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

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

Version: ~ [ linux-5.18 ] ~ [ linux-5.17.9 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.41 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.117 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.195 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.244 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.280 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.315 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         struct completion       ri_remove_done;
 73         int                     ri_async_rc;
 74         unsigned int            ri_max_segs;
 75         unsigned int            ri_max_frmr_depth;
 76         unsigned int            ri_max_inline_write;
 77         unsigned int            ri_max_inline_read;
 78         unsigned int            ri_max_send_sges;
 79         bool                    ri_reminv_expected;
 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         atomic_t                rep_cqcount;
 97         int                     rep_cqinit;
 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 sockaddr_storage rep_remote_addr;
104         struct delayed_work     rep_connect_worker;
105 };
106 
107 static inline void
108 rpcrdma_init_cqcount(struct rpcrdma_ep *ep, int count)
109 {
110         atomic_set(&ep->rep_cqcount, ep->rep_cqinit - count);
111 }
112 
113 /* To update send queue accounting, provider must take a
114  * send completion every now and then.
115  */
116 static inline void
117 rpcrdma_set_signaled(struct rpcrdma_ep *ep, struct ib_send_wr *send_wr)
118 {
119         send_wr->send_flags = 0;
120         if (unlikely(atomic_sub_return(1, &ep->rep_cqcount) <= 0)) {
121                 rpcrdma_init_cqcount(ep, 0);
122                 send_wr->send_flags = IB_SEND_SIGNALED;
123         }
124 }
125 
126 /* Pre-allocate extra Work Requests for handling backward receives
127  * and sends. This is a fixed value because the Work Queues are
128  * allocated when the forward channel is set up.
129  */
130 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
131 #define RPCRDMA_BACKWARD_WRS            (8)
132 #else
133 #define RPCRDMA_BACKWARD_WRS            (0)
134 #endif
135 
136 /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV
137  *
138  * The below structure appears at the front of a large region of kmalloc'd
139  * memory, which always starts on a good alignment boundary.
140  */
141 
142 struct rpcrdma_regbuf {
143         struct ib_sge           rg_iov;
144         struct ib_device        *rg_device;
145         enum dma_data_direction rg_direction;
146         __be32                  rg_base[0] __attribute__ ((aligned(256)));
147 };
148 
149 static inline u64
150 rdmab_addr(struct rpcrdma_regbuf *rb)
151 {
152         return rb->rg_iov.addr;
153 }
154 
155 static inline u32
156 rdmab_length(struct rpcrdma_regbuf *rb)
157 {
158         return rb->rg_iov.length;
159 }
160 
161 static inline u32
162 rdmab_lkey(struct rpcrdma_regbuf *rb)
163 {
164         return rb->rg_iov.lkey;
165 }
166 
167 static inline struct rpcrdma_msg *
168 rdmab_to_msg(struct rpcrdma_regbuf *rb)
169 {
170         return (struct rpcrdma_msg *)rb->rg_base;
171 }
172 
173 static inline struct ib_device *
174 rdmab_device(struct rpcrdma_regbuf *rb)
175 {
176         return rb->rg_device;
177 }
178 
179 #define RPCRDMA_DEF_GFP         (GFP_NOIO | __GFP_NOWARN)
180 
181 /* To ensure a transport can always make forward progress,
182  * the number of RDMA segments allowed in header chunk lists
183  * is capped at 8. This prevents less-capable devices and
184  * memory registrations from overrunning the Send buffer
185  * while building chunk lists.
186  *
187  * Elements of the Read list take up more room than the
188  * Write list or Reply chunk. 8 read segments means the Read
189  * list (or Write list or Reply chunk) cannot consume more
190  * than
191  *
192  * ((8 + 2) * read segment size) + 1 XDR words, or 244 bytes.
193  *
194  * And the fixed part of the header is another 24 bytes.
195  *
196  * The smallest inline threshold is 1024 bytes, ensuring that
197  * at least 750 bytes are available for RPC messages.
198  */
199 enum {
200         RPCRDMA_MAX_HDR_SEGS = 8,
201         RPCRDMA_HDRBUF_SIZE = 256,
202 };
203 
204 /*
205  * struct rpcrdma_rep -- this structure encapsulates state required to recv
206  * and complete a reply, asychronously. It needs several pieces of
207  * state:
208  *   o recv buffer (posted to provider)
209  *   o ib_sge (also donated to provider)
210  *   o status of reply (length, success or not)
211  *   o bookkeeping state to get run by reply handler (list, etc)
212  *
213  * These are allocated during initialization, per-transport instance.
214  *
215  * N of these are associated with a transport instance, and stored in
216  * struct rpcrdma_buffer. N is the max number of outstanding requests.
217  */
218 
219 struct rpcrdma_rep {
220         struct ib_cqe           rr_cqe;
221         unsigned int            rr_len;
222         int                     rr_wc_flags;
223         u32                     rr_inv_rkey;
224         struct rpcrdma_xprt     *rr_rxprt;
225         struct work_struct      rr_work;
226         struct list_head        rr_list;
227         struct ib_recv_wr       rr_recv_wr;
228         struct rpcrdma_regbuf   *rr_rdmabuf;
229 };
230 
231 #define RPCRDMA_BAD_LEN         (~0U)
232 
233 /*
234  * struct rpcrdma_mw - external memory region metadata
235  *
236  * An external memory region is any buffer or page that is registered
237  * on the fly (ie, not pre-registered).
238  *
239  * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During
240  * call_allocate, rpcrdma_buffer_get() assigns one to each segment in
241  * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep
242  * track of registration metadata while each RPC is pending.
243  * rpcrdma_deregister_external() uses this metadata to unmap and
244  * release these resources when an RPC is complete.
245  */
246 enum rpcrdma_frmr_state {
247         FRMR_IS_INVALID,        /* ready to be used */
248         FRMR_IS_VALID,          /* in use */
249         FRMR_FLUSHED_FR,        /* flushed FASTREG WR */
250         FRMR_FLUSHED_LI,        /* flushed LOCALINV WR */
251 };
252 
253 struct rpcrdma_frmr {
254         struct ib_mr                    *fr_mr;
255         struct ib_cqe                   fr_cqe;
256         enum rpcrdma_frmr_state         fr_state;
257         struct completion               fr_linv_done;
258         union {
259                 struct ib_reg_wr        fr_regwr;
260                 struct ib_send_wr       fr_invwr;
261         };
262 };
263 
264 struct rpcrdma_fmr {
265         struct ib_fmr           *fm_mr;
266         u64                     *fm_physaddrs;
267 };
268 
269 struct rpcrdma_mw {
270         struct list_head        mw_list;
271         struct scatterlist      *mw_sg;
272         int                     mw_nents;
273         enum dma_data_direction mw_dir;
274         unsigned long           mw_flags;
275         union {
276                 struct rpcrdma_fmr      fmr;
277                 struct rpcrdma_frmr     frmr;
278         };
279         struct rpcrdma_xprt     *mw_xprt;
280         u32                     mw_handle;
281         u32                     mw_length;
282         u64                     mw_offset;
283         struct list_head        mw_all;
284 };
285 
286 /* mw_flags */
287 enum {
288         RPCRDMA_MW_F_RI         = 1,
289 };
290 
291 /*
292  * struct rpcrdma_req -- structure central to the request/reply sequence.
293  *
294  * N of these are associated with a transport instance, and stored in
295  * struct rpcrdma_buffer. N is the max number of outstanding requests.
296  *
297  * It includes pre-registered buffer memory for send AND recv.
298  * The recv buffer, however, is not owned by this structure, and
299  * is "donated" to the hardware when a recv is posted. When a
300  * reply is handled, the recv buffer used is given back to the
301  * struct rpcrdma_req associated with the request.
302  *
303  * In addition to the basic memory, this structure includes an array
304  * of iovs for send operations. The reason is that the iovs passed to
305  * ib_post_{send,recv} must not be modified until the work request
306  * completes.
307  */
308 
309 /* Maximum number of page-sized "segments" per chunk list to be
310  * registered or invalidated. Must handle a Reply chunk:
311  */
312 enum {
313         RPCRDMA_MAX_IOV_SEGS    = 3,
314         RPCRDMA_MAX_DATA_SEGS   = ((1 * 1024 * 1024) / PAGE_SIZE) + 1,
315         RPCRDMA_MAX_SEGS        = RPCRDMA_MAX_DATA_SEGS +
316                                   RPCRDMA_MAX_IOV_SEGS,
317 };
318 
319 struct rpcrdma_mr_seg {         /* chunk descriptors */
320         u32             mr_len;         /* length of chunk or segment */
321         struct page     *mr_page;       /* owning page, if any */
322         char            *mr_offset;     /* kva if no page, else offset */
323 };
324 
325 /* The Send SGE array is provisioned to send a maximum size
326  * inline request:
327  * - RPC-over-RDMA header
328  * - xdr_buf head iovec
329  * - RPCRDMA_MAX_INLINE bytes, in pages
330  * - xdr_buf tail iovec
331  *
332  * The actual number of array elements consumed by each RPC
333  * depends on the device's max_sge limit.
334  */
335 enum {
336         RPCRDMA_MIN_SEND_SGES = 3,
337         RPCRDMA_MAX_PAGE_SGES = RPCRDMA_MAX_INLINE >> PAGE_SHIFT,
338         RPCRDMA_MAX_SEND_SGES = 1 + 1 + RPCRDMA_MAX_PAGE_SGES + 1,
339 };
340 
341 struct rpcrdma_buffer;
342 struct rpcrdma_req {
343         struct list_head        rl_list;
344         __be32                  rl_xid;
345         unsigned int            rl_mapped_sges;
346         unsigned int            rl_connect_cookie;
347         struct rpcrdma_buffer   *rl_buffer;
348         struct rpcrdma_rep      *rl_reply;
349         struct ib_send_wr       rl_send_wr;
350         struct ib_sge           rl_send_sge[RPCRDMA_MAX_SEND_SGES];
351         struct rpcrdma_regbuf   *rl_rdmabuf;    /* xprt header */
352         struct rpcrdma_regbuf   *rl_sendbuf;    /* rq_snd_buf */
353         struct rpcrdma_regbuf   *rl_recvbuf;    /* rq_rcv_buf */
354 
355         struct ib_cqe           rl_cqe;
356         struct list_head        rl_all;
357         bool                    rl_backchannel;
358 
359         struct list_head        rl_registered;  /* registered segments */
360         struct rpcrdma_mr_seg   rl_segments[RPCRDMA_MAX_SEGS];
361 };
362 
363 static inline void
364 rpcrdma_set_xprtdata(struct rpc_rqst *rqst, struct rpcrdma_req *req)
365 {
366         rqst->rq_xprtdata = req;
367 }
368 
369 static inline struct rpcrdma_req *
370 rpcr_to_rdmar(struct rpc_rqst *rqst)
371 {
372         return rqst->rq_xprtdata;
373 }
374 
375 static inline void
376 rpcrdma_push_mw(struct rpcrdma_mw *mw, struct list_head *list)
377 {
378         list_add_tail(&mw->mw_list, list);
379 }
380 
381 static inline struct rpcrdma_mw *
382 rpcrdma_pop_mw(struct list_head *list)
383 {
384         struct rpcrdma_mw *mw;
385 
386         mw = list_first_entry(list, struct rpcrdma_mw, mw_list);
387         list_del(&mw->mw_list);
388         return mw;
389 }
390 
391 /*
392  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
393  * inline requests/replies, and client/server credits.
394  *
395  * One of these is associated with a transport instance
396  */
397 struct rpcrdma_buffer {
398         spinlock_t              rb_mwlock;      /* protect rb_mws list */
399         struct list_head        rb_mws;
400         struct list_head        rb_all;
401 
402         spinlock_t              rb_lock;        /* protect buf lists */
403         int                     rb_send_count, rb_recv_count;
404         struct list_head        rb_send_bufs;
405         struct list_head        rb_recv_bufs;
406         struct list_head        rb_pending;
407         u32                     rb_max_requests;
408         atomic_t                rb_credits;     /* most recent credit grant */
409 
410         u32                     rb_bc_srv_max_requests;
411         spinlock_t              rb_reqslock;    /* protect rb_allreqs */
412         struct list_head        rb_allreqs;
413 
414         u32                     rb_bc_max_requests;
415 
416         spinlock_t              rb_recovery_lock; /* protect rb_stale_mrs */
417         struct list_head        rb_stale_mrs;
418         struct delayed_work     rb_recovery_worker;
419         struct delayed_work     rb_refresh_worker;
420 };
421 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
422 
423 /*
424  * Internal structure for transport instance creation. This
425  * exists primarily for modularity.
426  *
427  * This data should be set with mount options
428  */
429 struct rpcrdma_create_data_internal {
430         struct sockaddr_storage addr;   /* RDMA server address */
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         unsigned int    padding;        /* non-rdma write header padding */
437 };
438 
439 /*
440  * Statistics for RPCRDMA
441  */
442 struct rpcrdma_stats {
443         unsigned long           read_chunk_count;
444         unsigned long           write_chunk_count;
445         unsigned long           reply_chunk_count;
446 
447         unsigned long long      total_rdma_request;
448         unsigned long long      total_rdma_reply;
449 
450         unsigned long long      pullup_copy_count;
451         unsigned long long      fixup_copy_count;
452         unsigned long           hardway_register_count;
453         unsigned long           failed_marshal_count;
454         unsigned long           bad_reply_count;
455         unsigned long           nomsg_call_count;
456         unsigned long           bcall_count;
457         unsigned long           mrs_recovered;
458         unsigned long           mrs_orphaned;
459         unsigned long           mrs_allocated;
460         unsigned long           local_inv_needed;
461 };
462 
463 /*
464  * Per-registration mode operations
465  */
466 struct rpcrdma_xprt;
467 struct rpcrdma_memreg_ops {
468         int             (*ro_map)(struct rpcrdma_xprt *,
469                                   struct rpcrdma_mr_seg *, int, bool,
470                                   struct rpcrdma_mw **);
471         void            (*ro_unmap_sync)(struct rpcrdma_xprt *,
472                                          struct list_head *);
473         void            (*ro_unmap_safe)(struct rpcrdma_xprt *,
474                                          struct rpcrdma_req *, bool);
475         void            (*ro_recover_mr)(struct rpcrdma_mw *);
476         int             (*ro_open)(struct rpcrdma_ia *,
477                                    struct rpcrdma_ep *,
478                                    struct rpcrdma_create_data_internal *);
479         size_t          (*ro_maxpages)(struct rpcrdma_xprt *);
480         int             (*ro_init_mr)(struct rpcrdma_ia *,
481                                       struct rpcrdma_mw *);
482         void            (*ro_release_mr)(struct rpcrdma_mw *);
483         const char      *ro_displayname;
484         const int       ro_send_w_inv_ok;
485 };
486 
487 extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops;
488 extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops;
489 
490 /*
491  * RPCRDMA transport -- encapsulates the structures above for
492  * integration with RPC.
493  *
494  * The contained structures are embedded, not pointers,
495  * for convenience. This structure need not be visible externally.
496  *
497  * It is allocated and initialized during mount, and released
498  * during unmount.
499  */
500 struct rpcrdma_xprt {
501         struct rpc_xprt         rx_xprt;
502         struct rpcrdma_ia       rx_ia;
503         struct rpcrdma_ep       rx_ep;
504         struct rpcrdma_buffer   rx_buf;
505         struct rpcrdma_create_data_internal rx_data;
506         struct delayed_work     rx_connect_worker;
507         struct rpcrdma_stats    rx_stats;
508 };
509 
510 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt)
511 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
512 
513 /* Setting this to 0 ensures interoperability with early servers.
514  * Setting this to 1 enhances certain unaligned read/write performance.
515  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
516 extern int xprt_rdma_pad_optimize;
517 
518 /* This setting controls the hunt for a supported memory
519  * registration strategy.
520  */
521 extern unsigned int xprt_rdma_memreg_strategy;
522 
523 /*
524  * Interface Adapter calls - xprtrdma/verbs.c
525  */
526 int rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr);
527 void rpcrdma_ia_remove(struct rpcrdma_ia *ia);
528 void rpcrdma_ia_close(struct rpcrdma_ia *);
529 bool frwr_is_supported(struct rpcrdma_ia *);
530 bool fmr_is_supported(struct rpcrdma_ia *);
531 
532 /*
533  * Endpoint calls - xprtrdma/verbs.c
534  */
535 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
536                                 struct rpcrdma_create_data_internal *);
537 void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
538 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
539 void rpcrdma_conn_func(struct rpcrdma_ep *ep);
540 void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
541 
542 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
543                                 struct rpcrdma_req *);
544 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_rep *);
545 
546 /*
547  * Buffer calls - xprtrdma/verbs.c
548  */
549 struct rpcrdma_req *rpcrdma_create_req(struct rpcrdma_xprt *);
550 struct rpcrdma_rep *rpcrdma_create_rep(struct rpcrdma_xprt *);
551 void rpcrdma_destroy_req(struct rpcrdma_req *);
552 int rpcrdma_buffer_create(struct rpcrdma_xprt *);
553 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
554 
555 static inline void
556 rpcrdma_insert_req(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req)
557 {
558         spin_lock(&buffers->rb_lock);
559         if (list_empty(&req->rl_list))
560                 list_add_tail(&req->rl_list, &buffers->rb_pending);
561         spin_unlock(&buffers->rb_lock);
562 }
563 
564 static inline struct rpcrdma_req *
565 rpcrdma_lookup_req_locked(struct rpcrdma_buffer *buffers, __be32 xid)
566 {
567         struct rpcrdma_req *pos;
568 
569         list_for_each_entry(pos, &buffers->rb_pending, rl_list)
570                 if (pos->rl_xid == xid)
571                         return pos;
572         return NULL;
573 }
574 
575 static inline void
576 rpcrdma_remove_req(struct rpcrdma_buffer *buffers, struct rpcrdma_req *req)
577 {
578         spin_lock(&buffers->rb_lock);
579         list_del(&req->rl_list);
580         spin_unlock(&buffers->rb_lock);
581 }
582 
583 struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *);
584 void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *);
585 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
586 void rpcrdma_buffer_put(struct rpcrdma_req *);
587 void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
588 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
589 
590 void rpcrdma_defer_mr_recovery(struct rpcrdma_mw *);
591 
592 struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(size_t, enum dma_data_direction,
593                                             gfp_t);
594 bool __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *, struct rpcrdma_regbuf *);
595 void rpcrdma_free_regbuf(struct rpcrdma_regbuf *);
596 
597 static inline bool
598 rpcrdma_regbuf_is_mapped(struct rpcrdma_regbuf *rb)
599 {
600         return rb->rg_device != NULL;
601 }
602 
603 static inline bool
604 rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
605 {
606         if (likely(rpcrdma_regbuf_is_mapped(rb)))
607                 return true;
608         return __rpcrdma_dma_map_regbuf(ia, rb);
609 }
610 
611 int rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *, unsigned int);
612 
613 int rpcrdma_alloc_wq(void);
614 void rpcrdma_destroy_wq(void);
615 
616 /*
617  * Wrappers for chunk registration, shared by read/write chunk code.
618  */
619 
620 static inline enum dma_data_direction
621 rpcrdma_data_dir(bool writing)
622 {
623         return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
624 }
625 
626 /*
627  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
628  */
629 
630 enum rpcrdma_chunktype {
631         rpcrdma_noch = 0,
632         rpcrdma_readch,
633         rpcrdma_areadch,
634         rpcrdma_writech,
635         rpcrdma_replych
636 };
637 
638 bool rpcrdma_prepare_send_sges(struct rpcrdma_ia *, struct rpcrdma_req *,
639                                u32, struct xdr_buf *, enum rpcrdma_chunktype);
640 void rpcrdma_unmap_sges(struct rpcrdma_ia *, struct rpcrdma_req *);
641 int rpcrdma_marshal_req(struct rpc_rqst *);
642 void rpcrdma_set_max_header_sizes(struct rpcrdma_xprt *);
643 void rpcrdma_reply_handler(struct work_struct *work);
644 
645 /* RPC/RDMA module init - xprtrdma/transport.c
646  */
647 extern unsigned int xprt_rdma_max_inline_read;
648 void xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap);
649 void xprt_rdma_free_addresses(struct rpc_xprt *xprt);
650 void rpcrdma_connect_worker(struct work_struct *work);
651 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq);
652 int xprt_rdma_init(void);
653 void xprt_rdma_cleanup(void);
654 
655 /* Backchannel calls - xprtrdma/backchannel.c
656  */
657 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
658 int xprt_rdma_bc_setup(struct rpc_xprt *, unsigned int);
659 int xprt_rdma_bc_up(struct svc_serv *, struct net *);
660 size_t xprt_rdma_bc_maxpayload(struct rpc_xprt *);
661 int rpcrdma_bc_post_recv(struct rpcrdma_xprt *, unsigned int);
662 void rpcrdma_bc_receive_call(struct rpcrdma_xprt *, struct rpcrdma_rep *);
663 int rpcrdma_bc_marshal_reply(struct rpc_rqst *);
664 void xprt_rdma_bc_free_rqst(struct rpc_rqst *);
665 void xprt_rdma_bc_destroy(struct rpc_xprt *, unsigned int);
666 #endif  /* CONFIG_SUNRPC_BACKCHANNEL */
667 
668 extern struct xprt_class xprt_rdma_bc;
669 
670 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
671 

~ [ 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