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1/*
2 * Copyright (c) 2012 - 2019 Intel Corporation. All rights reserved.
3 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
4 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35#include <rdma/ib_smi.h>
36#include <rdma/ib_verbs.h>
37
38#include "qib.h"
39#include "qib_mad.h"
40
41/**
42 * qib_ud_loopback - handle send on loopback QPs
43 * @sqp: the sending QP
44 * @swqe: the send work request
45 *
46 * This is called from qib_make_ud_req() to forward a WQE addressed
47 * to the same HCA.
48 * Note that the receive interrupt handler may be calling qib_ud_rcv()
49 * while this is being called.
50 */
51static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
52{
53 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
54 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
55 struct qib_devdata *dd = ppd->dd;
56 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
57 struct rvt_qp *qp;
58 struct rdma_ah_attr *ah_attr;
59 unsigned long flags;
60 struct rvt_sge_state ssge;
61 struct rvt_sge *sge;
62 struct ib_wc wc;
63 u32 length;
64 enum ib_qp_type sqptype, dqptype;
65
66 rcu_read_lock();
67 qp = rvt_lookup_qpn(rdi, &ibp->rvp, rvt_get_swqe_remote_qpn(swqe));
68 if (!qp) {
69 ibp->rvp.n_pkt_drops++;
70 goto drop;
71 }
72
73 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
74 IB_QPT_UD : sqp->ibqp.qp_type;
75 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
76 IB_QPT_UD : qp->ibqp.qp_type;
77
78 if (dqptype != sqptype ||
79 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
80 ibp->rvp.n_pkt_drops++;
81 goto drop;
82 }
83
84 ah_attr = rvt_get_swqe_ah_attr(swqe);
85 ppd = ppd_from_ibp(ibp);
86
87 if (qp->ibqp.qp_num > 1) {
88 u16 pkey1;
89 u16 pkey2;
90 u16 lid;
91
92 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index);
93 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
94 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
95 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
96 ((1 << ppd->lmc) - 1));
97 qib_bad_pkey(ibp, pkey1,
98 rdma_ah_get_sl(ah_attr),
99 sqp->ibqp.qp_num, qp->ibqp.qp_num,
100 cpu_to_be16(lid),
101 cpu_to_be16(rdma_ah_get_dlid(ah_attr)));
102 goto drop;
103 }
104 }
105
106 /*
107 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
108 * Qkeys with the high order bit set mean use the
109 * qkey from the QP context instead of the WR (see 10.2.5).
110 */
111 if (qp->ibqp.qp_num) {
112 u32 qkey;
113
114 qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ?
115 sqp->qkey : rvt_get_swqe_remote_qkey(swqe);
116 if (unlikely(qkey != qp->qkey))
117 goto drop;
118 }
119
120 /*
121 * A GRH is expected to precede the data even if not
122 * present on the wire.
123 */
124 length = swqe->length;
125 memset(&wc, 0, sizeof(wc));
126 wc.byte_len = length + sizeof(struct ib_grh);
127
128 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
129 wc.wc_flags = IB_WC_WITH_IMM;
130 wc.ex.imm_data = swqe->wr.ex.imm_data;
131 }
132
133 spin_lock_irqsave(&qp->r_lock, flags);
134
135 /*
136 * Get the next work request entry to find where to put the data.
137 */
138 if (qp->r_flags & RVT_R_REUSE_SGE)
139 qp->r_flags &= ~RVT_R_REUSE_SGE;
140 else {
141 int ret;
142
143 ret = rvt_get_rwqe(qp, false);
144 if (ret < 0) {
145 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
146 goto bail_unlock;
147 }
148 if (!ret) {
149 if (qp->ibqp.qp_num == 0)
150 ibp->rvp.n_vl15_dropped++;
151 goto bail_unlock;
152 }
153 }
154 /* Silently drop packets which are too big. */
155 if (unlikely(wc.byte_len > qp->r_len)) {
156 qp->r_flags |= RVT_R_REUSE_SGE;
157 ibp->rvp.n_pkt_drops++;
158 goto bail_unlock;
159 }
160
161 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
162 struct ib_grh grh;
163 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr);
164
165 qib_make_grh(ibp, &grh, grd, 0, 0);
166 rvt_copy_sge(qp, &qp->r_sge, &grh,
167 sizeof(grh), true, false);
168 wc.wc_flags |= IB_WC_GRH;
169 } else
170 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
171 ssge.sg_list = swqe->sg_list + 1;
172 ssge.sge = *swqe->sg_list;
173 ssge.num_sge = swqe->wr.num_sge;
174 sge = &ssge.sge;
175 while (length) {
176 u32 len = rvt_get_sge_length(sge, length);
177
178 rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
179 sge->vaddr += len;
180 sge->length -= len;
181 sge->sge_length -= len;
182 if (sge->sge_length == 0) {
183 if (--ssge.num_sge)
184 *sge = *ssge.sg_list++;
185 } else if (sge->length == 0 && sge->mr->lkey) {
186 if (++sge->n >= RVT_SEGSZ) {
187 if (++sge->m >= sge->mr->mapsz)
188 break;
189 sge->n = 0;
190 }
191 sge->vaddr =
192 sge->mr->map[sge->m]->segs[sge->n].vaddr;
193 sge->length =
194 sge->mr->map[sge->m]->segs[sge->n].length;
195 }
196 length -= len;
197 }
198 rvt_put_ss(&qp->r_sge);
199 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
200 goto bail_unlock;
201 wc.wr_id = qp->r_wr_id;
202 wc.status = IB_WC_SUCCESS;
203 wc.opcode = IB_WC_RECV;
204 wc.qp = &qp->ibqp;
205 wc.src_qp = sqp->ibqp.qp_num;
206 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
207 rvt_get_swqe_pkey_index(swqe) : 0;
208 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
209 ((1 << ppd->lmc) - 1));
210 wc.sl = rdma_ah_get_sl(ah_attr);
211 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
212 wc.port_num = qp->port_num;
213 /* Signal completion event if the solicited bit is set. */
214 rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED);
215 ibp->rvp.n_loop_pkts++;
216bail_unlock:
217 spin_unlock_irqrestore(&qp->r_lock, flags);
218drop:
219 rcu_read_unlock();
220}
221
222/**
223 * qib_make_ud_req - construct a UD request packet
224 * @qp: the QP
225 * @flags: flags to modify and pass back to caller
226 *
227 * Assumes the s_lock is held.
228 *
229 * Return 1 if constructed; otherwise, return 0.
230 */
231int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags)
232{
233 struct qib_qp_priv *priv = qp->priv;
234 struct ib_other_headers *ohdr;
235 struct rdma_ah_attr *ah_attr;
236 struct qib_pportdata *ppd;
237 struct qib_ibport *ibp;
238 struct rvt_swqe *wqe;
239 u32 nwords;
240 u32 extra_bytes;
241 u32 bth0;
242 u16 lrh0;
243 u16 lid;
244 int ret = 0;
245 int next_cur;
246
247 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
248 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
249 goto bail;
250 /* We are in the error state, flush the work request. */
251 if (qp->s_last == READ_ONCE(qp->s_head))
252 goto bail;
253 /* If DMAs are in progress, we can't flush immediately. */
254 if (atomic_read(&priv->s_dma_busy)) {
255 qp->s_flags |= RVT_S_WAIT_DMA;
256 goto bail;
257 }
258 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
259 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
260 goto done;
261 }
262
263 /* see post_one_send() */
264 if (qp->s_cur == READ_ONCE(qp->s_head))
265 goto bail;
266
267 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
268 next_cur = qp->s_cur + 1;
269 if (next_cur >= qp->s_size)
270 next_cur = 0;
271
272 /* Construct the header. */
273 ibp = to_iport(qp->ibqp.device, qp->port_num);
274 ppd = ppd_from_ibp(ibp);
275 ah_attr = rvt_get_swqe_ah_attr(wqe);
276 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) {
277 if (rdma_ah_get_dlid(ah_attr) !=
278 be16_to_cpu(IB_LID_PERMISSIVE))
279 this_cpu_inc(ibp->pmastats->n_multicast_xmit);
280 else
281 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
282 } else {
283 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
284 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
285 if (unlikely(lid == ppd->lid)) {
286 unsigned long tflags = *flags;
287 /*
288 * If DMAs are in progress, we can't generate
289 * a completion for the loopback packet since
290 * it would be out of order.
291 * XXX Instead of waiting, we could queue a
292 * zero length descriptor so we get a callback.
293 */
294 if (atomic_read(&priv->s_dma_busy)) {
295 qp->s_flags |= RVT_S_WAIT_DMA;
296 goto bail;
297 }
298 qp->s_cur = next_cur;
299 spin_unlock_irqrestore(&qp->s_lock, tflags);
300 qib_ud_loopback(qp, wqe);
301 spin_lock_irqsave(&qp->s_lock, tflags);
302 *flags = tflags;
303 rvt_send_complete(qp, wqe, IB_WC_SUCCESS);
304 goto done;
305 }
306 }
307
308 qp->s_cur = next_cur;
309 extra_bytes = -wqe->length & 3;
310 nwords = (wqe->length + extra_bytes) >> 2;
311
312 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */
313 qp->s_hdrwords = 7;
314 qp->s_cur_size = wqe->length;
315 qp->s_cur_sge = &qp->s_sge;
316 qp->s_srate = rdma_ah_get_static_rate(ah_attr);
317 qp->s_wqe = wqe;
318 qp->s_sge.sge = wqe->sg_list[0];
319 qp->s_sge.sg_list = wqe->sg_list + 1;
320 qp->s_sge.num_sge = wqe->wr.num_sge;
321 qp->s_sge.total_len = wqe->length;
322
323 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
324 /* Header size in 32-bit words. */
325 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
326 rdma_ah_read_grh(ah_attr),
327 qp->s_hdrwords, nwords);
328 lrh0 = QIB_LRH_GRH;
329 ohdr = &priv->s_hdr->u.l.oth;
330 /*
331 * Don't worry about sending to locally attached multicast
332 * QPs. It is unspecified by the spec. what happens.
333 */
334 } else {
335 /* Header size in 32-bit words. */
336 lrh0 = QIB_LRH_BTH;
337 ohdr = &priv->s_hdr->u.oth;
338 }
339 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
340 qp->s_hdrwords++;
341 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
342 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
343 } else
344 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
345 lrh0 |= rdma_ah_get_sl(ah_attr) << 4;
346 if (qp->ibqp.qp_type == IB_QPT_SMI)
347 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
348 else
349 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12;
350 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
351 priv->s_hdr->lrh[1] =
352 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */
353 priv->s_hdr->lrh[2] =
354 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
355 lid = ppd->lid;
356 if (lid) {
357 lid |= rdma_ah_get_path_bits(ah_attr) &
358 ((1 << ppd->lmc) - 1);
359 priv->s_hdr->lrh[3] = cpu_to_be16(lid);
360 } else
361 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE;
362 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
363 bth0 |= IB_BTH_SOLICITED;
364 bth0 |= extra_bytes << 20;
365 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY :
366 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ?
367 rvt_get_swqe_pkey_index(wqe) : qp->s_pkey_index);
368 ohdr->bth[0] = cpu_to_be32(bth0);
369 /*
370 * Use the multicast QP if the destination LID is a multicast LID.
371 */
372 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >=
373 be16_to_cpu(IB_MULTICAST_LID_BASE) &&
374 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ?
375 cpu_to_be32(QIB_MULTICAST_QPN) :
376 cpu_to_be32(rvt_get_swqe_remote_qpn(wqe));
377 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK);
378 /*
379 * Qkeys with the high order bit set mean use the
380 * qkey from the QP context instead of the WR (see 10.2.5).
381 */
382 ohdr->u.ud.deth[0] =
383 cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey :
384 rvt_get_swqe_remote_qkey(wqe));
385 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
386
387done:
388 return 1;
389bail:
390 qp->s_flags &= ~RVT_S_BUSY;
391 return ret;
392}
393
394static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey)
395{
396 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
397 struct qib_devdata *dd = ppd->dd;
398 unsigned ctxt = ppd->hw_pidx;
399 unsigned i;
400
401 pkey &= 0x7fff; /* remove limited/full membership bit */
402
403 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i)
404 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey)
405 return i;
406
407 /*
408 * Should not get here, this means hardware failed to validate pkeys.
409 * Punt and return index 0.
410 */
411 return 0;
412}
413
414/**
415 * qib_ud_rcv - receive an incoming UD packet
416 * @ibp: the port the packet came in on
417 * @hdr: the packet header
418 * @has_grh: true if the packet has a GRH
419 * @data: the packet data
420 * @tlen: the packet length
421 * @qp: the QP the packet came on
422 *
423 * This is called from qib_qp_rcv() to process an incoming UD packet
424 * for the given QP.
425 * Called at interrupt level.
426 */
427void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
428 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
429{
430 struct ib_other_headers *ohdr;
431 int opcode;
432 u32 hdrsize;
433 u32 pad;
434 struct ib_wc wc;
435 u32 qkey;
436 u32 src_qp;
437 u16 dlid;
438
439 /* Check for GRH */
440 if (!has_grh) {
441 ohdr = &hdr->u.oth;
442 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */
443 } else {
444 ohdr = &hdr->u.l.oth;
445 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
446 }
447 qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
448 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;
449
450 /*
451 * Get the number of bytes the message was padded by
452 * and drop incomplete packets.
453 */
454 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
455 if (unlikely(tlen < (hdrsize + pad + 4)))
456 goto drop;
457
458 tlen -= hdrsize + pad + 4;
459
460 /*
461 * Check that the permissive LID is only used on QP0
462 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
463 */
464 if (qp->ibqp.qp_num) {
465 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||
466 hdr->lrh[3] == IB_LID_PERMISSIVE))
467 goto drop;
468 if (qp->ibqp.qp_num > 1) {
469 u16 pkey1, pkey2;
470
471 pkey1 = be32_to_cpu(ohdr->bth[0]);
472 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
473 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
474 qib_bad_pkey(ibp,
475 pkey1,
476 (be16_to_cpu(hdr->lrh[0]) >> 4) &
477 0xF,
478 src_qp, qp->ibqp.qp_num,
479 hdr->lrh[3], hdr->lrh[1]);
480 return;
481 }
482 }
483 if (unlikely(qkey != qp->qkey))
484 return;
485
486 /* Drop invalid MAD packets (see 13.5.3.1). */
487 if (unlikely(qp->ibqp.qp_num == 1 &&
488 (tlen != 256 ||
489 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))
490 goto drop;
491 } else {
492 struct ib_smp *smp;
493
494 /* Drop invalid MAD packets (see 13.5.3.1). */
495 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)
496 goto drop;
497 smp = (struct ib_smp *) data;
498 if ((hdr->lrh[1] == IB_LID_PERMISSIVE ||
499 hdr->lrh[3] == IB_LID_PERMISSIVE) &&
500 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
501 goto drop;
502 }
503
504 /*
505 * The opcode is in the low byte when its in network order
506 * (top byte when in host order).
507 */
508 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
509 if (qp->ibqp.qp_num > 1 &&
510 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
511 wc.ex.imm_data = ohdr->u.ud.imm_data;
512 wc.wc_flags = IB_WC_WITH_IMM;
513 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
514 wc.ex.imm_data = 0;
515 wc.wc_flags = 0;
516 } else
517 goto drop;
518
519 /*
520 * A GRH is expected to precede the data even if not
521 * present on the wire.
522 */
523 wc.byte_len = tlen + sizeof(struct ib_grh);
524
525 /*
526 * Get the next work request entry to find where to put the data.
527 */
528 if (qp->r_flags & RVT_R_REUSE_SGE)
529 qp->r_flags &= ~RVT_R_REUSE_SGE;
530 else {
531 int ret;
532
533 ret = rvt_get_rwqe(qp, false);
534 if (ret < 0) {
535 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
536 return;
537 }
538 if (!ret) {
539 if (qp->ibqp.qp_num == 0)
540 ibp->rvp.n_vl15_dropped++;
541 return;
542 }
543 }
544 /* Silently drop packets which are too big. */
545 if (unlikely(wc.byte_len > qp->r_len)) {
546 qp->r_flags |= RVT_R_REUSE_SGE;
547 goto drop;
548 }
549 if (has_grh) {
550 rvt_copy_sge(qp, &qp->r_sge, &hdr->u.l.grh,
551 sizeof(struct ib_grh), true, false);
552 wc.wc_flags |= IB_WC_GRH;
553 } else
554 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
555 rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
556 true, false);
557 rvt_put_ss(&qp->r_sge);
558 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
559 return;
560 wc.wr_id = qp->r_wr_id;
561 wc.status = IB_WC_SUCCESS;
562 wc.opcode = IB_WC_RECV;
563 wc.vendor_err = 0;
564 wc.qp = &qp->ibqp;
565 wc.src_qp = src_qp;
566 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
567 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0;
568 wc.slid = be16_to_cpu(hdr->lrh[3]);
569 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;
570 dlid = be16_to_cpu(hdr->lrh[1]);
571 /*
572 * Save the LMC lower bits if the destination LID is a unicast LID.
573 */
574 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 :
575 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
576 wc.port_num = qp->port_num;
577 /* Signal completion event if the solicited bit is set. */
578 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr));
579 return;
580
581drop:
582 ibp->rvp.n_pkt_drops++;
583}
1/*
2 * Copyright (c) 2006, 2007, 2008, 2009 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#include <rdma/ib_verbs.h>
36
37#include "qib.h"
38#include "qib_mad.h"
39
40/**
41 * qib_ud_loopback - handle send on loopback QPs
42 * @sqp: the sending QP
43 * @swqe: the send work request
44 *
45 * This is called from qib_make_ud_req() to forward a WQE addressed
46 * to the same HCA.
47 * Note that the receive interrupt handler may be calling qib_ud_rcv()
48 * while this is being called.
49 */
50static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
51{
52 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
53 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
54 struct qib_devdata *dd = ppd->dd;
55 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
56 struct rvt_qp *qp;
57 struct rdma_ah_attr *ah_attr;
58 unsigned long flags;
59 struct rvt_sge_state ssge;
60 struct rvt_sge *sge;
61 struct ib_wc wc;
62 u32 length;
63 enum ib_qp_type sqptype, dqptype;
64
65 rcu_read_lock();
66 qp = rvt_lookup_qpn(rdi, &ibp->rvp, swqe->ud_wr.remote_qpn);
67 if (!qp) {
68 ibp->rvp.n_pkt_drops++;
69 goto drop;
70 }
71
72 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
73 IB_QPT_UD : sqp->ibqp.qp_type;
74 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
75 IB_QPT_UD : qp->ibqp.qp_type;
76
77 if (dqptype != sqptype ||
78 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
79 ibp->rvp.n_pkt_drops++;
80 goto drop;
81 }
82
83 ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr;
84 ppd = ppd_from_ibp(ibp);
85
86 if (qp->ibqp.qp_num > 1) {
87 u16 pkey1;
88 u16 pkey2;
89 u16 lid;
90
91 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index);
92 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
93 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
94 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
95 ((1 << ppd->lmc) - 1));
96 qib_bad_pkey(ibp, pkey1,
97 rdma_ah_get_sl(ah_attr),
98 sqp->ibqp.qp_num, qp->ibqp.qp_num,
99 cpu_to_be16(lid),
100 cpu_to_be16(rdma_ah_get_dlid(ah_attr)));
101 goto drop;
102 }
103 }
104
105 /*
106 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
107 * Qkeys with the high order bit set mean use the
108 * qkey from the QP context instead of the WR (see 10.2.5).
109 */
110 if (qp->ibqp.qp_num) {
111 u32 qkey;
112
113 qkey = (int)swqe->ud_wr.remote_qkey < 0 ?
114 sqp->qkey : swqe->ud_wr.remote_qkey;
115 if (unlikely(qkey != qp->qkey))
116 goto drop;
117 }
118
119 /*
120 * A GRH is expected to precede the data even if not
121 * present on the wire.
122 */
123 length = swqe->length;
124 memset(&wc, 0, sizeof(wc));
125 wc.byte_len = length + sizeof(struct ib_grh);
126
127 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
128 wc.wc_flags = IB_WC_WITH_IMM;
129 wc.ex.imm_data = swqe->wr.ex.imm_data;
130 }
131
132 spin_lock_irqsave(&qp->r_lock, flags);
133
134 /*
135 * Get the next work request entry to find where to put the data.
136 */
137 if (qp->r_flags & RVT_R_REUSE_SGE)
138 qp->r_flags &= ~RVT_R_REUSE_SGE;
139 else {
140 int ret;
141
142 ret = qib_get_rwqe(qp, 0);
143 if (ret < 0) {
144 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
145 goto bail_unlock;
146 }
147 if (!ret) {
148 if (qp->ibqp.qp_num == 0)
149 ibp->rvp.n_vl15_dropped++;
150 goto bail_unlock;
151 }
152 }
153 /* Silently drop packets which are too big. */
154 if (unlikely(wc.byte_len > qp->r_len)) {
155 qp->r_flags |= RVT_R_REUSE_SGE;
156 ibp->rvp.n_pkt_drops++;
157 goto bail_unlock;
158 }
159
160 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
161 struct ib_grh grh;
162 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr);
163
164 qib_make_grh(ibp, &grh, grd, 0, 0);
165 qib_copy_sge(&qp->r_sge, &grh,
166 sizeof(grh), 1);
167 wc.wc_flags |= IB_WC_GRH;
168 } else
169 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
170 ssge.sg_list = swqe->sg_list + 1;
171 ssge.sge = *swqe->sg_list;
172 ssge.num_sge = swqe->wr.num_sge;
173 sge = &ssge.sge;
174 while (length) {
175 u32 len = sge->length;
176
177 if (len > length)
178 len = length;
179 if (len > sge->sge_length)
180 len = sge->sge_length;
181 BUG_ON(len == 0);
182 qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1);
183 sge->vaddr += len;
184 sge->length -= len;
185 sge->sge_length -= len;
186 if (sge->sge_length == 0) {
187 if (--ssge.num_sge)
188 *sge = *ssge.sg_list++;
189 } else if (sge->length == 0 && sge->mr->lkey) {
190 if (++sge->n >= RVT_SEGSZ) {
191 if (++sge->m >= sge->mr->mapsz)
192 break;
193 sge->n = 0;
194 }
195 sge->vaddr =
196 sge->mr->map[sge->m]->segs[sge->n].vaddr;
197 sge->length =
198 sge->mr->map[sge->m]->segs[sge->n].length;
199 }
200 length -= len;
201 }
202 rvt_put_ss(&qp->r_sge);
203 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
204 goto bail_unlock;
205 wc.wr_id = qp->r_wr_id;
206 wc.status = IB_WC_SUCCESS;
207 wc.opcode = IB_WC_RECV;
208 wc.qp = &qp->ibqp;
209 wc.src_qp = sqp->ibqp.qp_num;
210 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
211 swqe->ud_wr.pkey_index : 0;
212 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
213 ((1 << ppd->lmc) - 1));
214 wc.sl = rdma_ah_get_sl(ah_attr);
215 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
216 wc.port_num = qp->port_num;
217 /* Signal completion event if the solicited bit is set. */
218 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
219 swqe->wr.send_flags & IB_SEND_SOLICITED);
220 ibp->rvp.n_loop_pkts++;
221bail_unlock:
222 spin_unlock_irqrestore(&qp->r_lock, flags);
223drop:
224 rcu_read_unlock();
225}
226
227/**
228 * qib_make_ud_req - construct a UD request packet
229 * @qp: the QP
230 *
231 * Assumes the s_lock is held.
232 *
233 * Return 1 if constructed; otherwise, return 0.
234 */
235int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags)
236{
237 struct qib_qp_priv *priv = qp->priv;
238 struct ib_other_headers *ohdr;
239 struct rdma_ah_attr *ah_attr;
240 struct qib_pportdata *ppd;
241 struct qib_ibport *ibp;
242 struct rvt_swqe *wqe;
243 u32 nwords;
244 u32 extra_bytes;
245 u32 bth0;
246 u16 lrh0;
247 u16 lid;
248 int ret = 0;
249 int next_cur;
250
251 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
252 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
253 goto bail;
254 /* We are in the error state, flush the work request. */
255 if (qp->s_last == READ_ONCE(qp->s_head))
256 goto bail;
257 /* If DMAs are in progress, we can't flush immediately. */
258 if (atomic_read(&priv->s_dma_busy)) {
259 qp->s_flags |= RVT_S_WAIT_DMA;
260 goto bail;
261 }
262 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
263 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
264 goto done;
265 }
266
267 /* see post_one_send() */
268 if (qp->s_cur == READ_ONCE(qp->s_head))
269 goto bail;
270
271 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
272 next_cur = qp->s_cur + 1;
273 if (next_cur >= qp->s_size)
274 next_cur = 0;
275
276 /* Construct the header. */
277 ibp = to_iport(qp->ibqp.device, qp->port_num);
278 ppd = ppd_from_ibp(ibp);
279 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
280 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) {
281 if (rdma_ah_get_dlid(ah_attr) !=
282 be16_to_cpu(IB_LID_PERMISSIVE))
283 this_cpu_inc(ibp->pmastats->n_multicast_xmit);
284 else
285 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
286 } else {
287 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
288 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
289 if (unlikely(lid == ppd->lid)) {
290 unsigned long tflags = *flags;
291 /*
292 * If DMAs are in progress, we can't generate
293 * a completion for the loopback packet since
294 * it would be out of order.
295 * XXX Instead of waiting, we could queue a
296 * zero length descriptor so we get a callback.
297 */
298 if (atomic_read(&priv->s_dma_busy)) {
299 qp->s_flags |= RVT_S_WAIT_DMA;
300 goto bail;
301 }
302 qp->s_cur = next_cur;
303 spin_unlock_irqrestore(&qp->s_lock, tflags);
304 qib_ud_loopback(qp, wqe);
305 spin_lock_irqsave(&qp->s_lock, tflags);
306 *flags = tflags;
307 qib_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_srate = rdma_ah_get_static_rate(ah_attr);
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 qp->s_sge.total_len = wqe->length;
326
327 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
328 /* Header size in 32-bit words. */
329 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
330 rdma_ah_read_grh(ah_attr),
331 qp->s_hdrwords, nwords);
332 lrh0 = QIB_LRH_GRH;
333 ohdr = &priv->s_hdr->u.l.oth;
334 /*
335 * Don't worry about sending to locally attached multicast
336 * QPs. It is unspecified by the spec. what happens.
337 */
338 } else {
339 /* Header size in 32-bit words. */
340 lrh0 = QIB_LRH_BTH;
341 ohdr = &priv->s_hdr->u.oth;
342 }
343 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
344 qp->s_hdrwords++;
345 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
346 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
347 } else
348 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
349 lrh0 |= rdma_ah_get_sl(ah_attr) << 4;
350 if (qp->ibqp.qp_type == IB_QPT_SMI)
351 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
352 else
353 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12;
354 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
355 priv->s_hdr->lrh[1] =
356 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */
357 priv->s_hdr->lrh[2] =
358 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
359 lid = ppd->lid;
360 if (lid) {
361 lid |= rdma_ah_get_path_bits(ah_attr) &
362 ((1 << ppd->lmc) - 1);
363 priv->s_hdr->lrh[3] = cpu_to_be16(lid);
364 } else
365 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE;
366 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
367 bth0 |= IB_BTH_SOLICITED;
368 bth0 |= extra_bytes << 20;
369 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY :
370 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ?
371 wqe->ud_wr.pkey_index : qp->s_pkey_index);
372 ohdr->bth[0] = cpu_to_be32(bth0);
373 /*
374 * Use the multicast QP if the destination LID is a multicast LID.
375 */
376 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >=
377 be16_to_cpu(IB_MULTICAST_LID_BASE) &&
378 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ?
379 cpu_to_be32(QIB_MULTICAST_QPN) :
380 cpu_to_be32(wqe->ud_wr.remote_qpn);
381 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK);
382 /*
383 * Qkeys with the high order bit set mean use the
384 * qkey from the QP context instead of the WR (see 10.2.5).
385 */
386 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ?
387 qp->qkey : wqe->ud_wr.remote_qkey);
388 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
389
390done:
391 return 1;
392bail:
393 qp->s_flags &= ~RVT_S_BUSY;
394 return ret;
395}
396
397static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey)
398{
399 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
400 struct qib_devdata *dd = ppd->dd;
401 unsigned ctxt = ppd->hw_pidx;
402 unsigned i;
403
404 pkey &= 0x7fff; /* remove limited/full membership bit */
405
406 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i)
407 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey)
408 return i;
409
410 /*
411 * Should not get here, this means hardware failed to validate pkeys.
412 * Punt and return index 0.
413 */
414 return 0;
415}
416
417/**
418 * qib_ud_rcv - receive an incoming UD packet
419 * @ibp: the port the packet came in on
420 * @hdr: the packet header
421 * @has_grh: true if the packet has a GRH
422 * @data: the packet data
423 * @tlen: the packet length
424 * @qp: the QP the packet came on
425 *
426 * This is called from qib_qp_rcv() to process an incoming UD packet
427 * for the given QP.
428 * Called at interrupt level.
429 */
430void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
431 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
432{
433 struct ib_other_headers *ohdr;
434 int opcode;
435 u32 hdrsize;
436 u32 pad;
437 struct ib_wc wc;
438 u32 qkey;
439 u32 src_qp;
440 u16 dlid;
441
442 /* Check for GRH */
443 if (!has_grh) {
444 ohdr = &hdr->u.oth;
445 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */
446 } else {
447 ohdr = &hdr->u.l.oth;
448 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
449 }
450 qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
451 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;
452
453 /*
454 * Get the number of bytes the message was padded by
455 * and drop incomplete packets.
456 */
457 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
458 if (unlikely(tlen < (hdrsize + pad + 4)))
459 goto drop;
460
461 tlen -= hdrsize + pad + 4;
462
463 /*
464 * Check that the permissive LID is only used on QP0
465 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
466 */
467 if (qp->ibqp.qp_num) {
468 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||
469 hdr->lrh[3] == IB_LID_PERMISSIVE))
470 goto drop;
471 if (qp->ibqp.qp_num > 1) {
472 u16 pkey1, pkey2;
473
474 pkey1 = be32_to_cpu(ohdr->bth[0]);
475 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
476 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
477 qib_bad_pkey(ibp,
478 pkey1,
479 (be16_to_cpu(hdr->lrh[0]) >> 4) &
480 0xF,
481 src_qp, qp->ibqp.qp_num,
482 hdr->lrh[3], hdr->lrh[1]);
483 return;
484 }
485 }
486 if (unlikely(qkey != qp->qkey))
487 return;
488
489 /* Drop invalid MAD packets (see 13.5.3.1). */
490 if (unlikely(qp->ibqp.qp_num == 1 &&
491 (tlen != 256 ||
492 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))
493 goto drop;
494 } else {
495 struct ib_smp *smp;
496
497 /* Drop invalid MAD packets (see 13.5.3.1). */
498 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)
499 goto drop;
500 smp = (struct ib_smp *) data;
501 if ((hdr->lrh[1] == IB_LID_PERMISSIVE ||
502 hdr->lrh[3] == IB_LID_PERMISSIVE) &&
503 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
504 goto drop;
505 }
506
507 /*
508 * The opcode is in the low byte when its in network order
509 * (top byte when in host order).
510 */
511 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
512 if (qp->ibqp.qp_num > 1 &&
513 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
514 wc.ex.imm_data = ohdr->u.ud.imm_data;
515 wc.wc_flags = IB_WC_WITH_IMM;
516 tlen -= sizeof(u32);
517 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
518 wc.ex.imm_data = 0;
519 wc.wc_flags = 0;
520 } else
521 goto drop;
522
523 /*
524 * A GRH is expected to precede the data even if not
525 * present on the wire.
526 */
527 wc.byte_len = tlen + sizeof(struct ib_grh);
528
529 /*
530 * Get the next work request entry to find where to put the data.
531 */
532 if (qp->r_flags & RVT_R_REUSE_SGE)
533 qp->r_flags &= ~RVT_R_REUSE_SGE;
534 else {
535 int ret;
536
537 ret = qib_get_rwqe(qp, 0);
538 if (ret < 0) {
539 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
540 return;
541 }
542 if (!ret) {
543 if (qp->ibqp.qp_num == 0)
544 ibp->rvp.n_vl15_dropped++;
545 return;
546 }
547 }
548 /* Silently drop packets which are too big. */
549 if (unlikely(wc.byte_len > qp->r_len)) {
550 qp->r_flags |= RVT_R_REUSE_SGE;
551 goto drop;
552 }
553 if (has_grh) {
554 qib_copy_sge(&qp->r_sge, &hdr->u.l.grh,
555 sizeof(struct ib_grh), 1);
556 wc.wc_flags |= IB_WC_GRH;
557 } else
558 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
559 qib_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1);
560 rvt_put_ss(&qp->r_sge);
561 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
562 return;
563 wc.wr_id = qp->r_wr_id;
564 wc.status = IB_WC_SUCCESS;
565 wc.opcode = IB_WC_RECV;
566 wc.vendor_err = 0;
567 wc.qp = &qp->ibqp;
568 wc.src_qp = src_qp;
569 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
570 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0;
571 wc.slid = be16_to_cpu(hdr->lrh[3]);
572 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;
573 dlid = be16_to_cpu(hdr->lrh[1]);
574 /*
575 * Save the LMC lower bits if the destination LID is a unicast LID.
576 */
577 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 :
578 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
579 wc.port_num = qp->port_num;
580 /* Signal completion event if the solicited bit is set. */
581 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
582 ib_bth_is_solicited(ohdr));
583 return;
584
585drop:
586 ibp->rvp.n_pkt_drops++;
587}