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

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  1 /*
  2  * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
  3  *
  4  * This software is available to you under a choice of one of two
  5  * licenses.  You may choose to be licensed under the terms of the GNU
  6  * General Public License (GPL) Version 2, available from the file
  7  * COPYING in the main directory of this source tree, or the BSD-type
  8  * license below:
  9  *
 10  * Redistribution and use in source and binary forms, with or without
 11  * modification, are permitted provided that the following conditions
 12  * are met:
 13  *
 14  *      Redistributions of source code must retain the above copyright
 15  *      notice, this list of conditions and the following disclaimer.
 16  *
 17  *      Redistributions in binary form must reproduce the above
 18  *      copyright notice, this list of conditions and the following
 19  *      disclaimer in the documentation and/or other materials provided
 20  *      with the distribution.
 21  *
 22  *      Neither the name of the Network Appliance, Inc. nor the names of
 23  *      its contributors may be used to endorse or promote products
 24  *      derived from this software without specific prior written
 25  *      permission.
 26  *
 27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 28  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 30  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 31  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 32  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 33  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 37  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 38  */
 39 
 40 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H
 41 #define _LINUX_SUNRPC_XPRT_RDMA_H
 42 
 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 */
 47 
 48 #include <rdma/rdma_cm.h>               /* RDMA connection api */
 49 #include <rdma/ib_verbs.h>              /* RDMA verbs api */
 50 
 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 */
 54 
 55 #define RDMA_RESOLVE_TIMEOUT    (5000)  /* 5 seconds */
 56 #define RDMA_CONNECT_RETRY_MAX  (2)     /* retries if no listener backlog */
 57 
 58 #define RPCRDMA_BIND_TO         (60U * HZ)
 59 #define RPCRDMA_INIT_REEST_TO   (5U * HZ)
 60 #define RPCRDMA_MAX_REEST_TO    (30U * HZ)
 61 #define RPCRDMA_IDLE_DISC_TO    (5U * 60 * HZ)
 62 
 63 /*
 64  * Interface Adapter -- one per transport instance
 65  */
 66 struct rpcrdma_ia {
 67         const struct rpcrdma_memreg_ops *ri_ops;
 68         struct ib_device        *ri_device;
 69         struct rdma_cm_id       *ri_id;
 70         struct ib_pd            *ri_pd;
 71         struct completion       ri_done;
 72         int                     ri_async_rc;
 73         unsigned int            ri_max_frmr_depth;
 74         unsigned int            ri_max_inline_write;
 75         unsigned int            ri_max_inline_read;
 76         struct ib_qp_attr       ri_qp_attr;
 77         struct ib_qp_init_attr  ri_qp_init_attr;
 78 };
 79 
 80 /*
 81  * RDMA Endpoint -- one per transport instance
 82  */
 83 
 84 struct rpcrdma_ep {
 85         atomic_t                rep_cqcount;
 86         int                     rep_cqinit;
 87         int                     rep_connected;
 88         struct ib_qp_init_attr  rep_attr;
 89         wait_queue_head_t       rep_connect_wait;
 90         struct rdma_conn_param  rep_remote_cma;
 91         struct sockaddr_storage rep_remote_addr;
 92         struct delayed_work     rep_connect_worker;
 93 };
 94 
 95 #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
 96 #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
 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.
101  */
102 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
103 #define RPCRDMA_BACKWARD_WRS            (8)
104 #else
105 #define RPCRDMA_BACKWARD_WRS            (0)
106 #endif
107 
108 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
109  *
110  * The below structure appears at the front of a large region of kmalloc'd
111  * memory, which always starts on a good alignment boundary.
112  */
113 
114 struct rpcrdma_regbuf {
115         size_t                  rg_size;
116         struct rpcrdma_req      *rg_owner;
117         struct ib_sge           rg_iov;
118         __be32                  rg_base[0] __attribute__ ((aligned(256)));
119 };
120 
121 static inline u64
122 rdmab_addr(struct rpcrdma_regbuf *rb)
123 {
124         return rb->rg_iov.addr;
125 }
126 
127 static inline u32
128 rdmab_length(struct rpcrdma_regbuf *rb)
129 {
130         return rb->rg_iov.length;
131 }
132 
133 static inline u32
134 rdmab_lkey(struct rpcrdma_regbuf *rb)
135 {
136         return rb->rg_iov.lkey;
137 }
138 
139 static inline struct rpcrdma_msg *
140 rdmab_to_msg(struct rpcrdma_regbuf *rb)
141 {
142         return (struct rpcrdma_msg *)rb->rg_base;
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 8. This prevents less-capable devices and
150  * memory registrations from overrunning the Send buffer
151  * while building chunk lists.
152  *
153  * Elements of the Read list take up more room than the
154  * Write list or Reply chunk. 8 read segments means the Read
155  * list (or Write list or Reply chunk) cannot consume more
156  * than
157  *
158  * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes.
159  *
160  * And the fixed part of the header is another 24 bytes.
161  *
162  * The smallest inline threshold is 1024 bytes, ensuring that
163  * at least 750 bytes are available for RPC messages.
164  */
165 #define RPCRDMA_MAX_HDR_SEGS    (8)
166 
167 /*
168  * struct rpcrdma_rep -- this structure encapsulates state required to recv
169  * and complete a reply, asychronously. It needs several pieces of
170  * state:
171  *   o recv buffer (posted to provider)
172  *   o ib_sge (also donated to provider)
173  *   o status of reply (length, success or not)
174  *   o bookkeeping state to get run by reply handler (list, etc)
175  *
176  * These are allocated during initialization, per-transport instance.
177  *
178  * N of these are associated with a transport instance, and stored in
179  * struct rpcrdma_buffer. N is the max number of outstanding requests.
180  */
181 
182 struct rpcrdma_rep {
183         struct ib_cqe           rr_cqe;
184         unsigned int            rr_len;
185         struct ib_device        *rr_device;
186         struct rpcrdma_xprt     *rr_rxprt;
187         struct work_struct      rr_work;
188         struct list_head        rr_list;
189         struct rpcrdma_regbuf   *rr_rdmabuf;
190 };
191 
192 #define RPCRDMA_BAD_LEN         (~0U)
193 
194 /*
195  * struct rpcrdma_mw - external memory region metadata
196  *
197  * An external memory region is any buffer or page that is registered
198  * on the fly (ie, not pre-registered).
199  *
200  * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
201  * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
202  * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
203  * track of registration metadata while each RPC is pending.
204  * rpcrdma_deregister_external() uses this metadata to unmap and
205  * release these resources when an RPC is complete.
206  */
207 enum rpcrdma_frmr_state {
208         FRMR_IS_INVALID,        /* ready to be used */
209         FRMR_IS_VALID,          /* in use */
210         FRMR_FLUSHED_FR,        /* flushed FASTREG WR */
211         FRMR_FLUSHED_LI,        /* flushed LOCALINV WR */
212 };
213 
214 struct rpcrdma_frmr {
215         struct ib_mr                    *fr_mr;
216         struct ib_cqe                   fr_cqe;
217         enum rpcrdma_frmr_state         fr_state;
218         struct completion               fr_linv_done;
219         union {
220                 struct ib_reg_wr        fr_regwr;
221                 struct ib_send_wr       fr_invwr;
222         };
223 };
224 
225 struct rpcrdma_fmr {
226         struct ib_fmr           *fm_mr;
227         u64                     *fm_physaddrs;
228 };
229 
230 struct rpcrdma_mw {
231         struct list_head        mw_list;
232         struct scatterlist      *mw_sg;
233         int                     mw_nents;
234         enum dma_data_direction mw_dir;
235         union {
236                 struct rpcrdma_fmr      fmr;
237                 struct rpcrdma_frmr     frmr;
238         };
239         struct rpcrdma_xprt     *mw_xprt;
240         u32                     mw_handle;
241         u32                     mw_length;
242         u64                     mw_offset;
243         struct list_head        mw_all;
244 };
245 
246 /*
247  * struct rpcrdma_req -- structure central to the request/reply sequence.
248  *
249  * N of these are associated with a transport instance, and stored in
250  * struct rpcrdma_buffer. N is the max number of outstanding requests.
251  *
252  * It includes pre-registered buffer memory for send AND recv.
253  * The recv buffer, however, is not owned by this structure, and
254  * is "donated" to the hardware when a recv is posted. When a
255  * reply is handled, the recv buffer used is given back to the
256  * struct rpcrdma_req associated with the request.
257  *
258  * In addition to the basic memory, this structure includes an array
259  * of iovs for send operations. The reason is that the iovs passed to
260  * ib_post_{send,recv} must not be modified until the work request
261  * completes.
262  */
263 
264 /* Maximum number of page-sized "segments" per chunk list to be
265  * registered or invalidated. Must handle a Reply chunk:
266  */
267 enum {
268         RPCRDMA_MAX_IOV_SEGS    = 3,
269         RPCRDMA_MAX_DATA_SEGS   = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
270         RPCRDMA_MAX_SEGS        = RPCRDMA_MAX_DATA_SEGS +
271                                   RPCRDMA_MAX_IOV_SEGS,
272 };
273 
274 struct rpcrdma_mr_seg {         /* chunk descriptors */
275         u32             mr_len;         /* length of chunk or segment */
276         struct page     *mr_page;       /* owning page, if any */
277         char            *mr_offset;     /* kva if no page, else offset */
278 };
279 
280 #define RPCRDMA_MAX_IOVS        (2)
281 
282 struct rpcrdma_buffer;
283 struct rpcrdma_req {
284         struct list_head        rl_free;
285         unsigned int            rl_niovs;
286         unsigned int            rl_connect_cookie;
287         struct rpc_task         *rl_task;
288         struct rpcrdma_buffer   *rl_buffer;
289         struct rpcrdma_rep      *rl_reply;/* holder for reply buffer */
290         struct ib_sge           rl_send_iov[RPCRDMA_MAX_IOVS];
291         struct rpcrdma_regbuf   *rl_rdmabuf;
292         struct rpcrdma_regbuf   *rl_sendbuf;
293 
294         struct ib_cqe           rl_cqe;
295         struct list_head        rl_all;
296         bool                    rl_backchannel;
297 
298         struct list_head        rl_registered;  /* registered segments */
299         struct rpcrdma_mr_seg   rl_segments[RPCRDMA_MAX_SEGS];
300 };
301 
302 static inline struct rpcrdma_req *
303 rpcr_to_rdmar(struct rpc_rqst *rqst)
304 {
305         void *buffer = rqst->rq_buffer;
306         struct rpcrdma_regbuf *rb;
307 
308         rb = container_of(buffer, struct rpcrdma_regbuf, rg_base);
309         return rb->rg_owner;
310 }
311 
312 /*
313  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
314  * inline requests/replies, and client/server credits.
315  *
316  * One of these is associated with a transport instance
317  */
318 struct rpcrdma_buffer {
319         spinlock_t              rb_mwlock;      /* protect rb_mws list */
320         struct list_head        rb_mws;
321         struct list_head        rb_all;
322         char                    *rb_pool;
323 
324         spinlock_t              rb_lock;        /* protect buf lists */
325         int                     rb_send_count, rb_recv_count;
326         struct list_head        rb_send_bufs;
327         struct list_head        rb_recv_bufs;
328         u32                     rb_max_requests;
329         atomic_t                rb_credits;     /* most recent credit grant */
330 
331         u32                     rb_bc_srv_max_requests;
332         spinlock_t              rb_reqslock;    /* protect rb_allreqs */
333         struct list_head        rb_allreqs;
334 
335         u32                     rb_bc_max_requests;
336 
337         spinlock_t              rb_recovery_lock; /* protect rb_stale_mrs */
338         struct list_head        rb_stale_mrs;
339         struct delayed_work     rb_recovery_worker;
340         struct delayed_work     rb_refresh_worker;
341 };
342 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
343 
344 /*
345  * Internal structure for transport instance creation. This
346  * exists primarily for modularity.
347  *
348  * This data should be set with mount options
349  */
350 struct rpcrdma_create_data_internal {
351         struct sockaddr_storage addr;   /* RDMA server address */
352         unsigned int    max_requests;   /* max requests (slots) in flight */
353         unsigned int    rsize;          /* mount rsize - max read hdr+data */
354         unsigned int    wsize;          /* mount wsize - max write hdr+data */
355         unsigned int    inline_rsize;   /* max non-rdma read data payload */
356         unsigned int    inline_wsize;   /* max non-rdma write data payload */
357         unsigned int    padding;        /* non-rdma write header padding */
358 };
359 
360 #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
361         (rpcx_to_rdmad(rq->rq_xprt).inline_rsize)
362 
363 #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
364         (rpcx_to_rdmad(rq->rq_xprt).inline_wsize)
365 
366 #define RPCRDMA_INLINE_PAD_VALUE(rq)\
367         rpcx_to_rdmad(rq->rq_xprt).padding
368 
369 /*
370  * Statistics for RPCRDMA
371  */
372 struct rpcrdma_stats {
373         unsigned long           read_chunk_count;
374         unsigned long           write_chunk_count;
375         unsigned long           reply_chunk_count;
376 
377         unsigned long long      total_rdma_request;
378         unsigned long long      total_rdma_reply;
379 
380         unsigned long long      pullup_copy_count;
381         unsigned long long      fixup_copy_count;
382         unsigned long           hardway_register_count;
383         unsigned long           failed_marshal_count;
384         unsigned long           bad_reply_count;
385         unsigned long           nomsg_call_count;
386         unsigned long           bcall_count;
387         unsigned long           mrs_recovered;
388         unsigned long           mrs_orphaned;
389         unsigned long           mrs_allocated;
390 };
391 
392 /*
393  * Per-registration mode operations
394  */
395 struct rpcrdma_xprt;
396 struct rpcrdma_memreg_ops {
397         int             (*ro_map)(struct rpcrdma_xprt *,
398                                   struct rpcrdma_mr_seg *, int, bool,
399                                   struct rpcrdma_mw **);
400         void            (*ro_unmap_sync)(struct rpcrdma_xprt *,
401                                          struct rpcrdma_req *);
402         void            (*ro_unmap_safe)(struct rpcrdma_xprt *,
403                                          struct rpcrdma_req *, bool);
404         void            (*ro_recover_mr)(struct rpcrdma_mw *);
405         int             (*ro_open)(struct rpcrdma_ia *,
406                                    struct rpcrdma_ep *,
407                                    struct rpcrdma_create_data_internal *);
408         size_t          (*ro_maxpages)(struct rpcrdma_xprt *);
409         int             (*ro_init_mr)(struct rpcrdma_ia *,
410                                       struct rpcrdma_mw *);
411         void            (*ro_release_mr)(struct rpcrdma_mw *);
412         const char      *ro_displayname;
413 };
414 
415 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
416 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
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 rpcrdma_create_data_internal rx_data;
434         struct delayed_work     rx_connect_worker;
435         struct rpcrdma_stats    rx_stats;
436 };
437 
438 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
439 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
440 
441 /* Setting this to 0 ensures interoperability with early servers.
442  * Setting this to 1 enhances certain unaligned read/write performance.
443  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
444 extern int xprt_rdma_pad_optimize;
445 
446 /*
447  * Interface Adapter calls - xprtrdma/verbs.c
448  */
449 int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
450 void rpcrdma_ia_close(struct rpcrdma_ia *);
451 bool frwr_is_supported(struct rpcrdma_ia *);
452 bool fmr_is_supported(struct rpcrdma_ia *);
453 
454 /*
455  * Endpoint calls - xprtrdma/verbs.c
456  */
457 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
458                                 struct rpcrdma_create_data_internal *);
459 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
460 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
461 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
462 
463 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
464                                 struct rpcrdma_req *);
465 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
466                                 struct rpcrdma_rep *);
467 
468 /*
469  * Buffer calls - xprtrdma/verbs.c
470  */
471 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
472 struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *);
473 void rpcrdma_destroy_req(struct rpcrdma_ia *, struct rpcrdma_req *);
474 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
475 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
476 
477 struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *);
478 void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *);
479 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
480 void rpcrdma_buffer_put(struct rpcrdma_req *);
481 void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
482 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
483 
484 void rpcrdma_defer_mr_recovery(struct rpcrdma_mw *);
485 
486 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *,
487                                             size_t, gfp_t);
488 void rpcrdma_free_regbuf(struct rpcrdma_ia *,
489                          struct rpcrdma_regbuf *);
490 
491 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
492 
493 int rpcrdma_alloc_wq(void);
494 void rpcrdma_destroy_wq(void);
495 
496 /*
497  * Wrappers for chunk registration, shared by read/write chunk code.
498  */
499 
500 static inline enum dma_data_direction
501 rpcrdma_data_dir(bool writing)
502 {
503         return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
504 }
505 
506 /*
507  * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
508  */
509 void rpcrdma_connect_worker(struct work_struct *);
510 void rpcrdma_conn_func(struct rpcrdma_ep *);
511 void rpcrdma_reply_handler(struct rpcrdma_rep *);
512 
513 /*
514  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
515  */
516 int rpcrdma_marshal_req(struct rpc_rqst *);
517 void rpcrdma_set_max_header_sizes(struct rpcrdma_ia *,
518                                   struct rpcrdma_create_data_internal *,
519                                   unsigned int);
520 
521 /* RPC/RDMA module init - xprtrdma/transport.c
522  */
523 extern unsigned int xprt_rdma_max_inline_read;
524 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
525 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
526 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
527 int xprt_rdma_init(void);
528 void xprt_rdma_cleanup(void);
529 
530 /* Backchannel calls - xprtrdma/backchannel.c
531  */
532 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
533 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
534 int xprt_rdma_bc_up(struct svc_serv *, struct net *);
535 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
536 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
537 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
538 int rpcrdma_bc_marshal_reply(struct rpc_rqst *);
539 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
540 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
541 #endif  /* CONFIG_SUNRPC_BACKCHANNEL */
542 
543 extern struct xprt_class xprt_rdma_bc;
544 
545 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
546 

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