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f58851e6 TT |
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 */ | |
60063497 | 45 | #include <linux/atomic.h> /* atomic_t, etc */ |
254f91e2 | 46 | #include <linux/workqueue.h> /* struct work_struct */ |
f58851e6 TT |
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 */ | |
7e5be288 | 54 | #include <linux/sunrpc/svc.h> /* RPCSVC_MAXPAYLOAD */ |
f58851e6 | 55 | |
5675add3 TT |
56 | #define RDMA_RESOLVE_TIMEOUT (5000) /* 5 seconds */ |
57 | #define RDMA_CONNECT_RETRY_MAX (2) /* retries if no listener backlog */ | |
58 | ||
f58851e6 TT |
59 | /* |
60 | * Interface Adapter -- one per transport instance | |
61 | */ | |
62 | struct rpcrdma_ia { | |
a0ce85f5 | 63 | const struct rpcrdma_memreg_ops *ri_ops; |
73806c88 | 64 | rwlock_t ri_qplock; |
89e0d112 | 65 | struct ib_device *ri_device; |
f58851e6 TT |
66 | struct rdma_cm_id *ri_id; |
67 | struct ib_pd *ri_pd; | |
68 | struct ib_mr *ri_bind_mem; | |
fe9053b3 TT |
69 | u32 ri_dma_lkey; |
70 | int ri_have_dma_lkey; | |
f58851e6 TT |
71 | struct completion ri_done; |
72 | int ri_async_rc; | |
0fc6c4e7 | 73 | unsigned int ri_max_frmr_depth; |
7bc7972c | 74 | struct ib_device_attr ri_devattr; |
ce1ab9ab CL |
75 | struct ib_qp_attr ri_qp_attr; |
76 | struct ib_qp_init_attr ri_qp_init_attr; | |
f58851e6 TT |
77 | }; |
78 | ||
79 | /* | |
80 | * RDMA Endpoint -- one per transport instance | |
81 | */ | |
82 | ||
8301a2c0 | 83 | #define RPCRDMA_WC_BUDGET (128) |
1c00dd07 CL |
84 | #define RPCRDMA_POLLSIZE (16) |
85 | ||
f58851e6 TT |
86 | struct rpcrdma_ep { |
87 | atomic_t rep_cqcount; | |
88 | int rep_cqinit; | |
89 | int rep_connected; | |
f58851e6 TT |
90 | struct ib_qp_init_attr rep_attr; |
91 | wait_queue_head_t rep_connect_wait; | |
c05fbb5a | 92 | struct rpcrdma_regbuf *rep_padbuf; |
f58851e6 TT |
93 | struct rdma_conn_param rep_remote_cma; |
94 | struct sockaddr_storage rep_remote_addr; | |
254f91e2 | 95 | struct delayed_work rep_connect_worker; |
1c00dd07 CL |
96 | struct ib_wc rep_send_wcs[RPCRDMA_POLLSIZE]; |
97 | struct ib_wc rep_recv_wcs[RPCRDMA_POLLSIZE]; | |
f58851e6 TT |
98 | }; |
99 | ||
e7104a2a CL |
100 | /* |
101 | * Force a signaled SEND Work Request every so often, | |
102 | * in case the provider needs to do some housekeeping. | |
103 | */ | |
104 | #define RPCRDMA_MAX_UNSIGNALED_SENDS (32) | |
105 | ||
f58851e6 TT |
106 | #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit) |
107 | #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount) | |
108 | ||
e46ac34c CL |
109 | /* Force completion handler to ignore the signal |
110 | */ | |
111 | #define RPCRDMA_IGNORE_COMPLETION (0ULL) | |
112 | ||
9128c3e7 CL |
113 | /* Registered buffer -- registered kmalloc'd memory for RDMA SEND/RECV |
114 | * | |
115 | * The below structure appears at the front of a large region of kmalloc'd | |
116 | * memory, which always starts on a good alignment boundary. | |
117 | */ | |
118 | ||
119 | struct rpcrdma_regbuf { | |
120 | size_t rg_size; | |
121 | struct rpcrdma_req *rg_owner; | |
122 | struct ib_mr *rg_mr; | |
123 | struct ib_sge rg_iov; | |
124 | __be32 rg_base[0] __attribute__ ((aligned(256))); | |
125 | }; | |
126 | ||
127 | static inline u64 | |
128 | rdmab_addr(struct rpcrdma_regbuf *rb) | |
129 | { | |
130 | return rb->rg_iov.addr; | |
131 | } | |
132 | ||
133 | static inline u32 | |
134 | rdmab_length(struct rpcrdma_regbuf *rb) | |
135 | { | |
136 | return rb->rg_iov.length; | |
137 | } | |
138 | ||
139 | static inline u32 | |
140 | rdmab_lkey(struct rpcrdma_regbuf *rb) | |
141 | { | |
142 | return rb->rg_iov.lkey; | |
143 | } | |
144 | ||
145 | static inline struct rpcrdma_msg * | |
146 | rdmab_to_msg(struct rpcrdma_regbuf *rb) | |
147 | { | |
148 | return (struct rpcrdma_msg *)rb->rg_base; | |
149 | } | |
150 | ||
f58851e6 TT |
151 | /* |
152 | * struct rpcrdma_rep -- this structure encapsulates state required to recv | |
153 | * and complete a reply, asychronously. It needs several pieces of | |
154 | * state: | |
155 | * o recv buffer (posted to provider) | |
156 | * o ib_sge (also donated to provider) | |
157 | * o status of reply (length, success or not) | |
158 | * o bookkeeping state to get run by tasklet (list, etc) | |
159 | * | |
160 | * These are allocated during initialization, per-transport instance; | |
161 | * however, the tasklet execution list itself is global, as it should | |
162 | * always be pretty short. | |
163 | * | |
164 | * N of these are associated with a transport instance, and stored in | |
165 | * struct rpcrdma_buffer. N is the max number of outstanding requests. | |
166 | */ | |
167 | ||
168 | /* temporary static scatter/gather max */ | |
2773395b | 169 | #define RPCRDMA_MAX_DATA_SEGS (64) /* max scatter/gather */ |
f58851e6 | 170 | #define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */ |
f58851e6 TT |
171 | |
172 | struct rpcrdma_buffer; | |
173 | ||
174 | struct rpcrdma_rep { | |
6b1184cd | 175 | unsigned int rr_len; |
89e0d112 | 176 | struct ib_device *rr_device; |
fed171b3 | 177 | struct rpcrdma_xprt *rr_rxprt; |
6b1184cd CL |
178 | struct list_head rr_list; |
179 | struct rpcrdma_regbuf *rr_rdmabuf; | |
f58851e6 TT |
180 | }; |
181 | ||
0dbb4108 CL |
182 | /* |
183 | * struct rpcrdma_mw - external memory region metadata | |
184 | * | |
185 | * An external memory region is any buffer or page that is registered | |
186 | * on the fly (ie, not pre-registered). | |
187 | * | |
3111d72c | 188 | * Each rpcrdma_buffer has a list of free MWs anchored in rb_mws. During |
0dbb4108 CL |
189 | * call_allocate, rpcrdma_buffer_get() assigns one to each segment in |
190 | * an rpcrdma_req. Then rpcrdma_register_external() grabs these to keep | |
191 | * track of registration metadata while each RPC is pending. | |
192 | * rpcrdma_deregister_external() uses this metadata to unmap and | |
193 | * release these resources when an RPC is complete. | |
194 | */ | |
195 | enum rpcrdma_frmr_state { | |
196 | FRMR_IS_INVALID, /* ready to be used */ | |
197 | FRMR_IS_VALID, /* in use */ | |
9f9d802a | 198 | FRMR_IS_STALE, /* failed completion */ |
0dbb4108 CL |
199 | }; |
200 | ||
201 | struct rpcrdma_frmr { | |
202 | struct ib_fast_reg_page_list *fr_pgl; | |
203 | struct ib_mr *fr_mr; | |
204 | enum rpcrdma_frmr_state fr_state; | |
951e721c CL |
205 | struct work_struct fr_work; |
206 | struct rpcrdma_xprt *fr_xprt; | |
0dbb4108 CL |
207 | }; |
208 | ||
209 | struct rpcrdma_mw { | |
210 | union { | |
211 | struct ib_fmr *fmr; | |
212 | struct rpcrdma_frmr frmr; | |
213 | } r; | |
e46ac34c | 214 | void (*mw_sendcompletion)(struct ib_wc *); |
0dbb4108 | 215 | struct list_head mw_list; |
3111d72c | 216 | struct list_head mw_all; |
0dbb4108 CL |
217 | }; |
218 | ||
f58851e6 TT |
219 | /* |
220 | * struct rpcrdma_req -- structure central to the request/reply sequence. | |
221 | * | |
222 | * N of these are associated with a transport instance, and stored in | |
223 | * struct rpcrdma_buffer. N is the max number of outstanding requests. | |
224 | * | |
225 | * It includes pre-registered buffer memory for send AND recv. | |
226 | * The recv buffer, however, is not owned by this structure, and | |
227 | * is "donated" to the hardware when a recv is posted. When a | |
228 | * reply is handled, the recv buffer used is given back to the | |
229 | * struct rpcrdma_req associated with the request. | |
230 | * | |
231 | * In addition to the basic memory, this structure includes an array | |
232 | * of iovs for send operations. The reason is that the iovs passed to | |
233 | * ib_post_{send,recv} must not be modified until the work request | |
234 | * completes. | |
235 | * | |
236 | * NOTES: | |
237 | * o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we | |
238 | * marshal. The number needed varies depending on the iov lists that | |
239 | * are passed to us, the memory registration mode we are in, and if | |
240 | * physical addressing is used, the layout. | |
241 | */ | |
242 | ||
243 | struct rpcrdma_mr_seg { /* chunk descriptors */ | |
3eb35810 | 244 | struct rpcrdma_mw *rl_mw; /* registered MR */ |
f58851e6 TT |
245 | u64 mr_base; /* registration result */ |
246 | u32 mr_rkey; /* registration result */ | |
247 | u32 mr_len; /* length of chunk or segment */ | |
248 | int mr_nsegs; /* number of segments in chunk or 0 */ | |
249 | enum dma_data_direction mr_dir; /* segment mapping direction */ | |
250 | dma_addr_t mr_dma; /* segment mapping address */ | |
251 | size_t mr_dmalen; /* segment mapping length */ | |
252 | struct page *mr_page; /* owning page, if any */ | |
253 | char *mr_offset; /* kva if no page, else offset */ | |
254 | }; | |
255 | ||
256 | struct rpcrdma_req { | |
f58851e6 TT |
257 | unsigned int rl_niovs; /* 0, 2 or 4 */ |
258 | unsigned int rl_nchunks; /* non-zero if chunks */ | |
575448bd | 259 | unsigned int rl_connect_cookie; /* retry detection */ |
f58851e6 TT |
260 | struct rpcrdma_buffer *rl_buffer; /* home base for this structure */ |
261 | struct rpcrdma_rep *rl_reply;/* holder for reply buffer */ | |
f58851e6 | 262 | struct ib_sge rl_send_iov[4]; /* for active requests */ |
85275c87 | 263 | struct rpcrdma_regbuf *rl_rdmabuf; |
0ca77dc3 | 264 | struct rpcrdma_regbuf *rl_sendbuf; |
85275c87 | 265 | struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS]; |
f58851e6 | 266 | }; |
0ca77dc3 CL |
267 | |
268 | static inline struct rpcrdma_req * | |
269 | rpcr_to_rdmar(struct rpc_rqst *rqst) | |
270 | { | |
b625a616 CL |
271 | void *buffer = rqst->rq_buffer; |
272 | struct rpcrdma_regbuf *rb; | |
273 | ||
274 | rb = container_of(buffer, struct rpcrdma_regbuf, rg_base); | |
0ca77dc3 CL |
275 | return rb->rg_owner; |
276 | } | |
f58851e6 TT |
277 | |
278 | /* | |
279 | * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for | |
280 | * inline requests/replies, and client/server credits. | |
281 | * | |
282 | * One of these is associated with a transport instance | |
283 | */ | |
284 | struct rpcrdma_buffer { | |
58d1dcf5 CL |
285 | spinlock_t rb_mwlock; /* protect rb_mws list */ |
286 | struct list_head rb_mws; | |
287 | struct list_head rb_all; | |
288 | char *rb_pool; | |
289 | ||
290 | spinlock_t rb_lock; /* protect buf arrays */ | |
291 | u32 rb_max_requests; | |
292 | int rb_send_index; | |
293 | int rb_recv_index; | |
f58851e6 | 294 | struct rpcrdma_req **rb_send_bufs; |
f58851e6 | 295 | struct rpcrdma_rep **rb_recv_bufs; |
f58851e6 TT |
296 | }; |
297 | #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) | |
298 | ||
299 | /* | |
300 | * Internal structure for transport instance creation. This | |
301 | * exists primarily for modularity. | |
302 | * | |
303 | * This data should be set with mount options | |
304 | */ | |
305 | struct rpcrdma_create_data_internal { | |
306 | struct sockaddr_storage addr; /* RDMA server address */ | |
307 | unsigned int max_requests; /* max requests (slots) in flight */ | |
308 | unsigned int rsize; /* mount rsize - max read hdr+data */ | |
309 | unsigned int wsize; /* mount wsize - max write hdr+data */ | |
310 | unsigned int inline_rsize; /* max non-rdma read data payload */ | |
311 | unsigned int inline_wsize; /* max non-rdma write data payload */ | |
312 | unsigned int padding; /* non-rdma write header padding */ | |
313 | }; | |
314 | ||
315 | #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \ | |
a4f0835c | 316 | (rpcx_to_rdmad(rq->rq_xprt).inline_rsize) |
f58851e6 TT |
317 | |
318 | #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\ | |
a4f0835c | 319 | (rpcx_to_rdmad(rq->rq_xprt).inline_wsize) |
f58851e6 TT |
320 | |
321 | #define RPCRDMA_INLINE_PAD_VALUE(rq)\ | |
a4f0835c | 322 | rpcx_to_rdmad(rq->rq_xprt).padding |
f58851e6 TT |
323 | |
324 | /* | |
325 | * Statistics for RPCRDMA | |
326 | */ | |
327 | struct rpcrdma_stats { | |
328 | unsigned long read_chunk_count; | |
329 | unsigned long write_chunk_count; | |
330 | unsigned long reply_chunk_count; | |
331 | ||
332 | unsigned long long total_rdma_request; | |
333 | unsigned long long total_rdma_reply; | |
334 | ||
335 | unsigned long long pullup_copy_count; | |
336 | unsigned long long fixup_copy_count; | |
337 | unsigned long hardway_register_count; | |
338 | unsigned long failed_marshal_count; | |
339 | unsigned long bad_reply_count; | |
340 | }; | |
341 | ||
a0ce85f5 CL |
342 | /* |
343 | * Per-registration mode operations | |
344 | */ | |
1c9351ee | 345 | struct rpcrdma_xprt; |
a0ce85f5 | 346 | struct rpcrdma_memreg_ops { |
9c1b4d77 CL |
347 | int (*ro_map)(struct rpcrdma_xprt *, |
348 | struct rpcrdma_mr_seg *, int, bool); | |
6814baea CL |
349 | int (*ro_unmap)(struct rpcrdma_xprt *, |
350 | struct rpcrdma_mr_seg *); | |
3968cb58 CL |
351 | int (*ro_open)(struct rpcrdma_ia *, |
352 | struct rpcrdma_ep *, | |
353 | struct rpcrdma_create_data_internal *); | |
1c9351ee | 354 | size_t (*ro_maxpages)(struct rpcrdma_xprt *); |
91e70e70 | 355 | int (*ro_init)(struct rpcrdma_xprt *); |
4561f347 | 356 | void (*ro_destroy)(struct rpcrdma_buffer *); |
a0ce85f5 CL |
357 | const char *ro_displayname; |
358 | }; | |
359 | ||
360 | extern const struct rpcrdma_memreg_ops rpcrdma_fmr_memreg_ops; | |
361 | extern const struct rpcrdma_memreg_ops rpcrdma_frwr_memreg_ops; | |
362 | extern const struct rpcrdma_memreg_ops rpcrdma_physical_memreg_ops; | |
363 | ||
f58851e6 TT |
364 | /* |
365 | * RPCRDMA transport -- encapsulates the structures above for | |
366 | * integration with RPC. | |
367 | * | |
368 | * The contained structures are embedded, not pointers, | |
369 | * for convenience. This structure need not be visible externally. | |
370 | * | |
371 | * It is allocated and initialized during mount, and released | |
372 | * during unmount. | |
373 | */ | |
374 | struct rpcrdma_xprt { | |
5abefb86 | 375 | struct rpc_xprt rx_xprt; |
f58851e6 TT |
376 | struct rpcrdma_ia rx_ia; |
377 | struct rpcrdma_ep rx_ep; | |
378 | struct rpcrdma_buffer rx_buf; | |
379 | struct rpcrdma_create_data_internal rx_data; | |
5abefb86 | 380 | struct delayed_work rx_connect_worker; |
f58851e6 TT |
381 | struct rpcrdma_stats rx_stats; |
382 | }; | |
383 | ||
5abefb86 | 384 | #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, rx_xprt) |
f58851e6 TT |
385 | #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) |
386 | ||
9191ca3b TT |
387 | /* Setting this to 0 ensures interoperability with early servers. |
388 | * Setting this to 1 enhances certain unaligned read/write performance. | |
389 | * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */ | |
390 | extern int xprt_rdma_pad_optimize; | |
391 | ||
f58851e6 TT |
392 | /* |
393 | * Interface Adapter calls - xprtrdma/verbs.c | |
394 | */ | |
395 | int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int); | |
396 | void rpcrdma_ia_close(struct rpcrdma_ia *); | |
397 | ||
398 | /* | |
399 | * Endpoint calls - xprtrdma/verbs.c | |
400 | */ | |
401 | int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, | |
402 | struct rpcrdma_create_data_internal *); | |
7f1d5419 | 403 | void rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); |
f58851e6 | 404 | int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); |
282191cb | 405 | void rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); |
f58851e6 TT |
406 | |
407 | int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, | |
408 | struct rpcrdma_req *); | |
409 | int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *, | |
410 | struct rpcrdma_rep *); | |
411 | ||
412 | /* | |
413 | * Buffer calls - xprtrdma/verbs.c | |
414 | */ | |
ac920d04 | 415 | int rpcrdma_buffer_create(struct rpcrdma_xprt *); |
f58851e6 TT |
416 | void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); |
417 | ||
346aa66b CL |
418 | struct rpcrdma_mw *rpcrdma_get_mw(struct rpcrdma_xprt *); |
419 | void rpcrdma_put_mw(struct rpcrdma_xprt *, struct rpcrdma_mw *); | |
f58851e6 TT |
420 | struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); |
421 | void rpcrdma_buffer_put(struct rpcrdma_req *); | |
422 | void rpcrdma_recv_buffer_get(struct rpcrdma_req *); | |
423 | void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); | |
424 | ||
9128c3e7 CL |
425 | struct rpcrdma_regbuf *rpcrdma_alloc_regbuf(struct rpcrdma_ia *, |
426 | size_t, gfp_t); | |
427 | void rpcrdma_free_regbuf(struct rpcrdma_ia *, | |
428 | struct rpcrdma_regbuf *); | |
429 | ||
1c9351ee | 430 | unsigned int rpcrdma_max_segments(struct rpcrdma_xprt *); |
d654788e | 431 | |
951e721c CL |
432 | int frwr_alloc_recovery_wq(void); |
433 | void frwr_destroy_recovery_wq(void); | |
434 | ||
d654788e CL |
435 | /* |
436 | * Wrappers for chunk registration, shared by read/write chunk code. | |
437 | */ | |
438 | ||
439 | void rpcrdma_mapping_error(struct rpcrdma_mr_seg *); | |
440 | ||
441 | static inline enum dma_data_direction | |
442 | rpcrdma_data_dir(bool writing) | |
443 | { | |
444 | return writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
445 | } | |
446 | ||
447 | static inline void | |
448 | rpcrdma_map_one(struct ib_device *device, struct rpcrdma_mr_seg *seg, | |
449 | enum dma_data_direction direction) | |
450 | { | |
451 | seg->mr_dir = direction; | |
452 | seg->mr_dmalen = seg->mr_len; | |
453 | ||
454 | if (seg->mr_page) | |
455 | seg->mr_dma = ib_dma_map_page(device, | |
456 | seg->mr_page, offset_in_page(seg->mr_offset), | |
457 | seg->mr_dmalen, seg->mr_dir); | |
458 | else | |
459 | seg->mr_dma = ib_dma_map_single(device, | |
460 | seg->mr_offset, | |
461 | seg->mr_dmalen, seg->mr_dir); | |
462 | ||
463 | if (ib_dma_mapping_error(device, seg->mr_dma)) | |
464 | rpcrdma_mapping_error(seg); | |
465 | } | |
466 | ||
467 | static inline void | |
468 | rpcrdma_unmap_one(struct ib_device *device, struct rpcrdma_mr_seg *seg) | |
469 | { | |
470 | if (seg->mr_page) | |
471 | ib_dma_unmap_page(device, | |
472 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
473 | else | |
474 | ib_dma_unmap_single(device, | |
475 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
476 | } | |
1c9351ee | 477 | |
f58851e6 TT |
478 | /* |
479 | * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c | |
480 | */ | |
254f91e2 | 481 | void rpcrdma_connect_worker(struct work_struct *); |
f58851e6 TT |
482 | void rpcrdma_conn_func(struct rpcrdma_ep *); |
483 | void rpcrdma_reply_handler(struct rpcrdma_rep *); | |
484 | ||
485 | /* | |
486 | * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c | |
487 | */ | |
488 | int rpcrdma_marshal_req(struct rpc_rqst *); | |
489 | ||
cec56c8f TT |
490 | /* Temporary NFS request map cache. Created in svc_rdma.c */ |
491 | extern struct kmem_cache *svc_rdma_map_cachep; | |
492 | /* WR context cache. Created in svc_rdma.c */ | |
493 | extern struct kmem_cache *svc_rdma_ctxt_cachep; | |
494 | /* Workqueue created in svc_rdma.c */ | |
495 | extern struct workqueue_struct *svc_rdma_wq; | |
496 | ||
7e5be288 SW |
497 | #if RPCSVC_MAXPAYLOAD < (RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT) |
498 | #define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD | |
499 | #else | |
500 | #define RPCSVC_MAXPAYLOAD_RDMA (RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT) | |
501 | #endif | |
502 | ||
f58851e6 | 503 | #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ |