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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> |
89d0c804 | 40 | #include <linux/backing-dev.h> |
7ba24713 AA |
41 | #include <net/tcp.h> |
42 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 43 | #include <scsi/scsi_device.h> |
7ba24713 AA |
44 | #include <scsi/scsi_host.h> |
45 | #include <scsi/scsi.h> | |
46 | #include <scsi/scsi_transport_iscsi.h> | |
47 | ||
48 | #include "iscsi_tcp.h" | |
49 | ||
38e1a8f5 MC |
50 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
51 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
52 | "Alex Aizman <itn780@yahoo.com>"); |
53 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
54 | MODULE_LICENSE("GPL"); | |
7ba24713 | 55 | |
38e1a8f5 MC |
56 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
57 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
58 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 59 | |
c0e4eaae | 60 | static unsigned int iscsi_max_lun = ~0; |
7ba24713 AA |
61 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
62 | ||
c93f87c7 MC |
63 | static int iscsi_sw_tcp_dbg; |
64 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
65 | S_IRUGO | S_IWUSR); | |
66 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
67 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
68 | ||
69 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
70 | do { \ | |
71 | if (iscsi_sw_tcp_dbg) \ | |
72 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
73 | "%s " dbg_fmt, \ | |
74 | __func__, ##arg); \ | |
75 | } while (0); | |
76 | ||
77 | ||
da32dd68 | 78 | /** |
38e1a8f5 | 79 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
80 | * @rd_desc: read descriptor |
81 | * @skb: socket buffer | |
82 | * @offset: offset in skb | |
83 | * @len: skb->len - offset | |
38e1a8f5 MC |
84 | */ |
85 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
86 | unsigned int offset, size_t len) | |
63c62f1c MC |
87 | { |
88 | struct iscsi_conn *conn = rd_desc->arg.data; | |
89 | unsigned int consumed, total_consumed = 0; | |
90 | int status; | |
91 | ||
c93f87c7 | 92 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
93 | |
94 | do { | |
95 | status = 0; | |
96 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
97 | offset += consumed; | |
98 | total_consumed += consumed; | |
99 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
100 | ||
c93f87c7 MC |
101 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
102 | skb->len - offset, status); | |
63c62f1c | 103 | return total_consumed; |
7ba24713 AA |
104 | } |
105 | ||
523eeac6 HR |
106 | /** |
107 | * iscsi_sw_sk_state_check - check socket state | |
108 | * @sk: socket | |
109 | * | |
110 | * If the socket is in CLOSE or CLOSE_WAIT we should | |
111 | * not close the connection if there is still some | |
112 | * data pending. | |
03adb5f9 MC |
113 | * |
114 | * Must be called with sk_callback_lock. | |
523eeac6 HR |
115 | */ |
116 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
117 | { | |
03adb5f9 | 118 | struct iscsi_conn *conn = sk->sk_user_data; |
523eeac6 | 119 | |
d1af8a32 | 120 | if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
c712495e | 121 | (conn->session->state != ISCSI_STATE_LOGGING_OUT) && |
d1af8a32 MC |
122 | !atomic_read(&sk->sk_rmem_alloc)) { |
123 | ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
124 | iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); | |
125 | return -ECONNRESET; | |
126 | } | |
523eeac6 HR |
127 | return 0; |
128 | } | |
129 | ||
676d2369 | 130 | static void iscsi_sw_tcp_data_ready(struct sock *sk) |
7ba24713 | 131 | { |
03adb5f9 MC |
132 | struct iscsi_conn *conn; |
133 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 AA |
134 | read_descriptor_t rd_desc; |
135 | ||
7cb001d4 | 136 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
137 | conn = sk->sk_user_data; |
138 | if (!conn) { | |
7cb001d4 | 139 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
140 | return; |
141 | } | |
142 | tcp_conn = conn->dd_data; | |
7ba24713 | 143 | |
665b44ae | 144 | /* |
da32dd68 | 145 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 146 | * We set count to 1 because we want the network layer to |
da32dd68 | 147 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
148 | * handled pdus that cross buffers or pdus that still need data. |
149 | */ | |
7ba24713 | 150 | rd_desc.arg.data = conn; |
665b44ae | 151 | rd_desc.count = 1; |
38e1a8f5 | 152 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 153 | |
d1af8a32 | 154 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 155 | |
da32dd68 OK |
156 | /* If we had to (atomically) map a highmem page, |
157 | * unmap it now. */ | |
a8ac6311 | 158 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7cb001d4 | 159 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
160 | } |
161 | ||
38e1a8f5 | 162 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 163 | { |
5bb0b55a | 164 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 165 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 166 | struct iscsi_conn *conn; |
7ba24713 AA |
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 | 175 | |
d1af8a32 | 176 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 177 | |
5bb0b55a | 178 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
179 | tcp_sw_conn = tcp_conn->dd_data; |
180 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 | 181 | |
7cb001d4 | 182 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
183 | |
184 | old_state_change(sk); | |
185 | } | |
186 | ||
187 | /** | |
188 | * iscsi_write_space - Called when more output buffer space is available | |
189 | * @sk: socket space is available for | |
190 | **/ | |
38e1a8f5 | 191 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 192 | { |
03adb5f9 MC |
193 | struct iscsi_conn *conn; |
194 | struct iscsi_tcp_conn *tcp_conn; | |
195 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
196 | void (*old_write_space)(struct sock *); | |
197 | ||
198 | read_lock_bh(&sk->sk_callback_lock); | |
199 | conn = sk->sk_user_data; | |
200 | if (!conn) { | |
201 | read_unlock_bh(&sk->sk_callback_lock); | |
202 | return; | |
203 | } | |
204 | ||
205 | tcp_conn = conn->dd_data; | |
206 | tcp_sw_conn = tcp_conn->dd_data; | |
207 | old_write_space = tcp_sw_conn->old_write_space; | |
208 | read_unlock_bh(&sk->sk_callback_lock); | |
209 | ||
210 | old_write_space(sk); | |
5bb0b55a | 211 | |
c93f87c7 | 212 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 213 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
214 | } |
215 | ||
38e1a8f5 | 216 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 217 | { |
5bb0b55a | 218 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
219 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
220 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
221 | |
222 | /* assign new callbacks */ | |
223 | write_lock_bh(&sk->sk_callback_lock); | |
224 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
225 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
226 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
227 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
228 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
229 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
230 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
231 | write_unlock_bh(&sk->sk_callback_lock); |
232 | } | |
233 | ||
38e1a8f5 | 234 | static void |
c484a50a | 235 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 236 | { |
c484a50a AK |
237 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
238 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 239 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
240 | |
241 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
242 | write_lock_bh(&sk->sk_callback_lock); | |
243 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
244 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
245 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
246 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
28448b80 | 247 | sk->sk_no_check_tx = 0; |
7ba24713 AA |
248 | write_unlock_bh(&sk->sk_callback_lock); |
249 | } | |
250 | ||
251 | /** | |
38e1a8f5 | 252 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 253 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
254 | * @segment: the buffer to transmnit |
255 | * | |
256 | * This function transmits as much of the buffer as | |
257 | * the network layer will accept, and returns the number of | |
258 | * bytes transmitted. | |
259 | * | |
260 | * If CRC hashing is enabled, the function will compute the | |
261 | * hash as it goes. When the entire segment has been transmitted, | |
262 | * it will retrieve the hash value and send it as well. | |
263 | */ | |
6df19a79 | 264 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
265 | struct iscsi_segment *segment) |
266 | { | |
6df19a79 | 267 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
268 | struct socket *sk = tcp_sw_conn->sock; |
269 | unsigned int copied = 0; | |
270 | int r = 0; | |
271 | ||
6df19a79 | 272 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
273 | struct scatterlist *sg; |
274 | unsigned int offset, copy; | |
275 | int flags = 0; | |
276 | ||
277 | r = 0; | |
278 | offset = segment->copied; | |
279 | copy = segment->size - offset; | |
280 | ||
281 | if (segment->total_copied + segment->size < segment->total_size) | |
282 | flags |= MSG_MORE; | |
283 | ||
284 | /* Use sendpage if we can; else fall back to sendmsg */ | |
285 | if (!segment->data) { | |
286 | sg = segment->sg; | |
287 | offset += segment->sg_offset + sg->offset; | |
288 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
289 | copy, flags); | |
290 | } else { | |
291 | struct msghdr msg = { .msg_flags = flags }; | |
292 | struct kvec iov = { | |
293 | .iov_base = segment->data + offset, | |
294 | .iov_len = copy | |
295 | }; | |
296 | ||
297 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
298 | } | |
299 | ||
300 | if (r < 0) { | |
301 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
302 | return r; |
303 | } | |
304 | copied += r; | |
305 | } | |
306 | return copied; | |
307 | } | |
308 | ||
309 | /** | |
310 | * iscsi_sw_tcp_xmit - TCP transmit | |
ccd4a430 | 311 | * @conn: iscsi connection |
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 | 361 | * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit |
ccd4a430 | 362 | * @conn: iscsi connection |
a8ac6311 | 363 | */ |
38e1a8f5 | 364 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 365 | { |
a8ac6311 | 366 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
367 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
368 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 369 | |
a8ac6311 | 370 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
371 | } |
372 | ||
38e1a8f5 | 373 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 374 | { |
e5a7efef | 375 | struct iscsi_conn *conn = task->conn; |
f1083048 | 376 | unsigned int noreclaim_flag; |
9e45dd73 MC |
377 | int rc = 0; |
378 | ||
f1083048 | 379 | noreclaim_flag = memalloc_noreclaim_save(); |
a8ac6311 | 380 | |
38e1a8f5 MC |
381 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
382 | rc = iscsi_sw_tcp_xmit(conn); | |
9e45dd73 MC |
383 | if (rc == 0) { |
384 | rc = -EAGAIN; | |
385 | break; | |
386 | } | |
a8ac6311 | 387 | if (rc < 0) |
9e45dd73 MC |
388 | break; |
389 | rc = 0; | |
3219e529 | 390 | } |
7ba24713 | 391 | |
f1083048 | 392 | memalloc_noreclaim_restore(noreclaim_flag); |
9e45dd73 | 393 | return rc; |
7ba24713 AA |
394 | } |
395 | ||
a8ac6311 OK |
396 | /* |
397 | * This is called when we're done sending the header. | |
398 | * Simply copy the data_segment to the send segment, and return. | |
399 | */ | |
38e1a8f5 MC |
400 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
401 | struct iscsi_segment *segment) | |
7ba24713 | 402 | { |
38e1a8f5 MC |
403 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
404 | ||
405 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
406 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
407 | "Header done. Next segment size %u total_size %u\n", | |
408 | tcp_sw_conn->out.segment.size, | |
409 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
410 | return 0; |
411 | } | |
412 | ||
38e1a8f5 MC |
413 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
414 | size_t hdrlen) | |
a8ac6311 OK |
415 | { |
416 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 417 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 418 | |
c93f87c7 MC |
419 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
420 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
421 | |
422 | /* Clear the data segment - needs to be filled in by the | |
423 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
424 | memset(&tcp_sw_conn->out.data_segment, 0, |
425 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
426 | |
427 | /* If header digest is enabled, compute the CRC and | |
428 | * place the digest into the same buffer. We make | |
135a8ad4 | 429 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
430 | * sufficient room. |
431 | */ | |
432 | if (conn->hdrdgst_en) { | |
5d6ac29b | 433 | iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
434 | hdr + hdrlen); |
435 | hdrlen += ISCSI_DIGEST_SIZE; | |
436 | } | |
437 | ||
438 | /* Remember header pointer for later, when we need | |
439 | * to decide whether there's a payload to go along | |
440 | * with the header. */ | |
38e1a8f5 | 441 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 442 | |
38e1a8f5 MC |
443 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
444 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
445 | } |
446 | ||
447 | /* | |
448 | * Prepare the send buffer for the payload data. | |
449 | * Padding and checksumming will all be taken care | |
450 | * of by the iscsi_segment routines. | |
451 | */ | |
452 | static int | |
38e1a8f5 MC |
453 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
454 | unsigned int count, unsigned int offset, | |
455 | unsigned int len) | |
a8ac6311 OK |
456 | { |
457 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 458 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 459 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
460 | unsigned int hdr_spec_len; |
461 | ||
c93f87c7 MC |
462 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
463 | conn->datadgst_en ? | |
464 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
465 | |
466 | /* Make sure the datalen matches what the caller | |
467 | said he would send. */ | |
38e1a8f5 | 468 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
469 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
470 | ||
471 | if (conn->datadgst_en) | |
5d6ac29b | 472 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 473 | |
38e1a8f5 MC |
474 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
475 | sg, count, offset, len, | |
476 | NULL, tx_hash); | |
a8ac6311 OK |
477 | } |
478 | ||
479 | static void | |
38e1a8f5 | 480 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
481 | size_t len) |
482 | { | |
483 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 484 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 485 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
486 | unsigned int hdr_spec_len; |
487 | ||
c93f87c7 MC |
488 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
489 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
490 | |
491 | /* Make sure the datalen matches what the caller | |
492 | said he would send. */ | |
38e1a8f5 | 493 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
494 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
495 | ||
496 | if (conn->datadgst_en) | |
5d6ac29b | 497 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 498 | |
38e1a8f5 | 499 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 500 | data, len, NULL, tx_hash); |
7ba24713 AA |
501 | } |
502 | ||
38e1a8f5 MC |
503 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
504 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
505 | { |
506 | struct iscsi_conn *conn = task->conn; | |
507 | int err = 0; | |
508 | ||
38e1a8f5 | 509 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
510 | |
511 | if (!count) | |
512 | return 0; | |
513 | ||
514 | if (!task->sc) | |
38e1a8f5 | 515 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef MC |
516 | else { |
517 | struct scsi_data_buffer *sdb = scsi_out(task->sc); | |
518 | ||
38e1a8f5 MC |
519 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
520 | sdb->table.nents, offset, | |
521 | count); | |
e5a7efef MC |
522 | } |
523 | ||
524 | if (err) { | |
9a6510eb | 525 | /* got invalid offset/len */ |
e5a7efef MC |
526 | return -EIO; |
527 | } | |
528 | return 0; | |
529 | } | |
530 | ||
2ff79d52 | 531 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 532 | { |
135a8ad4 | 533 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 534 | |
38e1a8f5 MC |
535 | task->hdr = task->dd_data + sizeof(*tcp_task); |
536 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 537 | return 0; |
7ba24713 AA |
538 | } |
539 | ||
5bb0b55a | 540 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
541 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
542 | uint32_t conn_idx) | |
7ba24713 | 543 | { |
5bb0b55a MC |
544 | struct iscsi_conn *conn; |
545 | struct iscsi_cls_conn *cls_conn; | |
546 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 547 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
5d6ac29b | 548 | struct crypto_ahash *tfm; |
7ba24713 | 549 | |
38e1a8f5 MC |
550 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
551 | conn_idx); | |
5bb0b55a MC |
552 | if (!cls_conn) |
553 | return NULL; | |
554 | conn = cls_conn->dd_data; | |
5d91e209 | 555 | tcp_conn = conn->dd_data; |
38e1a8f5 | 556 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 557 | |
5d6ac29b HX |
558 | tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
559 | if (IS_ERR(tfm)) | |
5d91e209 | 560 | goto free_conn; |
dd8c0d95 | 561 | |
5d6ac29b HX |
562 | tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
563 | if (!tcp_sw_conn->tx_hash) | |
564 | goto free_tfm; | |
565 | ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL); | |
566 | ||
567 | tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); | |
568 | if (!tcp_sw_conn->rx_hash) | |
569 | goto free_tx_hash; | |
570 | ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL); | |
571 | ||
572 | tcp_conn->rx_hash = tcp_sw_conn->rx_hash; | |
dd8c0d95 | 573 | |
5bb0b55a | 574 | return cls_conn; |
7ba24713 | 575 | |
5d6ac29b HX |
576 | free_tx_hash: |
577 | ahash_request_free(tcp_sw_conn->tx_hash); | |
578 | free_tfm: | |
579 | crypto_free_ahash(tfm); | |
5d91e209 | 580 | free_conn: |
322d739d MC |
581 | iscsi_conn_printk(KERN_ERR, conn, |
582 | "Could not create connection due to crc32c " | |
583 | "loading error. Make sure the crc32c " | |
584 | "module is built as a module or into the " | |
585 | "kernel\n"); | |
38e1a8f5 | 586 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 587 | return NULL; |
7ba24713 AA |
588 | } |
589 | ||
38e1a8f5 | 590 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 591 | { |
22236961 | 592 | struct iscsi_session *session = conn->session; |
1c83469d | 593 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
594 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
595 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 596 | |
22236961 | 597 | if (!sock) |
1c83469d MC |
598 | return; |
599 | ||
22236961 | 600 | sock_hold(sock->sk); |
c484a50a | 601 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 602 | sock_put(sock->sk); |
1c83469d | 603 | |
659743b0 | 604 | spin_lock_bh(&session->frwd_lock); |
38e1a8f5 | 605 | tcp_sw_conn->sock = NULL; |
659743b0 | 606 | spin_unlock_bh(&session->frwd_lock); |
22236961 | 607 | sockfd_put(sock); |
1c83469d MC |
608 | } |
609 | ||
38e1a8f5 | 610 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 611 | { |
5bb0b55a MC |
612 | struct iscsi_conn *conn = cls_conn->dd_data; |
613 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 614 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 615 | |
38e1a8f5 | 616 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 617 | |
5d6ac29b HX |
618 | ahash_request_free(tcp_sw_conn->rx_hash); |
619 | if (tcp_sw_conn->tx_hash) { | |
620 | struct crypto_ahash *tfm; | |
621 | ||
622 | tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash); | |
623 | ahash_request_free(tcp_sw_conn->tx_hash); | |
624 | crypto_free_ahash(tfm); | |
625 | } | |
7ba24713 | 626 | |
38e1a8f5 | 627 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 628 | } |
7ba24713 | 629 | |
38e1a8f5 | 630 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
631 | { |
632 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 633 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 634 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 635 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
636 | |
637 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 638 | if (!sock) |
913e5bf4 | 639 | return; |
1c83469d | 640 | |
8c38a295 MC |
641 | sock->sk->sk_err = EIO; |
642 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 643 | |
03adb5f9 MC |
644 | /* stop xmit side */ |
645 | iscsi_suspend_tx(conn); | |
646 | ||
647 | /* stop recv side and release socket */ | |
38e1a8f5 | 648 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
649 | |
650 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
651 | } |
652 | ||
5bb0b55a | 653 | static int |
38e1a8f5 MC |
654 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
655 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
656 | int is_leading) | |
5bb0b55a | 657 | { |
a79af8a6 | 658 | struct iscsi_session *session = cls_session->dd_data; |
5bb0b55a MC |
659 | struct iscsi_conn *conn = cls_conn->dd_data; |
660 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 661 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
662 | struct sock *sk; |
663 | struct socket *sock; | |
664 | int err; | |
7ba24713 | 665 | |
5bb0b55a | 666 | /* lookup for existing socket */ |
264faaaa | 667 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 668 | if (!sock) { |
322d739d MC |
669 | iscsi_conn_printk(KERN_ERR, conn, |
670 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 671 | return -EEXIST; |
7ba24713 AA |
672 | } |
673 | ||
5bb0b55a MC |
674 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
675 | if (err) | |
22236961 | 676 | goto free_socket; |
7ba24713 | 677 | |
659743b0 | 678 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 679 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 680 | tcp_sw_conn->sock = sock; |
659743b0 | 681 | spin_unlock_bh(&session->frwd_lock); |
7ba24713 | 682 | |
67a61114 MC |
683 | /* setup Socket parameters */ |
684 | sk = sock->sk; | |
4a17fd52 | 685 | sk->sk_reuse = SK_CAN_REUSE; |
67a61114 MC |
686 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
687 | sk->sk_allocation = GFP_ATOMIC; | |
9e45dd73 | 688 | sk_set_memalloc(sk); |
7ba24713 | 689 | |
38e1a8f5 MC |
690 | iscsi_sw_tcp_conn_set_callbacks(conn); |
691 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
692 | /* |
693 | * set receive state machine into initial state | |
694 | */ | |
da32dd68 | 695 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 696 | return 0; |
22236961 MC |
697 | |
698 | free_socket: | |
699 | sockfd_put(sock); | |
700 | return err; | |
7ba24713 AA |
701 | } |
702 | ||
38e1a8f5 MC |
703 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
704 | enum iscsi_param param, char *buf, | |
705 | int buflen) | |
7ba24713 | 706 | { |
7b7232f3 | 707 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 708 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 709 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 710 | |
7ba24713 | 711 | switch(param) { |
7ba24713 | 712 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 713 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
714 | break; |
715 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 716 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
717 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
718 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 719 | break; |
7ba24713 | 720 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 721 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 722 | default: |
5c75b7fc | 723 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
724 | } |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
38e1a8f5 MC |
729 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
730 | enum iscsi_param param, char *buf) | |
7b8631b5 | 731 | { |
7b7232f3 | 732 | struct iscsi_conn *conn = cls_conn->dd_data; |
a79af8a6 MC |
733 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
734 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
735 | struct sockaddr_in6 addr; | |
9b2c45d4 | 736 | int rc; |
7b8631b5 MC |
737 | |
738 | switch(param) { | |
fd7255f5 | 739 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 740 | case ISCSI_PARAM_CONN_ADDRESS: |
4bfb8ebf | 741 | case ISCSI_PARAM_LOCAL_PORT: |
659743b0 | 742 | spin_lock_bh(&conn->session->frwd_lock); |
a79af8a6 | 743 | if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
659743b0 | 744 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
745 | return -ENOTCONN; |
746 | } | |
4bfb8ebf MC |
747 | if (param == ISCSI_PARAM_LOCAL_PORT) |
748 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
9b2c45d4 | 749 | (struct sockaddr *)&addr); |
4bfb8ebf MC |
750 | else |
751 | rc = kernel_getpeername(tcp_sw_conn->sock, | |
9b2c45d4 | 752 | (struct sockaddr *)&addr); |
659743b0 | 753 | spin_unlock_bh(&conn->session->frwd_lock); |
9b2c45d4 | 754 | if (rc < 0) |
a79af8a6 MC |
755 | return rc; |
756 | ||
757 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
758 | &addr, param, buf); | |
fd7255f5 | 759 | default: |
5c75b7fc | 760 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
761 | } |
762 | ||
a79af8a6 MC |
763 | return 0; |
764 | } | |
765 | ||
766 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
767 | enum iscsi_host_param param, char *buf) | |
768 | { | |
769 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
770 | struct iscsi_session *session = tcp_sw_host->session; | |
771 | struct iscsi_conn *conn; | |
772 | struct iscsi_tcp_conn *tcp_conn; | |
773 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
774 | struct sockaddr_in6 addr; | |
9b2c45d4 | 775 | int rc; |
a79af8a6 MC |
776 | |
777 | switch (param) { | |
778 | case ISCSI_HOST_PARAM_IPADDRESS: | |
eee2b5c8 MC |
779 | if (!session) |
780 | return -ENOTCONN; | |
781 | ||
659743b0 | 782 | spin_lock_bh(&session->frwd_lock); |
a79af8a6 MC |
783 | conn = session->leadconn; |
784 | if (!conn) { | |
659743b0 | 785 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
786 | return -ENOTCONN; |
787 | } | |
788 | tcp_conn = conn->dd_data; | |
789 | ||
790 | tcp_sw_conn = tcp_conn->dd_data; | |
791 | if (!tcp_sw_conn->sock) { | |
659743b0 | 792 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
793 | return -ENOTCONN; |
794 | } | |
795 | ||
796 | rc = kernel_getsockname(tcp_sw_conn->sock, | |
9b2c45d4 | 797 | (struct sockaddr *)&addr); |
659743b0 | 798 | spin_unlock_bh(&session->frwd_lock); |
9b2c45d4 | 799 | if (rc < 0) |
a79af8a6 MC |
800 | return rc; |
801 | ||
802 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
803 | &addr, param, buf); | |
804 | default: | |
805 | return iscsi_host_get_param(shost, param, buf); | |
806 | } | |
807 | ||
808 | return 0; | |
fd7255f5 MC |
809 | } |
810 | ||
7ba24713 | 811 | static void |
38e1a8f5 MC |
812 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
813 | struct iscsi_stats *stats) | |
7ba24713 | 814 | { |
7b7232f3 | 815 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 816 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 817 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 818 | |
7ba24713 AA |
819 | stats->custom_length = 3; |
820 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 821 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 822 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 823 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
824 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
825 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
826 | |
827 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
828 | } |
829 | ||
5bb0b55a | 830 | static struct iscsi_cls_session * |
38e1a8f5 | 831 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 832 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 833 | { |
5bb0b55a MC |
834 | struct iscsi_cls_session *cls_session; |
835 | struct iscsi_session *session; | |
a79af8a6 | 836 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 837 | struct Scsi_Host *shost; |
7ba24713 | 838 | |
06520ede MC |
839 | if (ep) { |
840 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
841 | return NULL; |
842 | } | |
843 | ||
a79af8a6 MC |
844 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
845 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 846 | if (!shost) |
5bb0b55a | 847 | return NULL; |
38e1a8f5 | 848 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 849 | shost->cmd_per_lun = qdepth; |
75613521 MC |
850 | shost->max_lun = iscsi_max_lun; |
851 | shost->max_id = 0; | |
852 | shost->max_channel = 0; | |
30e9ba9f | 853 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 854 | |
a4804cd6 | 855 | if (iscsi_host_add(shost, NULL)) |
75613521 | 856 | goto free_host; |
75613521 | 857 | |
38e1a8f5 | 858 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 859 | cmds_max, 0, |
38e1a8f5 MC |
860 | sizeof(struct iscsi_tcp_task) + |
861 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 862 | initial_cmdsn, 0); |
75613521 MC |
863 | if (!cls_session) |
864 | goto remove_host; | |
865 | session = cls_session->dd_data; | |
a79af8a6 MC |
866 | tcp_sw_host = iscsi_host_priv(shost); |
867 | tcp_sw_host->session = session; | |
7ba24713 | 868 | |
fbc514b4 | 869 | shost->can_queue = session->scsi_cmds_max; |
38e1a8f5 | 870 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 871 | goto remove_session; |
5bb0b55a MC |
872 | return cls_session; |
873 | ||
75613521 | 874 | remove_session: |
5bb0b55a | 875 | iscsi_session_teardown(cls_session); |
75613521 | 876 | remove_host: |
a4804cd6 | 877 | iscsi_host_remove(shost); |
75613521 | 878 | free_host: |
a4804cd6 | 879 | iscsi_host_free(shost); |
5bb0b55a MC |
880 | return NULL; |
881 | } | |
882 | ||
38e1a8f5 | 883 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 884 | { |
75613521 MC |
885 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
886 | ||
38e1a8f5 | 887 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 888 | iscsi_session_teardown(cls_session); |
75613521 | 889 | |
a4804cd6 MC |
890 | iscsi_host_remove(shost); |
891 | iscsi_host_free(shost); | |
7ba24713 AA |
892 | } |
893 | ||
587a1f16 | 894 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
895 | { |
896 | switch (param_type) { | |
f27fb2ef MC |
897 | case ISCSI_HOST_PARAM: |
898 | switch (param) { | |
899 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
900 | case ISCSI_HOST_PARAM_HWADDRESS: | |
901 | case ISCSI_HOST_PARAM_IPADDRESS: | |
902 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
903 | return S_IRUGO; | |
904 | default: | |
905 | return 0; | |
906 | } | |
3128c6c7 MC |
907 | case ISCSI_PARAM: |
908 | switch (param) { | |
909 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
910 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
911 | case ISCSI_PARAM_HDRDGST_EN: | |
912 | case ISCSI_PARAM_DATADGST_EN: | |
913 | case ISCSI_PARAM_CONN_ADDRESS: | |
914 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 915 | case ISCSI_PARAM_LOCAL_PORT: |
3128c6c7 MC |
916 | case ISCSI_PARAM_EXP_STATSN: |
917 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
918 | case ISCSI_PARAM_PERSISTENT_PORT: | |
919 | case ISCSI_PARAM_PING_TMO: | |
920 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
921 | case ISCSI_PARAM_INITIAL_R2T_EN: |
922 | case ISCSI_PARAM_MAX_R2T: | |
923 | case ISCSI_PARAM_IMM_DATA_EN: | |
924 | case ISCSI_PARAM_FIRST_BURST: | |
925 | case ISCSI_PARAM_MAX_BURST: | |
926 | case ISCSI_PARAM_PDU_INORDER_EN: | |
927 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
928 | case ISCSI_PARAM_ERL: | |
929 | case ISCSI_PARAM_TARGET_NAME: | |
930 | case ISCSI_PARAM_TPGT: | |
931 | case ISCSI_PARAM_USERNAME: | |
932 | case ISCSI_PARAM_PASSWORD: | |
933 | case ISCSI_PARAM_USERNAME_IN: | |
934 | case ISCSI_PARAM_PASSWORD_IN: | |
935 | case ISCSI_PARAM_FAST_ABORT: | |
936 | case ISCSI_PARAM_ABORT_TMO: | |
937 | case ISCSI_PARAM_LU_RESET_TMO: | |
938 | case ISCSI_PARAM_TGT_RESET_TMO: | |
939 | case ISCSI_PARAM_IFACE_NAME: | |
940 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
941 | return S_IRUGO; |
942 | default: | |
943 | return 0; | |
944 | } | |
945 | } | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
091e6dbe PW |
950 | static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev) |
951 | { | |
bc74c33e | 952 | blk_queue_flag_set(QUEUE_FLAG_BIDI, sdev->request_queue); |
091e6dbe PW |
953 | return 0; |
954 | } | |
955 | ||
38e1a8f5 | 956 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 957 | { |
89d0c804 JW |
958 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); |
959 | struct iscsi_session *session = tcp_sw_host->session; | |
960 | struct iscsi_conn *conn = session->leadconn; | |
961 | ||
962 | if (conn->datadgst_en) | |
963 | sdev->request_queue->backing_dev_info->capabilities | |
964 | |= BDI_CAP_STABLE_WRITES; | |
d1d81c01 MC |
965 | blk_queue_dma_alignment(sdev->request_queue, 0); |
966 | return 0; | |
967 | } | |
968 | ||
38e1a8f5 | 969 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 970 | .module = THIS_MODULE, |
f4246b33 | 971 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a | 972 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 973 | .change_queue_depth = scsi_change_queue_depth, |
1548271e | 974 | .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1, |
66bbe0ce | 975 | .sg_tablesize = 4096, |
8231f0ed | 976 | .max_sectors = 0xFFFF, |
5bb0b55a | 977 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
b6a05c82 | 978 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
5bb0b55a | 979 | .eh_abort_handler = iscsi_eh_abort, |
843c0a8a | 980 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 981 | .eh_target_reset_handler = iscsi_eh_recover_target, |
5bb0b55a | 982 | .use_clustering = DISABLE_CLUSTERING, |
091e6dbe | 983 | .slave_alloc = iscsi_sw_tcp_slave_alloc, |
38e1a8f5 | 984 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 985 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
986 | .proc_name = "iscsi_tcp", |
987 | .this_id = -1, | |
c40ecc12 | 988 | .track_queue_depth = 1, |
5bb0b55a MC |
989 | }; |
990 | ||
38e1a8f5 | 991 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
992 | .owner = THIS_MODULE, |
993 | .name = "tcp", | |
994 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
995 | | CAP_DATADGST, | |
5bb0b55a | 996 | /* session management */ |
38e1a8f5 MC |
997 | .create_session = iscsi_sw_tcp_session_create, |
998 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 999 | /* connection management */ |
38e1a8f5 MC |
1000 | .create_conn = iscsi_sw_tcp_conn_create, |
1001 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
1002 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 1003 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
1004 | .set_param = iscsi_sw_tcp_conn_set_param, |
1005 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 1006 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1007 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 1008 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 1009 | /* iscsi host params */ |
a79af8a6 | 1010 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 1011 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1012 | /* IO */ |
7ba24713 | 1013 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 1014 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 1015 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1016 | .init_task = iscsi_tcp_task_init, |
1017 | .xmit_task = iscsi_tcp_task_xmit, | |
1018 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 1019 | /* low level pdu helpers */ |
38e1a8f5 MC |
1020 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
1021 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
1022 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 1023 | /* recovery */ |
30a6c652 | 1024 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1025 | }; |
1026 | ||
38e1a8f5 | 1027 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1028 | { |
7ba24713 | 1029 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1030 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1031 | iscsi_max_lun); | |
7ba24713 AA |
1032 | return -EINVAL; |
1033 | } | |
7ba24713 | 1034 | |
38e1a8f5 MC |
1035 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1036 | &iscsi_sw_tcp_transport); | |
1037 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1038 | return -ENODEV; |
7ba24713 | 1039 | |
7b8631b5 | 1040 | return 0; |
7ba24713 AA |
1041 | } |
1042 | ||
38e1a8f5 | 1043 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1044 | { |
38e1a8f5 | 1045 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1046 | } |
1047 | ||
38e1a8f5 MC |
1048 | module_init(iscsi_sw_tcp_init); |
1049 | module_exit(iscsi_sw_tcp_exit); |