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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 | |
7414dde0 SG |
167 | /** |
168 | * iser_initialize_task_headers() - Initialize task headers | |
169 | * @task: iscsi task | |
170 | * @tx_desc: iser tx descriptor | |
171 | * | |
172 | * Notes: | |
173 | * This routine may race with iser teardown flow for scsi | |
174 | * error handling TMFs. So for TMF we should acquire the | |
175 | * state mutex to avoid dereferencing the IB device which | |
176 | * may have already been terminated. | |
177 | */ | |
178 | int | |
179 | iser_initialize_task_headers(struct iscsi_task *task, | |
180 | struct iser_tx_desc *tx_desc) | |
f19624aa | 181 | { |
7414dde0 | 182 | struct iser_conn *iser_conn = task->conn->dd_data; |
a4ee3539 | 183 | struct iser_device *device = iser_conn->ib_conn.device; |
f19624aa OG |
184 | struct iscsi_iser_task *iser_task = task->dd_data; |
185 | u64 dma_addr; | |
7414dde0 SG |
186 | const bool mgmt_task = !task->sc && !in_interrupt(); |
187 | int ret = 0; | |
188 | ||
189 | if (unlikely(mgmt_task)) | |
190 | mutex_lock(&iser_conn->state_mutex); | |
191 | ||
192 | if (unlikely(iser_conn->state != ISER_CONN_UP)) { | |
193 | ret = -ENODEV; | |
194 | goto out; | |
195 | } | |
f19624aa OG |
196 | |
197 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
198 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
7414dde0 SG |
199 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) { |
200 | ret = -ENOMEM; | |
201 | goto out; | |
202 | } | |
f19624aa OG |
203 | |
204 | tx_desc->dma_addr = dma_addr; | |
205 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
206 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
207 | tx_desc->tx_sg[0].lkey = device->mr->lkey; | |
208 | ||
5716af6e | 209 | iser_task->iser_conn = iser_conn; |
7414dde0 SG |
210 | out: |
211 | if (unlikely(mgmt_task)) | |
212 | mutex_unlock(&iser_conn->state_mutex); | |
213 | ||
214 | return ret; | |
f19624aa | 215 | } |
dc05ac36 | 216 | |
65e7ae7b | 217 | /** |
dc05ac36 | 218 | * iscsi_iser_task_init() - Initialize iscsi-iser task |
2261ec3d | 219 | * @task: iscsi task |
65e7ae7b | 220 | * |
2261ec3d | 221 | * Initialize the task for the scsi command or mgmt command. |
dc05ac36 SG |
222 | * |
223 | * Return: Returns zero on success or -ENOMEM when failing | |
224 | * to init task headers (dma mapping error). | |
2747fdb2 | 225 | */ |
a8ac6311 | 226 | static int |
2261ec3d | 227 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 228 | { |
2261ec3d | 229 | struct iscsi_iser_task *iser_task = task->dd_data; |
7414dde0 | 230 | int ret; |
65e7ae7b | 231 | |
7414dde0 SG |
232 | ret = iser_initialize_task_headers(task, &iser_task->desc); |
233 | if (ret) { | |
234 | iser_err("Failed to init task %p, err = %d\n", | |
235 | iser_task, ret); | |
236 | return ret; | |
237 | } | |
f19624aa | 238 | |
2261ec3d | 239 | /* mgmt task */ |
f19624aa | 240 | if (!task->sc) |
2747fdb2 | 241 | return 0; |
65e7ae7b | 242 | |
2261ec3d | 243 | iser_task->command_sent = 0; |
2261ec3d | 244 | iser_task_rdma_init(iser_task); |
177e31bd SG |
245 | iser_task->sc = task->sc; |
246 | ||
a8ac6311 | 247 | return 0; |
65e7ae7b OG |
248 | } |
249 | ||
250 | /** | |
dc05ac36 | 251 | * iscsi_iser_mtask_xmit() - xmit management (immediate) task |
65e7ae7b | 252 | * @conn: iscsi connection |
2261ec3d | 253 | * @task: task management task |
65e7ae7b OG |
254 | * |
255 | * Notes: | |
256 | * The function can return -EAGAIN in which case caller must | |
257 | * call it again later, or recover. '0' return code means successful | |
258 | * xmit. | |
259 | * | |
260 | **/ | |
261 | static int | |
2261ec3d | 262 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
263 | { |
264 | int error = 0; | |
265 | ||
962b4b52 | 266 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 267 | |
2261ec3d | 268 | error = iser_send_control(conn, task); |
65e7ae7b | 269 | |
2261ec3d | 270 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
271 | * right after sending them. |
272 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
273 | * - if yes, the task is recycled at iscsi_complete_pdu |
274 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 275 | */ |
65e7ae7b OG |
276 | return error; |
277 | } | |
278 | ||
279 | static int | |
2747fdb2 | 280 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 281 | struct iscsi_task *task) |
65e7ae7b | 282 | { |
0f9c7449 MC |
283 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
284 | struct iscsi_data hdr; | |
65e7ae7b | 285 | int error = 0; |
65e7ae7b OG |
286 | |
287 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
288 | while (iscsi_task_has_unsol_data(task)) { |
289 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 290 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 291 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
292 | |
293 | /* the buffer description has been passed with the command */ | |
294 | /* Send the command */ | |
2261ec3d | 295 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 296 | if (error) { |
0f9c7449 | 297 | r2t->datasn--; |
2747fdb2 | 298 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 299 | } |
0f9c7449 | 300 | r2t->sent += r2t->data_count; |
48a237a2 | 301 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 302 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
303 | } |
304 | ||
2747fdb2 | 305 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
306 | return error; |
307 | } | |
308 | ||
dc05ac36 SG |
309 | /** |
310 | * iscsi_iser_task_xmit() - xmit iscsi-iser task | |
311 | * @task: iscsi task | |
312 | * | |
313 | * Return: zero on success or escalates $error on failure. | |
314 | */ | |
65e7ae7b | 315 | static int |
2261ec3d | 316 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 317 | { |
2261ec3d MC |
318 | struct iscsi_conn *conn = task->conn; |
319 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
320 | int error = 0; |
321 | ||
2261ec3d MC |
322 | if (!task->sc) |
323 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 324 | |
2261ec3d MC |
325 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
326 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 327 | |
48a237a2 | 328 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 329 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 330 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
331 | } |
332 | ||
962b4b52 | 333 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 334 | conn->id, task->itt); |
65e7ae7b | 335 | |
65e7ae7b | 336 | /* Send the cmd PDU */ |
2261ec3d MC |
337 | if (!iser_task->command_sent) { |
338 | error = iser_send_command(conn, task); | |
65e7ae7b | 339 | if (error) |
2747fdb2 | 340 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 341 | iser_task->command_sent = 1; |
65e7ae7b OG |
342 | } |
343 | ||
344 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 345 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 346 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 347 | |
2747fdb2 | 348 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
349 | return error; |
350 | } | |
351 | ||
dc05ac36 SG |
352 | /** |
353 | * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task | |
354 | * @task: iscsi task | |
355 | * | |
356 | * Notes: In case the RDMA device is already NULL (might have | |
357 | * been removed in DEVICE_REMOVAL CM event it will bail-out | |
358 | * without doing dma unmapping. | |
359 | */ | |
0f9c7449 | 360 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 361 | { |
2261ec3d | 362 | struct iscsi_iser_task *iser_task = task->dd_data; |
4667f5df | 363 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
5716af6e | 364 | struct iser_conn *iser_conn = task->conn->dd_data; |
a4ee3539 | 365 | struct iser_device *device = iser_conn->ib_conn.device; |
52439540 | 366 | |
3a940daf SG |
367 | /* DEVICE_REMOVAL event might have already released the device */ |
368 | if (!device) | |
369 | return; | |
370 | ||
52439540 OG |
371 | ib_dma_unmap_single(device->ib_device, |
372 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
65e7ae7b | 373 | |
b3cd5050 MC |
374 | /* mgmt tasks do not need special cleanup */ |
375 | if (!task->sc) | |
2747fdb2 | 376 | return; |
65e7ae7b | 377 | |
2261ec3d MC |
378 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
379 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
380 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 381 | } |
65e7ae7b OG |
382 | } |
383 | ||
dc05ac36 SG |
384 | /** |
385 | * iscsi_iser_check_protection() - check protection information status of task. | |
386 | * @task: iscsi task | |
387 | * @sector: error sector if exsists (output) | |
388 | * | |
389 | * Return: zero if no data-integrity errors have occured | |
390 | * 0x1: data-integrity error occured in the guard-block | |
391 | * 0x2: data-integrity error occured in the reference tag | |
392 | * 0x3: data-integrity error occured in the application tag | |
393 | * | |
394 | * In addition the error sector is marked. | |
395 | */ | |
396 | static u8 | |
397 | iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) | |
0a7a08ad SG |
398 | { |
399 | struct iscsi_iser_task *iser_task = task->dd_data; | |
400 | ||
401 | if (iser_task->dir[ISER_DIR_IN]) | |
402 | return iser_check_task_pi_status(iser_task, ISER_DIR_IN, | |
403 | sector); | |
404 | else | |
405 | return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, | |
406 | sector); | |
407 | } | |
408 | ||
dc05ac36 SG |
409 | /** |
410 | * iscsi_iser_conn_create() - create a new iscsi-iser connection | |
411 | * @cls_session: iscsi class connection | |
412 | * @conn_idx: connection index within the session (for MCS) | |
413 | * | |
414 | * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL | |
415 | * otherwise. | |
416 | */ | |
65e7ae7b | 417 | static struct iscsi_cls_conn * |
dc05ac36 SG |
418 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, |
419 | uint32_t conn_idx) | |
65e7ae7b OG |
420 | { |
421 | struct iscsi_conn *conn; | |
422 | struct iscsi_cls_conn *cls_conn; | |
65e7ae7b | 423 | |
4667f5df | 424 | cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); |
65e7ae7b OG |
425 | if (!cls_conn) |
426 | return NULL; | |
427 | conn = cls_conn->dd_data; | |
428 | ||
429 | /* | |
430 | * due to issues with the login code re iser sematics | |
431 | * this not set in iscsi_conn_setup - FIXME | |
432 | */ | |
bcc60c38 | 433 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 434 | |
65e7ae7b | 435 | return cls_conn; |
65e7ae7b OG |
436 | } |
437 | ||
dc05ac36 SG |
438 | /** |
439 | * iscsi_iser_conn_bind() - bind iscsi and iser connection structures | |
440 | * @cls_session: iscsi class session | |
441 | * @cls_conn: iscsi class connection | |
442 | * @transport_eph: transport end-point handle | |
443 | * @is_leading: indicate if this is the session leading connection (MCS) | |
444 | * | |
445 | * Return: zero on success, $error if iscsi_conn_bind fails and | |
446 | * -EINVAL in case end-point doesn't exsits anymore or iser connection | |
447 | * state is not UP (teardown already started). | |
448 | */ | |
65e7ae7b OG |
449 | static int |
450 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
dc05ac36 SG |
451 | struct iscsi_cls_conn *cls_conn, |
452 | uint64_t transport_eph, | |
65e7ae7b OG |
453 | int is_leading) |
454 | { | |
455 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 456 | struct iser_conn *iser_conn; |
412eeafa | 457 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
458 | int error; |
459 | ||
460 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
461 | if (error) | |
462 | return error; | |
463 | ||
464 | /* the transport ep handle comes from user space so it must be | |
465 | * verified against the global ib connections list */ | |
412eeafa MC |
466 | ep = iscsi_lookup_endpoint(transport_eph); |
467 | if (!ep) { | |
65e7ae7b OG |
468 | iser_err("can't bind eph %llx\n", |
469 | (unsigned long long)transport_eph); | |
470 | return -EINVAL; | |
471 | } | |
5716af6e | 472 | iser_conn = ep->dd_data; |
412eeafa | 473 | |
5716af6e SG |
474 | mutex_lock(&iser_conn->state_mutex); |
475 | if (iser_conn->state != ISER_CONN_UP) { | |
91eb1df3 SG |
476 | error = -EINVAL; |
477 | iser_err("iser_conn %p state is %d, teardown started\n", | |
5716af6e | 478 | iser_conn, iser_conn->state); |
91eb1df3 SG |
479 | goto out; |
480 | } | |
481 | ||
5716af6e | 482 | error = iser_alloc_rx_descriptors(iser_conn, conn->session); |
91eb1df3 SG |
483 | if (error) |
484 | goto out; | |
89e984e2 | 485 | |
65e7ae7b OG |
486 | /* binds the iSER connection retrieved from the previously |
487 | * connected ep_handle to the iSCSI layer connection. exchanges | |
488 | * connection pointers */ | |
5716af6e | 489 | iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); |
4667f5df | 490 | |
5716af6e SG |
491 | conn->dd_data = iser_conn; |
492 | iser_conn->iscsi_conn = conn; | |
4667f5df | 493 | |
91eb1df3 | 494 | out: |
5716af6e | 495 | mutex_unlock(&iser_conn->state_mutex); |
91eb1df3 | 496 | return error; |
65e7ae7b | 497 | } |
65e7ae7b | 498 | |
dc05ac36 SG |
499 | /** |
500 | * iscsi_iser_conn_start() - start iscsi-iser connection | |
501 | * @cls_conn: iscsi class connection | |
502 | * | |
503 | * Notes: Here iser intialize (or re-initialize) stop_completion as | |
504 | * from this point iscsi must call conn_stop in session/connection | |
505 | * teardown so iser transport must wait for it. | |
506 | */ | |
b73c3ada AN |
507 | static int |
508 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
509 | { | |
510 | struct iscsi_conn *iscsi_conn; | |
5716af6e | 511 | struct iser_conn *iser_conn; |
b73c3ada AN |
512 | |
513 | iscsi_conn = cls_conn->dd_data; | |
5716af6e SG |
514 | iser_conn = iscsi_conn->dd_data; |
515 | reinit_completion(&iser_conn->stop_completion); | |
b73c3ada AN |
516 | |
517 | return iscsi_conn_start(cls_conn); | |
518 | } | |
519 | ||
dc05ac36 SG |
520 | /** |
521 | * iscsi_iser_conn_stop() - stop iscsi-iser connection | |
522 | * @cls_conn: iscsi class connection | |
523 | * @flag: indicate if recover or terminate (passed as is) | |
524 | * | |
525 | * Notes: Calling iscsi_conn_stop might theoretically race with | |
526 | * DEVICE_REMOVAL event and dereference a previously freed RDMA device | |
527 | * handle, so we call it under iser the state lock to protect against | |
528 | * this kind of race. | |
529 | */ | |
b40977d9 MC |
530 | static void |
531 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
532 | { | |
533 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 534 | struct iser_conn *iser_conn = conn->dd_data; |
65e7ae7b | 535 | |
bba0a3c9 | 536 | iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); |
b73c3ada | 537 | |
b40977d9 | 538 | /* |
913e5bf4 MC |
539 | * Userspace may have goofed up and not bound the connection or |
540 | * might have only partially setup the connection. | |
b40977d9 | 541 | */ |
5716af6e | 542 | if (iser_conn) { |
ec370e2b AN |
543 | mutex_lock(&iser_conn->state_mutex); |
544 | iser_conn_terminate(iser_conn); | |
f0caef6d | 545 | iscsi_conn_stop(cls_conn, flag); |
ec370e2b AN |
546 | |
547 | /* unbind */ | |
548 | iser_conn->iscsi_conn = NULL; | |
b73c3ada | 549 | conn->dd_data = NULL; |
ec370e2b | 550 | |
5716af6e | 551 | complete(&iser_conn->stop_completion); |
ec370e2b | 552 | mutex_unlock(&iser_conn->state_mutex); |
3a940daf SG |
553 | } else { |
554 | iscsi_conn_stop(cls_conn, flag); | |
913e5bf4 | 555 | } |
65e7ae7b OG |
556 | } |
557 | ||
dc05ac36 SG |
558 | /** |
559 | * iscsi_iser_session_destroy() - destroy iscsi-iser session | |
560 | * @cls_session: iscsi class session | |
561 | * | |
562 | * Removes and free iscsi host. | |
563 | */ | |
564 | static void | |
565 | iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) | |
75613521 MC |
566 | { |
567 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
568 | ||
e5bd7b54 | 569 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
570 | iscsi_host_remove(shost); |
571 | iscsi_host_free(shost); | |
75613521 | 572 | } |
65e7ae7b | 573 | |
6192d4e6 SG |
574 | static inline unsigned int |
575 | iser_dif_prot_caps(int prot_caps) | |
576 | { | |
577 | return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION | | |
578 | SHOST_DIX_TYPE1_PROTECTION : 0) | | |
579 | ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION | | |
580 | SHOST_DIX_TYPE2_PROTECTION : 0) | | |
581 | ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION | | |
582 | SHOST_DIX_TYPE3_PROTECTION : 0); | |
583 | } | |
584 | ||
dc05ac36 SG |
585 | /** |
586 | * iscsi_iser_session_create() - create an iscsi-iser session | |
587 | * @ep: iscsi end-point handle | |
588 | * @cmds_max: maximum commands in this session | |
589 | * @qdepth: session command queue depth | |
590 | * @initial_cmdsn: initiator command sequnce number | |
591 | * | |
592 | * Allocates and adds a scsi host, expose DIF supprot if | |
593 | * exists, and sets up an iscsi session. | |
594 | */ | |
65e7ae7b | 595 | static struct iscsi_cls_session * |
412eeafa | 596 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 597 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 598 | uint32_t initial_cmdsn) |
65e7ae7b OG |
599 | { |
600 | struct iscsi_cls_session *cls_session; | |
601 | struct iscsi_session *session; | |
412eeafa | 602 | struct Scsi_Host *shost; |
5716af6e | 603 | struct iser_conn *iser_conn = NULL; |
a4ee3539 | 604 | struct ib_conn *ib_conn; |
f4641ef7 | 605 | u16 max_cmds; |
75613521 | 606 | |
962b4b52 | 607 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
608 | if (!shost) |
609 | return NULL; | |
610 | shost->transportt = iscsi_iser_scsi_transport; | |
b7f04513 | 611 | shost->cmd_per_lun = qdepth; |
75613521 MC |
612 | shost->max_lun = iscsi_max_lun; |
613 | shost->max_id = 0; | |
614 | shost->max_channel = 0; | |
615 | shost->max_cmd_len = 16; | |
616 | ||
412eeafa MC |
617 | /* |
618 | * older userspace tools (before 2.0-870) did not pass us | |
619 | * the leading conn's ep so this will be NULL; | |
620 | */ | |
6192d4e6 | 621 | if (ep) { |
5716af6e | 622 | iser_conn = ep->dd_data; |
f4641ef7 | 623 | max_cmds = iser_conn->max_cmds; |
3f562a0b AN |
624 | |
625 | mutex_lock(&iser_conn->state_mutex); | |
626 | if (iser_conn->state != ISER_CONN_UP) { | |
627 | iser_err("iser conn %p already started teardown\n", | |
628 | iser_conn); | |
629 | mutex_unlock(&iser_conn->state_mutex); | |
630 | goto free_host; | |
631 | } | |
632 | ||
a4ee3539 SG |
633 | ib_conn = &iser_conn->ib_conn; |
634 | if (ib_conn->pi_support) { | |
635 | u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; | |
6192d4e6 SG |
636 | |
637 | scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); | |
638 | if (iser_pi_guard) | |
639 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); | |
640 | else | |
641 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC); | |
642 | } | |
3f562a0b AN |
643 | |
644 | if (iscsi_host_add(shost, | |
645 | ib_conn->device->ib_device->dma_device)) { | |
646 | mutex_unlock(&iser_conn->state_mutex); | |
647 | goto free_host; | |
648 | } | |
649 | mutex_unlock(&iser_conn->state_mutex); | |
f4641ef7 MT |
650 | } else { |
651 | max_cmds = ISER_DEF_XMIT_CMDS_MAX; | |
3f562a0b AN |
652 | if (iscsi_host_add(shost, NULL)) |
653 | goto free_host; | |
6192d4e6 | 654 | } |
412eeafa | 655 | |
f4641ef7 | 656 | if (cmds_max > max_cmds) { |
b7f04513 | 657 | iser_info("cmds_max changed from %u to %u\n", |
f4641ef7 MT |
658 | cmds_max, max_cmds); |
659 | cmds_max = max_cmds; | |
b7f04513 SP |
660 | } |
661 | ||
75613521 | 662 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b7f04513 | 663 | cmds_max, 0, |
2261ec3d | 664 | sizeof(struct iscsi_iser_task), |
7970634b | 665 | initial_cmdsn, 0); |
65e7ae7b | 666 | if (!cls_session) |
75613521 MC |
667 | goto remove_host; |
668 | session = cls_session->dd_data; | |
65e7ae7b | 669 | |
2747fdb2 | 670 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 671 | return cls_session; |
75613521 MC |
672 | |
673 | remove_host: | |
a4804cd6 | 674 | iscsi_host_remove(shost); |
75613521 | 675 | free_host: |
a4804cd6 | 676 | iscsi_host_free(shost); |
75613521 | 677 | return NULL; |
65e7ae7b OG |
678 | } |
679 | ||
680 | static int | |
358ff019 MC |
681 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
682 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 683 | { |
358ff019 | 684 | int value; |
65e7ae7b OG |
685 | |
686 | switch (param) { | |
687 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
688 | /* TBD */ | |
689 | break; | |
65e7ae7b | 690 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 691 | sscanf(buf, "%d", &value); |
65e7ae7b | 692 | if (value) { |
e7eeffa4 | 693 | iser_err("DataDigest wasn't negotiated to None\n"); |
65e7ae7b OG |
694 | return -EPROTO; |
695 | } | |
696 | break; | |
697 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 698 | sscanf(buf, "%d", &value); |
65e7ae7b | 699 | if (value) { |
e7eeffa4 | 700 | iser_err("DataDigest wasn't negotiated to None\n"); |
65e7ae7b OG |
701 | return -EPROTO; |
702 | } | |
703 | break; | |
65e7ae7b | 704 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 705 | sscanf(buf, "%d", &value); |
65e7ae7b | 706 | if (value) { |
e7eeffa4 | 707 | iser_err("IFMarker wasn't negotiated to No\n"); |
65e7ae7b OG |
708 | return -EPROTO; |
709 | } | |
710 | break; | |
711 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 712 | sscanf(buf, "%d", &value); |
65e7ae7b | 713 | if (value) { |
e7eeffa4 | 714 | iser_err("OFMarker wasn't negotiated to No\n"); |
65e7ae7b OG |
715 | return -EPROTO; |
716 | } | |
717 | break; | |
718 | default: | |
358ff019 | 719 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
720 | } |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
dc05ac36 SG |
725 | /** |
726 | * iscsi_iser_set_param() - set class connection parameter | |
727 | * @cls_conn: iscsi class connection | |
728 | * @stats: iscsi stats to output | |
729 | * | |
730 | * Output connection statistics. | |
731 | */ | |
65e7ae7b OG |
732 | static void |
733 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
734 | { | |
735 | struct iscsi_conn *conn = cls_conn->dd_data; | |
736 | ||
737 | stats->txdata_octets = conn->txdata_octets; | |
738 | stats->rxdata_octets = conn->rxdata_octets; | |
739 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
740 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
741 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
742 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
743 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
744 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
745 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 746 | stats->custom_length = 4; |
65e7ae7b OG |
747 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
748 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
749 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
750 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
751 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
752 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
753 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
754 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
755 | } |
756 | ||
7c53c6f8 MC |
757 | static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
758 | enum iscsi_param param, char *buf) | |
759 | { | |
5716af6e | 760 | struct iser_conn *iser_conn = ep->dd_data; |
7c53c6f8 MC |
761 | int len; |
762 | ||
763 | switch (param) { | |
764 | case ISCSI_PARAM_CONN_PORT: | |
765 | case ISCSI_PARAM_CONN_ADDRESS: | |
a4ee3539 | 766 | if (!iser_conn || !iser_conn->ib_conn.cma_id) |
7c53c6f8 MC |
767 | return -ENOTCONN; |
768 | ||
769 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
a4ee3539 SG |
770 | &iser_conn->ib_conn.cma_id->route.addr.dst_addr, |
771 | param, buf); | |
7c53c6f8 MC |
772 | break; |
773 | default: | |
774 | return -ENOSYS; | |
775 | } | |
776 | ||
777 | return len; | |
778 | } | |
779 | ||
dc05ac36 SG |
780 | /** |
781 | * iscsi_iser_ep_connect() - Initiate iSER connection establishment | |
782 | * @shost: scsi_host | |
783 | * @dst_addr: destination address | |
784 | * @non-blocking: indicate if routine can block | |
785 | * | |
786 | * Allocate an iscsi endpoint, an iser_conn structure and bind them. | |
787 | * After that start RDMA connection establishment via rdma_cm. We | |
788 | * don't allocate iser_conn embedded in iscsi_endpoint since in teardown | |
789 | * the endpoint will be destroyed at ep_disconnect while iser_conn will | |
790 | * cleanup its resources asynchronuously. | |
791 | * | |
792 | * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) | |
793 | * if fails. | |
794 | */ | |
412eeafa | 795 | static struct iscsi_endpoint * |
10eb0f01 MC |
796 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
797 | int non_blocking) | |
65e7ae7b OG |
798 | { |
799 | int err; | |
5716af6e | 800 | struct iser_conn *iser_conn; |
412eeafa | 801 | struct iscsi_endpoint *ep; |
65e7ae7b | 802 | |
0a690758 | 803 | ep = iscsi_create_endpoint(0); |
412eeafa MC |
804 | if (!ep) |
805 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 806 | |
5716af6e SG |
807 | iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
808 | if (!iser_conn) { | |
0a690758 AN |
809 | err = -ENOMEM; |
810 | goto failure; | |
811 | } | |
812 | ||
5716af6e SG |
813 | ep->dd_data = iser_conn; |
814 | iser_conn->ep = ep; | |
815 | iser_conn_init(iser_conn); | |
65e7ae7b | 816 | |
5716af6e | 817 | err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); |
7d9c0de4 | 818 | if (err) |
0a690758 | 819 | goto failure; |
7d9c0de4 | 820 | |
412eeafa | 821 | return ep; |
0a690758 AN |
822 | failure: |
823 | iscsi_destroy_endpoint(ep); | |
824 | return ERR_PTR(err); | |
65e7ae7b OG |
825 | } |
826 | ||
dc05ac36 SG |
827 | /** |
828 | * iscsi_iser_ep_poll() - poll for iser connection establishment to complete | |
829 | * @ep: iscsi endpoint (created at ep_connect) | |
830 | * @timeout_ms: polling timeout allowed in ms. | |
831 | * | |
832 | * This routine boils down to waiting for up_completion signaling | |
833 | * that cma_id got CONNECTED event. | |
834 | * | |
835 | * Return: 1 if succeeded in connection establishment, 0 if timeout expired | |
836 | * (libiscsi will retry will kick in) or -1 if interrupted by signal | |
837 | * or more likely iser connection state transitioned to TEMINATING or | |
838 | * DOWN during the wait period. | |
839 | */ | |
65e7ae7b | 840 | static int |
412eeafa | 841 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 842 | { |
5716af6e | 843 | struct iser_conn *iser_conn; |
65e7ae7b OG |
844 | int rc; |
845 | ||
5716af6e SG |
846 | iser_conn = ep->dd_data; |
847 | rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, | |
9a6d3234 | 848 | msecs_to_jiffies(timeout_ms)); |
65e7ae7b | 849 | /* if conn establishment failed, return error code to iscsi */ |
504130c0 | 850 | if (rc == 0) { |
5716af6e SG |
851 | mutex_lock(&iser_conn->state_mutex); |
852 | if (iser_conn->state == ISER_CONN_TERMINATING || | |
853 | iser_conn->state == ISER_CONN_DOWN) | |
504130c0 | 854 | rc = -1; |
5716af6e | 855 | mutex_unlock(&iser_conn->state_mutex); |
504130c0 | 856 | } |
65e7ae7b | 857 | |
5716af6e | 858 | iser_info("ib conn %p rc = %d\n", iser_conn, rc); |
65e7ae7b OG |
859 | |
860 | if (rc > 0) | |
861 | return 1; /* success, this is the equivalent of POLLOUT */ | |
862 | else if (!rc) | |
863 | return 0; /* timeout */ | |
864 | else | |
865 | return rc; /* signal */ | |
866 | } | |
867 | ||
dc05ac36 SG |
868 | /** |
869 | * iscsi_iser_ep_disconnect() - Initiate connection teardown process | |
870 | * @ep: iscsi endpoint handle | |
871 | * | |
872 | * This routine is not blocked by iser and RDMA termination process | |
873 | * completion as we queue a deffered work for iser/RDMA destruction | |
874 | * and cleanup or actually call it immediately in case we didn't pass | |
875 | * iscsi conn bind/start stage, thus it is safe. | |
876 | */ | |
65e7ae7b | 877 | static void |
412eeafa | 878 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 879 | { |
5716af6e | 880 | struct iser_conn *iser_conn; |
65e7ae7b | 881 | |
5716af6e SG |
882 | iser_conn = ep->dd_data; |
883 | iser_info("ep %p iser conn %p state %d\n", | |
884 | ep, iser_conn, iser_conn->state); | |
885 | ||
886 | mutex_lock(&iser_conn->state_mutex); | |
887 | iser_conn_terminate(iser_conn); | |
b73c3ada AN |
888 | |
889 | /* | |
9a6d3234 AN |
890 | * if iser_conn and iscsi_conn are bound, we must wait for |
891 | * iscsi_conn_stop and flush errors completion before freeing | |
892 | * the iser resources. Otherwise we are safe to free resources | |
893 | * immediately. | |
b73c3ada | 894 | */ |
5716af6e SG |
895 | if (iser_conn->iscsi_conn) { |
896 | INIT_WORK(&iser_conn->release_work, iser_release_work); | |
897 | queue_work(release_wq, &iser_conn->release_work); | |
898 | mutex_unlock(&iser_conn->state_mutex); | |
b73c3ada | 899 | } else { |
5716af6e SG |
900 | iser_conn->state = ISER_CONN_DOWN; |
901 | mutex_unlock(&iser_conn->state_mutex); | |
902 | iser_conn_release(iser_conn); | |
b73c3ada | 903 | } |
0a690758 | 904 | iscsi_destroy_endpoint(ep); |
65e7ae7b OG |
905 | } |
906 | ||
587a1f16 | 907 | static umode_t iser_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
908 | { |
909 | switch (param_type) { | |
f27fb2ef MC |
910 | case ISCSI_HOST_PARAM: |
911 | switch (param) { | |
912 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
913 | case ISCSI_HOST_PARAM_HWADDRESS: | |
914 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
915 | return S_IRUGO; | |
916 | default: | |
917 | return 0; | |
918 | } | |
3128c6c7 MC |
919 | case ISCSI_PARAM: |
920 | switch (param) { | |
921 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
922 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
923 | case ISCSI_PARAM_HDRDGST_EN: | |
924 | case ISCSI_PARAM_DATADGST_EN: | |
925 | case ISCSI_PARAM_CONN_ADDRESS: | |
926 | case ISCSI_PARAM_CONN_PORT: | |
927 | case ISCSI_PARAM_EXP_STATSN: | |
928 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
929 | case ISCSI_PARAM_PERSISTENT_PORT: | |
930 | case ISCSI_PARAM_PING_TMO: | |
931 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
932 | case ISCSI_PARAM_INITIAL_R2T_EN: |
933 | case ISCSI_PARAM_MAX_R2T: | |
934 | case ISCSI_PARAM_IMM_DATA_EN: | |
935 | case ISCSI_PARAM_FIRST_BURST: | |
936 | case ISCSI_PARAM_MAX_BURST: | |
937 | case ISCSI_PARAM_PDU_INORDER_EN: | |
938 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
939 | case ISCSI_PARAM_TARGET_NAME: | |
940 | case ISCSI_PARAM_TPGT: | |
941 | case ISCSI_PARAM_USERNAME: | |
942 | case ISCSI_PARAM_PASSWORD: | |
943 | case ISCSI_PARAM_USERNAME_IN: | |
944 | case ISCSI_PARAM_PASSWORD_IN: | |
945 | case ISCSI_PARAM_FAST_ABORT: | |
946 | case ISCSI_PARAM_ABORT_TMO: | |
947 | case ISCSI_PARAM_LU_RESET_TMO: | |
948 | case ISCSI_PARAM_TGT_RESET_TMO: | |
949 | case ISCSI_PARAM_IFACE_NAME: | |
950 | case ISCSI_PARAM_INITIATOR_NAME: | |
6a06a4b8 | 951 | case ISCSI_PARAM_DISCOVERY_SESS: |
3128c6c7 MC |
952 | return S_IRUGO; |
953 | default: | |
954 | return 0; | |
955 | } | |
956 | } | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
65e7ae7b | 961 | static struct scsi_host_template iscsi_iser_sht = { |
7974392c | 962 | .module = THIS_MODULE, |
c1d786e6 | 963 | .name = "iSCSI Initiator over iSER", |
65e7ae7b | 964 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 965 | .change_queue_depth = scsi_change_queue_depth, |
65e7ae7b | 966 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 967 | .max_sectors = 1024, |
e28f3d5b | 968 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 969 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 970 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 971 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 972 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
973 | .use_clustering = DISABLE_CLUSTERING, |
974 | .proc_name = "iscsi_iser", | |
975 | .this_id = -1, | |
c40ecc12 | 976 | .track_queue_depth = 1, |
65e7ae7b OG |
977 | }; |
978 | ||
979 | static struct iscsi_transport iscsi_iser_transport = { | |
980 | .owner = THIS_MODULE, | |
981 | .name = "iser", | |
6a06a4b8 | 982 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, |
65e7ae7b OG |
983 | /* session management */ |
984 | .create_session = iscsi_iser_session_create, | |
75613521 | 985 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
986 | /* connection management */ |
987 | .create_conn = iscsi_iser_conn_create, | |
988 | .bind_conn = iscsi_iser_conn_bind, | |
b73c3ada | 989 | .destroy_conn = iscsi_conn_teardown, |
3128c6c7 | 990 | .attr_is_visible = iser_attr_is_visible, |
358ff019 MC |
991 | .set_param = iscsi_iser_set_param, |
992 | .get_conn_param = iscsi_conn_get_param, | |
7c53c6f8 | 993 | .get_ep_param = iscsi_iser_get_ep_param, |
358ff019 | 994 | .get_session_param = iscsi_session_get_param, |
b73c3ada | 995 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 996 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
997 | /* iscsi host params */ |
998 | .get_host_param = iscsi_host_get_param, | |
999 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
1000 | /* IO */ |
1001 | .send_pdu = iscsi_conn_send_pdu, | |
1002 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
1003 | .init_task = iscsi_iser_task_init, |
1004 | .xmit_task = iscsi_iser_task_xmit, | |
1005 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 1006 | .alloc_pdu = iscsi_iser_pdu_alloc, |
0a7a08ad | 1007 | .check_protection = iscsi_iser_check_protection, |
65e7ae7b OG |
1008 | /* recovery */ |
1009 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
1010 | ||
1011 | .ep_connect = iscsi_iser_ep_connect, | |
1012 | .ep_poll = iscsi_iser_ep_poll, | |
1013 | .ep_disconnect = iscsi_iser_ep_disconnect | |
1014 | }; | |
1015 | ||
1016 | static int __init iser_init(void) | |
1017 | { | |
1018 | int err; | |
1019 | ||
1020 | iser_dbg("Starting iSER datamover...\n"); | |
1021 | ||
1022 | if (iscsi_max_lun < 1) { | |
4f363882 | 1023 | iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
65e7ae7b OG |
1024 | return -EINVAL; |
1025 | } | |
1026 | ||
65e7ae7b OG |
1027 | memset(&ig, 0, sizeof(struct iser_global)); |
1028 | ||
1029 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 1030 | sizeof(struct iser_tx_desc), |
65e7ae7b | 1031 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 1032 | NULL); |
65e7ae7b OG |
1033 | if (ig.desc_cache == NULL) |
1034 | return -ENOMEM; | |
1035 | ||
1036 | /* device init is called only after the first addr resolution */ | |
1037 | mutex_init(&ig.device_list_mutex); | |
1038 | INIT_LIST_HEAD(&ig.device_list); | |
1039 | mutex_init(&ig.connlist_mutex); | |
1040 | INIT_LIST_HEAD(&ig.connlist); | |
1041 | ||
b73c3ada AN |
1042 | release_wq = alloc_workqueue("release workqueue", 0, 0); |
1043 | if (!release_wq) { | |
1044 | iser_err("failed to allocate release workqueue\n"); | |
1045 | return -ENOMEM; | |
1046 | } | |
1047 | ||
75613521 MC |
1048 | iscsi_iser_scsi_transport = iscsi_register_transport( |
1049 | &iscsi_iser_transport); | |
1050 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
1051 | iser_err("iscsi_register_transport failed\n"); |
1052 | err = -EINVAL; | |
1053 | goto register_transport_failure; | |
1054 | } | |
1055 | ||
1056 | return 0; | |
1057 | ||
1058 | register_transport_failure: | |
1059 | kmem_cache_destroy(ig.desc_cache); | |
1060 | ||
1061 | return err; | |
1062 | } | |
1063 | ||
1064 | static void __exit iser_exit(void) | |
1065 | { | |
5716af6e | 1066 | struct iser_conn *iser_conn, *n; |
b73c3ada AN |
1067 | int connlist_empty; |
1068 | ||
65e7ae7b | 1069 | iser_dbg("Removing iSER datamover...\n"); |
b73c3ada AN |
1070 | destroy_workqueue(release_wq); |
1071 | ||
1072 | mutex_lock(&ig.connlist_mutex); | |
1073 | connlist_empty = list_empty(&ig.connlist); | |
1074 | mutex_unlock(&ig.connlist_mutex); | |
1075 | ||
1076 | if (!connlist_empty) { | |
1077 | iser_err("Error cleanup stage completed but we still have iser " | |
1078 | "connections, destroying them anyway.\n"); | |
5716af6e SG |
1079 | list_for_each_entry_safe(iser_conn, n, &ig.connlist, |
1080 | conn_list) { | |
1081 | iser_conn_release(iser_conn); | |
b73c3ada AN |
1082 | } |
1083 | } | |
1084 | ||
65e7ae7b OG |
1085 | iscsi_unregister_transport(&iscsi_iser_transport); |
1086 | kmem_cache_destroy(ig.desc_cache); | |
1087 | } | |
1088 | ||
1089 | module_init(iser_init); | |
1090 | module_exit(iser_exit); |