~ [ 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 /*
  2  * Copyright (c) 2014-2017 Oracle.  All rights reserved.
  3  * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
  4  *
  5  * This software is available to you under a choice of one of two
  6  * licenses.  You may choose to be licensed under the terms of the GNU
  7  * General Public License (GPL) Version 2, available from the file
  8  * COPYING in the main directory of this source tree, or the BSD-type
  9  * license below:
 10  *
 11  * Redistribution and use in source and binary forms, with or without
 12  * modification, are permitted provided that the following conditions
 13  * are met:
 14  *
 15  *      Redistributions of source code must retain the above copyright
 16  *      notice, this list of conditions and the following disclaimer.
 17  *
 18  *      Redistributions in binary form must reproduce the above
 19  *      copyright notice, this list of conditions and the following
 20  *      disclaimer in the documentation and/or other materials provided
 21  *      with the distribution.
 22  *
 23  *      Neither the name of the Network Appliance, Inc. nor the names of
 24  *      its contributors may be used to endorse or promote products
 25  *      derived from this software without specific prior written
 26  *      permission.
 27  *
 28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 39  */
 40 
 41 #ifndef _LINUX_SUNRPC_XPRT_RDMA_H
 42 #define _LINUX_SUNRPC_XPRT_RDMA_H
 43 
 44 #include <linux/wait.h>                 /* wait_queue_head_t, etc */
 45 #include <linux/spinlock.h>             /* spinlock_t, etc */
 46 #include <linux/atomic.h>                       /* atomic_t, etc */
 47 #include <linux/workqueue.h>            /* struct work_struct */
 48 
 49 #include <rdma/rdma_cm.h>               /* RDMA connection api */
 50 #include <rdma/ib_verbs.h>              /* RDMA verbs api */
 51 
 52 #include <linux/sunrpc/clnt.h>          /* rpc_xprt */
 53 #include <linux/sunrpc/rpc_rdma.h>      /* RPC/RDMA protocol */
 54 #include <linux/sunrpc/xprtrdma.h>      /* xprt parameters */
 55 
 56 #define RDMA_RESOLVE_TIMEOUT    (5000)  /* 5 seconds */
 57 #define RDMA_CONNECT_RETRY_MAX  (2)     /* retries if no listener backlog */
 58 
 59 #define RPCRDMA_BIND_TO         (60U * HZ)
 60 #define RPCRDMA_INIT_REEST_TO   (5U * HZ)
 61 #define RPCRDMA_MAX_REEST_TO    (30U * HZ)
 62 #define RPCRDMA_IDLE_DISC_TO    (5U * 60 * HZ)
 63 
 64 /*
 65  * Interface Adapter -- one per transport instance
 66  */
 67 struct rpcrdma_ia {
 68         const struct rpcrdma_memreg_ops *ri_ops;
 69         struct ib_device        *ri_device;
 70         struct rdma_cm_id       *ri_id;
 71         struct ib_pd            *ri_pd;
 72         struct completion       ri_done;
 73         struct completion       ri_remove_done;
 74         int                     ri_async_rc;
 75         unsigned int            ri_max_segs;
 76         unsigned int            ri_max_frwr_depth;
 77         unsigned int            ri_max_inline_write;
 78         unsigned int            ri_max_inline_read;
 79         unsigned int            ri_max_send_sges;
 80         bool                    ri_implicit_roundup;
 81         enum ib_mr_type         ri_mrtype;
 82         unsigned long           ri_flags;
 83         struct ib_qp_attr       ri_qp_attr;
 84         struct ib_qp_init_attr  ri_qp_init_attr;
 85 };
 86 
 87 enum {
 88         RPCRDMA_IAF_REMOVING = 0,
 89 };
 90 
 91 /*
 92  * RDMA Endpoint -- one per transport instance
 93  */
 94 
 95 struct rpcrdma_ep {
 96         unsigned int            rep_send_count;
 97         unsigned int            rep_send_batch;
 98         int                     rep_connected;
 99         struct ib_qp_init_attr  rep_attr;
100         wait_queue_head_t       rep_connect_wait;
101         struct rpcrdma_connect_private  rep_cm_private;
102         struct rdma_conn_param  rep_remote_cma;
103         struct delayed_work     rep_connect_worker;
104 };
105 
106 /* Pre-allocate extra Work Requests for handling backward receives
107  * and sends. This is a fixed value because the Work Queues are
108  * allocated when the forward channel is set up.
109  */
110 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
111 #define RPCRDMA_BACKWARD_WRS            (8)
112 #else
113 #define RPCRDMA_BACKWARD_WRS            (0)
114 #endif
115 
116 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
117  *
118  * The below structure appears at the front of a large region of kmalloc'd
119  * memory, which always starts on a good alignment boundary.
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         __be32                  rg_base[0] __attribute__ ((aligned(256)));
127 };
128 
129 static inline u64
130 rdmab_addr(struct rpcrdma_regbuf *rb)
131 {
132         return rb->rg_iov.addr;
133 }
134 
135 static inline u32
136 rdmab_length(struct rpcrdma_regbuf *rb)
137 {
138         return rb->rg_iov.length;
139 }
140 
141 static inline u32
142 rdmab_lkey(struct rpcrdma_regbuf *rb)
143 {
144         return rb->rg_iov.lkey;
145 }
146 
147 static inline struct ib_device *
148 rdmab_device(struct rpcrdma_regbuf *rb)
149 {
150         return rb->rg_device;
151 }
152 
153 #define RPCRDMA_DEF_GFP         (GFP_NOIO | __GFP_NOWARN)
154 
155 /* To ensure a transport can always make forward progress,
156  * the number of RDMA segments allowed in header chunk lists
157  * is capped at 8. This prevents less-capable devices and
158  * memory registrations from overrunning the Send buffer
159  * while building chunk lists.
160  *
161  * Elements of the Read list take up more room than the
162  * Write list or Reply chunk. 8 read segments means the Read
163  * list (or Write list or Reply chunk) cannot consume more
164  * than
165  *
166  * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes.
167  *
168  * And the fixed part of the header is another 24 bytes.
169  *
170  * The smallest inline threshold is 1024 bytes, ensuring that
171  * at least 750 bytes are available for RPC messages.
172  */
173 enum {
174         RPCRDMA_MAX_HDR_SEGS = 8,
175         RPCRDMA_HDRBUF_SIZE = 256,
176 };
177 
178 /*
179  * struct rpcrdma_rep -- this structure encapsulates state required
180  * to receive and complete an RPC Reply, asychronously. It needs
181  * several pieces of state:
182  *
183  *   o receive buffer and ib_sge (donated to provider)
184  *   o status of receive (success or not, length, inv rkey)
185  *   o bookkeeping state to get run by reply handler (XDR stream)
186  *
187  * These structures are allocated during transport initialization.
188  * N of these are associated with a transport instance, managed by
189  * struct rpcrdma_buffer. N is the max number of outstanding RPCs.
190  */
191 
192 struct rpcrdma_rep {
193         struct ib_cqe           rr_cqe;
194         __be32                  rr_xid;
195         __be32                  rr_vers;
196         __be32                  rr_proc;
197         int                     rr_wc_flags;
198         u32                     rr_inv_rkey;
199         struct rpcrdma_regbuf   *rr_rdmabuf;
200         struct rpcrdma_xprt     *rr_rxprt;
201         struct work_struct      rr_work;
202         struct xdr_buf          rr_hdrbuf;
203         struct xdr_stream       rr_stream;
204         struct rpc_rqst         *rr_rqst;
205         struct list_head        rr_list;
206         struct ib_recv_wr       rr_recv_wr;
207 };
208 
209 /* struct rpcrdma_sendctx - DMA mapped SGEs to unmap after Send completes
210  */
211 struct rpcrdma_req;
212 struct rpcrdma_xprt;
213 struct rpcrdma_sendctx {
214         struct ib_send_wr       sc_wr;
215         struct ib_cqe           sc_cqe;
216         struct rpcrdma_xprt     *sc_xprt;
217         struct rpcrdma_req      *sc_req;
218         unsigned int            sc_unmap_count;
219         struct ib_sge           sc_sges[];
220 };
221 
222 /* Limit the number of SGEs that can be unmapped during one
223  * Send completion. This caps the amount of work a single
224  * completion can do before returning to the provider.
225  *
226  * Setting this to zero disables Send completion batching.
227  */
228 enum {
229         RPCRDMA_MAX_SEND_BATCH = 7,
230 };
231 
232 /*
233  * struct rpcrdma_mr - external memory region metadata
234  *
235  * An external memory region is any buffer or page that is registered
236  * on the fly (ie, not pre-registered).
237  *
238  * Each rpcrdma_buffer has a list of free MWs anchored in rb_mrs. During
239  * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
240  * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
241  * track of registration metadata while each RPC is pending.
242  * rpcrdma_deregister_external() uses this metadata to unmap and
243  * release these resources when an RPC is complete.
244  */
245 enum rpcrdma_frwr_state {
246         FRWR_IS_INVALID,        /* ready to be used */
247         FRWR_IS_VALID,          /* in use */
248         FRWR_FLUSHED_FR,        /* flushed FASTREG WR */
249         FRWR_FLUSHED_LI,        /* flushed LOCALINV WR */
250 };
251 
252 struct rpcrdma_frwr {
253         struct ib_mr                    *fr_mr;
254         struct ib_cqe                   fr_cqe;
255         enum rpcrdma_frwr_state         fr_state;
256         struct completion               fr_linv_done;
257         union {
258                 struct ib_reg_wr        fr_regwr;
259                 struct ib_send_wr       fr_invwr;
260         };
261 };
262 
263 struct rpcrdma_fmr {
264         struct ib_fmr           *fm_mr;
265         u64                     *fm_physaddrs;
266 };
267 
268 struct rpcrdma_mr {
269         struct list_head        mr_list;
270         struct scatterlist      *mr_sg;
271         int                     mr_nents;
272         enum dma_data_direction mr_dir;
273         union {
274                 struct rpcrdma_fmr      fmr;
275                 struct rpcrdma_frwr     frwr;
276         };
277         struct rpcrdma_xprt     *mr_xprt;
278         u32                     mr_handle;
279         u32                     mr_length;
280         u64                     mr_offset;
281         struct list_head        mr_all;
282 };
283 
284 /*
285  * struct rpcrdma_req -- structure central to the request/reply sequence.
286  *
287  * N of these are associated with a transport instance, and stored in
288  * struct rpcrdma_buffer. N is the max number of outstanding requests.
289  *
290  * It includes pre-registered buffer memory for send AND recv.
291  * The recv buffer, however, is not owned by this structure, and
292  * is "donated" to the hardware when a recv is posted. When a
293  * reply is handled, the recv buffer used is given back to the
294  * struct rpcrdma_req associated with the request.
295  *
296  * In addition to the basic memory, this structure includes an array
297  * of iovs for send operations. The reason is that the iovs passed to
298  * ib_post_{send,recv} must not be modified until the work request
299  * completes.
300  */
301 
302 /* Maximum number of page-sized "segments" per chunk list to be
303  * registered or invalidated. Must handle a Reply chunk:
304  */
305 enum {
306         RPCRDMA_MAX_IOV_SEGS    = 3,
307         RPCRDMA_MAX_DATA_SEGS   = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
308         RPCRDMA_MAX_SEGS        = RPCRDMA_MAX_DATA_SEGS +
309                                   RPCRDMA_MAX_IOV_SEGS,
310 };
311 
312 struct rpcrdma_mr_seg {         /* chunk descriptors */
313         u32             mr_len;         /* length of chunk or segment */
314         struct page     *mr_page;       /* owning page, if any */
315         char            *mr_offset;     /* kva if no page, else offset */
316 };
317 
318 /* The Send SGE array is provisioned to send a maximum size
319  * inline request:
320  * - RPC-over-RDMA header
321  * - xdr_buf head iovec
322  * - RPCRDMA_MAX_INLINE bytes, in pages
323  * - xdr_buf tail iovec
324  *
325  * The actual number of array elements consumed by each RPC
326  * depends on the device's max_sge limit.
327  */
328 enum {
329         RPCRDMA_MIN_SEND_SGES = 3,
330         RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
331         RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
332 };
333 
334 struct rpcrdma_buffer;
335 struct rpcrdma_req {
336         struct list_head        rl_list;
337         unsigned int            rl_connect_cookie;
338         struct rpcrdma_buffer   *rl_buffer;
339         struct rpcrdma_rep      *rl_reply;
340         struct xdr_stream       rl_stream;
341         struct xdr_buf          rl_hdrbuf;
342         struct rpcrdma_sendctx  *rl_sendctx;
343         struct rpcrdma_regbuf   *rl_rdmabuf;    /* xprt header */
344         struct rpcrdma_regbuf   *rl_sendbuf;    /* rq_snd_buf */
345         struct rpcrdma_regbuf   *rl_recvbuf;    /* rq_rcv_buf */
346 
347         struct list_head        rl_all;
348         unsigned long           rl_flags;
349 
350         struct list_head        rl_registered;  /* registered segments */
351         struct rpcrdma_mr_seg   rl_segments[RPCRDMA_MAX_SEGS];
352 };
353 
354 /* rl_flags */
355 enum {
356         RPCRDMA_REQ_F_PENDING = 0,
357         RPCRDMA_REQ_F_TX_RESOURCES,
358 };
359 
360 static inline void
361 rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req)
362 {
363         rqst->rq_xprtdata = req;
364 }
365 
366 static inline struct rpcrdma_req *
367 rpcr_to_rdmar(const struct rpc_rqst *rqst)
368 {
369         return rqst->rq_xprtdata;
370 }
371 
372 static inline void
373 rpcrdma_mr_push(struct rpcrdma_mr *mr, struct list_head *list)
374 {
375         list_add_tail(&mr->mr_list, list);
376 }
377 
378 static inline struct rpcrdma_mr *
379 rpcrdma_mr_pop(struct list_head *list)
380 {
381         struct rpcrdma_mr *mr;
382 
383         mr = list_first_entry(list, struct rpcrdma_mr, mr_list);
384         list_del_init(&mr->mr_list);
385         return mr;
386 }
387 
388 /*
389  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
390  * inline requests/replies, and client/server credits.
391  *
392  * One of these is associated with a transport instance
393  */
394 struct rpcrdma_buffer {
395         spinlock_t              rb_mrlock;      /* protect rb_mrs list */
396         struct list_head        rb_mrs;
397         struct list_head        rb_all;
398 
399         unsigned long           rb_sc_head;
400         unsigned long           rb_sc_tail;
401         unsigned long           rb_sc_last;
402         struct rpcrdma_sendctx  **rb_sc_ctxs;
403 
404         spinlock_t              rb_lock;        /* protect buf lists */
405         int                     rb_send_count, rb_recv_count;
406         struct list_head        rb_send_bufs;
407         struct list_head        rb_recv_bufs;
408         u32                     rb_max_requests;
409         u32                     rb_credits;     /* most recent credit grant */
410 
411         u32                     rb_bc_srv_max_requests;
412         spinlock_t              rb_reqslock;    /* protect rb_allreqs */
413         struct list_head        rb_allreqs;
414 
415         u32                     rb_bc_max_requests;
416 
417         spinlock_t              rb_recovery_lock; /* protect rb_stale_mrs */
418         struct list_head        rb_stale_mrs;
419         struct delayed_work     rb_recovery_worker;
420         struct delayed_work     rb_refresh_worker;
421 };
422 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
423 
424 /*
425  * Internal structure for transport instance creation. This
426  * exists primarily for modularity.
427  *
428  * This data should be set with mount options
429  */
430 struct rpcrdma_create_data_internal {
431         unsigned int    max_requests;   /* max requests (slots) in flight */
432         unsigned int    rsize;          /* mount rsize - max read hdr+data */
433         unsigned int    wsize;          /* mount wsize - max write hdr+data */
434         unsigned int    inline_rsize;   /* max non-rdma read data payload */
435         unsigned int    inline_wsize;   /* max non-rdma write data payload */
436 };
437 
438 /*
439  * Statistics for RPCRDMA
440  */
441 struct rpcrdma_stats {
442         /* accessed when sending a call */
443         unsigned long           read_chunk_count;
444         unsigned long           write_chunk_count;
445         unsigned long           reply_chunk_count;
446         unsigned long long      total_rdma_request;
447 
448         /* rarely accessed error counters */
449         unsigned long long      pullup_copy_count;
450         unsigned long           hardway_register_count;
451         unsigned long           failed_marshal_count;
452         unsigned long           bad_reply_count;
453         unsigned long           mrs_recovered;
454         unsigned long           mrs_orphaned;
455         unsigned long           mrs_allocated;
456         unsigned long           empty_sendctx_q;
457 
458         /* accessed when receiving a reply */
459         unsigned long long      total_rdma_reply;
460         unsigned long long      fixup_copy_count;
461         unsigned long           reply_waits_for_send;
462         unsigned long           local_inv_needed;
463         unsigned long           nomsg_call_count;
464         unsigned long           bcall_count;
465 };
466 
467 /*
468  * Per-registration mode operations
469  */
470 struct rpcrdma_xprt;
471 struct rpcrdma_memreg_ops {
472         struct rpcrdma_mr_seg *
473                         (*ro_map)(struct rpcrdma_xprt *,
474                                   struct rpcrdma_mr_seg *, int, bool,
475                                   struct rpcrdma_mr **);
476         void            (*ro_reminv)(struct rpcrdma_rep *rep,
477                                      struct list_head *mrs);
478         void            (*ro_unmap_sync)(struct rpcrdma_xprt *,
479                                          struct list_head *);
480         void            (*ro_recover_mr)(struct rpcrdma_mr *mr);
481         int             (*ro_open)(struct rpcrdma_ia *,
482                                    struct rpcrdma_ep *,
483                                    struct rpcrdma_create_data_internal *);
484         size_t          (*ro_maxpages)(struct rpcrdma_xprt *);
485         int             (*ro_init_mr)(struct rpcrdma_ia *,
486                                       struct rpcrdma_mr *);
487         void            (*ro_release_mr)(struct rpcrdma_mr *mr);
488         const char      *ro_displayname;
489         const int       ro_send_w_inv_ok;
490 };
491 
492 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
493 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
494 
495 /*
496  * RPCRDMA transport -- encapsulates the structures above for
497  * integration with RPC.
498  *
499  * The contained structures are embedded, not pointers,
500  * for convenience. This structure need not be visible externally.
501  *
502  * It is allocated and initialized during mount, and released
503  * during unmount.
504  */
505 struct rpcrdma_xprt {
506         struct rpc_xprt         rx_xprt;
507         struct rpcrdma_ia       rx_ia;
508         struct rpcrdma_ep       rx_ep;
509         struct rpcrdma_buffer   rx_buf;
510         struct rpcrdma_create_data_internal rx_data;
511         struct delayed_work     rx_connect_worker;
512         struct rpcrdma_stats    rx_stats;
513 };
514 
515 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
516 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
517 
518 static inline const char *
519 rpcrdma_addrstr(const struct rpcrdma_xprt *r_xprt)
520 {
521         return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_ADDR];
522 }
523 
524 static inline const char *
525 rpcrdma_portstr(const struct rpcrdma_xprt *r_xprt)
526 {
527         return r_xprt->rx_xprt.address_strings[RPC_DISPLAY_PORT];
528 }
529 
530 /* Setting this to 0 ensures interoperability with early servers.
531  * Setting this to 1 enhances certain unaligned read/write performance.
532  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
533 extern int xprt_rdma_pad_optimize;
534 
535 /* This setting controls the hunt for a supported memory
536  * registration strategy.
537  */
538 extern unsigned int xprt_rdma_memreg_strategy;
539 
540 /*
541  * Interface Adapter calls - xprtrdma/verbs.c
542  */
543 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt);
544 void rpcrdma_ia_remove(struct rpcrdma_ia *ia);
545 void rpcrdma_ia_close(struct rpcrdma_ia *);
546 bool frwr_is_supported(struct rpcrdma_ia *);
547 bool fmr_is_supported(struct rpcrdma_ia *);
548 
549 extern struct workqueue_struct *rpcrdma_receive_wq;
550 
551 /*
552  * Endpoint calls - xprtrdma/verbs.c
553  */
554 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
555                                 struct rpcrdma_create_data_internal *);
556 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
557 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
558 void rpcrdma_conn_func(struct rpcrdma_ep *ep);
559 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
560 
561 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
562                                 struct rpcrdma_req *);
563 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *);
564 
565 /*
566  * Buffer calls - xprtrdma/verbs.c
567  */
568 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
569 void rpcrdma_destroy_req(struct rpcrdma_req *);
570 int rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt);
571 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
572 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
573 struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf);
574 void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc);
575 
576 struct rpcrdma_mr *rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt);
577 void rpcrdma_mr_put(struct rpcrdma_mr *mr);
578 void rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr);
579 void rpcrdma_mr_defer_recovery(struct rpcrdma_mr *mr);
580 
581 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
582 void rpcrdma_buffer_put(struct rpcrdma_req *);
583 void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
584 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
585 
586 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction,
587                                             gfp_t);
588 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *);
589 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *);
590 
591 static inline bool
592 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
593 {
594         return rb->rg_device != NULL;
595 }
596 
597 static inline bool
598 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
599 {
600         if (likely(rpcrdma_regbuf_is_mapped(rb)))
601                 return true;
602         return __rpcrdma_dma_map_regbuf(ia, rb);
603 }
604 
605 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
606 
607 int rpcrdma_alloc_wq(void);
608 void rpcrdma_destroy_wq(void);
609 
610 /*
611  * Wrappers for chunk registration, shared by read/write chunk code.
612  */
613 
614 static inline enum dma_data_direction
615 rpcrdma_data_dir(bool writing)
616 {
617         return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
618 }
619 
620 /*
621  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
622  */
623 
624 enum rpcrdma_chunktype {
625         rpcrdma_noch = 0,
626         rpcrdma_readch,
627         rpcrdma_areadch,
628         rpcrdma_writech,
629         rpcrdma_replych
630 };
631 
632 int rpcrdma_prepare_send_sges(struct rpcrdma_xprt *r_xprt,
633                               struct rpcrdma_req *req, u32 hdrlen,
634                               struct xdr_buf *xdr,
635                               enum rpcrdma_chunktype rtype);
636 void rpcrdma_unmap_sendctx(struct rpcrdma_sendctx *sc);
637 int rpcrdma_marshal_req(struct rpcrdma_xprt *r_xprt, struct rpc_rqst *rqst);
638 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *);
639 void rpcrdma_complete_rqst(struct rpcrdma_rep *rep);
640 void rpcrdma_reply_handler(struct rpcrdma_rep *rep);
641 void rpcrdma_release_rqst(struct rpcrdma_xprt *r_xprt,
642                           struct rpcrdma_req *req);
643 void rpcrdma_deferred_completion(struct work_struct *work);
644 
645 static inline void rpcrdma_set_xdrlen(struct xdr_buf *xdr, size_t len)
646 {
647         xdr->head[0].iov_len = len;
648         xdr->len = len;
649 }
650 
651 /* RPC/RDMA module init - xprtrdma/transport.c
652  */
653 extern unsigned int xprt_rdma_max_inline_read;
654 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
655 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
656 void rpcrdma_connect_worker(struct work_struct *work);
657 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
658 int xprt_rdma_init(void);
659 void xprt_rdma_cleanup(void);
660 
661 /* Backchannel calls - xprtrdma/backchannel.c
662  */
663 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
664 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
665 int xprt_rdma_bc_up(struct svc_serv *, struct net *);
666 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
667 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
668 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
669 int xprt_rdma_bc_send_reply(struct rpc_rqst *rqst);
670 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
671 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
672 #endif  /* CONFIG_SUNRPC_BACKCHANNEL */
673 
674 extern struct xprt_class xprt_rdma_bc;
675 
676 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
677 
678 #include <trace/events/rpcrdma.h>
679 

~ [ 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