Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[~shefty/rdma-dev.git] / drivers / scsi / qla2xxx / qla_target.c
1 /*
2  *  qla_target.c SCSI LLD infrastructure for QLogic 22xx/23xx/24xx/25xx
3  *
4  *  based on qla2x00t.c code:
5  *
6  *  Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <vst@vlnb.net>
7  *  Copyright (C) 2004 - 2005 Leonid Stoljar
8  *  Copyright (C) 2006 Nathaniel Clark <nate@misrule.us>
9  *  Copyright (C) 2006 - 2010 ID7 Ltd.
10  *
11  *  Forward port and refactoring to modern qla2xxx and target/configfs
12  *
13  *  Copyright (C) 2010-2011 Nicholas A. Bellinger <nab@kernel.org>
14  *
15  *  This program is free software; you can redistribute it and/or
16  *  modify it under the terms of the GNU General Public License
17  *  as published by the Free Software Foundation, version 2
18  *  of the License.
19  *
20  *  This program is distributed in the hope that it will be useful,
21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23  *  GNU General Public License for more details.
24  */
25
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <linux/blkdev.h>
30 #include <linux/interrupt.h>
31 #include <linux/pci.h>
32 #include <linux/delay.h>
33 #include <linux/list.h>
34 #include <linux/workqueue.h>
35 #include <asm/unaligned.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_host.h>
38 #include <scsi/scsi_tcq.h>
39 #include <target/target_core_base.h>
40 #include <target/target_core_fabric.h>
41
42 #include "qla_def.h"
43 #include "qla_target.h"
44
45 static char *qlini_mode = QLA2XXX_INI_MODE_STR_ENABLED;
46 module_param(qlini_mode, charp, S_IRUGO);
47 MODULE_PARM_DESC(qlini_mode,
48         "Determines when initiator mode will be enabled. Possible values: "
49         "\"exclusive\" - initiator mode will be enabled on load, "
50         "disabled on enabling target mode and then on disabling target mode "
51         "enabled back; "
52         "\"disabled\" - initiator mode will never be enabled; "
53         "\"enabled\" (default) - initiator mode will always stay enabled.");
54
55 static int ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;
56
57 /*
58  * From scsi/fc/fc_fcp.h
59  */
60 enum fcp_resp_rsp_codes {
61         FCP_TMF_CMPL = 0,
62         FCP_DATA_LEN_INVALID = 1,
63         FCP_CMND_FIELDS_INVALID = 2,
64         FCP_DATA_PARAM_MISMATCH = 3,
65         FCP_TMF_REJECTED = 4,
66         FCP_TMF_FAILED = 5,
67         FCP_TMF_INVALID_LUN = 9,
68 };
69
70 /*
71  * fc_pri_ta from scsi/fc/fc_fcp.h
72  */
73 #define FCP_PTA_SIMPLE      0   /* simple task attribute */
74 #define FCP_PTA_HEADQ       1   /* head of queue task attribute */
75 #define FCP_PTA_ORDERED     2   /* ordered task attribute */
76 #define FCP_PTA_ACA         4   /* auto. contingent allegiance */
77 #define FCP_PTA_MASK        7   /* mask for task attribute field */
78 #define FCP_PRI_SHIFT       3   /* priority field starts in bit 3 */
79 #define FCP_PRI_RESVD_MASK  0x80        /* reserved bits in priority field */
80
81 /*
82  * This driver calls qla2x00_alloc_iocbs() and qla2x00_issue_marker(), which
83  * must be called under HW lock and could unlock/lock it inside.
84  * It isn't an issue, since in the current implementation on the time when
85  * those functions are called:
86  *
87  *   - Either context is IRQ and only IRQ handler can modify HW data,
88  *     including rings related fields,
89  *
90  *   - Or access to target mode variables from struct qla_tgt doesn't
91  *     cross those functions boundaries, except tgt_stop, which
92  *     additionally protected by irq_cmd_count.
93  */
94 /* Predefs for callbacks handed to qla2xxx LLD */
95 static void qlt_24xx_atio_pkt(struct scsi_qla_host *ha,
96         struct atio_from_isp *pkt);
97 static void qlt_response_pkt(struct scsi_qla_host *ha, response_t *pkt);
98 static int qlt_issue_task_mgmt(struct qla_tgt_sess *sess, uint32_t lun,
99         int fn, void *iocb, int flags);
100 static void qlt_send_term_exchange(struct scsi_qla_host *ha, struct qla_tgt_cmd
101         *cmd, struct atio_from_isp *atio, int ha_locked);
102 static void qlt_reject_free_srr_imm(struct scsi_qla_host *ha,
103         struct qla_tgt_srr_imm *imm, int ha_lock);
104 /*
105  * Global Variables
106  */
107 static struct kmem_cache *qla_tgt_cmd_cachep;
108 static struct kmem_cache *qla_tgt_mgmt_cmd_cachep;
109 static mempool_t *qla_tgt_mgmt_cmd_mempool;
110 static struct workqueue_struct *qla_tgt_wq;
111 static DEFINE_MUTEX(qla_tgt_mutex);
112 static LIST_HEAD(qla_tgt_glist);
113
114 /* ha->hardware_lock supposed to be held on entry (to protect tgt->sess_list) */
115 static struct qla_tgt_sess *qlt_find_sess_by_port_name(
116         struct qla_tgt *tgt,
117         const uint8_t *port_name)
118 {
119         struct qla_tgt_sess *sess;
120
121         list_for_each_entry(sess, &tgt->sess_list, sess_list_entry) {
122                 if (!memcmp(sess->port_name, port_name, WWN_SIZE))
123                         return sess;
124         }
125
126         return NULL;
127 }
128
129 /* Might release hw lock, then reaquire!! */
130 static inline int qlt_issue_marker(struct scsi_qla_host *vha, int vha_locked)
131 {
132         /* Send marker if required */
133         if (unlikely(vha->marker_needed != 0)) {
134                 int rc = qla2x00_issue_marker(vha, vha_locked);
135                 if (rc != QLA_SUCCESS) {
136                         ql_dbg(ql_dbg_tgt, vha, 0xe03d,
137                             "qla_target(%d): issue_marker() failed\n",
138                             vha->vp_idx);
139                 }
140                 return rc;
141         }
142         return QLA_SUCCESS;
143 }
144
145 static inline
146 struct scsi_qla_host *qlt_find_host_by_d_id(struct scsi_qla_host *vha,
147         uint8_t *d_id)
148 {
149         struct qla_hw_data *ha = vha->hw;
150         uint8_t vp_idx;
151
152         if ((vha->d_id.b.area != d_id[1]) || (vha->d_id.b.domain != d_id[0]))
153                 return NULL;
154
155         if (vha->d_id.b.al_pa == d_id[2])
156                 return vha;
157
158         BUG_ON(ha->tgt.tgt_vp_map == NULL);
159         vp_idx = ha->tgt.tgt_vp_map[d_id[2]].idx;
160         if (likely(test_bit(vp_idx, ha->vp_idx_map)))
161                 return ha->tgt.tgt_vp_map[vp_idx].vha;
162
163         return NULL;
164 }
165
166 static inline
167 struct scsi_qla_host *qlt_find_host_by_vp_idx(struct scsi_qla_host *vha,
168         uint16_t vp_idx)
169 {
170         struct qla_hw_data *ha = vha->hw;
171
172         if (vha->vp_idx == vp_idx)
173                 return vha;
174
175         BUG_ON(ha->tgt.tgt_vp_map == NULL);
176         if (likely(test_bit(vp_idx, ha->vp_idx_map)))
177                 return ha->tgt.tgt_vp_map[vp_idx].vha;
178
179         return NULL;
180 }
181
182 void qlt_24xx_atio_pkt_all_vps(struct scsi_qla_host *vha,
183         struct atio_from_isp *atio)
184 {
185         switch (atio->u.raw.entry_type) {
186         case ATIO_TYPE7:
187         {
188                 struct scsi_qla_host *host = qlt_find_host_by_d_id(vha,
189                     atio->u.isp24.fcp_hdr.d_id);
190                 if (unlikely(NULL == host)) {
191                         ql_dbg(ql_dbg_tgt, vha, 0xe03e,
192                             "qla_target(%d): Received ATIO_TYPE7 "
193                             "with unknown d_id %x:%x:%x\n", vha->vp_idx,
194                             atio->u.isp24.fcp_hdr.d_id[0],
195                             atio->u.isp24.fcp_hdr.d_id[1],
196                             atio->u.isp24.fcp_hdr.d_id[2]);
197                         break;
198                 }
199                 qlt_24xx_atio_pkt(host, atio);
200                 break;
201         }
202
203         case IMMED_NOTIFY_TYPE:
204         {
205                 struct scsi_qla_host *host = vha;
206                 struct imm_ntfy_from_isp *entry =
207                     (struct imm_ntfy_from_isp *)atio;
208
209                 if ((entry->u.isp24.vp_index != 0xFF) &&
210                     (entry->u.isp24.nport_handle != 0xFFFF)) {
211                         host = qlt_find_host_by_vp_idx(vha,
212                             entry->u.isp24.vp_index);
213                         if (unlikely(!host)) {
214                                 ql_dbg(ql_dbg_tgt, vha, 0xe03f,
215                                     "qla_target(%d): Received "
216                                     "ATIO (IMMED_NOTIFY_TYPE) "
217                                     "with unknown vp_index %d\n",
218                                     vha->vp_idx, entry->u.isp24.vp_index);
219                                 break;
220                         }
221                 }
222                 qlt_24xx_atio_pkt(host, atio);
223                 break;
224         }
225
226         default:
227                 ql_dbg(ql_dbg_tgt, vha, 0xe040,
228                     "qla_target(%d): Received unknown ATIO atio "
229                     "type %x\n", vha->vp_idx, atio->u.raw.entry_type);
230                 break;
231         }
232
233         return;
234 }
235
236 void qlt_response_pkt_all_vps(struct scsi_qla_host *vha, response_t *pkt)
237 {
238         switch (pkt->entry_type) {
239         case CTIO_TYPE7:
240         {
241                 struct ctio7_from_24xx *entry = (struct ctio7_from_24xx *)pkt;
242                 struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
243                     entry->vp_index);
244                 if (unlikely(!host)) {
245                         ql_dbg(ql_dbg_tgt, vha, 0xe041,
246                             "qla_target(%d): Response pkt (CTIO_TYPE7) "
247                             "received, with unknown vp_index %d\n",
248                             vha->vp_idx, entry->vp_index);
249                         break;
250                 }
251                 qlt_response_pkt(host, pkt);
252                 break;
253         }
254
255         case IMMED_NOTIFY_TYPE:
256         {
257                 struct scsi_qla_host *host = vha;
258                 struct imm_ntfy_from_isp *entry =
259                     (struct imm_ntfy_from_isp *)pkt;
260
261                 host = qlt_find_host_by_vp_idx(vha, entry->u.isp24.vp_index);
262                 if (unlikely(!host)) {
263                         ql_dbg(ql_dbg_tgt, vha, 0xe042,
264                             "qla_target(%d): Response pkt (IMMED_NOTIFY_TYPE) "
265                             "received, with unknown vp_index %d\n",
266                             vha->vp_idx, entry->u.isp24.vp_index);
267                         break;
268                 }
269                 qlt_response_pkt(host, pkt);
270                 break;
271         }
272
273         case NOTIFY_ACK_TYPE:
274         {
275                 struct scsi_qla_host *host = vha;
276                 struct nack_to_isp *entry = (struct nack_to_isp *)pkt;
277
278                 if (0xFF != entry->u.isp24.vp_index) {
279                         host = qlt_find_host_by_vp_idx(vha,
280                             entry->u.isp24.vp_index);
281                         if (unlikely(!host)) {
282                                 ql_dbg(ql_dbg_tgt, vha, 0xe043,
283                                     "qla_target(%d): Response "
284                                     "pkt (NOTIFY_ACK_TYPE) "
285                                     "received, with unknown "
286                                     "vp_index %d\n", vha->vp_idx,
287                                     entry->u.isp24.vp_index);
288                                 break;
289                         }
290                 }
291                 qlt_response_pkt(host, pkt);
292                 break;
293         }
294
295         case ABTS_RECV_24XX:
296         {
297                 struct abts_recv_from_24xx *entry =
298                     (struct abts_recv_from_24xx *)pkt;
299                 struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
300                     entry->vp_index);
301                 if (unlikely(!host)) {
302                         ql_dbg(ql_dbg_tgt, vha, 0xe044,
303                             "qla_target(%d): Response pkt "
304                             "(ABTS_RECV_24XX) received, with unknown "
305                             "vp_index %d\n", vha->vp_idx, entry->vp_index);
306                         break;
307                 }
308                 qlt_response_pkt(host, pkt);
309                 break;
310         }
311
312         case ABTS_RESP_24XX:
313         {
314                 struct abts_resp_to_24xx *entry =
315                     (struct abts_resp_to_24xx *)pkt;
316                 struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
317                     entry->vp_index);
318                 if (unlikely(!host)) {
319                         ql_dbg(ql_dbg_tgt, vha, 0xe045,
320                             "qla_target(%d): Response pkt "
321                             "(ABTS_RECV_24XX) received, with unknown "
322                             "vp_index %d\n", vha->vp_idx, entry->vp_index);
323                         break;
324                 }
325                 qlt_response_pkt(host, pkt);
326                 break;
327         }
328
329         default:
330                 qlt_response_pkt(vha, pkt);
331                 break;
332         }
333
334 }
335
336 static void qlt_free_session_done(struct work_struct *work)
337 {
338         struct qla_tgt_sess *sess = container_of(work, struct qla_tgt_sess,
339             free_work);
340         struct qla_tgt *tgt = sess->tgt;
341         struct scsi_qla_host *vha = sess->vha;
342         struct qla_hw_data *ha = vha->hw;
343
344         BUG_ON(!tgt);
345         /*
346          * Release the target session for FC Nexus from fabric module code.
347          */
348         if (sess->se_sess != NULL)
349                 ha->tgt.tgt_ops->free_session(sess);
350
351         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf001,
352             "Unregistration of sess %p finished\n", sess);
353
354         kfree(sess);
355         /*
356          * We need to protect against race, when tgt is freed before or
357          * inside wake_up()
358          */
359         tgt->sess_count--;
360         if (tgt->sess_count == 0)
361                 wake_up_all(&tgt->waitQ);
362 }
363
364 /* ha->hardware_lock supposed to be held on entry */
365 void qlt_unreg_sess(struct qla_tgt_sess *sess)
366 {
367         struct scsi_qla_host *vha = sess->vha;
368
369         vha->hw->tgt.tgt_ops->clear_nacl_from_fcport_map(sess);
370
371         list_del(&sess->sess_list_entry);
372         if (sess->deleted)
373                 list_del(&sess->del_list_entry);
374
375         INIT_WORK(&sess->free_work, qlt_free_session_done);
376         schedule_work(&sess->free_work);
377 }
378 EXPORT_SYMBOL(qlt_unreg_sess);
379
380 /* ha->hardware_lock supposed to be held on entry */
381 static int qlt_reset(struct scsi_qla_host *vha, void *iocb, int mcmd)
382 {
383         struct qla_hw_data *ha = vha->hw;
384         struct qla_tgt_sess *sess = NULL;
385         uint32_t unpacked_lun, lun = 0;
386         uint16_t loop_id;
387         int res = 0;
388         struct imm_ntfy_from_isp *n = (struct imm_ntfy_from_isp *)iocb;
389         struct atio_from_isp *a = (struct atio_from_isp *)iocb;
390
391         loop_id = le16_to_cpu(n->u.isp24.nport_handle);
392         if (loop_id == 0xFFFF) {
393 #if 0 /* FIXME: Re-enable Global event handling.. */
394                 /* Global event */
395                 atomic_inc(&ha->tgt.qla_tgt->tgt_global_resets_count);
396                 qlt_clear_tgt_db(ha->tgt.qla_tgt, 1);
397                 if (!list_empty(&ha->tgt.qla_tgt->sess_list)) {
398                         sess = list_entry(ha->tgt.qla_tgt->sess_list.next,
399                             typeof(*sess), sess_list_entry);
400                         switch (mcmd) {
401                         case QLA_TGT_NEXUS_LOSS_SESS:
402                                 mcmd = QLA_TGT_NEXUS_LOSS;
403                                 break;
404                         case QLA_TGT_ABORT_ALL_SESS:
405                                 mcmd = QLA_TGT_ABORT_ALL;
406                                 break;
407                         case QLA_TGT_NEXUS_LOSS:
408                         case QLA_TGT_ABORT_ALL:
409                                 break;
410                         default:
411                                 ql_dbg(ql_dbg_tgt, vha, 0xe046,
412                                     "qla_target(%d): Not allowed "
413                                     "command %x in %s", vha->vp_idx,
414                                     mcmd, __func__);
415                                 sess = NULL;
416                                 break;
417                         }
418                 } else
419                         sess = NULL;
420 #endif
421         } else {
422                 sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
423         }
424
425         ql_dbg(ql_dbg_tgt, vha, 0xe000,
426             "Using sess for qla_tgt_reset: %p\n", sess);
427         if (!sess) {
428                 res = -ESRCH;
429                 return res;
430         }
431
432         ql_dbg(ql_dbg_tgt, vha, 0xe047,
433             "scsi(%ld): resetting (session %p from port "
434             "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x, "
435             "mcmd %x, loop_id %d)\n", vha->host_no, sess,
436             sess->port_name[0], sess->port_name[1],
437             sess->port_name[2], sess->port_name[3],
438             sess->port_name[4], sess->port_name[5],
439             sess->port_name[6], sess->port_name[7],
440             mcmd, loop_id);
441
442         lun = a->u.isp24.fcp_cmnd.lun;
443         unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
444
445         return qlt_issue_task_mgmt(sess, unpacked_lun, mcmd,
446             iocb, QLA24XX_MGMT_SEND_NACK);
447 }
448
449 /* ha->hardware_lock supposed to be held on entry */
450 static void qlt_schedule_sess_for_deletion(struct qla_tgt_sess *sess,
451         bool immediate)
452 {
453         struct qla_tgt *tgt = sess->tgt;
454         uint32_t dev_loss_tmo = tgt->ha->port_down_retry_count + 5;
455
456         if (sess->deleted)
457                 return;
458
459         ql_dbg(ql_dbg_tgt, sess->vha, 0xe001,
460             "Scheduling sess %p for deletion\n", sess);
461         list_add_tail(&sess->del_list_entry, &tgt->del_sess_list);
462         sess->deleted = 1;
463
464         if (immediate)
465                 dev_loss_tmo = 0;
466
467         sess->expires = jiffies + dev_loss_tmo * HZ;
468
469         ql_dbg(ql_dbg_tgt, sess->vha, 0xe048,
470             "qla_target(%d): session for port %02x:%02x:%02x:"
471             "%02x:%02x:%02x:%02x:%02x (loop ID %d) scheduled for "
472             "deletion in %u secs (expires: %lu) immed: %d\n",
473             sess->vha->vp_idx,
474             sess->port_name[0], sess->port_name[1],
475             sess->port_name[2], sess->port_name[3],
476             sess->port_name[4], sess->port_name[5],
477             sess->port_name[6], sess->port_name[7],
478             sess->loop_id, dev_loss_tmo, sess->expires, immediate);
479
480         if (immediate)
481                 schedule_delayed_work(&tgt->sess_del_work, 0);
482         else
483                 schedule_delayed_work(&tgt->sess_del_work,
484                     jiffies - sess->expires);
485 }
486
487 /* ha->hardware_lock supposed to be held on entry */
488 static void qlt_clear_tgt_db(struct qla_tgt *tgt, bool local_only)
489 {
490         struct qla_tgt_sess *sess;
491
492         list_for_each_entry(sess, &tgt->sess_list, sess_list_entry)
493                 qlt_schedule_sess_for_deletion(sess, true);
494
495         /* At this point tgt could be already dead */
496 }
497
498 static int qla24xx_get_loop_id(struct scsi_qla_host *vha, const uint8_t *s_id,
499         uint16_t *loop_id)
500 {
501         struct qla_hw_data *ha = vha->hw;
502         dma_addr_t gid_list_dma;
503         struct gid_list_info *gid_list;
504         char *id_iter;
505         int res, rc, i;
506         uint16_t entries;
507
508         gid_list = dma_alloc_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
509             &gid_list_dma, GFP_KERNEL);
510         if (!gid_list) {
511                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf044,
512                     "qla_target(%d): DMA Alloc failed of %u\n",
513                     vha->vp_idx, qla2x00_gid_list_size(ha));
514                 return -ENOMEM;
515         }
516
517         /* Get list of logged in devices */
518         rc = qla2x00_get_id_list(vha, gid_list, gid_list_dma, &entries);
519         if (rc != QLA_SUCCESS) {
520                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf045,
521                     "qla_target(%d): get_id_list() failed: %x\n",
522                     vha->vp_idx, rc);
523                 res = -1;
524                 goto out_free_id_list;
525         }
526
527         id_iter = (char *)gid_list;
528         res = -1;
529         for (i = 0; i < entries; i++) {
530                 struct gid_list_info *gid = (struct gid_list_info *)id_iter;
531                 if ((gid->al_pa == s_id[2]) &&
532                     (gid->area == s_id[1]) &&
533                     (gid->domain == s_id[0])) {
534                         *loop_id = le16_to_cpu(gid->loop_id);
535                         res = 0;
536                         break;
537                 }
538                 id_iter += ha->gid_list_info_size;
539         }
540
541 out_free_id_list:
542         dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
543             gid_list, gid_list_dma);
544         return res;
545 }
546
547 static bool qlt_check_fcport_exist(struct scsi_qla_host *vha,
548         struct qla_tgt_sess *sess)
549 {
550         struct qla_hw_data *ha = vha->hw;
551         struct qla_port_24xx_data *pmap24;
552         bool res, found = false;
553         int rc, i;
554         uint16_t loop_id = 0xFFFF; /* to eliminate compiler's warning */
555         uint16_t entries;
556         void *pmap;
557         int pmap_len;
558         fc_port_t *fcport;
559         int global_resets;
560         unsigned long flags;
561
562 retry:
563         global_resets = atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count);
564
565         rc = qla2x00_get_node_name_list(vha, &pmap, &pmap_len);
566         if (rc != QLA_SUCCESS) {
567                 res = false;
568                 goto out;
569         }
570
571         pmap24 = pmap;
572         entries = pmap_len/sizeof(*pmap24);
573
574         for (i = 0; i < entries; ++i) {
575                 if (!memcmp(sess->port_name, pmap24[i].port_name, WWN_SIZE)) {
576                         loop_id = le16_to_cpu(pmap24[i].loop_id);
577                         found = true;
578                         break;
579                 }
580         }
581
582         kfree(pmap);
583
584         if (!found) {
585                 res = false;
586                 goto out;
587         }
588
589         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf046,
590             "qlt_check_fcport_exist(): loop_id %d", loop_id);
591
592         fcport = kzalloc(sizeof(*fcport), GFP_KERNEL);
593         if (fcport == NULL) {
594                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf047,
595                     "qla_target(%d): Allocation of tmp FC port failed",
596                     vha->vp_idx);
597                 res = false;
598                 goto out;
599         }
600
601         fcport->loop_id = loop_id;
602
603         rc = qla2x00_get_port_database(vha, fcport, 0);
604         if (rc != QLA_SUCCESS) {
605                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf048,
606                     "qla_target(%d): Failed to retrieve fcport "
607                     "information -- get_port_database() returned %x "
608                     "(loop_id=0x%04x)", vha->vp_idx, rc, loop_id);
609                 res = false;
610                 goto out_free_fcport;
611         }
612
613         if (global_resets !=
614             atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count)) {
615                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf002,
616                     "qla_target(%d): global reset during session discovery"
617                     " (counter was %d, new %d), retrying",
618                     vha->vp_idx, global_resets,
619                     atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count));
620                 goto retry;
621         }
622
623         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf003,
624             "Updating sess %p s_id %x:%x:%x, loop_id %d) to d_id %x:%x:%x, "
625             "loop_id %d", sess, sess->s_id.b.domain, sess->s_id.b.al_pa,
626             sess->s_id.b.area, sess->loop_id, fcport->d_id.b.domain,
627             fcport->d_id.b.al_pa, fcport->d_id.b.area, fcport->loop_id);
628
629         spin_lock_irqsave(&ha->hardware_lock, flags);
630         ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
631                                 (fcport->flags & FCF_CONF_COMP_SUPPORTED));
632         spin_unlock_irqrestore(&ha->hardware_lock, flags);
633
634         res = true;
635
636 out_free_fcport:
637         kfree(fcport);
638
639 out:
640         return res;
641 }
642
643 /* ha->hardware_lock supposed to be held on entry */
644 static void qlt_undelete_sess(struct qla_tgt_sess *sess)
645 {
646         BUG_ON(!sess->deleted);
647
648         list_del(&sess->del_list_entry);
649         sess->deleted = 0;
650 }
651
652 static void qlt_del_sess_work_fn(struct delayed_work *work)
653 {
654         struct qla_tgt *tgt = container_of(work, struct qla_tgt,
655             sess_del_work);
656         struct scsi_qla_host *vha = tgt->vha;
657         struct qla_hw_data *ha = vha->hw;
658         struct qla_tgt_sess *sess;
659         unsigned long flags;
660
661         spin_lock_irqsave(&ha->hardware_lock, flags);
662         while (!list_empty(&tgt->del_sess_list)) {
663                 sess = list_entry(tgt->del_sess_list.next, typeof(*sess),
664                     del_list_entry);
665                 if (time_after_eq(jiffies, sess->expires)) {
666                         bool cancel;
667
668                         qlt_undelete_sess(sess);
669
670                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
671                         cancel = qlt_check_fcport_exist(vha, sess);
672
673                         if (cancel) {
674                                 if (sess->deleted) {
675                                         /*
676                                          * sess was again deleted while we were
677                                          * discovering it
678                                          */
679                                         spin_lock_irqsave(&ha->hardware_lock,
680                                             flags);
681                                         continue;
682                                 }
683
684                                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf049,
685                                     "qla_target(%d): cancel deletion of "
686                                     "session for port %02x:%02x:%02x:%02x:%02x:"
687                                     "%02x:%02x:%02x (loop ID %d), because "
688                                     " it isn't deleted by firmware",
689                                     vha->vp_idx, sess->port_name[0],
690                                     sess->port_name[1], sess->port_name[2],
691                                     sess->port_name[3], sess->port_name[4],
692                                     sess->port_name[5], sess->port_name[6],
693                                     sess->port_name[7], sess->loop_id);
694                         } else {
695                                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf004,
696                                     "Timeout: sess %p about to be deleted\n",
697                                     sess);
698                                 ha->tgt.tgt_ops->shutdown_sess(sess);
699                                 ha->tgt.tgt_ops->put_sess(sess);
700                         }
701
702                         spin_lock_irqsave(&ha->hardware_lock, flags);
703                 } else {
704                         schedule_delayed_work(&tgt->sess_del_work,
705                             jiffies - sess->expires);
706                         break;
707                 }
708         }
709         spin_unlock_irqrestore(&ha->hardware_lock, flags);
710 }
711
712 /*
713  * Adds an extra ref to allow to drop hw lock after adding sess to the list.
714  * Caller must put it.
715  */
716 static struct qla_tgt_sess *qlt_create_sess(
717         struct scsi_qla_host *vha,
718         fc_port_t *fcport,
719         bool local)
720 {
721         struct qla_hw_data *ha = vha->hw;
722         struct qla_tgt_sess *sess;
723         unsigned long flags;
724         unsigned char be_sid[3];
725
726         /* Check to avoid double sessions */
727         spin_lock_irqsave(&ha->hardware_lock, flags);
728         list_for_each_entry(sess, &ha->tgt.qla_tgt->sess_list,
729                                 sess_list_entry) {
730                 if (!memcmp(sess->port_name, fcport->port_name, WWN_SIZE)) {
731                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf005,
732                             "Double sess %p found (s_id %x:%x:%x, "
733                             "loop_id %d), updating to d_id %x:%x:%x, "
734                             "loop_id %d", sess, sess->s_id.b.domain,
735                             sess->s_id.b.al_pa, sess->s_id.b.area,
736                             sess->loop_id, fcport->d_id.b.domain,
737                             fcport->d_id.b.al_pa, fcport->d_id.b.area,
738                             fcport->loop_id);
739
740                         if (sess->deleted)
741                                 qlt_undelete_sess(sess);
742
743                         kref_get(&sess->se_sess->sess_kref);
744                         ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
745                                                 (fcport->flags & FCF_CONF_COMP_SUPPORTED));
746
747                         if (sess->local && !local)
748                                 sess->local = 0;
749                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
750
751                         return sess;
752                 }
753         }
754         spin_unlock_irqrestore(&ha->hardware_lock, flags);
755
756         sess = kzalloc(sizeof(*sess), GFP_KERNEL);
757         if (!sess) {
758                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04a,
759                     "qla_target(%u): session allocation failed, "
760                     "all commands from port %02x:%02x:%02x:%02x:"
761                     "%02x:%02x:%02x:%02x will be refused", vha->vp_idx,
762                     fcport->port_name[0], fcport->port_name[1],
763                     fcport->port_name[2], fcport->port_name[3],
764                     fcport->port_name[4], fcport->port_name[5],
765                     fcport->port_name[6], fcport->port_name[7]);
766
767                 return NULL;
768         }
769         sess->tgt = ha->tgt.qla_tgt;
770         sess->vha = vha;
771         sess->s_id = fcport->d_id;
772         sess->loop_id = fcport->loop_id;
773         sess->local = local;
774
775         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf006,
776             "Adding sess %p to tgt %p via ->check_initiator_node_acl()\n",
777             sess, ha->tgt.qla_tgt);
778
779         be_sid[0] = sess->s_id.b.domain;
780         be_sid[1] = sess->s_id.b.area;
781         be_sid[2] = sess->s_id.b.al_pa;
782         /*
783          * Determine if this fc_port->port_name is allowed to access
784          * target mode using explict NodeACLs+MappedLUNs, or using
785          * TPG demo mode.  If this is successful a target mode FC nexus
786          * is created.
787          */
788         if (ha->tgt.tgt_ops->check_initiator_node_acl(vha,
789             &fcport->port_name[0], sess, &be_sid[0], fcport->loop_id) < 0) {
790                 kfree(sess);
791                 return NULL;
792         }
793         /*
794          * Take an extra reference to ->sess_kref here to handle qla_tgt_sess
795          * access across ->hardware_lock reaquire.
796          */
797         kref_get(&sess->se_sess->sess_kref);
798
799         sess->conf_compl_supported = (fcport->flags & FCF_CONF_COMP_SUPPORTED);
800         BUILD_BUG_ON(sizeof(sess->port_name) != sizeof(fcport->port_name));
801         memcpy(sess->port_name, fcport->port_name, sizeof(sess->port_name));
802
803         spin_lock_irqsave(&ha->hardware_lock, flags);
804         list_add_tail(&sess->sess_list_entry, &ha->tgt.qla_tgt->sess_list);
805         ha->tgt.qla_tgt->sess_count++;
806         spin_unlock_irqrestore(&ha->hardware_lock, flags);
807
808         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04b,
809             "qla_target(%d): %ssession for wwn %02x:%02x:%02x:%02x:"
810             "%02x:%02x:%02x:%02x (loop_id %d, s_id %x:%x:%x, confirmed"
811             " completion %ssupported) added\n",
812             vha->vp_idx, local ?  "local " : "", fcport->port_name[0],
813             fcport->port_name[1], fcport->port_name[2], fcport->port_name[3],
814             fcport->port_name[4], fcport->port_name[5], fcport->port_name[6],
815             fcport->port_name[7], fcport->loop_id, sess->s_id.b.domain,
816             sess->s_id.b.area, sess->s_id.b.al_pa, sess->conf_compl_supported ?
817             "" : "not ");
818
819         return sess;
820 }
821
822 /*
823  * Called from drivers/scsi/qla2xxx/qla_init.c:qla2x00_reg_remote_port()
824  */
825 void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
826 {
827         struct qla_hw_data *ha = vha->hw;
828         struct qla_tgt *tgt = ha->tgt.qla_tgt;
829         struct qla_tgt_sess *sess;
830         unsigned long flags;
831
832         if (!vha->hw->tgt.tgt_ops)
833                 return;
834
835         if (!tgt || (fcport->port_type != FCT_INITIATOR))
836                 return;
837
838         spin_lock_irqsave(&ha->hardware_lock, flags);
839         if (tgt->tgt_stop) {
840                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
841                 return;
842         }
843         sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
844         if (!sess) {
845                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
846
847                 mutex_lock(&ha->tgt.tgt_mutex);
848                 sess = qlt_create_sess(vha, fcport, false);
849                 mutex_unlock(&ha->tgt.tgt_mutex);
850
851                 spin_lock_irqsave(&ha->hardware_lock, flags);
852         } else {
853                 kref_get(&sess->se_sess->sess_kref);
854
855                 if (sess->deleted) {
856                         qlt_undelete_sess(sess);
857
858                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04c,
859                             "qla_target(%u): %ssession for port %02x:"
860                             "%02x:%02x:%02x:%02x:%02x:%02x:%02x (loop ID %d) "
861                             "reappeared\n", vha->vp_idx, sess->local ? "local "
862                             : "", sess->port_name[0], sess->port_name[1],
863                             sess->port_name[2], sess->port_name[3],
864                             sess->port_name[4], sess->port_name[5],
865                             sess->port_name[6], sess->port_name[7],
866                             sess->loop_id);
867
868                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf007,
869                             "Reappeared sess %p\n", sess);
870                 }
871                 ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
872                                         (fcport->flags & FCF_CONF_COMP_SUPPORTED));
873         }
874
875         if (sess && sess->local) {
876                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04d,
877                     "qla_target(%u): local session for "
878                     "port %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x "
879                     "(loop ID %d) became global\n", vha->vp_idx,
880                     fcport->port_name[0], fcport->port_name[1],
881                     fcport->port_name[2], fcport->port_name[3],
882                     fcport->port_name[4], fcport->port_name[5],
883                     fcport->port_name[6], fcport->port_name[7],
884                     sess->loop_id);
885                 sess->local = 0;
886         }
887         spin_unlock_irqrestore(&ha->hardware_lock, flags);
888
889         ha->tgt.tgt_ops->put_sess(sess);
890 }
891
892 void qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport)
893 {
894         struct qla_hw_data *ha = vha->hw;
895         struct qla_tgt *tgt = ha->tgt.qla_tgt;
896         struct qla_tgt_sess *sess;
897         unsigned long flags;
898
899         if (!vha->hw->tgt.tgt_ops)
900                 return;
901
902         if (!tgt || (fcport->port_type != FCT_INITIATOR))
903                 return;
904
905         spin_lock_irqsave(&ha->hardware_lock, flags);
906         if (tgt->tgt_stop) {
907                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
908                 return;
909         }
910         sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
911         if (!sess) {
912                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
913                 return;
914         }
915
916         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf008, "qla_tgt_fc_port_deleted %p", sess);
917
918         sess->local = 1;
919         qlt_schedule_sess_for_deletion(sess, false);
920         spin_unlock_irqrestore(&ha->hardware_lock, flags);
921 }
922
923 static inline int test_tgt_sess_count(struct qla_tgt *tgt)
924 {
925         struct qla_hw_data *ha = tgt->ha;
926         unsigned long flags;
927         int res;
928         /*
929          * We need to protect against race, when tgt is freed before or
930          * inside wake_up()
931          */
932         spin_lock_irqsave(&ha->hardware_lock, flags);
933         ql_dbg(ql_dbg_tgt, tgt->vha, 0xe002,
934             "tgt %p, empty(sess_list)=%d sess_count=%d\n",
935             tgt, list_empty(&tgt->sess_list), tgt->sess_count);
936         res = (tgt->sess_count == 0);
937         spin_unlock_irqrestore(&ha->hardware_lock, flags);
938
939         return res;
940 }
941
942 /* Called by tcm_qla2xxx configfs code */
943 void qlt_stop_phase1(struct qla_tgt *tgt)
944 {
945         struct scsi_qla_host *vha = tgt->vha;
946         struct qla_hw_data *ha = tgt->ha;
947         unsigned long flags;
948
949         if (tgt->tgt_stop || tgt->tgt_stopped) {
950                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04e,
951                     "Already in tgt->tgt_stop or tgt_stopped state\n");
952                 dump_stack();
953                 return;
954         }
955
956         ql_dbg(ql_dbg_tgt, vha, 0xe003, "Stopping target for host %ld(%p)\n",
957             vha->host_no, vha);
958         /*
959          * Mutex needed to sync with qla_tgt_fc_port_[added,deleted].
960          * Lock is needed, because we still can get an incoming packet.
961          */
962         mutex_lock(&ha->tgt.tgt_mutex);
963         spin_lock_irqsave(&ha->hardware_lock, flags);
964         tgt->tgt_stop = 1;
965         qlt_clear_tgt_db(tgt, true);
966         spin_unlock_irqrestore(&ha->hardware_lock, flags);
967         mutex_unlock(&ha->tgt.tgt_mutex);
968
969         flush_delayed_work(&tgt->sess_del_work);
970
971         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf009,
972             "Waiting for sess works (tgt %p)", tgt);
973         spin_lock_irqsave(&tgt->sess_work_lock, flags);
974         while (!list_empty(&tgt->sess_works_list)) {
975                 spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
976                 flush_scheduled_work();
977                 spin_lock_irqsave(&tgt->sess_work_lock, flags);
978         }
979         spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
980
981         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00a,
982             "Waiting for tgt %p: list_empty(sess_list)=%d "
983             "sess_count=%d\n", tgt, list_empty(&tgt->sess_list),
984             tgt->sess_count);
985
986         wait_event(tgt->waitQ, test_tgt_sess_count(tgt));
987
988         /* Big hammer */
989         if (!ha->flags.host_shutting_down && qla_tgt_mode_enabled(vha))
990                 qlt_disable_vha(vha);
991
992         /* Wait for sessions to clear out (just in case) */
993         wait_event(tgt->waitQ, test_tgt_sess_count(tgt));
994 }
995 EXPORT_SYMBOL(qlt_stop_phase1);
996
997 /* Called by tcm_qla2xxx configfs code */
998 void qlt_stop_phase2(struct qla_tgt *tgt)
999 {
1000         struct qla_hw_data *ha = tgt->ha;
1001         unsigned long flags;
1002
1003         if (tgt->tgt_stopped) {
1004                 ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf04f,
1005                     "Already in tgt->tgt_stopped state\n");
1006                 dump_stack();
1007                 return;
1008         }
1009
1010         ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00b,
1011             "Waiting for %d IRQ commands to complete (tgt %p)",
1012             tgt->irq_cmd_count, tgt);
1013
1014         mutex_lock(&ha->tgt.tgt_mutex);
1015         spin_lock_irqsave(&ha->hardware_lock, flags);
1016         while (tgt->irq_cmd_count != 0) {
1017                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
1018                 udelay(2);
1019                 spin_lock_irqsave(&ha->hardware_lock, flags);
1020         }
1021         tgt->tgt_stop = 0;
1022         tgt->tgt_stopped = 1;
1023         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1024         mutex_unlock(&ha->tgt.tgt_mutex);
1025
1026         ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00c, "Stop of tgt %p finished",
1027             tgt);
1028 }
1029 EXPORT_SYMBOL(qlt_stop_phase2);
1030
1031 /* Called from qlt_remove_target() -> qla2x00_remove_one() */
1032 static void qlt_release(struct qla_tgt *tgt)
1033 {
1034         struct qla_hw_data *ha = tgt->ha;
1035
1036         if ((ha->tgt.qla_tgt != NULL) && !tgt->tgt_stopped)
1037                 qlt_stop_phase2(tgt);
1038
1039         ha->tgt.qla_tgt = NULL;
1040
1041         ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00d,
1042             "Release of tgt %p finished\n", tgt);
1043
1044         kfree(tgt);
1045 }
1046
1047 /* ha->hardware_lock supposed to be held on entry */
1048 static int qlt_sched_sess_work(struct qla_tgt *tgt, int type,
1049         const void *param, unsigned int param_size)
1050 {
1051         struct qla_tgt_sess_work_param *prm;
1052         unsigned long flags;
1053
1054         prm = kzalloc(sizeof(*prm), GFP_ATOMIC);
1055         if (!prm) {
1056                 ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf050,
1057                     "qla_target(%d): Unable to create session "
1058                     "work, command will be refused", 0);
1059                 return -ENOMEM;
1060         }
1061
1062         ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00e,
1063             "Scheduling work (type %d, prm %p)"
1064             " to find session for param %p (size %d, tgt %p)\n",
1065             type, prm, param, param_size, tgt);
1066
1067         prm->type = type;
1068         memcpy(&prm->tm_iocb, param, param_size);
1069
1070         spin_lock_irqsave(&tgt->sess_work_lock, flags);
1071         list_add_tail(&prm->sess_works_list_entry, &tgt->sess_works_list);
1072         spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
1073
1074         schedule_work(&tgt->sess_work);
1075
1076         return 0;
1077 }
1078
1079 /*
1080  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
1081  */
1082 static void qlt_send_notify_ack(struct scsi_qla_host *vha,
1083         struct imm_ntfy_from_isp *ntfy,
1084         uint32_t add_flags, uint16_t resp_code, int resp_code_valid,
1085         uint16_t srr_flags, uint16_t srr_reject_code, uint8_t srr_explan)
1086 {
1087         struct qla_hw_data *ha = vha->hw;
1088         request_t *pkt;
1089         struct nack_to_isp *nack;
1090
1091         ql_dbg(ql_dbg_tgt, vha, 0xe004, "Sending NOTIFY_ACK (ha=%p)\n", ha);
1092
1093         /* Send marker if required */
1094         if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
1095                 return;
1096
1097         pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
1098         if (!pkt) {
1099                 ql_dbg(ql_dbg_tgt, vha, 0xe049,
1100                     "qla_target(%d): %s failed: unable to allocate "
1101                     "request packet\n", vha->vp_idx, __func__);
1102                 return;
1103         }
1104
1105         if (ha->tgt.qla_tgt != NULL)
1106                 ha->tgt.qla_tgt->notify_ack_expected++;
1107
1108         pkt->entry_type = NOTIFY_ACK_TYPE;
1109         pkt->entry_count = 1;
1110
1111         nack = (struct nack_to_isp *)pkt;
1112         nack->ox_id = ntfy->ox_id;
1113
1114         nack->u.isp24.nport_handle = ntfy->u.isp24.nport_handle;
1115         if (le16_to_cpu(ntfy->u.isp24.status) == IMM_NTFY_ELS) {
1116                 nack->u.isp24.flags = ntfy->u.isp24.flags &
1117                         __constant_cpu_to_le32(NOTIFY24XX_FLAGS_PUREX_IOCB);
1118         }
1119         nack->u.isp24.srr_rx_id = ntfy->u.isp24.srr_rx_id;
1120         nack->u.isp24.status = ntfy->u.isp24.status;
1121         nack->u.isp24.status_subcode = ntfy->u.isp24.status_subcode;
1122         nack->u.isp24.exchange_address = ntfy->u.isp24.exchange_address;
1123         nack->u.isp24.srr_rel_offs = ntfy->u.isp24.srr_rel_offs;
1124         nack->u.isp24.srr_ui = ntfy->u.isp24.srr_ui;
1125         nack->u.isp24.srr_flags = cpu_to_le16(srr_flags);
1126         nack->u.isp24.srr_reject_code = srr_reject_code;
1127         nack->u.isp24.srr_reject_code_expl = srr_explan;
1128         nack->u.isp24.vp_index = ntfy->u.isp24.vp_index;
1129
1130         ql_dbg(ql_dbg_tgt, vha, 0xe005,
1131             "qla_target(%d): Sending 24xx Notify Ack %d\n",
1132             vha->vp_idx, nack->u.isp24.status);
1133
1134         qla2x00_start_iocbs(vha, vha->req);
1135 }
1136
1137 /*
1138  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
1139  */
1140 static void qlt_24xx_send_abts_resp(struct scsi_qla_host *vha,
1141         struct abts_recv_from_24xx *abts, uint32_t status,
1142         bool ids_reversed)
1143 {
1144         struct qla_hw_data *ha = vha->hw;
1145         struct abts_resp_to_24xx *resp;
1146         uint32_t f_ctl;
1147         uint8_t *p;
1148
1149         ql_dbg(ql_dbg_tgt, vha, 0xe006,
1150             "Sending task mgmt ABTS response (ha=%p, atio=%p, status=%x\n",
1151             ha, abts, status);
1152
1153         /* Send marker if required */
1154         if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
1155                 return;
1156
1157         resp = (struct abts_resp_to_24xx *)qla2x00_alloc_iocbs(vha, NULL);
1158         if (!resp) {
1159                 ql_dbg(ql_dbg_tgt, vha, 0xe04a,
1160                     "qla_target(%d): %s failed: unable to allocate "
1161                     "request packet", vha->vp_idx, __func__);
1162                 return;
1163         }
1164
1165         resp->entry_type = ABTS_RESP_24XX;
1166         resp->entry_count = 1;
1167         resp->nport_handle = abts->nport_handle;
1168         resp->vp_index = vha->vp_idx;
1169         resp->sof_type = abts->sof_type;
1170         resp->exchange_address = abts->exchange_address;
1171         resp->fcp_hdr_le = abts->fcp_hdr_le;
1172         f_ctl = __constant_cpu_to_le32(F_CTL_EXCH_CONTEXT_RESP |
1173             F_CTL_LAST_SEQ | F_CTL_END_SEQ |
1174             F_CTL_SEQ_INITIATIVE);
1175         p = (uint8_t *)&f_ctl;
1176         resp->fcp_hdr_le.f_ctl[0] = *p++;
1177         resp->fcp_hdr_le.f_ctl[1] = *p++;
1178         resp->fcp_hdr_le.f_ctl[2] = *p;
1179         if (ids_reversed) {
1180                 resp->fcp_hdr_le.d_id[0] = abts->fcp_hdr_le.d_id[0];
1181                 resp->fcp_hdr_le.d_id[1] = abts->fcp_hdr_le.d_id[1];
1182                 resp->fcp_hdr_le.d_id[2] = abts->fcp_hdr_le.d_id[2];
1183                 resp->fcp_hdr_le.s_id[0] = abts->fcp_hdr_le.s_id[0];
1184                 resp->fcp_hdr_le.s_id[1] = abts->fcp_hdr_le.s_id[1];
1185                 resp->fcp_hdr_le.s_id[2] = abts->fcp_hdr_le.s_id[2];
1186         } else {
1187                 resp->fcp_hdr_le.d_id[0] = abts->fcp_hdr_le.s_id[0];
1188                 resp->fcp_hdr_le.d_id[1] = abts->fcp_hdr_le.s_id[1];
1189                 resp->fcp_hdr_le.d_id[2] = abts->fcp_hdr_le.s_id[2];
1190                 resp->fcp_hdr_le.s_id[0] = abts->fcp_hdr_le.d_id[0];
1191                 resp->fcp_hdr_le.s_id[1] = abts->fcp_hdr_le.d_id[1];
1192                 resp->fcp_hdr_le.s_id[2] = abts->fcp_hdr_le.d_id[2];
1193         }
1194         resp->exchange_addr_to_abort = abts->exchange_addr_to_abort;
1195         if (status == FCP_TMF_CMPL) {
1196                 resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_ACC;
1197                 resp->payload.ba_acct.seq_id_valid = SEQ_ID_INVALID;
1198                 resp->payload.ba_acct.low_seq_cnt = 0x0000;
1199                 resp->payload.ba_acct.high_seq_cnt = 0xFFFF;
1200                 resp->payload.ba_acct.ox_id = abts->fcp_hdr_le.ox_id;
1201                 resp->payload.ba_acct.rx_id = abts->fcp_hdr_le.rx_id;
1202         } else {
1203                 resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_RJT;
1204                 resp->payload.ba_rjt.reason_code =
1205                         BA_RJT_REASON_CODE_UNABLE_TO_PERFORM;
1206                 /* Other bytes are zero */
1207         }
1208
1209         ha->tgt.qla_tgt->abts_resp_expected++;
1210
1211         qla2x00_start_iocbs(vha, vha->req);
1212 }
1213
1214 /*
1215  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
1216  */
1217 static void qlt_24xx_retry_term_exchange(struct scsi_qla_host *vha,
1218         struct abts_resp_from_24xx_fw *entry)
1219 {
1220         struct ctio7_to_24xx *ctio;
1221
1222         ql_dbg(ql_dbg_tgt, vha, 0xe007,
1223             "Sending retry TERM EXCH CTIO7 (ha=%p)\n", vha->hw);
1224         /* Send marker if required */
1225         if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
1226                 return;
1227
1228         ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs(vha, NULL);
1229         if (ctio == NULL) {
1230                 ql_dbg(ql_dbg_tgt, vha, 0xe04b,
1231                     "qla_target(%d): %s failed: unable to allocate "
1232                     "request packet\n", vha->vp_idx, __func__);
1233                 return;
1234         }
1235
1236         /*
1237          * We've got on entrance firmware's response on by us generated
1238          * ABTS response. So, in it ID fields are reversed.
1239          */
1240
1241         ctio->entry_type = CTIO_TYPE7;
1242         ctio->entry_count = 1;
1243         ctio->nport_handle = entry->nport_handle;
1244         ctio->handle = QLA_TGT_SKIP_HANDLE |    CTIO_COMPLETION_HANDLE_MARK;
1245         ctio->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
1246         ctio->vp_index = vha->vp_idx;
1247         ctio->initiator_id[0] = entry->fcp_hdr_le.d_id[0];
1248         ctio->initiator_id[1] = entry->fcp_hdr_le.d_id[1];
1249         ctio->initiator_id[2] = entry->fcp_hdr_le.d_id[2];
1250         ctio->exchange_addr = entry->exchange_addr_to_abort;
1251         ctio->u.status1.flags =
1252             __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
1253                 CTIO7_FLAGS_TERMINATE);
1254         ctio->u.status1.ox_id = entry->fcp_hdr_le.ox_id;
1255
1256         qla2x00_start_iocbs(vha, vha->req);
1257
1258         qlt_24xx_send_abts_resp(vha, (struct abts_recv_from_24xx *)entry,
1259             FCP_TMF_CMPL, true);
1260 }
1261
1262 /* ha->hardware_lock supposed to be held on entry */
1263 static int __qlt_24xx_handle_abts(struct scsi_qla_host *vha,
1264         struct abts_recv_from_24xx *abts, struct qla_tgt_sess *sess)
1265 {
1266         struct qla_hw_data *ha = vha->hw;
1267         struct qla_tgt_mgmt_cmd *mcmd;
1268         int rc;
1269
1270         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00f,
1271             "qla_target(%d): task abort (tag=%d)\n",
1272             vha->vp_idx, abts->exchange_addr_to_abort);
1273
1274         mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
1275         if (mcmd == NULL) {
1276                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf051,
1277                     "qla_target(%d): %s: Allocation of ABORT cmd failed",
1278                     vha->vp_idx, __func__);
1279                 return -ENOMEM;
1280         }
1281         memset(mcmd, 0, sizeof(*mcmd));
1282
1283         mcmd->sess = sess;
1284         memcpy(&mcmd->orig_iocb.abts, abts, sizeof(mcmd->orig_iocb.abts));
1285
1286         rc = ha->tgt.tgt_ops->handle_tmr(mcmd, 0, TMR_ABORT_TASK,
1287             abts->exchange_addr_to_abort);
1288         if (rc != 0) {
1289                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf052,
1290                     "qla_target(%d):  tgt_ops->handle_tmr()"
1291                     " failed: %d", vha->vp_idx, rc);
1292                 mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
1293                 return -EFAULT;
1294         }
1295
1296         return 0;
1297 }
1298
1299 /*
1300  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
1301  */
1302 static void qlt_24xx_handle_abts(struct scsi_qla_host *vha,
1303         struct abts_recv_from_24xx *abts)
1304 {
1305         struct qla_hw_data *ha = vha->hw;
1306         struct qla_tgt_sess *sess;
1307         uint32_t tag = abts->exchange_addr_to_abort;
1308         uint8_t s_id[3];
1309         int rc;
1310
1311         if (le32_to_cpu(abts->fcp_hdr_le.parameter) & ABTS_PARAM_ABORT_SEQ) {
1312                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf053,
1313                     "qla_target(%d): ABTS: Abort Sequence not "
1314                     "supported\n", vha->vp_idx);
1315                 qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
1316                 return;
1317         }
1318
1319         if (tag == ATIO_EXCHANGE_ADDRESS_UNKNOWN) {
1320                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf010,
1321                     "qla_target(%d): ABTS: Unknown Exchange "
1322                     "Address received\n", vha->vp_idx);
1323                 qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
1324                 return;
1325         }
1326
1327         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf011,
1328             "qla_target(%d): task abort (s_id=%x:%x:%x, "
1329             "tag=%d, param=%x)\n", vha->vp_idx, abts->fcp_hdr_le.s_id[2],
1330             abts->fcp_hdr_le.s_id[1], abts->fcp_hdr_le.s_id[0], tag,
1331             le32_to_cpu(abts->fcp_hdr_le.parameter));
1332
1333         s_id[0] = abts->fcp_hdr_le.s_id[2];
1334         s_id[1] = abts->fcp_hdr_le.s_id[1];
1335         s_id[2] = abts->fcp_hdr_le.s_id[0];
1336
1337         sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
1338         if (!sess) {
1339                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf012,
1340                     "qla_target(%d): task abort for non-existant session\n",
1341                     vha->vp_idx);
1342                 rc = qlt_sched_sess_work(ha->tgt.qla_tgt,
1343                     QLA_TGT_SESS_WORK_ABORT, abts, sizeof(*abts));
1344                 if (rc != 0) {
1345                         qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED,
1346                             false);
1347                 }
1348                 return;
1349         }
1350
1351         rc = __qlt_24xx_handle_abts(vha, abts, sess);
1352         if (rc != 0) {
1353                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf054,
1354                     "qla_target(%d): __qlt_24xx_handle_abts() failed: %d\n",
1355                     vha->vp_idx, rc);
1356                 qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
1357                 return;
1358         }
1359 }
1360
1361 /*
1362  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
1363  */
1364 static void qlt_24xx_send_task_mgmt_ctio(struct scsi_qla_host *ha,
1365         struct qla_tgt_mgmt_cmd *mcmd, uint32_t resp_code)
1366 {
1367         struct atio_from_isp *atio = &mcmd->orig_iocb.atio;
1368         struct ctio7_to_24xx *ctio;
1369
1370         ql_dbg(ql_dbg_tgt, ha, 0xe008,
1371             "Sending task mgmt CTIO7 (ha=%p, atio=%p, resp_code=%x\n",
1372             ha, atio, resp_code);
1373
1374         /* Send marker if required */
1375         if (qlt_issue_marker(ha, 1) != QLA_SUCCESS)
1376                 return;
1377
1378         ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs(ha, NULL);
1379         if (ctio == NULL) {
1380                 ql_dbg(ql_dbg_tgt, ha, 0xe04c,
1381                     "qla_target(%d): %s failed: unable to allocate "
1382                     "request packet\n", ha->vp_idx, __func__);
1383                 return;
1384         }
1385
1386         ctio->entry_type = CTIO_TYPE7;
1387         ctio->entry_count = 1;
1388         ctio->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
1389         ctio->nport_handle = mcmd->sess->loop_id;
1390         ctio->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
1391         ctio->vp_index = ha->vp_idx;
1392         ctio->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
1393         ctio->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
1394         ctio->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
1395         ctio->exchange_addr = atio->u.isp24.exchange_addr;
1396         ctio->u.status1.flags = (atio->u.isp24.attr << 9) |
1397             __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
1398                 CTIO7_FLAGS_SEND_STATUS);
1399         ctio->u.status1.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
1400         ctio->u.status1.scsi_status =
1401             __constant_cpu_to_le16(SS_RESPONSE_INFO_LEN_VALID);
1402         ctio->u.status1.response_len = __constant_cpu_to_le16(8);
1403         ctio->u.status1.sense_data[0] = resp_code;
1404
1405         qla2x00_start_iocbs(ha, ha->req);
1406 }
1407
1408 void qlt_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
1409 {
1410         mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
1411 }
1412 EXPORT_SYMBOL(qlt_free_mcmd);
1413
1414 /* callback from target fabric module code */
1415 void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *mcmd)
1416 {
1417         struct scsi_qla_host *vha = mcmd->sess->vha;
1418         struct qla_hw_data *ha = vha->hw;
1419         unsigned long flags;
1420
1421         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf013,
1422             "TM response mcmd (%p) status %#x state %#x",
1423             mcmd, mcmd->fc_tm_rsp, mcmd->flags);
1424
1425         spin_lock_irqsave(&ha->hardware_lock, flags);
1426         if (mcmd->flags == QLA24XX_MGMT_SEND_NACK)
1427                 qlt_send_notify_ack(vha, &mcmd->orig_iocb.imm_ntfy,
1428                     0, 0, 0, 0, 0, 0);
1429         else {
1430                 if (mcmd->se_cmd.se_tmr_req->function == TMR_ABORT_TASK)
1431                         qlt_24xx_send_abts_resp(vha, &mcmd->orig_iocb.abts,
1432                             mcmd->fc_tm_rsp, false);
1433                 else
1434                         qlt_24xx_send_task_mgmt_ctio(vha, mcmd,
1435                             mcmd->fc_tm_rsp);
1436         }
1437         /*
1438          * Make the callback for ->free_mcmd() to queue_work() and invoke
1439          * target_put_sess_cmd() to drop cmd_kref to 1.  The final
1440          * target_put_sess_cmd() call will be made from TFO->check_stop_free()
1441          * -> tcm_qla2xxx_check_stop_free() to release the TMR associated se_cmd
1442          * descriptor after TFO->queue_tm_rsp() -> tcm_qla2xxx_queue_tm_rsp() ->
1443          * qlt_xmit_tm_rsp() returns here..
1444          */
1445         ha->tgt.tgt_ops->free_mcmd(mcmd);
1446         spin_unlock_irqrestore(&ha->hardware_lock, flags);
1447 }
1448 EXPORT_SYMBOL(qlt_xmit_tm_rsp);
1449
1450 /* No locks */
1451 static int qlt_pci_map_calc_cnt(struct qla_tgt_prm *prm)
1452 {
1453         struct qla_tgt_cmd *cmd = prm->cmd;
1454
1455         BUG_ON(cmd->sg_cnt == 0);
1456
1457         prm->sg = (struct scatterlist *)cmd->sg;
1458         prm->seg_cnt = pci_map_sg(prm->tgt->ha->pdev, cmd->sg,
1459             cmd->sg_cnt, cmd->dma_data_direction);
1460         if (unlikely(prm->seg_cnt == 0))
1461                 goto out_err;
1462
1463         prm->cmd->sg_mapped = 1;
1464
1465         /*
1466          * If greater than four sg entries then we need to allocate
1467          * the continuation entries
1468          */
1469         if (prm->seg_cnt > prm->tgt->datasegs_per_cmd)
1470                 prm->req_cnt += DIV_ROUND_UP(prm->seg_cnt -
1471                     prm->tgt->datasegs_per_cmd, prm->tgt->datasegs_per_cont);
1472
1473         ql_dbg(ql_dbg_tgt, prm->cmd->vha, 0xe009, "seg_cnt=%d, req_cnt=%d\n",
1474             prm->seg_cnt, prm->req_cnt);
1475         return 0;
1476
1477 out_err:
1478         ql_dbg(ql_dbg_tgt, prm->cmd->vha, 0xe04d,
1479             "qla_target(%d): PCI mapping failed: sg_cnt=%d",
1480             0, prm->cmd->sg_cnt);
1481         return -1;
1482 }
1483
1484 static inline void qlt_unmap_sg(struct scsi_qla_host *vha,
1485         struct qla_tgt_cmd *cmd)
1486 {
1487         struct qla_hw_data *ha = vha->hw;
1488
1489         BUG_ON(!cmd->sg_mapped);
1490         pci_unmap_sg(ha->pdev, cmd->sg, cmd->sg_cnt, cmd->dma_data_direction);
1491         cmd->sg_mapped = 0;
1492 }
1493
1494 static int qlt_check_reserve_free_req(struct scsi_qla_host *vha,
1495         uint32_t req_cnt)
1496 {
1497         struct qla_hw_data *ha = vha->hw;
1498         device_reg_t __iomem *reg = ha->iobase;
1499         uint32_t cnt;
1500
1501         if (vha->req->cnt < (req_cnt + 2)) {
1502                 cnt = (uint16_t)RD_REG_DWORD(&reg->isp24.req_q_out);
1503
1504                 ql_dbg(ql_dbg_tgt, vha, 0xe00a,
1505                     "Request ring circled: cnt=%d, vha->->ring_index=%d, "
1506                     "vha->req->cnt=%d, req_cnt=%d\n", cnt,
1507                     vha->req->ring_index, vha->req->cnt, req_cnt);
1508                 if  (vha->req->ring_index < cnt)
1509                         vha->req->cnt = cnt - vha->req->ring_index;
1510                 else
1511                         vha->req->cnt = vha->req->length -
1512                             (vha->req->ring_index - cnt);
1513         }
1514
1515         if (unlikely(vha->req->cnt < (req_cnt + 2))) {
1516                 ql_dbg(ql_dbg_tgt, vha, 0xe00b,
1517                     "qla_target(%d): There is no room in the "
1518                     "request ring: vha->req->ring_index=%d, vha->req->cnt=%d, "
1519                     "req_cnt=%d\n", vha->vp_idx, vha->req->ring_index,
1520                     vha->req->cnt, req_cnt);
1521                 return -EAGAIN;
1522         }
1523         vha->req->cnt -= req_cnt;
1524
1525         return 0;
1526 }
1527
1528 /*
1529  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
1530  */
1531 static inline void *qlt_get_req_pkt(struct scsi_qla_host *vha)
1532 {
1533         /* Adjust ring index. */
1534         vha->req->ring_index++;
1535         if (vha->req->ring_index == vha->req->length) {
1536                 vha->req->ring_index = 0;
1537                 vha->req->ring_ptr = vha->req->ring;
1538         } else {
1539                 vha->req->ring_ptr++;
1540         }
1541         return (cont_entry_t *)vha->req->ring_ptr;
1542 }
1543
1544 /* ha->hardware_lock supposed to be held on entry */
1545 static inline uint32_t qlt_make_handle(struct scsi_qla_host *vha)
1546 {
1547         struct qla_hw_data *ha = vha->hw;
1548         uint32_t h;
1549
1550         h = ha->tgt.current_handle;
1551         /* always increment cmd handle */
1552         do {
1553                 ++h;
1554                 if (h > MAX_OUTSTANDING_COMMANDS)
1555                         h = 1; /* 0 is QLA_TGT_NULL_HANDLE */
1556                 if (h == ha->tgt.current_handle) {
1557                         ql_dbg(ql_dbg_tgt, vha, 0xe04e,
1558                             "qla_target(%d): Ran out of "
1559                             "empty cmd slots in ha %p\n", vha->vp_idx, ha);
1560                         h = QLA_TGT_NULL_HANDLE;
1561                         break;
1562                 }
1563         } while ((h == QLA_TGT_NULL_HANDLE) ||
1564             (h == QLA_TGT_SKIP_HANDLE) ||
1565             (ha->tgt.cmds[h-1] != NULL));
1566
1567         if (h != QLA_TGT_NULL_HANDLE)
1568                 ha->tgt.current_handle = h;
1569
1570         return h;
1571 }
1572
1573 /* ha->hardware_lock supposed to be held on entry */
1574 static int qlt_24xx_build_ctio_pkt(struct qla_tgt_prm *prm,
1575         struct scsi_qla_host *vha)
1576 {
1577         uint32_t h;
1578         struct ctio7_to_24xx *pkt;
1579         struct qla_hw_data *ha = vha->hw;
1580         struct atio_from_isp *atio = &prm->cmd->atio;
1581
1582         pkt = (struct ctio7_to_24xx *)vha->req->ring_ptr;
1583         prm->pkt = pkt;
1584         memset(pkt, 0, sizeof(*pkt));
1585
1586         pkt->entry_type = CTIO_TYPE7;
1587         pkt->entry_count = (uint8_t)prm->req_cnt;
1588         pkt->vp_index = vha->vp_idx;
1589
1590         h = qlt_make_handle(vha);
1591         if (unlikely(h == QLA_TGT_NULL_HANDLE)) {
1592                 /*
1593                  * CTIO type 7 from the firmware doesn't provide a way to
1594                  * know the initiator's LOOP ID, hence we can't find
1595                  * the session and, so, the command.
1596                  */
1597                 return -EAGAIN;
1598         } else
1599                 ha->tgt.cmds[h-1] = prm->cmd;
1600
1601         pkt->handle = h | CTIO_COMPLETION_HANDLE_MARK;
1602         pkt->nport_handle = prm->cmd->loop_id;
1603         pkt->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
1604         pkt->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
1605         pkt->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
1606         pkt->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
1607         pkt->exchange_addr = atio->u.isp24.exchange_addr;
1608         pkt->u.status0.flags |= (atio->u.isp24.attr << 9);
1609         pkt->u.status0.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
1610         pkt->u.status0.relative_offset = cpu_to_le32(prm->cmd->offset);
1611
1612         ql_dbg(ql_dbg_tgt, vha, 0xe00c,
1613             "qla_target(%d): handle(cmd) -> %08x, timeout %d, ox_id %#x\n",
1614             vha->vp_idx, pkt->handle, QLA_TGT_TIMEOUT,
1615             le16_to_cpu(pkt->u.status0.ox_id));
1616         return 0;
1617 }
1618
1619 /*
1620  * ha->hardware_lock supposed to be held on entry. We have already made sure
1621  * that there is sufficient amount of request entries to not drop it.
1622  */
1623 static void qlt_load_cont_data_segments(struct qla_tgt_prm *prm,
1624         struct scsi_qla_host *vha)
1625 {
1626         int cnt;
1627         uint32_t *dword_ptr;
1628         int enable_64bit_addressing = prm->tgt->tgt_enable_64bit_addr;
1629
1630         /* Build continuation packets */
1631         while (prm->seg_cnt > 0) {
1632                 cont_a64_entry_t *cont_pkt64 =
1633                         (cont_a64_entry_t *)qlt_get_req_pkt(vha);
1634
1635                 /*
1636                  * Make sure that from cont_pkt64 none of
1637                  * 64-bit specific fields used for 32-bit
1638                  * addressing. Cast to (cont_entry_t *) for
1639                  * that.
1640                  */
1641
1642                 memset(cont_pkt64, 0, sizeof(*cont_pkt64));
1643
1644                 cont_pkt64->entry_count = 1;
1645                 cont_pkt64->sys_define = 0;
1646
1647                 if (enable_64bit_addressing) {
1648                         cont_pkt64->entry_type = CONTINUE_A64_TYPE;
1649                         dword_ptr =
1650                             (uint32_t *)&cont_pkt64->dseg_0_address;
1651                 } else {
1652                         cont_pkt64->entry_type = CONTINUE_TYPE;
1653                         dword_ptr =
1654                             (uint32_t *)&((cont_entry_t *)
1655                                 cont_pkt64)->dseg_0_address;
1656                 }
1657
1658                 /* Load continuation entry data segments */
1659                 for (cnt = 0;
1660                     cnt < prm->tgt->datasegs_per_cont && prm->seg_cnt;
1661                     cnt++, prm->seg_cnt--) {
1662                         *dword_ptr++ =
1663                             cpu_to_le32(pci_dma_lo32
1664                                 (sg_dma_address(prm->sg)));
1665                         if (enable_64bit_addressing) {
1666                                 *dword_ptr++ =
1667                                     cpu_to_le32(pci_dma_hi32
1668                                         (sg_dma_address
1669                                         (prm->sg)));
1670                         }
1671                         *dword_ptr++ = cpu_to_le32(sg_dma_len(prm->sg));
1672
1673                         ql_dbg(ql_dbg_tgt, vha, 0xe00d,
1674                             "S/G Segment Cont. phys_addr=%llx:%llx, len=%d\n",
1675                             (long long unsigned int)
1676                             pci_dma_hi32(sg_dma_address(prm->sg)),
1677                             (long long unsigned int)
1678                             pci_dma_lo32(sg_dma_address(prm->sg)),
1679                             (int)sg_dma_len(prm->sg));
1680
1681                         prm->sg = sg_next(prm->sg);
1682                 }
1683         }
1684 }
1685
1686 /*
1687  * ha->hardware_lock supposed to be held on entry. We have already made sure
1688  * that there is sufficient amount of request entries to not drop it.
1689  */
1690 static void qlt_load_data_segments(struct qla_tgt_prm *prm,
1691         struct scsi_qla_host *vha)
1692 {
1693         int cnt;
1694         uint32_t *dword_ptr;
1695         int enable_64bit_addressing = prm->tgt->tgt_enable_64bit_addr;
1696         struct ctio7_to_24xx *pkt24 = (struct ctio7_to_24xx *)prm->pkt;
1697
1698         ql_dbg(ql_dbg_tgt, vha, 0xe00e,
1699             "iocb->scsi_status=%x, iocb->flags=%x\n",
1700             le16_to_cpu(pkt24->u.status0.scsi_status),
1701             le16_to_cpu(pkt24->u.status0.flags));
1702
1703         pkt24->u.status0.transfer_length = cpu_to_le32(prm->cmd->bufflen);
1704
1705         /* Setup packet address segment pointer */
1706         dword_ptr = pkt24->u.status0.dseg_0_address;
1707
1708         /* Set total data segment count */
1709         if (prm->seg_cnt)
1710                 pkt24->dseg_count = cpu_to_le16(prm->seg_cnt);
1711
1712         if (prm->seg_cnt == 0) {
1713                 /* No data transfer */
1714                 *dword_ptr++ = 0;
1715                 *dword_ptr = 0;
1716                 return;
1717         }
1718
1719         /* If scatter gather */
1720         ql_dbg(ql_dbg_tgt, vha, 0xe00f, "%s", "Building S/G data segments...");
1721
1722         /* Load command entry data segments */
1723         for (cnt = 0;
1724             (cnt < prm->tgt->datasegs_per_cmd) && prm->seg_cnt;
1725             cnt++, prm->seg_cnt--) {
1726                 *dword_ptr++ =
1727                     cpu_to_le32(pci_dma_lo32(sg_dma_address(prm->sg)));
1728                 if (enable_64bit_addressing) {
1729                         *dword_ptr++ =
1730                             cpu_to_le32(pci_dma_hi32(
1731                                 sg_dma_address(prm->sg)));
1732                 }
1733                 *dword_ptr++ = cpu_to_le32(sg_dma_len(prm->sg));
1734
1735                 ql_dbg(ql_dbg_tgt, vha, 0xe010,
1736                     "S/G Segment phys_addr=%llx:%llx, len=%d\n",
1737                     (long long unsigned int)pci_dma_hi32(sg_dma_address(
1738                     prm->sg)),
1739                     (long long unsigned int)pci_dma_lo32(sg_dma_address(
1740                     prm->sg)),
1741                     (int)sg_dma_len(prm->sg));
1742
1743                 prm->sg = sg_next(prm->sg);
1744         }
1745
1746         qlt_load_cont_data_segments(prm, vha);
1747 }
1748
1749 static inline int qlt_has_data(struct qla_tgt_cmd *cmd)
1750 {
1751         return cmd->bufflen > 0;
1752 }
1753
1754 /*
1755  * Called without ha->hardware_lock held
1756  */
1757 static int qlt_pre_xmit_response(struct qla_tgt_cmd *cmd,
1758         struct qla_tgt_prm *prm, int xmit_type, uint8_t scsi_status,
1759         uint32_t *full_req_cnt)
1760 {
1761         struct qla_tgt *tgt = cmd->tgt;
1762         struct scsi_qla_host *vha = tgt->vha;
1763         struct qla_hw_data *ha = vha->hw;
1764         struct se_cmd *se_cmd = &cmd->se_cmd;
1765
1766         if (unlikely(cmd->aborted)) {
1767                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf014,
1768                     "qla_target(%d): terminating exchange "
1769                     "for aborted cmd=%p (se_cmd=%p, tag=%d)", vha->vp_idx, cmd,
1770                     se_cmd, cmd->tag);
1771
1772                 cmd->state = QLA_TGT_STATE_ABORTED;
1773
1774                 qlt_send_term_exchange(vha, cmd, &cmd->atio, 0);
1775
1776                 /* !! At this point cmd could be already freed !! */
1777                 return QLA_TGT_PRE_XMIT_RESP_CMD_ABORTED;
1778         }
1779
1780         ql_dbg(ql_dbg_tgt, vha, 0xe011, "qla_target(%d): tag=%u\n",
1781             vha->vp_idx, cmd->tag);
1782
1783         prm->cmd = cmd;
1784         prm->tgt = tgt;
1785         prm->rq_result = scsi_status;
1786         prm->sense_buffer = &cmd->sense_buffer[0];
1787         prm->sense_buffer_len = TRANSPORT_SENSE_BUFFER;
1788         prm->sg = NULL;
1789         prm->seg_cnt = -1;
1790         prm->req_cnt = 1;
1791         prm->add_status_pkt = 0;
1792
1793         ql_dbg(ql_dbg_tgt, vha, 0xe012, "rq_result=%x, xmit_type=%x\n",
1794             prm->rq_result, xmit_type);
1795
1796         /* Send marker if required */
1797         if (qlt_issue_marker(vha, 0) != QLA_SUCCESS)
1798                 return -EFAULT;
1799
1800         ql_dbg(ql_dbg_tgt, vha, 0xe013, "CTIO start: vha(%d)\n", vha->vp_idx);
1801
1802         if ((xmit_type & QLA_TGT_XMIT_DATA) && qlt_has_data(cmd)) {
1803                 if  (qlt_pci_map_calc_cnt(prm) != 0)
1804                         return -EAGAIN;
1805         }
1806
1807         *full_req_cnt = prm->req_cnt;
1808
1809         if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
1810                 prm->residual = se_cmd->residual_count;
1811                 ql_dbg(ql_dbg_tgt, vha, 0xe014,
1812                     "Residual underflow: %d (tag %d, "
1813                     "op %x, bufflen %d, rq_result %x)\n", prm->residual,
1814                     cmd->tag, se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
1815                     cmd->bufflen, prm->rq_result);
1816                 prm->rq_result |= SS_RESIDUAL_UNDER;
1817         } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1818                 prm->residual = se_cmd->residual_count;
1819                 ql_dbg(ql_dbg_tgt, vha, 0xe015,
1820                     "Residual overflow: %d (tag %d, "
1821                     "op %x, bufflen %d, rq_result %x)\n", prm->residual,
1822                     cmd->tag, se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
1823                     cmd->bufflen, prm->rq_result);
1824                 prm->rq_result |= SS_RESIDUAL_OVER;
1825         }
1826
1827         if (xmit_type & QLA_TGT_XMIT_STATUS) {
1828                 /*
1829                  * If QLA_TGT_XMIT_DATA is not set, add_status_pkt will be
1830                  * ignored in *xmit_response() below
1831                  */
1832                 if (qlt_has_data(cmd)) {
1833                         if (QLA_TGT_SENSE_VALID(prm->sense_buffer) ||
1834                             (IS_FWI2_CAPABLE(ha) &&
1835                             (prm->rq_result != 0))) {
1836                                 prm->add_status_pkt = 1;
1837                                 (*full_req_cnt)++;
1838                         }
1839                 }
1840         }
1841
1842         ql_dbg(ql_dbg_tgt, vha, 0xe016,
1843             "req_cnt=%d, full_req_cnt=%d, add_status_pkt=%d\n",
1844             prm->req_cnt, *full_req_cnt, prm->add_status_pkt);
1845
1846         return 0;
1847 }
1848
1849 static inline int qlt_need_explicit_conf(struct qla_hw_data *ha,
1850         struct qla_tgt_cmd *cmd, int sending_sense)
1851 {
1852         if (ha->tgt.enable_class_2)
1853                 return 0;
1854
1855         if (sending_sense)
1856                 return cmd->conf_compl_supported;
1857         else
1858                 return ha->tgt.enable_explicit_conf &&
1859                     cmd->conf_compl_supported;
1860 }
1861
1862 #ifdef CONFIG_QLA_TGT_DEBUG_SRR
1863 /*
1864  *  Original taken from the XFS code
1865  */
1866 static unsigned long qlt_srr_random(void)
1867 {
1868         static int Inited;
1869         static unsigned long RandomValue;
1870         static DEFINE_SPINLOCK(lock);
1871         /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
1872         register long rv;
1873         register long lo;
1874         register long hi;
1875         unsigned long flags;
1876
1877         spin_lock_irqsave(&lock, flags);
1878         if (!Inited) {
1879                 RandomValue = jiffies;
1880                 Inited = 1;
1881         }
1882         rv = RandomValue;
1883         hi = rv / 127773;
1884         lo = rv % 127773;
1885         rv = 16807 * lo - 2836 * hi;
1886         if (rv <= 0)
1887                 rv += 2147483647;
1888         RandomValue = rv;
1889         spin_unlock_irqrestore(&lock, flags);
1890         return rv;
1891 }
1892
1893 static void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
1894 {
1895 #if 0 /* This is not a real status packets lost, so it won't lead to SRR */
1896         if ((*xmit_type & QLA_TGT_XMIT_STATUS) && (qlt_srr_random() % 200)
1897             == 50) {
1898                 *xmit_type &= ~QLA_TGT_XMIT_STATUS;
1899                 ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf015,
1900                     "Dropping cmd %p (tag %d) status", cmd, cmd->tag);
1901         }
1902 #endif
1903         /*
1904          * It's currently not possible to simulate SRRs for FCP_WRITE without
1905          * a physical link layer failure, so don't even try here..
1906          */
1907         if (cmd->dma_data_direction != DMA_FROM_DEVICE)
1908                 return;
1909
1910         if (qlt_has_data(cmd) && (cmd->sg_cnt > 1) &&
1911             ((qlt_srr_random() % 100) == 20)) {
1912                 int i, leave = 0;
1913                 unsigned int tot_len = 0;
1914
1915                 while (leave == 0)
1916                         leave = qlt_srr_random() % cmd->sg_cnt;
1917
1918                 for (i = 0; i < leave; i++)
1919                         tot_len += cmd->sg[i].length;
1920
1921                 ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf016,
1922                     "Cutting cmd %p (tag %d) buffer"
1923                     " tail to len %d, sg_cnt %d (cmd->bufflen %d,"
1924                     " cmd->sg_cnt %d)", cmd, cmd->tag, tot_len, leave,
1925                     cmd->bufflen, cmd->sg_cnt);
1926
1927                 cmd->bufflen = tot_len;
1928                 cmd->sg_cnt = leave;
1929         }
1930
1931         if (qlt_has_data(cmd) && ((qlt_srr_random() % 100) == 70)) {
1932                 unsigned int offset = qlt_srr_random() % cmd->bufflen;
1933
1934                 ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf017,
1935                     "Cutting cmd %p (tag %d) buffer head "
1936                     "to offset %d (cmd->bufflen %d)", cmd, cmd->tag, offset,
1937                     cmd->bufflen);
1938                 if (offset == 0)
1939                         *xmit_type &= ~QLA_TGT_XMIT_DATA;
1940                 else if (qlt_set_data_offset(cmd, offset)) {
1941                         ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf018,
1942                             "qlt_set_data_offset() failed (tag %d)", cmd->tag);
1943                 }
1944         }
1945 }
1946 #else
1947 static inline void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
1948 {}
1949 #endif
1950
1951 static void qlt_24xx_init_ctio_to_isp(struct ctio7_to_24xx *ctio,
1952         struct qla_tgt_prm *prm)
1953 {
1954         prm->sense_buffer_len = min_t(uint32_t, prm->sense_buffer_len,
1955             (uint32_t)sizeof(ctio->u.status1.sense_data));
1956         ctio->u.status0.flags |=
1957             __constant_cpu_to_le16(CTIO7_FLAGS_SEND_STATUS);
1958         if (qlt_need_explicit_conf(prm->tgt->ha, prm->cmd, 0)) {
1959                 ctio->u.status0.flags |= __constant_cpu_to_le16(
1960                     CTIO7_FLAGS_EXPLICIT_CONFORM |
1961                     CTIO7_FLAGS_CONFORM_REQ);
1962         }
1963         ctio->u.status0.residual = cpu_to_le32(prm->residual);
1964         ctio->u.status0.scsi_status = cpu_to_le16(prm->rq_result);
1965         if (QLA_TGT_SENSE_VALID(prm->sense_buffer)) {
1966                 int i;
1967
1968                 if (qlt_need_explicit_conf(prm->tgt->ha, prm->cmd, 1)) {
1969                         if (prm->cmd->se_cmd.scsi_status != 0) {
1970                                 ql_dbg(ql_dbg_tgt, prm->cmd->vha, 0xe017,
1971                                     "Skipping EXPLICIT_CONFORM and "
1972                                     "CTIO7_FLAGS_CONFORM_REQ for FCP READ w/ "
1973                                     "non GOOD status\n");
1974                                 goto skip_explict_conf;
1975                         }
1976                         ctio->u.status1.flags |= __constant_cpu_to_le16(
1977                             CTIO7_FLAGS_EXPLICIT_CONFORM |
1978                             CTIO7_FLAGS_CONFORM_REQ);
1979                 }
1980 skip_explict_conf:
1981                 ctio->u.status1.flags &=
1982                     ~__constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_0);
1983                 ctio->u.status1.flags |=
1984                     __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1);
1985                 ctio->u.status1.scsi_status |=
1986                     __constant_cpu_to_le16(SS_SENSE_LEN_VALID);
1987                 ctio->u.status1.sense_length =
1988                     cpu_to_le16(prm->sense_buffer_len);
1989                 for (i = 0; i < prm->sense_buffer_len/4; i++)
1990                         ((uint32_t *)ctio->u.status1.sense_data)[i] =
1991                                 cpu_to_be32(((uint32_t *)prm->sense_buffer)[i]);
1992 #if 0
1993                 if (unlikely((prm->sense_buffer_len % 4) != 0)) {
1994                         static int q;
1995                         if (q < 10) {
1996                                 ql_dbg(ql_dbg_tgt, vha, 0xe04f,
1997                                     "qla_target(%d): %d bytes of sense "
1998                                     "lost", prm->tgt->ha->vp_idx,
1999                                     prm->sense_buffer_len % 4);
2000                                 q++;
2001                         }
2002                 }
2003 #endif
2004         } else {
2005                 ctio->u.status1.flags &=
2006                     ~__constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_0);
2007                 ctio->u.status1.flags |=
2008                     __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1);
2009                 ctio->u.status1.sense_length = 0;
2010                 memset(ctio->u.status1.sense_data, 0,
2011                     sizeof(ctio->u.status1.sense_data));
2012         }
2013
2014         /* Sense with len > 24, is it possible ??? */
2015 }
2016
2017 /*
2018  * Callback to setup response of xmit_type of QLA_TGT_XMIT_DATA and *
2019  * QLA_TGT_XMIT_STATUS for >= 24xx silicon
2020  */
2021 int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
2022         uint8_t scsi_status)
2023 {
2024         struct scsi_qla_host *vha = cmd->vha;
2025         struct qla_hw_data *ha = vha->hw;
2026         struct ctio7_to_24xx *pkt;
2027         struct qla_tgt_prm prm;
2028         uint32_t full_req_cnt = 0;
2029         unsigned long flags = 0;
2030         int res;
2031
2032         memset(&prm, 0, sizeof(prm));
2033         qlt_check_srr_debug(cmd, &xmit_type);
2034
2035         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe018,
2036             "is_send_status=%d, cmd->bufflen=%d, cmd->sg_cnt=%d, "
2037             "cmd->dma_data_direction=%d\n", (xmit_type & QLA_TGT_XMIT_STATUS) ?
2038             1 : 0, cmd->bufflen, cmd->sg_cnt, cmd->dma_data_direction);
2039
2040         res = qlt_pre_xmit_response(cmd, &prm, xmit_type, scsi_status,
2041             &full_req_cnt);
2042         if (unlikely(res != 0)) {
2043                 if (res == QLA_TGT_PRE_XMIT_RESP_CMD_ABORTED)
2044                         return 0;
2045
2046                 return res;
2047         }
2048
2049         spin_lock_irqsave(&ha->hardware_lock, flags);
2050
2051         /* Does F/W have an IOCBs for this request */
2052         res = qlt_check_reserve_free_req(vha, full_req_cnt);
2053         if (unlikely(res))
2054                 goto out_unmap_unlock;
2055
2056         res = qlt_24xx_build_ctio_pkt(&prm, vha);
2057         if (unlikely(res != 0))
2058                 goto out_unmap_unlock;
2059
2060
2061         pkt = (struct ctio7_to_24xx *)prm.pkt;
2062
2063         if (qlt_has_data(cmd) && (xmit_type & QLA_TGT_XMIT_DATA)) {
2064                 pkt->u.status0.flags |=
2065                     __constant_cpu_to_le16(CTIO7_FLAGS_DATA_IN |
2066                         CTIO7_FLAGS_STATUS_MODE_0);
2067
2068                 qlt_load_data_segments(&prm, vha);
2069
2070                 if (prm.add_status_pkt == 0) {
2071                         if (xmit_type & QLA_TGT_XMIT_STATUS) {
2072                                 pkt->u.status0.scsi_status =
2073                                     cpu_to_le16(prm.rq_result);
2074                                 pkt->u.status0.residual =
2075                                     cpu_to_le32(prm.residual);
2076                                 pkt->u.status0.flags |= __constant_cpu_to_le16(
2077                                     CTIO7_FLAGS_SEND_STATUS);
2078                                 if (qlt_need_explicit_conf(ha, cmd, 0)) {
2079                                         pkt->u.status0.flags |=
2080                                             __constant_cpu_to_le16(
2081                                                 CTIO7_FLAGS_EXPLICIT_CONFORM |
2082                                                 CTIO7_FLAGS_CONFORM_REQ);
2083                                 }
2084                         }
2085
2086                 } else {
2087                         /*
2088                          * We have already made sure that there is sufficient
2089                          * amount of request entries to not drop HW lock in
2090                          * req_pkt().
2091                          */
2092                         struct ctio7_to_24xx *ctio =
2093                                 (struct ctio7_to_24xx *)qlt_get_req_pkt(vha);
2094
2095                         ql_dbg(ql_dbg_tgt, vha, 0xe019,
2096                             "Building additional status packet\n");
2097
2098                         memcpy(ctio, pkt, sizeof(*ctio));
2099                         ctio->entry_count = 1;
2100                         ctio->dseg_count = 0;
2101                         ctio->u.status1.flags &= ~__constant_cpu_to_le16(
2102                             CTIO7_FLAGS_DATA_IN);
2103
2104                         /* Real finish is ctio_m1's finish */
2105                         pkt->handle |= CTIO_INTERMEDIATE_HANDLE_MARK;
2106                         pkt->u.status0.flags |= __constant_cpu_to_le16(
2107                             CTIO7_FLAGS_DONT_RET_CTIO);
2108                         qlt_24xx_init_ctio_to_isp((struct ctio7_to_24xx *)ctio,
2109                             &prm);
2110                         pr_debug("Status CTIO7: %p\n", ctio);
2111                 }
2112         } else
2113                 qlt_24xx_init_ctio_to_isp(pkt, &prm);
2114
2115
2116         cmd->state = QLA_TGT_STATE_PROCESSED; /* Mid-level is done processing */
2117
2118         ql_dbg(ql_dbg_tgt, vha, 0xe01a,
2119             "Xmitting CTIO7 response pkt for 24xx: %p scsi_status: 0x%02x\n",
2120             pkt, scsi_status);
2121
2122         qla2x00_start_iocbs(vha, vha->req);
2123         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2124
2125         return 0;
2126
2127 out_unmap_unlock:
2128         if (cmd->sg_mapped)
2129                 qlt_unmap_sg(vha, cmd);
2130         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2131
2132         return res;
2133 }
2134 EXPORT_SYMBOL(qlt_xmit_response);
2135
2136 int qlt_rdy_to_xfer(struct qla_tgt_cmd *cmd)
2137 {
2138         struct ctio7_to_24xx *pkt;
2139         struct scsi_qla_host *vha = cmd->vha;
2140         struct qla_hw_data *ha = vha->hw;
2141         struct qla_tgt *tgt = cmd->tgt;
2142         struct qla_tgt_prm prm;
2143         unsigned long flags;
2144         int res = 0;
2145
2146         memset(&prm, 0, sizeof(prm));
2147         prm.cmd = cmd;
2148         prm.tgt = tgt;
2149         prm.sg = NULL;
2150         prm.req_cnt = 1;
2151
2152         /* Send marker if required */
2153         if (qlt_issue_marker(vha, 0) != QLA_SUCCESS)
2154                 return -EIO;
2155
2156         ql_dbg(ql_dbg_tgt, vha, 0xe01b, "CTIO_start: vha(%d)",
2157             (int)vha->vp_idx);
2158
2159         /* Calculate number of entries and segments required */
2160         if (qlt_pci_map_calc_cnt(&prm) != 0)
2161                 return -EAGAIN;
2162
2163         spin_lock_irqsave(&ha->hardware_lock, flags);
2164
2165         /* Does F/W have an IOCBs for this request */
2166         res = qlt_check_reserve_free_req(vha, prm.req_cnt);
2167         if (res != 0)
2168                 goto out_unlock_free_unmap;
2169
2170         res = qlt_24xx_build_ctio_pkt(&prm, vha);
2171         if (unlikely(res != 0))
2172                 goto out_unlock_free_unmap;
2173         pkt = (struct ctio7_to_24xx *)prm.pkt;
2174         pkt->u.status0.flags |= __constant_cpu_to_le16(CTIO7_FLAGS_DATA_OUT |
2175             CTIO7_FLAGS_STATUS_MODE_0);
2176         qlt_load_data_segments(&prm, vha);
2177
2178         cmd->state = QLA_TGT_STATE_NEED_DATA;
2179
2180         qla2x00_start_iocbs(vha, vha->req);
2181         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2182
2183         return res;
2184
2185 out_unlock_free_unmap:
2186         if (cmd->sg_mapped)
2187                 qlt_unmap_sg(vha, cmd);
2188         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2189
2190         return res;
2191 }
2192 EXPORT_SYMBOL(qlt_rdy_to_xfer);
2193
2194 /* If hardware_lock held on entry, might drop it, then reaquire */
2195 /* This function sends the appropriate CTIO to ISP 2xxx or 24xx */
2196 static int __qlt_send_term_exchange(struct scsi_qla_host *vha,
2197         struct qla_tgt_cmd *cmd,
2198         struct atio_from_isp *atio)
2199 {
2200         struct ctio7_to_24xx *ctio24;
2201         struct qla_hw_data *ha = vha->hw;
2202         request_t *pkt;
2203         int ret = 0;
2204
2205         ql_dbg(ql_dbg_tgt, vha, 0xe01c, "Sending TERM EXCH CTIO (ha=%p)\n", ha);
2206
2207         pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
2208         if (pkt == NULL) {
2209                 ql_dbg(ql_dbg_tgt, vha, 0xe050,
2210                     "qla_target(%d): %s failed: unable to allocate "
2211                     "request packet\n", vha->vp_idx, __func__);
2212                 return -ENOMEM;
2213         }
2214
2215         if (cmd != NULL) {
2216                 if (cmd->state < QLA_TGT_STATE_PROCESSED) {
2217                         ql_dbg(ql_dbg_tgt, vha, 0xe051,
2218                             "qla_target(%d): Terminating cmd %p with "
2219                             "incorrect state %d\n", vha->vp_idx, cmd,
2220                             cmd->state);
2221                 } else
2222                         ret = 1;
2223         }
2224
2225         pkt->entry_count = 1;
2226         pkt->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
2227
2228         ctio24 = (struct ctio7_to_24xx *)pkt;
2229         ctio24->entry_type = CTIO_TYPE7;
2230         ctio24->nport_handle = cmd ? cmd->loop_id : CTIO7_NHANDLE_UNRECOGNIZED;
2231         ctio24->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
2232         ctio24->vp_index = vha->vp_idx;
2233         ctio24->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
2234         ctio24->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
2235         ctio24->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
2236         ctio24->exchange_addr = atio->u.isp24.exchange_addr;
2237         ctio24->u.status1.flags = (atio->u.isp24.attr << 9) |
2238             __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
2239                 CTIO7_FLAGS_TERMINATE);
2240         ctio24->u.status1.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
2241
2242         /* Most likely, it isn't needed */
2243         ctio24->u.status1.residual = get_unaligned((uint32_t *)
2244             &atio->u.isp24.fcp_cmnd.add_cdb[
2245             atio->u.isp24.fcp_cmnd.add_cdb_len]);
2246         if (ctio24->u.status1.residual != 0)
2247                 ctio24->u.status1.scsi_status |= SS_RESIDUAL_UNDER;
2248
2249         qla2x00_start_iocbs(vha, vha->req);
2250         return ret;
2251 }
2252
2253 static void qlt_send_term_exchange(struct scsi_qla_host *vha,
2254         struct qla_tgt_cmd *cmd, struct atio_from_isp *atio, int ha_locked)
2255 {
2256         unsigned long flags;
2257         int rc;
2258
2259         if (qlt_issue_marker(vha, ha_locked) < 0)
2260                 return;
2261
2262         if (ha_locked) {
2263                 rc = __qlt_send_term_exchange(vha, cmd, atio);
2264                 goto done;
2265         }
2266         spin_lock_irqsave(&vha->hw->hardware_lock, flags);
2267         rc = __qlt_send_term_exchange(vha, cmd, atio);
2268         spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
2269 done:
2270         if (rc == 1) {
2271                 if (!ha_locked && !in_interrupt())
2272                         msleep(250); /* just in case */
2273
2274                 vha->hw->tgt.tgt_ops->free_cmd(cmd);
2275         }
2276 }
2277
2278 void qlt_free_cmd(struct qla_tgt_cmd *cmd)
2279 {
2280         BUG_ON(cmd->sg_mapped);
2281
2282         if (unlikely(cmd->free_sg))
2283                 kfree(cmd->sg);
2284         kmem_cache_free(qla_tgt_cmd_cachep, cmd);
2285 }
2286 EXPORT_SYMBOL(qlt_free_cmd);
2287
2288 /* ha->hardware_lock supposed to be held on entry */
2289 static int qlt_prepare_srr_ctio(struct scsi_qla_host *vha,
2290         struct qla_tgt_cmd *cmd, void *ctio)
2291 {
2292         struct qla_tgt_srr_ctio *sc;
2293         struct qla_hw_data *ha = vha->hw;
2294         struct qla_tgt *tgt = ha->tgt.qla_tgt;
2295         struct qla_tgt_srr_imm *imm;
2296
2297         tgt->ctio_srr_id++;
2298
2299         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf019,
2300             "qla_target(%d): CTIO with SRR status received\n", vha->vp_idx);
2301
2302         if (!ctio) {
2303                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf055,
2304                     "qla_target(%d): SRR CTIO, but ctio is NULL\n",
2305                     vha->vp_idx);
2306                 return -EINVAL;
2307         }
2308
2309         sc = kzalloc(sizeof(*sc), GFP_ATOMIC);
2310         if (sc != NULL) {
2311                 sc->cmd = cmd;
2312                 /* IRQ is already OFF */
2313                 spin_lock(&tgt->srr_lock);
2314                 sc->srr_id = tgt->ctio_srr_id;
2315                 list_add_tail(&sc->srr_list_entry,
2316                     &tgt->srr_ctio_list);
2317                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01a,
2318                     "CTIO SRR %p added (id %d)\n", sc, sc->srr_id);
2319                 if (tgt->imm_srr_id == tgt->ctio_srr_id) {
2320                         int found = 0;
2321                         list_for_each_entry(imm, &tgt->srr_imm_list,
2322                             srr_list_entry) {
2323                                 if (imm->srr_id == sc->srr_id) {
2324                                         found = 1;
2325                                         break;
2326                                 }
2327                         }
2328                         if (found) {
2329                                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01b,
2330                                     "Scheduling srr work\n");
2331                                 schedule_work(&tgt->srr_work);
2332                         } else {
2333                                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf056,
2334                                     "qla_target(%d): imm_srr_id "
2335                                     "== ctio_srr_id (%d), but there is no "
2336                                     "corresponding SRR IMM, deleting CTIO "
2337                                     "SRR %p\n", vha->vp_idx,
2338                                     tgt->ctio_srr_id, sc);
2339                                 list_del(&sc->srr_list_entry);
2340                                 spin_unlock(&tgt->srr_lock);
2341
2342                                 kfree(sc);
2343                                 return -EINVAL;
2344                         }
2345                 }
2346                 spin_unlock(&tgt->srr_lock);
2347         } else {
2348                 struct qla_tgt_srr_imm *ti;
2349
2350                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf057,
2351                     "qla_target(%d): Unable to allocate SRR CTIO entry\n",
2352                     vha->vp_idx);
2353                 spin_lock(&tgt->srr_lock);
2354                 list_for_each_entry_safe(imm, ti, &tgt->srr_imm_list,
2355                     srr_list_entry) {
2356                         if (imm->srr_id == tgt->ctio_srr_id) {
2357                                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01c,
2358                                     "IMM SRR %p deleted (id %d)\n",
2359                                     imm, imm->srr_id);
2360                                 list_del(&imm->srr_list_entry);
2361                                 qlt_reject_free_srr_imm(vha, imm, 1);
2362                         }
2363                 }
2364                 spin_unlock(&tgt->srr_lock);
2365
2366                 return -ENOMEM;
2367         }
2368
2369         return 0;
2370 }
2371
2372 /*
2373  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
2374  */
2375 static int qlt_term_ctio_exchange(struct scsi_qla_host *vha, void *ctio,
2376         struct qla_tgt_cmd *cmd, uint32_t status)
2377 {
2378         int term = 0;
2379
2380         if (ctio != NULL) {
2381                 struct ctio7_from_24xx *c = (struct ctio7_from_24xx *)ctio;
2382                 term = !(c->flags &
2383                     __constant_cpu_to_le16(OF_TERM_EXCH));
2384         } else
2385                 term = 1;
2386
2387         if (term)
2388                 qlt_send_term_exchange(vha, cmd, &cmd->atio, 1);
2389
2390         return term;
2391 }
2392
2393 /* ha->hardware_lock supposed to be held on entry */
2394 static inline struct qla_tgt_cmd *qlt_get_cmd(struct scsi_qla_host *vha,
2395         uint32_t handle)
2396 {
2397         struct qla_hw_data *ha = vha->hw;
2398
2399         handle--;
2400         if (ha->tgt.cmds[handle] != NULL) {
2401                 struct qla_tgt_cmd *cmd = ha->tgt.cmds[handle];
2402                 ha->tgt.cmds[handle] = NULL;
2403                 return cmd;
2404         } else
2405                 return NULL;
2406 }
2407
2408 /* ha->hardware_lock supposed to be held on entry */
2409 static struct qla_tgt_cmd *qlt_ctio_to_cmd(struct scsi_qla_host *vha,
2410         uint32_t handle, void *ctio)
2411 {
2412         struct qla_tgt_cmd *cmd = NULL;
2413
2414         /* Clear out internal marks */
2415         handle &= ~(CTIO_COMPLETION_HANDLE_MARK |
2416             CTIO_INTERMEDIATE_HANDLE_MARK);
2417
2418         if (handle != QLA_TGT_NULL_HANDLE) {
2419                 if (unlikely(handle == QLA_TGT_SKIP_HANDLE)) {
2420                         ql_dbg(ql_dbg_tgt, vha, 0xe01d, "%s",
2421                             "SKIP_HANDLE CTIO\n");
2422                         return NULL;
2423                 }
2424                 /* handle-1 is actually used */
2425                 if (unlikely(handle > MAX_OUTSTANDING_COMMANDS)) {
2426                         ql_dbg(ql_dbg_tgt, vha, 0xe052,
2427                             "qla_target(%d): Wrong handle %x received\n",
2428                             vha->vp_idx, handle);
2429                         return NULL;
2430                 }
2431                 cmd = qlt_get_cmd(vha, handle);
2432                 if (unlikely(cmd == NULL)) {
2433                         ql_dbg(ql_dbg_tgt, vha, 0xe053,
2434                             "qla_target(%d): Suspicious: unable to "
2435                             "find the command with handle %x\n", vha->vp_idx,
2436                             handle);
2437                         return NULL;
2438                 }
2439         } else if (ctio != NULL) {
2440                 /* We can't get loop ID from CTIO7 */
2441                 ql_dbg(ql_dbg_tgt, vha, 0xe054,
2442                     "qla_target(%d): Wrong CTIO received: QLA24xx doesn't "
2443                     "support NULL handles\n", vha->vp_idx);
2444                 return NULL;
2445         }
2446
2447         return cmd;
2448 }
2449
2450 /*
2451  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
2452  */
2453 static void qlt_do_ctio_completion(struct scsi_qla_host *vha, uint32_t handle,
2454         uint32_t status, void *ctio)
2455 {
2456         struct qla_hw_data *ha = vha->hw;
2457         struct se_cmd *se_cmd;
2458         struct target_core_fabric_ops *tfo;
2459         struct qla_tgt_cmd *cmd;
2460
2461         ql_dbg(ql_dbg_tgt, vha, 0xe01e,
2462             "qla_target(%d): handle(ctio %p status %#x) <- %08x\n",
2463             vha->vp_idx, ctio, status, handle);
2464
2465         if (handle & CTIO_INTERMEDIATE_HANDLE_MARK) {
2466                 /* That could happen only in case of an error/reset/abort */
2467                 if (status != CTIO_SUCCESS) {
2468                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01d,
2469                             "Intermediate CTIO received"
2470                             " (status %x)\n", status);
2471                 }
2472                 return;
2473         }
2474
2475         cmd = qlt_ctio_to_cmd(vha, handle, ctio);
2476         if (cmd == NULL)
2477                 return;
2478
2479         se_cmd = &cmd->se_cmd;
2480         tfo = se_cmd->se_tfo;
2481
2482         if (cmd->sg_mapped)
2483                 qlt_unmap_sg(vha, cmd);
2484
2485         if (unlikely(status != CTIO_SUCCESS)) {
2486                 switch (status & 0xFFFF) {
2487                 case CTIO_LIP_RESET:
2488                 case CTIO_TARGET_RESET:
2489                 case CTIO_ABORTED:
2490                 case CTIO_TIMEOUT:
2491                 case CTIO_INVALID_RX_ID:
2492                         /* They are OK */
2493                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf058,
2494                             "qla_target(%d): CTIO with "
2495                             "status %#x received, state %x, se_cmd %p, "
2496                             "(LIP_RESET=e, ABORTED=2, TARGET_RESET=17, "
2497                             "TIMEOUT=b, INVALID_RX_ID=8)\n", vha->vp_idx,
2498                             status, cmd->state, se_cmd);
2499                         break;
2500
2501                 case CTIO_PORT_LOGGED_OUT:
2502                 case CTIO_PORT_UNAVAILABLE:
2503                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf059,
2504                             "qla_target(%d): CTIO with PORT LOGGED "
2505                             "OUT (29) or PORT UNAVAILABLE (28) status %x "
2506                             "received (state %x, se_cmd %p)\n", vha->vp_idx,
2507                             status, cmd->state, se_cmd);
2508                         break;
2509
2510                 case CTIO_SRR_RECEIVED:
2511                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05a,
2512                             "qla_target(%d): CTIO with SRR_RECEIVED"
2513                             " status %x received (state %x, se_cmd %p)\n",
2514                             vha->vp_idx, status, cmd->state, se_cmd);
2515                         if (qlt_prepare_srr_ctio(vha, cmd, ctio) != 0)
2516                                 break;
2517                         else
2518                                 return;
2519
2520                 default:
2521                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05b,
2522                             "qla_target(%d): CTIO with error status "
2523                             "0x%x received (state %x, se_cmd %p\n",
2524                             vha->vp_idx, status, cmd->state, se_cmd);
2525                         break;
2526                 }
2527
2528                 if (cmd->state != QLA_TGT_STATE_NEED_DATA)
2529                         if (qlt_term_ctio_exchange(vha, ctio, cmd, status))
2530                                 return;
2531         }
2532
2533         if (cmd->state == QLA_TGT_STATE_PROCESSED) {
2534                 ql_dbg(ql_dbg_tgt, vha, 0xe01f, "Command %p finished\n", cmd);
2535         } else if (cmd->state == QLA_TGT_STATE_NEED_DATA) {
2536                 int rx_status = 0;
2537
2538                 cmd->state = QLA_TGT_STATE_DATA_IN;
2539
2540                 if (unlikely(status != CTIO_SUCCESS))
2541                         rx_status = -EIO;
2542                 else
2543                         cmd->write_data_transferred = 1;
2544
2545                 ql_dbg(ql_dbg_tgt, vha, 0xe020,
2546                     "Data received, context %x, rx_status %d\n",
2547                     0x0, rx_status);
2548
2549                 ha->tgt.tgt_ops->handle_data(cmd);
2550                 return;
2551         } else if (cmd->state == QLA_TGT_STATE_ABORTED) {
2552                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01e,
2553                     "Aborted command %p (tag %d) finished\n", cmd, cmd->tag);
2554         } else {
2555                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05c,
2556                     "qla_target(%d): A command in state (%d) should "
2557                     "not return a CTIO complete\n", vha->vp_idx, cmd->state);
2558         }
2559
2560         if (unlikely(status != CTIO_SUCCESS)) {
2561                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01f, "Finishing failed CTIO\n");
2562                 dump_stack();
2563         }
2564
2565         ha->tgt.tgt_ops->free_cmd(cmd);
2566 }
2567
2568 /* ha->hardware_lock supposed to be held on entry */
2569 /* called via callback from qla2xxx */
2570 void qlt_ctio_completion(struct scsi_qla_host *vha, uint32_t handle)
2571 {
2572         struct qla_hw_data *ha = vha->hw;
2573         struct qla_tgt *tgt = ha->tgt.qla_tgt;
2574
2575         if (likely(tgt == NULL)) {
2576                 ql_dbg(ql_dbg_tgt, vha, 0xe021,
2577                     "CTIO, but target mode not enabled"
2578                     " (ha %d %p handle %#x)", vha->vp_idx, ha, handle);
2579                 return;
2580         }
2581
2582         tgt->irq_cmd_count++;
2583         qlt_do_ctio_completion(vha, handle, CTIO_SUCCESS, NULL);
2584         tgt->irq_cmd_count--;
2585 }
2586
2587 static inline int qlt_get_fcp_task_attr(struct scsi_qla_host *vha,
2588         uint8_t task_codes)
2589 {
2590         int fcp_task_attr;
2591
2592         switch (task_codes) {
2593         case ATIO_SIMPLE_QUEUE:
2594                 fcp_task_attr = MSG_SIMPLE_TAG;
2595                 break;
2596         case ATIO_HEAD_OF_QUEUE:
2597                 fcp_task_attr = MSG_HEAD_TAG;
2598                 break;
2599         case ATIO_ORDERED_QUEUE:
2600                 fcp_task_attr = MSG_ORDERED_TAG;
2601                 break;
2602         case ATIO_ACA_QUEUE:
2603                 fcp_task_attr = MSG_ACA_TAG;
2604                 break;
2605         case ATIO_UNTAGGED:
2606                 fcp_task_attr = MSG_SIMPLE_TAG;
2607                 break;
2608         default:
2609                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05d,
2610                     "qla_target: unknown task code %x, use ORDERED instead\n",
2611                     task_codes);
2612                 fcp_task_attr = MSG_ORDERED_TAG;
2613                 break;
2614         }
2615
2616         return fcp_task_attr;
2617 }
2618
2619 static struct qla_tgt_sess *qlt_make_local_sess(struct scsi_qla_host *,
2620                                         uint8_t *);
2621 /*
2622  * Process context for I/O path into tcm_qla2xxx code
2623  */
2624 static void qlt_do_work(struct work_struct *work)
2625 {
2626         struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
2627         scsi_qla_host_t *vha = cmd->vha;
2628         struct qla_hw_data *ha = vha->hw;
2629         struct qla_tgt *tgt = ha->tgt.qla_tgt;
2630         struct qla_tgt_sess *sess = NULL;
2631         struct atio_from_isp *atio = &cmd->atio;
2632         unsigned char *cdb;
2633         unsigned long flags;
2634         uint32_t data_length;
2635         int ret, fcp_task_attr, data_dir, bidi = 0;
2636
2637         if (tgt->tgt_stop)
2638                 goto out_term;
2639
2640         spin_lock_irqsave(&ha->hardware_lock, flags);
2641         sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
2642             atio->u.isp24.fcp_hdr.s_id);
2643         /* Do kref_get() before dropping qla_hw_data->hardware_lock. */
2644         if (sess)
2645                 kref_get(&sess->se_sess->sess_kref);
2646         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2647
2648         if (unlikely(!sess)) {
2649                 uint8_t *s_id = atio->u.isp24.fcp_hdr.s_id;
2650
2651                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf022,
2652                         "qla_target(%d): Unable to find wwn login"
2653                         " (s_id %x:%x:%x), trying to create it manually\n",
2654                         vha->vp_idx, s_id[0], s_id[1], s_id[2]);
2655
2656                 if (atio->u.raw.entry_count > 1) {
2657                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf023,
2658                                 "Dropping multy entry cmd %p\n", cmd);
2659                         goto out_term;
2660                 }
2661
2662                 mutex_lock(&ha->tgt.tgt_mutex);
2663                 sess = qlt_make_local_sess(vha, s_id);
2664                 /* sess has an extra creation ref. */
2665                 mutex_unlock(&ha->tgt.tgt_mutex);
2666
2667                 if (!sess)
2668                         goto out_term;
2669         }
2670
2671         cmd->sess = sess;
2672         cmd->loop_id = sess->loop_id;
2673         cmd->conf_compl_supported = sess->conf_compl_supported;
2674
2675         cdb = &atio->u.isp24.fcp_cmnd.cdb[0];
2676         cmd->tag = atio->u.isp24.exchange_addr;
2677         cmd->unpacked_lun = scsilun_to_int(
2678             (struct scsi_lun *)&atio->u.isp24.fcp_cmnd.lun);
2679
2680         if (atio->u.isp24.fcp_cmnd.rddata &&
2681             atio->u.isp24.fcp_cmnd.wrdata) {
2682                 bidi = 1;
2683                 data_dir = DMA_TO_DEVICE;
2684         } else if (atio->u.isp24.fcp_cmnd.rddata)
2685                 data_dir = DMA_FROM_DEVICE;
2686         else if (atio->u.isp24.fcp_cmnd.wrdata)
2687                 data_dir = DMA_TO_DEVICE;
2688         else
2689                 data_dir = DMA_NONE;
2690
2691         fcp_task_attr = qlt_get_fcp_task_attr(vha,
2692             atio->u.isp24.fcp_cmnd.task_attr);
2693         data_length = be32_to_cpu(get_unaligned((uint32_t *)
2694             &atio->u.isp24.fcp_cmnd.add_cdb[
2695             atio->u.isp24.fcp_cmnd.add_cdb_len]));
2696
2697         ql_dbg(ql_dbg_tgt, vha, 0xe022,
2698             "qla_target: START qla command: %p lun: 0x%04x (tag %d)\n",
2699             cmd, cmd->unpacked_lun, cmd->tag);
2700
2701         ret = vha->hw->tgt.tgt_ops->handle_cmd(vha, cmd, cdb, data_length,
2702             fcp_task_attr, data_dir, bidi);
2703         if (ret != 0)
2704                 goto out_term;
2705         /*
2706          * Drop extra session reference from qla_tgt_handle_cmd_for_atio*(
2707          */
2708         ha->tgt.tgt_ops->put_sess(sess);
2709         return;
2710
2711 out_term:
2712         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf020, "Terminating work cmd %p", cmd);
2713         /*
2714          * cmd has not sent to target yet, so pass NULL as the second
2715          * argument to qlt_send_term_exchange() and free the memory here.
2716          */
2717         spin_lock_irqsave(&ha->hardware_lock, flags);
2718         qlt_send_term_exchange(vha, NULL, &cmd->atio, 1);
2719         kmem_cache_free(qla_tgt_cmd_cachep, cmd);
2720         spin_unlock_irqrestore(&ha->hardware_lock, flags);
2721         if (sess)
2722                 ha->tgt.tgt_ops->put_sess(sess);
2723 }
2724
2725 /* ha->hardware_lock supposed to be held on entry */
2726 static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
2727         struct atio_from_isp *atio)
2728 {
2729         struct qla_hw_data *ha = vha->hw;
2730         struct qla_tgt *tgt = ha->tgt.qla_tgt;
2731         struct qla_tgt_cmd *cmd;
2732
2733         if (unlikely(tgt->tgt_stop)) {
2734                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf021,
2735                     "New command while device %p is shutting down\n", tgt);
2736                 return -EFAULT;
2737         }
2738
2739         cmd = kmem_cache_zalloc(qla_tgt_cmd_cachep, GFP_ATOMIC);
2740         if (!cmd) {
2741                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05e,
2742                     "qla_target(%d): Allocation of cmd failed\n", vha->vp_idx);
2743                 return -ENOMEM;
2744         }
2745
2746         INIT_LIST_HEAD(&cmd->cmd_list);
2747
2748         memcpy(&cmd->atio, atio, sizeof(*atio));
2749         cmd->state = QLA_TGT_STATE_NEW;
2750         cmd->tgt = ha->tgt.qla_tgt;
2751         cmd->vha = vha;
2752
2753         INIT_WORK(&cmd->work, qlt_do_work);
2754         queue_work(qla_tgt_wq, &cmd->work);
2755         return 0;
2756
2757 }
2758
2759 /* ha->hardware_lock supposed to be held on entry */
2760 static int qlt_issue_task_mgmt(struct qla_tgt_sess *sess, uint32_t lun,
2761         int fn, void *iocb, int flags)
2762 {
2763         struct scsi_qla_host *vha = sess->vha;
2764         struct qla_hw_data *ha = vha->hw;
2765         struct qla_tgt_mgmt_cmd *mcmd;
2766         int res;
2767         uint8_t tmr_func;
2768
2769         mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
2770         if (!mcmd) {
2771                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10009,
2772                     "qla_target(%d): Allocation of management "
2773                     "command failed, some commands and their data could "
2774                     "leak\n", vha->vp_idx);
2775                 return -ENOMEM;
2776         }
2777         memset(mcmd, 0, sizeof(*mcmd));
2778         mcmd->sess = sess;
2779
2780         if (iocb) {
2781                 memcpy(&mcmd->orig_iocb.imm_ntfy, iocb,
2782                     sizeof(mcmd->orig_iocb.imm_ntfy));
2783         }
2784         mcmd->tmr_func = fn;
2785         mcmd->flags = flags;
2786
2787         switch (fn) {
2788         case QLA_TGT_CLEAR_ACA:
2789                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10000,
2790                     "qla_target(%d): CLEAR_ACA received\n", sess->vha->vp_idx);
2791                 tmr_func = TMR_CLEAR_ACA;
2792                 break;
2793
2794         case QLA_TGT_TARGET_RESET:
2795                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10001,
2796                     "qla_target(%d): TARGET_RESET received\n",
2797                     sess->vha->vp_idx);
2798                 tmr_func = TMR_TARGET_WARM_RESET;
2799                 break;
2800
2801         case QLA_TGT_LUN_RESET:
2802                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10002,
2803                     "qla_target(%d): LUN_RESET received\n", sess->vha->vp_idx);
2804                 tmr_func = TMR_LUN_RESET;
2805                 break;
2806
2807         case QLA_TGT_CLEAR_TS:
2808                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10003,
2809                     "qla_target(%d): CLEAR_TS received\n", sess->vha->vp_idx);
2810                 tmr_func = TMR_CLEAR_TASK_SET;
2811                 break;
2812
2813         case QLA_TGT_ABORT_TS:
2814                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10004,
2815                     "qla_target(%d): ABORT_TS received\n", sess->vha->vp_idx);
2816                 tmr_func = TMR_ABORT_TASK_SET;
2817                 break;
2818 #if 0
2819         case QLA_TGT_ABORT_ALL:
2820                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10005,
2821                     "qla_target(%d): Doing ABORT_ALL_TASKS\n",
2822                     sess->vha->vp_idx);
2823                 tmr_func = 0;
2824                 break;
2825
2826         case QLA_TGT_ABORT_ALL_SESS:
2827                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10006,
2828                     "qla_target(%d): Doing ABORT_ALL_TASKS_SESS\n",
2829                     sess->vha->vp_idx);
2830                 tmr_func = 0;
2831                 break;
2832
2833         case QLA_TGT_NEXUS_LOSS_SESS:
2834                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10007,
2835                     "qla_target(%d): Doing NEXUS_LOSS_SESS\n",
2836                     sess->vha->vp_idx);
2837                 tmr_func = 0;
2838                 break;
2839
2840         case QLA_TGT_NEXUS_LOSS:
2841                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x10008,
2842                     "qla_target(%d): Doing NEXUS_LOSS\n", sess->vha->vp_idx);
2843                 tmr_func = 0;
2844                 break;
2845 #endif
2846         default:
2847                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x1000a,
2848                     "qla_target(%d): Unknown task mgmt fn 0x%x\n",
2849                     sess->vha->vp_idx, fn);
2850                 mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
2851                 return -ENOSYS;
2852         }
2853
2854         res = ha->tgt.tgt_ops->handle_tmr(mcmd, lun, tmr_func, 0);
2855         if (res != 0) {
2856                 ql_dbg(ql_dbg_tgt_tmr, vha, 0x1000b,
2857                     "qla_target(%d): tgt.tgt_ops->handle_tmr() failed: %d\n",
2858                     sess->vha->vp_idx, res);
2859                 mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
2860                 return -EFAULT;
2861         }
2862
2863         return 0;
2864 }
2865
2866 /* ha->hardware_lock supposed to be held on entry */
2867 static int qlt_handle_task_mgmt(struct scsi_qla_host *vha, void *iocb)
2868 {
2869         struct atio_from_isp *a = (struct atio_from_isp *)iocb;
2870         struct qla_hw_data *ha = vha->hw;
2871         struct qla_tgt *tgt;
2872         struct qla_tgt_sess *sess;
2873         uint32_t lun, unpacked_lun;
2874         int lun_size, fn;
2875
2876         tgt = ha->tgt.qla_tgt;
2877
2878         lun = a->u.isp24.fcp_cmnd.lun;
2879         lun_size = sizeof(a->u.isp24.fcp_cmnd.lun);
2880         fn = a->u.isp24.fcp_cmnd.task_mgmt_flags;
2881         sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
2882             a->u.isp24.fcp_hdr.s_id);
2883         unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2884
2885         if (!sess) {
2886                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf024,
2887                     "qla_target(%d): task mgmt fn 0x%x for "
2888                     "non-existant session\n", vha->vp_idx, fn);
2889                 return qlt_sched_sess_work(tgt, QLA_TGT_SESS_WORK_TM, iocb,
2890                     sizeof(struct atio_from_isp));
2891         }
2892
2893         return qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
2894 }
2895
2896 /* ha->hardware_lock supposed to be held on entry */
2897 static int __qlt_abort_task(struct scsi_qla_host *vha,
2898         struct imm_ntfy_from_isp *iocb, struct qla_tgt_sess *sess)
2899 {
2900         struct atio_from_isp *a = (struct atio_from_isp *)iocb;
2901         struct qla_hw_data *ha = vha->hw;
2902         struct qla_tgt_mgmt_cmd *mcmd;
2903         uint32_t lun, unpacked_lun;
2904         int rc;
2905
2906         mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
2907         if (mcmd == NULL) {
2908                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05f,
2909                     "qla_target(%d): %s: Allocation of ABORT cmd failed\n",
2910                     vha->vp_idx, __func__);
2911                 return -ENOMEM;
2912         }
2913         memset(mcmd, 0, sizeof(*mcmd));
2914
2915         mcmd->sess = sess;
2916         memcpy(&mcmd->orig_iocb.imm_ntfy, iocb,
2917             sizeof(mcmd->orig_iocb.imm_ntfy));
2918
2919         lun = a->u.isp24.fcp_cmnd.lun;
2920         unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
2921
2922         rc = ha->tgt.tgt_ops->handle_tmr(mcmd, unpacked_lun, TMR_ABORT_TASK,
2923             le16_to_cpu(iocb->u.isp2x.seq_id));
2924         if (rc != 0) {
2925                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf060,
2926                     "qla_target(%d): tgt_ops->handle_tmr() failed: %d\n",
2927                     vha->vp_idx, rc);
2928                 mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
2929                 return -EFAULT;
2930         }
2931
2932         return 0;
2933 }
2934
2935 /* ha->hardware_lock supposed to be held on entry */
2936 static int qlt_abort_task(struct scsi_qla_host *vha,
2937         struct imm_ntfy_from_isp *iocb)
2938 {
2939         struct qla_hw_data *ha = vha->hw;
2940         struct qla_tgt_sess *sess;
2941         int loop_id;
2942
2943         loop_id = GET_TARGET_ID(ha, (struct atio_from_isp *)iocb);
2944
2945         sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
2946         if (sess == NULL) {
2947                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf025,
2948                     "qla_target(%d): task abort for unexisting "
2949                     "session\n", vha->vp_idx);
2950                 return qlt_sched_sess_work(ha->tgt.qla_tgt,
2951                     QLA_TGT_SESS_WORK_ABORT, iocb, sizeof(*iocb));
2952         }
2953
2954         return __qlt_abort_task(vha, iocb, sess);
2955 }
2956
2957 /*
2958  * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
2959  */
2960 static int qlt_24xx_handle_els(struct scsi_qla_host *vha,
2961         struct imm_ntfy_from_isp *iocb)
2962 {
2963         struct qla_hw_data *ha = vha->hw;
2964         int res = 0;
2965
2966         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf026,
2967             "qla_target(%d): Port ID: 0x%02x:%02x:%02x"
2968             " ELS opcode: 0x%02x\n", vha->vp_idx, iocb->u.isp24.port_id[0],
2969             iocb->u.isp24.port_id[1], iocb->u.isp24.port_id[2],
2970             iocb->u.isp24.status_subcode);
2971
2972         switch (iocb->u.isp24.status_subcode) {
2973         case ELS_PLOGI:
2974         case ELS_FLOGI:
2975         case ELS_PRLI:
2976         case ELS_LOGO:
2977         case ELS_PRLO:
2978                 res = qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS);
2979                 break;
2980         case ELS_PDISC:
2981         case ELS_ADISC:
2982         {
2983                 struct qla_tgt *tgt = ha->tgt.qla_tgt;
2984                 if (tgt->link_reinit_iocb_pending) {
2985                         qlt_send_notify_ack(vha, &tgt->link_reinit_iocb,
2986                             0, 0, 0, 0, 0, 0);
2987                         tgt->link_reinit_iocb_pending = 0;
2988                 }
2989                 res = 1; /* send notify ack */
2990                 break;
2991         }
2992
2993         default:
2994                 ql_dbg(ql_dbg_tgt_mgt, vha, 0xf061,
2995                     "qla_target(%d): Unsupported ELS command %x "
2996                     "received\n", vha->vp_idx, iocb->u.isp24.status_subcode);
2997                 res = qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS);
2998                 break;
2999         }
3000
3001         return res;
3002 }
3003
3004 static int qlt_set_data_offset(struct qla_tgt_cmd *cmd, uint32_t offset)
3005 {
3006         struct scatterlist *sg, *sgp, *sg_srr, *sg_srr_start = NULL;
3007         size_t first_offset = 0, rem_offset = offset, tmp = 0;
3008         int i, sg_srr_cnt, bufflen = 0;
3009
3010         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe023,
3011             "Entering qla_tgt_set_data_offset: cmd: %p, cmd->sg: %p, "
3012             "cmd->sg_cnt: %u, direction: %d\n",
3013             cmd, cmd->sg, cmd->sg_cnt, cmd->dma_data_direction);
3014
3015         /*
3016          * FIXME: Reject non zero SRR relative offset until we can test
3017          * this code properly.
3018          */
3019         pr_debug("Rejecting non zero SRR rel_offs: %u\n", offset);
3020         return -1;
3021
3022         if (!cmd->sg || !cmd->sg_cnt) {
3023                 ql_dbg(ql_dbg_tgt, cmd->vha, 0xe055,
3024                     "Missing cmd->sg or zero cmd->sg_cnt in"
3025                     " qla_tgt_set_data_offset\n");
3026                 return -EINVAL;
3027         }
3028         /*
3029          * Walk the current cmd->sg list until we locate the new sg_srr_start
3030          */
3031         for_each_sg(cmd->sg, sg, cmd->sg_cnt, i) {
3032                 ql_dbg(ql_dbg_tgt, cmd->vha, 0xe024,
3033                     "sg[%d]: %p page: %p, length: %d, offset: %d\n",
3034                     i, sg, sg_page(sg), sg->length, sg->offset);
3035
3036                 if ((sg->length + tmp) > offset) {
3037                         first_offset = rem_offset;
3038                         sg_srr_start = sg;
3039                         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe025,
3040                             "Found matching sg[%d], using %p as sg_srr_start, "
3041                             "and using first_offset: %zu\n", i, sg,
3042                             first_offset);
3043                         break;
3044                 }
3045                 tmp += sg->length;
3046                 rem_offset -= sg->length;
3047         }
3048
3049         if (!sg_srr_start) {
3050                 ql_dbg(ql_dbg_tgt, cmd->vha, 0xe056,
3051                     "Unable to locate sg_srr_start for offset: %u\n", offset);
3052                 return -EINVAL;
3053         }
3054         sg_srr_cnt = (cmd->sg_cnt - i);
3055
3056         sg_srr = kzalloc(sizeof(struct scatterlist) * sg_srr_cnt, GFP_KERNEL);
3057         if (!sg_srr) {
3058                 ql_dbg(ql_dbg_tgt, cmd->vha, 0xe057,
3059                     "Unable to allocate sgp\n");
3060                 return -ENOMEM;
3061         }
3062         sg_init_table(sg_srr, sg_srr_cnt);
3063         sgp = &sg_srr[0];
3064         /*
3065          * Walk the remaining list for sg_srr_start, mapping to the newly
3066          * allocated sg_srr taking first_offset into account.
3067          */
3068         for_each_sg(sg_srr_start, sg, sg_srr_cnt, i) {
3069                 if (first_offset) {
3070                         sg_set_page(sgp, sg_page(sg),
3071                             (sg->length - first_offset), first_offset);
3072                         first_offset = 0;
3073                 } else {
3074                         sg_set_page(sgp, sg_page(sg), sg->length, 0);
3075                 }
3076                 bufflen += sgp->length;
3077
3078                 sgp = sg_next(sgp);
3079                 if (!sgp)
3080                         break;
3081         }
3082
3083         cmd->sg = sg_srr;
3084         cmd->sg_cnt = sg_srr_cnt;
3085         cmd->bufflen = bufflen;
3086         cmd->offset += offset;
3087         cmd->free_sg = 1;
3088
3089         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe026, "New cmd->sg: %p\n", cmd->sg);
3090         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe027, "New cmd->sg_cnt: %u\n",
3091             cmd->sg_cnt);
3092         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe028, "New cmd->bufflen: %u\n",
3093             cmd->bufflen);
3094         ql_dbg(ql_dbg_tgt, cmd->vha, 0xe029, "New cmd->offset: %u\n",
3095             cmd->offset);
3096
3097         if (cmd->sg_cnt < 0)
3098                 BUG();
3099
3100         if (cmd->bufflen < 0)
3101                 BUG();
3102
3103         return 0;
3104 }
3105
3106 static inline int qlt_srr_adjust_data(struct qla_tgt_cmd *cmd,
3107         uint32_t srr_rel_offs, int *xmit_type)
3108 {
3109         int res = 0, rel_offs;
3110
3111         rel_offs = srr_rel_offs - cmd->offset;
3112         ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf027, "srr_rel_offs=%d, rel_offs=%d",
3113             srr_rel_offs, rel_offs);
3114
3115         *xmit_type = QLA_TGT_XMIT_ALL;
3116
3117         if (rel_offs < 0) {
3118                 ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf062,
3119                     "qla_target(%d): SRR rel_offs (%d) < 0",
3120                     cmd->vha->vp_idx, rel_offs);
3121                 res = -1;
3122         } else if (rel_offs == cmd->bufflen)
3123                 *xmit_type = QLA_TGT_XMIT_STATUS;
3124         else if (rel_offs > 0)
3125                 res = qlt_set_data_offset(cmd, rel_offs);
3126
3127         return res;
3128 }
3129
3130 /* No locks, thread context */
3131 static void qlt_handle_srr(struct scsi_qla_host *vha,
3132         struct qla_tgt_srr_ctio *sctio, struct qla_tgt_srr_imm *imm)
3133 {
3134         struct imm_ntfy_from_isp *ntfy =
3135             (struct imm_ntfy_from_isp *)&imm->imm_ntfy;
3136         struct qla_hw_data *ha = vha->hw;
3137         struct qla_tgt_cmd *cmd = sctio->cmd;
3138         struct se_cmd *se_cmd = &cmd->se_cmd;
3139         unsigned long flags;
3140         int xmit_type = 0, resp = 0;
3141         uint32_t offset;
3142         uint16_t srr_ui;
3143
3144         offset = le32_to_cpu(ntfy->u.isp24.srr_rel_offs);
3145         srr_ui = ntfy->u.isp24.srr_ui;
3146
3147         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf028, "SRR cmd %p, srr_ui %x\n",
3148             cmd, srr_ui);
3149
3150         switch (srr_ui) {
3151         case SRR_IU_STATUS:
3152                 spin_lock_irqsave(&ha->hardware_lock, flags);
3153                 qlt_send_notify_ack(vha, ntfy,
3154                     0, 0, 0, NOTIFY_ACK_SRR_FLAGS_ACCEPT, 0, 0);
3155                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
3156                 xmit_type = QLA_TGT_XMIT_STATUS;
3157                 resp = 1;
3158                 break;
3159         case SRR_IU_DATA_IN:
3160                 if (!cmd->sg || !cmd->sg_cnt) {
3161                         ql_dbg(ql_dbg_tgt_mgt, vha, 0xf063,