projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[PATCH] gfp flags annotations - part 1
[deliverable/linux.git] / drivers / s390 / scsi / zfcp_aux.c
1 /*
2 *
3 * linux/drivers/s390/scsi/zfcp_aux.c
4 *
5 * FCP adapter driver for IBM eServer zSeries
6 *
7 * (C) Copyright IBM Corp. 2002, 2004
8 *
9 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
10 * Raimund Schroeder <raimund.schroeder@de.ibm.com>
11 * Aron Zeh
12 * Wolfgang Taphorn
13 * Stefan Bader <stefan.bader@de.ibm.com>
14 * Heiko Carstens <heiko.carstens@de.ibm.com>
15 * Andreas Herrmann <aherrman@de.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2, or (at your option)
20 * any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32 #define ZFCP_AUX_REVISION "$Revision: 1.145 $"
33
34 #include "zfcp_ext.h"
35
36 /* accumulated log level (module parameter) */
37 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
38 static char *device;
39 /*********************** FUNCTION PROTOTYPES *********************************/
40
41 /* written against the module interface */
42 static int __init zfcp_module_init(void);
43
44 /* FCP related */
45 static void zfcp_ns_gid_pn_handler(unsigned long);
46
47 /* miscellaneous */
48 static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
49 static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
50 static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
51 void __user *, size_t);
52 static inline int zfcp_sg_list_copy_to_user(void __user *,
53 struct zfcp_sg_list *, size_t);
54
55 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
56
57 #define ZFCP_CFDC_IOC_MAGIC 0xDD
58 #define ZFCP_CFDC_IOC \
59 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
60
61
62 static struct file_operations zfcp_cfdc_fops = {
63 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
64 #ifdef CONFIG_COMPAT
65 .compat_ioctl = zfcp_cfdc_dev_ioctl
66 #endif
67 };
68
69 static struct miscdevice zfcp_cfdc_misc = {
70 .minor = ZFCP_CFDC_DEV_MINOR,
71 .name = ZFCP_CFDC_DEV_NAME,
72 .fops = &zfcp_cfdc_fops
73 };
74
75 /*********************** KERNEL/MODULE PARAMETERS ***************************/
76
77 /* declare driver module init/cleanup functions */
78 module_init(zfcp_module_init);
79
80 MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
81 "Andreas Herrman <aherrman@de.ibm.com>, "
82 "Martin Peschke <mpeschke@de.ibm.com>, "
83 "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
84 "Wolfgang Taphorn <taphorn@de.ibm.com>, "
85 "Aron Zeh <arzeh@de.ibm.com>, "
86 "IBM Deutschland Entwicklung GmbH");
87 MODULE_DESCRIPTION
88 ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
89 MODULE_LICENSE("GPL");
90
91 module_param(device, charp, 0400);
92 MODULE_PARM_DESC(device, "specify initial device");
93
94 module_param(loglevel, uint, 0400);
95 MODULE_PARM_DESC(loglevel,
96 "log levels, 8 nibbles: "
97 "FC ERP QDIO CIO Config FSF SCSI Other, "
98 "levels: 0=none 1=normal 2=devel 3=trace");
99
100 /****************************************************************/
101 /************** Functions without logging ***********************/
102 /****************************************************************/
103
104 void
105 _zfcp_hex_dump(char *addr, int count)
106 {
107 int i;
108 for (i = 0; i < count; i++) {
109 printk("%02x", addr[i]);
110 if ((i % 4) == 3)
111 printk(" ");
112 if ((i % 32) == 31)
113 printk("\n");
114 }
115 if (((i-1) % 32) != 31)
116 printk("\n");
117 }
118
119 /****************************************************************/
120 /************** Uncategorised Functions *************************/
121 /****************************************************************/
122
123 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
124
125 /**
126 * zfcp_device_setup - setup function
127 * @str: pointer to parameter string
128 *
129 * Parse "device=..." parameter string.
130 */
131 static int __init
132 zfcp_device_setup(char *devstr)
133 {
134 char *tmp, *str;
135 size_t len;
136
137 if (!devstr)
138 return 0;
139
140 len = strlen(devstr) + 1;
141 str = (char *) kmalloc(len, GFP_KERNEL);
142 if (!str)
143 goto err_out;
144 memcpy(str, devstr, len);
145
146 tmp = strchr(str, ',');
147 if (!tmp)
148 goto err_out;
149 *tmp++ = '\0';
150 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
151 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
152
153 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
154 if (*tmp++ != ',')
155 goto err_out;
156 if (*tmp == '\0')
157 goto err_out;
158
159 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
160 if (*tmp != '\0')
161 goto err_out;
162 kfree(str);
163 return 1;
164
165 err_out:
166 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
167 kfree(str);
168 return 0;
169 }
170
171 static void __init
172 zfcp_init_device_configure(void)
173 {
174 struct zfcp_adapter *adapter;
175 struct zfcp_port *port;
176 struct zfcp_unit *unit;
177
178 down(&zfcp_data.config_sema);
179 read_lock_irq(&zfcp_data.config_lock);
180 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
181 if (adapter)
182 zfcp_adapter_get(adapter);
183 read_unlock_irq(&zfcp_data.config_lock);
184
185 if (adapter == NULL)
186 goto out_adapter;
187 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
188 if (!port)
189 goto out_port;
190 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
191 if (!unit)
192 goto out_unit;
193 up(&zfcp_data.config_sema);
194 ccw_device_set_online(adapter->ccw_device);
195 zfcp_erp_wait(adapter);
196 down(&zfcp_data.config_sema);
197 zfcp_unit_put(unit);
198 out_unit:
199 zfcp_port_put(port);
200 out_port:
201 zfcp_adapter_put(adapter);
202 out_adapter:
203 up(&zfcp_data.config_sema);
204 return;
205 }
206
207 static int __init
208 zfcp_module_init(void)
209 {
210
211 int retval = 0;
212
213 atomic_set(&zfcp_data.loglevel, loglevel);
214
215 /* initialize adapter list */
216 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
217
218 /* initialize adapters to be removed list head */
219 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
220
221 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
222 if (!zfcp_transport_template)
223 return -ENODEV;
224
225 retval = misc_register(&zfcp_cfdc_misc);
226 if (retval != 0) {
227 ZFCP_LOG_INFO("registration of misc device "
228 "zfcp_cfdc failed\n");
229 goto out;
230 }
231
232 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
233 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
234
235 /* Initialise proc semaphores */
236 sema_init(&zfcp_data.config_sema, 1);
237
238 /* initialise configuration rw lock */
239 rwlock_init(&zfcp_data.config_lock);
240
241 /* save address of data structure managing the driver module */
242 zfcp_data.scsi_host_template.module = THIS_MODULE;
243
244 /* setup dynamic I/O */
245 retval = zfcp_ccw_register();
246 if (retval) {
247 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
248 goto out_ccw_register;
249 }
250
251 if (zfcp_device_setup(device))
252 zfcp_init_device_configure();
253
254 goto out;
255
256 out_ccw_register:
257 misc_deregister(&zfcp_cfdc_misc);
258 out:
259 return retval;
260 }
261
262 /*
263 * function: zfcp_cfdc_dev_ioctl
264 *
265 * purpose: Handle control file upload/download transaction via IOCTL
266 * interface
267 *
268 * returns: 0 - Operation completed successfuly
269 * -ENOTTY - Unknown IOCTL command
270 * -EINVAL - Invalid sense data record
271 * -ENXIO - The FCP adapter is not available
272 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
273 * -ENOMEM - Insufficient memory
274 * -EFAULT - User space memory I/O operation fault
275 * -EPERM - Cannot create or queue FSF request or create SBALs
276 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
277 */
278 static long
279 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
280 unsigned long buffer)
281 {
282 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
283 struct zfcp_adapter *adapter = NULL;
284 struct zfcp_fsf_req *fsf_req = NULL;
285 struct zfcp_sg_list *sg_list = NULL;
286 u32 fsf_command, option;
287 char *bus_id = NULL;
288 int retval = 0;
289
290 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
291 if (sense_data == NULL) {
292 retval = -ENOMEM;
293 goto out;
294 }
295
296 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
297 if (sg_list == NULL) {
298 retval = -ENOMEM;
299 goto out;
300 }
301 memset(sg_list, 0, sizeof(*sg_list));
302
303 if (command != ZFCP_CFDC_IOC) {
304 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
305 retval = -ENOTTY;
306 goto out;
307 }
308
309 if ((sense_data_user = (void __user *) buffer) == NULL) {
310 ZFCP_LOG_INFO("sense data record is required\n");
311 retval = -EINVAL;
312 goto out;
313 }
314
315 retval = copy_from_user(sense_data, sense_data_user,
316 sizeof(struct zfcp_cfdc_sense_data));
317 if (retval) {
318 retval = -EFAULT;
319 goto out;
320 }
321
322 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
323 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
324 ZFCP_CFDC_SIGNATURE);
325 retval = -EINVAL;
326 goto out;
327 }
328
329 switch (sense_data->command) {
330
331 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
332 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
333 option = FSF_CFDC_OPTION_NORMAL_MODE;
334 break;
335
336 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
337 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
338 option = FSF_CFDC_OPTION_FORCE;
339 break;
340
341 case ZFCP_CFDC_CMND_FULL_ACCESS:
342 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
343 option = FSF_CFDC_OPTION_FULL_ACCESS;
344 break;
345
346 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
347 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
348 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
349 break;
350
351 case ZFCP_CFDC_CMND_UPLOAD:
352 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
353 option = 0;
354 break;
355
356 default:
357 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
358 sense_data->command);
359 retval = -EINVAL;
360 goto out;
361 }
362
363 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
364 if (bus_id == NULL) {
365 retval = -ENOMEM;
366 goto out;
367 }
368 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
369 (sense_data->devno >> 24),
370 (sense_data->devno >> 16) & 0xFF,
371 (sense_data->devno & 0xFFFF));
372
373 read_lock_irq(&zfcp_data.config_lock);
374 adapter = zfcp_get_adapter_by_busid(bus_id);
375 if (adapter)
376 zfcp_adapter_get(adapter);
377 read_unlock_irq(&zfcp_data.config_lock);
378
379 kfree(bus_id);
380
381 if (adapter == NULL) {
382 ZFCP_LOG_INFO("invalid adapter\n");
383 retval = -ENXIO;
384 goto out;
385 }
386
387 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
388 retval = zfcp_sg_list_alloc(sg_list,
389 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
390 if (retval) {
391 retval = -ENOMEM;
392 goto out;
393 }
394 }
395
396 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
397 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
398 retval = zfcp_sg_list_copy_from_user(
399 sg_list, &sense_data_user->control_file,
400 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
401 if (retval) {
402 retval = -EFAULT;
403 goto out;
404 }
405 }
406
407 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
408 option, sg_list);
409 if (retval)
410 goto out;
411
412 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
413 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
414 retval = -ENXIO;
415 goto out;
416 }
417
418 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
419 memcpy(&sense_data->fsf_status_qual,
420 &fsf_req->qtcb->header.fsf_status_qual,
421 sizeof(union fsf_status_qual));
422 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
423
424 retval = copy_to_user(sense_data_user, sense_data,
425 sizeof(struct zfcp_cfdc_sense_data));
426 if (retval) {
427 retval = -EFAULT;
428 goto out;
429 }
430
431 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
432 retval = zfcp_sg_list_copy_to_user(
433 &sense_data_user->control_file, sg_list,
434 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
435 if (retval) {
436 retval = -EFAULT;
437 goto out;
438 }
439 }
440
441 out:
442 if (fsf_req != NULL)
443 zfcp_fsf_req_free(fsf_req);
444
445 if ((adapter != NULL) && (retval != -ENXIO))
446 zfcp_adapter_put(adapter);
447
448 if (sg_list != NULL) {
449 zfcp_sg_list_free(sg_list);
450 kfree(sg_list);
451 }
452
453 if (sense_data != NULL)
454 kfree(sense_data);
455
456 return retval;
457 }
458
459
460 /**
461 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
462 * @sg_list: structure describing a scatter gather list
463 * @size: size of scatter-gather list
464 * Return: 0 on success, else -ENOMEM
465 *
466 * In sg_list->sg a pointer to the created scatter-gather list is returned,
467 * or NULL if we run out of memory. sg_list->count specifies the number of
468 * elements of the scatter-gather list. The maximum size of a single element
469 * in the scatter-gather list is PAGE_SIZE.
470 */
471 static inline int
472 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
473 {
474 struct scatterlist *sg;
475 unsigned int i;
476 int retval = 0;
477 void *address;
478
479 BUG_ON(sg_list == NULL);
480
481 sg_list->count = size >> PAGE_SHIFT;
482 if (size & ~PAGE_MASK)
483 sg_list->count++;
484 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
485 GFP_KERNEL);
486 if (sg_list->sg == NULL) {
487 sg_list->count = 0;
488 retval = -ENOMEM;
489 goto out;
490 }
491 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
492
493 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
494 sg->length = min(size, PAGE_SIZE);
495 sg->offset = 0;
496 address = (void *) get_zeroed_page(GFP_KERNEL);
497 if (address == NULL) {
498 sg_list->count = i;
499 zfcp_sg_list_free(sg_list);
500 retval = -ENOMEM;
501 goto out;
502 }
503 zfcp_address_to_sg(address, sg);
504 size -= sg->length;
505 }
506
507 out:
508 return retval;
509 }
510
511
512 /**
513 * zfcp_sg_list_free - free memory of a scatter-gather list
514 * @sg_list: structure describing a scatter-gather list
515 *
516 * Memory for each element in the scatter-gather list is freed.
517 * Finally sg_list->sg is freed itself and sg_list->count is reset.
518 */
519 static inline void
520 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
521 {
522 struct scatterlist *sg;
523 unsigned int i;
524
525 BUG_ON(sg_list == NULL);
526
527 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
528 free_page((unsigned long) zfcp_sg_to_address(sg));
529
530 sg_list->count = 0;
531 kfree(sg_list->sg);
532 }
533
534 /**
535 * zfcp_sg_size - determine size of a scatter-gather list
536 * @sg: array of (struct scatterlist)
537 * @sg_count: elements in array
538 * Return: size of entire scatter-gather list
539 */
540 size_t
541 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
542 {
543 unsigned int i;
544 struct scatterlist *p;
545 size_t size;
546
547 size = 0;
548 for (i = 0, p = sg; i < sg_count; i++, p++) {
549 BUG_ON(p == NULL);
550 size += p->length;
551 }
552
553 return size;
554 }
555
556
557 /**
558 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
559 * @sg_list: structure describing a scatter-gather list
560 * @user_buffer: pointer to buffer in user space
561 * @size: number of bytes to be copied
562 * Return: 0 on success, -EFAULT if copy_from_user fails.
563 */
564 static inline int
565 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
566 void __user *user_buffer,
567 size_t size)
568 {
569 struct scatterlist *sg;
570 unsigned int length;
571 void *zfcp_buffer;
572 int retval = 0;
573
574 BUG_ON(sg_list == NULL);
575
576 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
577 return -EFAULT;
578
579 for (sg = sg_list->sg; size > 0; sg++) {
580 length = min((unsigned int)size, sg->length);
581 zfcp_buffer = zfcp_sg_to_address(sg);
582 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
583 retval = -EFAULT;
584 goto out;
585 }
586 user_buffer += length;
587 size -= length;
588 }
589
590 out:
591 return retval;
592 }
593
594
595 /**
596 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
597 * @user_buffer: pointer to buffer in user space
598 * @sg_list: structure describing a scatter-gather list
599 * @size: number of bytes to be copied
600 * Return: 0 on success, -EFAULT if copy_to_user fails
601 */
602 static inline int
603 zfcp_sg_list_copy_to_user(void __user *user_buffer,
604 struct zfcp_sg_list *sg_list,
605 size_t size)
606 {
607 struct scatterlist *sg;
608 unsigned int length;
609 void *zfcp_buffer;
610 int retval = 0;
611
612 BUG_ON(sg_list == NULL);
613
614 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
615 return -EFAULT;
616
617 for (sg = sg_list->sg; size > 0; sg++) {
618 length = min((unsigned int) size, sg->length);
619 zfcp_buffer = zfcp_sg_to_address(sg);
620 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
621 retval = -EFAULT;
622 goto out;
623 }
624 user_buffer += length;
625 size -= length;
626 }
627
628 out:
629 return retval;
630 }
631
632
633 #undef ZFCP_LOG_AREA
634
635 /****************************************************************/
636 /****** Functions for configuration/set-up of structures ********/
637 /****************************************************************/
638
639 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
640
641 /**
642 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
643 * @port: pointer to port to search for unit
644 * @fcp_lun: FCP LUN to search for
645 * Traverse list of all units of a port and return pointer to a unit
646 * with the given FCP LUN.
647 */
648 struct zfcp_unit *
649 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
650 {
651 struct zfcp_unit *unit;
652 int found = 0;
653
654 list_for_each_entry(unit, &port->unit_list_head, list) {
655 if ((unit->fcp_lun == fcp_lun) &&
656 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
657 {
658 found = 1;
659 break;
660 }
661 }
662 return found ? unit : NULL;
663 }
664
665 /**
666 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
667 * @adapter: pointer to adapter to search for port
668 * @wwpn: wwpn to search for
669 * Traverse list of all ports of an adapter and return pointer to a port
670 * with the given wwpn.
671 */
672 struct zfcp_port *
673 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
674 {
675 struct zfcp_port *port;
676 int found = 0;
677
678 list_for_each_entry(port, &adapter->port_list_head, list) {
679 if ((port->wwpn == wwpn) &&
680 !(atomic_read(&port->status) &
681 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
682 found = 1;
683 break;
684 }
685 }
686 return found ? port : NULL;
687 }
688
689 /**
690 * zfcp_get_port_by_did - find port in port list of adapter by d_id
691 * @adapter: pointer to adapter to search for port
692 * @d_id: d_id to search for
693 * Traverse list of all ports of an adapter and return pointer to a port
694 * with the given d_id.
695 */
696 struct zfcp_port *
697 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
698 {
699 struct zfcp_port *port;
700 int found = 0;
701
702 list_for_each_entry(port, &adapter->port_list_head, list) {
703 if ((port->d_id == d_id) &&
704 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
705 {
706 found = 1;
707 break;
708 }
709 }
710 return found ? port : NULL;
711 }
712
713 /**
714 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
715 * @bus_id: bus_id to search for
716 * Traverse list of all adapters and return pointer to an adapter
717 * with the given bus_id.
718 */
719 struct zfcp_adapter *
720 zfcp_get_adapter_by_busid(char *bus_id)
721 {
722 struct zfcp_adapter *adapter;
723 int found = 0;
724
725 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
726 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
727 BUS_ID_SIZE) == 0) &&
728 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
729 &adapter->status)){
730 found = 1;
731 break;
732 }
733 }
734 return found ? adapter : NULL;
735 }
736
737 /**
738 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
739 * @port: pointer to port where unit is added
740 * @fcp_lun: FCP LUN of unit to be enqueued
741 * Return: pointer to enqueued unit on success, NULL on error
742 * Locks: config_sema must be held to serialize changes to the unit list
743 *
744 * Sets up some unit internal structures and creates sysfs entry.
745 */
746 struct zfcp_unit *
747 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
748 {
749 struct zfcp_unit *unit, *tmp_unit;
750 scsi_lun_t scsi_lun;
751 int found;
752
753 /*
754 * check that there is no unit with this FCP_LUN already in list
755 * and enqueue it.
756 * Note: Unlike for the adapter and the port, this is an error
757 */
758 read_lock_irq(&zfcp_data.config_lock);
759 unit = zfcp_get_unit_by_lun(port, fcp_lun);
760 read_unlock_irq(&zfcp_data.config_lock);
761 if (unit)
762 return NULL;
763
764 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
765 if (!unit)
766 return NULL;
767 memset(unit, 0, sizeof (struct zfcp_unit));
768
769 /* initialise reference count stuff */
770 atomic_set(&unit->refcount, 0);
771 init_waitqueue_head(&unit->remove_wq);
772
773 unit->port = port;
774 unit->fcp_lun = fcp_lun;
775
776 /* setup for sysfs registration */
777 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
778 unit->sysfs_device.parent = &port->sysfs_device;
779 unit->sysfs_device.release = zfcp_sysfs_unit_release;
780 dev_set_drvdata(&unit->sysfs_device, unit);
781
782 /* mark unit unusable as long as sysfs registration is not complete */
783 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
784
785 if (device_register(&unit->sysfs_device)) {
786 kfree(unit);
787 return NULL;
788 }
789
790 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
791 device_unregister(&unit->sysfs_device);
792 return NULL;
793 }
794
795 zfcp_unit_get(unit);
796
797 scsi_lun = 0;
798 found = 0;
799 write_lock_irq(&zfcp_data.config_lock);
800 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
801 if (tmp_unit->scsi_lun != scsi_lun) {
802 found = 1;
803 break;
804 }
805 scsi_lun++;
806 }
807 unit->scsi_lun = scsi_lun;
808 if (found)
809 list_add_tail(&unit->list, &tmp_unit->list);
810 else
811 list_add_tail(&unit->list, &port->unit_list_head);
812 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
813 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
814 write_unlock_irq(&zfcp_data.config_lock);
815
816 port->units++;
817 zfcp_port_get(port);
818
819 return unit;
820 }
821
822 void
823 zfcp_unit_dequeue(struct zfcp_unit *unit)
824 {
825 zfcp_unit_wait(unit);
826 write_lock_irq(&zfcp_data.config_lock);
827 list_del(&unit->list);
828 write_unlock_irq(&zfcp_data.config_lock);
829 unit->port->units--;
830 zfcp_port_put(unit->port);
831 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
832 device_unregister(&unit->sysfs_device);
833 }
834
835 static void *
836 zfcp_mempool_alloc(gfp_t gfp_mask, void *size)
837 {
838 return kmalloc((size_t) size, gfp_mask);
839 }
840
841 static void
842 zfcp_mempool_free(void *element, void *size)
843 {
844 kfree(element);
845 }
846
847 /*
848 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
849 * commands.
850 * It also genrates fcp-nameserver request/response buffer and unsolicited
851 * status read fsf_req buffers.
852 *
853 * locks: must only be called with zfcp_data.config_sema taken
854 */
855 static int
856 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
857 {
858 adapter->pool.fsf_req_erp =
859 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
860 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
861 sizeof(struct zfcp_fsf_req_pool_element));
862
863 if (NULL == adapter->pool.fsf_req_erp)
864 return -ENOMEM;
865
866 adapter->pool.fsf_req_scsi =
867 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
868 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
869 sizeof(struct zfcp_fsf_req_pool_element));
870
871 if (NULL == adapter->pool.fsf_req_scsi)
872 return -ENOMEM;
873
874 adapter->pool.fsf_req_abort =
875 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
876 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
877 sizeof(struct zfcp_fsf_req_pool_element));
878
879 if (NULL == adapter->pool.fsf_req_abort)
880 return -ENOMEM;
881
882 adapter->pool.fsf_req_status_read =
883 mempool_create(ZFCP_POOL_STATUS_READ_NR,
884 zfcp_mempool_alloc, zfcp_mempool_free,
885 (void *) sizeof(struct zfcp_fsf_req));
886
887 if (NULL == adapter->pool.fsf_req_status_read)
888 return -ENOMEM;
889
890 adapter->pool.data_status_read =
891 mempool_create(ZFCP_POOL_STATUS_READ_NR,
892 zfcp_mempool_alloc, zfcp_mempool_free,
893 (void *) sizeof(struct fsf_status_read_buffer));
894
895 if (NULL == adapter->pool.data_status_read)
896 return -ENOMEM;
897
898 adapter->pool.data_gid_pn =
899 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
900 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
901 sizeof(struct zfcp_gid_pn_data));
902
903 if (NULL == adapter->pool.data_gid_pn)
904 return -ENOMEM;
905
906 return 0;
907 }
908
909 /**
910 * zfcp_free_low_mem_buffers - free memory pools of an adapter
911 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
912 * locking: zfcp_data.config_sema must be held
913 */
914 static void
915 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
916 {
917 if (adapter->pool.fsf_req_erp)
918 mempool_destroy(adapter->pool.fsf_req_erp);
919 if (adapter->pool.fsf_req_scsi)
920 mempool_destroy(adapter->pool.fsf_req_scsi);
921 if (adapter->pool.fsf_req_abort)
922 mempool_destroy(adapter->pool.fsf_req_abort);
923 if (adapter->pool.fsf_req_status_read)
924 mempool_destroy(adapter->pool.fsf_req_status_read);
925 if (adapter->pool.data_status_read)
926 mempool_destroy(adapter->pool.data_status_read);
927 if (adapter->pool.data_gid_pn)
928 mempool_destroy(adapter->pool.data_gid_pn);
929 }
930
931 void
932 zfcp_dummy_release(struct device *dev)
933 {
934 return;
935 }
936
937 /*
938 * Enqueues an adapter at the end of the adapter list in the driver data.
939 * All adapter internal structures are set up.
940 * Proc-fs entries are also created.
941 *
942 * returns: 0 if a new adapter was successfully enqueued
943 * ZFCP_KNOWN if an adapter with this devno was already present
944 * -ENOMEM if alloc failed
945 * locks: config_sema must be held to serialise changes to the adapter list
946 */
947 struct zfcp_adapter *
948 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
949 {
950 int retval = 0;
951 struct zfcp_adapter *adapter;
952
953 /*
954 * Note: It is safe to release the list_lock, as any list changes
955 * are protected by the config_sema, which must be held to get here
956 */
957
958 /* try to allocate new adapter data structure (zeroed) */
959 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
960 if (!adapter) {
961 ZFCP_LOG_INFO("error: allocation of base adapter "
962 "structure failed\n");
963 goto out;
964 }
965 memset(adapter, 0, sizeof (struct zfcp_adapter));
966
967 ccw_device->handler = NULL;
968
969 /* save ccw_device pointer */
970 adapter->ccw_device = ccw_device;
971
972 retval = zfcp_qdio_allocate_queues(adapter);
973 if (retval)
974 goto queues_alloc_failed;
975
976 retval = zfcp_qdio_allocate(adapter);
977 if (retval)
978 goto qdio_allocate_failed;
979
980 retval = zfcp_allocate_low_mem_buffers(adapter);
981 if (retval) {
982 ZFCP_LOG_INFO("error: pool allocation failed\n");
983 goto failed_low_mem_buffers;
984 }
985
986 /* initialise reference count stuff */
987 atomic_set(&adapter->refcount, 0);
988 init_waitqueue_head(&adapter->remove_wq);
989
990 /* initialise list of ports */
991 INIT_LIST_HEAD(&adapter->port_list_head);
992
993 /* initialise list of ports to be removed */
994 INIT_LIST_HEAD(&adapter->port_remove_lh);
995
996 /* initialize list of fsf requests */
997 spin_lock_init(&adapter->fsf_req_list_lock);
998 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
999
1000 /* initialize abort lock */
1001 rwlock_init(&adapter->abort_lock);
1002
1003 /* initialise some erp stuff */
1004 init_waitqueue_head(&adapter->erp_thread_wqh);
1005 init_waitqueue_head(&adapter->erp_done_wqh);
1006
1007 /* initialize lock of associated request queue */
1008 rwlock_init(&adapter->request_queue.queue_lock);
1009
1010 /* intitialise SCSI ER timer */
1011 init_timer(&adapter->scsi_er_timer);
1012
1013 /* set FC service class used per default */
1014 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1015
1016 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1017 ASCEBC(adapter->name, strlen(adapter->name));
1018
1019 /* mark adapter unusable as long as sysfs registration is not complete */
1020 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1021
1022 adapter->ccw_device = ccw_device;
1023 dev_set_drvdata(&ccw_device->dev, adapter);
1024
1025 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1026 goto sysfs_failed;
1027
1028 adapter->generic_services.parent = &adapter->ccw_device->dev;
1029 adapter->generic_services.release = zfcp_dummy_release;
1030 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1031 "generic_services");
1032
1033 if (device_register(&adapter->generic_services))
1034 goto generic_services_failed;
1035
1036 /* put allocated adapter at list tail */
1037 write_lock_irq(&zfcp_data.config_lock);
1038 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1039 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1040 write_unlock_irq(&zfcp_data.config_lock);
1041
1042 zfcp_data.adapters++;
1043
1044 goto out;
1045
1046 generic_services_failed:
1047 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1048 sysfs_failed:
1049 dev_set_drvdata(&ccw_device->dev, NULL);
1050 failed_low_mem_buffers:
1051 zfcp_free_low_mem_buffers(adapter);
1052 if (qdio_free(ccw_device) != 0)
1053 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1054 zfcp_get_busid_by_adapter(adapter));
1055 qdio_allocate_failed:
1056 zfcp_qdio_free_queues(adapter);
1057 queues_alloc_failed:
1058 kfree(adapter);
1059 adapter = NULL;
1060 out:
1061 return adapter;
1062 }
1063
1064 /*
1065 * returns: 0 - struct zfcp_adapter data structure successfully removed
1066 * !0 - struct zfcp_adapter data structure could not be removed
1067 * (e.g. still used)
1068 * locks: adapter list write lock is assumed to be held by caller
1069 * adapter->fsf_req_list_lock is taken and released within this
1070 * function and must not be held on entry
1071 */
1072 void
1073 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1074 {
1075 int retval = 0;
1076 unsigned long flags;
1077
1078 device_unregister(&adapter->generic_services);
1079 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1080 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1081 /* sanity check: no pending FSF requests */
1082 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1083 retval = !list_empty(&adapter->fsf_req_list_head);
1084 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1085 if (retval) {
1086 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1087 "%i requests outstanding\n",
1088 zfcp_get_busid_by_adapter(adapter), adapter,
1089 atomic_read(&adapter->fsf_reqs_active));
1090 retval = -EBUSY;
1091 goto out;
1092 }
1093
1094 /* remove specified adapter data structure from list */
1095 write_lock_irq(&zfcp_data.config_lock);
1096 list_del(&adapter->list);
1097 write_unlock_irq(&zfcp_data.config_lock);
1098
1099 /* decrease number of adapters in list */
1100 zfcp_data.adapters--;
1101
1102 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1103 "%i adapters still in list\n",
1104 zfcp_get_busid_by_adapter(adapter),
1105 adapter, zfcp_data.adapters);
1106
1107 retval = qdio_free(adapter->ccw_device);
1108 if (retval)
1109 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1110 zfcp_get_busid_by_adapter(adapter));
1111
1112 zfcp_free_low_mem_buffers(adapter);
1113 /* free memory of adapter data structure and queues */
1114 zfcp_qdio_free_queues(adapter);
1115 ZFCP_LOG_TRACE("freeing adapter structure\n");
1116 kfree(adapter);
1117 out:
1118 return;
1119 }
1120
1121 /**
1122 * zfcp_port_enqueue - enqueue port to port list of adapter
1123 * @adapter: adapter where remote port is added
1124 * @wwpn: WWPN of the remote port to be enqueued
1125 * @status: initial status for the port
1126 * @d_id: destination id of the remote port to be enqueued
1127 * Return: pointer to enqueued port on success, NULL on error
1128 * Locks: config_sema must be held to serialize changes to the port list
1129 *
1130 * All port internal structures are set up and the sysfs entry is generated.
1131 * d_id is used to enqueue ports with a well known address like the Directory
1132 * Service for nameserver lookup.
1133 */
1134 struct zfcp_port *
1135 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1136 u32 d_id)
1137 {
1138 struct zfcp_port *port;
1139 int check_wwpn;
1140
1141 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1142 /*
1143 * check that there is no port with this WWPN already in list
1144 */
1145 if (check_wwpn) {
1146 read_lock_irq(&zfcp_data.config_lock);
1147 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1148 read_unlock_irq(&zfcp_data.config_lock);
1149 if (port)
1150 return NULL;
1151 }
1152
1153 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1154 if (!port)
1155 return NULL;
1156 memset(port, 0, sizeof (struct zfcp_port));
1157
1158 /* initialise reference count stuff */
1159 atomic_set(&port->refcount, 0);
1160 init_waitqueue_head(&port->remove_wq);
1161
1162 INIT_LIST_HEAD(&port->unit_list_head);
1163 INIT_LIST_HEAD(&port->unit_remove_lh);
1164
1165 port->adapter = adapter;
1166
1167 if (check_wwpn)
1168 port->wwpn = wwpn;
1169
1170 atomic_set_mask(status, &port->status);
1171
1172 /* setup for sysfs registration */
1173 if (status & ZFCP_STATUS_PORT_WKA) {
1174 switch (d_id) {
1175 case ZFCP_DID_DIRECTORY_SERVICE:
1176 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1177 "directory");
1178 break;
1179 case ZFCP_DID_MANAGEMENT_SERVICE:
1180 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1181 "management");
1182 break;
1183 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1184 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1185 "key_distribution");
1186 break;
1187 case ZFCP_DID_ALIAS_SERVICE:
1188 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1189 "alias");
1190 break;
1191 case ZFCP_DID_TIME_SERVICE:
1192 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1193 "time");
1194 break;
1195 default:
1196 kfree(port);
1197 return NULL;
1198 }
1199 port->d_id = d_id;
1200 port->sysfs_device.parent = &adapter->generic_services;
1201 } else {
1202 snprintf(port->sysfs_device.bus_id,
1203 BUS_ID_SIZE, "0x%016llx", wwpn);
1204 port->sysfs_device.parent = &adapter->ccw_device->dev;
1205 }
1206 port->sysfs_device.release = zfcp_sysfs_port_release;
1207 dev_set_drvdata(&port->sysfs_device, port);
1208
1209 /* mark port unusable as long as sysfs registration is not complete */
1210 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1211
1212 if (device_register(&port->sysfs_device)) {
1213 kfree(port);
1214 return NULL;
1215 }
1216
1217 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1218 device_unregister(&port->sysfs_device);
1219 return NULL;
1220 }
1221
1222 zfcp_port_get(port);
1223
1224 write_lock_irq(&zfcp_data.config_lock);
1225 list_add_tail(&port->list, &adapter->port_list_head);
1226 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1227 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1228 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1229 if (!adapter->nameserver_port)
1230 adapter->nameserver_port = port;
1231 adapter->ports++;
1232 write_unlock_irq(&zfcp_data.config_lock);
1233
1234 zfcp_adapter_get(adapter);
1235
1236 return port;
1237 }
1238
1239 void
1240 zfcp_port_dequeue(struct zfcp_port *port)
1241 {
1242 zfcp_port_wait(port);
1243 write_lock_irq(&zfcp_data.config_lock);
1244 list_del(&port->list);
1245 port->adapter->ports--;
1246 write_unlock_irq(&zfcp_data.config_lock);
1247 if (port->rport)
1248 fc_remote_port_delete(port->rport);
1249 port->rport = NULL;
1250 zfcp_adapter_put(port->adapter);
1251 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1252 atomic_read(&port->status));
1253 device_unregister(&port->sysfs_device);
1254 }
1255
1256 /* Enqueues a nameserver port */
1257 int
1258 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1259 {
1260 struct zfcp_port *port;
1261
1262 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1263 ZFCP_DID_DIRECTORY_SERVICE);
1264 if (!port) {
1265 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1266 "adapter %s failed\n",
1267 zfcp_get_busid_by_adapter(adapter));
1268 return -ENXIO;
1269 }
1270 zfcp_port_put(port);
1271
1272 return 0;
1273 }
1274
1275 #undef ZFCP_LOG_AREA
1276
1277 /****************************************************************/
1278 /******* Fibre Channel Standard related Functions **************/
1279 /****************************************************************/
1280
1281 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1282
1283 void
1284 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1285 struct fsf_status_read_buffer *status_buffer)
1286 {
1287 struct fcp_rscn_head *fcp_rscn_head;
1288 struct fcp_rscn_element *fcp_rscn_element;
1289 struct zfcp_port *port;
1290 u16 i;
1291 u16 no_entries;
1292 u32 range_mask;
1293 unsigned long flags;
1294
1295 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1296 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1297
1298 /* see FC-FS */
1299 no_entries = (fcp_rscn_head->payload_len / 4);
1300
1301 for (i = 1; i < no_entries; i++) {
1302 /* skip head and start with 1st element */
1303 fcp_rscn_element++;
1304 switch (fcp_rscn_element->addr_format) {
1305 case ZFCP_PORT_ADDRESS:
1306 range_mask = ZFCP_PORTS_RANGE_PORT;
1307 break;
1308 case ZFCP_AREA_ADDRESS:
1309 range_mask = ZFCP_PORTS_RANGE_AREA;
1310 break;
1311 case ZFCP_DOMAIN_ADDRESS:
1312 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1313 break;
1314 case ZFCP_FABRIC_ADDRESS:
1315 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1316 break;
1317 default:
1318 ZFCP_LOG_INFO("incoming RSCN with unknown "
1319 "address format\n");
1320 continue;
1321 }
1322 read_lock_irqsave(&zfcp_data.config_lock, flags);
1323 list_for_each_entry(port, &adapter->port_list_head, list) {
1324 if (atomic_test_mask
1325 (ZFCP_STATUS_PORT_WKA, &port->status))
1326 continue;
1327 /* Do we know this port? If not skip it. */
1328 if (!atomic_test_mask
1329 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1330 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1331 "port 0x%016Lx\n", port->wwpn);
1332 zfcp_erp_port_reopen(port,
1333 ZFCP_STATUS_COMMON_ERP_FAILED);
1334 continue;
1335 }
1336
1337 /*
1338 * FIXME: race: d_id might being invalidated
1339 * (...DID_DID reset)
1340 */
1341 if ((port->d_id & range_mask)
1342 == (fcp_rscn_element->nport_did & range_mask)) {
1343 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1344 fcp_rscn_element->nport_did);
1345 /*
1346 * Unfortunately, an RSCN does not specify the
1347 * type of change a target underwent. We assume
1348 * that it makes sense to reopen the link.
1349 * FIXME: Shall we try to find out more about
1350 * the target and link state before closing it?
1351 * How to accomplish this? (nameserver?)
1352 * Where would such code be put in?
1353 * (inside or outside erp)
1354 */
1355 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1356 "port 0x%016Lx\n", port->wwpn);
1357 zfcp_test_link(port);
1358 }
1359 }
1360 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1361 }
1362 }
1363
1364 static void
1365 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1366 struct fsf_status_read_buffer *status_buffer)
1367 {
1368 logi *els_logi = (logi *) status_buffer->payload;
1369 struct zfcp_port *port;
1370 unsigned long flags;
1371
1372 read_lock_irqsave(&zfcp_data.config_lock, flags);
1373 list_for_each_entry(port, &adapter->port_list_head, list) {
1374 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1375 break;
1376 }
1377 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1378
1379 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1380 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1381 "with d_id 0x%08x on adapter %s\n",
1382 status_buffer->d_id,
1383 zfcp_get_busid_by_adapter(adapter));
1384 } else {
1385 zfcp_erp_port_forced_reopen(port, 0);
1386 }
1387 }
1388
1389 static void
1390 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1391 struct fsf_status_read_buffer *status_buffer)
1392 {
1393 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1394 struct zfcp_port *port;
1395 unsigned long flags;
1396
1397 read_lock_irqsave(&zfcp_data.config_lock, flags);
1398 list_for_each_entry(port, &adapter->port_list_head, list) {
1399 if (port->wwpn == els_logo->nport_wwpn)
1400 break;
1401 }
1402 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1403
1404 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1405 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1406 "with d_id 0x%08x on adapter %s\n",
1407 status_buffer->d_id,
1408 zfcp_get_busid_by_adapter(adapter));
1409 } else {
1410 zfcp_erp_port_forced_reopen(port, 0);
1411 }
1412 }
1413
1414 static void
1415 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1416 struct fsf_status_read_buffer *status_buffer)
1417 {
1418 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1419 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1420 zfcp_get_busid_by_adapter(adapter));
1421
1422 }
1423
1424 void
1425 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1426 {
1427 struct fsf_status_read_buffer *status_buffer;
1428 u32 els_type;
1429 struct zfcp_adapter *adapter;
1430
1431 status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1432 els_type = *(u32 *) (status_buffer->payload);
1433 adapter = fsf_req->adapter;
1434
1435 zfcp_san_dbf_event_incoming_els(fsf_req);
1436 if (els_type == LS_PLOGI)
1437 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1438 else if (els_type == LS_LOGO)
1439 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1440 else if ((els_type & 0xffff0000) == LS_RSCN)
1441 /* we are only concerned with the command, not the length */
1442 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1443 else
1444 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1445 }
1446
1447
1448 /**
1449 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1450 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1451 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1452 */
1453 static int
1454 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1455 {
1456 struct zfcp_gid_pn_data *data;
1457
1458 if (pool != NULL) {
1459 data = mempool_alloc(pool, GFP_ATOMIC);
1460 if (likely(data != NULL)) {
1461 data->ct.pool = pool;
1462 }
1463 } else {
1464 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1465 }
1466
1467 if (NULL == data)
1468 return -ENOMEM;
1469
1470 memset(data, 0, sizeof(*data));
1471 data->ct.req = &data->req;
1472 data->ct.resp = &data->resp;
1473 data->ct.req_count = data->ct.resp_count = 1;
1474 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1475 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1476 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1477 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1478
1479 *gid_pn = data;
1480 return 0;
1481 }
1482
1483 /**
1484 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1485 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1486 */
1487 static void
1488 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1489 {
1490 if ((gid_pn->ct.pool != 0))
1491 mempool_free(gid_pn, gid_pn->ct.pool);
1492 else
1493 kfree(gid_pn);
1494
1495 return;
1496 }
1497
1498 /**
1499 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1500 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1501 */
1502 int
1503 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1504 {
1505 int ret;
1506 struct ct_iu_gid_pn_req *ct_iu_req;
1507 struct zfcp_gid_pn_data *gid_pn;
1508 struct zfcp_adapter *adapter = erp_action->adapter;
1509
1510 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1511 if (ret < 0) {
1512 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1513 "request failed for adapter %s\n",
1514 zfcp_get_busid_by_adapter(adapter));
1515 goto out;
1516 }
1517
1518 /* setup nameserver request */
1519 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1520 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1521 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1522 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1523 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1524 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1525 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1526 ct_iu_req->wwpn = erp_action->port->wwpn;
1527
1528 /* setup parameters for send generic command */
1529 gid_pn->ct.port = adapter->nameserver_port;
1530 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1531 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1532 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1533 gid_pn->ct.timer = &erp_action->timer;
1534 gid_pn->port = erp_action->port;
1535
1536 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1537 erp_action);
1538 if (ret) {
1539 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1540 "failed for adapter %s\n",
1541 zfcp_get_busid_by_adapter(adapter));
1542
1543 zfcp_gid_pn_buffers_free(gid_pn);
1544 }
1545
1546 out:
1547 return ret;
1548 }
1549
1550 /**
1551 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1552 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1553 */
1554 static void zfcp_ns_gid_pn_handler(unsigned long data)
1555 {
1556 struct zfcp_port *port;
1557 struct zfcp_send_ct *ct;
1558 struct ct_iu_gid_pn_req *ct_iu_req;
1559 struct ct_iu_gid_pn_resp *ct_iu_resp;
1560 struct zfcp_gid_pn_data *gid_pn;
1561
1562
1563 gid_pn = (struct zfcp_gid_pn_data *) data;
1564 port = gid_pn->port;
1565 ct = &gid_pn->ct;
1566 ct_iu_req = zfcp_sg_to_address(ct->req);
1567 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1568
1569 if (ct->status != 0)
1570 goto failed;
1571
1572 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1573 /* FIXME: do we need some specific erp entry points */
1574 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1575 goto failed;
1576 }
1577 /* paranoia */
1578 if (ct_iu_req->wwpn != port->wwpn) {
1579 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1580 "lookup does not match expected wwpn 0x%016Lx "
1581 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1582 zfcp_get_busid_by_port(port));
1583 goto mismatch;
1584 }
1585
1586 /* looks like a valid d_id */
1587 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1588 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1589 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1590 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1591 goto out;
1592
1593 mismatch:
1594 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1595 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1596 sizeof(struct ct_iu_gid_pn_req));
1597 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1598 sizeof(struct ct_iu_gid_pn_resp));
1599
1600 failed:
1601 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1602 "0x%016Lx for adapter %s\n",
1603 port->wwpn, zfcp_get_busid_by_port(port));
1604 out:
1605 zfcp_gid_pn_buffers_free(gid_pn);
1606 return;
1607 }
1608
1609 /* reject CT_IU reason codes acc. to FC-GS-4 */
1610 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1611 {0x01, "invalid command code"},
1612 {0x02, "invalid version level"},
1613 {0x03, "logical error"},
1614 {0x04, "invalid CT_IU size"},
1615 {0x05, "logical busy"},
1616 {0x07, "protocol error"},
1617 {0x09, "unable to perform command request"},
1618 {0x0b, "command not supported"},
1619 {0x0d, "server not available"},
1620 {0x0e, "session could not be established"},
1621 {0xff, "vendor specific error"},
1622 {0, NULL},
1623 };
1624
1625 /* LS_RJT reason codes acc. to FC-FS */
1626 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1627 {0x01, "invalid LS_Command code"},
1628 {0x03, "logical error"},
1629 {0x05, "logical busy"},
1630 {0x07, "protocol error"},
1631 {0x09, "unable to perform command request"},
1632 {0x0b, "command not supported"},
1633 {0x0e, "command already in progress"},
1634 {0xff, "vendor specific error"},
1635 {0, NULL},
1636 };
1637
1638 /* reject reason codes according to FC-PH/FC-FS */
1639 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1640 {0x01, "invalid D_ID"},
1641 {0x02, "invalid S_ID"},
1642 {0x03, "Nx_Port not available, temporary"},
1643 {0x04, "Nx_Port not available, permament"},
1644 {0x05, "class not supported"},
1645 {0x06, "delimiter usage error"},
1646 {0x07, "TYPE not supported"},
1647 {0x08, "invalid Link_Control"},
1648 {0x09, "invalid R_CTL field"},
1649 {0x0a, "invalid F_CTL field"},
1650 {0x0b, "invalid OX_ID"},
1651 {0x0c, "invalid RX_ID"},
1652 {0x0d, "invalid SEQ_ID"},
1653 {0x0e, "invalid DF_CTL"},
1654 {0x0f, "invalid SEQ_CNT"},
1655 {0x10, "invalid parameter field"},
1656 {0x11, "exchange error"},
1657 {0x12, "protocol error"},
1658 {0x13, "incorrect length"},
1659 {0x14, "unsupported ACK"},
1660 {0x15, "class of service not supported by entity at FFFFFE"},
1661 {0x16, "login required"},
1662 {0x17, "excessive sequences attempted"},
1663 {0x18, "unable to establish exchange"},
1664 {0x1a, "fabric path not available"},
1665 {0x1b, "invalid VC_ID (class 4)"},
1666 {0x1c, "invalid CS_CTL field"},
1667 {0x1d, "insufficient resources for VC (class 4)"},
1668 {0x1f, "invalid class of service"},
1669 {0x20, "preemption request rejected"},
1670 {0x21, "preemption not enabled"},
1671 {0x22, "multicast error"},
1672 {0x23, "multicast error terminate"},
1673 {0x24, "process login required"},
1674 {0xff, "vendor specific reject"},
1675 {0, NULL},
1676 };
1677
1678 /**
1679 * zfcp_rc_description - return description for given reaon code
1680 * @code: reason code
1681 * @rc_table: table of reason codes and descriptions
1682 */
1683 static inline const char *
1684 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1685 {
1686 const char *descr = "unknown reason code";
1687
1688 do {
1689 if (code == rc_table->code) {
1690 descr = rc_table->description;
1691 break;
1692 }
1693 rc_table++;
1694 } while (rc_table->code && rc_table->description);
1695
1696 return descr;
1697 }
1698
1699 /**
1700 * zfcp_check_ct_response - evaluate reason code for CT_IU
1701 * @rjt: response payload to an CT_IU request
1702 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1703 */
1704 int
1705 zfcp_check_ct_response(struct ct_hdr *rjt)
1706 {
1707 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1708 return 0;
1709
1710 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1711 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1712 "response code (0x%04hx)\n",
1713 rjt->cmd_rsp_code);
1714 return 1;
1715 }
1716
1717 ZFCP_LOG_INFO("Generic Service command rejected\n");
1718 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1719 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1720 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1721 (u32) rjt->vendor_unique);
1722
1723 return 1;
1724 }
1725
1726 /**
1727 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1728 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1729 * @rc_table: table of reason codes and descriptions
1730 */
1731 static inline void
1732 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1733 const struct zfcp_rc_entry *rc_table)
1734 {
1735 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1736 zfcp_rc_description(rjt_par->reason_code, rc_table),
1737 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1738 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1739 }
1740
1741 /**
1742 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1743 * @sq: status qualifier word
1744 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1745 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1746 */
1747 int
1748 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1749 {
1750 int ret = -EIO;
1751
1752 if (sq == FSF_IOSTAT_NPORT_RJT) {
1753 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1754 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1755 /* invalid d_id */
1756 if (rjt_par->reason_code == 0x01)
1757 ret = -EREMCHG;
1758 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1759 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1760 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1761 /* invalid d_id */
1762 if (rjt_par->reason_code == 0x01)
1763 ret = -EREMCHG;
1764 } else if (sq == FSF_IOSTAT_LS_RJT) {
1765 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1766 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1767 ret = -EREMOTEIO;
1768 } else
1769 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1770
1771 return ret;
1772 }
1773
1774 #undef ZFCP_LOG_AREA
Linux kernel - Deliverables
This page took 0.094022 seconds and 5 git commands to generate.