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IB/iser: Fix possible NULL derefernce ib_conn->device in session_create
[deliverable/linux.git] / drivers / infiniband / ulp / iser / iscsi_iser.c
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1/*
2 * iSCSI Initiator over iSER Data-Path
3 *
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 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
9 * maintained by openib-general@openib.org
10 *
11 * This software is available to you under a choice of one of two
12 * licenses. You may choose to be licensed under the terms of the GNU
13 * General Public License (GPL) Version 2, available from the file
14 * COPYING in the main directory of this source tree, or the
15 * OpenIB.org BSD license below:
16 *
17 * Redistribution and use in source and binary forms, with or
18 * without modification, are permitted provided that the following
19 * conditions are met:
20 *
21 * - Redistributions of source code must retain the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer.
24 *
25 * - Redistributions in binary form must reproduce the above
26 * copyright notice, this list of conditions and the following
27 * disclaimer in the documentation and/or other materials
28 * provided with the distribution.
29 *
30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
31 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
32 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
33 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
34 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
36 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
37 * SOFTWARE.
38 *
39 * Credits:
40 * Christoph Hellwig
41 * FUJITA Tomonori
42 * Arne Redlich
43 * Zhenyu Wang
44 * Modified by:
45 * Erez Zilber
46 */
47
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 <asm/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
77static struct scsi_host_template iscsi_iser_sht;
78static struct iscsi_transport iscsi_iser_transport;
79static struct scsi_transport_template *iscsi_iser_scsi_transport;
80
81static unsigned int iscsi_max_lun = 512;
82module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
83
84int iser_debug_level = 0;
85bool iser_pi_enable = false;
86int iser_pi_guard = 1;
87
88MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
89MODULE_LICENSE("Dual BSD/GPL");
90MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
91MODULE_VERSION(DRV_VER);
92
93module_param_named(debug_level, iser_debug_level, int, 0644);
94MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
95
96module_param_named(pi_enable, iser_pi_enable, bool, 0644);
97MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
98
99module_param_named(pi_guard, iser_pi_guard, int, 0644);
100MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:IP_CSUM)");
101
102static struct workqueue_struct *release_wq;
103struct iser_global ig;
104
105/*
106 * iscsi_iser_recv() - Process a successfull recv completion
107 * @conn: iscsi connection
108 * @hdr: iscsi header
109 * @rx_data: buffer containing receive data payload
110 * @rx_data_len: length of rx_data
111 *
112 * Notes: In case of data length errors or iscsi PDU completion failures
113 * this routine will signal iscsi layer of connection failure.
114 */
115void
116iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
117 char *rx_data, int rx_data_len)
118{
119 int rc = 0;
120 int datalen;
121 int ahslen;
122
123 /* verify PDU length */
124 datalen = ntoh24(hdr->dlength);
125 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
126 iser_err("wrong datalen %d (hdr), %d (IB)\n",
127 datalen, rx_data_len);
128 rc = ISCSI_ERR_DATALEN;
129 goto error;
130 }
131
132 if (datalen != rx_data_len)
133 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
134 datalen, rx_data_len);
135
136 /* read AHS */
137 ahslen = hdr->hlength * 4;
138
139 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
140 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
141 goto error;
142
143 return;
144error:
145 iscsi_conn_failure(conn, rc);
146}
147
148/**
149 * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU
150 * @task: iscsi task
151 * @opcode: iscsi command opcode
152 *
153 * Netes: This routine can't fail, just assign iscsi task
154 * hdr and max hdr size.
155 */
156static int
157iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
158{
159 struct iscsi_iser_task *iser_task = task->dd_data;
160
161 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
162 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
163
164 return 0;
165}
166
167int iser_initialize_task_headers(struct iscsi_task *task,
168 struct iser_tx_desc *tx_desc)
169{
170 struct iser_conn *iser_conn = task->conn->dd_data;
171 struct iser_device *device = iser_conn->ib_conn.device;
172 struct iscsi_iser_task *iser_task = task->dd_data;
173 u64 dma_addr;
174
175 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
176 ISER_HEADERS_LEN, DMA_TO_DEVICE);
177 if (ib_dma_mapping_error(device->ib_device, dma_addr))
178 return -ENOMEM;
179
180 tx_desc->dma_addr = dma_addr;
181 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
182 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
183 tx_desc->tx_sg[0].lkey = device->mr->lkey;
184
185 iser_task->iser_conn = iser_conn;
186 return 0;
187}
188
189/**
190 * iscsi_iser_task_init() - Initialize iscsi-iser task
191 * @task: iscsi task
192 *
193 * Initialize the task for the scsi command or mgmt command.
194 *
195 * Return: Returns zero on success or -ENOMEM when failing
196 * to init task headers (dma mapping error).
197 */
198static int
199iscsi_iser_task_init(struct iscsi_task *task)
200{
201 struct iscsi_iser_task *iser_task = task->dd_data;
202
203 if (iser_initialize_task_headers(task, &iser_task->desc))
204 return -ENOMEM;
205
206 /* mgmt task */
207 if (!task->sc)
208 return 0;
209
210 iser_task->command_sent = 0;
211 iser_task_rdma_init(iser_task);
212 iser_task->sc = task->sc;
213
214 return 0;
215}
216
217/**
218 * iscsi_iser_mtask_xmit() - xmit management (immediate) task
219 * @conn: iscsi connection
220 * @task: task management task
221 *
222 * Notes:
223 * The function can return -EAGAIN in which case caller must
224 * call it again later, or recover. '0' return code means successful
225 * xmit.
226 *
227 **/
228static int
229iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
230{
231 int error = 0;
232
233 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
234
235 error = iser_send_control(conn, task);
236
237 /* since iser xmits control with zero copy, tasks can not be recycled
238 * right after sending them.
239 * The recycling scheme is based on whether a response is expected
240 * - if yes, the task is recycled at iscsi_complete_pdu
241 * - if no, the task is recycled at iser_snd_completion
242 */
243 return error;
244}
245
246static int
247iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
248 struct iscsi_task *task)
249{
250 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
251 struct iscsi_data hdr;
252 int error = 0;
253
254 /* Send data-out PDUs while there's still unsolicited data to send */
255 while (iscsi_task_has_unsol_data(task)) {
256 iscsi_prep_data_out_pdu(task, r2t, &hdr);
257 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
258 hdr.itt, r2t->data_count);
259
260 /* the buffer description has been passed with the command */
261 /* Send the command */
262 error = iser_send_data_out(conn, task, &hdr);
263 if (error) {
264 r2t->datasn--;
265 goto iscsi_iser_task_xmit_unsol_data_exit;
266 }
267 r2t->sent += r2t->data_count;
268 iser_dbg("Need to send %d more as data-out PDUs\n",
269 r2t->data_length - r2t->sent);
270 }
271
272iscsi_iser_task_xmit_unsol_data_exit:
273 return error;
274}
275
276/**
277 * iscsi_iser_task_xmit() - xmit iscsi-iser task
278 * @task: iscsi task
279 *
280 * Return: zero on success or escalates $error on failure.
281 */
282static int
283iscsi_iser_task_xmit(struct iscsi_task *task)
284{
285 struct iscsi_conn *conn = task->conn;
286 struct iscsi_iser_task *iser_task = task->dd_data;
287 int error = 0;
288
289 if (!task->sc)
290 return iscsi_iser_mtask_xmit(conn, task);
291
292 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
293 BUG_ON(scsi_bufflen(task->sc) == 0);
294
295 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
296 task->itt, scsi_bufflen(task->sc),
297 task->imm_count, task->unsol_r2t.data_length);
298 }
299
300 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
301 conn->id, task->itt);
302
303 /* Send the cmd PDU */
304 if (!iser_task->command_sent) {
305 error = iser_send_command(conn, task);
306 if (error)
307 goto iscsi_iser_task_xmit_exit;
308 iser_task->command_sent = 1;
309 }
310
311 /* Send unsolicited data-out PDU(s) if necessary */
312 if (iscsi_task_has_unsol_data(task))
313 error = iscsi_iser_task_xmit_unsol_data(conn, task);
314
315 iscsi_iser_task_xmit_exit:
316 return error;
317}
318
319/**
320 * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task
321 * @task: iscsi task
322 *
323 * Notes: In case the RDMA device is already NULL (might have
324 * been removed in DEVICE_REMOVAL CM event it will bail-out
325 * without doing dma unmapping.
326 */
327static void iscsi_iser_cleanup_task(struct iscsi_task *task)
328{
329 struct iscsi_iser_task *iser_task = task->dd_data;
330 struct iser_tx_desc *tx_desc = &iser_task->desc;
331 struct iser_conn *iser_conn = task->conn->dd_data;
332 struct iser_device *device = iser_conn->ib_conn.device;
333
334 /* DEVICE_REMOVAL event might have already released the device */
335 if (!device)
336 return;
337
338 ib_dma_unmap_single(device->ib_device,
339 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
340
341 /* mgmt tasks do not need special cleanup */
342 if (!task->sc)
343 return;
344
345 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
346 iser_task->status = ISER_TASK_STATUS_COMPLETED;
347 iser_task_rdma_finalize(iser_task);
348 }
349}
350
351/**
352 * iscsi_iser_check_protection() - check protection information status of task.
353 * @task: iscsi task
354 * @sector: error sector if exsists (output)
355 *
356 * Return: zero if no data-integrity errors have occured
357 * 0x1: data-integrity error occured in the guard-block
358 * 0x2: data-integrity error occured in the reference tag
359 * 0x3: data-integrity error occured in the application tag
360 *
361 * In addition the error sector is marked.
362 */
363static u8
364iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
365{
366 struct iscsi_iser_task *iser_task = task->dd_data;
367
368 if (iser_task->dir[ISER_DIR_IN])
369 return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
370 sector);
371 else
372 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
373 sector);
374}
375
376/**
377 * iscsi_iser_conn_create() - create a new iscsi-iser connection
378 * @cls_session: iscsi class connection
379 * @conn_idx: connection index within the session (for MCS)
380 *
381 * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL
382 * otherwise.
383 */
384static struct iscsi_cls_conn *
385iscsi_iser_conn_create(struct iscsi_cls_session *cls_session,
386 uint32_t conn_idx)
387{
388 struct iscsi_conn *conn;
389 struct iscsi_cls_conn *cls_conn;
390
391 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
392 if (!cls_conn)
393 return NULL;
394 conn = cls_conn->dd_data;
395
396 /*
397 * due to issues with the login code re iser sematics
398 * this not set in iscsi_conn_setup - FIXME
399 */
400 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
401
402 return cls_conn;
403}
404
405/**
406 * iscsi_iser_conn_bind() - bind iscsi and iser connection structures
407 * @cls_session: iscsi class session
408 * @cls_conn: iscsi class connection
409 * @transport_eph: transport end-point handle
410 * @is_leading: indicate if this is the session leading connection (MCS)
411 *
412 * Return: zero on success, $error if iscsi_conn_bind fails and
413 * -EINVAL in case end-point doesn't exsits anymore or iser connection
414 * state is not UP (teardown already started).
415 */
416static int
417iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
418 struct iscsi_cls_conn *cls_conn,
419 uint64_t transport_eph,
420 int is_leading)
421{
422 struct iscsi_conn *conn = cls_conn->dd_data;
423 struct iser_conn *iser_conn;
424 struct iscsi_endpoint *ep;
425 int error;
426
427 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
428 if (error)
429 return error;
430
431 /* the transport ep handle comes from user space so it must be
432 * verified against the global ib connections list */
433 ep = iscsi_lookup_endpoint(transport_eph);
434 if (!ep) {
435 iser_err("can't bind eph %llx\n",
436 (unsigned long long)transport_eph);
437 return -EINVAL;
438 }
439 iser_conn = ep->dd_data;
440
441 mutex_lock(&iser_conn->state_mutex);
442 if (iser_conn->state != ISER_CONN_UP) {
443 error = -EINVAL;
444 iser_err("iser_conn %p state is %d, teardown started\n",
445 iser_conn, iser_conn->state);
446 goto out;
447 }
448
449 error = iser_alloc_rx_descriptors(iser_conn, conn->session);
450 if (error)
451 goto out;
452
453 /* binds the iSER connection retrieved from the previously
454 * connected ep_handle to the iSCSI layer connection. exchanges
455 * connection pointers */
456 iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn);
457
458 conn->dd_data = iser_conn;
459 iser_conn->iscsi_conn = conn;
460
461out:
462 mutex_unlock(&iser_conn->state_mutex);
463 return error;
464}
465
466/**
467 * iscsi_iser_conn_start() - start iscsi-iser connection
468 * @cls_conn: iscsi class connection
469 *
470 * Notes: Here iser intialize (or re-initialize) stop_completion as
471 * from this point iscsi must call conn_stop in session/connection
472 * teardown so iser transport must wait for it.
473 */
474static int
475iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
476{
477 struct iscsi_conn *iscsi_conn;
478 struct iser_conn *iser_conn;
479
480 iscsi_conn = cls_conn->dd_data;
481 iser_conn = iscsi_conn->dd_data;
482 reinit_completion(&iser_conn->stop_completion);
483
484 return iscsi_conn_start(cls_conn);
485}
486
487/**
488 * iscsi_iser_conn_stop() - stop iscsi-iser connection
489 * @cls_conn: iscsi class connection
490 * @flag: indicate if recover or terminate (passed as is)
491 *
492 * Notes: Calling iscsi_conn_stop might theoretically race with
493 * DEVICE_REMOVAL event and dereference a previously freed RDMA device
494 * handle, so we call it under iser the state lock to protect against
495 * this kind of race.
496 */
497static void
498iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
499{
500 struct iscsi_conn *conn = cls_conn->dd_data;
501 struct iser_conn *iser_conn = conn->dd_data;
502
503 iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn);
504
505 /*
506 * Userspace may have goofed up and not bound the connection or
507 * might have only partially setup the connection.
508 */
509 if (iser_conn) {
510 mutex_lock(&iser_conn->state_mutex);
511 iscsi_conn_stop(cls_conn, flag);
512 iser_conn_terminate(iser_conn);
513
514 /* unbind */
515 iser_conn->iscsi_conn = NULL;
516 conn->dd_data = NULL;
517
518 complete(&iser_conn->stop_completion);
519 mutex_unlock(&iser_conn->state_mutex);
520 } else {
521 iscsi_conn_stop(cls_conn, flag);
522 }
523}
524
525/**
526 * iscsi_iser_session_destroy() - destroy iscsi-iser session
527 * @cls_session: iscsi class session
528 *
529 * Removes and free iscsi host.
530 */
531static void
532iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
533{
534 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
535
536 iscsi_session_teardown(cls_session);
537 iscsi_host_remove(shost);
538 iscsi_host_free(shost);
539}
540
541static inline unsigned int
542iser_dif_prot_caps(int prot_caps)
543{
544 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
545 SHOST_DIX_TYPE1_PROTECTION : 0) |
546 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
547 SHOST_DIX_TYPE2_PROTECTION : 0) |
548 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
549 SHOST_DIX_TYPE3_PROTECTION : 0);
550}
551
552/**
553 * iscsi_iser_session_create() - create an iscsi-iser session
554 * @ep: iscsi end-point handle
555 * @cmds_max: maximum commands in this session
556 * @qdepth: session command queue depth
557 * @initial_cmdsn: initiator command sequnce number
558 *
559 * Allocates and adds a scsi host, expose DIF supprot if
560 * exists, and sets up an iscsi session.
561 */
562static struct iscsi_cls_session *
563iscsi_iser_session_create(struct iscsi_endpoint *ep,
564 uint16_t cmds_max, uint16_t qdepth,
565 uint32_t initial_cmdsn)
566{
567 struct iscsi_cls_session *cls_session;
568 struct iscsi_session *session;
569 struct Scsi_Host *shost;
570 struct iser_conn *iser_conn = NULL;
571 struct ib_conn *ib_conn;
572 u16 max_cmds;
573
574 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
575 if (!shost)
576 return NULL;
577 shost->transportt = iscsi_iser_scsi_transport;
578 shost->cmd_per_lun = qdepth;
579 shost->max_lun = iscsi_max_lun;
580 shost->max_id = 0;
581 shost->max_channel = 0;
582 shost->max_cmd_len = 16;
583
584 /*
585 * older userspace tools (before 2.0-870) did not pass us
586 * the leading conn's ep so this will be NULL;
587 */
588 if (ep) {
589 iser_conn = ep->dd_data;
590 max_cmds = iser_conn->max_cmds;
591
592 mutex_lock(&iser_conn->state_mutex);
593 if (iser_conn->state != ISER_CONN_UP) {
594 iser_err("iser conn %p already started teardown\n",
595 iser_conn);
596 mutex_unlock(&iser_conn->state_mutex);
597 goto free_host;
598 }
599
600 ib_conn = &iser_conn->ib_conn;
601 if (ib_conn->pi_support) {
602 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
603
604 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
605 if (iser_pi_guard)
606 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
607 else
608 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
609 }
610
611 if (iscsi_host_add(shost,
612 ib_conn->device->ib_device->dma_device)) {
613 mutex_unlock(&iser_conn->state_mutex);
614 goto free_host;
615 }
616 mutex_unlock(&iser_conn->state_mutex);
617 } else {
618 max_cmds = ISER_DEF_XMIT_CMDS_MAX;
619 if (iscsi_host_add(shost, NULL))
620 goto free_host;
621 }
622
623 if (cmds_max > max_cmds) {
624 iser_info("cmds_max changed from %u to %u\n",
625 cmds_max, max_cmds);
626 cmds_max = max_cmds;
627 }
628
629 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
630 cmds_max, 0,
631 sizeof(struct iscsi_iser_task),
632 initial_cmdsn, 0);
633 if (!cls_session)
634 goto remove_host;
635 session = cls_session->dd_data;
636
637 shost->can_queue = session->scsi_cmds_max;
638 return cls_session;
639
640remove_host:
641 iscsi_host_remove(shost);
642free_host:
643 iscsi_host_free(shost);
644 return NULL;
645}
646
647static int
648iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
649 enum iscsi_param param, char *buf, int buflen)
650{
651 int value;
652
653 switch (param) {
654 case ISCSI_PARAM_MAX_RECV_DLENGTH:
655 /* TBD */
656 break;
657 case ISCSI_PARAM_HDRDGST_EN:
658 sscanf(buf, "%d", &value);
659 if (value) {
660 iser_err("DataDigest wasn't negotiated to None\n");
661 return -EPROTO;
662 }
663 break;
664 case ISCSI_PARAM_DATADGST_EN:
665 sscanf(buf, "%d", &value);
666 if (value) {
667 iser_err("DataDigest wasn't negotiated to None\n");
668 return -EPROTO;
669 }
670 break;
671 case ISCSI_PARAM_IFMARKER_EN:
672 sscanf(buf, "%d", &value);
673 if (value) {
674 iser_err("IFMarker wasn't negotiated to No\n");
675 return -EPROTO;
676 }
677 break;
678 case ISCSI_PARAM_OFMARKER_EN:
679 sscanf(buf, "%d", &value);
680 if (value) {
681 iser_err("OFMarker wasn't negotiated to No\n");
682 return -EPROTO;
683 }
684 break;
685 default:
686 return iscsi_set_param(cls_conn, param, buf, buflen);
687 }
688
689 return 0;
690}
691
692/**
693 * iscsi_iser_set_param() - set class connection parameter
694 * @cls_conn: iscsi class connection
695 * @stats: iscsi stats to output
696 *
697 * Output connection statistics.
698 */
699static void
700iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
701{
702 struct iscsi_conn *conn = cls_conn->dd_data;
703
704 stats->txdata_octets = conn->txdata_octets;
705 stats->rxdata_octets = conn->rxdata_octets;
706 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
707 stats->dataout_pdus = conn->dataout_pdus_cnt;
708 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
709 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
710 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
711 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
712 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
713 stats->custom_length = 4;
714 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
715 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
716 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
717 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
718 strcpy(stats->custom[2].desc, "eh_abort_cnt");
719 stats->custom[2].value = conn->eh_abort_cnt;
720 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
721 stats->custom[3].value = conn->fmr_unalign_cnt;
722}
723
724static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
725 enum iscsi_param param, char *buf)
726{
727 struct iser_conn *iser_conn = ep->dd_data;
728 int len;
729
730 switch (param) {
731 case ISCSI_PARAM_CONN_PORT:
732 case ISCSI_PARAM_CONN_ADDRESS:
733 if (!iser_conn || !iser_conn->ib_conn.cma_id)
734 return -ENOTCONN;
735
736 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
737 &iser_conn->ib_conn.cma_id->route.addr.dst_addr,
738 param, buf);
739 break;
740 default:
741 return -ENOSYS;
742 }
743
744 return len;
745}
746
747/**
748 * iscsi_iser_ep_connect() - Initiate iSER connection establishment
749 * @shost: scsi_host
750 * @dst_addr: destination address
751 * @non-blocking: indicate if routine can block
752 *
753 * Allocate an iscsi endpoint, an iser_conn structure and bind them.
754 * After that start RDMA connection establishment via rdma_cm. We
755 * don't allocate iser_conn embedded in iscsi_endpoint since in teardown
756 * the endpoint will be destroyed at ep_disconnect while iser_conn will
757 * cleanup its resources asynchronuously.
758 *
759 * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error)
760 * if fails.
761 */
762static struct iscsi_endpoint *
763iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
764 int non_blocking)
765{
766 int err;
767 struct iser_conn *iser_conn;
768 struct iscsi_endpoint *ep;
769
770 ep = iscsi_create_endpoint(0);
771 if (!ep)
772 return ERR_PTR(-ENOMEM);
773
774 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
775 if (!iser_conn) {
776 err = -ENOMEM;
777 goto failure;
778 }
779
780 ep->dd_data = iser_conn;
781 iser_conn->ep = ep;
782 iser_conn_init(iser_conn);
783
784 err = iser_connect(iser_conn, NULL, dst_addr, non_blocking);
785 if (err)
786 goto failure;
787
788 return ep;
789failure:
790 iscsi_destroy_endpoint(ep);
791 return ERR_PTR(err);
792}
793
794/**
795 * iscsi_iser_ep_poll() - poll for iser connection establishment to complete
796 * @ep: iscsi endpoint (created at ep_connect)
797 * @timeout_ms: polling timeout allowed in ms.
798 *
799 * This routine boils down to waiting for up_completion signaling
800 * that cma_id got CONNECTED event.
801 *
802 * Return: 1 if succeeded in connection establishment, 0 if timeout expired
803 * (libiscsi will retry will kick in) or -1 if interrupted by signal
804 * or more likely iser connection state transitioned to TEMINATING or
805 * DOWN during the wait period.
806 */
807static int
808iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
809{
810 struct iser_conn *iser_conn;
811 int rc;
812
813 iser_conn = ep->dd_data;
814 rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion,
815 msecs_to_jiffies(timeout_ms));
816 /* if conn establishment failed, return error code to iscsi */
817 if (rc == 0) {
818 mutex_lock(&iser_conn->state_mutex);
819 if (iser_conn->state == ISER_CONN_TERMINATING ||
820 iser_conn->state == ISER_CONN_DOWN)
821 rc = -1;
822 mutex_unlock(&iser_conn->state_mutex);
823 }
824
825 iser_info("ib conn %p rc = %d\n", iser_conn, rc);
826
827 if (rc > 0)
828 return 1; /* success, this is the equivalent of POLLOUT */
829 else if (!rc)
830 return 0; /* timeout */
831 else
832 return rc; /* signal */
833}
834
835/**
836 * iscsi_iser_ep_disconnect() - Initiate connection teardown process
837 * @ep: iscsi endpoint handle
838 *
839 * This routine is not blocked by iser and RDMA termination process
840 * completion as we queue a deffered work for iser/RDMA destruction
841 * and cleanup or actually call it immediately in case we didn't pass
842 * iscsi conn bind/start stage, thus it is safe.
843 */
844static void
845iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
846{
847 struct iser_conn *iser_conn;
848
849 iser_conn = ep->dd_data;
850 iser_info("ep %p iser conn %p state %d\n",
851 ep, iser_conn, iser_conn->state);
852
853 mutex_lock(&iser_conn->state_mutex);
854 iser_conn_terminate(iser_conn);
855
856 /*
857 * if iser_conn and iscsi_conn are bound, we must wait for
858 * iscsi_conn_stop and flush errors completion before freeing
859 * the iser resources. Otherwise we are safe to free resources
860 * immediately.
861 */
862 if (iser_conn->iscsi_conn) {
863 INIT_WORK(&iser_conn->release_work, iser_release_work);
864 queue_work(release_wq, &iser_conn->release_work);
865 mutex_unlock(&iser_conn->state_mutex);
866 } else {
867 iser_conn->state = ISER_CONN_DOWN;
868 mutex_unlock(&iser_conn->state_mutex);
869 iser_conn_release(iser_conn);
870 }
871 iscsi_destroy_endpoint(ep);
872}
873
874static umode_t iser_attr_is_visible(int param_type, int param)
875{
876 switch (param_type) {
877 case ISCSI_HOST_PARAM:
878 switch (param) {
879 case ISCSI_HOST_PARAM_NETDEV_NAME:
880 case ISCSI_HOST_PARAM_HWADDRESS:
881 case ISCSI_HOST_PARAM_INITIATOR_NAME:
882 return S_IRUGO;
883 default:
884 return 0;
885 }
886 case ISCSI_PARAM:
887 switch (param) {
888 case ISCSI_PARAM_MAX_RECV_DLENGTH:
889 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
890 case ISCSI_PARAM_HDRDGST_EN:
891 case ISCSI_PARAM_DATADGST_EN:
892 case ISCSI_PARAM_CONN_ADDRESS:
893 case ISCSI_PARAM_CONN_PORT:
894 case ISCSI_PARAM_EXP_STATSN:
895 case ISCSI_PARAM_PERSISTENT_ADDRESS:
896 case ISCSI_PARAM_PERSISTENT_PORT:
897 case ISCSI_PARAM_PING_TMO:
898 case ISCSI_PARAM_RECV_TMO:
899 case ISCSI_PARAM_INITIAL_R2T_EN:
900 case ISCSI_PARAM_MAX_R2T:
901 case ISCSI_PARAM_IMM_DATA_EN:
902 case ISCSI_PARAM_FIRST_BURST:
903 case ISCSI_PARAM_MAX_BURST:
904 case ISCSI_PARAM_PDU_INORDER_EN:
905 case ISCSI_PARAM_DATASEQ_INORDER_EN:
906 case ISCSI_PARAM_TARGET_NAME:
907 case ISCSI_PARAM_TPGT:
908 case ISCSI_PARAM_USERNAME:
909 case ISCSI_PARAM_PASSWORD:
910 case ISCSI_PARAM_USERNAME_IN:
911 case ISCSI_PARAM_PASSWORD_IN:
912 case ISCSI_PARAM_FAST_ABORT:
913 case ISCSI_PARAM_ABORT_TMO:
914 case ISCSI_PARAM_LU_RESET_TMO:
915 case ISCSI_PARAM_TGT_RESET_TMO:
916 case ISCSI_PARAM_IFACE_NAME:
917 case ISCSI_PARAM_INITIATOR_NAME:
918 case ISCSI_PARAM_DISCOVERY_SESS:
919 return S_IRUGO;
920 default:
921 return 0;
922 }
923 }
924
925 return 0;
926}
927
928static struct scsi_host_template iscsi_iser_sht = {
929 .module = THIS_MODULE,
930 .name = "iSCSI Initiator over iSER",
931 .queuecommand = iscsi_queuecommand,
932 .change_queue_depth = scsi_change_queue_depth,
933 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
934 .max_sectors = 1024,
935 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
936 .eh_abort_handler = iscsi_eh_abort,
937 .eh_device_reset_handler= iscsi_eh_device_reset,
938 .eh_target_reset_handler = iscsi_eh_recover_target,
939 .target_alloc = iscsi_target_alloc,
940 .use_clustering = DISABLE_CLUSTERING,
941 .proc_name = "iscsi_iser",
942 .this_id = -1,
943 .track_queue_depth = 1,
944};
945
946static struct iscsi_transport iscsi_iser_transport = {
947 .owner = THIS_MODULE,
948 .name = "iser",
949 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
950 /* session management */
951 .create_session = iscsi_iser_session_create,
952 .destroy_session = iscsi_iser_session_destroy,
953 /* connection management */
954 .create_conn = iscsi_iser_conn_create,
955 .bind_conn = iscsi_iser_conn_bind,
956 .destroy_conn = iscsi_conn_teardown,
957 .attr_is_visible = iser_attr_is_visible,
958 .set_param = iscsi_iser_set_param,
959 .get_conn_param = iscsi_conn_get_param,
960 .get_ep_param = iscsi_iser_get_ep_param,
961 .get_session_param = iscsi_session_get_param,
962 .start_conn = iscsi_iser_conn_start,
963 .stop_conn = iscsi_iser_conn_stop,
964 /* iscsi host params */
965 .get_host_param = iscsi_host_get_param,
966 .set_host_param = iscsi_host_set_param,
967 /* IO */
968 .send_pdu = iscsi_conn_send_pdu,
969 .get_stats = iscsi_iser_conn_get_stats,
970 .init_task = iscsi_iser_task_init,
971 .xmit_task = iscsi_iser_task_xmit,
972 .cleanup_task = iscsi_iser_cleanup_task,
973 .alloc_pdu = iscsi_iser_pdu_alloc,
974 .check_protection = iscsi_iser_check_protection,
975 /* recovery */
976 .session_recovery_timedout = iscsi_session_recovery_timedout,
977
978 .ep_connect = iscsi_iser_ep_connect,
979 .ep_poll = iscsi_iser_ep_poll,
980 .ep_disconnect = iscsi_iser_ep_disconnect
981};
982
983static int __init iser_init(void)
984{
985 int err;
986
987 iser_dbg("Starting iSER datamover...\n");
988
989 if (iscsi_max_lun < 1) {
990 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
991 return -EINVAL;
992 }
993
994 memset(&ig, 0, sizeof(struct iser_global));
995
996 ig.desc_cache = kmem_cache_create("iser_descriptors",
997 sizeof(struct iser_tx_desc),
998 0, SLAB_HWCACHE_ALIGN,
999 NULL);
1000 if (ig.desc_cache == NULL)
1001 return -ENOMEM;
1002
1003 /* device init is called only after the first addr resolution */
1004 mutex_init(&ig.device_list_mutex);
1005 INIT_LIST_HEAD(&ig.device_list);
1006 mutex_init(&ig.connlist_mutex);
1007 INIT_LIST_HEAD(&ig.connlist);
1008
1009 release_wq = alloc_workqueue("release workqueue", 0, 0);
1010 if (!release_wq) {
1011 iser_err("failed to allocate release workqueue\n");
1012 return -ENOMEM;
1013 }
1014
1015 iscsi_iser_scsi_transport = iscsi_register_transport(
1016 &iscsi_iser_transport);
1017 if (!iscsi_iser_scsi_transport) {
1018 iser_err("iscsi_register_transport failed\n");
1019 err = -EINVAL;
1020 goto register_transport_failure;
1021 }
1022
1023 return 0;
1024
1025register_transport_failure:
1026 kmem_cache_destroy(ig.desc_cache);
1027
1028 return err;
1029}
1030
1031static void __exit iser_exit(void)
1032{
1033 struct iser_conn *iser_conn, *n;
1034 int connlist_empty;
1035
1036 iser_dbg("Removing iSER datamover...\n");
1037 destroy_workqueue(release_wq);
1038
1039 mutex_lock(&ig.connlist_mutex);
1040 connlist_empty = list_empty(&ig.connlist);
1041 mutex_unlock(&ig.connlist_mutex);
1042
1043 if (!connlist_empty) {
1044 iser_err("Error cleanup stage completed but we still have iser "
1045 "connections, destroying them anyway.\n");
1046 list_for_each_entry_safe(iser_conn, n, &ig.connlist,
1047 conn_list) {
1048 iser_conn_release(iser_conn);
1049 }
1050 }
1051
1052 iscsi_unregister_transport(&iscsi_iser_transport);
1053 kmem_cache_destroy(ig.desc_cache);
1054}
1055
1056module_init(iser_init);
1057module_exit(iser_exit);
Linux kernel - Deliverables
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