2 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
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
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
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.
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
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.
39 * Author: Tom Tucker <tom@opengridcomputing.com>
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>
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_req_size;
56 extern atomic_t rdma_stat_recv;
57 extern atomic_t rdma_stat_read;
58 extern atomic_t rdma_stat_write;
59 extern atomic_t rdma_stat_sq_starve;
60 extern atomic_t rdma_stat_rq_starve;
61 extern atomic_t rdma_stat_rq_poll;
62 extern atomic_t rdma_stat_rq_prod;
63 extern atomic_t rdma_stat_sq_poll;
64 extern atomic_t rdma_stat_sq_prod;
66 #define RPCRDMA_VERSION 1
69 * Contexts are built when an RDMA request is created and are a
70 * record of the resources that can be recovered when the request
73 struct svc_rdma_op_ctxt {
74 struct svc_rdma_op_ctxt *read_hdr;
75 struct list_head free_list;
77 struct list_head dto_q;
78 enum ib_wr_opcode wr_op;
79 enum ib_wc_status wc_status;
81 struct svcxprt_rdma *xprt;
83 enum dma_data_direction direction;
85 struct ib_sge sge[RPCSVC_MAXPAGES];
86 struct page *pages[RPCSVC_MAXPAGES];
90 * NFS_ requests are mapped on the client side by the chunk lists in
91 * the RPCRDMA header. During the fetching of the RPC from the client
92 * and the writing of the reply to the client, the memory in the
93 * client and the memory in the server must be mapped as contiguous
94 * vaddr/len for access by the hardware. These data strucures keep
97 * For an RDMA_WRITE, the 'sge' maps the RPC REPLY. For RDMA_READ, the
98 * 'sge' in the svc_rdma_req_map maps the server side RPC reply and the
99 * 'ch' field maps the read-list of the RPCRDMA header to the 'sge'
100 * mapping of the reply.
102 struct svc_rdma_chunk_sge {
103 int start; /* sge no for this chunk */
104 int count; /* sge count for this chunk */
106 struct svc_rdma_req_map {
109 struct kvec sge[RPCSVC_MAXPAGES];
110 struct svc_rdma_chunk_sge ch[RPCSVC_MAXPAGES];
114 #define RDMACTXT_F_LAST_CTXT 2
116 struct svcxprt_rdma {
117 struct svc_xprt sc_xprt; /* SVC transport structure */
118 struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
119 struct list_head sc_accept_q; /* Conn. waiting accept */
120 int sc_ord; /* RDMA read limit */
121 wait_queue_head_t sc_read_wait;
124 int sc_sq_depth; /* Depth of SQ */
125 atomic_t sc_sq_count; /* Number of SQ WR on queue */
127 int sc_max_requests; /* Depth of RQ */
128 int sc_max_req_size; /* Size of each RQ WR buf */
132 atomic_t sc_ctxt_used;
133 struct list_head sc_ctxt_free;
137 spinlock_t sc_ctxt_lock;
138 struct list_head sc_rq_dto_q;
139 spinlock_t sc_rq_dto_lock;
141 struct ib_cq *sc_rq_cq;
142 struct ib_cq *sc_sq_cq;
143 struct ib_mr *sc_phys_mr; /* MR for server memory */
145 spinlock_t sc_lock; /* transport lock */
147 wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
148 unsigned long sc_flags;
149 struct list_head sc_dto_q; /* DTO tasklet I/O pending Q */
150 struct list_head sc_read_complete_q;
151 spinlock_t sc_read_complete_lock;
152 struct work_struct sc_work;
155 #define RDMAXPRT_RQ_PENDING 1
156 #define RDMAXPRT_SQ_PENDING 2
157 #define RDMAXPRT_CONN_PENDING 3
159 #define RPCRDMA_LISTEN_BACKLOG 10
160 /* The default ORD value is based on two outstanding full-size writes with a
161 * page size of 4k, or 32k * 2 ops / 4k = 16 outstanding RDMA_READ. */
162 #define RPCRDMA_ORD (64/4)
163 #define RPCRDMA_SQ_DEPTH_MULT 8
164 #define RPCRDMA_MAX_THREADS 16
165 #define RPCRDMA_MAX_REQUESTS 16
166 #define RPCRDMA_MAX_REQ_SIZE 4096
168 /* svc_rdma_marshal.c */
169 extern void svc_rdma_rcl_chunk_counts(struct rpcrdma_read_chunk *,
171 extern int svc_rdma_xdr_decode_req(struct rpcrdma_msg **, struct svc_rqst *);
172 extern int svc_rdma_xdr_decode_deferred_req(struct svc_rqst *);
173 extern int svc_rdma_xdr_encode_error(struct svcxprt_rdma *,
174 struct rpcrdma_msg *,
175 enum rpcrdma_errcode, u32 *);
176 extern void svc_rdma_xdr_encode_write_list(struct rpcrdma_msg *, int);
177 extern void svc_rdma_xdr_encode_reply_array(struct rpcrdma_write_array *, int);
178 extern void svc_rdma_xdr_encode_array_chunk(struct rpcrdma_write_array *, int,
180 extern void svc_rdma_xdr_encode_reply_header(struct svcxprt_rdma *,
181 struct rpcrdma_msg *,
182 struct rpcrdma_msg *,
184 extern int svc_rdma_xdr_get_reply_hdr_len(struct rpcrdma_msg *);
186 /* svc_rdma_recvfrom.c */
187 extern int svc_rdma_recvfrom(struct svc_rqst *);
189 /* svc_rdma_sendto.c */
190 extern int svc_rdma_sendto(struct svc_rqst *);
192 /* svc_rdma_transport.c */
193 extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
194 extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
195 enum rpcrdma_errcode);
196 struct page *svc_rdma_get_page(void);
197 extern int svc_rdma_post_recv(struct svcxprt_rdma *);
198 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
199 extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);
200 extern void svc_rdma_put_context(struct svc_rdma_op_ctxt *, int);
201 extern struct svc_rdma_req_map *svc_rdma_get_req_map(void);
202 extern void svc_rdma_put_req_map(struct svc_rdma_req_map *);
203 extern void svc_sq_reap(struct svcxprt_rdma *);
204 extern void svc_rq_reap(struct svcxprt_rdma *);
205 extern struct svc_xprt_class svc_rdma_class;
206 extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
209 extern int svc_rdma_init(void);
210 extern void svc_rdma_cleanup(void);
213 * Returns the address of the first read chunk or <nul> if no read chunk is
216 static inline struct rpcrdma_read_chunk *
217 svc_rdma_get_read_chunk(struct rpcrdma_msg *rmsgp)
219 struct rpcrdma_read_chunk *ch =
220 (struct rpcrdma_read_chunk *)&rmsgp->rm_body.rm_chunks[0];
222 if (ch->rc_discrim == 0)
229 * Returns the address of the first read write array element or <nul> if no
230 * write array list is present
232 static inline struct rpcrdma_write_array *
233 svc_rdma_get_write_array(struct rpcrdma_msg *rmsgp)
235 if (rmsgp->rm_body.rm_chunks[0] != 0
236 || rmsgp->rm_body.rm_chunks[1] == 0)
239 return (struct rpcrdma_write_array *)&rmsgp->rm_body.rm_chunks[1];
243 * Returns the address of the first reply array element or <nul> if no
244 * reply array is present
246 static inline struct rpcrdma_write_array *
247 svc_rdma_get_reply_array(struct rpcrdma_msg *rmsgp)
249 struct rpcrdma_read_chunk *rch;
250 struct rpcrdma_write_array *wr_ary;
251 struct rpcrdma_write_array *rp_ary;
253 /* XXX: Need to fix when reply list may occur with read-list and/or
255 if (rmsgp->rm_body.rm_chunks[0] != 0 ||
256 rmsgp->rm_body.rm_chunks[1] != 0)
259 rch = svc_rdma_get_read_chunk(rmsgp);
261 while (rch->rc_discrim)
264 /* The reply list follows an empty write array located
265 * at 'rc_position' here. The reply array is at rc_target.
267 rp_ary = (struct rpcrdma_write_array *)&rch->rc_target;
272 wr_ary = svc_rdma_get_write_array(rmsgp);
274 rp_ary = (struct rpcrdma_write_array *)
276 wc_array[wr_ary->wc_nchunks].wc_target.rs_length;
281 /* No read list, no write list */
282 rp_ary = (struct rpcrdma_write_array *)
283 &rmsgp->rm_body.rm_chunks[2];
286 if (rp_ary->wc_discrim == 0)