summaryrefslogtreecommitdiff
path: root/include/rdma/rdmavt_qp.h
blob: 5fc10108703a43d41e5493f92e11f914afd70805 (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
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
#ifndef DEF_RDMAVT_INCQP_H
#define DEF_RDMAVT_INCQP_H

/*
 * Copyright(c) 2016 - 2019 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 <rdma/rdma_vt.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdmavt_cq.h>
#include <rdma/rvt-abi.h>
/*
 * Atomic bit definitions for r_aflags.
 */
#define RVT_R_WRID_VALID        0
#define RVT_R_REWIND_SGE        1

/*
 * Bit definitions for r_flags.
 */
#define RVT_R_REUSE_SGE 0x01
#define RVT_R_RDMAR_SEQ 0x02
#define RVT_R_RSP_NAK   0x04
#define RVT_R_RSP_SEND  0x08
#define RVT_R_COMM_EST  0x10

/*
 * Bit definitions for s_flags.
 *
 * RVT_S_SIGNAL_REQ_WR - set if QP send WRs contain completion signaled
 * RVT_S_BUSY - send tasklet is processing the QP
 * RVT_S_TIMER - the RC retry timer is active
 * RVT_S_ACK_PENDING - an ACK is waiting to be sent after RDMA read/atomics
 * RVT_S_WAIT_FENCE - waiting for all prior RDMA read or atomic SWQEs
 *                         before processing the next SWQE
 * RVT_S_WAIT_RDMAR - waiting for a RDMA read or atomic SWQE to complete
 *                         before processing the next SWQE
 * RVT_S_WAIT_RNR - waiting for RNR timeout
 * RVT_S_WAIT_SSN_CREDIT - waiting for RC credits to process next SWQE
 * RVT_S_WAIT_DMA - waiting for send DMA queue to drain before generating
 *                  next send completion entry not via send DMA
 * RVT_S_WAIT_PIO - waiting for a send buffer to be available
 * RVT_S_WAIT_TX - waiting for a struct verbs_txreq to be available
 * RVT_S_WAIT_DMA_DESC - waiting for DMA descriptors to be available
 * RVT_S_WAIT_KMEM - waiting for kernel memory to be available
 * RVT_S_WAIT_PSN - waiting for a packet to exit the send DMA queue
 * RVT_S_WAIT_ACK - waiting for an ACK packet before sending more requests
 * RVT_S_SEND_ONE - send one packet, request ACK, then wait for ACK
 * RVT_S_ECN - a BECN was queued to the send engine
 * RVT_S_MAX_BIT_MASK - The max bit that can be used by rdmavt
 */
#define RVT_S_SIGNAL_REQ_WR	0x0001
#define RVT_S_BUSY		0x0002
#define RVT_S_TIMER		0x0004
#define RVT_S_RESP_PENDING	0x0008
#define RVT_S_ACK_PENDING	0x0010
#define RVT_S_WAIT_FENCE	0x0020
#define RVT_S_WAIT_RDMAR	0x0040
#define RVT_S_WAIT_RNR		0x0080
#define RVT_S_WAIT_SSN_CREDIT	0x0100
#define RVT_S_WAIT_DMA		0x0200
#define RVT_S_WAIT_PIO		0x0400
#define RVT_S_WAIT_TX		0x0800
#define RVT_S_WAIT_DMA_DESC	0x1000
#define RVT_S_WAIT_KMEM		0x2000
#define RVT_S_WAIT_PSN		0x4000
#define RVT_S_WAIT_ACK		0x8000
#define RVT_S_SEND_ONE		0x10000
#define RVT_S_UNLIMITED_CREDIT	0x20000
#define RVT_S_ECN		0x40000
#define RVT_S_MAX_BIT_MASK	0x800000

/*
 * Drivers should use s_flags starting with bit 31 down to the bit next to
 * RVT_S_MAX_BIT_MASK
 */

/*
 * Wait flags that would prevent any packet type from being sent.
 */
#define RVT_S_ANY_WAIT_IO \
	(RVT_S_WAIT_PIO | RVT_S_WAIT_TX | \
	 RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM)

/*
 * Wait flags that would prevent send work requests from making progress.
 */
#define RVT_S_ANY_WAIT_SEND (RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | \
	RVT_S_WAIT_RNR | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_DMA | \
	RVT_S_WAIT_PSN | RVT_S_WAIT_ACK)

#define RVT_S_ANY_WAIT (RVT_S_ANY_WAIT_IO | RVT_S_ANY_WAIT_SEND)

/* Number of bits to pay attention to in the opcode for checking qp type */
#define RVT_OPCODE_QP_MASK 0xE0

/* Flags for checking QP state (see ib_rvt_state_ops[]) */
#define RVT_POST_SEND_OK                0x01
#define RVT_POST_RECV_OK                0x02
#define RVT_PROCESS_RECV_OK             0x04
#define RVT_PROCESS_SEND_OK             0x08
#define RVT_PROCESS_NEXT_SEND_OK        0x10
#define RVT_FLUSH_SEND			0x20
#define RVT_FLUSH_RECV			0x40
#define RVT_PROCESS_OR_FLUSH_SEND \
	(RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND)
#define RVT_SEND_OR_FLUSH_OR_RECV_OK \
	(RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND | RVT_PROCESS_RECV_OK)

/*
 * Internal send flags
 */
#define RVT_SEND_RESERVE_USED           IB_SEND_RESERVED_START
#define RVT_SEND_COMPLETION_ONLY	(IB_SEND_RESERVED_START << 1)

/**
 * rvt_ud_wr - IB UD work plus AH cache
 * @wr: valid IB work request
 * @attr: pointer to an allocated AH attribute
 *
 * Special case the UD WR so we can keep track of the AH attributes.
 *
 * NOTE: This data structure is stricly ordered wr then attr. I.e the attr
 * MUST come after wr.  The ib_ud_wr is sized and copied in rvt_post_one_wr.
 * The copy assumes that wr is first.
 */
struct rvt_ud_wr {
	struct ib_ud_wr wr;
	struct rdma_ah_attr *attr;
};

/*
 * Send work request queue entry.
 * The size of the sg_list is determined when the QP is created and stored
 * in qp->s_max_sge.
 */
struct rvt_swqe {
	union {
		struct ib_send_wr wr;   /* don't use wr.sg_list */
		struct rvt_ud_wr ud_wr;
		struct ib_reg_wr reg_wr;
		struct ib_rdma_wr rdma_wr;
		struct ib_atomic_wr atomic_wr;
	};
	u32 psn;                /* first packet sequence number */
	u32 lpsn;               /* last packet sequence number */
	u32 ssn;                /* send sequence number */
	u32 length;             /* total length of data in sg_list */
	void *priv;             /* driver dependent field */
	struct rvt_sge sg_list[];
};

/**
 * struct rvt_krwq - kernel struct receive work request
 * @p_lock: lock to protect producer of the kernel buffer
 * @head: index of next entry to fill
 * @c_lock:lock to protect consumer of the kernel buffer
 * @tail: index of next entry to pull
 * @count: count is aproximate of total receive enteries posted
 * @rvt_rwqe: struct of receive work request queue entry
 *
 * This structure is used to contain the head pointer,
 * tail pointer and receive work queue entries for kernel
 * mode user.
 */
struct rvt_krwq {
	spinlock_t p_lock;	/* protect producer */
	u32 head;               /* new work requests posted to the head */

	/* protect consumer */
	spinlock_t c_lock ____cacheline_aligned_in_smp;
	u32 tail;               /* receives pull requests from here. */
	u32 count;		/* approx count of receive entries posted */
	struct rvt_rwqe *curr_wq;
	struct rvt_rwqe wq[];
};

/*
 * rvt_get_swqe_ah - Return the pointer to the struct rvt_ah
 * @swqe: valid Send WQE
 *
 */
static inline struct rvt_ah *rvt_get_swqe_ah(struct rvt_swqe *swqe)
{
	return ibah_to_rvtah(swqe->ud_wr.wr.ah);
}

/**
 * rvt_get_swqe_ah_attr - Return the cached ah attribute information
 * @swqe: valid Send WQE
 *
 */
static inline struct rdma_ah_attr *rvt_get_swqe_ah_attr(struct rvt_swqe *swqe)
{
	return swqe->ud_wr.attr;
}

/**
 * rvt_get_swqe_remote_qpn - Access the remote QPN value
 * @swqe: valid Send WQE
 *
 */
static inline u32 rvt_get_swqe_remote_qpn(struct rvt_swqe *swqe)
{
	return swqe->ud_wr.wr.remote_qpn;
}

/**
 * rvt_get_swqe_remote_qkey - Acces the remote qkey value
 * @swqe: valid Send WQE
 *
 */
static inline u32 rvt_get_swqe_remote_qkey(struct rvt_swqe *swqe)
{
	return swqe->ud_wr.wr.remote_qkey;
}

/**
 * rvt_get_swqe_pkey_index - Access the pkey index
 * @swqe: valid Send WQE
 *
 */
static inline u16 rvt_get_swqe_pkey_index(struct rvt_swqe *swqe)
{
	return swqe->ud_wr.wr.pkey_index;
}

struct rvt_rq {
	struct rvt_rwq *wq;
	struct rvt_krwq *kwq;
	u32 size;               /* size of RWQE array */
	u8 max_sge;
	/* protect changes in this struct */
	spinlock_t lock ____cacheline_aligned_in_smp;
};

/*
 * This structure holds the information that the send tasklet needs
 * to send a RDMA read response or atomic operation.
 */
struct rvt_ack_entry {
	struct rvt_sge rdma_sge;
	u64 atomic_data;
	u32 psn;
	u32 lpsn;
	u8 opcode;
	u8 sent;
	void *priv;
};

#define	RC_QP_SCALING_INTERVAL	5

#define RVT_OPERATION_PRIV        0x00000001
#define RVT_OPERATION_ATOMIC      0x00000002
#define RVT_OPERATION_ATOMIC_SGE  0x00000004
#define RVT_OPERATION_LOCAL       0x00000008
#define RVT_OPERATION_USE_RESERVE 0x00000010
#define RVT_OPERATION_IGN_RNR_CNT 0x00000020

#define RVT_OPERATION_MAX (IB_WR_RESERVED10 + 1)

/**
 * rvt_operation_params - op table entry
 * @length - the length to copy into the swqe entry
 * @qpt_support - a bit mask indicating QP type support
 * @flags - RVT_OPERATION flags (see above)
 *
 * This supports table driven post send so that
 * the driver can have differing an potentially
 * different sets of operations.
 *
 **/

struct rvt_operation_params {
	size_t length;
	u32 qpt_support;
	u32 flags;
};

/*
 * Common variables are protected by both r_rq.lock and s_lock in that order
 * which only happens in modify_qp() or changing the QP 'state'.
 */
struct rvt_qp {
	struct ib_qp ibqp;
	void *priv; /* Driver private data */
	/* read mostly fields above and below */
	struct rdma_ah_attr remote_ah_attr;
	struct rdma_ah_attr alt_ah_attr;
	struct rvt_qp __rcu *next;           /* link list for QPN hash table */
	struct rvt_swqe *s_wq;  /* send work queue */
	struct rvt_mmap_info *ip;

	unsigned long timeout_jiffies;  /* computed from timeout */

	int srate_mbps;		/* s_srate (below) converted to Mbit/s */
	pid_t pid;		/* pid for user mode QPs */
	u32 remote_qpn;
	u32 qkey;               /* QKEY for this QP (for UD or RD) */
	u32 s_size;             /* send work queue size */

	u16 pmtu;		/* decoded from path_mtu */
	u8 log_pmtu;		/* shift for pmtu */
	u8 state;               /* QP state */
	u8 allowed_ops;		/* high order bits of allowed opcodes */
	u8 qp_access_flags;
	u8 alt_timeout;         /* Alternate path timeout for this QP */
	u8 timeout;             /* Timeout for this QP */
	u8 s_srate;
	u8 s_mig_state;
	u8 port_num;
	u8 s_pkey_index;        /* PKEY index to use */
	u8 s_alt_pkey_index;    /* Alternate path PKEY index to use */
	u8 r_max_rd_atomic;     /* max number of RDMA read/atomic to receive */
	u8 s_max_rd_atomic;     /* max number of RDMA read/atomic to send */
	u8 s_retry_cnt;         /* number of times to retry */
	u8 s_rnr_retry_cnt;
	u8 r_min_rnr_timer;     /* retry timeout value for RNR NAKs */
	u8 s_max_sge;           /* size of s_wq->sg_list */
	u8 s_draining;

	/* start of read/write fields */
	atomic_t refcount ____cacheline_aligned_in_smp;
	wait_queue_head_t wait;

	struct rvt_ack_entry *s_ack_queue;
	struct rvt_sge_state s_rdma_read_sge;

	spinlock_t r_lock ____cacheline_aligned_in_smp;      /* used for APM */
	u32 r_psn;              /* expected rcv packet sequence number */
	unsigned long r_aflags;
	u64 r_wr_id;            /* ID for current receive WQE */
	u32 r_ack_psn;          /* PSN for next ACK or atomic ACK */
	u32 r_len;              /* total length of r_sge */
	u32 r_rcv_len;          /* receive data len processed */
	u32 r_msn;              /* message sequence number */

	u8 r_state;             /* opcode of last packet received */
	u8 r_flags;
	u8 r_head_ack_queue;    /* index into s_ack_queue[] */
	u8 r_adefered;          /* defered ack count */

	struct list_head rspwait;       /* link for waiting to respond */

	struct rvt_sge_state r_sge;     /* current receive data */
	struct rvt_rq r_rq;             /* receive work queue */

	/* post send line */
	spinlock_t s_hlock ____cacheline_aligned_in_smp;
	u32 s_head;             /* new entries added here */
	u32 s_next_psn;         /* PSN for next request */
	u32 s_avail;            /* number of entries avail */
	u32 s_ssn;              /* SSN of tail entry */
	atomic_t s_reserved_used; /* reserved entries in use */

	spinlock_t s_lock ____cacheline_aligned_in_smp;
	u32 s_flags;
	struct rvt_sge_state *s_cur_sge;
	struct rvt_swqe *s_wqe;
	struct rvt_sge_state s_sge;     /* current send request data */
	struct rvt_mregion *s_rdma_mr;
	u32 s_len;              /* total length of s_sge */
	u32 s_rdma_read_len;    /* total length of s_rdma_read_sge */
	u32 s_last_psn;         /* last response PSN processed */
	u32 s_sending_psn;      /* lowest PSN that is being sent */
	u32 s_sending_hpsn;     /* highest PSN that is being sent */
	u32 s_psn;              /* current packet sequence number */
	u32 s_ack_rdma_psn;     /* PSN for sending RDMA read responses */
	u32 s_ack_psn;          /* PSN for acking sends and RDMA writes */
	u32 s_tail;             /* next entry to process */
	u32 s_cur;              /* current work queue entry */
	u32 s_acked;            /* last un-ACK'ed entry */
	u32 s_last;             /* last completed entry */
	u32 s_lsn;              /* limit sequence number (credit) */
	u32 s_ahgpsn;           /* set to the psn in the copy of the header */
	u16 s_cur_size;         /* size of send packet in bytes */
	u16 s_rdma_ack_cnt;
	u8 s_hdrwords;         /* size of s_hdr in 32 bit words */
	s8 s_ahgidx;
	u8 s_state;             /* opcode of last packet sent */
	u8 s_ack_state;         /* opcode of packet to ACK */
	u8 s_nak_state;         /* non-zero if NAK is pending */
	u8 r_nak_state;         /* non-zero if NAK is pending */
	u8 s_retry;             /* requester retry counter */
	u8 s_rnr_retry;         /* requester RNR retry counter */
	u8 s_num_rd_atomic;     /* number of RDMA read/atomic pending */
	u8 s_tail_ack_queue;    /* index into s_ack_queue[] */
	u8 s_acked_ack_queue;   /* index into s_ack_queue[] */

	struct rvt_sge_state s_ack_rdma_sge;
	struct timer_list s_timer;
	struct hrtimer s_rnr_timer;

	atomic_t local_ops_pending; /* number of fast_reg/local_inv reqs */

	/*
	 * This sge list MUST be last. Do not add anything below here.
	 */
	struct rvt_sge r_sg_list[0] /* verified SGEs */
		____cacheline_aligned_in_smp;
};

struct rvt_srq {
	struct ib_srq ibsrq;
	struct rvt_rq rq;
	struct rvt_mmap_info *ip;
	/* send signal when number of RWQEs < limit */
	u32 limit;
};

static inline struct rvt_srq *ibsrq_to_rvtsrq(struct ib_srq *ibsrq)
{
	return container_of(ibsrq, struct rvt_srq, ibsrq);
}

static inline struct rvt_qp *ibqp_to_rvtqp(struct ib_qp *ibqp)
{
	return container_of(ibqp, struct rvt_qp, ibqp);
}

#define RVT_QPN_MAX                 BIT(24)
#define RVT_QPNMAP_ENTRIES          (RVT_QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
#define RVT_BITS_PER_PAGE           (PAGE_SIZE * BITS_PER_BYTE)
#define RVT_BITS_PER_PAGE_MASK      (RVT_BITS_PER_PAGE - 1)
#define RVT_QPN_MASK		    IB_QPN_MASK

/*
 * QPN-map pages start out as NULL, they get allocated upon
 * first use and are never deallocated. This way,
 * large bitmaps are not allocated unless large numbers of QPs are used.
 */
struct rvt_qpn_map {
	void *page;
};

struct rvt_qpn_table {
	spinlock_t lock; /* protect changes to the qp table */
	unsigned flags;         /* flags for QP0/1 allocated for each port */
	u32 last;               /* last QP number allocated */
	u32 nmaps;              /* size of the map table */
	u16 limit;
	u8  incr;
	/* bit map of free QP numbers other than 0/1 */
	struct rvt_qpn_map map[RVT_QPNMAP_ENTRIES];
};

struct rvt_qp_ibdev {
	u32 qp_table_size;
	u32 qp_table_bits;
	struct rvt_qp __rcu **qp_table;
	spinlock_t qpt_lock; /* qptable lock */
	struct rvt_qpn_table qpn_table;
};

/*
 * There is one struct rvt_mcast for each multicast GID.
 * All attached QPs are then stored as a list of
 * struct rvt_mcast_qp.
 */
struct rvt_mcast_qp {
	struct list_head list;
	struct rvt_qp *qp;
};

struct rvt_mcast_addr {
	union ib_gid mgid;
	u16 lid;
};

struct rvt_mcast {
	struct rb_node rb_node;
	struct rvt_mcast_addr mcast_addr;
	struct list_head qp_list;
	wait_queue_head_t wait;
	atomic_t refcount;
	int n_attached;
};

/*
 * Since struct rvt_swqe is not a fixed size, we can't simply index into
 * struct rvt_qp.s_wq.  This function does the array index computation.
 */
static inline struct rvt_swqe *rvt_get_swqe_ptr(struct rvt_qp *qp,
						unsigned n)
{
	return (struct rvt_swqe *)((char *)qp->s_wq +
				     (sizeof(struct rvt_swqe) +
				      qp->s_max_sge *
				      sizeof(struct rvt_sge)) * n);
}

/*
 * Since struct rvt_rwqe is not a fixed size, we can't simply index into
 * struct rvt_rwq.wq.  This function does the array index computation.
 */
static inline struct rvt_rwqe *rvt_get_rwqe_ptr(struct rvt_rq *rq, unsigned n)
{
	return (struct rvt_rwqe *)
		((char *)rq->kwq->curr_wq +
		 (sizeof(struct rvt_rwqe) +
		  rq->max_sge * sizeof(struct ib_sge)) * n);
}

/**
 * rvt_is_user_qp - return if this is user mode QP
 * @qp - the target QP
 */
static inline bool rvt_is_user_qp(struct rvt_qp *qp)
{
	return !!qp->pid;
}

/**
 * rvt_get_qp - get a QP reference
 * @qp - the QP to hold
 */
static inline void rvt_get_qp(struct rvt_qp *qp)
{
	atomic_inc(&qp->refcount);
}

/**
 * rvt_put_qp - release a QP reference
 * @qp - the QP to release
 */
static inline void rvt_put_qp(struct rvt_qp *qp)
{
	if (qp && atomic_dec_and_test(&qp->refcount))
		wake_up(&qp->wait);
}

/**
 * rvt_put_swqe - drop mr refs held by swqe
 * @wqe - the send wqe
 *
 * This drops any mr references held by the swqe
 */
static inline void rvt_put_swqe(struct rvt_swqe *wqe)
{
	int i;

	for (i = 0; i < wqe->wr.num_sge; i++) {
		struct rvt_sge *sge = &wqe->sg_list[i];

		rvt_put_mr(sge->mr);
	}
}

/**
 * rvt_qp_wqe_reserve - reserve operation
 * @qp - the rvt qp
 * @wqe - the send wqe
 *
 * This routine used in post send to record
 * a wqe relative reserved operation use.
 */
static inline void rvt_qp_wqe_reserve(
	struct rvt_qp *qp,
	struct rvt_swqe *wqe)
{
	atomic_inc(&qp->s_reserved_used);
}

/**
 * rvt_qp_wqe_unreserve - clean reserved operation
 * @qp - the rvt qp
 * @flags - send wqe flags
 *
 * This decrements the reserve use count.
 *
 * This call MUST precede the change to
 * s_last to insure that post send sees a stable
 * s_avail.
 *
 * An smp_mp__after_atomic() is used to insure
 * the compiler does not juggle the order of the s_last
 * ring index and the decrementing of s_reserved_used.
 */
static inline void rvt_qp_wqe_unreserve(struct rvt_qp *qp, int flags)
{
	if (unlikely(flags & RVT_SEND_RESERVE_USED)) {
		atomic_dec(&qp->s_reserved_used);
		/* insure no compiler re-order up to s_last change */
		smp_mb__after_atomic();
	}
}

extern const enum ib_wc_opcode ib_rvt_wc_opcode[];

/*
 * Compare the lower 24 bits of the msn values.
 * Returns an integer <, ==, or > than zero.
 */
static inline int rvt_cmp_msn(u32 a, u32 b)
{
	return (((int)a) - ((int)b)) << 8;
}

__be32 rvt_compute_aeth(struct rvt_qp *qp);

void rvt_get_credit(struct rvt_qp *qp, u32 aeth);

u32 rvt_restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, u32 len);

/**
 * rvt_div_round_up_mtu - round up divide
 * @qp - the qp pair
 * @len - the length
 *
 * Perform a shift based mtu round up divide
 */
static inline u32 rvt_div_round_up_mtu(struct rvt_qp *qp, u32 len)
{
	return (len + qp->pmtu - 1) >> qp->log_pmtu;
}

/**
 * @qp - the qp pair
 * @len - the length
 *
 * Perform a shift based mtu divide
 */
static inline u32 rvt_div_mtu(struct rvt_qp *qp, u32 len)
{
	return len >> qp->log_pmtu;
}

/**
 * rvt_timeout_to_jiffies - Convert a ULP timeout input into jiffies
 * @timeout - timeout input(0 - 31).
 *
 * Return a timeout value in jiffies.
 */
static inline unsigned long rvt_timeout_to_jiffies(u8 timeout)
{
	if (timeout > 31)
		timeout = 31;

	return usecs_to_jiffies(1U << timeout) * 4096UL / 1000UL;
}

/**
 * rvt_lookup_qpn - return the QP with the given QPN
 * @ibp: the ibport
 * @qpn: the QP number to look up
 *
 * The caller must hold the rcu_read_lock(), and keep the lock until
 * the returned qp is no longer in use.
 */
static inline struct rvt_qp *rvt_lookup_qpn(struct rvt_dev_info *rdi,
					    struct rvt_ibport *rvp,
					    u32 qpn) __must_hold(RCU)
{
	struct rvt_qp *qp = NULL;

	if (unlikely(qpn <= 1)) {
		qp = rcu_dereference(rvp->qp[qpn]);
	} else {
		u32 n = hash_32(qpn, rdi->qp_dev->qp_table_bits);

		for (qp = rcu_dereference(rdi->qp_dev->qp_table[n]); qp;
			qp = rcu_dereference(qp->next))
			if (qp->ibqp.qp_num == qpn)
				break;
	}
	return qp;
}

/**
 * rvt_mod_retry_timer - mod a retry timer
 * @qp - the QP
 * @shift - timeout shift to wait for multiple packets
 * Modify a potentially already running retry timer
 */
static inline void rvt_mod_retry_timer_ext(struct rvt_qp *qp, u8 shift)
{
	struct ib_qp *ibqp = &qp->ibqp;
	struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);

	lockdep_assert_held(&qp->s_lock);
	qp->s_flags |= RVT_S_TIMER;
	/* 4.096 usec. * (1 << qp->timeout) */
	mod_timer(&qp->s_timer, jiffies + rdi->busy_jiffies +
		  (qp->timeout_jiffies << shift));
}

static inline void rvt_mod_retry_timer(struct rvt_qp *qp)
{
	return rvt_mod_retry_timer_ext(qp, 0);
}

/**
 * rvt_put_qp_swqe - drop refs held by swqe
 * @qp: the send qp
 * @wqe: the send wqe
 *
 * This drops any references held by the swqe
 */
static inline void rvt_put_qp_swqe(struct rvt_qp *qp, struct rvt_swqe *wqe)
{
	rvt_put_swqe(wqe);
	if (qp->allowed_ops == IB_OPCODE_UD)
		rdma_destroy_ah_attr(wqe->ud_wr.attr);
}

/**
 * rvt_qp_sqwe_incr - increment ring index
 * @qp: the qp
 * @val: the starting value
 *
 * Return: the new value wrapping as appropriate
 */
static inline u32
rvt_qp_swqe_incr(struct rvt_qp *qp, u32 val)
{
	if (++val >= qp->s_size)
		val = 0;
	return val;
}

int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);

/**
 * rvt_recv_cq - add a new entry to completion queue
 *			by receive queue
 * @qp: receive queue
 * @wc: work completion entry to add
 * @solicited: true if @entry is solicited
 *
 * This is wrapper function for rvt_enter_cq function call by
 * receive queue. If rvt_cq_enter return false, it means cq is
 * full and the qp is put into error state.
 */
static inline void rvt_recv_cq(struct rvt_qp *qp, struct ib_wc *wc,
			       bool solicited)
{
	struct rvt_cq *cq = ibcq_to_rvtcq(qp->ibqp.recv_cq);

	if (unlikely(!rvt_cq_enter(cq, wc, solicited)))
		rvt_error_qp(qp, IB_WC_LOC_QP_OP_ERR);
}

/**
 * rvt_send_cq - add a new entry to completion queue
 *                        by send queue
 * @qp: send queue
 * @wc: work completion entry to add
 * @solicited: true if @entry is solicited
 *
 * This is wrapper function for rvt_enter_cq function call by
 * send queue. If rvt_cq_enter return false, it means cq is
 * full and the qp is put into error state.
 */
static inline void rvt_send_cq(struct rvt_qp *qp, struct ib_wc *wc,
			       bool solicited)
{
	struct rvt_cq *cq = ibcq_to_rvtcq(qp->ibqp.send_cq);

	if (unlikely(!rvt_cq_enter(cq, wc, solicited)))
		rvt_error_qp(qp, IB_WC_LOC_QP_OP_ERR);
}

/**
 * rvt_qp_complete_swqe - insert send completion
 * @qp - the qp
 * @wqe - the send wqe
 * @opcode - wc operation (driver dependent)
 * @status - completion status
 *
 * Update the s_last information, and then insert a send
 * completion into the completion
 * queue if the qp indicates it should be done.
 *
 * See IBTA 10.7.3.1 for info on completion
 * control.
 *
 * Return: new last
 */
static inline u32
rvt_qp_complete_swqe(struct rvt_qp *qp,
		     struct rvt_swqe *wqe,
		     enum ib_wc_opcode opcode,
		     enum ib_wc_status status)
{
	bool need_completion;
	u64 wr_id;
	u32 byte_len, last;
	int flags = wqe->wr.send_flags;

	rvt_qp_wqe_unreserve(qp, flags);
	rvt_put_qp_swqe(qp, wqe);

	need_completion =
		!(flags & RVT_SEND_RESERVE_USED) &&
		(!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) ||
		(flags & IB_SEND_SIGNALED) ||
		status != IB_WC_SUCCESS);
	if (need_completion) {
		wr_id = wqe->wr.wr_id;
		byte_len = wqe->length;
		/* above fields required before writing s_last */
	}
	last = rvt_qp_swqe_incr(qp, qp->s_last);
	/* see rvt_qp_is_avail() */
	smp_store_release(&qp->s_last, last);
	if (need_completion) {
		struct ib_wc w = {
			.wr_id = wr_id,
			.status = status,
			.opcode = opcode,
			.qp = &qp->ibqp,
			.byte_len = byte_len,
		};
		rvt_send_cq(qp, &w, status != IB_WC_SUCCESS);
	}
	return last;
}

extern const int  ib_rvt_state_ops[];

struct rvt_dev_info;
int rvt_get_rwqe(struct rvt_qp *qp, bool wr_id_only);
void rvt_comm_est(struct rvt_qp *qp);
void rvt_rc_error(struct rvt_qp *qp, enum ib_wc_status err);
unsigned long rvt_rnr_tbl_to_usec(u32 index);
enum hrtimer_restart rvt_rc_rnr_retry(struct hrtimer *t);
void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth);
void rvt_del_timers_sync(struct rvt_qp *qp);
void rvt_stop_rc_timers(struct rvt_qp *qp);
void rvt_add_retry_timer_ext(struct rvt_qp *qp, u8 shift);
static inline void rvt_add_retry_timer(struct rvt_qp *qp)
{
	rvt_add_retry_timer_ext(qp, 0);
}

void rvt_copy_sge(struct rvt_qp *qp, struct rvt_sge_state *ss,
		  void *data, u32 length,
		  bool release, bool copy_last);
void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
		       enum ib_wc_status status);
void rvt_ruc_loopback(struct rvt_qp *qp);

/**
 * struct rvt_qp_iter - the iterator for QPs
 * @qp - the current QP
 *
 * This structure defines the current iterator
 * state for sequenced access to all QPs relative
 * to an rvt_dev_info.
 */
struct rvt_qp_iter {
	struct rvt_qp *qp;
	/* private: backpointer */
	struct rvt_dev_info *rdi;
	/* private: callback routine */
	void (*cb)(struct rvt_qp *qp, u64 v);
	/* private: for arg to callback routine */
	u64 v;
	/* private: number of SMI,GSI QPs for device */
	int specials;
	/* private: current iterator index */
	int n;
};

/**
 * ib_cq_tail - Return tail index of cq buffer
 * @send_cq - The cq for send
 *
 * This is called in qp_iter_print to get tail
 * of cq buffer.
 */
static inline u32 ib_cq_tail(struct ib_cq *send_cq)
{
	struct rvt_cq *cq = ibcq_to_rvtcq(send_cq);

	return ibcq_to_rvtcq(send_cq)->ip ?
	       RDMA_READ_UAPI_ATOMIC(cq->queue->tail) :
	       ibcq_to_rvtcq(send_cq)->kqueue->tail;
}

/**
 * ib_cq_head - Return head index of cq buffer
 * @send_cq - The cq for send
 *
 * This is called in qp_iter_print to get head
 * of cq buffer.
 */
static inline u32 ib_cq_head(struct ib_cq *send_cq)
{
	struct rvt_cq *cq = ibcq_to_rvtcq(send_cq);

	return ibcq_to_rvtcq(send_cq)->ip ?
	       RDMA_READ_UAPI_ATOMIC(cq->queue->head) :
	       ibcq_to_rvtcq(send_cq)->kqueue->head;
}

/**
 * rvt_free_rq - free memory allocated for rvt_rq struct
 * @rvt_rq: request queue data structure
 *
 * This function should only be called if the rvt_mmap_info()
 * has not succeeded.
 */
static inline void rvt_free_rq(struct rvt_rq *rq)
{
	kvfree(rq->kwq);
	rq->kwq = NULL;
	vfree(rq->wq);
	rq->wq = NULL;
}

/**
 * rvt_to_iport - Get the ibport pointer
 * @qp: the qp pointer
 *
 * This function returns the ibport pointer from the qp pointer.
 */
static inline struct rvt_ibport *rvt_to_iport(struct rvt_qp *qp)
{
	struct rvt_dev_info *rdi = ib_to_rvt(qp->ibqp.device);

	return rdi->ports[qp->port_num - 1];
}

/**
 * rvt_rc_credit_avail - Check if there are enough RC credits for the request
 * @qp: the qp
 * @wqe: the request
 *
 * This function returns false when there are not enough credits for the given
 * request and true otherwise.
 */
static inline bool rvt_rc_credit_avail(struct rvt_qp *qp, struct rvt_swqe *wqe)
{
	lockdep_assert_held(&qp->s_lock);
	if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) &&
	    rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) {
		struct rvt_ibport *rvp = rvt_to_iport(qp);

		qp->s_flags |= RVT_S_WAIT_SSN_CREDIT;
		rvp->n_rc_crwaits++;
		return false;
	}
	return true;
}

struct rvt_qp_iter *rvt_qp_iter_init(struct rvt_dev_info *rdi,
				     u64 v,
				     void (*cb)(struct rvt_qp *qp, u64 v));
int rvt_qp_iter_next(struct rvt_qp_iter *iter);
void rvt_qp_iter(struct rvt_dev_info *rdi,
		 u64 v,
		 void (*cb)(struct rvt_qp *qp, u64 v));
void rvt_qp_mr_clean(struct rvt_qp *qp, u32 lkey);
#endif          /* DEF_RDMAVT_INCQP_H */