Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / infiniband / ulp / iser / iscsi_iser.c
blobdb43b3117168f0df7c13532dca71cd5289ef6096
1 /*
2 * iSCSI Initiator over iSER Data-Path
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 Mike Christie
7 * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
8 * maintained by openib-general@openib.org
10 * This software is available to you under a choice of one of two
11 * licenses. You may choose to be licensed under the terms of the GNU
12 * General Public License (GPL) Version 2, available from the file
13 * COPYING in the main directory of this source tree, or the
14 * OpenIB.org BSD license below:
16 * Redistribution and use in source and binary forms, with or
17 * without modification, are permitted provided that the following
18 * conditions are met:
20 * - Redistributions of source code must retain the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer.
24 * - Redistributions in binary form must reproduce the above
25 * copyright notice, this list of conditions and the following
26 * disclaimer in the documentation and/or other materials
27 * provided with the distribution.
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 * SOFTWARE.
38 * Credits:
39 * Christoph Hellwig
40 * FUJITA Tomonori
41 * Arne Redlich
42 * Zhenyu Wang
43 * Modified by:
44 * Erez Zilber
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 #include <linux/slab.h>
60 #include <linux/module.h>
62 #include <net/sock.h>
64 #include <asm/uaccess.h>
66 #include <scsi/scsi_cmnd.h>
67 #include <scsi/scsi_device.h>
68 #include <scsi/scsi_eh.h>
69 #include <scsi/scsi_tcq.h>
70 #include <scsi/scsi_host.h>
71 #include <scsi/scsi.h>
72 #include <scsi/scsi_transport_iscsi.h>
74 #include "iscsi_iser.h"
76 static struct scsi_host_template iscsi_iser_sht;
77 static struct iscsi_transport iscsi_iser_transport;
78 static struct scsi_transport_template *iscsi_iser_scsi_transport;
80 static unsigned int iscsi_max_lun = 512;
81 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
83 int iser_debug_level = 0;
85 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
86 "v" DRV_VER " (" DRV_DATE ")");
87 MODULE_LICENSE("Dual BSD/GPL");
88 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
90 module_param_named(debug_level, iser_debug_level, int, 0644);
91 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
93 struct iser_global ig;
95 void
96 iscsi_iser_recv(struct iscsi_conn *conn,
97 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
99 int rc = 0;
100 int datalen;
101 int ahslen;
103 /* verify PDU length */
104 datalen = ntoh24(hdr->dlength);
105 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
106 iser_err("wrong datalen %d (hdr), %d (IB)\n",
107 datalen, rx_data_len);
108 rc = ISCSI_ERR_DATALEN;
109 goto error;
112 if (datalen != rx_data_len)
113 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
114 datalen, rx_data_len);
116 /* read AHS */
117 ahslen = hdr->hlength * 4;
119 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
120 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
121 goto error;
123 return;
124 error:
125 iscsi_conn_failure(conn, rc);
128 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
130 struct iscsi_iser_task *iser_task = task->dd_data;
132 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
133 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
134 return 0;
137 int iser_initialize_task_headers(struct iscsi_task *task,
138 struct iser_tx_desc *tx_desc)
140 struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
141 struct iser_device *device = iser_conn->ib_conn->device;
142 struct iscsi_iser_task *iser_task = task->dd_data;
143 u64 dma_addr;
145 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
146 ISER_HEADERS_LEN, DMA_TO_DEVICE);
147 if (ib_dma_mapping_error(device->ib_device, dma_addr))
148 return -ENOMEM;
150 tx_desc->dma_addr = dma_addr;
151 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
152 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
153 tx_desc->tx_sg[0].lkey = device->mr->lkey;
155 iser_task->iser_conn = iser_conn;
156 return 0;
159 * iscsi_iser_task_init - Initialize task
160 * @task: iscsi task
162 * Initialize the task for the scsi command or mgmt command.
164 static int
165 iscsi_iser_task_init(struct iscsi_task *task)
167 struct iscsi_iser_task *iser_task = task->dd_data;
169 if (iser_initialize_task_headers(task, &iser_task->desc))
170 return -ENOMEM;
172 /* mgmt task */
173 if (!task->sc)
174 return 0;
176 iser_task->command_sent = 0;
177 iser_task_rdma_init(iser_task);
178 return 0;
182 * iscsi_iser_mtask_xmit - xmit management(immediate) task
183 * @conn: iscsi connection
184 * @task: task management task
186 * Notes:
187 * The function can return -EAGAIN in which case caller must
188 * call it again later, or recover. '0' return code means successful
189 * xmit.
192 static int
193 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
195 int error = 0;
197 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
199 error = iser_send_control(conn, task);
201 /* since iser xmits control with zero copy, tasks can not be recycled
202 * right after sending them.
203 * The recycling scheme is based on whether a response is expected
204 * - if yes, the task is recycled at iscsi_complete_pdu
205 * - if no, the task is recycled at iser_snd_completion
207 return error;
210 static int
211 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
212 struct iscsi_task *task)
214 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
215 struct iscsi_data hdr;
216 int error = 0;
218 /* Send data-out PDUs while there's still unsolicited data to send */
219 while (iscsi_task_has_unsol_data(task)) {
220 iscsi_prep_data_out_pdu(task, r2t, &hdr);
221 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
222 hdr.itt, r2t->data_count);
224 /* the buffer description has been passed with the command */
225 /* Send the command */
226 error = iser_send_data_out(conn, task, &hdr);
227 if (error) {
228 r2t->datasn--;
229 goto iscsi_iser_task_xmit_unsol_data_exit;
231 r2t->sent += r2t->data_count;
232 iser_dbg("Need to send %d more as data-out PDUs\n",
233 r2t->data_length - r2t->sent);
236 iscsi_iser_task_xmit_unsol_data_exit:
237 return error;
240 static int
241 iscsi_iser_task_xmit(struct iscsi_task *task)
243 struct iscsi_conn *conn = task->conn;
244 struct iscsi_iser_task *iser_task = task->dd_data;
245 int error = 0;
247 if (!task->sc)
248 return iscsi_iser_mtask_xmit(conn, task);
250 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
251 BUG_ON(scsi_bufflen(task->sc) == 0);
253 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
254 task->itt, scsi_bufflen(task->sc),
255 task->imm_count, task->unsol_r2t.data_length);
258 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
259 conn->id, task->itt);
261 /* Send the cmd PDU */
262 if (!iser_task->command_sent) {
263 error = iser_send_command(conn, task);
264 if (error)
265 goto iscsi_iser_task_xmit_exit;
266 iser_task->command_sent = 1;
269 /* Send unsolicited data-out PDU(s) if necessary */
270 if (iscsi_task_has_unsol_data(task))
271 error = iscsi_iser_task_xmit_unsol_data(conn, task);
273 iscsi_iser_task_xmit_exit:
274 return error;
277 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
279 struct iscsi_iser_task *iser_task = task->dd_data;
280 struct iser_tx_desc *tx_desc = &iser_task->desc;
282 struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
283 struct iser_device *device = iser_conn->ib_conn->device;
285 ib_dma_unmap_single(device->ib_device,
286 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
288 /* mgmt tasks do not need special cleanup */
289 if (!task->sc)
290 return;
292 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
293 iser_task->status = ISER_TASK_STATUS_COMPLETED;
294 iser_task_rdma_finalize(iser_task);
298 static struct iscsi_cls_conn *
299 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
301 struct iscsi_conn *conn;
302 struct iscsi_cls_conn *cls_conn;
303 struct iscsi_iser_conn *iser_conn;
305 cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
306 if (!cls_conn)
307 return NULL;
308 conn = cls_conn->dd_data;
311 * due to issues with the login code re iser sematics
312 * this not set in iscsi_conn_setup - FIXME
314 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
316 iser_conn = conn->dd_data;
317 conn->dd_data = iser_conn;
318 iser_conn->iscsi_conn = conn;
320 return cls_conn;
323 static void
324 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
326 struct iscsi_conn *conn = cls_conn->dd_data;
327 struct iscsi_iser_conn *iser_conn = conn->dd_data;
328 struct iser_conn *ib_conn = iser_conn->ib_conn;
330 iscsi_conn_teardown(cls_conn);
332 * Userspace will normally call the stop callback and
333 * already have freed the ib_conn, but if it goofed up then
334 * we free it here.
336 if (ib_conn) {
337 ib_conn->iser_conn = NULL;
338 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
342 static int
343 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
344 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
345 int is_leading)
347 struct iscsi_conn *conn = cls_conn->dd_data;
348 struct iscsi_iser_conn *iser_conn;
349 struct iser_conn *ib_conn;
350 struct iscsi_endpoint *ep;
351 int error;
353 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
354 if (error)
355 return error;
357 /* the transport ep handle comes from user space so it must be
358 * verified against the global ib connections list */
359 ep = iscsi_lookup_endpoint(transport_eph);
360 if (!ep) {
361 iser_err("can't bind eph %llx\n",
362 (unsigned long long)transport_eph);
363 return -EINVAL;
365 ib_conn = ep->dd_data;
367 if (iser_alloc_rx_descriptors(ib_conn))
368 return -ENOMEM;
370 /* binds the iSER connection retrieved from the previously
371 * connected ep_handle to the iSCSI layer connection. exchanges
372 * connection pointers */
373 iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n",
374 conn, conn->dd_data, ib_conn);
375 iser_conn = conn->dd_data;
376 ib_conn->iser_conn = iser_conn;
377 iser_conn->ib_conn = ib_conn;
378 iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
379 return 0;
382 static void
383 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
385 struct iscsi_conn *conn = cls_conn->dd_data;
386 struct iscsi_iser_conn *iser_conn = conn->dd_data;
387 struct iser_conn *ib_conn = iser_conn->ib_conn;
390 * Userspace may have goofed up and not bound the connection or
391 * might have only partially setup the connection.
393 if (ib_conn) {
394 iscsi_conn_stop(cls_conn, flag);
396 * There is no unbind event so the stop callback
397 * must release the ref from the bind.
399 iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
401 iser_conn->ib_conn = NULL;
404 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
406 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
408 iscsi_session_teardown(cls_session);
409 iscsi_host_remove(shost);
410 iscsi_host_free(shost);
413 static struct iscsi_cls_session *
414 iscsi_iser_session_create(struct iscsi_endpoint *ep,
415 uint16_t cmds_max, uint16_t qdepth,
416 uint32_t initial_cmdsn)
418 struct iscsi_cls_session *cls_session;
419 struct iscsi_session *session;
420 struct Scsi_Host *shost;
421 struct iser_conn *ib_conn;
423 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
424 if (!shost)
425 return NULL;
426 shost->transportt = iscsi_iser_scsi_transport;
427 shost->max_lun = iscsi_max_lun;
428 shost->max_id = 0;
429 shost->max_channel = 0;
430 shost->max_cmd_len = 16;
433 * older userspace tools (before 2.0-870) did not pass us
434 * the leading conn's ep so this will be NULL;
436 if (ep)
437 ib_conn = ep->dd_data;
439 if (iscsi_host_add(shost,
440 ep ? ib_conn->device->ib_device->dma_device : NULL))
441 goto free_host;
444 * we do not support setting can_queue cmd_per_lun from userspace yet
445 * because we preallocate so many resources
447 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
448 ISCSI_DEF_XMIT_CMDS_MAX, 0,
449 sizeof(struct iscsi_iser_task),
450 initial_cmdsn, 0);
451 if (!cls_session)
452 goto remove_host;
453 session = cls_session->dd_data;
455 shost->can_queue = session->scsi_cmds_max;
456 return cls_session;
458 remove_host:
459 iscsi_host_remove(shost);
460 free_host:
461 iscsi_host_free(shost);
462 return NULL;
465 static int
466 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
467 enum iscsi_param param, char *buf, int buflen)
469 int value;
471 switch (param) {
472 case ISCSI_PARAM_MAX_RECV_DLENGTH:
473 /* TBD */
474 break;
475 case ISCSI_PARAM_HDRDGST_EN:
476 sscanf(buf, "%d", &value);
477 if (value) {
478 printk(KERN_ERR "DataDigest wasn't negotiated to None");
479 return -EPROTO;
481 break;
482 case ISCSI_PARAM_DATADGST_EN:
483 sscanf(buf, "%d", &value);
484 if (value) {
485 printk(KERN_ERR "DataDigest wasn't negotiated to None");
486 return -EPROTO;
488 break;
489 case ISCSI_PARAM_IFMARKER_EN:
490 sscanf(buf, "%d", &value);
491 if (value) {
492 printk(KERN_ERR "IFMarker wasn't negotiated to No");
493 return -EPROTO;
495 break;
496 case ISCSI_PARAM_OFMARKER_EN:
497 sscanf(buf, "%d", &value);
498 if (value) {
499 printk(KERN_ERR "OFMarker wasn't negotiated to No");
500 return -EPROTO;
502 break;
503 default:
504 return iscsi_set_param(cls_conn, param, buf, buflen);
507 return 0;
510 static void
511 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
513 struct iscsi_conn *conn = cls_conn->dd_data;
515 stats->txdata_octets = conn->txdata_octets;
516 stats->rxdata_octets = conn->rxdata_octets;
517 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
518 stats->dataout_pdus = conn->dataout_pdus_cnt;
519 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
520 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
521 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
522 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
523 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
524 stats->custom_length = 4;
525 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
526 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
527 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
528 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
529 strcpy(stats->custom[2].desc, "eh_abort_cnt");
530 stats->custom[2].value = conn->eh_abort_cnt;
531 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
532 stats->custom[3].value = conn->fmr_unalign_cnt;
535 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
536 enum iscsi_param param, char *buf)
538 struct iser_conn *ib_conn = ep->dd_data;
539 int len;
541 switch (param) {
542 case ISCSI_PARAM_CONN_PORT:
543 case ISCSI_PARAM_CONN_ADDRESS:
544 if (!ib_conn || !ib_conn->cma_id)
545 return -ENOTCONN;
547 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
548 &ib_conn->cma_id->route.addr.dst_addr,
549 param, buf);
550 break;
551 default:
552 return -ENOSYS;
555 return len;
558 static struct iscsi_endpoint *
559 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
560 int non_blocking)
562 int err;
563 struct iser_conn *ib_conn;
564 struct iscsi_endpoint *ep;
566 ep = iscsi_create_endpoint(sizeof(*ib_conn));
567 if (!ep)
568 return ERR_PTR(-ENOMEM);
570 ib_conn = ep->dd_data;
571 ib_conn->ep = ep;
572 iser_conn_init(ib_conn);
574 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
575 non_blocking);
576 if (err) {
577 iscsi_destroy_endpoint(ep);
578 return ERR_PTR(err);
580 return ep;
583 static int
584 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
586 struct iser_conn *ib_conn;
587 int rc;
589 ib_conn = ep->dd_data;
590 rc = wait_event_interruptible_timeout(ib_conn->wait,
591 ib_conn->state == ISER_CONN_UP,
592 msecs_to_jiffies(timeout_ms));
594 /* if conn establishment failed, return error code to iscsi */
595 if (!rc &&
596 (ib_conn->state == ISER_CONN_TERMINATING ||
597 ib_conn->state == ISER_CONN_DOWN))
598 rc = -1;
600 iser_err("ib conn %p rc = %d\n", ib_conn, rc);
602 if (rc > 0)
603 return 1; /* success, this is the equivalent of POLLOUT */
604 else if (!rc)
605 return 0; /* timeout */
606 else
607 return rc; /* signal */
610 static void
611 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
613 struct iser_conn *ib_conn;
615 ib_conn = ep->dd_data;
616 if (ib_conn->iser_conn)
618 * Must suspend xmit path if the ep is bound to the
619 * iscsi_conn, so we know we are not accessing the ib_conn
620 * when we free it.
622 * This may not be bound if the ep poll failed.
624 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
627 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
628 iser_conn_terminate(ib_conn);
631 static umode_t iser_attr_is_visible(int param_type, int param)
633 switch (param_type) {
634 case ISCSI_HOST_PARAM:
635 switch (param) {
636 case ISCSI_HOST_PARAM_NETDEV_NAME:
637 case ISCSI_HOST_PARAM_HWADDRESS:
638 case ISCSI_HOST_PARAM_INITIATOR_NAME:
639 return S_IRUGO;
640 default:
641 return 0;
643 case ISCSI_PARAM:
644 switch (param) {
645 case ISCSI_PARAM_MAX_RECV_DLENGTH:
646 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
647 case ISCSI_PARAM_HDRDGST_EN:
648 case ISCSI_PARAM_DATADGST_EN:
649 case ISCSI_PARAM_CONN_ADDRESS:
650 case ISCSI_PARAM_CONN_PORT:
651 case ISCSI_PARAM_EXP_STATSN:
652 case ISCSI_PARAM_PERSISTENT_ADDRESS:
653 case ISCSI_PARAM_PERSISTENT_PORT:
654 case ISCSI_PARAM_PING_TMO:
655 case ISCSI_PARAM_RECV_TMO:
656 case ISCSI_PARAM_INITIAL_R2T_EN:
657 case ISCSI_PARAM_MAX_R2T:
658 case ISCSI_PARAM_IMM_DATA_EN:
659 case ISCSI_PARAM_FIRST_BURST:
660 case ISCSI_PARAM_MAX_BURST:
661 case ISCSI_PARAM_PDU_INORDER_EN:
662 case ISCSI_PARAM_DATASEQ_INORDER_EN:
663 case ISCSI_PARAM_TARGET_NAME:
664 case ISCSI_PARAM_TPGT:
665 case ISCSI_PARAM_USERNAME:
666 case ISCSI_PARAM_PASSWORD:
667 case ISCSI_PARAM_USERNAME_IN:
668 case ISCSI_PARAM_PASSWORD_IN:
669 case ISCSI_PARAM_FAST_ABORT:
670 case ISCSI_PARAM_ABORT_TMO:
671 case ISCSI_PARAM_LU_RESET_TMO:
672 case ISCSI_PARAM_TGT_RESET_TMO:
673 case ISCSI_PARAM_IFACE_NAME:
674 case ISCSI_PARAM_INITIATOR_NAME:
675 return S_IRUGO;
676 default:
677 return 0;
681 return 0;
684 static struct scsi_host_template iscsi_iser_sht = {
685 .module = THIS_MODULE,
686 .name = "iSCSI Initiator over iSER, v." DRV_VER,
687 .queuecommand = iscsi_queuecommand,
688 .change_queue_depth = iscsi_change_queue_depth,
689 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
690 .max_sectors = 1024,
691 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
692 .eh_abort_handler = iscsi_eh_abort,
693 .eh_device_reset_handler= iscsi_eh_device_reset,
694 .eh_target_reset_handler = iscsi_eh_recover_target,
695 .target_alloc = iscsi_target_alloc,
696 .use_clustering = DISABLE_CLUSTERING,
697 .proc_name = "iscsi_iser",
698 .this_id = -1,
701 static struct iscsi_transport iscsi_iser_transport = {
702 .owner = THIS_MODULE,
703 .name = "iser",
704 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
705 /* session management */
706 .create_session = iscsi_iser_session_create,
707 .destroy_session = iscsi_iser_session_destroy,
708 /* connection management */
709 .create_conn = iscsi_iser_conn_create,
710 .bind_conn = iscsi_iser_conn_bind,
711 .destroy_conn = iscsi_iser_conn_destroy,
712 .attr_is_visible = iser_attr_is_visible,
713 .set_param = iscsi_iser_set_param,
714 .get_conn_param = iscsi_conn_get_param,
715 .get_ep_param = iscsi_iser_get_ep_param,
716 .get_session_param = iscsi_session_get_param,
717 .start_conn = iscsi_conn_start,
718 .stop_conn = iscsi_iser_conn_stop,
719 /* iscsi host params */
720 .get_host_param = iscsi_host_get_param,
721 .set_host_param = iscsi_host_set_param,
722 /* IO */
723 .send_pdu = iscsi_conn_send_pdu,
724 .get_stats = iscsi_iser_conn_get_stats,
725 .init_task = iscsi_iser_task_init,
726 .xmit_task = iscsi_iser_task_xmit,
727 .cleanup_task = iscsi_iser_cleanup_task,
728 .alloc_pdu = iscsi_iser_pdu_alloc,
729 /* recovery */
730 .session_recovery_timedout = iscsi_session_recovery_timedout,
732 .ep_connect = iscsi_iser_ep_connect,
733 .ep_poll = iscsi_iser_ep_poll,
734 .ep_disconnect = iscsi_iser_ep_disconnect
737 static int __init iser_init(void)
739 int err;
741 iser_dbg("Starting iSER datamover...\n");
743 if (iscsi_max_lun < 1) {
744 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
745 return -EINVAL;
748 memset(&ig, 0, sizeof(struct iser_global));
750 ig.desc_cache = kmem_cache_create("iser_descriptors",
751 sizeof(struct iser_tx_desc),
752 0, SLAB_HWCACHE_ALIGN,
753 NULL);
754 if (ig.desc_cache == NULL)
755 return -ENOMEM;
757 /* device init is called only after the first addr resolution */
758 mutex_init(&ig.device_list_mutex);
759 INIT_LIST_HEAD(&ig.device_list);
760 mutex_init(&ig.connlist_mutex);
761 INIT_LIST_HEAD(&ig.connlist);
763 iscsi_iser_scsi_transport = iscsi_register_transport(
764 &iscsi_iser_transport);
765 if (!iscsi_iser_scsi_transport) {
766 iser_err("iscsi_register_transport failed\n");
767 err = -EINVAL;
768 goto register_transport_failure;
771 return 0;
773 register_transport_failure:
774 kmem_cache_destroy(ig.desc_cache);
776 return err;
779 static void __exit iser_exit(void)
781 iser_dbg("Removing iSER datamover...\n");
782 iscsi_unregister_transport(&iscsi_iser_transport);
783 kmem_cache_destroy(ig.desc_cache);
786 module_init(iser_init);
787 module_exit(iser_exit);