linux-stable/include/scsi/scsi_tgt_if.h
FUJITA Tomonori 930e99bd13 [SCSI] tgt: fix the user/kernel ring buffer interface
This patches fixes two bugs in the scsi target infrastructure's
user/kernel interface.

- It wrongly assumes that the ring buffer size of the interface (64KB)
is larger than or equal to the system page size. This patch sets the
ring buffer size to PAGE_SIZE if the system page size is larger.

- It uses PAGE_SIZE in the header file exported to userspace. This
patch removes it.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-02-16 09:40:56 -06:00

87 lines
2 KiB
C

/*
* SCSI target kernel/user interface
*
* Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
* Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef __SCSI_TARGET_IF_H
#define __SCSI_TARGET_IF_H
/* user -> kernel */
#define TGT_UEVENT_CMD_RSP 0x0001
#define TGT_UEVENT_TSK_MGMT_RSP 0x0002
/* kernel -> user */
#define TGT_KEVENT_CMD_REQ 0x1001
#define TGT_KEVENT_CMD_DONE 0x1002
#define TGT_KEVENT_TSK_MGMT_REQ 0x1003
struct tgt_event_hdr {
uint16_t version;
uint16_t status;
uint16_t type;
uint16_t len;
} __attribute__ ((aligned (sizeof(uint64_t))));
struct tgt_event {
struct tgt_event_hdr hdr;
union {
/* user-> kernel */
struct {
int host_no;
uint32_t len;
int result;
aligned_u64 uaddr;
uint8_t rw;
aligned_u64 tag;
} cmd_rsp;
struct {
int host_no;
aligned_u64 mid;
int result;
} tsk_mgmt_rsp;
/* kernel -> user */
struct {
int host_no;
uint32_t data_len;
uint8_t scb[16];
uint8_t lun[8];
int attribute;
aligned_u64 tag;
} cmd_req;
struct {
int host_no;
aligned_u64 tag;
int result;
} cmd_done;
struct {
int host_no;
int function;
aligned_u64 tag;
uint8_t lun[8];
aligned_u64 mid;
} tsk_mgmt_req;
} p;
} __attribute__ ((aligned (sizeof(uint64_t))));
#define TGT_RING_SIZE (1UL << 16)
#endif