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[SCSI] zfcp: create private slab caches to guarantee proper data alignment
[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 /****************************************************************/
117 /****** Functions to handle the request ID hash table ********/
118 /****************************************************************/
119
120 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FSF
121
122 static int zfcp_reqlist_init(struct zfcp_adapter *adapter)
123 {
124 int i;
125
126 adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
127 GFP_KERNEL);
128
129 if (!adapter->req_list)
130 return -ENOMEM;
131
132 for (i=0; i<REQUEST_LIST_SIZE; i++)
133 INIT_LIST_HEAD(&adapter->req_list[i]);
134
135 return 0;
136 }
137
138 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
139 {
140 struct zfcp_fsf_req *request, *tmp;
141 unsigned int i;
142
143 for (i=0; i<REQUEST_LIST_SIZE; i++) {
144 if (list_empty(&adapter->req_list[i]))
145 continue;
146
147 list_for_each_entry_safe(request, tmp,
148 &adapter->req_list[i], list)
149 list_del(&request->list);
150 }
151
152 kfree(adapter->req_list);
153 }
154
155 void zfcp_reqlist_add(struct zfcp_adapter *adapter,
156 struct zfcp_fsf_req *fsf_req)
157 {
158 unsigned int i;
159
160 i = fsf_req->req_id % REQUEST_LIST_SIZE;
161 list_add_tail(&fsf_req->list, &adapter->req_list[i]);
162 }
163
164 void zfcp_reqlist_remove(struct zfcp_adapter *adapter, unsigned long req_id)
165 {
166 struct zfcp_fsf_req *request, *tmp;
167 unsigned int i, counter;
168 u64 dbg_tmp[2];
169
170 i = req_id % REQUEST_LIST_SIZE;
171 BUG_ON(list_empty(&adapter->req_list[i]));
172
173 counter = 0;
174 list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list) {
175 if (request->req_id == req_id) {
176 dbg_tmp[0] = (u64) atomic_read(&adapter->reqs_active);
177 dbg_tmp[1] = (u64) counter;
178 debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
179 list_del(&request->list);
180 break;
181 }
182 counter++;
183 }
184 }
185
186 struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *adapter,
187 unsigned long req_id)
188 {
189 struct zfcp_fsf_req *request, *tmp;
190 unsigned int i;
191
192 i = req_id % REQUEST_LIST_SIZE;
193
194 list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list)
195 if (request->req_id == req_id)
196 return request;
197
198 return NULL;
199 }
200
201 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
202 {
203 unsigned int i;
204
205 for (i=0; i<REQUEST_LIST_SIZE; i++)
206 if (!list_empty(&adapter->req_list[i]))
207 return 0;
208
209 return 1;
210 }
211
212 #undef ZFCP_LOG_AREA
213
214 /****************************************************************/
215 /************** Uncategorised Functions *************************/
216 /****************************************************************/
217
218 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
219
220 /**
221 * zfcp_device_setup - setup function
222 * @str: pointer to parameter string
223 *
224 * Parse "device=..." parameter string.
225 */
226 static int __init
227 zfcp_device_setup(char *devstr)
228 {
229 char *tmp, *str;
230 size_t len;
231
232 if (!devstr)
233 return 0;
234
235 len = strlen(devstr) + 1;
236 str = (char *) kmalloc(len, GFP_KERNEL);
237 if (!str)
238 goto err_out;
239 memcpy(str, devstr, len);
240
241 tmp = strchr(str, ',');
242 if (!tmp)
243 goto err_out;
244 *tmp++ = '\0';
245 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
246 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
247
248 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
249 if (*tmp++ != ',')
250 goto err_out;
251 if (*tmp == '\0')
252 goto err_out;
253
254 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
255 if (*tmp != '\0')
256 goto err_out;
257 kfree(str);
258 return 1;
259
260 err_out:
261 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
262 kfree(str);
263 return 0;
264 }
265
266 static void __init
267 zfcp_init_device_configure(void)
268 {
269 struct zfcp_adapter *adapter;
270 struct zfcp_port *port;
271 struct zfcp_unit *unit;
272
273 down(&zfcp_data.config_sema);
274 read_lock_irq(&zfcp_data.config_lock);
275 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
276 if (adapter)
277 zfcp_adapter_get(adapter);
278 read_unlock_irq(&zfcp_data.config_lock);
279
280 if (adapter == NULL)
281 goto out_adapter;
282 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
283 if (!port)
284 goto out_port;
285 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
286 if (!unit)
287 goto out_unit;
288 up(&zfcp_data.config_sema);
289 ccw_device_set_online(adapter->ccw_device);
290 zfcp_erp_wait(adapter);
291 down(&zfcp_data.config_sema);
292 zfcp_unit_put(unit);
293 out_unit:
294 zfcp_port_put(port);
295 out_port:
296 zfcp_adapter_put(adapter);
297 out_adapter:
298 up(&zfcp_data.config_sema);
299 return;
300 }
301
302 static int calc_alignment(int size)
303 {
304 int align = 1;
305
306 if (!size)
307 return 0;
308
309 while ((size - align) > 0)
310 align <<= 1;
311
312 return align;
313 }
314
315 static int __init
316 zfcp_module_init(void)
317 {
318 int retval = -ENOMEM;
319 int size, align;
320
321 size = sizeof(struct zfcp_fsf_req_qtcb);
322 align = calc_alignment(size);
323 zfcp_data.fsf_req_qtcb_cache =
324 kmem_cache_create("zfcp_fsf", size, align, 0, NULL, NULL);
325 if (!zfcp_data.fsf_req_qtcb_cache)
326 goto out;
327
328 size = sizeof(struct fsf_status_read_buffer);
329 align = calc_alignment(size);
330 zfcp_data.sr_buffer_cache =
331 kmem_cache_create("zfcp_sr", size, align, 0, NULL, NULL);
332 if (!zfcp_data.sr_buffer_cache)
333 goto out_sr_cache;
334
335 size = sizeof(struct zfcp_gid_pn_data);
336 align = calc_alignment(size);
337 zfcp_data.gid_pn_cache =
338 kmem_cache_create("zfcp_gid", size, align, 0, NULL, NULL);
339 if (!zfcp_data.gid_pn_cache)
340 goto out_gid_cache;
341
342 atomic_set(&zfcp_data.loglevel, loglevel);
343
344 /* initialize adapter list */
345 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
346
347 /* initialize adapters to be removed list head */
348 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
349
350 zfcp_data.scsi_transport_template =
351 fc_attach_transport(&zfcp_transport_functions);
352 if (!zfcp_data.scsi_transport_template)
353 goto out_transport;
354
355 retval = misc_register(&zfcp_cfdc_misc);
356 if (retval != 0) {
357 ZFCP_LOG_INFO("registration of misc device "
358 "zfcp_cfdc failed\n");
359 goto out_misc;
360 }
361
362 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
363 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
364
365 /* Initialise proc semaphores */
366 sema_init(&zfcp_data.config_sema, 1);
367
368 /* initialise configuration rw lock */
369 rwlock_init(&zfcp_data.config_lock);
370
371 /* setup dynamic I/O */
372 retval = zfcp_ccw_register();
373 if (retval) {
374 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
375 goto out_ccw_register;
376 }
377
378 if (zfcp_device_setup(device))
379 zfcp_init_device_configure();
380
381 goto out;
382
383 out_ccw_register:
384 misc_deregister(&zfcp_cfdc_misc);
385 out_misc:
386 fc_release_transport(zfcp_data.scsi_transport_template);
387 out_transport:
388 kmem_cache_destroy(zfcp_data.gid_pn_cache);
389 out_gid_cache:
390 kmem_cache_destroy(zfcp_data.sr_buffer_cache);
391 out_sr_cache:
392 kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
393 out:
394 return retval;
395 }
396
397 /*
398 * function: zfcp_cfdc_dev_ioctl
399 *
400 * purpose: Handle control file upload/download transaction via IOCTL
401 * interface
402 *
403 * returns: 0 - Operation completed successfuly
404 * -ENOTTY - Unknown IOCTL command
405 * -EINVAL - Invalid sense data record
406 * -ENXIO - The FCP adapter is not available
407 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
408 * -ENOMEM - Insufficient memory
409 * -EFAULT - User space memory I/O operation fault
410 * -EPERM - Cannot create or queue FSF request or create SBALs
411 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
412 */
413 static long
414 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
415 unsigned long buffer)
416 {
417 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
418 struct zfcp_adapter *adapter = NULL;
419 struct zfcp_fsf_req *fsf_req = NULL;
420 struct zfcp_sg_list *sg_list = NULL;
421 u32 fsf_command, option;
422 char *bus_id = NULL;
423 int retval = 0;
424
425 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
426 if (sense_data == NULL) {
427 retval = -ENOMEM;
428 goto out;
429 }
430
431 sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
432 if (sg_list == NULL) {
433 retval = -ENOMEM;
434 goto out;
435 }
436
437 if (command != ZFCP_CFDC_IOC) {
438 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
439 retval = -ENOTTY;
440 goto out;
441 }
442
443 if ((sense_data_user = (void __user *) buffer) == NULL) {
444 ZFCP_LOG_INFO("sense data record is required\n");
445 retval = -EINVAL;
446 goto out;
447 }
448
449 retval = copy_from_user(sense_data, sense_data_user,
450 sizeof(struct zfcp_cfdc_sense_data));
451 if (retval) {
452 retval = -EFAULT;
453 goto out;
454 }
455
456 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
457 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
458 ZFCP_CFDC_SIGNATURE);
459 retval = -EINVAL;
460 goto out;
461 }
462
463 switch (sense_data->command) {
464
465 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
466 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
467 option = FSF_CFDC_OPTION_NORMAL_MODE;
468 break;
469
470 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
471 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
472 option = FSF_CFDC_OPTION_FORCE;
473 break;
474
475 case ZFCP_CFDC_CMND_FULL_ACCESS:
476 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
477 option = FSF_CFDC_OPTION_FULL_ACCESS;
478 break;
479
480 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
481 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
482 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
483 break;
484
485 case ZFCP_CFDC_CMND_UPLOAD:
486 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
487 option = 0;
488 break;
489
490 default:
491 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
492 sense_data->command);
493 retval = -EINVAL;
494 goto out;
495 }
496
497 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
498 if (bus_id == NULL) {
499 retval = -ENOMEM;
500 goto out;
501 }
502 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
503 (sense_data->devno >> 24),
504 (sense_data->devno >> 16) & 0xFF,
505 (sense_data->devno & 0xFFFF));
506
507 read_lock_irq(&zfcp_data.config_lock);
508 adapter = zfcp_get_adapter_by_busid(bus_id);
509 if (adapter)
510 zfcp_adapter_get(adapter);
511 read_unlock_irq(&zfcp_data.config_lock);
512
513 kfree(bus_id);
514
515 if (adapter == NULL) {
516 ZFCP_LOG_INFO("invalid adapter\n");
517 retval = -ENXIO;
518 goto out;
519 }
520
521 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
522 retval = zfcp_sg_list_alloc(sg_list,
523 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
524 if (retval) {
525 retval = -ENOMEM;
526 goto out;
527 }
528 }
529
530 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
531 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
532 retval = zfcp_sg_list_copy_from_user(
533 sg_list, &sense_data_user->control_file,
534 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
535 if (retval) {
536 retval = -EFAULT;
537 goto out;
538 }
539 }
540
541 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
542 option, sg_list);
543 if (retval)
544 goto out;
545
546 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
547 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
548 retval = -ENXIO;
549 goto out;
550 }
551
552 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
553 memcpy(&sense_data->fsf_status_qual,
554 &fsf_req->qtcb->header.fsf_status_qual,
555 sizeof(union fsf_status_qual));
556 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
557
558 retval = copy_to_user(sense_data_user, sense_data,
559 sizeof(struct zfcp_cfdc_sense_data));
560 if (retval) {
561 retval = -EFAULT;
562 goto out;
563 }
564
565 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
566 retval = zfcp_sg_list_copy_to_user(
567 &sense_data_user->control_file, sg_list,
568 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
569 if (retval) {
570 retval = -EFAULT;
571 goto out;
572 }
573 }
574
575 out:
576 if (fsf_req != NULL)
577 zfcp_fsf_req_free(fsf_req);
578
579 if ((adapter != NULL) && (retval != -ENXIO))
580 zfcp_adapter_put(adapter);
581
582 if (sg_list != NULL) {
583 zfcp_sg_list_free(sg_list);
584 kfree(sg_list);
585 }
586
587 kfree(sense_data);
588
589 return retval;
590 }
591
592
593 /**
594 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
595 * @sg_list: structure describing a scatter gather list
596 * @size: size of scatter-gather list
597 * Return: 0 on success, else -ENOMEM
598 *
599 * In sg_list->sg a pointer to the created scatter-gather list is returned,
600 * or NULL if we run out of memory. sg_list->count specifies the number of
601 * elements of the scatter-gather list. The maximum size of a single element
602 * in the scatter-gather list is PAGE_SIZE.
603 */
604 static inline int
605 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
606 {
607 struct scatterlist *sg;
608 unsigned int i;
609 int retval = 0;
610 void *address;
611
612 BUG_ON(sg_list == NULL);
613
614 sg_list->count = size >> PAGE_SHIFT;
615 if (size & ~PAGE_MASK)
616 sg_list->count++;
617 sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
618 GFP_KERNEL);
619 if (sg_list->sg == NULL) {
620 sg_list->count = 0;
621 retval = -ENOMEM;
622 goto out;
623 }
624
625 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
626 sg->length = min(size, PAGE_SIZE);
627 sg->offset = 0;
628 address = (void *) get_zeroed_page(GFP_KERNEL);
629 if (address == NULL) {
630 sg_list->count = i;
631 zfcp_sg_list_free(sg_list);
632 retval = -ENOMEM;
633 goto out;
634 }
635 zfcp_address_to_sg(address, sg);
636 size -= sg->length;
637 }
638
639 out:
640 return retval;
641 }
642
643
644 /**
645 * zfcp_sg_list_free - free memory of a scatter-gather list
646 * @sg_list: structure describing a scatter-gather list
647 *
648 * Memory for each element in the scatter-gather list is freed.
649 * Finally sg_list->sg is freed itself and sg_list->count is reset.
650 */
651 static inline void
652 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
653 {
654 struct scatterlist *sg;
655 unsigned int i;
656
657 BUG_ON(sg_list == NULL);
658
659 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
660 free_page((unsigned long) zfcp_sg_to_address(sg));
661
662 sg_list->count = 0;
663 kfree(sg_list->sg);
664 }
665
666 /**
667 * zfcp_sg_size - determine size of a scatter-gather list
668 * @sg: array of (struct scatterlist)
669 * @sg_count: elements in array
670 * Return: size of entire scatter-gather list
671 */
672 size_t
673 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
674 {
675 unsigned int i;
676 struct scatterlist *p;
677 size_t size;
678
679 size = 0;
680 for (i = 0, p = sg; i < sg_count; i++, p++) {
681 BUG_ON(p == NULL);
682 size += p->length;
683 }
684
685 return size;
686 }
687
688
689 /**
690 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
691 * @sg_list: structure describing a scatter-gather list
692 * @user_buffer: pointer to buffer in user space
693 * @size: number of bytes to be copied
694 * Return: 0 on success, -EFAULT if copy_from_user fails.
695 */
696 static inline int
697 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
698 void __user *user_buffer,
699 size_t size)
700 {
701 struct scatterlist *sg;
702 unsigned int length;
703 void *zfcp_buffer;
704 int retval = 0;
705
706 BUG_ON(sg_list == NULL);
707
708 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
709 return -EFAULT;
710
711 for (sg = sg_list->sg; size > 0; sg++) {
712 length = min((unsigned int)size, sg->length);
713 zfcp_buffer = zfcp_sg_to_address(sg);
714 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
715 retval = -EFAULT;
716 goto out;
717 }
718 user_buffer += length;
719 size -= length;
720 }
721
722 out:
723 return retval;
724 }
725
726
727 /**
728 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
729 * @user_buffer: pointer to buffer in user space
730 * @sg_list: structure describing a scatter-gather list
731 * @size: number of bytes to be copied
732 * Return: 0 on success, -EFAULT if copy_to_user fails
733 */
734 static inline int
735 zfcp_sg_list_copy_to_user(void __user *user_buffer,
736 struct zfcp_sg_list *sg_list,
737 size_t size)
738 {
739 struct scatterlist *sg;
740 unsigned int length;
741 void *zfcp_buffer;
742 int retval = 0;
743
744 BUG_ON(sg_list == NULL);
745
746 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
747 return -EFAULT;
748
749 for (sg = sg_list->sg; size > 0; sg++) {
750 length = min((unsigned int) size, sg->length);
751 zfcp_buffer = zfcp_sg_to_address(sg);
752 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
753 retval = -EFAULT;
754 goto out;
755 }
756 user_buffer += length;
757 size -= length;
758 }
759
760 out:
761 return retval;
762 }
763
764
765 #undef ZFCP_LOG_AREA
766
767 /****************************************************************/
768 /****** Functions for configuration/set-up of structures ********/
769 /****************************************************************/
770
771 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
772
773 /**
774 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
775 * @port: pointer to port to search for unit
776 * @fcp_lun: FCP LUN to search for
777 * Traverse list of all units of a port and return pointer to a unit
778 * with the given FCP LUN.
779 */
780 struct zfcp_unit *
781 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
782 {
783 struct zfcp_unit *unit;
784 int found = 0;
785
786 list_for_each_entry(unit, &port->unit_list_head, list) {
787 if ((unit->fcp_lun == fcp_lun) &&
788 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
789 {
790 found = 1;
791 break;
792 }
793 }
794 return found ? unit : NULL;
795 }
796
797 /**
798 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
799 * @adapter: pointer to adapter to search for port
800 * @wwpn: wwpn to search for
801 * Traverse list of all ports of an adapter and return pointer to a port
802 * with the given wwpn.
803 */
804 struct zfcp_port *
805 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
806 {
807 struct zfcp_port *port;
808 int found = 0;
809
810 list_for_each_entry(port, &adapter->port_list_head, list) {
811 if ((port->wwpn == wwpn) &&
812 !(atomic_read(&port->status) &
813 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
814 found = 1;
815 break;
816 }
817 }
818 return found ? port : NULL;
819 }
820
821 /**
822 * zfcp_get_port_by_did - find port in port list of adapter by d_id
823 * @adapter: pointer to adapter to search for port
824 * @d_id: d_id to search for
825 * Traverse list of all ports of an adapter and return pointer to a port
826 * with the given d_id.
827 */
828 struct zfcp_port *
829 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
830 {
831 struct zfcp_port *port;
832 int found = 0;
833
834 list_for_each_entry(port, &adapter->port_list_head, list) {
835 if ((port->d_id == d_id) &&
836 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
837 {
838 found = 1;
839 break;
840 }
841 }
842 return found ? port : NULL;
843 }
844
845 /**
846 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
847 * @bus_id: bus_id to search for
848 * Traverse list of all adapters and return pointer to an adapter
849 * with the given bus_id.
850 */
851 struct zfcp_adapter *
852 zfcp_get_adapter_by_busid(char *bus_id)
853 {
854 struct zfcp_adapter *adapter;
855 int found = 0;
856
857 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
858 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
859 BUS_ID_SIZE) == 0) &&
860 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
861 &adapter->status)){
862 found = 1;
863 break;
864 }
865 }
866 return found ? adapter : NULL;
867 }
868
869 /**
870 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
871 * @port: pointer to port where unit is added
872 * @fcp_lun: FCP LUN of unit to be enqueued
873 * Return: pointer to enqueued unit on success, NULL on error
874 * Locks: config_sema must be held to serialize changes to the unit list
875 *
876 * Sets up some unit internal structures and creates sysfs entry.
877 */
878 struct zfcp_unit *
879 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
880 {
881 struct zfcp_unit *unit, *tmp_unit;
882 unsigned int scsi_lun;
883 int found;
884
885 /*
886 * check that there is no unit with this FCP_LUN already in list
887 * and enqueue it.
888 * Note: Unlike for the adapter and the port, this is an error
889 */
890 read_lock_irq(&zfcp_data.config_lock);
891 unit = zfcp_get_unit_by_lun(port, fcp_lun);
892 read_unlock_irq(&zfcp_data.config_lock);
893 if (unit)
894 return NULL;
895
896 unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
897 if (!unit)
898 return NULL;
899
900 /* initialise reference count stuff */
901 atomic_set(&unit->refcount, 0);
902 init_waitqueue_head(&unit->remove_wq);
903
904 unit->port = port;
905 unit->fcp_lun = fcp_lun;
906
907 /* setup for sysfs registration */
908 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
909 unit->sysfs_device.parent = &port->sysfs_device;
910 unit->sysfs_device.release = zfcp_sysfs_unit_release;
911 dev_set_drvdata(&unit->sysfs_device, unit);
912
913 /* mark unit unusable as long as sysfs registration is not complete */
914 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
915
916 if (device_register(&unit->sysfs_device)) {
917 kfree(unit);
918 return NULL;
919 }
920
921 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
922 device_unregister(&unit->sysfs_device);
923 return NULL;
924 }
925
926 zfcp_unit_get(unit);
927
928 scsi_lun = 0;
929 found = 0;
930 write_lock_irq(&zfcp_data.config_lock);
931 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
932 if (tmp_unit->scsi_lun != scsi_lun) {
933 found = 1;
934 break;
935 }
936 scsi_lun++;
937 }
938 unit->scsi_lun = scsi_lun;
939 if (found)
940 list_add_tail(&unit->list, &tmp_unit->list);
941 else
942 list_add_tail(&unit->list, &port->unit_list_head);
943 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
944 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
945 write_unlock_irq(&zfcp_data.config_lock);
946
947 port->units++;
948 zfcp_port_get(port);
949
950 return unit;
951 }
952
953 void
954 zfcp_unit_dequeue(struct zfcp_unit *unit)
955 {
956 zfcp_unit_wait(unit);
957 write_lock_irq(&zfcp_data.config_lock);
958 list_del(&unit->list);
959 write_unlock_irq(&zfcp_data.config_lock);
960 unit->port->units--;
961 zfcp_port_put(unit->port);
962 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
963 device_unregister(&unit->sysfs_device);
964 }
965
966 /*
967 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
968 * commands.
969 * It also genrates fcp-nameserver request/response buffer and unsolicited
970 * status read fsf_req buffers.
971 *
972 * locks: must only be called with zfcp_data.config_sema taken
973 */
974 static int
975 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
976 {
977 adapter->pool.fsf_req_erp =
978 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
979 zfcp_data.fsf_req_qtcb_cache);
980 if (!adapter->pool.fsf_req_erp)
981 return -ENOMEM;
982
983 adapter->pool.fsf_req_scsi =
984 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
985 zfcp_data.fsf_req_qtcb_cache);
986 if (!adapter->pool.fsf_req_scsi)
987 return -ENOMEM;
988
989 adapter->pool.fsf_req_abort =
990 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
991 zfcp_data.fsf_req_qtcb_cache);
992 if (!adapter->pool.fsf_req_abort)
993 return -ENOMEM;
994
995 adapter->pool.fsf_req_status_read =
996 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
997 sizeof(struct zfcp_fsf_req));
998 if (!adapter->pool.fsf_req_status_read)
999 return -ENOMEM;
1000
1001 adapter->pool.data_status_read =
1002 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
1003 zfcp_data.sr_buffer_cache);
1004 if (!adapter->pool.data_status_read)
1005 return -ENOMEM;
1006
1007 adapter->pool.data_gid_pn =
1008 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
1009 zfcp_data.gid_pn_cache);
1010 if (!adapter->pool.data_gid_pn)
1011 return -ENOMEM;
1012
1013 return 0;
1014 }
1015
1016 /**
1017 * zfcp_free_low_mem_buffers - free memory pools of an adapter
1018 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
1019 * locking: zfcp_data.config_sema must be held
1020 */
1021 static void
1022 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1023 {
1024 if (adapter->pool.fsf_req_erp)
1025 mempool_destroy(adapter->pool.fsf_req_erp);
1026 if (adapter->pool.fsf_req_scsi)
1027 mempool_destroy(adapter->pool.fsf_req_scsi);
1028 if (adapter->pool.fsf_req_abort)
1029 mempool_destroy(adapter->pool.fsf_req_abort);
1030 if (adapter->pool.fsf_req_status_read)
1031 mempool_destroy(adapter->pool.fsf_req_status_read);
1032 if (adapter->pool.data_status_read)
1033 mempool_destroy(adapter->pool.data_status_read);
1034 if (adapter->pool.data_gid_pn)
1035 mempool_destroy(adapter->pool.data_gid_pn);
1036 }
1037
1038 void
1039 zfcp_dummy_release(struct device *dev)
1040 {
1041 return;
1042 }
1043
1044 /*
1045 * Enqueues an adapter at the end of the adapter list in the driver data.
1046 * All adapter internal structures are set up.
1047 * Proc-fs entries are also created.
1048 *
1049 * returns: 0 if a new adapter was successfully enqueued
1050 * ZFCP_KNOWN if an adapter with this devno was already present
1051 * -ENOMEM if alloc failed
1052 * locks: config_sema must be held to serialise changes to the adapter list
1053 */
1054 struct zfcp_adapter *
1055 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1056 {
1057 int retval = 0;
1058 struct zfcp_adapter *adapter;
1059
1060 /*
1061 * Note: It is safe to release the list_lock, as any list changes
1062 * are protected by the config_sema, which must be held to get here
1063 */
1064
1065 /* try to allocate new adapter data structure (zeroed) */
1066 adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1067 if (!adapter) {
1068 ZFCP_LOG_INFO("error: allocation of base adapter "
1069 "structure failed\n");
1070 goto out;
1071 }
1072
1073 ccw_device->handler = NULL;
1074
1075 /* save ccw_device pointer */
1076 adapter->ccw_device = ccw_device;
1077
1078 retval = zfcp_qdio_allocate_queues(adapter);
1079 if (retval)
1080 goto queues_alloc_failed;
1081
1082 retval = zfcp_qdio_allocate(adapter);
1083 if (retval)
1084 goto qdio_allocate_failed;
1085
1086 retval = zfcp_allocate_low_mem_buffers(adapter);
1087 if (retval) {
1088 ZFCP_LOG_INFO("error: pool allocation failed\n");
1089 goto failed_low_mem_buffers;
1090 }
1091
1092 /* initialise reference count stuff */
1093 atomic_set(&adapter->refcount, 0);
1094 init_waitqueue_head(&adapter->remove_wq);
1095
1096 /* initialise list of ports */
1097 INIT_LIST_HEAD(&adapter->port_list_head);
1098
1099 /* initialise list of ports to be removed */
1100 INIT_LIST_HEAD(&adapter->port_remove_lh);
1101
1102 /* initialize list of fsf requests */
1103 spin_lock_init(&adapter->req_list_lock);
1104 retval = zfcp_reqlist_init(adapter);
1105 if (retval) {
1106 ZFCP_LOG_INFO("request list initialization failed\n");
1107 goto failed_low_mem_buffers;
1108 }
1109
1110 /* initialize debug locks */
1111
1112 spin_lock_init(&adapter->erp_dbf_lock);
1113 spin_lock_init(&adapter->hba_dbf_lock);
1114 spin_lock_init(&adapter->san_dbf_lock);
1115 spin_lock_init(&adapter->scsi_dbf_lock);
1116
1117 /* initialize error recovery stuff */
1118
1119 rwlock_init(&adapter->erp_lock);
1120 sema_init(&adapter->erp_ready_sem, 0);
1121 INIT_LIST_HEAD(&adapter->erp_ready_head);
1122 INIT_LIST_HEAD(&adapter->erp_running_head);
1123
1124 /* initialize abort lock */
1125 rwlock_init(&adapter->abort_lock);
1126
1127 /* initialise some erp stuff */
1128 init_waitqueue_head(&adapter->erp_thread_wqh);
1129 init_waitqueue_head(&adapter->erp_done_wqh);
1130
1131 /* initialize lock of associated request queue */
1132 rwlock_init(&adapter->request_queue.queue_lock);
1133
1134 /* intitialise SCSI ER timer */
1135 init_timer(&adapter->scsi_er_timer);
1136
1137 /* mark adapter unusable as long as sysfs registration is not complete */
1138 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1139
1140 adapter->ccw_device = ccw_device;
1141 dev_set_drvdata(&ccw_device->dev, adapter);
1142
1143 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1144 goto sysfs_failed;
1145
1146 adapter->generic_services.parent = &adapter->ccw_device->dev;
1147 adapter->generic_services.release = zfcp_dummy_release;
1148 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1149 "generic_services");
1150
1151 if (device_register(&adapter->generic_services))
1152 goto generic_services_failed;
1153
1154 /* put allocated adapter at list tail */
1155 write_lock_irq(&zfcp_data.config_lock);
1156 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1157 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1158 write_unlock_irq(&zfcp_data.config_lock);
1159
1160 zfcp_data.adapters++;
1161
1162 goto out;
1163
1164 generic_services_failed:
1165 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1166 sysfs_failed:
1167 dev_set_drvdata(&ccw_device->dev, NULL);
1168 failed_low_mem_buffers:
1169 zfcp_free_low_mem_buffers(adapter);
1170 if (qdio_free(ccw_device) != 0)
1171 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1172 zfcp_get_busid_by_adapter(adapter));
1173 qdio_allocate_failed:
1174 zfcp_qdio_free_queues(adapter);
1175 queues_alloc_failed:
1176 kfree(adapter);
1177 adapter = NULL;
1178 out:
1179 return adapter;
1180 }
1181
1182 /*
1183 * returns: 0 - struct zfcp_adapter data structure successfully removed
1184 * !0 - struct zfcp_adapter data structure could not be removed
1185 * (e.g. still used)
1186 * locks: adapter list write lock is assumed to be held by caller
1187 */
1188 void
1189 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1190 {
1191 int retval = 0;
1192 unsigned long flags;
1193
1194 device_unregister(&adapter->generic_services);
1195 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1196 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1197 /* sanity check: no pending FSF requests */
1198 spin_lock_irqsave(&adapter->req_list_lock, flags);
1199 retval = zfcp_reqlist_isempty(adapter);
1200 spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1201 if (!retval) {
1202 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1203 "%i requests outstanding\n",
1204 zfcp_get_busid_by_adapter(adapter), adapter,
1205 atomic_read(&adapter->reqs_active));
1206 retval = -EBUSY;
1207 goto out;
1208 }
1209
1210 /* remove specified adapter data structure from list */
1211 write_lock_irq(&zfcp_data.config_lock);
1212 list_del(&adapter->list);
1213 write_unlock_irq(&zfcp_data.config_lock);
1214
1215 /* decrease number of adapters in list */
1216 zfcp_data.adapters--;
1217
1218 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1219 "%i adapters still in list\n",
1220 zfcp_get_busid_by_adapter(adapter),
1221 adapter, zfcp_data.adapters);
1222
1223 retval = qdio_free(adapter->ccw_device);
1224 if (retval)
1225 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1226 zfcp_get_busid_by_adapter(adapter));
1227
1228 zfcp_free_low_mem_buffers(adapter);
1229 /* free memory of adapter data structure and queues */
1230 zfcp_qdio_free_queues(adapter);
1231 zfcp_reqlist_free(adapter);
1232 kfree(adapter->fc_stats);
1233 kfree(adapter->stats_reset_data);
1234 ZFCP_LOG_TRACE("freeing adapter structure\n");
1235 kfree(adapter);
1236 out:
1237 return;
1238 }
1239
1240 /**
1241 * zfcp_port_enqueue - enqueue port to port list of adapter
1242 * @adapter: adapter where remote port is added
1243 * @wwpn: WWPN of the remote port to be enqueued
1244 * @status: initial status for the port
1245 * @d_id: destination id of the remote port to be enqueued
1246 * Return: pointer to enqueued port on success, NULL on error
1247 * Locks: config_sema must be held to serialize changes to the port list
1248 *
1249 * All port internal structures are set up and the sysfs entry is generated.
1250 * d_id is used to enqueue ports with a well known address like the Directory
1251 * Service for nameserver lookup.
1252 */
1253 struct zfcp_port *
1254 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1255 u32 d_id)
1256 {
1257 struct zfcp_port *port;
1258 int check_wwpn;
1259
1260 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1261 /*
1262 * check that there is no port with this WWPN already in list
1263 */
1264 if (check_wwpn) {
1265 read_lock_irq(&zfcp_data.config_lock);
1266 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1267 read_unlock_irq(&zfcp_data.config_lock);
1268 if (port)
1269 return NULL;
1270 }
1271
1272 port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1273 if (!port)
1274 return NULL;
1275
1276 /* initialise reference count stuff */
1277 atomic_set(&port->refcount, 0);
1278 init_waitqueue_head(&port->remove_wq);
1279
1280 INIT_LIST_HEAD(&port->unit_list_head);
1281 INIT_LIST_HEAD(&port->unit_remove_lh);
1282
1283 port->adapter = adapter;
1284
1285 if (check_wwpn)
1286 port->wwpn = wwpn;
1287
1288 atomic_set_mask(status, &port->status);
1289
1290 /* setup for sysfs registration */
1291 if (status & ZFCP_STATUS_PORT_WKA) {
1292 switch (d_id) {
1293 case ZFCP_DID_DIRECTORY_SERVICE:
1294 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1295 "directory");
1296 break;
1297 case ZFCP_DID_MANAGEMENT_SERVICE:
1298 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1299 "management");
1300 break;
1301 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1302 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1303 "key_distribution");
1304 break;
1305 case ZFCP_DID_ALIAS_SERVICE:
1306 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1307 "alias");
1308 break;
1309 case ZFCP_DID_TIME_SERVICE:
1310 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1311 "time");
1312 break;
1313 default:
1314 kfree(port);
1315 return NULL;
1316 }
1317 port->d_id = d_id;
1318 port->sysfs_device.parent = &adapter->generic_services;
1319 } else {
1320 snprintf(port->sysfs_device.bus_id,
1321 BUS_ID_SIZE, "0x%016llx", wwpn);
1322 port->sysfs_device.parent = &adapter->ccw_device->dev;
1323 }
1324 port->sysfs_device.release = zfcp_sysfs_port_release;
1325 dev_set_drvdata(&port->sysfs_device, port);
1326
1327 /* mark port unusable as long as sysfs registration is not complete */
1328 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1329
1330 if (device_register(&port->sysfs_device)) {
1331 kfree(port);
1332 return NULL;
1333 }
1334
1335 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1336 device_unregister(&port->sysfs_device);
1337 return NULL;
1338 }
1339
1340 zfcp_port_get(port);
1341
1342 write_lock_irq(&zfcp_data.config_lock);
1343 list_add_tail(&port->list, &adapter->port_list_head);
1344 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1345 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1346 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1347 if (!adapter->nameserver_port)
1348 adapter->nameserver_port = port;
1349 adapter->ports++;
1350 write_unlock_irq(&zfcp_data.config_lock);
1351
1352 zfcp_adapter_get(adapter);
1353
1354 return port;
1355 }
1356
1357 void
1358 zfcp_port_dequeue(struct zfcp_port *port)
1359 {
1360 zfcp_port_wait(port);
1361 write_lock_irq(&zfcp_data.config_lock);
1362 list_del(&port->list);
1363 port->adapter->ports--;
1364 write_unlock_irq(&zfcp_data.config_lock);
1365 if (port->rport)
1366 fc_remote_port_delete(port->rport);
1367 port->rport = NULL;
1368 zfcp_adapter_put(port->adapter);
1369 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1370 atomic_read(&port->status));
1371 device_unregister(&port->sysfs_device);
1372 }
1373
1374 /* Enqueues a nameserver port */
1375 int
1376 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1377 {
1378 struct zfcp_port *port;
1379
1380 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1381 ZFCP_DID_DIRECTORY_SERVICE);
1382 if (!port) {
1383 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1384 "adapter %s failed\n",
1385 zfcp_get_busid_by_adapter(adapter));
1386 return -ENXIO;
1387 }
1388 zfcp_port_put(port);
1389
1390 return 0;
1391 }
1392
1393 #undef ZFCP_LOG_AREA
1394
1395 /****************************************************************/
1396 /******* Fibre Channel Standard related Functions **************/
1397 /****************************************************************/
1398
1399 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1400
1401 void
1402 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1403 struct fsf_status_read_buffer *status_buffer)
1404 {
1405 struct fcp_rscn_head *fcp_rscn_head;
1406 struct fcp_rscn_element *fcp_rscn_element;
1407 struct zfcp_port *port;
1408 u16 i;
1409 u16 no_entries;
1410 u32 range_mask;
1411 unsigned long flags;
1412
1413 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1414 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1415
1416 /* see FC-FS */
1417 no_entries = (fcp_rscn_head->payload_len / 4);
1418
1419 for (i = 1; i < no_entries; i++) {
1420 /* skip head and start with 1st element */
1421 fcp_rscn_element++;
1422 switch (fcp_rscn_element->addr_format) {
1423 case ZFCP_PORT_ADDRESS:
1424 range_mask = ZFCP_PORTS_RANGE_PORT;
1425 break;
1426 case ZFCP_AREA_ADDRESS:
1427 range_mask = ZFCP_PORTS_RANGE_AREA;
1428 break;
1429 case ZFCP_DOMAIN_ADDRESS:
1430 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1431 break;
1432 case ZFCP_FABRIC_ADDRESS:
1433 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1434 break;
1435 default:
1436 ZFCP_LOG_INFO("incoming RSCN with unknown "
1437 "address format\n");
1438 continue;
1439 }
1440 read_lock_irqsave(&zfcp_data.config_lock, flags);
1441 list_for_each_entry(port, &adapter->port_list_head, list) {
1442 if (atomic_test_mask
1443 (ZFCP_STATUS_PORT_WKA, &port->status))
1444 continue;
1445 /* Do we know this port? If not skip it. */
1446 if (!atomic_test_mask
1447 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1448 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1449 "port 0x%016Lx\n", port->wwpn);
1450 zfcp_erp_port_reopen(port,
1451 ZFCP_STATUS_COMMON_ERP_FAILED);
1452 continue;
1453 }
1454
1455 /*
1456 * FIXME: race: d_id might being invalidated
1457 * (...DID_DID reset)
1458 */
1459 if ((port->d_id & range_mask)
1460 == (fcp_rscn_element->nport_did & range_mask)) {
1461 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1462 fcp_rscn_element->nport_did);
1463 /*
1464 * Unfortunately, an RSCN does not specify the
1465 * type of change a target underwent. We assume
1466 * that it makes sense to reopen the link.
1467 * FIXME: Shall we try to find out more about
1468 * the target and link state before closing it?
1469 * How to accomplish this? (nameserver?)
1470 * Where would such code be put in?
1471 * (inside or outside erp)
1472 */
1473 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1474 "port 0x%016Lx\n", port->wwpn);
1475 zfcp_test_link(port);
1476 }
1477 }
1478 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1479 }
1480 }
1481
1482 static void
1483 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1484 struct fsf_status_read_buffer *status_buffer)
1485 {
1486 struct fsf_plogi *els_plogi;
1487 struct zfcp_port *port;
1488 unsigned long flags;
1489
1490 els_plogi = (struct fsf_plogi *) status_buffer->payload;
1491 read_lock_irqsave(&zfcp_data.config_lock, flags);
1492 list_for_each_entry(port, &adapter->port_list_head, list) {
1493 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1494 break;
1495 }
1496 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1497
1498 if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1499 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1500 "with d_id 0x%08x on adapter %s\n",
1501 status_buffer->d_id,
1502 zfcp_get_busid_by_adapter(adapter));
1503 } else {
1504 zfcp_erp_port_forced_reopen(port, 0);
1505 }
1506 }
1507
1508 static void
1509 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1510 struct fsf_status_read_buffer *status_buffer)
1511 {
1512 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1513 struct zfcp_port *port;
1514 unsigned long flags;
1515
1516 read_lock_irqsave(&zfcp_data.config_lock, flags);
1517 list_for_each_entry(port, &adapter->port_list_head, list) {
1518 if (port->wwpn == els_logo->nport_wwpn)
1519 break;
1520 }
1521 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1522
1523 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1524 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1525 "with d_id 0x%08x on adapter %s\n",
1526 status_buffer->d_id,
1527 zfcp_get_busid_by_adapter(adapter));
1528 } else {
1529 zfcp_erp_port_forced_reopen(port, 0);
1530 }
1531 }
1532
1533 static void
1534 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1535 struct fsf_status_read_buffer *status_buffer)
1536 {
1537 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1538 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1539 zfcp_get_busid_by_adapter(adapter));
1540
1541 }
1542
1543 void
1544 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1545 {
1546 struct fsf_status_read_buffer *status_buffer;
1547 u32 els_type;
1548 struct zfcp_adapter *adapter;
1549
1550 status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1551 els_type = *(u32 *) (status_buffer->payload);
1552 adapter = fsf_req->adapter;
1553
1554 zfcp_san_dbf_event_incoming_els(fsf_req);
1555 if (els_type == LS_PLOGI)
1556 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1557 else if (els_type == LS_LOGO)
1558 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1559 else if ((els_type & 0xffff0000) == LS_RSCN)
1560 /* we are only concerned with the command, not the length */
1561 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1562 else
1563 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1564 }
1565
1566
1567 /**
1568 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1569 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1570 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1571 */
1572 static int
1573 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1574 {
1575 struct zfcp_gid_pn_data *data;
1576
1577 if (pool != NULL) {
1578 data = mempool_alloc(pool, GFP_ATOMIC);
1579 if (likely(data != NULL)) {
1580 data->ct.pool = pool;
1581 }
1582 } else {
1583 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1584 }
1585
1586 if (NULL == data)
1587 return -ENOMEM;
1588
1589 memset(data, 0, sizeof(*data));
1590 data->ct.req = &data->req;
1591 data->ct.resp = &data->resp;
1592 data->ct.req_count = data->ct.resp_count = 1;
1593 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1594 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1595 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1596 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1597
1598 *gid_pn = data;
1599 return 0;
1600 }
1601
1602 /**
1603 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1604 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1605 */
1606 static void
1607 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1608 {
1609 if ((gid_pn->ct.pool != 0))
1610 mempool_free(gid_pn, gid_pn->ct.pool);
1611 else
1612 kfree(gid_pn);
1613
1614 return;
1615 }
1616
1617 /**
1618 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1619 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1620 */
1621 int
1622 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1623 {
1624 int ret;
1625 struct ct_iu_gid_pn_req *ct_iu_req;
1626 struct zfcp_gid_pn_data *gid_pn;
1627 struct zfcp_adapter *adapter = erp_action->adapter;
1628
1629 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1630 if (ret < 0) {
1631 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1632 "request failed for adapter %s\n",
1633 zfcp_get_busid_by_adapter(adapter));
1634 goto out;
1635 }
1636
1637 /* setup nameserver request */
1638 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1639 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1640 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1641 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1642 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1643 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1644 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1645 ct_iu_req->wwpn = erp_action->port->wwpn;
1646
1647 /* setup parameters for send generic command */
1648 gid_pn->ct.port = adapter->nameserver_port;
1649 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1650 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1651 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1652 gid_pn->ct.timer = &erp_action->timer;
1653 gid_pn->port = erp_action->port;
1654
1655 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1656 erp_action);
1657 if (ret) {
1658 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1659 "failed for adapter %s\n",
1660 zfcp_get_busid_by_adapter(adapter));
1661
1662 zfcp_gid_pn_buffers_free(gid_pn);
1663 }
1664
1665 out:
1666 return ret;
1667 }
1668
1669 /**
1670 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1671 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1672 */
1673 static void zfcp_ns_gid_pn_handler(unsigned long data)
1674 {
1675 struct zfcp_port *port;
1676 struct zfcp_send_ct *ct;
1677 struct ct_iu_gid_pn_req *ct_iu_req;
1678 struct ct_iu_gid_pn_resp *ct_iu_resp;
1679 struct zfcp_gid_pn_data *gid_pn;
1680
1681
1682 gid_pn = (struct zfcp_gid_pn_data *) data;
1683 port = gid_pn->port;
1684 ct = &gid_pn->ct;
1685 ct_iu_req = zfcp_sg_to_address(ct->req);
1686 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1687
1688 if (ct->status != 0)
1689 goto failed;
1690
1691 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1692 /* FIXME: do we need some specific erp entry points */
1693 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1694 goto failed;
1695 }
1696 /* paranoia */
1697 if (ct_iu_req->wwpn != port->wwpn) {
1698 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1699 "lookup does not match expected wwpn 0x%016Lx "
1700 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1701 zfcp_get_busid_by_port(port));
1702 goto mismatch;
1703 }
1704
1705 /* looks like a valid d_id */
1706 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1707 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1708 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1709 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1710 goto out;
1711
1712 mismatch:
1713 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1714 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1715 sizeof(struct ct_iu_gid_pn_req));
1716 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1717 sizeof(struct ct_iu_gid_pn_resp));
1718
1719 failed:
1720 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1721 "0x%016Lx for adapter %s\n",
1722 port->wwpn, zfcp_get_busid_by_port(port));
1723 out:
1724 zfcp_gid_pn_buffers_free(gid_pn);
1725 return;
1726 }
1727
1728 /* reject CT_IU reason codes acc. to FC-GS-4 */
1729 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1730 {0x01, "invalid command code"},
1731 {0x02, "invalid version level"},
1732 {0x03, "logical error"},
1733 {0x04, "invalid CT_IU size"},
1734 {0x05, "logical busy"},
1735 {0x07, "protocol error"},
1736 {0x09, "unable to perform command request"},
1737 {0x0b, "command not supported"},
1738 {0x0d, "server not available"},
1739 {0x0e, "session could not be established"},
1740 {0xff, "vendor specific error"},
1741 {0, NULL},
1742 };
1743
1744 /* LS_RJT reason codes acc. to FC-FS */
1745 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1746 {0x01, "invalid LS_Command code"},
1747 {0x03, "logical error"},
1748 {0x05, "logical busy"},
1749 {0x07, "protocol error"},
1750 {0x09, "unable to perform command request"},
1751 {0x0b, "command not supported"},
1752 {0x0e, "command already in progress"},
1753 {0xff, "vendor specific error"},
1754 {0, NULL},
1755 };
1756
1757 /* reject reason codes according to FC-PH/FC-FS */
1758 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1759 {0x01, "invalid D_ID"},
1760 {0x02, "invalid S_ID"},
1761 {0x03, "Nx_Port not available, temporary"},
1762 {0x04, "Nx_Port not available, permament"},
1763 {0x05, "class not supported"},
1764 {0x06, "delimiter usage error"},
1765 {0x07, "TYPE not supported"},
1766 {0x08, "invalid Link_Control"},
1767 {0x09, "invalid R_CTL field"},
1768 {0x0a, "invalid F_CTL field"},
1769 {0x0b, "invalid OX_ID"},
1770 {0x0c, "invalid RX_ID"},
1771 {0x0d, "invalid SEQ_ID"},
1772 {0x0e, "invalid DF_CTL"},
1773 {0x0f, "invalid SEQ_CNT"},
1774 {0x10, "invalid parameter field"},
1775 {0x11, "exchange error"},
1776 {0x12, "protocol error"},
1777 {0x13, "incorrect length"},
1778 {0x14, "unsupported ACK"},
1779 {0x15, "class of service not supported by entity at FFFFFE"},
1780 {0x16, "login required"},
1781 {0x17, "excessive sequences attempted"},
1782 {0x18, "unable to establish exchange"},
1783 {0x1a, "fabric path not available"},
1784 {0x1b, "invalid VC_ID (class 4)"},
1785 {0x1c, "invalid CS_CTL field"},
1786 {0x1d, "insufficient resources for VC (class 4)"},
1787 {0x1f, "invalid class of service"},
1788 {0x20, "preemption request rejected"},
1789 {0x21, "preemption not enabled"},
1790 {0x22, "multicast error"},
1791 {0x23, "multicast error terminate"},
1792 {0x24, "process login required"},
1793 {0xff, "vendor specific reject"},
1794 {0, NULL},
1795 };
1796
1797 /**
1798 * zfcp_rc_description - return description for given reaon code
1799 * @code: reason code
1800 * @rc_table: table of reason codes and descriptions
1801 */
1802 static inline const char *
1803 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1804 {
1805 const char *descr = "unknown reason code";
1806
1807 do {
1808 if (code == rc_table->code) {
1809 descr = rc_table->description;
1810 break;
1811 }
1812 rc_table++;
1813 } while (rc_table->code && rc_table->description);
1814
1815 return descr;
1816 }
1817
1818 /**
1819 * zfcp_check_ct_response - evaluate reason code for CT_IU
1820 * @rjt: response payload to an CT_IU request
1821 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1822 */
1823 int
1824 zfcp_check_ct_response(struct ct_hdr *rjt)
1825 {
1826 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1827 return 0;
1828
1829 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1830 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1831 "response code (0x%04hx)\n",
1832 rjt->cmd_rsp_code);
1833 return 1;
1834 }
1835
1836 ZFCP_LOG_INFO("Generic Service command rejected\n");
1837 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1838 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1839 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1840 (u32) rjt->vendor_unique);
1841
1842 return 1;
1843 }
1844
1845 /**
1846 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1847 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1848 * @rc_table: table of reason codes and descriptions
1849 */
1850 static inline void
1851 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1852 const struct zfcp_rc_entry *rc_table)
1853 {
1854 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1855 zfcp_rc_description(rjt_par->reason_code, rc_table),
1856 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1857 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1858 }
1859
1860 /**
1861 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1862 * @sq: status qualifier word
1863 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1864 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1865 */
1866 int
1867 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1868 {
1869 int ret = -EIO;
1870
1871 if (sq == FSF_IOSTAT_NPORT_RJT) {
1872 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1873 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1874 /* invalid d_id */
1875 if (rjt_par->reason_code == 0x01)
1876 ret = -EREMCHG;
1877 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1878 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1879 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1880 /* invalid d_id */
1881 if (rjt_par->reason_code == 0x01)
1882 ret = -EREMCHG;
1883 } else if (sq == FSF_IOSTAT_LS_RJT) {
1884 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1885 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1886 ret = -EREMOTEIO;
1887 } else
1888 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1889
1890 return ret;
1891 }
1892
1893 /**
1894 * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1895 * into zfcp_port structure
1896 * @port: zfcp_port structure
1897 * @plogi: plogi payload
1898 */
1899 void
1900 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1901 {
1902 port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1903 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1904 if (plogi->serv_param.class1_serv_param[0] & 0x80)
1905 port->supported_classes |= FC_COS_CLASS1;
1906 if (plogi->serv_param.class2_serv_param[0] & 0x80)
1907 port->supported_classes |= FC_COS_CLASS2;
1908 if (plogi->serv_param.class3_serv_param[0] & 0x80)
1909 port->supported_classes |= FC_COS_CLASS3;
1910 if (plogi->serv_param.class4_serv_param[0] & 0x80)
1911 port->supported_classes |= FC_COS_CLASS4;
1912 }
1913
1914 #undef ZFCP_LOG_AREA
Linux kernel - Deliverables
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