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_cid.h> /* completion IDs */
57 #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */
58 #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */
59
60 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */
61 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */
62
63 #define RPCRDMA_BIND_TO (60U * HZ)
64 #define RPCRDMA_INIT_REEST_TO (5U * HZ)
65 #define RPCRDMA_MAX_REEST_TO (30U * HZ)
66 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
67
68 /*
69 * RDMA Endpoint -- connection endpoint details
70 */
71 struct rpcrdma_mr;
72 struct rpcrdma_ep {
73 struct kref re_kref;
74 struct rdma_cm_id *re_id;
75 struct ib_pd *re_pd;
76 unsigned int re_max_rdma_segs;
77 unsigned int re_max_fr_depth;
78 struct rpcrdma_mr *re_write_pad_mr;
79 enum ib_mr_type re_mrtype;
80 struct completion re_done;
81 unsigned int re_send_count;
82 unsigned int re_send_batch;
83 unsigned int re_max_inline_send;
84 unsigned int re_max_inline_recv;
85 int re_async_rc;
86 int re_connect_status;
87 atomic_t re_receiving;
88 atomic_t re_force_disconnect;
89 struct ib_qp_init_attr re_attr;
90 wait_queue_head_t re_connect_wait;
91 struct rpc_xprt *re_xprt;
92 struct rpcrdma_connect_private
93 re_cm_private;
94 struct rdma_conn_param re_remote_cma;
95 int re_receive_count;
96 unsigned int re_max_requests; /* depends on device */
97 unsigned int re_inline_send; /* negotiated */
98 unsigned int re_inline_recv; /* negotiated */
99
100 atomic_t re_completion_ids;
101
102 char re_write_pad[XDR_UNIT];
103 };
104
105 /* Pre-allocate extra Work Requests for handling reverse-direction
106 * Receives and Sends. This is a fixed value because the Work Queues
107 * are allocated when the forward channel is set up, long before the
108 * backchannel is provisioned. This value is two times
109 * NFS4_DEF_CB_SLOT_TABLE_SIZE.
110 */
111 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
112 #define RPCRDMA_BACKWARD_WRS (32)
113 #else
114 #define RPCRDMA_BACKWARD_WRS (0)
115 #endif
116
117 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
118 */
119
120 struct rpcrdma_regbuf {
121 struct ib_sge rg_iov;
122 struct ib_device *rg_device;
123 enum dma_data_direction rg_direction;
124 void *rg_data;
125 };
126
rdmab_addr(struct rpcrdma_regbuf * rb)127 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb)
128 {
129 return rb->rg_iov.addr;
130 }
131
rdmab_length(struct rpcrdma_regbuf * rb)132 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb)
133 {
134 return rb->rg_iov.length;
135 }
136
rdmab_lkey(struct rpcrdma_regbuf * rb)137 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb)
138 {
139 return rb->rg_iov.lkey;
140 }
141
rdmab_device(struct rpcrdma_regbuf * rb)142 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb)
143 {
144 return rb->rg_device;
145 }
146
rdmab_data(const struct rpcrdma_regbuf * rb)147 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
148 {
149 return rb->rg_data;
150 }
151
152 /* Do not use emergency memory reserves, and fail quickly if memory
153 * cannot be allocated easily. These flags may be used wherever there
154 * is robust logic to handle a failure to allocate.
155 */
156 #define XPRTRDMA_GFP_FLAGS (__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN)
157
158 /* To ensure a transport can always make forward progress,
159 * the number of RDMA segments allowed in header chunk lists
160 * is capped at 16. This prevents less-capable devices from
161 * overrunning the Send buffer while building chunk lists.
162 *
163 * Elements of the Read list take up more room than the
164 * Write list or Reply chunk. 16 read segments means the
165 * chunk lists cannot consume more than
166 *
167 * ((16 + 2) * read segment size) + 1 XDR words,
168 *
169 * or about 400 bytes. The fixed part of the header is
170 * another 24 bytes. Thus when the inline threshold is
171 * 1024 bytes, at least 600 bytes are available for RPC
172 * message bodies.
173 */
174 enum {
175 RPCRDMA_MAX_HDR_SEGS = 16,
176 };
177
178 /*
179 * struct rpcrdma_rep -- this structure encapsulates state required
180 * to receive and complete an RPC Reply, asychronously. It needs
181 * several pieces of state:
182 *
183 * o receive buffer and ib_sge (donated to provider)
184 * o status of receive (success or not, length, inv rkey)
185 * o bookkeeping state to get run by reply handler (XDR stream)
186 *
187 * These structures are allocated during transport initialization.
188 * N of these are associated with a transport instance, managed by
189 * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
190 */
191
192 struct rpcrdma_rep {
193 struct ib_cqe rr_cqe;
194 struct rpc_rdma_cid rr_cid;
195
196 __be32 rr_xid;
197 __be32 rr_vers;
198 __be32 rr_proc;
199 int rr_wc_flags;
200 u32 rr_inv_rkey;
201 bool rr_temp;
202 struct rpcrdma_regbuf *rr_rdmabuf;
203 struct rpcrdma_xprt *rr_rxprt;
204 struct rpc_rqst *rr_rqst;
205 struct xdr_buf rr_hdrbuf;
206 struct xdr_stream rr_stream;
207 struct llist_node rr_node;
208 struct ib_recv_wr rr_recv_wr;
209 struct list_head rr_all;
210 };
211
212 /* To reduce the rate at which a transport invokes ib_post_recv
213 * (and thus the hardware doorbell rate), xprtrdma posts Receive
214 * WRs in batches.
215 *
216 * Setting this to zero disables Receive post batching.
217 */
218 enum {
219 RPCRDMA_MAX_RECV_BATCH = 7,
220 };
221
222 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
223 */
224 struct rpcrdma_req;
225 struct rpcrdma_sendctx {
226 struct ib_cqe sc_cqe;
227 struct rpc_rdma_cid sc_cid;
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_req;
240 struct rpcrdma_mr {
241 struct list_head mr_list;
242 struct rpcrdma_req *mr_req;
243
244 struct ib_mr *mr_ibmr;
245 struct ib_device *mr_device;
246 struct scatterlist *mr_sg;
247 int mr_nents;
248 enum dma_data_direction mr_dir;
249 struct ib_cqe mr_cqe;
250 struct completion mr_linv_done;
251 union {
252 struct ib_reg_wr mr_regwr;
253 struct ib_send_wr mr_invwr;
254 };
255 struct rpcrdma_xprt *mr_xprt;
256 u32 mr_handle;
257 u32 mr_length;
258 u64 mr_offset;
259 struct list_head mr_all;
260 struct rpc_rdma_cid mr_cid;
261 };
262
263 /*
264 * struct rpcrdma_req -- structure central to the request/reply sequence.
265 *
266 * N of these are associated with a transport instance, and stored in
267 * struct rpcrdma_buffer. N is the max number of outstanding requests.
268 *
269 * It includes pre-registered buffer memory for send AND recv.
270 * The recv buffer, however, is not owned by this structure, and
271 * is "donated" to the hardware when a recv is posted. When a
272 * reply is handled, the recv buffer used is given back to the
273 * struct rpcrdma_req associated with the request.
274 *
275 * In addition to the basic memory, this structure includes an array
276 * of iovs for send operations. The reason is that the iovs passed to
277 * ib_post_{send,recv} must not be modified until the work request
278 * completes.
279 */
280
281 /* Maximum number of page-sized "segments" per chunk list to be
282 * registered or invalidated. Must handle a Reply chunk:
283 */
284 enum {
285 RPCRDMA_MAX_IOV_SEGS = 3,
286 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
287 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS +
288 RPCRDMA_MAX_IOV_SEGS,
289 };
290
291 /* Arguments for DMA mapping and registration */
292 struct rpcrdma_mr_seg {
293 u32 mr_len; /* length of segment */
294 struct page *mr_page; /* underlying struct page */
295 u64 mr_offset; /* IN: page offset, OUT: iova */
296 };
297
298 /* The Send SGE array is provisioned to send a maximum size
299 * inline request:
300 * - RPC-over-RDMA header
301 * - xdr_buf head iovec
302 * - RPCRDMA_MAX_INLINE bytes, in pages
303 * - xdr_buf tail iovec
304 *
305 * The actual number of array elements consumed by each RPC
306 * depends on the device's max_sge limit.
307 */
308 enum {
309 RPCRDMA_MIN_SEND_SGES = 3,
310 RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
311 RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
312 };
313
314 struct rpcrdma_buffer;
315 struct rpcrdma_req {
316 struct list_head rl_list;
317 struct rpc_rqst rl_slot;
318 struct rpcrdma_rep *rl_reply;
319 struct xdr_stream rl_stream;
320 struct xdr_buf rl_hdrbuf;
321 struct ib_send_wr rl_wr;
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 __be32 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_ep *rx_ep;
431 struct rpcrdma_buffer rx_buf;
432 struct delayed_work rx_connect_worker;
433 struct rpc_timeout rx_timeout;
434 struct rpcrdma_stats rx_stats;
435 };
436
437 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
438
439 static inline const char *
rpcrdma_addrstr(const struct rpcrdma_xprt * r_xprt)440 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt)
441 {
442 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR];
443 }
444
445 static inline const char *
rpcrdma_portstr(const struct rpcrdma_xprt * r_xprt)446 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt)
447 {
448 return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT];
449 }
450
451 /* Setting this to 0 ensures interoperability with early servers.
452 * Setting this to 1 enhances certain unaligned read/write performance.
453 * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
454 extern int xprt_rdma_pad_optimize;
455
456 /* This setting controls the hunt for a supported memory
457 * registration strategy.
458 */
459 extern unsigned int xprt_rdma_memreg_strategy;
460
461 /*
462 * Endpoint calls - xprtrdma/verbs.c
463 */
464 void rpcrdma_force_disconnect(struct rpcrdma_ep *ep);
465 void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc);
466 int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt);
467 void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt);
468
469 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed, bool temp);
470
471 /*
472 * Buffer calls - xprtrdma/verbs.c
473 */
474 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt,
475 size_t size);
476 int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
477 void rpcrdma_req_destroy(struct rpcrdma_req *req);
478 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
479 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
480 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
481
482 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
483 void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt);
484
485 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
486 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers,
487 struct rpcrdma_req *req);
488 void rpcrdma_rep_put(struct rpcrdma_buffer *buf, struct rpcrdma_rep *rep);
489 void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req);
490
491 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size,
492 gfp_t flags);
493 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
494 struct rpcrdma_regbuf *rb);
495
496 /**
497 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped
498 *
499 * Returns true if the buffer is now mapped to rb->rg_device.
500 */
rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf * rb)501 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
502 {
503 return rb->rg_device != NULL;
504 }
505
506 /**
507 * rpcrdma_regbuf_dma_map - DMA-map a regbuf
508 * @r_xprt: controlling transport instance
509 * @rb: regbuf to be mapped
510 *
511 * Returns true if the buffer is currently DMA mapped.
512 */
rpcrdma_regbuf_dma_map(struct rpcrdma_xprt * r_xprt,struct rpcrdma_regbuf * rb)513 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
514 struct rpcrdma_regbuf *rb)
515 {
516 if (likely(rpcrdma_regbuf_is_mapped(rb)))
517 return true;
518 return __rpcrdma_regbuf_dma_map(r_xprt, rb);
519 }
520
521 /*
522 * Wrappers for chunk registration, shared by read/write chunk code.
523 */
524
525 static inline enum dma_data_direction
rpcrdma_data_dir(bool writing)526 rpcrdma_data_dir(bool writing)
527 {
528 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
529 }
530
531 /* Memory registration calls xprtrdma/frwr_ops.c
532 */
533 void frwr_reset(struct rpcrdma_req *req);
534 int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device);
535 int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr);
536 void frwr_mr_release(struct rpcrdma_mr *mr);
537 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
538 struct rpcrdma_mr_seg *seg,
539 int nsegs, bool writing, __be32 xid,
540 struct rpcrdma_mr *mr);
541 int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
542 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
543 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
544 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
545 int frwr_wp_create(struct rpcrdma_xprt *r_xprt);
546
547 /*
548 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
549 */
550
551 enum rpcrdma_chunktype {
552 rpcrdma_noch = 0,
553 rpcrdma_noch_pullup,
554 rpcrdma_noch_mapped,
555 rpcrdma_readch,
556 rpcrdma_areadch,
557 rpcrdma_writech,
558 rpcrdma_replych
559 };
560
561 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
562 struct rpcrdma_req *req, u32 hdrlen,
563 struct xdr_buf *xdr,
564 enum rpcrdma_chunktype rtype);
565 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc);
566 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
567 void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep);
568 void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt);
569 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
570 void rpcrdma_unpin_rqst(struct rpcrdma_rep *rep);
571 void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
572
rpcrdma_set_xdrlen(struct xdr_buf * xdr,size_t len)573 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
574 {
575 xdr->head[0].iov_len = len;
576 xdr->len = len;
577 }
578
579 /* RPC/RDMA module init - xprtrdma/transport.c
580 */
581 extern unsigned int xprt_rdma_max_inline_read;
582 extern unsigned int xprt_rdma_max_inline_write;
583 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
584 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
585 void xprt_rdma_close(struct rpc_xprt *xprt);
586 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
587 int xprt_rdma_init(void);
588 void xprt_rdma_cleanup(void);
589
590 /* Backchannel calls - xprtrdma/backchannel.c
591 */
592 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
593 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
594 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
595 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *);
596 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
597 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
598 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst);
599 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
600 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
601 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
602
603 extern struct xprt_class xprt_rdma_bc;
604
605 #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */
606