path: root/include/scsi/osd_protocol.h

/*
 * osd_protocol.h - OSD T10 standard C definitions.
 *
 * Copyright (C) 2008 Panasas Inc.  All rights reserved.
 *
 * Authors:
 *   Boaz Harrosh <ooo@electrozaur.com>
 *   Benny Halevy <bhalevy@panasas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 *
 * This file contains types and constants that are defined by the protocol
 * Note: All names and symbols are taken from the OSD standard's text.
 */
#ifndef __OSD_PROTOCOL_H__
#define __OSD_PROTOCOL_H__

#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>

enum {
	OSDv1_ADDITIONAL_CDB_LENGTH = 192,
	OSDv1_TOTAL_CDB_LEN = OSDv1_ADDITIONAL_CDB_LENGTH + 8,
	OSDv1_CAP_LEN = 80,

	/* Latest supported version */
	OSDv2_ADDITIONAL_CDB_LENGTH = 228,
	OSD_ADDITIONAL_CDB_LENGTH =
		OSDv2_ADDITIONAL_CDB_LENGTH,
	OSD_TOTAL_CDB_LEN = OSD_ADDITIONAL_CDB_LENGTH + 8,
	OSD_CAP_LEN = 104,

	OSD_SYSTEMID_LEN = 20,
	OSDv1_CRYPTO_KEYID_SIZE = 20,
	OSDv2_CRYPTO_KEYID_SIZE = 32,
	OSD_CRYPTO_KEYID_SIZE = OSDv2_CRYPTO_KEYID_SIZE,
	OSD_CRYPTO_SEED_SIZE = 4,
	OSD_CRYPTO_NONCE_SIZE = 12,
	OSD_MAX_SENSE_LEN = 252, /* from SPC-3 */

	OSD_PARTITION_FIRST_ID = 0x10000,
	OSD_OBJECT_FIRST_ID = 0x10000,
};

/* (osd-r10 5.2.4)
 * osd2r03: 5.2.3 Caching control bits
 */
enum osd_options_byte {
	OSD_CDB_FUA = 0x08,	/* Force Unit Access */
	OSD_CDB_DPO = 0x10,	/* Disable Page Out */
};

/*
 * osd2r03: 5.2.5 Isolation.
 * First 3 bits, V2-only.
 * Also for attr 110h "default isolation method" at Root Information page
 */
enum osd_options_byte_isolation {
	OSD_ISOLATION_DEFAULT = 0,
	OSD_ISOLATION_NONE = 1,
	OSD_ISOLATION_STRICT = 2,
	OSD_ISOLATION_RANGE = 4,
	OSD_ISOLATION_FUNCTIONAL = 5,
	OSD_ISOLATION_VENDOR = 7,
};

/* (osd-r10: 6.7)
 * osd2r03: 6.8 FLUSH, FLUSH COLLECTION, FLUSH OSD, FLUSH PARTITION
 */
enum osd_options_flush_scope_values {
	OSD_CDB_FLUSH_ALL = 0,
	OSD_CDB_FLUSH_ATTR_ONLY = 1,

	OSD_CDB_FLUSH_ALL_RECURSIVE = 2,
	/* V2-only */
	OSD_CDB_FLUSH_ALL_RANGE = 2,
};

/* osd2r03: 5.2.10 Timestamps control */
enum {
	OSD_CDB_NORMAL_TIMESTAMPS = 0,
	OSD_CDB_BYPASS_TIMESTAMPS = 0x7f,
};

/* (osd-r10: 5.2.2.1)
 * osd2r03: 5.2.4.1 Get and set attributes CDB format selection
 *	2 bits at second nibble of command_specific_options byte
 */
enum osd_attributes_mode {
	/* V2-only */
	OSD_CDB_SET_ONE_ATTR = 0x10,

	OSD_CDB_GET_ATTR_PAGE_SET_ONE = 0x20,
	OSD_CDB_GET_SET_ATTR_LISTS = 0x30,

	OSD_CDB_GET_SET_ATTR_MASK = 0x30,
};

/* (osd-r10: 4.12.5)
 * osd2r03: 4.14.5 Data-In and Data-Out buffer offsets
 *	byte offset = mantissa * (2^(exponent+8))
 *	struct {
 *		unsigned mantissa: 28;
 *		int exponent: 04;
 *	}
 */
typedef __be32 osd_cdb_offset;

enum {
	OSD_OFFSET_UNUSED = 0xFFFFFFFF,
	OSD_OFFSET_MAX_BITS = 28,

	OSDv1_OFFSET_MIN_SHIFT = 8,
	OSD_OFFSET_MIN_SHIFT = 3,
	OSD_OFFSET_MAX_SHIFT = 16,
};

/* Return the smallest allowed encoded offset that contains @offset.
 *
 * The actual encoded offset returned is @offset + *padding.
 * (up to max_shift, non-inclusive)
 */
osd_cdb_offset __osd_encode_offset(u64 offset, unsigned *padding,
	int min_shift, int max_shift);

/* Minimum alignment is 256 bytes
 * Note: Seems from std v1 that exponent can be from 0+8 to 0xE+8 (inclusive)
 * which is 8 to 23 but IBM code restricts it to 16, so be it.
 */
static inline osd_cdb_offset osd_encode_offset_v1(u64 offset, unsigned *padding)
{
	return __osd_encode_offset(offset, padding,
				OSDv1_OFFSET_MIN_SHIFT, OSD_OFFSET_MAX_SHIFT);
}

/* Minimum 8 bytes alignment
 * Same as v1 but since exponent can be signed than a less than
 * 256 alignment can be reached with small offsets (<2GB)
 */
static inline osd_cdb_offset osd_encode_offset_v2(u64 offset, unsigned *padding)
{
	return __osd_encode_offset(offset, padding,
				   OSD_OFFSET_MIN_SHIFT, OSD_OFFSET_MAX_SHIFT);
}

/* osd2r03: 5.2.1 Overview */
struct osd_cdb_head {
	struct scsi_varlen_cdb_hdr varlen_cdb;
/*10*/	u8		options;
	u8		command_specific_options;
	u8		timestamp_control;
/*13*/	u8		reserved1[3];
/*16*/	__be64		partition;
/*24*/	__be64		object;
/*32*/	union { /* V1 vs V2 alignment differences */
		struct __osdv1_cdb_addr_len {
/*32*/			__be32 		list_identifier;/* Rarely used */
/*36*/			__be64		length;
/*44*/			__be64		start_address;
		} __packed v1;

		struct __osdv2_cdb_addr_len {
			/* called allocation_length in some commands */
/*32*/			__be64	length;
/*40*/			__be64	start_address;
			union {
/*48*/				__be32 list_identifier;/* Rarely used */
				/* OSD2r05 5.2.5 CDB continuation length */
/*48*/				__be32 cdb_continuation_length;
			};
		} __packed v2;
	};
/*52*/	union { /* selected attributes mode Page/List/Single */
		struct osd_attributes_page_mode {
/*52*/			__be32		get_attr_page;
/*56*/			__be32		get_attr_alloc_length;
/*60*/			osd_cdb_offset	get_attr_offset;

/*64*/			__be32		set_attr_page;
/*68*/			__be32		set_attr_id;
/*72*/			__be32		set_attr_length;
/*76*/			osd_cdb_offset	set_attr_offset;
/*80*/		} __packed attrs_page;

		struct osd_attributes_list_mode {
/*52*/			__be32		get_attr_desc_bytes;
/*56*/			osd_cdb_offset	get_attr_desc_offset;

/*60*/			__be32		get_attr_alloc_length;
/*64*/			osd_cdb_offset	get_attr_offset;

/*68*/			__be32		set_attr_bytes;
/*72*/			osd_cdb_offset	set_attr_offset;
			__be32 not_used;
/*80*/		} __packed attrs_list;

		/* osd2r03:5.2.4.2 Set one attribute value using CDB fields */
		struct osd_attributes_cdb_mode {
/*52*/			__be32		set_attr_page;
/*56*/			__be32		set_attr_id;
/*60*/			__be16		set_attr_len;
/*62*/			u8		set_attr_val[18];
/*80*/		} __packed attrs_cdb;
/*52*/		u8 get_set_attributes_parameters[28];
	};
} __packed;
/*80*/

/*160 v1*/
struct osdv1_security_parameters {
/*160*/u8	integrity_check_value[OSDv1_CRYPTO_KEYID_SIZE];
/*180*/u8	request_nonce[OSD_CRYPTO_NONCE_SIZE];
/*192*/osd_cdb_offset	data_in_integrity_check_offset;
/*196*/osd_cdb_offset	data_out_integrity_check_offset;
} __packed;
/*200 v1*/

/*184 v2*/
struct osdv2_security_parameters {
/*184*/u8	integrity_check_value[OSDv2_CRYPTO_KEYID_SIZE];
/*216*/u8	request_nonce[OSD_CRYPTO_NONCE_SIZE];
/*228*/osd_cdb_offset	data_in_integrity_check_offset;
/*232*/osd_cdb_offset	data_out_integrity_check_offset;
} __packed;
/*236 v2*/

struct osd_security_parameters {
	union {
		struct osdv1_security_parameters v1;
		struct osdv2_security_parameters v2;
	};
};

struct osdv1_cdb {
	struct osd_cdb_head h;
	u8 caps[OSDv1_CAP_LEN];
	struct osdv1_security_parameters sec_params;
} __packed;

struct osdv2_cdb {
	struct osd_cdb_head h;
	u8 caps[OSD_CAP_LEN];
	struct osdv2_security_parameters sec_params;
} __packed;

struct osd_cdb {
	union {
		struct osdv1_cdb v1;
		struct osdv2_cdb v2;
		u8 buff[OSD_TOTAL_CDB_LEN];
	};
} __packed;

static inline struct osd_cdb_head *osd_cdb_head(struct osd_cdb *ocdb)
{
	return (struct osd_cdb_head *)ocdb->buff;
}

/* define both version actions
 * Ex name = FORMAT_OSD we have OSD_ACT_FORMAT_OSD && OSDv1_ACT_FORMAT_OSD
 */
#define OSD_ACT___(Name, Num) \
	OSD_ACT_##Name = cpu_to_be16(0x8880 + Num), \
	OSDv1_ACT_##Name = cpu_to_be16(0x8800 + Num),

/* V2 only actions */
#define OSD_ACT_V2(Name, Num) \
	OSD_ACT_##Name = cpu_to_be16(0x8880 + Num),

#define OSD_ACT_V1_V2(Name, Num1, Num2) \
	OSD_ACT_##Name = cpu_to_be16(Num2), \
	OSDv1_ACT_##Name = cpu_to_be16(Num1),

enum osd_service_actions {
	OSD_ACT_V2(OBJECT_STRUCTURE_CHECK,	0x00)
	OSD_ACT___(FORMAT_OSD,			0x01)
	OSD_ACT___(CREATE,			0x02)
	OSD_ACT___(LIST,			0x03)
	OSD_ACT_V2(PUNCH,			0x04)
	OSD_ACT___(READ,			0x05)
	OSD_ACT___(WRITE,			0x06)
	OSD_ACT___(APPEND,			0x07)
	OSD_ACT___(FLUSH,			0x08)
	OSD_ACT_V2(CLEAR,			0x09)
	OSD_ACT_