summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/hfi1/uc.c
blob: b7b671017e594298c8bea18d029fbd1154a8cfe9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "hfi.h"
#include "verbs_txreq.h"
#include "qp.h"

/* cut down ridiculously long IB macro names */
#define OP(x) UC_OP(x)

/**
 * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
 * @qp: a pointer to the QP
 *
 * Assume s_lock is held.
 *
 * Return 1 if constructed; otherwise, return 0.
 */
int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
{
	struct hfi1_qp_priv *priv = qp->priv;
	struct ib_other_headers *ohdr;
	struct rvt_swqe *wqe;
	u32 hwords;
	u32 bth0 = 0;
	u32 len;
	u32 pmtu = qp->pmtu;
	int middle = 0;

	ps->s_txreq = get_txreq(ps->dev, qp);
	if (IS_ERR(ps->s_txreq))
		goto bail_no_tx;

	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
		if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
			goto bail;
		/* We are in the error state, flush the work request. */
		if (qp->s_last == READ_ONCE(qp->s_head))
			goto bail;
		/* If DMAs are in progress, we can't flush immediately. */
		if (iowait_sdma_pending(&priv->s_iowait)) {
			qp->s_flags |= RVT_S_WAIT_DMA;
			goto bail;
		}
		clear_ahg(qp);
		wqe = rvt_get_swqe_ptr(qp, qp->s_last);
		hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
		goto done_free_tx;
	}

	if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
		/* header size in 32-bit words LRH+BTH = (8+12)/4. */
		hwords = 5;
		if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
			ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
		else
			ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
	} else {
		/* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
		hwords = 7;
		if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
		    (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
			ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
		else
			ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
	}

	/* Get the next send request. */
	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
	qp->s_wqe = NULL;
	switch (qp->s_state) {
	default:
		if (!(ib_rvt_state_ops[qp->state] &
		    RVT_PROCESS_NEXT_SEND_OK))
			goto bail;
		/* Check if send work queue is empty. */
		if (qp->s_cur == READ_ONCE(qp->s_head)) {
			clear_ahg(qp);
			goto bail;
		}
		/*
		 * Local operations are processed immediately
		 * after all prior requests have completed.
		 */
		if (wqe->wr.opcode == IB_WR_REG_MR ||
		    wqe->wr.opcode == IB_WR_LOCAL_INV) {
			int local_ops = 0;
			int err = 0;

			if (qp->s_last != qp->s_cur)
				goto bail;
			if (++qp->s_cur == qp->s_size)
				qp->s_cur = 0;
			if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
				err = rvt_invalidate_rkey(
					qp, wqe->wr.ex.invalidate_rkey);
				local_ops = 1;
			}
			hfi1_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR
							: IB_WC_SUCCESS);
			if (local_ops)
				atomic_dec(&qp->local_ops_pending);
			goto done_free_tx;
		}
		/*
		 * Start a new request.
		 */
		qp->s_psn = wqe->psn;
		qp->s_sge.sge = wqe->sg_list[0];
		qp->s_sge.sg_list = wqe->sg_list + 1;
		qp->s_sge.num_sge = wqe->wr.num_sge;
		qp->s_sge.total_len = wqe->length;
		len = wqe->length;
		qp->s_len = len;
		switch (wqe->wr.opcode) {
		case IB_WR_SEND:
		case IB_WR_SEND_WITH_IMM:
			if (len > pmtu) {
				qp->s_state = OP(SEND_FIRST);
				len = pmtu;
				break;
			}
			if (wqe->wr.opcode == IB_WR_SEND) {
				qp->s_state = OP(SEND_ONLY);
			} else {
				qp->s_state =
					OP(SEND_ONLY_WITH_IMMEDIATE);
				/* Immediate data comes after the BTH */
				ohdr->u.imm_data = wqe->wr.ex.imm_data;
				hwords += 1;
			}
			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
				bth0 |= IB_BTH_SOLICITED;
			qp->s_wqe = wqe;
			if (++qp->s_cur >= qp->s_size)
				qp->s_cur = 0;
			break;

		case IB_WR_RDMA_WRITE:
		case IB_WR_RDMA_WRITE_WITH_IMM:
			ohdr->u.rc.reth.vaddr =
				cpu_to_be64(wqe->rdma_wr.remote_addr);
			ohdr->u.rc.reth.rkey =
				cpu_to_be32(wqe->rdma_wr.rkey);
			ohdr->u.rc.reth.length = cpu_to_be32(len);
			hwords += sizeof(struct ib_reth) / 4;
			if (len > pmtu) {
				qp->s_state = OP(RDMA_WRITE_FIRST);
				len = pmtu;
				break;
			}
			if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
				qp->s_state = OP(RDMA_WRITE_ONLY);
			} else {
				qp->s_state =
					OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
				/* Immediate data comes after the RETH */
				ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
				hwords += 1;
				if (wqe->wr.send_flags & IB_SEND_SOLICITED)
					bth0 |= IB_BTH_SOLICITED;
			}
			qp->s_wqe = wqe;
			if (++qp->s_cur >= qp->s_size)
				qp->s_cur = 0;
			break;

		default:
			goto bail;
		}
		break;

	case OP(SEND_FIRST):
		qp->s_state = OP(SEND_MIDDLE);
		/* FALLTHROUGH */
	case OP(SEND_MIDDLE):
		len = qp->s_len;
		if (len > pmtu) {
			len = pmtu;
			middle = HFI1_CAP_IS_KSET(SDMA_AHG);
			break;
		}
		if (wqe->wr.opcode == IB_WR_SEND) {
			qp->s_state = OP(SEND_LAST);
		} else {
			qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
			/* Immediate data comes after the BTH */
			ohdr->u.imm_data = wqe->wr.ex.imm_data;
			hwords += 1;
		}
		if (wqe->wr.send_flags & IB_SEND_SOLICITED)
			bth0 |= IB_BTH_SOLICITED;
		qp->s_wqe = wqe;
		if (++qp->s_cur >= qp->s_size)
			qp->s_cur = 0;
		break;

	case OP(RDMA_WRITE_FIRST):
		qp->s_state = OP(RDMA_WRITE_MIDDLE);
		/* FALLTHROUGH */
	case OP(RDMA_WRITE_MIDDLE):
		len = qp->s_len;
		if (len > pmtu) {
			len = pmtu;
			middle = HFI1_CAP_IS_KSET(SDMA_AHG);
			break;
		}
		if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
			qp->s_state = OP(RDMA_WRITE_LAST);
		} else {
			qp->s_state =
				OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
			/* Immediate data comes after the BTH */
			ohdr->u.imm_data = wqe->wr.ex.imm_data;
			hwords += 1;
			if (wqe->wr.send_flags & IB_SEND_SOLICITED)
				bth0 |= IB_BTH_SOLICITED;
		}
		qp->s_wqe = wqe;
		if (++qp->s_cur >= qp->s_size)
			qp->s_cur = 0;
		break;
	}
	qp->s_len -= len;
	ps->s_txreq->hdr_dwords = hwords;
	ps->s_txreq->sde = priv->s_sde;
	ps->s_txreq->ss = &qp->s_sge;
	ps->s_txreq->s_cur_size = len;
	hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
			     mask_psn(qp->s_psn++), middle, ps);
	return 1;

done_free_tx:
	hfi1_put_txreq(ps->s_txreq);
	ps->s_txreq = NULL;
	return 1;

bail:
	hfi1_put_txreq(ps->s_txreq);

bail_no_tx:
	ps->s_txreq = NULL;
	qp->s_flags &= ~RVT_S_BUSY;
	return 0;
}

/**
 * hfi1_uc_rcv - handle an incoming UC packet
 * @ibp: the port the packet came in on
 * @hdr: the header of the packet
 * @rcv_flags: flags relevant to rcv processing
 * @data: the packet data
 * @tlen: the length of the packet
 * @qp: the QP for this packet.
 *
 * This is called from qp_rcv() to process an incoming UC packet
 * for the given QP.
 * Called at interrupt level.
 */
void hfi1_uc_rcv(struct hfi1_packet *packet)
{
	struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
	void *data = packet->payload;
	u32 tlen = packet->tlen;
	struct rvt_qp *qp = packet->qp;
	struct ib_other_headers *ohdr = packet->ohdr;
	u32 opcode = packet->opcode;
	u32 hdrsize = packet->hlen;
	u32 psn;
	u32 pad = packet->pad;
	struct ib_wc wc;
	u32 pmtu = qp->pmtu;
	struct ib_reth *reth;
	int ret;
	u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);

	if (hfi1_ruc_check_hdr(ibp, packet))
		return;

	process_ecn(qp, packet, true);

	psn = ib_bth_get_psn(ohdr);
	/* Compare the PSN verses the expected PSN. */
	if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
		/*
		 * Handle a sequence error.
		 * Silently drop any current message.
		 */
		qp->r_psn = psn;
inv:
		if (qp->r_state == OP(SEND_FIRST) ||
		    qp->r_state == OP(SEND_MIDDLE)) {
			set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
			qp->r_sge.num_sge = 0;
		} else {
			rvt_put_ss(&qp->r_sge);
		}
		qp->r_state = OP(SEND_LAST);
		switch (opcode) {
		case OP(SEND_FIRST):
		case OP(SEND_ONLY):
		case OP(SEND_ONLY_WITH_IMMEDIATE):
			goto send_first;

		case OP(RDMA_WRITE_FIRST):
		case OP(RDMA_WRITE_ONLY):
		case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
			goto rdma_first;

		default:
			goto drop;
		}
	}

	/* Check for opcode sequence errors. */
	switch (qp->r_state) {
	case OP(SEND_FIRST):
	case OP(SEND_MIDDLE):
		if (opcode == OP(SEND_MIDDLE) ||
		    opcode == OP(SEND_LAST) ||
		    opcode == OP(SEND_LAST_WITH_IMMEDIATE))
			break;
		goto inv;

	case OP(RDMA_WRITE_FIRST):
	case OP(RDMA_WRITE_MIDDLE):
		if (opcode == OP(RDMA_WRITE_MIDDLE) ||
		    opcode == OP(RDMA_WRITE_LAST) ||
		    opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
			break;
		goto inv;

	default:
		if (opcode == OP(SEND_FIRST) ||
		    opcode == OP(SEND_ONLY) ||
		    opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
		    opcode == OP(RDMA_WRITE_FIRST) ||
		    opcode == OP(RDMA_WRITE_ONLY) ||
		    opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
			break;
		goto inv;
	}

	if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
		rvt_comm_est(qp);

	/* OK, process the packet. */
	switch (opcode) {
	case OP(SEND_FIRST):
	case OP(SEND_ONLY):
	case OP(SEND_ONLY_WITH_IMMEDIATE):
send_first:
		if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
			qp->r_sge = qp->s_rdma_read_sge;
		} else {
			ret = rvt_get_rwqe(qp, false);
			if (ret < 0)
				goto op_err;
			if (!ret)
				goto drop;
			/*
			 * qp->s_rdma_read_sge will be the owner
			 * of the mr references.
			 */
			qp->s_rdma_read_sge = qp->r_sge;
		}
		qp->r_rcv_len = 0;
		if (opcode == OP(SEND_ONLY))
			goto no_immediate_data;
		else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
			goto send_last_imm;
		/* FALLTHROUGH */
	case OP(SEND_MIDDLE):
		/* Check for invalid length PMTU or posted rwqe len. */
		/*
		 * There will be no padding for 9B packet but 16B packets
		 * will come in with some padding since we always add
		 * CRC and LT bytes which will need to be flit aligned
		 */
		if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
			goto rewind;
		qp->r_rcv_len += pmtu;
		if (unlikely(qp->r_rcv_len > qp->r_len))
			goto rewind;
		hfi1_copy_sge(&qp->r_sge, data, pmtu, false, false);
		break;

	case OP(SEND_LAST_WITH_IMMEDIATE):
send_last_imm:
		wc.ex.imm_data = ohdr->u.imm_data;
		wc.wc_flags = IB_WC_WITH_IMM;
		goto send_last;
	case OP(SEND_LAST):
no_immediate_data:
		wc.ex.imm_data = 0;
		wc.wc_flags = 0;
send_last:
		/* Check for invalid length. */
		/* LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + extra_bytes)))
			goto rewind;
		/* Don't count the CRC. */
		tlen -= (hdrsize + extra_bytes);
		wc.byte_len = tlen + qp->r_rcv_len;
		if (unlikely(wc.byte_len > qp->r_len))
			goto rewind;
		wc.opcode = IB_WC_RECV;
		hfi1_copy_sge(&qp->r_sge, data, tlen, false, false);
		rvt_put_ss(&qp->s_rdma_read_sge);
last_imm:
		wc.wr_id = qp->r_wr_id;
		wc.status = IB_WC_SUCCESS;
		wc.qp = &qp->ibqp;
		wc.src_qp = qp->remote_qpn;
		wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX;
		/*
		 * It seems that IB mandates the presence of an SL in a
		 * work completion only for the UD transport (see section
		 * 11.4.2 of IBTA Vol. 1).
		 *
		 * However, the way the SL is chosen below is consistent
		 * with the way that IB/qib works and is trying avoid
		 * introducing incompatibilities.
		 *
		 * See also OPA Vol. 1, section 9.7.6, and table 9-17.
		 */
		wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
		/* zero fields that are N/A */
		wc.vendor_err = 0;
		wc.pkey_index = 0;
		wc.dlid_path_bits = 0;
		wc.port_num = 0;
		/* Signal completion event if the solicited bit is set. */
		rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
			     ib_bth_is_solicited(ohdr));
		break;

	case OP(RDMA_WRITE_FIRST):
	case OP(RDMA_WRITE_ONLY):
	case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
rdma_first:
		if (unlikely(!(qp->qp_access_flags &
			       IB_ACCESS_REMOTE_WRITE))) {
			goto drop;
		}
		reth = &ohdr->u.rc.reth;
		qp->r_len = be32_to_cpu(reth->length);
		qp->r_rcv_len = 0;
		qp->r_sge.sg_list = NULL;
		if (qp->r_len != 0) {
			u32 rkey = be32_to_cpu(reth->rkey);
			u64 vaddr = be64_to_cpu(reth->vaddr);
			int ok;

			/* Check rkey */
			ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
					 vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
			if (unlikely(!ok))
				goto drop;
			qp->r_sge.num_sge = 1;
		} else {
			qp->r_sge.num_sge = 0;
			qp->r_sge.sge.mr = NULL;
			qp->r_sge.sge.vaddr = NULL;
			qp->r_sge.sge.length = 0;
			qp->r_sge.sge.sge_length = 0;
		}
		if (opcode == OP(RDMA_WRITE_ONLY)) {
			goto rdma_last;
		} else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
			wc.ex.imm_data = ohdr->u.rc.imm_data;
			goto rdma_last_imm;
		}
		/* FALLTHROUGH */
	case OP(RDMA_WRITE_MIDDLE):
		/* Check for invalid length PMTU or posted rwqe len. */
		if (unlikely(tlen != (hdrsize + pmtu + 4)))
			goto drop;
		qp->r_rcv_len += pmtu;
		if (unlikely(qp->r_rcv_len > qp->r_len))
			goto drop;
		hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false);
		break;

	case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
		wc.ex.imm_data = ohdr->u.imm_data;
rdma_last_imm:
		wc.wc_flags = IB_WC_WITH_IMM;

		/* Check for invalid length. */
		/* LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4)))
			goto drop;
		/* Don't count the CRC. */
		tlen -= (hdrsize + extra_bytes);
		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
			goto drop;
		if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
			rvt_put_ss(&qp->s_rdma_read_sge);
		} else {
			ret = rvt_get_rwqe(qp, true);
			if (ret < 0)
				goto op_err;
			if (!ret)
				goto drop;
		}
		wc.byte_len = qp->r_len;
		wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
		hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
		rvt_put_ss(&qp->r_sge);
		goto last_imm;

	case OP(RDMA_WRITE_LAST):
rdma_last:
		/* Check for invalid length. */
		/* LAST len should be >= 1 */
		if (unlikely(tlen < (hdrsize + pad + 4)))
			goto drop;
		/* Don't count the CRC. */
		tlen -= (hdrsize + extra_bytes);
		if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
			goto drop;
		hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
		rvt_put_ss(&qp->r_sge);
		break;

	default:
		/* Drop packet for unknown opcodes. */
		goto drop;
	}
	qp->r_psn++;
	qp->r_state = opcode;
	return;

rewind:
	set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
	qp->r_sge.num_sge = 0;
drop:
	ibp->rvp.n_pkt_drops++;
	return;

op_err:
	rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
}