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[SCSI] zfcp: remove union zfcp_req_data, use unit refcount for FCP commands
[linux-2.6/x86.git] / drivers / s390 / scsi / zfcp_aux.c
blob17f9989238f82070a094fbcee7124d407076aded
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 = (struct scsi_cmnd*) fsf_req->data;
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 struct zfcp_fsf_req *fsf_req;
171 int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
172 unsigned long flags;
173
174 adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
175 fsf_req = (struct zfcp_fsf_req *) scsi_cmnd->host_scribble;
176 spin_lock_irqsave(&adapter->dbf_lock, flags);
177 debug_text_event(adapter->cmd_dbf, level, "hostbyte");
178 debug_text_event(adapter->cmd_dbf, level, text);
179 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
180 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
181 sizeof (unsigned long));
182 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
183 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
184 if (likely(fsf_req)) {
185 debug_event(adapter->cmd_dbf, level, &fsf_req,
186 sizeof (unsigned long));
187 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
188 sizeof (u32));
189 } else {
190 debug_text_event(adapter->cmd_dbf, level, "");
191 debug_text_event(adapter->cmd_dbf, level, "");
192 }
193 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
194 }
195
196 void
197 zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
198 struct fsf_status_read_buffer *status_buffer, int length)
199 {
200 int level = 1;
201 int i;
202
203 debug_text_event(adapter->in_els_dbf, level, text);
204 debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
205 for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
206 debug_event(adapter->in_els_dbf,
207 level,
208 (char *) status_buffer->payload + i,
209 min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
210 }
211
212 /**
213 * zfcp_device_setup - setup function
214 * @str: pointer to parameter string
215 *
216 * Parse "device=..." parameter string.
217 */
218 static int __init
219 zfcp_device_setup(char *devstr)
220 {
221 char *tmp, *str;
222 size_t len;
223
224 if (!devstr)
225 return 0;
226
227 len = strlen(devstr) + 1;
228 str = (char *) kmalloc(len, GFP_KERNEL);
229 if (!str)
230 goto err_out;
231 memcpy(str, devstr, len);
232
233 tmp = strchr(str, ',');
234 if (!tmp)
235 goto err_out;
236 *tmp++ = '\0';
237 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
238 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
239
240 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
241 if (*tmp++ != ',')
242 goto err_out;
243 if (*tmp == '\0')
244 goto err_out;
245
246 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
247 if (*tmp != '\0')
248 goto err_out;
249 kfree(str);
250 return 1;
251
252 err_out:
253 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
254 kfree(str);
255 return 0;
256 }
257
258 static void __init
259 zfcp_init_device_configure(void)
260 {
261 struct zfcp_adapter *adapter;
262 struct zfcp_port *port;
263 struct zfcp_unit *unit;
264
265 down(&zfcp_data.config_sema);
266 read_lock_irq(&zfcp_data.config_lock);
267 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
268 if (adapter)
269 zfcp_adapter_get(adapter);
270 read_unlock_irq(&zfcp_data.config_lock);
271
272 if (adapter == NULL)
273 goto out_adapter;
274 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
275 if (!port)
276 goto out_port;
277 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
278 if (!unit)
279 goto out_unit;
280 up(&zfcp_data.config_sema);
281 ccw_device_set_online(adapter->ccw_device);
282 zfcp_erp_wait(adapter);
283 down(&zfcp_data.config_sema);
284 zfcp_unit_put(unit);
285 out_unit:
286 zfcp_port_put(port);
287 out_port:
288 zfcp_adapter_put(adapter);
289 out_adapter:
290 up(&zfcp_data.config_sema);
291 return;
292 }
293
294 static int __init
295 zfcp_module_init(void)
296 {
297
298 int retval = 0;
299
300 atomic_set(&zfcp_data.loglevel, loglevel);
301
302 /* initialize adapter list */
303 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
304
305 /* initialize adapters to be removed list head */
306 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
307
308 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
309 if (!zfcp_transport_template)
310 return -ENODEV;
311
312 retval = misc_register(&zfcp_cfdc_misc);
313 if (retval != 0) {
314 ZFCP_LOG_INFO("registration of misc device "
315 "zfcp_cfdc failed\n");
316 goto out;
317 }
318
319 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
320 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
321
322 /* Initialise proc semaphores */
323 sema_init(&zfcp_data.config_sema, 1);
324
325 /* initialise configuration rw lock */
326 rwlock_init(&zfcp_data.config_lock);
327
328 /* save address of data structure managing the driver module */
329 zfcp_data.scsi_host_template.module = THIS_MODULE;
330
331 /* setup dynamic I/O */
332 retval = zfcp_ccw_register();
333 if (retval) {
334 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
335 goto out_ccw_register;
336 }
337
338 if (zfcp_device_setup(device))
339 zfcp_init_device_configure();
340
341 goto out;
342
343 out_ccw_register:
344 misc_deregister(&zfcp_cfdc_misc);
345 out:
346 return retval;
347 }
348
349 /*
350 * function: zfcp_cfdc_dev_ioctl
351 *
352 * purpose: Handle control file upload/download transaction via IOCTL
353 * interface
354 *
355 * returns: 0 - Operation completed successfuly
356 * -ENOTTY - Unknown IOCTL command
357 * -EINVAL - Invalid sense data record
358 * -ENXIO - The FCP adapter is not available
359 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
360 * -ENOMEM - Insufficient memory
361 * -EFAULT - User space memory I/O operation fault
362 * -EPERM - Cannot create or queue FSF request or create SBALs
363 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
364 */
365 static long
366 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
367 unsigned long buffer)
368 {
369 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
370 struct zfcp_adapter *adapter = NULL;
371 struct zfcp_fsf_req *fsf_req = NULL;
372 struct zfcp_sg_list *sg_list = NULL;
373 u32 fsf_command, option;
374 char *bus_id = NULL;
375 int retval = 0;
376
377 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
378 if (sense_data == NULL) {
379 retval = -ENOMEM;
380 goto out;
381 }
382
383 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
384 if (sg_list == NULL) {
385 retval = -ENOMEM;
386 goto out;
387 }
388 memset(sg_list, 0, sizeof(*sg_list));
389
390 if (command != ZFCP_CFDC_IOC) {
391 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
392 retval = -ENOTTY;
393 goto out;
394 }
395
396 if ((sense_data_user = (void __user *) buffer) == NULL) {
397 ZFCP_LOG_INFO("sense data record is required\n");
398 retval = -EINVAL;
399 goto out;
400 }
401
402 retval = copy_from_user(sense_data, sense_data_user,
403 sizeof(struct zfcp_cfdc_sense_data));
404 if (retval) {
405 retval = -EFAULT;
406 goto out;
407 }
408
409 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
410 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
411 ZFCP_CFDC_SIGNATURE);
412 retval = -EINVAL;
413 goto out;
414 }
415
416 switch (sense_data->command) {
417
418 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
419 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
420 option = FSF_CFDC_OPTION_NORMAL_MODE;
421 break;
422
423 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
424 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
425 option = FSF_CFDC_OPTION_FORCE;
426 break;
427
428 case ZFCP_CFDC_CMND_FULL_ACCESS:
429 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
430 option = FSF_CFDC_OPTION_FULL_ACCESS;
431 break;
432
433 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
434 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
435 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
436 break;
437
438 case ZFCP_CFDC_CMND_UPLOAD:
439 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
440 option = 0;
441 break;
442
443 default:
444 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
445 sense_data->command);
446 retval = -EINVAL;
447 goto out;
448 }
449
450 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
451 if (bus_id == NULL) {
452 retval = -ENOMEM;
453 goto out;
454 }
455 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
456 (sense_data->devno >> 24),
457 (sense_data->devno >> 16) & 0xFF,
458 (sense_data->devno & 0xFFFF));
459
460 read_lock_irq(&zfcp_data.config_lock);
461 adapter = zfcp_get_adapter_by_busid(bus_id);
462 if (adapter)
463 zfcp_adapter_get(adapter);
464 read_unlock_irq(&zfcp_data.config_lock);
465
466 kfree(bus_id);
467
468 if (adapter == NULL) {
469 ZFCP_LOG_INFO("invalid adapter\n");
470 retval = -ENXIO;
471 goto out;
472 }
473
474 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
475 retval = zfcp_sg_list_alloc(sg_list,
476 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
477 if (retval) {
478 retval = -ENOMEM;
479 goto out;
480 }
481 }
482
483 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
484 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
485 retval = zfcp_sg_list_copy_from_user(
486 sg_list, &sense_data_user->control_file,
487 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
488 if (retval) {
489 retval = -EFAULT;
490 goto out;
491 }
492 }
493
494 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
495 option, sg_list);
496 if (retval)
497 goto out;
498
499 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
500 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
501 retval = -ENXIO;
502 goto out;
503 }
504
505 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
506 memcpy(&sense_data->fsf_status_qual,
507 &fsf_req->qtcb->header.fsf_status_qual,
508 sizeof(union fsf_status_qual));
509 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
510
511 retval = copy_to_user(sense_data_user, sense_data,
512 sizeof(struct zfcp_cfdc_sense_data));
513 if (retval) {
514 retval = -EFAULT;
515 goto out;
516 }
517
518 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
519 retval = zfcp_sg_list_copy_to_user(
520 &sense_data_user->control_file, sg_list,
521 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
522 if (retval) {
523 retval = -EFAULT;
524 goto out;
525 }
526 }
527
528 out:
529 if (fsf_req != NULL)
530 zfcp_fsf_req_free(fsf_req);
531
532 if ((adapter != NULL) && (retval != -ENXIO))
533 zfcp_adapter_put(adapter);
534
535 if (sg_list != NULL) {
536 zfcp_sg_list_free(sg_list);
537 kfree(sg_list);
538 }
539
540 if (sense_data != NULL)
541 kfree(sense_data);
542
543 return retval;
544 }
545
546
547 /**
548 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
549 * @sg_list: structure describing a scatter gather list
550 * @size: size of scatter-gather list
551 * Return: 0 on success, else -ENOMEM
552 *
553 * In sg_list->sg a pointer to the created scatter-gather list is returned,
554 * or NULL if we run out of memory. sg_list->count specifies the number of
555 * elements of the scatter-gather list. The maximum size of a single element
556 * in the scatter-gather list is PAGE_SIZE.
557 */
558 static inline int
559 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
560 {
561 struct scatterlist *sg;
562 unsigned int i;
563 int retval = 0;
564 void *address;
565
566 BUG_ON(sg_list == NULL);
567
568 sg_list->count = size >> PAGE_SHIFT;
569 if (size & ~PAGE_MASK)
570 sg_list->count++;
571 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
572 GFP_KERNEL);
573 if (sg_list->sg == NULL) {
574 sg_list->count = 0;
575 retval = -ENOMEM;
576 goto out;
577 }
578 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
579
580 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
581 sg->length = min(size, PAGE_SIZE);
582 sg->offset = 0;
583 address = (void *) get_zeroed_page(GFP_KERNEL);
584 if (address == NULL) {
585 sg_list->count = i;
586 zfcp_sg_list_free(sg_list);
587 retval = -ENOMEM;
588 goto out;
589 }
590 zfcp_address_to_sg(address, sg);
591 size -= sg->length;
592 }
593
594 out:
595 return retval;
596 }
597
598
599 /**
600 * zfcp_sg_list_free - free memory of a scatter-gather list
601 * @sg_list: structure describing a scatter-gather list
602 *
603 * Memory for each element in the scatter-gather list is freed.
604 * Finally sg_list->sg is freed itself and sg_list->count is reset.
605 */
606 static inline void
607 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
608 {
609 struct scatterlist *sg;
610 unsigned int i;
611
612 BUG_ON(sg_list == NULL);
613
614 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
615 free_page((unsigned long) zfcp_sg_to_address(sg));
616
617 sg_list->count = 0;
618 kfree(sg_list->sg);
619 }
620
621 /**
622 * zfcp_sg_size - determine size of a scatter-gather list
623 * @sg: array of (struct scatterlist)
624 * @sg_count: elements in array
625 * Return: size of entire scatter-gather list
626 */
627 size_t
628 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
629 {
630 unsigned int i;
631 struct scatterlist *p;
632 size_t size;
633
634 size = 0;
635 for (i = 0, p = sg; i < sg_count; i++, p++) {
636 BUG_ON(p == NULL);
637 size += p->length;
638 }
639
640 return size;
641 }
642
643
644 /**
645 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
646 * @sg_list: structure describing a scatter-gather list
647 * @user_buffer: pointer to buffer in user space
648 * @size: number of bytes to be copied
649 * Return: 0 on success, -EFAULT if copy_from_user fails.
650 */
651 static inline int
652 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
653 void __user *user_buffer,
654 size_t size)
655 {
656 struct scatterlist *sg;
657 unsigned int length;
658 void *zfcp_buffer;
659 int retval = 0;
660
661 BUG_ON(sg_list == NULL);
662
663 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
664 return -EFAULT;
665
666 for (sg = sg_list->sg; size > 0; sg++) {
667 length = min((unsigned int)size, sg->length);
668 zfcp_buffer = zfcp_sg_to_address(sg);
669 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
670 retval = -EFAULT;
671 goto out;
672 }
673 user_buffer += length;
674 size -= length;
675 }
676
677 out:
678 return retval;
679 }
680
681
682 /**
683 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
684 * @user_buffer: pointer to buffer in user space
685 * @sg_list: structure describing a scatter-gather list
686 * @size: number of bytes to be copied
687 * Return: 0 on success, -EFAULT if copy_to_user fails
688 */
689 static inline int
690 zfcp_sg_list_copy_to_user(void __user *user_buffer,
691 struct zfcp_sg_list *sg_list,
692 size_t size)
693 {
694 struct scatterlist *sg;
695 unsigned int length;
696 void *zfcp_buffer;
697 int retval = 0;
698
699 BUG_ON(sg_list == NULL);
700
701 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
702 return -EFAULT;
703
704 for (sg = sg_list->sg; size > 0; sg++) {
705 length = min((unsigned int) size, sg->length);
706 zfcp_buffer = zfcp_sg_to_address(sg);
707 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
708 retval = -EFAULT;
709 goto out;
710 }
711 user_buffer += length;
712 size -= length;
713 }
714
715 out:
716 return retval;
717 }
718
719
720 #undef ZFCP_LOG_AREA
721
722 /****************************************************************/
723 /****** Functions for configuration/set-up of structures ********/
724 /****************************************************************/
725
726 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
727
728 /**
729 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
730 * @port: pointer to port to search for unit
731 * @fcp_lun: FCP LUN to search for
732 * Traverse list of all units of a port and return pointer to a unit
733 * with the given FCP LUN.
734 */
735 struct zfcp_unit *
736 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
737 {
738 struct zfcp_unit *unit;
739 int found = 0;
740
741 list_for_each_entry(unit, &port->unit_list_head, list) {
742 if ((unit->fcp_lun == fcp_lun) &&
743 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
744 {
745 found = 1;
746 break;
747 }
748 }
749 return found ? unit : NULL;
750 }
751
752 /**
753 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
754 * @adapter: pointer to adapter to search for port
755 * @wwpn: wwpn to search for
756 * Traverse list of all ports of an adapter and return pointer to a port
757 * with the given wwpn.
758 */
759 struct zfcp_port *
760 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
761 {
762 struct zfcp_port *port;
763 int found = 0;
764
765 list_for_each_entry(port, &adapter->port_list_head, list) {
766 if ((port->wwpn == wwpn) &&
767 !(atomic_read(&port->status) &
768 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
769 found = 1;
770 break;
771 }
772 }
773 return found ? port : NULL;
774 }
775
776 /**
777 * zfcp_get_port_by_did - find port in port list of adapter by d_id
778 * @adapter: pointer to adapter to search for port
779 * @d_id: d_id to search for
780 * Traverse list of all ports of an adapter and return pointer to a port
781 * with the given d_id.
782 */
783 struct zfcp_port *
784 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
785 {
786 struct zfcp_port *port;
787 int found = 0;
788
789 list_for_each_entry(port, &adapter->port_list_head, list) {
790 if ((port->d_id == d_id) &&
791 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
792 {
793 found = 1;
794 break;
795 }
796 }
797 return found ? port : NULL;
798 }
799
800 /**
801 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
802 * @bus_id: bus_id to search for
803 * Traverse list of all adapters and return pointer to an adapter
804 * with the given bus_id.
805 */
806 struct zfcp_adapter *
807 zfcp_get_adapter_by_busid(char *bus_id)
808 {
809 struct zfcp_adapter *adapter;
810 int found = 0;
811
812 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
813 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
814 BUS_ID_SIZE) == 0) &&
815 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
816 &adapter->status)){
817 found = 1;
818 break;
819 }
820 }
821 return found ? adapter : NULL;
822 }
823
824 /**
825 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
826 * @port: pointer to port where unit is added
827 * @fcp_lun: FCP LUN of unit to be enqueued
828 * Return: pointer to enqueued unit on success, NULL on error
829 * Locks: config_sema must be held to serialize changes to the unit list
830 *
831 * Sets up some unit internal structures and creates sysfs entry.
832 */
833 struct zfcp_unit *
834 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
835 {
836 struct zfcp_unit *unit, *tmp_unit;
837 scsi_lun_t scsi_lun;
838 int found;
839
840 /*
841 * check that there is no unit with this FCP_LUN already in list
842 * and enqueue it.
843 * Note: Unlike for the adapter and the port, this is an error
844 */
845 read_lock_irq(&zfcp_data.config_lock);
846 unit = zfcp_get_unit_by_lun(port, fcp_lun);
847 read_unlock_irq(&zfcp_data.config_lock);
848 if (unit)
849 return NULL;
850
851 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
852 if (!unit)
853 return NULL;
854 memset(unit, 0, sizeof (struct zfcp_unit));
855
856 /* initialise reference count stuff */
857 atomic_set(&unit->refcount, 0);
858 init_waitqueue_head(&unit->remove_wq);
859
860 unit->port = port;
861 unit->fcp_lun = fcp_lun;
862
863 /* setup for sysfs registration */
864 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
865 unit->sysfs_device.parent = &port->sysfs_device;
866 unit->sysfs_device.release = zfcp_sysfs_unit_release;
867 dev_set_drvdata(&unit->sysfs_device, unit);
868
869 /* mark unit unusable as long as sysfs registration is not complete */
870 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
871
872 if (device_register(&unit->sysfs_device)) {
873 kfree(unit);
874 return NULL;
875 }
876
877 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
878 device_unregister(&unit->sysfs_device);
879 return NULL;
880 }
881
882 zfcp_unit_get(unit);
883
884 scsi_lun = 0;
885 found = 0;
886 write_lock_irq(&zfcp_data.config_lock);
887 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
888 if (tmp_unit->scsi_lun != scsi_lun) {
889 found = 1;
890 break;
891 }
892 scsi_lun++;
893 }
894 unit->scsi_lun = scsi_lun;
895 if (found)
896 list_add_tail(&unit->list, &tmp_unit->list);
897 else
898 list_add_tail(&unit->list, &port->unit_list_head);
899 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
900 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
901 write_unlock_irq(&zfcp_data.config_lock);
902
903 port->units++;
904 zfcp_port_get(port);
905
906 return unit;
907 }
908
909 void
910 zfcp_unit_dequeue(struct zfcp_unit *unit)
911 {
912 zfcp_unit_wait(unit);
913 write_lock_irq(&zfcp_data.config_lock);
914 list_del(&unit->list);
915 write_unlock_irq(&zfcp_data.config_lock);
916 unit->port->units--;
917 zfcp_port_put(unit->port);
918 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
919 device_unregister(&unit->sysfs_device);
920 }
921
922 static void *
923 zfcp_mempool_alloc(unsigned int __nocast gfp_mask, void *size)
924 {
925 return kmalloc((size_t) size, gfp_mask);
926 }
927
928 static void
929 zfcp_mempool_free(void *element, void *size)
930 {
931 kfree(element);
932 }
933
934 /*
935 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
936 * commands.
937 * It also genrates fcp-nameserver request/response buffer and unsolicited
938 * status read fsf_req buffers.
939 *
940 * locks: must only be called with zfcp_data.config_sema taken
941 */
942 static int
943 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
944 {
945 adapter->pool.fsf_req_erp =
946 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
947 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
948 sizeof(struct zfcp_fsf_req_pool_element));
949
950 if (NULL == adapter->pool.fsf_req_erp)
951 return -ENOMEM;
952
953 adapter->pool.fsf_req_scsi =
954 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
955 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
956 sizeof(struct zfcp_fsf_req_pool_element));
957
958 if (NULL == adapter->pool.fsf_req_scsi)
959 return -ENOMEM;
960
961 adapter->pool.fsf_req_abort =
962 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
963 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
964 sizeof(struct zfcp_fsf_req_pool_element));
965
966 if (NULL == adapter->pool.fsf_req_abort)
967 return -ENOMEM;
968
969 adapter->pool.fsf_req_status_read =
970 mempool_create(ZFCP_POOL_STATUS_READ_NR,
971 zfcp_mempool_alloc, zfcp_mempool_free,
972 (void *) sizeof(struct zfcp_fsf_req));
973
974 if (NULL == adapter->pool.fsf_req_status_read)
975 return -ENOMEM;
976
977 adapter->pool.data_status_read =
978 mempool_create(ZFCP_POOL_STATUS_READ_NR,
979 zfcp_mempool_alloc, zfcp_mempool_free,
980 (void *) sizeof(struct fsf_status_read_buffer));
981
982 if (NULL == adapter->pool.data_status_read)
983 return -ENOMEM;
984
985 adapter->pool.data_gid_pn =
986 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
987 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
988 sizeof(struct zfcp_gid_pn_data));
989
990 if (NULL == adapter->pool.data_gid_pn)
991 return -ENOMEM;
992
993 return 0;
994 }
995
996 /**
997 * zfcp_free_low_mem_buffers - free memory pools of an adapter
998 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
999 * locking: zfcp_data.config_sema must be held
1000 */
1001 static void
1002 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1003 {
1004 if (adapter->pool.fsf_req_erp)
1005 mempool_destroy(adapter->pool.fsf_req_erp);
1006 if (adapter->pool.fsf_req_scsi)
1007 mempool_destroy(adapter->pool.fsf_req_scsi);
1008 if (adapter->pool.fsf_req_abort)
1009 mempool_destroy(adapter->pool.fsf_req_abort);
1010 if (adapter->pool.fsf_req_status_read)
1011 mempool_destroy(adapter->pool.fsf_req_status_read);
1012 if (adapter->pool.data_status_read)
1013 mempool_destroy(adapter->pool.data_status_read);
1014 if (adapter->pool.data_gid_pn)
1015 mempool_destroy(adapter->pool.data_gid_pn);
1016 }
1017
1018 /**
1019 * zfcp_adapter_debug_register - registers debug feature for an adapter
1020 * @adapter: pointer to adapter for which debug features should be registered
1021 * return: -ENOMEM on error, 0 otherwise
1022 */
1023 int
1024 zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
1025 {
1026 char dbf_name[20];
1027
1028 /* debug feature area which records SCSI command failures (hostbyte) */
1029 spin_lock_init(&adapter->dbf_lock);
1030
1031 sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
1032 zfcp_get_busid_by_adapter(adapter));
1033 adapter->cmd_dbf = debug_register(dbf_name, ZFCP_CMD_DBF_INDEX,
1034 ZFCP_CMD_DBF_AREAS,
1035 ZFCP_CMD_DBF_LENGTH);
1036 debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
1037 debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
1038
1039 /* debug feature area which records SCSI command aborts */
1040 sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
1041 zfcp_get_busid_by_adapter(adapter));
1042 adapter->abort_dbf = debug_register(dbf_name, ZFCP_ABORT_DBF_INDEX,
1043 ZFCP_ABORT_DBF_AREAS,
1044 ZFCP_ABORT_DBF_LENGTH);
1045 debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
1046 debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
1047
1048 /* debug feature area which records incoming ELS commands */
1049 sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
1050 zfcp_get_busid_by_adapter(adapter));
1051 adapter->in_els_dbf = debug_register(dbf_name, ZFCP_IN_ELS_DBF_INDEX,
1052 ZFCP_IN_ELS_DBF_AREAS,
1053 ZFCP_IN_ELS_DBF_LENGTH);
1054 debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
1055 debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
1056
1057 /* debug feature area which records erp events */
1058 sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
1059 zfcp_get_busid_by_adapter(adapter));
1060 adapter->erp_dbf = debug_register(dbf_name, ZFCP_ERP_DBF_INDEX,
1061 ZFCP_ERP_DBF_AREAS,
1062 ZFCP_ERP_DBF_LENGTH);
1063 debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
1064 debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
1065
1066 if (!(adapter->cmd_dbf && adapter->abort_dbf &&
1067 adapter->in_els_dbf && adapter->erp_dbf)) {
1068 zfcp_adapter_debug_unregister(adapter);
1069 return -ENOMEM;
1070 }
1071
1072 return 0;
1073
1074 }
1075
1076 /**
1077 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
1078 * @adapter: pointer to adapter for which debug features should be unregistered
1079 */
1080 void
1081 zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
1082 {
1083 debug_unregister(adapter->abort_dbf);
1084 debug_unregister(adapter->cmd_dbf);
1085 debug_unregister(adapter->erp_dbf);
1086 debug_unregister(adapter->in_els_dbf);
1087 adapter->abort_dbf = NULL;
1088 adapter->cmd_dbf = NULL;
1089 adapter->erp_dbf = NULL;
1090 adapter->in_els_dbf = NULL;
1091 }
1092
1093 void
1094 zfcp_dummy_release(struct device *dev)
1095 {
1096 return;
1097 }
1098
1099 /*
1100 * Enqueues an adapter at the end of the adapter list in the driver data.
1101 * All adapter internal structures are set up.
1102 * Proc-fs entries are also created.
1103 *
1104 * returns: 0 if a new adapter was successfully enqueued
1105 * ZFCP_KNOWN if an adapter with this devno was already present
1106 * -ENOMEM if alloc failed
1107 * locks: config_sema must be held to serialise changes to the adapter list
1108 */
1109 struct zfcp_adapter *
1110 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1111 {
1112 int retval = 0;
1113 struct zfcp_adapter *adapter;
1114
1115 /*
1116 * Note: It is safe to release the list_lock, as any list changes
1117 * are protected by the config_sema, which must be held to get here
1118 */
1119
1120 /* try to allocate new adapter data structure (zeroed) */
1121 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1122 if (!adapter) {
1123 ZFCP_LOG_INFO("error: allocation of base adapter "
1124 "structure failed\n");
1125 goto out;
1126 }
1127 memset(adapter, 0, sizeof (struct zfcp_adapter));
1128
1129 ccw_device->handler = NULL;
1130
1131 /* save ccw_device pointer */
1132 adapter->ccw_device = ccw_device;
1133
1134 retval = zfcp_qdio_allocate_queues(adapter);
1135 if (retval)
1136 goto queues_alloc_failed;
1137
1138 retval = zfcp_qdio_allocate(adapter);
1139 if (retval)
1140 goto qdio_allocate_failed;
1141
1142 retval = zfcp_allocate_low_mem_buffers(adapter);
1143 if (retval) {
1144 ZFCP_LOG_INFO("error: pool allocation failed\n");
1145 goto failed_low_mem_buffers;
1146 }
1147
1148 /* initialise reference count stuff */
1149 atomic_set(&adapter->refcount, 0);
1150 init_waitqueue_head(&adapter->remove_wq);
1151
1152 /* initialise list of ports */
1153 INIT_LIST_HEAD(&adapter->port_list_head);
1154
1155 /* initialise list of ports to be removed */
1156 INIT_LIST_HEAD(&adapter->port_remove_lh);
1157
1158 /* initialize list of fsf requests */
1159 spin_lock_init(&adapter->fsf_req_list_lock);
1160 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
1161
1162 /* initialize abort lock */
1163 rwlock_init(&adapter->abort_lock);
1164
1165 /* initialise some erp stuff */
1166 init_waitqueue_head(&adapter->erp_thread_wqh);
1167 init_waitqueue_head(&adapter->erp_done_wqh);
1168
1169 /* initialize lock of associated request queue */
1170 rwlock_init(&adapter->request_queue.queue_lock);
1171
1172 /* intitialise SCSI ER timer */
1173 init_timer(&adapter->scsi_er_timer);
1174
1175 /* set FC service class used per default */
1176 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1177
1178 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1179 ASCEBC(adapter->name, strlen(adapter->name));
1180
1181 /* mark adapter unusable as long as sysfs registration is not complete */
1182 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1183
1184 adapter->ccw_device = ccw_device;
1185 dev_set_drvdata(&ccw_device->dev, adapter);
1186
1187 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1188 goto sysfs_failed;
1189
1190 adapter->generic_services.parent = &adapter->ccw_device->dev;
1191 adapter->generic_services.release = zfcp_dummy_release;
1192 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1193 "generic_services");
1194
1195 if (device_register(&adapter->generic_services))
1196 goto generic_services_failed;
1197
1198 /* put allocated adapter at list tail */
1199 write_lock_irq(&zfcp_data.config_lock);
1200 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1201 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1202 write_unlock_irq(&zfcp_data.config_lock);
1203
1204 zfcp_data.adapters++;
1205
1206 goto out;
1207
1208 generic_services_failed:
1209 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1210 sysfs_failed:
1211 dev_set_drvdata(&ccw_device->dev, NULL);
1212 failed_low_mem_buffers:
1213 zfcp_free_low_mem_buffers(adapter);
1214 if (qdio_free(ccw_device) != 0)
1215 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1216 zfcp_get_busid_by_adapter(adapter));
1217 qdio_allocate_failed:
1218 zfcp_qdio_free_queues(adapter);
1219 queues_alloc_failed:
1220 kfree(adapter);
1221 adapter = NULL;
1222 out:
1223 return adapter;
1224 }
1225
1226 /*
1227 * returns: 0 - struct zfcp_adapter data structure successfully removed
1228 * !0 - struct zfcp_adapter data structure could not be removed
1229 * (e.g. still used)
1230 * locks: adapter list write lock is assumed to be held by caller
1231 * adapter->fsf_req_list_lock is taken and released within this
1232 * function and must not be held on entry
1233 */
1234 void
1235 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1236 {
1237 int retval = 0;
1238 unsigned long flags;
1239
1240 device_unregister(&adapter->generic_services);
1241 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1242 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1243 /* sanity check: no pending FSF requests */
1244 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1245 retval = !list_empty(&adapter->fsf_req_list_head);
1246 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1247 if (retval) {
1248 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1249 "%i requests outstanding\n",
1250 zfcp_get_busid_by_adapter(adapter), adapter,
1251 atomic_read(&adapter->fsf_reqs_active));
1252 retval = -EBUSY;
1253 goto out;
1254 }
1255
1256 /* remove specified adapter data structure from list */
1257 write_lock_irq(&zfcp_data.config_lock);
1258 list_del(&adapter->list);
1259 write_unlock_irq(&zfcp_data.config_lock);
1260
1261 /* decrease number of adapters in list */
1262 zfcp_data.adapters--;
1263
1264 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1265 "%i adapters still in list\n",
1266 zfcp_get_busid_by_adapter(adapter),
1267 adapter, zfcp_data.adapters);
1268
1269 retval = qdio_free(adapter->ccw_device);
1270 if (retval)
1271 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1272 zfcp_get_busid_by_adapter(adapter));
1273
1274 zfcp_free_low_mem_buffers(adapter);
1275 /* free memory of adapter data structure and queues */
1276 zfcp_qdio_free_queues(adapter);
1277 ZFCP_LOG_TRACE("freeing adapter structure\n");
1278 kfree(adapter);
1279 out:
1280 return;
1281 }
1282
1283 /**
1284 * zfcp_port_enqueue - enqueue port to port list of adapter
1285 * @adapter: adapter where remote port is added
1286 * @wwpn: WWPN of the remote port to be enqueued
1287 * @status: initial status for the port
1288 * @d_id: destination id of the remote port to be enqueued
1289 * Return: pointer to enqueued port on success, NULL on error
1290 * Locks: config_sema must be held to serialize changes to the port list
1291 *
1292 * All port internal structures are set up and the sysfs entry is generated.
1293 * d_id is used to enqueue ports with a well known address like the Directory
1294 * Service for nameserver lookup.
1295 */
1296 struct zfcp_port *
1297 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1298 u32 d_id)
1299 {
1300 struct zfcp_port *port;
1301 int check_wwpn;
1302
1303 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1304 /*
1305 * check that there is no port with this WWPN already in list
1306 */
1307 if (check_wwpn) {
1308 read_lock_irq(&zfcp_data.config_lock);
1309 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1310 read_unlock_irq(&zfcp_data.config_lock);
1311 if (port)
1312 return NULL;
1313 }
1314
1315 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1316 if (!port)
1317 return NULL;
1318 memset(port, 0, sizeof (struct zfcp_port));
1319
1320 /* initialise reference count stuff */
1321 atomic_set(&port->refcount, 0);
1322 init_waitqueue_head(&port->remove_wq);
1323
1324 INIT_LIST_HEAD(&port->unit_list_head);
1325 INIT_LIST_HEAD(&port->unit_remove_lh);
1326
1327 port->adapter = adapter;
1328
1329 if (check_wwpn)
1330 port->wwpn = wwpn;
1331
1332 atomic_set_mask(status, &port->status);
1333
1334 /* setup for sysfs registration */
1335 if (status & ZFCP_STATUS_PORT_WKA) {
1336 switch (d_id) {
1337 case ZFCP_DID_DIRECTORY_SERVICE:
1338 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1339 "directory");
1340 break;
1341 case ZFCP_DID_MANAGEMENT_SERVICE:
1342 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1343 "management");
1344 break;
1345 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1346 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1347 "key_distribution");
1348 break;
1349 case ZFCP_DID_ALIAS_SERVICE:
1350 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1351 "alias");
1352 break;
1353 case ZFCP_DID_TIME_SERVICE:
1354 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1355 "time");
1356 break;
1357 default:
1358 kfree(port);
1359 return NULL;
1360 }
1361 port->d_id = d_id;
1362 port->sysfs_device.parent = &adapter->generic_services;
1363 } else {
1364 snprintf(port->sysfs_device.bus_id,
1365 BUS_ID_SIZE, "0x%016llx", wwpn);
1366 port->sysfs_device.parent = &adapter->ccw_device->dev;
1367 }
1368 port->sysfs_device.release = zfcp_sysfs_port_release;
1369 dev_set_drvdata(&port->sysfs_device, port);
1370
1371 /* mark port unusable as long as sysfs registration is not complete */
1372 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1373
1374 if (device_register(&port->sysfs_device)) {
1375 kfree(port);
1376 return NULL;
1377 }
1378
1379 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1380 device_unregister(&port->sysfs_device);
1381 return NULL;
1382 }
1383
1384 zfcp_port_get(port);
1385
1386 write_lock_irq(&zfcp_data.config_lock);
1387 list_add_tail(&port->list, &adapter->port_list_head);
1388 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1389 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1390 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1391 if (!adapter->nameserver_port)
1392 adapter->nameserver_port = port;
1393 adapter->ports++;
1394 write_unlock_irq(&zfcp_data.config_lock);
1395
1396 zfcp_adapter_get(adapter);
1397
1398 return port;
1399 }
1400
1401 void
1402 zfcp_port_dequeue(struct zfcp_port *port)
1403 {
1404 zfcp_port_wait(port);
1405 write_lock_irq(&zfcp_data.config_lock);
1406 list_del(&port->list);
1407 port->adapter->ports--;
1408 write_unlock_irq(&zfcp_data.config_lock);
1409 if (port->rport)
1410 fc_remote_port_delete(port->rport);
1411 port->rport = NULL;
1412 zfcp_adapter_put(port->adapter);
1413 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1414 atomic_read(&port->status));
1415 device_unregister(&port->sysfs_device);
1416 }
1417
1418 /* Enqueues a nameserver port */
1419 int
1420 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1421 {
1422 struct zfcp_port *port;
1423
1424 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1425 ZFCP_DID_DIRECTORY_SERVICE);
1426 if (!port) {
1427 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1428 "adapter %s failed\n",
1429 zfcp_get_busid_by_adapter(adapter));
1430 return -ENXIO;
1431 }
1432 zfcp_port_put(port);
1433
1434 return 0;
1435 }
1436
1437 #undef ZFCP_LOG_AREA
1438
1439 /****************************************************************/
1440 /******* Fibre Channel Standard related Functions **************/
1441 /****************************************************************/
1442
1443 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1444
1445 void
1446 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1447 struct fsf_status_read_buffer *status_buffer)
1448 {
1449 struct fcp_rscn_head *fcp_rscn_head;
1450 struct fcp_rscn_element *fcp_rscn_element;
1451 struct zfcp_port *port;
1452 u16 i;
1453 u16 no_entries;
1454 u32 range_mask;
1455 unsigned long flags;
1456
1457 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1458 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1459
1460 /* see FC-FS */
1461 no_entries = (fcp_rscn_head->payload_len / 4);
1462
1463 zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
1464 fcp_rscn_head->payload_len);
1465
1466 debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
1467 for (i = 1; i < no_entries; i++) {
1468 /* skip head and start with 1st element */
1469 fcp_rscn_element++;
1470 switch (fcp_rscn_element->addr_format) {
1471 case ZFCP_PORT_ADDRESS:
1472 range_mask = ZFCP_PORTS_RANGE_PORT;
1473 break;
1474 case ZFCP_AREA_ADDRESS:
1475 range_mask = ZFCP_PORTS_RANGE_AREA;
1476 break;
1477 case ZFCP_DOMAIN_ADDRESS:
1478 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1479 break;
1480 case ZFCP_FABRIC_ADDRESS:
1481 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1482 break;
1483 default:
1484 ZFCP_LOG_INFO("incoming RSCN with unknown "
1485 "address format\n");
1486 continue;
1487 }
1488 read_lock_irqsave(&zfcp_data.config_lock, flags);
1489 list_for_each_entry(port, &adapter->port_list_head, list) {
1490 if (atomic_test_mask
1491 (ZFCP_STATUS_PORT_WKA, &port->status))
1492 continue;
1493 /* Do we know this port? If not skip it. */
1494 if (!atomic_test_mask
1495 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1496 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1497 "port 0x%016Lx\n", port->wwpn);
1498 debug_text_event(adapter->erp_dbf, 1,
1499 "unsol_els_rscnu:");
1500 zfcp_erp_port_reopen(port,
1501 ZFCP_STATUS_COMMON_ERP_FAILED);
1502 continue;
1503 }
1504
1505 /*
1506 * FIXME: race: d_id might being invalidated
1507 * (...DID_DID reset)
1508 */
1509 if ((port->d_id & range_mask)
1510 == (fcp_rscn_element->nport_did & range_mask)) {
1511 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1512 fcp_rscn_element->nport_did);
1513 /*
1514 * Unfortunately, an RSCN does not specify the
1515 * type of change a target underwent. We assume
1516 * that it makes sense to reopen the link.
1517 * FIXME: Shall we try to find out more about
1518 * the target and link state before closing it?
1519 * How to accomplish this? (nameserver?)
1520 * Where would such code be put in?
1521 * (inside or outside erp)
1522 */
1523 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1524 "port 0x%016Lx\n", port->wwpn);
1525 debug_text_event(adapter->erp_dbf, 1,
1526 "unsol_els_rscnk:");
1527 zfcp_test_link(port);
1528 }
1529 }
1530 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1531 }
1532 }
1533
1534 static void
1535 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1536 struct fsf_status_read_buffer *status_buffer)
1537 {
1538 logi *els_logi = (logi *) status_buffer->payload;
1539 struct zfcp_port *port;
1540 unsigned long flags;
1541
1542 zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
1543
1544 read_lock_irqsave(&zfcp_data.config_lock, flags);
1545 list_for_each_entry(port, &adapter->port_list_head, list) {
1546 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1547 break;
1548 }
1549 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1550
1551 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1552 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1553 "with d_id 0x%08x on adapter %s\n",
1554 status_buffer->d_id,
1555 zfcp_get_busid_by_adapter(adapter));
1556 } else {
1557 debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
1558 debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
1559 zfcp_erp_port_forced_reopen(port, 0);
1560 }
1561 }
1562
1563 static void
1564 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1565 struct fsf_status_read_buffer *status_buffer)
1566 {
1567 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1568 struct zfcp_port *port;
1569 unsigned long flags;
1570
1571 zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
1572
1573 read_lock_irqsave(&zfcp_data.config_lock, flags);
1574 list_for_each_entry(port, &adapter->port_list_head, list) {
1575 if (port->wwpn == els_logo->nport_wwpn)
1576 break;
1577 }
1578 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1579
1580 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1581 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1582 "with d_id 0x%08x on adapter %s\n",
1583 status_buffer->d_id,
1584 zfcp_get_busid_by_adapter(adapter));
1585 } else {
1586 debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
1587 debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
1588 zfcp_erp_port_forced_reopen(port, 0);
1589 }
1590 }
1591
1592 static void
1593 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1594 struct fsf_status_read_buffer *status_buffer)
1595 {
1596 zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
1597 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1598 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1599 zfcp_get_busid_by_adapter(adapter));
1600
1601 }
1602
1603 void
1604 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1605 {
1606 struct fsf_status_read_buffer *status_buffer;
1607 u32 els_type;
1608 struct zfcp_adapter *adapter;
1609
1610 status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1611 els_type = *(u32 *) (status_buffer->payload);
1612 adapter = fsf_req->adapter;
1613
1614 if (els_type == LS_PLOGI)
1615 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1616 else if (els_type == LS_LOGO)
1617 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1618 else if ((els_type & 0xffff0000) == LS_RSCN)
1619 /* we are only concerned with the command, not the length */
1620 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1621 else
1622 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1623 }
1624
1625
1626 /**
1627 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1628 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1629 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1630 */
1631 static int
1632 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1633 {
1634 struct zfcp_gid_pn_data *data;
1635
1636 if (pool != NULL) {
1637 data = mempool_alloc(pool, GFP_ATOMIC);
1638 if (likely(data != NULL)) {
1639 data->ct.pool = pool;
1640 }
1641 } else {
1642 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1643 }
1644
1645 if (NULL == data)
1646 return -ENOMEM;
1647
1648 memset(data, 0, sizeof(*data));
1649 data->ct.req = &data->req;
1650 data->ct.resp = &data->resp;
1651 data->ct.req_count = data->ct.resp_count = 1;
1652 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1653 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1654 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1655 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1656
1657 *gid_pn = data;
1658 return 0;
1659 }
1660
1661 /**
1662 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1663 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1664 */
1665 static void
1666 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1667 {
1668 if ((gid_pn->ct.pool != 0))
1669 mempool_free(gid_pn, gid_pn->ct.pool);
1670 else
1671 kfree(gid_pn);
1672
1673 return;
1674 }
1675
1676 /**
1677 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1678 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1679 */
1680 int
1681 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1682 {
1683 int ret;
1684 struct ct_iu_gid_pn_req *ct_iu_req;
1685 struct zfcp_gid_pn_data *gid_pn;
1686 struct zfcp_adapter *adapter = erp_action->adapter;
1687
1688 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1689 if (ret < 0) {
1690 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1691 "request failed for adapter %s\n",
1692 zfcp_get_busid_by_adapter(adapter));
1693 goto out;
1694 }
1695
1696 /* setup nameserver request */
1697 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1698 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1699 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1700 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1701 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1702 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1703 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1704 ct_iu_req->wwpn = erp_action->port->wwpn;
1705
1706 /* setup parameters for send generic command */
1707 gid_pn->ct.port = adapter->nameserver_port;
1708 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1709 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1710 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1711 gid_pn->ct.timer = &erp_action->timer;
1712 gid_pn->port = erp_action->port;
1713
1714 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1715 erp_action);
1716 if (ret) {
1717 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1718 "failed for adapter %s\n",
1719 zfcp_get_busid_by_adapter(adapter));
1720
1721 zfcp_gid_pn_buffers_free(gid_pn);
1722 }
1723
1724 out:
1725 return ret;
1726 }
1727
1728 /**
1729 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1730 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1731 */
1732 static void zfcp_ns_gid_pn_handler(unsigned long data)
1733 {
1734 struct zfcp_port *port;
1735 struct zfcp_send_ct *ct;
1736 struct ct_iu_gid_pn_req *ct_iu_req;
1737 struct ct_iu_gid_pn_resp *ct_iu_resp;
1738 struct zfcp_gid_pn_data *gid_pn;
1739
1740
1741 gid_pn = (struct zfcp_gid_pn_data *) data;
1742 port = gid_pn->port;
1743 ct = &gid_pn->ct;
1744 ct_iu_req = zfcp_sg_to_address(ct->req);
1745 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1746
1747 if (ct->status != 0)
1748 goto failed;
1749
1750 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1751 /* FIXME: do we need some specific erp entry points */
1752 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1753 goto failed;
1754 }
1755 /* paranoia */
1756 if (ct_iu_req->wwpn != port->wwpn) {
1757 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1758 "lookup does not match expected wwpn 0x%016Lx "
1759 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1760 zfcp_get_busid_by_port(port));
1761 goto mismatch;
1762 }
1763
1764 /* looks like a valid d_id */
1765 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1766 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1767 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1768 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1769 goto out;
1770
1771 mismatch:
1772 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1773 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1774 sizeof(struct ct_iu_gid_pn_req));
1775 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1776 sizeof(struct ct_iu_gid_pn_resp));
1777
1778 failed:
1779 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1780 "0x%016Lx for adapter %s\n",
1781 port->wwpn, zfcp_get_busid_by_port(port));
1782 out:
1783 zfcp_gid_pn_buffers_free(gid_pn);
1784 return;
1785 }
1786
1787 /* reject CT_IU reason codes acc. to FC-GS-4 */
1788 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1789 {0x01, "invalid command code"},
1790 {0x02, "invalid version level"},
1791 {0x03, "logical error"},
1792 {0x04, "invalid CT_IU size"},
1793 {0x05, "logical busy"},
1794 {0x07, "protocol error"},
1795 {0x09, "unable to perform command request"},
1796 {0x0b, "command not supported"},
1797 {0x0d, "server not available"},
1798 {0x0e, "session could not be established"},
1799 {0xff, "vendor specific error"},
1800 {0, NULL},
1801 };
1802
1803 /* LS_RJT reason codes acc. to FC-FS */
1804 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1805 {0x01, "invalid LS_Command code"},
1806 {0x03, "logical error"},
1807 {0x05, "logical busy"},
1808 {0x07, "protocol error"},
1809 {0x09, "unable to perform command request"},
1810 {0x0b, "command not supported"},
1811 {0x0e, "command already in progress"},
1812 {0xff, "vendor specific error"},
1813 {0, NULL},
1814 };
1815
1816 /* reject reason codes according to FC-PH/FC-FS */
1817 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1818 {0x01, "invalid D_ID"},
1819 {0x02, "invalid S_ID"},
1820 {0x03, "Nx_Port not available, temporary"},
1821 {0x04, "Nx_Port not available, permament"},
1822 {0x05, "class not supported"},
1823 {0x06, "delimiter usage error"},
1824 {0x07, "TYPE not supported"},
1825 {0x08, "invalid Link_Control"},
1826 {0x09, "invalid R_CTL field"},
1827 {0x0a, "invalid F_CTL field"},
1828 {0x0b, "invalid OX_ID"},
1829 {0x0c, "invalid RX_ID"},
1830 {0x0d, "invalid SEQ_ID"},
1831 {0x0e, "invalid DF_CTL"},
1832 {0x0f, "invalid SEQ_CNT"},
1833 {0x10, "invalid parameter field"},
1834 {0x11, "exchange error"},
1835 {0x12, "protocol error"},
1836 {0x13, "incorrect length"},
1837 {0x14, "unsupported ACK"},
1838 {0x15, "class of service not supported by entity at FFFFFE"},
1839 {0x16, "login required"},
1840 {0x17, "excessive sequences attempted"},
1841 {0x18, "unable to establish exchange"},
1842 {0x1a, "fabric path not available"},
1843 {0x1b, "invalid VC_ID (class 4)"},
1844 {0x1c, "invalid CS_CTL field"},
1845 {0x1d, "insufficient resources for VC (class 4)"},
1846 {0x1f, "invalid class of service"},
1847 {0x20, "preemption request rejected"},
1848 {0x21, "preemption not enabled"},
1849 {0x22, "multicast error"},
1850 {0x23, "multicast error terminate"},
1851 {0x24, "process login required"},
1852 {0xff, "vendor specific reject"},
1853 {0, NULL},
1854 };
1855
1856 /**
1857 * zfcp_rc_description - return description for given reaon code
1858 * @code: reason code
1859 * @rc_table: table of reason codes and descriptions
1860 */
1861 static inline const char *
1862 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1863 {
1864 const char *descr = "unknown reason code";
1865
1866 do {
1867 if (code == rc_table->code) {
1868 descr = rc_table->description;
1869 break;
1870 }
1871 rc_table++;
1872 } while (rc_table->code && rc_table->description);
1873
1874 return descr;
1875 }
1876
1877 /**
1878 * zfcp_check_ct_response - evaluate reason code for CT_IU
1879 * @rjt: response payload to an CT_IU request
1880 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1881 */
1882 int
1883 zfcp_check_ct_response(struct ct_hdr *rjt)
1884 {
1885 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1886 return 0;
1887
1888 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1889 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1890 "response code (0x%04hx)\n",
1891 rjt->cmd_rsp_code);
1892 return 1;
1893 }
1894
1895 ZFCP_LOG_INFO("Generic Service command rejected\n");
1896 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1897 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1898 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1899 (u32) rjt->vendor_unique);
1900
1901 return 1;
1902 }
1903
1904 /**
1905 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1906 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1907 * @rc_table: table of reason codes and descriptions
1908 */
1909 static inline void
1910 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1911 const struct zfcp_rc_entry *rc_table)
1912 {
1913 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1914 zfcp_rc_description(rjt_par->reason_code, rc_table),
1915 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1916 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1917 }
1918
1919 /**
1920 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1921 * @sq: status qualifier word
1922 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1923 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1924 */
1925 int
1926 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1927 {
1928 int ret = -EIO;
1929
1930 if (sq == FSF_IOSTAT_NPORT_RJT) {
1931 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1932 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1933 /* invalid d_id */
1934 if (rjt_par->reason_code == 0x01)
1935 ret = -EREMCHG;
1936 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1937 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1938 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1939 /* invalid d_id */
1940 if (rjt_par->reason_code == 0x01)
1941 ret = -EREMCHG;
1942 } else if (sq == FSF_IOSTAT_LS_RJT) {
1943 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1944 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1945 ret = -EREMOTEIO;
1946 } else
1947 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1948
1949 return ret;
1950 }
1951
1952 #undef ZFCP_LOG_AREA
x86 "subsystem" repository