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[PATCH] W1: w1_netlink: New init/fini netlink callbacks.
[linux-2.6/verdex.git] / drivers / s390 / scsi / zfcp_aux.c
blobbfe3ba73bc0f65310f58caa67e2b46412992d0c1
1 /*
2 *
3 * linux/drivers/s390/scsi/zfcp_aux.c
4 *
5 * FCP adapter driver for IBM eServer zSeries
6 *
7 * (C) Copyright IBM Corp. 2002, 2004
8 *
9 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
10 * Raimund Schroeder <raimund.schroeder@de.ibm.com>
11 * Aron Zeh
12 * Wolfgang Taphorn
13 * Stefan Bader <stefan.bader@de.ibm.com>
14 * Heiko Carstens <heiko.carstens@de.ibm.com>
15 * Andreas Herrmann <aherrman@de.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2, or (at your option)
20 * any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32 #define ZFCP_AUX_REVISION "$Revision: 1.145 $"
33
34 #include "zfcp_ext.h"
35
36 /* accumulated log level (module parameter) */
37 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
38 static char *device;
39 /*********************** FUNCTION PROTOTYPES *********************************/
40
41 /* written against the module interface */
42 static int __init zfcp_module_init(void);
43
44 /* FCP related */
45 static void zfcp_ns_gid_pn_handler(unsigned long);
46
47 /* miscellaneous */
48 static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
49 static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
50 static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
51 void __user *, size_t);
52 static inline int zfcp_sg_list_copy_to_user(void __user *,
53 struct zfcp_sg_list *, size_t);
54
55 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
56
57 #define ZFCP_CFDC_IOC_MAGIC 0xDD
58 #define ZFCP_CFDC_IOC \
59 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
60
61
62 static struct file_operations zfcp_cfdc_fops = {
63 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
64 #ifdef CONFIG_COMPAT
65 .compat_ioctl = zfcp_cfdc_dev_ioctl
66 #endif
67 };
68
69 static struct miscdevice zfcp_cfdc_misc = {
70 .minor = ZFCP_CFDC_DEV_MINOR,
71 .name = ZFCP_CFDC_DEV_NAME,
72 .fops = &zfcp_cfdc_fops
73 };
74
75 /*********************** KERNEL/MODULE PARAMETERS ***************************/
76
77 /* declare driver module init/cleanup functions */
78 module_init(zfcp_module_init);
79
80 MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
81 "Andreas Herrman <aherrman@de.ibm.com>, "
82 "Martin Peschke <mpeschke@de.ibm.com>, "
83 "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
84 "Wolfgang Taphorn <taphorn@de.ibm.com>, "
85 "Aron Zeh <arzeh@de.ibm.com>, "
86 "IBM Deutschland Entwicklung GmbH");
87 MODULE_DESCRIPTION
88 ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
89 MODULE_LICENSE("GPL");
90
91 module_param(device, charp, 0400);
92 MODULE_PARM_DESC(device, "specify initial device");
93
94 module_param(loglevel, uint, 0400);
95 MODULE_PARM_DESC(loglevel,
96 "log levels, 8 nibbles: "
97 "FC ERP QDIO CIO Config FSF SCSI Other, "
98 "levels: 0=none 1=normal 2=devel 3=trace");
99
100 /****************************************************************/
101 /************** Functions without logging ***********************/
102 /****************************************************************/
103
104 void
105 _zfcp_hex_dump(char *addr, int count)
106 {
107 int i;
108 for (i = 0; i < count; i++) {
109 printk("%02x", addr[i]);
110 if ((i % 4) == 3)
111 printk(" ");
112 if ((i % 32) == 31)
113 printk("\n");
114 }
115 if (((i-1) % 32) != 31)
116 printk("\n");
117 }
118
119 /****************************************************************/
120 /************** Uncategorised Functions *************************/
121 /****************************************************************/
122
123 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
124
125 static inline int
126 zfcp_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
132 void
133 zfcp_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 */
166 void
167 zfcp_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
198 void
199 zfcp_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 */
220 static int __init
221 zfcp_device_setup(char *devstr)
222 {
223 char *tmp, *str;
224 size_t len;
225
226 if (!devstr)
227 return 0;
228
229 len = strlen(devstr) + 1;
230 str = (char *) kmalloc(len, GFP_KERNEL);
231 if (!str)
232 goto err_out;
233 memcpy(str, devstr, len);
234
235 tmp = strchr(str, ',');
236 if (!tmp)
237 goto err_out;
238 *tmp++ = '\0';
239 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
240 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
241
242 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
243 if (*tmp++ != ',')
244 goto err_out;
245 if (*tmp == '\0')
246 goto err_out;
247
248 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
249 if (*tmp != '\0')
250 goto err_out;
251 kfree(str);
252 return 1;
253
254 err_out:
255 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
256 kfree(str);
257 return 0;
258 }
259
260 static void __init
261 zfcp_init_device_configure(void)
262 {
263 struct zfcp_adapter *adapter;
264 struct zfcp_port *port;
265 struct zfcp_unit *unit;
266
267 down(&zfcp_data.config_sema);
268 read_lock_irq(&zfcp_data.config_lock);
269 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
270 if (adapter)
271 zfcp_adapter_get(adapter);
272 read_unlock_irq(&zfcp_data.config_lock);
273
274 if (adapter == NULL)
275 goto out_adapter;
276 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
277 if (!port)
278 goto out_port;
279 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
280 if (!unit)
281 goto out_unit;
282 up(&zfcp_data.config_sema);
283 ccw_device_set_online(adapter->ccw_device);
284 zfcp_erp_wait(adapter);
285 down(&zfcp_data.config_sema);
286 zfcp_unit_put(unit);
287 out_unit:
288 zfcp_port_put(port);
289 out_port:
290 zfcp_adapter_put(adapter);
291 out_adapter:
292 up(&zfcp_data.config_sema);
293 return;
294 }
295
296 static int __init
297 zfcp_module_init(void)
298 {
299
300 int retval = 0;
301
302 atomic_set(&zfcp_data.loglevel, loglevel);
303
304 /* initialize adapter list */
305 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
306
307 /* initialize adapters to be removed list head */
308 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
309
310 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
311 if (!zfcp_transport_template)
312 return -ENODEV;
313
314 retval = misc_register(&zfcp_cfdc_misc);
315 if (retval != 0) {
316 ZFCP_LOG_INFO("registration of misc device "
317 "zfcp_cfdc failed\n");
318 goto out;
319 }
320
321 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
322 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
323
324 /* Initialise proc semaphores */
325 sema_init(&zfcp_data.config_sema, 1);
326
327 /* initialise configuration rw lock */
328 rwlock_init(&zfcp_data.config_lock);
329
330 /* save address of data structure managing the driver module */
331 zfcp_data.scsi_host_template.module = THIS_MODULE;
332
333 /* setup dynamic I/O */
334 retval = zfcp_ccw_register();
335 if (retval) {
336 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
337 goto out_ccw_register;
338 }
339
340 if (zfcp_device_setup(device))
341 zfcp_init_device_configure();
342
343 goto out;
344
345 out_ccw_register:
346 misc_deregister(&zfcp_cfdc_misc);
347 out:
348 return retval;
349 }
350
351 /*
352 * function: zfcp_cfdc_dev_ioctl
353 *
354 * purpose: Handle control file upload/download transaction via IOCTL
355 * interface
356 *
357 * returns: 0 - Operation completed successfuly
358 * -ENOTTY - Unknown IOCTL command
359 * -EINVAL - Invalid sense data record
360 * -ENXIO - The FCP adapter is not available
361 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
362 * -ENOMEM - Insufficient memory
363 * -EFAULT - User space memory I/O operation fault
364 * -EPERM - Cannot create or queue FSF request or create SBALs
365 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
366 */
367 static long
368 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
369 unsigned long buffer)
370 {
371 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
372 struct zfcp_adapter *adapter = NULL;
373 struct zfcp_fsf_req *fsf_req = NULL;
374 struct zfcp_sg_list *sg_list = NULL;
375 u32 fsf_command, option;
376 char *bus_id = NULL;
377 int retval = 0;
378
379 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
380 if (sense_data == NULL) {
381 retval = -ENOMEM;
382 goto out;
383 }
384
385 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
386 if (sg_list == NULL) {
387 retval = -ENOMEM;
388 goto out;
389 }
390 memset(sg_list, 0, sizeof(*sg_list));
391
392 if (command != ZFCP_CFDC_IOC) {
393 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
394 retval = -ENOTTY;
395 goto out;
396 }
397
398 if ((sense_data_user = (void __user *) buffer) == NULL) {
399 ZFCP_LOG_INFO("sense data record is required\n");
400 retval = -EINVAL;
401 goto out;
402 }
403
404 retval = copy_from_user(sense_data, sense_data_user,
405 sizeof(struct zfcp_cfdc_sense_data));
406 if (retval) {
407 retval = -EFAULT;
408 goto out;
409 }
410
411 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
412 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
413 ZFCP_CFDC_SIGNATURE);
414 retval = -EINVAL;
415 goto out;
416 }
417
418 switch (sense_data->command) {
419
420 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
421 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
422 option = FSF_CFDC_OPTION_NORMAL_MODE;
423 break;
424
425 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
426 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
427 option = FSF_CFDC_OPTION_FORCE;
428 break;
429
430 case ZFCP_CFDC_CMND_FULL_ACCESS:
431 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
432 option = FSF_CFDC_OPTION_FULL_ACCESS;
433 break;
434
435 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
436 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
437 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
438 break;
439
440 case ZFCP_CFDC_CMND_UPLOAD:
441 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
442 option = 0;
443 break;
444
445 default:
446 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
447 sense_data->command);
448 retval = -EINVAL;
449 goto out;
450 }
451
452 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
453 if (bus_id == NULL) {
454 retval = -ENOMEM;
455 goto out;
456 }
457 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
458 (sense_data->devno >> 24),
459 (sense_data->devno >> 16) & 0xFF,
460 (sense_data->devno & 0xFFFF));
461
462 read_lock_irq(&zfcp_data.config_lock);
463 adapter = zfcp_get_adapter_by_busid(bus_id);
464 if (adapter)
465 zfcp_adapter_get(adapter);
466 read_unlock_irq(&zfcp_data.config_lock);
467
468 kfree(bus_id);
469
470 if (adapter == NULL) {
471 ZFCP_LOG_INFO("invalid adapter\n");
472 retval = -ENXIO;
473 goto out;
474 }
475
476 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
477 retval = zfcp_sg_list_alloc(sg_list,
478 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
479 if (retval) {
480 retval = -ENOMEM;
481 goto out;
482 }
483 }
484
485 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
486 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
487 retval = zfcp_sg_list_copy_from_user(
488 sg_list, &sense_data_user->control_file,
489 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
490 if (retval) {
491 retval = -EFAULT;
492 goto out;
493 }
494 }
495
496 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
497 option, sg_list);
498 if (retval)
499 goto out;
500
501 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
502 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
503 retval = -ENXIO;
504 goto out;
505 }
506
507 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
508 memcpy(&sense_data->fsf_status_qual,
509 &fsf_req->qtcb->header.fsf_status_qual,
510 sizeof(union fsf_status_qual));
511 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
512
513 retval = copy_to_user(sense_data_user, sense_data,
514 sizeof(struct zfcp_cfdc_sense_data));
515 if (retval) {
516 retval = -EFAULT;
517 goto out;
518 }
519
520 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
521 retval = zfcp_sg_list_copy_to_user(
522 &sense_data_user->control_file, sg_list,
523 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
524 if (retval) {
525 retval = -EFAULT;
526 goto out;
527 }
528 }
529
530 out:
531 if (fsf_req != NULL)
532 zfcp_fsf_req_free(fsf_req);
533
534 if ((adapter != NULL) && (retval != -ENXIO))
535 zfcp_adapter_put(adapter);
536
537 if (sg_list != NULL) {
538 zfcp_sg_list_free(sg_list);
539 kfree(sg_list);
540 }
541
542 if (sense_data != NULL)
543 kfree(sense_data);
544
545 return retval;
546 }
547
548
549 /**
550 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
551 * @sg_list: structure describing a scatter gather list
552 * @size: size of scatter-gather list
553 * Return: 0 on success, else -ENOMEM
554 *
555 * In sg_list->sg a pointer to the created scatter-gather list is returned,
556 * or NULL if we run out of memory. sg_list->count specifies the number of
557 * elements of the scatter-gather list. The maximum size of a single element
558 * in the scatter-gather list is PAGE_SIZE.
559 */
560 static inline int
561 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
562 {
563 struct scatterlist *sg;
564 unsigned int i;
565 int retval = 0;
566 void *address;
567
568 BUG_ON(sg_list == NULL);
569
570 sg_list->count = size >> PAGE_SHIFT;
571 if (size & ~PAGE_MASK)
572 sg_list->count++;
573 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
574 GFP_KERNEL);
575 if (sg_list->sg == NULL) {
576 sg_list->count = 0;
577 retval = -ENOMEM;
578 goto out;
579 }
580 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
581
582 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
583 sg->length = min(size, PAGE_SIZE);
584 sg->offset = 0;
585 address = (void *) get_zeroed_page(GFP_KERNEL);
586 if (address == NULL) {
587 sg_list->count = i;
588 zfcp_sg_list_free(sg_list);
589 retval = -ENOMEM;
590 goto out;
591 }
592 zfcp_address_to_sg(address, sg);
593 size -= sg->length;
594 }
595
596 out:
597 return retval;
598 }
599
600
601 /**
602 * zfcp_sg_list_free - free memory of a scatter-gather list
603 * @sg_list: structure describing a scatter-gather list
604 *
605 * Memory for each element in the scatter-gather list is freed.
606 * Finally sg_list->sg is freed itself and sg_list->count is reset.
607 */
608 static inline void
609 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
610 {
611 struct scatterlist *sg;
612 unsigned int i;
613
614 BUG_ON(sg_list == NULL);
615
616 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
617 free_page((unsigned long) zfcp_sg_to_address(sg));
618
619 sg_list->count = 0;
620 kfree(sg_list->sg);
621 }
622
623 /**
624 * zfcp_sg_size - determine size of a scatter-gather list
625 * @sg: array of (struct scatterlist)
626 * @sg_count: elements in array
627 * Return: size of entire scatter-gather list
628 */
629 size_t
630 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
631 {
632 unsigned int i;
633 struct scatterlist *p;
634 size_t size;
635
636 size = 0;
637 for (i = 0, p = sg; i < sg_count; i++, p++) {
638 BUG_ON(p == NULL);
639 size += p->length;
640 }
641
642 return size;
643 }
644
645
646 /**
647 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
648 * @sg_list: structure describing a scatter-gather list
649 * @user_buffer: pointer to buffer in user space
650 * @size: number of bytes to be copied
651 * Return: 0 on success, -EFAULT if copy_from_user fails.
652 */
653 static inline int
654 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
655 void __user *user_buffer,
656 size_t size)
657 {
658 struct scatterlist *sg;
659 unsigned int length;
660 void *zfcp_buffer;
661 int retval = 0;
662
663 BUG_ON(sg_list == NULL);
664
665 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
666 return -EFAULT;
667
668 for (sg = sg_list->sg; size > 0; sg++) {
669 length = min((unsigned int)size, sg->length);
670 zfcp_buffer = zfcp_sg_to_address(sg);
671 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
672 retval = -EFAULT;
673 goto out;
674 }
675 user_buffer += length;
676 size -= length;
677 }
678
679 out:
680 return retval;
681 }
682
683
684 /**
685 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
686 * @user_buffer: pointer to buffer in user space
687 * @sg_list: structure describing a scatter-gather list
688 * @size: number of bytes to be copied
689 * Return: 0 on success, -EFAULT if copy_to_user fails
690 */
691 static inline int
692 zfcp_sg_list_copy_to_user(void __user *user_buffer,
693 struct zfcp_sg_list *sg_list,
694 size_t size)
695 {
696 struct scatterlist *sg;
697 unsigned int length;
698 void *zfcp_buffer;
699 int retval = 0;
700
701 BUG_ON(sg_list == NULL);
702
703 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
704 return -EFAULT;
705
706 for (sg = sg_list->sg; size > 0; sg++) {
707 length = min((unsigned int) size, sg->length);
708 zfcp_buffer = zfcp_sg_to_address(sg);
709 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
710 retval = -EFAULT;
711 goto out;
712 }
713 user_buffer += length;
714 size -= length;
715 }
716
717 out:
718 return retval;
719 }
720
721
722 #undef ZFCP_LOG_AREA
723
724 /****************************************************************/
725 /****** Functions for configuration/set-up of structures ********/
726 /****************************************************************/
727
728 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
729
730 /**
731 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
732 * @port: pointer to port to search for unit
733 * @fcp_lun: FCP LUN to search for
734 * Traverse list of all units of a port and return pointer to a unit
735 * with the given FCP LUN.
736 */
737 struct zfcp_unit *
738 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
739 {
740 struct zfcp_unit *unit;
741 int found = 0;
742
743 list_for_each_entry(unit, &port->unit_list_head, list) {
744 if ((unit->fcp_lun == fcp_lun) &&
745 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
746 {
747 found = 1;
748 break;
749 }
750 }
751 return found ? unit : NULL;
752 }
753
754 /**
755 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
756 * @adapter: pointer to adapter to search for port
757 * @wwpn: wwpn to search for
758 * Traverse list of all ports of an adapter and return pointer to a port
759 * with the given wwpn.
760 */
761 struct zfcp_port *
762 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
763 {
764 struct zfcp_port *port;
765 int found = 0;
766
767 list_for_each_entry(port, &adapter->port_list_head, list) {
768 if ((port->wwpn == wwpn) &&
769 !(atomic_read(&port->status) &
770 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
771 found = 1;
772 break;
773 }
774 }
775 return found ? port : NULL;
776 }
777
778 /**
779 * zfcp_get_port_by_did - find port in port list of adapter by d_id
780 * @adapter: pointer to adapter to search for port
781 * @d_id: d_id to search for
782 * Traverse list of all ports of an adapter and return pointer to a port
783 * with the given d_id.
784 */
785 struct zfcp_port *
786 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
787 {
788 struct zfcp_port *port;
789 int found = 0;
790
791 list_for_each_entry(port, &adapter->port_list_head, list) {
792 if ((port->d_id == d_id) &&
793 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
794 {
795 found = 1;
796 break;
797 }
798 }
799 return found ? port : NULL;
800 }
801
802 /**
803 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
804 * @bus_id: bus_id to search for
805 * Traverse list of all adapters and return pointer to an adapter
806 * with the given bus_id.
807 */
808 struct zfcp_adapter *
809 zfcp_get_adapter_by_busid(char *bus_id)
810 {
811 struct zfcp_adapter *adapter;
812 int found = 0;
813
814 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
815 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
816 BUS_ID_SIZE) == 0) &&
817 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
818 &adapter->status)){
819 found = 1;
820 break;
821 }
822 }
823 return found ? adapter : NULL;
824 }
825
826 /**
827 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
828 * @port: pointer to port where unit is added
829 * @fcp_lun: FCP LUN of unit to be enqueued
830 * Return: pointer to enqueued unit on success, NULL on error
831 * Locks: config_sema must be held to serialize changes to the unit list
832 *
833 * Sets up some unit internal structures and creates sysfs entry.
834 */
835 struct zfcp_unit *
836 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
837 {
838 struct zfcp_unit *unit, *tmp_unit;
839 scsi_lun_t scsi_lun;
840 int found;
841
842 /*
843 * check that there is no unit with this FCP_LUN already in list
844 * and enqueue it.
845 * Note: Unlike for the adapter and the port, this is an error
846 */
847 read_lock_irq(&zfcp_data.config_lock);
848 unit = zfcp_get_unit_by_lun(port, fcp_lun);
849 read_unlock_irq(&zfcp_data.config_lock);
850 if (unit)
851 return NULL;
852
853 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
854 if (!unit)
855 return NULL;
856 memset(unit, 0, sizeof (struct zfcp_unit));
857
858 /* initialise reference count stuff */
859 atomic_set(&unit->refcount, 0);
860 init_waitqueue_head(&unit->remove_wq);
861
862 unit->port = port;
863 unit->fcp_lun = fcp_lun;
864
865 /* setup for sysfs registration */
866 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
867 unit->sysfs_device.parent = &port->sysfs_device;
868 unit->sysfs_device.release = zfcp_sysfs_unit_release;
869 dev_set_drvdata(&unit->sysfs_device, unit);
870
871 /* mark unit unusable as long as sysfs registration is not complete */
872 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
873
874 if (device_register(&unit->sysfs_device)) {
875 kfree(unit);
876 return NULL;
877 }
878
879 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
880 device_unregister(&unit->sysfs_device);
881 return NULL;
882 }
883
884 zfcp_unit_get(unit);
885
886 scsi_lun = 0;
887 found = 0;
888 write_lock_irq(&zfcp_data.config_lock);
889 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
890 if (tmp_unit->scsi_lun != scsi_lun) {
891 found = 1;
892 break;
893 }
894 scsi_lun++;
895 }
896 unit->scsi_lun = scsi_lun;
897 if (found)
898 list_add_tail(&unit->list, &tmp_unit->list);
899 else
900 list_add_tail(&unit->list, &port->unit_list_head);
901 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
902 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
903 write_unlock_irq(&zfcp_data.config_lock);
904
905 port->units++;
906 zfcp_port_get(port);
907
908 return unit;
909 }
910
911 void
912 zfcp_unit_dequeue(struct zfcp_unit *unit)
913 {
914 zfcp_unit_wait(unit);
915 write_lock_irq(&zfcp_data.config_lock);
916 list_del(&unit->list);
917 write_unlock_irq(&zfcp_data.config_lock);
918 unit->port->units--;
919 zfcp_port_put(unit->port);
920 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
921 device_unregister(&unit->sysfs_device);
922 }
923
924 static void *
925 zfcp_mempool_alloc(unsigned int __nocast gfp_mask, void *size)
926 {
927 return kmalloc((size_t) size, gfp_mask);
928 }
929
930 static void
931 zfcp_mempool_free(void *element, void *size)
932 {
933 kfree(element);
934 }
935
936 /*
937 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
938 * commands.
939 * It also genrates fcp-nameserver request/response buffer and unsolicited
940 * status read fsf_req buffers.
941 *
942 * locks: must only be called with zfcp_data.config_sema taken
943 */
944 static int
945 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
946 {
947 adapter->pool.fsf_req_erp =
948 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
949 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
950 sizeof(struct zfcp_fsf_req_pool_element));
951
952 if (NULL == adapter->pool.fsf_req_erp)
953 return -ENOMEM;
954
955 adapter->pool.fsf_req_scsi =
956 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
957 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
958 sizeof(struct zfcp_fsf_req_pool_element));
959
960 if (NULL == adapter->pool.fsf_req_scsi)
961 return -ENOMEM;
962
963 adapter->pool.fsf_req_abort =
964 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
965 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
966 sizeof(struct zfcp_fsf_req_pool_element));
967
968 if (NULL == adapter->pool.fsf_req_abort)
969 return -ENOMEM;
970
971 adapter->pool.fsf_req_status_read =
972 mempool_create(ZFCP_POOL_STATUS_READ_NR,
973 zfcp_mempool_alloc, zfcp_mempool_free,
974 (void *) sizeof(struct zfcp_fsf_req));
975
976 if (NULL == adapter->pool.fsf_req_status_read)
977 return -ENOMEM;
978
979 adapter->pool.data_status_read =
980 mempool_create(ZFCP_POOL_STATUS_READ_NR,
981 zfcp_mempool_alloc, zfcp_mempool_free,
982 (void *) sizeof(struct fsf_status_read_buffer));
983
984 if (NULL == adapter->pool.data_status_read)
985 return -ENOMEM;
986
987 adapter->pool.data_gid_pn =
988 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
989 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
990 sizeof(struct zfcp_gid_pn_data));
991
992 if (NULL == adapter->pool.data_gid_pn)
993 return -ENOMEM;
994
995 return 0;
996 }
997
998 /**
999 * zfcp_free_low_mem_buffers - free memory pools of an adapter
1000 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
1001 * locking: zfcp_data.config_sema must be held
1002 */
1003 static void
1004 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1005 {
1006 if (adapter->pool.fsf_req_erp)
1007 mempool_destroy(adapter->pool.fsf_req_erp);
1008 if (adapter->pool.fsf_req_scsi)
1009 mempool_destroy(adapter->pool.fsf_req_scsi);
1010 if (adapter->pool.fsf_req_abort)
1011 mempool_destroy(adapter->pool.fsf_req_abort);
1012 if (adapter->pool.fsf_req_status_read)
1013 mempool_destroy(adapter->pool.fsf_req_status_read);
1014 if (adapter->pool.data_status_read)
1015 mempool_destroy(adapter->pool.data_status_read);
1016 if (adapter->pool.data_gid_pn)
1017 mempool_destroy(adapter->pool.data_gid_pn);
1018 }
1019
1020 /**
1021 * zfcp_adapter_debug_register - registers debug feature for an adapter
1022 * @adapter: pointer to adapter for which debug features should be registered
1023 * return: -ENOMEM on error, 0 otherwise
1024 */
1025 int
1026 zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
1027 {
1028 char dbf_name[20];
1029
1030 /* debug feature area which records SCSI command failures (hostbyte) */
1031 spin_lock_init(&adapter->dbf_lock);
1032
1033 sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
1034 zfcp_get_busid_by_adapter(adapter));
1035 adapter->cmd_dbf = debug_register(dbf_name, ZFCP_CMD_DBF_INDEX,
1036 ZFCP_CMD_DBF_AREAS,
1037 ZFCP_CMD_DBF_LENGTH);
1038 debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
1039 debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
1040
1041 /* debug feature area which records SCSI command aborts */
1042 sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
1043 zfcp_get_busid_by_adapter(adapter));
1044 adapter->abort_dbf = debug_register(dbf_name, ZFCP_ABORT_DBF_INDEX,
1045 ZFCP_ABORT_DBF_AREAS,
1046 ZFCP_ABORT_DBF_LENGTH);
1047 debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
1048 debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
1049
1050 /* debug feature area which records incoming ELS commands */
1051 sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
1052 zfcp_get_busid_by_adapter(adapter));
1053 adapter->in_els_dbf = debug_register(dbf_name, ZFCP_IN_ELS_DBF_INDEX,
1054 ZFCP_IN_ELS_DBF_AREAS,
1055 ZFCP_IN_ELS_DBF_LENGTH);
1056 debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
1057 debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
1058
1059 /* debug feature area which records erp events */
1060 sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
1061 zfcp_get_busid_by_adapter(adapter));
1062 adapter->erp_dbf = debug_register(dbf_name, ZFCP_ERP_DBF_INDEX,
1063 ZFCP_ERP_DBF_AREAS,
1064 ZFCP_ERP_DBF_LENGTH);
1065 debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
1066 debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
1067
1068 if (!(adapter->cmd_dbf && adapter->abort_dbf &&
1069 adapter->in_els_dbf && adapter->erp_dbf)) {
1070 zfcp_adapter_debug_unregister(adapter);
1071 return -ENOMEM;
1072 }
1073
1074 return 0;
1075
1076 }
1077
1078 /**
1079 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
1080 * @adapter: pointer to adapter for which debug features should be unregistered
1081 */
1082 void
1083 zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
1084 {
1085 debug_unregister(adapter->abort_dbf);
1086 debug_unregister(adapter->cmd_dbf);
1087 debug_unregister(adapter->erp_dbf);
1088 debug_unregister(adapter->in_els_dbf);
1089 adapter->abort_dbf = NULL;
1090 adapter->cmd_dbf = NULL;
1091 adapter->erp_dbf = NULL;
1092 adapter->in_els_dbf = NULL;
1093 }
1094
1095 void
1096 zfcp_dummy_release(struct device *dev)
1097 {
1098 return;
1099 }
1100
1101 /*
1102 * Enqueues an adapter at the end of the adapter list in the driver data.
1103 * All adapter internal structures are set up.
1104 * Proc-fs entries are also created.
1105 *
1106 * returns: 0 if a new adapter was successfully enqueued
1107 * ZFCP_KNOWN if an adapter with this devno was already present
1108 * -ENOMEM if alloc failed
1109 * locks: config_sema must be held to serialise changes to the adapter list
1110 */
1111 struct zfcp_adapter *
1112 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1113 {
1114 int retval = 0;
1115 struct zfcp_adapter *adapter;
1116
1117 /*
1118 * Note: It is safe to release the list_lock, as any list changes
1119 * are protected by the config_sema, which must be held to get here
1120 */
1121
1122 /* try to allocate new adapter data structure (zeroed) */
1123 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1124 if (!adapter) {
1125 ZFCP_LOG_INFO("error: allocation of base adapter "
1126 "structure failed\n");
1127 goto out;
1128 }
1129 memset(adapter, 0, sizeof (struct zfcp_adapter));
1130
1131 ccw_device->handler = NULL;
1132
1133 /* save ccw_device pointer */
1134 adapter->ccw_device = ccw_device;
1135
1136 retval = zfcp_qdio_allocate_queues(adapter);
1137 if (retval)
1138 goto queues_alloc_failed;
1139
1140 retval = zfcp_qdio_allocate(adapter);
1141 if (retval)
1142 goto qdio_allocate_failed;
1143
1144 retval = zfcp_allocate_low_mem_buffers(adapter);
1145 if (retval) {
1146 ZFCP_LOG_INFO("error: pool allocation failed\n");
1147 goto failed_low_mem_buffers;
1148 }
1149
1150 /* initialise reference count stuff */
1151 atomic_set(&adapter->refcount, 0);
1152 init_waitqueue_head(&adapter->remove_wq);
1153
1154 /* initialise list of ports */
1155 INIT_LIST_HEAD(&adapter->port_list_head);
1156
1157 /* initialise list of ports to be removed */
1158 INIT_LIST_HEAD(&adapter->port_remove_lh);
1159
1160 /* initialize list of fsf requests */
1161 spin_lock_init(&adapter->fsf_req_list_lock);
1162 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
1163
1164 /* initialize abort lock */
1165 rwlock_init(&adapter->abort_lock);
1166
1167 /* initialise some erp stuff */
1168 init_waitqueue_head(&adapter->erp_thread_wqh);
1169 init_waitqueue_head(&adapter->erp_done_wqh);
1170
1171 /* initialize lock of associated request queue */
1172 rwlock_init(&adapter->request_queue.queue_lock);
1173
1174 /* intitialise SCSI ER timer */
1175 init_timer(&adapter->scsi_er_timer);
1176
1177 /* set FC service class used per default */
1178 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1179
1180 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1181 ASCEBC(adapter->name, strlen(adapter->name));
1182
1183 /* mark adapter unusable as long as sysfs registration is not complete */
1184 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1185
1186 adapter->ccw_device = ccw_device;
1187 dev_set_drvdata(&ccw_device->dev, adapter);
1188
1189 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1190 goto sysfs_failed;
1191
1192 adapter->generic_services.parent = &adapter->ccw_device->dev;
1193 adapter->generic_services.release = zfcp_dummy_release;
1194 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1195 "generic_services");
1196
1197 if (device_register(&adapter->generic_services))
1198 goto generic_services_failed;
1199
1200 /* put allocated adapter at list tail */
1201 write_lock_irq(&zfcp_data.config_lock);
1202 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1203 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1204 write_unlock_irq(&zfcp_data.config_lock);
1205
1206 zfcp_data.adapters++;
1207
1208 goto out;
1209
1210 generic_services_failed:
1211 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1212 sysfs_failed:
1213 dev_set_drvdata(&ccw_device->dev, NULL);
1214 failed_low_mem_buffers:
1215 zfcp_free_low_mem_buffers(adapter);
1216 if (qdio_free(ccw_device) != 0)
1217 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1218 zfcp_get_busid_by_adapter(adapter));
1219 qdio_allocate_failed:
1220 zfcp_qdio_free_queues(adapter);
1221 queues_alloc_failed:
1222 kfree(adapter);
1223 adapter = NULL;
1224 out:
1225 return adapter;
1226 }
1227
1228 /*
1229 * returns: 0 - struct zfcp_adapter data structure successfully removed
1230 * !0 - struct zfcp_adapter data structure could not be removed
1231 * (e.g. still used)
1232 * locks: adapter list write lock is assumed to be held by caller
1233 * adapter->fsf_req_list_lock is taken and released within this
1234 * function and must not be held on entry
1235 */
1236 void
1237 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1238 {
1239 int retval = 0;
1240 unsigned long flags;
1241
1242 device_unregister(&adapter->generic_services);
1243 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1244 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1245 /* sanity check: no pending FSF requests */
1246 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1247 retval = !list_empty(&adapter->fsf_req_list_head);
1248 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1249 if (retval) {
1250 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1251 "%i requests outstanding\n",
1252 zfcp_get_busid_by_adapter(adapter), adapter,
1253 atomic_read(&adapter->fsf_reqs_active));
1254 retval = -EBUSY;
1255 goto out;
1256 }
1257
1258 /* remove specified adapter data structure from list */
1259 write_lock_irq(&zfcp_data.config_lock);
1260 list_del(&adapter->list);
1261 write_unlock_irq(&zfcp_data.config_lock);
1262
1263 /* decrease number of adapters in list */
1264 zfcp_data.adapters--;
1265
1266 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1267 "%i adapters still in list\n",
1268 zfcp_get_busid_by_adapter(adapter),
1269 adapter, zfcp_data.adapters);
1270
1271 retval = qdio_free(adapter->ccw_device);
1272 if (retval)
1273 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1274 zfcp_get_busid_by_adapter(adapter));
1275
1276 zfcp_free_low_mem_buffers(adapter);
1277 /* free memory of adapter data structure and queues */
1278 zfcp_qdio_free_queues(adapter);
1279 ZFCP_LOG_TRACE("freeing adapter structure\n");
1280 kfree(adapter);
1281 out:
1282 return;
1283 }
1284
1285 /**
1286 * zfcp_port_enqueue - enqueue port to port list of adapter
1287 * @adapter: adapter where remote port is added
1288 * @wwpn: WWPN of the remote port to be enqueued
1289 * @status: initial status for the port
1290 * @d_id: destination id of the remote port to be enqueued
1291 * Return: pointer to enqueued port on success, NULL on error
1292 * Locks: config_sema must be held to serialize changes to the port list
1293 *
1294 * All port internal structures are set up and the sysfs entry is generated.
1295 * d_id is used to enqueue ports with a well known address like the Directory
1296 * Service for nameserver lookup.
1297 */
1298 struct zfcp_port *
1299 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1300 u32 d_id)
1301 {
1302 struct zfcp_port *port;
1303 int check_wwpn;
1304
1305 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1306 /*
1307 * check that there is no port with this WWPN already in list
1308 */
1309 if (check_wwpn) {
1310 read_lock_irq(&zfcp_data.config_lock);
1311 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1312 read_unlock_irq(&zfcp_data.config_lock);
1313 if (port)
1314 return NULL;
1315 }
1316
1317 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1318 if (!port)
1319 return NULL;
1320 memset(port, 0, sizeof (struct zfcp_port));
1321
1322 /* initialise reference count stuff */
1323 atomic_set(&port->refcount, 0);
1324 init_waitqueue_head(&port->remove_wq);
1325
1326 INIT_LIST_HEAD(&port->unit_list_head);
1327 INIT_LIST_HEAD(&port->unit_remove_lh);
1328
1329 port->adapter = adapter;
1330
1331 if (check_wwpn)
1332 port->wwpn = wwpn;
1333
1334 atomic_set_mask(status, &port->status);
1335
1336 /* setup for sysfs registration */
1337 if (status & ZFCP_STATUS_PORT_WKA) {
1338 switch (d_id) {
1339 case ZFCP_DID_DIRECTORY_SERVICE:
1340 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1341 "directory");
1342 break;
1343 case ZFCP_DID_MANAGEMENT_SERVICE:
1344 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1345 "management");
1346 break;
1347 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1348 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1349 "key_distribution");
1350 break;
1351 case ZFCP_DID_ALIAS_SERVICE:
1352 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1353 "alias");
1354 break;
1355 case ZFCP_DID_TIME_SERVICE:
1356 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1357 "time");
1358 break;
1359 default:
1360 kfree(port);
1361 return NULL;
1362 }
1363 port->d_id = d_id;
1364 port->sysfs_device.parent = &adapter->generic_services;
1365 } else {
1366 snprintf(port->sysfs_device.bus_id,
1367 BUS_ID_SIZE, "0x%016llx", wwpn);
1368 port->sysfs_device.parent = &adapter->ccw_device->dev;
1369 }
1370 port->sysfs_device.release = zfcp_sysfs_port_release;
1371 dev_set_drvdata(&port->sysfs_device, port);
1372
1373 /* mark port unusable as long as sysfs registration is not complete */
1374 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1375
1376 if (device_register(&port->sysfs_device)) {
1377 kfree(port);
1378 return NULL;
1379 }
1380
1381 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1382 device_unregister(&port->sysfs_device);
1383 return NULL;
1384 }
1385
1386 zfcp_port_get(port);
1387
1388 write_lock_irq(&zfcp_data.config_lock);
1389 list_add_tail(&port->list, &adapter->port_list_head);
1390 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1391 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1392 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1393 if (!adapter->nameserver_port)
1394 adapter->nameserver_port = port;
1395 adapter->ports++;
1396 write_unlock_irq(&zfcp_data.config_lock);
1397
1398 zfcp_adapter_get(adapter);
1399
1400 return port;
1401 }
1402
1403 void
1404 zfcp_port_dequeue(struct zfcp_port *port)
1405 {
1406 zfcp_port_wait(port);
1407 write_lock_irq(&zfcp_data.config_lock);
1408 list_del(&port->list);
1409 port->adapter->ports--;
1410 write_unlock_irq(&zfcp_data.config_lock);
1411 if (port->rport)
1412 fc_remote_port_delete(port->rport);
1413 port->rport = NULL;
1414 zfcp_adapter_put(port->adapter);
1415 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1416 atomic_read(&port->status));
1417 device_unregister(&port->sysfs_device);
1418 }
1419
1420 /* Enqueues a nameserver port */
1421 int
1422 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1423 {
1424 struct zfcp_port *port;
1425
1426 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1427 ZFCP_DID_DIRECTORY_SERVICE);
1428 if (!port) {
1429 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1430 "adapter %s failed\n",
1431 zfcp_get_busid_by_adapter(adapter));
1432 return -ENXIO;
1433 }
1434 zfcp_port_put(port);
1435
1436 return 0;
1437 }
1438
1439 #undef ZFCP_LOG_AREA
1440
1441 /****************************************************************/
1442 /******* Fibre Channel Standard related Functions **************/
1443 /****************************************************************/
1444
1445 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1446
1447 void
1448 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1449 struct fsf_status_read_buffer *status_buffer)
1450 {
1451 struct fcp_rscn_head *fcp_rscn_head;
1452 struct fcp_rscn_element *fcp_rscn_element;
1453 struct zfcp_port *port;
1454 u16 i;
1455 u16 no_entries;
1456 u32 range_mask;
1457 unsigned long flags;
1458
1459 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1460 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1461
1462 /* see FC-FS */
1463 no_entries = (fcp_rscn_head->payload_len / 4);
1464
1465 zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
1466 fcp_rscn_head->payload_len);
1467
1468 debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
1469 for (i = 1; i < no_entries; i++) {
1470 /* skip head and start with 1st element */
1471 fcp_rscn_element++;
1472 switch (fcp_rscn_element->addr_format) {
1473 case ZFCP_PORT_ADDRESS:
1474 range_mask = ZFCP_PORTS_RANGE_PORT;
1475 break;
1476 case ZFCP_AREA_ADDRESS:
1477 range_mask = ZFCP_PORTS_RANGE_AREA;
1478 break;
1479 case ZFCP_DOMAIN_ADDRESS:
1480 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1481 break;
1482 case ZFCP_FABRIC_ADDRESS:
1483 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1484 break;
1485 default:
1486 ZFCP_LOG_INFO("incoming RSCN with unknown "
1487 "address format\n");
1488 continue;
1489 }
1490 read_lock_irqsave(&zfcp_data.config_lock, flags);
1491 list_for_each_entry(port, &adapter->port_list_head, list) {
1492 if (atomic_test_mask
1493 (ZFCP_STATUS_PORT_WKA, &port->status))
1494 continue;
1495 /* Do we know this port? If not skip it. */
1496 if (!atomic_test_mask
1497 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1498 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1499 "port 0x%016Lx\n", port->wwpn);
1500 debug_text_event(adapter->erp_dbf, 1,
1501 "unsol_els_rscnu:");
1502 zfcp_erp_port_reopen(port,
1503 ZFCP_STATUS_COMMON_ERP_FAILED);
1504 continue;
1505 }
1506
1507 /*
1508 * FIXME: race: d_id might being invalidated
1509 * (...DID_DID reset)
1510 */
1511 if ((port->d_id & range_mask)
1512 == (fcp_rscn_element->nport_did & range_mask)) {
1513 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1514 fcp_rscn_element->nport_did);
1515 /*
1516 * Unfortunately, an RSCN does not specify the
1517 * type of change a target underwent. We assume
1518 * that it makes sense to reopen the link.
1519 * FIXME: Shall we try to find out more about
1520 * the target and link state before closing it?
1521 * How to accomplish this? (nameserver?)
1522 * Where would such code be put in?
1523 * (inside or outside erp)
1524 */
1525 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1526 "port 0x%016Lx\n", port->wwpn);
1527 debug_text_event(adapter->erp_dbf, 1,
1528 "unsol_els_rscnk:");
1529 zfcp_test_link(port);
1530 }
1531 }
1532 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1533 }
1534 }
1535
1536 static void
1537 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1538 struct fsf_status_read_buffer *status_buffer)
1539 {
1540 logi *els_logi = (logi *) status_buffer->payload;
1541 struct zfcp_port *port;
1542 unsigned long flags;
1543
1544 zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
1545
1546 read_lock_irqsave(&zfcp_data.config_lock, flags);
1547 list_for_each_entry(port, &adapter->port_list_head, list) {
1548 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1549 break;
1550 }
1551 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1552
1553 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1554 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1555 "with d_id 0x%08x on adapter %s\n",
1556 status_buffer->d_id,
1557 zfcp_get_busid_by_adapter(adapter));
1558 } else {
1559 debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
1560 debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
1561 zfcp_erp_port_forced_reopen(port, 0);
1562 }
1563 }
1564
1565 static void
1566 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1567 struct fsf_status_read_buffer *status_buffer)
1568 {
1569 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1570 struct zfcp_port *port;
1571 unsigned long flags;
1572
1573 zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
1574
1575 read_lock_irqsave(&zfcp_data.config_lock, flags);
1576 list_for_each_entry(port, &adapter->port_list_head, list) {
1577 if (port->wwpn == els_logo->nport_wwpn)
1578 break;
1579 }
1580 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1581
1582 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1583 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1584 "with d_id 0x%08x on adapter %s\n",
1585 status_buffer->d_id,
1586 zfcp_get_busid_by_adapter(adapter));
1587 } else {
1588 debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
1589 debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
1590 zfcp_erp_port_forced_reopen(port, 0);
1591 }
1592 }
1593
1594 static void
1595 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1596 struct fsf_status_read_buffer *status_buffer)
1597 {
1598 zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
1599 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1600 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1601 zfcp_get_busid_by_adapter(adapter));
1602
1603 }
1604
1605 void
1606 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1607 {
1608 struct fsf_status_read_buffer *status_buffer;
1609 u32 els_type;
1610 struct zfcp_adapter *adapter;
1611
1612 status_buffer = fsf_req->data.status_read.buffer;
1613 els_type = *(u32 *) (status_buffer->payload);
1614 adapter = fsf_req->adapter;
1615
1616 if (els_type == LS_PLOGI)
1617 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1618 else if (els_type == LS_LOGO)
1619 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1620 else if ((els_type & 0xffff0000) == LS_RSCN)
1621 /* we are only concerned with the command, not the length */
1622 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1623 else
1624 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1625 }
1626
1627
1628 /**
1629 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1630 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1631 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1632 */
1633 static int
1634 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1635 {
1636 struct zfcp_gid_pn_data *data;
1637
1638 if (pool != NULL) {
1639 data = mempool_alloc(pool, GFP_ATOMIC);
1640 if (likely(data != NULL)) {
1641 data->ct.pool = pool;
1642 }
1643 } else {
1644 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1645 }
1646
1647 if (NULL == data)
1648 return -ENOMEM;
1649
1650 memset(data, 0, sizeof(*data));
1651 data->ct.req = &data->req;
1652 data->ct.resp = &data->resp;
1653 data->ct.req_count = data->ct.resp_count = 1;
1654 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1655 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1656 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1657 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1658
1659 *gid_pn = data;
1660 return 0;
1661 }
1662
1663 /**
1664 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1665 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1666 */
1667 static void
1668 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1669 {
1670 if ((gid_pn->ct.pool != 0))
1671 mempool_free(gid_pn, gid_pn->ct.pool);
1672 else
1673 kfree(gid_pn);
1674
1675 return;
1676 }
1677
1678 /**
1679 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1680 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1681 */
1682 int
1683 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1684 {
1685 int ret;
1686 struct ct_iu_gid_pn_req *ct_iu_req;
1687 struct zfcp_gid_pn_data *gid_pn;
1688 struct zfcp_adapter *adapter = erp_action->adapter;
1689
1690 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1691 if (ret < 0) {
1692 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1693 "request failed for adapter %s\n",
1694 zfcp_get_busid_by_adapter(adapter));
1695 goto out;
1696 }
1697
1698 /* setup nameserver request */
1699 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1700 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1701 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1702 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1703 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1704 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1705 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1706 ct_iu_req->wwpn = erp_action->port->wwpn;
1707
1708 /* setup parameters for send generic command */
1709 gid_pn->ct.port = adapter->nameserver_port;
1710 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1711 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1712 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1713 gid_pn->ct.timer = &erp_action->timer;
1714 gid_pn->port = erp_action->port;
1715
1716 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1717 erp_action);
1718 if (ret) {
1719 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1720 "failed for adapter %s\n",
1721 zfcp_get_busid_by_adapter(adapter));
1722
1723 zfcp_gid_pn_buffers_free(gid_pn);
1724 }
1725
1726 out:
1727 return ret;
1728 }
1729
1730 /**
1731 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1732 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1733 */
1734 static void zfcp_ns_gid_pn_handler(unsigned long data)
1735 {
1736 struct zfcp_port *port;
1737 struct zfcp_send_ct *ct;
1738 struct ct_iu_gid_pn_req *ct_iu_req;
1739 struct ct_iu_gid_pn_resp *ct_iu_resp;
1740 struct zfcp_gid_pn_data *gid_pn;
1741
1742
1743 gid_pn = (struct zfcp_gid_pn_data *) data;
1744 port = gid_pn->port;
1745 ct = &gid_pn->ct;
1746 ct_iu_req = zfcp_sg_to_address(ct->req);
1747 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1748
1749 if (ct->status != 0)
1750 goto failed;
1751
1752 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1753 /* FIXME: do we need some specific erp entry points */
1754 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1755 goto failed;
1756 }
1757 /* paranoia */
1758 if (ct_iu_req->wwpn != port->wwpn) {
1759 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1760 "lookup does not match expected wwpn 0x%016Lx "
1761 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1762 zfcp_get_busid_by_port(port));
1763 goto mismatch;
1764 }
1765
1766 /* looks like a valid d_id */
1767 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1768 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1769 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1770 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1771 goto out;
1772
1773 mismatch:
1774 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1775 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1776 sizeof(struct ct_iu_gid_pn_req));
1777 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1778 sizeof(struct ct_iu_gid_pn_resp));
1779
1780 failed:
1781 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1782 "0x%016Lx for adapter %s\n",
1783 port->wwpn, zfcp_get_busid_by_port(port));
1784 out:
1785 zfcp_gid_pn_buffers_free(gid_pn);
1786 return;
1787 }
1788
1789 /* reject CT_IU reason codes acc. to FC-GS-4 */
1790 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1791 {0x01, "invalid command code"},
1792 {0x02, "invalid version level"},
1793 {0x03, "logical error"},
1794 {0x04, "invalid CT_IU size"},
1795 {0x05, "logical busy"},
1796 {0x07, "protocol error"},
1797 {0x09, "unable to perform command request"},
1798 {0x0b, "command not supported"},
1799 {0x0d, "server not available"},
1800 {0x0e, "session could not be established"},
1801 {0xff, "vendor specific error"},
1802 {0, NULL},
1803 };
1804
1805 /* LS_RJT reason codes acc. to FC-FS */
1806 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1807 {0x01, "invalid LS_Command code"},
1808 {0x03, "logical error"},
1809 {0x05, "logical busy"},
1810 {0x07, "protocol error"},
1811 {0x09, "unable to perform command request"},
1812 {0x0b, "command not supported"},
1813 {0x0e, "command already in progress"},
1814 {0xff, "vendor specific error"},
1815 {0, NULL},
1816 };
1817
1818 /* reject reason codes according to FC-PH/FC-FS */
1819 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1820 {0x01, "invalid D_ID"},
1821 {0x02, "invalid S_ID"},
1822 {0x03, "Nx_Port not available, temporary"},
1823 {0x04, "Nx_Port not available, permament"},
1824 {0x05, "class not supported"},
1825 {0x06, "delimiter usage error"},
1826 {0x07, "TYPE not supported"},
1827 {0x08, "invalid Link_Control"},
1828 {0x09, "invalid R_CTL field"},
1829 {0x0a, "invalid F_CTL field"},
1830 {0x0b, "invalid OX_ID"},
1831 {0x0c, "invalid RX_ID"},
1832 {0x0d, "invalid SEQ_ID"},
1833 {0x0e, "invalid DF_CTL"},
1834 {0x0f, "invalid SEQ_CNT"},
1835 {0x10, "invalid parameter field"},
1836 {0x11, "exchange error"},
1837 {0x12, "protocol error"},
1838 {0x13, "incorrect length"},
1839 {0x14, "unsupported ACK"},
1840 {0x15, "class of service not supported by entity at FFFFFE"},
1841 {0x16, "login required"},
1842 {0x17, "excessive sequences attempted"},
1843 {0x18, "unable to establish exchange"},
1844 {0x1a, "fabric path not available"},
1845 {0x1b, "invalid VC_ID (class 4)"},
1846 {0x1c, "invalid CS_CTL field"},
1847 {0x1d, "insufficient resources for VC (class 4)"},
1848 {0x1f, "invalid class of service"},
1849 {0x20, "preemption request rejected"},
1850 {0x21, "preemption not enabled"},
1851 {0x22, "multicast error"},
1852 {0x23, "multicast error terminate"},
1853 {0x24, "process login required"},
1854 {0xff, "vendor specific reject"},
1855 {0, NULL},
1856 };
1857
1858 /**
1859 * zfcp_rc_description - return description for given reaon code
1860 * @code: reason code
1861 * @rc_table: table of reason codes and descriptions
1862 */
1863 static inline const char *
1864 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1865 {
1866 const char *descr = "unknown reason code";
1867
1868 do {
1869 if (code == rc_table->code) {
1870 descr = rc_table->description;
1871 break;
1872 }
1873 rc_table++;
1874 } while (rc_table->code && rc_table->description);
1875
1876 return descr;
1877 }
1878
1879 /**
1880 * zfcp_check_ct_response - evaluate reason code for CT_IU
1881 * @rjt: response payload to an CT_IU request
1882 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1883 */
1884 int
1885 zfcp_check_ct_response(struct ct_hdr *rjt)
1886 {
1887 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1888 return 0;
1889
1890 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1891 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1892 "response code (0x%04hx)\n",
1893 rjt->cmd_rsp_code);
1894 return 1;
1895 }
1896
1897 ZFCP_LOG_INFO("Generic Service command rejected\n");
1898 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1899 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1900 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1901 (u32) rjt->vendor_unique);
1902
1903 return 1;
1904 }
1905
1906 /**
1907 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1908 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1909 * @rc_table: table of reason codes and descriptions
1910 */
1911 static inline void
1912 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1913 const struct zfcp_rc_entry *rc_table)
1914 {
1915 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1916 zfcp_rc_description(rjt_par->reason_code, rc_table),
1917 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1918 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1919 }
1920
1921 /**
1922 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1923 * @sq: status qualifier word
1924 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1925 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1926 */
1927 int
1928 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1929 {
1930 int ret = -EIO;
1931
1932 if (sq == FSF_IOSTAT_NPORT_RJT) {
1933 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1934 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1935 /* invalid d_id */
1936 if (rjt_par->reason_code == 0x01)
1937 ret = -EREMCHG;
1938 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1939 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1940 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1941 /* invalid d_id */
1942 if (rjt_par->reason_code == 0x01)
1943 ret = -EREMCHG;
1944 } else if (sq == FSF_IOSTAT_LS_RJT) {
1945 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1946 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1947 ret = -EREMOTEIO;
1948 } else
1949 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1950
1951 return ret;
1952 }
1953
1954 #undef ZFCP_LOG_AREA
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