summaryrefslogtreecommitdiffstats
path: root/drivers/nvme/target/nvmet.h
blob: 76b6eedccaf92ce4708cc4b730c03775d5469f0f (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
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
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
/*
 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#ifndef _NVMET_H
#define _NVMET_H

#include <linux/dma-mapping.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/kref.h>
#include <linux/percpu-refcount.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/nvme.h>
#include <linux/configfs.h>
#include <linux/rcupdate.h>
#include <linux/blkdev.h>

#define NVMET_ASYNC_EVENTS		4
#define NVMET_ERROR_LOG_SLOTS		128

/* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM
 * The 16 bit shift is to set IATTR bit to 1, which means offending
 * offset starts in the data section of connect()
 */
#define IPO_IATTR_CONNECT_DATA(x)	\
	(cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x))))
#define IPO_IATTR_CONNECT_SQE(x)	\
	(cpu_to_le32(offsetof(struct nvmf_connect_command, x)))

struct nvmet_ns {
	struct list_head	dev_link;
	struct percpu_ref	ref;
	struct block_device	*bdev;
	u32			nsid;
	u32			blksize_shift;
	loff_t			size;
	u8			nguid[16];

	struct nvmet_subsys	*subsys;
	const char		*device_path;

	struct config_group	device_group;
	struct config_group	group;

	struct completion	disable_done;
};

static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
{
	return container_of(to_config_group(item), struct nvmet_ns, group);
}

static inline bool nvmet_ns_enabled(struct nvmet_ns *ns)
{
	return !list_empty_careful(&ns->dev_link);
}

struct nvmet_cq {
	u16			qid;
	u16			size;
};

struct nvmet_sq {
	struct nvmet_ctrl	*ctrl;
	struct percpu_ref	ref;
	u16			qid;
	u16			size;
	struct completion	free_done;
};

/**
 * struct nvmet_port -	Common structure to keep port
 *				information for the target.
 * @entry:		List head for holding a list of these elements.
 * @disc_addr:		Address information is stored in a format defined
 *				for a discovery log page entry.
 * @group:		ConfigFS group for this element's folder.
 * @priv:		Private data for the transport.
 */
struct nvmet_port {
	struct list_head		entry;
	struct nvmf_disc_rsp_page_entry	disc_addr;
	struct config_group		group;
	struct config_group		subsys_group;
	struct list_head		subsystems;
	struct config_group		referrals_group;
	struct list_head		referrals;
	void				*priv;
	bool				enabled;
};

static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
{
	return container_of(to_config_group(item), struct nvmet_port,
			group);
}

struct nvmet_ctrl {
	struct nvmet_subsys	*subsys;
	struct nvmet_cq		**cqs;
	struct nvmet_sq		**sqs;

	struct mutex		lock;
	u64			cap;
	u64			serial;
	u32			cc;
	u32			csts;

	u16			cntlid;
	u32			kato;

	struct nvmet_req	*async_event_cmds[NVMET_ASYNC_EVENTS];
	unsigned int		nr_async_event_cmds;
	struct list_head	async_events;
	struct work_struct	async_event_work;

	struct list_head	subsys_entry;
	struct kref		ref;
	struct delayed_work	ka_work;
	struct work_struct	fatal_err_work;

	struct nvmet_fabrics_ops *ops;

	char			subsysnqn[NVMF_NQN_FIELD_LEN];
	char			hostnqn[NVMF_NQN_FIELD_LEN];
};

struct nvmet_subsys {
	enum nvme_subsys_type	type;

	struct mutex		lock;
	struct kref		ref;

	struct list_head	namespaces;
	unsigned int		max_nsid;

	struct list_head	ctrls;
	struct ida		cntlid_ida;

	struct list_head	hosts;
	bool			allow_any_host;

	u16			max_qid;

	u64			ver;
	char			*subsysnqn;

	struct config_group	group;

	struct config_group	namespaces_group;
	struct config_group	allowed_hosts_group;
};

static inline struct nvmet_subsys *to_subsys(struct config_item *item)
{
	return container_of(to_config_group(item), struct nvmet_subsys, group);
}

static inline struct nvmet_subsys *namespaces_to_subsys(
		struct config_item *item)
{
	return container_of(to_config_group(item), struct nvmet_subsys,
			namespaces_group);
}

struct nvmet_host {
	struct config_group	group;
};

static inline struct nvmet_host *to_host(struct config_item *item)
{
	return container_of(to_config_group(item), struct nvmet_host, group);
}

static inline char *nvmet_host_name(struct nvmet_host *host)
{
	return config_item_name(&host->group.cg_item);
}

struct nvmet_host_link {
	struct list_head	entry;
	struct nvmet_host	*host;
};

struct nvmet_subsys_link {
	struct list_head	entry;
	struct nvmet_subsys	*subsys;
};

struct nvmet_req;
struct nvmet_fabrics_ops {
	struct module *owner;
	unsigned int type;
	unsigned int sqe_inline_size;
	unsigned int msdbd;
	bool has_keyed_sgls : 1;
	void (*queue_response)(struct nvmet_req *req);
	int (*add_port)(struct nvmet_port *port);
	void (*remove_port)(struct nvmet_port *port);
	void (*delete_ctrl)(struct nvmet_ctrl *ctrl);
};

#define NVMET_MAX_INLINE_BIOVEC	8

struct nvmet_req {
	struct nvme_command	*cmd;
	struct nvme_completion	*rsp;
	struct nvmet_sq		*sq;
	struct nvmet_cq		*cq;
	struct nvmet_ns		*ns;
	struct scatterlist	*sg;
	struct bio		inline_bio;
	struct bio_vec		inline_bvec[NVMET_MAX_INLINE_BIOVEC];
	int			sg_cnt;
	size_t			data_len;

	struct nvmet_port	*port;

	void (*execute)(struct nvmet_req *req);
	struct nvmet_fabrics_ops *ops;
};

static inline void nvmet_set_status(struct nvmet_req *req, u16 status)
{
	req->rsp->status = cpu_to_le16(status << 1);
}

static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
{
	req->rsp->result = cpu_to_le32(result);
}

/*
 * NVMe command writes actually are DMA reads for us on the target side.
 */
static inline enum dma_data_direction
nvmet_data_dir(struct nvmet_req *req)
{
	return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
}

struct nvmet_async_event {
	struct list_head	entry;
	u8			event_type;
	u8			event_info;
	u8			log_page;
};

int nvmet_parse_connect_cmd(struct nvmet_req *req);
int nvmet_parse_io_cmd(struct nvmet_req *req);
int nvmet_parse_admin_cmd(struct nvmet_req *req);
int nvmet_parse_discovery_cmd(struct nvmet_req *req);
int nvmet_parse_fabrics_cmd(struct nvmet_req *req);

bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
		struct nvmet_sq *sq, struct nvmet_fabrics_ops *ops);
void nvmet_req_complete(struct nvmet_req *req, u16 status);

void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
		u16 size);
void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid,
		u16 size);
void nvmet_sq_destroy(struct nvmet_sq *sq);
int nvmet_sq_init(struct nvmet_sq *sq);

void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);

void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
		struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
		struct nvmet_req *req, struct nvmet_ctrl **ret);
void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);

struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
		enum nvme_subsys_type type);
void nvmet_subsys_put(struct nvmet_subsys *subsys);

struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid);
void nvmet_put_namespace(struct nvmet_ns *ns);
int nvmet_ns_enable(struct nvmet_ns *ns);
void nvmet_ns_disable(struct nvmet_ns *ns);
struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid);
void nvmet_ns_free(struct nvmet_ns *ns);

int nvmet_register_transport(struct nvmet_fabrics_ops *ops);
void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops);

int nvmet_enable_port(struct nvmet_port *port);
void nvmet_disable_port(struct nvmet_port *port);

void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
void nvmet_referral_disable(struct nvmet_port *port);

u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
		size_t len);
u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
		size_t len);

u32 nvmet_get_log_page_len(struct nvme_command *cmd);

#define NVMET_QUEUE_SIZE	1024
#define NVMET_NR_QUEUES		64
#define NVMET_MAX_CMD		NVMET_QUEUE_SIZE
#define NVMET_KAS		10
#define NVMET_DISC_KATO		120

int __init nvmet_init_configfs(void);
void __exit nvmet_exit_configfs(void);

int __init nvmet_init_discovery(void);
void nvmet_exit_discovery(void);

extern struct nvmet_subsys *nvmet_disc_subsys;
extern u64 nvmet_genctr;
extern struct rw_semaphore nvmet_config_sem;

bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys,
		const char *hostnqn);

#endif /* _NVMET_H */