Free Electrons

Embedded Linux Experts

  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
/* bnx2i.c: Broadcom NetXtreme II iSCSI driver.
 *
 * Copyright (c) 2006 - 2009 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)
 */

#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	"2.0.1e"
#define DRV_MODULE_RELDATE	"June 22, 2009"

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>");
MODULE_DESCRIPTION("Broadcom NetXtreme II BCM5706/5708/5709 iSCSI Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

static DEFINE_MUTEX(bnx2i_dev_lock);

unsigned int event_coal_div = 1;
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, int, 0664);
MODULE_PARM_DESC(error_mask1, "Config FW iSCSI Error Mask #1");

unsigned int error_mask2 = 0x00;
module_param(error_mask2, int, 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;

static void bnx2i_unreg_one_device(struct bnx2i_hba *hba) ;


/**
 * bnx2i_identify_device - identifies NetXtreme II device type
 * @hba: 		Adapter structure pointer
 *
 * 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)
{
	hba->cnic_dev_type = 0;
	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 (hba->pci_did == PCI_DEVICE_ID_NX2_57710 ||
		   hba->pci_did == PCI_DEVICE_ID_NX2_57711)
		set_bit(BNX2I_NX2_DEV_57710, &hba->cnic_dev_type);
}


/**
 * 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;

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


/**
 * 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;

	/* check if cleanup happened in GOING_DOWN context */
	clear_bit(ADAPTER_STATE_UP, &hba->adapter_state);
	if (!test_and_clear_bit(ADAPTER_STATE_GOING_DOWN,
				&hba->adapter_state))
		iscsi_host_for_each_session(hba->shost,
					    bnx2i_drop_session);
}

/**
 * bnx2i_register_device - register bnx2i adapter instance with the cnic driver
 * @hba:	Adapter instance to register
 *
 * registers bnx2i adapter instance with the cnic driver while holding the
 *	adapter structure lock
 */
void bnx2i_register_device(struct bnx2i_hba *hba)
{
	int rc;

	if (test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state) ||
	    test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic)) {
		return;
	}

	rc = hba->cnic->register_device(hba->cnic, CNIC_ULP_ISCSI, hba);

	if (!rc)
		set_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
}


/**
 * bnx2i_reg_dev_all - registers all adapter instances with the cnic driver
 *
 * registers all bnx2i adapter instances with the cnic driver while holding
 *	the global resource lock
 */
void bnx2i_reg_dev_all(void)
{
	struct bnx2i_hba *hba, *temp;

	mutex_lock(&bnx2i_dev_lock);
	list_for_each_entry_safe(hba, temp, &adapter_list, link)
		bnx2i_register_device(hba);
	mutex_unlock(&bnx2i_dev_lock);
}


/**
 * bnx2i_unreg_one_device - unregister adapter instance with the cnic driver
 * @hba:	Adapter instance to unregister
 *
 * registers bnx2i adapter instance with the cnic driver while holding
 *	the adapter structure lock
 */
static void bnx2i_unreg_one_device(struct bnx2i_hba *hba)
{
	if (hba->ofld_conns_active ||
	    !test_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic) ||
	    test_bit(ADAPTER_STATE_GOING_DOWN, &hba->adapter_state))
		return;

	hba->cnic->unregister_device(hba->cnic, CNIC_ULP_ISCSI);

	/* ep_disconnect could come before NETDEV_DOWN, driver won't
	 * see NETDEV_DOWN as it already unregistered itself.
	 */
	hba->adapter_state = 0;
	clear_bit(BNX2I_CNIC_REGISTERED, &hba->reg_with_cnic);
}

/**
 * bnx2i_unreg_dev_all - unregisters all bnx2i instances with the cnic driver
 *
 * unregisters all bnx2i adapter instances with the cnic driver while holding
 *	the global resource lock
 */
void bnx2i_unreg_dev_all(void)
{
	struct bnx2i_hba *hba, *temp;

	mutex_lock(&bnx2i_dev_lock);
	list_for_each_entry_safe(hba, temp, &adapter_list, link)
		bnx2i_unreg_one_device(hba);
	mutex_unlock(&bnx2i_dev_lock);
}


/**
 * 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);
	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);

	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);
	} else
		hba->cnic = dev;
}


/**
 * 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_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;

	printk(KERN_INFO "%s", version);

	if (!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;
	}

	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;

	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)) {
			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);

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

module_init(bnx2i_mod_init);
module_exit(bnx2i_mod_exit);