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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2/*
3 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
4 *
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
9 * license below:
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
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.
22 *
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
26 * permission.
27 *
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.
39 *
40 * Author: Tom Tucker <tom@opengridcomputing.com>
41 */
42
43#ifndef SVC_RDMA_H
44#define SVC_RDMA_H
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 <rdma/ib_verbs.h>
50#include <rdma/rdma_cm.h>
51
52/* Default and maximum inline threshold sizes */
53enum {
54 RPCRDMA_PULLUP_THRESH = RPCRDMA_V1_DEF_INLINE_SIZE >> 1,
55 RPCRDMA_DEF_INLINE_THRESH = 4096,
56 RPCRDMA_MAX_INLINE_THRESH = 65536
57};
58
59/* RPC/RDMA parameters and stats */
60extern unsigned int svcrdma_ord;
61extern unsigned int svcrdma_max_requests;
62extern unsigned int svcrdma_max_bc_requests;
63extern unsigned int svcrdma_max_req_size;
64
65extern atomic_t rdma_stat_recv;
66extern atomic_t rdma_stat_read;
67extern atomic_t rdma_stat_write;
68extern atomic_t rdma_stat_sq_starve;
69extern atomic_t rdma_stat_rq_starve;
70extern atomic_t rdma_stat_rq_poll;
71extern atomic_t rdma_stat_rq_prod;
72extern atomic_t rdma_stat_sq_poll;
73extern atomic_t rdma_stat_sq_prod;
74
75struct svcxprt_rdma {
76 struct svc_xprt sc_xprt; /* SVC transport structure */
77 struct rdma_cm_id *sc_cm_id; /* RDMA connection id */
78 struct list_head sc_accept_q; /* Conn. waiting accept */
79 int sc_ord; /* RDMA read limit */
80 int sc_max_send_sges;
81 bool sc_snd_w_inv; /* OK to use Send With Invalidate */
82
83 atomic_t sc_sq_avail; /* SQEs ready to be consumed */
84 unsigned int sc_sq_depth; /* Depth of SQ */
85 __be32 sc_fc_credits; /* Forward credits */
86 u32 sc_max_requests; /* Max requests */
87 u32 sc_max_bc_requests;/* Backward credits */
88 int sc_max_req_size; /* Size of each RQ WR buf */
89 u8 sc_port_num;
90
91 struct ib_pd *sc_pd;
92
93 spinlock_t sc_send_lock;
94 struct list_head sc_send_ctxts;
95 spinlock_t sc_rw_ctxt_lock;
96 struct list_head sc_rw_ctxts;
97
98 struct list_head sc_rq_dto_q;
99 spinlock_t sc_rq_dto_lock;
100 struct ib_qp *sc_qp;
101 struct ib_cq *sc_rq_cq;
102 struct ib_cq *sc_sq_cq;
103
104 spinlock_t sc_lock; /* transport lock */
105
106 wait_queue_head_t sc_send_wait; /* SQ exhaustion waitlist */
107 unsigned long sc_flags;
108 struct list_head sc_read_complete_q;
109 struct work_struct sc_work;
110
111 struct llist_head sc_recv_ctxts;
112};
113/* sc_flags */
114#define RDMAXPRT_CONN_PENDING 3
115
116/*
117 * Default connection parameters
118 */
119enum {
120 RPCRDMA_LISTEN_BACKLOG = 10,
121 RPCRDMA_MAX_REQUESTS = 64,
122 RPCRDMA_MAX_BC_REQUESTS = 2,
123};
124
125#define RPCSVC_MAXPAYLOAD_RDMA RPCSVC_MAXPAYLOAD
126
127struct svc_rdma_recv_ctxt {
128 struct llist_node rc_node;
129 struct list_head rc_list;
130 struct ib_recv_wr rc_recv_wr;
131 struct ib_cqe rc_cqe;
132 struct ib_sge rc_recv_sge;
133 void *rc_recv_buf;
134 struct xdr_buf rc_arg;
135 struct xdr_stream rc_stream;
136 bool rc_temp;
137 u32 rc_byte_len;
138 unsigned int rc_page_count;
139 unsigned int rc_hdr_count;
140 u32 rc_inv_rkey;
141 __be32 *rc_write_list;
142 __be32 *rc_reply_chunk;
143 unsigned int rc_read_payload_offset;
144 unsigned int rc_read_payload_length;
145 struct page *rc_pages[RPCSVC_MAXPAGES];
146};
147
148struct svc_rdma_send_ctxt {
149 struct list_head sc_list;
150 struct ib_send_wr sc_send_wr;
151 struct ib_cqe sc_cqe;
152 struct xdr_buf sc_hdrbuf;
153 struct xdr_stream sc_stream;
154 void *sc_xprt_buf;
155 int sc_page_count;
156 int sc_cur_sge_no;
157 struct page *sc_pages[RPCSVC_MAXPAGES];
158 struct ib_sge sc_sges[];
159};
160
161/* svc_rdma_backchannel.c */
162extern void svc_rdma_handle_bc_reply(struct svc_rqst *rqstp,
163 struct svc_rdma_recv_ctxt *rctxt);
164
165/* svc_rdma_recvfrom.c */
166extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
167extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
168extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
169 struct svc_rdma_recv_ctxt *ctxt);
170extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
171extern void svc_rdma_release_rqst(struct svc_rqst *rqstp);
172extern int svc_rdma_recvfrom(struct svc_rqst *);
173
174/* svc_rdma_rw.c */
175extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
176extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
177 struct svc_rqst *rqstp,
178 struct svc_rdma_recv_ctxt *head, __be32 *p);
179extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
180 __be32 *wr_ch, struct xdr_buf *xdr,
181 unsigned int offset,
182 unsigned long length);
183extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
184 const struct svc_rdma_recv_ctxt *rctxt,
185 struct xdr_buf *xdr);
186
187/* svc_rdma_sendto.c */
188extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
189extern struct svc_rdma_send_ctxt *
190 svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
191extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
192 struct svc_rdma_send_ctxt *ctxt);
193extern int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr);
194extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
195 struct svc_rdma_send_ctxt *sctxt,
196 const struct svc_rdma_recv_ctxt *rctxt,
197 struct xdr_buf *xdr);
198extern int svc_rdma_sendto(struct svc_rqst *);
199extern int svc_rdma_read_payload(struct svc_rqst *rqstp, unsigned int offset,
200 unsigned int length);
201
202/* svc_rdma_transport.c */
203extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
204extern void svc_sq_reap(struct svcxprt_rdma *);
205extern void svc_rq_reap(struct svcxprt_rdma *);
206
207extern struct svc_xprt_class svc_rdma_class;
208#ifdef CONFIG_SUNRPC_BACKCHANNEL
209extern struct svc_xprt_class svc_rdma_bc_class;
210#endif
211
212/* svc_rdma.c */
213extern int svc_rdma_init(void);
214extern void svc_rdma_cleanup(void);
215
216#endif