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[SCSI] zfcp: fix bug during adapter shutdown
[deliverable/linux.git] / drivers / s390 / scsi / zfcp_aux.c
CommitLineData
1da177e4
LT		 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) */
37static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
38static char *device;
39/*********************** FUNCTION PROTOTYPES *********************************/
40
41/* written against the module interface */
42static int __init zfcp_module_init(void);
43
44/* FCP related */
45static void zfcp_ns_gid_pn_handler(unsigned long);
46
47/* miscellaneous */
48static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
49static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
50static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
51 void __user *, size_t);
52static inline int zfcp_sg_list_copy_to_user(void __user *,
53 struct zfcp_sg_list *, size_t);
54
bd6ae2f6 55static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
1da177e4
LT		 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
1da177e4
LT		 61
62static struct file_operations zfcp_cfdc_fops = {
e183b06b 63 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
64#ifdef CONFIG_COMPAT
65 .compat_ioctl = zfcp_cfdc_dev_ioctl
66#endif
1da177e4
LT		 67};
68
69static 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 */
78module_init(zfcp_module_init);
79
80MODULE_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");
87MODULE_DESCRIPTION
88 ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
89MODULE_LICENSE("GPL");
90
6f71d9bc 91module_param(device, charp, 0400);
1da177e4
LT		 92MODULE_PARM_DESC(device, "specify initial device");
93
6f71d9bc 94module_param(loglevel, uint, 0400);
1da177e4
LT		 95MODULE_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
1da177e4
LT		 100/****************************************************************/
101/************** Functions without logging ***********************/
102/****************************************************************/
103
104void
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
125static inline int
126zfcp_fsf_req_is_scsi_cmnd(struct zfcp_fsf_req *fsf_req)
127{
128 return ((fsf_req->fsf_command == FSF_QTCB_FCP_CMND) &&
129 !(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT));
130}
131
132void
133zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
134 void *add_data, int add_length)
135{
136 struct zfcp_adapter *adapter = fsf_req->adapter;
137 struct scsi_cmnd *scsi_cmnd;
138 int level = 3;
139 int i;
140 unsigned long flags;
141
142 spin_lock_irqsave(&adapter->dbf_lock, flags);
143 if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
144 scsi_cmnd = fsf_req->data.send_fcp_command_task.scsi_cmnd;
145 debug_text_event(adapter->cmd_dbf, level, "fsferror");
146 debug_text_event(adapter->cmd_dbf, level, text);
147 debug_event(adapter->cmd_dbf, level, &fsf_req,
148 sizeof (unsigned long));
149 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
150 sizeof (u32));
151 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
152 sizeof (unsigned long));
153 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
154 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
155 for (i = 0; i < add_length; i += ZFCP_CMD_DBF_LENGTH)
156 debug_event(adapter->cmd_dbf,
157 level,
158 (char *) add_data + i,
159 min(ZFCP_CMD_DBF_LENGTH, add_length - i));
160 }
161 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
162}
163
164/* XXX additionally log unit if available */
165/* ---> introduce new parameter for unit, see 2.4 code */
166void
167zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
168{
169 struct zfcp_adapter *adapter;
170 union zfcp_req_data *req_data;
171 struct zfcp_fsf_req *fsf_req;
172 int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
173 unsigned long flags;
174
175 adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
176 req_data = (union zfcp_req_data *) scsi_cmnd->host_scribble;
177 fsf_req = (req_data ? req_data->send_fcp_command_task.fsf_req : NULL);
178 spin_lock_irqsave(&adapter->dbf_lock, flags);
179 debug_text_event(adapter->cmd_dbf, level, "hostbyte");
180 debug_text_event(adapter->cmd_dbf, level, text);
181 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
182 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
183 sizeof (unsigned long));
184 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
185 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
186 if (likely(fsf_req)) {
187 debug_event(adapter->cmd_dbf, level, &fsf_req,
188 sizeof (unsigned long));
189 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
190 sizeof (u32));
191 } else {
192 debug_text_event(adapter->cmd_dbf, level, "");
193 debug_text_event(adapter->cmd_dbf, level, "");
194 }
195 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
196}
197
198void
199zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
200 struct fsf_status_read_buffer *status_buffer, int length)
201{
202 int level = 1;
203 int i;
204
205 debug_text_event(adapter->in_els_dbf, level, text);
206 debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
207 for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
208 debug_event(adapter->in_els_dbf,
209 level,
210 (char *) status_buffer->payload + i,
211 min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
212}
213
214/**
215 * zfcp_device_setup - setup function
216 * @str: pointer to parameter string
217 *
218 * Parse "device=..." parameter string.
219 */
220static int __init
221zfcp_device_setup(char *str)
222{
223 char *tmp;
224
225 if (!str)
226 return 0;
227
228 tmp = strchr(str, ',');
229 if (!tmp)
230 goto err_out;
231 *tmp++ = '\0';
232 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
233 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
234
235 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
236 if (*tmp++ != ',')
237 goto err_out;
238 if (*tmp == '\0')
239 goto err_out;
240
241 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
242 if (*tmp != '\0')
243 goto err_out;
244 return 1;
245
246 err_out:
247 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
248 return 0;
249}
250
251static void __init
252zfcp_init_device_configure(void)
253{
254 struct zfcp_adapter *adapter;
255 struct zfcp_port *port;
256 struct zfcp_unit *unit;
257
258 down(&zfcp_data.config_sema);
259 read_lock_irq(&zfcp_data.config_lock);
260 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
261 if (adapter)
262 zfcp_adapter_get(adapter);
263 read_unlock_irq(&zfcp_data.config_lock);
264
265 if (adapter == NULL)
266 goto out_adapter;
267 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
268 if (!port)
269 goto out_port;
270 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
271 if (!unit)
272 goto out_unit;
273 up(&zfcp_data.config_sema);
274 ccw_device_set_online(adapter->ccw_device);
275 zfcp_erp_wait(adapter);
276 down(&zfcp_data.config_sema);
277 zfcp_unit_put(unit);
278 out_unit:
279 zfcp_port_put(port);
280 out_port:
281 zfcp_adapter_put(adapter);
282 out_adapter:
283 up(&zfcp_data.config_sema);
284 return;
285}
286
287static int __init
288zfcp_module_init(void)
289{
290
291 int retval = 0;
292
293 atomic_set(&zfcp_data.loglevel, loglevel);
294
295 /* initialize adapter list */
296 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
297
298 /* initialize adapters to be removed list head */
299 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
300
301 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
302 if (!zfcp_transport_template)
303 return -ENODEV;
304
1da177e4
LT		 305 retval = misc_register(&zfcp_cfdc_misc);
306 if (retval != 0) {
307 ZFCP_LOG_INFO("registration of misc device "
308 "zfcp_cfdc failed\n");
e183b06b 309 goto out;
1da177e4
LT		 310 }
311
e183b06b 312 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
313 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
314
1da177e4
LT		 315 /* Initialise proc semaphores */
316 sema_init(&zfcp_data.config_sema, 1);
317
318 /* initialise configuration rw lock */
319 rwlock_init(&zfcp_data.config_lock);
320
321 /* save address of data structure managing the driver module */
322 zfcp_data.scsi_host_template.module = THIS_MODULE;
323
324 /* setup dynamic I/O */
325 retval = zfcp_ccw_register();
326 if (retval) {
327 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
328 goto out_ccw_register;
329 }
330
331 if (zfcp_device_setup(device))
332 zfcp_init_device_configure();
333
334 goto out;
335
336 out_ccw_register:
337 misc_deregister(&zfcp_cfdc_misc);
1da177e4
LT		 338 out:
339 return retval;
340}
341
342/*
343 * function: zfcp_cfdc_dev_ioctl
344 *
345 * purpose: Handle control file upload/download transaction via IOCTL
346 * interface
347 *
348 * returns: 0 - Operation completed successfuly
349 * -ENOTTY - Unknown IOCTL command
350 * -EINVAL - Invalid sense data record
351 * -ENXIO - The FCP adapter is not available
352 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
353 * -ENOMEM - Insufficient memory
354 * -EFAULT - User space memory I/O operation fault
355 * -EPERM - Cannot create or queue FSF request or create SBALs
356 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
357 */
e183b06b 358static long
359zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
360 unsigned long buffer)
1da177e4
LT		 361{
362 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
363 struct zfcp_adapter *adapter = NULL;
364 struct zfcp_fsf_req *fsf_req = NULL;
365 struct zfcp_sg_list *sg_list = NULL;
366 u32 fsf_command, option;
367 char *bus_id = NULL;
368 int retval = 0;
369
370 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
371 if (sense_data == NULL) {
372 retval = -ENOMEM;
373 goto out;
374 }
375
376 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
377 if (sg_list == NULL) {
378 retval = -ENOMEM;
379 goto out;
380 }
381 memset(sg_list, 0, sizeof(*sg_list));
382
383 if (command != ZFCP_CFDC_IOC) {
384 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
385 retval = -ENOTTY;
386 goto out;
387 }
388
389 if ((sense_data_user = (void __user *) buffer) == NULL) {
390 ZFCP_LOG_INFO("sense data record is required\n");
391 retval = -EINVAL;
392 goto out;
393 }
394
395 retval = copy_from_user(sense_data, sense_data_user,
396 sizeof(struct zfcp_cfdc_sense_data));
397 if (retval) {
398 retval = -EFAULT;
399 goto out;
400 }
401
402 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
403 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
404 ZFCP_CFDC_SIGNATURE);
405 retval = -EINVAL;
406 goto out;
407 }
408
409 switch (sense_data->command) {
410
411 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
412 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
413 option = FSF_CFDC_OPTION_NORMAL_MODE;
414 break;
415
416 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
417 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
418 option = FSF_CFDC_OPTION_FORCE;
419 break;
420
421 case ZFCP_CFDC_CMND_FULL_ACCESS:
422 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
423 option = FSF_CFDC_OPTION_FULL_ACCESS;
424 break;
425
426 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
427 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
428 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
429 break;
430
431 case ZFCP_CFDC_CMND_UPLOAD:
432 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
433 option = 0;
434 break;
435
436 default:
437 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
438 sense_data->command);
439 retval = -EINVAL;
440 goto out;
441 }
442
443 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
444 if (bus_id == NULL) {
445 retval = -ENOMEM;
446 goto out;
447 }
448 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
449 (sense_data->devno >> 24),
450 (sense_data->devno >> 16) & 0xFF,
451 (sense_data->devno & 0xFFFF));
452
453 read_lock_irq(&zfcp_data.config_lock);
454 adapter = zfcp_get_adapter_by_busid(bus_id);
455 if (adapter)
456 zfcp_adapter_get(adapter);
457 read_unlock_irq(&zfcp_data.config_lock);
458
459 kfree(bus_id);
460
461 if (adapter == NULL) {
462 ZFCP_LOG_INFO("invalid adapter\n");
463 retval = -ENXIO;
464 goto out;
465 }
466
467 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
468 retval = zfcp_sg_list_alloc(sg_list,
469 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
470 if (retval) {
471 retval = -ENOMEM;
472 goto out;
473 }
474 }
475
476 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
477 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
478 retval = zfcp_sg_list_copy_from_user(
479 sg_list, &sense_data_user->control_file,
480 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
481 if (retval) {
482 retval = -EFAULT;
483 goto out;
484 }
485 }
486
487 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
488 option, sg_list);
489 if (retval)
490 goto out;
491
492 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
493 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
494 retval = -ENXIO;
495 goto out;
496 }
497
498 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
499 memcpy(&sense_data->fsf_status_qual,
500 &fsf_req->qtcb->header.fsf_status_qual,
501 sizeof(union fsf_status_qual));
502 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
503
504 retval = copy_to_user(sense_data_user, sense_data,
505 sizeof(struct zfcp_cfdc_sense_data));
506 if (retval) {
507 retval = -EFAULT;
508 goto out;
509 }
510
511 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
512 retval = zfcp_sg_list_copy_to_user(
513 &sense_data_user->control_file, sg_list,
514 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
515 if (retval) {
516 retval = -EFAULT;
517 goto out;
518 }
519 }
520
521 out:
522 if (fsf_req != NULL)
1db2c9c0 523 zfcp_fsf_req_free(fsf_req);
1da177e4
LT		 524
525 if ((adapter != NULL) && (retval != -ENXIO))
526 zfcp_adapter_put(adapter);
527
528 if (sg_list != NULL) {
529 zfcp_sg_list_free(sg_list);
530 kfree(sg_list);
531 }
532
533 if (sense_data != NULL)
534 kfree(sense_data);
535
536 return retval;
537}
538
539
540/**
541 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
542 * @sg_list: structure describing a scatter gather list
543 * @size: size of scatter-gather list
544 * Return: 0 on success, else -ENOMEM
545 *
546 * In sg_list->sg a pointer to the created scatter-gather list is returned,
547 * or NULL if we run out of memory. sg_list->count specifies the number of
548 * elements of the scatter-gather list. The maximum size of a single element
549 * in the scatter-gather list is PAGE_SIZE.
550 */
551static inline int
552zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
553{
554 struct scatterlist *sg;
555 unsigned int i;
556 int retval = 0;
557 void *address;
558
559 BUG_ON(sg_list == NULL);
560
561 sg_list->count = size >> PAGE_SHIFT;
562 if (size & ~PAGE_MASK)
563 sg_list->count++;
564 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
565 GFP_KERNEL);
566 if (sg_list->sg == NULL) {
567 sg_list->count = 0;
568 retval = -ENOMEM;
569 goto out;
570 }
571 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
572
573 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
574 sg->length = min(size, PAGE_SIZE);
575 sg->offset = 0;
576 address = (void *) get_zeroed_page(GFP_KERNEL);
577 if (address == NULL) {
578 sg_list->count = i;
579 zfcp_sg_list_free(sg_list);
580 retval = -ENOMEM;
581 goto out;
582 }
583 zfcp_address_to_sg(address, sg);
584 size -= sg->length;
585 }
586
587 out:
588 return retval;
589}
590
591
592/**
593 * zfcp_sg_list_free - free memory of a scatter-gather list
594 * @sg_list: structure describing a scatter-gather list
595 *
596 * Memory for each element in the scatter-gather list is freed.
597 * Finally sg_list->sg is freed itself and sg_list->count is reset.
598 */
599static inline void
600zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
601{
602 struct scatterlist *sg;
603 unsigned int i;
604
605 BUG_ON(sg_list == NULL);
606
607 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
608 free_page((unsigned long) zfcp_sg_to_address(sg));
609
610 sg_list->count = 0;
611 kfree(sg_list->sg);
612}
613
614/**
615 * zfcp_sg_size - determine size of a scatter-gather list
616 * @sg: array of (struct scatterlist)
617 * @sg_count: elements in array
618 * Return: size of entire scatter-gather list
619 */
620size_t
621zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
622{
623 unsigned int i;
624 struct scatterlist *p;
625 size_t size;
626
627 size = 0;
628 for (i = 0, p = sg; i < sg_count; i++, p++) {
629 BUG_ON(p == NULL);
630 size += p->length;
631 }
632
633 return size;
634}
635
636
637/**
638 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
639 * @sg_list: structure describing a scatter-gather list
640 * @user_buffer: pointer to buffer in user space
641 * @size: number of bytes to be copied
642 * Return: 0 on success, -EFAULT if copy_from_user fails.
643 */
644static inline int
645zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
646 void __user *user_buffer,
647 size_t size)
648{
649 struct scatterlist *sg;
650 unsigned int length;
651 void *zfcp_buffer;
652 int retval = 0;
653
654 BUG_ON(sg_list == NULL);
655
656 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
657 return -EFAULT;
658
659 for (sg = sg_list->sg; size > 0; sg++) {
660 length = min((unsigned int)size, sg->length);
661 zfcp_buffer = zfcp_sg_to_address(sg);
662 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
663 retval = -EFAULT;
664 goto out;
665 }
666 user_buffer += length;
667 size -= length;
668 }
669
670 out:
671 return retval;
672}
673
674
675/**
676 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
677 * @user_buffer: pointer to buffer in user space
678 * @sg_list: structure describing a scatter-gather list
679 * @size: number of bytes to be copied
680 * Return: 0 on success, -EFAULT if copy_to_user fails
681 */
682static inline int
683zfcp_sg_list_copy_to_user(void __user *user_buffer,
684 struct zfcp_sg_list *sg_list,
685 size_t size)
686{
687 struct scatterlist *sg;
688 unsigned int length;
689 void *zfcp_buffer;
690 int retval = 0;
691
692 BUG_ON(sg_list == NULL);
693
694 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
695 return -EFAULT;
696
697 for (sg = sg_list->sg; size > 0; sg++) {
698 length = min((unsigned int) size, sg->length);
699 zfcp_buffer = zfcp_sg_to_address(sg);
700 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
701 retval = -EFAULT;
702 goto out;
703 }
704 user_buffer += length;
705 size -= length;
706 }
707
708 out:
709 return retval;
710}
711
712
713#undef ZFCP_LOG_AREA
714
715/****************************************************************/
716/****** Functions for configuration/set-up of structures ********/
717/****************************************************************/
718
719#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
720
721/**
722 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
723 * @port: pointer to port to search for unit
724 * @fcp_lun: FCP LUN to search for
725 * Traverse list of all units of a port and return pointer to a unit
726 * with the given FCP LUN.
727 */
728struct zfcp_unit *
729zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
730{
731 struct zfcp_unit *unit;
732 int found = 0;
733
734 list_for_each_entry(unit, &port->unit_list_head, list) {
735 if ((unit->fcp_lun == fcp_lun) &&
736 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
737 {
738 found = 1;
739 break;
740 }
741 }
742 return found ? unit : NULL;
743}
744
745/**
746 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
747 * @adapter: pointer to adapter to search for port
748 * @wwpn: wwpn to search for
749 * Traverse list of all ports of an adapter and return pointer to a port
750 * with the given wwpn.
751 */
752struct zfcp_port *
753zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
754{
755 struct zfcp_port *port;
756 int found = 0;
757
758 list_for_each_entry(port, &adapter->port_list_head, list) {
759 if ((port->wwpn == wwpn) &&
760 !(atomic_read(&port->status) &
761 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
762 found = 1;
763 break;
764 }
765 }
766 return found ? port : NULL;
767}
768
769/**
770 * zfcp_get_port_by_did - find port in port list of adapter by d_id
771 * @adapter: pointer to adapter to search for port
772 * @d_id: d_id to search for
773 * Traverse list of all ports of an adapter and return pointer to a port
774 * with the given d_id.
775 */
776struct zfcp_port *
777zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
778{
779 struct zfcp_port *port;
780 int found = 0;
781
782 list_for_each_entry(port, &adapter->port_list_head, list) {
783 if ((port->d_id == d_id) &&
784 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
785 {
786 found = 1;
787 break;
788 }
789 }
790 return found ? port : NULL;
791}
792
793/**
794 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
795 * @bus_id: bus_id to search for
796 * Traverse list of all adapters and return pointer to an adapter
797 * with the given bus_id.
798 */
799struct zfcp_adapter *
800zfcp_get_adapter_by_busid(char *bus_id)
801{
802 struct zfcp_adapter *adapter;
803 int found = 0;
804
805 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
806 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
807 BUS_ID_SIZE) == 0) &&
808 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
809 &adapter->status)){
810 found = 1;
811 break;
812 }
813 }
814 return found ? adapter : NULL;
815}
816
817/**
818 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
819 * @port: pointer to port where unit is added
820 * @fcp_lun: FCP LUN of unit to be enqueued
821 * Return: pointer to enqueued unit on success, NULL on error
822 * Locks: config_sema must be held to serialize changes to the unit list
823 *
824 * Sets up some unit internal structures and creates sysfs entry.
825 */
826struct zfcp_unit *
827zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
828{
829 struct zfcp_unit *unit, *tmp_unit;
830 scsi_lun_t scsi_lun;
831 int found;
832
833 /*
834 * check that there is no unit with this FCP_LUN already in list
835 * and enqueue it.
836 * Note: Unlike for the adapter and the port, this is an error
837 */
838 read_lock_irq(&zfcp_data.config_lock);
839 unit = zfcp_get_unit_by_lun(port, fcp_lun);
840 read_unlock_irq(&zfcp_data.config_lock);
841 if (unit)
842 return NULL;
843
844 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
845 if (!unit)
846 return NULL;
847 memset(unit, 0, sizeof (struct zfcp_unit));
848
849 /* initialise reference count stuff */
850 atomic_set(&unit->refcount, 0);
851 init_waitqueue_head(&unit->remove_wq);
852
853 unit->port = port;
854 unit->fcp_lun = fcp_lun;
855
856 /* setup for sysfs registration */
857 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
858 unit->sysfs_device.parent = &port->sysfs_device;
859 unit->sysfs_device.release = zfcp_sysfs_unit_release;
860 dev_set_drvdata(&unit->sysfs_device, unit);
861
862 /* mark unit unusable as long as sysfs registration is not complete */
863 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
864
865 if (device_register(&unit->sysfs_device)) {
866 kfree(unit);
867 return NULL;
868 }
869
870 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
871 device_unregister(&unit->sysfs_device);
872 return NULL;
873 }
874
875 zfcp_unit_get(unit);
876
877 scsi_lun = 0;
878 found = 0;
879 write_lock_irq(&zfcp_data.config_lock);
880 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
881 if (tmp_unit->scsi_lun != scsi_lun) {
882 found = 1;
883 break;
884 }
885 scsi_lun++;
886 }
887 unit->scsi_lun = scsi_lun;
888 if (found)
889 list_add_tail(&unit->list, &tmp_unit->list);
890 else
891 list_add_tail(&unit->list, &port->unit_list_head);
892 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
893 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
894 write_unlock_irq(&zfcp_data.config_lock);
895
896 port->units++;
897 zfcp_port_get(port);
898
899 return unit;
900}
901
902void
903zfcp_unit_dequeue(struct zfcp_unit *unit)
904{
905 zfcp_unit_wait(unit);
906 write_lock_irq(&zfcp_data.config_lock);
907 list_del(&unit->list);
908 write_unlock_irq(&zfcp_data.config_lock);
909 unit->port->units--;
910 zfcp_port_put(unit->port);
911 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
912 device_unregister(&unit->sysfs_device);
913}
914
915static void *
916zfcp_mempool_alloc(unsigned int __nocast gfp_mask, void *size)
917{
918 return kmalloc((size_t) size, gfp_mask);
919}
920
921static void
922zfcp_mempool_free(void *element, void *size)
923{
924 kfree(element);
925}
926
927/*
928 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
929 * commands.
930 * It also genrates fcp-nameserver request/response buffer and unsolicited
931 * status read fsf_req buffers.
932 *
933 * locks: must only be called with zfcp_data.config_sema taken
934 */
935static int
936zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
937{
938 adapter->pool.fsf_req_erp =
939 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
940 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
941 sizeof(struct zfcp_fsf_req_pool_element));
942
943 if (NULL == adapter->pool.fsf_req_erp)
944 return -ENOMEM;
945
946 adapter->pool.fsf_req_scsi =
947 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
948 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
949 sizeof(struct zfcp_fsf_req_pool_element));
950
951 if (NULL == adapter->pool.fsf_req_scsi)
952 return -ENOMEM;
953
954 adapter->pool.fsf_req_abort =
955 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
956 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
957 sizeof(struct zfcp_fsf_req_pool_element));
958
959 if (NULL == adapter->pool.fsf_req_abort)
960 return -ENOMEM;
961
962 adapter->pool.fsf_req_status_read =
963 mempool_create(ZFCP_POOL_STATUS_READ_NR,
964 zfcp_mempool_alloc, zfcp_mempool_free,
965 (void *) sizeof(struct zfcp_fsf_req));
966
967 if (NULL == adapter->pool.fsf_req_status_read)
968 return -ENOMEM;
969
970 adapter->pool.data_status_read =
971 mempool_create(ZFCP_POOL_STATUS_READ_NR,
972 zfcp_mempool_alloc, zfcp_mempool_free,
973 (void *) sizeof(struct fsf_status_read_buffer));
974
975 if (NULL == adapter->pool.data_status_read)
976 return -ENOMEM;
977
978 adapter->pool.data_gid_pn =
979 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
980 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
981 sizeof(struct zfcp_gid_pn_data));
982
983 if (NULL == adapter->pool.data_gid_pn)
984 return -ENOMEM;
985
986 return 0;
987}
988
989/**
990 * zfcp_free_low_mem_buffers - free memory pools of an adapter
991 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
992 * locking: zfcp_data.config_sema must be held
993 */
994static void
995zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
996{
997 if (adapter->pool.fsf_req_erp)
998 mempool_destroy(adapter->pool.fsf_req_erp);
999 if (adapter->pool.fsf_req_scsi)
1000 mempool_destroy(adapter->pool.fsf_req_scsi);
1001 if (adapter->pool.fsf_req_abort)
1002 mempool_destroy(adapter->pool.fsf_req_abort);
1003 if (adapter->pool.fsf_req_status_read)
1004 mempool_destroy(adapter->pool.fsf_req_status_read);
1005 if (adapter->pool.data_status_read)
1006 mempool_destroy(adapter->pool.data_status_read);
1007 if (adapter->pool.data_gid_pn)
1008 mempool_destroy(adapter->pool.data_gid_pn);
1009}
1010
1011/**
1012 * zfcp_adapter_debug_register - registers debug feature for an adapter
1013 * @adapter: pointer to adapter for which debug features should be registered
1014 * return: -ENOMEM on error, 0 otherwise
1015 */
1016int
1017zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
1018{
1019 char dbf_name[20];
1020
1021 /* debug feature area which records SCSI command failures (hostbyte) */
1022 spin_lock_init(&adapter->dbf_lock);
1023
1024 sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
1025 zfcp_get_busid_by_adapter(adapter));
1026 adapter->cmd_dbf = debug_register(dbf_name, ZFCP_CMD_DBF_INDEX,
1027 ZFCP_CMD_DBF_AREAS,
1028 ZFCP_CMD_DBF_LENGTH);
1029 debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
1030 debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
1031
1032 /* debug feature area which records SCSI command aborts */
1033 sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
1034 zfcp_get_busid_by_adapter(adapter));
1035 adapter->abort_dbf = debug_register(dbf_name, ZFCP_ABORT_DBF_INDEX,
1036 ZFCP_ABORT_DBF_AREAS,
1037 ZFCP_ABORT_DBF_LENGTH);
1038 debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
1039 debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
1040
1041 /* debug feature area which records incoming ELS commands */
1042 sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
1043 zfcp_get_busid_by_adapter(adapter));
1044 adapter->in_els_dbf = debug_register(dbf_name, ZFCP_IN_ELS_DBF_INDEX,
1045 ZFCP_IN_ELS_DBF_AREAS,
1046 ZFCP_IN_ELS_DBF_LENGTH);
1047 debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
1048 debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
1049
1050 /* debug feature area which records erp events */
1051 sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
1052 zfcp_get_busid_by_adapter(adapter));
1053 adapter->erp_dbf = debug_register(dbf_name, ZFCP_ERP_DBF_INDEX,
1054 ZFCP_ERP_DBF_AREAS,
1055 ZFCP_ERP_DBF_LENGTH);
1056 debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
1057 debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
1058
1059 if (!(adapter->cmd_dbf && adapter->abort_dbf &&
1060 adapter->in_els_dbf && adapter->erp_dbf)) {
1061 zfcp_adapter_debug_unregister(adapter);
1062 return -ENOMEM;
1063 }
1064
1065 return 0;
1066
1067}
1068
1069/**
1070 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
1071 * @adapter: pointer to adapter for which debug features should be unregistered
1072 */
1073void
1074zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
1075{
1076 debug_unregister(adapter->abort_dbf);
1077 debug_unregister(adapter->cmd_dbf);
1078 debug_unregister(adapter->erp_dbf);
1079 debug_unregister(adapter->in_els_dbf);
1080 adapter->abort_dbf = NULL;
1081 adapter->cmd_dbf = NULL;
1082 adapter->erp_dbf = NULL;
1083 adapter->in_els_dbf = NULL;
1084}
1085
1086void
1087zfcp_dummy_release(struct device *dev)
1088{
1089 return;
1090}
1091
1092/*
1093 * Enqueues an adapter at the end of the adapter list in the driver data.
1094 * All adapter internal structures are set up.
1095 * Proc-fs entries are also created.
1096 *
1097 * returns: 0 if a new adapter was successfully enqueued
1098 * ZFCP_KNOWN if an adapter with this devno was already present
1099 * -ENOMEM if alloc failed
1100 * locks: config_sema must be held to serialise changes to the adapter list
1101 */
1102struct zfcp_adapter *
1103zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1104{
1105 int retval = 0;
1106 struct zfcp_adapter *adapter;
1107
1108 /*
1109 * Note: It is safe to release the list_lock, as any list changes
1110 * are protected by the config_sema, which must be held to get here
1111 */
1112
1113 /* try to allocate new adapter data structure (zeroed) */
1114 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1115 if (!adapter) {
1116 ZFCP_LOG_INFO("error: allocation of base adapter "
1117 "structure failed\n");
1118 goto out;
1119 }
1120 memset(adapter, 0, sizeof (struct zfcp_adapter));
1121
1122 ccw_device->handler = NULL;
1123
1124 /* save ccw_device pointer */
1125 adapter->ccw_device = ccw_device;
1126
1127 retval = zfcp_qdio_allocate_queues(adapter);
1128 if (retval)
1129 goto queues_alloc_failed;
1130
1131 retval = zfcp_qdio_allocate(adapter);
1132 if (retval)
1133 goto qdio_allocate_failed;
1134
1135 retval = zfcp_allocate_low_mem_buffers(adapter);
1136 if (retval) {
1137 ZFCP_LOG_INFO("error: pool allocation failed\n");
1138 goto failed_low_mem_buffers;
1139 }
1140
1141 /* initialise reference count stuff */
1142 atomic_set(&adapter->refcount, 0);
1143 init_waitqueue_head(&adapter->remove_wq);
1144
1145 /* initialise list of ports */
1146 INIT_LIST_HEAD(&adapter->port_list_head);
1147
1148 /* initialise list of ports to be removed */
1149 INIT_LIST_HEAD(&adapter->port_remove_lh);
1150
1151 /* initialize list of fsf requests */
1db2c9c0 1152 spin_lock_init(&adapter->fsf_req_list_lock);
1da177e4
LT		 1153 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
1154
1155 /* initialize abort lock */
1156 rwlock_init(&adapter->abort_lock);
1157
1158 /* initialise some erp stuff */
1159 init_waitqueue_head(&adapter->erp_thread_wqh);
1160 init_waitqueue_head(&adapter->erp_done_wqh);
1161
1162 /* initialize lock of associated request queue */
1163 rwlock_init(&adapter->request_queue.queue_lock);
1164
1165 /* intitialise SCSI ER timer */
1166 init_timer(&adapter->scsi_er_timer);
1167
1168 /* set FC service class used per default */
1169 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1170
1171 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1172 ASCEBC(adapter->name, strlen(adapter->name));
1173
1174 /* mark adapter unusable as long as sysfs registration is not complete */
1175 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1176
1177 adapter->ccw_device = ccw_device;
1178 dev_set_drvdata(&ccw_device->dev, adapter);
1179
1180 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1181 goto sysfs_failed;
1182
1183 adapter->generic_services.parent = &adapter->ccw_device->dev;
1184 adapter->generic_services.release = zfcp_dummy_release;
1185 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1186 "generic_services");
1187
1188 if (device_register(&adapter->generic_services))
1189 goto generic_services_failed;
1190
1191 /* put allocated adapter at list tail */
1192 write_lock_irq(&zfcp_data.config_lock);
1193 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1194 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1195 write_unlock_irq(&zfcp_data.config_lock);
1196
1197 zfcp_data.adapters++;
1198
1199 goto out;
1200
1201 generic_services_failed:
1202 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1203 sysfs_failed:
1204 dev_set_drvdata(&ccw_device->dev, NULL);
1205 failed_low_mem_buffers:
1206 zfcp_free_low_mem_buffers(adapter);
1207 if (qdio_free(ccw_device) != 0)
1208 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1209 zfcp_get_busid_by_adapter(adapter));
1210 qdio_allocate_failed:
1211 zfcp_qdio_free_queues(adapter);
1212 queues_alloc_failed:
1213 kfree(adapter);
1214 adapter = NULL;
1215 out:
1216 return adapter;
1217}
1218
1219/*
1220 * returns: 0 - struct zfcp_adapter data structure successfully removed
1221 * !0 - struct zfcp_adapter data structure could not be removed
1222 * (e.g. still used)
1223 * locks: adapter list write lock is assumed to be held by caller
1224 * adapter->fsf_req_list_lock is taken and released within this
1225 * function and must not be held on entry
1226 */
1227void
1228zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1229{
1230 int retval = 0;
1231 unsigned long flags;
1232
1233 device_unregister(&adapter->generic_services);
1234 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1235 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1236 /* sanity check: no pending FSF requests */
1db2c9c0 1237 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1da177e4 1238 retval = !list_empty(&adapter->fsf_req_list_head);
1db2c9c0 1239 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1da177e4
LT		 1240 if (retval) {
1241 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1242 "%i requests outstanding\n",
1243 zfcp_get_busid_by_adapter(adapter), adapter,
1244 atomic_read(&adapter->fsf_reqs_active));
1245 retval = -EBUSY;
1246 goto out;
1247 }
1248
1249 /* remove specified adapter data structure from list */
1250 write_lock_irq(&zfcp_data.config_lock);
1251 list_del(&adapter->list);
1252 write_unlock_irq(&zfcp_data.config_lock);
1253
1254 /* decrease number of adapters in list */
1255 zfcp_data.adapters--;
1256
1257 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1258 "%i adapters still in list\n",
1259 zfcp_get_busid_by_adapter(adapter),
1260 adapter, zfcp_data.adapters);
1261
1262 retval = qdio_free(adapter->ccw_device);
1263 if (retval)
1264 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1265 zfcp_get_busid_by_adapter(adapter));
1266
1267 zfcp_free_low_mem_buffers(adapter);
1268 /* free memory of adapter data structure and queues */
1269 zfcp_qdio_free_queues(adapter);
1270 ZFCP_LOG_TRACE("freeing adapter structure\n");
1271 kfree(adapter);
1272 out:
1273 return;
1274}
1275
1276/**
1277 * zfcp_port_enqueue - enqueue port to port list of adapter
1278 * @adapter: adapter where remote port is added
1279 * @wwpn: WWPN of the remote port to be enqueued
1280 * @status: initial status for the port
1281 * @d_id: destination id of the remote port to be enqueued
1282 * Return: pointer to enqueued port on success, NULL on error
1283 * Locks: config_sema must be held to serialize changes to the port list
1284 *
1285 * All port internal structures are set up and the sysfs entry is generated.
1286 * d_id is used to enqueue ports with a well known address like the Directory
1287 * Service for nameserver lookup.
1288 */
1289struct zfcp_port *
1290zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1291 u32 d_id)
1292{
1293 struct zfcp_port *port, *tmp_port;
1294 int check_wwpn;
1295 scsi_id_t scsi_id;
1296 int found;
1297
1298 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1299
1300 /*
1301 * check that there is no port with this WWPN already in list
1302 */
1303 if (check_wwpn) {
1304 read_lock_irq(&zfcp_data.config_lock);
1305 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1306 read_unlock_irq(&zfcp_data.config_lock);
1307 if (port)
1308 return NULL;
1309 }
1310
1311 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1312 if (!port)
1313 return NULL;
1314 memset(port, 0, sizeof (struct zfcp_port));
1315
1316 /* initialise reference count stuff */
1317 atomic_set(&port->refcount, 0);
1318 init_waitqueue_head(&port->remove_wq);
1319
1320 INIT_LIST_HEAD(&port->unit_list_head);
1321 INIT_LIST_HEAD(&port->unit_remove_lh);
1322
1323 port->adapter = adapter;
1324
1325 if (check_wwpn)
1326 port->wwpn = wwpn;
1327
1328 atomic_set_mask(status, &port->status);
1329
1330 /* setup for sysfs registration */
1331 if (status & ZFCP_STATUS_PORT_WKA) {
1332 switch (d_id) {
1333 case ZFCP_DID_DIRECTORY_SERVICE:
1334 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1335 "directory");
1336 break;
1337 case ZFCP_DID_MANAGEMENT_SERVICE:
1338 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1339 "management");
1340 break;
1341 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1342 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1343 "key_distribution");
1344 break;
1345 case ZFCP_DID_ALIAS_SERVICE:
1346 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1347 "alias");
1348 break;
1349 case ZFCP_DID_TIME_SERVICE:
1350 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1351 "time");
1352 break;
1353 default:
1354 kfree(port);
1355 return NULL;
1356 }
1357 port->d_id = d_id;
1358 port->sysfs_device.parent = &adapter->generic_services;
1359 } else {
1360 snprintf(port->sysfs_device.bus_id,
1361 BUS_ID_SIZE, "0x%016llx", wwpn);
1362 port->sysfs_device.parent = &adapter->ccw_device->dev;
1363 }
1364 port->sysfs_device.release = zfcp_sysfs_port_release;
1365 dev_set_drvdata(&port->sysfs_device, port);
1366
1367 /* mark port unusable as long as sysfs registration is not complete */
1368 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1369
1370 if (device_register(&port->sysfs_device)) {
1371 kfree(port);
1372 return NULL;
1373 }
1374
1375 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1376 device_unregister(&port->sysfs_device);
1377 return NULL;
1378 }
1379
1380 zfcp_port_get(port);
1381
1382 scsi_id = 1;
1383 found = 0;
1384 write_lock_irq(&zfcp_data.config_lock);
1385 list_for_each_entry(tmp_port, &adapter->port_list_head, list) {
1386 if (atomic_test_mask(ZFCP_STATUS_PORT_NO_SCSI_ID,
1387 &tmp_port->status))
1388 continue;
1389 if (tmp_port->scsi_id != scsi_id) {
1390 found = 1;
1391 break;
1392 }
1393 scsi_id++;
1394 }
1395 port->scsi_id = scsi_id;
1396 if (found)
1397 list_add_tail(&port->list, &tmp_port->list);
1398 else
1399 list_add_tail(&port->list, &adapter->port_list_head);
1400 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1401 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1402 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1403 if (!adapter->nameserver_port)
1404 adapter->nameserver_port = port;
1405 adapter->ports++;
1406 write_unlock_irq(&zfcp_data.config_lock);
1407
1408 zfcp_adapter_get(adapter);
1409
1410 return port;
1411}
1412
1413void
1414zfcp_port_dequeue(struct zfcp_port *port)
1415{
1416 zfcp_port_wait(port);
1417 write_lock_irq(&zfcp_data.config_lock);
1418 list_del(&port->list);
1419 port->adapter->ports--;
1420 write_unlock_irq(&zfcp_data.config_lock);
1421 zfcp_adapter_put(port->adapter);
1422 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1423 atomic_read(&port->status));
1424 device_unregister(&port->sysfs_device);
1425}
1426
1427/* Enqueues a nameserver port */
1428int
1429zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1430{
1431 struct zfcp_port *port;
1432
1433 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1434 ZFCP_DID_DIRECTORY_SERVICE);
1435 if (!port) {
1436 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1437 "adapter %s failed\n",
1438 zfcp_get_busid_by_adapter(adapter));
1439 return -ENXIO;
1440 }
1441 zfcp_port_put(port);
1442
1443 return 0;
1444}
1445
1446#undef ZFCP_LOG_AREA
1447
1448/****************************************************************/
1449/******* Fibre Channel Standard related Functions **************/
1450/****************************************************************/
1451
1452#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1453
1454void
1455zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1456 struct fsf_status_read_buffer *status_buffer)
1457{
1458 struct fcp_rscn_head *fcp_rscn_head;
1459 struct fcp_rscn_element *fcp_rscn_element;
1460 struct zfcp_port *port;
1461 u16 i;
1462 u16 no_entries;
1463 u32 range_mask;
1464 unsigned long flags;
1465
1466 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1467 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1468
1469 /* see FC-FS */
1470 no_entries = (fcp_rscn_head->payload_len / 4);
1471
1472 zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
1473 fcp_rscn_head->payload_len);
1474
1475 debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
1476 for (i = 1; i < no_entries; i++) {
1477 /* skip head and start with 1st element */
1478 fcp_rscn_element++;
1479 switch (fcp_rscn_element->addr_format) {
1480 case ZFCP_PORT_ADDRESS:
1da177e4
LT		 1481 range_mask = ZFCP_PORTS_RANGE_PORT;
1482 break;
1483 case ZFCP_AREA_ADDRESS:
1da177e4
LT		 1484 range_mask = ZFCP_PORTS_RANGE_AREA;
1485 break;
1486 case ZFCP_DOMAIN_ADDRESS:
1da177e4
LT		 1487 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1488 break;
1489 case ZFCP_FABRIC_ADDRESS:
1da177e4
LT		 1490 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1491 break;
1492 default:
1493 ZFCP_LOG_INFO("incoming RSCN with unknown "
1494 "address format\n");
1495 continue;
1496 }
1497 read_lock_irqsave(&zfcp_data.config_lock, flags);
1498 list_for_each_entry(port, &adapter->port_list_head, list) {
1499 if (atomic_test_mask
1500 (ZFCP_STATUS_PORT_WKA, &port->status))
1501 continue;
1502 /* Do we know this port? If not skip it. */
1503 if (!atomic_test_mask
1504 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1505 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1506 "port 0x%016Lx\n", port->wwpn);
1507 debug_text_event(adapter->erp_dbf, 1,
1508 "unsol_els_rscnu:");
1509 zfcp_erp_port_reopen(port,
1510 ZFCP_STATUS_COMMON_ERP_FAILED);
1511 continue;
1512 }
1513
1514 /*
1515 * FIXME: race: d_id might being invalidated
1516 * (...DID_DID reset)
1517 */
1518 if ((port->d_id & range_mask)
1519 == (fcp_rscn_element->nport_did & range_mask)) {
1520 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1521 fcp_rscn_element->nport_did);
1522 /*
1523 * Unfortunately, an RSCN does not specify the
1524 * type of change a target underwent. We assume
1525 * that it makes sense to reopen the link.
1526 * FIXME: Shall we try to find out more about
1527 * the target and link state before closing it?
1528 * How to accomplish this? (nameserver?)
1529 * Where would such code be put in?
1530 * (inside or outside erp)
1531 */
1532 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1533 "port 0x%016Lx\n", port->wwpn);
1534 debug_text_event(adapter->erp_dbf, 1,
1535 "unsol_els_rscnk:");
1536 zfcp_test_link(port);
1537 }
1538 }
1539 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1540 }
1541}
1542
1543static void
1544zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1545 struct fsf_status_read_buffer *status_buffer)
1546{
1547 logi *els_logi = (logi *) status_buffer->payload;
1548 struct zfcp_port *port;
1549 unsigned long flags;
1550
1551 zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
1552
1553 read_lock_irqsave(&zfcp_data.config_lock, flags);
1554 list_for_each_entry(port, &adapter->port_list_head, list) {
1555 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1556 break;
1557 }
1558 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1559
1560 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1561 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1562 "with d_id 0x%08x on adapter %s\n",
1563 status_buffer->d_id,
1564 zfcp_get_busid_by_adapter(adapter));
1565 } else {
1566 debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
1567 debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
1568 zfcp_erp_port_forced_reopen(port, 0);
1569 }
1570}
1571
1572static void
1573zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1574 struct fsf_status_read_buffer *status_buffer)
1575{
1576 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1577 struct zfcp_port *port;
1578 unsigned long flags;
1579
1580 zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
1581
1582 read_lock_irqsave(&zfcp_data.config_lock, flags);
1583 list_for_each_entry(port, &adapter->port_list_head, list) {
1584 if (port->wwpn == els_logo->nport_wwpn)
1585 break;
1586 }
1587 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1588
1589 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1590 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1591 "with d_id 0x%08x on adapter %s\n",
1592 status_buffer->d_id,
1593 zfcp_get_busid_by_adapter(adapter));
1594 } else {
1595 debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
1596 debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
1597 zfcp_erp_port_forced_reopen(port, 0);
1598 }
1599}
1600
1601static void
1602zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1603 struct fsf_status_read_buffer *status_buffer)
1604{
1605 zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
1606 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1607 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1608 zfcp_get_busid_by_adapter(adapter));
1609
1610}
1611
1612void
1613zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1614{
1615 struct fsf_status_read_buffer *status_buffer;
1616 u32 els_type;
1617 struct zfcp_adapter *adapter;
1618
1619 status_buffer = fsf_req->data.status_read.buffer;
1620 els_type = *(u32 *) (status_buffer->payload);
1621 adapter = fsf_req->adapter;
1622
1623 if (els_type == LS_PLOGI)
1624 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1625 else if (els_type == LS_LOGO)
1626 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1627 else if ((els_type & 0xffff0000) == LS_RSCN)
1628 /* we are only concerned with the command, not the length */
1629 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1630 else
1631 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1632}
1633
1634
1635/**
1636 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1637 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1638 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1639 */
1640static int
1641zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1642{
1643 struct zfcp_gid_pn_data *data;
1644
1645 if (pool != NULL) {
1646 data = mempool_alloc(pool, GFP_ATOMIC);
1647 if (likely(data != NULL)) {
1648 data->ct.pool = pool;
1649 }
1650 } else {
1651 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1652 }
1653
1654 if (NULL == data)
1655 return -ENOMEM;
1656
1657 memset(data, 0, sizeof(*data));
1658 data->ct.req = &data->req;
1659 data->ct.resp = &data->resp;
1660 data->ct.req_count = data->ct.resp_count = 1;
1661 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1662 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1663 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1664 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1665
1666 *gid_pn = data;
1667 return 0;
1668}
1669
1670/**
1671 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1672 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1673 */
1674static void
1675zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1676{
1677 if ((gid_pn->ct.pool != 0))
1678 mempool_free(gid_pn, gid_pn->ct.pool);
1679 else
1680 kfree(gid_pn);
1681
1682 return;
1683}
1684
1685/**
1686 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1687 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1688 */
1689int
1690zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1691{
1692 int ret;
1693 struct ct_iu_gid_pn_req *ct_iu_req;
1694 struct zfcp_gid_pn_data *gid_pn;
1695 struct zfcp_adapter *adapter = erp_action->adapter;
1696
1697 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1698 if (ret < 0) {
1699 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1700 "request failed for adapter %s\n",
1701 zfcp_get_busid_by_adapter(adapter));
1702 goto out;
1703 }
1704
1705 /* setup nameserver request */
1706 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1707 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1708 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1709 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1710 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1711 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1712 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1713 ct_iu_req->wwpn = erp_action->port->wwpn;
1714
1715 /* setup parameters for send generic command */
1716 gid_pn->ct.port = adapter->nameserver_port;
1717 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1718 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1719 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1720 gid_pn->ct.timer = &erp_action->timer;
1721 gid_pn->port = erp_action->port;
1722
1723 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1724 erp_action);
1725 if (ret) {
1726 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1727 "failed for adapter %s\n",
1728 zfcp_get_busid_by_adapter(adapter));
1729
1730 zfcp_gid_pn_buffers_free(gid_pn);
1731 }
1732
1733 out:
1734 return ret;
1735}
1736
1737/**
1738 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1739 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1740 */
1741static void zfcp_ns_gid_pn_handler(unsigned long data)
1742{
1743 struct zfcp_port *port;
1744 struct zfcp_send_ct *ct;
1745 struct ct_iu_gid_pn_req *ct_iu_req;
1746 struct ct_iu_gid_pn_resp *ct_iu_resp;
1747 struct zfcp_gid_pn_data *gid_pn;
1748
1749
1750 gid_pn = (struct zfcp_gid_pn_data *) data;
1751 port = gid_pn->port;
1752 ct = &gid_pn->ct;
1753 ct_iu_req = zfcp_sg_to_address(ct->req);
1754 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1755
66c8684a
AH		 1756 if (ct->status != 0)
1757 goto failed;
1758
1759 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1da177e4
LT		 1760 /* FIXME: do we need some specific erp entry points */
1761 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1762 goto failed;
1763 }
1764 /* paranoia */
1765 if (ct_iu_req->wwpn != port->wwpn) {
1766 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1767 "lookup does not match expected wwpn 0x%016Lx "
1768 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1769 zfcp_get_busid_by_port(port));
1770 goto mismatch;
1771 }
1772
1773 /* looks like a valid d_id */
1774 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1775 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1776 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1777 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1778 goto out;
1779
1780 mismatch:
1781 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1782 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1783 sizeof(struct ct_iu_gid_pn_req));
1784 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1785 sizeof(struct ct_iu_gid_pn_resp));
1786
1787 failed:
1788 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1789 "0x%016Lx for adapter %s\n",
1790 port->wwpn, zfcp_get_busid_by_port(port));
1791 out:
1792 zfcp_gid_pn_buffers_free(gid_pn);
1793 return;
1794}
1795
1796/* reject CT_IU reason codes acc. to FC-GS-4 */
1797static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1798 {0x01, "invalid command code"},
1799 {0x02, "invalid version level"},
1800 {0x03, "logical error"},
1801 {0x04, "invalid CT_IU size"},
1802 {0x05, "logical busy"},
1803 {0x07, "protocol error"},
1804 {0x09, "unable to perform command request"},
1805 {0x0b, "command not supported"},
1806 {0x0d, "server not available"},
1807 {0x0e, "session could not be established"},
1808 {0xff, "vendor specific error"},
1809 {0, NULL},
1810};
1811
1812/* LS_RJT reason codes acc. to FC-FS */
1813static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1814 {0x01, "invalid LS_Command code"},
1815 {0x03, "logical error"},
1816 {0x05, "logical busy"},
1817 {0x07, "protocol error"},
1818 {0x09, "unable to perform command request"},
1819 {0x0b, "command not supported"},
1820 {0x0e, "command already in progress"},
1821 {0xff, "vendor specific error"},
1822 {0, NULL},
1823};
1824
1825/* reject reason codes according to FC-PH/FC-FS */
1826static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1827 {0x01, "invalid D_ID"},
1828 {0x02, "invalid S_ID"},
1829 {0x03, "Nx_Port not available, temporary"},
1830 {0x04, "Nx_Port not available, permament"},
1831 {0x05, "class not supported"},
1832 {0x06, "delimiter usage error"},
1833 {0x07, "TYPE not supported"},
1834 {0x08, "invalid Link_Control"},
1835 {0x09, "invalid R_CTL field"},
1836 {0x0a, "invalid F_CTL field"},
1837 {0x0b, "invalid OX_ID"},
1838 {0x0c, "invalid RX_ID"},
1839 {0x0d, "invalid SEQ_ID"},
1840 {0x0e, "invalid DF_CTL"},
1841 {0x0f, "invalid SEQ_CNT"},
1842 {0x10, "invalid parameter field"},
1843 {0x11, "exchange error"},
1844 {0x12, "protocol error"},
1845 {0x13, "incorrect length"},
1846 {0x14, "unsupported ACK"},
1847 {0x15, "class of service not supported by entity at FFFFFE"},
1848 {0x16, "login required"},
1849 {0x17, "excessive sequences attempted"},
1850 {0x18, "unable to establish exchange"},
1851 {0x1a, "fabric path not available"},
1852 {0x1b, "invalid VC_ID (class 4)"},
1853 {0x1c, "invalid CS_CTL field"},
1854 {0x1d, "insufficient resources for VC (class 4)"},
1855 {0x1f, "invalid class of service"},
1856 {0x20, "preemption request rejected"},
1857 {0x21, "preemption not enabled"},
1858 {0x22, "multicast error"},
1859 {0x23, "multicast error terminate"},
1860 {0x24, "process login required"},
1861 {0xff, "vendor specific reject"},
1862 {0, NULL},
1863};
1864
1865/**
1866 * zfcp_rc_description - return description for given reaon code
1867 * @code: reason code
1868 * @rc_table: table of reason codes and descriptions
1869 */
1870static inline const char *
1871zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1872{
1873 const char *descr = "unknown reason code";
1874
1875 do {
1876 if (code == rc_table->code) {
1877 descr = rc_table->description;
1878 break;
1879 }
1880 rc_table++;
1881 } while (rc_table->code && rc_table->description);
1882
1883 return descr;
1884}
1885
1886/**
1887 * zfcp_check_ct_response - evaluate reason code for CT_IU
1888 * @rjt: response payload to an CT_IU request
1889 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1890 */
1891int
1892zfcp_check_ct_response(struct ct_hdr *rjt)
1893{
1894 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1895 return 0;
1896
1897 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1898 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1899 "response code (0x%04hx)\n",
1900 rjt->cmd_rsp_code);
1901 return 1;
1902 }
1903
1904 ZFCP_LOG_INFO("Generic Service command rejected\n");
1905 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1906 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1907 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1908 (u32) rjt->vendor_unique);
1909
1910 return 1;
1911}
1912
1913/**
1914 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1915 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1916 * @rc_table: table of reason codes and descriptions
1917 */
1918static inline void
1919zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1920 const struct zfcp_rc_entry *rc_table)
1921{
1922 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1923 zfcp_rc_description(rjt_par->reason_code, rc_table),
1924 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1925 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1926}
1927
1928/**
1929 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1930 * @sq: status qualifier word
1931 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1932 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1933 */
1934int
1935zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1936{
1937 int ret = -EIO;
1938
1939 if (sq == FSF_IOSTAT_NPORT_RJT) {
1940 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1941 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1942 /* invalid d_id */
1943 if (rjt_par->reason_code == 0x01)
1944 ret = -EREMCHG;
1945 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1946 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1947 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1948 /* invalid d_id */
1949 if (rjt_par->reason_code == 0x01)
1950 ret = -EREMCHG;
1951 } else if (sq == FSF_IOSTAT_LS_RJT) {
1952 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1953 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1954 ret = -EREMOTEIO;
1955 } else
1956 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1957
1958 return ret;
1959}
1960
1961#undef ZFCP_LOG_AREA
Linux kernel - Deliverables
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