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 | ||
5d6ac29b | 29 | #include <crypto/hash.h> |
7ba24713 | 30 | #include <linux/types.h> |
7ba24713 | 31 | #include <linux/inet.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
f1083048 | 33 | #include <linux/sched/mm.h> |
4e7aba73 | 34 | #include <linux/file.h> |
7ba24713 | 35 | #include <linux/blkdev.h> |
7ba24713 AA |
36 | #include <linux/delay.h> |
37 | #include <linux/kfifo.h> | |
38 | #include <linux/scatterlist.h> | |
acf3368f | 39 | #include <linux/module.h> |
7ba24713 AA |
40 | #include <net/tcp.h> |
41 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 42 | #include <scsi/scsi_device.h> |
7ba24713 AA |
43 | #include <scsi/scsi_host.h> |
44 | #include <scsi/scsi.h> | |
45 | #include <scsi/scsi_transport_iscsi.h> | |
46 | ||
47 | #include "iscsi_tcp.h" | |
48 | ||
38e1a8f5 MC |
49 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
50 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
51 | "Alex Aizman <itn780@yahoo.com>"); |
52 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
53 | MODULE_LICENSE("GPL"); | |
7ba24713 | 54 | |
38e1a8f5 MC |
55 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
56 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
57 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 58 | |
c0e4eaae | 59 | static unsigned int iscsi_max_lun = ~0; |
7ba24713 AA |
60 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
61 | ||
c93f87c7 MC |
62 | static int iscsi_sw_tcp_dbg; |
63 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
64 | S_IRUGO | S_IWUSR); | |
65 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
66 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
67 | ||
68 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
69 | do { \ | |
70 | if (iscsi_sw_tcp_dbg) \ | |
71 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
72 | "%s " dbg_fmt, \ | |
73 | __func__, ##arg); \ | |
74 | } while (0); | |
75 | ||
76 | ||
da32dd68 | 77 | /** |
38e1a8f5 | 78 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
79 | * @rd_desc: read descriptor |
80 | * @skb: socket buffer | |
81 | * @offset: offset in skb | |
82 | * @len: skb->len - offset | |
38e1a8f5 MC |
83 | */ |
84 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
85 | unsigned int offset, size_t len) | |
63c62f1c MC |
86 | { |
87 | struct iscsi_conn *conn = rd_desc->arg.data; | |
88 | unsigned int consumed, total_consumed = 0; | |
89 | int status; | |
90 | ||
c93f87c7 | 91 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
92 | |
93 | do { | |
94 | status = 0; | |
95 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
96 | offset += consumed; | |
97 | total_consumed += consumed; | |
98 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
99 | ||
c93f87c7 MC |
100 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
101 | skb->len - offset, status); | |
63c62f1c | 102 | return total_consumed; |
7ba24713 AA |
103 | } |
104 | ||
523eeac6 HR |
105 | /** |
106 | * iscsi_sw_sk_state_check - check socket state | |
107 | * @sk: socket | |
108 | * | |
109 | * If the socket is in CLOSE or CLOSE_WAIT we should | |
110 | * not close the connection if there is still some | |
111 | * data pending. | |
03adb5f9 MC |
112 | * |
113 | * Must be called with sk_callback_lock. | |
523eeac6 HR |
114 | */ |
115 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
116 | { | |
03adb5f9 | 117 | struct iscsi_conn *conn = sk->sk_user_data; |
523eeac6 | 118 | |
d1af8a32 | 119 | if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
c712495e | 120 | (conn->session->state != ISCSI_STATE_LOGGING_OUT) && |
d1af8a32 MC |
121 | !atomic_read(&sk->sk_rmem_alloc)) { |
122 | ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
123 | iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); | |
124 | return -ECONNRESET; | |
125 | } | |
523eeac6 HR |
126 | return 0; |
127 | } | |
128 | ||
676d2369 | 129 | static void iscsi_sw_tcp_data_ready(struct sock *sk) |
7ba24713 | 130 | { |
03adb5f9 MC |
131 | struct iscsi_conn *conn; |
132 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 AA |
133 | read_descriptor_t rd_desc; |
134 | ||
7cb001d4 | 135 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
136 | conn = sk->sk_user_data; |
137 | if (!conn) { | |
7cb001d4 | 138 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
139 | return; |
140 | } | |
141 | tcp_conn = conn->dd_data; | |
7ba24713 | 142 | |
665b44ae | 143 | /* |
da32dd68 | 144 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 145 | * We set count to 1 because we want the network layer to |
da32dd68 | 146 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
147 | * handled pdus that cross buffers or pdus that still need data. |
148 | */ | |
7ba24713 | 149 | rd_desc.arg.data = conn; |
665b44ae | 150 | rd_desc.count = 1; |
38e1a8f5 | 151 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 152 | |
d1af8a32 | 153 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 154 | |
da32dd68 OK |
155 | /* If we had to (atomically) map a highmem page, |
156 | * unmap it now. */ | |
a8ac6311 | 157 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7cb001d4 | 158 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
159 | } |
160 | ||
38e1a8f5 | 161 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 162 | { |
5bb0b55a | 163 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 164 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 165 | struct iscsi_conn *conn; |
7ba24713 AA |
166 | void (*old_state_change)(struct sock *); |
167 | ||
7cb001d4 | 168 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
169 | conn = sk->sk_user_data; |
170 | if (!conn) { | |
7cb001d4 | 171 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
172 | return; |
173 | } | |
7ba24713 | 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 | 180 | |
7cb001d4 | 181 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
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; | |
28448b80 | 246 | sk->sk_no_check_tx = 0; |
7ba24713 AA |
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; |
f1083048 | 373 | unsigned int noreclaim_flag; |
9e45dd73 MC |
374 | int rc = 0; |
375 | ||
f1083048 | 376 | noreclaim_flag = memalloc_noreclaim_save(); |
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 | |
f1083048 | 389 | memalloc_noreclaim_restore(noreclaim_flag); |
9e45dd73 | 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) { | |
5d6ac29b | 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; |
5d6ac29b | 456 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
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) | |
5d6ac29b | 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; |
5d6ac29b | 482 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
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) | |
5d6ac29b | 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; |
5d6ac29b | 545 | struct crypto_ahash *tfm; |
7ba24713 | 546 | |
38e1a8f5 MC |
547 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
548 | conn_idx); | |
5bb0b55a MC |
549 | if (!cls_conn) |
550 | return NULL; | |
551 | conn = cls_conn->dd_data; | |
5d91e209 | 552 | tcp_conn = conn->dd_data; |
38e1a8f5 | 553 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 554 | |
5d6ac29b HX |
555 | tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
556 | if (IS_ERR(tfm)) | |
5d91e209 | 557 | goto free_conn; |
dd8c0d95 | 558 | |
5d6ac29b HX |
559 | tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
560 | if (!tcp_sw_conn->tx_hash) | |
561 | goto free_tfm; | |
562 | ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL); | |
563 | ||
564 | tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); | |
565 | if (!tcp_sw_conn->rx_hash) | |
566 | goto free_tx_hash; | |
567 | ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL); | |
568 | ||
569 | tcp_conn->rx_hash = tcp_sw_conn->rx_hash; | |
dd8c0d95 | 570 | |
5bb0b55a | 571 | return cls_conn; |
7ba24713 | 572 | |
5d6ac29b HX |
573 | free_tx_hash: |
574 | ahash_request_free(tcp_sw_conn->tx_hash); | |
575 | free_tfm: | |
576 | crypto_free_ahash(tfm); | |
5d91e209 | 577 | free_conn: |
322d739d MC |
578 | iscsi_conn_printk(KERN_ERR, conn, |
579 | "Could not create connection due to crc32c " | |
580 | "loading error. Make sure the crc32c " | |
581 | "module is built as a module or into the " | |
582 | "kernel\n"); | |
38e1a8f5 | 583 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 584 | return NULL; |
7ba24713 AA |
585 | } |
586 | ||
38e1a8f5 | 587 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 588 | { |
22236961 | 589 | struct iscsi_session *session = conn->session; |
1c83469d | 590 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
591 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
592 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 593 | |
22236961 | 594 | if (!sock) |
1c83469d MC |
595 | return; |
596 | ||
22236961 | 597 | sock_hold(sock->sk); |
c484a50a | 598 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 599 | sock_put(sock->sk); |
1c83469d | 600 | |
659743b0 | 601 | spin_lock_bh(&session->frwd_lock); |
38e1a8f5 | 602 | tcp_sw_conn->sock = NULL; |
659743b0 | 603 | spin_unlock_bh(&session->frwd_lock); |
22236961 | 604 | sockfd_put(sock); |
1c83469d MC |
605 | } |
606 | ||
38e1a8f5 | 607 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 608 | { |
5bb0b55a MC |
609 | struct iscsi_conn *conn = cls_conn->dd_data; |
610 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 611 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 612 | |
38e1a8f5 | 613 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 614 | |
5d6ac29b HX |
615 | ahash_request_free(tcp_sw_conn->rx_hash); |
616 | if (tcp_sw_conn->tx_hash) { | |
617 | struct crypto_ahash *tfm; | |
618 | ||
619 | tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash); | |
620 | ahash_request_free(tcp_sw_conn->tx_hash); | |
621 | crypto_free_ahash(tfm); | |
622 | } | |
7ba24713 | 623 | |
38e1a8f5 | 624 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 625 | } |
7ba24713 | 626 | |
38e1a8f5 | 627 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
628 | { |
629 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 630 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 631 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 632 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
633 | |
634 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 635 | if (!sock) |
913e5bf4 | 636 | return; |
1c83469d | 637 | |
8c38a295 MC |
638 | sock->sk->sk_err = EIO; |
639 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 640 | |
03adb5f9 MC |
641 | /* stop xmit side */ |
642 | iscsi_suspend_tx(conn); | |
643 | ||
644 | /* stop recv side and release socket */ | |
38e1a8f5 | 645 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
646 | |
647 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
648 | } |
649 | ||
5bb0b55a | 650 | static int |
38e1a8f5 MC |
651 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
652 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
653 | int is_leading) | |
5bb0b55a | 654 | { |
a79af8a6 | 655 | struct iscsi_session *session = cls_session->dd_data; |
5bb0b55a MC |
656 | struct iscsi_conn *conn = cls_conn->dd_data; |
657 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 658 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
659 | struct sock *sk; |
660 | struct socket *sock; | |
661 | int err; | |
7ba24713 | 662 | |
5bb0b55a | 663 | /* lookup for existing socket */ |
264faaaa | 664 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 665 | if (!sock) { |
322d739d MC |
666 | iscsi_conn_printk(KERN_ERR, conn, |
667 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 668 | return -EEXIST; |
7ba24713 AA |
669 | } |
670 | ||
5bb0b55a MC |
671 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
672 | if (err) | |
22236961 | 673 | goto free_socket; |
7ba24713 | 674 | |
659743b0 | 675 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 676 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 677 | tcp_sw_conn->sock = sock; |
659743b0 | 678 | spin_unlock_bh(&session->frwd_lock); |
7ba24713 | 679 | |
67a61114 MC |
680 | /* setup Socket parameters */ |
681 | sk = sock->sk; | |
4a17fd52 | 682 | sk->sk_reuse = SK_CAN_REUSE; |
67a61114 MC |
683 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
684 | sk->sk_allocation = GFP_ATOMIC; | |
9e45dd73 | 685 | sk_set_memalloc(sk); |
7ba24713 | 686 | |
38e1a8f5 MC |
687 | iscsi_sw_tcp_conn_set_callbacks(conn); |
688 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
689 | /* |
690 | * set receive state machine into initial state | |
691 | */ | |
da32dd68 | 692 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 693 | return 0; |
22236961 MC |
694 | |
695 | free_socket: | |
696 | sockfd_put(sock); | |
697 | return err; | |
7ba24713 AA |
698 | } |
699 | ||
38e1a8f5 MC |
700 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
701 | enum iscsi_param param, char *buf, | |
702 | int buflen) | |
7ba24713 | 703 | { |
7b7232f3 | 704 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 705 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 706 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 707 | |
7ba24713 | 708 | switch(param) { |
7ba24713 | 709 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 710 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
711 | break; |
712 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 713 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
714 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
715 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 716 | break; |
7ba24713 | 717 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 718 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 719 | default: |
5c75b7fc | 720 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
721 | } |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
38e1a8f5 MC |
726 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
727 | enum iscsi_param param, char *buf) | |
7b8631b5 | 728 | { |
7b7232f3 | 729 | struct iscsi_conn *conn = cls_conn->dd_data; |
a79af8a6 MC |
730 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
731 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
732 | struct sockaddr_in6 addr; | |
733 | int rc, len; | |
7b8631b5 MC |
734 | |
735 | switch(param) { | |
fd7255f5 | 736 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 737 | case ISCSI_PARAM_CONN_ADDRESS: |
4bfb8ebf | 738 | case ISCSI_PARAM_LOCAL_PORT: |
659743b0 | 739 | spin_lock_bh(&conn->session->frwd_lock); |
a79af8a6 | 740 | if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
659743b0 | 741 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
742 | return -ENOTCONN; |
743 | } | |
4bfb8ebf MC |
744 | if (param == ISCSI_PARAM_LOCAL_PORT) |
745 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
746 | (struct sockaddr *)&addr, &len); | |
747 | else | |
748 | rc = kernel_getpeername(tcp_sw_conn->sock, | |
749 | (struct sockaddr *)&addr, &len); | |
659743b0 | 750 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
751 | if (rc) |
752 | return rc; | |
753 | ||
754 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
755 | &addr, param, buf); | |
fd7255f5 | 756 | default: |
5c75b7fc | 757 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
758 | } |
759 | ||
a79af8a6 MC |
760 | return 0; |
761 | } | |
762 | ||
763 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
764 | enum iscsi_host_param param, char *buf) | |
765 | { | |
766 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
767 | struct iscsi_session *session = tcp_sw_host->session; | |
768 | struct iscsi_conn *conn; | |
769 | struct iscsi_tcp_conn *tcp_conn; | |
770 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
771 | struct sockaddr_in6 addr; | |
772 | int rc, len; | |
773 | ||
774 | switch (param) { | |
775 | case ISCSI_HOST_PARAM_IPADDRESS: | |
eee2b5c8 MC |
776 | if (!session) |
777 | return -ENOTCONN; | |
778 | ||
659743b0 | 779 | spin_lock_bh(&session->frwd_lock); |
a79af8a6 MC |
780 | conn = session->leadconn; |
781 | if (!conn) { | |
659743b0 | 782 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
783 | return -ENOTCONN; |
784 | } | |
785 | tcp_conn = conn->dd_data; | |
786 | ||
787 | tcp_sw_conn = tcp_conn->dd_data; | |
788 | if (!tcp_sw_conn->sock) { | |
659743b0 | 789 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
790 | return -ENOTCONN; |
791 | } | |
792 | ||
793 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
794 | (struct sockaddr *)&addr, &len); | |
659743b0 | 795 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
796 | if (rc) |
797 | return rc; | |
798 | ||
799 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
800 | &addr, param, buf); | |
801 | default: | |
802 | return iscsi_host_get_param(shost, param, buf); | |
803 | } | |
804 | ||
805 | return 0; | |
fd7255f5 MC |
806 | } |
807 | ||
7ba24713 | 808 | static void |
38e1a8f5 MC |
809 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
810 | struct iscsi_stats *stats) | |
7ba24713 | 811 | { |
7b7232f3 | 812 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 813 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 814 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 815 | |
7ba24713 AA |
816 | stats->custom_length = 3; |
817 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 818 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 819 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 820 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
821 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
822 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
823 | |
824 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
825 | } |
826 | ||
5bb0b55a | 827 | static struct iscsi_cls_session * |
38e1a8f5 | 828 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 829 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 830 | { |
5bb0b55a MC |
831 | struct iscsi_cls_session *cls_session; |
832 | struct iscsi_session *session; | |
a79af8a6 | 833 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 834 | struct Scsi_Host *shost; |
7ba24713 | 835 | |
06520ede MC |
836 | if (ep) { |
837 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
838 | return NULL; |
839 | } | |
840 | ||
a79af8a6 MC |
841 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
842 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 843 | if (!shost) |
5bb0b55a | 844 | return NULL; |
38e1a8f5 | 845 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 846 | shost->cmd_per_lun = qdepth; |
75613521 MC |
847 | shost->max_lun = iscsi_max_lun; |
848 | shost->max_id = 0; | |
849 | shost->max_channel = 0; | |
30e9ba9f | 850 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 851 | |
a4804cd6 | 852 | if (iscsi_host_add(shost, NULL)) |
75613521 | 853 | goto free_host; |
75613521 | 854 | |
38e1a8f5 | 855 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 856 | cmds_max, 0, |
38e1a8f5 MC |
857 | sizeof(struct iscsi_tcp_task) + |
858 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 859 | initial_cmdsn, 0); |
75613521 MC |
860 | if (!cls_session) |
861 | goto remove_host; | |
862 | session = cls_session->dd_data; | |
a79af8a6 MC |
863 | tcp_sw_host = iscsi_host_priv(shost); |
864 | tcp_sw_host->session = session; | |
7ba24713 | 865 | |
fbc514b4 | 866 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 867 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 868 | goto remove_session; |
5bb0b55a MC |
869 | return cls_session; |
870 | ||
75613521 | 871 | remove_session: |
5bb0b55a | 872 | iscsi_session_teardown(cls_session); |
75613521 | 873 | remove_host: |
a4804cd6 | 874 | iscsi_host_remove(shost); |
75613521 | 875 | free_host: |
a4804cd6 | 876 | iscsi_host_free(shost); |
5bb0b55a MC |
877 | return NULL; |
878 | } | |
879 | ||
38e1a8f5 | 880 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 881 | { |
75613521 MC |
882 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
883 | ||
38e1a8f5 | 884 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 885 | iscsi_session_teardown(cls_session); |
75613521 | 886 | |
a4804cd6 MC |
887 | iscsi_host_remove(shost); |
888 | iscsi_host_free(shost); | |
7ba24713 AA |
889 | } |
890 | ||
587a1f16 | 891 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
892 | { |
893 | switch (param_type) { | |
f27fb2ef MC |
894 | case ISCSI_HOST_PARAM: |
895 | switch (param) { | |
896 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
897 | case ISCSI_HOST_PARAM_HWADDRESS: | |
898 | case ISCSI_HOST_PARAM_IPADDRESS: | |
899 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
900 | return S_IRUGO; | |
901 | default: | |
902 | return 0; | |
903 | } | |
3128c6c7 MC |
904 | case ISCSI_PARAM: |
905 | switch (param) { | |
906 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
907 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
908 | case ISCSI_PARAM_HDRDGST_EN: | |
909 | case ISCSI_PARAM_DATADGST_EN: | |
910 | case ISCSI_PARAM_CONN_ADDRESS: | |
911 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 912 | case ISCSI_PARAM_LOCAL_PORT: |
3128c6c7 MC |
913 | case ISCSI_PARAM_EXP_STATSN: |
914 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
915 | case ISCSI_PARAM_PERSISTENT_PORT: | |
916 | case ISCSI_PARAM_PING_TMO: | |
917 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
918 | case ISCSI_PARAM_INITIAL_R2T_EN: |
919 | case ISCSI_PARAM_MAX_R2T: | |
920 | case ISCSI_PARAM_IMM_DATA_EN: | |
921 | case ISCSI_PARAM_FIRST_BURST: | |
922 | case ISCSI_PARAM_MAX_BURST: | |
923 | case ISCSI_PARAM_PDU_INORDER_EN: | |
924 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
925 | case ISCSI_PARAM_ERL: | |
926 | case ISCSI_PARAM_TARGET_NAME: | |
927 | case ISCSI_PARAM_TPGT: | |
928 | case ISCSI_PARAM_USERNAME: | |
929 | case ISCSI_PARAM_PASSWORD: | |
930 | case ISCSI_PARAM_USERNAME_IN: | |
931 | case ISCSI_PARAM_PASSWORD_IN: | |
932 | case ISCSI_PARAM_FAST_ABORT: | |
933 | case ISCSI_PARAM_ABORT_TMO: | |
934 | case ISCSI_PARAM_LU_RESET_TMO: | |
935 | case ISCSI_PARAM_TGT_RESET_TMO: | |
936 | case ISCSI_PARAM_IFACE_NAME: | |
937 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
938 | return S_IRUGO; |
939 | default: | |
940 | return 0; | |
941 | } | |
942 | } | |
943 | ||
944 | return 0; | |
945 | } | |
946 | ||
091e6dbe PW |
947 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
948 | { | |
949 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
950 | return 0; | |
951 | } | |
952 | ||
38e1a8f5 | 953 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 954 | { |
b6d44fe9 | 955 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
956 | blk_queue_dma_alignment(sdev->request_queue, 0); |
957 | return 0; | |
958 | } | |
959 | ||
38e1a8f5 | 960 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 961 | .module = THIS_MODULE, |
f4246b33 | 962 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a | 963 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 964 | .change_queue_depth = scsi_change_queue_depth, |
1548271e | 965 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 966 | .sg_tablesize = 4096, |
8231f0ed | 967 | .max_sectors = 0xFFFF, |
5bb0b55a | 968 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
b6a05c82 | 969 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
5bb0b55a | 970 | .eh_abort_handler = iscsi_eh_abort, |
843c0a8a | 971 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 972 | .eh_target_reset_handler = iscsi_eh_recover_target, |
5bb0b55a | 973 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 974 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 975 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 976 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
977 | .proc_name = "iscsi_tcp", |
978 | .this_id = -1, | |
c40ecc12 | 979 | .track_queue_depth = 1, |
5bb0b55a MC |
980 | }; |
981 | ||
38e1a8f5 | 982 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
983 | .owner = THIS_MODULE, |
984 | .name = "tcp", | |
985 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
986 | | CAP_DATADGST, | |
5bb0b55a | 987 | /* session management */ |
38e1a8f5 MC |
988 | .create_session = iscsi_sw_tcp_session_create, |
989 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 990 | /* connection management */ |
38e1a8f5 MC |
991 | .create_conn = iscsi_sw_tcp_conn_create, |
992 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
993 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 994 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
995 | .set_param = iscsi_sw_tcp_conn_set_param, |
996 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 997 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 998 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 999 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 1000 | /* iscsi host params */ |
a79af8a6 | 1001 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 1002 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1003 | /* IO */ |
7ba24713 | 1004 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 1005 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 1006 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1007 | .init_task = iscsi_tcp_task_init, |
1008 | .xmit_task = iscsi_tcp_task_xmit, | |
1009 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 1010 | /* low level pdu helpers */ |
38e1a8f5 MC |
1011 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
1012 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
1013 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 1014 | /* recovery */ |
30a6c652 | 1015 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1016 | }; |
1017 | ||
38e1a8f5 | 1018 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1019 | { |
7ba24713 | 1020 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1021 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1022 | iscsi_max_lun); | |
7ba24713 AA |
1023 | return -EINVAL; |
1024 | } | |
7ba24713 | 1025 | |
38e1a8f5 MC |
1026 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1027 | &iscsi_sw_tcp_transport); | |
1028 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1029 | return -ENODEV; |
7ba24713 | 1030 | |
7b8631b5 | 1031 | return 0; |
7ba24713 AA |
1032 | } |
1033 | ||
38e1a8f5 | 1034 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1035 | { |
38e1a8f5 | 1036 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1037 | } |
1038 | ||
38e1a8f5 MC |
1039 | module_init(iscsi_sw_tcp_init); |
1040 | module_exit(iscsi_sw_tcp_exit); |