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>
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* SCSI target kernel/user interface
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*
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* Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
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* Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifndef __SCSI_TARGET_IF_H
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#define __SCSI_TARGET_IF_H
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/* user -> kernel */
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#define TGT_UEVENT_CMD_RSP 0x0001
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#define TGT_UEVENT_IT_NEXUS_RSP 0x0002
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#define TGT_UEVENT_TSK_MGMT_RSP 0x0003
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/* kernel -> user */
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#define TGT_KEVENT_CMD_REQ 0x1001
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#define TGT_KEVENT_CMD_DONE 0x1002
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#define TGT_KEVENT_IT_NEXUS_REQ 0x1003
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#define TGT_KEVENT_TSK_MGMT_REQ 0x1004
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struct tgt_event_hdr {
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uint16_t version;
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uint16_t status;
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uint16_t type;
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uint16_t len;
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} __attribute__ ((aligned (sizeof(uint64_t))));
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struct tgt_event {
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struct tgt_event_hdr hdr;
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union {
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/* user-> kernel */
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struct {
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int host_no;
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int result;
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aligned_u64 itn_id;
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aligned_u64 tag;
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aligned_u64 uaddr;
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aligned_u64 sense_uaddr;
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uint32_t len;
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uint32_t sense_len;
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uint8_t rw;
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} cmd_rsp;
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struct {
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int host_no;
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int result;
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aligned_u64 itn_id;
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aligned_u64 mid;
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} tsk_mgmt_rsp;
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struct {
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__s32 host_no;
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__s32 result;
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aligned_u64 itn_id;
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__u32 function;
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} it_nexus_rsp;
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/* kernel -> user */
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struct {
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int host_no;
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uint32_t data_len;
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aligned_u64 itn_id;
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uint8_t scb[16];
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uint8_t lun[8];
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int attribute;
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aligned_u64 tag;
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} cmd_req;
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struct {
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int host_no;
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int result;
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aligned_u64 itn_id;
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aligned_u64 tag;
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} cmd_done;
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struct {
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int host_no;
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int function;
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aligned_u64 itn_id;
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aligned_u64 tag;
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uint8_t lun[8];
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aligned_u64 mid;
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} tsk_mgmt_req;
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struct {
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__s32 host_no;
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__u32 function;
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aligned_u64 itn_id;
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__u32 max_cmds;
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__u8 initiator_id[16];
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} it_nexus_req;
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} p;
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} __attribute__ ((aligned (sizeof(uint64_t))));
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#define TGT_RING_SIZE (1UL << 16)
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#endif
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