summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/csiostor/csio_scsi.h
blob: 2257c3dcf724843f520624aace59f6aca1e5c8db (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
/*
 * This file is part of the Chelsio FCoE driver for Linux.
 *
 * Copyright (c) 2008-2012 Chelsio Communications, Inc. 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 __CSIO_SCSI_H__
#define __CSIO_SCSI_H__

#include <linux/spinlock_types.h>
#include <linux/completion.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_tcq.h>
#include <scsi/fc/fc_fcp.h>

#include "csio_defs.h"
#include "csio_wr.h"

extern struct scsi_host_template csio_fcoe_shost_template;
extern struct scsi_host_template csio_fcoe_shost_vport_template;

extern int csio_scsi_eqsize;
extern int csio_scsi_iqlen;
extern int csio_scsi_ioreqs;
extern uint32_t csio_max_scan_tmo;
extern uint32_t csio_delta_scan_tmo;
extern int csio_lun_qdepth;

/*
 **************************** NOTE *******************************
 * How do we calculate MAX FCoE SCSI SGEs? Here is the math:
 * Max Egress WR size = 512 bytes
 * One SCSI egress WR has the following fixed no of bytes:
 *      48 (sizeof(struct fw_scsi_write[read]_wr)) - FW WR
 *    + 32 (sizeof(struct fc_fcp_cmnd)) - Immediate FCP_CMD
 *    ------
 *      80
 *    ------
 * That leaves us with 512 - 96 = 432 bytes for data SGE. Using
 * struct ulptx_sgl header for the SGE consumes:
 *	- 4 bytes for cmnd_sge.
 *	- 12 bytes for the first SGL.
 * That leaves us with 416 bytes for the remaining SGE pairs. Which is
 * is 416 / 24 (size(struct ulptx_sge_pair)) = 17 SGE pairs,
 * or 34 SGEs. Adding the first SGE fetches us 35 SGEs.
 */
#define CSIO_SCSI_MAX_SGE		35
#define CSIO_SCSI_ABRT_TMO_MS		60000
#define CSIO_SCSI_LUNRST_TMO_MS		60000
#define CSIO_SCSI_TM_POLL_MS		2000	/* should be less than
						 * all TM timeouts.
						 */
#define CSIO_SCSI_IQ_WRSZ		128
#define CSIO_SCSI_IQSIZE		(csio_scsi_iqlen * CSIO_SCSI_IQ_WRSZ)

#define	CSIO_MAX_SNS_LEN		128
#define	CSIO_SCSI_RSP_LEN	(FCP_RESP_WITH_EXT + 4 + CSIO_MAX_SNS_LEN)

/* Reference to scsi_cmnd */
#define csio_scsi_cmnd(req)		((req)->scratch1)

struct csio_scsi_stats {
	uint64_t		n_tot_success;	/* Total number of good I/Os */
	uint32_t		n_rn_nr_error;	/* No. of remote-node-not-
						 * ready errors
						 */
	uint32_t		n_hw_nr_error;	/* No. of hw-module-not-
						 * ready errors
						 */
	uint32_t		n_dmamap_error;	/* No. of DMA map erros */
	uint32_t		n_unsupp_sge_error; /* No. of too-many-SGes
						     * errors.
						     */
	uint32_t		n_no_req_error;	/* No. of Out-of-ioreqs error */
	uint32_t		n_busy_error;	/* No. of -EBUSY errors */
	uint32_t		n_hosterror;	/* No. of FW_HOSTERROR I/O */
	uint32_t		n_rsperror;	/* No. of response errors */
	uint32_t		n_autosense;	/* No. of auto sense replies */
	uint32_t		n_ovflerror;	/* No. of overflow errors */
	uint32_t		n_unflerror;	/* No. of underflow errors */
	uint32_t		n_rdev_nr_error;/* No. of rdev not
						 * ready errors
						 */
	uint32_t		n_rdev_lost_error;/* No. of rdev lost errors */
	uint32_t		n_rdev_logo_error;/* No. of rdev logo errors */
	uint32_t		n_link_down_error;/* No. of link down errors */
	uint32_t		n_no_xchg_error; /* No. no exchange error */
	uint32_t		n_unknown_error;/* No. of unhandled errors */
	uint32_t		n_aborted;	/* No. of aborted I/Os */
	uint32_t		n_abrt_timedout; /* No. of abort timedouts */
	uint32_t		n_abrt_fail;	/* No. of abort failures */
	uint32_t		n_abrt_dups;	/* No. of duplicate aborts */
	uint32_t		n_abrt_race_comp; /* No. of aborts that raced
						   * with completions.
						   */
	uint32_t		n_abrt_busy_error;/* No. of abort failures
						   * due to -EBUSY.
						   */
	uint32_t		n_closed;	/* No. of closed I/Os */
	uint32_t		n_cls_busy_error; /* No. of close failures
						   * due to -EBUSY.
						   */
	uint32_t		n_active;	/* No. of IOs in active_q */
	uint32_t		n_tm_active;	/* No. of TMs in active_q */
	uint32_t		n_wcbfn;	/* No. of I/Os in worker
						 * cbfn q
						 */
	uint32_t		n_free_ioreq;	/* No. of freelist entries */
	uint32_t		n_free_ddp;	/* No. of DDP freelist */
	uint32_t		n_unaligned;	/* No. of Unaligned SGls */
	uint32_t		n_inval_cplop;	/* No. invalid CPL op's in IQ */
	uint32_t		n_inval_scsiop;	/* No. invalid scsi op's in IQ*/
};

struct csio_scsim {
	struct csio_hw		*hw;		/* Pointer to HW moduel */
	uint8_t			max_sge;	/* Max SGE */
	uint8_t			proto_cmd_len;	/* Proto specific SCSI
						 * cmd length
						 */
	uint16_t		proto_rsp_len;	/* Proto specific SCSI
						 * response length
						 */
	spinlock_t		freelist_lock;	/* Lock for ioreq freelist */
	struct list_head	active_q;	/* Outstanding SCSI I/Os */
	struct list_head	ioreq_freelist;	/* Free list of ioreq's */
	struct list_head	ddp_freelist;	/* DDP descriptor freelist */
	struct csio_scsi_stats	stats;		/* This module's statistics */
};

/* State machine defines */
enum csio_scsi_ev {
	CSIO_SCSIE_START_IO = 1,		/* Start a regular SCSI IO */
	CSIO_SCSIE_START_TM,			/* Start a TM IO */
	CSIO_SCSIE_COMPLETED,			/* IO Completed */
	CSIO_SCSIE_ABORT,			/* Abort IO */
	CSIO_SCSIE_ABORTED,			/* IO Aborted */
	CSIO_SCSIE_CLOSE,			/* Close exchange */
	CSIO_SCSIE_CLOSED,			/* Exchange closed */
	CSIO_SCSIE_DRVCLEANUP,			/* Driver wants to manually
						 * cleanup this I/O.
						 */
};

enum csio_scsi_lev {
	CSIO_LEV_ALL = 1,
	CSIO_LEV_LNODE,
	CSIO_LEV_RNODE,
	CSIO_LEV_LUN,
};

struct csio_scsi_level_data {
	enum csio_scsi_lev	level;
	struct csio_rnode	*rnode;
	struct csio_lnode	*lnode;
	uint64_t		oslun;
};

static inline struct csio_ioreq *
csio_get_scsi_ioreq(struct csio_scsim *scm)
{
	struct csio_sm *req;

	if (likely(!list_empty(&scm->ioreq_freelist))) {
		req = list_first_entry(&scm->ioreq_freelist,
				       struct csio_sm, sm_list);
		list_del_init(&req->sm_list);
		CSIO_DEC_STATS(scm, n_free_ioreq);
		return (struct csio_ioreq *)req;
	} else
		return NULL;
}

static inline void
csio_put_scsi_ioreq(struct csio_scsim *scm, struct csio_ioreq *ioreq)
{
	list_add_tail(&ioreq->sm.sm_list, &scm->ioreq_freelist);
	CSIO_INC_STATS(scm, n_free_ioreq);
}

static inline void
csio_put_scsi_ioreq_list(struct csio_scsim *scm, struct list_head *reqlist,
			 int n)
{
	list_splice_init(reqlist, &scm->ioreq_freelist);
	scm->stats.n_free_ioreq += n;
}

static inline struct csio_dma_buf *
csio_get_scsi_ddp(struct csio_scsim *scm)
{
	struct csio_dma_buf *ddp;

	if (likely(!list_empty(&scm->ddp_freelist))) {
		ddp = list_first_entry(&scm->ddp_freelist,
				       struct csio_dma_buf, list);
		list_del_init(&ddp->list);
		CSIO_DEC_STATS(scm, n_free_ddp);
		return ddp;
	} else
		return NULL;
}

static inline void
csio_put_scsi_ddp(struct csio_scsim *scm, struct csio_dma_buf *ddp)
{
	list_add_tail(&ddp->list, &scm->ddp_freelist);
	CSIO_INC_STATS(scm, n_free_ddp);
}

static inline void
csio_put_scsi_ddp_list(struct csio_scsim *scm, struct list_head *reqlist,
			 int n)
{
	list_splice_tail_init(reqlist, &scm->ddp_freelist);
	scm->stats.n_free_ddp += n;
}

static inline void
csio_scsi_completed(struct csio_ioreq *ioreq, struct list_head *cbfn_q)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_COMPLETED);
	if (csio_list_deleted(&ioreq->sm.sm_list))
		list_add_tail(&ioreq->sm.sm_list, cbfn_q);
}

static inline void
csio_scsi_aborted(struct csio_ioreq *ioreq, struct list_head *cbfn_q)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_ABORTED);
	list_add_tail(&ioreq->sm.sm_list, cbfn_q);
}

static inline void
csio_scsi_closed(struct csio_ioreq *ioreq, struct list_head *cbfn_q)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_CLOSED);
	list_add_tail(&ioreq->sm.sm_list, cbfn_q);
}

static inline void
csio_scsi_drvcleanup(struct csio_ioreq *ioreq)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_DRVCLEANUP);
}

/*
 * csio_scsi_start_io - Kick starts the IO SM.
 * @req: io request SM.
 *
 * needs to be called with lock held.
 */
static inline int
csio_scsi_start_io(struct csio_ioreq *ioreq)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_START_IO);
	return ioreq->drv_status;
}

/*
 * csio_scsi_start_tm - Kicks off the Task management IO SM.
 * @req: io request SM.
 *
 * needs to be called with lock held.
 */
static inline int
csio_scsi_start_tm(struct csio_ioreq *ioreq)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_START_TM);
	return ioreq->drv_status;
}

/*
 * csio_scsi_abort - Abort an IO request
 * @req: io request SM.
 *
 * needs to be called with lock held.
 */
static inline int
csio_scsi_abort(struct csio_ioreq *ioreq)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_ABORT);
	return ioreq->drv_status;
}

/*
 * csio_scsi_close - Close an IO request
 * @req: io request SM.
 *
 * needs to be called with lock held.
 */
static inline int
csio_scsi_close(struct csio_ioreq *ioreq)
{
	csio_post_event(&ioreq->sm, CSIO_SCSIE_CLOSE);
	return ioreq->drv_status;
}

void csio_scsi_cleanup_io_q(struct csio_scsim *, struct list_head *);
int csio_scsim_cleanup_io(struct csio_scsim *, bool abort);
int csio_scsim_cleanup_io_lnode(struct csio_scsim *,
					  struct csio_lnode *);
struct csio_ioreq *csio_scsi_cmpl_handler(struct csio_hw *, void *, uint32_t,
					  struct csio_fl_dma_buf *,
					  void *, uint8_t **);
int csio_scsi_qconfig(struct csio_hw *);
int csio_scsim_init(struct csio_scsim *, struct csio_hw *);
void csio_scsim_exit(struct csio_scsim *);

#endif /* __CSIO_SCSI_H__ */
OpenPOWER on IntegriCloud