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Or Gerlitz65e7ae72006-05-11 10:00:44 +03001/*
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.
Or Gerlitz3ee07d22014-04-01 16:28:41 +03008 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
Or Gerlitz65e7ae72006-05-11 10:00:44 +03009 * 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
Or Gerlitz65e7ae72006-05-11 10:00:44 +030046 */
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>
Or Gerlitz65e7ae72006-05-11 10:00:44 +030055#include <linux/cdev.h>
56#include <linux/in.h>
57#include <linux/net.h>
58#include <linux/scatterlist.h>
59#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090060#include <linux/slab.h>
Paul Gortmakere4dd23d2011-05-27 15:35:46 -040061#include <linux/module.h>
Or Gerlitz65e7ae72006-05-11 10:00:44 +030062
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
Mike Christie75613522008-05-21 15:53:59 -050077static struct scsi_host_template iscsi_iser_sht;
78static struct iscsi_transport iscsi_iser_transport;
79static struct scsi_transport_template *iscsi_iser_scsi_transport;
80
Or Gerlitz65e7ae72006-05-11 10:00:44 +030081static unsigned int iscsi_max_lun = 512;
82module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
83
84int iser_debug_level = 0;
Alex Tabachnik7f733842014-03-05 19:43:46 +020085bool iser_pi_enable = false;
86int iser_pi_guard = 0;
Or Gerlitz65e7ae72006-05-11 10:00:44 +030087
Roi Dayanc1d786e2013-05-01 13:25:24 +000088MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
Or Gerlitz65e7ae72006-05-11 10:00:44 +030089MODULE_LICENSE("Dual BSD/GPL");
90MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
Roi Dayanc1d786e2013-05-01 13:25:24 +000091MODULE_VERSION(DRV_VER);
Or Gerlitz65e7ae72006-05-11 10:00:44 +030092
93module_param_named(debug_level, iser_debug_level, int, 0644);
94MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
95
Alex Tabachnik7f733842014-03-05 19:43:46 +020096module_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:CRC)");
101
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300102static struct workqueue_struct *release_wq;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300103struct iser_global ig;
104
105void
106iscsi_iser_recv(struct iscsi_conn *conn,
107 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
108{
109 int rc = 0;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300110 int datalen;
111 int ahslen;
112
113 /* verify PDU length */
114 datalen = ntoh24(hdr->dlength);
Or Gerlitz200ae1a2011-08-01 21:14:09 +0000115 if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
116 iser_err("wrong datalen %d (hdr), %d (IB)\n",
117 datalen, rx_data_len);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300118 rc = ISCSI_ERR_DATALEN;
119 goto error;
120 }
121
Or Gerlitz200ae1a2011-08-01 21:14:09 +0000122 if (datalen != rx_data_len)
123 iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
124 datalen, rx_data_len);
125
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300126 /* read AHS */
127 ahslen = hdr->hlength * 4;
128
Mike Christie0af967f2008-05-21 15:54:04 -0500129 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300130 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
131 goto error;
132
133 return;
134error:
135 iscsi_conn_failure(conn, rc);
136}
137
Mike Christie2ff79d52008-12-02 00:32:14 -0600138static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
Mike Christie0f9c7442008-12-02 00:32:06 -0600139{
140 struct iscsi_iser_task *iser_task = task->dd_data;
141
142 task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
143 task->hdr_max = sizeof(iser_task->desc.iscsi_header);
144 return 0;
145}
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300146
Or Gerlitzf19624a2010-02-08 13:19:56 +0000147int iser_initialize_task_headers(struct iscsi_task *task,
148 struct iser_tx_desc *tx_desc)
149{
Ariel Nahum4667f5d2014-04-01 16:28:39 +0300150 struct iser_conn *ib_conn = task->conn->dd_data;
151 struct iser_device *device = ib_conn->device;
Or Gerlitzf19624a2010-02-08 13:19:56 +0000152 struct iscsi_iser_task *iser_task = task->dd_data;
153 u64 dma_addr;
154
155 dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
156 ISER_HEADERS_LEN, DMA_TO_DEVICE);
157 if (ib_dma_mapping_error(device->ib_device, dma_addr))
158 return -ENOMEM;
159
160 tx_desc->dma_addr = dma_addr;
161 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
162 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
163 tx_desc->tx_sg[0].lkey = device->mr->lkey;
164
Ariel Nahum4667f5d2014-04-01 16:28:39 +0300165 iser_task->ib_conn = ib_conn;
Or Gerlitzf19624a2010-02-08 13:19:56 +0000166 return 0;
167}
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300168/**
Mike Christie2261ec32008-05-21 15:54:11 -0500169 * iscsi_iser_task_init - Initialize task
170 * @task: iscsi task
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300171 *
Mike Christie2261ec32008-05-21 15:54:11 -0500172 * Initialize the task for the scsi command or mgmt command.
Mike Christie2747fdb2008-05-21 15:54:08 -0500173 */
Olaf Kircha8ac6312007-12-13 12:43:35 -0600174static int
Mike Christie2261ec32008-05-21 15:54:11 -0500175iscsi_iser_task_init(struct iscsi_task *task)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300176{
Mike Christie2261ec32008-05-21 15:54:11 -0500177 struct iscsi_iser_task *iser_task = task->dd_data;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300178
Or Gerlitz52439542011-11-04 00:21:27 +0200179 if (iser_initialize_task_headers(task, &iser_task->desc))
Or Gerlitzf19624a2010-02-08 13:19:56 +0000180 return -ENOMEM;
181
Mike Christie2261ec32008-05-21 15:54:11 -0500182 /* mgmt task */
Or Gerlitzf19624a2010-02-08 13:19:56 +0000183 if (!task->sc)
Mike Christie2747fdb2008-05-21 15:54:08 -0500184 return 0;
Mike Christie2747fdb2008-05-21 15:54:08 -0500185
Mike Christie2261ec32008-05-21 15:54:11 -0500186 iser_task->command_sent = 0;
Mike Christie2261ec32008-05-21 15:54:11 -0500187 iser_task_rdma_init(iser_task);
Sagi Grimberg177e31bd2014-03-05 19:43:48 +0200188 iser_task->sc = task->sc;
189
Olaf Kircha8ac6312007-12-13 12:43:35 -0600190 return 0;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300191}
192
193/**
Mike Christie2261ec32008-05-21 15:54:11 -0500194 * iscsi_iser_mtask_xmit - xmit management(immediate) task
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300195 * @conn: iscsi connection
Mike Christie2261ec32008-05-21 15:54:11 -0500196 * @task: task management task
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300197 *
198 * Notes:
199 * The function can return -EAGAIN in which case caller must
200 * call it again later, or recover. '0' return code means successful
201 * xmit.
202 *
203 **/
204static int
Mike Christie2261ec32008-05-21 15:54:11 -0500205iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300206{
207 int error = 0;
208
Or Gerlitz962b4b52010-02-08 13:22:34 +0000209 iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300210
Mike Christie2261ec32008-05-21 15:54:11 -0500211 error = iser_send_control(conn, task);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300212
Mike Christie2261ec32008-05-21 15:54:11 -0500213 /* since iser xmits control with zero copy, tasks can not be recycled
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300214 * right after sending them.
215 * The recycling scheme is based on whether a response is expected
Mike Christie2261ec32008-05-21 15:54:11 -0500216 * - if yes, the task is recycled at iscsi_complete_pdu
217 * - if no, the task is recycled at iser_snd_completion
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300218 */
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300219 return error;
220}
221
222static int
Mike Christie2747fdb2008-05-21 15:54:08 -0500223iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
Mike Christie2261ec32008-05-21 15:54:11 -0500224 struct iscsi_task *task)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300225{
Mike Christie0f9c7442008-12-02 00:32:06 -0600226 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
227 struct iscsi_data hdr;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300228 int error = 0;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300229
230 /* Send data-out PDUs while there's still unsolicited data to send */
Mike Christie0f9c7442008-12-02 00:32:06 -0600231 while (iscsi_task_has_unsol_data(task)) {
232 iscsi_prep_data_out_pdu(task, r2t, &hdr);
Mike Christie48a237a2009-03-05 14:45:57 -0600233 iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
Mike Christie0f9c7442008-12-02 00:32:06 -0600234 hdr.itt, r2t->data_count);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300235
236 /* the buffer description has been passed with the command */
237 /* Send the command */
Mike Christie2261ec32008-05-21 15:54:11 -0500238 error = iser_send_data_out(conn, task, &hdr);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300239 if (error) {
Mike Christie0f9c7442008-12-02 00:32:06 -0600240 r2t->datasn--;
Mike Christie2747fdb2008-05-21 15:54:08 -0500241 goto iscsi_iser_task_xmit_unsol_data_exit;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300242 }
Mike Christie0f9c7442008-12-02 00:32:06 -0600243 r2t->sent += r2t->data_count;
Mike Christie48a237a2009-03-05 14:45:57 -0600244 iser_dbg("Need to send %d more as data-out PDUs\n",
Mike Christie0f9c7442008-12-02 00:32:06 -0600245 r2t->data_length - r2t->sent);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300246 }
247
Mike Christie2747fdb2008-05-21 15:54:08 -0500248iscsi_iser_task_xmit_unsol_data_exit:
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300249 return error;
250}
251
252static int
Mike Christie2261ec32008-05-21 15:54:11 -0500253iscsi_iser_task_xmit(struct iscsi_task *task)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300254{
Mike Christie2261ec32008-05-21 15:54:11 -0500255 struct iscsi_conn *conn = task->conn;
256 struct iscsi_iser_task *iser_task = task->dd_data;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300257 int error = 0;
258
Mike Christie2261ec32008-05-21 15:54:11 -0500259 if (!task->sc)
260 return iscsi_iser_mtask_xmit(conn, task);
Mike Christie2747fdb2008-05-21 15:54:08 -0500261
Mike Christie2261ec32008-05-21 15:54:11 -0500262 if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
263 BUG_ON(scsi_bufflen(task->sc) == 0);
Mike Christie77a23c22007-05-30 12:57:18 -0500264
Mike Christie48a237a2009-03-05 14:45:57 -0600265 iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
Mike Christie2261ec32008-05-21 15:54:11 -0500266 task->itt, scsi_bufflen(task->sc),
Mike Christie0f9c7442008-12-02 00:32:06 -0600267 task->imm_count, task->unsol_r2t.data_length);
Mike Christie77a23c22007-05-30 12:57:18 -0500268 }
269
Or Gerlitz962b4b52010-02-08 13:22:34 +0000270 iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
Mike Christie2261ec32008-05-21 15:54:11 -0500271 conn->id, task->itt);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300272
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300273 /* Send the cmd PDU */
Mike Christie2261ec32008-05-21 15:54:11 -0500274 if (!iser_task->command_sent) {
275 error = iser_send_command(conn, task);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300276 if (error)
Mike Christie2747fdb2008-05-21 15:54:08 -0500277 goto iscsi_iser_task_xmit_exit;
Mike Christie2261ec32008-05-21 15:54:11 -0500278 iser_task->command_sent = 1;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300279 }
280
281 /* Send unsolicited data-out PDU(s) if necessary */
Mike Christie0f9c7442008-12-02 00:32:06 -0600282 if (iscsi_task_has_unsol_data(task))
Mike Christie2261ec32008-05-21 15:54:11 -0500283 error = iscsi_iser_task_xmit_unsol_data(conn, task);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300284
Mike Christie2747fdb2008-05-21 15:54:08 -0500285 iscsi_iser_task_xmit_exit:
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300286 return error;
287}
288
Mike Christie0f9c7442008-12-02 00:32:06 -0600289static void iscsi_iser_cleanup_task(struct iscsi_task *task)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300290{
Mike Christie2261ec32008-05-21 15:54:11 -0500291 struct iscsi_iser_task *iser_task = task->dd_data;
Ariel Nahum4667f5d2014-04-01 16:28:39 +0300292 struct iser_tx_desc *tx_desc = &iser_task->desc;
293 struct iser_conn *ib_conn = task->conn->dd_data;
294 struct iser_device *device = ib_conn->device;
Or Gerlitz52439542011-11-04 00:21:27 +0200295
296 ib_dma_unmap_single(device->ib_device,
297 tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300298
Mike Christieb3cd5052009-05-13 17:57:49 -0500299 /* mgmt tasks do not need special cleanup */
300 if (!task->sc)
Mike Christie2747fdb2008-05-21 15:54:08 -0500301 return;
302
Mike Christie2261ec32008-05-21 15:54:11 -0500303 if (iser_task->status == ISER_TASK_STATUS_STARTED) {
304 iser_task->status = ISER_TASK_STATUS_COMPLETED;
305 iser_task_rdma_finalize(iser_task);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300306 }
307}
308
Sagi Grimberg0a7a08a2014-03-05 19:43:50 +0200309static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
310{
311 struct iscsi_iser_task *iser_task = task->dd_data;
312
313 if (iser_task->dir[ISER_DIR_IN])
314 return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
315 sector);
316 else
317 return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
318 sector);
319}
320
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300321static struct iscsi_cls_conn *
322iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
323{
324 struct iscsi_conn *conn;
325 struct iscsi_cls_conn *cls_conn;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300326
Ariel Nahum4667f5d2014-04-01 16:28:39 +0300327 cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300328 if (!cls_conn)
329 return NULL;
330 conn = cls_conn->dd_data;
331
332 /*
333 * due to issues with the login code re iser sematics
334 * this not set in iscsi_conn_setup - FIXME
335 */
Or Gerlitzbcc60c32010-02-08 13:17:42 +0000336 conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300337
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300338 return cls_conn;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300339}
340
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300341static int
342iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
343 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
344 int is_leading)
345{
346 struct iscsi_conn *conn = cls_conn->dd_data;
Shlomo Pongratzb7f04512013-07-28 12:35:38 +0300347 struct iscsi_session *session;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300348 struct iser_conn *ib_conn;
Mike Christie412eeaf2008-05-21 15:54:14 -0500349 struct iscsi_endpoint *ep;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300350 int error;
351
352 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
353 if (error)
354 return error;
355
356 /* the transport ep handle comes from user space so it must be
357 * verified against the global ib connections list */
Mike Christie412eeaf2008-05-21 15:54:14 -0500358 ep = iscsi_lookup_endpoint(transport_eph);
359 if (!ep) {
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300360 iser_err("can't bind eph %llx\n",
361 (unsigned long long)transport_eph);
362 return -EINVAL;
363 }
Mike Christie412eeaf2008-05-21 15:54:14 -0500364 ib_conn = ep->dd_data;
365
Shlomo Pongratzb7f04512013-07-28 12:35:38 +0300366 session = conn->session;
367 if (iser_alloc_rx_descriptors(ib_conn, session))
Or Gerlitz89e984e2012-03-05 18:21:44 +0200368 return -ENOMEM;
369
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300370 /* binds the iSER connection retrieved from the previously
371 * connected ep_handle to the iSCSI layer connection. exchanges
372 * connection pointers */
Ariel Nahum4667f5d2014-04-01 16:28:39 +0300373 iser_info("binding iscsi conn %p to ib_conn %p\n", conn, ib_conn);
374
375 conn->dd_data = ib_conn;
376 ib_conn->iscsi_conn = conn;
377
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300378 return 0;
379}
380
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300381static int
382iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
383{
384 struct iscsi_conn *iscsi_conn;
385 struct iser_conn *ib_conn;
386
387 iscsi_conn = cls_conn->dd_data;
388 ib_conn = iscsi_conn->dd_data;
389 reinit_completion(&ib_conn->stop_completion);
390
391 return iscsi_conn_start(cls_conn);
392}
393
Mike Christieb40977d2008-05-21 15:54:03 -0500394static void
395iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
396{
397 struct iscsi_conn *conn = cls_conn->dd_data;
Ariel Nahum4667f5d2014-04-01 16:28:39 +0300398 struct iser_conn *ib_conn = conn->dd_data;
Mike Christieb40977d2008-05-21 15:54:03 -0500399
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300400 iser_dbg("stopping iscsi_conn: %p, ib_conn: %p\n", conn, ib_conn);
401 iscsi_conn_stop(cls_conn, flag);
402
Mike Christieb40977d2008-05-21 15:54:03 -0500403 /*
Mike Christie913e5bf2008-05-21 15:54:18 -0500404 * Userspace may have goofed up and not bound the connection or
405 * might have only partially setup the connection.
Mike Christieb40977d2008-05-21 15:54:03 -0500406 */
Mike Christie913e5bf2008-05-21 15:54:18 -0500407 if (ib_conn) {
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300408 conn->dd_data = NULL;
409 complete(&ib_conn->stop_completion);
Mike Christie913e5bf2008-05-21 15:54:18 -0500410 }
Mike Christieb40977d2008-05-21 15:54:03 -0500411}
412
Mike Christie75613522008-05-21 15:53:59 -0500413static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
414{
415 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
416
Mike Christiee5bd7b52008-09-24 11:46:10 -0500417 iscsi_session_teardown(cls_session);
Mike Christiea4804cd2008-05-21 15:54:00 -0500418 iscsi_host_remove(shost);
419 iscsi_host_free(shost);
Mike Christie75613522008-05-21 15:53:59 -0500420}
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300421
Sagi Grimberg6192d4e2014-03-05 19:43:51 +0200422static inline unsigned int
423iser_dif_prot_caps(int prot_caps)
424{
425 return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
426 SHOST_DIX_TYPE1_PROTECTION : 0) |
427 ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
428 SHOST_DIX_TYPE2_PROTECTION : 0) |
429 ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
430 SHOST_DIX_TYPE3_PROTECTION : 0);
431}
432
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300433static struct iscsi_cls_session *
Mike Christie412eeaf2008-05-21 15:54:14 -0500434iscsi_iser_session_create(struct iscsi_endpoint *ep,
Mike Christie75613522008-05-21 15:53:59 -0500435 uint16_t cmds_max, uint16_t qdepth,
Mike Christie5e7facb2009-03-05 14:46:06 -0600436 uint32_t initial_cmdsn)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300437{
438 struct iscsi_cls_session *cls_session;
439 struct iscsi_session *session;
Mike Christie412eeaf2008-05-21 15:54:14 -0500440 struct Scsi_Host *shost;
Shlomo Pongratzb7f04512013-07-28 12:35:38 +0300441 struct iser_conn *ib_conn = NULL;
Mike Christie75613522008-05-21 15:53:59 -0500442
Or Gerlitz962b4b52010-02-08 13:22:34 +0000443 shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
Mike Christie75613522008-05-21 15:53:59 -0500444 if (!shost)
445 return NULL;
446 shost->transportt = iscsi_iser_scsi_transport;
Shlomo Pongratzb7f04512013-07-28 12:35:38 +0300447 shost->cmd_per_lun = qdepth;
Mike Christie75613522008-05-21 15:53:59 -0500448 shost->max_lun = iscsi_max_lun;
449 shost->max_id = 0;
450 shost->max_channel = 0;
451 shost->max_cmd_len = 16;
452
Mike Christie412eeaf2008-05-21 15:54:14 -0500453 /*
454 * older userspace tools (before 2.0-870) did not pass us
455 * the leading conn's ep so this will be NULL;
456 */
Sagi Grimberg6192d4e2014-03-05 19:43:51 +0200457 if (ep) {
Mike Christie412eeaf2008-05-21 15:54:14 -0500458 ib_conn = ep->dd_data;
Sagi Grimberg6192d4e2014-03-05 19:43:51 +0200459 if (ib_conn->pi_support) {
460 u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
461
462 scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
463 if (iser_pi_guard)
464 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
465 else
466 scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
467 }
468 }
Mike Christie412eeaf2008-05-21 15:54:14 -0500469
470 if (iscsi_host_add(shost,
471 ep ? ib_conn->device->ib_device->dma_device : NULL))
Mike Christie75613522008-05-21 15:53:59 -0500472 goto free_host;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300473
Shlomo Pongratzb7f04512013-07-28 12:35:38 +0300474 if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
475 iser_info("cmds_max changed from %u to %u\n",
476 cmds_max, ISER_DEF_XMIT_CMDS_MAX);
477 cmds_max = ISER_DEF_XMIT_CMDS_MAX;
478 }
479
Mike Christie75613522008-05-21 15:53:59 -0500480 cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
Shlomo Pongratzb7f04512013-07-28 12:35:38 +0300481 cmds_max, 0,
Mike Christie2261ec32008-05-21 15:54:11 -0500482 sizeof(struct iscsi_iser_task),
Mike Christie79706342008-05-21 15:54:12 -0500483 initial_cmdsn, 0);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300484 if (!cls_session)
Mike Christie75613522008-05-21 15:53:59 -0500485 goto remove_host;
486 session = cls_session->dd_data;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300487
Mike Christie2747fdb2008-05-21 15:54:08 -0500488 shost->can_queue = session->scsi_cmds_max;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300489 return cls_session;
Mike Christie75613522008-05-21 15:53:59 -0500490
491remove_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500492 iscsi_host_remove(shost);
Mike Christie75613522008-05-21 15:53:59 -0500493free_host:
Mike Christiea4804cd2008-05-21 15:54:00 -0500494 iscsi_host_free(shost);
Mike Christie75613522008-05-21 15:53:59 -0500495 return NULL;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300496}
497
498static int
Mike Christie358ff012006-06-28 12:00:25 -0500499iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
500 enum iscsi_param param, char *buf, int buflen)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300501{
Mike Christie358ff012006-06-28 12:00:25 -0500502 int value;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300503
504 switch (param) {
505 case ISCSI_PARAM_MAX_RECV_DLENGTH:
506 /* TBD */
507 break;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300508 case ISCSI_PARAM_HDRDGST_EN:
Mike Christie358ff012006-06-28 12:00:25 -0500509 sscanf(buf, "%d", &value);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300510 if (value) {
Roi Dayane7eeffa2014-05-22 11:00:20 +0300511 iser_err("DataDigest wasn't negotiated to None\n");
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300512 return -EPROTO;
513 }
514 break;
515 case ISCSI_PARAM_DATADGST_EN:
Mike Christie358ff012006-06-28 12:00:25 -0500516 sscanf(buf, "%d", &value);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300517 if (value) {
Roi Dayane7eeffa2014-05-22 11:00:20 +0300518 iser_err("DataDigest wasn't negotiated to None\n");
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300519 return -EPROTO;
520 }
521 break;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300522 case ISCSI_PARAM_IFMARKER_EN:
Mike Christie358ff012006-06-28 12:00:25 -0500523 sscanf(buf, "%d", &value);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300524 if (value) {
Roi Dayane7eeffa2014-05-22 11:00:20 +0300525 iser_err("IFMarker wasn't negotiated to No\n");
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300526 return -EPROTO;
527 }
528 break;
529 case ISCSI_PARAM_OFMARKER_EN:
Mike Christie358ff012006-06-28 12:00:25 -0500530 sscanf(buf, "%d", &value);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300531 if (value) {
Roi Dayane7eeffa2014-05-22 11:00:20 +0300532 iser_err("OFMarker wasn't negotiated to No\n");
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300533 return -EPROTO;
534 }
535 break;
536 default:
Mike Christie358ff012006-06-28 12:00:25 -0500537 return iscsi_set_param(cls_conn, param, buf, buflen);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300538 }
539
540 return 0;
541}
542
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300543static void
544iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
545{
546 struct iscsi_conn *conn = cls_conn->dd_data;
547
548 stats->txdata_octets = conn->txdata_octets;
549 stats->rxdata_octets = conn->rxdata_octets;
550 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
551 stats->dataout_pdus = conn->dataout_pdus_cnt;
552 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
553 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
554 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
555 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
556 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
Eli Dorfman87528222008-04-29 13:46:52 -0700557 stats->custom_length = 4;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300558 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
559 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
560 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
561 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
562 strcpy(stats->custom[2].desc, "eh_abort_cnt");
563 stats->custom[2].value = conn->eh_abort_cnt;
Eli Dorfman87528222008-04-29 13:46:52 -0700564 strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
565 stats->custom[3].value = conn->fmr_unalign_cnt;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300566}
567
Mike Christie7c53c6f2011-02-16 15:04:40 -0600568static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
569 enum iscsi_param param, char *buf)
570{
571 struct iser_conn *ib_conn = ep->dd_data;
572 int len;
573
574 switch (param) {
575 case ISCSI_PARAM_CONN_PORT:
576 case ISCSI_PARAM_CONN_ADDRESS:
577 if (!ib_conn || !ib_conn->cma_id)
578 return -ENOTCONN;
579
580 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
581 &ib_conn->cma_id->route.addr.dst_addr,
582 param, buf);
583 break;
584 default:
585 return -ENOSYS;
586 }
587
588 return len;
589}
590
Mike Christie412eeaf2008-05-21 15:54:14 -0500591static struct iscsi_endpoint *
Mike Christie10eb0f02009-05-13 17:57:38 -0500592iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
593 int non_blocking)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300594{
595 int err;
596 struct iser_conn *ib_conn;
Mike Christie412eeaf2008-05-21 15:54:14 -0500597 struct iscsi_endpoint *ep;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300598
Ariel Nahum0a690752014-07-31 13:27:47 +0300599 ep = iscsi_create_endpoint(0);
Mike Christie412eeaf2008-05-21 15:54:14 -0500600 if (!ep)
601 return ERR_PTR(-ENOMEM);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300602
Ariel Nahum0a690752014-07-31 13:27:47 +0300603 ib_conn = kzalloc(sizeof(*ib_conn), GFP_KERNEL);
604 if (!ib_conn) {
605 err = -ENOMEM;
606 goto failure;
607 }
608
609 ep->dd_data = ib_conn;
Mike Christie412eeaf2008-05-21 15:54:14 -0500610 ib_conn->ep = ep;
611 iser_conn_init(ib_conn);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300612
Roi Dayan96ed02d2014-07-31 13:27:44 +0300613 err = iser_connect(ib_conn, NULL, dst_addr, non_blocking);
Or Gerlitz7d9c0de2012-04-29 17:04:21 +0300614 if (err)
Ariel Nahum0a690752014-07-31 13:27:47 +0300615 goto failure;
Or Gerlitz7d9c0de2012-04-29 17:04:21 +0300616
Mike Christie412eeaf2008-05-21 15:54:14 -0500617 return ep;
Ariel Nahum0a690752014-07-31 13:27:47 +0300618failure:
619 iscsi_destroy_endpoint(ep);
620 return ERR_PTR(err);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300621}
622
623static int
Mike Christie412eeaf2008-05-21 15:54:14 -0500624iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300625{
Mike Christie412eeaf2008-05-21 15:54:14 -0500626 struct iser_conn *ib_conn;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300627 int rc;
628
Mike Christie412eeaf2008-05-21 15:54:14 -0500629 ib_conn = ep->dd_data;
Ariel Nahum9a6d3232014-07-31 13:27:50 +0300630 rc = wait_for_completion_interruptible_timeout(&ib_conn->up_completion,
631 msecs_to_jiffies(timeout_ms));
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300632 /* if conn establishment failed, return error code to iscsi */
Ariel Nahum504130c2014-07-31 13:27:49 +0300633 if (rc == 0) {
634 mutex_lock(&ib_conn->state_mutex);
635 if (ib_conn->state == ISER_CONN_TERMINATING ||
636 ib_conn->state == ISER_CONN_DOWN)
637 rc = -1;
638 mutex_unlock(&ib_conn->state_mutex);
639 }
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300640
Roi Dayan4f363882013-05-01 13:25:25 +0000641 iser_info("ib conn %p rc = %d\n", ib_conn, rc);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300642
643 if (rc > 0)
644 return 1; /* success, this is the equivalent of POLLOUT */
645 else if (!rc)
646 return 0; /* timeout */
647 else
648 return rc; /* signal */
649}
650
651static void
Mike Christie412eeaf2008-05-21 15:54:14 -0500652iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300653{
Mike Christie1c834692006-07-24 15:47:26 -0500654 struct iser_conn *ib_conn;
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300655
Mike Christie412eeaf2008-05-21 15:54:14 -0500656 ib_conn = ep->dd_data;
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300657 iser_info("ep %p ib conn %p state %d\n", ep, ib_conn, ib_conn->state);
Ariel Nahum504130c2014-07-31 13:27:49 +0300658 mutex_lock(&ib_conn->state_mutex);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300659 iser_conn_terminate(ib_conn);
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300660
661 /*
Ariel Nahum9a6d3232014-07-31 13:27:50 +0300662 * if iser_conn and iscsi_conn are bound, we must wait for
663 * iscsi_conn_stop and flush errors completion before freeing
664 * the iser resources. Otherwise we are safe to free resources
665 * immediately.
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300666 */
667 if (ib_conn->iscsi_conn) {
668 INIT_WORK(&ib_conn->release_work, iser_release_work);
669 queue_work(release_wq, &ib_conn->release_work);
Ariel Nahum504130c2014-07-31 13:27:49 +0300670 mutex_unlock(&ib_conn->state_mutex);
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300671 } else {
Ariel Nahum504130c2014-07-31 13:27:49 +0300672 ib_conn->state = ISER_CONN_DOWN;
673 mutex_unlock(&ib_conn->state_mutex);
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300674 iser_conn_release(ib_conn);
675 }
Ariel Nahum0a690752014-07-31 13:27:47 +0300676 iscsi_destroy_endpoint(ep);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300677}
678
Al Viro587a1f12011-07-23 23:11:19 -0400679static umode_t iser_attr_is_visible(int param_type, int param)
Mike Christie3128c6c2011-07-25 13:48:42 -0500680{
681 switch (param_type) {
Mike Christief27fb2e2011-07-25 13:48:45 -0500682 case ISCSI_HOST_PARAM:
683 switch (param) {
684 case ISCSI_HOST_PARAM_NETDEV_NAME:
685 case ISCSI_HOST_PARAM_HWADDRESS:
686 case ISCSI_HOST_PARAM_INITIATOR_NAME:
687 return S_IRUGO;
688 default:
689 return 0;
690 }
Mike Christie3128c6c2011-07-25 13:48:42 -0500691 case ISCSI_PARAM:
692 switch (param) {
693 case ISCSI_PARAM_MAX_RECV_DLENGTH:
694 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
695 case ISCSI_PARAM_HDRDGST_EN:
696 case ISCSI_PARAM_DATADGST_EN:
697 case ISCSI_PARAM_CONN_ADDRESS:
698 case ISCSI_PARAM_CONN_PORT:
699 case ISCSI_PARAM_EXP_STATSN:
700 case ISCSI_PARAM_PERSISTENT_ADDRESS:
701 case ISCSI_PARAM_PERSISTENT_PORT:
702 case ISCSI_PARAM_PING_TMO:
703 case ISCSI_PARAM_RECV_TMO:
Mike Christie1d063c12011-07-25 13:48:43 -0500704 case ISCSI_PARAM_INITIAL_R2T_EN:
705 case ISCSI_PARAM_MAX_R2T:
706 case ISCSI_PARAM_IMM_DATA_EN:
707 case ISCSI_PARAM_FIRST_BURST:
708 case ISCSI_PARAM_MAX_BURST:
709 case ISCSI_PARAM_PDU_INORDER_EN:
710 case ISCSI_PARAM_DATASEQ_INORDER_EN:
711 case ISCSI_PARAM_TARGET_NAME:
712 case ISCSI_PARAM_TPGT:
713 case ISCSI_PARAM_USERNAME:
714 case ISCSI_PARAM_PASSWORD:
715 case ISCSI_PARAM_USERNAME_IN:
716 case ISCSI_PARAM_PASSWORD_IN:
717 case ISCSI_PARAM_FAST_ABORT:
718 case ISCSI_PARAM_ABORT_TMO:
719 case ISCSI_PARAM_LU_RESET_TMO:
720 case ISCSI_PARAM_TGT_RESET_TMO:
721 case ISCSI_PARAM_IFACE_NAME:
722 case ISCSI_PARAM_INITIATOR_NAME:
Or Gerlitz6a06a4b2013-08-08 13:44:29 +0300723 case ISCSI_PARAM_DISCOVERY_SESS:
Mike Christie3128c6c2011-07-25 13:48:42 -0500724 return S_IRUGO;
725 default:
726 return 0;
727 }
728 }
729
730 return 0;
731}
732
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300733static struct scsi_host_template iscsi_iser_sht = {
Mike Christie79743922007-07-26 12:46:46 -0500734 .module = THIS_MODULE,
Roi Dayanc1d786e2013-05-01 13:25:24 +0000735 .name = "iSCSI Initiator over iSER",
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300736 .queuecommand = iscsi_queuecommand,
Erez Zilber64106272008-01-17 11:53:17 +0200737 .change_queue_depth = iscsi_change_queue_depth,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300738 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
Erez Zilber8072ec22006-09-11 12:20:54 +0300739 .max_sectors = 1024,
Mike Christiee28f3d52009-03-05 14:46:01 -0600740 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300741 .eh_abort_handler = iscsi_eh_abort,
Erez Zilber90c18f32008-01-22 12:06:25 +0200742 .eh_device_reset_handler= iscsi_eh_device_reset,
Jayamohan Kallickal309ce152010-02-20 08:02:10 +0530743 .eh_target_reset_handler = iscsi_eh_recover_target,
Mike Christie6b5d6c42009-04-21 15:32:32 -0500744 .target_alloc = iscsi_target_alloc,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300745 .use_clustering = DISABLE_CLUSTERING,
746 .proc_name = "iscsi_iser",
747 .this_id = -1,
748};
749
750static struct iscsi_transport iscsi_iser_transport = {
751 .owner = THIS_MODULE,
752 .name = "iser",
Or Gerlitz6a06a4b2013-08-08 13:44:29 +0300753 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300754 /* session management */
755 .create_session = iscsi_iser_session_create,
Mike Christie75613522008-05-21 15:53:59 -0500756 .destroy_session = iscsi_iser_session_destroy,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300757 /* connection management */
758 .create_conn = iscsi_iser_conn_create,
759 .bind_conn = iscsi_iser_conn_bind,
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300760 .destroy_conn = iscsi_conn_teardown,
Mike Christie3128c6c2011-07-25 13:48:42 -0500761 .attr_is_visible = iser_attr_is_visible,
Mike Christie358ff012006-06-28 12:00:25 -0500762 .set_param = iscsi_iser_set_param,
763 .get_conn_param = iscsi_conn_get_param,
Mike Christie7c53c6f2011-02-16 15:04:40 -0600764 .get_ep_param = iscsi_iser_get_ep_param,
Mike Christie358ff012006-06-28 12:00:25 -0500765 .get_session_param = iscsi_session_get_param,
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300766 .start_conn = iscsi_iser_conn_start,
Mike Christieb40977d2008-05-21 15:54:03 -0500767 .stop_conn = iscsi_iser_conn_stop,
Mike Christie0801c242007-05-30 12:57:12 -0500768 /* iscsi host params */
769 .get_host_param = iscsi_host_get_param,
770 .set_host_param = iscsi_host_set_param,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300771 /* IO */
772 .send_pdu = iscsi_conn_send_pdu,
773 .get_stats = iscsi_iser_conn_get_stats,
Mike Christie2747fdb2008-05-21 15:54:08 -0500774 .init_task = iscsi_iser_task_init,
775 .xmit_task = iscsi_iser_task_xmit,
776 .cleanup_task = iscsi_iser_cleanup_task,
Mike Christie0f9c7442008-12-02 00:32:06 -0600777 .alloc_pdu = iscsi_iser_pdu_alloc,
Sagi Grimberg0a7a08a2014-03-05 19:43:50 +0200778 .check_protection = iscsi_iser_check_protection,
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300779 /* recovery */
780 .session_recovery_timedout = iscsi_session_recovery_timedout,
781
782 .ep_connect = iscsi_iser_ep_connect,
783 .ep_poll = iscsi_iser_ep_poll,
784 .ep_disconnect = iscsi_iser_ep_disconnect
785};
786
787static int __init iser_init(void)
788{
789 int err;
790
791 iser_dbg("Starting iSER datamover...\n");
792
793 if (iscsi_max_lun < 1) {
Roi Dayan4f363882013-05-01 13:25:25 +0000794 iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300795 return -EINVAL;
796 }
797
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300798 memset(&ig, 0, sizeof(struct iser_global));
799
800 ig.desc_cache = kmem_cache_create("iser_descriptors",
Or Gerlitzf19624a2010-02-08 13:19:56 +0000801 sizeof(struct iser_tx_desc),
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300802 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +0900803 NULL);
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300804 if (ig.desc_cache == NULL)
805 return -ENOMEM;
806
807 /* device init is called only after the first addr resolution */
808 mutex_init(&ig.device_list_mutex);
809 INIT_LIST_HEAD(&ig.device_list);
810 mutex_init(&ig.connlist_mutex);
811 INIT_LIST_HEAD(&ig.connlist);
812
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300813 release_wq = alloc_workqueue("release workqueue", 0, 0);
814 if (!release_wq) {
815 iser_err("failed to allocate release workqueue\n");
816 return -ENOMEM;
817 }
818
Mike Christie75613522008-05-21 15:53:59 -0500819 iscsi_iser_scsi_transport = iscsi_register_transport(
820 &iscsi_iser_transport);
821 if (!iscsi_iser_scsi_transport) {
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300822 iser_err("iscsi_register_transport failed\n");
823 err = -EINVAL;
824 goto register_transport_failure;
825 }
826
827 return 0;
828
829register_transport_failure:
830 kmem_cache_destroy(ig.desc_cache);
831
832 return err;
833}
834
835static void __exit iser_exit(void)
836{
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300837 struct iser_conn *ib_conn, *n;
838 int connlist_empty;
839
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300840 iser_dbg("Removing iSER datamover...\n");
Ariel Nahumb73c3ad2014-05-22 11:00:18 +0300841 destroy_workqueue(release_wq);
842
843 mutex_lock(&ig.connlist_mutex);
844 connlist_empty = list_empty(&ig.connlist);
845 mutex_unlock(&ig.connlist_mutex);
846
847 if (!connlist_empty) {
848 iser_err("Error cleanup stage completed but we still have iser "
849 "connections, destroying them anyway.\n");
850 list_for_each_entry_safe(ib_conn, n, &ig.connlist, conn_list) {
851 iser_conn_release(ib_conn);
852 }
853 }
854
Or Gerlitz65e7ae72006-05-11 10:00:44 +0300855 iscsi_unregister_transport(&iscsi_iser_transport);
856 kmem_cache_destroy(ig.desc_cache);
857}
858
859module_init(iser_init);
860module_exit(iser_exit);