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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38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 #include <linux/sunrpc/xdr.h>
46 #include <linux/sunrpc/svcsock.h>
47 #include <linux/sunrpc/rpc_rdma.h>
48 #include <rdma/ib_verbs.h>
49 #include <rdma/rdma_cm.h>
52 /* Default and maximum inline threshold sizes */
54 RPCRDMA_DEF_INLINE_THRESH = 4096,
55 RPCRDMA_MAX_INLINE_THRESH = 65536
58 /* RPC/RDMA parameters and stats */
59 extern unsigned int svcrdma_ord;
60 extern unsigned int svcrdma_max_requests;
61 extern unsigned int svcrdma_max_bc_requests;
62 extern unsigned int svcrdma_max_req_size;
64 extern atomic_t rdma_stat_recv;
65 extern atomic_t rdma_stat_read;
66 extern atomic_t rdma_stat_write;
67 extern atomic_t rdma_stat_sq_starve;
68 extern atomic_t rdma_stat_rq_starve;
69 extern atomic_t rdma_stat_rq_poll;
70 extern atomic_t rdma_stat_rq_prod;
71 extern atomic_t rdma_stat_sq_poll;
72 extern atomic_t rdma_stat_sq_prod;
75 struct svc_xprt sc_xprt; /* SVC transport structure */
76 struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
77 struct list_head sc_accept_q; /* Conn. waiting accept */
78 int sc_ord; /* RDMA read limit */
80 bool sc_snd_w_inv; /* OK to use Send With Invalidate */
82 atomic_t sc_sq_avail; /* SQEs ready to be consumed */
83 unsigned int sc_sq_depth; /* Depth of SQ */
84 __be32 sc_fc_credits; /* Forward credits */
85 u32 sc_max_requests; /* Max requests */
86 u32 sc_max_bc_requests;/* Backward credits */
87 int sc_max_req_size; /* Size of each RQ WR buf */
92 spinlock_t sc_send_lock;
93 struct list_head sc_send_ctxts;
94 spinlock_t sc_rw_ctxt_lock;
95 struct list_head sc_rw_ctxts;
97 struct list_head sc_rq_dto_q;
98 spinlock_t sc_rq_dto_lock;
100 struct ib_cq *sc_rq_cq;
101 struct ib_cq *sc_sq_cq;
103 spinlock_t sc_lock; /* transport lock */
105 wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
106 unsigned long sc_flags;
107 struct list_head sc_read_complete_q;
108 struct work_struct sc_work;
110 spinlock_t sc_recv_lock;
111 struct list_head sc_recv_ctxts;
114 #define RDMAXPRT_CONN_PENDING 3
117 * Default connection parameters
120 RPCRDMA_LISTEN_BACKLOG = 10,
121 RPCRDMA_MAX_REQUESTS = 64,
122 RPCRDMA_MAX_BC_REQUESTS = 2,
125 #define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
127 struct svc_rdma_recv_ctxt {
128 struct list_head rc_list;
129 struct ib_recv_wr rc_recv_wr;
130 struct ib_cqe rc_cqe;
131 struct ib_sge rc_recv_sge;
133 struct xdr_buf rc_arg;
136 unsigned int rc_page_count;
137 unsigned int rc_hdr_count;
138 struct page *rc_pages[RPCSVC_MAXPAGES];
141 struct svc_rdma_send_ctxt {
142 struct list_head sc_list;
143 struct ib_send_wr sc_send_wr;
144 struct ib_cqe sc_cqe;
148 struct page *sc_pages[RPCSVC_MAXPAGES];
149 struct ib_sge sc_sges[];
152 /* svc_rdma_backchannel.c */
153 extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
155 struct xdr_buf *rcvbuf);
157 /* svc_rdma_recvfrom.c */
158 extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
159 extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
160 extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
161 struct svc_rdma_recv_ctxt *ctxt);
162 extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
163 extern int svc_rdma_recvfrom(struct svc_rqst *);
166 extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
167 extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
168 struct svc_rqst *rqstp,
169 struct svc_rdma_recv_ctxt *head, __be32 *p);
170 extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
171 __be32 *wr_ch, struct xdr_buf *xdr);
172 extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
173 __be32 *rp_ch, bool writelist,
174 struct xdr_buf *xdr);
176 /* svc_rdma_sendto.c */
177 extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
178 extern struct svc_rdma_send_ctxt *
179 svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
180 extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
181 struct svc_rdma_send_ctxt *ctxt);
182 extern int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr);
183 extern void svc_rdma_sync_reply_hdr(struct svcxprt_rdma *rdma,
184 struct svc_rdma_send_ctxt *ctxt,
186 extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
187 struct svc_rdma_send_ctxt *ctxt,
188 struct xdr_buf *xdr, __be32 *wr_lst);
189 extern int svc_rdma_sendto(struct svc_rqst *);
191 /* svc_rdma_transport.c */
192 extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
193 extern void svc_sq_reap(struct svcxprt_rdma *);
194 extern void svc_rq_reap(struct svcxprt_rdma *);
195 extern void svc_rdma_prep_reply_hdr(struct svc_rqst *);
197 extern struct svc_xprt_class svc_rdma_class;
198 #ifdef CONFIG_SUNRPC_BACKCHANNEL
199 extern struct svc_xprt_class svc_rdma_bc_class;
203 extern struct workqueue_struct *svc_rdma_wq;
204 extern int svc_rdma_init(void);
205 extern void svc_rdma_cleanup(void);