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