1 #ifndef DEF_RDMAVT_INCQP_H
2 #define DEF_RDMAVT_INCQP_H
5 * Copyright(c) 2016 - 2018 Intel Corporation.
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51 #include <rdma/rdma_vt.h>
52 #include <rdma/ib_pack.h>
53 #include <rdma/ib_verbs.h>
54 #include <rdma/rdmavt_cq.h>
56 * Atomic bit definitions for r_aflags.
58 #define RVT_R_WRID_VALID 0
59 #define RVT_R_REWIND_SGE 1
62 * Bit definitions for r_flags.
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
71 * Bit definitions for s_flags.
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 * RVT_S_MAX_BIT_MASK - The max bit that can be used by rdmavt
96 #define RVT_S_SIGNAL_REQ_WR 0x0001
97 #define RVT_S_BUSY 0x0002
98 #define RVT_S_TIMER 0x0004
99 #define RVT_S_RESP_PENDING 0x0008
100 #define RVT_S_ACK_PENDING 0x0010
101 #define RVT_S_WAIT_FENCE 0x0020
102 #define RVT_S_WAIT_RDMAR 0x0040
103 #define RVT_S_WAIT_RNR 0x0080
104 #define RVT_S_WAIT_SSN_CREDIT 0x0100
105 #define RVT_S_WAIT_DMA 0x0200
106 #define RVT_S_WAIT_PIO 0x0400
107 #define RVT_S_WAIT_TX 0x0800
108 #define RVT_S_WAIT_DMA_DESC 0x1000
109 #define RVT_S_WAIT_KMEM 0x2000
110 #define RVT_S_WAIT_PSN 0x4000
111 #define RVT_S_WAIT_ACK 0x8000
112 #define RVT_S_SEND_ONE 0x10000
113 #define RVT_S_UNLIMITED_CREDIT 0x20000
114 #define RVT_S_ECN 0x40000
115 #define RVT_S_MAX_BIT_MASK 0x800000
118 * Drivers should use s_flags starting with bit 31 down to the bit next to
123 * Wait flags that would prevent any packet type from being sent.
125 #define RVT_S_ANY_WAIT_IO \
126 (RVT_S_WAIT_PIO | RVT_S_WAIT_TX | \
127 RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM)
130 * Wait flags that would prevent send work requests from making progress.
132 #define RVT_S_ANY_WAIT_SEND (RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | \
133 RVT_S_WAIT_RNR | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_DMA | \
134 RVT_S_WAIT_PSN | RVT_S_WAIT_ACK)
136 #define RVT_S_ANY_WAIT (RVT_S_ANY_WAIT_IO | RVT_S_ANY_WAIT_SEND)
138 /* Number of bits to pay attention to in the opcode for checking qp type */
139 #define RVT_OPCODE_QP_MASK 0xE0
141 /* Flags for checking QP state (see ib_rvt_state_ops[]) */
142 #define RVT_POST_SEND_OK 0x01
143 #define RVT_POST_RECV_OK 0x02
144 #define RVT_PROCESS_RECV_OK 0x04
145 #define RVT_PROCESS_SEND_OK 0x08
146 #define RVT_PROCESS_NEXT_SEND_OK 0x10
147 #define RVT_FLUSH_SEND 0x20
148 #define RVT_FLUSH_RECV 0x40
149 #define RVT_PROCESS_OR_FLUSH_SEND \
150 (RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND)
151 #define RVT_SEND_OR_FLUSH_OR_RECV_OK \
152 (RVT_PROCESS_SEND_OK | RVT_FLUSH_SEND | RVT_PROCESS_RECV_OK)
155 * Internal send flags
157 #define RVT_SEND_RESERVE_USED IB_SEND_RESERVED_START
158 #define RVT_SEND_COMPLETION_ONLY (IB_SEND_RESERVED_START << 1)
161 * Send work request queue entry.
162 * The size of the sg_list is determined when the QP is created and stored
167 struct ib_send_wr wr; /* don't use wr.sg_list */
168 struct ib_ud_wr ud_wr;
169 struct ib_reg_wr reg_wr;
170 struct ib_rdma_wr rdma_wr;
171 struct ib_atomic_wr atomic_wr;
173 u32 psn; /* first packet sequence number */
174 u32 lpsn; /* last packet sequence number */
175 u32 ssn; /* send sequence number */
176 u32 length; /* total length of data in sg_list */
177 void *priv; /* driver dependent field */
178 struct rvt_sge sg_list[0];
182 * Receive work request queue entry.
183 * The size of the sg_list is determined when the QP (or SRQ) is created
184 * and stored in qp->r_rq.max_sge (or srq->rq.max_sge).
189 struct ib_sge sg_list[0];
193 * This structure is used to contain the head pointer, tail pointer,
194 * and receive work queue entries as a single memory allocation so
195 * it can be mmap'ed into user space.
196 * Note that the wq array elements are variable size so you can't
197 * just index into the array to get the N'th element;
198 * use get_rwqe_ptr() instead.
201 u32 head; /* new work requests posted to the head */
202 u32 tail; /* receives pull requests from here. */
203 struct rvt_rwqe wq[0];
208 u32 size; /* size of RWQE array */
210 /* protect changes in this struct */
211 spinlock_t lock ____cacheline_aligned_in_smp;
215 * This structure is used by rvt_mmap() to validate an offset
216 * when an mmap() request is made. The vm_area_struct then uses
217 * this as its vm_private_data.
219 struct rvt_mmap_info {
220 struct list_head pending_mmaps;
221 struct ib_ucontext *context;
229 * This structure holds the information that the send tasklet needs
230 * to send a RDMA read response or atomic operation.
232 struct rvt_ack_entry {
233 struct rvt_sge rdma_sge;
242 #define RC_QP_SCALING_INTERVAL 5
244 #define RVT_OPERATION_PRIV 0x00000001
245 #define RVT_OPERATION_ATOMIC 0x00000002
246 #define RVT_OPERATION_ATOMIC_SGE 0x00000004
247 #define RVT_OPERATION_LOCAL 0x00000008
248 #define RVT_OPERATION_USE_RESERVE 0x00000010
249 #define RVT_OPERATION_IGN_RNR_CNT 0x00000020
251 #define RVT_OPERATION_MAX (IB_WR_RESERVED10 + 1)
254 * rvt_operation_params - op table entry
255 * @length - the length to copy into the swqe entry
256 * @qpt_support - a bit mask indicating QP type support
257 * @flags - RVT_OPERATION flags (see above)
259 * This supports table driven post send so that
260 * the driver can have differing an potentially
261 * different sets of operations.
265 struct rvt_operation_params {
272 * Common variables are protected by both r_rq.lock and s_lock in that order
273 * which only happens in modify_qp() or changing the QP 'state'.
277 void *priv; /* Driver private data */
278 /* read mostly fields above and below */
279 struct rdma_ah_attr remote_ah_attr;
280 struct rdma_ah_attr alt_ah_attr;
281 struct rvt_qp __rcu *next; /* link list for QPN hash table */
282 struct rvt_swqe *s_wq; /* send work queue */
283 struct rvt_mmap_info *ip;
285 unsigned long timeout_jiffies; /* computed from timeout */
287 int srate_mbps; /* s_srate (below) converted to Mbit/s */
288 pid_t pid; /* pid for user mode QPs */
290 u32 qkey; /* QKEY for this QP (for UD or RD) */
291 u32 s_size; /* send work queue size */
293 u16 pmtu; /* decoded from path_mtu */
294 u8 log_pmtu; /* shift for pmtu */
295 u8 state; /* QP state */
296 u8 allowed_ops; /* high order bits of allowed opcodes */
298 u8 alt_timeout; /* Alternate path timeout for this QP */
299 u8 timeout; /* Timeout for this QP */
303 u8 s_pkey_index; /* PKEY index to use */
304 u8 s_alt_pkey_index; /* Alternate path PKEY index to use */
305 u8 r_max_rd_atomic; /* max number of RDMA read/atomic to receive */
306 u8 s_max_rd_atomic; /* max number of RDMA read/atomic to send */
307 u8 s_retry_cnt; /* number of times to retry */
309 u8 r_min_rnr_timer; /* retry timeout value for RNR NAKs */
310 u8 s_max_sge; /* size of s_wq->sg_list */
313 /* start of read/write fields */
314 atomic_t refcount ____cacheline_aligned_in_smp;
315 wait_queue_head_t wait;
317 struct rvt_ack_entry *s_ack_queue;
318 struct rvt_sge_state s_rdma_read_sge;
320 spinlock_t r_lock ____cacheline_aligned_in_smp; /* used for APM */
321 u32 r_psn; /* expected rcv packet sequence number */
322 unsigned long r_aflags;
323 u64 r_wr_id; /* ID for current receive WQE */
324 u32 r_ack_psn; /* PSN for next ACK or atomic ACK */
325 u32 r_len; /* total length of r_sge */
326 u32 r_rcv_len; /* receive data len processed */
327 u32 r_msn; /* message sequence number */
329 u8 r_state; /* opcode of last packet received */
331 u8 r_head_ack_queue; /* index into s_ack_queue[] */
332 u8 r_adefered; /* defered ack count */
334 struct list_head rspwait; /* link for waiting to respond */
336 struct rvt_sge_state r_sge; /* current receive data */
337 struct rvt_rq r_rq; /* receive work queue */
340 spinlock_t s_hlock ____cacheline_aligned_in_smp;
341 u32 s_head; /* new entries added here */
342 u32 s_next_psn; /* PSN for next request */
343 u32 s_avail; /* number of entries avail */
344 u32 s_ssn; /* SSN of tail entry */
345 atomic_t s_reserved_used; /* reserved entries in use */
347 spinlock_t s_lock ____cacheline_aligned_in_smp;
349 struct rvt_sge_state *s_cur_sge;
350 struct rvt_swqe *s_wqe;
351 struct rvt_sge_state s_sge; /* current send request data */
352 struct rvt_mregion *s_rdma_mr;
353 u32 s_len; /* total length of s_sge */
354 u32 s_rdma_read_len; /* total length of s_rdma_read_sge */
355 u32 s_last_psn; /* last response PSN processed */
356 u32 s_sending_psn; /* lowest PSN that is being sent */
357 u32 s_sending_hpsn; /* highest PSN that is being sent */
358 u32 s_psn; /* current packet sequence number */
359 u32 s_ack_rdma_psn; /* PSN for sending RDMA read responses */
360 u32 s_ack_psn; /* PSN for acking sends and RDMA writes */
361 u32 s_tail; /* next entry to process */
362 u32 s_cur; /* current work queue entry */
363 u32 s_acked; /* last un-ACK'ed entry */
364 u32 s_last; /* last completed entry */
365 u32 s_lsn; /* limit sequence number (credit) */
366 u32 s_ahgpsn; /* set to the psn in the copy of the header */
367 u16 s_cur_size; /* size of send packet in bytes */
369 u8 s_hdrwords; /* size of s_hdr in 32 bit words */
371 u8 s_state; /* opcode of last packet sent */
372 u8 s_ack_state; /* opcode of packet to ACK */
373 u8 s_nak_state; /* non-zero if NAK is pending */
374 u8 r_nak_state; /* non-zero if NAK is pending */
375 u8 s_retry; /* requester retry counter */
376 u8 s_rnr_retry; /* requester RNR retry counter */
377 u8 s_num_rd_atomic; /* number of RDMA read/atomic pending */
378 u8 s_tail_ack_queue; /* index into s_ack_queue[] */
379 u8 s_acked_ack_queue; /* index into s_ack_queue[] */
381 struct rvt_sge_state s_ack_rdma_sge;
382 struct timer_list s_timer;
383 struct hrtimer s_rnr_timer;
385 atomic_t local_ops_pending; /* number of fast_reg/local_inv reqs */
388 * This sge list MUST be last. Do not add anything below here.
390 struct rvt_sge r_sg_list[0] /* verified SGEs */
391 ____cacheline_aligned_in_smp;
397 struct rvt_mmap_info *ip;
398 /* send signal when number of RWQEs < limit */
402 #define RVT_QPN_MAX BIT(24)
403 #define RVT_QPNMAP_ENTRIES (RVT_QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
404 #define RVT_BITS_PER_PAGE (PAGE_SIZE * BITS_PER_BYTE)
405 #define RVT_BITS_PER_PAGE_MASK (RVT_BITS_PER_PAGE - 1)
406 #define RVT_QPN_MASK IB_QPN_MASK
409 * QPN-map pages start out as NULL, they get allocated upon
410 * first use and are never deallocated. This way,
411 * large bitmaps are not allocated unless large numbers of QPs are used.
417 struct rvt_qpn_table {
418 spinlock_t lock; /* protect changes to the qp table */
419 unsigned flags; /* flags for QP0/1 allocated for each port */
420 u32 last; /* last QP number allocated */
421 u32 nmaps; /* size of the map table */
424 /* bit map of free QP numbers other than 0/1 */
425 struct rvt_qpn_map map[RVT_QPNMAP_ENTRIES];
428 struct rvt_qp_ibdev {
431 struct rvt_qp __rcu **qp_table;
432 spinlock_t qpt_lock; /* qptable lock */
433 struct rvt_qpn_table qpn_table;
437 * There is one struct rvt_mcast for each multicast GID.
438 * All attached QPs are then stored as a list of
439 * struct rvt_mcast_qp.
441 struct rvt_mcast_qp {
442 struct list_head list;
446 struct rvt_mcast_addr {
452 struct rb_node rb_node;
453 struct rvt_mcast_addr mcast_addr;
454 struct list_head qp_list;
455 wait_queue_head_t wait;
461 * Since struct rvt_swqe is not a fixed size, we can't simply index into
462 * struct rvt_qp.s_wq. This function does the array index computation.
464 static inline struct rvt_swqe *rvt_get_swqe_ptr(struct rvt_qp *qp,
467 return (struct rvt_swqe *)((char *)qp->s_wq +
468 (sizeof(struct rvt_swqe) +
470 sizeof(struct rvt_sge)) * n);
474 * Since struct rvt_rwqe is not a fixed size, we can't simply index into
475 * struct rvt_rwq.wq. This function does the array index computation.
477 static inline struct rvt_rwqe *rvt_get_rwqe_ptr(struct rvt_rq *rq, unsigned n)
479 return (struct rvt_rwqe *)
480 ((char *)rq->wq->wq +
481 (sizeof(struct rvt_rwqe) +
482 rq->max_sge * sizeof(struct ib_sge)) * n);
486 * rvt_is_user_qp - return if this is user mode QP
487 * @qp - the target QP
489 static inline bool rvt_is_user_qp(struct rvt_qp *qp)
495 * rvt_get_qp - get a QP reference
496 * @qp - the QP to hold
498 static inline void rvt_get_qp(struct rvt_qp *qp)
500 atomic_inc(&qp->refcount);
504 * rvt_put_qp - release a QP reference
505 * @qp - the QP to release
507 static inline void rvt_put_qp(struct rvt_qp *qp)
509 if (qp && atomic_dec_and_test(&qp->refcount))
514 * rvt_put_swqe - drop mr refs held by swqe
515 * @wqe - the send wqe
517 * This drops any mr references held by the swqe
519 static inline void rvt_put_swqe(struct rvt_swqe *wqe)
523 for (i = 0; i < wqe->wr.num_sge; i++) {
524 struct rvt_sge *sge = &wqe->sg_list[i];
531 * rvt_qp_wqe_reserve - reserve operation
533 * @wqe - the send wqe
535 * This routine used in post send to record
536 * a wqe relative reserved operation use.
538 static inline void rvt_qp_wqe_reserve(
540 struct rvt_swqe *wqe)
542 atomic_inc(&qp->s_reserved_used);
546 * rvt_qp_wqe_unreserve - clean reserved operation
548 * @wqe - the send wqe
550 * This decrements the reserve use count.
552 * This call MUST precede the change to
553 * s_last to insure that post send sees a stable
556 * An smp_mp__after_atomic() is used to insure
557 * the compiler does not juggle the order of the s_last
558 * ring index and the decrementing of s_reserved_used.
560 static inline void rvt_qp_wqe_unreserve(
562 struct rvt_swqe *wqe)
564 if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED)) {
565 atomic_dec(&qp->s_reserved_used);
566 /* insure no compiler re-order up to s_last change */
567 smp_mb__after_atomic();
571 extern const enum ib_wc_opcode ib_rvt_wc_opcode[];
574 * rvt_qp_swqe_complete() - insert send completion
576 * @wqe - the send wqe
577 * @status - completion status
579 * Insert a send completion into the completion
580 * queue if the qp indicates it should be done.
582 * See IBTA 10.7.3.1 for info on completion
585 static inline void rvt_qp_swqe_complete(
587 struct rvt_swqe *wqe,
588 enum ib_wc_opcode opcode,
589 enum ib_wc_status status)
591 if (unlikely(wqe->wr.send_flags & RVT_SEND_RESERVE_USED))
593 if (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) ||
594 (wqe->wr.send_flags & IB_SEND_SIGNALED) ||
595 status != IB_WC_SUCCESS) {
598 memset(&wc, 0, sizeof(wc));
599 wc.wr_id = wqe->wr.wr_id;
603 wc.byte_len = wqe->length;
604 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.send_cq), &wc,
605 status != IB_WC_SUCCESS);
610 * Compare the lower 24 bits of the msn values.
611 * Returns an integer <, ==, or > than zero.
613 static inline int rvt_cmp_msn(u32 a, u32 b)
615 return (((int)a) - ((int)b)) << 8;
619 * rvt_compute_aeth - compute the AETH (syndrome + MSN)
620 * @qp: the queue pair to compute the AETH for
624 __be32 rvt_compute_aeth(struct rvt_qp *qp);
627 * rvt_get_credit - flush the send work queue of a QP
628 * @qp: the qp who's send work queue to flush
629 * @aeth: the Acknowledge Extended Transport Header
631 * The QP s_lock should be held.
633 void rvt_get_credit(struct rvt_qp *qp, u32 aeth);
636 * rvt_restart_sge - rewind the sge state for a wqe
637 * @ss: the sge state pointer
638 * @wqe: the wqe to rewind
639 * @len: the data length from the start of the wqe in bytes
641 * Returns the remaining data length.
643 u32 rvt_restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, u32 len);
649 * Perform a shift based mtu round up divide
651 static inline u32 rvt_div_round_up_mtu(struct rvt_qp *qp, u32 len)
653 return (len + qp->pmtu - 1) >> qp->log_pmtu;
660 * Perform a shift based mtu divide
662 static inline u32 rvt_div_mtu(struct rvt_qp *qp, u32 len)
664 return len >> qp->log_pmtu;
668 * rvt_timeout_to_jiffies - Convert a ULP timeout input into jiffies
669 * @timeout - timeout input(0 - 31).
671 * Return a timeout value in jiffies.
673 static inline unsigned long rvt_timeout_to_jiffies(u8 timeout)
678 return usecs_to_jiffies(1U << timeout) * 4096UL / 1000UL;
681 extern const int ib_rvt_state_ops[];
684 int rvt_get_rwqe(struct rvt_qp *qp, bool wr_id_only);
685 void rvt_comm_est(struct rvt_qp *qp);
686 int rvt_error_qp(struct rvt_qp *qp, enum ib_wc_status err);
687 void rvt_rc_error(struct rvt_qp *qp, enum ib_wc_status err);
688 unsigned long rvt_rnr_tbl_to_usec(u32 index);
689 enum hrtimer_restart rvt_rc_rnr_retry(struct hrtimer *t);
690 void rvt_add_rnr_timer(struct rvt_qp *qp, u32 aeth);
691 void rvt_del_timers_sync(struct rvt_qp *qp);
692 void rvt_stop_rc_timers(struct rvt_qp *qp);
693 void rvt_add_retry_timer_ext(struct rvt_qp *qp, u8 shift);
694 static inline void rvt_add_retry_timer(struct rvt_qp *qp)
696 rvt_add_retry_timer_ext(qp, 0);
699 void rvt_copy_sge(struct rvt_qp *qp, struct rvt_sge_state *ss,
700 void *data, u32 length,
701 bool release, bool copy_last);
702 void rvt_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
703 enum ib_wc_status status);
704 void rvt_ruc_loopback(struct rvt_qp *qp);
707 * struct rvt_qp_iter - the iterator for QPs
708 * @qp - the current QP
710 * This structure defines the current iterator
711 * state for sequenced access to all QPs relative
712 * to an rvt_dev_info.
716 /* private: backpointer */
717 struct rvt_dev_info *rdi;
718 /* private: callback routine */
719 void (*cb)(struct rvt_qp *qp, u64 v);
720 /* private: for arg to callback routine */
722 /* private: number of SMI,GSI QPs for device */
724 /* private: current iterator index */
728 struct rvt_qp_iter *rvt_qp_iter_init(struct rvt_dev_info *rdi,
730 void (*cb)(struct rvt_qp *qp, u64 v));
731 int rvt_qp_iter_next(struct rvt_qp_iter *iter);
732 void rvt_qp_iter(struct rvt_dev_info *rdi,
734 void (*cb)(struct rvt_qp *qp, u64 v));
735 void rvt_qp_mr_clean(struct rvt_qp *qp, u32 lkey);
736 #endif /* DEF_RDMAVT_INCQP_H */