Commit | Line | Data |
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7ba24713 AA |
1 | /* |
2 | * iSCSI Initiator over TCP/IP Data-Path | |
3 | * | |
4 | * Copyright (C) 2004 Dmitry Yusupov | |
5 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
6 | * Copyright (C) 2005 - 2006 Mike Christie |
7 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
7ba24713 AA |
8 | * maintained by open-iscsi@googlegroups.com |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published | |
12 | * by the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * See the file COPYING included with this distribution for more details. | |
21 | * | |
22 | * Credits: | |
23 | * Christoph Hellwig | |
24 | * FUJITA Tomonori | |
25 | * Arne Redlich | |
26 | * Zhenyu Wang | |
27 | */ | |
28 | ||
29 | #include <linux/types.h> | |
7ba24713 | 30 | #include <linux/inet.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
4e7aba73 | 32 | #include <linux/file.h> |
7ba24713 AA |
33 | #include <linux/blkdev.h> |
34 | #include <linux/crypto.h> | |
35 | #include <linux/delay.h> | |
36 | #include <linux/kfifo.h> | |
37 | #include <linux/scatterlist.h> | |
acf3368f | 38 | #include <linux/module.h> |
7ba24713 AA |
39 | #include <net/tcp.h> |
40 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 41 | #include <scsi/scsi_device.h> |
7ba24713 AA |
42 | #include <scsi/scsi_host.h> |
43 | #include <scsi/scsi.h> | |
44 | #include <scsi/scsi_transport_iscsi.h> | |
45 | ||
46 | #include "iscsi_tcp.h" | |
47 | ||
38e1a8f5 MC |
48 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
49 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
50 | "Alex Aizman <itn780@yahoo.com>"); |
51 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
52 | MODULE_LICENSE("GPL"); | |
7ba24713 | 53 | |
38e1a8f5 MC |
54 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
55 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
56 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 57 | |
c0e4eaae | 58 | static unsigned int iscsi_max_lun = ~0; |
7ba24713 AA |
59 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
60 | ||
c93f87c7 MC |
61 | static int iscsi_sw_tcp_dbg; |
62 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
63 | S_IRUGO | S_IWUSR); | |
64 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
65 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
66 | ||
67 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
68 | do { \ | |
69 | if (iscsi_sw_tcp_dbg) \ | |
70 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
71 | "%s " dbg_fmt, \ | |
72 | __func__, ##arg); \ | |
73 | } while (0); | |
74 | ||
75 | ||
da32dd68 | 76 | /** |
38e1a8f5 | 77 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
78 | * @rd_desc: read descriptor |
79 | * @skb: socket buffer | |
80 | * @offset: offset in skb | |
81 | * @len: skb->len - offset | |
38e1a8f5 MC |
82 | */ |
83 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
84 | unsigned int offset, size_t len) | |
63c62f1c MC |
85 | { |
86 | struct iscsi_conn *conn = rd_desc->arg.data; | |
87 | unsigned int consumed, total_consumed = 0; | |
88 | int status; | |
89 | ||
c93f87c7 | 90 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
91 | |
92 | do { | |
93 | status = 0; | |
94 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
95 | offset += consumed; | |
96 | total_consumed += consumed; | |
97 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
98 | ||
c93f87c7 MC |
99 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
100 | skb->len - offset, status); | |
63c62f1c | 101 | return total_consumed; |
7ba24713 AA |
102 | } |
103 | ||
523eeac6 HR |
104 | /** |
105 | * iscsi_sw_sk_state_check - check socket state | |
106 | * @sk: socket | |
107 | * | |
108 | * If the socket is in CLOSE or CLOSE_WAIT we should | |
109 | * not close the connection if there is still some | |
110 | * data pending. | |
03adb5f9 MC |
111 | * |
112 | * Must be called with sk_callback_lock. | |
523eeac6 HR |
113 | */ |
114 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
115 | { | |
03adb5f9 | 116 | struct iscsi_conn *conn = sk->sk_user_data; |
523eeac6 | 117 | |
d1af8a32 MC |
118 | if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
119 | !atomic_read(&sk->sk_rmem_alloc)) { | |
120 | ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
121 | iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); | |
122 | return -ECONNRESET; | |
123 | } | |
523eeac6 HR |
124 | return 0; |
125 | } | |
126 | ||
38e1a8f5 | 127 | static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag) |
7ba24713 | 128 | { |
03adb5f9 MC |
129 | struct iscsi_conn *conn; |
130 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 AA |
131 | read_descriptor_t rd_desc; |
132 | ||
133 | read_lock(&sk->sk_callback_lock); | |
03adb5f9 MC |
134 | conn = sk->sk_user_data; |
135 | if (!conn) { | |
136 | read_unlock(&sk->sk_callback_lock); | |
137 | return; | |
138 | } | |
139 | tcp_conn = conn->dd_data; | |
7ba24713 | 140 | |
665b44ae | 141 | /* |
da32dd68 | 142 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 143 | * We set count to 1 because we want the network layer to |
da32dd68 | 144 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
145 | * handled pdus that cross buffers or pdus that still need data. |
146 | */ | |
7ba24713 | 147 | rd_desc.arg.data = conn; |
665b44ae | 148 | rd_desc.count = 1; |
38e1a8f5 | 149 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 150 | |
d1af8a32 | 151 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 152 | |
da32dd68 OK |
153 | /* If we had to (atomically) map a highmem page, |
154 | * unmap it now. */ | |
a8ac6311 | 155 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
03adb5f9 | 156 | read_unlock(&sk->sk_callback_lock); |
7ba24713 AA |
157 | } |
158 | ||
38e1a8f5 | 159 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 160 | { |
5bb0b55a | 161 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 162 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 AA |
163 | struct iscsi_conn *conn; |
164 | struct iscsi_session *session; | |
165 | void (*old_state_change)(struct sock *); | |
166 | ||
167 | read_lock(&sk->sk_callback_lock); | |
03adb5f9 MC |
168 | conn = sk->sk_user_data; |
169 | if (!conn) { | |
170 | read_unlock(&sk->sk_callback_lock); | |
171 | return; | |
172 | } | |
7ba24713 AA |
173 | session = conn->session; |
174 | ||
d1af8a32 | 175 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 176 | |
5bb0b55a | 177 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
178 | tcp_sw_conn = tcp_conn->dd_data; |
179 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 AA |
180 | |
181 | read_unlock(&sk->sk_callback_lock); | |
182 | ||
183 | old_state_change(sk); | |
184 | } | |
185 | ||
186 | /** | |
187 | * iscsi_write_space - Called when more output buffer space is available | |
188 | * @sk: socket space is available for | |
189 | **/ | |
38e1a8f5 | 190 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 191 | { |
03adb5f9 MC |
192 | struct iscsi_conn *conn; |
193 | struct iscsi_tcp_conn *tcp_conn; | |
194 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
195 | void (*old_write_space)(struct sock *); | |
196 | ||
197 | read_lock_bh(&sk->sk_callback_lock); | |
198 | conn = sk->sk_user_data; | |
199 | if (!conn) { | |
200 | read_unlock_bh(&sk->sk_callback_lock); | |
201 | return; | |
202 | } | |
203 | ||
204 | tcp_conn = conn->dd_data; | |
205 | tcp_sw_conn = tcp_conn->dd_data; | |
206 | old_write_space = tcp_sw_conn->old_write_space; | |
207 | read_unlock_bh(&sk->sk_callback_lock); | |
208 | ||
209 | old_write_space(sk); | |
5bb0b55a | 210 | |
c93f87c7 | 211 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 212 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
213 | } |
214 | ||
38e1a8f5 | 215 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 216 | { |
5bb0b55a | 217 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
218 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
219 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
220 | |
221 | /* assign new callbacks */ | |
222 | write_lock_bh(&sk->sk_callback_lock); | |
223 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
224 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
225 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
226 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
227 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
228 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
229 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
230 | write_unlock_bh(&sk->sk_callback_lock); |
231 | } | |
232 | ||
38e1a8f5 | 233 | static void |
c484a50a | 234 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 235 | { |
c484a50a AK |
236 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
237 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 238 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
239 | |
240 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
241 | write_lock_bh(&sk->sk_callback_lock); | |
242 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
243 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
244 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
245 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
7ba24713 AA |
246 | sk->sk_no_check = 0; |
247 | write_unlock_bh(&sk->sk_callback_lock); | |
248 | } | |
249 | ||
250 | /** | |
38e1a8f5 | 251 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 252 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
253 | * @segment: the buffer to transmnit |
254 | * | |
255 | * This function transmits as much of the buffer as | |
256 | * the network layer will accept, and returns the number of | |
257 | * bytes transmitted. | |
258 | * | |
259 | * If CRC hashing is enabled, the function will compute the | |
260 | * hash as it goes. When the entire segment has been transmitted, | |
261 | * it will retrieve the hash value and send it as well. | |
262 | */ | |
6df19a79 | 263 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
264 | struct iscsi_segment *segment) |
265 | { | |
6df19a79 | 266 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
267 | struct socket *sk = tcp_sw_conn->sock; |
268 | unsigned int copied = 0; | |
269 | int r = 0; | |
270 | ||
6df19a79 | 271 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
272 | struct scatterlist *sg; |
273 | unsigned int offset, copy; | |
274 | int flags = 0; | |
275 | ||
276 | r = 0; | |
277 | offset = segment->copied; | |
278 | copy = segment->size - offset; | |
279 | ||
280 | if (segment->total_copied + segment->size < segment->total_size) | |
281 | flags |= MSG_MORE; | |
282 | ||
283 | /* Use sendpage if we can; else fall back to sendmsg */ | |
284 | if (!segment->data) { | |
285 | sg = segment->sg; | |
286 | offset += segment->sg_offset + sg->offset; | |
287 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
288 | copy, flags); | |
289 | } else { | |
290 | struct msghdr msg = { .msg_flags = flags }; | |
291 | struct kvec iov = { | |
292 | .iov_base = segment->data + offset, | |
293 | .iov_len = copy | |
294 | }; | |
295 | ||
296 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
297 | } | |
298 | ||
299 | if (r < 0) { | |
300 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
301 | return r; |
302 | } | |
303 | copied += r; | |
304 | } | |
305 | return copied; | |
306 | } | |
307 | ||
308 | /** | |
309 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 310 | **/ |
38e1a8f5 | 311 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 312 | { |
5bb0b55a | 313 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
314 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
315 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
316 | unsigned int consumed = 0; |
317 | int rc = 0; | |
7ba24713 | 318 | |
a8ac6311 | 319 | while (1) { |
6df19a79 | 320 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
321 | /* |
322 | * We may not have been able to send data because the conn | |
25985edc | 323 | * is getting stopped. libiscsi will know so propagate err |
32382492 MC |
324 | * for it to do the right thing. |
325 | */ | |
326 | if (rc == -EAGAIN) | |
327 | return rc; | |
328 | else if (rc < 0) { | |
6f481e3c | 329 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 330 | goto error; |
32382492 | 331 | } else if (rc == 0) |
a8ac6311 OK |
332 | break; |
333 | ||
334 | consumed += rc; | |
335 | ||
336 | if (segment->total_copied >= segment->total_size) { | |
337 | if (segment->done != NULL) { | |
338 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 339 | if (rc != 0) |
a8ac6311 OK |
340 | goto error; |
341 | } | |
342 | } | |
3219e529 MC |
343 | } |
344 | ||
c93f87c7 | 345 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
346 | |
347 | conn->txdata_octets += consumed; | |
348 | return consumed; | |
349 | ||
350 | error: | |
351 | /* Transmit error. We could initiate error recovery | |
352 | * here. */ | |
c93f87c7 | 353 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
354 | iscsi_conn_failure(conn, rc); |
355 | return -EIO; | |
7ba24713 AA |
356 | } |
357 | ||
358 | /** | |
a8ac6311 OK |
359 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
360 | */ | |
38e1a8f5 | 361 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 362 | { |
a8ac6311 | 363 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
364 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
365 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 366 | |
a8ac6311 | 367 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
368 | } |
369 | ||
38e1a8f5 | 370 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 371 | { |
e5a7efef | 372 | struct iscsi_conn *conn = task->conn; |
9e45dd73 MC |
373 | unsigned long pflags = current->flags; |
374 | int rc = 0; | |
375 | ||
376 | current->flags |= PF_MEMALLOC; | |
a8ac6311 | 377 | |
38e1a8f5 MC |
378 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
379 | rc = iscsi_sw_tcp_xmit(conn); | |
9e45dd73 MC |
380 | if (rc == 0) { |
381 | rc = -EAGAIN; | |
382 | break; | |
383 | } | |
a8ac6311 | 384 | if (rc < 0) |
9e45dd73 MC |
385 | break; |
386 | rc = 0; | |
3219e529 | 387 | } |
7ba24713 | 388 | |
9e45dd73 MC |
389 | tsk_restore_flags(current, pflags, PF_MEMALLOC); |
390 | return rc; | |
7ba24713 AA |
391 | } |
392 | ||
a8ac6311 OK |
393 | /* |
394 | * This is called when we're done sending the header. | |
395 | * Simply copy the data_segment to the send segment, and return. | |
396 | */ | |
38e1a8f5 MC |
397 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
398 | struct iscsi_segment *segment) | |
7ba24713 | 399 | { |
38e1a8f5 MC |
400 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
401 | ||
402 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
403 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
404 | "Header done. Next segment size %u total_size %u\n", | |
405 | tcp_sw_conn->out.segment.size, | |
406 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
407 | return 0; |
408 | } | |
409 | ||
38e1a8f5 MC |
410 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
411 | size_t hdrlen) | |
a8ac6311 OK |
412 | { |
413 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 414 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 415 | |
c93f87c7 MC |
416 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
417 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
418 | |
419 | /* Clear the data segment - needs to be filled in by the | |
420 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
421 | memset(&tcp_sw_conn->out.data_segment, 0, |
422 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
423 | |
424 | /* If header digest is enabled, compute the CRC and | |
425 | * place the digest into the same buffer. We make | |
135a8ad4 | 426 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
427 | * sufficient room. |
428 | */ | |
429 | if (conn->hdrdgst_en) { | |
38e1a8f5 | 430 | iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
431 | hdr + hdrlen); |
432 | hdrlen += ISCSI_DIGEST_SIZE; | |
433 | } | |
434 | ||
435 | /* Remember header pointer for later, when we need | |
436 | * to decide whether there's a payload to go along | |
437 | * with the header. */ | |
38e1a8f5 | 438 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 439 | |
38e1a8f5 MC |
440 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
441 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
442 | } |
443 | ||
444 | /* | |
445 | * Prepare the send buffer for the payload data. | |
446 | * Padding and checksumming will all be taken care | |
447 | * of by the iscsi_segment routines. | |
448 | */ | |
449 | static int | |
38e1a8f5 MC |
450 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
451 | unsigned int count, unsigned int offset, | |
452 | unsigned int len) | |
a8ac6311 OK |
453 | { |
454 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 455 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
456 | struct hash_desc *tx_hash = NULL; |
457 | unsigned int hdr_spec_len; | |
458 | ||
c93f87c7 MC |
459 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
460 | conn->datadgst_en ? | |
461 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
462 | |
463 | /* Make sure the datalen matches what the caller | |
464 | said he would send. */ | |
38e1a8f5 | 465 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
466 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
467 | ||
468 | if (conn->datadgst_en) | |
38e1a8f5 | 469 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 470 | |
38e1a8f5 MC |
471 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
472 | sg, count, offset, len, | |
473 | NULL, tx_hash); | |
a8ac6311 OK |
474 | } |
475 | ||
476 | static void | |
38e1a8f5 | 477 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
478 | size_t len) |
479 | { | |
480 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 481 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
482 | struct hash_desc *tx_hash = NULL; |
483 | unsigned int hdr_spec_len; | |
484 | ||
c93f87c7 MC |
485 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
486 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
487 | |
488 | /* Make sure the datalen matches what the caller | |
489 | said he would send. */ | |
38e1a8f5 | 490 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
491 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
492 | ||
493 | if (conn->datadgst_en) | |
38e1a8f5 | 494 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 495 | |
38e1a8f5 | 496 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 497 | data, len, NULL, tx_hash); |
7ba24713 AA |
498 | } |
499 | ||
38e1a8f5 MC |
500 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
501 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
502 | { |
503 | struct iscsi_conn *conn = task->conn; | |
504 | int err = 0; | |
505 | ||
38e1a8f5 | 506 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
507 | |
508 | if (!count) | |
509 | return 0; | |
510 | ||
511 | if (!task->sc) | |
38e1a8f5 | 512 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
513 | else { |
514 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
515 | ||
38e1a8f5 MC |
516 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
517 | sdb->table.nents, offset, | |
518 | count); | |
e5a7efef MC |
519 | } |
520 | ||
521 | if (err) { | |
9a6510eb | 522 | /* got invalid offset/len */ |
e5a7efef MC |
523 | return -EIO; |
524 | } | |
525 | return 0; | |
526 | } | |
527 | ||
2ff79d52 | 528 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 529 | { |
135a8ad4 | 530 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 531 | |
38e1a8f5 MC |
532 | task->hdr = task->dd_data + sizeof(*tcp_task); |
533 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 534 | return 0; |
7ba24713 AA |
535 | } |
536 | ||
5bb0b55a | 537 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
538 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
539 | uint32_t conn_idx) | |
7ba24713 | 540 | { |
5bb0b55a MC |
541 | struct iscsi_conn *conn; |
542 | struct iscsi_cls_conn *cls_conn; | |
543 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 544 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 545 | |
38e1a8f5 MC |
546 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
547 | conn_idx); | |
5bb0b55a MC |
548 | if (!cls_conn) |
549 | return NULL; | |
550 | conn = cls_conn->dd_data; | |
5d91e209 | 551 | tcp_conn = conn->dd_data; |
38e1a8f5 | 552 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 553 | |
38e1a8f5 MC |
554 | tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
555 | CRYPTO_ALG_ASYNC); | |
556 | tcp_sw_conn->tx_hash.flags = 0; | |
557 | if (IS_ERR(tcp_sw_conn->tx_hash.tfm)) | |
5d91e209 | 558 | goto free_conn; |
dd8c0d95 | 559 | |
38e1a8f5 MC |
560 | tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
561 | CRYPTO_ALG_ASYNC); | |
562 | tcp_sw_conn->rx_hash.flags = 0; | |
563 | if (IS_ERR(tcp_sw_conn->rx_hash.tfm)) | |
dd8c0d95 | 564 | goto free_tx_tfm; |
38e1a8f5 | 565 | tcp_conn->rx_hash = &tcp_sw_conn->rx_hash; |
dd8c0d95 | 566 | |
5bb0b55a | 567 | return cls_conn; |
7ba24713 | 568 | |
dd8c0d95 | 569 | free_tx_tfm: |
38e1a8f5 | 570 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); |
5d91e209 | 571 | free_conn: |
322d739d MC |
572 | iscsi_conn_printk(KERN_ERR, conn, |
573 | "Could not create connection due to crc32c " | |
574 | "loading error. Make sure the crc32c " | |
575 | "module is built as a module or into the " | |
576 | "kernel\n"); | |
38e1a8f5 | 577 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 578 | return NULL; |
7ba24713 AA |
579 | } |
580 | ||
38e1a8f5 | 581 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 582 | { |
22236961 | 583 | struct iscsi_session *session = conn->session; |
1c83469d | 584 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
585 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
586 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 587 | |
22236961 | 588 | if (!sock) |
1c83469d MC |
589 | return; |
590 | ||
22236961 | 591 | sock_hold(sock->sk); |
c484a50a | 592 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 593 | sock_put(sock->sk); |
1c83469d | 594 | |
22236961 | 595 | spin_lock_bh(&session->lock); |
38e1a8f5 | 596 | tcp_sw_conn->sock = NULL; |
22236961 MC |
597 | spin_unlock_bh(&session->lock); |
598 | sockfd_put(sock); | |
1c83469d MC |
599 | } |
600 | ||
38e1a8f5 | 601 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 602 | { |
5bb0b55a MC |
603 | struct iscsi_conn *conn = cls_conn->dd_data; |
604 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 605 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 606 | |
38e1a8f5 | 607 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 608 | |
38e1a8f5 MC |
609 | if (tcp_sw_conn->tx_hash.tfm) |
610 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); | |
611 | if (tcp_sw_conn->rx_hash.tfm) | |
612 | crypto_free_hash(tcp_sw_conn->rx_hash.tfm); | |
7ba24713 | 613 | |
38e1a8f5 | 614 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 615 | } |
7ba24713 | 616 | |
38e1a8f5 | 617 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
618 | { |
619 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 620 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 621 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 622 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
623 | |
624 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 625 | if (!sock) |
913e5bf4 | 626 | return; |
1c83469d | 627 | |
8c38a295 MC |
628 | sock->sk->sk_err = EIO; |
629 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 630 | |
03adb5f9 MC |
631 | /* stop xmit side */ |
632 | iscsi_suspend_tx(conn); | |
633 | ||
634 | /* stop recv side and release socket */ | |
38e1a8f5 | 635 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
636 | |
637 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
638 | } |
639 | ||
5bb0b55a | 640 | static int |
38e1a8f5 MC |
641 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
642 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
643 | int is_leading) | |
5bb0b55a | 644 | { |
a79af8a6 | 645 | struct iscsi_session *session = cls_session->dd_data; |
5bb0b55a MC |
646 | struct iscsi_conn *conn = cls_conn->dd_data; |
647 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 648 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
649 | struct sock *sk; |
650 | struct socket *sock; | |
651 | int err; | |
7ba24713 | 652 | |
5bb0b55a | 653 | /* lookup for existing socket */ |
264faaaa | 654 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 655 | if (!sock) { |
322d739d MC |
656 | iscsi_conn_printk(KERN_ERR, conn, |
657 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 658 | return -EEXIST; |
7ba24713 AA |
659 | } |
660 | ||
5bb0b55a MC |
661 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
662 | if (err) | |
22236961 | 663 | goto free_socket; |
7ba24713 | 664 | |
a79af8a6 | 665 | spin_lock_bh(&session->lock); |
67a61114 | 666 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 667 | tcp_sw_conn->sock = sock; |
a79af8a6 | 668 | spin_unlock_bh(&session->lock); |
7ba24713 | 669 | |
67a61114 MC |
670 | /* setup Socket parameters */ |
671 | sk = sock->sk; | |
4a17fd52 | 672 | sk->sk_reuse = SK_CAN_REUSE; |
67a61114 MC |
673 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
674 | sk->sk_allocation = GFP_ATOMIC; | |
9e45dd73 | 675 | sk_set_memalloc(sk); |
7ba24713 | 676 | |
38e1a8f5 MC |
677 | iscsi_sw_tcp_conn_set_callbacks(conn); |
678 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
679 | /* |
680 | * set receive state machine into initial state | |
681 | */ | |
da32dd68 | 682 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 683 | return 0; |
22236961 MC |
684 | |
685 | free_socket: | |
686 | sockfd_put(sock); | |
687 | return err; | |
7ba24713 AA |
688 | } |
689 | ||
38e1a8f5 MC |
690 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
691 | enum iscsi_param param, char *buf, | |
692 | int buflen) | |
7ba24713 | 693 | { |
7b7232f3 | 694 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 695 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 696 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 697 | |
7ba24713 | 698 | switch(param) { |
7ba24713 | 699 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 700 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
701 | break; |
702 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 703 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
704 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
705 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 706 | break; |
7ba24713 | 707 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 708 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 709 | default: |
5c75b7fc | 710 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
711 | } |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
38e1a8f5 MC |
716 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
717 | enum iscsi_param param, char *buf) | |
7b8631b5 | 718 | { |
7b7232f3 | 719 | struct iscsi_conn *conn = cls_conn->dd_data; |
a79af8a6 MC |
720 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
721 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
722 | struct sockaddr_in6 addr; | |
723 | int rc, len; | |
7b8631b5 MC |
724 | |
725 | switch(param) { | |
fd7255f5 | 726 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 727 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 | 728 | spin_lock_bh(&conn->session->lock); |
a79af8a6 MC |
729 | if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
730 | spin_unlock_bh(&conn->session->lock); | |
731 | return -ENOTCONN; | |
732 | } | |
733 | rc = kernel_getpeername(tcp_sw_conn->sock, | |
734 | (struct sockaddr *)&addr, &len); | |
22236961 | 735 | spin_unlock_bh(&conn->session->lock); |
a79af8a6 MC |
736 | if (rc) |
737 | return rc; | |
738 | ||
739 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
740 | &addr, param, buf); | |
fd7255f5 | 741 | default: |
5c75b7fc | 742 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
743 | } |
744 | ||
a79af8a6 MC |
745 | return 0; |
746 | } | |
747 | ||
748 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
749 | enum iscsi_host_param param, char *buf) | |
750 | { | |
751 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
752 | struct iscsi_session *session = tcp_sw_host->session; | |
753 | struct iscsi_conn *conn; | |
754 | struct iscsi_tcp_conn *tcp_conn; | |
755 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
756 | struct sockaddr_in6 addr; | |
757 | int rc, len; | |
758 | ||
759 | switch (param) { | |
760 | case ISCSI_HOST_PARAM_IPADDRESS: | |
761 | spin_lock_bh(&session->lock); | |
762 | conn = session->leadconn; | |
763 | if (!conn) { | |
764 | spin_unlock_bh(&session->lock); | |
765 | return -ENOTCONN; | |
766 | } | |
767 | tcp_conn = conn->dd_data; | |
768 | ||
769 | tcp_sw_conn = tcp_conn->dd_data; | |
770 | if (!tcp_sw_conn->sock) { | |
771 | spin_unlock_bh(&session->lock); | |
772 | return -ENOTCONN; | |
773 | } | |
774 | ||
775 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
776 | (struct sockaddr *)&addr, &len); | |
777 | spin_unlock_bh(&session->lock); | |
778 | if (rc) | |
779 | return rc; | |
780 | ||
781 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
782 | &addr, param, buf); | |
783 | default: | |
784 | return iscsi_host_get_param(shost, param, buf); | |
785 | } | |
786 | ||
787 | return 0; | |
fd7255f5 MC |
788 | } |
789 | ||
7ba24713 | 790 | static void |
38e1a8f5 MC |
791 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
792 | struct iscsi_stats *stats) | |
7ba24713 | 793 | { |
7b7232f3 | 794 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 795 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 796 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 797 | |
7ba24713 AA |
798 | stats->custom_length = 3; |
799 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 800 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 801 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 802 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
803 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
804 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
805 | |
806 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
807 | } |
808 | ||
5bb0b55a | 809 | static struct iscsi_cls_session * |
38e1a8f5 | 810 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 811 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 812 | { |
5bb0b55a MC |
813 | struct iscsi_cls_session *cls_session; |
814 | struct iscsi_session *session; | |
a79af8a6 | 815 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 816 | struct Scsi_Host *shost; |
7ba24713 | 817 | |
06520ede MC |
818 | if (ep) { |
819 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
820 | return NULL; |
821 | } | |
822 | ||
a79af8a6 MC |
823 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
824 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 825 | if (!shost) |
5bb0b55a | 826 | return NULL; |
38e1a8f5 | 827 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 828 | shost->cmd_per_lun = qdepth; |
75613521 MC |
829 | shost->max_lun = iscsi_max_lun; |
830 | shost->max_id = 0; | |
831 | shost->max_channel = 0; | |
30e9ba9f | 832 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 833 | |
a4804cd6 | 834 | if (iscsi_host_add(shost, NULL)) |
75613521 | 835 | goto free_host; |
75613521 | 836 | |
38e1a8f5 | 837 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 838 | cmds_max, 0, |
38e1a8f5 MC |
839 | sizeof(struct iscsi_tcp_task) + |
840 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 841 | initial_cmdsn, 0); |
75613521 MC |
842 | if (!cls_session) |
843 | goto remove_host; | |
844 | session = cls_session->dd_data; | |
a79af8a6 MC |
845 | tcp_sw_host = iscsi_host_priv(shost); |
846 | tcp_sw_host->session = session; | |
7ba24713 | 847 | |
fbc514b4 | 848 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 849 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 850 | goto remove_session; |
5bb0b55a MC |
851 | return cls_session; |
852 | ||
75613521 | 853 | remove_session: |
5bb0b55a | 854 | iscsi_session_teardown(cls_session); |
75613521 | 855 | remove_host: |
a4804cd6 | 856 | iscsi_host_remove(shost); |
75613521 | 857 | free_host: |
a4804cd6 | 858 | iscsi_host_free(shost); |
5bb0b55a MC |
859 | return NULL; |
860 | } | |
861 | ||
38e1a8f5 | 862 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 863 | { |
75613521 MC |
864 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
865 | ||
38e1a8f5 | 866 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 867 | iscsi_session_teardown(cls_session); |
75613521 | 868 | |
a4804cd6 MC |
869 | iscsi_host_remove(shost); |
870 | iscsi_host_free(shost); | |
7ba24713 AA |
871 | } |
872 | ||
587a1f16 | 873 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
874 | { |
875 | switch (param_type) { | |
f27fb2ef MC |
876 | case ISCSI_HOST_PARAM: |
877 | switch (param) { | |
878 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
879 | case ISCSI_HOST_PARAM_HWADDRESS: | |
880 | case ISCSI_HOST_PARAM_IPADDRESS: | |
881 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
882 | return S_IRUGO; | |
883 | default: | |
884 | return 0; | |
885 | } | |
3128c6c7 MC |
886 | case ISCSI_PARAM: |
887 | switch (param) { | |
888 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
889 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
890 | case ISCSI_PARAM_HDRDGST_EN: | |
891 | case ISCSI_PARAM_DATADGST_EN: | |
892 | case ISCSI_PARAM_CONN_ADDRESS: | |
893 | case ISCSI_PARAM_CONN_PORT: | |
894 | case ISCSI_PARAM_EXP_STATSN: | |
895 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
896 | case ISCSI_PARAM_PERSISTENT_PORT: | |
897 | case ISCSI_PARAM_PING_TMO: | |
898 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
899 | case ISCSI_PARAM_INITIAL_R2T_EN: |
900 | case ISCSI_PARAM_MAX_R2T: | |
901 | case ISCSI_PARAM_IMM_DATA_EN: | |
902 | case ISCSI_PARAM_FIRST_BURST: | |
903 | case ISCSI_PARAM_MAX_BURST: | |
904 | case ISCSI_PARAM_PDU_INORDER_EN: | |
905 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
906 | case ISCSI_PARAM_ERL: | |
907 | case ISCSI_PARAM_TARGET_NAME: | |
908 | case ISCSI_PARAM_TPGT: | |
909 | case ISCSI_PARAM_USERNAME: | |
910 | case ISCSI_PARAM_PASSWORD: | |
911 | case ISCSI_PARAM_USERNAME_IN: | |
912 | case ISCSI_PARAM_PASSWORD_IN: | |
913 | case ISCSI_PARAM_FAST_ABORT: | |
914 | case ISCSI_PARAM_ABORT_TMO: | |
915 | case ISCSI_PARAM_LU_RESET_TMO: | |
916 | case ISCSI_PARAM_TGT_RESET_TMO: | |
917 | case ISCSI_PARAM_IFACE_NAME: | |
918 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
919 | return S_IRUGO; |
920 | default: | |
921 | return 0; | |
922 | } | |
923 | } | |
924 | ||
925 | return 0; | |
926 | } | |
927 | ||
091e6dbe PW |
928 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
929 | { | |
930 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
931 | return 0; | |
932 | } | |
933 | ||
38e1a8f5 | 934 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 935 | { |
b6d44fe9 | 936 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
937 | blk_queue_dma_alignment(sdev->request_queue, 0); |
938 | return 0; | |
939 | } | |
940 | ||
38e1a8f5 | 941 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 942 | .module = THIS_MODULE, |
f4246b33 | 943 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
944 | .queuecommand = iscsi_queuecommand, |
945 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 946 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 947 | .sg_tablesize = 4096, |
8231f0ed | 948 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
949 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
950 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 951 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 952 | .eh_target_reset_handler = iscsi_eh_recover_target, |
5bb0b55a | 953 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 954 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 955 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 956 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
957 | .proc_name = "iscsi_tcp", |
958 | .this_id = -1, | |
959 | }; | |
960 | ||
38e1a8f5 | 961 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
962 | .owner = THIS_MODULE, |
963 | .name = "tcp", | |
964 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
965 | | CAP_DATADGST, | |
5bb0b55a | 966 | /* session management */ |
38e1a8f5 MC |
967 | .create_session = iscsi_sw_tcp_session_create, |
968 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 969 | /* connection management */ |
38e1a8f5 MC |
970 | .create_conn = iscsi_sw_tcp_conn_create, |
971 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
972 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 973 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
974 | .set_param = iscsi_sw_tcp_conn_set_param, |
975 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 976 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 977 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 978 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 979 | /* iscsi host params */ |
a79af8a6 | 980 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 981 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 982 | /* IO */ |
7ba24713 | 983 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 984 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 985 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
986 | .init_task = iscsi_tcp_task_init, |
987 | .xmit_task = iscsi_tcp_task_xmit, | |
988 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 989 | /* low level pdu helpers */ |
38e1a8f5 MC |
990 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
991 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
992 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 993 | /* recovery */ |
30a6c652 | 994 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
995 | }; |
996 | ||
38e1a8f5 | 997 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 998 | { |
7ba24713 | 999 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1000 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1001 | iscsi_max_lun); | |
7ba24713 AA |
1002 | return -EINVAL; |
1003 | } | |
7ba24713 | 1004 | |
38e1a8f5 MC |
1005 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1006 | &iscsi_sw_tcp_transport); | |
1007 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1008 | return -ENODEV; |
7ba24713 | 1009 | |
7b8631b5 | 1010 | return 0; |
7ba24713 AA |
1011 | } |
1012 | ||
38e1a8f5 | 1013 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1014 | { |
38e1a8f5 | 1015 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1016 | } |
1017 | ||
38e1a8f5 MC |
1018 | module_init(iscsi_sw_tcp_init); |
1019 | module_exit(iscsi_sw_tcp_exit); |