/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * 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 version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lnet/include/lnet/socklnd.h
 *
 * #defines shared between socknal implementation and utilities
 */
#ifndef __LNET_LNET_SOCKLND_H__
#define __LNET_LNET_SOCKLND_H__

#include <linux/lnet/types.h>
#include <linux/lnet/lib-types.h>

#define SOCKLND_CONN_NONE     (-1)
#define SOCKLND_CONN_ANY	0
#define SOCKLND_CONN_CONTROL    1
#define SOCKLND_CONN_BULK_IN    2
#define SOCKLND_CONN_BULK_OUT   3
#define SOCKLND_CONN_NTYPES     4

#define SOCKLND_CONN_ACK	SOCKLND_CONN_BULK_IN

typedef struct {
	__u32		   kshm_magic;     /* magic number of socklnd message */
	__u32		   kshm_version;   /* version of socklnd message */
	lnet_nid_t	      kshm_src_nid;   /* sender's nid */
	lnet_nid_t	      kshm_dst_nid;   /* destination nid */
	lnet_pid_t	      kshm_src_pid;   /* sender's pid */
	lnet_pid_t	      kshm_dst_pid;   /* destination pid */
	__u64		   kshm_src_incarnation; /* sender's incarnation */
	__u64		   kshm_dst_incarnation; /* destination's incarnation */
	__u32		   kshm_ctype;     /* connection type */
	__u32		   kshm_nips;      /* # IP addrs */
	__u32		   kshm_ips[0];    /* IP addrs */
} WIRE_ATTR ksock_hello_msg_t;

typedef struct {
	lnet_hdr_t	      ksnm_hdr;       /* lnet hdr */

	/*
	 * ksnm_payload is removed because of winnt compiler's limitation:
	 * zero-sized array can only be placed at the tail of [nested]
	 * structure definitions. lnet payload will be stored just after
	 * the body of structure ksock_lnet_msg_t
	 */
} WIRE_ATTR ksock_lnet_msg_t;

typedef struct {
	__u32		   ksm_type;       /* type of socklnd message */
	__u32		   ksm_csum;       /* checksum if != 0 */
	__u64		   ksm_zc_cookies[2]; /* Zero-Copy request/ACK cookie */
	union {
		ksock_lnet_msg_t lnetmsg;       /* lnet message, it's empty if it's NOOP */
	} WIRE_ATTR ksm_u;
} WIRE_ATTR ksock_msg_t;

static inline void
socklnd_init_msg(ksock_msg_t *msg, int type)
{
	msg->ksm_csum	   = 0;
	msg->ksm_type	   = type;
	msg->ksm_zc_cookies[0]  = msg->ksm_zc_cookies[1]  = 0;
}

#define KSOCK_MSG_NOOP	  0xc0	    /* ksm_u empty */
#define KSOCK_MSG_LNET	  0xc1	    /* lnet msg */

/* We need to know this number to parse hello msg from ksocklnd in
 * other LND (usocklnd, for example) */
#define KSOCK_PROTO_V2	  2
#define KSOCK_PROTO_V3	  3

#endif