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Merge branch 'linus' of master.kernel.org:/pub/scm/linux/kernel/git/perex/alsa
[deliverable/linux.git] / drivers / s390 / scsi / zfcp_aux.c
1 /*
2 * This file is part of the zfcp device driver for
3 * FCP adapters for IBM System z9 and zSeries.
4 *
5 * (C) Copyright IBM Corp. 2002, 2006
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 /*
23 * Driver authors:
24 * Martin Peschke (originator of the driver)
25 * Raimund Schroeder
26 * Aron Zeh
27 * Wolfgang Taphorn
28 * Stefan Bader
29 * Heiko Carstens (kernel 2.6 port of the driver)
30 * Andreas Herrmann
31 * Maxim Shchetynin
32 * Volker Sameske
33 * Ralph Wuerthner
34 */
35
36 #include "zfcp_ext.h"
37
38 /* accumulated log level (module parameter) */
39 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
40 static char *device;
41 /*********************** FUNCTION PROTOTYPES *********************************/
42
43 /* written against the module interface */
44 static int __init zfcp_module_init(void);
45
46 /* FCP related */
47 static void zfcp_ns_gid_pn_handler(unsigned long);
48
49 /* miscellaneous */
50 static int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
51 static void zfcp_sg_list_free(struct zfcp_sg_list *);
52 static int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
53 void __user *, size_t);
54 static int zfcp_sg_list_copy_to_user(void __user *,
55 struct zfcp_sg_list *, size_t);
56 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
57
58 #define ZFCP_CFDC_IOC_MAGIC 0xDD
59 #define ZFCP_CFDC_IOC \
60 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
61
62
63 static const struct file_operations zfcp_cfdc_fops = {
64 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
65 #ifdef CONFIG_COMPAT
66 .compat_ioctl = zfcp_cfdc_dev_ioctl
67 #endif
68 };
69
70 static struct miscdevice zfcp_cfdc_misc = {
71 .minor = ZFCP_CFDC_DEV_MINOR,
72 .name = ZFCP_CFDC_DEV_NAME,
73 .fops = &zfcp_cfdc_fops
74 };
75
76 /*********************** KERNEL/MODULE PARAMETERS ***************************/
77
78 /* declare driver module init/cleanup functions */
79 module_init(zfcp_module_init);
80
81 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
82 MODULE_DESCRIPTION
83 ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
84 MODULE_LICENSE("GPL");
85
86 module_param(device, charp, 0400);
87 MODULE_PARM_DESC(device, "specify initial device");
88
89 module_param(loglevel, uint, 0400);
90 MODULE_PARM_DESC(loglevel,
91 "log levels, 8 nibbles: "
92 "FC ERP QDIO CIO Config FSF SCSI Other, "
93 "levels: 0=none 1=normal 2=devel 3=trace");
94
95 /****************************************************************/
96 /************** Functions without logging ***********************/
97 /****************************************************************/
98
99 void
100 _zfcp_hex_dump(char *addr, int count)
101 {
102 int i;
103 for (i = 0; i < count; i++) {
104 printk("%02x", addr[i]);
105 if ((i % 4) == 3)
106 printk(" ");
107 if ((i % 32) == 31)
108 printk("\n");
109 }
110 if (((i-1) % 32) != 31)
111 printk("\n");
112 }
113
114
115 /****************************************************************/
116 /****** Functions to handle the request ID hash table ********/
117 /****************************************************************/
118
119 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FSF
120
121 static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
122 {
123 int idx;
124
125 adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
126 GFP_KERNEL);
127 if (!adapter->req_list)
128 return -ENOMEM;
129
130 for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
131 INIT_LIST_HEAD(&adapter->req_list[idx]);
132 return 0;
133 }
134
135 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
136 {
137 kfree(adapter->req_list);
138 }
139
140 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
141 {
142 unsigned int idx;
143
144 for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
145 if (!list_empty(&adapter->req_list[idx]))
146 return 0;
147 return 1;
148 }
149
150 #undef ZFCP_LOG_AREA
151
152 /****************************************************************/
153 /************** Uncategorised Functions *************************/
154 /****************************************************************/
155
156 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
157
158 /**
159 * zfcp_device_setup - setup function
160 * @str: pointer to parameter string
161 *
162 * Parse "device=..." parameter string.
163 */
164 static int __init
165 zfcp_device_setup(char *devstr)
166 {
167 char *tmp, *str;
168 size_t len;
169
170 if (!devstr)
171 return 0;
172
173 len = strlen(devstr) + 1;
174 str = kmalloc(len, GFP_KERNEL);
175 if (!str)
176 goto err_out;
177 memcpy(str, devstr, len);
178
179 tmp = strchr(str, ',');
180 if (!tmp)
181 goto err_out;
182 *tmp++ = '\0';
183 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
184 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
185
186 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
187 if (*tmp++ != ',')
188 goto err_out;
189 if (*tmp == '\0')
190 goto err_out;
191
192 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
193 if (*tmp != '\0')
194 goto err_out;
195 kfree(str);
196 return 1;
197
198 err_out:
199 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
200 kfree(str);
201 return 0;
202 }
203
204 static void __init
205 zfcp_init_device_configure(void)
206 {
207 struct zfcp_adapter *adapter;
208 struct zfcp_port *port;
209 struct zfcp_unit *unit;
210
211 down(&zfcp_data.config_sema);
212 read_lock_irq(&zfcp_data.config_lock);
213 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
214 if (adapter)
215 zfcp_adapter_get(adapter);
216 read_unlock_irq(&zfcp_data.config_lock);
217
218 if (adapter == NULL)
219 goto out_adapter;
220 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
221 if (!port)
222 goto out_port;
223 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
224 if (!unit)
225 goto out_unit;
226 up(&zfcp_data.config_sema);
227 ccw_device_set_online(adapter->ccw_device);
228 zfcp_erp_wait(adapter);
229 down(&zfcp_data.config_sema);
230 zfcp_unit_put(unit);
231 out_unit:
232 zfcp_port_put(port);
233 out_port:
234 zfcp_adapter_put(adapter);
235 out_adapter:
236 up(&zfcp_data.config_sema);
237 return;
238 }
239
240 static int calc_alignment(int size)
241 {
242 int align = 1;
243
244 if (!size)
245 return 0;
246
247 while ((size - align) > 0)
248 align <<= 1;
249
250 return align;
251 }
252
253 static int __init
254 zfcp_module_init(void)
255 {
256 int retval = -ENOMEM;
257 int size, align;
258
259 size = sizeof(struct zfcp_fsf_req_qtcb);
260 align = calc_alignment(size);
261 zfcp_data.fsf_req_qtcb_cache =
262 kmem_cache_create("zfcp_fsf", size, align, 0, NULL);
263 if (!zfcp_data.fsf_req_qtcb_cache)
264 goto out;
265
266 size = sizeof(struct fsf_status_read_buffer);
267 align = calc_alignment(size);
268 zfcp_data.sr_buffer_cache =
269 kmem_cache_create("zfcp_sr", size, align, 0, NULL);
270 if (!zfcp_data.sr_buffer_cache)
271 goto out_sr_cache;
272
273 size = sizeof(struct zfcp_gid_pn_data);
274 align = calc_alignment(size);
275 zfcp_data.gid_pn_cache =
276 kmem_cache_create("zfcp_gid", size, align, 0, NULL);
277 if (!zfcp_data.gid_pn_cache)
278 goto out_gid_cache;
279
280 atomic_set(&zfcp_data.loglevel, loglevel);
281
282 /* initialize adapter list */
283 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
284
285 /* initialize adapters to be removed list head */
286 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
287
288 zfcp_data.scsi_transport_template =
289 fc_attach_transport(&zfcp_transport_functions);
290 if (!zfcp_data.scsi_transport_template)
291 goto out_transport;
292
293 retval = misc_register(&zfcp_cfdc_misc);
294 if (retval != 0) {
295 ZFCP_LOG_INFO("registration of misc device "
296 "zfcp_cfdc failed\n");
297 goto out_misc;
298 }
299
300 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
301 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
302
303 /* Initialise proc semaphores */
304 sema_init(&zfcp_data.config_sema, 1);
305
306 /* initialise configuration rw lock */
307 rwlock_init(&zfcp_data.config_lock);
308
309 /* setup dynamic I/O */
310 retval = zfcp_ccw_register();
311 if (retval) {
312 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
313 goto out_ccw_register;
314 }
315
316 if (zfcp_device_setup(device))
317 zfcp_init_device_configure();
318
319 goto out;
320
321 out_ccw_register:
322 misc_deregister(&zfcp_cfdc_misc);
323 out_misc:
324 fc_release_transport(zfcp_data.scsi_transport_template);
325 out_transport:
326 kmem_cache_destroy(zfcp_data.gid_pn_cache);
327 out_gid_cache:
328 kmem_cache_destroy(zfcp_data.sr_buffer_cache);
329 out_sr_cache:
330 kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
331 out:
332 return retval;
333 }
334
335 /*
336 * function: zfcp_cfdc_dev_ioctl
337 *
338 * purpose: Handle control file upload/download transaction via IOCTL
339 * interface
340 *
341 * returns: 0 - Operation completed successfuly
342 * -ENOTTY - Unknown IOCTL command
343 * -EINVAL - Invalid sense data record
344 * -ENXIO - The FCP adapter is not available
345 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
346 * -ENOMEM - Insufficient memory
347 * -EFAULT - User space memory I/O operation fault
348 * -EPERM - Cannot create or queue FSF request or create SBALs
349 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
350 */
351 static long
352 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
353 unsigned long buffer)
354 {
355 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
356 struct zfcp_adapter *adapter = NULL;
357 struct zfcp_fsf_req *fsf_req = NULL;
358 struct zfcp_sg_list *sg_list = NULL;
359 u32 fsf_command, option;
360 char *bus_id = NULL;
361 int retval = 0;
362
363 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
364 if (sense_data == NULL) {
365 retval = -ENOMEM;
366 goto out;
367 }
368
369 sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
370 if (sg_list == NULL) {
371 retval = -ENOMEM;
372 goto out;
373 }
374
375 if (command != ZFCP_CFDC_IOC) {
376 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
377 retval = -ENOTTY;
378 goto out;
379 }
380
381 if ((sense_data_user = (void __user *) buffer) == NULL) {
382 ZFCP_LOG_INFO("sense data record is required\n");
383 retval = -EINVAL;
384 goto out;
385 }
386
387 retval = copy_from_user(sense_data, sense_data_user,
388 sizeof(struct zfcp_cfdc_sense_data));
389 if (retval) {
390 retval = -EFAULT;
391 goto out;
392 }
393
394 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
395 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
396 ZFCP_CFDC_SIGNATURE);
397 retval = -EINVAL;
398 goto out;
399 }
400
401 switch (sense_data->command) {
402
403 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
404 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
405 option = FSF_CFDC_OPTION_NORMAL_MODE;
406 break;
407
408 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
409 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
410 option = FSF_CFDC_OPTION_FORCE;
411 break;
412
413 case ZFCP_CFDC_CMND_FULL_ACCESS:
414 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
415 option = FSF_CFDC_OPTION_FULL_ACCESS;
416 break;
417
418 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
419 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
420 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
421 break;
422
423 case ZFCP_CFDC_CMND_UPLOAD:
424 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
425 option = 0;
426 break;
427
428 default:
429 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
430 sense_data->command);
431 retval = -EINVAL;
432 goto out;
433 }
434
435 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
436 if (bus_id == NULL) {
437 retval = -ENOMEM;
438 goto out;
439 }
440 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
441 (sense_data->devno >> 24),
442 (sense_data->devno >> 16) & 0xFF,
443 (sense_data->devno & 0xFFFF));
444
445 read_lock_irq(&zfcp_data.config_lock);
446 adapter = zfcp_get_adapter_by_busid(bus_id);
447 if (adapter)
448 zfcp_adapter_get(adapter);
449 read_unlock_irq(&zfcp_data.config_lock);
450
451 kfree(bus_id);
452
453 if (adapter == NULL) {
454 ZFCP_LOG_INFO("invalid adapter\n");
455 retval = -ENXIO;
456 goto out;
457 }
458
459 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
460 retval = zfcp_sg_list_alloc(sg_list,
461 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
462 if (retval) {
463 retval = -ENOMEM;
464 goto out;
465 }
466 }
467
468 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
469 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
470 retval = zfcp_sg_list_copy_from_user(
471 sg_list, &sense_data_user->control_file,
472 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
473 if (retval) {
474 retval = -EFAULT;
475 goto out;
476 }
477 }
478
479 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
480 option, sg_list);
481 if (retval)
482 goto out;
483
484 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
485 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
486 retval = -ENXIO;
487 goto out;
488 }
489
490 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
491 memcpy(&sense_data->fsf_status_qual,
492 &fsf_req->qtcb->header.fsf_status_qual,
493 sizeof(union fsf_status_qual));
494 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
495
496 retval = copy_to_user(sense_data_user, sense_data,
497 sizeof(struct zfcp_cfdc_sense_data));
498 if (retval) {
499 retval = -EFAULT;
500 goto out;
501 }
502
503 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
504 retval = zfcp_sg_list_copy_to_user(
505 &sense_data_user->control_file, sg_list,
506 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
507 if (retval) {
508 retval = -EFAULT;
509 goto out;
510 }
511 }
512
513 out:
514 if (fsf_req != NULL)
515 zfcp_fsf_req_free(fsf_req);
516
517 if ((adapter != NULL) && (retval != -ENXIO))
518 zfcp_adapter_put(adapter);
519
520 if (sg_list != NULL) {
521 zfcp_sg_list_free(sg_list);
522 kfree(sg_list);
523 }
524
525 kfree(sense_data);
526
527 return retval;
528 }
529
530
531 /**
532 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
533 * @sg_list: structure describing a scatter gather list
534 * @size: size of scatter-gather list
535 * Return: 0 on success, else -ENOMEM
536 *
537 * In sg_list->sg a pointer to the created scatter-gather list is returned,
538 * or NULL if we run out of memory. sg_list->count specifies the number of
539 * elements of the scatter-gather list. The maximum size of a single element
540 * in the scatter-gather list is PAGE_SIZE.
541 */
542 static int
543 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
544 {
545 struct scatterlist *sg;
546 unsigned int i;
547 int retval = 0;
548 void *address;
549
550 BUG_ON(sg_list == NULL);
551
552 sg_list->count = size >> PAGE_SHIFT;
553 if (size & ~PAGE_MASK)
554 sg_list->count++;
555 sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
556 GFP_KERNEL);
557 if (sg_list->sg == NULL) {
558 sg_list->count = 0;
559 retval = -ENOMEM;
560 goto out;
561 }
562
563 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
564 sg->length = min(size, PAGE_SIZE);
565 sg->offset = 0;
566 address = (void *) get_zeroed_page(GFP_KERNEL);
567 if (address == NULL) {
568 sg_list->count = i;
569 zfcp_sg_list_free(sg_list);
570 retval = -ENOMEM;
571 goto out;
572 }
573 zfcp_address_to_sg(address, sg);
574 size -= sg->length;
575 }
576
577 out:
578 return retval;
579 }
580
581
582 /**
583 * zfcp_sg_list_free - free memory of a scatter-gather list
584 * @sg_list: structure describing a scatter-gather list
585 *
586 * Memory for each element in the scatter-gather list is freed.
587 * Finally sg_list->sg is freed itself and sg_list->count is reset.
588 */
589 static void
590 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
591 {
592 struct scatterlist *sg;
593 unsigned int i;
594
595 BUG_ON(sg_list == NULL);
596
597 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
598 free_page((unsigned long) zfcp_sg_to_address(sg));
599
600 sg_list->count = 0;
601 kfree(sg_list->sg);
602 }
603
604 /**
605 * zfcp_sg_size - determine size of a scatter-gather list
606 * @sg: array of (struct scatterlist)
607 * @sg_count: elements in array
608 * Return: size of entire scatter-gather list
609 */
610 static size_t zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
611 {
612 unsigned int i;
613 struct scatterlist *p;
614 size_t size;
615
616 size = 0;
617 for (i = 0, p = sg; i < sg_count; i++, p++) {
618 BUG_ON(p == NULL);
619 size += p->length;
620 }
621
622 return size;
623 }
624
625
626 /**
627 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
628 * @sg_list: structure describing a scatter-gather list
629 * @user_buffer: pointer to buffer in user space
630 * @size: number of bytes to be copied
631 * Return: 0 on success, -EFAULT if copy_from_user fails.
632 */
633 static int
634 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
635 void __user *user_buffer,
636 size_t size)
637 {
638 struct scatterlist *sg;
639 unsigned int length;
640 void *zfcp_buffer;
641 int retval = 0;
642
643 BUG_ON(sg_list == NULL);
644
645 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
646 return -EFAULT;
647
648 for (sg = sg_list->sg; size > 0; sg++) {
649 length = min((unsigned int)size, sg->length);
650 zfcp_buffer = zfcp_sg_to_address(sg);
651 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
652 retval = -EFAULT;
653 goto out;
654 }
655 user_buffer += length;
656 size -= length;
657 }
658
659 out:
660 return retval;
661 }
662
663
664 /**
665 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
666 * @user_buffer: pointer to buffer in user space
667 * @sg_list: structure describing a scatter-gather list
668 * @size: number of bytes to be copied
669 * Return: 0 on success, -EFAULT if copy_to_user fails
670 */
671 static int
672 zfcp_sg_list_copy_to_user(void __user *user_buffer,
673 struct zfcp_sg_list *sg_list,
674 size_t size)
675 {
676 struct scatterlist *sg;
677 unsigned int length;
678 void *zfcp_buffer;
679 int retval = 0;
680
681 BUG_ON(sg_list == NULL);
682
683 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
684 return -EFAULT;
685
686 for (sg = sg_list->sg; size > 0; sg++) {
687 length = min((unsigned int) size, sg->length);
688 zfcp_buffer = zfcp_sg_to_address(sg);
689 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
690 retval = -EFAULT;
691 goto out;
692 }
693 user_buffer += length;
694 size -= length;
695 }
696
697 out:
698 return retval;
699 }
700
701
702 #undef ZFCP_LOG_AREA
703
704 /****************************************************************/
705 /****** Functions for configuration/set-up of structures ********/
706 /****************************************************************/
707
708 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
709
710 /**
711 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
712 * @port: pointer to port to search for unit
713 * @fcp_lun: FCP LUN to search for
714 * Traverse list of all units of a port and return pointer to a unit
715 * with the given FCP LUN.
716 */
717 struct zfcp_unit *
718 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
719 {
720 struct zfcp_unit *unit;
721 int found = 0;
722
723 list_for_each_entry(unit, &port->unit_list_head, list) {
724 if ((unit->fcp_lun == fcp_lun) &&
725 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
726 {
727 found = 1;
728 break;
729 }
730 }
731 return found ? unit : NULL;
732 }
733
734 /**
735 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
736 * @adapter: pointer to adapter to search for port
737 * @wwpn: wwpn to search for
738 * Traverse list of all ports of an adapter and return pointer to a port
739 * with the given wwpn.
740 */
741 struct zfcp_port *
742 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
743 {
744 struct zfcp_port *port;
745 int found = 0;
746
747 list_for_each_entry(port, &adapter->port_list_head, list) {
748 if ((port->wwpn == wwpn) &&
749 !(atomic_read(&port->status) &
750 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
751 found = 1;
752 break;
753 }
754 }
755 return found ? port : NULL;
756 }
757
758 /**
759 * zfcp_get_port_by_did - find port in port list of adapter by d_id
760 * @adapter: pointer to adapter to search for port
761 * @d_id: d_id to search for
762 * Traverse list of all ports of an adapter and return pointer to a port
763 * with the given d_id.
764 */
765 struct zfcp_port *
766 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
767 {
768 struct zfcp_port *port;
769 int found = 0;
770
771 list_for_each_entry(port, &adapter->port_list_head, list) {
772 if ((port->d_id == d_id) &&
773 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
774 {
775 found = 1;
776 break;
777 }
778 }
779 return found ? port : NULL;
780 }
781
782 /**
783 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
784 * @bus_id: bus_id to search for
785 * Traverse list of all adapters and return pointer to an adapter
786 * with the given bus_id.
787 */
788 struct zfcp_adapter *
789 zfcp_get_adapter_by_busid(char *bus_id)
790 {
791 struct zfcp_adapter *adapter;
792 int found = 0;
793
794 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
795 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
796 BUS_ID_SIZE) == 0) &&
797 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
798 &adapter->status)){
799 found = 1;
800 break;
801 }
802 }
803 return found ? adapter : NULL;
804 }
805
806 /**
807 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
808 * @port: pointer to port where unit is added
809 * @fcp_lun: FCP LUN of unit to be enqueued
810 * Return: pointer to enqueued unit on success, NULL on error
811 * Locks: config_sema must be held to serialize changes to the unit list
812 *
813 * Sets up some unit internal structures and creates sysfs entry.
814 */
815 struct zfcp_unit *
816 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
817 {
818 struct zfcp_unit *unit;
819
820 /*
821 * check that there is no unit with this FCP_LUN already in list
822 * and enqueue it.
823 * Note: Unlike for the adapter and the port, this is an error
824 */
825 read_lock_irq(&zfcp_data.config_lock);
826 unit = zfcp_get_unit_by_lun(port, fcp_lun);
827 read_unlock_irq(&zfcp_data.config_lock);
828 if (unit)
829 return NULL;
830
831 unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
832 if (!unit)
833 return NULL;
834
835 /* initialise reference count stuff */
836 atomic_set(&unit->refcount, 0);
837 init_waitqueue_head(&unit->remove_wq);
838
839 unit->port = port;
840 unit->fcp_lun = fcp_lun;
841
842 /* setup for sysfs registration */
843 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
844 unit->sysfs_device.parent = &port->sysfs_device;
845 unit->sysfs_device.release = zfcp_sysfs_unit_release;
846 dev_set_drvdata(&unit->sysfs_device, unit);
847
848 init_waitqueue_head(&unit->scsi_scan_wq);
849
850 /* mark unit unusable as long as sysfs registration is not complete */
851 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
852
853 if (device_register(&unit->sysfs_device)) {
854 kfree(unit);
855 return NULL;
856 }
857
858 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
859 device_unregister(&unit->sysfs_device);
860 return NULL;
861 }
862
863 zfcp_unit_get(unit);
864 unit->scsi_lun = scsilun_to_int((struct scsi_lun *)&unit->fcp_lun);
865
866 write_lock_irq(&zfcp_data.config_lock);
867 list_add_tail(&unit->list, &port->unit_list_head);
868 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
869 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
870 write_unlock_irq(&zfcp_data.config_lock);
871
872 port->units++;
873 zfcp_port_get(port);
874
875 return unit;
876 }
877
878 void
879 zfcp_unit_dequeue(struct zfcp_unit *unit)
880 {
881 zfcp_unit_wait(unit);
882 write_lock_irq(&zfcp_data.config_lock);
883 list_del(&unit->list);
884 write_unlock_irq(&zfcp_data.config_lock);
885 unit->port->units--;
886 zfcp_port_put(unit->port);
887 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
888 device_unregister(&unit->sysfs_device);
889 }
890
891 /*
892 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
893 * commands.
894 * It also genrates fcp-nameserver request/response buffer and unsolicited
895 * status read fsf_req buffers.
896 *
897 * locks: must only be called with zfcp_data.config_sema taken
898 */
899 static int
900 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
901 {
902 adapter->pool.fsf_req_erp =
903 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
904 zfcp_data.fsf_req_qtcb_cache);
905 if (!adapter->pool.fsf_req_erp)
906 return -ENOMEM;
907
908 adapter->pool.fsf_req_scsi =
909 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
910 zfcp_data.fsf_req_qtcb_cache);
911 if (!adapter->pool.fsf_req_scsi)
912 return -ENOMEM;
913
914 adapter->pool.fsf_req_abort =
915 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
916 zfcp_data.fsf_req_qtcb_cache);
917 if (!adapter->pool.fsf_req_abort)
918 return -ENOMEM;
919
920 adapter->pool.fsf_req_status_read =
921 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
922 sizeof(struct zfcp_fsf_req));
923 if (!adapter->pool.fsf_req_status_read)
924 return -ENOMEM;
925
926 adapter->pool.data_status_read =
927 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
928 zfcp_data.sr_buffer_cache);
929 if (!adapter->pool.data_status_read)
930 return -ENOMEM;
931
932 adapter->pool.data_gid_pn =
933 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
934 zfcp_data.gid_pn_cache);
935 if (!adapter->pool.data_gid_pn)
936 return -ENOMEM;
937
938 return 0;
939 }
940
941 /**
942 * zfcp_free_low_mem_buffers - free memory pools of an adapter
943 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
944 * locking: zfcp_data.config_sema must be held
945 */
946 static void
947 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
948 {
949 if (adapter->pool.fsf_req_erp)
950 mempool_destroy(adapter->pool.fsf_req_erp);
951 if (adapter->pool.fsf_req_scsi)
952 mempool_destroy(adapter->pool.fsf_req_scsi);
953 if (adapter->pool.fsf_req_abort)
954 mempool_destroy(adapter->pool.fsf_req_abort);
955 if (adapter->pool.fsf_req_status_read)
956 mempool_destroy(adapter->pool.fsf_req_status_read);
957 if (adapter->pool.data_status_read)
958 mempool_destroy(adapter->pool.data_status_read);
959 if (adapter->pool.data_gid_pn)
960 mempool_destroy(adapter->pool.data_gid_pn);
961 }
962
963 static void zfcp_dummy_release(struct device *dev)
964 {
965 return;
966 }
967
968 /*
969 * Enqueues an adapter at the end of the adapter list in the driver data.
970 * All adapter internal structures are set up.
971 * Proc-fs entries are also created.
972 *
973 * returns: 0 if a new adapter was successfully enqueued
974 * ZFCP_KNOWN if an adapter with this devno was already present
975 * -ENOMEM if alloc failed
976 * locks: config_sema must be held to serialise changes to the adapter list
977 */
978 struct zfcp_adapter *
979 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
980 {
981 int retval = 0;
982 struct zfcp_adapter *adapter;
983
984 /*
985 * Note: It is safe to release the list_lock, as any list changes
986 * are protected by the config_sema, which must be held to get here
987 */
988
989 /* try to allocate new adapter data structure (zeroed) */
990 adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
991 if (!adapter) {
992 ZFCP_LOG_INFO("error: allocation of base adapter "
993 "structure failed\n");
994 goto out;
995 }
996
997 ccw_device->handler = NULL;
998
999 /* save ccw_device pointer */
1000 adapter->ccw_device = ccw_device;
1001
1002 retval = zfcp_qdio_allocate_queues(adapter);
1003 if (retval)
1004 goto queues_alloc_failed;
1005
1006 retval = zfcp_qdio_allocate(adapter);
1007 if (retval)
1008 goto qdio_allocate_failed;
1009
1010 retval = zfcp_allocate_low_mem_buffers(adapter);
1011 if (retval) {
1012 ZFCP_LOG_INFO("error: pool allocation failed\n");
1013 goto failed_low_mem_buffers;
1014 }
1015
1016 /* initialise reference count stuff */
1017 atomic_set(&adapter->refcount, 0);
1018 init_waitqueue_head(&adapter->remove_wq);
1019
1020 /* initialise list of ports */
1021 INIT_LIST_HEAD(&adapter->port_list_head);
1022
1023 /* initialise list of ports to be removed */
1024 INIT_LIST_HEAD(&adapter->port_remove_lh);
1025
1026 /* initialize list of fsf requests */
1027 spin_lock_init(&adapter->req_list_lock);
1028 retval = zfcp_reqlist_alloc(adapter);
1029 if (retval) {
1030 ZFCP_LOG_INFO("request list initialization failed\n");
1031 goto failed_low_mem_buffers;
1032 }
1033
1034 /* initialize debug locks */
1035
1036 spin_lock_init(&adapter->erp_dbf_lock);
1037 spin_lock_init(&adapter->hba_dbf_lock);
1038 spin_lock_init(&adapter->san_dbf_lock);
1039 spin_lock_init(&adapter->scsi_dbf_lock);
1040
1041 retval = zfcp_adapter_debug_register(adapter);
1042 if (retval)
1043 goto debug_register_failed;
1044
1045 /* initialize error recovery stuff */
1046
1047 rwlock_init(&adapter->erp_lock);
1048 sema_init(&adapter->erp_ready_sem, 0);
1049 INIT_LIST_HEAD(&adapter->erp_ready_head);
1050 INIT_LIST_HEAD(&adapter->erp_running_head);
1051
1052 /* initialize abort lock */
1053 rwlock_init(&adapter->abort_lock);
1054
1055 /* initialise some erp stuff */
1056 init_waitqueue_head(&adapter->erp_thread_wqh);
1057 init_waitqueue_head(&adapter->erp_done_wqh);
1058
1059 /* initialize lock of associated request queue */
1060 rwlock_init(&adapter->request_queue.queue_lock);
1061
1062 /* mark adapter unusable as long as sysfs registration is not complete */
1063 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1064
1065 dev_set_drvdata(&ccw_device->dev, adapter);
1066
1067 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1068 goto sysfs_failed;
1069
1070 adapter->generic_services.parent = &adapter->ccw_device->dev;
1071 adapter->generic_services.release = zfcp_dummy_release;
1072 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1073 "generic_services");
1074
1075 if (device_register(&adapter->generic_services))
1076 goto generic_services_failed;
1077
1078 /* put allocated adapter at list tail */
1079 write_lock_irq(&zfcp_data.config_lock);
1080 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1081 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1082 write_unlock_irq(&zfcp_data.config_lock);
1083
1084 zfcp_data.adapters++;
1085
1086 goto out;
1087
1088 generic_services_failed:
1089 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1090 sysfs_failed:
1091 zfcp_adapter_debug_unregister(adapter);
1092 debug_register_failed:
1093 dev_set_drvdata(&ccw_device->dev, NULL);
1094 zfcp_reqlist_free(adapter);
1095 failed_low_mem_buffers:
1096 zfcp_free_low_mem_buffers(adapter);
1097 if (qdio_free(ccw_device) != 0)
1098 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1099 zfcp_get_busid_by_adapter(adapter));
1100 qdio_allocate_failed:
1101 zfcp_qdio_free_queues(adapter);
1102 queues_alloc_failed:
1103 kfree(adapter);
1104 adapter = NULL;
1105 out:
1106 return adapter;
1107 }
1108
1109 /*
1110 * returns: 0 - struct zfcp_adapter data structure successfully removed
1111 * !0 - struct zfcp_adapter data structure could not be removed
1112 * (e.g. still used)
1113 * locks: adapter list write lock is assumed to be held by caller
1114 */
1115 void
1116 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1117 {
1118 int retval = 0;
1119 unsigned long flags;
1120
1121 zfcp_adapter_scsi_unregister(adapter);
1122 device_unregister(&adapter->generic_services);
1123 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1124 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1125 /* sanity check: no pending FSF requests */
1126 spin_lock_irqsave(&adapter->req_list_lock, flags);
1127 retval = zfcp_reqlist_isempty(adapter);
1128 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1129 if (!retval) {
1130 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1131 "%i requests outstanding\n",
1132 zfcp_get_busid_by_adapter(adapter), adapter,
1133 atomic_read(&adapter->reqs_active));
1134 retval = -EBUSY;
1135 goto out;
1136 }
1137
1138 zfcp_adapter_debug_unregister(adapter);
1139
1140 /* remove specified adapter data structure from list */
1141 write_lock_irq(&zfcp_data.config_lock);
1142 list_del(&adapter->list);
1143 write_unlock_irq(&zfcp_data.config_lock);
1144
1145 /* decrease number of adapters in list */
1146 zfcp_data.adapters--;
1147
1148 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1149 "%i adapters still in list\n",
1150 zfcp_get_busid_by_adapter(adapter),
1151 adapter, zfcp_data.adapters);
1152
1153 retval = qdio_free(adapter->ccw_device);
1154 if (retval)
1155 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1156 zfcp_get_busid_by_adapter(adapter));
1157
1158 zfcp_free_low_mem_buffers(adapter);
1159 /* free memory of adapter data structure and queues */
1160 zfcp_qdio_free_queues(adapter);
1161 zfcp_reqlist_free(adapter);
1162 kfree(adapter->fc_stats);
1163 kfree(adapter->stats_reset_data);
1164 ZFCP_LOG_TRACE("freeing adapter structure\n");
1165 kfree(adapter);
1166 out:
1167 return;
1168 }
1169
1170 /**
1171 * zfcp_port_enqueue - enqueue port to port list of adapter
1172 * @adapter: adapter where remote port is added
1173 * @wwpn: WWPN of the remote port to be enqueued
1174 * @status: initial status for the port
1175 * @d_id: destination id of the remote port to be enqueued
1176 * Return: pointer to enqueued port on success, NULL on error
1177 * Locks: config_sema must be held to serialize changes to the port list
1178 *
1179 * All port internal structures are set up and the sysfs entry is generated.
1180 * d_id is used to enqueue ports with a well known address like the Directory
1181 * Service for nameserver lookup.
1182 */
1183 struct zfcp_port *
1184 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1185 u32 d_id)
1186 {
1187 struct zfcp_port *port;
1188 int check_wwpn;
1189
1190 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1191 /*
1192 * check that there is no port with this WWPN already in list
1193 */
1194 if (check_wwpn) {
1195 read_lock_irq(&zfcp_data.config_lock);
1196 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1197 read_unlock_irq(&zfcp_data.config_lock);
1198 if (port)
1199 return NULL;
1200 }
1201
1202 port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1203 if (!port)
1204 return NULL;
1205
1206 /* initialise reference count stuff */
1207 atomic_set(&port->refcount, 0);
1208 init_waitqueue_head(&port->remove_wq);
1209
1210 INIT_LIST_HEAD(&port->unit_list_head);
1211 INIT_LIST_HEAD(&port->unit_remove_lh);
1212
1213 port->adapter = adapter;
1214
1215 if (check_wwpn)
1216 port->wwpn = wwpn;
1217
1218 atomic_set_mask(status, &port->status);
1219
1220 /* setup for sysfs registration */
1221 if (status & ZFCP_STATUS_PORT_WKA) {
1222 switch (d_id) {
1223 case ZFCP_DID_DIRECTORY_SERVICE:
1224 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1225 "directory");
1226 break;
1227 case ZFCP_DID_MANAGEMENT_SERVICE:
1228 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1229 "management");
1230 break;
1231 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1232 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1233 "key_distribution");
1234 break;
1235 case ZFCP_DID_ALIAS_SERVICE:
1236 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1237 "alias");
1238 break;
1239 case ZFCP_DID_TIME_SERVICE:
1240 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1241 "time");
1242 break;
1243 default:
1244 kfree(port);
1245 return NULL;
1246 }
1247 port->d_id = d_id;
1248 port->sysfs_device.parent = &adapter->generic_services;
1249 } else {
1250 snprintf(port->sysfs_device.bus_id,
1251 BUS_ID_SIZE, "0x%016llx", wwpn);
1252 port->sysfs_device.parent = &adapter->ccw_device->dev;
1253 }
1254 port->sysfs_device.release = zfcp_sysfs_port_release;
1255 dev_set_drvdata(&port->sysfs_device, port);
1256
1257 /* mark port unusable as long as sysfs registration is not complete */
1258 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1259
1260 if (device_register(&port->sysfs_device)) {
1261 kfree(port);
1262 return NULL;
1263 }
1264
1265 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1266 device_unregister(&port->sysfs_device);
1267 return NULL;
1268 }
1269
1270 zfcp_port_get(port);
1271
1272 write_lock_irq(&zfcp_data.config_lock);
1273 list_add_tail(&port->list, &adapter->port_list_head);
1274 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1275 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1276 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1277 if (!adapter->nameserver_port)
1278 adapter->nameserver_port = port;
1279 adapter->ports++;
1280 write_unlock_irq(&zfcp_data.config_lock);
1281
1282 zfcp_adapter_get(adapter);
1283
1284 return port;
1285 }
1286
1287 void
1288 zfcp_port_dequeue(struct zfcp_port *port)
1289 {
1290 zfcp_port_wait(port);
1291 write_lock_irq(&zfcp_data.config_lock);
1292 list_del(&port->list);
1293 port->adapter->ports--;
1294 write_unlock_irq(&zfcp_data.config_lock);
1295 if (port->rport)
1296 fc_remote_port_delete(port->rport);
1297 port->rport = NULL;
1298 zfcp_adapter_put(port->adapter);
1299 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1300 atomic_read(&port->status));
1301 device_unregister(&port->sysfs_device);
1302 }
1303
1304 /* Enqueues a nameserver port */
1305 int
1306 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1307 {
1308 struct zfcp_port *port;
1309
1310 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1311 ZFCP_DID_DIRECTORY_SERVICE);
1312 if (!port) {
1313 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1314 "adapter %s failed\n",
1315 zfcp_get_busid_by_adapter(adapter));
1316 return -ENXIO;
1317 }
1318 zfcp_port_put(port);
1319
1320 return 0;
1321 }
1322
1323 #undef ZFCP_LOG_AREA
1324
1325 /****************************************************************/
1326 /******* Fibre Channel Standard related Functions **************/
1327 /****************************************************************/
1328
1329 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1330
1331 static void
1332 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1333 struct fsf_status_read_buffer *status_buffer)
1334 {
1335 struct fcp_rscn_head *fcp_rscn_head;
1336 struct fcp_rscn_element *fcp_rscn_element;
1337 struct zfcp_port *port;
1338 u16 i;
1339 u16 no_entries;
1340 u32 range_mask;
1341 unsigned long flags;
1342
1343 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1344 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1345
1346 /* see FC-FS */
1347 no_entries = (fcp_rscn_head->payload_len / 4);
1348
1349 for (i = 1; i < no_entries; i++) {
1350 /* skip head and start with 1st element */
1351 fcp_rscn_element++;
1352 switch (fcp_rscn_element->addr_format) {
1353 case ZFCP_PORT_ADDRESS:
1354 range_mask = ZFCP_PORTS_RANGE_PORT;
1355 break;
1356 case ZFCP_AREA_ADDRESS:
1357 range_mask = ZFCP_PORTS_RANGE_AREA;
1358 break;
1359 case ZFCP_DOMAIN_ADDRESS:
1360 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1361 break;
1362 case ZFCP_FABRIC_ADDRESS:
1363 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1364 break;
1365 default:
1366 ZFCP_LOG_INFO("incoming RSCN with unknown "
1367 "address format\n");
1368 continue;
1369 }
1370 read_lock_irqsave(&zfcp_data.config_lock, flags);
1371 list_for_each_entry(port, &adapter->port_list_head, list) {
1372 if (atomic_test_mask
1373 (ZFCP_STATUS_PORT_WKA, &port->status))
1374 continue;
1375 /* Do we know this port? If not skip it. */
1376 if (!atomic_test_mask
1377 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1378 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1379 "port 0x%016Lx\n", port->wwpn);
1380 zfcp_erp_port_reopen(port,
1381 ZFCP_STATUS_COMMON_ERP_FAILED);
1382 continue;
1383 }
1384
1385 /*
1386 * FIXME: race: d_id might being invalidated
1387 * (...DID_DID reset)
1388 */
1389 if ((port->d_id & range_mask)
1390 == (fcp_rscn_element->nport_did & range_mask)) {
1391 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1392 fcp_rscn_element->nport_did);
1393 /*
1394 * Unfortunately, an RSCN does not specify the
1395 * type of change a target underwent. We assume
1396 * that it makes sense to reopen the link.
1397 * FIXME: Shall we try to find out more about
1398 * the target and link state before closing it?
1399 * How to accomplish this? (nameserver?)
1400 * Where would such code be put in?
1401 * (inside or outside erp)
1402 */
1403 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1404 "port 0x%016Lx\n", port->wwpn);
1405 zfcp_test_link(port);
1406 }
1407 }
1408 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1409 }
1410 }
1411
1412 static void
1413 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1414 struct fsf_status_read_buffer *status_buffer)
1415 {
1416 struct fsf_plogi *els_plogi;
1417 struct zfcp_port *port;
1418 unsigned long flags;
1419
1420 els_plogi = (struct fsf_plogi *) status_buffer->payload;
1421 read_lock_irqsave(&zfcp_data.config_lock, flags);
1422 list_for_each_entry(port, &adapter->port_list_head, list) {
1423 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1424 break;
1425 }
1426 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1427
1428 if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1429 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1430 "with d_id 0x%06x on adapter %s\n",
1431 status_buffer->d_id,
1432 zfcp_get_busid_by_adapter(adapter));
1433 } else {
1434 zfcp_erp_port_forced_reopen(port, 0);
1435 }
1436 }
1437
1438 static void
1439 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1440 struct fsf_status_read_buffer *status_buffer)
1441 {
1442 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1443 struct zfcp_port *port;
1444 unsigned long flags;
1445
1446 read_lock_irqsave(&zfcp_data.config_lock, flags);
1447 list_for_each_entry(port, &adapter->port_list_head, list) {
1448 if (port->wwpn == els_logo->nport_wwpn)
1449 break;
1450 }
1451 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1452
1453 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1454 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1455 "with d_id 0x%06x on adapter %s\n",
1456 status_buffer->d_id,
1457 zfcp_get_busid_by_adapter(adapter));
1458 } else {
1459 zfcp_erp_port_forced_reopen(port, 0);
1460 }
1461 }
1462
1463 static void
1464 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1465 struct fsf_status_read_buffer *status_buffer)
1466 {
1467 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1468 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1469 zfcp_get_busid_by_adapter(adapter));
1470
1471 }
1472
1473 void
1474 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1475 {
1476 struct fsf_status_read_buffer *status_buffer;
1477 u32 els_type;
1478 struct zfcp_adapter *adapter;
1479
1480 status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1481 els_type = *(u32 *) (status_buffer->payload);
1482 adapter = fsf_req->adapter;
1483
1484 zfcp_san_dbf_event_incoming_els(fsf_req);
1485 if (els_type == LS_PLOGI)
1486 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1487 else if (els_type == LS_LOGO)
1488 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1489 else if ((els_type & 0xffff0000) == LS_RSCN)
1490 /* we are only concerned with the command, not the length */
1491 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1492 else
1493 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1494 }
1495
1496
1497 /**
1498 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1499 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1500 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1501 */
1502 static int
1503 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1504 {
1505 struct zfcp_gid_pn_data *data;
1506
1507 if (pool != NULL) {
1508 data = mempool_alloc(pool, GFP_ATOMIC);
1509 if (likely(data != NULL)) {
1510 data->ct.pool = pool;
1511 }
1512 } else {
1513 data = kmem_cache_alloc(zfcp_data.gid_pn_cache, GFP_ATOMIC);
1514 }
1515
1516 if (NULL == data)
1517 return -ENOMEM;
1518
1519 memset(data, 0, sizeof(*data));
1520 data->ct.req = &data->req;
1521 data->ct.resp = &data->resp;
1522 data->ct.req_count = data->ct.resp_count = 1;
1523 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1524 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1525 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1526 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1527
1528 *gid_pn = data;
1529 return 0;
1530 }
1531
1532 /**
1533 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1534 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1535 */
1536 static void zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1537 {
1538 if (gid_pn->ct.pool)
1539 mempool_free(gid_pn, gid_pn->ct.pool);
1540 else
1541 kmem_cache_free(zfcp_data.gid_pn_cache, gid_pn);
1542 }
1543
1544 /**
1545 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1546 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1547 */
1548 int
1549 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1550 {
1551 int ret;
1552 struct ct_iu_gid_pn_req *ct_iu_req;
1553 struct zfcp_gid_pn_data *gid_pn;
1554 struct zfcp_adapter *adapter = erp_action->adapter;
1555
1556 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1557 if (ret < 0) {
1558 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1559 "request failed for adapter %s\n",
1560 zfcp_get_busid_by_adapter(adapter));
1561 goto out;
1562 }
1563
1564 /* setup nameserver request */
1565 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1566 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1567 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1568 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1569 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1570 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1571 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1572 ct_iu_req->wwpn = erp_action->port->wwpn;
1573
1574 /* setup parameters for send generic command */
1575 gid_pn->ct.port = adapter->nameserver_port;
1576 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1577 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1578 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1579 gid_pn->port = erp_action->port;
1580
1581 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1582 erp_action);
1583 if (ret) {
1584 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1585 "failed for adapter %s\n",
1586 zfcp_get_busid_by_adapter(adapter));
1587
1588 zfcp_gid_pn_buffers_free(gid_pn);
1589 }
1590
1591 out:
1592 return ret;
1593 }
1594
1595 /**
1596 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1597 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1598 */
1599 static void zfcp_ns_gid_pn_handler(unsigned long data)
1600 {
1601 struct zfcp_port *port;
1602 struct zfcp_send_ct *ct;
1603 struct ct_iu_gid_pn_req *ct_iu_req;
1604 struct ct_iu_gid_pn_resp *ct_iu_resp;
1605 struct zfcp_gid_pn_data *gid_pn;
1606
1607
1608 gid_pn = (struct zfcp_gid_pn_data *) data;
1609 port = gid_pn->port;
1610 ct = &gid_pn->ct;
1611 ct_iu_req = zfcp_sg_to_address(ct->req);
1612 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1613
1614 if (ct->status != 0)
1615 goto failed;
1616
1617 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1618 /* FIXME: do we need some specific erp entry points */
1619 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1620 goto failed;
1621 }
1622 /* paranoia */
1623 if (ct_iu_req->wwpn != port->wwpn) {
1624 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1625 "lookup does not match expected wwpn 0x%016Lx "
1626 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1627 zfcp_get_busid_by_port(port));
1628 goto mismatch;
1629 }
1630
1631 /* looks like a valid d_id */
1632 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1633 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1634 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%06x\n",
1635 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1636 goto out;
1637
1638 mismatch:
1639 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1640 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1641 sizeof(struct ct_iu_gid_pn_req));
1642 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1643 sizeof(struct ct_iu_gid_pn_resp));
1644
1645 failed:
1646 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1647 "0x%016Lx for adapter %s\n",
1648 port->wwpn, zfcp_get_busid_by_port(port));
1649 out:
1650 zfcp_gid_pn_buffers_free(gid_pn);
1651 return;
1652 }
1653
1654 /* reject CT_IU reason codes acc. to FC-GS-4 */
1655 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1656 {0x01, "invalid command code"},
1657 {0x02, "invalid version level"},
1658 {0x03, "logical error"},
1659 {0x04, "invalid CT_IU size"},
1660 {0x05, "logical busy"},
1661 {0x07, "protocol error"},
1662 {0x09, "unable to perform command request"},
1663 {0x0b, "command not supported"},
1664 {0x0d, "server not available"},
1665 {0x0e, "session could not be established"},
1666 {0xff, "vendor specific error"},
1667 {0, NULL},
1668 };
1669
1670 /* LS_RJT reason codes acc. to FC-FS */
1671 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1672 {0x01, "invalid LS_Command code"},
1673 {0x03, "logical error"},
1674 {0x05, "logical busy"},
1675 {0x07, "protocol error"},
1676 {0x09, "unable to perform command request"},
1677 {0x0b, "command not supported"},
1678 {0x0e, "command already in progress"},
1679 {0xff, "vendor specific error"},
1680 {0, NULL},
1681 };
1682
1683 /* reject reason codes according to FC-PH/FC-FS */
1684 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1685 {0x01, "invalid D_ID"},
1686 {0x02, "invalid S_ID"},
1687 {0x03, "Nx_Port not available, temporary"},
1688 {0x04, "Nx_Port not available, permament"},
1689 {0x05, "class not supported"},
1690 {0x06, "delimiter usage error"},
1691 {0x07, "TYPE not supported"},
1692 {0x08, "invalid Link_Control"},
1693 {0x09, "invalid R_CTL field"},
1694 {0x0a, "invalid F_CTL field"},
1695 {0x0b, "invalid OX_ID"},
1696 {0x0c, "invalid RX_ID"},
1697 {0x0d, "invalid SEQ_ID"},
1698 {0x0e, "invalid DF_CTL"},
1699 {0x0f, "invalid SEQ_CNT"},
1700 {0x10, "invalid parameter field"},
1701 {0x11, "exchange error"},
1702 {0x12, "protocol error"},
1703 {0x13, "incorrect length"},
1704 {0x14, "unsupported ACK"},
1705 {0x15, "class of service not supported by entity at FFFFFE"},
1706 {0x16, "login required"},
1707 {0x17, "excessive sequences attempted"},
1708 {0x18, "unable to establish exchange"},
1709 {0x1a, "fabric path not available"},
1710 {0x1b, "invalid VC_ID (class 4)"},
1711 {0x1c, "invalid CS_CTL field"},
1712 {0x1d, "insufficient resources for VC (class 4)"},
1713 {0x1f, "invalid class of service"},
1714 {0x20, "preemption request rejected"},
1715 {0x21, "preemption not enabled"},
1716 {0x22, "multicast error"},
1717 {0x23, "multicast error terminate"},
1718 {0x24, "process login required"},
1719 {0xff, "vendor specific reject"},
1720 {0, NULL},
1721 };
1722
1723 /**
1724 * zfcp_rc_description - return description for given reaon code
1725 * @code: reason code
1726 * @rc_table: table of reason codes and descriptions
1727 */
1728 static const char *
1729 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1730 {
1731 const char *descr = "unknown reason code";
1732
1733 do {
1734 if (code == rc_table->code) {
1735 descr = rc_table->description;
1736 break;
1737 }
1738 rc_table++;
1739 } while (rc_table->code && rc_table->description);
1740
1741 return descr;
1742 }
1743
1744 /**
1745 * zfcp_check_ct_response - evaluate reason code for CT_IU
1746 * @rjt: response payload to an CT_IU request
1747 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1748 */
1749 int
1750 zfcp_check_ct_response(struct ct_hdr *rjt)
1751 {
1752 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1753 return 0;
1754
1755 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1756 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1757 "response code (0x%04hx)\n",
1758 rjt->cmd_rsp_code);
1759 return 1;
1760 }
1761
1762 ZFCP_LOG_INFO("Generic Service command rejected\n");
1763 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1764 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1765 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1766 (u32) rjt->vendor_unique);
1767
1768 return 1;
1769 }
1770
1771 /**
1772 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1773 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1774 * @rc_table: table of reason codes and descriptions
1775 */
1776 static void
1777 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1778 const struct zfcp_rc_entry *rc_table)
1779 {
1780 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1781 zfcp_rc_description(rjt_par->reason_code, rc_table),
1782 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1783 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1784 }
1785
1786 /**
1787 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1788 * @sq: status qualifier word
1789 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1790 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1791 */
1792 int
1793 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1794 {
1795 int ret = -EIO;
1796
1797 if (sq == FSF_IOSTAT_NPORT_RJT) {
1798 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1799 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1800 /* invalid d_id */
1801 if (rjt_par->reason_code == 0x01)
1802 ret = -EREMCHG;
1803 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1804 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1805 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1806 /* invalid d_id */
1807 if (rjt_par->reason_code == 0x01)
1808 ret = -EREMCHG;
1809 } else if (sq == FSF_IOSTAT_LS_RJT) {
1810 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1811 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1812 ret = -EREMOTEIO;
1813 } else
1814 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1815
1816 return ret;
1817 }
1818
1819 /**
1820 * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1821 * into zfcp_port structure
1822 * @port: zfcp_port structure
1823 * @plogi: plogi payload
1824 */
1825 void
1826 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1827 {
1828 port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1829 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1830 if (plogi->serv_param.class1_serv_param[0] & 0x80)
1831 port->supported_classes |= FC_COS_CLASS1;
1832 if (plogi->serv_param.class2_serv_param[0] & 0x80)
1833 port->supported_classes |= FC_COS_CLASS2;
1834 if (plogi->serv_param.class3_serv_param[0] & 0x80)
1835 port->supported_classes |= FC_COS_CLASS3;
1836 if (plogi->serv_param.class4_serv_param[0] & 0x80)
1837 port->supported_classes |= FC_COS_CLASS4;
1838 }
1839
1840 #undef ZFCP_LOG_AREA
Linux kernel - Deliverables
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