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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> | |
38 | #include <net/tcp.h> | |
39 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 40 | #include <scsi/scsi_device.h> |
7ba24713 AA |
41 | #include <scsi/scsi_host.h> |
42 | #include <scsi/scsi.h> | |
43 | #include <scsi/scsi_transport_iscsi.h> | |
44 | ||
45 | #include "iscsi_tcp.h" | |
46 | ||
38e1a8f5 MC |
47 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
48 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
49 | "Alex Aizman <itn780@yahoo.com>"); |
50 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
51 | MODULE_LICENSE("GPL"); | |
7ba24713 | 52 | |
38e1a8f5 MC |
53 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
54 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
55 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 56 | |
7ba24713 AA |
57 | static unsigned int iscsi_max_lun = 512; |
58 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); | |
59 | ||
c93f87c7 MC |
60 | static int iscsi_sw_tcp_dbg; |
61 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
62 | S_IRUGO | S_IWUSR); | |
63 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
64 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
65 | ||
66 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
67 | do { \ | |
68 | if (iscsi_sw_tcp_dbg) \ | |
69 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
70 | "%s " dbg_fmt, \ | |
71 | __func__, ##arg); \ | |
72 | } while (0); | |
73 | ||
74 | ||
da32dd68 | 75 | /** |
38e1a8f5 | 76 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
77 | * @rd_desc: read descriptor |
78 | * @skb: socket buffer | |
79 | * @offset: offset in skb | |
80 | * @len: skb->len - offset | |
38e1a8f5 MC |
81 | */ |
82 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
83 | unsigned int offset, size_t len) | |
63c62f1c MC |
84 | { |
85 | struct iscsi_conn *conn = rd_desc->arg.data; | |
86 | unsigned int consumed, total_consumed = 0; | |
87 | int status; | |
88 | ||
c93f87c7 | 89 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
90 | |
91 | do { | |
92 | status = 0; | |
93 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
94 | offset += consumed; | |
95 | total_consumed += consumed; | |
96 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
97 | ||
c93f87c7 MC |
98 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
99 | skb->len - offset, status); | |
63c62f1c | 100 | return total_consumed; |
7ba24713 AA |
101 | } |
102 | ||
523eeac6 HR |
103 | /** |
104 | * iscsi_sw_sk_state_check - check socket state | |
105 | * @sk: socket | |
106 | * | |
107 | * If the socket is in CLOSE or CLOSE_WAIT we should | |
108 | * not close the connection if there is still some | |
109 | * data pending. | |
03adb5f9 MC |
110 | * |
111 | * Must be called with sk_callback_lock. | |
523eeac6 HR |
112 | */ |
113 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
114 | { | |
03adb5f9 | 115 | struct iscsi_conn *conn = sk->sk_user_data; |
523eeac6 | 116 | |
d1af8a32 MC |
117 | if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
118 | !atomic_read(&sk->sk_rmem_alloc)) { | |
119 | ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
120 | iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); | |
121 | return -ECONNRESET; | |
122 | } | |
523eeac6 HR |
123 | return 0; |
124 | } | |
125 | ||
38e1a8f5 | 126 | static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag) |
7ba24713 | 127 | { |
03adb5f9 MC |
128 | struct iscsi_conn *conn; |
129 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 AA |
130 | read_descriptor_t rd_desc; |
131 | ||
132 | read_lock(&sk->sk_callback_lock); | |
03adb5f9 MC |
133 | conn = sk->sk_user_data; |
134 | if (!conn) { | |
135 | read_unlock(&sk->sk_callback_lock); | |
136 | return; | |
137 | } | |
138 | tcp_conn = conn->dd_data; | |
7ba24713 | 139 | |
665b44ae | 140 | /* |
da32dd68 | 141 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 142 | * We set count to 1 because we want the network layer to |
da32dd68 | 143 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
144 | * handled pdus that cross buffers or pdus that still need data. |
145 | */ | |
7ba24713 | 146 | rd_desc.arg.data = conn; |
665b44ae | 147 | rd_desc.count = 1; |
38e1a8f5 | 148 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 149 | |
d1af8a32 | 150 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 151 | |
da32dd68 OK |
152 | /* If we had to (atomically) map a highmem page, |
153 | * unmap it now. */ | |
a8ac6311 | 154 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
03adb5f9 | 155 | read_unlock(&sk->sk_callback_lock); |
7ba24713 AA |
156 | } |
157 | ||
38e1a8f5 | 158 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 159 | { |
5bb0b55a | 160 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 161 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 AA |
162 | struct iscsi_conn *conn; |
163 | struct iscsi_session *session; | |
164 | void (*old_state_change)(struct sock *); | |
165 | ||
166 | read_lock(&sk->sk_callback_lock); | |
03adb5f9 MC |
167 | conn = sk->sk_user_data; |
168 | if (!conn) { | |
169 | read_unlock(&sk->sk_callback_lock); | |
170 | return; | |
171 | } | |
7ba24713 AA |
172 | session = conn->session; |
173 | ||
d1af8a32 | 174 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 175 | |
5bb0b55a | 176 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
177 | tcp_sw_conn = tcp_conn->dd_data; |
178 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 AA |
179 | |
180 | read_unlock(&sk->sk_callback_lock); | |
181 | ||
182 | old_state_change(sk); | |
183 | } | |
184 | ||
185 | /** | |
186 | * iscsi_write_space - Called when more output buffer space is available | |
187 | * @sk: socket space is available for | |
188 | **/ | |
38e1a8f5 | 189 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 190 | { |
03adb5f9 MC |
191 | struct iscsi_conn *conn; |
192 | struct iscsi_tcp_conn *tcp_conn; | |
193 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
194 | void (*old_write_space)(struct sock *); | |
195 | ||
196 | read_lock_bh(&sk->sk_callback_lock); | |
197 | conn = sk->sk_user_data; | |
198 | if (!conn) { | |
199 | read_unlock_bh(&sk->sk_callback_lock); | |
200 | return; | |
201 | } | |
202 | ||
203 | tcp_conn = conn->dd_data; | |
204 | tcp_sw_conn = tcp_conn->dd_data; | |
205 | old_write_space = tcp_sw_conn->old_write_space; | |
206 | read_unlock_bh(&sk->sk_callback_lock); | |
207 | ||
208 | old_write_space(sk); | |
5bb0b55a | 209 | |
c93f87c7 | 210 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 211 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
212 | } |
213 | ||
38e1a8f5 | 214 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 215 | { |
5bb0b55a | 216 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
217 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
218 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
219 | |
220 | /* assign new callbacks */ | |
221 | write_lock_bh(&sk->sk_callback_lock); | |
222 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
223 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
224 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
225 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
226 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
227 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
228 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
229 | write_unlock_bh(&sk->sk_callback_lock); |
230 | } | |
231 | ||
38e1a8f5 | 232 | static void |
c484a50a | 233 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 234 | { |
c484a50a AK |
235 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
236 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 237 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
238 | |
239 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
240 | write_lock_bh(&sk->sk_callback_lock); | |
241 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
242 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
243 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
244 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
7ba24713 AA |
245 | sk->sk_no_check = 0; |
246 | write_unlock_bh(&sk->sk_callback_lock); | |
247 | } | |
248 | ||
249 | /** | |
38e1a8f5 | 250 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 251 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
252 | * @segment: the buffer to transmnit |
253 | * | |
254 | * This function transmits as much of the buffer as | |
255 | * the network layer will accept, and returns the number of | |
256 | * bytes transmitted. | |
257 | * | |
258 | * If CRC hashing is enabled, the function will compute the | |
259 | * hash as it goes. When the entire segment has been transmitted, | |
260 | * it will retrieve the hash value and send it as well. | |
261 | */ | |
6df19a79 | 262 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
263 | struct iscsi_segment *segment) |
264 | { | |
6df19a79 | 265 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
266 | struct socket *sk = tcp_sw_conn->sock; |
267 | unsigned int copied = 0; | |
268 | int r = 0; | |
269 | ||
6df19a79 | 270 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
271 | struct scatterlist *sg; |
272 | unsigned int offset, copy; | |
273 | int flags = 0; | |
274 | ||
275 | r = 0; | |
276 | offset = segment->copied; | |
277 | copy = segment->size - offset; | |
278 | ||
279 | if (segment->total_copied + segment->size < segment->total_size) | |
280 | flags |= MSG_MORE; | |
281 | ||
282 | /* Use sendpage if we can; else fall back to sendmsg */ | |
283 | if (!segment->data) { | |
284 | sg = segment->sg; | |
285 | offset += segment->sg_offset + sg->offset; | |
286 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
287 | copy, flags); | |
288 | } else { | |
289 | struct msghdr msg = { .msg_flags = flags }; | |
290 | struct kvec iov = { | |
291 | .iov_base = segment->data + offset, | |
292 | .iov_len = copy | |
293 | }; | |
294 | ||
295 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
296 | } | |
297 | ||
298 | if (r < 0) { | |
299 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
300 | return r; |
301 | } | |
302 | copied += r; | |
303 | } | |
304 | return copied; | |
305 | } | |
306 | ||
307 | /** | |
308 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 309 | **/ |
38e1a8f5 | 310 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 311 | { |
5bb0b55a | 312 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
313 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
314 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
315 | unsigned int consumed = 0; |
316 | int rc = 0; | |
7ba24713 | 317 | |
a8ac6311 | 318 | while (1) { |
6df19a79 | 319 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
320 | /* |
321 | * We may not have been able to send data because the conn | |
25985edc | 322 | * is getting stopped. libiscsi will know so propagate err |
32382492 MC |
323 | * for it to do the right thing. |
324 | */ | |
325 | if (rc == -EAGAIN) | |
326 | return rc; | |
327 | else if (rc < 0) { | |
6f481e3c | 328 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 329 | goto error; |
32382492 | 330 | } else if (rc == 0) |
a8ac6311 OK |
331 | break; |
332 | ||
333 | consumed += rc; | |
334 | ||
335 | if (segment->total_copied >= segment->total_size) { | |
336 | if (segment->done != NULL) { | |
337 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 338 | if (rc != 0) |
a8ac6311 OK |
339 | goto error; |
340 | } | |
341 | } | |
3219e529 MC |
342 | } |
343 | ||
c93f87c7 | 344 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
345 | |
346 | conn->txdata_octets += consumed; | |
347 | return consumed; | |
348 | ||
349 | error: | |
350 | /* Transmit error. We could initiate error recovery | |
351 | * here. */ | |
c93f87c7 | 352 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
353 | iscsi_conn_failure(conn, rc); |
354 | return -EIO; | |
7ba24713 AA |
355 | } |
356 | ||
357 | /** | |
a8ac6311 OK |
358 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
359 | */ | |
38e1a8f5 | 360 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 361 | { |
a8ac6311 | 362 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
363 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
364 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 365 | |
a8ac6311 | 366 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
367 | } |
368 | ||
38e1a8f5 | 369 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 370 | { |
e5a7efef | 371 | struct iscsi_conn *conn = task->conn; |
a8ac6311 OK |
372 | int rc; |
373 | ||
38e1a8f5 MC |
374 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
375 | rc = iscsi_sw_tcp_xmit(conn); | |
a8ac6311 | 376 | if (rc == 0) |
7ba24713 | 377 | return -EAGAIN; |
a8ac6311 OK |
378 | if (rc < 0) |
379 | return rc; | |
3219e529 | 380 | } |
7ba24713 | 381 | |
a8ac6311 | 382 | return 0; |
7ba24713 AA |
383 | } |
384 | ||
a8ac6311 OK |
385 | /* |
386 | * This is called when we're done sending the header. | |
387 | * Simply copy the data_segment to the send segment, and return. | |
388 | */ | |
38e1a8f5 MC |
389 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
390 | struct iscsi_segment *segment) | |
7ba24713 | 391 | { |
38e1a8f5 MC |
392 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
393 | ||
394 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
395 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
396 | "Header done. Next segment size %u total_size %u\n", | |
397 | tcp_sw_conn->out.segment.size, | |
398 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
399 | return 0; |
400 | } | |
401 | ||
38e1a8f5 MC |
402 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
403 | size_t hdrlen) | |
a8ac6311 OK |
404 | { |
405 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 406 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 407 | |
c93f87c7 MC |
408 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
409 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
410 | |
411 | /* Clear the data segment - needs to be filled in by the | |
412 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
413 | memset(&tcp_sw_conn->out.data_segment, 0, |
414 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
415 | |
416 | /* If header digest is enabled, compute the CRC and | |
417 | * place the digest into the same buffer. We make | |
135a8ad4 | 418 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
419 | * sufficient room. |
420 | */ | |
421 | if (conn->hdrdgst_en) { | |
38e1a8f5 | 422 | iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
423 | hdr + hdrlen); |
424 | hdrlen += ISCSI_DIGEST_SIZE; | |
425 | } | |
426 | ||
427 | /* Remember header pointer for later, when we need | |
428 | * to decide whether there's a payload to go along | |
429 | * with the header. */ | |
38e1a8f5 | 430 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 431 | |
38e1a8f5 MC |
432 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
433 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
434 | } |
435 | ||
436 | /* | |
437 | * Prepare the send buffer for the payload data. | |
438 | * Padding and checksumming will all be taken care | |
439 | * of by the iscsi_segment routines. | |
440 | */ | |
441 | static int | |
38e1a8f5 MC |
442 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
443 | unsigned int count, unsigned int offset, | |
444 | unsigned int len) | |
a8ac6311 OK |
445 | { |
446 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 447 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
448 | struct hash_desc *tx_hash = NULL; |
449 | unsigned int hdr_spec_len; | |
450 | ||
c93f87c7 MC |
451 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
452 | conn->datadgst_en ? | |
453 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
454 | |
455 | /* Make sure the datalen matches what the caller | |
456 | said he would send. */ | |
38e1a8f5 | 457 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
458 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
459 | ||
460 | if (conn->datadgst_en) | |
38e1a8f5 | 461 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 462 | |
38e1a8f5 MC |
463 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
464 | sg, count, offset, len, | |
465 | NULL, tx_hash); | |
a8ac6311 OK |
466 | } |
467 | ||
468 | static void | |
38e1a8f5 | 469 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
470 | size_t len) |
471 | { | |
472 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 473 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 OK |
474 | struct hash_desc *tx_hash = NULL; |
475 | unsigned int hdr_spec_len; | |
476 | ||
c93f87c7 MC |
477 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
478 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
479 | |
480 | /* Make sure the datalen matches what the caller | |
481 | said he would send. */ | |
38e1a8f5 | 482 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
483 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
484 | ||
485 | if (conn->datadgst_en) | |
38e1a8f5 | 486 | tx_hash = &tcp_sw_conn->tx_hash; |
a8ac6311 | 487 | |
38e1a8f5 | 488 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 489 | data, len, NULL, tx_hash); |
7ba24713 AA |
490 | } |
491 | ||
38e1a8f5 MC |
492 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
493 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
494 | { |
495 | struct iscsi_conn *conn = task->conn; | |
496 | int err = 0; | |
497 | ||
38e1a8f5 | 498 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
499 | |
500 | if (!count) | |
501 | return 0; | |
502 | ||
503 | if (!task->sc) | |
38e1a8f5 | 504 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
505 | else { |
506 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
507 | ||
38e1a8f5 MC |
508 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
509 | sdb->table.nents, offset, | |
510 | count); | |
e5a7efef MC |
511 | } |
512 | ||
513 | if (err) { | |
9a6510eb | 514 | /* got invalid offset/len */ |
e5a7efef MC |
515 | return -EIO; |
516 | } | |
517 | return 0; | |
518 | } | |
519 | ||
2ff79d52 | 520 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 521 | { |
135a8ad4 | 522 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 523 | |
38e1a8f5 MC |
524 | task->hdr = task->dd_data + sizeof(*tcp_task); |
525 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 526 | return 0; |
7ba24713 AA |
527 | } |
528 | ||
5bb0b55a | 529 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
530 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
531 | uint32_t conn_idx) | |
7ba24713 | 532 | { |
5bb0b55a MC |
533 | struct iscsi_conn *conn; |
534 | struct iscsi_cls_conn *cls_conn; | |
535 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 536 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 537 | |
38e1a8f5 MC |
538 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
539 | conn_idx); | |
5bb0b55a MC |
540 | if (!cls_conn) |
541 | return NULL; | |
542 | conn = cls_conn->dd_data; | |
5d91e209 | 543 | tcp_conn = conn->dd_data; |
38e1a8f5 | 544 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 545 | |
38e1a8f5 MC |
546 | tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
547 | CRYPTO_ALG_ASYNC); | |
548 | tcp_sw_conn->tx_hash.flags = 0; | |
549 | if (IS_ERR(tcp_sw_conn->tx_hash.tfm)) | |
5d91e209 | 550 | goto free_conn; |
dd8c0d95 | 551 | |
38e1a8f5 MC |
552 | tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0, |
553 | CRYPTO_ALG_ASYNC); | |
554 | tcp_sw_conn->rx_hash.flags = 0; | |
555 | if (IS_ERR(tcp_sw_conn->rx_hash.tfm)) | |
dd8c0d95 | 556 | goto free_tx_tfm; |
38e1a8f5 | 557 | tcp_conn->rx_hash = &tcp_sw_conn->rx_hash; |
dd8c0d95 | 558 | |
5bb0b55a | 559 | return cls_conn; |
7ba24713 | 560 | |
dd8c0d95 | 561 | free_tx_tfm: |
38e1a8f5 | 562 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); |
5d91e209 | 563 | free_conn: |
322d739d MC |
564 | iscsi_conn_printk(KERN_ERR, conn, |
565 | "Could not create connection due to crc32c " | |
566 | "loading error. Make sure the crc32c " | |
567 | "module is built as a module or into the " | |
568 | "kernel\n"); | |
38e1a8f5 | 569 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 570 | return NULL; |
7ba24713 AA |
571 | } |
572 | ||
38e1a8f5 | 573 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 574 | { |
22236961 | 575 | struct iscsi_session *session = conn->session; |
1c83469d | 576 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
577 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
578 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 579 | |
22236961 | 580 | if (!sock) |
1c83469d MC |
581 | return; |
582 | ||
22236961 | 583 | sock_hold(sock->sk); |
c484a50a | 584 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 585 | sock_put(sock->sk); |
1c83469d | 586 | |
22236961 | 587 | spin_lock_bh(&session->lock); |
38e1a8f5 | 588 | tcp_sw_conn->sock = NULL; |
22236961 MC |
589 | spin_unlock_bh(&session->lock); |
590 | sockfd_put(sock); | |
1c83469d MC |
591 | } |
592 | ||
38e1a8f5 | 593 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 594 | { |
5bb0b55a MC |
595 | struct iscsi_conn *conn = cls_conn->dd_data; |
596 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 597 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 598 | |
38e1a8f5 | 599 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 600 | |
38e1a8f5 MC |
601 | if (tcp_sw_conn->tx_hash.tfm) |
602 | crypto_free_hash(tcp_sw_conn->tx_hash.tfm); | |
603 | if (tcp_sw_conn->rx_hash.tfm) | |
604 | crypto_free_hash(tcp_sw_conn->rx_hash.tfm); | |
7ba24713 | 605 | |
38e1a8f5 | 606 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 607 | } |
7ba24713 | 608 | |
38e1a8f5 | 609 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
610 | { |
611 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 612 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 613 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 614 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
615 | |
616 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 617 | if (!sock) |
913e5bf4 | 618 | return; |
1c83469d | 619 | |
8c38a295 MC |
620 | sock->sk->sk_err = EIO; |
621 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 622 | |
03adb5f9 MC |
623 | /* stop xmit side */ |
624 | iscsi_suspend_tx(conn); | |
625 | ||
626 | /* stop recv side and release socket */ | |
38e1a8f5 | 627 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
628 | |
629 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
630 | } |
631 | ||
5bb0b55a | 632 | static int |
38e1a8f5 MC |
633 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
634 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
635 | int is_leading) | |
5bb0b55a | 636 | { |
a79af8a6 | 637 | struct iscsi_session *session = cls_session->dd_data; |
5bb0b55a MC |
638 | struct iscsi_conn *conn = cls_conn->dd_data; |
639 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 640 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
641 | struct sock *sk; |
642 | struct socket *sock; | |
643 | int err; | |
7ba24713 | 644 | |
5bb0b55a | 645 | /* lookup for existing socket */ |
264faaaa | 646 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 647 | if (!sock) { |
322d739d MC |
648 | iscsi_conn_printk(KERN_ERR, conn, |
649 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 650 | return -EEXIST; |
7ba24713 AA |
651 | } |
652 | ||
5bb0b55a MC |
653 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
654 | if (err) | |
22236961 | 655 | goto free_socket; |
7ba24713 | 656 | |
a79af8a6 | 657 | spin_lock_bh(&session->lock); |
67a61114 | 658 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 659 | tcp_sw_conn->sock = sock; |
a79af8a6 | 660 | spin_unlock_bh(&session->lock); |
7ba24713 | 661 | |
67a61114 MC |
662 | /* setup Socket parameters */ |
663 | sk = sock->sk; | |
664 | sk->sk_reuse = 1; | |
665 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ | |
666 | sk->sk_allocation = GFP_ATOMIC; | |
7ba24713 | 667 | |
38e1a8f5 MC |
668 | iscsi_sw_tcp_conn_set_callbacks(conn); |
669 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
670 | /* |
671 | * set receive state machine into initial state | |
672 | */ | |
da32dd68 | 673 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 674 | return 0; |
22236961 MC |
675 | |
676 | free_socket: | |
677 | sockfd_put(sock); | |
678 | return err; | |
7ba24713 AA |
679 | } |
680 | ||
38e1a8f5 MC |
681 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
682 | enum iscsi_param param, char *buf, | |
683 | int buflen) | |
7ba24713 | 684 | { |
7b7232f3 | 685 | struct iscsi_conn *conn = cls_conn->dd_data; |
7ba24713 | 686 | struct iscsi_session *session = conn->session; |
5bb0b55a | 687 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 688 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5c75b7fc | 689 | int value; |
7ba24713 | 690 | |
7ba24713 | 691 | switch(param) { |
7ba24713 | 692 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 693 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
694 | break; |
695 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 696 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
697 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
698 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 699 | break; |
7ba24713 | 700 | case ISCSI_PARAM_MAX_R2T: |
5c75b7fc | 701 | sscanf(buf, "%d", &value); |
df93ffcd MC |
702 | if (value <= 0 || !is_power_of_2(value)) |
703 | return -EINVAL; | |
704 | if (session->max_r2t == value) | |
7ba24713 | 705 | break; |
38e1a8f5 | 706 | iscsi_tcp_r2tpool_free(session); |
5c75b7fc | 707 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 | 708 | if (iscsi_tcp_r2tpool_alloc(session)) |
7ba24713 AA |
709 | return -ENOMEM; |
710 | break; | |
7ba24713 | 711 | default: |
5c75b7fc | 712 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
713 | } |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
38e1a8f5 MC |
718 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
719 | enum iscsi_param param, char *buf) | |
7b8631b5 | 720 | { |
7b7232f3 | 721 | struct iscsi_conn *conn = cls_conn->dd_data; |
a79af8a6 MC |
722 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
723 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
724 | struct sockaddr_in6 addr; | |
725 | int rc, len; | |
7b8631b5 MC |
726 | |
727 | switch(param) { | |
fd7255f5 | 728 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 729 | case ISCSI_PARAM_CONN_ADDRESS: |
22236961 | 730 | spin_lock_bh(&conn->session->lock); |
a79af8a6 MC |
731 | if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
732 | spin_unlock_bh(&conn->session->lock); | |
733 | return -ENOTCONN; | |
734 | } | |
735 | rc = kernel_getpeername(tcp_sw_conn->sock, | |
736 | (struct sockaddr *)&addr, &len); | |
22236961 | 737 | spin_unlock_bh(&conn->session->lock); |
a79af8a6 MC |
738 | if (rc) |
739 | return rc; | |
740 | ||
741 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
742 | &addr, param, buf); | |
fd7255f5 | 743 | default: |
5c75b7fc | 744 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
745 | } |
746 | ||
a79af8a6 MC |
747 | return 0; |
748 | } | |
749 | ||
750 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
751 | enum iscsi_host_param param, char *buf) | |
752 | { | |
753 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
754 | struct iscsi_session *session = tcp_sw_host->session; | |
755 | struct iscsi_conn *conn; | |
756 | struct iscsi_tcp_conn *tcp_conn; | |
757 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
758 | struct sockaddr_in6 addr; | |
759 | int rc, len; | |
760 | ||
761 | switch (param) { | |
762 | case ISCSI_HOST_PARAM_IPADDRESS: | |
763 | spin_lock_bh(&session->lock); | |
764 | conn = session->leadconn; | |
765 | if (!conn) { | |
766 | spin_unlock_bh(&session->lock); | |
767 | return -ENOTCONN; | |
768 | } | |
769 | tcp_conn = conn->dd_data; | |
770 | ||
771 | tcp_sw_conn = tcp_conn->dd_data; | |
772 | if (!tcp_sw_conn->sock) { | |
773 | spin_unlock_bh(&session->lock); | |
774 | return -ENOTCONN; | |
775 | } | |
776 | ||
777 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
778 | (struct sockaddr *)&addr, &len); | |
779 | spin_unlock_bh(&session->lock); | |
780 | if (rc) | |
781 | return rc; | |
782 | ||
783 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
784 | &addr, param, buf); | |
785 | default: | |
786 | return iscsi_host_get_param(shost, param, buf); | |
787 | } | |
788 | ||
789 | return 0; | |
fd7255f5 MC |
790 | } |
791 | ||
7ba24713 | 792 | static void |
38e1a8f5 MC |
793 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
794 | struct iscsi_stats *stats) | |
7ba24713 | 795 | { |
7b7232f3 | 796 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 797 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 798 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 799 | |
7ba24713 AA |
800 | stats->custom_length = 3; |
801 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 802 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 803 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 804 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
805 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
806 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
807 | |
808 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
809 | } |
810 | ||
5bb0b55a | 811 | static struct iscsi_cls_session * |
38e1a8f5 | 812 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 813 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 814 | { |
5bb0b55a MC |
815 | struct iscsi_cls_session *cls_session; |
816 | struct iscsi_session *session; | |
a79af8a6 | 817 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 818 | struct Scsi_Host *shost; |
7ba24713 | 819 | |
06520ede MC |
820 | if (ep) { |
821 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
822 | return NULL; |
823 | } | |
824 | ||
a79af8a6 MC |
825 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
826 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 827 | if (!shost) |
5bb0b55a | 828 | return NULL; |
38e1a8f5 | 829 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 830 | shost->cmd_per_lun = qdepth; |
75613521 MC |
831 | shost->max_lun = iscsi_max_lun; |
832 | shost->max_id = 0; | |
833 | shost->max_channel = 0; | |
30e9ba9f | 834 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 835 | |
a4804cd6 | 836 | if (iscsi_host_add(shost, NULL)) |
75613521 | 837 | goto free_host; |
75613521 | 838 | |
38e1a8f5 | 839 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 840 | cmds_max, 0, |
38e1a8f5 MC |
841 | sizeof(struct iscsi_tcp_task) + |
842 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 843 | initial_cmdsn, 0); |
75613521 MC |
844 | if (!cls_session) |
845 | goto remove_host; | |
846 | session = cls_session->dd_data; | |
a79af8a6 MC |
847 | tcp_sw_host = iscsi_host_priv(shost); |
848 | tcp_sw_host->session = session; | |
7ba24713 | 849 | |
fbc514b4 | 850 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 851 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 852 | goto remove_session; |
5bb0b55a MC |
853 | return cls_session; |
854 | ||
75613521 | 855 | remove_session: |
5bb0b55a | 856 | iscsi_session_teardown(cls_session); |
75613521 | 857 | remove_host: |
a4804cd6 | 858 | iscsi_host_remove(shost); |
75613521 | 859 | free_host: |
a4804cd6 | 860 | iscsi_host_free(shost); |
5bb0b55a MC |
861 | return NULL; |
862 | } | |
863 | ||
38e1a8f5 | 864 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 865 | { |
75613521 MC |
866 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
867 | ||
38e1a8f5 | 868 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 869 | iscsi_session_teardown(cls_session); |
75613521 | 870 | |
a4804cd6 MC |
871 | iscsi_host_remove(shost); |
872 | iscsi_host_free(shost); | |
7ba24713 AA |
873 | } |
874 | ||
3128c6c7 MC |
875 | static mode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
876 | { | |
877 | switch (param_type) { | |
f27fb2ef MC |
878 | case ISCSI_HOST_PARAM: |
879 | switch (param) { | |
880 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
881 | case ISCSI_HOST_PARAM_HWADDRESS: | |
882 | case ISCSI_HOST_PARAM_IPADDRESS: | |
883 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
884 | return S_IRUGO; | |
885 | default: | |
886 | return 0; | |
887 | } | |
3128c6c7 MC |
888 | case ISCSI_PARAM: |
889 | switch (param) { | |
890 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
891 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
892 | case ISCSI_PARAM_HDRDGST_EN: | |
893 | case ISCSI_PARAM_DATADGST_EN: | |
894 | case ISCSI_PARAM_CONN_ADDRESS: | |
895 | case ISCSI_PARAM_CONN_PORT: | |
896 | case ISCSI_PARAM_EXP_STATSN: | |
897 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
898 | case ISCSI_PARAM_PERSISTENT_PORT: | |
899 | case ISCSI_PARAM_PING_TMO: | |
900 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
901 | case ISCSI_PARAM_INITIAL_R2T_EN: |
902 | case ISCSI_PARAM_MAX_R2T: | |
903 | case ISCSI_PARAM_IMM_DATA_EN: | |
904 | case ISCSI_PARAM_FIRST_BURST: | |
905 | case ISCSI_PARAM_MAX_BURST: | |
906 | case ISCSI_PARAM_PDU_INORDER_EN: | |
907 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
908 | case ISCSI_PARAM_ERL: | |
909 | case ISCSI_PARAM_TARGET_NAME: | |
910 | case ISCSI_PARAM_TPGT: | |
911 | case ISCSI_PARAM_USERNAME: | |
912 | case ISCSI_PARAM_PASSWORD: | |
913 | case ISCSI_PARAM_USERNAME_IN: | |
914 | case ISCSI_PARAM_PASSWORD_IN: | |
915 | case ISCSI_PARAM_FAST_ABORT: | |
916 | case ISCSI_PARAM_ABORT_TMO: | |
917 | case ISCSI_PARAM_LU_RESET_TMO: | |
918 | case ISCSI_PARAM_TGT_RESET_TMO: | |
919 | case ISCSI_PARAM_IFACE_NAME: | |
920 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
921 | return S_IRUGO; |
922 | default: | |
923 | return 0; | |
924 | } | |
925 | } | |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
091e6dbe PW |
930 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
931 | { | |
932 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
933 | return 0; | |
934 | } | |
935 | ||
38e1a8f5 | 936 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 937 | { |
b6d44fe9 | 938 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
939 | blk_queue_dma_alignment(sdev->request_queue, 0); |
940 | return 0; | |
941 | } | |
942 | ||
38e1a8f5 | 943 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 944 | .module = THIS_MODULE, |
f4246b33 | 945 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a MC |
946 | .queuecommand = iscsi_queuecommand, |
947 | .change_queue_depth = iscsi_change_queue_depth, | |
1548271e | 948 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 949 | .sg_tablesize = 4096, |
8231f0ed | 950 | .max_sectors = 0xFFFF, |
5bb0b55a MC |
951 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
952 | .eh_abort_handler = iscsi_eh_abort, | |
843c0a8a | 953 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 954 | .eh_target_reset_handler = iscsi_eh_recover_target, |
5bb0b55a | 955 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 956 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 957 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 958 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
959 | .proc_name = "iscsi_tcp", |
960 | .this_id = -1, | |
961 | }; | |
962 | ||
38e1a8f5 | 963 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
964 | .owner = THIS_MODULE, |
965 | .name = "tcp", | |
966 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
967 | | CAP_DATADGST, | |
5bb0b55a | 968 | /* session management */ |
38e1a8f5 MC |
969 | .create_session = iscsi_sw_tcp_session_create, |
970 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 971 | /* connection management */ |
38e1a8f5 MC |
972 | .create_conn = iscsi_sw_tcp_conn_create, |
973 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
974 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 975 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
976 | .set_param = iscsi_sw_tcp_conn_set_param, |
977 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 978 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 979 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 980 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 981 | /* iscsi host params */ |
a79af8a6 | 982 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 983 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 984 | /* IO */ |
7ba24713 | 985 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 986 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 987 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
988 | .init_task = iscsi_tcp_task_init, |
989 | .xmit_task = iscsi_tcp_task_xmit, | |
990 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 991 | /* low level pdu helpers */ |
38e1a8f5 MC |
992 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
993 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
994 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 995 | /* recovery */ |
30a6c652 | 996 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
997 | }; |
998 | ||
38e1a8f5 | 999 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1000 | { |
7ba24713 | 1001 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1002 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1003 | iscsi_max_lun); | |
7ba24713 AA |
1004 | return -EINVAL; |
1005 | } | |
7ba24713 | 1006 | |
38e1a8f5 MC |
1007 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1008 | &iscsi_sw_tcp_transport); | |
1009 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1010 | return -ENODEV; |
7ba24713 | 1011 | |
7b8631b5 | 1012 | return 0; |
7ba24713 AA |
1013 | } |
1014 | ||
38e1a8f5 | 1015 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1016 | { |
38e1a8f5 | 1017 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1018 | } |
1019 | ||
38e1a8f5 MC |
1020 | module_init(iscsi_sw_tcp_init); |
1021 | module_exit(iscsi_sw_tcp_exit); |