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 #include <linux/sunrpc/rdma_rn.h> /* removal notifications */
60
61 #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */
62 #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */
63
64 #define RPCRDMA_BIND_TO (60U * HZ)
65 #define RPCRDMA_INIT_REEST_TO (5U * HZ)
66 #define RPCRDMA_MAX_REEST_TO (30U * HZ)
67 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ)
68
69 /*
70 * RDMA Endpoint -- connection endpoint details
71 */
72 struct rpcrdma_mr;
73 struct rpcrdma_ep {
74 struct kref re_kref;
75 struct rdma_cm_id *re_id;
76 struct ib_pd *re_pd;
77 unsigned int re_max_rdma_segs;
78 unsigned int re_max_fr_depth;
79 struct rpcrdma_mr *re_write_pad_mr;
80 enum ib_mr_type re_mrtype;
81 struct completion re_done;
82 unsigned int re_send_count;
83 unsigned int re_send_batch;
84 unsigned int re_max_inline_send;
85 unsigned int re_max_inline_recv;
86 int re_async_rc;
87 int re_connect_status;
88 atomic_t re_receiving;
89 atomic_t re_force_disconnect;
90 struct ib_qp_init_attr re_attr;
91 wait_queue_head_t re_connect_wait;
92 struct rpc_xprt *re_xprt;
93 struct rpcrdma_connect_private
94 re_cm_private;
95 struct rdma_conn_param re_remote_cma;
96 struct rpcrdma_notification re_rn;
97 int re_receive_count;
98 unsigned int re_max_requests; /* depends on device */
99 unsigned int re_inline_send; /* negotiated */
100 unsigned int re_inline_recv; /* negotiated */
101
102 atomic_t re_completion_ids;
103
104 char re_write_pad[XDR_UNIT];
105 };
106
107 /* Pre-allocate extra Work Requests for handling reverse-direction
108 * Receives and Sends. This is a fixed value because the Work Queues
109 * are allocated when the forward channel is set up, long before the
110 * backchannel is provisioned. This value is two times
111 * NFS4_DEF_CB_SLOT_TABLE_SIZE.
112 */
113 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
114 #define RPCRDMA_BACKWARD_WRS (32)
115 #else
116 #define RPCRDMA_BACKWARD_WRS (0)
117 #endif
118
119 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
120 */
121
122 struct rpcrdma_regbuf {
123 struct ib_sge rg_iov;
124 struct ib_device *rg_device;
125 enum dma_data_direction rg_direction;
126 void *rg_data;
127 };
128
rdmab_addr(struct rpcrdma_regbuf * rb)129 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb)
130 {
131 return rb->rg_iov.addr;
132 }
133
rdmab_length(struct rpcrdma_regbuf * rb)134 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb)
135 {
136 return rb->rg_iov.length;
137 }
138
rdmab_lkey(struct rpcrdma_regbuf * rb)139 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb)
140 {
141 return rb->rg_iov.lkey;
142 }
143
rdmab_device(struct rpcrdma_regbuf * rb)144 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb)
145 {
146 return rb->rg_device;
147 }
148
rdmab_data(const struct rpcrdma_regbuf * rb)149 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
150 {
151 return rb->rg_data;
152 }
153
154 /* Do not use emergency memory reserves, and fail quickly if memory
155 * cannot be allocated easily. These flags may be used wherever there
156 * is robust logic to handle a failure to allocate.
157 */
158 #define XPRTRDMA_GFP_FLAGS (__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN)
159
160 /* To ensure a transport can always make forward progress,
161 * the number of RDMA segments allowed in header chunk lists
162 * is capped at 16. This prevents less-capable devices from
163 * overrunning the Send buffer while building chunk lists.
164 *
165 * Elements of the Read list take up more room than the
166 * Write list or Reply chunk. 16 read segments means the
167 * chunk lists cannot consume more than
168 *
169 * ((16 + 2) * read segment size) + 1 XDR words,
170 *
171 * or about 400 bytes. The fixed part of the header is
172 * another 24 bytes. Thus when the inline threshold is
173 * 1024 bytes, at least 600 bytes are available for RPC
174 * message bodies.
175 */
176 enum {
177 RPCRDMA_MAX_HDR_SEGS = 16,
178 };
179
180 /*
181 * struct rpcrdma_rep -- this structure encapsulates state required
182 * to receive and complete an RPC Reply, asychronously. It needs
183 * several pieces of state:
184 *
185 * o receive buffer and ib_sge (donated to provider)
186 * o status of receive (success or not, length, inv rkey)
187 * o bookkeeping state to get run by reply handler (XDR stream)
188 *
189 * These structures are allocated during transport initialization.
190 * N of these are associated with a transport instance, managed by
191 * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
192 */
193
194 struct rpcrdma_rep {
195 struct ib_cqe rr_cqe;
196 struct rpc_rdma_cid rr_cid;
197
198 __be32 rr_xid;
199 __be32 rr_vers;
200 __be32 rr_proc;
201 int rr_wc_flags;
202 u32 rr_inv_rkey;
203 struct rpcrdma_regbuf *rr_rdmabuf;
204 struct rpcrdma_xprt *rr_rxprt;
205 struct rpc_rqst *rr_rqst;
206 struct xdr_buf rr_hdrbuf;
207 struct xdr_stream rr_stream;
208 struct llist_node rr_node;
209 struct ib_recv_wr rr_recv_wr;
210 struct list_head rr_all;
211 };
212
213 /* To reduce the rate at which a transport invokes ib_post_recv
214 * (and thus the hardware doorbell rate), xprtrdma posts Receive
215 * WRs in batches.
216 *
217 * Setting this to zero disables Receive post batching.
218 */
219 enum {
220 RPCRDMA_MAX_RECV_BATCH = 7,
221 };
222
223 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
224 */
225 struct rpcrdma_req;
226 struct rpcrdma_sendctx {
227 struct ib_cqe sc_cqe;
228 struct rpc_rdma_cid sc_cid;
229 struct rpcrdma_req *sc_req;
230 unsigned int sc_unmap_count;
231 struct ib_sge sc_sges[];
232 };
233
234 /*
235 * struct rpcrdma_mr - external memory region metadata
236 *
237 * An external memory region is any buffer or page that is registered
238 * on the fly (ie, not pre-registered).
239 */
240 struct rpcrdma_req;
241 struct rpcrdma_mr {
242 struct list_head mr_list;
243 struct rpcrdma_req *mr_req;
244
245 struct ib_mr *mr_ibmr;
246 struct ib_device *mr_device;
247 struct scatterlist *mr_sg;
248 int mr_nents;
249 enum dma_data_direction mr_dir;
250 struct ib_cqe mr_cqe;
251 struct completion mr_linv_done;
252 union {
253 struct ib_reg_wr mr_regwr;
254 struct ib_send_wr mr_invwr;
255 };
256 struct rpcrdma_xprt *mr_xprt;
257 u32 mr_handle;
258 u32 mr_length;
259 u64 mr_offset;
260 struct list_head mr_all;
261 struct rpc_rdma_cid mr_cid;
262 };
263
264 /*
265 * struct rpcrdma_req -- structure central to the request/reply sequence.
266 *
267 * N of these are associated with a transport instance, and stored in
268 * struct rpcrdma_buffer. N is the max number of outstanding requests.
269 *
270 * It includes pre-registered buffer memory for send AND recv.
271 * The recv buffer, however, is not owned by this structure, and
272 * is "donated" to the hardware when a recv is posted. When a
273 * reply is handled, the recv buffer used is given back to the
274 * struct rpcrdma_req associated with the request.
275 *
276 * In addition to the basic memory, this structure includes an array
277 * of iovs for send operations. The reason is that the iovs passed to
278 * ib_post_{send,recv} must not be modified until the work request
279 * completes.
280 */
281
282 /* Maximum number of page-sized "segments" per chunk list to be
283 * registered or invalidated. Must handle a Reply chunk:
284 */
285 enum {
286 RPCRDMA_MAX_IOV_SEGS = 3,
287 RPCRDMA_MAX_DATA_SEGS = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
288 RPCRDMA_MAX_SEGS = RPCRDMA_MAX_DATA_SEGS +
289 RPCRDMA_MAX_IOV_SEGS,
290 };
291
292 /* Arguments for DMA mapping and registration */
293 struct rpcrdma_mr_seg {
294 u32 mr_len; /* length of segment */
295 struct page *mr_page; /* underlying struct page */
296 u64 mr_offset; /* IN: page offset, OUT: iova */
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 ib_send_wr rl_wr;
323 struct rpcrdma_sendctx *rl_sendctx;
324 struct rpcrdma_regbuf *rl_rdmabuf; /* xprt header */
325 struct rpcrdma_regbuf *rl_sendbuf; /* rq_snd_buf */
326 struct rpcrdma_regbuf *rl_recvbuf; /* rq_rcv_buf */
327
328 struct list_head rl_all;
329 struct kref rl_kref;
330
331 struct list_head rl_free_mrs;
332 struct list_head rl_registered;
333 struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];
334 };
335
336 static inline struct rpcrdma_req *
rpcr_to_rdmar(const struct rpc_rqst * rqst)337 rpcr_to_rdmar(const struct rpc_rqst *rqst)
338 {
339 return container_of(rqst, struct rpcrdma_req, rl_slot);
340 }
341
342 static inline void
rpcrdma_mr_push(struct rpcrdma_mr * mr,struct list_head * list)343 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list)
344 {
345 list_add(&mr->mr_list, list);
346 }
347
348 static inline struct rpcrdma_mr *
rpcrdma_mr_pop(struct list_head * list)349 rpcrdma_mr_pop(struct list_head *list)
350 {
351 struct rpcrdma_mr *mr;
352
353 mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list);
354 if (mr)
355 list_del_init(&mr->mr_list);
356 return mr;
357 }
358
359 /*
360 * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
361 * inline requests/replies, and client/server credits.
362 *
363 * One of these is associated with a transport instance
364 */
365 struct rpcrdma_buffer {
366 spinlock_t rb_lock;
367 struct list_head rb_send_bufs;
368 struct list_head rb_mrs;
369
370 unsigned long rb_sc_head;
371 unsigned long rb_sc_tail;
372 unsigned long rb_sc_last;
373 struct rpcrdma_sendctx **rb_sc_ctxs;
374
375 struct list_head rb_allreqs;
376 struct list_head rb_all_mrs;
377 struct list_head rb_all_reps;
378
379 struct llist_head rb_free_reps;
380
381 __be32 rb_max_requests;
382 u32 rb_credits; /* most recent credit grant */
383
384 u32 rb_bc_srv_max_requests;
385 u32 rb_bc_max_requests;
386
387 struct work_struct rb_refresh_worker;
388 };
389
390 /*
391 * Statistics for RPCRDMA
392 */
393 struct rpcrdma_stats {
394 /* accessed when sending a call */
395 unsigned long read_chunk_count;
396 unsigned long write_chunk_count;
397 unsigned long reply_chunk_count;
398 unsigned long long total_rdma_request;
399
400 /* rarely accessed error counters */
401 unsigned long long pullup_copy_count;
402 unsigned long hardway_register_count;
403 unsigned long failed_marshal_count;
404 unsigned long bad_reply_count;
405 unsigned long mrs_recycled;
406 unsigned long mrs_orphaned;
407 unsigned long mrs_allocated;
408 unsigned long empty_sendctx_q;
409
410 /* accessed when receiving a reply */
411 unsigned long long total_rdma_reply;
412 unsigned long long fixup_copy_count;
413 unsigned long reply_waits_for_send;
414 unsigned long local_inv_needed;
415 unsigned long nomsg_call_count;
416 unsigned long bcall_count;
417 };
418
419 /*
420 * RPCRDMA transport -- encapsulates the structures above for
421 * integration with RPC.
422 *
423 * The contained structures are embedded, not pointers,
424 * for convenience. This structure need not be visible externally.
425 *
426 * It is allocated and initialized during mount, and released
427 * during unmount.
428 */
429 struct rpcrdma_xprt {
430 struct rpc_xprt rx_xprt;
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 * Endpoint calls - xprtrdma/verbs.c
464 */
465 void rpcrdma_force_disconnect(struct rpcrdma_ep *ep);
466 void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc);
467 int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt);
468 void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt);
469
470 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, int needed);
471
472 /*
473 * Buffer calls - xprtrdma/verbs.c
474 */
475 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt,
476 size_t size);
477 int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
478 void rpcrdma_req_destroy(struct rpcrdma_req *req);
479 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
480 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
481 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
482
483 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
484 void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt);
485
486 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
487 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers,
488 struct rpcrdma_req *req);
489 void rpcrdma_rep_put(struct rpcrdma_buffer *buf, struct rpcrdma_rep *rep);
490 void rpcrdma_reply_put(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req);
491
492 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size,
493 gfp_t flags);
494 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
495 struct rpcrdma_regbuf *rb);
496
497 /**
498 * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped
499 *
500 * Returns true if the buffer is now mapped to rb->rg_device.
501 */
rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf * rb)502 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
503 {
504 return rb->rg_device != NULL;
505 }
506
507 /**
508 * rpcrdma_regbuf_dma_map - DMA-map a regbuf
509 * @r_xprt: controlling transport instance
510 * @rb: regbuf to be mapped
511 *
512 * Returns true if the buffer is currently DMA mapped.
513 */
rpcrdma_regbuf_dma_map(struct rpcrdma_xprt * r_xprt,struct rpcrdma_regbuf * rb)514 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
515 struct rpcrdma_regbuf *rb)
516 {
517 if (likely(rpcrdma_regbuf_is_mapped(rb)))
518 return true;
519 return __rpcrdma_regbuf_dma_map(r_xprt, rb);
520 }
521
522 /*
523 * Wrappers for chunk registration, shared by read/write chunk code.
524 */
525
526 static inline enum dma_data_direction
rpcrdma_data_dir(bool writing)527 rpcrdma_data_dir(bool writing)
528 {
529 return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
530 }
531
532 /* Memory registration calls xprtrdma/frwr_ops.c
533 */
534 void frwr_reset(struct rpcrdma_req *req);
535 int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device);
536 int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr);
537 void frwr_mr_release(struct rpcrdma_mr *mr);
538 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
539 struct rpcrdma_mr_seg *seg,
540 int nsegs, bool writing, __be32 xid,
541 struct rpcrdma_mr *mr);
542 int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
543 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
544 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
545 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
546 int frwr_wp_create(struct rpcrdma_xprt *r_xprt);
547
548 /*
549 * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
550 */
551
552 enum rpcrdma_chunktype {
553 rpcrdma_noch = 0,
554 rpcrdma_noch_pullup,
555 rpcrdma_noch_mapped,
556 rpcrdma_readch,
557 rpcrdma_areadch,
558 rpcrdma_writech,
559 rpcrdma_replych
560 };
561
562 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
563 struct rpcrdma_req *req, u32 hdrlen,
564 struct xdr_buf *xdr,
565 enum rpcrdma_chunktype rtype);
566 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc);
567 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
568 void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep);
569 void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt);
570 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
571 void rpcrdma_unpin_rqst(struct rpcrdma_rep *rep);
572 void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
573
rpcrdma_set_xdrlen(struct xdr_buf * xdr,size_t len)574 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
575 {
576 xdr->head[0].iov_len = len;
577 xdr->len = len;
578 }
579
580 /* RPC/RDMA module init - xprtrdma/transport.c
581 */
582 extern unsigned int xprt_rdma_max_inline_read;
583 extern unsigned int xprt_rdma_max_inline_write;
584 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
585 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
586 void xprt_rdma_close(struct rpc_xprt *xprt);
587 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
588 int xprt_rdma_init(void);
589 void xprt_rdma_cleanup(void);
590
591 /* Backchannel calls - xprtrdma/backchannel.c
592 */
593 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
594 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
595 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
596 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *);
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