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 
32 	struct iscsi_sw_tcp_send out;
33 	/* old values for socket callbacks */
34 	void			(*old_data_ready)(struct sock *);
35 	void			(*old_state_change)(struct sock *);
36 	void			(*old_write_space)(struct sock *);
37 
38 	/* data and header digests */
39 	struct ahash_request	*tx_hash;	/* CRC32C (Tx) */
40 	struct ahash_request	*rx_hash;	/* CRC32C (Rx) */
41 
42 	/* MIB custom statistics */
43 	uint32_t		sendpage_failures_cnt;
44 	uint32_t		discontiguous_hdr_cnt;
45 
46 	ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
47 };
48 
49 struct iscsi_sw_tcp_host {
50 	struct iscsi_session	*session;
51 };
52 
53 struct iscsi_sw_tcp_hdrbuf {
54 	struct iscsi_hdr	hdrbuf;
55 	char			hdrextbuf[ISCSI_MAX_AHS_SIZE +
56 		                                  ISCSI_DIGEST_SIZE];
57 };
58 
59 #endif /* ISCSI_SW_TCP_H */
60