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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. | |
8 | * maintained by openib-general@openib.org | |
9 | * | |
10 | * This software is available to you under a choice of one of two | |
11 | * licenses. You may choose to be licensed under the terms of the GNU | |
12 | * General Public License (GPL) Version 2, available from the file | |
13 | * COPYING in the main directory of this source tree, or the | |
14 | * OpenIB.org BSD license below: | |
15 | * | |
16 | * Redistribution and use in source and binary forms, with or | |
17 | * without modification, are permitted provided that the following | |
18 | * conditions are met: | |
19 | * | |
20 | * - Redistributions of source code must retain the above | |
21 | * copyright notice, this list of conditions and the following | |
22 | * disclaimer. | |
23 | * | |
24 | * - Redistributions in binary form must reproduce the above | |
25 | * copyright notice, this list of conditions and the following | |
26 | * disclaimer in the documentation and/or other materials | |
27 | * provided with the distribution. | |
28 | * | |
29 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
30 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
31 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
32 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
33 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
34 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
35 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
36 | * SOFTWARE. | |
37 | * | |
38 | * Credits: | |
39 | * Christoph Hellwig | |
40 | * FUJITA Tomonori | |
41 | * Arne Redlich | |
42 | * Zhenyu Wang | |
43 | * Modified by: | |
44 | * Erez Zilber | |
65e7ae7b OG |
45 | */ |
46 | ||
47 | #include <linux/types.h> | |
48 | #include <linux/list.h> | |
49 | #include <linux/hardirq.h> | |
50 | #include <linux/kfifo.h> | |
51 | #include <linux/blkdev.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/ioctl.h> | |
65e7ae7b OG |
54 | #include <linux/cdev.h> |
55 | #include <linux/in.h> | |
56 | #include <linux/net.h> | |
57 | #include <linux/scatterlist.h> | |
58 | #include <linux/delay.h> | |
59 | ||
60 | #include <net/sock.h> | |
61 | ||
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #include <scsi/scsi_cmnd.h> | |
65 | #include <scsi/scsi_device.h> | |
66 | #include <scsi/scsi_eh.h> | |
67 | #include <scsi/scsi_tcq.h> | |
68 | #include <scsi/scsi_host.h> | |
69 | #include <scsi/scsi.h> | |
70 | #include <scsi/scsi_transport_iscsi.h> | |
71 | ||
72 | #include "iscsi_iser.h" | |
73 | ||
75613521 MC |
74 | static struct scsi_host_template iscsi_iser_sht; |
75 | static struct iscsi_transport iscsi_iser_transport; | |
76 | static struct scsi_transport_template *iscsi_iser_scsi_transport; | |
77 | ||
65e7ae7b OG |
78 | static unsigned int iscsi_max_lun = 512; |
79 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
80 | ||
81 | int iser_debug_level = 0; | |
82 | ||
83 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " | |
84 | "v" DRV_VER " (" DRV_DATE ")"); | |
85 | MODULE_LICENSE("Dual BSD/GPL"); | |
86 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); | |
87 | ||
88 | module_param_named(debug_level, iser_debug_level, int, 0644); | |
89 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); | |
90 | ||
91 | struct iser_global ig; | |
92 | ||
93 | void | |
94 | iscsi_iser_recv(struct iscsi_conn *conn, | |
95 | struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) | |
96 | { | |
97 | int rc = 0; | |
65e7ae7b OG |
98 | int datalen; |
99 | int ahslen; | |
100 | ||
101 | /* verify PDU length */ | |
102 | datalen = ntoh24(hdr->dlength); | |
103 | if (datalen != rx_data_len) { | |
104 | printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", | |
105 | datalen, rx_data_len); | |
106 | rc = ISCSI_ERR_DATALEN; | |
107 | goto error; | |
108 | } | |
109 | ||
110 | /* read AHS */ | |
111 | ahslen = hdr->hlength * 4; | |
112 | ||
0af967f5 | 113 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
114 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
115 | goto error; | |
116 | ||
117 | return; | |
118 | error: | |
119 | iscsi_conn_failure(conn, rc); | |
120 | } | |
121 | ||
2ff79d52 | 122 | static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
0f9c7449 MC |
123 | { |
124 | struct iscsi_iser_task *iser_task = task->dd_data; | |
125 | ||
126 | task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; | |
127 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
128 | return 0; | |
129 | } | |
65e7ae7b | 130 | |
f19624aa OG |
131 | int iser_initialize_task_headers(struct iscsi_task *task, |
132 | struct iser_tx_desc *tx_desc) | |
133 | { | |
134 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; | |
135 | struct iser_device *device = iser_conn->ib_conn->device; | |
136 | struct iscsi_iser_task *iser_task = task->dd_data; | |
137 | u64 dma_addr; | |
138 | ||
139 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
140 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
141 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) | |
142 | return -ENOMEM; | |
143 | ||
144 | tx_desc->dma_addr = dma_addr; | |
145 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
146 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
147 | tx_desc->tx_sg[0].lkey = device->mr->lkey; | |
148 | ||
149 | iser_task->headers_initialized = 1; | |
150 | iser_task->iser_conn = iser_conn; | |
151 | return 0; | |
152 | } | |
65e7ae7b | 153 | /** |
2261ec3d MC |
154 | * iscsi_iser_task_init - Initialize task |
155 | * @task: iscsi task | |
65e7ae7b | 156 | * |
2261ec3d | 157 | * Initialize the task for the scsi command or mgmt command. |
2747fdb2 | 158 | */ |
a8ac6311 | 159 | static int |
2261ec3d | 160 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 161 | { |
2261ec3d | 162 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 163 | |
f19624aa OG |
164 | if (!iser_task->headers_initialized) |
165 | if (iser_initialize_task_headers(task, &iser_task->desc)) | |
166 | return -ENOMEM; | |
167 | ||
2261ec3d | 168 | /* mgmt task */ |
f19624aa | 169 | if (!task->sc) |
2747fdb2 | 170 | return 0; |
65e7ae7b | 171 | |
2261ec3d | 172 | iser_task->command_sent = 0; |
2261ec3d | 173 | iser_task_rdma_init(iser_task); |
a8ac6311 | 174 | return 0; |
65e7ae7b OG |
175 | } |
176 | ||
177 | /** | |
2261ec3d | 178 | * iscsi_iser_mtask_xmit - xmit management(immediate) task |
65e7ae7b | 179 | * @conn: iscsi connection |
2261ec3d | 180 | * @task: task management task |
65e7ae7b OG |
181 | * |
182 | * Notes: | |
183 | * The function can return -EAGAIN in which case caller must | |
184 | * call it again later, or recover. '0' return code means successful | |
185 | * xmit. | |
186 | * | |
187 | **/ | |
188 | static int | |
2261ec3d | 189 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
190 | { |
191 | int error = 0; | |
192 | ||
48a237a2 | 193 | iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 194 | |
2261ec3d | 195 | error = iser_send_control(conn, task); |
65e7ae7b | 196 | |
2261ec3d | 197 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
198 | * right after sending them. |
199 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
200 | * - if yes, the task is recycled at iscsi_complete_pdu |
201 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 202 | */ |
f0938401 | 203 | if (error && error != -ENOBUFS) |
65e7ae7b OG |
204 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
205 | ||
206 | return error; | |
207 | } | |
208 | ||
209 | static int | |
2747fdb2 | 210 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 211 | struct iscsi_task *task) |
65e7ae7b | 212 | { |
0f9c7449 MC |
213 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
214 | struct iscsi_data hdr; | |
65e7ae7b | 215 | int error = 0; |
65e7ae7b OG |
216 | |
217 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
218 | while (iscsi_task_has_unsol_data(task)) { |
219 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 220 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 221 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
222 | |
223 | /* the buffer description has been passed with the command */ | |
224 | /* Send the command */ | |
2261ec3d | 225 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 226 | if (error) { |
0f9c7449 | 227 | r2t->datasn--; |
2747fdb2 | 228 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 229 | } |
0f9c7449 | 230 | r2t->sent += r2t->data_count; |
48a237a2 | 231 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 232 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
233 | } |
234 | ||
2747fdb2 | 235 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
236 | return error; |
237 | } | |
238 | ||
239 | static int | |
2261ec3d | 240 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 241 | { |
2261ec3d MC |
242 | struct iscsi_conn *conn = task->conn; |
243 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
244 | int error = 0; |
245 | ||
2261ec3d MC |
246 | if (!task->sc) |
247 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 248 | |
2261ec3d MC |
249 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
250 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 251 | |
48a237a2 | 252 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 253 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 254 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
255 | } |
256 | ||
48a237a2 | 257 | iser_dbg("task deq [cid %d itt 0x%x]\n", |
2261ec3d | 258 | conn->id, task->itt); |
65e7ae7b | 259 | |
65e7ae7b | 260 | /* Send the cmd PDU */ |
2261ec3d MC |
261 | if (!iser_task->command_sent) { |
262 | error = iser_send_command(conn, task); | |
65e7ae7b | 263 | if (error) |
2747fdb2 | 264 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 265 | iser_task->command_sent = 1; |
65e7ae7b OG |
266 | } |
267 | ||
268 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 269 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 270 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 271 | |
2747fdb2 | 272 | iscsi_iser_task_xmit_exit: |
f0938401 | 273 | if (error && error != -ENOBUFS) |
65e7ae7b OG |
274 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
275 | return error; | |
276 | } | |
277 | ||
0f9c7449 | 278 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 279 | { |
2261ec3d | 280 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 281 | |
b3cd5050 MC |
282 | /* mgmt tasks do not need special cleanup */ |
283 | if (!task->sc) | |
2747fdb2 | 284 | return; |
65e7ae7b | 285 | |
2261ec3d MC |
286 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
287 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
288 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 289 | } |
65e7ae7b OG |
290 | } |
291 | ||
292 | static struct iscsi_cls_conn * | |
293 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
294 | { | |
295 | struct iscsi_conn *conn; | |
296 | struct iscsi_cls_conn *cls_conn; | |
297 | struct iscsi_iser_conn *iser_conn; | |
298 | ||
5d91e209 | 299 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); |
65e7ae7b OG |
300 | if (!cls_conn) |
301 | return NULL; | |
302 | conn = cls_conn->dd_data; | |
303 | ||
304 | /* | |
305 | * due to issues with the login code re iser sematics | |
306 | * this not set in iscsi_conn_setup - FIXME | |
307 | */ | |
bcc60c38 | 308 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 309 | |
5d91e209 | 310 | iser_conn = conn->dd_data; |
65e7ae7b OG |
311 | conn->dd_data = iser_conn; |
312 | iser_conn->iscsi_conn = conn; | |
313 | ||
314 | return cls_conn; | |
65e7ae7b OG |
315 | } |
316 | ||
317 | static void | |
318 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
319 | { | |
320 | struct iscsi_conn *conn = cls_conn->dd_data; | |
321 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
b40977d9 | 322 | struct iser_conn *ib_conn = iser_conn->ib_conn; |
65e7ae7b OG |
323 | |
324 | iscsi_conn_teardown(cls_conn); | |
b40977d9 MC |
325 | /* |
326 | * Userspace will normally call the stop callback and | |
327 | * already have freed the ib_conn, but if it goofed up then | |
328 | * we free it here. | |
329 | */ | |
330 | if (ib_conn) { | |
331 | ib_conn->iser_conn = NULL; | |
332 | iser_conn_put(ib_conn); | |
333 | } | |
65e7ae7b OG |
334 | } |
335 | ||
336 | static int | |
337 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
338 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
339 | int is_leading) | |
340 | { | |
341 | struct iscsi_conn *conn = cls_conn->dd_data; | |
342 | struct iscsi_iser_conn *iser_conn; | |
343 | struct iser_conn *ib_conn; | |
412eeafa | 344 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
345 | int error; |
346 | ||
347 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
348 | if (error) | |
349 | return error; | |
350 | ||
351 | /* the transport ep handle comes from user space so it must be | |
352 | * verified against the global ib connections list */ | |
412eeafa MC |
353 | ep = iscsi_lookup_endpoint(transport_eph); |
354 | if (!ep) { | |
65e7ae7b OG |
355 | iser_err("can't bind eph %llx\n", |
356 | (unsigned long long)transport_eph); | |
357 | return -EINVAL; | |
358 | } | |
412eeafa MC |
359 | ib_conn = ep->dd_data; |
360 | ||
65e7ae7b OG |
361 | /* binds the iSER connection retrieved from the previously |
362 | * connected ep_handle to the iSCSI layer connection. exchanges | |
363 | * connection pointers */ | |
364 | iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); | |
365 | iser_conn = conn->dd_data; | |
366 | ib_conn->iser_conn = iser_conn; | |
367 | iser_conn->ib_conn = ib_conn; | |
b40977d9 | 368 | iser_conn_get(ib_conn); |
65e7ae7b OG |
369 | return 0; |
370 | } | |
65e7ae7b | 371 | |
b40977d9 MC |
372 | static void |
373 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
374 | { | |
375 | struct iscsi_conn *conn = cls_conn->dd_data; | |
376 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
377 | struct iser_conn *ib_conn = iser_conn->ib_conn; | |
65e7ae7b | 378 | |
b40977d9 | 379 | /* |
913e5bf4 MC |
380 | * Userspace may have goofed up and not bound the connection or |
381 | * might have only partially setup the connection. | |
b40977d9 | 382 | */ |
913e5bf4 MC |
383 | if (ib_conn) { |
384 | iscsi_conn_stop(cls_conn, flag); | |
385 | /* | |
386 | * There is no unbind event so the stop callback | |
387 | * must release the ref from the bind. | |
388 | */ | |
389 | iser_conn_put(ib_conn); | |
390 | } | |
b40977d9 | 391 | iser_conn->ib_conn = NULL; |
65e7ae7b OG |
392 | } |
393 | ||
394 | static int | |
395 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
396 | { | |
397 | struct iscsi_conn *conn = cls_conn->dd_data; | |
398 | int err; | |
399 | ||
2e7a7426 | 400 | err = iser_conn_set_full_featured_mode(conn); |
65e7ae7b OG |
401 | if (err) |
402 | return err; | |
403 | ||
2e7a7426 | 404 | return iscsi_conn_start(cls_conn); |
65e7ae7b OG |
405 | } |
406 | ||
75613521 MC |
407 | static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
408 | { | |
409 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
410 | ||
e5bd7b54 | 411 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
412 | iscsi_host_remove(shost); |
413 | iscsi_host_free(shost); | |
75613521 | 414 | } |
65e7ae7b OG |
415 | |
416 | static struct iscsi_cls_session * | |
412eeafa | 417 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 418 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 419 | uint32_t initial_cmdsn) |
65e7ae7b OG |
420 | { |
421 | struct iscsi_cls_session *cls_session; | |
422 | struct iscsi_session *session; | |
412eeafa | 423 | struct Scsi_Host *shost; |
412eeafa | 424 | struct iser_conn *ib_conn; |
75613521 | 425 | |
4d108350 | 426 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1); |
75613521 MC |
427 | if (!shost) |
428 | return NULL; | |
429 | shost->transportt = iscsi_iser_scsi_transport; | |
430 | shost->max_lun = iscsi_max_lun; | |
431 | shost->max_id = 0; | |
432 | shost->max_channel = 0; | |
433 | shost->max_cmd_len = 16; | |
434 | ||
412eeafa MC |
435 | /* |
436 | * older userspace tools (before 2.0-870) did not pass us | |
437 | * the leading conn's ep so this will be NULL; | |
438 | */ | |
439 | if (ep) | |
440 | ib_conn = ep->dd_data; | |
441 | ||
442 | if (iscsi_host_add(shost, | |
443 | ep ? ib_conn->device->ib_device->dma_device : NULL)) | |
75613521 | 444 | goto free_host; |
65e7ae7b | 445 | |
1548271e MC |
446 | /* |
447 | * we do not support setting can_queue cmd_per_lun from userspace yet | |
448 | * because we preallocate so many resources | |
449 | */ | |
75613521 | 450 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b8b9e1b8 | 451 | ISCSI_DEF_XMIT_CMDS_MAX, 0, |
2261ec3d | 452 | sizeof(struct iscsi_iser_task), |
7970634b | 453 | initial_cmdsn, 0); |
65e7ae7b | 454 | if (!cls_session) |
75613521 MC |
455 | goto remove_host; |
456 | session = cls_session->dd_data; | |
65e7ae7b | 457 | |
2747fdb2 | 458 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 459 | return cls_session; |
75613521 MC |
460 | |
461 | remove_host: | |
a4804cd6 | 462 | iscsi_host_remove(shost); |
75613521 | 463 | free_host: |
a4804cd6 | 464 | iscsi_host_free(shost); |
75613521 | 465 | return NULL; |
65e7ae7b OG |
466 | } |
467 | ||
468 | static int | |
358ff019 MC |
469 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
470 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 471 | { |
358ff019 | 472 | int value; |
65e7ae7b OG |
473 | |
474 | switch (param) { | |
475 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
476 | /* TBD */ | |
477 | break; | |
65e7ae7b | 478 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 479 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
480 | if (value) { |
481 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
482 | return -EPROTO; | |
483 | } | |
484 | break; | |
485 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 486 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
487 | if (value) { |
488 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
489 | return -EPROTO; | |
490 | } | |
491 | break; | |
65e7ae7b | 492 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 493 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
494 | if (value) { |
495 | printk(KERN_ERR "IFMarker wasn't negotiated to No"); | |
496 | return -EPROTO; | |
497 | } | |
498 | break; | |
499 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 500 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
501 | if (value) { |
502 | printk(KERN_ERR "OFMarker wasn't negotiated to No"); | |
503 | return -EPROTO; | |
504 | } | |
505 | break; | |
506 | default: | |
358ff019 | 507 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
508 | } |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
65e7ae7b OG |
513 | static void |
514 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
515 | { | |
516 | struct iscsi_conn *conn = cls_conn->dd_data; | |
517 | ||
518 | stats->txdata_octets = conn->txdata_octets; | |
519 | stats->rxdata_octets = conn->rxdata_octets; | |
520 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
521 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
522 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
523 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
524 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
525 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
526 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 527 | stats->custom_length = 4; |
65e7ae7b OG |
528 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
529 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
530 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
531 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
532 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
533 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
534 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
535 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
536 | } |
537 | ||
412eeafa | 538 | static struct iscsi_endpoint * |
10eb0f01 MC |
539 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
540 | int non_blocking) | |
65e7ae7b OG |
541 | { |
542 | int err; | |
543 | struct iser_conn *ib_conn; | |
412eeafa | 544 | struct iscsi_endpoint *ep; |
65e7ae7b | 545 | |
412eeafa MC |
546 | ep = iscsi_create_endpoint(sizeof(*ib_conn)); |
547 | if (!ep) | |
548 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 549 | |
412eeafa MC |
550 | ib_conn = ep->dd_data; |
551 | ib_conn->ep = ep; | |
552 | iser_conn_init(ib_conn); | |
65e7ae7b | 553 | |
412eeafa MC |
554 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, |
555 | non_blocking); | |
556 | if (err) { | |
557 | iscsi_destroy_endpoint(ep); | |
558 | return ERR_PTR(err); | |
559 | } | |
560 | return ep; | |
65e7ae7b OG |
561 | } |
562 | ||
563 | static int | |
412eeafa | 564 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 565 | { |
412eeafa | 566 | struct iser_conn *ib_conn; |
65e7ae7b OG |
567 | int rc; |
568 | ||
412eeafa | 569 | ib_conn = ep->dd_data; |
65e7ae7b OG |
570 | rc = wait_event_interruptible_timeout(ib_conn->wait, |
571 | ib_conn->state == ISER_CONN_UP, | |
572 | msecs_to_jiffies(timeout_ms)); | |
573 | ||
574 | /* if conn establishment failed, return error code to iscsi */ | |
575 | if (!rc && | |
576 | (ib_conn->state == ISER_CONN_TERMINATING || | |
577 | ib_conn->state == ISER_CONN_DOWN)) | |
578 | rc = -1; | |
579 | ||
580 | iser_err("ib conn %p rc = %d\n", ib_conn, rc); | |
581 | ||
582 | if (rc > 0) | |
583 | return 1; /* success, this is the equivalent of POLLOUT */ | |
584 | else if (!rc) | |
585 | return 0; /* timeout */ | |
586 | else | |
587 | return rc; /* signal */ | |
588 | } | |
589 | ||
590 | static void | |
412eeafa | 591 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 592 | { |
1c83469d | 593 | struct iser_conn *ib_conn; |
65e7ae7b | 594 | |
412eeafa | 595 | ib_conn = ep->dd_data; |
b40977d9 MC |
596 | if (ib_conn->iser_conn) |
597 | /* | |
598 | * Must suspend xmit path if the ep is bound to the | |
599 | * iscsi_conn, so we know we are not accessing the ib_conn | |
600 | * when we free it. | |
601 | * | |
602 | * This may not be bound if the ep poll failed. | |
603 | */ | |
604 | iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); | |
605 | ||
65e7ae7b OG |
606 | |
607 | iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); | |
65e7ae7b OG |
608 | iser_conn_terminate(ib_conn); |
609 | } | |
610 | ||
611 | static struct scsi_host_template iscsi_iser_sht = { | |
7974392c | 612 | .module = THIS_MODULE, |
65e7ae7b OG |
613 | .name = "iSCSI Initiator over iSER, v." DRV_VER, |
614 | .queuecommand = iscsi_queuecommand, | |
6410627e | 615 | .change_queue_depth = iscsi_change_queue_depth, |
65e7ae7b | 616 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 617 | .max_sectors = 1024, |
e28f3d5b | 618 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 619 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 620 | .eh_device_reset_handler= iscsi_eh_device_reset, |
8e124525 | 621 | .eh_target_reset_handler= iscsi_eh_target_reset, |
6b5d6c44 | 622 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
623 | .use_clustering = DISABLE_CLUSTERING, |
624 | .proc_name = "iscsi_iser", | |
625 | .this_id = -1, | |
626 | }; | |
627 | ||
628 | static struct iscsi_transport iscsi_iser_transport = { | |
629 | .owner = THIS_MODULE, | |
630 | .name = "iser", | |
631 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, | |
632 | .param_mask = ISCSI_MAX_RECV_DLENGTH | | |
633 | ISCSI_MAX_XMIT_DLENGTH | | |
634 | ISCSI_HDRDGST_EN | | |
635 | ISCSI_DATADGST_EN | | |
636 | ISCSI_INITIAL_R2T_EN | | |
637 | ISCSI_MAX_R2T | | |
638 | ISCSI_IMM_DATA_EN | | |
639 | ISCSI_FIRST_BURST | | |
640 | ISCSI_MAX_BURST | | |
641 | ISCSI_PDU_INORDER_EN | | |
358ff019 MC |
642 | ISCSI_DATASEQ_INORDER_EN | |
643 | ISCSI_EXP_STATSN | | |
644 | ISCSI_PERSISTENT_PORT | | |
645 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
646 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
647 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
f6d5180c MC |
648 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
649 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | | |
b20d038d | 650 | ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO | |
88dfd340 MC |
651 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
652 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
8ad5781a | 653 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
d8196ed2 | 654 | ISCSI_HOST_NETDEV_NAME | |
8ad5781a | 655 | ISCSI_HOST_INITIATOR_NAME, |
65e7ae7b OG |
656 | /* session management */ |
657 | .create_session = iscsi_iser_session_create, | |
75613521 | 658 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
659 | /* connection management */ |
660 | .create_conn = iscsi_iser_conn_create, | |
661 | .bind_conn = iscsi_iser_conn_bind, | |
662 | .destroy_conn = iscsi_iser_conn_destroy, | |
358ff019 MC |
663 | .set_param = iscsi_iser_set_param, |
664 | .get_conn_param = iscsi_conn_get_param, | |
665 | .get_session_param = iscsi_session_get_param, | |
65e7ae7b | 666 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 667 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
668 | /* iscsi host params */ |
669 | .get_host_param = iscsi_host_get_param, | |
670 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
671 | /* IO */ |
672 | .send_pdu = iscsi_conn_send_pdu, | |
673 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
674 | .init_task = iscsi_iser_task_init, |
675 | .xmit_task = iscsi_iser_task_xmit, | |
676 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 677 | .alloc_pdu = iscsi_iser_pdu_alloc, |
65e7ae7b OG |
678 | /* recovery */ |
679 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
680 | ||
681 | .ep_connect = iscsi_iser_ep_connect, | |
682 | .ep_poll = iscsi_iser_ep_poll, | |
683 | .ep_disconnect = iscsi_iser_ep_disconnect | |
684 | }; | |
685 | ||
686 | static int __init iser_init(void) | |
687 | { | |
688 | int err; | |
689 | ||
690 | iser_dbg("Starting iSER datamover...\n"); | |
691 | ||
692 | if (iscsi_max_lun < 1) { | |
693 | printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); | |
694 | return -EINVAL; | |
695 | } | |
696 | ||
65e7ae7b OG |
697 | memset(&ig, 0, sizeof(struct iser_global)); |
698 | ||
699 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 700 | sizeof(struct iser_tx_desc), |
65e7ae7b | 701 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 702 | NULL); |
65e7ae7b OG |
703 | if (ig.desc_cache == NULL) |
704 | return -ENOMEM; | |
705 | ||
706 | /* device init is called only after the first addr resolution */ | |
707 | mutex_init(&ig.device_list_mutex); | |
708 | INIT_LIST_HEAD(&ig.device_list); | |
709 | mutex_init(&ig.connlist_mutex); | |
710 | INIT_LIST_HEAD(&ig.connlist); | |
711 | ||
75613521 MC |
712 | iscsi_iser_scsi_transport = iscsi_register_transport( |
713 | &iscsi_iser_transport); | |
714 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
715 | iser_err("iscsi_register_transport failed\n"); |
716 | err = -EINVAL; | |
717 | goto register_transport_failure; | |
718 | } | |
719 | ||
720 | return 0; | |
721 | ||
722 | register_transport_failure: | |
723 | kmem_cache_destroy(ig.desc_cache); | |
724 | ||
725 | return err; | |
726 | } | |
727 | ||
728 | static void __exit iser_exit(void) | |
729 | { | |
730 | iser_dbg("Removing iSER datamover...\n"); | |
731 | iscsi_unregister_transport(&iscsi_iser_transport); | |
732 | kmem_cache_destroy(ig.desc_cache); | |
733 | } | |
734 | ||
735 | module_init(iser_init); | |
736 | module_exit(iser_exit); |