096) {
 606                 ret = -EINVAL;
 607                 goto bail;
 608         }
 609         chk = ib_mtu_enum_to_int(qib_ibmtu);
 610         if (chk > 0 && arg > chk) {
 611                 ret = -EINVAL;
 612                 goto bail;
 613         }
 614
 615         piosize = ppd->ibmaxlen;
 616         ppd->ibmtu = arg;
 617
 618         if (arg >= (piosize - QIB_PIO_MAXIBHDR)) {
 619                 /* Only if it's not the initial value (or reset to it) */
 620                 if (piosize != ppd->init_ibmaxlen) {
 621                         if (arg > piosize && arg <= ppd->init_ibmaxlen)
 622                                 piosize = ppd->init_ibmaxlen - 2 * sizeof(u32);
 623                         ppd->ibmaxlen = piosize;
 624                 }
 625         } else if ((arg + QIB_PIO_MAXIBHDR) != ppd->ibmaxlen) {
 626                 piosize = arg + QIB_PIO_MAXIBHDR - 2 * sizeof(u32);
 627                 ppd->ibmaxlen = piosize;
 628         }
 629
 630         ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_MTU, 0);
 631
 632         ret = 0;
 633
 634 bail:
 635         return ret;
 636 }
 637
 638 int qib_set_lid(struct qib_pportdata *ppd, u32 lid, u8 lmc)
 639 {
 640         struct qib_devdata *dd = ppd->dd;
 641
 642         ppd->lid = lid;
 643         ppd->lmc = lmc;
 644
 645         dd->f_set_ib_cfg(ppd, QIB_IB_CFG_LIDLMC,
 646                          lid | (~((1U << lmc) - 1)) << 16);
 647
 648         qib_devinfo(dd->pcidev, "IB%u:%u got a lid: 0x%x\n",
 649                     dd->unit, ppd->port, lid);
 650
 651         return 0;
 652 }
 653
 654 /*
 655  * Following deal with the "obviously simple" task of overriding the state
 656  * of the LEDS, which normally indicate link physical and logical status.
 657  * The complications arise in dealing with different hardware mappings
 658  * and the board-dependent routine being called from interrupts.
 659  * and then there's the requirement to _flash_ them.
 660  */
 661 #define LED_OVER_FREQ_SHIFT 8
 662 #define LED_OVER_FREQ_MASK (0xFF<<LED_OVER_FREQ_SHIFT)
 663 /* Below is "non-zero" to force override, but both actual LEDs are off */
 664 #define LED_OVER_BOTH_OFF (8)
 665
 666 static void qib_run_led_override(struct timer_list *t)
 667 {
 668         struct qib_pportdata *ppd = from_timer(ppd, t,
 669                                                     led_override_timer);
 670         struct qib_devdata *dd = ppd->dd;
 671         int timeoff;
 672         int ph_idx;
 673
 674         if (!(dd->flags & QIB_INITTED))
 675                 return;
 676
 677         ph_idx = ppd->led_override_phase++ & 1;
 678         ppd->led_override = ppd->led_override_vals[ph_idx];
 679         timeoff = ppd->led_override_timeoff;
 680
 681         dd->f_setextled(ppd, 1);
 682         /*
 683          * don't re-fire the timer if user asked for it to be off; we let
 684          * it fire one more time after they turn it off to simplify
 685          */
 686         if (ppd->led_override_vals[0] || ppd->led_override_vals[1])
 687                 mod_timer(&ppd->led_override_timer, jiffies + timeoff);
 688 }
 689
 690 void qib_set_led_override(struct qib_pportdata *ppd, unsigned int val)
 691 {
 692         struct qib_devdata *dd = ppd->dd;
 693         int timeoff, freq;
 694
 695         if (!(dd->flags & QIB_INITTED))
 696                 return;
 697
 698         /* First check if we are blinking. If not, use 1HZ polling */
 699         timeoff = HZ;
 700         freq = (val & LED_OVER_FREQ_MASK) >> LED_OVER_FREQ_SHIFT;
 701
 702         if (freq) {
 703                 /* For blink, set each phase from one nybble of val */
 704                 ppd->led_override_vals[0] = val & 0xF;
 705                 ppd->led_override_vals[1] = (val >> 4) & 0xF;
 706                 timeoff = (HZ << 4)/freq;
 707         } else {
 708                 /* Non-blink set both phases the same. */
 709                 ppd->led_override_vals[0] = val & 0xF;
 710                 ppd->led_override_vals[1] = val & 0xF;
 711         }
 712         ppd->led_override_timeoff = timeoff;
 713
 714         /*
 715          * If the timer has not already been started, do so. Use a "quick"
 716          * timeout so the function will be called soon, to look at our request.
 717          */
 718         if (atomic_inc_return(&ppd->led_override_timer_active) == 1) {
 719                 /* Need to start timer */
 720                 timer_setup(&ppd->led_override_timer, qib_run_led_override, 0);
 721                 ppd->led_override_timer.expires = jiffies + 1;
 722                 add_timer(&ppd->led_override_timer);
 723         } else {
 724                 if (ppd->led_override_vals[0] || ppd->led_override_vals[1])
 725                         mod_timer(&ppd->led_override_timer, jiffies + 1);
 726                 atomic_dec(&ppd->led_override_timer_active);
 727         }
 728 }
 729
 730 /**
 731  * qib_reset_device - reset the chip if possible
 732  * @unit: the device to reset
 733  *
 734  * Whether or not reset is successful, we attempt to re-initialize the chip
 735  * (that is, much like a driver unload/reload).  We clear the INITTED flag
 736  * so that the various entry points will fail until we reinitialize.  For
 737  * now, we only allow this if no user contexts are open that use chip resources
 738  */
 739 int qib_reset_device(int unit)
 740 {
 741         int ret, i;
 742         struct qib_devdata *dd = qib_lookup(unit);
 743         struct qib_pportdata *ppd;
 744         unsigned long flags;
 745         int pidx;
 746
 747         if (!dd) {
 748                 ret = -ENODEV;
 749                 goto bail;
 750         }
 751
 752         qib_devinfo(dd->pcidev, "Reset on unit %u requested\n", unit);
 753
 754         if (!dd->kregbase || !(dd->flags & QIB_PRESENT)) {
 755                 qib_devinfo(dd->pcidev,
 756                         "Invalid unit number %u or not initialized or not present\n",
 757                         unit);
 758                 ret = -ENXIO;
 759                 goto bail;
 760         }
 761
 762         spin_lock_irqsave(&dd->uctxt_lock, flags);
 763         if (dd->rcd)
 764                 for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) {
 765                         if (!dd->rcd[i] || !dd->rcd[i]->cnt)
 766                                 continue;
 767                         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 768                         ret = -EBUSY;
 769                         goto bail;
 770                 }
 771         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 772
 773         for (pidx = 0; pidx < dd->num_pports; ++pidx) {
 774                 ppd = dd->pport + pidx;
 775                 if (atomic_read(&ppd->led_override_timer_active)) {
 776                         /* Need to stop LED timer, _then_ shut off LEDs */
 777                         del_timer_sync(&ppd->led_override_timer);
 778                         atomic_set(&ppd->led_override_timer_active, 0);
 779                 }
 780
 781                 /* Shut off LEDs after we are sure timer is not running */
 782                 ppd->led_override = LED_OVER_BOTH_OFF;
 783                 dd->f_setextled(ppd, 0);
 784                 if (dd->flags & QIB_HAS_SEND_DMA)
 785                         qib_teardown_sdma(ppd);
 786         }
 787
 788         ret = dd->f_reset(dd);
 789         if (ret == 1)
 790                 ret = qib_init(dd, 1);
 791         else
 792                 ret = -EAGAIN;
 793         if (ret)
 794                 qib_dev_err(dd,
 795                         "Reinitialize unit %u after reset failed with %d\n",
 796                         unit, ret);
 797         else
 798                 qib_devinfo(dd->pcidev,
 799                         "Reinitialized unit %u after resetting\n",
 800                         unit);
 801
 802 bail:
 803         return ret;
 804 }