summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/ulp/srp/ib_srp.h
blob: 66fbedda457128c8d2695575d8bf7a217d78abf0 (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
/*
 * Copyright (c) 2005 Cisco Systems.  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 IB_SRP_H
#define IB_SRP_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>

#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_sa.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_fmr_pool.h>

enum {
	SRP_PATH_REC_TIMEOUT_MS	= 1000,
	SRP_ABORT_TIMEOUT_MS	= 5000,

	SRP_PORT_REDIRECT	= 1,
	SRP_DLID_REDIRECT	= 2,
	SRP_STALE_CONN		= 3,

	SRP_MAX_LUN		= 512,
	SRP_DEF_SG_TABLESIZE	= 12,

	SRP_RQ_SHIFT    	= 6,
	SRP_RQ_SIZE		= 1 << SRP_RQ_SHIFT,

	SRP_SQ_SIZE		= SRP_RQ_SIZE,
	SRP_RSP_SQ_SIZE		= 1,
	SRP_REQ_SQ_SIZE		= SRP_SQ_SIZE - SRP_RSP_SQ_SIZE,
	SRP_TSK_MGMT_SQ_SIZE	= 1,
	SRP_CMD_SQ_SIZE		= SRP_REQ_SQ_SIZE - SRP_TSK_MGMT_SQ_SIZE,

	SRP_TAG_NO_REQ		= ~0U,
	SRP_TAG_TSK_MGMT	= 1U << 31,

	SRP_FMR_SIZE		= 512,
	SRP_FMR_MIN_SIZE	= 128,
	SRP_FMR_POOL_SIZE	= 1024,
	SRP_FMR_DIRTY_SIZE	= SRP_FMR_POOL_SIZE / 4,

	SRP_MAP_ALLOW_FMR	= 0,
	SRP_MAP_NO_FMR		= 1,
};

enum srp_target_state {
	SRP_TARGET_LIVE,
	SRP_TARGET_REMOVED,
};

enum srp_iu_type {
	SRP_IU_CMD,
	SRP_IU_TSK_MGMT,
	SRP_IU_RSP,
};

struct srp_device {
	struct list_head	dev_list;
	struct ib_device       *dev;
	struct ib_pd	       *pd;
	struct ib_mr	       *mr;
	struct ib_fmr_pool     *fmr_pool;
	u64			fmr_page_mask;
	int			fmr_page_size;
	int			fmr_max_size;
};

struct srp_host {
	struct srp_device      *srp_dev;
	u8			port;
	struct device		dev;
	struct list_head	target_list;
	spinlock_t		target_lock;
	struct completion	released;
	struct list_head	list;
};

struct srp_request {
	struct list_head	list;
	struct scsi_cmnd       *scmnd;
	struct srp_iu	       *cmd;
	struct ib_pool_fmr    **fmr_list;
	u64		       *map_page;
	struct srp_direct_buf  *indirect_desc;
	dma_addr_t		indirect_dma_addr;
	short			nfmr;
	short			index;
};

struct srp_target_port {
	/* These are RW in the hot path, and commonly used together */
	struct list_head	free_tx;
	struct list_head	free_reqs;
	spinlock_t		lock;
	s32			req_lim;

	/* These are read-only in the hot path */
	struct ib_cq	       *send_cq ____cacheline_aligned_in_smp;
	struct ib_cq	       *recv_cq;
	struct ib_qp	       *qp;
	u32			lkey;
	u32			rkey;
	enum srp_target_state	state;
	unsigned int		max_iu_len;
	unsigned int		cmd_sg_cnt;
	unsigned int		indirect_size;
	bool			allow_ext_sg;
	bool			transport_offline;

	/* Everything above this point is used in the hot path of
	 * command processing. Try to keep them packed into cachelines.
	 */

	__be64			id_ext;
	__be64			ioc_guid;
	__be64			service_id;
	__be64			initiator_ext;
	u16			io_class;
	struct srp_host	       *srp_host;
	struct Scsi_Host       *scsi_host;
	char			target_name[32];
	unsigned int		scsi_id;
	unsigned int		sg_tablesize;

	struct ib_sa_path_rec	path;
	__be16			orig_dgid[8];
	struct ib_sa_query     *path_query;
	int			path_query_id;

	u32			rq_tmo_jiffies;
	bool			connected;

	struct ib_cm_id	       *cm_id;

	int			max_ti_iu_len;

	int			zero_req_lim;

	struct srp_iu	       *tx_ring[SRP_SQ_SIZE];
	struct srp_iu	       *rx_ring[SRP_RQ_SIZE];
	struct srp_request	req_ring[SRP_CMD_SQ_SIZE];

	struct work_struct	remove_work;

	struct list_head	list;
	struct completion	done;
	int			status;
	bool			qp_in_error;

	struct completion	tsk_mgmt_done;
	u8			tsk_mgmt_status;
};

struct srp_iu {
	struct list_head	list;
	u64			dma;
	void		       *buf;
	size_t			size;
	enum dma_data_direction	direction;
};

struct srp_map_state {
	struct ib_pool_fmr    **next_fmr;
	struct srp_direct_buf  *desc;
	u64		       *pages;
	dma_addr_t		base_dma_addr;
	u32			fmr_len;
	u32			total_len;
	unsigned int		npages;
	unsigned int		nfmr;
	unsigned int		ndesc;
	struct scatterlist     *unmapped_sg;
	int			unmapped_index;
	dma_addr_t		unmapped_addr;
};

#endif /* IB_SRP_H */
OpenPOWER on IntegriCloud