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Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/linvil...
[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, 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, 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, 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, *tmp_unit;
819 unsigned int scsi_lun;
820 int found;
821
822 /*
823 * check that there is no unit with this FCP_LUN already in list
824 * and enqueue it.
825 * Note: Unlike for the adapter and the port, this is an error
826 */
827 read_lock_irq(&zfcp_data.config_lock);
828 unit = zfcp_get_unit_by_lun(port, fcp_lun);
829 read_unlock_irq(&zfcp_data.config_lock);
830 if (unit)
831 return NULL;
832
833 unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
834 if (!unit)
835 return NULL;
836
837 /* initialise reference count stuff */
838 atomic_set(&unit->refcount, 0);
839 init_waitqueue_head(&unit->remove_wq);
840
841 unit->port = port;
842 unit->fcp_lun = fcp_lun;
843
844 /* setup for sysfs registration */
845 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
846 unit->sysfs_device.parent = &port->sysfs_device;
847 unit->sysfs_device.release = zfcp_sysfs_unit_release;
848 dev_set_drvdata(&unit->sysfs_device, unit);
849
850 init_waitqueue_head(&unit->scsi_scan_wq);
851
852 /* mark unit unusable as long as sysfs registration is not complete */
853 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
854
855 if (device_register(&unit->sysfs_device)) {
856 kfree(unit);
857 return NULL;
858 }
859
860 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
861 device_unregister(&unit->sysfs_device);
862 return NULL;
863 }
864
865 zfcp_unit_get(unit);
866
867 scsi_lun = 0;
868 found = 0;
869 write_lock_irq(&zfcp_data.config_lock);
870 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
871 if (tmp_unit->scsi_lun != scsi_lun) {
872 found = 1;
873 break;
874 }
875 scsi_lun++;
876 }
877 unit->scsi_lun = scsi_lun;
878 if (found)
879 list_add_tail(&unit->list, &tmp_unit->list);
880 else
881 list_add_tail(&unit->list, &port->unit_list_head);
882 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
883 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
884 write_unlock_irq(&zfcp_data.config_lock);
885
886 port->units++;
887 zfcp_port_get(port);
888
889 return unit;
890 }
891
892 void
893 zfcp_unit_dequeue(struct zfcp_unit *unit)
894 {
895 zfcp_unit_wait(unit);
896 write_lock_irq(&zfcp_data.config_lock);
897 list_del(&unit->list);
898 write_unlock_irq(&zfcp_data.config_lock);
899 unit->port->units--;
900 zfcp_port_put(unit->port);
901 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
902 device_unregister(&unit->sysfs_device);
903 }
904
905 /*
906 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
907 * commands.
908 * It also genrates fcp-nameserver request/response buffer and unsolicited
909 * status read fsf_req buffers.
910 *
911 * locks: must only be called with zfcp_data.config_sema taken
912 */
913 static int
914 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
915 {
916 adapter->pool.fsf_req_erp =
917 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
918 zfcp_data.fsf_req_qtcb_cache);
919 if (!adapter->pool.fsf_req_erp)
920 return -ENOMEM;
921
922 adapter->pool.fsf_req_scsi =
923 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
924 zfcp_data.fsf_req_qtcb_cache);
925 if (!adapter->pool.fsf_req_scsi)
926 return -ENOMEM;
927
928 adapter->pool.fsf_req_abort =
929 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
930 zfcp_data.fsf_req_qtcb_cache);
931 if (!adapter->pool.fsf_req_abort)
932 return -ENOMEM;
933
934 adapter->pool.fsf_req_status_read =
935 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
936 sizeof(struct zfcp_fsf_req));
937 if (!adapter->pool.fsf_req_status_read)
938 return -ENOMEM;
939
940 adapter->pool.data_status_read =
941 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
942 zfcp_data.sr_buffer_cache);
943 if (!adapter->pool.data_status_read)
944 return -ENOMEM;
945
946 adapter->pool.data_gid_pn =
947 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
948 zfcp_data.gid_pn_cache);
949 if (!adapter->pool.data_gid_pn)
950 return -ENOMEM;
951
952 return 0;
953 }
954
955 /**
956 * zfcp_free_low_mem_buffers - free memory pools of an adapter
957 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
958 * locking: zfcp_data.config_sema must be held
959 */
960 static void
961 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
962 {
963 if (adapter->pool.fsf_req_erp)
964 mempool_destroy(adapter->pool.fsf_req_erp);
965 if (adapter->pool.fsf_req_scsi)
966 mempool_destroy(adapter->pool.fsf_req_scsi);
967 if (adapter->pool.fsf_req_abort)
968 mempool_destroy(adapter->pool.fsf_req_abort);
969 if (adapter->pool.fsf_req_status_read)
970 mempool_destroy(adapter->pool.fsf_req_status_read);
971 if (adapter->pool.data_status_read)
972 mempool_destroy(adapter->pool.data_status_read);
973 if (adapter->pool.data_gid_pn)
974 mempool_destroy(adapter->pool.data_gid_pn);
975 }
976
977 static void zfcp_dummy_release(struct device *dev)
978 {
979 return;
980 }
981
982 /*
983 * Enqueues an adapter at the end of the adapter list in the driver data.
984 * All adapter internal structures are set up.
985 * Proc-fs entries are also created.
986 *
987 * returns: 0 if a new adapter was successfully enqueued
988 * ZFCP_KNOWN if an adapter with this devno was already present
989 * -ENOMEM if alloc failed
990 * locks: config_sema must be held to serialise changes to the adapter list
991 */
992 struct zfcp_adapter *
993 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
994 {
995 int retval = 0;
996 struct zfcp_adapter *adapter;
997
998 /*
999 * Note: It is safe to release the list_lock, as any list changes
1000 * are protected by the config_sema, which must be held to get here
1001 */
1002
1003 /* try to allocate new adapter data structure (zeroed) */
1004 adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1005 if (!adapter) {
1006 ZFCP_LOG_INFO("error: allocation of base adapter "
1007 "structure failed\n");
1008 goto out;
1009 }
1010
1011 ccw_device->handler = NULL;
1012
1013 /* save ccw_device pointer */
1014 adapter->ccw_device = ccw_device;
1015
1016 retval = zfcp_qdio_allocate_queues(adapter);
1017 if (retval)
1018 goto queues_alloc_failed;
1019
1020 retval = zfcp_qdio_allocate(adapter);
1021 if (retval)
1022 goto qdio_allocate_failed;
1023
1024 retval = zfcp_allocate_low_mem_buffers(adapter);
1025 if (retval) {
1026 ZFCP_LOG_INFO("error: pool allocation failed\n");
1027 goto failed_low_mem_buffers;
1028 }
1029
1030 /* initialise reference count stuff */
1031 atomic_set(&adapter->refcount, 0);
1032 init_waitqueue_head(&adapter->remove_wq);
1033
1034 /* initialise list of ports */
1035 INIT_LIST_HEAD(&adapter->port_list_head);
1036
1037 /* initialise list of ports to be removed */
1038 INIT_LIST_HEAD(&adapter->port_remove_lh);
1039
1040 /* initialize list of fsf requests */
1041 spin_lock_init(&adapter->req_list_lock);
1042 retval = zfcp_reqlist_alloc(adapter);
1043 if (retval) {
1044 ZFCP_LOG_INFO("request list initialization failed\n");
1045 goto failed_low_mem_buffers;
1046 }
1047
1048 /* initialize debug locks */
1049
1050 spin_lock_init(&adapter->erp_dbf_lock);
1051 spin_lock_init(&adapter->hba_dbf_lock);
1052 spin_lock_init(&adapter->san_dbf_lock);
1053 spin_lock_init(&adapter->scsi_dbf_lock);
1054
1055 /* initialize error recovery stuff */
1056
1057 rwlock_init(&adapter->erp_lock);
1058 sema_init(&adapter->erp_ready_sem, 0);
1059 INIT_LIST_HEAD(&adapter->erp_ready_head);
1060 INIT_LIST_HEAD(&adapter->erp_running_head);
1061
1062 /* initialize abort lock */
1063 rwlock_init(&adapter->abort_lock);
1064
1065 /* initialise some erp stuff */
1066 init_waitqueue_head(&adapter->erp_thread_wqh);
1067 init_waitqueue_head(&adapter->erp_done_wqh);
1068
1069 /* initialize lock of associated request queue */
1070 rwlock_init(&adapter->request_queue.queue_lock);
1071
1072 /* mark adapter unusable as long as sysfs registration is not complete */
1073 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1074
1075 adapter->ccw_device = ccw_device;
1076 dev_set_drvdata(&ccw_device->dev, adapter);
1077
1078 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1079 goto sysfs_failed;
1080
1081 adapter->generic_services.parent = &adapter->ccw_device->dev;
1082 adapter->generic_services.release = zfcp_dummy_release;
1083 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1084 "generic_services");
1085
1086 if (device_register(&adapter->generic_services))
1087 goto generic_services_failed;
1088
1089 /* put allocated adapter at list tail */
1090 write_lock_irq(&zfcp_data.config_lock);
1091 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1092 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1093 write_unlock_irq(&zfcp_data.config_lock);
1094
1095 zfcp_data.adapters++;
1096
1097 goto out;
1098
1099 generic_services_failed:
1100 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1101 sysfs_failed:
1102 dev_set_drvdata(&ccw_device->dev, NULL);
1103 zfcp_reqlist_free(adapter);
1104 failed_low_mem_buffers:
1105 zfcp_free_low_mem_buffers(adapter);
1106 if (qdio_free(ccw_device) != 0)
1107 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1108 zfcp_get_busid_by_adapter(adapter));
1109 qdio_allocate_failed:
1110 zfcp_qdio_free_queues(adapter);
1111 queues_alloc_failed:
1112 kfree(adapter);
1113 adapter = NULL;
1114 out:
1115 return adapter;
1116 }
1117
1118 /*
1119 * returns: 0 - struct zfcp_adapter data structure successfully removed
1120 * !0 - struct zfcp_adapter data structure could not be removed
1121 * (e.g. still used)
1122 * locks: adapter list write lock is assumed to be held by caller
1123 */
1124 void
1125 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1126 {
1127 int retval = 0;
1128 unsigned long flags;
1129
1130 zfcp_adapter_scsi_unregister(adapter);
1131 device_unregister(&adapter->generic_services);
1132 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1133 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1134 /* sanity check: no pending FSF requests */
1135 spin_lock_irqsave(&adapter->req_list_lock, flags);
1136 retval = zfcp_reqlist_isempty(adapter);
1137 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1138 if (!retval) {
1139 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1140 "%i requests outstanding\n",
1141 zfcp_get_busid_by_adapter(adapter), adapter,
1142 atomic_read(&adapter->reqs_active));
1143 retval = -EBUSY;
1144 goto out;
1145 }
1146
1147 /* remove specified adapter data structure from list */
1148 write_lock_irq(&zfcp_data.config_lock);
1149 list_del(&adapter->list);
1150 write_unlock_irq(&zfcp_data.config_lock);
1151
1152 /* decrease number of adapters in list */
1153 zfcp_data.adapters--;
1154
1155 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1156 "%i adapters still in list\n",
1157 zfcp_get_busid_by_adapter(adapter),
1158 adapter, zfcp_data.adapters);
1159
1160 retval = qdio_free(adapter->ccw_device);
1161 if (retval)
1162 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1163 zfcp_get_busid_by_adapter(adapter));
1164
1165 zfcp_free_low_mem_buffers(adapter);
1166 /* free memory of adapter data structure and queues */
1167 zfcp_qdio_free_queues(adapter);
1168 zfcp_reqlist_free(adapter);
1169 kfree(adapter->fc_stats);
1170 kfree(adapter->stats_reset_data);
1171 ZFCP_LOG_TRACE("freeing adapter structure\n");
1172 kfree(adapter);
1173 out:
1174 return;
1175 }
1176
1177 /**
1178 * zfcp_port_enqueue - enqueue port to port list of adapter
1179 * @adapter: adapter where remote port is added
1180 * @wwpn: WWPN of the remote port to be enqueued
1181 * @status: initial status for the port
1182 * @d_id: destination id of the remote port to be enqueued
1183 * Return: pointer to enqueued port on success, NULL on error
1184 * Locks: config_sema must be held to serialize changes to the port list
1185 *
1186 * All port internal structures are set up and the sysfs entry is generated.
1187 * d_id is used to enqueue ports with a well known address like the Directory
1188 * Service for nameserver lookup.
1189 */
1190 struct zfcp_port *
1191 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1192 u32 d_id)
1193 {
1194 struct zfcp_port *port;
1195 int check_wwpn;
1196
1197 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1198 /*
1199 * check that there is no port with this WWPN already in list
1200 */
1201 if (check_wwpn) {
1202 read_lock_irq(&zfcp_data.config_lock);
1203 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1204 read_unlock_irq(&zfcp_data.config_lock);
1205 if (port)
1206 return NULL;
1207 }
1208
1209 port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1210 if (!port)
1211 return NULL;
1212
1213 /* initialise reference count stuff */
1214 atomic_set(&port->refcount, 0);
1215 init_waitqueue_head(&port->remove_wq);
1216
1217 INIT_LIST_HEAD(&port->unit_list_head);
1218 INIT_LIST_HEAD(&port->unit_remove_lh);
1219
1220 port->adapter = adapter;
1221
1222 if (check_wwpn)
1223 port->wwpn = wwpn;
1224
1225 atomic_set_mask(status, &port->status);
1226
1227 /* setup for sysfs registration */
1228 if (status & ZFCP_STATUS_PORT_WKA) {
1229 switch (d_id) {
1230 case ZFCP_DID_DIRECTORY_SERVICE:
1231 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1232 "directory");
1233 break;
1234 case ZFCP_DID_MANAGEMENT_SERVICE:
1235 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1236 "management");
1237 break;
1238 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1239 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1240 "key_distribution");
1241 break;
1242 case ZFCP_DID_ALIAS_SERVICE:
1243 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1244 "alias");
1245 break;
1246 case ZFCP_DID_TIME_SERVICE:
1247 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1248 "time");
1249 break;
1250 default:
1251 kfree(port);
1252 return NULL;
1253 }
1254 port->d_id = d_id;
1255 port->sysfs_device.parent = &adapter->generic_services;
1256 } else {
1257 snprintf(port->sysfs_device.bus_id,
1258 BUS_ID_SIZE, "0x%016llx", wwpn);
1259 port->sysfs_device.parent = &adapter->ccw_device->dev;
1260 }
1261 port->sysfs_device.release = zfcp_sysfs_port_release;
1262 dev_set_drvdata(&port->sysfs_device, port);
1263
1264 /* mark port unusable as long as sysfs registration is not complete */
1265 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1266
1267 if (device_register(&port->sysfs_device)) {
1268 kfree(port);
1269 return NULL;
1270 }
1271
1272 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1273 device_unregister(&port->sysfs_device);
1274 return NULL;
1275 }
1276
1277 zfcp_port_get(port);
1278
1279 write_lock_irq(&zfcp_data.config_lock);
1280 list_add_tail(&port->list, &adapter->port_list_head);
1281 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1282 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1283 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1284 if (!adapter->nameserver_port)
1285 adapter->nameserver_port = port;
1286 adapter->ports++;
1287 write_unlock_irq(&zfcp_data.config_lock);
1288
1289 zfcp_adapter_get(adapter);
1290
1291 return port;
1292 }
1293
1294 void
1295 zfcp_port_dequeue(struct zfcp_port *port)
1296 {
1297 zfcp_port_wait(port);
1298 write_lock_irq(&zfcp_data.config_lock);
1299 list_del(&port->list);
1300 port->adapter->ports--;
1301 write_unlock_irq(&zfcp_data.config_lock);
1302 if (port->rport)
1303 fc_remote_port_delete(port->rport);
1304 port->rport = NULL;
1305 zfcp_adapter_put(port->adapter);
1306 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1307 atomic_read(&port->status));
1308 device_unregister(&port->sysfs_device);
1309 }
1310
1311 /* Enqueues a nameserver port */
1312 int
1313 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1314 {
1315 struct zfcp_port *port;
1316
1317 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1318 ZFCP_DID_DIRECTORY_SERVICE);
1319 if (!port) {
1320 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1321 "adapter %s failed\n",
1322 zfcp_get_busid_by_adapter(adapter));
1323 return -ENXIO;
1324 }
1325 zfcp_port_put(port);
1326
1327 return 0;
1328 }
1329
1330 #undef ZFCP_LOG_AREA
1331
1332 /****************************************************************/
1333 /******* Fibre Channel Standard related Functions **************/
1334 /****************************************************************/
1335
1336 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1337
1338 static void
1339 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1340 struct fsf_status_read_buffer *status_buffer)
1341 {
1342 struct fcp_rscn_head *fcp_rscn_head;
1343 struct fcp_rscn_element *fcp_rscn_element;
1344 struct zfcp_port *port;
1345 u16 i;
1346 u16 no_entries;
1347 u32 range_mask;
1348 unsigned long flags;
1349
1350 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1351 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1352
1353 /* see FC-FS */
1354 no_entries = (fcp_rscn_head->payload_len / 4);
1355
1356 for (i = 1; i < no_entries; i++) {
1357 /* skip head and start with 1st element */
1358 fcp_rscn_element++;
1359 switch (fcp_rscn_element->addr_format) {
1360 case ZFCP_PORT_ADDRESS:
1361 range_mask = ZFCP_PORTS_RANGE_PORT;
1362 break;
1363 case ZFCP_AREA_ADDRESS:
1364 range_mask = ZFCP_PORTS_RANGE_AREA;
1365 break;
1366 case ZFCP_DOMAIN_ADDRESS:
1367 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1368 break;
1369 case ZFCP_FABRIC_ADDRESS:
1370 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1371 break;
1372 default:
1373 ZFCP_LOG_INFO("incoming RSCN with unknown "
1374 "address format\n");
1375 continue;
1376 }
1377 read_lock_irqsave(&zfcp_data.config_lock, flags);
1378 list_for_each_entry(port, &adapter->port_list_head, list) {
1379 if (atomic_test_mask
1380 (ZFCP_STATUS_PORT_WKA, &port->status))
1381 continue;
1382 /* Do we know this port? If not skip it. */
1383 if (!atomic_test_mask
1384 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1385 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1386 "port 0x%016Lx\n", port->wwpn);
1387 zfcp_erp_port_reopen(port,
1388 ZFCP_STATUS_COMMON_ERP_FAILED);
1389 continue;
1390 }
1391
1392 /*
1393 * FIXME: race: d_id might being invalidated
1394 * (...DID_DID reset)
1395 */
1396 if ((port->d_id & range_mask)
1397 == (fcp_rscn_element->nport_did & range_mask)) {
1398 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1399 fcp_rscn_element->nport_did);
1400 /*
1401 * Unfortunately, an RSCN does not specify the
1402 * type of change a target underwent. We assume
1403 * that it makes sense to reopen the link.
1404 * FIXME: Shall we try to find out more about
1405 * the target and link state before closing it?
1406 * How to accomplish this? (nameserver?)
1407 * Where would such code be put in?
1408 * (inside or outside erp)
1409 */
1410 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1411 "port 0x%016Lx\n", port->wwpn);
1412 zfcp_test_link(port);
1413 }
1414 }
1415 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1416 }
1417 }
1418
1419 static void
1420 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1421 struct fsf_status_read_buffer *status_buffer)
1422 {
1423 struct fsf_plogi *els_plogi;
1424 struct zfcp_port *port;
1425 unsigned long flags;
1426
1427 els_plogi = (struct fsf_plogi *) status_buffer->payload;
1428 read_lock_irqsave(&zfcp_data.config_lock, flags);
1429 list_for_each_entry(port, &adapter->port_list_head, list) {
1430 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1431 break;
1432 }
1433 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1434
1435 if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1436 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1437 "with d_id 0x%06x on adapter %s\n",
1438 status_buffer->d_id,
1439 zfcp_get_busid_by_adapter(adapter));
1440 } else {
1441 zfcp_erp_port_forced_reopen(port, 0);
1442 }
1443 }
1444
1445 static void
1446 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1447 struct fsf_status_read_buffer *status_buffer)
1448 {
1449 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1450 struct zfcp_port *port;
1451 unsigned long flags;
1452
1453 read_lock_irqsave(&zfcp_data.config_lock, flags);
1454 list_for_each_entry(port, &adapter->port_list_head, list) {
1455 if (port->wwpn == els_logo->nport_wwpn)
1456 break;
1457 }
1458 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1459
1460 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1461 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1462 "with d_id 0x%06x on adapter %s\n",
1463 status_buffer->d_id,
1464 zfcp_get_busid_by_adapter(adapter));
1465 } else {
1466 zfcp_erp_port_forced_reopen(port, 0);
1467 }
1468 }
1469
1470 static void
1471 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1472 struct fsf_status_read_buffer *status_buffer)
1473 {
1474 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1475 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1476 zfcp_get_busid_by_adapter(adapter));
1477
1478 }
1479
1480 void
1481 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1482 {
1483 struct fsf_status_read_buffer *status_buffer;
1484 u32 els_type;
1485 struct zfcp_adapter *adapter;
1486
1487 status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1488 els_type = *(u32 *) (status_buffer->payload);
1489 adapter = fsf_req->adapter;
1490
1491 zfcp_san_dbf_event_incoming_els(fsf_req);
1492 if (els_type == LS_PLOGI)
1493 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1494 else if (els_type == LS_LOGO)
1495 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1496 else if ((els_type & 0xffff0000) == LS_RSCN)
1497 /* we are only concerned with the command, not the length */
1498 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1499 else
1500 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1501 }
1502
1503
1504 /**
1505 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1506 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1507 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1508 */
1509 static int
1510 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1511 {
1512 struct zfcp_gid_pn_data *data;
1513
1514 if (pool != NULL) {
1515 data = mempool_alloc(pool, GFP_ATOMIC);
1516 if (likely(data != NULL)) {
1517 data->ct.pool = pool;
1518 }
1519 } else {
1520 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1521 }
1522
1523 if (NULL == data)
1524 return -ENOMEM;
1525
1526 memset(data, 0, sizeof(*data));
1527 data->ct.req = &data->req;
1528 data->ct.resp = &data->resp;
1529 data->ct.req_count = data->ct.resp_count = 1;
1530 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1531 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1532 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1533 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1534
1535 *gid_pn = data;
1536 return 0;
1537 }
1538
1539 /**
1540 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1541 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1542 */
1543 static void
1544 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1545 {
1546 if ((gid_pn->ct.pool != 0))
1547 mempool_free(gid_pn, gid_pn->ct.pool);
1548 else
1549 kfree(gid_pn);
1550
1551 return;
1552 }
1553
1554 /**
1555 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1556 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1557 */
1558 int
1559 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1560 {
1561 int ret;
1562 struct ct_iu_gid_pn_req *ct_iu_req;
1563 struct zfcp_gid_pn_data *gid_pn;
1564 struct zfcp_adapter *adapter = erp_action->adapter;
1565
1566 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1567 if (ret < 0) {
1568 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1569 "request failed for adapter %s\n",
1570 zfcp_get_busid_by_adapter(adapter));
1571 goto out;
1572 }
1573
1574 /* setup nameserver request */
1575 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1576 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1577 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1578 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1579 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1580 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1581 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1582 ct_iu_req->wwpn = erp_action->port->wwpn;
1583
1584 /* setup parameters for send generic command */
1585 gid_pn->ct.port = adapter->nameserver_port;
1586 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1587 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1588 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1589 gid_pn->port = erp_action->port;
1590
1591 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1592 erp_action);
1593 if (ret) {
1594 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1595 "failed for adapter %s\n",
1596 zfcp_get_busid_by_adapter(adapter));
1597
1598 zfcp_gid_pn_buffers_free(gid_pn);
1599 }
1600
1601 out:
1602 return ret;
1603 }
1604
1605 /**
1606 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1607 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1608 */
1609 static void zfcp_ns_gid_pn_handler(unsigned long data)
1610 {
1611 struct zfcp_port *port;
1612 struct zfcp_send_ct *ct;
1613 struct ct_iu_gid_pn_req *ct_iu_req;
1614 struct ct_iu_gid_pn_resp *ct_iu_resp;
1615 struct zfcp_gid_pn_data *gid_pn;
1616
1617
1618 gid_pn = (struct zfcp_gid_pn_data *) data;
1619 port = gid_pn->port;
1620 ct = &gid_pn->ct;
1621 ct_iu_req = zfcp_sg_to_address(ct->req);
1622 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1623
1624 if (ct->status != 0)
1625 goto failed;
1626
1627 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1628 /* FIXME: do we need some specific erp entry points */
1629 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1630 goto failed;
1631 }
1632 /* paranoia */
1633 if (ct_iu_req->wwpn != port->wwpn) {
1634 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1635 "lookup does not match expected wwpn 0x%016Lx "
1636 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1637 zfcp_get_busid_by_port(port));
1638 goto mismatch;
1639 }
1640
1641 /* looks like a valid d_id */
1642 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1643 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1644 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%06x\n",
1645 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1646 goto out;
1647
1648 mismatch:
1649 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1650 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1651 sizeof(struct ct_iu_gid_pn_req));
1652 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1653 sizeof(struct ct_iu_gid_pn_resp));
1654
1655 failed:
1656 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1657 "0x%016Lx for adapter %s\n",
1658 port->wwpn, zfcp_get_busid_by_port(port));
1659 out:
1660 zfcp_gid_pn_buffers_free(gid_pn);
1661 return;
1662 }
1663
1664 /* reject CT_IU reason codes acc. to FC-GS-4 */
1665 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1666 {0x01, "invalid command code"},
1667 {0x02, "invalid version level"},
1668 {0x03, "logical error"},
1669 {0x04, "invalid CT_IU size"},
1670 {0x05, "logical busy"},
1671 {0x07, "protocol error"},
1672 {0x09, "unable to perform command request"},
1673 {0x0b, "command not supported"},
1674 {0x0d, "server not available"},
1675 {0x0e, "session could not be established"},
1676 {0xff, "vendor specific error"},
1677 {0, NULL},
1678 };
1679
1680 /* LS_RJT reason codes acc. to FC-FS */
1681 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1682 {0x01, "invalid LS_Command code"},
1683 {0x03, "logical error"},
1684 {0x05, "logical busy"},
1685 {0x07, "protocol error"},
1686 {0x09, "unable to perform command request"},
1687 {0x0b, "command not supported"},
1688 {0x0e, "command already in progress"},
1689 {0xff, "vendor specific error"},
1690 {0, NULL},
1691 };
1692
1693 /* reject reason codes according to FC-PH/FC-FS */
1694 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1695 {0x01, "invalid D_ID"},
1696 {0x02, "invalid S_ID"},
1697 {0x03, "Nx_Port not available, temporary"},
1698 {0x04, "Nx_Port not available, permament"},
1699 {0x05, "class not supported"},
1700 {0x06, "delimiter usage error"},
1701 {0x07, "TYPE not supported"},
1702 {0x08, "invalid Link_Control"},
1703 {0x09, "invalid R_CTL field"},
1704 {0x0a, "invalid F_CTL field"},
1705 {0x0b, "invalid OX_ID"},
1706 {0x0c, "invalid RX_ID"},
1707 {0x0d, "invalid SEQ_ID"},
1708 {0x0e, "invalid DF_CTL"},
1709 {0x0f, "invalid SEQ_CNT"},
1710 {0x10, "invalid parameter field"},
1711 {0x11, "exchange error"},
1712 {0x12, "protocol error"},
1713 {0x13, "incorrect length"},
1714 {0x14, "unsupported ACK"},
1715 {0x15, "class of service not supported by entity at FFFFFE"},
1716 {0x16, "login required"},
1717 {0x17, "excessive sequences attempted"},
1718 {0x18, "unable to establish exchange"},
1719 {0x1a, "fabric path not available"},
1720 {0x1b, "invalid VC_ID (class 4)"},
1721 {0x1c, "invalid CS_CTL field"},
1722 {0x1d, "insufficient resources for VC (class 4)"},
1723 {0x1f, "invalid class of service"},
1724 {0x20, "preemption request rejected"},
1725 {0x21, "preemption not enabled"},
1726 {0x22, "multicast error"},
1727 {0x23, "multicast error terminate"},
1728 {0x24, "process login required"},
1729 {0xff, "vendor specific reject"},
1730 {0, NULL},
1731 };
1732
1733 /**
1734 * zfcp_rc_description - return description for given reaon code
1735 * @code: reason code
1736 * @rc_table: table of reason codes and descriptions
1737 */
1738 static const char *
1739 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1740 {
1741 const char *descr = "unknown reason code";
1742
1743 do {
1744 if (code == rc_table->code) {
1745 descr = rc_table->description;
1746 break;
1747 }
1748 rc_table++;
1749 } while (rc_table->code && rc_table->description);
1750
1751 return descr;
1752 }
1753
1754 /**
1755 * zfcp_check_ct_response - evaluate reason code for CT_IU
1756 * @rjt: response payload to an CT_IU request
1757 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1758 */
1759 int
1760 zfcp_check_ct_response(struct ct_hdr *rjt)
1761 {
1762 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1763 return 0;
1764
1765 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1766 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1767 "response code (0x%04hx)\n",
1768 rjt->cmd_rsp_code);
1769 return 1;
1770 }
1771
1772 ZFCP_LOG_INFO("Generic Service command rejected\n");
1773 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1774 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1775 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1776 (u32) rjt->vendor_unique);
1777
1778 return 1;
1779 }
1780
1781 /**
1782 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1783 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1784 * @rc_table: table of reason codes and descriptions
1785 */
1786 static void
1787 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1788 const struct zfcp_rc_entry *rc_table)
1789 {
1790 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1791 zfcp_rc_description(rjt_par->reason_code, rc_table),
1792 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1793 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1794 }
1795
1796 /**
1797 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1798 * @sq: status qualifier word
1799 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1800 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1801 */
1802 int
1803 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1804 {
1805 int ret = -EIO;
1806
1807 if (sq == FSF_IOSTAT_NPORT_RJT) {
1808 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1809 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1810 /* invalid d_id */
1811 if (rjt_par->reason_code == 0x01)
1812 ret = -EREMCHG;
1813 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1814 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1815 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1816 /* invalid d_id */
1817 if (rjt_par->reason_code == 0x01)
1818 ret = -EREMCHG;
1819 } else if (sq == FSF_IOSTAT_LS_RJT) {
1820 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1821 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1822 ret = -EREMOTEIO;
1823 } else
1824 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1825
1826 return ret;
1827 }
1828
1829 /**
1830 * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1831 * into zfcp_port structure
1832 * @port: zfcp_port structure
1833 * @plogi: plogi payload
1834 */
1835 void
1836 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1837 {
1838 port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1839 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1840 if (plogi->serv_param.class1_serv_param[0] & 0x80)
1841 port->supported_classes |= FC_COS_CLASS1;
1842 if (plogi->serv_param.class2_serv_param[0] & 0x80)
1843 port->supported_classes |= FC_COS_CLASS2;
1844 if (plogi->serv_param.class3_serv_param[0] & 0x80)
1845 port->supported_classes |= FC_COS_CLASS3;
1846 if (plogi->serv_param.class4_serv_param[0] & 0x80)
1847 port->supported_classes |= FC_COS_CLASS4;
1848 }
1849
1850 #undef ZFCP_LOG_AREA
Linux kernel - Deliverables
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