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Linux/net/sunrpc/xprtrdma/xprt_rdma.h

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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 <linux/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 #define RDMA_RESOLVE_TIMEOUT    (5000)  /* 5 seconds */
 55 #define RDMA_CONNECT_RETRY_MAX  (2)     /* retries if no listener backlog */
 56 
 57 /*
 58  * Interface Adapter -- one per transport instance
 59  */
 60 struct rpcrdma_ia {
 61         struct rdma_cm_id       *ri_id;
 62         struct ib_pd            *ri_pd;
 63         struct ib_mr            *ri_bind_mem;
 64         u32                     ri_dma_lkey;
 65         int                     ri_have_dma_lkey;
 66         struct completion       ri_done;
 67         int                     ri_async_rc;
 68         enum rpcrdma_memreg     ri_memreg_strategy;
 69 };
 70 
 71 /*
 72  * RDMA Endpoint -- one per transport instance
 73  */
 74 
 75 struct rpcrdma_ep {
 76         atomic_t                rep_cqcount;
 77         int                     rep_cqinit;
 78         int                     rep_connected;
 79         struct rpcrdma_ia       *rep_ia;
 80         struct ib_cq            *rep_cq;
 81         struct ib_qp_init_attr  rep_attr;
 82         wait_queue_head_t       rep_connect_wait;
 83         struct ib_sge           rep_pad;        /* holds zeroed pad */
 84         struct ib_mr            *rep_pad_mr;    /* holds zeroed pad */
 85         void                    (*rep_func)(struct rpcrdma_ep *);
 86         struct rpc_xprt         *rep_xprt;      /* for rep_func */
 87         struct rdma_conn_param  rep_remote_cma;
 88         struct sockaddr_storage rep_remote_addr;
 89 };
 90 
 91 #define INIT_CQCOUNT(ep) atomic_set(&(ep)->rep_cqcount, (ep)->rep_cqinit)
 92 #define DECR_CQCOUNT(ep) atomic_sub_return(1, &(ep)->rep_cqcount)
 93 
 94 /*
 95  * struct rpcrdma_rep -- this structure encapsulates state required to recv
 96  * and complete a reply, asychronously. It needs several pieces of
 97  * state:
 98  *   o recv buffer (posted to provider)
 99  *   o ib_sge (also donated to provider)
100  *   o status of reply (length, success or not)
101  *   o bookkeeping state to get run by tasklet (list, etc)
102  *
103  * These are allocated during initialization, per-transport instance;
104  * however, the tasklet execution list itself is global, as it should
105  * always be pretty short.
106  *
107  * N of these are associated with a transport instance, and stored in
108  * struct rpcrdma_buffer. N is the max number of outstanding requests.
109  */
110 
111 /* temporary static scatter/gather max */
112 #define RPCRDMA_MAX_DATA_SEGS   (64)    /* max scatter/gather */
113 #define RPCRDMA_MAX_SEGS        (RPCRDMA_MAX_DATA_SEGS + 2) /* head+tail = 2 */
114 #define MAX_RPCRDMAHDR  (\
115         /* max supported RPC/RDMA header */ \
116         sizeof(struct rpcrdma_msg) + (2 * sizeof(u32)) + \
117         (sizeof(struct rpcrdma_read_chunk) * RPCRDMA_MAX_SEGS) + sizeof(u32))
118 
119 struct rpcrdma_buffer;
120 
121 struct rpcrdma_rep {
122         unsigned int    rr_len;         /* actual received reply length */
123         struct rpcrdma_buffer *rr_buffer; /* home base for this structure */
124         struct rpc_xprt *rr_xprt;       /* needed for request/reply matching */
125         void (*rr_func)(struct rpcrdma_rep *);/* called by tasklet in softint */
126         struct list_head rr_list;       /* tasklet list */
127         wait_queue_head_t rr_unbind;    /* optional unbind wait */
128         struct ib_sge   rr_iov;         /* for posting */
129         struct ib_mr    *rr_handle;     /* handle for mem in rr_iov */
130         char    rr_base[MAX_RPCRDMAHDR]; /* minimal inline receive buffer */
131 };
132 
133 /*
134  * struct rpcrdma_req -- structure central to the request/reply sequence.
135  *
136  * N of these are associated with a transport instance, and stored in
137  * struct rpcrdma_buffer. N is the max number of outstanding requests.
138  *
139  * It includes pre-registered buffer memory for send AND recv.
140  * The recv buffer, however, is not owned by this structure, and
141  * is "donated" to the hardware when a recv is posted. When a
142  * reply is handled, the recv buffer used is given back to the
143  * struct rpcrdma_req associated with the request.
144  *
145  * In addition to the basic memory, this structure includes an array
146  * of iovs for send operations. The reason is that the iovs passed to
147  * ib_post_{send,recv} must not be modified until the work request
148  * completes.
149  *
150  * NOTES:
151  *   o RPCRDMA_MAX_SEGS is the max number of addressible chunk elements we
152  *     marshal. The number needed varies depending on the iov lists that
153  *     are passed to us, the memory registration mode we are in, and if
154  *     physical addressing is used, the layout.
155  */
156 
157 struct rpcrdma_mr_seg {         /* chunk descriptors */
158         union {                         /* chunk memory handles */
159                 struct ib_mr    *rl_mr;         /* if registered directly */
160                 struct rpcrdma_mw {             /* if registered from region */
161                         union {
162                                 struct ib_mw    *mw;
163                                 struct ib_fmr   *fmr;
164                                 struct {
165                                         struct ib_fast_reg_page_list *fr_pgl;
166                                         struct ib_mr *fr_mr;
167                                         enum { FRMR_IS_INVALID, FRMR_IS_VALID  } state;
168                                 } frmr;
169                         } r;
170                         struct list_head mw_list;
171                 } *rl_mw;
172         } mr_chunk;
173         u64             mr_base;        /* registration result */
174         u32             mr_rkey;        /* registration result */
175         u32             mr_len;         /* length of chunk or segment */
176         int             mr_nsegs;       /* number of segments in chunk or 0 */
177         enum dma_data_direction mr_dir; /* segment mapping direction */
178         dma_addr_t      mr_dma;         /* segment mapping address */
179         size_t          mr_dmalen;      /* segment mapping length */
180         struct page     *mr_page;       /* owning page, if any */
181         char            *mr_offset;     /* kva if no page, else offset */
182 };
183 
184 struct rpcrdma_req {
185         size_t          rl_size;        /* actual length of buffer */
186         unsigned int    rl_niovs;       /* 0, 2 or 4 */
187         unsigned int    rl_nchunks;     /* non-zero if chunks */
188         unsigned int    rl_connect_cookie;      /* retry detection */
189         struct rpcrdma_buffer *rl_buffer; /* home base for this structure */
190         struct rpcrdma_rep      *rl_reply;/* holder for reply buffer */
191         struct rpcrdma_mr_seg rl_segments[RPCRDMA_MAX_SEGS];/* chunk segments */
192         struct ib_sge   rl_send_iov[4]; /* for active requests */
193         struct ib_sge   rl_iov;         /* for posting */
194         struct ib_mr    *rl_handle;     /* handle for mem in rl_iov */
195         char            rl_base[MAX_RPCRDMAHDR]; /* start of actual buffer */
196         __u32           rl_xdr_buf[0];  /* start of returned rpc rq_buffer */
197 };
198 #define rpcr_to_rdmar(r) \
199         container_of((r)->rq_buffer, struct rpcrdma_req, rl_xdr_buf[0])
200 
201 /*
202  * struct rpcrdma_buffer -- holds list/queue of pre-registered memory for
203  * inline requests/replies, and client/server credits.
204  *
205  * One of these is associated with a transport instance
206  */
207 struct rpcrdma_buffer {
208         spinlock_t      rb_lock;        /* protects indexes */
209         atomic_t        rb_credits;     /* most recent server credits */
210         unsigned long   rb_cwndscale;   /* cached framework rpc_cwndscale */
211         int             rb_max_requests;/* client max requests */
212         struct list_head rb_mws;        /* optional memory windows/fmrs/frmrs */
213         int             rb_send_index;
214         struct rpcrdma_req      **rb_send_bufs;
215         int             rb_recv_index;
216         struct rpcrdma_rep      **rb_recv_bufs;
217         char            *rb_pool;
218 };
219 #define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)
220 
221 /*
222  * Internal structure for transport instance creation. This
223  * exists primarily for modularity.
224  *
225  * This data should be set with mount options
226  */
227 struct rpcrdma_create_data_internal {
228         struct sockaddr_storage addr;   /* RDMA server address */
229         unsigned int    max_requests;   /* max requests (slots) in flight */
230         unsigned int    rsize;          /* mount rsize - max read hdr+data */
231         unsigned int    wsize;          /* mount wsize - max write hdr+data */
232         unsigned int    inline_rsize;   /* max non-rdma read data payload */
233         unsigned int    inline_wsize;   /* max non-rdma write data payload */
234         unsigned int    padding;        /* non-rdma write header padding */
235 };
236 
237 #define RPCRDMA_INLINE_READ_THRESHOLD(rq) \
238         (rpcx_to_rdmad(rq->rq_xprt).inline_rsize)
239 
240 #define RPCRDMA_INLINE_WRITE_THRESHOLD(rq)\
241         (rpcx_to_rdmad(rq->rq_xprt).inline_wsize)
242 
243 #define RPCRDMA_INLINE_PAD_VALUE(rq)\
244         rpcx_to_rdmad(rq->rq_xprt).padding
245 
246 /*
247  * Statistics for RPCRDMA
248  */
249 struct rpcrdma_stats {
250         unsigned long           read_chunk_count;
251         unsigned long           write_chunk_count;
252         unsigned long           reply_chunk_count;
253 
254         unsigned long long      total_rdma_request;
255         unsigned long long      total_rdma_reply;
256 
257         unsigned long long      pullup_copy_count;
258         unsigned long long      fixup_copy_count;
259         unsigned long           hardway_register_count;
260         unsigned long           failed_marshal_count;
261         unsigned long           bad_reply_count;
262 };
263 
264 /*
265  * RPCRDMA transport -- encapsulates the structures above for
266  * integration with RPC.
267  *
268  * The contained structures are embedded, not pointers,
269  * for convenience. This structure need not be visible externally.
270  *
271  * It is allocated and initialized during mount, and released
272  * during unmount.
273  */
274 struct rpcrdma_xprt {
275         struct rpc_xprt         xprt;
276         struct rpcrdma_ia       rx_ia;
277         struct rpcrdma_ep       rx_ep;
278         struct rpcrdma_buffer   rx_buf;
279         struct rpcrdma_create_data_internal rx_data;
280         struct delayed_work     rdma_connect;
281         struct rpcrdma_stats    rx_stats;
282 };
283 
284 #define rpcx_to_rdmax(x) container_of(x, struct rpcrdma_xprt, xprt)
285 #define rpcx_to_rdmad(x) (rpcx_to_rdmax(x)->rx_data)
286 
287 /* Setting this to 0 ensures interoperability with early servers.
288  * Setting this to 1 enhances certain unaligned read/write performance.
289  * Default is 0, see sysctl entry and rpc_rdma.c rpcrdma_convert_iovs() */
290 extern int xprt_rdma_pad_optimize;
291 
292 /*
293  * Interface Adapter calls - xprtrdma/verbs.c
294  */
295 int rpcrdma_ia_open(struct rpcrdma_xprt *, struct sockaddr *, int);
296 void rpcrdma_ia_close(struct rpcrdma_ia *);
297 
298 /*
299  * Endpoint calls - xprtrdma/verbs.c
300  */
301 int rpcrdma_ep_create(struct rpcrdma_ep *, struct rpcrdma_ia *,
302                                 struct rpcrdma_create_data_internal *);
303 int rpcrdma_ep_destroy(struct rpcrdma_ep *, struct rpcrdma_ia *);
304 int rpcrdma_ep_connect(struct rpcrdma_ep *, struct rpcrdma_ia *);
305 int rpcrdma_ep_disconnect(struct rpcrdma_ep *, struct rpcrdma_ia *);
306 
307 int rpcrdma_ep_post(struct rpcrdma_ia *, struct rpcrdma_ep *,
308                                 struct rpcrdma_req *);
309 int rpcrdma_ep_post_recv(struct rpcrdma_ia *, struct rpcrdma_ep *,
310                                 struct rpcrdma_rep *);
311 
312 /*
313  * Buffer calls - xprtrdma/verbs.c
314  */
315 int rpcrdma_buffer_create(struct rpcrdma_buffer *, struct rpcrdma_ep *,
316                                 struct rpcrdma_ia *,
317                                 struct rpcrdma_create_data_internal *);
318 void rpcrdma_buffer_destroy(struct rpcrdma_buffer *);
319 
320 struct rpcrdma_req *rpcrdma_buffer_get(struct rpcrdma_buffer *);
321 void rpcrdma_buffer_put(struct rpcrdma_req *);
322 void rpcrdma_recv_buffer_get(struct rpcrdma_req *);
323 void rpcrdma_recv_buffer_put(struct rpcrdma_rep *);
324 
325 int rpcrdma_register_internal(struct rpcrdma_ia *, void *, int,
326                                 struct ib_mr **, struct ib_sge *);
327 int rpcrdma_deregister_internal(struct rpcrdma_ia *,
328                                 struct ib_mr *, struct ib_sge *);
329 
330 int rpcrdma_register_external(struct rpcrdma_mr_seg *,
331                                 int, int, struct rpcrdma_xprt *);
332 int rpcrdma_deregister_external(struct rpcrdma_mr_seg *,
333                                 struct rpcrdma_xprt *, void *);
334 
335 /*
336  * RPC/RDMA connection management calls - xprtrdma/rpc_rdma.c
337  */
338 void rpcrdma_conn_func(struct rpcrdma_ep *);
339 void rpcrdma_reply_handler(struct rpcrdma_rep *);
340 
341 /*
342  * RPC/RDMA protocol calls - xprtrdma/rpc_rdma.c
343  */
344 int rpcrdma_marshal_req(struct rpc_rqst *);
345 
346 /* Temporary NFS request map cache. Created in svc_rdma.c  */
347 extern struct kmem_cache *svc_rdma_map_cachep;
348 /* WR context cache. Created in svc_rdma.c  */
349 extern struct kmem_cache *svc_rdma_ctxt_cachep;
350 /* Workqueue created in svc_rdma.c */
351 extern struct workqueue_struct *svc_rdma_wq;
352 
353 #endif                          /* _LINUX_SUNRPC_XPRT_RDMA_H */
354 

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