aboutsummaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/ehca/ehca_reqs.c
blob: fd05f48f6b0b649305014e22967e41bf4dcafefb (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
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
/*
 *  IBM eServer eHCA Infiniband device driver for Linux on POWER
 *
 *  post_send/recv, poll_cq, req_notify
 *
 *  Authors: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
 *           Waleri Fomin <fomin@de.ibm.com>
 *           Joachim Fenkes <fenkes@de.ibm.com>
 *           Reinhard Ernst <rernst@de.ibm.com>
 *
 *  Copyright (c) 2005 IBM Corporation
 *
 *  All rights reserved.
 *
 *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
 *  BSD.
 *
 * OpenIB 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.
 *
 * 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 "ehca_classes.h"
#include "ehca_tools.h"
#include "ehca_qes.h"
#include "ehca_iverbs.h"
#include "hcp_if.h"
#include "hipz_fns.h"

/* in RC traffic, insert an empty RDMA READ every this many packets */
#define ACK_CIRC_THRESHOLD 2000000

static u64 replace_wr_id(u64 wr_id, u16 idx)
{
	u64 ret;

	ret = wr_id & ~QMAP_IDX_MASK;
	ret |= idx & QMAP_IDX_MASK;

	return ret;
}

static u16 get_app_wr_id(u64 wr_id)
{
	return wr_id & QMAP_IDX_MASK;
}

static inline int ehca_write_rwqe(struct ipz_queue *ipz_rqueue,
				  struct ehca_wqe *wqe_p,
				  struct ib_recv_wr *recv_wr,
				  u32 rq_map_idx)
{
	u8 cnt_ds;
	if (unlikely((recv_wr->num_sge < 0) ||
		     (recv_wr->num_sge > ipz_rqueue->act_nr_of_sg))) {
		ehca_gen_err("Invalid number of WQE SGE. "
			 "num_sqe=%x max_nr_of_sg=%x",
			 recv_wr->num_sge, ipz_rqueue->act_nr_of_sg);
		return -EINVAL; /* invalid SG list length */
	}

	/* clear wqe header until sglist */
	memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));

	wqe_p->work_request_id = replace_wr_id(recv_wr->wr_id, rq_map_idx);
	wqe_p->nr_of_data_seg = recv_wr->num_sge;

	for (cnt_ds = 0; cnt_ds < recv_wr->num_sge; cnt_ds++) {
		wqe_p->u.all_rcv.sg_list[cnt_ds].vaddr =
			recv_wr->sg_list[cnt_ds].addr;
		wqe_p->u.all_rcv.sg_list[cnt_ds].lkey =
			recv_wr->sg_list[cnt_ds].lkey;
		wqe_p->u.all_rcv.sg_list[cnt_ds].length =
			recv_wr->sg_list[cnt_ds].length;
	}

	if (ehca_debug_level >= 3) {
		ehca_gen_dbg("RECEIVE WQE written into ipz_rqueue=%p",
			     ipz_rqueue);
		ehca_dmp(wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "recv wqe");
	}

	return 0;
}

#if defined(DEBUG_GSI_SEND_WR)

/* need ib_mad struct */
#include <rdma/ib_mad.h>

static void trace_send_wr_ud(const struct ib_send_wr *send_wr)
{
	int idx;
	int j;
	while (send_wr) {
		struct ib_mad_hdr *mad_hdr = send_wr->wr.ud.mad_hdr;
		struct ib_sge *sge = send_wr->sg_list;
		ehca_gen_dbg("send_wr#%x wr_id=%lx num_sge=%x "
			     "send_flags=%x opcode=%x", idx, send_wr->wr_id,
			     send_wr->num_sge, send_wr->send_flags,
			     send_wr->opcode);
		if (mad_hdr) {
			ehca_gen_dbg("send_wr#%x mad_hdr base_version=%x "
				     "mgmt_class=%x class_version=%x method=%x "
				     "status=%x class_specific=%x tid=%lx "
				     "attr_id=%x resv=%x attr_mod=%x",
				     idx, mad_hdr->base_version,
				     mad_hdr->mgmt_class,
				     mad_hdr->class_version, mad_hdr->method,
				     mad_hdr->status, mad_hdr->class_specific,
				     mad_hdr->tid, mad_hdr->attr_id,
				     mad_hdr->resv,
				     mad_hdr->attr_mod);
		}
		for (j = 0; j < send_wr->num_sge; j++) {
			u8 *data = (u8 *)abs_to_virt(sge->addr);
			ehca_gen_dbg("send_wr#%x sge#%x addr=%p length=%x "
				     "lkey=%x",
				     idx, j, data, sge->length, sge->lkey);
			/* assume length is n*16 */
			ehca_dmp(data, sge->length, "send_wr#%x sge#%x",
				 idx, j);
			sge++;
		} /* eof for j */
		idx++;
		send_wr = send_wr->next;
	} /* eof while send_wr */
}

#endif /* DEBUG_GSI_SEND_WR */

static inline int ehca_write_swqe(struct ehca_qp *qp,
				  struct ehca_wqe *wqe_p,
				  const struct ib_send_wr *send_wr,
				  u32 sq_map_idx,
				  int hidden)
{
	u32 idx;
	u64 dma_length;
	struct ehca_av *my_av;
	u32 remote_qkey = send_wr->wr.ud.remote_qkey;
	struct ehca_qmap_entry *qmap_entry = &qp->sq_map.map[sq_map_idx];

	if (unlikely((send_wr->num_sge < 0) ||
		     (send_wr->num_sge > qp->ipz_squeue.act_nr_of_sg))) {
		ehca_gen_err("Invalid number of WQE SGE. "
			 "num_sqe=%x max_nr_of_sg=%x",
			 send_wr->num_sge, qp->ipz_squeue.act_nr_of_sg);
		return -EINVAL; /* invalid SG list length */
	}

	/* clear wqe header until sglist */
	memset(wqe_p, 0, offsetof(struct ehca_wqe, u.ud_av.sg_list));

	wqe_p->work_request_id = replace_wr_id(send_wr->wr_id, sq_map_idx);

	qmap_entry->app_wr_id = get_app_wr_id(send_wr->wr_id);
	qmap_entry->reported = 0;
	qmap_entry->cqe_req = 0;

	switch (send_wr->opcode) {
	case IB_WR_SEND:
	case IB_WR_SEND_WITH_IMM:
		wqe_p->optype = WQE_OPTYPE_SEND;
		break;
	case IB_WR_RDMA_WRITE:
	case IB_WR_RDMA_WRITE_WITH_IMM:
		wqe_p->optype = WQE_OPTYPE_RDMAWRITE;
		break;
	case IB_WR_RDMA_READ:
		wqe_p->optype = WQE_OPTYPE_RDMAREAD;
		break;
	default:
		ehca_gen_err("Invalid opcode=%x", send_wr->opcode);
		return -EINVAL; /* invalid opcode */
	}

	wqe_p->wqef = (send_wr->opcode) & WQEF_HIGH_NIBBLE;

	wqe_p->wr_flag = 0;

	if ((send_wr->send_flags & IB_SEND_SIGNALED ||
	    qp->init_attr.sq_sig_type == IB_SIGNAL_ALL_WR)
	    && !hidden) {
		wqe_p->wr_flag |= WQE_WRFLAG_REQ_SIGNAL_COM;
		qmap_entry->cqe_req = 1;
	}

	if (send_wr->opcode == IB_WR_SEND_WITH_IMM ||
	    send_wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM) {
		/* this might not work as long as HW does not support it */
		wqe_p->immediate_data = be32_to_cpu(send_wr->ex.imm_data);
		wqe_p->wr_flag |= WQE_WRFLAG_IMM_DATA_PRESENT;
	}

	wqe_p->nr_of_data_seg = send_wr->num_sge;

	switch (qp->qp_type) {
	case IB_QPT_SMI:
	case IB_QPT_GSI:
		/* no break is intential here */
	case IB_QPT_UD:
		/* IB 1.2 spec C10-15 compliance */
		if (send_wr->wr.ud.remote_qkey & 0x80000000)
			remote_qkey = qp->qkey;

		wqe_p->destination_qp_number = send_wr->wr.ud.remote_qpn << 8;
		wqe_p->local_ee_context_qkey = remote_qkey;
		if (unlikely(!send_wr->wr.ud.ah)) {
			ehca_gen_err("wr.ud.ah is NULL. qp=%p", qp);
			return -EINVAL;
		}
		if (unlikely(send_wr->wr.ud.remote_qpn == 0)) {
			ehca_gen_err("dest QP# is 0. qp=%x", qp->real_qp_num);
			return -EINVAL;
		}
		my_av = container_of(send_wr->wr.ud.ah, struct ehca_av, ib_ah);
		wqe_p->u.ud_av.ud_av = my_av->av;

		/*
		 * omitted check of IB_SEND_INLINE
		 * since HW does not support it
		 */
		for (idx = 0; idx < send_wr->num_sge; idx++) {
			wqe_p->u.ud_av.sg_list[idx].vaddr =
				send_wr->sg_list[idx].addr;
			wqe_p->u.ud_av.sg_list[idx].lkey =
				send_wr->sg_list[idx].lkey;
			wqe_p->u.ud_av.sg_list[idx].length =
				send_wr->sg_list[idx].length;
		} /* eof for idx */
		if (qp->qp_type == IB_QPT_SMI ||
		    qp->qp_type == IB_QPT_GSI)
			wqe_p->u.ud_av.ud_av.pmtu = 1;
		if (qp->qp_type == IB_QPT_GSI) {
			wqe_p->pkeyi = send_wr->wr.ud.pkey_index;
#ifdef DEBUG_GSI_SEND_WR
			trace_send_wr_ud(send_wr);
#endif /* DEBUG_GSI_SEND_WR */
		}
		break;

	case IB_QPT_UC:
		if (send_wr->send_flags & IB_SEND_FENCE)
			wqe_p->wr_flag |= WQE_WRFLAG_FENCE;
		/* no break is intentional here */
	case IB_QPT_RC:
		/* TODO: atomic not implemented */
		wqe_p->u.nud.remote_virtual_address =
			send_wr->wr.rdma.remote_addr;
		wqe_p->u.nud.rkey = send_wr->wr.rdma.rkey;

		/*
		 * omitted checking of IB_SEND_INLINE
		 * since HW does not support it
		 */
		dma_length = 0;
		for (idx = 0; idx < send_wr->num_sge; idx++) {
			wqe_p->u.nud.sg_list[idx].vaddr =
				send_wr->sg_list[idx].addr;
			wqe_p->u.nud.sg_list[idx].lkey =
				send_wr->sg_list[idx].lkey;
			wqe_p->u.nud.sg_list[idx].length =
				send_wr->sg_list[idx].length;
			dma_length += send_wr->sg_list[idx].length;
		} /* eof idx */
		wqe_p->u.nud.atomic_1st_op_dma_len = dma_length;

		/* unsolicited ack circumvention */
		if (send_wr->opcode == IB_WR_RDMA_READ) {
			/* on RDMA read, switch on and reset counters */
			qp->message_count = qp->packet_count = 0;
			qp->unsol_ack_circ = 1;
		} else
			/* else estimate #packets */
			qp->packet_count += (dma_length >> qp->mtu_shift) + 1;

		break;

	default:
		ehca_gen_err("Invalid qptype=%x", qp->qp_type);
		return -EINVAL;
	}

	if (ehca_debug_level >= 3) {
		ehca_gen_dbg("SEND WQE written into queue qp=%p ", qp);
		ehca_dmp( wqe_p, 16*(6 + wqe_p->nr_of_data_seg), "send wqe");
	}
	return 0;
}

/* map_ib_wc_status converts raw cqe_status to ib_wc_status */
static inline void map_ib_wc_status(u32 cqe_status,
				    enum ib_wc_status *wc_status)
{
	if (unlikely(cqe_status & WC_STATUS_ERROR_BIT)) {
		switch (cqe_status & 0x3F) {
		case 0x01:
		case 0x21:
			*wc_status = IB_WC_LOC_LEN_ERR;
			break;
		case 0x02:
		case 0x22:
			*wc_status = IB_WC_LOC_QP_OP_ERR;
			break;
		case 0x03:
		case 0x23:
			*wc_status = IB_WC_LOC_EEC_OP_ERR;
			break;
		case 0x04:
		case 0x24:
			*wc_status = IB_WC_LOC_PROT_ERR;
			break;
		case 0x05:
		case 0x25:
			*wc_status = IB_WC_WR_FLUSH_ERR;
			break;
		case 0x06:
			*wc_status = IB_WC_MW_BIND_ERR;
			break;
		case 0x07: /* remote error - look into bits 20:24 */
			switch ((cqe_status
				 & WC_STATUS_REMOTE_ERROR_FLAGS) >> 11) {
			case 0x0:
				/*
				 * PSN Sequence Error!
				 * couldn't find a matching status!
				 */
				*wc_status = IB_WC_GENERAL_ERR;
				break;
			case 0x1:
				*wc_status = IB_WC_REM_INV_REQ_ERR;
				break;
			case 0x2:
				*wc_status = IB_WC_REM_ACCESS_ERR;
				break;
			case 0x3:
				*wc_status = IB_WC_REM_OP_ERR;
				break;
			case 0x4:
				*wc_status = IB_WC_REM_INV_RD_REQ_ERR;
				break;
			}
			break;
		case 0x08:
			*wc_status = IB_WC_RETRY_EXC_ERR;
			break;
		case 0x09:
			*wc_status = IB_WC_RNR_RETRY_EXC_ERR;
			break;
		case 0x0A:
		case 0x2D:
			*wc_status = IB_WC_REM_ABORT_ERR;
			break;
		case 0x0B:
		case 0x2E:
			*wc_status = IB_WC_INV_EECN_ERR;
			break;
		case 0x0C:
		case 0x2F:
			*wc_status = IB_WC_INV_EEC_STATE_ERR;
			break;
		case 0x0D:
			*wc_status = IB_WC_BAD_RESP_ERR;
			break;
		case 0x10:
			/* WQE purged */
			*wc_status = IB_WC_WR_FLUSH_ERR;
			break;
		default:
			*wc_status = IB_WC_FATAL_ERR;

		}
	} else
		*wc_status = IB_WC_SUCCESS;
}

static inline int post_one_send(struct ehca_qp *my_qp,
			 struct ib_send_wr *cur_send_wr,
			 int hidden)
{
	struct ehca_wqe *wqe_p;
	int ret;
	u32 sq_map_idx;
	u64 start_offset = my_qp->ipz_squeue.current_q_offset;

	/* get pointer next to free WQE */
	wqe_p = ipz_qeit_get_inc(&my_qp->ipz_squeue);
	if (unlikely(!wqe_p)) {
		/* too many posted work requests: queue overflow */
		ehca_err(my_qp->ib_qp.device, "Too many posted WQEs "
			 "qp_num=%x", my_qp->ib_qp.qp_num);
		return -ENOMEM;
	}

	/*
	 * Get the index of the WQE in the send queue. The same index is used
	 * for writing into the sq_map.
	 */
	sq_map_idx = start_offset / my_qp->ipz_squeue.qe_size;

	/* write a SEND WQE into the QUEUE */
	ret = ehca_write_swqe(my_qp, wqe_p, cur_send_wr, sq_map_idx, hidden);
	/*
	 * if something failed,
	 * reset the free entry pointer to the start value
	 */
	if (unlikely(ret)) {
		my_qp->ipz_squeue.current_q_offset = start_offset;
		ehca_err(my_qp->ib_qp.device, "Could not write WQE "
			 "qp_num=%x", my_qp->ib_qp.qp_num);
		return -EINVAL;
	}

	return 0;
}

int ehca_post_send(struct ib_qp *qp,
		   struct ib_send_wr *send_wr,
		   struct ib_send_wr **bad_send_wr)
{
	struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);
	int wqe_cnt = 0;
	int ret = 0;
	unsigned long flags;

	/* Reject WR if QP is in RESET, INIT or RTR state */
	if (unlikely(my_qp->state < IB_QPS_RTS)) {
		ehca_err(qp->device, "Invalid QP state  qp_state=%d qpn=%x",
			 my_qp->state, qp->qp_num);
		ret = -EINVAL;
		goto out;
	}

	/* LOCK the QUEUE */
	spin_lock_irqsave(&my_qp->spinlock_s, flags);

	/* Send an empty extra RDMA read if:
	 *  1) there has been an RDMA read on this connection before
	 *  2) no RDMA read occurred for ACK_CIRC_THRESHOLD link packets
	 *  3) we can be sure that any previous extra RDMA read has been
	 *     processed so we don't overflow the SQ
	 */
	if (unlikely(my_qp->unsol_ack_circ &&
		     my_qp->packet_count > ACK_CIRC_THRESHOLD &&
		     my_qp->message_count > my_qp->init_attr.cap.max_send_wr)) {
		/* insert an empty RDMA READ to fix up the remote QP state */
		struct ib_send_wr circ_wr;
		memset(&circ_wr, 0, sizeof(circ_wr));
		circ_wr.opcode = IB_WR_RDMA_READ;
		post_one_send(my_qp, &circ_wr, 1); /* ignore retcode */
		wqe_cnt++;
		ehca_dbg(qp->device, "posted circ wr  qp_num=%x", qp->qp_num);
		my_qp->message_count = my_qp->packet_count = 0;
	}

	/* loop processes list of send reqs */
	while (send_wr) {
		ret = post_one_send(my_qp, send_wr, 0);
		if (unlikely(ret)) {
			goto post_send_exit0;
		}
		wqe_cnt++;
		send_wr = send_wr->next;
	}

post_send_exit0:
	iosync(); /* serialize GAL register access */
	hipz_update_sqa(my_qp, wqe_cnt);
	if (unlikely(ret || ehca_debug_level >= 2))
		ehca_dbg(qp->device, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
			 my_qp, qp->qp_num, wqe_cnt, ret);
	my_qp->message_count += wqe_cnt;
	spin_unlock_irqrestore(&my_qp->spinlock_s, flags);

out:
	if (ret)
		*bad_send_wr = send_wr;
	return ret;
}

static int internal_post_recv(struct ehca_qp *my_qp,
			      struct ib_device *dev,
			      struct ib_recv_wr *recv_wr,
			      struct ib_recv_wr **bad_recv_wr)
{
	struct ehca_wqe *wqe_p;
	int wqe_cnt = 0;
	int ret = 0;
	u32 rq_map_idx;
	unsigned long flags;
	struct ehca_qmap_entry *qmap_entry;

	if (unlikely(!HAS_RQ(my_qp))) {
		ehca_err(dev, "QP has no RQ  ehca_qp=%p qp_num=%x ext_type=%d",
			 my_qp, my_qp->real_qp_num, my_qp->ext_type);
		ret = -ENODEV;
		goto out;
	}

	/* LOCK the QUEUE */
	spin_lock_irqsave(&my_qp->spinlock_r, flags);

	/* loop processes list of recv reqs */
	while (recv_wr) {
		u64 start_offset = my_qp->ipz_rqueue.current_q_offset;
		/* get pointer next to free WQE */
		wqe_p = ipz_qeit_get_inc(&my_qp->ipz_rqueue);
		if (unlikely(!wqe_p)) {
			/* too many posted work requests: queue overflow */
			ret = -ENOMEM;
			ehca_err(dev, "Too many posted WQEs "
				"qp_num=%x", my_qp->real_qp_num);
			goto post_recv_exit0;
		}
		/*
		 * Get the index of the WQE in the recv queue. The same index
		 * is used for writing into the rq_map.
		 */
		rq_map_idx = start_offset / my_qp->ipz_rqueue.qe_size;

		/* write a RECV WQE into the QUEUE */
		ret = ehca_write_rwqe(&my_qp->ipz_rqueue, wqe_p, recv_wr,
				rq_map_idx);
		/*
		 * if something failed,
		 * reset the free entry pointer to the start value
		 */
		if (unlikely(ret)) {
			my_qp->ipz_rqueue.current_q_offset = start_offset;
			ret = -EINVAL;
			ehca_err(dev, "Could not write WQE "
				"qp_num=%x", my_qp->real_qp_num);
			goto post_recv_exit0;
		}

		qmap_entry = &my_qp->rq_map.map[rq_map_idx];
		qmap_entry->app_wr_id = get_app_wr_id(recv_wr->wr_id);
		qmap_entry->reported = 0;
		qmap_entry->cqe_req = 1;

		wqe_cnt++;
		recv_wr = recv_wr->next;
	} /* eof for recv_wr */

post_recv_exit0:
	iosync(); /* serialize GAL register access */
	hipz_update_rqa(my_qp, wqe_cnt);
	if (unlikely(ret || ehca_debug_level >= 2))
	    ehca_dbg(dev, "ehca_qp=%p qp_num=%x wqe_cnt=%d ret=%i",
		     my_qp, my_qp->real_qp_num, wqe_cnt, ret);
	spin_unlock_irqrestore(&my_qp->spinlock_r, flags);

out:
	if (ret)
		*bad_recv_wr = recv_wr;

	return ret;
}

int ehca_post_recv(struct ib_qp *qp,
		   struct ib_recv_wr *recv_wr,
		   struct ib_recv_wr **bad_recv_wr)
{
	struct ehca_qp *my_qp = container_of(qp, struct ehca_qp, ib_qp);

	/* Reject WR if QP is in RESET state */
	if (unlikely(my_qp->state == IB_QPS_RESET)) {
		ehca_err(qp->device, "Invalid QP state  qp_state=%d qpn=%x",
			 my_qp->state, qp->qp_num);
		*bad_recv_wr = recv_wr;
		return -EINVAL;
	}

	return internal_post_recv(my_qp, qp->device, recv_wr, bad_recv_wr);
}

int ehca_post_srq_recv(struct ib_srq *srq,
		       struct ib_recv_wr *recv_wr,
		       struct ib_recv_wr **bad_recv_wr)
{
	return internal_post_recv(container_of(srq, struct ehca_qp, ib_srq),
				  srq->device, recv_wr, bad_recv_wr);
}

/*
 * ib_wc_opcode table converts ehca wc opcode to ib
 * Since we use zero to indicate invalid opcode, the actual ib opcode must
 * be decremented!!!
 */
static const u8 ib_wc_opcode[255] = {
	[0x01] = IB_WC_RECV+1,
	[0x02] = IB_WC_RECV_RDMA_WITH_IMM+1,
	[0x04] = IB_WC_BIND_MW+1,
	[0x08] = IB_WC_FETCH_ADD+1,
	[0x10] = IB_WC_COMP_SWAP+1,
	[0x20] = IB_WC_RDMA_WRITE+1,
	[0x40] = IB_WC_RDMA_READ+1,
	[0x80] = IB_WC_SEND+1
};

/* internal function to poll one entry of cq */
static inline int ehca_poll_cq_one(struct ib_cq *cq, struct ib_wc *wc)
{
	int ret = 0, qmap_tail_idx;
	struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
	struct ehca_cqe *cqe;
	struct ehca_qp *my_qp;
	struct ehca_qmap_entry *qmap_entry;
	struct ehca_queue_map *qmap;
	int cqe_count = 0, is_error;

repoll:
	cqe = (struct ehca_cqe *)
		ipz_qeit_get_inc_valid(&my_cq->ipz_queue);
	if (!cqe) {
		ret = -EAGAIN;
		if (ehca_debug_level >= 3)
			ehca_dbg(cq->device, "Completion queue is empty  "
				 "my_cq=%p cq_num=%x", my_cq, my_cq->cq_number);
		goto poll_cq_one_exit0;
	}

	/* prevents loads being reordered across this point */
	rmb();

	cqe_count++;
	if (unlikely(cqe->status & WC_STATUS_PURGE_BIT)) {
		struct ehca_qp *qp;
		int purgeflag;
		unsigned long flags;

		qp = ehca_cq_get_qp(my_cq, cqe->local_qp_number);
		if (!qp) {
			ehca_err(cq->device, "cq_num=%x qp_num=%x "
				 "could not find qp -> ignore cqe",
				 my_cq->cq_number, cqe->local_qp_number);
			ehca_dmp(cqe, 64, "cq_num=%x qp_num=%x",
				 my_cq->cq_number, cqe->local_qp_number);
			/* ignore this purged cqe */
			goto repoll;
		}
		spin_lock_irqsave(&qp->spinlock_s, flags);
		purgeflag = qp->sqerr_purgeflag;
		spin_unlock_irqrestore(&qp->spinlock_s, flags);

		if (purgeflag) {
			ehca_dbg(cq->device,
				 "Got CQE with purged bit qp_num=%x src_qp=%x",
				 cqe->local_qp_number, cqe->remote_qp_number);
			if (ehca_debug_level >= 2)
				ehca_dmp(cqe, 64, "qp_num=%x src_qp=%x",
					 cqe->local_qp_number,
					 cqe->remote_qp_number);
			/*
			 * ignore this to avoid double cqes of bad wqe
			 * that caused sqe and turn off purge flag
			 */
			qp->sqerr_purgeflag = 0;
			goto repoll;
		}
	}

	is_error = cqe->status & WC_STATUS_ERROR_BIT;

	/* trace error CQEs if debug_level >= 1, trace all CQEs if >= 3 */
	if (unlikely(ehca_debug_level >= 3 || (ehca_debug_level && is_error))) {
		ehca_dbg(cq->device,
			 "Received %sCOMPLETION ehca_cq=%p cq_num=%x -----",
			 is_error ? "ERROR " : "", my_cq, my_cq->cq_number);
		ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
			 my_cq, my_cq->cq_number);
		ehca_dbg(cq->device,
			 "ehca_cq=%p cq_num=%x -------------------------",
			 my_cq, my_cq->cq_number);
	}

	read_lock(&ehca_qp_idr_lock);
	my_qp = idr_find(&ehca_qp_idr, cqe->qp_token);
	read_unlock(&ehca_qp_idr_lock);
	if (!my_qp)
		goto repoll;
	wc->qp = &my_qp->ib_qp;

	qmap_tail_idx = get_app_wr_id(cqe->work_request_id);
	if (!(cqe->w_completion_flags & WC_SEND_RECEIVE_BIT))
		/* We got a send completion. */
		qmap = &my_qp->sq_map;
	else
		/* We got a receive completion. */
		qmap = &my_qp->rq_map;

	/* advance the tail pointer */
	qmap->tail = qmap_tail_idx;

	if (is_error) {
		/*
		 * set left_to_poll to 0 because in error state, we will not
		 * get any additional CQEs
		 */
		my_qp->sq_map.next_wqe_idx = next_index(my_qp->sq_map.tail,
							my_qp->sq_map.entries);
		my_qp->sq_map.left_to_poll = 0;
		ehca_add_to_err_list(my_qp, 1);

		my_qp->rq_map.next_wqe_idx = next_index(my_qp->rq_map.tail,
							my_qp->rq_map.entries);
		my_qp->rq_map.left_to_poll = 0;
		if (HAS_RQ(my_qp))
			ehca_add_to_err_list(my_qp, 0);
	}

	qmap_entry = &qmap->map[qmap_tail_idx];
	if (qmap_entry->reported) {
		ehca_warn(cq->device, "Double cqe on qp_num=%#x",
				my_qp->real_qp_num);
		/* found a double cqe, discard it and read next one */
		goto repoll;
	}

	wc->wr_id = replace_wr_id(cqe->work_request_id, qmap_entry->app_wr_id);
	qmap_entry->reported = 1;

	/* if left_to_poll is decremented to 0, add the QP to the error list */
	if (qmap->left_to_poll > 0) {
		qmap->left_to_poll--;
		if ((my_qp->sq_map.left_to_poll == 0) &&
				(my_qp->rq_map.left_to_poll == 0)) {
			ehca_add_to_err_list(my_qp, 1);
			if (HAS_RQ(my_qp))
				ehca_add_to_err_list(my_qp, 0);
		}
	}

	/* eval ib_wc_opcode */
	wc->opcode = ib_wc_opcode[cqe->optype]-1;
	if (unlikely(wc->opcode == -1)) {
		ehca_err(cq->device, "Invalid cqe->OPType=%x cqe->status=%x "
			 "ehca_cq=%p cq_num=%x",
			 cqe->optype, cqe->status, my_cq, my_cq->cq_number);
		/* dump cqe for other infos */
		ehca_dmp(cqe, 64, "ehca_cq=%p cq_num=%x",
			 my_cq, my_cq->cq_number);
		/* update also queue adder to throw away this entry!!! */
		goto repoll;
	}

	/* eval ib_wc_status */
	if (unlikely(is_error)) {
		/* complete with errors */
		map_ib_wc_status(cqe->status, &wc->status);
		wc->vendor_err = wc->status;
	} else
		wc->status = IB_WC_SUCCESS;

	wc->byte_len = cqe->nr_bytes_transferred;
	wc->pkey_index = cqe->pkey_index;
	wc->slid = cqe->rlid;
	wc->dlid_path_bits = cqe->dlid;
	wc->src_qp = cqe->remote_qp_number;
	/*
	 * HW has "Immed data present" and "GRH present" in bits 6 and 5.
	 * SW defines those in bits 1 and 0, so we can just shift and mask.
	 */
	wc->wc_flags = (cqe->w_completion_flags >> 5) & 3;
	wc->ex.imm_data = cpu_to_be32(cqe->immediate_data);
	wc->sl = cqe->service_level;

poll_cq_one_exit0:
	if (cqe_count > 0)
		hipz_update_feca(my_cq, cqe_count);

	return ret;
}

static int generate_flush_cqes(struct ehca_qp *my_qp, struct ib_cq *cq,
			       struct ib_wc *wc, int num_entries,
			       struct ipz_queue *ipz_queue, int on_sq)
{
	int nr = 0;
	struct ehca_wqe *wqe;
	u64 offset;
	struct ehca_queue_map *qmap;
	struct ehca_qmap_entry *qmap_entry;

	if (on_sq)
		qmap = &my_qp->sq_map;
	else
		qmap = &my_qp->rq_map;

	qmap_entry = &qmap->map[qmap->next_wqe_idx];

	while ((nr < num_entries) && (qmap_entry->reported == 0)) {
		/* generate flush CQE */

		memset(wc, 0, sizeof(*wc));

		offset = qmap->next_wqe_idx * ipz_queue->qe_size;
		wqe = (struct ehca_wqe *)ipz_qeit_calc(ipz_queue, offset);
		if (!wqe) {
			ehca_err(cq->device, "Invalid wqe offset=%#llx on "
				 "qp_num=%#x", offset, my_qp->real_qp_num);
			return nr;
		}

		wc->wr_id = replace_wr_id(wqe->work_request_id,
					  qmap_entry->app_wr_id);

		if (on_sq) {
			switch (wqe->optype) {
			case WQE_OPTYPE_SEND:
				wc->opcode = IB_WC_SEND;
				break;
			case WQE_OPTYPE_RDMAWRITE:
				wc->opcode = IB_WC_RDMA_WRITE;
				break;
			case WQE_OPTYPE_RDMAREAD:
				wc->opcode = IB_WC_RDMA_READ;
				break;
			default:
				ehca_err(cq->device, "Invalid optype=%x",
						wqe->optype);
				return nr;
			}
		} else
			wc->opcode = IB_WC_RECV;

		if (wqe->wr_flag & WQE_WRFLAG_IMM_DATA_PRESENT) {
			wc->ex.imm_data = wqe->immediate_data;
			wc->wc_flags |= IB_WC_WITH_IMM;
		}

		wc->status = IB_WC_WR_FLUSH_ERR;

		wc->qp = &my_qp->ib_qp;

		/* mark as reported and advance next_wqe pointer */
		qmap_entry->reported = 1;
		qmap->next_wqe_idx = next_index(qmap->next_wqe_idx,
						qmap->entries);
		qmap_entry = &qmap->map[qmap->next_wqe_idx];

		wc++; nr++;
	}

	return nr;

}

int ehca_poll_cq(struct ib_cq *cq, int num_entries, struct ib_wc *wc)
{
	struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
	int nr;
	struct ehca_qp *err_qp;
	struct ib_wc *current_wc = wc;
	int ret = 0;
	unsigned long flags;
	int entries_left = num_entries;

	if (num_entries < 1) {
		ehca_err(cq->device, "Invalid num_entries=%d ehca_cq=%p "
			 "cq_num=%x", num_entries, my_cq, my_cq->cq_number);
		ret = -EINVAL;
		goto poll_cq_exit0;
	}

	spin_lock_irqsave(&my_cq->spinlock, flags);

	/* generate flush cqes for send queues */
	list_for_each_entry(err_qp, &my_cq->sqp_err_list, sq_err_node) {
		nr = generate_flush_cqes(err_qp, cq, current_wc, entries_left,
				&err_qp->ipz_squeue, 1);
		entries_left -= nr;
		current_wc += nr;

		if (entries_left == 0)
			break;
	}

	/* generate flush cqes for receive queues */
	list_for_each_entry(err_qp, &my_cq->rqp_err_list, rq_err_node) {
		nr = generate_flush_cqes(err_qp, cq, current_wc, entries_left,
				&err_qp->ipz_rqueue, 0);
		entries_left -= nr;
		current_wc += nr;

		if (entries_left == 0)
			break;
	}

	for (nr = 0; nr < entries_left; nr++) {
		ret = ehca_poll_cq_one(cq, current_wc);
		if (ret)
			break;
		current_wc++;
	} /* eof for nr */
	entries_left -= nr;

	spin_unlock_irqrestore(&my_cq->spinlock, flags);
	if (ret == -EAGAIN  || !ret)
		ret = num_entries - entries_left;

poll_cq_exit0:
	return ret;
}

int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags notify_flags)
{
	struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
	int ret = 0;

	switch (notify_flags & IB_CQ_SOLICITED_MASK) {
	case IB_CQ_SOLICITED:
		hipz_set_cqx_n0(my_cq, 1);
		break;
	case IB_CQ_NEXT_COMP:
		hipz_set_cqx_n1(my_cq, 1);
		break;
	default:
		return -EINVAL;
	}

	if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
		unsigned long spl_flags;
		spin_lock_irqsave(&my_cq->spinlock, spl_flags);
		ret = ipz_qeit_is_valid(&my_cq->ipz_queue);
		spin_unlock_irqrestore(&my_cq->spinlock, spl_flags);
	}

	return ret;
}