summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/bnx2i/bnx2i_init.c
blob: ee009e4ad097949785c677b9b343f3eeb8abbc7a (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
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/* bnx2i.c: Broadcom NetXtreme II iSCSI driver.
 *
 * Copyright (c) 2006 - 2012 Broadcom Corporation
 * Copyright (c) 2007, 2008 Red Hat, Inc.  All rights reserved.
 * Copyright (c) 2007, 2008 Mike Christie
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Anil Veerabhadrappa (anilgv@broadcom.com)
 * Maintained by: Eddie Wai (eddie.wai@broadcom.com)
 */

#include "bnx2i.h"

static struct list_head adapter_list = LIST_HEAD_INIT(adapter_list);
static u32 adapter_count;

#define DRV_MODULE_NAME		"bnx2i"
#define DRV_MODULE_VERSION	"2.7.2.2"
#define DRV_MODULE_RELDATE	"Apr 25, 2012"

static char version[] __devinitdata =
		"Broadcom NetXtreme II iSCSI Driver " DRV_MODULE_NAME \
		" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";


MODULE_AUTHOR("Anil Veerabhadrappa <anilgv@broadcom.com> and "
	      "Eddie Wai <eddie.wai@broadcom.com>");

MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709/57710/57711/57712"
		   "/57800/57810/57840 iSCSI Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

static DEFINE_MUTEX(bnx2i_dev_lock);

unsigned int event_coal_min = 24;
module_param(event_coal_min, int, 0664);
MODULE_PARM_DESC(event_coal_min, "Event Coalescing Minimum Commands");

unsigned int event_coal_div = 2;
module_param(event_coal_div, int, 0664);
MODULE_PARM_DESC(event_coal_div, "Event Coalescing Divide Factor");

unsigned int en_tcp_dack = 1;
module_param(en_tcp_dack, int, 0664);
MODULE_PARM_DESC(en_tcp_dack, "Enable TCP Delayed ACK");

unsigned int error_mask1 = 0x00;
module_param(error_mask1, uint, 0664);
MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1");

unsigned int error_mask2 = 0x00;
module_param(error_mask2, uint, 0664);
MODULE_PARM_DESC(error_mask2, "Config FW iSCSI Error Mask #2");

unsigned int sq_size;
module_param(sq_size, int, 0664);
MODULE_PARM_DESC(sq_size, "Configure SQ size");

unsigned int rq_size = BNX2I_RQ_WQES_DEFAULT;
module_param(rq_size, int, 0664);
MODULE_PARM_DESC(rq_size, "Configure RQ size");

u64 iscsi_error_mask = 0x00;

DEFINE_PER_CPU(struct bnx2i_percpu_s, bnx2i_percpu);

static int bnx2i_cpu_callback(struct notifier_block *nfb,
			      unsigned long action, void *hcpu);
/* notification function for CPU hotplug events */
static struct notifier_block bnx2i_cpu_notifier = {
	.notifier_call = bnx2i_cpu_callback,
};


/**
 * bnx2i_identify_device - identifies NetXtreme II device type
 * @hba: 		Adapter structure pointer
 * @cnic:		Corresponding cnic device
 *
 * This function identifies the NX2 device type and sets appropriate
 *	queue mailbox register access method, 5709 requires driver to
 *	access MBOX regs using *bin* mode
 */
void bnx2i_identify_device(struct bnx2i_hba *hba, struct cnic_dev *dev)
{
	hba->cnic_dev_type = 0;
	if (test_bit(CNIC_F_BNX2_CLASS, &dev->flags)) {
		if (hba->pci_did == PCI_DEVICE_ID_NX2_5706 ||
		    hba->pci_did == PCI_DEVICE_ID_NX2_5706S) {
			set_bit(BNX2I_NX2_DEV_5706, &hba->cnic_dev_type);
		} else if (hba->pci_did == PCI_DEVICE_ID_NX2_5708 ||
		    hba->pci_did == PCI_DEVICE_ID_NX2_5708S) {
			set_bit(BNX2I_NX2_DEV_5708, &hba->cnic_dev_type);
		} else if (hba->pci_did == PCI_DEVICE_ID_NX2_5709 ||
		    hba->pci_did == PCI_DEVICE_ID_NX2_5709S) {
			set_bit(BNX2I_NX2_DEV_5709, &hba->cnic_dev_type);
			hba->mail_queue_access = BNX2I_MQ_BIN_MODE;
		}
	} else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {
		set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type);
	} else {
		printk(KERN_ALERT "bnx2i: unknown device, 0x%x\n",
				  hba->pci_did);
	}
}


/**
 * get_adapter_list_head - returns head of adapter list
 */
struct bnx2i_hba *get_adapter_list_head(void)
{
	struct bnx2i_hba *hba = NULL;
	struct bnx2i_hba *tmp_hba;

	if (!adapter_count)
		goto hba_not_found;

	mutex_lock(&bnx2i_dev_lock);
	list_for_each_entry(tmp_hba, &adapter_list, link) {
		if (tmp_hba->cnic && tmp_hba->cnic->cm_select_dev) {
			hba = tmp_hba;
			break;
		}
	}
	mutex_unlock(&bnx2i_dev_lock);
hba_not_found:
	return hba;
}


/**
 * bnx2i_find_hba_for_cnic - maps cnic device instance to bnx2i adapter instance
 * @cnic:	pointer to cnic device instance
 *
 */
struct bnx2i_hba *bnx2i_find_hba_for_cnic(struct cnic_dev *cnic)
{
	struct bnx2i_hba *hba, *temp;

	mutex_lock(&bnx2i_dev_lock);
	list_for_each_entry_safe(hba, temp, &adapter_list, link) {
		if (hba->cnic == cnic) {
			mutex_unlock(&bnx2i_dev_lock);
			return hba;
		}
	}
	mutex_unlock(&bnx2i_dev_lock);
	return NULL;
}


/**
 * bnx2i_start - cnic callback to initialize & start adapter instance
 * @handle:	transparent handle pointing to adapter structure
 *
 * This function maps adapter structure to pcidev structure and initiates
 *	firmware handshake to enable/initialize on chip iscsi components
 * 	This bnx2i - cnic interface api callback is issued after following
 *	2 conditions are met -
 *	  a) underlying network interface is up (marked by event 'NETDEV_UP'
 *		from netdev
 *	  b) bnx2i adapter instance is registered
 */
void bnx2i_start(void *handle)
{
#define BNX2I_INIT_POLL_TIME	(1000 / HZ)
	struct bnx2i_hba *hba = handle;
	int i = HZ;

	/*
	 * We should never register devices that don't support iSCSI
	 * (see bnx2i_init_one), so something is wrong if we try to
	 * start a iSCSI adapter on hardware with 0 supported iSCSI
	 * connections
	 */
	BUG_ON(!hba->cnic->max_iscsi_conn);

	bnx2i_send_fw_iscsi_init_msg(hba);
	while (!test_bit(ADAPTER_STATE_UP, &hba->adapter_state) && i--)
		msleep(BNX2I_INIT_POLL_TIME);
}


/**
 * bnx2i_chip_cleanup - local routine to handle chip cleanup
 * @hba:	Adapter instance to register
 *
 * Driver checks if adapter still has any active connections before
 *	executing the cleanup process
 */
static void bnx2i_chip_cleanup(struct bnx2i_hba *hba)
{
	struct bnx2i_endpoint *bnx2i_ep;
	struct list_head *pos, *tmp;

	if (hba->ofld_conns_active) {
		/* Stage to force the disconnection
		 * This is the case where the daemon is either slow or
		 * not present
		 */
		printk(KERN_ALERT "bnx2i: (%s) chip cleanup for %d active "
			"connections\n", hba->netdev->name,
			hba->ofld_conns_active);
		mutex_lock(&hba->net_dev_lock);
		list_for_each_safe(pos, tmp, &hba->ep_active_list) {
			bnx2i_ep = list_entry(pos, struct bnx2i_endpoint, link);
			/* Clean up the chip only */
			bnx2i_hw_ep_disconnect(bnx2i_ep);
			bnx2i_ep->cm_sk = NULL;
		}
		mutex_unlock(&hba->net_dev_lock);
	}
}


/**
 * bnx2i_stop - cnic callback to shutdown adapter instance
 * @handle:	transparent handle pointing to adapter structure
 *
 * driver checks if adapter is already in shutdown mode, if not start
 *	the shutdown process
 */
void bnx2i_stop(void *handle)
{
	struct bnx2i_hba *hba = handle;
	int conns_active;
	int wait_delay = 1 * HZ;

	/* check if cleanup happened in GOING_DOWN context */
	if (!test_and_set_bit(ADAPTER_STATE_GOING_DOWN,
			      &hba->adapter_state)) {
		iscsi_host_for_each_session(hba->shost,
					    bnx2i_drop_session);
		wait_delay = hba->hba_shutdown_tmo;
	}
	/* Wait for inflight offload connection tasks to complete before
	 * proceeding. Forcefully terminate all connection recovery in
	 * progress at the earliest, either in bind(), send_pdu(LOGIN),
	 * or conn_start()
	 */
	wait_event_interruptible_timeout(hba->eh_wait,
					 (list_empty(&hba->ep_ofld_list) &&
					 list_empty(&hba->ep_destroy_list)),
					 2 * HZ);
	/* Wait for all endpoints to be torn down, Chip will be reset once
	 *  control returns to network driver. So it is required to cleanup and
	 * release all connection resources before returning from this routine.
	 */
	while (hba->ofld_conns_active) {
		conns_active = hba->ofld_conns_active;
		wait_event_interruptible_timeout(hba->eh_wait,
				(hba->ofld_conns_active != conns_active),
				wait_delay);
		if (hba->ofld_conns_active == conns_active)
			break;
	}
	bnx2i_chip_cleanup(hba);

	/* This flag should be cleared last so that ep_disconnect() gracefully
	 * cleans up connection context
	 */
	clear_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state);
	clear_bit(ADAPTER_STATE_UP, &hba->adapter_state);
}


/**
 * bnx2i_init_one - initialize an adapter instance and allocate memory resources
 * @hba:	bnx2i adapter instance
 * @cnic:	cnic device handle
 *
 * Global resource lock is held during critical sections below. This routine is
 *	called from either cnic_register_driver() or device hot plug context and
 *	and does majority of device specific initialization
 */
static int bnx2i_init_one(struct bnx2i_hba *hba, struct cnic_dev *cnic)
{
	int rc;

	mutex_lock(&bnx2i_dev_lock);
	if (!cnic->max_iscsi_conn) {
		printk(KERN_ALERT "bnx2i: dev %s does not support "
			"iSCSI\n", hba->netdev->name);
		rc = -EOPNOTSUPP;
		goto out;
	}

	hba->cnic = cnic;
	rc = cnic->register_device(cnic, CNIC_ULP_ISCSI, hba);
	if (!rc) {
		hba->age++;
		set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
		list_add_tail(&hba->link, &adapter_list);
		adapter_count++;
	} else if (rc == -EBUSY) 	/* duplicate registration */
		printk(KERN_ALERT "bnx2i, duplicate registration"
				  "hba=%p, cnic=%p\n", hba, cnic);
	else if (rc == -EAGAIN)
		printk(KERN_ERR "bnx2i, driver not registered\n");
	else if (rc == -EINVAL)
		printk(KERN_ERR "bnx2i, invalid type %d\n", CNIC_ULP_ISCSI);
	else
		printk(KERN_ERR "bnx2i dev reg, unknown error, %d\n", rc);

out:
	mutex_unlock(&bnx2i_dev_lock);

	return rc;
}


/**
 * bnx2i_ulp_init - initialize an adapter instance
 * @dev:	cnic device handle
 *
 * Called from cnic_register_driver() context to initialize all enumerated
 *	cnic devices. This routine allocate adapter structure and other
 *	device specific resources.
 */
void bnx2i_ulp_init(struct cnic_dev *dev)
{
	struct bnx2i_hba *hba;

	/* Allocate a HBA structure for this device */
	hba = bnx2i_alloc_hba(dev);
	if (!hba) {
		printk(KERN_ERR "bnx2i init: hba initialization failed\n");
		return;
	}

	/* Get PCI related information and update hba struct members */
	clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
	if (bnx2i_init_one(hba, dev)) {
		printk(KERN_ERR "bnx2i - hba %p init failed\n", hba);
		bnx2i_free_hba(hba);
	}
}


/**
 * bnx2i_ulp_exit - shuts down adapter instance and frees all resources
 * @dev:	cnic device handle
 *
 */
void bnx2i_ulp_exit(struct cnic_dev *dev)
{
	struct bnx2i_hba *hba;

	hba = bnx2i_find_hba_for_cnic(dev);
	if (!hba) {
		printk(KERN_INFO "bnx2i_ulp_exit: hba not "
				 "found, dev 0x%p\n", dev);
		return;
	}
	mutex_lock(&bnx2i_dev_lock);
	list_del_init(&hba->link);
	adapter_count--;

	if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
		hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
		clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
	}
	mutex_unlock(&bnx2i_dev_lock);

	bnx2i_free_hba(hba);
}


/**
 * bnx2i_get_stats - Retrieve various statistic from iSCSI offload
 * @handle:	bnx2i_hba
 *
 * function callback exported via bnx2i - cnic driver interface to
 *      retrieve various iSCSI offload related statistics.
 */
int bnx2i_get_stats(void *handle)
{
	struct bnx2i_hba *hba = handle;
	struct iscsi_stats_info *stats;

	if (!hba)
		return -EINVAL;

	stats = (struct iscsi_stats_info *)hba->cnic->stats_addr;

	if (!stats)
		return -ENOMEM;

	strlcpy(stats->version, DRV_MODULE_VERSION, sizeof(stats->version));
	memcpy(stats->mac_add1 + 2, hba->cnic->mac_addr, ETH_ALEN);

	stats->max_frame_size = hba->netdev->mtu;
	stats->txq_size = hba->max_sqes;
	stats->rxq_size = hba->max_cqes;

	stats->txq_avg_depth = 0;
	stats->rxq_avg_depth = 0;

	GET_STATS_64(hba, stats, rx_pdus);
	GET_STATS_64(hba, stats, rx_bytes);

	GET_STATS_64(hba, stats, tx_pdus);
	GET_STATS_64(hba, stats, tx_bytes);

	return 0;
}


/**
 * bnx2i_percpu_thread_create - Create a receive thread for an
 *				online CPU
 *
 * @cpu:	cpu index for the online cpu
 */
static void bnx2i_percpu_thread_create(unsigned int cpu)
{
	struct bnx2i_percpu_s *p;
	struct task_struct *thread;

	p = &per_cpu(bnx2i_percpu, cpu);

	thread = kthread_create_on_node(bnx2i_percpu_io_thread, (void *)p,
					cpu_to_node(cpu),
					"bnx2i_thread/%d", cpu);
	/* bind thread to the cpu */
	if (likely(!IS_ERR(thread))) {
		kthread_bind(thread, cpu);
		p->iothread = thread;
		wake_up_process(thread);
	}
}


static void bnx2i_percpu_thread_destroy(unsigned int cpu)
{
	struct bnx2i_percpu_s *p;
	struct task_struct *thread;
	struct bnx2i_work *work, *tmp;

	/* Prevent any new work from being queued for this CPU */
	p = &per_cpu(bnx2i_percpu, cpu);
	spin_lock_bh(&p->p_work_lock);
	thread = p->iothread;
	p->iothread = NULL;

	/* Free all work in the list */
	list_for_each_entry_safe(work, tmp, &p->work_list, list) {
		list_del_init(&work->list);
		bnx2i_process_scsi_cmd_resp(work->session,
					    work->bnx2i_conn, &work->cqe);
		kfree(work);
	}

	spin_unlock_bh(&p->p_work_lock);
	if (thread)
		kthread_stop(thread);
}


/**
 * bnx2i_cpu_callback - Handler for CPU hotplug events
 *
 * @nfb:	The callback data block
 * @action:	The event triggering the callback
 * @hcpu:	The index of the CPU that the event is for
 *
 * This creates or destroys per-CPU data for iSCSI
 *
 * Returns NOTIFY_OK always.
 */
static int bnx2i_cpu_callback(struct notifier_block *nfb,
			      unsigned long action, void *hcpu)
{
	unsigned cpu = (unsigned long)hcpu;

	switch (action) {
	case CPU_ONLINE:
	case CPU_ONLINE_FROZEN:
		printk(KERN_INFO "bnx2i: CPU %x online: Create Rx thread\n",
			cpu);
		bnx2i_percpu_thread_create(cpu);
		break;
	case CPU_DEAD:
	case CPU_DEAD_FROZEN:
		printk(KERN_INFO "CPU %x offline: Remove Rx thread\n", cpu);
		bnx2i_percpu_thread_destroy(cpu);
		break;
	default:
		break;
	}
	return NOTIFY_OK;
}


/**
 * bnx2i_mod_init - module init entry point
 *
 * initialize any driver wide global data structures such as endpoint pool,
 *	tcp port manager/queue, sysfs. finally driver will register itself
 *	with the cnic module
 */
static int __init bnx2i_mod_init(void)
{
	int err;
	unsigned cpu = 0;
	struct bnx2i_percpu_s *p;

	printk(KERN_INFO "%s", version);

	if (sq_size && !is_power_of_2(sq_size))
		sq_size = roundup_pow_of_two(sq_size);

	mutex_init(&bnx2i_dev_lock);

	bnx2i_scsi_xport_template =
			iscsi_register_transport(&bnx2i_iscsi_transport);
	if (!bnx2i_scsi_xport_template) {
		printk(KERN_ERR "Could not register bnx2i transport.\n");
		err = -ENOMEM;
		goto out;
	}

	err = cnic_register_driver(CNIC_ULP_ISCSI, &bnx2i_cnic_cb);
	if (err) {
		printk(KERN_ERR "Could not register bnx2i cnic driver.\n");
		goto unreg_xport;
	}

	/* Create percpu kernel threads to handle iSCSI I/O completions */
	for_each_possible_cpu(cpu) {
		p = &per_cpu(bnx2i_percpu, cpu);
		INIT_LIST_HEAD(&p->work_list);
		spin_lock_init(&p->p_work_lock);
		p->iothread = NULL;
	}

	for_each_online_cpu(cpu)
		bnx2i_percpu_thread_create(cpu);

	/* Initialize per CPU interrupt thread */
	register_hotcpu_notifier(&bnx2i_cpu_notifier);

	return 0;

unreg_xport:
	iscsi_unregister_transport(&bnx2i_iscsi_transport);
out:
	return err;
}


/**
 * bnx2i_mod_exit - module cleanup/exit entry point
 *
 * Global resource lock and host adapter lock is held during critical sections
 *	in this function. Driver will browse through the adapter list, cleans-up
 *	each instance, unregisters iscsi transport name and finally driver will
 *	unregister itself with the cnic module
 */
static void __exit bnx2i_mod_exit(void)
{
	struct bnx2i_hba *hba;
	unsigned cpu = 0;

	mutex_lock(&bnx2i_dev_lock);
	while (!list_empty(&adapter_list)) {
		hba = list_entry(adapter_list.next, struct bnx2i_hba, link);
		list_del(&hba->link);
		adapter_count--;

		if (test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
			bnx2i_chip_cleanup(hba);
			hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);
			clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
		}

		bnx2i_free_hba(hba);
	}
	mutex_unlock(&bnx2i_dev_lock);

	unregister_hotcpu_notifier(&bnx2i_cpu_notifier);

	for_each_online_cpu(cpu)
		bnx2i_percpu_thread_destroy(cpu);

	iscsi_unregister_transport(&bnx2i_iscsi_transport);
	cnic_unregister_driver(CNIC_ULP_ISCSI);
}

module_init(bnx2i_mod_init);
module_exit(bnx2i_mod_exit);