summaryrefslogtreecommitdiffstats
path: root/include/rdma/rdmavt_qp.h
blob: 2f91fae8d23f1c7bb8a283db6e2fa45c13492e49 (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
#ifndef DEF_RDMAVT_INCQP_H
#define DEF_RDMAVT_INCQP_H

/*
 * Copyright(c) 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 <rdma/rdma_vt.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdmavt_cq.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_PIO_DRAIN - waiting for a qp to drain pio packets
 * 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
 */
#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_PIO_DRAIN    0x0800
#define RVT_S_WAIT_TX		0x1000
#define RVT_S_WAIT_DMA_DESC	0x2000
#define RVT_S_WAIT_KMEM		0x4000
#define RVT_S_WAIT_PSN		0x8000
#define RVT_S_WAIT_ACK		0x10000
#define RVT_S_SEND_ONE		0x20000
#define RVT_S_UNLIMITED_CREDIT	0x40000
#define RVT_S_AHG_VALID		0x80000
#define RVT_S_AHG_CLEAR		0x100000
#define RVT_S_ECN		0x200000

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

/*
 * 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 ib_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 */
	struct rvt_sge sg_list[0];
};

/*
 * Receive work request queue entry.
 * The size of the sg_list is determined when the QP (or SRQ) is created
 * and stored in qp->r_rq.max_sge (or srq->rq.max_sge).
 */
struct rvt_rwqe {
	u64 wr_id;
	u8 num_sge;
	struct ib_sge sg_list[0];
};

/*
 * This structure is used to contain the head pointer, tail pointer,
 * and receive work queue entries as a single memory allocation so
 * it can be mmap'ed into user space.
 * Note that the wq array elements are variable size so you can't
 * just index into the array to get the N'th element;
 * use get_rwqe_ptr() instead.
 */
struct rvt_rwq {
	u32 head;               /* new work requests posted to the head */
	u32 tail;               /* receives pull requests from here. */
	struct rvt_rwqe wq[0];
};

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

/*
 * This structure is used by rvt_mmap() to validate an offset
 * when an mmap() request is made.  The vm_area_struct then uses
 * this as its vm_private_data.
 */
struct rvt_mmap_info {
	struct list_head pending_mmaps;
	struct ib_ucontext *context;
	void *obj;
	__u64 offset;
	struct kref ref;
	unsigned size;
};

/*
 * 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;
};

#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_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 ib_ah_attr remote_ah_attr;
	struct ib_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 */

	enum ib_mtu path_mtu;
	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 */
	u32 s_ahgpsn;           /* set to the psn in the copy of the header */

	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[] */

	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_cur_size;         /* size of send packet in bytes */
	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) */
	u16 s_hdrwords;         /* size of s_hdr in 32 bit words */
	u16 s_rdma_ack_cnt;
	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[] */

	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;
};

#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		    0xFFFFFF

/*
 * 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 {
	struct rb_node rb_node;
	union ib_gid mgid;
	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->wq->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)
{
	wqe->wr.send_flags |= RVT_SEND_RESERVE_USED;
	atomic_inc(&qp->s_reserved_used);
}

/**
 * rvt_qp_wqe_unreserve - clean reserved operation
 * @qp - the rvt qp
 * @wqe - the send wqe
 *
 * 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,
	struct rvt_swqe *wqe)
{
	if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED)) {
		wqe->wr.send_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[];

/**
 * rvt_qp_swqe_complete() - insert send completion
 * @qp - the qp
 * @wqe - the send wqe
 * @status - completion status
 *
 * 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.
 */
static inline void rvt_qp_swqe_complete(
	struct rvt_qp *qp,
	struct rvt_swqe *wqe,
	enum ib_wc_status status)
{
	if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED))
		return;
	if (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) ||
	    (wqe->wr.send_flags & IB_SEND_SIGNALED) ||
	     status != IB_WC_SUCCESS) {
		struct ib_wc wc;

		memset(&wc, 0, sizeof(wc));
		wc.wr_id = wqe->wr.wr_id;
		wc.status = status;
		wc.opcode = ib_rvt_wc_opcode[wqe->wr.opcode];
		wc.qp = &qp->ibqp;
		wc.byte_len = wqe->length;
		rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.send_cq), &wc,
			     status != IB_WC_SUCCESS);
	}
}

#define RVT_AETH_CREDIT_SHIFT	24
#define RVT_AETH_CREDIT_MASK	0x1F
#define RVT_AETH_NAK_SHIFT	29
#define RVT_MSN_MASK		0xFFFFFF

/*
 * 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;
}

/**
 * rvt_compute_aeth - compute the AETH (syndrome + MSN)
 * @qp: the queue pair to compute the AETH for
 *
 * Returns the AETH.
 */
__be32 rvt_compute_aeth(struct rvt_qp *qp);

/**
 * rvt_get_credit - flush the send work queue of a QP
 * @qp: the qp who's send work queue to flush
 * @aeth: the Acknowledge Extended Transport Header
 *
 * The QP s_lock should be held.
 */
void rvt_get_credit(struct rvt_qp *qp, u32 aeth);

/**
 * @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;
}

extern const int  ib_rvt_state_ops[];

struct rvt_dev_info;
void rvt_comm_est(struct rvt_qp *qp);
int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
void rvt_rc_error(struct rvt_qp *qp, enum ib_wc_status err);
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(struct rvt_qp *qp);

#endif          /* DEF_RDMAVT_INCQP_H */