summaryrefslogtreecommitdiff
path: root/drivers/infiniband/ulp/srpt/ib_srpt.h
blob: 389030487da7eecb521342e8a83859b39b3523a6 (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
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
/*
 * Copyright (c) 2006 - 2009 Mellanox Technology Inc.  All rights reserved.
 * Copyright (C) 2009 - 2010 Bart Van Assche <bvanassche@acm.org>.
 *
 * 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_SRPT_H
#define IB_SRPT_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/wait.h>

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

#include <scsi/srp.h>

#include "ib_dm_mad.h"

/*
 * The prefix the ServiceName field must start with in the device management
 * ServiceEntries attribute pair. See also the SRP specification.
 */
#define SRP_SERVICE_NAME_PREFIX		"SRP.T10:"

enum {
	/*
	 * SRP IOControllerProfile attributes for SRP target ports that have
	 * not been defined in <scsi/srp.h>. Source: section B.7, table B.7
	 * in the SRP specification.
	 */
	SRP_PROTOCOL = 0x0108,
	SRP_PROTOCOL_VERSION = 0x0001,
	SRP_IO_SUBCLASS = 0x609e,
	SRP_SEND_TO_IOC = 0x01,
	SRP_SEND_FROM_IOC = 0x02,
	SRP_RDMA_READ_FROM_IOC = 0x08,
	SRP_RDMA_WRITE_FROM_IOC = 0x20,

	/*
	 * srp_login_cmd.req_flags bitmasks. See also table 9 in the SRP
	 * specification.
	 */
	SRP_MTCH_ACTION = 0x03, /* MULTI-CHANNEL ACTION */
	SRP_LOSOLNT = 0x10, /* logout solicited notification */
	SRP_CRSOLNT = 0x20, /* credit request solicited notification */
	SRP_AESOLNT = 0x40, /* asynchronous event solicited notification */

	/*
	 * srp_cmd.sol_nt / srp_tsk_mgmt.sol_not bitmasks. See also tables
	 * 18 and 20 in the SRP specification.
	 */
	SRP_SCSOLNT = 0x02, /* SCSOLNT = successful solicited notification */
	SRP_UCSOLNT = 0x04, /* UCSOLNT = unsuccessful solicited notification */

	/*
	 * srp_rsp.sol_not / srp_t_logout.sol_not bitmasks. See also tables
	 * 16 and 22 in the SRP specification.
	 */
	SRP_SOLNT = 0x01, /* SOLNT = solicited notification */

	/* See also table 24 in the SRP specification. */
	SRP_TSK_MGMT_SUCCESS = 0x00,
	SRP_TSK_MGMT_FUNC_NOT_SUPP = 0x04,
	SRP_TSK_MGMT_FAILED = 0x05,

	/* See also table 21 in the SRP specification. */
	SRP_CMD_SIMPLE_Q = 0x0,
	SRP_CMD_HEAD_OF_Q = 0x1,
	SRP_CMD_ORDERED_Q = 0x2,
	SRP_CMD_ACA = 0x4,

	SRP_LOGIN_RSP_MULTICHAN_NO_CHAN = 0x0,
	SRP_LOGIN_RSP_MULTICHAN_TERMINATED = 0x1,
	SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,

	SRPT_DEF_SG_TABLESIZE = 128,
	SRPT_DEF_SG_PER_WQE = 16,

	MIN_SRPT_SQ_SIZE = 16,
	DEF_SRPT_SQ_SIZE = 4096,
	SRPT_RQ_SIZE = 128,
	MIN_SRPT_SRQ_SIZE = 4,
	DEFAULT_SRPT_SRQ_SIZE = 4095,
	MAX_SRPT_SRQ_SIZE = 65535,
	MAX_SRPT_RDMA_SIZE = 1U << 24,
	MAX_SRPT_RSP_SIZE = 1024,

	MIN_MAX_REQ_SIZE = 996,
	DEFAULT_MAX_REQ_SIZE
		= sizeof(struct srp_cmd)/*48*/
		+ sizeof(struct srp_indirect_buf)/*20*/
		+ 128 * sizeof(struct srp_direct_buf)/*16*/,

	MIN_MAX_RSP_SIZE = sizeof(struct srp_rsp)/*36*/ + 4,
	DEFAULT_MAX_RSP_SIZE = 256, /* leaves 220 bytes for sense data */

	DEFAULT_MAX_RDMA_SIZE = 65536,
};

/**
 * enum srpt_command_state - SCSI command state managed by SRPT.
 * @SRPT_STATE_NEW:           New command arrived and is being processed.
 * @SRPT_STATE_NEED_DATA:     Processing a write or bidir command and waiting
 *                            for data arrival.
 * @SRPT_STATE_DATA_IN:       Data for the write or bidir command arrived and is
 *                            being processed.
 * @SRPT_STATE_CMD_RSP_SENT:  SRP_RSP for SRP_CMD has been sent.
 * @SRPT_STATE_MGMT:          Processing a SCSI task management command.
 * @SRPT_STATE_MGMT_RSP_SENT: SRP_RSP for SRP_TSK_MGMT has been sent.
 * @SRPT_STATE_DONE:          Command processing finished successfully, command
 *                            processing has been aborted or command processing
 *                            failed.
 */
enum srpt_command_state {
	SRPT_STATE_NEW		 = 0,
	SRPT_STATE_NEED_DATA	 = 1,
	SRPT_STATE_DATA_IN	 = 2,
	SRPT_STATE_CMD_RSP_SENT	 = 3,
	SRPT_STATE_MGMT		 = 4,
	SRPT_STATE_MGMT_RSP_SENT = 5,
	SRPT_STATE_DONE		 = 6,
};

/**
 * struct srpt_ioctx - Shared SRPT I/O context information.
 * @buf:   Pointer to the buffer.
 * @dma:   DMA address of the buffer.
 * @index: Index of the I/O context in its ioctx_ring array.
 */
struct srpt_ioctx {
	struct ib_cqe		cqe;
	void			*buf;
	dma_addr_t		dma;
	uint32_t		index;
};

/**
 * struct srpt_recv_ioctx - SRPT receive I/O context.
 * @ioctx:     See above.
 * @wait_list: Node for insertion in srpt_rdma_ch.cmd_wait_list.
 */
struct srpt_recv_ioctx {
	struct srpt_ioctx	ioctx;
	struct list_head	wait_list;
};
	
struct srpt_rw_ctx {
	struct rdma_rw_ctx	rw;
	struct scatterlist	*sg;
	unsigned int		nents;
};

/**
 * struct srpt_send_ioctx - SRPT send I/O context.
 * @ioctx:       See above.
 * @ch:          Channel pointer.
 * @spinlock:    Protects 'state'.
 * @state:       I/O context state.
 * @cmd:         Target core command data structure.
 * @sense_data:  SCSI sense data.
 */
struct srpt_send_ioctx {
	struct srpt_ioctx	ioctx;
	struct srpt_rdma_ch	*ch;

	struct srpt_rw_ctx	s_rw_ctx;
	struct srpt_rw_ctx	*rw_ctxs;

	struct ib_cqe		rdma_cqe;
	struct list_head	free_list;
	spinlock_t		spinlock;
	enum srpt_command_state	state;
	struct se_cmd		cmd;
	struct completion	tx_done;
	u8			n_rdma;
	u8			n_rw_ctx;
	bool			queue_status_only;
	u8			sense_data[TRANSPORT_SENSE_BUFFER];
};

/**
 * enum rdma_ch_state - SRP channel state.
 * @CH_CONNECTING:    QP is in RTR state; waiting for RTU.
 * @CH_LIVE:	      QP is in RTS state.
 * @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
 *                    been received.
 * @CH_DRAINING:      DREP has been received or waiting for DREP timed out
 *                    and last work request has been queued.
 * @CH_DISCONNECTED:  Last completion has been received.
 */
enum rdma_ch_state {
	CH_CONNECTING,
	CH_LIVE,
	CH_DISCONNECTING,
	CH_DRAINING,
	CH_DISCONNECTED,
};

/**
 * struct srpt_rdma_ch - RDMA channel.
 * @cm_id:         IB CM ID associated with the channel.
 * @qp:            IB queue pair used for communicating over this channel.
 * @cq:            IB completion queue for this channel.
 * @rq_size:       IB receive queue size.
 * @rsp_size	   IB response message size in bytes.
 * @sq_wr_avail:   number of work requests available in the send queue.
 * @sport:         pointer to the information of the HCA port used by this
 *                 channel.
 * @i_port_id:     128-bit initiator port identifier copied from SRP_LOGIN_REQ.
 * @t_port_id:     128-bit target port identifier copied from SRP_LOGIN_REQ.
 * @max_ti_iu_len: maximum target-to-initiator information unit length.
 * @req_lim:       request limit: maximum number of requests that may be sent
 *                 by the initiator without having received a response.
 * @req_lim_delta: Number of credits not yet sent back to the initiator.
 * @spinlock:      Protects free_list and state.
 * @free_list:     Head of list with free send I/O contexts.
 * @state:         channel state. See also enum rdma_ch_state.
 * @ioctx_ring:    Send ring.
 * @list:          Node for insertion in the srpt_device.rch_list list.
 * @cmd_wait_list: List of SCSI commands that arrived before the RTU event. This
 *                 list contains struct srpt_ioctx elements and is protected
 *                 against concurrent modification by the cm_id spinlock.
 * @sess:          Session information associated with this SRP channel.
 * @sess_name:     Session name.
 * @release_work:  Allows scheduling of srpt_release_channel().
 * @release_done:  Enables waiting for srpt_release_channel() completion.
 */
struct srpt_rdma_ch {
	struct ib_cm_id		*cm_id;
	struct ib_qp		*qp;
	struct ib_cq		*cq;
	struct ib_cqe		zw_cqe;
	struct kref		kref;
	int			rq_size;
	u32			rsp_size;
	atomic_t		sq_wr_avail;
	struct srpt_port	*sport;
	u8			i_port_id[16];
	u8			t_port_id[16];
	int			max_ti_iu_len;
	atomic_t		req_lim;
	atomic_t		req_lim_delta;
	spinlock_t		spinlock;
	struct list_head	free_list;
	enum rdma_ch_state	state;
	struct srpt_send_ioctx	**ioctx_ring;
	struct list_head	list;
	struct list_head	cmd_wait_list;
	struct se_session	*sess;
	u8			sess_name[36];
	struct work_struct	release_work;
	struct completion	*release_done;
};

/**
 * struct srpt_port_attib - Attributes for SRPT port
 * @srp_max_rdma_size: Maximum size of SRP RDMA transfers for new connections.
 * @srp_max_rsp_size: Maximum size of SRP response messages in bytes.
 * @srp_sq_size: Shared receive queue (SRQ) size.
 */
struct srpt_port_attrib {
	u32			srp_max_rdma_size;
	u32			srp_max_rsp_size;
	u32			srp_sq_size;
};

/**
 * struct srpt_port - Information associated by SRPT with a single IB port.
 * @sdev:      backpointer to the HCA information.
 * @mad_agent: per-port management datagram processing information.
 * @enabled:   Whether or not this target port is enabled.
 * @port_guid: ASCII representation of Port GUID
 * @port:      one-based port number.
 * @sm_lid:    cached value of the port's sm_lid.
 * @lid:       cached value of the port's lid.
 * @gid:       cached value of the port's gid.
 * @port_acl_lock spinlock for port_acl_list:
 * @work:      work structure for refreshing the aforementioned cached values.
 * @port_tpg_1 Target portal group = 1 data.
 * @port_wwn:  Target core WWN data.
 * @port_acl_list: Head of the list with all node ACLs for this port.
 */
struct srpt_port {
	struct srpt_device	*sdev;
	struct ib_mad_agent	*mad_agent;
	bool			enabled;
	u8			port_guid[64];
	u8			port;
	u16			sm_lid;
	u16			lid;
	union ib_gid		gid;
	struct work_struct	work;
	struct se_portal_group	port_tpg_1;
	struct se_wwn		port_wwn;
	struct srpt_port_attrib port_attrib;
};

/**
 * struct srpt_device - Information associated by SRPT with a single HCA.
 * @device:        Backpointer to the struct ib_device managed by the IB core.
 * @pd:            IB protection domain.
 * @mr:            L_Key (local key) with write access to all local memory.
 * @srq:           Per-HCA SRQ (shared receive queue).
 * @cm_id:         Connection identifier.
 * @srq_size:      SRQ size.
 * @ioctx_ring:    Per-HCA SRQ.
 * @rch_list:      Per-device channel list -- see also srpt_rdma_ch.list.
 * @ch_releaseQ:   Enables waiting for removal from rch_list.
 * @mutex:         Protects rch_list.
 * @port:          Information about the ports owned by this HCA.
 * @event_handler: Per-HCA asynchronous IB event handler.
 * @list:          Node in srpt_dev_list.
 */
struct srpt_device {
	struct ib_device	*device;
	struct ib_pd		*pd;
	struct ib_srq		*srq;
	struct ib_cm_id		*cm_id;
	int			srq_size;
	struct srpt_recv_ioctx	**ioctx_ring;
	struct list_head	rch_list;
	wait_queue_head_t	ch_releaseQ;
	struct mutex		mutex;
	struct srpt_port	port[2];
	struct ib_event_handler	event_handler;
	struct list_head	list;
};

#endif				/* IB_SRPT_H */