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> |
40e0b090 | 39 | #include <trace/events/sock.h> |
7ba24713 AA |
40 | |
41 | #include "iscsi_tcp.h" | |
42 | ||
38e1a8f5 MC |
43 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
44 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
7ba24713 AA |
45 | "Alex Aizman <itn780@yahoo.com>"); |
46 | MODULE_DESCRIPTION("iSCSI/TCP data-path"); | |
47 | MODULE_LICENSE("GPL"); | |
7ba24713 | 48 | |
38e1a8f5 | 49 | static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport; |
80602aca | 50 | static const struct scsi_host_template iscsi_sw_tcp_sht; |
38e1a8f5 | 51 | static struct iscsi_transport iscsi_sw_tcp_transport; |
75613521 | 52 | |
c0e4eaae | 53 | static unsigned int iscsi_max_lun = ~0; |
7ba24713 AA |
54 | module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO); |
55 | ||
f1d26976 MC |
56 | static bool iscsi_recv_from_iscsi_q; |
57 | module_param_named(recv_from_iscsi_q, iscsi_recv_from_iscsi_q, bool, 0644); | |
58 | 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."); | |
59 | ||
c93f87c7 MC |
60 | static int iscsi_sw_tcp_dbg; |
61 | module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int, | |
62 | S_IRUGO | S_IWUSR); | |
63 | MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module " | |
64 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
65 | ||
66 | #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \ | |
67 | do { \ | |
68 | if (iscsi_sw_tcp_dbg) \ | |
69 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
70 | "%s " dbg_fmt, \ | |
71 | __func__, ##arg); \ | |
c2332b00 FH |
72 | iscsi_dbg_trace(trace_iscsi_dbg_sw_tcp, \ |
73 | &(_conn)->cls_conn->dev, \ | |
74 | "%s " dbg_fmt, __func__, ##arg);\ | |
c93f87c7 MC |
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 | ||
f1d26976 | 130 | static void iscsi_sw_tcp_recv_data(struct iscsi_conn *conn) |
7ba24713 | 131 | { |
f1d26976 MC |
132 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
133 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
134 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
135 | read_descriptor_t rd_desc; |
136 | ||
665b44ae | 137 | /* |
da32dd68 | 138 | * Use rd_desc to pass 'conn' to iscsi_tcp_recv. |
665b44ae | 139 | * We set count to 1 because we want the network layer to |
da32dd68 | 140 | * hand us all the skbs that are available. iscsi_tcp_recv |
665b44ae MC |
141 | * handled pdus that cross buffers or pdus that still need data. |
142 | */ | |
7ba24713 | 143 | rd_desc.arg.data = conn; |
665b44ae | 144 | rd_desc.count = 1; |
7ba24713 | 145 | |
f1d26976 | 146 | tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv); |
523eeac6 | 147 | |
da32dd68 OK |
148 | /* If we had to (atomically) map a highmem page, |
149 | * unmap it now. */ | |
a8ac6311 | 150 | iscsi_tcp_segment_unmap(&tcp_conn->in.segment); |
f1d26976 MC |
151 | |
152 | iscsi_sw_sk_state_check(sk); | |
153 | } | |
154 | ||
155 | static void iscsi_sw_tcp_recv_data_work(struct work_struct *work) | |
156 | { | |
157 | struct iscsi_conn *conn = container_of(work, struct iscsi_conn, | |
158 | recvwork); | |
159 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; | |
160 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
161 | struct sock *sk = tcp_sw_conn->sock->sk; | |
162 | ||
163 | lock_sock(sk); | |
164 | iscsi_sw_tcp_recv_data(conn); | |
165 | release_sock(sk); | |
166 | } | |
167 | ||
168 | static void iscsi_sw_tcp_data_ready(struct sock *sk) | |
169 | { | |
170 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
171 | struct iscsi_tcp_conn *tcp_conn; | |
172 | struct iscsi_conn *conn; | |
173 | ||
40e0b090 PY |
174 | trace_sk_data_ready(sk); |
175 | ||
f1d26976 MC |
176 | read_lock_bh(&sk->sk_callback_lock); |
177 | conn = sk->sk_user_data; | |
178 | if (!conn) { | |
179 | read_unlock_bh(&sk->sk_callback_lock); | |
180 | return; | |
181 | } | |
182 | tcp_conn = conn->dd_data; | |
183 | tcp_sw_conn = tcp_conn->dd_data; | |
184 | ||
185 | if (tcp_sw_conn->queue_recv) | |
186 | iscsi_conn_queue_recv(conn); | |
187 | else | |
188 | iscsi_sw_tcp_recv_data(conn); | |
7cb001d4 | 189 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
190 | } |
191 | ||
38e1a8f5 | 192 | static void iscsi_sw_tcp_state_change(struct sock *sk) |
7ba24713 | 193 | { |
5bb0b55a | 194 | struct iscsi_tcp_conn *tcp_conn; |
38e1a8f5 | 195 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
7ba24713 | 196 | struct iscsi_conn *conn; |
7ba24713 AA |
197 | void (*old_state_change)(struct sock *); |
198 | ||
7cb001d4 | 199 | read_lock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
200 | conn = sk->sk_user_data; |
201 | if (!conn) { | |
7cb001d4 | 202 | read_unlock_bh(&sk->sk_callback_lock); |
03adb5f9 MC |
203 | return; |
204 | } | |
7ba24713 | 205 | |
d1af8a32 | 206 | iscsi_sw_sk_state_check(sk); |
7ba24713 | 207 | |
5bb0b55a | 208 | tcp_conn = conn->dd_data; |
38e1a8f5 MC |
209 | tcp_sw_conn = tcp_conn->dd_data; |
210 | old_state_change = tcp_sw_conn->old_state_change; | |
7ba24713 | 211 | |
7cb001d4 | 212 | read_unlock_bh(&sk->sk_callback_lock); |
7ba24713 AA |
213 | |
214 | old_state_change(sk); | |
215 | } | |
216 | ||
217 | /** | |
ae6b4e69 | 218 | * iscsi_sw_tcp_write_space - Called when more output buffer space is available |
7ba24713 AA |
219 | * @sk: socket space is available for |
220 | **/ | |
38e1a8f5 | 221 | static void iscsi_sw_tcp_write_space(struct sock *sk) |
7ba24713 | 222 | { |
03adb5f9 MC |
223 | struct iscsi_conn *conn; |
224 | struct iscsi_tcp_conn *tcp_conn; | |
225 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
226 | void (*old_write_space)(struct sock *); | |
227 | ||
228 | read_lock_bh(&sk->sk_callback_lock); | |
229 | conn = sk->sk_user_data; | |
230 | if (!conn) { | |
231 | read_unlock_bh(&sk->sk_callback_lock); | |
232 | return; | |
233 | } | |
234 | ||
235 | tcp_conn = conn->dd_data; | |
236 | tcp_sw_conn = tcp_conn->dd_data; | |
237 | old_write_space = tcp_sw_conn->old_write_space; | |
238 | read_unlock_bh(&sk->sk_callback_lock); | |
239 | ||
240 | old_write_space(sk); | |
5bb0b55a | 241 | |
c93f87c7 | 242 | ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n"); |
4b9f8ce4 | 243 | iscsi_conn_queue_xmit(conn); |
7ba24713 AA |
244 | } |
245 | ||
38e1a8f5 | 246 | static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn) |
7ba24713 | 247 | { |
5bb0b55a | 248 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 MC |
249 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
250 | struct sock *sk = tcp_sw_conn->sock->sk; | |
7ba24713 AA |
251 | |
252 | /* assign new callbacks */ | |
253 | write_lock_bh(&sk->sk_callback_lock); | |
254 | sk->sk_user_data = conn; | |
38e1a8f5 MC |
255 | tcp_sw_conn->old_data_ready = sk->sk_data_ready; |
256 | tcp_sw_conn->old_state_change = sk->sk_state_change; | |
257 | tcp_sw_conn->old_write_space = sk->sk_write_space; | |
258 | sk->sk_data_ready = iscsi_sw_tcp_data_ready; | |
259 | sk->sk_state_change = iscsi_sw_tcp_state_change; | |
260 | sk->sk_write_space = iscsi_sw_tcp_write_space; | |
7ba24713 AA |
261 | write_unlock_bh(&sk->sk_callback_lock); |
262 | } | |
263 | ||
38e1a8f5 | 264 | static void |
c484a50a | 265 | iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn) |
7ba24713 | 266 | { |
c484a50a AK |
267 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
268 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; | |
38e1a8f5 | 269 | struct sock *sk = tcp_sw_conn->sock->sk; |
7ba24713 AA |
270 | |
271 | /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */ | |
272 | write_lock_bh(&sk->sk_callback_lock); | |
273 | sk->sk_user_data = NULL; | |
38e1a8f5 MC |
274 | sk->sk_data_ready = tcp_sw_conn->old_data_ready; |
275 | sk->sk_state_change = tcp_sw_conn->old_state_change; | |
276 | sk->sk_write_space = tcp_sw_conn->old_write_space; | |
28448b80 | 277 | sk->sk_no_check_tx = 0; |
7ba24713 AA |
278 | write_unlock_bh(&sk->sk_callback_lock); |
279 | } | |
280 | ||
281 | /** | |
38e1a8f5 | 282 | * iscsi_sw_tcp_xmit_segment - transmit segment |
6df19a79 | 283 | * @tcp_conn: the iSCSI TCP connection |
38e1a8f5 MC |
284 | * @segment: the buffer to transmnit |
285 | * | |
286 | * This function transmits as much of the buffer as | |
287 | * the network layer will accept, and returns the number of | |
288 | * bytes transmitted. | |
289 | * | |
290 | * If CRC hashing is enabled, the function will compute the | |
291 | * hash as it goes. When the entire segment has been transmitted, | |
292 | * it will retrieve the hash value and send it as well. | |
293 | */ | |
6df19a79 | 294 | static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn, |
38e1a8f5 MC |
295 | struct iscsi_segment *segment) |
296 | { | |
6df19a79 | 297 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
38e1a8f5 MC |
298 | struct socket *sk = tcp_sw_conn->sock; |
299 | unsigned int copied = 0; | |
300 | int r = 0; | |
301 | ||
6df19a79 | 302 | while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) { |
38e1a8f5 | 303 | struct scatterlist *sg; |
fa8df343 DH |
304 | struct msghdr msg = {}; |
305 | struct bio_vec bv; | |
38e1a8f5 | 306 | unsigned int offset, copy; |
38e1a8f5 MC |
307 | |
308 | r = 0; | |
309 | offset = segment->copied; | |
310 | copy = segment->size - offset; | |
311 | ||
312 | if (segment->total_copied + segment->size < segment->total_size) | |
fa8df343 | 313 | msg.msg_flags |= MSG_MORE; |
38e1a8f5 | 314 | |
f1d26976 | 315 | if (tcp_sw_conn->queue_recv) |
fa8df343 | 316 | msg.msg_flags |= MSG_DONTWAIT; |
f1d26976 | 317 | |
38e1a8f5 | 318 | if (!segment->data) { |
fa8df343 DH |
319 | if (!tcp_conn->iscsi_conn->datadgst_en) |
320 | msg.msg_flags |= MSG_SPLICE_PAGES; | |
38e1a8f5 MC |
321 | sg = segment->sg; |
322 | offset += segment->sg_offset + sg->offset; | |
fa8df343 | 323 | bvec_set_page(&bv, sg_page(sg), copy, offset); |
38e1a8f5 | 324 | } else { |
fa8df343 | 325 | bvec_set_virt(&bv, segment->data + offset, copy); |
38e1a8f5 | 326 | } |
fa8df343 | 327 | iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bv, 1, copy); |
38e1a8f5 | 328 | |
fa8df343 | 329 | r = sock_sendmsg(sk, &msg); |
38e1a8f5 MC |
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; | |
98123866 | 741 | sk->sk_use_task_frag = false; |
9e45dd73 | 742 | sk_set_memalloc(sk); |
c0920cd3 | 743 | sock_no_linger(sk); |
7ba24713 | 744 | |
38e1a8f5 | 745 | iscsi_sw_tcp_conn_set_callbacks(conn); |
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: | |
57569c37 MC |
770 | mutex_lock(&tcp_sw_conn->sock_lock); |
771 | if (!tcp_sw_conn->sock) { | |
772 | mutex_unlock(&tcp_sw_conn->sock_lock); | |
773 | return -ENOTCONN; | |
774 | } | |
48b19b79 | 775 | iscsi_set_param(cls_conn, param, buf, buflen); |
57569c37 | 776 | mutex_unlock(&tcp_sw_conn->sock_lock); |
7ba24713 | 777 | break; |
7ba24713 | 778 | case ISCSI_PARAM_MAX_R2T: |
1304be5f | 779 | return iscsi_tcp_set_max_r2t(conn, buf); |
7ba24713 | 780 | default: |
5c75b7fc | 781 | return iscsi_set_param(cls_conn, param, buf, buflen); |
7ba24713 AA |
782 | } |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
38e1a8f5 MC |
787 | static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn, |
788 | enum iscsi_param param, char *buf) | |
7b8631b5 | 789 | { |
7b7232f3 | 790 | struct iscsi_conn *conn = cls_conn->dd_data; |
57569c37 MC |
791 | struct iscsi_sw_tcp_conn *tcp_sw_conn; |
792 | struct iscsi_tcp_conn *tcp_conn; | |
a79af8a6 | 793 | struct sockaddr_in6 addr; |
bcf3a295 | 794 | struct socket *sock; |
9b2c45d4 | 795 | int rc; |
7b8631b5 MC |
796 | |
797 | switch(param) { | |
fd7255f5 | 798 | case ISCSI_PARAM_CONN_PORT: |
fd7255f5 | 799 | case ISCSI_PARAM_CONN_ADDRESS: |
4bfb8ebf | 800 | case ISCSI_PARAM_LOCAL_PORT: |
659743b0 | 801 | spin_lock_bh(&conn->session->frwd_lock); |
57569c37 | 802 | if (!conn->session->leadconn) { |
659743b0 | 803 | spin_unlock_bh(&conn->session->frwd_lock); |
a79af8a6 MC |
804 | return -ENOTCONN; |
805 | } | |
57569c37 MC |
806 | /* |
807 | * The conn has been setup and bound, so just grab a ref | |
808 | * incase a destroy runs while we are in the net layer. | |
809 | */ | |
810 | iscsi_get_conn(conn->cls_conn); | |
bcf3a295 MM |
811 | spin_unlock_bh(&conn->session->frwd_lock); |
812 | ||
57569c37 MC |
813 | tcp_conn = conn->dd_data; |
814 | tcp_sw_conn = tcp_conn->dd_data; | |
815 | ||
816 | mutex_lock(&tcp_sw_conn->sock_lock); | |
817 | sock = tcp_sw_conn->sock; | |
818 | if (!sock) { | |
819 | rc = -ENOTCONN; | |
820 | goto sock_unlock; | |
821 | } | |
822 | ||
4bfb8ebf | 823 | if (param == ISCSI_PARAM_LOCAL_PORT) |
bcf3a295 | 824 | rc = kernel_getsockname(sock, |
9b2c45d4 | 825 | (struct sockaddr *)&addr); |
4bfb8ebf | 826 | else |
bcf3a295 | 827 | rc = kernel_getpeername(sock, |
9b2c45d4 | 828 | (struct sockaddr *)&addr); |
57569c37 MC |
829 | sock_unlock: |
830 | mutex_unlock(&tcp_sw_conn->sock_lock); | |
831 | iscsi_put_conn(conn->cls_conn); | |
9b2c45d4 | 832 | if (rc < 0) |
a79af8a6 MC |
833 | return rc; |
834 | ||
835 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
836 | &addr, param, buf); | |
fd7255f5 | 837 | default: |
5c75b7fc | 838 | return iscsi_conn_get_param(cls_conn, param, buf); |
fd7255f5 MC |
839 | } |
840 | ||
a79af8a6 MC |
841 | return 0; |
842 | } | |
843 | ||
844 | static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost, | |
845 | enum iscsi_host_param param, char *buf) | |
846 | { | |
847 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost); | |
f484a794 | 848 | struct iscsi_session *session; |
a79af8a6 MC |
849 | struct iscsi_conn *conn; |
850 | struct iscsi_tcp_conn *tcp_conn; | |
851 | struct iscsi_sw_tcp_conn *tcp_sw_conn; | |
852 | struct sockaddr_in6 addr; | |
bcf3a295 | 853 | struct socket *sock; |
9b2c45d4 | 854 | int rc; |
a79af8a6 MC |
855 | |
856 | switch (param) { | |
857 | case ISCSI_HOST_PARAM_IPADDRESS: | |
f484a794 | 858 | session = tcp_sw_host->session; |
eee2b5c8 MC |
859 | if (!session) |
860 | return -ENOTCONN; | |
861 | ||
659743b0 | 862 | spin_lock_bh(&session->frwd_lock); |
a79af8a6 MC |
863 | conn = session->leadconn; |
864 | if (!conn) { | |
659743b0 | 865 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 MC |
866 | return -ENOTCONN; |
867 | } | |
868 | tcp_conn = conn->dd_data; | |
a79af8a6 | 869 | tcp_sw_conn = tcp_conn->dd_data; |
57569c37 MC |
870 | /* |
871 | * The conn has been setup and bound, so just grab a ref | |
872 | * incase a destroy runs while we are in the net layer. | |
873 | */ | |
874 | iscsi_get_conn(conn->cls_conn); | |
bcf3a295 | 875 | spin_unlock_bh(&session->frwd_lock); |
a79af8a6 | 876 | |
57569c37 MC |
877 | mutex_lock(&tcp_sw_conn->sock_lock); |
878 | sock = tcp_sw_conn->sock; | |
879 | if (!sock) | |
880 | rc = -ENOTCONN; | |
881 | else | |
882 | rc = kernel_getsockname(sock, (struct sockaddr *)&addr); | |
883 | mutex_unlock(&tcp_sw_conn->sock_lock); | |
884 | iscsi_put_conn(conn->cls_conn); | |
9b2c45d4 | 885 | if (rc < 0) |
a79af8a6 MC |
886 | return rc; |
887 | ||
888 | return iscsi_conn_get_addr_param((struct sockaddr_storage *) | |
20054597 NC |
889 | &addr, |
890 | (enum iscsi_param)param, buf); | |
a79af8a6 MC |
891 | default: |
892 | return iscsi_host_get_param(shost, param, buf); | |
893 | } | |
894 | ||
895 | return 0; | |
fd7255f5 MC |
896 | } |
897 | ||
7ba24713 | 898 | static void |
38e1a8f5 MC |
899 | iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn, |
900 | struct iscsi_stats *stats) | |
7ba24713 | 901 | { |
7b7232f3 | 902 | struct iscsi_conn *conn = cls_conn->dd_data; |
5bb0b55a | 903 | struct iscsi_tcp_conn *tcp_conn = conn->dd_data; |
38e1a8f5 | 904 | struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data; |
7ba24713 | 905 | |
7ba24713 AA |
906 | stats->custom_length = 3; |
907 | strcpy(stats->custom[0].desc, "tx_sendpage_failures"); | |
38e1a8f5 | 908 | stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt; |
7ba24713 | 909 | strcpy(stats->custom[1].desc, "rx_discontiguous_hdr"); |
38e1a8f5 | 910 | stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt; |
7ba24713 AA |
911 | strcpy(stats->custom[2].desc, "eh_abort_cnt"); |
912 | stats->custom[2].value = conn->eh_abort_cnt; | |
38e1a8f5 MC |
913 | |
914 | iscsi_tcp_conn_get_stats(cls_conn, stats); | |
7ba24713 AA |
915 | } |
916 | ||
5bb0b55a | 917 | static struct iscsi_cls_session * |
38e1a8f5 | 918 | iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max, |
5e7facb7 | 919 | uint16_t qdepth, uint32_t initial_cmdsn) |
7ba24713 | 920 | { |
5bb0b55a MC |
921 | struct iscsi_cls_session *cls_session; |
922 | struct iscsi_session *session; | |
a79af8a6 | 923 | struct iscsi_sw_tcp_host *tcp_sw_host; |
06520ede | 924 | struct Scsi_Host *shost; |
25c400db | 925 | int rc; |
7ba24713 | 926 | |
06520ede MC |
927 | if (ep) { |
928 | printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep); | |
75613521 MC |
929 | return NULL; |
930 | } | |
931 | ||
a79af8a6 MC |
932 | shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, |
933 | sizeof(struct iscsi_sw_tcp_host), 1); | |
75613521 | 934 | if (!shost) |
5bb0b55a | 935 | return NULL; |
38e1a8f5 | 936 | shost->transportt = iscsi_sw_tcp_scsi_transport; |
4d108350 | 937 | shost->cmd_per_lun = qdepth; |
75613521 MC |
938 | shost->max_lun = iscsi_max_lun; |
939 | shost->max_id = 0; | |
940 | shost->max_channel = 0; | |
30e9ba9f | 941 | shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
75613521 | 942 | |
25c400db MC |
943 | rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
944 | if (rc < 0) | |
945 | goto free_host; | |
946 | shost->can_queue = rc; | |
947 | ||
a4804cd6 | 948 | if (iscsi_host_add(shost, NULL)) |
75613521 | 949 | goto free_host; |
75613521 | 950 | |
38e1a8f5 | 951 | cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost, |
b8b9e1b8 | 952 | cmds_max, 0, |
38e1a8f5 MC |
953 | sizeof(struct iscsi_tcp_task) + |
954 | sizeof(struct iscsi_sw_tcp_hdrbuf), | |
7970634b | 955 | initial_cmdsn, 0); |
75613521 MC |
956 | if (!cls_session) |
957 | goto remove_host; | |
958 | session = cls_session->dd_data; | |
7ba24713 | 959 | |
38e1a8f5 | 960 | if (iscsi_tcp_r2tpool_alloc(session)) |
75613521 | 961 | goto remove_session; |
f484a794 MC |
962 | |
963 | /* We are now fully setup so expose the session to sysfs. */ | |
964 | tcp_sw_host = iscsi_host_priv(shost); | |
965 | tcp_sw_host->session = 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 | |
6f1d64b1 MC |
985 | iscsi_session_remove(cls_session); |
986 | /* | |
987 | * Our get_host_param needs to access the session, so remove the | |
988 | * host from sysfs before freeing the session to make sure userspace | |
989 | * is no longer accessing the callout. | |
990 | */ | |
991 | iscsi_host_remove(shost, false); | |
992 | ||
38e1a8f5 | 993 | iscsi_tcp_r2tpool_free(cls_session->dd_data); |
75613521 | 994 | |
6f1d64b1 | 995 | iscsi_session_free(cls_session); |
a4804cd6 | 996 | iscsi_host_free(shost); |
7ba24713 AA |
997 | } |
998 | ||
587a1f16 | 999 | static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param) |
3128c6c7 MC |
1000 | { |
1001 | switch (param_type) { | |
f27fb2ef MC |
1002 | case ISCSI_HOST_PARAM: |
1003 | switch (param) { | |
1004 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
1005 | case ISCSI_HOST_PARAM_HWADDRESS: | |
1006 | case ISCSI_HOST_PARAM_IPADDRESS: | |
1007 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
1008 | return S_IRUGO; | |
1009 | default: | |
1010 | return 0; | |
1011 | } | |
3128c6c7 MC |
1012 | case ISCSI_PARAM: |
1013 | switch (param) { | |
1014 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1015 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1016 | case ISCSI_PARAM_HDRDGST_EN: | |
1017 | case ISCSI_PARAM_DATADGST_EN: | |
1018 | case ISCSI_PARAM_CONN_ADDRESS: | |
1019 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 1020 | case ISCSI_PARAM_LOCAL_PORT: |
3128c6c7 MC |
1021 | case ISCSI_PARAM_EXP_STATSN: |
1022 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1023 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1024 | case ISCSI_PARAM_PING_TMO: | |
1025 | case ISCSI_PARAM_RECV_TMO: | |
1d063c17 MC |
1026 | case ISCSI_PARAM_INITIAL_R2T_EN: |
1027 | case ISCSI_PARAM_MAX_R2T: | |
1028 | case ISCSI_PARAM_IMM_DATA_EN: | |
1029 | case ISCSI_PARAM_FIRST_BURST: | |
1030 | case ISCSI_PARAM_MAX_BURST: | |
1031 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1032 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1033 | case ISCSI_PARAM_ERL: | |
1034 | case ISCSI_PARAM_TARGET_NAME: | |
1035 | case ISCSI_PARAM_TPGT: | |
1036 | case ISCSI_PARAM_USERNAME: | |
1037 | case ISCSI_PARAM_PASSWORD: | |
1038 | case ISCSI_PARAM_USERNAME_IN: | |
1039 | case ISCSI_PARAM_PASSWORD_IN: | |
1040 | case ISCSI_PARAM_FAST_ABORT: | |
1041 | case ISCSI_PARAM_ABORT_TMO: | |
1042 | case ISCSI_PARAM_LU_RESET_TMO: | |
1043 | case ISCSI_PARAM_TGT_RESET_TMO: | |
1044 | case ISCSI_PARAM_IFACE_NAME: | |
1045 | case ISCSI_PARAM_INITIATOR_NAME: | |
3128c6c7 MC |
1046 | return S_IRUGO; |
1047 | default: | |
1048 | return 0; | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
38e1a8f5 | 1055 | static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev) |
d1d81c01 | 1056 | { |
89d0c804 JW |
1057 | struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host); |
1058 | struct iscsi_session *session = tcp_sw_host->session; | |
1059 | struct iscsi_conn *conn = session->leadconn; | |
1060 | ||
1061 | if (conn->datadgst_en) | |
1cb039f3 CH |
1062 | blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, |
1063 | sdev->request_queue); | |
d1d81c01 MC |
1064 | blk_queue_dma_alignment(sdev->request_queue, 0); |
1065 | return 0; | |
1066 | } | |
1067 | ||
80602aca | 1068 | static const struct scsi_host_template iscsi_sw_tcp_sht = { |
7974392c | 1069 | .module = THIS_MODULE, |
f4246b33 | 1070 | .name = "iSCSI Initiator over TCP/IP", |
5bb0b55a | 1071 | .queuecommand = iscsi_queuecommand, |
db5ed4df | 1072 | .change_queue_depth = scsi_change_queue_depth, |
25c400db | 1073 | .can_queue = ISCSI_TOTAL_CMDS_MAX, |
66bbe0ce | 1074 | .sg_tablesize = 4096, |
8231f0ed | 1075 | .max_sectors = 0xFFFF, |
5bb0b55a | 1076 | .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, |
b6a05c82 | 1077 | .eh_timed_out = iscsi_eh_cmd_timed_out, |
5bb0b55a | 1078 | .eh_abort_handler = iscsi_eh_abort, |
843c0a8a | 1079 | .eh_device_reset_handler= iscsi_eh_device_reset, |
309ce156 | 1080 | .eh_target_reset_handler = iscsi_eh_recover_target, |
4af14d11 | 1081 | .dma_boundary = PAGE_SIZE - 1, |
38e1a8f5 | 1082 | .slave_configure = iscsi_sw_tcp_slave_configure, |
5bb0b55a MC |
1083 | .proc_name = "iscsi_tcp", |
1084 | .this_id = -1, | |
c40ecc12 | 1085 | .track_queue_depth = 1, |
db22de3e | 1086 | .cmd_size = sizeof(struct iscsi_cmd), |
5bb0b55a MC |
1087 | }; |
1088 | ||
38e1a8f5 | 1089 | static struct iscsi_transport iscsi_sw_tcp_transport = { |
7ba24713 AA |
1090 | .owner = THIS_MODULE, |
1091 | .name = "tcp", | |
1092 | .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST | |
1093 | | CAP_DATADGST, | |
5bb0b55a | 1094 | /* session management */ |
38e1a8f5 MC |
1095 | .create_session = iscsi_sw_tcp_session_create, |
1096 | .destroy_session = iscsi_sw_tcp_session_destroy, | |
5bb0b55a | 1097 | /* connection management */ |
38e1a8f5 MC |
1098 | .create_conn = iscsi_sw_tcp_conn_create, |
1099 | .bind_conn = iscsi_sw_tcp_conn_bind, | |
1100 | .destroy_conn = iscsi_sw_tcp_conn_destroy, | |
3128c6c7 | 1101 | .attr_is_visible = iscsi_sw_tcp_attr_is_visible, |
38e1a8f5 MC |
1102 | .set_param = iscsi_sw_tcp_conn_set_param, |
1103 | .get_conn_param = iscsi_sw_tcp_conn_get_param, | |
7b8631b5 | 1104 | .get_session_param = iscsi_session_get_param, |
7ba24713 | 1105 | .start_conn = iscsi_conn_start, |
38e1a8f5 | 1106 | .stop_conn = iscsi_sw_tcp_conn_stop, |
0801c242 | 1107 | /* iscsi host params */ |
a79af8a6 | 1108 | .get_host_param = iscsi_sw_tcp_host_get_param, |
0801c242 | 1109 | .set_host_param = iscsi_host_set_param, |
5bb0b55a | 1110 | /* IO */ |
7ba24713 | 1111 | .send_pdu = iscsi_conn_send_pdu, |
38e1a8f5 | 1112 | .get_stats = iscsi_sw_tcp_conn_get_stats, |
e5a7efef | 1113 | /* iscsi task/cmd helpers */ |
fbc514b4 MC |
1114 | .init_task = iscsi_tcp_task_init, |
1115 | .xmit_task = iscsi_tcp_task_xmit, | |
1116 | .cleanup_task = iscsi_tcp_cleanup_task, | |
e5a7efef | 1117 | /* low level pdu helpers */ |
38e1a8f5 MC |
1118 | .xmit_pdu = iscsi_sw_tcp_pdu_xmit, |
1119 | .init_pdu = iscsi_sw_tcp_pdu_init, | |
1120 | .alloc_pdu = iscsi_sw_tcp_pdu_alloc, | |
5bb0b55a | 1121 | /* recovery */ |
30a6c652 | 1122 | .session_recovery_timedout = iscsi_session_recovery_timedout, |
7ba24713 AA |
1123 | }; |
1124 | ||
38e1a8f5 | 1125 | static int __init iscsi_sw_tcp_init(void) |
7ba24713 | 1126 | { |
7ba24713 | 1127 | if (iscsi_max_lun < 1) { |
be2df72e OG |
1128 | printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n", |
1129 | iscsi_max_lun); | |
7ba24713 AA |
1130 | return -EINVAL; |
1131 | } | |
7ba24713 | 1132 | |
38e1a8f5 MC |
1133 | iscsi_sw_tcp_scsi_transport = iscsi_register_transport( |
1134 | &iscsi_sw_tcp_transport); | |
1135 | if (!iscsi_sw_tcp_scsi_transport) | |
ffbfe925 | 1136 | return -ENODEV; |
7ba24713 | 1137 | |
7b8631b5 | 1138 | return 0; |
7ba24713 AA |
1139 | } |
1140 | ||
38e1a8f5 | 1141 | static void __exit iscsi_sw_tcp_exit(void) |
7ba24713 | 1142 | { |
38e1a8f5 | 1143 | iscsi_unregister_transport(&iscsi_sw_tcp_transport); |
7ba24713 AA |
1144 | } |
1145 | ||
38e1a8f5 MC |
1146 | module_init(iscsi_sw_tcp_init); |
1147 | module_exit(iscsi_sw_tcp_exit); |