summaryrefslogtreecommitdiffstats
path: root/include/linux/sunrpc/svc_rdma.h
blob: cbcfbd0521e374254e90fea0562e29c716e62727 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
 * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the BSD-type
 * license below:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *      Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *      Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 *      Neither the name of the Network Appliance, Inc. nor the names of
 *      its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written
 *      permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Tom Tucker <tom@opengridcomputing.com>
 */

#ifndef SVC_RDMA_H
#define SVC_RDMA_H
#include <linux/llist.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/sunrpc/rpc_rdma.h>
#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#define SVCRDMA_DEBUG

/* Default and maximum inline threshold sizes */
enum {
	RPCRDMA_PULLUP_THRESH = RPCRDMA_V1_DEF_INLINE_SIZE >> 1,
	RPCRDMA_DEF_INLINE_THRESH = 4096,
	RPCRDMA_MAX_INLINE_THRESH = 65536
};

/* RPC/RDMA parameters and stats */
extern unsigned int svcrdma_ord;
extern unsigned int svcrdma_max_requests;
extern unsigned int svcrdma_max_bc_requests;
extern unsigned int svcrdma_max_req_size;

extern atomic_t rdma_stat_recv;
extern atomic_t rdma_stat_read;
extern atomic_t rdma_stat_write;
extern atomic_t rdma_stat_sq_starve;
extern atomic_t rdma_stat_rq_starve;
extern atomic_t rdma_stat_rq_poll;
extern atomic_t rdma_stat_rq_prod;
extern atomic_t rdma_stat_sq_poll;
extern atomic_t rdma_stat_sq_prod;

struct svcxprt_rdma {
	struct svc_xprt      sc_xprt;		/* SVC transport structure */
	struct rdma_cm_id    *sc_cm_id;		/* RDMA connection id */
	struct list_head     sc_accept_q;	/* Conn. waiting accept */
	int		     sc_ord;		/* RDMA read limit */
	int                  sc_max_send_sges;
	bool		     sc_snd_w_inv;	/* OK to use Send With Invalidate */

	atomic_t             sc_sq_avail;	/* SQEs ready to be consumed */
	unsigned int	     sc_sq_depth;	/* Depth of SQ */
	__be32		     sc_fc_credits;	/* Forward credits */
	u32		     sc_max_requests;	/* Max requests */
	u32		     sc_max_bc_requests;/* Backward credits */
	int                  sc_max_req_size;	/* Size of each RQ WR buf */
	u8		     sc_port_num;

	struct ib_pd         *sc_pd;

	spinlock_t	     sc_send_lock;
	struct list_head     sc_send_ctxts;
	spinlock_t	     sc_rw_ctxt_lock;
	struct list_head     sc_rw_ctxts;

	struct list_head     sc_rq_dto_q;
	spinlock_t	     sc_rq_dto_lock;
	struct ib_qp         *sc_qp;
	struct ib_cq         *sc_rq_cq;
	struct ib_cq         *sc_sq_cq;

	spinlock_t	     sc_lock;		/* transport lock */

	wait_queue_head_t    sc_send_wait;	/* SQ exhaustion waitlist */
	unsigned long	     sc_flags;
	struct list_head     sc_read_complete_q;
	struct work_struct   sc_work;

	struct llist_head    sc_recv_ctxts;
};
/* sc_flags */
#define RDMAXPRT_CONN_PENDING	3

/*
 * Default connection parameters
 */
enum {
	RPCRDMA_LISTEN_BACKLOG	= 10,
	RPCRDMA_MAX_REQUESTS	= 64,
	RPCRDMA_MAX_BC_REQUESTS	= 2,
};

#define RPCSVC_MAXPAYLOAD_RDMA	RPCSVC_MAXPAYLOAD

struct svc_rdma_recv_ctxt {
	struct llist_node	rc_node;
	struct list_head	rc_list;
	struct ib_recv_wr	rc_recv_wr;
	struct ib_cqe		rc_cqe;
	struct ib_sge		rc_recv_sge;
	void			*rc_recv_buf;
	struct xdr_buf		rc_arg;
	struct xdr_stream	rc_stream;
	bool			rc_temp;
	u32			rc_byte_len;
	unsigned int		rc_page_count;
	unsigned int		rc_hdr_count;
	u32			rc_inv_rkey;
	__be32			*rc_write_list;
	__be32			*rc_reply_chunk;
	unsigned int		rc_read_payload_offset;
	unsigned int		rc_read_payload_length;
	struct page		*rc_pages[RPCSVC_MAXPAGES];
};

struct svc_rdma_send_ctxt {
	struct list_head	sc_list;
	struct ib_send_wr	sc_send_wr;
	struct ib_cqe		sc_cqe;
	struct xdr_buf		sc_hdrbuf;
	struct xdr_stream	sc_stream;
	void			*sc_xprt_buf;
	int			sc_page_count;
	int			sc_cur_sge_no;
	struct page		*sc_pages[RPCSVC_MAXPAGES];
	struct ib_sge		sc_sges[];
};

/* svc_rdma_backchannel.c */
extern int svc_rdma_handle_bc_reply(struct rpc_xprt *xprt,
				    __be32 *rdma_resp,
				    struct xdr_buf *rcvbuf);

/* svc_rdma_recvfrom.c */
extern void svc_rdma_recv_ctxts_destroy(struct svcxprt_rdma *rdma);
extern bool svc_rdma_post_recvs(struct svcxprt_rdma *rdma);
extern void svc_rdma_recv_ctxt_put(struct svcxprt_rdma *rdma,
				   struct svc_rdma_recv_ctxt *ctxt);
extern void svc_rdma_flush_recv_queues(struct svcxprt_rdma *rdma);
extern void svc_rdma_release_rqst(struct svc_rqst *rqstp);
extern int svc_rdma_recvfrom(struct svc_rqst *);

/* svc_rdma_rw.c */
extern void svc_rdma_destroy_rw_ctxts(struct svcxprt_rdma *rdma);
extern int svc_rdma_recv_read_chunk(struct svcxprt_rdma *rdma,
				    struct svc_rqst *rqstp,
				    struct svc_rdma_recv_ctxt *head, __be32 *p);
extern int svc_rdma_send_write_chunk(struct svcxprt_rdma *rdma,
				     __be32 *wr_ch, struct xdr_buf *xdr,
				     unsigned int offset,
				     unsigned long length);
extern int svc_rdma_send_reply_chunk(struct svcxprt_rdma *rdma,
				     const struct svc_rdma_recv_ctxt *rctxt,
				     struct xdr_buf *xdr);

/* svc_rdma_sendto.c */
extern void svc_rdma_send_ctxts_destroy(struct svcxprt_rdma *rdma);
extern struct svc_rdma_send_ctxt *
		svc_rdma_send_ctxt_get(struct svcxprt_rdma *rdma);
extern void svc_rdma_send_ctxt_put(struct svcxprt_rdma *rdma,
				   struct svc_rdma_send_ctxt *ctxt);
extern int svc_rdma_send(struct svcxprt_rdma *rdma, struct ib_send_wr *wr);
extern int svc_rdma_map_reply_msg(struct svcxprt_rdma *rdma,
				  struct svc_rdma_send_ctxt *sctxt,
				  const struct svc_rdma_recv_ctxt *rctxt,
				  struct xdr_buf *xdr);
extern int svc_rdma_sendto(struct svc_rqst *);
extern int svc_rdma_read_payload(struct svc_rqst *rqstp, unsigned int offset,
				 unsigned int length);

/* svc_rdma_transport.c */
extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
extern void svc_sq_reap(struct svcxprt_rdma *);
extern void svc_rq_reap(struct svcxprt_rdma *);

extern struct svc_xprt_class svc_rdma_class;
#ifdef CONFIG_SUNRPC_BACKCHANNEL
extern struct svc_xprt_class svc_rdma_bc_class;
#endif

/* svc_rdma.c */
extern int svc_rdma_init(void);
extern void svc_rdma_cleanup(void);

#endif