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68d151aaa4749f893294d4a04150f57c59b6f509
[deliverable/linux.git] / drivers / s390 / scsi / zfcp_aux.c
1 /*
2 *
3 * linux/drivers/s390/scsi/zfcp_aux.c
4 *
5 * FCP adapter driver for IBM eServer zSeries
6 *
7 * (C) Copyright IBM Corp. 2002, 2004
8 *
9 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
10 * Raimund Schroeder <raimund.schroeder@de.ibm.com>
11 * Aron Zeh
12 * Wolfgang Taphorn
13 * Stefan Bader <stefan.bader@de.ibm.com>
14 * Heiko Carstens <heiko.carstens@de.ibm.com>
15 * Andreas Herrmann <aherrman@de.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2, or (at your option)
20 * any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32 #define ZFCP_AUX_REVISION "$Revision: 1.145 $"
33
34 #include "zfcp_ext.h"
35
36 /* accumulated log level (module parameter) */
37 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
38 static char *device;
39 /*********************** FUNCTION PROTOTYPES *********************************/
40
41 /* written against the module interface */
42 static int __init zfcp_module_init(void);
43
44 /* FCP related */
45 static void zfcp_ns_gid_pn_handler(unsigned long);
46
47 /* miscellaneous */
48 static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
49 static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
50 static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
51 void __user *, size_t);
52 static inline int zfcp_sg_list_copy_to_user(void __user *,
53 struct zfcp_sg_list *, size_t);
54
55 static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
56
57 #define ZFCP_CFDC_IOC_MAGIC 0xDD
58 #define ZFCP_CFDC_IOC \
59 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
60
61
62 static struct file_operations zfcp_cfdc_fops = {
63 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
64 #ifdef CONFIG_COMPAT
65 .compat_ioctl = zfcp_cfdc_dev_ioctl
66 #endif
67 };
68
69 static struct miscdevice zfcp_cfdc_misc = {
70 .minor = ZFCP_CFDC_DEV_MINOR,
71 .name = ZFCP_CFDC_DEV_NAME,
72 .fops = &zfcp_cfdc_fops
73 };
74
75 /*********************** KERNEL/MODULE PARAMETERS ***************************/
76
77 /* declare driver module init/cleanup functions */
78 module_init(zfcp_module_init);
79
80 MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
81 "Andreas Herrman <aherrman@de.ibm.com>, "
82 "Martin Peschke <mpeschke@de.ibm.com>, "
83 "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
84 "Wolfgang Taphorn <taphorn@de.ibm.com>, "
85 "Aron Zeh <arzeh@de.ibm.com>, "
86 "IBM Deutschland Entwicklung GmbH");
87 MODULE_DESCRIPTION
88 ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
89 MODULE_LICENSE("GPL");
90
91 module_param(device, charp, 0400);
92 MODULE_PARM_DESC(device, "specify initial device");
93
94 module_param(loglevel, uint, 0400);
95 MODULE_PARM_DESC(loglevel,
96 "log levels, 8 nibbles: "
97 "FC ERP QDIO CIO Config FSF SCSI Other, "
98 "levels: 0=none 1=normal 2=devel 3=trace");
99
100 #ifdef ZFCP_PRINT_FLAGS
101 u32 flags_dump = 0;
102 module_param(flags_dump, uint, 0);
103 #endif
104
105 /****************************************************************/
106 /************** Functions without logging ***********************/
107 /****************************************************************/
108
109 void
110 _zfcp_hex_dump(char *addr, int count)
111 {
112 int i;
113 for (i = 0; i < count; i++) {
114 printk("%02x", addr[i]);
115 if ((i % 4) == 3)
116 printk(" ");
117 if ((i % 32) == 31)
118 printk("\n");
119 }
120 if (((i-1) % 32) != 31)
121 printk("\n");
122 }
123
124 /****************************************************************/
125 /************** Uncategorised Functions *************************/
126 /****************************************************************/
127
128 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
129
130 static inline int
131 zfcp_fsf_req_is_scsi_cmnd(struct zfcp_fsf_req *fsf_req)
132 {
133 return ((fsf_req->fsf_command == FSF_QTCB_FCP_CMND) &&
134 !(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT));
135 }
136
137 void
138 zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
139 void *add_data, int add_length)
140 {
141 struct zfcp_adapter *adapter = fsf_req->adapter;
142 struct scsi_cmnd *scsi_cmnd;
143 int level = 3;
144 int i;
145 unsigned long flags;
146
147 spin_lock_irqsave(&adapter->dbf_lock, flags);
148 if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
149 scsi_cmnd = fsf_req->data.send_fcp_command_task.scsi_cmnd;
150 debug_text_event(adapter->cmd_dbf, level, "fsferror");
151 debug_text_event(adapter->cmd_dbf, level, text);
152 debug_event(adapter->cmd_dbf, level, &fsf_req,
153 sizeof (unsigned long));
154 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
155 sizeof (u32));
156 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
157 sizeof (unsigned long));
158 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
159 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
160 for (i = 0; i < add_length; i += ZFCP_CMD_DBF_LENGTH)
161 debug_event(adapter->cmd_dbf,
162 level,
163 (char *) add_data + i,
164 min(ZFCP_CMD_DBF_LENGTH, add_length - i));
165 }
166 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
167 }
168
169 /* XXX additionally log unit if available */
170 /* ---> introduce new parameter for unit, see 2.4 code */
171 void
172 zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
173 {
174 struct zfcp_adapter *adapter;
175 union zfcp_req_data *req_data;
176 struct zfcp_fsf_req *fsf_req;
177 int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
178 unsigned long flags;
179
180 adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
181 req_data = (union zfcp_req_data *) scsi_cmnd->host_scribble;
182 fsf_req = (req_data ? req_data->send_fcp_command_task.fsf_req : NULL);
183 spin_lock_irqsave(&adapter->dbf_lock, flags);
184 debug_text_event(adapter->cmd_dbf, level, "hostbyte");
185 debug_text_event(adapter->cmd_dbf, level, text);
186 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
187 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
188 sizeof (unsigned long));
189 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
190 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
191 if (likely(fsf_req)) {
192 debug_event(adapter->cmd_dbf, level, &fsf_req,
193 sizeof (unsigned long));
194 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
195 sizeof (u32));
196 } else {
197 debug_text_event(adapter->cmd_dbf, level, "");
198 debug_text_event(adapter->cmd_dbf, level, "");
199 }
200 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
201 }
202
203 void
204 zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
205 struct fsf_status_read_buffer *status_buffer, int length)
206 {
207 int level = 1;
208 int i;
209
210 debug_text_event(adapter->in_els_dbf, level, text);
211 debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
212 for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
213 debug_event(adapter->in_els_dbf,
214 level,
215 (char *) status_buffer->payload + i,
216 min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
217 }
218
219 /**
220 * zfcp_device_setup - setup function
221 * @str: pointer to parameter string
222 *
223 * Parse "device=..." parameter string.
224 */
225 static int __init
226 zfcp_device_setup(char *str)
227 {
228 char *tmp;
229
230 if (!str)
231 return 0;
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 return 1;
250
251 err_out:
252 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
253 return 0;
254 }
255
256 static void __init
257 zfcp_init_device_configure(void)
258 {
259 struct zfcp_adapter *adapter;
260 struct zfcp_port *port;
261 struct zfcp_unit *unit;
262
263 down(&zfcp_data.config_sema);
264 read_lock_irq(&zfcp_data.config_lock);
265 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
266 if (adapter)
267 zfcp_adapter_get(adapter);
268 read_unlock_irq(&zfcp_data.config_lock);
269
270 if (adapter == NULL)
271 goto out_adapter;
272 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
273 if (!port)
274 goto out_port;
275 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
276 if (!unit)
277 goto out_unit;
278 up(&zfcp_data.config_sema);
279 ccw_device_set_online(adapter->ccw_device);
280 zfcp_erp_wait(adapter);
281 down(&zfcp_data.config_sema);
282 zfcp_unit_put(unit);
283 out_unit:
284 zfcp_port_put(port);
285 out_port:
286 zfcp_adapter_put(adapter);
287 out_adapter:
288 up(&zfcp_data.config_sema);
289 return;
290 }
291
292 static int __init
293 zfcp_module_init(void)
294 {
295
296 int retval = 0;
297
298 atomic_set(&zfcp_data.loglevel, loglevel);
299
300 /* initialize adapter list */
301 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
302
303 /* initialize adapters to be removed list head */
304 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
305
306 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
307 if (!zfcp_transport_template)
308 return -ENODEV;
309
310 retval = misc_register(&zfcp_cfdc_misc);
311 if (retval != 0) {
312 ZFCP_LOG_INFO("registration of misc device "
313 "zfcp_cfdc failed\n");
314 goto out;
315 }
316
317 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
318 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
319
320 /* Initialise proc semaphores */
321 sema_init(&zfcp_data.config_sema, 1);
322
323 /* initialise configuration rw lock */
324 rwlock_init(&zfcp_data.config_lock);
325
326 /* save address of data structure managing the driver module */
327 zfcp_data.scsi_host_template.module = THIS_MODULE;
328
329 /* setup dynamic I/O */
330 retval = zfcp_ccw_register();
331 if (retval) {
332 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
333 goto out_ccw_register;
334 }
335
336 if (zfcp_device_setup(device))
337 zfcp_init_device_configure();
338
339 goto out;
340
341 out_ccw_register:
342 misc_deregister(&zfcp_cfdc_misc);
343 out:
344 return retval;
345 }
346
347 /*
348 * function: zfcp_cfdc_dev_ioctl
349 *
350 * purpose: Handle control file upload/download transaction via IOCTL
351 * interface
352 *
353 * returns: 0 - Operation completed successfuly
354 * -ENOTTY - Unknown IOCTL command
355 * -EINVAL - Invalid sense data record
356 * -ENXIO - The FCP adapter is not available
357 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
358 * -ENOMEM - Insufficient memory
359 * -EFAULT - User space memory I/O operation fault
360 * -EPERM - Cannot create or queue FSF request or create SBALs
361 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
362 */
363 static long
364 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
365 unsigned long buffer)
366 {
367 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
368 struct zfcp_adapter *adapter = NULL;
369 struct zfcp_fsf_req *fsf_req = NULL;
370 struct zfcp_sg_list *sg_list = NULL;
371 u32 fsf_command, option;
372 char *bus_id = NULL;
373 int retval = 0;
374
375 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
376 if (sense_data == NULL) {
377 retval = -ENOMEM;
378 goto out;
379 }
380
381 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
382 if (sg_list == NULL) {
383 retval = -ENOMEM;
384 goto out;
385 }
386 memset(sg_list, 0, sizeof(*sg_list));
387
388 if (command != ZFCP_CFDC_IOC) {
389 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
390 retval = -ENOTTY;
391 goto out;
392 }
393
394 if ((sense_data_user = (void __user *) buffer) == NULL) {
395 ZFCP_LOG_INFO("sense data record is required\n");
396 retval = -EINVAL;
397 goto out;
398 }
399
400 retval = copy_from_user(sense_data, sense_data_user,
401 sizeof(struct zfcp_cfdc_sense_data));
402 if (retval) {
403 retval = -EFAULT;
404 goto out;
405 }
406
407 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
408 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
409 ZFCP_CFDC_SIGNATURE);
410 retval = -EINVAL;
411 goto out;
412 }
413
414 switch (sense_data->command) {
415
416 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
417 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
418 option = FSF_CFDC_OPTION_NORMAL_MODE;
419 break;
420
421 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
422 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
423 option = FSF_CFDC_OPTION_FORCE;
424 break;
425
426 case ZFCP_CFDC_CMND_FULL_ACCESS:
427 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
428 option = FSF_CFDC_OPTION_FULL_ACCESS;
429 break;
430
431 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
432 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
433 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
434 break;
435
436 case ZFCP_CFDC_CMND_UPLOAD:
437 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
438 option = 0;
439 break;
440
441 default:
442 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
443 sense_data->command);
444 retval = -EINVAL;
445 goto out;
446 }
447
448 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
449 if (bus_id == NULL) {
450 retval = -ENOMEM;
451 goto out;
452 }
453 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
454 (sense_data->devno >> 24),
455 (sense_data->devno >> 16) & 0xFF,
456 (sense_data->devno & 0xFFFF));
457
458 read_lock_irq(&zfcp_data.config_lock);
459 adapter = zfcp_get_adapter_by_busid(bus_id);
460 if (adapter)
461 zfcp_adapter_get(adapter);
462 read_unlock_irq(&zfcp_data.config_lock);
463
464 kfree(bus_id);
465
466 if (adapter == NULL) {
467 ZFCP_LOG_INFO("invalid adapter\n");
468 retval = -ENXIO;
469 goto out;
470 }
471
472 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
473 retval = zfcp_sg_list_alloc(sg_list,
474 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
475 if (retval) {
476 retval = -ENOMEM;
477 goto out;
478 }
479 }
480
481 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
482 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
483 retval = zfcp_sg_list_copy_from_user(
484 sg_list, &sense_data_user->control_file,
485 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
486 if (retval) {
487 retval = -EFAULT;
488 goto out;
489 }
490 }
491
492 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
493 option, sg_list);
494 if (retval)
495 goto out;
496
497 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
498 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
499 retval = -ENXIO;
500 goto out;
501 }
502
503 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
504 memcpy(&sense_data->fsf_status_qual,
505 &fsf_req->qtcb->header.fsf_status_qual,
506 sizeof(union fsf_status_qual));
507 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
508
509 retval = copy_to_user(sense_data_user, sense_data,
510 sizeof(struct zfcp_cfdc_sense_data));
511 if (retval) {
512 retval = -EFAULT;
513 goto out;
514 }
515
516 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
517 retval = zfcp_sg_list_copy_to_user(
518 &sense_data_user->control_file, sg_list,
519 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
520 if (retval) {
521 retval = -EFAULT;
522 goto out;
523 }
524 }
525
526 out:
527 if (fsf_req != NULL)
528 zfcp_fsf_req_cleanup(fsf_req);
529
530 if ((adapter != NULL) && (retval != -ENXIO))
531 zfcp_adapter_put(adapter);
532
533 if (sg_list != NULL) {
534 zfcp_sg_list_free(sg_list);
535 kfree(sg_list);
536 }
537
538 if (sense_data != NULL)
539 kfree(sense_data);
540
541 return retval;
542 }
543
544
545 /**
546 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
547 * @sg_list: structure describing a scatter gather list
548 * @size: size of scatter-gather list
549 * Return: 0 on success, else -ENOMEM
550 *
551 * In sg_list->sg a pointer to the created scatter-gather list is returned,
552 * or NULL if we run out of memory. sg_list->count specifies the number of
553 * elements of the scatter-gather list. The maximum size of a single element
554 * in the scatter-gather list is PAGE_SIZE.
555 */
556 static inline int
557 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
558 {
559 struct scatterlist *sg;
560 unsigned int i;
561 int retval = 0;
562 void *address;
563
564 BUG_ON(sg_list == NULL);
565
566 sg_list->count = size >> PAGE_SHIFT;
567 if (size & ~PAGE_MASK)
568 sg_list->count++;
569 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
570 GFP_KERNEL);
571 if (sg_list->sg == NULL) {
572 sg_list->count = 0;
573 retval = -ENOMEM;
574 goto out;
575 }
576 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
577
578 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
579 sg->length = min(size, PAGE_SIZE);
580 sg->offset = 0;
581 address = (void *) get_zeroed_page(GFP_KERNEL);
582 if (address == NULL) {
583 sg_list->count = i;
584 zfcp_sg_list_free(sg_list);
585 retval = -ENOMEM;
586 goto out;
587 }
588 zfcp_address_to_sg(address, sg);
589 size -= sg->length;
590 }
591
592 out:
593 return retval;
594 }
595
596
597 /**
598 * zfcp_sg_list_free - free memory of a scatter-gather list
599 * @sg_list: structure describing a scatter-gather list
600 *
601 * Memory for each element in the scatter-gather list is freed.
602 * Finally sg_list->sg is freed itself and sg_list->count is reset.
603 */
604 static inline void
605 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
606 {
607 struct scatterlist *sg;
608 unsigned int i;
609
610 BUG_ON(sg_list == NULL);
611
612 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
613 free_page((unsigned long) zfcp_sg_to_address(sg));
614
615 sg_list->count = 0;
616 kfree(sg_list->sg);
617 }
618
619 /**
620 * zfcp_sg_size - determine size of a scatter-gather list
621 * @sg: array of (struct scatterlist)
622 * @sg_count: elements in array
623 * Return: size of entire scatter-gather list
624 */
625 size_t
626 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
627 {
628 unsigned int i;
629 struct scatterlist *p;
630 size_t size;
631
632 size = 0;
633 for (i = 0, p = sg; i < sg_count; i++, p++) {
634 BUG_ON(p == NULL);
635 size += p->length;
636 }
637
638 return size;
639 }
640
641
642 /**
643 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
644 * @sg_list: structure describing a scatter-gather list
645 * @user_buffer: pointer to buffer in user space
646 * @size: number of bytes to be copied
647 * Return: 0 on success, -EFAULT if copy_from_user fails.
648 */
649 static inline int
650 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
651 void __user *user_buffer,
652 size_t size)
653 {
654 struct scatterlist *sg;
655 unsigned int length;
656 void *zfcp_buffer;
657 int retval = 0;
658
659 BUG_ON(sg_list == NULL);
660
661 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
662 return -EFAULT;
663
664 for (sg = sg_list->sg; size > 0; sg++) {
665 length = min((unsigned int)size, sg->length);
666 zfcp_buffer = zfcp_sg_to_address(sg);
667 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
668 retval = -EFAULT;
669 goto out;
670 }
671 user_buffer += length;
672 size -= length;
673 }
674
675 out:
676 return retval;
677 }
678
679
680 /**
681 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
682 * @user_buffer: pointer to buffer in user space
683 * @sg_list: structure describing a scatter-gather list
684 * @size: number of bytes to be copied
685 * Return: 0 on success, -EFAULT if copy_to_user fails
686 */
687 static inline int
688 zfcp_sg_list_copy_to_user(void __user *user_buffer,
689 struct zfcp_sg_list *sg_list,
690 size_t size)
691 {
692 struct scatterlist *sg;
693 unsigned int length;
694 void *zfcp_buffer;
695 int retval = 0;
696
697 BUG_ON(sg_list == NULL);
698
699 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
700 return -EFAULT;
701
702 for (sg = sg_list->sg; size > 0; sg++) {
703 length = min((unsigned int) size, sg->length);
704 zfcp_buffer = zfcp_sg_to_address(sg);
705 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
706 retval = -EFAULT;
707 goto out;
708 }
709 user_buffer += length;
710 size -= length;
711 }
712
713 out:
714 return retval;
715 }
716
717
718 #undef ZFCP_LOG_AREA
719
720 /****************************************************************/
721 /****** Functions for configuration/set-up of structures ********/
722 /****************************************************************/
723
724 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
725
726 /**
727 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
728 * @port: pointer to port to search for unit
729 * @fcp_lun: FCP LUN to search for
730 * Traverse list of all units of a port and return pointer to a unit
731 * with the given FCP LUN.
732 */
733 struct zfcp_unit *
734 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
735 {
736 struct zfcp_unit *unit;
737 int found = 0;
738
739 list_for_each_entry(unit, &port->unit_list_head, list) {
740 if ((unit->fcp_lun == fcp_lun) &&
741 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
742 {
743 found = 1;
744 break;
745 }
746 }
747 return found ? unit : NULL;
748 }
749
750 /**
751 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
752 * @adapter: pointer to adapter to search for port
753 * @wwpn: wwpn to search for
754 * Traverse list of all ports of an adapter and return pointer to a port
755 * with the given wwpn.
756 */
757 struct zfcp_port *
758 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
759 {
760 struct zfcp_port *port;
761 int found = 0;
762
763 list_for_each_entry(port, &adapter->port_list_head, list) {
764 if ((port->wwpn == wwpn) &&
765 !(atomic_read(&port->status) &
766 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
767 found = 1;
768 break;
769 }
770 }
771 return found ? port : NULL;
772 }
773
774 /**
775 * zfcp_get_port_by_did - find port in port list of adapter by d_id
776 * @adapter: pointer to adapter to search for port
777 * @d_id: d_id to search for
778 * Traverse list of all ports of an adapter and return pointer to a port
779 * with the given d_id.
780 */
781 struct zfcp_port *
782 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
783 {
784 struct zfcp_port *port;
785 int found = 0;
786
787 list_for_each_entry(port, &adapter->port_list_head, list) {
788 if ((port->d_id == d_id) &&
789 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
790 {
791 found = 1;
792 break;
793 }
794 }
795 return found ? port : NULL;
796 }
797
798 /**
799 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
800 * @bus_id: bus_id to search for
801 * Traverse list of all adapters and return pointer to an adapter
802 * with the given bus_id.
803 */
804 struct zfcp_adapter *
805 zfcp_get_adapter_by_busid(char *bus_id)
806 {
807 struct zfcp_adapter *adapter;
808 int found = 0;
809
810 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
811 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
812 BUS_ID_SIZE) == 0) &&
813 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
814 &adapter->status)){
815 found = 1;
816 break;
817 }
818 }
819 return found ? adapter : NULL;
820 }
821
822 /**
823 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
824 * @port: pointer to port where unit is added
825 * @fcp_lun: FCP LUN of unit to be enqueued
826 * Return: pointer to enqueued unit on success, NULL on error
827 * Locks: config_sema must be held to serialize changes to the unit list
828 *
829 * Sets up some unit internal structures and creates sysfs entry.
830 */
831 struct zfcp_unit *
832 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
833 {
834 struct zfcp_unit *unit, *tmp_unit;
835 scsi_lun_t scsi_lun;
836 int found;
837
838 /*
839 * check that there is no unit with this FCP_LUN already in list
840 * and enqueue it.
841 * Note: Unlike for the adapter and the port, this is an error
842 */
843 read_lock_irq(&zfcp_data.config_lock);
844 unit = zfcp_get_unit_by_lun(port, fcp_lun);
845 read_unlock_irq(&zfcp_data.config_lock);
846 if (unit)
847 return NULL;
848
849 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
850 if (!unit)
851 return NULL;
852 memset(unit, 0, sizeof (struct zfcp_unit));
853
854 /* initialise reference count stuff */
855 atomic_set(&unit->refcount, 0);
856 init_waitqueue_head(&unit->remove_wq);
857
858 unit->port = port;
859 unit->fcp_lun = fcp_lun;
860
861 /* setup for sysfs registration */
862 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
863 unit->sysfs_device.parent = &port->sysfs_device;
864 unit->sysfs_device.release = zfcp_sysfs_unit_release;
865 dev_set_drvdata(&unit->sysfs_device, unit);
866
867 /* mark unit unusable as long as sysfs registration is not complete */
868 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
869
870 if (device_register(&unit->sysfs_device)) {
871 kfree(unit);
872 return NULL;
873 }
874
875 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
876 device_unregister(&unit->sysfs_device);
877 return NULL;
878 }
879
880 zfcp_unit_get(unit);
881
882 scsi_lun = 0;
883 found = 0;
884 write_lock_irq(&zfcp_data.config_lock);
885 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
886 if (tmp_unit->scsi_lun != scsi_lun) {
887 found = 1;
888 break;
889 }
890 scsi_lun++;
891 }
892 unit->scsi_lun = scsi_lun;
893 if (found)
894 list_add_tail(&unit->list, &tmp_unit->list);
895 else
896 list_add_tail(&unit->list, &port->unit_list_head);
897 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
898 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
899 write_unlock_irq(&zfcp_data.config_lock);
900
901 port->units++;
902 zfcp_port_get(port);
903
904 return unit;
905 }
906
907 void
908 zfcp_unit_dequeue(struct zfcp_unit *unit)
909 {
910 zfcp_unit_wait(unit);
911 write_lock_irq(&zfcp_data.config_lock);
912 list_del(&unit->list);
913 write_unlock_irq(&zfcp_data.config_lock);
914 unit->port->units--;
915 zfcp_port_put(unit->port);
916 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
917 device_unregister(&unit->sysfs_device);
918 }
919
920 static void *
921 zfcp_mempool_alloc(unsigned int __nocast gfp_mask, void *size)
922 {
923 return kmalloc((size_t) size, gfp_mask);
924 }
925
926 static void
927 zfcp_mempool_free(void *element, void *size)
928 {
929 kfree(element);
930 }
931
932 /*
933 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
934 * commands.
935 * It also genrates fcp-nameserver request/response buffer and unsolicited
936 * status read fsf_req buffers.
937 *
938 * locks: must only be called with zfcp_data.config_sema taken
939 */
940 static int
941 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
942 {
943 adapter->pool.fsf_req_erp =
944 mempool_create(ZFCP_POOL_FSF_REQ_ERP_NR,
945 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
946 sizeof(struct zfcp_fsf_req_pool_element));
947
948 if (NULL == adapter->pool.fsf_req_erp)
949 return -ENOMEM;
950
951 adapter->pool.fsf_req_scsi =
952 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_NR,
953 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
954 sizeof(struct zfcp_fsf_req_pool_element));
955
956 if (NULL == adapter->pool.fsf_req_scsi)
957 return -ENOMEM;
958
959 adapter->pool.fsf_req_abort =
960 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
961 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
962 sizeof(struct zfcp_fsf_req_pool_element));
963
964 if (NULL == adapter->pool.fsf_req_abort)
965 return -ENOMEM;
966
967 adapter->pool.fsf_req_status_read =
968 mempool_create(ZFCP_POOL_STATUS_READ_NR,
969 zfcp_mempool_alloc, zfcp_mempool_free,
970 (void *) sizeof(struct zfcp_fsf_req));
971
972 if (NULL == adapter->pool.fsf_req_status_read)
973 return -ENOMEM;
974
975 adapter->pool.data_status_read =
976 mempool_create(ZFCP_POOL_STATUS_READ_NR,
977 zfcp_mempool_alloc, zfcp_mempool_free,
978 (void *) sizeof(struct fsf_status_read_buffer));
979
980 if (NULL == adapter->pool.data_status_read)
981 return -ENOMEM;
982
983 adapter->pool.data_gid_pn =
984 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
985 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
986 sizeof(struct zfcp_gid_pn_data));
987
988 if (NULL == adapter->pool.data_gid_pn)
989 return -ENOMEM;
990
991 return 0;
992 }
993
994 /**
995 * zfcp_free_low_mem_buffers - free memory pools of an adapter
996 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
997 * locking: zfcp_data.config_sema must be held
998 */
999 static void
1000 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1001 {
1002 if (adapter->pool.fsf_req_erp)
1003 mempool_destroy(adapter->pool.fsf_req_erp);
1004 if (adapter->pool.fsf_req_scsi)
1005 mempool_destroy(adapter->pool.fsf_req_scsi);
1006 if (adapter->pool.fsf_req_abort)
1007 mempool_destroy(adapter->pool.fsf_req_abort);
1008 if (adapter->pool.fsf_req_status_read)
1009 mempool_destroy(adapter->pool.fsf_req_status_read);
1010 if (adapter->pool.data_status_read)
1011 mempool_destroy(adapter->pool.data_status_read);
1012 if (adapter->pool.data_gid_pn)
1013 mempool_destroy(adapter->pool.data_gid_pn);
1014 }
1015
1016 /**
1017 * zfcp_adapter_debug_register - registers debug feature for an adapter
1018 * @adapter: pointer to adapter for which debug features should be registered
1019 * return: -ENOMEM on error, 0 otherwise
1020 */
1021 int
1022 zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
1023 {
1024 char dbf_name[20];
1025
1026 /* debug feature area which records SCSI command failures (hostbyte) */
1027 spin_lock_init(&adapter->dbf_lock);
1028
1029 sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
1030 zfcp_get_busid_by_adapter(adapter));
1031 adapter->cmd_dbf = debug_register(dbf_name, ZFCP_CMD_DBF_INDEX,
1032 ZFCP_CMD_DBF_AREAS,
1033 ZFCP_CMD_DBF_LENGTH);
1034 debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
1035 debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
1036
1037 /* debug feature area which records SCSI command aborts */
1038 sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
1039 zfcp_get_busid_by_adapter(adapter));
1040 adapter->abort_dbf = debug_register(dbf_name, ZFCP_ABORT_DBF_INDEX,
1041 ZFCP_ABORT_DBF_AREAS,
1042 ZFCP_ABORT_DBF_LENGTH);
1043 debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
1044 debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
1045
1046 /* debug feature area which records incoming ELS commands */
1047 sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
1048 zfcp_get_busid_by_adapter(adapter));
1049 adapter->in_els_dbf = debug_register(dbf_name, ZFCP_IN_ELS_DBF_INDEX,
1050 ZFCP_IN_ELS_DBF_AREAS,
1051 ZFCP_IN_ELS_DBF_LENGTH);
1052 debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
1053 debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
1054
1055 /* debug feature area which records erp events */
1056 sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
1057 zfcp_get_busid_by_adapter(adapter));
1058 adapter->erp_dbf = debug_register(dbf_name, ZFCP_ERP_DBF_INDEX,
1059 ZFCP_ERP_DBF_AREAS,
1060 ZFCP_ERP_DBF_LENGTH);
1061 debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
1062 debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
1063
1064 if (!(adapter->cmd_dbf && adapter->abort_dbf &&
1065 adapter->in_els_dbf && adapter->erp_dbf)) {
1066 zfcp_adapter_debug_unregister(adapter);
1067 return -ENOMEM;
1068 }
1069
1070 return 0;
1071
1072 }
1073
1074 /**
1075 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
1076 * @adapter: pointer to adapter for which debug features should be unregistered
1077 */
1078 void
1079 zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
1080 {
1081 debug_unregister(adapter->abort_dbf);
1082 debug_unregister(adapter->cmd_dbf);
1083 debug_unregister(adapter->erp_dbf);
1084 debug_unregister(adapter->in_els_dbf);
1085 adapter->abort_dbf = NULL;
1086 adapter->cmd_dbf = NULL;
1087 adapter->erp_dbf = NULL;
1088 adapter->in_els_dbf = NULL;
1089 }
1090
1091 void
1092 zfcp_dummy_release(struct device *dev)
1093 {
1094 return;
1095 }
1096
1097 /*
1098 * Enqueues an adapter at the end of the adapter list in the driver data.
1099 * All adapter internal structures are set up.
1100 * Proc-fs entries are also created.
1101 *
1102 * returns: 0 if a new adapter was successfully enqueued
1103 * ZFCP_KNOWN if an adapter with this devno was already present
1104 * -ENOMEM if alloc failed
1105 * locks: config_sema must be held to serialise changes to the adapter list
1106 */
1107 struct zfcp_adapter *
1108 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1109 {
1110 int retval = 0;
1111 struct zfcp_adapter *adapter;
1112
1113 /*
1114 * Note: It is safe to release the list_lock, as any list changes
1115 * are protected by the config_sema, which must be held to get here
1116 */
1117
1118 /* try to allocate new adapter data structure (zeroed) */
1119 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1120 if (!adapter) {
1121 ZFCP_LOG_INFO("error: allocation of base adapter "
1122 "structure failed\n");
1123 goto out;
1124 }
1125 memset(adapter, 0, sizeof (struct zfcp_adapter));
1126
1127 ccw_device->handler = NULL;
1128
1129 /* save ccw_device pointer */
1130 adapter->ccw_device = ccw_device;
1131
1132 retval = zfcp_qdio_allocate_queues(adapter);
1133 if (retval)
1134 goto queues_alloc_failed;
1135
1136 retval = zfcp_qdio_allocate(adapter);
1137 if (retval)
1138 goto qdio_allocate_failed;
1139
1140 retval = zfcp_allocate_low_mem_buffers(adapter);
1141 if (retval) {
1142 ZFCP_LOG_INFO("error: pool allocation failed\n");
1143 goto failed_low_mem_buffers;
1144 }
1145
1146 /* initialise reference count stuff */
1147 atomic_set(&adapter->refcount, 0);
1148 init_waitqueue_head(&adapter->remove_wq);
1149
1150 /* initialise list of ports */
1151 INIT_LIST_HEAD(&adapter->port_list_head);
1152
1153 /* initialise list of ports to be removed */
1154 INIT_LIST_HEAD(&adapter->port_remove_lh);
1155
1156 /* initialize list of fsf requests */
1157 rwlock_init(&adapter->fsf_req_list_lock);
1158 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
1159
1160 /* initialize abort lock */
1161 rwlock_init(&adapter->abort_lock);
1162
1163 /* initialise some erp stuff */
1164 init_waitqueue_head(&adapter->erp_thread_wqh);
1165 init_waitqueue_head(&adapter->erp_done_wqh);
1166
1167 /* initialize lock of associated request queue */
1168 rwlock_init(&adapter->request_queue.queue_lock);
1169
1170 /* intitialise SCSI ER timer */
1171 init_timer(&adapter->scsi_er_timer);
1172
1173 /* set FC service class used per default */
1174 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1175
1176 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1177 ASCEBC(adapter->name, strlen(adapter->name));
1178
1179 /* mark adapter unusable as long as sysfs registration is not complete */
1180 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1181
1182 adapter->ccw_device = ccw_device;
1183 dev_set_drvdata(&ccw_device->dev, adapter);
1184
1185 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1186 goto sysfs_failed;
1187
1188 adapter->generic_services.parent = &adapter->ccw_device->dev;
1189 adapter->generic_services.release = zfcp_dummy_release;
1190 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1191 "generic_services");
1192
1193 if (device_register(&adapter->generic_services))
1194 goto generic_services_failed;
1195
1196 /* put allocated adapter at list tail */
1197 write_lock_irq(&zfcp_data.config_lock);
1198 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1199 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1200 write_unlock_irq(&zfcp_data.config_lock);
1201
1202 zfcp_data.adapters++;
1203
1204 goto out;
1205
1206 generic_services_failed:
1207 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1208 sysfs_failed:
1209 dev_set_drvdata(&ccw_device->dev, NULL);
1210 failed_low_mem_buffers:
1211 zfcp_free_low_mem_buffers(adapter);
1212 if (qdio_free(ccw_device) != 0)
1213 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1214 zfcp_get_busid_by_adapter(adapter));
1215 qdio_allocate_failed:
1216 zfcp_qdio_free_queues(adapter);
1217 queues_alloc_failed:
1218 kfree(adapter);
1219 adapter = NULL;
1220 out:
1221 return adapter;
1222 }
1223
1224 /*
1225 * returns: 0 - struct zfcp_adapter data structure successfully removed
1226 * !0 - struct zfcp_adapter data structure could not be removed
1227 * (e.g. still used)
1228 * locks: adapter list write lock is assumed to be held by caller
1229 * adapter->fsf_req_list_lock is taken and released within this
1230 * function and must not be held on entry
1231 */
1232 void
1233 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1234 {
1235 int retval = 0;
1236 unsigned long flags;
1237
1238 device_unregister(&adapter->generic_services);
1239 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1240 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1241 /* sanity check: no pending FSF requests */
1242 read_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1243 retval = !list_empty(&adapter->fsf_req_list_head);
1244 read_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1245 if (retval) {
1246 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1247 "%i requests outstanding\n",
1248 zfcp_get_busid_by_adapter(adapter), adapter,
1249 atomic_read(&adapter->fsf_reqs_active));
1250 retval = -EBUSY;
1251 goto out;
1252 }
1253
1254 /* remove specified adapter data structure from list */
1255 write_lock_irq(&zfcp_data.config_lock);
1256 list_del(&adapter->list);
1257 write_unlock_irq(&zfcp_data.config_lock);
1258
1259 /* decrease number of adapters in list */
1260 zfcp_data.adapters--;
1261
1262 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1263 "%i adapters still in list\n",
1264 zfcp_get_busid_by_adapter(adapter),
1265 adapter, zfcp_data.adapters);
1266
1267 retval = qdio_free(adapter->ccw_device);
1268 if (retval)
1269 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1270 zfcp_get_busid_by_adapter(adapter));
1271
1272 zfcp_free_low_mem_buffers(adapter);
1273 /* free memory of adapter data structure and queues */
1274 zfcp_qdio_free_queues(adapter);
1275 ZFCP_LOG_TRACE("freeing adapter structure\n");
1276 kfree(adapter);
1277 out:
1278 return;
1279 }
1280
1281 /**
1282 * zfcp_port_enqueue - enqueue port to port list of adapter
1283 * @adapter: adapter where remote port is added
1284 * @wwpn: WWPN of the remote port to be enqueued
1285 * @status: initial status for the port
1286 * @d_id: destination id of the remote port to be enqueued
1287 * Return: pointer to enqueued port on success, NULL on error
1288 * Locks: config_sema must be held to serialize changes to the port list
1289 *
1290 * All port internal structures are set up and the sysfs entry is generated.
1291 * d_id is used to enqueue ports with a well known address like the Directory
1292 * Service for nameserver lookup.
1293 */
1294 struct zfcp_port *
1295 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1296 u32 d_id)
1297 {
1298 struct zfcp_port *port, *tmp_port;
1299 int check_wwpn;
1300 scsi_id_t scsi_id;
1301 int found;
1302
1303 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1304
1305 /*
1306 * check that there is no port with this WWPN already in list
1307 */
1308 if (check_wwpn) {
1309 read_lock_irq(&zfcp_data.config_lock);
1310 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1311 read_unlock_irq(&zfcp_data.config_lock);
1312 if (port)
1313 return NULL;
1314 }
1315
1316 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1317 if (!port)
1318 return NULL;
1319 memset(port, 0, sizeof (struct zfcp_port));
1320
1321 /* initialise reference count stuff */
1322 atomic_set(&port->refcount, 0);
1323 init_waitqueue_head(&port->remove_wq);
1324
1325 INIT_LIST_HEAD(&port->unit_list_head);
1326 INIT_LIST_HEAD(&port->unit_remove_lh);
1327
1328 port->adapter = adapter;
1329
1330 if (check_wwpn)
1331 port->wwpn = wwpn;
1332
1333 atomic_set_mask(status, &port->status);
1334
1335 /* setup for sysfs registration */
1336 if (status & ZFCP_STATUS_PORT_WKA) {
1337 switch (d_id) {
1338 case ZFCP_DID_DIRECTORY_SERVICE:
1339 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1340 "directory");
1341 break;
1342 case ZFCP_DID_MANAGEMENT_SERVICE:
1343 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1344 "management");
1345 break;
1346 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1347 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1348 "key_distribution");
1349 break;
1350 case ZFCP_DID_ALIAS_SERVICE:
1351 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1352 "alias");
1353 break;
1354 case ZFCP_DID_TIME_SERVICE:
1355 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1356 "time");
1357 break;
1358 default:
1359 kfree(port);
1360 return NULL;
1361 }
1362 port->d_id = d_id;
1363 port->sysfs_device.parent = &adapter->generic_services;
1364 } else {
1365 snprintf(port->sysfs_device.bus_id,
1366 BUS_ID_SIZE, "0x%016llx", wwpn);
1367 port->sysfs_device.parent = &adapter->ccw_device->dev;
1368 }
1369 port->sysfs_device.release = zfcp_sysfs_port_release;
1370 dev_set_drvdata(&port->sysfs_device, port);
1371
1372 /* mark port unusable as long as sysfs registration is not complete */
1373 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1374
1375 if (device_register(&port->sysfs_device)) {
1376 kfree(port);
1377 return NULL;
1378 }
1379
1380 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1381 device_unregister(&port->sysfs_device);
1382 return NULL;
1383 }
1384
1385 zfcp_port_get(port);
1386
1387 scsi_id = 1;
1388 found = 0;
1389 write_lock_irq(&zfcp_data.config_lock);
1390 list_for_each_entry(tmp_port, &adapter->port_list_head, list) {
1391 if (atomic_test_mask(ZFCP_STATUS_PORT_NO_SCSI_ID,
1392 &tmp_port->status))
1393 continue;
1394 if (tmp_port->scsi_id != scsi_id) {
1395 found = 1;
1396 break;
1397 }
1398 scsi_id++;
1399 }
1400 port->scsi_id = scsi_id;
1401 if (found)
1402 list_add_tail(&port->list, &tmp_port->list);
1403 else
1404 list_add_tail(&port->list, &adapter->port_list_head);
1405 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1406 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1407 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1408 if (!adapter->nameserver_port)
1409 adapter->nameserver_port = port;
1410 adapter->ports++;
1411 write_unlock_irq(&zfcp_data.config_lock);
1412
1413 zfcp_adapter_get(adapter);
1414
1415 return port;
1416 }
1417
1418 void
1419 zfcp_port_dequeue(struct zfcp_port *port)
1420 {
1421 zfcp_port_wait(port);
1422 write_lock_irq(&zfcp_data.config_lock);
1423 list_del(&port->list);
1424 port->adapter->ports--;
1425 write_unlock_irq(&zfcp_data.config_lock);
1426 zfcp_adapter_put(port->adapter);
1427 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1428 atomic_read(&port->status));
1429 device_unregister(&port->sysfs_device);
1430 }
1431
1432 /* Enqueues a nameserver port */
1433 int
1434 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1435 {
1436 struct zfcp_port *port;
1437
1438 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1439 ZFCP_DID_DIRECTORY_SERVICE);
1440 if (!port) {
1441 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1442 "adapter %s failed\n",
1443 zfcp_get_busid_by_adapter(adapter));
1444 return -ENXIO;
1445 }
1446 zfcp_port_put(port);
1447
1448 return 0;
1449 }
1450
1451 #undef ZFCP_LOG_AREA
1452
1453 /****************************************************************/
1454 /******* Fibre Channel Standard related Functions **************/
1455 /****************************************************************/
1456
1457 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1458
1459 void
1460 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1461 struct fsf_status_read_buffer *status_buffer)
1462 {
1463 struct fcp_rscn_head *fcp_rscn_head;
1464 struct fcp_rscn_element *fcp_rscn_element;
1465 struct zfcp_port *port;
1466 u16 i;
1467 u16 no_entries;
1468 u32 range_mask;
1469 unsigned long flags;
1470
1471 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1472 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1473
1474 /* see FC-FS */
1475 no_entries = (fcp_rscn_head->payload_len / 4);
1476
1477 zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
1478 fcp_rscn_head->payload_len);
1479
1480 debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
1481 for (i = 1; i < no_entries; i++) {
1482 /* skip head and start with 1st element */
1483 fcp_rscn_element++;
1484 switch (fcp_rscn_element->addr_format) {
1485 case ZFCP_PORT_ADDRESS:
1486 ZFCP_LOG_FLAGS(1, "ZFCP_PORT_ADDRESS\n");
1487 range_mask = ZFCP_PORTS_RANGE_PORT;
1488 break;
1489 case ZFCP_AREA_ADDRESS:
1490 ZFCP_LOG_FLAGS(1, "ZFCP_AREA_ADDRESS\n");
1491 range_mask = ZFCP_PORTS_RANGE_AREA;
1492 break;
1493 case ZFCP_DOMAIN_ADDRESS:
1494 ZFCP_LOG_FLAGS(1, "ZFCP_DOMAIN_ADDRESS\n");
1495 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1496 break;
1497 case ZFCP_FABRIC_ADDRESS:
1498 ZFCP_LOG_FLAGS(1, "ZFCP_FABRIC_ADDRESS\n");
1499 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1500 break;
1501 default:
1502 ZFCP_LOG_INFO("incoming RSCN with unknown "
1503 "address format\n");
1504 continue;
1505 }
1506 read_lock_irqsave(&zfcp_data.config_lock, flags);
1507 list_for_each_entry(port, &adapter->port_list_head, list) {
1508 if (atomic_test_mask
1509 (ZFCP_STATUS_PORT_WKA, &port->status))
1510 continue;
1511 /* Do we know this port? If not skip it. */
1512 if (!atomic_test_mask
1513 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1514 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1515 "port 0x%016Lx\n", port->wwpn);
1516 debug_text_event(adapter->erp_dbf, 1,
1517 "unsol_els_rscnu:");
1518 zfcp_erp_port_reopen(port,
1519 ZFCP_STATUS_COMMON_ERP_FAILED);
1520 continue;
1521 }
1522
1523 /*
1524 * FIXME: race: d_id might being invalidated
1525 * (...DID_DID reset)
1526 */
1527 if ((port->d_id & range_mask)
1528 == (fcp_rscn_element->nport_did & range_mask)) {
1529 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1530 fcp_rscn_element->nport_did);
1531 /*
1532 * Unfortunately, an RSCN does not specify the
1533 * type of change a target underwent. We assume
1534 * that it makes sense to reopen the link.
1535 * FIXME: Shall we try to find out more about
1536 * the target and link state before closing it?
1537 * How to accomplish this? (nameserver?)
1538 * Where would such code be put in?
1539 * (inside or outside erp)
1540 */
1541 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1542 "port 0x%016Lx\n", port->wwpn);
1543 debug_text_event(adapter->erp_dbf, 1,
1544 "unsol_els_rscnk:");
1545 zfcp_test_link(port);
1546 }
1547 }
1548 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1549 }
1550 }
1551
1552 static void
1553 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1554 struct fsf_status_read_buffer *status_buffer)
1555 {
1556 logi *els_logi = (logi *) status_buffer->payload;
1557 struct zfcp_port *port;
1558 unsigned long flags;
1559
1560 zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
1561
1562 read_lock_irqsave(&zfcp_data.config_lock, flags);
1563 list_for_each_entry(port, &adapter->port_list_head, list) {
1564 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1565 break;
1566 }
1567 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1568
1569 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1570 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1571 "with d_id 0x%08x on adapter %s\n",
1572 status_buffer->d_id,
1573 zfcp_get_busid_by_adapter(adapter));
1574 } else {
1575 debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
1576 debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
1577 zfcp_erp_port_forced_reopen(port, 0);
1578 }
1579 }
1580
1581 static void
1582 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1583 struct fsf_status_read_buffer *status_buffer)
1584 {
1585 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1586 struct zfcp_port *port;
1587 unsigned long flags;
1588
1589 zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
1590
1591 read_lock_irqsave(&zfcp_data.config_lock, flags);
1592 list_for_each_entry(port, &adapter->port_list_head, list) {
1593 if (port->wwpn == els_logo->nport_wwpn)
1594 break;
1595 }
1596 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1597
1598 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1599 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1600 "with d_id 0x%08x on adapter %s\n",
1601 status_buffer->d_id,
1602 zfcp_get_busid_by_adapter(adapter));
1603 } else {
1604 debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
1605 debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
1606 zfcp_erp_port_forced_reopen(port, 0);
1607 }
1608 }
1609
1610 static void
1611 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1612 struct fsf_status_read_buffer *status_buffer)
1613 {
1614 zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
1615 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1616 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1617 zfcp_get_busid_by_adapter(adapter));
1618
1619 }
1620
1621 void
1622 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1623 {
1624 struct fsf_status_read_buffer *status_buffer;
1625 u32 els_type;
1626 struct zfcp_adapter *adapter;
1627
1628 status_buffer = fsf_req->data.status_read.buffer;
1629 els_type = *(u32 *) (status_buffer->payload);
1630 adapter = fsf_req->adapter;
1631
1632 if (els_type == LS_PLOGI)
1633 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1634 else if (els_type == LS_LOGO)
1635 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1636 else if ((els_type & 0xffff0000) == LS_RSCN)
1637 /* we are only concerned with the command, not the length */
1638 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1639 else
1640 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1641 }
1642
1643
1644 /**
1645 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1646 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1647 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1648 */
1649 static int
1650 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1651 {
1652 struct zfcp_gid_pn_data *data;
1653
1654 if (pool != NULL) {
1655 data = mempool_alloc(pool, GFP_ATOMIC);
1656 if (likely(data != NULL)) {
1657 data->ct.pool = pool;
1658 }
1659 } else {
1660 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1661 }
1662
1663 if (NULL == data)
1664 return -ENOMEM;
1665
1666 memset(data, 0, sizeof(*data));
1667 data->ct.req = &data->req;
1668 data->ct.resp = &data->resp;
1669 data->ct.req_count = data->ct.resp_count = 1;
1670 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1671 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1672 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1673 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1674
1675 *gid_pn = data;
1676 return 0;
1677 }
1678
1679 /**
1680 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1681 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1682 */
1683 static void
1684 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1685 {
1686 if ((gid_pn->ct.pool != 0))
1687 mempool_free(gid_pn, gid_pn->ct.pool);
1688 else
1689 kfree(gid_pn);
1690
1691 return;
1692 }
1693
1694 /**
1695 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1696 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1697 */
1698 int
1699 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1700 {
1701 int ret;
1702 struct ct_iu_gid_pn_req *ct_iu_req;
1703 struct zfcp_gid_pn_data *gid_pn;
1704 struct zfcp_adapter *adapter = erp_action->adapter;
1705
1706 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1707 if (ret < 0) {
1708 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1709 "request failed for adapter %s\n",
1710 zfcp_get_busid_by_adapter(adapter));
1711 goto out;
1712 }
1713
1714 /* setup nameserver request */
1715 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1716 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1717 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1718 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1719 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1720 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1721 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1722 ct_iu_req->wwpn = erp_action->port->wwpn;
1723
1724 /* setup parameters for send generic command */
1725 gid_pn->ct.port = adapter->nameserver_port;
1726 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1727 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1728 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1729 gid_pn->ct.timer = &erp_action->timer;
1730 gid_pn->port = erp_action->port;
1731
1732 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1733 erp_action);
1734 if (ret) {
1735 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1736 "failed for adapter %s\n",
1737 zfcp_get_busid_by_adapter(adapter));
1738
1739 zfcp_gid_pn_buffers_free(gid_pn);
1740 }
1741
1742 out:
1743 return ret;
1744 }
1745
1746 /**
1747 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1748 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1749 */
1750 static void zfcp_ns_gid_pn_handler(unsigned long data)
1751 {
1752 struct zfcp_port *port;
1753 struct zfcp_send_ct *ct;
1754 struct ct_iu_gid_pn_req *ct_iu_req;
1755 struct ct_iu_gid_pn_resp *ct_iu_resp;
1756 struct zfcp_gid_pn_data *gid_pn;
1757
1758
1759 gid_pn = (struct zfcp_gid_pn_data *) data;
1760 port = gid_pn->port;
1761 ct = &gid_pn->ct;
1762 ct_iu_req = zfcp_sg_to_address(ct->req);
1763 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1764
1765 if ((ct->status != 0) || zfcp_check_ct_response(&ct_iu_resp->header)) {
1766 /* FIXME: do we need some specific erp entry points */
1767 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1768 goto failed;
1769 }
1770 /* paranoia */
1771 if (ct_iu_req->wwpn != port->wwpn) {
1772 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1773 "lookup does not match expected wwpn 0x%016Lx "
1774 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1775 zfcp_get_busid_by_port(port));
1776 goto mismatch;
1777 }
1778
1779 /* looks like a valid d_id */
1780 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1781 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1782 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1783 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1784 goto out;
1785
1786 mismatch:
1787 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1788 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1789 sizeof(struct ct_iu_gid_pn_req));
1790 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1791 sizeof(struct ct_iu_gid_pn_resp));
1792
1793 failed:
1794 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1795 "0x%016Lx for adapter %s\n",
1796 port->wwpn, zfcp_get_busid_by_port(port));
1797 out:
1798 zfcp_gid_pn_buffers_free(gid_pn);
1799 return;
1800 }
1801
1802 /* reject CT_IU reason codes acc. to FC-GS-4 */
1803 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1804 {0x01, "invalid command code"},
1805 {0x02, "invalid version level"},
1806 {0x03, "logical error"},
1807 {0x04, "invalid CT_IU size"},
1808 {0x05, "logical busy"},
1809 {0x07, "protocol error"},
1810 {0x09, "unable to perform command request"},
1811 {0x0b, "command not supported"},
1812 {0x0d, "server not available"},
1813 {0x0e, "session could not be established"},
1814 {0xff, "vendor specific error"},
1815 {0, NULL},
1816 };
1817
1818 /* LS_RJT reason codes acc. to FC-FS */
1819 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1820 {0x01, "invalid LS_Command code"},
1821 {0x03, "logical error"},
1822 {0x05, "logical busy"},
1823 {0x07, "protocol error"},
1824 {0x09, "unable to perform command request"},
1825 {0x0b, "command not supported"},
1826 {0x0e, "command already in progress"},
1827 {0xff, "vendor specific error"},
1828 {0, NULL},
1829 };
1830
1831 /* reject reason codes according to FC-PH/FC-FS */
1832 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1833 {0x01, "invalid D_ID"},
1834 {0x02, "invalid S_ID"},
1835 {0x03, "Nx_Port not available, temporary"},
1836 {0x04, "Nx_Port not available, permament"},
1837 {0x05, "class not supported"},
1838 {0x06, "delimiter usage error"},
1839 {0x07, "TYPE not supported"},
1840 {0x08, "invalid Link_Control"},
1841 {0x09, "invalid R_CTL field"},
1842 {0x0a, "invalid F_CTL field"},
1843 {0x0b, "invalid OX_ID"},
1844 {0x0c, "invalid RX_ID"},
1845 {0x0d, "invalid SEQ_ID"},
1846 {0x0e, "invalid DF_CTL"},
1847 {0x0f, "invalid SEQ_CNT"},
1848 {0x10, "invalid parameter field"},
1849 {0x11, "exchange error"},
1850 {0x12, "protocol error"},
1851 {0x13, "incorrect length"},
1852 {0x14, "unsupported ACK"},
1853 {0x15, "class of service not supported by entity at FFFFFE"},
1854 {0x16, "login required"},
1855 {0x17, "excessive sequences attempted"},
1856 {0x18, "unable to establish exchange"},
1857 {0x1a, "fabric path not available"},
1858 {0x1b, "invalid VC_ID (class 4)"},
1859 {0x1c, "invalid CS_CTL field"},
1860 {0x1d, "insufficient resources for VC (class 4)"},
1861 {0x1f, "invalid class of service"},
1862 {0x20, "preemption request rejected"},
1863 {0x21, "preemption not enabled"},
1864 {0x22, "multicast error"},
1865 {0x23, "multicast error terminate"},
1866 {0x24, "process login required"},
1867 {0xff, "vendor specific reject"},
1868 {0, NULL},
1869 };
1870
1871 /**
1872 * zfcp_rc_description - return description for given reaon code
1873 * @code: reason code
1874 * @rc_table: table of reason codes and descriptions
1875 */
1876 static inline const char *
1877 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1878 {
1879 const char *descr = "unknown reason code";
1880
1881 do {
1882 if (code == rc_table->code) {
1883 descr = rc_table->description;
1884 break;
1885 }
1886 rc_table++;
1887 } while (rc_table->code && rc_table->description);
1888
1889 return descr;
1890 }
1891
1892 /**
1893 * zfcp_check_ct_response - evaluate reason code for CT_IU
1894 * @rjt: response payload to an CT_IU request
1895 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1896 */
1897 int
1898 zfcp_check_ct_response(struct ct_hdr *rjt)
1899 {
1900 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1901 return 0;
1902
1903 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1904 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1905 "response code (0x%04hx)\n",
1906 rjt->cmd_rsp_code);
1907 return 1;
1908 }
1909
1910 ZFCP_LOG_INFO("Generic Service command rejected\n");
1911 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1912 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1913 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1914 (u32) rjt->vendor_unique);
1915
1916 return 1;
1917 }
1918
1919 /**
1920 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1921 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1922 * @rc_table: table of reason codes and descriptions
1923 */
1924 static inline void
1925 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1926 const struct zfcp_rc_entry *rc_table)
1927 {
1928 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1929 zfcp_rc_description(rjt_par->reason_code, rc_table),
1930 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1931 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1932 }
1933
1934 /**
1935 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1936 * @sq: status qualifier word
1937 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1938 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1939 */
1940 int
1941 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1942 {
1943 int ret = -EIO;
1944
1945 if (sq == FSF_IOSTAT_NPORT_RJT) {
1946 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1947 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1948 /* invalid d_id */
1949 if (rjt_par->reason_code == 0x01)
1950 ret = -EREMCHG;
1951 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1952 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1953 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1954 /* invalid d_id */
1955 if (rjt_par->reason_code == 0x01)
1956 ret = -EREMCHG;
1957 } else if (sq == FSF_IOSTAT_LS_RJT) {
1958 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1959 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1960 ret = -EREMOTEIO;
1961 } else
1962 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1963
1964 return ret;
1965 }
1966
1967 #undef ZFCP_LOG_AREA
Linux kernel - Deliverables
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