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TOMOYO Linux Cross Reference
Linux/include/rdma/rdmavt_qp.h

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  1 #ifndef DEF_RDMAVT_INCQP_H
  2 #define DEF_RDMAVT_INCQP_H
  3 
  4 /*
  5  * Copyright(c) 2016 Intel Corporation.
  6  *
  7  * This file is provided under a dual BSD/GPLv2 license.  When using or
  8  * redistributing this file, you may do so under either license.
  9  *
 10  * GPL LICENSE SUMMARY
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of version 2 of the GNU General Public License as
 14  * published by the Free Software Foundation.
 15  *
 16  * This program is distributed in the hope that it will be useful, but
 17  * WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 19  * General Public License for more details.
 20  *
 21  * BSD LICENSE
 22  *
 23  * Redistribution and use in source and binary forms, with or without
 24  * modification, are permitted provided that the following conditions
 25  * are met:
 26  *
 27  *  - Redistributions of source code must retain the above copyright
 28  *    notice, this list of conditions and the following disclaimer.
 29  *  - Redistributions in binary form must reproduce the above copyright
 30  *    notice, this list of conditions and the following disclaimer in
 31  *    the documentation and/or other materials provided with the
 32  *    distribution.
 33  *  - Neither the name of Intel Corporation nor the names of its
 34  *    contributors may be used to endorse or promote products derived
 35  *    from this software without specific prior written permission.
 36  *
 37  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 38  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 39  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 40  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 41  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 44  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 45  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 46  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 47  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 48  *
 49  */
 50 
 51 #include <rdma/rdma_vt.h>
 52 #include <rdma/ib_pack.h>
 53 #include <rdma/ib_verbs.h>
 54 #include <rdma/rdmavt_cq.h>
 55 /*
 56  * Atomic bit definitions for r_aflags.
 57  */
 58 #define RVT_R_WRID_VALID        0
 59 #define RVT_R_REWIND_SGE        1
 60 
 61 /*
 62  * Bit definitions for r_flags.
 63  */
 64 #define RVT_R_REUSE_SGE 0x01
 65 #define RVT_R_RDMAR_SEQ 0x02
 66 #define RVT_R_RSP_NAK   0x04
 67 #define RVT_R_RSP_SEND  0x08
 68 #define RVT_R_COMM_EST  0x10
 69 
 70 /*
 71  * Bit definitions for s_flags.
 72  *
 73  * RVT_S_SIGNAL_REQ_WR - set if QP send WRs contain completion signaled
 74  * RVT_S_BUSY - send tasklet is processing the QP
 75  * RVT_S_TIMER - the RC retry timer is active
 76  * RVT_S_ACK_PENDING - an ACK is waiting to be sent after RDMA read/atomics
 77  * RVT_S_WAIT_FENCE - waiting for all prior RDMA read or atomic SWQEs
 78  *                         before processing the next SWQE
 79  * RVT_S_WAIT_RDMAR - waiting for a RDMA read or atomic SWQE to complete
 80  *                         before processing the next SWQE
 81  * RVT_S_WAIT_RNR - waiting for RNR timeout
 82  * RVT_S_WAIT_SSN_CREDIT - waiting for RC credits to process next SWQE
 83  * RVT_S_WAIT_DMA - waiting for send DMA queue to drain before generating
 84  *                  next send completion entry not via send DMA
 85  * RVT_S_WAIT_PIO - waiting for a send buffer to be available
 86  * RVT_S_WAIT_PIO_DRAIN - waiting for a qp to drain pio packets
 87  * RVT_S_WAIT_TX - waiting for a struct verbs_txreq to be available
 88  * RVT_S_WAIT_DMA_DESC - waiting for DMA descriptors to be available
 89  * RVT_S_WAIT_KMEM - waiting for kernel memory to be available
 90  * RVT_S_WAIT_PSN - waiting for a packet to exit the send DMA queue
 91  * RVT_S_WAIT_ACK - waiting for an ACK packet before sending more requests
 92  * RVT_S_SEND_ONE - send one packet, request ACK, then wait for ACK
 93  * RVT_S_ECN - a BECN was queued to the send engine
 94  */
 95 #define RVT_S_SIGNAL_REQ_WR     0x0001
 96 #define RVT_S_BUSY              0x0002
 97 #define RVT_S_TIMER             0x0004
 98 #define RVT_S_RESP_PENDING      0x0008
 99 #define RVT_S_ACK_PENDING       0x0010
100 #define RVT_S_WAIT_FENCE        0x0020
101 #define RVT_S_WAIT_RDMAR        0x0040
102 #define RVT_S_WAIT_RNR          0x0080
103 #define RVT_S_WAIT_SSN_CREDIT   0x0100
104 #define RVT_S_WAIT_DMA          0x0200
105 #define RVT_S_WAIT_PIO          0x0400
106 #define RVT_S_WAIT_PIO_DRAIN    0x0800
107 #define RVT_S_WAIT_TX           0x1000
108 #define RVT_S_WAIT_DMA_DESC     0x2000
109 #define RVT_S_WAIT_KMEM         0x4000
110 #define RVT_S_WAIT_PSN          0x8000
111 #define RVT_S_WAIT_ACK          0x10000
112 #define RVT_S_SEND_ONE          0x20000
113 #define RVT_S_UNLIMITED_CREDIT  0x40000
114 #define RVT_S_AHG_VALID         0x80000
115 #define RVT_S_AHG_CLEAR         0x100000
116 #define RVT_S_ECN               0x200000
117 
118 /*
119  * Wait flags that would prevent any packet type from being sent.
120  */
121 #define RVT_S_ANY_WAIT_IO \
122         (RVT_S_WAIT_PIO | RVT_S_WAIT_PIO_DRAIN | RVT_S_WAIT_TX | \
123          RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM)
124 
125 /*
126  * Wait flags that would prevent send work requests from making progress.
127  */
128 #define RVT_S_ANY_WAIT_SEND (RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | \
129         RVT_S_WAIT_RNR | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_DMA | \
130         RVT_S_WAIT_PSN | RVT_S_WAIT_ACK)
131 
132 #define RVT_S_ANY_WAIT (RVT_S_ANY_WAIT_IO | RVT_S_ANY_WAIT_SEND)
133 
134 /* Number of bits to pay attention to in the opcode for checking qp type */
135 #define RVT_OPCODE_QP_MASK 0xE0
136 
137 /* Flags for checking QP state (see ib_rvt_state_ops[]) */
138 #define RVT_POST_SEND_OK                0x01
139 #define RVT_POST_RECV_OK                0x02
140 #define RVT_PROCESS_RECV_OK             0x04
141 #define RVT_PROCESS_SEND_OK             0x08
142 #define RVT_PROCESS_NEXT_SEND_OK        0x10
143 #define RVT_FLUSH_SEND                  0x20
144 #define RVT_FLUSH_RECV                  0x40
145 #define RVT_PROCESS_OR_FLUSH_SEND \
146         (RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND)
147 #define RVT_SEND_OR_FLUSH_OR_RECV_OK \
148         (RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND | RVT_PROCESS_RECV_OK)
149 
150 /*
151  * Internal send flags
152  */
153 #define RVT_SEND_RESERVE_USED           IB_SEND_RESERVED_START
154 #define RVT_SEND_COMPLETION_ONLY        (IB_SEND_RESERVED_START << 1)
155 
156 /*
157  * Send work request queue entry.
158  * The size of the sg_list is determined when the QP is created and stored
159  * in qp->s_max_sge.
160  */
161 struct rvt_swqe {
162         union {
163                 struct ib_send_wr wr;   /* don't use wr.sg_list */
164                 struct ib_ud_wr ud_wr;
165                 struct ib_reg_wr reg_wr;
166                 struct ib_rdma_wr rdma_wr;
167                 struct ib_atomic_wr atomic_wr;
168         };
169         u32 psn;                /* first packet sequence number */
170         u32 lpsn;               /* last packet sequence number */
171         u32 ssn;                /* send sequence number */
172         u32 length;             /* total length of data in sg_list */
173         struct rvt_sge sg_list[0];
174 };
175 
176 /*
177  * Receive work request queue entry.
178  * The size of the sg_list is determined when the QP (or SRQ) is created
179  * and stored in qp->r_rq.max_sge (or srq->rq.max_sge).
180  */
181 struct rvt_rwqe {
182         u64 wr_id;
183         u8 num_sge;
184         struct ib_sge sg_list[0];
185 };
186 
187 /*
188  * This structure is used to contain the head pointer, tail pointer,
189  * and receive work queue entries as a single memory allocation so
190  * it can be mmap'ed into user space.
191  * Note that the wq array elements are variable size so you can't
192  * just index into the array to get the N'th element;
193  * use get_rwqe_ptr() instead.
194  */
195 struct rvt_rwq {
196         u32 head;               /* new work requests posted to the head */
197         u32 tail;               /* receives pull requests from here. */
198         struct rvt_rwqe wq[0];
199 };
200 
201 struct rvt_rq {
202         struct rvt_rwq *wq;
203         u32 size;               /* size of RWQE array */
204         u8 max_sge;
205         /* protect changes in this struct */
206         spinlock_t lock ____cacheline_aligned_in_smp;
207 };
208 
209 /*
210  * This structure is used by rvt_mmap() to validate an offset
211  * when an mmap() request is made.  The vm_area_struct then uses
212  * this as its vm_private_data.
213  */
214 struct rvt_mmap_info {
215         struct list_head pending_mmaps;
216         struct ib_ucontext *context;
217         void *obj;
218         __u64 offset;
219         struct kref ref;
220         unsigned size;
221 };
222 
223 /*
224  * This structure holds the information that the send tasklet needs
225  * to send a RDMA read response or atomic operation.
226  */
227 struct rvt_ack_entry {
228         struct rvt_sge rdma_sge;
229         u64 atomic_data;
230         u32 psn;
231         u32 lpsn;
232         u8 opcode;
233         u8 sent;
234 };
235 
236 #define RC_QP_SCALING_INTERVAL  5
237 
238 #define RVT_OPERATION_PRIV        0x00000001
239 #define RVT_OPERATION_ATOMIC      0x00000002
240 #define RVT_OPERATION_ATOMIC_SGE  0x00000004
241 #define RVT_OPERATION_LOCAL       0x00000008
242 #define RVT_OPERATION_USE_RESERVE 0x00000010
243 
244 #define RVT_OPERATION_MAX (IB_WR_RESERVED10 + 1)
245 
246 /**
247  * rvt_operation_params - op table entry
248  * @length - the length to copy into the swqe entry
249  * @qpt_support - a bit mask indicating QP type support
250  * @flags - RVT_OPERATION flags (see above)
251  *
252  * This supports table driven post send so that
253  * the driver can have differing an potentially
254  * different sets of operations.
255  *
256  **/
257 
258 struct rvt_operation_params {
259         size_t length;
260         u32 qpt_support;
261         u32 flags;
262 };
263 
264 /*
265  * Common variables are protected by both r_rq.lock and s_lock in that order
266  * which only happens in modify_qp() or changing the QP 'state'.
267  */
268 struct rvt_qp {
269         struct ib_qp ibqp;
270         void *priv; /* Driver private data */
271         /* read mostly fields above and below */
272         struct ib_ah_attr remote_ah_attr;
273         struct ib_ah_attr alt_ah_attr;
274         struct rvt_qp __rcu *next;           /* link list for QPN hash table */
275         struct rvt_swqe *s_wq;  /* send work queue */
276         struct rvt_mmap_info *ip;
277 
278         unsigned long timeout_jiffies;  /* computed from timeout */
279 
280         enum ib_mtu path_mtu;
281         int srate_mbps;         /* s_srate (below) converted to Mbit/s */
282         pid_t pid;              /* pid for user mode QPs */
283         u32 remote_qpn;
284         u32 qkey;               /* QKEY for this QP (for UD or RD) */
285         u32 s_size;             /* send work queue size */
286         u32 s_ahgpsn;           /* set to the psn in the copy of the header */
287 
288         u16 pmtu;               /* decoded from path_mtu */
289         u8 log_pmtu;            /* shift for pmtu */
290         u8 state;               /* QP state */
291         u8 allowed_ops;         /* high order bits of allowed opcodes */
292         u8 qp_access_flags;
293         u8 alt_timeout;         /* Alternate path timeout for this QP */
294         u8 timeout;             /* Timeout for this QP */
295         u8 s_srate;
296         u8 s_mig_state;
297         u8 port_num;
298         u8 s_pkey_index;        /* PKEY index to use */
299         u8 s_alt_pkey_index;    /* Alternate path PKEY index to use */
300         u8 r_max_rd_atomic;     /* max number of RDMA read/atomic to receive */
301         u8 s_max_rd_atomic;     /* max number of RDMA read/atomic to send */
302         u8 s_retry_cnt;         /* number of times to retry */
303         u8 s_rnr_retry_cnt;
304         u8 r_min_rnr_timer;     /* retry timeout value for RNR NAKs */
305         u8 s_max_sge;           /* size of s_wq->sg_list */
306         u8 s_draining;
307 
308         /* start of read/write fields */
309         atomic_t refcount ____cacheline_aligned_in_smp;
310         wait_queue_head_t wait;
311 
312         struct rvt_ack_entry *s_ack_queue;
313         struct rvt_sge_state s_rdma_read_sge;
314 
315         spinlock_t r_lock ____cacheline_aligned_in_smp;      /* used for APM */
316         u32 r_psn;              /* expected rcv packet sequence number */
317         unsigned long r_aflags;
318         u64 r_wr_id;            /* ID for current receive WQE */
319         u32 r_ack_psn;          /* PSN for next ACK or atomic ACK */
320         u32 r_len;              /* total length of r_sge */
321         u32 r_rcv_len;          /* receive data len processed */
322         u32 r_msn;              /* message sequence number */
323 
324         u8 r_state;             /* opcode of last packet received */
325         u8 r_flags;
326         u8 r_head_ack_queue;    /* index into s_ack_queue[] */
327 
328         struct list_head rspwait;       /* link for waiting to respond */
329 
330         struct rvt_sge_state r_sge;     /* current receive data */
331         struct rvt_rq r_rq;             /* receive work queue */
332 
333         /* post send line */
334         spinlock_t s_hlock ____cacheline_aligned_in_smp;
335         u32 s_head;             /* new entries added here */
336         u32 s_next_psn;         /* PSN for next request */
337         u32 s_avail;            /* number of entries avail */
338         u32 s_ssn;              /* SSN of tail entry */
339         atomic_t s_reserved_used; /* reserved entries in use */
340 
341         spinlock_t s_lock ____cacheline_aligned_in_smp;
342         u32 s_flags;
343         struct rvt_sge_state *s_cur_sge;
344         struct rvt_swqe *s_wqe;
345         struct rvt_sge_state s_sge;     /* current send request data */
346         struct rvt_mregion *s_rdma_mr;
347         u32 s_cur_size;         /* size of send packet in bytes */
348         u32 s_len;              /* total length of s_sge */
349         u32 s_rdma_read_len;    /* total length of s_rdma_read_sge */
350         u32 s_last_psn;         /* last response PSN processed */
351         u32 s_sending_psn;      /* lowest PSN that is being sent */
352         u32 s_sending_hpsn;     /* highest PSN that is being sent */
353         u32 s_psn;              /* current packet sequence number */
354         u32 s_ack_rdma_psn;     /* PSN for sending RDMA read responses */
355         u32 s_ack_psn;          /* PSN for acking sends and RDMA writes */
356         u32 s_tail;             /* next entry to process */
357         u32 s_cur;              /* current work queue entry */
358         u32 s_acked;            /* last un-ACK'ed entry */
359         u32 s_last;             /* last completed entry */
360         u32 s_lsn;              /* limit sequence number (credit) */
361         u16 s_hdrwords;         /* size of s_hdr in 32 bit words */
362         u16 s_rdma_ack_cnt;
363         s8 s_ahgidx;
364         u8 s_state;             /* opcode of last packet sent */
365         u8 s_ack_state;         /* opcode of packet to ACK */
366         u8 s_nak_state;         /* non-zero if NAK is pending */
367         u8 r_nak_state;         /* non-zero if NAK is pending */
368         u8 s_retry;             /* requester retry counter */
369         u8 s_rnr_retry;         /* requester RNR retry counter */
370         u8 s_num_rd_atomic;     /* number of RDMA read/atomic pending */
371         u8 s_tail_ack_queue;    /* index into s_ack_queue[] */
372 
373         struct rvt_sge_state s_ack_rdma_sge;
374         struct timer_list s_timer;
375         struct hrtimer s_rnr_timer;
376 
377         atomic_t local_ops_pending; /* number of fast_reg/local_inv reqs */
378 
379         /*
380          * This sge list MUST be last. Do not add anything below here.
381          */
382         struct rvt_sge r_sg_list[0] /* verified SGEs */
383                 ____cacheline_aligned_in_smp;
384 };
385 
386 struct rvt_srq {
387         struct ib_srq ibsrq;
388         struct rvt_rq rq;
389         struct rvt_mmap_info *ip;
390         /* send signal when number of RWQEs < limit */
391         u32 limit;
392 };
393 
394 #define RVT_QPN_MAX                 BIT(24)
395 #define RVT_QPNMAP_ENTRIES          (RVT_QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
396 #define RVT_BITS_PER_PAGE           (PAGE_SIZE * BITS_PER_BYTE)
397 #define RVT_BITS_PER_PAGE_MASK      (RVT_BITS_PER_PAGE - 1)
398 #define RVT_QPN_MASK                0xFFFFFF
399 
400 /*
401  * QPN-map pages start out as NULL, they get allocated upon
402  * first use and are never deallocated. This way,
403  * large bitmaps are not allocated unless large numbers of QPs are used.
404  */
405 struct rvt_qpn_map {
406         void *page;
407 };
408 
409 struct rvt_qpn_table {
410         spinlock_t lock; /* protect changes to the qp table */
411         unsigned flags;         /* flags for QP0/1 allocated for each port */
412         u32 last;               /* last QP number allocated */
413         u32 nmaps;              /* size of the map table */
414         u16 limit;
415         u8  incr;
416         /* bit map of free QP numbers other than 0/1 */
417         struct rvt_qpn_map map[RVT_QPNMAP_ENTRIES];
418 };
419 
420 struct rvt_qp_ibdev {
421         u32 qp_table_size;
422         u32 qp_table_bits;
423         struct rvt_qp __rcu **qp_table;
424         spinlock_t qpt_lock; /* qptable lock */
425         struct rvt_qpn_table qpn_table;
426 };
427 
428 /*
429  * There is one struct rvt_mcast for each multicast GID.
430  * All attached QPs are then stored as a list of
431  * struct rvt_mcast_qp.
432  */
433 struct rvt_mcast_qp {
434         struct list_head list;
435         struct rvt_qp *qp;
436 };
437 
438 struct rvt_mcast {
439         struct rb_node rb_node;
440         union ib_gid mgid;
441         struct list_head qp_list;
442         wait_queue_head_t wait;
443         atomic_t refcount;
444         int n_attached;
445 };
446 
447 /*
448  * Since struct rvt_swqe is not a fixed size, we can't simply index into
449  * struct rvt_qp.s_wq.  This function does the array index computation.
450  */
451 static inline struct rvt_swqe *rvt_get_swqe_ptr(struct rvt_qp *qp,
452                                                 unsigned n)
453 {
454         return (struct rvt_swqe *)((char *)qp->s_wq +
455                                      (sizeof(struct rvt_swqe) +
456                                       qp->s_max_sge *
457                                       sizeof(struct rvt_sge)) * n);
458 }
459 
460 /*
461  * Since struct rvt_rwqe is not a fixed size, we can't simply index into
462  * struct rvt_rwq.wq.  This function does the array index computation.
463  */
464 static inline struct rvt_rwqe *rvt_get_rwqe_ptr(struct rvt_rq *rq, unsigned n)
465 {
466         return (struct rvt_rwqe *)
467                 ((char *)rq->wq->wq +
468                  (sizeof(struct rvt_rwqe) +
469                   rq->max_sge * sizeof(struct ib_sge)) * n);
470 }
471 
472 /**
473  * rvt_is_user_qp - return if this is user mode QP
474  * @qp - the target QP
475  */
476 static inline bool rvt_is_user_qp(struct rvt_qp *qp)
477 {
478         return !!qp->pid;
479 }
480 
481 /**
482  * rvt_get_qp - get a QP reference
483  * @qp - the QP to hold
484  */
485 static inline void rvt_get_qp(struct rvt_qp *qp)
486 {
487         atomic_inc(&qp->refcount);
488 }
489 
490 /**
491  * rvt_put_qp - release a QP reference
492  * @qp - the QP to release
493  */
494 static inline void rvt_put_qp(struct rvt_qp *qp)
495 {
496         if (qp && atomic_dec_and_test(&qp->refcount))
497                 wake_up(&qp->wait);
498 }
499 
500 /**
501  * rvt_put_swqe - drop mr refs held by swqe
502  * @wqe - the send wqe
503  *
504  * This drops any mr references held by the swqe
505  */
506 static inline void rvt_put_swqe(struct rvt_swqe *wqe)
507 {
508         int i;
509 
510         for (i = 0; i < wqe->wr.num_sge; i++) {
511                 struct rvt_sge *sge = &wqe->sg_list[i];
512 
513                 rvt_put_mr(sge->mr);
514         }
515 }
516 
517 /**
518  * rvt_qp_wqe_reserve - reserve operation
519  * @qp - the rvt qp
520  * @wqe - the send wqe
521  *
522  * This routine used in post send to record
523  * a wqe relative reserved operation use.
524  */
525 static inline void rvt_qp_wqe_reserve(
526         struct rvt_qp *qp,
527         struct rvt_swqe *wqe)
528 {
529         wqe->wr.send_flags |= RVT_SEND_RESERVE_USED;
530         atomic_inc(&qp->s_reserved_used);
531 }
532 
533 /**
534  * rvt_qp_wqe_unreserve - clean reserved operation
535  * @qp - the rvt qp
536  * @wqe - the send wqe
537  *
538  * This decrements the reserve use count.
539  *
540  * This call MUST precede the change to
541  * s_last to insure that post send sees a stable
542  * s_avail.
543  *
544  * An smp_mp__after_atomic() is used to insure
545  * the compiler does not juggle the order of the s_last
546  * ring index and the decrementing of s_reserved_used.
547  */
548 static inline void rvt_qp_wqe_unreserve(
549         struct rvt_qp *qp,
550         struct rvt_swqe *wqe)
551 {
552         if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED)) {
553                 wqe->wr.send_flags &= ~RVT_SEND_RESERVE_USED;
554                 atomic_dec(&qp->s_reserved_used);
555                 /* insure no compiler re-order up to s_last change */
556                 smp_mb__after_atomic();
557         }
558 }
559 
560 extern const enum ib_wc_opcode ib_rvt_wc_opcode[];
561 
562 /**
563  * rvt_qp_swqe_complete() - insert send completion
564  * @qp - the qp
565  * @wqe - the send wqe
566  * @status - completion status
567  *
568  * Insert a send completion into the completion
569  * queue if the qp indicates it should be done.
570  *
571  * See IBTA 10.7.3.1 for info on completion
572  * control.
573  */
574 static inline void rvt_qp_swqe_complete(
575         struct rvt_qp *qp,
576         struct rvt_swqe *wqe,
577         enum ib_wc_status status)
578 {
579         if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED))
580                 return;
581         if (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) ||
582             (wqe->wr.send_flags & IB_SEND_SIGNALED) ||
583              status != IB_WC_SUCCESS) {
584                 struct ib_wc wc;
585 
586                 memset(&wc, 0, sizeof(wc));
587                 wc.wr_id = wqe->wr.wr_id;
588                 wc.status = status;
589                 wc.opcode = ib_rvt_wc_opcode[wqe->wr.opcode];
590                 wc.qp = &qp->ibqp;
591                 wc.byte_len = wqe->length;
592                 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.send_cq), &wc,
593                              status != IB_WC_SUCCESS);
594         }
595 }
596 
597 /*
598  * Compare the lower 24 bits of the msn values.
599  * Returns an integer <, ==, or > than zero.
600  */
601 static inline int rvt_cmp_msn(u32 a, u32 b)
602 {
603         return (((int)a) - ((int)b)) << 8;
604 }
605 
606 /**
607  * rvt_compute_aeth - compute the AETH (syndrome + MSN)
608  * @qp: the queue pair to compute the AETH for
609  *
610  * Returns the AETH.
611  */
612 __be32 rvt_compute_aeth(struct rvt_qp *qp);
613 
614 /**
615  * rvt_get_credit - flush the send work queue of a QP
616  * @qp: the qp who's send work queue to flush
617  * @aeth: the Acknowledge Extended Transport Header
618  *
619  * The QP s_lock should be held.
620  */
621 void rvt_get_credit(struct rvt_qp *qp, u32 aeth);
622 
623 /**
624  * @qp - the qp pair
625  * @len - the length
626  *
627  * Perform a shift based mtu round up divide
628  */
629 static inline u32 rvt_div_round_up_mtu(struct rvt_qp *qp, u32 len)
630 {
631         return (len + qp->pmtu - 1) >> qp->log_pmtu;
632 }
633 
634 /**
635  * @qp - the qp pair
636  * @len - the length
637  *
638  * Perform a shift based mtu divide
639  */
640 static inline u32 rvt_div_mtu(struct rvt_qp *qp, u32 len)
641 {
642         return len >> qp->log_pmtu;
643 }
644 
645 extern const int  ib_rvt_state_ops[];
646 
647 struct rvt_dev_info;
648 void rvt_comm_est(struct rvt_qp *qp);
649 int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
650 void rvt_rc_error(struct rvt_qp *qp, enum ib_wc_status err);
651 unsigned long rvt_rnr_tbl_to_usec(u32 index);
652 enum hrtimer_restart rvt_rc_rnr_retry(struct hrtimer *t);
653 void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth);
654 void rvt_del_timers_sync(struct rvt_qp *qp);
655 void rvt_stop_rc_timers(struct rvt_qp *qp);
656 void rvt_add_retry_timer(struct rvt_qp *qp);
657 
658 #endif          /* DEF_RDMAVT_INCQP_H */
659 

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