1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
3 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the BSD-type
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
15 * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
18 * Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials provided
21 * with the distribution.
23 * Neither the name of the Network Appliance, Inc. nor the names of
24 * its contributors may be used to endorse or promote products
25 * derived from this software without specific prior written
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 #include <linux/llist.h>
46 #include <linux/sunrpc/xdr.h>
47 #include <linux/sunrpc/svcsock.h>
48 #include <linux/sunrpc/rpc_rdma.h>
49 #include <linux/sunrpc/rpc_rdma_cid.h>
50 #include <rdma/ib_verbs.h>
51 #include <rdma/rdma_cm.h>
53 /* Default and maximum inline threshold sizes */
55 RPCRDMA_PULLUP_THRESH = RPCRDMA_V1_DEF_INLINE_SIZE >> 1,
56 RPCRDMA_DEF_INLINE_THRESH = 4096,
57 RPCRDMA_MAX_INLINE_THRESH = 65536
60 /* RPC/RDMA parameters and stats */
61 extern unsigned int svcrdma_ord;
62 extern unsigned int svcrdma_max_requests;
63 extern unsigned int svcrdma_max_bc_requests;
64 extern unsigned int svcrdma_max_req_size;
66 extern atomic_t rdma_stat_recv;
67 extern atomic_t rdma_stat_read;
68 extern atomic_t rdma_stat_write;
69 extern atomic_t rdma_stat_sq_starve;
70 extern atomic_t rdma_stat_rq_starve;
71 extern atomic_t rdma_stat_rq_poll;
72 extern atomic_t rdma_stat_rq_prod;
73 extern atomic_t rdma_stat_sq_poll;
74 extern atomic_t rdma_stat_sq_prod;
77 struct svc_xprt sc_xprt; /* SVC transport structure */
78 struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
79 struct list_head sc_accept_q; /* Conn. waiting accept */
80 int sc_ord; /* RDMA read limit */
82 bool sc_snd_w_inv; /* OK to use Send With Invalidate */
84 atomic_t sc_sq_avail; /* SQEs ready to be consumed */
85 unsigned int sc_sq_depth; /* Depth of SQ */
86 __be32 sc_fc_credits; /* Forward credits */
87 u32 sc_max_requests; /* Max requests */
88 u32 sc_max_bc_requests;/* Backward credits */
89 int sc_max_req_size; /* Size of each RQ WR buf */
94 spinlock_t sc_send_lock;
95 struct list_head sc_send_ctxts;
96 spinlock_t sc_rw_ctxt_lock;
97 struct list_head sc_rw_ctxts;
99 struct list_head sc_rq_dto_q;
100 spinlock_t sc_rq_dto_lock;
102 struct ib_cq *sc_rq_cq;
103 struct ib_cq *sc_sq_cq;
105 spinlock_t sc_lock; /* transport lock */
107 wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
108 unsigned long sc_flags;
109 struct list_head sc_read_complete_q;
110 struct work_struct sc_work;
112 struct llist_head sc_recv_ctxts;
114 atomic_t sc_completion_ids;
117 #define RDMAXPRT_CONN_PENDING 3
120 * Default connection parameters
123 RPCRDMA_LISTEN_BACKLOG = 10,
124 RPCRDMA_MAX_REQUESTS = 64,
125 RPCRDMA_MAX_BC_REQUESTS = 2,
128 #define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
130 struct svc_rdma_recv_ctxt {
131 struct llist_node rc_node;
132 struct list_head rc_list;
133 struct ib_recv_wr rc_recv_wr;
134 struct ib_cqe rc_cqe;
135 struct rpc_rdma_cid rc_cid;
136 struct ib_sge rc_recv_sge;
138 struct xdr_buf rc_arg;
139 struct xdr_stream rc_stream;
142 unsigned int rc_page_count;
143 unsigned int rc_hdr_count;
145 __be32 *rc_write_list;
146 __be32 *rc_reply_chunk;
147 unsigned int rc_read_payload_offset;
148 unsigned int rc_read_payload_length;
149 struct page *rc_pages[RPCSVC_MAXPAGES];
152 struct svc_rdma_send_ctxt {
153 struct list_head sc_list;
154 struct rpc_rdma_cid sc_cid;
156 struct ib_send_wr sc_send_wr;
157 struct ib_cqe sc_cqe;
158 struct xdr_buf sc_hdrbuf;
159 struct xdr_stream sc_stream;
163 struct page *sc_pages[RPCSVC_MAXPAGES];
164 struct ib_sge sc_sges[];
167 /* svc_rdma_backchannel.c */
168 extern void svc_rdma_handle_bc_reply(struct svc_rqst *rqstp,
169 struct svc_rdma_recv_ctxt *rctxt);
171 /* svc_rdma_recvfrom.c */
172 extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
173 extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
174 extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
175 struct svc_rdma_recv_ctxt *ctxt);
176 extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
177 extern void svc_rdma_release_rqst(struct svc_rqst *rqstp);
178 extern int svc_rdma_recvfrom(struct svc_rqst *);
181 extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
182 extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
183 struct svc_rqst *rqstp,
184 struct svc_rdma_recv_ctxt *head, __be32 *p);
185 extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
186 __be32 *wr_ch, struct xdr_buf *xdr,
188 unsigned long length);
189 extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
190 const struct svc_rdma_recv_ctxt *rctxt,
191 struct xdr_buf *xdr);
193 /* svc_rdma_sendto.c */
194 extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
195 extern struct svc_rdma_send_ctxt *
196 svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
197 extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
198 struct svc_rdma_send_ctxt *ctxt);
199 extern int svc_rdma_send(struct svcxprt_rdma *rdma,
200 struct svc_rdma_send_ctxt *ctxt);
201 extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
202 struct svc_rdma_send_ctxt *sctxt,
203 const struct svc_rdma_recv_ctxt *rctxt,
204 struct xdr_buf *xdr);
205 extern void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
206 struct svc_rdma_send_ctxt *sctxt,
207 struct svc_rdma_recv_ctxt *rctxt,
209 extern int svc_rdma_sendto(struct svc_rqst *);
210 extern int svc_rdma_read_payload(struct svc_rqst *rqstp, unsigned int offset,
211 unsigned int length);
213 /* svc_rdma_transport.c */
214 extern struct svc_xprt_class svc_rdma_class;
215 #ifdef CONFIG_SUNRPC_BACKCHANNEL
216 extern struct svc_xprt_class svc_rdma_bc_class;
220 extern int svc_rdma_init(void);
221 extern void svc_rdma_cleanup(void);