Tgtd illustration

Nov 7, 20111 like4,288 views

This document illustrates the general architecture and data flow of tgtd, the iSCSI target daemon. It shows how tgtd handles iSCSI requests from initiators and processes SCSI commands by communicating with low-level driver routines and backing storage devices like mmc, osd, and sbc. Management tasks like login, logout, and error handling are also depicted.

tgtd illustration
based on https://github.com/fujita/tgt

Tuesday, November 8, 11 1

General Arch
epoll iSCSI, iSER, bst: aio, rdwr,
FCoE, etc. null, sg, ssc

low level backing
initiator
drivers con stores
n
R &W
target
mmc, osd,
Core sbc, scc, smc,
ssc
lu SC
a sk SI
mt
spc &
tgtadm mgmt
devices
utils,
common

Tuesday, November 8, 11 2

Mgmt Routine
If req Len>
tgtadm_req tgt_mgmt
tgtadm send
commands here mtask_handler
HDR_RECV sys_mgmt
PDU_RECV
target_mgmt

IPC: mgmt_task portal_mgmt

device_mgmt
mtask_handler
RSP_SEND account_mgmt

connection_mgmt

Tuesday, November 8, 11 3

State Transition of Conn
Security Security
Security auth Done

Free Security
login

Security
Login Login full
full
Only for iSER

Init
Start
Full Kernel
Ready Network Error

Proto Error Logout
Exit Close Scsi

Tuesday, November 8, 11 4

Cmd rx in iscsid 1
Immediate:
OpXX iscsi_task_queue iscsi_task_ececute
Other:
OP_DATA_OUT expected SNs:
iscsi_task_execute
Others:
iscsi_task_ececute
Add to pending list
NOOP_OUT/LOGOUT:
Set EPOLLIN|EPOLLOUT queue:

SCSI_CMD: target_cmd_queue
... target.c
iscsi_scsi_cmd_execute all:

SCSI_TMFUNC:
Set EPOLLIN|EPOLLOUT
iscsi_tm_execute target_mgmt_request
... target.c

Tuesday, November 8, 11 5

Cmd rx in iscsid 2
OpXX

OP_DATA_OUT iscsi_data_out_rx_done

Do nothing

FINAL && not pending:
iscsi_scsi_cmd_execute
... as in prev page

Tuesday, November 8, 11 6

SCSI Cmd Processing In target.c, scsi.c, & devs

cmd_perform ==

scsi_cmd_perfor

scsi_cmd_queued
Processed later

dev_type_template.ops[op]. cmd_perfor

sbc_rw, sbc_sync_cache BS

Others processed in sbc.c or spc.c

Tuesday, November 8, 11 7

Backing Storage
bs_init bs_thread_info follows lu

Create LU

bs_open pathname, fd, size

Dev request bs_cmd_submit(cmd)

Destroy LU bs_close, bs_exit

Tuesday, November 8, 11 8

That's All.
Thanks!

Tuesday, November 8, 11 9

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