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/sched/mm.h>
34 #include <linux/file.h>
35 #include <linux/blkdev.h>
36 #include <linux/delay.h>
37 #include <linux/kfifo.h>
38 #include <linux/scatterlist.h>
39 #include <linux/module.h>
40 #include <linux/backing-dev.h>
42 #include <scsi/scsi_cmnd.h>
43 #include <scsi/scsi_device.h>
44 #include <scsi/scsi_host.h>
45 #include <scsi/scsi.h>
46 #include <scsi/scsi_transport_iscsi.h>
48 #include "iscsi_tcp.h"
50 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
51 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
52 "Alex Aizman <itn780@yahoo.com>");
53 MODULE_DESCRIPTION("iSCSI/TCP data-path");
54 MODULE_LICENSE("GPL");
56 static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
57 static struct scsi_host_template iscsi_sw_tcp_sht;
58 static struct iscsi_transport iscsi_sw_tcp_transport;
60 static unsigned int iscsi_max_lun = ~0;
61 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
63 static int iscsi_sw_tcp_dbg;
64 module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
66 MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
67 "Set to 1 to turn on, and zero to turn off. Default is off.");
69 #define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
71 if (iscsi_sw_tcp_dbg) \
72 iscsi_conn_printk(KERN_INFO, _conn, \
79 * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
80 * @rd_desc: read descriptor
82 * @offset: offset in skb
83 * @len: skb->len - offset
85 static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
86 unsigned int offset, size_t len)
88 struct iscsi_conn *conn = rd_desc->arg.data;
89 unsigned int consumed, total_consumed = 0;
92 ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
96 consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
98 total_consumed += consumed;
99 } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
101 ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
102 skb->len - offset, status);
103 return total_consumed;
107 * iscsi_sw_sk_state_check - check socket state
110 * If the socket is in CLOSE or CLOSE_WAIT we should
111 * not close the connection if there is still some
114 * Must be called with sk_callback_lock.
116 static inline int iscsi_sw_sk_state_check(struct sock *sk)
118 struct iscsi_conn *conn = sk->sk_user_data;
120 if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
121 (conn->session->state != ISCSI_STATE_LOGGING_OUT) &&
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);
130 static void iscsi_sw_tcp_data_ready(struct sock *sk)
132 struct iscsi_conn *conn;
133 struct iscsi_tcp_conn *tcp_conn;
134 read_descriptor_t rd_desc;
136 read_lock_bh(&sk->sk_callback_lock);
137 conn = sk->sk_user_data;
139 read_unlock_bh(&sk->sk_callback_lock);
142 tcp_conn = conn->dd_data;
145 * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
146 * We set count to 1 because we want the network layer to
147 * hand us all the skbs that are available. iscsi_tcp_recv
148 * handled pdus that cross buffers or pdus that still need data.
150 rd_desc.arg.data = conn;
152 tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
154 iscsi_sw_sk_state_check(sk);
156 /* If we had to (atomically) map a highmem page,
158 iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
159 read_unlock_bh(&sk->sk_callback_lock);
162 static void iscsi_sw_tcp_state_change(struct sock *sk)
164 struct iscsi_tcp_conn *tcp_conn;
165 struct iscsi_sw_tcp_conn *tcp_sw_conn;
166 struct iscsi_conn *conn;
167 void (*old_state_change)(struct sock *);
169 read_lock_bh(&sk->sk_callback_lock);
170 conn = sk->sk_user_data;
172 read_unlock_bh(&sk->sk_callback_lock);
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 int noreclaim_flag;
375 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
376 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
379 if (!tcp_sw_conn->sock) {
380 iscsi_conn_printk(KERN_ERR, conn,
381 "Transport not bound to socket!\n");
385 noreclaim_flag = memalloc_noreclaim_save();
387 while (iscsi_sw_tcp_xmit_qlen(conn)) {
388 rc = iscsi_sw_tcp_xmit(conn);
398 memalloc_noreclaim_restore(noreclaim_flag);
403 * This is called when we're done sending the header.
404 * Simply copy the data_segment to the send segment, and return.
406 static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
407 struct iscsi_segment *segment)
409 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
411 tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
412 ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
413 "Header done. Next segment size %u total_size %u\n",
414 tcp_sw_conn->out.segment.size,
415 tcp_sw_conn->out.segment.total_size);
419 static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
422 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
423 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
425 ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
426 "digest enabled" : "digest disabled");
428 /* Clear the data segment - needs to be filled in by the
429 * caller using iscsi_tcp_send_data_prep() */
430 memset(&tcp_sw_conn->out.data_segment, 0,
431 sizeof(struct iscsi_segment));
433 /* If header digest is enabled, compute the CRC and
434 * place the digest into the same buffer. We make
435 * sure that both iscsi_tcp_task and mtask have
438 if (conn->hdrdgst_en) {
439 iscsi_tcp_dgst_header(tcp_sw_conn->tx_hash, hdr, hdrlen,
441 hdrlen += ISCSI_DIGEST_SIZE;
444 /* Remember header pointer for later, when we need
445 * to decide whether there's a payload to go along
446 * with the header. */
447 tcp_sw_conn->out.hdr = hdr;
449 iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
450 iscsi_sw_tcp_send_hdr_done, NULL);
454 * Prepare the send buffer for the payload data.
455 * Padding and checksumming will all be taken care
456 * of by the iscsi_segment routines.
459 iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
460 unsigned int count, unsigned int offset,
463 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
464 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
465 struct ahash_request *tx_hash = NULL;
466 unsigned int hdr_spec_len;
468 ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
470 "digest enabled" : "digest disabled");
472 /* Make sure the datalen matches what the caller
473 said he would send. */
474 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
475 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
477 if (conn->datadgst_en)
478 tx_hash = tcp_sw_conn->tx_hash;
480 return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
481 sg, count, offset, len,
486 iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
489 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
490 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
491 struct ahash_request *tx_hash = NULL;
492 unsigned int hdr_spec_len;
494 ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
495 "digest enabled" : "digest disabled");
497 /* Make sure the datalen matches what the caller
498 said he would send. */
499 hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
500 WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
502 if (conn->datadgst_en)
503 tx_hash = tcp_sw_conn->tx_hash;
505 iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
506 data, len, NULL, tx_hash);
509 static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
510 unsigned int offset, unsigned int count)
512 struct iscsi_conn *conn = task->conn;
515 iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
521 iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
523 struct scsi_data_buffer *sdb = scsi_out(task->sc);
525 err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
526 sdb->table.nents, offset,
531 /* got invalid offset/len */
537 static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
539 struct iscsi_tcp_task *tcp_task = task->dd_data;
541 task->hdr = task->dd_data + sizeof(*tcp_task);
542 task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
546 static struct iscsi_cls_conn *
547 iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
550 struct iscsi_conn *conn;
551 struct iscsi_cls_conn *cls_conn;
552 struct iscsi_tcp_conn *tcp_conn;
553 struct iscsi_sw_tcp_conn *tcp_sw_conn;
554 struct crypto_ahash *tfm;
556 cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
560 conn = cls_conn->dd_data;
561 tcp_conn = conn->dd_data;
562 tcp_sw_conn = tcp_conn->dd_data;
564 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
568 tcp_sw_conn->tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
569 if (!tcp_sw_conn->tx_hash)
571 ahash_request_set_callback(tcp_sw_conn->tx_hash, 0, NULL, NULL);
573 tcp_sw_conn->rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
574 if (!tcp_sw_conn->rx_hash)
576 ahash_request_set_callback(tcp_sw_conn->rx_hash, 0, NULL, NULL);
578 tcp_conn->rx_hash = tcp_sw_conn->rx_hash;
583 ahash_request_free(tcp_sw_conn->tx_hash);
585 crypto_free_ahash(tfm);
587 iscsi_conn_printk(KERN_ERR, conn,
588 "Could not create connection due to crc32c "
589 "loading error. Make sure the crc32c "
590 "module is built as a module or into the "
592 iscsi_tcp_conn_teardown(cls_conn);
596 static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
598 struct iscsi_session *session = conn->session;
599 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
600 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
601 struct socket *sock = tcp_sw_conn->sock;
607 iscsi_sw_tcp_conn_restore_callbacks(conn);
610 spin_lock_bh(&session->frwd_lock);
611 tcp_sw_conn->sock = NULL;
612 spin_unlock_bh(&session->frwd_lock);
616 static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
618 struct iscsi_conn *conn = cls_conn->dd_data;
619 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
620 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
622 iscsi_sw_tcp_release_conn(conn);
624 ahash_request_free(tcp_sw_conn->rx_hash);
625 if (tcp_sw_conn->tx_hash) {
626 struct crypto_ahash *tfm;
628 tfm = crypto_ahash_reqtfm(tcp_sw_conn->tx_hash);
629 ahash_request_free(tcp_sw_conn->tx_hash);
630 crypto_free_ahash(tfm);
633 iscsi_tcp_conn_teardown(cls_conn);
636 static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
638 struct iscsi_conn *conn = cls_conn->dd_data;
639 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
640 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
641 struct socket *sock = tcp_sw_conn->sock;
643 /* userspace may have goofed up and not bound us */
647 sock->sk->sk_err = EIO;
648 wake_up_interruptible(sk_sleep(sock->sk));
651 iscsi_suspend_tx(conn);
653 /* stop recv side and release socket */
654 iscsi_sw_tcp_release_conn(conn);
656 iscsi_conn_stop(cls_conn, flag);
660 iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
661 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
664 struct iscsi_session *session = cls_session->dd_data;
665 struct iscsi_conn *conn = cls_conn->dd_data;
666 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
667 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
672 /* lookup for existing socket */
673 sock = sockfd_lookup((int)transport_eph, &err);
675 iscsi_conn_printk(KERN_ERR, conn,
676 "sockfd_lookup failed %d\n", err);
680 err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
684 spin_lock_bh(&session->frwd_lock);
685 /* bind iSCSI connection and socket */
686 tcp_sw_conn->sock = sock;
687 spin_unlock_bh(&session->frwd_lock);
689 /* setup Socket parameters */
691 sk->sk_reuse = SK_CAN_REUSE;
692 sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
693 sk->sk_allocation = GFP_ATOMIC;
696 iscsi_sw_tcp_conn_set_callbacks(conn);
697 tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
699 * set receive state machine into initial state
701 iscsi_tcp_hdr_recv_prep(tcp_conn);
709 static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
710 enum iscsi_param param, char *buf,
713 struct iscsi_conn *conn = cls_conn->dd_data;
714 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
715 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
718 case ISCSI_PARAM_HDRDGST_EN:
719 iscsi_set_param(cls_conn, param, buf, buflen);
721 case ISCSI_PARAM_DATADGST_EN:
722 iscsi_set_param(cls_conn, param, buf, buflen);
723 tcp_sw_conn->sendpage = conn->datadgst_en ?
724 sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
726 case ISCSI_PARAM_MAX_R2T:
727 return iscsi_tcp_set_max_r2t(conn, buf);
729 return iscsi_set_param(cls_conn, param, buf, buflen);
735 static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
736 enum iscsi_param param, char *buf)
738 struct iscsi_conn *conn = cls_conn->dd_data;
739 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
740 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
741 struct sockaddr_in6 addr;
745 case ISCSI_PARAM_CONN_PORT:
746 case ISCSI_PARAM_CONN_ADDRESS:
747 case ISCSI_PARAM_LOCAL_PORT:
748 spin_lock_bh(&conn->session->frwd_lock);
749 if (!tcp_sw_conn || !tcp_sw_conn->sock) {
750 spin_unlock_bh(&conn->session->frwd_lock);
753 if (param == ISCSI_PARAM_LOCAL_PORT)
754 rc = kernel_getsockname(tcp_sw_conn->sock,
755 (struct sockaddr *)&addr, &len);
757 rc = kernel_getpeername(tcp_sw_conn->sock,
758 (struct sockaddr *)&addr, &len);
759 spin_unlock_bh(&conn->session->frwd_lock);
763 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
766 return iscsi_conn_get_param(cls_conn, param, buf);
772 static int iscsi_sw_tcp_host_get_param(struct Scsi_Host *shost,
773 enum iscsi_host_param param, char *buf)
775 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(shost);
776 struct iscsi_session *session = tcp_sw_host->session;
777 struct iscsi_conn *conn;
778 struct iscsi_tcp_conn *tcp_conn;
779 struct iscsi_sw_tcp_conn *tcp_sw_conn;
780 struct sockaddr_in6 addr;
784 case ISCSI_HOST_PARAM_IPADDRESS:
788 spin_lock_bh(&session->frwd_lock);
789 conn = session->leadconn;
791 spin_unlock_bh(&session->frwd_lock);
794 tcp_conn = conn->dd_data;
796 tcp_sw_conn = tcp_conn->dd_data;
797 if (!tcp_sw_conn->sock) {
798 spin_unlock_bh(&session->frwd_lock);
802 rc = kernel_getsockname(tcp_sw_conn->sock,
803 (struct sockaddr *)&addr, &len);
804 spin_unlock_bh(&session->frwd_lock);
808 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
810 (enum iscsi_param)param, buf);
812 return iscsi_host_get_param(shost, param, buf);
819 iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
820 struct iscsi_stats *stats)
822 struct iscsi_conn *conn = cls_conn->dd_data;
823 struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
824 struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
826 stats->custom_length = 3;
827 strcpy(stats->custom[0].desc, "tx_sendpage_failures");
828 stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
829 strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
830 stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
831 strcpy(stats->custom[2].desc, "eh_abort_cnt");
832 stats->custom[2].value = conn->eh_abort_cnt;
834 iscsi_tcp_conn_get_stats(cls_conn, stats);
837 static struct iscsi_cls_session *
838 iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
839 uint16_t qdepth, uint32_t initial_cmdsn)
841 struct iscsi_cls_session *cls_session;
842 struct iscsi_session *session;
843 struct iscsi_sw_tcp_host *tcp_sw_host;
844 struct Scsi_Host *shost;
847 printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
851 shost = iscsi_host_alloc(&iscsi_sw_tcp_sht,
852 sizeof(struct iscsi_sw_tcp_host), 1);
855 shost->transportt = iscsi_sw_tcp_scsi_transport;
856 shost->cmd_per_lun = qdepth;
857 shost->max_lun = iscsi_max_lun;
859 shost->max_channel = 0;
860 shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
862 if (iscsi_host_add(shost, NULL))
865 cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
867 sizeof(struct iscsi_tcp_task) +
868 sizeof(struct iscsi_sw_tcp_hdrbuf),
872 session = cls_session->dd_data;
873 tcp_sw_host = iscsi_host_priv(shost);
874 tcp_sw_host->session = session;
876 shost->can_queue = session->scsi_cmds_max;
877 if (iscsi_tcp_r2tpool_alloc(session))
882 iscsi_session_teardown(cls_session);
884 iscsi_host_remove(shost);
886 iscsi_host_free(shost);
890 static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
892 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
893 struct iscsi_session *session = cls_session->dd_data;
895 if (WARN_ON_ONCE(session->leadconn))
898 iscsi_tcp_r2tpool_free(cls_session->dd_data);
899 iscsi_session_teardown(cls_session);
901 iscsi_host_remove(shost);
902 iscsi_host_free(shost);
905 static umode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
907 switch (param_type) {
908 case ISCSI_HOST_PARAM:
910 case ISCSI_HOST_PARAM_NETDEV_NAME:
911 case ISCSI_HOST_PARAM_HWADDRESS:
912 case ISCSI_HOST_PARAM_IPADDRESS:
913 case ISCSI_HOST_PARAM_INITIATOR_NAME:
920 case ISCSI_PARAM_MAX_RECV_DLENGTH:
921 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
922 case ISCSI_PARAM_HDRDGST_EN:
923 case ISCSI_PARAM_DATADGST_EN:
924 case ISCSI_PARAM_CONN_ADDRESS:
925 case ISCSI_PARAM_CONN_PORT:
926 case ISCSI_PARAM_LOCAL_PORT:
927 case ISCSI_PARAM_EXP_STATSN:
928 case ISCSI_PARAM_PERSISTENT_ADDRESS:
929 case ISCSI_PARAM_PERSISTENT_PORT:
930 case ISCSI_PARAM_PING_TMO:
931 case ISCSI_PARAM_RECV_TMO:
932 case ISCSI_PARAM_INITIAL_R2T_EN:
933 case ISCSI_PARAM_MAX_R2T:
934 case ISCSI_PARAM_IMM_DATA_EN:
935 case ISCSI_PARAM_FIRST_BURST:
936 case ISCSI_PARAM_MAX_BURST:
937 case ISCSI_PARAM_PDU_INORDER_EN:
938 case ISCSI_PARAM_DATASEQ_INORDER_EN:
939 case ISCSI_PARAM_ERL:
940 case ISCSI_PARAM_TARGET_NAME:
941 case ISCSI_PARAM_TPGT:
942 case ISCSI_PARAM_USERNAME:
943 case ISCSI_PARAM_PASSWORD:
944 case ISCSI_PARAM_USERNAME_IN:
945 case ISCSI_PARAM_PASSWORD_IN:
946 case ISCSI_PARAM_FAST_ABORT:
947 case ISCSI_PARAM_ABORT_TMO:
948 case ISCSI_PARAM_LU_RESET_TMO:
949 case ISCSI_PARAM_TGT_RESET_TMO:
950 case ISCSI_PARAM_IFACE_NAME:
951 case ISCSI_PARAM_INITIATOR_NAME:
961 static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
963 set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
967 static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
969 struct iscsi_sw_tcp_host *tcp_sw_host = iscsi_host_priv(sdev->host);
970 struct iscsi_session *session = tcp_sw_host->session;
971 struct iscsi_conn *conn = session->leadconn;
973 if (conn->datadgst_en)
974 sdev->request_queue->backing_dev_info->capabilities
975 |= BDI_CAP_STABLE_WRITES;
976 blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
977 blk_queue_dma_alignment(sdev->request_queue, 0);
981 static struct scsi_host_template iscsi_sw_tcp_sht = {
982 .module = THIS_MODULE,
983 .name = "iSCSI Initiator over TCP/IP",
984 .queuecommand = iscsi_queuecommand,
985 .change_queue_depth = scsi_change_queue_depth,
986 .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
987 .sg_tablesize = 4096,
988 .max_sectors = 0xFFFF,
989 .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
990 .eh_timed_out = iscsi_eh_cmd_timed_out,
991 .eh_abort_handler = iscsi_eh_abort,
992 .eh_device_reset_handler= iscsi_eh_device_reset,
993 .eh_target_reset_handler = iscsi_eh_recover_target,
994 .use_clustering = DISABLE_CLUSTERING,
995 .slave_alloc = iscsi_sw_tcp_slave_alloc,
996 .slave_configure = iscsi_sw_tcp_slave_configure,
997 .target_alloc = iscsi_target_alloc,
998 .proc_name = "iscsi_tcp",
1000 .track_queue_depth = 1,
1003 static struct iscsi_transport iscsi_sw_tcp_transport = {
1004 .owner = THIS_MODULE,
1006 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
1008 /* session management */
1009 .create_session = iscsi_sw_tcp_session_create,
1010 .destroy_session = iscsi_sw_tcp_session_destroy,
1011 /* connection management */
1012 .create_conn = iscsi_sw_tcp_conn_create,
1013 .bind_conn = iscsi_sw_tcp_conn_bind,
1014 .destroy_conn = iscsi_sw_tcp_conn_destroy,
1015 .attr_is_visible = iscsi_sw_tcp_attr_is_visible,
1016 .set_param = iscsi_sw_tcp_conn_set_param,
1017 .get_conn_param = iscsi_sw_tcp_conn_get_param,
1018 .get_session_param = iscsi_session_get_param,
1019 .start_conn = iscsi_conn_start,
1020 .stop_conn = iscsi_sw_tcp_conn_stop,
1021 /* iscsi host params */
1022 .get_host_param = iscsi_sw_tcp_host_get_param,
1023 .set_host_param = iscsi_host_set_param,
1025 .send_pdu = iscsi_conn_send_pdu,
1026 .get_stats = iscsi_sw_tcp_conn_get_stats,
1027 /* iscsi task/cmd helpers */
1028 .init_task = iscsi_tcp_task_init,
1029 .xmit_task = iscsi_tcp_task_xmit,
1030 .cleanup_task = iscsi_tcp_cleanup_task,
1031 /* low level pdu helpers */
1032 .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
1033 .init_pdu = iscsi_sw_tcp_pdu_init,
1034 .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
1036 .session_recovery_timedout = iscsi_session_recovery_timedout,
1039 static int __init iscsi_sw_tcp_init(void)
1041 if (iscsi_max_lun < 1) {
1042 printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
1047 iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
1048 &iscsi_sw_tcp_transport);
1049 if (!iscsi_sw_tcp_scsi_transport)
1055 static void __exit iscsi_sw_tcp_exit(void)
1057 iscsi_unregister_transport(&iscsi_sw_tcp_transport);
1060 module_init(iscsi_sw_tcp_init);
1061 module_exit(iscsi_sw_tcp_exit);