[SCSI] zfcp: print S_ID and D_ID with 3 bytes
[linux-2.6.git] / drivers / s390 / scsi / zfcp_aux.c
1 /*
2  * This file is part of the zfcp device driver for
3  * FCP adapters for IBM System z9 and zSeries.
4  *
5  * (C) Copyright IBM Corp. 2002, 2006
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20  */
21
22 /*
23  * Driver authors:
24  *            Martin Peschke (originator of the driver)
25  *            Raimund Schroeder
26  *            Aron Zeh
27  *            Wolfgang Taphorn
28  *            Stefan Bader
29  *            Heiko Carstens (kernel 2.6 port of the driver)
30  *            Andreas Herrmann
31  *            Maxim Shchetynin
32  *            Volker Sameske
33  *            Ralph Wuerthner
34  */
35
36 #include "zfcp_ext.h"
37
38 /* accumulated log level (module parameter) */
39 static u32 loglevel = ZFCP_LOG_LEVEL_DEFAULTS;
40 static char *device;
41 /*********************** FUNCTION PROTOTYPES *********************************/
42
43 /* written against the module interface */
44 static int __init  zfcp_module_init(void);
45
46 /* FCP related */
47 static void zfcp_ns_gid_pn_handler(unsigned long);
48
49 /* miscellaneous */
50 static int zfcp_sg_list_alloc(struct zfcp_sg_list *, size_t);
51 static void zfcp_sg_list_free(struct zfcp_sg_list *);
52 static int zfcp_sg_list_copy_from_user(struct zfcp_sg_list *,
53                                        void __user *, size_t);
54 static int zfcp_sg_list_copy_to_user(void __user *,
55                                      struct zfcp_sg_list *, size_t);
56 static long zfcp_cfdc_dev_ioctl(struct file *, 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
63 static const struct file_operations zfcp_cfdc_fops = {
64         .unlocked_ioctl = zfcp_cfdc_dev_ioctl,
65 #ifdef CONFIG_COMPAT
66         .compat_ioctl = zfcp_cfdc_dev_ioctl
67 #endif
68 };
69
70 static 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 */
79 module_init(zfcp_module_init);
80
81 MODULE_AUTHOR("IBM Deutschland Entwicklung GmbH - linux390@de.ibm.com");
82 MODULE_DESCRIPTION
83     ("FCP (SCSI over Fibre Channel) HBA driver for IBM System z9 and zSeries");
84 MODULE_LICENSE("GPL");
85
86 module_param(device, charp, 0400);
87 MODULE_PARM_DESC(device, "specify initial device");
88
89 module_param(loglevel, uint, 0400);
90 MODULE_PARM_DESC(loglevel,
91                  "log levels, 8 nibbles: "
92                  "FC ERP QDIO CIO Config FSF SCSI Other, "
93                  "levels: 0=none 1=normal 2=devel 3=trace");
94
95 /****************************************************************/
96 /************** Functions without logging ***********************/
97 /****************************************************************/
98
99 void
100 _zfcp_hex_dump(char *addr, int count)
101 {
102         int i;
103         for (i = 0; i < count; i++) {
104                 printk("%02x", addr[i]);
105                 if ((i % 4) == 3)
106                         printk(" ");
107                 if ((i % 32) == 31)
108                         printk("\n");
109         }
110         if (((i-1) % 32) != 31)
111                 printk("\n");
112 }
113
114
115 /****************************************************************/
116 /****** Functions to handle the request ID hash table    ********/
117 /****************************************************************/
118
119 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FSF
120
121 static int zfcp_reqlist_init(struct zfcp_adapter *adapter)
122 {
123         int i;
124
125         adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
126                                     GFP_KERNEL);
127
128         if (!adapter->req_list)
129                 return -ENOMEM;
130
131         for (i=0; i<REQUEST_LIST_SIZE; i++)
132                 INIT_LIST_HEAD(&adapter->req_list[i]);
133
134         return 0;
135 }
136
137 static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
138 {
139         struct zfcp_fsf_req *request, *tmp;
140         unsigned int i;
141
142         for (i=0; i<REQUEST_LIST_SIZE; i++) {
143                 if (list_empty(&adapter->req_list[i]))
144                         continue;
145
146                 list_for_each_entry_safe(request, tmp,
147                                          &adapter->req_list[i], list)
148                         list_del(&request->list);
149         }
150
151         kfree(adapter->req_list);
152 }
153
154 void zfcp_reqlist_add(struct zfcp_adapter *adapter,
155                       struct zfcp_fsf_req *fsf_req)
156 {
157         unsigned int i;
158
159         i = fsf_req->req_id % REQUEST_LIST_SIZE;
160         list_add_tail(&fsf_req->list, &adapter->req_list[i]);
161 }
162
163 void zfcp_reqlist_remove(struct zfcp_adapter *adapter, unsigned long req_id)
164 {
165         struct zfcp_fsf_req *request, *tmp;
166         unsigned int i, counter;
167         u64 dbg_tmp[2];
168
169         i = req_id % REQUEST_LIST_SIZE;
170         BUG_ON(list_empty(&adapter->req_list[i]));
171
172         counter = 0;
173         list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list) {
174                 if (request->req_id == req_id) {
175                         dbg_tmp[0] = (u64) atomic_read(&adapter->reqs_active);
176                         dbg_tmp[1] = (u64) counter;
177                         debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
178                         list_del(&request->list);
179                         break;
180                 }
181                 counter++;
182         }
183 }
184
185 struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *adapter,
186                                            unsigned long req_id)
187 {
188         struct zfcp_fsf_req *request, *tmp;
189         unsigned int i;
190
191         /* 0 is reserved as an invalid req_id */
192         if (req_id == 0)
193                 return NULL;
194
195         i = req_id % REQUEST_LIST_SIZE;
196
197         list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list)
198                 if (request->req_id == req_id)
199                         return request;
200
201         return NULL;
202 }
203
204 int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
205 {
206         unsigned int i;
207
208         for (i=0; i<REQUEST_LIST_SIZE; i++)
209                 if (!list_empty(&adapter->req_list[i]))
210                         return 0;
211
212         return 1;
213 }
214
215 #undef ZFCP_LOG_AREA
216
217 /****************************************************************/
218 /************** Uncategorised Functions *************************/
219 /****************************************************************/
220
221 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_OTHER
222
223 /**
224  * zfcp_device_setup - setup function
225  * @str: pointer to parameter string
226  *
227  * Parse "device=..." parameter string.
228  */
229 static int __init
230 zfcp_device_setup(char *devstr)
231 {
232         char *tmp, *str;
233         size_t len;
234
235         if (!devstr)
236                 return 0;
237
238         len = strlen(devstr) + 1;
239         str = kmalloc(len, GFP_KERNEL);
240         if (!str)
241                 goto err_out;
242         memcpy(str, devstr, len);
243
244         tmp = strchr(str, ',');
245         if (!tmp)
246                 goto err_out;
247         *tmp++ = '\0';
248         strncpy(zfcp_data.init_busid, str, BUS_ID_SIZE);
249         zfcp_data.init_busid[BUS_ID_SIZE-1] = '\0';
250
251         zfcp_data.init_wwpn = simple_strtoull(tmp, &tmp, 0);
252         if (*tmp++ != ',')
253                 goto err_out;
254         if (*tmp == '\0')
255                 goto err_out;
256
257         zfcp_data.init_fcp_lun = simple_strtoull(tmp, &tmp, 0);
258         if (*tmp != '\0')
259                 goto err_out;
260         kfree(str);
261         return 1;
262
263  err_out:
264         ZFCP_LOG_NORMAL("Parse error for device parameter string %s\n", str);
265         kfree(str);
266         return 0;
267 }
268
269 static void __init
270 zfcp_init_device_configure(void)
271 {
272         struct zfcp_adapter *adapter;
273         struct zfcp_port *port;
274         struct zfcp_unit *unit;
275
276         down(&zfcp_data.config_sema);
277         read_lock_irq(&zfcp_data.config_lock);
278         adapter = zfcp_get_adapter_by_busid(zfcp_data.init_busid);
279         if (adapter)
280                 zfcp_adapter_get(adapter);
281         read_unlock_irq(&zfcp_data.config_lock);
282
283         if (adapter == NULL)
284                 goto out_adapter;
285         port = zfcp_port_enqueue(adapter, zfcp_data.init_wwpn, 0, 0);
286         if (!port)
287                 goto out_port;
288         unit = zfcp_unit_enqueue(port, zfcp_data.init_fcp_lun);
289         if (!unit)
290                 goto out_unit;
291         up(&zfcp_data.config_sema);
292         ccw_device_set_online(adapter->ccw_device);
293         zfcp_erp_wait(adapter);
294         down(&zfcp_data.config_sema);
295         zfcp_unit_put(unit);
296  out_unit:
297         zfcp_port_put(port);
298  out_port:
299         zfcp_adapter_put(adapter);
300  out_adapter:
301         up(&zfcp_data.config_sema);
302         return;
303 }
304
305 static int calc_alignment(int size)
306 {
307         int align = 1;
308
309         if (!size)
310                 return 0;
311
312         while ((size - align) > 0)
313                 align <<= 1;
314
315         return align;
316 }
317
318 static int __init
319 zfcp_module_init(void)
320 {
321         int retval = -ENOMEM;
322         int size, align;
323
324         size = sizeof(struct zfcp_fsf_req_qtcb);
325         align = calc_alignment(size);
326         zfcp_data.fsf_req_qtcb_cache =
327                 kmem_cache_create("zfcp_fsf", size, align, 0, NULL, NULL);
328         if (!zfcp_data.fsf_req_qtcb_cache)
329                 goto out;
330
331         size = sizeof(struct fsf_status_read_buffer);
332         align = calc_alignment(size);
333         zfcp_data.sr_buffer_cache =
334                 kmem_cache_create("zfcp_sr", size, align, 0, NULL, NULL);
335         if (!zfcp_data.sr_buffer_cache)
336                 goto out_sr_cache;
337
338         size = sizeof(struct zfcp_gid_pn_data);
339         align = calc_alignment(size);
340         zfcp_data.gid_pn_cache =
341                 kmem_cache_create("zfcp_gid", size, align, 0, NULL, NULL);
342         if (!zfcp_data.gid_pn_cache)
343                 goto out_gid_cache;
344
345         atomic_set(&zfcp_data.loglevel, loglevel);
346
347         /* initialize adapter list */
348         INIT_LIST_HEAD(&zfcp_data.adapter_list_head);
349
350         /* initialize adapters to be removed list head */
351         INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
352
353         zfcp_data.scsi_transport_template =
354                 fc_attach_transport(&zfcp_transport_functions);
355         if (!zfcp_data.scsi_transport_template)
356                 goto out_transport;
357
358         retval = misc_register(&zfcp_cfdc_misc);
359         if (retval != 0) {
360                 ZFCP_LOG_INFO("registration of misc device "
361                               "zfcp_cfdc failed\n");
362                 goto out_misc;
363         }
364
365         ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
366                        ZFCP_CFDC_DEV_MAJOR, zfcp_cfdc_misc.minor);
367
368         /* Initialise proc semaphores */
369         sema_init(&zfcp_data.config_sema, 1);
370
371         /* initialise configuration rw lock */
372         rwlock_init(&zfcp_data.config_lock);
373
374         /* setup dynamic I/O */
375         retval = zfcp_ccw_register();
376         if (retval) {
377                 ZFCP_LOG_NORMAL("registration with common I/O layer failed\n");
378                 goto out_ccw_register;
379         }
380
381         if (zfcp_device_setup(device))
382                 zfcp_init_device_configure();
383
384         goto out;
385
386  out_ccw_register:
387         misc_deregister(&zfcp_cfdc_misc);
388  out_misc:
389         fc_release_transport(zfcp_data.scsi_transport_template);
390  out_transport:
391         kmem_cache_destroy(zfcp_data.gid_pn_cache);
392  out_gid_cache:
393         kmem_cache_destroy(zfcp_data.sr_buffer_cache);
394  out_sr_cache:
395         kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
396  out:
397         return retval;
398 }
399
400 /*
401  * function:    zfcp_cfdc_dev_ioctl
402  *
403  * purpose:     Handle control file upload/download transaction via IOCTL
404  *              interface
405  *
406  * returns:     0           - Operation completed successfuly
407  *              -ENOTTY     - Unknown IOCTL command
408  *              -EINVAL     - Invalid sense data record
409  *              -ENXIO      - The FCP adapter is not available
410  *              -EOPNOTSUPP - The FCP adapter does not have CFDC support
411  *              -ENOMEM     - Insufficient memory
412  *              -EFAULT     - User space memory I/O operation fault
413  *              -EPERM      - Cannot create or queue FSF request or create SBALs
414  *              -ERESTARTSYS- Received signal (is mapped to EAGAIN by VFS)
415  */
416 static long
417 zfcp_cfdc_dev_ioctl(struct file *file, unsigned int command,
418                     unsigned long buffer)
419 {
420         struct zfcp_cfdc_sense_data *sense_data, __user *sense_data_user;
421         struct zfcp_adapter *adapter = NULL;
422         struct zfcp_fsf_req *fsf_req = NULL;
423         struct zfcp_sg_list *sg_list = NULL;
424         u32 fsf_command, option;
425         char *bus_id = NULL;
426         int retval = 0;
427
428         sense_data = kmalloc(sizeof(struct zfcp_cfdc_sense_data), GFP_KERNEL);
429         if (sense_data == NULL) {
430                 retval = -ENOMEM;
431                 goto out;
432         }
433
434         sg_list = kzalloc(sizeof(struct zfcp_sg_list), GFP_KERNEL);
435         if (sg_list == NULL) {
436                 retval = -ENOMEM;
437                 goto out;
438         }
439
440         if (command != ZFCP_CFDC_IOC) {
441                 ZFCP_LOG_INFO("IOC request code 0x%x invalid\n", command);
442                 retval = -ENOTTY;
443                 goto out;
444         }
445
446         if ((sense_data_user = (void __user *) buffer) == NULL) {
447                 ZFCP_LOG_INFO("sense data record is required\n");
448                 retval = -EINVAL;
449                 goto out;
450         }
451
452         retval = copy_from_user(sense_data, sense_data_user,
453                                 sizeof(struct zfcp_cfdc_sense_data));
454         if (retval) {
455                 retval = -EFAULT;
456                 goto out;
457         }
458
459         if (sense_data->signature != ZFCP_CFDC_SIGNATURE) {
460                 ZFCP_LOG_INFO("invalid sense data request signature 0x%08x\n",
461                               ZFCP_CFDC_SIGNATURE);
462                 retval = -EINVAL;
463                 goto out;
464         }
465
466         switch (sense_data->command) {
467
468         case ZFCP_CFDC_CMND_DOWNLOAD_NORMAL:
469                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
470                 option = FSF_CFDC_OPTION_NORMAL_MODE;
471                 break;
472
473         case ZFCP_CFDC_CMND_DOWNLOAD_FORCE:
474                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
475                 option = FSF_CFDC_OPTION_FORCE;
476                 break;
477
478         case ZFCP_CFDC_CMND_FULL_ACCESS:
479                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
480                 option = FSF_CFDC_OPTION_FULL_ACCESS;
481                 break;
482
483         case ZFCP_CFDC_CMND_RESTRICTED_ACCESS:
484                 fsf_command = FSF_QTCB_DOWNLOAD_CONTROL_FILE;
485                 option = FSF_CFDC_OPTION_RESTRICTED_ACCESS;
486                 break;
487
488         case ZFCP_CFDC_CMND_UPLOAD:
489                 fsf_command = FSF_QTCB_UPLOAD_CONTROL_FILE;
490                 option = 0;
491                 break;
492
493         default:
494                 ZFCP_LOG_INFO("invalid command code 0x%08x\n",
495                               sense_data->command);
496                 retval = -EINVAL;
497                 goto out;
498         }
499
500         bus_id = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
501         if (bus_id == NULL) {
502                 retval = -ENOMEM;
503                 goto out;
504         }
505         snprintf(bus_id, BUS_ID_SIZE, "%d.%d.%04x",
506                 (sense_data->devno >> 24),
507                 (sense_data->devno >> 16) & 0xFF,
508                 (sense_data->devno & 0xFFFF));
509
510         read_lock_irq(&zfcp_data.config_lock);
511         adapter = zfcp_get_adapter_by_busid(bus_id);
512         if (adapter)
513                 zfcp_adapter_get(adapter);
514         read_unlock_irq(&zfcp_data.config_lock);
515
516         kfree(bus_id);
517
518         if (adapter == NULL) {
519                 ZFCP_LOG_INFO("invalid adapter\n");
520                 retval = -ENXIO;
521                 goto out;
522         }
523
524         if (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE) {
525                 retval = zfcp_sg_list_alloc(sg_list,
526                                             ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
527                 if (retval) {
528                         retval = -ENOMEM;
529                         goto out;
530                 }
531         }
532
533         if ((sense_data->command & ZFCP_CFDC_DOWNLOAD) &&
534             (sense_data->command & ZFCP_CFDC_WITH_CONTROL_FILE)) {
535                 retval = zfcp_sg_list_copy_from_user(
536                         sg_list, &sense_data_user->control_file,
537                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
538                 if (retval) {
539                         retval = -EFAULT;
540                         goto out;
541                 }
542         }
543
544         retval = zfcp_fsf_control_file(adapter, &fsf_req, fsf_command,
545                                        option, sg_list);
546         if (retval)
547                 goto out;
548
549         if ((fsf_req->qtcb->prefix.prot_status != FSF_PROT_GOOD) &&
550             (fsf_req->qtcb->prefix.prot_status != FSF_PROT_FSF_STATUS_PRESENTED)) {
551                 retval = -ENXIO;
552                 goto out;
553         }
554
555         sense_data->fsf_status = fsf_req->qtcb->header.fsf_status;
556         memcpy(&sense_data->fsf_status_qual,
557                &fsf_req->qtcb->header.fsf_status_qual,
558                sizeof(union fsf_status_qual));
559         memcpy(&sense_data->payloads, &fsf_req->qtcb->bottom.support.els, 256);
560
561         retval = copy_to_user(sense_data_user, sense_data,
562                 sizeof(struct zfcp_cfdc_sense_data));
563         if (retval) {
564                 retval = -EFAULT;
565                 goto out;
566         }
567
568         if (sense_data->command & ZFCP_CFDC_UPLOAD) {
569                 retval = zfcp_sg_list_copy_to_user(
570                         &sense_data_user->control_file, sg_list,
571                         ZFCP_CFDC_MAX_CONTROL_FILE_SIZE);
572                 if (retval) {
573                         retval = -EFAULT;
574                         goto out;
575                 }
576         }
577
578  out:
579         if (fsf_req != NULL)
580                 zfcp_fsf_req_free(fsf_req);
581
582         if ((adapter != NULL) && (retval != -ENXIO))
583                 zfcp_adapter_put(adapter);
584
585         if (sg_list != NULL) {
586                 zfcp_sg_list_free(sg_list);
587                 kfree(sg_list);
588         }
589
590         kfree(sense_data);
591
592         return retval;
593 }
594
595
596 /**
597  * zfcp_sg_list_alloc - create a scatter-gather list of the specified size
598  * @sg_list: structure describing a scatter gather list
599  * @size: size of scatter-gather list
600  * Return: 0 on success, else -ENOMEM
601  *
602  * In sg_list->sg a pointer to the created scatter-gather list is returned,
603  * or NULL if we run out of memory. sg_list->count specifies the number of
604  * elements of the scatter-gather list. The maximum size of a single element
605  * in the scatter-gather list is PAGE_SIZE.
606  */
607 static int
608 zfcp_sg_list_alloc(struct zfcp_sg_list *sg_list, size_t size)
609 {
610         struct scatterlist *sg;
611         unsigned int i;
612         int retval = 0;
613         void *address;
614
615         BUG_ON(sg_list == NULL);
616
617         sg_list->count = size >> PAGE_SHIFT;
618         if (size & ~PAGE_MASK)
619                 sg_list->count++;
620         sg_list->sg = kcalloc(sg_list->count, sizeof(struct scatterlist),
621                               GFP_KERNEL);
622         if (sg_list->sg == NULL) {
623                 sg_list->count = 0;
624                 retval = -ENOMEM;
625                 goto out;
626         }
627
628         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++) {
629                 sg->length = min(size, PAGE_SIZE);
630                 sg->offset = 0;
631                 address = (void *) get_zeroed_page(GFP_KERNEL);
632                 if (address == NULL) {
633                         sg_list->count = i;
634                         zfcp_sg_list_free(sg_list);
635                         retval = -ENOMEM;
636                         goto out;
637                 }
638                 zfcp_address_to_sg(address, sg);
639                 size -= sg->length;
640         }
641
642  out:
643         return retval;
644 }
645
646
647 /**
648  * zfcp_sg_list_free - free memory of a scatter-gather list
649  * @sg_list: structure describing a scatter-gather list
650  *
651  * Memory for each element in the scatter-gather list is freed.
652  * Finally sg_list->sg is freed itself and sg_list->count is reset.
653  */
654 static void
655 zfcp_sg_list_free(struct zfcp_sg_list *sg_list)
656 {
657         struct scatterlist *sg;
658         unsigned int i;
659
660         BUG_ON(sg_list == NULL);
661
662         for (i = 0, sg = sg_list->sg; i < sg_list->count; i++, sg++)
663                 free_page((unsigned long) zfcp_sg_to_address(sg));
664
665         sg_list->count = 0;
666         kfree(sg_list->sg);
667 }
668
669 /**
670  * zfcp_sg_size - determine size of a scatter-gather list
671  * @sg: array of (struct scatterlist)
672  * @sg_count: elements in array
673  * Return: size of entire scatter-gather list
674  */
675 size_t
676 zfcp_sg_size(struct scatterlist *sg, unsigned int sg_count)
677 {
678         unsigned int i;
679         struct scatterlist *p;
680         size_t size;
681
682         size = 0;
683         for (i = 0, p = sg; i < sg_count; i++, p++) {
684                 BUG_ON(p == NULL);
685                 size += p->length;
686         }
687
688         return size;
689 }
690
691
692 /**
693  * zfcp_sg_list_copy_from_user -copy data from user space to scatter-gather list
694  * @sg_list: structure describing a scatter-gather list
695  * @user_buffer: pointer to buffer in user space
696  * @size: number of bytes to be copied
697  * Return: 0 on success, -EFAULT if copy_from_user fails.
698  */
699 static int
700 zfcp_sg_list_copy_from_user(struct zfcp_sg_list *sg_list,
701                             void __user *user_buffer,
702                             size_t size)
703 {
704         struct scatterlist *sg;
705         unsigned int length;
706         void *zfcp_buffer;
707         int retval = 0;
708
709         BUG_ON(sg_list == NULL);
710
711         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
712                 return -EFAULT;
713
714         for (sg = sg_list->sg; size > 0; sg++) {
715                 length = min((unsigned int)size, sg->length);
716                 zfcp_buffer = zfcp_sg_to_address(sg);
717                 if (copy_from_user(zfcp_buffer, user_buffer, length)) {
718                         retval = -EFAULT;
719                         goto out;
720                 }
721                 user_buffer += length;
722                 size -= length;
723         }
724
725  out:
726         return retval;
727 }
728
729
730 /**
731  * zfcp_sg_list_copy_to_user - copy data from scatter-gather list to user space
732  * @user_buffer: pointer to buffer in user space
733  * @sg_list: structure describing a scatter-gather list
734  * @size: number of bytes to be copied
735  * Return: 0 on success, -EFAULT if copy_to_user fails
736  */
737 static int
738 zfcp_sg_list_copy_to_user(void __user  *user_buffer,
739                           struct zfcp_sg_list *sg_list,
740                           size_t size)
741 {
742         struct scatterlist *sg;
743         unsigned int length;
744         void *zfcp_buffer;
745         int retval = 0;
746
747         BUG_ON(sg_list == NULL);
748
749         if (zfcp_sg_size(sg_list->sg, sg_list->count) < size)
750                 return -EFAULT;
751
752         for (sg = sg_list->sg; size > 0; sg++) {
753                 length = min((unsigned int) size, sg->length);
754                 zfcp_buffer = zfcp_sg_to_address(sg);
755                 if (copy_to_user(user_buffer, zfcp_buffer, length)) {
756                         retval = -EFAULT;
757                         goto out;
758                 }
759                 user_buffer += length;
760                 size -= length;
761         }
762
763  out:
764         return retval;
765 }
766
767
768 #undef ZFCP_LOG_AREA
769
770 /****************************************************************/
771 /****** Functions for configuration/set-up of structures ********/
772 /****************************************************************/
773
774 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
775
776 /**
777  * zfcp_get_unit_by_lun - find unit in unit list of port by FCP LUN
778  * @port: pointer to port to search for unit
779  * @fcp_lun: FCP LUN to search for
780  * Traverse list of all units of a port and return pointer to a unit
781  * with the given FCP LUN.
782  */
783 struct zfcp_unit *
784 zfcp_get_unit_by_lun(struct zfcp_port *port, fcp_lun_t fcp_lun)
785 {
786         struct zfcp_unit *unit;
787         int found = 0;
788
789         list_for_each_entry(unit, &port->unit_list_head, list) {
790                 if ((unit->fcp_lun == fcp_lun) &&
791                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status))
792                 {
793                         found = 1;
794                         break;
795                 }
796         }
797         return found ? unit : NULL;
798 }
799
800 /**
801  * zfcp_get_port_by_wwpn - find port in port list of adapter by wwpn
802  * @adapter: pointer to adapter to search for port
803  * @wwpn: wwpn to search for
804  * Traverse list of all ports of an adapter and return pointer to a port
805  * with the given wwpn.
806  */
807 struct zfcp_port *
808 zfcp_get_port_by_wwpn(struct zfcp_adapter *adapter, wwn_t wwpn)
809 {
810         struct zfcp_port *port;
811         int found = 0;
812
813         list_for_each_entry(port, &adapter->port_list_head, list) {
814                 if ((port->wwpn == wwpn) &&
815                     !(atomic_read(&port->status) &
816                       (ZFCP_STATUS_PORT_NO_WWPN | ZFCP_STATUS_COMMON_REMOVE))) {
817                         found = 1;
818                         break;
819                 }
820         }
821         return found ? port : NULL;
822 }
823
824 /**
825  * zfcp_get_port_by_did - find port in port list of adapter by d_id
826  * @adapter: pointer to adapter to search for port
827  * @d_id: d_id to search for
828  * Traverse list of all ports of an adapter and return pointer to a port
829  * with the given d_id.
830  */
831 struct zfcp_port *
832 zfcp_get_port_by_did(struct zfcp_adapter *adapter, u32 d_id)
833 {
834         struct zfcp_port *port;
835         int found = 0;
836
837         list_for_each_entry(port, &adapter->port_list_head, list) {
838                 if ((port->d_id == d_id) &&
839                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status))
840                 {
841                         found = 1;
842                         break;
843                 }
844         }
845         return found ? port : NULL;
846 }
847
848 /**
849  * zfcp_get_adapter_by_busid - find adpater in adapter list by bus_id
850  * @bus_id: bus_id to search for
851  * Traverse list of all adapters and return pointer to an adapter
852  * with the given bus_id.
853  */
854 struct zfcp_adapter *
855 zfcp_get_adapter_by_busid(char *bus_id)
856 {
857         struct zfcp_adapter *adapter;
858         int found = 0;
859
860         list_for_each_entry(adapter, &zfcp_data.adapter_list_head, list) {
861                 if ((strncmp(bus_id, zfcp_get_busid_by_adapter(adapter),
862                              BUS_ID_SIZE) == 0) &&
863                     !atomic_test_mask(ZFCP_STATUS_COMMON_REMOVE,
864                                       &adapter->status)){
865                         found = 1;
866                         break;
867                 }
868         }
869         return found ? adapter : NULL;
870 }
871
872 /**
873  * zfcp_unit_enqueue - enqueue unit to unit list of a port.
874  * @port: pointer to port where unit is added
875  * @fcp_lun: FCP LUN of unit to be enqueued
876  * Return: pointer to enqueued unit on success, NULL on error
877  * Locks: config_sema must be held to serialize changes to the unit list
878  *
879  * Sets up some unit internal structures and creates sysfs entry.
880  */
881 struct zfcp_unit *
882 zfcp_unit_enqueue(struct zfcp_port *port, fcp_lun_t fcp_lun)
883 {
884         struct zfcp_unit *unit, *tmp_unit;
885         unsigned int scsi_lun;
886         int found;
887
888         /*
889          * check that there is no unit with this FCP_LUN already in list
890          * and enqueue it.
891          * Note: Unlike for the adapter and the port, this is an error
892          */
893         read_lock_irq(&zfcp_data.config_lock);
894         unit = zfcp_get_unit_by_lun(port, fcp_lun);
895         read_unlock_irq(&zfcp_data.config_lock);
896         if (unit)
897                 return NULL;
898
899         unit = kzalloc(sizeof (struct zfcp_unit), GFP_KERNEL);
900         if (!unit)
901                 return NULL;
902
903         /* initialise reference count stuff */
904         atomic_set(&unit->refcount, 0);
905         init_waitqueue_head(&unit->remove_wq);
906
907         unit->port = port;
908         unit->fcp_lun = fcp_lun;
909
910         /* setup for sysfs registration */
911         snprintf(unit->sysfs_device.bus_id, BUS_ID_SIZE, "0x%016llx", fcp_lun);
912         unit->sysfs_device.parent = &port->sysfs_device;
913         unit->sysfs_device.release = zfcp_sysfs_unit_release;
914         dev_set_drvdata(&unit->sysfs_device, unit);
915
916         /* mark unit unusable as long as sysfs registration is not complete */
917         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
918
919         if (device_register(&unit->sysfs_device)) {
920                 kfree(unit);
921                 return NULL;
922         }
923
924         if (zfcp_sysfs_unit_create_files(&unit->sysfs_device)) {
925                 device_unregister(&unit->sysfs_device);
926                 return NULL;
927         }
928
929         zfcp_unit_get(unit);
930
931         scsi_lun = 0;
932         found = 0;
933         write_lock_irq(&zfcp_data.config_lock);
934         list_for_each_entry(tmp_unit, &port->unit_list_head, list) {
935                 if (tmp_unit->scsi_lun != scsi_lun) {
936                         found = 1;
937                         break;
938                 }
939                 scsi_lun++;
940         }
941         unit->scsi_lun = scsi_lun;
942         if (found)
943                 list_add_tail(&unit->list, &tmp_unit->list);
944         else
945                 list_add_tail(&unit->list, &port->unit_list_head);
946         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &unit->status);
947         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status);
948         write_unlock_irq(&zfcp_data.config_lock);
949
950         port->units++;
951         zfcp_port_get(port);
952
953         return unit;
954 }
955
956 void
957 zfcp_unit_dequeue(struct zfcp_unit *unit)
958 {
959         zfcp_unit_wait(unit);
960         write_lock_irq(&zfcp_data.config_lock);
961         list_del(&unit->list);
962         write_unlock_irq(&zfcp_data.config_lock);
963         unit->port->units--;
964         zfcp_port_put(unit->port);
965         zfcp_sysfs_unit_remove_files(&unit->sysfs_device);
966         device_unregister(&unit->sysfs_device);
967 }
968
969 /*
970  * Allocates a combined QTCB/fsf_req buffer for erp actions and fcp/SCSI
971  * commands.
972  * It also genrates fcp-nameserver request/response buffer and unsolicited 
973  * status read fsf_req buffers.
974  *
975  * locks:       must only be called with zfcp_data.config_sema taken
976  */
977 static int
978 zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
979 {
980         adapter->pool.fsf_req_erp =
981                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
982                                          zfcp_data.fsf_req_qtcb_cache);
983         if (!adapter->pool.fsf_req_erp)
984                 return -ENOMEM;
985
986         adapter->pool.fsf_req_scsi =
987                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
988                                          zfcp_data.fsf_req_qtcb_cache);
989         if (!adapter->pool.fsf_req_scsi)
990                 return -ENOMEM;
991
992         adapter->pool.fsf_req_abort =
993                 mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
994                                          zfcp_data.fsf_req_qtcb_cache);
995         if (!adapter->pool.fsf_req_abort)
996                 return -ENOMEM;
997
998         adapter->pool.fsf_req_status_read =
999                 mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
1000                                             sizeof(struct zfcp_fsf_req));
1001         if (!adapter->pool.fsf_req_status_read)
1002                 return -ENOMEM;
1003
1004         adapter->pool.data_status_read =
1005                 mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
1006                                          zfcp_data.sr_buffer_cache);
1007         if (!adapter->pool.data_status_read)
1008                 return -ENOMEM;
1009
1010         adapter->pool.data_gid_pn =
1011                 mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
1012                                          zfcp_data.gid_pn_cache);
1013         if (!adapter->pool.data_gid_pn)
1014                 return -ENOMEM;
1015
1016         return 0;
1017 }
1018
1019 /**
1020  * zfcp_free_low_mem_buffers - free memory pools of an adapter
1021  * @adapter: pointer to zfcp_adapter for which memory pools should be freed
1022  * locking:  zfcp_data.config_sema must be held
1023  */
1024 static void
1025 zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
1026 {
1027         if (adapter->pool.fsf_req_erp)
1028                 mempool_destroy(adapter->pool.fsf_req_erp);
1029         if (adapter->pool.fsf_req_scsi)
1030                 mempool_destroy(adapter->pool.fsf_req_scsi);
1031         if (adapter->pool.fsf_req_abort)
1032                 mempool_destroy(adapter->pool.fsf_req_abort);
1033         if (adapter->pool.fsf_req_status_read)
1034                 mempool_destroy(adapter->pool.fsf_req_status_read);
1035         if (adapter->pool.data_status_read)
1036                 mempool_destroy(adapter->pool.data_status_read);
1037         if (adapter->pool.data_gid_pn)
1038                 mempool_destroy(adapter->pool.data_gid_pn);
1039 }
1040
1041 void
1042 zfcp_dummy_release(struct device *dev)
1043 {
1044         return;
1045 }
1046
1047 /*
1048  * Enqueues an adapter at the end of the adapter list in the driver data.
1049  * All adapter internal structures are set up.
1050  * Proc-fs entries are also created.
1051  *
1052  * returns:     0             if a new adapter was successfully enqueued
1053  *              ZFCP_KNOWN    if an adapter with this devno was already present
1054  *              -ENOMEM       if alloc failed
1055  * locks:       config_sema must be held to serialise changes to the adapter list
1056  */
1057 struct zfcp_adapter *
1058 zfcp_adapter_enqueue(struct ccw_device *ccw_device)
1059 {
1060         int retval = 0;
1061         struct zfcp_adapter *adapter;
1062
1063         /*
1064          * Note: It is safe to release the list_lock, as any list changes 
1065          * are protected by the config_sema, which must be held to get here
1066          */
1067
1068         /* try to allocate new adapter data structure (zeroed) */
1069         adapter = kzalloc(sizeof (struct zfcp_adapter), GFP_KERNEL);
1070         if (!adapter) {
1071                 ZFCP_LOG_INFO("error: allocation of base adapter "
1072                               "structure failed\n");
1073                 goto out;
1074         }
1075
1076         ccw_device->handler = NULL;
1077
1078         /* save ccw_device pointer */
1079         adapter->ccw_device = ccw_device;
1080
1081         retval = zfcp_qdio_allocate_queues(adapter);
1082         if (retval)
1083                 goto queues_alloc_failed;
1084
1085         retval = zfcp_qdio_allocate(adapter);
1086         if (retval)
1087                 goto qdio_allocate_failed;
1088
1089         retval = zfcp_allocate_low_mem_buffers(adapter);
1090         if (retval) {
1091                 ZFCP_LOG_INFO("error: pool allocation failed\n");
1092                 goto failed_low_mem_buffers;
1093         }
1094
1095         /* initialise reference count stuff */
1096         atomic_set(&adapter->refcount, 0);
1097         init_waitqueue_head(&adapter->remove_wq);
1098
1099         /* initialise list of ports */
1100         INIT_LIST_HEAD(&adapter->port_list_head);
1101
1102         /* initialise list of ports to be removed */
1103         INIT_LIST_HEAD(&adapter->port_remove_lh);
1104
1105         /* initialize list of fsf requests */
1106         spin_lock_init(&adapter->req_list_lock);
1107         retval = zfcp_reqlist_init(adapter);
1108         if (retval) {
1109                 ZFCP_LOG_INFO("request list initialization failed\n");
1110                 goto failed_low_mem_buffers;
1111         }
1112
1113         /* initialize debug locks */
1114
1115         spin_lock_init(&adapter->erp_dbf_lock);
1116         spin_lock_init(&adapter->hba_dbf_lock);
1117         spin_lock_init(&adapter->san_dbf_lock);
1118         spin_lock_init(&adapter->scsi_dbf_lock);
1119
1120         /* initialize error recovery stuff */
1121
1122         rwlock_init(&adapter->erp_lock);
1123         sema_init(&adapter->erp_ready_sem, 0);
1124         INIT_LIST_HEAD(&adapter->erp_ready_head);
1125         INIT_LIST_HEAD(&adapter->erp_running_head);
1126
1127         /* initialize abort lock */
1128         rwlock_init(&adapter->abort_lock);
1129
1130         /* initialise some erp stuff */
1131         init_waitqueue_head(&adapter->erp_thread_wqh);
1132         init_waitqueue_head(&adapter->erp_done_wqh);
1133
1134         /* initialize lock of associated request queue */
1135         rwlock_init(&adapter->request_queue.queue_lock);
1136
1137         /* mark adapter unusable as long as sysfs registration is not complete */
1138         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1139
1140         adapter->ccw_device = ccw_device;
1141         dev_set_drvdata(&ccw_device->dev, adapter);
1142
1143         if (zfcp_sysfs_adapter_create_files(&ccw_device->dev))
1144                 goto sysfs_failed;
1145
1146         adapter->generic_services.parent = &adapter->ccw_device->dev;
1147         adapter->generic_services.release = zfcp_dummy_release;
1148         snprintf(adapter->generic_services.bus_id, BUS_ID_SIZE,
1149                  "generic_services");
1150
1151         if (device_register(&adapter->generic_services))
1152                 goto generic_services_failed;
1153
1154         /* put allocated adapter at list tail */
1155         write_lock_irq(&zfcp_data.config_lock);
1156         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
1157         list_add_tail(&adapter->list, &zfcp_data.adapter_list_head);
1158         write_unlock_irq(&zfcp_data.config_lock);
1159
1160         zfcp_data.adapters++;
1161
1162         goto out;
1163
1164  generic_services_failed:
1165         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1166  sysfs_failed:
1167         dev_set_drvdata(&ccw_device->dev, NULL);
1168  failed_low_mem_buffers:
1169         zfcp_free_low_mem_buffers(adapter);
1170         if (qdio_free(ccw_device) != 0)
1171                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1172                                 zfcp_get_busid_by_adapter(adapter));
1173  qdio_allocate_failed:
1174         zfcp_qdio_free_queues(adapter);
1175  queues_alloc_failed:
1176         kfree(adapter);
1177         adapter = NULL;
1178  out:
1179         return adapter;
1180 }
1181
1182 /*
1183  * returns:     0 - struct zfcp_adapter  data structure successfully removed
1184  *              !0 - struct zfcp_adapter  data structure could not be removed
1185  *                      (e.g. still used)
1186  * locks:       adapter list write lock is assumed to be held by caller
1187  */
1188 void
1189 zfcp_adapter_dequeue(struct zfcp_adapter *adapter)
1190 {
1191         int retval = 0;
1192         unsigned long flags;
1193
1194         device_unregister(&adapter->generic_services);
1195         zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
1196         dev_set_drvdata(&adapter->ccw_device->dev, NULL);
1197         /* sanity check: no pending FSF requests */
1198         spin_lock_irqsave(&adapter->req_list_lock, flags);
1199         retval = zfcp_reqlist_isempty(adapter);
1200         spin_unlock_irqrestore(&adapter->req_list_lock, flags);
1201         if (!retval) {
1202                 ZFCP_LOG_NORMAL("bug: adapter %s (%p) still in use, "
1203                                 "%i requests outstanding\n",
1204                                 zfcp_get_busid_by_adapter(adapter), adapter,
1205                                 atomic_read(&adapter->reqs_active));
1206                 retval = -EBUSY;
1207                 goto out;
1208         }
1209
1210         /* remove specified adapter data structure from list */
1211         write_lock_irq(&zfcp_data.config_lock);
1212         list_del(&adapter->list);
1213         write_unlock_irq(&zfcp_data.config_lock);
1214
1215         /* decrease number of adapters in list */
1216         zfcp_data.adapters--;
1217
1218         ZFCP_LOG_TRACE("adapter %s (%p) removed from list, "
1219                        "%i adapters still in list\n",
1220                        zfcp_get_busid_by_adapter(adapter),
1221                        adapter, zfcp_data.adapters);
1222
1223         retval = qdio_free(adapter->ccw_device);
1224         if (retval)
1225                 ZFCP_LOG_NORMAL("bug: qdio_free for adapter %s failed\n",
1226                                 zfcp_get_busid_by_adapter(adapter));
1227
1228         zfcp_free_low_mem_buffers(adapter);
1229         /* free memory of adapter data structure and queues */
1230         zfcp_qdio_free_queues(adapter);
1231         zfcp_reqlist_free(adapter);
1232         kfree(adapter->fc_stats);
1233         kfree(adapter->stats_reset_data);
1234         ZFCP_LOG_TRACE("freeing adapter structure\n");
1235         kfree(adapter);
1236  out:
1237         return;
1238 }
1239
1240 /**
1241  * zfcp_port_enqueue - enqueue port to port list of adapter
1242  * @adapter: adapter where remote port is added
1243  * @wwpn: WWPN of the remote port to be enqueued
1244  * @status: initial status for the port
1245  * @d_id: destination id of the remote port to be enqueued
1246  * Return: pointer to enqueued port on success, NULL on error
1247  * Locks: config_sema must be held to serialize changes to the port list
1248  *
1249  * All port internal structures are set up and the sysfs entry is generated.
1250  * d_id is used to enqueue ports with a well known address like the Directory
1251  * Service for nameserver lookup.
1252  */
1253 struct zfcp_port *
1254 zfcp_port_enqueue(struct zfcp_adapter *adapter, wwn_t wwpn, u32 status,
1255                   u32 d_id)
1256 {
1257         struct zfcp_port *port;
1258         int check_wwpn;
1259
1260         check_wwpn = !(status & ZFCP_STATUS_PORT_NO_WWPN);
1261         /*
1262          * check that there is no port with this WWPN already in list
1263          */
1264         if (check_wwpn) {
1265                 read_lock_irq(&zfcp_data.config_lock);
1266                 port = zfcp_get_port_by_wwpn(adapter, wwpn);
1267                 read_unlock_irq(&zfcp_data.config_lock);
1268                 if (port)
1269                         return NULL;
1270         }
1271
1272         port = kzalloc(sizeof (struct zfcp_port), GFP_KERNEL);
1273         if (!port)
1274                 return NULL;
1275
1276         /* initialise reference count stuff */
1277         atomic_set(&port->refcount, 0);
1278         init_waitqueue_head(&port->remove_wq);
1279
1280         INIT_LIST_HEAD(&port->unit_list_head);
1281         INIT_LIST_HEAD(&port->unit_remove_lh);
1282
1283         port->adapter = adapter;
1284
1285         if (check_wwpn)
1286                 port->wwpn = wwpn;
1287
1288         atomic_set_mask(status, &port->status);
1289
1290         /* setup for sysfs registration */
1291         if (status & ZFCP_STATUS_PORT_WKA) {
1292                 switch (d_id) {
1293                 case ZFCP_DID_DIRECTORY_SERVICE:
1294                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1295                                  "directory");
1296                         break;
1297                 case ZFCP_DID_MANAGEMENT_SERVICE:
1298                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1299                                  "management");
1300                         break;
1301                 case ZFCP_DID_KEY_DISTRIBUTION_SERVICE:
1302                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1303                                  "key_distribution");
1304                         break;
1305                 case ZFCP_DID_ALIAS_SERVICE:
1306                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1307                                  "alias");
1308                         break;
1309                 case ZFCP_DID_TIME_SERVICE:
1310                         snprintf(port->sysfs_device.bus_id, BUS_ID_SIZE,
1311                                  "time");
1312                         break;
1313                 default:
1314                         kfree(port);
1315                         return NULL;
1316                 }
1317                 port->d_id = d_id;
1318                 port->sysfs_device.parent = &adapter->generic_services;
1319         } else {
1320                 snprintf(port->sysfs_device.bus_id,
1321                          BUS_ID_SIZE, "0x%016llx", wwpn);
1322                 port->sysfs_device.parent = &adapter->ccw_device->dev;
1323         }
1324         port->sysfs_device.release = zfcp_sysfs_port_release;
1325         dev_set_drvdata(&port->sysfs_device, port);
1326
1327         /* mark port unusable as long as sysfs registration is not complete */
1328         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1329
1330         if (device_register(&port->sysfs_device)) {
1331                 kfree(port);
1332                 return NULL;
1333         }
1334
1335         if (zfcp_sysfs_port_create_files(&port->sysfs_device, status)) {
1336                 device_unregister(&port->sysfs_device);
1337                 return NULL;
1338         }
1339
1340         zfcp_port_get(port);
1341
1342         write_lock_irq(&zfcp_data.config_lock);
1343         list_add_tail(&port->list, &adapter->port_list_head);
1344         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
1345         atomic_set_mask(ZFCP_STATUS_COMMON_RUNNING, &port->status);
1346         if (d_id == ZFCP_DID_DIRECTORY_SERVICE)
1347                 if (!adapter->nameserver_port)
1348                         adapter->nameserver_port = port;
1349         adapter->ports++;
1350         write_unlock_irq(&zfcp_data.config_lock);
1351
1352         zfcp_adapter_get(adapter);
1353
1354         return port;
1355 }
1356
1357 void
1358 zfcp_port_dequeue(struct zfcp_port *port)
1359 {
1360         zfcp_port_wait(port);
1361         write_lock_irq(&zfcp_data.config_lock);
1362         list_del(&port->list);
1363         port->adapter->ports--;
1364         write_unlock_irq(&zfcp_data.config_lock);
1365         if (port->rport)
1366                 fc_remote_port_delete(port->rport);
1367         port->rport = NULL;
1368         zfcp_adapter_put(port->adapter);
1369         zfcp_sysfs_port_remove_files(&port->sysfs_device,
1370                                      atomic_read(&port->status));
1371         device_unregister(&port->sysfs_device);
1372 }
1373
1374 /* Enqueues a nameserver port */
1375 int
1376 zfcp_nameserver_enqueue(struct zfcp_adapter *adapter)
1377 {
1378         struct zfcp_port *port;
1379
1380         port = zfcp_port_enqueue(adapter, 0, ZFCP_STATUS_PORT_WKA,
1381                                  ZFCP_DID_DIRECTORY_SERVICE);
1382         if (!port) {
1383                 ZFCP_LOG_INFO("error: enqueue of nameserver port for "
1384                               "adapter %s failed\n",
1385                               zfcp_get_busid_by_adapter(adapter));
1386                 return -ENXIO;
1387         }
1388         zfcp_port_put(port);
1389
1390         return 0;
1391 }
1392
1393 #undef ZFCP_LOG_AREA
1394
1395 /****************************************************************/
1396 /******* Fibre Channel Standard related Functions  **************/
1397 /****************************************************************/
1398
1399 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_FC
1400
1401 void
1402 zfcp_fsf_incoming_els_rscn(struct zfcp_adapter *adapter,
1403                            struct fsf_status_read_buffer *status_buffer)
1404 {
1405         struct fcp_rscn_head *fcp_rscn_head;
1406         struct fcp_rscn_element *fcp_rscn_element;
1407         struct zfcp_port *port;
1408         u16 i;
1409         u16 no_entries;
1410         u32 range_mask;
1411         unsigned long flags;
1412
1413         fcp_rscn_head = (struct fcp_rscn_head *) status_buffer->payload;
1414         fcp_rscn_element = (struct fcp_rscn_element *) status_buffer->payload;
1415
1416         /* see FC-FS */
1417         no_entries = (fcp_rscn_head->payload_len / 4);
1418
1419         for (i = 1; i < no_entries; i++) {
1420                 /* skip head and start with 1st element */
1421                 fcp_rscn_element++;
1422                 switch (fcp_rscn_element->addr_format) {
1423                 case ZFCP_PORT_ADDRESS:
1424                         range_mask = ZFCP_PORTS_RANGE_PORT;
1425                         break;
1426                 case ZFCP_AREA_ADDRESS:
1427                         range_mask = ZFCP_PORTS_RANGE_AREA;
1428                         break;
1429                 case ZFCP_DOMAIN_ADDRESS:
1430                         range_mask = ZFCP_PORTS_RANGE_DOMAIN;
1431                         break;
1432                 case ZFCP_FABRIC_ADDRESS:
1433                         range_mask = ZFCP_PORTS_RANGE_FABRIC;
1434                         break;
1435                 default:
1436                         ZFCP_LOG_INFO("incoming RSCN with unknown "
1437                                       "address format\n");
1438                         continue;
1439                 }
1440                 read_lock_irqsave(&zfcp_data.config_lock, flags);
1441                 list_for_each_entry(port, &adapter->port_list_head, list) {
1442                         if (atomic_test_mask
1443                             (ZFCP_STATUS_PORT_WKA, &port->status))
1444                                 continue;
1445                         /* Do we know this port? If not skip it. */
1446                         if (!atomic_test_mask
1447                             (ZFCP_STATUS_PORT_DID_DID, &port->status)) {
1448                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1449                                               "port 0x%016Lx\n", port->wwpn);
1450                                 zfcp_erp_port_reopen(port,
1451                                                      ZFCP_STATUS_COMMON_ERP_FAILED);
1452                                 continue;
1453                         }
1454
1455                         /*
1456                          * FIXME: race: d_id might being invalidated
1457                          * (...DID_DID reset)
1458                          */
1459                         if ((port->d_id & range_mask)
1460                             == (fcp_rscn_element->nport_did & range_mask)) {
1461                                 ZFCP_LOG_TRACE("reopen did 0x%08x\n",
1462                                                fcp_rscn_element->nport_did);
1463                                 /*
1464                                  * Unfortunately, an RSCN does not specify the
1465                                  * type of change a target underwent. We assume
1466                                  * that it makes sense to reopen the link.
1467                                  * FIXME: Shall we try to find out more about
1468                                  * the target and link state before closing it?
1469                                  * How to accomplish this? (nameserver?)
1470                                  * Where would such code be put in?
1471                                  * (inside or outside erp)
1472                                  */
1473                                 ZFCP_LOG_INFO("incoming RSCN, trying to open "
1474                                               "port 0x%016Lx\n", port->wwpn);
1475                                 zfcp_test_link(port);
1476                         }
1477                 }
1478                 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1479         }
1480 }
1481
1482 static void
1483 zfcp_fsf_incoming_els_plogi(struct zfcp_adapter *adapter,
1484                             struct fsf_status_read_buffer *status_buffer)
1485 {
1486         struct fsf_plogi *els_plogi;
1487         struct zfcp_port *port;
1488         unsigned long flags;
1489
1490         els_plogi = (struct fsf_plogi *) status_buffer->payload;
1491         read_lock_irqsave(&zfcp_data.config_lock, flags);
1492         list_for_each_entry(port, &adapter->port_list_head, list) {
1493                 if (port->wwpn == (*(wwn_t *) &els_plogi->serv_param.wwpn))
1494                         break;
1495         }
1496         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1497
1498         if (!port || (port->wwpn != (*(wwn_t *) &els_plogi->serv_param.wwpn))) {
1499                 ZFCP_LOG_DEBUG("ignored incoming PLOGI for nonexisting port "
1500                                "with d_id 0x%06x on adapter %s\n",
1501                                status_buffer->d_id,
1502                                zfcp_get_busid_by_adapter(adapter));
1503         } else {
1504                 zfcp_erp_port_forced_reopen(port, 0);
1505         }
1506 }
1507
1508 static void
1509 zfcp_fsf_incoming_els_logo(struct zfcp_adapter *adapter,
1510                            struct fsf_status_read_buffer *status_buffer)
1511 {
1512         struct fcp_logo *els_logo = (struct fcp_logo *) status_buffer->payload;
1513         struct zfcp_port *port;
1514         unsigned long flags;
1515
1516         read_lock_irqsave(&zfcp_data.config_lock, flags);
1517         list_for_each_entry(port, &adapter->port_list_head, list) {
1518                 if (port->wwpn == els_logo->nport_wwpn)
1519                         break;
1520         }
1521         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1522
1523         if (!port || (port->wwpn != els_logo->nport_wwpn)) {
1524                 ZFCP_LOG_DEBUG("ignored incoming LOGO for nonexisting port "
1525                                "with d_id 0x%06x on adapter %s\n",
1526                                status_buffer->d_id,
1527                                zfcp_get_busid_by_adapter(adapter));
1528         } else {
1529                 zfcp_erp_port_forced_reopen(port, 0);
1530         }
1531 }
1532
1533 static void
1534 zfcp_fsf_incoming_els_unknown(struct zfcp_adapter *adapter,
1535                               struct fsf_status_read_buffer *status_buffer)
1536 {
1537         ZFCP_LOG_NORMAL("warning: unknown incoming ELS 0x%08x "
1538                         "for adapter %s\n", *(u32 *) (status_buffer->payload),
1539                         zfcp_get_busid_by_adapter(adapter));
1540
1541 }
1542
1543 void
1544 zfcp_fsf_incoming_els(struct zfcp_fsf_req *fsf_req)
1545 {
1546         struct fsf_status_read_buffer *status_buffer;
1547         u32 els_type;
1548         struct zfcp_adapter *adapter;
1549
1550         status_buffer = (struct fsf_status_read_buffer *) fsf_req->data;
1551         els_type = *(u32 *) (status_buffer->payload);
1552         adapter = fsf_req->adapter;
1553
1554         zfcp_san_dbf_event_incoming_els(fsf_req);
1555         if (els_type == LS_PLOGI)
1556                 zfcp_fsf_incoming_els_plogi(adapter, status_buffer);
1557         else if (els_type == LS_LOGO)
1558                 zfcp_fsf_incoming_els_logo(adapter, status_buffer);
1559         else if ((els_type & 0xffff0000) == LS_RSCN)
1560                 /* we are only concerned with the command, not the length */
1561                 zfcp_fsf_incoming_els_rscn(adapter, status_buffer);
1562         else
1563                 zfcp_fsf_incoming_els_unknown(adapter, status_buffer);
1564 }
1565
1566
1567 /**
1568  * zfcp_gid_pn_buffers_alloc - allocate buffers for GID_PN nameserver request
1569  * @gid_pn: pointer to return pointer to struct zfcp_gid_pn_data
1570  * @pool: pointer to mempool_t if non-null memory pool is used for allocation
1571  */
1572 static int
1573 zfcp_gid_pn_buffers_alloc(struct zfcp_gid_pn_data **gid_pn, mempool_t *pool)
1574 {
1575         struct zfcp_gid_pn_data *data;
1576
1577         if (pool != NULL) {
1578                 data = mempool_alloc(pool, GFP_ATOMIC);
1579                 if (likely(data != NULL)) {
1580                         data->ct.pool = pool;
1581                 }
1582         } else {
1583                 data = kmalloc(sizeof(struct zfcp_gid_pn_data), GFP_ATOMIC);
1584         }
1585
1586         if (NULL == data)
1587                 return -ENOMEM;
1588
1589         memset(data, 0, sizeof(*data));
1590         data->ct.req = &data->req;
1591         data->ct.resp = &data->resp;
1592         data->ct.req_count = data->ct.resp_count = 1;
1593         zfcp_address_to_sg(&data->ct_iu_req, &data->req);
1594         zfcp_address_to_sg(&data->ct_iu_resp, &data->resp);
1595         data->req.length = sizeof(struct ct_iu_gid_pn_req);
1596         data->resp.length = sizeof(struct ct_iu_gid_pn_resp);
1597
1598         *gid_pn = data;
1599         return 0;
1600 }
1601
1602 /**
1603  * zfcp_gid_pn_buffers_free - free buffers for GID_PN nameserver request
1604  * @gid_pn: pointer to struct zfcp_gid_pn_data which has to be freed
1605  */
1606 static void
1607 zfcp_gid_pn_buffers_free(struct zfcp_gid_pn_data *gid_pn)
1608 {
1609         if ((gid_pn->ct.pool != 0))
1610                 mempool_free(gid_pn, gid_pn->ct.pool);
1611         else
1612                 kfree(gid_pn);
1613
1614         return;
1615 }
1616
1617 /**
1618  * zfcp_ns_gid_pn_request - initiate GID_PN nameserver request
1619  * @erp_action: pointer to zfcp_erp_action where GID_PN request is needed
1620  */
1621 int
1622 zfcp_ns_gid_pn_request(struct zfcp_erp_action *erp_action)
1623 {
1624         int ret;
1625         struct ct_iu_gid_pn_req *ct_iu_req;
1626         struct zfcp_gid_pn_data *gid_pn;
1627         struct zfcp_adapter *adapter = erp_action->adapter;
1628
1629         ret = zfcp_gid_pn_buffers_alloc(&gid_pn, adapter->pool.data_gid_pn);
1630         if (ret < 0) {
1631                 ZFCP_LOG_INFO("error: buffer allocation for gid_pn nameserver "
1632                               "request failed for adapter %s\n",
1633                               zfcp_get_busid_by_adapter(adapter));
1634                 goto out;
1635         }
1636
1637         /* setup nameserver request */
1638         ct_iu_req = zfcp_sg_to_address(gid_pn->ct.req);
1639         ct_iu_req->header.revision = ZFCP_CT_REVISION;
1640         ct_iu_req->header.gs_type = ZFCP_CT_DIRECTORY_SERVICE;
1641         ct_iu_req->header.gs_subtype = ZFCP_CT_NAME_SERVER;
1642         ct_iu_req->header.options = ZFCP_CT_SYNCHRONOUS;
1643         ct_iu_req->header.cmd_rsp_code = ZFCP_CT_GID_PN;
1644         ct_iu_req->header.max_res_size = ZFCP_CT_MAX_SIZE;
1645         ct_iu_req->wwpn = erp_action->port->wwpn;
1646
1647         /* setup parameters for send generic command */
1648         gid_pn->ct.port = adapter->nameserver_port;
1649         gid_pn->ct.handler = zfcp_ns_gid_pn_handler;
1650         gid_pn->ct.handler_data = (unsigned long) gid_pn;
1651         gid_pn->ct.timeout = ZFCP_NS_GID_PN_TIMEOUT;
1652         gid_pn->port = erp_action->port;
1653
1654         ret = zfcp_fsf_send_ct(&gid_pn->ct, adapter->pool.fsf_req_erp,
1655                                erp_action);
1656         if (ret) {
1657                 ZFCP_LOG_INFO("error: initiation of gid_pn nameserver request "
1658                               "failed for adapter %s\n",
1659                               zfcp_get_busid_by_adapter(adapter));
1660
1661                 zfcp_gid_pn_buffers_free(gid_pn);
1662         }
1663
1664  out:
1665         return ret;
1666 }
1667
1668 /**
1669  * zfcp_ns_gid_pn_handler - handler for GID_PN nameserver request
1670  * @data: unsigned long, contains pointer to struct zfcp_gid_pn_data
1671  */
1672 static void zfcp_ns_gid_pn_handler(unsigned long data)
1673 {
1674         struct zfcp_port *port;
1675         struct zfcp_send_ct *ct;
1676         struct ct_iu_gid_pn_req *ct_iu_req;
1677         struct ct_iu_gid_pn_resp *ct_iu_resp;
1678         struct zfcp_gid_pn_data *gid_pn;
1679
1680
1681         gid_pn = (struct zfcp_gid_pn_data *) data;
1682         port = gid_pn->port;
1683         ct = &gid_pn->ct;
1684         ct_iu_req = zfcp_sg_to_address(ct->req);
1685         ct_iu_resp = zfcp_sg_to_address(ct->resp);
1686
1687         if (ct->status != 0)
1688                 goto failed;
1689
1690         if (zfcp_check_ct_response(&ct_iu_resp->header)) {
1691                 /* FIXME: do we need some specific erp entry points */
1692                 atomic_set_mask(ZFCP_STATUS_PORT_INVALID_WWPN, &port->status);
1693                 goto failed;
1694         }
1695         /* paranoia */
1696         if (ct_iu_req->wwpn != port->wwpn) {
1697                 ZFCP_LOG_NORMAL("bug: wwpn 0x%016Lx returned by nameserver "
1698                                 "lookup does not match expected wwpn 0x%016Lx "
1699                                 "for adapter %s\n", ct_iu_req->wwpn, port->wwpn,
1700                                 zfcp_get_busid_by_port(port));
1701                 goto mismatch;
1702         }
1703
1704         /* looks like a valid d_id */
1705         port->d_id = ct_iu_resp->d_id & ZFCP_DID_MASK;
1706         atomic_set_mask(ZFCP_STATUS_PORT_DID_DID, &port->status);
1707         ZFCP_LOG_DEBUG("adapter %s:  wwpn=0x%016Lx ---> d_id=0x%06x\n",
1708                        zfcp_get_busid_by_port(port), port->wwpn, port->d_id);
1709         goto out;
1710
1711  mismatch:
1712         ZFCP_LOG_DEBUG("CT IUs do not match:\n");
1713         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_req,
1714                       sizeof(struct ct_iu_gid_pn_req));
1715         ZFCP_HEX_DUMP(ZFCP_LOG_LEVEL_DEBUG, (char *) ct_iu_resp,
1716                       sizeof(struct ct_iu_gid_pn_resp));
1717
1718  failed:
1719         ZFCP_LOG_NORMAL("warning: failed gid_pn nameserver request for wwpn "
1720                         "0x%016Lx for adapter %s\n",
1721                         port->wwpn, zfcp_get_busid_by_port(port));
1722  out:
1723         zfcp_gid_pn_buffers_free(gid_pn);
1724         return;
1725 }
1726
1727 /* reject CT_IU reason codes acc. to FC-GS-4 */
1728 static const struct zfcp_rc_entry zfcp_ct_rc[] = {
1729         {0x01, "invalid command code"},
1730         {0x02, "invalid version level"},
1731         {0x03, "logical error"},
1732         {0x04, "invalid CT_IU size"},
1733         {0x05, "logical busy"},
1734         {0x07, "protocol error"},
1735         {0x09, "unable to perform command request"},
1736         {0x0b, "command not supported"},
1737         {0x0d, "server not available"},
1738         {0x0e, "session could not be established"},
1739         {0xff, "vendor specific error"},
1740         {0, NULL},
1741 };
1742
1743 /* LS_RJT reason codes acc. to FC-FS */
1744 static const struct zfcp_rc_entry zfcp_ls_rjt_rc[] = {
1745         {0x01, "invalid LS_Command code"},
1746         {0x03, "logical error"},
1747         {0x05, "logical busy"},
1748         {0x07, "protocol error"},
1749         {0x09, "unable to perform command request"},
1750         {0x0b, "command not supported"},
1751         {0x0e, "command already in progress"},
1752         {0xff, "vendor specific error"},
1753         {0, NULL},
1754 };
1755
1756 /* reject reason codes according to FC-PH/FC-FS */
1757 static const struct zfcp_rc_entry zfcp_p_rjt_rc[] = {
1758         {0x01, "invalid D_ID"},
1759         {0x02, "invalid S_ID"},
1760         {0x03, "Nx_Port not available, temporary"},
1761         {0x04, "Nx_Port not available, permament"},
1762         {0x05, "class not supported"},
1763         {0x06, "delimiter usage error"},
1764         {0x07, "TYPE not supported"},
1765         {0x08, "invalid Link_Control"},
1766         {0x09, "invalid R_CTL field"},
1767         {0x0a, "invalid F_CTL field"},
1768         {0x0b, "invalid OX_ID"},
1769         {0x0c, "invalid RX_ID"},
1770         {0x0d, "invalid SEQ_ID"},
1771         {0x0e, "invalid DF_CTL"},
1772         {0x0f, "invalid SEQ_CNT"},
1773         {0x10, "invalid parameter field"},
1774         {0x11, "exchange error"},
1775         {0x12, "protocol error"},
1776         {0x13, "incorrect length"},
1777         {0x14, "unsupported ACK"},
1778         {0x15, "class of service not supported by entity at FFFFFE"},
1779         {0x16, "login required"},
1780         {0x17, "excessive sequences attempted"},
1781         {0x18, "unable to establish exchange"},
1782         {0x1a, "fabric path not available"},
1783         {0x1b, "invalid VC_ID (class 4)"},
1784         {0x1c, "invalid CS_CTL field"},
1785         {0x1d, "insufficient resources for VC (class 4)"},
1786         {0x1f, "invalid class of service"},
1787         {0x20, "preemption request rejected"},
1788         {0x21, "preemption not enabled"},
1789         {0x22, "multicast error"},
1790         {0x23, "multicast error terminate"},
1791         {0x24, "process login required"},
1792         {0xff, "vendor specific reject"},
1793         {0, NULL},
1794 };
1795
1796 /**
1797  * zfcp_rc_description - return description for given reaon code
1798  * @code: reason code
1799  * @rc_table: table of reason codes and descriptions
1800  */
1801 static const char *
1802 zfcp_rc_description(u8 code, const struct zfcp_rc_entry *rc_table)
1803 {
1804         const char *descr = "unknown reason code";
1805
1806         do {
1807                 if (code == rc_table->code) {
1808                         descr = rc_table->description;
1809                         break;
1810                 }
1811                 rc_table++;
1812         } while (rc_table->code && rc_table->description);
1813
1814         return descr;
1815 }
1816
1817 /**
1818  * zfcp_check_ct_response - evaluate reason code for CT_IU
1819  * @rjt: response payload to an CT_IU request
1820  * Return: 0 for accept CT_IU, 1 for reject CT_IU or invlid response code
1821  */
1822 int
1823 zfcp_check_ct_response(struct ct_hdr *rjt)
1824 {
1825         if (rjt->cmd_rsp_code == ZFCP_CT_ACCEPT)
1826                 return 0;
1827
1828         if (rjt->cmd_rsp_code != ZFCP_CT_REJECT) {
1829                 ZFCP_LOG_NORMAL("error: invalid Generic Service command/"
1830                                 "response code (0x%04hx)\n",
1831                                 rjt->cmd_rsp_code);
1832                 return 1;
1833         }
1834
1835         ZFCP_LOG_INFO("Generic Service command rejected\n");
1836         ZFCP_LOG_INFO("%s (0x%02x, 0x%02x, 0x%02x)\n",
1837                       zfcp_rc_description(rjt->reason_code, zfcp_ct_rc),
1838                       (u32) rjt->reason_code, (u32) rjt->reason_code_expl,
1839                       (u32) rjt->vendor_unique);
1840
1841         return 1;
1842 }
1843
1844 /**
1845  * zfcp_print_els_rjt - print reject parameter and description for ELS reject
1846  * @rjt_par: reject parameter acc. to FC-PH/FC-FS
1847  * @rc_table: table of reason codes and descriptions
1848  */
1849 static void
1850 zfcp_print_els_rjt(struct zfcp_ls_rjt_par *rjt_par,
1851                    const struct zfcp_rc_entry *rc_table)
1852 {
1853         ZFCP_LOG_INFO("%s (%02x %02x %02x %02x)\n",
1854                       zfcp_rc_description(rjt_par->reason_code, rc_table),
1855                       (u32) rjt_par->action, (u32) rjt_par->reason_code,
1856                       (u32) rjt_par->reason_expl, (u32) rjt_par->vendor_unique);
1857 }
1858
1859 /**
1860  * zfcp_fsf_handle_els_rjt - evaluate status qualifier/reason code on ELS reject
1861  * @sq: status qualifier word
1862  * @rjt_par: reject parameter as described in FC-PH and FC-FS
1863  * Return: -EROMTEIO for LS_RJT, -EREMCHG for invalid D_ID, -EIO else
1864  */
1865 int
1866 zfcp_handle_els_rjt(u32 sq, struct zfcp_ls_rjt_par *rjt_par)
1867 {
1868         int ret = -EIO;
1869
1870         if (sq == FSF_IOSTAT_NPORT_RJT) {
1871                 ZFCP_LOG_INFO("ELS rejected (P_RJT)\n");
1872                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1873                 /* invalid d_id */
1874                 if (rjt_par->reason_code == 0x01)
1875                         ret = -EREMCHG;
1876         } else if (sq == FSF_IOSTAT_FABRIC_RJT) {
1877                 ZFCP_LOG_INFO("ELS rejected (F_RJT)\n");
1878                 zfcp_print_els_rjt(rjt_par, zfcp_p_rjt_rc);
1879                 /* invalid d_id */
1880                 if (rjt_par->reason_code == 0x01)
1881                         ret = -EREMCHG;
1882         } else if (sq == FSF_IOSTAT_LS_RJT) {
1883                 ZFCP_LOG_INFO("ELS rejected (LS_RJT)\n");
1884                 zfcp_print_els_rjt(rjt_par, zfcp_ls_rjt_rc);
1885                 ret = -EREMOTEIO;
1886         } else
1887                 ZFCP_LOG_INFO("unexpected SQ: 0x%02x\n", sq);
1888
1889         return ret;
1890 }
1891
1892 /**
1893  * zfcp_plogi_evaluate - evaluate PLOGI playload and copy important fields
1894  * into zfcp_port structure
1895  * @port: zfcp_port structure
1896  * @plogi: plogi payload
1897  */
1898 void
1899 zfcp_plogi_evaluate(struct zfcp_port *port, struct fsf_plogi *plogi)
1900 {
1901         port->maxframe_size = plogi->serv_param.common_serv_param[7] |
1902                 ((plogi->serv_param.common_serv_param[6] & 0x0F) << 8);
1903         if (plogi->serv_param.class1_serv_param[0] & 0x80)
1904                 port->supported_classes |= FC_COS_CLASS1;
1905         if (plogi->serv_param.class2_serv_param[0] & 0x80)
1906                 port->supported_classes |= FC_COS_CLASS2;
1907         if (plogi->serv_param.class3_serv_param[0] & 0x80)
1908                 port->supported_classes |= FC_COS_CLASS3;
1909         if (plogi->serv_param.class4_serv_param[0] & 0x80)
1910                 port->supported_classes |= FC_COS_CLASS4;
1911 }
1912
1913 #undef ZFCP_LOG_AREA