summaryrefslogtreecommitdiff
path: root/drivers/infiniband/ulp/iser/iscsi_iser.h
blob: 9f0e0e34d6ca587af2c627c20fc141f6c0422b38 (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
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
/*
 * iSER transport for the Open iSCSI Initiator & iSER transport internals
 *
 * Copyright (C) 2004 Dmitry Yusupov
 * Copyright (C) 2004 Alex Aizman
 * Copyright (C) 2005 Mike Christie
 * based on code maintained by open-iscsi@googlegroups.com
 *
 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 * Copyright (c) 2013-2014 Mellanox Technologies. 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 __ISCSI_ISER_H__
#define __ISCSI_ISER_H__

#include <linux/types.h>
#include <linux/net.h>
#include <linux/printk.h>
#include <scsi/libiscsi.h>
#include <scsi/scsi_transport_iscsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>

#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/mempool.h>
#include <linux/uio.h>

#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_fmr_pool.h>
#include <rdma/rdma_cm.h>

#define DRV_NAME	"iser"
#define PFX		DRV_NAME ": "
#define DRV_VER		"1.4.1"

#define iser_dbg(fmt, arg...)				\
	do {						\
		if (iser_debug_level > 2)		\
			printk(KERN_DEBUG PFX "%s:" fmt,\
				__func__ , ## arg);	\
	} while (0)

#define iser_warn(fmt, arg...)				\
	do {						\
		if (iser_debug_level > 0)		\
			pr_warn(PFX "%s:" fmt,          \
				__func__ , ## arg);	\
	} while (0)

#define iser_info(fmt, arg...)				\
	do {						\
		if (iser_debug_level > 1)		\
			pr_info(PFX "%s:" fmt,          \
				__func__ , ## arg);	\
	} while (0)

#define iser_err(fmt, arg...)				\
	do {						\
		printk(KERN_ERR PFX "%s:" fmt,          \
		       __func__ , ## arg);		\
	} while (0)

#define SHIFT_4K	12
#define SIZE_4K	(1ULL << SHIFT_4K)
#define MASK_4K	(~(SIZE_4K-1))

					/* support up to 512KB in one RDMA */
#define ISCSI_ISER_SG_TABLESIZE         (0x80000 >> SHIFT_4K)
#define ISER_DEF_XMIT_CMDS_DEFAULT		512
#if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT
	#define ISER_DEF_XMIT_CMDS_MAX		ISCSI_DEF_XMIT_CMDS_MAX
#else
	#define ISER_DEF_XMIT_CMDS_MAX		ISER_DEF_XMIT_CMDS_DEFAULT
#endif
#define ISER_DEF_CMD_PER_LUN		ISER_DEF_XMIT_CMDS_MAX

/* QP settings */
/* Maximal bounds on received asynchronous PDUs */
#define ISER_MAX_RX_MISC_PDUS		4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */

#define ISER_MAX_TX_MISC_PDUS		6 /* NOOP_OUT(2), TEXT(1),         *
					   * SCSI_TMFUNC(2), LOGOUT(1) */

#define ISER_QP_MAX_RECV_DTOS		(ISER_DEF_XMIT_CMDS_MAX)

#define ISER_MIN_POSTED_RX		(ISER_DEF_XMIT_CMDS_MAX >> 2)

/* the max TX (send) WR supported by the iSER QP is defined by                 *
 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 * to have at max for SCSI command. The tx posting & completion handling code  *
 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 * send WR. D=8 comes from 64K/8K                                              */

#define ISER_INFLIGHT_DATAOUTS		8

#define ISER_QP_MAX_REQ_DTOS		(ISER_DEF_XMIT_CMDS_MAX *    \
					(1 + ISER_INFLIGHT_DATAOUTS) + \
					ISER_MAX_TX_MISC_PDUS        + \
					ISER_MAX_RX_MISC_PDUS)

/* Max registration work requests per command */
#define ISER_MAX_REG_WR_PER_CMD		5

/* For Signature we don't support DATAOUTs so no need to make room for them */
#define ISER_QP_SIG_MAX_REQ_DTOS	(ISER_DEF_XMIT_CMDS_MAX	*       \
					(1 + ISER_MAX_REG_WR_PER_CMD) + \
					ISER_MAX_TX_MISC_PDUS         + \
					ISER_MAX_RX_MISC_PDUS)

#define ISER_VER			0x10
#define ISER_WSV			0x08
#define ISER_RSV			0x04

#define ISER_FASTREG_LI_WRID		0xffffffffffffffffULL

struct iser_hdr {
	u8      flags;
	u8      rsvd[3];
	__be32  write_stag; /* write rkey */
	__be64  write_va;
	__be32  read_stag;  /* read rkey */
	__be64  read_va;
} __attribute__((packed));


#define ISER_ZBVA_NOT_SUPPORTED		0x80
#define ISER_SEND_W_INV_NOT_SUPPORTED	0x40

struct iser_cm_hdr {
	u8      flags;
	u8      rsvd[3];
} __packed;

/* Constant PDU lengths calculations */
#define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))

#define ISER_RECV_DATA_SEG_LEN	128
#define ISER_RX_PAYLOAD_SIZE	(ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
#define ISER_RX_LOGIN_SIZE	(ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)

/* Length of an object name string */
#define ISER_OBJECT_NAME_SIZE		    64

enum iser_ib_conn_state {
	ISER_CONN_INIT,		   /* descriptor allocd, no conn          */
	ISER_CONN_PENDING,	   /* in the process of being established */
	ISER_CONN_UP,		   /* up and running                      */
	ISER_CONN_TERMINATING,	   /* in the process of being terminated  */
	ISER_CONN_DOWN,		   /* shut down                           */
	ISER_CONN_STATES_NUM
};

enum iser_task_status {
	ISER_TASK_STATUS_INIT = 0,
	ISER_TASK_STATUS_STARTED,
	ISER_TASK_STATUS_COMPLETED
};

enum iser_data_dir {
	ISER_DIR_IN = 0,	   /* to initiator */
	ISER_DIR_OUT,		   /* from initiator */
	ISER_DIRS_NUM
};

struct iser_data_buf {
	void               *buf;      /* pointer to the sg list               */
	unsigned int       size;      /* num entries of this sg               */
	unsigned long      data_len;  /* total data len                       */
	unsigned int       dma_nents; /* returned by dma_map_sg               */
	char       	   *copy_buf; /* allocated copy buf for SGs unaligned *
	                               * for rdma which are copied            */
	struct scatterlist sg_single; /* SG-ified clone of a non SG SC or     *
				       * unaligned SG                         */
  };

/* fwd declarations */
struct iser_device;
struct iser_cq_desc;
struct iscsi_iser_task;
struct iscsi_endpoint;

struct iser_mem_reg {
	u32  lkey;
	u32  rkey;
	u64  va;
	u64  len;
	void *mem_h;
	int  is_mr;
};

struct iser_regd_buf {
	struct iser_mem_reg     reg;        /* memory registration info        */
	void                    *virt_addr;
	struct iser_device      *device;    /* device->device for dma_unmap    */
	enum dma_data_direction direction;  /* direction for dma_unmap	       */
	unsigned int            data_size;
};

enum iser_desc_type {
	ISCSI_TX_CONTROL ,
	ISCSI_TX_SCSI_COMMAND,
	ISCSI_TX_DATAOUT
};

struct iser_tx_desc {
	struct iser_hdr              iser_header;
	struct iscsi_hdr             iscsi_header;
	enum   iser_desc_type        type;
	u64		             dma_addr;
	/* sg[0] points to iser/iscsi headers, sg[1] optionally points to either
	of immediate data, unsolicited data-out or control (login,text) */
	struct ib_sge		     tx_sg[2];
	int                          num_sge;
};

#define ISER_RX_PAD_SIZE	(256 - (ISER_RX_PAYLOAD_SIZE + \
					sizeof(u64) + sizeof(struct ib_sge)))
struct iser_rx_desc {
	struct iser_hdr              iser_header;
	struct iscsi_hdr             iscsi_header;
	char		             data[ISER_RECV_DATA_SEG_LEN];
	u64		             dma_addr;
	struct ib_sge		     rx_sg;
	char		             pad[ISER_RX_PAD_SIZE];
} __attribute__((packed));

#define ISER_MAX_CQ 4

struct iser_conn;
struct iscsi_iser_task;

struct iser_device {
	struct ib_device             *ib_device;
	struct ib_pd	             *pd;
	struct ib_device_attr	     dev_attr;
	struct ib_cq	             *rx_cq[ISER_MAX_CQ];
	struct ib_cq	             *tx_cq[ISER_MAX_CQ];
	struct ib_mr	             *mr;
	struct tasklet_struct	     cq_tasklet[ISER_MAX_CQ];
	struct ib_event_handler      event_handler;
	struct list_head             ig_list; /* entry in ig devices list */
	int                          refcount;
	int                          cq_active_qps[ISER_MAX_CQ];
	int			     cqs_used;
	struct iser_cq_desc	     *cq_desc;
	int                          (*iser_alloc_rdma_reg_res)(struct iser_conn *ib_conn,
								unsigned cmds_max);
	void                         (*iser_free_rdma_reg_res)(struct iser_conn *ib_conn);
	int                          (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task,
							  enum iser_data_dir cmd_dir);
	void                         (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task,
							    enum iser_data_dir cmd_dir);
};

#define ISER_CHECK_GUARD	0xc0
#define ISER_CHECK_REFTAG	0x0f
#define ISER_CHECK_APPTAG	0x30

enum iser_reg_indicator {
	ISER_DATA_KEY_VALID	= 1 << 0,
	ISER_PROT_KEY_VALID	= 1 << 1,
	ISER_SIG_KEY_VALID	= 1 << 2,
	ISER_FASTREG_PROTECTED	= 1 << 3,
};

struct iser_pi_context {
	struct ib_mr                   *prot_mr;
	struct ib_fast_reg_page_list   *prot_frpl;
	struct ib_mr                   *sig_mr;
};

struct fast_reg_descriptor {
	struct list_head		  list;
	/* For fast registration - FRWR */
	struct ib_mr			 *data_mr;
	struct ib_fast_reg_page_list     *data_frpl;
	struct iser_pi_context		 *pi_ctx;
	/* registration indicators container */
	u8				  reg_indicators;
};

struct iser_conn {
	struct iscsi_conn	     *iscsi_conn;
	struct iscsi_endpoint	     *ep;
	enum iser_ib_conn_state	     state;	    /* rdma connection state   */
	atomic_t		     refcount;
	spinlock_t		     lock;	    /* used for state changes  */
	struct iser_device           *device;       /* device context          */
	struct rdma_cm_id            *cma_id;       /* CMA ID		       */
	struct ib_qp	             *qp;           /* QP 		       */
	unsigned		     qp_max_recv_dtos; /* num of rx buffers */
	unsigned		     qp_max_recv_dtos_mask; /* above minus 1 */
	unsigned		     min_posted_rx; /* qp_max_recv_dtos >> 2 */
	int                          post_recv_buf_count; /* posted rx count  */
	atomic_t                     post_send_buf_count; /* posted tx count   */
	char 			     name[ISER_OBJECT_NAME_SIZE];
	struct work_struct	     release_work;
	struct completion	     stop_completion;
	struct mutex		     state_mutex;
	struct completion	     flush_completion;
	struct completion	     up_completion;
	struct list_head	     conn_list;       /* entry in ig conn list */

	char  			     *login_buf;
	char			     *login_req_buf, *login_resp_buf;
	u64			     login_req_dma, login_resp_dma;
	unsigned int 		     rx_desc_head;
	struct iser_rx_desc	     *rx_descs;
	struct ib_recv_wr	     rx_wr[ISER_MIN_POSTED_RX];
	bool			     pi_support;

	/* Connection memory registration pool */
	union {
		struct {
			struct ib_fmr_pool      *pool;	   /* pool of IB FMRs         */
			struct iser_page_vec	*page_vec; /* represents SG to fmr maps*
							    * maps serialized as tx is*/
		} fmr;
		struct {
			struct list_head	pool;
			int			pool_size;
		} fastreg;
	};
};

struct iscsi_iser_task {
	struct iser_tx_desc          desc;
	struct iser_conn	     *ib_conn;
	enum iser_task_status 	     status;
	struct scsi_cmnd	     *sc;
	int                          command_sent;  /* set if command  sent  */
	int                          dir[ISER_DIRS_NUM];      /* set if dir use*/
	struct iser_regd_buf         rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
	struct iser_data_buf         data[ISER_DIRS_NUM];     /* orig. data des*/
	struct iser_data_buf         data_copy[ISER_DIRS_NUM];/* contig. copy  */
	struct iser_data_buf         prot[ISER_DIRS_NUM];     /* prot desc     */
	struct iser_data_buf         prot_copy[ISER_DIRS_NUM];/* prot copy     */
};

struct iser_page_vec {
	u64 *pages;
	int length;
	int offset;
	int data_size;
};

struct iser_cq_desc {
	struct iser_device           *device;
	int                          cq_index;
};

struct iser_global {
	struct mutex      device_list_mutex;/*                   */
	struct list_head  device_list;	     /* all iSER devices */
	struct mutex      connlist_mutex;
	struct list_head  connlist;		/* all iSER IB connections */

	struct kmem_cache *desc_cache;
};

extern struct iser_global ig;
extern int iser_debug_level;
extern bool iser_pi_enable;
extern int iser_pi_guard;

/* allocate connection resources needed for rdma functionality */
int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);

int iser_send_control(struct iscsi_conn *conn,
		      struct iscsi_task *task);

int iser_send_command(struct iscsi_conn *conn,
		      struct iscsi_task *task);

int iser_send_data_out(struct iscsi_conn *conn,
		       struct iscsi_task *task,
		       struct iscsi_data *hdr);

void iscsi_iser_recv(struct iscsi_conn *conn,
		     struct iscsi_hdr       *hdr,
		     char                   *rx_data,
		     int                    rx_data_len);

void iser_conn_init(struct iser_conn *ib_conn);

void iser_conn_release(struct iser_conn *ib_conn);

void iser_conn_terminate(struct iser_conn *ib_conn);

void iser_release_work(struct work_struct *work);

void iser_rcv_completion(struct iser_rx_desc *desc,
			 unsigned long    dto_xfer_len,
			struct iser_conn *ib_conn);

void iser_snd_completion(struct iser_tx_desc *desc, struct iser_conn *ib_conn);

void iser_task_rdma_init(struct iscsi_iser_task *task);

void iser_task_rdma_finalize(struct iscsi_iser_task *task);

void iser_free_rx_descriptors(struct iser_conn *ib_conn);

void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task,
				     struct iser_data_buf *mem,
				     struct iser_data_buf *mem_copy,
				     enum iser_data_dir cmd_dir);

int  iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task,
			   enum iser_data_dir cmd_dir);
int  iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
			       enum iser_data_dir cmd_dir);

int  iser_connect(struct iser_conn   *ib_conn,
		  struct sockaddr    *src_addr,
		  struct sockaddr    *dst_addr,
		  int                non_blocking);

int  iser_reg_page_vec(struct iser_conn     *ib_conn,
		       struct iser_page_vec *page_vec,
		       struct iser_mem_reg  *mem_reg);

void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
			enum iser_data_dir cmd_dir);
void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
			    enum iser_data_dir cmd_dir);

int  iser_post_recvl(struct iser_conn *ib_conn);
int  iser_post_recvm(struct iser_conn *ib_conn, int count);
int  iser_post_send(struct iser_conn *ib_conn, struct iser_tx_desc *tx_desc);

int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
			    struct iser_data_buf       *data,
			    enum   iser_data_dir       iser_dir,
			    enum   dma_data_direction  dma_dir);

void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
			      struct iser_data_buf *data);
int  iser_initialize_task_headers(struct iscsi_task *task,
			struct iser_tx_desc *tx_desc);
int iser_alloc_rx_descriptors(struct iser_conn *ib_conn, struct iscsi_session *session);
int iser_create_fmr_pool(struct iser_conn *ib_conn, unsigned cmds_max);
void iser_free_fmr_pool(struct iser_conn *ib_conn);
int iser_create_fastreg_pool(struct iser_conn *ib_conn, unsigned cmds_max);
void iser_free_fastreg_pool(struct iser_conn *ib_conn);
u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
			     enum iser_data_dir cmd_dir, sector_t *sector);
#endif