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
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7 * COPYING in the main directory of this source tree, or the BSD-type
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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 */
59 * Interface Adapter -- one per transport instance
62 const struct rpcrdma_memreg_ops
*ri_ops
;
64 struct ib_device
*ri_device
;
65 struct rdma_cm_id
*ri_id
;
67 struct ib_mr
*ri_dma_mr
;
68 struct completion ri_done
;
70 unsigned int ri_max_frmr_depth
;
71 struct ib_device_attr ri_devattr
;
72 struct ib_qp_attr ri_qp_attr
;
73 struct ib_qp_init_attr ri_qp_init_attr
;
77 * RDMA Endpoint -- one per transport instance
80 #define RPCRDMA_WC_BUDGET (128)
81 #define RPCRDMA_POLLSIZE (16)
87 struct ib_qp_init_attr rep_attr
;
88 wait_queue_head_t rep_connect_wait
;
89 struct rdma_conn_param rep_remote_cma
;
90 struct sockaddr_storage rep_remote_addr
;
91 struct delayed_work rep_connect_worker
;
92 struct ib_wc rep_send_wcs
[RPCRDMA_POLLSIZE
];
93 struct ib_wc rep_recv_wcs
[RPCRDMA_POLLSIZE
];
97 * Force a signaled SEND Work Request every so often,
98 * in case the provider needs to do some housekeeping.
100 #define RPCRDMA_MAX_UNSIGNALED_SENDS (32)
102 #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
103 #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
105 /* Force completion handler to ignore the signal
107 #define RPCRDMA_IGNORE_COMPLETION (0ULL)
109 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
111 * The below structure appears at the front of a large region of kmalloc'd
112 * memory, which always starts on a good alignment boundary.
115 struct rpcrdma_regbuf
{
117 struct rpcrdma_req
*rg_owner
;
118 struct ib_sge rg_iov
;
119 __be32 rg_base
[0] __attribute__ ((aligned(256)));
123 rdmab_addr(struct rpcrdma_regbuf
*rb
)
125 return rb
->rg_iov
.addr
;
129 rdmab_length(struct rpcrdma_regbuf
*rb
)
131 return rb
->rg_iov
.length
;
135 rdmab_lkey(struct rpcrdma_regbuf
*rb
)
137 return rb
->rg_iov
.lkey
;
140 static inline struct rpcrdma_msg
*
141 rdmab_to_msg(struct rpcrdma_regbuf
*rb
)
143 return (struct rpcrdma_msg
*)rb
->rg_base
;
147 * struct rpcrdma_rep -- this structure encapsulates state required to recv
148 * and complete a reply, asychronously. It needs several pieces of
150 * o recv buffer (posted to provider)
151 * o ib_sge (also donated to provider)
152 * o status of reply (length, success or not)
153 * o bookkeeping state to get run by tasklet (list, etc)
155 * These are allocated during initialization, per-transport instance;
156 * however, the tasklet execution list itself is global, as it should
157 * always be pretty short.
159 * N of these are associated with a transport instance, and stored in
160 * struct rpcrdma_buffer. N is the max number of outstanding requests.
163 #define RPCRDMA_MAX_DATA_SEGS ((1 * 1024 * 1024) / PAGE_SIZE)
164 #define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
166 struct rpcrdma_buffer
;
170 struct ib_device
*rr_device
;
171 struct rpcrdma_xprt
*rr_rxprt
;
172 struct list_head rr_list
;
173 struct rpcrdma_regbuf
*rr_rdmabuf
;
177 * struct rpcrdma_mw - external memory region metadata
179 * An external memory region is any buffer or page that is registered
180 * on the fly (ie, not pre-registered).
182 * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
183 * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
184 * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
185 * track of registration metadata while each RPC is pending.
186 * rpcrdma_deregister_external() uses this metadata to unmap and
187 * release these resources when an RPC is complete.
189 enum rpcrdma_frmr_state
{
190 FRMR_IS_INVALID
, /* ready to be used */
191 FRMR_IS_VALID
, /* in use */
192 FRMR_IS_STALE
, /* failed completion */
195 struct rpcrdma_frmr
{
196 struct ib_fast_reg_page_list
*fr_pgl
;
198 enum rpcrdma_frmr_state fr_state
;
199 struct work_struct fr_work
;
200 struct rpcrdma_xprt
*fr_xprt
;
210 struct rpcrdma_fmr fmr
;
211 struct rpcrdma_frmr frmr
;
213 void (*mw_sendcompletion
)(struct ib_wc
*);
214 struct list_head mw_list
;
215 struct list_head mw_all
;
219 * struct rpcrdma_req -- structure central to the request/reply sequence.
221 * N of these are associated with a transport instance, and stored in
222 * struct rpcrdma_buffer. N is the max number of outstanding requests.
224 * It includes pre-registered buffer memory for send AND recv.
225 * The recv buffer, however, is not owned by this structure, and
226 * is "donated" to the hardware when a recv is posted. When a
227 * reply is handled, the recv buffer used is given back to the
228 * struct rpcrdma_req associated with the request.
230 * In addition to the basic memory, this structure includes an array
231 * of iovs for send operations. The reason is that the iovs passed to
232 * ib_post_{send,recv} must not be modified until the work request
236 * o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we
237 * marshal. The number needed varies depending on the iov lists that
238 * are passed to us, the memory registration mode we are in, and if
239 * physical addressing is used, the layout.
242 struct rpcrdma_mr_seg
{ /* chunk descriptors */
243 struct rpcrdma_mw
*rl_mw
; /* registered MR */
244 u64 mr_base
; /* registration result */
245 u32 mr_rkey
; /* registration result */
246 u32 mr_len
; /* length of chunk or segment */
247 int mr_nsegs
; /* number of segments in chunk or 0 */
248 enum dma_data_direction mr_dir
; /* segment mapping direction */
249 dma_addr_t mr_dma
; /* segment mapping address */
250 size_t mr_dmalen
; /* segment mapping length */
251 struct page
*mr_page
; /* owning page, if any */
252 char *mr_offset
; /* kva if no page, else offset */
255 #define RPCRDMA_MAX_IOVS (2)
258 unsigned int rl_niovs
;
259 unsigned int rl_nchunks
;
260 unsigned int rl_connect_cookie
;
261 struct rpcrdma_buffer
*rl_buffer
;
262 struct rpcrdma_rep
*rl_reply
;/* holder for reply buffer */
263 struct ib_sge rl_send_iov
[RPCRDMA_MAX_IOVS
];
264 struct rpcrdma_regbuf
*rl_rdmabuf
;
265 struct rpcrdma_regbuf
*rl_sendbuf
;
266 struct rpcrdma_mr_seg rl_segments
[RPCRDMA_MAX_SEGS
];
269 static inline struct rpcrdma_req
*
270 rpcr_to_rdmar(struct rpc_rqst
*rqst
)
272 void *buffer
= rqst
->rq_buffer
;
273 struct rpcrdma_regbuf
*rb
;
275 rb
= container_of(buffer
, struct rpcrdma_regbuf
, rg_base
);
280 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
281 * inline requests/replies, and client/server credits.
283 * One of these is associated with a transport instance
285 struct rpcrdma_buffer
{
286 spinlock_t rb_mwlock
; /* protect rb_mws list */
287 struct list_head rb_mws
;
288 struct list_head rb_all
;
291 spinlock_t rb_lock
; /* protect buf arrays */
295 struct rpcrdma_req
**rb_send_bufs
;
296 struct rpcrdma_rep
**rb_recv_bufs
;
298 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
301 * Internal structure for transport instance creation. This
302 * exists primarily for modularity.
304 * This data should be set with mount options
306 struct rpcrdma_create_data_internal
{
307 struct sockaddr_storage addr
; /* RDMA server address */
308 unsigned int max_requests
; /* max requests (slots) in flight */
309 unsigned int rsize
; /* mount rsize - max read hdr+data */
310 unsigned int wsize
; /* mount wsize - max write hdr+data */
311 unsigned int inline_rsize
; /* max non-rdma read data payload */
312 unsigned int inline_wsize
; /* max non-rdma write data payload */
313 unsigned int padding
; /* non-rdma write header padding */
316 #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
317 (rpcx_to_rdmad(rq->rq_xprt).inline_rsize)
319 #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
320 (rpcx_to_rdmad(rq->rq_xprt).inline_wsize)
322 #define RPCRDMA_INLINE_PAD_VALUE(rq)\
323 rpcx_to_rdmad(rq->rq_xprt).padding
326 * Statistics for RPCRDMA
328 struct rpcrdma_stats
{
329 unsigned long read_chunk_count
;
330 unsigned long write_chunk_count
;
331 unsigned long reply_chunk_count
;
333 unsigned long long total_rdma_request
;
334 unsigned long long total_rdma_reply
;
336 unsigned long long pullup_copy_count
;
337 unsigned long long fixup_copy_count
;
338 unsigned long hardway_register_count
;
339 unsigned long failed_marshal_count
;
340 unsigned long bad_reply_count
;
341 unsigned long nomsg_call_count
;
345 * Per-registration mode operations
348 struct rpcrdma_memreg_ops
{
349 int (*ro_map
)(struct rpcrdma_xprt
*,
350 struct rpcrdma_mr_seg
*, int, bool);
351 int (*ro_unmap
)(struct rpcrdma_xprt
*,
352 struct rpcrdma_mr_seg
*);
353 int (*ro_open
)(struct rpcrdma_ia
*,
355 struct rpcrdma_create_data_internal
*);
356 size_t (*ro_maxpages
)(struct rpcrdma_xprt
*);
357 int (*ro_init
)(struct rpcrdma_xprt
*);
358 void (*ro_destroy
)(struct rpcrdma_buffer
*);
359 const char *ro_displayname
;
362 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops
;
363 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops
;
364 extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops
;
367 * RPCRDMA transport -- encapsulates the structures above for
368 * integration with RPC.
370 * The contained structures are embedded, not pointers,
371 * for convenience. This structure need not be visible externally.
373 * It is allocated and initialized during mount, and released
376 struct rpcrdma_xprt
{
377 struct rpc_xprt rx_xprt
;
378 struct rpcrdma_ia rx_ia
;
379 struct rpcrdma_ep rx_ep
;
380 struct rpcrdma_buffer rx_buf
;
381 struct rpcrdma_create_data_internal rx_data
;
382 struct delayed_work rx_connect_worker
;
383 struct rpcrdma_stats rx_stats
;
386 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
387 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
389 /* Setting this to 0 ensures interoperability with early servers.
390 * Setting this to 1 enhances certain unaligned read/write performance.
391 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
392 extern int xprt_rdma_pad_optimize
;
395 * Interface Adapter calls - xprtrdma/verbs.c
397 int rpcrdma_ia_open(struct rpcrdma_xprt
*, struct sockaddr
*, int);
398 void rpcrdma_ia_close(struct rpcrdma_ia
*);
401 * Endpoint calls - xprtrdma/verbs.c
403 int rpcrdma_ep_create(struct rpcrdma_ep
*, struct rpcrdma_ia
*,
404 struct rpcrdma_create_data_internal
*);
405 void rpcrdma_ep_destroy(struct rpcrdma_ep
*, struct rpcrdma_ia
*);
406 int rpcrdma_ep_connect(struct rpcrdma_ep
*, struct rpcrdma_ia
*);
407 void rpcrdma_ep_disconnect(struct rpcrdma_ep
*, struct rpcrdma_ia
*);
409 int rpcrdma_ep_post(struct rpcrdma_ia
*, struct rpcrdma_ep
*,
410 struct rpcrdma_req
*);
411 int rpcrdma_ep_post_recv(struct rpcrdma_ia
*, struct rpcrdma_ep
*,
412 struct rpcrdma_rep
*);
415 * Buffer calls - xprtrdma/verbs.c
417 int rpcrdma_buffer_create(struct rpcrdma_xprt
*);
418 void rpcrdma_buffer_destroy(struct rpcrdma_buffer
*);
420 struct rpcrdma_mw
*rpcrdma_get_mw(struct rpcrdma_xprt
*);
421 void rpcrdma_put_mw(struct rpcrdma_xprt
*, struct rpcrdma_mw
*);
422 struct rpcrdma_req
*rpcrdma_buffer_get(struct rpcrdma_buffer
*);
423 void rpcrdma_buffer_put(struct rpcrdma_req
*);
424 void rpcrdma_recv_buffer_get(struct rpcrdma_req
*);
425 void rpcrdma_recv_buffer_put(struct rpcrdma_rep
*);
427 struct rpcrdma_regbuf
*rpcrdma_alloc_regbuf(struct rpcrdma_ia
*,
429 void rpcrdma_free_regbuf(struct rpcrdma_ia
*,
430 struct rpcrdma_regbuf
*);
432 unsigned int rpcrdma_max_segments(struct rpcrdma_xprt
*);
434 int frwr_alloc_recovery_wq(void);
435 void frwr_destroy_recovery_wq(void);
438 * Wrappers for chunk registration, shared by read/write chunk code.
441 void rpcrdma_mapping_error(struct rpcrdma_mr_seg
*);
443 static inline enum dma_data_direction
444 rpcrdma_data_dir(bool writing
)
446 return writing
? DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
450 rpcrdma_map_one(struct ib_device
*device
, struct rpcrdma_mr_seg
*seg
,
451 enum dma_data_direction direction
)
453 seg
->mr_dir
= direction
;
454 seg
->mr_dmalen
= seg
->mr_len
;
457 seg
->mr_dma
= ib_dma_map_page(device
,
458 seg
->mr_page
, offset_in_page(seg
->mr_offset
),
459 seg
->mr_dmalen
, seg
->mr_dir
);
461 seg
->mr_dma
= ib_dma_map_single(device
,
463 seg
->mr_dmalen
, seg
->mr_dir
);
465 if (ib_dma_mapping_error(device
, seg
->mr_dma
))
466 rpcrdma_mapping_error(seg
);
470 rpcrdma_unmap_one(struct ib_device
*device
, struct rpcrdma_mr_seg
*seg
)
473 ib_dma_unmap_page(device
,
474 seg
->mr_dma
, seg
->mr_dmalen
, seg
->mr_dir
);
476 ib_dma_unmap_single(device
,
477 seg
->mr_dma
, seg
->mr_dmalen
, seg
->mr_dir
);
481 * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
483 void rpcrdma_connect_worker(struct work_struct
*);
484 void rpcrdma_conn_func(struct rpcrdma_ep
*);
485 void rpcrdma_reply_handler(struct rpcrdma_rep
*);
488 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
490 int rpcrdma_marshal_req(struct rpc_rqst
*);
492 /* RPC/RDMA module init - xprtrdma/transport.c
494 int xprt_rdma_init(void);
495 void xprt_rdma_cleanup(void);
497 /* Temporary NFS request map cache. Created in svc_rdma.c */
498 extern struct kmem_cache
*svc_rdma_map_cachep
;
499 /* WR context cache. Created in svc_rdma.c */
500 extern struct kmem_cache
*svc_rdma_ctxt_cachep
;
501 /* Workqueue created in svc_rdma.c */
502 extern struct workqueue_struct
*svc_rdma_wq
;
504 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */