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
19struct socket;
20struct iscsi_tcp_conn;
21
22/* Socket connection send helper */
23struct iscsi_sw_tcp_send {
24	struct iscsi_hdr	*hdr;
25	struct iscsi_segment	segment;
26	struct iscsi_segment	data_segment;
27};
28
29struct 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 iscsi_sw_tcp_send out;
35	/* old values for socket callbacks */
36	void			(*old_data_ready)(struct sock *);
37	void			(*old_state_change)(struct sock *);
38	void			(*old_write_space)(struct sock *);
39
40	/* data and header digests */
41	struct ahash_request	*tx_hash;	/* CRC32C (Tx) */
42	struct ahash_request	*rx_hash;	/* CRC32C (Rx) */
43
44	/* MIB custom statistics */
45	uint32_t		sendpage_failures_cnt;
46	uint32_t		discontiguous_hdr_cnt;
47
48	ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
49};
50
51struct iscsi_sw_tcp_host {
52	struct iscsi_session	*session;
53};
54
55struct iscsi_sw_tcp_hdrbuf {
56	struct iscsi_hdr	hdrbuf;
57	char			hdrextbuf[ISCSI_MAX_AHS_SIZE +
58		                                  ISCSI_DIGEST_SIZE];
59};
60
61#endif /* ISCSI_SW_TCP_H */
62