summaryrefslogtreecommitdiffstats
path: root/include/linux/rds.h
blob: d91dc91f544302a05765126308a345c1dac1c686 (plain) (blame)
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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/*
 * Copyright (c) 2008 Oracle.  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
 * OpenIB.org BSD 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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#ifndef _LINUX_RDS_H
#define _LINUX_RDS_H

#include <linux/types.h>

/* These sparse annotated types shouldn't be in any user
 * visible header file. We should clean this up rather
 * than kludging around them. */
#ifndef __KERNEL__
#define __be16	u_int16_t
#define __be32	u_int32_t
#define __be64	u_int64_t
#endif

#define RDS_IB_ABI_VERSION		0x301

/*
 * setsockopt/getsockopt for SOL_RDS
 */
#define RDS_CANCEL_SENT_TO      	1
#define RDS_GET_MR			2
#define RDS_FREE_MR			3
/* deprecated: RDS_BARRIER 4 */
#define RDS_RECVERR			5
#define RDS_CONG_MONITOR		6

/*
 * Control message types for SOL_RDS.
 *
 * CMSG_RDMA_ARGS (sendmsg)
 *	Request a RDMA transfer to/from the specified
 *	memory ranges.
 *	The cmsg_data is a struct rds_rdma_args.
 * RDS_CMSG_RDMA_DEST (recvmsg, sendmsg)
 *	Kernel informs application about intended
 *	source/destination of a RDMA transfer
 * RDS_CMSG_RDMA_MAP (sendmsg)
 *	Application asks kernel to map the given
 *	memory range into a IB MR, and send the
 *	R_Key along in an RDS extension header.
 *	The cmsg_data is a struct rds_get_mr_args,
 *	the same as for the GET_MR setsockopt.
 * RDS_CMSG_RDMA_STATUS (recvmsg)
 *	Returns the status of a completed RDMA operation.
 */
#define RDS_CMSG_RDMA_ARGS		1
#define RDS_CMSG_RDMA_DEST		2
#define RDS_CMSG_RDMA_MAP		3
#define RDS_CMSG_RDMA_STATUS		4
#define RDS_CMSG_CONG_UPDATE		5

#define RDS_INFO_FIRST			10000
#define RDS_INFO_COUNTERS		10000
#define RDS_INFO_CONNECTIONS		10001
/* 10002 aka RDS_INFO_FLOWS is deprecated */
#define RDS_INFO_SEND_MESSAGES		10003
#define RDS_INFO_RETRANS_MESSAGES       10004
#define RDS_INFO_RECV_MESSAGES          10005
#define RDS_INFO_SOCKETS                10006
#define RDS_INFO_TCP_SOCKETS            10007
#define RDS_INFO_IB_CONNECTIONS		10008
#define RDS_INFO_CONNECTION_STATS	10009
#define RDS_INFO_IWARP_CONNECTIONS	10010
#define RDS_INFO_LAST			10010

struct rds_info_counter {
	u_int8_t	name[32];
	u_int64_t	value;
} __attribute__((packed));

#define RDS_INFO_CONNECTION_FLAG_SENDING	0x01
#define RDS_INFO_CONNECTION_FLAG_CONNECTING	0x02
#define RDS_INFO_CONNECTION_FLAG_CONNECTED	0x04

#define TRANSNAMSIZ	16

struct rds_info_connection {
	u_int64_t	next_tx_seq;
	u_int64_t	next_rx_seq;
	__be32		laddr;
	__be32		faddr;
	u_int8_t	transport[TRANSNAMSIZ];		/* null term ascii */
	u_int8_t	flags;
} __attribute__((packed));

struct rds_info_flow {
	__be32		laddr;
	__be32		faddr;
	u_int32_t	bytes;
	__be16		lport;
	__be16		fport;
} __attribute__((packed));

#define RDS_INFO_MESSAGE_FLAG_ACK               0x01
#define RDS_INFO_MESSAGE_FLAG_FAST_ACK          0x02

struct rds_info_message {
	u_int64_t	seq;
	u_int32_t	len;
	__be32		laddr;
	__be32		faddr;
	__be16		lport;
	__be16		fport;
	u_int8_t	flags;
} __attribute__((packed));

struct rds_info_socket {
	u_int32_t	sndbuf;
	__be32		bound_addr;
	__be32		connected_addr;
	__be16		bound_port;
	__be16		connected_port;
	u_int32_t	rcvbuf;
	u_int64_t	inum;
} __attribute__((packed));

#define RDS_IB_GID_LEN	16
struct rds_info_rdma_connection {
	__be32		src_addr;
	__be32		dst_addr;
	uint8_t		src_gid[RDS_IB_GID_LEN];
	uint8_t		dst_gid[RDS_IB_GID_LEN];

	uint32_t	max_send_wr;
	uint32_t	max_recv_wr;
	uint32_t	max_send_sge;
	uint32_t	rdma_mr_max;
	uint32_t	rdma_mr_size;
};

/*
 * Congestion monitoring.
 * Congestion control in RDS happens at the host connection
 * level by exchanging a bitmap marking congested ports.
 * By default, a process sleeping in poll() is always woken
 * up when the congestion map is updated.
 * With explicit monitoring, an application can have more
 * fine-grained control.
 * The application installs a 64bit mask value in the socket,
 * where each bit corresponds to a group of ports.
 * When a congestion update arrives, RDS checks the set of
 * ports that are now uncongested against the list bit mask
 * installed in the socket, and if they overlap, we queue a
 * cong_notification on the socket.
 *
 * To install the congestion monitor bitmask, use RDS_CONG_MONITOR
 * with the 64bit mask.
 * Congestion updates are received via RDS_CMSG_CONG_UPDATE
 * control messages.
 *
 * The correspondence between bits and ports is
 *	1 << (portnum % 64)
 */
#define RDS_CONG_MONITOR_SIZE	64
#define RDS_CONG_MONITOR_BIT(port)  (((unsigned int) port) % RDS_CONG_MONITOR_SIZE)
#define RDS_CONG_MONITOR_MASK(port) (1ULL << RDS_CONG_MONITOR_BIT(port))

/*
 * RDMA related types
 */

/*
 * This encapsulates a remote memory location.
 * In the current implementation, it contains the R_Key
 * of the remote memory region, and the offset into it
 * (so that the application does not have to worry about
 * alignment).
 */
typedef u_int64_t	rds_rdma_cookie_t;

struct rds_iovec {
	u_int64_t	addr;
	u_int64_t	bytes;
};

struct rds_get_mr_args {
	struct rds_iovec vec;
	u_int64_t	cookie_addr;
	uint64_t	flags;
};

struct rds_free_mr_args {
	rds_rdma_cookie_t cookie;
	u_int64_t	flags;
};

struct rds_rdma_args {
	rds_rdma_cookie_t cookie;
	struct rds_iovec remote_vec;
	u_int64_t	local_vec_addr;
	u_int64_t	nr_local;
	u_int64_t	flags;
	u_int64_t	user_token;
};

struct rds_rdma_notify {
	u_int64_t	user_token;
	int32_t		status;
};

#define RDS_RDMA_SUCCESS	0
#define RDS_RDMA_REMOTE_ERROR	1
#define RDS_RDMA_CANCELED	2
#define RDS_RDMA_DROPPED	3
#define RDS_RDMA_OTHER_ERROR	4

/*
 * Common set of flags for all RDMA related structs
 */
#define RDS_RDMA_READWRITE	0x0001
#define RDS_RDMA_FENCE		0x0002	/* use FENCE for immediate send */
#define RDS_RDMA_INVALIDATE	0x0004	/* invalidate R_Key after freeing MR */
#define RDS_RDMA_USE_ONCE	0x0008	/* free MR after use */
#define RDS_RDMA_DONTWAIT	0x0010	/* Don't wait in SET_BARRIER */
#define RDS_RDMA_NOTIFY_ME	0x0020	/* Notify when operation completes */

#endif /* IB_RDS_H */