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
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 <linux/sunrpc/svc_rdma_pcl.h>
52 #include <rdma/ib_verbs.h>
53 #include <rdma/rdma_cm.h>
55 /* Default and maximum inline threshold sizes */
57 RPCRDMA_PULLUP_THRESH = RPCRDMA_V1_DEF_INLINE_SIZE >> 1,
58 RPCRDMA_DEF_INLINE_THRESH = 4096,
59 RPCRDMA_MAX_INLINE_THRESH = 65536
62 /* RPC/RDMA parameters and stats */
63 extern unsigned int svcrdma_ord;
64 extern unsigned int svcrdma_max_requests;
65 extern unsigned int svcrdma_max_bc_requests;
66 extern unsigned int svcrdma_max_req_size;
68 extern atomic_t rdma_stat_recv;
69 extern atomic_t rdma_stat_read;
70 extern atomic_t rdma_stat_write;
71 extern atomic_t rdma_stat_sq_starve;
72 extern atomic_t rdma_stat_rq_starve;
73 extern atomic_t rdma_stat_rq_poll;
74 extern atomic_t rdma_stat_rq_prod;
75 extern atomic_t rdma_stat_sq_poll;
76 extern atomic_t rdma_stat_sq_prod;
79 struct svc_xprt sc_xprt; /* SVC transport structure */
80 struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
81 struct list_head sc_accept_q; /* Conn. waiting accept */
82 int sc_ord; /* RDMA read limit */
84 bool sc_snd_w_inv; /* OK to use Send With Invalidate */
86 atomic_t sc_sq_avail; /* SQEs ready to be consumed */
87 unsigned int sc_sq_depth; /* Depth of SQ */
88 __be32 sc_fc_credits; /* Forward credits */
89 u32 sc_max_requests; /* Max requests */
90 u32 sc_max_bc_requests;/* Backward credits */
91 int sc_max_req_size; /* Size of each RQ WR buf */
96 spinlock_t sc_send_lock;
97 struct list_head sc_send_ctxts;
98 spinlock_t sc_rw_ctxt_lock;
99 struct list_head sc_rw_ctxts;
101 struct list_head sc_rq_dto_q;
102 spinlock_t sc_rq_dto_lock;
104 struct ib_cq *sc_rq_cq;
105 struct ib_cq *sc_sq_cq;
107 spinlock_t sc_lock; /* transport lock */
109 wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
110 unsigned long sc_flags;
111 struct list_head sc_read_complete_q;
112 struct work_struct sc_work;
114 struct llist_head sc_recv_ctxts;
116 atomic_t sc_completion_ids;
119 #define RDMAXPRT_CONN_PENDING 3
122 * Default connection parameters
125 RPCRDMA_LISTEN_BACKLOG = 10,
126 RPCRDMA_MAX_REQUESTS = 64,
127 RPCRDMA_MAX_BC_REQUESTS = 2,
130 #define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
132 struct svc_rdma_recv_ctxt {
133 struct llist_node rc_node;
134 struct list_head rc_list;
135 struct ib_recv_wr rc_recv_wr;
136 struct ib_cqe rc_cqe;
137 struct rpc_rdma_cid rc_cid;
138 struct ib_sge rc_recv_sge;
140 struct xdr_buf rc_arg;
141 struct xdr_stream rc_stream;
144 unsigned int rc_page_count;
145 unsigned int rc_hdr_count;
149 struct svc_rdma_pcl rc_call_pcl;
151 struct svc_rdma_pcl rc_read_pcl;
152 struct svc_rdma_chunk *rc_cur_result_payload;
153 struct svc_rdma_pcl rc_write_pcl;
154 struct svc_rdma_pcl rc_reply_pcl;
156 struct page *rc_pages[RPCSVC_MAXPAGES];
159 struct svc_rdma_send_ctxt {
160 struct list_head sc_list;
161 struct rpc_rdma_cid sc_cid;
163 struct ib_send_wr sc_send_wr;
164 struct ib_cqe sc_cqe;
165 struct xdr_buf sc_hdrbuf;
166 struct xdr_stream sc_stream;
170 struct page *sc_pages[RPCSVC_MAXPAGES];
171 struct ib_sge sc_sges[];
174 /* svc_rdma_backchannel.c */
175 extern void svc_rdma_handle_bc_reply(struct svc_rqst *rqstp,
176 struct svc_rdma_recv_ctxt *rctxt);
178 /* svc_rdma_recvfrom.c */
179 extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
180 extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
181 extern struct svc_rdma_recv_ctxt *
182 svc_rdma_recv_ctxt_get(struct svcxprt_rdma *rdma);
183 extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
184 struct svc_rdma_recv_ctxt *ctxt);
185 extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
186 extern void svc_rdma_release_rqst(struct svc_rqst *rqstp);
187 extern int svc_rdma_recvfrom(struct svc_rqst *);
190 extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
191 extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
192 const struct svc_rdma_chunk *chunk,
193 const struct xdr_buf *xdr);
194 extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
195 const struct svc_rdma_recv_ctxt *rctxt,
196 const struct xdr_buf *xdr);
197 extern int svc_rdma_process_read_list(struct svcxprt_rdma *rdma,
198 struct svc_rqst *rqstp,
199 struct svc_rdma_recv_ctxt *head);
201 /* svc_rdma_sendto.c */
202 extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
203 extern struct svc_rdma_send_ctxt *
204 svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
205 extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
206 struct svc_rdma_send_ctxt *ctxt);
207 extern int svc_rdma_send(struct svcxprt_rdma *rdma,
208 struct svc_rdma_send_ctxt *ctxt);
209 extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
210 struct svc_rdma_send_ctxt *sctxt,
211 const struct svc_rdma_recv_ctxt *rctxt,
212 const struct xdr_buf *xdr);
213 extern void svc_rdma_send_error_msg(struct svcxprt_rdma *rdma,
214 struct svc_rdma_send_ctxt *sctxt,
215 struct svc_rdma_recv_ctxt *rctxt,
217 extern int svc_rdma_sendto(struct svc_rqst *);
218 extern int svc_rdma_result_payload(struct svc_rqst *rqstp, unsigned int offset,
219 unsigned int length);
221 /* svc_rdma_transport.c */
222 extern struct svc_xprt_class svc_rdma_class;
223 #ifdef CONFIG_SUNRPC_BACKCHANNEL
224 extern struct svc_xprt_class svc_rdma_bc_class;
228 extern int svc_rdma_init(void);
229 extern void svc_rdma_cleanup(void);