Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7ba24713 AA |
2 | /* |
3 | * iSCSI Initiator over TCP/IP Data-Path | |
4 | * | |
5 | * Copyright (C) 2004 Dmitry Yusupov | |
6 | * Copyright (C) 2004 Alex Aizman | |
5bb0b55a MC |
7 | * Copyright (C) 2005 - 2006 Mike Christie |
8 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
7ba24713 AA |
9 | * maintained by open-iscsi@googlegroups.com |
10 | * | |
7ba24713 AA |
11 | * See the file COPYING included with this distribution for more details. |
12 | * | |
13 | * Credits: | |
14 | * Christoph Hellwig | |
15 | * FUJITA Tomonori | |
16 | * Arne Redlich | |
17 | * Zhenyu Wang | |
18 | */ | |
19 | ||
5d6ac29b | 20 | #include <crypto/hash.h> |
7ba24713 | 21 | #include <linux/types.h> |
7ba24713 | 22 | #include <linux/inet.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
f1083048 | 24 | #include <linux/sched/mm.h> |
4e7aba73 | 25 | #include <linux/file.h> |
7ba24713 | 26 | #include <linux/blkdev.h> |
7ba24713 AA |
27 | #include <linux/delay.h> |
28 | #include <linux/kfifo.h> | |
29 | #include <linux/scatterlist.h> | |
acf3368f | 30 | #include <linux/module.h> |
89d0c804 | 31 | #include <linux/backing-dev.h> |
7ba24713 AA |
32 | #include <net/tcp.h> |
33 | #include <scsi/scsi_cmnd.h> | |
d1d81c01 | 34 | #include <scsi/scsi_device.h> |
7ba24713 AA |
35 | #include <scsi/scsi_host.h> |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/scsi_transport_iscsi.h> | |
c2332b00 | 38 | #include <trace/events/iscsi.h> |
7ba24713 AA |
39 | |
40 | #include "iscsi_tcp.h" | |
41 | ||
38e1a8f5 MC |
42 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
43 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
44 | "Alex Aizman <itn780@yahoo.com>"); |
45 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
46 | MODULE_LICENSE("GPL"); | |
7ba24713 | 47 | |
38e1a8f5 MC |
48 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
49 | static struct scsi_host_template iscsi_sw_tcp_sht; | |
50 | static struct iscsi_transport iscsi_sw_tcp_transport; | |
75613521 | 51 | |
c0e4eaae | 52 | static unsigned int iscsi_max_lun = ~0; |
7ba24713 AA |
53 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
54 | ||
c93f87c7 MC |
55 | static int iscsi_sw_tcp_dbg; |
56 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
57 | S_IRUGO | S_IWUSR); | |
58 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
59 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
60 | ||
61 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
62 | do { \ | |
63 | if (iscsi_sw_tcp_dbg) \ | |
64 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
65 | "%s " dbg_fmt, \ | |
66 | __func__, ##arg); \ | |
c2332b00 FH |
67 | iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \ |
68 | &(_conn)->cls_conn->dev, \ | |
69 | "%s " dbg_fmt, __func__, ##arg);\ | |
c93f87c7 MC |
70 | } while (0); |
71 | ||
72 | ||
da32dd68 | 73 | /** |
38e1a8f5 | 74 | * iscsi_sw_tcp_recv - TCP receive in sendfile fashion |
63c62f1c MC |
75 | * @rd_desc: read descriptor |
76 | * @skb: socket buffer | |
77 | * @offset: offset in skb | |
78 | * @len: skb->len - offset | |
38e1a8f5 MC |
79 | */ |
80 | static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, | |
81 | unsigned int offset, size_t len) | |
63c62f1c MC |
82 | { |
83 | struct iscsi_conn *conn = rd_desc->arg.data; | |
84 | unsigned int consumed, total_consumed = 0; | |
85 | int status; | |
86 | ||
c93f87c7 | 87 | ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset); |
63c62f1c MC |
88 | |
89 | do { | |
90 | status = 0; | |
91 | consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status); | |
92 | offset += consumed; | |
93 | total_consumed += consumed; | |
94 | } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE); | |
95 | ||
c93f87c7 MC |
96 | ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n", |
97 | skb->len - offset, status); | |
63c62f1c | 98 | return total_consumed; |
7ba24713 AA |
99 | } |
100 | ||
523eeac6 HR |
101 | /** |
102 | * iscsi_sw_sk_state_check - check socket state | |
103 | * @sk: socket | |
104 | * | |
105 | * If the socket is in CLOSE or CLOSE_WAIT we should | |
106 | * not close the connection if there is still some | |
107 | * data pending. | |
03adb5f9 MC |
108 | * |
109 | * Must be called with sk_callback_lock. | |
523eeac6 HR |
110 | */ |
111 | static inline int iscsi_sw_sk_state_check(struct sock *sk) | |
112 | { | |
03adb5f9 | 113 | struct iscsi_conn *conn = sk->sk_user_data; |
523eeac6 | 114 | |
d1af8a32 | 115 | if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) && |
c712495e | 116 | (conn->session->state != ISCSI_STATE_LOGGING_OUT) && |
d1af8a32 MC |
117 | !atomic_read(&sk->sk_rmem_alloc)) { |
118 | ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n"); | |
119 | iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE); | |
120 | return -ECONNRESET; | |
121 | } | |
523eeac6 HR |
122 | return 0; |
123 | } | |
124 | ||
676d2369 | 125 | static void iscsi_sw_tcp_data_ready(struct sock *sk) |
7ba24713 | 126 | { |
03adb5f9 MC |
127 | struct iscsi_conn *conn; |
128 | struct iscsi_tcp_conn *tcp_conn; | |
7ba24713 AA |
129 | read_descriptor_t rd_desc; |
130 | ||
7cb001d4 | 131 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
132 | conn = sk->sk_user_data; |
133 | if (!conn) { | |
7cb001d4 | 134 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
135 | return; |
136 | } | |
137 | tcp_conn = conn->dd_data; | |
7ba24713 | 138 | |
665b44ae | 139 | /* |
da32dd68 | 140 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 141 | * We set count to 1 because we want the network layer to |
da32dd68 | 142 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
143 | * handled pdus that cross buffers or pdus that still need data. |
144 | */ | |
7ba24713 | 145 | rd_desc.arg.data = conn; |
665b44ae | 146 | rd_desc.count = 1; |
38e1a8f5 | 147 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
7ba24713 | 148 | |
d1af8a32 | 149 | iscsi_sw_sk_state_check(sk); |
523eeac6 | 150 | |
da32dd68 OK |
151 | /* If we had to (atomically) map a highmem page, |
152 | * unmap it now. */ | |
a8ac6311 | 153 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
7cb001d4 | 154 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
155 | } |
156 | ||
38e1a8f5 | 157 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 158 | { |
5bb0b55a | 159 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 160 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 161 | struct iscsi_conn *conn; |
7ba24713 AA |
162 | void (*old_state_change)(struct sock *); |
163 | ||
7cb001d4 | 164 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
165 | conn = sk->sk_user_data; |
166 | if (!conn) { | |
7cb001d4 | 167 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
168 | return; |
169 | } | |
7ba24713 | 170 | |
d1af8a32 | 171 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 172 | |
5bb0b55a | 173 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
174 | tcp_sw_conn = tcp_conn->dd_data; |
175 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 | 176 | |
7cb001d4 | 177 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
178 | |
179 | old_state_change(sk); | |
180 | } | |
181 | ||
182 | /** | |
ae6b4e69 | 183 | * iscsi_sw_tcp_write_space - Called when more output buffer space is available |
7ba24713 AA |
184 | * @sk: socket space is available for |
185 | **/ | |
38e1a8f5 | 186 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 187 | { |
03adb5f9 MC |
188 | struct iscsi_conn *conn; |
189 | struct iscsi_tcp_conn *tcp_conn; | |
190 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
191 | void (*old_write_space)(struct sock *); | |
192 | ||
193 | read_lock_bh(&sk->sk_callback_lock); | |
194 | conn = sk->sk_user_data; | |
195 | if (!conn) { | |
196 | read_unlock_bh(&sk->sk_callback_lock); | |
197 | return; | |
198 | } | |
199 | ||
200 | tcp_conn = conn->dd_data; | |
201 | tcp_sw_conn = tcp_conn->dd_data; | |
202 | old_write_space = tcp_sw_conn->old_write_space; | |
203 | read_unlock_bh(&sk->sk_callback_lock); | |
204 | ||
205 | old_write_space(sk); | |
5bb0b55a | 206 | |
c93f87c7 | 207 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
32ae763e | 208 | iscsi_conn_queue_work(conn); |
7ba24713 AA |
209 | } |
210 | ||
38e1a8f5 | 211 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 212 | { |
5bb0b55a | 213 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
214 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
215 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
216 | |
217 | /* assign new callbacks */ | |
218 | write_lock_bh(&sk->sk_callback_lock); | |
219 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
220 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
221 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
222 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
223 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
224 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
225 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
226 | write_unlock_bh(&sk->sk_callback_lock); |
227 | } | |
228 | ||
38e1a8f5 | 229 | static void |
c484a50a | 230 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 231 | { |
c484a50a AK |
232 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
233 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 234 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
235 | |
236 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
237 | write_lock_bh(&sk->sk_callback_lock); | |
238 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
239 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
240 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
241 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
28448b80 | 242 | sk->sk_no_check_tx = 0; |
7ba24713 AA |
243 | write_unlock_bh(&sk->sk_callback_lock); |
244 | } | |
245 | ||
246 | /** | |
38e1a8f5 | 247 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 248 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
249 | * @segment: the buffer to transmnit |
250 | * | |
251 | * This function transmits as much of the buffer as | |
252 | * the network layer will accept, and returns the number of | |
253 | * bytes transmitted. | |
254 | * | |
255 | * If CRC hashing is enabled, the function will compute the | |
256 | * hash as it goes. When the entire segment has been transmitted, | |
257 | * it will retrieve the hash value and send it as well. | |
258 | */ | |
6df19a79 | 259 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
260 | struct iscsi_segment *segment) |
261 | { | |
6df19a79 | 262 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
263 | struct socket *sk = tcp_sw_conn->sock; |
264 | unsigned int copied = 0; | |
265 | int r = 0; | |
266 | ||
6df19a79 | 267 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
268 | struct scatterlist *sg; |
269 | unsigned int offset, copy; | |
270 | int flags = 0; | |
271 | ||
272 | r = 0; | |
273 | offset = segment->copied; | |
274 | copy = segment->size - offset; | |
275 | ||
276 | if (segment->total_copied + segment->size < segment->total_size) | |
277 | flags |= MSG_MORE; | |
278 | ||
279 | /* Use sendpage if we can; else fall back to sendmsg */ | |
280 | if (!segment->data) { | |
281 | sg = segment->sg; | |
282 | offset += segment->sg_offset + sg->offset; | |
283 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
284 | copy, flags); | |
285 | } else { | |
286 | struct msghdr msg = { .msg_flags = flags }; | |
287 | struct kvec iov = { | |
288 | .iov_base = segment->data + offset, | |
289 | .iov_len = copy | |
290 | }; | |
291 | ||
292 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
293 | } | |
294 | ||
295 | if (r < 0) { | |
296 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
297 | return r; |
298 | } | |
299 | copied += r; | |
300 | } | |
301 | return copied; | |
302 | } | |
303 | ||
304 | /** | |
305 | * iscsi_sw_tcp_xmit - TCP transmit | |
ccd4a430 | 306 | * @conn: iscsi connection |
a8ac6311 | 307 | **/ |
38e1a8f5 | 308 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 309 | { |
5bb0b55a | 310 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
311 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
312 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
313 | unsigned int consumed = 0; |
314 | int rc = 0; | |
7ba24713 | 315 | |
a8ac6311 | 316 | while (1) { |
6df19a79 | 317 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
318 | /* |
319 | * We may not have been able to send data because the conn | |
25985edc | 320 | * is getting stopped. libiscsi will know so propagate err |
32382492 MC |
321 | * for it to do the right thing. |
322 | */ | |
323 | if (rc == -EAGAIN) | |
324 | return rc; | |
325 | else if (rc < 0) { | |
6f481e3c | 326 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 327 | goto error; |
32382492 | 328 | } else if (rc == 0) |
a8ac6311 OK |
329 | break; |
330 | ||
331 | consumed += rc; | |
332 | ||
333 | if (segment->total_copied >= segment->total_size) { | |
334 | if (segment->done != NULL) { | |
335 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 336 | if (rc != 0) |
a8ac6311 OK |
337 | goto error; |
338 | } | |
339 | } | |
3219e529 MC |
340 | } |
341 | ||
c93f87c7 | 342 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
343 | |
344 | conn->txdata_octets += consumed; | |
345 | return consumed; | |
346 | ||
347 | error: | |
348 | /* Transmit error. We could initiate error recovery | |
349 | * here. */ | |
c93f87c7 | 350 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
351 | iscsi_conn_failure(conn, rc); |
352 | return -EIO; | |
7ba24713 AA |
353 | } |
354 | ||
355 | /** | |
ae6b4e69 | 356 | * iscsi_sw_tcp_xmit_qlen - return the number of bytes queued for xmit |
ccd4a430 | 357 | * @conn: iscsi connection |
a8ac6311 | 358 | */ |
38e1a8f5 | 359 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 360 | { |
a8ac6311 | 361 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
362 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
363 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 364 | |
a8ac6311 | 365 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
366 | } |
367 | ||
38e1a8f5 | 368 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 369 | { |
e5a7efef | 370 | struct iscsi_conn *conn = task->conn; |
f1083048 | 371 | unsigned int noreclaim_flag; |
238191d6 AP |
372 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
373 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
9e45dd73 MC |
374 | int rc = 0; |
375 | ||
238191d6 AP |
376 | if (!tcp_sw_conn->sock) { |
377 | iscsi_conn_printk(KERN_ERR, conn, | |
378 | "Transport not bound to socket!\n"); | |
379 | return -EINVAL; | |
380 | } | |
381 | ||
f1083048 | 382 | noreclaim_flag = memalloc_noreclaim_save(); |
a8ac6311 | 383 | |
38e1a8f5 MC |
384 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
385 | rc = iscsi_sw_tcp_xmit(conn); | |
9e45dd73 MC |
386 | if (rc == 0) { |
387 | rc = -EAGAIN; | |
388 | break; | |
389 | } | |
a8ac6311 | 390 | if (rc < 0) |
9e45dd73 MC |
391 | break; |
392 | rc = 0; | |
3219e529 | 393 | } |
7ba24713 | 394 | |
f1083048 | 395 | memalloc_noreclaim_restore(noreclaim_flag); |
9e45dd73 | 396 | return rc; |
7ba24713 AA |
397 | } |
398 | ||
a8ac6311 OK |
399 | /* |
400 | * This is called when we're done sending the header. | |
401 | * Simply copy the data_segment to the send segment, and return. | |
402 | */ | |
38e1a8f5 MC |
403 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
404 | struct iscsi_segment *segment) | |
7ba24713 | 405 | { |
38e1a8f5 MC |
406 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
407 | ||
408 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
409 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
410 | "Header done. Next segment size %u total_size %u\n", | |
411 | tcp_sw_conn->out.segment.size, | |
412 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
413 | return 0; |
414 | } | |
415 | ||
38e1a8f5 MC |
416 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
417 | size_t hdrlen) | |
a8ac6311 OK |
418 | { |
419 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 420 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 421 | |
c93f87c7 MC |
422 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
423 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
424 | |
425 | /* Clear the data segment - needs to be filled in by the | |
426 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
427 | memset(&tcp_sw_conn->out.data_segment, 0, |
428 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
429 | |
430 | /* If header digest is enabled, compute the CRC and | |
431 | * place the digest into the same buffer. We make | |
135a8ad4 | 432 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
433 | * sufficient room. |
434 | */ | |
435 | if (conn->hdrdgst_en) { | |
5d6ac29b | 436 | iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
437 | hdr + hdrlen); |
438 | hdrlen += ISCSI_DIGEST_SIZE; | |
439 | } | |
440 | ||
441 | /* Remember header pointer for later, when we need | |
442 | * to decide whether there's a payload to go along | |
443 | * with the header. */ | |
38e1a8f5 | 444 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 445 | |
38e1a8f5 MC |
446 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
447 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
448 | } |
449 | ||
450 | /* | |
451 | * Prepare the send buffer for the payload data. | |
452 | * Padding and checksumming will all be taken care | |
453 | * of by the iscsi_segment routines. | |
454 | */ | |
455 | static int | |
38e1a8f5 MC |
456 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
457 | unsigned int count, unsigned int offset, | |
458 | unsigned int len) | |
a8ac6311 OK |
459 | { |
460 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 461 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 462 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
463 | unsigned int hdr_spec_len; |
464 | ||
c93f87c7 MC |
465 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
466 | conn->datadgst_en ? | |
467 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
468 | |
469 | /* Make sure the datalen matches what the caller | |
470 | said he would send. */ | |
38e1a8f5 | 471 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
472 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
473 | ||
474 | if (conn->datadgst_en) | |
5d6ac29b | 475 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 476 | |
38e1a8f5 MC |
477 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
478 | sg, count, offset, len, | |
479 | NULL, tx_hash); | |
a8ac6311 OK |
480 | } |
481 | ||
482 | static void | |
38e1a8f5 | 483 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
484 | size_t len) |
485 | { | |
486 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 487 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 488 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
489 | unsigned int hdr_spec_len; |
490 | ||
c93f87c7 MC |
491 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
492 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
493 | |
494 | /* Make sure the datalen matches what the caller | |
495 | said he would send. */ | |
38e1a8f5 | 496 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
497 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
498 | ||
499 | if (conn->datadgst_en) | |
5d6ac29b | 500 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 501 | |
38e1a8f5 | 502 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 503 | data, len, NULL, tx_hash); |
7ba24713 AA |
504 | } |
505 | ||
38e1a8f5 MC |
506 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
507 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
508 | { |
509 | struct iscsi_conn *conn = task->conn; | |
510 | int err = 0; | |
511 | ||
38e1a8f5 | 512 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
513 | |
514 | if (!count) | |
515 | return 0; | |
516 | ||
517 | if (!task->sc) | |
38e1a8f5 | 518 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef | 519 | else { |
ae3d56d8 | 520 | struct scsi_data_buffer *sdb = &task->sc->sdb; |
e5a7efef | 521 | |
38e1a8f5 MC |
522 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
523 | sdb->table.nents, offset, | |
524 | count); | |
e5a7efef MC |
525 | } |
526 | ||
527 | if (err) { | |
9a6510eb | 528 | /* got invalid offset/len */ |
e5a7efef MC |
529 | return -EIO; |
530 | } | |
531 | return 0; | |
532 | } | |
533 | ||
2ff79d52 | 534 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 535 | { |
135a8ad4 | 536 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 537 | |
38e1a8f5 MC |
538 | task->hdr = task->dd_data + sizeof(*tcp_task); |
539 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 540 | return 0; |
7ba24713 AA |
541 | } |
542 | ||
5bb0b55a | 543 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
544 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
545 | uint32_t conn_idx) | |
7ba24713 | 546 | { |
5bb0b55a MC |
547 | struct iscsi_conn *conn; |
548 | struct iscsi_cls_conn *cls_conn; | |
549 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 550 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
5d6ac29b | 551 | struct crypto_ahash *tfm; |
7ba24713 | 552 | |
38e1a8f5 MC |
553 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
554 | conn_idx); | |
5bb0b55a MC |
555 | if (!cls_conn) |
556 | return NULL; | |
557 | conn = cls_conn->dd_data; | |
5d91e209 | 558 | tcp_conn = conn->dd_data; |
38e1a8f5 | 559 | tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 560 | |
5d6ac29b HX |
561 | tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
562 | if (IS_ERR(tfm)) | |
5d91e209 | 563 | goto free_conn; |
dd8c0d95 | 564 | |
5d6ac29b HX |
565 | tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
566 | if (!tcp_sw_conn->tx_hash) | |
567 | goto free_tfm; | |
568 | ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL); | |
569 | ||
570 | tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); | |
571 | if (!tcp_sw_conn->rx_hash) | |
572 | goto free_tx_hash; | |
573 | ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL); | |
574 | ||
575 | tcp_conn->rx_hash = tcp_sw_conn->rx_hash; | |
dd8c0d95 | 576 | |
5bb0b55a | 577 | return cls_conn; |
7ba24713 | 578 | |
5d6ac29b HX |
579 | free_tx_hash: |
580 | ahash_request_free(tcp_sw_conn->tx_hash); | |
581 | free_tfm: | |
582 | crypto_free_ahash(tfm); | |
5d91e209 | 583 | free_conn: |
322d739d MC |
584 | iscsi_conn_printk(KERN_ERR, conn, |
585 | "Could not create connection due to crc32c " | |
586 | "loading error. Make sure the crc32c " | |
587 | "module is built as a module or into the " | |
588 | "kernel\n"); | |
38e1a8f5 | 589 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 590 | return NULL; |
7ba24713 AA |
591 | } |
592 | ||
38e1a8f5 | 593 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d | 594 | { |
22236961 | 595 | struct iscsi_session *session = conn->session; |
1c83469d | 596 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
597 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
598 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 599 | |
22236961 | 600 | if (!sock) |
1c83469d MC |
601 | return; |
602 | ||
788b71c5 MC |
603 | /* |
604 | * Make sure we start socket shutdown now in case userspace is up | |
605 | * but delayed in releasing the socket. | |
606 | */ | |
607 | kernel_sock_shutdown(sock, SHUT_RDWR); | |
608 | ||
22236961 | 609 | sock_hold(sock->sk); |
c484a50a | 610 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 611 | sock_put(sock->sk); |
1c83469d | 612 | |
659743b0 | 613 | spin_lock_bh(&session->frwd_lock); |
38e1a8f5 | 614 | tcp_sw_conn->sock = NULL; |
659743b0 | 615 | spin_unlock_bh(&session->frwd_lock); |
22236961 | 616 | sockfd_put(sock); |
1c83469d MC |
617 | } |
618 | ||
38e1a8f5 | 619 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 620 | { |
5bb0b55a MC |
621 | struct iscsi_conn *conn = cls_conn->dd_data; |
622 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 623 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 624 | |
38e1a8f5 | 625 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 626 | |
5d6ac29b HX |
627 | ahash_request_free(tcp_sw_conn->rx_hash); |
628 | if (tcp_sw_conn->tx_hash) { | |
629 | struct crypto_ahash *tfm; | |
630 | ||
631 | tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash); | |
632 | ahash_request_free(tcp_sw_conn->tx_hash); | |
633 | crypto_free_ahash(tfm); | |
634 | } | |
7ba24713 | 635 | |
38e1a8f5 | 636 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 637 | } |
7ba24713 | 638 | |
38e1a8f5 | 639 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
640 | { |
641 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 642 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 643 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 644 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
645 | |
646 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 647 | if (!sock) |
913e5bf4 | 648 | return; |
1c83469d | 649 | |
8c38a295 MC |
650 | sock->sk->sk_err = EIO; |
651 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 652 | |
03adb5f9 MC |
653 | /* stop xmit side */ |
654 | iscsi_suspend_tx(conn); | |
655 | ||
656 | /* stop recv side and release socket */ | |
38e1a8f5 | 657 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
658 | |
659 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
660 | } |
661 | ||
5bb0b55a | 662 | static int |
38e1a8f5 MC |
663 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
664 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
665 | int is_leading) | |
5bb0b55a | 666 | { |
a79af8a6 | 667 | struct iscsi_session *session = cls_session->dd_data; |
5bb0b55a MC |
668 | struct iscsi_conn *conn = cls_conn->dd_data; |
669 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 670 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
671 | struct sock *sk; |
672 | struct socket *sock; | |
673 | int err; | |
7ba24713 | 674 | |
5bb0b55a | 675 | /* lookup for existing socket */ |
264faaaa | 676 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 677 | if (!sock) { |
322d739d MC |
678 | iscsi_conn_printk(KERN_ERR, conn, |
679 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 680 | return -EEXIST; |
7ba24713 AA |
681 | } |
682 | ||
5bb0b55a MC |
683 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
684 | if (err) | |
22236961 | 685 | goto free_socket; |
7ba24713 | 686 | |
659743b0 | 687 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 688 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 689 | tcp_sw_conn->sock = sock; |
659743b0 | 690 | spin_unlock_bh(&session->frwd_lock); |
7ba24713 | 691 | |
67a61114 MC |
692 | /* setup Socket parameters */ |
693 | sk = sock->sk; | |
4a17fd52 | 694 | sk->sk_reuse = SK_CAN_REUSE; |
67a61114 MC |
695 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
696 | sk->sk_allocation = GFP_ATOMIC; | |
9e45dd73 | 697 | sk_set_memalloc(sk); |
c0920cd3 | 698 | sock_no_linger(sk); |
7ba24713 | 699 | |
38e1a8f5 MC |
700 | iscsi_sw_tcp_conn_set_callbacks(conn); |
701 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
702 | /* |
703 | * set receive state machine into initial state | |
704 | */ | |
da32dd68 | 705 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 706 | return 0; |
22236961 MC |
707 | |
708 | free_socket: | |
709 | sockfd_put(sock); | |
710 | return err; | |
7ba24713 AA |
711 | } |
712 | ||
38e1a8f5 MC |
713 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
714 | enum iscsi_param param, char *buf, | |
715 | int buflen) | |
7ba24713 | 716 | { |
7b7232f3 | 717 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 718 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 719 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 720 | |
7ba24713 | 721 | switch(param) { |
7ba24713 | 722 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 723 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
724 | break; |
725 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 726 | iscsi_set_param(cls_conn, param, buf, buflen); |
38e1a8f5 MC |
727 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
728 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
7ba24713 | 729 | break; |
7ba24713 | 730 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 731 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 732 | default: |
5c75b7fc | 733 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
734 | } |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
38e1a8f5 MC |
739 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
740 | enum iscsi_param param, char *buf) | |
7b8631b5 | 741 | { |
7b7232f3 | 742 | struct iscsi_conn *conn = cls_conn->dd_data; |
a79af8a6 MC |
743 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
744 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
745 | struct sockaddr_in6 addr; | |
bcf3a295 | 746 | struct socket *sock; |
9b2c45d4 | 747 | int rc; |
7b8631b5 MC |
748 | |
749 | switch(param) { | |
fd7255f5 | 750 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 751 | case ISCSI_PARAM_CONN_ADDRESS: |
4bfb8ebf | 752 | case ISCSI_PARAM_LOCAL_PORT: |
659743b0 | 753 | spin_lock_bh(&conn->session->frwd_lock); |
a79af8a6 | 754 | if (!tcp_sw_conn || !tcp_sw_conn->sock) { |
659743b0 | 755 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
756 | return -ENOTCONN; |
757 | } | |
bcf3a295 MM |
758 | sock = tcp_sw_conn->sock; |
759 | sock_hold(sock->sk); | |
760 | spin_unlock_bh(&conn->session->frwd_lock); | |
761 | ||
4bfb8ebf | 762 | if (param == ISCSI_PARAM_LOCAL_PORT) |
bcf3a295 | 763 | rc = kernel_getsockname(sock, |
9b2c45d4 | 764 | (struct sockaddr *)&addr); |
4bfb8ebf | 765 | else |
bcf3a295 | 766 | rc = kernel_getpeername(sock, |
9b2c45d4 | 767 | (struct sockaddr *)&addr); |
bcf3a295 | 768 | sock_put(sock->sk); |
9b2c45d4 | 769 | if (rc < 0) |
a79af8a6 MC |
770 | return rc; |
771 | ||
772 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
773 | &addr, param, buf); | |
fd7255f5 | 774 | default: |
5c75b7fc | 775 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
776 | } |
777 | ||
a79af8a6 MC |
778 | return 0; |
779 | } | |
780 | ||
781 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
782 | enum iscsi_host_param param, char *buf) | |
783 | { | |
784 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
785 | struct iscsi_session *session = tcp_sw_host->session; | |
786 | struct iscsi_conn *conn; | |
787 | struct iscsi_tcp_conn *tcp_conn; | |
788 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
789 | struct sockaddr_in6 addr; | |
bcf3a295 | 790 | struct socket *sock; |
9b2c45d4 | 791 | int rc; |
a79af8a6 MC |
792 | |
793 | switch (param) { | |
794 | case ISCSI_HOST_PARAM_IPADDRESS: | |
eee2b5c8 MC |
795 | if (!session) |
796 | return -ENOTCONN; | |
797 | ||
659743b0 | 798 | spin_lock_bh(&session->frwd_lock); |
a79af8a6 MC |
799 | conn = session->leadconn; |
800 | if (!conn) { | |
659743b0 | 801 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
802 | return -ENOTCONN; |
803 | } | |
804 | tcp_conn = conn->dd_data; | |
a79af8a6 | 805 | tcp_sw_conn = tcp_conn->dd_data; |
bcf3a295 MM |
806 | sock = tcp_sw_conn->sock; |
807 | if (!sock) { | |
659743b0 | 808 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
809 | return -ENOTCONN; |
810 | } | |
bcf3a295 MM |
811 | sock_hold(sock->sk); |
812 | spin_unlock_bh(&session->frwd_lock); | |
a79af8a6 | 813 | |
bcf3a295 | 814 | rc = kernel_getsockname(sock, |
9b2c45d4 | 815 | (struct sockaddr *)&addr); |
bcf3a295 | 816 | sock_put(sock->sk); |
9b2c45d4 | 817 | if (rc < 0) |
a79af8a6 MC |
818 | return rc; |
819 | ||
820 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
20054597 NC |
821 | &addr, |
822 | (enum iscsi_param)param, buf); | |
a79af8a6 MC |
823 | default: |
824 | return iscsi_host_get_param(shost, param, buf); | |
825 | } | |
826 | ||
827 | return 0; | |
fd7255f5 MC |
828 | } |
829 | ||
7ba24713 | 830 | static void |
38e1a8f5 MC |
831 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
832 | struct iscsi_stats *stats) | |
7ba24713 | 833 | { |
7b7232f3 | 834 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 835 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 836 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 837 | |
7ba24713 AA |
838 | stats->custom_length = 3; |
839 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 840 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 841 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 842 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
843 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
844 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
845 | |
846 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
847 | } |
848 | ||
5bb0b55a | 849 | static struct iscsi_cls_session * |
38e1a8f5 | 850 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 851 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 852 | { |
5bb0b55a MC |
853 | struct iscsi_cls_session *cls_session; |
854 | struct iscsi_session *session; | |
a79af8a6 | 855 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 856 | struct Scsi_Host *shost; |
25c400db | 857 | int rc; |
7ba24713 | 858 | |
06520ede MC |
859 | if (ep) { |
860 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
861 | return NULL; |
862 | } | |
863 | ||
a79af8a6 MC |
864 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
865 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 866 | if (!shost) |
5bb0b55a | 867 | return NULL; |
38e1a8f5 | 868 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 869 | shost->cmd_per_lun = qdepth; |
75613521 MC |
870 | shost->max_lun = iscsi_max_lun; |
871 | shost->max_id = 0; | |
872 | shost->max_channel = 0; | |
30e9ba9f | 873 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 874 | |
25c400db MC |
875 | rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
876 | if (rc < 0) | |
877 | goto free_host; | |
878 | shost->can_queue = rc; | |
879 | ||
a4804cd6 | 880 | if (iscsi_host_add(shost, NULL)) |
75613521 | 881 | goto free_host; |
75613521 | 882 | |
38e1a8f5 | 883 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 884 | cmds_max, 0, |
38e1a8f5 MC |
885 | sizeof(struct iscsi_tcp_task) + |
886 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 887 | initial_cmdsn, 0); |
75613521 MC |
888 | if (!cls_session) |
889 | goto remove_host; | |
890 | session = cls_session->dd_data; | |
a79af8a6 MC |
891 | tcp_sw_host = iscsi_host_priv(shost); |
892 | tcp_sw_host->session = session; | |
7ba24713 | 893 | |
38e1a8f5 | 894 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 895 | goto remove_session; |
5bb0b55a MC |
896 | return cls_session; |
897 | ||
75613521 | 898 | remove_session: |
5bb0b55a | 899 | iscsi_session_teardown(cls_session); |
75613521 | 900 | remove_host: |
a4804cd6 | 901 | iscsi_host_remove(shost); |
75613521 | 902 | free_host: |
a4804cd6 | 903 | iscsi_host_free(shost); |
5bb0b55a MC |
904 | return NULL; |
905 | } | |
906 | ||
38e1a8f5 | 907 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 908 | { |
75613521 | 909 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
54155ed4 NB |
910 | struct iscsi_session *session = cls_session->dd_data; |
911 | ||
912 | if (WARN_ON_ONCE(session->leadconn)) | |
913 | return; | |
75613521 | 914 | |
38e1a8f5 | 915 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 916 | iscsi_session_teardown(cls_session); |
75613521 | 917 | |
a4804cd6 MC |
918 | iscsi_host_remove(shost); |
919 | iscsi_host_free(shost); | |
7ba24713 AA |
920 | } |
921 | ||
587a1f16 | 922 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
923 | { |
924 | switch (param_type) { | |
f27fb2ef MC |
925 | case ISCSI_HOST_PARAM: |
926 | switch (param) { | |
927 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
928 | case ISCSI_HOST_PARAM_HWADDRESS: | |
929 | case ISCSI_HOST_PARAM_IPADDRESS: | |
930 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
931 | return S_IRUGO; | |
932 | default: | |
933 | return 0; | |
934 | } | |
3128c6c7 MC |
935 | case ISCSI_PARAM: |
936 | switch (param) { | |
937 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
938 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
939 | case ISCSI_PARAM_HDRDGST_EN: | |
940 | case ISCSI_PARAM_DATADGST_EN: | |
941 | case ISCSI_PARAM_CONN_ADDRESS: | |
942 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 943 | case ISCSI_PARAM_LOCAL_PORT: |
3128c6c7 MC |
944 | case ISCSI_PARAM_EXP_STATSN: |
945 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
946 | case ISCSI_PARAM_PERSISTENT_PORT: | |
947 | case ISCSI_PARAM_PING_TMO: | |
948 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
949 | case ISCSI_PARAM_INITIAL_R2T_EN: |
950 | case ISCSI_PARAM_MAX_R2T: | |
951 | case ISCSI_PARAM_IMM_DATA_EN: | |
952 | case ISCSI_PARAM_FIRST_BURST: | |
953 | case ISCSI_PARAM_MAX_BURST: | |
954 | case ISCSI_PARAM_PDU_INORDER_EN: | |
955 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
956 | case ISCSI_PARAM_ERL: | |
957 | case ISCSI_PARAM_TARGET_NAME: | |
958 | case ISCSI_PARAM_TPGT: | |
959 | case ISCSI_PARAM_USERNAME: | |
960 | case ISCSI_PARAM_PASSWORD: | |
961 | case ISCSI_PARAM_USERNAME_IN: | |
962 | case ISCSI_PARAM_PASSWORD_IN: | |
963 | case ISCSI_PARAM_FAST_ABORT: | |
964 | case ISCSI_PARAM_ABORT_TMO: | |
965 | case ISCSI_PARAM_LU_RESET_TMO: | |
966 | case ISCSI_PARAM_TGT_RESET_TMO: | |
967 | case ISCSI_PARAM_IFACE_NAME: | |
968 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
969 | return S_IRUGO; |
970 | default: | |
971 | return 0; | |
972 | } | |
973 | } | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
38e1a8f5 | 978 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 979 | { |
89d0c804 JW |
980 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); |
981 | struct iscsi_session *session = tcp_sw_host->session; | |
982 | struct iscsi_conn *conn = session->leadconn; | |
983 | ||
984 | if (conn->datadgst_en) | |
1cb039f3 CH |
985 | blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, |
986 | sdev->request_queue); | |
d1d81c01 MC |
987 | blk_queue_dma_alignment(sdev->request_queue, 0); |
988 | return 0; | |
989 | } | |
990 | ||
38e1a8f5 | 991 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 992 | .module = THIS_MODULE, |
f4246b33 | 993 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a | 994 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 995 | .change_queue_depth = scsi_change_queue_depth, |
25c400db | 996 | .can_queue = ISCSI_TOTAL_CMDS_MAX, |
66bbe0ce | 997 | .sg_tablesize = 4096, |
8231f0ed | 998 | .max_sectors = 0xFFFF, |
5bb0b55a | 999 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
b6a05c82 | 1000 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
5bb0b55a | 1001 | .eh_abort_handler = iscsi_eh_abort, |
843c0a8a | 1002 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 1003 | .eh_target_reset_handler = iscsi_eh_recover_target, |
4af14d11 | 1004 | .dma_boundary = PAGE_SIZE - 1, |
38e1a8f5 | 1005 | .slave_configure = iscsi_sw_tcp_slave_configure, |
6b5d6c44 | 1006 | .target_alloc = iscsi_target_alloc, |
5bb0b55a MC |
1007 | .proc_name = "iscsi_tcp", |
1008 | .this_id = -1, | |
c40ecc12 | 1009 | .track_queue_depth = 1, |
5bb0b55a MC |
1010 | }; |
1011 | ||
38e1a8f5 | 1012 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
1013 | .owner = THIS_MODULE, |
1014 | .name = "tcp", | |
1015 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
1016 | | CAP_DATADGST, | |
5bb0b55a | 1017 | /* session management */ |
38e1a8f5 MC |
1018 | .create_session = iscsi_sw_tcp_session_create, |
1019 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 1020 | /* connection management */ |
38e1a8f5 MC |
1021 | .create_conn = iscsi_sw_tcp_conn_create, |
1022 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
1023 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 1024 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
1025 | .set_param = iscsi_sw_tcp_conn_set_param, |
1026 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 1027 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1028 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 1029 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 1030 | /* iscsi host params */ |
a79af8a6 | 1031 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 1032 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1033 | /* IO */ |
7ba24713 | 1034 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 1035 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 1036 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1037 | .init_task = iscsi_tcp_task_init, |
1038 | .xmit_task = iscsi_tcp_task_xmit, | |
1039 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 1040 | /* low level pdu helpers */ |
38e1a8f5 MC |
1041 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
1042 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
1043 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 1044 | /* recovery */ |
30a6c652 | 1045 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1046 | }; |
1047 | ||
38e1a8f5 | 1048 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1049 | { |
7ba24713 | 1050 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1051 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1052 | iscsi_max_lun); | |
7ba24713 AA |
1053 | return -EINVAL; |
1054 | } | |
7ba24713 | 1055 | |
38e1a8f5 MC |
1056 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1057 | &iscsi_sw_tcp_transport); | |
1058 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1059 | return -ENODEV; |
7ba24713 | 1060 | |
7b8631b5 | 1061 | return 0; |
7ba24713 AA |
1062 | } |
1063 | ||
38e1a8f5 | 1064 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1065 | { |
38e1a8f5 | 1066 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1067 | } |
1068 | ||
38e1a8f5 MC |
1069 | module_init(iscsi_sw_tcp_init); |
1070 | module_exit(iscsi_sw_tcp_exit); |