summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/snic/snic.h
blob: 8ed778d4dbb9688864b20a34afaf9e724022d953 (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
/*
 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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 _SNIC_H_
#define _SNIC_H_

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/mempool.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>

#include "snic_disc.h"
#include "snic_io.h"
#include "snic_res.h"
#include "snic_trc.h"
#include "snic_stats.h"
#include "vnic_dev.h"
#include "vnic_wq.h"
#include "vnic_cq.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "vnic_snic.h"

#define SNIC_DRV_NAME		"snic"
#define SNIC_DRV_DESCRIPTION	"Cisco SCSI NIC Driver"
#define SNIC_DRV_VERSION	"0.0.1.18"
#define PFX			SNIC_DRV_NAME ":"
#define DFX			SNIC_DRV_NAME "%d: "

#define DESC_CLEAN_LOW_WATERMARK	8
#define SNIC_UCSM_DFLT_THROTTLE_CNT_BLD 16 /* UCSM default throttle count */
#define SNIC_MAX_IO_REQ			50 /* scsi_cmnd tag map entries */
#define SNIC_MIN_IO_REQ			8  /* Min IO throttle count */
#define SNIC_IO_LOCKS			64 /* IO locks: power of 2 */
#define SNIC_DFLT_QUEUE_DEPTH		32 /* Default Queue Depth */
#define SNIC_MAX_QUEUE_DEPTH		64 /* Max Queue Depth */
#define SNIC_DFLT_CMD_TIMEOUT		90 /* Extended tmo for FW */

/*
 * Tag bits used for special requests.
 */
#define SNIC_TAG_ABORT		BIT(30)		/* Tag indicating abort */
#define SNIC_TAG_DEV_RST	BIT(29)		/* Tag for device reset */
#define SNIC_TAG_IOCTL_DEV_RST	BIT(28)		/* Tag for User Device Reset */
#define SNIC_TAG_MASK		(BIT(24) - 1)	/* Mask for lookup */
#define SNIC_NO_TAG		-1

/*
 * Command flags to identify the type of command and for other future use
 */
#define SNIC_NO_FLAGS			0
#define SNIC_IO_INITIALIZED		BIT(0)
#define SNIC_IO_ISSUED			BIT(1)
#define SNIC_IO_DONE			BIT(2)
#define SNIC_IO_REQ_NULL		BIT(3)
#define SNIC_IO_ABTS_PENDING		BIT(4)
#define SNIC_IO_ABORTED			BIT(5)
#define SNIC_IO_ABTS_ISSUED		BIT(6)
#define SNIC_IO_TERM_ISSUED		BIT(7)
#define SNIC_IO_ABTS_TIMEDOUT		BIT(8)
#define SNIC_IO_ABTS_TERM_DONE		BIT(9)
#define SNIC_IO_ABTS_TERM_REQ_NULL	BIT(10)
#define SNIC_IO_ABTS_TERM_TIMEDOUT	BIT(11)
#define SNIC_IO_INTERNAL_TERM_PENDING	BIT(12)
#define SNIC_IO_INTERNAL_TERM_ISSUED	BIT(13)
#define SNIC_DEVICE_RESET		BIT(14)
#define SNIC_DEV_RST_ISSUED		BIT(15)
#define SNIC_DEV_RST_TIMEDOUT		BIT(16)
#define SNIC_DEV_RST_ABTS_ISSUED	BIT(17)
#define SNIC_DEV_RST_TERM_ISSUED	BIT(18)
#define SNIC_DEV_RST_DONE		BIT(19)
#define SNIC_DEV_RST_REQ_NULL		BIT(20)
#define SNIC_DEV_RST_ABTS_DONE		BIT(21)
#define SNIC_DEV_RST_TERM_DONE		BIT(22)
#define SNIC_DEV_RST_ABTS_PENDING	BIT(23)
#define SNIC_DEV_RST_PENDING		BIT(24)
#define SNIC_DEV_RST_NOTSUP		BIT(25)
#define SNIC_SCSI_CLEANUP		BIT(26)
#define SNIC_HOST_RESET_ISSUED		BIT(27)
#define SNIC_HOST_RESET_CMD_TERM	\
	(SNIC_DEV_RST_NOTSUP | SNIC_SCSI_CLEANUP | SNIC_HOST_RESET_ISSUED)

#define SNIC_ABTS_TIMEOUT		30000		/* msec */
#define SNIC_LUN_RESET_TIMEOUT		30000		/* msec */
#define SNIC_HOST_RESET_TIMEOUT		30000		/* msec */


/*
 * These are protected by the hashed req_lock.
 */
#define CMD_SP(Cmnd)		\
	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->rqi)
#define CMD_STATE(Cmnd)		\
	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->state)
#define CMD_ABTS_STATUS(Cmnd)	\
	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->abts_status)
#define CMD_LR_STATUS(Cmnd)	\
	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->lr_status)
#define CMD_FLAGS(Cmnd)	\
	(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->flags)

#define SNIC_INVALID_CODE 0x100	/* Hdr Status val unused by firmware */

#define SNIC_MAX_TARGET			256
#define SNIC_FLAGS_NONE			(0)

/* snic module params */
extern unsigned int snic_max_qdepth;

/* snic debugging */
extern unsigned int snic_log_level;

#define SNIC_MAIN_LOGGING	0x1
#define SNIC_SCSI_LOGGING	0x2
#define SNIC_ISR_LOGGING	0x8
#define SNIC_DESC_LOGGING	0x10

#define SNIC_CHECK_LOGGING(LEVEL, CMD)		\
do {						\
	if (unlikely(snic_log_level & LEVEL))	\
		do {				\
			CMD;			\
		} while (0);			\
} while (0)

#define SNIC_MAIN_DBG(host, fmt, args...)	\
	SNIC_CHECK_LOGGING(SNIC_MAIN_LOGGING,		\
		shost_printk(KERN_INFO, host, fmt, ## args);)

#define SNIC_SCSI_DBG(host, fmt, args...)	\
	SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING,		\
		shost_printk(KERN_INFO, host, fmt, ##args);)

#define SNIC_DISC_DBG(host, fmt, args...)	\
	SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING,		\
		shost_printk(KERN_INFO, host, fmt, ##args);)

#define SNIC_ISR_DBG(host, fmt, args...)	\
	SNIC_CHECK_LOGGING(SNIC_ISR_LOGGING,		\
		shost_printk(KERN_INFO, host, fmt, ##args);)

#define SNIC_HOST_ERR(host, fmt, args...)		\
	shost_printk(KERN_ERR, host, fmt, ##args)

#define SNIC_HOST_INFO(host, fmt, args...)		\
	shost_printk(KERN_INFO, host, fmt, ##args)

#define SNIC_INFO(fmt, args...)				\
	pr_info(PFX fmt, ## args)

#define SNIC_DBG(fmt, args...)				\
	pr_info(PFX fmt, ## args)

#define SNIC_ERR(fmt, args...)				\
	pr_err(PFX fmt, ## args)

#ifdef DEBUG
#define SNIC_BUG_ON(EXPR) \
	({ \
		if (EXPR) { \
			SNIC_ERR("SNIC BUG(%s)\n", #EXPR); \
			BUG_ON(EXPR); \
		} \
	})
#else
#define SNIC_BUG_ON(EXPR) \
	({ \
		if (EXPR) { \
			SNIC_ERR("SNIC BUG(%s) at %s : %d\n", \
				 #EXPR, __func__, __LINE__); \
			WARN_ON_ONCE(EXPR); \
		} \
	})
#endif

/* Soft assert */
#define SNIC_ASSERT_NOT_IMPL(EXPR) \
	({ \
		if (EXPR) {\
			SNIC_INFO("Functionality not impl'ed at %s:%d\n", \
				  __func__, __LINE__); \
			WARN_ON_ONCE(EXPR); \
		} \
	 })


extern const char *snic_state_str[];

enum snic_intx_intr_index {
	SNIC_INTX_WQ_RQ_COPYWQ,
	SNIC_INTX_ERR,
	SNIC_INTX_NOTIFY,
	SNIC_INTX_INTR_MAX,
};

enum snic_msix_intr_index {
	SNIC_MSIX_WQ,
	SNIC_MSIX_IO_CMPL,
	SNIC_MSIX_ERR_NOTIFY,
	SNIC_MSIX_INTR_MAX,
};

#define SNIC_INTRHDLR_NAMSZ	(2 * IFNAMSIZ)
struct snic_msix_entry {
	int requested;
	char devname[SNIC_INTRHDLR_NAMSZ];
	irqreturn_t (*isr)(int, void *);
	void *devid;
};

enum snic_state {
	SNIC_INIT = 0,
	SNIC_ERROR,
	SNIC_ONLINE,
	SNIC_OFFLINE,
	SNIC_FWRESET,
};

#define SNIC_WQ_MAX		1
#define SNIC_CQ_IO_CMPL_MAX	1
#define SNIC_CQ_MAX		(SNIC_WQ_MAX + SNIC_CQ_IO_CMPL_MAX)

/* firmware version information */
struct snic_fw_info {
	u32	fw_ver;
	u32	hid;			/* u16 hid | u16 vnic id */
	u32	max_concur_ios;		/* max concurrent ios */
	u32	max_sgs_per_cmd;	/* max sgls per IO */
	u32	max_io_sz;		/* max io size supported */
	u32	hba_cap;		/* hba capabilities */
	u32	max_tgts;		/* max tgts supported */
	u16	io_tmo;			/* FW Extended timeout */
	struct completion *wait;	/* protected by snic lock*/
};

/*
 * snic_work item : defined to process asynchronous events
 */
struct snic_work {
	struct work_struct work;
	u16	ev_id;
	u64	*ev_data;
};

/*
 * snic structure to represent SCSI vNIC
 */
struct snic {
	/* snic specific members */
	struct list_head list;
	char name[IFNAMSIZ];
	atomic_t state;
	spinlock_t snic_lock;
	struct completion *remove_wait;
	bool in_remove;
	bool stop_link_events;		/* stop processing link events */

	/* discovery related */
	struct snic_disc disc;

	/* Scsi Host info */
	struct Scsi_Host *shost;

	/* vnic related structures */
	struct vnic_dev_bar bar0;

	struct vnic_stats *stats;
	unsigned long stats_time;
	unsigned long stats_reset_time;

	struct vnic_dev *vdev;

	/* hw resource info */
	unsigned int wq_count;
	unsigned int cq_count;
	unsigned int intr_count;
	unsigned int err_intr_offset;

	int link_status; /* retrieved from svnic_dev_link_status() */
	u32 link_down_cnt;

	/* pci related */
	struct pci_dev *pdev;
	struct msix_entry msix_entry[SNIC_MSIX_INTR_MAX];
	struct snic_msix_entry msix[SNIC_MSIX_INTR_MAX];

	/* io related info */
	mempool_t *req_pool[SNIC_REQ_MAX_CACHES]; /* (??) */
	____cacheline_aligned spinlock_t io_req_lock[SNIC_IO_LOCKS];

	/* Maintain snic specific commands, cmds with no tag in spl_cmd_list */
	____cacheline_aligned spinlock_t spl_cmd_lock;
	struct list_head spl_cmd_list;

	unsigned int max_tag_id;
	atomic_t ios_inflight;		/* io in flight counter */

	struct vnic_snic_config config;

	struct work_struct link_work;

	/* firmware information */
	struct snic_fw_info fwinfo;

	/* Work for processing Target related work */
	struct work_struct tgt_work;

	/* Work for processing Discovery */
	struct work_struct disc_work;

	/* stats related */
	unsigned int reset_stats;
	atomic64_t io_cmpl_skip;
	struct snic_stats s_stats;	/* Per SNIC driver stats */

	/* platform specific */
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	struct dentry *stats_host;	/* Per snic debugfs root */
	struct dentry *stats_file;	/* Per snic debugfs file */
	struct dentry *reset_stats_file;/* Per snic reset stats file */
#endif

	/* completion queue cache line section */
	____cacheline_aligned struct vnic_cq cq[SNIC_CQ_MAX];

	/* work queue cache line section */
	____cacheline_aligned struct vnic_wq wq[SNIC_WQ_MAX];
	spinlock_t wq_lock[SNIC_WQ_MAX];

	/* interrupt resource cache line section */
	____cacheline_aligned struct vnic_intr intr[SNIC_MSIX_INTR_MAX];
}; /* end of snic structure */

/*
 * SNIC Driver's Global Data
 */
struct snic_global {
	struct list_head snic_list;
	spinlock_t snic_list_lock;

	struct kmem_cache *req_cache[SNIC_REQ_MAX_CACHES];

	struct workqueue_struct *event_q;

#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
	/* debugfs related global data */
	struct dentry *trc_root;
	struct dentry *stats_root;

	struct snic_trc trc ____cacheline_aligned;
#endif
};

extern struct snic_global *snic_glob;

int snic_glob_init(void);
void snic_glob_cleanup(void);

extern struct workqueue_struct *snic_event_queue;
extern struct device_attribute *snic_attrs[];

int snic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
int snic_abort_cmd(struct scsi_cmnd *);
int snic_device_reset(struct scsi_cmnd *);
int snic_host_reset(struct scsi_cmnd *);
int snic_reset(struct Scsi_Host *, struct scsi_cmnd *);
void snic_shutdown_scsi_cleanup(struct snic *);


int snic_request_intr(struct snic *);
void snic_free_intr(struct snic *);
int snic_set_intr_mode(struct snic *);
void snic_clear_intr_mode(struct snic *);

int snic_fwcq_cmpl_handler(struct snic *, int);
int snic_wq_cmpl_handler(struct snic *, int);
void snic_free_wq_buf(struct vnic_wq *, struct vnic_wq_buf *);


void snic_log_q_error(struct snic *);
void snic_handle_link_event(struct snic *);
void snic_handle_link(struct work_struct *);

int snic_queue_exch_ver_req(struct snic *);
int snic_io_exch_ver_cmpl_handler(struct snic *, struct snic_fw_req *);

int snic_queue_wq_desc(struct snic *, void *os_buf, u16 len);

void snic_handle_untagged_req(struct snic *, struct snic_req_info *);
void snic_release_untagged_req(struct snic *, struct snic_req_info *);
void snic_free_all_untagged_reqs(struct snic *);
int snic_get_conf(struct snic *);
void snic_set_state(struct snic *, enum snic_state);
int snic_get_state(struct snic *);
const char *snic_state_to_str(unsigned int);
void snic_hex_dump(char *, char *, int);
void snic_print_desc(const char *fn, char *os_buf, int len);
const char *show_opcode_name(int val);
#endif /* _SNIC_H */
OpenPOWER on IntegriCloud