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[PATCH] mempool: use common mempool kmalloc allocator
[linux-block.git] / drivers / s390 / scsi / zfcp_aux.c
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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
1da177e4
LT		 32#include "zfcp_ext.h"
33
34/* accumulated log level (module parameter) */
35static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
36static char *device;
37/*********************** FUNCTION PROTOTYPES *********************************/
38
39/* written against the module interface */
40static int __init zfcp_module_init(void);
41
42/* FCP related */
43static void zfcp_ns_gid_pn_handler(unsigned long);
44
45/* miscellaneous */
46static inline int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
47static inline void zfcp_sg_list_free(struct zfcp_sg_list *);
48static inline int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
49 void __user *, size_t);
50static inline int zfcp_sg_list_copy_to_user(void __user *,
51 struct zfcp_sg_list *, size_t);
52
bd6ae2f6 53static long zfcp_cfdc_dev_ioctl(struct file *, unsigned int, unsigned long);
1da177e4
LT		 54
55#define ZFCP_CFDC_IOC_MAGIC 0xDD
56#define ZFCP_CFDC_IOC \
57 _IOWR(ZFCP_CFDC_IOC_MAGIC, 0, struct zfcp_cfdc_sense_data)
58
1da177e4
LT		 59
60static struct file_operations zfcp_cfdc_fops = {
e183b06b 61 .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
62#ifdef CONFIG_COMPAT
63 .compat_ioctl = zfcp_cfdc_dev_ioctl
64#endif
1da177e4
LT		 65};
66
67static struct miscdevice zfcp_cfdc_misc = {
68 .minor = ZFCP_CFDC_DEV_MINOR,
69 .name = ZFCP_CFDC_DEV_NAME,
70 .fops = &zfcp_cfdc_fops
71};
72
73/*********************** KERNEL/MODULE PARAMETERS ***************************/
74
75/* declare driver module init/cleanup functions */
76module_init(zfcp_module_init);
77
78MODULE_AUTHOR("Heiko Carstens <heiko.carstens@de.ibm.com>, "
79 "Andreas Herrman <aherrman@de.ibm.com>, "
80 "Martin Peschke <mpeschke@de.ibm.com>, "
81 "Raimund Schroeder <raimund.schroeder@de.ibm.com>, "
82 "Wolfgang Taphorn <taphorn@de.ibm.com>, "
83 "Aron Zeh <arzeh@de.ibm.com>, "
84 "IBM Deutschland Entwicklung GmbH");
85MODULE_DESCRIPTION
86 ("FCP (SCSI over Fibre Channel) HBA driver for IBM eServer zSeries");
87MODULE_LICENSE("GPL");
88
6f71d9bc 89module_param(device, charp, 0400);
1da177e4
LT		 90MODULE_PARM_DESC(device, "specify initial device");
91
6f71d9bc 92module_param(loglevel, uint, 0400);
1da177e4
LT		 93MODULE_PARM_DESC(loglevel,
94 "log levels, 8 nibbles: "
95 "FC ERP QDIO CIO Config FSF SCSI Other, "
96 "levels: 0=none 1=normal 2=devel 3=trace");
97
1da177e4
LT		 98/****************************************************************/
99/************** Functions without logging ***********************/
100/****************************************************************/
101
102void
103_zfcp_hex_dump(char *addr, int count)
104{
105 int i;
106 for (i = 0; i < count; i++) {
107 printk("%02x", addr[i]);
108 if ((i % 4) == 3)
109 printk(" ");
110 if ((i % 32) == 31)
111 printk("\n");
112 }
113 if (((i-1) % 32) != 31)
114 printk("\n");
115}
116
117/****************************************************************/
118/************** Uncategorised Functions *************************/
119/****************************************************************/
120
121#define ZFCP_LOG_AREA ZFCP_LOG_AREA_OTHER
122
1da177e4
LT		 123/**
124 * zfcp_device_setup - setup function
125 * @str: pointer to parameter string
126 *
127 * Parse "device=..." parameter string.
128 */
129static int __init
cd8a383e 130zfcp_device_setup(char *devstr)
1da177e4 131{
cd8a383e
AH		 132 char *tmp, *str;
133 size_t len;
1da177e4 134
cd8a383e 135 if (!devstr)
1da177e4
LT		 136 return 0;
137
cd8a383e
AH		 138 len = strlen(devstr) + 1;
139 str = (char *) kmalloc(len, GFP_KERNEL);
140 if (!str)
141 goto err_out;
142 memcpy(str, devstr, len);
143
1da177e4
LT		 144 tmp = strchr(str, ',');
145 if (!tmp)
146 goto err_out;
147 *tmp++ = '\0';
148 strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
149 zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
150
151 zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
152 if (*tmp++ != ',')
153 goto err_out;
154 if (*tmp == '\0')
155 goto err_out;
156
157 zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
158 if (*tmp != '\0')
159 goto err_out;
cd8a383e 160 kfree(str);
1da177e4
LT		 161 return 1;
162
163 err_out:
164 ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
cd8a383e 165 kfree(str);
1da177e4
LT		 166 return 0;
167}
168
169static void __init
170zfcp_init_device_configure(void)
171{
172 struct zfcp_adapter *adapter;
173 struct zfcp_port *port;
174 struct zfcp_unit *unit;
175
176 down(&zfcp_data.config_sema);
177 read_lock_irq(&zfcp_data.config_lock);
178 adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
179 if (adapter)
180 zfcp_adapter_get(adapter);
181 read_unlock_irq(&zfcp_data.config_lock);
182
183 if (adapter == NULL)
184 goto out_adapter;
185 port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
186 if (!port)
187 goto out_port;
188 unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
189 if (!unit)
190 goto out_unit;
191 up(&zfcp_data.config_sema);
192 ccw_device_set_online(adapter->ccw_device);
193 zfcp_erp_wait(adapter);
194 down(&zfcp_data.config_sema);
195 zfcp_unit_put(unit);
196 out_unit:
197 zfcp_port_put(port);
198 out_port:
199 zfcp_adapter_put(adapter);
200 out_adapter:
201 up(&zfcp_data.config_sema);
202 return;
203}
204
205static int __init
206zfcp_module_init(void)
207{
208
209 int retval = 0;
210
211 atomic_set(&zfcp_data.loglevel, loglevel);
212
213 /* initialize adapter list */
214 INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
215
216 /* initialize adapters to be removed list head */
217 INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
218
219 zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
220 if (!zfcp_transport_template)
221 return -ENODEV;
222
1da177e4
LT		 223 retval = misc_register(&zfcp_cfdc_misc);
224 if (retval != 0) {
225 ZFCP_LOG_INFO("registration of misc device "
226 "zfcp_cfdc failed\n");
e183b06b 227 goto out;
1da177e4
LT		 228 }
229
e183b06b 230 ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
231 ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
232
1da177e4
LT		 233 /* Initialise proc semaphores */
234 sema_init(&zfcp_data.config_sema, 1);
235
236 /* initialise configuration rw lock */
237 rwlock_init(&zfcp_data.config_lock);
238
239 /* save address of data structure managing the driver module */
240 zfcp_data.scsi_host_template.module = THIS_MODULE;
241
242 /* setup dynamic I/O */
243 retval = zfcp_ccw_register();
244 if (retval) {
245 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
246 goto out_ccw_register;
247 }
248
249 if (zfcp_device_setup(device))
250 zfcp_init_device_configure();
251
252 goto out;
253
254 out_ccw_register:
255 misc_deregister(&zfcp_cfdc_misc);
1da177e4
LT		 256 out:
257 return retval;
258}
259
260/*
261 * function: zfcp_cfdc_dev_ioctl
262 *
263 * purpose: Handle control file upload/download transaction via IOCTL
264 * interface
265 *
266 * returns: 0 - Operation completed successfuly
267 * -ENOTTY - Unknown IOCTL command
268 * -EINVAL - Invalid sense data record
269 * -ENXIO - The FCP adapter is not available
270 * -EOPNOTSUPP - The FCP adapter does not have CFDC support
271 * -ENOMEM - Insufficient memory
272 * -EFAULT - User space memory I/O operation fault
273 * -EPERM - Cannot create or queue FSF request or create SBALs
274 * -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
275 */
e183b06b 276static long
277zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
278 unsigned long buffer)
1da177e4
LT		 279{
280 struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
281 struct zfcp_adapter *adapter = NULL;
282 struct zfcp_fsf_req *fsf_req = NULL;
283 struct zfcp_sg_list *sg_list = NULL;
284 u32 fsf_command, option;
285 char *bus_id = NULL;
286 int retval = 0;
287
288 sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
289 if (sense_data == NULL) {
290 retval = -ENOMEM;
291 goto out;
292 }
293
294 sg_list = kmalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
295 if (sg_list == NULL) {
296 retval = -ENOMEM;
297 goto out;
298 }
299 memset(sg_list, 0, sizeof(*sg_list));
300
301 if (command != ZFCP_CFDC_IOC) {
302 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
303 retval = -ENOTTY;
304 goto out;
305 }
306
307 if ((sense_data_user = (void __user *) buffer) == NULL) {
308 ZFCP_LOG_INFO("sense data record is required\n");
309 retval = -EINVAL;
310 goto out;
311 }
312
313 retval = copy_from_user(sense_data, sense_data_user,
314 sizeof(struct zfcp_cfdc_sense_data));
315 if (retval) {
316 retval = -EFAULT;
317 goto out;
318 }
319
320 if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
321 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
322 ZFCP_CFDC_SIGNATURE);
323 retval = -EINVAL;
324 goto out;
325 }
326
327 switch (sense_data->command) {
328
329 case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
330 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
331 option = FSF_CFDC_OPTION_NORMAL_MODE;
332 break;
333
334 case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
335 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
336 option = FSF_CFDC_OPTION_FORCE;
337 break;
338
339 case ZFCP_CFDC_CMND_FULL_ACCESS:
340 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
341 option = FSF_CFDC_OPTION_FULL_ACCESS;
342 break;
343
344 case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
345 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
346 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
347 break;
348
349 case ZFCP_CFDC_CMND_UPLOAD:
350 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
351 option = 0;
352 break;
353
354 default:
355 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
356 sense_data->command);
357 retval = -EINVAL;
358 goto out;
359 }
360
361 bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
362 if (bus_id == NULL) {
363 retval = -ENOMEM;
364 goto out;
365 }
366 snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
367 (sense_data->devno >> 24),
368 (sense_data->devno >> 16) & 0xFF,
369 (sense_data->devno & 0xFFFF));
370
371 read_lock_irq(&zfcp_data.config_lock);
372 adapter = zfcp_get_adapter_by_busid(bus_id);
373 if (adapter)
374 zfcp_adapter_get(adapter);
375 read_unlock_irq(&zfcp_data.config_lock);
376
377 kfree(bus_id);
378
379 if (adapter == NULL) {
380 ZFCP_LOG_INFO("invalid adapter\n");
381 retval = -ENXIO;
382 goto out;
383 }
384
385 if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
386 retval = zfcp_sg_list_alloc(sg_list,
387 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
388 if (retval) {
389 retval = -ENOMEM;
390 goto out;
391 }
392 }
393
394 if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
395 (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
396 retval = zfcp_sg_list_copy_from_user(
397 sg_list, &sense_data_user->control_file,
398 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
399 if (retval) {
400 retval = -EFAULT;
401 goto out;
402 }
403 }
404
405 retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
406 option, sg_list);
407 if (retval)
408 goto out;
409
410 if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
411 (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
412 retval = -ENXIO;
413 goto out;
414 }
415
416 sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
417 memcpy(&sense_data->fsf_status_qual,
418 &fsf_req->qtcb->header.fsf_status_qual,
419 sizeof(union fsf_status_qual));
420 memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
421
422 retval = copy_to_user(sense_data_user, sense_data,
423 sizeof(struct zfcp_cfdc_sense_data));
424 if (retval) {
425 retval = -EFAULT;
426 goto out;
427 }
428
429 if (sense_data->command & ZFCP_CFDC_UPLOAD) {
430 retval = zfcp_sg_list_copy_to_user(
431 &sense_data_user->control_file, sg_list,
432 ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
433 if (retval) {
434 retval = -EFAULT;
435 goto out;
436 }
437 }
438
439 out:
440 if (fsf_req != NULL)
1db2c9c0 441 zfcp_fsf_req_free(fsf_req);
1da177e4
LT		 442
443 if ((adapter != NULL) && (retval != -ENXIO))
444 zfcp_adapter_put(adapter);
445
446 if (sg_list != NULL) {
447 zfcp_sg_list_free(sg_list);
448 kfree(sg_list);
449 }
450
17fd682e 451 kfree(sense_data);
1da177e4
LT		 452
453 return retval;
454}
455
456
457/**
458 * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
459 * @sg_list: structure describing a scatter gather list
460 * @size: size of scatter-gather list
461 * Return: 0 on success, else -ENOMEM
462 *
463 * In sg_list->sg a pointer to the created scatter-gather list is returned,
464 * or NULL if we run out of memory. sg_list->count specifies the number of
465 * elements of the scatter-gather list. The maximum size of a single element
466 * in the scatter-gather list is PAGE_SIZE.
467 */
468static inline int
469zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
470{
471 struct scatterlist *sg;
472 unsigned int i;
473 int retval = 0;
474 void *address;
475
476 BUG_ON(sg_list == NULL);
477
478 sg_list->count = size >> PAGE_SHIFT;
479 if (size & ~PAGE_MASK)
480 sg_list->count++;
481 sg_list->sg = kmalloc(sg_list->count * sizeof(struct scatterlist),
482 GFP_KERNEL);
483 if (sg_list->sg == NULL) {
484 sg_list->count = 0;
485 retval = -ENOMEM;
486 goto out;
487 }
488 memset(sg_list->sg, 0, sg_list->count * sizeof(struct scatterlist));
489
490 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
491 sg->length = min(size, PAGE_SIZE);
492 sg->offset = 0;
493 address = (void *) get_zeroed_page(GFP_KERNEL);
494 if (address == NULL) {
495 sg_list->count = i;
496 zfcp_sg_list_free(sg_list);
497 retval = -ENOMEM;
498 goto out;
499 }
500 zfcp_address_to_sg(address, sg);
501 size -= sg->length;
502 }
503
504 out:
505 return retval;
506}
507
508
509/**
510 * zfcp_sg_list_free - free memory of a scatter-gather list
511 * @sg_list: structure describing a scatter-gather list
512 *
513 * Memory for each element in the scatter-gather list is freed.
514 * Finally sg_list->sg is freed itself and sg_list->count is reset.
515 */
516static inline void
517zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
518{
519 struct scatterlist *sg;
520 unsigned int i;
521
522 BUG_ON(sg_list == NULL);
523
524 for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
525 free_page((unsigned long) zfcp_sg_to_address(sg));
526
527 sg_list->count = 0;
528 kfree(sg_list->sg);
529}
530
531/**
532 * zfcp_sg_size - determine size of a scatter-gather list
533 * @sg: array of (struct scatterlist)
534 * @sg_count: elements in array
535 * Return: size of entire scatter-gather list
536 */
537size_t
538zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
539{
540 unsigned int i;
541 struct scatterlist *p;
542 size_t size;
543
544 size = 0;
545 for (i = 0, p = sg; i < sg_count; i++, p++) {
546 BUG_ON(p == NULL);
547 size += p->length;
548 }
549
550 return size;
551}
552
553
554/**
555 * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
556 * @sg_list: structure describing a scatter-gather list
557 * @user_buffer: pointer to buffer in user space
558 * @size: number of bytes to be copied
559 * Return: 0 on success, -EFAULT if copy_from_user fails.
560 */
561static inline int
562zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
563 void __user *user_buffer,
564 size_t size)
565{
566 struct scatterlist *sg;
567 unsigned int length;
568 void *zfcp_buffer;
569 int retval = 0;
570
571 BUG_ON(sg_list == NULL);
572
573 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
574 return -EFAULT;
575
576 for (sg = sg_list->sg; size > 0; sg++) {
577 length = min((unsigned int)size, sg->length);
578 zfcp_buffer = zfcp_sg_to_address(sg);
579 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
580 retval = -EFAULT;
581 goto out;
582 }
583 user_buffer += length;
584 size -= length;
585 }
586
587 out:
588 return retval;
589}
590
591
592/**
593 * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
594 * @user_buffer: pointer to buffer in user space
595 * @sg_list: structure describing a scatter-gather list
596 * @size: number of bytes to be copied
597 * Return: 0 on success, -EFAULT if copy_to_user fails
598 */
599static inline int
600zfcp_sg_list_copy_to_user(void __user *user_buffer,
601 struct zfcp_sg_list *sg_list,
602 size_t size)
603{
604 struct scatterlist *sg;
605 unsigned int length;
606 void *zfcp_buffer;
607 int retval = 0;
608
609 BUG_ON(sg_list == NULL);
610
611 if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
612 return -EFAULT;
613
614 for (sg = sg_list->sg; size > 0; sg++) {
615 length = min((unsigned int) size, sg->length);
616 zfcp_buffer = zfcp_sg_to_address(sg);
617 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
618 retval = -EFAULT;
619 goto out;
620 }
621 user_buffer += length;
622 size -= length;
623 }
624
625 out:
626 return retval;
627}
628
629
630#undef ZFCP_LOG_AREA
631
632/****************************************************************/
633/****** Functions for configuration/set-up of structures ********/
634/****************************************************************/
635
636#define ZFCP_LOG_AREA ZFCP_LOG_AREA_CONFIG
637
638/**
639 * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
640 * @port: pointer to port to search for unit
641 * @fcp_lun: FCP LUN to search for
642 * Traverse list of all units of a port and return pointer to a unit
643 * with the given FCP LUN.
644 */
645struct zfcp_unit *
646zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
647{
648 struct zfcp_unit *unit;
649 int found = 0;
650
651 list_for_each_entry(unit, &port->unit_list_head, list) {
652 if ((unit->fcp_lun == fcp_lun) &&
653 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
654 {
655 found = 1;
656 break;
657 }
658 }
659 return found ? unit : NULL;
660}
661
662/**
663 * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
664 * @adapter: pointer to adapter to search for port
665 * @wwpn: wwpn to search for
666 * Traverse list of all ports of an adapter and return pointer to a port
667 * with the given wwpn.
668 */
669struct zfcp_port *
670zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
671{
672 struct zfcp_port *port;
673 int found = 0;
674
675 list_for_each_entry(port, &adapter->port_list_head, list) {
676 if ((port->wwpn == wwpn) &&
677 !(atomic_read(&port->status) &
678 (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
679 found = 1;
680 break;
681 }
682 }
683 return found ? port : NULL;
684}
685
686/**
687 * zfcp_get_port_by_did - find port in port list of adapter by d_id
688 * @adapter: pointer to adapter to search for port
689 * @d_id: d_id to search for
690 * Traverse list of all ports of an adapter and return pointer to a port
691 * with the given d_id.
692 */
693struct zfcp_port *
694zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
695{
696 struct zfcp_port *port;
697 int found = 0;
698
699 list_for_each_entry(port, &adapter->port_list_head, list) {
700 if ((port->d_id == d_id) &&
701 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
702 {
703 found = 1;
704 break;
705 }
706 }
707 return found ? port : NULL;
708}
709
710/**
711 * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
712 * @bus_id: bus_id to search for
713 * Traverse list of all adapters and return pointer to an adapter
714 * with the given bus_id.
715 */
716struct zfcp_adapter *
717zfcp_get_adapter_by_busid(char *bus_id)
718{
719 struct zfcp_adapter *adapter;
720 int found = 0;
721
722 list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
723 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
724 BUS_ID_SIZE) == 0) &&
725 !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
726 &adapter->status)){
727 found = 1;
728 break;
729 }
730 }
731 return found ? adapter : NULL;
732}
733
734/**
735 * zfcp_unit_enqueue - enqueue unit to unit list of a port.
736 * @port: pointer to port where unit is added
737 * @fcp_lun: FCP LUN of unit to be enqueued
738 * Return: pointer to enqueued unit on success, NULL on error
739 * Locks: config_sema must be held to serialize changes to the unit list
740 *
741 * Sets up some unit internal structures and creates sysfs entry.
742 */
743struct zfcp_unit *
744zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
745{
746 struct zfcp_unit *unit, *tmp_unit;
747 scsi_lun_t scsi_lun;
748 int found;
749
750 /*
751 * check that there is no unit with this FCP_LUN already in list
752 * and enqueue it.
753 * Note: Unlike for the adapter and the port, this is an error
754 */
755 read_lock_irq(&zfcp_data.config_lock);
756 unit = zfcp_get_unit_by_lun(port, fcp_lun);
757 read_unlock_irq(&zfcp_data.config_lock);
758 if (unit)
759 return NULL;
760
761 unit = kmalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
762 if (!unit)
763 return NULL;
764 memset(unit, 0, sizeof (struct zfcp_unit));
765
766 /* initialise reference count stuff */
767 atomic_set(&unit->refcount, 0);
768 init_waitqueue_head(&unit->remove_wq);
769
770 unit->port = port;
771 unit->fcp_lun = fcp_lun;
772
773 /* setup for sysfs registration */
774 snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
775 unit->sysfs_device.parent = &port->sysfs_device;
776 unit->sysfs_device.release = zfcp_sysfs_unit_release;
777 dev_set_drvdata(&unit->sysfs_device, unit);
778
779 /* mark unit unusable as long as sysfs registration is not complete */
780 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
781
782 if (device_register(&unit->sysfs_device)) {
783 kfree(unit);
784 return NULL;
785 }
786
787 if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
788 device_unregister(&unit->sysfs_device);
789 return NULL;
790 }
791
792 zfcp_unit_get(unit);
793
794 scsi_lun = 0;
795 found = 0;
796 write_lock_irq(&zfcp_data.config_lock);
797 list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
798 if (tmp_unit->scsi_lun != scsi_lun) {
799 found = 1;
800 break;
801 }
802 scsi_lun++;
803 }
804 unit->scsi_lun = scsi_lun;
805 if (found)
806 list_add_tail(&unit->list, &tmp_unit->list);
807 else
808 list_add_tail(&unit->list, &port->unit_list_head);
809 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
810 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
811 write_unlock_irq(&zfcp_data.config_lock);
812
813 port->units++;
814 zfcp_port_get(port);
815
816 return unit;
817}
818
819void
820zfcp_unit_dequeue(struct zfcp_unit *unit)
821{
822 zfcp_unit_wait(unit);
823 write_lock_irq(&zfcp_data.config_lock);
824 list_del(&unit->list);
825 write_unlock_irq(&zfcp_data.config_lock);
826 unit->port->units--;
827 zfcp_port_put(unit->port);
828 zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
829 device_unregister(&unit->sysfs_device);
830}
831
1da177e4
LT		 832/*
833 * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
834 * commands.
835 * It also genrates fcp-nameserver request/response buffer and unsolicited
836 * status read fsf_req buffers.
837 *
838 * locks: must only be called with zfcp_data.config_sema taken
839 */
840static int
841zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
842{
843 adapter->pool.fsf_req_erp =
0eaae62a
MD		 844 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
845 sizeof(struct zfcp_fsf_req_pool_element));
846 if (!adapter->pool.fsf_req_erp)
1da177e4
LT		 847 return -ENOMEM;
848
849 adapter->pool.fsf_req_scsi =
0eaae62a
MD		 850 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
851 sizeof(struct zfcp_fsf_req_pool_element));
852 if (!adapter->pool.fsf_req_scsi)
1da177e4
LT		 853 return -ENOMEM;
854
855 adapter->pool.fsf_req_abort =
0eaae62a
MD		 856 mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
857 sizeof(struct zfcp_fsf_req_pool_element));
858 if (!adapter->pool.fsf_req_abort)
1da177e4
LT		 859 return -ENOMEM;
860
861 adapter->pool.fsf_req_status_read =
0eaae62a
MD		 862 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
863 sizeof(struct zfcp_fsf_req));
864 if (!adapter->pool.fsf_req_status_read)
1da177e4
LT		 865 return -ENOMEM;
866
867 adapter->pool.data_status_read =
0eaae62a
MD		 868 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
869 sizeof(struct fsf_status_read_buffer));
870 if (!adapter->pool.data_status_read)
1da177e4
LT		 871 return -ENOMEM;
872
873 adapter->pool.data_gid_pn =
0eaae62a
MD		 874 mempool_create_kmalloc_pool(ZFCP_POOL_DATA_GID_PN_NR,
875 sizeof(struct zfcp_gid_pn_data));
876 if (!adapter->pool.data_gid_pn)
1da177e4
LT		 877 return -ENOMEM;
878
879 return 0;
880}
881
882/**
883 * zfcp_free_low_mem_buffers - free memory pools of an adapter
884 * @adapter: pointer to zfcp_adapter for which memory pools should be freed
885 * locking: zfcp_data.config_sema must be held
886 */
887static void
888zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
889{
890 if (adapter->pool.fsf_req_erp)
891 mempool_destroy(adapter->pool.fsf_req_erp);
892 if (adapter->pool.fsf_req_scsi)
893 mempool_destroy(adapter->pool.fsf_req_scsi);
894 if (adapter->pool.fsf_req_abort)
895 mempool_destroy(adapter->pool.fsf_req_abort);
896 if (adapter->pool.fsf_req_status_read)
897 mempool_destroy(adapter->pool.fsf_req_status_read);
898 if (adapter->pool.data_status_read)
899 mempool_destroy(adapter->pool.data_status_read);
900 if (adapter->pool.data_gid_pn)
901 mempool_destroy(adapter->pool.data_gid_pn);
902}
903
1da177e4
LT		 904void
905zfcp_dummy_release(struct device *dev)
906{
907 return;
908}
909
910/*
911 * Enqueues an adapter at the end of the adapter list in the driver data.
912 * All adapter internal structures are set up.
913 * Proc-fs entries are also created.
914 *
915 * returns: 0 if a new adapter was successfully enqueued
916 * ZFCP_KNOWN if an adapter with this devno was already present
917 * -ENOMEM if alloc failed
918 * locks: config_sema must be held to serialise changes to the adapter list
919 */
920struct zfcp_adapter *
921zfcp_adapter_enqueue(struct ccw_device *ccw_device)
922{
923 int retval = 0;
924 struct zfcp_adapter *adapter;
925
926 /*
927 * Note: It is safe to release the list_lock, as any list changes
928 * are protected by the config_sema, which must be held to get here
929 */
930
931 /* try to allocate new adapter data structure (zeroed) */
932 adapter = kmalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
933 if (!adapter) {
934 ZFCP_LOG_INFO("error: allocation of base adapter "
935 "structure failed\n");
936 goto out;
937 }
938 memset(adapter, 0, sizeof (struct zfcp_adapter));
939
940 ccw_device->handler = NULL;
941
942 /* save ccw_device pointer */
943 adapter->ccw_device = ccw_device;
944
945 retval = zfcp_qdio_allocate_queues(adapter);
946 if (retval)
947 goto queues_alloc_failed;
948
949 retval = zfcp_qdio_allocate(adapter);
950 if (retval)
951 goto qdio_allocate_failed;
952
953 retval = zfcp_allocate_low_mem_buffers(adapter);
954 if (retval) {
955 ZFCP_LOG_INFO("error: pool allocation failed\n");
956 goto failed_low_mem_buffers;
957 }
958
959 /* initialise reference count stuff */
960 atomic_set(&adapter->refcount, 0);
961 init_waitqueue_head(&adapter->remove_wq);
962
963 /* initialise list of ports */
964 INIT_LIST_HEAD(&adapter->port_list_head);
965
966 /* initialise list of ports to be removed */
967 INIT_LIST_HEAD(&adapter->port_remove_lh);
968
969 /* initialize list of fsf requests */
1db2c9c0 970 spin_lock_init(&adapter->fsf_req_list_lock);
1da177e4
LT		 971 INIT_LIST_HEAD(&adapter->fsf_req_list_head);
972
c48a29d0
HC		 973 /* initialize debug locks */
974
975 spin_lock_init(&adapter->erp_dbf_lock);
976 spin_lock_init(&adapter->hba_dbf_lock);
977 spin_lock_init(&adapter->san_dbf_lock);
978 spin_lock_init(&adapter->scsi_dbf_lock);
979
980 /* initialize error recovery stuff */
981
982 rwlock_init(&adapter->erp_lock);
983 sema_init(&adapter->erp_ready_sem, 0);
984 INIT_LIST_HEAD(&adapter->erp_ready_head);
985 INIT_LIST_HEAD(&adapter->erp_running_head);
986
1da177e4
LT		 987 /* initialize abort lock */
988 rwlock_init(&adapter->abort_lock);
989
990 /* initialise some erp stuff */
991 init_waitqueue_head(&adapter->erp_thread_wqh);
992 init_waitqueue_head(&adapter->erp_done_wqh);
993
994 /* initialize lock of associated request queue */
995 rwlock_init(&adapter->request_queue.queue_lock);
996
997 /* intitialise SCSI ER timer */
998 init_timer(&adapter->scsi_er_timer);
999
1000 /* set FC service class used per default */
1001 adapter->fc_service_class = ZFCP_FC_SERVICE_CLASS_DEFAULT;
1002
1003 sprintf(adapter->name, "%s", zfcp_get_busid_by_adapter(adapter));
1004 ASCEBC(adapter->name, strlen(adapter->name));
1005
1006 /* mark adapter unusable as long as sysfs registration is not complete */
1007 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1008
1009 adapter->ccw_device = ccw_device;
1010 dev_set_drvdata(&ccw_device->dev, adapter);
1011
1012 if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1013 goto sysfs_failed;
1014
1015 adapter->generic_services.parent = &adapter->ccw_device->dev;
1016 adapter->generic_services.release = zfcp_dummy_release;
1017 snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1018 "generic_services");
1019
1020 if (device_register(&adapter->generic_services))
1021 goto generic_services_failed;
1022
1023 /* put allocated adapter at list tail */
1024 write_lock_irq(&zfcp_data.config_lock);
1025 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1026 list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1027 write_unlock_irq(&zfcp_data.config_lock);
1028
1029 zfcp_data.adapters++;
1030
1031 goto out;
1032
1033 generic_services_failed:
1034 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1035 sysfs_failed:
1036 dev_set_drvdata(&ccw_device->dev, NULL);
1037 failed_low_mem_buffers:
1038 zfcp_free_low_mem_buffers(adapter);
1039 if (qdio_free(ccw_device) != 0)
1040 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1041 zfcp_get_busid_by_adapter(adapter));
1042 qdio_allocate_failed:
1043 zfcp_qdio_free_queues(adapter);
1044 queues_alloc_failed:
1045 kfree(adapter);
1046 adapter = NULL;
1047 out:
1048 return adapter;
1049}
1050
1051/*
1052 * returns: 0 - struct zfcp_adapter data structure successfully removed
1053 * !0 - struct zfcp_adapter data structure could not be removed
1054 * (e.g. still used)
1055 * locks: adapter list write lock is assumed to be held by caller
1056 * adapter->fsf_req_list_lock is taken and released within this
1057 * function and must not be held on entry
1058 */
1059void
1060zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1061{
1062 int retval = 0;
1063 unsigned long flags;
1064
1065 device_unregister(&adapter->generic_services);
1066 zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1067 dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1068 /* sanity check: no pending FSF requests */
1db2c9c0 1069 spin_lock_irqsave(&adapter->fsf_req_list_lock, flags);
1da177e4 1070 retval = !list_empty(&adapter->fsf_req_list_head);
1db2c9c0 1071 spin_unlock_irqrestore(&adapter->fsf_req_list_lock, flags);
1da177e4
LT		 1072 if (retval) {
1073 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1074 "%i requests outstanding\n",
1075 zfcp_get_busid_by_adapter(adapter), adapter,
1076 atomic_read(&adapter->fsf_reqs_active));
1077 retval = -EBUSY;
1078 goto out;
1079 }
1080
1081 /* remove specified adapter data structure from list */
1082 write_lock_irq(&zfcp_data.config_lock);
1083 list_del(&adapter->list);
1084 write_unlock_irq(&zfcp_data.config_lock);
1085
1086 /* decrease number of adapters in list */
1087 zfcp_data.adapters--;
1088
1089 ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1090 "%i adapters still in list\n",
1091 zfcp_get_busid_by_adapter(adapter),
1092 adapter, zfcp_data.adapters);
1093
1094 retval = qdio_free(adapter->ccw_device);
1095 if (retval)
1096 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1097 zfcp_get_busid_by_adapter(adapter));
1098
1099 zfcp_free_low_mem_buffers(adapter);
1100 /* free memory of adapter data structure and queues */
1101 zfcp_qdio_free_queues(adapter);
f6cd94b1
AH		 1102 kfree(adapter->fc_stats);
1103 kfree(adapter->stats_reset_data);
1da177e4
LT		 1104 ZFCP_LOG_TRACE("freeing adapter structure\n");
1105 kfree(adapter);
1106 out:
1107 return;
1108}
1109
1110/**
1111 * zfcp_port_enqueue - enqueue port to port list of adapter
1112 * @adapter: adapter where remote port is added
1113 * @wwpn: WWPN of the remote port to be enqueued
1114 * @status: initial status for the port
1115 * @d_id: destination id of the remote port to be enqueued
1116 * Return: pointer to enqueued port on success, NULL on error
1117 * Locks: config_sema must be held to serialize changes to the port list
1118 *
1119 * All port internal structures are set up and the sysfs entry is generated.
1120 * d_id is used to enqueue ports with a well known address like the Directory
1121 * Service for nameserver lookup.
1122 */
1123struct zfcp_port *
1124zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1125 u32 d_id)
1126{
3859f6a2 1127 struct zfcp_port *port;
1da177e4 1128 int check_wwpn;
1da177e4
LT		 1129
1130 check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1da177e4
LT		 1131 /*
1132 * check that there is no port with this WWPN already in list
1133 */
1134 if (check_wwpn) {
1135 read_lock_irq(&zfcp_data.config_lock);
1136 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1137 read_unlock_irq(&zfcp_data.config_lock);
1138 if (port)
1139 return NULL;
1140 }
1141
1142 port = kmalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1143 if (!port)
1144 return NULL;
1145 memset(port, 0, sizeof (struct zfcp_port));
1146
1147 /* initialise reference count stuff */
1148 atomic_set(&port->refcount, 0);
1149 init_waitqueue_head(&port->remove_wq);
1150
1151 INIT_LIST_HEAD(&port->unit_list_head);
1152 INIT_LIST_HEAD(&port->unit_remove_lh);
1153
1154 port->adapter = adapter;
1155
1156 if (check_wwpn)
1157 port->wwpn = wwpn;
1158
1159 atomic_set_mask(status, &port->status);
1160
1161 /* setup for sysfs registration */
1162 if (status & ZFCP_STATUS_PORT_WKA) {
1163 switch (d_id) {
1164 case ZFCP_DID_DIRECTORY_SERVICE:
1165 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1166 "directory");
1167 break;
1168 case ZFCP_DID_MANAGEMENT_SERVICE:
1169 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1170 "management");
1171 break;
1172 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1173 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1174 "key_distribution");
1175 break;
1176 case ZFCP_DID_ALIAS_SERVICE:
1177 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1178 "alias");
1179 break;
1180 case ZFCP_DID_TIME_SERVICE:
1181 snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1182 "time");
1183 break;
1184 default:
1185 kfree(port);
1186 return NULL;
1187 }
1188 port->d_id = d_id;
1189 port->sysfs_device.parent = &adapter->generic_services;
1190 } else {
1191 snprintf(port->sysfs_device.bus_id,
1192 BUS_ID_SIZE, "0x%016llx", wwpn);
3859f6a2 1193 port->sysfs_device.parent = &adapter->ccw_device->dev;
1da177e4
LT		 1194 }
1195 port->sysfs_device.release = zfcp_sysfs_port_release;
1196 dev_set_drvdata(&port->sysfs_device, port);
1197
1198 /* mark port unusable as long as sysfs registration is not complete */
1199 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1200
1201 if (device_register(&port->sysfs_device)) {
1202 kfree(port);
1203 return NULL;
1204 }
1205
1206 if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1207 device_unregister(&port->sysfs_device);
1208 return NULL;
1209 }
1210
1211 zfcp_port_get(port);
1212
1da177e4 1213 write_lock_irq(&zfcp_data.config_lock);
3859f6a2 1214 list_add_tail(&port->list, &adapter->port_list_head);
1da177e4
LT		 1215 atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1216 atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1217 if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1218 if (!adapter->nameserver_port)
1219 adapter->nameserver_port = port;
1220 adapter->ports++;
1221 write_unlock_irq(&zfcp_data.config_lock);
1222
1223 zfcp_adapter_get(adapter);
1224
1225 return port;
1226}
1227
1228void
1229zfcp_port_dequeue(struct zfcp_port *port)
1230{
1231 zfcp_port_wait(port);
1232 write_lock_irq(&zfcp_data.config_lock);
1233 list_del(&port->list);
1234 port->adapter->ports--;
1235 write_unlock_irq(&zfcp_data.config_lock);
3859f6a2 1236 if (port->rport)
20b1730a
HC		 1237 fc_remote_port_delete(port->rport);
1238 port->rport = NULL;
1da177e4
LT		 1239 zfcp_adapter_put(port->adapter);
1240 zfcp_sysfs_port_remove_files(&port->sysfs_device,
1241 atomic_read(&port->status));
1242 device_unregister(&port->sysfs_device);
1243}
1244
1245/* Enqueues a nameserver port */
1246int
1247zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1248{
1249 struct zfcp_port *port;
1250
1251 port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1252 ZFCP_DID_DIRECTORY_SERVICE);
1253 if (!port) {
1254 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1255 "adapter %s failed\n",
1256 zfcp_get_busid_by_adapter(adapter));
1257 return -ENXIO;
1258 }
1259 zfcp_port_put(port);
1260
1261 return 0;
1262}
1263
1264#undef ZFCP_LOG_AREA
1265
1266/****************************************************************/
1267/******* Fibre Channel Standard related Functions **************/
1268/****************************************************************/
1269
1270#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FC
1271
1272void
1273zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1274 struct fsf_status_read_buffer *status_buffer)
1275{
1276 struct fcp_rscn_head *fcp_rscn_head;
1277 struct fcp_rscn_element *fcp_rscn_element;
1278 struct zfcp_port *port;
1279 u16 i;
1280 u16 no_entries;
1281 u32 range_mask;
1282 unsigned long flags;
1283
1284 fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1285 fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1286
1287 /* see FC-FS */
1288 no_entries = (fcp_rscn_head->payload_len / 4);
1289
1da177e4
LT		 1290 for (i = 1; i < no_entries; i++) {
1291 /* skip head and start with 1st element */
1292 fcp_rscn_element++;
1293 switch (fcp_rscn_element->addr_format) {
1294 case ZFCP_PORT_ADDRESS:
1da177e4
LT		 1295 range_mask = ZFCP_PORTS_RANGE_PORT;
1296 break;
1297 case ZFCP_AREA_ADDRESS:
1da177e4
LT		 1298 range_mask = ZFCP_PORTS_RANGE_AREA;
1299 break;
1300 case ZFCP_DOMAIN_ADDRESS:
1da177e4
LT		 1301 range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1302 break;
1303 case ZFCP_FABRIC_ADDRESS:
1da177e4
LT		 1304 range_mask = ZFCP_PORTS_RANGE_FABRIC;
1305 break;
1306 default:
1307 ZFCP_LOG_INFO("incoming RSCN with unknown "
1308 "address format\n");
1309 continue;
1310 }
1311 read_lock_irqsave(&zfcp_data.config_lock, flags);
1312 list_for_each_entry(port, &adapter->port_list_head, list) {
1313 if (atomic_test_mask
1314 (ZFCP_STATUS_PORT_WKA, &port->status))
1315 continue;
1316 /* Do we know this port? If not skip it. */
1317 if (!atomic_test_mask
1318 (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1319 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1320 "port 0x%016Lx\n", port->wwpn);
1da177e4
LT		 1321 zfcp_erp_port_reopen(port,
1322 ZFCP_STATUS_COMMON_ERP_FAILED);
1323 continue;
1324 }
1325
1326 /*
1327 * FIXME: race: d_id might being invalidated
1328 * (...DID_DID reset)
1329 */
1330 if ((port->d_id & range_mask)
1331 == (fcp_rscn_element->nport_did & range_mask)) {
1332 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1333 fcp_rscn_element->nport_did);
1334 /*
1335 * Unfortunately, an RSCN does not specify the
1336 * type of change a target underwent. We assume
1337 * that it makes sense to reopen the link.
1338 * FIXME: Shall we try to find out more about
1339 * the target and link state before closing it?
1340 * How to accomplish this? (nameserver?)
1341 * Where would such code be put in?
1342 * (inside or outside erp)
1343 */
1344 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1345 "port 0x%016Lx\n", port->wwpn);
1da177e4
LT		 1346 zfcp_test_link(port);
1347 }
1348 }
1349 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1350 }
1351}
1352
1353static void
1354zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1355 struct fsf_status_read_buffer *status_buffer)
1356{
1357 logi *els_logi = (logi *) status_buffer->payload;
1358 struct zfcp_port *port;
1359 unsigned long flags;
1360
1da177e4
LT		 1361 read_lock_irqsave(&zfcp_data.config_lock, flags);
1362 list_for_each_entry(port, &adapter->port_list_head, list) {
1363 if (port->wwpn == (*(wwn_t *) & els_logi->nport_wwn))
1364 break;
1365 }
1366 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1367
1368 if (!port || (port->wwpn != (*(wwn_t *) & els_logi->nport_wwn))) {
1369 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1370 "with d_id 0x%08x on adapter %s\n",
1371 status_buffer->d_id,
1372 zfcp_get_busid_by_adapter(adapter));
1373 } else {
1da177e4
LT		 1374 zfcp_erp_port_forced_reopen(port, 0);
1375 }
1376}
1377
1378static void
1379zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1380 struct fsf_status_read_buffer *status_buffer)
1381{
1382 struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1383 struct zfcp_port *port;
1384 unsigned long flags;
1385
1da177e4
LT		 1386 read_lock_irqsave(&zfcp_data.config_lock, flags);
1387 list_for_each_entry(port, &adapter->port_list_head, list) {
1388 if (port->wwpn == els_logo->nport_wwpn)
1389 break;
1390 }
1391 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1392
1393 if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1394 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1395 "with d_id 0x%08x on adapter %s\n",
1396 status_buffer->d_id,
1397 zfcp_get_busid_by_adapter(adapter));
1398 } else {
1da177e4
LT		 1399 zfcp_erp_port_forced_reopen(port, 0);
1400 }
1401}
1402
1403static void
1404zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1405 struct fsf_status_read_buffer *status_buffer)
1406{
1da177e4
LT		 1407 ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1408 "for adapter %s\n", *(u32 *) (status_buffer->payload),
1409 zfcp_get_busid_by_adapter(adapter));
1410
1411}
1412
1413void
1414zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1415{
1416 struct fsf_status_read_buffer *status_buffer;
1417 u32 els_type;
1418 struct zfcp_adapter *adapter;
1419
059c97d0 1420 status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1da177e4
LT		 1421 els_type = *(u32 *) (status_buffer->payload);
1422 adapter = fsf_req->adapter;
1423
8a36e453 1424 zfcp_san_dbf_event_incoming_els(fsf_req);
1da177e4
LT		 1425 if (els_type == LS_PLOGI)
1426 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1427 else if (els_type == LS_LOGO)
1428 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1429 else if ((els_type & 0xffff0000) == LS_RSCN)
1430 /* we are only concerned with the command, not the length */
1431 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1432 else
1433 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1434}
1435
1436
1437/**
1438 * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1439 * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1440 * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1441 */
1442static int
1443zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1444{
1445 struct zfcp_gid_pn_data *data;
1446
1447 if (pool != NULL) {
1448 data = mempool_alloc(pool, GFP_ATOMIC);
1449 if (likely(data != NULL)) {
1450 data->ct.pool = pool;
1451 }
1452 } else {
1453 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1454 }
1455
1456 if (NULL == data)
1457 return -ENOMEM;
1458
1459 memset(data, 0, sizeof(*data));
1460 data->ct.req = &data->req;
1461 data->ct.resp = &data->resp;
1462 data->ct.req_count = data->ct.resp_count = 1;
1463 zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1464 zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1465 data->req.length = sizeof(struct ct_iu_gid_pn_req);
1466 data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1467
1468 *gid_pn = data;
1469 return 0;
1470}
1471
1472/**
1473 * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1474 * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1475 */
1476static void
1477zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1478{
1479 if ((gid_pn->ct.pool != 0))
1480 mempool_free(gid_pn, gid_pn->ct.pool);
1481 else
1482 kfree(gid_pn);
1483
1484 return;
1485}
1486
1487/**
1488 * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1489 * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1490 */
1491int
1492zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1493{
1494 int ret;
1495 struct ct_iu_gid_pn_req *ct_iu_req;
1496 struct zfcp_gid_pn_data *gid_pn;
1497 struct zfcp_adapter *adapter = erp_action->adapter;
1498
1499 ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1500 if (ret < 0) {
1501 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1502 "request failed for adapter %s\n",
1503 zfcp_get_busid_by_adapter(adapter));
1504 goto out;
1505 }
1506
1507 /* setup nameserver request */
1508 ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1509 ct_iu_req->header.revision = ZFCP_CT_REVISION;
1510 ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1511 ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1512 ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1513 ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1514 ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1515 ct_iu_req->wwpn = erp_action->port->wwpn;
1516
1517 /* setup parameters for send generic command */
1518 gid_pn->ct.port = adapter->nameserver_port;
1519 gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1520 gid_pn->ct.handler_data = (unsigned long) gid_pn;
1521 gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1522 gid_pn->ct.timer = &erp_action->timer;
1523 gid_pn->port = erp_action->port;
1524
1525 ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1526 erp_action);
1527 if (ret) {
1528 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1529 "failed for adapter %s\n",
1530 zfcp_get_busid_by_adapter(adapter));
1531
1532 zfcp_gid_pn_buffers_free(gid_pn);
1533 }
1534
1535 out:
1536 return ret;
1537}
1538
1539/**
1540 * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1541 * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1542 */
1543static void zfcp_ns_gid_pn_handler(unsigned long data)
1544{
1545 struct zfcp_port *port;
1546 struct zfcp_send_ct *ct;
1547 struct ct_iu_gid_pn_req *ct_iu_req;
1548 struct ct_iu_gid_pn_resp *ct_iu_resp;
1549 struct zfcp_gid_pn_data *gid_pn;
1550
1551
1552 gid_pn = (struct zfcp_gid_pn_data *) data;
1553 port = gid_pn->port;
1554 ct = &gid_pn->ct;
1555 ct_iu_req = zfcp_sg_to_address(ct->req);
1556 ct_iu_resp = zfcp_sg_to_address(ct->resp);
1557
66c8684a
AH		 1558 if (ct->status != 0)
1559 goto failed;
1560
1561 if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1da177e4
LT		 1562 /* FIXME: do we need some specific erp entry points */
1563 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1564 goto failed;
1565 }
1566 /* paranoia */
1567 if (ct_iu_req->wwpn != port->wwpn) {
1568 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1569 "lookup does not match expected wwpn 0x%016Lx "
1570 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1571 zfcp_get_busid_by_port(port));
1572 goto mismatch;
1573 }
1574
1575 /* looks like a valid d_id */
1576 port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1577 atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1578 ZFCP_LOG_DEBUG("adapter %s: wwpn=0x%016Lx ---> d_id=0x%08x\n",
1579 zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1580 goto out;
1581
1582 mismatch:
1583 ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1584 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1585 sizeof(struct ct_iu_gid_pn_req));
1586 ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1587 sizeof(struct ct_iu_gid_pn_resp));
1588
1589 failed:
1590 ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1591 "0x%016Lx for adapter %s\n",
1592 port->wwpn, zfcp_get_busid_by_port(port));
1593 out:
1594 zfcp_gid_pn_buffers_free(gid_pn);
1595 return;
1596}
1597
1598/* reject CT_IU reason codes acc. to FC-GS-4 */
1599static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1600 {0x01, "invalid command code"},
1601 {0x02, "invalid version level"},
1602 {0x03, "logical error"},
1603 {0x04, "invalid CT_IU size"},
1604 {0x05, "logical busy"},
1605 {0x07, "protocol error"},
1606 {0x09, "unable to perform command request"},
1607 {0x0b, "command not supported"},
1608 {0x0d, "server not available"},
1609 {0x0e, "session could not be established"},
1610 {0xff, "vendor specific error"},
1611 {0, NULL},
1612};
1613
1614/* LS_RJT reason codes acc. to FC-FS */
1615static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1616 {0x01, "invalid LS_Command code"},
1617 {0x03, "logical error"},
1618 {0x05, "logical busy"},
1619 {0x07, "protocol error"},
1620 {0x09, "unable to perform command request"},
1621 {0x0b, "command not supported"},
1622 {0x0e, "command already in progress"},
1623 {0xff, "vendor specific error"},
1624 {0, NULL},
1625};
1626
1627/* reject reason codes according to FC-PH/FC-FS */
1628static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1629 {0x01, "invalid D_ID"},
1630 {0x02, "invalid S_ID"},
1631 {0x03, "Nx_Port not available, temporary"},
1632 {0x04, "Nx_Port not available, permament"},
1633 {0x05, "class not supported"},
1634 {0x06, "delimiter usage error"},
1635 {0x07, "TYPE not supported"},
1636 {0x08, "invalid Link_Control"},
1637 {0x09, "invalid R_CTL field"},
1638 {0x0a, "invalid F_CTL field"},
1639 {0x0b, "invalid OX_ID"},
1640 {0x0c, "invalid RX_ID"},
1641 {0x0d, "invalid SEQ_ID"},
1642 {0x0e, "invalid DF_CTL"},
1643 {0x0f, "invalid SEQ_CNT"},
1644 {0x10, "invalid parameter field"},
1645 {0x11, "exchange error"},
1646 {0x12, "protocol error"},
1647 {0x13, "incorrect length"},
1648 {0x14, "unsupported ACK"},
1649 {0x15, "class of service not supported by entity at FFFFFE"},
1650 {0x16, "login required"},
1651 {0x17, "excessive sequences attempted"},
1652 {0x18, "unable to establish exchange"},
1653 {0x1a, "fabric path not available"},
1654 {0x1b, "invalid VC_ID (class 4)"},
1655 {0x1c, "invalid CS_CTL field"},
1656 {0x1d, "insufficient resources for VC (class 4)"},
1657 {0x1f, "invalid class of service"},
1658 {0x20, "preemption request rejected"},
1659 {0x21, "preemption not enabled"},
1660 {0x22, "multicast error"},
1661 {0x23, "multicast error terminate"},
1662 {0x24, "process login required"},
1663 {0xff, "vendor specific reject"},
1664 {0, NULL},
1665};
1666
1667/**
1668 * zfcp_rc_description - return description for given reaon code
1669 * @code: reason code
1670 * @rc_table: table of reason codes and descriptions
1671 */
1672static inline const char *
1673zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1674{
1675 const char *descr = "unknown reason code";
1676
1677 do {
1678 if (code == rc_table->code) {
1679 descr = rc_table->description;
1680 break;
1681 }
1682 rc_table++;
1683 } while (rc_table->code && rc_table->description);
1684
1685 return descr;
1686}
1687
1688/**
1689 * zfcp_check_ct_response - evaluate reason code for CT_IU
1690 * @rjt: response payload to an CT_IU request
1691 * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1692 */
1693int
1694zfcp_check_ct_response(struct ct_hdr *rjt)
1695{
1696 if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1697 return 0;
1698
1699 if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1700 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1701 "response code (0x%04hx)\n",
1702 rjt->cmd_rsp_code);
1703 return 1;
1704 }
1705
1706 ZFCP_LOG_INFO("Generic Service command rejected\n");
1707 ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1708 zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1709 (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1710 (u32) rjt->vendor_unique);
1711
1712 return 1;
1713}
1714
1715/**
1716 * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1717 * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1718 * @rc_table: table of reason codes and descriptions
1719 */
1720static inline void
1721zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1722 const struct zfcp_rc_entry *rc_table)
1723{
1724 ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1725 zfcp_rc_description(rjt_par->reason_code, rc_table),
1726 (u32) rjt_par->action, (u32) rjt_par->reason_code,
1727 (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1728}
1729
1730/**
1731 * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1732 * @sq: status qualifier word
1733 * @rjt_par: reject parameter as described in FC-PH and FC-FS
1734 * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1735 */
1736int
1737zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1738{
1739 int ret = -EIO;
1740
1741 if (sq == FSF_IOSTAT_NPORT_RJT) {
1742 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1743 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1744 /* invalid d_id */
1745 if (rjt_par->reason_code == 0x01)
1746 ret = -EREMCHG;
1747 } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1748 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1749 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1750 /* invalid d_id */
1751 if (rjt_par->reason_code == 0x01)
1752 ret = -EREMCHG;
1753 } else if (sq == FSF_IOSTAT_LS_RJT) {
1754 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1755 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1756 ret = -EREMOTEIO;
1757 } else
1758 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1759
1760 return ret;
1761}
1762
1763#undef ZFCP_LOG_AREA
Linux 6.x block layer and io_uring tree(s)