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TOMOYO Linux Cross Reference
Linux/net/sunrpc/xprtrdma/xprt_rdma.h

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  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  * RDMA Endpoint -- connection endpoint details
 69  */
 70 struct rpcrdma_ep {
 71         struct kref             re_kref;
 72         struct rdma_cm_id       *re_id;
 73         struct ib_pd            *re_pd;
 74         unsigned int            re_max_rdma_segs;
 75         unsigned int            re_max_fr_depth;
 76         bool                    re_implicit_roundup;
 77         enum ib_mr_type         re_mrtype;
 78         struct completion       re_done;
 79         unsigned int            re_send_count;
 80         unsigned int            re_send_batch;
 81         unsigned int            re_max_inline_send;
 82         unsigned int            re_max_inline_recv;
 83         int                     re_async_rc;
 84         int                     re_connect_status;
 85         atomic_t                re_force_disconnect;
 86         struct ib_qp_init_attr  re_attr;
 87         wait_queue_head_t       re_connect_wait;
 88         struct rpc_xprt         *re_xprt;
 89         struct rpcrdma_connect_private
 90                                 re_cm_private;
 91         struct rdma_conn_param  re_remote_cma;
 92         int                     re_receive_count;
 93         unsigned int            re_max_requests; /* depends on device */
 94         unsigned int            re_inline_send; /* negotiated */
 95         unsigned int            re_inline_recv; /* negotiated */
 96 };
 97 
 98 /* Pre-allocate extra Work Requests for handling backward receives
 99  * and sends. This is a fixed value because the Work Queues are
100  * allocated when the forward channel is set up, long before the
101  * backchannel is provisioned. This value is two times
102  * NFS4_DEF_CB_SLOT_TABLE_SIZE.
103  */
104 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
105 #define RPCRDMA_BACKWARD_WRS (32)
106 #else
107 #define RPCRDMA_BACKWARD_WRS (0)
108 #endif
109 
110 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
111  */
112 
113 struct rpcrdma_regbuf {
114         struct ib_sge           rg_iov;
115         struct ib_device        *rg_device;
116         enum dma_data_direction rg_direction;
117         void                    *rg_data;
118 };
119 
120 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb)
121 {
122         return rb->rg_iov.addr;
123 }
124 
125 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb)
126 {
127         return rb->rg_iov.length;
128 }
129 
130 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb)
131 {
132         return rb->rg_iov.lkey;
133 }
134 
135 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb)
136 {
137         return rb->rg_device;
138 }
139 
140 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
141 {
142         return rb->rg_data;
143 }
144 
145 #define RPCRDMA_DEF_GFP         (GFP_NOIO | __GFP_NOWARN)
146 
147 /* To ensure a transport can always make forward progress,
148  * the number of RDMA segments allowed in header chunk lists
149  * is capped at 16. This prevents less-capable devices from
150  * overrunning the Send buffer while building chunk lists.
151  *
152  * Elements of the Read list take up more room than the
153  * Write list or Reply chunk. 16 read segments means the
154  * chunk lists cannot consume more than
155  *
156  * ((16 + 2) * read segment size) + 1 XDR words,
157  *
158  * or about 400 bytes. The fixed part of the header is
159  * another 24 bytes. Thus when the inline threshold is
160  * 1024 bytes, at least 600 bytes are available for RPC
161  * message bodies.
162  */
163 enum {
164         RPCRDMA_MAX_HDR_SEGS = 16,
165 };
166 
167 /*
168  * struct rpcrdma_rep -- this structure encapsulates state required
169  * to receive and complete an RPC Reply, asychronously. It needs
170  * several pieces of state:
171  *
172  *   o receive buffer and ib_sge (donated to provider)
173  *   o status of receive (success or not, length, inv rkey)
174  *   o bookkeeping state to get run by reply handler (XDR stream)
175  *
176  * These structures are allocated during transport initialization.
177  * N of these are associated with a transport instance, managed by
178  * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
179  */
180 
181 struct rpcrdma_rep {
182         struct ib_cqe           rr_cqe;
183         __be32                  rr_xid;
184         __be32                  rr_vers;
185         __be32                  rr_proc;
186         int                     rr_wc_flags;
187         u32                     rr_inv_rkey;
188         bool                    rr_temp;
189         struct rpcrdma_regbuf   *rr_rdmabuf;
190         struct rpcrdma_xprt     *rr_rxprt;
191         struct rpc_rqst         *rr_rqst;
192         struct xdr_buf          rr_hdrbuf;
193         struct xdr_stream       rr_stream;
194         struct llist_node       rr_node;
195         struct ib_recv_wr       rr_recv_wr;
196         struct list_head        rr_all;
197 };
198 
199 /* To reduce the rate at which a transport invokes ib_post_recv
200  * (and thus the hardware doorbell rate), xprtrdma posts Receive
201  * WRs in batches.
202  *
203  * Setting this to zero disables Receive post batching.
204  */
205 enum {
206         RPCRDMA_MAX_RECV_BATCH = 7,
207 };
208 
209 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
210  */
211 struct rpcrdma_req;
212 struct rpcrdma_sendctx {
213         struct ib_cqe           sc_cqe;
214         struct rpcrdma_req      *sc_req;
215         unsigned int            sc_unmap_count;
216         struct ib_sge           sc_sges[];
217 };
218 
219 /*
220  * struct rpcrdma_mr - external memory region metadata
221  *
222  * An external memory region is any buffer or page that is registered
223  * on the fly (ie, not pre-registered).
224  */
225 struct rpcrdma_frwr {
226         struct ib_mr                    *fr_mr;
227         struct ib_cqe                   fr_cqe;
228         struct completion               fr_linv_done;
229         union {
230                 struct ib_reg_wr        fr_regwr;
231                 struct ib_send_wr       fr_invwr;
232         };
233 };
234 
235 struct rpcrdma_req;
236 struct rpcrdma_mr {
237         struct list_head        mr_list;
238         struct rpcrdma_req      *mr_req;
239         struct scatterlist      *mr_sg;
240         int                     mr_nents;
241         enum dma_data_direction mr_dir;
242         struct rpcrdma_frwr     frwr;
243         struct rpcrdma_xprt     *mr_xprt;
244         u32                     mr_handle;
245         u32                     mr_length;
246         u64                     mr_offset;
247         struct list_head        mr_all;
248 };
249 
250 /*
251  * struct rpcrdma_req -- structure central to the request/reply sequence.
252  *
253  * N of these are associated with a transport instance, and stored in
254  * struct rpcrdma_buffer. N is the max number of outstanding requests.
255  *
256  * It includes pre-registered buffer memory for send AND recv.
257  * The recv buffer, however, is not owned by this structure, and
258  * is "donated" to the hardware when a recv is posted. When a
259  * reply is handled, the recv buffer used is given back to the
260  * struct rpcrdma_req associated with the request.
261  *
262  * In addition to the basic memory, this structure includes an array
263  * of iovs for send operations. The reason is that the iovs passed to
264  * ib_post_{send,recv} must not be modified until the work request
265  * completes.
266  */
267 
268 /* Maximum number of page-sized "segments" per chunk list to be
269  * registered or invalidated. Must handle a Reply chunk:
270  */
271 enum {
272         RPCRDMA_MAX_IOV_SEGS    = 3,
273         RPCRDMA_MAX_DATA_SEGS   = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
274         RPCRDMA_MAX_SEGS        = RPCRDMA_MAX_DATA_SEGS +
275                                   RPCRDMA_MAX_IOV_SEGS,
276 };
277 
278 struct rpcrdma_mr_seg {         /* chunk descriptors */
279         u32             mr_len;         /* length of chunk or segment */
280         struct page     *mr_page;       /* owning page, if any */
281         char            *mr_offset;     /* kva if no page, else offset */
282 };
283 
284 /* The Send SGE array is provisioned to send a maximum size
285  * inline request:
286  * - RPC-over-RDMA header
287  * - xdr_buf head iovec
288  * - RPCRDMA_MAX_INLINE bytes, in pages
289  * - xdr_buf tail iovec
290  *
291  * The actual number of array elements consumed by each RPC
292  * depends on the device's max_sge limit.
293  */
294 enum {
295         RPCRDMA_MIN_SEND_SGES = 3,
296         RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
297         RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
298 };
299 
300 struct rpcrdma_buffer;
301 struct rpcrdma_req {
302         struct list_head        rl_list;
303         struct rpc_rqst         rl_slot;
304         struct rpcrdma_rep      *rl_reply;
305         struct xdr_stream       rl_stream;
306         struct xdr_buf          rl_hdrbuf;
307         struct ib_send_wr       rl_wr;
308         struct rpcrdma_sendctx  *rl_sendctx;
309         struct rpcrdma_regbuf   *rl_rdmabuf;    /* xprt header */
310         struct rpcrdma_regbuf   *rl_sendbuf;    /* rq_snd_buf */
311         struct rpcrdma_regbuf   *rl_recvbuf;    /* rq_rcv_buf */
312 
313         struct list_head        rl_all;
314         struct kref             rl_kref;
315 
316         struct list_head        rl_free_mrs;
317         struct list_head        rl_registered;
318         struct rpcrdma_mr_seg   rl_segments[RPCRDMA_MAX_SEGS];
319 };
320 
321 static inline struct rpcrdma_req *
322 rpcr_to_rdmar(const struct rpc_rqst *rqst)
323 {
324         return container_of(rqst, struct rpcrdma_req, rl_slot);
325 }
326 
327 static inline void
328 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list)
329 {
330         list_add(&mr->mr_list, list);
331 }
332 
333 static inline struct rpcrdma_mr *
334 rpcrdma_mr_pop(struct list_head *list)
335 {
336         struct rpcrdma_mr *mr;
337 
338         mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list);
339         if (mr)
340                 list_del_init(&mr->mr_list);
341         return mr;
342 }
343 
344 /*
345  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
346  * inline requests/replies, and client/server credits.
347  *
348  * One of these is associated with a transport instance
349  */
350 struct rpcrdma_buffer {
351         spinlock_t              rb_lock;
352         struct list_head        rb_send_bufs;
353         struct list_head        rb_mrs;
354 
355         unsigned long           rb_sc_head;
356         unsigned long           rb_sc_tail;
357         unsigned long           rb_sc_last;
358         struct rpcrdma_sendctx  **rb_sc_ctxs;
359 
360         struct list_head        rb_allreqs;
361         struct list_head        rb_all_mrs;
362         struct list_head        rb_all_reps;
363 
364         struct llist_head       rb_free_reps;
365 
366         __be32                  rb_max_requests;
367         u32                     rb_credits;     /* most recent credit grant */
368 
369         u32                     rb_bc_srv_max_requests;
370         u32                     rb_bc_max_requests;
371 
372         struct work_struct      rb_refresh_worker;
373 };
374 
375 /*
376  * Statistics for RPCRDMA
377  */
378 struct rpcrdma_stats {
379         /* accessed when sending a call */
380         unsigned long           read_chunk_count;
381         unsigned long           write_chunk_count;
382         unsigned long           reply_chunk_count;
383         unsigned long long      total_rdma_request;
384 
385         /* rarely accessed error counters */
386         unsigned long long      pullup_copy_count;
387         unsigned long           hardway_register_count;
388         unsigned long           failed_marshal_count;
389         unsigned long           bad_reply_count;
390         unsigned long           mrs_recycled;
391         unsigned long           mrs_orphaned;
392         unsigned long           mrs_allocated;
393         unsigned long           empty_sendctx_q;
394 
395         /* accessed when receiving a reply */
396         unsigned long long      total_rdma_reply;
397         unsigned long long      fixup_copy_count;
398         unsigned long           reply_waits_for_send;
399         unsigned long           local_inv_needed;
400         unsigned long           nomsg_call_count;
401         unsigned long           bcall_count;
402 };
403 
404 /*
405  * RPCRDMA transport -- encapsulates the structures above for
406  * integration with RPC.
407  *
408  * The contained structures are embedded, not pointers,
409  * for convenience. This structure need not be visible externally.
410  *
411  * It is allocated and initialized during mount, and released
412  * during unmount.
413  */
414 struct rpcrdma_xprt {
415         struct rpc_xprt         rx_xprt;
416         struct rpcrdma_ep       *rx_ep;
417         struct rpcrdma_buffer   rx_buf;
418         struct delayed_work     rx_connect_worker;
419         struct rpc_timeout      rx_timeout;
420         struct rpcrdma_stats    rx_stats;
421 };
422 
423 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
424 
425 static inline const char *
426 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt)
427 {
428         return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR];
429 }
430 
431 static inline const char *
432 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt)
433 {
434         return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT];
435 }
436 
437 /* Setting this to 0 ensures interoperability with early servers.
438  * Setting this to 1 enhances certain unaligned read/write performance.
439  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
440 extern int xprt_rdma_pad_optimize;
441 
442 /* This setting controls the hunt for a supported memory
443  * registration strategy.
444  */
445 extern unsigned int xprt_rdma_memreg_strategy;
446 
447 /*
448  * Endpoint calls - xprtrdma/verbs.c
449  */
450 void rpcrdma_flush_disconnect(struct rpcrdma_xprt *r_xprt, struct ib_wc *wc);
451 int rpcrdma_xprt_connect(struct rpcrdma_xprt *r_xprt);
452 void rpcrdma_xprt_disconnect(struct rpcrdma_xprt *r_xprt);
453 
454 int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
455 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
456 
457 /*
458  * Buffer calls - xprtrdma/verbs.c
459  */
460 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
461                                        gfp_t flags);
462 int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
463 void rpcrdma_req_destroy(struct rpcrdma_req *req);
464 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
465 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
466 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
467 
468 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
469 void rpcrdma_mr_put(struct rpcrdma_mr *mr);
470 void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt);
471 
472 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
473 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers,
474                         struct rpcrdma_req *req);
475 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
476 
477 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size,
478                             gfp_t flags);
479 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
480                               struct rpcrdma_regbuf *rb);
481 
482 /**
483  * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped
484  *
485  * Returns true if the buffer is now mapped to rb->rg_device.
486  */
487 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
488 {
489         return rb->rg_device != NULL;
490 }
491 
492 /**
493  * rpcrdma_regbuf_dma_map - DMA-map a regbuf
494  * @r_xprt: controlling transport instance
495  * @rb: regbuf to be mapped
496  *
497  * Returns true if the buffer is currently DMA mapped.
498  */
499 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
500                                           struct rpcrdma_regbuf *rb)
501 {
502         if (likely(rpcrdma_regbuf_is_mapped(rb)))
503                 return true;
504         return __rpcrdma_regbuf_dma_map(r_xprt, rb);
505 }
506 
507 /*
508  * Wrappers for chunk registration, shared by read/write chunk code.
509  */
510 
511 static inline enum dma_data_direction
512 rpcrdma_data_dir(bool writing)
513 {
514         return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
515 }
516 
517 /* Memory registration calls xprtrdma/frwr_ops.c
518  */
519 void frwr_reset(struct rpcrdma_req *req);
520 int frwr_query_device(struct rpcrdma_ep *ep, const struct ib_device *device);
521 int frwr_mr_init(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr *mr);
522 void frwr_release_mr(struct rpcrdma_mr *mr);
523 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
524                                 struct rpcrdma_mr_seg *seg,
525                                 int nsegs, bool writing, __be32 xid,
526                                 struct rpcrdma_mr *mr);
527 int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
528 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
529 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
530 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
531 
532 /*
533  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
534  */
535 
536 enum rpcrdma_chunktype {
537         rpcrdma_noch = 0,
538         rpcrdma_noch_pullup,
539         rpcrdma_noch_mapped,
540         rpcrdma_readch,
541         rpcrdma_areadch,
542         rpcrdma_writech,
543         rpcrdma_replych
544 };
545 
546 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
547                               struct rpcrdma_req *req, u32 hdrlen,
548                               struct xdr_buf *xdr,
549                               enum rpcrdma_chunktype rtype);
550 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc);
551 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
552 void rpcrdma_set_max_header_sizes(struct rpcrdma_ep *ep);
553 void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt);
554 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
555 void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
556 
557 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
558 {
559         xdr->head[0].iov_len = len;
560         xdr->len = len;
561 }
562 
563 /* RPC/RDMA module init - xprtrdma/transport.c
564  */
565 extern unsigned int xprt_rdma_max_inline_read;
566 extern unsigned int xprt_rdma_max_inline_write;
567 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
568 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
569 void xprt_rdma_close(struct rpc_xprt *xprt);
570 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
571 int xprt_rdma_init(void);
572 void xprt_rdma_cleanup(void);
573 
574 /* Backchannel calls - xprtrdma/backchannel.c
575  */
576 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
577 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
578 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
579 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *);
580 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
581 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
582 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst);
583 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
584 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
585 #endif  /* CONFIG_SUNRPC_BACKCHANNEL */
586 
587 extern struct xprt_class xprt_rdma_bc;
588 
589 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
590 

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