2 * iSCSI Initiator over TCP/IP Data-Path
4 * Copyright (C) 2004 Dmitry Yusupov
5 * Copyright (C) 2004 Alex Aizman
6 * Copyright (C) 2005 - 2006 Mike Christie
7 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
8 * maintained by open-iscsi@googlegroups.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * See the file COPYING included with this distribution for more details.
29 #include <linux/types.h>
30 #include <linux/inet.h>
31 #include <linux/slab.h>
32 #include <linux/file.h>
33 #include <linux/blkdev.h>
34 #include <linux/crypto.h>
35 #include <linux/delay.h>
36 #include <linux/kfifo.h>
37 #include <linux/scatterlist.h>
38 #include <linux/module.h>
40 #include <scsi/scsi_cmnd.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_transport_iscsi.h>
46 #include "iscsi_tcp.h"
48 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
49 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
50 "Alex Aizman <itn780@yahoo.com>");
51 MODULE_DESCRIPTION("iSCSI/TCP data-path");
52 MODULE_LICENSE("GPL");
54 static struct scsi_transport_template
*iscsi_sw_tcp_scsi_transport
;
55 static struct scsi_host_template iscsi_sw_tcp_sht
;
56 static struct iscsi_transport iscsi_sw_tcp_transport
;
58 static unsigned int iscsi_max_lun
= ~0;
59 module_param_named(max_lun
, iscsi_max_lun
, uint
, S_IRUGO
);
61 static int iscsi_sw_tcp_dbg
;
62 module_param_named(debug_iscsi_tcp
, iscsi_sw_tcp_dbg
, int,
64 MODULE_PARM_DESC(debug_iscsi_tcp
, "Turn on debugging for iscsi_tcp module "
65 "Set to 1 to turn on, and zero to turn off. Default is off.");
67 #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
69 if (iscsi_sw_tcp_dbg) \
70 iscsi_conn_printk(KERN_INFO, _conn, \
77 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
78 * @rd_desc: read descriptor
80 * @offset: offset in skb
81 * @len: skb->len - offset
83 static int iscsi_sw_tcp_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
,
84 unsigned int offset
, size_t len
)
86 struct iscsi_conn
*conn
= rd_desc
->arg
.data
;
87 unsigned int consumed
, total_consumed
= 0;
90 ISCSI_SW_TCP_DBG(conn
, "in %d bytes\n", skb
->len
- offset
);
94 consumed
= iscsi_tcp_recv_skb(conn
, skb
, offset
, 0, &status
);
96 total_consumed
+= consumed
;
97 } while (consumed
!= 0 && status
!= ISCSI_TCP_SKB_DONE
);
99 ISCSI_SW_TCP_DBG(conn
, "read %d bytes status %d\n",
100 skb
->len
- offset
, status
);
101 return total_consumed
;
105 * iscsi_sw_sk_state_check - check socket state
108 * If the socket is in CLOSE or CLOSE_WAIT we should
109 * not close the connection if there is still some
112 * Must be called with sk_callback_lock.
114 static inline int iscsi_sw_sk_state_check(struct sock
*sk
)
116 struct iscsi_conn
*conn
= sk
->sk_user_data
;
118 if ((sk
->sk_state
== TCP_CLOSE_WAIT
|| sk
->sk_state
== TCP_CLOSE
) &&
119 !atomic_read(&sk
->sk_rmem_alloc
)) {
120 ISCSI_SW_TCP_DBG(conn
, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
121 iscsi_conn_failure(conn
, ISCSI_ERR_TCP_CONN_CLOSE
);
127 static void iscsi_sw_tcp_data_ready(struct sock
*sk
, int flag
)
129 struct iscsi_conn
*conn
;
130 struct iscsi_tcp_conn
*tcp_conn
;
131 read_descriptor_t rd_desc
;
133 read_lock(&sk
->sk_callback_lock
);
134 conn
= sk
->sk_user_data
;
136 read_unlock(&sk
->sk_callback_lock
);
139 tcp_conn
= conn
->dd_data
;
142 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
143 * We set count to 1 because we want the network layer to
144 * hand us all the skbs that are available. iscsi_tcp_recv
145 * handled pdus that cross buffers or pdus that still need data.
147 rd_desc
.arg
.data
= conn
;
149 tcp_read_sock(sk
, &rd_desc
, iscsi_sw_tcp_recv
);
151 iscsi_sw_sk_state_check(sk
);
153 /* If we had to (atomically) map a highmem page,
155 iscsi_tcp_segment_unmap(&tcp_conn
->in
.segment
);
156 read_unlock(&sk
->sk_callback_lock
);
159 static void iscsi_sw_tcp_state_change(struct sock
*sk
)
161 struct iscsi_tcp_conn
*tcp_conn
;
162 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
163 struct iscsi_conn
*conn
;
164 struct iscsi_session
*session
;
165 void (*old_state_change
)(struct sock
*);
167 read_lock(&sk
->sk_callback_lock
);
168 conn
= sk
->sk_user_data
;
170 read_unlock(&sk
->sk_callback_lock
);
173 session
= conn
->session
;
175 iscsi_sw_sk_state_check(sk
);
177 tcp_conn
= conn
->dd_data
;
178 tcp_sw_conn
= tcp_conn
->dd_data
;
179 old_state_change
= tcp_sw_conn
->old_state_change
;
181 read_unlock(&sk
->sk_callback_lock
);
183 old_state_change(sk
);
187 * iscsi_write_space - Called when more output buffer space is available
188 * @sk: socket space is available for
190 static void iscsi_sw_tcp_write_space(struct sock
*sk
)
192 struct iscsi_conn
*conn
;
193 struct iscsi_tcp_conn
*tcp_conn
;
194 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
195 void (*old_write_space
)(struct sock
*);
197 read_lock_bh(&sk
->sk_callback_lock
);
198 conn
= sk
->sk_user_data
;
200 read_unlock_bh(&sk
->sk_callback_lock
);
204 tcp_conn
= conn
->dd_data
;
205 tcp_sw_conn
= tcp_conn
->dd_data
;
206 old_write_space
= tcp_sw_conn
->old_write_space
;
207 read_unlock_bh(&sk
->sk_callback_lock
);
211 ISCSI_SW_TCP_DBG(conn
, "iscsi_write_space\n");
212 iscsi_conn_queue_work(conn
);
215 static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn
*conn
)
217 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
218 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
219 struct sock
*sk
= tcp_sw_conn
->sock
->sk
;
221 /* assign new callbacks */
222 write_lock_bh(&sk
->sk_callback_lock
);
223 sk
->sk_user_data
= conn
;
224 tcp_sw_conn
->old_data_ready
= sk
->sk_data_ready
;
225 tcp_sw_conn
->old_state_change
= sk
->sk_state_change
;
226 tcp_sw_conn
->old_write_space
= sk
->sk_write_space
;
227 sk
->sk_data_ready
= iscsi_sw_tcp_data_ready
;
228 sk
->sk_state_change
= iscsi_sw_tcp_state_change
;
229 sk
->sk_write_space
= iscsi_sw_tcp_write_space
;
230 write_unlock_bh(&sk
->sk_callback_lock
);
234 iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn
*conn
)
236 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
237 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
238 struct sock
*sk
= tcp_sw_conn
->sock
->sk
;
240 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
241 write_lock_bh(&sk
->sk_callback_lock
);
242 sk
->sk_user_data
= NULL
;
243 sk
->sk_data_ready
= tcp_sw_conn
->old_data_ready
;
244 sk
->sk_state_change
= tcp_sw_conn
->old_state_change
;
245 sk
->sk_write_space
= tcp_sw_conn
->old_write_space
;
247 write_unlock_bh(&sk
->sk_callback_lock
);
251 * iscsi_sw_tcp_xmit_segment - transmit segment
252 * @tcp_conn: the iSCSI TCP connection
253 * @segment: the buffer to transmnit
255 * This function transmits as much of the buffer as
256 * the network layer will accept, and returns the number of
259 * If CRC hashing is enabled, the function will compute the
260 * hash as it goes. When the entire segment has been transmitted,
261 * it will retrieve the hash value and send it as well.
263 static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn
*tcp_conn
,
264 struct iscsi_segment
*segment
)
266 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
267 struct socket
*sk
= tcp_sw_conn
->sock
;
268 unsigned int copied
= 0;
271 while (!iscsi_tcp_segment_done(tcp_conn
, segment
, 0, r
)) {
272 struct scatterlist
*sg
;
273 unsigned int offset
, copy
;
277 offset
= segment
->copied
;
278 copy
= segment
->size
- offset
;
280 if (segment
->total_copied
+ segment
->size
< segment
->total_size
)
283 /* Use sendpage if we can; else fall back to sendmsg */
284 if (!segment
->data
) {
286 offset
+= segment
->sg_offset
+ sg
->offset
;
287 r
= tcp_sw_conn
->sendpage(sk
, sg_page(sg
), offset
,
290 struct msghdr msg
= { .msg_flags
= flags
};
292 .iov_base
= segment
->data
+ offset
,
296 r
= kernel_sendmsg(sk
, &msg
, &iov
, 1, copy
);
300 iscsi_tcp_segment_unmap(segment
);
309 * iscsi_sw_tcp_xmit - TCP transmit
311 static int iscsi_sw_tcp_xmit(struct iscsi_conn
*conn
)
313 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
314 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
315 struct iscsi_segment
*segment
= &tcp_sw_conn
->out
.segment
;
316 unsigned int consumed
= 0;
320 rc
= iscsi_sw_tcp_xmit_segment(tcp_conn
, segment
);
322 * We may not have been able to send data because the conn
323 * is getting stopped. libiscsi will know so propagate err
324 * for it to do the right thing.
329 rc
= ISCSI_ERR_XMIT_FAILED
;
336 if (segment
->total_copied
>= segment
->total_size
) {
337 if (segment
->done
!= NULL
) {
338 rc
= segment
->done(tcp_conn
, segment
);
345 ISCSI_SW_TCP_DBG(conn
, "xmit %d bytes\n", consumed
);
347 conn
->txdata_octets
+= consumed
;
351 /* Transmit error. We could initiate error recovery
353 ISCSI_SW_TCP_DBG(conn
, "Error sending PDU, errno=%d\n", rc
);
354 iscsi_conn_failure(conn
, rc
);
359 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
361 static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn
*conn
)
363 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
364 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
365 struct iscsi_segment
*segment
= &tcp_sw_conn
->out
.segment
;
367 return segment
->total_copied
- segment
->total_size
;
370 static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task
*task
)
372 struct iscsi_conn
*conn
= task
->conn
;
373 unsigned long pflags
= current
->flags
;
376 current
->flags
|= PF_MEMALLOC
;
378 while (iscsi_sw_tcp_xmit_qlen(conn
)) {
379 rc
= iscsi_sw_tcp_xmit(conn
);
389 tsk_restore_flags(current
, pflags
, PF_MEMALLOC
);
394 * This is called when we're done sending the header.
395 * Simply copy the data_segment to the send segment, and return.
397 static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn
*tcp_conn
,
398 struct iscsi_segment
*segment
)
400 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
402 tcp_sw_conn
->out
.segment
= tcp_sw_conn
->out
.data_segment
;
403 ISCSI_SW_TCP_DBG(tcp_conn
->iscsi_conn
,
404 "Header done. Next segment size %u total_size %u\n",
405 tcp_sw_conn
->out
.segment
.size
,
406 tcp_sw_conn
->out
.segment
.total_size
);
410 static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn
*conn
, void *hdr
,
413 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
414 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
416 ISCSI_SW_TCP_DBG(conn
, "%s\n", conn
->hdrdgst_en
?
417 "digest enabled" : "digest disabled");
419 /* Clear the data segment - needs to be filled in by the
420 * caller using iscsi_tcp_send_data_prep() */
421 memset(&tcp_sw_conn
->out
.data_segment
, 0,
422 sizeof(struct iscsi_segment
));
424 /* If header digest is enabled, compute the CRC and
425 * place the digest into the same buffer. We make
426 * sure that both iscsi_tcp_task and mtask have
429 if (conn
->hdrdgst_en
) {
430 iscsi_tcp_dgst_header(&tcp_sw_conn
->tx_hash
, hdr
, hdrlen
,
432 hdrlen
+= ISCSI_DIGEST_SIZE
;
435 /* Remember header pointer for later, when we need
436 * to decide whether there's a payload to go along
437 * with the header. */
438 tcp_sw_conn
->out
.hdr
= hdr
;
440 iscsi_segment_init_linear(&tcp_sw_conn
->out
.segment
, hdr
, hdrlen
,
441 iscsi_sw_tcp_send_hdr_done
, NULL
);
445 * Prepare the send buffer for the payload data.
446 * Padding and checksumming will all be taken care
447 * of by the iscsi_segment routines.
450 iscsi_sw_tcp_send_data_prep(struct iscsi_conn
*conn
, struct scatterlist
*sg
,
451 unsigned int count
, unsigned int offset
,
454 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
455 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
456 struct hash_desc
*tx_hash
= NULL
;
457 unsigned int hdr_spec_len
;
459 ISCSI_SW_TCP_DBG(conn
, "offset=%d, datalen=%d %s\n", offset
, len
,
461 "digest enabled" : "digest disabled");
463 /* Make sure the datalen matches what the caller
464 said he would send. */
465 hdr_spec_len
= ntoh24(tcp_sw_conn
->out
.hdr
->dlength
);
466 WARN_ON(iscsi_padded(len
) != iscsi_padded(hdr_spec_len
));
468 if (conn
->datadgst_en
)
469 tx_hash
= &tcp_sw_conn
->tx_hash
;
471 return iscsi_segment_seek_sg(&tcp_sw_conn
->out
.data_segment
,
472 sg
, count
, offset
, len
,
477 iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn
*conn
, void *data
,
480 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
481 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
482 struct hash_desc
*tx_hash
= NULL
;
483 unsigned int hdr_spec_len
;
485 ISCSI_SW_TCP_DBG(conn
, "datalen=%zd %s\n", len
, conn
->datadgst_en
?
486 "digest enabled" : "digest disabled");
488 /* Make sure the datalen matches what the caller
489 said he would send. */
490 hdr_spec_len
= ntoh24(tcp_sw_conn
->out
.hdr
->dlength
);
491 WARN_ON(iscsi_padded(len
) != iscsi_padded(hdr_spec_len
));
493 if (conn
->datadgst_en
)
494 tx_hash
= &tcp_sw_conn
->tx_hash
;
496 iscsi_segment_init_linear(&tcp_sw_conn
->out
.data_segment
,
497 data
, len
, NULL
, tx_hash
);
500 static int iscsi_sw_tcp_pdu_init(struct iscsi_task
*task
,
501 unsigned int offset
, unsigned int count
)
503 struct iscsi_conn
*conn
= task
->conn
;
506 iscsi_sw_tcp_send_hdr_prep(conn
, task
->hdr
, task
->hdr_len
);
512 iscsi_sw_tcp_send_linear_data_prep(conn
, task
->data
, count
);
514 struct scsi_data_buffer
*sdb
= scsi_out(task
->sc
);
516 err
= iscsi_sw_tcp_send_data_prep(conn
, sdb
->table
.sgl
,
517 sdb
->table
.nents
, offset
,
522 /* got invalid offset/len */
528 static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task
*task
, uint8_t opcode
)
530 struct iscsi_tcp_task
*tcp_task
= task
->dd_data
;
532 task
->hdr
= task
->dd_data
+ sizeof(*tcp_task
);
533 task
->hdr_max
= sizeof(struct iscsi_sw_tcp_hdrbuf
) - ISCSI_DIGEST_SIZE
;
537 static struct iscsi_cls_conn
*
538 iscsi_sw_tcp_conn_create(struct iscsi_cls_session
*cls_session
,
541 struct iscsi_conn
*conn
;
542 struct iscsi_cls_conn
*cls_conn
;
543 struct iscsi_tcp_conn
*tcp_conn
;
544 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
546 cls_conn
= iscsi_tcp_conn_setup(cls_session
, sizeof(*tcp_sw_conn
),
550 conn
= cls_conn
->dd_data
;
551 tcp_conn
= conn
->dd_data
;
552 tcp_sw_conn
= tcp_conn
->dd_data
;
554 tcp_sw_conn
->tx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
556 tcp_sw_conn
->tx_hash
.flags
= 0;
557 if (IS_ERR(tcp_sw_conn
->tx_hash
.tfm
))
560 tcp_sw_conn
->rx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
562 tcp_sw_conn
->rx_hash
.flags
= 0;
563 if (IS_ERR(tcp_sw_conn
->rx_hash
.tfm
))
565 tcp_conn
->rx_hash
= &tcp_sw_conn
->rx_hash
;
570 crypto_free_hash(tcp_sw_conn
->tx_hash
.tfm
);
572 iscsi_conn_printk(KERN_ERR
, conn
,
573 "Could not create connection due to crc32c "
574 "loading error. Make sure the crc32c "
575 "module is built as a module or into the "
577 iscsi_tcp_conn_teardown(cls_conn
);
581 static void iscsi_sw_tcp_release_conn(struct iscsi_conn
*conn
)
583 struct iscsi_session
*session
= conn
->session
;
584 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
585 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
586 struct socket
*sock
= tcp_sw_conn
->sock
;
592 iscsi_sw_tcp_conn_restore_callbacks(conn
);
595 spin_lock_bh(&session
->lock
);
596 tcp_sw_conn
->sock
= NULL
;
597 spin_unlock_bh(&session
->lock
);
601 static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn
*cls_conn
)
603 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
604 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
605 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
607 iscsi_sw_tcp_release_conn(conn
);
609 if (tcp_sw_conn
->tx_hash
.tfm
)
610 crypto_free_hash(tcp_sw_conn
->tx_hash
.tfm
);
611 if (tcp_sw_conn
->rx_hash
.tfm
)
612 crypto_free_hash(tcp_sw_conn
->rx_hash
.tfm
);
614 iscsi_tcp_conn_teardown(cls_conn
);
617 static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
619 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
620 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
621 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
622 struct socket
*sock
= tcp_sw_conn
->sock
;
624 /* userspace may have goofed up and not bound us */
628 sock
->sk
->sk_err
= EIO
;
629 wake_up_interruptible(sk_sleep(sock
->sk
));
632 iscsi_suspend_tx(conn
);
634 /* stop recv side and release socket */
635 iscsi_sw_tcp_release_conn(conn
);
637 iscsi_conn_stop(cls_conn
, flag
);
641 iscsi_sw_tcp_conn_bind(struct iscsi_cls_session
*cls_session
,
642 struct iscsi_cls_conn
*cls_conn
, uint64_t transport_eph
,
645 struct iscsi_session
*session
= cls_session
->dd_data
;
646 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
647 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
648 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
653 /* lookup for existing socket */
654 sock
= sockfd_lookup((int)transport_eph
, &err
);
656 iscsi_conn_printk(KERN_ERR
, conn
,
657 "sockfd_lookup failed %d\n", err
);
661 err
= iscsi_conn_bind(cls_session
, cls_conn
, is_leading
);
665 spin_lock_bh(&session
->lock
);
666 /* bind iSCSI connection and socket */
667 tcp_sw_conn
->sock
= sock
;
668 spin_unlock_bh(&session
->lock
);
670 /* setup Socket parameters */
672 sk
->sk_reuse
= SK_CAN_REUSE
;
673 sk
->sk_sndtimeo
= 15 * HZ
; /* FIXME: make it configurable */
674 sk
->sk_allocation
= GFP_ATOMIC
;
677 iscsi_sw_tcp_conn_set_callbacks(conn
);
678 tcp_sw_conn
->sendpage
= tcp_sw_conn
->sock
->ops
->sendpage
;
680 * set receive state machine into initial state
682 iscsi_tcp_hdr_recv_prep(tcp_conn
);
690 static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn
*cls_conn
,
691 enum iscsi_param param
, char *buf
,
694 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
695 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
696 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
699 case ISCSI_PARAM_HDRDGST_EN
:
700 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
702 case ISCSI_PARAM_DATADGST_EN
:
703 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
704 tcp_sw_conn
->sendpage
= conn
->datadgst_en
?
705 sock_no_sendpage
: tcp_sw_conn
->sock
->ops
->sendpage
;
707 case ISCSI_PARAM_MAX_R2T
:
708 return iscsi_tcp_set_max_r2t(conn
, buf
);
710 return iscsi_set_param(cls_conn
, param
, buf
, buflen
);
716 static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
717 enum iscsi_param param
, char *buf
)
719 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
720 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
721 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
722 struct sockaddr_in6 addr
;
726 case ISCSI_PARAM_CONN_PORT
:
727 case ISCSI_PARAM_CONN_ADDRESS
:
728 spin_lock_bh(&conn
->session
->lock
);
729 if (!tcp_sw_conn
|| !tcp_sw_conn
->sock
) {
730 spin_unlock_bh(&conn
->session
->lock
);
733 rc
= kernel_getpeername(tcp_sw_conn
->sock
,
734 (struct sockaddr
*)&addr
, &len
);
735 spin_unlock_bh(&conn
->session
->lock
);
739 return iscsi_conn_get_addr_param((struct sockaddr_storage
*)
742 return iscsi_conn_get_param(cls_conn
, param
, buf
);
748 static int iscsi_sw_tcp_host_get_param(struct Scsi_Host
*shost
,
749 enum iscsi_host_param param
, char *buf
)
751 struct iscsi_sw_tcp_host
*tcp_sw_host
= iscsi_host_priv(shost
);
752 struct iscsi_session
*session
= tcp_sw_host
->session
;
753 struct iscsi_conn
*conn
;
754 struct iscsi_tcp_conn
*tcp_conn
;
755 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
756 struct sockaddr_in6 addr
;
760 case ISCSI_HOST_PARAM_IPADDRESS
:
761 spin_lock_bh(&session
->lock
);
762 conn
= session
->leadconn
;
764 spin_unlock_bh(&session
->lock
);
767 tcp_conn
= conn
->dd_data
;
769 tcp_sw_conn
= tcp_conn
->dd_data
;
770 if (!tcp_sw_conn
->sock
) {
771 spin_unlock_bh(&session
->lock
);
775 rc
= kernel_getsockname(tcp_sw_conn
->sock
,
776 (struct sockaddr
*)&addr
, &len
);
777 spin_unlock_bh(&session
->lock
);
781 return iscsi_conn_get_addr_param((struct sockaddr_storage
*)
784 return iscsi_host_get_param(shost
, param
, buf
);
791 iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn
*cls_conn
,
792 struct iscsi_stats
*stats
)
794 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
795 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
796 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
798 stats
->custom_length
= 3;
799 strcpy(stats
->custom
[0].desc
, "tx_sendpage_failures");
800 stats
->custom
[0].value
= tcp_sw_conn
->sendpage_failures_cnt
;
801 strcpy(stats
->custom
[1].desc
, "rx_discontiguous_hdr");
802 stats
->custom
[1].value
= tcp_sw_conn
->discontiguous_hdr_cnt
;
803 strcpy(stats
->custom
[2].desc
, "eh_abort_cnt");
804 stats
->custom
[2].value
= conn
->eh_abort_cnt
;
806 iscsi_tcp_conn_get_stats(cls_conn
, stats
);
809 static struct iscsi_cls_session
*
810 iscsi_sw_tcp_session_create(struct iscsi_endpoint
*ep
, uint16_t cmds_max
,
811 uint16_t qdepth
, uint32_t initial_cmdsn
)
813 struct iscsi_cls_session
*cls_session
;
814 struct iscsi_session
*session
;
815 struct iscsi_sw_tcp_host
*tcp_sw_host
;
816 struct Scsi_Host
*shost
;
819 printk(KERN_ERR
"iscsi_tcp: invalid ep %p.\n", ep
);
823 shost
= iscsi_host_alloc(&iscsi_sw_tcp_sht
,
824 sizeof(struct iscsi_sw_tcp_host
), 1);
827 shost
->transportt
= iscsi_sw_tcp_scsi_transport
;
828 shost
->cmd_per_lun
= qdepth
;
829 shost
->max_lun
= iscsi_max_lun
;
831 shost
->max_channel
= 0;
832 shost
->max_cmd_len
= SCSI_MAX_VARLEN_CDB_SIZE
;
834 if (iscsi_host_add(shost
, NULL
))
837 cls_session
= iscsi_session_setup(&iscsi_sw_tcp_transport
, shost
,
839 sizeof(struct iscsi_tcp_task
) +
840 sizeof(struct iscsi_sw_tcp_hdrbuf
),
844 session
= cls_session
->dd_data
;
845 tcp_sw_host
= iscsi_host_priv(shost
);
846 tcp_sw_host
->session
= session
;
848 shost
->can_queue
= session
->scsi_cmds_max
;
849 if (iscsi_tcp_r2tpool_alloc(session
))
854 iscsi_session_teardown(cls_session
);
856 iscsi_host_remove(shost
);
858 iscsi_host_free(shost
);
862 static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session
*cls_session
)
864 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
866 iscsi_tcp_r2tpool_free(cls_session
->dd_data
);
867 iscsi_session_teardown(cls_session
);
869 iscsi_host_remove(shost
);
870 iscsi_host_free(shost
);
873 static umode_t
iscsi_sw_tcp_attr_is_visible(int param_type
, int param
)
875 switch (param_type
) {
876 case ISCSI_HOST_PARAM
:
878 case ISCSI_HOST_PARAM_NETDEV_NAME
:
879 case ISCSI_HOST_PARAM_HWADDRESS
:
880 case ISCSI_HOST_PARAM_IPADDRESS
:
881 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
888 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
889 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
890 case ISCSI_PARAM_HDRDGST_EN
:
891 case ISCSI_PARAM_DATADGST_EN
:
892 case ISCSI_PARAM_CONN_ADDRESS
:
893 case ISCSI_PARAM_CONN_PORT
:
894 case ISCSI_PARAM_EXP_STATSN
:
895 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
896 case ISCSI_PARAM_PERSISTENT_PORT
:
897 case ISCSI_PARAM_PING_TMO
:
898 case ISCSI_PARAM_RECV_TMO
:
899 case ISCSI_PARAM_INITIAL_R2T_EN
:
900 case ISCSI_PARAM_MAX_R2T
:
901 case ISCSI_PARAM_IMM_DATA_EN
:
902 case ISCSI_PARAM_FIRST_BURST
:
903 case ISCSI_PARAM_MAX_BURST
:
904 case ISCSI_PARAM_PDU_INORDER_EN
:
905 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
906 case ISCSI_PARAM_ERL
:
907 case ISCSI_PARAM_TARGET_NAME
:
908 case ISCSI_PARAM_TPGT
:
909 case ISCSI_PARAM_USERNAME
:
910 case ISCSI_PARAM_PASSWORD
:
911 case ISCSI_PARAM_USERNAME_IN
:
912 case ISCSI_PARAM_PASSWORD_IN
:
913 case ISCSI_PARAM_FAST_ABORT
:
914 case ISCSI_PARAM_ABORT_TMO
:
915 case ISCSI_PARAM_LU_RESET_TMO
:
916 case ISCSI_PARAM_TGT_RESET_TMO
:
917 case ISCSI_PARAM_IFACE_NAME
:
918 case ISCSI_PARAM_INITIATOR_NAME
:
928 static int iscsi_sw_tcp_slave_alloc(struct scsi_device
*sdev
)
930 set_bit(QUEUE_FLAG_BIDI
, &sdev
->request_queue
->queue_flags
);
934 static int iscsi_sw_tcp_slave_configure(struct scsi_device
*sdev
)
936 blk_queue_bounce_limit(sdev
->request_queue
, BLK_BOUNCE_ANY
);
937 blk_queue_dma_alignment(sdev
->request_queue
, 0);
941 static struct scsi_host_template iscsi_sw_tcp_sht
= {
942 .module
= THIS_MODULE
,
943 .name
= "iSCSI Initiator over TCP/IP",
944 .queuecommand
= iscsi_queuecommand
,
945 .change_queue_depth
= iscsi_change_queue_depth
,
946 .can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
- 1,
947 .sg_tablesize
= 4096,
948 .max_sectors
= 0xFFFF,
949 .cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
,
950 .eh_abort_handler
= iscsi_eh_abort
,
951 .eh_device_reset_handler
= iscsi_eh_device_reset
,
952 .eh_target_reset_handler
= iscsi_eh_recover_target
,
953 .use_clustering
= DISABLE_CLUSTERING
,
954 .slave_alloc
= iscsi_sw_tcp_slave_alloc
,
955 .slave_configure
= iscsi_sw_tcp_slave_configure
,
956 .target_alloc
= iscsi_target_alloc
,
957 .proc_name
= "iscsi_tcp",
961 static struct iscsi_transport iscsi_sw_tcp_transport
= {
962 .owner
= THIS_MODULE
,
964 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_HDRDGST
966 /* session management */
967 .create_session
= iscsi_sw_tcp_session_create
,
968 .destroy_session
= iscsi_sw_tcp_session_destroy
,
969 /* connection management */
970 .create_conn
= iscsi_sw_tcp_conn_create
,
971 .bind_conn
= iscsi_sw_tcp_conn_bind
,
972 .destroy_conn
= iscsi_sw_tcp_conn_destroy
,
973 .attr_is_visible
= iscsi_sw_tcp_attr_is_visible
,
974 .set_param
= iscsi_sw_tcp_conn_set_param
,
975 .get_conn_param
= iscsi_sw_tcp_conn_get_param
,
976 .get_session_param
= iscsi_session_get_param
,
977 .start_conn
= iscsi_conn_start
,
978 .stop_conn
= iscsi_sw_tcp_conn_stop
,
979 /* iscsi host params */
980 .get_host_param
= iscsi_sw_tcp_host_get_param
,
981 .set_host_param
= iscsi_host_set_param
,
983 .send_pdu
= iscsi_conn_send_pdu
,
984 .get_stats
= iscsi_sw_tcp_conn_get_stats
,
985 /* iscsi task/cmd helpers */
986 .init_task
= iscsi_tcp_task_init
,
987 .xmit_task
= iscsi_tcp_task_xmit
,
988 .cleanup_task
= iscsi_tcp_cleanup_task
,
989 /* low level pdu helpers */
990 .xmit_pdu
= iscsi_sw_tcp_pdu_xmit
,
991 .init_pdu
= iscsi_sw_tcp_pdu_init
,
992 .alloc_pdu
= iscsi_sw_tcp_pdu_alloc
,
994 .session_recovery_timedout
= iscsi_session_recovery_timedout
,
997 static int __init
iscsi_sw_tcp_init(void)
999 if (iscsi_max_lun
< 1) {
1000 printk(KERN_ERR
"iscsi_tcp: Invalid max_lun value of %u\n",
1005 iscsi_sw_tcp_scsi_transport
= iscsi_register_transport(
1006 &iscsi_sw_tcp_transport
);
1007 if (!iscsi_sw_tcp_scsi_transport
)
1013 static void __exit
iscsi_sw_tcp_exit(void)
1015 iscsi_unregister_transport(&iscsi_sw_tcp_transport
);
1018 module_init(iscsi_sw_tcp_init
);
1019 module_exit(iscsi_sw_tcp_exit
);