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 AA |
165 | struct iscsi_conn *conn; |
166 | struct iscsi_session *session; | |
167 | void (*old_state_change)(struct sock *); | |
168 | ||
7cb001d4 | 169 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
170 | conn = sk->sk_user_data; |
171 | if (!conn) { | |
7cb001d4 | 172 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
173 | return; |
174 | } | |
7ba24713 AA |
175 | session = conn->session; |
176 | ||
d1af8a32 | 177 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 178 | |
5bb0b55a | 179 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
180 | tcp_sw_conn = tcp_conn->dd_data; |
181 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 | 182 | |
7cb001d4 | 183 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
184 | |
185 | old_state_change(sk); | |
186 | } | |
187 | ||
188 | /** | |
189 | * iscsi_write_space - Called when more output buffer space is available | |
190 | * @sk: socket space is available for | |
191 | **/ | |
38e1a8f5 | 192 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 193 | { |
03adb5f9 MC |
194 | struct iscsi_conn *conn; |
195 | struct iscsi_tcp_conn *tcp_conn; | |
196 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
197 | void (*old_write_space)(struct sock *); | |
198 | ||
199 | read_lock_bh(&sk->sk_callback_lock); | |
200 | conn = sk->sk_user_data; | |
201 | if (!conn) { | |
202 | read_unlock_bh(&sk->sk_callback_lock); | |
203 | return; | |
204 | } | |
205 | ||
206 | tcp_conn = conn->dd_data; | |
207 | tcp_sw_conn = tcp_conn->dd_data; | |
208 | old_write_space = tcp_sw_conn->old_write_space; | |
209 | read_unlock_bh(&sk->sk_callback_lock); | |
210 | ||
211 | old_write_space(sk); | |
5bb0b55a | 212 | |
c93f87c7 | 213 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 214 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
215 | } |
216 | ||
38e1a8f5 | 217 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 218 | { |
5bb0b55a | 219 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
220 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
221 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
222 | |
223 | /* assign new callbacks */ | |
224 | write_lock_bh(&sk->sk_callback_lock); | |
225 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
226 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
227 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
228 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
229 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
230 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
231 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
232 | write_unlock_bh(&sk->sk_callback_lock); |
233 | } | |
234 | ||
38e1a8f5 | 235 | static void |
c484a50a | 236 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 237 | { |
c484a50a AK |
238 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
239 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 240 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
241 | |
242 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
243 | write_lock_bh(&sk->sk_callback_lock); | |
244 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
245 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
246 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
247 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
28448b80 | 248 | sk->sk_no_check_tx = 0; |
7ba24713 AA |
249 | write_unlock_bh(&sk->sk_callback_lock); |
250 | } | |
251 | ||
252 | /** | |
38e1a8f5 | 253 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 254 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
255 | * @segment: the buffer to transmnit |
256 | * | |
257 | * This function transmits as much of the buffer as | |
258 | * the network layer will accept, and returns the number of | |
259 | * bytes transmitted. | |
260 | * | |
261 | * If CRC hashing is enabled, the function will compute the | |
262 | * hash as it goes. When the entire segment has been transmitted, | |
263 | * it will retrieve the hash value and send it as well. | |
264 | */ | |
6df19a79 | 265 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
266 | struct iscsi_segment *segment) |
267 | { | |
6df19a79 | 268 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
269 | struct socket *sk = tcp_sw_conn->sock; |
270 | unsigned int copied = 0; | |
271 | int r = 0; | |
272 | ||
6df19a79 | 273 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
274 | struct scatterlist *sg; |
275 | unsigned int offset, copy; | |
276 | int flags = 0; | |
277 | ||
278 | r = 0; | |
279 | offset = segment->copied; | |
280 | copy = segment->size - offset; | |
281 | ||
282 | if (segment->total_copied + segment->size < segment->total_size) | |
283 | flags |= MSG_MORE; | |
284 | ||
285 | /* Use sendpage if we can; else fall back to sendmsg */ | |
286 | if (!segment->data) { | |
287 | sg = segment->sg; | |
288 | offset += segment->sg_offset + sg->offset; | |
289 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
290 | copy, flags); | |
291 | } else { | |
292 | struct msghdr msg = { .msg_flags = flags }; | |
293 | struct kvec iov = { | |
294 | .iov_base = segment->data + offset, | |
295 | .iov_len = copy | |
296 | }; | |
297 | ||
298 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
299 | } | |
300 | ||
301 | if (r < 0) { | |
302 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
303 | return r; |
304 | } | |
305 | copied += r; | |
306 | } | |
307 | return copied; | |
308 | } | |
309 | ||
310 | /** | |
311 | * iscsi_sw_tcp_xmit - TCP transmit | |
a8ac6311 | 312 | **/ |
38e1a8f5 | 313 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 314 | { |
5bb0b55a | 315 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
316 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
317 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
318 | unsigned int consumed = 0; |
319 | int rc = 0; | |
7ba24713 | 320 | |
a8ac6311 | 321 | while (1) { |
6df19a79 | 322 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
323 | /* |
324 | * We may not have been able to send data because the conn | |
25985edc | 325 | * is getting stopped. libiscsi will know so propagate err |
32382492 MC |
326 | * for it to do the right thing. |
327 | */ | |
328 | if (rc == -EAGAIN) | |
329 | return rc; | |
330 | else if (rc < 0) { | |
6f481e3c | 331 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 332 | goto error; |
32382492 | 333 | } else if (rc == 0) |
a8ac6311 OK |
334 | break; |
335 | ||
336 | consumed += rc; | |
337 | ||
338 | if (segment->total_copied >= segment->total_size) { | |
339 | if (segment->done != NULL) { | |
340 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 341 | if (rc != 0) |
a8ac6311 OK |
342 | goto error; |
343 | } | |
344 | } | |
3219e529 MC |
345 | } |
346 | ||
c93f87c7 | 347 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
348 | |
349 | conn->txdata_octets += consumed; | |
350 | return consumed; | |
351 | ||
352 | error: | |
353 | /* Transmit error. We could initiate error recovery | |
354 | * here. */ | |
c93f87c7 | 355 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
356 | iscsi_conn_failure(conn, rc); |
357 | return -EIO; | |
7ba24713 AA |
358 | } |
359 | ||
360 | /** | |
a8ac6311 OK |
361 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
362 | */ | |
38e1a8f5 | 363 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 364 | { |
a8ac6311 | 365 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
366 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
367 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 368 | |
a8ac6311 | 369 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
370 | } |
371 | ||
38e1a8f5 | 372 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 373 | { |
e5a7efef | 374 | struct iscsi_conn *conn = task->conn; |
f1083048 | 375 | unsigned int noreclaim_flag; |
9e45dd73 MC |
376 | int rc = 0; |
377 | ||
f1083048 | 378 | noreclaim_flag = memalloc_noreclaim_save(); |
a8ac6311 | 379 | |
38e1a8f5 MC |
380 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
381 | rc = iscsi_sw_tcp_xmit(conn); | |
9e45dd73 MC |
382 | if (rc == 0) { |
383 | rc = -EAGAIN; | |
384 | break; | |
385 | } | |
a8ac6311 | 386 | if (rc < 0) |
9e45dd73 MC |
387 | break; |
388 | rc = 0; | |
3219e529 | 389 | } |
7ba24713 | 390 | |
f1083048 | 391 | memalloc_noreclaim_restore(noreclaim_flag); |
9e45dd73 | 392 | return rc; |
7ba24713 AA |
393 | } |
394 | ||
a8ac6311 OK |
395 | /* |
396 | * This is called when we're done sending the header. | |
397 | * Simply copy the data_segment to the send segment, and return. | |
398 | */ | |
38e1a8f5 MC |
399 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
400 | struct iscsi_segment *segment) | |
7ba24713 | 401 | { |
38e1a8f5 MC |
402 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
403 | ||
404 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
405 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
406 | "Header done. Next segment size %u total_size %u\n", | |
407 | tcp_sw_conn->out.segment.size, | |
408 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
409 | return 0; |
410 | } | |
411 | ||
38e1a8f5 MC |
412 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
413 | size_t hdrlen) | |
a8ac6311 OK |
414 | { |
415 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 416 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 417 | |
c93f87c7 MC |
418 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
419 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
420 | |
421 | /* Clear the data segment - needs to be filled in by the | |
422 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
423 | memset(&tcp_sw_conn->out.data_segment, 0, |
424 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
425 | |
426 | /* If header digest is enabled, compute the CRC and | |
427 | * place the digest into the same buffer. We make | |
135a8ad4 | 428 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
429 | * sufficient room. |
430 | */ | |
431 | if (conn->hdrdgst_en) { | |
5d6ac29b | 432 | iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
433 | hdr + hdrlen); |
434 | hdrlen += ISCSI_DIGEST_SIZE; | |
435 | } | |
436 | ||
437 | /* Remember header pointer for later, when we need | |
438 | * to decide whether there's a payload to go along | |
439 | * with the header. */ | |
38e1a8f5 | 440 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 441 | |
38e1a8f5 MC |
442 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
443 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
444 | } |
445 | ||
446 | /* | |
447 | * Prepare the send buffer for the payload data. | |
448 | * Padding and checksumming will all be taken care | |
449 | * of by the iscsi_segment routines. | |
450 | */ | |
451 | static int | |
38e1a8f5 MC |
452 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
453 | unsigned int count, unsigned int offset, | |
454 | unsigned int len) | |
a8ac6311 OK |
455 | { |
456 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 457 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 458 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
459 | unsigned int hdr_spec_len; |
460 | ||
c93f87c7 MC |
461 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
462 | conn->datadgst_en ? | |
463 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
464 | |
465 | /* Make sure the datalen matches what the caller | |
466 | said he would send. */ | |
38e1a8f5 | 467 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
468 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
469 | ||
470 | if (conn->datadgst_en) | |
5d6ac29b | 471 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 472 | |
38e1a8f5 MC |
473 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
474 | sg, count, offset, len, | |
475 | NULL, tx_hash); | |
a8ac6311 OK |
476 | } |
477 | ||
478 | static void | |
38e1a8f5 | 479 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
480 | size_t len) |
481 | { | |
482 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 483 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 484 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
485 | unsigned int hdr_spec_len; |
486 | ||
c93f87c7 MC |
487 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
488 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
489 | |
490 | /* Make sure the datalen matches what the caller | |
491 | said he would send. */ | |
38e1a8f5 | 492 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
493 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
494 | ||
495 | if (conn->datadgst_en) | |
5d6ac29b | 496 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 497 | |
38e1a8f5 | 498 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 499 | data, len, NULL, tx_hash); |
7ba24713 AA |
500 | } |
501 | ||
38e1a8f5 MC |
502 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
503 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
504 | { |
505 | struct iscsi_conn *conn = task->conn; | |
506 | int err = 0; | |
507 | ||
38e1a8f5 | 508 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
509 | |
510 | if (!count) | |
511 | return 0; | |
512 | ||
513 | if (!task->sc) | |
38e1a8f5 | 514 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
515 | else { |
516 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
517 | ||
38e1a8f5 MC |
518 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
519 | sdb->table.nents, offset, | |
520 | count); | |
e5a7efef MC |
521 | } |
522 | ||
523 | if (err) { | |
9a6510eb | 524 | /* got invalid offset/len */ |
e5a7efef MC |
525 | return -EIO; |
526 | } | |
527 | return 0; | |
528 | } | |
529 | ||
2ff79d52 | 530 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 531 | { |
135a8ad4 | 532 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 533 | |
38e1a8f5 MC |
534 | task->hdr = task->dd_data + sizeof(*tcp_task); |
535 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 536 | return 0; |
7ba24713 AA |
537 | } |
538 | ||
5bb0b55a | 539 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
540 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
541 | uint32_t conn_idx) | |
7ba24713 | 542 | { |
5bb0b55a MC |
543 | struct iscsi_conn *conn; |
544 | struct iscsi_cls_conn *cls_conn; | |
545 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 546 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
5d6ac29b | 547 | struct crypto_ahash *tfm; |
7ba24713 | 548 | |
38e1a8f5 MC |
549 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
550 | conn_idx); | |
5bb0b55a MC |
551 | if (!cls_conn) |
552 | return NULL; | |
553 | conn = cls_conn->dd_data; | |
5d91e209 | 554 | tcp_conn = conn->dd_data; |
38e1a8f5 | 555 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 556 | |
5d6ac29b HX |
557 | tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
558 | if (IS_ERR(tfm)) | |
5d91e209 | 559 | goto free_conn; |
dd8c0d95 | 560 | |
5d6ac29b HX |
561 | tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
562 | if (!tcp_sw_conn->tx_hash) | |
563 | goto free_tfm; | |
564 | ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL); | |
565 | ||
566 | tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); | |
567 | if (!tcp_sw_conn->rx_hash) | |
568 | goto free_tx_hash; | |
569 | ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL); | |
570 | ||
571 | tcp_conn->rx_hash = tcp_sw_conn->rx_hash; | |
dd8c0d95 | 572 | |
5bb0b55a | 573 | return cls_conn; |
7ba24713 | 574 | |
5d6ac29b HX |
575 | free_tx_hash: |
576 | ahash_request_free(tcp_sw_conn->tx_hash); | |
577 | free_tfm: | |
578 | crypto_free_ahash(tfm); | |
5d91e209 | 579 | free_conn: |
322d739d MC |
580 | iscsi_conn_printk(KERN_ERR, conn, |
581 | "Could not create connection due to crc32c " | |
582 | "loading error. Make sure the crc32c " | |
583 | "module is built as a module or into the " | |
584 | "kernel\n"); | |
38e1a8f5 | 585 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 586 | return NULL; |
7ba24713 AA |
587 | } |
588 | ||
38e1a8f5 | 589 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 590 | { |
22236961 | 591 | struct iscsi_session *session = conn->session; |
1c83469d | 592 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
593 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
594 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 595 | |
22236961 | 596 | if (!sock) |
1c83469d MC |
597 | return; |
598 | ||
22236961 | 599 | sock_hold(sock->sk); |
c484a50a | 600 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 601 | sock_put(sock->sk); |
1c83469d | 602 | |
659743b0 | 603 | spin_lock_bh(&session->frwd_lock); |
38e1a8f5 | 604 | tcp_sw_conn->sock = NULL; |
659743b0 | 605 | spin_unlock_bh(&session->frwd_lock); |
22236961 | 606 | sockfd_put(sock); |
1c83469d MC |
607 | } |
608 | ||
38e1a8f5 | 609 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 610 | { |
5bb0b55a MC |
611 | struct iscsi_conn *conn = cls_conn->dd_data; |
612 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 613 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 614 | |
38e1a8f5 | 615 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 616 | |
5d6ac29b HX |
617 | ahash_request_free(tcp_sw_conn->rx_hash); |
618 | if (tcp_sw_conn->tx_hash) { | |
619 | struct crypto_ahash *tfm; | |
620 | ||
621 | tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash); | |
622 | ahash_request_free(tcp_sw_conn->tx_hash); | |
623 | crypto_free_ahash(tfm); | |
624 | } | |
7ba24713 | 625 | |
38e1a8f5 | 626 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 627 | } |
7ba24713 | 628 | |
38e1a8f5 | 629 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
630 | { |
631 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 632 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 633 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 634 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
635 | |
636 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 637 | if (!sock) |
913e5bf4 | 638 | return; |
1c83469d | 639 | |
8c38a295 MC |
640 | sock->sk->sk_err = EIO; |
641 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 642 | |
03adb5f9 MC |
643 | /* stop xmit side */ |
644 | iscsi_suspend_tx(conn); | |
645 | ||
646 | /* stop recv side and release socket */ | |
38e1a8f5 | 647 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
648 | |
649 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
650 | } |
651 | ||
5bb0b55a | 652 | static int |
38e1a8f5 MC |
653 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
654 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
655 | int is_leading) | |
5bb0b55a | 656 | { |
a79af8a6 | 657 | struct iscsi_session *session = cls_session->dd_data; |
5bb0b55a MC |
658 | struct iscsi_conn *conn = cls_conn->dd_data; |
659 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 660 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
661 | struct sock *sk; |
662 | struct socket *sock; | |
663 | int err; | |
7ba24713 | 664 | |
5bb0b55a | 665 | /* lookup for existing socket */ |
264faaaa | 666 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 667 | if (!sock) { |
322d739d MC |
668 | iscsi_conn_printk(KERN_ERR, conn, |
669 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 670 | return -EEXIST; |
7ba24713 AA |
671 | } |
672 | ||
5bb0b55a MC |
673 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
674 | if (err) | |
22236961 | 675 | goto free_socket; |
7ba24713 | 676 | |
659743b0 | 677 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 678 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 679 | tcp_sw_conn->sock = sock; |
659743b0 | 680 | spin_unlock_bh(&session->frwd_lock); |
7ba24713 | 681 | |
67a61114 MC |
682 | /* setup Socket parameters */ |
683 | sk = sock->sk; | |
4a17fd52 | 684 | sk->sk_reuse = SK_CAN_REUSE; |
67a61114 MC |
685 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
686 | sk->sk_allocation = GFP_ATOMIC; | |
9e45dd73 | 687 | sk_set_memalloc(sk); |
7ba24713 | 688 | |
38e1a8f5 MC |
689 | iscsi_sw_tcp_conn_set_callbacks(conn); |
690 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
691 | /* |
692 | * set receive state machine into initial state | |
693 | */ | |
da32dd68 | 694 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 695 | return 0; |
22236961 MC |
696 | |
697 | free_socket: | |
698 | sockfd_put(sock); | |
699 | return err; | |
7ba24713 AA |
700 | } |
701 | ||
38e1a8f5 MC |
702 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
703 | enum iscsi_param param, char *buf, | |
704 | int buflen) | |
7ba24713 | 705 | { |
7b7232f3 | 706 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 707 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 708 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 709 | |
7ba24713 | 710 | switch(param) { |
7ba24713 | 711 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 712 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
713 | break; |
714 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 715 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
716 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
717 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 718 | break; |
7ba24713 | 719 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 720 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 721 | default: |
5c75b7fc | 722 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
723 | } |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
38e1a8f5 MC |
728 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
729 | enum iscsi_param param, char *buf) | |
7b8631b5 | 730 | { |
7b7232f3 | 731 | struct iscsi_conn *conn = cls_conn->dd_data; |
a79af8a6 MC |
732 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
733 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
734 | struct sockaddr_in6 addr; | |
735 | int rc, len; | |
7b8631b5 MC |
736 | |
737 | switch(param) { | |
fd7255f5 | 738 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 739 | case ISCSI_PARAM_CONN_ADDRESS: |
4bfb8ebf | 740 | case ISCSI_PARAM_LOCAL_PORT: |
659743b0 | 741 | spin_lock_bh(&conn->session->frwd_lock); |
a79af8a6 | 742 | if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
659743b0 | 743 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
744 | return -ENOTCONN; |
745 | } | |
4bfb8ebf MC |
746 | if (param == ISCSI_PARAM_LOCAL_PORT) |
747 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
748 | (struct sockaddr *)&addr, &len); | |
749 | else | |
750 | rc = kernel_getpeername(tcp_sw_conn->sock, | |
751 | (struct sockaddr *)&addr, &len); | |
659743b0 | 752 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
753 | if (rc) |
754 | return rc; | |
755 | ||
756 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
757 | &addr, param, buf); | |
fd7255f5 | 758 | default: |
5c75b7fc | 759 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
760 | } |
761 | ||
a79af8a6 MC |
762 | return 0; |
763 | } | |
764 | ||
765 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
766 | enum iscsi_host_param param, char *buf) | |
767 | { | |
768 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
769 | struct iscsi_session *session = tcp_sw_host->session; | |
770 | struct iscsi_conn *conn; | |
771 | struct iscsi_tcp_conn *tcp_conn; | |
772 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
773 | struct sockaddr_in6 addr; | |
774 | int rc, len; | |
775 | ||
776 | switch (param) { | |
777 | case ISCSI_HOST_PARAM_IPADDRESS: | |
eee2b5c8 MC |
778 | if (!session) |
779 | return -ENOTCONN; | |
780 | ||
659743b0 | 781 | spin_lock_bh(&session->frwd_lock); |
a79af8a6 MC |
782 | conn = session->leadconn; |
783 | if (!conn) { | |
659743b0 | 784 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
785 | return -ENOTCONN; |
786 | } | |
787 | tcp_conn = conn->dd_data; | |
788 | ||
789 | tcp_sw_conn = tcp_conn->dd_data; | |
790 | if (!tcp_sw_conn->sock) { | |
659743b0 | 791 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
792 | return -ENOTCONN; |
793 | } | |
794 | ||
795 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
796 | (struct sockaddr *)&addr, &len); | |
659743b0 | 797 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
798 | if (rc) |
799 | return rc; | |
800 | ||
801 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
802 | &addr, param, buf); | |
803 | default: | |
804 | return iscsi_host_get_param(shost, param, buf); | |
805 | } | |
806 | ||
807 | return 0; | |
fd7255f5 MC |
808 | } |
809 | ||
7ba24713 | 810 | static void |
38e1a8f5 MC |
811 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
812 | struct iscsi_stats *stats) | |
7ba24713 | 813 | { |
7b7232f3 | 814 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 815 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 816 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 817 | |
7ba24713 AA |
818 | stats->custom_length = 3; |
819 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 820 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 821 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 822 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
823 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
824 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
825 | |
826 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
827 | } |
828 | ||
5bb0b55a | 829 | static struct iscsi_cls_session * |
38e1a8f5 | 830 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 831 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 832 | { |
5bb0b55a MC |
833 | struct iscsi_cls_session *cls_session; |
834 | struct iscsi_session *session; | |
a79af8a6 | 835 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 836 | struct Scsi_Host *shost; |
7ba24713 | 837 | |
06520ede MC |
838 | if (ep) { |
839 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
840 | return NULL; |
841 | } | |
842 | ||
a79af8a6 MC |
843 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
844 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 845 | if (!shost) |
5bb0b55a | 846 | return NULL; |
38e1a8f5 | 847 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 848 | shost->cmd_per_lun = qdepth; |
75613521 MC |
849 | shost->max_lun = iscsi_max_lun; |
850 | shost->max_id = 0; | |
851 | shost->max_channel = 0; | |
30e9ba9f | 852 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 853 | |
a4804cd6 | 854 | if (iscsi_host_add(shost, NULL)) |
75613521 | 855 | goto free_host; |
75613521 | 856 | |
38e1a8f5 | 857 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 858 | cmds_max, 0, |
38e1a8f5 MC |
859 | sizeof(struct iscsi_tcp_task) + |
860 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 861 | initial_cmdsn, 0); |
75613521 MC |
862 | if (!cls_session) |
863 | goto remove_host; | |
864 | session = cls_session->dd_data; | |
a79af8a6 MC |
865 | tcp_sw_host = iscsi_host_priv(shost); |
866 | tcp_sw_host->session = session; | |
7ba24713 | 867 | |
fbc514b4 | 868 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 869 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 870 | goto remove_session; |
5bb0b55a MC |
871 | return cls_session; |
872 | ||
75613521 | 873 | remove_session: |
5bb0b55a | 874 | iscsi_session_teardown(cls_session); |
75613521 | 875 | remove_host: |
a4804cd6 | 876 | iscsi_host_remove(shost); |
75613521 | 877 | free_host: |
a4804cd6 | 878 | iscsi_host_free(shost); |
5bb0b55a MC |
879 | return NULL; |
880 | } | |
881 | ||
38e1a8f5 | 882 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 883 | { |
75613521 MC |
884 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
885 | ||
38e1a8f5 | 886 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 887 | iscsi_session_teardown(cls_session); |
75613521 | 888 | |
a4804cd6 MC |
889 | iscsi_host_remove(shost); |
890 | iscsi_host_free(shost); | |
7ba24713 AA |
891 | } |
892 | ||
587a1f16 | 893 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
894 | { |
895 | switch (param_type) { | |
f27fb2ef MC |
896 | case ISCSI_HOST_PARAM: |
897 | switch (param) { | |
898 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
899 | case ISCSI_HOST_PARAM_HWADDRESS: | |
900 | case ISCSI_HOST_PARAM_IPADDRESS: | |
901 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
902 | return S_IRUGO; | |
903 | default: | |
904 | return 0; | |
905 | } | |
3128c6c7 MC |
906 | case ISCSI_PARAM: |
907 | switch (param) { | |
908 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
909 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
910 | case ISCSI_PARAM_HDRDGST_EN: | |
911 | case ISCSI_PARAM_DATADGST_EN: | |
912 | case ISCSI_PARAM_CONN_ADDRESS: | |
913 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 914 | case ISCSI_PARAM_LOCAL_PORT: |
3128c6c7 MC |
915 | case ISCSI_PARAM_EXP_STATSN: |
916 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
917 | case ISCSI_PARAM_PERSISTENT_PORT: | |
918 | case ISCSI_PARAM_PING_TMO: | |
919 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
920 | case ISCSI_PARAM_INITIAL_R2T_EN: |
921 | case ISCSI_PARAM_MAX_R2T: | |
922 | case ISCSI_PARAM_IMM_DATA_EN: | |
923 | case ISCSI_PARAM_FIRST_BURST: | |
924 | case ISCSI_PARAM_MAX_BURST: | |
925 | case ISCSI_PARAM_PDU_INORDER_EN: | |
926 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
927 | case ISCSI_PARAM_ERL: | |
928 | case ISCSI_PARAM_TARGET_NAME: | |
929 | case ISCSI_PARAM_TPGT: | |
930 | case ISCSI_PARAM_USERNAME: | |
931 | case ISCSI_PARAM_PASSWORD: | |
932 | case ISCSI_PARAM_USERNAME_IN: | |
933 | case ISCSI_PARAM_PASSWORD_IN: | |
934 | case ISCSI_PARAM_FAST_ABORT: | |
935 | case ISCSI_PARAM_ABORT_TMO: | |
936 | case ISCSI_PARAM_LU_RESET_TMO: | |
937 | case ISCSI_PARAM_TGT_RESET_TMO: | |
938 | case ISCSI_PARAM_IFACE_NAME: | |
939 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
940 | return S_IRUGO; |
941 | default: | |
942 | return 0; | |
943 | } | |
944 | } | |
945 | ||
946 | return 0; | |
947 | } | |
948 | ||
091e6dbe PW |
949 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
950 | { | |
951 | set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags); | |
952 | return 0; | |
953 | } | |
954 | ||
38e1a8f5 | 955 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 956 | { |
b6d44fe9 | 957 | blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY); |
d1d81c01 MC |
958 | blk_queue_dma_alignment(sdev->request_queue, 0); |
959 | return 0; | |
960 | } | |
961 | ||
38e1a8f5 | 962 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 963 | .module = THIS_MODULE, |
f4246b33 | 964 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a | 965 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 966 | .change_queue_depth = scsi_change_queue_depth, |
1548271e | 967 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 968 | .sg_tablesize = 4096, |
8231f0ed | 969 | .max_sectors = 0xFFFF, |
5bb0b55a | 970 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
b6a05c82 | 971 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
5bb0b55a | 972 | .eh_abort_handler = iscsi_eh_abort, |
843c0a8a | 973 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 974 | .eh_target_reset_handler = iscsi_eh_recover_target, |
5bb0b55a | 975 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 976 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 977 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 978 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
979 | .proc_name = "iscsi_tcp", |
980 | .this_id = -1, | |
c40ecc12 | 981 | .track_queue_depth = 1, |
5bb0b55a MC |
982 | }; |
983 | ||
38e1a8f5 | 984 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
985 | .owner = THIS_MODULE, |
986 | .name = "tcp", | |
987 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
988 | | CAP_DATADGST, | |
5bb0b55a | 989 | /* session management */ |
38e1a8f5 MC |
990 | .create_session = iscsi_sw_tcp_session_create, |
991 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 992 | /* connection management */ |
38e1a8f5 MC |
993 | .create_conn = iscsi_sw_tcp_conn_create, |
994 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
995 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 996 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
997 | .set_param = iscsi_sw_tcp_conn_set_param, |
998 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 999 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1000 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 1001 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 1002 | /* iscsi host params */ |
a79af8a6 | 1003 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 1004 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1005 | /* IO */ |
7ba24713 | 1006 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 1007 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 1008 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1009 | .init_task = iscsi_tcp_task_init, |
1010 | .xmit_task = iscsi_tcp_task_xmit, | |
1011 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 1012 | /* low level pdu helpers */ |
38e1a8f5 MC |
1013 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
1014 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
1015 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 1016 | /* recovery */ |
30a6c652 | 1017 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1018 | }; |
1019 | ||
38e1a8f5 | 1020 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1021 | { |
7ba24713 | 1022 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1023 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1024 | iscsi_max_lun); | |
7ba24713 AA |
1025 | return -EINVAL; |
1026 | } | |
7ba24713 | 1027 | |
38e1a8f5 MC |
1028 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1029 | &iscsi_sw_tcp_transport); | |
1030 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1031 | return -ENODEV; |
7ba24713 | 1032 | |
7b8631b5 | 1033 | return 0; |
7ba24713 AA |
1034 | } |
1035 | ||
38e1a8f5 | 1036 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1037 | { |
38e1a8f5 | 1038 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1039 | } |
1040 | ||
38e1a8f5 MC |
1041 | module_init(iscsi_sw_tcp_init); |
1042 | module_exit(iscsi_sw_tcp_exit); |