]>
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 | ||
db0a6cbd JF |
77 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); |
78 | MODULE_LICENSE("Dual BSD/GPL"); | |
79 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); | |
80 | MODULE_VERSION(DRV_VER); | |
81 | ||
75613521 MC |
82 | static struct scsi_host_template iscsi_iser_sht; |
83 | static struct iscsi_transport iscsi_iser_transport; | |
84 | static struct scsi_transport_template *iscsi_iser_scsi_transport; | |
db0a6cbd JF |
85 | static struct workqueue_struct *release_wq; |
86 | struct iser_global ig; | |
87 | ||
88 | int iser_debug_level = 0; | |
89 | module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR); | |
90 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); | |
75613521 | 91 | |
65e7ae7b OG |
92 | static unsigned int iscsi_max_lun = 512; |
93 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
db0a6cbd | 94 | MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session (default:512"); |
65e7ae7b | 95 | |
df749cdc SG |
96 | unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS; |
97 | module_param_named(max_sectors, iser_max_sectors, uint, S_IRUGO | S_IWUSR); | |
98 | MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command (default:1024"); | |
99 | ||
3cffd930 SG |
100 | bool iser_always_reg = true; |
101 | module_param_named(always_register, iser_always_reg, bool, S_IRUGO); | |
102 | MODULE_PARM_DESC(always_register, | |
103 | "Always register memory, even for continuous memory regions (default:true)"); | |
104 | ||
7f733847 | 105 | bool iser_pi_enable = false; |
db0a6cbd | 106 | module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO); |
7f733847 AT |
107 | MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); |
108 | ||
db0a6cbd JF |
109 | int iser_pi_guard; |
110 | module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO); | |
5bb6e543 | 111 | MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); |
7f733847 | 112 | |
dc05ac36 SG |
113 | /* |
114 | * iscsi_iser_recv() - Process a successfull recv completion | |
115 | * @conn: iscsi connection | |
116 | * @hdr: iscsi header | |
117 | * @rx_data: buffer containing receive data payload | |
118 | * @rx_data_len: length of rx_data | |
119 | * | |
120 | * Notes: In case of data length errors or iscsi PDU completion failures | |
121 | * this routine will signal iscsi layer of connection failure. | |
122 | */ | |
65e7ae7b | 123 | void |
dc05ac36 SG |
124 | iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
125 | char *rx_data, int rx_data_len) | |
65e7ae7b OG |
126 | { |
127 | int rc = 0; | |
65e7ae7b OG |
128 | int datalen; |
129 | int ahslen; | |
130 | ||
131 | /* verify PDU length */ | |
132 | datalen = ntoh24(hdr->dlength); | |
200ae1a0 OG |
133 | if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { |
134 | iser_err("wrong datalen %d (hdr), %d (IB)\n", | |
135 | datalen, rx_data_len); | |
65e7ae7b OG |
136 | rc = ISCSI_ERR_DATALEN; |
137 | goto error; | |
138 | } | |
139 | ||
200ae1a0 OG |
140 | if (datalen != rx_data_len) |
141 | iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", | |
142 | datalen, rx_data_len); | |
143 | ||
65e7ae7b OG |
144 | /* read AHS */ |
145 | ahslen = hdr->hlength * 4; | |
146 | ||
0af967f5 | 147 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
148 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
149 | goto error; | |
150 | ||
151 | return; | |
152 | error: | |
153 | iscsi_conn_failure(conn, rc); | |
154 | } | |
155 | ||
dc05ac36 SG |
156 | /** |
157 | * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU | |
158 | * @task: iscsi task | |
159 | * @opcode: iscsi command opcode | |
160 | * | |
161 | * Netes: This routine can't fail, just assign iscsi task | |
162 | * hdr and max hdr size. | |
163 | */ | |
164 | static int | |
165 | iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) | |
0f9c7449 MC |
166 | { |
167 | struct iscsi_iser_task *iser_task = task->dd_data; | |
168 | ||
169 | task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; | |
170 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
dc05ac36 | 171 | |
0f9c7449 MC |
172 | return 0; |
173 | } | |
65e7ae7b | 174 | |
7414dde0 SG |
175 | /** |
176 | * iser_initialize_task_headers() - Initialize task headers | |
177 | * @task: iscsi task | |
178 | * @tx_desc: iser tx descriptor | |
179 | * | |
180 | * Notes: | |
181 | * This routine may race with iser teardown flow for scsi | |
182 | * error handling TMFs. So for TMF we should acquire the | |
183 | * state mutex to avoid dereferencing the IB device which | |
184 | * may have already been terminated. | |
185 | */ | |
186 | int | |
187 | iser_initialize_task_headers(struct iscsi_task *task, | |
188 | struct iser_tx_desc *tx_desc) | |
f19624aa | 189 | { |
7414dde0 | 190 | struct iser_conn *iser_conn = task->conn->dd_data; |
a4ee3539 | 191 | struct iser_device *device = iser_conn->ib_conn.device; |
f19624aa OG |
192 | struct iscsi_iser_task *iser_task = task->dd_data; |
193 | u64 dma_addr; | |
7414dde0 SG |
194 | const bool mgmt_task = !task->sc && !in_interrupt(); |
195 | int ret = 0; | |
196 | ||
197 | if (unlikely(mgmt_task)) | |
198 | mutex_lock(&iser_conn->state_mutex); | |
199 | ||
200 | if (unlikely(iser_conn->state != ISER_CONN_UP)) { | |
201 | ret = -ENODEV; | |
202 | goto out; | |
203 | } | |
f19624aa OG |
204 | |
205 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
206 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
7414dde0 SG |
207 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) { |
208 | ret = -ENOMEM; | |
209 | goto out; | |
210 | } | |
f19624aa | 211 | |
7332bed0 | 212 | tx_desc->wr_idx = 0; |
8d5944d8 | 213 | tx_desc->mapped = true; |
f19624aa OG |
214 | tx_desc->dma_addr = dma_addr; |
215 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
216 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
256b7ad2 | 217 | tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; |
f19624aa | 218 | |
5716af6e | 219 | iser_task->iser_conn = iser_conn; |
7414dde0 SG |
220 | out: |
221 | if (unlikely(mgmt_task)) | |
222 | mutex_unlock(&iser_conn->state_mutex); | |
223 | ||
224 | return ret; | |
f19624aa | 225 | } |
dc05ac36 | 226 | |
65e7ae7b | 227 | /** |
dc05ac36 | 228 | * iscsi_iser_task_init() - Initialize iscsi-iser task |
2261ec3d | 229 | * @task: iscsi task |
65e7ae7b | 230 | * |
2261ec3d | 231 | * Initialize the task for the scsi command or mgmt command. |
dc05ac36 SG |
232 | * |
233 | * Return: Returns zero on success or -ENOMEM when failing | |
234 | * to init task headers (dma mapping error). | |
2747fdb2 | 235 | */ |
a8ac6311 | 236 | static int |
2261ec3d | 237 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 238 | { |
2261ec3d | 239 | struct iscsi_iser_task *iser_task = task->dd_data; |
7414dde0 | 240 | int ret; |
65e7ae7b | 241 | |
7414dde0 SG |
242 | ret = iser_initialize_task_headers(task, &iser_task->desc); |
243 | if (ret) { | |
244 | iser_err("Failed to init task %p, err = %d\n", | |
245 | iser_task, ret); | |
246 | return ret; | |
247 | } | |
f19624aa | 248 | |
2261ec3d | 249 | /* mgmt task */ |
f19624aa | 250 | if (!task->sc) |
2747fdb2 | 251 | return 0; |
65e7ae7b | 252 | |
2261ec3d | 253 | iser_task->command_sent = 0; |
2261ec3d | 254 | iser_task_rdma_init(iser_task); |
177e31bd SG |
255 | iser_task->sc = task->sc; |
256 | ||
a8ac6311 | 257 | return 0; |
65e7ae7b OG |
258 | } |
259 | ||
260 | /** | |
dc05ac36 | 261 | * iscsi_iser_mtask_xmit() - xmit management (immediate) task |
65e7ae7b | 262 | * @conn: iscsi connection |
2261ec3d | 263 | * @task: task management task |
65e7ae7b OG |
264 | * |
265 | * Notes: | |
266 | * The function can return -EAGAIN in which case caller must | |
267 | * call it again later, or recover. '0' return code means successful | |
268 | * xmit. | |
269 | * | |
270 | **/ | |
271 | static int | |
2261ec3d | 272 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
273 | { |
274 | int error = 0; | |
275 | ||
962b4b52 | 276 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 277 | |
2261ec3d | 278 | error = iser_send_control(conn, task); |
65e7ae7b | 279 | |
2261ec3d | 280 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
281 | * right after sending them. |
282 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
283 | * - if yes, the task is recycled at iscsi_complete_pdu |
284 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 285 | */ |
65e7ae7b OG |
286 | return error; |
287 | } | |
288 | ||
289 | static int | |
2747fdb2 | 290 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 291 | struct iscsi_task *task) |
65e7ae7b | 292 | { |
0f9c7449 MC |
293 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
294 | struct iscsi_data hdr; | |
65e7ae7b | 295 | int error = 0; |
65e7ae7b OG |
296 | |
297 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
298 | while (iscsi_task_has_unsol_data(task)) { |
299 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 300 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 301 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
302 | |
303 | /* the buffer description has been passed with the command */ | |
304 | /* Send the command */ | |
2261ec3d | 305 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 306 | if (error) { |
0f9c7449 | 307 | r2t->datasn--; |
2747fdb2 | 308 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 309 | } |
0f9c7449 | 310 | r2t->sent += r2t->data_count; |
48a237a2 | 311 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 312 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
313 | } |
314 | ||
2747fdb2 | 315 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
316 | return error; |
317 | } | |
318 | ||
dc05ac36 SG |
319 | /** |
320 | * iscsi_iser_task_xmit() - xmit iscsi-iser task | |
321 | * @task: iscsi task | |
322 | * | |
323 | * Return: zero on success or escalates $error on failure. | |
324 | */ | |
65e7ae7b | 325 | static int |
2261ec3d | 326 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 327 | { |
2261ec3d MC |
328 | struct iscsi_conn *conn = task->conn; |
329 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
330 | int error = 0; |
331 | ||
2261ec3d MC |
332 | if (!task->sc) |
333 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 334 | |
2261ec3d MC |
335 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
336 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 337 | |
48a237a2 | 338 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 339 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 340 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
341 | } |
342 | ||
962b4b52 | 343 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 344 | conn->id, task->itt); |
65e7ae7b | 345 | |
65e7ae7b | 346 | /* Send the cmd PDU */ |
2261ec3d MC |
347 | if (!iser_task->command_sent) { |
348 | error = iser_send_command(conn, task); | |
65e7ae7b | 349 | if (error) |
2747fdb2 | 350 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 351 | iser_task->command_sent = 1; |
65e7ae7b OG |
352 | } |
353 | ||
354 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 355 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 356 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 357 | |
2747fdb2 | 358 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
359 | return error; |
360 | } | |
361 | ||
dc05ac36 SG |
362 | /** |
363 | * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task | |
364 | * @task: iscsi task | |
365 | * | |
366 | * Notes: In case the RDMA device is already NULL (might have | |
367 | * been removed in DEVICE_REMOVAL CM event it will bail-out | |
368 | * without doing dma unmapping. | |
369 | */ | |
0f9c7449 | 370 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 371 | { |
2261ec3d | 372 | struct iscsi_iser_task *iser_task = task->dd_data; |
8d5944d8 SG |
373 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
374 | struct iser_conn *iser_conn = task->conn->dd_data; | |
a4ee3539 | 375 | struct iser_device *device = iser_conn->ib_conn.device; |
52439540 | 376 | |
3a940daf SG |
377 | /* DEVICE_REMOVAL event might have already released the device */ |
378 | if (!device) | |
379 | return; | |
380 | ||
8d5944d8 SG |
381 | if (likely(tx_desc->mapped)) { |
382 | ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, | |
383 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
384 | tx_desc->mapped = false; | |
385 | } | |
65e7ae7b | 386 | |
b3cd5050 MC |
387 | /* mgmt tasks do not need special cleanup */ |
388 | if (!task->sc) | |
2747fdb2 | 389 | return; |
65e7ae7b | 390 | |
2261ec3d MC |
391 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
392 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
393 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 394 | } |
65e7ae7b OG |
395 | } |
396 | ||
dc05ac36 SG |
397 | /** |
398 | * iscsi_iser_check_protection() - check protection information status of task. | |
399 | * @task: iscsi task | |
400 | * @sector: error sector if exsists (output) | |
401 | * | |
402 | * Return: zero if no data-integrity errors have occured | |
403 | * 0x1: data-integrity error occured in the guard-block | |
404 | * 0x2: data-integrity error occured in the reference tag | |
405 | * 0x3: data-integrity error occured in the application tag | |
406 | * | |
407 | * In addition the error sector is marked. | |
408 | */ | |
409 | static u8 | |
410 | iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) | |
0a7a08ad SG |
411 | { |
412 | struct iscsi_iser_task *iser_task = task->dd_data; | |
413 | ||
414 | if (iser_task->dir[ISER_DIR_IN]) | |
415 | return iser_check_task_pi_status(iser_task, ISER_DIR_IN, | |
416 | sector); | |
417 | else | |
418 | return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, | |
419 | sector); | |
420 | } | |
421 | ||
dc05ac36 SG |
422 | /** |
423 | * iscsi_iser_conn_create() - create a new iscsi-iser connection | |
424 | * @cls_session: iscsi class connection | |
425 | * @conn_idx: connection index within the session (for MCS) | |
426 | * | |
427 | * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL | |
428 | * otherwise. | |
429 | */ | |
65e7ae7b | 430 | static struct iscsi_cls_conn * |
dc05ac36 SG |
431 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, |
432 | uint32_t conn_idx) | |
65e7ae7b OG |
433 | { |
434 | struct iscsi_conn *conn; | |
435 | struct iscsi_cls_conn *cls_conn; | |
65e7ae7b | 436 | |
4667f5df | 437 | cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); |
65e7ae7b OG |
438 | if (!cls_conn) |
439 | return NULL; | |
440 | conn = cls_conn->dd_data; | |
441 | ||
442 | /* | |
443 | * due to issues with the login code re iser sematics | |
444 | * this not set in iscsi_conn_setup - FIXME | |
445 | */ | |
bcc60c38 | 446 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 447 | |
65e7ae7b | 448 | return cls_conn; |
65e7ae7b OG |
449 | } |
450 | ||
dc05ac36 SG |
451 | /** |
452 | * iscsi_iser_conn_bind() - bind iscsi and iser connection structures | |
453 | * @cls_session: iscsi class session | |
454 | * @cls_conn: iscsi class connection | |
455 | * @transport_eph: transport end-point handle | |
456 | * @is_leading: indicate if this is the session leading connection (MCS) | |
457 | * | |
458 | * Return: zero on success, $error if iscsi_conn_bind fails and | |
459 | * -EINVAL in case end-point doesn't exsits anymore or iser connection | |
460 | * state is not UP (teardown already started). | |
461 | */ | |
65e7ae7b OG |
462 | static int |
463 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
dc05ac36 SG |
464 | struct iscsi_cls_conn *cls_conn, |
465 | uint64_t transport_eph, | |
65e7ae7b OG |
466 | int is_leading) |
467 | { | |
468 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 469 | struct iser_conn *iser_conn; |
412eeafa | 470 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
471 | int error; |
472 | ||
473 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
474 | if (error) | |
475 | return error; | |
476 | ||
477 | /* the transport ep handle comes from user space so it must be | |
478 | * verified against the global ib connections list */ | |
412eeafa MC |
479 | ep = iscsi_lookup_endpoint(transport_eph); |
480 | if (!ep) { | |
65e7ae7b OG |
481 | iser_err("can't bind eph %llx\n", |
482 | (unsigned long long)transport_eph); | |
483 | return -EINVAL; | |
484 | } | |
5716af6e | 485 | iser_conn = ep->dd_data; |
412eeafa | 486 | |
5716af6e SG |
487 | mutex_lock(&iser_conn->state_mutex); |
488 | if (iser_conn->state != ISER_CONN_UP) { | |
91eb1df3 SG |
489 | error = -EINVAL; |
490 | iser_err("iser_conn %p state is %d, teardown started\n", | |
5716af6e | 491 | iser_conn, iser_conn->state); |
91eb1df3 SG |
492 | goto out; |
493 | } | |
494 | ||
5716af6e | 495 | error = iser_alloc_rx_descriptors(iser_conn, conn->session); |
91eb1df3 SG |
496 | if (error) |
497 | goto out; | |
89e984e2 | 498 | |
65e7ae7b OG |
499 | /* binds the iSER connection retrieved from the previously |
500 | * connected ep_handle to the iSCSI layer connection. exchanges | |
501 | * connection pointers */ | |
5716af6e | 502 | iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); |
4667f5df | 503 | |
5716af6e SG |
504 | conn->dd_data = iser_conn; |
505 | iser_conn->iscsi_conn = conn; | |
4667f5df | 506 | |
91eb1df3 | 507 | out: |
5716af6e | 508 | mutex_unlock(&iser_conn->state_mutex); |
91eb1df3 | 509 | return error; |
65e7ae7b | 510 | } |
65e7ae7b | 511 | |
dc05ac36 SG |
512 | /** |
513 | * iscsi_iser_conn_start() - start iscsi-iser connection | |
514 | * @cls_conn: iscsi class connection | |
515 | * | |
516 | * Notes: Here iser intialize (or re-initialize) stop_completion as | |
517 | * from this point iscsi must call conn_stop in session/connection | |
518 | * teardown so iser transport must wait for it. | |
519 | */ | |
b73c3ada AN |
520 | static int |
521 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
522 | { | |
523 | struct iscsi_conn *iscsi_conn; | |
5716af6e | 524 | struct iser_conn *iser_conn; |
b73c3ada AN |
525 | |
526 | iscsi_conn = cls_conn->dd_data; | |
5716af6e SG |
527 | iser_conn = iscsi_conn->dd_data; |
528 | reinit_completion(&iser_conn->stop_completion); | |
b73c3ada AN |
529 | |
530 | return iscsi_conn_start(cls_conn); | |
531 | } | |
532 | ||
dc05ac36 SG |
533 | /** |
534 | * iscsi_iser_conn_stop() - stop iscsi-iser connection | |
535 | * @cls_conn: iscsi class connection | |
536 | * @flag: indicate if recover or terminate (passed as is) | |
537 | * | |
538 | * Notes: Calling iscsi_conn_stop might theoretically race with | |
539 | * DEVICE_REMOVAL event and dereference a previously freed RDMA device | |
540 | * handle, so we call it under iser the state lock to protect against | |
541 | * this kind of race. | |
542 | */ | |
b40977d9 MC |
543 | static void |
544 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
545 | { | |
546 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 547 | struct iser_conn *iser_conn = conn->dd_data; |
65e7ae7b | 548 | |
bba0a3c9 | 549 | iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); |
b73c3ada | 550 | |
b40977d9 | 551 | /* |
913e5bf4 MC |
552 | * Userspace may have goofed up and not bound the connection or |
553 | * might have only partially setup the connection. | |
b40977d9 | 554 | */ |
5716af6e | 555 | if (iser_conn) { |
ec370e2b AN |
556 | mutex_lock(&iser_conn->state_mutex); |
557 | iser_conn_terminate(iser_conn); | |
f0caef6d | 558 | iscsi_conn_stop(cls_conn, flag); |
ec370e2b AN |
559 | |
560 | /* unbind */ | |
561 | iser_conn->iscsi_conn = NULL; | |
b73c3ada | 562 | conn->dd_data = NULL; |
ec370e2b | 563 | |
5716af6e | 564 | complete(&iser_conn->stop_completion); |
ec370e2b | 565 | mutex_unlock(&iser_conn->state_mutex); |
3a940daf SG |
566 | } else { |
567 | iscsi_conn_stop(cls_conn, flag); | |
913e5bf4 | 568 | } |
65e7ae7b OG |
569 | } |
570 | ||
dc05ac36 SG |
571 | /** |
572 | * iscsi_iser_session_destroy() - destroy iscsi-iser session | |
573 | * @cls_session: iscsi class session | |
574 | * | |
575 | * Removes and free iscsi host. | |
576 | */ | |
577 | static void | |
578 | iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) | |
75613521 MC |
579 | { |
580 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
581 | ||
e5bd7b54 | 582 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
583 | iscsi_host_remove(shost); |
584 | iscsi_host_free(shost); | |
75613521 | 585 | } |
65e7ae7b | 586 | |
6192d4e6 SG |
587 | static inline unsigned int |
588 | iser_dif_prot_caps(int prot_caps) | |
589 | { | |
5bb6e543 SG |
590 | return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? |
591 | SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | | |
592 | SHOST_DIX_TYPE1_PROTECTION : 0) | | |
593 | ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? | |
594 | SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | | |
595 | ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? | |
596 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); | |
6192d4e6 SG |
597 | } |
598 | ||
dc05ac36 SG |
599 | /** |
600 | * iscsi_iser_session_create() - create an iscsi-iser session | |
601 | * @ep: iscsi end-point handle | |
602 | * @cmds_max: maximum commands in this session | |
603 | * @qdepth: session command queue depth | |
604 | * @initial_cmdsn: initiator command sequnce number | |
605 | * | |
606 | * Allocates and adds a scsi host, expose DIF supprot if | |
607 | * exists, and sets up an iscsi session. | |
608 | */ | |
65e7ae7b | 609 | static struct iscsi_cls_session * |
412eeafa | 610 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 611 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 612 | uint32_t initial_cmdsn) |
65e7ae7b OG |
613 | { |
614 | struct iscsi_cls_session *cls_session; | |
615 | struct iscsi_session *session; | |
412eeafa | 616 | struct Scsi_Host *shost; |
5716af6e | 617 | struct iser_conn *iser_conn = NULL; |
a4ee3539 | 618 | struct ib_conn *ib_conn; |
f4641ef7 | 619 | u16 max_cmds; |
75613521 | 620 | |
962b4b52 | 621 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
622 | if (!shost) |
623 | return NULL; | |
624 | shost->transportt = iscsi_iser_scsi_transport; | |
b7f04513 | 625 | shost->cmd_per_lun = qdepth; |
75613521 MC |
626 | shost->max_lun = iscsi_max_lun; |
627 | shost->max_id = 0; | |
628 | shost->max_channel = 0; | |
629 | shost->max_cmd_len = 16; | |
630 | ||
412eeafa MC |
631 | /* |
632 | * older userspace tools (before 2.0-870) did not pass us | |
633 | * the leading conn's ep so this will be NULL; | |
634 | */ | |
6192d4e6 | 635 | if (ep) { |
5716af6e | 636 | iser_conn = ep->dd_data; |
f4641ef7 | 637 | max_cmds = iser_conn->max_cmds; |
df749cdc SG |
638 | shost->sg_tablesize = iser_conn->scsi_sg_tablesize; |
639 | shost->max_sectors = iser_conn->scsi_max_sectors; | |
3f562a0b AN |
640 | |
641 | mutex_lock(&iser_conn->state_mutex); | |
642 | if (iser_conn->state != ISER_CONN_UP) { | |
643 | iser_err("iser conn %p already started teardown\n", | |
644 | iser_conn); | |
645 | mutex_unlock(&iser_conn->state_mutex); | |
646 | goto free_host; | |
647 | } | |
648 | ||
a4ee3539 SG |
649 | ib_conn = &iser_conn->ib_conn; |
650 | if (ib_conn->pi_support) { | |
651 | u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap; | |
6192d4e6 SG |
652 | |
653 | scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); | |
5bb6e543 SG |
654 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | |
655 | SHOST_DIX_GUARD_CRC); | |
6192d4e6 | 656 | } |
3f562a0b | 657 | |
7854550a SW |
658 | /* |
659 | * Limit the sg_tablesize and max_sectors based on the device | |
660 | * max fastreg page list length. | |
661 | */ | |
662 | shost->sg_tablesize = min_t(unsigned short, shost->sg_tablesize, | |
663 | ib_conn->device->dev_attr.max_fast_reg_page_list_len); | |
664 | shost->max_sectors = min_t(unsigned int, | |
665 | 1024, (shost->sg_tablesize * PAGE_SIZE) >> 9); | |
666 | ||
3f562a0b AN |
667 | if (iscsi_host_add(shost, |
668 | ib_conn->device->ib_device->dma_device)) { | |
669 | mutex_unlock(&iser_conn->state_mutex); | |
670 | goto free_host; | |
671 | } | |
672 | mutex_unlock(&iser_conn->state_mutex); | |
f4641ef7 MT |
673 | } else { |
674 | max_cmds = ISER_DEF_XMIT_CMDS_MAX; | |
3f562a0b AN |
675 | if (iscsi_host_add(shost, NULL)) |
676 | goto free_host; | |
6192d4e6 | 677 | } |
412eeafa | 678 | |
f4641ef7 | 679 | if (cmds_max > max_cmds) { |
b7f04513 | 680 | iser_info("cmds_max changed from %u to %u\n", |
f4641ef7 MT |
681 | cmds_max, max_cmds); |
682 | cmds_max = max_cmds; | |
b7f04513 SP |
683 | } |
684 | ||
75613521 | 685 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b7f04513 | 686 | cmds_max, 0, |
2261ec3d | 687 | sizeof(struct iscsi_iser_task), |
7970634b | 688 | initial_cmdsn, 0); |
65e7ae7b | 689 | if (!cls_session) |
75613521 MC |
690 | goto remove_host; |
691 | session = cls_session->dd_data; | |
65e7ae7b | 692 | |
2747fdb2 | 693 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 694 | return cls_session; |
75613521 MC |
695 | |
696 | remove_host: | |
a4804cd6 | 697 | iscsi_host_remove(shost); |
75613521 | 698 | free_host: |
a4804cd6 | 699 | iscsi_host_free(shost); |
75613521 | 700 | return NULL; |
65e7ae7b OG |
701 | } |
702 | ||
703 | static int | |
358ff019 MC |
704 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
705 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 706 | { |
358ff019 | 707 | int value; |
65e7ae7b OG |
708 | |
709 | switch (param) { | |
710 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
711 | /* TBD */ | |
712 | break; | |
65e7ae7b | 713 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 714 | sscanf(buf, "%d", &value); |
65e7ae7b | 715 | if (value) { |
e7eeffa4 | 716 | iser_err("DataDigest wasn't negotiated to None\n"); |
65e7ae7b OG |
717 | return -EPROTO; |
718 | } | |
719 | break; | |
720 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 721 | sscanf(buf, "%d", &value); |
65e7ae7b | 722 | if (value) { |
e7eeffa4 | 723 | iser_err("DataDigest wasn't negotiated to None\n"); |
65e7ae7b OG |
724 | return -EPROTO; |
725 | } | |
726 | break; | |
65e7ae7b | 727 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 728 | sscanf(buf, "%d", &value); |
65e7ae7b | 729 | if (value) { |
e7eeffa4 | 730 | iser_err("IFMarker wasn't negotiated to No\n"); |
65e7ae7b OG |
731 | return -EPROTO; |
732 | } | |
733 | break; | |
734 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 735 | sscanf(buf, "%d", &value); |
65e7ae7b | 736 | if (value) { |
e7eeffa4 | 737 | iser_err("OFMarker wasn't negotiated to No\n"); |
65e7ae7b OG |
738 | return -EPROTO; |
739 | } | |
740 | break; | |
741 | default: | |
358ff019 | 742 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
743 | } |
744 | ||
745 | return 0; | |
746 | } | |
747 | ||
dc05ac36 SG |
748 | /** |
749 | * iscsi_iser_set_param() - set class connection parameter | |
750 | * @cls_conn: iscsi class connection | |
751 | * @stats: iscsi stats to output | |
752 | * | |
753 | * Output connection statistics. | |
754 | */ | |
65e7ae7b OG |
755 | static void |
756 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
757 | { | |
758 | struct iscsi_conn *conn = cls_conn->dd_data; | |
759 | ||
760 | stats->txdata_octets = conn->txdata_octets; | |
761 | stats->rxdata_octets = conn->rxdata_octets; | |
762 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
763 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
764 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
765 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
766 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
767 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
768 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
02816a8b SG |
769 | stats->custom_length = 1; |
770 | strcpy(stats->custom[0].desc, "fmr_unalign_cnt"); | |
771 | stats->custom[0].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
772 | } |
773 | ||
7c53c6f8 MC |
774 | static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
775 | enum iscsi_param param, char *buf) | |
776 | { | |
5716af6e | 777 | struct iser_conn *iser_conn = ep->dd_data; |
7c53c6f8 MC |
778 | int len; |
779 | ||
780 | switch (param) { | |
781 | case ISCSI_PARAM_CONN_PORT: | |
782 | case ISCSI_PARAM_CONN_ADDRESS: | |
a4ee3539 | 783 | if (!iser_conn || !iser_conn->ib_conn.cma_id) |
7c53c6f8 MC |
784 | return -ENOTCONN; |
785 | ||
786 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
a4ee3539 SG |
787 | &iser_conn->ib_conn.cma_id->route.addr.dst_addr, |
788 | param, buf); | |
7c53c6f8 MC |
789 | break; |
790 | default: | |
791 | return -ENOSYS; | |
792 | } | |
793 | ||
794 | return len; | |
795 | } | |
796 | ||
dc05ac36 SG |
797 | /** |
798 | * iscsi_iser_ep_connect() - Initiate iSER connection establishment | |
799 | * @shost: scsi_host | |
800 | * @dst_addr: destination address | |
801 | * @non-blocking: indicate if routine can block | |
802 | * | |
803 | * Allocate an iscsi endpoint, an iser_conn structure and bind them. | |
804 | * After that start RDMA connection establishment via rdma_cm. We | |
805 | * don't allocate iser_conn embedded in iscsi_endpoint since in teardown | |
806 | * the endpoint will be destroyed at ep_disconnect while iser_conn will | |
807 | * cleanup its resources asynchronuously. | |
808 | * | |
809 | * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) | |
810 | * if fails. | |
811 | */ | |
412eeafa | 812 | static struct iscsi_endpoint * |
10eb0f01 MC |
813 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
814 | int non_blocking) | |
65e7ae7b OG |
815 | { |
816 | int err; | |
5716af6e | 817 | struct iser_conn *iser_conn; |
412eeafa | 818 | struct iscsi_endpoint *ep; |
65e7ae7b | 819 | |
0a690758 | 820 | ep = iscsi_create_endpoint(0); |
412eeafa MC |
821 | if (!ep) |
822 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 823 | |
5716af6e SG |
824 | iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
825 | if (!iser_conn) { | |
0a690758 AN |
826 | err = -ENOMEM; |
827 | goto failure; | |
828 | } | |
829 | ||
5716af6e SG |
830 | ep->dd_data = iser_conn; |
831 | iser_conn->ep = ep; | |
832 | iser_conn_init(iser_conn); | |
65e7ae7b | 833 | |
5716af6e | 834 | err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); |
7d9c0de4 | 835 | if (err) |
0a690758 | 836 | goto failure; |
7d9c0de4 | 837 | |
412eeafa | 838 | return ep; |
0a690758 AN |
839 | failure: |
840 | iscsi_destroy_endpoint(ep); | |
841 | return ERR_PTR(err); | |
65e7ae7b OG |
842 | } |
843 | ||
dc05ac36 SG |
844 | /** |
845 | * iscsi_iser_ep_poll() - poll for iser connection establishment to complete | |
846 | * @ep: iscsi endpoint (created at ep_connect) | |
847 | * @timeout_ms: polling timeout allowed in ms. | |
848 | * | |
849 | * This routine boils down to waiting for up_completion signaling | |
850 | * that cma_id got CONNECTED event. | |
851 | * | |
852 | * Return: 1 if succeeded in connection establishment, 0 if timeout expired | |
853 | * (libiscsi will retry will kick in) or -1 if interrupted by signal | |
854 | * or more likely iser connection state transitioned to TEMINATING or | |
855 | * DOWN during the wait period. | |
856 | */ | |
65e7ae7b | 857 | static int |
412eeafa | 858 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 859 | { |
74ce897b | 860 | struct iser_conn *iser_conn = ep->dd_data; |
65e7ae7b OG |
861 | int rc; |
862 | ||
5716af6e | 863 | rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, |
9a6d3234 | 864 | msecs_to_jiffies(timeout_ms)); |
65e7ae7b | 865 | /* if conn establishment failed, return error code to iscsi */ |
504130c0 | 866 | if (rc == 0) { |
5716af6e SG |
867 | mutex_lock(&iser_conn->state_mutex); |
868 | if (iser_conn->state == ISER_CONN_TERMINATING || | |
869 | iser_conn->state == ISER_CONN_DOWN) | |
504130c0 | 870 | rc = -1; |
5716af6e | 871 | mutex_unlock(&iser_conn->state_mutex); |
504130c0 | 872 | } |
65e7ae7b | 873 | |
74ce897b | 874 | iser_info("iser conn %p rc = %d\n", iser_conn, rc); |
65e7ae7b OG |
875 | |
876 | if (rc > 0) | |
877 | return 1; /* success, this is the equivalent of POLLOUT */ | |
878 | else if (!rc) | |
879 | return 0; /* timeout */ | |
880 | else | |
881 | return rc; /* signal */ | |
882 | } | |
883 | ||
dc05ac36 SG |
884 | /** |
885 | * iscsi_iser_ep_disconnect() - Initiate connection teardown process | |
886 | * @ep: iscsi endpoint handle | |
887 | * | |
888 | * This routine is not blocked by iser and RDMA termination process | |
889 | * completion as we queue a deffered work for iser/RDMA destruction | |
890 | * and cleanup or actually call it immediately in case we didn't pass | |
891 | * iscsi conn bind/start stage, thus it is safe. | |
892 | */ | |
65e7ae7b | 893 | static void |
412eeafa | 894 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 895 | { |
74ce897b | 896 | struct iser_conn *iser_conn = ep->dd_data; |
65e7ae7b | 897 | |
74ce897b | 898 | iser_info("ep %p iser conn %p\n", ep, iser_conn); |
5716af6e SG |
899 | |
900 | mutex_lock(&iser_conn->state_mutex); | |
901 | iser_conn_terminate(iser_conn); | |
b73c3ada AN |
902 | |
903 | /* | |
9a6d3234 AN |
904 | * if iser_conn and iscsi_conn are bound, we must wait for |
905 | * iscsi_conn_stop and flush errors completion before freeing | |
906 | * the iser resources. Otherwise we are safe to free resources | |
907 | * immediately. | |
b73c3ada | 908 | */ |
5716af6e SG |
909 | if (iser_conn->iscsi_conn) { |
910 | INIT_WORK(&iser_conn->release_work, iser_release_work); | |
911 | queue_work(release_wq, &iser_conn->release_work); | |
912 | mutex_unlock(&iser_conn->state_mutex); | |
b73c3ada | 913 | } else { |
5716af6e SG |
914 | iser_conn->state = ISER_CONN_DOWN; |
915 | mutex_unlock(&iser_conn->state_mutex); | |
916 | iser_conn_release(iser_conn); | |
b73c3ada | 917 | } |
1156cc80 | 918 | |
0a690758 | 919 | iscsi_destroy_endpoint(ep); |
65e7ae7b OG |
920 | } |
921 | ||
587a1f16 | 922 | static umode_t iser_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
923 | { |
924 | switch (param_type) { | |
f27fb2ef MC |
925 | case ISCSI_HOST_PARAM: |
926 | switch (param) { | |
927 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
928 | case ISCSI_HOST_PARAM_HWADDRESS: | |
929 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
930 | return S_IRUGO; | |
931 | default: | |
932 | return 0; | |
933 | } | |
3128c6c7 MC |
934 | case ISCSI_PARAM: |
935 | switch (param) { | |
936 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
937 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
938 | case ISCSI_PARAM_HDRDGST_EN: | |
939 | case ISCSI_PARAM_DATADGST_EN: | |
940 | case ISCSI_PARAM_CONN_ADDRESS: | |
941 | case ISCSI_PARAM_CONN_PORT: | |
942 | case ISCSI_PARAM_EXP_STATSN: | |
943 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
944 | case ISCSI_PARAM_PERSISTENT_PORT: | |
945 | case ISCSI_PARAM_PING_TMO: | |
946 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
947 | case ISCSI_PARAM_INITIAL_R2T_EN: |
948 | case ISCSI_PARAM_MAX_R2T: | |
949 | case ISCSI_PARAM_IMM_DATA_EN: | |
950 | case ISCSI_PARAM_FIRST_BURST: | |
951 | case ISCSI_PARAM_MAX_BURST: | |
952 | case ISCSI_PARAM_PDU_INORDER_EN: | |
953 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
954 | case ISCSI_PARAM_TARGET_NAME: | |
955 | case ISCSI_PARAM_TPGT: | |
956 | case ISCSI_PARAM_USERNAME: | |
957 | case ISCSI_PARAM_PASSWORD: | |
958 | case ISCSI_PARAM_USERNAME_IN: | |
959 | case ISCSI_PARAM_PASSWORD_IN: | |
960 | case ISCSI_PARAM_FAST_ABORT: | |
961 | case ISCSI_PARAM_ABORT_TMO: | |
962 | case ISCSI_PARAM_LU_RESET_TMO: | |
963 | case ISCSI_PARAM_TGT_RESET_TMO: | |
964 | case ISCSI_PARAM_IFACE_NAME: | |
965 | case ISCSI_PARAM_INITIATOR_NAME: | |
6a06a4b8 | 966 | case ISCSI_PARAM_DISCOVERY_SESS: |
3128c6c7 MC |
967 | return S_IRUGO; |
968 | default: | |
969 | return 0; | |
970 | } | |
971 | } | |
972 | ||
973 | return 0; | |
974 | } | |
975 | ||
65e7ae7b | 976 | static struct scsi_host_template iscsi_iser_sht = { |
7974392c | 977 | .module = THIS_MODULE, |
c1d786e6 | 978 | .name = "iSCSI Initiator over iSER", |
65e7ae7b | 979 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 980 | .change_queue_depth = scsi_change_queue_depth, |
df749cdc SG |
981 | .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE, |
982 | .max_sectors = ISER_DEF_MAX_SECTORS, | |
e28f3d5b | 983 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 984 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 985 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 986 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 987 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
988 | .use_clustering = DISABLE_CLUSTERING, |
989 | .proc_name = "iscsi_iser", | |
990 | .this_id = -1, | |
c40ecc12 | 991 | .track_queue_depth = 1, |
65e7ae7b OG |
992 | }; |
993 | ||
994 | static struct iscsi_transport iscsi_iser_transport = { | |
995 | .owner = THIS_MODULE, | |
996 | .name = "iser", | |
6a06a4b8 | 997 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, |
65e7ae7b OG |
998 | /* session management */ |
999 | .create_session = iscsi_iser_session_create, | |
75613521 | 1000 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
1001 | /* connection management */ |
1002 | .create_conn = iscsi_iser_conn_create, | |
1003 | .bind_conn = iscsi_iser_conn_bind, | |
b73c3ada | 1004 | .destroy_conn = iscsi_conn_teardown, |
3128c6c7 | 1005 | .attr_is_visible = iser_attr_is_visible, |
358ff019 MC |
1006 | .set_param = iscsi_iser_set_param, |
1007 | .get_conn_param = iscsi_conn_get_param, | |
7c53c6f8 | 1008 | .get_ep_param = iscsi_iser_get_ep_param, |
358ff019 | 1009 | .get_session_param = iscsi_session_get_param, |
b73c3ada | 1010 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 1011 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
1012 | /* iscsi host params */ |
1013 | .get_host_param = iscsi_host_get_param, | |
1014 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
1015 | /* IO */ |
1016 | .send_pdu = iscsi_conn_send_pdu, | |
1017 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
1018 | .init_task = iscsi_iser_task_init, |
1019 | .xmit_task = iscsi_iser_task_xmit, | |
1020 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 1021 | .alloc_pdu = iscsi_iser_pdu_alloc, |
0a7a08ad | 1022 | .check_protection = iscsi_iser_check_protection, |
65e7ae7b OG |
1023 | /* recovery */ |
1024 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
1025 | ||
1026 | .ep_connect = iscsi_iser_ep_connect, | |
1027 | .ep_poll = iscsi_iser_ep_poll, | |
1028 | .ep_disconnect = iscsi_iser_ep_disconnect | |
1029 | }; | |
1030 | ||
1031 | static int __init iser_init(void) | |
1032 | { | |
1033 | int err; | |
1034 | ||
1035 | iser_dbg("Starting iSER datamover...\n"); | |
1036 | ||
1037 | if (iscsi_max_lun < 1) { | |
4f363882 | 1038 | iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
65e7ae7b OG |
1039 | return -EINVAL; |
1040 | } | |
1041 | ||
65e7ae7b OG |
1042 | memset(&ig, 0, sizeof(struct iser_global)); |
1043 | ||
1044 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 1045 | sizeof(struct iser_tx_desc), |
65e7ae7b | 1046 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 1047 | NULL); |
65e7ae7b OG |
1048 | if (ig.desc_cache == NULL) |
1049 | return -ENOMEM; | |
1050 | ||
1051 | /* device init is called only after the first addr resolution */ | |
1052 | mutex_init(&ig.device_list_mutex); | |
1053 | INIT_LIST_HEAD(&ig.device_list); | |
1054 | mutex_init(&ig.connlist_mutex); | |
1055 | INIT_LIST_HEAD(&ig.connlist); | |
1056 | ||
b73c3ada AN |
1057 | release_wq = alloc_workqueue("release workqueue", 0, 0); |
1058 | if (!release_wq) { | |
1059 | iser_err("failed to allocate release workqueue\n"); | |
1060 | return -ENOMEM; | |
1061 | } | |
1062 | ||
75613521 MC |
1063 | iscsi_iser_scsi_transport = iscsi_register_transport( |
1064 | &iscsi_iser_transport); | |
1065 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
1066 | iser_err("iscsi_register_transport failed\n"); |
1067 | err = -EINVAL; | |
1068 | goto register_transport_failure; | |
1069 | } | |
1070 | ||
1071 | return 0; | |
1072 | ||
1073 | register_transport_failure: | |
1074 | kmem_cache_destroy(ig.desc_cache); | |
1075 | ||
1076 | return err; | |
1077 | } | |
1078 | ||
1079 | static void __exit iser_exit(void) | |
1080 | { | |
5716af6e | 1081 | struct iser_conn *iser_conn, *n; |
b73c3ada AN |
1082 | int connlist_empty; |
1083 | ||
65e7ae7b | 1084 | iser_dbg("Removing iSER datamover...\n"); |
b73c3ada AN |
1085 | destroy_workqueue(release_wq); |
1086 | ||
1087 | mutex_lock(&ig.connlist_mutex); | |
1088 | connlist_empty = list_empty(&ig.connlist); | |
1089 | mutex_unlock(&ig.connlist_mutex); | |
1090 | ||
1091 | if (!connlist_empty) { | |
1092 | iser_err("Error cleanup stage completed but we still have iser " | |
1156cc80 | 1093 | "connections, destroying them anyway\n"); |
5716af6e SG |
1094 | list_for_each_entry_safe(iser_conn, n, &ig.connlist, |
1095 | conn_list) { | |
1096 | iser_conn_release(iser_conn); | |
b73c3ada AN |
1097 | } |
1098 | } | |
1099 | ||
65e7ae7b OG |
1100 | iscsi_unregister_transport(&iscsi_iser_transport); |
1101 | kmem_cache_destroy(ig.desc_cache); | |
1102 | } | |
1103 | ||
1104 | module_init(iser_init); | |
1105 | module_exit(iser_exit); |