Commit | Line | Data |
---|---|---|
65e7ae7b OG |
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. | |
3ee07d27 | 8 | * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
65e7ae7b OG |
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 | |
65e7ae7b OG |
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> | |
65e7ae7b OG |
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> | |
5a0e3ad6 | 60 | #include <linux/slab.h> |
e4dd23d7 | 61 | #include <linux/module.h> |
65e7ae7b OG |
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 | ||
75613521 MC |
77 | static struct scsi_host_template iscsi_iser_sht; |
78 | static struct iscsi_transport iscsi_iser_transport; | |
79 | static struct scsi_transport_template *iscsi_iser_scsi_transport; | |
80 | ||
65e7ae7b OG |
81 | static unsigned int iscsi_max_lun = 512; |
82 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
83 | ||
84 | int iser_debug_level = 0; | |
7f733847 | 85 | bool iser_pi_enable = false; |
f043032e | 86 | int iser_pi_guard = 1; |
65e7ae7b | 87 | |
c1d786e6 | 88 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); |
65e7ae7b OG |
89 | MODULE_LICENSE("Dual BSD/GPL"); |
90 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); | |
c1d786e6 | 91 | MODULE_VERSION(DRV_VER); |
65e7ae7b OG |
92 | |
93 | module_param_named(debug_level, iser_debug_level, int, 0644); | |
94 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); | |
95 | ||
7f733847 AT |
96 | module_param_named(pi_enable, iser_pi_enable, bool, 0644); |
97 | MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); | |
98 | ||
99 | module_param_named(pi_guard, iser_pi_guard, int, 0644); | |
f043032e | 100 | MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:IP_CSUM)"); |
7f733847 | 101 | |
b73c3ada | 102 | static struct workqueue_struct *release_wq; |
65e7ae7b OG |
103 | struct iser_global ig; |
104 | ||
dc05ac36 SG |
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 | */ | |
65e7ae7b | 115 | void |
dc05ac36 SG |
116 | iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
117 | char *rx_data, int rx_data_len) | |
65e7ae7b OG |
118 | { |
119 | int rc = 0; | |
65e7ae7b OG |
120 | int datalen; |
121 | int ahslen; | |
122 | ||
123 | /* verify PDU length */ | |
124 | datalen = ntoh24(hdr->dlength); | |
200ae1a0 OG |
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); | |
65e7ae7b OG |
128 | rc = ISCSI_ERR_DATALEN; |
129 | goto error; | |
130 | } | |
131 | ||
200ae1a0 OG |
132 | if (datalen != rx_data_len) |
133 | iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", | |
134 | datalen, rx_data_len); | |
135 | ||
65e7ae7b OG |
136 | /* read AHS */ |
137 | ahslen = hdr->hlength * 4; | |
138 | ||
0af967f5 | 139 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
140 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
141 | goto error; | |
142 | ||
143 | return; | |
144 | error: | |
145 | iscsi_conn_failure(conn, rc); | |
146 | } | |
147 | ||
dc05ac36 SG |
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 | */ | |
156 | static int | |
157 | iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) | |
0f9c7449 MC |
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); | |
dc05ac36 | 163 | |
0f9c7449 MC |
164 | return 0; |
165 | } | |
65e7ae7b | 166 | |
f19624aa OG |
167 | int iser_initialize_task_headers(struct iscsi_task *task, |
168 | struct iser_tx_desc *tx_desc) | |
169 | { | |
5716af6e | 170 | struct iser_conn *iser_conn = task->conn->dd_data; |
a4ee3539 | 171 | struct iser_device *device = iser_conn->ib_conn.device; |
f19624aa OG |
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 | ||
5716af6e | 185 | iser_task->iser_conn = iser_conn; |
f19624aa OG |
186 | return 0; |
187 | } | |
dc05ac36 | 188 | |
65e7ae7b | 189 | /** |
dc05ac36 | 190 | * iscsi_iser_task_init() - Initialize iscsi-iser task |
2261ec3d | 191 | * @task: iscsi task |
65e7ae7b | 192 | * |
2261ec3d | 193 | * Initialize the task for the scsi command or mgmt command. |
dc05ac36 SG |
194 | * |
195 | * Return: Returns zero on success or -ENOMEM when failing | |
196 | * to init task headers (dma mapping error). | |
2747fdb2 | 197 | */ |
a8ac6311 | 198 | static int |
2261ec3d | 199 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 200 | { |
2261ec3d | 201 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 202 | |
52439540 | 203 | if (iser_initialize_task_headers(task, &iser_task->desc)) |
f19624aa OG |
204 | return -ENOMEM; |
205 | ||
2261ec3d | 206 | /* mgmt task */ |
f19624aa | 207 | if (!task->sc) |
2747fdb2 | 208 | return 0; |
65e7ae7b | 209 | |
2261ec3d | 210 | iser_task->command_sent = 0; |
2261ec3d | 211 | iser_task_rdma_init(iser_task); |
177e31bd SG |
212 | iser_task->sc = task->sc; |
213 | ||
a8ac6311 | 214 | return 0; |
65e7ae7b OG |
215 | } |
216 | ||
217 | /** | |
dc05ac36 | 218 | * iscsi_iser_mtask_xmit() - xmit management (immediate) task |
65e7ae7b | 219 | * @conn: iscsi connection |
2261ec3d | 220 | * @task: task management task |
65e7ae7b OG |
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 | **/ | |
228 | static int | |
2261ec3d | 229 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
230 | { |
231 | int error = 0; | |
232 | ||
962b4b52 | 233 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 234 | |
2261ec3d | 235 | error = iser_send_control(conn, task); |
65e7ae7b | 236 | |
2261ec3d | 237 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
238 | * right after sending them. |
239 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
240 | * - if yes, the task is recycled at iscsi_complete_pdu |
241 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 242 | */ |
65e7ae7b OG |
243 | return error; |
244 | } | |
245 | ||
246 | static int | |
2747fdb2 | 247 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 248 | struct iscsi_task *task) |
65e7ae7b | 249 | { |
0f9c7449 MC |
250 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
251 | struct iscsi_data hdr; | |
65e7ae7b | 252 | int error = 0; |
65e7ae7b OG |
253 | |
254 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
255 | while (iscsi_task_has_unsol_data(task)) { |
256 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 257 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 258 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
259 | |
260 | /* the buffer description has been passed with the command */ | |
261 | /* Send the command */ | |
2261ec3d | 262 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 263 | if (error) { |
0f9c7449 | 264 | r2t->datasn--; |
2747fdb2 | 265 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 266 | } |
0f9c7449 | 267 | r2t->sent += r2t->data_count; |
48a237a2 | 268 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 269 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
270 | } |
271 | ||
2747fdb2 | 272 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
273 | return error; |
274 | } | |
275 | ||
dc05ac36 SG |
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 | */ | |
65e7ae7b | 282 | static int |
2261ec3d | 283 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 284 | { |
2261ec3d MC |
285 | struct iscsi_conn *conn = task->conn; |
286 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
287 | int error = 0; |
288 | ||
2261ec3d MC |
289 | if (!task->sc) |
290 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 291 | |
2261ec3d MC |
292 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
293 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 294 | |
48a237a2 | 295 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 296 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 297 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
298 | } |
299 | ||
962b4b52 | 300 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 301 | conn->id, task->itt); |
65e7ae7b | 302 | |
65e7ae7b | 303 | /* Send the cmd PDU */ |
2261ec3d MC |
304 | if (!iser_task->command_sent) { |
305 | error = iser_send_command(conn, task); | |
65e7ae7b | 306 | if (error) |
2747fdb2 | 307 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 308 | iser_task->command_sent = 1; |
65e7ae7b OG |
309 | } |
310 | ||
311 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 312 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 313 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 314 | |
2747fdb2 | 315 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
316 | return error; |
317 | } | |
318 | ||
dc05ac36 SG |
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 | */ | |
0f9c7449 | 327 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 328 | { |
2261ec3d | 329 | struct iscsi_iser_task *iser_task = task->dd_data; |
4667f5df | 330 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
5716af6e | 331 | struct iser_conn *iser_conn = task->conn->dd_data; |
a4ee3539 | 332 | struct iser_device *device = iser_conn->ib_conn.device; |
52439540 | 333 | |
3a940daf SG |
334 | /* DEVICE_REMOVAL event might have already released the device */ |
335 | if (!device) | |
336 | return; | |
337 | ||
52439540 OG |
338 | ib_dma_unmap_single(device->ib_device, |
339 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
65e7ae7b | 340 | |
b3cd5050 MC |
341 | /* mgmt tasks do not need special cleanup */ |
342 | if (!task->sc) | |
2747fdb2 | 343 | return; |
65e7ae7b | 344 | |
2261ec3d MC |
345 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
346 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
347 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 348 | } |
65e7ae7b OG |
349 | } |
350 | ||
dc05ac36 SG |
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 | */ | |
363 | static u8 | |
364 | iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) | |
0a7a08ad SG |
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 | ||
dc05ac36 SG |
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 | */ | |
65e7ae7b | 384 | static struct iscsi_cls_conn * |
dc05ac36 SG |
385 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, |
386 | uint32_t conn_idx) | |
65e7ae7b OG |
387 | { |
388 | struct iscsi_conn *conn; | |
389 | struct iscsi_cls_conn *cls_conn; | |
65e7ae7b | 390 | |
4667f5df | 391 | cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); |
65e7ae7b OG |
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 | */ | |
bcc60c38 | 400 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 401 | |
65e7ae7b | 402 | return cls_conn; |
65e7ae7b OG |
403 | } |
404 | ||
dc05ac36 SG |
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 | */ | |
65e7ae7b OG |
416 | static int |
417 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
dc05ac36 SG |
418 | struct iscsi_cls_conn *cls_conn, |
419 | uint64_t transport_eph, | |
65e7ae7b OG |
420 | int is_leading) |
421 | { | |
422 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 423 | struct iser_conn *iser_conn; |
412eeafa | 424 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
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 */ | |
412eeafa MC |
433 | ep = iscsi_lookup_endpoint(transport_eph); |
434 | if (!ep) { | |
65e7ae7b OG |
435 | iser_err("can't bind eph %llx\n", |
436 | (unsigned long long)transport_eph); | |
437 | return -EINVAL; | |
438 | } | |
5716af6e | 439 | iser_conn = ep->dd_data; |
412eeafa | 440 | |
5716af6e SG |
441 | mutex_lock(&iser_conn->state_mutex); |
442 | if (iser_conn->state != ISER_CONN_UP) { | |
91eb1df3 SG |
443 | error = -EINVAL; |
444 | iser_err("iser_conn %p state is %d, teardown started\n", | |
5716af6e | 445 | iser_conn, iser_conn->state); |
91eb1df3 SG |
446 | goto out; |
447 | } | |
448 | ||
5716af6e | 449 | error = iser_alloc_rx_descriptors(iser_conn, conn->session); |
91eb1df3 SG |
450 | if (error) |
451 | goto out; | |
89e984e2 | 452 | |
65e7ae7b OG |
453 | /* binds the iSER connection retrieved from the previously |
454 | * connected ep_handle to the iSCSI layer connection. exchanges | |
455 | * connection pointers */ | |
5716af6e | 456 | iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); |
4667f5df | 457 | |
5716af6e SG |
458 | conn->dd_data = iser_conn; |
459 | iser_conn->iscsi_conn = conn; | |
4667f5df | 460 | |
91eb1df3 | 461 | out: |
5716af6e | 462 | mutex_unlock(&iser_conn->state_mutex); |
91eb1df3 | 463 | return error; |
65e7ae7b | 464 | } |
65e7ae7b | 465 | |
dc05ac36 SG |
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 | */ | |
b73c3ada AN |
474 | static int |
475 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
476 | { | |
477 | struct iscsi_conn *iscsi_conn; | |
5716af6e | 478 | struct iser_conn *iser_conn; |
b73c3ada AN |
479 | |
480 | iscsi_conn = cls_conn->dd_data; | |
5716af6e SG |
481 | iser_conn = iscsi_conn->dd_data; |
482 | reinit_completion(&iser_conn->stop_completion); | |
b73c3ada AN |
483 | |
484 | return iscsi_conn_start(cls_conn); | |
485 | } | |
486 | ||
dc05ac36 SG |
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 | */ | |
b40977d9 MC |
497 | static void |
498 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
499 | { | |
500 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 501 | struct iser_conn *iser_conn = conn->dd_data; |
65e7ae7b | 502 | |
bba0a3c9 | 503 | iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); |
b73c3ada | 504 | |
b40977d9 | 505 | /* |
913e5bf4 MC |
506 | * Userspace may have goofed up and not bound the connection or |
507 | * might have only partially setup the connection. | |
b40977d9 | 508 | */ |
5716af6e | 509 | if (iser_conn) { |
ec370e2b | 510 | mutex_lock(&iser_conn->state_mutex); |
3a940daf | 511 | iscsi_conn_stop(cls_conn, flag); |
ec370e2b AN |
512 | iser_conn_terminate(iser_conn); |
513 | ||
514 | /* unbind */ | |
515 | iser_conn->iscsi_conn = NULL; | |
b73c3ada | 516 | conn->dd_data = NULL; |
ec370e2b | 517 | |
5716af6e | 518 | complete(&iser_conn->stop_completion); |
ec370e2b | 519 | mutex_unlock(&iser_conn->state_mutex); |
3a940daf SG |
520 | } else { |
521 | iscsi_conn_stop(cls_conn, flag); | |
913e5bf4 | 522 | } |
65e7ae7b OG |
523 | } |
524 | ||
dc05ac36 SG |
525 | /** |
526 | * iscsi_iser_session_destroy() - destroy iscsi-iser session | |
527 | * @cls_session: iscsi class session | |
528 | * | |
529 | * Removes and free iscsi host. | |
530 | */ | |
531 | static void | |
532 | iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) | |
75613521 MC |
533 | { |
534 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
535 | ||
e5bd7b54 | 536 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
537 | iscsi_host_remove(shost); |
538 | iscsi_host_free(shost); | |
75613521 | 539 | } |
65e7ae7b | 540 | |
6192d4e6 SG |
541 | static inline unsigned int |
542 | iser_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 | ||
dc05ac36 SG |
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 | */ | |
65e7ae7b | 562 | static struct iscsi_cls_session * |
412eeafa | 563 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 564 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 565 | uint32_t initial_cmdsn) |
65e7ae7b OG |
566 | { |
567 | struct iscsi_cls_session *cls_session; | |
568 | struct iscsi_session *session; | |
412eeafa | 569 | struct Scsi_Host *shost; |
5716af6e | 570 | struct iser_conn *iser_conn = NULL; |
a4ee3539 | 571 | struct ib_conn *ib_conn; |
75613521 | 572 | |
962b4b52 | 573 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
574 | if (!shost) |
575 | return NULL; | |
576 | shost->transportt = iscsi_iser_scsi_transport; | |
b7f04513 | 577 | shost->cmd_per_lun = qdepth; |
75613521 MC |
578 | shost->max_lun = iscsi_max_lun; |
579 | shost->max_id = 0; | |
580 | shost->max_channel = 0; | |
581 | shost->max_cmd_len = 16; | |
582 | ||
412eeafa MC |
583 | /* |
584 | * older userspace tools (before 2.0-870) did not pass us | |
585 | * the leading conn's ep so this will be NULL; | |
586 | */ | |
6192d4e6 | 587 | if (ep) { |
5716af6e | 588 | iser_conn = ep->dd_data; |
a4ee3539 SG |
589 | ib_conn = &iser_conn->ib_conn; |
590 | if (ib_conn->pi_support) { | |
591 | u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; | |
6192d4e6 SG |
592 | |
593 | scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); | |
594 | if (iser_pi_guard) | |
595 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); | |
596 | else | |
597 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
598 | } | |
599 | } | |
412eeafa | 600 | |
5716af6e | 601 | if (iscsi_host_add(shost, ep ? |
a4ee3539 | 602 | ib_conn->device->ib_device->dma_device : NULL)) |
75613521 | 603 | goto free_host; |
65e7ae7b | 604 | |
b7f04513 SP |
605 | if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { |
606 | iser_info("cmds_max changed from %u to %u\n", | |
607 | cmds_max, ISER_DEF_XMIT_CMDS_MAX); | |
608 | cmds_max = ISER_DEF_XMIT_CMDS_MAX; | |
609 | } | |
610 | ||
75613521 | 611 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b7f04513 | 612 | cmds_max, 0, |
2261ec3d | 613 | sizeof(struct iscsi_iser_task), |
7970634b | 614 | initial_cmdsn, 0); |
65e7ae7b | 615 | if (!cls_session) |
75613521 MC |
616 | goto remove_host; |
617 | session = cls_session->dd_data; | |
65e7ae7b | 618 | |
2747fdb2 | 619 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 620 | return cls_session; |
75613521 MC |
621 | |
622 | remove_host: | |
a4804cd6 | 623 | iscsi_host_remove(shost); |
75613521 | 624 | free_host: |
a4804cd6 | 625 | iscsi_host_free(shost); |
75613521 | 626 | return NULL; |
65e7ae7b OG |
627 | } |
628 | ||
629 | static int | |
358ff019 MC |
630 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
631 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 632 | { |
358ff019 | 633 | int value; |
65e7ae7b OG |
634 | |
635 | switch (param) { | |
636 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
637 | /* TBD */ | |
638 | break; | |
65e7ae7b | 639 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 640 | sscanf(buf, "%d", &value); |
65e7ae7b | 641 | if (value) { |
e7eeffa4 | 642 | iser_err("DataDigest wasn't negotiated to None\n"); |
65e7ae7b OG |
643 | return -EPROTO; |
644 | } | |
645 | break; | |
646 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 647 | sscanf(buf, "%d", &value); |
65e7ae7b | 648 | if (value) { |
e7eeffa4 | 649 | iser_err("DataDigest wasn't negotiated to None\n"); |
65e7ae7b OG |
650 | return -EPROTO; |
651 | } | |
652 | break; | |
65e7ae7b | 653 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 654 | sscanf(buf, "%d", &value); |
65e7ae7b | 655 | if (value) { |
e7eeffa4 | 656 | iser_err("IFMarker wasn't negotiated to No\n"); |
65e7ae7b OG |
657 | return -EPROTO; |
658 | } | |
659 | break; | |
660 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 661 | sscanf(buf, "%d", &value); |
65e7ae7b | 662 | if (value) { |
e7eeffa4 | 663 | iser_err("OFMarker wasn't negotiated to No\n"); |
65e7ae7b OG |
664 | return -EPROTO; |
665 | } | |
666 | break; | |
667 | default: | |
358ff019 | 668 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
669 | } |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
dc05ac36 SG |
674 | /** |
675 | * iscsi_iser_set_param() - set class connection parameter | |
676 | * @cls_conn: iscsi class connection | |
677 | * @stats: iscsi stats to output | |
678 | * | |
679 | * Output connection statistics. | |
680 | */ | |
65e7ae7b OG |
681 | static void |
682 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
683 | { | |
684 | struct iscsi_conn *conn = cls_conn->dd_data; | |
685 | ||
686 | stats->txdata_octets = conn->txdata_octets; | |
687 | stats->rxdata_octets = conn->rxdata_octets; | |
688 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
689 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
690 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
691 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
692 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
693 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
694 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 695 | stats->custom_length = 4; |
65e7ae7b OG |
696 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
697 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
698 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
699 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
700 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
701 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
702 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
703 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
704 | } |
705 | ||
7c53c6f8 MC |
706 | static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
707 | enum iscsi_param param, char *buf) | |
708 | { | |
5716af6e | 709 | struct iser_conn *iser_conn = ep->dd_data; |
7c53c6f8 MC |
710 | int len; |
711 | ||
712 | switch (param) { | |
713 | case ISCSI_PARAM_CONN_PORT: | |
714 | case ISCSI_PARAM_CONN_ADDRESS: | |
a4ee3539 | 715 | if (!iser_conn || !iser_conn->ib_conn.cma_id) |
7c53c6f8 MC |
716 | return -ENOTCONN; |
717 | ||
718 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
a4ee3539 SG |
719 | &iser_conn->ib_conn.cma_id->route.addr.dst_addr, |
720 | param, buf); | |
7c53c6f8 MC |
721 | break; |
722 | default: | |
723 | return -ENOSYS; | |
724 | } | |
725 | ||
726 | return len; | |
727 | } | |
728 | ||
dc05ac36 SG |
729 | /** |
730 | * iscsi_iser_ep_connect() - Initiate iSER connection establishment | |
731 | * @shost: scsi_host | |
732 | * @dst_addr: destination address | |
733 | * @non-blocking: indicate if routine can block | |
734 | * | |
735 | * Allocate an iscsi endpoint, an iser_conn structure and bind them. | |
736 | * After that start RDMA connection establishment via rdma_cm. We | |
737 | * don't allocate iser_conn embedded in iscsi_endpoint since in teardown | |
738 | * the endpoint will be destroyed at ep_disconnect while iser_conn will | |
739 | * cleanup its resources asynchronuously. | |
740 | * | |
741 | * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) | |
742 | * if fails. | |
743 | */ | |
412eeafa | 744 | static struct iscsi_endpoint * |
10eb0f01 MC |
745 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
746 | int non_blocking) | |
65e7ae7b OG |
747 | { |
748 | int err; | |
5716af6e | 749 | struct iser_conn *iser_conn; |
412eeafa | 750 | struct iscsi_endpoint *ep; |
65e7ae7b | 751 | |
0a690758 | 752 | ep = iscsi_create_endpoint(0); |
412eeafa MC |
753 | if (!ep) |
754 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 755 | |
5716af6e SG |
756 | iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
757 | if (!iser_conn) { | |
0a690758 AN |
758 | err = -ENOMEM; |
759 | goto failure; | |
760 | } | |
761 | ||
5716af6e SG |
762 | ep->dd_data = iser_conn; |
763 | iser_conn->ep = ep; | |
764 | iser_conn_init(iser_conn); | |
65e7ae7b | 765 | |
5716af6e | 766 | err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); |
7d9c0de4 | 767 | if (err) |
0a690758 | 768 | goto failure; |
7d9c0de4 | 769 | |
412eeafa | 770 | return ep; |
0a690758 AN |
771 | failure: |
772 | iscsi_destroy_endpoint(ep); | |
773 | return ERR_PTR(err); | |
65e7ae7b OG |
774 | } |
775 | ||
dc05ac36 SG |
776 | /** |
777 | * iscsi_iser_ep_poll() - poll for iser connection establishment to complete | |
778 | * @ep: iscsi endpoint (created at ep_connect) | |
779 | * @timeout_ms: polling timeout allowed in ms. | |
780 | * | |
781 | * This routine boils down to waiting for up_completion signaling | |
782 | * that cma_id got CONNECTED event. | |
783 | * | |
784 | * Return: 1 if succeeded in connection establishment, 0 if timeout expired | |
785 | * (libiscsi will retry will kick in) or -1 if interrupted by signal | |
786 | * or more likely iser connection state transitioned to TEMINATING or | |
787 | * DOWN during the wait period. | |
788 | */ | |
65e7ae7b | 789 | static int |
412eeafa | 790 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 791 | { |
5716af6e | 792 | struct iser_conn *iser_conn; |
65e7ae7b OG |
793 | int rc; |
794 | ||
5716af6e SG |
795 | iser_conn = ep->dd_data; |
796 | rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, | |
9a6d3234 | 797 | msecs_to_jiffies(timeout_ms)); |
65e7ae7b | 798 | /* if conn establishment failed, return error code to iscsi */ |
504130c0 | 799 | if (rc == 0) { |
5716af6e SG |
800 | mutex_lock(&iser_conn->state_mutex); |
801 | if (iser_conn->state == ISER_CONN_TERMINATING || | |
802 | iser_conn->state == ISER_CONN_DOWN) | |
504130c0 | 803 | rc = -1; |
5716af6e | 804 | mutex_unlock(&iser_conn->state_mutex); |
504130c0 | 805 | } |
65e7ae7b | 806 | |
5716af6e | 807 | iser_info("ib conn %p rc = %d\n", iser_conn, rc); |
65e7ae7b OG |
808 | |
809 | if (rc > 0) | |
810 | return 1; /* success, this is the equivalent of POLLOUT */ | |
811 | else if (!rc) | |
812 | return 0; /* timeout */ | |
813 | else | |
814 | return rc; /* signal */ | |
815 | } | |
816 | ||
dc05ac36 SG |
817 | /** |
818 | * iscsi_iser_ep_disconnect() - Initiate connection teardown process | |
819 | * @ep: iscsi endpoint handle | |
820 | * | |
821 | * This routine is not blocked by iser and RDMA termination process | |
822 | * completion as we queue a deffered work for iser/RDMA destruction | |
823 | * and cleanup or actually call it immediately in case we didn't pass | |
824 | * iscsi conn bind/start stage, thus it is safe. | |
825 | */ | |
65e7ae7b | 826 | static void |
412eeafa | 827 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 828 | { |
5716af6e | 829 | struct iser_conn *iser_conn; |
65e7ae7b | 830 | |
5716af6e SG |
831 | iser_conn = ep->dd_data; |
832 | iser_info("ep %p iser conn %p state %d\n", | |
833 | ep, iser_conn, iser_conn->state); | |
834 | ||
835 | mutex_lock(&iser_conn->state_mutex); | |
836 | iser_conn_terminate(iser_conn); | |
b73c3ada AN |
837 | |
838 | /* | |
9a6d3234 AN |
839 | * if iser_conn and iscsi_conn are bound, we must wait for |
840 | * iscsi_conn_stop and flush errors completion before freeing | |
841 | * the iser resources. Otherwise we are safe to free resources | |
842 | * immediately. | |
b73c3ada | 843 | */ |
5716af6e SG |
844 | if (iser_conn->iscsi_conn) { |
845 | INIT_WORK(&iser_conn->release_work, iser_release_work); | |
846 | queue_work(release_wq, &iser_conn->release_work); | |
847 | mutex_unlock(&iser_conn->state_mutex); | |
b73c3ada | 848 | } else { |
5716af6e SG |
849 | iser_conn->state = ISER_CONN_DOWN; |
850 | mutex_unlock(&iser_conn->state_mutex); | |
851 | iser_conn_release(iser_conn); | |
b73c3ada | 852 | } |
0a690758 | 853 | iscsi_destroy_endpoint(ep); |
65e7ae7b OG |
854 | } |
855 | ||
587a1f16 | 856 | static umode_t iser_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
857 | { |
858 | switch (param_type) { | |
f27fb2ef MC |
859 | case ISCSI_HOST_PARAM: |
860 | switch (param) { | |
861 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
862 | case ISCSI_HOST_PARAM_HWADDRESS: | |
863 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
864 | return S_IRUGO; | |
865 | default: | |
866 | return 0; | |
867 | } | |
3128c6c7 MC |
868 | case ISCSI_PARAM: |
869 | switch (param) { | |
870 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
871 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
872 | case ISCSI_PARAM_HDRDGST_EN: | |
873 | case ISCSI_PARAM_DATADGST_EN: | |
874 | case ISCSI_PARAM_CONN_ADDRESS: | |
875 | case ISCSI_PARAM_CONN_PORT: | |
876 | case ISCSI_PARAM_EXP_STATSN: | |
877 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
878 | case ISCSI_PARAM_PERSISTENT_PORT: | |
879 | case ISCSI_PARAM_PING_TMO: | |
880 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
881 | case ISCSI_PARAM_INITIAL_R2T_EN: |
882 | case ISCSI_PARAM_MAX_R2T: | |
883 | case ISCSI_PARAM_IMM_DATA_EN: | |
884 | case ISCSI_PARAM_FIRST_BURST: | |
885 | case ISCSI_PARAM_MAX_BURST: | |
886 | case ISCSI_PARAM_PDU_INORDER_EN: | |
887 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
888 | case ISCSI_PARAM_TARGET_NAME: | |
889 | case ISCSI_PARAM_TPGT: | |
890 | case ISCSI_PARAM_USERNAME: | |
891 | case ISCSI_PARAM_PASSWORD: | |
892 | case ISCSI_PARAM_USERNAME_IN: | |
893 | case ISCSI_PARAM_PASSWORD_IN: | |
894 | case ISCSI_PARAM_FAST_ABORT: | |
895 | case ISCSI_PARAM_ABORT_TMO: | |
896 | case ISCSI_PARAM_LU_RESET_TMO: | |
897 | case ISCSI_PARAM_TGT_RESET_TMO: | |
898 | case ISCSI_PARAM_IFACE_NAME: | |
899 | case ISCSI_PARAM_INITIATOR_NAME: | |
6a06a4b8 | 900 | case ISCSI_PARAM_DISCOVERY_SESS: |
3128c6c7 MC |
901 | return S_IRUGO; |
902 | default: | |
903 | return 0; | |
904 | } | |
905 | } | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
65e7ae7b | 910 | static struct scsi_host_template iscsi_iser_sht = { |
7974392c | 911 | .module = THIS_MODULE, |
c1d786e6 | 912 | .name = "iSCSI Initiator over iSER", |
65e7ae7b | 913 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 914 | .change_queue_depth = scsi_change_queue_depth, |
65e7ae7b | 915 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 916 | .max_sectors = 1024, |
e28f3d5b | 917 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 918 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 919 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 920 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 921 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
922 | .use_clustering = DISABLE_CLUSTERING, |
923 | .proc_name = "iscsi_iser", | |
924 | .this_id = -1, | |
c40ecc12 | 925 | .track_queue_depth = 1, |
65e7ae7b OG |
926 | }; |
927 | ||
928 | static struct iscsi_transport iscsi_iser_transport = { | |
929 | .owner = THIS_MODULE, | |
930 | .name = "iser", | |
6a06a4b8 | 931 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, |
65e7ae7b OG |
932 | /* session management */ |
933 | .create_session = iscsi_iser_session_create, | |
75613521 | 934 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
935 | /* connection management */ |
936 | .create_conn = iscsi_iser_conn_create, | |
937 | .bind_conn = iscsi_iser_conn_bind, | |
b73c3ada | 938 | .destroy_conn = iscsi_conn_teardown, |
3128c6c7 | 939 | .attr_is_visible = iser_attr_is_visible, |
358ff019 MC |
940 | .set_param = iscsi_iser_set_param, |
941 | .get_conn_param = iscsi_conn_get_param, | |
7c53c6f8 | 942 | .get_ep_param = iscsi_iser_get_ep_param, |
358ff019 | 943 | .get_session_param = iscsi_session_get_param, |
b73c3ada | 944 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 945 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
946 | /* iscsi host params */ |
947 | .get_host_param = iscsi_host_get_param, | |
948 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
949 | /* IO */ |
950 | .send_pdu = iscsi_conn_send_pdu, | |
951 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
952 | .init_task = iscsi_iser_task_init, |
953 | .xmit_task = iscsi_iser_task_xmit, | |
954 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 955 | .alloc_pdu = iscsi_iser_pdu_alloc, |
0a7a08ad | 956 | .check_protection = iscsi_iser_check_protection, |
65e7ae7b OG |
957 | /* recovery */ |
958 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
959 | ||
960 | .ep_connect = iscsi_iser_ep_connect, | |
961 | .ep_poll = iscsi_iser_ep_poll, | |
962 | .ep_disconnect = iscsi_iser_ep_disconnect | |
963 | }; | |
964 | ||
965 | static int __init iser_init(void) | |
966 | { | |
967 | int err; | |
968 | ||
969 | iser_dbg("Starting iSER datamover...\n"); | |
970 | ||
971 | if (iscsi_max_lun < 1) { | |
4f363882 | 972 | iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
65e7ae7b OG |
973 | return -EINVAL; |
974 | } | |
975 | ||
65e7ae7b OG |
976 | memset(&ig, 0, sizeof(struct iser_global)); |
977 | ||
978 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 979 | sizeof(struct iser_tx_desc), |
65e7ae7b | 980 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 981 | NULL); |
65e7ae7b OG |
982 | if (ig.desc_cache == NULL) |
983 | return -ENOMEM; | |
984 | ||
985 | /* device init is called only after the first addr resolution */ | |
986 | mutex_init(&ig.device_list_mutex); | |
987 | INIT_LIST_HEAD(&ig.device_list); | |
988 | mutex_init(&ig.connlist_mutex); | |
989 | INIT_LIST_HEAD(&ig.connlist); | |
990 | ||
b73c3ada AN |
991 | release_wq = alloc_workqueue("release workqueue", 0, 0); |
992 | if (!release_wq) { | |
993 | iser_err("failed to allocate release workqueue\n"); | |
994 | return -ENOMEM; | |
995 | } | |
996 | ||
75613521 MC |
997 | iscsi_iser_scsi_transport = iscsi_register_transport( |
998 | &iscsi_iser_transport); | |
999 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
1000 | iser_err("iscsi_register_transport failed\n"); |
1001 | err = -EINVAL; | |
1002 | goto register_transport_failure; | |
1003 | } | |
1004 | ||
1005 | return 0; | |
1006 | ||
1007 | register_transport_failure: | |
1008 | kmem_cache_destroy(ig.desc_cache); | |
1009 | ||
1010 | return err; | |
1011 | } | |
1012 | ||
1013 | static void __exit iser_exit(void) | |
1014 | { | |
5716af6e | 1015 | struct iser_conn *iser_conn, *n; |
b73c3ada AN |
1016 | int connlist_empty; |
1017 | ||
65e7ae7b | 1018 | iser_dbg("Removing iSER datamover...\n"); |
b73c3ada AN |
1019 | destroy_workqueue(release_wq); |
1020 | ||
1021 | mutex_lock(&ig.connlist_mutex); | |
1022 | connlist_empty = list_empty(&ig.connlist); | |
1023 | mutex_unlock(&ig.connlist_mutex); | |
1024 | ||
1025 | if (!connlist_empty) { | |
1026 | iser_err("Error cleanup stage completed but we still have iser " | |
1027 | "connections, destroying them anyway.\n"); | |
5716af6e SG |
1028 | list_for_each_entry_safe(iser_conn, n, &ig.connlist, |
1029 | conn_list) { | |
1030 | iser_conn_release(iser_conn); | |
b73c3ada AN |
1031 | } |
1032 | } | |
1033 | ||
65e7ae7b OG |
1034 | iscsi_unregister_transport(&iscsi_iser_transport); |
1035 | kmem_cache_destroy(ig.desc_cache); | |
1036 | } | |
1037 | ||
1038 | module_init(iser_init); | |
1039 | module_exit(iser_exit); |