2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the BSD-type
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11 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions and the following disclaimer.
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20 * with the distribution.
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23 * its contributors may be used to endorse or promote products
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40 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H
41 #define _LINUX_SUNRPC_XPRT_RDMA_H
43 #include <linux/wait.h> /* wait_queue_head_t, etc */
44 #include <linux/spinlock.h> /* spinlock_t, etc */
45 #include <linux/atomic.h> /* atomic_t, etc */
46 #include <linux/workqueue.h> /* struct work_struct */
48 #include <rdma/rdma_cm.h> /* RDMA connection api */
49 #include <rdma/ib_verbs.h> /* RDMA verbs api */
51 #include <linux/sunrpc/clnt.h> /* rpc_xprt */
52 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */
53 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */
55 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */
56 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */
58 #define RPCRDMA_BIND_TO (60U * HZ)
59 #define RPCRDMA_INIT_REEST_TO (5U * HZ)
60 #define RPCRDMA_MAX_REEST_TO (30U * HZ)
61 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
64 * Interface Adapter -- one per transport instance
67 const struct rpcrdma_memreg_ops
*ri_ops
;
68 struct ib_device
*ri_device
;
69 struct rdma_cm_id
*ri_id
;
71 struct completion ri_done
;
72 struct completion ri_remove_done
;
74 unsigned int ri_max_segs
;
75 unsigned int ri_max_frmr_depth
;
76 unsigned int ri_max_inline_write
;
77 unsigned int ri_max_inline_read
;
78 unsigned int ri_max_send_sges
;
79 bool ri_reminv_expected
;
80 bool ri_implicit_roundup
;
81 enum ib_mr_type ri_mrtype
;
82 unsigned long ri_flags
;
83 struct ib_qp_attr ri_qp_attr
;
84 struct ib_qp_init_attr ri_qp_init_attr
;
88 RPCRDMA_IAF_REMOVING
= 0,
92 * RDMA Endpoint -- one per transport instance
99 struct ib_qp_init_attr rep_attr
;
100 wait_queue_head_t rep_connect_wait
;
101 struct rpcrdma_connect_private rep_cm_private
;
102 struct rdma_conn_param rep_remote_cma
;
103 struct sockaddr_storage rep_remote_addr
;
104 struct delayed_work rep_connect_worker
;
108 rpcrdma_init_cqcount(struct rpcrdma_ep
*ep
, int count
)
110 atomic_set(&ep
->rep_cqcount
, ep
->rep_cqinit
- count
);
113 /* To update send queue accounting, provider must take a
114 * send completion every now and then.
117 rpcrdma_set_signaled(struct rpcrdma_ep
*ep
, struct ib_send_wr
*send_wr
)
119 send_wr
->send_flags
= 0;
120 if (unlikely(atomic_sub_return(1, &ep
->rep_cqcount
) <= 0)) {
121 rpcrdma_init_cqcount(ep
, 0);
122 send_wr
->send_flags
= IB_SEND_SIGNALED
;
126 /* Pre-allocate extra Work Requests for handling backward receives
127 * and sends. This is a fixed value because the Work Queues are
128 * allocated when the forward channel is set up.
130 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
131 #define RPCRDMA_BACKWARD_WRS (8)
133 #define RPCRDMA_BACKWARD_WRS (0)
136 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
138 * The below structure appears at the front of a large region of kmalloc'd
139 * memory, which always starts on a good alignment boundary.
142 struct rpcrdma_regbuf
{
143 struct ib_sge rg_iov
;
144 struct ib_device
*rg_device
;
145 enum dma_data_direction rg_direction
;
146 __be32 rg_base
[0] __attribute__ ((aligned(256)));
150 rdmab_addr(struct rpcrdma_regbuf
*rb
)
152 return rb
->rg_iov
.addr
;
156 rdmab_length(struct rpcrdma_regbuf
*rb
)
158 return rb
->rg_iov
.length
;
162 rdmab_lkey(struct rpcrdma_regbuf
*rb
)
164 return rb
->rg_iov
.lkey
;
167 static inline struct rpcrdma_msg
*
168 rdmab_to_msg(struct rpcrdma_regbuf
*rb
)
170 return (struct rpcrdma_msg
*)rb
->rg_base
;
173 static inline struct ib_device
*
174 rdmab_device(struct rpcrdma_regbuf
*rb
)
176 return rb
->rg_device
;
179 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN)
181 /* To ensure a transport can always make forward progress,
182 * the number of RDMA segments allowed in header chunk lists
183 * is capped at 8. This prevents less-capable devices and
184 * memory registrations from overrunning the Send buffer
185 * while building chunk lists.
187 * Elements of the Read list take up more room than the
188 * Write list or Reply chunk. 8 read segments means the Read
189 * list (or Write list or Reply chunk) cannot consume more
192 * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes.
194 * And the fixed part of the header is another 24 bytes.
196 * The smallest inline threshold is 1024 bytes, ensuring that
197 * at least 750 bytes are available for RPC messages.
200 RPCRDMA_MAX_HDR_SEGS
= 8,
201 RPCRDMA_HDRBUF_SIZE
= 256,
205 * struct rpcrdma_rep -- this structure encapsulates state required to recv
206 * and complete a reply, asychronously. It needs several pieces of
208 * o recv buffer (posted to provider)
209 * o ib_sge (also donated to provider)
210 * o status of reply (length, success or not)
211 * o bookkeeping state to get run by reply handler (list, etc)
213 * These are allocated during initialization, per-transport instance.
215 * N of these are associated with a transport instance, and stored in
216 * struct rpcrdma_buffer. N is the max number of outstanding requests.
220 struct ib_cqe rr_cqe
;
223 struct rpcrdma_regbuf
*rr_rdmabuf
;
224 struct rpcrdma_xprt
*rr_rxprt
;
225 struct work_struct rr_work
;
226 struct xdr_buf rr_hdrbuf
;
227 struct xdr_stream rr_stream
;
228 struct list_head rr_list
;
229 struct ib_recv_wr rr_recv_wr
;
233 * struct rpcrdma_mw - external memory region metadata
235 * An external memory region is any buffer or page that is registered
236 * on the fly (ie, not pre-registered).
238 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
239 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
240 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
241 * track of registration metadata while each RPC is pending.
242 * rpcrdma_deregister_external() uses this metadata to unmap and
243 * release these resources when an RPC is complete.
245 enum rpcrdma_frmr_state
{
246 FRMR_IS_INVALID
, /* ready to be used */
247 FRMR_IS_VALID
, /* in use */
248 FRMR_FLUSHED_FR
, /* flushed FASTREG WR */
249 FRMR_FLUSHED_LI
, /* flushed LOCALINV WR */
252 struct rpcrdma_frmr
{
254 struct ib_cqe fr_cqe
;
255 enum rpcrdma_frmr_state fr_state
;
256 struct completion fr_linv_done
;
258 struct ib_reg_wr fr_regwr
;
259 struct ib_send_wr fr_invwr
;
264 struct ib_fmr
*fm_mr
;
269 struct list_head mw_list
;
270 struct scatterlist
*mw_sg
;
272 enum dma_data_direction mw_dir
;
273 unsigned long mw_flags
;
275 struct rpcrdma_fmr fmr
;
276 struct rpcrdma_frmr frmr
;
278 struct rpcrdma_xprt
*mw_xprt
;
282 struct list_head mw_all
;
291 * struct rpcrdma_req -- structure central to the request/reply sequence.
293 * N of these are associated with a transport instance, and stored in
294 * struct rpcrdma_buffer. N is the max number of outstanding requests.
296 * It includes pre-registered buffer memory for send AND recv.
297 * The recv buffer, however, is not owned by this structure, and
298 * is "donated" to the hardware when a recv is posted. When a
299 * reply is handled, the recv buffer used is given back to the
300 * struct rpcrdma_req associated with the request.
302 * In addition to the basic memory, this structure includes an array
303 * of iovs for send operations. The reason is that the iovs passed to
304 * ib_post_{send,recv} must not be modified until the work request
308 /* Maximum number of page-sized "segments" per chunk list to be
309 * registered or invalidated. Must handle a Reply chunk:
312 RPCRDMA_MAX_IOV_SEGS
= 3,
313 RPCRDMA_MAX_DATA_SEGS
= ((1 * 1024 * 1024) / PAGE_SIZE
) + 1,
314 RPCRDMA_MAX_SEGS
= RPCRDMA_MAX_DATA_SEGS
+
315 RPCRDMA_MAX_IOV_SEGS
,
318 struct rpcrdma_mr_seg
{ /* chunk descriptors */
319 u32 mr_len
; /* length of chunk or segment */
320 struct page
*mr_page
; /* owning page, if any */
321 char *mr_offset
; /* kva if no page, else offset */
324 /* The Send SGE array is provisioned to send a maximum size
326 * - RPC-over-RDMA header
327 * - xdr_buf head iovec
328 * - RPCRDMA_MAX_INLINE bytes, in pages
329 * - xdr_buf tail iovec
331 * The actual number of array elements consumed by each RPC
332 * depends on the device's max_sge limit.
335 RPCRDMA_MIN_SEND_SGES
= 3,
336 RPCRDMA_MAX_PAGE_SGES
= RPCRDMA_MAX_INLINE
>> PAGE_SHIFT
,
337 RPCRDMA_MAX_SEND_SGES
= 1 + 1 + RPCRDMA_MAX_PAGE_SGES
+ 1,
340 struct rpcrdma_buffer
;
342 struct list_head rl_list
;
343 unsigned int rl_mapped_sges
;
344 unsigned int rl_connect_cookie
;
345 struct rpcrdma_buffer
*rl_buffer
;
346 struct rpcrdma_rep
*rl_reply
;
347 struct xdr_stream rl_stream
;
348 struct xdr_buf rl_hdrbuf
;
349 struct ib_send_wr rl_send_wr
;
350 struct ib_sge rl_send_sge
[RPCRDMA_MAX_SEND_SGES
];
351 struct rpcrdma_regbuf
*rl_rdmabuf
; /* xprt header */
352 struct rpcrdma_regbuf
*rl_sendbuf
; /* rq_snd_buf */
353 struct rpcrdma_regbuf
*rl_recvbuf
; /* rq_rcv_buf */
355 struct ib_cqe rl_cqe
;
356 struct list_head rl_all
;
359 struct list_head rl_registered
; /* registered segments */
360 struct rpcrdma_mr_seg rl_segments
[RPCRDMA_MAX_SEGS
];
364 rpcrdma_set_xprtdata(struct rpc_rqst
*rqst
, struct rpcrdma_req
*req
)
366 rqst
->rq_xprtdata
= req
;
369 static inline struct rpcrdma_req
*
370 rpcr_to_rdmar(struct rpc_rqst
*rqst
)
372 return rqst
->rq_xprtdata
;
376 rpcrdma_push_mw(struct rpcrdma_mw
*mw
, struct list_head
*list
)
378 list_add_tail(&mw
->mw_list
, list
);
381 static inline struct rpcrdma_mw
*
382 rpcrdma_pop_mw(struct list_head
*list
)
384 struct rpcrdma_mw
*mw
;
386 mw
= list_first_entry(list
, struct rpcrdma_mw
, mw_list
);
387 list_del(&mw
->mw_list
);
392 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
393 * inline requests/replies, and client/server credits.
395 * One of these is associated with a transport instance
397 struct rpcrdma_buffer
{
398 spinlock_t rb_mwlock
; /* protect rb_mws list */
399 struct list_head rb_mws
;
400 struct list_head rb_all
;
402 spinlock_t rb_lock
; /* protect buf lists */
403 int rb_send_count
, rb_recv_count
;
404 struct list_head rb_send_bufs
;
405 struct list_head rb_recv_bufs
;
407 atomic_t rb_credits
; /* most recent credit grant */
409 u32 rb_bc_srv_max_requests
;
410 spinlock_t rb_reqslock
; /* protect rb_allreqs */
411 struct list_head rb_allreqs
;
413 u32 rb_bc_max_requests
;
415 spinlock_t rb_recovery_lock
; /* protect rb_stale_mrs */
416 struct list_head rb_stale_mrs
;
417 struct delayed_work rb_recovery_worker
;
418 struct delayed_work rb_refresh_worker
;
420 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
423 * Internal structure for transport instance creation. This
424 * exists primarily for modularity.
426 * This data should be set with mount options
428 struct rpcrdma_create_data_internal
{
429 struct sockaddr_storage addr
; /* RDMA server address */
430 unsigned int max_requests
; /* max requests (slots) in flight */
431 unsigned int rsize
; /* mount rsize - max read hdr+data */
432 unsigned int wsize
; /* mount wsize - max write hdr+data */
433 unsigned int inline_rsize
; /* max non-rdma read data payload */
434 unsigned int inline_wsize
; /* max non-rdma write data payload */
435 unsigned int padding
; /* non-rdma write header padding */
439 * Statistics for RPCRDMA
441 struct rpcrdma_stats
{
442 /* accessed when sending a call */
443 unsigned long read_chunk_count
;
444 unsigned long write_chunk_count
;
445 unsigned long reply_chunk_count
;
446 unsigned long long total_rdma_request
;
448 /* rarely accessed error counters */
449 unsigned long long pullup_copy_count
;
450 unsigned long hardway_register_count
;
451 unsigned long failed_marshal_count
;
452 unsigned long bad_reply_count
;
453 unsigned long mrs_recovered
;
454 unsigned long mrs_orphaned
;
455 unsigned long mrs_allocated
;
457 /* accessed when receiving a reply */
458 unsigned long long total_rdma_reply
;
459 unsigned long long fixup_copy_count
;
460 unsigned long local_inv_needed
;
461 unsigned long nomsg_call_count
;
462 unsigned long bcall_count
;
466 * Per-registration mode operations
469 struct rpcrdma_memreg_ops
{
470 struct rpcrdma_mr_seg
*
471 (*ro_map
)(struct rpcrdma_xprt
*,
472 struct rpcrdma_mr_seg
*, int, bool,
473 struct rpcrdma_mw
**);
474 void (*ro_unmap_sync
)(struct rpcrdma_xprt
*,
476 void (*ro_unmap_safe
)(struct rpcrdma_xprt
*,
477 struct rpcrdma_req
*, bool);
478 void (*ro_recover_mr
)(struct rpcrdma_mw
*);
479 int (*ro_open
)(struct rpcrdma_ia
*,
481 struct rpcrdma_create_data_internal
*);
482 size_t (*ro_maxpages
)(struct rpcrdma_xprt
*);
483 int (*ro_init_mr
)(struct rpcrdma_ia
*,
484 struct rpcrdma_mw
*);
485 void (*ro_release_mr
)(struct rpcrdma_mw
*);
486 const char *ro_displayname
;
487 const int ro_send_w_inv_ok
;
490 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops
;
491 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops
;
494 * RPCRDMA transport -- encapsulates the structures above for
495 * integration with RPC.
497 * The contained structures are embedded, not pointers,
498 * for convenience. This structure need not be visible externally.
500 * It is allocated and initialized during mount, and released
503 struct rpcrdma_xprt
{
504 struct rpc_xprt rx_xprt
;
505 struct rpcrdma_ia rx_ia
;
506 struct rpcrdma_ep rx_ep
;
507 struct rpcrdma_buffer rx_buf
;
508 struct rpcrdma_create_data_internal rx_data
;
509 struct delayed_work rx_connect_worker
;
510 struct rpcrdma_stats rx_stats
;
513 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
514 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
516 /* Setting this to 0 ensures interoperability with early servers.
517 * Setting this to 1 enhances certain unaligned read/write performance.
518 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
519 extern int xprt_rdma_pad_optimize
;
521 /* This setting controls the hunt for a supported memory
522 * registration strategy.
524 extern unsigned int xprt_rdma_memreg_strategy
;
527 * Interface Adapter calls - xprtrdma/verbs.c
529 int rpcrdma_ia_open(struct rpcrdma_xprt
*xprt
, struct sockaddr
*addr
);
530 void rpcrdma_ia_remove(struct rpcrdma_ia
*ia
);
531 void rpcrdma_ia_close(struct rpcrdma_ia
*);
532 bool frwr_is_supported(struct rpcrdma_ia
*);
533 bool fmr_is_supported(struct rpcrdma_ia
*);
536 * Endpoint calls - xprtrdma/verbs.c
538 int rpcrdma_ep_create(struct rpcrdma_ep
*, struct rpcrdma_ia
*,
539 struct rpcrdma_create_data_internal
*);
540 void rpcrdma_ep_destroy(struct rpcrdma_ep
*, struct rpcrdma_ia
*);
541 int rpcrdma_ep_connect(struct rpcrdma_ep
*, struct rpcrdma_ia
*);
542 void rpcrdma_conn_func(struct rpcrdma_ep
*ep
);
543 void rpcrdma_ep_disconnect(struct rpcrdma_ep
*, struct rpcrdma_ia
*);
545 int rpcrdma_ep_post(struct rpcrdma_ia
*, struct rpcrdma_ep
*,
546 struct rpcrdma_req
*);
547 int rpcrdma_ep_post_recv(struct rpcrdma_ia
*, struct rpcrdma_rep
*);
550 * Buffer calls - xprtrdma/verbs.c
552 struct rpcrdma_req
*rpcrdma_create_req(struct rpcrdma_xprt
*);
553 void rpcrdma_destroy_req(struct rpcrdma_req
*);
554 int rpcrdma_create_rep(struct rpcrdma_xprt
*r_xprt
);
555 int rpcrdma_buffer_create(struct rpcrdma_xprt
*);
556 void rpcrdma_buffer_destroy(struct rpcrdma_buffer
*);
558 struct rpcrdma_mw
*rpcrdma_get_mw(struct rpcrdma_xprt
*);
559 void rpcrdma_put_mw(struct rpcrdma_xprt
*, struct rpcrdma_mw
*);
560 struct rpcrdma_req
*rpcrdma_buffer_get(struct rpcrdma_buffer
*);
561 void rpcrdma_buffer_put(struct rpcrdma_req
*);
562 void rpcrdma_recv_buffer_get(struct rpcrdma_req
*);
563 void rpcrdma_recv_buffer_put(struct rpcrdma_rep
*);
565 void rpcrdma_defer_mr_recovery(struct rpcrdma_mw
*);
567 struct rpcrdma_regbuf
*rpcrdma_alloc_regbuf(size_t, enum dma_data_direction
,
569 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia
*, struct rpcrdma_regbuf
*);
570 void rpcrdma_free_regbuf(struct rpcrdma_regbuf
*);
573 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf
*rb
)
575 return rb
->rg_device
!= NULL
;
579 rpcrdma_dma_map_regbuf(struct rpcrdma_ia
*ia
, struct rpcrdma_regbuf
*rb
)
581 if (likely(rpcrdma_regbuf_is_mapped(rb
)))
583 return __rpcrdma_dma_map_regbuf(ia
, rb
);
586 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt
*, unsigned int);
588 int rpcrdma_alloc_wq(void);
589 void rpcrdma_destroy_wq(void);
592 * Wrappers for chunk registration, shared by read/write chunk code.
595 static inline enum dma_data_direction
596 rpcrdma_data_dir(bool writing
)
598 return writing
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
602 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
605 enum rpcrdma_chunktype
{
613 bool rpcrdma_prepare_send_sges(struct rpcrdma_ia
*, struct rpcrdma_req
*,
614 u32
, struct xdr_buf
*, enum rpcrdma_chunktype
);
615 void rpcrdma_unmap_sges(struct rpcrdma_ia
*, struct rpcrdma_req
*);
616 int rpcrdma_marshal_req(struct rpcrdma_xprt
*r_xprt
, struct rpc_rqst
*rqst
);
617 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt
*);
618 void rpcrdma_reply_handler(struct work_struct
*work
);
620 static inline void rpcrdma_set_xdrlen(struct xdr_buf
*xdr
, size_t len
)
622 xdr
->head
[0].iov_len
= len
;
626 /* RPC/RDMA module init - xprtrdma/transport.c
628 extern unsigned int xprt_rdma_max_inline_read
;
629 void xprt_rdma_format_addresses(struct rpc_xprt
*xprt
, struct sockaddr
*sap
);
630 void xprt_rdma_free_addresses(struct rpc_xprt
*xprt
);
631 void rpcrdma_connect_worker(struct work_struct
*work
);
632 void xprt_rdma_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
);
633 int xprt_rdma_init(void);
634 void xprt_rdma_cleanup(void);
636 /* Backchannel calls - xprtrdma/backchannel.c
638 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
639 int xprt_rdma_bc_setup(struct rpc_xprt
*, unsigned int);
640 int xprt_rdma_bc_up(struct svc_serv
*, struct net
*);
641 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt
*);
642 int rpcrdma_bc_post_recv(struct rpcrdma_xprt
*, unsigned int);
643 void rpcrdma_bc_receive_call(struct rpcrdma_xprt
*, struct rpcrdma_rep
*);
644 int rpcrdma_bc_marshal_reply(struct rpc_rqst
*);
645 void xprt_rdma_bc_free_rqst(struct rpc_rqst
*);
646 void xprt_rdma_bc_destroy(struct rpc_xprt
*, unsigned int);
647 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
649 extern struct xprt_class xprt_rdma_bc
;
651 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */