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. | |
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 | |
45 | * | |
46 | * | |
47 | * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $ | |
48 | */ | |
49 | ||
50 | #include <linux/types.h> | |
51 | #include <linux/list.h> | |
52 | #include <linux/hardirq.h> | |
53 | #include <linux/kfifo.h> | |
54 | #include <linux/blkdev.h> | |
55 | #include <linux/init.h> | |
56 | #include <linux/ioctl.h> | |
65e7ae7b OG |
57 | #include <linux/cdev.h> |
58 | #include <linux/in.h> | |
59 | #include <linux/net.h> | |
60 | #include <linux/scatterlist.h> | |
61 | #include <linux/delay.h> | |
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; | |
85 | ||
86 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " | |
87 | "v" DRV_VER " (" DRV_DATE ")"); | |
88 | MODULE_LICENSE("Dual BSD/GPL"); | |
89 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); | |
90 | ||
91 | module_param_named(debug_level, iser_debug_level, int, 0644); | |
92 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); | |
93 | ||
94 | struct iser_global ig; | |
95 | ||
96 | void | |
97 | iscsi_iser_recv(struct iscsi_conn *conn, | |
98 | struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) | |
99 | { | |
100 | int rc = 0; | |
65e7ae7b OG |
101 | int datalen; |
102 | int ahslen; | |
103 | ||
104 | /* verify PDU length */ | |
105 | datalen = ntoh24(hdr->dlength); | |
106 | if (datalen != rx_data_len) { | |
107 | printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", | |
108 | datalen, rx_data_len); | |
109 | rc = ISCSI_ERR_DATALEN; | |
110 | goto error; | |
111 | } | |
112 | ||
113 | /* read AHS */ | |
114 | ahslen = hdr->hlength * 4; | |
115 | ||
0af967f5 | 116 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
117 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
118 | goto error; | |
119 | ||
120 | return; | |
121 | error: | |
122 | iscsi_conn_failure(conn, rc); | |
123 | } | |
124 | ||
125 | ||
126 | /** | |
2261ec3d MC |
127 | * iscsi_iser_task_init - Initialize task |
128 | * @task: iscsi task | |
65e7ae7b | 129 | * |
2261ec3d | 130 | * Initialize the task for the scsi command or mgmt command. |
2747fdb2 | 131 | */ |
a8ac6311 | 132 | static int |
2261ec3d | 133 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 134 | { |
2261ec3d MC |
135 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; |
136 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b | 137 | |
2261ec3d MC |
138 | /* mgmt task */ |
139 | if (!task->sc) { | |
140 | iser_task->desc.data = task->data; | |
2747fdb2 MC |
141 | return 0; |
142 | } | |
143 | ||
2261ec3d MC |
144 | iser_task->command_sent = 0; |
145 | iser_task->iser_conn = iser_conn; | |
146 | iser_task_rdma_init(iser_task); | |
a8ac6311 | 147 | return 0; |
65e7ae7b OG |
148 | } |
149 | ||
150 | /** | |
2261ec3d | 151 | * iscsi_iser_mtask_xmit - xmit management(immediate) task |
65e7ae7b | 152 | * @conn: iscsi connection |
2261ec3d | 153 | * @task: task management task |
65e7ae7b OG |
154 | * |
155 | * Notes: | |
156 | * The function can return -EAGAIN in which case caller must | |
157 | * call it again later, or recover. '0' return code means successful | |
158 | * xmit. | |
159 | * | |
160 | **/ | |
161 | static int | |
2261ec3d | 162 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
163 | { |
164 | int error = 0; | |
165 | ||
2261ec3d | 166 | debug_scsi("task deq [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 167 | |
2261ec3d | 168 | error = iser_send_control(conn, task); |
65e7ae7b | 169 | |
2261ec3d | 170 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
171 | * right after sending them. |
172 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
173 | * - if yes, the task is recycled at iscsi_complete_pdu |
174 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 175 | */ |
f0938401 | 176 | if (error && error != -ENOBUFS) |
65e7ae7b OG |
177 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
178 | ||
179 | return error; | |
180 | } | |
181 | ||
182 | static int | |
2747fdb2 | 183 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 184 | struct iscsi_task *task) |
65e7ae7b OG |
185 | { |
186 | struct iscsi_data hdr; | |
187 | int error = 0; | |
65e7ae7b OG |
188 | |
189 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
2261ec3d MC |
190 | while (task->unsol_count > 0) { |
191 | iscsi_prep_unsolicit_data_pdu(task, &hdr); | |
65e7ae7b | 192 | debug_scsi("Sending data-out: itt 0x%x, data count %d\n", |
2261ec3d | 193 | hdr.itt, task->data_count); |
65e7ae7b OG |
194 | |
195 | /* the buffer description has been passed with the command */ | |
196 | /* Send the command */ | |
2261ec3d | 197 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 198 | if (error) { |
2261ec3d | 199 | task->unsol_datasn--; |
2747fdb2 | 200 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 201 | } |
2261ec3d | 202 | task->unsol_count -= task->data_count; |
65e7ae7b | 203 | debug_scsi("Need to send %d more as data-out PDUs\n", |
2261ec3d | 204 | task->unsol_count); |
65e7ae7b OG |
205 | } |
206 | ||
2747fdb2 | 207 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
208 | return error; |
209 | } | |
210 | ||
211 | static int | |
2261ec3d | 212 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 213 | { |
2261ec3d MC |
214 | struct iscsi_conn *conn = task->conn; |
215 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
216 | int error = 0; |
217 | ||
2261ec3d MC |
218 | if (!task->sc) |
219 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 220 | |
2261ec3d MC |
221 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
222 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 MC |
223 | |
224 | debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n", | |
2261ec3d MC |
225 | task->itt, scsi_bufflen(task->sc), |
226 | task->imm_count, task->unsol_count); | |
77a23c21 MC |
227 | } |
228 | ||
2261ec3d MC |
229 | debug_scsi("task deq [cid %d itt 0x%x]\n", |
230 | conn->id, task->itt); | |
65e7ae7b | 231 | |
65e7ae7b | 232 | /* Send the cmd PDU */ |
2261ec3d MC |
233 | if (!iser_task->command_sent) { |
234 | error = iser_send_command(conn, task); | |
65e7ae7b | 235 | if (error) |
2747fdb2 | 236 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 237 | iser_task->command_sent = 1; |
65e7ae7b OG |
238 | } |
239 | ||
240 | /* Send unsolicited data-out PDU(s) if necessary */ | |
2261ec3d MC |
241 | if (task->unsol_count) |
242 | error = iscsi_iser_task_xmit_unsol_data(conn, task); | |
65e7ae7b | 243 | |
2747fdb2 | 244 | iscsi_iser_task_xmit_exit: |
f0938401 | 245 | if (error && error != -ENOBUFS) |
65e7ae7b OG |
246 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
247 | return error; | |
248 | } | |
249 | ||
250 | static void | |
2261ec3d | 251 | iscsi_iser_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b | 252 | { |
2261ec3d | 253 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 254 | |
2747fdb2 | 255 | /* mgmt tasks do not need special cleanup */ |
2261ec3d | 256 | if (!task->sc) |
2747fdb2 MC |
257 | return; |
258 | ||
2261ec3d MC |
259 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
260 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
261 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b OG |
262 | } |
263 | } | |
264 | ||
265 | static struct iser_conn * | |
266 | iscsi_iser_ib_conn_lookup(__u64 ep_handle) | |
267 | { | |
268 | struct iser_conn *ib_conn; | |
269 | struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle; | |
270 | ||
271 | mutex_lock(&ig.connlist_mutex); | |
272 | list_for_each_entry(ib_conn, &ig.connlist, conn_list) { | |
273 | if (ib_conn == uib_conn) { | |
274 | mutex_unlock(&ig.connlist_mutex); | |
275 | return ib_conn; | |
276 | } | |
277 | } | |
278 | mutex_unlock(&ig.connlist_mutex); | |
279 | iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle); | |
280 | return NULL; | |
281 | } | |
282 | ||
283 | static struct iscsi_cls_conn * | |
284 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
285 | { | |
286 | struct iscsi_conn *conn; | |
287 | struct iscsi_cls_conn *cls_conn; | |
288 | struct iscsi_iser_conn *iser_conn; | |
289 | ||
5d91e209 | 290 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); |
65e7ae7b OG |
291 | if (!cls_conn) |
292 | return NULL; | |
293 | conn = cls_conn->dd_data; | |
294 | ||
295 | /* | |
296 | * due to issues with the login code re iser sematics | |
297 | * this not set in iscsi_conn_setup - FIXME | |
298 | */ | |
299 | conn->max_recv_dlength = 128; | |
300 | ||
5d91e209 | 301 | iser_conn = conn->dd_data; |
65e7ae7b OG |
302 | /* currently this is the only field which need to be initiated */ |
303 | rwlock_init(&iser_conn->lock); | |
304 | ||
305 | conn->dd_data = iser_conn; | |
306 | iser_conn->iscsi_conn = conn; | |
307 | ||
308 | return cls_conn; | |
65e7ae7b OG |
309 | } |
310 | ||
311 | static void | |
312 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
313 | { | |
314 | struct iscsi_conn *conn = cls_conn->dd_data; | |
315 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
b40977d9 | 316 | struct iser_conn *ib_conn = iser_conn->ib_conn; |
65e7ae7b | 317 | |
5d91e209 | 318 | iscsi_conn_teardown(cls_conn); |
b40977d9 MC |
319 | /* |
320 | * Userspace will normally call the stop callback and | |
321 | * already have freed the ib_conn, but if it goofed up then | |
322 | * we free it here. | |
323 | */ | |
324 | if (ib_conn) { | |
325 | ib_conn->iser_conn = NULL; | |
326 | iser_conn_put(ib_conn); | |
327 | } | |
65e7ae7b OG |
328 | } |
329 | ||
330 | static int | |
331 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
332 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
333 | int is_leading) | |
334 | { | |
335 | struct iscsi_conn *conn = cls_conn->dd_data; | |
336 | struct iscsi_iser_conn *iser_conn; | |
337 | struct iser_conn *ib_conn; | |
338 | int error; | |
339 | ||
340 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
341 | if (error) | |
342 | return error; | |
343 | ||
344 | /* the transport ep handle comes from user space so it must be | |
345 | * verified against the global ib connections list */ | |
346 | ib_conn = iscsi_iser_ib_conn_lookup(transport_eph); | |
347 | if (!ib_conn) { | |
348 | iser_err("can't bind eph %llx\n", | |
349 | (unsigned long long)transport_eph); | |
350 | return -EINVAL; | |
351 | } | |
352 | /* binds the iSER connection retrieved from the previously | |
353 | * connected ep_handle to the iSCSI layer connection. exchanges | |
354 | * connection pointers */ | |
355 | iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); | |
356 | iser_conn = conn->dd_data; | |
357 | ib_conn->iser_conn = iser_conn; | |
358 | iser_conn->ib_conn = ib_conn; | |
b40977d9 | 359 | iser_conn_get(ib_conn); |
65e7ae7b OG |
360 | |
361 | conn->recv_lock = &iser_conn->lock; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
b40977d9 MC |
366 | static void |
367 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
368 | { | |
369 | struct iscsi_conn *conn = cls_conn->dd_data; | |
370 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
371 | struct iser_conn *ib_conn = iser_conn->ib_conn; | |
372 | ||
373 | iscsi_conn_stop(cls_conn, flag); | |
374 | /* | |
375 | * There is no unbind event so the stop callback | |
376 | * must release the ref from the bind. | |
377 | */ | |
378 | iser_conn_put(ib_conn); | |
379 | iser_conn->ib_conn = NULL; | |
380 | } | |
381 | ||
65e7ae7b OG |
382 | static int |
383 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
384 | { | |
385 | struct iscsi_conn *conn = cls_conn->dd_data; | |
386 | int err; | |
387 | ||
2e7a7426 | 388 | err = iser_conn_set_full_featured_mode(conn); |
65e7ae7b OG |
389 | if (err) |
390 | return err; | |
391 | ||
2e7a7426 | 392 | return iscsi_conn_start(cls_conn); |
65e7ae7b OG |
393 | } |
394 | ||
75613521 MC |
395 | static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
396 | { | |
397 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
398 | ||
a4804cd6 MC |
399 | iscsi_host_remove(shost); |
400 | iscsi_host_free(shost); | |
75613521 | 401 | } |
65e7ae7b OG |
402 | |
403 | static struct iscsi_cls_session * | |
75613521 MC |
404 | iscsi_iser_session_create(struct Scsi_Host *shost, |
405 | uint16_t cmds_max, uint16_t qdepth, | |
406 | uint32_t initial_cmdsn, uint32_t *hostno) | |
65e7ae7b OG |
407 | { |
408 | struct iscsi_cls_session *cls_session; | |
409 | struct iscsi_session *session; | |
410 | int i; | |
2261ec3d MC |
411 | struct iscsi_task *task; |
412 | struct iscsi_iser_task *iser_task; | |
65e7ae7b | 413 | |
75613521 MC |
414 | if (shost) { |
415 | printk(KERN_ERR "iscsi_tcp: invalid shost %d.\n", | |
416 | shost->host_no); | |
417 | return NULL; | |
418 | } | |
419 | ||
a4804cd6 | 420 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN); |
75613521 MC |
421 | if (!shost) |
422 | return NULL; | |
423 | shost->transportt = iscsi_iser_scsi_transport; | |
424 | shost->max_lun = iscsi_max_lun; | |
425 | shost->max_id = 0; | |
426 | shost->max_channel = 0; | |
427 | shost->max_cmd_len = 16; | |
428 | ||
a4804cd6 | 429 | if (iscsi_host_add(shost, NULL)) |
75613521 MC |
430 | goto free_host; |
431 | *hostno = shost->host_no; | |
432 | ||
1548271e MC |
433 | /* |
434 | * we do not support setting can_queue cmd_per_lun from userspace yet | |
435 | * because we preallocate so many resources | |
436 | */ | |
75613521 | 437 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
1548271e | 438 | ISCSI_DEF_XMIT_CMDS_MAX, |
2261ec3d | 439 | sizeof(struct iscsi_iser_task), |
75613521 | 440 | initial_cmdsn); |
65e7ae7b | 441 | if (!cls_session) |
75613521 MC |
442 | goto remove_host; |
443 | session = cls_session->dd_data; | |
65e7ae7b | 444 | |
2747fdb2 | 445 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b OG |
446 | /* libiscsi setup itts, data and pool so just set desc fields */ |
447 | for (i = 0; i < session->cmds_max; i++) { | |
2261ec3d MC |
448 | task = session->cmds[i]; |
449 | iser_task = task->dd_data; | |
450 | task->hdr = (struct iscsi_cmd *)&iser_task->desc.iscsi_header; | |
451 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
65e7ae7b | 452 | } |
65e7ae7b | 453 | return cls_session; |
75613521 MC |
454 | |
455 | remove_host: | |
a4804cd6 | 456 | iscsi_host_remove(shost); |
75613521 | 457 | free_host: |
a4804cd6 | 458 | iscsi_host_free(shost); |
75613521 | 459 | return NULL; |
65e7ae7b OG |
460 | } |
461 | ||
462 | static int | |
358ff019 MC |
463 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
464 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 465 | { |
358ff019 | 466 | int value; |
65e7ae7b OG |
467 | |
468 | switch (param) { | |
469 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
470 | /* TBD */ | |
471 | break; | |
65e7ae7b | 472 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 473 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
474 | if (value) { |
475 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
476 | return -EPROTO; | |
477 | } | |
478 | break; | |
479 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 480 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
481 | if (value) { |
482 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
483 | return -EPROTO; | |
484 | } | |
485 | break; | |
65e7ae7b | 486 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 487 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
488 | if (value) { |
489 | printk(KERN_ERR "IFMarker wasn't negotiated to No"); | |
490 | return -EPROTO; | |
491 | } | |
492 | break; | |
493 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 494 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
495 | if (value) { |
496 | printk(KERN_ERR "OFMarker wasn't negotiated to No"); | |
497 | return -EPROTO; | |
498 | } | |
499 | break; | |
500 | default: | |
358ff019 | 501 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
502 | } |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
65e7ae7b OG |
507 | static void |
508 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
509 | { | |
510 | struct iscsi_conn *conn = cls_conn->dd_data; | |
511 | ||
512 | stats->txdata_octets = conn->txdata_octets; | |
513 | stats->rxdata_octets = conn->rxdata_octets; | |
514 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
515 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
516 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
517 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
518 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
519 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
520 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 521 | stats->custom_length = 4; |
65e7ae7b OG |
522 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
523 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
524 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
525 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
526 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
527 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
528 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
529 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
530 | } |
531 | ||
532 | static int | |
533 | iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking, | |
534 | __u64 *ep_handle) | |
535 | { | |
536 | int err; | |
537 | struct iser_conn *ib_conn; | |
538 | ||
539 | err = iser_conn_init(&ib_conn); | |
540 | if (err) | |
541 | goto out; | |
542 | ||
543 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking); | |
544 | if (!err) | |
545 | *ep_handle = (__u64)(unsigned long)ib_conn; | |
546 | ||
547 | out: | |
548 | return err; | |
549 | } | |
550 | ||
551 | static int | |
552 | iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms) | |
553 | { | |
554 | struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); | |
555 | int rc; | |
556 | ||
557 | if (!ib_conn) | |
558 | return -EINVAL; | |
559 | ||
560 | rc = wait_event_interruptible_timeout(ib_conn->wait, | |
561 | ib_conn->state == ISER_CONN_UP, | |
562 | msecs_to_jiffies(timeout_ms)); | |
563 | ||
564 | /* if conn establishment failed, return error code to iscsi */ | |
565 | if (!rc && | |
566 | (ib_conn->state == ISER_CONN_TERMINATING || | |
567 | ib_conn->state == ISER_CONN_DOWN)) | |
568 | rc = -1; | |
569 | ||
570 | iser_err("ib conn %p rc = %d\n", ib_conn, rc); | |
571 | ||
572 | if (rc > 0) | |
573 | return 1; /* success, this is the equivalent of POLLOUT */ | |
574 | else if (!rc) | |
575 | return 0; /* timeout */ | |
576 | else | |
577 | return rc; /* signal */ | |
578 | } | |
579 | ||
580 | static void | |
581 | iscsi_iser_ep_disconnect(__u64 ep_handle) | |
582 | { | |
1c83469d | 583 | struct iser_conn *ib_conn; |
65e7ae7b | 584 | |
1c83469d | 585 | ib_conn = iscsi_iser_ib_conn_lookup(ep_handle); |
65e7ae7b OG |
586 | if (!ib_conn) |
587 | return; | |
588 | ||
b40977d9 MC |
589 | if (ib_conn->iser_conn) |
590 | /* | |
591 | * Must suspend xmit path if the ep is bound to the | |
592 | * iscsi_conn, so we know we are not accessing the ib_conn | |
593 | * when we free it. | |
594 | * | |
595 | * This may not be bound if the ep poll failed. | |
596 | */ | |
597 | iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); | |
598 | ||
599 | ||
65e7ae7b | 600 | iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); |
65e7ae7b OG |
601 | iser_conn_terminate(ib_conn); |
602 | } | |
603 | ||
604 | static struct scsi_host_template iscsi_iser_sht = { | |
7974392c | 605 | .module = THIS_MODULE, |
65e7ae7b OG |
606 | .name = "iSCSI Initiator over iSER, v." DRV_VER, |
607 | .queuecommand = iscsi_queuecommand, | |
6410627e | 608 | .change_queue_depth = iscsi_change_queue_depth, |
1548271e | 609 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
65e7ae7b | 610 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 611 | .max_sectors = 1024, |
65e7ae7b OG |
612 | .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN, |
613 | .eh_abort_handler = iscsi_eh_abort, | |
90c18f3c | 614 | .eh_device_reset_handler= iscsi_eh_device_reset, |
65e7ae7b OG |
615 | .eh_host_reset_handler = iscsi_eh_host_reset, |
616 | .use_clustering = DISABLE_CLUSTERING, | |
617 | .proc_name = "iscsi_iser", | |
618 | .this_id = -1, | |
619 | }; | |
620 | ||
621 | static struct iscsi_transport iscsi_iser_transport = { | |
622 | .owner = THIS_MODULE, | |
623 | .name = "iser", | |
624 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, | |
625 | .param_mask = ISCSI_MAX_RECV_DLENGTH | | |
626 | ISCSI_MAX_XMIT_DLENGTH | | |
627 | ISCSI_HDRDGST_EN | | |
628 | ISCSI_DATADGST_EN | | |
629 | ISCSI_INITIAL_R2T_EN | | |
630 | ISCSI_MAX_R2T | | |
631 | ISCSI_IMM_DATA_EN | | |
632 | ISCSI_FIRST_BURST | | |
633 | ISCSI_MAX_BURST | | |
634 | ISCSI_PDU_INORDER_EN | | |
358ff019 MC |
635 | ISCSI_DATASEQ_INORDER_EN | |
636 | ISCSI_EXP_STATSN | | |
637 | ISCSI_PERSISTENT_PORT | | |
638 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
639 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
640 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
f6d5180c MC |
641 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
642 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | | |
643 | ISCSI_PING_TMO | ISCSI_RECV_TMO, | |
8ad5781a | 644 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
d8196ed2 | 645 | ISCSI_HOST_NETDEV_NAME | |
8ad5781a | 646 | ISCSI_HOST_INITIATOR_NAME, |
65e7ae7b OG |
647 | /* session management */ |
648 | .create_session = iscsi_iser_session_create, | |
75613521 | 649 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
650 | /* connection management */ |
651 | .create_conn = iscsi_iser_conn_create, | |
652 | .bind_conn = iscsi_iser_conn_bind, | |
653 | .destroy_conn = iscsi_iser_conn_destroy, | |
358ff019 MC |
654 | .set_param = iscsi_iser_set_param, |
655 | .get_conn_param = iscsi_conn_get_param, | |
656 | .get_session_param = iscsi_session_get_param, | |
65e7ae7b | 657 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 658 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
659 | /* iscsi host params */ |
660 | .get_host_param = iscsi_host_get_param, | |
661 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
662 | /* IO */ |
663 | .send_pdu = iscsi_conn_send_pdu, | |
664 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
665 | .init_task = iscsi_iser_task_init, |
666 | .xmit_task = iscsi_iser_task_xmit, | |
667 | .cleanup_task = iscsi_iser_cleanup_task, | |
65e7ae7b OG |
668 | /* recovery */ |
669 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
670 | ||
671 | .ep_connect = iscsi_iser_ep_connect, | |
672 | .ep_poll = iscsi_iser_ep_poll, | |
673 | .ep_disconnect = iscsi_iser_ep_disconnect | |
674 | }; | |
675 | ||
676 | static int __init iser_init(void) | |
677 | { | |
678 | int err; | |
679 | ||
680 | iser_dbg("Starting iSER datamover...\n"); | |
681 | ||
682 | if (iscsi_max_lun < 1) { | |
683 | printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); | |
684 | return -EINVAL; | |
685 | } | |
686 | ||
65e7ae7b OG |
687 | memset(&ig, 0, sizeof(struct iser_global)); |
688 | ||
689 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
690 | sizeof (struct iser_desc), | |
691 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 692 | NULL); |
65e7ae7b OG |
693 | if (ig.desc_cache == NULL) |
694 | return -ENOMEM; | |
695 | ||
696 | /* device init is called only after the first addr resolution */ | |
697 | mutex_init(&ig.device_list_mutex); | |
698 | INIT_LIST_HEAD(&ig.device_list); | |
699 | mutex_init(&ig.connlist_mutex); | |
700 | INIT_LIST_HEAD(&ig.connlist); | |
701 | ||
75613521 MC |
702 | iscsi_iser_scsi_transport = iscsi_register_transport( |
703 | &iscsi_iser_transport); | |
704 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
705 | iser_err("iscsi_register_transport failed\n"); |
706 | err = -EINVAL; | |
707 | goto register_transport_failure; | |
708 | } | |
709 | ||
710 | return 0; | |
711 | ||
712 | register_transport_failure: | |
713 | kmem_cache_destroy(ig.desc_cache); | |
714 | ||
715 | return err; | |
716 | } | |
717 | ||
718 | static void __exit iser_exit(void) | |
719 | { | |
720 | iser_dbg("Removing iSER datamover...\n"); | |
721 | iscsi_unregister_transport(&iscsi_iser_transport); | |
722 | kmem_cache_destroy(ig.desc_cache); | |
723 | } | |
724 | ||
725 | module_init(iser_init); | |
726 | module_exit(iser_exit); |