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1 | /* |
2 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the BSD-type | |
8 | * license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * | |
17 | * Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials provided | |
20 | * with the distribution. | |
21 | * | |
22 | * Neither the name of the Network Appliance, Inc. nor the names of | |
23 | * its contributors may be used to endorse or promote products | |
24 | * derived from this software without specific prior written | |
25 | * permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
38 | */ | |
39 | ||
40 | #ifndef _LINUX_SUNRPC_XPRT_RDMA_H | |
41 | #define _LINUX_SUNRPC_XPRT_RDMA_H | |
42 | ||
43 | #include <linux/wait.h> /* wait_queue_head_t, etc */ | |
44 | #include <linux/spinlock.h> /* spinlock_t, etc */ | |
45 | #include <asm/atomic.h> /* atomic_t, etc */ | |
46 | ||
47 | #include <rdma/rdma_cm.h> /* RDMA connection api */ | |
48 | #include <rdma/ib_verbs.h> /* RDMA verbs api */ | |
49 | ||
50 | #include <linux/sunrpc/clnt.h> /* rpc_xprt */ | |
51 | #include <linux/sunrpc/rpc_rdma.h> /* RPC/RDMA protocol */ | |
52 | #include <linux/sunrpc/xprtrdma.h> /* xprt parameters */ | |
53 | ||
54 | /* | |
55 | * Interface Adapter -- one per transport instance | |
56 | */ | |
57 | struct rpcrdma_ia { | |
58 | struct rdma_cm_id *ri_id; | |
59 | struct ib_pd *ri_pd; | |
60 | struct ib_mr *ri_bind_mem; | |
61 | struct completion ri_done; | |
62 | int ri_async_rc; | |
63 | enum rpcrdma_memreg ri_memreg_strategy; | |
64 | }; | |
65 | ||
66 | /* | |
67 | * RDMA Endpoint -- one per transport instance | |
68 | */ | |
69 | ||
70 | struct rpcrdma_ep { | |
71 | atomic_t rep_cqcount; | |
72 | int rep_cqinit; | |
73 | int rep_connected; | |
74 | struct rpcrdma_ia *rep_ia; | |
75 | struct ib_cq *rep_cq; | |
76 | struct ib_qp_init_attr rep_attr; | |
77 | wait_queue_head_t rep_connect_wait; | |
78 | struct ib_sge rep_pad; /* holds zeroed pad */ | |
79 | struct ib_mr *rep_pad_mr; /* holds zeroed pad */ | |
80 | void (*rep_func)(struct rpcrdma_ep *); | |
81 | struct rpc_xprt *rep_xprt; /* for rep_func */ | |
82 | struct rdma_conn_param rep_remote_cma; | |
83 | struct sockaddr_storage rep_remote_addr; | |
84 | }; | |
85 | ||
86 | #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit) | |
87 | #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount) | |
88 | ||
89 | /* | |
90 | * struct rpcrdma_rep -- this structure encapsulates state required to recv | |
91 | * and complete a reply, asychronously. It needs several pieces of | |
92 | * state: | |
93 | * o recv buffer (posted to provider) | |
94 | * o ib_sge (also donated to provider) | |
95 | * o status of reply (length, success or not) | |
96 | * o bookkeeping state to get run by tasklet (list, etc) | |
97 | * | |
98 | * These are allocated during initialization, per-transport instance; | |
99 | * however, the tasklet execution list itself is global, as it should | |
100 | * always be pretty short. | |
101 | * | |
102 | * N of these are associated with a transport instance, and stored in | |
103 | * struct rpcrdma_buffer. N is the max number of outstanding requests. | |
104 | */ | |
105 | ||
106 | /* temporary static scatter/gather max */ | |
107 | #define RPCRDMA_MAX_DATA_SEGS (8) /* max scatter/gather */ | |
108 | #define RPCRDMA_MAX_SEGS (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */ | |
109 | #define MAX_RPCRDMAHDR (\ | |
110 | /* max supported RPC/RDMA header */ \ | |
111 | sizeof(struct rpcrdma_msg) + (2 * sizeof(u32)) + \ | |
112 | (sizeof(struct rpcrdma_read_chunk) * RPCRDMA_MAX_SEGS) + sizeof(u32)) | |
113 | ||
114 | struct rpcrdma_buffer; | |
115 | ||
116 | struct rpcrdma_rep { | |
117 | unsigned int rr_len; /* actual received reply length */ | |
118 | struct rpcrdma_buffer *rr_buffer; /* home base for this structure */ | |
119 | struct rpc_xprt *rr_xprt; /* needed for request/reply matching */ | |
120 | void (*rr_func)(struct rpcrdma_rep *);/* called by tasklet in softint */ | |
121 | struct list_head rr_list; /* tasklet list */ | |
122 | wait_queue_head_t rr_unbind; /* optional unbind wait */ | |
123 | struct ib_sge rr_iov; /* for posting */ | |
124 | struct ib_mr *rr_handle; /* handle for mem in rr_iov */ | |
125 | char rr_base[MAX_RPCRDMAHDR]; /* minimal inline receive buffer */ | |
126 | }; | |
127 | ||
128 | /* | |
129 | * struct rpcrdma_req -- structure central to the request/reply sequence. | |
130 | * | |
131 | * N of these are associated with a transport instance, and stored in | |
132 | * struct rpcrdma_buffer. N is the max number of outstanding requests. | |
133 | * | |
134 | * It includes pre-registered buffer memory for send AND recv. | |
135 | * The recv buffer, however, is not owned by this structure, and | |
136 | * is "donated" to the hardware when a recv is posted. When a | |
137 | * reply is handled, the recv buffer used is given back to the | |
138 | * struct rpcrdma_req associated with the request. | |
139 | * | |
140 | * In addition to the basic memory, this structure includes an array | |
141 | * of iovs for send operations. The reason is that the iovs passed to | |
142 | * ib_post_{send,recv} must not be modified until the work request | |
143 | * completes. | |
144 | * | |
145 | * NOTES: | |
146 | * o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we | |
147 | * marshal. The number needed varies depending on the iov lists that | |
148 | * are passed to us, the memory registration mode we are in, and if | |
149 | * physical addressing is used, the layout. | |
150 | */ | |
151 | ||
152 | struct rpcrdma_mr_seg { /* chunk descriptors */ | |
153 | union { /* chunk memory handles */ | |
154 | struct ib_mr *rl_mr; /* if registered directly */ | |
155 | struct rpcrdma_mw { /* if registered from region */ | |
156 | union { | |
157 | struct ib_mw *mw; | |
158 | struct ib_fmr *fmr; | |
159 | } r; | |
160 | struct list_head mw_list; | |
161 | } *rl_mw; | |
162 | } mr_chunk; | |
163 | u64 mr_base; /* registration result */ | |
164 | u32 mr_rkey; /* registration result */ | |
165 | u32 mr_len; /* length of chunk or segment */ | |
166 | int mr_nsegs; /* number of segments in chunk or 0 */ | |
167 | enum dma_data_direction mr_dir; /* segment mapping direction */ | |
168 | dma_addr_t mr_dma; /* segment mapping address */ | |
169 | size_t mr_dmalen; /* segment mapping length */ | |
170 | struct page *mr_page; /* owning page, if any */ | |
171 | char *mr_offset; /* kva if no page, else offset */ | |
172 | }; | |
173 | ||
174 | struct rpcrdma_req { | |
175 | size_t rl_size; /* actual length of buffer */ | |
176 | unsigned int rl_niovs; /* 0, 2 or 4 */ | |
177 | unsigned int rl_nchunks; /* non-zero if chunks */ | |
178 | struct rpcrdma_buffer *rl_buffer; /* home base for this structure */ | |
179 | struct rpcrdma_rep *rl_reply;/* holder for reply buffer */ | |
180 | struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];/* chunk segments */ | |
181 | struct ib_sge rl_send_iov[4]; /* for active requests */ | |
182 | struct ib_sge rl_iov; /* for posting */ | |
183 | struct ib_mr *rl_handle; /* handle for mem in rl_iov */ | |
184 | char rl_base[MAX_RPCRDMAHDR]; /* start of actual buffer */ | |
185 | __u32 rl_xdr_buf[0]; /* start of returned rpc rq_buffer */ | |
186 | }; | |
187 | #define rpcr_to_rdmar(r) \ | |
188 | container_of((r)->rq_buffer, struct rpcrdma_req, rl_xdr_buf[0]) | |
189 | ||
190 | /* | |
191 | * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for | |
192 | * inline requests/replies, and client/server credits. | |
193 | * | |
194 | * One of these is associated with a transport instance | |
195 | */ | |
196 | struct rpcrdma_buffer { | |
197 | spinlock_t rb_lock; /* protects indexes */ | |
198 | atomic_t rb_credits; /* most recent server credits */ | |
199 | unsigned long rb_cwndscale; /* cached framework rpc_cwndscale */ | |
200 | int rb_max_requests;/* client max requests */ | |
201 | struct list_head rb_mws; /* optional memory windows/fmrs */ | |
202 | int rb_send_index; | |
203 | struct rpcrdma_req **rb_send_bufs; | |
204 | int rb_recv_index; | |
205 | struct rpcrdma_rep **rb_recv_bufs; | |
206 | char *rb_pool; | |
207 | }; | |
208 | #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia) | |
209 | ||
210 | /* | |
211 | * Internal structure for transport instance creation. This | |
212 | * exists primarily for modularity. | |
213 | * | |
214 | * This data should be set with mount options | |
215 | */ | |
216 | struct rpcrdma_create_data_internal { | |
217 | struct sockaddr_storage addr; /* RDMA server address */ | |
218 | unsigned int max_requests; /* max requests (slots) in flight */ | |
219 | unsigned int rsize; /* mount rsize - max read hdr+data */ | |
220 | unsigned int wsize; /* mount wsize - max write hdr+data */ | |
221 | unsigned int inline_rsize; /* max non-rdma read data payload */ | |
222 | unsigned int inline_wsize; /* max non-rdma write data payload */ | |
223 | unsigned int padding; /* non-rdma write header padding */ | |
224 | }; | |
225 | ||
226 | #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \ | |
227 | (rpcx_to_rdmad(rq->rq_task->tk_xprt).inline_rsize) | |
228 | ||
229 | #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\ | |
230 | (rpcx_to_rdmad(rq->rq_task->tk_xprt).inline_wsize) | |
231 | ||
232 | #define RPCRDMA_INLINE_PAD_VALUE(rq)\ | |
233 | rpcx_to_rdmad(rq->rq_task->tk_xprt).padding | |
234 | ||
235 | /* | |
236 | * Statistics for RPCRDMA | |
237 | */ | |
238 | struct rpcrdma_stats { | |
239 | unsigned long read_chunk_count; | |
240 | unsigned long write_chunk_count; | |
241 | unsigned long reply_chunk_count; | |
242 | ||
243 | unsigned long long total_rdma_request; | |
244 | unsigned long long total_rdma_reply; | |
245 | ||
246 | unsigned long long pullup_copy_count; | |
247 | unsigned long long fixup_copy_count; | |
248 | unsigned long hardway_register_count; | |
249 | unsigned long failed_marshal_count; | |
250 | unsigned long bad_reply_count; | |
251 | }; | |
252 | ||
253 | /* | |
254 | * RPCRDMA transport -- encapsulates the structures above for | |
255 | * integration with RPC. | |
256 | * | |
257 | * The contained structures are embedded, not pointers, | |
258 | * for convenience. This structure need not be visible externally. | |
259 | * | |
260 | * It is allocated and initialized during mount, and released | |
261 | * during unmount. | |
262 | */ | |
263 | struct rpcrdma_xprt { | |
264 | struct rpc_xprt xprt; | |
265 | struct rpcrdma_ia rx_ia; | |
266 | struct rpcrdma_ep rx_ep; | |
267 | struct rpcrdma_buffer rx_buf; | |
268 | struct rpcrdma_create_data_internal rx_data; | |
269 | struct delayed_work rdma_connect; | |
270 | struct rpcrdma_stats rx_stats; | |
271 | }; | |
272 | ||
273 | #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, xprt) | |
274 | #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data) | |
275 | ||
276 | /* | |
277 | * Interface Adapter calls - xprtrdma/verbs.c | |
278 | */ | |
279 | int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int); | |
280 | void rpcrdma_ia_close(struct rpcrdma_ia *); | |
281 | ||
282 | /* | |
283 | * Endpoint calls - xprtrdma/verbs.c | |
284 | */ | |
285 | int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *, | |
286 | struct rpcrdma_create_data_internal *); | |
287 | int rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *); | |
288 | int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *); | |
289 | int rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *); | |
290 | ||
291 | int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *, | |
292 | struct rpcrdma_req *); | |
293 | int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *, | |
294 | struct rpcrdma_rep *); | |
295 | ||
296 | /* | |
297 | * Buffer calls - xprtrdma/verbs.c | |
298 | */ | |
299 | int rpcrdma_buffer_create(struct rpcrdma_buffer *, struct rpcrdma_ep *, | |
300 | struct rpcrdma_ia *, | |
301 | struct rpcrdma_create_data_internal *); | |
302 | void rpcrdma_buffer_destroy(struct rpcrdma_buffer *); | |
303 | ||
304 | struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *); | |
305 | void rpcrdma_buffer_put(struct rpcrdma_req *); | |
306 | void rpcrdma_recv_buffer_get(struct rpcrdma_req *); | |
307 | void rpcrdma_recv_buffer_put(struct rpcrdma_rep *); | |
308 | ||
309 | int rpcrdma_register_internal(struct rpcrdma_ia *, void *, int, | |
310 | struct ib_mr **, struct ib_sge *); | |
311 | int rpcrdma_deregister_internal(struct rpcrdma_ia *, | |
312 | struct ib_mr *, struct ib_sge *); | |
313 | ||
314 | int rpcrdma_register_external(struct rpcrdma_mr_seg *, | |
315 | int, int, struct rpcrdma_xprt *); | |
316 | int rpcrdma_deregister_external(struct rpcrdma_mr_seg *, | |
317 | struct rpcrdma_xprt *, void *); | |
318 | ||
319 | /* | |
320 | * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c | |
321 | */ | |
322 | void rpcrdma_conn_func(struct rpcrdma_ep *); | |
323 | void rpcrdma_reply_handler(struct rpcrdma_rep *); | |
324 | ||
325 | /* | |
326 | * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c | |
327 | */ | |
328 | int rpcrdma_marshal_req(struct rpc_rqst *); | |
329 | ||
330 | #endif /* _LINUX_SUNRPC_XPRT_RDMA_H */ |