Fixes wrong sess_count decrement on session registration failure
[mirror/scst/.git] / qla2x00t / qla2x00-target / qla2x00t.c
1 /*
2  *  qla2x00t.c
3  *
4  *  Copyright (C) 2004 - 2008 Vladislav Bolkhovitin <vst@vlnb.net>
5  *  Copyright (C) 2004 - 2005 Leonid Stoljar
6  *  Copyright (C) 2006 Nathaniel Clark <nate@misrule.us>
7  *
8  *  QLogic 2x00 SCSI target driver.
9  *
10  *  This program is free software; you can redistribute it and/or
11  *  modify it under the terms of the GNU General Public License
12  *  as published by the Free Software Foundation, version 2
13  *  of the License.
14  *
15  *  This program is distributed in the hope that it will be useful,
16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  *  GNU General Public License for more details.
19  */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/types.h>
24 #include <linux/version.h>
25 #include <linux/blkdev.h>
26 #include <linux/interrupt.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <linux/pci.h>
30 #include <linux/delay.h>
31 #include <linux/seq_file.h>
32 #include <linux/list.h>
33
34 #include <scst.h>
35
36 #include "qla2x00t.h"
37
38 #if !defined(CONFIG_SCSI_QLA2XXX_TARGET)
39 #error "CONFIG_SCSI_QLA2XXX_TARGET is NOT DEFINED"
40 #endif
41
42 #ifdef CONFIG_SCST_DEBUG
43 #define Q2T_DEFAULT_LOG_FLAGS (TRACE_FUNCTION | TRACE_PID | \
44         TRACE_OUT_OF_MEM | TRACE_MGMT | TRACE_MGMT_MINOR | \
45         TRACE_MGMT_DEBUG | TRACE_MINOR | TRACE_SPECIAL)
46 #else
47 # ifdef CONFIG_SCST_TRACING
48 #define Q2T_DEFAULT_LOG_FLAGS (TRACE_OUT_OF_MEM | TRACE_MGMT | TRACE_MINOR | \
49         TRACE_SPECIAL)
50 # endif
51 #endif
52
53 static int q2t_target_detect(struct scst_tgt_template *templ);
54 static int q2t_target_release(struct scst_tgt *scst_tgt);
55 static int q2t_xmit_response(struct scst_cmd *scst_cmd);
56 static int q2t_rdy_to_xfer(struct scst_cmd *scst_cmd);
57 static void q2t_on_free_cmd(struct scst_cmd *scst_cmd);
58 static void q2t_task_mgmt_fn_done(struct scst_mgmt_cmd *mcmd);
59
60 /* Predefs for callbacks handed to qla2xxx(target) */
61 static void q2t_response_pkt(scsi_qla_host_t *ha, sts_entry_t *pkt);
62 static void q2t_async_event(uint16_t code, scsi_qla_host_t *ha,
63         uint16_t *mailbox);
64 static void q2t_ctio_completion(scsi_qla_host_t *ha, uint32_t handle);
65 static void q2t_host_action(scsi_qla_host_t *ha,
66         qla2x_tgt_host_action_t action);
67 static void q2t_send_term_exchange(scsi_qla_host_t *ha, struct q2t_cmd *cmd,
68         atio_entry_t *atio, int ha_locked);
69
70 /*
71  * Global Variables
72  */
73
74 #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
75 #define trace_flag q2t_trace_flag
76 unsigned long q2t_trace_flag = Q2T_DEFAULT_LOG_FLAGS;
77 #endif
78
79 struct scst_tgt_template tgt_template = {
80         name: "qla2x00tgt",
81         sg_tablesize: 0,
82         use_clustering: 1,
83 #ifdef CONFIG_QLA_TGT_DEBUG_WORK_IN_THREAD
84         xmit_response_atomic: 0,
85         rdy_to_xfer_atomic: 0,
86 #else
87         xmit_response_atomic: 1,
88         rdy_to_xfer_atomic: 1,
89 #endif
90         detect: q2t_target_detect,
91         release: q2t_target_release,
92         xmit_response: q2t_xmit_response,
93         rdy_to_xfer: q2t_rdy_to_xfer,
94         on_free_cmd: q2t_on_free_cmd,
95         task_mgmt_fn_done: q2t_task_mgmt_fn_done,
96 };
97
98 struct kmem_cache *q2t_cmd_cachep = NULL;
99 static struct qla2x_tgt_target tgt_data;
100
101 /*
102  * Functions
103  */
104
105 static inline int test_tgt_sess_count(struct q2t_tgt *tgt, scsi_qla_host_t *ha)
106 {
107         unsigned long flags;
108         int res;
109
110         /*
111          * We need to protect against race, when tgt is freed before or
112          * inside wake_up()
113          */
114         spin_lock_irqsave(&tgt->ha->hardware_lock, flags);
115         TRACE_DBG("tgt %p, empty(sess_list)=%d sess_count=%d",
116               tgt, list_empty(&tgt->sess_list), tgt->sess_count);
117         res = (tgt->sess_count == 0);
118         spin_unlock_irqrestore(&tgt->ha->hardware_lock, flags);
119
120         return res;
121 }
122
123 /* ha->hardware_lock supposed to be held on entry */
124 static inline void q2t_exec_queue(scsi_qla_host_t *ha)
125 {
126         tgt_data.isp_cmd(ha);
127 }
128
129 /* ha->hardware_lock supposed to be held on entry */
130 static void q2t_modify_command_count(scsi_qla_host_t *ha, int cmd_count,
131         int imm_count)
132 {
133         modify_lun_entry_t *pkt;
134
135         TRACE_ENTRY();
136
137         TRACE_DBG("Sending MODIFY_LUN ha %p, cmd %d, imm %d",
138                   ha, cmd_count, imm_count);
139
140         pkt = (modify_lun_entry_t *)tgt_data.req_pkt(ha);
141         ha->tgt->modify_lun_expected++;
142
143         pkt->entry_type = MODIFY_LUN_TYPE;
144         pkt->entry_count = 1;
145         if (cmd_count < 0) {
146                 pkt->operators = MODIFY_LUN_CMD_SUB;    /* Subtract from command count */
147                 pkt->command_count = -cmd_count;
148         } else if (cmd_count > 0){
149                 pkt->operators = MODIFY_LUN_CMD_ADD;    /* Add to command count */
150                 pkt->command_count = cmd_count;
151         }
152
153         if (imm_count < 0) {
154                 pkt->operators |= MODIFY_LUN_IMM_SUB;
155                 pkt->immed_notify_count = -imm_count;
156         } else if (imm_count > 0) {
157                 pkt->operators |= MODIFY_LUN_IMM_ADD;
158                 pkt->immed_notify_count = imm_count;
159         }
160
161         pkt->timeout = 0;       /* Use default */
162         q2t_exec_queue(ha);
163
164         TRACE_EXIT();
165         return;
166 }
167
168 /* ha->hardware_lock supposed to be held on entry */
169 static void __q2t_send_notify_ack(scsi_qla_host_t *ha,
170          uint16_t target_id, uint16_t status, uint16_t task_flags,
171          uint16_t seq_id, uint32_t add_flags, uint16_t resp_code,
172          int resp_code_valid, uint16_t ox_id)
173 {
174         nack_entry_t *ntfy;
175
176         TRACE_ENTRY();
177
178         /* Send marker if required */
179         if (tgt_data.issue_marker(ha) != QLA_SUCCESS) {
180                 PRINT_ERROR("qla2x00tgt(%ld): __QLA2X00_MARKER() "
181                             "failed", ha->instance);
182                 goto out;
183         }
184
185         ntfy = (nack_entry_t *)tgt_data.req_pkt(ha);
186
187         if (ha->tgt != NULL)
188                 ha->tgt->notify_ack_expected++;
189
190         memset(ntfy, 0, sizeof(*ntfy));
191         ntfy->entry_type = NOTIFY_ACK_TYPE;
192         ntfy->entry_count = 1;
193         SET_TARGET_ID(ha, ntfy->target, target_id);
194         ntfy->status = status;
195         ntfy->task_flags = task_flags;
196         ntfy->seq_id = seq_id;
197         /* Do not increment here, the chip isn't decrementing */
198         /* ntfy->flags = __constant_cpu_to_le16(NOTIFY_ACK_RES_COUNT); */
199         ntfy->flags |= cpu_to_le16(add_flags);
200         ntfy->ox_id = ox_id;
201
202         if (resp_code_valid) {
203                 ntfy->resp_code = cpu_to_le16(resp_code);
204                 ntfy->flags |=
205                         __constant_cpu_to_le16(NOTIFY_ACK_TM_RESP_CODE_VALID);
206         }
207
208         TRACE(TRACE_SCSI, "Sending Notify Ack Seq %#x -> I %#x St %#x RC %#x",
209               le16_to_cpu(seq_id), target_id, le16_to_cpu(status),
210               le16_to_cpu(ntfy->resp_code));
211
212         q2t_exec_queue(ha);
213
214 out:
215         TRACE_EXIT();
216         return;
217 }
218 /* ha->hardware_lock supposed to be held on entry */
219 static inline void q2t_send_notify_ack(scsi_qla_host_t *ha,
220         notify_entry_t *iocb, uint32_t add_flags, uint16_t resp_code,
221         int resp_code_valid)
222 {
223         __q2t_send_notify_ack(ha,  GET_TARGET_ID(ha, iocb), iocb->status,
224               iocb->task_flags, iocb->seq_id, add_flags, resp_code,
225               resp_code_valid, iocb->ox_id);
226 }
227
228 /*
229  * register with initiator driver (but target mode isn't enabled till
230  * it's turned on via sysfs)
231  */
232 static int q2t_target_detect(struct scst_tgt_template *templ)
233 {
234         int res;
235         struct qla2x_tgt_initiator itd = {
236                 magic:QLA2X_TARGET_MAGIC,
237                 tgt_response_pkt:q2t_response_pkt,
238                 tgt_ctio_completion:q2t_ctio_completion,
239                 tgt_async_event:q2t_async_event,
240                 tgt_host_action:q2t_host_action,
241         };
242
243         TRACE_ENTRY();
244
245         res = qla2xxx_tgt_register_driver(&itd, &tgt_data);
246         if (res != 0) {
247                 PRINT_ERROR("Unable to register driver: %d", res);
248                 goto out;
249         }
250
251         if (tgt_data.magic != QLA2X_INITIATOR_MAGIC) {
252                 PRINT_ERROR("Wrong version of the initiator driver: %d",
253                             tgt_data.magic);
254                 res = -EINVAL;
255         }
256
257 out:
258         TRACE_EXIT();
259         return res;
260 }
261
262 /* no lock held */
263 static void q2t_free_session_done(struct scst_session *scst_sess)
264 {
265         struct q2t_sess *sess;
266         struct q2t_tgt *tgt;
267         scsi_qla_host_t *ha;
268         unsigned long flags;
269
270         TRACE_ENTRY();
271
272         sBUG_ON(scst_sess == NULL);
273         sess = (struct q2t_sess *)scst_sess_get_tgt_priv(scst_sess);
274         sBUG_ON(sess == NULL);
275         tgt = sess->tgt;
276
277         kfree(sess);
278
279         if (tgt == NULL)
280                 goto out;
281
282         TRACE_MGMT_DBG("tgt %p, empty(sess_list) %d, sess_count %d",
283               tgt, list_empty(&tgt->sess_list), tgt->sess_count);
284
285         ha = tgt->ha;
286
287         /*
288          * We need to protect against race, when tgt is freed before or
289          * inside wake_up()
290          */
291         spin_lock_irqsave(&ha->hardware_lock, flags);
292         tgt->sess_count--;
293         if (tgt->sess_count == 0)
294                 wake_up_all(&tgt->waitQ);
295         spin_unlock_irqrestore(&ha->hardware_lock, flags);
296
297 out:
298         TRACE_EXIT();
299         return;
300 }
301
302 /* ha->hardware_lock supposed to be held on entry */
303 static void q2t_unreg_sess(struct q2t_sess *sess)
304 {
305         TRACE_ENTRY();
306
307         if (sess == NULL)
308                 goto out;
309
310         list_del(&sess->list);
311
312         PRINT_INFO("qla2x00tgt(%ld): session for loop_id %d deleted",
313                 sess->tgt->ha->instance, sess->loop_id);
314
315         /*
316          * Any commands for this session will be finished regularly,
317          * because we must not drop SCSI commands on transport level,
318          * at least without any response to the initiator.
319          */
320
321         scst_unregister_session(sess->scst_sess, 0, q2t_free_session_done);
322
323 out:
324         TRACE_EXIT();
325         return;
326 }
327
328 /* ha->hardware_lock supposed to be held on entry */
329 static void q2t_port_logout(scsi_qla_host_t *ha, int loop_id)
330 {
331         struct q2t_sess *sess = q2t_find_sess_by_lid(ha->tgt, loop_id);
332
333         TRACE_MGMT_DBG("scsi(%ld) Unregistering session %p loop_id=%d",
334               ha->host_no, sess, loop_id);
335
336         q2t_unreg_sess(sess);
337 }
338
339 /* ha->hardware_lock supposed to be held on entry */
340 static void q2t_clear_tgt_db(struct q2t_tgt *tgt)
341 {
342         struct q2t_sess *sess, *sess_tmp;
343
344         TRACE_ENTRY();
345
346         TRACE_MGMT_DBG("Clearing targets DB %p", tgt);
347
348         list_for_each_entry_safe(sess, sess_tmp, &tgt->sess_list, list) {
349                 q2t_unreg_sess(sess);
350         }
351
352         /* At this point tgt could be already dead */
353
354         TRACE_MGMT_DBG("Finished clearing Target DB %p", tgt);
355
356         TRACE_EXIT();
357         return;
358 }
359
360 /* should be called w/out hardware_lock, but tgt should be
361  * unfindable at this point */
362 static int q2t_target_release(struct scst_tgt *scst_tgt)
363 {
364         int res = 0;
365         struct q2t_tgt *tgt = (struct q2t_tgt *)scst_tgt_get_tgt_priv(scst_tgt);
366         scsi_qla_host_t *ha = tgt->ha;
367         unsigned long flags = 0;
368
369         TRACE_ENTRY();
370
371         spin_lock_irqsave(&ha->hardware_lock, flags);
372         tgt->tgt_shutdown = 1;
373         q2t_clear_tgt_db(tgt);
374         spin_unlock_irqrestore(&ha->hardware_lock, flags);
375
376         wait_event(tgt->waitQ, test_tgt_sess_count(tgt, ha));
377
378         /* big hammer */
379         if(!ha->flags.host_shutting_down)
380                 tgt_data.disable_lun(ha);
381
382         /* wait for sessions to clear out (just in case) */
383         wait_event(tgt->waitQ, test_tgt_sess_count(tgt, ha));
384
385         TRACE_MGMT_DBG("Finished waiting for tgt %p: empty(sess_list)=%d "
386                 "sess_count=%d", tgt, list_empty(&tgt->sess_list),
387                 tgt->sess_count);
388
389         /* The lock is needed, because we still can get an incoming packet */
390         spin_lock_irqsave(&ha->hardware_lock, flags);
391         scst_tgt_set_tgt_priv(scst_tgt, NULL);
392         ha->tgt = NULL;
393         spin_unlock_irqrestore(&ha->hardware_lock, flags);
394
395         kfree(tgt);
396
397         TRACE_EXIT_RES(res);
398         return res;
399 }
400
401 static int q2t_pci_map_calc_cnt(struct q2t_prm *prm)
402 {
403         int res = 0;
404
405         sBUG_ON(prm->sg_cnt == 0);
406
407         /* 32 bit S/G Data Transfer */
408         prm->seg_cnt = pci_map_sg(prm->tgt->ha->pdev, prm->sg, prm->sg_cnt,
409                                scst_to_tgt_dma_dir(prm->data_direction));
410         if (unlikely(prm->seg_cnt == 0))
411                 goto out_err;
412         /*
413          * If greater than four sg entries then we need to allocate
414          * the continuation entries
415          */
416         if (prm->seg_cnt > prm->tgt->datasegs_per_cmd) {
417                 prm->req_cnt += (uint16_t)(prm->seg_cnt -
418                                 prm->tgt->datasegs_per_cmd) /
419                                 prm->tgt->datasegs_per_cont;
420                 if (((uint16_t)(prm->seg_cnt - prm->tgt->datasegs_per_cmd)) %
421                                         prm->tgt->datasegs_per_cont)
422                 {
423                         prm->req_cnt++;
424                 }
425         }
426
427 out:
428         TRACE_DBG("seg_cnt=%d, req_cnt=%d, res=%d", prm->seg_cnt,
429                 prm->req_cnt, res);
430         return res;
431
432 out_err:
433         PRINT_ERROR("qla2x00tgt(%ld): PCI mapping failed: sg_cnt=%d",
434                 prm->tgt->ha->instance, prm->sg_cnt);
435         res = -1;
436         goto out;
437 }
438
439 /* ha->hardware_lock supposed to be held on entry */
440 static inline uint32_t q2t_make_handle(scsi_qla_host_t *ha)
441 {
442         uint32_t h;
443
444         h = ha->current_cmd;
445         /* always increment cmd handle */
446         do {
447                 ++h;
448                 if (h > MAX_OUTSTANDING_COMMANDS) {
449                         h = 0;
450                 }
451                 if (h == ha->current_cmd) {
452                         TRACE(TRACE_OUT_OF_MEM, "Ran out of empty cmd slots "
453                                 "in ha %p", ha);
454                         h = Q2T_NULL_HANDLE;
455                         break;
456                 }
457         } while ((h == Q2T_NULL_HANDLE) ||
458                  (h == Q2T_BUSY_HANDLE) ||
459                  (h == Q2T_SKIP_HANDLE) ||
460                  (ha->cmds[h] != NULL));
461
462         if (h != Q2T_NULL_HANDLE)
463                 ha->current_cmd = h;
464
465         return h;
466 }
467
468 /* ha->hardware_lock supposed to be held on entry */
469 /*
470  * NOTE: About CTIO_COMPLETION_HANDLE
471  *  This is checked for in qla2x00_process_response_queue() to see
472  *  if a handle coming back in a multi-complete should come to the tgt driver
473  *  or be handled there by qla2xxx
474  */
475 static void q2t_build_ctio_pkt(struct q2t_prm *prm)
476 {
477         uint16_t timeout;
478         uint32_t h;
479
480         prm->pkt = (ctio_common_entry_t *)tgt_data.req_pkt(prm->tgt->ha);
481
482         if (prm->tgt->tgt_enable_64bit_addr)
483                 prm->pkt->entry_type = CTIO_A64_TYPE;
484         else
485                 prm->pkt->entry_type = CONTINUE_TGT_IO_TYPE;
486
487         prm->pkt->entry_count = (uint8_t) prm->req_cnt;
488
489         h = q2t_make_handle(prm->tgt->ha);
490         if (h != Q2T_NULL_HANDLE) {
491                 prm->tgt->ha->cmds[h] = prm->cmd;
492         }
493         prm->pkt->handle = h | CTIO_COMPLETION_HANDLE_MARK;
494
495         timeout = Q2T_TIMEOUT;
496         prm->pkt->timeout = cpu_to_le16(timeout);
497
498         /* Set initiator ID */
499         h = GET_TARGET_ID(prm->tgt->ha, &prm->cmd->atio);
500         SET_TARGET_ID(prm->tgt->ha, prm->pkt->target, h);
501
502         prm->pkt->exchange_id = prm->cmd->atio.exchange_id;
503
504         TRACE(TRACE_DEBUG|TRACE_SCSI,
505               "handle(scst_cmd) -> %08x, timeout %d L %#x -> I %#x E %#x",
506               prm->pkt->handle, timeout, le16_to_cpu(prm->cmd->atio.lun),
507               GET_TARGET_ID(prm->tgt->ha, prm->pkt),
508               le16_to_cpu(prm->pkt->exchange_id));
509
510 }
511
512 static void q2t_load_data_segments(struct q2t_prm *prm)
513 {
514         uint32_t cnt;
515         uint32_t *dword_ptr;
516         int enable_64bit_addressing = prm->tgt->tgt_enable_64bit_addr;
517
518         TRACE_DBG("iocb->scsi_status=%x, iocb->flags=%x",
519               le16_to_cpu(prm->pkt->scsi_status), le16_to_cpu(prm->pkt->flags));
520
521         prm->pkt->transfer_length = cpu_to_le32(prm->bufflen);
522
523         /* Setup packet address segment pointer */
524         dword_ptr = prm->pkt->dseg_0_address;
525
526         if (prm->seg_cnt == 0) {
527                 /* No data transfer */
528                 *dword_ptr++ = 0;
529                 *dword_ptr = 0;
530
531                 TRACE_BUFFER("No data, CTIO packet data",
532                              prm->pkt, REQUEST_ENTRY_SIZE);
533                 goto out;
534         }
535
536         /* Set total data segment count */
537         prm->pkt->dseg_count = cpu_to_le16(prm->seg_cnt);
538
539         /* If scatter gather */
540         TRACE_SG("%s", "Building S/G data segments...");
541         /* Load command entry data segments */
542         for (cnt = 0;
543              (cnt < prm->tgt->datasegs_per_cmd) && prm->seg_cnt;
544              cnt++, prm->seg_cnt--)
545         {
546                 *dword_ptr++ =
547                     cpu_to_le32(pci_dma_lo32(sg_dma_address(prm->sg)));
548                 if (enable_64bit_addressing) {
549                         *dword_ptr++ =
550                             cpu_to_le32(pci_dma_hi32
551                                         (sg_dma_address(prm->sg)));
552                 }
553                 *dword_ptr++ = cpu_to_le32(sg_dma_len(prm->sg));
554
555                 TRACE_SG("S/G Segment phys_addr=%llx:%llx, len=%d",
556                       (long long unsigned int)pci_dma_hi32(sg_dma_address(prm->sg)),
557                       (long long unsigned int)pci_dma_lo32(sg_dma_address(prm->sg)),
558                       (int)sg_dma_len(prm->sg));
559
560                 prm->sg++;
561         }
562
563         TRACE_BUFFER("Scatter/gather, CTIO packet data",
564                      prm->pkt, REQUEST_ENTRY_SIZE);
565
566         /* Build continuation packets */
567         while (prm->seg_cnt > 0) {
568                 cont_a64_entry_t *cont_pkt64 =
569                         (cont_a64_entry_t *)tgt_data.req_cont_pkt(prm->tgt->ha);
570
571                 /*
572                  * Make sure that from cont_pkt64 none of
573                  * 64-bit specific fields used for 32-bit
574                  * addressing. Cast to (cont_entry_t*) for
575                  * that.
576                  */
577
578                 memset(cont_pkt64, 0, sizeof(*cont_pkt64));
579
580                 cont_pkt64->entry_count = 1;
581                 cont_pkt64->sys_define = 0;
582
583                 if (enable_64bit_addressing) {
584                         cont_pkt64->entry_type = CONTINUE_A64_TYPE;
585                         dword_ptr =
586                             (uint32_t*)&cont_pkt64->dseg_0_address;
587                 } else {
588                         cont_pkt64->entry_type = CONTINUE_TYPE;
589                         dword_ptr =
590                             (uint32_t*)&((cont_entry_t *)
591                                             cont_pkt64)->dseg_0_address;
592                 }
593
594                 /* Load continuation entry data segments */
595                 for (cnt = 0;
596                      cnt < prm->tgt->datasegs_per_cont && prm->seg_cnt;
597                      cnt++, prm->seg_cnt--)
598                 {
599                         *dword_ptr++ =
600                             cpu_to_le32(pci_dma_lo32
601                                         (sg_dma_address(prm->sg)));
602                         if (enable_64bit_addressing) {
603                                 *dword_ptr++ =
604                                     cpu_to_le32(pci_dma_hi32
605                                                 (sg_dma_address
606                                                  (prm->sg)));
607                         }
608                         *dword_ptr++ = cpu_to_le32(sg_dma_len(prm->sg));
609
610                         TRACE_SG("S/G Segment Cont. phys_addr=%llx:%llx, len=%d",
611                               (long long unsigned int)pci_dma_hi32(sg_dma_address(prm->sg)),
612                               (long long unsigned int)pci_dma_lo32(sg_dma_address(prm->sg)),
613                               (int)sg_dma_len(prm->sg));
614
615                         prm->sg++;
616                 }
617
618                 TRACE_BUFFER("Continuation packet data",
619                              cont_pkt64, REQUEST_ENTRY_SIZE);
620         }
621
622 out:
623         return;
624 }
625
626 static void q2t_init_ctio_ret_entry(ctio_ret_entry_t *ctio_m1,
627         struct q2t_prm *prm)
628 {
629         TRACE_ENTRY();
630
631         prm->sense_buffer_len = min((uint32_t)prm->sense_buffer_len,
632                                     (uint32_t)sizeof(ctio_m1->sense_data));
633
634         ctio_m1->flags = __constant_cpu_to_le16(OF_SSTS | OF_FAST_POST |
635                                                 OF_NO_DATA | OF_SS_MODE_1);
636         ctio_m1->flags |= __constant_cpu_to_le16(OF_INC_RC);
637         ctio_m1->scsi_status = cpu_to_le16(prm->rq_result);
638         ctio_m1->residual = cpu_to_le32(prm->residual);
639         if (SCST_SENSE_VALID(prm->sense_buffer)) {
640                 ctio_m1->scsi_status |=
641                                 __constant_cpu_to_le16(SS_SENSE_LEN_VALID);
642                 ctio_m1->sense_length = cpu_to_le16(prm->sense_buffer_len);
643                 memcpy(ctio_m1->sense_data, prm->sense_buffer,
644                        prm->sense_buffer_len);
645         } else {
646                 memset(ctio_m1->sense_data, 0, sizeof(ctio_m1->sense_data));
647                 ctio_m1->sense_length = 0;
648         }
649
650         TRACE_BUFFER("CTIO returned packet data", ctio_m1, REQUEST_ENTRY_SIZE);
651
652         /* Sense with len > 26, is it possible ??? */
653
654         TRACE_EXIT();
655         return;
656 }
657
658 static inline int q2t_has_data(struct scst_cmd *scst_cmd)
659 {
660         return scst_cmd_get_resp_data_len(scst_cmd) > 0;
661 }
662
663 static int q2t_xmit_response(struct scst_cmd *scst_cmd)
664 {
665         int res = SCST_TGT_RES_SUCCESS;
666         struct q2t_sess *sess;
667         int is_send_status;
668         unsigned long flags = 0;
669         struct q2t_prm prm;
670         int data_sense_flag = 0;
671         uint16_t full_req_cnt;
672
673         TRACE_ENTRY();
674         TRACE(TRACE_SCSI, "tag=%lld", scst_cmd_get_tag(scst_cmd));
675
676 #ifdef CONFIG_QLA_TGT_DEBUG_WORK_IN_THREAD
677         if (scst_cmd_atomic(scst_cmd))
678                 return SCST_TGT_RES_NEED_THREAD_CTX;
679 #endif
680
681         memset(&prm, 0, sizeof(prm));
682
683         prm.cmd = (struct q2t_cmd *)scst_cmd_get_tgt_priv(scst_cmd);
684         sess = (struct q2t_sess *)
685                 scst_sess_get_tgt_priv(scst_cmd_get_session(scst_cmd));
686
687         if (unlikely(scst_cmd_aborted(scst_cmd))) {
688                 scsi_qla_host_t *ha = sess->tgt->ha;
689
690                 TRACE(TRACE_MGMT_MINOR, "qla2x00tgt(%ld): terminating exchange "
691                         "for aborted scst_cmd=%p (tag=%lld)",
692                         ha->instance, scst_cmd, scst_cmd_get_tag(scst_cmd));
693
694                 scst_set_delivery_status(scst_cmd, SCST_CMD_DELIVERY_ABORTED);
695
696                 prm.cmd->state = Q2T_STATE_ABORTED;
697
698                 q2t_send_term_exchange(ha, prm.cmd, &prm.cmd->atio, 0);
699                 /* !! At this point cmd could be already freed !! */
700                 goto out;
701         }
702
703         prm.sg = scst_cmd_get_sg(scst_cmd);
704         prm.bufflen = scst_cmd_get_resp_data_len(scst_cmd);
705         prm.sg_cnt = scst_cmd_get_sg_cnt(scst_cmd);
706         prm.data_direction = scst_cmd_get_data_direction(scst_cmd);
707         prm.rq_result = scst_cmd_get_status(scst_cmd);
708         prm.sense_buffer = scst_cmd_get_sense_buffer(scst_cmd);
709         prm.sense_buffer_len = scst_cmd_get_sense_buffer_len(scst_cmd);
710         prm.tgt = sess->tgt;
711         prm.seg_cnt = 0;
712         prm.req_cnt = 1;
713         is_send_status = scst_cmd_get_is_send_status(scst_cmd);
714
715         TRACE_DBG("rq_result=%x, is_send_status=%x", prm.rq_result,
716                 is_send_status);
717
718         if (prm.rq_result != 0)
719                 TRACE_BUFFER("Sense", prm.sense_buffer, prm.sense_buffer_len);
720
721         if (!is_send_status) {
722                 /* ToDo, after it's done in SCST */
723                 PRINT_ERROR("qla2x00tgt(%ld): is_send_status not set: "
724                      "feature not implemented", prm.tgt->ha->instance);
725                 res = SCST_TGT_RES_FATAL_ERROR;
726                 goto out;
727         }
728
729         /* Acquire ring specific lock */
730         spin_lock_irqsave(&prm.tgt->ha->hardware_lock, flags);
731
732         /* Send marker if required */
733         if (tgt_data.issue_marker(prm.tgt->ha) != QLA_SUCCESS) {
734                 PRINT_ERROR("qla2x00tgt(%ld): __QLA2X00_MARKER() "
735                             "failed", prm.tgt->ha->instance);
736                 res = SCST_TGT_RES_FATAL_ERROR;
737                 goto out_unlock;
738         }
739
740         TRACE_DBG("CTIO start: ha(%d)", (int) prm.tgt->ha->instance);
741
742         if (q2t_has_data(scst_cmd)) {
743                 if (q2t_pci_map_calc_cnt(&prm) != 0) {
744                         res = SCST_TGT_RES_QUEUE_FULL;
745                         goto out_unlock;
746                 }
747                 full_req_cnt = prm.req_cnt;
748                 if (SCST_SENSE_VALID(prm.sense_buffer)) {
749                         data_sense_flag = 1;
750                         full_req_cnt++;
751                 }
752         } else
753                 full_req_cnt = prm.req_cnt;
754
755         q2t_build_ctio_pkt(&prm);
756
757         if (prm.data_direction != SCST_DATA_WRITE) {
758                 prm.residual =
759                     le32_to_cpu(prm.cmd->atio.data_length) - prm.bufflen;
760                 if (prm.residual > 0) {
761                         TRACE_DBG("Residual underflow: %d", prm.residual);
762                         prm.rq_result |= SS_RESIDUAL_UNDER;
763                 } else if (prm.residual < 0) {
764                         TRACE_DBG("Residual overflow: %d", prm.residual);
765                         prm.rq_result |= SS_RESIDUAL_OVER;
766                         prm.residual = -prm.residual;
767                 }
768
769                 if (q2t_has_data(scst_cmd)) {
770                         prm.pkt->flags |= __constant_cpu_to_le16(
771                                 OF_FAST_POST | OF_INC_RC | OF_DATA_IN);
772
773                         q2t_load_data_segments(&prm);
774
775                         if (data_sense_flag == 0) {
776                                 prm.pkt->scsi_status = cpu_to_le16(
777                                         prm.rq_result);
778                                 prm.pkt->residual = cpu_to_le32(prm.residual);
779                                 prm.pkt->flags |=
780                                         __constant_cpu_to_le16(OF_SSTS);
781                         } else {
782                                 ctio_ret_entry_t *ctio_m1 =
783                                         (ctio_ret_entry_t *)
784                                         tgt_data.req_cont_pkt(prm.tgt->ha);
785
786                                 TRACE_DBG("%s", "Building additional status "
787                                         "packet");
788
789                                 memcpy(ctio_m1, prm.pkt, sizeof(*ctio_m1));
790                                 ctio_m1->entry_count = 1;
791
792                                 /* Real finish is ctio_m1's finish */
793                                 prm.pkt->handle = Q2T_SKIP_HANDLE |
794                                                 CTIO_COMPLETION_HANDLE_MARK;
795
796                                 prm.pkt->flags &= ~__constant_cpu_to_le16(OF_INC_RC);
797
798                                 q2t_init_ctio_ret_entry(ctio_m1, &prm);
799                                 TRACE_BUFFER("Status CTIO packet data", ctio_m1,
800                                         REQUEST_ENTRY_SIZE);
801                         }
802                 } else
803                         q2t_init_ctio_ret_entry((ctio_ret_entry_t *)prm.pkt, &prm);
804         } else {
805                 q2t_init_ctio_ret_entry((ctio_ret_entry_t *)prm.pkt, &prm);
806         }
807
808         prm.cmd->state = Q2T_STATE_PROCESSED;   /* Mid-level is done processing */
809
810         TRACE_BUFFER("Xmitting", prm.pkt, REQUEST_ENTRY_SIZE);
811
812         q2t_exec_queue(prm.tgt->ha);
813
814 out_unlock:
815         /* Release ring specific lock */
816         spin_unlock_irqrestore(&prm.tgt->ha->hardware_lock, flags);
817
818 out:
819         TRACE_EXIT_RES(res);
820         return res;
821 }
822
823 static int q2t_rdy_to_xfer(struct scst_cmd *scst_cmd)
824 {
825         int res = SCST_TGT_RES_SUCCESS;
826         struct q2t_sess *sess;
827         unsigned long flags = 0;
828         struct q2t_prm prm;
829
830         TRACE_ENTRY();
831         TRACE(TRACE_SCSI, "tag=%lld", scst_cmd_get_tag(scst_cmd));
832
833 #ifdef CONFIG_QLA_TGT_DEBUG_WORK_IN_THREAD
834         if (scst_cmd_atomic(scst_cmd))
835                 return SCST_TGT_RES_NEED_THREAD_CTX;
836 #endif
837
838         memset(&prm, 0, sizeof(prm));
839
840         prm.cmd = (struct q2t_cmd *)scst_cmd_get_tgt_priv(scst_cmd);
841         sess = (struct q2t_sess *)
842                 scst_sess_get_tgt_priv(scst_cmd_get_session(scst_cmd));
843
844         prm.sg = scst_cmd_get_sg(scst_cmd);
845         prm.bufflen = scst_cmd_get_bufflen(scst_cmd);
846         prm.sg_cnt = scst_cmd_get_sg_cnt(scst_cmd);
847         prm.data_direction = scst_cmd_get_data_direction(scst_cmd);
848         prm.tgt = sess->tgt;
849         prm.req_cnt = 1;
850
851         /* Acquire ring specific lock */
852         spin_lock_irqsave(&prm.tgt->ha->hardware_lock, flags);
853
854         /* Send marker if required */
855         if (tgt_data.issue_marker(prm.tgt->ha) != QLA_SUCCESS) {
856                 PRINT_ERROR("qla2x00tgt(%ld): __QLA2X00_MARKER() "
857                             "failed", prm.tgt->ha->instance);
858                 res = SCST_TGT_RES_FATAL_ERROR;
859                 goto out_unlock;
860         }
861
862         TRACE_DBG("CTIO_start: ha(%d)", (int) prm.tgt->ha->instance);
863
864         /* Calculate number of entries and segments required */
865         if (q2t_pci_map_calc_cnt(&prm) != 0) {
866                 res = SCST_TGT_RES_QUEUE_FULL;
867                 goto out_unlock;
868         }
869
870         prm.cmd->iocb_cnt = prm.req_cnt;
871
872         q2t_build_ctio_pkt(&prm);
873
874         prm.pkt->flags = __constant_cpu_to_le16(OF_FAST_POST | OF_DATA_OUT);
875
876         q2t_load_data_segments(&prm);
877
878         prm.cmd->state = Q2T_STATE_NEED_DATA;
879
880         TRACE_BUFFER("Xfering", prm.pkt, REQUEST_ENTRY_SIZE);
881
882         q2t_exec_queue(prm.tgt->ha);
883
884 out_unlock:
885         /* Release ring specific lock */
886         spin_unlock_irqrestore(&prm.tgt->ha->hardware_lock, flags);
887
888         TRACE_EXIT_RES(res);
889         return res;
890 }
891
892 static void q2t_send_term_exchange(scsi_qla_host_t *ha, struct q2t_cmd *cmd,
893         atio_entry_t *atio, int ha_locked)
894 {
895         ctio_ret_entry_t *ctio;
896         unsigned long flags = 0;
897         int do_tgt_cmd_done = 0;
898
899         TRACE_ENTRY();
900
901         TRACE_DBG("Sending TERM EXCH CTIO (ha=%p)", ha);
902
903         if (!ha_locked)
904                 spin_lock_irqsave(&ha->hardware_lock, flags);
905
906         /* Send marker if required */
907         if (tgt_data.issue_marker(ha) != QLA_SUCCESS) {
908                 PRINT_ERROR("qla2x00tgt(%ld): __QLA2X00_MARKER() "
909                             "failed", ha->instance);
910                 goto out_unlock;
911         }
912
913         ctio = (ctio_ret_entry_t *)tgt_data.req_pkt(ha);
914         if (ctio == NULL) {
915                 PRINT_ERROR("qla2x00tgt(%ld): %s failed: unable to allocate "
916                         "request packet", ha->instance, __func__);
917                 goto out_unlock;
918         }
919
920         ctio->entry_type = CTIO_RET_TYPE;
921         ctio->entry_count = 1;
922
923         if (cmd != NULL) {
924                 ctio->handle = q2t_make_handle(ha);
925                 if (ctio->handle != Q2T_NULL_HANDLE) {
926                         ha->cmds[ctio->handle] = cmd;
927                 } else {
928                         ctio->handle = Q2T_SKIP_HANDLE;
929                         do_tgt_cmd_done = 1;
930                 }
931         } else
932                 ctio->handle = Q2T_SKIP_HANDLE;
933
934         ctio->handle |= CTIO_COMPLETION_HANDLE_MARK;
935
936         SET_TARGET_ID(ha, ctio->target, GET_TARGET_ID(ha, atio));
937         ctio->exchange_id = atio->exchange_id;
938
939         /* Most likely, it isn't needed */
940         ctio->residual = atio->data_length;
941         if (ctio->residual != 0)
942                 ctio->scsi_status |= SS_RESIDUAL_UNDER;
943
944         ctio->flags = __constant_cpu_to_le16(OF_FAST_POST | OF_TERM_EXCH |
945                         OF_NO_DATA | OF_SS_MODE_1);
946         ctio->flags |= __constant_cpu_to_le16(OF_INC_RC);
947
948         TRACE_BUFFER("CTIO TERM EXCH packet data", ctio, REQUEST_ENTRY_SIZE);
949
950         q2t_exec_queue(ha);
951
952 out_unlock:
953         if (!ha_locked)
954                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
955
956         if (do_tgt_cmd_done) {
957                 if (!in_interrupt())
958                         msleep(250);
959                 scst_tgt_cmd_done(cmd->scst_cmd);
960                 /* !! At this point cmd could be already freed !! */
961         }
962
963         TRACE_EXIT();
964         return;
965 }
966
967 static inline void q2t_free_cmd(struct q2t_cmd *cmd)
968 {
969         kmem_cache_free(q2t_cmd_cachep, cmd);
970 }
971
972 static void q2t_on_free_cmd(struct scst_cmd *scst_cmd)
973 {
974         struct q2t_cmd *cmd = (struct q2t_cmd *)scst_cmd_get_tgt_priv(scst_cmd);
975
976         TRACE_ENTRY();
977         TRACE(TRACE_SCSI, "END Command tag %lld", scst_cmd_get_tag(scst_cmd));
978
979         scst_cmd_set_tgt_priv(scst_cmd, NULL);
980
981         q2t_free_cmd(cmd);
982
983         TRACE_EXIT();
984         return;
985 }
986
987 /* ha->hardware_lock supposed to be held on entry */
988 static inline struct scst_cmd *q2t_get_cmd(scsi_qla_host_t *ha, uint32_t handle)
989 {
990         if (ha->cmds[handle] != NULL) {
991                 struct scst_cmd *cmd = ha->cmds[handle]->scst_cmd;
992                 ha->cmds[handle] = NULL;
993                 return cmd;
994         } else
995                 return NULL;
996 }
997
998 /* ha->hardware_lock supposed to be held on entry */
999 static void q2t_do_ctio_completion(scsi_qla_host_t *ha,
1000                                    uint32_t handle,
1001                                    uint16_t status,
1002                                    ctio_common_entry_t *ctio)
1003 {
1004         struct scst_cmd *scst_cmd;
1005         struct q2t_cmd *cmd;
1006         uint16_t loop_id = -1;
1007         int err = 0;
1008
1009         TRACE_ENTRY();
1010
1011         if (ctio != NULL)
1012                 loop_id = GET_TARGET_ID(ha, ctio);
1013
1014         TRACE(TRACE_DEBUG|TRACE_SCSI, "handle(ctio %p status %#x) <- %08x I %x",
1015               ctio, status, handle, loop_id);
1016
1017         /* Clear out CTIO_COMPLETION_HANDLE_MARK */
1018         handle &= ~CTIO_COMPLETION_HANDLE_MARK;
1019
1020         if (status != CTIO_SUCCESS) {
1021                 err = 1;
1022                 switch (status) {
1023                 case CTIO_LIP_RESET:
1024                 case CTIO_TARGET_RESET:
1025                 case CTIO_ABORTED:
1026                 case CTIO_TIMEOUT:
1027                 case CTIO_INVALID_RX_ID:
1028                         /* they are OK */
1029                         TRACE(TRACE_MGMT_MINOR, "qla2x00tgt(%ld): CTIO with "
1030                                 "status %#x received (LIP_RESET=e, ABORTED=2, "
1031                                 "TARGET_RESET=17, TIMEOUT=b, "
1032                                 "INVALID_RX_ID=8)", ha->instance, status);
1033                         break;
1034
1035                 case CTIO_PORT_LOGGED_OUT:
1036                 case CTIO_PORT_UNAVAILABLE:
1037                         PRINT_INFO("qla2x00tgt(%ld): CTIO with PORT LOGGED "
1038                                 "OUT (29) or PORT UNAVAILABLE (28) status %x "
1039                                 "received", ha->instance, status);
1040                         break;
1041
1042                 default:
1043                         PRINT_ERROR("qla2x00tgt(%ld): CTIO with error status "
1044                                     "0x%x received", ha->instance, status);
1045                         break;
1046                 }
1047                 q2t_modify_command_count(ha, 1, 0);
1048         }
1049
1050         if (handle != Q2T_NULL_HANDLE) {
1051                 if (unlikely(handle == Q2T_SKIP_HANDLE)) {
1052                         goto out;
1053                 }
1054                 if (unlikely(handle == Q2T_BUSY_HANDLE)) {
1055                         goto out;
1056                 }
1057                 scst_cmd = q2t_get_cmd(ha, handle);
1058                 if (unlikely(scst_cmd == NULL)) {
1059                         PRINT_INFO("qla2x00tgt(%ld): Suspicious: unable to "
1060                                    "find the command with handle %x",
1061                                    ha->instance, handle);
1062                         goto out;
1063                 }
1064                 if (unlikely(err)) {
1065                         TRACE_MGMT_DBG("Found by handle failed CTIO scst_cmd "
1066                                 "%p (op %x)", scst_cmd, scst_cmd->cdb[0]);
1067                 }
1068         } else if (ctio != NULL) {
1069                 uint32_t tag = le16_to_cpu(ctio->exchange_id);
1070                 struct q2t_sess *sess = q2t_find_sess_by_lid(ha->tgt, loop_id);
1071
1072                 if (sess == NULL) {
1073                         PRINT_INFO("qla2x00tgt(%ld): Suspicious: "
1074                                    "ctio_completion for non-existing session "
1075                                    "(loop_id %d, tag %d)",
1076                                    ha->instance, loop_id, tag);
1077                         goto out;
1078                 }
1079
1080                 scst_cmd = scst_find_cmd_by_tag(sess->scst_sess, tag);
1081                 if (scst_cmd == NULL) {
1082                         PRINT_INFO("qla2x00tgt(%ld): Suspicious: unable to "
1083                              "find the command with tag %d (loop_id %d)",
1084                              ha->instance, tag, loop_id);
1085                         goto out;
1086                 }
1087                 if (unlikely(err)) {
1088                         TRACE_MGMT_DBG("Found by ctio failed CTIO scst_cmd %p "
1089                                 "(op %x)", scst_cmd, scst_cmd->cdb[0]);
1090                 }
1091
1092                 TRACE_DBG("Found scst_cmd %p", scst_cmd);
1093         } else
1094                 goto out;
1095
1096         cmd = (struct q2t_cmd *)scst_cmd_get_tgt_priv(scst_cmd);
1097         if (unlikely(err)) {
1098                 TRACE(TRACE_MGMT_MINOR, "Failed CTIO state %d (err %x)",
1099                         cmd->state, status);
1100         }
1101
1102         if (cmd->state == Q2T_STATE_PROCESSED) {
1103                 TRACE_DBG("Command %p finished", cmd);
1104                 if (q2t_has_data(scst_cmd)) {
1105                         pci_unmap_sg(ha->pdev, scst_cmd_get_sg(scst_cmd),
1106                                 scst_cmd_get_sg_cnt(scst_cmd),
1107                                 scst_to_tgt_dma_dir(
1108                                         scst_cmd_get_data_direction(scst_cmd)));
1109                 }
1110                 goto out_free;
1111         } else if (cmd->state == Q2T_STATE_NEED_DATA) {
1112                 int context = SCST_CONTEXT_TASKLET;
1113                 int rx_status = SCST_RX_STATUS_SUCCESS;
1114
1115                 cmd->state = Q2T_STATE_DATA_IN;
1116
1117                 if (status != CTIO_SUCCESS)
1118                         rx_status = SCST_RX_STATUS_ERROR;
1119
1120 #ifdef CONFIG_QLA_TGT_DEBUG_WORK_IN_THREAD
1121                 context = SCST_CONTEXT_THREAD;
1122 #endif
1123
1124                 TRACE_DBG("Data received, context %x, rx_status %d",
1125                       context, rx_status);
1126
1127                 pci_unmap_sg(ha->pdev, scst_cmd_get_sg(scst_cmd),
1128                         scst_cmd_get_sg_cnt(scst_cmd),
1129                         scst_to_tgt_dma_dir(
1130                                 scst_cmd_get_data_direction(scst_cmd)));
1131
1132                 scst_rx_data(scst_cmd, rx_status, context);
1133         } else if (cmd->state == Q2T_STATE_ABORTED) {
1134                 TRACE_MGMT_DBG("Aborted command %p finished", cmd);
1135                 goto out_free;
1136         } else {
1137                 PRINT_ERROR("qla2x00tgt(%ld): A command in state (%d) should "
1138                         "not return a CTIO complete", ha->instance, cmd->state);
1139                 goto out_free;
1140         }
1141
1142 out:
1143         TRACE_EXIT();
1144         return;
1145
1146 out_free:
1147         if (unlikely(err)) {
1148                 TRACE_MGMT_DBG("%s", "Finishing failed CTIO");
1149                 scst_set_delivery_status(scst_cmd, SCST_CMD_DELIVERY_FAILED);
1150         }
1151         scst_tgt_cmd_done(scst_cmd);
1152         goto out;
1153 }
1154
1155 /* ha->hardware_lock supposed to be held on entry */
1156 /* called via callback from qla2xxx */
1157 static void q2t_ctio_completion(scsi_qla_host_t *ha, uint32_t handle)
1158 {
1159         TRACE_ENTRY();
1160         sBUG_ON(ha == NULL);
1161
1162         if (ha->tgt != NULL) {
1163                 q2t_do_ctio_completion(ha, handle,
1164                                        CTIO_SUCCESS, NULL);
1165         } else {
1166                 TRACE_DBG("CTIO, but target mode not enabled. ha %p handle %#x",
1167                           ha, handle);
1168         }
1169         TRACE_EXIT();
1170         return;
1171 }
1172
1173 /* ha->hardware_lock supposed to be held on entry */
1174 static void q2t_send_busy(scsi_qla_host_t *ha, atio_entry_t *atio)
1175 {
1176         ctio_ret_entry_t *ctio;
1177
1178         TRACE_ENTRY();
1179
1180         ctio = (ctio_ret_entry_t *)tgt_data.req_pkt(ha);
1181         ctio->entry_type = CTIO_RET_TYPE;
1182         ctio->entry_count = 1;
1183         ctio->handle = Q2T_BUSY_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
1184         ctio->scsi_status = __constant_cpu_to_le16(BUSY << 1);
1185         ctio->residual = atio->data_length;
1186         if (ctio->residual != 0)
1187                 ctio->scsi_status |= SS_RESIDUAL_UNDER;
1188
1189         /* Set IDs */
1190         SET_TARGET_ID(ha, ctio->target, GET_TARGET_ID(ha, atio));
1191         ctio->exchange_id = atio->exchange_id;
1192
1193         ctio->flags = __constant_cpu_to_le16(OF_SSTS | OF_FAST_POST |
1194                                              OF_NO_DATA | OF_SS_MODE_1);
1195         ctio->flags |= __constant_cpu_to_le16(OF_INC_RC);
1196
1197         TRACE_BUFFER("CTIO BUSY packet data", ctio, REQUEST_ENTRY_SIZE);
1198
1199         q2t_exec_queue(ha);
1200
1201         TRACE_EXIT();
1202         return;
1203 }
1204
1205 /* ha->hardware_lock is supposed to be held on entry */
1206 static int q2t_do_send_cmd_to_scst(scsi_qla_host_t *ha, struct q2t_cmd *cmd)
1207 {
1208         int res = 0;
1209         struct q2t_sess *sess = cmd->sess;
1210         uint16_t lun;
1211         scst_data_direction dir = SCST_DATA_NONE;
1212         int context;
1213
1214         TRACE_ENTRY();
1215
1216         /* make it be in network byte order */
1217         lun = swab16(cmd->atio.lun);
1218         cmd->scst_cmd = scst_rx_cmd(sess->scst_sess, (uint8_t *)&lun,
1219                                     sizeof(lun), cmd->atio.cdb, Q2T_MAX_CDB_LEN,
1220                                     SCST_ATOMIC);
1221
1222         if (cmd->scst_cmd == NULL) {
1223                 PRINT_ERROR("qla2x00tgt(%ld): scst_rx_cmd() failed for "
1224                      "host %ld(%p)", ha->instance, ha->host_no, ha);
1225                 res = -EFAULT;
1226                 goto out;
1227         }
1228
1229         scst_cmd_set_tag(cmd->scst_cmd, le16_to_cpu(cmd->atio.exchange_id));
1230         scst_cmd_set_tgt_priv(cmd->scst_cmd, cmd);
1231
1232         if (cmd->atio.execution_codes & ATIO_EXEC_READ)
1233                 dir = SCST_DATA_READ;
1234         else if (cmd->atio.execution_codes & ATIO_EXEC_WRITE)
1235                 dir = SCST_DATA_WRITE;
1236         scst_cmd_set_expected(cmd->scst_cmd, dir,
1237                 le32_to_cpu(cmd->atio.data_length));
1238
1239         switch (cmd->atio.task_codes) {
1240         case ATIO_SIMPLE_QUEUE:
1241                 cmd->scst_cmd->queue_type = SCST_CMD_QUEUE_SIMPLE;
1242                 break;
1243         case ATIO_HEAD_OF_QUEUE:
1244                 cmd->scst_cmd->queue_type = SCST_CMD_QUEUE_HEAD_OF_QUEUE;
1245                 break;
1246         case ATIO_ORDERED_QUEUE:
1247                 cmd->scst_cmd->queue_type = SCST_CMD_QUEUE_ORDERED;
1248                 break;
1249         case ATIO_ACA_QUEUE:
1250                 cmd->scst_cmd->queue_type = SCST_CMD_QUEUE_ACA;
1251                 break;
1252         case ATIO_UNTAGGED:
1253                 cmd->scst_cmd->queue_type = SCST_CMD_QUEUE_UNTAGGED;
1254                 break;
1255         default:
1256                 PRINT_ERROR("qla2x00tgt(%ld): Unknown task code %x, use "
1257                         "ORDERED instead", ha->instance, cmd->atio.task_codes);
1258                 cmd->scst_cmd->queue_type = SCST_CMD_QUEUE_ORDERED;
1259                 break;
1260         }
1261
1262 #ifdef CONFIG_QLA_TGT_DEBUG_WORK_IN_THREAD
1263         context = SCST_CONTEXT_THREAD;
1264 #else
1265         context = SCST_CONTEXT_TASKLET;
1266 #endif
1267
1268         TRACE_DBG("Context %x", context);
1269         TRACE(TRACE_SCSI, "START Command (tag %lld)", scst_cmd_get_tag(cmd->scst_cmd));
1270         scst_cmd_init_done(cmd->scst_cmd, context);
1271
1272 out:
1273         TRACE_EXIT_RES(res);
1274         return res;
1275 }
1276
1277 /* Called in SCST's thread context */
1278 static void q2t_alloc_session_done(struct scst_session *scst_sess,
1279                                    void *data, int result)
1280 {
1281         TRACE_ENTRY();
1282
1283         if (result != 0) {
1284                 struct q2t_sess *sess = (struct q2t_sess *)data;
1285                 struct q2t_tgt *tgt = sess->tgt;
1286                 scsi_qla_host_t *ha = tgt->ha;
1287                 unsigned long flags;
1288
1289                 PRINT_INFO("qla2x00tgt(%ld): Session initialization failed",
1290                            ha->instance);
1291
1292                 spin_lock_irqsave(&ha->hardware_lock, flags);
1293                 q2t_unreg_sess(sess);
1294                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
1295         }
1296
1297         TRACE_EXIT();
1298         return;
1299 }
1300
1301 static char *q2t_find_name(scsi_qla_host_t *ha, int loop_id)
1302 {
1303         int wwn_found = 0;
1304         char *wwn_str;
1305         fc_port_t *fcl;
1306
1307         wwn_str = kmalloc(2*WWN_SIZE, GFP_ATOMIC);
1308         if (wwn_str == NULL) {
1309                 TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of wwn_str failed");
1310                 goto out;
1311         }
1312
1313         /* Find the WWN in the port db given the loop_id */
1314         list_for_each_entry_rcu(fcl, &ha->fcports, list) {
1315             if (loop_id == (fcl->loop_id & 0xFF)) {
1316                 sprintf(wwn_str, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1317                         fcl->port_name[0], fcl->port_name[1],
1318                         fcl->port_name[2], fcl->port_name[3],
1319                         fcl->port_name[4], fcl->port_name[5],
1320                         fcl->port_name[6], fcl->port_name[7]);
1321                 TRACE_DBG("found wwn: %s for loop_id: %d", wwn_str, loop_id);
1322                 wwn_found = 1;
1323                 break;
1324             }
1325         }
1326
1327         if (wwn_found == 0) {
1328                 TRACE_MGMT_DBG("qla2x00tgt(%ld): Unable to find wwn login for "
1329                         "loop id %d", ha->instance, loop_id);
1330                 kfree(wwn_str);
1331                 wwn_str = NULL;
1332         }
1333
1334 out:
1335         return wwn_str;
1336 }
1337
1338 static char *q2t_make_name(scsi_qla_host_t *ha, const uint8_t *name)
1339 {
1340         char *wwn_str;
1341
1342         wwn_str = kmalloc(3*WWN_SIZE, GFP_ATOMIC);
1343         if (wwn_str == NULL) {
1344                 TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of wwn_str failed");
1345                 goto out;
1346         }
1347         sprintf(wwn_str, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1348                 name[1], name[0], name[3], name[2], name[5], name[4],
1349                 name[7], name[6]);
1350
1351 out:
1352         return wwn_str;
1353 }
1354
1355 /* ha->hardware_lock supposed to be held on entry */
1356 static int q2t_send_cmd_to_scst(scsi_qla_host_t *ha, atio_entry_t *atio)
1357 {
1358         int res = 0;
1359         struct q2t_tgt *tgt;
1360         struct q2t_sess *sess;
1361         struct q2t_cmd *cmd;
1362         uint16_t *pn;
1363         int loop_id;
1364
1365         TRACE_ENTRY();
1366
1367         tgt = ha->tgt;
1368         loop_id = GET_TARGET_ID(ha, atio);
1369
1370         pn = (uint16_t *)(((char *)atio)+0x2a);
1371         TRACE_DBG("To SCST instance=%ld l_id=%d tag=%d wwpn=%04x%04x%04x%04x",
1372                   ha->instance, loop_id, le16_to_cpu(atio->exchange_id),
1373                   le16_to_cpu(pn[0]),
1374                   le16_to_cpu(pn[1]),
1375                   le16_to_cpu(pn[2]),
1376                   le16_to_cpu(pn[3]));
1377         /*        le64_to_cpu(*(uint64_t *)(((char *)atio)+0x2c))); */
1378         /*le32_to_cpu(*(uint32_t *)atio->initiator_port_name)); */
1379
1380         if (tgt->tgt_shutdown) {
1381                 TRACE_MGMT_DBG("New command while device %p is shutting "
1382                         "down", tgt);
1383                 res = -EFAULT;
1384                 goto out;
1385         }
1386
1387 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 17)
1388         cmd =  kmem_cache_alloc(q2t_cmd_cachep, GFP_ATOMIC);
1389 #else
1390         cmd =  kmem_cache_zalloc(q2t_cmd_cachep, GFP_ATOMIC);
1391 #endif
1392         if (cmd == NULL) {
1393                 TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of cmd failed");
1394                 res = -ENOMEM;
1395                 goto out;
1396         }
1397 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 17)
1398         memset(cmd, 0, sizeof(*cmd));
1399 #endif
1400
1401         TRACE_BUFFER("ATIO Coming Up", atio, sizeof(*atio));
1402         memcpy(&cmd->atio, atio, sizeof(*atio));
1403         cmd->state = Q2T_STATE_NEW;
1404
1405         sess = q2t_find_sess_by_lid(tgt, loop_id);
1406         if (unlikely(sess == NULL)) {
1407                 sess = kzalloc(sizeof(*sess), GFP_ATOMIC);
1408                 if (sess == NULL) {
1409                         TRACE(TRACE_OUT_OF_MEM, "%s",
1410                               "Allocation of sess failed");
1411                         res = -ENOMEM;
1412                         goto out_free_cmd;
1413                 }
1414
1415                 sess->tgt = tgt;
1416                 sess->loop_id = loop_id;
1417                 INIT_LIST_HEAD(&sess->list);
1418
1419                 /* register session (remote initiator) */
1420                 {
1421                         char *name;
1422                         if (IS_QLA2200(ha))
1423                                 name = q2t_find_name(ha, loop_id);
1424                         else {
1425                                 name = q2t_make_name(ha,
1426                                         atio->initiator_port_name);
1427                         }
1428                         if (name == NULL) {
1429                                 res = -ESRCH;
1430                                 goto out_free_sess;
1431                         }
1432
1433                         sess->scst_sess = scst_register_session(
1434                                 tgt->scst_tgt, 1, name, sess,
1435                                 q2t_alloc_session_done);
1436                         kfree(name);
1437                 }
1438
1439                 if (sess->scst_sess == NULL) {
1440                         PRINT_ERROR("qla2x00tgt(%ld): scst_register_session() failed "
1441                              "for host %ld(%p)", ha->instance, ha->host_no, ha);
1442                         res = -EFAULT;
1443                         goto out_free_sess;
1444                 }
1445                 scst_sess_set_tgt_priv(sess->scst_sess, sess);
1446
1447                 /* add session data to host data structure */
1448                 list_add(&sess->list, &tgt->sess_list);
1449                 tgt->sess_count++;
1450         }
1451
1452         cmd->sess = sess;
1453         res = q2t_do_send_cmd_to_scst(ha, cmd);
1454         if (res != 0)
1455                 goto out_free_cmd;
1456
1457 out:
1458         TRACE_EXIT_RES(res);
1459         return res;
1460
1461 out_free_sess:
1462         kfree(sess);
1463         /* go through */
1464
1465 out_free_cmd:
1466         q2t_free_cmd(cmd);
1467         goto out;
1468 }
1469
1470 /* ha->hardware_lock supposed to be held on entry */
1471 static int q2t_handle_task_mgmt(scsi_qla_host_t *ha, notify_entry_t *iocb)
1472 {
1473         int res = 0, rc = -1;
1474         struct q2t_mgmt_cmd *mcmd;
1475         struct q2t_tgt *tgt;
1476         struct q2t_sess *sess;
1477         int loop_id;
1478         uint16_t lun;
1479
1480         TRACE_ENTRY();
1481
1482         tgt = ha->tgt;
1483         loop_id = GET_TARGET_ID(ha, iocb);
1484
1485         /* Make it be in network byte order */
1486         lun = swab16(iocb->lun);
1487
1488         sess = q2t_find_sess_by_lid(tgt, loop_id);
1489         if (sess == NULL) {
1490                 TRACE(TRACE_MGMT, "qla2x00tgt(%ld): task mgmt fn 0x%x for "
1491                       "non-existant session", ha->instance, iocb->task_flags);
1492                 res = -EFAULT;
1493                 goto out;
1494         }
1495
1496         mcmd = kzalloc(sizeof(*mcmd), GFP_ATOMIC);
1497         if (mcmd == NULL) {
1498                 TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of mgmt cmd failed");
1499                 res = -ENOMEM;
1500                 goto out;
1501         }
1502
1503         mcmd->sess = sess;
1504         mcmd->notify_entry = *iocb;
1505
1506         switch (iocb->task_flags) {
1507         case IMM_NTFY_CLEAR_ACA:
1508                 TRACE(TRACE_MGMT, "%s", "IMM_NTFY_CLEAR_ACA received");
1509                 rc = scst_rx_mgmt_fn_lun(sess->scst_sess, SCST_CLEAR_ACA,
1510                                          (uint8_t *)&lun, sizeof(lun),
1511                                          SCST_ATOMIC, mcmd);
1512                 break;
1513
1514         case IMM_NTFY_TARGET_RESET:
1515                 TRACE(TRACE_MGMT, "%s", "IMM_NTFY_TARGET_RESET received");
1516                 rc = scst_rx_mgmt_fn_lun(sess->scst_sess, SCST_TARGET_RESET,
1517                                          (uint8_t *)&lun, sizeof(lun),
1518                                          SCST_ATOMIC, mcmd);
1519                 break;
1520
1521         case IMM_NTFY_LUN_RESET:
1522                 TRACE(TRACE_MGMT, "%s", "IMM_NTFY_LUN_RESET received");
1523                 rc = scst_rx_mgmt_fn_lun(sess->scst_sess, SCST_LUN_RESET,
1524                                          (uint8_t *)&lun, sizeof(lun),
1525                                          SCST_ATOMIC, mcmd);
1526                 break;
1527
1528         case IMM_NTFY_CLEAR_TS:
1529                 TRACE(TRACE_MGMT, "%s", "IMM_NTFY_CLEAR_TS received");
1530                 rc = scst_rx_mgmt_fn_lun(sess->scst_sess, SCST_CLEAR_TASK_SET,
1531                                          (uint8_t *)&lun, sizeof(lun),
1532                                          SCST_ATOMIC, mcmd);
1533                 break;
1534
1535         case IMM_NTFY_ABORT_TS:
1536                 TRACE(TRACE_MGMT, "%s", "IMM_NTFY_ABORT_TS received");
1537                 rc = scst_rx_mgmt_fn_lun(sess->scst_sess, SCST_ABORT_TASK_SET,
1538                                          (uint8_t *)&lun, sizeof(lun),
1539                                          SCST_ATOMIC, mcmd);
1540                 break;
1541
1542         default:
1543                 PRINT_ERROR("qla2x00tgt(%ld): Unknown task mgmt fn 0x%x",
1544                             ha->instance, iocb->task_flags);
1545                 break;
1546         }
1547
1548         if (rc != 0) {
1549                 PRINT_ERROR("qla2x00tgt(%ld): scst_rx_mgmt_fn_lun() failed: %d",
1550                             ha->instance, rc);
1551                 res = -EFAULT;
1552                 goto out_free;
1553         }
1554
1555 out:
1556         TRACE_EXIT_RES(res);
1557         return res;
1558
1559 out_free:
1560         kfree(mcmd);
1561         goto out;
1562 }
1563
1564 /* ha->hardware_lock supposed to be held on entry */
1565 static int q2t_abort_task(scsi_qla_host_t *ha, notify_entry_t *iocb)
1566 {
1567         int res = 0, rc;
1568         struct q2t_mgmt_cmd *mcmd;
1569         struct q2t_sess *sess;
1570         int loop_id;
1571         uint32_t tag;
1572
1573         TRACE_ENTRY();
1574
1575         loop_id = GET_TARGET_ID(ha, iocb);
1576         tag = le16_to_cpu(iocb->seq_id);
1577
1578         sess = q2t_find_sess_by_lid(ha->tgt, loop_id);
1579         if (sess == NULL) {
1580                 TRACE(TRACE_MGMT, "qla2x00tgt(%ld): task abort for unexisting "
1581                         "session", ha->instance);
1582                 res = -EFAULT;
1583                 goto out;
1584         }
1585
1586         mcmd = kzalloc(sizeof(*mcmd), GFP_ATOMIC);
1587         if (mcmd == NULL) {
1588                 TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of mgmt cmd failed");
1589                 res = -ENOMEM;
1590                 goto out;
1591         }
1592
1593         mcmd->sess = sess;
1594         mcmd->notify_entry = *iocb;
1595
1596         rc = scst_rx_mgmt_fn_tag(sess->scst_sess, SCST_ABORT_TASK, tag,
1597                 SCST_ATOMIC, mcmd);
1598         if (rc != 0) {
1599                 PRINT_ERROR("qla2x00tgt(%ld): scst_rx_mgmt_fn_tag() failed: %d",
1600                             ha->instance, rc);
1601                 res = -EFAULT;
1602                 goto out_free;
1603         }
1604
1605 out:
1606         TRACE_EXIT_RES(res);
1607         return res;
1608
1609 out_free:
1610         kfree(mcmd);
1611         goto out;
1612 }
1613
1614 /* SCST Callback */
1615 static void q2t_task_mgmt_fn_done(struct scst_mgmt_cmd *scst_mcmd)
1616 {
1617         struct q2t_mgmt_cmd *mcmd;
1618         unsigned long flags;
1619
1620         TRACE_ENTRY();
1621
1622         TRACE_MGMT_DBG("scst_mcmd (%p) status %#x state %#x", scst_mcmd,
1623                 scst_mcmd->status, scst_mcmd->state);
1624
1625         mcmd = scst_mgmt_cmd_get_tgt_priv(scst_mcmd);
1626         if (unlikely(mcmd == NULL)) {
1627                 PRINT_ERROR("scst_mcmd %p tgt_spec is NULL", mcmd);
1628                 goto out;
1629         }
1630
1631         spin_lock_irqsave(&mcmd->sess->tgt->ha->hardware_lock, flags);
1632         q2t_send_notify_ack(mcmd->sess->tgt->ha, &mcmd->notify_entry, 0,
1633                 (scst_mgmt_cmd_get_status(scst_mcmd) == SCST_MGMT_STATUS_SUCCESS)
1634                          ? 0 : FC_TM_FAILED, 1);
1635         spin_unlock_irqrestore(&mcmd->sess->tgt->ha->hardware_lock, flags);
1636
1637         /* scst_mgmt_cmd_set_tgt_priv(scst_mcmd, NULL); */
1638         scst_mcmd->tgt_priv = NULL;
1639         kfree(mcmd);
1640
1641 out:
1642         TRACE_EXIT();
1643         return;
1644 }
1645
1646 /* ha->hardware_lock supposed to be held on entry */
1647 static void q2t_handle_imm_notify(scsi_qla_host_t *ha, notify_entry_t *iocb)
1648 {
1649         uint16_t status;
1650         int loop_id;
1651         uint32_t add_flags = 0;
1652         int send_notify_ack = 1;
1653
1654         TRACE_ENTRY();
1655
1656         status = le16_to_cpu(iocb->status);
1657         loop_id = GET_TARGET_ID(ha, iocb);
1658
1659         if (!ha->flags.enable_target_mode || ha->tgt == NULL) {
1660                 TRACE(TRACE_MGMT_DEBUG|TRACE_SCSI|TRACE_DEBUG,
1661                       "Acking %04x S %04x I %#x -> L %#x", status,
1662                       le16_to_cpu(iocb->seq_id), loop_id,
1663                       le16_to_cpu(iocb->lun));
1664                 goto out;
1665         }
1666
1667         TRACE_BUFFER("IMMED Notify Coming Up", iocb, sizeof(*iocb));
1668
1669         switch (status) {
1670         case IMM_NTFY_LIP_RESET:
1671                 TRACE(TRACE_MGMT, "LIP reset (I %#x)", loop_id);
1672                 /*
1673                  * ToDo: doing so we reset all holding RESERVE'ations,
1674                  * which could be unexpected, so be more carefull here
1675                  */
1676                 q2t_clear_tgt_db(ha->tgt);
1677                 /* set the Clear LIP reset event flag */
1678                 add_flags |= NOTIFY_ACK_CLEAR_LIP_RESET;
1679                 break;
1680
1681         case IMM_NTFY_IOCB_OVERFLOW:
1682                 PRINT_ERROR("qla2x00tgt(%ld): Cannot provide requested "
1683                         "capability (IOCB overflow)", ha->instance);
1684                 break;
1685
1686         case IMM_NTFY_ABORT_TASK:
1687                 TRACE(TRACE_MGMT_MINOR, "Abort Task (S %04x I %#x -> L %#x)",
1688                       le16_to_cpu(iocb->seq_id), loop_id,
1689                       le16_to_cpu(iocb->lun));
1690                 if (q2t_abort_task(ha, iocb) == 0)
1691                         send_notify_ack = 0;
1692                 break;
1693
1694         case IMM_NTFY_PORT_LOGOUT:
1695                 TRACE(TRACE_MGMT, "Port logout (S %04x I %#x -> L %#x)",
1696                       le16_to_cpu(iocb->seq_id), loop_id,
1697                       le16_to_cpu(iocb->lun));
1698                 /*
1699                  * ToDo: doing so we reset all holding RESERVE'ations,
1700                  * which could be unexpected, so be more carefull here
1701                  */
1702                 q2t_port_logout(ha, loop_id);
1703                 break;
1704
1705         case IMM_NTFY_PORT_CONFIG:
1706         case IMM_NTFY_GLBL_TPRLO:
1707         case IMM_NTFY_GLBL_LOGO:
1708                 /* ToDo: ports DB changes handling ?? */
1709                 TRACE(TRACE_MGMT, "Port config changed, Global TPRLO or "
1710                       "Global LOGO (%d)", status);
1711                 /*
1712                  * ToDo: doing so we reset all holding RESERVE'ations,
1713                  * which could be unexpected, so be more carefull here
1714                  */
1715                 q2t_clear_tgt_db(ha->tgt);
1716                 break;
1717
1718         case IMM_NTFY_RESOURCE:
1719                 PRINT_ERROR("qla2x00tgt(%ld): Out of resources, host %ld",
1720                             ha->instance, ha->host_no);
1721                 break;
1722
1723         case IMM_NTFY_MSG_RX:
1724                 TRACE(TRACE_MGMT, "Immediate notify task %x", iocb->task_flags);
1725                 if (q2t_handle_task_mgmt(ha, iocb) == 0)
1726                         send_notify_ack = 0;
1727                 break;
1728
1729         default:
1730                 PRINT_ERROR("qla2x00tgt(%ld): Received unknown immediate "
1731                         "notify status %x", ha->instance, status);
1732                 break;
1733         }
1734
1735
1736 out:
1737         if (send_notify_ack)
1738                 q2t_send_notify_ack(ha, iocb, add_flags, 0, 0);
1739
1740         TRACE_EXIT();
1741         return;
1742 }
1743
1744 /* ha->hardware_lock supposed to be held on entry */
1745 /* called via callback from qla2xxx */
1746 static void q2t_response_pkt(scsi_qla_host_t *ha, sts_entry_t *pkt)
1747 {
1748         atio_entry_t *atio;
1749
1750         TRACE_ENTRY();
1751
1752         TRACE(TRACE_SCSI, "pkt %p: T %02x C %02x S %02x handle %#x",
1753               pkt, pkt->entry_type, pkt->entry_count, pkt->entry_status,
1754               pkt->handle);
1755
1756         if (unlikely(ha->tgt == NULL)) {
1757                 TRACE_DBG("response pkt, but no tgt. ha %p tgt_flag %d",
1758                         ha, ha->flags.enable_target_mode);
1759                 goto out;
1760         }
1761
1762         if (pkt->entry_status != 0) {
1763                 PRINT_ERROR("qla2x00tgt(%ld): Received response packet %x "
1764                      "with error status %x", ha->instance, pkt->entry_type,
1765                      pkt->entry_status);
1766                 goto out;
1767         }
1768
1769         switch (pkt->entry_type) {
1770         case ACCEPT_TGT_IO_TYPE:
1771                 if (ha->flags.enable_target_mode && ha->tgt != NULL) {
1772                         int rc;
1773                         atio = (atio_entry_t *)pkt;
1774                         TRACE_DBG("ACCEPT_TGT_IO instance %ld status %04x "
1775                                   "lun %04x read/write %d data_length %08x "
1776                                   "target_id %02x exchange_id %04x ",
1777                                   ha->instance, le16_to_cpu(atio->status),
1778                                   le16_to_cpu(atio->lun),
1779                                   atio->execution_codes,
1780                                   le32_to_cpu(atio->data_length),
1781                                   GET_TARGET_ID(ha, atio),
1782                                   le16_to_cpu(atio->exchange_id));
1783                         if (atio->status !=
1784                                 __constant_cpu_to_le16(ATIO_CDB_VALID)) {
1785                                 PRINT_ERROR("qla2x00tgt(%ld): ATIO with error "
1786                                             "status %x received", ha->instance,
1787                                             le16_to_cpu(atio->status));
1788                                 break;
1789                         }
1790                         PRINT_BUFF_FLAG(TRACE_SCSI, "CDB", atio->cdb,
1791                                         sizeof(atio->cdb));
1792                         rc = q2t_send_cmd_to_scst(ha, atio);
1793                         if (unlikely(rc != 0)) {
1794                                 if (rc == -ESRCH) {
1795 #if 1 /* With TERM EXCHANGE some FC cards refuse to boot */
1796                                         q2t_send_busy(ha, atio);
1797 #else
1798                                         q2t_send_term_exchange(ha, NULL, atio, 1);
1799 #endif
1800                                 } else {
1801                                         if (!ha->tgt->tgt_shutdown) {
1802                                                 PRINT_INFO("qla2x00tgt(%ld): Unable to "
1803                                                     "send the command to SCSI target "
1804                                                     "mid-level, sending BUSY status",
1805                                                     ha->instance);
1806                                         }
1807                                         q2t_send_busy(ha, atio);
1808                                 }
1809                         }
1810                 } else if (!ha->tgt->tgt_shutdown) {
1811                         PRINT_ERROR("qla2x00tgt(%ld): ATIO, but target mode "
1812                                 "disabled", ha->instance);
1813                 }
1814                 break;
1815
1816         case CONTINUE_TGT_IO_TYPE:
1817                 if (ha->flags.enable_target_mode && ha->tgt != NULL) {
1818                         ctio_common_entry_t *entry = (ctio_common_entry_t *)pkt;
1819                         TRACE_DBG("CONTINUE_TGT_IO: instance %ld",
1820                                   ha->instance);
1821                         q2t_do_ctio_completion(ha, entry->handle,
1822                                                le16_to_cpu(entry->status),
1823                                                entry);
1824                 } else if (!ha->tgt->tgt_shutdown) {
1825                         PRINT_ERROR("qla2x00tgt(%ld): CTIO, but target mode "
1826                                 "disabled", ha->instance);
1827                 }
1828                 break;
1829
1830         case CTIO_A64_TYPE:
1831                 if (ha->flags.enable_target_mode && ha->tgt != NULL) {
1832                         ctio_common_entry_t *entry = (ctio_common_entry_t *)pkt;
1833                         TRACE_DBG("CTIO_A64: instance %ld", ha->instance);
1834                         q2t_do_ctio_completion(ha, entry->handle,
1835                                                le16_to_cpu(entry->status),
1836                                                entry);
1837                 } else if (!ha->tgt->tgt_shutdown) {
1838                         PRINT_ERROR("qla2x00tgt(%ld): CTIO_A64, but target "
1839                                 "mode disabled", ha->instance);
1840                 }
1841                 break;
1842
1843         case IMMED_NOTIFY_TYPE:
1844                 TRACE_DBG("%s", "IMMED_NOTIFY");
1845                 q2t_handle_imm_notify(ha, (notify_entry_t *)pkt);
1846                 break;
1847
1848         case NOTIFY_ACK_TYPE:
1849                 if (ha->tgt == NULL) {
1850                         PRINT_ERROR("qla2x00tgt(%ld): NOTIFY_ACK recieved "
1851                                 "with NULL tgt", ha->instance);
1852                 } else if (ha->tgt->notify_ack_expected > 0) {
1853                         nack_entry_t *entry = (nack_entry_t *)pkt;
1854                         TRACE_DBG("NOTIFY_ACK seq %04x status %x",
1855                                   le16_to_cpu(entry->seq_id),
1856                                   le16_to_cpu(entry->status));
1857                         ha->tgt->notify_ack_expected--;
1858                         if (entry->status !=
1859                                 __constant_cpu_to_le16(NOTIFY_ACK_SUCCESS)) {
1860                                 PRINT_ERROR("qla2x00tgt(%ld): NOTIFY_ACK "
1861                                             "failed %x", ha->instance,
1862                                             le16_to_cpu(entry->status));
1863                         }
1864                 } else {
1865                         PRINT_ERROR("qla2x00tgt(%ld): Unexpected NOTIFY_ACK "
1866                                     "received", ha->instance);
1867                 }
1868                 break;
1869
1870         case MODIFY_LUN_TYPE:
1871                 if ((ha->tgt != NULL) && (ha->tgt->modify_lun_expected > 0)) {
1872                         struct q2t_tgt *tgt = ha->tgt;
1873                         modify_lun_entry_t *entry = (modify_lun_entry_t *)pkt;
1874                         TRACE_DBG("MODIFY_LUN %x, imm %c%d, cmd %c%d",
1875                                   entry->status,
1876                                   (entry->operators & MODIFY_LUN_IMM_ADD) ?'+'
1877                                   :(entry->operators & MODIFY_LUN_IMM_SUB) ?'-'
1878                                   :' ',
1879                                   entry->immed_notify_count,
1880                                   (entry->operators & MODIFY_LUN_CMD_ADD) ?'+'
1881                                   :(entry->operators & MODIFY_LUN_CMD_SUB) ?'-'
1882                                   :' ',
1883                                   entry->command_count);
1884                         tgt->modify_lun_expected--;
1885                         if (entry->status != MODIFY_LUN_SUCCESS) {
1886                                 PRINT_ERROR("qla2x00tgt(%ld): MODIFY_LUN "
1887                                             "failed %x", ha->instance,
1888                                             entry->status);
1889                         }
1890                         tgt->disable_lun_status = entry->status;
1891                 } else {
1892                         PRINT_ERROR("qla2x00tgt(%ld): Unexpected MODIFY_LUN "
1893                                     "received", (ha != NULL) ?ha->instance :-1);
1894                 }
1895                 break;
1896
1897         case ENABLE_LUN_TYPE:
1898                 if (ha->tgt != NULL) {
1899                         struct q2t_tgt *tgt = ha->tgt;
1900                         elun_entry_t *entry = (elun_entry_t *)pkt;
1901                         TRACE_DBG("ENABLE_LUN %x imm %u cmd %u ",
1902                                   entry->status, entry->immed_notify_count,
1903                                   entry->command_count);
1904                         if ((ha->flags.enable_target_mode) &&
1905                             (entry->status == ENABLE_LUN_ALREADY_ENABLED)) {
1906                                 TRACE_DBG("LUN is already enabled: %#x",
1907                                           entry->status);
1908                                 entry->status = ENABLE_LUN_SUCCESS;
1909                         } else if (entry->status == ENABLE_LUN_RC_NONZERO) {
1910                                 TRACE_DBG("ENABLE_LUN succeeded, but with "
1911                                         "error: %#x", entry->status);
1912                                 entry->status = ENABLE_LUN_SUCCESS;
1913                         } else if (entry->status != ENABLE_LUN_SUCCESS) {
1914                                 PRINT_ERROR("qla2x00tgt(%ld): ENABLE_LUN "
1915                                             "failed %x",
1916                                             ha->instance, entry->status);
1917                                 ha->flags.enable_target_mode =
1918                                         ~ha->flags.enable_target_mode;
1919                         } /* else success */
1920                         tgt->disable_lun_status = entry->status;
1921                 }
1922                 break;
1923
1924         default:
1925                 PRINT_INFO("qla2x00tgt(%ld): Received unknown response pkt "
1926                      "type %x", ha->instance, pkt->entry_type);
1927                 break;
1928         }
1929
1930 out:
1931         TRACE_EXIT();
1932         return;
1933 }
1934
1935 /* ha->hardware_lock supposed to be held on entry */
1936 /* called via callback from qla2xxx */
1937 static void q2t_async_event(uint16_t code, scsi_qla_host_t *ha, uint16_t *mailbox)
1938 {
1939         TRACE_ENTRY();
1940
1941         sBUG_ON(ha == NULL);
1942
1943         if (unlikely(ha->tgt == NULL)) {
1944                 TRACE(TRACE_DEBUG|TRACE_MGMT,
1945                       "ASYNC EVENT %#x, but no tgt. ha %p tgt_flag %d",
1946                       code, ha, ha->flags.enable_target_mode);
1947                 goto out;
1948         }
1949
1950         switch (code) {
1951         case MBA_RESET:                 /* Reset */
1952         case MBA_SYSTEM_ERR:            /* System Error */
1953         case MBA_REQ_TRANSFER_ERR:      /* Request Transfer Error */
1954         case MBA_RSP_TRANSFER_ERR:      /* Response Transfer Error */
1955         case MBA_LOOP_DOWN:
1956         case MBA_LIP_OCCURRED:          /* Loop Initialization Procedure */
1957         case MBA_LIP_RESET:             /* LIP reset occurred */
1958         case MBA_POINT_TO_POINT:        /* Point to point mode. */
1959         case MBA_CHG_IN_CONNECTION:     /* Change in connection mode. */
1960                 TRACE_MGMT_DBG("Async event %#x occured: clear tgt_db", code);
1961 #if 0
1962                 /*
1963                  * ToDo: doing so we reset all holding RESERVE'ations,
1964                  * which could be unexpected, so be more carefull here
1965                  */
1966                 q2t_clear_tgt_db(ha->tgt);
1967 #endif
1968                 break;
1969         case MBA_RSCN_UPDATE:
1970                 TRACE_MGMT_DBG("RSCN Update (%x) N_Port %#06x (fmt %x)", code,
1971                         ((mailbox[1] & 0xFF) << 16) | le16_to_cpu(mailbox[2]),
1972                         (mailbox[1] & 0xFF00) >> 8);
1973                 break;
1974
1975         case MBA_PORT_UPDATE:           /* Port database update occurred */
1976                 TRACE_MGMT_DBG("Port DB Chng: L_ID %#4x did %d: ignore",
1977                       le16_to_cpu(mailbox[1]), le16_to_cpu(mailbox[2]));
1978                 break;
1979
1980         case MBA_LOOP_UP:
1981         default:
1982                 TRACE_MGMT_DBG("Async event %#x occured: ignore", code);
1983                 /* just don't DO anything */
1984                 break;
1985         }
1986
1987 out:
1988         TRACE_EXIT();
1989         return;
1990 }
1991
1992 static int q2t_get_target_name(scsi_qla_host_t *ha, char **wwn)
1993 {
1994         const int wwn_len = 3*WWN_SIZE+2;
1995         int res = 0;
1996         char *name;
1997
1998         name = kmalloc(wwn_len, GFP_KERNEL);
1999         if (name == NULL) {
2000                 TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of tgt name failed");
2001                 res = -ENOMEM;
2002                 goto out;
2003         }
2004
2005         sprintf(name, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
2006                 ha->port_name[0], ha->port_name[1],
2007                 ha->port_name[2], ha->port_name[3],
2008                 ha->port_name[4], ha->port_name[5],
2009                 ha->port_name[6], ha->port_name[7]);
2010
2011         *wwn = name;
2012
2013 out:
2014         return res;
2015 }
2016
2017 /* no lock held on entry */
2018 /* called via callback from qla2xxx */
2019 static void q2t_host_action(scsi_qla_host_t *ha,
2020                             qla2x_tgt_host_action_t action)
2021 {
2022         struct q2t_tgt *tgt = NULL;
2023         unsigned long flags = 0;
2024
2025
2026         TRACE_ENTRY();
2027
2028         sBUG_ON(ha == NULL);
2029
2030         switch (action) {
2031         case ENABLE_TARGET_MODE:
2032         {
2033                 char *wwn;
2034                 int sg_tablesize;
2035
2036                 tgt = kzalloc(sizeof(*tgt), GFP_KERNEL);
2037                 if (tgt == NULL) {
2038                         TRACE(TRACE_OUT_OF_MEM, "%s",
2039                               "Allocation of tgt failed");
2040                         goto out;
2041                 }
2042
2043                 tgt->ha = ha;
2044                 tgt->disable_lun_status = Q2T_DISABLE_LUN_STATUS_NOT_SET;
2045                 INIT_LIST_HEAD(&tgt->sess_list);
2046                 init_waitqueue_head(&tgt->waitQ);
2047
2048                 if (ha->flags.enable_64bit_addressing) {
2049                         PRINT_INFO("qla2x00tgt(%ld): 64 Bit PCI "
2050                                    "Addressing Enabled", ha->instance);
2051                         tgt->tgt_enable_64bit_addr = 1;
2052                         /* 3 is reserved */
2053                         sg_tablesize =
2054                                 QLA_MAX_SG64(ha->request_q_length - 3);
2055                         tgt->datasegs_per_cmd = DATASEGS_PER_COMMAND64;
2056                         tgt->datasegs_per_cont = DATASEGS_PER_CONT64;
2057                 } else {
2058                         PRINT_INFO("qla2x00tgt(%ld): Using 32 Bit "
2059                                    "PCI Addressing", ha->instance);
2060                         sg_tablesize =
2061                                 QLA_MAX_SG32(ha->request_q_length - 3);
2062                         tgt->datasegs_per_cmd = DATASEGS_PER_COMMAND32;
2063                         tgt->datasegs_per_cont = DATASEGS_PER_CONT32;
2064                 }
2065
2066                 if (q2t_get_target_name(ha, &wwn) != 0) {
2067                         kfree(tgt);
2068                         goto out;
2069                 }
2070
2071                 tgt->scst_tgt = scst_register(&tgt_template, wwn);
2072                 kfree(wwn);
2073                 if (!tgt->scst_tgt) {
2074                         PRINT_ERROR("qla2x00tgt(%ld): scst_register() "
2075                                     "failed for host %ld(%p)", ha->instance,
2076                                     ha->host_no, ha);
2077                         kfree(tgt);
2078                         goto out;
2079                 }
2080
2081                 scst_tgt_set_sg_tablesize(tgt->scst_tgt, sg_tablesize);
2082                 scst_tgt_set_tgt_priv(tgt->scst_tgt, tgt);
2083
2084                 spin_lock_irqsave(&ha->hardware_lock, flags);
2085                 ha->tgt = tgt;
2086                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
2087
2088                 TRACE_DBG("Enable lun for host %ld(%ld,%p)",
2089                           ha->host_no, ha->instance, ha);
2090                 tgt_data.enable_lun(ha);
2091
2092                 break;
2093         }
2094         case DISABLE_TARGET_MODE:
2095                 spin_lock_irqsave(&ha->hardware_lock, flags);
2096                 if (ha->tgt == NULL) {
2097                         /* ensure target mode is marked as off */
2098                         ha->flags.enable_target_mode = 0;
2099                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2100
2101                         if(!ha->flags.host_shutting_down)
2102                                 tgt_data.disable_lun(ha);
2103
2104                         goto out;
2105                 }
2106
2107                 tgt = ha->tgt;
2108                 ha->tgt = NULL; /* ensure no one gets in behind us */
2109                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
2110
2111                 TRACE_DBG("Shutting down host %ld(%ld,%p)",
2112                           ha->host_no, ha->instance, ha);
2113                 scst_unregister(tgt->scst_tgt);
2114                 /*
2115                  * Free of tgt happens via callback q2t_target_release
2116                  * called from scst_unregister, so we shouldn't touch it again
2117                  */
2118                 tgt = NULL;
2119                 break;
2120
2121         default:
2122                 PRINT_ERROR("Unknown action %d", action);
2123                 break;
2124         }
2125
2126 out:
2127         TRACE_EXIT();
2128         return;
2129 }
2130
2131 #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
2132
2133 #define Q2T_PROC_LOG_ENTRY_NAME     "trace_level"
2134
2135 #include <linux/proc_fs.h>
2136
2137 static int q2t_log_info_show(struct seq_file *seq, void *v)
2138 {
2139         int res = 0;
2140
2141         TRACE_ENTRY();
2142
2143         res = scst_proc_log_entry_read(seq, trace_flag, NULL);
2144
2145         TRACE_EXIT_RES(res);
2146         return res;
2147 }
2148
2149 static ssize_t q2t_proc_log_entry_write(struct file *file,
2150         const char __user *buf, size_t length, loff_t *off)
2151 {
2152         int res = 0;
2153
2154         TRACE_ENTRY();
2155
2156         res = scst_proc_log_entry_write(file, buf, length, &trace_flag,
2157                 Q2T_DEFAULT_LOG_FLAGS, NULL);
2158
2159         TRACE_EXIT_RES(res);
2160         return res;
2161 }
2162
2163 static struct scst_proc_data q2t_log_proc_data = {
2164         SCST_DEF_RW_SEQ_OP(q2t_proc_log_entry_write)
2165         .show = q2t_log_info_show,
2166 };
2167 #endif
2168
2169 static int q2t_proc_log_entry_build(struct scst_tgt_template *templ)
2170 {
2171         int res = 0;
2172 #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
2173         struct proc_dir_entry *p, *root;
2174
2175         TRACE_ENTRY();
2176
2177         root = scst_proc_get_tgt_root(templ);
2178         if (root) {
2179                 /* create the proc file entry for the device */
2180                 q2t_log_proc_data.data = (void *)templ->name;
2181                 p = scst_create_proc_entry(root, Q2T_PROC_LOG_ENTRY_NAME,
2182                                         &q2t_log_proc_data);
2183                 if (p == NULL) {
2184                         PRINT_ERROR("Not enough memory to register "
2185                              "target driver %s entry %s in /proc",
2186                               templ->name, Q2T_PROC_LOG_ENTRY_NAME);
2187                         res = -ENOMEM;
2188                         goto out;
2189                 }
2190         }
2191
2192 out:
2193
2194         TRACE_EXIT_RES(res);
2195 #endif
2196         return res;
2197 }
2198
2199 static void q2t_proc_log_entry_clean(struct scst_tgt_template *templ)
2200 {
2201 #if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
2202         struct proc_dir_entry *root;
2203
2204         TRACE_ENTRY();
2205
2206         root = scst_proc_get_tgt_root(templ);
2207         if (root) {
2208                 remove_proc_entry(Q2T_PROC_LOG_ENTRY_NAME, root);
2209         }
2210
2211         TRACE_EXIT();
2212 #endif
2213         return;
2214 }
2215
2216 static int __init q2t_init(void)
2217 {
2218         int res = 0;
2219
2220         TRACE_ENTRY();
2221
2222         PRINT_INFO("Initializing QLogic Fibre Channel HBA Driver target mode "
2223                 "addon version %s", Q2T_VERSION_STRING);
2224
2225         q2t_cmd_cachep = KMEM_CACHE(q2t_cmd, SCST_SLAB_FLAGS);
2226         if (q2t_cmd_cachep == NULL) {
2227                 res = -ENOMEM;
2228                 goto out;
2229         }
2230
2231         res = scst_register_target_template(&tgt_template);
2232         if (res < 0)
2233                 goto out_free_kmem;
2234
2235         /*
2236          * qla2xxx_tgt_register_driver() happens in q2t_target_detect
2237          * called via scst_register_target_template()
2238          */
2239
2240         res = q2t_proc_log_entry_build(&tgt_template);
2241         if (res < 0)
2242                 goto out_unreg_target;
2243
2244 out:
2245         TRACE_EXIT();
2246         return res;
2247
2248 out_unreg_target:
2249         scst_unregister_target_template(&tgt_template);
2250
2251 out_free_kmem:
2252         kmem_cache_destroy(q2t_cmd_cachep);
2253
2254         qla2xxx_tgt_unregister_driver();
2255         goto out;
2256 }
2257
2258 static void __exit q2t_exit(void)
2259 {
2260         TRACE_ENTRY();
2261
2262         q2t_proc_log_entry_clean(&tgt_template);
2263
2264         scst_unregister_target_template(&tgt_template);
2265
2266         qla2xxx_tgt_unregister_driver();
2267
2268         kmem_cache_destroy(q2t_cmd_cachep);
2269
2270         TRACE_EXIT();
2271         return;
2272 }
2273
2274 module_init(q2t_init);
2275 module_exit(q2t_exit);
2276
2277 MODULE_AUTHOR("Vladislav Bolkhovitin & Leonid Stoljar & Nathaniel Clark");
2278 MODULE_DESCRIPTION("Target mode logic for qla2xxx");
2279 MODULE_LICENSE("GPL");
2280 MODULE_VERSION(Q2T_VERSION_STRING);