projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Linux-2.6.12-rc2
[deliverable/linux.git] / drivers / s390 / scsi / zfcp_aux.c
CommitLineData
1da177e4
LT		 1/*
2 *
3 * linux/drivers/s390/scsi/zfcp_aux.c
4 *
5 * FCP adapter driver for IBM eServer zSeries
6 *
7 * (C) Copyright IBM Corp. 2002, 2004
8 *
9 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
10 * Raimund Schroeder <raimund.schroeder@de.ibm.com>
11 * Aron Zeh
12 * Wolfgang Taphorn
13 * Stefan Bader <stefan.bader@de.ibm.com>
14 * Heiko Carstens <heiko.carstens@de.ibm.com>
15 * Andreas Herrmann <aherrman@de.ibm.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2, or (at your option)
20 * any later version.
21 *
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
26 *
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 */
31
32#define ZFCP_AUX_REVISION "$Revision: 1.145 $"
33
34#include "zfcp_ext.h"
35
36/* accumulated log level (module parameter) */
37static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
38static char *device;
39/*********************** FUNCTION PROTOTYPES *********************************/
40
41/* written against the module interface */
42static int __init zfcp_module_init(void);
43
44/* FCP related */
45static void zfcp_ns_gid_pn_handler(unsigned long);
46
47/* miscellaneous */
48static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
49static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
50static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
51 void __user *, size_t);
52static inline int zfcp_sg_list_copy_to_user(void __user *,
53 struct zfcp_sg_list *, size_t);
54
55static int zfcp_cfdc_dev_ioctl(struct inode *, struct file *,
56 unsigned int, unsigned long);
57
58#define ZFCP_CFDC_IOC_MAGIC 0xDD
59#define ZFCP_CFDC_IOC \
60 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
61
62#ifdef CONFIG_COMPAT
63static struct ioctl_trans zfcp_ioctl_trans = {ZFCP_CFDC_IOC, (void*) sys_ioctl};
64#endif
65
66static struct file_operations zfcp_cfdc_fops = {
67 .ioctl = zfcp_cfdc_dev_ioctl
68};
69
70static struct miscdevice zfcp_cfdc_misc = {
71 .minor = ZFCP_CFDC_DEV_MINOR,
72 .name = ZFCP_CFDC_DEV_NAME,
73 .fops = &zfcp_cfdc_fops
74};
75
76/*********************** KERNEL/MODULE PARAMETERS ***************************/
77
78/* declare driver module init/cleanup functions */
79module_init(zfcp_module_init);
80
81MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
82 "Andreas Herrman <aherrman@de.ibm.com>, "
83 "Martin Peschke <mpeschke@de.ibm.com>, "
84 "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
85 "Wolfgang Taphorn <taphorn@de.ibm.com>, "
86 "Aron Zeh <arzeh@de.ibm.com>, "
87 "IBM Deutschland Entwicklung GmbH");
88MODULE_DESCRIPTION
89 ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
90MODULE_LICENSE("GPL");
91
92module_param(device, charp, 0);
93MODULE_PARM_DESC(device, "specify initial device");
94
95module_param(loglevel, uint, 0);
96MODULE_PARM_DESC(loglevel,
97 "log levels, 8 nibbles: "
98 "FC ERP QDIO CIO Config FSF SCSI Other, "
99 "levels: 0=none 1=normal 2=devel 3=trace");
100
101#ifdef ZFCP_PRINT_FLAGS
102u32 flags_dump = 0;
103module_param(flags_dump, uint, 0);
104#endif
105
106/****************************************************************/
107/************** Functions without logging ***********************/
108/****************************************************************/
109
110void
111_zfcp_hex_dump(char *addr, int count)
112{
113 int i;
114 for (i = 0; i < count; i++) {
115 printk("%02x", addr[i]);
116 if ((i % 4) == 3)
117 printk(" ");
118 if ((i % 32) == 31)
119 printk("\n");
120 }
121 if (((i-1) % 32) != 31)
122 printk("\n");
123}
124
125/****************************************************************/
126/************** Uncategorised Functions *************************/
127/****************************************************************/
128
129#define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
130
131static inline int
132zfcp_fsf_req_is_scsi_cmnd(struct zfcp_fsf_req *fsf_req)
133{
134 return ((fsf_req->fsf_command == FSF_QTCB_FCP_CMND) &&
135 !(fsf_req->status & ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT));
136}
137
138void
139zfcp_cmd_dbf_event_fsf(const char *text, struct zfcp_fsf_req *fsf_req,
140 void *add_data, int add_length)
141{
142 struct zfcp_adapter *adapter = fsf_req->adapter;
143 struct scsi_cmnd *scsi_cmnd;
144 int level = 3;
145 int i;
146 unsigned long flags;
147
148 spin_lock_irqsave(&adapter->dbf_lock, flags);
149 if (zfcp_fsf_req_is_scsi_cmnd(fsf_req)) {
150 scsi_cmnd = fsf_req->data.send_fcp_command_task.scsi_cmnd;
151 debug_text_event(adapter->cmd_dbf, level, "fsferror");
152 debug_text_event(adapter->cmd_dbf, level, text);
153 debug_event(adapter->cmd_dbf, level, &fsf_req,
154 sizeof (unsigned long));
155 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
156 sizeof (u32));
157 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
158 sizeof (unsigned long));
159 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
160 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
161 for (i = 0; i < add_length; i += ZFCP_CMD_DBF_LENGTH)
162 debug_event(adapter->cmd_dbf,
163 level,
164 (char *) add_data + i,
165 min(ZFCP_CMD_DBF_LENGTH, add_length - i));
166 }
167 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
168}
169
170/* XXX additionally log unit if available */
171/* ---> introduce new parameter for unit, see 2.4 code */
172void
173zfcp_cmd_dbf_event_scsi(const char *text, struct scsi_cmnd *scsi_cmnd)
174{
175 struct zfcp_adapter *adapter;
176 union zfcp_req_data *req_data;
177 struct zfcp_fsf_req *fsf_req;
178 int level = ((host_byte(scsi_cmnd->result) != 0) ? 1 : 5);
179 unsigned long flags;
180
181 adapter = (struct zfcp_adapter *) scsi_cmnd->device->host->hostdata[0];
182 req_data = (union zfcp_req_data *) scsi_cmnd->host_scribble;
183 fsf_req = (req_data ? req_data->send_fcp_command_task.fsf_req : NULL);
184 spin_lock_irqsave(&adapter->dbf_lock, flags);
185 debug_text_event(adapter->cmd_dbf, level, "hostbyte");
186 debug_text_event(adapter->cmd_dbf, level, text);
187 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->result, sizeof (u32));
188 debug_event(adapter->cmd_dbf, level, &scsi_cmnd,
189 sizeof (unsigned long));
190 debug_event(adapter->cmd_dbf, level, &scsi_cmnd->cmnd,
191 min(ZFCP_CMD_DBF_LENGTH, (int)scsi_cmnd->cmd_len));
192 if (likely(fsf_req)) {
193 debug_event(adapter->cmd_dbf, level, &fsf_req,
194 sizeof (unsigned long));
195 debug_event(adapter->cmd_dbf, level, &fsf_req->seq_no,
196 sizeof (u32));
197 } else {
198 debug_text_event(adapter->cmd_dbf, level, "");
199 debug_text_event(adapter->cmd_dbf, level, "");
200 }
201 spin_unlock_irqrestore(&adapter->dbf_lock, flags);
202}
203
204void
205zfcp_in_els_dbf_event(struct zfcp_adapter *adapter, const char *text,
206 struct fsf_status_read_buffer *status_buffer, int length)
207{
208 int level = 1;
209 int i;
210
211 debug_text_event(adapter->in_els_dbf, level, text);
212 debug_event(adapter->in_els_dbf, level, &status_buffer->d_id, 8);
213 for (i = 0; i < length; i += ZFCP_IN_ELS_DBF_LENGTH)
214 debug_event(adapter->in_els_dbf,
215 level,
216 (char *) status_buffer->payload + i,
217 min(ZFCP_IN_ELS_DBF_LENGTH, length - i));
218}
219
220/**
221 * zfcp_device_setup - setup function
222 * @str: pointer to parameter string
223 *
224 * Parse "device=..." parameter string.
225 */
226static int __init
227zfcp_device_setup(char *str)
228{
229 char *tmp;
230
231 if (!str)
232 return 0;
233
234 tmp = strchr(str, ',');
235 if (!tmp)
236 goto err_out;
237 *tmp++ = '\0';
238 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
239 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
240
241 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
242 if (*tmp++ != ',')
243 goto err_out;
244 if (*tmp == '\0')
245 goto err_out;
246
247 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
248 if (*tmp != '\0')
249 goto err_out;
250 return 1;
251
252 err_out:
253 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
254 return 0;
255}
256
257static void __init
258zfcp_init_device_configure(void)
259{
260 struct zfcp_adapter *adapter;
261 struct zfcp_port *port;
262 struct zfcp_unit *unit;
263
264 down(&zfcp_data.config_sema);
265 read_lock_irq(&zfcp_data.config_lock);
266 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
267 if (adapter)
268 zfcp_adapter_get(adapter);
269 read_unlock_irq(&zfcp_data.config_lock);
270
271 if (adapter == NULL)
272 goto out_adapter;
273 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
274 if (!port)
275 goto out_port;
276 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
277 if (!unit)
278 goto out_unit;
279 up(&zfcp_data.config_sema);
280 ccw_device_set_online(adapter->ccw_device);
281 zfcp_erp_wait(adapter);
282 down(&zfcp_data.config_sema);
283 zfcp_unit_put(unit);
284 out_unit:
285 zfcp_port_put(port);
286 out_port:
287 zfcp_adapter_put(adapter);
288 out_adapter:
289 up(&zfcp_data.config_sema);
290 return;
291}
292
293static int __init
294zfcp_module_init(void)
295{
296
297 int retval = 0;
298
299 atomic_set(&zfcp_data.loglevel, loglevel);
300
301 /* initialize adapter list */
302 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
303
304 /* initialize adapters to be removed list head */
305 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
306
307 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
308 if (!zfcp_transport_template)
309 return -ENODEV;
310
311 retval = register_ioctl32_conversion(zfcp_ioctl_trans.cmd,
312 zfcp_ioctl_trans.handler);
313 if (retval != 0) {
314 ZFCP_LOG_INFO("registration of ioctl32 conversion failed\n");
315 goto out;
316 }
317
318 retval = misc_register(&zfcp_cfdc_misc);
319 if (retval != 0) {
320 ZFCP_LOG_INFO("registration of misc device "
321 "zfcp_cfdc failed\n");
322 goto out_misc_register;
323 } else {
324 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
325 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
326 }
327
328 /* Initialise proc semaphores */
329 sema_init(&zfcp_data.config_sema, 1);
330
331 /* initialise configuration rw lock */
332 rwlock_init(&zfcp_data.config_lock);
333
334 /* save address of data structure managing the driver module */
335 zfcp_data.scsi_host_template.module = THIS_MODULE;
336
337 /* setup dynamic I/O */
338 retval = zfcp_ccw_register();
339 if (retval) {
340 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
341 goto out_ccw_register;
342 }
343
344 if (zfcp_device_setup(device))
345 zfcp_init_device_configure();
346
347 goto out;
348
349 out_ccw_register:
350 misc_deregister(&zfcp_cfdc_misc);
351 out_misc_register:
352 unregister_ioctl32_conversion(zfcp_ioctl_trans.cmd);
353 out:
354 return retval;
355}
356
357/*
358 * function: zfcp_cfdc_dev_ioctl
359 *
360 * purpose: Handle control file upload/download transaction via IOCTL
361 * interface
362 *
363 * returns: 0 - Operation completed successfuly
364 * -ENOTTY - Unknown IOCTL command
365 * -EINVAL - Invalid sense data record
366 * -ENXIO - The FCP adapter is not available
367 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
368 * -ENOMEM - Insufficient memory
369 * -EFAULT - User space memory I/O operation fault
370 * -EPERM - Cannot create or queue FSF request or create SBALs
371 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
372 */
373static int
374zfcp_cfdc_dev_ioctl(struct inode *inode, struct file *file,
375 unsigned int command, unsigned long buffer)
376{
377 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
378 struct zfcp_adapter *adapter = NULL;
379 struct zfcp_fsf_req *fsf_req = NULL;
380 struct zfcp_sg_list *sg_list = NULL;
381 u32 fsf_command, option;
382 char *bus_id = NULL;
383 int retval = 0;
384
385 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
386 if (sense_data == NULL) {
387 retval = -ENOMEM;
388 goto out;
389 }
390
391 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
392 if (sg_list == NULL) {
393 retval = -ENOMEM;
394 goto out;
395 }
396 memset(sg_list, 0, sizeof(*sg_list));
397
398 if (command != ZFCP_CFDC_IOC) {
399 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
400 retval = -ENOTTY;
401 goto out;
402 }
403
404 if ((sense_data_user = (void __user *) buffer) == NULL) {
405 ZFCP_LOG_INFO("sense data record is required\n");
406 retval = -EINVAL;
407 goto out;
408 }
409
410 retval = copy_from_user(sense_data, sense_data_user,
411 sizeof(struct zfcp_cfdc_sense_data));
412 if (retval) {
413 retval = -EFAULT;
414 goto out;
415 }
416
417 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
418 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
419 ZFCP_CFDC_SIGNATURE);
420 retval = -EINVAL;
421 goto out;
422 }
423
424 switch (sense_data->command) {
425
426 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
427 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
428 option = FSF_CFDC_OPTION_NORMAL_MODE;
429 break;
430
431 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
432 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
433 option = FSF_CFDC_OPTION_FORCE;
434 break;
435
436 case ZFCP_CFDC_CMND_FULL_ACCESS:
437 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
438 option = FSF_CFDC_OPTION_FULL_ACCESS;
439 break;
440
441 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
442 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
443 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
444 break;
445
446 case ZFCP_CFDC_CMND_UPLOAD:
447 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
448 option = 0;
449 break;
450
451 default:
452 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
453 sense_data->command);
454 retval = -EINVAL;
455 goto out;
456 }
457
458 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
459 if (bus_id == NULL) {
460 retval = -ENOMEM;
461 goto out;
462 }
463 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
464 (sense_data->devno >> 24),
465 (sense_data->devno >> 16) & 0xFF,
466 (sense_data->devno & 0xFFFF));
467
468 read_lock_irq(&zfcp_data.config_lock);
469 adapter = zfcp_get_adapter_by_busid(bus_id);
470 if (adapter)
471 zfcp_adapter_get(adapter);
472 read_unlock_irq(&zfcp_data.config_lock);
473
474 kfree(bus_id);
475
476 if (adapter == NULL) {
477 ZFCP_LOG_INFO("invalid adapter\n");
478 retval = -ENXIO;
479 goto out;
480 }
481
482 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
483 retval = zfcp_sg_list_alloc(sg_list,
484 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
485 if (retval) {
486 retval = -ENOMEM;
487 goto out;
488 }
489 }
490
491 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
492 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
493 retval = zfcp_sg_list_copy_from_user(
494 sg_list, &sense_data_user->control_file,
495 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
496 if (retval) {
497 retval = -EFAULT;
498 goto out;
499 }
500 }
501
502 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
503 option, sg_list);
504 if (retval)
505 goto out;
506
507 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
508 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
509 retval = -ENXIO;
510 goto out;
511 }
512
513 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
514 memcpy(&sense_data->fsf_status_qual,
515 &fsf_req->qtcb->header.fsf_status_qual,
516 sizeof(union fsf_status_qual));
517 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
518
519 retval = copy_to_user(sense_data_user, sense_data,
520 sizeof(struct zfcp_cfdc_sense_data));
521 if (retval) {
522 retval = -EFAULT;
523 goto out;
524 }
525
526 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
527 retval = zfcp_sg_list_copy_to_user(
528 &sense_data_user->control_file, sg_list,
529 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
530 if (retval) {
531 retval = -EFAULT;
532 goto out;
533 }
534 }
535
536 out:
537 if (fsf_req != NULL)
538 zfcp_fsf_req_cleanup(fsf_req);
539
540 if ((adapter != NULL) && (retval != -ENXIO))
541 zfcp_adapter_put(adapter);
542
543 if (sg_list != NULL) {
544 zfcp_sg_list_free(sg_list);
545 kfree(sg_list);
546 }
547
548 if (sense_data != NULL)
549 kfree(sense_data);
550
551 return retval;
552}
553
554
555/**
556 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
557 * @sg_list: structure describing a scatter gather list
558 * @size: size of scatter-gather list
559 * Return: 0 on success, else -ENOMEM
560 *
561 * In sg_list->sg a pointer to the created scatter-gather list is returned,
562 * or NULL if we run out of memory. sg_list->count specifies the number of
563 * elements of the scatter-gather list. The maximum size of a single element
564 * in the scatter-gather list is PAGE_SIZE.
565 */
566static inline int
567zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
568{
569 struct scatterlist *sg;
570 unsigned int i;
571 int retval = 0;
572 void *address;
573
574 BUG_ON(sg_list == NULL);
575
576 sg_list->count = size >> PAGE_SHIFT;
577 if (size & ~PAGE_MASK)
578 sg_list->count++;
579 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
580 GFP_KERNEL);
581 if (sg_list->sg == NULL) {
582 sg_list->count = 0;
583 retval = -ENOMEM;
584 goto out;
585 }
586 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
587
588 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
589 sg->length = min(size, PAGE_SIZE);
590 sg->offset = 0;
591 address = (void *) get_zeroed_page(GFP_KERNEL);
592 if (address == NULL) {
593 sg_list->count = i;
594 zfcp_sg_list_free(sg_list);
595 retval = -ENOMEM;
596 goto out;
597 }
598 zfcp_address_to_sg(address, sg);
599 size -= sg->length;
600 }
601
602 out:
603 return retval;
604}
605
606
607/**
608 * zfcp_sg_list_free - free memory of a scatter-gather list
609 * @sg_list: structure describing a scatter-gather list
610 *
611 * Memory for each element in the scatter-gather list is freed.
612 * Finally sg_list->sg is freed itself and sg_list->count is reset.
613 */
614static inline void
615zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
616{
617 struct scatterlist *sg;
618 unsigned int i;
619
620 BUG_ON(sg_list == NULL);
621
622 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
623 free_page((unsigned long) zfcp_sg_to_address(sg));
624
625 sg_list->count = 0;
626 kfree(sg_list->sg);
627}
628
629/**
630 * zfcp_sg_size - determine size of a scatter-gather list
631 * @sg: array of (struct scatterlist)
632 * @sg_count: elements in array
633 * Return: size of entire scatter-gather list
634 */
635size_t
636zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
637{
638 unsigned int i;
639 struct scatterlist *p;
640 size_t size;
641
642 size = 0;
643 for (i = 0, p = sg; i < sg_count; i++, p++) {
644 BUG_ON(p == NULL);
645 size += p->length;
646 }
647
648 return size;
649}
650
651
652/**
653 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
654 * @sg_list: structure describing a scatter-gather list
655 * @user_buffer: pointer to buffer in user space
656 * @size: number of bytes to be copied
657 * Return: 0 on success, -EFAULT if copy_from_user fails.
658 */
659static inline int
660zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
661 void __user *user_buffer,
662 size_t size)
663{
664 struct scatterlist *sg;
665 unsigned int length;
666 void *zfcp_buffer;
667 int retval = 0;
668
669 BUG_ON(sg_list == NULL);
670
671 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
672 return -EFAULT;
673
674 for (sg = sg_list->sg; size > 0; sg++) {
675 length = min((unsigned int)size, sg->length);
676 zfcp_buffer = zfcp_sg_to_address(sg);
677 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
678 retval = -EFAULT;
679 goto out;
680 }
681 user_buffer += length;
682 size -= length;
683 }
684
685 out:
686 return retval;
687}
688
689
690/**
691 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
692 * @user_buffer: pointer to buffer in user space
693 * @sg_list: structure describing a scatter-gather list
694 * @size: number of bytes to be copied
695 * Return: 0 on success, -EFAULT if copy_to_user fails
696 */
697static inline int
698zfcp_sg_list_copy_to_user(void __user *user_buffer,
699 struct zfcp_sg_list *sg_list,
700 size_t size)
701{
702 struct scatterlist *sg;
703 unsigned int length;
704 void *zfcp_buffer;
705 int retval = 0;
706
707 BUG_ON(sg_list == NULL);
708
709 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
710 return -EFAULT;
711
712 for (sg = sg_list->sg; size > 0; sg++) {
713 length = min((unsigned int) size, sg->length);
714 zfcp_buffer = zfcp_sg_to_address(sg);
715 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
716 retval = -EFAULT;
717 goto out;
718 }
719 user_buffer += length;
720 size -= length;
721 }
722
723 out:
724 return retval;
725}
726
727
728#undef ZFCP_LOG_AREA
729
730/****************************************************************/
731/****** Functions for configuration/set-up of structures ********/
732/****************************************************************/
733
734#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
735
736/**
737 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
738 * @port: pointer to port to search for unit
739 * @fcp_lun: FCP LUN to search for
740 * Traverse list of all units of a port and return pointer to a unit
741 * with the given FCP LUN.
742 */
743struct zfcp_unit *
744zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
745{
746 struct zfcp_unit *unit;
747 int found = 0;
748
749 list_for_each_entry(unit, &port->unit_list_head, list) {
750 if ((unit->fcp_lun == fcp_lun) &&
751 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
752 {
753 found = 1;
754 break;
755 }
756 }
757 return found ? unit : NULL;
758}
759
760/**
761 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
762 * @adapter: pointer to adapter to search for port
763 * @wwpn: wwpn to search for
764 * Traverse list of all ports of an adapter and return pointer to a port
765 * with the given wwpn.
766 */
767struct zfcp_port *
768zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
769{
770 struct zfcp_port *port;
771 int found = 0;
772
773 list_for_each_entry(port, &adapter->port_list_head, list) {
774 if ((port->wwpn == wwpn) &&
775 !(atomic_read(&port->status) &
776 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
777 found = 1;
778 break;
779 }
780 }
781 return found ? port : NULL;
782}
783
784/**
785 * zfcp_get_port_by_did - find port in port list of adapter by d_id
786 * @adapter: pointer to adapter to search for port
787 * @d_id: d_id to search for
788 * Traverse list of all ports of an adapter and return pointer to a port
789 * with the given d_id.
790 */
791struct zfcp_port *
792zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
793{
794 struct zfcp_port *port;
795 int found = 0;
796
797 list_for_each_entry(port, &adapter->port_list_head, list) {
798 if ((port->d_id == d_id) &&
799 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
800 {
801 found = 1;
802 break;
803 }
804 }
805 return found ? port : NULL;
806}
807
808/**
809 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
810 * @bus_id: bus_id to search for
811 * Traverse list of all adapters and return pointer to an adapter
812 * with the given bus_id.
813 */
814struct zfcp_adapter *
815zfcp_get_adapter_by_busid(char *bus_id)
816{
817 struct zfcp_adapter *adapter;
818 int found = 0;
819
820 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
821 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
822 BUS_ID_SIZE) == 0) &&
823 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
824 &adapter->status)){
825 found = 1;
826 break;
827 }
828 }
829 return found ? adapter : NULL;
830}
831
832/**
833 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
834 * @port: pointer to port where unit is added
835 * @fcp_lun: FCP LUN of unit to be enqueued
836 * Return: pointer to enqueued unit on success, NULL on error
837 * Locks: config_sema must be held to serialize changes to the unit list
838 *
839 * Sets up some unit internal structures and creates sysfs entry.
840 */
841struct zfcp_unit *
842zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
843{
844 struct zfcp_unit *unit, *tmp_unit;
845 scsi_lun_t scsi_lun;
846 int found;
847
848 /*
849 * check that there is no unit with this FCP_LUN already in list
850 * and enqueue it.
851 * Note: Unlike for the adapter and the port, this is an error
852 */
853 read_lock_irq(&zfcp_data.config_lock);
854 unit = zfcp_get_unit_by_lun(port, fcp_lun);
855 read_unlock_irq(&zfcp_data.config_lock);
856 if (unit)
857 return NULL;
858
859 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
860 if (!unit)
861 return NULL;
862 memset(unit, 0, sizeof (struct zfcp_unit));
863
864 /* initialise reference count stuff */
865 atomic_set(&unit->refcount, 0);
866 init_waitqueue_head(&unit->remove_wq);
867
868 unit->port = port;
869 unit->fcp_lun = fcp_lun;
870
871 /* setup for sysfs registration */
872 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
873 unit->sysfs_device.parent = &port->sysfs_device;
874 unit->sysfs_device.release = zfcp_sysfs_unit_release;
875 dev_set_drvdata(&unit->sysfs_device, unit);
876
877 /* mark unit unusable as long as sysfs registration is not complete */
878 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
879
880 if (device_register(&unit->sysfs_device)) {
881 kfree(unit);
882 return NULL;
883 }
884
885 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
886 device_unregister(&unit->sysfs_device);
887 return NULL;
888 }
889
890 zfcp_unit_get(unit);
891
892 scsi_lun = 0;
893 found = 0;
894 write_lock_irq(&zfcp_data.config_lock);
895 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
896 if (tmp_unit->scsi_lun != scsi_lun) {
897 found = 1;
898 break;
899 }
900 scsi_lun++;
901 }
902 unit->scsi_lun = scsi_lun;
903 if (found)
904 list_add_tail(&unit->list, &tmp_unit->list);
905 else
906 list_add_tail(&unit->list, &port->unit_list_head);
907 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
908 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
909 write_unlock_irq(&zfcp_data.config_lock);
910
911 port->units++;
912 zfcp_port_get(port);
913
914 return unit;
915}
916
917void
918zfcp_unit_dequeue(struct zfcp_unit *unit)
919{
920 zfcp_unit_wait(unit);
921 write_lock_irq(&zfcp_data.config_lock);
922 list_del(&unit->list);
923 write_unlock_irq(&zfcp_data.config_lock);
924 unit->port->units--;
925 zfcp_port_put(unit->port);
926 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
927 device_unregister(&unit->sysfs_device);
928}
929
930static void *
931zfcp_mempool_alloc(unsigned int __nocast gfp_mask, void *size)
932{
933 return kmalloc((size_t) size, gfp_mask);
934}
935
936static void
937zfcp_mempool_free(void *element, void *size)
938{
939 kfree(element);
940}
941
942/*
943 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
944 * commands.
945 * It also genrates fcp-nameserver request/response buffer and unsolicited
946 * status read fsf_req buffers.
947 *
948 * locks: must only be called with zfcp_data.config_sema taken
949 */
950static int
951zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
952{
953 adapter->pool.fsf_req_erp =
954 mempool_create(ZFCP_POOL_FSF_REQ_ERP_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_erp)
959 return -ENOMEM;
960
961 adapter->pool.fsf_req_scsi =
962 mempool_create(ZFCP_POOL_FSF_REQ_SCSI_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_scsi)
967 return -ENOMEM;
968
969 adapter->pool.fsf_req_abort =
970 mempool_create(ZFCP_POOL_FSF_REQ_ABORT_NR,
971 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
972 sizeof(struct zfcp_fsf_req_pool_element));
973
974 if (NULL == adapter->pool.fsf_req_abort)
975 return -ENOMEM;
976
977 adapter->pool.fsf_req_status_read =
978 mempool_create(ZFCP_POOL_STATUS_READ_NR,
979 zfcp_mempool_alloc, zfcp_mempool_free,
980 (void *) sizeof(struct zfcp_fsf_req));
981
982 if (NULL == adapter->pool.fsf_req_status_read)
983 return -ENOMEM;
984
985 adapter->pool.data_status_read =
986 mempool_create(ZFCP_POOL_STATUS_READ_NR,
987 zfcp_mempool_alloc, zfcp_mempool_free,
988 (void *) sizeof(struct fsf_status_read_buffer));
989
990 if (NULL == adapter->pool.data_status_read)
991 return -ENOMEM;
992
993 adapter->pool.data_gid_pn =
994 mempool_create(ZFCP_POOL_DATA_GID_PN_NR,
995 zfcp_mempool_alloc, zfcp_mempool_free, (void *)
996 sizeof(struct zfcp_gid_pn_data));
997
998 if (NULL == adapter->pool.data_gid_pn)
999 return -ENOMEM;
1000
1001 return 0;
1002}
1003
1004/**
1005 * zfcp_free_low_mem_buffers - free memory pools of an adapter
1006 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
1007 * locking: zfcp_data.config_sema must be held
1008 */
1009static void
1010zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1011{
1012 if (adapter->pool.fsf_req_erp)
1013 mempool_destroy(adapter->pool.fsf_req_erp);
1014 if (adapter->pool.fsf_req_scsi)
1015 mempool_destroy(adapter->pool.fsf_req_scsi);
1016 if (adapter->pool.fsf_req_abort)
1017 mempool_destroy(adapter->pool.fsf_req_abort);
1018 if (adapter->pool.fsf_req_status_read)
1019 mempool_destroy(adapter->pool.fsf_req_status_read);
1020 if (adapter->pool.data_status_read)
1021 mempool_destroy(adapter->pool.data_status_read);
1022 if (adapter->pool.data_gid_pn)
1023 mempool_destroy(adapter->pool.data_gid_pn);
1024}
1025
1026/**
1027 * zfcp_adapter_debug_register - registers debug feature for an adapter
1028 * @adapter: pointer to adapter for which debug features should be registered
1029 * return: -ENOMEM on error, 0 otherwise
1030 */
1031int
1032zfcp_adapter_debug_register(struct zfcp_adapter *adapter)
1033{
1034 char dbf_name[20];
1035
1036 /* debug feature area which records SCSI command failures (hostbyte) */
1037 spin_lock_init(&adapter->dbf_lock);
1038
1039 sprintf(dbf_name, ZFCP_CMD_DBF_NAME "%s",
1040 zfcp_get_busid_by_adapter(adapter));
1041 adapter->cmd_dbf = debug_register(dbf_name, ZFCP_CMD_DBF_INDEX,
1042 ZFCP_CMD_DBF_AREAS,
1043 ZFCP_CMD_DBF_LENGTH);
1044 debug_register_view(adapter->cmd_dbf, &debug_hex_ascii_view);
1045 debug_set_level(adapter->cmd_dbf, ZFCP_CMD_DBF_LEVEL);
1046
1047 /* debug feature area which records SCSI command aborts */
1048 sprintf(dbf_name, ZFCP_ABORT_DBF_NAME "%s",
1049 zfcp_get_busid_by_adapter(adapter));
1050 adapter->abort_dbf = debug_register(dbf_name, ZFCP_ABORT_DBF_INDEX,
1051 ZFCP_ABORT_DBF_AREAS,
1052 ZFCP_ABORT_DBF_LENGTH);
1053 debug_register_view(adapter->abort_dbf, &debug_hex_ascii_view);
1054 debug_set_level(adapter->abort_dbf, ZFCP_ABORT_DBF_LEVEL);
1055
1056 /* debug feature area which records incoming ELS commands */
1057 sprintf(dbf_name, ZFCP_IN_ELS_DBF_NAME "%s",
1058 zfcp_get_busid_by_adapter(adapter));
1059 adapter->in_els_dbf = debug_register(dbf_name, ZFCP_IN_ELS_DBF_INDEX,
1060 ZFCP_IN_ELS_DBF_AREAS,
1061 ZFCP_IN_ELS_DBF_LENGTH);
1062 debug_register_view(adapter->in_els_dbf, &debug_hex_ascii_view);
1063 debug_set_level(adapter->in_els_dbf, ZFCP_IN_ELS_DBF_LEVEL);
1064
1065 /* debug feature area which records erp events */
1066 sprintf(dbf_name, ZFCP_ERP_DBF_NAME "%s",
1067 zfcp_get_busid_by_adapter(adapter));
1068 adapter->erp_dbf = debug_register(dbf_name, ZFCP_ERP_DBF_INDEX,
1069 ZFCP_ERP_DBF_AREAS,
1070 ZFCP_ERP_DBF_LENGTH);
1071 debug_register_view(adapter->erp_dbf, &debug_hex_ascii_view);
1072 debug_set_level(adapter->erp_dbf, ZFCP_ERP_DBF_LEVEL);
1073
1074 if (!(adapter->cmd_dbf && adapter->abort_dbf &&
1075 adapter->in_els_dbf && adapter->erp_dbf)) {
1076 zfcp_adapter_debug_unregister(adapter);
1077 return -ENOMEM;
1078 }
1079
1080 return 0;
1081
1082}
1083
1084/**
1085 * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
1086 * @adapter: pointer to adapter for which debug features should be unregistered
1087 */
1088void
1089zfcp_adapter_debug_unregister(struct zfcp_adapter *adapter)
1090{
1091 debug_unregister(adapter->abort_dbf);
1092 debug_unregister(adapter->cmd_dbf);
1093 debug_unregister(adapter->erp_dbf);
1094 debug_unregister(adapter->in_els_dbf);
1095 adapter->abort_dbf = NULL;
1096 adapter->cmd_dbf = NULL;
1097 adapter->erp_dbf = NULL;
1098 adapter->in_els_dbf = NULL;
1099}
1100
1101void
1102zfcp_dummy_release(struct device *dev)
1103{
1104 return;
1105}
1106
1107/*
1108 * Enqueues an adapter at the end of the adapter list in the driver data.
1109 * All adapter internal structures are set up.
1110 * Proc-fs entries are also created.
1111 *
1112 * returns: 0 if a new adapter was successfully enqueued
1113 * ZFCP_KNOWN if an adapter with this devno was already present
1114 * -ENOMEM if alloc failed
1115 * locks: config_sema must be held to serialise changes to the adapter list
1116 */
1117struct zfcp_adapter *
1118zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1119{
1120 int retval = 0;
1121 struct zfcp_adapter *adapter;
1122
1123 /*
1124 * Note: It is safe to release the list_lock, as any list changes
1125 * are protected by the config_sema, which must be held to get here
1126 */
1127
1128 /* try to allocate new adapter data structure (zeroed) */
1129 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1130 if (!adapter) {
1131 ZFCP_LOG_INFO("error: allocation of base adapter "
1132 "structure failed\n");
1133 goto out;
1134 }
1135 memset(adapter, 0, sizeof (struct zfcp_adapter));
1136
1137 ccw_device->handler = NULL;
1138
1139 /* save ccw_device pointer */
1140 adapter->ccw_device = ccw_device;
1141
1142 retval = zfcp_qdio_allocate_queues(adapter);
1143 if (retval)
1144 goto queues_alloc_failed;
1145
1146 retval = zfcp_qdio_allocate(adapter);
1147 if (retval)
1148 goto qdio_allocate_failed;
1149
1150 retval = zfcp_allocate_low_mem_buffers(adapter);
1151 if (retval) {
1152 ZFCP_LOG_INFO("error: pool allocation failed\n");
1153 goto failed_low_mem_buffers;
1154 }
1155
1156 /* initialise reference count stuff */
1157 atomic_set(&adapter->refcount, 0);
1158 init_waitqueue_head(&adapter->remove_wq);
1159
1160 /* initialise list of ports */
1161 INIT_LIST_HEAD(&adapter->port_list_head);
1162
1163 /* initialise list of ports to be removed */
1164 INIT_LIST_HEAD(&adapter->port_remove_lh);
1165
1166 /* initialize list of fsf requests */
1167 rwlock_init(&adapter->fsf_req_list_lock);
1168 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
1169
1170 /* initialize abort lock */
1171 rwlock_init(&adapter->abort_lock);
1172
1173 /* initialise some erp stuff */
1174 init_waitqueue_head(&adapter->erp_thread_wqh);
1175 init_waitqueue_head(&adapter->erp_done_wqh);
1176
1177 /* initialize lock of associated request queue */
1178 rwlock_init(&adapter->request_queue.queue_lock);
1179
1180 /* intitialise SCSI ER timer */
1181 init_timer(&adapter->scsi_er_timer);
1182
1183 /* set FC service class used per default */
1184 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1185
1186 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1187 ASCEBC(adapter->name, strlen(adapter->name));
1188
1189 /* mark adapter unusable as long as sysfs registration is not complete */
1190 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1191
1192 adapter->ccw_device = ccw_device;
1193 dev_set_drvdata(&ccw_device->dev, adapter);
1194
1195 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1196 goto sysfs_failed;
1197
1198 adapter->generic_services.parent = &adapter->ccw_device->dev;
1199 adapter->generic_services.release = zfcp_dummy_release;
1200 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1201 "generic_services");
1202
1203 if (device_register(&adapter->generic_services))
1204 goto generic_services_failed;
1205
1206 /* put allocated adapter at list tail */
1207 write_lock_irq(&zfcp_data.config_lock);
1208 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1209 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1210 write_unlock_irq(&zfcp_data.config_lock);
1211
1212 zfcp_data.adapters++;
1213
1214 goto out;
1215
1216 generic_services_failed:
1217 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1218 sysfs_failed:
1219 dev_set_drvdata(&ccw_device->dev, NULL);
1220 failed_low_mem_buffers:
1221 zfcp_free_low_mem_buffers(adapter);
1222 if (qdio_free(ccw_device) != 0)
1223 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1224 zfcp_get_busid_by_adapter(adapter));
1225 qdio_allocate_failed:
1226 zfcp_qdio_free_queues(adapter);
1227 queues_alloc_failed:
1228 kfree(adapter);
1229 adapter = NULL;
1230 out:
1231 return adapter;
1232}
1233
1234/*
1235 * returns: 0 - struct zfcp_adapter data structure successfully removed
1236 * !0 - struct zfcp_adapter data structure could not be removed
1237 * (e.g. still used)
1238 * locks: adapter list write lock is assumed to be held by caller
1239 * adapter->fsf_req_list_lock is taken and released within this
1240 * function and must not be held on entry
1241 */
1242void
1243zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1244{
1245 int retval = 0;
1246 unsigned long flags;
1247
1248 device_unregister(&adapter->generic_services);
1249 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1250 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1251 /* sanity check: no pending FSF requests */
1252 read_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1253 retval = !list_empty(&adapter->fsf_req_list_head);
1254 read_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1255 if (retval) {
1256 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1257 "%i requests outstanding\n",
1258 zfcp_get_busid_by_adapter(adapter), adapter,
1259 atomic_read(&adapter->fsf_reqs_active));
1260 retval = -EBUSY;
1261 goto out;
1262 }
1263
1264 /* remove specified adapter data structure from list */
1265 write_lock_irq(&zfcp_data.config_lock);
1266 list_del(&adapter->list);
1267 write_unlock_irq(&zfcp_data.config_lock);
1268
1269 /* decrease number of adapters in list */
1270 zfcp_data.adapters--;
1271
1272 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1273 "%i adapters still in list\n",
1274 zfcp_get_busid_by_adapter(adapter),
1275 adapter, zfcp_data.adapters);
1276
1277 retval = qdio_free(adapter->ccw_device);
1278 if (retval)
1279 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1280 zfcp_get_busid_by_adapter(adapter));
1281
1282 zfcp_free_low_mem_buffers(adapter);
1283 /* free memory of adapter data structure and queues */
1284 zfcp_qdio_free_queues(adapter);
1285 ZFCP_LOG_TRACE("freeing adapter structure\n");
1286 kfree(adapter);
1287 out:
1288 return;
1289}
1290
1291/**
1292 * zfcp_port_enqueue - enqueue port to port list of adapter
1293 * @adapter: adapter where remote port is added
1294 * @wwpn: WWPN of the remote port to be enqueued
1295 * @status: initial status for the port
1296 * @d_id: destination id of the remote port to be enqueued
1297 * Return: pointer to enqueued port on success, NULL on error
1298 * Locks: config_sema must be held to serialize changes to the port list
1299 *
1300 * All port internal structures are set up and the sysfs entry is generated.
1301 * d_id is used to enqueue ports with a well known address like the Directory
1302 * Service for nameserver lookup.
1303 */
1304struct zfcp_port *
1305zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1306 u32 d_id)
1307{
1308 struct zfcp_port *port, *tmp_port;
1309 int check_wwpn;
1310 scsi_id_t scsi_id;
1311 int found;
1312
1313 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1314
1315 /*
1316 * check that there is no port with this WWPN already in list
1317 */
1318 if (check_wwpn) {
1319 read_lock_irq(&zfcp_data.config_lock);
1320 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1321 read_unlock_irq(&zfcp_data.config_lock);
1322 if (port)
1323 return NULL;
1324 }
1325
1326 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1327 if (!port)
1328 return NULL;
1329 memset(port, 0, sizeof (struct zfcp_port));
1330
1331 /* initialise reference count stuff */
1332 atomic_set(&port->refcount, 0);
1333 init_waitqueue_head(&port->remove_wq);
1334
1335 INIT_LIST_HEAD(&port->unit_list_head);
1336 INIT_LIST_HEAD(&port->unit_remove_lh);
1337
1338 port->adapter = adapter;
1339
1340 if (check_wwpn)
1341 port->wwpn = wwpn;
1342
1343 atomic_set_mask(status, &port->status);
1344
1345 /* setup for sysfs registration */
1346 if (status & ZFCP_STATUS_PORT_WKA) {
1347 switch (d_id) {
1348 case ZFCP_DID_DIRECTORY_SERVICE:
1349 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1350 "directory");
1351 break;
1352 case ZFCP_DID_MANAGEMENT_SERVICE:
1353 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1354 "management");
1355 break;
1356 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1357 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1358 "key_distribution");
1359 break;
1360 case ZFCP_DID_ALIAS_SERVICE:
1361 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1362 "alias");
1363 break;
1364 case ZFCP_DID_TIME_SERVICE:
1365 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1366 "time");
1367 break;
1368 default:
1369 kfree(port);
1370 return NULL;
1371 }
1372 port->d_id = d_id;
1373 port->sysfs_device.parent = &adapter->generic_services;
1374 } else {
1375 snprintf(port->sysfs_device.bus_id,
1376 BUS_ID_SIZE, "0x%016llx", wwpn);
1377 port->sysfs_device.parent = &adapter->ccw_device->dev;
1378 }
1379 port->sysfs_device.release = zfcp_sysfs_port_release;
1380 dev_set_drvdata(&port->sysfs_device, port);
1381
1382 /* mark port unusable as long as sysfs registration is not complete */
1383 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1384
1385 if (device_register(&port->sysfs_device)) {
1386 kfree(port);
1387 return NULL;
1388 }
1389
1390 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1391 device_unregister(&port->sysfs_device);
1392 return NULL;
1393 }
1394
1395 zfcp_port_get(port);
1396
1397 scsi_id = 1;
1398 found = 0;
1399 write_lock_irq(&zfcp_data.config_lock);
1400 list_for_each_entry(tmp_port, &adapter->port_list_head, list) {
1401 if (atomic_test_mask(ZFCP_STATUS_PORT_NO_SCSI_ID,
1402 &tmp_port->status))
1403 continue;
1404 if (tmp_port->scsi_id != scsi_id) {
1405 found = 1;
1406 break;
1407 }
1408 scsi_id++;
1409 }
1410 port->scsi_id = scsi_id;
1411 if (found)
1412 list_add_tail(&port->list, &tmp_port->list);
1413 else
1414 list_add_tail(&port->list, &adapter->port_list_head);
1415 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1416 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1417 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1418 if (!adapter->nameserver_port)
1419 adapter->nameserver_port = port;
1420 adapter->ports++;
1421 write_unlock_irq(&zfcp_data.config_lock);
1422
1423 zfcp_adapter_get(adapter);
1424
1425 return port;
1426}
1427
1428void
1429zfcp_port_dequeue(struct zfcp_port *port)
1430{
1431 zfcp_port_wait(port);
1432 write_lock_irq(&zfcp_data.config_lock);
1433 list_del(&port->list);
1434 port->adapter->ports--;
1435 write_unlock_irq(&zfcp_data.config_lock);
1436 zfcp_adapter_put(port->adapter);
1437 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1438 atomic_read(&port->status));
1439 device_unregister(&port->sysfs_device);
1440}
1441
1442/* Enqueues a nameserver port */
1443int
1444zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1445{
1446 struct zfcp_port *port;
1447
1448 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1449 ZFCP_DID_DIRECTORY_SERVICE);
1450 if (!port) {
1451 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1452 "adapter %s failed\n",
1453 zfcp_get_busid_by_adapter(adapter));
1454 return -ENXIO;
1455 }
1456 zfcp_port_put(port);
1457
1458 return 0;
1459}
1460
1461#undef ZFCP_LOG_AREA
1462
1463/****************************************************************/
1464/******* Fibre Channel Standard related Functions **************/
1465/****************************************************************/
1466
1467#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1468
1469void
1470zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1471 struct fsf_status_read_buffer *status_buffer)
1472{
1473 struct fcp_rscn_head *fcp_rscn_head;
1474 struct fcp_rscn_element *fcp_rscn_element;
1475 struct zfcp_port *port;
1476 u16 i;
1477 u16 no_entries;
1478 u32 range_mask;
1479 unsigned long flags;
1480
1481 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1482 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1483
1484 /* see FC-FS */
1485 no_entries = (fcp_rscn_head->payload_len / 4);
1486
1487 zfcp_in_els_dbf_event(adapter, "##rscn", status_buffer,
1488 fcp_rscn_head->payload_len);
1489
1490 debug_text_event(adapter->erp_dbf, 1, "unsol_els_rscn:");
1491 for (i = 1; i < no_entries; i++) {
1492 /* skip head and start with 1st element */
1493 fcp_rscn_element++;
1494 switch (fcp_rscn_element->addr_format) {
1495 case ZFCP_PORT_ADDRESS:
1496 ZFCP_LOG_FLAGS(1, "ZFCP_PORT_ADDRESS\n");
1497 range_mask = ZFCP_PORTS_RANGE_PORT;
1498 break;
1499 case ZFCP_AREA_ADDRESS:
1500 ZFCP_LOG_FLAGS(1, "ZFCP_AREA_ADDRESS\n");
1501 range_mask = ZFCP_PORTS_RANGE_AREA;
1502 break;
1503 case ZFCP_DOMAIN_ADDRESS:
1504 ZFCP_LOG_FLAGS(1, "ZFCP_DOMAIN_ADDRESS\n");
1505 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1506 break;
1507 case ZFCP_FABRIC_ADDRESS:
1508 ZFCP_LOG_FLAGS(1, "ZFCP_FABRIC_ADDRESS\n");
1509 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1510 break;
1511 default:
1512 ZFCP_LOG_INFO("incoming RSCN with unknown "
1513 "address format\n");
1514 continue;
1515 }
1516 read_lock_irqsave(&zfcp_data.config_lock, flags);
1517 list_for_each_entry(port, &adapter->port_list_head, list) {
1518 if (atomic_test_mask
1519 (ZFCP_STATUS_PORT_WKA, &port->status))
1520 continue;
1521 /* Do we know this port? If not skip it. */
1522 if (!atomic_test_mask
1523 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1524 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1525 "port 0x%016Lx\n", port->wwpn);
1526 debug_text_event(adapter->erp_dbf, 1,
1527 "unsol_els_rscnu:");
1528 zfcp_erp_port_reopen(port,
1529 ZFCP_STATUS_COMMON_ERP_FAILED);
1530 continue;
1531 }
1532
1533 /*
1534 * FIXME: race: d_id might being invalidated
1535 * (...DID_DID reset)
1536 */
1537 if ((port->d_id & range_mask)
1538 == (fcp_rscn_element->nport_did & range_mask)) {
1539 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1540 fcp_rscn_element->nport_did);
1541 /*
1542 * Unfortunately, an RSCN does not specify the
1543 * type of change a target underwent. We assume
1544 * that it makes sense to reopen the link.
1545 * FIXME: Shall we try to find out more about
1546 * the target and link state before closing it?
1547 * How to accomplish this? (nameserver?)
1548 * Where would such code be put in?
1549 * (inside or outside erp)
1550 */
1551 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1552 "port 0x%016Lx\n", port->wwpn);
1553 debug_text_event(adapter->erp_dbf, 1,
1554 "unsol_els_rscnk:");
1555 zfcp_test_link(port);
1556 }
1557 }
1558 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1559 }
1560}
1561
1562static void
1563zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1564 struct fsf_status_read_buffer *status_buffer)
1565{
1566 logi *els_logi = (logi *) status_buffer->payload;
1567 struct zfcp_port *port;
1568 unsigned long flags;
1569
1570 zfcp_in_els_dbf_event(adapter, "##plogi", status_buffer, 28);
1571
1572 read_lock_irqsave(&zfcp_data.config_lock, flags);
1573 list_for_each_entry(port, &adapter->port_list_head, list) {
1574 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1575 break;
1576 }
1577 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1578
1579 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1580 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1581 "with d_id 0x%08x on adapter %s\n",
1582 status_buffer->d_id,
1583 zfcp_get_busid_by_adapter(adapter));
1584 } else {
1585 debug_text_event(adapter->erp_dbf, 1, "unsol_els_plogi:");
1586 debug_event(adapter->erp_dbf, 1, &els_logi->nport_wwn, 8);
1587 zfcp_erp_port_forced_reopen(port, 0);
1588 }
1589}
1590
1591static void
1592zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1593 struct fsf_status_read_buffer *status_buffer)
1594{
1595 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1596 struct zfcp_port *port;
1597 unsigned long flags;
1598
1599 zfcp_in_els_dbf_event(adapter, "##logo", status_buffer, 16);
1600
1601 read_lock_irqsave(&zfcp_data.config_lock, flags);
1602 list_for_each_entry(port, &adapter->port_list_head, list) {
1603 if (port->wwpn == els_logo->nport_wwpn)
1604 break;
1605 }
1606 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1607
1608 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1609 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1610 "with d_id 0x%08x on adapter %s\n",
1611 status_buffer->d_id,
1612 zfcp_get_busid_by_adapter(adapter));
1613 } else {
1614 debug_text_event(adapter->erp_dbf, 1, "unsol_els_logo:");
1615 debug_event(adapter->erp_dbf, 1, &els_logo->nport_wwpn, 8);
1616 zfcp_erp_port_forced_reopen(port, 0);
1617 }
1618}
1619
1620static void
1621zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1622 struct fsf_status_read_buffer *status_buffer)
1623{
1624 zfcp_in_els_dbf_event(adapter, "##undef", status_buffer, 24);
1625 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1626 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1627 zfcp_get_busid_by_adapter(adapter));
1628
1629}
1630
1631void
1632zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1633{
1634 struct fsf_status_read_buffer *status_buffer;
1635 u32 els_type;
1636 struct zfcp_adapter *adapter;
1637
1638 status_buffer = fsf_req->data.status_read.buffer;
1639 els_type = *(u32 *) (status_buffer->payload);
1640 adapter = fsf_req->adapter;
1641
1642 if (els_type == LS_PLOGI)
1643 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1644 else if (els_type == LS_LOGO)
1645 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1646 else if ((els_type & 0xffff0000) == LS_RSCN)
1647 /* we are only concerned with the command, not the length */
1648 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1649 else
1650 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1651}
1652
1653
1654/**
1655 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1656 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1657 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1658 */
1659static int
1660zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1661{
1662 struct zfcp_gid_pn_data *data;
1663
1664 if (pool != NULL) {
1665 data = mempool_alloc(pool, GFP_ATOMIC);
1666 if (likely(data != NULL)) {
1667 data->ct.pool = pool;
1668 }
1669 } else {
1670 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1671 }
1672
1673 if (NULL == data)
1674 return -ENOMEM;
1675
1676 memset(data, 0, sizeof(*data));
1677 data->ct.req = &data->req;
1678 data->ct.resp = &data->resp;
1679 data->ct.req_count = data->ct.resp_count = 1;
1680 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1681 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1682 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1683 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1684
1685 *gid_pn = data;
1686 return 0;
1687}
1688
1689/**
1690 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1691 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1692 */
1693static void
1694zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1695{
1696 if ((gid_pn->ct.pool != 0))
1697 mempool_free(gid_pn, gid_pn->ct.pool);
1698 else
1699 kfree(gid_pn);
1700
1701 return;
1702}
1703
1704/**
1705 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1706 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1707 */
1708int
1709zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1710{
1711 int ret;
1712 struct ct_iu_gid_pn_req *ct_iu_req;
1713 struct zfcp_gid_pn_data *gid_pn;
1714 struct zfcp_adapter *adapter = erp_action->adapter;
1715
1716 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1717 if (ret < 0) {
1718 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1719 "request failed for adapter %s\n",
1720 zfcp_get_busid_by_adapter(adapter));
1721 goto out;
1722 }
1723
1724 /* setup nameserver request */
1725 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1726 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1727 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1728 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1729 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1730 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1731 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1732 ct_iu_req->wwpn = erp_action->port->wwpn;
1733
1734 /* setup parameters for send generic command */
1735 gid_pn->ct.port = adapter->nameserver_port;
1736 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1737 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1738 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1739 gid_pn->ct.timer = &erp_action->timer;
1740 gid_pn->port = erp_action->port;
1741
1742 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1743 erp_action);
1744 if (ret) {
1745 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1746 "failed for adapter %s\n",
1747 zfcp_get_busid_by_adapter(adapter));
1748
1749 zfcp_gid_pn_buffers_free(gid_pn);
1750 }
1751
1752 out:
1753 return ret;
1754}
1755
1756/**
1757 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1758 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1759 */
1760static void zfcp_ns_gid_pn_handler(unsigned long data)
1761{
1762 struct zfcp_port *port;
1763 struct zfcp_send_ct *ct;
1764 struct ct_iu_gid_pn_req *ct_iu_req;
1765 struct ct_iu_gid_pn_resp *ct_iu_resp;
1766 struct zfcp_gid_pn_data *gid_pn;
1767
1768
1769 gid_pn = (struct zfcp_gid_pn_data *) data;
1770 port = gid_pn->port;
1771 ct = &gid_pn->ct;
1772 ct_iu_req = zfcp_sg_to_address(ct->req);
1773 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1774
1775 if ((ct->status != 0) || zfcp_check_ct_response(&ct_iu_resp->header)) {
1776 /* FIXME: do we need some specific erp entry points */
1777 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1778 goto failed;
1779 }
1780 /* paranoia */
1781 if (ct_iu_req->wwpn != port->wwpn) {
1782 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1783 "lookup does not match expected wwpn 0x%016Lx "
1784 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1785 zfcp_get_busid_by_port(port));
1786 goto mismatch;
1787 }
1788
1789 /* looks like a valid d_id */
1790 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1791 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1792 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1793 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1794 goto out;
1795
1796 mismatch:
1797 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1798 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1799 sizeof(struct ct_iu_gid_pn_req));
1800 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1801 sizeof(struct ct_iu_gid_pn_resp));
1802
1803 failed:
1804 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1805 "0x%016Lx for adapter %s\n",
1806 port->wwpn, zfcp_get_busid_by_port(port));
1807 out:
1808 zfcp_gid_pn_buffers_free(gid_pn);
1809 return;
1810}
1811
1812/* reject CT_IU reason codes acc. to FC-GS-4 */
1813static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1814 {0x01, "invalid command code"},
1815 {0x02, "invalid version level"},
1816 {0x03, "logical error"},
1817 {0x04, "invalid CT_IU size"},
1818 {0x05, "logical busy"},
1819 {0x07, "protocol error"},
1820 {0x09, "unable to perform command request"},
1821 {0x0b, "command not supported"},
1822 {0x0d, "server not available"},
1823 {0x0e, "session could not be established"},
1824 {0xff, "vendor specific error"},
1825 {0, NULL},
1826};
1827
1828/* LS_RJT reason codes acc. to FC-FS */
1829static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1830 {0x01, "invalid LS_Command code"},
1831 {0x03, "logical error"},
1832 {0x05, "logical busy"},
1833 {0x07, "protocol error"},
1834 {0x09, "unable to perform command request"},
1835 {0x0b, "command not supported"},
1836 {0x0e, "command already in progress"},
1837 {0xff, "vendor specific error"},
1838 {0, NULL},
1839};
1840
1841/* reject reason codes according to FC-PH/FC-FS */
1842static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1843 {0x01, "invalid D_ID"},
1844 {0x02, "invalid S_ID"},
1845 {0x03, "Nx_Port not available, temporary"},
1846 {0x04, "Nx_Port not available, permament"},
1847 {0x05, "class not supported"},
1848 {0x06, "delimiter usage error"},
1849 {0x07, "TYPE not supported"},
1850 {0x08, "invalid Link_Control"},
1851 {0x09, "invalid R_CTL field"},
1852 {0x0a, "invalid F_CTL field"},
1853 {0x0b, "invalid OX_ID"},
1854 {0x0c, "invalid RX_ID"},
1855 {0x0d, "invalid SEQ_ID"},
1856 {0x0e, "invalid DF_CTL"},
1857 {0x0f, "invalid SEQ_CNT"},
1858 {0x10, "invalid parameter field"},
1859 {0x11, "exchange error"},
1860 {0x12, "protocol error"},
1861 {0x13, "incorrect length"},
1862 {0x14, "unsupported ACK"},
1863 {0x15, "class of service not supported by entity at FFFFFE"},
1864 {0x16, "login required"},
1865 {0x17, "excessive sequences attempted"},
1866 {0x18, "unable to establish exchange"},
1867 {0x1a, "fabric path not available"},
1868 {0x1b, "invalid VC_ID (class 4)"},
1869 {0x1c, "invalid CS_CTL field"},
1870 {0x1d, "insufficient resources for VC (class 4)"},
1871 {0x1f, "invalid class of service"},
1872 {0x20, "preemption request rejected"},
1873 {0x21, "preemption not enabled"},
1874 {0x22, "multicast error"},
1875 {0x23, "multicast error terminate"},
1876 {0x24, "process login required"},
1877 {0xff, "vendor specific reject"},
1878 {0, NULL},
1879};
1880
1881/**
1882 * zfcp_rc_description - return description for given reaon code
1883 * @code: reason code
1884 * @rc_table: table of reason codes and descriptions
1885 */
1886static inline const char *
1887zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1888{
1889 const char *descr = "unknown reason code";
1890
1891 do {
1892 if (code == rc_table->code) {
1893 descr = rc_table->description;
1894 break;
1895 }
1896 rc_table++;
1897 } while (rc_table->code && rc_table->description);
1898
1899 return descr;
1900}
1901
1902/**
1903 * zfcp_check_ct_response - evaluate reason code for CT_IU
1904 * @rjt: response payload to an CT_IU request
1905 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1906 */
1907int
1908zfcp_check_ct_response(struct ct_hdr *rjt)
1909{
1910 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1911 return 0;
1912
1913 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1914 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1915 "response code (0x%04hx)\n",
1916 rjt->cmd_rsp_code);
1917 return 1;
1918 }
1919
1920 ZFCP_LOG_INFO("Generic Service command rejected\n");
1921 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1922 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1923 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1924 (u32) rjt->vendor_unique);
1925
1926 return 1;
1927}
1928
1929/**
1930 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1931 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1932 * @rc_table: table of reason codes and descriptions
1933 */
1934static inline void
1935zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1936 const struct zfcp_rc_entry *rc_table)
1937{
1938 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1939 zfcp_rc_description(rjt_par->reason_code, rc_table),
1940 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1941 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1942}
1943
1944/**
1945 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1946 * @sq: status qualifier word
1947 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1948 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1949 */
1950int
1951zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1952{
1953 int ret = -EIO;
1954
1955 if (sq == FSF_IOSTAT_NPORT_RJT) {
1956 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1957 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1958 /* invalid d_id */
1959 if (rjt_par->reason_code == 0x01)
1960 ret = -EREMCHG;
1961 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1962 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1963 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1964 /* invalid d_id */
1965 if (rjt_par->reason_code == 0x01)
1966 ret = -EREMCHG;
1967 } else if (sq == FSF_IOSTAT_LS_RJT) {
1968 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1969 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1970 ret = -EREMOTEIO;
1971 } else
1972 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1973
1974 return ret;
1975}
1976
1977#undef ZFCP_LOG_AREA
Linux kernel - Deliverables
This page took 0.096088 seconds and 5 git commands to generate.