[deliverable/linux.git] / drivers / scsi / iscsi_tcp.h

/*
 * iSCSI Initiator TCP Transport
 * Copyright (C) 2004 Dmitry Yusupov
 * Copyright (C) 2004 Alex Aizman
 * Copyright (C) 2005 - 2006 Mike Christie
 * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
 * maintained by open-iscsi@googlegroups.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * See the file COPYING included with this distribution for more details.
 */

#ifndef ISCSI_SW_TCP_H
#define ISCSI_SW_TCP_H

#include <scsi/libiscsi.h>
#include <scsi/libiscsi_tcp.h>

struct socket;
struct iscsi_tcp_conn;

/* Socket connection send helper */
struct iscsi_sw_tcp_send {
	struct iscsi_hdr	*hdr;
	struct iscsi_segment	segment;
	struct iscsi_segment	data_segment;
};

struct iscsi_sw_tcp_conn {
	struct socket		*sock;

	struct iscsi_sw_tcp_send out;
	/* old values for socket callbacks */
	void			(*old_data_ready)(struct sock *);
	void			(*old_state_change)(struct sock *);
	void			(*old_write_space)(struct sock *);

	/* data and header digests */
	struct hash_desc	tx_hash;	/* CRC32C (Tx) */
	struct hash_desc	rx_hash;	/* CRC32C (Rx) */

	/* MIB custom statistics */
	uint32_t		sendpage_failures_cnt;
	uint32_t		discontiguous_hdr_cnt;

	ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
};

struct iscsi_sw_tcp_host {
	struct iscsi_session	*session;
};

struct iscsi_sw_tcp_hdrbuf {
	struct iscsi_hdr	hdrbuf;
	char			hdrextbuf[ISCSI_MAX_AHS_SIZE +
		                                  ISCSI_DIGEST_SIZE];
};

#endif /* ISCSI_SW_TCP_H */
Commit	Line	Data
	1	/*
	2	* iSCSI Initiator TCP Transport
	3	* Copyright (C) 2004 Dmitry Yusupov
	4	* Copyright (C) 2004 Alex Aizman
	5	* Copyright (C) 2005 - 2006 Mike Christie
	6	* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
	7	* maintained by open-iscsi@googlegroups.com
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published
	11	* by the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* See the file COPYING included with this distribution for more details.
	20	*/
	21
	22	#ifndef ISCSI_SW_TCP_H
	23	#define ISCSI_SW_TCP_H
	24
	25	#include <scsi/libiscsi.h>
	26	#include <scsi/libiscsi_tcp.h>
	27
	28	struct socket;
	29	struct iscsi_tcp_conn;
	30
	31	/* Socket connection send helper */
	32	struct iscsi_sw_tcp_send {
	33	struct iscsi_hdr *hdr;
	34	struct iscsi_segment segment;
	35	struct iscsi_segment data_segment;
	36	};
	37
	38	struct iscsi_sw_tcp_conn {
	39	struct socket *sock;
	40
	41	struct iscsi_sw_tcp_send out;
	42	/* old values for socket callbacks */
	43	void (old_data_ready)(struct sock );
	44	void (old_state_change)(struct sock );
	45	void (old_write_space)(struct sock );
	46
	47	/* data and header digests */
	48	struct hash_desc tx_hash; /* CRC32C (Tx) */
	49	struct hash_desc rx_hash; /* CRC32C (Rx) */
	50
	51	/* MIB custom statistics */
	52	uint32_t sendpage_failures_cnt;
	53	uint32_t discontiguous_hdr_cnt;
	54
	55	ssize_t (sendpage)(struct socket , struct page *, int, size_t, int);
	56	};
	57
	58	struct iscsi_sw_tcp_host {
	59	struct iscsi_session *session;
	60	};
	61
	62	struct iscsi_sw_tcp_hdrbuf {
	63	struct iscsi_hdr hdrbuf;
	64	char hdrextbuf[ISCSI_MAX_AHS_SIZE +
	65	ISCSI_DIGEST_SIZE];
	66	};
	67
	68	#endif /* ISCSI_SW_TCP_H */