/drivers/scsi/ibmvscsi/ibmvfc.c
C | 4976 lines | 3450 code | 564 blank | 962 comment | 501 complexity | ad5922a1a8e04238825d56a83cc050d6 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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1/*
2 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
3 *
4 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
5 *
6 * Copyright (C) IBM Corporation, 2008
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/dma-mapping.h>
27#include <linux/dmapool.h>
28#include <linux/delay.h>
29#include <linux/interrupt.h>
30#include <linux/kthread.h>
31#include <linux/slab.h>
32#include <linux/of.h>
33#include <linux/pm.h>
34#include <linux/stringify.h>
35#include <asm/firmware.h>
36#include <asm/irq.h>
37#include <asm/vio.h>
38#include <scsi/scsi.h>
39#include <scsi/scsi_cmnd.h>
40#include <scsi/scsi_host.h>
41#include <scsi/scsi_device.h>
42#include <scsi/scsi_tcq.h>
43#include <scsi/scsi_transport_fc.h>
44#include <scsi/scsi_bsg_fc.h>
45#include "ibmvfc.h"
46
47static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
48static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
49static unsigned int max_lun = IBMVFC_MAX_LUN;
50static unsigned int max_targets = IBMVFC_MAX_TARGETS;
51static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
52static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
53static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
54static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
55static LIST_HEAD(ibmvfc_head);
56static DEFINE_SPINLOCK(ibmvfc_driver_lock);
57static struct scsi_transport_template *ibmvfc_transport_template;
58
59MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
60MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
61MODULE_LICENSE("GPL");
62MODULE_VERSION(IBMVFC_DRIVER_VERSION);
63
64module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
65MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
66 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
67module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
68MODULE_PARM_DESC(default_timeout,
69 "Default timeout in seconds for initialization and EH commands. "
70 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
71module_param_named(max_requests, max_requests, uint, S_IRUGO);
72MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
73 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
74module_param_named(max_lun, max_lun, uint, S_IRUGO);
75MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
76 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
77module_param_named(max_targets, max_targets, uint, S_IRUGO);
78MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
79 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
80module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
81MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
82 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
83module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
84MODULE_PARM_DESC(debug, "Enable driver debug information. "
85 "[Default=" __stringify(IBMVFC_DEBUG) "]");
86module_param_named(log_level, log_level, uint, 0);
87MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
88 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
89
90static const struct {
91 u16 status;
92 u16 error;
93 u8 result;
94 u8 retry;
95 int log;
96 char *name;
97} cmd_status [] = {
98 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
99 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
100 { IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
101 { IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
102 { IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
103 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
104 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
105 { IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
106 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
107 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
108 { IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
109 { IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
110 { IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
111 { IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
112
113 { IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
114 { IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
115 { IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
116 { IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
117 { IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
118 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
119 { IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
120 { IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
121 { IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
122 { IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
123
124 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
125 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
126 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
127 { IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
128 { IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
129 { IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
130 { IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
131 { IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
132 { IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
133 { IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
134 { IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
135
136 { IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
137};
138
139static void ibmvfc_npiv_login(struct ibmvfc_host *);
140static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
141static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
142static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
143static void ibmvfc_npiv_logout(struct ibmvfc_host *);
144
145static const char *unknown_error = "unknown error";
146
147#ifdef CONFIG_SCSI_IBMVFC_TRACE
148/**
149 * ibmvfc_trc_start - Log a start trace entry
150 * @evt: ibmvfc event struct
151 *
152 **/
153static void ibmvfc_trc_start(struct ibmvfc_event *evt)
154{
155 struct ibmvfc_host *vhost = evt->vhost;
156 struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
157 struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
158 struct ibmvfc_trace_entry *entry;
159
160 entry = &vhost->trace[vhost->trace_index++];
161 entry->evt = evt;
162 entry->time = jiffies;
163 entry->fmt = evt->crq.format;
164 entry->type = IBMVFC_TRC_START;
165
166 switch (entry->fmt) {
167 case IBMVFC_CMD_FORMAT:
168 entry->op_code = vfc_cmd->iu.cdb[0];
169 entry->scsi_id = vfc_cmd->tgt_scsi_id;
170 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
171 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
172 entry->u.start.xfer_len = vfc_cmd->iu.xfer_len;
173 break;
174 case IBMVFC_MAD_FORMAT:
175 entry->op_code = mad->opcode;
176 break;
177 default:
178 break;
179 };
180}
181
182/**
183 * ibmvfc_trc_end - Log an end trace entry
184 * @evt: ibmvfc event struct
185 *
186 **/
187static void ibmvfc_trc_end(struct ibmvfc_event *evt)
188{
189 struct ibmvfc_host *vhost = evt->vhost;
190 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
191 struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
192 struct ibmvfc_trace_entry *entry = &vhost->trace[vhost->trace_index++];
193
194 entry->evt = evt;
195 entry->time = jiffies;
196 entry->fmt = evt->crq.format;
197 entry->type = IBMVFC_TRC_END;
198
199 switch (entry->fmt) {
200 case IBMVFC_CMD_FORMAT:
201 entry->op_code = vfc_cmd->iu.cdb[0];
202 entry->scsi_id = vfc_cmd->tgt_scsi_id;
203 entry->lun = scsilun_to_int(&vfc_cmd->iu.lun);
204 entry->tmf_flags = vfc_cmd->iu.tmf_flags;
205 entry->u.end.status = vfc_cmd->status;
206 entry->u.end.error = vfc_cmd->error;
207 entry->u.end.fcp_rsp_flags = vfc_cmd->rsp.flags;
208 entry->u.end.rsp_code = vfc_cmd->rsp.data.info.rsp_code;
209 entry->u.end.scsi_status = vfc_cmd->rsp.scsi_status;
210 break;
211 case IBMVFC_MAD_FORMAT:
212 entry->op_code = mad->opcode;
213 entry->u.end.status = mad->status;
214 break;
215 default:
216 break;
217
218 };
219}
220
221#else
222#define ibmvfc_trc_start(evt) do { } while (0)
223#define ibmvfc_trc_end(evt) do { } while (0)
224#endif
225
226/**
227 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
228 * @status: status / error class
229 * @error: error
230 *
231 * Return value:
232 * index into cmd_status / -EINVAL on failure
233 **/
234static int ibmvfc_get_err_index(u16 status, u16 error)
235{
236 int i;
237
238 for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
239 if ((cmd_status[i].status & status) == cmd_status[i].status &&
240 cmd_status[i].error == error)
241 return i;
242
243 return -EINVAL;
244}
245
246/**
247 * ibmvfc_get_cmd_error - Find the error description for the fcp response
248 * @status: status / error class
249 * @error: error
250 *
251 * Return value:
252 * error description string
253 **/
254static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
255{
256 int rc = ibmvfc_get_err_index(status, error);
257 if (rc >= 0)
258 return cmd_status[rc].name;
259 return unknown_error;
260}
261
262/**
263 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
264 * @vfc_cmd: ibmvfc command struct
265 *
266 * Return value:
267 * SCSI result value to return for completed command
268 **/
269static int ibmvfc_get_err_result(struct ibmvfc_cmd *vfc_cmd)
270{
271 int err;
272 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
273 int fc_rsp_len = rsp->fcp_rsp_len;
274
275 if ((rsp->flags & FCP_RSP_LEN_VALID) &&
276 ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
277 rsp->data.info.rsp_code))
278 return DID_ERROR << 16;
279
280 err = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
281 if (err >= 0)
282 return rsp->scsi_status | (cmd_status[err].result << 16);
283 return rsp->scsi_status | (DID_ERROR << 16);
284}
285
286/**
287 * ibmvfc_retry_cmd - Determine if error status is retryable
288 * @status: status / error class
289 * @error: error
290 *
291 * Return value:
292 * 1 if error should be retried / 0 if it should not
293 **/
294static int ibmvfc_retry_cmd(u16 status, u16 error)
295{
296 int rc = ibmvfc_get_err_index(status, error);
297
298 if (rc >= 0)
299 return cmd_status[rc].retry;
300 return 1;
301}
302
303static const char *unknown_fc_explain = "unknown fc explain";
304
305static const struct {
306 u16 fc_explain;
307 char *name;
308} ls_explain [] = {
309 { 0x00, "no additional explanation" },
310 { 0x01, "service parameter error - options" },
311 { 0x03, "service parameter error - initiator control" },
312 { 0x05, "service parameter error - recipient control" },
313 { 0x07, "service parameter error - received data field size" },
314 { 0x09, "service parameter error - concurrent seq" },
315 { 0x0B, "service parameter error - credit" },
316 { 0x0D, "invalid N_Port/F_Port_Name" },
317 { 0x0E, "invalid node/Fabric Name" },
318 { 0x0F, "invalid common service parameters" },
319 { 0x11, "invalid association header" },
320 { 0x13, "association header required" },
321 { 0x15, "invalid originator S_ID" },
322 { 0x17, "invalid OX_ID-RX-ID combination" },
323 { 0x19, "command (request) already in progress" },
324 { 0x1E, "N_Port Login requested" },
325 { 0x1F, "Invalid N_Port_ID" },
326};
327
328static const struct {
329 u16 fc_explain;
330 char *name;
331} gs_explain [] = {
332 { 0x00, "no additional explanation" },
333 { 0x01, "port identifier not registered" },
334 { 0x02, "port name not registered" },
335 { 0x03, "node name not registered" },
336 { 0x04, "class of service not registered" },
337 { 0x06, "initial process associator not registered" },
338 { 0x07, "FC-4 TYPEs not registered" },
339 { 0x08, "symbolic port name not registered" },
340 { 0x09, "symbolic node name not registered" },
341 { 0x0A, "port type not registered" },
342 { 0xF0, "authorization exception" },
343 { 0xF1, "authentication exception" },
344 { 0xF2, "data base full" },
345 { 0xF3, "data base empty" },
346 { 0xF4, "processing request" },
347 { 0xF5, "unable to verify connection" },
348 { 0xF6, "devices not in a common zone" },
349};
350
351/**
352 * ibmvfc_get_ls_explain - Return the FC Explain description text
353 * @status: FC Explain status
354 *
355 * Returns:
356 * error string
357 **/
358static const char *ibmvfc_get_ls_explain(u16 status)
359{
360 int i;
361
362 for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
363 if (ls_explain[i].fc_explain == status)
364 return ls_explain[i].name;
365
366 return unknown_fc_explain;
367}
368
369/**
370 * ibmvfc_get_gs_explain - Return the FC Explain description text
371 * @status: FC Explain status
372 *
373 * Returns:
374 * error string
375 **/
376static const char *ibmvfc_get_gs_explain(u16 status)
377{
378 int i;
379
380 for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
381 if (gs_explain[i].fc_explain == status)
382 return gs_explain[i].name;
383
384 return unknown_fc_explain;
385}
386
387static const struct {
388 enum ibmvfc_fc_type fc_type;
389 char *name;
390} fc_type [] = {
391 { IBMVFC_FABRIC_REJECT, "fabric reject" },
392 { IBMVFC_PORT_REJECT, "port reject" },
393 { IBMVFC_LS_REJECT, "ELS reject" },
394 { IBMVFC_FABRIC_BUSY, "fabric busy" },
395 { IBMVFC_PORT_BUSY, "port busy" },
396 { IBMVFC_BASIC_REJECT, "basic reject" },
397};
398
399static const char *unknown_fc_type = "unknown fc type";
400
401/**
402 * ibmvfc_get_fc_type - Return the FC Type description text
403 * @status: FC Type error status
404 *
405 * Returns:
406 * error string
407 **/
408static const char *ibmvfc_get_fc_type(u16 status)
409{
410 int i;
411
412 for (i = 0; i < ARRAY_SIZE(fc_type); i++)
413 if (fc_type[i].fc_type == status)
414 return fc_type[i].name;
415
416 return unknown_fc_type;
417}
418
419/**
420 * ibmvfc_set_tgt_action - Set the next init action for the target
421 * @tgt: ibmvfc target struct
422 * @action: action to perform
423 *
424 **/
425static void ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
426 enum ibmvfc_target_action action)
427{
428 switch (tgt->action) {
429 case IBMVFC_TGT_ACTION_DEL_RPORT:
430 if (action == IBMVFC_TGT_ACTION_DELETED_RPORT)
431 tgt->action = action;
432 case IBMVFC_TGT_ACTION_DELETED_RPORT:
433 break;
434 default:
435 if (action == IBMVFC_TGT_ACTION_DEL_RPORT)
436 tgt->add_rport = 0;
437 tgt->action = action;
438 break;
439 }
440}
441
442/**
443 * ibmvfc_set_host_state - Set the state for the host
444 * @vhost: ibmvfc host struct
445 * @state: state to set host to
446 *
447 * Returns:
448 * 0 if state changed / non-zero if not changed
449 **/
450static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
451 enum ibmvfc_host_state state)
452{
453 int rc = 0;
454
455 switch (vhost->state) {
456 case IBMVFC_HOST_OFFLINE:
457 rc = -EINVAL;
458 break;
459 default:
460 vhost->state = state;
461 break;
462 };
463
464 return rc;
465}
466
467/**
468 * ibmvfc_set_host_action - Set the next init action for the host
469 * @vhost: ibmvfc host struct
470 * @action: action to perform
471 *
472 **/
473static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
474 enum ibmvfc_host_action action)
475{
476 switch (action) {
477 case IBMVFC_HOST_ACTION_ALLOC_TGTS:
478 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
479 vhost->action = action;
480 break;
481 case IBMVFC_HOST_ACTION_LOGO_WAIT:
482 if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
483 vhost->action = action;
484 break;
485 case IBMVFC_HOST_ACTION_INIT_WAIT:
486 if (vhost->action == IBMVFC_HOST_ACTION_INIT)
487 vhost->action = action;
488 break;
489 case IBMVFC_HOST_ACTION_QUERY:
490 switch (vhost->action) {
491 case IBMVFC_HOST_ACTION_INIT_WAIT:
492 case IBMVFC_HOST_ACTION_NONE:
493 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
494 vhost->action = action;
495 break;
496 default:
497 break;
498 };
499 break;
500 case IBMVFC_HOST_ACTION_TGT_INIT:
501 if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
502 vhost->action = action;
503 break;
504 case IBMVFC_HOST_ACTION_INIT:
505 case IBMVFC_HOST_ACTION_TGT_DEL:
506 switch (vhost->action) {
507 case IBMVFC_HOST_ACTION_RESET:
508 case IBMVFC_HOST_ACTION_REENABLE:
509 break;
510 default:
511 vhost->action = action;
512 break;
513 };
514 break;
515 case IBMVFC_HOST_ACTION_LOGO:
516 case IBMVFC_HOST_ACTION_QUERY_TGTS:
517 case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
518 case IBMVFC_HOST_ACTION_NONE:
519 case IBMVFC_HOST_ACTION_RESET:
520 case IBMVFC_HOST_ACTION_REENABLE:
521 default:
522 vhost->action = action;
523 break;
524 };
525}
526
527/**
528 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
529 * @vhost: ibmvfc host struct
530 *
531 * Return value:
532 * nothing
533 **/
534static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
535{
536 if (vhost->action == IBMVFC_HOST_ACTION_NONE) {
537 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
538 scsi_block_requests(vhost->host);
539 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
540 }
541 } else
542 vhost->reinit = 1;
543
544 wake_up(&vhost->work_wait_q);
545}
546
547/**
548 * ibmvfc_link_down - Handle a link down event from the adapter
549 * @vhost: ibmvfc host struct
550 * @state: ibmvfc host state to enter
551 *
552 **/
553static void ibmvfc_link_down(struct ibmvfc_host *vhost,
554 enum ibmvfc_host_state state)
555{
556 struct ibmvfc_target *tgt;
557
558 ENTER;
559 scsi_block_requests(vhost->host);
560 list_for_each_entry(tgt, &vhost->targets, queue)
561 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
562 ibmvfc_set_host_state(vhost, state);
563 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
564 vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
565 wake_up(&vhost->work_wait_q);
566 LEAVE;
567}
568
569/**
570 * ibmvfc_init_host - Start host initialization
571 * @vhost: ibmvfc host struct
572 *
573 * Return value:
574 * nothing
575 **/
576static void ibmvfc_init_host(struct ibmvfc_host *vhost)
577{
578 struct ibmvfc_target *tgt;
579
580 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
581 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
582 dev_err(vhost->dev,
583 "Host initialization retries exceeded. Taking adapter offline\n");
584 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
585 return;
586 }
587 }
588
589 if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
590 memset(vhost->async_crq.msgs, 0, PAGE_SIZE);
591 vhost->async_crq.cur = 0;
592
593 list_for_each_entry(tgt, &vhost->targets, queue)
594 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
595 scsi_block_requests(vhost->host);
596 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
597 vhost->job_step = ibmvfc_npiv_login;
598 wake_up(&vhost->work_wait_q);
599 }
600}
601
602/**
603 * ibmvfc_send_crq - Send a CRQ
604 * @vhost: ibmvfc host struct
605 * @word1: the first 64 bits of the data
606 * @word2: the second 64 bits of the data
607 *
608 * Return value:
609 * 0 on success / other on failure
610 **/
611static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
612{
613 struct vio_dev *vdev = to_vio_dev(vhost->dev);
614 return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
615}
616
617/**
618 * ibmvfc_send_crq_init - Send a CRQ init message
619 * @vhost: ibmvfc host struct
620 *
621 * Return value:
622 * 0 on success / other on failure
623 **/
624static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
625{
626 ibmvfc_dbg(vhost, "Sending CRQ init\n");
627 return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
628}
629
630/**
631 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
632 * @vhost: ibmvfc host struct
633 *
634 * Return value:
635 * 0 on success / other on failure
636 **/
637static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
638{
639 ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
640 return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
641}
642
643/**
644 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
645 * @vhost: ibmvfc host struct
646 *
647 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
648 * the crq with the hypervisor.
649 **/
650static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
651{
652 long rc = 0;
653 struct vio_dev *vdev = to_vio_dev(vhost->dev);
654 struct ibmvfc_crq_queue *crq = &vhost->crq;
655
656 ibmvfc_dbg(vhost, "Releasing CRQ\n");
657 free_irq(vdev->irq, vhost);
658 tasklet_kill(&vhost->tasklet);
659 do {
660 if (rc)
661 msleep(100);
662 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
663 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
664
665 vhost->state = IBMVFC_NO_CRQ;
666 vhost->logged_in = 0;
667 dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
668 free_page((unsigned long)crq->msgs);
669}
670
671/**
672 * ibmvfc_reenable_crq_queue - reenables the CRQ
673 * @vhost: ibmvfc host struct
674 *
675 * Return value:
676 * 0 on success / other on failure
677 **/
678static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
679{
680 int rc = 0;
681 struct vio_dev *vdev = to_vio_dev(vhost->dev);
682
683 /* Re-enable the CRQ */
684 do {
685 if (rc)
686 msleep(100);
687 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
688 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
689
690 if (rc)
691 dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
692
693 return rc;
694}
695
696/**
697 * ibmvfc_reset_crq - resets a crq after a failure
698 * @vhost: ibmvfc host struct
699 *
700 * Return value:
701 * 0 on success / other on failure
702 **/
703static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
704{
705 int rc = 0;
706 unsigned long flags;
707 struct vio_dev *vdev = to_vio_dev(vhost->dev);
708 struct ibmvfc_crq_queue *crq = &vhost->crq;
709
710 /* Close the CRQ */
711 do {
712 if (rc)
713 msleep(100);
714 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
715 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
716
717 spin_lock_irqsave(vhost->host->host_lock, flags);
718 vhost->state = IBMVFC_NO_CRQ;
719 vhost->logged_in = 0;
720 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
721
722 /* Clean out the queue */
723 memset(crq->msgs, 0, PAGE_SIZE);
724 crq->cur = 0;
725
726 /* And re-open it again */
727 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
728 crq->msg_token, PAGE_SIZE);
729
730 if (rc == H_CLOSED)
731 /* Adapter is good, but other end is not ready */
732 dev_warn(vhost->dev, "Partner adapter not ready\n");
733 else if (rc != 0)
734 dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
735 spin_unlock_irqrestore(vhost->host->host_lock, flags);
736
737 return rc;
738}
739
740/**
741 * ibmvfc_valid_event - Determines if event is valid.
742 * @pool: event_pool that contains the event
743 * @evt: ibmvfc event to be checked for validity
744 *
745 * Return value:
746 * 1 if event is valid / 0 if event is not valid
747 **/
748static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
749 struct ibmvfc_event *evt)
750{
751 int index = evt - pool->events;
752 if (index < 0 || index >= pool->size) /* outside of bounds */
753 return 0;
754 if (evt != pool->events + index) /* unaligned */
755 return 0;
756 return 1;
757}
758
759/**
760 * ibmvfc_free_event - Free the specified event
761 * @evt: ibmvfc_event to be freed
762 *
763 **/
764static void ibmvfc_free_event(struct ibmvfc_event *evt)
765{
766 struct ibmvfc_host *vhost = evt->vhost;
767 struct ibmvfc_event_pool *pool = &vhost->pool;
768
769 BUG_ON(!ibmvfc_valid_event(pool, evt));
770 BUG_ON(atomic_inc_return(&evt->free) != 1);
771 list_add_tail(&evt->queue, &vhost->free);
772}
773
774/**
775 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
776 * @evt: ibmvfc event struct
777 *
778 * This function does not setup any error status, that must be done
779 * before this function gets called.
780 **/
781static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
782{
783 struct scsi_cmnd *cmnd = evt->cmnd;
784
785 if (cmnd) {
786 scsi_dma_unmap(cmnd);
787 cmnd->scsi_done(cmnd);
788 }
789
790 if (evt->eh_comp)
791 complete(evt->eh_comp);
792
793 ibmvfc_free_event(evt);
794}
795
796/**
797 * ibmvfc_fail_request - Fail request with specified error code
798 * @evt: ibmvfc event struct
799 * @error_code: error code to fail request with
800 *
801 * Return value:
802 * none
803 **/
804static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
805{
806 if (evt->cmnd) {
807 evt->cmnd->result = (error_code << 16);
808 evt->done = ibmvfc_scsi_eh_done;
809 } else
810 evt->xfer_iu->mad_common.status = IBMVFC_MAD_DRIVER_FAILED;
811
812 list_del(&evt->queue);
813 del_timer(&evt->timer);
814 ibmvfc_trc_end(evt);
815 evt->done(evt);
816}
817
818/**
819 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
820 * @vhost: ibmvfc host struct
821 * @error_code: error code to fail requests with
822 *
823 * Return value:
824 * none
825 **/
826static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
827{
828 struct ibmvfc_event *evt, *pos;
829
830 ibmvfc_dbg(vhost, "Purging all requests\n");
831 list_for_each_entry_safe(evt, pos, &vhost->sent, queue)
832 ibmvfc_fail_request(evt, error_code);
833}
834
835/**
836 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
837 * @vhost: struct ibmvfc host to reset
838 **/
839static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
840{
841 ibmvfc_purge_requests(vhost, DID_ERROR);
842 ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
843 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
844}
845
846/**
847 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
848 * @vhost: struct ibmvfc host to reset
849 **/
850static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
851{
852 if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
853 !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
854 scsi_block_requests(vhost->host);
855 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
856 vhost->job_step = ibmvfc_npiv_logout;
857 wake_up(&vhost->work_wait_q);
858 } else
859 ibmvfc_hard_reset_host(vhost);
860}
861
862/**
863 * ibmvfc_reset_host - Reset the connection to the server
864 * @vhost: ibmvfc host struct
865 **/
866static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
867{
868 unsigned long flags;
869
870 spin_lock_irqsave(vhost->host->host_lock, flags);
871 __ibmvfc_reset_host(vhost);
872 spin_unlock_irqrestore(vhost->host->host_lock, flags);
873}
874
875/**
876 * ibmvfc_retry_host_init - Retry host initialization if allowed
877 * @vhost: ibmvfc host struct
878 *
879 * Returns: 1 if init will be retried / 0 if not
880 *
881 **/
882static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
883{
884 int retry = 0;
885
886 if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
887 vhost->delay_init = 1;
888 if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
889 dev_err(vhost->dev,
890 "Host initialization retries exceeded. Taking adapter offline\n");
891 ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
892 } else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
893 __ibmvfc_reset_host(vhost);
894 else {
895 ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
896 retry = 1;
897 }
898 }
899
900 wake_up(&vhost->work_wait_q);
901 return retry;
902}
903
904/**
905 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
906 * @starget: scsi target struct
907 *
908 * Return value:
909 * ibmvfc_target struct / NULL if not found
910 **/
911static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
912{
913 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
914 struct ibmvfc_host *vhost = shost_priv(shost);
915 struct ibmvfc_target *tgt;
916
917 list_for_each_entry(tgt, &vhost->targets, queue)
918 if (tgt->target_id == starget->id) {
919 kref_get(&tgt->kref);
920 return tgt;
921 }
922 return NULL;
923}
924
925/**
926 * ibmvfc_get_target - Find the specified scsi_target
927 * @starget: scsi target struct
928 *
929 * Return value:
930 * ibmvfc_target struct / NULL if not found
931 **/
932static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
933{
934 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
935 struct ibmvfc_target *tgt;
936 unsigned long flags;
937
938 spin_lock_irqsave(shost->host_lock, flags);
939 tgt = __ibmvfc_get_target(starget);
940 spin_unlock_irqrestore(shost->host_lock, flags);
941 return tgt;
942}
943
944/**
945 * ibmvfc_get_host_speed - Get host port speed
946 * @shost: scsi host struct
947 *
948 * Return value:
949 * none
950 **/
951static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
952{
953 struct ibmvfc_host *vhost = shost_priv(shost);
954 unsigned long flags;
955
956 spin_lock_irqsave(shost->host_lock, flags);
957 if (vhost->state == IBMVFC_ACTIVE) {
958 switch (vhost->login_buf->resp.link_speed / 100) {
959 case 1:
960 fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
961 break;
962 case 2:
963 fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
964 break;
965 case 4:
966 fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
967 break;
968 case 8:
969 fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
970 break;
971 case 10:
972 fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
973 break;
974 case 16:
975 fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
976 break;
977 default:
978 ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
979 vhost->login_buf->resp.link_speed / 100);
980 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
981 break;
982 }
983 } else
984 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
985 spin_unlock_irqrestore(shost->host_lock, flags);
986}
987
988/**
989 * ibmvfc_get_host_port_state - Get host port state
990 * @shost: scsi host struct
991 *
992 * Return value:
993 * none
994 **/
995static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
996{
997 struct ibmvfc_host *vhost = shost_priv(shost);
998 unsigned long flags;
999
1000 spin_lock_irqsave(shost->host_lock, flags);
1001 switch (vhost->state) {
1002 case IBMVFC_INITIALIZING:
1003 case IBMVFC_ACTIVE:
1004 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1005 break;
1006 case IBMVFC_LINK_DOWN:
1007 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1008 break;
1009 case IBMVFC_LINK_DEAD:
1010 case IBMVFC_HOST_OFFLINE:
1011 fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1012 break;
1013 case IBMVFC_HALTED:
1014 fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1015 break;
1016 case IBMVFC_NO_CRQ:
1017 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1018 break;
1019 default:
1020 ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1021 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1022 break;
1023 }
1024 spin_unlock_irqrestore(shost->host_lock, flags);
1025}
1026
1027/**
1028 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1029 * @rport: rport struct
1030 * @timeout: timeout value
1031 *
1032 * Return value:
1033 * none
1034 **/
1035static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1036{
1037 if (timeout)
1038 rport->dev_loss_tmo = timeout;
1039 else
1040 rport->dev_loss_tmo = 1;
1041}
1042
1043/**
1044 * ibmvfc_release_tgt - Free memory allocated for a target
1045 * @kref: kref struct
1046 *
1047 **/
1048static void ibmvfc_release_tgt(struct kref *kref)
1049{
1050 struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1051 kfree(tgt);
1052}
1053
1054/**
1055 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1056 * @starget: scsi target struct
1057 *
1058 * Return value:
1059 * none
1060 **/
1061static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1062{
1063 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1064 fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1065 if (tgt)
1066 kref_put(&tgt->kref, ibmvfc_release_tgt);
1067}
1068
1069/**
1070 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1071 * @starget: scsi target struct
1072 *
1073 * Return value:
1074 * none
1075 **/
1076static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1077{
1078 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1079 fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1080 if (tgt)
1081 kref_put(&tgt->kref, ibmvfc_release_tgt);
1082}
1083
1084/**
1085 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1086 * @starget: scsi target struct
1087 *
1088 * Return value:
1089 * none
1090 **/
1091static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1092{
1093 struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1094 fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1095 if (tgt)
1096 kref_put(&tgt->kref, ibmvfc_release_tgt);
1097}
1098
1099/**
1100 * ibmvfc_wait_while_resetting - Wait while the host resets
1101 * @vhost: ibmvfc host struct
1102 *
1103 * Return value:
1104 * 0 on success / other on failure
1105 **/
1106static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1107{
1108 long timeout = wait_event_timeout(vhost->init_wait_q,
1109 ((vhost->state == IBMVFC_ACTIVE ||
1110 vhost->state == IBMVFC_HOST_OFFLINE ||
1111 vhost->state == IBMVFC_LINK_DEAD) &&
1112 vhost->action == IBMVFC_HOST_ACTION_NONE),
1113 (init_timeout * HZ));
1114
1115 return timeout ? 0 : -EIO;
1116}
1117
1118/**
1119 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1120 * @shost: scsi host struct
1121 *
1122 * Return value:
1123 * 0 on success / other on failure
1124 **/
1125static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1126{
1127 struct ibmvfc_host *vhost = shost_priv(shost);
1128
1129 dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1130 ibmvfc_reset_host(vhost);
1131 return ibmvfc_wait_while_resetting(vhost);
1132}
1133
1134/**
1135 * ibmvfc_gather_partition_info - Gather info about the LPAR
1136 *
1137 * Return value:
1138 * none
1139 **/
1140static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1141{
1142 struct device_node *rootdn;
1143 const char *name;
1144 const unsigned int *num;
1145
1146 rootdn = of_find_node_by_path("/");
1147 if (!rootdn)
1148 return;
1149
1150 name = of_get_property(rootdn, "ibm,partition-name", NULL);
1151 if (name)
1152 strncpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1153 num = of_get_property(rootdn, "ibm,partition-no", NULL);
1154 if (num)
1155 vhost->partition_number = *num;
1156 of_node_put(rootdn);
1157}
1158
1159/**
1160 * ibmvfc_set_login_info - Setup info for NPIV login
1161 * @vhost: ibmvfc host struct
1162 *
1163 * Return value:
1164 * none
1165 **/
1166static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1167{
1168 struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1169 struct device_node *of_node = vhost->dev->of_node;
1170 const char *location;
1171
1172 memset(login_info, 0, sizeof(*login_info));
1173
1174 login_info->ostype = IBMVFC_OS_LINUX;
1175 login_info->max_dma_len = IBMVFC_MAX_SECTORS << 9;
1176 login_info->max_payload = sizeof(struct ibmvfc_fcp_cmd_iu);
1177 login_info->max_response = sizeof(struct ibmvfc_fcp_rsp);
1178 login_info->partition_num = vhost->partition_number;
1179 login_info->vfc_frame_version = 1;
1180 login_info->fcp_version = 3;
1181 login_info->flags = IBMVFC_FLUSH_ON_HALT;
1182 if (vhost->client_migrated)
1183 login_info->flags |= IBMVFC_CLIENT_MIGRATED;
1184
1185 login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1186 login_info->capabilities = IBMVFC_CAN_MIGRATE;
1187 login_info->async.va = vhost->async_crq.msg_token;
1188 login_info->async.len = vhost->async_crq.size * sizeof(*vhost->async_crq.msgs);
1189 strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
1190 strncpy(login_info->device_name,
1191 dev_name(&vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1192
1193 location = of_get_property(of_node, "ibm,loc-code", NULL);
1194 location = location ? location : dev_name(vhost->dev);
1195 strncpy(login_info->drc_name, location, IBMVFC_MAX_NAME);
1196}
1197
1198/**
1199 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
1200 * @vhost: ibmvfc host who owns the event pool
1201 *
1202 * Returns zero on success.
1203 **/
1204static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost)
1205{
1206 int i;
1207 struct ibmvfc_event_pool *pool = &vhost->pool;
1208
1209 ENTER;
1210 pool->size = max_requests + IBMVFC_NUM_INTERNAL_REQ;
1211 pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
1212 if (!pool->events)
1213 return -ENOMEM;
1214
1215 pool->iu_storage = dma_alloc_coherent(vhost->dev,
1216 pool->size * sizeof(*pool->iu_storage),
1217 &pool->iu_token, 0);
1218
1219 if (!pool->iu_storage) {
1220 kfree(pool->events);
1221 return -ENOMEM;
1222 }
1223
1224 for (i = 0; i < pool->size; ++i) {
1225 struct ibmvfc_event *evt = &pool->events[i];
1226 atomic_set(&evt->free, 1);
1227 evt->crq.valid = 0x80;
1228 evt->crq.ioba = pool->iu_token + (sizeof(*evt->xfer_iu) * i);
1229 evt->xfer_iu = pool->iu_storage + i;
1230 evt->vhost = vhost;
1231 evt->ext_list = NULL;
1232 list_add_tail(&evt->queue, &vhost->free);
1233 }
1234
1235 LEAVE;
1236 return 0;
1237}
1238
1239/**
1240 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
1241 * @vhost: ibmvfc host who owns the event pool
1242 *
1243 **/
1244static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost)
1245{
1246 int i;
1247 struct ibmvfc_event_pool *pool = &vhost->pool;
1248
1249 ENTER;
1250 for (i = 0; i < pool->size; ++i) {
1251 list_del(&pool->events[i].queue);
1252 BUG_ON(atomic_read(&pool->events[i].free) != 1);
1253 if (pool->events[i].ext_list)
1254 dma_pool_free(vhost->sg_pool,
1255 pool->events[i].ext_list,
1256 pool->events[i].ext_list_token);
1257 }
1258
1259 kfree(pool->events);
1260 dma_free_coherent(vhost->dev,
1261 pool->size * sizeof(*pool->iu_storage),
1262 pool->iu_storage, pool->iu_token);
1263 LEAVE;
1264}
1265
1266/**
1267 * ibmvfc_get_event - Gets the next free event in pool
1268 * @vhost: ibmvfc host struct
1269 *
1270 * Returns a free event from the pool.
1271 **/
1272static struct ibmvfc_event *ibmvfc_get_event(struct ibmvfc_host *vhost)
1273{
1274 struct ibmvfc_event *evt;
1275
1276 BUG_ON(list_empty(&vhost->free));
1277 evt = list_entry(vhost->free.next, struct ibmvfc_event, queue);
1278 atomic_set(&evt->free, 0);
1279 list_del(&evt->queue);
1280 return evt;
1281}
1282
1283/**
1284 * ibmvfc_init_event - Initialize fields in an event struct that are always
1285 * required.
1286 * @evt: The event
1287 * @done: Routine to call when the event is responded to
1288 * @format: SRP or MAD format
1289 **/
1290static void ibmvfc_init_event(struct ibmvfc_event *evt,
1291 void (*done) (struct ibmvfc_event *), u8 format)
1292{
1293 evt->cmnd = NULL;
1294 evt->sync_iu = NULL;
1295 evt->crq.format = format;
1296 evt->done = done;
1297 evt->eh_comp = NULL;
1298}
1299
1300/**
1301 * ibmvfc_map_sg_list - Initialize scatterlist
1302 * @scmd: scsi command struct
1303 * @nseg: number of scatterlist segments
1304 * @md: memory descriptor list to initialize
1305 **/
1306static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1307 struct srp_direct_buf *md)
1308{
1309 int i;
1310 struct scatterlist *sg;
1311
1312 scsi_for_each_sg(scmd, sg, nseg, i) {
1313 md[i].va = sg_dma_address(sg);
1314 md[i].len = sg_dma_len(sg);
1315 md[i].key = 0;
1316 }
1317}
1318
1319/**
1320 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes decriptor fields
1321 * @scmd: Scsi_Cmnd with the scatterlist
1322 * @evt: ibmvfc event struct
1323 * @vfc_cmd: vfc_cmd that contains the memory descriptor
1324 * @dev: device for which to map dma memory
1325 *
1326 * Returns:
1327 * 0 on success / non-zero on failure
1328 **/
1329static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1330 struct ibmvfc_event *evt,
1331 struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1332{
1333
1334 int sg_mapped;
1335 struct srp_direct_buf *data = &vfc_cmd->ioba;
1336 struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1337
1338 sg_mapped = scsi_dma_map(scmd);
1339 if (!sg_mapped) {
1340 vfc_cmd->flags |= IBMVFC_NO_MEM_DESC;
1341 return 0;
1342 } else if (unlikely(sg_mapped < 0)) {
1343 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1344 scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1345 return sg_mapped;
1346 }
1347
1348 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1349 vfc_cmd->flags |= IBMVFC_WRITE;
1350 vfc_cmd->iu.add_cdb_len |= IBMVFC_WRDATA;
1351 } else {
1352 vfc_cmd->flags |= IBMVFC_READ;
1353 vfc_cmd->iu.add_cdb_len |= IBMVFC_RDDATA;
1354 }
1355
1356 if (sg_mapped == 1) {
1357 ibmvfc_map_sg_list(scmd, sg_mapped, data);
1358 return 0;
1359 }
1360
1361 vfc_cmd->flags |= IBMVFC_SCATTERLIST;
1362
1363 if (!evt->ext_list) {
1364 evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1365 &evt->ext_list_token);
1366
1367 if (!evt->ext_list) {
1368 scsi_dma_unmap(scmd);
1369 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1370 scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1371 return -ENOMEM;
1372 }
1373 }
1374
1375 ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1376
1377 data->va = evt->ext_list_token;
1378 data->len = sg_mapped * sizeof(struct srp_direct_buf);
1379 data->key = 0;
1380 return 0;
1381}
1382
1383/**
1384 * ibmvfc_timeout - Internal command timeout handler
1385 * @evt: struct ibmvfc_event that timed out
1386 *
1387 * Called when an internally generated command times out
1388 **/
1389static void ibmvfc_timeout(struct ibmvfc_event *evt)
1390{
1391 struct ibmvfc_host *vhost = evt->vhost;
1392 dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1393 ibmvfc_reset_host(vhost);
1394}
1395
1396/**
1397 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1398 * @evt: event to be sent
1399 * @vhost: ibmvfc host struct
1400 * @timeout: timeout in seconds - 0 means do not time command
1401 *
1402 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1403 **/
1404static int ibmvfc_send_event(struct ibmvfc_event *evt,
1405 struct ibmvfc_host *vhost, unsigned long timeout)
1406{
1407 u64 *crq_as_u64 = (u64 *) &evt->crq;
1408 int rc;
1409
1410 /* Copy the IU into the transfer area */
1411 *evt->xfer_iu = evt->iu;
1412 if (evt->crq.format == IBMVFC_CMD_FORMAT)
1413 evt->xfer_iu->cmd.tag = (u64)evt;
1414 else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1415 evt->xfer_iu->mad_common.tag = (u64)evt;
1416 else
1417 BUG();
1418
1419 list_add_tail(&evt->queue, &vhost->sent);
1420 init_timer(&evt->timer);
1421
1422 if (timeout) {
1423 evt->timer.data = (unsigned long) evt;
1424 evt->timer.expires = jiffies + (timeout * HZ);
1425 evt->timer.function = (void (*)(unsigned long))ibmvfc_timeout;
1426 add_timer(&evt->timer);
1427 }
1428
1429 mb();
1430
1431 if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
1432 list_del(&evt->queue);
1433 del_timer(&evt->timer);
1434
1435 /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1436 * Firmware will send a CRQ with a transport event (0xFF) to
1437 * tell this client what has happened to the transport. This
1438 * will be handled in ibmvfc_handle_crq()
1439 */
1440 if (rc == H_CLOSED) {
1441 if (printk_ratelimit())
1442 dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1443 if (evt->cmnd)
1444 scsi_dma_unmap(evt->cmnd);
1445 ibmvfc_free_event(evt);
1446 return SCSI_MLQUEUE_HOST_BUSY;
1447 }
1448
1449 dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1450 if (evt->cmnd) {
1451 evt->cmnd->result = DID_ERROR << 16;
1452 evt->done = ibmvfc_scsi_eh_done;
1453 } else
1454 evt->xfer_iu->mad_common.status = IBMVFC_MAD_CRQ_ERROR;
1455
1456 evt->done(evt);
1457 } else
1458 ibmvfc_trc_start(evt);
1459
1460 return 0;
1461}
1462
1463/**
1464 * ibmvfc_log_error - Log an error for the failed command if appropriate
1465 * @evt: ibmvfc event to log
1466 *
1467 **/
1468static void ibmvfc_log_error(struct ibmvfc_event *evt)
1469{
1470 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1471 struct ibmvfc_host *vhost = evt->vhost;
1472 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1473 struct scsi_cmnd *cmnd = evt->cmnd;
1474 const char *err = unknown_error;
1475 int index = ibmvfc_get_err_index(vfc_cmd->status, vfc_cmd->error);
1476 int logerr = 0;
1477 int rsp_code = 0;
1478
1479 if (index >= 0) {
1480 logerr = cmd_status[index].log;
1481 err = cmd_status[index].name;
1482 }
1483
1484 if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1485 return;
1486
1487 if (rsp->flags & FCP_RSP_LEN_VALID)
1488 rsp_code = rsp->data.info.rsp_code;
1489
1490 scmd_printk(KERN_ERR, cmnd, "Command (%02X) failed: %s (%x:%x) "
1491 "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1492 cmnd->cmnd[0], err, vfc_cmd->status, vfc_cmd->error,
1493 rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1494}
1495
1496/**
1497 * ibmvfc_relogin - Log back into the specified device
1498 * @sdev: scsi device struct
1499 *
1500 **/
1501static void ibmvfc_relogin(struct scsi_device *sdev)
1502{
1503 struct ibmvfc_host *vhost = shost_priv(sdev->host);
1504 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1505 struct ibmvfc_target *tgt;
1506
1507 list_for_each_entry(tgt, &vhost->targets, queue) {
1508 if (rport == tgt->rport) {
1509 ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
1510 break;
1511 }
1512 }
1513
1514 ibmvfc_reinit_host(vhost);
1515}
1516
1517/**
1518 * ibmvfc_scsi_done - Handle responses from commands
1519 * @evt: ibmvfc event to be handled
1520 *
1521 * Used as a callback when sending scsi cmds.
1522 **/
1523static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1524{
1525 struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1526 struct ibmvfc_fcp_rsp *rsp = &vfc_cmd->rsp;
1527 struct scsi_cmnd *cmnd = evt->cmnd;
1528 u32 rsp_len = 0;
1529 u32 sense_len = rsp->fcp_sense_len;
1530
1531 if (cmnd) {
1532 if (vfc_cmd->response_flags & IBMVFC_ADAPTER_RESID_VALID)
1533 scsi_set_resid(cmnd, vfc_cmd->adapter_resid);
1534 else if (rsp->flags & FCP_RESID_UNDER)
1535 scsi_set_resid(cmnd, rsp->fcp_resid);
1536 else
1537 scsi_set_resid(cmnd, 0);
1538
1539 if (vfc_cmd->status) {
1540 cmnd->result = ibmvfc_get_err_result(vfc_cmd);
1541
1542 if (rsp->flags & FCP_RSP_LEN_VALID)
1543 rsp_len = rsp->fcp_rsp_len;
1544 if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1545 sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1546 if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1547 memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1548 if ((vfc_cmd->status & IBMVFC_VIOS_FAILURE) && (vfc_cmd->error == IBMVFC_PLOGI_REQUIRED))
1549 ibmvfc_relogin(cmnd->device);
1550
1551 if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1552 cmnd->result = (DID_ERROR << 16);
1553
1554 ibmvfc_log_error(evt);
1555 }
1556
1557 if (!cmnd->result &&
1558 (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1559 cmnd->result = (DID_ERROR << 16);
1560
1561 scsi_dma_unmap(cmnd);
1562 cmnd->scsi_done(cmnd);
1563 }
1564
1565 if (evt->eh_comp)
1566 complete(evt->eh_comp);
1567
1568 ibmvfc_free_event(evt);
1569}
1570
1571/**
1572 * ibmvfc_host_chkready - Check if the host can accept commands
1573 * @vhost: struct ibmvfc host
1574 *
1575 * Returns:
1576 * 1 if host can accept command / 0 if not
1577 **/
1578static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1579{
1580 int result = 0;
1581
1582 switch (vhost->state) {
1583 case IBMVFC_LINK_DEAD:
1584 case IBMVFC_HOST_OFFLINE:
1585 result = DID_NO_CONNECT << 16;
1586 break;
1587 case IBMVFC_NO_CRQ:
1588 case IBMVFC_INITIALIZING:
1589 case IBMVFC_HALTED:
1590 case IBMVFC_LINK_DOWN:
1591 result = DID_REQUEUE << 16;
1592 break;
1593 case IBMVFC_ACTIVE:
1594 result = 0;
1595 break;
1596 };
1597
1598 return result;
1599}
1600
1601/**
1602 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1603 * @cmnd: struct scsi_cmnd to be executed
1604 * @done: Callback function to be called when cmnd is completed
1605 *
1606 * Returns:
1607 * 0 on success / other on failure
1608 **/
1609static int ibmvfc_queuecommand_lck(struct scsi_cmnd *cmnd,
1610 void (*done) (struct scsi_cmnd *))
1611{
1612 struct ibmvfc_host *vhost = shost_priv(cmnd->device->host);
1613 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1614 struct ibmvfc_cmd *vfc_cmd;
1615 struct ibmvfc_event *evt;
1616 u8 tag[2];
1617 int rc;
1618
1619 if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1620 unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1621 cmnd->result = rc;
1622 done(cmnd);
1623 return 0;
1624 }
1625
1626 cmnd->result = (DID_OK << 16);
1627 evt = ibmvfc_get_event(vhost);
1628 ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1629 evt->cmnd = cmnd;
1630 cmnd->scsi_done = done;
1631 vfc_cmd = &evt->iu.cmd;
1632 memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1633 vfc_cmd->resp.va = (u64)evt->crq.ioba + offsetof(struct ibmvfc_cmd, rsp);
1634 vfc_cmd->resp.len = sizeof(vfc_cmd->rsp);
1635 vfc_cmd->frame_type = IBMVFC_SCSI_FCP_TYPE;
1636 vfc_cmd->payload_len = sizeof(vfc_cmd->iu);
1637 vfc_cmd->resp_len = sizeof(vfc_cmd->rsp);
1638 vfc_cmd->cancel_key = (unsigned long)cmnd->device->hostdata;
1639 vfc_cmd->tgt_scsi_id = rport->port_id;
1640 vfc_cmd->iu.xfer_len = scsi_bufflen(cmnd);
1641 int_to_scsilun(cmnd->device->lun, &vfc_cmd->iu.lun);
1642 memcpy(vfc_cmd->iu.cdb, cmnd->cmnd, cmnd->cmd_len);
1643
1644 if (scsi_populate_tag_msg(cmnd, tag)) {
1645 vfc_cmd->task_tag = tag[1];
1646 switch (tag[0]) {
1647 case MSG_SIMPLE_TAG:
1648 vfc_cmd->iu.pri_task_attr = IBMVFC_SIMPLE_TASK;
1649 break;
1650 case MSG_HEAD_TAG:
1651 vfc_cmd->iu.pri_task_attr = IBMVFC_HEAD_OF_QUEUE;
1652 break;
1653 case MSG_ORDERED_TAG:
1654 vfc_cmd->iu.pri_task_attr = IBMVFC_ORDERED_TASK;
1655 break;
1656 };
1657 }
1658
1659 if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
1660 return ibmvfc_send_event(evt, vhost, 0);
1661
1662 ibmvfc_free_event(evt);
1663 if (rc == -ENOMEM)
1664 return SCSI_MLQUEUE_HOST_BUSY;
1665
1666 if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1667 scmd_printk(KERN_ERR, cmnd,
1668 "Failed to map DMA buffer for command. rc=%d\n", rc);
1669
1670 cmnd->result = DID_ERROR << 16;
1671 done(cmnd);
1672 return 0;
1673}
1674
1675static DEF_SCSI_QCMD(ibmvfc_queuecommand)
1676
1677/**
1678 * ibmvfc_sync_completion - Signal that a synchronous command has completed
1679 * @evt: ibmvfc event struct
1680 *
1681 **/
1682static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
1683{
1684 /* copy the response back */
1685 if (evt->sync_iu)
1686 *evt->sync_iu = *evt->xfer_iu;
1687
1688 complete(&evt->comp);
1689}
1690
1691/**
1692 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
1693 * @evt: struct ibmvfc_event
1694 *
1695 **/
1696static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
1697{
1698 struct ibmvfc_host *vhost = evt->vhost;
1699
1700 ibmvfc_free_event(evt);
1701 vhost->aborting_passthru = 0;
1702 dev_info(vhost->dev, "Passthru command cancelled\n");
1703}
1704
1705/**
1706 * ibmvfc_bsg_timeout - Handle a BSG timeout
1707 * @job: struct fc_bsg_job that timed out
1708 *
1709 * Returns:
1710 * 0 on success / other on failure
1711 **/
1712static int ibmvfc_bsg_timeout(struct fc_bsg_job *job)
1713{
1714 struct ibmvfc_host *vhost = shost_priv(job->shost);
1715 unsigned long port_id = (unsigned long)job->dd_data;
1716 struct ibmvfc_event *evt;
1717 struct ibmvfc_tmf *tmf;
1718 unsigned long flags;
1719 int rc;
1720
1721 ENTER;
1722 spin_lock_irqsave(vhost->host->host_lock, flags);
1723 if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
1724 __ibmvfc_reset_host(vhost);
1725 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1726 return 0;
1727 }
1728
1729 vhost->aborting_passthru = 1;
1730 evt = ibmvfc_get_event(vhost);
1731 ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
1732
1733 tmf = &evt->iu.tmf;
1734 memset(tmf, 0, sizeof(*tmf));
1735 tmf->common.version = 1;
1736 tmf->common.opcode = IBMVFC_TMF_MAD;
1737 tmf->common.length = sizeof(*tmf);
1738 tmf->scsi_id = port_id;
1739 tmf->cancel_key = IBMVFC_PASSTHRU_CANCEL_KEY;
1740 tmf->my_cancel_key = IBMVFC_INTERNAL_CANCEL_KEY;
1741 rc = ibmvfc_send_event(evt, vhost, default_timeout);
1742
1743 if (rc != 0) {
1744 vhost->aborting_passthru = 0;
1745 dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
1746 rc = -EIO;
1747 } else
1748 dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
1749 port_id);
1750
1751 spin_unlock_irqrestore(vhost->host->host_lock, flags);
1752
1753 LEAVE;
1754 return rc;
1755}
1756
1757/**
1758 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
1759 * @vhost: struct ibmvfc_host to send command
1760 * @port_id: port ID to send command
1761 *
1762 * Returns:
1763 * 0 on success / other on failure
1764 **/
1765static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
1766{
1767 struct ibmvfc_port_login *plogi;
1768 struct ibmvfc_target *tgt;
1769 struct ibmvfc_event *evt;
1770 union ibmvfc_iu rsp_iu;
1771 unsigned long flags;
1772 int rc = 0, issue_login = 1;
1773
1774 ENTER;
1775 spin_lock_irqsave(vhost->host->host_lock, flags);
1776 list_for_each_entry(tgt, &vhost->targets, queue) {
1777 if (tgt->scsi_id == port_id) {
1778 issue_login = 0;
1779 break;
1780 }
1781 }
1782
1783 if (!issue_login)
1784 goto unlock_out;
1785 if (unlikely((rc = ibmvfc_host_chkready(vhost))))
1786 goto unlock_out;
1787
1788 evt = ibmvfc_get_event(vhost);
1789 ibmvfc_init_event(evt, ibmvfc_sync_completion,…Large files files are truncated, but you can click here to view the full file