/*
* SCSI Transport Netlink Interface
* Used for the posting of outbound SCSI transport events
*
* Copyright (C) 2006 James Smart, Emulex Corporation
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef SCSI_NETLINK_H
#define SCSI_NETLINK_H

#include <linux/netlink.h>
#include <linux/types.h>

/*
* This file intended to be included by both kernel and user space
*/

/* Single Netlink Message type to send all SCSI Transport messages */
#define SCSI_TRANSPORT_MSG NLMSG_MIN_TYPE + 1

/* SCSI Transport Broadcast Groups */
/* leaving groups 0 and 1 unassigned */
#define SCSI_NL_GRP_FC_EVENTS (1<<2) /* Group 2 */
#define SCSI_NL_GRP_CNT 3


/* SCSI_TRANSPORT_MSG event message header */
struct scsi_nl_hdr {
uint8_t version;
uint8_t transport;
uint16_t magic;
uint16_t msgtype;
uint16_t msglen;
} __attribute__((aligned(sizeof(uint64_t))));

/* scsi_nl_hdr->version value */
#define SCSI_NL_VERSION 1

/* scsi_nl_hdr->magic value */
#define SCSI_NL_MAGIC 0xA1B2

/* scsi_nl_hdr->transport value */
#define SCSI_NL_TRANSPORT 0
#define SCSI_NL_TRANSPORT_FC 1
#define SCSI_NL_MAX_TRANSPORTS 2

/* Transport-based scsi_nl_hdr->msgtype values are defined in each transport */

/*
* GENERIC SCSI scsi_nl_hdr->msgtype Values
*/
/* kernel -> user */
#define SCSI_NL_SHOST_VENDOR 0x0001
/* user -> kernel */
/* SCSI_NL_SHOST_VENDOR msgtype is kernel->user and user->kernel */


/*
* Message Structures :
*/

/* macro to round up message lengths to 8byte boundary */
#define SCSI_NL_MSGALIGN(len) (((len) + 7) & ~7)


/*
* SCSI HOST Vendor Unique messages :
* SCSI_NL_SHOST_VENDOR
*
* Note: The Vendor Unique message payload will begin directly after
* this structure, with the length of the payload per vmsg_datalen.
*
* Note: When specifying vendor_id, be sure to read the Vendor Type and ID
* formatting requirements specified below
*/
struct scsi_nl_host_vendor_msg {
struct scsi_nl_hdr snlh; /* must be 1st element ! */
uint64_t vendor_id;
uint16_t host_no;
uint16_t vmsg_datalen;
} __attribute__((aligned(sizeof(uint64_t))));


/*
* Vendor ID:
* If transports post vendor-unique events, they must pass a well-known
* 32-bit vendor identifier. This identifier consists of 8 bits indicating
* the "type" of identifier contained, and 24 bits of id data.
*
* Identifiers for each type:
* PCI : ID data is the 16 bit PCI Registered Vendor ID
*/
#define SCSI_NL_VID_TYPE_SHIFT 56
#define SCSI_NL_VID_TYPE_MASK ((__u64)0xFF << SCSI_NL_VID_TYPE_SHIFT)
#define SCSI_NL_VID_TYPE_PCI ((__u64)0x01 << SCSI_NL_VID_TYPE_SHIFT)
#define SCSI_NL_VID_ID_MASK (~ SCSI_NL_VID_TYPE_MASK)


#define INIT_SCSI_NL_HDR(hdr, t, mtype, mlen) \
{ \
(hdr)->version = SCSI_NL_VERSION; \
(hdr)->transport = t; \
(hdr)->magic = SCSI_NL_MAGIC; \
(hdr)->msgtype = mtype; \
(hdr)->msglen = mlen; \
}

#endif /* SCSI_NETLINK_H */