Commit | Line | Data |
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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. | |
28f292e8 | 8 | * Copyright (c) 2013 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 AT |
85 | bool iser_pi_enable = false; |
86 | int iser_pi_guard = 0; | |
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); | |
100 | MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)"); | |
101 | ||
65e7ae7b OG |
102 | struct iser_global ig; |
103 | ||
104 | void | |
105 | iscsi_iser_recv(struct iscsi_conn *conn, | |
106 | struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) | |
107 | { | |
108 | int rc = 0; | |
65e7ae7b OG |
109 | int datalen; |
110 | int ahslen; | |
111 | ||
112 | /* verify PDU length */ | |
113 | datalen = ntoh24(hdr->dlength); | |
200ae1a0 OG |
114 | if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { |
115 | iser_err("wrong datalen %d (hdr), %d (IB)\n", | |
116 | datalen, rx_data_len); | |
65e7ae7b OG |
117 | rc = ISCSI_ERR_DATALEN; |
118 | goto error; | |
119 | } | |
120 | ||
200ae1a0 OG |
121 | if (datalen != rx_data_len) |
122 | iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", | |
123 | datalen, rx_data_len); | |
124 | ||
65e7ae7b OG |
125 | /* read AHS */ |
126 | ahslen = hdr->hlength * 4; | |
127 | ||
0af967f5 | 128 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
129 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
130 | goto error; | |
131 | ||
132 | return; | |
133 | error: | |
134 | iscsi_conn_failure(conn, rc); | |
135 | } | |
136 | ||
2ff79d52 | 137 | static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
0f9c7449 MC |
138 | { |
139 | struct iscsi_iser_task *iser_task = task->dd_data; | |
140 | ||
141 | task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; | |
142 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
143 | return 0; | |
144 | } | |
65e7ae7b | 145 | |
f19624aa OG |
146 | int iser_initialize_task_headers(struct iscsi_task *task, |
147 | struct iser_tx_desc *tx_desc) | |
148 | { | |
149 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; | |
150 | struct iser_device *device = iser_conn->ib_conn->device; | |
151 | struct iscsi_iser_task *iser_task = task->dd_data; | |
152 | u64 dma_addr; | |
153 | ||
154 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
155 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
156 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) | |
157 | return -ENOMEM; | |
158 | ||
159 | tx_desc->dma_addr = dma_addr; | |
160 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
161 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
162 | tx_desc->tx_sg[0].lkey = device->mr->lkey; | |
163 | ||
f19624aa OG |
164 | iser_task->iser_conn = iser_conn; |
165 | return 0; | |
166 | } | |
65e7ae7b | 167 | /** |
2261ec3d MC |
168 | * iscsi_iser_task_init - Initialize task |
169 | * @task: iscsi task | |
65e7ae7b | 170 | * |
2261ec3d | 171 | * Initialize the task for the scsi command or mgmt command. |
2747fdb2 | 172 | */ |
a8ac6311 | 173 | static int |
2261ec3d | 174 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 175 | { |
2261ec3d | 176 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 177 | |
52439540 | 178 | if (iser_initialize_task_headers(task, &iser_task->desc)) |
f19624aa OG |
179 | return -ENOMEM; |
180 | ||
2261ec3d | 181 | /* mgmt task */ |
f19624aa | 182 | if (!task->sc) |
2747fdb2 | 183 | return 0; |
65e7ae7b | 184 | |
2261ec3d | 185 | iser_task->command_sent = 0; |
2261ec3d | 186 | iser_task_rdma_init(iser_task); |
177e31bd SG |
187 | iser_task->sc = task->sc; |
188 | ||
a8ac6311 | 189 | return 0; |
65e7ae7b OG |
190 | } |
191 | ||
192 | /** | |
2261ec3d | 193 | * iscsi_iser_mtask_xmit - xmit management(immediate) task |
65e7ae7b | 194 | * @conn: iscsi connection |
2261ec3d | 195 | * @task: task management task |
65e7ae7b OG |
196 | * |
197 | * Notes: | |
198 | * The function can return -EAGAIN in which case caller must | |
199 | * call it again later, or recover. '0' return code means successful | |
200 | * xmit. | |
201 | * | |
202 | **/ | |
203 | static int | |
2261ec3d | 204 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
205 | { |
206 | int error = 0; | |
207 | ||
962b4b52 | 208 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 209 | |
2261ec3d | 210 | error = iser_send_control(conn, task); |
65e7ae7b | 211 | |
2261ec3d | 212 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
213 | * right after sending them. |
214 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
215 | * - if yes, the task is recycled at iscsi_complete_pdu |
216 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 217 | */ |
65e7ae7b OG |
218 | return error; |
219 | } | |
220 | ||
221 | static int | |
2747fdb2 | 222 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 223 | struct iscsi_task *task) |
65e7ae7b | 224 | { |
0f9c7449 MC |
225 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
226 | struct iscsi_data hdr; | |
65e7ae7b | 227 | int error = 0; |
65e7ae7b OG |
228 | |
229 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
230 | while (iscsi_task_has_unsol_data(task)) { |
231 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 232 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 233 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
234 | |
235 | /* the buffer description has been passed with the command */ | |
236 | /* Send the command */ | |
2261ec3d | 237 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 238 | if (error) { |
0f9c7449 | 239 | r2t->datasn--; |
2747fdb2 | 240 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 241 | } |
0f9c7449 | 242 | r2t->sent += r2t->data_count; |
48a237a2 | 243 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 244 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
245 | } |
246 | ||
2747fdb2 | 247 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
248 | return error; |
249 | } | |
250 | ||
251 | static int | |
2261ec3d | 252 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 253 | { |
2261ec3d MC |
254 | struct iscsi_conn *conn = task->conn; |
255 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
256 | int error = 0; |
257 | ||
2261ec3d MC |
258 | if (!task->sc) |
259 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 260 | |
2261ec3d MC |
261 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
262 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 263 | |
48a237a2 | 264 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 265 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 266 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
267 | } |
268 | ||
962b4b52 | 269 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 270 | conn->id, task->itt); |
65e7ae7b | 271 | |
65e7ae7b | 272 | /* Send the cmd PDU */ |
2261ec3d MC |
273 | if (!iser_task->command_sent) { |
274 | error = iser_send_command(conn, task); | |
65e7ae7b | 275 | if (error) |
2747fdb2 | 276 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 277 | iser_task->command_sent = 1; |
65e7ae7b OG |
278 | } |
279 | ||
280 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 281 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 282 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 283 | |
2747fdb2 | 284 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
285 | return error; |
286 | } | |
287 | ||
0f9c7449 | 288 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 289 | { |
2261ec3d | 290 | struct iscsi_iser_task *iser_task = task->dd_data; |
52439540 OG |
291 | struct iser_tx_desc *tx_desc = &iser_task->desc; |
292 | ||
293 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; | |
294 | struct iser_device *device = iser_conn->ib_conn->device; | |
295 | ||
296 | ib_dma_unmap_single(device->ib_device, | |
297 | tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
65e7ae7b | 298 | |
b3cd5050 MC |
299 | /* mgmt tasks do not need special cleanup */ |
300 | if (!task->sc) | |
2747fdb2 | 301 | return; |
65e7ae7b | 302 | |
2261ec3d MC |
303 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
304 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
305 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 306 | } |
65e7ae7b OG |
307 | } |
308 | ||
309 | static struct iscsi_cls_conn * | |
310 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
311 | { | |
312 | struct iscsi_conn *conn; | |
313 | struct iscsi_cls_conn *cls_conn; | |
314 | struct iscsi_iser_conn *iser_conn; | |
315 | ||
5d91e209 | 316 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); |
65e7ae7b OG |
317 | if (!cls_conn) |
318 | return NULL; | |
319 | conn = cls_conn->dd_data; | |
320 | ||
321 | /* | |
322 | * due to issues with the login code re iser sematics | |
323 | * this not set in iscsi_conn_setup - FIXME | |
324 | */ | |
bcc60c38 | 325 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 326 | |
5d91e209 | 327 | iser_conn = conn->dd_data; |
65e7ae7b OG |
328 | conn->dd_data = iser_conn; |
329 | iser_conn->iscsi_conn = conn; | |
330 | ||
331 | return cls_conn; | |
65e7ae7b OG |
332 | } |
333 | ||
334 | static void | |
335 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
336 | { | |
337 | struct iscsi_conn *conn = cls_conn->dd_data; | |
338 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
b40977d9 | 339 | struct iser_conn *ib_conn = iser_conn->ib_conn; |
65e7ae7b OG |
340 | |
341 | iscsi_conn_teardown(cls_conn); | |
b40977d9 MC |
342 | /* |
343 | * Userspace will normally call the stop callback and | |
344 | * already have freed the ib_conn, but if it goofed up then | |
345 | * we free it here. | |
346 | */ | |
347 | if (ib_conn) { | |
348 | ib_conn->iser_conn = NULL; | |
39ff05db | 349 | iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ |
b40977d9 | 350 | } |
65e7ae7b OG |
351 | } |
352 | ||
353 | static int | |
354 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
355 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
356 | int is_leading) | |
357 | { | |
358 | struct iscsi_conn *conn = cls_conn->dd_data; | |
359 | struct iscsi_iser_conn *iser_conn; | |
b7f04513 | 360 | struct iscsi_session *session; |
65e7ae7b | 361 | struct iser_conn *ib_conn; |
412eeafa | 362 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
363 | int error; |
364 | ||
365 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
366 | if (error) | |
367 | return error; | |
368 | ||
369 | /* the transport ep handle comes from user space so it must be | |
370 | * verified against the global ib connections list */ | |
412eeafa MC |
371 | ep = iscsi_lookup_endpoint(transport_eph); |
372 | if (!ep) { | |
65e7ae7b OG |
373 | iser_err("can't bind eph %llx\n", |
374 | (unsigned long long)transport_eph); | |
375 | return -EINVAL; | |
376 | } | |
412eeafa MC |
377 | ib_conn = ep->dd_data; |
378 | ||
b7f04513 SP |
379 | session = conn->session; |
380 | if (iser_alloc_rx_descriptors(ib_conn, session)) | |
89e984e2 OG |
381 | return -ENOMEM; |
382 | ||
65e7ae7b OG |
383 | /* binds the iSER connection retrieved from the previously |
384 | * connected ep_handle to the iSCSI layer connection. exchanges | |
385 | * connection pointers */ | |
4f363882 RD |
386 | iser_info("binding iscsi/iser conn %p %p to ib_conn %p\n", |
387 | conn, conn->dd_data, ib_conn); | |
65e7ae7b OG |
388 | iser_conn = conn->dd_data; |
389 | ib_conn->iser_conn = iser_conn; | |
390 | iser_conn->ib_conn = ib_conn; | |
39ff05db | 391 | iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */ |
65e7ae7b OG |
392 | return 0; |
393 | } | |
65e7ae7b | 394 | |
b40977d9 MC |
395 | static void |
396 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
397 | { | |
398 | struct iscsi_conn *conn = cls_conn->dd_data; | |
399 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
400 | struct iser_conn *ib_conn = iser_conn->ib_conn; | |
65e7ae7b | 401 | |
b40977d9 | 402 | /* |
913e5bf4 MC |
403 | * Userspace may have goofed up and not bound the connection or |
404 | * might have only partially setup the connection. | |
b40977d9 | 405 | */ |
913e5bf4 MC |
406 | if (ib_conn) { |
407 | iscsi_conn_stop(cls_conn, flag); | |
408 | /* | |
409 | * There is no unbind event so the stop callback | |
410 | * must release the ref from the bind. | |
411 | */ | |
39ff05db | 412 | iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */ |
913e5bf4 | 413 | } |
b40977d9 | 414 | iser_conn->ib_conn = NULL; |
65e7ae7b OG |
415 | } |
416 | ||
75613521 MC |
417 | static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
418 | { | |
419 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
420 | ||
e5bd7b54 | 421 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
422 | iscsi_host_remove(shost); |
423 | iscsi_host_free(shost); | |
75613521 | 424 | } |
65e7ae7b OG |
425 | |
426 | static struct iscsi_cls_session * | |
412eeafa | 427 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 428 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 429 | uint32_t initial_cmdsn) |
65e7ae7b OG |
430 | { |
431 | struct iscsi_cls_session *cls_session; | |
432 | struct iscsi_session *session; | |
412eeafa | 433 | struct Scsi_Host *shost; |
b7f04513 | 434 | struct iser_conn *ib_conn = NULL; |
75613521 | 435 | |
962b4b52 | 436 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
437 | if (!shost) |
438 | return NULL; | |
439 | shost->transportt = iscsi_iser_scsi_transport; | |
b7f04513 | 440 | shost->cmd_per_lun = qdepth; |
75613521 MC |
441 | shost->max_lun = iscsi_max_lun; |
442 | shost->max_id = 0; | |
443 | shost->max_channel = 0; | |
444 | shost->max_cmd_len = 16; | |
445 | ||
412eeafa MC |
446 | /* |
447 | * older userspace tools (before 2.0-870) did not pass us | |
448 | * the leading conn's ep so this will be NULL; | |
449 | */ | |
450 | if (ep) | |
451 | ib_conn = ep->dd_data; | |
452 | ||
453 | if (iscsi_host_add(shost, | |
454 | ep ? ib_conn->device->ib_device->dma_device : NULL)) | |
75613521 | 455 | goto free_host; |
65e7ae7b | 456 | |
b7f04513 SP |
457 | if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) { |
458 | iser_info("cmds_max changed from %u to %u\n", | |
459 | cmds_max, ISER_DEF_XMIT_CMDS_MAX); | |
460 | cmds_max = ISER_DEF_XMIT_CMDS_MAX; | |
461 | } | |
462 | ||
75613521 | 463 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b7f04513 | 464 | cmds_max, 0, |
2261ec3d | 465 | sizeof(struct iscsi_iser_task), |
7970634b | 466 | initial_cmdsn, 0); |
65e7ae7b | 467 | if (!cls_session) |
75613521 MC |
468 | goto remove_host; |
469 | session = cls_session->dd_data; | |
65e7ae7b | 470 | |
2747fdb2 | 471 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 472 | return cls_session; |
75613521 MC |
473 | |
474 | remove_host: | |
a4804cd6 | 475 | iscsi_host_remove(shost); |
75613521 | 476 | free_host: |
a4804cd6 | 477 | iscsi_host_free(shost); |
75613521 | 478 | return NULL; |
65e7ae7b OG |
479 | } |
480 | ||
481 | static int | |
358ff019 MC |
482 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
483 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 484 | { |
358ff019 | 485 | int value; |
65e7ae7b OG |
486 | |
487 | switch (param) { | |
488 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
489 | /* TBD */ | |
490 | break; | |
65e7ae7b | 491 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 492 | sscanf(buf, "%d", &value); |
65e7ae7b | 493 | if (value) { |
4f363882 | 494 | iser_err("DataDigest wasn't negotiated to None"); |
65e7ae7b OG |
495 | return -EPROTO; |
496 | } | |
497 | break; | |
498 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 499 | sscanf(buf, "%d", &value); |
65e7ae7b | 500 | if (value) { |
4f363882 | 501 | iser_err("DataDigest wasn't negotiated to None"); |
65e7ae7b OG |
502 | return -EPROTO; |
503 | } | |
504 | break; | |
65e7ae7b | 505 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 506 | sscanf(buf, "%d", &value); |
65e7ae7b | 507 | if (value) { |
4f363882 | 508 | iser_err("IFMarker wasn't negotiated to No"); |
65e7ae7b OG |
509 | return -EPROTO; |
510 | } | |
511 | break; | |
512 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 513 | sscanf(buf, "%d", &value); |
65e7ae7b | 514 | if (value) { |
4f363882 | 515 | iser_err("OFMarker wasn't negotiated to No"); |
65e7ae7b OG |
516 | return -EPROTO; |
517 | } | |
518 | break; | |
519 | default: | |
358ff019 | 520 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
521 | } |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
65e7ae7b OG |
526 | static void |
527 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
528 | { | |
529 | struct iscsi_conn *conn = cls_conn->dd_data; | |
530 | ||
531 | stats->txdata_octets = conn->txdata_octets; | |
532 | stats->rxdata_octets = conn->rxdata_octets; | |
533 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
534 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
535 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
536 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
537 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
538 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
539 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 540 | stats->custom_length = 4; |
65e7ae7b OG |
541 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
542 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
543 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
544 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
545 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
546 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
547 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
548 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
549 | } |
550 | ||
7c53c6f8 MC |
551 | static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
552 | enum iscsi_param param, char *buf) | |
553 | { | |
554 | struct iser_conn *ib_conn = ep->dd_data; | |
555 | int len; | |
556 | ||
557 | switch (param) { | |
558 | case ISCSI_PARAM_CONN_PORT: | |
559 | case ISCSI_PARAM_CONN_ADDRESS: | |
560 | if (!ib_conn || !ib_conn->cma_id) | |
561 | return -ENOTCONN; | |
562 | ||
563 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
564 | &ib_conn->cma_id->route.addr.dst_addr, | |
565 | param, buf); | |
566 | break; | |
567 | default: | |
568 | return -ENOSYS; | |
569 | } | |
570 | ||
571 | return len; | |
572 | } | |
573 | ||
412eeafa | 574 | static struct iscsi_endpoint * |
10eb0f01 MC |
575 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
576 | int non_blocking) | |
65e7ae7b OG |
577 | { |
578 | int err; | |
579 | struct iser_conn *ib_conn; | |
412eeafa | 580 | struct iscsi_endpoint *ep; |
65e7ae7b | 581 | |
412eeafa MC |
582 | ep = iscsi_create_endpoint(sizeof(*ib_conn)); |
583 | if (!ep) | |
584 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 585 | |
412eeafa MC |
586 | ib_conn = ep->dd_data; |
587 | ib_conn->ep = ep; | |
588 | iser_conn_init(ib_conn); | |
65e7ae7b | 589 | |
412eeafa MC |
590 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, |
591 | non_blocking); | |
7d9c0de4 | 592 | if (err) |
412eeafa | 593 | return ERR_PTR(err); |
7d9c0de4 | 594 | |
412eeafa | 595 | return ep; |
65e7ae7b OG |
596 | } |
597 | ||
598 | static int | |
412eeafa | 599 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 600 | { |
412eeafa | 601 | struct iser_conn *ib_conn; |
65e7ae7b OG |
602 | int rc; |
603 | ||
412eeafa | 604 | ib_conn = ep->dd_data; |
65e7ae7b OG |
605 | rc = wait_event_interruptible_timeout(ib_conn->wait, |
606 | ib_conn->state == ISER_CONN_UP, | |
607 | msecs_to_jiffies(timeout_ms)); | |
608 | ||
609 | /* if conn establishment failed, return error code to iscsi */ | |
610 | if (!rc && | |
611 | (ib_conn->state == ISER_CONN_TERMINATING || | |
612 | ib_conn->state == ISER_CONN_DOWN)) | |
613 | rc = -1; | |
614 | ||
4f363882 | 615 | iser_info("ib conn %p rc = %d\n", ib_conn, rc); |
65e7ae7b OG |
616 | |
617 | if (rc > 0) | |
618 | return 1; /* success, this is the equivalent of POLLOUT */ | |
619 | else if (!rc) | |
620 | return 0; /* timeout */ | |
621 | else | |
622 | return rc; /* signal */ | |
623 | } | |
624 | ||
625 | static void | |
412eeafa | 626 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 627 | { |
1c83469d | 628 | struct iser_conn *ib_conn; |
65e7ae7b | 629 | |
412eeafa | 630 | ib_conn = ep->dd_data; |
b40977d9 MC |
631 | if (ib_conn->iser_conn) |
632 | /* | |
633 | * Must suspend xmit path if the ep is bound to the | |
634 | * iscsi_conn, so we know we are not accessing the ib_conn | |
635 | * when we free it. | |
636 | * | |
637 | * This may not be bound if the ep poll failed. | |
638 | */ | |
639 | iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); | |
640 | ||
65e7ae7b | 641 | |
4f363882 | 642 | iser_info("ib conn %p state %d\n", ib_conn, ib_conn->state); |
65e7ae7b OG |
643 | iser_conn_terminate(ib_conn); |
644 | } | |
645 | ||
587a1f16 | 646 | static umode_t iser_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
647 | { |
648 | switch (param_type) { | |
f27fb2ef MC |
649 | case ISCSI_HOST_PARAM: |
650 | switch (param) { | |
651 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
652 | case ISCSI_HOST_PARAM_HWADDRESS: | |
653 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
654 | return S_IRUGO; | |
655 | default: | |
656 | return 0; | |
657 | } | |
3128c6c7 MC |
658 | case ISCSI_PARAM: |
659 | switch (param) { | |
660 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
661 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
662 | case ISCSI_PARAM_HDRDGST_EN: | |
663 | case ISCSI_PARAM_DATADGST_EN: | |
664 | case ISCSI_PARAM_CONN_ADDRESS: | |
665 | case ISCSI_PARAM_CONN_PORT: | |
666 | case ISCSI_PARAM_EXP_STATSN: | |
667 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
668 | case ISCSI_PARAM_PERSISTENT_PORT: | |
669 | case ISCSI_PARAM_PING_TMO: | |
670 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
671 | case ISCSI_PARAM_INITIAL_R2T_EN: |
672 | case ISCSI_PARAM_MAX_R2T: | |
673 | case ISCSI_PARAM_IMM_DATA_EN: | |
674 | case ISCSI_PARAM_FIRST_BURST: | |
675 | case ISCSI_PARAM_MAX_BURST: | |
676 | case ISCSI_PARAM_PDU_INORDER_EN: | |
677 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
678 | case ISCSI_PARAM_TARGET_NAME: | |
679 | case ISCSI_PARAM_TPGT: | |
680 | case ISCSI_PARAM_USERNAME: | |
681 | case ISCSI_PARAM_PASSWORD: | |
682 | case ISCSI_PARAM_USERNAME_IN: | |
683 | case ISCSI_PARAM_PASSWORD_IN: | |
684 | case ISCSI_PARAM_FAST_ABORT: | |
685 | case ISCSI_PARAM_ABORT_TMO: | |
686 | case ISCSI_PARAM_LU_RESET_TMO: | |
687 | case ISCSI_PARAM_TGT_RESET_TMO: | |
688 | case ISCSI_PARAM_IFACE_NAME: | |
689 | case ISCSI_PARAM_INITIATOR_NAME: | |
6a06a4b8 | 690 | case ISCSI_PARAM_DISCOVERY_SESS: |
3128c6c7 MC |
691 | return S_IRUGO; |
692 | default: | |
693 | return 0; | |
694 | } | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
65e7ae7b | 700 | static struct scsi_host_template iscsi_iser_sht = { |
7974392c | 701 | .module = THIS_MODULE, |
c1d786e6 | 702 | .name = "iSCSI Initiator over iSER", |
65e7ae7b | 703 | .queuecommand = iscsi_queuecommand, |
6410627e | 704 | .change_queue_depth = iscsi_change_queue_depth, |
65e7ae7b | 705 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 706 | .max_sectors = 1024, |
e28f3d5b | 707 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 708 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 709 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 710 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 711 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
712 | .use_clustering = DISABLE_CLUSTERING, |
713 | .proc_name = "iscsi_iser", | |
714 | .this_id = -1, | |
715 | }; | |
716 | ||
717 | static struct iscsi_transport iscsi_iser_transport = { | |
718 | .owner = THIS_MODULE, | |
719 | .name = "iser", | |
6a06a4b8 | 720 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, |
65e7ae7b OG |
721 | /* session management */ |
722 | .create_session = iscsi_iser_session_create, | |
75613521 | 723 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
724 | /* connection management */ |
725 | .create_conn = iscsi_iser_conn_create, | |
726 | .bind_conn = iscsi_iser_conn_bind, | |
727 | .destroy_conn = iscsi_iser_conn_destroy, | |
3128c6c7 | 728 | .attr_is_visible = iser_attr_is_visible, |
358ff019 MC |
729 | .set_param = iscsi_iser_set_param, |
730 | .get_conn_param = iscsi_conn_get_param, | |
7c53c6f8 | 731 | .get_ep_param = iscsi_iser_get_ep_param, |
358ff019 | 732 | .get_session_param = iscsi_session_get_param, |
89e984e2 | 733 | .start_conn = iscsi_conn_start, |
b40977d9 | 734 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
735 | /* iscsi host params */ |
736 | .get_host_param = iscsi_host_get_param, | |
737 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
738 | /* IO */ |
739 | .send_pdu = iscsi_conn_send_pdu, | |
740 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
741 | .init_task = iscsi_iser_task_init, |
742 | .xmit_task = iscsi_iser_task_xmit, | |
743 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 744 | .alloc_pdu = iscsi_iser_pdu_alloc, |
65e7ae7b OG |
745 | /* recovery */ |
746 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
747 | ||
748 | .ep_connect = iscsi_iser_ep_connect, | |
749 | .ep_poll = iscsi_iser_ep_poll, | |
750 | .ep_disconnect = iscsi_iser_ep_disconnect | |
751 | }; | |
752 | ||
753 | static int __init iser_init(void) | |
754 | { | |
755 | int err; | |
756 | ||
757 | iser_dbg("Starting iSER datamover...\n"); | |
758 | ||
759 | if (iscsi_max_lun < 1) { | |
4f363882 | 760 | iser_err("Invalid max_lun value of %u\n", iscsi_max_lun); |
65e7ae7b OG |
761 | return -EINVAL; |
762 | } | |
763 | ||
65e7ae7b OG |
764 | memset(&ig, 0, sizeof(struct iser_global)); |
765 | ||
766 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 767 | sizeof(struct iser_tx_desc), |
65e7ae7b | 768 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 769 | NULL); |
65e7ae7b OG |
770 | if (ig.desc_cache == NULL) |
771 | return -ENOMEM; | |
772 | ||
773 | /* device init is called only after the first addr resolution */ | |
774 | mutex_init(&ig.device_list_mutex); | |
775 | INIT_LIST_HEAD(&ig.device_list); | |
776 | mutex_init(&ig.connlist_mutex); | |
777 | INIT_LIST_HEAD(&ig.connlist); | |
778 | ||
75613521 MC |
779 | iscsi_iser_scsi_transport = iscsi_register_transport( |
780 | &iscsi_iser_transport); | |
781 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
782 | iser_err("iscsi_register_transport failed\n"); |
783 | err = -EINVAL; | |
784 | goto register_transport_failure; | |
785 | } | |
786 | ||
787 | return 0; | |
788 | ||
789 | register_transport_failure: | |
790 | kmem_cache_destroy(ig.desc_cache); | |
791 | ||
792 | return err; | |
793 | } | |
794 | ||
795 | static void __exit iser_exit(void) | |
796 | { | |
797 | iser_dbg("Removing iSER datamover...\n"); | |
798 | iscsi_unregister_transport(&iscsi_iser_transport); | |
799 | kmem_cache_destroy(ig.desc_cache); | |
800 | } | |
801 | ||
802 | module_init(iser_init); | |
803 | module_exit(iser_exit); |