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 <crypto/hash.h>
30 #include <linux/types.h>
31 #include <linux/inet.h>
32 #include <linux/slab.h>
33 #include <linux/file.h>
34 #include <linux/blkdev.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 (conn
->session
->state
!= ISCSI_STATE_LOGGING_OUT
) &&
120 !atomic_read(&sk
->sk_rmem_alloc
)) {
121 ISCSI_SW_TCP_DBG(conn
, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
122 iscsi_conn_failure(conn
, ISCSI_ERR_TCP_CONN_CLOSE
);
128 static void iscsi_sw_tcp_data_ready(struct sock
*sk
)
130 struct iscsi_conn
*conn
;
131 struct iscsi_tcp_conn
*tcp_conn
;
132 read_descriptor_t rd_desc
;
134 read_lock_bh(&sk
->sk_callback_lock
);
135 conn
= sk
->sk_user_data
;
137 read_unlock_bh(&sk
->sk_callback_lock
);
140 tcp_conn
= conn
->dd_data
;
143 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
144 * We set count to 1 because we want the network layer to
145 * hand us all the skbs that are available. iscsi_tcp_recv
146 * handled pdus that cross buffers or pdus that still need data.
148 rd_desc
.arg
.data
= conn
;
150 tcp_read_sock(sk
, &rd_desc
, iscsi_sw_tcp_recv
);
152 iscsi_sw_sk_state_check(sk
);
154 /* If we had to (atomically) map a highmem page,
156 iscsi_tcp_segment_unmap(&tcp_conn
->in
.segment
);
157 read_unlock_bh(&sk
->sk_callback_lock
);
160 static void iscsi_sw_tcp_state_change(struct sock
*sk
)
162 struct iscsi_tcp_conn
*tcp_conn
;
163 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
164 struct iscsi_conn
*conn
;
165 struct iscsi_session
*session
;
166 void (*old_state_change
)(struct sock
*);
168 read_lock_bh(&sk
->sk_callback_lock
);
169 conn
= sk
->sk_user_data
;
171 read_unlock_bh(&sk
->sk_callback_lock
);
174 session
= conn
->session
;
176 iscsi_sw_sk_state_check(sk
);
178 tcp_conn
= conn
->dd_data
;
179 tcp_sw_conn
= tcp_conn
->dd_data
;
180 old_state_change
= tcp_sw_conn
->old_state_change
;
182 read_unlock_bh(&sk
->sk_callback_lock
);
184 old_state_change(sk
);
188 * iscsi_write_space - Called when more output buffer space is available
189 * @sk: socket space is available for
191 static void iscsi_sw_tcp_write_space(struct sock
*sk
)
193 struct iscsi_conn
*conn
;
194 struct iscsi_tcp_conn
*tcp_conn
;
195 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
196 void (*old_write_space
)(struct sock
*);
198 read_lock_bh(&sk
->sk_callback_lock
);
199 conn
= sk
->sk_user_data
;
201 read_unlock_bh(&sk
->sk_callback_lock
);
205 tcp_conn
= conn
->dd_data
;
206 tcp_sw_conn
= tcp_conn
->dd_data
;
207 old_write_space
= tcp_sw_conn
->old_write_space
;
208 read_unlock_bh(&sk
->sk_callback_lock
);
212 ISCSI_SW_TCP_DBG(conn
, "iscsi_write_space\n");
213 iscsi_conn_queue_work(conn
);
216 static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn
*conn
)
218 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
219 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
220 struct sock
*sk
= tcp_sw_conn
->sock
->sk
;
222 /* assign new callbacks */
223 write_lock_bh(&sk
->sk_callback_lock
);
224 sk
->sk_user_data
= conn
;
225 tcp_sw_conn
->old_data_ready
= sk
->sk_data_ready
;
226 tcp_sw_conn
->old_state_change
= sk
->sk_state_change
;
227 tcp_sw_conn
->old_write_space
= sk
->sk_write_space
;
228 sk
->sk_data_ready
= iscsi_sw_tcp_data_ready
;
229 sk
->sk_state_change
= iscsi_sw_tcp_state_change
;
230 sk
->sk_write_space
= iscsi_sw_tcp_write_space
;
231 write_unlock_bh(&sk
->sk_callback_lock
);
235 iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn
*conn
)
237 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
238 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
239 struct sock
*sk
= tcp_sw_conn
->sock
->sk
;
241 /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
242 write_lock_bh(&sk
->sk_callback_lock
);
243 sk
->sk_user_data
= NULL
;
244 sk
->sk_data_ready
= tcp_sw_conn
->old_data_ready
;
245 sk
->sk_state_change
= tcp_sw_conn
->old_state_change
;
246 sk
->sk_write_space
= tcp_sw_conn
->old_write_space
;
247 sk
->sk_no_check_tx
= 0;
248 write_unlock_bh(&sk
->sk_callback_lock
);
252 * iscsi_sw_tcp_xmit_segment - transmit segment
253 * @tcp_conn: the iSCSI TCP connection
254 * @segment: the buffer to transmnit
256 * This function transmits as much of the buffer as
257 * the network layer will accept, and returns the number of
260 * If CRC hashing is enabled, the function will compute the
261 * hash as it goes. When the entire segment has been transmitted,
262 * it will retrieve the hash value and send it as well.
264 static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn
*tcp_conn
,
265 struct iscsi_segment
*segment
)
267 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
268 struct socket
*sk
= tcp_sw_conn
->sock
;
269 unsigned int copied
= 0;
272 while (!iscsi_tcp_segment_done(tcp_conn
, segment
, 0, r
)) {
273 struct scatterlist
*sg
;
274 unsigned int offset
, copy
;
278 offset
= segment
->copied
;
279 copy
= segment
->size
- offset
;
281 if (segment
->total_copied
+ segment
->size
< segment
->total_size
)
284 /* Use sendpage if we can; else fall back to sendmsg */
285 if (!segment
->data
) {
287 offset
+= segment
->sg_offset
+ sg
->offset
;
288 r
= tcp_sw_conn
->sendpage(sk
, sg_page(sg
), offset
,
291 struct msghdr msg
= { .msg_flags
= flags
};
293 .iov_base
= segment
->data
+ offset
,
297 r
= kernel_sendmsg(sk
, &msg
, &iov
, 1, copy
);
301 iscsi_tcp_segment_unmap(segment
);
310 * iscsi_sw_tcp_xmit - TCP transmit
312 static int iscsi_sw_tcp_xmit(struct iscsi_conn
*conn
)
314 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
315 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
316 struct iscsi_segment
*segment
= &tcp_sw_conn
->out
.segment
;
317 unsigned int consumed
= 0;
321 rc
= iscsi_sw_tcp_xmit_segment(tcp_conn
, segment
);
323 * We may not have been able to send data because the conn
324 * is getting stopped. libiscsi will know so propagate err
325 * for it to do the right thing.
330 rc
= ISCSI_ERR_XMIT_FAILED
;
337 if (segment
->total_copied
>= segment
->total_size
) {
338 if (segment
->done
!= NULL
) {
339 rc
= segment
->done(tcp_conn
, segment
);
346 ISCSI_SW_TCP_DBG(conn
, "xmit %d bytes\n", consumed
);
348 conn
->txdata_octets
+= consumed
;
352 /* Transmit error. We could initiate error recovery
354 ISCSI_SW_TCP_DBG(conn
, "Error sending PDU, errno=%d\n", rc
);
355 iscsi_conn_failure(conn
, rc
);
360 * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
362 static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn
*conn
)
364 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
365 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
366 struct iscsi_segment
*segment
= &tcp_sw_conn
->out
.segment
;
368 return segment
->total_copied
- segment
->total_size
;
371 static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task
*task
)
373 struct iscsi_conn
*conn
= task
->conn
;
374 unsigned long pflags
= current
->flags
;
377 current
->flags
|= PF_MEMALLOC
;
379 while (iscsi_sw_tcp_xmit_qlen(conn
)) {
380 rc
= iscsi_sw_tcp_xmit(conn
);
390 current_restore_flags(pflags
, PF_MEMALLOC
);
395 * This is called when we're done sending the header.
396 * Simply copy the data_segment to the send segment, and return.
398 static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn
*tcp_conn
,
399 struct iscsi_segment
*segment
)
401 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
403 tcp_sw_conn
->out
.segment
= tcp_sw_conn
->out
.data_segment
;
404 ISCSI_SW_TCP_DBG(tcp_conn
->iscsi_conn
,
405 "Header done. Next segment size %u total_size %u\n",
406 tcp_sw_conn
->out
.segment
.size
,
407 tcp_sw_conn
->out
.segment
.total_size
);
411 static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn
*conn
, void *hdr
,
414 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
415 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
417 ISCSI_SW_TCP_DBG(conn
, "%s\n", conn
->hdrdgst_en
?
418 "digest enabled" : "digest disabled");
420 /* Clear the data segment - needs to be filled in by the
421 * caller using iscsi_tcp_send_data_prep() */
422 memset(&tcp_sw_conn
->out
.data_segment
, 0,
423 sizeof(struct iscsi_segment
));
425 /* If header digest is enabled, compute the CRC and
426 * place the digest into the same buffer. We make
427 * sure that both iscsi_tcp_task and mtask have
430 if (conn
->hdrdgst_en
) {
431 iscsi_tcp_dgst_header(tcp_sw_conn
->tx_hash
, hdr
, hdrlen
,
433 hdrlen
+= ISCSI_DIGEST_SIZE
;
436 /* Remember header pointer for later, when we need
437 * to decide whether there's a payload to go along
438 * with the header. */
439 tcp_sw_conn
->out
.hdr
= hdr
;
441 iscsi_segment_init_linear(&tcp_sw_conn
->out
.segment
, hdr
, hdrlen
,
442 iscsi_sw_tcp_send_hdr_done
, NULL
);
446 * Prepare the send buffer for the payload data.
447 * Padding and checksumming will all be taken care
448 * of by the iscsi_segment routines.
451 iscsi_sw_tcp_send_data_prep(struct iscsi_conn
*conn
, struct scatterlist
*sg
,
452 unsigned int count
, unsigned int offset
,
455 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
456 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
457 struct ahash_request
*tx_hash
= NULL
;
458 unsigned int hdr_spec_len
;
460 ISCSI_SW_TCP_DBG(conn
, "offset=%d, datalen=%d %s\n", offset
, len
,
462 "digest enabled" : "digest disabled");
464 /* Make sure the datalen matches what the caller
465 said he would send. */
466 hdr_spec_len
= ntoh24(tcp_sw_conn
->out
.hdr
->dlength
);
467 WARN_ON(iscsi_padded(len
) != iscsi_padded(hdr_spec_len
));
469 if (conn
->datadgst_en
)
470 tx_hash
= tcp_sw_conn
->tx_hash
;
472 return iscsi_segment_seek_sg(&tcp_sw_conn
->out
.data_segment
,
473 sg
, count
, offset
, len
,
478 iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn
*conn
, void *data
,
481 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
482 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
483 struct ahash_request
*tx_hash
= NULL
;
484 unsigned int hdr_spec_len
;
486 ISCSI_SW_TCP_DBG(conn
, "datalen=%zd %s\n", len
, conn
->datadgst_en
?
487 "digest enabled" : "digest disabled");
489 /* Make sure the datalen matches what the caller
490 said he would send. */
491 hdr_spec_len
= ntoh24(tcp_sw_conn
->out
.hdr
->dlength
);
492 WARN_ON(iscsi_padded(len
) != iscsi_padded(hdr_spec_len
));
494 if (conn
->datadgst_en
)
495 tx_hash
= tcp_sw_conn
->tx_hash
;
497 iscsi_segment_init_linear(&tcp_sw_conn
->out
.data_segment
,
498 data
, len
, NULL
, tx_hash
);
501 static int iscsi_sw_tcp_pdu_init(struct iscsi_task
*task
,
502 unsigned int offset
, unsigned int count
)
504 struct iscsi_conn
*conn
= task
->conn
;
507 iscsi_sw_tcp_send_hdr_prep(conn
, task
->hdr
, task
->hdr_len
);
513 iscsi_sw_tcp_send_linear_data_prep(conn
, task
->data
, count
);
515 struct scsi_data_buffer
*sdb
= scsi_out(task
->sc
);
517 err
= iscsi_sw_tcp_send_data_prep(conn
, sdb
->table
.sgl
,
518 sdb
->table
.nents
, offset
,
523 /* got invalid offset/len */
529 static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task
*task
, uint8_t opcode
)
531 struct iscsi_tcp_task
*tcp_task
= task
->dd_data
;
533 task
->hdr
= task
->dd_data
+ sizeof(*tcp_task
);
534 task
->hdr_max
= sizeof(struct iscsi_sw_tcp_hdrbuf
) - ISCSI_DIGEST_SIZE
;
538 static struct iscsi_cls_conn
*
539 iscsi_sw_tcp_conn_create(struct iscsi_cls_session
*cls_session
,
542 struct iscsi_conn
*conn
;
543 struct iscsi_cls_conn
*cls_conn
;
544 struct iscsi_tcp_conn
*tcp_conn
;
545 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
546 struct crypto_ahash
*tfm
;
548 cls_conn
= iscsi_tcp_conn_setup(cls_session
, sizeof(*tcp_sw_conn
),
552 conn
= cls_conn
->dd_data
;
553 tcp_conn
= conn
->dd_data
;
554 tcp_sw_conn
= tcp_conn
->dd_data
;
556 tfm
= crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC
);
560 tcp_sw_conn
->tx_hash
= ahash_request_alloc(tfm
, GFP_KERNEL
);
561 if (!tcp_sw_conn
->tx_hash
)
563 ahash_request_set_callback(tcp_sw_conn
->tx_hash
, 0, NULL
, NULL
);
565 tcp_sw_conn
->rx_hash
= ahash_request_alloc(tfm
, GFP_KERNEL
);
566 if (!tcp_sw_conn
->rx_hash
)
568 ahash_request_set_callback(tcp_sw_conn
->rx_hash
, 0, NULL
, NULL
);
570 tcp_conn
->rx_hash
= tcp_sw_conn
->rx_hash
;
575 ahash_request_free(tcp_sw_conn
->tx_hash
);
577 crypto_free_ahash(tfm
);
579 iscsi_conn_printk(KERN_ERR
, conn
,
580 "Could not create connection due to crc32c "
581 "loading error. Make sure the crc32c "
582 "module is built as a module or into the "
584 iscsi_tcp_conn_teardown(cls_conn
);
588 static void iscsi_sw_tcp_release_conn(struct iscsi_conn
*conn
)
590 struct iscsi_session
*session
= conn
->session
;
591 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
592 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
593 struct socket
*sock
= tcp_sw_conn
->sock
;
599 iscsi_sw_tcp_conn_restore_callbacks(conn
);
602 spin_lock_bh(&session
->frwd_lock
);
603 tcp_sw_conn
->sock
= NULL
;
604 spin_unlock_bh(&session
->frwd_lock
);
608 static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn
*cls_conn
)
610 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
611 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
612 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
614 iscsi_sw_tcp_release_conn(conn
);
616 ahash_request_free(tcp_sw_conn
->rx_hash
);
617 if (tcp_sw_conn
->tx_hash
) {
618 struct crypto_ahash
*tfm
;
620 tfm
= crypto_ahash_reqtfm(tcp_sw_conn
->tx_hash
);
621 ahash_request_free(tcp_sw_conn
->tx_hash
);
622 crypto_free_ahash(tfm
);
625 iscsi_tcp_conn_teardown(cls_conn
);
628 static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn
*cls_conn
, int flag
)
630 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
631 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
632 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
633 struct socket
*sock
= tcp_sw_conn
->sock
;
635 /* userspace may have goofed up and not bound us */
639 sock
->sk
->sk_err
= EIO
;
640 wake_up_interruptible(sk_sleep(sock
->sk
));
643 iscsi_suspend_tx(conn
);
645 /* stop recv side and release socket */
646 iscsi_sw_tcp_release_conn(conn
);
648 iscsi_conn_stop(cls_conn
, flag
);
652 iscsi_sw_tcp_conn_bind(struct iscsi_cls_session
*cls_session
,
653 struct iscsi_cls_conn
*cls_conn
, uint64_t transport_eph
,
656 struct iscsi_session
*session
= cls_session
->dd_data
;
657 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
658 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
659 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
664 /* lookup for existing socket */
665 sock
= sockfd_lookup((int)transport_eph
, &err
);
667 iscsi_conn_printk(KERN_ERR
, conn
,
668 "sockfd_lookup failed %d\n", err
);
672 err
= iscsi_conn_bind(cls_session
, cls_conn
, is_leading
);
676 spin_lock_bh(&session
->frwd_lock
);
677 /* bind iSCSI connection and socket */
678 tcp_sw_conn
->sock
= sock
;
679 spin_unlock_bh(&session
->frwd_lock
);
681 /* setup Socket parameters */
683 sk
->sk_reuse
= SK_CAN_REUSE
;
684 sk
->sk_sndtimeo
= 15 * HZ
; /* FIXME: make it configurable */
685 sk
->sk_allocation
= GFP_ATOMIC
;
688 iscsi_sw_tcp_conn_set_callbacks(conn
);
689 tcp_sw_conn
->sendpage
= tcp_sw_conn
->sock
->ops
->sendpage
;
691 * set receive state machine into initial state
693 iscsi_tcp_hdr_recv_prep(tcp_conn
);
701 static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn
*cls_conn
,
702 enum iscsi_param param
, char *buf
,
705 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
706 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
707 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
710 case ISCSI_PARAM_HDRDGST_EN
:
711 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
713 case ISCSI_PARAM_DATADGST_EN
:
714 iscsi_set_param(cls_conn
, param
, buf
, buflen
);
715 tcp_sw_conn
->sendpage
= conn
->datadgst_en
?
716 sock_no_sendpage
: tcp_sw_conn
->sock
->ops
->sendpage
;
718 case ISCSI_PARAM_MAX_R2T
:
719 return iscsi_tcp_set_max_r2t(conn
, buf
);
721 return iscsi_set_param(cls_conn
, param
, buf
, buflen
);
727 static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
728 enum iscsi_param param
, char *buf
)
730 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
731 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
732 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
733 struct sockaddr_in6 addr
;
737 case ISCSI_PARAM_CONN_PORT
:
738 case ISCSI_PARAM_CONN_ADDRESS
:
739 case ISCSI_PARAM_LOCAL_PORT
:
740 spin_lock_bh(&conn
->session
->frwd_lock
);
741 if (!tcp_sw_conn
|| !tcp_sw_conn
->sock
) {
742 spin_unlock_bh(&conn
->session
->frwd_lock
);
745 if (param
== ISCSI_PARAM_LOCAL_PORT
)
746 rc
= kernel_getsockname(tcp_sw_conn
->sock
,
747 (struct sockaddr
*)&addr
, &len
);
749 rc
= kernel_getpeername(tcp_sw_conn
->sock
,
750 (struct sockaddr
*)&addr
, &len
);
751 spin_unlock_bh(&conn
->session
->frwd_lock
);
755 return iscsi_conn_get_addr_param((struct sockaddr_storage
*)
758 return iscsi_conn_get_param(cls_conn
, param
, buf
);
764 static int iscsi_sw_tcp_host_get_param(struct Scsi_Host
*shost
,
765 enum iscsi_host_param param
, char *buf
)
767 struct iscsi_sw_tcp_host
*tcp_sw_host
= iscsi_host_priv(shost
);
768 struct iscsi_session
*session
= tcp_sw_host
->session
;
769 struct iscsi_conn
*conn
;
770 struct iscsi_tcp_conn
*tcp_conn
;
771 struct iscsi_sw_tcp_conn
*tcp_sw_conn
;
772 struct sockaddr_in6 addr
;
776 case ISCSI_HOST_PARAM_IPADDRESS
:
780 spin_lock_bh(&session
->frwd_lock
);
781 conn
= session
->leadconn
;
783 spin_unlock_bh(&session
->frwd_lock
);
786 tcp_conn
= conn
->dd_data
;
788 tcp_sw_conn
= tcp_conn
->dd_data
;
789 if (!tcp_sw_conn
->sock
) {
790 spin_unlock_bh(&session
->frwd_lock
);
794 rc
= kernel_getsockname(tcp_sw_conn
->sock
,
795 (struct sockaddr
*)&addr
, &len
);
796 spin_unlock_bh(&session
->frwd_lock
);
800 return iscsi_conn_get_addr_param((struct sockaddr_storage
*)
803 return iscsi_host_get_param(shost
, param
, buf
);
810 iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn
*cls_conn
,
811 struct iscsi_stats
*stats
)
813 struct iscsi_conn
*conn
= cls_conn
->dd_data
;
814 struct iscsi_tcp_conn
*tcp_conn
= conn
->dd_data
;
815 struct iscsi_sw_tcp_conn
*tcp_sw_conn
= tcp_conn
->dd_data
;
817 stats
->custom_length
= 3;
818 strcpy(stats
->custom
[0].desc
, "tx_sendpage_failures");
819 stats
->custom
[0].value
= tcp_sw_conn
->sendpage_failures_cnt
;
820 strcpy(stats
->custom
[1].desc
, "rx_discontiguous_hdr");
821 stats
->custom
[1].value
= tcp_sw_conn
->discontiguous_hdr_cnt
;
822 strcpy(stats
->custom
[2].desc
, "eh_abort_cnt");
823 stats
->custom
[2].value
= conn
->eh_abort_cnt
;
825 iscsi_tcp_conn_get_stats(cls_conn
, stats
);
828 static struct iscsi_cls_session
*
829 iscsi_sw_tcp_session_create(struct iscsi_endpoint
*ep
, uint16_t cmds_max
,
830 uint16_t qdepth
, uint32_t initial_cmdsn
)
832 struct iscsi_cls_session
*cls_session
;
833 struct iscsi_session
*session
;
834 struct iscsi_sw_tcp_host
*tcp_sw_host
;
835 struct Scsi_Host
*shost
;
838 printk(KERN_ERR
"iscsi_tcp: invalid ep %p.\n", ep
);
842 shost
= iscsi_host_alloc(&iscsi_sw_tcp_sht
,
843 sizeof(struct iscsi_sw_tcp_host
), 1);
846 shost
->transportt
= iscsi_sw_tcp_scsi_transport
;
847 shost
->cmd_per_lun
= qdepth
;
848 shost
->max_lun
= iscsi_max_lun
;
850 shost
->max_channel
= 0;
851 shost
->max_cmd_len
= SCSI_MAX_VARLEN_CDB_SIZE
;
853 if (iscsi_host_add(shost
, NULL
))
856 cls_session
= iscsi_session_setup(&iscsi_sw_tcp_transport
, shost
,
858 sizeof(struct iscsi_tcp_task
) +
859 sizeof(struct iscsi_sw_tcp_hdrbuf
),
863 session
= cls_session
->dd_data
;
864 tcp_sw_host
= iscsi_host_priv(shost
);
865 tcp_sw_host
->session
= session
;
867 shost
->can_queue
= session
->scsi_cmds_max
;
868 if (iscsi_tcp_r2tpool_alloc(session
))
873 iscsi_session_teardown(cls_session
);
875 iscsi_host_remove(shost
);
877 iscsi_host_free(shost
);
881 static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session
*cls_session
)
883 struct Scsi_Host
*shost
= iscsi_session_to_shost(cls_session
);
885 iscsi_tcp_r2tpool_free(cls_session
->dd_data
);
886 iscsi_session_teardown(cls_session
);
888 iscsi_host_remove(shost
);
889 iscsi_host_free(shost
);
892 static umode_t
iscsi_sw_tcp_attr_is_visible(int param_type
, int param
)
894 switch (param_type
) {
895 case ISCSI_HOST_PARAM
:
897 case ISCSI_HOST_PARAM_NETDEV_NAME
:
898 case ISCSI_HOST_PARAM_HWADDRESS
:
899 case ISCSI_HOST_PARAM_IPADDRESS
:
900 case ISCSI_HOST_PARAM_INITIATOR_NAME
:
907 case ISCSI_PARAM_MAX_RECV_DLENGTH
:
908 case ISCSI_PARAM_MAX_XMIT_DLENGTH
:
909 case ISCSI_PARAM_HDRDGST_EN
:
910 case ISCSI_PARAM_DATADGST_EN
:
911 case ISCSI_PARAM_CONN_ADDRESS
:
912 case ISCSI_PARAM_CONN_PORT
:
913 case ISCSI_PARAM_LOCAL_PORT
:
914 case ISCSI_PARAM_EXP_STATSN
:
915 case ISCSI_PARAM_PERSISTENT_ADDRESS
:
916 case ISCSI_PARAM_PERSISTENT_PORT
:
917 case ISCSI_PARAM_PING_TMO
:
918 case ISCSI_PARAM_RECV_TMO
:
919 case ISCSI_PARAM_INITIAL_R2T_EN
:
920 case ISCSI_PARAM_MAX_R2T
:
921 case ISCSI_PARAM_IMM_DATA_EN
:
922 case ISCSI_PARAM_FIRST_BURST
:
923 case ISCSI_PARAM_MAX_BURST
:
924 case ISCSI_PARAM_PDU_INORDER_EN
:
925 case ISCSI_PARAM_DATASEQ_INORDER_EN
:
926 case ISCSI_PARAM_ERL
:
927 case ISCSI_PARAM_TARGET_NAME
:
928 case ISCSI_PARAM_TPGT
:
929 case ISCSI_PARAM_USERNAME
:
930 case ISCSI_PARAM_PASSWORD
:
931 case ISCSI_PARAM_USERNAME_IN
:
932 case ISCSI_PARAM_PASSWORD_IN
:
933 case ISCSI_PARAM_FAST_ABORT
:
934 case ISCSI_PARAM_ABORT_TMO
:
935 case ISCSI_PARAM_LU_RESET_TMO
:
936 case ISCSI_PARAM_TGT_RESET_TMO
:
937 case ISCSI_PARAM_IFACE_NAME
:
938 case ISCSI_PARAM_INITIATOR_NAME
:
948 static int iscsi_sw_tcp_slave_alloc(struct scsi_device
*sdev
)
950 set_bit(QUEUE_FLAG_BIDI
, &sdev
->request_queue
->queue_flags
);
954 static int iscsi_sw_tcp_slave_configure(struct scsi_device
*sdev
)
956 blk_queue_bounce_limit(sdev
->request_queue
, BLK_BOUNCE_ANY
);
957 blk_queue_dma_alignment(sdev
->request_queue
, 0);
961 static struct scsi_host_template iscsi_sw_tcp_sht
= {
962 .module
= THIS_MODULE
,
963 .name
= "iSCSI Initiator over TCP/IP",
964 .queuecommand
= iscsi_queuecommand
,
965 .change_queue_depth
= scsi_change_queue_depth
,
966 .can_queue
= ISCSI_DEF_XMIT_CMDS_MAX
- 1,
967 .sg_tablesize
= 4096,
968 .max_sectors
= 0xFFFF,
969 .cmd_per_lun
= ISCSI_DEF_CMD_PER_LUN
,
970 .eh_timed_out
= iscsi_eh_cmd_timed_out
,
971 .eh_abort_handler
= iscsi_eh_abort
,
972 .eh_device_reset_handler
= iscsi_eh_device_reset
,
973 .eh_target_reset_handler
= iscsi_eh_recover_target
,
974 .use_clustering
= DISABLE_CLUSTERING
,
975 .slave_alloc
= iscsi_sw_tcp_slave_alloc
,
976 .slave_configure
= iscsi_sw_tcp_slave_configure
,
977 .target_alloc
= iscsi_target_alloc
,
978 .proc_name
= "iscsi_tcp",
980 .track_queue_depth
= 1,
983 static struct iscsi_transport iscsi_sw_tcp_transport
= {
984 .owner
= THIS_MODULE
,
986 .caps
= CAP_RECOVERY_L0
| CAP_MULTI_R2T
| CAP_HDRDGST
988 /* session management */
989 .create_session
= iscsi_sw_tcp_session_create
,
990 .destroy_session
= iscsi_sw_tcp_session_destroy
,
991 /* connection management */
992 .create_conn
= iscsi_sw_tcp_conn_create
,
993 .bind_conn
= iscsi_sw_tcp_conn_bind
,
994 .destroy_conn
= iscsi_sw_tcp_conn_destroy
,
995 .attr_is_visible
= iscsi_sw_tcp_attr_is_visible
,
996 .set_param
= iscsi_sw_tcp_conn_set_param
,
997 .get_conn_param
= iscsi_sw_tcp_conn_get_param
,
998 .get_session_param
= iscsi_session_get_param
,
999 .start_conn
= iscsi_conn_start
,
1000 .stop_conn
= iscsi_sw_tcp_conn_stop
,
1001 /* iscsi host params */
1002 .get_host_param
= iscsi_sw_tcp_host_get_param
,
1003 .set_host_param
= iscsi_host_set_param
,
1005 .send_pdu
= iscsi_conn_send_pdu
,
1006 .get_stats
= iscsi_sw_tcp_conn_get_stats
,
1007 /* iscsi task/cmd helpers */
1008 .init_task
= iscsi_tcp_task_init
,
1009 .xmit_task
= iscsi_tcp_task_xmit
,
1010 .cleanup_task
= iscsi_tcp_cleanup_task
,
1011 /* low level pdu helpers */
1012 .xmit_pdu
= iscsi_sw_tcp_pdu_xmit
,
1013 .init_pdu
= iscsi_sw_tcp_pdu_init
,
1014 .alloc_pdu
= iscsi_sw_tcp_pdu_alloc
,
1016 .session_recovery_timedout
= iscsi_session_recovery_timedout
,
1019 static int __init
iscsi_sw_tcp_init(void)
1021 if (iscsi_max_lun
< 1) {
1022 printk(KERN_ERR
"iscsi_tcp: Invalid max_lun value of %u\n",
1027 iscsi_sw_tcp_scsi_transport
= iscsi_register_transport(
1028 &iscsi_sw_tcp_transport
);
1029 if (!iscsi_sw_tcp_scsi_transport
)
1035 static void __exit
iscsi_sw_tcp_exit(void)
1037 iscsi_unregister_transport(&iscsi_sw_tcp_transport
);
1040 module_init(iscsi_sw_tcp_init
);
1041 module_exit(iscsi_sw_tcp_exit
);