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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> | |
5a0e3ad6 | 59 | #include <linux/slab.h> |
65e7ae7b OG |
60 | |
61 | #include <net/sock.h> | |
62 | ||
63 | #include <asm/uaccess.h> | |
64 | ||
65 | #include <scsi/scsi_cmnd.h> | |
66 | #include <scsi/scsi_device.h> | |
67 | #include <scsi/scsi_eh.h> | |
68 | #include <scsi/scsi_tcq.h> | |
69 | #include <scsi/scsi_host.h> | |
70 | #include <scsi/scsi.h> | |
71 | #include <scsi/scsi_transport_iscsi.h> | |
72 | ||
73 | #include "iscsi_iser.h" | |
74 | ||
75613521 MC |
75 | static struct scsi_host_template iscsi_iser_sht; |
76 | static struct iscsi_transport iscsi_iser_transport; | |
77 | static struct scsi_transport_template *iscsi_iser_scsi_transport; | |
78 | ||
65e7ae7b OG |
79 | static unsigned int iscsi_max_lun = 512; |
80 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
81 | ||
82 | int iser_debug_level = 0; | |
83 | ||
84 | MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover " | |
85 | "v" DRV_VER " (" DRV_DATE ")"); | |
86 | MODULE_LICENSE("Dual BSD/GPL"); | |
87 | MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); | |
88 | ||
89 | module_param_named(debug_level, iser_debug_level, int, 0644); | |
90 | MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); | |
91 | ||
92 | struct iser_global ig; | |
93 | ||
94 | void | |
95 | iscsi_iser_recv(struct iscsi_conn *conn, | |
96 | struct iscsi_hdr *hdr, char *rx_data, int rx_data_len) | |
97 | { | |
98 | int rc = 0; | |
65e7ae7b OG |
99 | int datalen; |
100 | int ahslen; | |
101 | ||
102 | /* verify PDU length */ | |
103 | datalen = ntoh24(hdr->dlength); | |
104 | if (datalen != rx_data_len) { | |
105 | printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n", | |
106 | datalen, rx_data_len); | |
107 | rc = ISCSI_ERR_DATALEN; | |
108 | goto error; | |
109 | } | |
110 | ||
111 | /* read AHS */ | |
112 | ahslen = hdr->hlength * 4; | |
113 | ||
0af967f5 | 114 | rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
65e7ae7b OG |
115 | if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
116 | goto error; | |
117 | ||
118 | return; | |
119 | error: | |
120 | iscsi_conn_failure(conn, rc); | |
121 | } | |
122 | ||
2ff79d52 | 123 | static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
0f9c7449 MC |
124 | { |
125 | struct iscsi_iser_task *iser_task = task->dd_data; | |
126 | ||
127 | task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; | |
128 | task->hdr_max = sizeof(iser_task->desc.iscsi_header); | |
129 | return 0; | |
130 | } | |
65e7ae7b | 131 | |
f19624aa OG |
132 | int iser_initialize_task_headers(struct iscsi_task *task, |
133 | struct iser_tx_desc *tx_desc) | |
134 | { | |
135 | struct iscsi_iser_conn *iser_conn = task->conn->dd_data; | |
136 | struct iser_device *device = iser_conn->ib_conn->device; | |
137 | struct iscsi_iser_task *iser_task = task->dd_data; | |
138 | u64 dma_addr; | |
139 | ||
140 | dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, | |
141 | ISER_HEADERS_LEN, DMA_TO_DEVICE); | |
142 | if (ib_dma_mapping_error(device->ib_device, dma_addr)) | |
143 | return -ENOMEM; | |
144 | ||
145 | tx_desc->dma_addr = dma_addr; | |
146 | tx_desc->tx_sg[0].addr = tx_desc->dma_addr; | |
147 | tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; | |
148 | tx_desc->tx_sg[0].lkey = device->mr->lkey; | |
149 | ||
150 | iser_task->headers_initialized = 1; | |
151 | iser_task->iser_conn = iser_conn; | |
152 | return 0; | |
153 | } | |
65e7ae7b | 154 | /** |
2261ec3d MC |
155 | * iscsi_iser_task_init - Initialize task |
156 | * @task: iscsi task | |
65e7ae7b | 157 | * |
2261ec3d | 158 | * Initialize the task for the scsi command or mgmt command. |
2747fdb2 | 159 | */ |
a8ac6311 | 160 | static int |
2261ec3d | 161 | iscsi_iser_task_init(struct iscsi_task *task) |
65e7ae7b | 162 | { |
2261ec3d | 163 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 164 | |
f19624aa OG |
165 | if (!iser_task->headers_initialized) |
166 | if (iser_initialize_task_headers(task, &iser_task->desc)) | |
167 | return -ENOMEM; | |
168 | ||
2261ec3d | 169 | /* mgmt task */ |
f19624aa | 170 | if (!task->sc) |
2747fdb2 | 171 | return 0; |
65e7ae7b | 172 | |
2261ec3d | 173 | iser_task->command_sent = 0; |
2261ec3d | 174 | iser_task_rdma_init(iser_task); |
a8ac6311 | 175 | return 0; |
65e7ae7b OG |
176 | } |
177 | ||
178 | /** | |
2261ec3d | 179 | * iscsi_iser_mtask_xmit - xmit management(immediate) task |
65e7ae7b | 180 | * @conn: iscsi connection |
2261ec3d | 181 | * @task: task management task |
65e7ae7b OG |
182 | * |
183 | * Notes: | |
184 | * The function can return -EAGAIN in which case caller must | |
185 | * call it again later, or recover. '0' return code means successful | |
186 | * xmit. | |
187 | * | |
188 | **/ | |
189 | static int | |
2261ec3d | 190 | iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
65e7ae7b OG |
191 | { |
192 | int error = 0; | |
193 | ||
962b4b52 | 194 | iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
65e7ae7b | 195 | |
2261ec3d | 196 | error = iser_send_control(conn, task); |
65e7ae7b | 197 | |
2261ec3d | 198 | /* since iser xmits control with zero copy, tasks can not be recycled |
65e7ae7b OG |
199 | * right after sending them. |
200 | * The recycling scheme is based on whether a response is expected | |
2261ec3d MC |
201 | * - if yes, the task is recycled at iscsi_complete_pdu |
202 | * - if no, the task is recycled at iser_snd_completion | |
65e7ae7b | 203 | */ |
65e7ae7b OG |
204 | return error; |
205 | } | |
206 | ||
207 | static int | |
2747fdb2 | 208 | iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
2261ec3d | 209 | struct iscsi_task *task) |
65e7ae7b | 210 | { |
0f9c7449 MC |
211 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
212 | struct iscsi_data hdr; | |
65e7ae7b | 213 | int error = 0; |
65e7ae7b OG |
214 | |
215 | /* Send data-out PDUs while there's still unsolicited data to send */ | |
0f9c7449 MC |
216 | while (iscsi_task_has_unsol_data(task)) { |
217 | iscsi_prep_data_out_pdu(task, r2t, &hdr); | |
48a237a2 | 218 | iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
0f9c7449 | 219 | hdr.itt, r2t->data_count); |
65e7ae7b OG |
220 | |
221 | /* the buffer description has been passed with the command */ | |
222 | /* Send the command */ | |
2261ec3d | 223 | error = iser_send_data_out(conn, task, &hdr); |
65e7ae7b | 224 | if (error) { |
0f9c7449 | 225 | r2t->datasn--; |
2747fdb2 | 226 | goto iscsi_iser_task_xmit_unsol_data_exit; |
65e7ae7b | 227 | } |
0f9c7449 | 228 | r2t->sent += r2t->data_count; |
48a237a2 | 229 | iser_dbg("Need to send %d more as data-out PDUs\n", |
0f9c7449 | 230 | r2t->data_length - r2t->sent); |
65e7ae7b OG |
231 | } |
232 | ||
2747fdb2 | 233 | iscsi_iser_task_xmit_unsol_data_exit: |
65e7ae7b OG |
234 | return error; |
235 | } | |
236 | ||
237 | static int | |
2261ec3d | 238 | iscsi_iser_task_xmit(struct iscsi_task *task) |
65e7ae7b | 239 | { |
2261ec3d MC |
240 | struct iscsi_conn *conn = task->conn; |
241 | struct iscsi_iser_task *iser_task = task->dd_data; | |
65e7ae7b OG |
242 | int error = 0; |
243 | ||
2261ec3d MC |
244 | if (!task->sc) |
245 | return iscsi_iser_mtask_xmit(conn, task); | |
2747fdb2 | 246 | |
2261ec3d MC |
247 | if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
248 | BUG_ON(scsi_bufflen(task->sc) == 0); | |
77a23c21 | 249 | |
48a237a2 | 250 | iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
2261ec3d | 251 | task->itt, scsi_bufflen(task->sc), |
0f9c7449 | 252 | task->imm_count, task->unsol_r2t.data_length); |
77a23c21 MC |
253 | } |
254 | ||
962b4b52 | 255 | iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
2261ec3d | 256 | conn->id, task->itt); |
65e7ae7b | 257 | |
65e7ae7b | 258 | /* Send the cmd PDU */ |
2261ec3d MC |
259 | if (!iser_task->command_sent) { |
260 | error = iser_send_command(conn, task); | |
65e7ae7b | 261 | if (error) |
2747fdb2 | 262 | goto iscsi_iser_task_xmit_exit; |
2261ec3d | 263 | iser_task->command_sent = 1; |
65e7ae7b OG |
264 | } |
265 | ||
266 | /* Send unsolicited data-out PDU(s) if necessary */ | |
0f9c7449 | 267 | if (iscsi_task_has_unsol_data(task)) |
2261ec3d | 268 | error = iscsi_iser_task_xmit_unsol_data(conn, task); |
65e7ae7b | 269 | |
2747fdb2 | 270 | iscsi_iser_task_xmit_exit: |
65e7ae7b OG |
271 | return error; |
272 | } | |
273 | ||
0f9c7449 | 274 | static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
65e7ae7b | 275 | { |
2261ec3d | 276 | struct iscsi_iser_task *iser_task = task->dd_data; |
65e7ae7b | 277 | |
b3cd5050 MC |
278 | /* mgmt tasks do not need special cleanup */ |
279 | if (!task->sc) | |
2747fdb2 | 280 | return; |
65e7ae7b | 281 | |
2261ec3d MC |
282 | if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
283 | iser_task->status = ISER_TASK_STATUS_COMPLETED; | |
284 | iser_task_rdma_finalize(iser_task); | |
65e7ae7b | 285 | } |
65e7ae7b OG |
286 | } |
287 | ||
288 | static struct iscsi_cls_conn * | |
289 | iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
290 | { | |
291 | struct iscsi_conn *conn; | |
292 | struct iscsi_cls_conn *cls_conn; | |
293 | struct iscsi_iser_conn *iser_conn; | |
294 | ||
5d91e209 | 295 | cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx); |
65e7ae7b OG |
296 | if (!cls_conn) |
297 | return NULL; | |
298 | conn = cls_conn->dd_data; | |
299 | ||
300 | /* | |
301 | * due to issues with the login code re iser sematics | |
302 | * this not set in iscsi_conn_setup - FIXME | |
303 | */ | |
bcc60c38 | 304 | conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
65e7ae7b | 305 | |
5d91e209 | 306 | iser_conn = conn->dd_data; |
65e7ae7b OG |
307 | conn->dd_data = iser_conn; |
308 | iser_conn->iscsi_conn = conn; | |
309 | ||
310 | return cls_conn; | |
65e7ae7b OG |
311 | } |
312 | ||
313 | static void | |
314 | iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn) | |
315 | { | |
316 | struct iscsi_conn *conn = cls_conn->dd_data; | |
317 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
b40977d9 | 318 | struct iser_conn *ib_conn = iser_conn->ib_conn; |
65e7ae7b OG |
319 | |
320 | iscsi_conn_teardown(cls_conn); | |
b40977d9 MC |
321 | /* |
322 | * Userspace will normally call the stop callback and | |
323 | * already have freed the ib_conn, but if it goofed up then | |
324 | * we free it here. | |
325 | */ | |
326 | if (ib_conn) { | |
327 | ib_conn->iser_conn = NULL; | |
328 | iser_conn_put(ib_conn); | |
329 | } | |
65e7ae7b OG |
330 | } |
331 | ||
332 | static int | |
333 | iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, | |
334 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
335 | int is_leading) | |
336 | { | |
337 | struct iscsi_conn *conn = cls_conn->dd_data; | |
338 | struct iscsi_iser_conn *iser_conn; | |
339 | struct iser_conn *ib_conn; | |
412eeafa | 340 | struct iscsi_endpoint *ep; |
65e7ae7b OG |
341 | int error; |
342 | ||
343 | error = iscsi_conn_bind(cls_session, cls_conn, is_leading); | |
344 | if (error) | |
345 | return error; | |
346 | ||
347 | /* the transport ep handle comes from user space so it must be | |
348 | * verified against the global ib connections list */ | |
412eeafa MC |
349 | ep = iscsi_lookup_endpoint(transport_eph); |
350 | if (!ep) { | |
65e7ae7b OG |
351 | iser_err("can't bind eph %llx\n", |
352 | (unsigned long long)transport_eph); | |
353 | return -EINVAL; | |
354 | } | |
412eeafa MC |
355 | ib_conn = ep->dd_data; |
356 | ||
65e7ae7b OG |
357 | /* binds the iSER connection retrieved from the previously |
358 | * connected ep_handle to the iSCSI layer connection. exchanges | |
359 | * connection pointers */ | |
360 | iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn); | |
361 | iser_conn = conn->dd_data; | |
362 | ib_conn->iser_conn = iser_conn; | |
363 | iser_conn->ib_conn = ib_conn; | |
b40977d9 | 364 | iser_conn_get(ib_conn); |
65e7ae7b OG |
365 | return 0; |
366 | } | |
65e7ae7b | 367 | |
b40977d9 MC |
368 | static void |
369 | iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
370 | { | |
371 | struct iscsi_conn *conn = cls_conn->dd_data; | |
372 | struct iscsi_iser_conn *iser_conn = conn->dd_data; | |
373 | struct iser_conn *ib_conn = iser_conn->ib_conn; | |
65e7ae7b | 374 | |
b40977d9 | 375 | /* |
913e5bf4 MC |
376 | * Userspace may have goofed up and not bound the connection or |
377 | * might have only partially setup the connection. | |
b40977d9 | 378 | */ |
913e5bf4 MC |
379 | if (ib_conn) { |
380 | iscsi_conn_stop(cls_conn, flag); | |
381 | /* | |
382 | * There is no unbind event so the stop callback | |
383 | * must release the ref from the bind. | |
384 | */ | |
385 | iser_conn_put(ib_conn); | |
386 | } | |
b40977d9 | 387 | iser_conn->ib_conn = NULL; |
65e7ae7b OG |
388 | } |
389 | ||
390 | static int | |
391 | iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) | |
392 | { | |
393 | struct iscsi_conn *conn = cls_conn->dd_data; | |
394 | int err; | |
395 | ||
2e7a7426 | 396 | err = iser_conn_set_full_featured_mode(conn); |
65e7ae7b OG |
397 | if (err) |
398 | return err; | |
399 | ||
2e7a7426 | 400 | return iscsi_conn_start(cls_conn); |
65e7ae7b OG |
401 | } |
402 | ||
75613521 MC |
403 | static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
404 | { | |
405 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
406 | ||
e5bd7b54 | 407 | iscsi_session_teardown(cls_session); |
a4804cd6 MC |
408 | iscsi_host_remove(shost); |
409 | iscsi_host_free(shost); | |
75613521 | 410 | } |
65e7ae7b OG |
411 | |
412 | static struct iscsi_cls_session * | |
412eeafa | 413 | iscsi_iser_session_create(struct iscsi_endpoint *ep, |
75613521 | 414 | uint16_t cmds_max, uint16_t qdepth, |
5e7facb7 | 415 | uint32_t initial_cmdsn) |
65e7ae7b OG |
416 | { |
417 | struct iscsi_cls_session *cls_session; | |
418 | struct iscsi_session *session; | |
412eeafa | 419 | struct Scsi_Host *shost; |
412eeafa | 420 | struct iser_conn *ib_conn; |
75613521 | 421 | |
962b4b52 | 422 | shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
75613521 MC |
423 | if (!shost) |
424 | return NULL; | |
425 | shost->transportt = iscsi_iser_scsi_transport; | |
426 | shost->max_lun = iscsi_max_lun; | |
427 | shost->max_id = 0; | |
428 | shost->max_channel = 0; | |
429 | shost->max_cmd_len = 16; | |
430 | ||
412eeafa MC |
431 | /* |
432 | * older userspace tools (before 2.0-870) did not pass us | |
433 | * the leading conn's ep so this will be NULL; | |
434 | */ | |
435 | if (ep) | |
436 | ib_conn = ep->dd_data; | |
437 | ||
438 | if (iscsi_host_add(shost, | |
439 | ep ? ib_conn->device->ib_device->dma_device : NULL)) | |
75613521 | 440 | goto free_host; |
65e7ae7b | 441 | |
1548271e MC |
442 | /* |
443 | * we do not support setting can_queue cmd_per_lun from userspace yet | |
444 | * because we preallocate so many resources | |
445 | */ | |
75613521 | 446 | cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
b8b9e1b8 | 447 | ISCSI_DEF_XMIT_CMDS_MAX, 0, |
2261ec3d | 448 | sizeof(struct iscsi_iser_task), |
7970634b | 449 | initial_cmdsn, 0); |
65e7ae7b | 450 | if (!cls_session) |
75613521 MC |
451 | goto remove_host; |
452 | session = cls_session->dd_data; | |
65e7ae7b | 453 | |
2747fdb2 | 454 | shost->can_queue = session->scsi_cmds_max; |
65e7ae7b | 455 | return cls_session; |
75613521 MC |
456 | |
457 | remove_host: | |
a4804cd6 | 458 | iscsi_host_remove(shost); |
75613521 | 459 | free_host: |
a4804cd6 | 460 | iscsi_host_free(shost); |
75613521 | 461 | return NULL; |
65e7ae7b OG |
462 | } |
463 | ||
464 | static int | |
358ff019 MC |
465 | iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
466 | enum iscsi_param param, char *buf, int buflen) | |
65e7ae7b | 467 | { |
358ff019 | 468 | int value; |
65e7ae7b OG |
469 | |
470 | switch (param) { | |
471 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
472 | /* TBD */ | |
473 | break; | |
65e7ae7b | 474 | case ISCSI_PARAM_HDRDGST_EN: |
358ff019 | 475 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
476 | if (value) { |
477 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
478 | return -EPROTO; | |
479 | } | |
480 | break; | |
481 | case ISCSI_PARAM_DATADGST_EN: | |
358ff019 | 482 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
483 | if (value) { |
484 | printk(KERN_ERR "DataDigest wasn't negotiated to None"); | |
485 | return -EPROTO; | |
486 | } | |
487 | break; | |
65e7ae7b | 488 | case ISCSI_PARAM_IFMARKER_EN: |
358ff019 | 489 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
490 | if (value) { |
491 | printk(KERN_ERR "IFMarker wasn't negotiated to No"); | |
492 | return -EPROTO; | |
493 | } | |
494 | break; | |
495 | case ISCSI_PARAM_OFMARKER_EN: | |
358ff019 | 496 | sscanf(buf, "%d", &value); |
65e7ae7b OG |
497 | if (value) { |
498 | printk(KERN_ERR "OFMarker wasn't negotiated to No"); | |
499 | return -EPROTO; | |
500 | } | |
501 | break; | |
502 | default: | |
358ff019 | 503 | return iscsi_set_param(cls_conn, param, buf, buflen); |
65e7ae7b OG |
504 | } |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
65e7ae7b OG |
509 | static void |
510 | iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) | |
511 | { | |
512 | struct iscsi_conn *conn = cls_conn->dd_data; | |
513 | ||
514 | stats->txdata_octets = conn->txdata_octets; | |
515 | stats->rxdata_octets = conn->rxdata_octets; | |
516 | stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; | |
517 | stats->dataout_pdus = conn->dataout_pdus_cnt; | |
518 | stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; | |
519 | stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ | |
520 | stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ | |
521 | stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; | |
522 | stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; | |
87528227 | 523 | stats->custom_length = 4; |
65e7ae7b OG |
524 | strcpy(stats->custom[0].desc, "qp_tx_queue_full"); |
525 | stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */ | |
526 | strcpy(stats->custom[1].desc, "fmr_map_not_avail"); | |
527 | stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */; | |
528 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); | |
529 | stats->custom[2].value = conn->eh_abort_cnt; | |
87528227 ED |
530 | strcpy(stats->custom[3].desc, "fmr_unalign_cnt"); |
531 | stats->custom[3].value = conn->fmr_unalign_cnt; | |
65e7ae7b OG |
532 | } |
533 | ||
412eeafa | 534 | static struct iscsi_endpoint * |
10eb0f01 MC |
535 | iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
536 | int non_blocking) | |
65e7ae7b OG |
537 | { |
538 | int err; | |
539 | struct iser_conn *ib_conn; | |
412eeafa | 540 | struct iscsi_endpoint *ep; |
65e7ae7b | 541 | |
412eeafa MC |
542 | ep = iscsi_create_endpoint(sizeof(*ib_conn)); |
543 | if (!ep) | |
544 | return ERR_PTR(-ENOMEM); | |
65e7ae7b | 545 | |
412eeafa MC |
546 | ib_conn = ep->dd_data; |
547 | ib_conn->ep = ep; | |
548 | iser_conn_init(ib_conn); | |
65e7ae7b | 549 | |
412eeafa MC |
550 | err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, |
551 | non_blocking); | |
552 | if (err) { | |
553 | iscsi_destroy_endpoint(ep); | |
554 | return ERR_PTR(err); | |
555 | } | |
556 | return ep; | |
65e7ae7b OG |
557 | } |
558 | ||
559 | static int | |
412eeafa | 560 | iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
65e7ae7b | 561 | { |
412eeafa | 562 | struct iser_conn *ib_conn; |
65e7ae7b OG |
563 | int rc; |
564 | ||
412eeafa | 565 | ib_conn = ep->dd_data; |
65e7ae7b OG |
566 | rc = wait_event_interruptible_timeout(ib_conn->wait, |
567 | ib_conn->state == ISER_CONN_UP, | |
568 | msecs_to_jiffies(timeout_ms)); | |
569 | ||
570 | /* if conn establishment failed, return error code to iscsi */ | |
571 | if (!rc && | |
572 | (ib_conn->state == ISER_CONN_TERMINATING || | |
573 | ib_conn->state == ISER_CONN_DOWN)) | |
574 | rc = -1; | |
575 | ||
576 | iser_err("ib conn %p rc = %d\n", ib_conn, rc); | |
577 | ||
578 | if (rc > 0) | |
579 | return 1; /* success, this is the equivalent of POLLOUT */ | |
580 | else if (!rc) | |
581 | return 0; /* timeout */ | |
582 | else | |
583 | return rc; /* signal */ | |
584 | } | |
585 | ||
586 | static void | |
412eeafa | 587 | iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
65e7ae7b | 588 | { |
1c83469d | 589 | struct iser_conn *ib_conn; |
65e7ae7b | 590 | |
412eeafa | 591 | ib_conn = ep->dd_data; |
b40977d9 MC |
592 | if (ib_conn->iser_conn) |
593 | /* | |
594 | * Must suspend xmit path if the ep is bound to the | |
595 | * iscsi_conn, so we know we are not accessing the ib_conn | |
596 | * when we free it. | |
597 | * | |
598 | * This may not be bound if the ep poll failed. | |
599 | */ | |
600 | iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn); | |
601 | ||
65e7ae7b OG |
602 | |
603 | iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state); | |
65e7ae7b OG |
604 | iser_conn_terminate(ib_conn); |
605 | } | |
606 | ||
607 | static struct scsi_host_template iscsi_iser_sht = { | |
7974392c | 608 | .module = THIS_MODULE, |
65e7ae7b OG |
609 | .name = "iSCSI Initiator over iSER, v." DRV_VER, |
610 | .queuecommand = iscsi_queuecommand, | |
6410627e | 611 | .change_queue_depth = iscsi_change_queue_depth, |
65e7ae7b | 612 | .sg_tablesize = ISCSI_ISER_SG_TABLESIZE, |
8072ec2f | 613 | .max_sectors = 1024, |
e28f3d5b | 614 | .cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
65e7ae7b | 615 | .eh_abort_handler = iscsi_eh_abort, |
90c18f3c | 616 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 617 | .eh_target_reset_handler = iscsi_eh_recover_target, |
6b5d6c44 | 618 | .target_alloc = iscsi_target_alloc, |
65e7ae7b OG |
619 | .use_clustering = DISABLE_CLUSTERING, |
620 | .proc_name = "iscsi_iser", | |
621 | .this_id = -1, | |
622 | }; | |
623 | ||
624 | static struct iscsi_transport iscsi_iser_transport = { | |
625 | .owner = THIS_MODULE, | |
626 | .name = "iser", | |
627 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T, | |
628 | .param_mask = ISCSI_MAX_RECV_DLENGTH | | |
629 | ISCSI_MAX_XMIT_DLENGTH | | |
630 | ISCSI_HDRDGST_EN | | |
631 | ISCSI_DATADGST_EN | | |
632 | ISCSI_INITIAL_R2T_EN | | |
633 | ISCSI_MAX_R2T | | |
634 | ISCSI_IMM_DATA_EN | | |
635 | ISCSI_FIRST_BURST | | |
636 | ISCSI_MAX_BURST | | |
637 | ISCSI_PDU_INORDER_EN | | |
358ff019 MC |
638 | ISCSI_DATASEQ_INORDER_EN | |
639 | ISCSI_EXP_STATSN | | |
640 | ISCSI_PERSISTENT_PORT | | |
641 | ISCSI_PERSISTENT_ADDRESS | | |
b2c64167 MC |
642 | ISCSI_TARGET_NAME | ISCSI_TPGT | |
643 | ISCSI_USERNAME | ISCSI_PASSWORD | | |
f6d5180c MC |
644 | ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN | |
645 | ISCSI_FAST_ABORT | ISCSI_ABORT_TMO | | |
b20d038d | 646 | ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO | |
88dfd340 MC |
647 | ISCSI_PING_TMO | ISCSI_RECV_TMO | |
648 | ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME, | |
8ad5781a | 649 | .host_param_mask = ISCSI_HOST_HWADDRESS | |
d8196ed2 | 650 | ISCSI_HOST_NETDEV_NAME | |
8ad5781a | 651 | ISCSI_HOST_INITIATOR_NAME, |
65e7ae7b OG |
652 | /* session management */ |
653 | .create_session = iscsi_iser_session_create, | |
75613521 | 654 | .destroy_session = iscsi_iser_session_destroy, |
65e7ae7b OG |
655 | /* connection management */ |
656 | .create_conn = iscsi_iser_conn_create, | |
657 | .bind_conn = iscsi_iser_conn_bind, | |
658 | .destroy_conn = iscsi_iser_conn_destroy, | |
358ff019 MC |
659 | .set_param = iscsi_iser_set_param, |
660 | .get_conn_param = iscsi_conn_get_param, | |
661 | .get_session_param = iscsi_session_get_param, | |
65e7ae7b | 662 | .start_conn = iscsi_iser_conn_start, |
b40977d9 | 663 | .stop_conn = iscsi_iser_conn_stop, |
0801c242 MC |
664 | /* iscsi host params */ |
665 | .get_host_param = iscsi_host_get_param, | |
666 | .set_host_param = iscsi_host_set_param, | |
65e7ae7b OG |
667 | /* IO */ |
668 | .send_pdu = iscsi_conn_send_pdu, | |
669 | .get_stats = iscsi_iser_conn_get_stats, | |
2747fdb2 MC |
670 | .init_task = iscsi_iser_task_init, |
671 | .xmit_task = iscsi_iser_task_xmit, | |
672 | .cleanup_task = iscsi_iser_cleanup_task, | |
0f9c7449 | 673 | .alloc_pdu = iscsi_iser_pdu_alloc, |
65e7ae7b OG |
674 | /* recovery */ |
675 | .session_recovery_timedout = iscsi_session_recovery_timedout, | |
676 | ||
677 | .ep_connect = iscsi_iser_ep_connect, | |
678 | .ep_poll = iscsi_iser_ep_poll, | |
679 | .ep_disconnect = iscsi_iser_ep_disconnect | |
680 | }; | |
681 | ||
682 | static int __init iser_init(void) | |
683 | { | |
684 | int err; | |
685 | ||
686 | iser_dbg("Starting iSER datamover...\n"); | |
687 | ||
688 | if (iscsi_max_lun < 1) { | |
689 | printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun); | |
690 | return -EINVAL; | |
691 | } | |
692 | ||
65e7ae7b OG |
693 | memset(&ig, 0, sizeof(struct iser_global)); |
694 | ||
695 | ig.desc_cache = kmem_cache_create("iser_descriptors", | |
f19624aa | 696 | sizeof(struct iser_tx_desc), |
65e7ae7b | 697 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 698 | NULL); |
65e7ae7b OG |
699 | if (ig.desc_cache == NULL) |
700 | return -ENOMEM; | |
701 | ||
702 | /* device init is called only after the first addr resolution */ | |
703 | mutex_init(&ig.device_list_mutex); | |
704 | INIT_LIST_HEAD(&ig.device_list); | |
705 | mutex_init(&ig.connlist_mutex); | |
706 | INIT_LIST_HEAD(&ig.connlist); | |
707 | ||
75613521 MC |
708 | iscsi_iser_scsi_transport = iscsi_register_transport( |
709 | &iscsi_iser_transport); | |
710 | if (!iscsi_iser_scsi_transport) { | |
65e7ae7b OG |
711 | iser_err("iscsi_register_transport failed\n"); |
712 | err = -EINVAL; | |
713 | goto register_transport_failure; | |
714 | } | |
715 | ||
716 | return 0; | |
717 | ||
718 | register_transport_failure: | |
719 | kmem_cache_destroy(ig.desc_cache); | |
720 | ||
721 | return err; | |
722 | } | |
723 | ||
724 | static void __exit iser_exit(void) | |
725 | { | |
726 | iser_dbg("Removing iSER datamover...\n"); | |
727 | iscsi_unregister_transport(&iscsi_iser_transport); | |
728 | kmem_cache_destroy(ig.desc_cache); | |
729 | } | |
730 | ||
731 | module_init(iser_init); | |
732 | module_exit(iser_exit); |