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TOMOYO Linux Cross Reference
Linux/include/linux/sunrpc/svc_rdma.h

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  1 /*
  2  * Copyright (c) 2005-2006 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  * Author: Tom Tucker <tom@opengridcomputing.com>
 40  */
 41 
 42 #ifndef SVC_RDMA_H
 43 #define SVC_RDMA_H
 44 #include <linux/sunrpc/xdr.h>
 45 #include <linux/sunrpc/svcsock.h>
 46 #include <linux/sunrpc/rpc_rdma.h>
 47 #include <rdma/ib_verbs.h>
 48 #include <rdma/rdma_cm.h>
 49 #define SVCRDMA_DEBUG
 50 
 51 /* RPC/RDMA parameters and stats */
 52 extern unsigned int svcrdma_ord;
 53 extern unsigned int svcrdma_max_requests;
 54 extern unsigned int svcrdma_max_bc_requests;
 55 extern unsigned int svcrdma_max_req_size;
 56 
 57 extern atomic_t rdma_stat_recv;
 58 extern atomic_t rdma_stat_read;
 59 extern atomic_t rdma_stat_write;
 60 extern atomic_t rdma_stat_sq_starve;
 61 extern atomic_t rdma_stat_rq_starve;
 62 extern atomic_t rdma_stat_rq_poll;
 63 extern atomic_t rdma_stat_rq_prod;
 64 extern atomic_t rdma_stat_sq_poll;
 65 extern atomic_t rdma_stat_sq_prod;
 66 
 67 /*
 68  * Contexts are built when an RDMA request is created and are a
 69  * record of the resources that can be recovered when the request
 70  * completes.
 71  */
 72 struct svc_rdma_op_ctxt {
 73         struct list_head list;
 74         struct svc_rdma_op_ctxt *read_hdr;
 75         struct svc_rdma_fastreg_mr *frmr;
 76         int hdr_count;
 77         struct xdr_buf arg;
 78         struct ib_cqe cqe;
 79         struct ib_cqe reg_cqe;
 80         struct ib_cqe inv_cqe;
 81         u32 byte_len;
 82         u32 position;
 83         struct svcxprt_rdma *xprt;
 84         unsigned long flags;
 85         enum dma_data_direction direction;
 86         int count;
 87         unsigned int mapped_sges;
 88         struct ib_sge sge[RPCSVC_MAXPAGES];
 89         struct page *pages[RPCSVC_MAXPAGES];
 90 };
 91 
 92 /*
 93  * NFS_ requests are mapped on the client side by the chunk lists in
 94  * the RPCRDMA header. During the fetching of the RPC from the client
 95  * and the writing of the reply to the client, the memory in the
 96  * client and the memory in the server must be mapped as contiguous
 97  * vaddr/len for access by the hardware. These data strucures keep
 98  * these mappings.
 99  *
100  * For an RDMA_WRITE, the 'sge' maps the RPC REPLY. For RDMA_READ, the
101  * 'sge' in the svc_rdma_req_map maps the server side RPC reply and the
102  * 'ch' field maps the read-list of the RPCRDMA header to the 'sge'
103  * mapping of the reply.
104  */
105 struct svc_rdma_chunk_sge {
106         int start;              /* sge no for this chunk */
107         int count;              /* sge count for this chunk */
108 };
109 struct svc_rdma_fastreg_mr {
110         struct ib_mr *mr;
111         struct scatterlist *sg;
112         int sg_nents;
113         unsigned long access_flags;
114         enum dma_data_direction direction;
115         struct list_head frmr_list;
116 };
117 struct svc_rdma_req_map {
118         struct list_head free;
119         unsigned long count;
120         union {
121                 struct kvec sge[RPCSVC_MAXPAGES];
122                 struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
123                 unsigned long lkey[RPCSVC_MAXPAGES];
124         };
125 };
126 #define RDMACTXT_F_LAST_CTXT    2
127 
128 #define SVCRDMA_DEVCAP_FAST_REG         1       /* fast mr registration */
129 #define SVCRDMA_DEVCAP_READ_W_INV       2       /* read w/ invalidate */
130 
131 struct svcxprt_rdma {
132         struct svc_xprt      sc_xprt;           /* SVC transport structure */
133         struct rdma_cm_id    *sc_cm_id;         /* RDMA connection id */
134         struct list_head     sc_accept_q;       /* Conn. waiting accept */
135         int                  sc_ord;            /* RDMA read limit */
136         int                  sc_max_sge;
137         int                  sc_max_sge_rd;     /* max sge for read target */
138         bool                 sc_snd_w_inv;      /* OK to use Send With Invalidate */
139 
140         atomic_t             sc_sq_avail;       /* SQEs ready to be consumed */
141         unsigned int         sc_sq_depth;       /* Depth of SQ */
142         unsigned int         sc_rq_depth;       /* Depth of RQ */
143         __be32               sc_fc_credits;     /* Forward credits */
144         u32                  sc_max_requests;   /* Max requests */
145         u32                  sc_max_bc_requests;/* Backward credits */
146         int                  sc_max_req_size;   /* Size of each RQ WR buf */
147 
148         struct ib_pd         *sc_pd;
149 
150         spinlock_t           sc_ctxt_lock;
151         struct list_head     sc_ctxts;
152         int                  sc_ctxt_used;
153         spinlock_t           sc_map_lock;
154         struct list_head     sc_maps;
155 
156         struct list_head     sc_rq_dto_q;
157         spinlock_t           sc_rq_dto_lock;
158         struct ib_qp         *sc_qp;
159         struct ib_cq         *sc_rq_cq;
160         struct ib_cq         *sc_sq_cq;
161         int                  (*sc_reader)(struct svcxprt_rdma *,
162                                           struct svc_rqst *,
163                                           struct svc_rdma_op_ctxt *,
164                                           int *, u32 *, u32, u32, u64, bool);
165         u32                  sc_dev_caps;       /* distilled device caps */
166         unsigned int         sc_frmr_pg_list_len;
167         struct list_head     sc_frmr_q;
168         spinlock_t           sc_frmr_q_lock;
169 
170         spinlock_t           sc_lock;           /* transport lock */
171 
172         wait_queue_head_t    sc_send_wait;      /* SQ exhaustion waitlist */
173         unsigned long        sc_flags;
174         struct list_head     sc_read_complete_q;
175         struct work_struct   sc_work;
176 };
177 /* sc_flags */
178 #define RDMAXPRT_CONN_PENDING   3
179 
180 #define RPCRDMA_LISTEN_BACKLOG  10
181 /* The default ORD value is based on two outstanding full-size writes with a
182  * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ.  */
183 #define RPCRDMA_ORD             (64/4)
184 #define RPCRDMA_SQ_DEPTH_MULT   8
185 #define RPCRDMA_MAX_REQUESTS    32
186 #define RPCRDMA_MAX_REQ_SIZE    4096
187 
188 /* Typical ULP usage of BC requests is NFSv4.1 backchannel. Our
189  * current NFSv4.1 implementation supports one backchannel slot.
190  */
191 #define RPCRDMA_MAX_BC_REQUESTS 2
192 
193 #define RPCSVC_MAXPAYLOAD_RDMA  RPCSVC_MAXPAYLOAD
194 
195 /* Track DMA maps for this transport and context */
196 static inline void svc_rdma_count_mappings(struct svcxprt_rdma *rdma,
197                                            struct svc_rdma_op_ctxt *ctxt)
198 {
199         ctxt->mapped_sges++;
200 }
201 
202 /* svc_rdma_backchannel.c */
203 extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
204                                     struct rpcrdma_msg *rmsgp,
205                                     struct xdr_buf *rcvbuf);
206 
207 /* svc_rdma_marshal.c */
208 extern int svc_rdma_xdr_decode_req(struct xdr_buf *);
209 extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
210                                      struct rpcrdma_msg *,
211                                      enum rpcrdma_errcode, __be32 *);
212 extern void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *, int);
213 extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
214 extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
215                                             __be32, __be64, u32);
216 extern unsigned int svc_rdma_xdr_get_reply_hdr_len(__be32 *rdma_resp);
217 
218 /* svc_rdma_recvfrom.c */
219 extern int svc_rdma_recvfrom(struct svc_rqst *);
220 extern int rdma_read_chunk_lcl(struct svcxprt_rdma *, struct svc_rqst *,
221                                struct svc_rdma_op_ctxt *, int *, u32 *,
222                                u32, u32, u64, bool);
223 extern int rdma_read_chunk_frmr(struct svcxprt_rdma *, struct svc_rqst *,
224                                 struct svc_rdma_op_ctxt *, int *, u32 *,
225                                 u32, u32, u64, bool);
226 
227 /* svc_rdma_sendto.c */
228 extern int svc_rdma_map_xdr(struct svcxprt_rdma *, struct xdr_buf *,
229                             struct svc_rdma_req_map *, bool);
230 extern int svc_rdma_sendto(struct svc_rqst *);
231 extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
232                                 int);
233 
234 /* svc_rdma_transport.c */
235 extern void svc_rdma_wc_send(struct ib_cq *, struct ib_wc *);
236 extern void svc_rdma_wc_write(struct ib_cq *, struct ib_wc *);
237 extern void svc_rdma_wc_reg(struct ib_cq *, struct ib_wc *);
238 extern void svc_rdma_wc_read(struct ib_cq *, struct ib_wc *);
239 extern void svc_rdma_wc_inv(struct ib_cq *, struct ib_wc *);
240 extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
241 extern int svc_rdma_post_recv(struct svcxprt_rdma *, gfp_t);
242 extern int svc_rdma_repost_recv(struct svcxprt_rdma *, gfp_t);
243 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
244 extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
245 extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
246 extern void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt);
247 extern struct svc_rdma_req_map *svc_rdma_get_req_map(struct svcxprt_rdma *);
248 extern void svc_rdma_put_req_map(struct svcxprt_rdma *,
249                                  struct svc_rdma_req_map *);
250 extern struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *);
251 extern void svc_rdma_put_frmr(struct svcxprt_rdma *,
252                               struct svc_rdma_fastreg_mr *);
253 extern void svc_sq_reap(struct svcxprt_rdma *);
254 extern void svc_rq_reap(struct svcxprt_rdma *);
255 extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
256 
257 extern struct svc_xprt_class svc_rdma_class;
258 #ifdef CONFIG_SUNRPC_BACKCHANNEL
259 extern struct svc_xprt_class svc_rdma_bc_class;
260 #endif
261 
262 /* svc_rdma.c */
263 extern struct workqueue_struct *svc_rdma_wq;
264 extern int svc_rdma_init(void);
265 extern void svc_rdma_cleanup(void);
266 
267 #endif
268 

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