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47#include <linux/types.h>
48#include <linux/list.h>
49#include <linux/hardirq.h>
50#include <linux/kfifo.h>
51#include <linux/blkdev.h>
52#include <linux/init.h>
53#include <linux/ioctl.h>
54#include <linux/cdev.h>
55#include <linux/in.h>
56#include <linux/net.h>
57#include <linux/scatterlist.h>
58#include <linux/delay.h>
59
60#include <net/sock.h>
61
62#include <asm/uaccess.h>
63
64#include <scsi/scsi_cmnd.h>
65#include <scsi/scsi_device.h>
66#include <scsi/scsi_eh.h>
67#include <scsi/scsi_tcq.h>
68#include <scsi/scsi_host.h>
69#include <scsi/scsi.h>
70#include <scsi/scsi_transport_iscsi.h>
71
72#include "iscsi_iser.h"
73
74static struct scsi_host_template iscsi_iser_sht;
75static struct iscsi_transport iscsi_iser_transport;
76static struct scsi_transport_template *iscsi_iser_scsi_transport;
77
78static unsigned int iscsi_max_lun = 512;
79module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
80
81int iser_debug_level = 0;
82
83MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
84 "v" DRV_VER " (" DRV_DATE ")");
85MODULE_LICENSE("Dual BSD/GPL");
86MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
87
88module_param_named(debug_level, iser_debug_level, int, 0644);
89MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
90
91struct iser_global ig;
92
93void
94iscsi_iser_recv(struct iscsi_conn *conn,
95 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
96{
97 int rc = 0;
98 int datalen;
99 int ahslen;
100
101
102 datalen = ntoh24(hdr->dlength);
103 if (datalen != rx_data_len) {
104 printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
105 datalen, rx_data_len);
106 rc = ISCSI_ERR_DATALEN;
107 goto error;
108 }
109
110
111 ahslen = hdr->hlength * 4;
112
113 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
114 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
115 goto error;
116
117 return;
118error:
119 iscsi_conn_failure(conn, rc);
120}
121
122static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
123{
124 struct iscsi_iser_task *iser_task = task->dd_data;
125
126 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
127 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
128 return 0;
129}
130
131
132
133
134
135
136
137static int
138iscsi_iser_task_init(struct iscsi_task *task)
139{
140 struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
141 struct iscsi_iser_task *iser_task = task->dd_data;
142
143
144 if (!task->sc) {
145 iser_task->desc.data = task->data;
146 return 0;
147 }
148
149 iser_task->command_sent = 0;
150 iser_task->iser_conn = iser_conn;
151 iser_task_rdma_init(iser_task);
152 return 0;
153}
154
155
156
157
158
159
160
161
162
163
164
165
166static int
167iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
168{
169 int error = 0;
170
171 iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt);
172
173 error = iser_send_control(conn, task);
174
175
176
177
178
179
180
181 if (error && error != -ENOBUFS)
182 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
183
184 return error;
185}
186
187static int
188iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
189 struct iscsi_task *task)
190{
191 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
192 struct iscsi_data hdr;
193 int error = 0;
194
195
196 while (iscsi_task_has_unsol_data(task)) {
197 iscsi_prep_data_out_pdu(task, r2t, &hdr);
198 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
199 hdr.itt, r2t->data_count);
200
201
202
203 error = iser_send_data_out(conn, task, &hdr);
204 if (error) {
205 r2t->datasn--;
206 goto iscsi_iser_task_xmit_unsol_data_exit;
207 }
208 r2t->sent += r2t->data_count;
209 iser_dbg("Need to send %d more as data-out PDUs\n",
210 r2t->data_length - r2t->sent);
211 }
212
213iscsi_iser_task_xmit_unsol_data_exit:
214 return error;
215}
216
217static int
218iscsi_iser_task_xmit(struct iscsi_task *task)
219{
220 struct iscsi_conn *conn = task->conn;
221 struct iscsi_iser_task *iser_task = task->dd_data;
222 int error = 0;
223
224 if (!task->sc)
225 return iscsi_iser_mtask_xmit(conn, task);
226
227 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
228 BUG_ON(scsi_bufflen(task->sc) == 0);
229
230 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
231 task->itt, scsi_bufflen(task->sc),
232 task->imm_count, task->unsol_r2t.data_length);
233 }
234
235 iser_dbg("task deq [cid %d itt 0x%x]\n",
236 conn->id, task->itt);
237
238
239 if (!iser_task->command_sent) {
240 error = iser_send_command(conn, task);
241 if (error)
242 goto iscsi_iser_task_xmit_exit;
243 iser_task->command_sent = 1;
244 }
245
246
247 if (iscsi_task_has_unsol_data(task))
248 error = iscsi_iser_task_xmit_unsol_data(conn, task);
249
250 iscsi_iser_task_xmit_exit:
251 if (error && error != -ENOBUFS)
252 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
253 return error;
254}
255
256static void iscsi_iser_cleanup_task(struct iscsi_task *task)
257{
258 struct iscsi_iser_task *iser_task = task->dd_data;
259
260
261 if (!task->sc)
262 return;
263
264 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
265 iser_task->status = ISER_TASK_STATUS_COMPLETED;
266 iser_task_rdma_finalize(iser_task);
267 }
268}
269
270static struct iscsi_cls_conn *
271iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
272{
273 struct iscsi_conn *conn;
274 struct iscsi_cls_conn *cls_conn;
275 struct iscsi_iser_conn *iser_conn;
276
277 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
278 if (!cls_conn)
279 return NULL;
280 conn = cls_conn->dd_data;
281
282
283
284
285
286 conn->max_recv_dlength = 128;
287
288 iser_conn = conn->dd_data;
289 conn->dd_data = iser_conn;
290 iser_conn->iscsi_conn = conn;
291
292 return cls_conn;
293}
294
295static void
296iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
297{
298 struct iscsi_conn *conn = cls_conn->dd_data;
299 struct iscsi_iser_conn *iser_conn = conn->dd_data;
300 struct iser_conn *ib_conn = iser_conn->ib_conn;
301
302 iscsi_conn_teardown(cls_conn);
303
304
305
306
307
308 if (ib_conn) {
309 ib_conn->iser_conn = NULL;
310 iser_conn_put(ib_conn);
311 }
312}
313
314static int
315iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
316 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
317 int is_leading)
318{
319 struct iscsi_conn *conn = cls_conn->dd_data;
320 struct iscsi_iser_conn *iser_conn;
321 struct iser_conn *ib_conn;
322 struct iscsi_endpoint *ep;
323 int error;
324
325 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
326 if (error)
327 return error;
328
329
330
331 ep = iscsi_lookup_endpoint(transport_eph);
332 if (!ep) {
333 iser_err("can't bind eph %llx\n",
334 (unsigned long long)transport_eph);
335 return -EINVAL;
336 }
337 ib_conn = ep->dd_data;
338
339
340
341
342 iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
343 iser_conn = conn->dd_data;
344 ib_conn->iser_conn = iser_conn;
345 iser_conn->ib_conn = ib_conn;
346 iser_conn_get(ib_conn);
347 return 0;
348}
349
350static void
351iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
352{
353 struct iscsi_conn *conn = cls_conn->dd_data;
354 struct iscsi_iser_conn *iser_conn = conn->dd_data;
355 struct iser_conn *ib_conn = iser_conn->ib_conn;
356
357
358
359
360
361 if (ib_conn) {
362 iscsi_conn_stop(cls_conn, flag);
363
364
365
366
367 iser_conn_put(ib_conn);
368 }
369 iser_conn->ib_conn = NULL;
370}
371
372static int
373iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
374{
375 struct iscsi_conn *conn = cls_conn->dd_data;
376 int err;
377
378 err = iser_conn_set_full_featured_mode(conn);
379 if (err)
380 return err;
381
382 return iscsi_conn_start(cls_conn);
383}
384
385static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
386{
387 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
388
389 iscsi_session_teardown(cls_session);
390 iscsi_host_remove(shost);
391 iscsi_host_free(shost);
392}
393
394static struct iscsi_cls_session *
395iscsi_iser_session_create(struct iscsi_endpoint *ep,
396 uint16_t cmds_max, uint16_t qdepth,
397 uint32_t initial_cmdsn)
398{
399 struct iscsi_cls_session *cls_session;
400 struct iscsi_session *session;
401 struct Scsi_Host *shost;
402 struct iser_conn *ib_conn;
403
404 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1);
405 if (!shost)
406 return NULL;
407 shost->transportt = iscsi_iser_scsi_transport;
408 shost->max_lun = iscsi_max_lun;
409 shost->max_id = 0;
410 shost->max_channel = 0;
411 shost->max_cmd_len = 16;
412
413
414
415
416
417 if (ep)
418 ib_conn = ep->dd_data;
419
420 if (iscsi_host_add(shost,
421 ep ? ib_conn->device->ib_device->dma_device : NULL))
422 goto free_host;
423
424
425
426
427
428 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
429 ISCSI_DEF_XMIT_CMDS_MAX, 0,
430 sizeof(struct iscsi_iser_task),
431 initial_cmdsn, 0);
432 if (!cls_session)
433 goto remove_host;
434 session = cls_session->dd_data;
435
436 shost->can_queue = session->scsi_cmds_max;
437 return cls_session;
438
439remove_host:
440 iscsi_host_remove(shost);
441free_host:
442 iscsi_host_free(shost);
443 return NULL;
444}
445
446static int
447iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
448 enum iscsi_param param, char *buf, int buflen)
449{
450 int value;
451
452 switch (param) {
453 case ISCSI_PARAM_MAX_RECV_DLENGTH:
454
455 break;
456 case ISCSI_PARAM_HDRDGST_EN:
457 sscanf(buf, "%d", &value);
458 if (value) {
459 printk(KERN_ERR "DataDigest wasn't negotiated to None");
460 return -EPROTO;
461 }
462 break;
463 case ISCSI_PARAM_DATADGST_EN:
464 sscanf(buf, "%d", &value);
465 if (value) {
466 printk(KERN_ERR "DataDigest wasn't negotiated to None");
467 return -EPROTO;
468 }
469 break;
470 case ISCSI_PARAM_IFMARKER_EN:
471 sscanf(buf, "%d", &value);
472 if (value) {
473 printk(KERN_ERR "IFMarker wasn't negotiated to No");
474 return -EPROTO;
475 }
476 break;
477 case ISCSI_PARAM_OFMARKER_EN:
478 sscanf(buf, "%d", &value);
479 if (value) {
480 printk(KERN_ERR "OFMarker wasn't negotiated to No");
481 return -EPROTO;
482 }
483 break;
484 default:
485 return iscsi_set_param(cls_conn, param, buf, buflen);
486 }
487
488 return 0;
489}
490
491static void
492iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
493{
494 struct iscsi_conn *conn = cls_conn->dd_data;
495
496 stats->txdata_octets = conn->txdata_octets;
497 stats->rxdata_octets = conn->rxdata_octets;
498 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
499 stats->dataout_pdus = conn->dataout_pdus_cnt;
500 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
501 stats->datain_pdus = conn->datain_pdus_cnt;
502 stats->r2t_pdus = conn->r2t_pdus_cnt;
503 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
504 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
505 stats->custom_length = 4;
506 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
507 stats->custom[0].value = 0;
508 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
509 stats->custom[1].value = 0; ;
510 strcpy(stats->custom[2].desc, "eh_abort_cnt");
511 stats->custom[2].value = conn->eh_abort_cnt;
512 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
513 stats->custom[3].value = conn->fmr_unalign_cnt;
514}
515
516static struct iscsi_endpoint *
517iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
518 int non_blocking)
519{
520 int err;
521 struct iser_conn *ib_conn;
522 struct iscsi_endpoint *ep;
523
524 ep = iscsi_create_endpoint(sizeof(*ib_conn));
525 if (!ep)
526 return ERR_PTR(-ENOMEM);
527
528 ib_conn = ep->dd_data;
529 ib_conn->ep = ep;
530 iser_conn_init(ib_conn);
531
532 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
533 non_blocking);
534 if (err) {
535 iscsi_destroy_endpoint(ep);
536 return ERR_PTR(err);
537 }
538 return ep;
539}
540
541static int
542iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
543{
544 struct iser_conn *ib_conn;
545 int rc;
546
547 ib_conn = ep->dd_data;
548 rc = wait_event_interruptible_timeout(ib_conn->wait,
549 ib_conn->state == ISER_CONN_UP,
550 msecs_to_jiffies(timeout_ms));
551
552
553 if (!rc &&
554 (ib_conn->state == ISER_CONN_TERMINATING ||
555 ib_conn->state == ISER_CONN_DOWN))
556 rc = -1;
557
558 iser_err("ib conn %p rc = %d\n", ib_conn, rc);
559
560 if (rc > 0)
561 return 1;
562 else if (!rc)
563 return 0;
564 else
565 return rc;
566}
567
568static void
569iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
570{
571 struct iser_conn *ib_conn;
572
573 ib_conn = ep->dd_data;
574 if (ib_conn->iser_conn)
575
576
577
578
579
580
581
582 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
583
584
585 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
586 iser_conn_terminate(ib_conn);
587}
588
589static struct scsi_host_template iscsi_iser_sht = {
590 .module = THIS_MODULE,
591 .name = "iSCSI Initiator over iSER, v." DRV_VER,
592 .queuecommand = iscsi_queuecommand,
593 .change_queue_depth = iscsi_change_queue_depth,
594 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
595 .max_sectors = 1024,
596 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
597 .eh_abort_handler = iscsi_eh_abort,
598 .eh_device_reset_handler= iscsi_eh_device_reset,
599 .eh_target_reset_handler= iscsi_eh_target_reset,
600 .target_alloc = iscsi_target_alloc,
601 .use_clustering = DISABLE_CLUSTERING,
602 .proc_name = "iscsi_iser",
603 .this_id = -1,
604};
605
606static struct iscsi_transport iscsi_iser_transport = {
607 .owner = THIS_MODULE,
608 .name = "iser",
609 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
610 .param_mask = ISCSI_MAX_RECV_DLENGTH |
611 ISCSI_MAX_XMIT_DLENGTH |
612 ISCSI_HDRDGST_EN |
613 ISCSI_DATADGST_EN |
614 ISCSI_INITIAL_R2T_EN |
615 ISCSI_MAX_R2T |
616 ISCSI_IMM_DATA_EN |
617 ISCSI_FIRST_BURST |
618 ISCSI_MAX_BURST |
619 ISCSI_PDU_INORDER_EN |
620 ISCSI_DATASEQ_INORDER_EN |
621 ISCSI_EXP_STATSN |
622 ISCSI_PERSISTENT_PORT |
623 ISCSI_PERSISTENT_ADDRESS |
624 ISCSI_TARGET_NAME | ISCSI_TPGT |
625 ISCSI_USERNAME | ISCSI_PASSWORD |
626 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
627 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
628 ISCSI_PING_TMO | ISCSI_RECV_TMO |
629 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
630 .host_param_mask = ISCSI_HOST_HWADDRESS |
631 ISCSI_HOST_NETDEV_NAME |
632 ISCSI_HOST_INITIATOR_NAME,
633
634 .create_session = iscsi_iser_session_create,
635 .destroy_session = iscsi_iser_session_destroy,
636
637 .create_conn = iscsi_iser_conn_create,
638 .bind_conn = iscsi_iser_conn_bind,
639 .destroy_conn = iscsi_iser_conn_destroy,
640 .set_param = iscsi_iser_set_param,
641 .get_conn_param = iscsi_conn_get_param,
642 .get_session_param = iscsi_session_get_param,
643 .start_conn = iscsi_iser_conn_start,
644 .stop_conn = iscsi_iser_conn_stop,
645
646 .get_host_param = iscsi_host_get_param,
647 .set_host_param = iscsi_host_set_param,
648
649 .send_pdu = iscsi_conn_send_pdu,
650 .get_stats = iscsi_iser_conn_get_stats,
651 .init_task = iscsi_iser_task_init,
652 .xmit_task = iscsi_iser_task_xmit,
653 .cleanup_task = iscsi_iser_cleanup_task,
654 .alloc_pdu = iscsi_iser_pdu_alloc,
655
656 .session_recovery_timedout = iscsi_session_recovery_timedout,
657
658 .ep_connect = iscsi_iser_ep_connect,
659 .ep_poll = iscsi_iser_ep_poll,
660 .ep_disconnect = iscsi_iser_ep_disconnect
661};
662
663static int __init iser_init(void)
664{
665 int err;
666
667 iser_dbg("Starting iSER datamover...\n");
668
669 if (iscsi_max_lun < 1) {
670 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
671 return -EINVAL;
672 }
673
674 memset(&ig, 0, sizeof(struct iser_global));
675
676 ig.desc_cache = kmem_cache_create("iser_descriptors",
677 sizeof (struct iser_desc),
678 0, SLAB_HWCACHE_ALIGN,
679 NULL);
680 if (ig.desc_cache == NULL)
681 return -ENOMEM;
682
683
684 mutex_init(&ig.device_list_mutex);
685 INIT_LIST_HEAD(&ig.device_list);
686 mutex_init(&ig.connlist_mutex);
687 INIT_LIST_HEAD(&ig.connlist);
688
689 iscsi_iser_scsi_transport = iscsi_register_transport(
690 &iscsi_iser_transport);
691 if (!iscsi_iser_scsi_transport) {
692 iser_err("iscsi_register_transport failed\n");
693 err = -EINVAL;
694 goto register_transport_failure;
695 }
696
697 return 0;
698
699register_transport_failure:
700 kmem_cache_destroy(ig.desc_cache);
701
702 return err;
703}
704
705static void __exit iser_exit(void)
706{
707 iser_dbg("Removing iSER datamover...\n");
708 iscsi_unregister_transport(&iscsi_iser_transport);
709 kmem_cache_destroy(ig.desc_cache);
710}
711
712module_init(iser_init);
713module_exit(iser_exit);
714