mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-19 16:14:13 +08:00
2c47f9efbe
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it creates one scsi_host for one initiator. However, other target drivers don't work like that. This adds I_T nexus support, which enable one scsi_host to handle multiple initiators. New scsi_tgt_it_nexus_create/destroy functions are expected be called transport classes. For example, ibmvstgt creates an initiator remote port, then the srp transport calls tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells tgtd, user-space daemon, to create a new I_T nexus. On the receiving the response from tgtd, tgt calls shost->transportt->it_nexus_response. transports should notify a lld. The srp transport uses it_nexus_response callback in srp_function_template to do that. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
109 lines
2.5 KiB
C
109 lines
2.5 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_IT_NEXUS_RSP 0x0002
|
|
#define TGT_UEVENT_TSK_MGMT_RSP 0x0003
|
|
|
|
/* kernel -> user */
|
|
#define TGT_KEVENT_CMD_REQ 0x1001
|
|
#define TGT_KEVENT_CMD_DONE 0x1002
|
|
#define TGT_KEVENT_IT_NEXUS_REQ 0x1003
|
|
#define TGT_KEVENT_TSK_MGMT_REQ 0x1004
|
|
|
|
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;
|
|
int result;
|
|
aligned_u64 itn_id;
|
|
aligned_u64 tag;
|
|
aligned_u64 uaddr;
|
|
aligned_u64 sense_uaddr;
|
|
uint32_t len;
|
|
uint32_t sense_len;
|
|
uint8_t rw;
|
|
} cmd_rsp;
|
|
struct {
|
|
int host_no;
|
|
int result;
|
|
aligned_u64 itn_id;
|
|
aligned_u64 mid;
|
|
} tsk_mgmt_rsp;
|
|
struct {
|
|
__s32 host_no;
|
|
__s32 result;
|
|
aligned_u64 itn_id;
|
|
__u32 function;
|
|
} it_nexus_rsp;
|
|
|
|
/* kernel -> user */
|
|
struct {
|
|
int host_no;
|
|
uint32_t data_len;
|
|
aligned_u64 itn_id;
|
|
uint8_t scb[16];
|
|
uint8_t lun[8];
|
|
int attribute;
|
|
aligned_u64 tag;
|
|
} cmd_req;
|
|
struct {
|
|
int host_no;
|
|
int result;
|
|
aligned_u64 itn_id;
|
|
aligned_u64 tag;
|
|
} cmd_done;
|
|
struct {
|
|
int host_no;
|
|
int function;
|
|
aligned_u64 itn_id;
|
|
aligned_u64 tag;
|
|
uint8_t lun[8];
|
|
aligned_u64 mid;
|
|
} tsk_mgmt_req;
|
|
struct {
|
|
__s32 host_no;
|
|
__u32 function;
|
|
aligned_u64 itn_id;
|
|
__u32 max_cmds;
|
|
__u8 initiator_id[16];
|
|
} it_nexus_req;
|
|
} p;
|
|
} __attribute__ ((aligned (sizeof(uint64_t))));
|
|
|
|
#define TGT_RING_SIZE (1UL << 16)
|
|
|
|
#endif
|