1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /*
3 * Copyright (c) 2014-2017 Oracle. All rights reserved.
4 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the BSD-type
10 * license below:
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * Neither the name of the Network Appliance, Inc. nor the names of
25 * its contributors may be used to endorse or promote products
26 * derived from this software without specific prior written
27 * permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 */
41
42 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H
43 #define _LINUX_SUNRPC_XPRT_RDMA_H
44
45 #include <linux/wait.h> /* wait_queue_head_t, etc */
46 #include <linux/spinlock.h> /* spinlock_t, etc */
47 #include <linux/atomic.h> /* atomic_t, etc */
48 #include <linux/kref.h> /* struct kref */
49 #include <linux/workqueue.h> /* struct work_struct */
50 #include <linux/llist.h>
51
52 #include <rdma/rdma_cm.h> /* RDMA connection api */
53 #include <rdma/ib_verbs.h> /* RDMA verbs api */
54
55 #include <linux/sunrpc/clnt.h> /* rpc_xprt */
56 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */
57 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */
58
59 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */
60 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */
61
62 #define RPCRDMA_BIND_TO (60U * HZ)
63 #define RPCRDMA_INIT_REEST_TO (5U * HZ)
64 #define RPCRDMA_MAX_REEST_TO (30U * HZ)
65 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
66
67 /*
68 * Interface Adapter -- one per transport instance
69 */
70 struct rpcrdma_ia {
71 struct rdma_cm_id *ri_id;
72 struct ib_pd *ri_pd;
73 int ri_async_rc;
74 unsigned int ri_max_segs;
75 unsigned int ri_max_frwr_depth;
76 unsigned int ri_max_send_sges;
77 bool ri_implicit_roundup;
78 enum ib_mr_type ri_mrtype;
79 unsigned long ri_flags;
80 struct completion ri_done;
81 struct completion ri_remove_done;
82 };
83
84 enum {
85 RPCRDMA_IAF_REMOVING = 0,
86 };
87
88 /*
89 * RDMA Endpoint -- one per transport instance
90 */
91
92 struct rpcrdma_ep {
93 unsigned int rep_send_count;
94 unsigned int rep_send_batch;
95 unsigned int rep_max_inline_send;
96 unsigned int rep_max_inline_recv;
97 int rep_connected;
98 struct ib_qp_init_attr rep_attr;
99 wait_queue_head_t rep_connect_wait;
100 struct rpcrdma_connect_private rep_cm_private;
101 struct rdma_conn_param rep_remote_cma;
102 unsigned int rep_max_requests; /* set by /proc */
103 unsigned int rep_inline_send; /* negotiated */
104 unsigned int rep_inline_recv; /* negotiated */
105 int rep_receive_count;
106 };
107
108 /* Pre-allocate extra Work Requests for handling backward receives
109 * and sends. This is a fixed value because the Work Queues are
110 * allocated when the forward channel is set up, long before the
111 * backchannel is provisioned. This value is two times
112 * NFS4_DEF_CB_SLOT_TABLE_SIZE.
113 */
114 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
115 #define RPCRDMA_BACKWARD_WRS (32)
116 #else
117 #define RPCRDMA_BACKWARD_WRS (0)
118 #endif
119
120 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
121 */
122
123 struct rpcrdma_regbuf {
124 struct ib_sge rg_iov;
125 struct ib_device *rg_device;
126 enum dma_data_direction rg_direction;
127 void *rg_data;
128 };
129
rdmab_addr(struct rpcrdma_regbuf * rb)130 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb)
131 {
132 return rb->rg_iov.addr;
133 }
134
rdmab_length(struct rpcrdma_regbuf * rb)135 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb)
136 {
137 return rb->rg_iov.length;
138 }
139
rdmab_lkey(struct rpcrdma_regbuf * rb)140 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb)
141 {
142 return rb->rg_iov.lkey;
143 }
144
rdmab_device(struct rpcrdma_regbuf * rb)145 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb)
146 {
147 return rb->rg_device;
148 }
149
rdmab_data(const struct rpcrdma_regbuf * rb)150 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
151 {
152 return rb->rg_data;
153 }
154
155 #define RPCRDMA_DEF_GFP (GFP_NOIO | __GFP_NOWARN)
156
157 /* To ensure a transport can always make forward progress,
158 * the number of RDMA segments allowed in header chunk lists
159 * is capped at 16. This prevents less-capable devices from
160 * overrunning the Send buffer while building chunk lists.
161 *
162 * Elements of the Read list take up more room than the
163 * Write list or Reply chunk. 16 read segments means the
164 * chunk lists cannot consume more than
165 *
166 * ((16 + 2) * read segment size) + 1 XDR words,
167 *
168 * or about 400 bytes. The fixed part of the header is
169 * another 24 bytes. Thus when the inline threshold is
170 * 1024 bytes, at least 600 bytes are available for RPC
171 * message bodies.
172 */
173 enum {
174 RPCRDMA_MAX_HDR_SEGS = 16,
175 };
176
177 /*
178 * struct rpcrdma_rep -- this structure encapsulates state required
179 * to receive and complete an RPC Reply, asychronously. It needs
180 * several pieces of state:
181 *
182 * o receive buffer and ib_sge (donated to provider)
183 * o status of receive (success or not, length, inv rkey)
184 * o bookkeeping state to get run by reply handler (XDR stream)
185 *
186 * These structures are allocated during transport initialization.
187 * N of these are associated with a transport instance, managed by
188 * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
189 */
190
191 struct rpcrdma_rep {
192 struct ib_cqe rr_cqe;
193 __be32 rr_xid;
194 __be32 rr_vers;
195 __be32 rr_proc;
196 int rr_wc_flags;
197 u32 rr_inv_rkey;
198 bool rr_temp;
199 struct rpcrdma_regbuf *rr_rdmabuf;
200 struct rpcrdma_xprt *rr_rxprt;
201 struct rpc_rqst *rr_rqst;
202 struct xdr_buf rr_hdrbuf;
203 struct xdr_stream rr_stream;
204 struct llist_node rr_node;
205 struct ib_recv_wr rr_recv_wr;
206 struct list_head rr_all;
207 };
208
209 /* To reduce the rate at which a transport invokes ib_post_recv
210 * (and thus the hardware doorbell rate), xprtrdma posts Receive
211 * WRs in batches.
212 *
213 * Setting this to zero disables Receive post batching.
214 */
215 enum {
216 RPCRDMA_MAX_RECV_BATCH = 7,
217 };
218
219 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
220 */
221 struct rpcrdma_req;
222 struct rpcrdma_xprt;
223 struct rpcrdma_sendctx {
224 struct ib_send_wr sc_wr;
225 struct ib_cqe sc_cqe;
226 struct ib_device *sc_device;
227 struct rpcrdma_xprt *sc_xprt;
228 struct rpcrdma_req *sc_req;
229 unsigned int sc_unmap_count;
230 struct ib_sge sc_sges[];
231 };
232
233 /*
234 * struct rpcrdma_mr - external memory region metadata
235 *
236 * An external memory region is any buffer or page that is registered
237 * on the fly (ie, not pre-registered).
238 */
239 struct rpcrdma_frwr {
240 struct ib_mr *fr_mr;
241 struct ib_cqe fr_cqe;
242 struct completion fr_linv_done;
243 union {
244 struct ib_reg_wr fr_regwr;
245 struct ib_send_wr fr_invwr;
246 };
247 };
248
249 struct rpcrdma_req;
250 struct rpcrdma_mr {
251 struct list_head mr_list;
252 struct rpcrdma_req *mr_req;
253 struct scatterlist *mr_sg;
254 int mr_nents;
255 enum dma_data_direction mr_dir;
256 struct rpcrdma_frwr frwr;
257 struct rpcrdma_xprt *mr_xprt;
258 u32 mr_handle;
259 u32 mr_length;
260 u64 mr_offset;
261 struct work_struct mr_recycle;
262 struct list_head mr_all;
263 };
264
265 /*
266 * struct rpcrdma_req -- structure central to the request/reply sequence.
267 *
268 * N of these are associated with a transport instance, and stored in
269 * struct rpcrdma_buffer. N is the max number of outstanding requests.
270 *
271 * It includes pre-registered buffer memory for send AND recv.
272 * The recv buffer, however, is not owned by this structure, and
273 * is "donated" to the hardware when a recv is posted. When a
274 * reply is handled, the recv buffer used is given back to the
275 * struct rpcrdma_req associated with the request.
276 *
277 * In addition to the basic memory, this structure includes an array
278 * of iovs for send operations. The reason is that the iovs passed to
279 * ib_post_{send,recv} must not be modified until the work request
280 * completes.
281 */
282
283 /* Maximum number of page-sized "segments" per chunk list to be
284 * registered or invalidated. Must handle a Reply chunk:
285 */
286 enum {
287 RPCRDMA_MAX_IOV_SEGS = 3,
288 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
289 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS +
290 RPCRDMA_MAX_IOV_SEGS,
291 };
292
293 struct rpcrdma_mr_seg { /* chunk descriptors */
294 u32 mr_len; /* length of chunk or segment */
295 struct page *mr_page; /* owning page, if any */
296 char *mr_offset; /* kva if no page, else offset */
297 };
298
299 /* The Send SGE array is provisioned to send a maximum size
300 * inline request:
301 * - RPC-over-RDMA header
302 * - xdr_buf head iovec
303 * - RPCRDMA_MAX_INLINE bytes, in pages
304 * - xdr_buf tail iovec
305 *
306 * The actual number of array elements consumed by each RPC
307 * depends on the device's max_sge limit.
308 */
309 enum {
310 RPCRDMA_MIN_SEND_SGES = 3,
311 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
312 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
313 };
314
315 struct rpcrdma_buffer;
316 struct rpcrdma_req {
317 struct list_head rl_list;
318 struct rpc_rqst rl_slot;
319 struct rpcrdma_rep *rl_reply;
320 struct xdr_stream rl_stream;
321 struct xdr_buf rl_hdrbuf;
322 struct rpcrdma_sendctx *rl_sendctx;
323 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */
324 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */
325 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */
326
327 struct list_head rl_all;
328 struct kref rl_kref;
329
330 struct list_head rl_free_mrs;
331 struct list_head rl_registered;
332 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];
333 };
334
335 static inline struct rpcrdma_req *
rpcr_to_rdmar(const struct rpc_rqst * rqst)336 rpcr_to_rdmar(const struct rpc_rqst *rqst)
337 {
338 return container_of(rqst, struct rpcrdma_req, rl_slot);
339 }
340
341 static inline void
rpcrdma_mr_push(struct rpcrdma_mr * mr,struct list_head * list)342 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list)
343 {
344 list_add(&mr->mr_list, list);
345 }
346
347 static inline struct rpcrdma_mr *
rpcrdma_mr_pop(struct list_head * list)348 rpcrdma_mr_pop(struct list_head *list)
349 {
350 struct rpcrdma_mr *mr;
351
352 mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list);
353 if (mr)
354 list_del_init(&mr->mr_list);
355 return mr;
356 }
357
358 /*
359 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
360 * inline requests/replies, and client/server credits.
361 *
362 * One of these is associated with a transport instance
363 */
364 struct rpcrdma_buffer {
365 spinlock_t rb_lock;
366 struct list_head rb_send_bufs;
367 struct list_head rb_mrs;
368
369 unsigned long rb_sc_head;
370 unsigned long rb_sc_tail;
371 unsigned long rb_sc_last;
372 struct rpcrdma_sendctx **rb_sc_ctxs;
373
374 struct list_head rb_allreqs;
375 struct list_head rb_all_mrs;
376 struct list_head rb_all_reps;
377
378 struct llist_head rb_free_reps;
379
380 u32 rb_max_requests;
381 u32 rb_credits; /* most recent credit grant */
382
383 u32 rb_bc_srv_max_requests;
384 u32 rb_bc_max_requests;
385
386 struct work_struct rb_refresh_worker;
387 };
388
389 /*
390 * Statistics for RPCRDMA
391 */
392 struct rpcrdma_stats {
393 /* accessed when sending a call */
394 unsigned long read_chunk_count;
395 unsigned long write_chunk_count;
396 unsigned long reply_chunk_count;
397 unsigned long long total_rdma_request;
398
399 /* rarely accessed error counters */
400 unsigned long long pullup_copy_count;
401 unsigned long hardway_register_count;
402 unsigned long failed_marshal_count;
403 unsigned long bad_reply_count;
404 unsigned long mrs_recycled;
405 unsigned long mrs_orphaned;
406 unsigned long mrs_allocated;
407 unsigned long empty_sendctx_q;
408
409 /* accessed when receiving a reply */
410 unsigned long long total_rdma_reply;
411 unsigned long long fixup_copy_count;
412 unsigned long reply_waits_for_send;
413 unsigned long local_inv_needed;
414 unsigned long nomsg_call_count;
415 unsigned long bcall_count;
416 };
417
418 /*
419 * RPCRDMA transport -- encapsulates the structures above for
420 * integration with RPC.
421 *
422 * The contained structures are embedded, not pointers,
423 * for convenience. This structure need not be visible externally.
424 *
425 * It is allocated and initialized during mount, and released
426 * during unmount.
427 */
428 struct rpcrdma_xprt {
429 struct rpc_xprt rx_xprt;
430 struct rpcrdma_ia rx_ia;
431 struct rpcrdma_ep rx_ep;
432 struct rpcrdma_buffer rx_buf;
433 struct delayed_work rx_connect_worker;
434 struct rpc_timeout rx_timeout;
435 struct rpcrdma_stats rx_stats;
436 };
437
438 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
439
440 static inline const char *
rpcrdma_addrstr(const struct rpcrdma_xprt * r_xprt)441 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt)
442 {
443 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR];
444 }
445
446 static inline const char *
rpcrdma_portstr(const struct rpcrdma_xprt * r_xprt)447 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt)
448 {
449 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT];
450 }
451
452 /* Setting this to 0 ensures interoperability with early servers.
453 * Setting this to 1 enhances certain unaligned read/write performance.
454 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
455 extern int xprt_rdma_pad_optimize;
456
457 /* This setting controls the hunt for a supported memory
458 * registration strategy.
459 */
460 extern unsigned int xprt_rdma_memreg_strategy;
461
462 /*
463 * Interface Adapter calls - xprtrdma/verbs.c
464 */
465 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt);
466 void rpcrdma_ia_remove(struct rpcrdma_ia *ia);
467 void rpcrdma_ia_close(struct rpcrdma_ia *);
468
469 /*
470 * Endpoint calls - xprtrdma/verbs.c
471 */
472 int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt);
473 void rpcrdma_ep_destroy(struct rpcrdma_xprt *r_xprt);
474 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
475 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
476
477 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
478 struct rpcrdma_req *);
479 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
480
481 /*
482 * Buffer calls - xprtrdma/verbs.c
483 */
484 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
485 gfp_t flags);
486 void rpcrdma_req_destroy(struct rpcrdma_req *req);
487 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
488 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
489 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
490
491 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
492 void rpcrdma_mr_put(struct rpcrdma_mr *mr);
493
494 static inline void
rpcrdma_mr_recycle(struct rpcrdma_mr * mr)495 rpcrdma_mr_recycle(struct rpcrdma_mr *mr)
496 {
497 schedule_work(&mr->mr_recycle);
498 }
499
500 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
501 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers,
502 struct rpcrdma_req *req);
503 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
504
505 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size,
506 gfp_t flags);
507 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
508 struct rpcrdma_regbuf *rb);
509
510 /**
511 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped
512 *
513 * Returns true if the buffer is now mapped to rb->rg_device.
514 */
rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf * rb)515 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
516 {
517 return rb->rg_device != NULL;
518 }
519
520 /**
521 * rpcrdma_regbuf_dma_map - DMA-map a regbuf
522 * @r_xprt: controlling transport instance
523 * @rb: regbuf to be mapped
524 *
525 * Returns true if the buffer is currently DMA mapped.
526 */
rpcrdma_regbuf_dma_map(struct rpcrdma_xprt * r_xprt,struct rpcrdma_regbuf * rb)527 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
528 struct rpcrdma_regbuf *rb)
529 {
530 if (likely(rpcrdma_regbuf_is_mapped(rb)))
531 return true;
532 return __rpcrdma_regbuf_dma_map(r_xprt, rb);
533 }
534
535 /*
536 * Wrappers for chunk registration, shared by read/write chunk code.
537 */
538
539 static inline enum dma_data_direction
rpcrdma_data_dir(bool writing)540 rpcrdma_data_dir(bool writing)
541 {
542 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
543 }
544
545 /* Memory registration calls xprtrdma/frwr_ops.c
546 */
547 bool frwr_is_supported(struct ib_device *device);
548 void frwr_recycle(struct rpcrdma_req *req);
549 void frwr_reset(struct rpcrdma_req *req);
550 int frwr_open(struct rpcrdma_ia *ia, struct rpcrdma_ep *ep);
551 int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr);
552 void frwr_release_mr(struct rpcrdma_mr *mr);
553 size_t frwr_maxpages(struct rpcrdma_xprt *r_xprt);
554 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
555 struct rpcrdma_mr_seg *seg,
556 int nsegs, bool writing, __be32 xid,
557 struct rpcrdma_mr *mr);
558 int frwr_send(struct rpcrdma_ia *ia, struct rpcrdma_req *req);
559 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
560 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
561 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
562
563 /*
564 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
565 */
566
567 enum rpcrdma_chunktype {
568 rpcrdma_noch = 0,
569 rpcrdma_readch,
570 rpcrdma_areadch,
571 rpcrdma_writech,
572 rpcrdma_replych
573 };
574
575 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
576 struct rpcrdma_req *req, u32 hdrlen,
577 struct xdr_buf *xdr,
578 enum rpcrdma_chunktype rtype);
579 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc);
580 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
581 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *);
582 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
583 void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
584
rpcrdma_set_xdrlen(struct xdr_buf * xdr,size_t len)585 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
586 {
587 xdr->head[0].iov_len = len;
588 xdr->len = len;
589 }
590
591 /* RPC/RDMA module init - xprtrdma/transport.c
592 */
593 extern unsigned int xprt_rdma_slot_table_entries;
594 extern unsigned int xprt_rdma_max_inline_read;
595 extern unsigned int xprt_rdma_max_inline_write;
596 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
597 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
598 void xprt_rdma_close(struct rpc_xprt *xprt);
599 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
600 int xprt_rdma_init(void);
601 void xprt_rdma_cleanup(void);
602
603 /* Backchannel calls - xprtrdma/backchannel.c
604 */
605 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
606 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
607 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
608 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *);
609 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
610 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
611 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst);
612 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
613 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
614 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
615
616 extern struct xprt_class xprt_rdma_bc;
617
618 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */
619