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