xref: /openbmc/linux/drivers/scsi/iscsi_tcp.h (revision fa8df343)
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * iSCSI Initiator TCP Transport
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
9  *
10  * See the file COPYING included with this distribution for more details.
11  */
12 
13 #ifndef ISCSI_SW_TCP_H
14 #define ISCSI_SW_TCP_H
15 
16 #include <scsi/libiscsi.h>
17 #include <scsi/libiscsi_tcp.h>
18 
19 struct socket;
20 struct iscsi_tcp_conn;
21 
22 /* Socket connection send helper */
23 struct iscsi_sw_tcp_send {
24 	struct iscsi_hdr	*hdr;
25 	struct iscsi_segment	segment;
26 	struct iscsi_segment	data_segment;
27 };
28 
29 struct iscsi_sw_tcp_conn {
30 	struct socket		*sock;
31 	/* Taken when accessing the sock from the netlink/sysfs interface */
32 	struct mutex		sock_lock;
33 
34 	struct work_struct	recvwork;
35 	bool			queue_recv;
36 
37 	struct iscsi_sw_tcp_send out;
38 	/* old values for socket callbacks */
39 	void			(*old_data_ready)(struct sock *);
40 	void			(*old_state_change)(struct sock *);
41 	void			(*old_write_space)(struct sock *);
42 
43 	/* data and header digests */
44 	struct ahash_request	*tx_hash;	/* CRC32C (Tx) */
45 	struct ahash_request	*rx_hash;	/* CRC32C (Rx) */
46 
47 	/* MIB custom statistics */
48 	uint32_t		sendpage_failures_cnt;
49 	uint32_t		discontiguous_hdr_cnt;
50 };
51 
52 struct iscsi_sw_tcp_host {
53 	struct iscsi_session	*session;
54 };
55 
56 struct iscsi_sw_tcp_hdrbuf {
57 	struct iscsi_hdr	hdrbuf;
58 	char			hdrextbuf[ISCSI_MAX_AHS_SIZE +
59 		                                  ISCSI_DIGEST_SIZE];
60 };
61 
62 #endif /* ISCSI_SW_TCP_H */
63