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48#include <linux/types.h>
49#include <linux/list.h>
50#include <linux/hardirq.h>
51#include <linux/kfifo.h>
52#include <linux/blkdev.h>
53#include <linux/init.h>
54#include <linux/ioctl.h>
55#include <linux/cdev.h>
56#include <linux/in.h>
57#include <linux/net.h>
58#include <linux/scatterlist.h>
59#include <linux/delay.h>
60#include <linux/slab.h>
61#include <linux/module.h>
62
63#include <net/sock.h>
64
65#include <linux/uaccess.h>
66
67#include <scsi/scsi_cmnd.h>
68#include <scsi/scsi_device.h>
69#include <scsi/scsi_eh.h>
70#include <scsi/scsi_tcq.h>
71#include <scsi/scsi_host.h>
72#include <scsi/scsi.h>
73#include <scsi/scsi_transport_iscsi.h>
74
75#include "iscsi_iser.h"
76
77MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
78MODULE_LICENSE("Dual BSD/GPL");
79MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
80
81static struct scsi_host_template iscsi_iser_sht;
82static struct iscsi_transport iscsi_iser_transport;
83static struct scsi_transport_template *iscsi_iser_scsi_transport;
84static struct workqueue_struct *release_wq;
85static DEFINE_MUTEX(unbind_iser_conn_mutex);
86struct iser_global ig;
87
88int iser_debug_level = 0;
89module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR);
90MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
91
92static int iscsi_iser_set(const char *val, const struct kernel_param *kp);
93static const struct kernel_param_ops iscsi_iser_size_ops = {
94 .set = iscsi_iser_set,
95 .get = param_get_uint,
96};
97
98static unsigned int iscsi_max_lun = 512;
99module_param_cb(max_lun, &iscsi_iser_size_ops, &iscsi_max_lun, S_IRUGO);
100MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session, should > 0 (default:512)");
101
102unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS;
103module_param_cb(max_sectors, &iscsi_iser_size_ops, &iser_max_sectors,
104 S_IRUGO | S_IWUSR);
105MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command, should > 0 (default:1024)");
106
107bool iser_always_reg = true;
108module_param_named(always_register, iser_always_reg, bool, S_IRUGO);
109MODULE_PARM_DESC(always_register,
110 "Always register memory, even for continuous memory regions (default:true)");
111
112bool iser_pi_enable = false;
113module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO);
114MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
115
116int iser_pi_guard;
117module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO);
118MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]");
119
120static int iscsi_iser_set(const char *val, const struct kernel_param *kp)
121{
122 int ret;
123 unsigned int n = 0;
124
125 ret = kstrtouint(val, 10, &n);
126 if (ret != 0 || n == 0)
127 return -EINVAL;
128
129 return param_set_uint(val, kp);
130}
131
132
133
134
135
136
137
138
139
140
141
142void
143iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
144 char *rx_data, int rx_data_len)
145{
146 int rc = 0;
147 int datalen;
148
149
150 datalen = ntoh24(hdr->dlength);
151 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
152 iser_err("wrong datalen %d (hdr), %d (IB)\n",
153 datalen, rx_data_len);
154 rc = ISCSI_ERR_DATALEN;
155 goto error;
156 }
157
158 if (datalen != rx_data_len)
159 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
160 datalen, rx_data_len);
161
162 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
163 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
164 goto error;
165
166 return;
167error:
168 iscsi_conn_failure(conn, rc);
169}
170
171
172
173
174
175
176
177
178
179static int
180iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
181{
182 struct iscsi_iser_task *iser_task = task->dd_data;
183
184 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
185 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
186
187 return 0;
188}
189
190
191
192
193
194
195
196
197
198
199
200
201int
202iser_initialize_task_headers(struct iscsi_task *task,
203 struct iser_tx_desc *tx_desc)
204{
205 struct iser_conn *iser_conn = task->conn->dd_data;
206 struct iser_device *device = iser_conn->ib_conn.device;
207 struct iscsi_iser_task *iser_task = task->dd_data;
208 u64 dma_addr;
209
210 if (unlikely(iser_conn->state != ISER_CONN_UP))
211 return -ENODEV;
212
213 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
214 ISER_HEADERS_LEN, DMA_TO_DEVICE);
215 if (ib_dma_mapping_error(device->ib_device, dma_addr))
216 return -ENOMEM;
217
218 tx_desc->inv_wr.next = NULL;
219 tx_desc->reg_wr.wr.next = NULL;
220 tx_desc->mapped = true;
221 tx_desc->dma_addr = dma_addr;
222 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
223 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
224 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
225
226 iser_task->iser_conn = iser_conn;
227
228 return 0;
229}
230
231
232
233
234
235
236
237
238
239
240static int
241iscsi_iser_task_init(struct iscsi_task *task)
242{
243 struct iscsi_iser_task *iser_task = task->dd_data;
244 int ret;
245
246 ret = iser_initialize_task_headers(task, &iser_task->desc);
247 if (ret) {
248 iser_err("Failed to init task %p, err = %d\n",
249 iser_task, ret);
250 return ret;
251 }
252
253
254 if (!task->sc)
255 return 0;
256
257 iser_task->command_sent = 0;
258 iser_task_rdma_init(iser_task);
259 iser_task->sc = task->sc;
260
261 return 0;
262}
263
264
265
266
267
268
269
270
271
272
273
274
275static int
276iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
277{
278 int error = 0;
279
280 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
281
282 error = iser_send_control(conn, task);
283
284
285
286
287
288
289
290 return error;
291}
292
293static int
294iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
295 struct iscsi_task *task)
296{
297 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
298 struct iscsi_data hdr;
299 int error = 0;
300
301
302 while (iscsi_task_has_unsol_data(task)) {
303 iscsi_prep_data_out_pdu(task, r2t, &hdr);
304 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
305 hdr.itt, r2t->data_count);
306
307
308
309 error = iser_send_data_out(conn, task, &hdr);
310 if (error) {
311 r2t->datasn--;
312 goto iscsi_iser_task_xmit_unsol_data_exit;
313 }
314 r2t->sent += r2t->data_count;
315 iser_dbg("Need to send %d more as data-out PDUs\n",
316 r2t->data_length - r2t->sent);
317 }
318
319iscsi_iser_task_xmit_unsol_data_exit:
320 return error;
321}
322
323
324
325
326
327
328
329static int
330iscsi_iser_task_xmit(struct iscsi_task *task)
331{
332 struct iscsi_conn *conn = task->conn;
333 struct iscsi_iser_task *iser_task = task->dd_data;
334 int error = 0;
335
336 if (!task->sc)
337 return iscsi_iser_mtask_xmit(conn, task);
338
339 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
340 BUG_ON(scsi_bufflen(task->sc) == 0);
341
342 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
343 task->itt, scsi_bufflen(task->sc),
344 task->imm_count, task->unsol_r2t.data_length);
345 }
346
347 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
348 conn->id, task->itt);
349
350
351 if (!iser_task->command_sent) {
352 error = iser_send_command(conn, task);
353 if (error)
354 goto iscsi_iser_task_xmit_exit;
355 iser_task->command_sent = 1;
356 }
357
358
359 if (iscsi_task_has_unsol_data(task))
360 error = iscsi_iser_task_xmit_unsol_data(conn, task);
361
362 iscsi_iser_task_xmit_exit:
363 return error;
364}
365
366
367
368
369
370
371
372
373
374static void iscsi_iser_cleanup_task(struct iscsi_task *task)
375{
376 struct iscsi_iser_task *iser_task = task->dd_data;
377 struct iser_tx_desc *tx_desc = &iser_task->desc;
378 struct iser_conn *iser_conn = task->conn->dd_data;
379 struct iser_device *device = iser_conn->ib_conn.device;
380
381
382 if (!device)
383 return;
384
385 if (likely(tx_desc->mapped)) {
386 ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr,
387 ISER_HEADERS_LEN, DMA_TO_DEVICE);
388 tx_desc->mapped = false;
389 }
390
391
392 if (!task->sc)
393 return;
394
395 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
396 iser_task->status = ISER_TASK_STATUS_COMPLETED;
397 iser_task_rdma_finalize(iser_task);
398 }
399}
400
401
402
403
404
405
406
407
408
409
410
411
412
413static u8
414iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
415{
416 struct iscsi_iser_task *iser_task = task->dd_data;
417 enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ?
418 ISER_DIR_IN : ISER_DIR_OUT;
419
420 return iser_check_task_pi_status(iser_task, dir, sector);
421}
422
423
424
425
426
427
428
429
430
431static struct iscsi_cls_conn *
432iscsi_iser_conn_create(struct iscsi_cls_session *cls_session,
433 uint32_t conn_idx)
434{
435 struct iscsi_conn *conn;
436 struct iscsi_cls_conn *cls_conn;
437
438 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
439 if (!cls_conn)
440 return NULL;
441 conn = cls_conn->dd_data;
442
443
444
445
446
447 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
448
449 return cls_conn;
450}
451
452
453
454
455
456
457
458
459
460
461
462
463static int
464iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
465 struct iscsi_cls_conn *cls_conn,
466 uint64_t transport_eph,
467 int is_leading)
468{
469 struct iscsi_conn *conn = cls_conn->dd_data;
470 struct iser_conn *iser_conn;
471 struct iscsi_endpoint *ep;
472 int error;
473
474 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
475 if (error)
476 return error;
477
478
479
480 ep = iscsi_lookup_endpoint(transport_eph);
481 if (!ep) {
482 iser_err("can't bind eph %llx\n",
483 (unsigned long long)transport_eph);
484 return -EINVAL;
485 }
486 iser_conn = ep->dd_data;
487
488 mutex_lock(&iser_conn->state_mutex);
489 if (iser_conn->state != ISER_CONN_UP) {
490 error = -EINVAL;
491 iser_err("iser_conn %p state is %d, teardown started\n",
492 iser_conn, iser_conn->state);
493 goto out;
494 }
495
496 error = iser_alloc_rx_descriptors(iser_conn, conn->session);
497 if (error)
498 goto out;
499
500
501
502
503 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);
504
505 conn->dd_data = iser_conn;
506 iser_conn->iscsi_conn = conn;
507
508out:
509 iscsi_put_endpoint(ep);
510 mutex_unlock(&iser_conn->state_mutex);
511 return error;
512}
513
514
515
516
517
518
519
520
521
522static int
523iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
524{
525 struct iscsi_conn *iscsi_conn;
526 struct iser_conn *iser_conn;
527
528 iscsi_conn = cls_conn->dd_data;
529 iser_conn = iscsi_conn->dd_data;
530 reinit_completion(&iser_conn->stop_completion);
531
532 return iscsi_conn_start(cls_conn);
533}
534
535
536
537
538
539
540
541
542
543
544
545static void
546iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
547{
548 struct iscsi_conn *conn = cls_conn->dd_data;
549 struct iser_conn *iser_conn = conn->dd_data;
550
551 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
552
553
554
555
556
557 if (iser_conn) {
558 mutex_lock(&iser_conn->state_mutex);
559 mutex_lock(&unbind_iser_conn_mutex);
560 iser_conn_terminate(iser_conn);
561 iscsi_conn_stop(cls_conn, flag);
562
563
564 iser_conn->iscsi_conn = NULL;
565 conn->dd_data = NULL;
566 mutex_unlock(&unbind_iser_conn_mutex);
567
568 complete(&iser_conn->stop_completion);
569 mutex_unlock(&iser_conn->state_mutex);
570 } else {
571 iscsi_conn_stop(cls_conn, flag);
572 }
573}
574
575
576
577
578
579
580
581static void
582iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
583{
584 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
585
586 iscsi_session_teardown(cls_session);
587 iscsi_host_remove(shost);
588 iscsi_host_free(shost);
589}
590
591static inline unsigned int
592iser_dif_prot_caps(int prot_caps)
593{
594 int ret = 0;
595
596 if (prot_caps & IB_PROT_T10DIF_TYPE_1)
597 ret |= SHOST_DIF_TYPE1_PROTECTION |
598 SHOST_DIX_TYPE0_PROTECTION |
599 SHOST_DIX_TYPE1_PROTECTION;
600 if (prot_caps & IB_PROT_T10DIF_TYPE_2)
601 ret |= SHOST_DIF_TYPE2_PROTECTION |
602 SHOST_DIX_TYPE2_PROTECTION;
603 if (prot_caps & IB_PROT_T10DIF_TYPE_3)
604 ret |= SHOST_DIF_TYPE3_PROTECTION |
605 SHOST_DIX_TYPE3_PROTECTION;
606
607 return ret;
608}
609
610
611
612
613
614
615
616
617
618
619
620static struct iscsi_cls_session *
621iscsi_iser_session_create(struct iscsi_endpoint *ep,
622 uint16_t cmds_max, uint16_t qdepth,
623 uint32_t initial_cmdsn)
624{
625 struct iscsi_cls_session *cls_session;
626 struct Scsi_Host *shost;
627 struct iser_conn *iser_conn = NULL;
628 struct ib_conn *ib_conn;
629 struct ib_device *ib_dev;
630 u32 max_fr_sectors;
631
632 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
633 if (!shost)
634 return NULL;
635 shost->transportt = iscsi_iser_scsi_transport;
636 shost->cmd_per_lun = qdepth;
637 shost->max_lun = iscsi_max_lun;
638 shost->max_id = 0;
639 shost->max_channel = 0;
640 shost->max_cmd_len = 16;
641
642
643
644
645
646 if (ep) {
647 iser_conn = ep->dd_data;
648 shost->sg_tablesize = iser_conn->scsi_sg_tablesize;
649 shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds);
650
651 mutex_lock(&iser_conn->state_mutex);
652 if (iser_conn->state != ISER_CONN_UP) {
653 iser_err("iser conn %p already started teardown\n",
654 iser_conn);
655 mutex_unlock(&iser_conn->state_mutex);
656 goto free_host;
657 }
658
659 ib_conn = &iser_conn->ib_conn;
660 ib_dev = ib_conn->device->ib_device;
661 if (ib_conn->pi_support) {
662 u32 sig_caps = ib_dev->attrs.sig_prot_cap;
663
664 shost->sg_prot_tablesize = shost->sg_tablesize;
665 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
666 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
667 SHOST_DIX_GUARD_CRC);
668 }
669
670 if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG))
671 shost->virt_boundary_mask = SZ_4K - 1;
672
673 if (iscsi_host_add(shost, ib_dev->dev.parent)) {
674 mutex_unlock(&iser_conn->state_mutex);
675 goto free_host;
676 }
677 mutex_unlock(&iser_conn->state_mutex);
678 } else {
679 shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX);
680 if (iscsi_host_add(shost, NULL))
681 goto free_host;
682 }
683
684 max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9;
685 shost->max_sectors = min(iser_max_sectors, max_fr_sectors);
686
687 iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n",
688 iser_conn, shost->sg_tablesize,
689 shost->max_sectors);
690
691 if (shost->max_sectors < iser_max_sectors)
692 iser_warn("max_sectors was reduced from %u to %u\n",
693 iser_max_sectors, shost->max_sectors);
694
695 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
696 shost->can_queue, 0,
697 sizeof(struct iscsi_iser_task),
698 initial_cmdsn, 0);
699 if (!cls_session)
700 goto remove_host;
701
702 return cls_session;
703
704remove_host:
705 iscsi_host_remove(shost);
706free_host:
707 iscsi_host_free(shost);
708 return NULL;
709}
710
711static int
712iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
713 enum iscsi_param param, char *buf, int buflen)
714{
715 int value;
716
717 switch (param) {
718 case ISCSI_PARAM_MAX_RECV_DLENGTH:
719
720 break;
721 case ISCSI_PARAM_HDRDGST_EN:
722 sscanf(buf, "%d", &value);
723 if (value) {
724 iser_err("DataDigest wasn't negotiated to None\n");
725 return -EPROTO;
726 }
727 break;
728 case ISCSI_PARAM_DATADGST_EN:
729 sscanf(buf, "%d", &value);
730 if (value) {
731 iser_err("DataDigest wasn't negotiated to None\n");
732 return -EPROTO;
733 }
734 break;
735 case ISCSI_PARAM_IFMARKER_EN:
736 sscanf(buf, "%d", &value);
737 if (value) {
738 iser_err("IFMarker wasn't negotiated to No\n");
739 return -EPROTO;
740 }
741 break;
742 case ISCSI_PARAM_OFMARKER_EN:
743 sscanf(buf, "%d", &value);
744 if (value) {
745 iser_err("OFMarker wasn't negotiated to No\n");
746 return -EPROTO;
747 }
748 break;
749 default:
750 return iscsi_set_param(cls_conn, param, buf, buflen);
751 }
752
753 return 0;
754}
755
756
757
758
759
760
761
762
763static void
764iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
765{
766 struct iscsi_conn *conn = cls_conn->dd_data;
767
768 stats->txdata_octets = conn->txdata_octets;
769 stats->rxdata_octets = conn->rxdata_octets;
770 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
771 stats->dataout_pdus = conn->dataout_pdus_cnt;
772 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
773 stats->datain_pdus = conn->datain_pdus_cnt;
774 stats->r2t_pdus = conn->r2t_pdus_cnt;
775 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
776 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
777 stats->custom_length = 0;
778}
779
780static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
781 enum iscsi_param param, char *buf)
782{
783 struct iser_conn *iser_conn = ep->dd_data;
784
785 switch (param) {
786 case ISCSI_PARAM_CONN_PORT:
787 case ISCSI_PARAM_CONN_ADDRESS:
788 if (!iser_conn || !iser_conn->ib_conn.cma_id)
789 return -ENOTCONN;
790
791 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
792 &iser_conn->ib_conn.cma_id->route.addr.dst_addr,
793 param, buf);
794 default:
795 break;
796 }
797 return -ENOSYS;
798}
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815static struct iscsi_endpoint *
816iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
817 int non_blocking)
818{
819 int err;
820 struct iser_conn *iser_conn;
821 struct iscsi_endpoint *ep;
822
823 ep = iscsi_create_endpoint(0);
824 if (!ep)
825 return ERR_PTR(-ENOMEM);
826
827 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
828 if (!iser_conn) {
829 err = -ENOMEM;
830 goto failure;
831 }
832
833 ep->dd_data = iser_conn;
834 iser_conn->ep = ep;
835 iser_conn_init(iser_conn);
836
837 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);
838 if (err)
839 goto failure;
840
841 return ep;
842failure:
843 iscsi_destroy_endpoint(ep);
844 return ERR_PTR(err);
845}
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860static int
861iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
862{
863 struct iser_conn *iser_conn = ep->dd_data;
864 int rc;
865
866 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,
867 msecs_to_jiffies(timeout_ms));
868
869 if (rc == 0) {
870 mutex_lock(&iser_conn->state_mutex);
871 if (iser_conn->state == ISER_CONN_TERMINATING ||
872 iser_conn->state == ISER_CONN_DOWN)
873 rc = -1;
874 mutex_unlock(&iser_conn->state_mutex);
875 }
876
877 iser_info("iser conn %p rc = %d\n", iser_conn, rc);
878
879 if (rc > 0)
880 return 1;
881 else if (!rc)
882 return 0;
883 else
884 return rc;
885}
886
887
888
889
890
891
892
893
894
895
896static void
897iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
898{
899 struct iser_conn *iser_conn = ep->dd_data;
900
901 iser_info("ep %p iser conn %p\n", ep, iser_conn);
902
903 mutex_lock(&iser_conn->state_mutex);
904 iser_conn_terminate(iser_conn);
905
906
907
908
909
910
911
912 if (iser_conn->iscsi_conn) {
913 INIT_WORK(&iser_conn->release_work, iser_release_work);
914 queue_work(release_wq, &iser_conn->release_work);
915 mutex_unlock(&iser_conn->state_mutex);
916 } else {
917 iser_conn->state = ISER_CONN_DOWN;
918 mutex_unlock(&iser_conn->state_mutex);
919 iser_conn_release(iser_conn);
920 }
921
922 iscsi_destroy_endpoint(ep);
923}
924
925static umode_t iser_attr_is_visible(int param_type, int param)
926{
927 switch (param_type) {
928 case ISCSI_HOST_PARAM:
929 switch (param) {
930 case ISCSI_HOST_PARAM_NETDEV_NAME:
931 case ISCSI_HOST_PARAM_HWADDRESS:
932 case ISCSI_HOST_PARAM_INITIATOR_NAME:
933 return S_IRUGO;
934 default:
935 return 0;
936 }
937 case ISCSI_PARAM:
938 switch (param) {
939 case ISCSI_PARAM_MAX_RECV_DLENGTH:
940 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
941 case ISCSI_PARAM_HDRDGST_EN:
942 case ISCSI_PARAM_DATADGST_EN:
943 case ISCSI_PARAM_CONN_ADDRESS:
944 case ISCSI_PARAM_CONN_PORT:
945 case ISCSI_PARAM_EXP_STATSN:
946 case ISCSI_PARAM_PERSISTENT_ADDRESS:
947 case ISCSI_PARAM_PERSISTENT_PORT:
948 case ISCSI_PARAM_PING_TMO:
949 case ISCSI_PARAM_RECV_TMO:
950 case ISCSI_PARAM_INITIAL_R2T_EN:
951 case ISCSI_PARAM_MAX_R2T:
952 case ISCSI_PARAM_IMM_DATA_EN:
953 case ISCSI_PARAM_FIRST_BURST:
954 case ISCSI_PARAM_MAX_BURST:
955 case ISCSI_PARAM_PDU_INORDER_EN:
956 case ISCSI_PARAM_DATASEQ_INORDER_EN:
957 case ISCSI_PARAM_TARGET_NAME:
958 case ISCSI_PARAM_TPGT:
959 case ISCSI_PARAM_USERNAME:
960 case ISCSI_PARAM_PASSWORD:
961 case ISCSI_PARAM_USERNAME_IN:
962 case ISCSI_PARAM_PASSWORD_IN:
963 case ISCSI_PARAM_FAST_ABORT:
964 case ISCSI_PARAM_ABORT_TMO:
965 case ISCSI_PARAM_LU_RESET_TMO:
966 case ISCSI_PARAM_TGT_RESET_TMO:
967 case ISCSI_PARAM_IFACE_NAME:
968 case ISCSI_PARAM_INITIATOR_NAME:
969 case ISCSI_PARAM_DISCOVERY_SESS:
970 return S_IRUGO;
971 default:
972 return 0;
973 }
974 }
975
976 return 0;
977}
978
979static struct scsi_host_template iscsi_iser_sht = {
980 .module = THIS_MODULE,
981 .name = "iSCSI Initiator over iSER",
982 .queuecommand = iscsi_queuecommand,
983 .change_queue_depth = scsi_change_queue_depth,
984 .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE,
985 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
986 .eh_timed_out = iscsi_eh_cmd_timed_out,
987 .eh_abort_handler = iscsi_eh_abort,
988 .eh_device_reset_handler= iscsi_eh_device_reset,
989 .eh_target_reset_handler = iscsi_eh_recover_target,
990 .target_alloc = iscsi_target_alloc,
991 .proc_name = "iscsi_iser",
992 .this_id = -1,
993 .track_queue_depth = 1,
994};
995
996static struct iscsi_transport iscsi_iser_transport = {
997 .owner = THIS_MODULE,
998 .name = "iser",
999 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
1000
1001 .create_session = iscsi_iser_session_create,
1002 .destroy_session = iscsi_iser_session_destroy,
1003
1004 .create_conn = iscsi_iser_conn_create,
1005 .bind_conn = iscsi_iser_conn_bind,
1006 .unbind_conn = iscsi_conn_unbind,
1007 .destroy_conn = iscsi_conn_teardown,
1008 .attr_is_visible = iser_attr_is_visible,
1009 .set_param = iscsi_iser_set_param,
1010 .get_conn_param = iscsi_conn_get_param,
1011 .get_ep_param = iscsi_iser_get_ep_param,
1012 .get_session_param = iscsi_session_get_param,
1013 .start_conn = iscsi_iser_conn_start,
1014 .stop_conn = iscsi_iser_conn_stop,
1015
1016 .get_host_param = iscsi_host_get_param,
1017 .set_host_param = iscsi_host_set_param,
1018
1019 .send_pdu = iscsi_conn_send_pdu,
1020 .get_stats = iscsi_iser_conn_get_stats,
1021 .init_task = iscsi_iser_task_init,
1022 .xmit_task = iscsi_iser_task_xmit,
1023 .cleanup_task = iscsi_iser_cleanup_task,
1024 .alloc_pdu = iscsi_iser_pdu_alloc,
1025 .check_protection = iscsi_iser_check_protection,
1026
1027 .session_recovery_timedout = iscsi_session_recovery_timedout,
1028
1029 .ep_connect = iscsi_iser_ep_connect,
1030 .ep_poll = iscsi_iser_ep_poll,
1031 .ep_disconnect = iscsi_iser_ep_disconnect
1032};
1033
1034static int __init iser_init(void)
1035{
1036 int err;
1037
1038 iser_dbg("Starting iSER datamover...\n");
1039
1040 memset(&ig, 0, sizeof(struct iser_global));
1041
1042 ig.desc_cache = kmem_cache_create("iser_descriptors",
1043 sizeof(struct iser_tx_desc),
1044 0, SLAB_HWCACHE_ALIGN,
1045 NULL);
1046 if (ig.desc_cache == NULL)
1047 return -ENOMEM;
1048
1049
1050 mutex_init(&ig.device_list_mutex);
1051 INIT_LIST_HEAD(&ig.device_list);
1052 mutex_init(&ig.connlist_mutex);
1053 INIT_LIST_HEAD(&ig.connlist);
1054
1055 release_wq = alloc_workqueue("release workqueue", 0, 0);
1056 if (!release_wq) {
1057 iser_err("failed to allocate release workqueue\n");
1058 err = -ENOMEM;
1059 goto err_alloc_wq;
1060 }
1061
1062 iscsi_iser_scsi_transport = iscsi_register_transport(
1063 &iscsi_iser_transport);
1064 if (!iscsi_iser_scsi_transport) {
1065 iser_err("iscsi_register_transport failed\n");
1066 err = -EINVAL;
1067 goto err_reg;
1068 }
1069
1070 return 0;
1071
1072err_reg:
1073 destroy_workqueue(release_wq);
1074err_alloc_wq:
1075 kmem_cache_destroy(ig.desc_cache);
1076
1077 return err;
1078}
1079
1080static void __exit iser_exit(void)
1081{
1082 struct iser_conn *iser_conn, *n;
1083 int connlist_empty;
1084
1085 iser_dbg("Removing iSER datamover...\n");
1086 destroy_workqueue(release_wq);
1087
1088 mutex_lock(&ig.connlist_mutex);
1089 connlist_empty = list_empty(&ig.connlist);
1090 mutex_unlock(&ig.connlist_mutex);
1091
1092 if (!connlist_empty) {
1093 iser_err("Error cleanup stage completed but we still have iser "
1094 "connections, destroying them anyway\n");
1095 list_for_each_entry_safe(iser_conn, n, &ig.connlist,
1096 conn_list) {
1097 iser_conn_release(iser_conn);
1098 }
1099 }
1100
1101 iscsi_unregister_transport(&iscsi_iser_transport);
1102 kmem_cache_destroy(ig.desc_cache);
1103}
1104
1105module_init(iser_init);
1106module_exit(iser_exit);
1107