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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 | ||
7c0f6ba6 | 65 | #include <linux/uaccess.h> |
65e7ae7b OG |
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 | 113 | /* |
68a5e604 | 114 | * iscsi_iser_recv() - Process a successful recv completion |
dc05ac36 SG |
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 | 128 | int datalen; |
65e7ae7b OG |
129 | |
130 | /* verify PDU length */ | |
131 | datalen = ntoh24(hdr->dlength); | |
200ae1a0 OG |
132 | if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { |
133 | iser_err("wrong datalen %d (hdr), %d (IB)\n", | |
134 | datalen, rx_data_len); | |
65e7ae7b OG |
135 | rc = ISCSI_ERR_DATALEN; |
136 | goto error; | |
137 | } | |
138 | ||
200ae1a0 OG |
139 | if (datalen != rx_data_len) |
140 | iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", | |
141 | datalen, rx_data_len); | |
142 | ||
0af967f5 | 143 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
144 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
145 | goto error; | |
146 | ||
147 | return; | |
148 | error: | |
149 | iscsi_conn_failure(conn, rc); | |
150 | } | |
151 | ||
dc05ac36 SG |
152 | /** |
153 | * iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU | |
154 | * @task: iscsi task | |
155 | * @opcode: iscsi command opcode | |
156 | * | |
157 | * Netes: This routine can't fail, just assign iscsi task | |
158 | * hdr and max hdr size. | |
159 | */ | |
160 | static int | |
161 | iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) | |
0f9c7449 MC |
162 | { |
163 | struct iscsi_iser_task *iser_task = task->dd_data; | |
164 | ||
165 | task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; | |
166 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
dc05ac36 | 167 | |
0f9c7449 MC |
168 | return 0; |
169 | } | |
65e7ae7b | 170 | |
7414dde0 SG |
171 | /** |
172 | * iser_initialize_task_headers() - Initialize task headers | |
173 | * @task: iscsi task | |
174 | * @tx_desc: iser tx descriptor | |
175 | * | |
176 | * Notes: | |
177 | * This routine may race with iser teardown flow for scsi | |
178 | * error handling TMFs. So for TMF we should acquire the | |
179 | * state mutex to avoid dereferencing the IB device which | |
180 | * may have already been terminated. | |
181 | */ | |
182 | int | |
183 | iser_initialize_task_headers(struct iscsi_task *task, | |
184 | struct iser_tx_desc *tx_desc) | |
f19624aa | 185 | { |
7414dde0 | 186 | struct iser_conn *iser_conn = task->conn->dd_data; |
a4ee3539 | 187 | struct iser_device *device = iser_conn->ib_conn.device; |
f19624aa OG |
188 | struct iscsi_iser_task *iser_task = task->dd_data; |
189 | u64 dma_addr; | |
7414dde0 SG |
190 | const bool mgmt_task = !task->sc && !in_interrupt(); |
191 | int ret = 0; | |
192 | ||
193 | if (unlikely(mgmt_task)) | |
194 | mutex_lock(&iser_conn->state_mutex); | |
195 | ||
196 | if (unlikely(iser_conn->state != ISER_CONN_UP)) { | |
197 | ret = -ENODEV; | |
198 | goto out; | |
199 | } | |
f19624aa OG |
200 | |
201 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
202 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
7414dde0 SG |
203 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) { |
204 | ret = -ENOMEM; | |
205 | goto out; | |
206 | } | |
f19624aa | 207 | |
7332bed0 | 208 | tx_desc->wr_idx = 0; |
8d5944d8 | 209 | tx_desc->mapped = true; |
f19624aa OG |
210 | tx_desc->dma_addr = dma_addr; |
211 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
212 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
256b7ad2 | 213 | tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; |
f19624aa | 214 | |
5716af6e | 215 | iser_task->iser_conn = iser_conn; |
7414dde0 SG |
216 | out: |
217 | if (unlikely(mgmt_task)) | |
218 | mutex_unlock(&iser_conn->state_mutex); | |
219 | ||
220 | return ret; | |
f19624aa | 221 | } |
dc05ac36 | 222 | |
65e7ae7b | 223 | /** |
dc05ac36 | 224 | * iscsi_iser_task_init() - Initialize iscsi-iser task |
2261ec3d | 225 | * @task: iscsi task |
65e7ae7b | 226 | * |
2261ec3d | 227 | * Initialize the task for the scsi command or mgmt command. |
dc05ac36 SG |
228 | * |
229 | * Return: Returns zero on success or -ENOMEM when failing | |
230 | * to init task headers (dma mapping error). | |
2747fdb2 | 231 | */ |
a8ac6311 | 232 | static int |
2261ec3d | 233 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 234 | { |
2261ec3d | 235 | struct iscsi_iser_task *iser_task = task->dd_data; |
7414dde0 | 236 | int ret; |
65e7ae7b | 237 | |
7414dde0 SG |
238 | ret = iser_initialize_task_headers(task, &iser_task->desc); |
239 | if (ret) { | |
240 | iser_err("Failed to init task %p, err = %d\n", | |
241 | iser_task, ret); | |
242 | return ret; | |
243 | } | |
f19624aa | 244 | |
2261ec3d | 245 | /* mgmt task */ |
f19624aa | 246 | if (!task->sc) |
2747fdb2 | 247 | return 0; |
65e7ae7b | 248 | |
2261ec3d | 249 | iser_task->command_sent = 0; |
2261ec3d | 250 | iser_task_rdma_init(iser_task); |
177e31bd SG |
251 | iser_task->sc = task->sc; |
252 | ||
a8ac6311 | 253 | return 0; |
65e7ae7b OG |
254 | } |
255 | ||
256 | /** | |
dc05ac36 | 257 | * iscsi_iser_mtask_xmit() - xmit management (immediate) task |
65e7ae7b | 258 | * @conn: iscsi connection |
2261ec3d | 259 | * @task: task management task |
65e7ae7b OG |
260 | * |
261 | * Notes: | |
262 | * The function can return -EAGAIN in which case caller must | |
263 | * call it again later, or recover. '0' return code means successful | |
264 | * xmit. | |
265 | * | |
266 | **/ | |
267 | static int | |
2261ec3d | 268 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
269 | { |
270 | int error = 0; | |
271 | ||
962b4b52 | 272 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 273 | |
2261ec3d | 274 | error = iser_send_control(conn, task); |
65e7ae7b | 275 | |
2261ec3d | 276 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
277 | * right after sending them. |
278 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
279 | * - if yes, the task is recycled at iscsi_complete_pdu |
280 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 281 | */ |
65e7ae7b OG |
282 | return error; |
283 | } | |
284 | ||
285 | static int | |
2747fdb2 | 286 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 287 | struct iscsi_task *task) |
65e7ae7b | 288 | { |
0f9c7449 MC |
289 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
290 | struct iscsi_data hdr; | |
65e7ae7b | 291 | int error = 0; |
65e7ae7b OG |
292 | |
293 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
294 | while (iscsi_task_has_unsol_data(task)) { |
295 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 296 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 297 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
298 | |
299 | /* the buffer description has been passed with the command */ | |
300 | /* Send the command */ | |
2261ec3d | 301 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 302 | if (error) { |
0f9c7449 | 303 | r2t->datasn--; |
2747fdb2 | 304 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 305 | } |
0f9c7449 | 306 | r2t->sent += r2t->data_count; |
48a237a2 | 307 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 308 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
309 | } |
310 | ||
2747fdb2 | 311 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
312 | return error; |
313 | } | |
314 | ||
dc05ac36 SG |
315 | /** |
316 | * iscsi_iser_task_xmit() - xmit iscsi-iser task | |
317 | * @task: iscsi task | |
318 | * | |
319 | * Return: zero on success or escalates $error on failure. | |
320 | */ | |
65e7ae7b | 321 | static int |
2261ec3d | 322 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 323 | { |
2261ec3d MC |
324 | struct iscsi_conn *conn = task->conn; |
325 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
326 | int error = 0; |
327 | ||
2261ec3d MC |
328 | if (!task->sc) |
329 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 330 | |
2261ec3d MC |
331 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
332 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 333 | |
48a237a2 | 334 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 335 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 336 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
337 | } |
338 | ||
962b4b52 | 339 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 340 | conn->id, task->itt); |
65e7ae7b | 341 | |
65e7ae7b | 342 | /* Send the cmd PDU */ |
2261ec3d MC |
343 | if (!iser_task->command_sent) { |
344 | error = iser_send_command(conn, task); | |
65e7ae7b | 345 | if (error) |
2747fdb2 | 346 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 347 | iser_task->command_sent = 1; |
65e7ae7b OG |
348 | } |
349 | ||
350 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 351 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 352 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 353 | |
2747fdb2 | 354 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
355 | return error; |
356 | } | |
357 | ||
dc05ac36 SG |
358 | /** |
359 | * iscsi_iser_cleanup_task() - cleanup an iscsi-iser task | |
360 | * @task: iscsi task | |
361 | * | |
362 | * Notes: In case the RDMA device is already NULL (might have | |
363 | * been removed in DEVICE_REMOVAL CM event it will bail-out | |
364 | * without doing dma unmapping. | |
365 | */ | |
0f9c7449 | 366 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 367 | { |
2261ec3d | 368 | struct iscsi_iser_task *iser_task = task->dd_data; |
8d5944d8 SG |
369 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
370 | struct iser_conn *iser_conn = task->conn->dd_data; | |
a4ee3539 | 371 | struct iser_device *device = iser_conn->ib_conn.device; |
52439540 | 372 | |
3a940daf SG |
373 | /* DEVICE_REMOVAL event might have already released the device */ |
374 | if (!device) | |
375 | return; | |
376 | ||
8d5944d8 SG |
377 | if (likely(tx_desc->mapped)) { |
378 | ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, | |
379 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
380 | tx_desc->mapped = false; | |
381 | } | |
65e7ae7b | 382 | |
b3cd5050 MC |
383 | /* mgmt tasks do not need special cleanup */ |
384 | if (!task->sc) | |
2747fdb2 | 385 | return; |
65e7ae7b | 386 | |
2261ec3d MC |
387 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
388 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
389 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 390 | } |
65e7ae7b OG |
391 | } |
392 | ||
dc05ac36 SG |
393 | /** |
394 | * iscsi_iser_check_protection() - check protection information status of task. | |
395 | * @task: iscsi task | |
396 | * @sector: error sector if exsists (output) | |
397 | * | |
398 | * Return: zero if no data-integrity errors have occured | |
399 | * 0x1: data-integrity error occured in the guard-block | |
400 | * 0x2: data-integrity error occured in the reference tag | |
401 | * 0x3: data-integrity error occured in the application tag | |
402 | * | |
403 | * In addition the error sector is marked. | |
404 | */ | |
405 | static u8 | |
406 | iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) | |
0a7a08ad SG |
407 | { |
408 | struct iscsi_iser_task *iser_task = task->dd_data; | |
409 | ||
410 | if (iser_task->dir[ISER_DIR_IN]) | |
411 | return iser_check_task_pi_status(iser_task, ISER_DIR_IN, | |
412 | sector); | |
413 | else | |
414 | return iser_check_task_pi_status(iser_task, ISER_DIR_OUT, | |
415 | sector); | |
416 | } | |
417 | ||
dc05ac36 SG |
418 | /** |
419 | * iscsi_iser_conn_create() - create a new iscsi-iser connection | |
420 | * @cls_session: iscsi class connection | |
421 | * @conn_idx: connection index within the session (for MCS) | |
422 | * | |
423 | * Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL | |
424 | * otherwise. | |
425 | */ | |
65e7ae7b | 426 | static struct iscsi_cls_conn * |
dc05ac36 SG |
427 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, |
428 | uint32_t conn_idx) | |
65e7ae7b OG |
429 | { |
430 | struct iscsi_conn *conn; | |
431 | struct iscsi_cls_conn *cls_conn; | |
65e7ae7b | 432 | |
4667f5df | 433 | cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); |
65e7ae7b OG |
434 | if (!cls_conn) |
435 | return NULL; | |
436 | conn = cls_conn->dd_data; | |
437 | ||
438 | /* | |
439 | * due to issues with the login code re iser sematics | |
440 | * this not set in iscsi_conn_setup - FIXME | |
441 | */ | |
bcc60c38 | 442 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 443 | |
65e7ae7b | 444 | return cls_conn; |
65e7ae7b OG |
445 | } |
446 | ||
dc05ac36 SG |
447 | /** |
448 | * iscsi_iser_conn_bind() - bind iscsi and iser connection structures | |
449 | * @cls_session: iscsi class session | |
450 | * @cls_conn: iscsi class connection | |
451 | * @transport_eph: transport end-point handle | |
452 | * @is_leading: indicate if this is the session leading connection (MCS) | |
453 | * | |
454 | * Return: zero on success, $error if iscsi_conn_bind fails and | |
455 | * -EINVAL in case end-point doesn't exsits anymore or iser connection | |
456 | * state is not UP (teardown already started). | |
457 | */ | |
65e7ae7b OG |
458 | static int |
459 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
dc05ac36 SG |
460 | struct iscsi_cls_conn *cls_conn, |
461 | uint64_t transport_eph, | |
65e7ae7b OG |
462 | int is_leading) |
463 | { | |
464 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 465 | struct iser_conn *iser_conn; |
412eeafa | 466 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
467 | int error; |
468 | ||
469 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
470 | if (error) | |
471 | return error; | |
472 | ||
473 | /* the transport ep handle comes from user space so it must be | |
474 | * verified against the global ib connections list */ | |
412eeafa MC |
475 | ep = iscsi_lookup_endpoint(transport_eph); |
476 | if (!ep) { | |
65e7ae7b OG |
477 | iser_err("can't bind eph %llx\n", |
478 | (unsigned long long)transport_eph); | |
479 | return -EINVAL; | |
480 | } | |
5716af6e | 481 | iser_conn = ep->dd_data; |
412eeafa | 482 | |
5716af6e SG |
483 | mutex_lock(&iser_conn->state_mutex); |
484 | if (iser_conn->state != ISER_CONN_UP) { | |
91eb1df3 SG |
485 | error = -EINVAL; |
486 | iser_err("iser_conn %p state is %d, teardown started\n", | |
5716af6e | 487 | iser_conn, iser_conn->state); |
91eb1df3 SG |
488 | goto out; |
489 | } | |
490 | ||
5716af6e | 491 | error = iser_alloc_rx_descriptors(iser_conn, conn->session); |
91eb1df3 SG |
492 | if (error) |
493 | goto out; | |
89e984e2 | 494 | |
65e7ae7b OG |
495 | /* binds the iSER connection retrieved from the previously |
496 | * connected ep_handle to the iSCSI layer connection. exchanges | |
497 | * connection pointers */ | |
5716af6e | 498 | iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); |
4667f5df | 499 | |
5716af6e SG |
500 | conn->dd_data = iser_conn; |
501 | iser_conn->iscsi_conn = conn; | |
4667f5df | 502 | |
91eb1df3 | 503 | out: |
5716af6e | 504 | mutex_unlock(&iser_conn->state_mutex); |
91eb1df3 | 505 | return error; |
65e7ae7b | 506 | } |
65e7ae7b | 507 | |
dc05ac36 SG |
508 | /** |
509 | * iscsi_iser_conn_start() - start iscsi-iser connection | |
510 | * @cls_conn: iscsi class connection | |
511 | * | |
512 | * Notes: Here iser intialize (or re-initialize) stop_completion as | |
513 | * from this point iscsi must call conn_stop in session/connection | |
514 | * teardown so iser transport must wait for it. | |
515 | */ | |
b73c3ada AN |
516 | static int |
517 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
518 | { | |
519 | struct iscsi_conn *iscsi_conn; | |
5716af6e | 520 | struct iser_conn *iser_conn; |
b73c3ada AN |
521 | |
522 | iscsi_conn = cls_conn->dd_data; | |
5716af6e SG |
523 | iser_conn = iscsi_conn->dd_data; |
524 | reinit_completion(&iser_conn->stop_completion); | |
b73c3ada AN |
525 | |
526 | return iscsi_conn_start(cls_conn); | |
527 | } | |
528 | ||
dc05ac36 SG |
529 | /** |
530 | * iscsi_iser_conn_stop() - stop iscsi-iser connection | |
531 | * @cls_conn: iscsi class connection | |
532 | * @flag: indicate if recover or terminate (passed as is) | |
533 | * | |
534 | * Notes: Calling iscsi_conn_stop might theoretically race with | |
535 | * DEVICE_REMOVAL event and dereference a previously freed RDMA device | |
536 | * handle, so we call it under iser the state lock to protect against | |
537 | * this kind of race. | |
538 | */ | |
b40977d9 MC |
539 | static void |
540 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
541 | { | |
542 | struct iscsi_conn *conn = cls_conn->dd_data; | |
5716af6e | 543 | struct iser_conn *iser_conn = conn->dd_data; |
65e7ae7b | 544 | |
bba0a3c9 | 545 | iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); |
b73c3ada | 546 | |
b40977d9 | 547 | /* |
913e5bf4 MC |
548 | * Userspace may have goofed up and not bound the connection or |
549 | * might have only partially setup the connection. | |
b40977d9 | 550 | */ |
5716af6e | 551 | if (iser_conn) { |
ec370e2b AN |
552 | mutex_lock(&iser_conn->state_mutex); |
553 | iser_conn_terminate(iser_conn); | |
f0caef6d | 554 | iscsi_conn_stop(cls_conn, flag); |
ec370e2b AN |
555 | |
556 | /* unbind */ | |
557 | iser_conn->iscsi_conn = NULL; | |
b73c3ada | 558 | conn->dd_data = NULL; |
ec370e2b | 559 | |
5716af6e | 560 | complete(&iser_conn->stop_completion); |
ec370e2b | 561 | mutex_unlock(&iser_conn->state_mutex); |
3a940daf SG |
562 | } else { |
563 | iscsi_conn_stop(cls_conn, flag); | |
913e5bf4 | 564 | } |
65e7ae7b OG |
565 | } |
566 | ||
dc05ac36 SG |
567 | /** |
568 | * iscsi_iser_session_destroy() - destroy iscsi-iser session | |
569 | * @cls_session: iscsi class session | |
570 | * | |
571 | * Removes and free iscsi host. | |
572 | */ | |
573 | static void | |
574 | iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) | |
75613521 MC |
575 | { |
576 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
577 | ||
e5bd7b54 | 578 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
579 | iscsi_host_remove(shost); |
580 | iscsi_host_free(shost); | |
75613521 | 581 | } |
65e7ae7b | 582 | |
6192d4e6 SG |
583 | static inline unsigned int |
584 | iser_dif_prot_caps(int prot_caps) | |
585 | { | |
5bb6e543 SG |
586 | return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? |
587 | SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION | | |
588 | SHOST_DIX_TYPE1_PROTECTION : 0) | | |
589 | ((prot_caps & IB_PROT_T10DIF_TYPE_2) ? | |
590 | SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) | | |
591 | ((prot_caps & IB_PROT_T10DIF_TYPE_3) ? | |
592 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0); | |
6192d4e6 SG |
593 | } |
594 | ||
dc05ac36 SG |
595 | /** |
596 | * iscsi_iser_session_create() - create an iscsi-iser session | |
597 | * @ep: iscsi end-point handle | |
598 | * @cmds_max: maximum commands in this session | |
599 | * @qdepth: session command queue depth | |
600 | * @initial_cmdsn: initiator command sequnce number | |
601 | * | |
602 | * Allocates and adds a scsi host, expose DIF supprot if | |
603 | * exists, and sets up an iscsi session. | |
604 | */ | |
65e7ae7b | 605 | static struct iscsi_cls_session * |
412eeafa | 606 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 607 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 608 | uint32_t initial_cmdsn) |
65e7ae7b OG |
609 | { |
610 | struct iscsi_cls_session *cls_session; | |
611 | struct iscsi_session *session; | |
412eeafa | 612 | struct Scsi_Host *shost; |
5716af6e | 613 | struct iser_conn *iser_conn = NULL; |
a4ee3539 | 614 | struct ib_conn *ib_conn; |
9c674815 | 615 | u32 max_fr_sectors; |
f4641ef7 | 616 | u16 max_cmds; |
75613521 | 617 | |
962b4b52 | 618 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
619 | if (!shost) |
620 | return NULL; | |
621 | shost->transportt = iscsi_iser_scsi_transport; | |
b7f04513 | 622 | shost->cmd_per_lun = qdepth; |
75613521 MC |
623 | shost->max_lun = iscsi_max_lun; |
624 | shost->max_id = 0; | |
625 | shost->max_channel = 0; | |
626 | shost->max_cmd_len = 16; | |
627 | ||
412eeafa MC |
628 | /* |
629 | * older userspace tools (before 2.0-870) did not pass us | |
630 | * the leading conn's ep so this will be NULL; | |
631 | */ | |
6192d4e6 | 632 | if (ep) { |
5716af6e | 633 | iser_conn = ep->dd_data; |
f4641ef7 | 634 | max_cmds = iser_conn->max_cmds; |
df749cdc | 635 | shost->sg_tablesize = iser_conn->scsi_sg_tablesize; |
3f562a0b AN |
636 | |
637 | mutex_lock(&iser_conn->state_mutex); | |
638 | if (iser_conn->state != ISER_CONN_UP) { | |
639 | iser_err("iser conn %p already started teardown\n", | |
640 | iser_conn); | |
641 | mutex_unlock(&iser_conn->state_mutex); | |
642 | goto free_host; | |
643 | } | |
644 | ||
a4ee3539 SG |
645 | ib_conn = &iser_conn->ib_conn; |
646 | if (ib_conn->pi_support) { | |
4a061b28 | 647 | u32 sig_caps = ib_conn->device->ib_device->attrs.sig_prot_cap; |
6192d4e6 SG |
648 | |
649 | scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); | |
5bb6e543 SG |
650 | scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | |
651 | SHOST_DIX_GUARD_CRC); | |
6192d4e6 | 652 | } |
3f562a0b AN |
653 | |
654 | if (iscsi_host_add(shost, | |
61118cec | 655 | ib_conn->device->ib_device->dev.parent)) { |
3f562a0b AN |
656 | mutex_unlock(&iser_conn->state_mutex); |
657 | goto free_host; | |
658 | } | |
659 | mutex_unlock(&iser_conn->state_mutex); | |
f4641ef7 MT |
660 | } else { |
661 | max_cmds = ISER_DEF_XMIT_CMDS_MAX; | |
3f562a0b AN |
662 | if (iscsi_host_add(shost, NULL)) |
663 | goto free_host; | |
6192d4e6 | 664 | } |
412eeafa | 665 | |
9c674815 CH |
666 | /* |
667 | * FRs or FMRs can only map up to a (device) page per entry, but if the | |
668 | * first entry is misaligned we'll end up using using two entries | |
669 | * (head and tail) for a single page worth data, so we have to drop | |
670 | * one segment from the calculation. | |
671 | */ | |
672 | max_fr_sectors = ((shost->sg_tablesize - 1) * PAGE_SIZE) >> 9; | |
673 | shost->max_sectors = min(iser_max_sectors, max_fr_sectors); | |
674 | ||
83236f01 MG |
675 | iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n", |
676 | iser_conn, shost->sg_tablesize, | |
677 | shost->max_sectors); | |
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; | |
dd0107a0 | 769 | stats->custom_length = 0; |
65e7ae7b OG |
770 | } |
771 | ||
7c53c6f8 MC |
772 | static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
773 | enum iscsi_param param, char *buf) | |
774 | { | |
5716af6e | 775 | struct iser_conn *iser_conn = ep->dd_data; |
7c53c6f8 MC |
776 | int len; |
777 | ||
778 | switch (param) { | |
779 | case ISCSI_PARAM_CONN_PORT: | |
780 | case ISCSI_PARAM_CONN_ADDRESS: | |
a4ee3539 | 781 | if (!iser_conn || !iser_conn->ib_conn.cma_id) |
7c53c6f8 MC |
782 | return -ENOTCONN; |
783 | ||
784 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
a4ee3539 SG |
785 | &iser_conn->ib_conn.cma_id->route.addr.dst_addr, |
786 | param, buf); | |
7c53c6f8 MC |
787 | break; |
788 | default: | |
789 | return -ENOSYS; | |
790 | } | |
791 | ||
792 | return len; | |
793 | } | |
794 | ||
dc05ac36 SG |
795 | /** |
796 | * iscsi_iser_ep_connect() - Initiate iSER connection establishment | |
797 | * @shost: scsi_host | |
798 | * @dst_addr: destination address | |
799 | * @non-blocking: indicate if routine can block | |
800 | * | |
801 | * Allocate an iscsi endpoint, an iser_conn structure and bind them. | |
802 | * After that start RDMA connection establishment via rdma_cm. We | |
803 | * don't allocate iser_conn embedded in iscsi_endpoint since in teardown | |
804 | * the endpoint will be destroyed at ep_disconnect while iser_conn will | |
805 | * cleanup its resources asynchronuously. | |
806 | * | |
807 | * Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) | |
808 | * if fails. | |
809 | */ | |
412eeafa | 810 | static struct iscsi_endpoint * |
10eb0f01 MC |
811 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
812 | int non_blocking) | |
65e7ae7b OG |
813 | { |
814 | int err; | |
5716af6e | 815 | struct iser_conn *iser_conn; |
412eeafa | 816 | struct iscsi_endpoint *ep; |
65e7ae7b | 817 | |
0a690758 | 818 | ep = iscsi_create_endpoint(0); |
412eeafa MC |
819 | if (!ep) |
820 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 821 | |
5716af6e SG |
822 | iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
823 | if (!iser_conn) { | |
0a690758 AN |
824 | err = -ENOMEM; |
825 | goto failure; | |
826 | } | |
827 | ||
5716af6e SG |
828 | ep->dd_data = iser_conn; |
829 | iser_conn->ep = ep; | |
830 | iser_conn_init(iser_conn); | |
65e7ae7b | 831 | |
5716af6e | 832 | err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); |
7d9c0de4 | 833 | if (err) |
0a690758 | 834 | goto failure; |
7d9c0de4 | 835 | |
412eeafa | 836 | return ep; |
0a690758 AN |
837 | failure: |
838 | iscsi_destroy_endpoint(ep); | |
839 | return ERR_PTR(err); | |
65e7ae7b OG |
840 | } |
841 | ||
dc05ac36 SG |
842 | /** |
843 | * iscsi_iser_ep_poll() - poll for iser connection establishment to complete | |
844 | * @ep: iscsi endpoint (created at ep_connect) | |
845 | * @timeout_ms: polling timeout allowed in ms. | |
846 | * | |
847 | * This routine boils down to waiting for up_completion signaling | |
848 | * that cma_id got CONNECTED event. | |
849 | * | |
850 | * Return: 1 if succeeded in connection establishment, 0 if timeout expired | |
851 | * (libiscsi will retry will kick in) or -1 if interrupted by signal | |
852 | * or more likely iser connection state transitioned to TEMINATING or | |
853 | * DOWN during the wait period. | |
854 | */ | |
65e7ae7b | 855 | static int |
412eeafa | 856 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 857 | { |
74ce897b | 858 | struct iser_conn *iser_conn = ep->dd_data; |
65e7ae7b OG |
859 | int rc; |
860 | ||
5716af6e | 861 | rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, |
9a6d3234 | 862 | msecs_to_jiffies(timeout_ms)); |
65e7ae7b | 863 | /* if conn establishment failed, return error code to iscsi */ |
504130c0 | 864 | if (rc == 0) { |
5716af6e SG |
865 | mutex_lock(&iser_conn->state_mutex); |
866 | if (iser_conn->state == ISER_CONN_TERMINATING || | |
867 | iser_conn->state == ISER_CONN_DOWN) | |
504130c0 | 868 | rc = -1; |
5716af6e | 869 | mutex_unlock(&iser_conn->state_mutex); |
504130c0 | 870 | } |
65e7ae7b | 871 | |
74ce897b | 872 | iser_info("iser conn %p rc = %d\n", iser_conn, rc); |
65e7ae7b OG |
873 | |
874 | if (rc > 0) | |
875 | return 1; /* success, this is the equivalent of POLLOUT */ | |
876 | else if (!rc) | |
877 | return 0; /* timeout */ | |
878 | else | |
879 | return rc; /* signal */ | |
880 | } | |
881 | ||
dc05ac36 SG |
882 | /** |
883 | * iscsi_iser_ep_disconnect() - Initiate connection teardown process | |
884 | * @ep: iscsi endpoint handle | |
885 | * | |
886 | * This routine is not blocked by iser and RDMA termination process | |
887 | * completion as we queue a deffered work for iser/RDMA destruction | |
888 | * and cleanup or actually call it immediately in case we didn't pass | |
889 | * iscsi conn bind/start stage, thus it is safe. | |
890 | */ | |
65e7ae7b | 891 | static void |
412eeafa | 892 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 893 | { |
74ce897b | 894 | struct iser_conn *iser_conn = ep->dd_data; |
65e7ae7b | 895 | |
74ce897b | 896 | iser_info("ep %p iser conn %p\n", ep, iser_conn); |
5716af6e SG |
897 | |
898 | mutex_lock(&iser_conn->state_mutex); | |
899 | iser_conn_terminate(iser_conn); | |
b73c3ada AN |
900 | |
901 | /* | |
9a6d3234 AN |
902 | * if iser_conn and iscsi_conn are bound, we must wait for |
903 | * iscsi_conn_stop and flush errors completion before freeing | |
904 | * the iser resources. Otherwise we are safe to free resources | |
905 | * immediately. | |
b73c3ada | 906 | */ |
5716af6e SG |
907 | if (iser_conn->iscsi_conn) { |
908 | INIT_WORK(&iser_conn->release_work, iser_release_work); | |
909 | queue_work(release_wq, &iser_conn->release_work); | |
910 | mutex_unlock(&iser_conn->state_mutex); | |
b73c3ada | 911 | } else { |
5716af6e SG |
912 | iser_conn->state = ISER_CONN_DOWN; |
913 | mutex_unlock(&iser_conn->state_mutex); | |
914 | iser_conn_release(iser_conn); | |
b73c3ada | 915 | } |
1156cc80 | 916 | |
0a690758 | 917 | iscsi_destroy_endpoint(ep); |
65e7ae7b OG |
918 | } |
919 | ||
587a1f16 | 920 | static umode_t iser_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
921 | { |
922 | switch (param_type) { | |
f27fb2ef MC |
923 | case ISCSI_HOST_PARAM: |
924 | switch (param) { | |
925 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
926 | case ISCSI_HOST_PARAM_HWADDRESS: | |
927 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
928 | return S_IRUGO; | |
929 | default: | |
930 | return 0; | |
931 | } | |
3128c6c7 MC |
932 | case ISCSI_PARAM: |
933 | switch (param) { | |
934 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
935 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
936 | case ISCSI_PARAM_HDRDGST_EN: | |
937 | case ISCSI_PARAM_DATADGST_EN: | |
938 | case ISCSI_PARAM_CONN_ADDRESS: | |
939 | case ISCSI_PARAM_CONN_PORT: | |
940 | case ISCSI_PARAM_EXP_STATSN: | |
941 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
942 | case ISCSI_PARAM_PERSISTENT_PORT: | |
943 | case ISCSI_PARAM_PING_TMO: | |
944 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
945 | case ISCSI_PARAM_INITIAL_R2T_EN: |
946 | case ISCSI_PARAM_MAX_R2T: | |
947 | case ISCSI_PARAM_IMM_DATA_EN: | |
948 | case ISCSI_PARAM_FIRST_BURST: | |
949 | case ISCSI_PARAM_MAX_BURST: | |
950 | case ISCSI_PARAM_PDU_INORDER_EN: | |
951 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
952 | case ISCSI_PARAM_TARGET_NAME: | |
953 | case ISCSI_PARAM_TPGT: | |
954 | case ISCSI_PARAM_USERNAME: | |
955 | case ISCSI_PARAM_PASSWORD: | |
956 | case ISCSI_PARAM_USERNAME_IN: | |
957 | case ISCSI_PARAM_PASSWORD_IN: | |
958 | case ISCSI_PARAM_FAST_ABORT: | |
959 | case ISCSI_PARAM_ABORT_TMO: | |
960 | case ISCSI_PARAM_LU_RESET_TMO: | |
961 | case ISCSI_PARAM_TGT_RESET_TMO: | |
962 | case ISCSI_PARAM_IFACE_NAME: | |
963 | case ISCSI_PARAM_INITIATOR_NAME: | |
6a06a4b8 | 964 | case ISCSI_PARAM_DISCOVERY_SESS: |
3128c6c7 MC |
965 | return S_IRUGO; |
966 | default: | |
967 | return 0; | |
968 | } | |
969 | } | |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
dd0107a0 SG |
974 | static int iscsi_iser_slave_alloc(struct scsi_device *sdev) |
975 | { | |
318d311e SG |
976 | struct iscsi_session *session; |
977 | struct iser_conn *iser_conn; | |
978 | struct ib_device *ib_dev; | |
979 | ||
980 | session = starget_to_session(scsi_target(sdev))->dd_data; | |
981 | iser_conn = session->leadconn->dd_data; | |
982 | ib_dev = iser_conn->ib_conn.device->ib_device; | |
983 | ||
984 | if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)) | |
985 | blk_queue_virt_boundary(sdev->request_queue, ~MASK_4K); | |
dd0107a0 SG |
986 | |
987 | return 0; | |
988 | } | |
989 | ||
65e7ae7b | 990 | static struct scsi_host_template iscsi_iser_sht = { |
7974392c | 991 | .module = THIS_MODULE, |
c1d786e6 | 992 | .name = "iSCSI Initiator over iSER", |
65e7ae7b | 993 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 994 | .change_queue_depth = scsi_change_queue_depth, |
df749cdc | 995 | .sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE, |
e28f3d5b | 996 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
b6a05c82 | 997 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
65e7ae7b | 998 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 999 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 1000 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 1001 | .target_alloc = iscsi_target_alloc, |
630c3183 | 1002 | .use_clustering = ENABLE_CLUSTERING, |
dd0107a0 | 1003 | .slave_alloc = iscsi_iser_slave_alloc, |
65e7ae7b OG |
1004 | .proc_name = "iscsi_iser", |
1005 | .this_id = -1, | |
c40ecc12 | 1006 | .track_queue_depth = 1, |
65e7ae7b OG |
1007 | }; |
1008 | ||
1009 | static struct iscsi_transport iscsi_iser_transport = { | |
1010 | .owner = THIS_MODULE, | |
1011 | .name = "iser", | |
6a06a4b8 | 1012 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, |
65e7ae7b OG |
1013 | /* session management */ |
1014 | .create_session = iscsi_iser_session_create, | |
75613521 | 1015 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
1016 | /* connection management */ |
1017 | .create_conn = iscsi_iser_conn_create, | |
1018 | .bind_conn = iscsi_iser_conn_bind, | |
b73c3ada | 1019 | .destroy_conn = iscsi_conn_teardown, |
3128c6c7 | 1020 | .attr_is_visible = iser_attr_is_visible, |
358ff019 MC |
1021 | .set_param = iscsi_iser_set_param, |
1022 | .get_conn_param = iscsi_conn_get_param, | |
7c53c6f8 | 1023 | .get_ep_param = iscsi_iser_get_ep_param, |
358ff019 | 1024 | .get_session_param = iscsi_session_get_param, |
b73c3ada | 1025 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 1026 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
1027 | /* iscsi host params */ |
1028 | .get_host_param = iscsi_host_get_param, | |
1029 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
1030 | /* IO */ |
1031 | .send_pdu = iscsi_conn_send_pdu, | |
1032 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
1033 | .init_task = iscsi_iser_task_init, |
1034 | .xmit_task = iscsi_iser_task_xmit, | |
1035 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 1036 | .alloc_pdu = iscsi_iser_pdu_alloc, |
0a7a08ad | 1037 | .check_protection = iscsi_iser_check_protection, |
65e7ae7b OG |
1038 | /* recovery */ |
1039 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
1040 | ||
1041 | .ep_connect = iscsi_iser_ep_connect, | |
1042 | .ep_poll = iscsi_iser_ep_poll, | |
1043 | .ep_disconnect = iscsi_iser_ep_disconnect | |
1044 | }; | |
1045 | ||
1046 | static int __init iser_init(void) | |
1047 | { | |
1048 | int err; | |
1049 | ||
1050 | iser_dbg("Starting iSER datamover...\n"); | |
1051 | ||
1052 | if (iscsi_max_lun < 1) { | |
4f363882 | 1053 | iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
65e7ae7b OG |
1054 | return -EINVAL; |
1055 | } | |
1056 | ||
65e7ae7b OG |
1057 | memset(&ig, 0, sizeof(struct iser_global)); |
1058 | ||
1059 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 1060 | sizeof(struct iser_tx_desc), |
65e7ae7b | 1061 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 1062 | NULL); |
65e7ae7b OG |
1063 | if (ig.desc_cache == NULL) |
1064 | return -ENOMEM; | |
1065 | ||
1066 | /* device init is called only after the first addr resolution */ | |
1067 | mutex_init(&ig.device_list_mutex); | |
1068 | INIT_LIST_HEAD(&ig.device_list); | |
1069 | mutex_init(&ig.connlist_mutex); | |
1070 | INIT_LIST_HEAD(&ig.connlist); | |
1071 | ||
b73c3ada AN |
1072 | release_wq = alloc_workqueue("release workqueue", 0, 0); |
1073 | if (!release_wq) { | |
1074 | iser_err("failed to allocate release workqueue\n"); | |
08ff089b RD |
1075 | err = -ENOMEM; |
1076 | goto err_alloc_wq; | |
b73c3ada AN |
1077 | } |
1078 | ||
75613521 MC |
1079 | iscsi_iser_scsi_transport = iscsi_register_transport( |
1080 | &iscsi_iser_transport); | |
1081 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
1082 | iser_err("iscsi_register_transport failed\n"); |
1083 | err = -EINVAL; | |
08ff089b | 1084 | goto err_reg; |
65e7ae7b OG |
1085 | } |
1086 | ||
1087 | return 0; | |
1088 | ||
08ff089b RD |
1089 | err_reg: |
1090 | destroy_workqueue(release_wq); | |
1091 | err_alloc_wq: | |
65e7ae7b OG |
1092 | kmem_cache_destroy(ig.desc_cache); |
1093 | ||
1094 | return err; | |
1095 | } | |
1096 | ||
1097 | static void __exit iser_exit(void) | |
1098 | { | |
5716af6e | 1099 | struct iser_conn *iser_conn, *n; |
b73c3ada AN |
1100 | int connlist_empty; |
1101 | ||
65e7ae7b | 1102 | iser_dbg("Removing iSER datamover...\n"); |
b73c3ada AN |
1103 | destroy_workqueue(release_wq); |
1104 | ||
1105 | mutex_lock(&ig.connlist_mutex); | |
1106 | connlist_empty = list_empty(&ig.connlist); | |
1107 | mutex_unlock(&ig.connlist_mutex); | |
1108 | ||
1109 | if (!connlist_empty) { | |
1110 | iser_err("Error cleanup stage completed but we still have iser " | |
1156cc80 | 1111 | "connections, destroying them anyway\n"); |
5716af6e SG |
1112 | list_for_each_entry_safe(iser_conn, n, &ig.connlist, |
1113 | conn_list) { | |
1114 | iser_conn_release(iser_conn); | |
b73c3ada AN |
1115 | } |
1116 | } | |
1117 | ||
65e7ae7b OG |
1118 | iscsi_unregister_transport(&iscsi_iser_transport); |
1119 | kmem_cache_destroy(ig.desc_cache); | |
1120 | } | |
1121 | ||
1122 | module_init(iser_init); | |
1123 | module_exit(iser_exit); |