Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
[linux-2.6] / drivers / infiniband / hw / ipath / ipath_ud.c
1 /*
2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3  * Copyright (c) 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 <rdma/ib_smi.h>
35
36 #include "ipath_verbs.h"
37 #include "ipath_kernel.h"
38
39 /**
40  * ipath_ud_loopback - handle send on loopback QPs
41  * @sqp: the sending QP
42  * @swqe: the send work request
43  *
44  * This is called from ipath_make_ud_req() to forward a WQE addressed
45  * to the same HCA.
46  * Note that the receive interrupt handler may be calling ipath_ud_rcv()
47  * while this is being called.
48  */
49 static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
50 {
51         struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
52         struct ipath_qp *qp;
53         struct ib_ah_attr *ah_attr;
54         unsigned long flags;
55         struct ipath_rq *rq;
56         struct ipath_srq *srq;
57         struct ipath_sge_state rsge;
58         struct ipath_sge *sge;
59         struct ipath_rwq *wq;
60         struct ipath_rwqe *wqe;
61         void (*handler)(struct ib_event *, void *);
62         struct ib_wc wc;
63         u32 tail;
64         u32 rlen;
65         u32 length;
66
67         qp = ipath_lookup_qpn(&dev->qp_table, swqe->wr.wr.ud.remote_qpn);
68         if (!qp || !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
69                 dev->n_pkt_drops++;
70                 goto done;
71         }
72
73         /*
74          * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
75          * Qkeys with the high order bit set mean use the
76          * qkey from the QP context instead of the WR (see 10.2.5).
77          */
78         if (unlikely(qp->ibqp.qp_num &&
79                      ((int) swqe->wr.wr.ud.remote_qkey < 0 ?
80                       sqp->qkey : swqe->wr.wr.ud.remote_qkey) != qp->qkey)) {
81                 /* XXX OK to lose a count once in a while. */
82                 dev->qkey_violations++;
83                 dev->n_pkt_drops++;
84                 goto drop;
85         }
86
87         /*
88          * A GRH is expected to preceed the data even if not
89          * present on the wire.
90          */
91         length = swqe->length;
92         memset(&wc, 0, sizeof wc);
93         wc.byte_len = length + sizeof(struct ib_grh);
94
95         if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
96                 wc.wc_flags = IB_WC_WITH_IMM;
97                 wc.ex.imm_data = swqe->wr.ex.imm_data;
98         }
99
100         /*
101          * This would be a lot simpler if we could call ipath_get_rwqe()
102          * but that uses state that the receive interrupt handler uses
103          * so we would need to lock out receive interrupts while doing
104          * local loopback.
105          */
106         if (qp->ibqp.srq) {
107                 srq = to_isrq(qp->ibqp.srq);
108                 handler = srq->ibsrq.event_handler;
109                 rq = &srq->rq;
110         } else {
111                 srq = NULL;
112                 handler = NULL;
113                 rq = &qp->r_rq;
114         }
115
116         /*
117          * Get the next work request entry to find where to put the data.
118          * Note that it is safe to drop the lock after changing rq->tail
119          * since ipath_post_receive() won't fill the empty slot.
120          */
121         spin_lock_irqsave(&rq->lock, flags);
122         wq = rq->wq;
123         tail = wq->tail;
124         /* Validate tail before using it since it is user writable. */
125         if (tail >= rq->size)
126                 tail = 0;
127         if (unlikely(tail == wq->head)) {
128                 spin_unlock_irqrestore(&rq->lock, flags);
129                 dev->n_pkt_drops++;
130                 goto drop;
131         }
132         wqe = get_rwqe_ptr(rq, tail);
133         rsge.sg_list = qp->r_ud_sg_list;
134         if (!ipath_init_sge(qp, wqe, &rlen, &rsge)) {
135                 spin_unlock_irqrestore(&rq->lock, flags);
136                 dev->n_pkt_drops++;
137                 goto drop;
138         }
139         /* Silently drop packets which are too big. */
140         if (wc.byte_len > rlen) {
141                 spin_unlock_irqrestore(&rq->lock, flags);
142                 dev->n_pkt_drops++;
143                 goto drop;
144         }
145         if (++tail >= rq->size)
146                 tail = 0;
147         wq->tail = tail;
148         wc.wr_id = wqe->wr_id;
149         if (handler) {
150                 u32 n;
151
152                 /*
153                  * validate head pointer value and compute
154                  * the number of remaining WQEs.
155                  */
156                 n = wq->head;
157                 if (n >= rq->size)
158                         n = 0;
159                 if (n < tail)
160                         n += rq->size - tail;
161                 else
162                         n -= tail;
163                 if (n < srq->limit) {
164                         struct ib_event ev;
165
166                         srq->limit = 0;
167                         spin_unlock_irqrestore(&rq->lock, flags);
168                         ev.device = qp->ibqp.device;
169                         ev.element.srq = qp->ibqp.srq;
170                         ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
171                         handler(&ev, srq->ibsrq.srq_context);
172                 } else
173                         spin_unlock_irqrestore(&rq->lock, flags);
174         } else
175                 spin_unlock_irqrestore(&rq->lock, flags);
176
177         ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr;
178         if (ah_attr->ah_flags & IB_AH_GRH) {
179                 ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh));
180                 wc.wc_flags |= IB_WC_GRH;
181         } else
182                 ipath_skip_sge(&rsge, sizeof(struct ib_grh));
183         sge = swqe->sg_list;
184         while (length) {
185                 u32 len = sge->length;
186
187                 if (len > length)
188                         len = length;
189                 if (len > sge->sge_length)
190                         len = sge->sge_length;
191                 BUG_ON(len == 0);
192                 ipath_copy_sge(&rsge, sge->vaddr, len);
193                 sge->vaddr += len;
194                 sge->length -= len;
195                 sge->sge_length -= len;
196                 if (sge->sge_length == 0) {
197                         if (--swqe->wr.num_sge)
198                                 sge++;
199                 } else if (sge->length == 0 && sge->mr != NULL) {
200                         if (++sge->n >= IPATH_SEGSZ) {
201                                 if (++sge->m >= sge->mr->mapsz)
202                                         break;
203                                 sge->n = 0;
204                         }
205                         sge->vaddr =
206                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
207                         sge->length =
208                                 sge->mr->map[sge->m]->segs[sge->n].length;
209                 }
210                 length -= len;
211         }
212         wc.status = IB_WC_SUCCESS;
213         wc.opcode = IB_WC_RECV;
214         wc.qp = &qp->ibqp;
215         wc.src_qp = sqp->ibqp.qp_num;
216         /* XXX do we know which pkey matched? Only needed for GSI. */
217         wc.pkey_index = 0;
218         wc.slid = dev->dd->ipath_lid |
219                 (ah_attr->src_path_bits &
220                  ((1 << dev->dd->ipath_lmc) - 1));
221         wc.sl = ah_attr->sl;
222         wc.dlid_path_bits =
223                 ah_attr->dlid & ((1 << dev->dd->ipath_lmc) - 1);
224         wc.port_num = 1;
225         /* Signal completion event if the solicited bit is set. */
226         ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
227                        swqe->wr.send_flags & IB_SEND_SOLICITED);
228 drop:
229         if (atomic_dec_and_test(&qp->refcount))
230                 wake_up(&qp->wait);
231 done:;
232 }
233
234 /**
235  * ipath_make_ud_req - construct a UD request packet
236  * @qp: the QP
237  *
238  * Return 1 if constructed; otherwise, return 0.
239  */
240 int ipath_make_ud_req(struct ipath_qp *qp)
241 {
242         struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
243         struct ipath_other_headers *ohdr;
244         struct ib_ah_attr *ah_attr;
245         struct ipath_swqe *wqe;
246         unsigned long flags;
247         u32 nwords;
248         u32 extra_bytes;
249         u32 bth0;
250         u16 lrh0;
251         u16 lid;
252         int ret = 0;
253         int next_cur;
254
255         spin_lock_irqsave(&qp->s_lock, flags);
256
257         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_NEXT_SEND_OK)) {
258                 if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND))
259                         goto bail;
260                 /* We are in the error state, flush the work request. */
261                 if (qp->s_last == qp->s_head)
262                         goto bail;
263                 /* If DMAs are in progress, we can't flush immediately. */
264                 if (atomic_read(&qp->s_dma_busy)) {
265                         qp->s_flags |= IPATH_S_WAIT_DMA;
266                         goto bail;
267                 }
268                 wqe = get_swqe_ptr(qp, qp->s_last);
269                 ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
270                 goto done;
271         }
272
273         if (qp->s_cur == qp->s_head)
274                 goto bail;
275
276         wqe = get_swqe_ptr(qp, qp->s_cur);
277         next_cur = qp->s_cur + 1;
278         if (next_cur >= qp->s_size)
279                 next_cur = 0;
280
281         /* Construct the header. */
282         ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr;
283         if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) {
284                 if (ah_attr->dlid != IPATH_PERMISSIVE_LID)
285                         dev->n_multicast_xmit++;
286                 else
287                         dev->n_unicast_xmit++;
288         } else {
289                 dev->n_unicast_xmit++;
290                 lid = ah_attr->dlid & ~((1 << dev->dd->ipath_lmc) - 1);
291                 if (unlikely(lid == dev->dd->ipath_lid)) {
292                         /*
293                          * If DMAs are in progress, we can't generate
294                          * a completion for the loopback packet since
295                          * it would be out of order.
296                          * XXX Instead of waiting, we could queue a
297                          * zero length descriptor so we get a callback.
298                          */
299                         if (atomic_read(&qp->s_dma_busy)) {
300                                 qp->s_flags |= IPATH_S_WAIT_DMA;
301                                 goto bail;
302                         }
303                         qp->s_cur = next_cur;
304                         spin_unlock_irqrestore(&qp->s_lock, flags);
305                         ipath_ud_loopback(qp, wqe);
306                         spin_lock_irqsave(&qp->s_lock, flags);
307                         ipath_send_complete(qp, wqe, IB_WC_SUCCESS);
308                         goto done;
309                 }
310         }
311
312         qp->s_cur = next_cur;
313         extra_bytes = -wqe->length & 3;
314         nwords = (wqe->length + extra_bytes) >> 2;
315
316         /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */
317         qp->s_hdrwords = 7;
318         qp->s_cur_size = wqe->length;
319         qp->s_cur_sge = &qp->s_sge;
320         qp->s_dmult = ah_attr->static_rate;
321         qp->s_wqe = wqe;
322         qp->s_sge.sge = wqe->sg_list[0];
323         qp->s_sge.sg_list = wqe->sg_list + 1;
324         qp->s_sge.num_sge = wqe->wr.num_sge;
325
326         if (ah_attr->ah_flags & IB_AH_GRH) {
327                 /* Header size in 32-bit words. */
328                 qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
329                                                  &ah_attr->grh,
330                                                  qp->s_hdrwords, nwords);
331                 lrh0 = IPATH_LRH_GRH;
332                 ohdr = &qp->s_hdr.u.l.oth;
333                 /*
334                  * Don't worry about sending to locally attached multicast
335                  * QPs.  It is unspecified by the spec. what happens.
336                  */
337         } else {
338                 /* Header size in 32-bit words. */
339                 lrh0 = IPATH_LRH_BTH;
340                 ohdr = &qp->s_hdr.u.oth;
341         }
342         if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
343                 qp->s_hdrwords++;
344                 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
345                 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
346         } else
347                 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
348         lrh0 |= ah_attr->sl << 4;
349         if (qp->ibqp.qp_type == IB_QPT_SMI)
350                 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
351         qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
352         qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid);  /* DEST LID */
353         qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
354                                            SIZE_OF_CRC);
355         lid = dev->dd->ipath_lid;
356         if (lid) {
357                 lid |= ah_attr->src_path_bits &
358                         ((1 << dev->dd->ipath_lmc) - 1);
359                 qp->s_hdr.lrh[3] = cpu_to_be16(lid);
360         } else
361                 qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE;
362         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
363                 bth0 |= 1 << 23;
364         bth0 |= extra_bytes << 20;
365         bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY :
366                 ipath_get_pkey(dev->dd, qp->s_pkey_index);
367         ohdr->bth[0] = cpu_to_be32(bth0);
368         /*
369          * Use the multicast QP if the destination LID is a multicast LID.
370          */
371         ohdr->bth[1] = ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
372                 ah_attr->dlid != IPATH_PERMISSIVE_LID ?
373                 cpu_to_be32(IPATH_MULTICAST_QPN) :
374                 cpu_to_be32(wqe->wr.wr.ud.remote_qpn);
375         ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_PSN_MASK);
376         /*
377          * Qkeys with the high order bit set mean use the
378          * qkey from the QP context instead of the WR (see 10.2.5).
379          */
380         ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ?
381                                          qp->qkey : wqe->wr.wr.ud.remote_qkey);
382         ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
383
384 done:
385         ret = 1;
386         goto unlock;
387
388 bail:
389         qp->s_flags &= ~IPATH_S_BUSY;
390 unlock:
391         spin_unlock_irqrestore(&qp->s_lock, flags);
392         return ret;
393 }
394
395 /**
396  * ipath_ud_rcv - receive an incoming UD packet
397  * @dev: the device the packet came in on
398  * @hdr: the packet header
399  * @has_grh: true if the packet has a GRH
400  * @data: the packet data
401  * @tlen: the packet length
402  * @qp: the QP the packet came on
403  *
404  * This is called from ipath_qp_rcv() to process an incoming UD packet
405  * for the given QP.
406  * Called at interrupt level.
407  */
408 void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
409                   int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
410 {
411         struct ipath_other_headers *ohdr;
412         int opcode;
413         u32 hdrsize;
414         u32 pad;
415         struct ib_wc wc;
416         u32 qkey;
417         u32 src_qp;
418         u16 dlid;
419         int header_in_data;
420
421         /* Check for GRH */
422         if (!has_grh) {
423                 ohdr = &hdr->u.oth;
424                 hdrsize = 8 + 12 + 8;   /* LRH + BTH + DETH */
425                 qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
426                 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]);
427                 header_in_data = 0;
428         } else {
429                 ohdr = &hdr->u.l.oth;
430                 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
431                 /*
432                  * The header with GRH is 68 bytes and the core driver sets
433                  * the eager header buffer size to 56 bytes so the last 12
434                  * bytes of the IB header is in the data buffer.
435                  */
436                 header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
437                 if (header_in_data) {
438                         qkey = be32_to_cpu(((__be32 *) data)[1]);
439                         src_qp = be32_to_cpu(((__be32 *) data)[2]);
440                         data += 12;
441                 } else {
442                         qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
443                         src_qp = be32_to_cpu(ohdr->u.ud.deth[1]);
444                 }
445         }
446         src_qp &= IPATH_QPN_MASK;
447
448         /*
449          * Check that the permissive LID is only used on QP0
450          * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
451          */
452         if (qp->ibqp.qp_num) {
453                 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||
454                              hdr->lrh[3] == IB_LID_PERMISSIVE)) {
455                         dev->n_pkt_drops++;
456                         goto bail;
457                 }
458                 if (unlikely(qkey != qp->qkey)) {
459                         /* XXX OK to lose a count once in a while. */
460                         dev->qkey_violations++;
461                         dev->n_pkt_drops++;
462                         goto bail;
463                 }
464         } else if (hdr->lrh[1] == IB_LID_PERMISSIVE ||
465                    hdr->lrh[3] == IB_LID_PERMISSIVE) {
466                 struct ib_smp *smp = (struct ib_smp *) data;
467
468                 if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
469                         dev->n_pkt_drops++;
470                         goto bail;
471                 }
472         }
473
474         /*
475          * The opcode is in the low byte when its in network order
476          * (top byte when in host order).
477          */
478         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
479         if (qp->ibqp.qp_num > 1 &&
480             opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
481                 if (header_in_data) {
482                         wc.ex.imm_data = *(__be32 *) data;
483                         data += sizeof(__be32);
484                 } else
485                         wc.ex.imm_data = ohdr->u.ud.imm_data;
486                 wc.wc_flags = IB_WC_WITH_IMM;
487                 hdrsize += sizeof(u32);
488         } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
489                 wc.ex.imm_data = 0;
490                 wc.wc_flags = 0;
491         } else {
492                 dev->n_pkt_drops++;
493                 goto bail;
494         }
495
496         /* Get the number of bytes the message was padded by. */
497         pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
498         if (unlikely(tlen < (hdrsize + pad + 4))) {
499                 /* Drop incomplete packets. */
500                 dev->n_pkt_drops++;
501                 goto bail;
502         }
503         tlen -= hdrsize + pad + 4;
504
505         /* Drop invalid MAD packets (see 13.5.3.1). */
506         if (unlikely((qp->ibqp.qp_num == 0 &&
507                       (tlen != 256 ||
508                        (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)) ||
509                      (qp->ibqp.qp_num == 1 &&
510                       (tlen != 256 ||
511                        (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))) {
512                 dev->n_pkt_drops++;
513                 goto bail;
514         }
515
516         /*
517          * A GRH is expected to preceed the data even if not
518          * present on the wire.
519          */
520         wc.byte_len = tlen + sizeof(struct ib_grh);
521
522         /*
523          * Get the next work request entry to find where to put the data.
524          */
525         if (qp->r_flags & IPATH_R_REUSE_SGE)
526                 qp->r_flags &= ~IPATH_R_REUSE_SGE;
527         else if (!ipath_get_rwqe(qp, 0)) {
528                 /*
529                  * Count VL15 packets dropped due to no receive buffer.
530                  * Otherwise, count them as buffer overruns since usually,
531                  * the HW will be able to receive packets even if there are
532                  * no QPs with posted receive buffers.
533                  */
534                 if (qp->ibqp.qp_num == 0)
535                         dev->n_vl15_dropped++;
536                 else
537                         dev->rcv_errors++;
538                 goto bail;
539         }
540         /* Silently drop packets which are too big. */
541         if (wc.byte_len > qp->r_len) {
542                 qp->r_flags |= IPATH_R_REUSE_SGE;
543                 dev->n_pkt_drops++;
544                 goto bail;
545         }
546         if (has_grh) {
547                 ipath_copy_sge(&qp->r_sge, &hdr->u.l.grh,
548                                sizeof(struct ib_grh));
549                 wc.wc_flags |= IB_WC_GRH;
550         } else
551                 ipath_skip_sge(&qp->r_sge, sizeof(struct ib_grh));
552         ipath_copy_sge(&qp->r_sge, data,
553                        wc.byte_len - sizeof(struct ib_grh));
554         if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags))
555                 goto bail;
556         wc.wr_id = qp->r_wr_id;
557         wc.status = IB_WC_SUCCESS;
558         wc.opcode = IB_WC_RECV;
559         wc.vendor_err = 0;
560         wc.qp = &qp->ibqp;
561         wc.src_qp = src_qp;
562         /* XXX do we know which pkey matched? Only needed for GSI. */
563         wc.pkey_index = 0;
564         wc.slid = be16_to_cpu(hdr->lrh[3]);
565         wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;
566         dlid = be16_to_cpu(hdr->lrh[1]);
567         /*
568          * Save the LMC lower bits if the destination LID is a unicast LID.
569          */
570         wc.dlid_path_bits = dlid >= IPATH_MULTICAST_LID_BASE ? 0 :
571                 dlid & ((1 << dev->dd->ipath_lmc) - 1);
572         wc.port_num = 1;
573         /* Signal completion event if the solicited bit is set. */
574         ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
575                        (ohdr->bth[0] &
576                         cpu_to_be32(1 << 23)) != 0);
577
578 bail:;
579 }