~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.14-rc3 ] ~ [ linux-5.13.5 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.53 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.135 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.198 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.240 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.276 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.276 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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  * Interface Adapter -- one per transport instance
 69  */
 70 struct rpcrdma_ia {
 71         struct rdma_cm_id       *ri_id;
 72         struct ib_pd            *ri_pd;
 73         int                     ri_async_rc;
 74         unsigned int            ri_max_rdma_segs;
 75         unsigned int            ri_max_frwr_depth;
 76         bool                    ri_implicit_roundup;
 77         enum ib_mr_type         ri_mrtype;
 78         unsigned long           ri_flags;
 79         struct completion       ri_done;
 80         struct completion       ri_remove_done;
 81 };
 82 
 83 enum {
 84         RPCRDMA_IAF_REMOVING = 0,
 85 };
 86 
 87 /*
 88  * RDMA Endpoint -- one per transport instance
 89  */
 90 
 91 struct rpcrdma_ep {
 92         unsigned int            rep_send_count;
 93         unsigned int            rep_send_batch;
 94         unsigned int            rep_max_inline_send;
 95         unsigned int            rep_max_inline_recv;
 96         int                     rep_connected;
 97         struct ib_qp_init_attr  rep_attr;
 98         wait_queue_head_t       rep_connect_wait;
 99         struct rpcrdma_connect_private  rep_cm_private;
100         struct rdma_conn_param  rep_remote_cma;
101         unsigned int            rep_max_requests;       /* depends on device */
102         unsigned int            rep_inline_send;        /* negotiated */
103         unsigned int            rep_inline_recv;        /* negotiated */
104         int                     rep_receive_count;
105 };
106 
107 /* Pre-allocate extra Work Requests for handling backward receives
108  * and sends. This is a fixed value because the Work Queues are
109  * 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 
129 static inline u64 rdmab_addr(struct rpcrdma_regbuf *rb)
130 {
131         return rb->rg_iov.addr;
132 }
133 
134 static inline u32 rdmab_length(struct rpcrdma_regbuf *rb)
135 {
136         return rb->rg_iov.length;
137 }
138 
139 static inline u32 rdmab_lkey(struct rpcrdma_regbuf *rb)
140 {
141         return rb->rg_iov.lkey;
142 }
143 
144 static inline struct ib_device *rdmab_device(struct rpcrdma_regbuf *rb)
145 {
146         return rb->rg_device;
147 }
148 
149 static inline void *rdmab_data(const struct rpcrdma_regbuf *rb)
150 {
151         return rb->rg_data;
152 }
153 
154 #define RPCRDMA_DEF_GFP         (GFP_NOIO | __GFP_NOWARN)
155 
156 /* To ensure a transport can always make forward progress,
157  * the number of RDMA segments allowed in header chunk lists
158  * is capped at 16. This prevents less-capable devices from
159  * overrunning the Send buffer while building chunk lists.
160  *
161  * Elements of the Read list take up more room than the
162  * Write list or Reply chunk. 16 read segments means the
163  * chunk lists cannot consume more than
164  *
165  * ((16 + 2) * read segment size) + 1 XDR words,
166  *
167  * or about 400 bytes. The fixed part of the header is
168  * another 24 bytes. Thus when the inline threshold is
169  * 1024 bytes, at least 600 bytes are available for RPC
170  * message bodies.
171  */
172 enum {
173         RPCRDMA_MAX_HDR_SEGS = 16,
174 };
175 
176 /*
177  * struct rpcrdma_rep -- this structure encapsulates state required
178  * to receive and complete an RPC Reply, asychronously. It needs
179  * several pieces of state:
180  *
181  *   o receive buffer and ib_sge (donated to provider)
182  *   o status of receive (success or not, length, inv rkey)
183  *   o bookkeeping state to get run by reply handler (XDR stream)
184  *
185  * These structures are allocated during transport initialization.
186  * N of these are associated with a transport instance, managed by
187  * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
188  */
189 
190 struct rpcrdma_rep {
191         struct ib_cqe           rr_cqe;
192         __be32                  rr_xid;
193         __be32                  rr_vers;
194         __be32                  rr_proc;
195         int                     rr_wc_flags;
196         u32                     rr_inv_rkey;
197         bool                    rr_temp;
198         struct rpcrdma_regbuf   *rr_rdmabuf;
199         struct rpcrdma_xprt     *rr_rxprt;
200         struct rpc_rqst         *rr_rqst;
201         struct xdr_buf          rr_hdrbuf;
202         struct xdr_stream       rr_stream;
203         struct llist_node       rr_node;
204         struct ib_recv_wr       rr_recv_wr;
205         struct list_head        rr_all;
206 };
207 
208 /* To reduce the rate at which a transport invokes ib_post_recv
209  * (and thus the hardware doorbell rate), xprtrdma posts Receive
210  * WRs in batches.
211  *
212  * Setting this to zero disables Receive post batching.
213  */
214 enum {
215         RPCRDMA_MAX_RECV_BATCH = 7,
216 };
217 
218 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
219  */
220 struct rpcrdma_req;
221 struct rpcrdma_sendctx {
222         struct ib_cqe           sc_cqe;
223         struct rpcrdma_req      *sc_req;
224         unsigned int            sc_unmap_count;
225         struct ib_sge           sc_sges[];
226 };
227 
228 /*
229  * struct rpcrdma_mr - external memory region metadata
230  *
231  * An external memory region is any buffer or page that is registered
232  * on the fly (ie, not pre-registered).
233  */
234 struct rpcrdma_frwr {
235         struct ib_mr                    *fr_mr;
236         struct ib_cqe                   fr_cqe;
237         struct completion               fr_linv_done;
238         union {
239                 struct ib_reg_wr        fr_regwr;
240                 struct ib_send_wr       fr_invwr;
241         };
242 };
243 
244 struct rpcrdma_req;
245 struct rpcrdma_mr {
246         struct list_head        mr_list;
247         struct rpcrdma_req      *mr_req;
248         struct scatterlist      *mr_sg;
249         int                     mr_nents;
250         enum dma_data_direction mr_dir;
251         struct rpcrdma_frwr     frwr;
252         struct rpcrdma_xprt     *mr_xprt;
253         u32                     mr_handle;
254         u32                     mr_length;
255         u64                     mr_offset;
256         struct list_head        mr_all;
257 };
258 
259 /*
260  * struct rpcrdma_req -- structure central to the request/reply sequence.
261  *
262  * N of these are associated with a transport instance, and stored in
263  * struct rpcrdma_buffer. N is the max number of outstanding requests.
264  *
265  * It includes pre-registered buffer memory for send AND recv.
266  * The recv buffer, however, is not owned by this structure, and
267  * is "donated" to the hardware when a recv is posted. When a
268  * reply is handled, the recv buffer used is given back to the
269  * struct rpcrdma_req associated with the request.
270  *
271  * In addition to the basic memory, this structure includes an array
272  * of iovs for send operations. The reason is that the iovs passed to
273  * ib_post_{send,recv} must not be modified until the work request
274  * completes.
275  */
276 
277 /* Maximum number of page-sized "segments" per chunk list to be
278  * registered or invalidated. Must handle a Reply chunk:
279  */
280 enum {
281         RPCRDMA_MAX_IOV_SEGS    = 3,
282         RPCRDMA_MAX_DATA_SEGS   = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
283         RPCRDMA_MAX_SEGS        = RPCRDMA_MAX_DATA_SEGS +
284                                   RPCRDMA_MAX_IOV_SEGS,
285 };
286 
287 struct rpcrdma_mr_seg {         /* chunk descriptors */
288         u32             mr_len;         /* length of chunk or segment */
289         struct page     *mr_page;       /* owning page, if any */
290         char            *mr_offset;     /* kva if no page, else offset */
291 };
292 
293 /* The Send SGE array is provisioned to send a maximum size
294  * inline request:
295  * - RPC-over-RDMA header
296  * - xdr_buf head iovec
297  * - RPCRDMA_MAX_INLINE bytes, in pages
298  * - xdr_buf tail iovec
299  *
300  * The actual number of array elements consumed by each RPC
301  * depends on the device's max_sge limit.
302  */
303 enum {
304         RPCRDMA_MIN_SEND_SGES = 3,
305         RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
306         RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
307 };
308 
309 struct rpcrdma_buffer;
310 struct rpcrdma_req {
311         struct list_head        rl_list;
312         struct rpc_rqst         rl_slot;
313         struct rpcrdma_rep      *rl_reply;
314         struct xdr_stream       rl_stream;
315         struct xdr_buf          rl_hdrbuf;
316         struct ib_send_wr       rl_wr;
317         struct rpcrdma_sendctx  *rl_sendctx;
318         struct rpcrdma_regbuf   *rl_rdmabuf;    /* xprt header */
319         struct rpcrdma_regbuf   *rl_sendbuf;    /* rq_snd_buf */
320         struct rpcrdma_regbuf   *rl_recvbuf;    /* rq_rcv_buf */
321 
322         struct list_head        rl_all;
323         struct kref             rl_kref;
324 
325         struct list_head        rl_free_mrs;
326         struct list_head        rl_registered;
327         struct rpcrdma_mr_seg   rl_segments[RPCRDMA_MAX_SEGS];
328 };
329 
330 static inline struct rpcrdma_req *
331 rpcr_to_rdmar(const struct rpc_rqst *rqst)
332 {
333         return container_of(rqst, struct rpcrdma_req, rl_slot);
334 }
335 
336 static inline void
337 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list)
338 {
339         list_add(&mr->mr_list, list);
340 }
341 
342 static inline struct rpcrdma_mr *
343 rpcrdma_mr_pop(struct list_head *list)
344 {
345         struct rpcrdma_mr *mr;
346 
347         mr = list_first_entry_or_null(list, struct rpcrdma_mr, mr_list);
348         if (mr)
349                 list_del_init(&mr->mr_list);
350         return mr;
351 }
352 
353 /*
354  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
355  * inline requests/replies, and client/server credits.
356  *
357  * One of these is associated with a transport instance
358  */
359 struct rpcrdma_buffer {
360         spinlock_t              rb_lock;
361         struct list_head        rb_send_bufs;
362         struct list_head        rb_mrs;
363 
364         unsigned long           rb_sc_head;
365         unsigned long           rb_sc_tail;
366         unsigned long           rb_sc_last;
367         struct rpcrdma_sendctx  **rb_sc_ctxs;
368 
369         struct list_head        rb_allreqs;
370         struct list_head        rb_all_mrs;
371         struct list_head        rb_all_reps;
372 
373         struct llist_head       rb_free_reps;
374 
375         __be32                  rb_max_requests;
376         u32                     rb_credits;     /* most recent credit grant */
377 
378         u32                     rb_bc_srv_max_requests;
379         u32                     rb_bc_max_requests;
380 
381         struct work_struct      rb_refresh_worker;
382 };
383 
384 /*
385  * Statistics for RPCRDMA
386  */
387 struct rpcrdma_stats {
388         /* accessed when sending a call */
389         unsigned long           read_chunk_count;
390         unsigned long           write_chunk_count;
391         unsigned long           reply_chunk_count;
392         unsigned long long      total_rdma_request;
393 
394         /* rarely accessed error counters */
395         unsigned long long      pullup_copy_count;
396         unsigned long           hardway_register_count;
397         unsigned long           failed_marshal_count;
398         unsigned long           bad_reply_count;
399         unsigned long           mrs_recycled;
400         unsigned long           mrs_orphaned;
401         unsigned long           mrs_allocated;
402         unsigned long           empty_sendctx_q;
403 
404         /* accessed when receiving a reply */
405         unsigned long long      total_rdma_reply;
406         unsigned long long      fixup_copy_count;
407         unsigned long           reply_waits_for_send;
408         unsigned long           local_inv_needed;
409         unsigned long           nomsg_call_count;
410         unsigned long           bcall_count;
411 };
412 
413 /*
414  * RPCRDMA transport -- encapsulates the structures above for
415  * integration with RPC.
416  *
417  * The contained structures are embedded, not pointers,
418  * for convenience. This structure need not be visible externally.
419  *
420  * It is allocated and initialized during mount, and released
421  * during unmount.
422  */
423 struct rpcrdma_xprt {
424         struct rpc_xprt         rx_xprt;
425         struct rpcrdma_ia       rx_ia;
426         struct rpcrdma_ep       rx_ep;
427         struct rpcrdma_buffer   rx_buf;
428         struct delayed_work     rx_connect_worker;
429         struct rpc_timeout      rx_timeout;
430         struct rpcrdma_stats    rx_stats;
431 };
432 
433 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
434 
435 static inline const char *
436 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt)
437 {
438         return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR];
439 }
440 
441 static inline const char *
442 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt)
443 {
444         return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT];
445 }
446 
447 /* Setting this to 0 ensures interoperability with early servers.
448  * Setting this to 1 enhances certain unaligned read/write performance.
449  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
450 extern int xprt_rdma_pad_optimize;
451 
452 /* This setting controls the hunt for a supported memory
453  * registration strategy.
454  */
455 extern unsigned int xprt_rdma_memreg_strategy;
456 
457 /*
458  * Interface Adapter calls - xprtrdma/verbs.c
459  */
460 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt);
461 void rpcrdma_ia_remove(struct rpcrdma_ia *ia);
462 void rpcrdma_ia_close(struct rpcrdma_ia *);
463 
464 /*
465  * Endpoint calls - xprtrdma/verbs.c
466  */
467 int rpcrdma_ep_create(struct rpcrdma_xprt *r_xprt);
468 void rpcrdma_ep_destroy(struct rpcrdma_xprt *r_xprt);
469 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
470 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
471 
472 int rpcrdma_post_sends(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
473 void rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp);
474 
475 /*
476  * Buffer calls - xprtrdma/verbs.c
477  */
478 struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt, size_t size,
479                                        gfp_t flags);
480 int rpcrdma_req_setup(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
481 void rpcrdma_req_destroy(struct rpcrdma_req *req);
482 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
483 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
484 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_xprt *r_xprt);
485 
486 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
487 void rpcrdma_mr_put(struct rpcrdma_mr *mr);
488 void rpcrdma_mrs_refresh(struct rpcrdma_xprt *r_xprt);
489 
490 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
491 void rpcrdma_buffer_put(struct rpcrdma_buffer *buffers,
492                         struct rpcrdma_req *req);
493 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
494 
495 bool rpcrdma_regbuf_realloc(struct rpcrdma_regbuf *rb, size_t size,
496                             gfp_t flags);
497 bool __rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
498                               struct rpcrdma_regbuf *rb);
499 
500 /**
501  * rpcrdma_regbuf_is_mapped - check if buffer is DMA mapped
502  *
503  * Returns true if the buffer is now mapped to rb->rg_device.
504  */
505 static inline bool rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
506 {
507         return rb->rg_device != NULL;
508 }
509 
510 /**
511  * rpcrdma_regbuf_dma_map - DMA-map a regbuf
512  * @r_xprt: controlling transport instance
513  * @rb: regbuf to be mapped
514  *
515  * Returns true if the buffer is currently DMA mapped.
516  */
517 static inline bool rpcrdma_regbuf_dma_map(struct rpcrdma_xprt *r_xprt,
518                                           struct rpcrdma_regbuf *rb)
519 {
520         if (likely(rpcrdma_regbuf_is_mapped(rb)))
521                 return true;
522         return __rpcrdma_regbuf_dma_map(r_xprt, rb);
523 }
524 
525 /*
526  * Wrappers for chunk registration, shared by read/write chunk code.
527  */
528 
529 static inline enum dma_data_direction
530 rpcrdma_data_dir(bool writing)
531 {
532         return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
533 }
534 
535 /* Memory registration calls xprtrdma/frwr_ops.c
536  */
537 void frwr_reset(struct rpcrdma_req *req);
538 int frwr_query_device(struct rpcrdma_xprt *r_xprt,
539                       const struct ib_device *device);
540 int frwr_init_mr(struct rpcrdma_ia *ia, struct rpcrdma_mr *mr);
541 void frwr_release_mr(struct rpcrdma_mr *mr);
542 struct rpcrdma_mr_seg *frwr_map(struct rpcrdma_xprt *r_xprt,
543                                 struct rpcrdma_mr_seg *seg,
544                                 int nsegs, bool writing, __be32 xid,
545                                 struct rpcrdma_mr *mr);
546 int frwr_send(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
547 void frwr_reminv(struct rpcrdma_rep *rep, struct list_head *mrs);
548 void frwr_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
549 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req);
550 
551 /*
552  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
553  */
554 
555 enum rpcrdma_chunktype {
556         rpcrdma_noch = 0,
557         rpcrdma_noch_pullup,
558         rpcrdma_noch_mapped,
559         rpcrdma_readch,
560         rpcrdma_areadch,
561         rpcrdma_writech,
562         rpcrdma_replych
563 };
564 
565 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
566                               struct rpcrdma_req *req, u32 hdrlen,
567                               struct xdr_buf *xdr,
568                               enum rpcrdma_chunktype rtype);
569 void rpcrdma_sendctx_unmap(struct rpcrdma_sendctx *sc);
570 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
571 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *);
572 void rpcrdma_reset_cwnd(struct rpcrdma_xprt *r_xprt);
573 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
574 void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
575 
576 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
577 {
578         xdr->head[0].iov_len = len;
579         xdr->len = len;
580 }
581 
582 /* RPC/RDMA module init - xprtrdma/transport.c
583  */
584 extern unsigned int xprt_rdma_max_inline_read;
585 extern unsigned int xprt_rdma_max_inline_write;
586 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
587 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
588 void xprt_rdma_close(struct rpc_xprt *xprt);
589 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
590 int xprt_rdma_init(void);
591 void xprt_rdma_cleanup(void);
592 
593 /* Backchannel calls - xprtrdma/backchannel.c
594  */
595 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
596 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
597 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
598 unsigned int xprt_rdma_bc_max_slots(struct rpc_xprt *);
599 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
600 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
601 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst);
602 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
603 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
604 #endif  /* CONFIG_SUNRPC_BACKCHANNEL */
605 
606 extern struct xprt_class xprt_rdma_bc;
607 
608 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
609 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp