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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 OG |
130 | |
131 | /** | |
2261ec3d MC |
132 | * iscsi_iser_task_init - Initialize task |
133 | * @task: iscsi task | |
65e7ae7b | 134 | * |
2261ec3d | 135 | * Initialize the task for the scsi command or mgmt command. |
2747fdb2 | 136 | */ |
a8ac6311 | 137 | static int |
2261ec3d | 138 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 139 | { |
2261ec3d MC |
140 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; |
141 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b | 142 | |
2261ec3d MC |
143 | /* mgmt task */ |
144 | if (!task->sc) { | |
145 | iser_task->desc.data = task->data; | |
2747fdb2 MC |
146 | return 0; |
147 | } | |
65e7ae7b | 148 | |
2261ec3d MC |
149 | iser_task->command_sent = 0; |
150 | iser_task->iser_conn = iser_conn; | |
151 | iser_task_rdma_init(iser_task); | |
a8ac6311 | 152 | return 0; |
65e7ae7b OG |
153 | } |
154 | ||
155 | /** | |
2261ec3d | 156 | * iscsi_iser_mtask_xmit - xmit management(immediate) task |
65e7ae7b | 157 | * @conn: iscsi connection |
2261ec3d | 158 | * @task: task management task |
65e7ae7b OG |
159 | * |
160 | * Notes: | |
161 | * The function can return -EAGAIN in which case caller must | |
162 | * call it again later, or recover. '0' return code means successful | |
163 | * xmit. | |
164 | * | |
165 | **/ | |
166 | static int | |
2261ec3d | 167 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
168 | { |
169 | int error = 0; | |
170 | ||
48a237a2 | 171 | iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 172 | |
2261ec3d | 173 | error = iser_send_control(conn, task); |
65e7ae7b | 174 | |
2261ec3d | 175 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
176 | * right after sending them. |
177 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
178 | * - if yes, the task is recycled at iscsi_complete_pdu |
179 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 180 | */ |
f0938401 | 181 | if (error && error != -ENOBUFS) |
65e7ae7b OG |
182 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
183 | ||
184 | return error; | |
185 | } | |
186 | ||
187 | static int | |
2747fdb2 | 188 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 189 | struct iscsi_task *task) |
65e7ae7b | 190 | { |
0f9c7449 MC |
191 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
192 | struct iscsi_data hdr; | |
65e7ae7b | 193 | int error = 0; |
65e7ae7b OG |
194 | |
195 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
196 | while (iscsi_task_has_unsol_data(task)) { |
197 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 198 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 199 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
200 | |
201 | /* the buffer description has been passed with the command */ | |
202 | /* Send the command */ | |
2261ec3d | 203 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 204 | if (error) { |
0f9c7449 | 205 | r2t->datasn--; |
2747fdb2 | 206 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 207 | } |
0f9c7449 | 208 | r2t->sent += r2t->data_count; |
48a237a2 | 209 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 210 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
211 | } |
212 | ||
2747fdb2 | 213 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
214 | return error; |
215 | } | |
216 | ||
217 | static int | |
2261ec3d | 218 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 219 | { |
2261ec3d MC |
220 | struct iscsi_conn *conn = task->conn; |
221 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
222 | int error = 0; |
223 | ||
2261ec3d MC |
224 | if (!task->sc) |
225 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 226 | |
2261ec3d MC |
227 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
228 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 229 | |
48a237a2 | 230 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 231 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 232 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
233 | } |
234 | ||
48a237a2 | 235 | iser_dbg("task deq [cid %d itt 0x%x]\n", |
2261ec3d | 236 | conn->id, task->itt); |
65e7ae7b | 237 | |
65e7ae7b | 238 | /* Send the cmd PDU */ |
2261ec3d MC |
239 | if (!iser_task->command_sent) { |
240 | error = iser_send_command(conn, task); | |
65e7ae7b | 241 | if (error) |
2747fdb2 | 242 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 243 | iser_task->command_sent = 1; |
65e7ae7b OG |
244 | } |
245 | ||
246 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 247 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 248 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 249 | |
2747fdb2 | 250 | iscsi_iser_task_xmit_exit: |
f0938401 | 251 | if (error && error != -ENOBUFS) |
65e7ae7b OG |
252 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
253 | return error; | |
254 | } | |
255 | ||
0f9c7449 | 256 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 257 | { |
2261ec3d | 258 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 259 | |
0f9c7449 MC |
260 | /* |
261 | * mgmt tasks do not need special cleanup and we do not | |
262 | * allocate anything in the init task callout | |
263 | */ | |
264 | if (!task->sc || task->state == ISCSI_TASK_PENDING) | |
2747fdb2 | 265 | return; |
65e7ae7b | 266 | |
2261ec3d MC |
267 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
268 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
269 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 270 | } |
65e7ae7b OG |
271 | } |
272 | ||
273 | static struct iscsi_cls_conn * | |
274 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
275 | { | |
276 | struct iscsi_conn *conn; | |
277 | struct iscsi_cls_conn *cls_conn; | |
278 | struct iscsi_iser_conn *iser_conn; | |
279 | ||
5d91e209 | 280 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); |
65e7ae7b OG |
281 | if (!cls_conn) |
282 | return NULL; | |
283 | conn = cls_conn->dd_data; | |
284 | ||
285 | /* | |
286 | * due to issues with the login code re iser sematics | |
287 | * this not set in iscsi_conn_setup - FIXME | |
288 | */ | |
289 | conn->max_recv_dlength = 128; | |
290 | ||
5d91e209 | 291 | iser_conn = conn->dd_data; |
65e7ae7b OG |
292 | conn->dd_data = iser_conn; |
293 | iser_conn->iscsi_conn = conn; | |
294 | ||
295 | return cls_conn; | |
65e7ae7b OG |
296 | } |
297 | ||
298 | static void | |
299 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
300 | { | |
301 | struct iscsi_conn *conn = cls_conn->dd_data; | |
302 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
b40977d9 | 303 | struct iser_conn *ib_conn = iser_conn->ib_conn; |
65e7ae7b OG |
304 | |
305 | iscsi_conn_teardown(cls_conn); | |
b40977d9 MC |
306 | /* |
307 | * Userspace will normally call the stop callback and | |
308 | * already have freed the ib_conn, but if it goofed up then | |
309 | * we free it here. | |
310 | */ | |
311 | if (ib_conn) { | |
312 | ib_conn->iser_conn = NULL; | |
313 | iser_conn_put(ib_conn); | |
314 | } | |
65e7ae7b OG |
315 | } |
316 | ||
317 | static int | |
318 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
319 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
320 | int is_leading) | |
321 | { | |
322 | struct iscsi_conn *conn = cls_conn->dd_data; | |
323 | struct iscsi_iser_conn *iser_conn; | |
324 | struct iser_conn *ib_conn; | |
412eeafa | 325 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
326 | int error; |
327 | ||
328 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
329 | if (error) | |
330 | return error; | |
331 | ||
332 | /* the transport ep handle comes from user space so it must be | |
333 | * verified against the global ib connections list */ | |
412eeafa MC |
334 | ep = iscsi_lookup_endpoint(transport_eph); |
335 | if (!ep) { | |
65e7ae7b OG |
336 | iser_err("can't bind eph %llx\n", |
337 | (unsigned long long)transport_eph); | |
338 | return -EINVAL; | |
339 | } | |
412eeafa MC |
340 | ib_conn = ep->dd_data; |
341 | ||
65e7ae7b OG |
342 | /* binds the iSER connection retrieved from the previously |
343 | * connected ep_handle to the iSCSI layer connection. exchanges | |
344 | * connection pointers */ | |
345 | iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); | |
346 | iser_conn = conn->dd_data; | |
347 | ib_conn->iser_conn = iser_conn; | |
348 | iser_conn->ib_conn = ib_conn; | |
b40977d9 | 349 | iser_conn_get(ib_conn); |
65e7ae7b OG |
350 | return 0; |
351 | } | |
65e7ae7b | 352 | |
b40977d9 MC |
353 | static void |
354 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
355 | { | |
356 | struct iscsi_conn *conn = cls_conn->dd_data; | |
357 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
358 | struct iser_conn *ib_conn = iser_conn->ib_conn; | |
65e7ae7b | 359 | |
b40977d9 | 360 | /* |
913e5bf4 MC |
361 | * Userspace may have goofed up and not bound the connection or |
362 | * might have only partially setup the connection. | |
b40977d9 | 363 | */ |
913e5bf4 MC |
364 | if (ib_conn) { |
365 | iscsi_conn_stop(cls_conn, flag); | |
366 | /* | |
367 | * There is no unbind event so the stop callback | |
368 | * must release the ref from the bind. | |
369 | */ | |
370 | iser_conn_put(ib_conn); | |
371 | } | |
b40977d9 | 372 | iser_conn->ib_conn = NULL; |
65e7ae7b OG |
373 | } |
374 | ||
375 | static int | |
376 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
377 | { | |
378 | struct iscsi_conn *conn = cls_conn->dd_data; | |
379 | int err; | |
380 | ||
2e7a7426 | 381 | err = iser_conn_set_full_featured_mode(conn); |
65e7ae7b OG |
382 | if (err) |
383 | return err; | |
384 | ||
2e7a7426 | 385 | return iscsi_conn_start(cls_conn); |
65e7ae7b OG |
386 | } |
387 | ||
75613521 MC |
388 | static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
389 | { | |
390 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
391 | ||
e5bd7b54 | 392 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
393 | iscsi_host_remove(shost); |
394 | iscsi_host_free(shost); | |
75613521 | 395 | } |
65e7ae7b OG |
396 | |
397 | static struct iscsi_cls_session * | |
412eeafa | 398 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 MC |
399 | uint16_t cmds_max, uint16_t qdepth, |
400 | uint32_t initial_cmdsn, uint32_t *hostno) | |
65e7ae7b OG |
401 | { |
402 | struct iscsi_cls_session *cls_session; | |
403 | struct iscsi_session *session; | |
412eeafa | 404 | struct Scsi_Host *shost; |
412eeafa | 405 | struct iser_conn *ib_conn; |
75613521 | 406 | |
32ae763e | 407 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISER_DEF_CMD_PER_LUN, 1); |
75613521 MC |
408 | if (!shost) |
409 | return NULL; | |
410 | shost->transportt = iscsi_iser_scsi_transport; | |
411 | shost->max_lun = iscsi_max_lun; | |
412 | shost->max_id = 0; | |
413 | shost->max_channel = 0; | |
414 | shost->max_cmd_len = 16; | |
415 | ||
412eeafa MC |
416 | /* |
417 | * older userspace tools (before 2.0-870) did not pass us | |
418 | * the leading conn's ep so this will be NULL; | |
419 | */ | |
420 | if (ep) | |
421 | ib_conn = ep->dd_data; | |
422 | ||
423 | if (iscsi_host_add(shost, | |
424 | ep ? ib_conn->device->ib_device->dma_device : NULL)) | |
75613521 MC |
425 | goto free_host; |
426 | *hostno = shost->host_no; | |
65e7ae7b | 427 | |
1548271e MC |
428 | /* |
429 | * we do not support setting can_queue cmd_per_lun from userspace yet | |
430 | * because we preallocate so many resources | |
431 | */ | |
75613521 | 432 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
1548271e | 433 | ISCSI_DEF_XMIT_CMDS_MAX, |
2261ec3d | 434 | sizeof(struct iscsi_iser_task), |
7970634b | 435 | initial_cmdsn, 0); |
65e7ae7b | 436 | if (!cls_session) |
75613521 MC |
437 | goto remove_host; |
438 | session = cls_session->dd_data; | |
65e7ae7b | 439 | |
2747fdb2 | 440 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 441 | return cls_session; |
75613521 MC |
442 | |
443 | remove_host: | |
a4804cd6 | 444 | iscsi_host_remove(shost); |
75613521 | 445 | free_host: |
a4804cd6 | 446 | iscsi_host_free(shost); |
75613521 | 447 | return NULL; |
65e7ae7b OG |
448 | } |
449 | ||
450 | static int | |
358ff019 MC |
451 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
452 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 453 | { |
358ff019 | 454 | int value; |
65e7ae7b OG |
455 | |
456 | switch (param) { | |
457 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
458 | /* TBD */ | |
459 | break; | |
65e7ae7b | 460 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 461 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
462 | if (value) { |
463 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
464 | return -EPROTO; | |
465 | } | |
466 | break; | |
467 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 468 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
469 | if (value) { |
470 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
471 | return -EPROTO; | |
472 | } | |
473 | break; | |
65e7ae7b | 474 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 475 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
476 | if (value) { |
477 | printk(KERN_ERR "IFMarker wasn't negotiated to No"); | |
478 | return -EPROTO; | |
479 | } | |
480 | break; | |
481 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 482 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
483 | if (value) { |
484 | printk(KERN_ERR "OFMarker wasn't negotiated to No"); | |
485 | return -EPROTO; | |
486 | } | |
487 | break; | |
488 | default: | |
358ff019 | 489 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
490 | } |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
65e7ae7b OG |
495 | static void |
496 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
497 | { | |
498 | struct iscsi_conn *conn = cls_conn->dd_data; | |
499 | ||
500 | stats->txdata_octets = conn->txdata_octets; | |
501 | stats->rxdata_octets = conn->rxdata_octets; | |
502 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
503 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
504 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
505 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
506 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
507 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
508 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 509 | stats->custom_length = 4; |
65e7ae7b OG |
510 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
511 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
512 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
513 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
514 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
515 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
516 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
517 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
518 | } |
519 | ||
412eeafa MC |
520 | static struct iscsi_endpoint * |
521 | iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking) | |
65e7ae7b OG |
522 | { |
523 | int err; | |
524 | struct iser_conn *ib_conn; | |
412eeafa | 525 | struct iscsi_endpoint *ep; |
65e7ae7b | 526 | |
412eeafa MC |
527 | ep = iscsi_create_endpoint(sizeof(*ib_conn)); |
528 | if (!ep) | |
529 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 530 | |
412eeafa MC |
531 | ib_conn = ep->dd_data; |
532 | ib_conn->ep = ep; | |
533 | iser_conn_init(ib_conn); | |
65e7ae7b | 534 | |
412eeafa MC |
535 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, |
536 | non_blocking); | |
537 | if (err) { | |
538 | iscsi_destroy_endpoint(ep); | |
539 | return ERR_PTR(err); | |
540 | } | |
541 | return ep; | |
65e7ae7b OG |
542 | } |
543 | ||
544 | static int | |
412eeafa | 545 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 546 | { |
412eeafa | 547 | struct iser_conn *ib_conn; |
65e7ae7b OG |
548 | int rc; |
549 | ||
412eeafa | 550 | ib_conn = ep->dd_data; |
65e7ae7b OG |
551 | rc = wait_event_interruptible_timeout(ib_conn->wait, |
552 | ib_conn->state == ISER_CONN_UP, | |
553 | msecs_to_jiffies(timeout_ms)); | |
554 | ||
555 | /* if conn establishment failed, return error code to iscsi */ | |
556 | if (!rc && | |
557 | (ib_conn->state == ISER_CONN_TERMINATING || | |
558 | ib_conn->state == ISER_CONN_DOWN)) | |
559 | rc = -1; | |
560 | ||
561 | iser_err("ib conn %p rc = %d\n", ib_conn, rc); | |
562 | ||
563 | if (rc > 0) | |
564 | return 1; /* success, this is the equivalent of POLLOUT */ | |
565 | else if (!rc) | |
566 | return 0; /* timeout */ | |
567 | else | |
568 | return rc; /* signal */ | |
569 | } | |
570 | ||
571 | static void | |
412eeafa | 572 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 573 | { |
1c83469d | 574 | struct iser_conn *ib_conn; |
65e7ae7b | 575 | |
412eeafa | 576 | ib_conn = ep->dd_data; |
b40977d9 MC |
577 | if (ib_conn->iser_conn) |
578 | /* | |
579 | * Must suspend xmit path if the ep is bound to the | |
580 | * iscsi_conn, so we know we are not accessing the ib_conn | |
581 | * when we free it. | |
582 | * | |
583 | * This may not be bound if the ep poll failed. | |
584 | */ | |
585 | iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); | |
586 | ||
65e7ae7b OG |
587 | |
588 | iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); | |
65e7ae7b OG |
589 | iser_conn_terminate(ib_conn); |
590 | } | |
591 | ||
592 | static struct scsi_host_template iscsi_iser_sht = { | |
7974392c | 593 | .module = THIS_MODULE, |
65e7ae7b OG |
594 | .name = "iSCSI Initiator over iSER, v." DRV_VER, |
595 | .queuecommand = iscsi_queuecommand, | |
6410627e | 596 | .change_queue_depth = iscsi_change_queue_depth, |
65e7ae7b | 597 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 598 | .max_sectors = 1024, |
e28f3d5b | 599 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 600 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 601 | .eh_device_reset_handler= iscsi_eh_device_reset, |
8e124525 | 602 | .eh_target_reset_handler= iscsi_eh_target_reset, |
65e7ae7b OG |
603 | .use_clustering = DISABLE_CLUSTERING, |
604 | .proc_name = "iscsi_iser", | |
605 | .this_id = -1, | |
606 | }; | |
607 | ||
608 | static struct iscsi_transport iscsi_iser_transport = { | |
609 | .owner = THIS_MODULE, | |
610 | .name = "iser", | |
611 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, | |
612 | .param_mask = ISCSI_MAX_RECV_DLENGTH | | |
613 | ISCSI_MAX_XMIT_DLENGTH | | |
614 | ISCSI_HDRDGST_EN | | |
615 | ISCSI_DATADGST_EN | | |
616 | ISCSI_INITIAL_R2T_EN | | |
617 | ISCSI_MAX_R2T | | |
618 | ISCSI_IMM_DATA_EN | | |
619 | ISCSI_FIRST_BURST | | |
620 | ISCSI_MAX_BURST | | |
621 | ISCSI_PDU_INORDER_EN | | |
358ff019 MC |
622 | ISCSI_DATASEQ_INORDER_EN | |
623 | ISCSI_EXP_STATSN | | |
624 | ISCSI_PERSISTENT_PORT | | |
625 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
626 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
627 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
f6d5180c MC |
628 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
629 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | | |
88dfd340 MC |
630 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
631 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
8ad5781a | 632 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
d8196ed2 | 633 | ISCSI_HOST_NETDEV_NAME | |
8ad5781a | 634 | ISCSI_HOST_INITIATOR_NAME, |
65e7ae7b OG |
635 | /* session management */ |
636 | .create_session = iscsi_iser_session_create, | |
75613521 | 637 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
638 | /* connection management */ |
639 | .create_conn = iscsi_iser_conn_create, | |
640 | .bind_conn = iscsi_iser_conn_bind, | |
641 | .destroy_conn = iscsi_iser_conn_destroy, | |
358ff019 MC |
642 | .set_param = iscsi_iser_set_param, |
643 | .get_conn_param = iscsi_conn_get_param, | |
644 | .get_session_param = iscsi_session_get_param, | |
65e7ae7b | 645 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 646 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
647 | /* iscsi host params */ |
648 | .get_host_param = iscsi_host_get_param, | |
649 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
650 | /* IO */ |
651 | .send_pdu = iscsi_conn_send_pdu, | |
652 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
653 | .init_task = iscsi_iser_task_init, |
654 | .xmit_task = iscsi_iser_task_xmit, | |
655 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 656 | .alloc_pdu = iscsi_iser_pdu_alloc, |
65e7ae7b OG |
657 | /* recovery */ |
658 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
659 | ||
660 | .ep_connect = iscsi_iser_ep_connect, | |
661 | .ep_poll = iscsi_iser_ep_poll, | |
662 | .ep_disconnect = iscsi_iser_ep_disconnect | |
663 | }; | |
664 | ||
665 | static int __init iser_init(void) | |
666 | { | |
667 | int err; | |
668 | ||
669 | iser_dbg("Starting iSER datamover...\n"); | |
670 | ||
671 | if (iscsi_max_lun < 1) { | |
672 | printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); | |
673 | return -EINVAL; | |
674 | } | |
675 | ||
65e7ae7b OG |
676 | memset(&ig, 0, sizeof(struct iser_global)); |
677 | ||
678 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
679 | sizeof (struct iser_desc), | |
680 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 681 | NULL); |
65e7ae7b OG |
682 | if (ig.desc_cache == NULL) |
683 | return -ENOMEM; | |
684 | ||
685 | /* device init is called only after the first addr resolution */ | |
686 | mutex_init(&ig.device_list_mutex); | |
687 | INIT_LIST_HEAD(&ig.device_list); | |
688 | mutex_init(&ig.connlist_mutex); | |
689 | INIT_LIST_HEAD(&ig.connlist); | |
690 | ||
75613521 MC |
691 | iscsi_iser_scsi_transport = iscsi_register_transport( |
692 | &iscsi_iser_transport); | |
693 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
694 | iser_err("iscsi_register_transport failed\n"); |
695 | err = -EINVAL; | |
696 | goto register_transport_failure; | |
697 | } | |
698 | ||
699 | return 0; | |
700 | ||
701 | register_transport_failure: | |
702 | kmem_cache_destroy(ig.desc_cache); | |
703 | ||
704 | return err; | |
705 | } | |
706 | ||
707 | static void __exit iser_exit(void) | |
708 | { | |
709 | iser_dbg("Removing iSER datamover...\n"); | |
710 | iscsi_unregister_transport(&iscsi_iser_transport); | |
711 | kmem_cache_destroy(ig.desc_cache); | |
712 | } | |
713 | ||
714 | module_init(iser_init); | |
715 | module_exit(iser_exit); |