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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         rwlock_t                ri_qplock;
 69         struct ib_device        *ri_device;
 70         struct rdma_cm_id       *ri_id;
 71         struct ib_pd            *ri_pd;
 72         struct ib_mr            *ri_dma_mr;
 73         struct completion       ri_done;
 74         int                     ri_async_rc;
 75         unsigned int            ri_max_frmr_depth;
 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 /*
148  * struct rpcrdma_rep -- this structure encapsulates state required to recv
149  * and complete a reply, asychronously. It needs several pieces of
150  * state:
151  *   o recv buffer (posted to provider)
152  *   o ib_sge (also donated to provider)
153  *   o status of reply (length, success or not)
154  *   o bookkeeping state to get run by tasklet (list, etc)
155  *
156  * These are allocated during initialization, per-transport instance;
157  * however, the tasklet execution list itself is global, as it should
158  * always be pretty short.
159  *
160  * N of these are associated with a transport instance, and stored in
161  * struct rpcrdma_buffer. N is the max number of outstanding requests.
162  */
163 
164 #define RPCRDMA_MAX_DATA_SEGS   ((1 * 1024 * 1024) / PAGE_SIZE)
165 #define RPCRDMA_MAX_SEGS        (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
166 
167 struct rpcrdma_buffer;
168 
169 struct rpcrdma_rep {
170         struct ib_cqe           rr_cqe;
171         unsigned int            rr_len;
172         struct ib_device        *rr_device;
173         struct rpcrdma_xprt     *rr_rxprt;
174         struct work_struct      rr_work;
175         struct list_head        rr_list;
176         struct rpcrdma_regbuf   *rr_rdmabuf;
177 };
178 
179 #define RPCRDMA_BAD_LEN         (~0U)
180 
181 /*
182  * struct rpcrdma_mw - external memory region metadata
183  *
184  * An external memory region is any buffer or page that is registered
185  * on the fly (ie, not pre-registered).
186  *
187  * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
188  * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
189  * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
190  * track of registration metadata while each RPC is pending.
191  * rpcrdma_deregister_external() uses this metadata to unmap and
192  * release these resources when an RPC is complete.
193  */
194 enum rpcrdma_frmr_state {
195         FRMR_IS_INVALID,        /* ready to be used */
196         FRMR_IS_VALID,          /* in use */
197         FRMR_IS_STALE,          /* failed completion */
198 };
199 
200 struct rpcrdma_frmr {
201         struct scatterlist              *sg;
202         int                             sg_nents;
203         struct ib_mr                    *fr_mr;
204         struct ib_cqe                   fr_cqe;
205         enum rpcrdma_frmr_state         fr_state;
206         struct completion               fr_linv_done;
207         struct work_struct              fr_work;
208         struct rpcrdma_xprt             *fr_xprt;
209         union {
210                 struct ib_reg_wr        fr_regwr;
211                 struct ib_send_wr       fr_invwr;
212         };
213 };
214 
215 struct rpcrdma_fmr {
216         struct ib_fmr           *fmr;
217         u64                     *physaddrs;
218 };
219 
220 struct rpcrdma_mw {
221         union {
222                 struct rpcrdma_fmr      fmr;
223                 struct rpcrdma_frmr     frmr;
224         };
225         struct list_head        mw_list;
226         struct list_head        mw_all;
227 };
228 
229 /*
230  * struct rpcrdma_req -- structure central to the request/reply sequence.
231  *
232  * N of these are associated with a transport instance, and stored in
233  * struct rpcrdma_buffer. N is the max number of outstanding requests.
234  *
235  * It includes pre-registered buffer memory for send AND recv.
236  * The recv buffer, however, is not owned by this structure, and
237  * is "donated" to the hardware when a recv is posted. When a
238  * reply is handled, the recv buffer used is given back to the
239  * struct rpcrdma_req associated with the request.
240  *
241  * In addition to the basic memory, this structure includes an array
242  * of iovs for send operations. The reason is that the iovs passed to
243  * ib_post_{send,recv} must not be modified until the work request
244  * completes.
245  *
246  * NOTES:
247  *   o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we
248  *     marshal. The number needed varies depending on the iov lists that
249  *     are passed to us, the memory registration mode we are in, and if
250  *     physical addressing is used, the layout.
251  */
252 
253 struct rpcrdma_mr_seg {         /* chunk descriptors */
254         struct rpcrdma_mw *rl_mw;       /* registered MR */
255         u64             mr_base;        /* registration result */
256         u32             mr_rkey;        /* registration result */
257         u32             mr_len;         /* length of chunk or segment */
258         int             mr_nsegs;       /* number of segments in chunk or 0 */
259         enum dma_data_direction mr_dir; /* segment mapping direction */
260         dma_addr_t      mr_dma;         /* segment mapping address */
261         size_t          mr_dmalen;      /* segment mapping length */
262         struct page     *mr_page;       /* owning page, if any */
263         char            *mr_offset;     /* kva if no page, else offset */
264 };
265 
266 #define RPCRDMA_MAX_IOVS        (2)
267 
268 struct rpcrdma_req {
269         struct list_head        rl_free;
270         unsigned int            rl_niovs;
271         unsigned int            rl_nchunks;
272         unsigned int            rl_connect_cookie;
273         struct rpcrdma_buffer   *rl_buffer;
274         struct rpcrdma_rep      *rl_reply;/* holder for reply buffer */
275         struct ib_sge           rl_send_iov[RPCRDMA_MAX_IOVS];
276         struct rpcrdma_regbuf   *rl_rdmabuf;
277         struct rpcrdma_regbuf   *rl_sendbuf;
278         struct rpcrdma_mr_seg   rl_segments[RPCRDMA_MAX_SEGS];
279 
280         struct ib_cqe           rl_cqe;
281         struct list_head        rl_all;
282         bool                    rl_backchannel;
283 };
284 
285 static inline struct rpcrdma_req *
286 rpcr_to_rdmar(struct rpc_rqst *rqst)
287 {
288         void *buffer = rqst->rq_buffer;
289         struct rpcrdma_regbuf *rb;
290 
291         rb = container_of(buffer, struct rpcrdma_regbuf, rg_base);
292         return rb->rg_owner;
293 }
294 
295 /*
296  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
297  * inline requests/replies, and client/server credits.
298  *
299  * One of these is associated with a transport instance
300  */
301 struct rpcrdma_buffer {
302         spinlock_t              rb_mwlock;      /* protect rb_mws list */
303         struct list_head        rb_mws;
304         struct list_head        rb_all;
305         char                    *rb_pool;
306 
307         spinlock_t              rb_lock;        /* protect buf lists */
308         struct list_head        rb_send_bufs;
309         struct list_head        rb_recv_bufs;
310         u32                     rb_max_requests;
311         atomic_t                rb_credits;     /* most recent credit grant */
312 
313         u32                     rb_bc_srv_max_requests;
314         spinlock_t              rb_reqslock;    /* protect rb_allreqs */
315         struct list_head        rb_allreqs;
316 
317         u32                     rb_bc_max_requests;
318 };
319 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
320 
321 /*
322  * Internal structure for transport instance creation. This
323  * exists primarily for modularity.
324  *
325  * This data should be set with mount options
326  */
327 struct rpcrdma_create_data_internal {
328         struct sockaddr_storage addr;   /* RDMA server address */
329         unsigned int    max_requests;   /* max requests (slots) in flight */
330         unsigned int    rsize;          /* mount rsize - max read hdr+data */
331         unsigned int    wsize;          /* mount wsize - max write hdr+data */
332         unsigned int    inline_rsize;   /* max non-rdma read data payload */
333         unsigned int    inline_wsize;   /* max non-rdma write data payload */
334         unsigned int    padding;        /* non-rdma write header padding */
335 };
336 
337 #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
338         (rpcx_to_rdmad(rq->rq_xprt).inline_rsize)
339 
340 #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
341         (rpcx_to_rdmad(rq->rq_xprt).inline_wsize)
342 
343 #define RPCRDMA_INLINE_PAD_VALUE(rq)\
344         rpcx_to_rdmad(rq->rq_xprt).padding
345 
346 /*
347  * Statistics for RPCRDMA
348  */
349 struct rpcrdma_stats {
350         unsigned long           read_chunk_count;
351         unsigned long           write_chunk_count;
352         unsigned long           reply_chunk_count;
353 
354         unsigned long long      total_rdma_request;
355         unsigned long long      total_rdma_reply;
356 
357         unsigned long long      pullup_copy_count;
358         unsigned long long      fixup_copy_count;
359         unsigned long           hardway_register_count;
360         unsigned long           failed_marshal_count;
361         unsigned long           bad_reply_count;
362         unsigned long           nomsg_call_count;
363         unsigned long           bcall_count;
364 };
365 
366 /*
367  * Per-registration mode operations
368  */
369 struct rpcrdma_xprt;
370 struct rpcrdma_memreg_ops {
371         int             (*ro_map)(struct rpcrdma_xprt *,
372                                   struct rpcrdma_mr_seg *, int, bool);
373         void            (*ro_unmap_sync)(struct rpcrdma_xprt *,
374                                          struct rpcrdma_req *);
375         int             (*ro_unmap)(struct rpcrdma_xprt *,
376                                     struct rpcrdma_mr_seg *);
377         int             (*ro_open)(struct rpcrdma_ia *,
378                                    struct rpcrdma_ep *,
379                                    struct rpcrdma_create_data_internal *);
380         size_t          (*ro_maxpages)(struct rpcrdma_xprt *);
381         int             (*ro_init)(struct rpcrdma_xprt *);
382         void            (*ro_destroy)(struct rpcrdma_buffer *);
383         const char      *ro_displayname;
384 };
385 
386 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
387 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
388 extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops;
389 
390 /*
391  * RPCRDMA transport -- encapsulates the structures above for
392  * integration with RPC.
393  *
394  * The contained structures are embedded, not pointers,
395  * for convenience. This structure need not be visible externally.
396  *
397  * It is allocated and initialized during mount, and released
398  * during unmount.
399  */
400 struct rpcrdma_xprt {
401         struct rpc_xprt         rx_xprt;
402         struct rpcrdma_ia       rx_ia;
403         struct rpcrdma_ep       rx_ep;
404         struct rpcrdma_buffer   rx_buf;
405         struct rpcrdma_create_data_internal rx_data;
406         struct delayed_work     rx_connect_worker;
407         struct rpcrdma_stats    rx_stats;
408 };
409 
410 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
411 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
412 
413 /* Setting this to 0 ensures interoperability with early servers.
414  * Setting this to 1 enhances certain unaligned read/write performance.
415  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
416 extern int xprt_rdma_pad_optimize;
417 
418 /*
419  * Interface Adapter calls - xprtrdma/verbs.c
420  */
421 int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
422 void rpcrdma_ia_close(struct rpcrdma_ia *);
423 
424 /*
425  * Endpoint calls - xprtrdma/verbs.c
426  */
427 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
428                                 struct rpcrdma_create_data_internal *);
429 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
430 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
431 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
432 
433 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
434                                 struct rpcrdma_req *);
435 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
436                                 struct rpcrdma_rep *);
437 
438 /*
439  * Buffer calls - xprtrdma/verbs.c
440  */
441 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
442 struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *);
443 void rpcrdma_destroy_req(struct rpcrdma_ia *, struct rpcrdma_req *);
444 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
445 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
446 
447 struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *);
448 void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *);
449 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
450 void rpcrdma_buffer_put(struct rpcrdma_req *);
451 void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
452 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
453 
454 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *,
455                                             size_t, gfp_t);
456 void rpcrdma_free_regbuf(struct rpcrdma_ia *,
457                          struct rpcrdma_regbuf *);
458 
459 unsigned int rpcrdma_max_segments(struct rpcrdma_xprt *);
460 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
461 
462 int frwr_alloc_recovery_wq(void);
463 void frwr_destroy_recovery_wq(void);
464 
465 int rpcrdma_alloc_wq(void);
466 void rpcrdma_destroy_wq(void);
467 
468 /*
469  * Wrappers for chunk registration, shared by read/write chunk code.
470  */
471 
472 void rpcrdma_mapping_error(struct rpcrdma_mr_seg *);
473 
474 static inline enum dma_data_direction
475 rpcrdma_data_dir(bool writing)
476 {
477         return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
478 }
479 
480 static inline void
481 rpcrdma_map_one(struct ib_device *device, struct rpcrdma_mr_seg *seg,
482                 enum dma_data_direction direction)
483 {
484         seg->mr_dir = direction;
485         seg->mr_dmalen = seg->mr_len;
486 
487         if (seg->mr_page)
488                 seg->mr_dma = ib_dma_map_page(device,
489                                 seg->mr_page, offset_in_page(seg->mr_offset),
490                                 seg->mr_dmalen, seg->mr_dir);
491         else
492                 seg->mr_dma = ib_dma_map_single(device,
493                                 seg->mr_offset,
494                                 seg->mr_dmalen, seg->mr_dir);
495 
496         if (ib_dma_mapping_error(device, seg->mr_dma))
497                 rpcrdma_mapping_error(seg);
498 }
499 
500 static inline void
501 rpcrdma_unmap_one(struct ib_device *device, struct rpcrdma_mr_seg *seg)
502 {
503         if (seg->mr_page)
504                 ib_dma_unmap_page(device,
505                                   seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
506         else
507                 ib_dma_unmap_single(device,
508                                     seg->mr_dma, seg->mr_dmalen, seg->mr_dir);
509 }
510 
511 /*
512  * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
513  */
514 void rpcrdma_connect_worker(struct work_struct *);
515 void rpcrdma_conn_func(struct rpcrdma_ep *);
516 void rpcrdma_reply_handler(struct rpcrdma_rep *);
517 
518 /*
519  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
520  */
521 int rpcrdma_marshal_req(struct rpc_rqst *);
522 
523 /* RPC/RDMA module init - xprtrdma/transport.c
524  */
525 extern unsigned int xprt_rdma_max_inline_read;
526 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
527 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
528 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
529 int xprt_rdma_init(void);
530 void xprt_rdma_cleanup(void);
531 
532 /* Backchannel calls - xprtrdma/backchannel.c
533  */
534 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
535 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
536 int xprt_rdma_bc_up(struct svc_serv *, struct net *);
537 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
538 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
539 int rpcrdma_bc_marshal_reply(struct rpc_rqst *);
540 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
541 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
542 #endif  /* CONFIG_SUNRPC_BACKCHANNEL */
543 
544 extern struct xprt_class xprt_rdma_bc;
545 
546 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
547 

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