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 | ||
f1d26976 MC |
55 | static bool iscsi_recv_from_iscsi_q; |
56 | module_param_named(recv_from_iscsi_q, iscsi_recv_from_iscsi_q, bool, 0644); | |
57 | MODULE_PARM_DESC(recv_from_iscsi_q, "Set to true to read iSCSI data/headers from the iscsi_q workqueue. The default is false which will perform reads from the network softirq context."); | |
58 | ||
c93f87c7 MC |
59 | static int iscsi_sw_tcp_dbg; |
60 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
61 | S_IRUGO | S_IWUSR); | |
62 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
63 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
64 | ||
65 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
66 | do { \ | |
67 | if (iscsi_sw_tcp_dbg) \ | |
68 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
69 | "%s " dbg_fmt, \ | |
70 | __func__, ##arg); \ | |
c2332b00 FH |
71 | iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \ |
72 | &(_conn)->cls_conn->dev, \ | |
73 | "%s " dbg_fmt, __func__, ##arg);\ | |
c93f87c7 MC |
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 | ||
f1d26976 | 129 | static void iscsi_sw_tcp_recv_data(struct iscsi_conn *conn) |
7ba24713 | 130 | { |
f1d26976 MC |
131 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
132 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
133 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
134 | read_descriptor_t rd_desc; |
135 | ||
665b44ae | 136 | /* |
da32dd68 | 137 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 138 | * We set count to 1 because we want the network layer to |
da32dd68 | 139 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
140 | * handled pdus that cross buffers or pdus that still need data. |
141 | */ | |
7ba24713 | 142 | rd_desc.arg.data = conn; |
665b44ae | 143 | rd_desc.count = 1; |
7ba24713 | 144 | |
f1d26976 | 145 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
523eeac6 | 146 | |
da32dd68 OK |
147 | /* If we had to (atomically) map a highmem page, |
148 | * unmap it now. */ | |
a8ac6311 | 149 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
f1d26976 MC |
150 | |
151 | iscsi_sw_sk_state_check(sk); | |
152 | } | |
153 | ||
154 | static void iscsi_sw_tcp_recv_data_work(struct work_struct *work) | |
155 | { | |
156 | struct iscsi_conn *conn = container_of(work, struct iscsi_conn, | |
157 | recvwork); | |
158 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
159 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
160 | struct sock *sk = tcp_sw_conn->sock->sk; | |
161 | ||
162 | lock_sock(sk); | |
163 | iscsi_sw_tcp_recv_data(conn); | |
164 | release_sock(sk); | |
165 | } | |
166 | ||
167 | static void iscsi_sw_tcp_data_ready(struct sock *sk) | |
168 | { | |
169 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
170 | struct iscsi_tcp_conn *tcp_conn; | |
171 | struct iscsi_conn *conn; | |
172 | ||
173 | read_lock_bh(&sk->sk_callback_lock); | |
174 | conn = sk->sk_user_data; | |
175 | if (!conn) { | |
176 | read_unlock_bh(&sk->sk_callback_lock); | |
177 | return; | |
178 | } | |
179 | tcp_conn = conn->dd_data; | |
180 | tcp_sw_conn = tcp_conn->dd_data; | |
181 | ||
182 | if (tcp_sw_conn->queue_recv) | |
183 | iscsi_conn_queue_recv(conn); | |
184 | else | |
185 | iscsi_sw_tcp_recv_data(conn); | |
7cb001d4 | 186 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
187 | } |
188 | ||
38e1a8f5 | 189 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 190 | { |
5bb0b55a | 191 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 192 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 193 | struct iscsi_conn *conn; |
7ba24713 AA |
194 | void (*old_state_change)(struct sock *); |
195 | ||
7cb001d4 | 196 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
197 | conn = sk->sk_user_data; |
198 | if (!conn) { | |
7cb001d4 | 199 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
200 | return; |
201 | } | |
7ba24713 | 202 | |
d1af8a32 | 203 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 204 | |
5bb0b55a | 205 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
206 | tcp_sw_conn = tcp_conn->dd_data; |
207 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 | 208 | |
7cb001d4 | 209 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
210 | |
211 | old_state_change(sk); | |
212 | } | |
213 | ||
214 | /** | |
ae6b4e69 | 215 | * iscsi_sw_tcp_write_space - Called when more output buffer space is available |
7ba24713 AA |
216 | * @sk: socket space is available for |
217 | **/ | |
38e1a8f5 | 218 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 219 | { |
03adb5f9 MC |
220 | struct iscsi_conn *conn; |
221 | struct iscsi_tcp_conn *tcp_conn; | |
222 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
223 | void (*old_write_space)(struct sock *); | |
224 | ||
225 | read_lock_bh(&sk->sk_callback_lock); | |
226 | conn = sk->sk_user_data; | |
227 | if (!conn) { | |
228 | read_unlock_bh(&sk->sk_callback_lock); | |
229 | return; | |
230 | } | |
231 | ||
232 | tcp_conn = conn->dd_data; | |
233 | tcp_sw_conn = tcp_conn->dd_data; | |
234 | old_write_space = tcp_sw_conn->old_write_space; | |
235 | read_unlock_bh(&sk->sk_callback_lock); | |
236 | ||
237 | old_write_space(sk); | |
5bb0b55a | 238 | |
c93f87c7 | 239 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
4b9f8ce4 | 240 | iscsi_conn_queue_xmit(conn); |
7ba24713 AA |
241 | } |
242 | ||
38e1a8f5 | 243 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 244 | { |
5bb0b55a | 245 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
246 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
247 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
248 | |
249 | /* assign new callbacks */ | |
250 | write_lock_bh(&sk->sk_callback_lock); | |
251 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
252 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
253 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
254 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
255 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
256 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
257 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
258 | write_unlock_bh(&sk->sk_callback_lock); |
259 | } | |
260 | ||
38e1a8f5 | 261 | static void |
c484a50a | 262 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 263 | { |
c484a50a AK |
264 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
265 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 266 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
267 | |
268 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
269 | write_lock_bh(&sk->sk_callback_lock); | |
270 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
271 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
272 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
273 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
28448b80 | 274 | sk->sk_no_check_tx = 0; |
7ba24713 AA |
275 | write_unlock_bh(&sk->sk_callback_lock); |
276 | } | |
277 | ||
278 | /** | |
38e1a8f5 | 279 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 280 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
281 | * @segment: the buffer to transmnit |
282 | * | |
283 | * This function transmits as much of the buffer as | |
284 | * the network layer will accept, and returns the number of | |
285 | * bytes transmitted. | |
286 | * | |
287 | * If CRC hashing is enabled, the function will compute the | |
288 | * hash as it goes. When the entire segment has been transmitted, | |
289 | * it will retrieve the hash value and send it as well. | |
290 | */ | |
6df19a79 | 291 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
292 | struct iscsi_segment *segment) |
293 | { | |
6df19a79 | 294 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
295 | struct socket *sk = tcp_sw_conn->sock; |
296 | unsigned int copied = 0; | |
297 | int r = 0; | |
298 | ||
6df19a79 | 299 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 MC |
300 | struct scatterlist *sg; |
301 | unsigned int offset, copy; | |
302 | int flags = 0; | |
303 | ||
304 | r = 0; | |
305 | offset = segment->copied; | |
306 | copy = segment->size - offset; | |
307 | ||
308 | if (segment->total_copied + segment->size < segment->total_size) | |
f93a722f | 309 | flags |= MSG_MORE | MSG_SENDPAGE_NOTLAST; |
38e1a8f5 | 310 | |
f1d26976 MC |
311 | if (tcp_sw_conn->queue_recv) |
312 | flags |= MSG_DONTWAIT; | |
313 | ||
38e1a8f5 MC |
314 | /* Use sendpage if we can; else fall back to sendmsg */ |
315 | if (!segment->data) { | |
316 | sg = segment->sg; | |
317 | offset += segment->sg_offset + sg->offset; | |
318 | r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset, | |
319 | copy, flags); | |
320 | } else { | |
321 | struct msghdr msg = { .msg_flags = flags }; | |
322 | struct kvec iov = { | |
323 | .iov_base = segment->data + offset, | |
324 | .iov_len = copy | |
325 | }; | |
326 | ||
327 | r = kernel_sendmsg(sk, &msg, &iov, 1, copy); | |
328 | } | |
329 | ||
330 | if (r < 0) { | |
331 | iscsi_tcp_segment_unmap(segment); | |
38e1a8f5 MC |
332 | return r; |
333 | } | |
334 | copied += r; | |
335 | } | |
336 | return copied; | |
337 | } | |
338 | ||
339 | /** | |
340 | * iscsi_sw_tcp_xmit - TCP transmit | |
ccd4a430 | 341 | * @conn: iscsi connection |
a8ac6311 | 342 | **/ |
38e1a8f5 | 343 | static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn) |
7ba24713 | 344 | { |
5bb0b55a | 345 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
346 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
347 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
a8ac6311 OK |
348 | unsigned int consumed = 0; |
349 | int rc = 0; | |
7ba24713 | 350 | |
a8ac6311 | 351 | while (1) { |
6df19a79 | 352 | rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment); |
32382492 MC |
353 | /* |
354 | * We may not have been able to send data because the conn | |
25985edc | 355 | * is getting stopped. libiscsi will know so propagate err |
32382492 MC |
356 | * for it to do the right thing. |
357 | */ | |
358 | if (rc == -EAGAIN) | |
359 | return rc; | |
360 | else if (rc < 0) { | |
6f481e3c | 361 | rc = ISCSI_ERR_XMIT_FAILED; |
a8ac6311 | 362 | goto error; |
32382492 | 363 | } else if (rc == 0) |
a8ac6311 OK |
364 | break; |
365 | ||
366 | consumed += rc; | |
367 | ||
368 | if (segment->total_copied >= segment->total_size) { | |
369 | if (segment->done != NULL) { | |
370 | rc = segment->done(tcp_conn, segment); | |
6f481e3c | 371 | if (rc != 0) |
a8ac6311 OK |
372 | goto error; |
373 | } | |
374 | } | |
3219e529 MC |
375 | } |
376 | ||
c93f87c7 | 377 | ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed); |
a8ac6311 OK |
378 | |
379 | conn->txdata_octets += consumed; | |
380 | return consumed; | |
381 | ||
382 | error: | |
383 | /* Transmit error. We could initiate error recovery | |
384 | * here. */ | |
c93f87c7 | 385 | ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc); |
6f481e3c MC |
386 | iscsi_conn_failure(conn, rc); |
387 | return -EIO; | |
7ba24713 AA |
388 | } |
389 | ||
390 | /** | |
ae6b4e69 | 391 | * iscsi_sw_tcp_xmit_qlen - return the number of bytes queued for xmit |
ccd4a430 | 392 | * @conn: iscsi connection |
a8ac6311 | 393 | */ |
38e1a8f5 | 394 | static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) |
7ba24713 | 395 | { |
a8ac6311 | 396 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
397 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
398 | struct iscsi_segment *segment = &tcp_sw_conn->out.segment; | |
7ba24713 | 399 | |
a8ac6311 | 400 | return segment->total_copied - segment->total_size; |
7ba24713 AA |
401 | } |
402 | ||
38e1a8f5 | 403 | static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) |
7ba24713 | 404 | { |
e5a7efef | 405 | struct iscsi_conn *conn = task->conn; |
f1083048 | 406 | unsigned int noreclaim_flag; |
238191d6 AP |
407 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
408 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
9e45dd73 MC |
409 | int rc = 0; |
410 | ||
238191d6 AP |
411 | if (!tcp_sw_conn->sock) { |
412 | iscsi_conn_printk(KERN_ERR, conn, | |
413 | "Transport not bound to socket!\n"); | |
414 | return -EINVAL; | |
415 | } | |
416 | ||
f1083048 | 417 | noreclaim_flag = memalloc_noreclaim_save(); |
a8ac6311 | 418 | |
38e1a8f5 MC |
419 | while (iscsi_sw_tcp_xmit_qlen(conn)) { |
420 | rc = iscsi_sw_tcp_xmit(conn); | |
9e45dd73 MC |
421 | if (rc == 0) { |
422 | rc = -EAGAIN; | |
423 | break; | |
424 | } | |
a8ac6311 | 425 | if (rc < 0) |
9e45dd73 MC |
426 | break; |
427 | rc = 0; | |
3219e529 | 428 | } |
7ba24713 | 429 | |
f1083048 | 430 | memalloc_noreclaim_restore(noreclaim_flag); |
9e45dd73 | 431 | return rc; |
7ba24713 AA |
432 | } |
433 | ||
a8ac6311 OK |
434 | /* |
435 | * This is called when we're done sending the header. | |
436 | * Simply copy the data_segment to the send segment, and return. | |
437 | */ | |
38e1a8f5 MC |
438 | static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn, |
439 | struct iscsi_segment *segment) | |
7ba24713 | 440 | { |
38e1a8f5 MC |
441 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
442 | ||
443 | tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment; | |
c93f87c7 MC |
444 | ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn, |
445 | "Header done. Next segment size %u total_size %u\n", | |
446 | tcp_sw_conn->out.segment.size, | |
447 | tcp_sw_conn->out.segment.total_size); | |
a8ac6311 OK |
448 | return 0; |
449 | } | |
450 | ||
38e1a8f5 MC |
451 | static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, |
452 | size_t hdrlen) | |
a8ac6311 OK |
453 | { |
454 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 455 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
a8ac6311 | 456 | |
c93f87c7 MC |
457 | ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ? |
458 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
459 | |
460 | /* Clear the data segment - needs to be filled in by the | |
461 | * caller using iscsi_tcp_send_data_prep() */ | |
38e1a8f5 MC |
462 | memset(&tcp_sw_conn->out.data_segment, 0, |
463 | sizeof(struct iscsi_segment)); | |
a8ac6311 OK |
464 | |
465 | /* If header digest is enabled, compute the CRC and | |
466 | * place the digest into the same buffer. We make | |
135a8ad4 | 467 | * sure that both iscsi_tcp_task and mtask have |
a8ac6311 OK |
468 | * sufficient room. |
469 | */ | |
470 | if (conn->hdrdgst_en) { | |
5d6ac29b | 471 | iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen, |
a8ac6311 OK |
472 | hdr + hdrlen); |
473 | hdrlen += ISCSI_DIGEST_SIZE; | |
474 | } | |
475 | ||
476 | /* Remember header pointer for later, when we need | |
477 | * to decide whether there's a payload to go along | |
478 | * with the header. */ | |
38e1a8f5 | 479 | tcp_sw_conn->out.hdr = hdr; |
a8ac6311 | 480 | |
38e1a8f5 MC |
481 | iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen, |
482 | iscsi_sw_tcp_send_hdr_done, NULL); | |
a8ac6311 OK |
483 | } |
484 | ||
485 | /* | |
486 | * Prepare the send buffer for the payload data. | |
487 | * Padding and checksumming will all be taken care | |
488 | * of by the iscsi_segment routines. | |
489 | */ | |
490 | static int | |
38e1a8f5 MC |
491 | iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg, |
492 | unsigned int count, unsigned int offset, | |
493 | unsigned int len) | |
a8ac6311 OK |
494 | { |
495 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 496 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 497 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
498 | unsigned int hdr_spec_len; |
499 | ||
c93f87c7 MC |
500 | ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len, |
501 | conn->datadgst_en ? | |
502 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
503 | |
504 | /* Make sure the datalen matches what the caller | |
505 | said he would send. */ | |
38e1a8f5 | 506 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
507 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
508 | ||
509 | if (conn->datadgst_en) | |
5d6ac29b | 510 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 511 | |
38e1a8f5 MC |
512 | return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment, |
513 | sg, count, offset, len, | |
514 | NULL, tx_hash); | |
a8ac6311 OK |
515 | } |
516 | ||
517 | static void | |
38e1a8f5 | 518 | iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data, |
a8ac6311 OK |
519 | size_t len) |
520 | { | |
521 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 522 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5d6ac29b | 523 | struct ahash_request *tx_hash = NULL; |
a8ac6311 OK |
524 | unsigned int hdr_spec_len; |
525 | ||
c93f87c7 MC |
526 | ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ? |
527 | "digest enabled" : "digest disabled"); | |
a8ac6311 OK |
528 | |
529 | /* Make sure the datalen matches what the caller | |
530 | said he would send. */ | |
38e1a8f5 | 531 | hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength); |
a8ac6311 OK |
532 | WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len)); |
533 | ||
534 | if (conn->datadgst_en) | |
5d6ac29b | 535 | tx_hash = tcp_sw_conn->tx_hash; |
a8ac6311 | 536 | |
38e1a8f5 | 537 | iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment, |
a8ac6311 | 538 | data, len, NULL, tx_hash); |
7ba24713 AA |
539 | } |
540 | ||
38e1a8f5 MC |
541 | static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task, |
542 | unsigned int offset, unsigned int count) | |
e5a7efef MC |
543 | { |
544 | struct iscsi_conn *conn = task->conn; | |
545 | int err = 0; | |
546 | ||
38e1a8f5 | 547 | iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len); |
e5a7efef MC |
548 | |
549 | if (!count) | |
550 | return 0; | |
551 | ||
552 | if (!task->sc) | |
38e1a8f5 | 553 | iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count); |
e5a7efef | 554 | else { |
ae3d56d8 | 555 | struct scsi_data_buffer *sdb = &task->sc->sdb; |
e5a7efef | 556 | |
38e1a8f5 MC |
557 | err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl, |
558 | sdb->table.nents, offset, | |
559 | count); | |
e5a7efef MC |
560 | } |
561 | ||
562 | if (err) { | |
9a6510eb | 563 | /* got invalid offset/len */ |
e5a7efef MC |
564 | return -EIO; |
565 | } | |
566 | return 0; | |
567 | } | |
568 | ||
2ff79d52 | 569 | static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
7ba24713 | 570 | { |
135a8ad4 | 571 | struct iscsi_tcp_task *tcp_task = task->dd_data; |
7ba24713 | 572 | |
38e1a8f5 MC |
573 | task->hdr = task->dd_data + sizeof(*tcp_task); |
574 | task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE; | |
a8ac6311 | 575 | return 0; |
7ba24713 AA |
576 | } |
577 | ||
5bb0b55a | 578 | static struct iscsi_cls_conn * |
38e1a8f5 MC |
579 | iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session, |
580 | uint32_t conn_idx) | |
7ba24713 | 581 | { |
5bb0b55a MC |
582 | struct iscsi_conn *conn; |
583 | struct iscsi_cls_conn *cls_conn; | |
584 | struct iscsi_tcp_conn *tcp_conn; | |
38e1a8f5 | 585 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
5d6ac29b | 586 | struct crypto_ahash *tfm; |
7ba24713 | 587 | |
38e1a8f5 MC |
588 | cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn), |
589 | conn_idx); | |
5bb0b55a MC |
590 | if (!cls_conn) |
591 | return NULL; | |
592 | conn = cls_conn->dd_data; | |
5d91e209 | 593 | tcp_conn = conn->dd_data; |
38e1a8f5 | 594 | tcp_sw_conn = tcp_conn->dd_data; |
f1d26976 MC |
595 | INIT_WORK(&conn->recvwork, iscsi_sw_tcp_recv_data_work); |
596 | tcp_sw_conn->queue_recv = iscsi_recv_from_iscsi_q; | |
7ba24713 | 597 | |
57569c37 MC |
598 | mutex_init(&tcp_sw_conn->sock_lock); |
599 | ||
5d6ac29b HX |
600 | tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC); |
601 | if (IS_ERR(tfm)) | |
5d91e209 | 602 | goto free_conn; |
dd8c0d95 | 603 | |
5d6ac29b HX |
604 | tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL); |
605 | if (!tcp_sw_conn->tx_hash) | |
606 | goto free_tfm; | |
607 | ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL); | |
608 | ||
609 | tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL); | |
610 | if (!tcp_sw_conn->rx_hash) | |
611 | goto free_tx_hash; | |
612 | ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL); | |
613 | ||
614 | tcp_conn->rx_hash = tcp_sw_conn->rx_hash; | |
dd8c0d95 | 615 | |
5bb0b55a | 616 | return cls_conn; |
7ba24713 | 617 | |
5d6ac29b HX |
618 | free_tx_hash: |
619 | ahash_request_free(tcp_sw_conn->tx_hash); | |
620 | free_tfm: | |
621 | crypto_free_ahash(tfm); | |
5d91e209 | 622 | free_conn: |
322d739d MC |
623 | iscsi_conn_printk(KERN_ERR, conn, |
624 | "Could not create connection due to crc32c " | |
625 | "loading error. Make sure the crc32c " | |
626 | "module is built as a module or into the " | |
627 | "kernel\n"); | |
38e1a8f5 | 628 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 629 | return NULL; |
7ba24713 AA |
630 | } |
631 | ||
38e1a8f5 | 632 | static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn) |
1c83469d MC |
633 | { |
634 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 MC |
635 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
636 | struct socket *sock = tcp_sw_conn->sock; | |
1c83469d | 637 | |
57569c37 MC |
638 | /* |
639 | * The iscsi transport class will make sure we are not called in | |
640 | * parallel with start, stop, bind and destroys. However, this can be | |
641 | * called twice if userspace does a stop then a destroy. | |
642 | */ | |
22236961 | 643 | if (!sock) |
1c83469d MC |
644 | return; |
645 | ||
788b71c5 MC |
646 | /* |
647 | * Make sure we start socket shutdown now in case userspace is up | |
648 | * but delayed in releasing the socket. | |
649 | */ | |
650 | kernel_sock_shutdown(sock, SHUT_RDWR); | |
651 | ||
22236961 | 652 | sock_hold(sock->sk); |
c484a50a | 653 | iscsi_sw_tcp_conn_restore_callbacks(conn); |
22236961 | 654 | sock_put(sock->sk); |
1c83469d | 655 | |
f1d26976 MC |
656 | iscsi_suspend_rx(conn); |
657 | ||
57569c37 | 658 | mutex_lock(&tcp_sw_conn->sock_lock); |
38e1a8f5 | 659 | tcp_sw_conn->sock = NULL; |
57569c37 | 660 | mutex_unlock(&tcp_sw_conn->sock_lock); |
22236961 | 661 | sockfd_put(sock); |
1c83469d MC |
662 | } |
663 | ||
38e1a8f5 | 664 | static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn) |
7ba24713 | 665 | { |
5bb0b55a MC |
666 | struct iscsi_conn *conn = cls_conn->dd_data; |
667 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 668 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 669 | |
38e1a8f5 | 670 | iscsi_sw_tcp_release_conn(conn); |
7ba24713 | 671 | |
5d6ac29b HX |
672 | ahash_request_free(tcp_sw_conn->rx_hash); |
673 | if (tcp_sw_conn->tx_hash) { | |
674 | struct crypto_ahash *tfm; | |
675 | ||
676 | tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash); | |
677 | ahash_request_free(tcp_sw_conn->tx_hash); | |
678 | crypto_free_ahash(tfm); | |
679 | } | |
7ba24713 | 680 | |
38e1a8f5 | 681 | iscsi_tcp_conn_teardown(cls_conn); |
5bb0b55a | 682 | } |
7ba24713 | 683 | |
38e1a8f5 | 684 | static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
1c83469d MC |
685 | { |
686 | struct iscsi_conn *conn = cls_conn->dd_data; | |
913e5bf4 | 687 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 688 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
b64e77f7 | 689 | struct socket *sock = tcp_sw_conn->sock; |
913e5bf4 MC |
690 | |
691 | /* userspace may have goofed up and not bound us */ | |
b64e77f7 | 692 | if (!sock) |
913e5bf4 | 693 | return; |
1c83469d | 694 | |
8c38a295 MC |
695 | sock->sk->sk_err = EIO; |
696 | wake_up_interruptible(sk_sleep(sock->sk)); | |
b64e77f7 | 697 | |
03adb5f9 MC |
698 | /* stop xmit side */ |
699 | iscsi_suspend_tx(conn); | |
700 | ||
701 | /* stop recv side and release socket */ | |
38e1a8f5 | 702 | iscsi_sw_tcp_release_conn(conn); |
03adb5f9 MC |
703 | |
704 | iscsi_conn_stop(cls_conn, flag); | |
1c83469d MC |
705 | } |
706 | ||
5bb0b55a | 707 | static int |
38e1a8f5 MC |
708 | iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, |
709 | struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, | |
710 | int is_leading) | |
5bb0b55a MC |
711 | { |
712 | struct iscsi_conn *conn = cls_conn->dd_data; | |
713 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
38e1a8f5 | 714 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
5bb0b55a MC |
715 | struct sock *sk; |
716 | struct socket *sock; | |
717 | int err; | |
7ba24713 | 718 | |
5bb0b55a | 719 | /* lookup for existing socket */ |
264faaaa | 720 | sock = sockfd_lookup((int)transport_eph, &err); |
5bb0b55a | 721 | if (!sock) { |
322d739d MC |
722 | iscsi_conn_printk(KERN_ERR, conn, |
723 | "sockfd_lookup failed %d\n", err); | |
5bb0b55a | 724 | return -EEXIST; |
7ba24713 AA |
725 | } |
726 | ||
5bb0b55a MC |
727 | err = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
728 | if (err) | |
22236961 | 729 | goto free_socket; |
7ba24713 | 730 | |
57569c37 | 731 | mutex_lock(&tcp_sw_conn->sock_lock); |
67a61114 | 732 | /* bind iSCSI connection and socket */ |
38e1a8f5 | 733 | tcp_sw_conn->sock = sock; |
57569c37 | 734 | mutex_unlock(&tcp_sw_conn->sock_lock); |
7ba24713 | 735 | |
67a61114 MC |
736 | /* setup Socket parameters */ |
737 | sk = sock->sk; | |
4a17fd52 | 738 | sk->sk_reuse = SK_CAN_REUSE; |
67a61114 MC |
739 | sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ |
740 | sk->sk_allocation = GFP_ATOMIC; | |
9e45dd73 | 741 | sk_set_memalloc(sk); |
c0920cd3 | 742 | sock_no_linger(sk); |
7ba24713 | 743 | |
38e1a8f5 MC |
744 | iscsi_sw_tcp_conn_set_callbacks(conn); |
745 | tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; | |
67a61114 MC |
746 | /* |
747 | * set receive state machine into initial state | |
748 | */ | |
da32dd68 | 749 | iscsi_tcp_hdr_recv_prep(tcp_conn); |
7ba24713 | 750 | return 0; |
22236961 MC |
751 | |
752 | free_socket: | |
753 | sockfd_put(sock); | |
754 | return err; | |
7ba24713 AA |
755 | } |
756 | ||
38e1a8f5 MC |
757 | static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn, |
758 | enum iscsi_param param, char *buf, | |
759 | int buflen) | |
7ba24713 | 760 | { |
7b7232f3 | 761 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 762 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 763 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 764 | |
7ba24713 | 765 | switch(param) { |
7ba24713 | 766 | case ISCSI_PARAM_HDRDGST_EN: |
5c75b7fc | 767 | iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
768 | break; |
769 | case ISCSI_PARAM_DATADGST_EN: | |
5c75b7fc | 770 | iscsi_set_param(cls_conn, param, buf, buflen); |
57569c37 MC |
771 | |
772 | mutex_lock(&tcp_sw_conn->sock_lock); | |
773 | if (!tcp_sw_conn->sock) { | |
774 | mutex_unlock(&tcp_sw_conn->sock_lock); | |
775 | return -ENOTCONN; | |
776 | } | |
38e1a8f5 MC |
777 | tcp_sw_conn->sendpage = conn->datadgst_en ? |
778 | sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage; | |
57569c37 | 779 | mutex_unlock(&tcp_sw_conn->sock_lock); |
7ba24713 | 780 | break; |
7ba24713 | 781 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 782 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 783 | default: |
5c75b7fc | 784 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
785 | } |
786 | ||
787 | return 0; | |
788 | } | |
789 | ||
38e1a8f5 MC |
790 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
791 | enum iscsi_param param, char *buf) | |
7b8631b5 | 792 | { |
7b7232f3 | 793 | struct iscsi_conn *conn = cls_conn->dd_data; |
57569c37 MC |
794 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
795 | struct iscsi_tcp_conn *tcp_conn; | |
a79af8a6 | 796 | struct sockaddr_in6 addr; |
bcf3a295 | 797 | struct socket *sock; |
9b2c45d4 | 798 | int rc; |
7b8631b5 MC |
799 | |
800 | switch(param) { | |
fd7255f5 | 801 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 802 | case ISCSI_PARAM_CONN_ADDRESS: |
4bfb8ebf | 803 | case ISCSI_PARAM_LOCAL_PORT: |
659743b0 | 804 | spin_lock_bh(&conn->session->frwd_lock); |
57569c37 | 805 | if (!conn->session->leadconn) { |
659743b0 | 806 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
807 | return -ENOTCONN; |
808 | } | |
57569c37 MC |
809 | /* |
810 | * The conn has been setup and bound, so just grab a ref | |
811 | * incase a destroy runs while we are in the net layer. | |
812 | */ | |
813 | iscsi_get_conn(conn->cls_conn); | |
bcf3a295 MM |
814 | spin_unlock_bh(&conn->session->frwd_lock); |
815 | ||
57569c37 MC |
816 | tcp_conn = conn->dd_data; |
817 | tcp_sw_conn = tcp_conn->dd_data; | |
818 | ||
819 | mutex_lock(&tcp_sw_conn->sock_lock); | |
820 | sock = tcp_sw_conn->sock; | |
821 | if (!sock) { | |
822 | rc = -ENOTCONN; | |
823 | goto sock_unlock; | |
824 | } | |
825 | ||
4bfb8ebf | 826 | if (param == ISCSI_PARAM_LOCAL_PORT) |
bcf3a295 | 827 | rc = kernel_getsockname(sock, |
9b2c45d4 | 828 | (struct sockaddr *)&addr); |
4bfb8ebf | 829 | else |
bcf3a295 | 830 | rc = kernel_getpeername(sock, |
9b2c45d4 | 831 | (struct sockaddr *)&addr); |
57569c37 MC |
832 | sock_unlock: |
833 | mutex_unlock(&tcp_sw_conn->sock_lock); | |
834 | iscsi_put_conn(conn->cls_conn); | |
9b2c45d4 | 835 | if (rc < 0) |
a79af8a6 MC |
836 | return rc; |
837 | ||
838 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
839 | &addr, param, buf); | |
fd7255f5 | 840 | default: |
5c75b7fc | 841 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
842 | } |
843 | ||
a79af8a6 MC |
844 | return 0; |
845 | } | |
846 | ||
847 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
848 | enum iscsi_host_param param, char *buf) | |
849 | { | |
850 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
851 | struct iscsi_session *session = tcp_sw_host->session; | |
852 | struct iscsi_conn *conn; | |
853 | struct iscsi_tcp_conn *tcp_conn; | |
854 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
855 | struct sockaddr_in6 addr; | |
bcf3a295 | 856 | struct socket *sock; |
9b2c45d4 | 857 | int rc; |
a79af8a6 MC |
858 | |
859 | switch (param) { | |
860 | case ISCSI_HOST_PARAM_IPADDRESS: | |
eee2b5c8 MC |
861 | if (!session) |
862 | return -ENOTCONN; | |
863 | ||
659743b0 | 864 | spin_lock_bh(&session->frwd_lock); |
a79af8a6 MC |
865 | conn = session->leadconn; |
866 | if (!conn) { | |
659743b0 | 867 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
868 | return -ENOTCONN; |
869 | } | |
870 | tcp_conn = conn->dd_data; | |
a79af8a6 | 871 | tcp_sw_conn = tcp_conn->dd_data; |
57569c37 MC |
872 | /* |
873 | * The conn has been setup and bound, so just grab a ref | |
874 | * incase a destroy runs while we are in the net layer. | |
875 | */ | |
876 | iscsi_get_conn(conn->cls_conn); | |
bcf3a295 | 877 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 | 878 | |
57569c37 MC |
879 | mutex_lock(&tcp_sw_conn->sock_lock); |
880 | sock = tcp_sw_conn->sock; | |
881 | if (!sock) | |
882 | rc = -ENOTCONN; | |
883 | else | |
884 | rc = kernel_getsockname(sock, (struct sockaddr *)&addr); | |
885 | mutex_unlock(&tcp_sw_conn->sock_lock); | |
886 | iscsi_put_conn(conn->cls_conn); | |
9b2c45d4 | 887 | if (rc < 0) |
a79af8a6 MC |
888 | return rc; |
889 | ||
890 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
20054597 NC |
891 | &addr, |
892 | (enum iscsi_param)param, buf); | |
a79af8a6 MC |
893 | default: |
894 | return iscsi_host_get_param(shost, param, buf); | |
895 | } | |
896 | ||
897 | return 0; | |
fd7255f5 MC |
898 | } |
899 | ||
7ba24713 | 900 | static void |
38e1a8f5 MC |
901 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
902 | struct iscsi_stats *stats) | |
7ba24713 | 903 | { |
7b7232f3 | 904 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 905 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 906 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 907 | |
7ba24713 AA |
908 | stats->custom_length = 3; |
909 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 910 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 911 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 912 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
913 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
914 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
915 | |
916 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
917 | } |
918 | ||
5bb0b55a | 919 | static struct iscsi_cls_session * |
38e1a8f5 | 920 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 921 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 922 | { |
5bb0b55a MC |
923 | struct iscsi_cls_session *cls_session; |
924 | struct iscsi_session *session; | |
a79af8a6 | 925 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 926 | struct Scsi_Host *shost; |
25c400db | 927 | int rc; |
7ba24713 | 928 | |
06520ede MC |
929 | if (ep) { |
930 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
931 | return NULL; |
932 | } | |
933 | ||
a79af8a6 MC |
934 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
935 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 936 | if (!shost) |
5bb0b55a | 937 | return NULL; |
38e1a8f5 | 938 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 939 | shost->cmd_per_lun = qdepth; |
75613521 MC |
940 | shost->max_lun = iscsi_max_lun; |
941 | shost->max_id = 0; | |
942 | shost->max_channel = 0; | |
30e9ba9f | 943 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 944 | |
25c400db MC |
945 | rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
946 | if (rc < 0) | |
947 | goto free_host; | |
948 | shost->can_queue = rc; | |
949 | ||
a4804cd6 | 950 | if (iscsi_host_add(shost, NULL)) |
75613521 | 951 | goto free_host; |
75613521 | 952 | |
38e1a8f5 | 953 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 954 | cmds_max, 0, |
38e1a8f5 MC |
955 | sizeof(struct iscsi_tcp_task) + |
956 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 957 | initial_cmdsn, 0); |
75613521 MC |
958 | if (!cls_session) |
959 | goto remove_host; | |
960 | session = cls_session->dd_data; | |
a79af8a6 MC |
961 | tcp_sw_host = iscsi_host_priv(shost); |
962 | tcp_sw_host->session = session; | |
7ba24713 | 963 | |
38e1a8f5 | 964 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 965 | goto remove_session; |
5bb0b55a MC |
966 | return cls_session; |
967 | ||
75613521 | 968 | remove_session: |
5bb0b55a | 969 | iscsi_session_teardown(cls_session); |
75613521 | 970 | remove_host: |
31500e90 | 971 | iscsi_host_remove(shost, false); |
75613521 | 972 | free_host: |
a4804cd6 | 973 | iscsi_host_free(shost); |
5bb0b55a MC |
974 | return NULL; |
975 | } | |
976 | ||
38e1a8f5 | 977 | static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session) |
5bb0b55a | 978 | { |
75613521 | 979 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
54155ed4 NB |
980 | struct iscsi_session *session = cls_session->dd_data; |
981 | ||
982 | if (WARN_ON_ONCE(session->leadconn)) | |
983 | return; | |
75613521 | 984 | |
38e1a8f5 | 985 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
e5bd7b54 | 986 | iscsi_session_teardown(cls_session); |
75613521 | 987 | |
31500e90 | 988 | iscsi_host_remove(shost, false); |
a4804cd6 | 989 | iscsi_host_free(shost); |
7ba24713 AA |
990 | } |
991 | ||
587a1f16 | 992 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
993 | { |
994 | switch (param_type) { | |
f27fb2ef MC |
995 | case ISCSI_HOST_PARAM: |
996 | switch (param) { | |
997 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
998 | case ISCSI_HOST_PARAM_HWADDRESS: | |
999 | case ISCSI_HOST_PARAM_IPADDRESS: | |
1000 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
1001 | return S_IRUGO; | |
1002 | default: | |
1003 | return 0; | |
1004 | } | |
3128c6c7 MC |
1005 | case ISCSI_PARAM: |
1006 | switch (param) { | |
1007 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1008 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1009 | case ISCSI_PARAM_HDRDGST_EN: | |
1010 | case ISCSI_PARAM_DATADGST_EN: | |
1011 | case ISCSI_PARAM_CONN_ADDRESS: | |
1012 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 1013 | case ISCSI_PARAM_LOCAL_PORT: |
3128c6c7 MC |
1014 | case ISCSI_PARAM_EXP_STATSN: |
1015 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1016 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1017 | case ISCSI_PARAM_PING_TMO: | |
1018 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
1019 | case ISCSI_PARAM_INITIAL_R2T_EN: |
1020 | case ISCSI_PARAM_MAX_R2T: | |
1021 | case ISCSI_PARAM_IMM_DATA_EN: | |
1022 | case ISCSI_PARAM_FIRST_BURST: | |
1023 | case ISCSI_PARAM_MAX_BURST: | |
1024 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1025 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1026 | case ISCSI_PARAM_ERL: | |
1027 | case ISCSI_PARAM_TARGET_NAME: | |
1028 | case ISCSI_PARAM_TPGT: | |
1029 | case ISCSI_PARAM_USERNAME: | |
1030 | case ISCSI_PARAM_PASSWORD: | |
1031 | case ISCSI_PARAM_USERNAME_IN: | |
1032 | case ISCSI_PARAM_PASSWORD_IN: | |
1033 | case ISCSI_PARAM_FAST_ABORT: | |
1034 | case ISCSI_PARAM_ABORT_TMO: | |
1035 | case ISCSI_PARAM_LU_RESET_TMO: | |
1036 | case ISCSI_PARAM_TGT_RESET_TMO: | |
1037 | case ISCSI_PARAM_IFACE_NAME: | |
1038 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
1039 | return S_IRUGO; |
1040 | default: | |
1041 | return 0; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | return 0; | |
1046 | } | |
1047 | ||
38e1a8f5 | 1048 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 1049 | { |
89d0c804 JW |
1050 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); |
1051 | struct iscsi_session *session = tcp_sw_host->session; | |
1052 | struct iscsi_conn *conn = session->leadconn; | |
1053 | ||
1054 | if (conn->datadgst_en) | |
1cb039f3 CH |
1055 | blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, |
1056 | sdev->request_queue); | |
d1d81c01 MC |
1057 | blk_queue_dma_alignment(sdev->request_queue, 0); |
1058 | return 0; | |
1059 | } | |
1060 | ||
38e1a8f5 | 1061 | static struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 1062 | .module = THIS_MODULE, |
f4246b33 | 1063 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a | 1064 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 1065 | .change_queue_depth = scsi_change_queue_depth, |
25c400db | 1066 | .can_queue = ISCSI_TOTAL_CMDS_MAX, |
66bbe0ce | 1067 | .sg_tablesize = 4096, |
8231f0ed | 1068 | .max_sectors = 0xFFFF, |
5bb0b55a | 1069 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
b6a05c82 | 1070 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
5bb0b55a | 1071 | .eh_abort_handler = iscsi_eh_abort, |
843c0a8a | 1072 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 1073 | .eh_target_reset_handler = iscsi_eh_recover_target, |
4af14d11 | 1074 | .dma_boundary = PAGE_SIZE - 1, |
38e1a8f5 | 1075 | .slave_configure = iscsi_sw_tcp_slave_configure, |
5bb0b55a MC |
1076 | .proc_name = "iscsi_tcp", |
1077 | .this_id = -1, | |
c40ecc12 | 1078 | .track_queue_depth = 1, |
db22de3e | 1079 | .cmd_size = sizeof(struct iscsi_cmd), |
5bb0b55a MC |
1080 | }; |
1081 | ||
38e1a8f5 | 1082 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
1083 | .owner = THIS_MODULE, |
1084 | .name = "tcp", | |
1085 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
1086 | | CAP_DATADGST, | |
5bb0b55a | 1087 | /* session management */ |
38e1a8f5 MC |
1088 | .create_session = iscsi_sw_tcp_session_create, |
1089 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 1090 | /* connection management */ |
38e1a8f5 MC |
1091 | .create_conn = iscsi_sw_tcp_conn_create, |
1092 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
1093 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 1094 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
1095 | .set_param = iscsi_sw_tcp_conn_set_param, |
1096 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 1097 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1098 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 1099 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 1100 | /* iscsi host params */ |
a79af8a6 | 1101 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 1102 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1103 | /* IO */ |
7ba24713 | 1104 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 1105 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 1106 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1107 | .init_task = iscsi_tcp_task_init, |
1108 | .xmit_task = iscsi_tcp_task_xmit, | |
1109 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 1110 | /* low level pdu helpers */ |
38e1a8f5 MC |
1111 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
1112 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
1113 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 1114 | /* recovery */ |
30a6c652 | 1115 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1116 | }; |
1117 | ||
38e1a8f5 | 1118 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1119 | { |
7ba24713 | 1120 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1121 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1122 | iscsi_max_lun); | |
7ba24713 AA |
1123 | return -EINVAL; |
1124 | } | |
7ba24713 | 1125 | |
38e1a8f5 MC |
1126 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1127 | &iscsi_sw_tcp_transport); | |
1128 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1129 | return -ENODEV; |
7ba24713 | 1130 | |
7b8631b5 | 1131 | return 0; |
7ba24713 AA |
1132 | } |
1133 | ||
38e1a8f5 | 1134 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1135 | { |
38e1a8f5 | 1136 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1137 | } |
1138 | ||
38e1a8f5 MC |
1139 | module_init(iscsi_sw_tcp_init); |
1140 | module_exit(iscsi_sw_tcp_exit); |